Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
26296c48 | 4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
fac6795d | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
91d76f53 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
fac6795d DG |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
0bb7724a | 24 | #include <paths.h> |
fac6795d DG |
25 | #include <pthread.h> |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
331744e3 | 30 | #include <inttypes.h> |
0fdd1e2c | 31 | #include <sys/mman.h> |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
0fdd1e2c | 37 | #include <sys/wait.h> |
5c827ce0 | 38 | #include <urcu/uatomic.h> |
fac6795d | 39 | #include <unistd.h> |
4f0b90ee | 40 | #include <ctype.h> |
fac6795d | 41 | |
990570ed | 42 | #include <common/common.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
e8fa9fb0 | 44 | #include <common/compat/getenv.h> |
db758600 DG |
45 | #include <common/defaults.h> |
46 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 47 | #include <common/futex.h> |
00e2e675 | 48 | #include <common/relayd/relayd.h> |
81b86775 | 49 | #include <common/utils.h> |
3ccdf997 | 50 | #include <common/daemonize.h> |
f40ef1d5 | 51 | #include <common/config/session-config.h> |
c92af2a5 | 52 | #include <common/dynamic-buffer.h> |
fac6795d | 53 | |
10a8a223 | 54 | #include "lttng-sessiond.h" |
7972aab2 | 55 | #include "buffer-registry.h" |
54d01ffb | 56 | #include "channel.h" |
2f77fc4b | 57 | #include "cmd.h" |
00e2e675 | 58 | #include "consumer.h" |
099e26bd | 59 | #include "context.h" |
54d01ffb | 60 | #include "event.h" |
4771f025 | 61 | #include "kernel.h" |
f1e16794 | 62 | #include "kernel-consumer.h" |
096102bd | 63 | #include "modprobe.h" |
0fdd1e2c | 64 | #include "shm.h" |
1e307fab | 65 | #include "ust-ctl.h" |
00e2e675 | 66 | #include "ust-consumer.h" |
8e68d1c8 | 67 | #include "utils.h" |
4063050c | 68 | #include "fd-limit.h" |
8782cc74 | 69 | #include "health-sessiond.h" |
8ac94142 | 70 | #include "testpoint.h" |
d0b96690 | 71 | #include "ust-thread.h" |
022d91ba | 72 | #include "agent-thread.h" |
fb198a11 | 73 | #include "save.h" |
ef367a93 | 74 | #include "load-session-thread.h" |
834978fd | 75 | #include "syscall.h" |
7c1d2758 | 76 | #include "agent.h" |
5e97de00 | 77 | #include "ht-cleanup.h" |
fac6795d | 78 | |
ebaeda94 MD |
79 | #define CONSUMERD_FILE "lttng-consumerd" |
80 | ||
fac6795d | 81 | const char *progname; |
6c71277b | 82 | static const char *tracing_group_name = DEFAULT_TRACING_GROUP; |
26296c48 JG |
83 | static int tracing_group_name_override; |
84 | static char *opt_pidfile; | |
5b8719f5 | 85 | static int opt_sig_parent; |
97e19046 | 86 | static int opt_verbose_consumer; |
72dd7491 | 87 | static int opt_daemon, opt_background; |
4fba7219 | 88 | static int opt_no_kernel; |
ef367a93 | 89 | static char *opt_load_session_path; |
1d4b027a | 90 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
0bb7724a | 91 | static pid_t child_ppid; /* Internal parent PID use with daemonize. */ |
67e40797 | 92 | static char *rundir; |
c9cb3e7d | 93 | static int lockfile_fd = -1; |
8ff7624a | 94 | static int opt_print_version; |
3bd1e081 | 95 | |
0bb7724a DG |
96 | /* Set to 1 when a SIGUSR1 signal is received. */ |
97 | static int recv_child_signal; | |
98 | ||
a23ec3a7 DG |
99 | /* |
100 | * Consumer daemon specific control data. Every value not initialized here is | |
101 | * set to 0 by the static definition. | |
102 | */ | |
3bd1e081 MD |
103 | static struct consumer_data kconsumer_data = { |
104 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
105 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
106 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
107 | .err_sock = -1, |
108 | .cmd_sock = -1, | |
173af62f DG |
109 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
110 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
111 | .cond = PTHREAD_COND_INITIALIZER, |
112 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 113 | }; |
7753dea8 MD |
114 | static struct consumer_data ustconsumer64_data = { |
115 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
116 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
117 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
118 | .err_sock = -1, |
119 | .cmd_sock = -1, | |
173af62f DG |
120 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
121 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
122 | .cond = PTHREAD_COND_INITIALIZER, |
123 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
124 | }; |
125 | static struct consumer_data ustconsumer32_data = { | |
126 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
127 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
128 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
129 | .err_sock = -1, |
130 | .cmd_sock = -1, | |
173af62f DG |
131 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
132 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
133 | .cond = PTHREAD_COND_INITIALIZER, |
134 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
135 | }; |
136 | ||
26296c48 JG |
137 | /* Command line options */ |
138 | static const struct option long_options[] = { | |
0f5ea17c JG |
139 | { "client-sock", required_argument, 0, 'c' }, |
140 | { "apps-sock", required_argument, 0, 'a' }, | |
141 | { "kconsumerd-cmd-sock", required_argument, 0, '\0' }, | |
142 | { "kconsumerd-err-sock", required_argument, 0, '\0' }, | |
143 | { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' }, | |
144 | { "ustconsumerd32-err-sock", required_argument, 0, '\0' }, | |
145 | { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' }, | |
146 | { "ustconsumerd64-err-sock", required_argument, 0, '\0' }, | |
147 | { "consumerd32-path", required_argument, 0, '\0' }, | |
148 | { "consumerd32-libdir", required_argument, 0, '\0' }, | |
149 | { "consumerd64-path", required_argument, 0, '\0' }, | |
150 | { "consumerd64-libdir", required_argument, 0, '\0' }, | |
151 | { "daemonize", no_argument, 0, 'd' }, | |
152 | { "background", no_argument, 0, 'b' }, | |
153 | { "sig-parent", no_argument, 0, 'S' }, | |
154 | { "help", no_argument, 0, 'h' }, | |
155 | { "group", required_argument, 0, 'g' }, | |
156 | { "version", no_argument, 0, 'V' }, | |
157 | { "quiet", no_argument, 0, 'q' }, | |
158 | { "verbose", no_argument, 0, 'v' }, | |
159 | { "verbose-consumer", no_argument, 0, '\0' }, | |
160 | { "no-kernel", no_argument, 0, '\0' }, | |
161 | { "pidfile", required_argument, 0, 'p' }, | |
162 | { "agent-tcp-port", required_argument, 0, '\0' }, | |
163 | { "config", required_argument, 0, 'f' }, | |
164 | { "load", required_argument, 0, 'l' }, | |
165 | { "kmod-probes", required_argument, 0, '\0' }, | |
166 | { "extra-kmod-probes", required_argument, 0, '\0' }, | |
26296c48 JG |
167 | { NULL, 0, 0, 0 } |
168 | }; | |
169 | ||
170 | /* Command line options to ignore from configuration file */ | |
171 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
172 | ||
26c9d55e | 173 | /* Shared between threads */ |
099e26bd | 174 | static int dispatch_thread_exit; |
fac6795d | 175 | |
54d01ffb DG |
176 | /* Global application Unix socket path */ |
177 | static char apps_unix_sock_path[PATH_MAX]; | |
178 | /* Global client Unix socket path */ | |
179 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
180 | /* global wait shm path for UST */ |
181 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
182 | /* Global health check unix path */ |
183 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 184 | |
1d4b027a | 185 | /* Sockets and FDs */ |
a4b35e07 MD |
186 | static int client_sock = -1; |
187 | static int apps_sock = -1; | |
2f77fc4b | 188 | int kernel_tracer_fd = -1; |
76d7553f | 189 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 190 | |
273ea72c DG |
191 | /* |
192 | * Quit pipe for all threads. This permits a single cancellation point | |
193 | * for all threads when receiving an event on the pipe. | |
194 | */ | |
76d7553f | 195 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 196 | |
099e26bd DG |
197 | /* |
198 | * This pipe is used to inform the thread managing application communication | |
199 | * that a command is queued and ready to be processed. | |
200 | */ | |
76d7553f | 201 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 202 | |
d0b96690 DG |
203 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
204 | ||
1d4b027a | 205 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 206 | static pthread_t apps_thread; |
d0b96690 | 207 | static pthread_t apps_notify_thread; |
099e26bd | 208 | static pthread_t reg_apps_thread; |
1d4b027a | 209 | static pthread_t client_thread; |
7a485870 | 210 | static pthread_t kernel_thread; |
099e26bd | 211 | static pthread_t dispatch_thread; |
44a5e5eb | 212 | static pthread_t health_thread; |
0b2dc8df | 213 | static pthread_t ht_cleanup_thread; |
022d91ba | 214 | static pthread_t agent_reg_thread; |
ef367a93 | 215 | static pthread_t load_session_thread; |
5eb91c98 | 216 | |
099e26bd DG |
217 | /* |
218 | * UST registration command queue. This queue is tied with a futex and uses a N | |
219 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
220 | * | |
b22c5da8 DG |
221 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
222 | * queue along with the wait/wake scheme. The thread_manage_apps receives down | |
223 | * the line new application socket and monitors it for any I/O error or clean | |
224 | * close that triggers an unregistration of the application. | |
099e26bd DG |
225 | */ |
226 | static struct ust_cmd_queue ust_cmd_queue; | |
227 | ||
b5541356 DG |
228 | /* |
229 | * Pointer initialized before thread creation. | |
230 | * | |
231 | * This points to the tracing session list containing the session count and a | |
232 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
233 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 234 | * |
d063d709 | 235 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 236 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
237 | */ |
238 | static struct ltt_session_list *session_list_ptr; | |
239 | ||
7753dea8 MD |
240 | int ust_consumerd64_fd = -1; |
241 | int ust_consumerd32_fd = -1; | |
242 | ||
fb6f1fa2 YB |
243 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
244 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
245 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
246 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
26296c48 JG |
247 | static int consumerd32_bin_override; |
248 | static int consumerd64_bin_override; | |
249 | static int consumerd32_libdir_override; | |
250 | static int consumerd64_libdir_override; | |
fb09408a | 251 | |
2f77fc4b DG |
252 | static const char *module_proc_lttng = "/proc/lttng"; |
253 | ||
5c827ce0 DG |
254 | /* |
255 | * Consumer daemon state which is changed when spawning it, killing it or in | |
256 | * case of a fatal error. | |
257 | */ | |
258 | enum consumerd_state { | |
259 | CONSUMER_STARTED = 1, | |
260 | CONSUMER_STOPPED = 2, | |
261 | CONSUMER_ERROR = 3, | |
262 | }; | |
263 | ||
264 | /* | |
265 | * This consumer daemon state is used to validate if a client command will be | |
266 | * able to reach the consumer. If not, the client is informed. For instance, | |
267 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
268 | * error to the client. | |
269 | * | |
270 | * The following example shows a possible race condition of this scheme: | |
271 | * | |
272 | * consumer thread error happens | |
273 | * client cmd arrives | |
274 | * client cmd checks state -> still OK | |
275 | * consumer thread exit, sets error | |
276 | * client cmd try to talk to consumer | |
277 | * ... | |
278 | * | |
279 | * However, since the consumer is a different daemon, we have no way of making | |
280 | * sure the command will reach it safely even with this state flag. This is why | |
281 | * we consider that up to the state validation during command processing, the | |
282 | * command is safe. After that, we can not guarantee the correctness of the | |
283 | * client request vis-a-vis the consumer. | |
284 | */ | |
285 | static enum consumerd_state ust_consumerd_state; | |
286 | static enum consumerd_state kernel_consumerd_state; | |
287 | ||
ae9e45b3 DG |
288 | /* |
289 | * Socket timeout for receiving and sending in seconds. | |
290 | */ | |
291 | static int app_socket_timeout; | |
292 | ||
12744796 DG |
293 | /* Set in main() with the current page size. */ |
294 | long page_size; | |
295 | ||
8782cc74 MD |
296 | /* Application health monitoring */ |
297 | struct health_app *health_sessiond; | |
298 | ||
022d91ba DG |
299 | /* Agent TCP port for registration. Used by the agent thread. */ |
300 | unsigned int agent_tcp_port = DEFAULT_AGENT_TCP_PORT; | |
4d076222 | 301 | |
f43f95a9 DG |
302 | /* Am I root or not. */ |
303 | int is_root; /* Set to 1 if the daemon is running as root */ | |
304 | ||
26296c48 JG |
305 | const char * const config_section_name = "sessiond"; |
306 | ||
ef367a93 JG |
307 | /* Load session thread information to operate. */ |
308 | struct load_session_thread_data *load_info; | |
309 | ||
7c1d2758 JG |
310 | /* Global hash tables */ |
311 | struct lttng_ht *agent_apps_ht_by_sock = NULL; | |
312 | ||
97bc1426 | 313 | /* |
f15331c0 JG |
314 | * The initialization of the session daemon is done in multiple phases. |
315 | * | |
316 | * While all threads are launched near-simultaneously, only some of them | |
317 | * are needed to ensure the session daemon can start to respond to client | |
318 | * requests. | |
319 | * | |
320 | * There are two important guarantees that we wish to offer with respect | |
321 | * to the initialisation of the session daemon: | |
322 | * - When the daemonize/background launcher process exits, the sessiond | |
323 | * is fully able to respond to client requests, | |
324 | * - Auto-loaded sessions are visible to clients. | |
325 | * | |
326 | * In order to achieve this, a number of support threads have to be launched | |
327 | * to allow the "client" thread to function properly. Moreover, since the | |
328 | * "load session" thread needs the client thread, we must provide a way | |
329 | * for the "load session" thread to know that the "client" thread is up | |
330 | * and running. | |
331 | * | |
332 | * Hence, the support threads decrement the lttng_sessiond_ready counter | |
333 | * while the "client" threads waits for it to reach 0. Once the "client" thread | |
334 | * unblocks, it posts the message_thread_ready semaphore which allows the | |
335 | * "load session" thread to progress. | |
336 | * | |
337 | * This implies that the "load session" thread is the last to be initialized | |
338 | * and will explicitly call sessiond_signal_parents(), which signals the parents | |
339 | * that the session daemon is fully initialized. | |
340 | * | |
341 | * The two (2) support threads are: | |
342 | * - agent_thread | |
343 | * - health_thread | |
97bc1426 | 344 | */ |
f15331c0 | 345 | int lttng_sessiond_ready = 2; |
97bc1426 | 346 | |
5e97de00 JG |
347 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
348 | { | |
349 | return (fd == thread_quit_pipe[0] && (events & LPOLLIN)) ? 1 : 0; | |
350 | } | |
351 | ||
97bc1426 | 352 | /* Notify parents that we are ready for cmd and health check */ |
ef367a93 | 353 | LTTNG_HIDDEN |
f15331c0 | 354 | void sessiond_signal_parents(void) |
97bc1426 | 355 | { |
f15331c0 JG |
356 | /* |
357 | * Notify parent pid that we are ready to accept command | |
358 | * for client side. This ppid is the one from the | |
359 | * external process that spawned us. | |
360 | */ | |
361 | if (opt_sig_parent) { | |
362 | kill(ppid, SIGUSR1); | |
363 | } | |
97bc1426 | 364 | |
f15331c0 JG |
365 | /* |
366 | * Notify the parent of the fork() process that we are | |
367 | * ready. | |
368 | */ | |
369 | if (opt_daemon || opt_background) { | |
370 | kill(child_ppid, SIGUSR1); | |
97bc1426 MD |
371 | } |
372 | } | |
373 | ||
f15331c0 JG |
374 | LTTNG_HIDDEN |
375 | void sessiond_notify_ready(void) | |
376 | { | |
377 | /* | |
378 | * The _return variant is used since the implied memory barriers are | |
379 | * required. | |
380 | */ | |
381 | (void) uatomic_sub_return(<tng_sessiond_ready, 1); | |
382 | } | |
383 | ||
fb09408a | 384 | static |
7753dea8 | 385 | void setup_consumerd_path(void) |
fb09408a | 386 | { |
fc7a59ce | 387 | const char *bin, *libdir; |
fb09408a | 388 | |
7753dea8 MD |
389 | /* |
390 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
391 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
392 | * has not been defined. | |
7753dea8 | 393 | */ |
ebaeda94 | 394 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
395 | if (!consumerd32_bin[0]) { |
396 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
397 | } |
398 | if (!consumerd32_libdir[0]) { | |
399 | consumerd32_libdir = INSTALL_LIB_PATH; | |
400 | } | |
401 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
402 | if (!consumerd64_bin[0]) { |
403 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 404 | } |
ebaeda94 MD |
405 | if (!consumerd64_libdir[0]) { |
406 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
407 | } |
408 | #else | |
409 | #error "Unknown bitness" | |
410 | #endif | |
411 | ||
fb09408a MD |
412 | /* |
413 | * runtime env. var. overrides the build default. | |
414 | */ | |
e8fa9fb0 | 415 | bin = lttng_secure_getenv("LTTNG_CONSUMERD32_BIN"); |
fc7a59ce AM |
416 | if (bin) { |
417 | consumerd32_bin = bin; | |
7753dea8 | 418 | } |
e8fa9fb0 | 419 | bin = lttng_secure_getenv("LTTNG_CONSUMERD64_BIN"); |
fc7a59ce AM |
420 | if (bin) { |
421 | consumerd64_bin = bin; | |
ebaeda94 | 422 | } |
e8fa9fb0 | 423 | libdir = lttng_secure_getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
424 | if (libdir) { |
425 | consumerd32_libdir = libdir; | |
426 | } | |
e8fa9fb0 | 427 | libdir = lttng_secure_getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
428 | if (libdir) { |
429 | consumerd64_libdir = libdir; | |
fb09408a MD |
430 | } |
431 | } | |
432 | ||
4a15001e MD |
433 | static |
434 | int __sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size, | |
435 | int *a_pipe) | |
5eb91c98 DG |
436 | { |
437 | int ret; | |
438 | ||
d0b96690 | 439 | assert(events); |
5eb91c98 DG |
440 | |
441 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
442 | if (ret < 0) { | |
443 | goto error; | |
444 | } | |
445 | ||
446 | /* Add quit pipe */ | |
4a15001e | 447 | ret = lttng_poll_add(events, a_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
448 | if (ret < 0) { |
449 | goto error; | |
450 | } | |
451 | ||
452 | return 0; | |
453 | ||
454 | error: | |
455 | return ret; | |
456 | } | |
457 | ||
4a15001e MD |
458 | /* |
459 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
460 | */ | |
461 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) | |
462 | { | |
463 | return __sessiond_set_thread_pollset(events, size, thread_quit_pipe); | |
464 | } | |
465 | ||
273ea72c | 466 | /* |
5eb91c98 | 467 | * Init thread quit pipe. |
273ea72c DG |
468 | * |
469 | * Return -1 on error or 0 if all pipes are created. | |
470 | */ | |
4a15001e | 471 | static int __init_thread_quit_pipe(int *a_pipe) |
273ea72c | 472 | { |
730389d9 | 473 | int ret, i; |
273ea72c | 474 | |
4a15001e | 475 | ret = pipe(a_pipe); |
273ea72c | 476 | if (ret < 0) { |
730389d9 | 477 | PERROR("thread quit pipe"); |
273ea72c DG |
478 | goto error; |
479 | } | |
480 | ||
730389d9 | 481 | for (i = 0; i < 2; i++) { |
4a15001e | 482 | ret = fcntl(a_pipe[i], F_SETFD, FD_CLOEXEC); |
730389d9 DG |
483 | if (ret < 0) { |
484 | PERROR("fcntl"); | |
485 | goto error; | |
486 | } | |
487 | } | |
488 | ||
273ea72c DG |
489 | error: |
490 | return ret; | |
491 | } | |
492 | ||
4a15001e MD |
493 | static int init_thread_quit_pipe(void) |
494 | { | |
495 | return __init_thread_quit_pipe(thread_quit_pipe); | |
496 | } | |
497 | ||
099e26bd DG |
498 | /* |
499 | * Stop all threads by closing the thread quit pipe. | |
500 | */ | |
cf3af59e MD |
501 | static void stop_threads(void) |
502 | { | |
5eb91c98 DG |
503 | int ret; |
504 | ||
cf3af59e MD |
505 | /* Stopping all threads */ |
506 | DBG("Terminating all threads"); | |
54d01ffb | 507 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
508 | if (ret < 0) { |
509 | ERR("write error on thread quit pipe"); | |
510 | } | |
511 | ||
099e26bd | 512 | /* Dispatch thread */ |
26c9d55e | 513 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 514 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
515 | } |
516 | ||
e975f9f8 DG |
517 | /* |
518 | * Close every consumer sockets. | |
519 | */ | |
520 | static void close_consumer_sockets(void) | |
521 | { | |
522 | int ret; | |
523 | ||
524 | if (kconsumer_data.err_sock >= 0) { | |
525 | ret = close(kconsumer_data.err_sock); | |
526 | if (ret < 0) { | |
527 | PERROR("kernel consumer err_sock close"); | |
528 | } | |
529 | } | |
530 | if (ustconsumer32_data.err_sock >= 0) { | |
531 | ret = close(ustconsumer32_data.err_sock); | |
532 | if (ret < 0) { | |
a76cbd9f | 533 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
534 | } |
535 | } | |
536 | if (ustconsumer64_data.err_sock >= 0) { | |
537 | ret = close(ustconsumer64_data.err_sock); | |
538 | if (ret < 0) { | |
a76cbd9f | 539 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
540 | } |
541 | } | |
542 | if (kconsumer_data.cmd_sock >= 0) { | |
543 | ret = close(kconsumer_data.cmd_sock); | |
544 | if (ret < 0) { | |
545 | PERROR("kernel consumer cmd_sock close"); | |
546 | } | |
547 | } | |
548 | if (ustconsumer32_data.cmd_sock >= 0) { | |
549 | ret = close(ustconsumer32_data.cmd_sock); | |
550 | if (ret < 0) { | |
a76cbd9f | 551 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
552 | } |
553 | } | |
554 | if (ustconsumer64_data.cmd_sock >= 0) { | |
555 | ret = close(ustconsumer64_data.cmd_sock); | |
556 | if (ret < 0) { | |
a76cbd9f | 557 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
558 | } |
559 | } | |
560 | } | |
561 | ||
c9cb3e7d JG |
562 | /* |
563 | * Generate the full lock file path using the rundir. | |
564 | * | |
565 | * Return the snprintf() return value thus a negative value is an error. | |
566 | */ | |
567 | static int generate_lock_file_path(char *path, size_t len) | |
568 | { | |
569 | int ret; | |
570 | ||
571 | assert(path); | |
572 | assert(rundir); | |
573 | ||
574 | /* Build lockfile path from rundir. */ | |
575 | ret = snprintf(path, len, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE, rundir); | |
576 | if (ret < 0) { | |
577 | PERROR("snprintf lockfile path"); | |
578 | } | |
579 | ||
580 | return ret; | |
581 | } | |
582 | ||
4e4714cb JR |
583 | /* |
584 | * Wait on consumer process termination. | |
585 | * | |
586 | * Need to be called with the consumer data lock held or from a context | |
587 | * ensuring no concurrent access to data (e.g: cleanup). | |
588 | */ | |
589 | static void wait_consumer(struct consumer_data *consumer_data) | |
590 | { | |
591 | pid_t ret; | |
592 | int status; | |
593 | ||
594 | if (consumer_data->pid <= 0) { | |
595 | return; | |
596 | } | |
597 | ||
598 | DBG("Waiting for complete teardown of consumerd (PID: %d)", | |
599 | consumer_data->pid); | |
600 | ret = waitpid(consumer_data->pid, &status, 0); | |
601 | if (ret == -1) { | |
602 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) | |
78f1416a | 603 | } else if (!WIFEXITED(status)) { |
4e4714cb JR |
604 | ERR("consumerd termination with error: %d", |
605 | WEXITSTATUS(ret)); | |
606 | } | |
607 | consumer_data->pid = 0; | |
608 | } | |
609 | ||
fac6795d | 610 | /* |
4a15001e | 611 | * Cleanup the session daemon's data structures. |
fac6795d | 612 | */ |
4a15001e | 613 | static void sessiond_cleanup(void) |
fac6795d | 614 | { |
ef599319 | 615 | int ret; |
af9737e9 | 616 | struct ltt_session *sess, *stmp; |
8c6c56c2 | 617 | char path[PATH_MAX]; |
fac6795d | 618 | |
4a15001e | 619 | DBG("Cleanup sessiond"); |
e07ae692 | 620 | |
4e449f3f MD |
621 | /* |
622 | * Close the thread quit pipe. It has already done its job, | |
623 | * since we are now called. | |
624 | */ | |
2f77fc4b DG |
625 | utils_close_pipe(thread_quit_pipe); |
626 | ||
35f90c40 DG |
627 | /* |
628 | * If opt_pidfile is undefined, the default file will be wiped when | |
629 | * removing the rundir. | |
630 | */ | |
631 | if (opt_pidfile) { | |
632 | ret = remove(opt_pidfile); | |
633 | if (ret < 0) { | |
634 | PERROR("remove pidfile %s", opt_pidfile); | |
635 | } | |
636 | } | |
637 | ||
8c6c56c2 MD |
638 | DBG("Removing sessiond and consumerd content of directory %s", rundir); |
639 | ||
640 | /* sessiond */ | |
641 | snprintf(path, PATH_MAX, | |
642 | "%s/%s", | |
643 | rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE); | |
644 | DBG("Removing %s", path); | |
645 | (void) unlink(path); | |
646 | ||
cd9290dd | 647 | snprintf(path, PATH_MAX, "%s/%s", rundir, |
022d91ba | 648 | DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE); |
cd9290dd DG |
649 | DBG("Removing %s", path); |
650 | (void) unlink(path); | |
651 | ||
8c6c56c2 MD |
652 | /* kconsumerd */ |
653 | snprintf(path, PATH_MAX, | |
654 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, | |
655 | rundir); | |
656 | DBG("Removing %s", path); | |
657 | (void) unlink(path); | |
658 | ||
659 | snprintf(path, PATH_MAX, | |
660 | DEFAULT_KCONSUMERD_PATH, | |
661 | rundir); | |
662 | DBG("Removing directory %s", path); | |
663 | (void) rmdir(path); | |
664 | ||
665 | /* ust consumerd 32 */ | |
666 | snprintf(path, PATH_MAX, | |
667 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, | |
668 | rundir); | |
669 | DBG("Removing %s", path); | |
670 | (void) unlink(path); | |
671 | ||
672 | snprintf(path, PATH_MAX, | |
673 | DEFAULT_USTCONSUMERD32_PATH, | |
674 | rundir); | |
675 | DBG("Removing directory %s", path); | |
676 | (void) rmdir(path); | |
677 | ||
678 | /* ust consumerd 64 */ | |
679 | snprintf(path, PATH_MAX, | |
680 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, | |
681 | rundir); | |
682 | DBG("Removing %s", path); | |
683 | (void) unlink(path); | |
684 | ||
685 | snprintf(path, PATH_MAX, | |
686 | DEFAULT_USTCONSUMERD64_PATH, | |
687 | rundir); | |
688 | DBG("Removing directory %s", path); | |
689 | (void) rmdir(path); | |
5461b305 | 690 | |
99bab54f | 691 | DBG("Cleaning up all sessions"); |
fac6795d | 692 | |
b5541356 | 693 | /* Destroy session list mutex */ |
273ea72c DG |
694 | if (session_list_ptr != NULL) { |
695 | pthread_mutex_destroy(&session_list_ptr->lock); | |
696 | ||
697 | /* Cleanup ALL session */ | |
54d01ffb DG |
698 | cds_list_for_each_entry_safe(sess, stmp, |
699 | &session_list_ptr->head, list) { | |
2f77fc4b | 700 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
701 | } |
702 | } | |
703 | ||
4e4714cb JR |
704 | wait_consumer(&kconsumer_data); |
705 | wait_consumer(&ustconsumer64_data); | |
706 | wait_consumer(&ustconsumer32_data); | |
707 | ||
6a4e4039 JG |
708 | DBG("Cleaning up all agent apps"); |
709 | agent_app_ht_clean(); | |
710 | ||
099e26bd | 711 | DBG("Closing all UST sockets"); |
56fff090 | 712 | ust_app_clean_list(); |
7972aab2 | 713 | buffer_reg_destroy_registries(); |
099e26bd | 714 | |
4fba7219 DG |
715 | if (is_root && !opt_no_kernel) { |
716 | DBG2("Closing kernel fd"); | |
a4b35e07 | 717 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
718 | ret = close(kernel_tracer_fd); |
719 | if (ret) { | |
720 | PERROR("close"); | |
721 | } | |
a4b35e07 | 722 | } |
2f50c8a3 | 723 | DBG("Unloading kernel modules"); |
096102bd | 724 | modprobe_remove_lttng_all(); |
834978fd | 725 | free(syscall_table); |
2f50c8a3 | 726 | } |
2f77fc4b | 727 | |
e975f9f8 DG |
728 | close_consumer_sockets(); |
729 | ||
ef367a93 JG |
730 | if (load_info) { |
731 | load_session_destroy_data(load_info); | |
732 | free(load_info); | |
733 | } | |
734 | ||
c9cb3e7d JG |
735 | /* |
736 | * Cleanup lock file by deleting it and finaly closing it which will | |
737 | * release the file system lock. | |
738 | */ | |
739 | if (lockfile_fd >= 0) { | |
740 | char lockfile_path[PATH_MAX]; | |
741 | ||
4a15001e MD |
742 | ret = generate_lock_file_path(lockfile_path, |
743 | sizeof(lockfile_path)); | |
c9cb3e7d JG |
744 | if (ret > 0) { |
745 | ret = remove(lockfile_path); | |
746 | if (ret < 0) { | |
747 | PERROR("remove lock file"); | |
748 | } | |
749 | ret = close(lockfile_fd); | |
750 | if (ret < 0) { | |
751 | PERROR("close lock file"); | |
752 | } | |
753 | } | |
754 | } | |
755 | ||
756 | /* | |
757 | * We do NOT rmdir rundir because there are other processes | |
758 | * using it, for instance lttng-relayd, which can start in | |
759 | * parallel with this teardown. | |
760 | */ | |
761 | ||
762 | free(rundir); | |
4a15001e MD |
763 | } |
764 | ||
765 | /* | |
766 | * Cleanup the daemon's option data structures. | |
767 | */ | |
768 | static void sessiond_cleanup_options(void) | |
769 | { | |
770 | DBG("Cleaning up options"); | |
771 | ||
772 | /* | |
773 | * If the override option is set, the pointer points to a *non* const | |
774 | * thus freeing it even though the variable type is set to const. | |
775 | */ | |
776 | if (tracing_group_name_override) { | |
777 | free((void *) tracing_group_name); | |
778 | } | |
779 | if (consumerd32_bin_override) { | |
780 | free((void *) consumerd32_bin); | |
781 | } | |
782 | if (consumerd64_bin_override) { | |
783 | free((void *) consumerd64_bin); | |
784 | } | |
785 | if (consumerd32_libdir_override) { | |
786 | free((void *) consumerd32_libdir); | |
787 | } | |
788 | if (consumerd64_libdir_override) { | |
789 | free((void *) consumerd64_libdir); | |
790 | } | |
791 | ||
792 | free(opt_pidfile); | |
793 | free(opt_load_session_path); | |
794 | free(kmod_probes_list); | |
795 | free(kmod_extra_probes_list); | |
c9cb3e7d | 796 | |
7567352f | 797 | run_as_destroy_worker(); |
fac6795d DG |
798 | } |
799 | ||
e065084a | 800 | /* |
d063d709 | 801 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 802 | * |
d063d709 | 803 | * Return lttcomm error code. |
e065084a DG |
804 | */ |
805 | static int send_unix_sock(int sock, void *buf, size_t len) | |
806 | { | |
807 | /* Check valid length */ | |
c617c0c6 | 808 | if (len == 0) { |
e065084a DG |
809 | return -1; |
810 | } | |
811 | ||
812 | return lttcomm_send_unix_sock(sock, buf, len); | |
813 | } | |
814 | ||
5461b305 | 815 | /* |
d063d709 | 816 | * Free memory of a command context structure. |
5461b305 | 817 | */ |
a2fb29a5 | 818 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 819 | { |
a2fb29a5 DG |
820 | DBG("Clean command context structure"); |
821 | if (*cmd_ctx) { | |
822 | if ((*cmd_ctx)->llm) { | |
823 | free((*cmd_ctx)->llm); | |
5461b305 | 824 | } |
a2fb29a5 DG |
825 | if ((*cmd_ctx)->lsm) { |
826 | free((*cmd_ctx)->lsm); | |
5461b305 | 827 | } |
a2fb29a5 DG |
828 | free(*cmd_ctx); |
829 | *cmd_ctx = NULL; | |
5461b305 DG |
830 | } |
831 | } | |
832 | ||
fac6795d | 833 | /* |
0fdd1e2c | 834 | * Notify UST applications using the shm mmap futex. |
fac6795d | 835 | */ |
0fdd1e2c | 836 | static int notify_ust_apps(int active) |
fac6795d | 837 | { |
0fdd1e2c | 838 | char *wait_shm_mmap; |
fac6795d | 839 | |
0fdd1e2c | 840 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 841 | |
0fdd1e2c DG |
842 | /* See shm.c for this call implying mmap, shm and futex calls */ |
843 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
844 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
845 | goto error; |
846 | } | |
847 | ||
0fdd1e2c DG |
848 | /* Wake waiting process */ |
849 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
850 | ||
851 | /* Apps notified successfully */ | |
852 | return 0; | |
fac6795d DG |
853 | |
854 | error: | |
0fdd1e2c | 855 | return -1; |
fac6795d DG |
856 | } |
857 | ||
e065084a | 858 | /* |
d063d709 DG |
859 | * Setup the outgoing data buffer for the response (llm) by allocating the |
860 | * right amount of memory and copying the original information from the lsm | |
861 | * structure. | |
ca95a216 | 862 | * |
6e10c9b9 | 863 | * Return 0 on success, negative value on error. |
ca95a216 | 864 | */ |
6e10c9b9 PP |
865 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
866 | const void *payload_buf, size_t payload_len, | |
867 | const void *cmd_header_buf, size_t cmd_header_len) | |
ca95a216 | 868 | { |
6e10c9b9 PP |
869 | int ret = 0; |
870 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
871 | const size_t cmd_header_offset = header_len; | |
872 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
873 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
ca95a216 | 874 | |
6e10c9b9 | 875 | cmd_ctx->llm = zmalloc(total_msg_size); |
5461b305 | 876 | |
5461b305 | 877 | if (cmd_ctx->llm == NULL) { |
76d7553f | 878 | PERROR("zmalloc"); |
5461b305 | 879 | ret = -ENOMEM; |
6e10c9b9 | 880 | goto end; |
ca95a216 DG |
881 | } |
882 | ||
5461b305 DG |
883 | /* Copy common data */ |
884 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 885 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
6e10c9b9 PP |
886 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
887 | cmd_ctx->llm->data_size = payload_len; | |
888 | cmd_ctx->lttng_msg_size = total_msg_size; | |
5461b305 | 889 | |
6e10c9b9 | 890 | /* Copy command header */ |
b4e3ceb9 PP |
891 | if (cmd_header_len) { |
892 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
893 | cmd_header_len); | |
894 | } | |
5461b305 | 895 | |
6e10c9b9 | 896 | /* Copy payload */ |
b4e3ceb9 PP |
897 | if (payload_len) { |
898 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
899 | payload_len); | |
900 | } | |
ca95a216 | 901 | |
6e10c9b9 | 902 | end: |
ca95a216 DG |
903 | return ret; |
904 | } | |
905 | ||
6e10c9b9 PP |
906 | /* |
907 | * Version of setup_lttng_msg() without command header. | |
908 | */ | |
909 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
910 | void *payload_buf, size_t payload_len) | |
911 | { | |
912 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
913 | } | |
7a485870 | 914 | /* |
5eb91c98 | 915 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 916 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 917 | */ |
5eb91c98 | 918 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 919 | { |
5eb91c98 | 920 | int ret; |
7a485870 DG |
921 | struct ltt_session *session; |
922 | struct ltt_kernel_channel *channel; | |
923 | ||
5eb91c98 | 924 | DBG("Updating kernel poll set"); |
7a485870 | 925 | |
54d01ffb | 926 | session_lock_list(); |
b5541356 | 927 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 928 | session_lock(session); |
7a485870 | 929 | if (session->kernel_session == NULL) { |
54d01ffb | 930 | session_unlock(session); |
7a485870 DG |
931 | continue; |
932 | } | |
7a485870 | 933 | |
54d01ffb DG |
934 | cds_list_for_each_entry(channel, |
935 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
936 | /* Add channel fd to the kernel poll set */ |
937 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
938 | if (ret < 0) { | |
54d01ffb | 939 | session_unlock(session); |
5eb91c98 DG |
940 | goto error; |
941 | } | |
942 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 943 | } |
54d01ffb | 944 | session_unlock(session); |
7a485870 | 945 | } |
54d01ffb | 946 | session_unlock_list(); |
7a485870 | 947 | |
5eb91c98 | 948 | return 0; |
7a485870 DG |
949 | |
950 | error: | |
54d01ffb | 951 | session_unlock_list(); |
7a485870 DG |
952 | return -1; |
953 | } | |
954 | ||
955 | /* | |
54d01ffb | 956 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 957 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 958 | * |
d063d709 | 959 | * Useful for CPU hotplug feature. |
7a485870 | 960 | */ |
2bdd86d4 | 961 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
962 | { |
963 | int ret = 0; | |
964 | struct ltt_session *session; | |
173af62f | 965 | struct ltt_kernel_session *ksess; |
7a485870 DG |
966 | struct ltt_kernel_channel *channel; |
967 | ||
968 | DBG("Updating kernel streams for channel fd %d", fd); | |
969 | ||
54d01ffb | 970 | session_lock_list(); |
b5541356 | 971 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 972 | session_lock(session); |
7a485870 | 973 | if (session->kernel_session == NULL) { |
54d01ffb | 974 | session_unlock(session); |
7a485870 DG |
975 | continue; |
976 | } | |
173af62f | 977 | ksess = session->kernel_session; |
d9800920 | 978 | |
4a15001e MD |
979 | cds_list_for_each_entry(channel, |
980 | &ksess->channel_list.head, list) { | |
981 | struct lttng_ht_iter iter; | |
982 | struct consumer_socket *socket; | |
d9800920 | 983 | |
4a15001e MD |
984 | if (channel->fd != fd) { |
985 | continue; | |
986 | } | |
987 | DBG("Channel found, updating kernel streams"); | |
988 | ret = kernel_open_channel_stream(channel); | |
989 | if (ret < 0) { | |
990 | goto error; | |
991 | } | |
992 | /* Update the stream global counter */ | |
993 | ksess->stream_count_global += ret; | |
994 | ||
995 | /* | |
996 | * Have we already sent fds to the consumer? If yes, it | |
997 | * means that tracing is started so it is safe to send | |
998 | * our updated stream fds. | |
999 | */ | |
1000 | if (ksess->consumer_fds_sent != 1 | |
1001 | || ksess->consumer == NULL) { | |
1002 | ret = -1; | |
1003 | goto error; | |
1004 | } | |
1005 | ||
1006 | rcu_read_lock(); | |
1007 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
1008 | &iter.iter, socket, node.node) { | |
1009 | pthread_mutex_lock(socket->lock); | |
1010 | ret = kernel_consumer_send_channel_stream(socket, | |
1011 | channel, ksess, | |
1012 | session->output_traces ? 1 : 0); | |
1013 | pthread_mutex_unlock(socket->lock); | |
1014 | if (ret < 0) { | |
e7fe706f | 1015 | rcu_read_unlock(); |
4a15001e | 1016 | goto error; |
7a485870 | 1017 | } |
7a485870 | 1018 | } |
4a15001e | 1019 | rcu_read_unlock(); |
7a485870 | 1020 | } |
54d01ffb | 1021 | session_unlock(session); |
7a485870 | 1022 | } |
54d01ffb | 1023 | session_unlock_list(); |
b3c750d2 | 1024 | return ret; |
7a485870 | 1025 | |
b3c750d2 | 1026 | error: |
54d01ffb DG |
1027 | session_unlock(session); |
1028 | session_unlock_list(); | |
7a485870 DG |
1029 | return ret; |
1030 | } | |
1031 | ||
487cf67c | 1032 | /* |
ffe60014 DG |
1033 | * For each tracing session, update newly registered apps. The session list |
1034 | * lock MUST be acquired before calling this. | |
487cf67c DG |
1035 | */ |
1036 | static void update_ust_app(int app_sock) | |
1037 | { | |
1038 | struct ltt_session *sess, *stmp; | |
1039 | ||
fdadac08 DG |
1040 | /* Consumer is in an ERROR state. Stop any application update. */ |
1041 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
1042 | /* Stop the update process since the consumer is dead. */ | |
1043 | return; | |
1044 | } | |
1045 | ||
487cf67c DG |
1046 | /* For all tracing session(s) */ |
1047 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
a9ad0c8f MD |
1048 | struct ust_app *app; |
1049 | ||
4ee14516 | 1050 | session_lock(sess); |
a9ad0c8f MD |
1051 | if (!sess->ust_session) { |
1052 | goto unlock_session; | |
1053 | } | |
1054 | ||
1055 | rcu_read_lock(); | |
1056 | assert(app_sock >= 0); | |
1057 | app = ust_app_find_by_sock(app_sock); | |
1058 | if (app == NULL) { | |
1059 | /* | |
1060 | * Application can be unregistered before so | |
1061 | * this is possible hence simply stopping the | |
1062 | * update. | |
1063 | */ | |
1064 | DBG3("UST app update failed to find app sock %d", | |
1065 | app_sock); | |
1066 | goto unlock_rcu; | |
421cb601 | 1067 | } |
a9ad0c8f MD |
1068 | ust_app_global_update(sess->ust_session, app); |
1069 | unlock_rcu: | |
1070 | rcu_read_unlock(); | |
1071 | unlock_session: | |
4ee14516 | 1072 | session_unlock(sess); |
487cf67c DG |
1073 | } |
1074 | } | |
1075 | ||
7a485870 | 1076 | /* |
d063d709 | 1077 | * This thread manage event coming from the kernel. |
7a485870 | 1078 | * |
d063d709 DG |
1079 | * Features supported in this thread: |
1080 | * -) CPU Hotplug | |
7a485870 DG |
1081 | */ |
1082 | static void *thread_manage_kernel(void *data) | |
1083 | { | |
139ac872 | 1084 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 1085 | uint32_t revents, nb_fd; |
7a485870 | 1086 | char tmp; |
5eb91c98 | 1087 | struct lttng_poll_event events; |
7a485870 | 1088 | |
6993eeb3 | 1089 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 1090 | |
6c71277b | 1091 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 1092 | |
d5d63bf1 DG |
1093 | /* |
1094 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 1095 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 1096 | */ |
6d737ce4 | 1097 | lttng_poll_init(&events); |
d5d63bf1 | 1098 | |
e547b070 | 1099 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
1100 | goto error_testpoint; |
1101 | } | |
8ac94142 | 1102 | |
840cb59c | 1103 | health_code_update(); |
44a5e5eb | 1104 | |
e547b070 | 1105 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 1106 | goto error_testpoint; |
6993eeb3 CB |
1107 | } |
1108 | ||
7a485870 | 1109 | while (1) { |
840cb59c | 1110 | health_code_update(); |
44a5e5eb | 1111 | |
7a485870 | 1112 | if (update_poll_flag == 1) { |
d21b0d71 DG |
1113 | /* Clean events object. We are about to populate it again. */ |
1114 | lttng_poll_clean(&events); | |
1115 | ||
d0b96690 | 1116 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
1117 | if (ret < 0) { |
1118 | goto error_poll_create; | |
1119 | } | |
1120 | ||
1121 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
1122 | if (ret < 0) { | |
1123 | goto error; | |
1124 | } | |
5f822d0a | 1125 | |
d21b0d71 | 1126 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
1127 | ret = update_kernel_poll(&events); |
1128 | if (ret < 0) { | |
7a485870 DG |
1129 | goto error; |
1130 | } | |
1131 | update_poll_flag = 0; | |
1132 | } | |
1133 | ||
7fa2082e | 1134 | DBG("Thread kernel polling"); |
7a485870 DG |
1135 | |
1136 | /* Poll infinite value of time */ | |
88f2b785 | 1137 | restart: |
a78af745 | 1138 | health_poll_entry(); |
5eb91c98 | 1139 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1140 | DBG("Thread kernel return from poll on %d fds", |
1141 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1142 | health_poll_exit(); |
7a485870 | 1143 | if (ret < 0) { |
88f2b785 MD |
1144 | /* |
1145 | * Restart interrupted system call. | |
1146 | */ | |
1147 | if (errno == EINTR) { | |
1148 | goto restart; | |
1149 | } | |
7a485870 DG |
1150 | goto error; |
1151 | } else if (ret == 0) { | |
1152 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
1153 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
1154 | "This should not have happened! Continuing..."); | |
7a485870 DG |
1155 | continue; |
1156 | } | |
1157 | ||
0d9c5d77 DG |
1158 | nb_fd = ret; |
1159 | ||
5eb91c98 DG |
1160 | for (i = 0; i < nb_fd; i++) { |
1161 | /* Fetch once the poll data */ | |
1162 | revents = LTTNG_POLL_GETEV(&events, i); | |
1163 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 1164 | |
840cb59c | 1165 | health_code_update(); |
44a5e5eb | 1166 | |
fd20dac9 MD |
1167 | if (!revents) { |
1168 | /* No activity for this FD (poll implementation). */ | |
1169 | continue; | |
1170 | } | |
1171 | ||
5eb91c98 | 1172 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1173 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1174 | if (ret) { |
139ac872 MD |
1175 | err = 0; |
1176 | goto exit; | |
5eb91c98 | 1177 | } |
7a485870 | 1178 | |
5eb91c98 | 1179 | /* Check for data on kernel pipe */ |
03e43155 MD |
1180 | if (revents & LPOLLIN) { |
1181 | if (pollfd == kernel_poll_pipe[0]) { | |
1182 | (void) lttng_read(kernel_poll_pipe[0], | |
1183 | &tmp, 1); | |
1184 | /* | |
1185 | * Ret value is useless here, if this pipe gets any actions an | |
1186 | * update is required anyway. | |
1187 | */ | |
1188 | update_poll_flag = 1; | |
1189 | continue; | |
1190 | } else { | |
1191 | /* | |
1192 | * New CPU detected by the kernel. Adding kernel stream to | |
1193 | * kernel session and updating the kernel consumer | |
1194 | */ | |
2bdd86d4 | 1195 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
1196 | if (ret < 0) { |
1197 | continue; | |
1198 | } | |
1199 | break; | |
7a485870 | 1200 | } |
03e43155 MD |
1201 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1202 | update_poll_flag = 1; | |
1203 | continue; | |
1204 | } else { | |
1205 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1206 | goto error; | |
7a485870 DG |
1207 | } |
1208 | } | |
1209 | } | |
1210 | ||
139ac872 | 1211 | exit: |
7a485870 | 1212 | error: |
5eb91c98 | 1213 | lttng_poll_clean(&events); |
76d7553f | 1214 | error_poll_create: |
6993eeb3 | 1215 | error_testpoint: |
6620da75 DG |
1216 | utils_close_pipe(kernel_poll_pipe); |
1217 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 1218 | if (err) { |
840cb59c | 1219 | health_error(); |
139ac872 | 1220 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
1221 | WARN("Kernel thread died unexpectedly. " |
1222 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 1223 | } |
8782cc74 | 1224 | health_unregister(health_sessiond); |
76d7553f | 1225 | DBG("Kernel thread dying"); |
7a485870 DG |
1226 | return NULL; |
1227 | } | |
1228 | ||
a23ec3a7 DG |
1229 | /* |
1230 | * Signal pthread condition of the consumer data that the thread. | |
1231 | */ | |
1232 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
1233 | { | |
1234 | pthread_mutex_lock(&data->cond_mutex); | |
1235 | ||
1236 | /* | |
1237 | * The state is set before signaling. It can be any value, it's the waiter | |
1238 | * job to correctly interpret this condition variable associated to the | |
1239 | * consumer pthread_cond. | |
1240 | * | |
1241 | * A value of 0 means that the corresponding thread of the consumer data | |
1242 | * was not started. 1 indicates that the thread has started and is ready | |
1243 | * for action. A negative value means that there was an error during the | |
1244 | * thread bootstrap. | |
1245 | */ | |
1246 | data->consumer_thread_is_ready = state; | |
1247 | (void) pthread_cond_signal(&data->cond); | |
1248 | ||
1249 | pthread_mutex_unlock(&data->cond_mutex); | |
1250 | } | |
1251 | ||
1d4b027a | 1252 | /* |
3bd1e081 | 1253 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 1254 | */ |
3bd1e081 | 1255 | static void *thread_manage_consumer(void *data) |
1d4b027a | 1256 | { |
42fc1d0b | 1257 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
5eb91c98 | 1258 | uint32_t revents, nb_fd; |
1d4b027a | 1259 | enum lttcomm_return_code code; |
5eb91c98 | 1260 | struct lttng_poll_event events; |
3bd1e081 | 1261 | struct consumer_data *consumer_data = data; |
1d4b027a | 1262 | |
3bd1e081 | 1263 | DBG("[thread] Manage consumer started"); |
1d4b027a | 1264 | |
34c1e15a MD |
1265 | rcu_register_thread(); |
1266 | rcu_thread_online(); | |
1267 | ||
6c71277b | 1268 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 1269 | |
855060f8 | 1270 | health_code_update(); |
9449cc75 | 1271 | |
5eb91c98 | 1272 | /* |
331744e3 JD |
1273 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
1274 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 1275 | */ |
331744e3 | 1276 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 1277 | if (ret < 0) { |
76d7553f | 1278 | goto error_poll; |
5eb91c98 | 1279 | } |
273ea72c | 1280 | |
edb8b045 DG |
1281 | /* |
1282 | * The error socket here is already in a listening state which was done | |
1283 | * just before spawning this thread to avoid a race between the consumer | |
1284 | * daemon exec trying to connect and the listen() call. | |
1285 | */ | |
3bd1e081 | 1286 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
1287 | if (ret < 0) { |
1288 | goto error; | |
1289 | } | |
1290 | ||
840cb59c | 1291 | health_code_update(); |
44a5e5eb | 1292 | |
331744e3 | 1293 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1294 | restart: |
a78af745 | 1295 | health_poll_entry(); |
8ac94142 | 1296 | |
e547b070 | 1297 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1298 | goto error; |
1299 | } | |
8ac94142 | 1300 | |
5eb91c98 | 1301 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1302 | health_poll_exit(); |
273ea72c | 1303 | if (ret < 0) { |
88f2b785 MD |
1304 | /* |
1305 | * Restart interrupted system call. | |
1306 | */ | |
1307 | if (errno == EINTR) { | |
1308 | goto restart; | |
1309 | } | |
273ea72c DG |
1310 | goto error; |
1311 | } | |
1312 | ||
0d9c5d77 DG |
1313 | nb_fd = ret; |
1314 | ||
5eb91c98 DG |
1315 | for (i = 0; i < nb_fd; i++) { |
1316 | /* Fetch once the poll data */ | |
1317 | revents = LTTNG_POLL_GETEV(&events, i); | |
1318 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1319 | ||
840cb59c | 1320 | health_code_update(); |
44a5e5eb | 1321 | |
fd20dac9 MD |
1322 | if (!revents) { |
1323 | /* No activity for this FD (poll implementation). */ | |
1324 | continue; | |
1325 | } | |
1326 | ||
5eb91c98 | 1327 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1328 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1329 | if (ret) { |
139ac872 MD |
1330 | err = 0; |
1331 | goto exit; | |
5eb91c98 DG |
1332 | } |
1333 | ||
1334 | /* Event on the registration socket */ | |
3bd1e081 | 1335 | if (pollfd == consumer_data->err_sock) { |
03e43155 MD |
1336 | if (revents & LPOLLIN) { |
1337 | continue; | |
1338 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1339 | ERR("consumer err socket poll error"); |
5eb91c98 | 1340 | goto error; |
03e43155 MD |
1341 | } else { |
1342 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1343 | goto error; | |
5eb91c98 DG |
1344 | } |
1345 | } | |
273ea72c DG |
1346 | } |
1347 | ||
3bd1e081 | 1348 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1349 | if (sock < 0) { |
1350 | goto error; | |
1351 | } | |
1352 | ||
b662582b DG |
1353 | /* |
1354 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1355 | * show must go on. | |
1356 | */ | |
1357 | (void) utils_set_fd_cloexec(sock); | |
1358 | ||
840cb59c | 1359 | health_code_update(); |
44a5e5eb | 1360 | |
3bd1e081 | 1361 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1362 | |
712ea556 | 1363 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1364 | ret = lttcomm_recv_unix_sock(sock, &code, |
1365 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1366 | if (ret <= 0) { |
1367 | goto error; | |
1368 | } | |
1369 | ||
840cb59c | 1370 | health_code_update(); |
f73fabfd | 1371 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1372 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1373 | consumer_data->cmd_sock = |
1374 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
4ce514c4 | 1375 | consumer_data->metadata_fd = |
331744e3 | 1376 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); |
92db7cdc DG |
1377 | if (consumer_data->cmd_sock < 0 |
1378 | || consumer_data->metadata_fd < 0) { | |
331744e3 | 1379 | PERROR("consumer connect cmd socket"); |
a23ec3a7 DG |
1380 | /* On error, signal condition and quit. */ |
1381 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1382 | goto error; |
1383 | } | |
9363801e | 1384 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; |
331744e3 JD |
1385 | /* Create metadata socket lock. */ |
1386 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1387 | if (consumer_data->metadata_sock.lock == NULL) { | |
1388 | PERROR("zmalloc pthread mutex"); | |
331744e3 JD |
1389 | goto error; |
1390 | } | |
1391 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1392 | ||
a23ec3a7 | 1393 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1394 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1395 | DBG("Consumer metadata socket ready (fd: %d)", | |
4ce514c4 | 1396 | consumer_data->metadata_fd); |
1d4b027a | 1397 | } else { |
3bd1e081 | 1398 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1399 | lttcomm_get_readable_code(-code)); |
1400 | goto error; | |
1401 | } | |
1402 | ||
331744e3 | 1403 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1404 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1405 | if (ret < 0) { |
72079cae DG |
1406 | goto error; |
1407 | } | |
1408 | ||
331744e3 | 1409 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1410 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1411 | if (ret < 0) { | |
72079cae | 1412 | goto error; |
5eb91c98 DG |
1413 | } |
1414 | ||
331744e3 | 1415 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1416 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1417 | LPOLLIN | LPOLLRDHUP); |
1418 | if (ret < 0) { | |
1419 | goto error; | |
1420 | } | |
1421 | ||
840cb59c | 1422 | health_code_update(); |
44a5e5eb | 1423 | |
331744e3 | 1424 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1425 | restart_poll: |
331744e3 | 1426 | while (1) { |
42fc1d0b DG |
1427 | health_code_update(); |
1428 | ||
1429 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
1430 | if (should_quit) { | |
1431 | /* Not a health error. */ | |
1432 | err = 0; | |
1433 | goto exit; | |
1434 | } | |
1435 | ||
331744e3 JD |
1436 | health_poll_entry(); |
1437 | ret = lttng_poll_wait(&events, -1); | |
1438 | health_poll_exit(); | |
1439 | if (ret < 0) { | |
1440 | /* | |
1441 | * Restart interrupted system call. | |
1442 | */ | |
1443 | if (errno == EINTR) { | |
1444 | goto restart_poll; | |
1445 | } | |
1446 | goto error; | |
88f2b785 | 1447 | } |
72079cae | 1448 | |
331744e3 | 1449 | nb_fd = ret; |
0d9c5d77 | 1450 | |
331744e3 JD |
1451 | for (i = 0; i < nb_fd; i++) { |
1452 | /* Fetch once the poll data */ | |
1453 | revents = LTTNG_POLL_GETEV(&events, i); | |
1454 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1455 | |
331744e3 | 1456 | health_code_update(); |
44a5e5eb | 1457 | |
fd20dac9 MD |
1458 | if (!revents) { |
1459 | /* No activity for this FD (poll implementation). */ | |
1460 | continue; | |
1461 | } | |
1462 | ||
42fc1d0b DG |
1463 | /* |
1464 | * Thread quit pipe has been triggered, flag that we should stop | |
1465 | * but continue the current loop to handle potential data from | |
1466 | * consumer. | |
1467 | */ | |
1468 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); | |
5eb91c98 | 1469 | |
331744e3 JD |
1470 | if (pollfd == sock) { |
1471 | /* Event on the consumerd socket */ | |
03e43155 MD |
1472 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1473 | && !(revents & LPOLLIN)) { | |
331744e3 JD |
1474 | ERR("consumer err socket second poll error"); |
1475 | goto error; | |
1476 | } | |
1477 | health_code_update(); | |
1478 | /* Wait for any kconsumerd error */ | |
1479 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1480 | sizeof(enum lttcomm_return_code)); | |
1481 | if (ret <= 0) { | |
1482 | ERR("consumer closed the command socket"); | |
1483 | goto error; | |
1484 | } | |
1485 | ||
1486 | ERR("consumer return code : %s", | |
1487 | lttcomm_get_readable_code(-code)); | |
1488 | ||
1489 | goto exit; | |
4ce514c4 | 1490 | } else if (pollfd == consumer_data->metadata_fd) { |
03e43155 MD |
1491 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1492 | && !(revents & LPOLLIN)) { | |
1493 | ERR("consumer err metadata socket second poll error"); | |
1494 | goto error; | |
1495 | } | |
331744e3 JD |
1496 | /* UST metadata requests */ |
1497 | ret = ust_consumer_metadata_request( | |
1498 | &consumer_data->metadata_sock); | |
1499 | if (ret < 0) { | |
1500 | ERR("Handling metadata request"); | |
1501 | goto error; | |
1502 | } | |
5eb91c98 | 1503 | } |
42fc1d0b | 1504 | /* No need for an else branch all FDs are tested prior. */ |
5eb91c98 | 1505 | } |
331744e3 | 1506 | health_code_update(); |
5eb91c98 DG |
1507 | } |
1508 | ||
139ac872 | 1509 | exit: |
1d4b027a | 1510 | error: |
fdadac08 DG |
1511 | /* |
1512 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1513 | * thread might be using them so get exclusive access which will abort all |
1514 | * other consumer command by other threads. | |
fdadac08 DG |
1515 | */ |
1516 | pthread_mutex_lock(&consumer_data->lock); | |
1517 | ||
5c827ce0 DG |
1518 | /* Immediately set the consumerd state to stopped */ |
1519 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1520 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1521 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1522 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1523 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1524 | } else { | |
1525 | /* Code flow error... */ | |
1526 | assert(0); | |
1527 | } | |
1528 | ||
76d7553f MD |
1529 | if (consumer_data->err_sock >= 0) { |
1530 | ret = close(consumer_data->err_sock); | |
1531 | if (ret) { | |
1532 | PERROR("close"); | |
1533 | } | |
a76cbd9f | 1534 | consumer_data->err_sock = -1; |
76d7553f MD |
1535 | } |
1536 | if (consumer_data->cmd_sock >= 0) { | |
1537 | ret = close(consumer_data->cmd_sock); | |
1538 | if (ret) { | |
1539 | PERROR("close"); | |
1540 | } | |
a76cbd9f | 1541 | consumer_data->cmd_sock = -1; |
76d7553f | 1542 | } |
96544455 SS |
1543 | if (consumer_data->metadata_sock.fd_ptr && |
1544 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1545 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1546 | if (ret) { |
1547 | PERROR("close"); | |
1548 | } | |
1549 | } | |
76d7553f MD |
1550 | if (sock >= 0) { |
1551 | ret = close(sock); | |
1552 | if (ret) { | |
1553 | PERROR("close"); | |
1554 | } | |
1555 | } | |
273ea72c | 1556 | |
3bd1e081 MD |
1557 | unlink(consumer_data->err_unix_sock_path); |
1558 | unlink(consumer_data->cmd_unix_sock_path); | |
fdadac08 | 1559 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1560 | |
fdadac08 | 1561 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1562 | if (consumer_data->metadata_sock.lock) { |
1563 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1564 | free(consumer_data->metadata_sock.lock); | |
1565 | } | |
5eb91c98 | 1566 | lttng_poll_clean(&events); |
76d7553f | 1567 | error_poll: |
139ac872 | 1568 | if (err) { |
840cb59c | 1569 | health_error(); |
139ac872 MD |
1570 | ERR("Health error occurred in %s", __func__); |
1571 | } | |
8782cc74 | 1572 | health_unregister(health_sessiond); |
76d7553f | 1573 | DBG("consumer thread cleanup completed"); |
0177d773 | 1574 | |
34c1e15a MD |
1575 | rcu_thread_offline(); |
1576 | rcu_unregister_thread(); | |
1577 | ||
5eb91c98 | 1578 | return NULL; |
099e26bd DG |
1579 | } |
1580 | ||
099e26bd DG |
1581 | /* |
1582 | * This thread manage application communication. | |
1d4b027a DG |
1583 | */ |
1584 | static void *thread_manage_apps(void *data) | |
099e26bd | 1585 | { |
139ac872 | 1586 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1587 | ssize_t size_ret; |
5eb91c98 | 1588 | uint32_t revents, nb_fd; |
5eb91c98 | 1589 | struct lttng_poll_event events; |
099e26bd DG |
1590 | |
1591 | DBG("[thread] Manage application started"); | |
1592 | ||
f6a9efaa DG |
1593 | rcu_register_thread(); |
1594 | rcu_thread_online(); | |
1595 | ||
6c71277b | 1596 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1597 | |
e547b070 | 1598 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1599 | goto error_testpoint; |
1600 | } | |
1601 | ||
840cb59c | 1602 | health_code_update(); |
44a5e5eb | 1603 | |
d0b96690 | 1604 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1605 | if (ret < 0) { |
76d7553f | 1606 | goto error_poll_create; |
5eb91c98 | 1607 | } |
099e26bd | 1608 | |
5eb91c98 DG |
1609 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1610 | if (ret < 0) { | |
1611 | goto error; | |
1612 | } | |
099e26bd | 1613 | |
e547b070 | 1614 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1615 | goto error; |
1616 | } | |
8ac94142 | 1617 | |
840cb59c | 1618 | health_code_update(); |
44a5e5eb | 1619 | |
5eb91c98 | 1620 | while (1) { |
7fa2082e | 1621 | DBG("Apps thread polling"); |
099e26bd DG |
1622 | |
1623 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1624 | restart: |
a78af745 | 1625 | health_poll_entry(); |
5eb91c98 | 1626 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1627 | DBG("Apps thread return from poll on %d fds", |
1628 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1629 | health_poll_exit(); |
099e26bd | 1630 | if (ret < 0) { |
88f2b785 MD |
1631 | /* |
1632 | * Restart interrupted system call. | |
1633 | */ | |
1634 | if (errno == EINTR) { | |
1635 | goto restart; | |
1636 | } | |
099e26bd DG |
1637 | goto error; |
1638 | } | |
1639 | ||
0d9c5d77 DG |
1640 | nb_fd = ret; |
1641 | ||
5eb91c98 DG |
1642 | for (i = 0; i < nb_fd; i++) { |
1643 | /* Fetch once the poll data */ | |
1644 | revents = LTTNG_POLL_GETEV(&events, i); | |
1645 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1646 | ||
840cb59c | 1647 | health_code_update(); |
44a5e5eb | 1648 | |
fd20dac9 MD |
1649 | if (!revents) { |
1650 | /* No activity for this FD (poll implementation). */ | |
1651 | continue; | |
1652 | } | |
1653 | ||
5eb91c98 | 1654 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1655 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1656 | if (ret) { |
139ac872 MD |
1657 | err = 0; |
1658 | goto exit; | |
5eb91c98 | 1659 | } |
099e26bd | 1660 | |
5eb91c98 DG |
1661 | /* Inspect the apps cmd pipe */ |
1662 | if (pollfd == apps_cmd_pipe[0]) { | |
03e43155 | 1663 | if (revents & LPOLLIN) { |
d0b96690 DG |
1664 | int sock; |
1665 | ||
5eb91c98 | 1666 | /* Empty pipe */ |
6cd525e8 MD |
1667 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1668 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1669 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1670 | goto error; |
1671 | } | |
099e26bd | 1672 | |
840cb59c | 1673 | health_code_update(); |
44a5e5eb | 1674 | |
ffe60014 | 1675 | /* |
03e43155 MD |
1676 | * Since this is a command socket (write then read), |
1677 | * we only monitor the error events of the socket. | |
ffe60014 | 1678 | */ |
d0b96690 DG |
1679 | ret = lttng_poll_add(&events, sock, |
1680 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1681 | if (ret < 0) { | |
5eb91c98 | 1682 | goto error; |
e0c7ec2b | 1683 | } |
acc7b41b | 1684 | |
d0b96690 | 1685 | DBG("Apps with sock %d added to poll set", sock); |
03e43155 MD |
1686 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1687 | ERR("Apps command pipe error"); | |
1688 | goto error; | |
1689 | } else { | |
1690 | ERR("Unknown poll events %u for sock %d", revents, pollfd); | |
1691 | goto error; | |
0177d773 | 1692 | } |
5eb91c98 DG |
1693 | } else { |
1694 | /* | |
54d01ffb DG |
1695 | * At this point, we know that a registered application made |
1696 | * the event at poll_wait. | |
5eb91c98 DG |
1697 | */ |
1698 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1699 | /* Removing from the poll set */ | |
1700 | ret = lttng_poll_del(&events, pollfd); | |
1701 | if (ret < 0) { | |
1702 | goto error; | |
1703 | } | |
099e26bd | 1704 | |
b9d9b220 | 1705 | /* Socket closed on remote end. */ |
56fff090 | 1706 | ust_app_unregister(pollfd); |
03e43155 MD |
1707 | } else { |
1708 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1709 | goto error; | |
5eb91c98 | 1710 | } |
099e26bd | 1711 | } |
44a5e5eb | 1712 | |
840cb59c | 1713 | health_code_update(); |
099e26bd | 1714 | } |
099e26bd DG |
1715 | } |
1716 | ||
139ac872 | 1717 | exit: |
099e26bd | 1718 | error: |
5eb91c98 | 1719 | lttng_poll_clean(&events); |
76d7553f | 1720 | error_poll_create: |
6993eeb3 | 1721 | error_testpoint: |
6620da75 DG |
1722 | utils_close_pipe(apps_cmd_pipe); |
1723 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1724 | ||
1725 | /* | |
1726 | * We don't clean the UST app hash table here since already registered | |
1727 | * applications can still be controlled so let them be until the session | |
1728 | * daemon dies or the applications stop. | |
1729 | */ | |
1730 | ||
139ac872 | 1731 | if (err) { |
840cb59c | 1732 | health_error(); |
139ac872 MD |
1733 | ERR("Health error occurred in %s", __func__); |
1734 | } | |
8782cc74 | 1735 | health_unregister(health_sessiond); |
76d7553f | 1736 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1737 | rcu_thread_offline(); |
1738 | rcu_unregister_thread(); | |
099e26bd DG |
1739 | return NULL; |
1740 | } | |
1741 | ||
d0b96690 | 1742 | /* |
d88aee68 DG |
1743 | * Send a socket to a thread This is called from the dispatch UST registration |
1744 | * thread once all sockets are set for the application. | |
d0b96690 | 1745 | * |
b85dc84c DG |
1746 | * The sock value can be invalid, we don't really care, the thread will handle |
1747 | * it and make the necessary cleanup if so. | |
1748 | * | |
d0b96690 DG |
1749 | * On success, return 0 else a negative value being the errno message of the |
1750 | * write(). | |
1751 | */ | |
d88aee68 | 1752 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1753 | { |
6cd525e8 | 1754 | ssize_t ret; |
d0b96690 | 1755 | |
b85dc84c DG |
1756 | /* |
1757 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1758 | * before calling this function being a shutdown state of the thread. | |
1759 | */ | |
1760 | if (fd < 0) { | |
1761 | ret = -EBADF; | |
1762 | goto error; | |
1763 | } | |
d0b96690 | 1764 | |
6cd525e8 MD |
1765 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1766 | if (ret < sizeof(sock)) { | |
d88aee68 | 1767 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1768 | if (ret < 0) { |
1769 | ret = -errno; | |
1770 | } | |
1771 | goto error; | |
1772 | } | |
1773 | ||
1774 | /* All good. Don't send back the write positive ret value. */ | |
1775 | ret = 0; | |
1776 | error: | |
6cd525e8 | 1777 | return (int) ret; |
d0b96690 DG |
1778 | } |
1779 | ||
f45e313d DG |
1780 | /* |
1781 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1782 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1783 | * notify socket is never received. | |
1784 | */ | |
1785 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1786 | { | |
1787 | int ret, nb_fd = 0, i; | |
1788 | unsigned int fd_added = 0; | |
1789 | struct lttng_poll_event events; | |
1790 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1791 | ||
1792 | assert(wait_queue); | |
1793 | ||
1794 | lttng_poll_init(&events); | |
1795 | ||
1796 | /* Just skip everything for an empty queue. */ | |
1797 | if (!wait_queue->count) { | |
1798 | goto end; | |
1799 | } | |
1800 | ||
1801 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1802 | if (ret < 0) { | |
1803 | goto error_create; | |
1804 | } | |
1805 | ||
1806 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1807 | &wait_queue->head, head) { | |
1808 | assert(wait_node->app); | |
1809 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1810 | LPOLLHUP | LPOLLERR); | |
1811 | if (ret < 0) { | |
1812 | goto error; | |
1813 | } | |
1814 | ||
1815 | fd_added = 1; | |
1816 | } | |
1817 | ||
1818 | if (!fd_added) { | |
1819 | goto end; | |
1820 | } | |
1821 | ||
1822 | /* | |
1823 | * Poll but don't block so we can quickly identify the faulty events and | |
1824 | * clean them afterwards from the wait queue. | |
1825 | */ | |
1826 | ret = lttng_poll_wait(&events, 0); | |
1827 | if (ret < 0) { | |
1828 | goto error; | |
1829 | } | |
1830 | nb_fd = ret; | |
1831 | ||
1832 | for (i = 0; i < nb_fd; i++) { | |
1833 | /* Get faulty FD. */ | |
1834 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1835 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1836 | ||
fd20dac9 MD |
1837 | if (!revents) { |
1838 | /* No activity for this FD (poll implementation). */ | |
1839 | continue; | |
1840 | } | |
1841 | ||
f45e313d DG |
1842 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1843 | &wait_queue->head, head) { | |
1844 | if (pollfd == wait_node->app->sock && | |
1845 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1846 | cds_list_del(&wait_node->head); | |
1847 | wait_queue->count--; | |
1848 | ust_app_destroy(wait_node->app); | |
1849 | free(wait_node); | |
48b40bcf JG |
1850 | /* |
1851 | * Silence warning of use-after-free in | |
1852 | * cds_list_for_each_entry_safe which uses | |
1853 | * __typeof__(*wait_node). | |
1854 | */ | |
1855 | wait_node = NULL; | |
f45e313d | 1856 | break; |
03e43155 MD |
1857 | } else { |
1858 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1859 | goto error; | |
f45e313d DG |
1860 | } |
1861 | } | |
1862 | } | |
1863 | ||
1864 | if (nb_fd > 0) { | |
1865 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1866 | } | |
1867 | ||
1868 | end: | |
1869 | lttng_poll_clean(&events); | |
1870 | return; | |
1871 | ||
1872 | error: | |
1873 | lttng_poll_clean(&events); | |
1874 | error_create: | |
1875 | ERR("Unable to sanitize wait queue"); | |
1876 | return; | |
1877 | } | |
1878 | ||
099e26bd DG |
1879 | /* |
1880 | * Dispatch request from the registration threads to the application | |
1881 | * communication thread. | |
1882 | */ | |
1883 | static void *thread_dispatch_ust_registration(void *data) | |
1884 | { | |
12e2b881 | 1885 | int ret, err = -1; |
8bdee6e2 | 1886 | struct cds_wfcq_node *node; |
099e26bd | 1887 | struct ust_command *ust_cmd = NULL; |
f45e313d DG |
1888 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1889 | struct ust_reg_wait_queue wait_queue = { | |
1890 | .count = 0, | |
1891 | }; | |
d0b96690 | 1892 | |
78d8cf23 MD |
1893 | rcu_register_thread(); |
1894 | ||
6c71277b | 1895 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1896 | |
9ad42ec1 MD |
1897 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1898 | goto error_testpoint; | |
1899 | } | |
1900 | ||
12e2b881 MD |
1901 | health_code_update(); |
1902 | ||
f45e313d | 1903 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1904 | |
1905 | DBG("[thread] Dispatch UST command started"); | |
1906 | ||
68924dc1 | 1907 | for (;;) { |
12e2b881 MD |
1908 | health_code_update(); |
1909 | ||
099e26bd DG |
1910 | /* Atomically prepare the queue futex */ |
1911 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1912 | ||
68924dc1 MD |
1913 | if (CMM_LOAD_SHARED(dispatch_thread_exit)) { |
1914 | break; | |
1915 | } | |
1916 | ||
099e26bd | 1917 | do { |
d0b96690 | 1918 | struct ust_app *app = NULL; |
7972aab2 | 1919 | ust_cmd = NULL; |
d0b96690 | 1920 | |
f45e313d DG |
1921 | /* |
1922 | * Make sure we don't have node(s) that have hung up before receiving | |
1923 | * the notify socket. This is to clean the list in order to avoid | |
1924 | * memory leaks from notify socket that are never seen. | |
1925 | */ | |
1926 | sanitize_wait_queue(&wait_queue); | |
1927 | ||
12e2b881 | 1928 | health_code_update(); |
099e26bd | 1929 | /* Dequeue command for registration */ |
8bdee6e2 | 1930 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 1931 | if (node == NULL) { |
00a17c97 | 1932 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1933 | /* Continue thread execution */ |
1934 | break; | |
1935 | } | |
1936 | ||
1937 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1938 | ||
2f50c8a3 DG |
1939 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1940 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1941 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1942 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1943 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1944 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1945 | |
1946 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1947 | wait_node = zmalloc(sizeof(*wait_node)); | |
1948 | if (!wait_node) { | |
1949 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1950 | ret = close(ust_cmd->sock); |
1951 | if (ret < 0) { | |
1952 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1953 | } | |
51dec90d | 1954 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1955 | free(ust_cmd); |
d0b96690 DG |
1956 | goto error; |
1957 | } | |
1958 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1959 | ||
1960 | /* Create application object if socket is CMD. */ | |
1961 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1962 | ust_cmd->sock); | |
1963 | if (!wait_node->app) { | |
1964 | ret = close(ust_cmd->sock); | |
1965 | if (ret < 0) { | |
1966 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1967 | } |
51dec90d | 1968 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1969 | free(wait_node); |
7972aab2 | 1970 | free(ust_cmd); |
d0b96690 DG |
1971 | continue; |
1972 | } | |
1973 | /* | |
1974 | * Add application to the wait queue so we can set the notify | |
1975 | * socket before putting this object in the global ht. | |
1976 | */ | |
f45e313d DG |
1977 | cds_list_add(&wait_node->head, &wait_queue.head); |
1978 | wait_queue.count++; | |
d0b96690 | 1979 | |
7972aab2 | 1980 | free(ust_cmd); |
d0b96690 DG |
1981 | /* |
1982 | * We have to continue here since we don't have the notify | |
1983 | * socket and the application MUST be added to the hash table | |
1984 | * only at that moment. | |
1985 | */ | |
1986 | continue; | |
1987 | } else { | |
1988 | /* | |
1989 | * Look for the application in the local wait queue and set the | |
1990 | * notify socket if found. | |
1991 | */ | |
d88aee68 | 1992 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1993 | &wait_queue.head, head) { |
12e2b881 | 1994 | health_code_update(); |
d0b96690 DG |
1995 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1996 | wait_node->app->notify_sock = ust_cmd->sock; | |
1997 | cds_list_del(&wait_node->head); | |
f45e313d | 1998 | wait_queue.count--; |
d0b96690 DG |
1999 | app = wait_node->app; |
2000 | free(wait_node); | |
2001 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
2002 | break; | |
2003 | } | |
2004 | } | |
020d7f60 DG |
2005 | |
2006 | /* | |
2007 | * With no application at this stage the received socket is | |
2008 | * basically useless so close it before we free the cmd data | |
2009 | * structure for good. | |
2010 | */ | |
2011 | if (!app) { | |
2012 | ret = close(ust_cmd->sock); | |
2013 | if (ret < 0) { | |
2014 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
2015 | } | |
51dec90d | 2016 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 2017 | } |
7972aab2 | 2018 | free(ust_cmd); |
d0b96690 DG |
2019 | } |
2020 | ||
2021 | if (app) { | |
d0b96690 DG |
2022 | /* |
2023 | * @session_lock_list | |
2024 | * | |
2025 | * Lock the global session list so from the register up to the | |
2026 | * registration done message, no thread can see the application | |
2027 | * and change its state. | |
2028 | */ | |
2029 | session_lock_list(); | |
2030 | rcu_read_lock(); | |
d88aee68 | 2031 | |
d0b96690 DG |
2032 | /* |
2033 | * Add application to the global hash table. This needs to be | |
2034 | * done before the update to the UST registry can locate the | |
2035 | * application. | |
2036 | */ | |
2037 | ust_app_add(app); | |
d88aee68 DG |
2038 | |
2039 | /* Set app version. This call will print an error if needed. */ | |
2040 | (void) ust_app_version(app); | |
2041 | ||
2042 | /* Send notify socket through the notify pipe. */ | |
2043 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
2044 | app->notify_sock); | |
2045 | if (ret < 0) { | |
2046 | rcu_read_unlock(); | |
2047 | session_unlock_list(); | |
b85dc84c DG |
2048 | /* |
2049 | * No notify thread, stop the UST tracing. However, this is | |
2050 | * not an internal error of the this thread thus setting | |
2051 | * the health error code to a normal exit. | |
2052 | */ | |
2053 | err = 0; | |
d88aee68 | 2054 | goto error; |
6620da75 | 2055 | } |
d88aee68 | 2056 | |
d0b96690 DG |
2057 | /* |
2058 | * Update newly registered application with the tracing | |
2059 | * registry info already enabled information. | |
2060 | */ | |
2061 | update_ust_app(app->sock); | |
d88aee68 DG |
2062 | |
2063 | /* | |
2064 | * Don't care about return value. Let the manage apps threads | |
2065 | * handle app unregistration upon socket close. | |
2066 | */ | |
fb45065e | 2067 | (void) ust_app_register_done(app); |
d88aee68 DG |
2068 | |
2069 | /* | |
2070 | * Even if the application socket has been closed, send the app | |
2071 | * to the thread and unregistration will take place at that | |
2072 | * place. | |
2073 | */ | |
2074 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 2075 | if (ret < 0) { |
d88aee68 DG |
2076 | rcu_read_unlock(); |
2077 | session_unlock_list(); | |
b85dc84c DG |
2078 | /* |
2079 | * No apps. thread, stop the UST tracing. However, this is | |
2080 | * not an internal error of the this thread thus setting | |
2081 | * the health error code to a normal exit. | |
2082 | */ | |
2083 | err = 0; | |
d88aee68 | 2084 | goto error; |
d0b96690 | 2085 | } |
d88aee68 | 2086 | |
d0b96690 DG |
2087 | rcu_read_unlock(); |
2088 | session_unlock_list(); | |
099e26bd | 2089 | } |
099e26bd DG |
2090 | } while (node != NULL); |
2091 | ||
12e2b881 | 2092 | health_poll_entry(); |
099e26bd DG |
2093 | /* Futex wait on queue. Blocking call on futex() */ |
2094 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 2095 | health_poll_exit(); |
099e26bd | 2096 | } |
12e2b881 MD |
2097 | /* Normal exit, no error */ |
2098 | err = 0; | |
099e26bd DG |
2099 | |
2100 | error: | |
d88aee68 DG |
2101 | /* Clean up wait queue. */ |
2102 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 2103 | &wait_queue.head, head) { |
d88aee68 | 2104 | cds_list_del(&wait_node->head); |
f45e313d | 2105 | wait_queue.count--; |
d88aee68 DG |
2106 | free(wait_node); |
2107 | } | |
2108 | ||
772b8f4d MD |
2109 | /* Empty command queue. */ |
2110 | for (;;) { | |
2111 | /* Dequeue command for registration */ | |
2112 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); | |
2113 | if (node == NULL) { | |
2114 | break; | |
2115 | } | |
2116 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
2117 | ret = close(ust_cmd->sock); | |
2118 | if (ret < 0) { | |
2119 | PERROR("close ust sock exit dispatch %d", ust_cmd->sock); | |
2120 | } | |
2121 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2122 | free(ust_cmd); | |
2123 | } | |
2124 | ||
9ad42ec1 | 2125 | error_testpoint: |
099e26bd | 2126 | DBG("Dispatch thread dying"); |
12e2b881 MD |
2127 | if (err) { |
2128 | health_error(); | |
2129 | ERR("Health error occurred in %s", __func__); | |
2130 | } | |
8782cc74 | 2131 | health_unregister(health_sessiond); |
78d8cf23 | 2132 | rcu_unregister_thread(); |
099e26bd DG |
2133 | return NULL; |
2134 | } | |
2135 | ||
2136 | /* | |
2137 | * This thread manage application registration. | |
2138 | */ | |
2139 | static void *thread_registration_apps(void *data) | |
1d4b027a | 2140 | { |
139ac872 | 2141 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
2142 | uint32_t revents, nb_fd; |
2143 | struct lttng_poll_event events; | |
099e26bd DG |
2144 | /* |
2145 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
2146 | * freed in the manage apps thread. | |
2147 | */ | |
2148 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 2149 | |
099e26bd | 2150 | DBG("[thread] Manage application registration started"); |
1d4b027a | 2151 | |
6c71277b | 2152 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 2153 | |
e547b070 | 2154 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
2155 | goto error_testpoint; |
2156 | } | |
8ac94142 | 2157 | |
1d4b027a DG |
2158 | ret = lttcomm_listen_unix_sock(apps_sock); |
2159 | if (ret < 0) { | |
76d7553f | 2160 | goto error_listen; |
1d4b027a DG |
2161 | } |
2162 | ||
5eb91c98 DG |
2163 | /* |
2164 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
2165 | * more will be added to this poll set. | |
2166 | */ | |
d0b96690 | 2167 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 2168 | if (ret < 0) { |
76d7553f | 2169 | goto error_create_poll; |
5eb91c98 | 2170 | } |
273ea72c | 2171 | |
5eb91c98 DG |
2172 | /* Add the application registration socket */ |
2173 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
2174 | if (ret < 0) { | |
76d7553f | 2175 | goto error_poll_add; |
5eb91c98 | 2176 | } |
273ea72c | 2177 | |
1d4b027a | 2178 | /* Notify all applications to register */ |
0fdd1e2c DG |
2179 | ret = notify_ust_apps(1); |
2180 | if (ret < 0) { | |
2181 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
2182 | "Execution continues but there might be problem for already\n" |
2183 | "running applications that wishes to register."); | |
0fdd1e2c | 2184 | } |
1d4b027a DG |
2185 | |
2186 | while (1) { | |
2187 | DBG("Accepting application registration"); | |
273ea72c DG |
2188 | |
2189 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 2190 | restart: |
a78af745 | 2191 | health_poll_entry(); |
5eb91c98 | 2192 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 2193 | health_poll_exit(); |
273ea72c | 2194 | if (ret < 0) { |
88f2b785 MD |
2195 | /* |
2196 | * Restart interrupted system call. | |
2197 | */ | |
2198 | if (errno == EINTR) { | |
2199 | goto restart; | |
2200 | } | |
273ea72c DG |
2201 | goto error; |
2202 | } | |
2203 | ||
0d9c5d77 DG |
2204 | nb_fd = ret; |
2205 | ||
5eb91c98 | 2206 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 2207 | health_code_update(); |
139ac872 | 2208 | |
5eb91c98 DG |
2209 | /* Fetch once the poll data */ |
2210 | revents = LTTNG_POLL_GETEV(&events, i); | |
2211 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 2212 | |
fd20dac9 MD |
2213 | if (!revents) { |
2214 | /* No activity for this FD (poll implementation). */ | |
2215 | continue; | |
2216 | } | |
2217 | ||
5eb91c98 | 2218 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 2219 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 2220 | if (ret) { |
139ac872 MD |
2221 | err = 0; |
2222 | goto exit; | |
90014c57 | 2223 | } |
1d4b027a | 2224 | |
5eb91c98 DG |
2225 | /* Event on the registration socket */ |
2226 | if (pollfd == apps_sock) { | |
03e43155 | 2227 | if (revents & LPOLLIN) { |
5eb91c98 DG |
2228 | sock = lttcomm_accept_unix_sock(apps_sock); |
2229 | if (sock < 0) { | |
2230 | goto error; | |
2231 | } | |
099e26bd | 2232 | |
16c5c8fa DG |
2233 | /* |
2234 | * Set socket timeout for both receiving and ending. | |
2235 | * app_socket_timeout is in seconds, whereas | |
2236 | * lttcomm_setsockopt_rcv_timeout and | |
2237 | * lttcomm_setsockopt_snd_timeout expect msec as | |
2238 | * parameter. | |
2239 | */ | |
28ce0ff2 JG |
2240 | if (app_socket_timeout >= 0) { |
2241 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
2242 | app_socket_timeout * 1000); | |
2243 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
2244 | app_socket_timeout * 1000); | |
2245 | } | |
16c5c8fa | 2246 | |
b662582b DG |
2247 | /* |
2248 | * Set the CLOEXEC flag. Return code is useless because | |
2249 | * either way, the show must go on. | |
2250 | */ | |
2251 | (void) utils_set_fd_cloexec(sock); | |
2252 | ||
5eb91c98 | 2253 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 2254 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 2255 | if (ust_cmd == NULL) { |
76d7553f | 2256 | PERROR("ust command zmalloc"); |
41ed8e47 MD |
2257 | ret = close(sock); |
2258 | if (ret) { | |
2259 | PERROR("close"); | |
2260 | } | |
5eb91c98 DG |
2261 | goto error; |
2262 | } | |
1d4b027a | 2263 | |
5eb91c98 DG |
2264 | /* |
2265 | * Using message-based transmissions to ensure we don't | |
2266 | * have to deal with partially received messages. | |
2267 | */ | |
4063050c MD |
2268 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
2269 | if (ret < 0) { | |
2270 | ERR("Exhausted file descriptors allowed for applications."); | |
2271 | free(ust_cmd); | |
2272 | ret = close(sock); | |
2273 | if (ret) { | |
2274 | PERROR("close"); | |
2275 | } | |
2276 | sock = -1; | |
2277 | continue; | |
2278 | } | |
d88aee68 | 2279 | |
840cb59c | 2280 | health_code_update(); |
d0b96690 DG |
2281 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
2282 | if (ret < 0) { | |
5eb91c98 | 2283 | free(ust_cmd); |
d0b96690 | 2284 | /* Close socket of the application. */ |
76d7553f MD |
2285 | ret = close(sock); |
2286 | if (ret) { | |
2287 | PERROR("close"); | |
2288 | } | |
4063050c | 2289 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 2290 | sock = -1; |
5eb91c98 DG |
2291 | continue; |
2292 | } | |
840cb59c | 2293 | health_code_update(); |
099e26bd | 2294 | |
5eb91c98 | 2295 | ust_cmd->sock = sock; |
34a2494f | 2296 | sock = -1; |
099e26bd | 2297 | |
5eb91c98 DG |
2298 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2299 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2300 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2301 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2302 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2303 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2304 | |
5eb91c98 DG |
2305 | /* |
2306 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2307 | * has been taken! This apps will be part of the *system*. |
5eb91c98 | 2308 | */ |
8bdee6e2 | 2309 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
5eb91c98 DG |
2310 | |
2311 | /* | |
2312 | * Wake the registration queue futex. Implicit memory | |
8bdee6e2 | 2313 | * barrier with the exchange in cds_wfcq_enqueue. |
5eb91c98 DG |
2314 | */ |
2315 | futex_nto1_wake(&ust_cmd_queue.futex); | |
03e43155 MD |
2316 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2317 | ERR("Register apps socket poll error"); | |
2318 | goto error; | |
2319 | } else { | |
2320 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2321 | goto error; | |
5eb91c98 DG |
2322 | } |
2323 | } | |
90014c57 | 2324 | } |
1d4b027a DG |
2325 | } |
2326 | ||
139ac872 | 2327 | exit: |
1d4b027a | 2328 | error: |
0fdd1e2c DG |
2329 | /* Notify that the registration thread is gone */ |
2330 | notify_ust_apps(0); | |
2331 | ||
a4b35e07 | 2332 | if (apps_sock >= 0) { |
76d7553f MD |
2333 | ret = close(apps_sock); |
2334 | if (ret) { | |
2335 | PERROR("close"); | |
2336 | } | |
a4b35e07 | 2337 | } |
46c3f085 | 2338 | if (sock >= 0) { |
76d7553f MD |
2339 | ret = close(sock); |
2340 | if (ret) { | |
2341 | PERROR("close"); | |
2342 | } | |
4063050c | 2343 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2344 | } |
273ea72c | 2345 | unlink(apps_unix_sock_path); |
0fdd1e2c | 2346 | |
76d7553f | 2347 | error_poll_add: |
5eb91c98 | 2348 | lttng_poll_clean(&events); |
76d7553f MD |
2349 | error_listen: |
2350 | error_create_poll: | |
6993eeb3 | 2351 | error_testpoint: |
76d7553f | 2352 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2353 | if (err) { |
2354 | health_error(); | |
2355 | ERR("Health error occurred in %s", __func__); | |
2356 | } | |
8782cc74 | 2357 | health_unregister(health_sessiond); |
5eb91c98 | 2358 | |
1d4b027a DG |
2359 | return NULL; |
2360 | } | |
2361 | ||
8c0faa1d | 2362 | /* |
3bd1e081 | 2363 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2364 | * exec or it will fails. |
8c0faa1d | 2365 | */ |
3bd1e081 | 2366 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2367 | { |
a23ec3a7 | 2368 | int ret, clock_ret; |
ee0b0061 DG |
2369 | struct timespec timeout; |
2370 | ||
13a7bce3 JG |
2371 | /* |
2372 | * Make sure we set the readiness flag to 0 because we are NOT ready. | |
2373 | * This access to consumer_thread_is_ready does not need to be | |
2374 | * protected by consumer_data.cond_mutex (yet) since the consumer | |
2375 | * management thread has not been started at this point. | |
2376 | */ | |
a23ec3a7 | 2377 | consumer_data->consumer_thread_is_ready = 0; |
8c0faa1d | 2378 | |
a23ec3a7 DG |
2379 | /* Setup pthread condition */ |
2380 | ret = pthread_condattr_init(&consumer_data->condattr); | |
4a15001e | 2381 | if (ret) { |
a23ec3a7 DG |
2382 | errno = ret; |
2383 | PERROR("pthread_condattr_init consumer data"); | |
2384 | goto error; | |
2385 | } | |
2386 | ||
2387 | /* | |
2388 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2389 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2390 | * for a more details and how we noticed it. | |
2391 | */ | |
2392 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
4a15001e | 2393 | if (ret) { |
a23ec3a7 DG |
2394 | errno = ret; |
2395 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2396 | goto error; |
2397 | } | |
8c0faa1d | 2398 | |
a23ec3a7 | 2399 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
4a15001e | 2400 | if (ret) { |
a23ec3a7 DG |
2401 | errno = ret; |
2402 | PERROR("pthread_cond_init consumer data"); | |
2403 | goto error; | |
2404 | } | |
2405 | ||
1a1a34b4 MJ |
2406 | ret = pthread_create(&consumer_data->thread, default_pthread_attr(), |
2407 | thread_manage_consumer, consumer_data); | |
4a15001e MD |
2408 | if (ret) { |
2409 | errno = ret; | |
3bd1e081 | 2410 | PERROR("pthread_create consumer"); |
ee0b0061 | 2411 | ret = -1; |
8c0faa1d DG |
2412 | goto error; |
2413 | } | |
2414 | ||
a23ec3a7 DG |
2415 | /* We are about to wait on a pthread condition */ |
2416 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2417 | ||
ee0b0061 | 2418 | /* Get time for sem_timedwait absolute timeout */ |
389fbf04 | 2419 | clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout); |
a23ec3a7 DG |
2420 | /* |
2421 | * Set the timeout for the condition timed wait even if the clock gettime | |
2422 | * call fails since we might loop on that call and we want to avoid to | |
2423 | * increment the timeout too many times. | |
2424 | */ | |
2425 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2426 | ||
2427 | /* | |
2428 | * The following loop COULD be skipped in some conditions so this is why we | |
2429 | * set ret to 0 in order to make sure at least one round of the loop is | |
2430 | * done. | |
2431 | */ | |
2432 | ret = 0; | |
2433 | ||
2434 | /* | |
2435 | * Loop until the condition is reached or when a timeout is reached. Note | |
2436 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2437 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2438 | * possible. This loop does not take any chances and works with both of | |
2439 | * them. | |
2440 | */ | |
2441 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2442 | if (clock_ret < 0) { | |
2443 | PERROR("clock_gettime spawn consumer"); | |
2444 | /* Infinite wait for the consumerd thread to be ready */ | |
2445 | ret = pthread_cond_wait(&consumer_data->cond, | |
2446 | &consumer_data->cond_mutex); | |
2447 | } else { | |
2448 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2449 | &consumer_data->cond_mutex, &timeout); | |
2450 | } | |
ee0b0061 | 2451 | } |
8c0faa1d | 2452 | |
a23ec3a7 DG |
2453 | /* Release the pthread condition */ |
2454 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2455 | ||
2456 | if (ret != 0) { | |
2457 | errno = ret; | |
2458 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2459 | int pth_ret; |
2460 | ||
ee0b0061 DG |
2461 | /* |
2462 | * Call has timed out so we kill the kconsumerd_thread and return | |
2463 | * an error. | |
2464 | */ | |
a23ec3a7 DG |
2465 | ERR("Condition timed out. The consumer thread was never ready." |
2466 | " Killing it"); | |
4282f9a3 DG |
2467 | pth_ret = pthread_cancel(consumer_data->thread); |
2468 | if (pth_ret < 0) { | |
3bd1e081 | 2469 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2470 | } |
2471 | } else { | |
a23ec3a7 | 2472 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2473 | } |
4282f9a3 DG |
2474 | /* Caller is expecting a negative value on failure. */ |
2475 | ret = -1; | |
ee0b0061 DG |
2476 | goto error; |
2477 | } | |
2478 | ||
3bd1e081 MD |
2479 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2480 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2481 | ERR("Consumerd did not start"); |
3bd1e081 | 2482 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2483 | goto error; |
2484 | } | |
3bd1e081 | 2485 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2486 | |
8c0faa1d DG |
2487 | return 0; |
2488 | ||
2489 | error: | |
2490 | return ret; | |
2491 | } | |
2492 | ||
d9800920 | 2493 | /* |
3bd1e081 | 2494 | * Join consumer thread |
d9800920 | 2495 | */ |
3bd1e081 | 2496 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2497 | { |
2498 | void *status; | |
cf3af59e | 2499 | |
e8209f6b DG |
2500 | /* Consumer pid must be a real one. */ |
2501 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2502 | int ret; |
3bd1e081 | 2503 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2504 | if (ret) { |
4a15001e | 2505 | PERROR("Error killing consumer daemon"); |
cf3af59e MD |
2506 | return ret; |
2507 | } | |
3bd1e081 | 2508 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2509 | } else { |
2510 | return 0; | |
2511 | } | |
2512 | } | |
2513 | ||
8c0faa1d | 2514 | /* |
3bd1e081 | 2515 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2516 | * |
d063d709 | 2517 | * Return pid if successful else -1. |
8c0faa1d | 2518 | */ |
3bd1e081 | 2519 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2520 | { |
2521 | int ret; | |
2522 | pid_t pid; | |
94c55f17 | 2523 | const char *consumer_to_use; |
53086306 | 2524 | const char *verbosity; |
94c55f17 | 2525 | struct stat st; |
8c0faa1d | 2526 | |
3bd1e081 | 2527 | DBG("Spawning consumerd"); |
c49dc785 | 2528 | |
8c0faa1d DG |
2529 | pid = fork(); |
2530 | if (pid == 0) { | |
2531 | /* | |
3bd1e081 | 2532 | * Exec consumerd. |
8c0faa1d | 2533 | */ |
daee5345 | 2534 | if (opt_verbose_consumer) { |
53086306 | 2535 | verbosity = "--verbose"; |
4421f712 | 2536 | } else if (lttng_opt_quiet) { |
53086306 | 2537 | verbosity = "--quiet"; |
4421f712 DG |
2538 | } else { |
2539 | verbosity = ""; | |
53086306 | 2540 | } |
4421f712 | 2541 | |
3bd1e081 MD |
2542 | switch (consumer_data->type) { |
2543 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2544 | /* |
c7704d57 DG |
2545 | * Find out which consumerd to execute. We will first try the |
2546 | * 64-bit path, then the sessiond's installation directory, and | |
2547 | * fallback on the 32-bit one, | |
94c55f17 | 2548 | */ |
63a799e8 AM |
2549 | DBG3("Looking for a kernel consumer at these locations:"); |
2550 | DBG3(" 1) %s", consumerd64_bin); | |
2551 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2552 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2553 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2554 | DBG3("Found location #1"); |
94c55f17 | 2555 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2556 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2557 | DBG3("Found location #2"); |
94c55f17 | 2558 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2559 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2560 | DBG3("Found location #3"); |
eb1e0bd4 | 2561 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2562 | } else { |
63a799e8 | 2563 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2564 | ret = -EINVAL; |
5b49a21f | 2565 | goto error; |
94c55f17 AM |
2566 | } |
2567 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
4282f9a3 | 2568 | ret = execl(consumer_to_use, |
94c55f17 AM |
2569 | "lttng-consumerd", verbosity, "-k", |
2570 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2571 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2572 | "--group", tracing_group_name, |
94c55f17 | 2573 | NULL); |
3bd1e081 | 2574 | break; |
7753dea8 MD |
2575 | case LTTNG_CONSUMER64_UST: |
2576 | { | |
b1e0b6b6 | 2577 | char *tmpnew = NULL; |
8f4905da MD |
2578 | |
2579 | if (consumerd64_libdir[0] != '\0') { | |
2580 | char *tmp; | |
2581 | size_t tmplen; | |
2582 | ||
e8fa9fb0 | 2583 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2584 | if (!tmp) { |
2585 | tmp = ""; | |
2586 | } | |
2587 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2588 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2589 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2590 | if (!tmpnew) { | |
2591 | ret = -ENOMEM; | |
2592 | goto error; | |
2593 | } | |
2594 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2595 | strcat(tmpnew, consumerd64_libdir); | |
2596 | if (tmp[0] != '\0') { | |
2597 | strcat(tmpnew, ":"); | |
2598 | strcat(tmpnew, tmp); | |
2599 | } | |
2600 | ret = putenv(tmpnew); | |
2601 | if (ret) { | |
2602 | ret = -errno; | |
c6f76da9 | 2603 | free(tmpnew); |
8f4905da MD |
2604 | goto error; |
2605 | } | |
2606 | } | |
94c55f17 | 2607 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2608 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2609 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2610 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2611 | "--group", tracing_group_name, |
7753dea8 | 2612 | NULL); |
8f4905da MD |
2613 | if (consumerd64_libdir[0] != '\0') { |
2614 | free(tmpnew); | |
2615 | } | |
3bd1e081 | 2616 | break; |
7753dea8 MD |
2617 | } |
2618 | case LTTNG_CONSUMER32_UST: | |
2619 | { | |
937dde8e | 2620 | char *tmpnew = NULL; |
8f4905da MD |
2621 | |
2622 | if (consumerd32_libdir[0] != '\0') { | |
2623 | char *tmp; | |
2624 | size_t tmplen; | |
2625 | ||
e8fa9fb0 | 2626 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2627 | if (!tmp) { |
2628 | tmp = ""; | |
2629 | } | |
2630 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2631 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2632 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2633 | if (!tmpnew) { | |
2634 | ret = -ENOMEM; | |
2635 | goto error; | |
2636 | } | |
2637 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2638 | strcat(tmpnew, consumerd32_libdir); | |
2639 | if (tmp[0] != '\0') { | |
2640 | strcat(tmpnew, ":"); | |
2641 | strcat(tmpnew, tmp); | |
2642 | } | |
2643 | ret = putenv(tmpnew); | |
2644 | if (ret) { | |
2645 | ret = -errno; | |
c6f76da9 | 2646 | free(tmpnew); |
8f4905da MD |
2647 | goto error; |
2648 | } | |
2649 | } | |
94c55f17 | 2650 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2651 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2652 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2653 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2654 | "--group", tracing_group_name, |
7753dea8 | 2655 | NULL); |
8f4905da MD |
2656 | if (consumerd32_libdir[0] != '\0') { |
2657 | free(tmpnew); | |
2658 | } | |
7753dea8 MD |
2659 | break; |
2660 | } | |
3bd1e081 | 2661 | default: |
db58870b | 2662 | ERR("unknown consumer type"); |
3bd1e081 MD |
2663 | exit(EXIT_FAILURE); |
2664 | } | |
8c0faa1d | 2665 | if (errno != 0) { |
4282f9a3 | 2666 | PERROR("Consumer execl()"); |
8c0faa1d | 2667 | } |
4282f9a3 | 2668 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2669 | exit(EXIT_FAILURE); |
2670 | } else if (pid > 0) { | |
2671 | ret = pid; | |
8c0faa1d | 2672 | } else { |
76d7553f | 2673 | PERROR("start consumer fork"); |
8c0faa1d | 2674 | ret = -errno; |
8c0faa1d | 2675 | } |
8f4905da | 2676 | error: |
8c0faa1d DG |
2677 | return ret; |
2678 | } | |
2679 | ||
693bd40b | 2680 | /* |
3bd1e081 | 2681 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2682 | */ |
3bd1e081 | 2683 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2684 | { |
c617c0c6 | 2685 | int ret; |
edb8b045 DG |
2686 | |
2687 | /* | |
2688 | * Set the listen() state on the socket since there is a possible race | |
2689 | * between the exec() of the consumer daemon and this call if place in the | |
2690 | * consumer thread. See bug #366 for more details. | |
2691 | */ | |
2692 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2693 | if (ret < 0) { | |
2694 | goto error; | |
2695 | } | |
693bd40b | 2696 | |
3bd1e081 MD |
2697 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2698 | if (consumer_data->pid != 0) { | |
2699 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2700 | goto end; |
2701 | } | |
693bd40b | 2702 | |
3bd1e081 | 2703 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2704 | if (ret < 0) { |
3bd1e081 MD |
2705 | ERR("Spawning consumerd failed"); |
2706 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2707 | goto error; |
693bd40b | 2708 | } |
c49dc785 | 2709 | |
3bd1e081 MD |
2710 | /* Setting up the consumer_data pid */ |
2711 | consumer_data->pid = ret; | |
48842b30 | 2712 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2713 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2714 | |
3bd1e081 MD |
2715 | DBG2("Spawning consumer control thread"); |
2716 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2717 | if (ret < 0) { |
3bd1e081 | 2718 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2719 | goto error; |
2720 | } | |
2721 | ||
c49dc785 | 2722 | end: |
693bd40b DG |
2723 | return 0; |
2724 | ||
2725 | error: | |
331744e3 | 2726 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2727 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2728 | int err; |
2729 | ||
edb8b045 DG |
2730 | err = close(consumer_data->err_sock); |
2731 | if (err < 0) { | |
2732 | PERROR("close consumer data error socket"); | |
2733 | } | |
2734 | } | |
693bd40b DG |
2735 | return ret; |
2736 | } | |
2737 | ||
b73401da | 2738 | /* |
096102bd | 2739 | * Setup necessary data for kernel tracer action. |
b73401da | 2740 | */ |
096102bd | 2741 | static int init_kernel_tracer(void) |
b73401da DG |
2742 | { |
2743 | int ret; | |
b73401da | 2744 | |
096102bd DG |
2745 | /* Modprobe lttng kernel modules */ |
2746 | ret = modprobe_lttng_control(); | |
b73401da | 2747 | if (ret < 0) { |
b73401da DG |
2748 | goto error; |
2749 | } | |
2750 | ||
096102bd DG |
2751 | /* Open debugfs lttng */ |
2752 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2753 | if (kernel_tracer_fd < 0) { | |
2754 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b | 2755 | goto error_open; |
54d01ffb DG |
2756 | } |
2757 | ||
2f77fc4b DG |
2758 | /* Validate kernel version */ |
2759 | ret = kernel_validate_version(kernel_tracer_fd); | |
2760 | if (ret < 0) { | |
2761 | goto error_version; | |
b551a063 | 2762 | } |
54d01ffb | 2763 | |
2f77fc4b DG |
2764 | ret = modprobe_lttng_data(); |
2765 | if (ret < 0) { | |
2766 | goto error_modules; | |
54d01ffb DG |
2767 | } |
2768 | ||
2f77fc4b DG |
2769 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2770 | return 0; | |
2771 | ||
2772 | error_version: | |
2773 | modprobe_remove_lttng_control(); | |
2774 | ret = close(kernel_tracer_fd); | |
2775 | if (ret) { | |
2776 | PERROR("close"); | |
b551a063 | 2777 | } |
2f77fc4b | 2778 | kernel_tracer_fd = -1; |
f73fabfd | 2779 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2780 | |
2f77fc4b DG |
2781 | error_modules: |
2782 | ret = close(kernel_tracer_fd); | |
2783 | if (ret) { | |
2784 | PERROR("close"); | |
b551a063 | 2785 | } |
54d01ffb | 2786 | |
2f77fc4b DG |
2787 | error_open: |
2788 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2789 | |
2790 | error: | |
2f77fc4b DG |
2791 | WARN("No kernel tracer available"); |
2792 | kernel_tracer_fd = -1; | |
2793 | if (!is_root) { | |
f73fabfd | 2794 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2795 | } else { |
f73fabfd | 2796 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2797 | } |
54d01ffb DG |
2798 | } |
2799 | ||
2f77fc4b | 2800 | |
54d01ffb | 2801 | /* |
2f77fc4b DG |
2802 | * Copy consumer output from the tracing session to the domain session. The |
2803 | * function also applies the right modification on a per domain basis for the | |
2804 | * trace files destination directory. | |
36b588ed MD |
2805 | * |
2806 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2807 | */ |
2f77fc4b | 2808 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2809 | { |
2810 | int ret; | |
2f77fc4b DG |
2811 | const char *dir_name; |
2812 | struct consumer_output *consumer; | |
2813 | ||
2814 | assert(session); | |
2815 | assert(session->consumer); | |
54d01ffb | 2816 | |
b551a063 DG |
2817 | switch (domain) { |
2818 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2819 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2820 | /* |
2821 | * XXX: We should audit the session creation and what this function | |
2822 | * does "extra" in order to avoid a destroy since this function is used | |
2823 | * in the domain session creation (kernel and ust) only. Same for UST | |
2824 | * domain. | |
2825 | */ | |
2826 | if (session->kernel_session->consumer) { | |
6addfa37 | 2827 | consumer_output_put(session->kernel_session->consumer); |
09a90bcd | 2828 | } |
2f77fc4b DG |
2829 | session->kernel_session->consumer = |
2830 | consumer_copy_output(session->consumer); | |
2831 | /* Ease our life a bit for the next part */ | |
2832 | consumer = session->kernel_session->consumer; | |
2833 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2834 | break; |
f20baf8e | 2835 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2836 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2837 | case LTTNG_DOMAIN_PYTHON: |
b551a063 | 2838 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2839 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd | 2840 | if (session->ust_session->consumer) { |
6addfa37 | 2841 | consumer_output_put(session->ust_session->consumer); |
09a90bcd | 2842 | } |
2f77fc4b DG |
2843 | session->ust_session->consumer = |
2844 | consumer_copy_output(session->consumer); | |
2845 | /* Ease our life a bit for the next part */ | |
2846 | consumer = session->ust_session->consumer; | |
2847 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2848 | break; |
2849 | default: | |
f73fabfd | 2850 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2851 | goto error; |
2852 | } | |
2853 | ||
2f77fc4b | 2854 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2855 | strncat(consumer->subdir, dir_name, |
2856 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2857 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2858 | ||
f73fabfd | 2859 | ret = LTTNG_OK; |
54d01ffb DG |
2860 | |
2861 | error: | |
2862 | return ret; | |
2863 | } | |
2864 | ||
00e2e675 | 2865 | /* |
2f77fc4b | 2866 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2867 | * |
2868 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2869 | */ |
2f77fc4b DG |
2870 | static int create_ust_session(struct ltt_session *session, |
2871 | struct lttng_domain *domain) | |
00e2e675 DG |
2872 | { |
2873 | int ret; | |
2f77fc4b | 2874 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2875 | |
a4b92340 | 2876 | assert(session); |
2f77fc4b DG |
2877 | assert(domain); |
2878 | assert(session->consumer); | |
a4b92340 | 2879 | |
2f77fc4b | 2880 | switch (domain->type) { |
f20baf8e | 2881 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2882 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2883 | case LTTNG_DOMAIN_PYTHON: |
2f77fc4b DG |
2884 | case LTTNG_DOMAIN_UST: |
2885 | break; | |
2886 | default: | |
2887 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2888 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2889 | goto error; |
2890 | } | |
2891 | ||
2f77fc4b DG |
2892 | DBG("Creating UST session"); |
2893 | ||
dec56f6c | 2894 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2895 | if (lus == NULL) { |
f73fabfd | 2896 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2897 | goto error; |
2898 | } | |
2899 | ||
2f77fc4b DG |
2900 | lus->uid = session->uid; |
2901 | lus->gid = session->gid; | |
2bba9e53 | 2902 | lus->output_traces = session->output_traces; |
27babd3a | 2903 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2904 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2905 | session->ust_session = lus; |
d7ba1388 | 2906 | if (session->shm_path[0]) { |
3d071855 MD |
2907 | strncpy(lus->root_shm_path, session->shm_path, |
2908 | sizeof(lus->root_shm_path)); | |
2909 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2910 | strncpy(lus->shm_path, session->shm_path, |
2911 | sizeof(lus->shm_path)); | |
2912 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
2913 | strncat(lus->shm_path, "/ust", | |
2914 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
2915 | } | |
2f77fc4b DG |
2916 | /* Copy session output to the newly created UST session */ |
2917 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2918 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2919 | goto error; |
2920 | } | |
2921 | ||
f73fabfd | 2922 | return LTTNG_OK; |
00e2e675 DG |
2923 | |
2924 | error: | |
2f77fc4b DG |
2925 | free(lus); |
2926 | session->ust_session = NULL; | |
00e2e675 DG |
2927 | return ret; |
2928 | } | |
2929 | ||
2930 | /* | |
2f77fc4b | 2931 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2932 | */ |
2f77fc4b | 2933 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2934 | { |
2935 | int ret; | |
a4b92340 | 2936 | |
2f77fc4b | 2937 | DBG("Creating kernel session"); |
00e2e675 | 2938 | |
2f77fc4b DG |
2939 | ret = kernel_create_session(session, kernel_tracer_fd); |
2940 | if (ret < 0) { | |
f73fabfd | 2941 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2942 | goto error; |
2943 | } | |
2944 | ||
2f77fc4b DG |
2945 | /* Code flow safety */ |
2946 | assert(session->kernel_session); | |
2947 | ||
2948 | /* Copy session output to the newly created Kernel session */ | |
2949 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2950 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2951 | goto error; |
2952 | } | |
2953 | ||
2f77fc4b DG |
2954 | /* Create directory(ies) on local filesystem. */ |
2955 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2956 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2957 | ret = run_as_mkdir_recursive( | |
2958 | session->kernel_session->consumer->dst.trace_path, | |
2959 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2960 | if (ret < 0) { | |
df5b86c8 | 2961 | if (errno != EEXIST) { |
2f77fc4b | 2962 | ERR("Trace directory creation error"); |
00e2e675 DG |
2963 | goto error; |
2964 | } | |
00e2e675 | 2965 | } |
2f77fc4b | 2966 | } |
00e2e675 | 2967 | |
2f77fc4b DG |
2968 | session->kernel_session->uid = session->uid; |
2969 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2970 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2971 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2972 | |
f73fabfd | 2973 | return LTTNG_OK; |
00e2e675 | 2974 | |
2f77fc4b DG |
2975 | error: |
2976 | trace_kernel_destroy_session(session->kernel_session); | |
2977 | session->kernel_session = NULL; | |
2978 | return ret; | |
2979 | } | |
00e2e675 | 2980 | |
2f77fc4b DG |
2981 | /* |
2982 | * Count number of session permitted by uid/gid. | |
2983 | */ | |
2984 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2985 | { | |
2986 | unsigned int i = 0; | |
2987 | struct ltt_session *session; | |
07424f16 | 2988 | |
2f77fc4b DG |
2989 | DBG("Counting number of available session for UID %d GID %d", |
2990 | uid, gid); | |
2991 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2992 | /* |
2f77fc4b | 2993 | * Only list the sessions the user can control. |
00e2e675 | 2994 | */ |
2f77fc4b DG |
2995 | if (!session_access_ok(session, uid, gid)) { |
2996 | continue; | |
2997 | } | |
2998 | i++; | |
a4b92340 | 2999 | } |
2f77fc4b | 3000 | return i; |
00e2e675 DG |
3001 | } |
3002 | ||
54d01ffb DG |
3003 | /* |
3004 | * Process the command requested by the lttng client within the command | |
3005 | * context structure. This function make sure that the return structure (llm) | |
3006 | * is set and ready for transmission before returning. | |
3007 | * | |
3008 | * Return any error encountered or 0 for success. | |
53a80697 MD |
3009 | * |
3010 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
3011 | * |
3012 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 3013 | */ |
53a80697 MD |
3014 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
3015 | int *sock_error) | |
54d01ffb | 3016 | { |
f73fabfd | 3017 | int ret = LTTNG_OK; |
44d3bd01 | 3018 | int need_tracing_session = 1; |
2e09ba09 | 3019 | int need_domain; |
54d01ffb DG |
3020 | |
3021 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3022 | ||
3745d315 MD |
3023 | assert(!rcu_read_ongoing()); |
3024 | ||
53a80697 MD |
3025 | *sock_error = 0; |
3026 | ||
2e09ba09 MD |
3027 | switch (cmd_ctx->lsm->cmd_type) { |
3028 | case LTTNG_CREATE_SESSION: | |
27babd3a | 3029 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 3030 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
3031 | case LTTNG_DESTROY_SESSION: |
3032 | case LTTNG_LIST_SESSIONS: | |
3033 | case LTTNG_LIST_DOMAINS: | |
3034 | case LTTNG_START_TRACE: | |
3035 | case LTTNG_STOP_TRACE: | |
6d805429 | 3036 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
3037 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3038 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3039 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3040 | case LTTNG_SNAPSHOT_RECORD: | |
fb198a11 | 3041 | case LTTNG_SAVE_SESSION: |
d7ba1388 | 3042 | case LTTNG_SET_SESSION_SHM_PATH: |
eded6438 | 3043 | case LTTNG_REGENERATE_METADATA: |
c2561365 | 3044 | case LTTNG_REGENERATE_STATEDUMP: |
2e09ba09 | 3045 | need_domain = 0; |
3aace903 | 3046 | break; |
2e09ba09 MD |
3047 | default: |
3048 | need_domain = 1; | |
3049 | } | |
3050 | ||
3051 | if (opt_no_kernel && need_domain | |
3052 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 3053 | if (!is_root) { |
f73fabfd | 3054 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 3055 | } else { |
f73fabfd | 3056 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 3057 | } |
4fba7219 DG |
3058 | goto error; |
3059 | } | |
3060 | ||
8d3113b2 DG |
3061 | /* Deny register consumer if we already have a spawned consumer. */ |
3062 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
3063 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
3064 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 3065 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 3066 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
3067 | goto error; |
3068 | } | |
3069 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
3070 | } | |
3071 | ||
54d01ffb DG |
3072 | /* |
3073 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3074 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3075 | * command. |
3076 | */ | |
3077 | switch(cmd_ctx->lsm->cmd_type) { | |
3078 | case LTTNG_LIST_SESSIONS: | |
3079 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 3080 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
3081 | case LTTNG_LIST_DOMAINS: |
3082 | case LTTNG_LIST_CHANNELS: | |
3083 | case LTTNG_LIST_EVENTS: | |
834978fd | 3084 | case LTTNG_LIST_SYSCALLS: |
c92af2a5 | 3085 | case LTTNG_LIST_TRACKER_IDS: |
5cd0780d | 3086 | case LTTNG_DATA_PENDING: |
54d01ffb DG |
3087 | break; |
3088 | default: | |
3089 | /* Setup lttng message with no payload */ | |
6e10c9b9 | 3090 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
54d01ffb DG |
3091 | if (ret < 0) { |
3092 | /* This label does not try to unlock the session */ | |
3093 | goto init_setup_error; | |
3094 | } | |
3095 | } | |
3096 | ||
3097 | /* Commands that DO NOT need a session. */ | |
3098 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3099 | case LTTNG_CREATE_SESSION: |
27babd3a | 3100 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 3101 | case LTTNG_CREATE_SESSION_LIVE: |
54d01ffb DG |
3102 | case LTTNG_LIST_SESSIONS: |
3103 | case LTTNG_LIST_TRACEPOINTS: | |
834978fd | 3104 | case LTTNG_LIST_SYSCALLS: |
f37d259d | 3105 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
fb198a11 | 3106 | case LTTNG_SAVE_SESSION: |
44d3bd01 | 3107 | need_tracing_session = 0; |
54d01ffb DG |
3108 | break; |
3109 | default: | |
3110 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3111 | /* |
3112 | * We keep the session list lock across _all_ commands | |
3113 | * for now, because the per-session lock does not | |
3114 | * handle teardown properly. | |
3115 | */ | |
74babd95 | 3116 | session_lock_list(); |
54d01ffb DG |
3117 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3118 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 3119 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
3120 | goto error; |
3121 | } else { | |
3122 | /* Acquire lock for the session */ | |
3123 | session_lock(cmd_ctx->session); | |
3124 | } | |
3125 | break; | |
3126 | } | |
b389abbe | 3127 | |
5f3ecf22 DG |
3128 | /* |
3129 | * Commands that need a valid session but should NOT create one if none | |
3130 | * exists. Instead of creating one and destroying it when the command is | |
3131 | * handled, process that right before so we save some round trip in useless | |
3132 | * code path. | |
3133 | */ | |
3134 | switch (cmd_ctx->lsm->cmd_type) { | |
3135 | case LTTNG_DISABLE_CHANNEL: | |
3136 | case LTTNG_DISABLE_EVENT: | |
5f3ecf22 DG |
3137 | switch (cmd_ctx->lsm->domain.type) { |
3138 | case LTTNG_DOMAIN_KERNEL: | |
3139 | if (!cmd_ctx->session->kernel_session) { | |
3140 | ret = LTTNG_ERR_NO_CHANNEL; | |
3141 | goto error; | |
3142 | } | |
3143 | break; | |
3144 | case LTTNG_DOMAIN_JUL: | |
5cdb6027 | 3145 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3146 | case LTTNG_DOMAIN_PYTHON: |
5f3ecf22 DG |
3147 | case LTTNG_DOMAIN_UST: |
3148 | if (!cmd_ctx->session->ust_session) { | |
3149 | ret = LTTNG_ERR_NO_CHANNEL; | |
3150 | goto error; | |
3151 | } | |
3152 | break; | |
3153 | default: | |
3154 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3155 | goto error; | |
3156 | } | |
3157 | default: | |
3158 | break; | |
3159 | } | |
3160 | ||
2e09ba09 MD |
3161 | if (!need_domain) { |
3162 | goto skip_domain; | |
3163 | } | |
a4b92340 | 3164 | |
54d01ffb DG |
3165 | /* |
3166 | * Check domain type for specific "pre-action". | |
3167 | */ | |
3168 | switch (cmd_ctx->lsm->domain.type) { | |
3169 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3170 | if (!is_root) { |
f73fabfd | 3171 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3172 | goto error; |
3173 | } | |
3174 | ||
54d01ffb | 3175 | /* Kernel tracer check */ |
a4b35e07 | 3176 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3177 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3178 | ret = init_kernel_tracer(); |
3179 | if (ret != 0) { | |
54d01ffb DG |
3180 | goto error; |
3181 | } | |
3182 | } | |
5eb91c98 | 3183 | |
5c827ce0 DG |
3184 | /* Consumer is in an ERROR state. Report back to client */ |
3185 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3186 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3187 | goto error; |
3188 | } | |
3189 | ||
54d01ffb | 3190 | /* Need a session for kernel command */ |
44d3bd01 | 3191 | if (need_tracing_session) { |
54d01ffb | 3192 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3193 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3194 | if (ret < 0) { |
f73fabfd | 3195 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
3196 | goto error; |
3197 | } | |
b389abbe | 3198 | } |
7d29a247 | 3199 | |
54d01ffb | 3200 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3201 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3202 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 3203 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3204 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3205 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3206 | if (ret < 0) { |
f73fabfd | 3207 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 3208 | goto error; |
950131af | 3209 | } |
5c827ce0 | 3210 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3211 | } else { |
3212 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3213 | } |
173af62f | 3214 | |
a4b92340 DG |
3215 | /* |
3216 | * The consumer was just spawned so we need to add the socket to | |
3217 | * the consumer output of the session if exist. | |
3218 | */ | |
3219 | ret = consumer_create_socket(&kconsumer_data, | |
3220 | cmd_ctx->session->kernel_session->consumer); | |
3221 | if (ret < 0) { | |
3222 | goto error; | |
173af62f | 3223 | } |
0d0c377a | 3224 | } |
5c827ce0 | 3225 | |
54d01ffb | 3226 | break; |
b9dfb167 | 3227 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3228 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3229 | case LTTNG_DOMAIN_PYTHON: |
2bdd86d4 | 3230 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3231 | { |
b51ec5b4 MD |
3232 | if (!ust_app_supported()) { |
3233 | ret = LTTNG_ERR_NO_UST; | |
3234 | goto error; | |
3235 | } | |
5c827ce0 DG |
3236 | /* Consumer is in an ERROR state. Report back to client */ |
3237 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3238 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3239 | goto error; |
3240 | } | |
3241 | ||
44d3bd01 | 3242 | if (need_tracing_session) { |
a4b92340 | 3243 | /* Create UST session if none exist. */ |
f6a9efaa | 3244 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3245 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3246 | &cmd_ctx->lsm->domain); |
f73fabfd | 3247 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
3248 | goto error; |
3249 | } | |
3250 | } | |
00e2e675 | 3251 | |
7753dea8 MD |
3252 | /* Start the UST consumer daemons */ |
3253 | /* 64-bit */ | |
3254 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3255 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3256 | ustconsumer64_data.pid == 0 && |
785d2d0d | 3257 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3258 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3259 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3260 | if (ret < 0) { |
f73fabfd | 3261 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 3262 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
3263 | goto error; |
3264 | } | |
48842b30 | 3265 | |
173af62f | 3266 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 3267 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3268 | } else { |
7753dea8 MD |
3269 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3270 | } | |
173af62f DG |
3271 | |
3272 | /* | |
3273 | * Setup socket for consumer 64 bit. No need for atomic access | |
3274 | * since it was set above and can ONLY be set in this thread. | |
3275 | */ | |
a4b92340 DG |
3276 | ret = consumer_create_socket(&ustconsumer64_data, |
3277 | cmd_ctx->session->ust_session->consumer); | |
3278 | if (ret < 0) { | |
3279 | goto error; | |
173af62f DG |
3280 | } |
3281 | ||
7753dea8 | 3282 | /* 32-bit */ |
385b881b | 3283 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
fc7a59ce | 3284 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 3285 | ustconsumer32_data.pid == 0 && |
785d2d0d | 3286 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3287 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
3288 | ret = start_consumerd(&ustconsumer32_data); | |
3289 | if (ret < 0) { | |
f73fabfd | 3290 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 3291 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
3292 | goto error; |
3293 | } | |
5c827ce0 | 3294 | |
173af62f | 3295 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 3296 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3297 | } else { |
3298 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3299 | } |
173af62f DG |
3300 | |
3301 | /* | |
3302 | * Setup socket for consumer 64 bit. No need for atomic access | |
3303 | * since it was set above and can ONLY be set in this thread. | |
3304 | */ | |
a4b92340 DG |
3305 | ret = consumer_create_socket(&ustconsumer32_data, |
3306 | cmd_ctx->session->ust_session->consumer); | |
3307 | if (ret < 0) { | |
3308 | goto error; | |
173af62f | 3309 | } |
44d3bd01 DG |
3310 | } |
3311 | break; | |
48842b30 | 3312 | } |
54d01ffb | 3313 | default: |
54d01ffb DG |
3314 | break; |
3315 | } | |
2e09ba09 | 3316 | skip_domain: |
33a2b854 | 3317 | |
5c827ce0 DG |
3318 | /* Validate consumer daemon state when start/stop trace command */ |
3319 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3320 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3321 | switch (cmd_ctx->lsm->domain.type) { | |
e7619875 JG |
3322 | case LTTNG_DOMAIN_NONE: |
3323 | break; | |
b9dfb167 | 3324 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3325 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3326 | case LTTNG_DOMAIN_PYTHON: |
5c827ce0 DG |
3327 | case LTTNG_DOMAIN_UST: |
3328 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3329 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3330 | goto error; |
3331 | } | |
3332 | break; | |
3333 | case LTTNG_DOMAIN_KERNEL: | |
3334 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3335 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3336 | goto error; |
3337 | } | |
3338 | break; | |
825535cc JG |
3339 | default: |
3340 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3341 | goto error; | |
5c827ce0 DG |
3342 | } |
3343 | } | |
3344 | ||
8e0af1b4 MD |
3345 | /* |
3346 | * Check that the UID or GID match that of the tracing session. | |
3347 | * The root user can interact with all sessions. | |
3348 | */ | |
3349 | if (need_tracing_session) { | |
3350 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3351 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3352 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 3353 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
3354 | goto error; |
3355 | } | |
3356 | } | |
3357 | ||
ffe60014 DG |
3358 | /* |
3359 | * Send relayd information to consumer as soon as we have a domain and a | |
3360 | * session defined. | |
3361 | */ | |
3362 | if (cmd_ctx->session && need_domain) { | |
3363 | /* | |
3364 | * Setup relayd if not done yet. If the relayd information was already | |
3365 | * sent to the consumer, this call will gracefully return. | |
3366 | */ | |
3367 | ret = cmd_setup_relayd(cmd_ctx->session); | |
3368 | if (ret != LTTNG_OK) { | |
3369 | goto error; | |
3370 | } | |
3371 | } | |
3372 | ||
54d01ffb DG |
3373 | /* Process by command type */ |
3374 | switch (cmd_ctx->lsm->cmd_type) { | |
3375 | case LTTNG_ADD_CONTEXT: | |
3376 | { | |
2001793c JG |
3377 | /* |
3378 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
3379 | * payload if the context being added is an application context. | |
3380 | */ | |
3381 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
3382 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
3383 | char *provider_name = NULL, *context_name = NULL; | |
3384 | size_t provider_name_len = | |
3385 | cmd_ctx->lsm->u.context.provider_name_len; | |
3386 | size_t context_name_len = | |
3387 | cmd_ctx->lsm->u.context.context_name_len; | |
3388 | ||
3389 | if (provider_name_len == 0 || context_name_len == 0) { | |
3390 | /* | |
3391 | * Application provider and context names MUST | |
3392 | * be provided. | |
3393 | */ | |
3394 | ret = -LTTNG_ERR_INVALID; | |
3395 | goto error; | |
3396 | } | |
3397 | ||
3398 | provider_name = zmalloc(provider_name_len + 1); | |
3399 | if (!provider_name) { | |
3400 | ret = -LTTNG_ERR_NOMEM; | |
3401 | goto error; | |
3402 | } | |
e0f4d107 JG |
3403 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
3404 | provider_name; | |
2001793c JG |
3405 | |
3406 | context_name = zmalloc(context_name_len + 1); | |
3407 | if (!context_name) { | |
3408 | ret = -LTTNG_ERR_NOMEM; | |
3409 | goto error_add_context; | |
3410 | } | |
e0f4d107 JG |
3411 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
3412 | context_name; | |
2001793c JG |
3413 | |
3414 | ret = lttcomm_recv_unix_sock(sock, provider_name, | |
3415 | provider_name_len); | |
3416 | if (ret < 0) { | |
3417 | goto error_add_context; | |
3418 | } | |
3419 | ||
3420 | ret = lttcomm_recv_unix_sock(sock, context_name, | |
3421 | context_name_len); | |
3422 | if (ret < 0) { | |
3423 | goto error_add_context; | |
3424 | } | |
2001793c JG |
3425 | } |
3426 | ||
3427 | /* | |
3428 | * cmd_add_context assumes ownership of the provider and context | |
3429 | * names. | |
3430 | */ | |
3431 | ret = cmd_add_context(cmd_ctx->session, | |
3432 | cmd_ctx->lsm->domain.type, | |
54d01ffb | 3433 | cmd_ctx->lsm->u.context.channel_name, |
2001793c JG |
3434 | &cmd_ctx->lsm->u.context.ctx, |
3435 | kernel_poll_pipe[1]); | |
3436 | ||
3437 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
3438 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
3439 | error_add_context: | |
3440 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
3441 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
3442 | if (ret < 0) { | |
3443 | goto error; | |
3444 | } | |
54d01ffb DG |
3445 | break; |
3446 | } | |
3447 | case LTTNG_DISABLE_CHANNEL: | |
3448 | { | |
3449 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3450 | cmd_ctx->lsm->u.disable.channel_name); | |
3451 | break; | |
3452 | } | |
3453 | case LTTNG_DISABLE_EVENT: | |
3454 | { | |
47b7e2f9 JG |
3455 | |
3456 | /* | |
3457 | * FIXME: handle filter; for now we just receive the filter's | |
3458 | * bytecode along with the filter expression which are sent by | |
3459 | * liblttng-ctl and discard them. | |
3460 | * | |
3461 | * This fixes an issue where the client may block while sending | |
3462 | * the filter payload and encounter an error because the session | |
3463 | * daemon closes the socket without ever handling this data. | |
3464 | */ | |
3465 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
3466 | cmd_ctx->lsm->u.disable.bytecode_len; | |
3467 | ||
3468 | if (count) { | |
3469 | char data[LTTNG_FILTER_MAX_LEN]; | |
3470 | ||
3471 | DBG("Discarding disable event command payload of size %zu", count); | |
3472 | while (count) { | |
3473 | ret = lttcomm_recv_unix_sock(sock, data, | |
3474 | count > sizeof(data) ? sizeof(data) : count); | |
3475 | if (ret < 0) { | |
3476 | goto error; | |
3477 | } | |
3478 | ||
3479 | count -= (size_t) ret; | |
3480 | } | |
3481 | } | |
6e911cad | 3482 | /* FIXME: passing packed structure to non-packed pointer */ |
54d01ffb DG |
3483 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3484 | cmd_ctx->lsm->u.disable.channel_name, | |
6e911cad | 3485 | &cmd_ctx->lsm->u.disable.event); |
33a2b854 DG |
3486 | break; |
3487 | } | |
54d01ffb DG |
3488 | case LTTNG_ENABLE_CHANNEL: |
3489 | { | |
7972aab2 | 3490 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 3491 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
3492 | break; |
3493 | } | |
c92af2a5 | 3494 | case LTTNG_TRACK_ID: |
ccf10263 | 3495 | { |
c92af2a5 MD |
3496 | struct lttng_tracker_id id; |
3497 | ||
3498 | memset(&id, 0, sizeof(id)); | |
3499 | id.type = cmd_ctx->lsm->u.id_tracker.id_type; | |
3500 | switch (id.type) { | |
3501 | case LTTNG_ID_ALL: | |
3502 | break; | |
3503 | case LTTNG_ID_VALUE: | |
3504 | id.value = cmd_ctx->lsm->u.id_tracker.u.value; | |
3505 | break; | |
3506 | case LTTNG_ID_STRING: | |
3507 | { | |
3508 | size_t var_len = cmd_ctx->lsm->u.id_tracker.u.var_len; | |
3509 | ||
3510 | id.string = zmalloc(var_len); | |
3511 | if (!id.string) { | |
3512 | ret = LTTNG_ERR_NOMEM; | |
3513 | goto error; | |
3514 | } | |
3515 | DBG("Receiving var len tracker id string from client."); | |
3516 | ret = lttcomm_recv_unix_sock(sock, id.string, var_len); | |
3517 | if (ret <= 0) { | |
3518 | DBG("Nothing received."); | |
3519 | *sock_error = 1; | |
3520 | free(id.string); | |
3521 | ret = LTTNG_ERR_INVALID; | |
3522 | goto error; | |
3523 | } | |
3524 | if (strnlen(id.string, var_len) != var_len - 1) { | |
3525 | DBG("Corrupted string."); | |
3526 | free(id.string); | |
3527 | ret = LTTNG_ERR_INVALID; | |
3528 | goto error; | |
3529 | } | |
3530 | break; | |
3531 | } | |
3532 | default: | |
3533 | ret = LTTNG_ERR_INVALID; | |
3534 | goto error; | |
3535 | } | |
3536 | ret = cmd_track_id(cmd_ctx->session, | |
3537 | cmd_ctx->lsm->u.id_tracker.tracker_type, | |
ccf10263 | 3538 | cmd_ctx->lsm->domain.type, |
c92af2a5 | 3539 | &id); |
ccf10263 MD |
3540 | break; |
3541 | } | |
c92af2a5 | 3542 | case LTTNG_UNTRACK_ID: |
ccf10263 | 3543 | { |
c92af2a5 MD |
3544 | struct lttng_tracker_id id; |
3545 | ||
3546 | memset(&id, 0, sizeof(id)); | |
3547 | id.type = cmd_ctx->lsm->u.id_tracker.id_type; | |
3548 | switch (id.type) { | |
3549 | case LTTNG_ID_ALL: | |
3550 | break; | |
3551 | case LTTNG_ID_VALUE: | |
3552 | id.value = cmd_ctx->lsm->u.id_tracker.u.value; | |
3553 | break; | |
3554 | case LTTNG_ID_STRING: | |
3555 | { | |
3556 | size_t var_len = cmd_ctx->lsm->u.id_tracker.u.var_len; | |
3557 | ||
3558 | id.string = zmalloc(var_len); | |
3559 | if (!id.string) { | |
3560 | ret = LTTNG_ERR_NOMEM; | |
3561 | goto error; | |
3562 | } | |
3563 | DBG("Receiving var len tracker id string from client."); | |
3564 | ret = lttcomm_recv_unix_sock(sock, id.string, var_len); | |
3565 | if (ret <= 0) { | |
3566 | DBG("Nothing received."); | |
3567 | *sock_error = 1; | |
3568 | free(id.string); | |
3569 | ret = LTTNG_ERR_INVALID; | |
3570 | goto error; | |
3571 | } | |
3572 | if (strnlen(id.string, var_len) != var_len - 1) { | |
3573 | DBG("Corrupted string."); | |
3574 | free(id.string); | |
3575 | ret = LTTNG_ERR_INVALID; | |
3576 | goto error; | |
3577 | } | |
3578 | break; | |
3579 | } | |
3580 | default: | |
3581 | ret = LTTNG_ERR_INVALID; | |
3582 | goto error; | |
3583 | } | |
3584 | ret = cmd_untrack_id(cmd_ctx->session, | |
3585 | cmd_ctx->lsm->u.id_tracker.tracker_type, | |
ccf10263 | 3586 | cmd_ctx->lsm->domain.type, |
c92af2a5 | 3587 | &id); |
ccf10263 MD |
3588 | break; |
3589 | } | |
54d01ffb DG |
3590 | case LTTNG_ENABLE_EVENT: |
3591 | { | |
882ef835 JI |
3592 | struct lttng_event_exclusion *exclusion = NULL; |
3593 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3594 | char *filter_expression = NULL; |
882ef835 | 3595 | |
67676bd8 DG |
3596 | /* Handle exclusion events and receive it from the client. */ |
3597 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3598 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3599 | ||
3600 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3601 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3602 | if (!exclusion) { | |
3603 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3604 | goto error; | |
882ef835 | 3605 | } |
882ef835 | 3606 | |
67676bd8 DG |
3607 | DBG("Receiving var len exclusion event list from client ..."); |
3608 | exclusion->count = count; | |
3609 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3610 | count * LTTNG_SYMBOL_NAME_LEN); | |
3611 | if (ret <= 0) { | |
3612 | DBG("Nothing recv() from client var len data... continuing"); | |
3613 | *sock_error = 1; | |
3614 | free(exclusion); | |
3615 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3616 | goto error; | |
3617 | } | |
3618 | } | |
3619 | ||
6b453b5e JG |
3620 | /* Get filter expression from client. */ |
3621 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3622 | size_t expression_len = | |
3623 | cmd_ctx->lsm->u.enable.expression_len; | |
3624 | ||
3625 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3626 | ret = LTTNG_ERR_FILTER_INVAL; | |
3627 | free(exclusion); | |
3628 | goto error; | |
3629 | } | |
3630 | ||
3631 | filter_expression = zmalloc(expression_len); | |
3632 | if (!filter_expression) { | |
3633 | free(exclusion); | |
3634 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3635 | goto error; | |
3636 | } | |
3637 | ||
3638 | /* Receive var. len. data */ | |
3639 | DBG("Receiving var len filter's expression from client ..."); | |
3640 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3641 | expression_len); | |
3642 | if (ret <= 0) { | |
3643 | DBG("Nothing recv() from client car len data... continuing"); | |
3644 | *sock_error = 1; | |
3645 | free(filter_expression); | |
3646 | free(exclusion); | |
3647 | ret = LTTNG_ERR_FILTER_INVAL; | |
3648 | goto error; | |
3649 | } | |
3650 | } | |
3651 | ||
67676bd8 DG |
3652 | /* Handle filter and get bytecode from client. */ |
3653 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3654 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3655 | ||
3656 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3657 | ret = LTTNG_ERR_FILTER_INVAL; | |
49d21f93 | 3658 | free(filter_expression); |
67676bd8 DG |
3659 | free(exclusion); |
3660 | goto error; | |
3661 | } | |
3662 | ||
3663 | bytecode = zmalloc(bytecode_len); | |
3664 | if (!bytecode) { | |
49d21f93 | 3665 | free(filter_expression); |
67676bd8 DG |
3666 | free(exclusion); |
3667 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3668 | goto error; | |
882ef835 JI |
3669 | } |
3670 | ||
67676bd8 DG |
3671 | /* Receive var. len. data */ |
3672 | DBG("Receiving var len filter's bytecode from client ..."); | |
3673 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3674 | if (ret <= 0) { | |
3675 | DBG("Nothing recv() from client car len data... continuing"); | |
3676 | *sock_error = 1; | |
49d21f93 | 3677 | free(filter_expression); |
67676bd8 DG |
3678 | free(bytecode); |
3679 | free(exclusion); | |
3680 | ret = LTTNG_ERR_FILTER_INVAL; | |
3681 | goto error; | |
3682 | } | |
3683 | ||
3684 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
49d21f93 | 3685 | free(filter_expression); |
67676bd8 DG |
3686 | free(bytecode); |
3687 | free(exclusion); | |
3688 | ret = LTTNG_ERR_FILTER_INVAL; | |
3689 | goto error; | |
3690 | } | |
882ef835 | 3691 | } |
67676bd8 DG |
3692 | |
3693 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, | |
3694 | cmd_ctx->lsm->u.enable.channel_name, | |
6b453b5e JG |
3695 | &cmd_ctx->lsm->u.enable.event, |
3696 | filter_expression, bytecode, exclusion, | |
67676bd8 | 3697 | kernel_poll_pipe[1]); |
54d01ffb DG |
3698 | break; |
3699 | } | |
052da939 | 3700 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3701 | { |
9f19cc17 | 3702 | struct lttng_event *events; |
54d01ffb | 3703 | ssize_t nb_events; |
052da939 | 3704 | |
0845bbfa | 3705 | session_lock_list(); |
54d01ffb | 3706 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
0845bbfa | 3707 | session_unlock_list(); |
54d01ffb | 3708 | if (nb_events < 0) { |
f73fabfd | 3709 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3710 | ret = -nb_events; |
3711 | goto error; | |
2ef84c95 DG |
3712 | } |
3713 | ||
3714 | /* | |
3715 | * Setup lttng message with payload size set to the event list size in | |
3716 | * bytes and then copy list into the llm payload. | |
3717 | */ | |
6e10c9b9 PP |
3718 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3719 | sizeof(struct lttng_event) * nb_events); | |
3720 | free(events); | |
3721 | ||
2ef84c95 DG |
3722 | if (ret < 0) { |
3723 | goto setup_error; | |
3724 | } | |
3725 | ||
f73fabfd | 3726 | ret = LTTNG_OK; |
2ef84c95 DG |
3727 | break; |
3728 | } | |
f37d259d MD |
3729 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3730 | { | |
3731 | struct lttng_event_field *fields; | |
3732 | ssize_t nb_fields; | |
3733 | ||
0845bbfa | 3734 | session_lock_list(); |
a4b92340 DG |
3735 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3736 | &fields); | |
0845bbfa | 3737 | session_unlock_list(); |
f37d259d | 3738 | if (nb_fields < 0) { |
f73fabfd | 3739 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3740 | ret = -nb_fields; |
3741 | goto error; | |
3742 | } | |
3743 | ||
3744 | /* | |
3745 | * Setup lttng message with payload size set to the event list size in | |
3746 | * bytes and then copy list into the llm payload. | |
3747 | */ | |
6e10c9b9 | 3748 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
a4b92340 | 3749 | sizeof(struct lttng_event_field) * nb_fields); |
6e10c9b9 PP |
3750 | free(fields); |
3751 | ||
f37d259d | 3752 | if (ret < 0) { |
f37d259d MD |
3753 | goto setup_error; |
3754 | } | |
3755 | ||
f73fabfd | 3756 | ret = LTTNG_OK; |
f37d259d MD |
3757 | break; |
3758 | } | |
834978fd DG |
3759 | case LTTNG_LIST_SYSCALLS: |
3760 | { | |
3761 | struct lttng_event *events; | |
3762 | ssize_t nb_events; | |
3763 | ||
3764 | nb_events = cmd_list_syscalls(&events); | |
3765 | if (nb_events < 0) { | |
3766 | /* Return value is a negative lttng_error_code. */ | |
3767 | ret = -nb_events; | |
3768 | goto error; | |
3769 | } | |
3770 | ||
3771 | /* | |
3772 | * Setup lttng message with payload size set to the event list size in | |
3773 | * bytes and then copy list into the llm payload. | |
3774 | */ | |
6e10c9b9 PP |
3775 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3776 | sizeof(struct lttng_event) * nb_events); | |
3777 | free(events); | |
3778 | ||
834978fd | 3779 | if (ret < 0) { |
834978fd DG |
3780 | goto setup_error; |
3781 | } | |
3782 | ||
834978fd DG |
3783 | ret = LTTNG_OK; |
3784 | break; | |
3785 | } | |
c92af2a5 | 3786 | case LTTNG_LIST_TRACKER_IDS: |
a5dfbb9d | 3787 | { |
c92af2a5 MD |
3788 | struct lttcomm_tracker_command_header cmd_header; |
3789 | struct lttng_tracker_id *ids = NULL; | |
3790 | ssize_t nr_ids, i; | |
3791 | struct lttng_dynamic_buffer buf; | |
3792 | ||
3793 | nr_ids = cmd_list_tracker_ids(cmd_ctx->lsm->u.id_tracker.tracker_type, | |
3794 | cmd_ctx->session, | |
3795 | cmd_ctx->lsm->domain.type, &ids); | |
3796 | if (nr_ids < 0) { | |
a5dfbb9d | 3797 | /* Return value is a negative lttng_error_code. */ |
c92af2a5 | 3798 | ret = -nr_ids; |
a5dfbb9d MD |
3799 | goto error; |
3800 | } | |
3801 | ||
c92af2a5 MD |
3802 | lttng_dynamic_buffer_init(&buf); |
3803 | for (i = 0; i < nr_ids; i++) { | |
3804 | struct lttng_tracker_id *id = &ids[i]; | |
3805 | struct lttcomm_tracker_id_header id_hdr; | |
3806 | size_t var_data_len = 0; | |
3807 | ||
3808 | memset(&id_hdr, 0, sizeof(id_hdr)); | |
3809 | id_hdr.type = id->type; | |
3810 | switch (id->type) { | |
3811 | case LTTNG_ID_ALL: | |
3812 | break; | |
3813 | case LTTNG_ID_VALUE: | |
3814 | id_hdr.u.value = id->value; | |
3815 | break; | |
3816 | case LTTNG_ID_STRING: | |
3817 | id_hdr.u.var_data_len = var_data_len = strlen(id->string) + 1; | |
3818 | break; | |
3819 | default: | |
3820 | ret = LTTNG_ERR_INVALID; | |
3821 | goto error; | |
3822 | } | |
3823 | ret = lttng_dynamic_buffer_append(&buf, &id_hdr, sizeof(id_hdr)); | |
3824 | if (ret) { | |
3825 | ret = LTTNG_ERR_NOMEM; | |
3826 | goto error; | |
3827 | } | |
3828 | ret = lttng_dynamic_buffer_append(&buf, id->string, var_data_len); | |
3829 | if (ret) { | |
3830 | ret = LTTNG_ERR_NOMEM; | |
3831 | goto error; | |
3832 | } | |
3833 | } | |
6e10c9b9 | 3834 | |
c92af2a5 MD |
3835 | cmd_header.nb_tracker_id = nr_ids; |
3836 | ret = setup_lttng_msg(cmd_ctx, buf.data, buf.size, &cmd_header, | |
3837 | sizeof(cmd_header)); | |
3838 | free(ids); | |
3839 | lttng_dynamic_buffer_reset(&buf); | |
a5dfbb9d | 3840 | if (ret < 0) { |
a5dfbb9d MD |
3841 | goto setup_error; |
3842 | } | |
3843 | ||
a5dfbb9d MD |
3844 | ret = LTTNG_OK; |
3845 | break; | |
3846 | } | |
00e2e675 DG |
3847 | case LTTNG_SET_CONSUMER_URI: |
3848 | { | |
a4b92340 DG |
3849 | size_t nb_uri, len; |
3850 | struct lttng_uri *uris; | |
3851 | ||
3852 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3853 | len = nb_uri * sizeof(struct lttng_uri); | |
3854 | ||
3855 | if (nb_uri == 0) { | |
f73fabfd | 3856 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3857 | goto error; |
3858 | } | |
3859 | ||
3860 | uris = zmalloc(len); | |
3861 | if (uris == NULL) { | |
f73fabfd | 3862 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3863 | goto error; |
3864 | } | |
3865 | ||
3866 | /* Receive variable len data */ | |
77c7c900 | 3867 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3868 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3869 | if (ret <= 0) { | |
3870 | DBG("No URIs received from client... continuing"); | |
3871 | *sock_error = 1; | |
f73fabfd | 3872 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3873 | free(uris); |
a4b92340 DG |
3874 | goto error; |
3875 | } | |
3876 | ||
bda32d56 JG |
3877 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
3878 | free(uris); | |
f73fabfd | 3879 | if (ret != LTTNG_OK) { |
a4b92340 DG |
3880 | goto error; |
3881 | } | |
3882 | ||
b1d41407 | 3883 | |
00e2e675 DG |
3884 | break; |
3885 | } | |
f3ed775e | 3886 | case LTTNG_START_TRACE: |
8c0faa1d | 3887 | { |
54d01ffb | 3888 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3889 | break; |
3890 | } | |
f3ed775e | 3891 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3892 | { |
54d01ffb | 3893 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3894 | break; |
3895 | } | |
5e16da05 MD |
3896 | case LTTNG_CREATE_SESSION: |
3897 | { | |
a4b92340 DG |
3898 | size_t nb_uri, len; |
3899 | struct lttng_uri *uris = NULL; | |
3900 | ||
3901 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3902 | len = nb_uri * sizeof(struct lttng_uri); | |
3903 | ||
3904 | if (nb_uri > 0) { | |
3905 | uris = zmalloc(len); | |
3906 | if (uris == NULL) { | |
f73fabfd | 3907 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3908 | goto error; |
3909 | } | |
3910 | ||
3911 | /* Receive variable len data */ | |
77c7c900 | 3912 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3913 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3914 | if (ret <= 0) { | |
3915 | DBG("No URIs received from client... continuing"); | |
3916 | *sock_error = 1; | |
f73fabfd | 3917 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3918 | free(uris); |
a4b92340 DG |
3919 | goto error; |
3920 | } | |
3921 | ||
3922 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3923 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3924 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3925 | free(uris); |
a4b92340 DG |
3926 | goto error; |
3927 | } | |
3928 | } | |
3929 | ||
3930 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3931 | &cmd_ctx->creds, 0); |
a4b92340 | 3932 | |
b1d41407 DG |
3933 | free(uris); |
3934 | ||
00e2e675 DG |
3935 | break; |
3936 | } | |
5e16da05 MD |
3937 | case LTTNG_DESTROY_SESSION: |
3938 | { | |
2f77fc4b | 3939 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3940 | |
3941 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3942 | cmd_ctx->session = NULL; |
5461b305 | 3943 | break; |
5e16da05 | 3944 | } |
9f19cc17 | 3945 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3946 | { |
54d01ffb | 3947 | ssize_t nb_dom; |
fa64dfb4 | 3948 | struct lttng_domain *domains = NULL; |
5461b305 | 3949 | |
54d01ffb DG |
3950 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3951 | if (nb_dom < 0) { | |
f73fabfd | 3952 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3953 | ret = -nb_dom; |
3954 | goto error; | |
ce3d728c | 3955 | } |
520ff687 | 3956 | |
6e10c9b9 PP |
3957 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
3958 | nb_dom * sizeof(struct lttng_domain)); | |
3959 | free(domains); | |
3960 | ||
5461b305 DG |
3961 | if (ret < 0) { |
3962 | goto setup_error; | |
520ff687 | 3963 | } |
57167058 | 3964 | |
f73fabfd | 3965 | ret = LTTNG_OK; |
5e16da05 MD |
3966 | break; |
3967 | } | |
9f19cc17 | 3968 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3969 | { |
53e367f9 | 3970 | ssize_t payload_size; |
ade7ce52 | 3971 | struct lttng_channel *channels = NULL; |
54d01ffb | 3972 | |
53e367f9 | 3973 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
b551a063 | 3974 | cmd_ctx->session, &channels); |
53e367f9 | 3975 | if (payload_size < 0) { |
f73fabfd | 3976 | /* Return value is a negative lttng_error_code. */ |
53e367f9 | 3977 | ret = -payload_size; |
54d01ffb | 3978 | goto error; |
5461b305 | 3979 | } |
ca95a216 | 3980 | |
6e10c9b9 | 3981 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
53e367f9 | 3982 | payload_size); |
6e10c9b9 PP |
3983 | free(channels); |
3984 | ||
5461b305 DG |
3985 | if (ret < 0) { |
3986 | goto setup_error; | |
3987 | } | |
9f19cc17 | 3988 | |
f73fabfd | 3989 | ret = LTTNG_OK; |
5461b305 | 3990 | break; |
5e16da05 | 3991 | } |
9f19cc17 | 3992 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3993 | { |
b551a063 | 3994 | ssize_t nb_event; |
684d34d2 | 3995 | struct lttng_event *events = NULL; |
b4e3ceb9 PP |
3996 | struct lttcomm_event_command_header cmd_header; |
3997 | size_t total_size; | |
3998 | ||
b2d66287 | 3999 | memset(&cmd_header, 0, sizeof(cmd_header)); |
b4e3ceb9 PP |
4000 | /* Extended infos are included at the end of events */ |
4001 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
4002 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
4003 | &events, &total_size); | |
9f19cc17 | 4004 | |
54d01ffb | 4005 | if (nb_event < 0) { |
f73fabfd | 4006 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
4007 | ret = -nb_event; |
4008 | goto error; | |
5461b305 | 4009 | } |
ca95a216 | 4010 | |
b4e3ceb9 PP |
4011 | cmd_header.nb_events = nb_event; |
4012 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
4013 | &cmd_header, sizeof(cmd_header)); | |
6e10c9b9 PP |
4014 | free(events); |
4015 | ||
5461b305 DG |
4016 | if (ret < 0) { |
4017 | goto setup_error; | |
4018 | } | |
9f19cc17 | 4019 | |
f73fabfd | 4020 | ret = LTTNG_OK; |
5461b305 | 4021 | break; |
5e16da05 MD |
4022 | } |
4023 | case LTTNG_LIST_SESSIONS: | |
4024 | { | |
8e0af1b4 | 4025 | unsigned int nr_sessions; |
6e10c9b9 PP |
4026 | void *sessions_payload; |
4027 | size_t payload_len; | |
5461b305 | 4028 | |
8e0af1b4 | 4029 | session_lock_list(); |
730389d9 DG |
4030 | nr_sessions = lttng_sessions_count( |
4031 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
4032 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6e10c9b9 PP |
4033 | payload_len = sizeof(struct lttng_session) * nr_sessions; |
4034 | sessions_payload = zmalloc(payload_len); | |
d32fb093 | 4035 | |
6e10c9b9 | 4036 | if (!sessions_payload) { |
54d01ffb | 4037 | session_unlock_list(); |
6e10c9b9 | 4038 | ret = -ENOMEM; |
5461b305 | 4039 | goto setup_error; |
e065084a | 4040 | } |
5e16da05 | 4041 | |
6e10c9b9 | 4042 | cmd_list_lttng_sessions(sessions_payload, |
730389d9 DG |
4043 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
4044 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
54d01ffb | 4045 | session_unlock_list(); |
5e16da05 | 4046 | |
6e10c9b9 PP |
4047 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
4048 | payload_len); | |
4049 | free(sessions_payload); | |
4050 | ||
4051 | if (ret < 0) { | |
4052 | goto setup_error; | |
4053 | } | |
4054 | ||
f73fabfd | 4055 | ret = LTTNG_OK; |
5e16da05 MD |
4056 | break; |
4057 | } | |
d9800920 DG |
4058 | case LTTNG_REGISTER_CONSUMER: |
4059 | { | |
2f77fc4b DG |
4060 | struct consumer_data *cdata; |
4061 | ||
4062 | switch (cmd_ctx->lsm->domain.type) { | |
4063 | case LTTNG_DOMAIN_KERNEL: | |
4064 | cdata = &kconsumer_data; | |
4065 | break; | |
4066 | default: | |
f73fabfd | 4067 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
4068 | goto error; |
4069 | } | |
4070 | ||
54d01ffb | 4071 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 4072 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
4073 | break; |
4074 | } | |
6d805429 | 4075 | case LTTNG_DATA_PENDING: |
806e2684 | 4076 | { |
f6151c55 | 4077 | int pending_ret; |
6e10c9b9 | 4078 | uint8_t pending_ret_byte; |
f6151c55 JG |
4079 | |
4080 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
6e10c9b9 | 4081 | |
f6151c55 JG |
4082 | /* |
4083 | * FIXME | |
4084 | * | |
4085 | * This function may returns 0 or 1 to indicate whether or not | |
4086 | * there is data pending. In case of error, it should return an | |
4087 | * LTTNG_ERR code. However, some code paths may still return | |
4088 | * a nondescript error code, which we handle by returning an | |
4089 | * "unknown" error. | |
4090 | */ | |
4091 | if (pending_ret == 0 || pending_ret == 1) { | |
6e10c9b9 PP |
4092 | /* |
4093 | * ret will be set to LTTNG_OK at the end of | |
4094 | * this function. | |
4095 | */ | |
f6151c55 JG |
4096 | } else if (pending_ret < 0) { |
4097 | ret = LTTNG_ERR_UNK; | |
4098 | goto setup_error; | |
4099 | } else { | |
4100 | ret = pending_ret; | |
4101 | goto setup_error; | |
4102 | } | |
4103 | ||
6e10c9b9 PP |
4104 | pending_ret_byte = (uint8_t) pending_ret; |
4105 | ||
4106 | /* 1 byte to return whether or not data is pending */ | |
4107 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
4108 | &pending_ret_byte, 1); | |
4109 | ||
4110 | if (ret < 0) { | |
4111 | goto setup_error; | |
4112 | } | |
4113 | ||
4114 | ret = LTTNG_OK; | |
806e2684 DG |
4115 | break; |
4116 | } | |
da3c9ec1 DG |
4117 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
4118 | { | |
6dc3064a DG |
4119 | struct lttcomm_lttng_output_id reply; |
4120 | ||
4121 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
4122 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
4123 | if (ret != LTTNG_OK) { | |
4124 | goto error; | |
4125 | } | |
4126 | ||
6e10c9b9 PP |
4127 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
4128 | sizeof(reply)); | |
6dc3064a DG |
4129 | if (ret < 0) { |
4130 | goto setup_error; | |
4131 | } | |
4132 | ||
4133 | /* Copy output list into message payload */ | |
6dc3064a | 4134 | ret = LTTNG_OK; |
da3c9ec1 DG |
4135 | break; |
4136 | } | |
4137 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
4138 | { | |
6dc3064a DG |
4139 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
4140 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
4141 | break; |
4142 | } | |
4143 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
4144 | { | |
6dc3064a DG |
4145 | ssize_t nb_output; |
4146 | struct lttng_snapshot_output *outputs = NULL; | |
4147 | ||
4148 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
4149 | if (nb_output < 0) { | |
4150 | ret = -nb_output; | |
4151 | goto error; | |
4152 | } | |
4153 | ||
6e10c9b9 PP |
4154 | assert((nb_output > 0 && outputs) || nb_output == 0); |
4155 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
6dc3064a | 4156 | nb_output * sizeof(struct lttng_snapshot_output)); |
6e10c9b9 PP |
4157 | free(outputs); |
4158 | ||
6dc3064a | 4159 | if (ret < 0) { |
6dc3064a DG |
4160 | goto setup_error; |
4161 | } | |
4162 | ||
6dc3064a | 4163 | ret = LTTNG_OK; |
da3c9ec1 DG |
4164 | break; |
4165 | } | |
4166 | case LTTNG_SNAPSHOT_RECORD: | |
4167 | { | |
6dc3064a DG |
4168 | ret = cmd_snapshot_record(cmd_ctx->session, |
4169 | &cmd_ctx->lsm->u.snapshot_record.output, | |
4170 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
4171 | break; |
4172 | } | |
27babd3a DG |
4173 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
4174 | { | |
4175 | size_t nb_uri, len; | |
4176 | struct lttng_uri *uris = NULL; | |
4177 | ||
4178 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4179 | len = nb_uri * sizeof(struct lttng_uri); | |
4180 | ||
4181 | if (nb_uri > 0) { | |
4182 | uris = zmalloc(len); | |
4183 | if (uris == NULL) { | |
4184 | ret = LTTNG_ERR_FATAL; | |
4185 | goto error; | |
4186 | } | |
4187 | ||
4188 | /* Receive variable len data */ | |
4189 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4190 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4191 | if (ret <= 0) { | |
4192 | DBG("No URIs received from client... continuing"); | |
4193 | *sock_error = 1; | |
4194 | ret = LTTNG_ERR_SESSION_FAIL; | |
4195 | free(uris); | |
4196 | goto error; | |
4197 | } | |
4198 | ||
4199 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4200 | DBG("Creating session with ONE network URI is a bad call"); | |
4201 | ret = LTTNG_ERR_SESSION_FAIL; | |
4202 | free(uris); | |
4203 | goto error; | |
4204 | } | |
4205 | } | |
4206 | ||
4207 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
4208 | nb_uri, &cmd_ctx->creds); | |
4209 | free(uris); | |
4210 | break; | |
4211 | } | |
ecc48a90 JD |
4212 | case LTTNG_CREATE_SESSION_LIVE: |
4213 | { | |
4214 | size_t nb_uri, len; | |
4215 | struct lttng_uri *uris = NULL; | |
4216 | ||
4217 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4218 | len = nb_uri * sizeof(struct lttng_uri); | |
4219 | ||
4220 | if (nb_uri > 0) { | |
4221 | uris = zmalloc(len); | |
4222 | if (uris == NULL) { | |
4223 | ret = LTTNG_ERR_FATAL; | |
4224 | goto error; | |
4225 | } | |
4226 | ||
4227 | /* Receive variable len data */ | |
4228 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4229 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4230 | if (ret <= 0) { | |
4231 | DBG("No URIs received from client... continuing"); | |
4232 | *sock_error = 1; | |
4233 | ret = LTTNG_ERR_SESSION_FAIL; | |
4234 | free(uris); | |
4235 | goto error; | |
4236 | } | |
4237 | ||
4238 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4239 | DBG("Creating session with ONE network URI is a bad call"); | |
4240 | ret = LTTNG_ERR_SESSION_FAIL; | |
4241 | free(uris); | |
4242 | goto error; | |
4243 | } | |
4244 | } | |
4245 | ||
4246 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
4247 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
4248 | free(uris); | |
4249 | break; | |
4250 | } | |
fb198a11 JG |
4251 | case LTTNG_SAVE_SESSION: |
4252 | { | |
4253 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
4254 | &cmd_ctx->creds); | |
4255 | break; | |
4256 | } | |
d7ba1388 MD |
4257 | case LTTNG_SET_SESSION_SHM_PATH: |
4258 | { | |
4259 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
4260 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
4261 | break; | |
4262 | } | |
eded6438 | 4263 | case LTTNG_REGENERATE_METADATA: |
93ec662e | 4264 | { |
eded6438 | 4265 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
93ec662e JD |
4266 | break; |
4267 | } | |
c2561365 JD |
4268 | case LTTNG_REGENERATE_STATEDUMP: |
4269 | { | |
4270 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
4271 | break; | |
4272 | } | |
5e16da05 | 4273 | default: |
f73fabfd | 4274 | ret = LTTNG_ERR_UND; |
5461b305 | 4275 | break; |
fac6795d DG |
4276 | } |
4277 | ||
5461b305 | 4278 | error: |
5461b305 DG |
4279 | if (cmd_ctx->llm == NULL) { |
4280 | DBG("Missing llm structure. Allocating one."); | |
6e10c9b9 | 4281 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
5461b305 DG |
4282 | goto setup_error; |
4283 | } | |
4284 | } | |
54d01ffb | 4285 | /* Set return code */ |
5461b305 | 4286 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 4287 | setup_error: |
b5541356 | 4288 | if (cmd_ctx->session) { |
54d01ffb | 4289 | session_unlock(cmd_ctx->session); |
b5541356 | 4290 | } |
256a5576 MD |
4291 | if (need_tracing_session) { |
4292 | session_unlock_list(); | |
4293 | } | |
54d01ffb | 4294 | init_setup_error: |
3745d315 | 4295 | assert(!rcu_read_ongoing()); |
8028d920 | 4296 | return ret; |
fac6795d DG |
4297 | } |
4298 | ||
44a5e5eb DG |
4299 | /* |
4300 | * Thread managing health check socket. | |
4301 | */ | |
4302 | static void *thread_manage_health(void *data) | |
4303 | { | |
eb4a2943 | 4304 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
4305 | uint32_t revents, nb_fd; |
4306 | struct lttng_poll_event events; | |
0c89d795 MD |
4307 | struct health_comm_msg msg; |
4308 | struct health_comm_reply reply; | |
44a5e5eb DG |
4309 | |
4310 | DBG("[thread] Manage health check started"); | |
4311 | ||
4312 | rcu_register_thread(); | |
4313 | ||
6d737ce4 DG |
4314 | /* We might hit an error path before this is created. */ |
4315 | lttng_poll_init(&events); | |
3cc04881 | 4316 | |
44a5e5eb DG |
4317 | /* Create unix socket */ |
4318 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
4319 | if (sock < 0) { | |
4320 | ERR("Unable to create health check Unix socket"); | |
44a5e5eb DG |
4321 | goto error; |
4322 | } | |
4323 | ||
6c71277b MD |
4324 | if (is_root) { |
4325 | /* lttng health client socket path permissions */ | |
4326 | ret = chown(health_unix_sock_path, 0, | |
4327 | utils_get_group_id(tracing_group_name)); | |
4328 | if (ret < 0) { | |
4329 | ERR("Unable to set group on %s", health_unix_sock_path); | |
4330 | PERROR("chown"); | |
6c71277b MD |
4331 | goto error; |
4332 | } | |
4333 | ||
4334 | ret = chmod(health_unix_sock_path, | |
4335 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4336 | if (ret < 0) { | |
4337 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
4338 | PERROR("chmod"); | |
6c71277b MD |
4339 | goto error; |
4340 | } | |
4341 | } | |
4342 | ||
b662582b DG |
4343 | /* |
4344 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4345 | * show must go on. | |
4346 | */ | |
4347 | (void) utils_set_fd_cloexec(sock); | |
4348 | ||
44a5e5eb DG |
4349 | ret = lttcomm_listen_unix_sock(sock); |
4350 | if (ret < 0) { | |
4351 | goto error; | |
4352 | } | |
4353 | ||
4354 | /* | |
4355 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4356 | * more will be added to this poll set. | |
4357 | */ | |
d0b96690 | 4358 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
4359 | if (ret < 0) { |
4360 | goto error; | |
4361 | } | |
4362 | ||
4363 | /* Add the application registration socket */ | |
4364 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
4365 | if (ret < 0) { | |
4366 | goto error; | |
4367 | } | |
4368 | ||
ef367a93 | 4369 | sessiond_notify_ready(); |
97bc1426 | 4370 | |
44a5e5eb DG |
4371 | while (1) { |
4372 | DBG("Health check ready"); | |
4373 | ||
44a5e5eb DG |
4374 | /* Inifinite blocking call, waiting for transmission */ |
4375 | restart: | |
4376 | ret = lttng_poll_wait(&events, -1); | |
4377 | if (ret < 0) { | |
4378 | /* | |
4379 | * Restart interrupted system call. | |
4380 | */ | |
4381 | if (errno == EINTR) { | |
4382 | goto restart; | |
4383 | } | |
4384 | goto error; | |
4385 | } | |
4386 | ||
0d9c5d77 DG |
4387 | nb_fd = ret; |
4388 | ||
44a5e5eb DG |
4389 | for (i = 0; i < nb_fd; i++) { |
4390 | /* Fetch once the poll data */ | |
4391 | revents = LTTNG_POLL_GETEV(&events, i); | |
4392 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4393 | ||
fd20dac9 MD |
4394 | if (!revents) { |
4395 | /* No activity for this FD (poll implementation). */ | |
4396 | continue; | |
4397 | } | |
4398 | ||
44a5e5eb | 4399 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4400 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 4401 | if (ret) { |
139ac872 MD |
4402 | err = 0; |
4403 | goto exit; | |
44a5e5eb DG |
4404 | } |
4405 | ||
4406 | /* Event on the registration socket */ | |
4407 | if (pollfd == sock) { | |
03e43155 MD |
4408 | if (revents & LPOLLIN) { |
4409 | continue; | |
4410 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
44a5e5eb DG |
4411 | ERR("Health socket poll error"); |
4412 | goto error; | |
03e43155 MD |
4413 | } else { |
4414 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4415 | goto error; | |
44a5e5eb DG |
4416 | } |
4417 | } | |
4418 | } | |
4419 | ||
4420 | new_sock = lttcomm_accept_unix_sock(sock); | |
4421 | if (new_sock < 0) { | |
4422 | goto error; | |
4423 | } | |
4424 | ||
b662582b DG |
4425 | /* |
4426 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4427 | * show must go on. | |
4428 | */ | |
4429 | (void) utils_set_fd_cloexec(new_sock); | |
4430 | ||
44a5e5eb DG |
4431 | DBG("Receiving data from client for health..."); |
4432 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
4433 | if (ret <= 0) { | |
4434 | DBG("Nothing recv() from client... continuing"); | |
4435 | ret = close(new_sock); | |
4436 | if (ret) { | |
4437 | PERROR("close"); | |
4438 | } | |
44a5e5eb DG |
4439 | continue; |
4440 | } | |
4441 | ||
4442 | rcu_thread_online(); | |
4443 | ||
53efb85a | 4444 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
4445 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
4446 | /* | |
4447 | * health_check_state returns 0 if health is | |
4448 | * bad. | |
4449 | */ | |
4450 | if (!health_check_state(health_sessiond, i)) { | |
4451 | reply.ret_code |= 1ULL << i; | |
4452 | } | |
44a5e5eb DG |
4453 | } |
4454 | ||
6c71277b | 4455 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
4456 | |
4457 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
4458 | if (ret < 0) { | |
4459 | ERR("Failed to send health data back to client"); | |
4460 | } | |
4461 | ||
4462 | /* End of transmission */ | |
4463 | ret = close(new_sock); | |
4464 | if (ret) { | |
4465 | PERROR("close"); | |
4466 | } | |
44a5e5eb DG |
4467 | } |
4468 | ||
139ac872 | 4469 | exit: |
44a5e5eb | 4470 | error: |
139ac872 MD |
4471 | if (err) { |
4472 | ERR("Health error occurred in %s", __func__); | |
4473 | } | |
44a5e5eb DG |
4474 | DBG("Health check thread dying"); |
4475 | unlink(health_unix_sock_path); | |
4476 | if (sock >= 0) { | |
4477 | ret = close(sock); | |
4478 | if (ret) { | |
4479 | PERROR("close"); | |
4480 | } | |
4481 | } | |
44a5e5eb DG |
4482 | |
4483 | lttng_poll_clean(&events); | |
28538a70 | 4484 | stop_threads(); |
44a5e5eb DG |
4485 | rcu_unregister_thread(); |
4486 | return NULL; | |
4487 | } | |
4488 | ||
1d4b027a | 4489 | /* |
d063d709 DG |
4490 | * This thread manage all clients request using the unix client socket for |
4491 | * communication. | |
1d4b027a DG |
4492 | */ |
4493 | static void *thread_manage_clients(void *data) | |
4494 | { | |
139ac872 | 4495 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 4496 | int sock_error; |
5eb91c98 | 4497 | uint32_t revents, nb_fd; |
273ea72c | 4498 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4499 | struct lttng_poll_event events; |
1d4b027a DG |
4500 | |
4501 | DBG("[thread] Manage client started"); | |
4502 | ||
f6a9efaa DG |
4503 | rcu_register_thread(); |
4504 | ||
6c71277b | 4505 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 4506 | |
840cb59c | 4507 | health_code_update(); |
44a5e5eb | 4508 | |
1d4b027a DG |
4509 | ret = lttcomm_listen_unix_sock(client_sock); |
4510 | if (ret < 0) { | |
35df2755 | 4511 | goto error_listen; |
1d4b027a DG |
4512 | } |
4513 | ||
5eb91c98 DG |
4514 | /* |
4515 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4516 | * more will be added to this poll set. | |
4517 | */ | |
d0b96690 | 4518 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 4519 | if (ret < 0) { |
35df2755 | 4520 | goto error_create_poll; |
5eb91c98 | 4521 | } |
273ea72c | 4522 | |
5eb91c98 DG |
4523 | /* Add the application registration socket */ |
4524 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4525 | if (ret < 0) { | |
4526 | goto error; | |
4527 | } | |
273ea72c | 4528 | |
ef367a93 JG |
4529 | ret = sem_post(&load_info->message_thread_ready); |
4530 | if (ret) { | |
4531 | PERROR("sem_post message_thread_ready"); | |
4532 | goto error; | |
4533 | } | |
0bb7724a | 4534 | |
09a88287 JG |
4535 | /* |
4536 | * Wait until all support threads are initialized before accepting | |
4537 | * commands. | |
4538 | */ | |
4539 | while (uatomic_read(<tng_sessiond_ready) != 0) { | |
4540 | fd_set read_fds; | |
4541 | struct timeval timeout; | |
4542 | ||
4543 | FD_ZERO(&read_fds); | |
4544 | FD_SET(thread_quit_pipe[0], &read_fds); | |
4545 | memset(&timeout, 0, sizeof(timeout)); | |
4546 | timeout.tv_usec = 1000; | |
4547 | ||
4548 | /* | |
4549 | * If a support thread failed to launch, it may signal that | |
4550 | * we must exit and the sessiond would never be marked as | |
4551 | * "ready". | |
4552 | * | |
4553 | * The timeout is set to 1ms, which serves as a way to | |
4554 | * pace down this check. | |
4555 | */ | |
4556 | ret = select(thread_quit_pipe[0] + 1, &read_fds, NULL, NULL, | |
4557 | &timeout); | |
4558 | if (ret > 0 || (ret < 0 && errno != EINTR)) { | |
4559 | goto exit; | |
4560 | } | |
4561 | } | |
70a71a41 JG |
4562 | /* |
4563 | * This barrier is paired with the one in sessiond_notify_ready() to | |
4564 | * ensure that loads accessing data initialized by the other threads, | |
4565 | * on which this thread was waiting, are not performed before this point. | |
4566 | * | |
4567 | * Note that this could be a 'read' memory barrier, but a full barrier | |
4568 | * is used in case the code changes. The performance implications of | |
4569 | * this choice are minimal since this is a slow path. | |
4570 | */ | |
4571 | cmm_smp_mb(); | |
09a88287 | 4572 | |
72453c8c MD |
4573 | /* This testpoint is after we signal readiness to the parent. */ |
4574 | if (testpoint(sessiond_thread_manage_clients)) { | |
4575 | goto error; | |
4576 | } | |
4577 | ||
e547b070 | 4578 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
4579 | goto error; |
4580 | } | |
8ac94142 | 4581 | |
840cb59c | 4582 | health_code_update(); |
44a5e5eb | 4583 | |
1d4b027a | 4584 | while (1) { |
1d4b027a | 4585 | DBG("Accepting client command ..."); |
273ea72c DG |
4586 | |
4587 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 4588 | restart: |
a78af745 | 4589 | health_poll_entry(); |
5eb91c98 | 4590 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 4591 | health_poll_exit(); |
273ea72c | 4592 | if (ret < 0) { |
88f2b785 MD |
4593 | /* |
4594 | * Restart interrupted system call. | |
4595 | */ | |
4596 | if (errno == EINTR) { | |
4597 | goto restart; | |
4598 | } | |
273ea72c DG |
4599 | goto error; |
4600 | } | |
4601 | ||
0d9c5d77 DG |
4602 | nb_fd = ret; |
4603 | ||
5eb91c98 DG |
4604 | for (i = 0; i < nb_fd; i++) { |
4605 | /* Fetch once the poll data */ | |
4606 | revents = LTTNG_POLL_GETEV(&events, i); | |
4607 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4608 | ||
840cb59c | 4609 | health_code_update(); |
44a5e5eb | 4610 | |
fd20dac9 MD |
4611 | if (!revents) { |
4612 | /* No activity for this FD (poll implementation). */ | |
4613 | continue; | |
4614 | } | |
4615 | ||
5eb91c98 | 4616 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4617 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 4618 | if (ret) { |
139ac872 MD |
4619 | err = 0; |
4620 | goto exit; | |
5eb91c98 DG |
4621 | } |
4622 | ||
4623 | /* Event on the registration socket */ | |
4624 | if (pollfd == client_sock) { | |
03e43155 MD |
4625 | if (revents & LPOLLIN) { |
4626 | continue; | |
4627 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
5eb91c98 DG |
4628 | ERR("Client socket poll error"); |
4629 | goto error; | |
03e43155 MD |
4630 | } else { |
4631 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4632 | goto error; | |
5eb91c98 DG |
4633 | } |
4634 | } | |
4635 | } | |
4636 | ||
4637 | DBG("Wait for client response"); | |
4638 | ||
840cb59c | 4639 | health_code_update(); |
44a5e5eb | 4640 | |
5eb91c98 DG |
4641 | sock = lttcomm_accept_unix_sock(client_sock); |
4642 | if (sock < 0) { | |
273ea72c | 4643 | goto error; |
273ea72c DG |
4644 | } |
4645 | ||
b662582b DG |
4646 | /* |
4647 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4648 | * show must go on. | |
4649 | */ | |
4650 | (void) utils_set_fd_cloexec(sock); | |
4651 | ||
be040666 DG |
4652 | /* Set socket option for credentials retrieval */ |
4653 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4654 | if (ret < 0) { | |
4655 | goto error; | |
4656 | } | |
4657 | ||
5eb91c98 | 4658 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4659 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4660 | if (cmd_ctx == NULL) { |
76d7553f | 4661 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4662 | goto error; |
5eb91c98 | 4663 | } |
1d4b027a | 4664 | |
5eb91c98 | 4665 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4666 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4667 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4668 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4669 | goto error; |
4670 | } | |
1d4b027a | 4671 | |
5eb91c98 DG |
4672 | cmd_ctx->llm = NULL; |
4673 | cmd_ctx->session = NULL; | |
1d4b027a | 4674 | |
840cb59c | 4675 | health_code_update(); |
44a5e5eb | 4676 | |
5eb91c98 DG |
4677 | /* |
4678 | * Data is received from the lttng client. The struct | |
4679 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4680 | * the client. | |
4681 | */ | |
4682 | DBG("Receiving data from client ..."); | |
be040666 DG |
4683 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4684 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4685 | if (ret <= 0) { |
4686 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4687 | ret = close(sock); |
4688 | if (ret) { | |
4689 | PERROR("close"); | |
4690 | } | |
4691 | sock = -1; | |
a2c0da86 | 4692 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4693 | continue; |
4694 | } | |
1d4b027a | 4695 | |
840cb59c | 4696 | health_code_update(); |
44a5e5eb | 4697 | |
5eb91c98 DG |
4698 | // TODO: Validate cmd_ctx including sanity check for |
4699 | // security purpose. | |
f7776ea7 | 4700 | |
f6a9efaa | 4701 | rcu_thread_online(); |
5eb91c98 DG |
4702 | /* |
4703 | * This function dispatch the work to the kernel or userspace tracer | |
4704 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4705 | * informations for the client. The command context struct contains | |
4706 | * everything this function may needs. | |
4707 | */ | |
53a80697 | 4708 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4709 | rcu_thread_offline(); |
5eb91c98 | 4710 | if (ret < 0) { |
36134aa1 DG |
4711 | ret = close(sock); |
4712 | if (ret) { | |
4713 | PERROR("close"); | |
53a80697 | 4714 | } |
36134aa1 | 4715 | sock = -1; |
bbd973c2 | 4716 | /* |
5eb91c98 | 4717 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4718 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4719 | * (ENOMEM). Error detected but still accept |
4720 | * command, unless a socket error has been | |
4721 | * detected. | |
bbd973c2 | 4722 | */ |
bbd973c2 | 4723 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4724 | continue; |
4725 | } | |
d6e4fca4 | 4726 | |
840cb59c | 4727 | health_code_update(); |
44a5e5eb | 4728 | |
a1ac8b97 | 4729 | DBG("Sending response (size: %d, retcode: %s (%d))", |
54d01ffb | 4730 | cmd_ctx->lttng_msg_size, |
a1ac8b97 JG |
4731 | lttng_strerror(-cmd_ctx->llm->ret_code), |
4732 | cmd_ctx->llm->ret_code); | |
54d01ffb | 4733 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4734 | if (ret < 0) { |
4735 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4736 | } |
1d4b027a | 4737 | |
5eb91c98 | 4738 | /* End of transmission */ |
76d7553f MD |
4739 | ret = close(sock); |
4740 | if (ret) { | |
4741 | PERROR("close"); | |
4742 | } | |
4743 | sock = -1; | |
be040666 DG |
4744 | |
4745 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4746 | |
840cb59c | 4747 | health_code_update(); |
273ea72c DG |
4748 | } |
4749 | ||
139ac872 | 4750 | exit: |
5eb91c98 | 4751 | error: |
35df2755 CB |
4752 | if (sock >= 0) { |
4753 | ret = close(sock); | |
4754 | if (ret) { | |
4755 | PERROR("close"); | |
4756 | } | |
139ac872 | 4757 | } |
44a5e5eb | 4758 | |
35df2755 CB |
4759 | lttng_poll_clean(&events); |
4760 | clean_command_ctx(&cmd_ctx); | |
4761 | ||
4762 | error_listen: | |
4763 | error_create_poll: | |
273ea72c | 4764 | unlink(client_unix_sock_path); |
76d7553f MD |
4765 | if (client_sock >= 0) { |
4766 | ret = close(client_sock); | |
4767 | if (ret) { | |
4768 | PERROR("close"); | |
4769 | } | |
a4b35e07 | 4770 | } |
35df2755 CB |
4771 | |
4772 | if (err) { | |
840cb59c | 4773 | health_error(); |
35df2755 | 4774 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4775 | } |
273ea72c | 4776 | |
8782cc74 | 4777 | health_unregister(health_sessiond); |
35df2755 CB |
4778 | |
4779 | DBG("Client thread dying"); | |
f6a9efaa DG |
4780 | |
4781 | rcu_unregister_thread(); | |
4a15001e MD |
4782 | |
4783 | /* | |
4784 | * Since we are creating the consumer threads, we own them, so we need | |
4785 | * to join them before our thread exits. | |
4786 | */ | |
4787 | ret = join_consumer_thread(&kconsumer_data); | |
4788 | if (ret) { | |
4789 | errno = ret; | |
4790 | PERROR("join_consumer"); | |
4791 | } | |
4792 | ||
4793 | ret = join_consumer_thread(&ustconsumer32_data); | |
4794 | if (ret) { | |
4795 | errno = ret; | |
4796 | PERROR("join_consumer ust32"); | |
4797 | } | |
4798 | ||
4799 | ret = join_consumer_thread(&ustconsumer64_data); | |
4800 | if (ret) { | |
4801 | errno = ret; | |
4802 | PERROR("join_consumer ust64"); | |
4803 | } | |
1d4b027a DG |
4804 | return NULL; |
4805 | } | |
4806 | ||
c0232ea5 JG |
4807 | static int string_match(const char *str1, const char *str2) |
4808 | { | |
4809 | return (str1 && str2) && !strcmp(str1, str2); | |
4810 | } | |
4811 | ||
fac6795d | 4812 | /* |
26296c48 JG |
4813 | * Take an option from the getopt output and set it in the right variable to be |
4814 | * used later. | |
4815 | * | |
4816 | * Return 0 on success else a negative value. | |
fac6795d | 4817 | */ |
26296c48 | 4818 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4819 | { |
26296c48 | 4820 | int ret = 0; |
fac6795d | 4821 | |
c0232ea5 | 4822 | if (string_match(optname, "client-sock") || opt == 'c') { |
66b2ce8e JG |
4823 | if (!arg || *arg == '\0') { |
4824 | ret = -EINVAL; | |
4825 | goto end; | |
4826 | } | |
e8fa9fb0 MD |
4827 | if (lttng_is_setuid_setgid()) { |
4828 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4829 | "-c, --client-sock"); | |
4830 | } else { | |
4831 | snprintf(client_unix_sock_path, PATH_MAX, "%s", arg); | |
4832 | } | |
c0232ea5 | 4833 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
66b2ce8e JG |
4834 | if (!arg || *arg == '\0') { |
4835 | ret = -EINVAL; | |
4836 | goto end; | |
4837 | } | |
e8fa9fb0 MD |
4838 | if (lttng_is_setuid_setgid()) { |
4839 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4840 | "-a, --apps-sock"); | |
4841 | } else { | |
4842 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg); | |
4843 | } | |
c0232ea5 | 4844 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
26296c48 | 4845 | opt_daemon = 1; |
c0232ea5 | 4846 | } else if (string_match(optname, "background") || opt == 'b') { |
72dd7491 | 4847 | opt_background = 1; |
c0232ea5 | 4848 | } else if (string_match(optname, "group") || opt == 'g') { |
66b2ce8e JG |
4849 | if (!arg || *arg == '\0') { |
4850 | ret = -EINVAL; | |
4851 | goto end; | |
4852 | } | |
e8fa9fb0 MD |
4853 | if (lttng_is_setuid_setgid()) { |
4854 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4855 | "-g, --group"); | |
4856 | } else { | |
4857 | /* | |
4858 | * If the override option is set, the pointer points to a | |
4859 | * *non* const thus freeing it even though the variable type is | |
4860 | * set to const. | |
4861 | */ | |
4862 | if (tracing_group_name_override) { | |
4863 | free((void *) tracing_group_name); | |
4864 | } | |
4865 | tracing_group_name = strdup(arg); | |
4866 | if (!tracing_group_name) { | |
4867 | PERROR("strdup"); | |
4868 | ret = -ENOMEM; | |
4869 | } | |
4870 | tracing_group_name_override = 1; | |
db322c4d | 4871 | } |
c0232ea5 | 4872 | } else if (string_match(optname, "help") || opt == 'h') { |
8190767e PP |
4873 | ret = utils_show_man_page(8, "lttng-sessiond"); |
4874 | if (ret) { | |
4875 | ERR("Cannot view man page lttng-sessiond(8)"); | |
4876 | perror("exec"); | |
4877 | } | |
4878 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
c0232ea5 | 4879 | } else if (string_match(optname, "version") || opt == 'V') { |
8ff7624a | 4880 | opt_print_version = 1; |
c0232ea5 | 4881 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
26296c48 | 4882 | opt_sig_parent = 1; |
c0232ea5 | 4883 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
66b2ce8e JG |
4884 | if (!arg || *arg == '\0') { |
4885 | ret = -EINVAL; | |
4886 | goto end; | |
4887 | } | |
e8fa9fb0 MD |
4888 | if (lttng_is_setuid_setgid()) { |
4889 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4890 | "--kconsumerd-err-sock"); | |
4891 | } else { | |
4892 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4893 | } | |
c0232ea5 | 4894 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
66b2ce8e JG |
4895 | if (!arg || *arg == '\0') { |
4896 | ret = -EINVAL; | |
4897 | goto end; | |
4898 | } | |
e8fa9fb0 MD |
4899 | if (lttng_is_setuid_setgid()) { |
4900 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4901 | "--kconsumerd-cmd-sock"); | |
4902 | } else { | |
4903 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4904 | } | |
c0232ea5 | 4905 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
66b2ce8e JG |
4906 | if (!arg || *arg == '\0') { |
4907 | ret = -EINVAL; | |
4908 | goto end; | |
4909 | } | |
e8fa9fb0 MD |
4910 | if (lttng_is_setuid_setgid()) { |
4911 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4912 | "--ustconsumerd64-err-sock"); | |
4913 | } else { | |
4914 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4915 | } | |
c0232ea5 | 4916 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
66b2ce8e JG |
4917 | if (!arg || *arg == '\0') { |
4918 | ret = -EINVAL; | |
4919 | goto end; | |
4920 | } | |
e8fa9fb0 MD |
4921 | if (lttng_is_setuid_setgid()) { |
4922 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4923 | "--ustconsumerd64-cmd-sock"); | |
4924 | } else { | |
4925 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4926 | } | |
c0232ea5 | 4927 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
66b2ce8e JG |
4928 | if (!arg || *arg == '\0') { |
4929 | ret = -EINVAL; | |
4930 | goto end; | |
4931 | } | |
e8fa9fb0 MD |
4932 | if (lttng_is_setuid_setgid()) { |
4933 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4934 | "--ustconsumerd32-err-sock"); | |
4935 | } else { | |
4936 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4937 | } | |
c0232ea5 | 4938 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
66b2ce8e JG |
4939 | if (!arg || *arg == '\0') { |
4940 | ret = -EINVAL; | |
4941 | goto end; | |
4942 | } | |
e8fa9fb0 MD |
4943 | if (lttng_is_setuid_setgid()) { |
4944 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4945 | "--ustconsumerd32-cmd-sock"); | |
4946 | } else { | |
4947 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4948 | } | |
c0232ea5 | 4949 | } else if (string_match(optname, "no-kernel")) { |
26296c48 | 4950 | opt_no_kernel = 1; |
c0232ea5 | 4951 | } else if (string_match(optname, "quiet") || opt == 'q') { |
26296c48 | 4952 | lttng_opt_quiet = 1; |
c0232ea5 | 4953 | } else if (string_match(optname, "verbose") || opt == 'v') { |
26296c48 JG |
4954 | /* Verbose level can increase using multiple -v */ |
4955 | if (arg) { | |
13755a18 | 4956 | /* Value obtained from config file */ |
26296c48 JG |
4957 | lttng_opt_verbose = config_parse_value(arg); |
4958 | } else { | |
13755a18 JG |
4959 | /* -v used on command line */ |
4960 | lttng_opt_verbose++; | |
26296c48 | 4961 | } |
13755a18 JG |
4962 | /* Clamp value to [0, 3] */ |
4963 | lttng_opt_verbose = lttng_opt_verbose < 0 ? 0 : | |
4964 | (lttng_opt_verbose <= 3 ? lttng_opt_verbose : 3); | |
c0232ea5 | 4965 | } else if (string_match(optname, "verbose-consumer")) { |
26296c48 JG |
4966 | if (arg) { |
4967 | opt_verbose_consumer = config_parse_value(arg); | |
4968 | } else { | |
ca939de8 | 4969 | opt_verbose_consumer++; |
26296c48 | 4970 | } |
c0232ea5 | 4971 | } else if (string_match(optname, "consumerd32-path")) { |
66b2ce8e JG |
4972 | if (!arg || *arg == '\0') { |
4973 | ret = -EINVAL; | |
4974 | goto end; | |
4975 | } | |
e8fa9fb0 MD |
4976 | if (lttng_is_setuid_setgid()) { |
4977 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4978 | "--consumerd32-path"); | |
4979 | } else { | |
4980 | if (consumerd32_bin_override) { | |
4981 | free((void *) consumerd32_bin); | |
4982 | } | |
4983 | consumerd32_bin = strdup(arg); | |
4984 | if (!consumerd32_bin) { | |
4985 | PERROR("strdup"); | |
4986 | ret = -ENOMEM; | |
4987 | } | |
4988 | consumerd32_bin_override = 1; | |
db322c4d | 4989 | } |
c0232ea5 | 4990 | } else if (string_match(optname, "consumerd32-libdir")) { |
66b2ce8e JG |
4991 | if (!arg || *arg == '\0') { |
4992 | ret = -EINVAL; | |
4993 | goto end; | |
4994 | } | |
e8fa9fb0 MD |
4995 | if (lttng_is_setuid_setgid()) { |
4996 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4997 | "--consumerd32-libdir"); | |
4998 | } else { | |
4999 | if (consumerd32_libdir_override) { | |
5000 | free((void *) consumerd32_libdir); | |
5001 | } | |
5002 | consumerd32_libdir = strdup(arg); | |
5003 | if (!consumerd32_libdir) { | |
5004 | PERROR("strdup"); | |
5005 | ret = -ENOMEM; | |
5006 | } | |
5007 | consumerd32_libdir_override = 1; | |
db322c4d | 5008 | } |
c0232ea5 | 5009 | } else if (string_match(optname, "consumerd64-path")) { |
66b2ce8e JG |
5010 | if (!arg || *arg == '\0') { |
5011 | ret = -EINVAL; | |
5012 | goto end; | |
5013 | } | |
e8fa9fb0 MD |
5014 | if (lttng_is_setuid_setgid()) { |
5015 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5016 | "--consumerd64-path"); | |
5017 | } else { | |
5018 | if (consumerd64_bin_override) { | |
5019 | free((void *) consumerd64_bin); | |
5020 | } | |
5021 | consumerd64_bin = strdup(arg); | |
5022 | if (!consumerd64_bin) { | |
5023 | PERROR("strdup"); | |
5024 | ret = -ENOMEM; | |
5025 | } | |
5026 | consumerd64_bin_override = 1; | |
db322c4d | 5027 | } |
c0232ea5 | 5028 | } else if (string_match(optname, "consumerd64-libdir")) { |
66b2ce8e JG |
5029 | if (!arg || *arg == '\0') { |
5030 | ret = -EINVAL; | |
5031 | goto end; | |
5032 | } | |
e8fa9fb0 MD |
5033 | if (lttng_is_setuid_setgid()) { |
5034 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5035 | "--consumerd64-libdir"); | |
5036 | } else { | |
5037 | if (consumerd64_libdir_override) { | |
5038 | free((void *) consumerd64_libdir); | |
5039 | } | |
5040 | consumerd64_libdir = strdup(arg); | |
5041 | if (!consumerd64_libdir) { | |
5042 | PERROR("strdup"); | |
5043 | ret = -ENOMEM; | |
5044 | } | |
5045 | consumerd64_libdir_override = 1; | |
db322c4d | 5046 | } |
c0232ea5 | 5047 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
66b2ce8e JG |
5048 | if (!arg || *arg == '\0') { |
5049 | ret = -EINVAL; | |
5050 | goto end; | |
5051 | } | |
e8fa9fb0 MD |
5052 | if (lttng_is_setuid_setgid()) { |
5053 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5054 | "-p, --pidfile"); | |
5055 | } else { | |
5056 | free(opt_pidfile); | |
5057 | opt_pidfile = strdup(arg); | |
5058 | if (!opt_pidfile) { | |
5059 | PERROR("strdup"); | |
5060 | ret = -ENOMEM; | |
5061 | } | |
db322c4d | 5062 | } |
c0232ea5 | 5063 | } else if (string_match(optname, "agent-tcp-port")) { |
66b2ce8e JG |
5064 | if (!arg || *arg == '\0') { |
5065 | ret = -EINVAL; | |
5066 | goto end; | |
5067 | } | |
e8fa9fb0 MD |
5068 | if (lttng_is_setuid_setgid()) { |
5069 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5070 | "--agent-tcp-port"); | |
5071 | } else { | |
5072 | unsigned long v; | |
4d076222 | 5073 | |
e8fa9fb0 MD |
5074 | errno = 0; |
5075 | v = strtoul(arg, NULL, 0); | |
5076 | if (errno != 0 || !isdigit(arg[0])) { | |
5077 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); | |
5078 | return -1; | |
5079 | } | |
5080 | if (v == 0 || v >= 65535) { | |
5081 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); | |
5082 | return -1; | |
5083 | } | |
5084 | agent_tcp_port = (uint32_t) v; | |
5085 | DBG3("Agent TCP port set to non default: %u", agent_tcp_port); | |
26296c48 | 5086 | } |
c0232ea5 | 5087 | } else if (string_match(optname, "load") || opt == 'l') { |
66b2ce8e JG |
5088 | if (!arg || *arg == '\0') { |
5089 | ret = -EINVAL; | |
5090 | goto end; | |
5091 | } | |
e8fa9fb0 MD |
5092 | if (lttng_is_setuid_setgid()) { |
5093 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5094 | "-l, --load"); | |
5095 | } else { | |
5096 | free(opt_load_session_path); | |
5097 | opt_load_session_path = strdup(arg); | |
5098 | if (!opt_load_session_path) { | |
5099 | PERROR("strdup"); | |
5100 | ret = -ENOMEM; | |
5101 | } | |
ef367a93 | 5102 | } |
c0232ea5 | 5103 | } else if (string_match(optname, "kmod-probes")) { |
66b2ce8e JG |
5104 | if (!arg || *arg == '\0') { |
5105 | ret = -EINVAL; | |
5106 | goto end; | |
5107 | } | |
e8fa9fb0 MD |
5108 | if (lttng_is_setuid_setgid()) { |
5109 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5110 | "--kmod-probes"); | |
5111 | } else { | |
5112 | free(kmod_probes_list); | |
5113 | kmod_probes_list = strdup(arg); | |
5114 | if (!kmod_probes_list) { | |
5115 | PERROR("strdup"); | |
5116 | ret = -ENOMEM; | |
5117 | } | |
c9d42407 | 5118 | } |
c0232ea5 | 5119 | } else if (string_match(optname, "extra-kmod-probes")) { |
66b2ce8e JG |
5120 | if (!arg || *arg == '\0') { |
5121 | ret = -EINVAL; | |
5122 | goto end; | |
5123 | } | |
e8fa9fb0 MD |
5124 | if (lttng_is_setuid_setgid()) { |
5125 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5126 | "--extra-kmod-probes"); | |
5127 | } else { | |
5128 | free(kmod_extra_probes_list); | |
5129 | kmod_extra_probes_list = strdup(arg); | |
5130 | if (!kmod_extra_probes_list) { | |
5131 | PERROR("strdup"); | |
5132 | ret = -ENOMEM; | |
5133 | } | |
db322c4d | 5134 | } |
c0232ea5 JG |
5135 | } else if (string_match(optname, "config") || opt == 'f') { |
5136 | /* This is handled in set_options() thus silent skip. */ | |
5137 | goto end; | |
5138 | } else { | |
26296c48 JG |
5139 | /* Unknown option or other error. |
5140 | * Error is printed by getopt, just return */ | |
5141 | ret = -1; | |
5142 | } | |
5143 | ||
f3dd7ce7 | 5144 | end: |
c5d350b2 JG |
5145 | if (ret == -EINVAL) { |
5146 | const char *opt_name = "unknown"; | |
5147 | int i; | |
5148 | ||
5149 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); | |
5150 | i++) { | |
5151 | if (opt == long_options[i].val) { | |
5152 | opt_name = long_options[i].name; | |
5153 | break; | |
5154 | } | |
5155 | } | |
5156 | ||
5157 | WARN("Invalid argument provided for option \"%s\", using default value.", | |
5158 | opt_name); | |
5159 | } | |
f3dd7ce7 | 5160 | |
26296c48 JG |
5161 | return ret; |
5162 | } | |
5163 | ||
5164 | /* | |
5165 | * config_entry_handler_cb used to handle options read from a config file. | |
f40ef1d5 | 5166 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
26296c48 JG |
5167 | * return value conventions. |
5168 | */ | |
5169 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
5170 | { | |
5171 | int ret = 0, i; | |
5172 | ||
5173 | if (!entry || !entry->name || !entry->value) { | |
5174 | ret = -EINVAL; | |
5175 | goto end; | |
5176 | } | |
5177 | ||
5178 | /* Check if the option is to be ignored */ | |
5179 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
5180 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
5181 | goto end; | |
5182 | } | |
5183 | } | |
5184 | ||
5185 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
5186 | i++) { | |
5187 | ||
5188 | /* Ignore if not fully matched. */ | |
5189 | if (strcmp(entry->name, long_options[i].name)) { | |
5190 | continue; | |
5191 | } | |
5192 | ||
5193 | /* | |
5194 | * If the option takes no argument on the command line, we have to | |
5195 | * check if the value is "true". We support non-zero numeric values, | |
5196 | * true, on and yes. | |
5197 | */ | |
5198 | if (!long_options[i].has_arg) { | |
5199 | ret = config_parse_value(entry->value); | |
5200 | if (ret <= 0) { | |
5201 | if (ret) { | |
5202 | WARN("Invalid configuration value \"%s\" for option %s", | |
5203 | entry->value, entry->name); | |
5204 | } | |
5205 | /* False, skip boolean config option. */ | |
5206 | goto end; | |
4d076222 | 5207 | } |
26296c48 JG |
5208 | } |
5209 | ||
5210 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
5211 | goto end; | |
5212 | } | |
5213 | ||
5214 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
5215 | ||
5216 | end: | |
5217 | return ret; | |
5218 | } | |
5219 | ||
8ff7624a JR |
5220 | static void sessiond_config_log(void) |
5221 | { | |
5222 | DBG("LTTng-sessiond " VERSION " - " VERSION_NAME "%s%s", | |
5223 | GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION, | |
5224 | EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " EXTRA_VERSION_NAME); | |
5225 | if (EXTRA_VERSION_DESCRIPTION[0] != '\0') { | |
5226 | DBG("LTTng-sessiond extra version description:\n\t" EXTRA_VERSION_DESCRIPTION "\n"); | |
5227 | } | |
2987f328 JR |
5228 | if (EXTRA_VERSION_PATCHES[0] != '\0') { |
5229 | DBG("LTTng-sessiond extra patches:\n\t" EXTRA_VERSION_PATCHES "\n"); | |
5230 | } | |
8ff7624a JR |
5231 | } |
5232 | ||
5233 | static void print_version(void) { | |
5234 | fprintf(stdout, "%s\n", VERSION); | |
5235 | } | |
5236 | ||
26296c48 JG |
5237 | /* |
5238 | * daemon configuration loading and argument parsing | |
5239 | */ | |
5240 | static int set_options(int argc, char **argv) | |
5241 | { | |
5242 | int ret = 0, c = 0, option_index = 0; | |
5243 | int orig_optopt = optopt, orig_optind = optind; | |
5244 | char *optstring; | |
5245 | const char *config_path = NULL; | |
5246 | ||
5247 | optstring = utils_generate_optstring(long_options, | |
5248 | sizeof(long_options) / sizeof(struct option)); | |
5249 | if (!optstring) { | |
5250 | ret = -ENOMEM; | |
5251 | goto end; | |
5252 | } | |
5253 | ||
5254 | /* Check for the --config option */ | |
5255 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
5256 | &option_index)) != -1) { | |
5257 | if (c == '?') { | |
5258 | ret = -EINVAL; | |
5259 | goto end; | |
5260 | } else if (c != 'f') { | |
5261 | /* if not equal to --config option. */ | |
5262 | continue; | |
5263 | } | |
5264 | ||
e8fa9fb0 MD |
5265 | if (lttng_is_setuid_setgid()) { |
5266 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5267 | "-f, --config"); | |
5268 | } else { | |
5269 | config_path = utils_expand_path(optarg); | |
5270 | if (!config_path) { | |
5271 | ERR("Failed to resolve path: %s", optarg); | |
5272 | } | |
26296c48 JG |
5273 | } |
5274 | } | |
5275 | ||
5276 | ret = config_get_section_entries(config_path, config_section_name, | |
5277 | config_entry_handler, NULL); | |
5278 | if (ret) { | |
5279 | if (ret > 0) { | |
5280 | ERR("Invalid configuration option at line %i", ret); | |
5281 | ret = -1; | |
5282 | } | |
5283 | goto end; | |
5284 | } | |
5285 | ||
5286 | /* Reset getopt's global state */ | |
5287 | optopt = orig_optopt; | |
5288 | optind = orig_optind; | |
5289 | while (1) { | |
c0232ea5 JG |
5290 | option_index = -1; |
5291 | /* | |
5292 | * getopt_long() will not set option_index if it encounters a | |
5293 | * short option. | |
5294 | */ | |
5295 | c = getopt_long(argc, argv, optstring, long_options, | |
5296 | &option_index); | |
26296c48 | 5297 | if (c == -1) { |
4d076222 DG |
5298 | break; |
5299 | } | |
26296c48 | 5300 | |
c0232ea5 JG |
5301 | /* |
5302 | * Pass NULL as the long option name if popt left the index | |
5303 | * unset. | |
5304 | */ | |
5305 | ret = set_option(c, optarg, | |
5306 | option_index < 0 ? NULL : | |
5307 | long_options[option_index].name); | |
26296c48 JG |
5308 | if (ret < 0) { |
5309 | break; | |
fac6795d DG |
5310 | } |
5311 | } | |
5312 | ||
26296c48 JG |
5313 | end: |
5314 | free(optstring); | |
5315 | return ret; | |
fac6795d DG |
5316 | } |
5317 | ||
5318 | /* | |
d063d709 | 5319 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
5320 | * apps_sock - The communication socket for all UST apps. |
5321 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 5322 | */ |
cf3af59e | 5323 | static int init_daemon_socket(void) |
fac6795d DG |
5324 | { |
5325 | int ret = 0; | |
5326 | mode_t old_umask; | |
5327 | ||
5328 | old_umask = umask(0); | |
5329 | ||
5330 | /* Create client tool unix socket */ | |
d6f42150 DG |
5331 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
5332 | if (client_sock < 0) { | |
5333 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
5334 | ret = -1; |
5335 | goto end; | |
5336 | } | |
5337 | ||
b662582b DG |
5338 | /* Set the cloexec flag */ |
5339 | ret = utils_set_fd_cloexec(client_sock); | |
5340 | if (ret < 0) { | |
5341 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
5342 | "Continuing but note that the consumer daemon will have a " | |
5343 | "reference to this socket on exec()", client_sock); | |
5344 | } | |
5345 | ||
fac6795d DG |
5346 | /* File permission MUST be 660 */ |
5347 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
5348 | if (ret < 0) { | |
d6f42150 | 5349 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 5350 | PERROR("chmod"); |
fac6795d DG |
5351 | goto end; |
5352 | } | |
5353 | ||
5354 | /* Create the application unix socket */ | |
d6f42150 DG |
5355 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
5356 | if (apps_sock < 0) { | |
5357 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
5358 | ret = -1; |
5359 | goto end; | |
5360 | } | |
5361 | ||
b662582b DG |
5362 | /* Set the cloexec flag */ |
5363 | ret = utils_set_fd_cloexec(apps_sock); | |
5364 | if (ret < 0) { | |
5365 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
5366 | "Continuing but note that the consumer daemon will have a " | |
5367 | "reference to this socket on exec()", apps_sock); | |
5368 | } | |
5369 | ||
d6f42150 | 5370 | /* File permission MUST be 666 */ |
54d01ffb DG |
5371 | ret = chmod(apps_unix_sock_path, |
5372 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 5373 | if (ret < 0) { |
d6f42150 | 5374 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 5375 | PERROR("chmod"); |
fac6795d DG |
5376 | goto end; |
5377 | } | |
5378 | ||
b662582b DG |
5379 | DBG3("Session daemon client socket %d and application socket %d created", |
5380 | client_sock, apps_sock); | |
5381 | ||
fac6795d DG |
5382 | end: |
5383 | umask(old_umask); | |
5384 | return ret; | |
5385 | } | |
5386 | ||
5387 | /* | |
54d01ffb DG |
5388 | * Check if the global socket is available, and if a daemon is answering at the |
5389 | * other side. If yes, error is returned. | |
fac6795d | 5390 | */ |
cf3af59e | 5391 | static int check_existing_daemon(void) |
fac6795d | 5392 | { |
7d8234d9 | 5393 | /* Is there anybody out there ? */ |
099e26bd | 5394 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 5395 | return -EEXIST; |
099e26bd | 5396 | } |
b09c7c76 DG |
5397 | |
5398 | return 0; | |
fac6795d DG |
5399 | } |
5400 | ||
fac6795d | 5401 | /* |
d063d709 | 5402 | * Set the tracing group gid onto the client socket. |
5e16da05 | 5403 | * |
d063d709 | 5404 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 5405 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 5406 | */ |
be040666 | 5407 | static int set_permissions(char *rundir) |
fac6795d DG |
5408 | { |
5409 | int ret; | |
996b65c8 | 5410 | gid_t gid; |
fac6795d | 5411 | |
6c71277b | 5412 | gid = utils_get_group_id(tracing_group_name); |
fac6795d | 5413 | |
d6f42150 | 5414 | /* Set lttng run dir */ |
be040666 | 5415 | ret = chown(rundir, 0, gid); |
d6f42150 | 5416 | if (ret < 0) { |
be040666 | 5417 | ERR("Unable to set group on %s", rundir); |
76d7553f | 5418 | PERROR("chown"); |
d6f42150 DG |
5419 | } |
5420 | ||
6c71277b MD |
5421 | /* |
5422 | * Ensure all applications and tracing group can search the run | |
5423 | * dir. Allow everyone to read the directory, since it does not | |
5424 | * buy us anything to hide its content. | |
5425 | */ | |
5426 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
5427 | if (ret < 0) { |
5428 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5429 | PERROR("chmod"); |
d1613cf5 JN |
5430 | } |
5431 | ||
d6f42150 | 5432 | /* lttng client socket path */ |
996b65c8 | 5433 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 5434 | if (ret < 0) { |
d6f42150 | 5435 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 5436 | PERROR("chown"); |
d6f42150 DG |
5437 | } |
5438 | ||
3bd1e081 | 5439 | /* kconsumer error socket path */ |
6c71277b | 5440 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 5441 | if (ret < 0) { |
3bd1e081 | 5442 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5443 | PERROR("chown"); |
3bd1e081 MD |
5444 | } |
5445 | ||
7753dea8 | 5446 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 5447 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
5448 | if (ret < 0) { |
5449 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5450 | PERROR("chown"); |
7753dea8 MD |
5451 | } |
5452 | ||
5453 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 5454 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 5455 | if (ret < 0) { |
7753dea8 | 5456 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5457 | PERROR("chown"); |
fac6795d DG |
5458 | } |
5459 | ||
d6f42150 | 5460 | DBG("All permissions are set"); |
e07ae692 | 5461 | |
fac6795d DG |
5462 | return ret; |
5463 | } | |
5464 | ||
d6f42150 | 5465 | /* |
d063d709 | 5466 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5467 | */ |
67e40797 | 5468 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
5469 | { |
5470 | int ret; | |
5471 | ||
67e40797 DG |
5472 | DBG3("Creating LTTng run directory: %s", rundir); |
5473 | ||
d1613cf5 | 5474 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 5475 | if (ret < 0) { |
b1f11e69 | 5476 | if (errno != EEXIST) { |
67e40797 | 5477 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
5478 | goto error; |
5479 | } else { | |
5480 | ret = 0; | |
5481 | } | |
d6f42150 DG |
5482 | } |
5483 | ||
5484 | error: | |
5485 | return ret; | |
5486 | } | |
5487 | ||
5488 | /* | |
d063d709 DG |
5489 | * Setup sockets and directory needed by the kconsumerd communication with the |
5490 | * session daemon. | |
d6f42150 | 5491 | */ |
67e40797 DG |
5492 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
5493 | const char *rundir) | |
d6f42150 DG |
5494 | { |
5495 | int ret; | |
67e40797 | 5496 | char path[PATH_MAX]; |
d6f42150 | 5497 | |
6c71277b | 5498 | switch (consumer_data->type) { |
7753dea8 | 5499 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 5500 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
5501 | break; |
5502 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 5503 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
5504 | break; |
5505 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 5506 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
5507 | break; |
5508 | default: | |
5509 | ERR("Consumer type unknown"); | |
5510 | ret = -EINVAL; | |
5511 | goto error; | |
d6f42150 DG |
5512 | } |
5513 | ||
67e40797 DG |
5514 | DBG2("Creating consumer directory: %s", path); |
5515 | ||
6c71277b | 5516 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
d6f42150 | 5517 | if (ret < 0) { |
6beb2242 | 5518 | if (errno != EEXIST) { |
f11e84c2 | 5519 | PERROR("mkdir"); |
3bd1e081 | 5520 | ERR("Failed to create %s", path); |
6beb2242 DG |
5521 | goto error; |
5522 | } | |
f11e84c2 | 5523 | ret = -1; |
d6f42150 | 5524 | } |
6c71277b MD |
5525 | if (is_root) { |
5526 | ret = chown(path, 0, utils_get_group_id(tracing_group_name)); | |
5527 | if (ret < 0) { | |
5528 | ERR("Unable to set group on %s", path); | |
5529 | PERROR("chown"); | |
5530 | goto error; | |
5531 | } | |
5532 | } | |
d6f42150 DG |
5533 | |
5534 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
5535 | consumer_data->err_sock = |
5536 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5537 | if (consumer_data->err_sock < 0) { | |
5538 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5539 | ret = -1; |
5540 | goto error; | |
5541 | } | |
5542 | ||
a24f05ab MD |
5543 | /* |
5544 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
5545 | * show must go on. | |
5546 | */ | |
5547 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
5548 | if (ret < 0) { | |
5549 | PERROR("utils_set_fd_cloexec"); | |
5550 | /* continue anyway */ | |
5551 | } | |
5552 | ||
d6f42150 | 5553 | /* File permission MUST be 660 */ |
3bd1e081 | 5554 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5555 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5556 | if (ret < 0) { |
3bd1e081 | 5557 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5558 | PERROR("chmod"); |
d6f42150 DG |
5559 | goto error; |
5560 | } | |
5561 | ||
5562 | error: | |
5563 | return ret; | |
5564 | } | |
5565 | ||
fac6795d | 5566 | /* |
d063d709 | 5567 | * Signal handler for the daemon |
cf3af59e | 5568 | * |
54d01ffb DG |
5569 | * Simply stop all worker threads, leaving main() return gracefully after |
5570 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5571 | */ |
5572 | static void sighandler(int sig) | |
5573 | { | |
5574 | switch (sig) { | |
cf3af59e | 5575 | case SIGINT: |
af87c45a | 5576 | DBG("SIGINT caught"); |
cf3af59e MD |
5577 | stop_threads(); |
5578 | break; | |
5579 | case SIGTERM: | |
af87c45a | 5580 | DBG("SIGTERM caught"); |
cf3af59e MD |
5581 | stop_threads(); |
5582 | break; | |
0bb7724a DG |
5583 | case SIGUSR1: |
5584 | CMM_STORE_SHARED(recv_child_signal, 1); | |
5585 | break; | |
cf3af59e MD |
5586 | default: |
5587 | break; | |
fac6795d | 5588 | } |
fac6795d DG |
5589 | } |
5590 | ||
5591 | /* | |
d063d709 | 5592 | * Setup signal handler for : |
1d4b027a | 5593 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5594 | */ |
1d4b027a | 5595 | static int set_signal_handler(void) |
fac6795d | 5596 | { |
1d4b027a DG |
5597 | int ret = 0; |
5598 | struct sigaction sa; | |
5599 | sigset_t sigset; | |
fac6795d | 5600 | |
1d4b027a | 5601 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5602 | PERROR("sigemptyset"); |
1d4b027a DG |
5603 | return ret; |
5604 | } | |
d6f42150 | 5605 | |
1d4b027a DG |
5606 | sa.sa_mask = sigset; |
5607 | sa.sa_flags = 0; | |
0072e5e2 MD |
5608 | |
5609 | sa.sa_handler = sighandler; | |
1d4b027a | 5610 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
76d7553f | 5611 | PERROR("sigaction"); |
1d4b027a | 5612 | return ret; |
d6f42150 DG |
5613 | } |
5614 | ||
1d4b027a | 5615 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5616 | PERROR("sigaction"); |
1d4b027a | 5617 | return ret; |
d6f42150 | 5618 | } |
aaf26714 | 5619 | |
0072e5e2 | 5620 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
76d7553f | 5621 | PERROR("sigaction"); |
1d4b027a | 5622 | return ret; |
8c0faa1d DG |
5623 | } |
5624 | ||
0072e5e2 MD |
5625 | sa.sa_handler = SIG_IGN; |
5626 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
0bb7724a DG |
5627 | PERROR("sigaction"); |
5628 | return ret; | |
5629 | } | |
5630 | ||
5631 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
5632 | |
5633 | return ret; | |
fac6795d DG |
5634 | } |
5635 | ||
f3ed775e | 5636 | /* |
d063d709 | 5637 | * Set open files limit to unlimited. This daemon can open a large number of |
514bb9f0 | 5638 | * file descriptors in order to consume multiple kernel traces. |
f3ed775e DG |
5639 | */ |
5640 | static void set_ulimit(void) | |
5641 | { | |
5642 | int ret; | |
5643 | struct rlimit lim; | |
5644 | ||
514bb9f0 | 5645 | /* The kernel does not allow an infinite limit for open files */ |
f3ed775e DG |
5646 | lim.rlim_cur = 65535; |
5647 | lim.rlim_max = 65535; | |
5648 | ||
5649 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5650 | if (ret < 0) { | |
76d7553f | 5651 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5652 | } |
5653 | } | |
5654 | ||
35f90c40 DG |
5655 | /* |
5656 | * Write pidfile using the rundir and opt_pidfile. | |
5657 | */ | |
4a15001e | 5658 | static int write_pidfile(void) |
35f90c40 DG |
5659 | { |
5660 | int ret; | |
5661 | char pidfile_path[PATH_MAX]; | |
5662 | ||
5663 | assert(rundir); | |
5664 | ||
5665 | if (opt_pidfile) { | |
b8d76705 MD |
5666 | if (lttng_strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path))) { |
5667 | ret = -1; | |
5668 | goto error; | |
5669 | } | |
35f90c40 DG |
5670 | } else { |
5671 | /* Build pidfile path from rundir and opt_pidfile. */ | |
5672 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
5673 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
5674 | if (ret < 0) { | |
5675 | PERROR("snprintf pidfile path"); | |
5676 | goto error; | |
5677 | } | |
5678 | } | |
5679 | ||
5680 | /* | |
4a15001e | 5681 | * Create pid file in rundir. |
35f90c40 | 5682 | */ |
4a15001e | 5683 | ret = utils_create_pid_file(getpid(), pidfile_path); |
35f90c40 | 5684 | error: |
4a15001e | 5685 | return ret; |
35f90c40 DG |
5686 | } |
5687 | ||
c9cb3e7d JG |
5688 | /* |
5689 | * Create lockfile using the rundir and return its fd. | |
5690 | */ | |
5691 | static int create_lockfile(void) | |
5692 | { | |
5693 | int ret; | |
5694 | char lockfile_path[PATH_MAX]; | |
5695 | ||
5696 | ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path)); | |
5697 | if (ret < 0) { | |
5698 | goto error; | |
5699 | } | |
5700 | ||
5701 | ret = utils_create_lock_file(lockfile_path); | |
5702 | error: | |
5703 | return ret; | |
5704 | } | |
5705 | ||
cd9290dd | 5706 | /* |
022d91ba | 5707 | * Write agent TCP port using the rundir. |
cd9290dd | 5708 | */ |
4a15001e | 5709 | static int write_agent_port(void) |
cd9290dd DG |
5710 | { |
5711 | int ret; | |
5712 | char path[PATH_MAX]; | |
5713 | ||
5714 | assert(rundir); | |
5715 | ||
5716 | ret = snprintf(path, sizeof(path), "%s/" | |
022d91ba | 5717 | DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE, rundir); |
cd9290dd | 5718 | if (ret < 0) { |
022d91ba | 5719 | PERROR("snprintf agent port path"); |
cd9290dd DG |
5720 | goto error; |
5721 | } | |
5722 | ||
5723 | /* | |
4a15001e | 5724 | * Create TCP agent port file in rundir. |
cd9290dd | 5725 | */ |
4a15001e | 5726 | ret = utils_create_pid_file(agent_tcp_port, path); |
cd9290dd DG |
5727 | |
5728 | error: | |
4a15001e | 5729 | return ret; |
ef367a93 JG |
5730 | } |
5731 | ||
51c59105 JG |
5732 | static int set_clock_plugin_env(void) |
5733 | { | |
5734 | int ret = 0; | |
5735 | const char *original_env_value; | |
5736 | char *full_path = NULL; | |
5737 | char *new_env_value = NULL; | |
5738 | ||
5739 | original_env_value = getenv("LTTNG_UST_CLOCK_PLUGIN"); | |
5740 | if (!original_env_value) { | |
5741 | goto end; | |
5742 | } | |
5743 | ||
5744 | full_path = utils_expand_path(original_env_value); | |
5745 | if (!full_path) { | |
5746 | ERR("Failed to expand LTTNG_UST_CLOCK_PLUGIN path \"%s\"", | |
5747 | original_env_value); | |
5748 | ret = -1; | |
5749 | goto end; | |
5750 | } | |
5751 | ret = asprintf(&new_env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", | |
5752 | full_path); | |
5753 | free(full_path); | |
5754 | if (ret < 0) { | |
5755 | PERROR("asprintf"); | |
5756 | goto end; | |
5757 | } | |
5758 | ||
5759 | DBG("Updating environment: %s", new_env_value); | |
5760 | ret = putenv(new_env_value); | |
5761 | if (ret) { | |
5762 | free(new_env_value); | |
5763 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); | |
5764 | goto end; | |
5765 | } | |
5766 | end: | |
5767 | return ret; | |
5768 | } | |
5769 | ||
fac6795d DG |
5770 | /* |
5771 | * main | |
5772 | */ | |
5773 | int main(int argc, char **argv) | |
5774 | { | |
4a15001e | 5775 | int ret = 0, retval = 0; |
fac6795d | 5776 | void *status; |
ae9e45b3 | 5777 | const char *home_path, *env_app_timeout; |
fac6795d | 5778 | |
335a95b7 MD |
5779 | init_kernel_workarounds(); |
5780 | ||
f6a9efaa DG |
5781 | rcu_register_thread(); |
5782 | ||
4a15001e MD |
5783 | if (set_signal_handler()) { |
5784 | retval = -1; | |
5785 | goto exit_set_signal_handler; | |
0bb7724a DG |
5786 | } |
5787 | ||
7753dea8 | 5788 | setup_consumerd_path(); |
fb09408a | 5789 | |
12744796 DG |
5790 | page_size = sysconf(_SC_PAGESIZE); |
5791 | if (page_size < 0) { | |
5792 | PERROR("sysconf _SC_PAGESIZE"); | |
5793 | page_size = LONG_MAX; | |
5794 | WARN("Fallback page size to %ld", page_size); | |
5795 | } | |
5796 | ||
4a15001e MD |
5797 | /* |
5798 | * Parse arguments and load the daemon configuration file. | |
5799 | * | |
5800 | * We have an exit_options exit path to free memory reserved by | |
5801 | * set_options. This is needed because the rest of sessiond_cleanup() | |
5802 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which | |
5803 | * depends on set_options. | |
5804 | */ | |
fac6795d | 5805 | progname = argv[0]; |
4a15001e MD |
5806 | if (set_options(argc, argv)) { |
5807 | retval = -1; | |
5808 | goto exit_options; | |
fac6795d DG |
5809 | } |
5810 | ||
8ff7624a JR |
5811 | sessiond_config_log(); |
5812 | ||
5813 | if (opt_print_version) { | |
5814 | print_version(); | |
5815 | retval = 0; | |
5816 | goto exit_options; | |
5817 | } | |
5818 | ||
51c59105 JG |
5819 | ret = set_clock_plugin_env(); |
5820 | if (ret) { | |
5821 | retval = -1; | |
5822 | goto exit_options; | |
5823 | } | |
5824 | ||
fac6795d | 5825 | /* Daemonize */ |
72dd7491 | 5826 | if (opt_daemon || opt_background) { |
ceed52b5 MD |
5827 | int i; |
5828 | ||
72dd7491 MD |
5829 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
5830 | !opt_background); | |
53094c05 | 5831 | if (ret < 0) { |
4a15001e MD |
5832 | retval = -1; |
5833 | goto exit_options; | |
53094c05 | 5834 | } |
0bb7724a | 5835 | |
ceed52b5 | 5836 | /* |
0bb7724a | 5837 | * We are in the child. Make sure all other file descriptors are |
4a15001e MD |
5838 | * closed, in case we are called with more opened file |
5839 | * descriptors than the standard ones. | |
ceed52b5 MD |
5840 | */ |
5841 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
5842 | (void) close(i); | |
5843 | } | |
5844 | } | |
5845 | ||
7567352f MD |
5846 | if (run_as_create_worker(argv[0]) < 0) { |
5847 | goto exit_create_run_as_worker_cleanup; | |
5848 | } | |
5849 | ||
4a15001e MD |
5850 | /* |
5851 | * Starting from here, we can create threads. This needs to be after | |
5852 | * lttng_daemonize due to RCU. | |
5853 | */ | |
5854 | ||
5855 | /* | |
5856 | * Initialize the health check subsystem. This call should set the | |
5857 | * appropriate time values. | |
5858 | */ | |
5859 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); | |
5860 | if (!health_sessiond) { | |
5861 | PERROR("health_app_create error"); | |
5862 | retval = -1; | |
5863 | goto exit_health_sessiond_cleanup; | |
5864 | } | |
5865 | ||
4a15001e | 5866 | /* Create thread to clean up RCU hash tables */ |
5e97de00 | 5867 | if (init_ht_cleanup_thread(&ht_cleanup_thread)) { |
4a15001e MD |
5868 | retval = -1; |
5869 | goto exit_ht_cleanup; | |
5870 | } | |
5871 | ||
ceed52b5 | 5872 | /* Create thread quit pipe */ |
4a15001e MD |
5873 | if (init_thread_quit_pipe()) { |
5874 | retval = -1; | |
5875 | goto exit_init_data; | |
fac6795d DG |
5876 | } |
5877 | ||
5878 | /* Check if daemon is UID = 0 */ | |
5879 | is_root = !getuid(); | |
5880 | ||
fac6795d | 5881 | if (is_root) { |
990570ed | 5882 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
4ea184d1 | 5883 | if (!rundir) { |
4a15001e MD |
5884 | retval = -1; |
5885 | goto exit_init_data; | |
4ea184d1 | 5886 | } |
67e40797 DG |
5887 | |
5888 | /* Create global run dir with root access */ | |
4a15001e MD |
5889 | if (create_lttng_rundir(rundir)) { |
5890 | retval = -1; | |
5891 | goto exit_init_data; | |
d6f42150 DG |
5892 | } |
5893 | ||
fac6795d | 5894 | if (strlen(apps_unix_sock_path) == 0) { |
4a15001e | 5895 | ret = snprintf(apps_unix_sock_path, PATH_MAX, |
d6f42150 | 5896 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); |
4a15001e MD |
5897 | if (ret < 0) { |
5898 | retval = -1; | |
5899 | goto exit_init_data; | |
5900 | } | |
fac6795d DG |
5901 | } |
5902 | ||
5903 | if (strlen(client_unix_sock_path) == 0) { | |
4a15001e | 5904 | ret = snprintf(client_unix_sock_path, PATH_MAX, |
d6f42150 | 5905 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); |
4a15001e MD |
5906 | if (ret < 0) { |
5907 | retval = -1; | |
5908 | goto exit_init_data; | |
5909 | } | |
d6f42150 | 5910 | } |
0fdd1e2c DG |
5911 | |
5912 | /* Set global SHM for ust */ | |
5913 | if (strlen(wait_shm_path) == 0) { | |
4a15001e | 5914 | ret = snprintf(wait_shm_path, PATH_MAX, |
0fdd1e2c | 5915 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); |
4a15001e MD |
5916 | if (ret < 0) { |
5917 | retval = -1; | |
5918 | goto exit_init_data; | |
5919 | } | |
0fdd1e2c | 5920 | } |
67e40797 | 5921 | |
44a5e5eb | 5922 | if (strlen(health_unix_sock_path) == 0) { |
4a15001e MD |
5923 | ret = snprintf(health_unix_sock_path, |
5924 | sizeof(health_unix_sock_path), | |
44a5e5eb | 5925 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); |
4a15001e MD |
5926 | if (ret < 0) { |
5927 | retval = -1; | |
5928 | goto exit_init_data; | |
5929 | } | |
44a5e5eb DG |
5930 | } |
5931 | ||
67e40797 | 5932 | /* Setup kernel consumerd path */ |
4a15001e | 5933 | ret = snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 5934 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
4a15001e MD |
5935 | if (ret < 0) { |
5936 | retval = -1; | |
5937 | goto exit_init_data; | |
5938 | } | |
5939 | ret = snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 5940 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
4a15001e MD |
5941 | if (ret < 0) { |
5942 | retval = -1; | |
5943 | goto exit_init_data; | |
5944 | } | |
67e40797 DG |
5945 | |
5946 | DBG2("Kernel consumer err path: %s", | |
5947 | kconsumer_data.err_unix_sock_path); | |
5948 | DBG2("Kernel consumer cmd path: %s", | |
5949 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 5950 | } else { |
feb0f3e5 | 5951 | home_path = utils_get_home_dir(); |
b082db07 | 5952 | if (home_path == NULL) { |
273ea72c DG |
5953 | /* TODO: Add --socket PATH option */ |
5954 | ERR("Can't get HOME directory for sockets creation."); | |
4a15001e MD |
5955 | retval = -1; |
5956 | goto exit_init_data; | |
b082db07 DG |
5957 | } |
5958 | ||
67e40797 DG |
5959 | /* |
5960 | * Create rundir from home path. This will create something like | |
5961 | * $HOME/.lttng | |
5962 | */ | |
990570ed | 5963 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 | 5964 | if (ret < 0) { |
4a15001e MD |
5965 | retval = -1; |
5966 | goto exit_init_data; | |
67e40797 DG |
5967 | } |
5968 | ||
4a15001e MD |
5969 | if (create_lttng_rundir(rundir)) { |
5970 | retval = -1; | |
5971 | goto exit_init_data; | |
67e40797 DG |
5972 | } |
5973 | ||
fac6795d | 5974 | if (strlen(apps_unix_sock_path) == 0) { |
4a15001e MD |
5975 | ret = snprintf(apps_unix_sock_path, PATH_MAX, |
5976 | DEFAULT_HOME_APPS_UNIX_SOCK, | |
5977 | home_path); | |
5978 | if (ret < 0) { | |
5979 | retval = -1; | |
5980 | goto exit_init_data; | |
5981 | } | |
fac6795d DG |
5982 | } |
5983 | ||
5984 | /* Set the cli tool unix socket path */ | |
5985 | if (strlen(client_unix_sock_path) == 0) { | |
4a15001e MD |
5986 | ret = snprintf(client_unix_sock_path, PATH_MAX, |
5987 | DEFAULT_HOME_CLIENT_UNIX_SOCK, | |
5988 | home_path); | |
5989 | if (ret < 0) { | |
5990 | retval = -1; | |
5991 | goto exit_init_data; | |
5992 | } | |
fac6795d | 5993 | } |
0fdd1e2c DG |
5994 | |
5995 | /* Set global SHM for ust */ | |
5996 | if (strlen(wait_shm_path) == 0) { | |
4a15001e MD |
5997 | ret = snprintf(wait_shm_path, PATH_MAX, |
5998 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, | |
5999 | getuid()); | |
6000 | if (ret < 0) { | |
6001 | retval = -1; | |
6002 | goto exit_init_data; | |
6003 | } | |
0fdd1e2c | 6004 | } |
44a5e5eb DG |
6005 | |
6006 | /* Set health check Unix path */ | |
6007 | if (strlen(health_unix_sock_path) == 0) { | |
4a15001e MD |
6008 | ret = snprintf(health_unix_sock_path, |
6009 | sizeof(health_unix_sock_path), | |
6010 | DEFAULT_HOME_HEALTH_UNIX_SOCK, | |
6011 | home_path); | |
6012 | if (ret < 0) { | |
6013 | retval = -1; | |
6014 | goto exit_init_data; | |
6015 | } | |
44a5e5eb | 6016 | } |
fac6795d DG |
6017 | } |
6018 | ||
c9cb3e7d JG |
6019 | lockfile_fd = create_lockfile(); |
6020 | if (lockfile_fd < 0) { | |
4a15001e MD |
6021 | retval = -1; |
6022 | goto exit_init_data; | |
c9cb3e7d JG |
6023 | } |
6024 | ||
5c827ce0 DG |
6025 | /* Set consumer initial state */ |
6026 | kernel_consumerd_state = CONSUMER_STOPPED; | |
6027 | ust_consumerd_state = CONSUMER_STOPPED; | |
6028 | ||
847177cd DG |
6029 | DBG("Client socket path %s", client_unix_sock_path); |
6030 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 6031 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
6032 | DBG("LTTng run directory path: %s", rundir); |
6033 | ||
6034 | /* 32 bits consumerd path setup */ | |
4a15001e | 6035 | ret = snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 6036 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
4a15001e MD |
6037 | if (ret < 0) { |
6038 | PERROR("snprintf 32-bit consumer error socket path"); | |
6039 | retval = -1; | |
6040 | goto exit_init_data; | |
6041 | } | |
6042 | ret = snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 6043 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
4a15001e MD |
6044 | if (ret < 0) { |
6045 | PERROR("snprintf 32-bit consumer command socket path"); | |
6046 | retval = -1; | |
6047 | goto exit_init_data; | |
6048 | } | |
67e40797 DG |
6049 | |
6050 | DBG2("UST consumer 32 bits err path: %s", | |
6051 | ustconsumer32_data.err_unix_sock_path); | |
6052 | DBG2("UST consumer 32 bits cmd path: %s", | |
6053 | ustconsumer32_data.cmd_unix_sock_path); | |
6054 | ||
6055 | /* 64 bits consumerd path setup */ | |
4a15001e | 6056 | ret = snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 6057 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
4a15001e MD |
6058 | if (ret < 0) { |
6059 | PERROR("snprintf 64-bit consumer error socket path"); | |
6060 | retval = -1; | |
6061 | goto exit_init_data; | |
6062 | } | |
6063 | ret = snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 6064 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
4a15001e MD |
6065 | if (ret < 0) { |
6066 | PERROR("snprintf 64-bit consumer command socket path"); | |
6067 | retval = -1; | |
6068 | goto exit_init_data; | |
6069 | } | |
67e40797 DG |
6070 | |
6071 | DBG2("UST consumer 64 bits err path: %s", | |
6072 | ustconsumer64_data.err_unix_sock_path); | |
6073 | DBG2("UST consumer 64 bits cmd path: %s", | |
6074 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 6075 | |
273ea72c | 6076 | /* |
7d8234d9 | 6077 | * See if daemon already exist. |
fac6795d | 6078 | */ |
4a15001e | 6079 | if (check_existing_daemon()) { |
75462a81 | 6080 | ERR("Already running daemon.\n"); |
273ea72c | 6081 | /* |
cf3af59e MD |
6082 | * We do not goto exit because we must not cleanup() |
6083 | * because a daemon is already running. | |
ab118b20 | 6084 | */ |
4a15001e MD |
6085 | retval = -1; |
6086 | goto exit_init_data; | |
a88df331 DG |
6087 | } |
6088 | ||
1427f9b2 DG |
6089 | /* |
6090 | * Init UST app hash table. Alloc hash table before this point since | |
6091 | * cleanup() can get called after that point. | |
6092 | */ | |
4a15001e | 6093 | if (ust_app_ht_alloc()) { |
ddbeb0f6 | 6094 | ERR("Failed to allocate UST app hash table"); |
4a15001e MD |
6095 | retval = -1; |
6096 | goto exit_init_data; | |
6097 | } | |
1427f9b2 | 6098 | |
6a4e4039 JG |
6099 | /* |
6100 | * Initialize agent app hash table. We allocate the hash table here | |
6101 | * since cleanup() can get called after this point. | |
6102 | */ | |
6103 | if (agent_app_ht_alloc()) { | |
6104 | ERR("Failed to allocate Agent app hash table"); | |
4a15001e MD |
6105 | retval = -1; |
6106 | goto exit_init_data; | |
f20baf8e DG |
6107 | } |
6108 | ||
a88df331 DG |
6109 | /* |
6110 | * These actions must be executed as root. We do that *after* setting up | |
6111 | * the sockets path because we MUST make the check for another daemon using | |
6112 | * those paths *before* trying to set the kernel consumer sockets and init | |
6113 | * kernel tracer. | |
6114 | */ | |
6115 | if (is_root) { | |
4a15001e MD |
6116 | if (set_consumer_sockets(&kconsumer_data, rundir)) { |
6117 | retval = -1; | |
6118 | goto exit_init_data; | |
7753dea8 MD |
6119 | } |
6120 | ||
a88df331 | 6121 | /* Setup kernel tracer */ |
4fba7219 DG |
6122 | if (!opt_no_kernel) { |
6123 | init_kernel_tracer(); | |
89588270 DG |
6124 | if (kernel_tracer_fd >= 0) { |
6125 | ret = syscall_init_table(); | |
6126 | if (ret < 0) { | |
4a15001e MD |
6127 | ERR("Unable to populate syscall table. " |
6128 | "Syscall tracing won't work " | |
6129 | "for this session daemon."); | |
89588270 | 6130 | } |
834978fd | 6131 | } |
4fba7219 | 6132 | } |
a88df331 DG |
6133 | |
6134 | /* Set ulimit for open files */ | |
6135 | set_ulimit(); | |
fac6795d | 6136 | } |
4063050c MD |
6137 | /* init lttng_fd tracking must be done after set_ulimit. */ |
6138 | lttng_fd_init(); | |
fac6795d | 6139 | |
4a15001e MD |
6140 | if (set_consumer_sockets(&ustconsumer64_data, rundir)) { |
6141 | retval = -1; | |
6142 | goto exit_init_data; | |
67e40797 DG |
6143 | } |
6144 | ||
4a15001e MD |
6145 | if (set_consumer_sockets(&ustconsumer32_data, rundir)) { |
6146 | retval = -1; | |
6147 | goto exit_init_data; | |
67e40797 DG |
6148 | } |
6149 | ||
d6f42150 | 6150 | /* Setup the needed unix socket */ |
4a15001e MD |
6151 | if (init_daemon_socket()) { |
6152 | retval = -1; | |
6153 | goto exit_init_data; | |
fac6795d DG |
6154 | } |
6155 | ||
6156 | /* Set credentials to socket */ | |
4a15001e MD |
6157 | if (is_root && set_permissions(rundir)) { |
6158 | retval = -1; | |
6159 | goto exit_init_data; | |
fac6795d DG |
6160 | } |
6161 | ||
5b8719f5 DG |
6162 | /* Get parent pid if -S, --sig-parent is specified. */ |
6163 | if (opt_sig_parent) { | |
6164 | ppid = getppid(); | |
6165 | } | |
6166 | ||
7a485870 | 6167 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 | 6168 | if (is_root && !opt_no_kernel) { |
4a15001e MD |
6169 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
6170 | retval = -1; | |
6171 | goto exit_init_data; | |
6620da75 | 6172 | } |
7a485870 DG |
6173 | } |
6174 | ||
099e26bd | 6175 | /* Setup the thread apps communication pipe. */ |
4a15001e MD |
6176 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
6177 | retval = -1; | |
6178 | goto exit_init_data; | |
099e26bd DG |
6179 | } |
6180 | ||
d0b96690 | 6181 | /* Setup the thread apps notify communication pipe. */ |
4a15001e MD |
6182 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
6183 | retval = -1; | |
6184 | goto exit_init_data; | |
d0b96690 DG |
6185 | } |
6186 | ||
7972aab2 DG |
6187 | /* Initialize global buffer per UID and PID registry. */ |
6188 | buffer_reg_init_uid_registry(); | |
6189 | buffer_reg_init_pid_registry(); | |
6190 | ||
099e26bd | 6191 | /* Init UST command queue. */ |
8bdee6e2 | 6192 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 6193 | |
273ea72c | 6194 | /* |
4a15001e MD |
6195 | * Get session list pointer. This pointer MUST NOT be free'd. This list |
6196 | * is statically declared in session.c | |
273ea72c | 6197 | */ |
54d01ffb | 6198 | session_list_ptr = session_get_list(); |
b5541356 | 6199 | |
2f77fc4b | 6200 | cmd_init(); |
00e2e675 | 6201 | |
ae9e45b3 DG |
6202 | /* Check for the application socket timeout env variable. */ |
6203 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
6204 | if (env_app_timeout) { | |
6205 | app_socket_timeout = atoi(env_app_timeout); | |
6206 | } else { | |
6207 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
6208 | } | |
6209 | ||
4a15001e MD |
6210 | ret = write_pidfile(); |
6211 | if (ret) { | |
6212 | ERR("Error in write_pidfile"); | |
6213 | retval = -1; | |
6214 | goto exit_init_data; | |
6215 | } | |
6216 | ret = write_agent_port(); | |
6217 | if (ret) { | |
6218 | ERR("Error in write_agent_port"); | |
6219 | retval = -1; | |
6220 | goto exit_init_data; | |
6221 | } | |
35f90c40 | 6222 | |
554831e7 MD |
6223 | /* Initialize communication library */ |
6224 | lttcomm_init(); | |
4a15001e | 6225 | /* Initialize TCP timeout values */ |
d831c249 | 6226 | lttcomm_inet_init(); |
554831e7 | 6227 | |
ef367a93 | 6228 | if (load_session_init_data(&load_info) < 0) { |
4a15001e MD |
6229 | retval = -1; |
6230 | goto exit_init_data; | |
ef367a93 JG |
6231 | } |
6232 | load_info->path = opt_load_session_path; | |
6233 | ||
d5b9fd2f | 6234 | /* Create health-check thread */ |
1a1a34b4 | 6235 | ret = pthread_create(&health_thread, default_pthread_attr(), |
44a5e5eb | 6236 | thread_manage_health, (void *) NULL); |
4a15001e MD |
6237 | if (ret) { |
6238 | errno = ret; | |
44a5e5eb | 6239 | PERROR("pthread_create health"); |
4a15001e | 6240 | retval = -1; |
44a5e5eb DG |
6241 | goto exit_health; |
6242 | } | |
6243 | ||
cf3af59e | 6244 | /* Create thread to manage the client socket */ |
1a1a34b4 | 6245 | ret = pthread_create(&client_thread, default_pthread_attr(), |
099e26bd | 6246 | thread_manage_clients, (void *) NULL); |
4a15001e MD |
6247 | if (ret) { |
6248 | errno = ret; | |
76d7553f | 6249 | PERROR("pthread_create clients"); |
4a15001e | 6250 | retval = -1; |
cf3af59e MD |
6251 | goto exit_client; |
6252 | } | |
fac6795d | 6253 | |
099e26bd | 6254 | /* Create thread to dispatch registration */ |
1a1a34b4 | 6255 | ret = pthread_create(&dispatch_thread, default_pthread_attr(), |
099e26bd | 6256 | thread_dispatch_ust_registration, (void *) NULL); |
4a15001e MD |
6257 | if (ret) { |
6258 | errno = ret; | |
76d7553f | 6259 | PERROR("pthread_create dispatch"); |
4a15001e | 6260 | retval = -1; |
099e26bd DG |
6261 | goto exit_dispatch; |
6262 | } | |
6263 | ||
6264 | /* Create thread to manage application registration. */ | |
1a1a34b4 | 6265 | ret = pthread_create(®_apps_thread, default_pthread_attr(), |
099e26bd | 6266 | thread_registration_apps, (void *) NULL); |
4a15001e MD |
6267 | if (ret) { |
6268 | errno = ret; | |
76d7553f | 6269 | PERROR("pthread_create registration"); |
4a15001e | 6270 | retval = -1; |
099e26bd DG |
6271 | goto exit_reg_apps; |
6272 | } | |
6273 | ||
cf3af59e | 6274 | /* Create thread to manage application socket */ |
1a1a34b4 | 6275 | ret = pthread_create(&apps_thread, default_pthread_attr(), |
54d01ffb | 6276 | thread_manage_apps, (void *) NULL); |
4a15001e MD |
6277 | if (ret) { |
6278 | errno = ret; | |
d0b96690 | 6279 | PERROR("pthread_create apps"); |
4a15001e | 6280 | retval = -1; |
d0b96690 DG |
6281 | goto exit_apps; |
6282 | } | |
6283 | ||
6284 | /* Create thread to manage application notify socket */ | |
1a1a34b4 | 6285 | ret = pthread_create(&apps_notify_thread, default_pthread_attr(), |
d0b96690 | 6286 | ust_thread_manage_notify, (void *) NULL); |
4a15001e MD |
6287 | if (ret) { |
6288 | errno = ret; | |
f5c32ef1 | 6289 | PERROR("pthread_create notify"); |
4a15001e | 6290 | retval = -1; |
9563b0ad | 6291 | goto exit_apps_notify; |
cf3af59e | 6292 | } |
fac6795d | 6293 | |
022d91ba | 6294 | /* Create agent registration thread. */ |
1a1a34b4 | 6295 | ret = pthread_create(&agent_reg_thread, default_pthread_attr(), |
022d91ba | 6296 | agent_thread_manage_registration, (void *) NULL); |
4a15001e MD |
6297 | if (ret) { |
6298 | errno = ret; | |
022d91ba | 6299 | PERROR("pthread_create agent"); |
4a15001e | 6300 | retval = -1; |
022d91ba | 6301 | goto exit_agent_reg; |
4d076222 DG |
6302 | } |
6303 | ||
6620da75 DG |
6304 | /* Don't start this thread if kernel tracing is not requested nor root */ |
6305 | if (is_root && !opt_no_kernel) { | |
6306 | /* Create kernel thread to manage kernel event */ | |
1a1a34b4 | 6307 | ret = pthread_create(&kernel_thread, default_pthread_attr(), |
6620da75 | 6308 | thread_manage_kernel, (void *) NULL); |
4a15001e MD |
6309 | if (ret) { |
6310 | errno = ret; | |
6620da75 | 6311 | PERROR("pthread_create kernel"); |
4a15001e | 6312 | retval = -1; |
6620da75 DG |
6313 | goto exit_kernel; |
6314 | } | |
ef367a93 | 6315 | } |
7a485870 | 6316 | |
4a15001e | 6317 | /* Create session loading thread. */ |
1a1a34b4 MJ |
6318 | ret = pthread_create(&load_session_thread, default_pthread_attr(), |
6319 | thread_load_session, load_info); | |
4a15001e MD |
6320 | if (ret) { |
6321 | errno = ret; | |
6322 | PERROR("pthread_create load_session_thread"); | |
6323 | retval = -1; | |
6324 | goto exit_load_session; | |
6325 | } | |
6326 | ||
6327 | /* | |
6328 | * This is where we start awaiting program completion (e.g. through | |
6329 | * signal that asks threads to teardown). | |
6330 | */ | |
6331 | ||
6332 | ret = pthread_join(load_session_thread, &status); | |
6333 | if (ret) { | |
6334 | errno = ret; | |
6335 | PERROR("pthread_join load_session_thread"); | |
6336 | retval = -1; | |
6337 | } | |
6338 | exit_load_session: | |
ef367a93 JG |
6339 | |
6340 | if (is_root && !opt_no_kernel) { | |
6620da75 | 6341 | ret = pthread_join(kernel_thread, &status); |
4a15001e MD |
6342 | if (ret) { |
6343 | errno = ret; | |
6620da75 | 6344 | PERROR("pthread_join"); |
4a15001e | 6345 | retval = -1; |
6620da75 | 6346 | } |
fac6795d | 6347 | } |
cf3af59e | 6348 | exit_kernel: |
4a15001e | 6349 | |
022d91ba | 6350 | ret = pthread_join(agent_reg_thread, &status); |
4a15001e MD |
6351 | if (ret) { |
6352 | errno = ret; | |
022d91ba | 6353 | PERROR("pthread_join agent"); |
4a15001e | 6354 | retval = -1; |
4d076222 | 6355 | } |
022d91ba | 6356 | exit_agent_reg: |
4a15001e | 6357 | |
9563b0ad | 6358 | ret = pthread_join(apps_notify_thread, &status); |
4a15001e MD |
6359 | if (ret) { |
6360 | errno = ret; | |
9563b0ad | 6361 | PERROR("pthread_join apps notify"); |
4a15001e | 6362 | retval = -1; |
9563b0ad | 6363 | } |
9563b0ad | 6364 | exit_apps_notify: |
4a15001e | 6365 | |
cf3af59e | 6366 | ret = pthread_join(apps_thread, &status); |
4a15001e MD |
6367 | if (ret) { |
6368 | errno = ret; | |
9563b0ad | 6369 | PERROR("pthread_join apps"); |
4a15001e | 6370 | retval = -1; |
cf3af59e | 6371 | } |
cf3af59e | 6372 | exit_apps: |
4a15001e | 6373 | |
099e26bd | 6374 | ret = pthread_join(reg_apps_thread, &status); |
4a15001e MD |
6375 | if (ret) { |
6376 | errno = ret; | |
76d7553f | 6377 | PERROR("pthread_join"); |
4a15001e | 6378 | retval = -1; |
099e26bd | 6379 | } |
099e26bd | 6380 | exit_reg_apps: |
4a15001e | 6381 | |
772b8f4d MD |
6382 | /* |
6383 | * Join dispatch thread after joining reg_apps_thread to ensure | |
6384 | * we don't leak applications in the queue. | |
6385 | */ | |
099e26bd | 6386 | ret = pthread_join(dispatch_thread, &status); |
4a15001e MD |
6387 | if (ret) { |
6388 | errno = ret; | |
76d7553f | 6389 | PERROR("pthread_join"); |
4a15001e | 6390 | retval = -1; |
099e26bd | 6391 | } |
099e26bd | 6392 | exit_dispatch: |
4a15001e | 6393 | |
cf3af59e | 6394 | ret = pthread_join(client_thread, &status); |
4a15001e MD |
6395 | if (ret) { |
6396 | errno = ret; | |
76d7553f | 6397 | PERROR("pthread_join"); |
4a15001e | 6398 | retval = -1; |
cf3af59e | 6399 | } |
4a15001e | 6400 | exit_client: |
a88df331 | 6401 | |
4a15001e MD |
6402 | ret = pthread_join(health_thread, &status); |
6403 | if (ret) { | |
6404 | errno = ret; | |
6405 | PERROR("pthread_join health thread"); | |
6406 | retval = -1; | |
06f525de | 6407 | } |
4a15001e | 6408 | exit_health: |
06f525de | 6409 | |
4a15001e | 6410 | exit_init_data: |
2668465a MD |
6411 | /* |
6412 | * Wait for all pending call_rcu work to complete before tearing | |
6413 | * down data structures. call_rcu worker may be trying to | |
6414 | * perform lookups in those structures. | |
6415 | */ | |
6416 | rcu_barrier(); | |
4a15001e MD |
6417 | /* |
6418 | * sessiond_cleanup() is called when no other thread is running, except | |
6419 | * the ht_cleanup thread, which is needed to destroy the hash tables. | |
6420 | */ | |
6421 | rcu_thread_online(); | |
6422 | sessiond_cleanup(); | |
6423 | rcu_thread_offline(); | |
6424 | rcu_unregister_thread(); | |
06f525de | 6425 | |
c4d5de9d JG |
6426 | /* |
6427 | * Ensure all prior call_rcu are done. call_rcu callbacks may push | |
6428 | * hash tables to the ht_cleanup thread. Therefore, we ensure that | |
6429 | * the queue is empty before shutting down the clean-up thread. | |
6430 | */ | |
6431 | rcu_barrier(); | |
6432 | ||
5e97de00 | 6433 | ret = fini_ht_cleanup_thread(&ht_cleanup_thread); |
4a15001e | 6434 | if (ret) { |
4a15001e | 6435 | retval = -1; |
0b2dc8df MD |
6436 | } |
6437 | exit_ht_cleanup: | |
4a15001e | 6438 | |
4a15001e MD |
6439 | health_app_destroy(health_sessiond); |
6440 | exit_health_sessiond_cleanup: | |
7567352f | 6441 | exit_create_run_as_worker_cleanup: |
4a15001e MD |
6442 | |
6443 | exit_options: | |
6444 | sessiond_cleanup_options(); | |
6445 | ||
6446 | exit_set_signal_handler: | |
0658924e | 6447 | |
4a15001e | 6448 | if (!retval) { |
cf3af59e | 6449 | exit(EXIT_SUCCESS); |
4a15001e MD |
6450 | } else { |
6451 | exit(EXIT_FAILURE); | |
67e40797 | 6452 | } |
fac6795d | 6453 | } |