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> | |
8c0faa1d | 24 | #include <semaphore.h> |
fac6795d DG |
25 | #include <signal.h> |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
0fdd1e2c | 29 | #include <sys/mman.h> |
b73401da | 30 | #include <sys/mount.h> |
1e307fab | 31 | #include <sys/resource.h> |
fac6795d DG |
32 | #include <sys/socket.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
0fdd1e2c | 35 | #include <sys/wait.h> |
5c827ce0 | 36 | #include <urcu/uatomic.h> |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.h> |
0ba98ebc | 41 | #include <common/compat/poll.h> |
d27c42b8 | 42 | #include <common/compat/socket.h> |
db758600 DG |
43 | #include <common/defaults.h> |
44 | #include <common/kernel-consumer/kernel-consumer.h> | |
45 | #include <common/ust-consumer/ust-consumer.h> | |
50c8f484 | 46 | #include <common/futex.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
099e26bd | 50 | #include "context.h" |
54d01ffb | 51 | #include "event.h" |
4771f025 | 52 | #include "kernel.h" |
f1e16794 | 53 | #include "kernel-consumer.h" |
096102bd | 54 | #include "modprobe.h" |
0fdd1e2c | 55 | #include "shm.h" |
1e307fab | 56 | #include "ust-ctl.h" |
8e68d1c8 | 57 | #include "utils.h" |
4063050c | 58 | #include "fd-limit.h" |
fac6795d | 59 | |
ebaeda94 MD |
60 | #define CONSUMERD_FILE "lttng-consumerd" |
61 | ||
75462a81 | 62 | /* Const values */ |
686204ab | 63 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 64 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
65 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
66 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
67 | ||
fac6795d DG |
68 | const char *progname; |
69 | const char *opt_tracing_group; | |
5b8719f5 | 70 | static int opt_sig_parent; |
97e19046 | 71 | static int opt_verbose_consumer; |
fac6795d | 72 | static int opt_daemon; |
4fba7219 | 73 | static int opt_no_kernel; |
fac6795d | 74 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 75 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 76 | static char *rundir; |
3bd1e081 MD |
77 | |
78 | /* Consumer daemon specific control data */ | |
79 | static struct consumer_data kconsumer_data = { | |
80 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
81 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
82 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
83 | .err_sock = -1, |
84 | .cmd_sock = -1, | |
3bd1e081 | 85 | }; |
7753dea8 MD |
86 | static struct consumer_data ustconsumer64_data = { |
87 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
88 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
89 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
90 | .err_sock = -1, |
91 | .cmd_sock = -1, | |
7753dea8 MD |
92 | }; |
93 | static struct consumer_data ustconsumer32_data = { | |
94 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
95 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
96 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
97 | .err_sock = -1, |
98 | .cmd_sock = -1, | |
3bd1e081 MD |
99 | }; |
100 | ||
099e26bd | 101 | static int dispatch_thread_exit; |
fac6795d | 102 | |
54d01ffb DG |
103 | /* Global application Unix socket path */ |
104 | static char apps_unix_sock_path[PATH_MAX]; | |
105 | /* Global client Unix socket path */ | |
106 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
107 | /* global wait shm path for UST */ |
108 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 109 | |
1d4b027a | 110 | /* Sockets and FDs */ |
a4b35e07 MD |
111 | static int client_sock = -1; |
112 | static int apps_sock = -1; | |
113 | static int kernel_tracer_fd = -1; | |
76d7553f | 114 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 115 | |
273ea72c DG |
116 | /* |
117 | * Quit pipe for all threads. This permits a single cancellation point | |
118 | * for all threads when receiving an event on the pipe. | |
119 | */ | |
76d7553f | 120 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 121 | |
099e26bd DG |
122 | /* |
123 | * This pipe is used to inform the thread managing application communication | |
124 | * that a command is queued and ready to be processed. | |
125 | */ | |
76d7553f | 126 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 127 | |
1d4b027a | 128 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 129 | static pthread_t apps_thread; |
099e26bd | 130 | static pthread_t reg_apps_thread; |
1d4b027a | 131 | static pthread_t client_thread; |
7a485870 | 132 | static pthread_t kernel_thread; |
099e26bd | 133 | static pthread_t dispatch_thread; |
5eb91c98 | 134 | |
fac6795d | 135 | |
099e26bd DG |
136 | /* |
137 | * UST registration command queue. This queue is tied with a futex and uses a N | |
138 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
139 | * | |
140 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
141 | * this queue and the wait/wake scheme. | |
142 | */ | |
143 | static struct ust_cmd_queue ust_cmd_queue; | |
144 | ||
b5541356 DG |
145 | /* |
146 | * Pointer initialized before thread creation. | |
147 | * | |
148 | * This points to the tracing session list containing the session count and a | |
149 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
150 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 151 | * |
d063d709 | 152 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 153 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
154 | */ |
155 | static struct ltt_session_list *session_list_ptr; | |
156 | ||
7753dea8 MD |
157 | int ust_consumerd64_fd = -1; |
158 | int ust_consumerd32_fd = -1; | |
159 | ||
fb6f1fa2 YB |
160 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
161 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
162 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
163 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 164 | |
5c827ce0 DG |
165 | /* |
166 | * Consumer daemon state which is changed when spawning it, killing it or in | |
167 | * case of a fatal error. | |
168 | */ | |
169 | enum consumerd_state { | |
170 | CONSUMER_STARTED = 1, | |
171 | CONSUMER_STOPPED = 2, | |
172 | CONSUMER_ERROR = 3, | |
173 | }; | |
174 | ||
175 | /* | |
176 | * This consumer daemon state is used to validate if a client command will be | |
177 | * able to reach the consumer. If not, the client is informed. For instance, | |
178 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
179 | * error to the client. | |
180 | * | |
181 | * The following example shows a possible race condition of this scheme: | |
182 | * | |
183 | * consumer thread error happens | |
184 | * client cmd arrives | |
185 | * client cmd checks state -> still OK | |
186 | * consumer thread exit, sets error | |
187 | * client cmd try to talk to consumer | |
188 | * ... | |
189 | * | |
190 | * However, since the consumer is a different daemon, we have no way of making | |
191 | * sure the command will reach it safely even with this state flag. This is why | |
192 | * we consider that up to the state validation during command processing, the | |
193 | * command is safe. After that, we can not guarantee the correctness of the | |
194 | * client request vis-a-vis the consumer. | |
195 | */ | |
196 | static enum consumerd_state ust_consumerd_state; | |
197 | static enum consumerd_state kernel_consumerd_state; | |
198 | ||
fb09408a | 199 | static |
7753dea8 | 200 | void setup_consumerd_path(void) |
fb09408a | 201 | { |
fc7a59ce | 202 | const char *bin, *libdir; |
fb09408a | 203 | |
7753dea8 MD |
204 | /* |
205 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
206 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
207 | * has not been defined. | |
7753dea8 | 208 | */ |
ebaeda94 | 209 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
210 | if (!consumerd32_bin[0]) { |
211 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
212 | } |
213 | if (!consumerd32_libdir[0]) { | |
214 | consumerd32_libdir = INSTALL_LIB_PATH; | |
215 | } | |
216 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
217 | if (!consumerd64_bin[0]) { |
218 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 219 | } |
ebaeda94 MD |
220 | if (!consumerd64_libdir[0]) { |
221 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
222 | } |
223 | #else | |
224 | #error "Unknown bitness" | |
225 | #endif | |
226 | ||
fb09408a MD |
227 | /* |
228 | * runtime env. var. overrides the build default. | |
229 | */ | |
fc7a59ce AM |
230 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
231 | if (bin) { | |
232 | consumerd32_bin = bin; | |
7753dea8 | 233 | } |
fc7a59ce AM |
234 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
235 | if (bin) { | |
236 | consumerd64_bin = bin; | |
ebaeda94 | 237 | } |
72f579ee | 238 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
239 | if (libdir) { |
240 | consumerd32_libdir = libdir; | |
241 | } | |
72f579ee | 242 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
243 | if (libdir) { |
244 | consumerd64_libdir = libdir; | |
fb09408a MD |
245 | } |
246 | } | |
247 | ||
5eb91c98 DG |
248 | /* |
249 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
250 | */ | |
251 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
252 | unsigned int size) | |
253 | { | |
254 | int ret; | |
255 | ||
256 | if (events == NULL || size == 0) { | |
257 | ret = -1; | |
258 | goto error; | |
259 | } | |
260 | ||
261 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
262 | if (ret < 0) { | |
263 | goto error; | |
264 | } | |
265 | ||
266 | /* Add quit pipe */ | |
267 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
268 | if (ret < 0) { | |
269 | goto error; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | ||
274 | error: | |
275 | return ret; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Check if the thread quit pipe was triggered. | |
280 | * | |
281 | * Return 1 if it was triggered else 0; | |
282 | */ | |
283 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
284 | { | |
285 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
286 | return 1; | |
287 | } | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
0fdd1e2c DG |
292 | /* |
293 | * Return group ID of the tracing group or -1 if not found. | |
294 | */ | |
996b65c8 MD |
295 | static gid_t allowed_group(void) |
296 | { | |
297 | struct group *grp; | |
298 | ||
274e143b MD |
299 | if (opt_tracing_group) { |
300 | grp = getgrnam(opt_tracing_group); | |
301 | } else { | |
302 | grp = getgrnam(default_tracing_group); | |
303 | } | |
996b65c8 MD |
304 | if (!grp) { |
305 | return -1; | |
306 | } else { | |
307 | return grp->gr_gid; | |
308 | } | |
309 | } | |
310 | ||
273ea72c | 311 | /* |
5eb91c98 | 312 | * Init thread quit pipe. |
273ea72c DG |
313 | * |
314 | * Return -1 on error or 0 if all pipes are created. | |
315 | */ | |
316 | static int init_thread_quit_pipe(void) | |
317 | { | |
730389d9 | 318 | int ret, i; |
273ea72c | 319 | |
730389d9 | 320 | ret = pipe(thread_quit_pipe); |
273ea72c | 321 | if (ret < 0) { |
730389d9 | 322 | PERROR("thread quit pipe"); |
273ea72c DG |
323 | goto error; |
324 | } | |
325 | ||
730389d9 DG |
326 | for (i = 0; i < 2; i++) { |
327 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
328 | if (ret < 0) { | |
329 | PERROR("fcntl"); | |
330 | goto error; | |
331 | } | |
332 | } | |
333 | ||
273ea72c DG |
334 | error: |
335 | return ret; | |
336 | } | |
337 | ||
fac6795d | 338 | /* |
d063d709 DG |
339 | * Complete teardown of a kernel session. This free all data structure related |
340 | * to a kernel session and update counter. | |
fac6795d | 341 | */ |
1d4b027a | 342 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 343 | { |
8f7a84dd | 344 | if (!session->kernel_session) { |
99bab54f | 345 | DBG3("No kernel session when tearing down session"); |
84ea9c99 | 346 | return; |
8f7a84dd DG |
347 | } |
348 | ||
84ea9c99 | 349 | DBG("Tearing down kernel session"); |
d9800920 | 350 | |
84ea9c99 MD |
351 | /* |
352 | * If a custom kernel consumer was registered, close the socket before | |
353 | * tearing down the complete kernel session structure | |
354 | */ | |
03550b58 MD |
355 | if (kconsumer_data.cmd_sock >= 0 && |
356 | session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
84ea9c99 | 357 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
fac6795d | 358 | } |
84ea9c99 MD |
359 | |
360 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
361 | } |
362 | ||
f6a9efaa DG |
363 | /* |
364 | * Complete teardown of all UST sessions. This will free everything on his path | |
365 | * and destroy the core essence of all ust sessions :) | |
366 | */ | |
367 | static void teardown_ust_session(struct ltt_session *session) | |
368 | { | |
84cd17c6 MD |
369 | int ret; |
370 | ||
8f7a84dd | 371 | if (!session->ust_session) { |
99bab54f | 372 | DBG3("No UST session when tearing down session"); |
f470a390 | 373 | return; |
8f7a84dd DG |
374 | } |
375 | ||
84ea9c99 | 376 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 377 | |
84cd17c6 MD |
378 | ret = ust_app_destroy_trace_all(session->ust_session); |
379 | if (ret) { | |
380 | ERR("Error in ust_app_destroy_trace_all"); | |
381 | } | |
8f7a84dd | 382 | |
f6a9efaa DG |
383 | trace_ust_destroy_session(session->ust_session); |
384 | } | |
385 | ||
099e26bd DG |
386 | /* |
387 | * Stop all threads by closing the thread quit pipe. | |
388 | */ | |
cf3af59e MD |
389 | static void stop_threads(void) |
390 | { | |
5eb91c98 DG |
391 | int ret; |
392 | ||
cf3af59e MD |
393 | /* Stopping all threads */ |
394 | DBG("Terminating all threads"); | |
54d01ffb | 395 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
396 | if (ret < 0) { |
397 | ERR("write error on thread quit pipe"); | |
398 | } | |
399 | ||
099e26bd DG |
400 | /* Dispatch thread */ |
401 | dispatch_thread_exit = 1; | |
402 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
403 | } |
404 | ||
fac6795d | 405 | /* |
d063d709 | 406 | * Cleanup the daemon |
fac6795d | 407 | */ |
cf3af59e | 408 | static void cleanup(void) |
fac6795d | 409 | { |
76d7553f | 410 | int ret, i; |
1d4b027a | 411 | char *cmd; |
af9737e9 | 412 | struct ltt_session *sess, *stmp; |
fac6795d | 413 | |
1d4b027a | 414 | DBG("Cleaning up"); |
e07ae692 | 415 | |
67e40797 DG |
416 | DBG("Removing %s directory", rundir); |
417 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
418 | if (ret < 0) { | |
419 | ERR("asprintf failed. Something is really wrong!"); | |
420 | } | |
5461b305 | 421 | |
67e40797 DG |
422 | /* Remove lttng run directory */ |
423 | ret = system(cmd); | |
424 | if (ret < 0) { | |
425 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 426 | } |
67e40797 | 427 | free(cmd); |
5461b305 | 428 | |
99bab54f | 429 | DBG("Cleaning up all sessions"); |
fac6795d | 430 | |
b5541356 | 431 | /* Destroy session list mutex */ |
273ea72c DG |
432 | if (session_list_ptr != NULL) { |
433 | pthread_mutex_destroy(&session_list_ptr->lock); | |
434 | ||
435 | /* Cleanup ALL session */ | |
54d01ffb DG |
436 | cds_list_for_each_entry_safe(sess, stmp, |
437 | &session_list_ptr->head, list) { | |
273ea72c | 438 | teardown_kernel_session(sess); |
f6a9efaa DG |
439 | teardown_ust_session(sess); |
440 | free(sess); | |
273ea72c DG |
441 | } |
442 | } | |
443 | ||
099e26bd | 444 | DBG("Closing all UST sockets"); |
56fff090 | 445 | ust_app_clean_list(); |
099e26bd | 446 | |
3bd1e081 | 447 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 448 | |
4fba7219 DG |
449 | if (is_root && !opt_no_kernel) { |
450 | DBG2("Closing kernel fd"); | |
a4b35e07 | 451 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
452 | ret = close(kernel_tracer_fd); |
453 | if (ret) { | |
454 | PERROR("close"); | |
455 | } | |
a4b35e07 | 456 | } |
2f50c8a3 | 457 | DBG("Unloading kernel modules"); |
096102bd | 458 | modprobe_remove_lttng_all(); |
2f50c8a3 | 459 | } |
5eb91c98 | 460 | |
76d7553f MD |
461 | /* |
462 | * Closing all pipes used for communication between threads. | |
463 | */ | |
464 | for (i = 0; i < 2; i++) { | |
465 | if (kernel_poll_pipe[i] >= 0) { | |
466 | ret = close(kernel_poll_pipe[i]); | |
467 | if (ret) { | |
468 | PERROR("close"); | |
469 | } | |
76d7553f MD |
470 | } |
471 | } | |
472 | for (i = 0; i < 2; i++) { | |
473 | if (thread_quit_pipe[i] >= 0) { | |
474 | ret = close(thread_quit_pipe[i]); | |
475 | if (ret) { | |
476 | PERROR("close"); | |
477 | } | |
478 | } | |
479 | } | |
480 | for (i = 0; i < 2; i++) { | |
481 | if (apps_cmd_pipe[i] >= 0) { | |
482 | ret = close(apps_cmd_pipe[i]); | |
483 | if (ret) { | |
484 | PERROR("close"); | |
485 | } | |
486 | } | |
487 | } | |
421cb601 DG |
488 | |
489 | /* <fun> */ | |
f56a39af | 490 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
491 | "Matthew, BEET driven development works!%c[%dm", |
492 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
493 | /* </fun> */ | |
fac6795d DG |
494 | } |
495 | ||
e065084a | 496 | /* |
d063d709 | 497 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 498 | * |
d063d709 | 499 | * Return lttcomm error code. |
e065084a DG |
500 | */ |
501 | static int send_unix_sock(int sock, void *buf, size_t len) | |
502 | { | |
503 | /* Check valid length */ | |
504 | if (len <= 0) { | |
505 | return -1; | |
506 | } | |
507 | ||
508 | return lttcomm_send_unix_sock(sock, buf, len); | |
509 | } | |
510 | ||
5461b305 | 511 | /* |
d063d709 | 512 | * Free memory of a command context structure. |
5461b305 | 513 | */ |
a2fb29a5 | 514 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 515 | { |
a2fb29a5 DG |
516 | DBG("Clean command context structure"); |
517 | if (*cmd_ctx) { | |
518 | if ((*cmd_ctx)->llm) { | |
519 | free((*cmd_ctx)->llm); | |
5461b305 | 520 | } |
a2fb29a5 DG |
521 | if ((*cmd_ctx)->lsm) { |
522 | free((*cmd_ctx)->lsm); | |
5461b305 | 523 | } |
a2fb29a5 DG |
524 | free(*cmd_ctx); |
525 | *cmd_ctx = NULL; | |
5461b305 DG |
526 | } |
527 | } | |
528 | ||
fac6795d | 529 | /* |
0fdd1e2c | 530 | * Notify UST applications using the shm mmap futex. |
fac6795d | 531 | */ |
0fdd1e2c | 532 | static int notify_ust_apps(int active) |
fac6795d | 533 | { |
0fdd1e2c | 534 | char *wait_shm_mmap; |
fac6795d | 535 | |
0fdd1e2c | 536 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 537 | |
0fdd1e2c DG |
538 | /* See shm.c for this call implying mmap, shm and futex calls */ |
539 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
540 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
541 | goto error; |
542 | } | |
543 | ||
0fdd1e2c DG |
544 | /* Wake waiting process */ |
545 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
546 | ||
547 | /* Apps notified successfully */ | |
548 | return 0; | |
fac6795d DG |
549 | |
550 | error: | |
0fdd1e2c | 551 | return -1; |
fac6795d DG |
552 | } |
553 | ||
e065084a | 554 | /* |
d063d709 DG |
555 | * Setup the outgoing data buffer for the response (llm) by allocating the |
556 | * right amount of memory and copying the original information from the lsm | |
557 | * structure. | |
ca95a216 | 558 | * |
d063d709 | 559 | * Return total size of the buffer pointed by buf. |
ca95a216 | 560 | */ |
5461b305 | 561 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 562 | { |
f3ed775e | 563 | int ret, buf_size; |
ca95a216 | 564 | |
f3ed775e | 565 | buf_size = size; |
5461b305 | 566 | |
ba7f0ae5 | 567 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 568 | if (cmd_ctx->llm == NULL) { |
76d7553f | 569 | PERROR("zmalloc"); |
5461b305 | 570 | ret = -ENOMEM; |
ca95a216 DG |
571 | goto error; |
572 | } | |
573 | ||
5461b305 DG |
574 | /* Copy common data */ |
575 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 576 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 577 | |
5461b305 DG |
578 | cmd_ctx->llm->data_size = size; |
579 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
580 | ||
ca95a216 DG |
581 | return buf_size; |
582 | ||
583 | error: | |
584 | return ret; | |
585 | } | |
586 | ||
7a485870 | 587 | /* |
5eb91c98 | 588 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 589 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 590 | */ |
5eb91c98 | 591 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 592 | { |
5eb91c98 | 593 | int ret; |
7a485870 DG |
594 | struct ltt_session *session; |
595 | struct ltt_kernel_channel *channel; | |
596 | ||
5eb91c98 | 597 | DBG("Updating kernel poll set"); |
7a485870 | 598 | |
54d01ffb | 599 | session_lock_list(); |
b5541356 | 600 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 601 | session_lock(session); |
7a485870 | 602 | if (session->kernel_session == NULL) { |
54d01ffb | 603 | session_unlock(session); |
7a485870 DG |
604 | continue; |
605 | } | |
7a485870 | 606 | |
54d01ffb DG |
607 | cds_list_for_each_entry(channel, |
608 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
609 | /* Add channel fd to the kernel poll set */ |
610 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
611 | if (ret < 0) { | |
54d01ffb | 612 | session_unlock(session); |
5eb91c98 DG |
613 | goto error; |
614 | } | |
615 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 616 | } |
54d01ffb | 617 | session_unlock(session); |
7a485870 | 618 | } |
54d01ffb | 619 | session_unlock_list(); |
7a485870 | 620 | |
5eb91c98 | 621 | return 0; |
7a485870 DG |
622 | |
623 | error: | |
54d01ffb | 624 | session_unlock_list(); |
7a485870 DG |
625 | return -1; |
626 | } | |
627 | ||
628 | /* | |
54d01ffb | 629 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 630 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 631 | * |
d063d709 | 632 | * Useful for CPU hotplug feature. |
7a485870 | 633 | */ |
2bdd86d4 | 634 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
635 | { |
636 | int ret = 0; | |
637 | struct ltt_session *session; | |
638 | struct ltt_kernel_channel *channel; | |
639 | ||
640 | DBG("Updating kernel streams for channel fd %d", fd); | |
641 | ||
54d01ffb | 642 | session_lock_list(); |
b5541356 | 643 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 644 | session_lock(session); |
7a485870 | 645 | if (session->kernel_session == NULL) { |
54d01ffb | 646 | session_unlock(session); |
7a485870 DG |
647 | continue; |
648 | } | |
d9800920 | 649 | |
03550b58 MD |
650 | /* This is not suppose to be -1 but this is an extra security check */ |
651 | if (session->kernel_session->consumer_fd < 0) { | |
3bd1e081 | 652 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
653 | } |
654 | ||
5eb91c98 DG |
655 | cds_list_for_each_entry(channel, |
656 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
657 | if (channel->fd == fd) { |
658 | DBG("Channel found, updating kernel streams"); | |
659 | ret = kernel_open_channel_stream(channel); | |
660 | if (ret < 0) { | |
b3c750d2 | 661 | goto error; |
7a485870 | 662 | } |
d9800920 | 663 | |
7a485870 | 664 | /* |
5eb91c98 DG |
665 | * Have we already sent fds to the consumer? If yes, it means |
666 | * that tracing is started so it is safe to send our updated | |
667 | * stream fds. | |
7a485870 | 668 | */ |
3bd1e081 | 669 | if (session->kernel_session->consumer_fds_sent == 1) { |
f1e16794 | 670 | ret = kernel_consumer_send_channel_stream(consumer_data, |
6df2e2c9 MD |
671 | session->kernel_session->consumer_fd, channel, |
672 | session->uid, session->gid); | |
7a485870 | 673 | if (ret < 0) { |
b3c750d2 | 674 | goto error; |
7a485870 DG |
675 | } |
676 | } | |
b3c750d2 | 677 | goto error; |
7a485870 DG |
678 | } |
679 | } | |
54d01ffb | 680 | session_unlock(session); |
7a485870 | 681 | } |
54d01ffb | 682 | session_unlock_list(); |
b3c750d2 | 683 | return ret; |
7a485870 | 684 | |
b3c750d2 | 685 | error: |
54d01ffb DG |
686 | session_unlock(session); |
687 | session_unlock_list(); | |
7a485870 DG |
688 | return ret; |
689 | } | |
690 | ||
487cf67c DG |
691 | /* |
692 | * For each tracing session, update newly registered apps. | |
693 | */ | |
694 | static void update_ust_app(int app_sock) | |
695 | { | |
696 | struct ltt_session *sess, *stmp; | |
697 | ||
4ee14516 DG |
698 | session_lock_list(); |
699 | ||
487cf67c DG |
700 | /* For all tracing session(s) */ |
701 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 702 | session_lock(sess); |
421cb601 DG |
703 | if (sess->ust_session) { |
704 | ust_app_global_update(sess->ust_session, app_sock); | |
705 | } | |
4ee14516 | 706 | session_unlock(sess); |
487cf67c | 707 | } |
4ee14516 DG |
708 | |
709 | session_unlock_list(); | |
487cf67c DG |
710 | } |
711 | ||
7a485870 | 712 | /* |
d063d709 | 713 | * This thread manage event coming from the kernel. |
7a485870 | 714 | * |
d063d709 DG |
715 | * Features supported in this thread: |
716 | * -) CPU Hotplug | |
7a485870 DG |
717 | */ |
718 | static void *thread_manage_kernel(void *data) | |
719 | { | |
5eb91c98 DG |
720 | int ret, i, pollfd, update_poll_flag = 1; |
721 | uint32_t revents, nb_fd; | |
7a485870 | 722 | char tmp; |
5eb91c98 | 723 | struct lttng_poll_event events; |
7a485870 DG |
724 | |
725 | DBG("Thread manage kernel started"); | |
726 | ||
5eb91c98 DG |
727 | ret = create_thread_poll_set(&events, 2); |
728 | if (ret < 0) { | |
76d7553f | 729 | goto error_poll_create; |
5eb91c98 DG |
730 | } |
731 | ||
732 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
733 | if (ret < 0) { | |
734 | goto error; | |
735 | } | |
736 | ||
7a485870 DG |
737 | while (1) { |
738 | if (update_poll_flag == 1) { | |
5f822d0a DG |
739 | /* |
740 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
741 | * quit pipe and the kernel pipe. | |
742 | */ | |
743 | events.nb_fd = 2; | |
744 | ||
5eb91c98 DG |
745 | ret = update_kernel_poll(&events); |
746 | if (ret < 0) { | |
7a485870 DG |
747 | goto error; |
748 | } | |
749 | update_poll_flag = 0; | |
750 | } | |
751 | ||
5eb91c98 DG |
752 | nb_fd = LTTNG_POLL_GETNB(&events); |
753 | ||
754 | DBG("Thread kernel polling on %d fds", nb_fd); | |
755 | ||
756 | /* Zeroed the poll events */ | |
757 | lttng_poll_reset(&events); | |
7a485870 DG |
758 | |
759 | /* Poll infinite value of time */ | |
88f2b785 | 760 | restart: |
5eb91c98 | 761 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 762 | if (ret < 0) { |
88f2b785 MD |
763 | /* |
764 | * Restart interrupted system call. | |
765 | */ | |
766 | if (errno == EINTR) { | |
767 | goto restart; | |
768 | } | |
7a485870 DG |
769 | goto error; |
770 | } else if (ret == 0) { | |
771 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
772 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
773 | "This should not have happened! Continuing..."); | |
7a485870 DG |
774 | continue; |
775 | } | |
776 | ||
5eb91c98 DG |
777 | for (i = 0; i < nb_fd; i++) { |
778 | /* Fetch once the poll data */ | |
779 | revents = LTTNG_POLL_GETEV(&events, i); | |
780 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 781 | |
5eb91c98 DG |
782 | /* Thread quit pipe has been closed. Killing thread. */ |
783 | ret = check_thread_quit_pipe(pollfd, revents); | |
784 | if (ret) { | |
785 | goto error; | |
786 | } | |
7a485870 | 787 | |
5eb91c98 DG |
788 | /* Check for data on kernel pipe */ |
789 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
790 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
791 | update_poll_flag = 1; | |
792 | continue; | |
793 | } else { | |
794 | /* | |
795 | * New CPU detected by the kernel. Adding kernel stream to | |
796 | * kernel session and updating the kernel consumer | |
797 | */ | |
798 | if (revents & LPOLLIN) { | |
2bdd86d4 | 799 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
800 | if (ret < 0) { |
801 | continue; | |
802 | } | |
803 | break; | |
804 | /* | |
805 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
806 | * and unregister kernel stream at this point. | |
807 | */ | |
7a485870 | 808 | } |
7a485870 DG |
809 | } |
810 | } | |
811 | } | |
812 | ||
813 | error: | |
5eb91c98 | 814 | lttng_poll_clean(&events); |
76d7553f MD |
815 | error_poll_create: |
816 | DBG("Kernel thread dying"); | |
7a485870 DG |
817 | return NULL; |
818 | } | |
819 | ||
1d4b027a | 820 | /* |
3bd1e081 | 821 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 822 | */ |
3bd1e081 | 823 | static void *thread_manage_consumer(void *data) |
1d4b027a | 824 | { |
76d7553f | 825 | int sock = -1, i, ret, pollfd; |
5eb91c98 | 826 | uint32_t revents, nb_fd; |
1d4b027a | 827 | enum lttcomm_return_code code; |
5eb91c98 | 828 | struct lttng_poll_event events; |
3bd1e081 | 829 | struct consumer_data *consumer_data = data; |
1d4b027a | 830 | |
3bd1e081 | 831 | DBG("[thread] Manage consumer started"); |
1d4b027a | 832 | |
3bd1e081 | 833 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a | 834 | if (ret < 0) { |
76d7553f | 835 | goto error_listen; |
1d4b027a DG |
836 | } |
837 | ||
5eb91c98 DG |
838 | /* |
839 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
840 | * Nothing more will be added to this poll set. | |
841 | */ | |
842 | ret = create_thread_poll_set(&events, 2); | |
843 | if (ret < 0) { | |
76d7553f | 844 | goto error_poll; |
5eb91c98 | 845 | } |
273ea72c | 846 | |
3bd1e081 | 847 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
848 | if (ret < 0) { |
849 | goto error; | |
850 | } | |
851 | ||
852 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
853 | |
854 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 855 | restart: |
5eb91c98 | 856 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 857 | if (ret < 0) { |
88f2b785 MD |
858 | /* |
859 | * Restart interrupted system call. | |
860 | */ | |
861 | if (errno == EINTR) { | |
862 | goto restart; | |
863 | } | |
273ea72c DG |
864 | goto error; |
865 | } | |
866 | ||
5eb91c98 DG |
867 | for (i = 0; i < nb_fd; i++) { |
868 | /* Fetch once the poll data */ | |
869 | revents = LTTNG_POLL_GETEV(&events, i); | |
870 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
871 | ||
872 | /* Thread quit pipe has been closed. Killing thread. */ | |
873 | ret = check_thread_quit_pipe(pollfd, revents); | |
874 | if (ret) { | |
875 | goto error; | |
876 | } | |
877 | ||
878 | /* Event on the registration socket */ | |
3bd1e081 | 879 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 880 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 881 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
882 | goto error; |
883 | } | |
884 | } | |
273ea72c DG |
885 | } |
886 | ||
3bd1e081 | 887 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
888 | if (sock < 0) { |
889 | goto error; | |
890 | } | |
891 | ||
3bd1e081 | 892 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 893 | |
712ea556 | 894 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
895 | ret = lttcomm_recv_unix_sock(sock, &code, |
896 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
897 | if (ret <= 0) { |
898 | goto error; | |
899 | } | |
900 | ||
3bd1e081 MD |
901 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
902 | consumer_data->cmd_sock = | |
903 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
904 | if (consumer_data->cmd_sock < 0) { | |
905 | sem_post(&consumer_data->sem); | |
48842b30 | 906 | PERROR("consumer connect"); |
1d4b027a DG |
907 | goto error; |
908 | } | |
909 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
910 | sem_post(&consumer_data->sem); |
911 | DBG("consumer command socket ready"); | |
1d4b027a | 912 | } else { |
3bd1e081 | 913 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
914 | lttcomm_get_readable_code(-code)); |
915 | goto error; | |
916 | } | |
917 | ||
54d01ffb | 918 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 919 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 920 | if (ret < 0) { |
72079cae DG |
921 | goto error; |
922 | } | |
923 | ||
5eb91c98 DG |
924 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
925 | if (ret < 0) { | |
72079cae | 926 | goto error; |
5eb91c98 DG |
927 | } |
928 | ||
929 | /* Update number of fd */ | |
930 | nb_fd = LTTNG_POLL_GETNB(&events); | |
931 | ||
932 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 933 | restart_poll: |
5eb91c98 DG |
934 | ret = lttng_poll_wait(&events, -1); |
935 | if (ret < 0) { | |
88f2b785 MD |
936 | /* |
937 | * Restart interrupted system call. | |
938 | */ | |
939 | if (errno == EINTR) { | |
940 | goto restart_poll; | |
941 | } | |
72079cae DG |
942 | goto error; |
943 | } | |
944 | ||
5eb91c98 DG |
945 | for (i = 0; i < nb_fd; i++) { |
946 | /* Fetch once the poll data */ | |
947 | revents = LTTNG_POLL_GETEV(&events, i); | |
948 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
949 | ||
950 | /* Thread quit pipe has been closed. Killing thread. */ | |
951 | ret = check_thread_quit_pipe(pollfd, revents); | |
952 | if (ret) { | |
953 | goto error; | |
954 | } | |
955 | ||
956 | /* Event on the kconsumerd socket */ | |
957 | if (pollfd == sock) { | |
958 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 959 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
960 | goto error; |
961 | } | |
962 | } | |
963 | } | |
964 | ||
712ea556 | 965 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
966 | ret = lttcomm_recv_unix_sock(sock, &code, |
967 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 968 | if (ret <= 0) { |
3bd1e081 | 969 | ERR("consumer closed the command socket"); |
712ea556 | 970 | goto error; |
6f61d021 | 971 | } |
1d4b027a | 972 | |
3bd1e081 | 973 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 974 | |
1d4b027a | 975 | error: |
5c827ce0 DG |
976 | /* Immediately set the consumerd state to stopped */ |
977 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
978 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
979 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
980 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
981 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
982 | } else { | |
983 | /* Code flow error... */ | |
984 | assert(0); | |
985 | } | |
986 | ||
76d7553f MD |
987 | if (consumer_data->err_sock >= 0) { |
988 | ret = close(consumer_data->err_sock); | |
989 | if (ret) { | |
990 | PERROR("close"); | |
991 | } | |
992 | } | |
993 | if (consumer_data->cmd_sock >= 0) { | |
994 | ret = close(consumer_data->cmd_sock); | |
995 | if (ret) { | |
996 | PERROR("close"); | |
997 | } | |
998 | } | |
999 | if (sock >= 0) { | |
1000 | ret = close(sock); | |
1001 | if (ret) { | |
1002 | PERROR("close"); | |
1003 | } | |
1004 | } | |
273ea72c | 1005 | |
3bd1e081 MD |
1006 | unlink(consumer_data->err_unix_sock_path); |
1007 | unlink(consumer_data->cmd_unix_sock_path); | |
1008 | consumer_data->pid = 0; | |
1d4b027a | 1009 | |
5eb91c98 | 1010 | lttng_poll_clean(&events); |
76d7553f MD |
1011 | error_poll: |
1012 | error_listen: | |
1013 | DBG("consumer thread cleanup completed"); | |
0177d773 | 1014 | |
5eb91c98 | 1015 | return NULL; |
099e26bd DG |
1016 | } |
1017 | ||
099e26bd DG |
1018 | /* |
1019 | * This thread manage application communication. | |
1d4b027a DG |
1020 | */ |
1021 | static void *thread_manage_apps(void *data) | |
099e26bd | 1022 | { |
5eb91c98 DG |
1023 | int i, ret, pollfd; |
1024 | uint32_t revents, nb_fd; | |
099e26bd | 1025 | struct ust_command ust_cmd; |
5eb91c98 | 1026 | struct lttng_poll_event events; |
099e26bd DG |
1027 | |
1028 | DBG("[thread] Manage application started"); | |
1029 | ||
f6a9efaa DG |
1030 | rcu_register_thread(); |
1031 | rcu_thread_online(); | |
1032 | ||
5eb91c98 DG |
1033 | ret = create_thread_poll_set(&events, 2); |
1034 | if (ret < 0) { | |
76d7553f | 1035 | goto error_poll_create; |
5eb91c98 | 1036 | } |
099e26bd | 1037 | |
5eb91c98 DG |
1038 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1039 | if (ret < 0) { | |
1040 | goto error; | |
1041 | } | |
099e26bd | 1042 | |
5eb91c98 DG |
1043 | while (1) { |
1044 | /* Zeroed the events structure */ | |
1045 | lttng_poll_reset(&events); | |
0177d773 | 1046 | |
5eb91c98 | 1047 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1048 | |
1049 | DBG("Apps thread polling on %d fds", nb_fd); | |
1050 | ||
1051 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1052 | restart: |
5eb91c98 | 1053 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1054 | if (ret < 0) { |
88f2b785 MD |
1055 | /* |
1056 | * Restart interrupted system call. | |
1057 | */ | |
1058 | if (errno == EINTR) { | |
1059 | goto restart; | |
1060 | } | |
099e26bd DG |
1061 | goto error; |
1062 | } | |
1063 | ||
5eb91c98 DG |
1064 | for (i = 0; i < nb_fd; i++) { |
1065 | /* Fetch once the poll data */ | |
1066 | revents = LTTNG_POLL_GETEV(&events, i); | |
1067 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1068 | ||
1069 | /* Thread quit pipe has been closed. Killing thread. */ | |
1070 | ret = check_thread_quit_pipe(pollfd, revents); | |
1071 | if (ret) { | |
099e26bd | 1072 | goto error; |
5eb91c98 | 1073 | } |
099e26bd | 1074 | |
5eb91c98 DG |
1075 | /* Inspect the apps cmd pipe */ |
1076 | if (pollfd == apps_cmd_pipe[0]) { | |
1077 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1078 | ERR("Apps command pipe error"); | |
0177d773 | 1079 | goto error; |
5eb91c98 DG |
1080 | } else if (revents & LPOLLIN) { |
1081 | /* Empty pipe */ | |
1082 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1083 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
76d7553f | 1084 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1085 | goto error; |
1086 | } | |
099e26bd | 1087 | |
5eb91c98 | 1088 | /* Register applicaton to the session daemon */ |
56fff090 | 1089 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1090 | ust_cmd.sock); |
88ff5b7f | 1091 | if (ret == -ENOMEM) { |
5eb91c98 | 1092 | goto error; |
88ff5b7f MD |
1093 | } else if (ret < 0) { |
1094 | break; | |
5eb91c98 DG |
1095 | } |
1096 | ||
acc7b41b | 1097 | /* |
e0c7ec2b | 1098 | * Validate UST version compatibility. |
acc7b41b | 1099 | */ |
e0c7ec2b DG |
1100 | ret = ust_app_validate_version(ust_cmd.sock); |
1101 | if (ret >= 0) { | |
1102 | /* | |
1103 | * Add channel(s) and event(s) to newly registered apps | |
1104 | * from lttng global UST domain. | |
1105 | */ | |
1106 | update_ust_app(ust_cmd.sock); | |
1107 | } | |
acc7b41b | 1108 | |
f2ca2e25 | 1109 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1110 | if (ret < 0) { |
1111 | /* | |
1112 | * If the registration is not possible, we simply | |
1113 | * unregister the apps and continue | |
1114 | */ | |
56fff090 | 1115 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1116 | } else { |
1117 | /* | |
1118 | * We just need here to monitor the close of the UST | |
1119 | * socket and poll set monitor those by default. | |
a9ade966 MD |
1120 | * Listen on POLLIN (even if we never expect any |
1121 | * data) to ensure that hangup wakes us. | |
5eb91c98 | 1122 | */ |
a9ade966 | 1123 | ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN); |
5eb91c98 DG |
1124 | if (ret < 0) { |
1125 | goto error; | |
1126 | } | |
1127 | ||
54d01ffb DG |
1128 | DBG("Apps with sock %d added to poll set", |
1129 | ust_cmd.sock); | |
5eb91c98 | 1130 | } |
487cf67c | 1131 | |
5eb91c98 | 1132 | break; |
0177d773 | 1133 | } |
5eb91c98 DG |
1134 | } else { |
1135 | /* | |
54d01ffb DG |
1136 | * At this point, we know that a registered application made |
1137 | * the event at poll_wait. | |
5eb91c98 DG |
1138 | */ |
1139 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1140 | /* Removing from the poll set */ | |
1141 | ret = lttng_poll_del(&events, pollfd); | |
1142 | if (ret < 0) { | |
1143 | goto error; | |
1144 | } | |
099e26bd | 1145 | |
b9d9b220 | 1146 | /* Socket closed on remote end. */ |
56fff090 | 1147 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1148 | break; |
1149 | } | |
099e26bd DG |
1150 | } |
1151 | } | |
099e26bd DG |
1152 | } |
1153 | ||
1154 | error: | |
5eb91c98 | 1155 | lttng_poll_clean(&events); |
76d7553f MD |
1156 | error_poll_create: |
1157 | DBG("Application communication apps thread cleanup complete"); | |
f6a9efaa DG |
1158 | rcu_thread_offline(); |
1159 | rcu_unregister_thread(); | |
099e26bd DG |
1160 | return NULL; |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Dispatch request from the registration threads to the application | |
1165 | * communication thread. | |
1166 | */ | |
1167 | static void *thread_dispatch_ust_registration(void *data) | |
1168 | { | |
1169 | int ret; | |
1170 | struct cds_wfq_node *node; | |
1171 | struct ust_command *ust_cmd = NULL; | |
1172 | ||
1173 | DBG("[thread] Dispatch UST command started"); | |
1174 | ||
1175 | while (!dispatch_thread_exit) { | |
1176 | /* Atomically prepare the queue futex */ | |
1177 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1178 | ||
1179 | do { | |
1180 | /* Dequeue command for registration */ | |
1181 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1182 | if (node == NULL) { | |
00a17c97 | 1183 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1184 | /* Continue thread execution */ |
1185 | break; | |
1186 | } | |
1187 | ||
1188 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1189 | ||
2f50c8a3 DG |
1190 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1191 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1192 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1193 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1194 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1195 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1196 | /* |
1197 | * Inform apps thread of the new application registration. This | |
1198 | * call is blocking so we can be assured that the data will be read | |
1199 | * at some point in time or wait to the end of the world :) | |
1200 | */ | |
1201 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1202 | sizeof(struct ust_command)); | |
1203 | if (ret < 0) { | |
76d7553f | 1204 | PERROR("write apps cmd pipe"); |
099e26bd DG |
1205 | if (errno == EBADF) { |
1206 | /* | |
1207 | * We can't inform the application thread to process | |
1208 | * registration. We will exit or else application | |
1209 | * registration will not occur and tracing will never | |
1210 | * start. | |
1211 | */ | |
1212 | goto error; | |
1213 | } | |
1214 | } | |
1215 | free(ust_cmd); | |
1216 | } while (node != NULL); | |
1217 | ||
1218 | /* Futex wait on queue. Blocking call on futex() */ | |
1219 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1220 | } | |
1221 | ||
1222 | error: | |
1223 | DBG("Dispatch thread dying"); | |
1224 | return NULL; | |
1225 | } | |
1226 | ||
1227 | /* | |
1228 | * This thread manage application registration. | |
1229 | */ | |
1230 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1231 | { |
a4b35e07 | 1232 | int sock = -1, i, ret, pollfd; |
5eb91c98 DG |
1233 | uint32_t revents, nb_fd; |
1234 | struct lttng_poll_event events; | |
099e26bd DG |
1235 | /* |
1236 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1237 | * freed in the manage apps thread. | |
1238 | */ | |
1239 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1240 | |
099e26bd | 1241 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1242 | |
1243 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1244 | if (ret < 0) { | |
76d7553f | 1245 | goto error_listen; |
1d4b027a DG |
1246 | } |
1247 | ||
5eb91c98 DG |
1248 | /* |
1249 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1250 | * more will be added to this poll set. | |
1251 | */ | |
1252 | ret = create_thread_poll_set(&events, 2); | |
1253 | if (ret < 0) { | |
76d7553f | 1254 | goto error_create_poll; |
5eb91c98 | 1255 | } |
273ea72c | 1256 | |
5eb91c98 DG |
1257 | /* Add the application registration socket */ |
1258 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1259 | if (ret < 0) { | |
76d7553f | 1260 | goto error_poll_add; |
5eb91c98 | 1261 | } |
273ea72c | 1262 | |
1d4b027a | 1263 | /* Notify all applications to register */ |
0fdd1e2c DG |
1264 | ret = notify_ust_apps(1); |
1265 | if (ret < 0) { | |
1266 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1267 | "Execution continues but there might be problem for already\n" |
1268 | "running applications that wishes to register."); | |
0fdd1e2c | 1269 | } |
1d4b027a DG |
1270 | |
1271 | while (1) { | |
1272 | DBG("Accepting application registration"); | |
273ea72c | 1273 | |
5eb91c98 DG |
1274 | nb_fd = LTTNG_POLL_GETNB(&events); |
1275 | ||
273ea72c | 1276 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1277 | restart: |
5eb91c98 | 1278 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1279 | if (ret < 0) { |
88f2b785 MD |
1280 | /* |
1281 | * Restart interrupted system call. | |
1282 | */ | |
1283 | if (errno == EINTR) { | |
1284 | goto restart; | |
1285 | } | |
273ea72c DG |
1286 | goto error; |
1287 | } | |
1288 | ||
5eb91c98 DG |
1289 | for (i = 0; i < nb_fd; i++) { |
1290 | /* Fetch once the poll data */ | |
1291 | revents = LTTNG_POLL_GETEV(&events, i); | |
1292 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1293 | |
5eb91c98 DG |
1294 | /* Thread quit pipe has been closed. Killing thread. */ |
1295 | ret = check_thread_quit_pipe(pollfd, revents); | |
1296 | if (ret) { | |
90014c57 DG |
1297 | goto error; |
1298 | } | |
1d4b027a | 1299 | |
5eb91c98 DG |
1300 | /* Event on the registration socket */ |
1301 | if (pollfd == apps_sock) { | |
1302 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1303 | ERR("Register apps socket poll error"); | |
1304 | goto error; | |
1305 | } else if (revents & LPOLLIN) { | |
1306 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1307 | if (sock < 0) { | |
1308 | goto error; | |
1309 | } | |
099e26bd | 1310 | |
5eb91c98 | 1311 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1312 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1313 | if (ust_cmd == NULL) { |
76d7553f | 1314 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1315 | goto error; |
1316 | } | |
1d4b027a | 1317 | |
5eb91c98 DG |
1318 | /* |
1319 | * Using message-based transmissions to ensure we don't | |
1320 | * have to deal with partially received messages. | |
1321 | */ | |
4063050c MD |
1322 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1323 | if (ret < 0) { | |
1324 | ERR("Exhausted file descriptors allowed for applications."); | |
1325 | free(ust_cmd); | |
1326 | ret = close(sock); | |
1327 | if (ret) { | |
1328 | PERROR("close"); | |
1329 | } | |
1330 | sock = -1; | |
1331 | continue; | |
1332 | } | |
5eb91c98 DG |
1333 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1334 | sizeof(struct ust_register_msg)); | |
1335 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1336 | if (ret < 0) { | |
76d7553f | 1337 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1338 | } else { |
1339 | ERR("Wrong size received on apps register"); | |
1340 | } | |
1341 | free(ust_cmd); | |
76d7553f MD |
1342 | ret = close(sock); |
1343 | if (ret) { | |
1344 | PERROR("close"); | |
1345 | } | |
4063050c | 1346 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1347 | sock = -1; |
5eb91c98 DG |
1348 | continue; |
1349 | } | |
099e26bd | 1350 | |
5eb91c98 | 1351 | ust_cmd->sock = sock; |
34a2494f | 1352 | sock = -1; |
099e26bd | 1353 | |
5eb91c98 DG |
1354 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1355 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1356 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1357 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1358 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1359 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1360 | |
5eb91c98 DG |
1361 | /* |
1362 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1363 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1364 | */ |
1365 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1366 | ||
1367 | /* | |
1368 | * Wake the registration queue futex. Implicit memory | |
1369 | * barrier with the exchange in cds_wfq_enqueue. | |
1370 | */ | |
1371 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1372 | } | |
1373 | } | |
90014c57 | 1374 | } |
1d4b027a DG |
1375 | } |
1376 | ||
1377 | error: | |
0fdd1e2c DG |
1378 | /* Notify that the registration thread is gone */ |
1379 | notify_ust_apps(0); | |
1380 | ||
a4b35e07 | 1381 | if (apps_sock >= 0) { |
76d7553f MD |
1382 | ret = close(apps_sock); |
1383 | if (ret) { | |
1384 | PERROR("close"); | |
1385 | } | |
a4b35e07 | 1386 | } |
46c3f085 | 1387 | if (sock >= 0) { |
76d7553f MD |
1388 | ret = close(sock); |
1389 | if (ret) { | |
1390 | PERROR("close"); | |
1391 | } | |
4063050c | 1392 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1393 | } |
273ea72c | 1394 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1395 | |
76d7553f | 1396 | error_poll_add: |
5eb91c98 | 1397 | lttng_poll_clean(&events); |
76d7553f MD |
1398 | error_listen: |
1399 | error_create_poll: | |
1400 | DBG("UST Registration thread cleanup complete"); | |
5eb91c98 | 1401 | |
1d4b027a DG |
1402 | return NULL; |
1403 | } | |
1404 | ||
8c0faa1d | 1405 | /* |
3bd1e081 | 1406 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1407 | * exec or it will fails. |
8c0faa1d | 1408 | */ |
3bd1e081 | 1409 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1410 | { |
1411 | int ret; | |
ee0b0061 DG |
1412 | struct timespec timeout; |
1413 | ||
1414 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1415 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1416 | |
1417 | /* Setup semaphore */ | |
3bd1e081 | 1418 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1419 | if (ret < 0) { |
3bd1e081 | 1420 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1421 | goto error; |
1422 | } | |
8c0faa1d | 1423 | |
3bd1e081 MD |
1424 | ret = pthread_create(&consumer_data->thread, NULL, |
1425 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1426 | if (ret != 0) { |
3bd1e081 | 1427 | PERROR("pthread_create consumer"); |
ee0b0061 | 1428 | ret = -1; |
8c0faa1d DG |
1429 | goto error; |
1430 | } | |
1431 | ||
ee0b0061 DG |
1432 | /* Get time for sem_timedwait absolute timeout */ |
1433 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1434 | if (ret < 0) { | |
3bd1e081 | 1435 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1436 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1437 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1438 | } else { |
1439 | /* Normal timeout if the gettime was successful */ | |
1440 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1441 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1442 | } |
8c0faa1d | 1443 | |
ee0b0061 DG |
1444 | if (ret < 0) { |
1445 | if (errno == ETIMEDOUT) { | |
1446 | /* | |
1447 | * Call has timed out so we kill the kconsumerd_thread and return | |
1448 | * an error. | |
1449 | */ | |
3bd1e081 MD |
1450 | ERR("The consumer thread was never ready. Killing it"); |
1451 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1452 | if (ret < 0) { |
3bd1e081 | 1453 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1454 | } |
1455 | } else { | |
3bd1e081 | 1456 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1457 | } |
1458 | goto error; | |
1459 | } | |
1460 | ||
3bd1e081 MD |
1461 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1462 | if (consumer_data->pid == 0) { | |
712ea556 | 1463 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1464 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1465 | goto error; |
1466 | } | |
3bd1e081 | 1467 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1468 | |
8c0faa1d DG |
1469 | return 0; |
1470 | ||
1471 | error: | |
1472 | return ret; | |
1473 | } | |
1474 | ||
d9800920 | 1475 | /* |
3bd1e081 | 1476 | * Join consumer thread |
d9800920 | 1477 | */ |
3bd1e081 | 1478 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1479 | { |
1480 | void *status; | |
1481 | int ret; | |
1482 | ||
3bd1e081 MD |
1483 | if (consumer_data->pid != 0) { |
1484 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1485 | if (ret) { |
3bd1e081 | 1486 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1487 | return ret; |
1488 | } | |
3bd1e081 | 1489 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1490 | } else { |
1491 | return 0; | |
1492 | } | |
1493 | } | |
1494 | ||
8c0faa1d | 1495 | /* |
3bd1e081 | 1496 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1497 | * |
d063d709 | 1498 | * Return pid if successful else -1. |
8c0faa1d | 1499 | */ |
3bd1e081 | 1500 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1501 | { |
1502 | int ret; | |
1503 | pid_t pid; | |
94c55f17 | 1504 | const char *consumer_to_use; |
53086306 | 1505 | const char *verbosity; |
94c55f17 | 1506 | struct stat st; |
8c0faa1d | 1507 | |
3bd1e081 | 1508 | DBG("Spawning consumerd"); |
c49dc785 | 1509 | |
8c0faa1d DG |
1510 | pid = fork(); |
1511 | if (pid == 0) { | |
1512 | /* | |
3bd1e081 | 1513 | * Exec consumerd. |
8c0faa1d | 1514 | */ |
daee5345 | 1515 | if (opt_verbose_consumer) { |
53086306 DG |
1516 | verbosity = "--verbose"; |
1517 | } else { | |
1518 | verbosity = "--quiet"; | |
1519 | } | |
3bd1e081 MD |
1520 | switch (consumer_data->type) { |
1521 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1522 | /* |
c7704d57 DG |
1523 | * Find out which consumerd to execute. We will first try the |
1524 | * 64-bit path, then the sessiond's installation directory, and | |
1525 | * fallback on the 32-bit one, | |
94c55f17 | 1526 | */ |
63a799e8 AM |
1527 | DBG3("Looking for a kernel consumer at these locations:"); |
1528 | DBG3(" 1) %s", consumerd64_bin); | |
1529 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1530 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1531 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1532 | DBG3("Found location #1"); |
94c55f17 | 1533 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1534 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1535 | DBG3("Found location #2"); |
94c55f17 | 1536 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1537 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1538 | DBG3("Found location #3"); |
eb1e0bd4 | 1539 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1540 | } else { |
63a799e8 | 1541 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1542 | break; |
1543 | } | |
1544 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1545 | execl(consumer_to_use, | |
1546 | "lttng-consumerd", verbosity, "-k", | |
1547 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1548 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1549 | NULL); | |
3bd1e081 | 1550 | break; |
7753dea8 MD |
1551 | case LTTNG_CONSUMER64_UST: |
1552 | { | |
b1e0b6b6 | 1553 | char *tmpnew = NULL; |
8f4905da MD |
1554 | |
1555 | if (consumerd64_libdir[0] != '\0') { | |
1556 | char *tmp; | |
1557 | size_t tmplen; | |
1558 | ||
1559 | tmp = getenv("LD_LIBRARY_PATH"); | |
1560 | if (!tmp) { | |
1561 | tmp = ""; | |
1562 | } | |
1563 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1564 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1565 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1566 | if (!tmpnew) { | |
1567 | ret = -ENOMEM; | |
1568 | goto error; | |
1569 | } | |
1570 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1571 | strcat(tmpnew, consumerd64_libdir); | |
1572 | if (tmp[0] != '\0') { | |
1573 | strcat(tmpnew, ":"); | |
1574 | strcat(tmpnew, tmp); | |
1575 | } | |
1576 | ret = putenv(tmpnew); | |
1577 | if (ret) { | |
1578 | ret = -errno; | |
1579 | goto error; | |
1580 | } | |
1581 | } | |
94c55f17 | 1582 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1583 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1584 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1585 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1586 | NULL); | |
8f4905da MD |
1587 | if (consumerd64_libdir[0] != '\0') { |
1588 | free(tmpnew); | |
1589 | } | |
1590 | if (ret) { | |
1591 | goto error; | |
1592 | } | |
3bd1e081 | 1593 | break; |
7753dea8 MD |
1594 | } |
1595 | case LTTNG_CONSUMER32_UST: | |
1596 | { | |
937dde8e | 1597 | char *tmpnew = NULL; |
8f4905da MD |
1598 | |
1599 | if (consumerd32_libdir[0] != '\0') { | |
1600 | char *tmp; | |
1601 | size_t tmplen; | |
1602 | ||
1603 | tmp = getenv("LD_LIBRARY_PATH"); | |
1604 | if (!tmp) { | |
1605 | tmp = ""; | |
1606 | } | |
1607 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1608 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1609 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1610 | if (!tmpnew) { | |
1611 | ret = -ENOMEM; | |
1612 | goto error; | |
1613 | } | |
1614 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1615 | strcat(tmpnew, consumerd32_libdir); | |
1616 | if (tmp[0] != '\0') { | |
1617 | strcat(tmpnew, ":"); | |
1618 | strcat(tmpnew, tmp); | |
1619 | } | |
1620 | ret = putenv(tmpnew); | |
1621 | if (ret) { | |
1622 | ret = -errno; | |
1623 | goto error; | |
1624 | } | |
1625 | } | |
94c55f17 | 1626 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1627 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1628 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1629 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1630 | NULL); | |
8f4905da MD |
1631 | if (consumerd32_libdir[0] != '\0') { |
1632 | free(tmpnew); | |
1633 | } | |
1634 | if (ret) { | |
1635 | goto error; | |
1636 | } | |
7753dea8 MD |
1637 | break; |
1638 | } | |
3bd1e081 | 1639 | default: |
76d7553f | 1640 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1641 | exit(EXIT_FAILURE); |
1642 | } | |
8c0faa1d | 1643 | if (errno != 0) { |
76d7553f | 1644 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1645 | } |
1646 | exit(EXIT_FAILURE); | |
1647 | } else if (pid > 0) { | |
1648 | ret = pid; | |
8c0faa1d | 1649 | } else { |
76d7553f | 1650 | PERROR("start consumer fork"); |
8c0faa1d | 1651 | ret = -errno; |
8c0faa1d | 1652 | } |
8f4905da | 1653 | error: |
8c0faa1d DG |
1654 | return ret; |
1655 | } | |
1656 | ||
693bd40b | 1657 | /* |
3bd1e081 | 1658 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1659 | */ |
3bd1e081 | 1660 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1661 | { |
1662 | int ret; | |
1663 | ||
3bd1e081 MD |
1664 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1665 | if (consumer_data->pid != 0) { | |
1666 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1667 | goto end; |
1668 | } | |
693bd40b | 1669 | |
3bd1e081 | 1670 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1671 | if (ret < 0) { |
3bd1e081 MD |
1672 | ERR("Spawning consumerd failed"); |
1673 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1674 | goto error; |
693bd40b | 1675 | } |
c49dc785 | 1676 | |
3bd1e081 MD |
1677 | /* Setting up the consumer_data pid */ |
1678 | consumer_data->pid = ret; | |
48842b30 | 1679 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1680 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1681 | |
3bd1e081 MD |
1682 | DBG2("Spawning consumer control thread"); |
1683 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1684 | if (ret < 0) { |
3bd1e081 | 1685 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1686 | goto error; |
1687 | } | |
1688 | ||
c49dc785 | 1689 | end: |
693bd40b DG |
1690 | return 0; |
1691 | ||
1692 | error: | |
1693 | return ret; | |
1694 | } | |
1695 | ||
b73401da | 1696 | /* |
096102bd | 1697 | * Check version of the lttng-modules. |
b73401da | 1698 | */ |
096102bd | 1699 | static int validate_lttng_modules_version(void) |
b73401da | 1700 | { |
096102bd | 1701 | return kernel_validate_version(kernel_tracer_fd); |
ab147185 MD |
1702 | } |
1703 | ||
b73401da | 1704 | /* |
096102bd | 1705 | * Setup necessary data for kernel tracer action. |
b73401da | 1706 | */ |
096102bd | 1707 | static int init_kernel_tracer(void) |
b73401da DG |
1708 | { |
1709 | int ret; | |
b73401da | 1710 | |
096102bd DG |
1711 | /* Modprobe lttng kernel modules */ |
1712 | ret = modprobe_lttng_control(); | |
b73401da | 1713 | if (ret < 0) { |
b73401da DG |
1714 | goto error; |
1715 | } | |
1716 | ||
096102bd DG |
1717 | /* Open debugfs lttng */ |
1718 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1719 | if (kernel_tracer_fd < 0) { | |
1720 | DBG("Failed to open %s", module_proc_lttng); | |
1721 | ret = -1; | |
1722 | goto error_open; | |
b73401da DG |
1723 | } |
1724 | ||
096102bd DG |
1725 | /* Validate kernel version */ |
1726 | ret = validate_lttng_modules_version(); | |
b73401da | 1727 | if (ret < 0) { |
096102bd | 1728 | goto error_version; |
b73401da DG |
1729 | } |
1730 | ||
096102bd | 1731 | ret = modprobe_lttng_data(); |
b73401da | 1732 | if (ret < 0) { |
096102bd | 1733 | goto error_modules; |
8c0faa1d DG |
1734 | } |
1735 | ||
f3ed775e | 1736 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
096102bd DG |
1737 | return 0; |
1738 | ||
1739 | error_version: | |
1740 | modprobe_remove_lttng_control(); | |
76d7553f MD |
1741 | ret = close(kernel_tracer_fd); |
1742 | if (ret) { | |
1743 | PERROR("close"); | |
1744 | } | |
1745 | kernel_tracer_fd = -1; | |
096102bd DG |
1746 | return LTTCOMM_KERN_VERSION; |
1747 | ||
1748 | error_modules: | |
76d7553f MD |
1749 | ret = close(kernel_tracer_fd); |
1750 | if (ret) { | |
1751 | PERROR("close"); | |
1752 | } | |
096102bd DG |
1753 | |
1754 | error_open: | |
1755 | modprobe_remove_lttng_control(); | |
b73401da DG |
1756 | |
1757 | error: | |
b73401da | 1758 | WARN("No kernel tracer available"); |
a4b35e07 | 1759 | kernel_tracer_fd = -1; |
531d29f9 MD |
1760 | if (!is_root) { |
1761 | return LTTCOMM_NEED_ROOT_SESSIOND; | |
1762 | } else { | |
1763 | return LTTCOMM_KERN_NA; | |
1764 | } | |
f3ed775e | 1765 | } |
33a2b854 | 1766 | |
f3ed775e | 1767 | /* |
54d01ffb | 1768 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1769 | */ |
54d01ffb | 1770 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1771 | { |
f40799e8 | 1772 | int ret = 0; |
8c0faa1d | 1773 | |
3bd1e081 | 1774 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1775 | /* |
54d01ffb | 1776 | * Assign default kernel consumer socket if no consumer assigned to the |
03550b58 | 1777 | * kernel session. At this point, it's NOT supposed to be -1 but this is |
54d01ffb | 1778 | * an extra security check. |
d9800920 | 1779 | */ |
03550b58 | 1780 | if (session->consumer_fd < 0) { |
3bd1e081 | 1781 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1782 | } |
1783 | ||
f1e16794 | 1784 | ret = kernel_consumer_send_session(&kconsumer_data, session); |
f3ed775e | 1785 | if (ret < 0) { |
f3ed775e DG |
1786 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1787 | goto error; | |
1788 | } | |
1d4b027a | 1789 | |
3bd1e081 | 1790 | session->consumer_fds_sent = 1; |
f3ed775e | 1791 | } |
1d4b027a DG |
1792 | |
1793 | error: | |
1794 | return ret; | |
8c0faa1d DG |
1795 | } |
1796 | ||
0177d773 DG |
1797 | /* |
1798 | * Create an UST session and add it to the session ust list. | |
1799 | */ | |
44d3bd01 | 1800 | static int create_ust_session(struct ltt_session *session, |
6df2e2c9 | 1801 | struct lttng_domain *domain) |
0177d773 | 1802 | { |
13384287 | 1803 | struct ltt_ust_session *lus = NULL; |
6df2e2c9 | 1804 | int ret; |
44d3bd01 DG |
1805 | |
1806 | switch (domain->type) { | |
48842b30 | 1807 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1808 | break; |
1809 | default: | |
13384287 | 1810 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1811 | goto error; |
1812 | } | |
0177d773 DG |
1813 | |
1814 | DBG("Creating UST session"); | |
1815 | ||
a991f516 | 1816 | lus = trace_ust_create_session(session->path, session->id, domain); |
0177d773 | 1817 | if (lus == NULL) { |
44d3bd01 | 1818 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1819 | goto error; |
1820 | } | |
1821 | ||
e11d277b | 1822 | ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
6df2e2c9 | 1823 | session->uid, session->gid); |
0177d773 DG |
1824 | if (ret < 0) { |
1825 | if (ret != -EEXIST) { | |
1826 | ERR("Trace directory creation error"); | |
44d3bd01 | 1827 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1828 | goto error; |
1829 | } | |
1830 | } | |
1831 | ||
f6a9efaa DG |
1832 | /* The domain type dictate different actions on session creation */ |
1833 | switch (domain->type) { | |
48842b30 DG |
1834 | case LTTNG_DOMAIN_UST: |
1835 | /* No ustctl for the global UST domain */ | |
1836 | break; | |
1837 | default: | |
36dc12cc | 1838 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1839 | goto error; |
0177d773 | 1840 | } |
6df2e2c9 MD |
1841 | lus->uid = session->uid; |
1842 | lus->gid = session->gid; | |
f6a9efaa | 1843 | session->ust_session = lus; |
44d3bd01 DG |
1844 | |
1845 | return LTTCOMM_OK; | |
0177d773 DG |
1846 | |
1847 | error: | |
1848 | free(lus); | |
1849 | return ret; | |
1850 | } | |
1851 | ||
333f285e | 1852 | /* |
d063d709 | 1853 | * Create a kernel tracer session then create the default channel. |
333f285e | 1854 | */ |
6df2e2c9 | 1855 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1856 | { |
f3ed775e | 1857 | int ret; |
f3ed775e DG |
1858 | |
1859 | DBG("Creating kernel session"); | |
1860 | ||
1861 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1862 | if (ret < 0) { | |
1863 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1864 | goto error; | |
333f285e DG |
1865 | } |
1866 | ||
d9800920 | 1867 | /* Set kernel consumer socket fd */ |
03550b58 | 1868 | if (kconsumer_data.cmd_sock >= 0) { |
3bd1e081 | 1869 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1870 | } |
1871 | ||
e11d277b | 1872 | ret = run_as_mkdir_recursive(session->kernel_session->trace_path, |
6df2e2c9 | 1873 | S_IRWXU | S_IRWXG, session->uid, session->gid); |
7a485870 | 1874 | if (ret < 0) { |
996b65c8 | 1875 | if (ret != -EEXIST) { |
7a485870 DG |
1876 | ERR("Trace directory creation error"); |
1877 | goto error; | |
1878 | } | |
1879 | } | |
6df2e2c9 MD |
1880 | session->kernel_session->uid = session->uid; |
1881 | session->kernel_session->gid = session->gid; | |
7a485870 | 1882 | |
f3ed775e DG |
1883 | error: |
1884 | return ret; | |
333f285e DG |
1885 | } |
1886 | ||
8e0af1b4 | 1887 | /* |
c7704d57 DG |
1888 | * Check if the UID or GID match the session. Root user has access to all |
1889 | * sessions. | |
8e0af1b4 | 1890 | */ |
c7704d57 | 1891 | static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid) |
8e0af1b4 | 1892 | { |
c7704d57 | 1893 | if (uid != session->uid && gid != session->gid && uid != 0) { |
8e0af1b4 MD |
1894 | return 0; |
1895 | } else { | |
1896 | return 1; | |
1897 | } | |
1898 | } | |
1899 | ||
1900 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
1901 | { | |
1902 | unsigned int i = 0; | |
1903 | struct ltt_session *session; | |
1904 | ||
1905 | DBG("Counting number of available session for UID %d GID %d", | |
1906 | uid, gid); | |
1907 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1908 | /* | |
1909 | * Only list the sessions the user can control. | |
1910 | */ | |
1911 | if (!session_access_ok(session, uid, gid)) { | |
1912 | continue; | |
1913 | } | |
1914 | i++; | |
1915 | } | |
1916 | return i; | |
1917 | } | |
1918 | ||
6c9cc2ab DG |
1919 | /* |
1920 | * Using the session list, filled a lttng_session array to send back to the | |
1921 | * client for session listing. | |
1922 | * | |
1923 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1924 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab | 1925 | */ |
c7704d57 DG |
1926 | static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid, |
1927 | gid_t gid) | |
6c9cc2ab | 1928 | { |
8e0af1b4 | 1929 | unsigned int i = 0; |
6c9cc2ab DG |
1930 | struct ltt_session *session; |
1931 | ||
8e0af1b4 MD |
1932 | DBG("Getting all available session for UID %d GID %d", |
1933 | uid, gid); | |
6c9cc2ab DG |
1934 | /* |
1935 | * Iterate over session list and append data after the control struct in | |
1936 | * the buffer. | |
1937 | */ | |
1938 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
8e0af1b4 MD |
1939 | /* |
1940 | * Only list the sessions the user can control. | |
1941 | */ | |
1942 | if (!session_access_ok(session, uid, gid)) { | |
1943 | continue; | |
1944 | } | |
6c9cc2ab | 1945 | strncpy(sessions[i].path, session->path, PATH_MAX); |
99497cd0 | 1946 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1947 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1948 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 1949 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
1950 | i++; |
1951 | } | |
1952 | } | |
1953 | ||
9f19cc17 DG |
1954 | /* |
1955 | * Fill lttng_channel array of all channels. | |
1956 | */ | |
b551a063 | 1957 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1958 | struct lttng_channel *channels) |
1959 | { | |
1960 | int i = 0; | |
1961 | struct ltt_kernel_channel *kchan; | |
1962 | ||
1963 | DBG("Listing channels for session %s", session->name); | |
1964 | ||
b551a063 DG |
1965 | switch (domain) { |
1966 | case LTTNG_DOMAIN_KERNEL: | |
1967 | /* Kernel channels */ | |
1968 | if (session->kernel_session != NULL) { | |
1969 | cds_list_for_each_entry(kchan, | |
1970 | &session->kernel_session->channel_list.head, list) { | |
1971 | /* Copy lttng_channel struct to array */ | |
1972 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1973 | channels[i].enabled = kchan->enabled; | |
1974 | i++; | |
1975 | } | |
1976 | } | |
1977 | break; | |
1978 | case LTTNG_DOMAIN_UST: | |
1979 | { | |
bec39940 | 1980 | struct lttng_ht_iter iter; |
b551a063 DG |
1981 | struct ltt_ust_channel *uchan; |
1982 | ||
bec39940 DG |
1983 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht, |
1984 | &iter.iter, uchan, node.node) { | |
b551a063 DG |
1985 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
1986 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
1987 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
1988 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
1989 | channels[i].attr.switch_timer_interval = | |
1990 | uchan->attr.switch_timer_interval; | |
1991 | channels[i].attr.read_timer_interval = | |
1992 | uchan->attr.read_timer_interval; | |
aea829b3 | 1993 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
1994 | switch (uchan->attr.output) { |
1995 | case LTTNG_UST_MMAP: | |
1996 | default: | |
1997 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
1998 | break; | |
1999 | } | |
befe0905 | 2000 | i++; |
b551a063 DG |
2001 | } |
2002 | break; | |
2003 | } | |
2004 | default: | |
2005 | break; | |
2006 | } | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * Create a list of ust global domain events. | |
2011 | */ | |
2012 | static int list_lttng_ust_global_events(char *channel_name, | |
2013 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2014 | { | |
2015 | int i = 0, ret = 0; | |
2016 | unsigned int nb_event = 0; | |
bec39940 DG |
2017 | struct lttng_ht_iter iter; |
2018 | struct lttng_ht_node_str *node; | |
b551a063 DG |
2019 | struct ltt_ust_channel *uchan; |
2020 | struct ltt_ust_event *uevent; | |
2021 | struct lttng_event *tmp; | |
2022 | ||
2023 | DBG("Listing UST global events for channel %s", channel_name); | |
2024 | ||
2025 | rcu_read_lock(); | |
2026 | ||
bec39940 DG |
2027 | lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter); |
2028 | node = lttng_ht_iter_get_node_str(&iter); | |
d7b75b30 DG |
2029 | if (node == NULL) { |
2030 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2031 | goto error; | |
b551a063 DG |
2032 | } |
2033 | ||
bec39940 | 2034 | uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node); |
d7b75b30 | 2035 | |
bec39940 | 2036 | nb_event += lttng_ht_get_count(uchan->events); |
d7b75b30 | 2037 | |
b551a063 DG |
2038 | if (nb_event == 0) { |
2039 | ret = nb_event; | |
2040 | goto error; | |
2041 | } | |
2042 | ||
2043 | DBG3("Listing UST global %d events", nb_event); | |
2044 | ||
2045 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2046 | if (tmp == NULL) { | |
2047 | ret = -LTTCOMM_FATAL; | |
2048 | goto error; | |
2049 | } | |
2050 | ||
bec39940 | 2051 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
d7b75b30 DG |
2052 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
2053 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2054 | tmp[i].enabled = uevent->enabled; | |
2055 | switch (uevent->attr.instrumentation) { | |
2056 | case LTTNG_UST_TRACEPOINT: | |
2057 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2058 | break; | |
2059 | case LTTNG_UST_PROBE: | |
2060 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2061 | break; | |
2062 | case LTTNG_UST_FUNCTION: | |
2063 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2064 | break; | |
0cda4f28 | 2065 | } |
8005f29a | 2066 | tmp[i].loglevel = uevent->attr.loglevel; |
0cda4f28 | 2067 | switch (uevent->attr.loglevel_type) { |
8005f29a | 2068 | case LTTNG_UST_LOGLEVEL_ALL: |
22e25b71 | 2069 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; |
0cda4f28 | 2070 | break; |
8005f29a | 2071 | case LTTNG_UST_LOGLEVEL_RANGE: |
22e25b71 | 2072 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; |
8005f29a MD |
2073 | break; |
2074 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
22e25b71 | 2075 | tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
ac3bd9c0 | 2076 | break; |
9f19cc17 | 2077 | } |
d7b75b30 | 2078 | i++; |
9f19cc17 DG |
2079 | } |
2080 | ||
b551a063 DG |
2081 | ret = nb_event; |
2082 | *events = tmp; | |
2083 | ||
2084 | error: | |
2085 | rcu_read_unlock(); | |
2086 | return ret; | |
9f19cc17 DG |
2087 | } |
2088 | ||
2089 | /* | |
b551a063 | 2090 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2091 | */ |
b551a063 DG |
2092 | static int list_lttng_kernel_events(char *channel_name, |
2093 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2094 | { |
b551a063 DG |
2095 | int i = 0, ret; |
2096 | unsigned int nb_event; | |
9f19cc17 | 2097 | struct ltt_kernel_event *event; |
b551a063 DG |
2098 | struct ltt_kernel_channel *kchan; |
2099 | ||
2100 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2101 | if (kchan == NULL) { | |
2102 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2103 | goto error; | |
2104 | } | |
2105 | ||
2106 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2107 | |
2108 | DBG("Listing events for channel %s", kchan->channel->name); | |
2109 | ||
b551a063 DG |
2110 | if (nb_event == 0) { |
2111 | ret = nb_event; | |
2112 | goto error; | |
2113 | } | |
2114 | ||
2115 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2116 | if (*events == NULL) { | |
2117 | ret = LTTCOMM_FATAL; | |
2118 | goto error; | |
2119 | } | |
2120 | ||
9f19cc17 DG |
2121 | /* Kernel channels */ |
2122 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2123 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2124 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2125 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2126 | switch (event->event->instrumentation) { |
2127 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2128 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2129 | break; |
2130 | case LTTNG_KERNEL_KPROBE: | |
2131 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2132 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2133 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2134 | sizeof(struct lttng_kernel_kprobe)); |
2135 | break; | |
2136 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2137 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2138 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2139 | sizeof(struct lttng_kernel_function)); |
2140 | break; | |
0133c199 | 2141 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2142 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2143 | break; |
a54bd42d | 2144 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2145 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2146 | break; |
7a3d1328 MD |
2147 | case LTTNG_KERNEL_ALL: |
2148 | assert(0); | |
2149 | break; | |
9f19cc17 DG |
2150 | } |
2151 | i++; | |
2152 | } | |
b551a063 DG |
2153 | |
2154 | return nb_event; | |
2155 | ||
2156 | error: | |
2157 | return ret; | |
9f19cc17 DG |
2158 | } |
2159 | ||
fac6795d | 2160 | /* |
54d01ffb | 2161 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2162 | */ |
54d01ffb DG |
2163 | static int cmd_disable_channel(struct ltt_session *session, |
2164 | int domain, char *channel_name) | |
fac6795d | 2165 | { |
54d01ffb | 2166 | int ret; |
78f0bacd DG |
2167 | struct ltt_ust_session *usess; |
2168 | ||
2169 | usess = session->ust_session; | |
379473d2 | 2170 | |
54d01ffb | 2171 | switch (domain) { |
78f0bacd DG |
2172 | case LTTNG_DOMAIN_KERNEL: |
2173 | { | |
2174 | ret = channel_kernel_disable(session->kernel_session, | |
2175 | channel_name); | |
2176 | if (ret != LTTCOMM_OK) { | |
2177 | goto error; | |
2178 | } | |
54d01ffb | 2179 | |
78f0bacd DG |
2180 | kernel_wait_quiescent(kernel_tracer_fd); |
2181 | break; | |
2182 | } | |
2183 | case LTTNG_DOMAIN_UST: | |
2184 | { | |
2185 | struct ltt_ust_channel *uchan; | |
bec39940 | 2186 | struct lttng_ht *chan_ht; |
78f0bacd | 2187 | |
7885e399 DG |
2188 | chan_ht = usess->domain_global.channels; |
2189 | ||
2190 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2191 | if (uchan == NULL) { |
2192 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2193 | goto error; |
78f0bacd DG |
2194 | } |
2195 | ||
7885e399 DG |
2196 | ret = channel_ust_disable(usess, domain, uchan); |
2197 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2198 | goto error; |
2199 | } | |
78f0bacd DG |
2200 | break; |
2201 | } | |
d78d6610 | 2202 | #if 0 |
78f0bacd DG |
2203 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2204 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2205 | case LTTNG_DOMAIN_UST_PID: | |
d78d6610 | 2206 | #endif |
78f0bacd DG |
2207 | default: |
2208 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2209 | goto error; | |
20fe2104 DG |
2210 | } |
2211 | ||
54d01ffb | 2212 | ret = LTTCOMM_OK; |
d65106b1 | 2213 | |
54d01ffb DG |
2214 | error: |
2215 | return ret; | |
2216 | } | |
2217 | ||
2218 | /* | |
2219 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2220 | */ | |
44d3bd01 | 2221 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2222 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2223 | { |
2224 | int ret; | |
f6a9efaa | 2225 | struct ltt_ust_session *usess = session->ust_session; |
bec39940 | 2226 | struct lttng_ht *chan_ht; |
f6a9efaa | 2227 | |
5d56b5aa | 2228 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2229 | |
aea829b3 | 2230 | switch (domain) { |
44d3bd01 DG |
2231 | case LTTNG_DOMAIN_KERNEL: |
2232 | { | |
2233 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2234 | |
44d3bd01 DG |
2235 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2236 | session->kernel_session); | |
2237 | if (kchan == NULL) { | |
2238 | ret = channel_kernel_create(session->kernel_session, | |
2239 | attr, kernel_poll_pipe[1]); | |
2240 | } else { | |
2241 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2242 | } | |
2243 | ||
2244 | if (ret != LTTCOMM_OK) { | |
2245 | goto error; | |
2246 | } | |
2247 | ||
2248 | kernel_wait_quiescent(kernel_tracer_fd); | |
2249 | break; | |
2250 | } | |
f6a9efaa DG |
2251 | case LTTNG_DOMAIN_UST: |
2252 | { | |
2253 | struct ltt_ust_channel *uchan; | |
2254 | ||
7885e399 | 2255 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2256 | |
7885e399 | 2257 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2258 | if (uchan == NULL) { |
7885e399 | 2259 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2260 | } else { |
7885e399 | 2261 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2262 | } |
f6a9efaa DG |
2263 | break; |
2264 | } | |
d78d6610 | 2265 | #if 0 |
78f0bacd DG |
2266 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2267 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2268 | case LTTNG_DOMAIN_UST_PID: |
d78d6610 | 2269 | #endif |
44d3bd01 DG |
2270 | default: |
2271 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2272 | goto error; | |
54d01ffb DG |
2273 | } |
2274 | ||
54d01ffb DG |
2275 | error: |
2276 | return ret; | |
2277 | } | |
2278 | ||
2279 | /* | |
2280 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2281 | */ | |
2282 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2283 | char *channel_name, char *event_name) | |
2284 | { | |
2285 | int ret; | |
54d01ffb DG |
2286 | |
2287 | switch (domain) { | |
2288 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2289 | { |
2290 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2291 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2292 | |
b0a40d28 DG |
2293 | ksess = session->kernel_session; |
2294 | ||
2295 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2296 | if (kchan == NULL) { |
2297 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2298 | goto error; | |
d65106b1 DG |
2299 | } |
2300 | ||
b0a40d28 | 2301 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2302 | if (ret != LTTCOMM_OK) { |
2303 | goto error; | |
2304 | } | |
2305 | ||
2306 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2307 | break; |
2bdd86d4 MD |
2308 | } |
2309 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2310 | { |
b0a40d28 | 2311 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2312 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2313 | |
2314 | usess = session->ust_session; | |
2315 | ||
2316 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2317 | channel_name); | |
2318 | if (uchan == NULL) { | |
2319 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2320 | goto error; | |
2321 | } | |
2322 | ||
7f79d3a1 DG |
2323 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2324 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2325 | goto error; |
2326 | } | |
2327 | ||
7f79d3a1 | 2328 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2329 | channel_name); |
b0a40d28 DG |
2330 | break; |
2331 | } | |
d78d6610 | 2332 | #if 0 |
2bdd86d4 MD |
2333 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2334 | case LTTNG_DOMAIN_UST_PID: | |
2335 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2336 | #endif |
54d01ffb | 2337 | default: |
1ab1ea0b | 2338 | ret = LTTCOMM_UND; |
54d01ffb | 2339 | goto error; |
d65106b1 | 2340 | } |
26cc6b4e | 2341 | |
54d01ffb DG |
2342 | ret = LTTCOMM_OK; |
2343 | ||
2344 | error: | |
2345 | return ret; | |
2346 | } | |
2347 | ||
2348 | /* | |
2349 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2350 | */ | |
2351 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2352 | char *channel_name) | |
2353 | { | |
2354 | int ret; | |
54d01ffb DG |
2355 | |
2356 | switch (domain) { | |
2357 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2358 | { |
2359 | struct ltt_kernel_session *ksess; | |
2360 | struct ltt_kernel_channel *kchan; | |
2361 | ||
2362 | ksess = session->kernel_session; | |
2363 | ||
2364 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2365 | if (kchan == NULL) { |
2366 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2367 | goto error; | |
26cc6b4e DG |
2368 | } |
2369 | ||
9730260e | 2370 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2371 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2372 | goto error; |
26cc6b4e DG |
2373 | } |
2374 | ||
54d01ffb | 2375 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2376 | break; |
9730260e DG |
2377 | } |
2378 | case LTTNG_DOMAIN_UST: | |
2379 | { | |
2380 | struct ltt_ust_session *usess; | |
2381 | struct ltt_ust_channel *uchan; | |
2382 | ||
2383 | usess = session->ust_session; | |
2384 | ||
2385 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2386 | channel_name); | |
2387 | if (uchan == NULL) { | |
2388 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2389 | goto error; | |
2390 | } | |
2391 | ||
7f79d3a1 DG |
2392 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2393 | if (ret != 0) { | |
9730260e DG |
2394 | goto error; |
2395 | } | |
2396 | ||
7f79d3a1 | 2397 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2398 | |
2399 | break; | |
2400 | } | |
d78d6610 | 2401 | #if 0 |
9730260e DG |
2402 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2403 | case LTTNG_DOMAIN_UST_PID: | |
2404 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2405 | #endif |
54d01ffb | 2406 | default: |
1ab1ea0b | 2407 | ret = LTTCOMM_UND; |
54d01ffb | 2408 | goto error; |
26cc6b4e | 2409 | } |
e953ef25 | 2410 | |
54d01ffb | 2411 | ret = LTTCOMM_OK; |
e953ef25 | 2412 | |
54d01ffb DG |
2413 | error: |
2414 | return ret; | |
2415 | } | |
f5177a38 | 2416 | |
54d01ffb DG |
2417 | /* |
2418 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2419 | */ | |
2420 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2421 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2422 | { | |
2423 | int ret; | |
f5177a38 | 2424 | |
54d01ffb DG |
2425 | switch (domain) { |
2426 | case LTTNG_DOMAIN_KERNEL: | |
2427 | /* Add kernel context to kernel tracer */ | |
2428 | ret = context_kernel_add(session->kernel_session, ctx, | |
2429 | event_name, channel_name); | |
2430 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2431 | goto error; |
e953ef25 | 2432 | } |
2bdd86d4 MD |
2433 | break; |
2434 | case LTTNG_DOMAIN_UST: | |
2435 | { | |
55cc08a6 | 2436 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2437 | |
55cc08a6 DG |
2438 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2439 | if (ret != LTTCOMM_OK) { | |
2440 | goto error; | |
2bdd86d4 | 2441 | } |
e953ef25 | 2442 | break; |
2bdd86d4 | 2443 | } |
d78d6610 | 2444 | #if 0 |
55cc08a6 DG |
2445 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2446 | case LTTNG_DOMAIN_UST_PID: | |
2447 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2448 | #endif |
54d01ffb | 2449 | default: |
1ab1ea0b | 2450 | ret = LTTCOMM_UND; |
54d01ffb | 2451 | goto error; |
e953ef25 | 2452 | } |
950131af | 2453 | |
54d01ffb | 2454 | ret = LTTCOMM_OK; |
950131af | 2455 | |
54d01ffb DG |
2456 | error: |
2457 | return ret; | |
2458 | } | |
2459 | ||
2460 | /* | |
2461 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2462 | */ | |
2463 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2464 | char *channel_name, struct lttng_event *event) | |
2465 | { | |
2466 | int ret; | |
f6cd6b0f | 2467 | struct lttng_channel *attr; |
48842b30 | 2468 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2469 | |
2470 | switch (domain) { | |
2471 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2472 | { |
2473 | struct ltt_kernel_channel *kchan; | |
2474 | ||
54d01ffb DG |
2475 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2476 | session->kernel_session); | |
2477 | if (kchan == NULL) { | |
f6cd6b0f DG |
2478 | attr = channel_new_default_attr(domain); |
2479 | if (attr == NULL) { | |
2480 | ret = LTTCOMM_FATAL; | |
2481 | goto error; | |
2482 | } | |
2483 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2484 | ||
54d01ffb | 2485 | /* This call will notify the kernel thread */ |
44d3bd01 | 2486 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2487 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2488 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2489 | free(attr); |
f5177a38 DG |
2490 | goto error; |
2491 | } | |
ff4d74e6 | 2492 | free(attr); |
54d01ffb | 2493 | } |
950131af | 2494 | |
54d01ffb DG |
2495 | /* Get the newly created kernel channel pointer */ |
2496 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2497 | session->kernel_session); | |
2498 | if (kchan == NULL) { | |
2499 | /* This sould not happen... */ | |
2500 | ret = LTTCOMM_FATAL; | |
2501 | goto error; | |
2502 | } | |
f5177a38 | 2503 | |
48842b30 DG |
2504 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2505 | event); | |
54d01ffb | 2506 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2507 | goto error; |
950131af DG |
2508 | } |
2509 | ||
54d01ffb | 2510 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2511 | break; |
2bdd86d4 MD |
2512 | } |
2513 | case LTTNG_DOMAIN_UST: | |
2514 | { | |
aea829b3 | 2515 | struct lttng_channel *attr; |
edb67388 | 2516 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2517 | |
edb67388 | 2518 | /* Get channel from global UST domain */ |
48842b30 DG |
2519 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2520 | channel_name); | |
2521 | if (uchan == NULL) { | |
aea829b3 DG |
2522 | /* Create default channel */ |
2523 | attr = channel_new_default_attr(domain); | |
2524 | if (attr == NULL) { | |
2525 | ret = LTTCOMM_FATAL; | |
2526 | goto error; | |
2527 | } | |
596219f7 | 2528 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2529 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2530 | |
7885e399 | 2531 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2532 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2533 | free(attr); |
aea829b3 DG |
2534 | goto error; |
2535 | } | |
aea829b3 DG |
2536 | free(attr); |
2537 | ||
2538 | /* Get the newly created channel reference back */ | |
2539 | uchan = trace_ust_find_channel_by_name( | |
2540 | usess->domain_global.channels, channel_name); | |
2541 | if (uchan == NULL) { | |
2542 | /* Something is really wrong */ | |
2543 | ret = LTTCOMM_FATAL; | |
2544 | goto error; | |
2545 | } | |
48842b30 | 2546 | } |
2bdd86d4 | 2547 | |
edb67388 | 2548 | /* At this point, the session and channel exist on the tracer */ |
edb67388 DG |
2549 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2550 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2551 | goto error; |
2bdd86d4 MD |
2552 | } |
2553 | break; | |
2554 | } | |
d78d6610 | 2555 | #if 0 |
2bdd86d4 MD |
2556 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2557 | case LTTNG_DOMAIN_UST_PID: | |
2558 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2559 | #endif |
54d01ffb | 2560 | default: |
1ab1ea0b | 2561 | ret = LTTCOMM_UND; |
54d01ffb | 2562 | goto error; |
950131af | 2563 | } |
d36b8583 | 2564 | |
54d01ffb | 2565 | ret = LTTCOMM_OK; |
d36b8583 | 2566 | |
54d01ffb DG |
2567 | error: |
2568 | return ret; | |
2569 | } | |
7d29a247 | 2570 | |
54d01ffb DG |
2571 | /* |
2572 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2573 | */ | |
2574 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2575 | char *channel_name, int event_type) |
54d01ffb DG |
2576 | { |
2577 | int ret; | |
2578 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2579 | |
54d01ffb DG |
2580 | switch (domain) { |
2581 | case LTTNG_DOMAIN_KERNEL: | |
2582 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2583 | session->kernel_session); | |
2584 | if (kchan == NULL) { | |
2585 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2586 | ret = channel_kernel_create(session->kernel_session, NULL, |
2587 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2588 | if (ret != LTTCOMM_OK) { |
2589 | goto error; | |
d36b8583 | 2590 | } |
0d0c377a | 2591 | |
8f69e5eb DG |
2592 | /* Get the newly created kernel channel pointer */ |
2593 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2594 | session->kernel_session); | |
2595 | if (kchan == NULL) { | |
2596 | /* This sould not happen... */ | |
2597 | ret = LTTCOMM_FATAL; | |
2598 | goto error; | |
2599 | } | |
2600 | ||
54d01ffb | 2601 | } |
0fdd1e2c | 2602 | |
7a3d1328 | 2603 | switch (event_type) { |
76d45b40 | 2604 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2605 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2606 | kchan, kernel_tracer_fd); |
7a3d1328 | 2607 | break; |
76d45b40 | 2608 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2609 | /* |
7a3d1328 MD |
2610 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2611 | * events already registered to the channel. | |
8c9ae521 | 2612 | */ |
7a3d1328 MD |
2613 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2614 | kchan, kernel_tracer_fd); | |
2615 | break; | |
76d45b40 | 2616 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2617 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2618 | ret = event_kernel_enable_all(session->kernel_session, |
2619 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2620 | break; |
2621 | default: | |
2622 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2623 | goto error; | |
8c9ae521 | 2624 | } |
8f69e5eb DG |
2625 | |
2626 | /* Manage return value */ | |
54d01ffb | 2627 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2628 | goto error; |
d36b8583 DG |
2629 | } |
2630 | ||
54d01ffb | 2631 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2632 | break; |
76d45b40 DG |
2633 | case LTTNG_DOMAIN_UST: |
2634 | { | |
2635 | struct lttng_channel *attr; | |
2636 | struct ltt_ust_channel *uchan; | |
2637 | struct ltt_ust_session *usess = session->ust_session; | |
2638 | ||
2639 | /* Get channel from global UST domain */ | |
2640 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2641 | channel_name); | |
2642 | if (uchan == NULL) { | |
2643 | /* Create default channel */ | |
2644 | attr = channel_new_default_attr(domain); | |
2645 | if (attr == NULL) { | |
2646 | ret = LTTCOMM_FATAL; | |
2647 | goto error; | |
2648 | } | |
2649 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2650 | attr->name[NAME_MAX - 1] = '\0'; | |
2651 | ||
2652 | /* Use the internal command enable channel */ | |
7885e399 | 2653 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2654 | if (ret != LTTCOMM_OK) { |
2655 | free(attr); | |
2656 | goto error; | |
2657 | } | |
2658 | free(attr); | |
2659 | ||
2660 | /* Get the newly created channel reference back */ | |
2661 | uchan = trace_ust_find_channel_by_name( | |
2662 | usess->domain_global.channels, channel_name); | |
2663 | if (uchan == NULL) { | |
2664 | /* Something is really wrong */ | |
2665 | ret = LTTCOMM_FATAL; | |
2666 | goto error; | |
2667 | } | |
2668 | } | |
2669 | ||
2670 | /* At this point, the session and channel exist on the tracer */ | |
2671 | ||
2672 | switch (event_type) { | |
2673 | case LTTNG_EVENT_ALL: | |
2674 | case LTTNG_EVENT_TRACEPOINT: | |
2675 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2676 | if (ret != LTTCOMM_OK) { | |
2677 | goto error; | |
2678 | } | |
2679 | break; | |
2680 | default: | |
2681 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2682 | goto error; | |
2683 | } | |
2684 | ||
2685 | /* Manage return value */ | |
2686 | if (ret != LTTCOMM_OK) { | |
2687 | goto error; | |
2688 | } | |
2689 | ||
2690 | break; | |
2691 | } | |
d78d6610 | 2692 | #if 0 |
76d45b40 DG |
2693 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2694 | case LTTNG_DOMAIN_UST_PID: | |
2695 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
d78d6610 | 2696 | #endif |
54d01ffb | 2697 | default: |
1ab1ea0b | 2698 | ret = LTTCOMM_UND; |
54d01ffb | 2699 | goto error; |
d36b8583 | 2700 | } |
f3ed775e | 2701 | |
54d01ffb DG |
2702 | ret = LTTCOMM_OK; |
2703 | ||
2704 | error: | |
2705 | return ret; | |
2706 | } | |
2707 | ||
2708 | /* | |
2709 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2710 | */ | |
2711 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2712 | { | |
2713 | int ret; | |
2714 | ssize_t nb_events = 0; | |
2715 | ||
2716 | switch (domain) { | |
2717 | case LTTNG_DOMAIN_KERNEL: | |
2718 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2719 | if (nb_events < 0) { | |
2720 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2721 | goto error; | |
894be886 | 2722 | } |
54d01ffb | 2723 | break; |
b551a063 DG |
2724 | case LTTNG_DOMAIN_UST: |
2725 | nb_events = ust_app_list_events(events); | |
2726 | if (nb_events < 0) { | |
2727 | ret = LTTCOMM_UST_LIST_FAIL; | |
2728 | goto error; | |
2729 | } | |
2730 | break; | |
54d01ffb | 2731 | default: |
1ab1ea0b | 2732 | ret = LTTCOMM_UND; |
54d01ffb DG |
2733 | goto error; |
2734 | } | |
894be886 | 2735 | |
54d01ffb | 2736 | return nb_events; |
7d29a247 | 2737 | |
54d01ffb DG |
2738 | error: |
2739 | /* Return negative value to differentiate return code */ | |
2740 | return -ret; | |
2741 | } | |
b389abbe | 2742 | |
f37d259d MD |
2743 | /* |
2744 | * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread. | |
2745 | */ | |
2746 | static ssize_t cmd_list_tracepoint_fields(int domain, | |
2747 | struct lttng_event_field **fields) | |
2748 | { | |
2749 | int ret; | |
2750 | ssize_t nb_fields = 0; | |
2751 | ||
2752 | switch (domain) { | |
2753 | case LTTNG_DOMAIN_UST: | |
2754 | nb_fields = ust_app_list_event_fields(fields); | |
2755 | if (nb_fields < 0) { | |
2756 | ret = LTTCOMM_UST_LIST_FAIL; | |
2757 | goto error; | |
2758 | } | |
2759 | break; | |
2760 | case LTTNG_DOMAIN_KERNEL: | |
2761 | default: /* fall-through */ | |
2762 | ret = LTTCOMM_UND; | |
2763 | goto error; | |
2764 | } | |
2765 | ||
2766 | return nb_fields; | |
2767 | ||
2768 | error: | |
2769 | /* Return negative value to differentiate return code */ | |
2770 | return -ret; | |
2771 | } | |
2772 | ||
54d01ffb DG |
2773 | /* |
2774 | * Command LTTNG_START_TRACE processed by the client thread. | |
2775 | */ | |
2776 | static int cmd_start_trace(struct ltt_session *session) | |
2777 | { | |
2778 | int ret; | |
54d01ffb | 2779 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2780 | struct ltt_ust_session *usess; |
b389abbe | 2781 | |
54d01ffb DG |
2782 | /* Short cut */ |
2783 | ksession = session->kernel_session; | |
b9d9b220 | 2784 | usess = session->ust_session; |
5eb91c98 | 2785 | |
b9ef1c83 | 2786 | if (session->enabled) { |
80e327fa DG |
2787 | /* Already started. */ |
2788 | ret = LTTCOMM_TRACE_ALREADY_STARTED; | |
b9ef1c83 DG |
2789 | goto error; |
2790 | } | |
2791 | ||
464dd62d MD |
2792 | session->enabled = 1; |
2793 | ||
54d01ffb DG |
2794 | /* Kernel tracing */ |
2795 | if (ksession != NULL) { | |
2bdd86d4 MD |
2796 | struct ltt_kernel_channel *kchan; |
2797 | ||
54d01ffb DG |
2798 | /* Open kernel metadata */ |
2799 | if (ksession->metadata == NULL) { | |
2800 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2801 | if (ret < 0) { | |
2802 | ret = LTTCOMM_KERN_META_FAIL; | |
2803 | goto error; | |
b389abbe | 2804 | } |
54d01ffb | 2805 | } |
7d29a247 | 2806 | |
54d01ffb | 2807 | /* Open kernel metadata stream */ |
03550b58 | 2808 | if (ksession->metadata_stream_fd < 0) { |
54d01ffb DG |
2809 | ret = kernel_open_metadata_stream(ksession); |
2810 | if (ret < 0) { | |
2811 | ERR("Kernel create metadata stream failed"); | |
2812 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2813 | goto error; | |
2814 | } | |
2815 | } | |
2816 | ||
2817 | /* For each channel */ | |
2818 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2819 | if (kchan->stream_count == 0) { | |
2820 | ret = kernel_open_channel_stream(kchan); | |
2821 | if (ret < 0) { | |
2822 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2823 | goto error; |
2824 | } | |
54d01ffb DG |
2825 | /* Update the stream global counter */ |
2826 | ksession->stream_count_global += ret; | |
7d29a247 | 2827 | } |
54d01ffb DG |
2828 | } |
2829 | ||
2830 | /* Setup kernel consumer socket and send fds to it */ | |
2831 | ret = init_kernel_tracing(ksession); | |
2832 | if (ret < 0) { | |
2833 | ret = LTTCOMM_KERN_START_FAIL; | |
2834 | goto error; | |
2835 | } | |
2836 | ||
2837 | /* This start the kernel tracing */ | |
2838 | ret = kernel_start_session(ksession); | |
2839 | if (ret < 0) { | |
2840 | ret = LTTCOMM_KERN_START_FAIL; | |
2841 | goto error; | |
2842 | } | |
2843 | ||
2844 | /* Quiescent wait after starting trace */ | |
2845 | kernel_wait_quiescent(kernel_tracer_fd); | |
2846 | } | |
2847 | ||
36dc12cc | 2848 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2849 | if (usess) { |
2850 | usess->start_trace = 1; | |
36dc12cc | 2851 | |
b9d9b220 DG |
2852 | ret = ust_app_start_trace_all(usess); |
2853 | if (ret < 0) { | |
2854 | ret = LTTCOMM_UST_START_FAIL; | |
2855 | goto error; | |
2856 | } | |
2bdd86d4 | 2857 | } |
54d01ffb DG |
2858 | |
2859 | ret = LTTCOMM_OK; | |
2860 | ||
2861 | error: | |
2862 | return ret; | |
2863 | } | |
2864 | ||
2865 | /* | |
2866 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2867 | */ | |
2868 | static int cmd_stop_trace(struct ltt_session *session) | |
2869 | { | |
2870 | int ret; | |
2871 | struct ltt_kernel_channel *kchan; | |
2872 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2873 | struct ltt_ust_session *usess; |
54d01ffb DG |
2874 | |
2875 | /* Short cut */ | |
2876 | ksession = session->kernel_session; | |
8be98f9a | 2877 | usess = session->ust_session; |
54d01ffb | 2878 | |
b9ef1c83 | 2879 | if (!session->enabled) { |
80e327fa | 2880 | ret = LTTCOMM_TRACE_ALREADY_STOPPED; |
b9ef1c83 DG |
2881 | goto error; |
2882 | } | |
2883 | ||
464dd62d MD |
2884 | session->enabled = 0; |
2885 | ||
54d01ffb DG |
2886 | /* Kernel tracer */ |
2887 | if (ksession != NULL) { | |
2888 | DBG("Stop kernel tracing"); | |
2889 | ||
2890 | /* Flush all buffers before stopping */ | |
2891 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2892 | if (ret < 0) { | |
2893 | ERR("Kernel metadata flush failed"); | |
2894 | } | |
f34daff7 | 2895 | |
54d01ffb DG |
2896 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2897 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2898 | if (ret < 0) { |
54d01ffb | 2899 | ERR("Kernel flush buffer error"); |
7d29a247 | 2900 | } |
54d01ffb | 2901 | } |
19e70852 | 2902 | |
54d01ffb DG |
2903 | ret = kernel_stop_session(ksession); |
2904 | if (ret < 0) { | |
2905 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2906 | goto error; |
f3ed775e | 2907 | } |
54d01ffb DG |
2908 | |
2909 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2910 | } |
54d01ffb | 2911 | |
8be98f9a MD |
2912 | if (usess) { |
2913 | usess->start_trace = 0; | |
2bdd86d4 | 2914 | |
8be98f9a | 2915 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2916 | if (ret < 0) { |
190df5ac | 2917 | ret = LTTCOMM_UST_STOP_FAIL; |
2bdd86d4 MD |
2918 | goto error; |
2919 | } | |
2bdd86d4 | 2920 | } |
54d01ffb DG |
2921 | |
2922 | ret = LTTCOMM_OK; | |
2923 | ||
2924 | error: | |
2925 | return ret; | |
2926 | } | |
2927 | ||
2928 | /* | |
2929 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2930 | */ | |
730389d9 | 2931 | static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds) |
54d01ffb DG |
2932 | { |
2933 | int ret; | |
2934 | ||
730389d9 DG |
2935 | ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds), |
2936 | LTTNG_SOCK_GET_GID_CRED(creds)); | |
54d01ffb DG |
2937 | if (ret != LTTCOMM_OK) { |
2938 | goto error; | |
2939 | } | |
2940 | ||
2941 | ret = LTTCOMM_OK; | |
2942 | ||
2943 | error: | |
2944 | return ret; | |
2945 | } | |
2946 | ||
2947 | /* | |
2948 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2949 | */ | |
2950 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2951 | { | |
2952 | int ret; | |
2953 | ||
2954 | /* Clean kernel session teardown */ | |
2955 | teardown_kernel_session(session); | |
84cd17c6 MD |
2956 | /* UST session teardown */ |
2957 | teardown_ust_session(session); | |
54d01ffb DG |
2958 | |
2959 | /* | |
2960 | * Must notify the kernel thread here to update it's poll setin order | |
2961 | * to remove the channel(s)' fd just destroyed. | |
2962 | */ | |
2963 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2964 | if (ret < 0) { | |
76d7553f | 2965 | PERROR("write kernel poll pipe"); |
54d01ffb DG |
2966 | } |
2967 | ||
271933a4 | 2968 | ret = session_destroy(session); |
54d01ffb DG |
2969 | |
2970 | return ret; | |
2971 | } | |
2972 | ||
2973 | /* | |
2974 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2975 | */ | |
2976 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2977 | { | |
2978 | int ret; | |
2979 | ||
2980 | switch (domain) { | |
2981 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2982 | { |
54d01ffb | 2983 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2984 | |
54d01ffb DG |
2985 | kcalibrate.type = calibrate->type; |
2986 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2987 | if (ret < 0) { |
54d01ffb DG |
2988 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2989 | goto error; | |
33a2b854 | 2990 | } |
54d01ffb DG |
2991 | break; |
2992 | } | |
4466912f DG |
2993 | case LTTNG_DOMAIN_UST: |
2994 | { | |
2995 | struct lttng_ust_calibrate ucalibrate; | |
2996 | ||
2997 | ucalibrate.type = calibrate->type; | |
2998 | ret = ust_app_calibrate_glb(&ucalibrate); | |
2999 | if (ret < 0) { | |
3000 | ret = LTTCOMM_UST_CALIBRATE_FAIL; | |
3001 | goto error; | |
3002 | } | |
3003 | break; | |
3004 | } | |
54d01ffb | 3005 | default: |
1ab1ea0b | 3006 | ret = LTTCOMM_UND; |
54d01ffb DG |
3007 | goto error; |
3008 | } | |
33a2b854 | 3009 | |
54d01ffb | 3010 | ret = LTTCOMM_OK; |
33a2b854 | 3011 | |
54d01ffb DG |
3012 | error: |
3013 | return ret; | |
3014 | } | |
7d29a247 | 3015 | |
54d01ffb DG |
3016 | /* |
3017 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3018 | */ | |
3019 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3020 | char *sock_path) | |
3021 | { | |
3022 | int ret, sock; | |
b389abbe | 3023 | |
54d01ffb DG |
3024 | switch (domain) { |
3025 | case LTTNG_DOMAIN_KERNEL: | |
3026 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3027 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3028 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3029 | goto error; | |
3030 | } | |
3031 | ||
3032 | sock = lttcomm_connect_unix_sock(sock_path); | |
3033 | if (sock < 0) { | |
3034 | ret = LTTCOMM_CONNECT_FAIL; | |
3035 | goto error; | |
3036 | } | |
3037 | ||
3038 | session->kernel_session->consumer_fd = sock; | |
3039 | break; | |
3040 | default: | |
3041 | /* TODO: Userspace tracing */ | |
1ab1ea0b | 3042 | ret = LTTCOMM_UND; |
54d01ffb DG |
3043 | goto error; |
3044 | } | |
3045 | ||
3046 | ret = LTTCOMM_OK; | |
3047 | ||
3048 | error: | |
3049 | return ret; | |
3050 | } | |
3051 | ||
3052 | /* | |
3053 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3054 | */ | |
3055 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3056 | struct lttng_domain **domains) | |
3057 | { | |
b551a063 | 3058 | int ret, index = 0; |
54d01ffb DG |
3059 | ssize_t nb_dom = 0; |
3060 | ||
3061 | if (session->kernel_session != NULL) { | |
b551a063 | 3062 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3063 | nb_dom++; |
3064 | } | |
3065 | ||
b551a063 DG |
3066 | if (session->ust_session != NULL) { |
3067 | DBG3("Listing domains found UST global domain"); | |
3068 | nb_dom++; | |
3069 | } | |
54d01ffb | 3070 | |
b551a063 | 3071 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3072 | if (*domains == NULL) { |
3073 | ret = -LTTCOMM_FATAL; | |
3074 | goto error; | |
3075 | } | |
3076 | ||
b551a063 DG |
3077 | if (session->kernel_session != NULL) { |
3078 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3079 | index++; | |
3080 | } | |
3081 | ||
3082 | if (session->ust_session != NULL) { | |
3083 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3084 | index++; | |
3085 | } | |
54d01ffb | 3086 | |
54d01ffb DG |
3087 | return nb_dom; |
3088 | ||
3089 | error: | |
3090 | return ret; | |
3091 | } | |
3092 | ||
3093 | /* | |
3094 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3095 | */ | |
b551a063 | 3096 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3097 | struct lttng_channel **channels) |
3098 | { | |
3099 | int ret; | |
3100 | ssize_t nb_chan = 0; | |
3101 | ||
b551a063 DG |
3102 | switch (domain) { |
3103 | case LTTNG_DOMAIN_KERNEL: | |
3104 | if (session->kernel_session != NULL) { | |
3105 | nb_chan = session->kernel_session->channel_count; | |
3106 | } | |
0df502fd | 3107 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3108 | break; |
3109 | case LTTNG_DOMAIN_UST: | |
3110 | if (session->ust_session != NULL) { | |
bec39940 | 3111 | nb_chan = lttng_ht_get_count( |
b551a063 DG |
3112 | session->ust_session->domain_global.channels); |
3113 | } | |
0df502fd | 3114 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3115 | break; |
3116 | default: | |
3117 | *channels = NULL; | |
1ab1ea0b | 3118 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3119 | goto error; |
3120 | } | |
3121 | ||
b551a063 DG |
3122 | if (nb_chan > 0) { |
3123 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3124 | if (*channels == NULL) { | |
3125 | ret = -LTTCOMM_FATAL; | |
3126 | goto error; | |
3127 | } | |
54d01ffb | 3128 | |
b551a063 DG |
3129 | list_lttng_channels(domain, session, *channels); |
3130 | } else { | |
3131 | *channels = NULL; | |
3132 | } | |
2bdd86d4 | 3133 | |
54d01ffb DG |
3134 | return nb_chan; |
3135 | ||
3136 | error: | |
3137 | return ret; | |
3138 | } | |
3139 | ||
3140 | /* | |
3141 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3142 | */ | |
b551a063 | 3143 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3144 | char *channel_name, struct lttng_event **events) |
3145 | { | |
b551a063 | 3146 | int ret = 0; |
54d01ffb | 3147 | ssize_t nb_event = 0; |
54d01ffb | 3148 | |
b551a063 DG |
3149 | switch (domain) { |
3150 | case LTTNG_DOMAIN_KERNEL: | |
3151 | if (session->kernel_session != NULL) { | |
3152 | nb_event = list_lttng_kernel_events(channel_name, | |
3153 | session->kernel_session, events); | |
54d01ffb | 3154 | } |
b551a063 DG |
3155 | break; |
3156 | case LTTNG_DOMAIN_UST: | |
3157 | { | |
3158 | if (session->ust_session != NULL) { | |
3159 | nb_event = list_lttng_ust_global_events(channel_name, | |
3160 | &session->ust_session->domain_global, events); | |
3161 | } | |
3162 | break; | |
54d01ffb | 3163 | } |
b551a063 | 3164 | default: |
1ab1ea0b | 3165 | ret = -LTTCOMM_UND; |
54d01ffb DG |
3166 | goto error; |
3167 | } | |
3168 | ||
b551a063 | 3169 | ret = nb_event; |
54d01ffb DG |
3170 | |
3171 | error: | |
3172 | return ret; | |
3173 | } | |
3174 | ||
3175 | /* | |
3176 | * Process the command requested by the lttng client within the command | |
3177 | * context structure. This function make sure that the return structure (llm) | |
3178 | * is set and ready for transmission before returning. | |
3179 | * | |
3180 | * Return any error encountered or 0 for success. | |
3181 | */ | |
3182 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3183 | { | |
3184 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3185 | int need_tracing_session = 1; |
2e09ba09 | 3186 | int need_domain; |
54d01ffb DG |
3187 | |
3188 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3189 | ||
2e09ba09 MD |
3190 | switch (cmd_ctx->lsm->cmd_type) { |
3191 | case LTTNG_CREATE_SESSION: | |
3192 | case LTTNG_DESTROY_SESSION: | |
3193 | case LTTNG_LIST_SESSIONS: | |
3194 | case LTTNG_LIST_DOMAINS: | |
3195 | case LTTNG_START_TRACE: | |
3196 | case LTTNG_STOP_TRACE: | |
3197 | need_domain = 0; | |
3aace903 | 3198 | break; |
2e09ba09 MD |
3199 | default: |
3200 | need_domain = 1; | |
3201 | } | |
3202 | ||
3203 | if (opt_no_kernel && need_domain | |
3204 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 MD |
3205 | if (!is_root) { |
3206 | ret = LTTCOMM_NEED_ROOT_SESSIOND; | |
3207 | } else { | |
3208 | ret = LTTCOMM_KERN_NA; | |
3209 | } | |
4fba7219 DG |
3210 | goto error; |
3211 | } | |
3212 | ||
54d01ffb DG |
3213 | /* |
3214 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3215 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3216 | * command. |
3217 | */ | |
3218 | switch(cmd_ctx->lsm->cmd_type) { | |
3219 | case LTTNG_LIST_SESSIONS: | |
3220 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 3221 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
3222 | case LTTNG_LIST_DOMAINS: |
3223 | case LTTNG_LIST_CHANNELS: | |
3224 | case LTTNG_LIST_EVENTS: | |
3225 | break; | |
3226 | default: | |
3227 | /* Setup lttng message with no payload */ | |
3228 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3229 | if (ret < 0) { | |
3230 | /* This label does not try to unlock the session */ | |
3231 | goto init_setup_error; | |
3232 | } | |
3233 | } | |
3234 | ||
3235 | /* Commands that DO NOT need a session. */ | |
3236 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 3237 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 3238 | case LTTNG_CALIBRATE: |
54d01ffb DG |
3239 | case LTTNG_LIST_SESSIONS: |
3240 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 3241 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 3242 | need_tracing_session = 0; |
54d01ffb DG |
3243 | break; |
3244 | default: | |
3245 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
3246 | /* |
3247 | * We keep the session list lock across _all_ commands | |
3248 | * for now, because the per-session lock does not | |
3249 | * handle teardown properly. | |
3250 | */ | |
74babd95 | 3251 | session_lock_list(); |
54d01ffb DG |
3252 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
3253 | if (cmd_ctx->session == NULL) { | |
3254 | if (cmd_ctx->lsm->session.name != NULL) { | |
3255 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3256 | } else { | |
3257 | /* If no session name specified */ | |
3258 | ret = LTTCOMM_SELECT_SESS; | |
3259 | } | |
3260 | goto error; | |
3261 | } else { | |
3262 | /* Acquire lock for the session */ | |
3263 | session_lock(cmd_ctx->session); | |
3264 | } | |
3265 | break; | |
3266 | } | |
b389abbe | 3267 | |
2e09ba09 MD |
3268 | if (!need_domain) { |
3269 | goto skip_domain; | |
3270 | } | |
54d01ffb DG |
3271 | /* |
3272 | * Check domain type for specific "pre-action". | |
3273 | */ | |
3274 | switch (cmd_ctx->lsm->domain.type) { | |
3275 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3276 | if (!is_root) { |
531d29f9 | 3277 | ret = LTTCOMM_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3278 | goto error; |
3279 | } | |
3280 | ||
54d01ffb | 3281 | /* Kernel tracer check */ |
a4b35e07 | 3282 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3283 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3284 | ret = init_kernel_tracer(); |
3285 | if (ret != 0) { | |
54d01ffb DG |
3286 | goto error; |
3287 | } | |
3288 | } | |
5eb91c98 | 3289 | |
5c827ce0 DG |
3290 | /* Consumer is in an ERROR state. Report back to client */ |
3291 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
3292 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
3293 | goto error; | |
3294 | } | |
3295 | ||
54d01ffb | 3296 | /* Need a session for kernel command */ |
44d3bd01 | 3297 | if (need_tracing_session) { |
54d01ffb | 3298 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3299 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3300 | if (ret < 0) { |
54d01ffb | 3301 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3302 | goto error; |
3303 | } | |
b389abbe | 3304 | } |
7d29a247 | 3305 | |
54d01ffb | 3306 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3307 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3308 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3309 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3310 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3311 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3312 | if (ret < 0) { |
54d01ffb DG |
3313 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3314 | goto error; | |
950131af | 3315 | } |
5c827ce0 | 3316 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3317 | } else { |
3318 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3319 | } |
0d0c377a | 3320 | } |
5c827ce0 | 3321 | |
54d01ffb | 3322 | break; |
2bdd86d4 | 3323 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3324 | { |
5c827ce0 DG |
3325 | /* Consumer is in an ERROR state. Report back to client */ |
3326 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
3327 | ret = LTTCOMM_NO_USTCONSUMERD; | |
3328 | goto error; | |
3329 | } | |
3330 | ||
44d3bd01 | 3331 | if (need_tracing_session) { |
f6a9efaa | 3332 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3333 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3334 | &cmd_ctx->lsm->domain); |
44d3bd01 DG |
3335 | if (ret != LTTCOMM_OK) { |
3336 | goto error; | |
3337 | } | |
3338 | } | |
7753dea8 MD |
3339 | /* Start the UST consumer daemons */ |
3340 | /* 64-bit */ | |
3341 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3342 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3343 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3344 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3345 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3346 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3347 | if (ret < 0) { |
7753dea8 MD |
3348 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3349 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3350 | goto error; |
3351 | } | |
48842b30 | 3352 | |
7753dea8 | 3353 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
5c827ce0 | 3354 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3355 | } else { |
7753dea8 MD |
3356 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3357 | } | |
3358 | /* 32-bit */ | |
fc7a59ce | 3359 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3360 | ustconsumer32_data.pid == 0 && |
3361 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3362 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3363 | ret = start_consumerd(&ustconsumer32_data); | |
3364 | if (ret < 0) { | |
3365 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3366 | ust_consumerd32_fd = -EINVAL; | |
3367 | goto error; | |
3368 | } | |
5c827ce0 | 3369 | |
7753dea8 | 3370 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; |
5c827ce0 | 3371 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3372 | } else { |
3373 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3374 | } |
44d3bd01 DG |
3375 | } |
3376 | break; | |
48842b30 | 3377 | } |
54d01ffb | 3378 | default: |
54d01ffb DG |
3379 | break; |
3380 | } | |
2e09ba09 | 3381 | skip_domain: |
33a2b854 | 3382 | |
5c827ce0 DG |
3383 | /* Validate consumer daemon state when start/stop trace command */ |
3384 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3385 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3386 | switch (cmd_ctx->lsm->domain.type) { | |
3387 | case LTTNG_DOMAIN_UST: | |
3388 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
3389 | ret = LTTCOMM_NO_USTCONSUMERD; | |
3390 | goto error; | |
3391 | } | |
3392 | break; | |
3393 | case LTTNG_DOMAIN_KERNEL: | |
3394 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
3395 | ret = LTTCOMM_NO_KERNCONSUMERD; | |
3396 | goto error; | |
3397 | } | |
3398 | break; | |
3399 | } | |
3400 | } | |
3401 | ||
8e0af1b4 MD |
3402 | /* |
3403 | * Check that the UID or GID match that of the tracing session. | |
3404 | * The root user can interact with all sessions. | |
3405 | */ | |
3406 | if (need_tracing_session) { | |
3407 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3408 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3409 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
8e0af1b4 MD |
3410 | ret = LTTCOMM_EPERM; |
3411 | goto error; | |
3412 | } | |
3413 | } | |
3414 | ||
54d01ffb DG |
3415 | /* Process by command type */ |
3416 | switch (cmd_ctx->lsm->cmd_type) { | |
3417 | case LTTNG_ADD_CONTEXT: | |
3418 | { | |
3419 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3420 | cmd_ctx->lsm->u.context.channel_name, | |
3421 | cmd_ctx->lsm->u.context.event_name, | |
3422 | &cmd_ctx->lsm->u.context.ctx); | |
3423 | break; | |
3424 | } | |
3425 | case LTTNG_DISABLE_CHANNEL: | |
3426 | { | |
3427 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3428 | cmd_ctx->lsm->u.disable.channel_name); | |
3429 | break; | |
3430 | } | |
3431 | case LTTNG_DISABLE_EVENT: | |
3432 | { | |
3433 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3434 | cmd_ctx->lsm->u.disable.channel_name, | |
3435 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3436 | break; |
3437 | } | |
54d01ffb DG |
3438 | case LTTNG_DISABLE_ALL_EVENT: |
3439 | { | |
2bdd86d4 | 3440 | DBG("Disabling all events"); |
54d01ffb DG |
3441 | |
3442 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3443 | cmd_ctx->lsm->u.disable.channel_name); | |
3444 | break; | |
3445 | } | |
3446 | case LTTNG_ENABLE_CHANNEL: | |
3447 | { | |
aea829b3 | 3448 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3449 | &cmd_ctx->lsm->u.channel.chan); |
3450 | break; | |
3451 | } | |
3452 | case LTTNG_ENABLE_EVENT: | |
3453 | { | |
3454 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3455 | cmd_ctx->lsm->u.enable.channel_name, | |
3456 | &cmd_ctx->lsm->u.enable.event); | |
3457 | break; | |
3458 | } | |
3459 | case LTTNG_ENABLE_ALL_EVENT: | |
3460 | { | |
2bdd86d4 | 3461 | DBG("Enabling all events"); |
54d01ffb DG |
3462 | |
3463 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3464 | cmd_ctx->lsm->u.enable.channel_name, |
3465 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3466 | break; |
3467 | } | |
052da939 | 3468 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3469 | { |
9f19cc17 | 3470 | struct lttng_event *events; |
54d01ffb | 3471 | ssize_t nb_events; |
052da939 | 3472 | |
54d01ffb DG |
3473 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3474 | if (nb_events < 0) { | |
3475 | ret = -nb_events; | |
3476 | goto error; | |
2ef84c95 DG |
3477 | } |
3478 | ||
3479 | /* | |
3480 | * Setup lttng message with payload size set to the event list size in | |
3481 | * bytes and then copy list into the llm payload. | |
3482 | */ | |
052da939 | 3483 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3484 | if (ret < 0) { |
052da939 | 3485 | free(events); |
2ef84c95 DG |
3486 | goto setup_error; |
3487 | } | |
3488 | ||
3489 | /* Copy event list into message payload */ | |
9f19cc17 | 3490 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3491 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3492 | |
9f19cc17 | 3493 | free(events); |
2ef84c95 DG |
3494 | |
3495 | ret = LTTCOMM_OK; | |
3496 | break; | |
3497 | } | |
f37d259d MD |
3498 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3499 | { | |
3500 | struct lttng_event_field *fields; | |
3501 | ssize_t nb_fields; | |
3502 | ||
3503 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, &fields); | |
3504 | if (nb_fields < 0) { | |
3505 | ret = -nb_fields; | |
3506 | goto error; | |
3507 | } | |
3508 | ||
3509 | /* | |
3510 | * Setup lttng message with payload size set to the event list size in | |
3511 | * bytes and then copy list into the llm payload. | |
3512 | */ | |
3513 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event_field) * nb_fields); | |
3514 | if (ret < 0) { | |
3515 | free(fields); | |
3516 | goto setup_error; | |
3517 | } | |
3518 | ||
3519 | /* Copy event list into message payload */ | |
3520 | memcpy(cmd_ctx->llm->payload, fields, | |
3521 | sizeof(struct lttng_event_field) * nb_fields); | |
3522 | ||
3523 | free(fields); | |
3524 | ||
3525 | ret = LTTCOMM_OK; | |
3526 | break; | |
3527 | } | |
3528 | ||
f3ed775e | 3529 | case LTTNG_START_TRACE: |
8c0faa1d | 3530 | { |
54d01ffb | 3531 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3532 | break; |
3533 | } | |
f3ed775e | 3534 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3535 | { |
54d01ffb | 3536 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3537 | break; |
3538 | } | |
5e16da05 MD |
3539 | case LTTNG_CREATE_SESSION: |
3540 | { | |
54d01ffb | 3541 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
6df2e2c9 | 3542 | cmd_ctx->lsm->session.path, &cmd_ctx->creds); |
5e16da05 MD |
3543 | break; |
3544 | } | |
3545 | case LTTNG_DESTROY_SESSION: | |
3546 | { | |
54d01ffb DG |
3547 | ret = cmd_destroy_session(cmd_ctx->session, |
3548 | cmd_ctx->lsm->session.name); | |
256a5576 MD |
3549 | /* |
3550 | * Set session to NULL so we do not unlock it after | |
3551 | * free. | |
3552 | */ | |
3553 | cmd_ctx->session = NULL; | |
5461b305 | 3554 | break; |
5e16da05 | 3555 | } |
9f19cc17 | 3556 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3557 | { |
54d01ffb DG |
3558 | ssize_t nb_dom; |
3559 | struct lttng_domain *domains; | |
5461b305 | 3560 | |
54d01ffb DG |
3561 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3562 | if (nb_dom < 0) { | |
3563 | ret = -nb_dom; | |
3564 | goto error; | |
ce3d728c | 3565 | } |
520ff687 | 3566 | |
54d01ffb | 3567 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3568 | if (ret < 0) { |
3569 | goto setup_error; | |
520ff687 | 3570 | } |
57167058 | 3571 | |
54d01ffb DG |
3572 | /* Copy event list into message payload */ |
3573 | memcpy(cmd_ctx->llm->payload, domains, | |
3574 | nb_dom * sizeof(struct lttng_domain)); | |
3575 | ||
3576 | free(domains); | |
5e16da05 | 3577 | |
5461b305 | 3578 | ret = LTTCOMM_OK; |
5e16da05 MD |
3579 | break; |
3580 | } | |
9f19cc17 | 3581 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3582 | { |
6775595e | 3583 | int nb_chan; |
54d01ffb DG |
3584 | struct lttng_channel *channels; |
3585 | ||
b551a063 DG |
3586 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3587 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3588 | if (nb_chan < 0) { |
3589 | ret = -nb_chan; | |
3590 | goto error; | |
5461b305 | 3591 | } |
ca95a216 | 3592 | |
54d01ffb | 3593 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3594 | if (ret < 0) { |
3595 | goto setup_error; | |
3596 | } | |
9f19cc17 | 3597 | |
54d01ffb DG |
3598 | /* Copy event list into message payload */ |
3599 | memcpy(cmd_ctx->llm->payload, channels, | |
3600 | nb_chan * sizeof(struct lttng_channel)); | |
3601 | ||
3602 | free(channels); | |
9f19cc17 DG |
3603 | |
3604 | ret = LTTCOMM_OK; | |
5461b305 | 3605 | break; |
5e16da05 | 3606 | } |
9f19cc17 | 3607 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3608 | { |
b551a063 | 3609 | ssize_t nb_event; |
684d34d2 | 3610 | struct lttng_event *events = NULL; |
9f19cc17 | 3611 | |
b551a063 | 3612 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3613 | cmd_ctx->lsm->u.list.channel_name, &events); |
3614 | if (nb_event < 0) { | |
3615 | ret = -nb_event; | |
3616 | goto error; | |
5461b305 | 3617 | } |
ca95a216 | 3618 | |
54d01ffb | 3619 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3620 | if (ret < 0) { |
3621 | goto setup_error; | |
3622 | } | |
9f19cc17 | 3623 | |
54d01ffb DG |
3624 | /* Copy event list into message payload */ |
3625 | memcpy(cmd_ctx->llm->payload, events, | |
3626 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3627 | |
54d01ffb | 3628 | free(events); |
9f19cc17 DG |
3629 | |
3630 | ret = LTTCOMM_OK; | |
5461b305 | 3631 | break; |
5e16da05 MD |
3632 | } |
3633 | case LTTNG_LIST_SESSIONS: | |
3634 | { | |
8e0af1b4 | 3635 | unsigned int nr_sessions; |
5461b305 | 3636 | |
8e0af1b4 | 3637 | session_lock_list(); |
730389d9 DG |
3638 | nr_sessions = lttng_sessions_count( |
3639 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3640 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3641 | |
8e0af1b4 | 3642 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3643 | if (ret < 0) { |
54d01ffb | 3644 | session_unlock_list(); |
5461b305 | 3645 | goto setup_error; |
e065084a | 3646 | } |
5e16da05 | 3647 | |
6c9cc2ab | 3648 | /* Filled the session array */ |
8e0af1b4 | 3649 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3650 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3651 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3652 | |
54d01ffb | 3653 | session_unlock_list(); |
5e16da05 | 3654 | |
5461b305 | 3655 | ret = LTTCOMM_OK; |
5e16da05 MD |
3656 | break; |
3657 | } | |
d0254c7c MD |
3658 | case LTTNG_CALIBRATE: |
3659 | { | |
54d01ffb DG |
3660 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3661 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3662 | break; |
3663 | } | |
d9800920 DG |
3664 | case LTTNG_REGISTER_CONSUMER: |
3665 | { | |
54d01ffb DG |
3666 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3667 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3668 | break; |
3669 | } | |
5e16da05 | 3670 | default: |
5e16da05 | 3671 | ret = LTTCOMM_UND; |
5461b305 | 3672 | break; |
fac6795d DG |
3673 | } |
3674 | ||
5461b305 | 3675 | error: |
5461b305 DG |
3676 | if (cmd_ctx->llm == NULL) { |
3677 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3678 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3679 | goto setup_error; |
3680 | } | |
3681 | } | |
54d01ffb | 3682 | /* Set return code */ |
5461b305 | 3683 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3684 | setup_error: |
b5541356 | 3685 | if (cmd_ctx->session) { |
54d01ffb | 3686 | session_unlock(cmd_ctx->session); |
b5541356 | 3687 | } |
256a5576 MD |
3688 | if (need_tracing_session) { |
3689 | session_unlock_list(); | |
3690 | } | |
54d01ffb | 3691 | init_setup_error: |
8028d920 | 3692 | return ret; |
fac6795d DG |
3693 | } |
3694 | ||
1d4b027a | 3695 | /* |
d063d709 DG |
3696 | * This thread manage all clients request using the unix client socket for |
3697 | * communication. | |
1d4b027a DG |
3698 | */ |
3699 | static void *thread_manage_clients(void *data) | |
3700 | { | |
a4b35e07 | 3701 | int sock = -1, ret, i, pollfd; |
5eb91c98 | 3702 | uint32_t revents, nb_fd; |
273ea72c | 3703 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3704 | struct lttng_poll_event events; |
1d4b027a DG |
3705 | |
3706 | DBG("[thread] Manage client started"); | |
3707 | ||
f6a9efaa DG |
3708 | rcu_register_thread(); |
3709 | ||
1d4b027a DG |
3710 | ret = lttcomm_listen_unix_sock(client_sock); |
3711 | if (ret < 0) { | |
3712 | goto error; | |
3713 | } | |
3714 | ||
5eb91c98 DG |
3715 | /* |
3716 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3717 | * more will be added to this poll set. | |
3718 | */ | |
3719 | ret = create_thread_poll_set(&events, 2); | |
3720 | if (ret < 0) { | |
3721 | goto error; | |
3722 | } | |
273ea72c | 3723 | |
5eb91c98 DG |
3724 | /* Add the application registration socket */ |
3725 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3726 | if (ret < 0) { | |
3727 | goto error; | |
3728 | } | |
273ea72c | 3729 | |
bbd973c2 DG |
3730 | /* |
3731 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3732 | */ |
3733 | if (opt_sig_parent) { | |
8db8d1dc | 3734 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3735 | } |
3736 | ||
3737 | while (1) { | |
1d4b027a | 3738 | DBG("Accepting client command ..."); |
273ea72c | 3739 | |
5eb91c98 DG |
3740 | nb_fd = LTTNG_POLL_GETNB(&events); |
3741 | ||
273ea72c | 3742 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 3743 | restart: |
5eb91c98 | 3744 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3745 | if (ret < 0) { |
88f2b785 MD |
3746 | /* |
3747 | * Restart interrupted system call. | |
3748 | */ | |
3749 | if (errno == EINTR) { | |
3750 | goto restart; | |
3751 | } | |
273ea72c DG |
3752 | goto error; |
3753 | } | |
3754 | ||
5eb91c98 DG |
3755 | for (i = 0; i < nb_fd; i++) { |
3756 | /* Fetch once the poll data */ | |
3757 | revents = LTTNG_POLL_GETEV(&events, i); | |
3758 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3759 | ||
3760 | /* Thread quit pipe has been closed. Killing thread. */ | |
3761 | ret = check_thread_quit_pipe(pollfd, revents); | |
3762 | if (ret) { | |
3763 | goto error; | |
3764 | } | |
3765 | ||
3766 | /* Event on the registration socket */ | |
3767 | if (pollfd == client_sock) { | |
3768 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3769 | ERR("Client socket poll error"); | |
3770 | goto error; | |
3771 | } | |
3772 | } | |
3773 | } | |
3774 | ||
3775 | DBG("Wait for client response"); | |
3776 | ||
3777 | sock = lttcomm_accept_unix_sock(client_sock); | |
3778 | if (sock < 0) { | |
273ea72c | 3779 | goto error; |
273ea72c DG |
3780 | } |
3781 | ||
be040666 DG |
3782 | /* Set socket option for credentials retrieval */ |
3783 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3784 | if (ret < 0) { | |
3785 | goto error; | |
3786 | } | |
3787 | ||
5eb91c98 | 3788 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3789 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3790 | if (cmd_ctx == NULL) { |
76d7553f | 3791 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3792 | goto error; |
5eb91c98 | 3793 | } |
1d4b027a | 3794 | |
5eb91c98 | 3795 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3796 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3797 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3798 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3799 | goto error; |
3800 | } | |
1d4b027a | 3801 | |
5eb91c98 DG |
3802 | cmd_ctx->llm = NULL; |
3803 | cmd_ctx->session = NULL; | |
1d4b027a | 3804 | |
5eb91c98 DG |
3805 | /* |
3806 | * Data is received from the lttng client. The struct | |
3807 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3808 | * the client. | |
3809 | */ | |
3810 | DBG("Receiving data from client ..."); | |
be040666 DG |
3811 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3812 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3813 | if (ret <= 0) { |
3814 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3815 | ret = close(sock); |
3816 | if (ret) { | |
3817 | PERROR("close"); | |
3818 | } | |
3819 | sock = -1; | |
a2c0da86 | 3820 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3821 | continue; |
3822 | } | |
1d4b027a | 3823 | |
5eb91c98 DG |
3824 | // TODO: Validate cmd_ctx including sanity check for |
3825 | // security purpose. | |
f7776ea7 | 3826 | |
f6a9efaa | 3827 | rcu_thread_online(); |
5eb91c98 DG |
3828 | /* |
3829 | * This function dispatch the work to the kernel or userspace tracer | |
3830 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3831 | * informations for the client. The command context struct contains | |
3832 | * everything this function may needs. | |
3833 | */ | |
3834 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3835 | rcu_thread_offline(); |
5eb91c98 | 3836 | if (ret < 0) { |
bbd973c2 | 3837 | /* |
5eb91c98 | 3838 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3839 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3840 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3841 | */ |
bbd973c2 | 3842 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3843 | continue; |
3844 | } | |
d6e4fca4 | 3845 | |
54d01ffb DG |
3846 | DBG("Sending response (size: %d, retcode: %s)", |
3847 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3848 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3849 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3850 | if (ret < 0) { |
3851 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3852 | } |
1d4b027a | 3853 | |
5eb91c98 | 3854 | /* End of transmission */ |
76d7553f MD |
3855 | ret = close(sock); |
3856 | if (ret) { | |
3857 | PERROR("close"); | |
3858 | } | |
3859 | sock = -1; | |
be040666 DG |
3860 | |
3861 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3862 | } |
3863 | ||
5eb91c98 DG |
3864 | error: |
3865 | DBG("Client thread dying"); | |
273ea72c | 3866 | unlink(client_unix_sock_path); |
76d7553f MD |
3867 | if (client_sock >= 0) { |
3868 | ret = close(client_sock); | |
3869 | if (ret) { | |
3870 | PERROR("close"); | |
3871 | } | |
a4b35e07 MD |
3872 | } |
3873 | if (sock >= 0) { | |
76d7553f MD |
3874 | ret = close(sock); |
3875 | if (ret) { | |
3876 | PERROR("close"); | |
3877 | } | |
a4b35e07 | 3878 | } |
273ea72c | 3879 | |
5eb91c98 | 3880 | lttng_poll_clean(&events); |
a2fb29a5 | 3881 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3882 | |
3883 | rcu_unregister_thread(); | |
1d4b027a DG |
3884 | return NULL; |
3885 | } | |
3886 | ||
3887 | ||
fac6795d DG |
3888 | /* |
3889 | * usage function on stderr | |
3890 | */ | |
3891 | static void usage(void) | |
3892 | { | |
b716ce68 | 3893 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3894 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3895 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3896 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3897 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3898 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3899 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3900 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3901 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3902 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3903 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3904 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3905 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3906 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3907 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3908 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3909 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3910 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3911 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3912 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3913 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3914 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3915 | } |
3916 | ||
3917 | /* | |
3918 | * daemon argument parsing | |
3919 | */ | |
3920 | static int parse_args(int argc, char **argv) | |
3921 | { | |
3922 | int c; | |
3923 | ||
3924 | static struct option long_options[] = { | |
3925 | { "client-sock", 1, 0, 'c' }, | |
3926 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3927 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3928 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3929 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3930 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3931 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3932 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3933 | { "consumerd32-path", 1, 0, 'u' }, | |
3934 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3935 | { "consumerd64-path", 1, 0, 't' }, | |
3936 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3937 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3938 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3939 | { "help", 0, 0, 'h' }, |
3940 | { "group", 1, 0, 'g' }, | |
3941 | { "version", 0, 0, 'V' }, | |
75462a81 | 3942 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3943 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3944 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3945 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3946 | { NULL, 0, 0, 0 } |
3947 | }; | |
3948 | ||
3949 | while (1) { | |
3950 | int option_index = 0; | |
4fba7219 | 3951 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3952 | long_options, &option_index); |
fac6795d DG |
3953 | if (c == -1) { |
3954 | break; | |
3955 | } | |
3956 | ||
3957 | switch (c) { | |
3958 | case 0: | |
3959 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3960 | if (optarg) { | |
3961 | fprintf(stderr, " with arg %s\n", optarg); | |
3962 | } | |
3963 | break; | |
b716ce68 | 3964 | case 'c': |
fac6795d DG |
3965 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3966 | break; | |
3967 | case 'a': | |
3968 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3969 | break; | |
3970 | case 'd': | |
3971 | opt_daemon = 1; | |
3972 | break; | |
3973 | case 'g': | |
fb09408a | 3974 | opt_tracing_group = optarg; |
fac6795d DG |
3975 | break; |
3976 | case 'h': | |
3977 | usage(); | |
3978 | exit(EXIT_FAILURE); | |
3979 | case 'V': | |
3980 | fprintf(stdout, "%s\n", VERSION); | |
3981 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3982 | case 'S': |
3983 | opt_sig_parent = 1; | |
3984 | break; | |
d6f42150 | 3985 | case 'E': |
3bd1e081 | 3986 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3987 | break; |
3988 | case 'C': | |
3bd1e081 MD |
3989 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3990 | break; | |
3991 | case 'F': | |
7753dea8 | 3992 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3993 | break; |
3994 | case 'D': | |
7753dea8 MD |
3995 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3996 | break; | |
3997 | case 'H': | |
3998 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3999 | break; | |
4000 | case 'G': | |
4001 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 4002 | break; |
4fba7219 DG |
4003 | case 'N': |
4004 | opt_no_kernel = 1; | |
4005 | break; | |
75462a81 | 4006 | case 'q': |
97e19046 | 4007 | lttng_opt_quiet = 1; |
75462a81 | 4008 | break; |
3f9947db | 4009 | case 'v': |
53086306 | 4010 | /* Verbose level can increase using multiple -v */ |
97e19046 | 4011 | lttng_opt_verbose += 1; |
3f9947db | 4012 | break; |
31f73cc9 | 4013 | case 'Z': |
3bd1e081 | 4014 | opt_verbose_consumer += 1; |
31f73cc9 | 4015 | break; |
fb09408a | 4016 | case 'u': |
fc7a59ce | 4017 | consumerd32_bin= optarg; |
ebaeda94 MD |
4018 | break; |
4019 | case 'U': | |
4020 | consumerd32_libdir = optarg; | |
7753dea8 MD |
4021 | break; |
4022 | case 't': | |
fc7a59ce | 4023 | consumerd64_bin = optarg; |
ebaeda94 MD |
4024 | break; |
4025 | case 'T': | |
4026 | consumerd64_libdir = optarg; | |
fb09408a | 4027 | break; |
fac6795d DG |
4028 | default: |
4029 | /* Unknown option or other error. | |
4030 | * Error is printed by getopt, just return */ | |
4031 | return -1; | |
4032 | } | |
4033 | } | |
4034 | ||
4035 | return 0; | |
4036 | } | |
4037 | ||
4038 | /* | |
d063d709 | 4039 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4040 | * apps_sock - The communication socket for all UST apps. |
4041 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4042 | */ |
cf3af59e | 4043 | static int init_daemon_socket(void) |
fac6795d DG |
4044 | { |
4045 | int ret = 0; | |
4046 | mode_t old_umask; | |
4047 | ||
4048 | old_umask = umask(0); | |
4049 | ||
4050 | /* Create client tool unix socket */ | |
d6f42150 DG |
4051 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4052 | if (client_sock < 0) { | |
4053 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4054 | ret = -1; |
4055 | goto end; | |
4056 | } | |
4057 | ||
4058 | /* File permission MUST be 660 */ | |
4059 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4060 | if (ret < 0) { | |
d6f42150 | 4061 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4062 | PERROR("chmod"); |
fac6795d DG |
4063 | goto end; |
4064 | } | |
4065 | ||
4066 | /* Create the application unix socket */ | |
d6f42150 DG |
4067 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4068 | if (apps_sock < 0) { | |
4069 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4070 | ret = -1; |
4071 | goto end; | |
4072 | } | |
4073 | ||
d6f42150 | 4074 | /* File permission MUST be 666 */ |
54d01ffb DG |
4075 | ret = chmod(apps_unix_sock_path, |
4076 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4077 | if (ret < 0) { |
d6f42150 | 4078 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4079 | PERROR("chmod"); |
fac6795d DG |
4080 | goto end; |
4081 | } | |
4082 | ||
4083 | end: | |
4084 | umask(old_umask); | |
4085 | return ret; | |
4086 | } | |
4087 | ||
4088 | /* | |
54d01ffb DG |
4089 | * Check if the global socket is available, and if a daemon is answering at the |
4090 | * other side. If yes, error is returned. | |
fac6795d | 4091 | */ |
cf3af59e | 4092 | static int check_existing_daemon(void) |
fac6795d | 4093 | { |
7d8234d9 | 4094 | /* Is there anybody out there ? */ |
099e26bd | 4095 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4096 | return -EEXIST; |
099e26bd | 4097 | } |
b09c7c76 DG |
4098 | |
4099 | return 0; | |
fac6795d DG |
4100 | } |
4101 | ||
fac6795d | 4102 | /* |
d063d709 | 4103 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4104 | * |
d063d709 | 4105 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4106 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4107 | */ |
be040666 | 4108 | static int set_permissions(char *rundir) |
fac6795d DG |
4109 | { |
4110 | int ret; | |
996b65c8 | 4111 | gid_t gid; |
fac6795d | 4112 | |
6775595e DG |
4113 | ret = allowed_group(); |
4114 | if (ret < 0) { | |
be040666 DG |
4115 | WARN("No tracing group detected"); |
4116 | ret = 0; | |
fac6795d DG |
4117 | goto end; |
4118 | } | |
4119 | ||
6775595e DG |
4120 | gid = ret; |
4121 | ||
d6f42150 | 4122 | /* Set lttng run dir */ |
be040666 | 4123 | ret = chown(rundir, 0, gid); |
d6f42150 | 4124 | if (ret < 0) { |
be040666 | 4125 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4126 | PERROR("chown"); |
d6f42150 DG |
4127 | } |
4128 | ||
d1613cf5 | 4129 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4130 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4131 | if (ret < 0) { |
4132 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4133 | PERROR("chmod"); |
d1613cf5 JN |
4134 | } |
4135 | ||
d6f42150 | 4136 | /* lttng client socket path */ |
996b65c8 | 4137 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4138 | if (ret < 0) { |
d6f42150 | 4139 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4140 | PERROR("chown"); |
d6f42150 DG |
4141 | } |
4142 | ||
3bd1e081 MD |
4143 | /* kconsumer error socket path */ |
4144 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4145 | if (ret < 0) { |
3bd1e081 | 4146 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4147 | PERROR("chown"); |
3bd1e081 MD |
4148 | } |
4149 | ||
7753dea8 MD |
4150 | /* 64-bit ustconsumer error socket path */ |
4151 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4152 | if (ret < 0) { | |
4153 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4154 | PERROR("chown"); |
7753dea8 MD |
4155 | } |
4156 | ||
4157 | /* 32-bit ustconsumer compat32 error socket path */ | |
4158 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4159 | if (ret < 0) { |
7753dea8 | 4160 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4161 | PERROR("chown"); |
fac6795d DG |
4162 | } |
4163 | ||
d6f42150 | 4164 | DBG("All permissions are set"); |
e07ae692 | 4165 | |
fac6795d DG |
4166 | end: |
4167 | return ret; | |
4168 | } | |
4169 | ||
7a485870 | 4170 | /* |
d063d709 | 4171 | * Create the pipe used to wake up the kernel thread. |
76d7553f | 4172 | * Closed in cleanup(). |
7a485870 DG |
4173 | */ |
4174 | static int create_kernel_poll_pipe(void) | |
4175 | { | |
730389d9 DG |
4176 | int ret, i; |
4177 | ||
4178 | ret = pipe(kernel_poll_pipe); | |
4179 | if (ret < 0) { | |
4180 | PERROR("kernel poll pipe"); | |
4181 | goto error; | |
4182 | } | |
4183 | ||
4184 | for (i = 0; i < 2; i++) { | |
4185 | ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC); | |
4186 | if (ret < 0) { | |
4187 | PERROR("fcntl kernel_poll_pipe"); | |
4188 | goto error; | |
4189 | } | |
4190 | } | |
4191 | ||
4192 | error: | |
4193 | return ret; | |
7a485870 DG |
4194 | } |
4195 | ||
099e26bd DG |
4196 | /* |
4197 | * Create the application command pipe to wake thread_manage_apps. | |
76d7553f | 4198 | * Closed in cleanup(). |
099e26bd DG |
4199 | */ |
4200 | static int create_apps_cmd_pipe(void) | |
4201 | { | |
730389d9 DG |
4202 | int ret, i; |
4203 | ||
4204 | ret = pipe(apps_cmd_pipe); | |
4205 | if (ret < 0) { | |
4206 | PERROR("apps cmd pipe"); | |
4207 | goto error; | |
4208 | } | |
4209 | ||
4210 | for (i = 0; i < 2; i++) { | |
4211 | ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
4212 | if (ret < 0) { | |
4213 | PERROR("fcntl apps_cmd_pipe"); | |
4214 | goto error; | |
4215 | } | |
4216 | } | |
4217 | ||
4218 | error: | |
4219 | return ret; | |
099e26bd DG |
4220 | } |
4221 | ||
d6f42150 | 4222 | /* |
d063d709 | 4223 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4224 | */ |
67e40797 | 4225 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4226 | { |
4227 | int ret; | |
4228 | ||
67e40797 DG |
4229 | DBG3("Creating LTTng run directory: %s", rundir); |
4230 | ||
d1613cf5 | 4231 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4232 | if (ret < 0) { |
b1f11e69 | 4233 | if (errno != EEXIST) { |
67e40797 | 4234 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4235 | goto error; |
4236 | } else { | |
4237 | ret = 0; | |
4238 | } | |
d6f42150 DG |
4239 | } |
4240 | ||
4241 | error: | |
4242 | return ret; | |
4243 | } | |
4244 | ||
4245 | /* | |
d063d709 DG |
4246 | * Setup sockets and directory needed by the kconsumerd communication with the |
4247 | * session daemon. | |
d6f42150 | 4248 | */ |
67e40797 DG |
4249 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4250 | const char *rundir) | |
d6f42150 DG |
4251 | { |
4252 | int ret; | |
67e40797 | 4253 | char path[PATH_MAX]; |
d6f42150 | 4254 | |
67e40797 | 4255 | switch (consumer_data->type) { |
7753dea8 | 4256 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4257 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4258 | break; |
4259 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4260 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4261 | break; |
4262 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4263 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4264 | break; |
4265 | default: | |
4266 | ERR("Consumer type unknown"); | |
4267 | ret = -EINVAL; | |
4268 | goto error; | |
d6f42150 DG |
4269 | } |
4270 | ||
67e40797 DG |
4271 | DBG2("Creating consumer directory: %s", path); |
4272 | ||
d1613cf5 | 4273 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4274 | if (ret < 0) { |
6beb2242 | 4275 | if (errno != EEXIST) { |
f11e84c2 | 4276 | PERROR("mkdir"); |
3bd1e081 | 4277 | ERR("Failed to create %s", path); |
6beb2242 DG |
4278 | goto error; |
4279 | } | |
f11e84c2 | 4280 | ret = -1; |
d6f42150 DG |
4281 | } |
4282 | ||
4283 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4284 | consumer_data->err_sock = |
4285 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4286 | if (consumer_data->err_sock < 0) { | |
4287 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4288 | ret = -1; |
4289 | goto error; | |
4290 | } | |
4291 | ||
4292 | /* File permission MUST be 660 */ | |
3bd1e081 | 4293 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4294 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4295 | if (ret < 0) { |
3bd1e081 | 4296 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4297 | PERROR("chmod"); |
d6f42150 DG |
4298 | goto error; |
4299 | } | |
4300 | ||
4301 | error: | |
4302 | return ret; | |
4303 | } | |
4304 | ||
fac6795d | 4305 | /* |
d063d709 | 4306 | * Signal handler for the daemon |
cf3af59e | 4307 | * |
54d01ffb DG |
4308 | * Simply stop all worker threads, leaving main() return gracefully after |
4309 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4310 | */ |
4311 | static void sighandler(int sig) | |
4312 | { | |
4313 | switch (sig) { | |
cf3af59e | 4314 | case SIGPIPE: |
af87c45a | 4315 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4316 | return; |
4317 | case SIGINT: | |
af87c45a | 4318 | DBG("SIGINT caught"); |
cf3af59e MD |
4319 | stop_threads(); |
4320 | break; | |
4321 | case SIGTERM: | |
af87c45a | 4322 | DBG("SIGTERM caught"); |
cf3af59e MD |
4323 | stop_threads(); |
4324 | break; | |
4325 | default: | |
4326 | break; | |
fac6795d | 4327 | } |
fac6795d DG |
4328 | } |
4329 | ||
4330 | /* | |
d063d709 | 4331 | * Setup signal handler for : |
1d4b027a | 4332 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4333 | */ |
1d4b027a | 4334 | static int set_signal_handler(void) |
fac6795d | 4335 | { |
1d4b027a DG |
4336 | int ret = 0; |
4337 | struct sigaction sa; | |
4338 | sigset_t sigset; | |
fac6795d | 4339 | |
1d4b027a | 4340 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4341 | PERROR("sigemptyset"); |
1d4b027a DG |
4342 | return ret; |
4343 | } | |
d6f42150 | 4344 | |
1d4b027a DG |
4345 | sa.sa_handler = sighandler; |
4346 | sa.sa_mask = sigset; | |
4347 | sa.sa_flags = 0; | |
4348 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4349 | PERROR("sigaction"); |
1d4b027a | 4350 | return ret; |
d6f42150 DG |
4351 | } |
4352 | ||
1d4b027a | 4353 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4354 | PERROR("sigaction"); |
1d4b027a | 4355 | return ret; |
d6f42150 | 4356 | } |
aaf26714 | 4357 | |
1d4b027a | 4358 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4359 | PERROR("sigaction"); |
1d4b027a | 4360 | return ret; |
8c0faa1d DG |
4361 | } |
4362 | ||
1d4b027a DG |
4363 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4364 | ||
4365 | return ret; | |
fac6795d DG |
4366 | } |
4367 | ||
f3ed775e | 4368 | /* |
d063d709 DG |
4369 | * Set open files limit to unlimited. This daemon can open a large number of |
4370 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4371 | */ |
4372 | static void set_ulimit(void) | |
4373 | { | |
4374 | int ret; | |
4375 | struct rlimit lim; | |
4376 | ||
a88df331 | 4377 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4378 | lim.rlim_cur = 65535; |
4379 | lim.rlim_max = 65535; | |
4380 | ||
4381 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4382 | if (ret < 0) { | |
76d7553f | 4383 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4384 | } |
4385 | } | |
4386 | ||
fac6795d DG |
4387 | /* |
4388 | * main | |
4389 | */ | |
4390 | int main(int argc, char **argv) | |
4391 | { | |
fac6795d DG |
4392 | int ret = 0; |
4393 | void *status; | |
b082db07 | 4394 | const char *home_path; |
fac6795d | 4395 | |
335a95b7 MD |
4396 | init_kernel_workarounds(); |
4397 | ||
f6a9efaa DG |
4398 | rcu_register_thread(); |
4399 | ||
7753dea8 | 4400 | setup_consumerd_path(); |
fb09408a | 4401 | |
fac6795d DG |
4402 | /* Parse arguments */ |
4403 | progname = argv[0]; | |
4404 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4405 | goto error; |
fac6795d DG |
4406 | } |
4407 | ||
4408 | /* Daemonize */ | |
4409 | if (opt_daemon) { | |
ceed52b5 MD |
4410 | int i; |
4411 | ||
4412 | /* | |
4413 | * fork | |
4414 | * child: setsid, close FD 0, 1, 2, chdir / | |
4415 | * parent: exit (if fork is successful) | |
4416 | */ | |
53094c05 DG |
4417 | ret = daemon(0, 0); |
4418 | if (ret < 0) { | |
76d7553f | 4419 | PERROR("daemon"); |
cf3af59e | 4420 | goto error; |
53094c05 | 4421 | } |
ceed52b5 MD |
4422 | /* |
4423 | * We are in the child. Make sure all other file | |
4424 | * descriptors are closed, in case we are called with | |
4425 | * more opened file descriptors than the standard ones. | |
4426 | */ | |
4427 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4428 | (void) close(i); | |
4429 | } | |
4430 | } | |
4431 | ||
4432 | /* Create thread quit pipe */ | |
4433 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4434 | goto error; | |
fac6795d DG |
4435 | } |
4436 | ||
4437 | /* Check if daemon is UID = 0 */ | |
4438 | is_root = !getuid(); | |
4439 | ||
fac6795d | 4440 | if (is_root) { |
990570ed | 4441 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4442 | |
4443 | /* Create global run dir with root access */ | |
4444 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4445 | if (ret < 0) { |
cf3af59e | 4446 | goto error; |
d6f42150 DG |
4447 | } |
4448 | ||
fac6795d | 4449 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4450 | snprintf(apps_unix_sock_path, PATH_MAX, |
4451 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4452 | } |
4453 | ||
4454 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4455 | snprintf(client_unix_sock_path, PATH_MAX, |
4456 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4457 | } | |
0fdd1e2c DG |
4458 | |
4459 | /* Set global SHM for ust */ | |
4460 | if (strlen(wait_shm_path) == 0) { | |
4461 | snprintf(wait_shm_path, PATH_MAX, | |
4462 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4463 | } | |
67e40797 DG |
4464 | |
4465 | /* Setup kernel consumerd path */ | |
4466 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4467 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4468 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4469 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4470 | |
4471 | DBG2("Kernel consumer err path: %s", | |
4472 | kconsumer_data.err_unix_sock_path); | |
4473 | DBG2("Kernel consumer cmd path: %s", | |
4474 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4475 | } else { |
b082db07 DG |
4476 | home_path = get_home_dir(); |
4477 | if (home_path == NULL) { | |
273ea72c DG |
4478 | /* TODO: Add --socket PATH option */ |
4479 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4480 | ret = -EPERM; |
4481 | goto error; | |
b082db07 DG |
4482 | } |
4483 | ||
67e40797 DG |
4484 | /* |
4485 | * Create rundir from home path. This will create something like | |
4486 | * $HOME/.lttng | |
4487 | */ | |
990570ed | 4488 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4489 | if (ret < 0) { |
4490 | ret = -ENOMEM; | |
4491 | goto error; | |
4492 | } | |
4493 | ||
4494 | ret = create_lttng_rundir(rundir); | |
4495 | if (ret < 0) { | |
4496 | goto error; | |
4497 | } | |
4498 | ||
fac6795d | 4499 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4500 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4501 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4502 | } |
4503 | ||
4504 | /* Set the cli tool unix socket path */ | |
4505 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4506 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4507 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4508 | } |
0fdd1e2c DG |
4509 | |
4510 | /* Set global SHM for ust */ | |
4511 | if (strlen(wait_shm_path) == 0) { | |
4512 | snprintf(wait_shm_path, PATH_MAX, | |
4513 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4514 | } | |
fac6795d DG |
4515 | } |
4516 | ||
5c827ce0 DG |
4517 | /* Set consumer initial state */ |
4518 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4519 | ust_consumerd_state = CONSUMER_STOPPED; | |
4520 | ||
847177cd DG |
4521 | DBG("Client socket path %s", client_unix_sock_path); |
4522 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4523 | DBG("LTTng run directory path: %s", rundir); |
4524 | ||
4525 | /* 32 bits consumerd path setup */ | |
4526 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4527 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4528 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4529 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4530 | |
4531 | DBG2("UST consumer 32 bits err path: %s", | |
4532 | ustconsumer32_data.err_unix_sock_path); | |
4533 | DBG2("UST consumer 32 bits cmd path: %s", | |
4534 | ustconsumer32_data.cmd_unix_sock_path); | |
4535 | ||
4536 | /* 64 bits consumerd path setup */ | |
4537 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4538 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4539 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4540 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4541 | |
4542 | DBG2("UST consumer 64 bits err path: %s", | |
4543 | ustconsumer64_data.err_unix_sock_path); | |
4544 | DBG2("UST consumer 64 bits cmd path: %s", | |
4545 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4546 | |
273ea72c | 4547 | /* |
7d8234d9 | 4548 | * See if daemon already exist. |
fac6795d | 4549 | */ |
7d8234d9 | 4550 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4551 | ERR("Already running daemon.\n"); |
273ea72c | 4552 | /* |
cf3af59e MD |
4553 | * We do not goto exit because we must not cleanup() |
4554 | * because a daemon is already running. | |
ab118b20 | 4555 | */ |
cf3af59e | 4556 | goto error; |
a88df331 DG |
4557 | } |
4558 | ||
1427f9b2 DG |
4559 | /* |
4560 | * Init UST app hash table. Alloc hash table before this point since | |
4561 | * cleanup() can get called after that point. | |
4562 | */ | |
4563 | ust_app_ht_alloc(); | |
4564 | ||
54d01ffb | 4565 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4566 | |
4567 | /* | |
4568 | * These actions must be executed as root. We do that *after* setting up | |
4569 | * the sockets path because we MUST make the check for another daemon using | |
4570 | * those paths *before* trying to set the kernel consumer sockets and init | |
4571 | * kernel tracer. | |
4572 | */ | |
4573 | if (is_root) { | |
67e40797 | 4574 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4575 | if (ret < 0) { |
4576 | goto exit; | |
4577 | } | |
4578 | ||
a88df331 | 4579 | /* Setup kernel tracer */ |
4fba7219 DG |
4580 | if (!opt_no_kernel) { |
4581 | init_kernel_tracer(); | |
4582 | } | |
a88df331 DG |
4583 | |
4584 | /* Set ulimit for open files */ | |
4585 | set_ulimit(); | |
fac6795d | 4586 | } |
4063050c MD |
4587 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4588 | lttng_fd_init(); | |
fac6795d | 4589 | |
67e40797 DG |
4590 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4591 | if (ret < 0) { | |
4592 | goto exit; | |
4593 | } | |
4594 | ||
4595 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4596 | if (ret < 0) { | |
4597 | goto exit; | |
4598 | } | |
4599 | ||
cf3af59e MD |
4600 | if ((ret = set_signal_handler()) < 0) { |
4601 | goto exit; | |
fac6795d DG |
4602 | } |
4603 | ||
d6f42150 | 4604 | /* Setup the needed unix socket */ |
cf3af59e MD |
4605 | if ((ret = init_daemon_socket()) < 0) { |
4606 | goto exit; | |
fac6795d DG |
4607 | } |
4608 | ||
4609 | /* Set credentials to socket */ | |
be040666 | 4610 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4611 | goto exit; |
fac6795d DG |
4612 | } |
4613 | ||
5b8719f5 DG |
4614 | /* Get parent pid if -S, --sig-parent is specified. */ |
4615 | if (opt_sig_parent) { | |
4616 | ppid = getppid(); | |
4617 | } | |
4618 | ||
7a485870 | 4619 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4620 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4621 | goto exit; | |
7a485870 DG |
4622 | } |
4623 | ||
099e26bd DG |
4624 | /* Setup the thread apps communication pipe. */ |
4625 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4626 | goto exit; | |
4627 | } | |
4628 | ||
4629 | /* Init UST command queue. */ | |
4630 | cds_wfq_init(&ust_cmd_queue.queue); | |
4631 | ||
273ea72c | 4632 | /* |
54d01ffb DG |
4633 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4634 | * statically declared in session.c | |
273ea72c | 4635 | */ |
54d01ffb | 4636 | session_list_ptr = session_get_list(); |
b5541356 | 4637 | |
5eb91c98 DG |
4638 | /* Set up max poll set size */ |
4639 | lttng_poll_set_max_size(); | |
4640 | ||
cf3af59e | 4641 | /* Create thread to manage the client socket */ |
099e26bd DG |
4642 | ret = pthread_create(&client_thread, NULL, |
4643 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4644 | if (ret != 0) { |
76d7553f | 4645 | PERROR("pthread_create clients"); |
cf3af59e MD |
4646 | goto exit_client; |
4647 | } | |
fac6795d | 4648 | |
099e26bd DG |
4649 | /* Create thread to dispatch registration */ |
4650 | ret = pthread_create(&dispatch_thread, NULL, | |
4651 | thread_dispatch_ust_registration, (void *) NULL); | |
4652 | if (ret != 0) { | |
76d7553f | 4653 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4654 | goto exit_dispatch; |
4655 | } | |
4656 | ||
4657 | /* Create thread to manage application registration. */ | |
4658 | ret = pthread_create(®_apps_thread, NULL, | |
4659 | thread_registration_apps, (void *) NULL); | |
4660 | if (ret != 0) { | |
76d7553f | 4661 | PERROR("pthread_create registration"); |
099e26bd DG |
4662 | goto exit_reg_apps; |
4663 | } | |
4664 | ||
cf3af59e | 4665 | /* Create thread to manage application socket */ |
54d01ffb DG |
4666 | ret = pthread_create(&apps_thread, NULL, |
4667 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4668 | if (ret != 0) { |
76d7553f | 4669 | PERROR("pthread_create apps"); |
cf3af59e MD |
4670 | goto exit_apps; |
4671 | } | |
fac6795d | 4672 | |
cf3af59e | 4673 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4674 | ret = pthread_create(&kernel_thread, NULL, |
4675 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4676 | if (ret != 0) { |
76d7553f | 4677 | PERROR("pthread_create kernel"); |
cf3af59e MD |
4678 | goto exit_kernel; |
4679 | } | |
7a485870 | 4680 | |
cf3af59e MD |
4681 | ret = pthread_join(kernel_thread, &status); |
4682 | if (ret != 0) { | |
76d7553f | 4683 | PERROR("pthread_join"); |
cf3af59e | 4684 | goto error; /* join error, exit without cleanup */ |
fac6795d DG |
4685 | } |
4686 | ||
cf3af59e MD |
4687 | exit_kernel: |
4688 | ret = pthread_join(apps_thread, &status); | |
4689 | if (ret != 0) { | |
76d7553f | 4690 | PERROR("pthread_join"); |
cf3af59e MD |
4691 | goto error; /* join error, exit without cleanup */ |
4692 | } | |
fac6795d | 4693 | |
cf3af59e | 4694 | exit_apps: |
099e26bd DG |
4695 | ret = pthread_join(reg_apps_thread, &status); |
4696 | if (ret != 0) { | |
76d7553f | 4697 | PERROR("pthread_join"); |
099e26bd DG |
4698 | goto error; /* join error, exit without cleanup */ |
4699 | } | |
4700 | ||
4701 | exit_reg_apps: | |
4702 | ret = pthread_join(dispatch_thread, &status); | |
4703 | if (ret != 0) { | |
76d7553f | 4704 | PERROR("pthread_join"); |
099e26bd DG |
4705 | goto error; /* join error, exit without cleanup */ |
4706 | } | |
4707 | ||
4708 | exit_dispatch: | |
cf3af59e MD |
4709 | ret = pthread_join(client_thread, &status); |
4710 | if (ret != 0) { | |
76d7553f | 4711 | PERROR("pthread_join"); |
cf3af59e MD |
4712 | goto error; /* join error, exit without cleanup */ |
4713 | } | |
4714 | ||
3bd1e081 | 4715 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4716 | if (ret != 0) { |
76d7553f | 4717 | PERROR("join_consumer"); |
cf3af59e MD |
4718 | goto error; /* join error, exit without cleanup */ |
4719 | } | |
a88df331 | 4720 | |
cf3af59e | 4721 | exit_client: |
a88df331 | 4722 | exit: |
cf3af59e MD |
4723 | /* |
4724 | * cleanup() is called when no other thread is running. | |
4725 | */ | |
f6a9efaa | 4726 | rcu_thread_online(); |
cf3af59e | 4727 | cleanup(); |
f6a9efaa DG |
4728 | rcu_thread_offline(); |
4729 | rcu_unregister_thread(); | |
67e40797 | 4730 | if (!ret) { |
cf3af59e | 4731 | exit(EXIT_SUCCESS); |
67e40797 | 4732 | } |
cf3af59e | 4733 | error: |
5e16da05 | 4734 | exit(EXIT_FAILURE); |
fac6795d | 4735 | } |