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> |
fac6795d | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
0fdd1e2c | 28 | #include <sys/mman.h> |
b73401da | 29 | #include <sys/mount.h> |
1e307fab | 30 | #include <sys/resource.h> |
fac6795d DG |
31 | #include <sys/socket.h> |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
0fdd1e2c | 34 | #include <sys/wait.h> |
5c827ce0 | 35 | #include <urcu/uatomic.h> |
fac6795d | 36 | #include <unistd.h> |
3bd1e081 | 37 | #include <config.h> |
fac6795d | 38 | |
990570ed | 39 | #include <common/common.h> |
0ba98ebc | 40 | #include <common/compat/poll.h> |
d27c42b8 | 41 | #include <common/compat/socket.h> |
db758600 DG |
42 | #include <common/defaults.h> |
43 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 44 | #include <common/futex.h> |
00e2e675 | 45 | #include <common/relayd/relayd.h> |
81b86775 | 46 | #include <common/utils.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
2f77fc4b | 50 | #include "cmd.h" |
00e2e675 | 51 | #include "consumer.h" |
099e26bd | 52 | #include "context.h" |
54d01ffb | 53 | #include "event.h" |
4771f025 | 54 | #include "kernel.h" |
f1e16794 | 55 | #include "kernel-consumer.h" |
096102bd | 56 | #include "modprobe.h" |
0fdd1e2c | 57 | #include "shm.h" |
1e307fab | 58 | #include "ust-ctl.h" |
00e2e675 | 59 | #include "ust-consumer.h" |
8e68d1c8 | 60 | #include "utils.h" |
4063050c | 61 | #include "fd-limit.h" |
44a5e5eb | 62 | #include "health.h" |
8ac94142 | 63 | #include "testpoint.h" |
fac6795d | 64 | |
ebaeda94 MD |
65 | #define CONSUMERD_FILE "lttng-consumerd" |
66 | ||
75462a81 | 67 | /* Const values */ |
686204ab | 68 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 69 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
70 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
71 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
72 | ||
fac6795d DG |
73 | const char *progname; |
74 | const char *opt_tracing_group; | |
5b8719f5 | 75 | static int opt_sig_parent; |
97e19046 | 76 | static int opt_verbose_consumer; |
fac6795d | 77 | static int opt_daemon; |
4fba7219 | 78 | static int opt_no_kernel; |
fac6795d | 79 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 80 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 81 | static char *rundir; |
3bd1e081 | 82 | |
a23ec3a7 DG |
83 | /* |
84 | * Consumer daemon specific control data. Every value not initialized here is | |
85 | * set to 0 by the static definition. | |
86 | */ | |
3bd1e081 MD |
87 | static struct consumer_data kconsumer_data = { |
88 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
89 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
90 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
91 | .err_sock = -1, |
92 | .cmd_sock = -1, | |
173af62f DG |
93 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
94 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
95 | .cond = PTHREAD_COND_INITIALIZER, |
96 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 97 | }; |
7753dea8 MD |
98 | static struct consumer_data ustconsumer64_data = { |
99 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
100 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
101 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
102 | .err_sock = -1, |
103 | .cmd_sock = -1, | |
173af62f DG |
104 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
105 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
106 | .cond = PTHREAD_COND_INITIALIZER, |
107 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
108 | }; |
109 | static struct consumer_data ustconsumer32_data = { | |
110 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
111 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
112 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
113 | .err_sock = -1, |
114 | .cmd_sock = -1, | |
173af62f DG |
115 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
116 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
117 | .cond = PTHREAD_COND_INITIALIZER, |
118 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
119 | }; |
120 | ||
26c9d55e | 121 | /* Shared between threads */ |
099e26bd | 122 | static int dispatch_thread_exit; |
fac6795d | 123 | |
54d01ffb DG |
124 | /* Global application Unix socket path */ |
125 | static char apps_unix_sock_path[PATH_MAX]; | |
126 | /* Global client Unix socket path */ | |
127 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
128 | /* global wait shm path for UST */ |
129 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
130 | /* Global health check unix path */ |
131 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 132 | |
1d4b027a | 133 | /* Sockets and FDs */ |
a4b35e07 MD |
134 | static int client_sock = -1; |
135 | static int apps_sock = -1; | |
2f77fc4b | 136 | int kernel_tracer_fd = -1; |
76d7553f | 137 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 138 | |
273ea72c DG |
139 | /* |
140 | * Quit pipe for all threads. This permits a single cancellation point | |
141 | * for all threads when receiving an event on the pipe. | |
142 | */ | |
76d7553f | 143 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 144 | |
099e26bd DG |
145 | /* |
146 | * This pipe is used to inform the thread managing application communication | |
147 | * that a command is queued and ready to be processed. | |
148 | */ | |
76d7553f | 149 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 150 | |
1d4b027a | 151 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 152 | static pthread_t apps_thread; |
099e26bd | 153 | static pthread_t reg_apps_thread; |
1d4b027a | 154 | static pthread_t client_thread; |
7a485870 | 155 | static pthread_t kernel_thread; |
099e26bd | 156 | static pthread_t dispatch_thread; |
44a5e5eb | 157 | static pthread_t health_thread; |
5eb91c98 | 158 | |
099e26bd DG |
159 | /* |
160 | * UST registration command queue. This queue is tied with a futex and uses a N | |
161 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
162 | * | |
163 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
164 | * this queue and the wait/wake scheme. | |
165 | */ | |
166 | static struct ust_cmd_queue ust_cmd_queue; | |
167 | ||
b5541356 DG |
168 | /* |
169 | * Pointer initialized before thread creation. | |
170 | * | |
171 | * This points to the tracing session list containing the session count and a | |
172 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
173 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 174 | * |
d063d709 | 175 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 176 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
177 | */ |
178 | static struct ltt_session_list *session_list_ptr; | |
179 | ||
7753dea8 MD |
180 | int ust_consumerd64_fd = -1; |
181 | int ust_consumerd32_fd = -1; | |
182 | ||
fb6f1fa2 YB |
183 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
184 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
185 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
186 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 187 | |
2f77fc4b DG |
188 | static const char *module_proc_lttng = "/proc/lttng"; |
189 | ||
5c827ce0 DG |
190 | /* |
191 | * Consumer daemon state which is changed when spawning it, killing it or in | |
192 | * case of a fatal error. | |
193 | */ | |
194 | enum consumerd_state { | |
195 | CONSUMER_STARTED = 1, | |
196 | CONSUMER_STOPPED = 2, | |
197 | CONSUMER_ERROR = 3, | |
198 | }; | |
199 | ||
200 | /* | |
201 | * This consumer daemon state is used to validate if a client command will be | |
202 | * able to reach the consumer. If not, the client is informed. For instance, | |
203 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
204 | * error to the client. | |
205 | * | |
206 | * The following example shows a possible race condition of this scheme: | |
207 | * | |
208 | * consumer thread error happens | |
209 | * client cmd arrives | |
210 | * client cmd checks state -> still OK | |
211 | * consumer thread exit, sets error | |
212 | * client cmd try to talk to consumer | |
213 | * ... | |
214 | * | |
215 | * However, since the consumer is a different daemon, we have no way of making | |
216 | * sure the command will reach it safely even with this state flag. This is why | |
217 | * we consider that up to the state validation during command processing, the | |
218 | * command is safe. After that, we can not guarantee the correctness of the | |
219 | * client request vis-a-vis the consumer. | |
220 | */ | |
221 | static enum consumerd_state ust_consumerd_state; | |
222 | static enum consumerd_state kernel_consumerd_state; | |
223 | ||
44a5e5eb DG |
224 | /* Used for the health monitoring of the session daemon. See health.h */ |
225 | struct health_state health_thread_cmd; | |
139ac872 | 226 | struct health_state health_thread_app_manage; |
44a5e5eb DG |
227 | struct health_state health_thread_app_reg; |
228 | struct health_state health_thread_kernel; | |
229 | ||
ae9e45b3 DG |
230 | /* |
231 | * Socket timeout for receiving and sending in seconds. | |
232 | */ | |
233 | static int app_socket_timeout; | |
234 | ||
fb09408a | 235 | static |
7753dea8 | 236 | void setup_consumerd_path(void) |
fb09408a | 237 | { |
fc7a59ce | 238 | const char *bin, *libdir; |
fb09408a | 239 | |
7753dea8 MD |
240 | /* |
241 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
242 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
243 | * has not been defined. | |
7753dea8 | 244 | */ |
ebaeda94 | 245 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
246 | if (!consumerd32_bin[0]) { |
247 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
248 | } |
249 | if (!consumerd32_libdir[0]) { | |
250 | consumerd32_libdir = INSTALL_LIB_PATH; | |
251 | } | |
252 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
253 | if (!consumerd64_bin[0]) { |
254 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 255 | } |
ebaeda94 MD |
256 | if (!consumerd64_libdir[0]) { |
257 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
258 | } |
259 | #else | |
260 | #error "Unknown bitness" | |
261 | #endif | |
262 | ||
fb09408a MD |
263 | /* |
264 | * runtime env. var. overrides the build default. | |
265 | */ | |
fc7a59ce AM |
266 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
267 | if (bin) { | |
268 | consumerd32_bin = bin; | |
7753dea8 | 269 | } |
fc7a59ce AM |
270 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
271 | if (bin) { | |
272 | consumerd64_bin = bin; | |
ebaeda94 | 273 | } |
72f579ee | 274 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
275 | if (libdir) { |
276 | consumerd32_libdir = libdir; | |
277 | } | |
72f579ee | 278 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
279 | if (libdir) { |
280 | consumerd64_libdir = libdir; | |
fb09408a MD |
281 | } |
282 | } | |
283 | ||
5eb91c98 DG |
284 | /* |
285 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
286 | */ | |
287 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
288 | unsigned int size) | |
289 | { | |
290 | int ret; | |
291 | ||
292 | if (events == NULL || size == 0) { | |
293 | ret = -1; | |
294 | goto error; | |
295 | } | |
296 | ||
297 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
298 | if (ret < 0) { | |
299 | goto error; | |
300 | } | |
301 | ||
302 | /* Add quit pipe */ | |
303 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
304 | if (ret < 0) { | |
305 | goto error; | |
306 | } | |
307 | ||
308 | return 0; | |
309 | ||
310 | error: | |
311 | return ret; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Check if the thread quit pipe was triggered. | |
316 | * | |
317 | * Return 1 if it was triggered else 0; | |
318 | */ | |
319 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
320 | { | |
321 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
322 | return 1; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
0fdd1e2c DG |
328 | /* |
329 | * Return group ID of the tracing group or -1 if not found. | |
330 | */ | |
996b65c8 MD |
331 | static gid_t allowed_group(void) |
332 | { | |
333 | struct group *grp; | |
334 | ||
274e143b MD |
335 | if (opt_tracing_group) { |
336 | grp = getgrnam(opt_tracing_group); | |
337 | } else { | |
338 | grp = getgrnam(default_tracing_group); | |
339 | } | |
996b65c8 MD |
340 | if (!grp) { |
341 | return -1; | |
342 | } else { | |
343 | return grp->gr_gid; | |
344 | } | |
345 | } | |
346 | ||
273ea72c | 347 | /* |
5eb91c98 | 348 | * Init thread quit pipe. |
273ea72c DG |
349 | * |
350 | * Return -1 on error or 0 if all pipes are created. | |
351 | */ | |
352 | static int init_thread_quit_pipe(void) | |
353 | { | |
730389d9 | 354 | int ret, i; |
273ea72c | 355 | |
730389d9 | 356 | ret = pipe(thread_quit_pipe); |
273ea72c | 357 | if (ret < 0) { |
730389d9 | 358 | PERROR("thread quit pipe"); |
273ea72c DG |
359 | goto error; |
360 | } | |
361 | ||
730389d9 DG |
362 | for (i = 0; i < 2; i++) { |
363 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
364 | if (ret < 0) { | |
365 | PERROR("fcntl"); | |
366 | goto error; | |
367 | } | |
368 | } | |
369 | ||
273ea72c DG |
370 | error: |
371 | return ret; | |
372 | } | |
373 | ||
099e26bd DG |
374 | /* |
375 | * Stop all threads by closing the thread quit pipe. | |
376 | */ | |
cf3af59e MD |
377 | static void stop_threads(void) |
378 | { | |
5eb91c98 DG |
379 | int ret; |
380 | ||
cf3af59e MD |
381 | /* Stopping all threads */ |
382 | DBG("Terminating all threads"); | |
54d01ffb | 383 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
384 | if (ret < 0) { |
385 | ERR("write error on thread quit pipe"); | |
386 | } | |
387 | ||
099e26bd | 388 | /* Dispatch thread */ |
26c9d55e | 389 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 390 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
391 | } |
392 | ||
fac6795d | 393 | /* |
d063d709 | 394 | * Cleanup the daemon |
fac6795d | 395 | */ |
cf3af59e | 396 | static void cleanup(void) |
fac6795d | 397 | { |
ef599319 | 398 | int ret; |
6620da75 | 399 | char *cmd = NULL; |
af9737e9 | 400 | struct ltt_session *sess, *stmp; |
fac6795d | 401 | |
1d4b027a | 402 | DBG("Cleaning up"); |
e07ae692 | 403 | |
2f77fc4b DG |
404 | /* First thing first, stop all threads */ |
405 | utils_close_pipe(thread_quit_pipe); | |
406 | ||
67e40797 DG |
407 | DBG("Removing %s directory", rundir); |
408 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
409 | if (ret < 0) { | |
410 | ERR("asprintf failed. Something is really wrong!"); | |
411 | } | |
5461b305 | 412 | |
67e40797 DG |
413 | /* Remove lttng run directory */ |
414 | ret = system(cmd); | |
415 | if (ret < 0) { | |
416 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 417 | } |
67e40797 | 418 | free(cmd); |
bd69add2 | 419 | free(rundir); |
5461b305 | 420 | |
99bab54f | 421 | DBG("Cleaning up all sessions"); |
fac6795d | 422 | |
b5541356 | 423 | /* Destroy session list mutex */ |
273ea72c DG |
424 | if (session_list_ptr != NULL) { |
425 | pthread_mutex_destroy(&session_list_ptr->lock); | |
426 | ||
427 | /* Cleanup ALL session */ | |
54d01ffb DG |
428 | cds_list_for_each_entry_safe(sess, stmp, |
429 | &session_list_ptr->head, list) { | |
2f77fc4b | 430 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
431 | } |
432 | } | |
433 | ||
099e26bd | 434 | DBG("Closing all UST sockets"); |
56fff090 | 435 | ust_app_clean_list(); |
099e26bd | 436 | |
4fba7219 DG |
437 | if (is_root && !opt_no_kernel) { |
438 | DBG2("Closing kernel fd"); | |
a4b35e07 | 439 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
440 | ret = close(kernel_tracer_fd); |
441 | if (ret) { | |
442 | PERROR("close"); | |
443 | } | |
a4b35e07 | 444 | } |
2f50c8a3 | 445 | DBG("Unloading kernel modules"); |
096102bd | 446 | modprobe_remove_lttng_all(); |
2f50c8a3 | 447 | } |
2f77fc4b | 448 | |
421cb601 | 449 | /* <fun> */ |
f56a39af | 450 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
451 | "Matthew, BEET driven development works!%c[%dm", |
452 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
453 | /* </fun> */ | |
fac6795d DG |
454 | } |
455 | ||
e065084a | 456 | /* |
d063d709 | 457 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 458 | * |
d063d709 | 459 | * Return lttcomm error code. |
e065084a DG |
460 | */ |
461 | static int send_unix_sock(int sock, void *buf, size_t len) | |
462 | { | |
463 | /* Check valid length */ | |
464 | if (len <= 0) { | |
465 | return -1; | |
466 | } | |
467 | ||
468 | return lttcomm_send_unix_sock(sock, buf, len); | |
469 | } | |
470 | ||
5461b305 | 471 | /* |
d063d709 | 472 | * Free memory of a command context structure. |
5461b305 | 473 | */ |
a2fb29a5 | 474 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 475 | { |
a2fb29a5 DG |
476 | DBG("Clean command context structure"); |
477 | if (*cmd_ctx) { | |
478 | if ((*cmd_ctx)->llm) { | |
479 | free((*cmd_ctx)->llm); | |
5461b305 | 480 | } |
a2fb29a5 DG |
481 | if ((*cmd_ctx)->lsm) { |
482 | free((*cmd_ctx)->lsm); | |
5461b305 | 483 | } |
a2fb29a5 DG |
484 | free(*cmd_ctx); |
485 | *cmd_ctx = NULL; | |
5461b305 DG |
486 | } |
487 | } | |
488 | ||
fac6795d | 489 | /* |
0fdd1e2c | 490 | * Notify UST applications using the shm mmap futex. |
fac6795d | 491 | */ |
0fdd1e2c | 492 | static int notify_ust_apps(int active) |
fac6795d | 493 | { |
0fdd1e2c | 494 | char *wait_shm_mmap; |
fac6795d | 495 | |
0fdd1e2c | 496 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 497 | |
0fdd1e2c DG |
498 | /* See shm.c for this call implying mmap, shm and futex calls */ |
499 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
500 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
501 | goto error; |
502 | } | |
503 | ||
0fdd1e2c DG |
504 | /* Wake waiting process */ |
505 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
506 | ||
507 | /* Apps notified successfully */ | |
508 | return 0; | |
fac6795d DG |
509 | |
510 | error: | |
0fdd1e2c | 511 | return -1; |
fac6795d DG |
512 | } |
513 | ||
e065084a | 514 | /* |
d063d709 DG |
515 | * Setup the outgoing data buffer for the response (llm) by allocating the |
516 | * right amount of memory and copying the original information from the lsm | |
517 | * structure. | |
ca95a216 | 518 | * |
d063d709 | 519 | * Return total size of the buffer pointed by buf. |
ca95a216 | 520 | */ |
5461b305 | 521 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 522 | { |
f3ed775e | 523 | int ret, buf_size; |
ca95a216 | 524 | |
f3ed775e | 525 | buf_size = size; |
5461b305 | 526 | |
ba7f0ae5 | 527 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 528 | if (cmd_ctx->llm == NULL) { |
76d7553f | 529 | PERROR("zmalloc"); |
5461b305 | 530 | ret = -ENOMEM; |
ca95a216 DG |
531 | goto error; |
532 | } | |
533 | ||
5461b305 DG |
534 | /* Copy common data */ |
535 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 536 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 537 | |
5461b305 DG |
538 | cmd_ctx->llm->data_size = size; |
539 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
540 | ||
ca95a216 DG |
541 | return buf_size; |
542 | ||
543 | error: | |
544 | return ret; | |
545 | } | |
546 | ||
7a485870 | 547 | /* |
5eb91c98 | 548 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 549 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 550 | */ |
5eb91c98 | 551 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 552 | { |
5eb91c98 | 553 | int ret; |
7a485870 DG |
554 | struct ltt_session *session; |
555 | struct ltt_kernel_channel *channel; | |
556 | ||
5eb91c98 | 557 | DBG("Updating kernel poll set"); |
7a485870 | 558 | |
54d01ffb | 559 | session_lock_list(); |
b5541356 | 560 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 561 | session_lock(session); |
7a485870 | 562 | if (session->kernel_session == NULL) { |
54d01ffb | 563 | session_unlock(session); |
7a485870 DG |
564 | continue; |
565 | } | |
7a485870 | 566 | |
54d01ffb DG |
567 | cds_list_for_each_entry(channel, |
568 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
569 | /* Add channel fd to the kernel poll set */ |
570 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
571 | if (ret < 0) { | |
54d01ffb | 572 | session_unlock(session); |
5eb91c98 DG |
573 | goto error; |
574 | } | |
575 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 576 | } |
54d01ffb | 577 | session_unlock(session); |
7a485870 | 578 | } |
54d01ffb | 579 | session_unlock_list(); |
7a485870 | 580 | |
5eb91c98 | 581 | return 0; |
7a485870 DG |
582 | |
583 | error: | |
54d01ffb | 584 | session_unlock_list(); |
7a485870 DG |
585 | return -1; |
586 | } | |
587 | ||
588 | /* | |
54d01ffb | 589 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 590 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 591 | * |
d063d709 | 592 | * Useful for CPU hotplug feature. |
7a485870 | 593 | */ |
2bdd86d4 | 594 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
595 | { |
596 | int ret = 0; | |
597 | struct ltt_session *session; | |
173af62f | 598 | struct ltt_kernel_session *ksess; |
7a485870 DG |
599 | struct ltt_kernel_channel *channel; |
600 | ||
601 | DBG("Updating kernel streams for channel fd %d", fd); | |
602 | ||
54d01ffb | 603 | session_lock_list(); |
b5541356 | 604 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 605 | session_lock(session); |
7a485870 | 606 | if (session->kernel_session == NULL) { |
54d01ffb | 607 | session_unlock(session); |
7a485870 DG |
608 | continue; |
609 | } | |
173af62f | 610 | ksess = session->kernel_session; |
d9800920 | 611 | |
173af62f | 612 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
613 | if (channel->fd == fd) { |
614 | DBG("Channel found, updating kernel streams"); | |
615 | ret = kernel_open_channel_stream(channel); | |
616 | if (ret < 0) { | |
b3c750d2 | 617 | goto error; |
7a485870 | 618 | } |
d9800920 | 619 | |
7a485870 | 620 | /* |
5eb91c98 DG |
621 | * Have we already sent fds to the consumer? If yes, it means |
622 | * that tracing is started so it is safe to send our updated | |
623 | * stream fds. | |
7a485870 | 624 | */ |
173af62f DG |
625 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
626 | struct lttng_ht_iter iter; | |
627 | struct consumer_socket *socket; | |
628 | ||
629 | ||
630 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
631 | &iter.iter, socket, node.node) { | |
632 | /* Code flow error */ | |
633 | assert(socket->fd >= 0); | |
634 | ||
635 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 636 | ret = kernel_consumer_send_channel_stream(socket, |
173af62f DG |
637 | channel, ksess); |
638 | pthread_mutex_unlock(socket->lock); | |
639 | if (ret < 0) { | |
640 | goto error; | |
641 | } | |
7a485870 DG |
642 | } |
643 | } | |
b3c750d2 | 644 | goto error; |
7a485870 DG |
645 | } |
646 | } | |
54d01ffb | 647 | session_unlock(session); |
7a485870 | 648 | } |
54d01ffb | 649 | session_unlock_list(); |
b3c750d2 | 650 | return ret; |
7a485870 | 651 | |
b3c750d2 | 652 | error: |
54d01ffb DG |
653 | session_unlock(session); |
654 | session_unlock_list(); | |
7a485870 DG |
655 | return ret; |
656 | } | |
657 | ||
487cf67c DG |
658 | /* |
659 | * For each tracing session, update newly registered apps. | |
660 | */ | |
661 | static void update_ust_app(int app_sock) | |
662 | { | |
663 | struct ltt_session *sess, *stmp; | |
664 | ||
4ee14516 DG |
665 | session_lock_list(); |
666 | ||
487cf67c DG |
667 | /* For all tracing session(s) */ |
668 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 669 | session_lock(sess); |
421cb601 DG |
670 | if (sess->ust_session) { |
671 | ust_app_global_update(sess->ust_session, app_sock); | |
672 | } | |
4ee14516 | 673 | session_unlock(sess); |
487cf67c | 674 | } |
4ee14516 DG |
675 | |
676 | session_unlock_list(); | |
487cf67c DG |
677 | } |
678 | ||
7a485870 | 679 | /* |
d063d709 | 680 | * This thread manage event coming from the kernel. |
7a485870 | 681 | * |
d063d709 DG |
682 | * Features supported in this thread: |
683 | * -) CPU Hotplug | |
7a485870 DG |
684 | */ |
685 | static void *thread_manage_kernel(void *data) | |
686 | { | |
139ac872 | 687 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 688 | uint32_t revents, nb_fd; |
7a485870 | 689 | char tmp; |
5eb91c98 | 690 | struct lttng_poll_event events; |
7a485870 | 691 | |
6993eeb3 | 692 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 693 | |
6993eeb3 CB |
694 | if (testpoint(thread_manage_kernel)) { |
695 | goto error_testpoint; | |
696 | } | |
8ac94142 | 697 | |
44a5e5eb DG |
698 | health_code_update(&health_thread_kernel); |
699 | ||
5eb91c98 DG |
700 | ret = create_thread_poll_set(&events, 2); |
701 | if (ret < 0) { | |
76d7553f | 702 | goto error_poll_create; |
5eb91c98 DG |
703 | } |
704 | ||
705 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
706 | if (ret < 0) { | |
707 | goto error; | |
708 | } | |
709 | ||
6993eeb3 CB |
710 | if (testpoint(thread_manage_kernel_before_loop)) { |
711 | goto error; | |
712 | } | |
713 | ||
7a485870 | 714 | while (1) { |
44a5e5eb DG |
715 | health_code_update(&health_thread_kernel); |
716 | ||
7a485870 | 717 | if (update_poll_flag == 1) { |
5f822d0a DG |
718 | /* |
719 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
720 | * quit pipe and the kernel pipe. | |
721 | */ | |
722 | events.nb_fd = 2; | |
723 | ||
5eb91c98 DG |
724 | ret = update_kernel_poll(&events); |
725 | if (ret < 0) { | |
7a485870 DG |
726 | goto error; |
727 | } | |
728 | update_poll_flag = 0; | |
729 | } | |
730 | ||
5eb91c98 DG |
731 | nb_fd = LTTNG_POLL_GETNB(&events); |
732 | ||
733 | DBG("Thread kernel polling on %d fds", nb_fd); | |
734 | ||
735 | /* Zeroed the poll events */ | |
736 | lttng_poll_reset(&events); | |
7a485870 DG |
737 | |
738 | /* Poll infinite value of time */ | |
88f2b785 | 739 | restart: |
44a5e5eb | 740 | health_poll_update(&health_thread_kernel); |
5eb91c98 | 741 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 742 | health_poll_update(&health_thread_kernel); |
7a485870 | 743 | if (ret < 0) { |
88f2b785 MD |
744 | /* |
745 | * Restart interrupted system call. | |
746 | */ | |
747 | if (errno == EINTR) { | |
748 | goto restart; | |
749 | } | |
7a485870 DG |
750 | goto error; |
751 | } else if (ret == 0) { | |
752 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
753 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
754 | "This should not have happened! Continuing..."); | |
7a485870 DG |
755 | continue; |
756 | } | |
757 | ||
5eb91c98 DG |
758 | for (i = 0; i < nb_fd; i++) { |
759 | /* Fetch once the poll data */ | |
760 | revents = LTTNG_POLL_GETEV(&events, i); | |
761 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 762 | |
44a5e5eb DG |
763 | health_code_update(&health_thread_kernel); |
764 | ||
5eb91c98 DG |
765 | /* Thread quit pipe has been closed. Killing thread. */ |
766 | ret = check_thread_quit_pipe(pollfd, revents); | |
767 | if (ret) { | |
139ac872 MD |
768 | err = 0; |
769 | goto exit; | |
5eb91c98 | 770 | } |
7a485870 | 771 | |
5eb91c98 DG |
772 | /* Check for data on kernel pipe */ |
773 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
774 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
775 | update_poll_flag = 1; | |
776 | continue; | |
777 | } else { | |
778 | /* | |
779 | * New CPU detected by the kernel. Adding kernel stream to | |
780 | * kernel session and updating the kernel consumer | |
781 | */ | |
782 | if (revents & LPOLLIN) { | |
2bdd86d4 | 783 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
784 | if (ret < 0) { |
785 | continue; | |
786 | } | |
787 | break; | |
788 | /* | |
789 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
790 | * and unregister kernel stream at this point. | |
791 | */ | |
7a485870 | 792 | } |
7a485870 DG |
793 | } |
794 | } | |
795 | } | |
796 | ||
139ac872 | 797 | exit: |
7a485870 | 798 | error: |
5eb91c98 | 799 | lttng_poll_clean(&events); |
76d7553f | 800 | error_poll_create: |
6993eeb3 | 801 | error_testpoint: |
6620da75 DG |
802 | utils_close_pipe(kernel_poll_pipe); |
803 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 MD |
804 | if (err) { |
805 | health_error(&health_thread_kernel); | |
806 | ERR("Health error occurred in %s", __func__); | |
6620da75 DG |
807 | WARN("Kernel thread died unexpectedly. " |
808 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 MD |
809 | } |
810 | health_exit(&health_thread_kernel); | |
76d7553f | 811 | DBG("Kernel thread dying"); |
7a485870 DG |
812 | return NULL; |
813 | } | |
814 | ||
a23ec3a7 DG |
815 | /* |
816 | * Signal pthread condition of the consumer data that the thread. | |
817 | */ | |
818 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
819 | { | |
820 | pthread_mutex_lock(&data->cond_mutex); | |
821 | ||
822 | /* | |
823 | * The state is set before signaling. It can be any value, it's the waiter | |
824 | * job to correctly interpret this condition variable associated to the | |
825 | * consumer pthread_cond. | |
826 | * | |
827 | * A value of 0 means that the corresponding thread of the consumer data | |
828 | * was not started. 1 indicates that the thread has started and is ready | |
829 | * for action. A negative value means that there was an error during the | |
830 | * thread bootstrap. | |
831 | */ | |
832 | data->consumer_thread_is_ready = state; | |
833 | (void) pthread_cond_signal(&data->cond); | |
834 | ||
835 | pthread_mutex_unlock(&data->cond_mutex); | |
836 | } | |
837 | ||
1d4b027a | 838 | /* |
3bd1e081 | 839 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 840 | */ |
3bd1e081 | 841 | static void *thread_manage_consumer(void *data) |
1d4b027a | 842 | { |
139ac872 | 843 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 844 | uint32_t revents, nb_fd; |
1d4b027a | 845 | enum lttcomm_return_code code; |
5eb91c98 | 846 | struct lttng_poll_event events; |
3bd1e081 | 847 | struct consumer_data *consumer_data = data; |
1d4b027a | 848 | |
3bd1e081 | 849 | DBG("[thread] Manage consumer started"); |
1d4b027a | 850 | |
9449cc75 DG |
851 | /* |
852 | * Since the consumer thread can be spawned at any moment in time, we init | |
853 | * the health to a poll status (1, which is a valid health over time). | |
854 | * When the thread starts, we update here the health to a "code" path being | |
855 | * an even value so this thread, when reaching a poll wait, does not | |
856 | * trigger an error with an even value. | |
857 | * | |
858 | * Here is the use case we avoid. | |
859 | * | |
860 | * +1: the first poll update during initialization (main()) | |
861 | * +2 * x: multiple code update once in this thread. | |
862 | * +1: poll wait in this thread (being a good health state). | |
863 | * == even number which after the wait period shows as a bad health. | |
864 | * | |
865 | * In a nutshell, the following poll update to the health state brings back | |
866 | * the state to an even value meaning a code path. | |
867 | */ | |
868 | health_poll_update(&consumer_data->health); | |
869 | ||
5eb91c98 DG |
870 | /* |
871 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
872 | * Nothing more will be added to this poll set. | |
873 | */ | |
874 | ret = create_thread_poll_set(&events, 2); | |
875 | if (ret < 0) { | |
76d7553f | 876 | goto error_poll; |
5eb91c98 | 877 | } |
273ea72c | 878 | |
edb8b045 DG |
879 | /* |
880 | * The error socket here is already in a listening state which was done | |
881 | * just before spawning this thread to avoid a race between the consumer | |
882 | * daemon exec trying to connect and the listen() call. | |
883 | */ | |
3bd1e081 | 884 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
885 | if (ret < 0) { |
886 | goto error; | |
887 | } | |
888 | ||
889 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c | 890 | |
44a5e5eb DG |
891 | health_code_update(&consumer_data->health); |
892 | ||
273ea72c | 893 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 894 | restart: |
44a5e5eb | 895 | health_poll_update(&consumer_data->health); |
8ac94142 | 896 | |
6993eeb3 CB |
897 | if (testpoint(thread_manage_consumer)) { |
898 | goto error; | |
899 | } | |
8ac94142 | 900 | |
5eb91c98 | 901 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 902 | health_poll_update(&consumer_data->health); |
273ea72c | 903 | if (ret < 0) { |
88f2b785 MD |
904 | /* |
905 | * Restart interrupted system call. | |
906 | */ | |
907 | if (errno == EINTR) { | |
908 | goto restart; | |
909 | } | |
273ea72c DG |
910 | goto error; |
911 | } | |
912 | ||
5eb91c98 DG |
913 | for (i = 0; i < nb_fd; i++) { |
914 | /* Fetch once the poll data */ | |
915 | revents = LTTNG_POLL_GETEV(&events, i); | |
916 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
917 | ||
44a5e5eb DG |
918 | health_code_update(&consumer_data->health); |
919 | ||
5eb91c98 DG |
920 | /* Thread quit pipe has been closed. Killing thread. */ |
921 | ret = check_thread_quit_pipe(pollfd, revents); | |
922 | if (ret) { | |
139ac872 MD |
923 | err = 0; |
924 | goto exit; | |
5eb91c98 DG |
925 | } |
926 | ||
927 | /* Event on the registration socket */ | |
3bd1e081 | 928 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 929 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 930 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
931 | goto error; |
932 | } | |
933 | } | |
273ea72c DG |
934 | } |
935 | ||
3bd1e081 | 936 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
937 | if (sock < 0) { |
938 | goto error; | |
939 | } | |
940 | ||
b662582b DG |
941 | /* |
942 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
943 | * show must go on. | |
944 | */ | |
945 | (void) utils_set_fd_cloexec(sock); | |
946 | ||
44a5e5eb DG |
947 | health_code_update(&consumer_data->health); |
948 | ||
3bd1e081 | 949 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 950 | |
712ea556 | 951 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
952 | ret = lttcomm_recv_unix_sock(sock, &code, |
953 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
954 | if (ret <= 0) { |
955 | goto error; | |
956 | } | |
957 | ||
44a5e5eb DG |
958 | health_code_update(&consumer_data->health); |
959 | ||
f73fabfd | 960 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 MD |
961 | consumer_data->cmd_sock = |
962 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
963 | if (consumer_data->cmd_sock < 0) { | |
a23ec3a7 DG |
964 | /* On error, signal condition and quit. */ |
965 | signal_consumer_condition(consumer_data, -1); | |
48842b30 | 966 | PERROR("consumer connect"); |
1d4b027a DG |
967 | goto error; |
968 | } | |
a23ec3a7 DG |
969 | signal_consumer_condition(consumer_data, 1); |
970 | DBG("Consumer command socket ready"); | |
1d4b027a | 971 | } else { |
3bd1e081 | 972 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
973 | lttcomm_get_readable_code(-code)); |
974 | goto error; | |
975 | } | |
976 | ||
54d01ffb | 977 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 978 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 979 | if (ret < 0) { |
72079cae DG |
980 | goto error; |
981 | } | |
982 | ||
5eb91c98 DG |
983 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
984 | if (ret < 0) { | |
72079cae | 985 | goto error; |
5eb91c98 DG |
986 | } |
987 | ||
44a5e5eb DG |
988 | health_code_update(&consumer_data->health); |
989 | ||
5eb91c98 DG |
990 | /* Update number of fd */ |
991 | nb_fd = LTTNG_POLL_GETNB(&events); | |
992 | ||
993 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 994 | restart_poll: |
44a5e5eb | 995 | health_poll_update(&consumer_data->health); |
5eb91c98 | 996 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 997 | health_poll_update(&consumer_data->health); |
5eb91c98 | 998 | if (ret < 0) { |
88f2b785 MD |
999 | /* |
1000 | * Restart interrupted system call. | |
1001 | */ | |
1002 | if (errno == EINTR) { | |
1003 | goto restart_poll; | |
1004 | } | |
72079cae DG |
1005 | goto error; |
1006 | } | |
1007 | ||
5eb91c98 DG |
1008 | for (i = 0; i < nb_fd; i++) { |
1009 | /* Fetch once the poll data */ | |
1010 | revents = LTTNG_POLL_GETEV(&events, i); | |
1011 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1012 | ||
44a5e5eb DG |
1013 | health_code_update(&consumer_data->health); |
1014 | ||
5eb91c98 DG |
1015 | /* Thread quit pipe has been closed. Killing thread. */ |
1016 | ret = check_thread_quit_pipe(pollfd, revents); | |
1017 | if (ret) { | |
139ac872 MD |
1018 | err = 0; |
1019 | goto exit; | |
5eb91c98 DG |
1020 | } |
1021 | ||
1022 | /* Event on the kconsumerd socket */ | |
1023 | if (pollfd == sock) { | |
1024 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1025 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1026 | goto error; |
1027 | } | |
1028 | } | |
1029 | } | |
1030 | ||
44a5e5eb DG |
1031 | health_code_update(&consumer_data->health); |
1032 | ||
712ea556 | 1033 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1034 | ret = lttcomm_recv_unix_sock(sock, &code, |
1035 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1036 | if (ret <= 0) { |
3bd1e081 | 1037 | ERR("consumer closed the command socket"); |
712ea556 | 1038 | goto error; |
6f61d021 | 1039 | } |
1d4b027a | 1040 | |
3bd1e081 | 1041 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1042 | |
139ac872 | 1043 | exit: |
1d4b027a | 1044 | error: |
5c827ce0 DG |
1045 | /* Immediately set the consumerd state to stopped */ |
1046 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1047 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1048 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1049 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1050 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1051 | } else { | |
1052 | /* Code flow error... */ | |
1053 | assert(0); | |
1054 | } | |
1055 | ||
76d7553f MD |
1056 | if (consumer_data->err_sock >= 0) { |
1057 | ret = close(consumer_data->err_sock); | |
1058 | if (ret) { | |
1059 | PERROR("close"); | |
1060 | } | |
1061 | } | |
1062 | if (consumer_data->cmd_sock >= 0) { | |
1063 | ret = close(consumer_data->cmd_sock); | |
1064 | if (ret) { | |
1065 | PERROR("close"); | |
1066 | } | |
1067 | } | |
1068 | if (sock >= 0) { | |
1069 | ret = close(sock); | |
1070 | if (ret) { | |
1071 | PERROR("close"); | |
1072 | } | |
1073 | } | |
273ea72c | 1074 | |
3bd1e081 MD |
1075 | unlink(consumer_data->err_unix_sock_path); |
1076 | unlink(consumer_data->cmd_unix_sock_path); | |
1077 | consumer_data->pid = 0; | |
1d4b027a | 1078 | |
5eb91c98 | 1079 | lttng_poll_clean(&events); |
76d7553f | 1080 | error_poll: |
139ac872 MD |
1081 | if (err) { |
1082 | health_error(&consumer_data->health); | |
1083 | ERR("Health error occurred in %s", __func__); | |
1084 | } | |
1085 | health_exit(&consumer_data->health); | |
76d7553f | 1086 | DBG("consumer thread cleanup completed"); |
0177d773 | 1087 | |
5eb91c98 | 1088 | return NULL; |
099e26bd DG |
1089 | } |
1090 | ||
099e26bd DG |
1091 | /* |
1092 | * This thread manage application communication. | |
1d4b027a DG |
1093 | */ |
1094 | static void *thread_manage_apps(void *data) | |
099e26bd | 1095 | { |
139ac872 | 1096 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1097 | uint32_t revents, nb_fd; |
099e26bd | 1098 | struct ust_command ust_cmd; |
5eb91c98 | 1099 | struct lttng_poll_event events; |
099e26bd DG |
1100 | |
1101 | DBG("[thread] Manage application started"); | |
1102 | ||
f6a9efaa DG |
1103 | rcu_register_thread(); |
1104 | rcu_thread_online(); | |
1105 | ||
6993eeb3 CB |
1106 | if (testpoint(thread_manage_apps)) { |
1107 | goto error_testpoint; | |
1108 | } | |
1109 | ||
139ac872 | 1110 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1111 | |
5eb91c98 DG |
1112 | ret = create_thread_poll_set(&events, 2); |
1113 | if (ret < 0) { | |
76d7553f | 1114 | goto error_poll_create; |
5eb91c98 | 1115 | } |
099e26bd | 1116 | |
5eb91c98 DG |
1117 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1118 | if (ret < 0) { | |
1119 | goto error; | |
1120 | } | |
099e26bd | 1121 | |
6993eeb3 CB |
1122 | if (testpoint(thread_manage_apps_before_loop)) { |
1123 | goto error; | |
1124 | } | |
8ac94142 | 1125 | |
139ac872 | 1126 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1127 | |
5eb91c98 DG |
1128 | while (1) { |
1129 | /* Zeroed the events structure */ | |
1130 | lttng_poll_reset(&events); | |
0177d773 | 1131 | |
5eb91c98 | 1132 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1133 | |
1134 | DBG("Apps thread polling on %d fds", nb_fd); | |
1135 | ||
1136 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1137 | restart: |
139ac872 | 1138 | health_poll_update(&health_thread_app_manage); |
5eb91c98 | 1139 | ret = lttng_poll_wait(&events, -1); |
139ac872 | 1140 | health_poll_update(&health_thread_app_manage); |
099e26bd | 1141 | if (ret < 0) { |
88f2b785 MD |
1142 | /* |
1143 | * Restart interrupted system call. | |
1144 | */ | |
1145 | if (errno == EINTR) { | |
1146 | goto restart; | |
1147 | } | |
099e26bd DG |
1148 | goto error; |
1149 | } | |
1150 | ||
5eb91c98 DG |
1151 | for (i = 0; i < nb_fd; i++) { |
1152 | /* Fetch once the poll data */ | |
1153 | revents = LTTNG_POLL_GETEV(&events, i); | |
1154 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1155 | ||
139ac872 | 1156 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1157 | |
5eb91c98 DG |
1158 | /* Thread quit pipe has been closed. Killing thread. */ |
1159 | ret = check_thread_quit_pipe(pollfd, revents); | |
1160 | if (ret) { | |
139ac872 MD |
1161 | err = 0; |
1162 | goto exit; | |
5eb91c98 | 1163 | } |
099e26bd | 1164 | |
5eb91c98 DG |
1165 | /* Inspect the apps cmd pipe */ |
1166 | if (pollfd == apps_cmd_pipe[0]) { | |
1167 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1168 | ERR("Apps command pipe error"); | |
0177d773 | 1169 | goto error; |
5eb91c98 DG |
1170 | } else if (revents & LPOLLIN) { |
1171 | /* Empty pipe */ | |
1172 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1173 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1174 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1175 | goto error; |
1176 | } | |
099e26bd | 1177 | |
139ac872 | 1178 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1179 | |
5eb91c98 | 1180 | /* Register applicaton to the session daemon */ |
56fff090 | 1181 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1182 | ust_cmd.sock); |
88ff5b7f | 1183 | if (ret == -ENOMEM) { |
5eb91c98 | 1184 | goto error; |
88ff5b7f MD |
1185 | } else if (ret < 0) { |
1186 | break; | |
5eb91c98 DG |
1187 | } |
1188 | ||
139ac872 | 1189 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1190 | |
acc7b41b | 1191 | /* |
e0c7ec2b | 1192 | * Validate UST version compatibility. |
acc7b41b | 1193 | */ |
e0c7ec2b DG |
1194 | ret = ust_app_validate_version(ust_cmd.sock); |
1195 | if (ret >= 0) { | |
1196 | /* | |
1197 | * Add channel(s) and event(s) to newly registered apps | |
1198 | * from lttng global UST domain. | |
1199 | */ | |
1200 | update_ust_app(ust_cmd.sock); | |
1201 | } | |
acc7b41b | 1202 | |
139ac872 | 1203 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1204 | |
f2ca2e25 | 1205 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1206 | if (ret < 0) { |
1207 | /* | |
1208 | * If the registration is not possible, we simply | |
1209 | * unregister the apps and continue | |
1210 | */ | |
56fff090 | 1211 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1212 | } else { |
1213 | /* | |
622c9ecf DG |
1214 | * We only monitor the error events of the socket. This |
1215 | * thread does not handle any incoming data from UST | |
1216 | * (POLLIN). | |
5eb91c98 | 1217 | */ |
622c9ecf DG |
1218 | ret = lttng_poll_add(&events, ust_cmd.sock, |
1219 | LPOLLERR & LPOLLHUP & LPOLLRDHUP); | |
5eb91c98 DG |
1220 | if (ret < 0) { |
1221 | goto error; | |
1222 | } | |
1223 | ||
ae9e45b3 DG |
1224 | /* Set socket timeout for both receiving and ending */ |
1225 | (void) lttcomm_setsockopt_rcv_timeout(ust_cmd.sock, | |
1226 | app_socket_timeout); | |
1227 | (void) lttcomm_setsockopt_snd_timeout(ust_cmd.sock, | |
1228 | app_socket_timeout); | |
1229 | ||
54d01ffb DG |
1230 | DBG("Apps with sock %d added to poll set", |
1231 | ust_cmd.sock); | |
5eb91c98 | 1232 | } |
487cf67c | 1233 | |
139ac872 | 1234 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1235 | |
5eb91c98 | 1236 | break; |
0177d773 | 1237 | } |
5eb91c98 DG |
1238 | } else { |
1239 | /* | |
54d01ffb DG |
1240 | * At this point, we know that a registered application made |
1241 | * the event at poll_wait. | |
5eb91c98 DG |
1242 | */ |
1243 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1244 | /* Removing from the poll set */ | |
1245 | ret = lttng_poll_del(&events, pollfd); | |
1246 | if (ret < 0) { | |
1247 | goto error; | |
1248 | } | |
099e26bd | 1249 | |
b9d9b220 | 1250 | /* Socket closed on remote end. */ |
56fff090 | 1251 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1252 | break; |
1253 | } | |
099e26bd | 1254 | } |
44a5e5eb | 1255 | |
139ac872 | 1256 | health_code_update(&health_thread_app_manage); |
099e26bd | 1257 | } |
099e26bd DG |
1258 | } |
1259 | ||
139ac872 | 1260 | exit: |
099e26bd | 1261 | error: |
5eb91c98 | 1262 | lttng_poll_clean(&events); |
76d7553f | 1263 | error_poll_create: |
6993eeb3 | 1264 | error_testpoint: |
6620da75 DG |
1265 | utils_close_pipe(apps_cmd_pipe); |
1266 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1267 | ||
1268 | /* | |
1269 | * We don't clean the UST app hash table here since already registered | |
1270 | * applications can still be controlled so let them be until the session | |
1271 | * daemon dies or the applications stop. | |
1272 | */ | |
1273 | ||
139ac872 MD |
1274 | if (err) { |
1275 | health_error(&health_thread_app_manage); | |
1276 | ERR("Health error occurred in %s", __func__); | |
1277 | } | |
1278 | health_exit(&health_thread_app_manage); | |
76d7553f | 1279 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1280 | rcu_thread_offline(); |
1281 | rcu_unregister_thread(); | |
099e26bd DG |
1282 | return NULL; |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | * Dispatch request from the registration threads to the application | |
1287 | * communication thread. | |
1288 | */ | |
1289 | static void *thread_dispatch_ust_registration(void *data) | |
1290 | { | |
1291 | int ret; | |
1292 | struct cds_wfq_node *node; | |
1293 | struct ust_command *ust_cmd = NULL; | |
1294 | ||
1295 | DBG("[thread] Dispatch UST command started"); | |
1296 | ||
26c9d55e | 1297 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
099e26bd DG |
1298 | /* Atomically prepare the queue futex */ |
1299 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1300 | ||
1301 | do { | |
1302 | /* Dequeue command for registration */ | |
1303 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1304 | if (node == NULL) { | |
00a17c97 | 1305 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1306 | /* Continue thread execution */ |
1307 | break; | |
1308 | } | |
1309 | ||
1310 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1311 | ||
2f50c8a3 DG |
1312 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1313 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1314 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1315 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1316 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1317 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1318 | /* |
1319 | * Inform apps thread of the new application registration. This | |
1320 | * call is blocking so we can be assured that the data will be read | |
1321 | * at some point in time or wait to the end of the world :) | |
1322 | */ | |
6620da75 DG |
1323 | if (apps_cmd_pipe[1] >= 0) { |
1324 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1325 | sizeof(struct ust_command)); | |
1326 | if (ret < 0) { | |
1327 | PERROR("write apps cmd pipe"); | |
1328 | if (errno == EBADF) { | |
1329 | /* | |
1330 | * We can't inform the application thread to process | |
1331 | * registration. We will exit or else application | |
1332 | * registration will not occur and tracing will never | |
1333 | * start. | |
1334 | */ | |
1335 | goto error; | |
1336 | } | |
1337 | } | |
1338 | } else { | |
1339 | /* Application manager thread is not available. */ | |
1340 | ret = close(ust_cmd->sock); | |
1341 | if (ret < 0) { | |
1342 | PERROR("close ust_cmd sock"); | |
099e26bd DG |
1343 | } |
1344 | } | |
1345 | free(ust_cmd); | |
1346 | } while (node != NULL); | |
1347 | ||
1348 | /* Futex wait on queue. Blocking call on futex() */ | |
1349 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1350 | } | |
1351 | ||
1352 | error: | |
1353 | DBG("Dispatch thread dying"); | |
1354 | return NULL; | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * This thread manage application registration. | |
1359 | */ | |
1360 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1361 | { |
139ac872 | 1362 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1363 | uint32_t revents, nb_fd; |
1364 | struct lttng_poll_event events; | |
099e26bd DG |
1365 | /* |
1366 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1367 | * freed in the manage apps thread. | |
1368 | */ | |
1369 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1370 | |
099e26bd | 1371 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1372 | |
6993eeb3 CB |
1373 | if (testpoint(thread_registration_apps)) { |
1374 | goto error_testpoint; | |
1375 | } | |
8ac94142 | 1376 | |
1d4b027a DG |
1377 | ret = lttcomm_listen_unix_sock(apps_sock); |
1378 | if (ret < 0) { | |
76d7553f | 1379 | goto error_listen; |
1d4b027a DG |
1380 | } |
1381 | ||
5eb91c98 DG |
1382 | /* |
1383 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1384 | * more will be added to this poll set. | |
1385 | */ | |
1386 | ret = create_thread_poll_set(&events, 2); | |
1387 | if (ret < 0) { | |
76d7553f | 1388 | goto error_create_poll; |
5eb91c98 | 1389 | } |
273ea72c | 1390 | |
5eb91c98 DG |
1391 | /* Add the application registration socket */ |
1392 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1393 | if (ret < 0) { | |
76d7553f | 1394 | goto error_poll_add; |
5eb91c98 | 1395 | } |
273ea72c | 1396 | |
1d4b027a | 1397 | /* Notify all applications to register */ |
0fdd1e2c DG |
1398 | ret = notify_ust_apps(1); |
1399 | if (ret < 0) { | |
1400 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1401 | "Execution continues but there might be problem for already\n" |
1402 | "running applications that wishes to register."); | |
0fdd1e2c | 1403 | } |
1d4b027a DG |
1404 | |
1405 | while (1) { | |
1406 | DBG("Accepting application registration"); | |
273ea72c | 1407 | |
5eb91c98 DG |
1408 | nb_fd = LTTNG_POLL_GETNB(&events); |
1409 | ||
273ea72c | 1410 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1411 | restart: |
139ac872 | 1412 | health_poll_update(&health_thread_app_reg); |
5eb91c98 | 1413 | ret = lttng_poll_wait(&events, -1); |
139ac872 | 1414 | health_poll_update(&health_thread_app_reg); |
273ea72c | 1415 | if (ret < 0) { |
88f2b785 MD |
1416 | /* |
1417 | * Restart interrupted system call. | |
1418 | */ | |
1419 | if (errno == EINTR) { | |
1420 | goto restart; | |
1421 | } | |
273ea72c DG |
1422 | goto error; |
1423 | } | |
1424 | ||
5eb91c98 | 1425 | for (i = 0; i < nb_fd; i++) { |
139ac872 MD |
1426 | health_code_update(&health_thread_app_reg); |
1427 | ||
5eb91c98 DG |
1428 | /* Fetch once the poll data */ |
1429 | revents = LTTNG_POLL_GETEV(&events, i); | |
1430 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1431 | |
5eb91c98 DG |
1432 | /* Thread quit pipe has been closed. Killing thread. */ |
1433 | ret = check_thread_quit_pipe(pollfd, revents); | |
1434 | if (ret) { | |
139ac872 MD |
1435 | err = 0; |
1436 | goto exit; | |
90014c57 | 1437 | } |
1d4b027a | 1438 | |
5eb91c98 DG |
1439 | /* Event on the registration socket */ |
1440 | if (pollfd == apps_sock) { | |
1441 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1442 | ERR("Register apps socket poll error"); | |
1443 | goto error; | |
1444 | } else if (revents & LPOLLIN) { | |
1445 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1446 | if (sock < 0) { | |
1447 | goto error; | |
1448 | } | |
099e26bd | 1449 | |
b662582b DG |
1450 | /* |
1451 | * Set the CLOEXEC flag. Return code is useless because | |
1452 | * either way, the show must go on. | |
1453 | */ | |
1454 | (void) utils_set_fd_cloexec(sock); | |
1455 | ||
5eb91c98 | 1456 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1457 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1458 | if (ust_cmd == NULL) { |
76d7553f | 1459 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1460 | goto error; |
1461 | } | |
1d4b027a | 1462 | |
5eb91c98 DG |
1463 | /* |
1464 | * Using message-based transmissions to ensure we don't | |
1465 | * have to deal with partially received messages. | |
1466 | */ | |
4063050c MD |
1467 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1468 | if (ret < 0) { | |
1469 | ERR("Exhausted file descriptors allowed for applications."); | |
1470 | free(ust_cmd); | |
1471 | ret = close(sock); | |
1472 | if (ret) { | |
1473 | PERROR("close"); | |
1474 | } | |
1475 | sock = -1; | |
1476 | continue; | |
1477 | } | |
139ac872 | 1478 | health_code_update(&health_thread_app_reg); |
5eb91c98 DG |
1479 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1480 | sizeof(struct ust_register_msg)); | |
1481 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1482 | if (ret < 0) { | |
76d7553f | 1483 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1484 | } else { |
1485 | ERR("Wrong size received on apps register"); | |
1486 | } | |
1487 | free(ust_cmd); | |
76d7553f MD |
1488 | ret = close(sock); |
1489 | if (ret) { | |
1490 | PERROR("close"); | |
1491 | } | |
4063050c | 1492 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1493 | sock = -1; |
5eb91c98 DG |
1494 | continue; |
1495 | } | |
139ac872 | 1496 | health_code_update(&health_thread_app_reg); |
099e26bd | 1497 | |
5eb91c98 | 1498 | ust_cmd->sock = sock; |
34a2494f | 1499 | sock = -1; |
099e26bd | 1500 | |
5eb91c98 DG |
1501 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1502 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1503 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1504 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1505 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1506 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1507 | |
5eb91c98 DG |
1508 | /* |
1509 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1510 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1511 | */ |
1512 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1513 | ||
1514 | /* | |
1515 | * Wake the registration queue futex. Implicit memory | |
1516 | * barrier with the exchange in cds_wfq_enqueue. | |
1517 | */ | |
1518 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1519 | } | |
1520 | } | |
90014c57 | 1521 | } |
1d4b027a DG |
1522 | } |
1523 | ||
139ac872 | 1524 | exit: |
1d4b027a | 1525 | error: |
139ac872 MD |
1526 | if (err) { |
1527 | health_error(&health_thread_app_reg); | |
1528 | ERR("Health error occurred in %s", __func__); | |
1529 | } | |
139ac872 | 1530 | |
0fdd1e2c DG |
1531 | /* Notify that the registration thread is gone */ |
1532 | notify_ust_apps(0); | |
1533 | ||
a4b35e07 | 1534 | if (apps_sock >= 0) { |
76d7553f MD |
1535 | ret = close(apps_sock); |
1536 | if (ret) { | |
1537 | PERROR("close"); | |
1538 | } | |
a4b35e07 | 1539 | } |
46c3f085 | 1540 | if (sock >= 0) { |
76d7553f MD |
1541 | ret = close(sock); |
1542 | if (ret) { | |
1543 | PERROR("close"); | |
1544 | } | |
4063050c | 1545 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1546 | } |
273ea72c | 1547 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1548 | |
76d7553f | 1549 | error_poll_add: |
5eb91c98 | 1550 | lttng_poll_clean(&events); |
76d7553f MD |
1551 | error_listen: |
1552 | error_create_poll: | |
6993eeb3 | 1553 | error_testpoint: |
76d7553f | 1554 | DBG("UST Registration thread cleanup complete"); |
152413a0 | 1555 | health_exit(&health_thread_app_reg); |
5eb91c98 | 1556 | |
1d4b027a DG |
1557 | return NULL; |
1558 | } | |
1559 | ||
8c0faa1d | 1560 | /* |
3bd1e081 | 1561 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1562 | * exec or it will fails. |
8c0faa1d | 1563 | */ |
3bd1e081 | 1564 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1565 | { |
a23ec3a7 | 1566 | int ret, clock_ret; |
ee0b0061 DG |
1567 | struct timespec timeout; |
1568 | ||
a23ec3a7 DG |
1569 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1570 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1571 | |
a23ec3a7 DG |
1572 | /* Setup pthread condition */ |
1573 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1574 | if (ret != 0) { | |
1575 | errno = ret; | |
1576 | PERROR("pthread_condattr_init consumer data"); | |
1577 | goto error; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1582 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1583 | * for a more details and how we noticed it. | |
1584 | */ | |
1585 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1586 | if (ret != 0) { | |
1587 | errno = ret; | |
1588 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1589 | goto error; |
1590 | } | |
8c0faa1d | 1591 | |
a23ec3a7 DG |
1592 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1593 | if (ret != 0) { | |
1594 | errno = ret; | |
1595 | PERROR("pthread_cond_init consumer data"); | |
1596 | goto error; | |
1597 | } | |
1598 | ||
1599 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1600 | consumer_data); | |
8c0faa1d | 1601 | if (ret != 0) { |
3bd1e081 | 1602 | PERROR("pthread_create consumer"); |
ee0b0061 | 1603 | ret = -1; |
8c0faa1d DG |
1604 | goto error; |
1605 | } | |
1606 | ||
a23ec3a7 DG |
1607 | /* We are about to wait on a pthread condition */ |
1608 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1609 | ||
ee0b0061 | 1610 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1611 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1612 | /* | |
1613 | * Set the timeout for the condition timed wait even if the clock gettime | |
1614 | * call fails since we might loop on that call and we want to avoid to | |
1615 | * increment the timeout too many times. | |
1616 | */ | |
1617 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1618 | ||
1619 | /* | |
1620 | * The following loop COULD be skipped in some conditions so this is why we | |
1621 | * set ret to 0 in order to make sure at least one round of the loop is | |
1622 | * done. | |
1623 | */ | |
1624 | ret = 0; | |
1625 | ||
1626 | /* | |
1627 | * Loop until the condition is reached or when a timeout is reached. Note | |
1628 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1629 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1630 | * possible. This loop does not take any chances and works with both of | |
1631 | * them. | |
1632 | */ | |
1633 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1634 | if (clock_ret < 0) { | |
1635 | PERROR("clock_gettime spawn consumer"); | |
1636 | /* Infinite wait for the consumerd thread to be ready */ | |
1637 | ret = pthread_cond_wait(&consumer_data->cond, | |
1638 | &consumer_data->cond_mutex); | |
1639 | } else { | |
1640 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1641 | &consumer_data->cond_mutex, &timeout); | |
1642 | } | |
ee0b0061 | 1643 | } |
8c0faa1d | 1644 | |
a23ec3a7 DG |
1645 | /* Release the pthread condition */ |
1646 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1647 | ||
1648 | if (ret != 0) { | |
1649 | errno = ret; | |
1650 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1651 | /* |
1652 | * Call has timed out so we kill the kconsumerd_thread and return | |
1653 | * an error. | |
1654 | */ | |
a23ec3a7 DG |
1655 | ERR("Condition timed out. The consumer thread was never ready." |
1656 | " Killing it"); | |
3bd1e081 | 1657 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1658 | if (ret < 0) { |
3bd1e081 | 1659 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1660 | } |
1661 | } else { | |
a23ec3a7 | 1662 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1663 | } |
1664 | goto error; | |
1665 | } | |
1666 | ||
3bd1e081 MD |
1667 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1668 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 1669 | ERR("Consumerd did not start"); |
3bd1e081 | 1670 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1671 | goto error; |
1672 | } | |
3bd1e081 | 1673 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1674 | |
8c0faa1d DG |
1675 | return 0; |
1676 | ||
1677 | error: | |
1678 | return ret; | |
1679 | } | |
1680 | ||
d9800920 | 1681 | /* |
3bd1e081 | 1682 | * Join consumer thread |
d9800920 | 1683 | */ |
3bd1e081 | 1684 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1685 | { |
1686 | void *status; | |
1687 | int ret; | |
1688 | ||
e8209f6b DG |
1689 | /* Consumer pid must be a real one. */ |
1690 | if (consumer_data->pid > 0) { | |
3bd1e081 | 1691 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 1692 | if (ret) { |
3bd1e081 | 1693 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1694 | return ret; |
1695 | } | |
3bd1e081 | 1696 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1697 | } else { |
1698 | return 0; | |
1699 | } | |
1700 | } | |
1701 | ||
8c0faa1d | 1702 | /* |
3bd1e081 | 1703 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1704 | * |
d063d709 | 1705 | * Return pid if successful else -1. |
8c0faa1d | 1706 | */ |
3bd1e081 | 1707 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1708 | { |
1709 | int ret; | |
1710 | pid_t pid; | |
94c55f17 | 1711 | const char *consumer_to_use; |
53086306 | 1712 | const char *verbosity; |
94c55f17 | 1713 | struct stat st; |
8c0faa1d | 1714 | |
3bd1e081 | 1715 | DBG("Spawning consumerd"); |
c49dc785 | 1716 | |
8c0faa1d DG |
1717 | pid = fork(); |
1718 | if (pid == 0) { | |
1719 | /* | |
3bd1e081 | 1720 | * Exec consumerd. |
8c0faa1d | 1721 | */ |
daee5345 | 1722 | if (opt_verbose_consumer) { |
53086306 DG |
1723 | verbosity = "--verbose"; |
1724 | } else { | |
1725 | verbosity = "--quiet"; | |
1726 | } | |
3bd1e081 MD |
1727 | switch (consumer_data->type) { |
1728 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1729 | /* |
c7704d57 DG |
1730 | * Find out which consumerd to execute. We will first try the |
1731 | * 64-bit path, then the sessiond's installation directory, and | |
1732 | * fallback on the 32-bit one, | |
94c55f17 | 1733 | */ |
63a799e8 AM |
1734 | DBG3("Looking for a kernel consumer at these locations:"); |
1735 | DBG3(" 1) %s", consumerd64_bin); | |
1736 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1737 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1738 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1739 | DBG3("Found location #1"); |
94c55f17 | 1740 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1741 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1742 | DBG3("Found location #2"); |
94c55f17 | 1743 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1744 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1745 | DBG3("Found location #3"); |
eb1e0bd4 | 1746 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1747 | } else { |
63a799e8 | 1748 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1749 | break; |
1750 | } | |
1751 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1752 | execl(consumer_to_use, | |
1753 | "lttng-consumerd", verbosity, "-k", | |
1754 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1755 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1756 | NULL); | |
3bd1e081 | 1757 | break; |
7753dea8 MD |
1758 | case LTTNG_CONSUMER64_UST: |
1759 | { | |
b1e0b6b6 | 1760 | char *tmpnew = NULL; |
8f4905da MD |
1761 | |
1762 | if (consumerd64_libdir[0] != '\0') { | |
1763 | char *tmp; | |
1764 | size_t tmplen; | |
1765 | ||
1766 | tmp = getenv("LD_LIBRARY_PATH"); | |
1767 | if (!tmp) { | |
1768 | tmp = ""; | |
1769 | } | |
1770 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1771 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1772 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1773 | if (!tmpnew) { | |
1774 | ret = -ENOMEM; | |
1775 | goto error; | |
1776 | } | |
1777 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1778 | strcat(tmpnew, consumerd64_libdir); | |
1779 | if (tmp[0] != '\0') { | |
1780 | strcat(tmpnew, ":"); | |
1781 | strcat(tmpnew, tmp); | |
1782 | } | |
1783 | ret = putenv(tmpnew); | |
1784 | if (ret) { | |
1785 | ret = -errno; | |
1786 | goto error; | |
1787 | } | |
1788 | } | |
94c55f17 | 1789 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1790 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1791 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1792 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1793 | NULL); | |
8f4905da MD |
1794 | if (consumerd64_libdir[0] != '\0') { |
1795 | free(tmpnew); | |
1796 | } | |
1797 | if (ret) { | |
1798 | goto error; | |
1799 | } | |
3bd1e081 | 1800 | break; |
7753dea8 MD |
1801 | } |
1802 | case LTTNG_CONSUMER32_UST: | |
1803 | { | |
937dde8e | 1804 | char *tmpnew = NULL; |
8f4905da MD |
1805 | |
1806 | if (consumerd32_libdir[0] != '\0') { | |
1807 | char *tmp; | |
1808 | size_t tmplen; | |
1809 | ||
1810 | tmp = getenv("LD_LIBRARY_PATH"); | |
1811 | if (!tmp) { | |
1812 | tmp = ""; | |
1813 | } | |
1814 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1815 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1816 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1817 | if (!tmpnew) { | |
1818 | ret = -ENOMEM; | |
1819 | goto error; | |
1820 | } | |
1821 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1822 | strcat(tmpnew, consumerd32_libdir); | |
1823 | if (tmp[0] != '\0') { | |
1824 | strcat(tmpnew, ":"); | |
1825 | strcat(tmpnew, tmp); | |
1826 | } | |
1827 | ret = putenv(tmpnew); | |
1828 | if (ret) { | |
1829 | ret = -errno; | |
1830 | goto error; | |
1831 | } | |
1832 | } | |
94c55f17 | 1833 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1834 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1835 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1836 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1837 | NULL); | |
8f4905da MD |
1838 | if (consumerd32_libdir[0] != '\0') { |
1839 | free(tmpnew); | |
1840 | } | |
1841 | if (ret) { | |
1842 | goto error; | |
1843 | } | |
7753dea8 MD |
1844 | break; |
1845 | } | |
3bd1e081 | 1846 | default: |
76d7553f | 1847 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1848 | exit(EXIT_FAILURE); |
1849 | } | |
8c0faa1d | 1850 | if (errno != 0) { |
76d7553f | 1851 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1852 | } |
1853 | exit(EXIT_FAILURE); | |
1854 | } else if (pid > 0) { | |
1855 | ret = pid; | |
8c0faa1d | 1856 | } else { |
76d7553f | 1857 | PERROR("start consumer fork"); |
8c0faa1d | 1858 | ret = -errno; |
8c0faa1d | 1859 | } |
8f4905da | 1860 | error: |
8c0faa1d DG |
1861 | return ret; |
1862 | } | |
1863 | ||
693bd40b | 1864 | /* |
3bd1e081 | 1865 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1866 | */ |
3bd1e081 | 1867 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 1868 | { |
edb8b045 DG |
1869 | int ret, err; |
1870 | ||
1871 | /* | |
1872 | * Set the listen() state on the socket since there is a possible race | |
1873 | * between the exec() of the consumer daemon and this call if place in the | |
1874 | * consumer thread. See bug #366 for more details. | |
1875 | */ | |
1876 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
1877 | if (ret < 0) { | |
1878 | goto error; | |
1879 | } | |
693bd40b | 1880 | |
3bd1e081 MD |
1881 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1882 | if (consumer_data->pid != 0) { | |
1883 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1884 | goto end; |
1885 | } | |
693bd40b | 1886 | |
3bd1e081 | 1887 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1888 | if (ret < 0) { |
3bd1e081 MD |
1889 | ERR("Spawning consumerd failed"); |
1890 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1891 | goto error; |
693bd40b | 1892 | } |
c49dc785 | 1893 | |
3bd1e081 MD |
1894 | /* Setting up the consumer_data pid */ |
1895 | consumer_data->pid = ret; | |
48842b30 | 1896 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1897 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1898 | |
3bd1e081 MD |
1899 | DBG2("Spawning consumer control thread"); |
1900 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1901 | if (ret < 0) { |
3bd1e081 | 1902 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1903 | goto error; |
1904 | } | |
1905 | ||
c49dc785 | 1906 | end: |
693bd40b DG |
1907 | return 0; |
1908 | ||
1909 | error: | |
edb8b045 DG |
1910 | /* Cleanup already created socket on error. */ |
1911 | if (consumer_data->err_sock >= 0) { | |
1912 | err = close(consumer_data->err_sock); | |
1913 | if (err < 0) { | |
1914 | PERROR("close consumer data error socket"); | |
1915 | } | |
1916 | } | |
693bd40b DG |
1917 | return ret; |
1918 | } | |
1919 | ||
44a5e5eb | 1920 | /* |
139ac872 MD |
1921 | * Compute health status of each consumer. If one of them is zero (bad |
1922 | * state), we return 0. | |
44a5e5eb DG |
1923 | */ |
1924 | static int check_consumer_health(void) | |
1925 | { | |
1926 | int ret; | |
1927 | ||
139ac872 MD |
1928 | ret = health_check_state(&kconsumer_data.health) && |
1929 | health_check_state(&ustconsumer32_data.health) && | |
44a5e5eb DG |
1930 | health_check_state(&ustconsumer64_data.health); |
1931 | ||
1932 | DBG3("Health consumer check %d", ret); | |
1933 | ||
1934 | return ret; | |
1935 | } | |
1936 | ||
b73401da | 1937 | /* |
096102bd | 1938 | * Setup necessary data for kernel tracer action. |
b73401da | 1939 | */ |
096102bd | 1940 | static int init_kernel_tracer(void) |
b73401da DG |
1941 | { |
1942 | int ret; | |
b73401da | 1943 | |
096102bd DG |
1944 | /* Modprobe lttng kernel modules */ |
1945 | ret = modprobe_lttng_control(); | |
b73401da | 1946 | if (ret < 0) { |
b73401da DG |
1947 | goto error; |
1948 | } | |
1949 | ||
096102bd DG |
1950 | /* Open debugfs lttng */ |
1951 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1952 | if (kernel_tracer_fd < 0) { | |
1953 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
1954 | ret = -1; |
1955 | goto error_open; | |
54d01ffb DG |
1956 | } |
1957 | ||
2f77fc4b DG |
1958 | /* Validate kernel version */ |
1959 | ret = kernel_validate_version(kernel_tracer_fd); | |
1960 | if (ret < 0) { | |
1961 | goto error_version; | |
b551a063 | 1962 | } |
54d01ffb | 1963 | |
2f77fc4b DG |
1964 | ret = modprobe_lttng_data(); |
1965 | if (ret < 0) { | |
1966 | goto error_modules; | |
54d01ffb DG |
1967 | } |
1968 | ||
2f77fc4b DG |
1969 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
1970 | return 0; | |
1971 | ||
1972 | error_version: | |
1973 | modprobe_remove_lttng_control(); | |
1974 | ret = close(kernel_tracer_fd); | |
1975 | if (ret) { | |
1976 | PERROR("close"); | |
b551a063 | 1977 | } |
2f77fc4b | 1978 | kernel_tracer_fd = -1; |
f73fabfd | 1979 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 1980 | |
2f77fc4b DG |
1981 | error_modules: |
1982 | ret = close(kernel_tracer_fd); | |
1983 | if (ret) { | |
1984 | PERROR("close"); | |
b551a063 | 1985 | } |
54d01ffb | 1986 | |
2f77fc4b DG |
1987 | error_open: |
1988 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
1989 | |
1990 | error: | |
2f77fc4b DG |
1991 | WARN("No kernel tracer available"); |
1992 | kernel_tracer_fd = -1; | |
1993 | if (!is_root) { | |
f73fabfd | 1994 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 1995 | } else { |
f73fabfd | 1996 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 1997 | } |
54d01ffb DG |
1998 | } |
1999 | ||
2f77fc4b | 2000 | |
54d01ffb | 2001 | /* |
2f77fc4b DG |
2002 | * Copy consumer output from the tracing session to the domain session. The |
2003 | * function also applies the right modification on a per domain basis for the | |
2004 | * trace files destination directory. | |
54d01ffb | 2005 | */ |
2f77fc4b | 2006 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2007 | { |
2008 | int ret; | |
2f77fc4b DG |
2009 | const char *dir_name; |
2010 | struct consumer_output *consumer; | |
2011 | ||
2012 | assert(session); | |
2013 | assert(session->consumer); | |
54d01ffb | 2014 | |
b551a063 DG |
2015 | switch (domain) { |
2016 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2017 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2018 | /* |
2019 | * XXX: We should audit the session creation and what this function | |
2020 | * does "extra" in order to avoid a destroy since this function is used | |
2021 | * in the domain session creation (kernel and ust) only. Same for UST | |
2022 | * domain. | |
2023 | */ | |
2024 | if (session->kernel_session->consumer) { | |
2025 | consumer_destroy_output(session->kernel_session->consumer); | |
2026 | } | |
2f77fc4b DG |
2027 | session->kernel_session->consumer = |
2028 | consumer_copy_output(session->consumer); | |
2029 | /* Ease our life a bit for the next part */ | |
2030 | consumer = session->kernel_session->consumer; | |
2031 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2032 | break; |
2033 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2034 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2035 | if (session->ust_session->consumer) { |
2036 | consumer_destroy_output(session->ust_session->consumer); | |
2037 | } | |
2f77fc4b DG |
2038 | session->ust_session->consumer = |
2039 | consumer_copy_output(session->consumer); | |
2040 | /* Ease our life a bit for the next part */ | |
2041 | consumer = session->ust_session->consumer; | |
2042 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2043 | break; |
2044 | default: | |
f73fabfd | 2045 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2046 | goto error; |
2047 | } | |
2048 | ||
2f77fc4b | 2049 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2050 | strncat(consumer->subdir, dir_name, |
2051 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2052 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2053 | ||
f73fabfd | 2054 | ret = LTTNG_OK; |
54d01ffb DG |
2055 | |
2056 | error: | |
2057 | return ret; | |
2058 | } | |
2059 | ||
00e2e675 | 2060 | /* |
2f77fc4b | 2061 | * Create an UST session and add it to the session ust list. |
00e2e675 | 2062 | */ |
2f77fc4b DG |
2063 | static int create_ust_session(struct ltt_session *session, |
2064 | struct lttng_domain *domain) | |
00e2e675 DG |
2065 | { |
2066 | int ret; | |
2f77fc4b | 2067 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2068 | |
a4b92340 | 2069 | assert(session); |
2f77fc4b DG |
2070 | assert(domain); |
2071 | assert(session->consumer); | |
a4b92340 | 2072 | |
2f77fc4b DG |
2073 | switch (domain->type) { |
2074 | case LTTNG_DOMAIN_UST: | |
2075 | break; | |
2076 | default: | |
2077 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2078 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2079 | goto error; |
2080 | } | |
2081 | ||
2f77fc4b DG |
2082 | DBG("Creating UST session"); |
2083 | ||
2084 | lus = trace_ust_create_session(session->path, session->id, domain); | |
2085 | if (lus == NULL) { | |
f73fabfd | 2086 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2087 | goto error; |
2088 | } | |
2089 | ||
2f77fc4b DG |
2090 | lus->uid = session->uid; |
2091 | lus->gid = session->gid; | |
2092 | session->ust_session = lus; | |
00e2e675 | 2093 | |
2f77fc4b DG |
2094 | /* Copy session output to the newly created UST session */ |
2095 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2096 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2097 | goto error; |
2098 | } | |
2099 | ||
f73fabfd | 2100 | return LTTNG_OK; |
00e2e675 DG |
2101 | |
2102 | error: | |
2f77fc4b DG |
2103 | free(lus); |
2104 | session->ust_session = NULL; | |
00e2e675 DG |
2105 | return ret; |
2106 | } | |
2107 | ||
2108 | /* | |
2f77fc4b | 2109 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2110 | */ |
2f77fc4b | 2111 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2112 | { |
2113 | int ret; | |
a4b92340 | 2114 | |
2f77fc4b | 2115 | DBG("Creating kernel session"); |
00e2e675 | 2116 | |
2f77fc4b DG |
2117 | ret = kernel_create_session(session, kernel_tracer_fd); |
2118 | if (ret < 0) { | |
f73fabfd | 2119 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2120 | goto error; |
2121 | } | |
2122 | ||
2f77fc4b DG |
2123 | /* Code flow safety */ |
2124 | assert(session->kernel_session); | |
2125 | ||
2126 | /* Copy session output to the newly created Kernel session */ | |
2127 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2128 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2129 | goto error; |
2130 | } | |
2131 | ||
2f77fc4b DG |
2132 | /* Create directory(ies) on local filesystem. */ |
2133 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2134 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2135 | ret = run_as_mkdir_recursive( | |
2136 | session->kernel_session->consumer->dst.trace_path, | |
2137 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2138 | if (ret < 0) { | |
2139 | if (ret != -EEXIST) { | |
2140 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2141 | goto error; |
2142 | } | |
00e2e675 | 2143 | } |
2f77fc4b | 2144 | } |
00e2e675 | 2145 | |
2f77fc4b DG |
2146 | session->kernel_session->uid = session->uid; |
2147 | session->kernel_session->gid = session->gid; | |
00e2e675 | 2148 | |
f73fabfd | 2149 | return LTTNG_OK; |
00e2e675 | 2150 | |
2f77fc4b DG |
2151 | error: |
2152 | trace_kernel_destroy_session(session->kernel_session); | |
2153 | session->kernel_session = NULL; | |
2154 | return ret; | |
2155 | } | |
00e2e675 | 2156 | |
2f77fc4b DG |
2157 | /* |
2158 | * Count number of session permitted by uid/gid. | |
2159 | */ | |
2160 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2161 | { | |
2162 | unsigned int i = 0; | |
2163 | struct ltt_session *session; | |
07424f16 | 2164 | |
2f77fc4b DG |
2165 | DBG("Counting number of available session for UID %d GID %d", |
2166 | uid, gid); | |
2167 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2168 | /* |
2f77fc4b | 2169 | * Only list the sessions the user can control. |
00e2e675 | 2170 | */ |
2f77fc4b DG |
2171 | if (!session_access_ok(session, uid, gid)) { |
2172 | continue; | |
2173 | } | |
2174 | i++; | |
a4b92340 | 2175 | } |
2f77fc4b | 2176 | return i; |
00e2e675 DG |
2177 | } |
2178 | ||
54d01ffb DG |
2179 | /* |
2180 | * Process the command requested by the lttng client within the command | |
2181 | * context structure. This function make sure that the return structure (llm) | |
2182 | * is set and ready for transmission before returning. | |
2183 | * | |
2184 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2185 | * |
2186 | * "sock" is only used for special-case var. len data. | |
54d01ffb | 2187 | */ |
53a80697 MD |
2188 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2189 | int *sock_error) | |
54d01ffb | 2190 | { |
f73fabfd | 2191 | int ret = LTTNG_OK; |
44d3bd01 | 2192 | int need_tracing_session = 1; |
2e09ba09 | 2193 | int need_domain; |
54d01ffb DG |
2194 | |
2195 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2196 | ||
53a80697 MD |
2197 | *sock_error = 0; |
2198 | ||
2e09ba09 MD |
2199 | switch (cmd_ctx->lsm->cmd_type) { |
2200 | case LTTNG_CREATE_SESSION: | |
2201 | case LTTNG_DESTROY_SESSION: | |
2202 | case LTTNG_LIST_SESSIONS: | |
2203 | case LTTNG_LIST_DOMAINS: | |
2204 | case LTTNG_START_TRACE: | |
2205 | case LTTNG_STOP_TRACE: | |
6d805429 | 2206 | case LTTNG_DATA_PENDING: |
2e09ba09 | 2207 | need_domain = 0; |
3aace903 | 2208 | break; |
2e09ba09 MD |
2209 | default: |
2210 | need_domain = 1; | |
2211 | } | |
2212 | ||
2213 | if (opt_no_kernel && need_domain | |
2214 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2215 | if (!is_root) { |
f73fabfd | 2216 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2217 | } else { |
f73fabfd | 2218 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2219 | } |
4fba7219 DG |
2220 | goto error; |
2221 | } | |
2222 | ||
8d3113b2 DG |
2223 | /* Deny register consumer if we already have a spawned consumer. */ |
2224 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2225 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2226 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2227 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2228 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2229 | goto error; |
2230 | } | |
2231 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2232 | } | |
2233 | ||
54d01ffb DG |
2234 | /* |
2235 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2236 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2237 | * command. |
2238 | */ | |
2239 | switch(cmd_ctx->lsm->cmd_type) { | |
2240 | case LTTNG_LIST_SESSIONS: | |
2241 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2242 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2243 | case LTTNG_LIST_DOMAINS: |
2244 | case LTTNG_LIST_CHANNELS: | |
2245 | case LTTNG_LIST_EVENTS: | |
2246 | break; | |
2247 | default: | |
2248 | /* Setup lttng message with no payload */ | |
2249 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2250 | if (ret < 0) { | |
2251 | /* This label does not try to unlock the session */ | |
2252 | goto init_setup_error; | |
2253 | } | |
2254 | } | |
2255 | ||
2256 | /* Commands that DO NOT need a session. */ | |
2257 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2258 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 2259 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2260 | case LTTNG_LIST_SESSIONS: |
2261 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2262 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2263 | need_tracing_session = 0; |
54d01ffb DG |
2264 | break; |
2265 | default: | |
2266 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2267 | /* |
2268 | * We keep the session list lock across _all_ commands | |
2269 | * for now, because the per-session lock does not | |
2270 | * handle teardown properly. | |
2271 | */ | |
74babd95 | 2272 | session_lock_list(); |
54d01ffb DG |
2273 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2274 | if (cmd_ctx->session == NULL) { | |
2275 | if (cmd_ctx->lsm->session.name != NULL) { | |
f73fabfd | 2276 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2277 | } else { |
2278 | /* If no session name specified */ | |
f73fabfd | 2279 | ret = LTTNG_ERR_SELECT_SESS; |
54d01ffb DG |
2280 | } |
2281 | goto error; | |
2282 | } else { | |
2283 | /* Acquire lock for the session */ | |
2284 | session_lock(cmd_ctx->session); | |
2285 | } | |
2286 | break; | |
2287 | } | |
b389abbe | 2288 | |
2e09ba09 MD |
2289 | if (!need_domain) { |
2290 | goto skip_domain; | |
2291 | } | |
a4b92340 | 2292 | |
54d01ffb DG |
2293 | /* |
2294 | * Check domain type for specific "pre-action". | |
2295 | */ | |
2296 | switch (cmd_ctx->lsm->domain.type) { | |
2297 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2298 | if (!is_root) { |
f73fabfd | 2299 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2300 | goto error; |
2301 | } | |
2302 | ||
54d01ffb | 2303 | /* Kernel tracer check */ |
a4b35e07 | 2304 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2305 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2306 | ret = init_kernel_tracer(); |
2307 | if (ret != 0) { | |
54d01ffb DG |
2308 | goto error; |
2309 | } | |
2310 | } | |
5eb91c98 | 2311 | |
5c827ce0 DG |
2312 | /* Consumer is in an ERROR state. Report back to client */ |
2313 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2314 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2315 | goto error; |
2316 | } | |
2317 | ||
54d01ffb | 2318 | /* Need a session for kernel command */ |
44d3bd01 | 2319 | if (need_tracing_session) { |
54d01ffb | 2320 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2321 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2322 | if (ret < 0) { |
f73fabfd | 2323 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2324 | goto error; |
2325 | } | |
b389abbe | 2326 | } |
7d29a247 | 2327 | |
54d01ffb | 2328 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2329 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2330 | if (kconsumer_data.pid == 0 && | |
a4b92340 DG |
2331 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2332 | cmd_ctx->session->start_consumer) { | |
3bd1e081 MD |
2333 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2334 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2335 | if (ret < 0) { |
f73fabfd | 2336 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2337 | goto error; |
950131af | 2338 | } |
5c827ce0 | 2339 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2340 | } else { |
2341 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2342 | } |
173af62f | 2343 | |
a4b92340 DG |
2344 | /* |
2345 | * The consumer was just spawned so we need to add the socket to | |
2346 | * the consumer output of the session if exist. | |
2347 | */ | |
2348 | ret = consumer_create_socket(&kconsumer_data, | |
2349 | cmd_ctx->session->kernel_session->consumer); | |
2350 | if (ret < 0) { | |
2351 | goto error; | |
173af62f | 2352 | } |
0d0c377a | 2353 | } |
5c827ce0 | 2354 | |
54d01ffb | 2355 | break; |
2bdd86d4 | 2356 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2357 | { |
5c827ce0 DG |
2358 | /* Consumer is in an ERROR state. Report back to client */ |
2359 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2360 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2361 | goto error; |
2362 | } | |
2363 | ||
44d3bd01 | 2364 | if (need_tracing_session) { |
a4b92340 | 2365 | /* Create UST session if none exist. */ |
f6a9efaa | 2366 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2367 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2368 | &cmd_ctx->lsm->domain); |
f73fabfd | 2369 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2370 | goto error; |
2371 | } | |
2372 | } | |
00e2e675 | 2373 | |
7753dea8 MD |
2374 | /* Start the UST consumer daemons */ |
2375 | /* 64-bit */ | |
2376 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2377 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2378 | ustconsumer64_data.pid == 0 && |
a4b92340 DG |
2379 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2380 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2381 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2382 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2383 | if (ret < 0) { |
f73fabfd | 2384 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2385 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2386 | goto error; |
2387 | } | |
48842b30 | 2388 | |
173af62f | 2389 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2390 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2391 | } else { |
7753dea8 MD |
2392 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2393 | } | |
173af62f DG |
2394 | |
2395 | /* | |
2396 | * Setup socket for consumer 64 bit. No need for atomic access | |
2397 | * since it was set above and can ONLY be set in this thread. | |
2398 | */ | |
a4b92340 DG |
2399 | ret = consumer_create_socket(&ustconsumer64_data, |
2400 | cmd_ctx->session->ust_session->consumer); | |
2401 | if (ret < 0) { | |
2402 | goto error; | |
173af62f DG |
2403 | } |
2404 | ||
7753dea8 | 2405 | /* 32-bit */ |
fc7a59ce | 2406 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2407 | ustconsumer32_data.pid == 0 && |
a4b92340 DG |
2408 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2409 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2410 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2411 | ret = start_consumerd(&ustconsumer32_data); | |
2412 | if (ret < 0) { | |
f73fabfd | 2413 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2414 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2415 | goto error; |
2416 | } | |
5c827ce0 | 2417 | |
173af62f | 2418 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2419 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2420 | } else { |
2421 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2422 | } |
173af62f DG |
2423 | |
2424 | /* | |
2425 | * Setup socket for consumer 64 bit. No need for atomic access | |
2426 | * since it was set above and can ONLY be set in this thread. | |
2427 | */ | |
a4b92340 DG |
2428 | ret = consumer_create_socket(&ustconsumer32_data, |
2429 | cmd_ctx->session->ust_session->consumer); | |
2430 | if (ret < 0) { | |
2431 | goto error; | |
173af62f | 2432 | } |
44d3bd01 DG |
2433 | } |
2434 | break; | |
48842b30 | 2435 | } |
54d01ffb | 2436 | default: |
54d01ffb DG |
2437 | break; |
2438 | } | |
2e09ba09 | 2439 | skip_domain: |
33a2b854 | 2440 | |
5c827ce0 DG |
2441 | /* Validate consumer daemon state when start/stop trace command */ |
2442 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2443 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2444 | switch (cmd_ctx->lsm->domain.type) { | |
2445 | case LTTNG_DOMAIN_UST: | |
2446 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2447 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2448 | goto error; |
2449 | } | |
2450 | break; | |
2451 | case LTTNG_DOMAIN_KERNEL: | |
2452 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2453 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2454 | goto error; |
2455 | } | |
2456 | break; | |
2457 | } | |
2458 | } | |
2459 | ||
8e0af1b4 MD |
2460 | /* |
2461 | * Check that the UID or GID match that of the tracing session. | |
2462 | * The root user can interact with all sessions. | |
2463 | */ | |
2464 | if (need_tracing_session) { | |
2465 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2466 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2467 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2468 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2469 | goto error; |
2470 | } | |
2471 | } | |
2472 | ||
54d01ffb DG |
2473 | /* Process by command type */ |
2474 | switch (cmd_ctx->lsm->cmd_type) { | |
2475 | case LTTNG_ADD_CONTEXT: | |
2476 | { | |
2477 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2478 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2479 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2480 | break; |
2481 | } | |
2482 | case LTTNG_DISABLE_CHANNEL: | |
2483 | { | |
2484 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2485 | cmd_ctx->lsm->u.disable.channel_name); | |
2486 | break; | |
2487 | } | |
2488 | case LTTNG_DISABLE_EVENT: | |
2489 | { | |
2490 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2491 | cmd_ctx->lsm->u.disable.channel_name, | |
2492 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2493 | break; |
2494 | } | |
54d01ffb DG |
2495 | case LTTNG_DISABLE_ALL_EVENT: |
2496 | { | |
2bdd86d4 | 2497 | DBG("Disabling all events"); |
54d01ffb DG |
2498 | |
2499 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2500 | cmd_ctx->lsm->u.disable.channel_name); | |
2501 | break; | |
2502 | } | |
00e2e675 DG |
2503 | case LTTNG_DISABLE_CONSUMER: |
2504 | { | |
2505 | ret = cmd_disable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); | |
2506 | break; | |
2507 | } | |
54d01ffb DG |
2508 | case LTTNG_ENABLE_CHANNEL: |
2509 | { | |
aea829b3 | 2510 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2511 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2512 | break; |
2513 | } | |
00e2e675 DG |
2514 | case LTTNG_ENABLE_CONSUMER: |
2515 | { | |
a4b92340 DG |
2516 | /* |
2517 | * XXX: 0 means that this URI should be applied on the session. Should | |
2518 | * be a DOMAIN enuam. | |
2519 | */ | |
00e2e675 | 2520 | ret = cmd_enable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); |
f73fabfd | 2521 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2522 | goto error; |
2523 | } | |
2524 | ||
2525 | if (cmd_ctx->lsm->domain.type == 0) { | |
2526 | /* Add the URI for the UST session if a consumer is present. */ | |
2527 | if (cmd_ctx->session->ust_session && | |
2528 | cmd_ctx->session->ust_session->consumer) { | |
2529 | ret = cmd_enable_consumer(LTTNG_DOMAIN_UST, cmd_ctx->session); | |
2530 | } else if (cmd_ctx->session->kernel_session && | |
2531 | cmd_ctx->session->kernel_session->consumer) { | |
2532 | ret = cmd_enable_consumer(LTTNG_DOMAIN_KERNEL, | |
2533 | cmd_ctx->session); | |
2534 | } | |
2535 | } | |
00e2e675 DG |
2536 | break; |
2537 | } | |
54d01ffb DG |
2538 | case LTTNG_ENABLE_EVENT: |
2539 | { | |
2540 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2541 | cmd_ctx->lsm->u.enable.channel_name, | |
025faf73 | 2542 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2543 | break; |
2544 | } | |
2545 | case LTTNG_ENABLE_ALL_EVENT: | |
2546 | { | |
2bdd86d4 | 2547 | DBG("Enabling all events"); |
54d01ffb DG |
2548 | |
2549 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 | 2550 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2551 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2552 | break; |
2553 | } | |
052da939 | 2554 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2555 | { |
9f19cc17 | 2556 | struct lttng_event *events; |
54d01ffb | 2557 | ssize_t nb_events; |
052da939 | 2558 | |
54d01ffb DG |
2559 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2560 | if (nb_events < 0) { | |
f73fabfd | 2561 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2562 | ret = -nb_events; |
2563 | goto error; | |
2ef84c95 DG |
2564 | } |
2565 | ||
2566 | /* | |
2567 | * Setup lttng message with payload size set to the event list size in | |
2568 | * bytes and then copy list into the llm payload. | |
2569 | */ | |
052da939 | 2570 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2571 | if (ret < 0) { |
052da939 | 2572 | free(events); |
2ef84c95 DG |
2573 | goto setup_error; |
2574 | } | |
2575 | ||
2576 | /* Copy event list into message payload */ | |
9f19cc17 | 2577 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2578 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2579 | |
9f19cc17 | 2580 | free(events); |
2ef84c95 | 2581 | |
f73fabfd | 2582 | ret = LTTNG_OK; |
2ef84c95 DG |
2583 | break; |
2584 | } | |
f37d259d MD |
2585 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2586 | { | |
2587 | struct lttng_event_field *fields; | |
2588 | ssize_t nb_fields; | |
2589 | ||
a4b92340 DG |
2590 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2591 | &fields); | |
f37d259d | 2592 | if (nb_fields < 0) { |
f73fabfd | 2593 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2594 | ret = -nb_fields; |
2595 | goto error; | |
2596 | } | |
2597 | ||
2598 | /* | |
2599 | * Setup lttng message with payload size set to the event list size in | |
2600 | * bytes and then copy list into the llm payload. | |
2601 | */ | |
a4b92340 DG |
2602 | ret = setup_lttng_msg(cmd_ctx, |
2603 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2604 | if (ret < 0) { |
2605 | free(fields); | |
2606 | goto setup_error; | |
2607 | } | |
2608 | ||
2609 | /* Copy event list into message payload */ | |
2610 | memcpy(cmd_ctx->llm->payload, fields, | |
2611 | sizeof(struct lttng_event_field) * nb_fields); | |
2612 | ||
2613 | free(fields); | |
2614 | ||
f73fabfd | 2615 | ret = LTTNG_OK; |
f37d259d MD |
2616 | break; |
2617 | } | |
00e2e675 DG |
2618 | case LTTNG_SET_CONSUMER_URI: |
2619 | { | |
a4b92340 DG |
2620 | size_t nb_uri, len; |
2621 | struct lttng_uri *uris; | |
2622 | ||
2623 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2624 | len = nb_uri * sizeof(struct lttng_uri); | |
2625 | ||
2626 | if (nb_uri == 0) { | |
f73fabfd | 2627 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2628 | goto error; |
2629 | } | |
2630 | ||
2631 | uris = zmalloc(len); | |
2632 | if (uris == NULL) { | |
f73fabfd | 2633 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2634 | goto error; |
2635 | } | |
2636 | ||
2637 | /* Receive variable len data */ | |
77c7c900 | 2638 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2639 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2640 | if (ret <= 0) { | |
2641 | DBG("No URIs received from client... continuing"); | |
2642 | *sock_error = 1; | |
f73fabfd | 2643 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2644 | free(uris); |
a4b92340 DG |
2645 | goto error; |
2646 | } | |
2647 | ||
00e2e675 | 2648 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2649 | nb_uri, uris); |
f73fabfd | 2650 | if (ret != LTTNG_OK) { |
b1d41407 | 2651 | free(uris); |
a4b92340 DG |
2652 | goto error; |
2653 | } | |
2654 | ||
2655 | /* | |
2656 | * XXX: 0 means that this URI should be applied on the session. Should | |
2657 | * be a DOMAIN enuam. | |
2658 | */ | |
2659 | if (cmd_ctx->lsm->domain.type == 0) { | |
2660 | /* Add the URI for the UST session if a consumer is present. */ | |
2661 | if (cmd_ctx->session->ust_session && | |
2662 | cmd_ctx->session->ust_session->consumer) { | |
2663 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2664 | nb_uri, uris); | |
2665 | } else if (cmd_ctx->session->kernel_session && | |
2666 | cmd_ctx->session->kernel_session->consumer) { | |
2667 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2668 | cmd_ctx->session, nb_uri, uris); | |
2669 | } | |
2670 | } | |
2671 | ||
b1d41407 DG |
2672 | free(uris); |
2673 | ||
00e2e675 DG |
2674 | break; |
2675 | } | |
f3ed775e | 2676 | case LTTNG_START_TRACE: |
8c0faa1d | 2677 | { |
54d01ffb | 2678 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2679 | break; |
2680 | } | |
f3ed775e | 2681 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2682 | { |
54d01ffb | 2683 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2684 | break; |
2685 | } | |
5e16da05 MD |
2686 | case LTTNG_CREATE_SESSION: |
2687 | { | |
a4b92340 DG |
2688 | size_t nb_uri, len; |
2689 | struct lttng_uri *uris = NULL; | |
2690 | ||
2691 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2692 | len = nb_uri * sizeof(struct lttng_uri); | |
2693 | ||
2694 | if (nb_uri > 0) { | |
2695 | uris = zmalloc(len); | |
2696 | if (uris == NULL) { | |
f73fabfd | 2697 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2698 | goto error; |
2699 | } | |
2700 | ||
2701 | /* Receive variable len data */ | |
77c7c900 | 2702 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
2703 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2704 | if (ret <= 0) { | |
2705 | DBG("No URIs received from client... continuing"); | |
2706 | *sock_error = 1; | |
f73fabfd | 2707 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2708 | free(uris); |
a4b92340 DG |
2709 | goto error; |
2710 | } | |
2711 | ||
2712 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
2713 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 2714 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2715 | free(uris); |
a4b92340 DG |
2716 | goto error; |
2717 | } | |
2718 | } | |
2719 | ||
2720 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
2721 | &cmd_ctx->creds); | |
2722 | ||
b1d41407 DG |
2723 | free(uris); |
2724 | ||
00e2e675 DG |
2725 | break; |
2726 | } | |
5e16da05 MD |
2727 | case LTTNG_DESTROY_SESSION: |
2728 | { | |
2f77fc4b | 2729 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
2730 | |
2731 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 2732 | cmd_ctx->session = NULL; |
5461b305 | 2733 | break; |
5e16da05 | 2734 | } |
9f19cc17 | 2735 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2736 | { |
54d01ffb DG |
2737 | ssize_t nb_dom; |
2738 | struct lttng_domain *domains; | |
5461b305 | 2739 | |
54d01ffb DG |
2740 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2741 | if (nb_dom < 0) { | |
f73fabfd | 2742 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2743 | ret = -nb_dom; |
2744 | goto error; | |
ce3d728c | 2745 | } |
520ff687 | 2746 | |
54d01ffb | 2747 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2748 | if (ret < 0) { |
2749 | goto setup_error; | |
520ff687 | 2750 | } |
57167058 | 2751 | |
54d01ffb DG |
2752 | /* Copy event list into message payload */ |
2753 | memcpy(cmd_ctx->llm->payload, domains, | |
2754 | nb_dom * sizeof(struct lttng_domain)); | |
2755 | ||
2756 | free(domains); | |
5e16da05 | 2757 | |
f73fabfd | 2758 | ret = LTTNG_OK; |
5e16da05 MD |
2759 | break; |
2760 | } | |
9f19cc17 | 2761 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2762 | { |
6775595e | 2763 | int nb_chan; |
54d01ffb DG |
2764 | struct lttng_channel *channels; |
2765 | ||
b551a063 DG |
2766 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
2767 | cmd_ctx->session, &channels); | |
54d01ffb | 2768 | if (nb_chan < 0) { |
f73fabfd | 2769 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2770 | ret = -nb_chan; |
2771 | goto error; | |
5461b305 | 2772 | } |
ca95a216 | 2773 | |
54d01ffb | 2774 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2775 | if (ret < 0) { |
2776 | goto setup_error; | |
2777 | } | |
9f19cc17 | 2778 | |
54d01ffb DG |
2779 | /* Copy event list into message payload */ |
2780 | memcpy(cmd_ctx->llm->payload, channels, | |
2781 | nb_chan * sizeof(struct lttng_channel)); | |
2782 | ||
2783 | free(channels); | |
9f19cc17 | 2784 | |
f73fabfd | 2785 | ret = LTTNG_OK; |
5461b305 | 2786 | break; |
5e16da05 | 2787 | } |
9f19cc17 | 2788 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2789 | { |
b551a063 | 2790 | ssize_t nb_event; |
684d34d2 | 2791 | struct lttng_event *events = NULL; |
9f19cc17 | 2792 | |
b551a063 | 2793 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
2794 | cmd_ctx->lsm->u.list.channel_name, &events); |
2795 | if (nb_event < 0) { | |
f73fabfd | 2796 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2797 | ret = -nb_event; |
2798 | goto error; | |
5461b305 | 2799 | } |
ca95a216 | 2800 | |
54d01ffb | 2801 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2802 | if (ret < 0) { |
2803 | goto setup_error; | |
2804 | } | |
9f19cc17 | 2805 | |
54d01ffb DG |
2806 | /* Copy event list into message payload */ |
2807 | memcpy(cmd_ctx->llm->payload, events, | |
2808 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2809 | |
54d01ffb | 2810 | free(events); |
9f19cc17 | 2811 | |
f73fabfd | 2812 | ret = LTTNG_OK; |
5461b305 | 2813 | break; |
5e16da05 MD |
2814 | } |
2815 | case LTTNG_LIST_SESSIONS: | |
2816 | { | |
8e0af1b4 | 2817 | unsigned int nr_sessions; |
5461b305 | 2818 | |
8e0af1b4 | 2819 | session_lock_list(); |
730389d9 DG |
2820 | nr_sessions = lttng_sessions_count( |
2821 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2822 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 2823 | |
8e0af1b4 | 2824 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 2825 | if (ret < 0) { |
54d01ffb | 2826 | session_unlock_list(); |
5461b305 | 2827 | goto setup_error; |
e065084a | 2828 | } |
5e16da05 | 2829 | |
6c9cc2ab | 2830 | /* Filled the session array */ |
2f77fc4b | 2831 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
2832 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2833 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 2834 | |
54d01ffb | 2835 | session_unlock_list(); |
5e16da05 | 2836 | |
f73fabfd | 2837 | ret = LTTNG_OK; |
5e16da05 MD |
2838 | break; |
2839 | } | |
d0254c7c MD |
2840 | case LTTNG_CALIBRATE: |
2841 | { | |
54d01ffb DG |
2842 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2843 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2844 | break; |
2845 | } | |
d9800920 DG |
2846 | case LTTNG_REGISTER_CONSUMER: |
2847 | { | |
2f77fc4b DG |
2848 | struct consumer_data *cdata; |
2849 | ||
2850 | switch (cmd_ctx->lsm->domain.type) { | |
2851 | case LTTNG_DOMAIN_KERNEL: | |
2852 | cdata = &kconsumer_data; | |
2853 | break; | |
2854 | default: | |
f73fabfd | 2855 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2856 | goto error; |
2857 | } | |
2858 | ||
54d01ffb | 2859 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2860 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
2861 | break; |
2862 | } | |
025faf73 | 2863 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
2864 | { |
2865 | struct lttng_filter_bytecode *bytecode; | |
2866 | ||
025faf73 | 2867 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 2868 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2869 | goto error; |
2870 | } | |
52df2401 MD |
2871 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
2872 | ret = LTTNG_ERR_FILTER_INVAL; | |
2873 | goto error; | |
2874 | } | |
025faf73 | 2875 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 2876 | if (!bytecode) { |
f73fabfd | 2877 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
2878 | goto error; |
2879 | } | |
2880 | /* Receive var. len. data */ | |
2881 | DBG("Receiving var len data from client ..."); | |
2882 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 2883 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
2884 | if (ret <= 0) { |
2885 | DBG("Nothing recv() from client var len data... continuing"); | |
2886 | *sock_error = 1; | |
f73fabfd | 2887 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2888 | goto error; |
2889 | } | |
2890 | ||
2891 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 2892 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 2893 | free(bytecode); |
f73fabfd | 2894 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2895 | goto error; |
2896 | } | |
2897 | ||
025faf73 DG |
2898 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2899 | cmd_ctx->lsm->u.enable.channel_name, | |
2900 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
2901 | break; |
2902 | } | |
6d805429 | 2903 | case LTTNG_DATA_PENDING: |
806e2684 | 2904 | { |
6d805429 | 2905 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
2906 | break; |
2907 | } | |
5e16da05 | 2908 | default: |
f73fabfd | 2909 | ret = LTTNG_ERR_UND; |
5461b305 | 2910 | break; |
fac6795d DG |
2911 | } |
2912 | ||
5461b305 | 2913 | error: |
5461b305 DG |
2914 | if (cmd_ctx->llm == NULL) { |
2915 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2916 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2917 | goto setup_error; |
2918 | } | |
2919 | } | |
54d01ffb | 2920 | /* Set return code */ |
5461b305 | 2921 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2922 | setup_error: |
b5541356 | 2923 | if (cmd_ctx->session) { |
54d01ffb | 2924 | session_unlock(cmd_ctx->session); |
b5541356 | 2925 | } |
256a5576 MD |
2926 | if (need_tracing_session) { |
2927 | session_unlock_list(); | |
2928 | } | |
54d01ffb | 2929 | init_setup_error: |
8028d920 | 2930 | return ret; |
fac6795d DG |
2931 | } |
2932 | ||
44a5e5eb DG |
2933 | /* |
2934 | * Thread managing health check socket. | |
2935 | */ | |
2936 | static void *thread_manage_health(void *data) | |
2937 | { | |
eb4a2943 | 2938 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
2939 | uint32_t revents, nb_fd; |
2940 | struct lttng_poll_event events; | |
2941 | struct lttcomm_health_msg msg; | |
2942 | struct lttcomm_health_data reply; | |
2943 | ||
2944 | DBG("[thread] Manage health check started"); | |
2945 | ||
2946 | rcu_register_thread(); | |
2947 | ||
2948 | /* Create unix socket */ | |
2949 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
2950 | if (sock < 0) { | |
2951 | ERR("Unable to create health check Unix socket"); | |
2952 | ret = -1; | |
2953 | goto error; | |
2954 | } | |
2955 | ||
b662582b DG |
2956 | /* |
2957 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2958 | * show must go on. | |
2959 | */ | |
2960 | (void) utils_set_fd_cloexec(sock); | |
2961 | ||
44a5e5eb DG |
2962 | ret = lttcomm_listen_unix_sock(sock); |
2963 | if (ret < 0) { | |
2964 | goto error; | |
2965 | } | |
2966 | ||
2967 | /* | |
2968 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2969 | * more will be added to this poll set. | |
2970 | */ | |
2971 | ret = create_thread_poll_set(&events, 2); | |
2972 | if (ret < 0) { | |
2973 | goto error; | |
2974 | } | |
2975 | ||
2976 | /* Add the application registration socket */ | |
2977 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
2978 | if (ret < 0) { | |
2979 | goto error; | |
2980 | } | |
2981 | ||
2982 | while (1) { | |
2983 | DBG("Health check ready"); | |
2984 | ||
2985 | nb_fd = LTTNG_POLL_GETNB(&events); | |
2986 | ||
2987 | /* Inifinite blocking call, waiting for transmission */ | |
2988 | restart: | |
2989 | ret = lttng_poll_wait(&events, -1); | |
2990 | if (ret < 0) { | |
2991 | /* | |
2992 | * Restart interrupted system call. | |
2993 | */ | |
2994 | if (errno == EINTR) { | |
2995 | goto restart; | |
2996 | } | |
2997 | goto error; | |
2998 | } | |
2999 | ||
3000 | for (i = 0; i < nb_fd; i++) { | |
3001 | /* Fetch once the poll data */ | |
3002 | revents = LTTNG_POLL_GETEV(&events, i); | |
3003 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3004 | ||
3005 | /* Thread quit pipe has been closed. Killing thread. */ | |
3006 | ret = check_thread_quit_pipe(pollfd, revents); | |
3007 | if (ret) { | |
139ac872 MD |
3008 | err = 0; |
3009 | goto exit; | |
44a5e5eb DG |
3010 | } |
3011 | ||
3012 | /* Event on the registration socket */ | |
3013 | if (pollfd == sock) { | |
3014 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3015 | ERR("Health socket poll error"); | |
3016 | goto error; | |
3017 | } | |
3018 | } | |
3019 | } | |
3020 | ||
3021 | new_sock = lttcomm_accept_unix_sock(sock); | |
3022 | if (new_sock < 0) { | |
3023 | goto error; | |
3024 | } | |
3025 | ||
b662582b DG |
3026 | /* |
3027 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3028 | * show must go on. | |
3029 | */ | |
3030 | (void) utils_set_fd_cloexec(new_sock); | |
3031 | ||
44a5e5eb DG |
3032 | DBG("Receiving data from client for health..."); |
3033 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3034 | if (ret <= 0) { | |
3035 | DBG("Nothing recv() from client... continuing"); | |
3036 | ret = close(new_sock); | |
3037 | if (ret) { | |
3038 | PERROR("close"); | |
3039 | } | |
3040 | new_sock = -1; | |
3041 | continue; | |
3042 | } | |
3043 | ||
3044 | rcu_thread_online(); | |
3045 | ||
3046 | switch (msg.component) { | |
3047 | case LTTNG_HEALTH_CMD: | |
3048 | reply.ret_code = health_check_state(&health_thread_cmd); | |
3049 | break; | |
139ac872 MD |
3050 | case LTTNG_HEALTH_APP_MANAGE: |
3051 | reply.ret_code = health_check_state(&health_thread_app_manage); | |
3052 | break; | |
44a5e5eb DG |
3053 | case LTTNG_HEALTH_APP_REG: |
3054 | reply.ret_code = health_check_state(&health_thread_app_reg); | |
3055 | break; | |
3056 | case LTTNG_HEALTH_KERNEL: | |
3057 | reply.ret_code = health_check_state(&health_thread_kernel); | |
3058 | break; | |
3059 | case LTTNG_HEALTH_CONSUMER: | |
3060 | reply.ret_code = check_consumer_health(); | |
3061 | break; | |
3062 | case LTTNG_HEALTH_ALL: | |
44a5e5eb | 3063 | reply.ret_code = |
139ac872 MD |
3064 | health_check_state(&health_thread_app_manage) && |
3065 | health_check_state(&health_thread_app_reg) && | |
3066 | health_check_state(&health_thread_cmd) && | |
3067 | health_check_state(&health_thread_kernel) && | |
3068 | check_consumer_health(); | |
44a5e5eb DG |
3069 | break; |
3070 | default: | |
f73fabfd | 3071 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3072 | break; |
3073 | } | |
3074 | ||
3075 | /* | |
3076 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3077 | * the client where in the sessiond it is the opposite. Again, this is | |
3078 | * just to make things easier for us poor developer which enjoy a lot | |
3079 | * lazyness. | |
3080 | */ | |
3081 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3082 | reply.ret_code = !reply.ret_code; | |
3083 | } | |
3084 | ||
3085 | DBG2("Health check return value %d", reply.ret_code); | |
3086 | ||
3087 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3088 | if (ret < 0) { | |
3089 | ERR("Failed to send health data back to client"); | |
3090 | } | |
3091 | ||
3092 | /* End of transmission */ | |
3093 | ret = close(new_sock); | |
3094 | if (ret) { | |
3095 | PERROR("close"); | |
3096 | } | |
3097 | new_sock = -1; | |
3098 | } | |
3099 | ||
139ac872 | 3100 | exit: |
44a5e5eb | 3101 | error: |
139ac872 MD |
3102 | if (err) { |
3103 | ERR("Health error occurred in %s", __func__); | |
3104 | } | |
44a5e5eb DG |
3105 | DBG("Health check thread dying"); |
3106 | unlink(health_unix_sock_path); | |
3107 | if (sock >= 0) { | |
3108 | ret = close(sock); | |
3109 | if (ret) { | |
3110 | PERROR("close"); | |
3111 | } | |
3112 | } | |
3113 | if (new_sock >= 0) { | |
3114 | ret = close(new_sock); | |
3115 | if (ret) { | |
3116 | PERROR("close"); | |
3117 | } | |
3118 | } | |
3119 | ||
3120 | lttng_poll_clean(&events); | |
3121 | ||
3122 | rcu_unregister_thread(); | |
3123 | return NULL; | |
3124 | } | |
3125 | ||
1d4b027a | 3126 | /* |
d063d709 DG |
3127 | * This thread manage all clients request using the unix client socket for |
3128 | * communication. | |
1d4b027a DG |
3129 | */ |
3130 | static void *thread_manage_clients(void *data) | |
3131 | { | |
139ac872 | 3132 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3133 | int sock_error; |
5eb91c98 | 3134 | uint32_t revents, nb_fd; |
273ea72c | 3135 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3136 | struct lttng_poll_event events; |
1d4b027a DG |
3137 | |
3138 | DBG("[thread] Manage client started"); | |
3139 | ||
f6a9efaa DG |
3140 | rcu_register_thread(); |
3141 | ||
6993eeb3 CB |
3142 | if (testpoint(thread_manage_clients)) { |
3143 | goto error_testpoint; | |
3144 | } | |
3145 | ||
44a5e5eb DG |
3146 | health_code_update(&health_thread_cmd); |
3147 | ||
1d4b027a DG |
3148 | ret = lttcomm_listen_unix_sock(client_sock); |
3149 | if (ret < 0) { | |
35df2755 | 3150 | goto error_listen; |
1d4b027a DG |
3151 | } |
3152 | ||
5eb91c98 DG |
3153 | /* |
3154 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3155 | * more will be added to this poll set. | |
3156 | */ | |
3157 | ret = create_thread_poll_set(&events, 2); | |
3158 | if (ret < 0) { | |
35df2755 | 3159 | goto error_create_poll; |
5eb91c98 | 3160 | } |
273ea72c | 3161 | |
5eb91c98 DG |
3162 | /* Add the application registration socket */ |
3163 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3164 | if (ret < 0) { | |
3165 | goto error; | |
3166 | } | |
273ea72c | 3167 | |
bbd973c2 DG |
3168 | /* |
3169 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3170 | */ |
3171 | if (opt_sig_parent) { | |
8db8d1dc | 3172 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3173 | } |
3174 | ||
6993eeb3 CB |
3175 | if (testpoint(thread_manage_clients_before_loop)) { |
3176 | goto error; | |
3177 | } | |
8ac94142 | 3178 | |
44a5e5eb DG |
3179 | health_code_update(&health_thread_cmd); |
3180 | ||
1d4b027a | 3181 | while (1) { |
1d4b027a | 3182 | DBG("Accepting client command ..."); |
273ea72c | 3183 | |
5eb91c98 DG |
3184 | nb_fd = LTTNG_POLL_GETNB(&events); |
3185 | ||
273ea72c | 3186 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3187 | restart: |
44a5e5eb | 3188 | health_poll_update(&health_thread_cmd); |
5eb91c98 | 3189 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 3190 | health_poll_update(&health_thread_cmd); |
273ea72c | 3191 | if (ret < 0) { |
88f2b785 MD |
3192 | /* |
3193 | * Restart interrupted system call. | |
3194 | */ | |
3195 | if (errno == EINTR) { | |
3196 | goto restart; | |
3197 | } | |
273ea72c DG |
3198 | goto error; |
3199 | } | |
3200 | ||
5eb91c98 DG |
3201 | for (i = 0; i < nb_fd; i++) { |
3202 | /* Fetch once the poll data */ | |
3203 | revents = LTTNG_POLL_GETEV(&events, i); | |
3204 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3205 | ||
44a5e5eb DG |
3206 | health_code_update(&health_thread_cmd); |
3207 | ||
5eb91c98 DG |
3208 | /* Thread quit pipe has been closed. Killing thread. */ |
3209 | ret = check_thread_quit_pipe(pollfd, revents); | |
3210 | if (ret) { | |
139ac872 MD |
3211 | err = 0; |
3212 | goto exit; | |
5eb91c98 DG |
3213 | } |
3214 | ||
3215 | /* Event on the registration socket */ | |
3216 | if (pollfd == client_sock) { | |
3217 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3218 | ERR("Client socket poll error"); | |
3219 | goto error; | |
3220 | } | |
3221 | } | |
3222 | } | |
3223 | ||
3224 | DBG("Wait for client response"); | |
3225 | ||
44a5e5eb DG |
3226 | health_code_update(&health_thread_cmd); |
3227 | ||
5eb91c98 DG |
3228 | sock = lttcomm_accept_unix_sock(client_sock); |
3229 | if (sock < 0) { | |
273ea72c | 3230 | goto error; |
273ea72c DG |
3231 | } |
3232 | ||
b662582b DG |
3233 | /* |
3234 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3235 | * show must go on. | |
3236 | */ | |
3237 | (void) utils_set_fd_cloexec(sock); | |
3238 | ||
be040666 DG |
3239 | /* Set socket option for credentials retrieval */ |
3240 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3241 | if (ret < 0) { | |
3242 | goto error; | |
3243 | } | |
3244 | ||
5eb91c98 | 3245 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3246 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3247 | if (cmd_ctx == NULL) { |
76d7553f | 3248 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3249 | goto error; |
5eb91c98 | 3250 | } |
1d4b027a | 3251 | |
5eb91c98 | 3252 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3253 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3254 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3255 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3256 | goto error; |
3257 | } | |
1d4b027a | 3258 | |
5eb91c98 DG |
3259 | cmd_ctx->llm = NULL; |
3260 | cmd_ctx->session = NULL; | |
1d4b027a | 3261 | |
44a5e5eb DG |
3262 | health_code_update(&health_thread_cmd); |
3263 | ||
5eb91c98 DG |
3264 | /* |
3265 | * Data is received from the lttng client. The struct | |
3266 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3267 | * the client. | |
3268 | */ | |
3269 | DBG("Receiving data from client ..."); | |
be040666 DG |
3270 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3271 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3272 | if (ret <= 0) { |
3273 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3274 | ret = close(sock); |
3275 | if (ret) { | |
3276 | PERROR("close"); | |
3277 | } | |
3278 | sock = -1; | |
a2c0da86 | 3279 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3280 | continue; |
3281 | } | |
1d4b027a | 3282 | |
44a5e5eb DG |
3283 | health_code_update(&health_thread_cmd); |
3284 | ||
5eb91c98 DG |
3285 | // TODO: Validate cmd_ctx including sanity check for |
3286 | // security purpose. | |
f7776ea7 | 3287 | |
f6a9efaa | 3288 | rcu_thread_online(); |
5eb91c98 DG |
3289 | /* |
3290 | * This function dispatch the work to the kernel or userspace tracer | |
3291 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3292 | * informations for the client. The command context struct contains | |
3293 | * everything this function may needs. | |
3294 | */ | |
53a80697 | 3295 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3296 | rcu_thread_offline(); |
5eb91c98 | 3297 | if (ret < 0) { |
53a80697 MD |
3298 | if (sock_error) { |
3299 | ret = close(sock); | |
3300 | if (ret) { | |
3301 | PERROR("close"); | |
3302 | } | |
3303 | sock = -1; | |
3304 | } | |
bbd973c2 | 3305 | /* |
5eb91c98 | 3306 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3307 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3308 | * (ENOMEM). Error detected but still accept |
3309 | * command, unless a socket error has been | |
3310 | * detected. | |
bbd973c2 | 3311 | */ |
bbd973c2 | 3312 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3313 | continue; |
3314 | } | |
d6e4fca4 | 3315 | |
44a5e5eb DG |
3316 | health_code_update(&health_thread_cmd); |
3317 | ||
54d01ffb DG |
3318 | DBG("Sending response (size: %d, retcode: %s)", |
3319 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3320 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3321 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3322 | if (ret < 0) { |
3323 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3324 | } |
1d4b027a | 3325 | |
5eb91c98 | 3326 | /* End of transmission */ |
76d7553f MD |
3327 | ret = close(sock); |
3328 | if (ret) { | |
3329 | PERROR("close"); | |
3330 | } | |
3331 | sock = -1; | |
be040666 DG |
3332 | |
3333 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb DG |
3334 | |
3335 | health_code_update(&health_thread_cmd); | |
273ea72c DG |
3336 | } |
3337 | ||
139ac872 | 3338 | exit: |
5eb91c98 | 3339 | error: |
35df2755 CB |
3340 | if (sock >= 0) { |
3341 | ret = close(sock); | |
3342 | if (ret) { | |
3343 | PERROR("close"); | |
3344 | } | |
139ac872 | 3345 | } |
44a5e5eb | 3346 | |
35df2755 CB |
3347 | lttng_poll_clean(&events); |
3348 | clean_command_ctx(&cmd_ctx); | |
3349 | ||
3350 | error_listen: | |
3351 | error_create_poll: | |
6993eeb3 | 3352 | error_testpoint: |
273ea72c | 3353 | unlink(client_unix_sock_path); |
76d7553f MD |
3354 | if (client_sock >= 0) { |
3355 | ret = close(client_sock); | |
3356 | if (ret) { | |
3357 | PERROR("close"); | |
3358 | } | |
a4b35e07 | 3359 | } |
35df2755 CB |
3360 | |
3361 | if (err) { | |
3362 | health_error(&health_thread_cmd); | |
3363 | ERR("Health error occurred in %s", __func__); | |
a4b35e07 | 3364 | } |
273ea72c | 3365 | |
35df2755 CB |
3366 | health_exit(&health_thread_cmd); |
3367 | ||
3368 | DBG("Client thread dying"); | |
f6a9efaa DG |
3369 | |
3370 | rcu_unregister_thread(); | |
1d4b027a DG |
3371 | return NULL; |
3372 | } | |
3373 | ||
3374 | ||
fac6795d DG |
3375 | /* |
3376 | * usage function on stderr | |
3377 | */ | |
3378 | static void usage(void) | |
3379 | { | |
b716ce68 | 3380 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3381 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3382 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3383 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3384 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3385 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3386 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3387 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3388 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3389 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3390 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3391 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3392 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3393 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3394 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3395 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3396 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3397 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3398 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3399 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3400 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3401 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3402 | } |
3403 | ||
3404 | /* | |
3405 | * daemon argument parsing | |
3406 | */ | |
3407 | static int parse_args(int argc, char **argv) | |
3408 | { | |
3409 | int c; | |
3410 | ||
3411 | static struct option long_options[] = { | |
3412 | { "client-sock", 1, 0, 'c' }, | |
3413 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3414 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3415 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3416 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3417 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3418 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3419 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3420 | { "consumerd32-path", 1, 0, 'u' }, | |
3421 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3422 | { "consumerd64-path", 1, 0, 't' }, | |
3423 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3424 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3425 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3426 | { "help", 0, 0, 'h' }, |
3427 | { "group", 1, 0, 'g' }, | |
3428 | { "version", 0, 0, 'V' }, | |
75462a81 | 3429 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3430 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3431 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3432 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3433 | { NULL, 0, 0, 0 } |
3434 | }; | |
3435 | ||
3436 | while (1) { | |
3437 | int option_index = 0; | |
4fba7219 | 3438 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3439 | long_options, &option_index); |
fac6795d DG |
3440 | if (c == -1) { |
3441 | break; | |
3442 | } | |
3443 | ||
3444 | switch (c) { | |
3445 | case 0: | |
3446 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3447 | if (optarg) { | |
3448 | fprintf(stderr, " with arg %s\n", optarg); | |
3449 | } | |
3450 | break; | |
b716ce68 | 3451 | case 'c': |
fac6795d DG |
3452 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3453 | break; | |
3454 | case 'a': | |
3455 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3456 | break; | |
3457 | case 'd': | |
3458 | opt_daemon = 1; | |
3459 | break; | |
3460 | case 'g': | |
fb09408a | 3461 | opt_tracing_group = optarg; |
fac6795d DG |
3462 | break; |
3463 | case 'h': | |
3464 | usage(); | |
3465 | exit(EXIT_FAILURE); | |
3466 | case 'V': | |
3467 | fprintf(stdout, "%s\n", VERSION); | |
3468 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3469 | case 'S': |
3470 | opt_sig_parent = 1; | |
3471 | break; | |
d6f42150 | 3472 | case 'E': |
3bd1e081 | 3473 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3474 | break; |
3475 | case 'C': | |
3bd1e081 MD |
3476 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3477 | break; | |
3478 | case 'F': | |
7753dea8 | 3479 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3480 | break; |
3481 | case 'D': | |
7753dea8 MD |
3482 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3483 | break; | |
3484 | case 'H': | |
3485 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3486 | break; | |
3487 | case 'G': | |
3488 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3489 | break; |
4fba7219 DG |
3490 | case 'N': |
3491 | opt_no_kernel = 1; | |
3492 | break; | |
75462a81 | 3493 | case 'q': |
97e19046 | 3494 | lttng_opt_quiet = 1; |
75462a81 | 3495 | break; |
3f9947db | 3496 | case 'v': |
53086306 | 3497 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3498 | lttng_opt_verbose += 1; |
3f9947db | 3499 | break; |
31f73cc9 | 3500 | case 'Z': |
3bd1e081 | 3501 | opt_verbose_consumer += 1; |
31f73cc9 | 3502 | break; |
fb09408a | 3503 | case 'u': |
fc7a59ce | 3504 | consumerd32_bin= optarg; |
ebaeda94 MD |
3505 | break; |
3506 | case 'U': | |
3507 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3508 | break; |
3509 | case 't': | |
fc7a59ce | 3510 | consumerd64_bin = optarg; |
ebaeda94 MD |
3511 | break; |
3512 | case 'T': | |
3513 | consumerd64_libdir = optarg; | |
fb09408a | 3514 | break; |
fac6795d DG |
3515 | default: |
3516 | /* Unknown option or other error. | |
3517 | * Error is printed by getopt, just return */ | |
3518 | return -1; | |
3519 | } | |
3520 | } | |
3521 | ||
3522 | return 0; | |
3523 | } | |
3524 | ||
3525 | /* | |
d063d709 | 3526 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3527 | * apps_sock - The communication socket for all UST apps. |
3528 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3529 | */ |
cf3af59e | 3530 | static int init_daemon_socket(void) |
fac6795d DG |
3531 | { |
3532 | int ret = 0; | |
3533 | mode_t old_umask; | |
3534 | ||
3535 | old_umask = umask(0); | |
3536 | ||
3537 | /* Create client tool unix socket */ | |
d6f42150 DG |
3538 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3539 | if (client_sock < 0) { | |
3540 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3541 | ret = -1; |
3542 | goto end; | |
3543 | } | |
3544 | ||
b662582b DG |
3545 | /* Set the cloexec flag */ |
3546 | ret = utils_set_fd_cloexec(client_sock); | |
3547 | if (ret < 0) { | |
3548 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3549 | "Continuing but note that the consumer daemon will have a " | |
3550 | "reference to this socket on exec()", client_sock); | |
3551 | } | |
3552 | ||
fac6795d DG |
3553 | /* File permission MUST be 660 */ |
3554 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3555 | if (ret < 0) { | |
d6f42150 | 3556 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 3557 | PERROR("chmod"); |
fac6795d DG |
3558 | goto end; |
3559 | } | |
3560 | ||
3561 | /* Create the application unix socket */ | |
d6f42150 DG |
3562 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3563 | if (apps_sock < 0) { | |
3564 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3565 | ret = -1; |
3566 | goto end; | |
3567 | } | |
3568 | ||
b662582b DG |
3569 | /* Set the cloexec flag */ |
3570 | ret = utils_set_fd_cloexec(apps_sock); | |
3571 | if (ret < 0) { | |
3572 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
3573 | "Continuing but note that the consumer daemon will have a " | |
3574 | "reference to this socket on exec()", apps_sock); | |
3575 | } | |
3576 | ||
d6f42150 | 3577 | /* File permission MUST be 666 */ |
54d01ffb DG |
3578 | ret = chmod(apps_unix_sock_path, |
3579 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3580 | if (ret < 0) { |
d6f42150 | 3581 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 3582 | PERROR("chmod"); |
fac6795d DG |
3583 | goto end; |
3584 | } | |
3585 | ||
b662582b DG |
3586 | DBG3("Session daemon client socket %d and application socket %d created", |
3587 | client_sock, apps_sock); | |
3588 | ||
fac6795d DG |
3589 | end: |
3590 | umask(old_umask); | |
3591 | return ret; | |
3592 | } | |
3593 | ||
3594 | /* | |
54d01ffb DG |
3595 | * Check if the global socket is available, and if a daemon is answering at the |
3596 | * other side. If yes, error is returned. | |
fac6795d | 3597 | */ |
cf3af59e | 3598 | static int check_existing_daemon(void) |
fac6795d | 3599 | { |
7d8234d9 | 3600 | /* Is there anybody out there ? */ |
099e26bd | 3601 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3602 | return -EEXIST; |
099e26bd | 3603 | } |
b09c7c76 DG |
3604 | |
3605 | return 0; | |
fac6795d DG |
3606 | } |
3607 | ||
fac6795d | 3608 | /* |
d063d709 | 3609 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3610 | * |
d063d709 | 3611 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3612 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3613 | */ |
be040666 | 3614 | static int set_permissions(char *rundir) |
fac6795d DG |
3615 | { |
3616 | int ret; | |
996b65c8 | 3617 | gid_t gid; |
fac6795d | 3618 | |
6775595e DG |
3619 | ret = allowed_group(); |
3620 | if (ret < 0) { | |
be040666 DG |
3621 | WARN("No tracing group detected"); |
3622 | ret = 0; | |
fac6795d DG |
3623 | goto end; |
3624 | } | |
3625 | ||
6775595e DG |
3626 | gid = ret; |
3627 | ||
d6f42150 | 3628 | /* Set lttng run dir */ |
be040666 | 3629 | ret = chown(rundir, 0, gid); |
d6f42150 | 3630 | if (ret < 0) { |
be040666 | 3631 | ERR("Unable to set group on %s", rundir); |
76d7553f | 3632 | PERROR("chown"); |
d6f42150 DG |
3633 | } |
3634 | ||
d1613cf5 | 3635 | /* Ensure tracing group can search the run dir */ |
61076f74 | 3636 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
3637 | if (ret < 0) { |
3638 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 3639 | PERROR("chmod"); |
d1613cf5 JN |
3640 | } |
3641 | ||
d6f42150 | 3642 | /* lttng client socket path */ |
996b65c8 | 3643 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3644 | if (ret < 0) { |
d6f42150 | 3645 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 3646 | PERROR("chown"); |
d6f42150 DG |
3647 | } |
3648 | ||
3bd1e081 MD |
3649 | /* kconsumer error socket path */ |
3650 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3651 | if (ret < 0) { |
3bd1e081 | 3652 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 3653 | PERROR("chown"); |
3bd1e081 MD |
3654 | } |
3655 | ||
7753dea8 MD |
3656 | /* 64-bit ustconsumer error socket path */ |
3657 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3658 | if (ret < 0) { | |
3659 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 3660 | PERROR("chown"); |
7753dea8 MD |
3661 | } |
3662 | ||
3663 | /* 32-bit ustconsumer compat32 error socket path */ | |
3664 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3665 | if (ret < 0) { |
7753dea8 | 3666 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 3667 | PERROR("chown"); |
fac6795d DG |
3668 | } |
3669 | ||
d6f42150 | 3670 | DBG("All permissions are set"); |
e07ae692 | 3671 | |
fac6795d DG |
3672 | end: |
3673 | return ret; | |
3674 | } | |
3675 | ||
d6f42150 | 3676 | /* |
d063d709 | 3677 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 3678 | */ |
67e40797 | 3679 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
3680 | { |
3681 | int ret; | |
3682 | ||
67e40797 DG |
3683 | DBG3("Creating LTTng run directory: %s", rundir); |
3684 | ||
d1613cf5 | 3685 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 3686 | if (ret < 0) { |
b1f11e69 | 3687 | if (errno != EEXIST) { |
67e40797 | 3688 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
3689 | goto error; |
3690 | } else { | |
3691 | ret = 0; | |
3692 | } | |
d6f42150 DG |
3693 | } |
3694 | ||
3695 | error: | |
3696 | return ret; | |
3697 | } | |
3698 | ||
3699 | /* | |
d063d709 DG |
3700 | * Setup sockets and directory needed by the kconsumerd communication with the |
3701 | * session daemon. | |
d6f42150 | 3702 | */ |
67e40797 DG |
3703 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
3704 | const char *rundir) | |
d6f42150 DG |
3705 | { |
3706 | int ret; | |
67e40797 | 3707 | char path[PATH_MAX]; |
d6f42150 | 3708 | |
67e40797 | 3709 | switch (consumer_data->type) { |
7753dea8 | 3710 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 3711 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
3712 | break; |
3713 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 3714 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
3715 | break; |
3716 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 3717 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
3718 | break; |
3719 | default: | |
3720 | ERR("Consumer type unknown"); | |
3721 | ret = -EINVAL; | |
3722 | goto error; | |
d6f42150 DG |
3723 | } |
3724 | ||
67e40797 DG |
3725 | DBG2("Creating consumer directory: %s", path); |
3726 | ||
d1613cf5 | 3727 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 3728 | if (ret < 0) { |
6beb2242 | 3729 | if (errno != EEXIST) { |
f11e84c2 | 3730 | PERROR("mkdir"); |
3bd1e081 | 3731 | ERR("Failed to create %s", path); |
6beb2242 DG |
3732 | goto error; |
3733 | } | |
f11e84c2 | 3734 | ret = -1; |
d6f42150 DG |
3735 | } |
3736 | ||
3737 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3738 | consumer_data->err_sock = |
3739 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3740 | if (consumer_data->err_sock < 0) { | |
3741 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3742 | ret = -1; |
3743 | goto error; | |
3744 | } | |
3745 | ||
3746 | /* File permission MUST be 660 */ | |
3bd1e081 | 3747 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3748 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3749 | if (ret < 0) { |
3bd1e081 | 3750 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 3751 | PERROR("chmod"); |
d6f42150 DG |
3752 | goto error; |
3753 | } | |
3754 | ||
3755 | error: | |
3756 | return ret; | |
3757 | } | |
3758 | ||
fac6795d | 3759 | /* |
d063d709 | 3760 | * Signal handler for the daemon |
cf3af59e | 3761 | * |
54d01ffb DG |
3762 | * Simply stop all worker threads, leaving main() return gracefully after |
3763 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3764 | */ |
3765 | static void sighandler(int sig) | |
3766 | { | |
3767 | switch (sig) { | |
cf3af59e | 3768 | case SIGPIPE: |
af87c45a | 3769 | DBG("SIGPIPE caught"); |
cf3af59e MD |
3770 | return; |
3771 | case SIGINT: | |
af87c45a | 3772 | DBG("SIGINT caught"); |
cf3af59e MD |
3773 | stop_threads(); |
3774 | break; | |
3775 | case SIGTERM: | |
af87c45a | 3776 | DBG("SIGTERM caught"); |
cf3af59e MD |
3777 | stop_threads(); |
3778 | break; | |
3779 | default: | |
3780 | break; | |
fac6795d | 3781 | } |
fac6795d DG |
3782 | } |
3783 | ||
3784 | /* | |
d063d709 | 3785 | * Setup signal handler for : |
1d4b027a | 3786 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3787 | */ |
1d4b027a | 3788 | static int set_signal_handler(void) |
fac6795d | 3789 | { |
1d4b027a DG |
3790 | int ret = 0; |
3791 | struct sigaction sa; | |
3792 | sigset_t sigset; | |
fac6795d | 3793 | |
1d4b027a | 3794 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 3795 | PERROR("sigemptyset"); |
1d4b027a DG |
3796 | return ret; |
3797 | } | |
d6f42150 | 3798 | |
1d4b027a DG |
3799 | sa.sa_handler = sighandler; |
3800 | sa.sa_mask = sigset; | |
3801 | sa.sa_flags = 0; | |
3802 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 3803 | PERROR("sigaction"); |
1d4b027a | 3804 | return ret; |
d6f42150 DG |
3805 | } |
3806 | ||
1d4b027a | 3807 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 3808 | PERROR("sigaction"); |
1d4b027a | 3809 | return ret; |
d6f42150 | 3810 | } |
aaf26714 | 3811 | |
1d4b027a | 3812 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 3813 | PERROR("sigaction"); |
1d4b027a | 3814 | return ret; |
8c0faa1d DG |
3815 | } |
3816 | ||
1d4b027a DG |
3817 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3818 | ||
3819 | return ret; | |
fac6795d DG |
3820 | } |
3821 | ||
f3ed775e | 3822 | /* |
d063d709 DG |
3823 | * Set open files limit to unlimited. This daemon can open a large number of |
3824 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3825 | */ |
3826 | static void set_ulimit(void) | |
3827 | { | |
3828 | int ret; | |
3829 | struct rlimit lim; | |
3830 | ||
a88df331 | 3831 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3832 | lim.rlim_cur = 65535; |
3833 | lim.rlim_max = 65535; | |
3834 | ||
3835 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3836 | if (ret < 0) { | |
76d7553f | 3837 | PERROR("failed to set open files limit"); |
f3ed775e DG |
3838 | } |
3839 | } | |
3840 | ||
fac6795d DG |
3841 | /* |
3842 | * main | |
3843 | */ | |
3844 | int main(int argc, char **argv) | |
3845 | { | |
fac6795d DG |
3846 | int ret = 0; |
3847 | void *status; | |
ae9e45b3 | 3848 | const char *home_path, *env_app_timeout; |
fac6795d | 3849 | |
335a95b7 MD |
3850 | init_kernel_workarounds(); |
3851 | ||
f6a9efaa DG |
3852 | rcu_register_thread(); |
3853 | ||
7753dea8 | 3854 | setup_consumerd_path(); |
fb09408a | 3855 | |
fac6795d DG |
3856 | /* Parse arguments */ |
3857 | progname = argv[0]; | |
3858 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3859 | goto error; |
fac6795d DG |
3860 | } |
3861 | ||
3862 | /* Daemonize */ | |
3863 | if (opt_daemon) { | |
ceed52b5 MD |
3864 | int i; |
3865 | ||
3866 | /* | |
3867 | * fork | |
3868 | * child: setsid, close FD 0, 1, 2, chdir / | |
3869 | * parent: exit (if fork is successful) | |
3870 | */ | |
53094c05 DG |
3871 | ret = daemon(0, 0); |
3872 | if (ret < 0) { | |
76d7553f | 3873 | PERROR("daemon"); |
cf3af59e | 3874 | goto error; |
53094c05 | 3875 | } |
ceed52b5 MD |
3876 | /* |
3877 | * We are in the child. Make sure all other file | |
3878 | * descriptors are closed, in case we are called with | |
3879 | * more opened file descriptors than the standard ones. | |
3880 | */ | |
3881 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
3882 | (void) close(i); | |
3883 | } | |
3884 | } | |
3885 | ||
3886 | /* Create thread quit pipe */ | |
3887 | if ((ret = init_thread_quit_pipe()) < 0) { | |
3888 | goto error; | |
fac6795d DG |
3889 | } |
3890 | ||
3891 | /* Check if daemon is UID = 0 */ | |
3892 | is_root = !getuid(); | |
3893 | ||
fac6795d | 3894 | if (is_root) { |
990570ed | 3895 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
3896 | |
3897 | /* Create global run dir with root access */ | |
3898 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 3899 | if (ret < 0) { |
cf3af59e | 3900 | goto error; |
d6f42150 DG |
3901 | } |
3902 | ||
fac6795d | 3903 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3904 | snprintf(apps_unix_sock_path, PATH_MAX, |
3905 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3906 | } |
3907 | ||
3908 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3909 | snprintf(client_unix_sock_path, PATH_MAX, |
3910 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3911 | } | |
0fdd1e2c DG |
3912 | |
3913 | /* Set global SHM for ust */ | |
3914 | if (strlen(wait_shm_path) == 0) { | |
3915 | snprintf(wait_shm_path, PATH_MAX, | |
3916 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3917 | } | |
67e40797 | 3918 | |
44a5e5eb DG |
3919 | if (strlen(health_unix_sock_path) == 0) { |
3920 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3921 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
3922 | } | |
3923 | ||
67e40797 DG |
3924 | /* Setup kernel consumerd path */ |
3925 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3926 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 3927 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3928 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3929 | |
3930 | DBG2("Kernel consumer err path: %s", | |
3931 | kconsumer_data.err_unix_sock_path); | |
3932 | DBG2("Kernel consumer cmd path: %s", | |
3933 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 3934 | } else { |
b082db07 DG |
3935 | home_path = get_home_dir(); |
3936 | if (home_path == NULL) { | |
273ea72c DG |
3937 | /* TODO: Add --socket PATH option */ |
3938 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3939 | ret = -EPERM; |
3940 | goto error; | |
b082db07 DG |
3941 | } |
3942 | ||
67e40797 DG |
3943 | /* |
3944 | * Create rundir from home path. This will create something like | |
3945 | * $HOME/.lttng | |
3946 | */ | |
990570ed | 3947 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
3948 | if (ret < 0) { |
3949 | ret = -ENOMEM; | |
3950 | goto error; | |
3951 | } | |
3952 | ||
3953 | ret = create_lttng_rundir(rundir); | |
3954 | if (ret < 0) { | |
3955 | goto error; | |
3956 | } | |
3957 | ||
fac6795d | 3958 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3959 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3960 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3961 | } |
3962 | ||
3963 | /* Set the cli tool unix socket path */ | |
3964 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3965 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3966 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3967 | } |
0fdd1e2c DG |
3968 | |
3969 | /* Set global SHM for ust */ | |
3970 | if (strlen(wait_shm_path) == 0) { | |
3971 | snprintf(wait_shm_path, PATH_MAX, | |
3972 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3973 | } | |
44a5e5eb DG |
3974 | |
3975 | /* Set health check Unix path */ | |
3976 | if (strlen(health_unix_sock_path) == 0) { | |
3977 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3978 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
3979 | } | |
fac6795d DG |
3980 | } |
3981 | ||
5c827ce0 DG |
3982 | /* Set consumer initial state */ |
3983 | kernel_consumerd_state = CONSUMER_STOPPED; | |
3984 | ust_consumerd_state = CONSUMER_STOPPED; | |
3985 | ||
847177cd DG |
3986 | DBG("Client socket path %s", client_unix_sock_path); |
3987 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
3988 | DBG("LTTng run directory path: %s", rundir); |
3989 | ||
3990 | /* 32 bits consumerd path setup */ | |
3991 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3992 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 3993 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3994 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3995 | |
3996 | DBG2("UST consumer 32 bits err path: %s", | |
3997 | ustconsumer32_data.err_unix_sock_path); | |
3998 | DBG2("UST consumer 32 bits cmd path: %s", | |
3999 | ustconsumer32_data.cmd_unix_sock_path); | |
4000 | ||
4001 | /* 64 bits consumerd path setup */ | |
4002 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4003 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4004 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4005 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4006 | |
4007 | DBG2("UST consumer 64 bits err path: %s", | |
4008 | ustconsumer64_data.err_unix_sock_path); | |
4009 | DBG2("UST consumer 64 bits cmd path: %s", | |
4010 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4011 | |
273ea72c | 4012 | /* |
7d8234d9 | 4013 | * See if daemon already exist. |
fac6795d | 4014 | */ |
7d8234d9 | 4015 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4016 | ERR("Already running daemon.\n"); |
273ea72c | 4017 | /* |
cf3af59e MD |
4018 | * We do not goto exit because we must not cleanup() |
4019 | * because a daemon is already running. | |
ab118b20 | 4020 | */ |
cf3af59e | 4021 | goto error; |
a88df331 DG |
4022 | } |
4023 | ||
1427f9b2 DG |
4024 | /* |
4025 | * Init UST app hash table. Alloc hash table before this point since | |
4026 | * cleanup() can get called after that point. | |
4027 | */ | |
4028 | ust_app_ht_alloc(); | |
4029 | ||
54d01ffb | 4030 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4031 | |
4032 | /* | |
4033 | * These actions must be executed as root. We do that *after* setting up | |
4034 | * the sockets path because we MUST make the check for another daemon using | |
4035 | * those paths *before* trying to set the kernel consumer sockets and init | |
4036 | * kernel tracer. | |
4037 | */ | |
4038 | if (is_root) { | |
67e40797 | 4039 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4040 | if (ret < 0) { |
4041 | goto exit; | |
4042 | } | |
4043 | ||
a88df331 | 4044 | /* Setup kernel tracer */ |
4fba7219 DG |
4045 | if (!opt_no_kernel) { |
4046 | init_kernel_tracer(); | |
4047 | } | |
a88df331 DG |
4048 | |
4049 | /* Set ulimit for open files */ | |
4050 | set_ulimit(); | |
fac6795d | 4051 | } |
4063050c MD |
4052 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4053 | lttng_fd_init(); | |
fac6795d | 4054 | |
67e40797 DG |
4055 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4056 | if (ret < 0) { | |
4057 | goto exit; | |
4058 | } | |
4059 | ||
4060 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4061 | if (ret < 0) { | |
4062 | goto exit; | |
4063 | } | |
4064 | ||
cf3af59e MD |
4065 | if ((ret = set_signal_handler()) < 0) { |
4066 | goto exit; | |
fac6795d DG |
4067 | } |
4068 | ||
d6f42150 | 4069 | /* Setup the needed unix socket */ |
cf3af59e MD |
4070 | if ((ret = init_daemon_socket()) < 0) { |
4071 | goto exit; | |
fac6795d DG |
4072 | } |
4073 | ||
4074 | /* Set credentials to socket */ | |
be040666 | 4075 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4076 | goto exit; |
fac6795d DG |
4077 | } |
4078 | ||
5b8719f5 DG |
4079 | /* Get parent pid if -S, --sig-parent is specified. */ |
4080 | if (opt_sig_parent) { | |
4081 | ppid = getppid(); | |
4082 | } | |
4083 | ||
7a485870 | 4084 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4085 | if (is_root && !opt_no_kernel) { |
4086 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4087 | goto exit; | |
4088 | } | |
7a485870 DG |
4089 | } |
4090 | ||
099e26bd | 4091 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4092 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4093 | goto exit; |
4094 | } | |
4095 | ||
4096 | /* Init UST command queue. */ | |
4097 | cds_wfq_init(&ust_cmd_queue.queue); | |
4098 | ||
273ea72c | 4099 | /* |
54d01ffb DG |
4100 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4101 | * statically declared in session.c | |
273ea72c | 4102 | */ |
54d01ffb | 4103 | session_list_ptr = session_get_list(); |
b5541356 | 4104 | |
5eb91c98 DG |
4105 | /* Set up max poll set size */ |
4106 | lttng_poll_set_max_size(); | |
4107 | ||
2f77fc4b | 4108 | cmd_init(); |
00e2e675 | 4109 | |
44a5e5eb DG |
4110 | /* Init all health thread counters. */ |
4111 | health_init(&health_thread_cmd); | |
4112 | health_init(&health_thread_kernel); | |
139ac872 | 4113 | health_init(&health_thread_app_manage); |
44a5e5eb DG |
4114 | health_init(&health_thread_app_reg); |
4115 | ||
4116 | /* | |
4117 | * Init health counters of the consumer thread. We do a quick hack here to | |
4118 | * the state of the consumer health is fine even if the thread is not | |
9449cc75 DG |
4119 | * started. Once the thread starts, the health state is updated with a poll |
4120 | * value to set a health code path. This is simply to ease our life and has | |
4121 | * no cost what so ever. | |
44a5e5eb DG |
4122 | */ |
4123 | health_init(&kconsumer_data.health); | |
4124 | health_poll_update(&kconsumer_data.health); | |
4125 | health_init(&ustconsumer32_data.health); | |
4126 | health_poll_update(&ustconsumer32_data.health); | |
4127 | health_init(&ustconsumer64_data.health); | |
4128 | health_poll_update(&ustconsumer64_data.health); | |
4129 | ||
ae9e45b3 DG |
4130 | /* Check for the application socket timeout env variable. */ |
4131 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4132 | if (env_app_timeout) { | |
4133 | app_socket_timeout = atoi(env_app_timeout); | |
4134 | } else { | |
4135 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4136 | } | |
4137 | ||
44a5e5eb DG |
4138 | /* Create thread to manage the client socket */ |
4139 | ret = pthread_create(&health_thread, NULL, | |
4140 | thread_manage_health, (void *) NULL); | |
4141 | if (ret != 0) { | |
4142 | PERROR("pthread_create health"); | |
4143 | goto exit_health; | |
4144 | } | |
4145 | ||
cf3af59e | 4146 | /* Create thread to manage the client socket */ |
099e26bd DG |
4147 | ret = pthread_create(&client_thread, NULL, |
4148 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4149 | if (ret != 0) { |
76d7553f | 4150 | PERROR("pthread_create clients"); |
cf3af59e MD |
4151 | goto exit_client; |
4152 | } | |
fac6795d | 4153 | |
099e26bd DG |
4154 | /* Create thread to dispatch registration */ |
4155 | ret = pthread_create(&dispatch_thread, NULL, | |
4156 | thread_dispatch_ust_registration, (void *) NULL); | |
4157 | if (ret != 0) { | |
76d7553f | 4158 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4159 | goto exit_dispatch; |
4160 | } | |
4161 | ||
4162 | /* Create thread to manage application registration. */ | |
4163 | ret = pthread_create(®_apps_thread, NULL, | |
4164 | thread_registration_apps, (void *) NULL); | |
4165 | if (ret != 0) { | |
76d7553f | 4166 | PERROR("pthread_create registration"); |
099e26bd DG |
4167 | goto exit_reg_apps; |
4168 | } | |
4169 | ||
cf3af59e | 4170 | /* Create thread to manage application socket */ |
54d01ffb DG |
4171 | ret = pthread_create(&apps_thread, NULL, |
4172 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4173 | if (ret != 0) { |
76d7553f | 4174 | PERROR("pthread_create apps"); |
cf3af59e MD |
4175 | goto exit_apps; |
4176 | } | |
fac6795d | 4177 | |
6620da75 DG |
4178 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4179 | if (is_root && !opt_no_kernel) { | |
4180 | /* Create kernel thread to manage kernel event */ | |
4181 | ret = pthread_create(&kernel_thread, NULL, | |
4182 | thread_manage_kernel, (void *) NULL); | |
4183 | if (ret != 0) { | |
4184 | PERROR("pthread_create kernel"); | |
4185 | goto exit_kernel; | |
4186 | } | |
7a485870 | 4187 | |
6620da75 DG |
4188 | ret = pthread_join(kernel_thread, &status); |
4189 | if (ret != 0) { | |
4190 | PERROR("pthread_join"); | |
4191 | goto error; /* join error, exit without cleanup */ | |
4192 | } | |
fac6795d DG |
4193 | } |
4194 | ||
cf3af59e MD |
4195 | exit_kernel: |
4196 | ret = pthread_join(apps_thread, &status); | |
4197 | if (ret != 0) { | |
76d7553f | 4198 | PERROR("pthread_join"); |
cf3af59e MD |
4199 | goto error; /* join error, exit without cleanup */ |
4200 | } | |
fac6795d | 4201 | |
cf3af59e | 4202 | exit_apps: |
099e26bd DG |
4203 | ret = pthread_join(reg_apps_thread, &status); |
4204 | if (ret != 0) { | |
76d7553f | 4205 | PERROR("pthread_join"); |
099e26bd DG |
4206 | goto error; /* join error, exit without cleanup */ |
4207 | } | |
4208 | ||
4209 | exit_reg_apps: | |
4210 | ret = pthread_join(dispatch_thread, &status); | |
4211 | if (ret != 0) { | |
76d7553f | 4212 | PERROR("pthread_join"); |
099e26bd DG |
4213 | goto error; /* join error, exit without cleanup */ |
4214 | } | |
4215 | ||
4216 | exit_dispatch: | |
cf3af59e MD |
4217 | ret = pthread_join(client_thread, &status); |
4218 | if (ret != 0) { | |
76d7553f | 4219 | PERROR("pthread_join"); |
cf3af59e MD |
4220 | goto error; /* join error, exit without cleanup */ |
4221 | } | |
4222 | ||
3bd1e081 | 4223 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4224 | if (ret != 0) { |
76d7553f | 4225 | PERROR("join_consumer"); |
cf3af59e MD |
4226 | goto error; /* join error, exit without cleanup */ |
4227 | } | |
a88df331 | 4228 | |
06f525de DG |
4229 | ret = join_consumer_thread(&ustconsumer32_data); |
4230 | if (ret != 0) { | |
4231 | PERROR("join_consumer ust32"); | |
4232 | goto error; /* join error, exit without cleanup */ | |
4233 | } | |
4234 | ||
4235 | ret = join_consumer_thread(&ustconsumer64_data); | |
4236 | if (ret != 0) { | |
4237 | PERROR("join_consumer ust64"); | |
4238 | goto error; /* join error, exit without cleanup */ | |
4239 | } | |
4240 | ||
cf3af59e | 4241 | exit_client: |
06f525de DG |
4242 | ret = pthread_join(health_thread, &status); |
4243 | if (ret != 0) { | |
4244 | PERROR("pthread_join health thread"); | |
4245 | goto error; /* join error, exit without cleanup */ | |
4246 | } | |
4247 | ||
44a5e5eb | 4248 | exit_health: |
a88df331 | 4249 | exit: |
cf3af59e MD |
4250 | /* |
4251 | * cleanup() is called when no other thread is running. | |
4252 | */ | |
f6a9efaa | 4253 | rcu_thread_online(); |
cf3af59e | 4254 | cleanup(); |
f6a9efaa DG |
4255 | rcu_thread_offline(); |
4256 | rcu_unregister_thread(); | |
67e40797 | 4257 | if (!ret) { |
cf3af59e | 4258 | exit(EXIT_SUCCESS); |
67e40797 | 4259 | } |
cf3af59e | 4260 | error: |
5e16da05 | 4261 | exit(EXIT_FAILURE); |
fac6795d | 4262 | } |