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> |
fac6795d | 52 | |
10a8a223 | 53 | #include "lttng-sessiond.h" |
7972aab2 | 54 | #include "buffer-registry.h" |
54d01ffb | 55 | #include "channel.h" |
2f77fc4b | 56 | #include "cmd.h" |
00e2e675 | 57 | #include "consumer.h" |
099e26bd | 58 | #include "context.h" |
54d01ffb | 59 | #include "event.h" |
4771f025 | 60 | #include "kernel.h" |
f1e16794 | 61 | #include "kernel-consumer.h" |
096102bd | 62 | #include "modprobe.h" |
0fdd1e2c | 63 | #include "shm.h" |
1e307fab | 64 | #include "ust-ctl.h" |
00e2e675 | 65 | #include "ust-consumer.h" |
8e68d1c8 | 66 | #include "utils.h" |
4063050c | 67 | #include "fd-limit.h" |
8782cc74 | 68 | #include "health-sessiond.h" |
8ac94142 | 69 | #include "testpoint.h" |
d0b96690 | 70 | #include "ust-thread.h" |
022d91ba | 71 | #include "agent-thread.h" |
fb198a11 | 72 | #include "save.h" |
ef367a93 | 73 | #include "load-session-thread.h" |
b3530820 JG |
74 | #include "notification-thread.h" |
75 | #include "notification-thread-commands.h" | |
834978fd | 76 | #include "syscall.h" |
7c1d2758 | 77 | #include "agent.h" |
5e97de00 | 78 | #include "ht-cleanup.h" |
87c3f04b | 79 | #include "sessiond-config.h" |
e8526e3f | 80 | #include "clear.h" |
ebaeda94 | 81 | |
4fc83d94 PP |
82 | static const char *help_msg = |
83 | #ifdef LTTNG_EMBED_HELP | |
84 | #include <lttng-sessiond.8.h> | |
85 | #else | |
86 | NULL | |
87 | #endif | |
88 | ; | |
89 | ||
fac6795d | 90 | const char *progname; |
1d4b027a | 91 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
0bb7724a | 92 | static pid_t child_ppid; /* Internal parent PID use with daemonize. */ |
c9cb3e7d | 93 | static int lockfile_fd = -1; |
3bd1e081 | 94 | |
0bb7724a DG |
95 | /* Set to 1 when a SIGUSR1 signal is received. */ |
96 | static int recv_child_signal; | |
97 | ||
a23ec3a7 DG |
98 | /* |
99 | * Consumer daemon specific control data. Every value not initialized here is | |
100 | * set to 0 by the static definition. | |
101 | */ | |
3bd1e081 MD |
102 | static struct consumer_data kconsumer_data = { |
103 | .type = LTTNG_CONSUMER_KERNEL, | |
03550b58 MD |
104 | .err_sock = -1, |
105 | .cmd_sock = -1, | |
b3530820 | 106 | .channel_monitor_pipe = -1, |
173af62f DG |
107 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
108 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
109 | .cond = PTHREAD_COND_INITIALIZER, |
110 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 111 | }; |
7753dea8 MD |
112 | static struct consumer_data ustconsumer64_data = { |
113 | .type = LTTNG_CONSUMER64_UST, | |
03550b58 MD |
114 | .err_sock = -1, |
115 | .cmd_sock = -1, | |
b3530820 | 116 | .channel_monitor_pipe = -1, |
173af62f DG |
117 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
118 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
119 | .cond = PTHREAD_COND_INITIALIZER, |
120 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
121 | }; |
122 | static struct consumer_data ustconsumer32_data = { | |
123 | .type = LTTNG_CONSUMER32_UST, | |
03550b58 MD |
124 | .err_sock = -1, |
125 | .cmd_sock = -1, | |
b3530820 | 126 | .channel_monitor_pipe = -1, |
173af62f DG |
127 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
128 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
129 | .cond = PTHREAD_COND_INITIALIZER, |
130 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
131 | }; |
132 | ||
26296c48 JG |
133 | /* Command line options */ |
134 | static const struct option long_options[] = { | |
0f5ea17c JG |
135 | { "client-sock", required_argument, 0, 'c' }, |
136 | { "apps-sock", required_argument, 0, 'a' }, | |
137 | { "kconsumerd-cmd-sock", required_argument, 0, '\0' }, | |
138 | { "kconsumerd-err-sock", required_argument, 0, '\0' }, | |
139 | { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' }, | |
140 | { "ustconsumerd32-err-sock", required_argument, 0, '\0' }, | |
141 | { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' }, | |
142 | { "ustconsumerd64-err-sock", required_argument, 0, '\0' }, | |
143 | { "consumerd32-path", required_argument, 0, '\0' }, | |
144 | { "consumerd32-libdir", required_argument, 0, '\0' }, | |
145 | { "consumerd64-path", required_argument, 0, '\0' }, | |
146 | { "consumerd64-libdir", required_argument, 0, '\0' }, | |
147 | { "daemonize", no_argument, 0, 'd' }, | |
148 | { "background", no_argument, 0, 'b' }, | |
149 | { "sig-parent", no_argument, 0, 'S' }, | |
150 | { "help", no_argument, 0, 'h' }, | |
151 | { "group", required_argument, 0, 'g' }, | |
152 | { "version", no_argument, 0, 'V' }, | |
153 | { "quiet", no_argument, 0, 'q' }, | |
154 | { "verbose", no_argument, 0, 'v' }, | |
155 | { "verbose-consumer", no_argument, 0, '\0' }, | |
156 | { "no-kernel", no_argument, 0, '\0' }, | |
157 | { "pidfile", required_argument, 0, 'p' }, | |
158 | { "agent-tcp-port", required_argument, 0, '\0' }, | |
159 | { "config", required_argument, 0, 'f' }, | |
160 | { "load", required_argument, 0, 'l' }, | |
161 | { "kmod-probes", required_argument, 0, '\0' }, | |
162 | { "extra-kmod-probes", required_argument, 0, '\0' }, | |
26296c48 JG |
163 | { NULL, 0, 0, 0 } |
164 | }; | |
165 | ||
87c3f04b JG |
166 | struct sessiond_config config; |
167 | ||
26296c48 JG |
168 | /* Command line options to ignore from configuration file */ |
169 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
170 | ||
26c9d55e | 171 | /* Shared between threads */ |
099e26bd | 172 | static int dispatch_thread_exit; |
fac6795d | 173 | |
1d4b027a | 174 | /* Sockets and FDs */ |
a4b35e07 MD |
175 | static int client_sock = -1; |
176 | static int apps_sock = -1; | |
2f77fc4b | 177 | int kernel_tracer_fd = -1; |
76d7553f | 178 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 179 | |
273ea72c DG |
180 | /* |
181 | * Quit pipe for all threads. This permits a single cancellation point | |
182 | * for all threads when receiving an event on the pipe. | |
183 | */ | |
76d7553f | 184 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 185 | |
099e26bd DG |
186 | /* |
187 | * This pipe is used to inform the thread managing application communication | |
188 | * that a command is queued and ready to be processed. | |
189 | */ | |
76d7553f | 190 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 191 | |
d0b96690 DG |
192 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
193 | ||
1d4b027a | 194 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 195 | static pthread_t apps_thread; |
d0b96690 | 196 | static pthread_t apps_notify_thread; |
099e26bd | 197 | static pthread_t reg_apps_thread; |
1d4b027a | 198 | static pthread_t client_thread; |
7a485870 | 199 | static pthread_t kernel_thread; |
099e26bd | 200 | static pthread_t dispatch_thread; |
44a5e5eb | 201 | static pthread_t health_thread; |
0b2dc8df | 202 | static pthread_t ht_cleanup_thread; |
022d91ba | 203 | static pthread_t agent_reg_thread; |
ef367a93 | 204 | static pthread_t load_session_thread; |
b3530820 | 205 | static pthread_t notification_thread; |
5eb91c98 | 206 | |
099e26bd DG |
207 | /* |
208 | * UST registration command queue. This queue is tied with a futex and uses a N | |
209 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
210 | * | |
b22c5da8 DG |
211 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
212 | * queue along with the wait/wake scheme. The thread_manage_apps receives down | |
213 | * the line new application socket and monitors it for any I/O error or clean | |
214 | * close that triggers an unregistration of the application. | |
099e26bd DG |
215 | */ |
216 | static struct ust_cmd_queue ust_cmd_queue; | |
217 | ||
b5541356 DG |
218 | /* |
219 | * Pointer initialized before thread creation. | |
220 | * | |
221 | * This points to the tracing session list containing the session count and a | |
222 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
223 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 224 | * |
d063d709 | 225 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 226 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
227 | */ |
228 | static struct ltt_session_list *session_list_ptr; | |
229 | ||
7753dea8 MD |
230 | int ust_consumerd64_fd = -1; |
231 | int ust_consumerd32_fd = -1; | |
232 | ||
2f77fc4b DG |
233 | static const char *module_proc_lttng = "/proc/lttng"; |
234 | ||
5c827ce0 DG |
235 | /* |
236 | * Consumer daemon state which is changed when spawning it, killing it or in | |
237 | * case of a fatal error. | |
238 | */ | |
239 | enum consumerd_state { | |
240 | CONSUMER_STARTED = 1, | |
241 | CONSUMER_STOPPED = 2, | |
242 | CONSUMER_ERROR = 3, | |
243 | }; | |
244 | ||
245 | /* | |
246 | * This consumer daemon state is used to validate if a client command will be | |
247 | * able to reach the consumer. If not, the client is informed. For instance, | |
248 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
249 | * error to the client. | |
250 | * | |
251 | * The following example shows a possible race condition of this scheme: | |
252 | * | |
253 | * consumer thread error happens | |
254 | * client cmd arrives | |
255 | * client cmd checks state -> still OK | |
256 | * consumer thread exit, sets error | |
257 | * client cmd try to talk to consumer | |
258 | * ... | |
259 | * | |
260 | * However, since the consumer is a different daemon, we have no way of making | |
261 | * sure the command will reach it safely even with this state flag. This is why | |
262 | * we consider that up to the state validation during command processing, the | |
263 | * command is safe. After that, we can not guarantee the correctness of the | |
264 | * client request vis-a-vis the consumer. | |
265 | */ | |
266 | static enum consumerd_state ust_consumerd_state; | |
267 | static enum consumerd_state kernel_consumerd_state; | |
268 | ||
12744796 DG |
269 | /* Set in main() with the current page size. */ |
270 | long page_size; | |
271 | ||
8782cc74 MD |
272 | /* Application health monitoring */ |
273 | struct health_app *health_sessiond; | |
274 | ||
f43f95a9 DG |
275 | /* Am I root or not. */ |
276 | int is_root; /* Set to 1 if the daemon is running as root */ | |
277 | ||
26296c48 JG |
278 | const char * const config_section_name = "sessiond"; |
279 | ||
ef367a93 JG |
280 | /* Load session thread information to operate. */ |
281 | struct load_session_thread_data *load_info; | |
282 | ||
b3530820 JG |
283 | /* Notification thread handle. */ |
284 | struct notification_thread_handle *notification_thread_handle; | |
285 | ||
7c1d2758 JG |
286 | /* Global hash tables */ |
287 | struct lttng_ht *agent_apps_ht_by_sock = NULL; | |
288 | ||
97bc1426 | 289 | /* |
3c3c4e5c JG |
290 | * The initialization of the session daemon is done in multiple phases. |
291 | * | |
292 | * While all threads are launched near-simultaneously, only some of them | |
293 | * are needed to ensure the session daemon can start to respond to client | |
b3530820 | 294 | * requests. |
3c3c4e5c JG |
295 | * |
296 | * There are two important guarantees that we wish to offer with respect | |
297 | * to the initialisation of the session daemon: | |
298 | * - When the daemonize/background launcher process exits, the sessiond | |
299 | * is fully able to respond to client requests, | |
300 | * - Auto-loaded sessions are visible to clients. | |
301 | * | |
302 | * In order to achieve this, a number of support threads have to be launched | |
303 | * to allow the "client" thread to function properly. Moreover, since the | |
304 | * "load session" thread needs the client thread, we must provide a way | |
305 | * for the "load session" thread to know that the "client" thread is up | |
306 | * and running. | |
307 | * | |
308 | * Hence, the support threads decrement the lttng_sessiond_ready counter | |
309 | * while the "client" threads waits for it to reach 0. Once the "client" thread | |
310 | * unblocks, it posts the message_thread_ready semaphore which allows the | |
311 | * "load session" thread to progress. | |
312 | * | |
313 | * This implies that the "load session" thread is the last to be initialized | |
314 | * and will explicitly call sessiond_signal_parents(), which signals the parents | |
315 | * that the session daemon is fully initialized. | |
316 | * | |
317 | * The three (3) support threads are: | |
318 | * - agent_thread | |
319 | * - notification_thread | |
320 | * - health_thread | |
97bc1426 | 321 | */ |
3c3c4e5c | 322 | int lttng_sessiond_ready = 3; |
97bc1426 | 323 | |
5e97de00 JG |
324 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
325 | { | |
326 | return (fd == thread_quit_pipe[0] && (events & LPOLLIN)) ? 1 : 0; | |
327 | } | |
328 | ||
97bc1426 | 329 | /* Notify parents that we are ready for cmd and health check */ |
ef367a93 | 330 | LTTNG_HIDDEN |
3c3c4e5c | 331 | void sessiond_signal_parents(void) |
97bc1426 | 332 | { |
3c3c4e5c JG |
333 | /* |
334 | * Notify parent pid that we are ready to accept command | |
335 | * for client side. This ppid is the one from the | |
336 | * external process that spawned us. | |
337 | */ | |
338 | if (config.sig_parent) { | |
339 | kill(ppid, SIGUSR1); | |
340 | } | |
97bc1426 | 341 | |
3c3c4e5c JG |
342 | /* |
343 | * Notify the parent of the fork() process that we are | |
344 | * ready. | |
345 | */ | |
346 | if (config.daemonize || config.background) { | |
347 | kill(child_ppid, SIGUSR1); | |
97bc1426 MD |
348 | } |
349 | } | |
350 | ||
3c3c4e5c JG |
351 | LTTNG_HIDDEN |
352 | void sessiond_notify_ready(void) | |
353 | { | |
354 | /* | |
355 | * The _return variant is used since the implied memory barriers are | |
356 | * required. | |
357 | */ | |
358 | (void) uatomic_sub_return(<tng_sessiond_ready, 1); | |
359 | } | |
360 | ||
4a15001e MD |
361 | static |
362 | int __sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size, | |
363 | int *a_pipe) | |
5eb91c98 DG |
364 | { |
365 | int ret; | |
366 | ||
d0b96690 | 367 | assert(events); |
5eb91c98 DG |
368 | |
369 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
370 | if (ret < 0) { | |
371 | goto error; | |
372 | } | |
373 | ||
374 | /* Add quit pipe */ | |
4a15001e | 375 | ret = lttng_poll_add(events, a_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
376 | if (ret < 0) { |
377 | goto error; | |
378 | } | |
379 | ||
380 | return 0; | |
381 | ||
382 | error: | |
383 | return ret; | |
384 | } | |
385 | ||
4a15001e MD |
386 | /* |
387 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
388 | */ | |
389 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) | |
390 | { | |
391 | return __sessiond_set_thread_pollset(events, size, thread_quit_pipe); | |
392 | } | |
393 | ||
273ea72c | 394 | /* |
5eb91c98 | 395 | * Init thread quit pipe. |
273ea72c DG |
396 | * |
397 | * Return -1 on error or 0 if all pipes are created. | |
398 | */ | |
4a15001e | 399 | static int __init_thread_quit_pipe(int *a_pipe) |
273ea72c | 400 | { |
730389d9 | 401 | int ret, i; |
273ea72c | 402 | |
4a15001e | 403 | ret = pipe(a_pipe); |
273ea72c | 404 | if (ret < 0) { |
730389d9 | 405 | PERROR("thread quit pipe"); |
273ea72c DG |
406 | goto error; |
407 | } | |
408 | ||
730389d9 | 409 | for (i = 0; i < 2; i++) { |
4a15001e | 410 | ret = fcntl(a_pipe[i], F_SETFD, FD_CLOEXEC); |
730389d9 DG |
411 | if (ret < 0) { |
412 | PERROR("fcntl"); | |
413 | goto error; | |
414 | } | |
415 | } | |
416 | ||
273ea72c DG |
417 | error: |
418 | return ret; | |
419 | } | |
420 | ||
4a15001e MD |
421 | static int init_thread_quit_pipe(void) |
422 | { | |
423 | return __init_thread_quit_pipe(thread_quit_pipe); | |
424 | } | |
425 | ||
099e26bd DG |
426 | /* |
427 | * Stop all threads by closing the thread quit pipe. | |
428 | */ | |
cf3af59e MD |
429 | static void stop_threads(void) |
430 | { | |
5eb91c98 DG |
431 | int ret; |
432 | ||
cf3af59e MD |
433 | /* Stopping all threads */ |
434 | DBG("Terminating all threads"); | |
54d01ffb | 435 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
436 | if (ret < 0) { |
437 | ERR("write error on thread quit pipe"); | |
438 | } | |
439 | ||
099e26bd | 440 | /* Dispatch thread */ |
26c9d55e | 441 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 442 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
443 | } |
444 | ||
e975f9f8 DG |
445 | /* |
446 | * Close every consumer sockets. | |
447 | */ | |
448 | static void close_consumer_sockets(void) | |
449 | { | |
450 | int ret; | |
451 | ||
452 | if (kconsumer_data.err_sock >= 0) { | |
453 | ret = close(kconsumer_data.err_sock); | |
454 | if (ret < 0) { | |
455 | PERROR("kernel consumer err_sock close"); | |
456 | } | |
457 | } | |
458 | if (ustconsumer32_data.err_sock >= 0) { | |
459 | ret = close(ustconsumer32_data.err_sock); | |
460 | if (ret < 0) { | |
a76cbd9f | 461 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
462 | } |
463 | } | |
464 | if (ustconsumer64_data.err_sock >= 0) { | |
465 | ret = close(ustconsumer64_data.err_sock); | |
466 | if (ret < 0) { | |
a76cbd9f | 467 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
468 | } |
469 | } | |
470 | if (kconsumer_data.cmd_sock >= 0) { | |
471 | ret = close(kconsumer_data.cmd_sock); | |
472 | if (ret < 0) { | |
473 | PERROR("kernel consumer cmd_sock close"); | |
474 | } | |
475 | } | |
476 | if (ustconsumer32_data.cmd_sock >= 0) { | |
477 | ret = close(ustconsumer32_data.cmd_sock); | |
478 | if (ret < 0) { | |
a76cbd9f | 479 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
480 | } |
481 | } | |
482 | if (ustconsumer64_data.cmd_sock >= 0) { | |
483 | ret = close(ustconsumer64_data.cmd_sock); | |
484 | if (ret < 0) { | |
a76cbd9f | 485 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
486 | } |
487 | } | |
b3530820 JG |
488 | if (kconsumer_data.channel_monitor_pipe >= 0) { |
489 | ret = close(kconsumer_data.channel_monitor_pipe); | |
490 | if (ret < 0) { | |
491 | PERROR("kernel consumer channel monitor pipe close"); | |
492 | } | |
493 | } | |
494 | if (ustconsumer32_data.channel_monitor_pipe >= 0) { | |
495 | ret = close(ustconsumer32_data.channel_monitor_pipe); | |
496 | if (ret < 0) { | |
497 | PERROR("UST consumerd32 channel monitor pipe close"); | |
498 | } | |
499 | } | |
500 | if (ustconsumer64_data.channel_monitor_pipe >= 0) { | |
501 | ret = close(ustconsumer64_data.channel_monitor_pipe); | |
502 | if (ret < 0) { | |
503 | PERROR("UST consumerd64 channel monitor pipe close"); | |
504 | } | |
505 | } | |
e975f9f8 DG |
506 | } |
507 | ||
4e4714cb JR |
508 | /* |
509 | * Wait on consumer process termination. | |
510 | * | |
511 | * Need to be called with the consumer data lock held or from a context | |
512 | * ensuring no concurrent access to data (e.g: cleanup). | |
513 | */ | |
514 | static void wait_consumer(struct consumer_data *consumer_data) | |
515 | { | |
516 | pid_t ret; | |
517 | int status; | |
518 | ||
519 | if (consumer_data->pid <= 0) { | |
520 | return; | |
521 | } | |
522 | ||
523 | DBG("Waiting for complete teardown of consumerd (PID: %d)", | |
524 | consumer_data->pid); | |
525 | ret = waitpid(consumer_data->pid, &status, 0); | |
526 | if (ret == -1) { | |
527 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) | |
eeccf346 | 528 | } else if (!WIFEXITED(status)) { |
4e4714cb JR |
529 | ERR("consumerd termination with error: %d", |
530 | WEXITSTATUS(ret)); | |
531 | } | |
532 | consumer_data->pid = 0; | |
533 | } | |
534 | ||
fac6795d | 535 | /* |
4a15001e | 536 | * Cleanup the session daemon's data structures. |
fac6795d | 537 | */ |
4a15001e | 538 | static void sessiond_cleanup(void) |
fac6795d | 539 | { |
ef599319 | 540 | int ret; |
af9737e9 | 541 | struct ltt_session *sess, *stmp; |
fac6795d | 542 | |
4a15001e | 543 | DBG("Cleanup sessiond"); |
e07ae692 | 544 | |
4e449f3f MD |
545 | /* |
546 | * Close the thread quit pipe. It has already done its job, | |
547 | * since we are now called. | |
548 | */ | |
2f77fc4b DG |
549 | utils_close_pipe(thread_quit_pipe); |
550 | ||
26a320c1 JG |
551 | ret = remove(config.pid_file_path.value); |
552 | if (ret < 0) { | |
553 | PERROR("remove pidfile %s", config.pid_file_path.value); | |
35f90c40 DG |
554 | } |
555 | ||
87c3f04b JG |
556 | DBG("Removing sessiond and consumerd content of directory %s", |
557 | config.rundir.value); | |
8c6c56c2 MD |
558 | |
559 | /* sessiond */ | |
87c3f04b JG |
560 | DBG("Removing %s", config.pid_file_path.value); |
561 | (void) unlink(config.pid_file_path.value); | |
8c6c56c2 | 562 | |
87c3f04b JG |
563 | DBG("Removing %s", config.agent_port_file_path.value); |
564 | (void) unlink(config.agent_port_file_path.value); | |
cd9290dd | 565 | |
8c6c56c2 | 566 | /* kconsumerd */ |
87c3f04b JG |
567 | DBG("Removing %s", kconsumer_data.err_unix_sock_path); |
568 | (void) unlink(kconsumer_data.err_unix_sock_path); | |
569 | ||
570 | DBG("Removing directory %s", config.kconsumerd_path.value); | |
571 | (void) rmdir(config.kconsumerd_path.value); | |
8c6c56c2 MD |
572 | |
573 | /* ust consumerd 32 */ | |
87c3f04b JG |
574 | DBG("Removing %s", config.consumerd32_err_unix_sock_path.value); |
575 | (void) unlink(config.consumerd32_err_unix_sock_path.value); | |
576 | ||
577 | DBG("Removing directory %s", config.consumerd32_path.value); | |
578 | (void) rmdir(config.consumerd32_path.value); | |
8c6c56c2 MD |
579 | |
580 | /* ust consumerd 64 */ | |
87c3f04b JG |
581 | DBG("Removing %s", config.consumerd64_err_unix_sock_path.value); |
582 | (void) unlink(config.consumerd64_err_unix_sock_path.value); | |
583 | ||
584 | DBG("Removing directory %s", config.consumerd64_path.value); | |
585 | (void) rmdir(config.consumerd64_path.value); | |
5461b305 | 586 | |
99bab54f | 587 | DBG("Cleaning up all sessions"); |
fac6795d | 588 | |
b5541356 | 589 | /* Destroy session list mutex */ |
273ea72c DG |
590 | if (session_list_ptr != NULL) { |
591 | pthread_mutex_destroy(&session_list_ptr->lock); | |
592 | ||
593 | /* Cleanup ALL session */ | |
54d01ffb DG |
594 | cds_list_for_each_entry_safe(sess, stmp, |
595 | &session_list_ptr->head, list) { | |
2f77fc4b | 596 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
597 | } |
598 | } | |
599 | ||
4e4714cb JR |
600 | wait_consumer(&kconsumer_data); |
601 | wait_consumer(&ustconsumer64_data); | |
602 | wait_consumer(&ustconsumer32_data); | |
603 | ||
6a4e4039 JG |
604 | DBG("Cleaning up all agent apps"); |
605 | agent_app_ht_clean(); | |
606 | ||
099e26bd | 607 | DBG("Closing all UST sockets"); |
56fff090 | 608 | ust_app_clean_list(); |
7972aab2 | 609 | buffer_reg_destroy_registries(); |
099e26bd | 610 | |
87c3f04b | 611 | if (is_root && !config.no_kernel) { |
4fba7219 | 612 | DBG2("Closing kernel fd"); |
a4b35e07 | 613 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
614 | ret = close(kernel_tracer_fd); |
615 | if (ret) { | |
616 | PERROR("close"); | |
617 | } | |
a4b35e07 | 618 | } |
2f50c8a3 | 619 | DBG("Unloading kernel modules"); |
096102bd | 620 | modprobe_remove_lttng_all(); |
834978fd | 621 | free(syscall_table); |
2f50c8a3 | 622 | } |
2f77fc4b | 623 | |
e975f9f8 DG |
624 | close_consumer_sockets(); |
625 | ||
ef367a93 JG |
626 | if (load_info) { |
627 | load_session_destroy_data(load_info); | |
628 | free(load_info); | |
629 | } | |
630 | ||
c9cb3e7d JG |
631 | /* |
632 | * We do NOT rmdir rundir because there are other processes | |
633 | * using it, for instance lttng-relayd, which can start in | |
634 | * parallel with this teardown. | |
635 | */ | |
4a15001e MD |
636 | } |
637 | ||
638 | /* | |
639 | * Cleanup the daemon's option data structures. | |
640 | */ | |
641 | static void sessiond_cleanup_options(void) | |
642 | { | |
643 | DBG("Cleaning up options"); | |
644 | ||
87c3f04b | 645 | sessiond_config_fini(&config); |
c9cb3e7d | 646 | |
7567352f | 647 | run_as_destroy_worker(); |
fac6795d DG |
648 | } |
649 | ||
e065084a | 650 | /* |
d063d709 | 651 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 652 | * |
d063d709 | 653 | * Return lttcomm error code. |
e065084a DG |
654 | */ |
655 | static int send_unix_sock(int sock, void *buf, size_t len) | |
656 | { | |
657 | /* Check valid length */ | |
c617c0c6 | 658 | if (len == 0) { |
e065084a DG |
659 | return -1; |
660 | } | |
661 | ||
662 | return lttcomm_send_unix_sock(sock, buf, len); | |
663 | } | |
664 | ||
5461b305 | 665 | /* |
d063d709 | 666 | * Free memory of a command context structure. |
5461b305 | 667 | */ |
a2fb29a5 | 668 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 669 | { |
a2fb29a5 DG |
670 | DBG("Clean command context structure"); |
671 | if (*cmd_ctx) { | |
672 | if ((*cmd_ctx)->llm) { | |
673 | free((*cmd_ctx)->llm); | |
5461b305 | 674 | } |
a2fb29a5 DG |
675 | if ((*cmd_ctx)->lsm) { |
676 | free((*cmd_ctx)->lsm); | |
5461b305 | 677 | } |
a2fb29a5 DG |
678 | free(*cmd_ctx); |
679 | *cmd_ctx = NULL; | |
5461b305 DG |
680 | } |
681 | } | |
682 | ||
fac6795d | 683 | /* |
0fdd1e2c | 684 | * Notify UST applications using the shm mmap futex. |
fac6795d | 685 | */ |
0fdd1e2c | 686 | static int notify_ust_apps(int active) |
fac6795d | 687 | { |
0fdd1e2c | 688 | char *wait_shm_mmap; |
fac6795d | 689 | |
0fdd1e2c | 690 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 691 | |
0fdd1e2c | 692 | /* See shm.c for this call implying mmap, shm and futex calls */ |
87c3f04b | 693 | wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root); |
0fdd1e2c | 694 | if (wait_shm_mmap == NULL) { |
fac6795d DG |
695 | goto error; |
696 | } | |
697 | ||
0fdd1e2c DG |
698 | /* Wake waiting process */ |
699 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
700 | ||
701 | /* Apps notified successfully */ | |
702 | return 0; | |
fac6795d DG |
703 | |
704 | error: | |
0fdd1e2c | 705 | return -1; |
fac6795d DG |
706 | } |
707 | ||
e065084a | 708 | /* |
d063d709 DG |
709 | * Setup the outgoing data buffer for the response (llm) by allocating the |
710 | * right amount of memory and copying the original information from the lsm | |
711 | * structure. | |
ca95a216 | 712 | * |
6e10c9b9 | 713 | * Return 0 on success, negative value on error. |
ca95a216 | 714 | */ |
6e10c9b9 PP |
715 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
716 | const void *payload_buf, size_t payload_len, | |
717 | const void *cmd_header_buf, size_t cmd_header_len) | |
ca95a216 | 718 | { |
6e10c9b9 PP |
719 | int ret = 0; |
720 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
721 | const size_t cmd_header_offset = header_len; | |
722 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
723 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
ca95a216 | 724 | |
6e10c9b9 | 725 | cmd_ctx->llm = zmalloc(total_msg_size); |
5461b305 | 726 | |
5461b305 | 727 | if (cmd_ctx->llm == NULL) { |
76d7553f | 728 | PERROR("zmalloc"); |
5461b305 | 729 | ret = -ENOMEM; |
6e10c9b9 | 730 | goto end; |
ca95a216 DG |
731 | } |
732 | ||
5461b305 DG |
733 | /* Copy common data */ |
734 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 735 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
6e10c9b9 PP |
736 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
737 | cmd_ctx->llm->data_size = payload_len; | |
738 | cmd_ctx->lttng_msg_size = total_msg_size; | |
5461b305 | 739 | |
6e10c9b9 | 740 | /* Copy command header */ |
b4e3ceb9 PP |
741 | if (cmd_header_len) { |
742 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
743 | cmd_header_len); | |
744 | } | |
5461b305 | 745 | |
6e10c9b9 | 746 | /* Copy payload */ |
b4e3ceb9 PP |
747 | if (payload_len) { |
748 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
749 | payload_len); | |
750 | } | |
ca95a216 | 751 | |
6e10c9b9 | 752 | end: |
ca95a216 DG |
753 | return ret; |
754 | } | |
755 | ||
6e10c9b9 PP |
756 | /* |
757 | * Version of setup_lttng_msg() without command header. | |
758 | */ | |
759 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
760 | void *payload_buf, size_t payload_len) | |
761 | { | |
762 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
763 | } | |
7a485870 | 764 | /* |
5eb91c98 | 765 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 766 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 767 | */ |
5eb91c98 | 768 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 769 | { |
5eb91c98 | 770 | int ret; |
7a485870 DG |
771 | struct ltt_session *session; |
772 | struct ltt_kernel_channel *channel; | |
773 | ||
5eb91c98 | 774 | DBG("Updating kernel poll set"); |
7a485870 | 775 | |
54d01ffb | 776 | session_lock_list(); |
b5541356 | 777 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 778 | session_lock(session); |
7a485870 | 779 | if (session->kernel_session == NULL) { |
54d01ffb | 780 | session_unlock(session); |
7a485870 DG |
781 | continue; |
782 | } | |
7a485870 | 783 | |
54d01ffb DG |
784 | cds_list_for_each_entry(channel, |
785 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
786 | /* Add channel fd to the kernel poll set */ |
787 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
788 | if (ret < 0) { | |
54d01ffb | 789 | session_unlock(session); |
5eb91c98 DG |
790 | goto error; |
791 | } | |
792 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 793 | } |
54d01ffb | 794 | session_unlock(session); |
7a485870 | 795 | } |
54d01ffb | 796 | session_unlock_list(); |
7a485870 | 797 | |
5eb91c98 | 798 | return 0; |
7a485870 DG |
799 | |
800 | error: | |
54d01ffb | 801 | session_unlock_list(); |
7a485870 DG |
802 | return -1; |
803 | } | |
804 | ||
805 | /* | |
54d01ffb | 806 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 807 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 808 | * |
d063d709 | 809 | * Useful for CPU hotplug feature. |
7a485870 | 810 | */ |
2bdd86d4 | 811 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
812 | { |
813 | int ret = 0; | |
814 | struct ltt_session *session; | |
173af62f | 815 | struct ltt_kernel_session *ksess; |
7a485870 DG |
816 | struct ltt_kernel_channel *channel; |
817 | ||
818 | DBG("Updating kernel streams for channel fd %d", fd); | |
819 | ||
54d01ffb | 820 | session_lock_list(); |
b5541356 | 821 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 822 | session_lock(session); |
7a485870 | 823 | if (session->kernel_session == NULL) { |
54d01ffb | 824 | session_unlock(session); |
7a485870 DG |
825 | continue; |
826 | } | |
173af62f | 827 | ksess = session->kernel_session; |
d9800920 | 828 | |
4a15001e MD |
829 | cds_list_for_each_entry(channel, |
830 | &ksess->channel_list.head, list) { | |
831 | struct lttng_ht_iter iter; | |
832 | struct consumer_socket *socket; | |
d9800920 | 833 | |
4a15001e MD |
834 | if (channel->fd != fd) { |
835 | continue; | |
836 | } | |
837 | DBG("Channel found, updating kernel streams"); | |
838 | ret = kernel_open_channel_stream(channel); | |
839 | if (ret < 0) { | |
840 | goto error; | |
841 | } | |
842 | /* Update the stream global counter */ | |
843 | ksess->stream_count_global += ret; | |
844 | ||
845 | /* | |
846 | * Have we already sent fds to the consumer? If yes, it | |
847 | * means that tracing is started so it is safe to send | |
848 | * our updated stream fds. | |
849 | */ | |
850 | if (ksess->consumer_fds_sent != 1 | |
851 | || ksess->consumer == NULL) { | |
852 | ret = -1; | |
853 | goto error; | |
854 | } | |
855 | ||
856 | rcu_read_lock(); | |
857 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
858 | &iter.iter, socket, node.node) { | |
859 | pthread_mutex_lock(socket->lock); | |
860 | ret = kernel_consumer_send_channel_stream(socket, | |
861 | channel, ksess, | |
862 | session->output_traces ? 1 : 0); | |
863 | pthread_mutex_unlock(socket->lock); | |
864 | if (ret < 0) { | |
e7fe706f | 865 | rcu_read_unlock(); |
4a15001e | 866 | goto error; |
7a485870 | 867 | } |
7a485870 | 868 | } |
4a15001e | 869 | rcu_read_unlock(); |
7a485870 | 870 | } |
54d01ffb | 871 | session_unlock(session); |
7a485870 | 872 | } |
54d01ffb | 873 | session_unlock_list(); |
b3c750d2 | 874 | return ret; |
7a485870 | 875 | |
b3c750d2 | 876 | error: |
54d01ffb DG |
877 | session_unlock(session); |
878 | session_unlock_list(); | |
7a485870 DG |
879 | return ret; |
880 | } | |
881 | ||
487cf67c | 882 | /* |
ffe60014 DG |
883 | * For each tracing session, update newly registered apps. The session list |
884 | * lock MUST be acquired before calling this. | |
487cf67c DG |
885 | */ |
886 | static void update_ust_app(int app_sock) | |
887 | { | |
888 | struct ltt_session *sess, *stmp; | |
889 | ||
fdadac08 DG |
890 | /* Consumer is in an ERROR state. Stop any application update. */ |
891 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
892 | /* Stop the update process since the consumer is dead. */ | |
893 | return; | |
894 | } | |
895 | ||
487cf67c DG |
896 | /* For all tracing session(s) */ |
897 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
a9ad0c8f MD |
898 | struct ust_app *app; |
899 | ||
4ee14516 | 900 | session_lock(sess); |
a9ad0c8f MD |
901 | if (!sess->ust_session) { |
902 | goto unlock_session; | |
903 | } | |
904 | ||
905 | rcu_read_lock(); | |
906 | assert(app_sock >= 0); | |
907 | app = ust_app_find_by_sock(app_sock); | |
908 | if (app == NULL) { | |
909 | /* | |
910 | * Application can be unregistered before so | |
911 | * this is possible hence simply stopping the | |
912 | * update. | |
913 | */ | |
914 | DBG3("UST app update failed to find app sock %d", | |
915 | app_sock); | |
916 | goto unlock_rcu; | |
421cb601 | 917 | } |
a9ad0c8f MD |
918 | ust_app_global_update(sess->ust_session, app); |
919 | unlock_rcu: | |
920 | rcu_read_unlock(); | |
921 | unlock_session: | |
4ee14516 | 922 | session_unlock(sess); |
487cf67c DG |
923 | } |
924 | } | |
925 | ||
7a485870 | 926 | /* |
d063d709 | 927 | * This thread manage event coming from the kernel. |
7a485870 | 928 | * |
d063d709 DG |
929 | * Features supported in this thread: |
930 | * -) CPU Hotplug | |
7a485870 DG |
931 | */ |
932 | static void *thread_manage_kernel(void *data) | |
933 | { | |
139ac872 | 934 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 935 | uint32_t revents, nb_fd; |
7a485870 | 936 | char tmp; |
5eb91c98 | 937 | struct lttng_poll_event events; |
7a485870 | 938 | |
6993eeb3 | 939 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 940 | |
6c71277b | 941 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 942 | |
d5d63bf1 DG |
943 | /* |
944 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 945 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 946 | */ |
6d737ce4 | 947 | lttng_poll_init(&events); |
d5d63bf1 | 948 | |
e547b070 | 949 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
950 | goto error_testpoint; |
951 | } | |
8ac94142 | 952 | |
840cb59c | 953 | health_code_update(); |
44a5e5eb | 954 | |
e547b070 | 955 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 956 | goto error_testpoint; |
6993eeb3 CB |
957 | } |
958 | ||
7a485870 | 959 | while (1) { |
840cb59c | 960 | health_code_update(); |
44a5e5eb | 961 | |
7a485870 | 962 | if (update_poll_flag == 1) { |
d21b0d71 DG |
963 | /* Clean events object. We are about to populate it again. */ |
964 | lttng_poll_clean(&events); | |
965 | ||
d0b96690 | 966 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
967 | if (ret < 0) { |
968 | goto error_poll_create; | |
969 | } | |
970 | ||
971 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
972 | if (ret < 0) { | |
973 | goto error; | |
974 | } | |
5f822d0a | 975 | |
d21b0d71 | 976 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
977 | ret = update_kernel_poll(&events); |
978 | if (ret < 0) { | |
7a485870 DG |
979 | goto error; |
980 | } | |
981 | update_poll_flag = 0; | |
982 | } | |
983 | ||
7fa2082e | 984 | DBG("Thread kernel polling"); |
7a485870 DG |
985 | |
986 | /* Poll infinite value of time */ | |
88f2b785 | 987 | restart: |
a78af745 | 988 | health_poll_entry(); |
5eb91c98 | 989 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
990 | DBG("Thread kernel return from poll on %d fds", |
991 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 992 | health_poll_exit(); |
7a485870 | 993 | if (ret < 0) { |
88f2b785 MD |
994 | /* |
995 | * Restart interrupted system call. | |
996 | */ | |
997 | if (errno == EINTR) { | |
998 | goto restart; | |
999 | } | |
7a485870 DG |
1000 | goto error; |
1001 | } else if (ret == 0) { | |
1002 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
1003 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
1004 | "This should not have happened! Continuing..."); | |
7a485870 DG |
1005 | continue; |
1006 | } | |
1007 | ||
0d9c5d77 DG |
1008 | nb_fd = ret; |
1009 | ||
5eb91c98 DG |
1010 | for (i = 0; i < nb_fd; i++) { |
1011 | /* Fetch once the poll data */ | |
1012 | revents = LTTNG_POLL_GETEV(&events, i); | |
1013 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 1014 | |
840cb59c | 1015 | health_code_update(); |
44a5e5eb | 1016 | |
fd20dac9 MD |
1017 | if (!revents) { |
1018 | /* No activity for this FD (poll implementation). */ | |
1019 | continue; | |
1020 | } | |
1021 | ||
5eb91c98 | 1022 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1023 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1024 | if (ret) { |
139ac872 MD |
1025 | err = 0; |
1026 | goto exit; | |
5eb91c98 | 1027 | } |
7a485870 | 1028 | |
5eb91c98 | 1029 | /* Check for data on kernel pipe */ |
03e43155 MD |
1030 | if (revents & LPOLLIN) { |
1031 | if (pollfd == kernel_poll_pipe[0]) { | |
1032 | (void) lttng_read(kernel_poll_pipe[0], | |
1033 | &tmp, 1); | |
1034 | /* | |
1035 | * Ret value is useless here, if this pipe gets any actions an | |
1036 | * update is required anyway. | |
1037 | */ | |
1038 | update_poll_flag = 1; | |
1039 | continue; | |
1040 | } else { | |
1041 | /* | |
1042 | * New CPU detected by the kernel. Adding kernel stream to | |
1043 | * kernel session and updating the kernel consumer | |
1044 | */ | |
2bdd86d4 | 1045 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
1046 | if (ret < 0) { |
1047 | continue; | |
1048 | } | |
1049 | break; | |
7a485870 | 1050 | } |
03e43155 MD |
1051 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1052 | update_poll_flag = 1; | |
1053 | continue; | |
1054 | } else { | |
1055 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1056 | goto error; | |
7a485870 DG |
1057 | } |
1058 | } | |
1059 | } | |
1060 | ||
139ac872 | 1061 | exit: |
7a485870 | 1062 | error: |
5eb91c98 | 1063 | lttng_poll_clean(&events); |
76d7553f | 1064 | error_poll_create: |
6993eeb3 | 1065 | error_testpoint: |
6620da75 DG |
1066 | utils_close_pipe(kernel_poll_pipe); |
1067 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 1068 | if (err) { |
840cb59c | 1069 | health_error(); |
139ac872 | 1070 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
1071 | WARN("Kernel thread died unexpectedly. " |
1072 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 1073 | } |
8782cc74 | 1074 | health_unregister(health_sessiond); |
76d7553f | 1075 | DBG("Kernel thread dying"); |
7a485870 DG |
1076 | return NULL; |
1077 | } | |
1078 | ||
a23ec3a7 DG |
1079 | /* |
1080 | * Signal pthread condition of the consumer data that the thread. | |
1081 | */ | |
1082 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
1083 | { | |
1084 | pthread_mutex_lock(&data->cond_mutex); | |
1085 | ||
1086 | /* | |
1087 | * The state is set before signaling. It can be any value, it's the waiter | |
1088 | * job to correctly interpret this condition variable associated to the | |
1089 | * consumer pthread_cond. | |
1090 | * | |
1091 | * A value of 0 means that the corresponding thread of the consumer data | |
1092 | * was not started. 1 indicates that the thread has started and is ready | |
1093 | * for action. A negative value means that there was an error during the | |
1094 | * thread bootstrap. | |
1095 | */ | |
1096 | data->consumer_thread_is_ready = state; | |
1097 | (void) pthread_cond_signal(&data->cond); | |
1098 | ||
1099 | pthread_mutex_unlock(&data->cond_mutex); | |
1100 | } | |
1101 | ||
1d4b027a | 1102 | /* |
3bd1e081 | 1103 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 1104 | */ |
3bd1e081 | 1105 | static void *thread_manage_consumer(void *data) |
1d4b027a | 1106 | { |
42fc1d0b | 1107 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
5eb91c98 | 1108 | uint32_t revents, nb_fd; |
1d4b027a | 1109 | enum lttcomm_return_code code; |
5eb91c98 | 1110 | struct lttng_poll_event events; |
3bd1e081 | 1111 | struct consumer_data *consumer_data = data; |
b3530820 | 1112 | struct consumer_socket *cmd_socket_wrapper = NULL; |
1d4b027a | 1113 | |
3bd1e081 | 1114 | DBG("[thread] Manage consumer started"); |
1d4b027a | 1115 | |
34c1e15a MD |
1116 | rcu_register_thread(); |
1117 | rcu_thread_online(); | |
1118 | ||
6c71277b | 1119 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 1120 | |
855060f8 | 1121 | health_code_update(); |
9449cc75 | 1122 | |
5eb91c98 | 1123 | /* |
331744e3 JD |
1124 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
1125 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 1126 | */ |
331744e3 | 1127 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 1128 | if (ret < 0) { |
76d7553f | 1129 | goto error_poll; |
5eb91c98 | 1130 | } |
273ea72c | 1131 | |
edb8b045 DG |
1132 | /* |
1133 | * The error socket here is already in a listening state which was done | |
1134 | * just before spawning this thread to avoid a race between the consumer | |
1135 | * daemon exec trying to connect and the listen() call. | |
1136 | */ | |
3bd1e081 | 1137 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
1138 | if (ret < 0) { |
1139 | goto error; | |
1140 | } | |
1141 | ||
840cb59c | 1142 | health_code_update(); |
44a5e5eb | 1143 | |
331744e3 | 1144 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1145 | restart: |
a78af745 | 1146 | health_poll_entry(); |
8ac94142 | 1147 | |
e547b070 | 1148 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1149 | goto error; |
1150 | } | |
8ac94142 | 1151 | |
5eb91c98 | 1152 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1153 | health_poll_exit(); |
273ea72c | 1154 | if (ret < 0) { |
88f2b785 MD |
1155 | /* |
1156 | * Restart interrupted system call. | |
1157 | */ | |
1158 | if (errno == EINTR) { | |
1159 | goto restart; | |
1160 | } | |
273ea72c DG |
1161 | goto error; |
1162 | } | |
1163 | ||
0d9c5d77 DG |
1164 | nb_fd = ret; |
1165 | ||
5eb91c98 DG |
1166 | for (i = 0; i < nb_fd; i++) { |
1167 | /* Fetch once the poll data */ | |
1168 | revents = LTTNG_POLL_GETEV(&events, i); | |
1169 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1170 | ||
840cb59c | 1171 | health_code_update(); |
44a5e5eb | 1172 | |
fd20dac9 MD |
1173 | if (!revents) { |
1174 | /* No activity for this FD (poll implementation). */ | |
1175 | continue; | |
1176 | } | |
1177 | ||
5eb91c98 | 1178 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1179 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1180 | if (ret) { |
139ac872 MD |
1181 | err = 0; |
1182 | goto exit; | |
5eb91c98 DG |
1183 | } |
1184 | ||
1185 | /* Event on the registration socket */ | |
3bd1e081 | 1186 | if (pollfd == consumer_data->err_sock) { |
03e43155 MD |
1187 | if (revents & LPOLLIN) { |
1188 | continue; | |
1189 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1190 | ERR("consumer err socket poll error"); |
5eb91c98 | 1191 | goto error; |
03e43155 MD |
1192 | } else { |
1193 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1194 | goto error; | |
5eb91c98 DG |
1195 | } |
1196 | } | |
273ea72c DG |
1197 | } |
1198 | ||
3bd1e081 | 1199 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1200 | if (sock < 0) { |
1201 | goto error; | |
1202 | } | |
1203 | ||
b662582b DG |
1204 | /* |
1205 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1206 | * show must go on. | |
1207 | */ | |
1208 | (void) utils_set_fd_cloexec(sock); | |
1209 | ||
840cb59c | 1210 | health_code_update(); |
44a5e5eb | 1211 | |
3bd1e081 | 1212 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1213 | |
712ea556 | 1214 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1215 | ret = lttcomm_recv_unix_sock(sock, &code, |
1216 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1217 | if (ret <= 0) { |
1218 | goto error; | |
1219 | } | |
1220 | ||
840cb59c | 1221 | health_code_update(); |
b3530820 | 1222 | if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 | 1223 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1224 | lttcomm_get_readable_code(-code)); |
1225 | goto error; | |
1226 | } | |
1227 | ||
b3530820 JG |
1228 | /* Connect both command and metadata sockets. */ |
1229 | consumer_data->cmd_sock = | |
1230 | lttcomm_connect_unix_sock( | |
1231 | consumer_data->cmd_unix_sock_path); | |
1232 | consumer_data->metadata_fd = | |
1233 | lttcomm_connect_unix_sock( | |
1234 | consumer_data->cmd_unix_sock_path); | |
1235 | if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) { | |
1236 | PERROR("consumer connect cmd socket"); | |
1237 | /* On error, signal condition and quit. */ | |
1238 | signal_consumer_condition(consumer_data, -1); | |
1239 | goto error; | |
1240 | } | |
1241 | ||
1242 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; | |
1243 | ||
1244 | /* Create metadata socket lock. */ | |
1245 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1246 | if (consumer_data->metadata_sock.lock == NULL) { | |
1247 | PERROR("zmalloc pthread mutex"); | |
1248 | goto error; | |
1249 | } | |
1250 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1251 | ||
1252 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); | |
1253 | DBG("Consumer metadata socket ready (fd: %d)", | |
1254 | consumer_data->metadata_fd); | |
1255 | ||
1256 | /* | |
1257 | * Remove the consumerd error sock since we've established a connection. | |
1258 | */ | |
3bd1e081 | 1259 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1260 | if (ret < 0) { |
72079cae DG |
1261 | goto error; |
1262 | } | |
1263 | ||
331744e3 | 1264 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1265 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1266 | if (ret < 0) { | |
72079cae | 1267 | goto error; |
5eb91c98 DG |
1268 | } |
1269 | ||
331744e3 | 1270 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1271 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1272 | LPOLLIN | LPOLLRDHUP); |
1273 | if (ret < 0) { | |
1274 | goto error; | |
1275 | } | |
1276 | ||
840cb59c | 1277 | health_code_update(); |
44a5e5eb | 1278 | |
b3530820 JG |
1279 | /* |
1280 | * Transfer the write-end of the channel monitoring pipe to the | |
1281 | * by issuing a SET_CHANNEL_MONITOR_PIPE command. | |
1282 | */ | |
1283 | cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock); | |
1284 | if (!cmd_socket_wrapper) { | |
1285 | goto error; | |
1286 | } | |
e4049c75 | 1287 | cmd_socket_wrapper->lock = &consumer_data->lock; |
b3530820 JG |
1288 | |
1289 | ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper, | |
1290 | consumer_data->channel_monitor_pipe); | |
1291 | if (ret) { | |
1292 | goto error; | |
1293 | } | |
1294 | /* Discard the socket wrapper as it is no longer needed. */ | |
1295 | consumer_destroy_socket(cmd_socket_wrapper); | |
1296 | cmd_socket_wrapper = NULL; | |
1297 | ||
1298 | /* The thread is completely initialized, signal that it is ready. */ | |
1299 | signal_consumer_condition(consumer_data, 1); | |
1300 | ||
331744e3 | 1301 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1302 | restart_poll: |
331744e3 | 1303 | while (1) { |
42fc1d0b DG |
1304 | health_code_update(); |
1305 | ||
1306 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
1307 | if (should_quit) { | |
1308 | /* Not a health error. */ | |
1309 | err = 0; | |
1310 | goto exit; | |
1311 | } | |
1312 | ||
331744e3 JD |
1313 | health_poll_entry(); |
1314 | ret = lttng_poll_wait(&events, -1); | |
1315 | health_poll_exit(); | |
1316 | if (ret < 0) { | |
1317 | /* | |
1318 | * Restart interrupted system call. | |
1319 | */ | |
1320 | if (errno == EINTR) { | |
1321 | goto restart_poll; | |
1322 | } | |
1323 | goto error; | |
88f2b785 | 1324 | } |
72079cae | 1325 | |
331744e3 | 1326 | nb_fd = ret; |
0d9c5d77 | 1327 | |
331744e3 JD |
1328 | for (i = 0; i < nb_fd; i++) { |
1329 | /* Fetch once the poll data */ | |
1330 | revents = LTTNG_POLL_GETEV(&events, i); | |
1331 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1332 | |
331744e3 | 1333 | health_code_update(); |
44a5e5eb | 1334 | |
fd20dac9 MD |
1335 | if (!revents) { |
1336 | /* No activity for this FD (poll implementation). */ | |
1337 | continue; | |
1338 | } | |
1339 | ||
42fc1d0b DG |
1340 | /* |
1341 | * Thread quit pipe has been triggered, flag that we should stop | |
1342 | * but continue the current loop to handle potential data from | |
1343 | * consumer. | |
1344 | */ | |
1345 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); | |
5eb91c98 | 1346 | |
331744e3 JD |
1347 | if (pollfd == sock) { |
1348 | /* Event on the consumerd socket */ | |
03e43155 MD |
1349 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1350 | && !(revents & LPOLLIN)) { | |
331744e3 JD |
1351 | ERR("consumer err socket second poll error"); |
1352 | goto error; | |
1353 | } | |
1354 | health_code_update(); | |
1355 | /* Wait for any kconsumerd error */ | |
1356 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1357 | sizeof(enum lttcomm_return_code)); | |
1358 | if (ret <= 0) { | |
1359 | ERR("consumer closed the command socket"); | |
1360 | goto error; | |
1361 | } | |
1362 | ||
1363 | ERR("consumer return code : %s", | |
1364 | lttcomm_get_readable_code(-code)); | |
1365 | ||
1366 | goto exit; | |
4ce514c4 | 1367 | } else if (pollfd == consumer_data->metadata_fd) { |
03e43155 MD |
1368 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1369 | && !(revents & LPOLLIN)) { | |
1370 | ERR("consumer err metadata socket second poll error"); | |
1371 | goto error; | |
1372 | } | |
331744e3 JD |
1373 | /* UST metadata requests */ |
1374 | ret = ust_consumer_metadata_request( | |
1375 | &consumer_data->metadata_sock); | |
1376 | if (ret < 0) { | |
1377 | ERR("Handling metadata request"); | |
1378 | goto error; | |
1379 | } | |
5eb91c98 | 1380 | } |
42fc1d0b | 1381 | /* No need for an else branch all FDs are tested prior. */ |
5eb91c98 | 1382 | } |
331744e3 | 1383 | health_code_update(); |
5eb91c98 DG |
1384 | } |
1385 | ||
139ac872 | 1386 | exit: |
1d4b027a | 1387 | error: |
fdadac08 DG |
1388 | /* |
1389 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1390 | * thread might be using them so get exclusive access which will abort all |
1391 | * other consumer command by other threads. | |
fdadac08 DG |
1392 | */ |
1393 | pthread_mutex_lock(&consumer_data->lock); | |
1394 | ||
5c827ce0 DG |
1395 | /* Immediately set the consumerd state to stopped */ |
1396 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1397 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1398 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1399 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1400 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1401 | } else { | |
1402 | /* Code flow error... */ | |
1403 | assert(0); | |
1404 | } | |
1405 | ||
76d7553f MD |
1406 | if (consumer_data->err_sock >= 0) { |
1407 | ret = close(consumer_data->err_sock); | |
1408 | if (ret) { | |
1409 | PERROR("close"); | |
1410 | } | |
a76cbd9f | 1411 | consumer_data->err_sock = -1; |
76d7553f MD |
1412 | } |
1413 | if (consumer_data->cmd_sock >= 0) { | |
1414 | ret = close(consumer_data->cmd_sock); | |
1415 | if (ret) { | |
1416 | PERROR("close"); | |
1417 | } | |
a76cbd9f | 1418 | consumer_data->cmd_sock = -1; |
76d7553f | 1419 | } |
96544455 SS |
1420 | if (consumer_data->metadata_sock.fd_ptr && |
1421 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1422 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1423 | if (ret) { |
1424 | PERROR("close"); | |
1425 | } | |
1426 | } | |
76d7553f MD |
1427 | if (sock >= 0) { |
1428 | ret = close(sock); | |
1429 | if (ret) { | |
1430 | PERROR("close"); | |
1431 | } | |
1432 | } | |
273ea72c | 1433 | |
3bd1e081 MD |
1434 | unlink(consumer_data->err_unix_sock_path); |
1435 | unlink(consumer_data->cmd_unix_sock_path); | |
fdadac08 | 1436 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1437 | |
fdadac08 | 1438 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1439 | if (consumer_data->metadata_sock.lock) { |
1440 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1441 | free(consumer_data->metadata_sock.lock); | |
1442 | } | |
5eb91c98 | 1443 | lttng_poll_clean(&events); |
b3530820 JG |
1444 | |
1445 | if (cmd_socket_wrapper) { | |
1446 | consumer_destroy_socket(cmd_socket_wrapper); | |
1447 | } | |
76d7553f | 1448 | error_poll: |
139ac872 | 1449 | if (err) { |
840cb59c | 1450 | health_error(); |
139ac872 MD |
1451 | ERR("Health error occurred in %s", __func__); |
1452 | } | |
8782cc74 | 1453 | health_unregister(health_sessiond); |
76d7553f | 1454 | DBG("consumer thread cleanup completed"); |
0177d773 | 1455 | |
34c1e15a MD |
1456 | rcu_thread_offline(); |
1457 | rcu_unregister_thread(); | |
1458 | ||
5eb91c98 | 1459 | return NULL; |
099e26bd DG |
1460 | } |
1461 | ||
099e26bd DG |
1462 | /* |
1463 | * This thread manage application communication. | |
1d4b027a DG |
1464 | */ |
1465 | static void *thread_manage_apps(void *data) | |
099e26bd | 1466 | { |
139ac872 | 1467 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1468 | ssize_t size_ret; |
5eb91c98 | 1469 | uint32_t revents, nb_fd; |
5eb91c98 | 1470 | struct lttng_poll_event events; |
099e26bd DG |
1471 | |
1472 | DBG("[thread] Manage application started"); | |
1473 | ||
f6a9efaa DG |
1474 | rcu_register_thread(); |
1475 | rcu_thread_online(); | |
1476 | ||
6c71277b | 1477 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1478 | |
e547b070 | 1479 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1480 | goto error_testpoint; |
1481 | } | |
1482 | ||
840cb59c | 1483 | health_code_update(); |
44a5e5eb | 1484 | |
d0b96690 | 1485 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1486 | if (ret < 0) { |
76d7553f | 1487 | goto error_poll_create; |
5eb91c98 | 1488 | } |
099e26bd | 1489 | |
5eb91c98 DG |
1490 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1491 | if (ret < 0) { | |
1492 | goto error; | |
1493 | } | |
099e26bd | 1494 | |
e547b070 | 1495 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1496 | goto error; |
1497 | } | |
8ac94142 | 1498 | |
840cb59c | 1499 | health_code_update(); |
44a5e5eb | 1500 | |
5eb91c98 | 1501 | while (1) { |
7fa2082e | 1502 | DBG("Apps thread polling"); |
099e26bd DG |
1503 | |
1504 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1505 | restart: |
a78af745 | 1506 | health_poll_entry(); |
5eb91c98 | 1507 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1508 | DBG("Apps thread return from poll on %d fds", |
1509 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1510 | health_poll_exit(); |
099e26bd | 1511 | if (ret < 0) { |
88f2b785 MD |
1512 | /* |
1513 | * Restart interrupted system call. | |
1514 | */ | |
1515 | if (errno == EINTR) { | |
1516 | goto restart; | |
1517 | } | |
099e26bd DG |
1518 | goto error; |
1519 | } | |
1520 | ||
0d9c5d77 DG |
1521 | nb_fd = ret; |
1522 | ||
5eb91c98 DG |
1523 | for (i = 0; i < nb_fd; i++) { |
1524 | /* Fetch once the poll data */ | |
1525 | revents = LTTNG_POLL_GETEV(&events, i); | |
1526 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1527 | ||
840cb59c | 1528 | health_code_update(); |
44a5e5eb | 1529 | |
fd20dac9 MD |
1530 | if (!revents) { |
1531 | /* No activity for this FD (poll implementation). */ | |
1532 | continue; | |
1533 | } | |
1534 | ||
5eb91c98 | 1535 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1536 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1537 | if (ret) { |
139ac872 MD |
1538 | err = 0; |
1539 | goto exit; | |
5eb91c98 | 1540 | } |
099e26bd | 1541 | |
5eb91c98 DG |
1542 | /* Inspect the apps cmd pipe */ |
1543 | if (pollfd == apps_cmd_pipe[0]) { | |
03e43155 | 1544 | if (revents & LPOLLIN) { |
d0b96690 DG |
1545 | int sock; |
1546 | ||
5eb91c98 | 1547 | /* Empty pipe */ |
6cd525e8 MD |
1548 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1549 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1550 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1551 | goto error; |
1552 | } | |
099e26bd | 1553 | |
840cb59c | 1554 | health_code_update(); |
44a5e5eb | 1555 | |
ffe60014 | 1556 | /* |
03e43155 MD |
1557 | * Since this is a command socket (write then read), |
1558 | * we only monitor the error events of the socket. | |
ffe60014 | 1559 | */ |
d0b96690 DG |
1560 | ret = lttng_poll_add(&events, sock, |
1561 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1562 | if (ret < 0) { | |
5eb91c98 | 1563 | goto error; |
e0c7ec2b | 1564 | } |
acc7b41b | 1565 | |
d0b96690 | 1566 | DBG("Apps with sock %d added to poll set", sock); |
03e43155 MD |
1567 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1568 | ERR("Apps command pipe error"); | |
1569 | goto error; | |
1570 | } else { | |
1571 | ERR("Unknown poll events %u for sock %d", revents, pollfd); | |
1572 | goto error; | |
0177d773 | 1573 | } |
5eb91c98 DG |
1574 | } else { |
1575 | /* | |
54d01ffb DG |
1576 | * At this point, we know that a registered application made |
1577 | * the event at poll_wait. | |
5eb91c98 DG |
1578 | */ |
1579 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1580 | /* Removing from the poll set */ | |
1581 | ret = lttng_poll_del(&events, pollfd); | |
1582 | if (ret < 0) { | |
1583 | goto error; | |
1584 | } | |
099e26bd | 1585 | |
b9d9b220 | 1586 | /* Socket closed on remote end. */ |
56fff090 | 1587 | ust_app_unregister(pollfd); |
03e43155 MD |
1588 | } else { |
1589 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1590 | goto error; | |
5eb91c98 | 1591 | } |
099e26bd | 1592 | } |
44a5e5eb | 1593 | |
840cb59c | 1594 | health_code_update(); |
099e26bd | 1595 | } |
099e26bd DG |
1596 | } |
1597 | ||
139ac872 | 1598 | exit: |
099e26bd | 1599 | error: |
5eb91c98 | 1600 | lttng_poll_clean(&events); |
76d7553f | 1601 | error_poll_create: |
6993eeb3 | 1602 | error_testpoint: |
6620da75 DG |
1603 | utils_close_pipe(apps_cmd_pipe); |
1604 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1605 | ||
1606 | /* | |
1607 | * We don't clean the UST app hash table here since already registered | |
1608 | * applications can still be controlled so let them be until the session | |
1609 | * daemon dies or the applications stop. | |
1610 | */ | |
1611 | ||
139ac872 | 1612 | if (err) { |
840cb59c | 1613 | health_error(); |
139ac872 MD |
1614 | ERR("Health error occurred in %s", __func__); |
1615 | } | |
8782cc74 | 1616 | health_unregister(health_sessiond); |
76d7553f | 1617 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1618 | rcu_thread_offline(); |
1619 | rcu_unregister_thread(); | |
099e26bd DG |
1620 | return NULL; |
1621 | } | |
1622 | ||
d0b96690 | 1623 | /* |
d88aee68 DG |
1624 | * Send a socket to a thread This is called from the dispatch UST registration |
1625 | * thread once all sockets are set for the application. | |
d0b96690 | 1626 | * |
b85dc84c DG |
1627 | * The sock value can be invalid, we don't really care, the thread will handle |
1628 | * it and make the necessary cleanup if so. | |
1629 | * | |
d0b96690 DG |
1630 | * On success, return 0 else a negative value being the errno message of the |
1631 | * write(). | |
1632 | */ | |
d88aee68 | 1633 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1634 | { |
6cd525e8 | 1635 | ssize_t ret; |
d0b96690 | 1636 | |
b85dc84c DG |
1637 | /* |
1638 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1639 | * before calling this function being a shutdown state of the thread. | |
1640 | */ | |
1641 | if (fd < 0) { | |
1642 | ret = -EBADF; | |
1643 | goto error; | |
1644 | } | |
d0b96690 | 1645 | |
6cd525e8 MD |
1646 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1647 | if (ret < sizeof(sock)) { | |
d88aee68 | 1648 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1649 | if (ret < 0) { |
1650 | ret = -errno; | |
1651 | } | |
1652 | goto error; | |
1653 | } | |
1654 | ||
1655 | /* All good. Don't send back the write positive ret value. */ | |
1656 | ret = 0; | |
1657 | error: | |
6cd525e8 | 1658 | return (int) ret; |
d0b96690 DG |
1659 | } |
1660 | ||
f45e313d DG |
1661 | /* |
1662 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1663 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1664 | * notify socket is never received. | |
1665 | */ | |
1666 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1667 | { | |
1668 | int ret, nb_fd = 0, i; | |
1669 | unsigned int fd_added = 0; | |
1670 | struct lttng_poll_event events; | |
1671 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1672 | ||
1673 | assert(wait_queue); | |
1674 | ||
1675 | lttng_poll_init(&events); | |
1676 | ||
1677 | /* Just skip everything for an empty queue. */ | |
1678 | if (!wait_queue->count) { | |
1679 | goto end; | |
1680 | } | |
1681 | ||
1682 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1683 | if (ret < 0) { | |
1684 | goto error_create; | |
1685 | } | |
1686 | ||
1687 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1688 | &wait_queue->head, head) { | |
1689 | assert(wait_node->app); | |
1690 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1691 | LPOLLHUP | LPOLLERR); | |
1692 | if (ret < 0) { | |
1693 | goto error; | |
1694 | } | |
1695 | ||
1696 | fd_added = 1; | |
1697 | } | |
1698 | ||
1699 | if (!fd_added) { | |
1700 | goto end; | |
1701 | } | |
1702 | ||
1703 | /* | |
1704 | * Poll but don't block so we can quickly identify the faulty events and | |
1705 | * clean them afterwards from the wait queue. | |
1706 | */ | |
1707 | ret = lttng_poll_wait(&events, 0); | |
1708 | if (ret < 0) { | |
1709 | goto error; | |
1710 | } | |
1711 | nb_fd = ret; | |
1712 | ||
1713 | for (i = 0; i < nb_fd; i++) { | |
1714 | /* Get faulty FD. */ | |
1715 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1716 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1717 | ||
fd20dac9 MD |
1718 | if (!revents) { |
1719 | /* No activity for this FD (poll implementation). */ | |
1720 | continue; | |
1721 | } | |
1722 | ||
f45e313d DG |
1723 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1724 | &wait_queue->head, head) { | |
1725 | if (pollfd == wait_node->app->sock && | |
1726 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1727 | cds_list_del(&wait_node->head); | |
1728 | wait_queue->count--; | |
1729 | ust_app_destroy(wait_node->app); | |
1730 | free(wait_node); | |
48b40bcf JG |
1731 | /* |
1732 | * Silence warning of use-after-free in | |
1733 | * cds_list_for_each_entry_safe which uses | |
1734 | * __typeof__(*wait_node). | |
1735 | */ | |
1736 | wait_node = NULL; | |
f45e313d | 1737 | break; |
03e43155 MD |
1738 | } else { |
1739 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1740 | goto error; | |
f45e313d DG |
1741 | } |
1742 | } | |
1743 | } | |
1744 | ||
1745 | if (nb_fd > 0) { | |
1746 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1747 | } | |
1748 | ||
1749 | end: | |
1750 | lttng_poll_clean(&events); | |
1751 | return; | |
1752 | ||
1753 | error: | |
1754 | lttng_poll_clean(&events); | |
1755 | error_create: | |
1756 | ERR("Unable to sanitize wait queue"); | |
1757 | return; | |
1758 | } | |
1759 | ||
099e26bd DG |
1760 | /* |
1761 | * Dispatch request from the registration threads to the application | |
1762 | * communication thread. | |
1763 | */ | |
1764 | static void *thread_dispatch_ust_registration(void *data) | |
1765 | { | |
12e2b881 | 1766 | int ret, err = -1; |
8bdee6e2 | 1767 | struct cds_wfcq_node *node; |
099e26bd | 1768 | struct ust_command *ust_cmd = NULL; |
f45e313d DG |
1769 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1770 | struct ust_reg_wait_queue wait_queue = { | |
1771 | .count = 0, | |
1772 | }; | |
d0b96690 | 1773 | |
967e3668 MD |
1774 | rcu_register_thread(); |
1775 | ||
6c71277b | 1776 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1777 | |
9ad42ec1 MD |
1778 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1779 | goto error_testpoint; | |
1780 | } | |
1781 | ||
12e2b881 MD |
1782 | health_code_update(); |
1783 | ||
f45e313d | 1784 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1785 | |
1786 | DBG("[thread] Dispatch UST command started"); | |
1787 | ||
5f7d3a72 | 1788 | for (;;) { |
12e2b881 MD |
1789 | health_code_update(); |
1790 | ||
099e26bd DG |
1791 | /* Atomically prepare the queue futex */ |
1792 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1793 | ||
5f7d3a72 MD |
1794 | if (CMM_LOAD_SHARED(dispatch_thread_exit)) { |
1795 | break; | |
1796 | } | |
1797 | ||
099e26bd | 1798 | do { |
d0b96690 | 1799 | struct ust_app *app = NULL; |
7972aab2 | 1800 | ust_cmd = NULL; |
d0b96690 | 1801 | |
f45e313d DG |
1802 | /* |
1803 | * Make sure we don't have node(s) that have hung up before receiving | |
1804 | * the notify socket. This is to clean the list in order to avoid | |
1805 | * memory leaks from notify socket that are never seen. | |
1806 | */ | |
1807 | sanitize_wait_queue(&wait_queue); | |
1808 | ||
12e2b881 | 1809 | health_code_update(); |
099e26bd | 1810 | /* Dequeue command for registration */ |
8bdee6e2 | 1811 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 1812 | if (node == NULL) { |
00a17c97 | 1813 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1814 | /* Continue thread execution */ |
1815 | break; | |
1816 | } | |
1817 | ||
1818 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1819 | ||
2f50c8a3 DG |
1820 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1821 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1822 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1823 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1824 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1825 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1826 | |
1827 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1828 | wait_node = zmalloc(sizeof(*wait_node)); | |
1829 | if (!wait_node) { | |
1830 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1831 | ret = close(ust_cmd->sock); |
1832 | if (ret < 0) { | |
1833 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1834 | } | |
51dec90d | 1835 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1836 | free(ust_cmd); |
d0b96690 DG |
1837 | goto error; |
1838 | } | |
1839 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1840 | ||
1841 | /* Create application object if socket is CMD. */ | |
1842 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1843 | ust_cmd->sock); | |
1844 | if (!wait_node->app) { | |
1845 | ret = close(ust_cmd->sock); | |
1846 | if (ret < 0) { | |
1847 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1848 | } |
51dec90d | 1849 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1850 | free(wait_node); |
7972aab2 | 1851 | free(ust_cmd); |
d0b96690 DG |
1852 | continue; |
1853 | } | |
1854 | /* | |
1855 | * Add application to the wait queue so we can set the notify | |
1856 | * socket before putting this object in the global ht. | |
1857 | */ | |
f45e313d DG |
1858 | cds_list_add(&wait_node->head, &wait_queue.head); |
1859 | wait_queue.count++; | |
d0b96690 | 1860 | |
7972aab2 | 1861 | free(ust_cmd); |
d0b96690 DG |
1862 | /* |
1863 | * We have to continue here since we don't have the notify | |
1864 | * socket and the application MUST be added to the hash table | |
1865 | * only at that moment. | |
1866 | */ | |
1867 | continue; | |
1868 | } else { | |
1869 | /* | |
1870 | * Look for the application in the local wait queue and set the | |
1871 | * notify socket if found. | |
1872 | */ | |
d88aee68 | 1873 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1874 | &wait_queue.head, head) { |
12e2b881 | 1875 | health_code_update(); |
d0b96690 DG |
1876 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1877 | wait_node->app->notify_sock = ust_cmd->sock; | |
1878 | cds_list_del(&wait_node->head); | |
f45e313d | 1879 | wait_queue.count--; |
d0b96690 DG |
1880 | app = wait_node->app; |
1881 | free(wait_node); | |
1882 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1883 | break; | |
1884 | } | |
1885 | } | |
020d7f60 DG |
1886 | |
1887 | /* | |
1888 | * With no application at this stage the received socket is | |
1889 | * basically useless so close it before we free the cmd data | |
1890 | * structure for good. | |
1891 | */ | |
1892 | if (!app) { | |
1893 | ret = close(ust_cmd->sock); | |
1894 | if (ret < 0) { | |
1895 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1896 | } | |
51dec90d | 1897 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1898 | } |
7972aab2 | 1899 | free(ust_cmd); |
d0b96690 DG |
1900 | } |
1901 | ||
1902 | if (app) { | |
d0b96690 DG |
1903 | /* |
1904 | * @session_lock_list | |
1905 | * | |
1906 | * Lock the global session list so from the register up to the | |
1907 | * registration done message, no thread can see the application | |
1908 | * and change its state. | |
1909 | */ | |
1910 | session_lock_list(); | |
1911 | rcu_read_lock(); | |
d88aee68 | 1912 | |
d0b96690 DG |
1913 | /* |
1914 | * Add application to the global hash table. This needs to be | |
1915 | * done before the update to the UST registry can locate the | |
1916 | * application. | |
1917 | */ | |
1918 | ust_app_add(app); | |
d88aee68 DG |
1919 | |
1920 | /* Set app version. This call will print an error if needed. */ | |
1921 | (void) ust_app_version(app); | |
1922 | ||
1923 | /* Send notify socket through the notify pipe. */ | |
1924 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1925 | app->notify_sock); | |
1926 | if (ret < 0) { | |
1927 | rcu_read_unlock(); | |
1928 | session_unlock_list(); | |
b85dc84c DG |
1929 | /* |
1930 | * No notify thread, stop the UST tracing. However, this is | |
1931 | * not an internal error of the this thread thus setting | |
1932 | * the health error code to a normal exit. | |
1933 | */ | |
1934 | err = 0; | |
d88aee68 | 1935 | goto error; |
6620da75 | 1936 | } |
d88aee68 | 1937 | |
d0b96690 DG |
1938 | /* |
1939 | * Update newly registered application with the tracing | |
1940 | * registry info already enabled information. | |
1941 | */ | |
1942 | update_ust_app(app->sock); | |
d88aee68 DG |
1943 | |
1944 | /* | |
1945 | * Don't care about return value. Let the manage apps threads | |
1946 | * handle app unregistration upon socket close. | |
1947 | */ | |
fb45065e | 1948 | (void) ust_app_register_done(app); |
d88aee68 DG |
1949 | |
1950 | /* | |
1951 | * Even if the application socket has been closed, send the app | |
1952 | * to the thread and unregistration will take place at that | |
1953 | * place. | |
1954 | */ | |
1955 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1956 | if (ret < 0) { |
d88aee68 DG |
1957 | rcu_read_unlock(); |
1958 | session_unlock_list(); | |
b85dc84c DG |
1959 | /* |
1960 | * No apps. thread, stop the UST tracing. However, this is | |
1961 | * not an internal error of the this thread thus setting | |
1962 | * the health error code to a normal exit. | |
1963 | */ | |
1964 | err = 0; | |
d88aee68 | 1965 | goto error; |
d0b96690 | 1966 | } |
d88aee68 | 1967 | |
d0b96690 DG |
1968 | rcu_read_unlock(); |
1969 | session_unlock_list(); | |
099e26bd | 1970 | } |
099e26bd DG |
1971 | } while (node != NULL); |
1972 | ||
12e2b881 | 1973 | health_poll_entry(); |
099e26bd DG |
1974 | /* Futex wait on queue. Blocking call on futex() */ |
1975 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1976 | health_poll_exit(); |
099e26bd | 1977 | } |
12e2b881 MD |
1978 | /* Normal exit, no error */ |
1979 | err = 0; | |
099e26bd DG |
1980 | |
1981 | error: | |
d88aee68 DG |
1982 | /* Clean up wait queue. */ |
1983 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1984 | &wait_queue.head, head) { |
d88aee68 | 1985 | cds_list_del(&wait_node->head); |
f45e313d | 1986 | wait_queue.count--; |
d88aee68 DG |
1987 | free(wait_node); |
1988 | } | |
1989 | ||
772b8f4d MD |
1990 | /* Empty command queue. */ |
1991 | for (;;) { | |
1992 | /* Dequeue command for registration */ | |
1993 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); | |
1994 | if (node == NULL) { | |
1995 | break; | |
1996 | } | |
1997 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1998 | ret = close(ust_cmd->sock); | |
1999 | if (ret < 0) { | |
2000 | PERROR("close ust sock exit dispatch %d", ust_cmd->sock); | |
2001 | } | |
2002 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2003 | free(ust_cmd); | |
2004 | } | |
2005 | ||
9ad42ec1 | 2006 | error_testpoint: |
099e26bd | 2007 | DBG("Dispatch thread dying"); |
12e2b881 MD |
2008 | if (err) { |
2009 | health_error(); | |
2010 | ERR("Health error occurred in %s", __func__); | |
2011 | } | |
8782cc74 | 2012 | health_unregister(health_sessiond); |
967e3668 | 2013 | rcu_unregister_thread(); |
099e26bd DG |
2014 | return NULL; |
2015 | } | |
2016 | ||
2017 | /* | |
2018 | * This thread manage application registration. | |
2019 | */ | |
2020 | static void *thread_registration_apps(void *data) | |
1d4b027a | 2021 | { |
139ac872 | 2022 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
2023 | uint32_t revents, nb_fd; |
2024 | struct lttng_poll_event events; | |
099e26bd DG |
2025 | /* |
2026 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
2027 | * freed in the manage apps thread. | |
2028 | */ | |
2029 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 2030 | |
099e26bd | 2031 | DBG("[thread] Manage application registration started"); |
1d4b027a | 2032 | |
6c71277b | 2033 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 2034 | |
e547b070 | 2035 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
2036 | goto error_testpoint; |
2037 | } | |
8ac94142 | 2038 | |
1d4b027a DG |
2039 | ret = lttcomm_listen_unix_sock(apps_sock); |
2040 | if (ret < 0) { | |
76d7553f | 2041 | goto error_listen; |
1d4b027a DG |
2042 | } |
2043 | ||
5eb91c98 DG |
2044 | /* |
2045 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
2046 | * more will be added to this poll set. | |
2047 | */ | |
d0b96690 | 2048 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 2049 | if (ret < 0) { |
76d7553f | 2050 | goto error_create_poll; |
5eb91c98 | 2051 | } |
273ea72c | 2052 | |
5eb91c98 DG |
2053 | /* Add the application registration socket */ |
2054 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
2055 | if (ret < 0) { | |
76d7553f | 2056 | goto error_poll_add; |
5eb91c98 | 2057 | } |
273ea72c | 2058 | |
1d4b027a | 2059 | /* Notify all applications to register */ |
0fdd1e2c DG |
2060 | ret = notify_ust_apps(1); |
2061 | if (ret < 0) { | |
2062 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
2063 | "Execution continues but there might be problem for already\n" |
2064 | "running applications that wishes to register."); | |
0fdd1e2c | 2065 | } |
1d4b027a DG |
2066 | |
2067 | while (1) { | |
2068 | DBG("Accepting application registration"); | |
273ea72c DG |
2069 | |
2070 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 2071 | restart: |
a78af745 | 2072 | health_poll_entry(); |
5eb91c98 | 2073 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 2074 | health_poll_exit(); |
273ea72c | 2075 | if (ret < 0) { |
88f2b785 MD |
2076 | /* |
2077 | * Restart interrupted system call. | |
2078 | */ | |
2079 | if (errno == EINTR) { | |
2080 | goto restart; | |
2081 | } | |
273ea72c DG |
2082 | goto error; |
2083 | } | |
2084 | ||
0d9c5d77 DG |
2085 | nb_fd = ret; |
2086 | ||
5eb91c98 | 2087 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 2088 | health_code_update(); |
139ac872 | 2089 | |
5eb91c98 DG |
2090 | /* Fetch once the poll data */ |
2091 | revents = LTTNG_POLL_GETEV(&events, i); | |
2092 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 2093 | |
fd20dac9 MD |
2094 | if (!revents) { |
2095 | /* No activity for this FD (poll implementation). */ | |
2096 | continue; | |
2097 | } | |
2098 | ||
5eb91c98 | 2099 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 2100 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 2101 | if (ret) { |
139ac872 MD |
2102 | err = 0; |
2103 | goto exit; | |
90014c57 | 2104 | } |
1d4b027a | 2105 | |
5eb91c98 DG |
2106 | /* Event on the registration socket */ |
2107 | if (pollfd == apps_sock) { | |
03e43155 | 2108 | if (revents & LPOLLIN) { |
5eb91c98 DG |
2109 | sock = lttcomm_accept_unix_sock(apps_sock); |
2110 | if (sock < 0) { | |
2111 | goto error; | |
2112 | } | |
099e26bd | 2113 | |
16c5c8fa DG |
2114 | /* |
2115 | * Set socket timeout for both receiving and ending. | |
2116 | * app_socket_timeout is in seconds, whereas | |
2117 | * lttcomm_setsockopt_rcv_timeout and | |
2118 | * lttcomm_setsockopt_snd_timeout expect msec as | |
2119 | * parameter. | |
2120 | */ | |
87c3f04b | 2121 | if (config.app_socket_timeout >= 0) { |
28ce0ff2 | 2122 | (void) lttcomm_setsockopt_rcv_timeout(sock, |
87c3f04b | 2123 | config.app_socket_timeout * 1000); |
28ce0ff2 | 2124 | (void) lttcomm_setsockopt_snd_timeout(sock, |
87c3f04b | 2125 | config.app_socket_timeout * 1000); |
28ce0ff2 | 2126 | } |
16c5c8fa | 2127 | |
b662582b DG |
2128 | /* |
2129 | * Set the CLOEXEC flag. Return code is useless because | |
2130 | * either way, the show must go on. | |
2131 | */ | |
2132 | (void) utils_set_fd_cloexec(sock); | |
2133 | ||
5eb91c98 | 2134 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 2135 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 2136 | if (ust_cmd == NULL) { |
76d7553f | 2137 | PERROR("ust command zmalloc"); |
41ed8e47 MD |
2138 | ret = close(sock); |
2139 | if (ret) { | |
2140 | PERROR("close"); | |
2141 | } | |
5eb91c98 DG |
2142 | goto error; |
2143 | } | |
1d4b027a | 2144 | |
5eb91c98 DG |
2145 | /* |
2146 | * Using message-based transmissions to ensure we don't | |
2147 | * have to deal with partially received messages. | |
2148 | */ | |
4063050c MD |
2149 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
2150 | if (ret < 0) { | |
2151 | ERR("Exhausted file descriptors allowed for applications."); | |
2152 | free(ust_cmd); | |
2153 | ret = close(sock); | |
2154 | if (ret) { | |
2155 | PERROR("close"); | |
2156 | } | |
2157 | sock = -1; | |
2158 | continue; | |
2159 | } | |
d88aee68 | 2160 | |
840cb59c | 2161 | health_code_update(); |
d0b96690 DG |
2162 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
2163 | if (ret < 0) { | |
5eb91c98 | 2164 | free(ust_cmd); |
d0b96690 | 2165 | /* Close socket of the application. */ |
76d7553f MD |
2166 | ret = close(sock); |
2167 | if (ret) { | |
2168 | PERROR("close"); | |
2169 | } | |
4063050c | 2170 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 2171 | sock = -1; |
5eb91c98 DG |
2172 | continue; |
2173 | } | |
840cb59c | 2174 | health_code_update(); |
099e26bd | 2175 | |
5eb91c98 | 2176 | ust_cmd->sock = sock; |
34a2494f | 2177 | sock = -1; |
099e26bd | 2178 | |
5eb91c98 DG |
2179 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2180 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2181 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2182 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2183 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2184 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2185 | |
5eb91c98 DG |
2186 | /* |
2187 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2188 | * has been taken! This apps will be part of the *system*. |
5eb91c98 | 2189 | */ |
8bdee6e2 | 2190 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
5eb91c98 DG |
2191 | |
2192 | /* | |
2193 | * Wake the registration queue futex. Implicit memory | |
8bdee6e2 | 2194 | * barrier with the exchange in cds_wfcq_enqueue. |
5eb91c98 DG |
2195 | */ |
2196 | futex_nto1_wake(&ust_cmd_queue.futex); | |
03e43155 MD |
2197 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2198 | ERR("Register apps socket poll error"); | |
2199 | goto error; | |
2200 | } else { | |
2201 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2202 | goto error; | |
5eb91c98 DG |
2203 | } |
2204 | } | |
90014c57 | 2205 | } |
1d4b027a DG |
2206 | } |
2207 | ||
139ac872 | 2208 | exit: |
1d4b027a | 2209 | error: |
0fdd1e2c DG |
2210 | /* Notify that the registration thread is gone */ |
2211 | notify_ust_apps(0); | |
2212 | ||
a4b35e07 | 2213 | if (apps_sock >= 0) { |
76d7553f MD |
2214 | ret = close(apps_sock); |
2215 | if (ret) { | |
2216 | PERROR("close"); | |
2217 | } | |
a4b35e07 | 2218 | } |
46c3f085 | 2219 | if (sock >= 0) { |
76d7553f MD |
2220 | ret = close(sock); |
2221 | if (ret) { | |
2222 | PERROR("close"); | |
2223 | } | |
4063050c | 2224 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2225 | } |
87c3f04b | 2226 | unlink(config.apps_unix_sock_path.value); |
0fdd1e2c | 2227 | |
76d7553f | 2228 | error_poll_add: |
5eb91c98 | 2229 | lttng_poll_clean(&events); |
76d7553f MD |
2230 | error_listen: |
2231 | error_create_poll: | |
6993eeb3 | 2232 | error_testpoint: |
76d7553f | 2233 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2234 | if (err) { |
2235 | health_error(); | |
2236 | ERR("Health error occurred in %s", __func__); | |
2237 | } | |
8782cc74 | 2238 | health_unregister(health_sessiond); |
5eb91c98 | 2239 | |
1d4b027a DG |
2240 | return NULL; |
2241 | } | |
2242 | ||
8c0faa1d | 2243 | /* |
3bd1e081 | 2244 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2245 | * exec or it will fails. |
8c0faa1d | 2246 | */ |
3bd1e081 | 2247 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2248 | { |
a23ec3a7 | 2249 | int ret, clock_ret; |
ee0b0061 DG |
2250 | struct timespec timeout; |
2251 | ||
13a7bce3 JG |
2252 | /* |
2253 | * Make sure we set the readiness flag to 0 because we are NOT ready. | |
2254 | * This access to consumer_thread_is_ready does not need to be | |
2255 | * protected by consumer_data.cond_mutex (yet) since the consumer | |
2256 | * management thread has not been started at this point. | |
2257 | */ | |
a23ec3a7 | 2258 | consumer_data->consumer_thread_is_ready = 0; |
8c0faa1d | 2259 | |
a23ec3a7 DG |
2260 | /* Setup pthread condition */ |
2261 | ret = pthread_condattr_init(&consumer_data->condattr); | |
4a15001e | 2262 | if (ret) { |
a23ec3a7 DG |
2263 | errno = ret; |
2264 | PERROR("pthread_condattr_init consumer data"); | |
2265 | goto error; | |
2266 | } | |
2267 | ||
2268 | /* | |
2269 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2270 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2271 | * for a more details and how we noticed it. | |
2272 | */ | |
2273 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
4a15001e | 2274 | if (ret) { |
a23ec3a7 DG |
2275 | errno = ret; |
2276 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2277 | goto error; |
2278 | } | |
8c0faa1d | 2279 | |
a23ec3a7 | 2280 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
4a15001e | 2281 | if (ret) { |
a23ec3a7 DG |
2282 | errno = ret; |
2283 | PERROR("pthread_cond_init consumer data"); | |
2284 | goto error; | |
2285 | } | |
2286 | ||
1a1a34b4 MJ |
2287 | ret = pthread_create(&consumer_data->thread, default_pthread_attr(), |
2288 | thread_manage_consumer, consumer_data); | |
4a15001e MD |
2289 | if (ret) { |
2290 | errno = ret; | |
3bd1e081 | 2291 | PERROR("pthread_create consumer"); |
ee0b0061 | 2292 | ret = -1; |
8c0faa1d DG |
2293 | goto error; |
2294 | } | |
2295 | ||
a23ec3a7 DG |
2296 | /* We are about to wait on a pthread condition */ |
2297 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2298 | ||
ee0b0061 | 2299 | /* Get time for sem_timedwait absolute timeout */ |
389fbf04 | 2300 | clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout); |
a23ec3a7 DG |
2301 | /* |
2302 | * Set the timeout for the condition timed wait even if the clock gettime | |
2303 | * call fails since we might loop on that call and we want to avoid to | |
2304 | * increment the timeout too many times. | |
2305 | */ | |
2306 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2307 | ||
2308 | /* | |
2309 | * The following loop COULD be skipped in some conditions so this is why we | |
2310 | * set ret to 0 in order to make sure at least one round of the loop is | |
2311 | * done. | |
2312 | */ | |
2313 | ret = 0; | |
2314 | ||
2315 | /* | |
2316 | * Loop until the condition is reached or when a timeout is reached. Note | |
2317 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2318 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2319 | * possible. This loop does not take any chances and works with both of | |
2320 | * them. | |
2321 | */ | |
2322 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2323 | if (clock_ret < 0) { | |
2324 | PERROR("clock_gettime spawn consumer"); | |
2325 | /* Infinite wait for the consumerd thread to be ready */ | |
2326 | ret = pthread_cond_wait(&consumer_data->cond, | |
2327 | &consumer_data->cond_mutex); | |
2328 | } else { | |
2329 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2330 | &consumer_data->cond_mutex, &timeout); | |
2331 | } | |
ee0b0061 | 2332 | } |
8c0faa1d | 2333 | |
a23ec3a7 DG |
2334 | /* Release the pthread condition */ |
2335 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2336 | ||
2337 | if (ret != 0) { | |
2338 | errno = ret; | |
2339 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2340 | int pth_ret; |
2341 | ||
ee0b0061 DG |
2342 | /* |
2343 | * Call has timed out so we kill the kconsumerd_thread and return | |
2344 | * an error. | |
2345 | */ | |
a23ec3a7 DG |
2346 | ERR("Condition timed out. The consumer thread was never ready." |
2347 | " Killing it"); | |
4282f9a3 DG |
2348 | pth_ret = pthread_cancel(consumer_data->thread); |
2349 | if (pth_ret < 0) { | |
3bd1e081 | 2350 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2351 | } |
2352 | } else { | |
a23ec3a7 | 2353 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2354 | } |
4282f9a3 DG |
2355 | /* Caller is expecting a negative value on failure. */ |
2356 | ret = -1; | |
ee0b0061 DG |
2357 | goto error; |
2358 | } | |
2359 | ||
3bd1e081 MD |
2360 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2361 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2362 | ERR("Consumerd did not start"); |
3bd1e081 | 2363 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2364 | goto error; |
2365 | } | |
3bd1e081 | 2366 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2367 | |
8c0faa1d DG |
2368 | return 0; |
2369 | ||
2370 | error: | |
2371 | return ret; | |
2372 | } | |
2373 | ||
d9800920 | 2374 | /* |
3bd1e081 | 2375 | * Join consumer thread |
d9800920 | 2376 | */ |
3bd1e081 | 2377 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2378 | { |
2379 | void *status; | |
cf3af59e | 2380 | |
e8209f6b DG |
2381 | /* Consumer pid must be a real one. */ |
2382 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2383 | int ret; |
3bd1e081 | 2384 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2385 | if (ret) { |
4a15001e | 2386 | PERROR("Error killing consumer daemon"); |
cf3af59e MD |
2387 | return ret; |
2388 | } | |
3bd1e081 | 2389 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2390 | } else { |
2391 | return 0; | |
2392 | } | |
2393 | } | |
2394 | ||
8c0faa1d | 2395 | /* |
3bd1e081 | 2396 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2397 | * |
d063d709 | 2398 | * Return pid if successful else -1. |
8c0faa1d | 2399 | */ |
3bd1e081 | 2400 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2401 | { |
2402 | int ret; | |
2403 | pid_t pid; | |
94c55f17 | 2404 | const char *consumer_to_use; |
53086306 | 2405 | const char *verbosity; |
94c55f17 | 2406 | struct stat st; |
8c0faa1d | 2407 | |
3bd1e081 | 2408 | DBG("Spawning consumerd"); |
c49dc785 | 2409 | |
8c0faa1d DG |
2410 | pid = fork(); |
2411 | if (pid == 0) { | |
2412 | /* | |
3bd1e081 | 2413 | * Exec consumerd. |
8c0faa1d | 2414 | */ |
87c3f04b | 2415 | if (config.verbose_consumer) { |
53086306 | 2416 | verbosity = "--verbose"; |
4421f712 | 2417 | } else if (lttng_opt_quiet) { |
53086306 | 2418 | verbosity = "--quiet"; |
4421f712 DG |
2419 | } else { |
2420 | verbosity = ""; | |
53086306 | 2421 | } |
4421f712 | 2422 | |
3bd1e081 MD |
2423 | switch (consumer_data->type) { |
2424 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2425 | /* |
c7704d57 DG |
2426 | * Find out which consumerd to execute. We will first try the |
2427 | * 64-bit path, then the sessiond's installation directory, and | |
2428 | * fallback on the 32-bit one, | |
94c55f17 | 2429 | */ |
63a799e8 | 2430 | DBG3("Looking for a kernel consumer at these locations:"); |
79af6b77 | 2431 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); |
87c3f04b | 2432 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
79af6b77 | 2433 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); |
87c3f04b | 2434 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { |
63a799e8 | 2435 | DBG3("Found location #1"); |
87c3f04b JG |
2436 | consumer_to_use = config.consumerd64_bin_path.value; |
2437 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
63a799e8 | 2438 | DBG3("Found location #2"); |
87c3f04b | 2439 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; |
e8b552f9 JG |
2440 | } else if (config.consumerd32_bin_path.value && |
2441 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
63a799e8 | 2442 | DBG3("Found location #3"); |
87c3f04b | 2443 | consumer_to_use = config.consumerd32_bin_path.value; |
94c55f17 | 2444 | } else { |
63a799e8 | 2445 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2446 | ret = -EINVAL; |
a91b8bf4 | 2447 | goto error; |
94c55f17 AM |
2448 | } |
2449 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
eca422c7 | 2450 | (void) execl(consumer_to_use, |
94c55f17 AM |
2451 | "lttng-consumerd", verbosity, "-k", |
2452 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2453 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
87c3f04b | 2454 | "--group", config.tracing_group_name.value, |
94c55f17 | 2455 | NULL); |
3bd1e081 | 2456 | break; |
7753dea8 MD |
2457 | case LTTNG_CONSUMER64_UST: |
2458 | { | |
b1e0b6b6 | 2459 | char *tmpnew = NULL; |
8f4905da | 2460 | |
ed6c7ac8 | 2461 | if (config.consumerd64_lib_dir.value) { |
8f4905da MD |
2462 | char *tmp; |
2463 | size_t tmplen; | |
2464 | ||
e8fa9fb0 | 2465 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2466 | if (!tmp) { |
2467 | tmp = ""; | |
2468 | } | |
710509e6 | 2469 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2470 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2471 | if (!tmpnew) { | |
2472 | ret = -ENOMEM; | |
2473 | goto error; | |
2474 | } | |
87c3f04b | 2475 | strcat(tmpnew, config.consumerd64_lib_dir.value); |
8f4905da MD |
2476 | if (tmp[0] != '\0') { |
2477 | strcat(tmpnew, ":"); | |
2478 | strcat(tmpnew, tmp); | |
2479 | } | |
710509e6 | 2480 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
8f4905da MD |
2481 | if (ret) { |
2482 | ret = -errno; | |
c6f76da9 | 2483 | free(tmpnew); |
8f4905da MD |
2484 | goto error; |
2485 | } | |
2486 | } | |
87c3f04b JG |
2487 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); |
2488 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2489 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2490 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
87c3f04b | 2491 | "--group", config.tracing_group_name.value, |
7753dea8 | 2492 | NULL); |
ed6c7ac8 | 2493 | free(tmpnew); |
3bd1e081 | 2494 | break; |
7753dea8 MD |
2495 | } |
2496 | case LTTNG_CONSUMER32_UST: | |
2497 | { | |
937dde8e | 2498 | char *tmpnew = NULL; |
8f4905da | 2499 | |
ed6c7ac8 | 2500 | if (config.consumerd32_lib_dir.value) { |
8f4905da MD |
2501 | char *tmp; |
2502 | size_t tmplen; | |
2503 | ||
e8fa9fb0 | 2504 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2505 | if (!tmp) { |
2506 | tmp = ""; | |
2507 | } | |
710509e6 | 2508 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2509 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2510 | if (!tmpnew) { | |
2511 | ret = -ENOMEM; | |
2512 | goto error; | |
2513 | } | |
87c3f04b | 2514 | strcat(tmpnew, config.consumerd32_lib_dir.value); |
8f4905da MD |
2515 | if (tmp[0] != '\0') { |
2516 | strcat(tmpnew, ":"); | |
2517 | strcat(tmpnew, tmp); | |
2518 | } | |
710509e6 | 2519 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
8f4905da MD |
2520 | if (ret) { |
2521 | ret = -errno; | |
c6f76da9 | 2522 | free(tmpnew); |
8f4905da MD |
2523 | goto error; |
2524 | } | |
2525 | } | |
87c3f04b JG |
2526 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); |
2527 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2528 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2529 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
87c3f04b | 2530 | "--group", config.tracing_group_name.value, |
7753dea8 | 2531 | NULL); |
ed6c7ac8 | 2532 | free(tmpnew); |
7753dea8 MD |
2533 | break; |
2534 | } | |
3bd1e081 | 2535 | default: |
3c515f4d | 2536 | ERR("unknown consumer type"); |
3bd1e081 MD |
2537 | exit(EXIT_FAILURE); |
2538 | } | |
8c0faa1d | 2539 | if (errno != 0) { |
4282f9a3 | 2540 | PERROR("Consumer execl()"); |
8c0faa1d | 2541 | } |
4282f9a3 | 2542 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2543 | exit(EXIT_FAILURE); |
2544 | } else if (pid > 0) { | |
2545 | ret = pid; | |
8c0faa1d | 2546 | } else { |
76d7553f | 2547 | PERROR("start consumer fork"); |
8c0faa1d | 2548 | ret = -errno; |
8c0faa1d | 2549 | } |
8f4905da | 2550 | error: |
8c0faa1d DG |
2551 | return ret; |
2552 | } | |
2553 | ||
693bd40b | 2554 | /* |
3bd1e081 | 2555 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2556 | */ |
3bd1e081 | 2557 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2558 | { |
c617c0c6 | 2559 | int ret; |
edb8b045 DG |
2560 | |
2561 | /* | |
2562 | * Set the listen() state on the socket since there is a possible race | |
2563 | * between the exec() of the consumer daemon and this call if place in the | |
2564 | * consumer thread. See bug #366 for more details. | |
2565 | */ | |
2566 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2567 | if (ret < 0) { | |
2568 | goto error; | |
2569 | } | |
693bd40b | 2570 | |
3bd1e081 MD |
2571 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2572 | if (consumer_data->pid != 0) { | |
2573 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2574 | goto end; |
2575 | } | |
693bd40b | 2576 | |
3bd1e081 | 2577 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2578 | if (ret < 0) { |
3bd1e081 MD |
2579 | ERR("Spawning consumerd failed"); |
2580 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2581 | goto error; |
693bd40b | 2582 | } |
c49dc785 | 2583 | |
3bd1e081 MD |
2584 | /* Setting up the consumer_data pid */ |
2585 | consumer_data->pid = ret; | |
48842b30 | 2586 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2587 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2588 | |
3bd1e081 MD |
2589 | DBG2("Spawning consumer control thread"); |
2590 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2591 | if (ret < 0) { |
3bd1e081 | 2592 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2593 | goto error; |
2594 | } | |
2595 | ||
c49dc785 | 2596 | end: |
693bd40b DG |
2597 | return 0; |
2598 | ||
2599 | error: | |
331744e3 | 2600 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2601 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2602 | int err; |
2603 | ||
edb8b045 DG |
2604 | err = close(consumer_data->err_sock); |
2605 | if (err < 0) { | |
2606 | PERROR("close consumer data error socket"); | |
2607 | } | |
2608 | } | |
693bd40b DG |
2609 | return ret; |
2610 | } | |
2611 | ||
b73401da | 2612 | /* |
096102bd | 2613 | * Setup necessary data for kernel tracer action. |
b73401da | 2614 | */ |
096102bd | 2615 | static int init_kernel_tracer(void) |
b73401da DG |
2616 | { |
2617 | int ret; | |
b73401da | 2618 | |
096102bd DG |
2619 | /* Modprobe lttng kernel modules */ |
2620 | ret = modprobe_lttng_control(); | |
b73401da | 2621 | if (ret < 0) { |
b73401da DG |
2622 | goto error; |
2623 | } | |
2624 | ||
096102bd DG |
2625 | /* Open debugfs lttng */ |
2626 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2627 | if (kernel_tracer_fd < 0) { | |
2628 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b | 2629 | goto error_open; |
54d01ffb DG |
2630 | } |
2631 | ||
2f77fc4b DG |
2632 | /* Validate kernel version */ |
2633 | ret = kernel_validate_version(kernel_tracer_fd); | |
2634 | if (ret < 0) { | |
2635 | goto error_version; | |
b551a063 | 2636 | } |
54d01ffb | 2637 | |
2f77fc4b DG |
2638 | ret = modprobe_lttng_data(); |
2639 | if (ret < 0) { | |
2640 | goto error_modules; | |
54d01ffb DG |
2641 | } |
2642 | ||
883d8478 JR |
2643 | ret = kernel_supports_ring_buffer_snapshot_sample_positions( |
2644 | kernel_tracer_fd); | |
2645 | if (ret < 0) { | |
2646 | goto error_modules; | |
2647 | } | |
2648 | ||
2649 | if (ret < 1) { | |
2650 | WARN("Kernel tracer does not support buffer monitoring. " | |
2651 | "The monitoring timer of channels in the kernel domain " | |
2652 | "will be set to 0 (disabled)."); | |
2653 | } | |
2654 | ||
2f77fc4b DG |
2655 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2656 | return 0; | |
2657 | ||
2658 | error_version: | |
2659 | modprobe_remove_lttng_control(); | |
2660 | ret = close(kernel_tracer_fd); | |
2661 | if (ret) { | |
2662 | PERROR("close"); | |
b551a063 | 2663 | } |
2f77fc4b | 2664 | kernel_tracer_fd = -1; |
f73fabfd | 2665 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2666 | |
2f77fc4b DG |
2667 | error_modules: |
2668 | ret = close(kernel_tracer_fd); | |
2669 | if (ret) { | |
2670 | PERROR("close"); | |
b551a063 | 2671 | } |
54d01ffb | 2672 | |
2f77fc4b DG |
2673 | error_open: |
2674 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2675 | |
2676 | error: | |
2f77fc4b DG |
2677 | WARN("No kernel tracer available"); |
2678 | kernel_tracer_fd = -1; | |
2679 | if (!is_root) { | |
f73fabfd | 2680 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2681 | } else { |
f73fabfd | 2682 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2683 | } |
54d01ffb DG |
2684 | } |
2685 | ||
2f77fc4b | 2686 | |
54d01ffb | 2687 | /* |
2f77fc4b DG |
2688 | * Copy consumer output from the tracing session to the domain session. The |
2689 | * function also applies the right modification on a per domain basis for the | |
2690 | * trace files destination directory. | |
36b588ed MD |
2691 | * |
2692 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2693 | */ |
2f77fc4b | 2694 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2695 | { |
2696 | int ret; | |
2f77fc4b DG |
2697 | const char *dir_name; |
2698 | struct consumer_output *consumer; | |
2699 | ||
2700 | assert(session); | |
2701 | assert(session->consumer); | |
54d01ffb | 2702 | |
b551a063 DG |
2703 | switch (domain) { |
2704 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2705 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2706 | /* |
2707 | * XXX: We should audit the session creation and what this function | |
2708 | * does "extra" in order to avoid a destroy since this function is used | |
2709 | * in the domain session creation (kernel and ust) only. Same for UST | |
2710 | * domain. | |
2711 | */ | |
2712 | if (session->kernel_session->consumer) { | |
6addfa37 | 2713 | consumer_output_put(session->kernel_session->consumer); |
09a90bcd | 2714 | } |
2f77fc4b DG |
2715 | session->kernel_session->consumer = |
2716 | consumer_copy_output(session->consumer); | |
2717 | /* Ease our life a bit for the next part */ | |
2718 | consumer = session->kernel_session->consumer; | |
2719 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2720 | break; |
f20baf8e | 2721 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2722 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2723 | case LTTNG_DOMAIN_PYTHON: |
b551a063 | 2724 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2725 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd | 2726 | if (session->ust_session->consumer) { |
6addfa37 | 2727 | consumer_output_put(session->ust_session->consumer); |
09a90bcd | 2728 | } |
2f77fc4b DG |
2729 | session->ust_session->consumer = |
2730 | consumer_copy_output(session->consumer); | |
2731 | /* Ease our life a bit for the next part */ | |
2732 | consumer = session->ust_session->consumer; | |
2733 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2734 | break; |
2735 | default: | |
f73fabfd | 2736 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2737 | goto error; |
2738 | } | |
2739 | ||
2f77fc4b | 2740 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2741 | strncat(consumer->subdir, dir_name, |
2742 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2743 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2744 | ||
f73fabfd | 2745 | ret = LTTNG_OK; |
54d01ffb DG |
2746 | |
2747 | error: | |
2748 | return ret; | |
2749 | } | |
2750 | ||
00e2e675 | 2751 | /* |
2f77fc4b | 2752 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2753 | * |
2754 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2755 | */ |
2f77fc4b DG |
2756 | static int create_ust_session(struct ltt_session *session, |
2757 | struct lttng_domain *domain) | |
00e2e675 DG |
2758 | { |
2759 | int ret; | |
2f77fc4b | 2760 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2761 | |
a4b92340 | 2762 | assert(session); |
2f77fc4b DG |
2763 | assert(domain); |
2764 | assert(session->consumer); | |
a4b92340 | 2765 | |
2f77fc4b | 2766 | switch (domain->type) { |
f20baf8e | 2767 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2768 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2769 | case LTTNG_DOMAIN_PYTHON: |
2f77fc4b DG |
2770 | case LTTNG_DOMAIN_UST: |
2771 | break; | |
2772 | default: | |
2773 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2774 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2775 | goto error; |
2776 | } | |
2777 | ||
2f77fc4b DG |
2778 | DBG("Creating UST session"); |
2779 | ||
dec56f6c | 2780 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2781 | if (lus == NULL) { |
f73fabfd | 2782 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2783 | goto error; |
2784 | } | |
2785 | ||
2f77fc4b DG |
2786 | lus->uid = session->uid; |
2787 | lus->gid = session->gid; | |
2bba9e53 | 2788 | lus->output_traces = session->output_traces; |
27babd3a | 2789 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2790 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2791 | session->ust_session = lus; |
d7ba1388 | 2792 | if (session->shm_path[0]) { |
3d071855 MD |
2793 | strncpy(lus->root_shm_path, session->shm_path, |
2794 | sizeof(lus->root_shm_path)); | |
2795 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2796 | strncpy(lus->shm_path, session->shm_path, |
2797 | sizeof(lus->shm_path)); | |
2798 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
2799 | strncat(lus->shm_path, "/ust", | |
2800 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
2801 | } | |
2f77fc4b DG |
2802 | /* Copy session output to the newly created UST session */ |
2803 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2804 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2805 | goto error; |
2806 | } | |
2807 | ||
f73fabfd | 2808 | return LTTNG_OK; |
00e2e675 DG |
2809 | |
2810 | error: | |
2f77fc4b DG |
2811 | free(lus); |
2812 | session->ust_session = NULL; | |
00e2e675 DG |
2813 | return ret; |
2814 | } | |
2815 | ||
2816 | /* | |
2f77fc4b | 2817 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2818 | */ |
2f77fc4b | 2819 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2820 | { |
2821 | int ret; | |
a4b92340 | 2822 | |
2f77fc4b | 2823 | DBG("Creating kernel session"); |
00e2e675 | 2824 | |
2f77fc4b DG |
2825 | ret = kernel_create_session(session, kernel_tracer_fd); |
2826 | if (ret < 0) { | |
f73fabfd | 2827 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2828 | goto error; |
2829 | } | |
2830 | ||
2f77fc4b DG |
2831 | /* Code flow safety */ |
2832 | assert(session->kernel_session); | |
2833 | ||
2834 | /* Copy session output to the newly created Kernel session */ | |
2835 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2836 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2837 | goto error; |
2838 | } | |
2839 | ||
2f77fc4b DG |
2840 | /* Create directory(ies) on local filesystem. */ |
2841 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2842 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2843 | ret = run_as_mkdir_recursive( | |
2844 | session->kernel_session->consumer->dst.trace_path, | |
2845 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2846 | if (ret < 0) { | |
df5b86c8 | 2847 | if (errno != EEXIST) { |
2f77fc4b | 2848 | ERR("Trace directory creation error"); |
00e2e675 DG |
2849 | goto error; |
2850 | } | |
00e2e675 | 2851 | } |
2f77fc4b | 2852 | } |
00e2e675 | 2853 | |
2f77fc4b DG |
2854 | session->kernel_session->uid = session->uid; |
2855 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2856 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2857 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2858 | |
f73fabfd | 2859 | return LTTNG_OK; |
00e2e675 | 2860 | |
2f77fc4b DG |
2861 | error: |
2862 | trace_kernel_destroy_session(session->kernel_session); | |
2863 | session->kernel_session = NULL; | |
2864 | return ret; | |
2865 | } | |
00e2e675 | 2866 | |
2f77fc4b DG |
2867 | /* |
2868 | * Count number of session permitted by uid/gid. | |
2869 | */ | |
2870 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2871 | { | |
2872 | unsigned int i = 0; | |
2873 | struct ltt_session *session; | |
07424f16 | 2874 | |
2f77fc4b DG |
2875 | DBG("Counting number of available session for UID %d GID %d", |
2876 | uid, gid); | |
2877 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2878 | /* |
2f77fc4b | 2879 | * Only list the sessions the user can control. |
00e2e675 | 2880 | */ |
2f77fc4b DG |
2881 | if (!session_access_ok(session, uid, gid)) { |
2882 | continue; | |
2883 | } | |
2884 | i++; | |
a4b92340 | 2885 | } |
2f77fc4b | 2886 | return i; |
00e2e675 DG |
2887 | } |
2888 | ||
54d01ffb DG |
2889 | /* |
2890 | * Process the command requested by the lttng client within the command | |
2891 | * context structure. This function make sure that the return structure (llm) | |
2892 | * is set and ready for transmission before returning. | |
2893 | * | |
2894 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2895 | * |
2896 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2897 | * |
2898 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2899 | */ |
53a80697 MD |
2900 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2901 | int *sock_error) | |
54d01ffb | 2902 | { |
f73fabfd | 2903 | int ret = LTTNG_OK; |
44d3bd01 | 2904 | int need_tracing_session = 1; |
2e09ba09 | 2905 | int need_domain; |
54d01ffb DG |
2906 | |
2907 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2908 | ||
3745d315 MD |
2909 | assert(!rcu_read_ongoing()); |
2910 | ||
53a80697 MD |
2911 | *sock_error = 0; |
2912 | ||
2e09ba09 MD |
2913 | switch (cmd_ctx->lsm->cmd_type) { |
2914 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2915 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2916 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
2917 | case LTTNG_DESTROY_SESSION: |
2918 | case LTTNG_LIST_SESSIONS: | |
2919 | case LTTNG_LIST_DOMAINS: | |
2920 | case LTTNG_START_TRACE: | |
2921 | case LTTNG_STOP_TRACE: | |
6d805429 | 2922 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2923 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2924 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2925 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2926 | case LTTNG_SNAPSHOT_RECORD: | |
fb198a11 | 2927 | case LTTNG_SAVE_SESSION: |
d7ba1388 | 2928 | case LTTNG_SET_SESSION_SHM_PATH: |
eded6438 | 2929 | case LTTNG_REGENERATE_METADATA: |
c2561365 | 2930 | case LTTNG_REGENERATE_STATEDUMP: |
b3530820 JG |
2931 | case LTTNG_REGISTER_TRIGGER: |
2932 | case LTTNG_UNREGISTER_TRIGGER: | |
e8526e3f | 2933 | case LTTNG_CLEAR_SESSION: |
2e09ba09 | 2934 | need_domain = 0; |
3aace903 | 2935 | break; |
2e09ba09 MD |
2936 | default: |
2937 | need_domain = 1; | |
2938 | } | |
2939 | ||
87c3f04b | 2940 | if (config.no_kernel && need_domain |
2e09ba09 | 2941 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
531d29f9 | 2942 | if (!is_root) { |
f73fabfd | 2943 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2944 | } else { |
f73fabfd | 2945 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2946 | } |
4fba7219 DG |
2947 | goto error; |
2948 | } | |
2949 | ||
8d3113b2 DG |
2950 | /* Deny register consumer if we already have a spawned consumer. */ |
2951 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2952 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2953 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2954 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2955 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2956 | goto error; |
2957 | } | |
2958 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2959 | } | |
2960 | ||
54d01ffb DG |
2961 | /* |
2962 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2963 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2964 | * command. |
2965 | */ | |
2966 | switch(cmd_ctx->lsm->cmd_type) { | |
2967 | case LTTNG_LIST_SESSIONS: | |
2968 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2969 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2970 | case LTTNG_LIST_DOMAINS: |
2971 | case LTTNG_LIST_CHANNELS: | |
2972 | case LTTNG_LIST_EVENTS: | |
834978fd | 2973 | case LTTNG_LIST_SYSCALLS: |
a5dfbb9d | 2974 | case LTTNG_LIST_TRACKER_PIDS: |
5cd0780d | 2975 | case LTTNG_DATA_PENDING: |
54d01ffb DG |
2976 | break; |
2977 | default: | |
2978 | /* Setup lttng message with no payload */ | |
6e10c9b9 | 2979 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
54d01ffb DG |
2980 | if (ret < 0) { |
2981 | /* This label does not try to unlock the session */ | |
2982 | goto init_setup_error; | |
2983 | } | |
2984 | } | |
2985 | ||
2986 | /* Commands that DO NOT need a session. */ | |
2987 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2988 | case LTTNG_CREATE_SESSION: |
27babd3a | 2989 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2990 | case LTTNG_CREATE_SESSION_LIVE: |
54d01ffb DG |
2991 | case LTTNG_LIST_SESSIONS: |
2992 | case LTTNG_LIST_TRACEPOINTS: | |
834978fd | 2993 | case LTTNG_LIST_SYSCALLS: |
f37d259d | 2994 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
fb198a11 | 2995 | case LTTNG_SAVE_SESSION: |
b3530820 JG |
2996 | case LTTNG_REGISTER_TRIGGER: |
2997 | case LTTNG_UNREGISTER_TRIGGER: | |
44d3bd01 | 2998 | need_tracing_session = 0; |
54d01ffb DG |
2999 | break; |
3000 | default: | |
3001 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3002 | /* |
3003 | * We keep the session list lock across _all_ commands | |
3004 | * for now, because the per-session lock does not | |
3005 | * handle teardown properly. | |
3006 | */ | |
74babd95 | 3007 | session_lock_list(); |
54d01ffb DG |
3008 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3009 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 3010 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
3011 | goto error; |
3012 | } else { | |
3013 | /* Acquire lock for the session */ | |
3014 | session_lock(cmd_ctx->session); | |
3015 | } | |
3016 | break; | |
3017 | } | |
b389abbe | 3018 | |
5f3ecf22 DG |
3019 | /* |
3020 | * Commands that need a valid session but should NOT create one if none | |
3021 | * exists. Instead of creating one and destroying it when the command is | |
3022 | * handled, process that right before so we save some round trip in useless | |
3023 | * code path. | |
3024 | */ | |
3025 | switch (cmd_ctx->lsm->cmd_type) { | |
3026 | case LTTNG_DISABLE_CHANNEL: | |
3027 | case LTTNG_DISABLE_EVENT: | |
5f3ecf22 DG |
3028 | switch (cmd_ctx->lsm->domain.type) { |
3029 | case LTTNG_DOMAIN_KERNEL: | |
3030 | if (!cmd_ctx->session->kernel_session) { | |
3031 | ret = LTTNG_ERR_NO_CHANNEL; | |
3032 | goto error; | |
3033 | } | |
3034 | break; | |
3035 | case LTTNG_DOMAIN_JUL: | |
5cdb6027 | 3036 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3037 | case LTTNG_DOMAIN_PYTHON: |
5f3ecf22 DG |
3038 | case LTTNG_DOMAIN_UST: |
3039 | if (!cmd_ctx->session->ust_session) { | |
3040 | ret = LTTNG_ERR_NO_CHANNEL; | |
3041 | goto error; | |
3042 | } | |
3043 | break; | |
3044 | default: | |
3045 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3046 | goto error; | |
3047 | } | |
3048 | default: | |
3049 | break; | |
3050 | } | |
3051 | ||
2e09ba09 MD |
3052 | if (!need_domain) { |
3053 | goto skip_domain; | |
3054 | } | |
a4b92340 | 3055 | |
54d01ffb DG |
3056 | /* |
3057 | * Check domain type for specific "pre-action". | |
3058 | */ | |
3059 | switch (cmd_ctx->lsm->domain.type) { | |
3060 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3061 | if (!is_root) { |
f73fabfd | 3062 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3063 | goto error; |
3064 | } | |
3065 | ||
54d01ffb | 3066 | /* Kernel tracer check */ |
a4b35e07 | 3067 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3068 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3069 | ret = init_kernel_tracer(); |
3070 | if (ret != 0) { | |
54d01ffb DG |
3071 | goto error; |
3072 | } | |
3073 | } | |
5eb91c98 | 3074 | |
5c827ce0 DG |
3075 | /* Consumer is in an ERROR state. Report back to client */ |
3076 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3077 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3078 | goto error; |
3079 | } | |
3080 | ||
54d01ffb | 3081 | /* Need a session for kernel command */ |
44d3bd01 | 3082 | if (need_tracing_session) { |
54d01ffb | 3083 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3084 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3085 | if (ret < 0) { |
f73fabfd | 3086 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
3087 | goto error; |
3088 | } | |
b389abbe | 3089 | } |
7d29a247 | 3090 | |
54d01ffb | 3091 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3092 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3093 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 3094 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3095 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3096 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3097 | if (ret < 0) { |
f73fabfd | 3098 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 3099 | goto error; |
950131af | 3100 | } |
5c827ce0 | 3101 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3102 | } else { |
3103 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3104 | } |
173af62f | 3105 | |
a4b92340 DG |
3106 | /* |
3107 | * The consumer was just spawned so we need to add the socket to | |
3108 | * the consumer output of the session if exist. | |
3109 | */ | |
3110 | ret = consumer_create_socket(&kconsumer_data, | |
3111 | cmd_ctx->session->kernel_session->consumer); | |
3112 | if (ret < 0) { | |
3113 | goto error; | |
173af62f | 3114 | } |
0d0c377a | 3115 | } |
5c827ce0 | 3116 | |
54d01ffb | 3117 | break; |
b9dfb167 | 3118 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3119 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3120 | case LTTNG_DOMAIN_PYTHON: |
2bdd86d4 | 3121 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3122 | { |
b51ec5b4 MD |
3123 | if (!ust_app_supported()) { |
3124 | ret = LTTNG_ERR_NO_UST; | |
3125 | goto error; | |
3126 | } | |
5c827ce0 DG |
3127 | /* Consumer is in an ERROR state. Report back to client */ |
3128 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3129 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3130 | goto error; |
3131 | } | |
3132 | ||
44d3bd01 | 3133 | if (need_tracing_session) { |
a4b92340 | 3134 | /* Create UST session if none exist. */ |
f6a9efaa | 3135 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3136 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3137 | &cmd_ctx->lsm->domain); |
f73fabfd | 3138 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
3139 | goto error; |
3140 | } | |
3141 | } | |
00e2e675 | 3142 | |
7753dea8 MD |
3143 | /* Start the UST consumer daemons */ |
3144 | /* 64-bit */ | |
3145 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
87c3f04b | 3146 | if (config.consumerd64_bin_path.value && |
7753dea8 | 3147 | ustconsumer64_data.pid == 0 && |
785d2d0d | 3148 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3149 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3150 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3151 | if (ret < 0) { |
f73fabfd | 3152 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 3153 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
3154 | goto error; |
3155 | } | |
48842b30 | 3156 | |
173af62f | 3157 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 3158 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3159 | } else { |
7753dea8 MD |
3160 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3161 | } | |
173af62f DG |
3162 | |
3163 | /* | |
3164 | * Setup socket for consumer 64 bit. No need for atomic access | |
3165 | * since it was set above and can ONLY be set in this thread. | |
3166 | */ | |
a4b92340 DG |
3167 | ret = consumer_create_socket(&ustconsumer64_data, |
3168 | cmd_ctx->session->ust_session->consumer); | |
3169 | if (ret < 0) { | |
3170 | goto error; | |
173af62f DG |
3171 | } |
3172 | ||
7753dea8 | 3173 | /* 32-bit */ |
385b881b | 3174 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
87c3f04b | 3175 | if (config.consumerd32_bin_path.value && |
7753dea8 | 3176 | ustconsumer32_data.pid == 0 && |
785d2d0d | 3177 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3178 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
3179 | ret = start_consumerd(&ustconsumer32_data); | |
3180 | if (ret < 0) { | |
f73fabfd | 3181 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 3182 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
3183 | goto error; |
3184 | } | |
5c827ce0 | 3185 | |
173af62f | 3186 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 3187 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3188 | } else { |
3189 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3190 | } |
173af62f DG |
3191 | |
3192 | /* | |
3193 | * Setup socket for consumer 64 bit. No need for atomic access | |
3194 | * since it was set above and can ONLY be set in this thread. | |
3195 | */ | |
a4b92340 DG |
3196 | ret = consumer_create_socket(&ustconsumer32_data, |
3197 | cmd_ctx->session->ust_session->consumer); | |
3198 | if (ret < 0) { | |
3199 | goto error; | |
173af62f | 3200 | } |
44d3bd01 DG |
3201 | } |
3202 | break; | |
48842b30 | 3203 | } |
54d01ffb | 3204 | default: |
54d01ffb DG |
3205 | break; |
3206 | } | |
2e09ba09 | 3207 | skip_domain: |
33a2b854 | 3208 | |
5c827ce0 DG |
3209 | /* Validate consumer daemon state when start/stop trace command */ |
3210 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3211 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3212 | switch (cmd_ctx->lsm->domain.type) { | |
e7619875 JG |
3213 | case LTTNG_DOMAIN_NONE: |
3214 | break; | |
b9dfb167 | 3215 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3216 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3217 | case LTTNG_DOMAIN_PYTHON: |
5c827ce0 DG |
3218 | case LTTNG_DOMAIN_UST: |
3219 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3220 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3221 | goto error; |
3222 | } | |
3223 | break; | |
3224 | case LTTNG_DOMAIN_KERNEL: | |
3225 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3226 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3227 | goto error; |
3228 | } | |
3229 | break; | |
825535cc JG |
3230 | default: |
3231 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3232 | goto error; | |
5c827ce0 DG |
3233 | } |
3234 | } | |
3235 | ||
8e0af1b4 MD |
3236 | /* |
3237 | * Check that the UID or GID match that of the tracing session. | |
3238 | * The root user can interact with all sessions. | |
3239 | */ | |
3240 | if (need_tracing_session) { | |
3241 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3242 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3243 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 3244 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
3245 | goto error; |
3246 | } | |
3247 | } | |
3248 | ||
ffe60014 DG |
3249 | /* |
3250 | * Send relayd information to consumer as soon as we have a domain and a | |
3251 | * session defined. | |
3252 | */ | |
3253 | if (cmd_ctx->session && need_domain) { | |
3254 | /* | |
3255 | * Setup relayd if not done yet. If the relayd information was already | |
3256 | * sent to the consumer, this call will gracefully return. | |
3257 | */ | |
3258 | ret = cmd_setup_relayd(cmd_ctx->session); | |
3259 | if (ret != LTTNG_OK) { | |
3260 | goto error; | |
3261 | } | |
3262 | } | |
3263 | ||
54d01ffb DG |
3264 | /* Process by command type */ |
3265 | switch (cmd_ctx->lsm->cmd_type) { | |
3266 | case LTTNG_ADD_CONTEXT: | |
3267 | { | |
2001793c JG |
3268 | /* |
3269 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
3270 | * payload if the context being added is an application context. | |
3271 | */ | |
3272 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
3273 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
3274 | char *provider_name = NULL, *context_name = NULL; | |
3275 | size_t provider_name_len = | |
3276 | cmd_ctx->lsm->u.context.provider_name_len; | |
3277 | size_t context_name_len = | |
3278 | cmd_ctx->lsm->u.context.context_name_len; | |
3279 | ||
3280 | if (provider_name_len == 0 || context_name_len == 0) { | |
3281 | /* | |
3282 | * Application provider and context names MUST | |
3283 | * be provided. | |
3284 | */ | |
3285 | ret = -LTTNG_ERR_INVALID; | |
3286 | goto error; | |
3287 | } | |
3288 | ||
3289 | provider_name = zmalloc(provider_name_len + 1); | |
3290 | if (!provider_name) { | |
3291 | ret = -LTTNG_ERR_NOMEM; | |
3292 | goto error; | |
3293 | } | |
e0f4d107 JG |
3294 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
3295 | provider_name; | |
2001793c JG |
3296 | |
3297 | context_name = zmalloc(context_name_len + 1); | |
3298 | if (!context_name) { | |
3299 | ret = -LTTNG_ERR_NOMEM; | |
3300 | goto error_add_context; | |
3301 | } | |
e0f4d107 JG |
3302 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
3303 | context_name; | |
2001793c JG |
3304 | |
3305 | ret = lttcomm_recv_unix_sock(sock, provider_name, | |
3306 | provider_name_len); | |
3307 | if (ret < 0) { | |
3308 | goto error_add_context; | |
3309 | } | |
3310 | ||
3311 | ret = lttcomm_recv_unix_sock(sock, context_name, | |
3312 | context_name_len); | |
3313 | if (ret < 0) { | |
3314 | goto error_add_context; | |
3315 | } | |
2001793c JG |
3316 | } |
3317 | ||
3318 | /* | |
3319 | * cmd_add_context assumes ownership of the provider and context | |
3320 | * names. | |
3321 | */ | |
3322 | ret = cmd_add_context(cmd_ctx->session, | |
3323 | cmd_ctx->lsm->domain.type, | |
54d01ffb | 3324 | cmd_ctx->lsm->u.context.channel_name, |
2001793c JG |
3325 | &cmd_ctx->lsm->u.context.ctx, |
3326 | kernel_poll_pipe[1]); | |
3327 | ||
3328 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
3329 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
3330 | error_add_context: | |
3331 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
3332 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
3333 | if (ret < 0) { | |
3334 | goto error; | |
3335 | } | |
54d01ffb DG |
3336 | break; |
3337 | } | |
3338 | case LTTNG_DISABLE_CHANNEL: | |
3339 | { | |
3340 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3341 | cmd_ctx->lsm->u.disable.channel_name); | |
3342 | break; | |
3343 | } | |
3344 | case LTTNG_DISABLE_EVENT: | |
3345 | { | |
47b7e2f9 JG |
3346 | |
3347 | /* | |
3348 | * FIXME: handle filter; for now we just receive the filter's | |
3349 | * bytecode along with the filter expression which are sent by | |
3350 | * liblttng-ctl and discard them. | |
3351 | * | |
3352 | * This fixes an issue where the client may block while sending | |
3353 | * the filter payload and encounter an error because the session | |
3354 | * daemon closes the socket without ever handling this data. | |
3355 | */ | |
3356 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
3357 | cmd_ctx->lsm->u.disable.bytecode_len; | |
3358 | ||
3359 | if (count) { | |
3360 | char data[LTTNG_FILTER_MAX_LEN]; | |
3361 | ||
3362 | DBG("Discarding disable event command payload of size %zu", count); | |
3363 | while (count) { | |
3364 | ret = lttcomm_recv_unix_sock(sock, data, | |
3365 | count > sizeof(data) ? sizeof(data) : count); | |
3366 | if (ret < 0) { | |
3367 | goto error; | |
3368 | } | |
3369 | ||
3370 | count -= (size_t) ret; | |
3371 | } | |
3372 | } | |
6e911cad | 3373 | /* FIXME: passing packed structure to non-packed pointer */ |
54d01ffb DG |
3374 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3375 | cmd_ctx->lsm->u.disable.channel_name, | |
6e911cad | 3376 | &cmd_ctx->lsm->u.disable.event); |
33a2b854 DG |
3377 | break; |
3378 | } | |
54d01ffb DG |
3379 | case LTTNG_ENABLE_CHANNEL: |
3380 | { | |
b3530820 JG |
3381 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = |
3382 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
7972aab2 | 3383 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
b3530820 JG |
3384 | &cmd_ctx->lsm->u.channel.chan, |
3385 | kernel_poll_pipe[1]); | |
54d01ffb DG |
3386 | break; |
3387 | } | |
ccf10263 MD |
3388 | case LTTNG_TRACK_PID: |
3389 | { | |
3390 | ret = cmd_track_pid(cmd_ctx->session, | |
3391 | cmd_ctx->lsm->domain.type, | |
3392 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3393 | break; | |
3394 | } | |
3395 | case LTTNG_UNTRACK_PID: | |
3396 | { | |
3397 | ret = cmd_untrack_pid(cmd_ctx->session, | |
3398 | cmd_ctx->lsm->domain.type, | |
3399 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3400 | break; | |
3401 | } | |
54d01ffb DG |
3402 | case LTTNG_ENABLE_EVENT: |
3403 | { | |
882ef835 JI |
3404 | struct lttng_event_exclusion *exclusion = NULL; |
3405 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3406 | char *filter_expression = NULL; |
882ef835 | 3407 | |
67676bd8 DG |
3408 | /* Handle exclusion events and receive it from the client. */ |
3409 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3410 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3411 | ||
3412 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3413 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3414 | if (!exclusion) { | |
3415 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3416 | goto error; | |
882ef835 | 3417 | } |
882ef835 | 3418 | |
67676bd8 DG |
3419 | DBG("Receiving var len exclusion event list from client ..."); |
3420 | exclusion->count = count; | |
3421 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3422 | count * LTTNG_SYMBOL_NAME_LEN); | |
3423 | if (ret <= 0) { | |
3424 | DBG("Nothing recv() from client var len data... continuing"); | |
3425 | *sock_error = 1; | |
3426 | free(exclusion); | |
3427 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3428 | goto error; | |
3429 | } | |
3430 | } | |
3431 | ||
6b453b5e JG |
3432 | /* Get filter expression from client. */ |
3433 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3434 | size_t expression_len = | |
3435 | cmd_ctx->lsm->u.enable.expression_len; | |
3436 | ||
3437 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3438 | ret = LTTNG_ERR_FILTER_INVAL; | |
3439 | free(exclusion); | |
3440 | goto error; | |
3441 | } | |
3442 | ||
3443 | filter_expression = zmalloc(expression_len); | |
3444 | if (!filter_expression) { | |
3445 | free(exclusion); | |
3446 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3447 | goto error; | |
3448 | } | |
3449 | ||
3450 | /* Receive var. len. data */ | |
3451 | DBG("Receiving var len filter's expression from client ..."); | |
3452 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3453 | expression_len); | |
3454 | if (ret <= 0) { | |
3455 | DBG("Nothing recv() from client car len data... continuing"); | |
3456 | *sock_error = 1; | |
3457 | free(filter_expression); | |
3458 | free(exclusion); | |
3459 | ret = LTTNG_ERR_FILTER_INVAL; | |
3460 | goto error; | |
3461 | } | |
3462 | } | |
3463 | ||
67676bd8 DG |
3464 | /* Handle filter and get bytecode from client. */ |
3465 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3466 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3467 | ||
3468 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3469 | ret = LTTNG_ERR_FILTER_INVAL; | |
49d21f93 | 3470 | free(filter_expression); |
67676bd8 DG |
3471 | free(exclusion); |
3472 | goto error; | |
3473 | } | |
3474 | ||
3475 | bytecode = zmalloc(bytecode_len); | |
3476 | if (!bytecode) { | |
49d21f93 | 3477 | free(filter_expression); |
67676bd8 DG |
3478 | free(exclusion); |
3479 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3480 | goto error; | |
882ef835 JI |
3481 | } |
3482 | ||
67676bd8 DG |
3483 | /* Receive var. len. data */ |
3484 | DBG("Receiving var len filter's bytecode from client ..."); | |
3485 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3486 | if (ret <= 0) { | |
3487 | DBG("Nothing recv() from client car len data... continuing"); | |
3488 | *sock_error = 1; | |
49d21f93 | 3489 | free(filter_expression); |
67676bd8 DG |
3490 | free(bytecode); |
3491 | free(exclusion); | |
3492 | ret = LTTNG_ERR_FILTER_INVAL; | |
3493 | goto error; | |
3494 | } | |
3495 | ||
3496 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
49d21f93 | 3497 | free(filter_expression); |
67676bd8 DG |
3498 | free(bytecode); |
3499 | free(exclusion); | |
3500 | ret = LTTNG_ERR_FILTER_INVAL; | |
3501 | goto error; | |
3502 | } | |
882ef835 | 3503 | } |
67676bd8 DG |
3504 | |
3505 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, | |
3506 | cmd_ctx->lsm->u.enable.channel_name, | |
6b453b5e JG |
3507 | &cmd_ctx->lsm->u.enable.event, |
3508 | filter_expression, bytecode, exclusion, | |
67676bd8 | 3509 | kernel_poll_pipe[1]); |
54d01ffb DG |
3510 | break; |
3511 | } | |
052da939 | 3512 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3513 | { |
9f19cc17 | 3514 | struct lttng_event *events; |
54d01ffb | 3515 | ssize_t nb_events; |
052da939 | 3516 | |
0845bbfa | 3517 | session_lock_list(); |
54d01ffb | 3518 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
0845bbfa | 3519 | session_unlock_list(); |
54d01ffb | 3520 | if (nb_events < 0) { |
f73fabfd | 3521 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3522 | ret = -nb_events; |
3523 | goto error; | |
2ef84c95 DG |
3524 | } |
3525 | ||
3526 | /* | |
3527 | * Setup lttng message with payload size set to the event list size in | |
3528 | * bytes and then copy list into the llm payload. | |
3529 | */ | |
6e10c9b9 PP |
3530 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3531 | sizeof(struct lttng_event) * nb_events); | |
3532 | free(events); | |
3533 | ||
2ef84c95 DG |
3534 | if (ret < 0) { |
3535 | goto setup_error; | |
3536 | } | |
3537 | ||
f73fabfd | 3538 | ret = LTTNG_OK; |
2ef84c95 DG |
3539 | break; |
3540 | } | |
f37d259d MD |
3541 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3542 | { | |
3543 | struct lttng_event_field *fields; | |
3544 | ssize_t nb_fields; | |
3545 | ||
0845bbfa | 3546 | session_lock_list(); |
a4b92340 DG |
3547 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3548 | &fields); | |
0845bbfa | 3549 | session_unlock_list(); |
f37d259d | 3550 | if (nb_fields < 0) { |
f73fabfd | 3551 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3552 | ret = -nb_fields; |
3553 | goto error; | |
3554 | } | |
3555 | ||
3556 | /* | |
3557 | * Setup lttng message with payload size set to the event list size in | |
3558 | * bytes and then copy list into the llm payload. | |
3559 | */ | |
6e10c9b9 | 3560 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
a4b92340 | 3561 | sizeof(struct lttng_event_field) * nb_fields); |
6e10c9b9 PP |
3562 | free(fields); |
3563 | ||
f37d259d | 3564 | if (ret < 0) { |
f37d259d MD |
3565 | goto setup_error; |
3566 | } | |
3567 | ||
f73fabfd | 3568 | ret = LTTNG_OK; |
f37d259d MD |
3569 | break; |
3570 | } | |
834978fd DG |
3571 | case LTTNG_LIST_SYSCALLS: |
3572 | { | |
3573 | struct lttng_event *events; | |
3574 | ssize_t nb_events; | |
3575 | ||
3576 | nb_events = cmd_list_syscalls(&events); | |
3577 | if (nb_events < 0) { | |
3578 | /* Return value is a negative lttng_error_code. */ | |
3579 | ret = -nb_events; | |
3580 | goto error; | |
3581 | } | |
3582 | ||
3583 | /* | |
3584 | * Setup lttng message with payload size set to the event list size in | |
3585 | * bytes and then copy list into the llm payload. | |
3586 | */ | |
6e10c9b9 PP |
3587 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3588 | sizeof(struct lttng_event) * nb_events); | |
3589 | free(events); | |
3590 | ||
834978fd | 3591 | if (ret < 0) { |
834978fd DG |
3592 | goto setup_error; |
3593 | } | |
3594 | ||
834978fd DG |
3595 | ret = LTTNG_OK; |
3596 | break; | |
3597 | } | |
a5dfbb9d MD |
3598 | case LTTNG_LIST_TRACKER_PIDS: |
3599 | { | |
3600 | int32_t *pids = NULL; | |
3601 | ssize_t nr_pids; | |
3602 | ||
3603 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
3604 | cmd_ctx->lsm->domain.type, &pids); | |
3605 | if (nr_pids < 0) { | |
3606 | /* Return value is a negative lttng_error_code. */ | |
3607 | ret = -nr_pids; | |
3608 | goto error; | |
3609 | } | |
3610 | ||
3611 | /* | |
3612 | * Setup lttng message with payload size set to the event list size in | |
3613 | * bytes and then copy list into the llm payload. | |
3614 | */ | |
6e10c9b9 PP |
3615 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, |
3616 | sizeof(int32_t) * nr_pids); | |
3617 | free(pids); | |
3618 | ||
a5dfbb9d | 3619 | if (ret < 0) { |
a5dfbb9d MD |
3620 | goto setup_error; |
3621 | } | |
3622 | ||
a5dfbb9d MD |
3623 | ret = LTTNG_OK; |
3624 | break; | |
3625 | } | |
00e2e675 DG |
3626 | case LTTNG_SET_CONSUMER_URI: |
3627 | { | |
a4b92340 DG |
3628 | size_t nb_uri, len; |
3629 | struct lttng_uri *uris; | |
3630 | ||
3631 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3632 | len = nb_uri * sizeof(struct lttng_uri); | |
3633 | ||
3634 | if (nb_uri == 0) { | |
f73fabfd | 3635 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3636 | goto error; |
3637 | } | |
3638 | ||
3639 | uris = zmalloc(len); | |
3640 | if (uris == NULL) { | |
f73fabfd | 3641 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3642 | goto error; |
3643 | } | |
3644 | ||
3645 | /* Receive variable len data */ | |
77c7c900 | 3646 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3647 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3648 | if (ret <= 0) { | |
3649 | DBG("No URIs received from client... continuing"); | |
3650 | *sock_error = 1; | |
f73fabfd | 3651 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3652 | free(uris); |
a4b92340 DG |
3653 | goto error; |
3654 | } | |
3655 | ||
bda32d56 JG |
3656 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
3657 | free(uris); | |
f73fabfd | 3658 | if (ret != LTTNG_OK) { |
a4b92340 DG |
3659 | goto error; |
3660 | } | |
3661 | ||
b1d41407 | 3662 | |
00e2e675 DG |
3663 | break; |
3664 | } | |
f3ed775e | 3665 | case LTTNG_START_TRACE: |
8c0faa1d | 3666 | { |
54d01ffb | 3667 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3668 | break; |
3669 | } | |
f3ed775e | 3670 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3671 | { |
54d01ffb | 3672 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3673 | break; |
3674 | } | |
5e16da05 MD |
3675 | case LTTNG_CREATE_SESSION: |
3676 | { | |
a4b92340 DG |
3677 | size_t nb_uri, len; |
3678 | struct lttng_uri *uris = NULL; | |
3679 | ||
3680 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3681 | len = nb_uri * sizeof(struct lttng_uri); | |
3682 | ||
3683 | if (nb_uri > 0) { | |
3684 | uris = zmalloc(len); | |
3685 | if (uris == NULL) { | |
f73fabfd | 3686 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3687 | goto error; |
3688 | } | |
3689 | ||
3690 | /* Receive variable len data */ | |
77c7c900 | 3691 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3692 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3693 | if (ret <= 0) { | |
3694 | DBG("No URIs received from client... continuing"); | |
3695 | *sock_error = 1; | |
f73fabfd | 3696 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3697 | free(uris); |
a4b92340 DG |
3698 | goto error; |
3699 | } | |
3700 | ||
3701 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3702 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3703 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3704 | free(uris); |
a4b92340 DG |
3705 | goto error; |
3706 | } | |
3707 | } | |
3708 | ||
3709 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3710 | &cmd_ctx->creds, 0); |
a4b92340 | 3711 | |
b1d41407 DG |
3712 | free(uris); |
3713 | ||
00e2e675 DG |
3714 | break; |
3715 | } | |
5e16da05 MD |
3716 | case LTTNG_DESTROY_SESSION: |
3717 | { | |
2f77fc4b | 3718 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3719 | |
3720 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3721 | cmd_ctx->session = NULL; |
5461b305 | 3722 | break; |
5e16da05 | 3723 | } |
9f19cc17 | 3724 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3725 | { |
54d01ffb | 3726 | ssize_t nb_dom; |
fa64dfb4 | 3727 | struct lttng_domain *domains = NULL; |
5461b305 | 3728 | |
54d01ffb DG |
3729 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3730 | if (nb_dom < 0) { | |
f73fabfd | 3731 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3732 | ret = -nb_dom; |
3733 | goto error; | |
ce3d728c | 3734 | } |
520ff687 | 3735 | |
6e10c9b9 PP |
3736 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
3737 | nb_dom * sizeof(struct lttng_domain)); | |
3738 | free(domains); | |
3739 | ||
5461b305 DG |
3740 | if (ret < 0) { |
3741 | goto setup_error; | |
520ff687 | 3742 | } |
57167058 | 3743 | |
f73fabfd | 3744 | ret = LTTNG_OK; |
5e16da05 MD |
3745 | break; |
3746 | } | |
9f19cc17 | 3747 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3748 | { |
53e367f9 | 3749 | ssize_t payload_size; |
ade7ce52 | 3750 | struct lttng_channel *channels = NULL; |
54d01ffb | 3751 | |
53e367f9 | 3752 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
b551a063 | 3753 | cmd_ctx->session, &channels); |
53e367f9 | 3754 | if (payload_size < 0) { |
f73fabfd | 3755 | /* Return value is a negative lttng_error_code. */ |
53e367f9 | 3756 | ret = -payload_size; |
54d01ffb | 3757 | goto error; |
5461b305 | 3758 | } |
ca95a216 | 3759 | |
6e10c9b9 | 3760 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
53e367f9 | 3761 | payload_size); |
6e10c9b9 PP |
3762 | free(channels); |
3763 | ||
5461b305 DG |
3764 | if (ret < 0) { |
3765 | goto setup_error; | |
3766 | } | |
9f19cc17 | 3767 | |
f73fabfd | 3768 | ret = LTTNG_OK; |
5461b305 | 3769 | break; |
5e16da05 | 3770 | } |
9f19cc17 | 3771 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3772 | { |
b551a063 | 3773 | ssize_t nb_event; |
684d34d2 | 3774 | struct lttng_event *events = NULL; |
b4e3ceb9 PP |
3775 | struct lttcomm_event_command_header cmd_header; |
3776 | size_t total_size; | |
3777 | ||
b2d66287 | 3778 | memset(&cmd_header, 0, sizeof(cmd_header)); |
b4e3ceb9 PP |
3779 | /* Extended infos are included at the end of events */ |
3780 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
3781 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
3782 | &events, &total_size); | |
9f19cc17 | 3783 | |
54d01ffb | 3784 | if (nb_event < 0) { |
f73fabfd | 3785 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3786 | ret = -nb_event; |
3787 | goto error; | |
5461b305 | 3788 | } |
ca95a216 | 3789 | |
b4e3ceb9 PP |
3790 | cmd_header.nb_events = nb_event; |
3791 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
3792 | &cmd_header, sizeof(cmd_header)); | |
6e10c9b9 PP |
3793 | free(events); |
3794 | ||
5461b305 DG |
3795 | if (ret < 0) { |
3796 | goto setup_error; | |
3797 | } | |
9f19cc17 | 3798 | |
f73fabfd | 3799 | ret = LTTNG_OK; |
5461b305 | 3800 | break; |
5e16da05 MD |
3801 | } |
3802 | case LTTNG_LIST_SESSIONS: | |
3803 | { | |
8e0af1b4 | 3804 | unsigned int nr_sessions; |
6e10c9b9 PP |
3805 | void *sessions_payload; |
3806 | size_t payload_len; | |
5461b305 | 3807 | |
8e0af1b4 | 3808 | session_lock_list(); |
730389d9 DG |
3809 | nr_sessions = lttng_sessions_count( |
3810 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3811 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6e10c9b9 PP |
3812 | payload_len = sizeof(struct lttng_session) * nr_sessions; |
3813 | sessions_payload = zmalloc(payload_len); | |
d32fb093 | 3814 | |
6e10c9b9 | 3815 | if (!sessions_payload) { |
54d01ffb | 3816 | session_unlock_list(); |
6e10c9b9 | 3817 | ret = -ENOMEM; |
5461b305 | 3818 | goto setup_error; |
e065084a | 3819 | } |
5e16da05 | 3820 | |
6e10c9b9 | 3821 | cmd_list_lttng_sessions(sessions_payload, |
730389d9 DG |
3822 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3823 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
54d01ffb | 3824 | session_unlock_list(); |
5e16da05 | 3825 | |
6e10c9b9 PP |
3826 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
3827 | payload_len); | |
3828 | free(sessions_payload); | |
3829 | ||
3830 | if (ret < 0) { | |
3831 | goto setup_error; | |
3832 | } | |
3833 | ||
f73fabfd | 3834 | ret = LTTNG_OK; |
5e16da05 MD |
3835 | break; |
3836 | } | |
d9800920 DG |
3837 | case LTTNG_REGISTER_CONSUMER: |
3838 | { | |
2f77fc4b DG |
3839 | struct consumer_data *cdata; |
3840 | ||
3841 | switch (cmd_ctx->lsm->domain.type) { | |
3842 | case LTTNG_DOMAIN_KERNEL: | |
3843 | cdata = &kconsumer_data; | |
3844 | break; | |
3845 | default: | |
f73fabfd | 3846 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3847 | goto error; |
3848 | } | |
3849 | ||
54d01ffb | 3850 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3851 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3852 | break; |
3853 | } | |
6d805429 | 3854 | case LTTNG_DATA_PENDING: |
806e2684 | 3855 | { |
f6151c55 | 3856 | int pending_ret; |
6e10c9b9 | 3857 | uint8_t pending_ret_byte; |
f6151c55 JG |
3858 | |
3859 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
6e10c9b9 | 3860 | |
f6151c55 JG |
3861 | /* |
3862 | * FIXME | |
3863 | * | |
3864 | * This function may returns 0 or 1 to indicate whether or not | |
3865 | * there is data pending. In case of error, it should return an | |
3866 | * LTTNG_ERR code. However, some code paths may still return | |
3867 | * a nondescript error code, which we handle by returning an | |
3868 | * "unknown" error. | |
3869 | */ | |
3870 | if (pending_ret == 0 || pending_ret == 1) { | |
6e10c9b9 PP |
3871 | /* |
3872 | * ret will be set to LTTNG_OK at the end of | |
3873 | * this function. | |
3874 | */ | |
f6151c55 JG |
3875 | } else if (pending_ret < 0) { |
3876 | ret = LTTNG_ERR_UNK; | |
3877 | goto setup_error; | |
3878 | } else { | |
3879 | ret = pending_ret; | |
3880 | goto setup_error; | |
3881 | } | |
3882 | ||
6e10c9b9 PP |
3883 | pending_ret_byte = (uint8_t) pending_ret; |
3884 | ||
3885 | /* 1 byte to return whether or not data is pending */ | |
3886 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
3887 | &pending_ret_byte, 1); | |
3888 | ||
3889 | if (ret < 0) { | |
3890 | goto setup_error; | |
3891 | } | |
3892 | ||
3893 | ret = LTTNG_OK; | |
806e2684 DG |
3894 | break; |
3895 | } | |
da3c9ec1 DG |
3896 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3897 | { | |
6dc3064a DG |
3898 | struct lttcomm_lttng_output_id reply; |
3899 | ||
3900 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3901 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3902 | if (ret != LTTNG_OK) { | |
3903 | goto error; | |
3904 | } | |
3905 | ||
6e10c9b9 PP |
3906 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
3907 | sizeof(reply)); | |
6dc3064a DG |
3908 | if (ret < 0) { |
3909 | goto setup_error; | |
3910 | } | |
3911 | ||
3912 | /* Copy output list into message payload */ | |
6dc3064a | 3913 | ret = LTTNG_OK; |
da3c9ec1 DG |
3914 | break; |
3915 | } | |
3916 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3917 | { | |
6dc3064a DG |
3918 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3919 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3920 | break; |
3921 | } | |
3922 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3923 | { | |
6dc3064a DG |
3924 | ssize_t nb_output; |
3925 | struct lttng_snapshot_output *outputs = NULL; | |
3926 | ||
3927 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3928 | if (nb_output < 0) { | |
3929 | ret = -nb_output; | |
3930 | goto error; | |
3931 | } | |
3932 | ||
6e10c9b9 PP |
3933 | assert((nb_output > 0 && outputs) || nb_output == 0); |
3934 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
6dc3064a | 3935 | nb_output * sizeof(struct lttng_snapshot_output)); |
6e10c9b9 PP |
3936 | free(outputs); |
3937 | ||
6dc3064a | 3938 | if (ret < 0) { |
6dc3064a DG |
3939 | goto setup_error; |
3940 | } | |
3941 | ||
6dc3064a | 3942 | ret = LTTNG_OK; |
da3c9ec1 DG |
3943 | break; |
3944 | } | |
3945 | case LTTNG_SNAPSHOT_RECORD: | |
3946 | { | |
6dc3064a DG |
3947 | ret = cmd_snapshot_record(cmd_ctx->session, |
3948 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3949 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3950 | break; |
3951 | } | |
27babd3a DG |
3952 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3953 | { | |
3954 | size_t nb_uri, len; | |
3955 | struct lttng_uri *uris = NULL; | |
3956 | ||
3957 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3958 | len = nb_uri * sizeof(struct lttng_uri); | |
3959 | ||
3960 | if (nb_uri > 0) { | |
3961 | uris = zmalloc(len); | |
3962 | if (uris == NULL) { | |
3963 | ret = LTTNG_ERR_FATAL; | |
3964 | goto error; | |
3965 | } | |
3966 | ||
3967 | /* Receive variable len data */ | |
3968 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3969 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3970 | if (ret <= 0) { | |
3971 | DBG("No URIs received from client... continuing"); | |
3972 | *sock_error = 1; | |
3973 | ret = LTTNG_ERR_SESSION_FAIL; | |
3974 | free(uris); | |
3975 | goto error; | |
3976 | } | |
3977 | ||
3978 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3979 | DBG("Creating session with ONE network URI is a bad call"); | |
3980 | ret = LTTNG_ERR_SESSION_FAIL; | |
3981 | free(uris); | |
3982 | goto error; | |
3983 | } | |
3984 | } | |
3985 | ||
3986 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3987 | nb_uri, &cmd_ctx->creds); | |
3988 | free(uris); | |
3989 | break; | |
3990 | } | |
ecc48a90 JD |
3991 | case LTTNG_CREATE_SESSION_LIVE: |
3992 | { | |
3993 | size_t nb_uri, len; | |
3994 | struct lttng_uri *uris = NULL; | |
3995 | ||
3996 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3997 | len = nb_uri * sizeof(struct lttng_uri); | |
3998 | ||
3999 | if (nb_uri > 0) { | |
4000 | uris = zmalloc(len); | |
4001 | if (uris == NULL) { | |
4002 | ret = LTTNG_ERR_FATAL; | |
4003 | goto error; | |
4004 | } | |
4005 | ||
4006 | /* Receive variable len data */ | |
4007 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4008 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4009 | if (ret <= 0) { | |
4010 | DBG("No URIs received from client... continuing"); | |
4011 | *sock_error = 1; | |
4012 | ret = LTTNG_ERR_SESSION_FAIL; | |
4013 | free(uris); | |
4014 | goto error; | |
4015 | } | |
4016 | ||
4017 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4018 | DBG("Creating session with ONE network URI is a bad call"); | |
4019 | ret = LTTNG_ERR_SESSION_FAIL; | |
4020 | free(uris); | |
4021 | goto error; | |
4022 | } | |
4023 | } | |
4024 | ||
4025 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
4026 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
4027 | free(uris); | |
4028 | break; | |
4029 | } | |
fb198a11 JG |
4030 | case LTTNG_SAVE_SESSION: |
4031 | { | |
4032 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
4033 | &cmd_ctx->creds); | |
4034 | break; | |
4035 | } | |
d7ba1388 MD |
4036 | case LTTNG_SET_SESSION_SHM_PATH: |
4037 | { | |
4038 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
4039 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
4040 | break; | |
4041 | } | |
eded6438 | 4042 | case LTTNG_REGENERATE_METADATA: |
93ec662e | 4043 | { |
eded6438 | 4044 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
93ec662e JD |
4045 | break; |
4046 | } | |
c2561365 JD |
4047 | case LTTNG_REGENERATE_STATEDUMP: |
4048 | { | |
4049 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
4050 | break; | |
4051 | } | |
b3530820 JG |
4052 | case LTTNG_REGISTER_TRIGGER: |
4053 | { | |
4054 | ret = cmd_register_trigger(cmd_ctx, sock, | |
4055 | notification_thread_handle); | |
4056 | break; | |
4057 | } | |
4058 | case LTTNG_UNREGISTER_TRIGGER: | |
4059 | { | |
4060 | ret = cmd_unregister_trigger(cmd_ctx, sock, | |
4061 | notification_thread_handle); | |
4062 | break; | |
4063 | } | |
e8526e3f JR |
4064 | case LTTNG_CLEAR_SESSION: |
4065 | { | |
4066 | ret = cmd_clear_session(cmd_ctx->session); | |
e8526e3f JR |
4067 | break; |
4068 | } | |
5e16da05 | 4069 | default: |
f73fabfd | 4070 | ret = LTTNG_ERR_UND; |
5461b305 | 4071 | break; |
fac6795d DG |
4072 | } |
4073 | ||
5461b305 | 4074 | error: |
5461b305 DG |
4075 | if (cmd_ctx->llm == NULL) { |
4076 | DBG("Missing llm structure. Allocating one."); | |
6e10c9b9 | 4077 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
5461b305 DG |
4078 | goto setup_error; |
4079 | } | |
4080 | } | |
54d01ffb | 4081 | /* Set return code */ |
5461b305 | 4082 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 4083 | setup_error: |
b5541356 | 4084 | if (cmd_ctx->session) { |
54d01ffb | 4085 | session_unlock(cmd_ctx->session); |
b5541356 | 4086 | } |
256a5576 MD |
4087 | if (need_tracing_session) { |
4088 | session_unlock_list(); | |
4089 | } | |
54d01ffb | 4090 | init_setup_error: |
3745d315 | 4091 | assert(!rcu_read_ongoing()); |
8028d920 | 4092 | return ret; |
fac6795d DG |
4093 | } |
4094 | ||
44a5e5eb DG |
4095 | /* |
4096 | * Thread managing health check socket. | |
4097 | */ | |
4098 | static void *thread_manage_health(void *data) | |
4099 | { | |
eb4a2943 | 4100 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
4101 | uint32_t revents, nb_fd; |
4102 | struct lttng_poll_event events; | |
0c89d795 MD |
4103 | struct health_comm_msg msg; |
4104 | struct health_comm_reply reply; | |
44a5e5eb DG |
4105 | |
4106 | DBG("[thread] Manage health check started"); | |
4107 | ||
4108 | rcu_register_thread(); | |
4109 | ||
6d737ce4 DG |
4110 | /* We might hit an error path before this is created. */ |
4111 | lttng_poll_init(&events); | |
3cc04881 | 4112 | |
44a5e5eb | 4113 | /* Create unix socket */ |
87c3f04b | 4114 | sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value); |
44a5e5eb DG |
4115 | if (sock < 0) { |
4116 | ERR("Unable to create health check Unix socket"); | |
44a5e5eb DG |
4117 | goto error; |
4118 | } | |
4119 | ||
6c71277b MD |
4120 | if (is_root) { |
4121 | /* lttng health client socket path permissions */ | |
87c3f04b JG |
4122 | ret = chown(config.health_unix_sock_path.value, 0, |
4123 | utils_get_group_id(config.tracing_group_name.value)); | |
6c71277b | 4124 | if (ret < 0) { |
87c3f04b | 4125 | ERR("Unable to set group on %s", config.health_unix_sock_path.value); |
6c71277b | 4126 | PERROR("chown"); |
6c71277b MD |
4127 | goto error; |
4128 | } | |
4129 | ||
87c3f04b | 4130 | ret = chmod(config.health_unix_sock_path.value, |
6c71277b MD |
4131 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
4132 | if (ret < 0) { | |
87c3f04b | 4133 | ERR("Unable to set permissions on %s", config.health_unix_sock_path.value); |
6c71277b | 4134 | PERROR("chmod"); |
6c71277b MD |
4135 | goto error; |
4136 | } | |
4137 | } | |
4138 | ||
b662582b DG |
4139 | /* |
4140 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4141 | * show must go on. | |
4142 | */ | |
4143 | (void) utils_set_fd_cloexec(sock); | |
4144 | ||
44a5e5eb DG |
4145 | ret = lttcomm_listen_unix_sock(sock); |
4146 | if (ret < 0) { | |
4147 | goto error; | |
4148 | } | |
4149 | ||
4150 | /* | |
4151 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4152 | * more will be added to this poll set. | |
4153 | */ | |
d0b96690 | 4154 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
4155 | if (ret < 0) { |
4156 | goto error; | |
4157 | } | |
4158 | ||
4159 | /* Add the application registration socket */ | |
4160 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
4161 | if (ret < 0) { | |
4162 | goto error; | |
4163 | } | |
4164 | ||
ef367a93 | 4165 | sessiond_notify_ready(); |
97bc1426 | 4166 | |
44a5e5eb DG |
4167 | while (1) { |
4168 | DBG("Health check ready"); | |
4169 | ||
44a5e5eb DG |
4170 | /* Inifinite blocking call, waiting for transmission */ |
4171 | restart: | |
4172 | ret = lttng_poll_wait(&events, -1); | |
4173 | if (ret < 0) { | |
4174 | /* | |
4175 | * Restart interrupted system call. | |
4176 | */ | |
4177 | if (errno == EINTR) { | |
4178 | goto restart; | |
4179 | } | |
4180 | goto error; | |
4181 | } | |
4182 | ||
0d9c5d77 DG |
4183 | nb_fd = ret; |
4184 | ||
44a5e5eb DG |
4185 | for (i = 0; i < nb_fd; i++) { |
4186 | /* Fetch once the poll data */ | |
4187 | revents = LTTNG_POLL_GETEV(&events, i); | |
4188 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4189 | ||
fd20dac9 MD |
4190 | if (!revents) { |
4191 | /* No activity for this FD (poll implementation). */ | |
4192 | continue; | |
4193 | } | |
4194 | ||
44a5e5eb | 4195 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4196 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 4197 | if (ret) { |
139ac872 MD |
4198 | err = 0; |
4199 | goto exit; | |
44a5e5eb DG |
4200 | } |
4201 | ||
4202 | /* Event on the registration socket */ | |
4203 | if (pollfd == sock) { | |
03e43155 MD |
4204 | if (revents & LPOLLIN) { |
4205 | continue; | |
4206 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
44a5e5eb DG |
4207 | ERR("Health socket poll error"); |
4208 | goto error; | |
03e43155 MD |
4209 | } else { |
4210 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4211 | goto error; | |
44a5e5eb DG |
4212 | } |
4213 | } | |
4214 | } | |
4215 | ||
4216 | new_sock = lttcomm_accept_unix_sock(sock); | |
4217 | if (new_sock < 0) { | |
4218 | goto error; | |
4219 | } | |
4220 | ||
b662582b DG |
4221 | /* |
4222 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4223 | * show must go on. | |
4224 | */ | |
4225 | (void) utils_set_fd_cloexec(new_sock); | |
4226 | ||
44a5e5eb DG |
4227 | DBG("Receiving data from client for health..."); |
4228 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
4229 | if (ret <= 0) { | |
4230 | DBG("Nothing recv() from client... continuing"); | |
4231 | ret = close(new_sock); | |
4232 | if (ret) { | |
4233 | PERROR("close"); | |
4234 | } | |
44a5e5eb DG |
4235 | continue; |
4236 | } | |
4237 | ||
4238 | rcu_thread_online(); | |
4239 | ||
53efb85a | 4240 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
4241 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
4242 | /* | |
4243 | * health_check_state returns 0 if health is | |
4244 | * bad. | |
4245 | */ | |
4246 | if (!health_check_state(health_sessiond, i)) { | |
4247 | reply.ret_code |= 1ULL << i; | |
4248 | } | |
44a5e5eb DG |
4249 | } |
4250 | ||
6c71277b | 4251 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
4252 | |
4253 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
4254 | if (ret < 0) { | |
4255 | ERR("Failed to send health data back to client"); | |
4256 | } | |
4257 | ||
4258 | /* End of transmission */ | |
4259 | ret = close(new_sock); | |
4260 | if (ret) { | |
4261 | PERROR("close"); | |
4262 | } | |
44a5e5eb DG |
4263 | } |
4264 | ||
139ac872 | 4265 | exit: |
44a5e5eb | 4266 | error: |
139ac872 MD |
4267 | if (err) { |
4268 | ERR("Health error occurred in %s", __func__); | |
4269 | } | |
44a5e5eb | 4270 | DBG("Health check thread dying"); |
87c3f04b | 4271 | unlink(config.health_unix_sock_path.value); |
44a5e5eb DG |
4272 | if (sock >= 0) { |
4273 | ret = close(sock); | |
4274 | if (ret) { | |
4275 | PERROR("close"); | |
4276 | } | |
4277 | } | |
44a5e5eb DG |
4278 | |
4279 | lttng_poll_clean(&events); | |
b11d6a7f | 4280 | stop_threads(); |
44a5e5eb DG |
4281 | rcu_unregister_thread(); |
4282 | return NULL; | |
4283 | } | |
4284 | ||
1d4b027a | 4285 | /* |
d063d709 DG |
4286 | * This thread manage all clients request using the unix client socket for |
4287 | * communication. | |
1d4b027a DG |
4288 | */ |
4289 | static void *thread_manage_clients(void *data) | |
4290 | { | |
139ac872 | 4291 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 4292 | int sock_error; |
5eb91c98 | 4293 | uint32_t revents, nb_fd; |
273ea72c | 4294 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4295 | struct lttng_poll_event events; |
1d4b027a DG |
4296 | |
4297 | DBG("[thread] Manage client started"); | |
4298 | ||
f6a9efaa DG |
4299 | rcu_register_thread(); |
4300 | ||
6c71277b | 4301 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 4302 | |
840cb59c | 4303 | health_code_update(); |
44a5e5eb | 4304 | |
1d4b027a DG |
4305 | ret = lttcomm_listen_unix_sock(client_sock); |
4306 | if (ret < 0) { | |
35df2755 | 4307 | goto error_listen; |
1d4b027a DG |
4308 | } |
4309 | ||
5eb91c98 DG |
4310 | /* |
4311 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4312 | * more will be added to this poll set. | |
4313 | */ | |
d0b96690 | 4314 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 4315 | if (ret < 0) { |
35df2755 | 4316 | goto error_create_poll; |
5eb91c98 | 4317 | } |
273ea72c | 4318 | |
5eb91c98 DG |
4319 | /* Add the application registration socket */ |
4320 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4321 | if (ret < 0) { | |
4322 | goto error; | |
4323 | } | |
273ea72c | 4324 | |
ef367a93 JG |
4325 | ret = sem_post(&load_info->message_thread_ready); |
4326 | if (ret) { | |
4327 | PERROR("sem_post message_thread_ready"); | |
4328 | goto error; | |
4329 | } | |
0bb7724a | 4330 | |
25258405 JG |
4331 | /* |
4332 | * Wait until all support threads are initialized before accepting | |
4333 | * commands. | |
4334 | */ | |
4335 | while (uatomic_read(<tng_sessiond_ready) != 0) { | |
4336 | fd_set read_fds; | |
4337 | struct timeval timeout; | |
4338 | ||
4339 | FD_ZERO(&read_fds); | |
4340 | FD_SET(thread_quit_pipe[0], &read_fds); | |
4341 | memset(&timeout, 0, sizeof(timeout)); | |
4342 | timeout.tv_usec = 1000; | |
4343 | ||
4344 | /* | |
4345 | * If a support thread failed to launch, it may signal that | |
4346 | * we must exit and the sessiond would never be marked as | |
4347 | * "ready". | |
4348 | * | |
4349 | * The timeout is set to 1ms, which serves as a way to | |
4350 | * pace down this check. | |
4351 | */ | |
4352 | ret = select(thread_quit_pipe[0] + 1, &read_fds, NULL, NULL, | |
4353 | &timeout); | |
4354 | if (ret > 0 || (ret < 0 && errno != EINTR)) { | |
4355 | goto exit; | |
4356 | } | |
4357 | } | |
37317960 JG |
4358 | /* |
4359 | * This barrier is paired with the one in sessiond_notify_ready() to | |
4360 | * ensure that loads accessing data initialized by the other threads, | |
4361 | * on which this thread was waiting, are not performed before this point. | |
4362 | * | |
4363 | * Note that this could be a 'read' memory barrier, but a full barrier | |
4364 | * is used in case the code changes. The performance implications of | |
4365 | * this choice are minimal since this is a slow path. | |
4366 | */ | |
4367 | cmm_smp_mb(); | |
25258405 | 4368 | |
72453c8c MD |
4369 | /* This testpoint is after we signal readiness to the parent. */ |
4370 | if (testpoint(sessiond_thread_manage_clients)) { | |
4371 | goto error; | |
4372 | } | |
4373 | ||
e547b070 | 4374 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
4375 | goto error; |
4376 | } | |
8ac94142 | 4377 | |
840cb59c | 4378 | health_code_update(); |
44a5e5eb | 4379 | |
1d4b027a | 4380 | while (1) { |
1d4b027a | 4381 | DBG("Accepting client command ..."); |
273ea72c DG |
4382 | |
4383 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 4384 | restart: |
a78af745 | 4385 | health_poll_entry(); |
5eb91c98 | 4386 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 4387 | health_poll_exit(); |
273ea72c | 4388 | if (ret < 0) { |
88f2b785 MD |
4389 | /* |
4390 | * Restart interrupted system call. | |
4391 | */ | |
4392 | if (errno == EINTR) { | |
4393 | goto restart; | |
4394 | } | |
273ea72c DG |
4395 | goto error; |
4396 | } | |
4397 | ||
0d9c5d77 DG |
4398 | nb_fd = ret; |
4399 | ||
5eb91c98 DG |
4400 | for (i = 0; i < nb_fd; i++) { |
4401 | /* Fetch once the poll data */ | |
4402 | revents = LTTNG_POLL_GETEV(&events, i); | |
4403 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4404 | ||
840cb59c | 4405 | health_code_update(); |
44a5e5eb | 4406 | |
fd20dac9 MD |
4407 | if (!revents) { |
4408 | /* No activity for this FD (poll implementation). */ | |
4409 | continue; | |
4410 | } | |
4411 | ||
5eb91c98 | 4412 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4413 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 4414 | if (ret) { |
139ac872 MD |
4415 | err = 0; |
4416 | goto exit; | |
5eb91c98 DG |
4417 | } |
4418 | ||
4419 | /* Event on the registration socket */ | |
4420 | if (pollfd == client_sock) { | |
03e43155 MD |
4421 | if (revents & LPOLLIN) { |
4422 | continue; | |
4423 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
5eb91c98 DG |
4424 | ERR("Client socket poll error"); |
4425 | goto error; | |
03e43155 MD |
4426 | } else { |
4427 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4428 | goto error; | |
5eb91c98 DG |
4429 | } |
4430 | } | |
4431 | } | |
4432 | ||
4433 | DBG("Wait for client response"); | |
4434 | ||
840cb59c | 4435 | health_code_update(); |
44a5e5eb | 4436 | |
5eb91c98 DG |
4437 | sock = lttcomm_accept_unix_sock(client_sock); |
4438 | if (sock < 0) { | |
273ea72c | 4439 | goto error; |
273ea72c DG |
4440 | } |
4441 | ||
b662582b DG |
4442 | /* |
4443 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4444 | * show must go on. | |
4445 | */ | |
4446 | (void) utils_set_fd_cloexec(sock); | |
4447 | ||
be040666 DG |
4448 | /* Set socket option for credentials retrieval */ |
4449 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4450 | if (ret < 0) { | |
4451 | goto error; | |
4452 | } | |
4453 | ||
5eb91c98 | 4454 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4455 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4456 | if (cmd_ctx == NULL) { |
76d7553f | 4457 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4458 | goto error; |
5eb91c98 | 4459 | } |
1d4b027a | 4460 | |
5eb91c98 | 4461 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4462 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4463 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4464 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4465 | goto error; |
4466 | } | |
1d4b027a | 4467 | |
5eb91c98 DG |
4468 | cmd_ctx->llm = NULL; |
4469 | cmd_ctx->session = NULL; | |
1d4b027a | 4470 | |
840cb59c | 4471 | health_code_update(); |
44a5e5eb | 4472 | |
5eb91c98 DG |
4473 | /* |
4474 | * Data is received from the lttng client. The struct | |
4475 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4476 | * the client. | |
4477 | */ | |
4478 | DBG("Receiving data from client ..."); | |
be040666 DG |
4479 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4480 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4481 | if (ret <= 0) { |
4482 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4483 | ret = close(sock); |
4484 | if (ret) { | |
4485 | PERROR("close"); | |
4486 | } | |
4487 | sock = -1; | |
a2c0da86 | 4488 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4489 | continue; |
4490 | } | |
1d4b027a | 4491 | |
840cb59c | 4492 | health_code_update(); |
44a5e5eb | 4493 | |
5eb91c98 DG |
4494 | // TODO: Validate cmd_ctx including sanity check for |
4495 | // security purpose. | |
f7776ea7 | 4496 | |
f6a9efaa | 4497 | rcu_thread_online(); |
5eb91c98 DG |
4498 | /* |
4499 | * This function dispatch the work to the kernel or userspace tracer | |
4500 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4501 | * informations for the client. The command context struct contains | |
4502 | * everything this function may needs. | |
4503 | */ | |
53a80697 | 4504 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4505 | rcu_thread_offline(); |
5eb91c98 | 4506 | if (ret < 0) { |
36134aa1 DG |
4507 | ret = close(sock); |
4508 | if (ret) { | |
4509 | PERROR("close"); | |
53a80697 | 4510 | } |
36134aa1 | 4511 | sock = -1; |
bbd973c2 | 4512 | /* |
5eb91c98 | 4513 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4514 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4515 | * (ENOMEM). Error detected but still accept |
4516 | * command, unless a socket error has been | |
4517 | * detected. | |
bbd973c2 | 4518 | */ |
bbd973c2 | 4519 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4520 | continue; |
4521 | } | |
d6e4fca4 | 4522 | |
840cb59c | 4523 | health_code_update(); |
44a5e5eb | 4524 | |
a1ac8b97 | 4525 | DBG("Sending response (size: %d, retcode: %s (%d))", |
54d01ffb | 4526 | cmd_ctx->lttng_msg_size, |
a1ac8b97 JG |
4527 | lttng_strerror(-cmd_ctx->llm->ret_code), |
4528 | cmd_ctx->llm->ret_code); | |
54d01ffb | 4529 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4530 | if (ret < 0) { |
4531 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4532 | } |
1d4b027a | 4533 | |
5eb91c98 | 4534 | /* End of transmission */ |
76d7553f MD |
4535 | ret = close(sock); |
4536 | if (ret) { | |
4537 | PERROR("close"); | |
4538 | } | |
4539 | sock = -1; | |
be040666 DG |
4540 | |
4541 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4542 | |
840cb59c | 4543 | health_code_update(); |
273ea72c DG |
4544 | } |
4545 | ||
139ac872 | 4546 | exit: |
5eb91c98 | 4547 | error: |
35df2755 CB |
4548 | if (sock >= 0) { |
4549 | ret = close(sock); | |
4550 | if (ret) { | |
4551 | PERROR("close"); | |
4552 | } | |
139ac872 | 4553 | } |
44a5e5eb | 4554 | |
35df2755 CB |
4555 | lttng_poll_clean(&events); |
4556 | clean_command_ctx(&cmd_ctx); | |
4557 | ||
4558 | error_listen: | |
4559 | error_create_poll: | |
87c3f04b | 4560 | unlink(config.client_unix_sock_path.value); |
76d7553f MD |
4561 | if (client_sock >= 0) { |
4562 | ret = close(client_sock); | |
4563 | if (ret) { | |
4564 | PERROR("close"); | |
4565 | } | |
a4b35e07 | 4566 | } |
35df2755 CB |
4567 | |
4568 | if (err) { | |
840cb59c | 4569 | health_error(); |
35df2755 | 4570 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4571 | } |
273ea72c | 4572 | |
8782cc74 | 4573 | health_unregister(health_sessiond); |
35df2755 CB |
4574 | |
4575 | DBG("Client thread dying"); | |
f6a9efaa DG |
4576 | |
4577 | rcu_unregister_thread(); | |
4a15001e MD |
4578 | |
4579 | /* | |
4580 | * Since we are creating the consumer threads, we own them, so we need | |
4581 | * to join them before our thread exits. | |
4582 | */ | |
4583 | ret = join_consumer_thread(&kconsumer_data); | |
4584 | if (ret) { | |
4585 | errno = ret; | |
4586 | PERROR("join_consumer"); | |
4587 | } | |
4588 | ||
4589 | ret = join_consumer_thread(&ustconsumer32_data); | |
4590 | if (ret) { | |
4591 | errno = ret; | |
4592 | PERROR("join_consumer ust32"); | |
4593 | } | |
4594 | ||
4595 | ret = join_consumer_thread(&ustconsumer64_data); | |
4596 | if (ret) { | |
4597 | errno = ret; | |
4598 | PERROR("join_consumer ust64"); | |
4599 | } | |
1d4b027a DG |
4600 | return NULL; |
4601 | } | |
4602 | ||
c0232ea5 JG |
4603 | static int string_match(const char *str1, const char *str2) |
4604 | { | |
4605 | return (str1 && str2) && !strcmp(str1, str2); | |
4606 | } | |
4607 | ||
fac6795d | 4608 | /* |
26296c48 JG |
4609 | * Take an option from the getopt output and set it in the right variable to be |
4610 | * used later. | |
4611 | * | |
4612 | * Return 0 on success else a negative value. | |
fac6795d | 4613 | */ |
26296c48 | 4614 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4615 | { |
26296c48 | 4616 | int ret = 0; |
fac6795d | 4617 | |
c0232ea5 | 4618 | if (string_match(optname, "client-sock") || opt == 'c') { |
66b2ce8e JG |
4619 | if (!arg || *arg == '\0') { |
4620 | ret = -EINVAL; | |
4621 | goto end; | |
4622 | } | |
e8fa9fb0 MD |
4623 | if (lttng_is_setuid_setgid()) { |
4624 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4625 | "-c, --client-sock"); | |
4626 | } else { | |
87c3f04b JG |
4627 | config_string_set(&config.client_unix_sock_path, |
4628 | strdup(arg)); | |
4629 | if (!config.client_unix_sock_path.value) { | |
4630 | ret = -ENOMEM; | |
4631 | PERROR("strdup"); | |
4632 | } | |
e8fa9fb0 | 4633 | } |
c0232ea5 | 4634 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
66b2ce8e JG |
4635 | if (!arg || *arg == '\0') { |
4636 | ret = -EINVAL; | |
4637 | goto end; | |
4638 | } | |
e8fa9fb0 MD |
4639 | if (lttng_is_setuid_setgid()) { |
4640 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4641 | "-a, --apps-sock"); | |
4642 | } else { | |
87c3f04b JG |
4643 | config_string_set(&config.apps_unix_sock_path, |
4644 | strdup(arg)); | |
4645 | if (!config.apps_unix_sock_path.value) { | |
4646 | ret = -ENOMEM; | |
4647 | PERROR("strdup"); | |
4648 | } | |
e8fa9fb0 | 4649 | } |
c0232ea5 | 4650 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
87c3f04b | 4651 | config.daemonize = true; |
c0232ea5 | 4652 | } else if (string_match(optname, "background") || opt == 'b') { |
87c3f04b | 4653 | config.background = true; |
c0232ea5 | 4654 | } else if (string_match(optname, "group") || opt == 'g') { |
66b2ce8e JG |
4655 | if (!arg || *arg == '\0') { |
4656 | ret = -EINVAL; | |
4657 | goto end; | |
4658 | } | |
e8fa9fb0 MD |
4659 | if (lttng_is_setuid_setgid()) { |
4660 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4661 | "-g, --group"); | |
4662 | } else { | |
87c3f04b JG |
4663 | config_string_set(&config.tracing_group_name, |
4664 | strdup(arg)); | |
4665 | if (!config.tracing_group_name.value) { | |
e8fa9fb0 | 4666 | ret = -ENOMEM; |
87c3f04b | 4667 | PERROR("strdup"); |
e8fa9fb0 | 4668 | } |
db322c4d | 4669 | } |
c0232ea5 | 4670 | } else if (string_match(optname, "help") || opt == 'h') { |
4fc83d94 | 4671 | ret = utils_show_help(8, "lttng-sessiond", help_msg); |
8190767e | 4672 | if (ret) { |
4fc83d94 | 4673 | ERR("Cannot show --help for `lttng-sessiond`"); |
8190767e PP |
4674 | perror("exec"); |
4675 | } | |
4676 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
c0232ea5 | 4677 | } else if (string_match(optname, "version") || opt == 'V') { |
26296c48 JG |
4678 | fprintf(stdout, "%s\n", VERSION); |
4679 | exit(EXIT_SUCCESS); | |
c0232ea5 | 4680 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
87c3f04b | 4681 | config.sig_parent = true; |
c0232ea5 | 4682 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
66b2ce8e JG |
4683 | if (!arg || *arg == '\0') { |
4684 | ret = -EINVAL; | |
4685 | goto end; | |
4686 | } | |
e8fa9fb0 MD |
4687 | if (lttng_is_setuid_setgid()) { |
4688 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4689 | "--kconsumerd-err-sock"); | |
4690 | } else { | |
87c3f04b JG |
4691 | config_string_set(&config.kconsumerd_err_unix_sock_path, |
4692 | strdup(arg)); | |
4693 | if (!config.kconsumerd_err_unix_sock_path.value) { | |
4694 | ret = -ENOMEM; | |
4695 | PERROR("strdup"); | |
4696 | } | |
e8fa9fb0 | 4697 | } |
c0232ea5 | 4698 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
66b2ce8e JG |
4699 | if (!arg || *arg == '\0') { |
4700 | ret = -EINVAL; | |
4701 | goto end; | |
4702 | } | |
e8fa9fb0 MD |
4703 | if (lttng_is_setuid_setgid()) { |
4704 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4705 | "--kconsumerd-cmd-sock"); | |
4706 | } else { | |
87c3f04b JG |
4707 | config_string_set(&config.kconsumerd_cmd_unix_sock_path, |
4708 | strdup(arg)); | |
4709 | if (!config.kconsumerd_cmd_unix_sock_path.value) { | |
4710 | ret = -ENOMEM; | |
4711 | PERROR("strdup"); | |
4712 | } | |
e8fa9fb0 | 4713 | } |
c0232ea5 | 4714 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
66b2ce8e JG |
4715 | if (!arg || *arg == '\0') { |
4716 | ret = -EINVAL; | |
4717 | goto end; | |
4718 | } | |
e8fa9fb0 MD |
4719 | if (lttng_is_setuid_setgid()) { |
4720 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4721 | "--ustconsumerd64-err-sock"); | |
4722 | } else { | |
87c3f04b JG |
4723 | config_string_set(&config.consumerd64_err_unix_sock_path, |
4724 | strdup(arg)); | |
4725 | if (!config.consumerd64_err_unix_sock_path.value) { | |
4726 | ret = -ENOMEM; | |
4727 | PERROR("strdup"); | |
4728 | } | |
e8fa9fb0 | 4729 | } |
c0232ea5 | 4730 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
66b2ce8e JG |
4731 | if (!arg || *arg == '\0') { |
4732 | ret = -EINVAL; | |
4733 | goto end; | |
4734 | } | |
e8fa9fb0 MD |
4735 | if (lttng_is_setuid_setgid()) { |
4736 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4737 | "--ustconsumerd64-cmd-sock"); | |
4738 | } else { | |
87c3f04b JG |
4739 | config_string_set(&config.consumerd64_cmd_unix_sock_path, |
4740 | strdup(arg)); | |
4741 | if (!config.consumerd64_cmd_unix_sock_path.value) { | |
4742 | ret = -ENOMEM; | |
4743 | PERROR("strdup"); | |
4744 | } | |
e8fa9fb0 | 4745 | } |
c0232ea5 | 4746 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
66b2ce8e JG |
4747 | if (!arg || *arg == '\0') { |
4748 | ret = -EINVAL; | |
4749 | goto end; | |
4750 | } | |
e8fa9fb0 MD |
4751 | if (lttng_is_setuid_setgid()) { |
4752 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4753 | "--ustconsumerd32-err-sock"); | |
4754 | } else { | |
87c3f04b JG |
4755 | config_string_set(&config.consumerd32_err_unix_sock_path, |
4756 | strdup(arg)); | |
4757 | if (!config.consumerd32_err_unix_sock_path.value) { | |
4758 | ret = -ENOMEM; | |
4759 | PERROR("strdup"); | |
4760 | } | |
e8fa9fb0 | 4761 | } |
c0232ea5 | 4762 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
66b2ce8e JG |
4763 | if (!arg || *arg == '\0') { |
4764 | ret = -EINVAL; | |
4765 | goto end; | |
4766 | } | |
e8fa9fb0 MD |
4767 | if (lttng_is_setuid_setgid()) { |
4768 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4769 | "--ustconsumerd32-cmd-sock"); | |
4770 | } else { | |
87c3f04b JG |
4771 | config_string_set(&config.consumerd32_cmd_unix_sock_path, |
4772 | strdup(arg)); | |
4773 | if (!config.consumerd32_cmd_unix_sock_path.value) { | |
4774 | ret = -ENOMEM; | |
4775 | PERROR("strdup"); | |
4776 | } | |
e8fa9fb0 | 4777 | } |
c0232ea5 | 4778 | } else if (string_match(optname, "no-kernel")) { |
87c3f04b | 4779 | config.no_kernel = true; |
c0232ea5 | 4780 | } else if (string_match(optname, "quiet") || opt == 'q') { |
e1ccb989 | 4781 | config.quiet = true; |
c0232ea5 | 4782 | } else if (string_match(optname, "verbose") || opt == 'v') { |
26296c48 JG |
4783 | /* Verbose level can increase using multiple -v */ |
4784 | if (arg) { | |
13755a18 | 4785 | /* Value obtained from config file */ |
87c3f04b | 4786 | config.verbose = config_parse_value(arg); |
26296c48 | 4787 | } else { |
13755a18 | 4788 | /* -v used on command line */ |
87c3f04b | 4789 | config.verbose++; |
26296c48 | 4790 | } |
13755a18 | 4791 | /* Clamp value to [0, 3] */ |
87c3f04b JG |
4792 | config.verbose = config.verbose < 0 ? 0 : |
4793 | (config.verbose <= 3 ? config.verbose : 3); | |
c0232ea5 | 4794 | } else if (string_match(optname, "verbose-consumer")) { |
26296c48 | 4795 | if (arg) { |
87c3f04b | 4796 | config.verbose_consumer = config_parse_value(arg); |
26296c48 | 4797 | } else { |
87c3f04b | 4798 | config.verbose_consumer++; |
26296c48 | 4799 | } |
c0232ea5 | 4800 | } else if (string_match(optname, "consumerd32-path")) { |
66b2ce8e JG |
4801 | if (!arg || *arg == '\0') { |
4802 | ret = -EINVAL; | |
4803 | goto end; | |
4804 | } | |
e8fa9fb0 MD |
4805 | if (lttng_is_setuid_setgid()) { |
4806 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4807 | "--consumerd32-path"); | |
4808 | } else { | |
87c3f04b JG |
4809 | config_string_set(&config.consumerd32_bin_path, |
4810 | strdup(arg)); | |
4811 | if (!config.consumerd32_bin_path.value) { | |
e8fa9fb0 MD |
4812 | PERROR("strdup"); |
4813 | ret = -ENOMEM; | |
4814 | } | |
db322c4d | 4815 | } |
c0232ea5 | 4816 | } else if (string_match(optname, "consumerd32-libdir")) { |
66b2ce8e JG |
4817 | if (!arg || *arg == '\0') { |
4818 | ret = -EINVAL; | |
4819 | goto end; | |
4820 | } | |
e8fa9fb0 MD |
4821 | if (lttng_is_setuid_setgid()) { |
4822 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4823 | "--consumerd32-libdir"); | |
4824 | } else { | |
87c3f04b JG |
4825 | config_string_set(&config.consumerd32_lib_dir, |
4826 | strdup(arg)); | |
4827 | if (!config.consumerd32_lib_dir.value) { | |
e8fa9fb0 MD |
4828 | PERROR("strdup"); |
4829 | ret = -ENOMEM; | |
4830 | } | |
db322c4d | 4831 | } |
c0232ea5 | 4832 | } else if (string_match(optname, "consumerd64-path")) { |
66b2ce8e JG |
4833 | if (!arg || *arg == '\0') { |
4834 | ret = -EINVAL; | |
4835 | goto end; | |
4836 | } | |
e8fa9fb0 MD |
4837 | if (lttng_is_setuid_setgid()) { |
4838 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4839 | "--consumerd64-path"); | |
4840 | } else { | |
87c3f04b JG |
4841 | config_string_set(&config.consumerd64_bin_path, |
4842 | strdup(arg)); | |
4843 | if (!config.consumerd64_bin_path.value) { | |
e8fa9fb0 MD |
4844 | PERROR("strdup"); |
4845 | ret = -ENOMEM; | |
4846 | } | |
db322c4d | 4847 | } |
c0232ea5 | 4848 | } else if (string_match(optname, "consumerd64-libdir")) { |
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 | "--consumerd64-libdir"); | |
4856 | } else { | |
87c3f04b JG |
4857 | config_string_set(&config.consumerd64_lib_dir, |
4858 | strdup(arg)); | |
4859 | if (!config.consumerd64_lib_dir.value) { | |
e8fa9fb0 MD |
4860 | PERROR("strdup"); |
4861 | ret = -ENOMEM; | |
4862 | } | |
db322c4d | 4863 | } |
c0232ea5 | 4864 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
66b2ce8e JG |
4865 | if (!arg || *arg == '\0') { |
4866 | ret = -EINVAL; | |
4867 | goto end; | |
4868 | } | |
e8fa9fb0 MD |
4869 | if (lttng_is_setuid_setgid()) { |
4870 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4871 | "-p, --pidfile"); | |
4872 | } else { | |
87c3f04b JG |
4873 | config_string_set(&config.pid_file_path, strdup(arg)); |
4874 | if (!config.pid_file_path.value) { | |
e8fa9fb0 MD |
4875 | PERROR("strdup"); |
4876 | ret = -ENOMEM; | |
4877 | } | |
db322c4d | 4878 | } |
c0232ea5 | 4879 | } else if (string_match(optname, "agent-tcp-port")) { |
66b2ce8e JG |
4880 | if (!arg || *arg == '\0') { |
4881 | ret = -EINVAL; | |
4882 | goto end; | |
4883 | } | |
e8fa9fb0 MD |
4884 | if (lttng_is_setuid_setgid()) { |
4885 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4886 | "--agent-tcp-port"); | |
4887 | } else { | |
4888 | unsigned long v; | |
4d076222 | 4889 | |
e8fa9fb0 MD |
4890 | errno = 0; |
4891 | v = strtoul(arg, NULL, 0); | |
4892 | if (errno != 0 || !isdigit(arg[0])) { | |
4893 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); | |
4894 | return -1; | |
4895 | } | |
4896 | if (v == 0 || v >= 65535) { | |
4897 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); | |
4898 | return -1; | |
4899 | } | |
e6c533d6 JG |
4900 | config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v; |
4901 | DBG3("Agent TCP port set to non default: %i", (int) v); | |
26296c48 | 4902 | } |
c0232ea5 | 4903 | } else if (string_match(optname, "load") || opt == 'l') { |
66b2ce8e JG |
4904 | if (!arg || *arg == '\0') { |
4905 | ret = -EINVAL; | |
4906 | goto end; | |
4907 | } | |
e8fa9fb0 MD |
4908 | if (lttng_is_setuid_setgid()) { |
4909 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4910 | "-l, --load"); | |
4911 | } else { | |
87c3f04b JG |
4912 | config_string_set(&config.load_session_path, strdup(arg)); |
4913 | if (!config.load_session_path.value) { | |
e8fa9fb0 MD |
4914 | PERROR("strdup"); |
4915 | ret = -ENOMEM; | |
4916 | } | |
ef367a93 | 4917 | } |
c0232ea5 | 4918 | } else if (string_match(optname, "kmod-probes")) { |
66b2ce8e JG |
4919 | if (!arg || *arg == '\0') { |
4920 | ret = -EINVAL; | |
4921 | goto end; | |
4922 | } | |
e8fa9fb0 MD |
4923 | if (lttng_is_setuid_setgid()) { |
4924 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4925 | "--kmod-probes"); | |
4926 | } else { | |
87c3f04b JG |
4927 | config_string_set(&config.kmod_probes_list, strdup(arg)); |
4928 | if (!config.kmod_probes_list.value) { | |
e8fa9fb0 MD |
4929 | PERROR("strdup"); |
4930 | ret = -ENOMEM; | |
4931 | } | |
c9d42407 | 4932 | } |
c0232ea5 | 4933 | } else if (string_match(optname, "extra-kmod-probes")) { |
66b2ce8e JG |
4934 | if (!arg || *arg == '\0') { |
4935 | ret = -EINVAL; | |
4936 | goto end; | |
4937 | } | |
e8fa9fb0 MD |
4938 | if (lttng_is_setuid_setgid()) { |
4939 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4940 | "--extra-kmod-probes"); | |
4941 | } else { | |
87c3f04b JG |
4942 | config_string_set(&config.kmod_extra_probes_list, |
4943 | strdup(arg)); | |
4944 | if (!config.kmod_extra_probes_list.value) { | |
e8fa9fb0 MD |
4945 | PERROR("strdup"); |
4946 | ret = -ENOMEM; | |
4947 | } | |
db322c4d | 4948 | } |
c0232ea5 JG |
4949 | } else if (string_match(optname, "config") || opt == 'f') { |
4950 | /* This is handled in set_options() thus silent skip. */ | |
4951 | goto end; | |
4952 | } else { | |
26296c48 JG |
4953 | /* Unknown option or other error. |
4954 | * Error is printed by getopt, just return */ | |
4955 | ret = -1; | |
4956 | } | |
4957 | ||
f3dd7ce7 | 4958 | end: |
c5d350b2 JG |
4959 | if (ret == -EINVAL) { |
4960 | const char *opt_name = "unknown"; | |
4961 | int i; | |
4962 | ||
4963 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); | |
4964 | i++) { | |
4965 | if (opt == long_options[i].val) { | |
4966 | opt_name = long_options[i].name; | |
4967 | break; | |
4968 | } | |
4969 | } | |
4970 | ||
4971 | WARN("Invalid argument provided for option \"%s\", using default value.", | |
4972 | opt_name); | |
4973 | } | |
f3dd7ce7 | 4974 | |
26296c48 JG |
4975 | return ret; |
4976 | } | |
4977 | ||
4978 | /* | |
4979 | * config_entry_handler_cb used to handle options read from a config file. | |
f40ef1d5 | 4980 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
26296c48 JG |
4981 | * return value conventions. |
4982 | */ | |
4983 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
4984 | { | |
4985 | int ret = 0, i; | |
4986 | ||
4987 | if (!entry || !entry->name || !entry->value) { | |
4988 | ret = -EINVAL; | |
4989 | goto end; | |
4990 | } | |
4991 | ||
4992 | /* Check if the option is to be ignored */ | |
4993 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
4994 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
4995 | goto end; | |
4996 | } | |
4997 | } | |
4998 | ||
4999 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
5000 | i++) { | |
5001 | ||
5002 | /* Ignore if not fully matched. */ | |
5003 | if (strcmp(entry->name, long_options[i].name)) { | |
5004 | continue; | |
5005 | } | |
5006 | ||
5007 | /* | |
5008 | * If the option takes no argument on the command line, we have to | |
5009 | * check if the value is "true". We support non-zero numeric values, | |
5010 | * true, on and yes. | |
5011 | */ | |
5012 | if (!long_options[i].has_arg) { | |
5013 | ret = config_parse_value(entry->value); | |
5014 | if (ret <= 0) { | |
5015 | if (ret) { | |
5016 | WARN("Invalid configuration value \"%s\" for option %s", | |
5017 | entry->value, entry->name); | |
5018 | } | |
5019 | /* False, skip boolean config option. */ | |
5020 | goto end; | |
4d076222 | 5021 | } |
26296c48 JG |
5022 | } |
5023 | ||
5024 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
5025 | goto end; | |
5026 | } | |
5027 | ||
5028 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
5029 | ||
5030 | end: | |
5031 | return ret; | |
5032 | } | |
5033 | ||
5034 | /* | |
5035 | * daemon configuration loading and argument parsing | |
5036 | */ | |
5037 | static int set_options(int argc, char **argv) | |
5038 | { | |
5039 | int ret = 0, c = 0, option_index = 0; | |
5040 | int orig_optopt = optopt, orig_optind = optind; | |
5041 | char *optstring; | |
5042 | const char *config_path = NULL; | |
5043 | ||
5044 | optstring = utils_generate_optstring(long_options, | |
5045 | sizeof(long_options) / sizeof(struct option)); | |
5046 | if (!optstring) { | |
5047 | ret = -ENOMEM; | |
5048 | goto end; | |
5049 | } | |
5050 | ||
5051 | /* Check for the --config option */ | |
5052 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
5053 | &option_index)) != -1) { | |
5054 | if (c == '?') { | |
5055 | ret = -EINVAL; | |
5056 | goto end; | |
5057 | } else if (c != 'f') { | |
5058 | /* if not equal to --config option. */ | |
5059 | continue; | |
5060 | } | |
5061 | ||
e8fa9fb0 MD |
5062 | if (lttng_is_setuid_setgid()) { |
5063 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5064 | "-f, --config"); | |
5065 | } else { | |
5066 | config_path = utils_expand_path(optarg); | |
5067 | if (!config_path) { | |
5068 | ERR("Failed to resolve path: %s", optarg); | |
5069 | } | |
26296c48 JG |
5070 | } |
5071 | } | |
5072 | ||
5073 | ret = config_get_section_entries(config_path, config_section_name, | |
5074 | config_entry_handler, NULL); | |
5075 | if (ret) { | |
5076 | if (ret > 0) { | |
5077 | ERR("Invalid configuration option at line %i", ret); | |
5078 | ret = -1; | |
5079 | } | |
5080 | goto end; | |
5081 | } | |
5082 | ||
5083 | /* Reset getopt's global state */ | |
5084 | optopt = orig_optopt; | |
5085 | optind = orig_optind; | |
5086 | while (1) { | |
c0232ea5 JG |
5087 | option_index = -1; |
5088 | /* | |
5089 | * getopt_long() will not set option_index if it encounters a | |
5090 | * short option. | |
5091 | */ | |
5092 | c = getopt_long(argc, argv, optstring, long_options, | |
5093 | &option_index); | |
26296c48 | 5094 | if (c == -1) { |
4d076222 DG |
5095 | break; |
5096 | } | |
26296c48 | 5097 | |
c0232ea5 JG |
5098 | /* |
5099 | * Pass NULL as the long option name if popt left the index | |
5100 | * unset. | |
5101 | */ | |
5102 | ret = set_option(c, optarg, | |
5103 | option_index < 0 ? NULL : | |
5104 | long_options[option_index].name); | |
26296c48 JG |
5105 | if (ret < 0) { |
5106 | break; | |
fac6795d DG |
5107 | } |
5108 | } | |
5109 | ||
26296c48 JG |
5110 | end: |
5111 | free(optstring); | |
5112 | return ret; | |
fac6795d DG |
5113 | } |
5114 | ||
5115 | /* | |
d063d709 | 5116 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
5117 | * apps_sock - The communication socket for all UST apps. |
5118 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 5119 | */ |
cf3af59e | 5120 | static int init_daemon_socket(void) |
fac6795d DG |
5121 | { |
5122 | int ret = 0; | |
5123 | mode_t old_umask; | |
5124 | ||
5125 | old_umask = umask(0); | |
5126 | ||
5127 | /* Create client tool unix socket */ | |
87c3f04b | 5128 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); |
d6f42150 | 5129 | if (client_sock < 0) { |
87c3f04b | 5130 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); |
fac6795d DG |
5131 | ret = -1; |
5132 | goto end; | |
5133 | } | |
5134 | ||
b662582b DG |
5135 | /* Set the cloexec flag */ |
5136 | ret = utils_set_fd_cloexec(client_sock); | |
5137 | if (ret < 0) { | |
5138 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
5139 | "Continuing but note that the consumer daemon will have a " | |
5140 | "reference to this socket on exec()", client_sock); | |
5141 | } | |
5142 | ||
fac6795d | 5143 | /* File permission MUST be 660 */ |
87c3f04b | 5144 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
fac6795d | 5145 | if (ret < 0) { |
87c3f04b | 5146 | ERR("Set file permissions failed: %s", config.client_unix_sock_path.value); |
76d7553f | 5147 | PERROR("chmod"); |
fac6795d DG |
5148 | goto end; |
5149 | } | |
5150 | ||
5151 | /* Create the application unix socket */ | |
87c3f04b | 5152 | apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value); |
d6f42150 | 5153 | if (apps_sock < 0) { |
87c3f04b | 5154 | ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value); |
fac6795d DG |
5155 | ret = -1; |
5156 | goto end; | |
5157 | } | |
5158 | ||
b662582b DG |
5159 | /* Set the cloexec flag */ |
5160 | ret = utils_set_fd_cloexec(apps_sock); | |
5161 | if (ret < 0) { | |
5162 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
5163 | "Continuing but note that the consumer daemon will have a " | |
5164 | "reference to this socket on exec()", apps_sock); | |
5165 | } | |
5166 | ||
d6f42150 | 5167 | /* File permission MUST be 666 */ |
87c3f04b | 5168 | ret = chmod(config.apps_unix_sock_path.value, |
54d01ffb | 5169 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
fac6795d | 5170 | if (ret < 0) { |
87c3f04b | 5171 | ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value); |
76d7553f | 5172 | PERROR("chmod"); |
fac6795d DG |
5173 | goto end; |
5174 | } | |
5175 | ||
b662582b DG |
5176 | DBG3("Session daemon client socket %d and application socket %d created", |
5177 | client_sock, apps_sock); | |
5178 | ||
fac6795d DG |
5179 | end: |
5180 | umask(old_umask); | |
5181 | return ret; | |
5182 | } | |
5183 | ||
ac003230 JG |
5184 | /* |
5185 | * Create lockfile using the rundir and return its fd. | |
5186 | */ | |
5187 | static int create_lockfile(void) | |
5188 | { | |
5189 | return utils_create_lock_file(config.lock_file_path.value); | |
5190 | } | |
5191 | ||
fac6795d | 5192 | /* |
54d01ffb DG |
5193 | * Check if the global socket is available, and if a daemon is answering at the |
5194 | * other side. If yes, error is returned. | |
ac003230 JG |
5195 | * |
5196 | * Also attempts to create and hold the lock file. | |
fac6795d | 5197 | */ |
cf3af59e | 5198 | static int check_existing_daemon(void) |
fac6795d | 5199 | { |
ac003230 JG |
5200 | int ret = 0; |
5201 | ||
7d8234d9 | 5202 | /* Is there anybody out there ? */ |
099e26bd | 5203 | if (lttng_session_daemon_alive()) { |
ac003230 JG |
5204 | ret = -EEXIST; |
5205 | goto end; | |
099e26bd | 5206 | } |
b09c7c76 | 5207 | |
ac003230 JG |
5208 | lockfile_fd = create_lockfile(); |
5209 | if (lockfile_fd < 0) { | |
5210 | ret = -EEXIST; | |
5211 | goto end; | |
5212 | } | |
5213 | end: | |
5214 | return ret; | |
5215 | } | |
5216 | ||
5217 | static void sessiond_cleanup_lock_file(void) | |
5218 | { | |
5219 | int ret; | |
5220 | ||
5221 | /* | |
5222 | * Cleanup lock file by deleting it and finaly closing it which will | |
5223 | * release the file system lock. | |
5224 | */ | |
5225 | if (lockfile_fd >= 0) { | |
5226 | ret = remove(config.lock_file_path.value); | |
5227 | if (ret < 0) { | |
5228 | PERROR("remove lock file"); | |
5229 | } | |
5230 | ret = close(lockfile_fd); | |
5231 | if (ret < 0) { | |
5232 | PERROR("close lock file"); | |
5233 | } | |
5234 | } | |
fac6795d DG |
5235 | } |
5236 | ||
fac6795d | 5237 | /* |
d063d709 | 5238 | * Set the tracing group gid onto the client socket. |
5e16da05 | 5239 | * |
d063d709 | 5240 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 5241 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 5242 | */ |
be040666 | 5243 | static int set_permissions(char *rundir) |
fac6795d DG |
5244 | { |
5245 | int ret; | |
996b65c8 | 5246 | gid_t gid; |
fac6795d | 5247 | |
87c3f04b | 5248 | gid = utils_get_group_id(config.tracing_group_name.value); |
fac6795d | 5249 | |
d6f42150 | 5250 | /* Set lttng run dir */ |
be040666 | 5251 | ret = chown(rundir, 0, gid); |
d6f42150 | 5252 | if (ret < 0) { |
be040666 | 5253 | ERR("Unable to set group on %s", rundir); |
76d7553f | 5254 | PERROR("chown"); |
d6f42150 DG |
5255 | } |
5256 | ||
6c71277b MD |
5257 | /* |
5258 | * Ensure all applications and tracing group can search the run | |
5259 | * dir. Allow everyone to read the directory, since it does not | |
5260 | * buy us anything to hide its content. | |
5261 | */ | |
5262 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
5263 | if (ret < 0) { |
5264 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5265 | PERROR("chmod"); |
d1613cf5 JN |
5266 | } |
5267 | ||
d6f42150 | 5268 | /* lttng client socket path */ |
87c3f04b | 5269 | ret = chown(config.client_unix_sock_path.value, 0, gid); |
fac6795d | 5270 | if (ret < 0) { |
87c3f04b | 5271 | ERR("Unable to set group on %s", config.client_unix_sock_path.value); |
76d7553f | 5272 | PERROR("chown"); |
d6f42150 DG |
5273 | } |
5274 | ||
3bd1e081 | 5275 | /* kconsumer error socket path */ |
6c71277b | 5276 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 5277 | if (ret < 0) { |
3bd1e081 | 5278 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5279 | PERROR("chown"); |
3bd1e081 MD |
5280 | } |
5281 | ||
7753dea8 | 5282 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 5283 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
5284 | if (ret < 0) { |
5285 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5286 | PERROR("chown"); |
7753dea8 MD |
5287 | } |
5288 | ||
5289 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 5290 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 5291 | if (ret < 0) { |
7753dea8 | 5292 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5293 | PERROR("chown"); |
fac6795d DG |
5294 | } |
5295 | ||
d6f42150 | 5296 | DBG("All permissions are set"); |
e07ae692 | 5297 | |
fac6795d DG |
5298 | return ret; |
5299 | } | |
5300 | ||
d6f42150 | 5301 | /* |
d063d709 | 5302 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5303 | */ |
87c3f04b | 5304 | static int create_lttng_rundir(void) |
d6f42150 DG |
5305 | { |
5306 | int ret; | |
5307 | ||
87c3f04b | 5308 | DBG3("Creating LTTng run directory: %s", config.rundir.value); |
67e40797 | 5309 | |
87c3f04b | 5310 | ret = mkdir(config.rundir.value, S_IRWXU); |
d6f42150 | 5311 | if (ret < 0) { |
b1f11e69 | 5312 | if (errno != EEXIST) { |
87c3f04b | 5313 | ERR("Unable to create %s", config.rundir.value); |
b1f11e69 DG |
5314 | goto error; |
5315 | } else { | |
5316 | ret = 0; | |
5317 | } | |
d6f42150 DG |
5318 | } |
5319 | ||
5320 | error: | |
5321 | return ret; | |
5322 | } | |
5323 | ||
5324 | /* | |
87c3f04b | 5325 | * Setup sockets and directory needed by the consumerds' communication with the |
d063d709 | 5326 | * session daemon. |
d6f42150 | 5327 | */ |
87c3f04b | 5328 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
5329 | { |
5330 | int ret; | |
87c3f04b | 5331 | char *path = NULL; |
d6f42150 | 5332 | |
6c71277b | 5333 | switch (consumer_data->type) { |
7753dea8 | 5334 | case LTTNG_CONSUMER_KERNEL: |
87c3f04b | 5335 | path = config.kconsumerd_path.value; |
7753dea8 MD |
5336 | break; |
5337 | case LTTNG_CONSUMER64_UST: | |
87c3f04b | 5338 | path = config.consumerd64_path.value; |
7753dea8 MD |
5339 | break; |
5340 | case LTTNG_CONSUMER32_UST: | |
87c3f04b | 5341 | path = config.consumerd32_path.value; |
7753dea8 MD |
5342 | break; |
5343 | default: | |
5344 | ERR("Consumer type unknown"); | |
5345 | ret = -EINVAL; | |
5346 | goto error; | |
d6f42150 | 5347 | } |
87c3f04b | 5348 | assert(path); |
d6f42150 | 5349 | |
67e40797 DG |
5350 | DBG2("Creating consumer directory: %s", path); |
5351 | ||
6c71277b | 5352 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
513ae6a3 JR |
5353 | if (ret < 0 && errno != EEXIST) { |
5354 | PERROR("mkdir"); | |
5355 | ERR("Failed to create %s", path); | |
5356 | goto error; | |
d6f42150 | 5357 | } |
6c71277b | 5358 | if (is_root) { |
87c3f04b | 5359 | ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value)); |
6c71277b MD |
5360 | if (ret < 0) { |
5361 | ERR("Unable to set group on %s", path); | |
5362 | PERROR("chown"); | |
5363 | goto error; | |
5364 | } | |
5365 | } | |
d6f42150 | 5366 | |
87c3f04b | 5367 | /* Create the consumerd error unix socket */ |
3bd1e081 MD |
5368 | consumer_data->err_sock = |
5369 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5370 | if (consumer_data->err_sock < 0) { | |
5371 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5372 | ret = -1; |
5373 | goto error; | |
5374 | } | |
5375 | ||
a24f05ab MD |
5376 | /* |
5377 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
5378 | * show must go on. | |
5379 | */ | |
5380 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
5381 | if (ret < 0) { | |
5382 | PERROR("utils_set_fd_cloexec"); | |
5383 | /* continue anyway */ | |
5384 | } | |
5385 | ||
d6f42150 | 5386 | /* File permission MUST be 660 */ |
3bd1e081 | 5387 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5388 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5389 | if (ret < 0) { |
3bd1e081 | 5390 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5391 | PERROR("chmod"); |
d6f42150 DG |
5392 | goto error; |
5393 | } | |
5394 | ||
5395 | error: | |
5396 | return ret; | |
5397 | } | |
5398 | ||
fac6795d | 5399 | /* |
d063d709 | 5400 | * Signal handler for the daemon |
cf3af59e | 5401 | * |
54d01ffb DG |
5402 | * Simply stop all worker threads, leaving main() return gracefully after |
5403 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5404 | */ |
5405 | static void sighandler(int sig) | |
5406 | { | |
5407 | switch (sig) { | |
cf3af59e | 5408 | case SIGINT: |
af87c45a | 5409 | DBG("SIGINT caught"); |
cf3af59e MD |
5410 | stop_threads(); |
5411 | break; | |
5412 | case SIGTERM: | |
af87c45a | 5413 | DBG("SIGTERM caught"); |
cf3af59e MD |
5414 | stop_threads(); |
5415 | break; | |
0bb7724a DG |
5416 | case SIGUSR1: |
5417 | CMM_STORE_SHARED(recv_child_signal, 1); | |
5418 | break; | |
cf3af59e MD |
5419 | default: |
5420 | break; | |
fac6795d | 5421 | } |
fac6795d DG |
5422 | } |
5423 | ||
5424 | /* | |
d063d709 | 5425 | * Setup signal handler for : |
1d4b027a | 5426 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5427 | */ |
1d4b027a | 5428 | static int set_signal_handler(void) |
fac6795d | 5429 | { |
1d4b027a DG |
5430 | int ret = 0; |
5431 | struct sigaction sa; | |
5432 | sigset_t sigset; | |
fac6795d | 5433 | |
1d4b027a | 5434 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5435 | PERROR("sigemptyset"); |
1d4b027a DG |
5436 | return ret; |
5437 | } | |
d6f42150 | 5438 | |
1d4b027a DG |
5439 | sa.sa_mask = sigset; |
5440 | sa.sa_flags = 0; | |
0072e5e2 MD |
5441 | |
5442 | sa.sa_handler = sighandler; | |
1d4b027a | 5443 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
76d7553f | 5444 | PERROR("sigaction"); |
1d4b027a | 5445 | return ret; |
d6f42150 DG |
5446 | } |
5447 | ||
1d4b027a | 5448 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5449 | PERROR("sigaction"); |
1d4b027a | 5450 | return ret; |
d6f42150 | 5451 | } |
aaf26714 | 5452 | |
0072e5e2 | 5453 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
76d7553f | 5454 | PERROR("sigaction"); |
1d4b027a | 5455 | return ret; |
8c0faa1d DG |
5456 | } |
5457 | ||
0072e5e2 MD |
5458 | sa.sa_handler = SIG_IGN; |
5459 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
0bb7724a DG |
5460 | PERROR("sigaction"); |
5461 | return ret; | |
5462 | } | |
5463 | ||
5464 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
5465 | |
5466 | return ret; | |
fac6795d DG |
5467 | } |
5468 | ||
f3ed775e | 5469 | /* |
d063d709 | 5470 | * Set open files limit to unlimited. This daemon can open a large number of |
514bb9f0 | 5471 | * file descriptors in order to consume multiple kernel traces. |
f3ed775e DG |
5472 | */ |
5473 | static void set_ulimit(void) | |
5474 | { | |
5475 | int ret; | |
5476 | struct rlimit lim; | |
5477 | ||
514bb9f0 | 5478 | /* The kernel does not allow an infinite limit for open files */ |
f3ed775e DG |
5479 | lim.rlim_cur = 65535; |
5480 | lim.rlim_max = 65535; | |
5481 | ||
5482 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5483 | if (ret < 0) { | |
76d7553f | 5484 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5485 | } |
5486 | } | |
5487 | ||
4a15001e | 5488 | static int write_pidfile(void) |
35f90c40 | 5489 | { |
87c3f04b | 5490 | return utils_create_pid_file(getpid(), config.pid_file_path.value); |
35f90c40 DG |
5491 | } |
5492 | ||
87c3f04b JG |
5493 | static int set_clock_plugin_env(void) |
5494 | { | |
5495 | int ret = 0; | |
5496 | char *env_value = NULL; | |
cd9290dd | 5497 | |
87c3f04b JG |
5498 | if (!config.lttng_ust_clock_plugin.value) { |
5499 | goto end; | |
5500 | } | |
5501 | ||
5502 | ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", | |
5503 | config.lttng_ust_clock_plugin.value); | |
cd9290dd | 5504 | if (ret < 0) { |
87c3f04b JG |
5505 | PERROR("asprintf"); |
5506 | goto end; | |
cd9290dd DG |
5507 | } |
5508 | ||
87c3f04b JG |
5509 | ret = putenv(env_value); |
5510 | if (ret) { | |
5511 | free(env_value); | |
5512 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); | |
5513 | goto end; | |
5514 | } | |
cd9290dd | 5515 | |
87c3f04b JG |
5516 | DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"", |
5517 | config.lttng_ust_clock_plugin.value); | |
5518 | end: | |
4a15001e | 5519 | return ret; |
ef367a93 JG |
5520 | } |
5521 | ||
fac6795d DG |
5522 | /* |
5523 | * main | |
5524 | */ | |
5525 | int main(int argc, char **argv) | |
5526 | { | |
4a15001e | 5527 | int ret = 0, retval = 0; |
fac6795d | 5528 | void *status; |
87c3f04b | 5529 | const char *env_app_timeout; |
b3530820 JG |
5530 | struct lttng_pipe *ust32_channel_monitor_pipe = NULL, |
5531 | *ust64_channel_monitor_pipe = NULL, | |
5532 | *kernel_channel_monitor_pipe = NULL; | |
0e1fc73c | 5533 | bool notification_thread_running = false; |
fac6795d | 5534 | |
335a95b7 MD |
5535 | init_kernel_workarounds(); |
5536 | ||
f6a9efaa DG |
5537 | rcu_register_thread(); |
5538 | ||
4a15001e MD |
5539 | if (set_signal_handler()) { |
5540 | retval = -1; | |
5541 | goto exit_set_signal_handler; | |
0bb7724a DG |
5542 | } |
5543 | ||
12744796 DG |
5544 | page_size = sysconf(_SC_PAGESIZE); |
5545 | if (page_size < 0) { | |
5546 | PERROR("sysconf _SC_PAGESIZE"); | |
5547 | page_size = LONG_MAX; | |
5548 | WARN("Fallback page size to %ld", page_size); | |
5549 | } | |
5550 | ||
87c3f04b JG |
5551 | ret = sessiond_config_init(&config); |
5552 | if (ret) { | |
5553 | retval = -1; | |
5554 | goto exit_set_signal_handler; | |
5555 | } | |
5556 | ||
56c17070 JR |
5557 | /* |
5558 | * Init config from environment variables. | |
5559 | * Command line option override env configuration per-doc. Do env first. | |
5560 | */ | |
5561 | sessiond_config_apply_env_config(&config); | |
5562 | ||
4a15001e MD |
5563 | /* |
5564 | * Parse arguments and load the daemon configuration file. | |
5565 | * | |
5566 | * We have an exit_options exit path to free memory reserved by | |
5567 | * set_options. This is needed because the rest of sessiond_cleanup() | |
5568 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which | |
5569 | * depends on set_options. | |
5570 | */ | |
fac6795d | 5571 | progname = argv[0]; |
4a15001e MD |
5572 | if (set_options(argc, argv)) { |
5573 | retval = -1; | |
5574 | goto exit_options; | |
fac6795d DG |
5575 | } |
5576 | ||
87c3f04b JG |
5577 | /* |
5578 | * Resolve all paths received as arguments, configuration option, or | |
5579 | * through environment variable as absolute paths. This is necessary | |
5580 | * since daemonizing causes the sessiond's current working directory | |
5581 | * to '/'. | |
5582 | */ | |
5583 | ret = sessiond_config_resolve_paths(&config); | |
5584 | if (ret) { | |
5585 | goto exit_options; | |
5586 | } | |
5587 | ||
5588 | /* Apply config. */ | |
5589 | lttng_opt_verbose = config.verbose; | |
5590 | lttng_opt_quiet = config.quiet; | |
5591 | kconsumer_data.err_unix_sock_path = | |
5592 | config.kconsumerd_err_unix_sock_path.value; | |
5593 | kconsumer_data.cmd_unix_sock_path = | |
5594 | config.kconsumerd_cmd_unix_sock_path.value; | |
5595 | ustconsumer32_data.err_unix_sock_path = | |
5596 | config.consumerd32_err_unix_sock_path.value; | |
5597 | ustconsumer32_data.cmd_unix_sock_path = | |
5598 | config.consumerd32_cmd_unix_sock_path.value; | |
5599 | ustconsumer64_data.err_unix_sock_path = | |
5600 | config.consumerd64_err_unix_sock_path.value; | |
5601 | ustconsumer64_data.cmd_unix_sock_path = | |
5602 | config.consumerd64_cmd_unix_sock_path.value; | |
5603 | set_clock_plugin_env(); | |
5604 | ||
5605 | sessiond_config_log(&config); | |
5606 | ||
ac003230 JG |
5607 | if (create_lttng_rundir()) { |
5608 | retval = -1; | |
5609 | goto exit_options; | |
5610 | } | |
5611 | ||
5612 | /* Abort launch if a session daemon is already running. */ | |
5613 | if (check_existing_daemon()) { | |
5614 | ERR("A session daemon is already running."); | |
5615 | retval = -1; | |
5616 | goto exit_options; | |
5617 | } | |
5618 | ||
fac6795d | 5619 | /* Daemonize */ |
87c3f04b | 5620 | if (config.daemonize || config.background) { |
ceed52b5 MD |
5621 | int i; |
5622 | ||
72dd7491 | 5623 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
87c3f04b | 5624 | !config.background); |
53094c05 | 5625 | if (ret < 0) { |
4a15001e MD |
5626 | retval = -1; |
5627 | goto exit_options; | |
53094c05 | 5628 | } |
0bb7724a | 5629 | |
ceed52b5 | 5630 | /* |
0bb7724a | 5631 | * We are in the child. Make sure all other file descriptors are |
4a15001e | 5632 | * closed, in case we are called with more opened file |
ac003230 | 5633 | * descriptors than the standard ones and the lock file. |
ceed52b5 MD |
5634 | */ |
5635 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
ac003230 JG |
5636 | if (i == lockfile_fd) { |
5637 | continue; | |
5638 | } | |
ceed52b5 MD |
5639 | (void) close(i); |
5640 | } | |
5641 | } | |
5642 | ||
7567352f MD |
5643 | if (run_as_create_worker(argv[0]) < 0) { |
5644 | goto exit_create_run_as_worker_cleanup; | |
5645 | } | |
5646 | ||
4a15001e MD |
5647 | /* |
5648 | * Starting from here, we can create threads. This needs to be after | |
5649 | * lttng_daemonize due to RCU. | |
5650 | */ | |
5651 | ||
5652 | /* | |
5653 | * Initialize the health check subsystem. This call should set the | |
5654 | * appropriate time values. | |
5655 | */ | |
5656 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); | |
5657 | if (!health_sessiond) { | |
5658 | PERROR("health_app_create error"); | |
5659 | retval = -1; | |
5660 | goto exit_health_sessiond_cleanup; | |
5661 | } | |
5662 | ||
4a15001e | 5663 | /* Create thread to clean up RCU hash tables */ |
5e97de00 | 5664 | if (init_ht_cleanup_thread(&ht_cleanup_thread)) { |
4a15001e MD |
5665 | retval = -1; |
5666 | goto exit_ht_cleanup; | |
5667 | } | |
5668 | ||
ceed52b5 | 5669 | /* Create thread quit pipe */ |
4a15001e MD |
5670 | if (init_thread_quit_pipe()) { |
5671 | retval = -1; | |
5672 | goto exit_init_data; | |
fac6795d DG |
5673 | } |
5674 | ||
5675 | /* Check if daemon is UID = 0 */ | |
5676 | is_root = !getuid(); | |
fac6795d | 5677 | if (is_root) { |
67e40797 | 5678 | /* Create global run dir with root access */ |
67e40797 | 5679 | |
b3530820 JG |
5680 | kernel_channel_monitor_pipe = lttng_pipe_open(0); |
5681 | if (!kernel_channel_monitor_pipe) { | |
5682 | ERR("Failed to create kernel consumer channel monitor pipe"); | |
5683 | retval = -1; | |
5684 | goto exit_init_data; | |
5685 | } | |
5686 | kconsumer_data.channel_monitor_pipe = | |
5687 | lttng_pipe_release_writefd( | |
5688 | kernel_channel_monitor_pipe); | |
5689 | if (kconsumer_data.channel_monitor_pipe < 0) { | |
5690 | retval = -1; | |
5691 | goto exit_init_data; | |
5692 | } | |
fac6795d DG |
5693 | } |
5694 | ||
5c827ce0 DG |
5695 | /* Set consumer initial state */ |
5696 | kernel_consumerd_state = CONSUMER_STOPPED; | |
5697 | ust_consumerd_state = CONSUMER_STOPPED; | |
5698 | ||
b3530820 JG |
5699 | ust32_channel_monitor_pipe = lttng_pipe_open(0); |
5700 | if (!ust32_channel_monitor_pipe) { | |
5701 | ERR("Failed to create 32-bit user space consumer channel monitor pipe"); | |
5702 | retval = -1; | |
5703 | goto exit_init_data; | |
5704 | } | |
5705 | ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
5706 | ust32_channel_monitor_pipe); | |
5707 | if (ustconsumer32_data.channel_monitor_pipe < 0) { | |
5708 | retval = -1; | |
5709 | goto exit_init_data; | |
5710 | } | |
67e40797 | 5711 | |
b3530820 JG |
5712 | ust64_channel_monitor_pipe = lttng_pipe_open(0); |
5713 | if (!ust64_channel_monitor_pipe) { | |
5714 | ERR("Failed to create 64-bit user space consumer channel monitor pipe"); | |
5715 | retval = -1; | |
5716 | goto exit_init_data; | |
5717 | } | |
5718 | ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
5719 | ust64_channel_monitor_pipe); | |
5720 | if (ustconsumer64_data.channel_monitor_pipe < 0) { | |
5721 | retval = -1; | |
5722 | goto exit_init_data; | |
5723 | } | |
847177cd | 5724 | |
1427f9b2 DG |
5725 | /* |
5726 | * Init UST app hash table. Alloc hash table before this point since | |
5727 | * cleanup() can get called after that point. | |
5728 | */ | |
4a15001e | 5729 | if (ust_app_ht_alloc()) { |
ddbeb0f6 | 5730 | ERR("Failed to allocate UST app hash table"); |
4a15001e MD |
5731 | retval = -1; |
5732 | goto exit_init_data; | |
5733 | } | |
1427f9b2 | 5734 | |
6a4e4039 JG |
5735 | /* |
5736 | * Initialize agent app hash table. We allocate the hash table here | |
5737 | * since cleanup() can get called after this point. | |
5738 | */ | |
5739 | if (agent_app_ht_alloc()) { | |
5740 | ERR("Failed to allocate Agent app hash table"); | |
4a15001e MD |
5741 | retval = -1; |
5742 | goto exit_init_data; | |
f20baf8e DG |
5743 | } |
5744 | ||
a88df331 DG |
5745 | /* |
5746 | * These actions must be executed as root. We do that *after* setting up | |
5747 | * the sockets path because we MUST make the check for another daemon using | |
5748 | * those paths *before* trying to set the kernel consumer sockets and init | |
5749 | * kernel tracer. | |
5750 | */ | |
5751 | if (is_root) { | |
87c3f04b | 5752 | if (set_consumer_sockets(&kconsumer_data)) { |
4a15001e MD |
5753 | retval = -1; |
5754 | goto exit_init_data; | |
7753dea8 MD |
5755 | } |
5756 | ||
a88df331 | 5757 | /* Setup kernel tracer */ |
87c3f04b | 5758 | if (!config.no_kernel) { |
4fba7219 | 5759 | init_kernel_tracer(); |
89588270 DG |
5760 | if (kernel_tracer_fd >= 0) { |
5761 | ret = syscall_init_table(); | |
5762 | if (ret < 0) { | |
4a15001e MD |
5763 | ERR("Unable to populate syscall table. " |
5764 | "Syscall tracing won't work " | |
5765 | "for this session daemon."); | |
89588270 | 5766 | } |
834978fd | 5767 | } |
4fba7219 | 5768 | } |
a88df331 DG |
5769 | |
5770 | /* Set ulimit for open files */ | |
5771 | set_ulimit(); | |
fac6795d | 5772 | } |
4063050c MD |
5773 | /* init lttng_fd tracking must be done after set_ulimit. */ |
5774 | lttng_fd_init(); | |
fac6795d | 5775 | |
87c3f04b | 5776 | if (set_consumer_sockets(&ustconsumer64_data)) { |
4a15001e MD |
5777 | retval = -1; |
5778 | goto exit_init_data; | |
67e40797 DG |
5779 | } |
5780 | ||
87c3f04b | 5781 | if (set_consumer_sockets(&ustconsumer32_data)) { |
4a15001e MD |
5782 | retval = -1; |
5783 | goto exit_init_data; | |
67e40797 DG |
5784 | } |
5785 | ||
d6f42150 | 5786 | /* Setup the needed unix socket */ |
4a15001e MD |
5787 | if (init_daemon_socket()) { |
5788 | retval = -1; | |
5789 | goto exit_init_data; | |
fac6795d DG |
5790 | } |
5791 | ||
5792 | /* Set credentials to socket */ | |
87c3f04b | 5793 | if (is_root && set_permissions(config.rundir.value)) { |
4a15001e MD |
5794 | retval = -1; |
5795 | goto exit_init_data; | |
fac6795d DG |
5796 | } |
5797 | ||
5b8719f5 | 5798 | /* Get parent pid if -S, --sig-parent is specified. */ |
87c3f04b | 5799 | if (config.sig_parent) { |
5b8719f5 DG |
5800 | ppid = getppid(); |
5801 | } | |
5802 | ||
7a485870 | 5803 | /* Setup the kernel pipe for waking up the kernel thread */ |
87c3f04b | 5804 | if (is_root && !config.no_kernel) { |
4a15001e MD |
5805 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
5806 | retval = -1; | |
5807 | goto exit_init_data; | |
6620da75 | 5808 | } |
7a485870 DG |
5809 | } |
5810 | ||
099e26bd | 5811 | /* Setup the thread apps communication pipe. */ |
4a15001e MD |
5812 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
5813 | retval = -1; | |
5814 | goto exit_init_data; | |
099e26bd DG |
5815 | } |
5816 | ||
d0b96690 | 5817 | /* Setup the thread apps notify communication pipe. */ |
4a15001e MD |
5818 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
5819 | retval = -1; | |
5820 | goto exit_init_data; | |
d0b96690 DG |
5821 | } |
5822 | ||
7972aab2 DG |
5823 | /* Initialize global buffer per UID and PID registry. */ |
5824 | buffer_reg_init_uid_registry(); | |
5825 | buffer_reg_init_pid_registry(); | |
5826 | ||
099e26bd | 5827 | /* Init UST command queue. */ |
8bdee6e2 | 5828 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 5829 | |
273ea72c | 5830 | /* |
4a15001e MD |
5831 | * Get session list pointer. This pointer MUST NOT be free'd. This list |
5832 | * is statically declared in session.c | |
273ea72c | 5833 | */ |
54d01ffb | 5834 | session_list_ptr = session_get_list(); |
b5541356 | 5835 | |
2f77fc4b | 5836 | cmd_init(); |
00e2e675 | 5837 | |
ae9e45b3 DG |
5838 | /* Check for the application socket timeout env variable. */ |
5839 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
5840 | if (env_app_timeout) { | |
87c3f04b | 5841 | config.app_socket_timeout = atoi(env_app_timeout); |
ae9e45b3 | 5842 | } else { |
87c3f04b | 5843 | config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; |
ae9e45b3 DG |
5844 | } |
5845 | ||
4a15001e MD |
5846 | ret = write_pidfile(); |
5847 | if (ret) { | |
5848 | ERR("Error in write_pidfile"); | |
5849 | retval = -1; | |
5850 | goto exit_init_data; | |
5851 | } | |
35f90c40 | 5852 | |
554831e7 MD |
5853 | /* Initialize communication library */ |
5854 | lttcomm_init(); | |
4a15001e | 5855 | /* Initialize TCP timeout values */ |
d831c249 | 5856 | lttcomm_inet_init(); |
554831e7 | 5857 | |
ef367a93 | 5858 | if (load_session_init_data(&load_info) < 0) { |
4a15001e MD |
5859 | retval = -1; |
5860 | goto exit_init_data; | |
ef367a93 | 5861 | } |
87c3f04b | 5862 | load_info->path = config.load_session_path.value; |
ef367a93 | 5863 | |
12b4fb37 | 5864 | /* Create health-check thread. */ |
1a1a34b4 | 5865 | ret = pthread_create(&health_thread, default_pthread_attr(), |
44a5e5eb | 5866 | thread_manage_health, (void *) NULL); |
4a15001e MD |
5867 | if (ret) { |
5868 | errno = ret; | |
44a5e5eb | 5869 | PERROR("pthread_create health"); |
4a15001e | 5870 | retval = -1; |
44a5e5eb DG |
5871 | goto exit_health; |
5872 | } | |
5873 | ||
b3530820 JG |
5874 | /* notification_thread_data acquires the pipes' read side. */ |
5875 | notification_thread_handle = notification_thread_handle_create( | |
5876 | ust32_channel_monitor_pipe, | |
5877 | ust64_channel_monitor_pipe, | |
5878 | kernel_channel_monitor_pipe); | |
5879 | if (!notification_thread_handle) { | |
5880 | retval = -1; | |
5881 | ERR("Failed to create notification thread shared data"); | |
5882 | stop_threads(); | |
5883 | goto exit_notification; | |
5884 | } | |
5885 | ||
5886 | /* Create notification thread. */ | |
5887 | ret = pthread_create(¬ification_thread, default_pthread_attr(), | |
5888 | thread_notification, notification_thread_handle); | |
5889 | if (ret) { | |
5890 | errno = ret; | |
5891 | PERROR("pthread_create notification"); | |
5892 | retval = -1; | |
5893 | stop_threads(); | |
5894 | goto exit_notification; | |
5895 | } | |
0e1fc73c | 5896 | notification_thread_running = true; |
b3530820 | 5897 | |
cf3af59e | 5898 | /* Create thread to manage the client socket */ |
1a1a34b4 | 5899 | ret = pthread_create(&client_thread, default_pthread_attr(), |
099e26bd | 5900 | thread_manage_clients, (void *) NULL); |
4a15001e MD |
5901 | if (ret) { |
5902 | errno = ret; | |
76d7553f | 5903 | PERROR("pthread_create clients"); |
4a15001e | 5904 | retval = -1; |
b3530820 | 5905 | stop_threads(); |
cf3af59e MD |
5906 | goto exit_client; |
5907 | } | |
fac6795d | 5908 | |
099e26bd | 5909 | /* Create thread to dispatch registration */ |
1a1a34b4 | 5910 | ret = pthread_create(&dispatch_thread, default_pthread_attr(), |
099e26bd | 5911 | thread_dispatch_ust_registration, (void *) NULL); |
4a15001e MD |
5912 | if (ret) { |
5913 | errno = ret; | |
76d7553f | 5914 | PERROR("pthread_create dispatch"); |
4a15001e | 5915 | retval = -1; |
b3530820 | 5916 | stop_threads(); |
099e26bd DG |
5917 | goto exit_dispatch; |
5918 | } | |
5919 | ||
5920 | /* Create thread to manage application registration. */ | |
1a1a34b4 | 5921 | ret = pthread_create(®_apps_thread, default_pthread_attr(), |
099e26bd | 5922 | thread_registration_apps, (void *) NULL); |
4a15001e MD |
5923 | if (ret) { |
5924 | errno = ret; | |
76d7553f | 5925 | PERROR("pthread_create registration"); |
4a15001e | 5926 | retval = -1; |
b3530820 | 5927 | stop_threads(); |
099e26bd DG |
5928 | goto exit_reg_apps; |
5929 | } | |
5930 | ||
cf3af59e | 5931 | /* Create thread to manage application socket */ |
1a1a34b4 | 5932 | ret = pthread_create(&apps_thread, default_pthread_attr(), |
54d01ffb | 5933 | thread_manage_apps, (void *) NULL); |
4a15001e MD |
5934 | if (ret) { |
5935 | errno = ret; | |
d0b96690 | 5936 | PERROR("pthread_create apps"); |
4a15001e | 5937 | retval = -1; |
b3530820 | 5938 | stop_threads(); |
d0b96690 DG |
5939 | goto exit_apps; |
5940 | } | |
5941 | ||
5942 | /* Create thread to manage application notify socket */ | |
1a1a34b4 | 5943 | ret = pthread_create(&apps_notify_thread, default_pthread_attr(), |
d0b96690 | 5944 | ust_thread_manage_notify, (void *) NULL); |
4a15001e MD |
5945 | if (ret) { |
5946 | errno = ret; | |
f5c32ef1 | 5947 | PERROR("pthread_create notify"); |
4a15001e | 5948 | retval = -1; |
b3530820 | 5949 | stop_threads(); |
9563b0ad | 5950 | goto exit_apps_notify; |
cf3af59e | 5951 | } |
fac6795d | 5952 | |
022d91ba | 5953 | /* Create agent registration thread. */ |
1a1a34b4 | 5954 | ret = pthread_create(&agent_reg_thread, default_pthread_attr(), |
022d91ba | 5955 | agent_thread_manage_registration, (void *) NULL); |
4a15001e MD |
5956 | if (ret) { |
5957 | errno = ret; | |
022d91ba | 5958 | PERROR("pthread_create agent"); |
4a15001e | 5959 | retval = -1; |
b3530820 | 5960 | stop_threads(); |
022d91ba | 5961 | goto exit_agent_reg; |
4d076222 DG |
5962 | } |
5963 | ||
6620da75 | 5964 | /* Don't start this thread if kernel tracing is not requested nor root */ |
87c3f04b | 5965 | if (is_root && !config.no_kernel) { |
6620da75 | 5966 | /* Create kernel thread to manage kernel event */ |
1a1a34b4 | 5967 | ret = pthread_create(&kernel_thread, default_pthread_attr(), |
6620da75 | 5968 | thread_manage_kernel, (void *) NULL); |
4a15001e MD |
5969 | if (ret) { |
5970 | errno = ret; | |
6620da75 | 5971 | PERROR("pthread_create kernel"); |
4a15001e | 5972 | retval = -1; |
b3530820 | 5973 | stop_threads(); |
6620da75 DG |
5974 | goto exit_kernel; |
5975 | } | |
ef367a93 | 5976 | } |
7a485870 | 5977 | |
4a15001e | 5978 | /* Create session loading thread. */ |
1a1a34b4 MJ |
5979 | ret = pthread_create(&load_session_thread, default_pthread_attr(), |
5980 | thread_load_session, load_info); | |
4a15001e MD |
5981 | if (ret) { |
5982 | errno = ret; | |
5983 | PERROR("pthread_create load_session_thread"); | |
5984 | retval = -1; | |
b3530820 | 5985 | stop_threads(); |
4a15001e MD |
5986 | goto exit_load_session; |
5987 | } | |
5988 | ||
5989 | /* | |
5990 | * This is where we start awaiting program completion (e.g. through | |
5991 | * signal that asks threads to teardown). | |
5992 | */ | |
5993 | ||
5994 | ret = pthread_join(load_session_thread, &status); | |
5995 | if (ret) { | |
5996 | errno = ret; | |
5997 | PERROR("pthread_join load_session_thread"); | |
5998 | retval = -1; | |
5999 | } | |
6000 | exit_load_session: | |
ef367a93 | 6001 | |
87c3f04b | 6002 | if (is_root && !config.no_kernel) { |
6620da75 | 6003 | ret = pthread_join(kernel_thread, &status); |
4a15001e MD |
6004 | if (ret) { |
6005 | errno = ret; | |
6620da75 | 6006 | PERROR("pthread_join"); |
4a15001e | 6007 | retval = -1; |
6620da75 | 6008 | } |
fac6795d | 6009 | } |
cf3af59e | 6010 | exit_kernel: |
4a15001e | 6011 | |
022d91ba | 6012 | ret = pthread_join(agent_reg_thread, &status); |
4a15001e MD |
6013 | if (ret) { |
6014 | errno = ret; | |
022d91ba | 6015 | PERROR("pthread_join agent"); |
4a15001e | 6016 | retval = -1; |
4d076222 | 6017 | } |
022d91ba | 6018 | exit_agent_reg: |
4a15001e | 6019 | |
9563b0ad | 6020 | ret = pthread_join(apps_notify_thread, &status); |
4a15001e MD |
6021 | if (ret) { |
6022 | errno = ret; | |
9563b0ad | 6023 | PERROR("pthread_join apps notify"); |
4a15001e | 6024 | retval = -1; |
9563b0ad | 6025 | } |
9563b0ad | 6026 | exit_apps_notify: |
4a15001e | 6027 | |
cf3af59e | 6028 | ret = pthread_join(apps_thread, &status); |
4a15001e MD |
6029 | if (ret) { |
6030 | errno = ret; | |
9563b0ad | 6031 | PERROR("pthread_join apps"); |
4a15001e | 6032 | retval = -1; |
cf3af59e | 6033 | } |
cf3af59e | 6034 | exit_apps: |
4a15001e | 6035 | |
099e26bd | 6036 | ret = pthread_join(reg_apps_thread, &status); |
4a15001e MD |
6037 | if (ret) { |
6038 | errno = ret; | |
76d7553f | 6039 | PERROR("pthread_join"); |
4a15001e | 6040 | retval = -1; |
099e26bd | 6041 | } |
099e26bd | 6042 | exit_reg_apps: |
4a15001e | 6043 | |
772b8f4d MD |
6044 | /* |
6045 | * Join dispatch thread after joining reg_apps_thread to ensure | |
6046 | * we don't leak applications in the queue. | |
6047 | */ | |
099e26bd | 6048 | ret = pthread_join(dispatch_thread, &status); |
4a15001e MD |
6049 | if (ret) { |
6050 | errno = ret; | |
76d7553f | 6051 | PERROR("pthread_join"); |
4a15001e | 6052 | retval = -1; |
099e26bd | 6053 | } |
099e26bd | 6054 | exit_dispatch: |
4a15001e | 6055 | |
cf3af59e | 6056 | ret = pthread_join(client_thread, &status); |
4a15001e MD |
6057 | if (ret) { |
6058 | errno = ret; | |
76d7553f | 6059 | PERROR("pthread_join"); |
4a15001e | 6060 | retval = -1; |
cf3af59e | 6061 | } |
a88df331 | 6062 | |
b3530820 JG |
6063 | exit_client: |
6064 | exit_notification: | |
4a15001e MD |
6065 | ret = pthread_join(health_thread, &status); |
6066 | if (ret) { | |
6067 | errno = ret; | |
6068 | PERROR("pthread_join health thread"); | |
6069 | retval = -1; | |
06f525de DG |
6070 | } |
6071 | ||
b3530820 | 6072 | exit_health: |
4a15001e | 6073 | exit_init_data: |
4d62fbf8 MD |
6074 | /* |
6075 | * Wait for all pending call_rcu work to complete before tearing | |
6076 | * down data structures. call_rcu worker may be trying to | |
6077 | * perform lookups in those structures. | |
6078 | */ | |
6079 | rcu_barrier(); | |
4a15001e MD |
6080 | /* |
6081 | * sessiond_cleanup() is called when no other thread is running, except | |
6082 | * the ht_cleanup thread, which is needed to destroy the hash tables. | |
6083 | */ | |
6084 | rcu_thread_online(); | |
6085 | sessiond_cleanup(); | |
06f525de | 6086 | |
c4d5de9d JG |
6087 | /* |
6088 | * Ensure all prior call_rcu are done. call_rcu callbacks may push | |
6089 | * hash tables to the ht_cleanup thread. Therefore, we ensure that | |
6090 | * the queue is empty before shutting down the clean-up thread. | |
6091 | */ | |
6092 | rcu_barrier(); | |
6093 | ||
b3530820 JG |
6094 | /* |
6095 | * The teardown of the notification system is performed after the | |
6096 | * session daemon's teardown in order to allow it to be notified | |
6097 | * of the active session and channels at the moment of the teardown. | |
6098 | */ | |
6099 | if (notification_thread_handle) { | |
0e1fc73c JG |
6100 | if (notification_thread_running) { |
6101 | notification_thread_command_quit( | |
6102 | notification_thread_handle); | |
6103 | ret = pthread_join(notification_thread, &status); | |
6104 | if (ret) { | |
6105 | errno = ret; | |
6106 | PERROR("pthread_join notification thread"); | |
6107 | retval = -1; | |
6108 | } | |
a9398721 | 6109 | } |
0e1fc73c | 6110 | notification_thread_handle_destroy(notification_thread_handle); |
b3530820 JG |
6111 | } |
6112 | ||
6113 | rcu_thread_offline(); | |
6114 | rcu_unregister_thread(); | |
6115 | ||
5e97de00 | 6116 | ret = fini_ht_cleanup_thread(&ht_cleanup_thread); |
4a15001e | 6117 | if (ret) { |
4a15001e | 6118 | retval = -1; |
0b2dc8df | 6119 | } |
b3530820 JG |
6120 | lttng_pipe_destroy(ust32_channel_monitor_pipe); |
6121 | lttng_pipe_destroy(ust64_channel_monitor_pipe); | |
6122 | lttng_pipe_destroy(kernel_channel_monitor_pipe); | |
0b2dc8df | 6123 | exit_ht_cleanup: |
4a15001e | 6124 | |
4a15001e MD |
6125 | health_app_destroy(health_sessiond); |
6126 | exit_health_sessiond_cleanup: | |
7567352f | 6127 | exit_create_run_as_worker_cleanup: |
4a15001e MD |
6128 | |
6129 | exit_options: | |
ac003230 | 6130 | sessiond_cleanup_lock_file(); |
4a15001e MD |
6131 | sessiond_cleanup_options(); |
6132 | ||
6133 | exit_set_signal_handler: | |
6134 | if (!retval) { | |
cf3af59e | 6135 | exit(EXIT_SUCCESS); |
4a15001e MD |
6136 | } else { |
6137 | exit(EXIT_FAILURE); | |
67e40797 | 6138 | } |
fac6795d | 6139 | } |