Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
3bd1e081 | 41 | #include <lttng-consumerd.h> |
e88129fc | 42 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 43 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 44 | |
1e307fab | 45 | #include <lttngerr.h> |
fac6795d | 46 | |
54d01ffb | 47 | #include "channel.h" |
5eb91c98 | 48 | #include "compat/poll.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
f6a9efaa | 52 | #include "hashtable.h" |
20fe2104 | 53 | #include "kernel-ctl.h" |
32258573 | 54 | #include "lttng-sessiond.h" |
0fdd1e2c | 55 | #include "shm.h" |
56fff090 | 56 | #include "ust-app.h" |
1e307fab | 57 | #include "ust-ctl.h" |
8e68d1c8 | 58 | #include "utils.h" |
fac6795d | 59 | |
3bd1e081 MD |
60 | struct consumer_data { |
61 | enum lttng_consumer_type type; | |
62 | ||
63 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
64 | sem_t sem; | |
65 | ||
66 | /* Mutex to control consumerd pid assignation */ | |
67 | pthread_mutex_t pid_mutex; | |
68 | pid_t pid; | |
69 | ||
70 | int err_sock; | |
71 | int cmd_sock; | |
72 | ||
73 | /* consumer error and command Unix socket path */ | |
74 | char err_unix_sock_path[PATH_MAX]; | |
75 | char cmd_unix_sock_path[PATH_MAX]; | |
76 | }; | |
77 | ||
75462a81 | 78 | /* Const values */ |
686204ab | 79 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 80 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
81 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
82 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
83 | ||
fac6795d | 84 | /* Variables */ |
1d4b027a | 85 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 86 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 87 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 88 | |
fac6795d DG |
89 | const char *progname; |
90 | const char *opt_tracing_group; | |
5b8719f5 | 91 | static int opt_sig_parent; |
fac6795d DG |
92 | static int opt_daemon; |
93 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a | 94 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
3bd1e081 MD |
95 | |
96 | /* Consumer daemon specific control data */ | |
97 | static struct consumer_data kconsumer_data = { | |
98 | .type = LTTNG_CONSUMER_KERNEL, | |
99 | }; | |
100 | static struct consumer_data ustconsumer_data = { | |
101 | .type = LTTNG_CONSUMER_UST, | |
102 | }; | |
103 | ||
099e26bd | 104 | static int dispatch_thread_exit; |
fac6795d | 105 | |
54d01ffb DG |
106 | /* Global application Unix socket path */ |
107 | static char apps_unix_sock_path[PATH_MAX]; | |
108 | /* Global client Unix socket path */ | |
109 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
110 | /* global wait shm path for UST */ |
111 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 112 | |
1d4b027a | 113 | /* Sockets and FDs */ |
d6f42150 DG |
114 | static int client_sock; |
115 | static int apps_sock; | |
20fe2104 | 116 | static int kernel_tracer_fd; |
7a485870 | 117 | static int kernel_poll_pipe[2]; |
1d4b027a | 118 | |
273ea72c DG |
119 | /* |
120 | * Quit pipe for all threads. This permits a single cancellation point | |
121 | * for all threads when receiving an event on the pipe. | |
122 | */ | |
123 | static int thread_quit_pipe[2]; | |
124 | ||
099e26bd DG |
125 | /* |
126 | * This pipe is used to inform the thread managing application communication | |
127 | * that a command is queued and ready to be processed. | |
128 | */ | |
129 | static int apps_cmd_pipe[2]; | |
130 | ||
1d4b027a | 131 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 132 | static pthread_t apps_thread; |
099e26bd | 133 | static pthread_t reg_apps_thread; |
1d4b027a | 134 | static pthread_t client_thread; |
7a485870 | 135 | static pthread_t kernel_thread; |
099e26bd | 136 | static pthread_t dispatch_thread; |
5eb91c98 | 137 | |
fac6795d | 138 | |
099e26bd DG |
139 | /* |
140 | * UST registration command queue. This queue is tied with a futex and uses a N | |
141 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
142 | * | |
143 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
144 | * this queue and the wait/wake scheme. | |
145 | */ | |
146 | static struct ust_cmd_queue ust_cmd_queue; | |
147 | ||
b5541356 DG |
148 | /* |
149 | * Pointer initialized before thread creation. | |
150 | * | |
151 | * This points to the tracing session list containing the session count and a | |
152 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
153 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 154 | * |
d063d709 | 155 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 156 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
157 | */ |
158 | static struct ltt_session_list *session_list_ptr; | |
159 | ||
ba5d816e MD |
160 | int ust_consumer_fd; |
161 | ||
5eb91c98 DG |
162 | /* |
163 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
164 | */ | |
165 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
166 | unsigned int size) | |
167 | { | |
168 | int ret; | |
169 | ||
170 | if (events == NULL || size == 0) { | |
171 | ret = -1; | |
172 | goto error; | |
173 | } | |
174 | ||
175 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
176 | if (ret < 0) { | |
177 | goto error; | |
178 | } | |
179 | ||
180 | /* Add quit pipe */ | |
181 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
182 | if (ret < 0) { | |
183 | goto error; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | ||
188 | error: | |
189 | return ret; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Check if the thread quit pipe was triggered. | |
194 | * | |
195 | * Return 1 if it was triggered else 0; | |
196 | */ | |
197 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
198 | { | |
199 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
200 | return 1; | |
201 | } | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
0fdd1e2c DG |
206 | /* |
207 | * Remove modules in reverse load order. | |
208 | */ | |
209 | static int modprobe_remove_kernel_modules(void) | |
210 | { | |
211 | int ret = 0, i; | |
212 | char modprobe[256]; | |
213 | ||
214 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
215 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 216 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
217 | kernel_modules_list[i].name); |
218 | if (ret < 0) { | |
24b487b8 | 219 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
220 | goto error; |
221 | } | |
222 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
223 | ret = system(modprobe); | |
224 | if (ret == -1) { | |
24b487b8 | 225 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
226 | kernel_modules_list[i].name); |
227 | } else if (kernel_modules_list[i].required | |
228 | && WEXITSTATUS(ret) != 0) { | |
229 | ERR("Unable to remove module %s", | |
230 | kernel_modules_list[i].name); | |
231 | } else { | |
232 | DBG("Modprobe removal successful %s", | |
233 | kernel_modules_list[i].name); | |
234 | } | |
235 | } | |
236 | ||
237 | error: | |
238 | return ret; | |
239 | } | |
240 | ||
241 | /* | |
242 | * Return group ID of the tracing group or -1 if not found. | |
243 | */ | |
996b65c8 MD |
244 | static gid_t allowed_group(void) |
245 | { | |
246 | struct group *grp; | |
247 | ||
274e143b MD |
248 | if (opt_tracing_group) { |
249 | grp = getgrnam(opt_tracing_group); | |
250 | } else { | |
251 | grp = getgrnam(default_tracing_group); | |
252 | } | |
996b65c8 MD |
253 | if (!grp) { |
254 | return -1; | |
255 | } else { | |
256 | return grp->gr_gid; | |
257 | } | |
258 | } | |
259 | ||
273ea72c | 260 | /* |
5eb91c98 | 261 | * Init thread quit pipe. |
273ea72c DG |
262 | * |
263 | * Return -1 on error or 0 if all pipes are created. | |
264 | */ | |
265 | static int init_thread_quit_pipe(void) | |
266 | { | |
267 | int ret; | |
268 | ||
269 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
270 | if (ret < 0) { | |
271 | perror("thread quit pipe"); | |
272 | goto error; | |
273 | } | |
274 | ||
275 | error: | |
276 | return ret; | |
277 | } | |
278 | ||
fac6795d | 279 | /* |
d063d709 DG |
280 | * Complete teardown of a kernel session. This free all data structure related |
281 | * to a kernel session and update counter. | |
fac6795d | 282 | */ |
1d4b027a | 283 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 284 | { |
1d4b027a DG |
285 | if (session->kernel_session != NULL) { |
286 | DBG("Tearing down kernel session"); | |
d9800920 DG |
287 | |
288 | /* | |
289 | * If a custom kernel consumer was registered, close the socket before | |
290 | * tearing down the complete kernel session structure | |
291 | */ | |
3bd1e081 | 292 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { |
d9800920 DG |
293 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
294 | } | |
295 | ||
62499ad6 | 296 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
297 | /* Extra precaution */ |
298 | session->kernel_session = NULL; | |
fac6795d | 299 | } |
fac6795d DG |
300 | } |
301 | ||
f6a9efaa DG |
302 | /* |
303 | * Complete teardown of all UST sessions. This will free everything on his path | |
304 | * and destroy the core essence of all ust sessions :) | |
305 | */ | |
306 | static void teardown_ust_session(struct ltt_session *session) | |
307 | { | |
308 | DBG("Tearing down UST session(s)"); | |
309 | ||
310 | trace_ust_destroy_session(session->ust_session); | |
311 | } | |
312 | ||
099e26bd DG |
313 | /* |
314 | * Stop all threads by closing the thread quit pipe. | |
315 | */ | |
cf3af59e MD |
316 | static void stop_threads(void) |
317 | { | |
5eb91c98 DG |
318 | int ret; |
319 | ||
cf3af59e MD |
320 | /* Stopping all threads */ |
321 | DBG("Terminating all threads"); | |
54d01ffb | 322 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
323 | if (ret < 0) { |
324 | ERR("write error on thread quit pipe"); | |
325 | } | |
326 | ||
099e26bd DG |
327 | /* Dispatch thread */ |
328 | dispatch_thread_exit = 1; | |
329 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
330 | } |
331 | ||
fac6795d | 332 | /* |
d063d709 | 333 | * Cleanup the daemon |
fac6795d | 334 | */ |
cf3af59e | 335 | static void cleanup(void) |
fac6795d | 336 | { |
1d4b027a DG |
337 | int ret; |
338 | char *cmd; | |
af9737e9 | 339 | struct ltt_session *sess, *stmp; |
fac6795d | 340 | |
1d4b027a | 341 | DBG("Cleaning up"); |
e07ae692 | 342 | |
5eb91c98 DG |
343 | if (is_root) { |
344 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
345 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
346 | if (ret < 0) { | |
347 | ERR("asprintf failed. Something is really wrong!"); | |
348 | } | |
5461b305 | 349 | |
5eb91c98 DG |
350 | /* Remove lttng run directory */ |
351 | ret = system(cmd); | |
352 | if (ret < 0) { | |
353 | ERR("Unable to clean " LTTNG_RUNDIR); | |
354 | } | |
1d4b027a | 355 | } |
5461b305 | 356 | |
1d4b027a | 357 | DBG("Cleaning up all session"); |
fac6795d | 358 | |
b5541356 | 359 | /* Destroy session list mutex */ |
273ea72c DG |
360 | if (session_list_ptr != NULL) { |
361 | pthread_mutex_destroy(&session_list_ptr->lock); | |
362 | ||
363 | /* Cleanup ALL session */ | |
54d01ffb DG |
364 | cds_list_for_each_entry_safe(sess, stmp, |
365 | &session_list_ptr->head, list) { | |
273ea72c | 366 | teardown_kernel_session(sess); |
f6a9efaa DG |
367 | teardown_ust_session(sess); |
368 | free(sess); | |
273ea72c DG |
369 | } |
370 | } | |
371 | ||
099e26bd | 372 | DBG("Closing all UST sockets"); |
56fff090 | 373 | ust_app_clean_list(); |
099e26bd | 374 | |
3bd1e081 | 375 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 376 | |
f3ed775e | 377 | DBG("Closing kernel fd"); |
1d4b027a | 378 | close(kernel_tracer_fd); |
ab147185 | 379 | |
2f50c8a3 DG |
380 | if (is_root) { |
381 | DBG("Unloading kernel modules"); | |
382 | modprobe_remove_kernel_modules(); | |
383 | } | |
5eb91c98 DG |
384 | |
385 | close(thread_quit_pipe[0]); | |
386 | close(thread_quit_pipe[1]); | |
421cb601 DG |
387 | |
388 | /* <fun> */ | |
389 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
390 | "Matthew, BEET driven development works!%c[%dm", | |
391 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
392 | /* </fun> */ | |
fac6795d DG |
393 | } |
394 | ||
e065084a | 395 | /* |
d063d709 | 396 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 397 | * |
d063d709 | 398 | * Return lttcomm error code. |
e065084a DG |
399 | */ |
400 | static int send_unix_sock(int sock, void *buf, size_t len) | |
401 | { | |
402 | /* Check valid length */ | |
403 | if (len <= 0) { | |
404 | return -1; | |
405 | } | |
406 | ||
407 | return lttcomm_send_unix_sock(sock, buf, len); | |
408 | } | |
409 | ||
5461b305 | 410 | /* |
d063d709 | 411 | * Free memory of a command context structure. |
5461b305 | 412 | */ |
a2fb29a5 | 413 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 414 | { |
a2fb29a5 DG |
415 | DBG("Clean command context structure"); |
416 | if (*cmd_ctx) { | |
417 | if ((*cmd_ctx)->llm) { | |
418 | free((*cmd_ctx)->llm); | |
5461b305 | 419 | } |
a2fb29a5 DG |
420 | if ((*cmd_ctx)->lsm) { |
421 | free((*cmd_ctx)->lsm); | |
5461b305 | 422 | } |
a2fb29a5 DG |
423 | free(*cmd_ctx); |
424 | *cmd_ctx = NULL; | |
5461b305 DG |
425 | } |
426 | } | |
427 | ||
f3ed775e | 428 | /* |
d063d709 | 429 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 430 | */ |
2bdd86d4 | 431 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 432 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
433 | { |
434 | int ret; | |
f3ed775e | 435 | struct ltt_kernel_stream *stream; |
3bd1e081 | 436 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 437 | |
3bd1e081 | 438 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 439 | channel->channel->name); |
f3ed775e | 440 | |
3bd1e081 MD |
441 | /* Send channel */ |
442 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
443 | lkm.u.channel.channel_key = channel->fd; | |
444 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
445 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 446 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 447 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 448 | if (ret < 0) { |
3bd1e081 | 449 | perror("send consumer channel"); |
f3ed775e DG |
450 | goto error; |
451 | } | |
452 | ||
3bd1e081 | 453 | /* Send streams */ |
7a485870 | 454 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
455 | if (!stream->fd) { |
456 | continue; | |
457 | } | |
458 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
459 | lkm.u.stream.channel_key = channel->fd; | |
460 | lkm.u.stream.stream_key = stream->fd; | |
461 | lkm.u.stream.state = stream->state; | |
462 | lkm.u.stream.output = channel->channel->attr.output; | |
463 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
464 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
465 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
466 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
467 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
468 | if (ret < 0) { | |
469 | perror("send consumer stream"); | |
470 | goto error; | |
471 | } | |
472 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
473 | if (ret < 0) { | |
474 | perror("send consumer stream ancillary data"); | |
475 | goto error; | |
f3ed775e DG |
476 | } |
477 | } | |
478 | ||
3bd1e081 | 479 | DBG("consumer channel streams sent"); |
f3ed775e DG |
480 | |
481 | return 0; | |
482 | ||
483 | error: | |
484 | return ret; | |
485 | } | |
486 | ||
487 | /* | |
d063d709 | 488 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 489 | */ |
2bdd86d4 | 490 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 491 | struct ltt_kernel_session *session) |
f3ed775e DG |
492 | { |
493 | int ret; | |
494 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
495 | struct lttcomm_consumer_msg lkm; |
496 | int sock = session->consumer_fd; | |
7a485870 DG |
497 | |
498 | DBG("Sending metadata stream fd"); | |
499 | ||
2bdd86d4 | 500 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 501 | if (session->consumer_fd == 0) { |
3bd1e081 | 502 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
503 | } |
504 | ||
7a485870 | 505 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
506 | /* Send metadata channel fd */ |
507 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
508 | lkm.u.channel.channel_key = session->metadata->fd; | |
509 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
510 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
511 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
512 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
513 | if (ret < 0) { | |
514 | perror("send consumer channel"); | |
515 | goto error; | |
516 | } | |
517 | ||
518 | /* Send metadata stream fd */ | |
519 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
520 | lkm.u.stream.channel_key = session->metadata->fd; | |
521 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
522 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
523 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
524 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
525 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
526 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
527 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
528 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
529 | if (ret < 0) { | |
530 | perror("send consumer stream"); | |
531 | goto error; | |
532 | } | |
533 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 534 | if (ret < 0) { |
3bd1e081 | 535 | perror("send consumer stream"); |
7a485870 DG |
536 | goto error; |
537 | } | |
538 | } | |
f3ed775e | 539 | |
f3ed775e | 540 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 MD |
541 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
542 | if (ret < 0) { | |
543 | goto error; | |
544 | } | |
545 | } | |
546 | ||
547 | DBG("consumer fds (metadata and channel streams) sent"); | |
548 | ||
549 | return 0; | |
550 | ||
551 | error: | |
552 | return ret; | |
553 | } | |
554 | ||
fac6795d | 555 | /* |
0fdd1e2c | 556 | * Notify UST applications using the shm mmap futex. |
fac6795d | 557 | */ |
0fdd1e2c | 558 | static int notify_ust_apps(int active) |
fac6795d | 559 | { |
0fdd1e2c | 560 | char *wait_shm_mmap; |
fac6795d | 561 | |
0fdd1e2c | 562 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 563 | |
0fdd1e2c DG |
564 | /* See shm.c for this call implying mmap, shm and futex calls */ |
565 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
566 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
567 | goto error; |
568 | } | |
569 | ||
0fdd1e2c DG |
570 | /* Wake waiting process */ |
571 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
572 | ||
573 | /* Apps notified successfully */ | |
574 | return 0; | |
fac6795d DG |
575 | |
576 | error: | |
0fdd1e2c | 577 | return -1; |
fac6795d DG |
578 | } |
579 | ||
e065084a | 580 | /* |
d063d709 DG |
581 | * Setup the outgoing data buffer for the response (llm) by allocating the |
582 | * right amount of memory and copying the original information from the lsm | |
583 | * structure. | |
ca95a216 | 584 | * |
d063d709 | 585 | * Return total size of the buffer pointed by buf. |
ca95a216 | 586 | */ |
5461b305 | 587 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 588 | { |
f3ed775e | 589 | int ret, buf_size; |
ca95a216 | 590 | |
f3ed775e | 591 | buf_size = size; |
5461b305 | 592 | |
ba7f0ae5 | 593 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 594 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 595 | perror("zmalloc"); |
5461b305 | 596 | ret = -ENOMEM; |
ca95a216 DG |
597 | goto error; |
598 | } | |
599 | ||
5461b305 DG |
600 | /* Copy common data */ |
601 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 602 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 603 | |
5461b305 DG |
604 | cmd_ctx->llm->data_size = size; |
605 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
606 | ||
ca95a216 DG |
607 | return buf_size; |
608 | ||
609 | error: | |
610 | return ret; | |
611 | } | |
612 | ||
7a485870 | 613 | /* |
5eb91c98 | 614 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 615 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 616 | */ |
5eb91c98 | 617 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 618 | { |
5eb91c98 | 619 | int ret; |
7a485870 DG |
620 | struct ltt_session *session; |
621 | struct ltt_kernel_channel *channel; | |
622 | ||
5eb91c98 | 623 | DBG("Updating kernel poll set"); |
7a485870 | 624 | |
54d01ffb | 625 | session_lock_list(); |
b5541356 | 626 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 627 | session_lock(session); |
7a485870 | 628 | if (session->kernel_session == NULL) { |
54d01ffb | 629 | session_unlock(session); |
7a485870 DG |
630 | continue; |
631 | } | |
7a485870 | 632 | |
54d01ffb DG |
633 | cds_list_for_each_entry(channel, |
634 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
635 | /* Add channel fd to the kernel poll set */ |
636 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
637 | if (ret < 0) { | |
54d01ffb | 638 | session_unlock(session); |
5eb91c98 DG |
639 | goto error; |
640 | } | |
641 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 642 | } |
54d01ffb | 643 | session_unlock(session); |
7a485870 | 644 | } |
54d01ffb | 645 | session_unlock_list(); |
7a485870 | 646 | |
5eb91c98 | 647 | return 0; |
7a485870 DG |
648 | |
649 | error: | |
54d01ffb | 650 | session_unlock_list(); |
7a485870 DG |
651 | return -1; |
652 | } | |
653 | ||
654 | /* | |
54d01ffb | 655 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 656 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 657 | * |
d063d709 | 658 | * Useful for CPU hotplug feature. |
7a485870 | 659 | */ |
2bdd86d4 | 660 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
661 | { |
662 | int ret = 0; | |
663 | struct ltt_session *session; | |
664 | struct ltt_kernel_channel *channel; | |
665 | ||
666 | DBG("Updating kernel streams for channel fd %d", fd); | |
667 | ||
54d01ffb | 668 | session_lock_list(); |
b5541356 | 669 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 670 | session_lock(session); |
7a485870 | 671 | if (session->kernel_session == NULL) { |
54d01ffb | 672 | session_unlock(session); |
7a485870 DG |
673 | continue; |
674 | } | |
d9800920 DG |
675 | |
676 | /* This is not suppose to be 0 but this is an extra security check */ | |
677 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 678 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
679 | } |
680 | ||
5eb91c98 DG |
681 | cds_list_for_each_entry(channel, |
682 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
683 | if (channel->fd == fd) { |
684 | DBG("Channel found, updating kernel streams"); | |
685 | ret = kernel_open_channel_stream(channel); | |
686 | if (ret < 0) { | |
b3c750d2 | 687 | goto error; |
7a485870 | 688 | } |
d9800920 | 689 | |
7a485870 | 690 | /* |
5eb91c98 DG |
691 | * Have we already sent fds to the consumer? If yes, it means |
692 | * that tracing is started so it is safe to send our updated | |
693 | * stream fds. | |
7a485870 | 694 | */ |
3bd1e081 | 695 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 696 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 697 | session->kernel_session->consumer_fd, channel); |
7a485870 | 698 | if (ret < 0) { |
b3c750d2 | 699 | goto error; |
7a485870 DG |
700 | } |
701 | } | |
b3c750d2 | 702 | goto error; |
7a485870 DG |
703 | } |
704 | } | |
54d01ffb | 705 | session_unlock(session); |
7a485870 | 706 | } |
54d01ffb | 707 | session_unlock_list(); |
b3c750d2 | 708 | return ret; |
7a485870 | 709 | |
b3c750d2 | 710 | error: |
54d01ffb DG |
711 | session_unlock(session); |
712 | session_unlock_list(); | |
7a485870 DG |
713 | return ret; |
714 | } | |
715 | ||
487cf67c DG |
716 | /* |
717 | * For each tracing session, update newly registered apps. | |
718 | */ | |
719 | static void update_ust_app(int app_sock) | |
720 | { | |
721 | struct ltt_session *sess, *stmp; | |
722 | ||
723 | /* For all tracing session(s) */ | |
724 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
725 | if (sess->ust_session) { |
726 | ust_app_global_update(sess->ust_session, app_sock); | |
727 | } | |
487cf67c DG |
728 | } |
729 | } | |
730 | ||
7a485870 | 731 | /* |
d063d709 | 732 | * This thread manage event coming from the kernel. |
7a485870 | 733 | * |
d063d709 DG |
734 | * Features supported in this thread: |
735 | * -) CPU Hotplug | |
7a485870 DG |
736 | */ |
737 | static void *thread_manage_kernel(void *data) | |
738 | { | |
5eb91c98 DG |
739 | int ret, i, pollfd, update_poll_flag = 1; |
740 | uint32_t revents, nb_fd; | |
7a485870 | 741 | char tmp; |
5eb91c98 | 742 | struct lttng_poll_event events; |
7a485870 DG |
743 | |
744 | DBG("Thread manage kernel started"); | |
745 | ||
5eb91c98 DG |
746 | ret = create_thread_poll_set(&events, 2); |
747 | if (ret < 0) { | |
748 | goto error; | |
749 | } | |
750 | ||
751 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
752 | if (ret < 0) { | |
753 | goto error; | |
754 | } | |
755 | ||
7a485870 DG |
756 | while (1) { |
757 | if (update_poll_flag == 1) { | |
5f822d0a DG |
758 | /* |
759 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
760 | * quit pipe and the kernel pipe. | |
761 | */ | |
762 | events.nb_fd = 2; | |
763 | ||
5eb91c98 DG |
764 | ret = update_kernel_poll(&events); |
765 | if (ret < 0) { | |
7a485870 DG |
766 | goto error; |
767 | } | |
768 | update_poll_flag = 0; | |
769 | } | |
770 | ||
5eb91c98 DG |
771 | nb_fd = LTTNG_POLL_GETNB(&events); |
772 | ||
773 | DBG("Thread kernel polling on %d fds", nb_fd); | |
774 | ||
775 | /* Zeroed the poll events */ | |
776 | lttng_poll_reset(&events); | |
7a485870 DG |
777 | |
778 | /* Poll infinite value of time */ | |
5eb91c98 | 779 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 780 | if (ret < 0) { |
7a485870 DG |
781 | goto error; |
782 | } else if (ret == 0) { | |
783 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
784 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
785 | "This should not have happened! Continuing..."); | |
7a485870 DG |
786 | continue; |
787 | } | |
788 | ||
5eb91c98 DG |
789 | for (i = 0; i < nb_fd; i++) { |
790 | /* Fetch once the poll data */ | |
791 | revents = LTTNG_POLL_GETEV(&events, i); | |
792 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 793 | |
5eb91c98 DG |
794 | /* Thread quit pipe has been closed. Killing thread. */ |
795 | ret = check_thread_quit_pipe(pollfd, revents); | |
796 | if (ret) { | |
797 | goto error; | |
798 | } | |
7a485870 | 799 | |
5eb91c98 DG |
800 | /* Check for data on kernel pipe */ |
801 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
802 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
803 | update_poll_flag = 1; | |
804 | continue; | |
805 | } else { | |
806 | /* | |
807 | * New CPU detected by the kernel. Adding kernel stream to | |
808 | * kernel session and updating the kernel consumer | |
809 | */ | |
810 | if (revents & LPOLLIN) { | |
2bdd86d4 | 811 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
812 | if (ret < 0) { |
813 | continue; | |
814 | } | |
815 | break; | |
816 | /* | |
817 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
818 | * and unregister kernel stream at this point. | |
819 | */ | |
7a485870 | 820 | } |
7a485870 DG |
821 | } |
822 | } | |
823 | } | |
824 | ||
825 | error: | |
826 | DBG("Kernel thread dying"); | |
273ea72c DG |
827 | close(kernel_poll_pipe[0]); |
828 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
829 | |
830 | lttng_poll_clean(&events); | |
831 | ||
7a485870 DG |
832 | return NULL; |
833 | } | |
834 | ||
1d4b027a | 835 | /* |
3bd1e081 | 836 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 837 | */ |
3bd1e081 | 838 | static void *thread_manage_consumer(void *data) |
1d4b027a | 839 | { |
5eb91c98 DG |
840 | int sock = 0, i, ret, pollfd; |
841 | uint32_t revents, nb_fd; | |
1d4b027a | 842 | enum lttcomm_return_code code; |
5eb91c98 | 843 | struct lttng_poll_event events; |
3bd1e081 | 844 | struct consumer_data *consumer_data = data; |
1d4b027a | 845 | |
3bd1e081 | 846 | DBG("[thread] Manage consumer started"); |
1d4b027a | 847 | |
3bd1e081 | 848 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
849 | if (ret < 0) { |
850 | goto error; | |
851 | } | |
852 | ||
5eb91c98 DG |
853 | /* |
854 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
855 | * Nothing more will be added to this poll set. | |
856 | */ | |
857 | ret = create_thread_poll_set(&events, 2); | |
858 | if (ret < 0) { | |
859 | goto error; | |
860 | } | |
273ea72c | 861 | |
3bd1e081 | 862 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
863 | if (ret < 0) { |
864 | goto error; | |
865 | } | |
866 | ||
867 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
868 | |
869 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 870 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 871 | if (ret < 0) { |
273ea72c DG |
872 | goto error; |
873 | } | |
874 | ||
5eb91c98 DG |
875 | for (i = 0; i < nb_fd; i++) { |
876 | /* Fetch once the poll data */ | |
877 | revents = LTTNG_POLL_GETEV(&events, i); | |
878 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
879 | ||
880 | /* Thread quit pipe has been closed. Killing thread. */ | |
881 | ret = check_thread_quit_pipe(pollfd, revents); | |
882 | if (ret) { | |
883 | goto error; | |
884 | } | |
885 | ||
886 | /* Event on the registration socket */ | |
3bd1e081 | 887 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 888 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 889 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
890 | goto error; |
891 | } | |
892 | } | |
273ea72c DG |
893 | } |
894 | ||
3bd1e081 | 895 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
896 | if (sock < 0) { |
897 | goto error; | |
898 | } | |
899 | ||
3bd1e081 | 900 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 901 | |
712ea556 | 902 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
903 | ret = lttcomm_recv_unix_sock(sock, &code, |
904 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
905 | if (ret <= 0) { |
906 | goto error; | |
907 | } | |
908 | ||
3bd1e081 MD |
909 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
910 | consumer_data->cmd_sock = | |
911 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
912 | if (consumer_data->cmd_sock < 0) { | |
913 | sem_post(&consumer_data->sem); | |
48842b30 | 914 | PERROR("consumer connect"); |
1d4b027a DG |
915 | goto error; |
916 | } | |
917 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
918 | sem_post(&consumer_data->sem); |
919 | DBG("consumer command socket ready"); | |
1d4b027a | 920 | } else { |
3bd1e081 | 921 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
922 | lttcomm_get_readable_code(-code)); |
923 | goto error; | |
924 | } | |
925 | ||
54d01ffb | 926 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 927 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 928 | if (ret < 0) { |
72079cae DG |
929 | goto error; |
930 | } | |
931 | ||
5eb91c98 DG |
932 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
933 | if (ret < 0) { | |
72079cae | 934 | goto error; |
5eb91c98 DG |
935 | } |
936 | ||
937 | /* Update number of fd */ | |
938 | nb_fd = LTTNG_POLL_GETNB(&events); | |
939 | ||
940 | /* Inifinite blocking call, waiting for transmission */ | |
941 | ret = lttng_poll_wait(&events, -1); | |
942 | if (ret < 0) { | |
72079cae DG |
943 | goto error; |
944 | } | |
945 | ||
5eb91c98 DG |
946 | for (i = 0; i < nb_fd; i++) { |
947 | /* Fetch once the poll data */ | |
948 | revents = LTTNG_POLL_GETEV(&events, i); | |
949 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
950 | ||
951 | /* Thread quit pipe has been closed. Killing thread. */ | |
952 | ret = check_thread_quit_pipe(pollfd, revents); | |
953 | if (ret) { | |
954 | goto error; | |
955 | } | |
956 | ||
957 | /* Event on the kconsumerd socket */ | |
958 | if (pollfd == sock) { | |
959 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 960 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
961 | goto error; |
962 | } | |
963 | } | |
964 | } | |
965 | ||
712ea556 | 966 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
967 | ret = lttcomm_recv_unix_sock(sock, &code, |
968 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 969 | if (ret <= 0) { |
3bd1e081 | 970 | ERR("consumer closed the command socket"); |
712ea556 | 971 | goto error; |
6f61d021 | 972 | } |
1d4b027a | 973 | |
3bd1e081 | 974 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 975 | |
1d4b027a | 976 | error: |
3bd1e081 MD |
977 | DBG("consumer thread dying"); |
978 | close(consumer_data->err_sock); | |
979 | close(consumer_data->cmd_sock); | |
5eb91c98 | 980 | close(sock); |
273ea72c | 981 | |
3bd1e081 MD |
982 | unlink(consumer_data->err_unix_sock_path); |
983 | unlink(consumer_data->cmd_unix_sock_path); | |
984 | consumer_data->pid = 0; | |
1d4b027a | 985 | |
5eb91c98 | 986 | lttng_poll_clean(&events); |
0177d773 | 987 | |
5eb91c98 | 988 | return NULL; |
099e26bd DG |
989 | } |
990 | ||
099e26bd DG |
991 | /* |
992 | * This thread manage application communication. | |
1d4b027a DG |
993 | */ |
994 | static void *thread_manage_apps(void *data) | |
099e26bd | 995 | { |
5eb91c98 DG |
996 | int i, ret, pollfd; |
997 | uint32_t revents, nb_fd; | |
099e26bd | 998 | struct ust_command ust_cmd; |
5eb91c98 | 999 | struct lttng_poll_event events; |
099e26bd DG |
1000 | |
1001 | DBG("[thread] Manage application started"); | |
1002 | ||
f6a9efaa DG |
1003 | rcu_register_thread(); |
1004 | rcu_thread_online(); | |
1005 | ||
5eb91c98 DG |
1006 | ret = create_thread_poll_set(&events, 2); |
1007 | if (ret < 0) { | |
1008 | goto error; | |
1009 | } | |
099e26bd | 1010 | |
5eb91c98 DG |
1011 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1012 | if (ret < 0) { | |
1013 | goto error; | |
1014 | } | |
099e26bd | 1015 | |
5eb91c98 DG |
1016 | while (1) { |
1017 | /* Zeroed the events structure */ | |
1018 | lttng_poll_reset(&events); | |
0177d773 | 1019 | |
5eb91c98 | 1020 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1021 | |
1022 | DBG("Apps thread polling on %d fds", nb_fd); | |
1023 | ||
1024 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1025 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1026 | if (ret < 0) { |
099e26bd DG |
1027 | goto error; |
1028 | } | |
1029 | ||
5eb91c98 DG |
1030 | for (i = 0; i < nb_fd; i++) { |
1031 | /* Fetch once the poll data */ | |
1032 | revents = LTTNG_POLL_GETEV(&events, i); | |
1033 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1034 | ||
1035 | /* Thread quit pipe has been closed. Killing thread. */ | |
1036 | ret = check_thread_quit_pipe(pollfd, revents); | |
1037 | if (ret) { | |
099e26bd | 1038 | goto error; |
5eb91c98 | 1039 | } |
099e26bd | 1040 | |
5eb91c98 DG |
1041 | /* Inspect the apps cmd pipe */ |
1042 | if (pollfd == apps_cmd_pipe[0]) { | |
1043 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1044 | ERR("Apps command pipe error"); | |
0177d773 | 1045 | goto error; |
5eb91c98 DG |
1046 | } else if (revents & LPOLLIN) { |
1047 | /* Empty pipe */ | |
1048 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1049 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1050 | perror("read apps cmd pipe"); | |
1051 | goto error; | |
1052 | } | |
099e26bd | 1053 | |
5eb91c98 | 1054 | /* Register applicaton to the session daemon */ |
56fff090 | 1055 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1056 | ust_cmd.sock); |
5eb91c98 DG |
1057 | if (ret < 0) { |
1058 | /* Only critical ENOMEM error can be returned here */ | |
1059 | goto error; | |
1060 | } | |
1061 | ||
acc7b41b MD |
1062 | /* |
1063 | * Add channel(s) and event(s) to newly registered apps | |
1064 | * from lttng global UST domain. | |
1065 | */ | |
1066 | update_ust_app(ust_cmd.sock); | |
1067 | ||
5eb91c98 DG |
1068 | ret = ustctl_register_done(ust_cmd.sock); |
1069 | if (ret < 0) { | |
1070 | /* | |
1071 | * If the registration is not possible, we simply | |
1072 | * unregister the apps and continue | |
1073 | */ | |
56fff090 | 1074 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1075 | } else { |
1076 | /* | |
1077 | * We just need here to monitor the close of the UST | |
1078 | * socket and poll set monitor those by default. | |
1079 | */ | |
1080 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1081 | if (ret < 0) { | |
1082 | goto error; | |
1083 | } | |
1084 | ||
54d01ffb DG |
1085 | DBG("Apps with sock %d added to poll set", |
1086 | ust_cmd.sock); | |
5eb91c98 | 1087 | } |
487cf67c | 1088 | |
5eb91c98 | 1089 | break; |
0177d773 | 1090 | } |
5eb91c98 DG |
1091 | } else { |
1092 | /* | |
54d01ffb DG |
1093 | * At this point, we know that a registered application made |
1094 | * the event at poll_wait. | |
5eb91c98 DG |
1095 | */ |
1096 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1097 | /* Removing from the poll set */ | |
1098 | ret = lttng_poll_del(&events, pollfd); | |
1099 | if (ret < 0) { | |
1100 | goto error; | |
1101 | } | |
099e26bd | 1102 | |
b9d9b220 | 1103 | /* Socket closed on remote end. */ |
56fff090 | 1104 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1105 | break; |
1106 | } | |
099e26bd DG |
1107 | } |
1108 | } | |
099e26bd DG |
1109 | } |
1110 | ||
1111 | error: | |
1112 | DBG("Application communication apps dying"); | |
1113 | close(apps_cmd_pipe[0]); | |
1114 | close(apps_cmd_pipe[1]); | |
1115 | ||
5eb91c98 | 1116 | lttng_poll_clean(&events); |
099e26bd | 1117 | |
f6a9efaa DG |
1118 | rcu_thread_offline(); |
1119 | rcu_unregister_thread(); | |
099e26bd DG |
1120 | return NULL; |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * Dispatch request from the registration threads to the application | |
1125 | * communication thread. | |
1126 | */ | |
1127 | static void *thread_dispatch_ust_registration(void *data) | |
1128 | { | |
1129 | int ret; | |
1130 | struct cds_wfq_node *node; | |
1131 | struct ust_command *ust_cmd = NULL; | |
1132 | ||
1133 | DBG("[thread] Dispatch UST command started"); | |
1134 | ||
1135 | while (!dispatch_thread_exit) { | |
1136 | /* Atomically prepare the queue futex */ | |
1137 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1138 | ||
1139 | do { | |
1140 | /* Dequeue command for registration */ | |
1141 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1142 | if (node == NULL) { | |
00a17c97 | 1143 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1144 | /* Continue thread execution */ |
1145 | break; | |
1146 | } | |
1147 | ||
1148 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1149 | ||
2f50c8a3 DG |
1150 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1151 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1152 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1153 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1154 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1155 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1156 | /* |
1157 | * Inform apps thread of the new application registration. This | |
1158 | * call is blocking so we can be assured that the data will be read | |
1159 | * at some point in time or wait to the end of the world :) | |
1160 | */ | |
1161 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1162 | sizeof(struct ust_command)); | |
1163 | if (ret < 0) { | |
1164 | perror("write apps cmd pipe"); | |
1165 | if (errno == EBADF) { | |
1166 | /* | |
1167 | * We can't inform the application thread to process | |
1168 | * registration. We will exit or else application | |
1169 | * registration will not occur and tracing will never | |
1170 | * start. | |
1171 | */ | |
1172 | goto error; | |
1173 | } | |
1174 | } | |
1175 | free(ust_cmd); | |
1176 | } while (node != NULL); | |
1177 | ||
1178 | /* Futex wait on queue. Blocking call on futex() */ | |
1179 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1180 | } | |
1181 | ||
1182 | error: | |
1183 | DBG("Dispatch thread dying"); | |
1184 | return NULL; | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * This thread manage application registration. | |
1189 | */ | |
1190 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1191 | { |
5eb91c98 DG |
1192 | int sock = 0, i, ret, pollfd; |
1193 | uint32_t revents, nb_fd; | |
1194 | struct lttng_poll_event events; | |
099e26bd DG |
1195 | /* |
1196 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1197 | * freed in the manage apps thread. | |
1198 | */ | |
1199 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1200 | |
099e26bd | 1201 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1202 | |
1203 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1204 | if (ret < 0) { | |
1205 | goto error; | |
1206 | } | |
1207 | ||
5eb91c98 DG |
1208 | /* |
1209 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1210 | * more will be added to this poll set. | |
1211 | */ | |
1212 | ret = create_thread_poll_set(&events, 2); | |
1213 | if (ret < 0) { | |
1214 | goto error; | |
1215 | } | |
273ea72c | 1216 | |
5eb91c98 DG |
1217 | /* Add the application registration socket */ |
1218 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1219 | if (ret < 0) { | |
1220 | goto error; | |
1221 | } | |
273ea72c | 1222 | |
1d4b027a | 1223 | /* Notify all applications to register */ |
0fdd1e2c DG |
1224 | ret = notify_ust_apps(1); |
1225 | if (ret < 0) { | |
1226 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1227 | "Execution continues but there might be problem for already\n" |
1228 | "running applications that wishes to register."); | |
0fdd1e2c | 1229 | } |
1d4b027a DG |
1230 | |
1231 | while (1) { | |
1232 | DBG("Accepting application registration"); | |
273ea72c | 1233 | |
5eb91c98 DG |
1234 | nb_fd = LTTNG_POLL_GETNB(&events); |
1235 | ||
273ea72c | 1236 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1237 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1238 | if (ret < 0) { |
273ea72c DG |
1239 | goto error; |
1240 | } | |
1241 | ||
5eb91c98 DG |
1242 | for (i = 0; i < nb_fd; i++) { |
1243 | /* Fetch once the poll data */ | |
1244 | revents = LTTNG_POLL_GETEV(&events, i); | |
1245 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1246 | |
5eb91c98 DG |
1247 | /* Thread quit pipe has been closed. Killing thread. */ |
1248 | ret = check_thread_quit_pipe(pollfd, revents); | |
1249 | if (ret) { | |
90014c57 DG |
1250 | goto error; |
1251 | } | |
1d4b027a | 1252 | |
5eb91c98 DG |
1253 | /* Event on the registration socket */ |
1254 | if (pollfd == apps_sock) { | |
1255 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1256 | ERR("Register apps socket poll error"); | |
1257 | goto error; | |
1258 | } else if (revents & LPOLLIN) { | |
1259 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1260 | if (sock < 0) { | |
1261 | goto error; | |
1262 | } | |
099e26bd | 1263 | |
5eb91c98 | 1264 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1265 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1266 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1267 | perror("ust command zmalloc"); |
5eb91c98 DG |
1268 | goto error; |
1269 | } | |
1d4b027a | 1270 | |
5eb91c98 DG |
1271 | /* |
1272 | * Using message-based transmissions to ensure we don't | |
1273 | * have to deal with partially received messages. | |
1274 | */ | |
1275 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1276 | sizeof(struct ust_register_msg)); | |
1277 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1278 | if (ret < 0) { | |
1279 | perror("lttcomm_recv_unix_sock register apps"); | |
1280 | } else { | |
1281 | ERR("Wrong size received on apps register"); | |
1282 | } | |
1283 | free(ust_cmd); | |
1284 | close(sock); | |
1285 | continue; | |
1286 | } | |
099e26bd | 1287 | |
5eb91c98 | 1288 | ust_cmd->sock = sock; |
099e26bd | 1289 | |
5eb91c98 DG |
1290 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1291 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1292 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1293 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1294 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1295 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1296 | |
5eb91c98 DG |
1297 | /* |
1298 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1299 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1300 | */ |
1301 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1302 | ||
1303 | /* | |
1304 | * Wake the registration queue futex. Implicit memory | |
1305 | * barrier with the exchange in cds_wfq_enqueue. | |
1306 | */ | |
1307 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1308 | } | |
1309 | } | |
90014c57 | 1310 | } |
1d4b027a DG |
1311 | } |
1312 | ||
1313 | error: | |
0fdd1e2c DG |
1314 | DBG("UST Registration thread dying"); |
1315 | ||
1316 | /* Notify that the registration thread is gone */ | |
1317 | notify_ust_apps(0); | |
1318 | ||
1319 | close(apps_sock); | |
1320 | close(sock); | |
273ea72c | 1321 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1322 | |
5eb91c98 DG |
1323 | lttng_poll_clean(&events); |
1324 | ||
1d4b027a DG |
1325 | return NULL; |
1326 | } | |
1327 | ||
8c0faa1d | 1328 | /* |
3bd1e081 | 1329 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1330 | * exec or it will fails. |
8c0faa1d | 1331 | */ |
3bd1e081 | 1332 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1333 | { |
1334 | int ret; | |
ee0b0061 DG |
1335 | struct timespec timeout; |
1336 | ||
1337 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1338 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1339 | |
1340 | /* Setup semaphore */ | |
3bd1e081 | 1341 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1342 | if (ret < 0) { |
3bd1e081 | 1343 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1344 | goto error; |
1345 | } | |
8c0faa1d | 1346 | |
3bd1e081 MD |
1347 | ret = pthread_create(&consumer_data->thread, NULL, |
1348 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1349 | if (ret != 0) { |
3bd1e081 | 1350 | PERROR("pthread_create consumer"); |
ee0b0061 | 1351 | ret = -1; |
8c0faa1d DG |
1352 | goto error; |
1353 | } | |
1354 | ||
ee0b0061 DG |
1355 | /* Get time for sem_timedwait absolute timeout */ |
1356 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1357 | if (ret < 0) { | |
3bd1e081 | 1358 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1359 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1360 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1361 | } else { |
1362 | /* Normal timeout if the gettime was successful */ | |
1363 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1364 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1365 | } |
8c0faa1d | 1366 | |
ee0b0061 DG |
1367 | if (ret < 0) { |
1368 | if (errno == ETIMEDOUT) { | |
1369 | /* | |
1370 | * Call has timed out so we kill the kconsumerd_thread and return | |
1371 | * an error. | |
1372 | */ | |
3bd1e081 MD |
1373 | ERR("The consumer thread was never ready. Killing it"); |
1374 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1375 | if (ret < 0) { |
3bd1e081 | 1376 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1377 | } |
1378 | } else { | |
3bd1e081 | 1379 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1380 | } |
1381 | goto error; | |
1382 | } | |
1383 | ||
3bd1e081 MD |
1384 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1385 | if (consumer_data->pid == 0) { | |
712ea556 | 1386 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1387 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1388 | goto error; |
1389 | } | |
3bd1e081 | 1390 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1391 | |
8c0faa1d DG |
1392 | return 0; |
1393 | ||
1394 | error: | |
1395 | return ret; | |
1396 | } | |
1397 | ||
d9800920 | 1398 | /* |
3bd1e081 | 1399 | * Join consumer thread |
d9800920 | 1400 | */ |
3bd1e081 | 1401 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1402 | { |
1403 | void *status; | |
1404 | int ret; | |
1405 | ||
3bd1e081 MD |
1406 | if (consumer_data->pid != 0) { |
1407 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1408 | if (ret) { |
3bd1e081 | 1409 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1410 | return ret; |
1411 | } | |
3bd1e081 | 1412 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1413 | } else { |
1414 | return 0; | |
1415 | } | |
1416 | } | |
1417 | ||
8c0faa1d | 1418 | /* |
3bd1e081 | 1419 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1420 | * |
d063d709 | 1421 | * Return pid if successful else -1. |
8c0faa1d | 1422 | */ |
3bd1e081 | 1423 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1424 | { |
1425 | int ret; | |
1426 | pid_t pid; | |
53086306 | 1427 | const char *verbosity; |
8c0faa1d | 1428 | |
3bd1e081 | 1429 | DBG("Spawning consumerd"); |
c49dc785 | 1430 | |
8c0faa1d DG |
1431 | pid = fork(); |
1432 | if (pid == 0) { | |
1433 | /* | |
3bd1e081 | 1434 | * Exec consumerd. |
8c0faa1d | 1435 | */ |
3bd1e081 | 1436 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1437 | verbosity = "--verbose"; |
1438 | } else { | |
1439 | verbosity = "--quiet"; | |
1440 | } | |
3bd1e081 MD |
1441 | switch (consumer_data->type) { |
1442 | case LTTNG_CONSUMER_KERNEL: | |
1443 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
1444 | "lttng-consumerd", verbosity, "-k", NULL); | |
1445 | break; | |
1446 | case LTTNG_CONSUMER_UST: | |
1447 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
1448 | "lttng-consumerd", verbosity, "-u", NULL); | |
1449 | break; | |
1450 | default: | |
1451 | perror("unknown consumer type"); | |
1452 | exit(EXIT_FAILURE); | |
1453 | } | |
8c0faa1d DG |
1454 | if (errno != 0) { |
1455 | perror("kernel start consumer exec"); | |
1456 | } | |
1457 | exit(EXIT_FAILURE); | |
1458 | } else if (pid > 0) { | |
1459 | ret = pid; | |
8c0faa1d | 1460 | } else { |
3bd1e081 | 1461 | perror("start consumer fork"); |
8c0faa1d | 1462 | ret = -errno; |
8c0faa1d | 1463 | } |
8c0faa1d DG |
1464 | return ret; |
1465 | } | |
1466 | ||
693bd40b | 1467 | /* |
3bd1e081 | 1468 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1469 | */ |
3bd1e081 | 1470 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1471 | { |
1472 | int ret; | |
1473 | ||
3bd1e081 MD |
1474 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1475 | if (consumer_data->pid != 0) { | |
1476 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1477 | goto end; |
1478 | } | |
693bd40b | 1479 | |
3bd1e081 | 1480 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1481 | if (ret < 0) { |
3bd1e081 MD |
1482 | ERR("Spawning consumerd failed"); |
1483 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1484 | goto error; |
693bd40b | 1485 | } |
c49dc785 | 1486 | |
3bd1e081 MD |
1487 | /* Setting up the consumer_data pid */ |
1488 | consumer_data->pid = ret; | |
48842b30 | 1489 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1490 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1491 | |
3bd1e081 MD |
1492 | DBG2("Spawning consumer control thread"); |
1493 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1494 | if (ret < 0) { |
3bd1e081 | 1495 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1496 | goto error; |
1497 | } | |
1498 | ||
c49dc785 | 1499 | end: |
693bd40b DG |
1500 | return 0; |
1501 | ||
1502 | error: | |
1503 | return ret; | |
1504 | } | |
1505 | ||
b73401da | 1506 | /* |
d063d709 | 1507 | * modprobe_kernel_modules |
b73401da DG |
1508 | */ |
1509 | static int modprobe_kernel_modules(void) | |
1510 | { | |
ab147185 | 1511 | int ret = 0, i; |
b73401da DG |
1512 | char modprobe[256]; |
1513 | ||
ab147185 MD |
1514 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1515 | ret = snprintf(modprobe, sizeof(modprobe), | |
1516 | "/sbin/modprobe %s%s", | |
24b487b8 | 1517 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1518 | kernel_modules_list[i].name); |
b73401da DG |
1519 | if (ret < 0) { |
1520 | perror("snprintf modprobe"); | |
1521 | goto error; | |
1522 | } | |
ab147185 | 1523 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1524 | ret = system(modprobe); |
ab147185 MD |
1525 | if (ret == -1) { |
1526 | ERR("Unable to launch modprobe for module %s", | |
1527 | kernel_modules_list[i].name); | |
1528 | } else if (kernel_modules_list[i].required | |
d9800920 | 1529 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1530 | ERR("Unable to load module %s", |
1531 | kernel_modules_list[i].name); | |
1532 | } else { | |
1533 | DBG("Modprobe successfully %s", | |
1534 | kernel_modules_list[i].name); | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | error: | |
1539 | return ret; | |
1540 | } | |
1541 | ||
b73401da | 1542 | /* |
d063d709 | 1543 | * mount_debugfs |
b73401da DG |
1544 | */ |
1545 | static int mount_debugfs(char *path) | |
1546 | { | |
1547 | int ret; | |
1548 | char *type = "debugfs"; | |
1549 | ||
996b65c8 | 1550 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1551 | if (ret < 0) { |
7272acf5 | 1552 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1553 | goto error; |
1554 | } | |
1555 | ||
1556 | ret = mount(type, path, type, 0, NULL); | |
1557 | if (ret < 0) { | |
7272acf5 | 1558 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1559 | goto error; |
1560 | } | |
1561 | ||
1562 | DBG("Mounted debugfs successfully at %s", path); | |
1563 | ||
1564 | error: | |
1565 | return ret; | |
1566 | } | |
1567 | ||
8c0faa1d | 1568 | /* |
d063d709 | 1569 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1570 | */ |
f3ed775e | 1571 | static void init_kernel_tracer(void) |
8c0faa1d | 1572 | { |
b73401da DG |
1573 | int ret; |
1574 | char *proc_mounts = "/proc/mounts"; | |
1575 | char line[256]; | |
684d34d2 | 1576 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1577 | FILE *fp; |
1578 | ||
1579 | /* Detect debugfs */ | |
1580 | fp = fopen(proc_mounts, "r"); | |
1581 | if (fp == NULL) { | |
1582 | ERR("Unable to probe %s", proc_mounts); | |
1583 | goto error; | |
1584 | } | |
1585 | ||
1586 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1587 | if (strstr(line, "debugfs") != NULL) { | |
1588 | /* Remove first string */ | |
1589 | strtok(line, " "); | |
1590 | /* Dup string here so we can reuse line later on */ | |
1591 | debugfs_path = strdup(strtok(NULL, " ")); | |
1592 | DBG("Got debugfs path : %s", debugfs_path); | |
1593 | break; | |
1594 | } | |
1595 | } | |
1596 | ||
1597 | fclose(fp); | |
1598 | ||
1599 | /* Mount debugfs if needded */ | |
1600 | if (debugfs_path == NULL) { | |
1601 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1602 | if (ret < 0) { | |
1603 | perror("asprintf debugfs path"); | |
1604 | goto error; | |
1605 | } | |
1606 | ret = mount_debugfs(debugfs_path); | |
1607 | if (ret < 0) { | |
7272acf5 | 1608 | perror("Cannot mount debugfs"); |
b73401da DG |
1609 | goto error; |
1610 | } | |
1611 | } | |
1612 | ||
1613 | /* Modprobe lttng kernel modules */ | |
1614 | ret = modprobe_kernel_modules(); | |
1615 | if (ret < 0) { | |
1616 | goto error; | |
1617 | } | |
1618 | ||
1619 | /* Setup lttng kernel path */ | |
1620 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1621 | if (ret < 0) { | |
1622 | perror("asprintf lttng path"); | |
1623 | goto error; | |
1624 | } | |
1625 | ||
1626 | /* Open debugfs lttng */ | |
1627 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1628 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1629 | DBG("Failed to open %s", lttng_path); |
1630 | goto error; | |
8c0faa1d DG |
1631 | } |
1632 | ||
b73401da DG |
1633 | free(lttng_path); |
1634 | free(debugfs_path); | |
f3ed775e | 1635 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1636 | return; |
1637 | ||
1638 | error: | |
1639 | if (lttng_path) { | |
1640 | free(lttng_path); | |
1641 | } | |
1642 | if (debugfs_path) { | |
1643 | free(debugfs_path); | |
1644 | } | |
1645 | WARN("No kernel tracer available"); | |
1646 | kernel_tracer_fd = 0; | |
1647 | return; | |
f3ed775e | 1648 | } |
33a2b854 | 1649 | |
f3ed775e | 1650 | /* |
54d01ffb | 1651 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1652 | */ |
54d01ffb | 1653 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1654 | { |
f40799e8 | 1655 | int ret = 0; |
8c0faa1d | 1656 | |
3bd1e081 | 1657 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1658 | /* |
54d01ffb DG |
1659 | * Assign default kernel consumer socket if no consumer assigned to the |
1660 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1661 | * an extra security check. | |
d9800920 DG |
1662 | */ |
1663 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1664 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1665 | } |
1666 | ||
2bdd86d4 | 1667 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1668 | if (ret < 0) { |
f3ed775e DG |
1669 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1670 | goto error; | |
1671 | } | |
1d4b027a | 1672 | |
3bd1e081 | 1673 | session->consumer_fds_sent = 1; |
f3ed775e | 1674 | } |
1d4b027a DG |
1675 | |
1676 | error: | |
1677 | return ret; | |
8c0faa1d DG |
1678 | } |
1679 | ||
0177d773 DG |
1680 | /* |
1681 | * Create an UST session and add it to the session ust list. | |
1682 | */ | |
44d3bd01 DG |
1683 | static int create_ust_session(struct ltt_session *session, |
1684 | struct lttng_domain *domain) | |
0177d773 | 1685 | { |
44d3bd01 | 1686 | int ret; |
48842b30 | 1687 | unsigned int uid; |
13384287 | 1688 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1689 | |
1690 | switch (domain->type) { | |
48842b30 | 1691 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1692 | break; |
1693 | default: | |
13384287 | 1694 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1695 | goto error; |
1696 | } | |
0177d773 DG |
1697 | |
1698 | DBG("Creating UST session"); | |
1699 | ||
48842b30 DG |
1700 | session_lock_list(); |
1701 | uid = session_list_ptr->count; | |
1702 | session_unlock_list(); | |
1703 | ||
1704 | lus = trace_ust_create_session(session->path, uid, domain); | |
0177d773 | 1705 | if (lus == NULL) { |
44d3bd01 | 1706 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1707 | goto error; |
1708 | } | |
1709 | ||
48842b30 | 1710 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
0177d773 DG |
1711 | geteuid(), allowed_group()); |
1712 | if (ret < 0) { | |
1713 | if (ret != -EEXIST) { | |
1714 | ERR("Trace directory creation error"); | |
44d3bd01 | 1715 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1716 | goto error; |
1717 | } | |
1718 | } | |
1719 | ||
f6a9efaa DG |
1720 | /* The domain type dictate different actions on session creation */ |
1721 | switch (domain->type) { | |
48842b30 DG |
1722 | case LTTNG_DOMAIN_UST: |
1723 | /* No ustctl for the global UST domain */ | |
1724 | break; | |
1725 | default: | |
36dc12cc | 1726 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1727 | goto error; |
0177d773 | 1728 | } |
f6a9efaa | 1729 | session->ust_session = lus; |
44d3bd01 DG |
1730 | |
1731 | return LTTCOMM_OK; | |
0177d773 DG |
1732 | |
1733 | error: | |
1734 | free(lus); | |
1735 | return ret; | |
1736 | } | |
1737 | ||
333f285e | 1738 | /* |
d063d709 | 1739 | * Create a kernel tracer session then create the default channel. |
333f285e | 1740 | */ |
f3ed775e | 1741 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1742 | { |
f3ed775e | 1743 | int ret; |
f3ed775e DG |
1744 | |
1745 | DBG("Creating kernel session"); | |
1746 | ||
1747 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1748 | if (ret < 0) { | |
1749 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1750 | goto error; | |
333f285e DG |
1751 | } |
1752 | ||
d9800920 | 1753 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1754 | if (kconsumer_data.cmd_sock) { |
1755 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1756 | } |
1757 | ||
63053e7c DG |
1758 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1759 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1760 | if (ret < 0) { |
996b65c8 | 1761 | if (ret != -EEXIST) { |
7a485870 DG |
1762 | ERR("Trace directory creation error"); |
1763 | goto error; | |
1764 | } | |
1765 | } | |
1766 | ||
f3ed775e DG |
1767 | error: |
1768 | return ret; | |
333f285e DG |
1769 | } |
1770 | ||
6c9cc2ab DG |
1771 | /* |
1772 | * Using the session list, filled a lttng_session array to send back to the | |
1773 | * client for session listing. | |
1774 | * | |
1775 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1776 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1777 | */ |
1778 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1779 | { | |
1780 | int i = 0; | |
1781 | struct ltt_session *session; | |
1782 | ||
1783 | DBG("Getting all available session"); | |
1784 | /* | |
1785 | * Iterate over session list and append data after the control struct in | |
1786 | * the buffer. | |
1787 | */ | |
1788 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1789 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1790 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1791 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1792 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1793 | i++; |
1794 | } | |
1795 | } | |
1796 | ||
9f19cc17 DG |
1797 | /* |
1798 | * Fill lttng_channel array of all channels. | |
1799 | */ | |
b551a063 | 1800 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1801 | struct lttng_channel *channels) |
1802 | { | |
1803 | int i = 0; | |
1804 | struct ltt_kernel_channel *kchan; | |
1805 | ||
1806 | DBG("Listing channels for session %s", session->name); | |
1807 | ||
b551a063 DG |
1808 | switch (domain) { |
1809 | case LTTNG_DOMAIN_KERNEL: | |
1810 | /* Kernel channels */ | |
1811 | if (session->kernel_session != NULL) { | |
1812 | cds_list_for_each_entry(kchan, | |
1813 | &session->kernel_session->channel_list.head, list) { | |
1814 | /* Copy lttng_channel struct to array */ | |
1815 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1816 | channels[i].enabled = kchan->enabled; | |
1817 | i++; | |
1818 | } | |
1819 | } | |
1820 | break; | |
1821 | case LTTNG_DOMAIN_UST: | |
1822 | { | |
1823 | struct cds_lfht_iter iter; | |
1824 | struct ltt_ust_channel *uchan; | |
1825 | ||
1826 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
1827 | &iter, uchan, node) { | |
1828 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
1829 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
1830 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
1831 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
1832 | channels[i].attr.switch_timer_interval = | |
1833 | uchan->attr.switch_timer_interval; | |
1834 | channels[i].attr.read_timer_interval = | |
1835 | uchan->attr.read_timer_interval; | |
1836 | channels[i].attr.output = uchan->attr.output; | |
1837 | } | |
1838 | break; | |
1839 | } | |
1840 | default: | |
1841 | break; | |
1842 | } | |
1843 | } | |
1844 | ||
1845 | /* | |
1846 | * Create a list of ust global domain events. | |
1847 | */ | |
1848 | static int list_lttng_ust_global_events(char *channel_name, | |
1849 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
1850 | { | |
1851 | int i = 0, ret = 0; | |
1852 | unsigned int nb_event = 0; | |
1853 | struct cds_lfht_iter iter; | |
1854 | struct ltt_ust_channel *uchan; | |
1855 | struct ltt_ust_event *uevent; | |
1856 | struct lttng_event *tmp; | |
1857 | ||
1858 | DBG("Listing UST global events for channel %s", channel_name); | |
1859 | ||
1860 | rcu_read_lock(); | |
1861 | ||
1862 | /* Count events in all channels */ | |
1863 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1864 | nb_event += hashtable_get_count(uchan->events); | |
1865 | } | |
1866 | ||
1867 | if (nb_event == 0) { | |
1868 | ret = nb_event; | |
1869 | goto error; | |
1870 | } | |
1871 | ||
1872 | DBG3("Listing UST global %d events", nb_event); | |
1873 | ||
1874 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1875 | if (tmp == NULL) { | |
1876 | ret = -LTTCOMM_FATAL; | |
1877 | goto error; | |
1878 | } | |
1879 | ||
1880 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1881 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { | |
1882 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
1883 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
37357452 | 1884 | tmp[i].enabled = uevent->enabled; |
b551a063 DG |
1885 | switch (uevent->attr.instrumentation) { |
1886 | case LTTNG_UST_TRACEPOINT: | |
1887 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
1888 | break; | |
1889 | case LTTNG_UST_PROBE: | |
1890 | tmp[i].type = LTTNG_EVENT_PROBE; | |
1891 | break; | |
1892 | case LTTNG_UST_FUNCTION: | |
1893 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
1894 | break; | |
1895 | } | |
9f19cc17 DG |
1896 | i++; |
1897 | } | |
1898 | } | |
1899 | ||
b551a063 DG |
1900 | ret = nb_event; |
1901 | *events = tmp; | |
1902 | ||
1903 | error: | |
1904 | rcu_read_unlock(); | |
1905 | return ret; | |
9f19cc17 DG |
1906 | } |
1907 | ||
1908 | /* | |
b551a063 | 1909 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 1910 | */ |
b551a063 DG |
1911 | static int list_lttng_kernel_events(char *channel_name, |
1912 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 1913 | { |
b551a063 DG |
1914 | int i = 0, ret; |
1915 | unsigned int nb_event; | |
9f19cc17 | 1916 | struct ltt_kernel_event *event; |
b551a063 DG |
1917 | struct ltt_kernel_channel *kchan; |
1918 | ||
1919 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
1920 | if (kchan == NULL) { | |
1921 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1922 | goto error; | |
1923 | } | |
1924 | ||
1925 | nb_event = kchan->event_count; | |
9f19cc17 DG |
1926 | |
1927 | DBG("Listing events for channel %s", kchan->channel->name); | |
1928 | ||
b551a063 DG |
1929 | if (nb_event == 0) { |
1930 | ret = nb_event; | |
1931 | goto error; | |
1932 | } | |
1933 | ||
1934 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1935 | if (*events == NULL) { | |
1936 | ret = LTTCOMM_FATAL; | |
1937 | goto error; | |
1938 | } | |
1939 | ||
9f19cc17 DG |
1940 | /* Kernel channels */ |
1941 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
1942 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
1943 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
1944 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
1945 | switch (event->event->instrumentation) { |
1946 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 1947 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
1948 | break; |
1949 | case LTTNG_KERNEL_KPROBE: | |
1950 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
1951 | (*events)[i].type = LTTNG_EVENT_PROBE; |
1952 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
1953 | sizeof(struct lttng_kernel_kprobe)); |
1954 | break; | |
1955 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
1956 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
1957 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
1958 | sizeof(struct lttng_kernel_function)); |
1959 | break; | |
0133c199 | 1960 | case LTTNG_KERNEL_NOOP: |
b551a063 | 1961 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 1962 | break; |
a54bd42d | 1963 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 1964 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 1965 | break; |
7a3d1328 MD |
1966 | case LTTNG_KERNEL_ALL: |
1967 | assert(0); | |
1968 | break; | |
9f19cc17 DG |
1969 | } |
1970 | i++; | |
1971 | } | |
b551a063 DG |
1972 | |
1973 | return nb_event; | |
1974 | ||
1975 | error: | |
1976 | return ret; | |
9f19cc17 DG |
1977 | } |
1978 | ||
fac6795d | 1979 | /* |
54d01ffb | 1980 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 1981 | */ |
54d01ffb DG |
1982 | static int cmd_disable_channel(struct ltt_session *session, |
1983 | int domain, char *channel_name) | |
fac6795d | 1984 | { |
54d01ffb | 1985 | int ret; |
379473d2 | 1986 | |
54d01ffb DG |
1987 | switch (domain) { |
1988 | case LTTNG_DOMAIN_KERNEL: | |
1989 | ret = channel_kernel_disable(session->kernel_session, | |
1990 | channel_name); | |
1991 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
1992 | goto error; |
1993 | } | |
54d01ffb DG |
1994 | |
1995 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c | 1996 | break; |
44d3bd01 DG |
1997 | case LTTNG_DOMAIN_UST_PID: |
1998 | break; | |
d0254c7c | 1999 | default: |
44d3bd01 | 2000 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
54d01ffb | 2001 | goto error; |
20fe2104 DG |
2002 | } |
2003 | ||
54d01ffb | 2004 | ret = LTTCOMM_OK; |
d65106b1 | 2005 | |
54d01ffb DG |
2006 | error: |
2007 | return ret; | |
2008 | } | |
2009 | ||
56fff090 DG |
2010 | /* |
2011 | * Copy channel from attributes and set it in the application channel list. | |
2012 | */ | |
f6a9efaa | 2013 | /* |
56fff090 DG |
2014 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
2015 | struct lttng_channel *attr, struct ust_app *app) | |
2016 | { | |
2017 | int ret; | |
2018 | struct ltt_ust_channel *uchan, *new_chan; | |
2019 | ||
f6a9efaa | 2020 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
56fff090 DG |
2021 | if (uchan == NULL) { |
2022 | ret = LTTCOMM_FATAL; | |
2023 | goto error; | |
2024 | } | |
2025 | ||
2026 | new_chan = trace_ust_create_channel(attr, usess->path); | |
2027 | if (new_chan == NULL) { | |
2028 | PERROR("malloc ltt_ust_channel"); | |
2029 | ret = LTTCOMM_FATAL; | |
2030 | goto error; | |
2031 | } | |
2032 | ||
2033 | ret = channel_ust_copy(new_chan, uchan); | |
2034 | if (ret < 0) { | |
2035 | ret = LTTCOMM_FATAL; | |
2036 | goto error; | |
2037 | } | |
2038 | ||
56fff090 DG |
2039 | error: |
2040 | return ret; | |
2041 | } | |
f6a9efaa | 2042 | */ |
56fff090 | 2043 | |
54d01ffb DG |
2044 | /* |
2045 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2046 | */ | |
44d3bd01 DG |
2047 | static int cmd_enable_channel(struct ltt_session *session, |
2048 | struct lttng_domain *domain, struct lttng_channel *attr) | |
54d01ffb DG |
2049 | { |
2050 | int ret; | |
f6a9efaa DG |
2051 | struct ltt_ust_session *usess = session->ust_session; |
2052 | ||
5d56b5aa | 2053 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2054 | |
44d3bd01 DG |
2055 | switch (domain->type) { |
2056 | case LTTNG_DOMAIN_KERNEL: | |
2057 | { | |
2058 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2059 | |
44d3bd01 DG |
2060 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2061 | session->kernel_session); | |
2062 | if (kchan == NULL) { | |
2063 | ret = channel_kernel_create(session->kernel_session, | |
2064 | attr, kernel_poll_pipe[1]); | |
2065 | } else { | |
2066 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2067 | } | |
2068 | ||
2069 | if (ret != LTTCOMM_OK) { | |
2070 | goto error; | |
2071 | } | |
2072 | ||
2073 | kernel_wait_quiescent(kernel_tracer_fd); | |
2074 | break; | |
2075 | } | |
f6a9efaa DG |
2076 | case LTTNG_DOMAIN_UST: |
2077 | { | |
2078 | struct ltt_ust_channel *uchan; | |
2079 | ||
48842b30 | 2080 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
f6a9efaa | 2081 | |
48842b30 | 2082 | /* Get channel in global UST domain HT */ |
f6a9efaa DG |
2083 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2084 | attr->name); | |
2085 | if (uchan == NULL) { | |
48842b30 | 2086 | uchan = trace_ust_create_channel(attr, usess->pathname); |
f6a9efaa DG |
2087 | if (uchan == NULL) { |
2088 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2089 | goto error; | |
2090 | } | |
d5cd1f34 | 2091 | |
f6a9efaa DG |
2092 | rcu_read_lock(); |
2093 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); | |
2094 | rcu_read_unlock(); | |
48842b30 | 2095 | DBG2("UST channel %s added to global domain HT", attr->name); |
f6a9efaa DG |
2096 | } else { |
2097 | ret = LTTCOMM_UST_CHAN_EXIST; | |
2098 | goto error; | |
2099 | } | |
2100 | ||
421cb601 | 2101 | /* Add channel to all registered applications */ |
5b4a0ec0 | 2102 | ret = ust_app_create_channel_all(usess, uchan); |
509cbaf8 | 2103 | if (ret != 0) { |
48842b30 DG |
2104 | goto error; |
2105 | } | |
f6a9efaa | 2106 | |
37357452 DG |
2107 | uchan->enabled = 1; |
2108 | ||
f6a9efaa DG |
2109 | break; |
2110 | } | |
44d3bd01 DG |
2111 | case LTTNG_DOMAIN_UST_PID: |
2112 | { | |
f6a9efaa | 2113 | /* |
56fff090 DG |
2114 | int sock; |
2115 | struct ltt_ust_channel *uchan; | |
44d3bd01 | 2116 | struct ltt_ust_session *usess; |
56fff090 | 2117 | struct ust_app *app; |
44d3bd01 DG |
2118 | |
2119 | usess = trace_ust_get_session_by_pid(&session->ust_session_list, | |
2120 | domain->attr.pid); | |
2121 | if (usess == NULL) { | |
2122 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2123 | goto error; | |
2124 | } | |
2125 | ||
56fff090 | 2126 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
2127 | if (app == NULL) { |
2128 | ret = LTTCOMM_APP_NOT_FOUND; | |
2129 | goto error; | |
2130 | } | |
56fff090 | 2131 | sock = app->sock; |
44d3bd01 DG |
2132 | |
2133 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
2134 | if (uchan == NULL) { | |
56fff090 | 2135 | ret = channel_ust_create(usess, attr, sock); |
44d3bd01 | 2136 | } else { |
56fff090 | 2137 | ret = channel_ust_enable(usess, uchan, sock); |
44d3bd01 DG |
2138 | } |
2139 | ||
2140 | if (ret != LTTCOMM_OK) { | |
2141 | goto error; | |
2142 | } | |
2143 | ||
56fff090 DG |
2144 | ret = copy_ust_channel_to_app(usess, attr, app); |
2145 | if (ret != LTTCOMM_OK) { | |
44d3bd01 DG |
2146 | goto error; |
2147 | } | |
2148 | ||
44d3bd01 DG |
2149 | DBG("UST channel %s created for app sock %d with pid %d", |
2150 | attr->name, app->sock, domain->attr.pid); | |
f6a9efaa DG |
2151 | */ |
2152 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2153 | goto error; | |
44d3bd01 DG |
2154 | } |
2155 | default: | |
2156 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2157 | goto error; | |
54d01ffb DG |
2158 | } |
2159 | ||
2160 | ret = LTTCOMM_OK; | |
2161 | ||
2162 | error: | |
2163 | return ret; | |
2164 | } | |
2165 | ||
2166 | /* | |
2167 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2168 | */ | |
2169 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2170 | char *channel_name, char *event_name) | |
2171 | { | |
2172 | int ret; | |
54d01ffb DG |
2173 | |
2174 | switch (domain) { | |
2175 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2176 | { |
2177 | struct ltt_kernel_channel *kchan; | |
2178 | ||
54d01ffb DG |
2179 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2180 | session->kernel_session); | |
2181 | if (kchan == NULL) { | |
2182 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2183 | goto error; | |
d65106b1 DG |
2184 | } |
2185 | ||
7a3d1328 | 2186 | ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); |
54d01ffb DG |
2187 | if (ret != LTTCOMM_OK) { |
2188 | goto error; | |
2189 | } | |
2190 | ||
2191 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2192 | break; |
2bdd86d4 MD |
2193 | } |
2194 | case LTTNG_DOMAIN_UST: | |
2bdd86d4 MD |
2195 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2196 | case LTTNG_DOMAIN_UST_PID: | |
2197 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2198 | default: |
2bdd86d4 | 2199 | /* TODO: Other UST domains */ |
54d01ffb DG |
2200 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2201 | goto error; | |
d65106b1 | 2202 | } |
26cc6b4e | 2203 | |
54d01ffb DG |
2204 | ret = LTTCOMM_OK; |
2205 | ||
2206 | error: | |
2207 | return ret; | |
2208 | } | |
2209 | ||
2210 | /* | |
2211 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2212 | */ | |
2213 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2214 | char *channel_name) | |
2215 | { | |
2216 | int ret; | |
2217 | struct ltt_kernel_channel *kchan; | |
2218 | ||
2219 | switch (domain) { | |
2220 | case LTTNG_DOMAIN_KERNEL: | |
2221 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2222 | session->kernel_session); | |
2223 | if (kchan == NULL) { | |
2224 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2225 | goto error; | |
26cc6b4e DG |
2226 | } |
2227 | ||
54d01ffb DG |
2228 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
2229 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 2230 | goto error; |
26cc6b4e DG |
2231 | } |
2232 | ||
54d01ffb | 2233 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2234 | break; |
54d01ffb DG |
2235 | default: |
2236 | /* TODO: Userspace tracing */ | |
2237 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2238 | goto error; | |
26cc6b4e | 2239 | } |
e953ef25 | 2240 | |
54d01ffb | 2241 | ret = LTTCOMM_OK; |
e953ef25 | 2242 | |
54d01ffb DG |
2243 | error: |
2244 | return ret; | |
2245 | } | |
f5177a38 | 2246 | |
54d01ffb DG |
2247 | /* |
2248 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2249 | */ | |
2250 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2251 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2252 | { | |
2253 | int ret; | |
f5177a38 | 2254 | |
54d01ffb DG |
2255 | switch (domain) { |
2256 | case LTTNG_DOMAIN_KERNEL: | |
2257 | /* Add kernel context to kernel tracer */ | |
2258 | ret = context_kernel_add(session->kernel_session, ctx, | |
2259 | event_name, channel_name); | |
2260 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2261 | goto error; |
e953ef25 | 2262 | } |
2bdd86d4 MD |
2263 | break; |
2264 | case LTTNG_DOMAIN_UST: | |
2265 | { | |
48842b30 DG |
2266 | /* |
2267 | struct ltt_ust_session *usess; | |
e953ef25 | 2268 | |
48842b30 DG |
2269 | cds_list_for_each_entry(usess, &session->ust_session_list.head, list) { |
2270 | ret = context_ust_add(usess, ctx, | |
2271 | event_name, channel_name, domain); | |
2bdd86d4 MD |
2272 | if (ret != LTTCOMM_OK) { |
2273 | goto error; | |
2274 | } | |
2275 | } | |
e953ef25 | 2276 | break; |
48842b30 | 2277 | */ |
2bdd86d4 | 2278 | } |
54d01ffb | 2279 | default: |
2bdd86d4 | 2280 | /* TODO: UST other domains */ |
54d01ffb DG |
2281 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2282 | goto error; | |
e953ef25 | 2283 | } |
950131af | 2284 | |
54d01ffb | 2285 | ret = LTTCOMM_OK; |
950131af | 2286 | |
54d01ffb DG |
2287 | error: |
2288 | return ret; | |
2289 | } | |
2290 | ||
2291 | /* | |
2292 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2293 | */ | |
2294 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2295 | char *channel_name, struct lttng_event *event) | |
2296 | { | |
2297 | int ret; | |
f6cd6b0f | 2298 | struct lttng_channel *attr; |
48842b30 | 2299 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2300 | |
2301 | switch (domain) { | |
2302 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2303 | { |
2304 | struct ltt_kernel_channel *kchan; | |
2305 | ||
54d01ffb DG |
2306 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2307 | session->kernel_session); | |
2308 | if (kchan == NULL) { | |
f6cd6b0f DG |
2309 | attr = channel_new_default_attr(domain); |
2310 | if (attr == NULL) { | |
2311 | ret = LTTCOMM_FATAL; | |
2312 | goto error; | |
2313 | } | |
2314 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2315 | ||
54d01ffb | 2316 | /* This call will notify the kernel thread */ |
44d3bd01 | 2317 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2318 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2319 | if (ret != LTTCOMM_OK) { |
f5177a38 DG |
2320 | goto error; |
2321 | } | |
54d01ffb | 2322 | } |
950131af | 2323 | |
54d01ffb DG |
2324 | /* Get the newly created kernel channel pointer */ |
2325 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2326 | session->kernel_session); | |
2327 | if (kchan == NULL) { | |
2328 | /* This sould not happen... */ | |
2329 | ret = LTTCOMM_FATAL; | |
2330 | goto error; | |
2331 | } | |
f5177a38 | 2332 | |
48842b30 DG |
2333 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2334 | event); | |
54d01ffb | 2335 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2336 | goto error; |
950131af DG |
2337 | } |
2338 | ||
54d01ffb | 2339 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2340 | break; |
2bdd86d4 MD |
2341 | } |
2342 | case LTTNG_DOMAIN_UST: | |
2343 | { | |
48842b30 DG |
2344 | struct ltt_ust_channel *uchan; |
2345 | struct ltt_ust_event *uevent; | |
2bdd86d4 | 2346 | |
48842b30 DG |
2347 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2348 | channel_name); | |
2349 | if (uchan == NULL) { | |
2350 | /* TODO: Create default channel */ | |
2351 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2352 | goto error; | |
2353 | } | |
2bdd86d4 | 2354 | |
48842b30 DG |
2355 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); |
2356 | if (uevent == NULL) { | |
2357 | uevent = trace_ust_create_event(event); | |
2358 | if (uevent == NULL) { | |
2bdd86d4 MD |
2359 | ret = LTTCOMM_FATAL; |
2360 | goto error; | |
2361 | } | |
d5cd1f34 | 2362 | |
48842b30 | 2363 | } |
2bdd86d4 | 2364 | |
5b4a0ec0 | 2365 | ret = ust_app_create_event_all(usess, uchan, uevent); |
48842b30 DG |
2366 | if (ret < 0) { |
2367 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2368 | goto error; | |
2bdd86d4 | 2369 | } |
487cf67c | 2370 | |
d5cd1f34 | 2371 | /* Add ltt ust event to channel */ |
487cf67c DG |
2372 | rcu_read_lock(); |
2373 | hashtable_add_unique(uchan->events, &uevent->node); | |
2374 | rcu_read_unlock(); | |
d5cd1f34 | 2375 | |
37357452 DG |
2376 | uevent->enabled = 1; |
2377 | ||
d5cd1f34 DG |
2378 | DBG3("UST ltt event %s added to channel %s", uevent->attr.name, |
2379 | uchan->name); | |
2bdd86d4 MD |
2380 | break; |
2381 | } | |
2382 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2383 | case LTTNG_DOMAIN_UST_PID: | |
2384 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2385 | default: |
54d01ffb DG |
2386 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2387 | goto error; | |
950131af | 2388 | } |
d36b8583 | 2389 | |
54d01ffb | 2390 | ret = LTTCOMM_OK; |
d36b8583 | 2391 | |
54d01ffb DG |
2392 | error: |
2393 | return ret; | |
2394 | } | |
7d29a247 | 2395 | |
54d01ffb DG |
2396 | /* |
2397 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2398 | */ | |
2399 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2400 | char *channel_name, int event_type) |
54d01ffb DG |
2401 | { |
2402 | int ret; | |
2403 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2404 | |
54d01ffb DG |
2405 | switch (domain) { |
2406 | case LTTNG_DOMAIN_KERNEL: | |
2407 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2408 | session->kernel_session); | |
2409 | if (kchan == NULL) { | |
2410 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2411 | ret = channel_kernel_create(session->kernel_session, NULL, |
2412 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2413 | if (ret != LTTCOMM_OK) { |
2414 | goto error; | |
d36b8583 | 2415 | } |
54d01ffb | 2416 | } |
0d0c377a | 2417 | |
54d01ffb DG |
2418 | /* Get the newly created kernel channel pointer */ |
2419 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2420 | session->kernel_session); | |
2421 | if (kchan == NULL) { | |
2422 | /* This sould not happen... */ | |
2423 | ret = LTTCOMM_FATAL; | |
2424 | goto error; | |
2425 | } | |
0fdd1e2c | 2426 | |
7a3d1328 MD |
2427 | switch (event_type) { |
2428 | case LTTNG_KERNEL_SYSCALL: | |
2429 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2430 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2431 | break; |
2432 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2433 | /* |
7a3d1328 MD |
2434 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2435 | * events already registered to the channel. | |
8c9ae521 | 2436 | */ |
7a3d1328 MD |
2437 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2438 | kchan, kernel_tracer_fd); | |
2439 | break; | |
2440 | case LTTNG_KERNEL_ALL: | |
2441 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2442 | ret = event_kernel_enable_all(session->kernel_session, |
2443 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2444 | break; |
2445 | default: | |
2446 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2447 | goto error; | |
8c9ae521 | 2448 | } |
54d01ffb | 2449 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2450 | goto error; |
d36b8583 DG |
2451 | } |
2452 | ||
54d01ffb | 2453 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2454 | break; |
54d01ffb DG |
2455 | default: |
2456 | /* TODO: Userspace tracing */ | |
2457 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2458 | goto error; | |
d36b8583 | 2459 | } |
f3ed775e | 2460 | |
54d01ffb DG |
2461 | ret = LTTCOMM_OK; |
2462 | ||
2463 | error: | |
2464 | return ret; | |
2465 | } | |
2466 | ||
2467 | /* | |
2468 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2469 | */ | |
2470 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2471 | { | |
2472 | int ret; | |
2473 | ssize_t nb_events = 0; | |
2474 | ||
2475 | switch (domain) { | |
2476 | case LTTNG_DOMAIN_KERNEL: | |
2477 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2478 | if (nb_events < 0) { | |
2479 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2480 | goto error; | |
894be886 | 2481 | } |
54d01ffb | 2482 | break; |
b551a063 DG |
2483 | case LTTNG_DOMAIN_UST: |
2484 | nb_events = ust_app_list_events(events); | |
2485 | if (nb_events < 0) { | |
2486 | ret = LTTCOMM_UST_LIST_FAIL; | |
2487 | goto error; | |
2488 | } | |
2489 | break; | |
54d01ffb | 2490 | default: |
54d01ffb DG |
2491 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2492 | goto error; | |
2493 | } | |
894be886 | 2494 | |
54d01ffb | 2495 | return nb_events; |
7d29a247 | 2496 | |
54d01ffb DG |
2497 | error: |
2498 | /* Return negative value to differentiate return code */ | |
2499 | return -ret; | |
2500 | } | |
b389abbe | 2501 | |
54d01ffb DG |
2502 | /* |
2503 | * Command LTTNG_START_TRACE processed by the client thread. | |
2504 | */ | |
2505 | static int cmd_start_trace(struct ltt_session *session) | |
2506 | { | |
2507 | int ret; | |
54d01ffb | 2508 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2509 | struct ltt_ust_session *usess; |
b389abbe | 2510 | |
54d01ffb DG |
2511 | /* Short cut */ |
2512 | ksession = session->kernel_session; | |
b9d9b220 | 2513 | usess = session->ust_session; |
5eb91c98 | 2514 | |
54d01ffb DG |
2515 | /* Kernel tracing */ |
2516 | if (ksession != NULL) { | |
2bdd86d4 MD |
2517 | struct ltt_kernel_channel *kchan; |
2518 | ||
54d01ffb DG |
2519 | /* Open kernel metadata */ |
2520 | if (ksession->metadata == NULL) { | |
2521 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2522 | if (ret < 0) { | |
2523 | ret = LTTCOMM_KERN_META_FAIL; | |
2524 | goto error; | |
b389abbe | 2525 | } |
54d01ffb | 2526 | } |
7d29a247 | 2527 | |
54d01ffb DG |
2528 | /* Open kernel metadata stream */ |
2529 | if (ksession->metadata_stream_fd == 0) { | |
2530 | ret = kernel_open_metadata_stream(ksession); | |
2531 | if (ret < 0) { | |
2532 | ERR("Kernel create metadata stream failed"); | |
2533 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2534 | goto error; | |
2535 | } | |
2536 | } | |
2537 | ||
2538 | /* For each channel */ | |
2539 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2540 | if (kchan->stream_count == 0) { | |
2541 | ret = kernel_open_channel_stream(kchan); | |
2542 | if (ret < 0) { | |
2543 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2544 | goto error; |
2545 | } | |
54d01ffb DG |
2546 | /* Update the stream global counter */ |
2547 | ksession->stream_count_global += ret; | |
7d29a247 | 2548 | } |
54d01ffb DG |
2549 | } |
2550 | ||
2551 | /* Setup kernel consumer socket and send fds to it */ | |
2552 | ret = init_kernel_tracing(ksession); | |
2553 | if (ret < 0) { | |
2554 | ret = LTTCOMM_KERN_START_FAIL; | |
2555 | goto error; | |
2556 | } | |
2557 | ||
2558 | /* This start the kernel tracing */ | |
2559 | ret = kernel_start_session(ksession); | |
2560 | if (ret < 0) { | |
2561 | ret = LTTCOMM_KERN_START_FAIL; | |
2562 | goto error; | |
2563 | } | |
2564 | ||
2565 | /* Quiescent wait after starting trace */ | |
2566 | kernel_wait_quiescent(kernel_tracer_fd); | |
2567 | } | |
2568 | ||
36dc12cc | 2569 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2570 | if (usess) { |
2571 | usess->start_trace = 1; | |
36dc12cc | 2572 | |
b9d9b220 DG |
2573 | ret = ust_app_start_trace_all(usess); |
2574 | if (ret < 0) { | |
2575 | ret = LTTCOMM_UST_START_FAIL; | |
2576 | goto error; | |
2577 | } | |
2bdd86d4 | 2578 | } |
54d01ffb DG |
2579 | |
2580 | ret = LTTCOMM_OK; | |
2581 | ||
2582 | error: | |
2583 | return ret; | |
2584 | } | |
2585 | ||
2586 | /* | |
2587 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2588 | */ | |
2589 | static int cmd_stop_trace(struct ltt_session *session) | |
2590 | { | |
2591 | int ret; | |
2592 | struct ltt_kernel_channel *kchan; | |
2593 | struct ltt_kernel_session *ksession; | |
48842b30 DG |
2594 | //struct ltt_ust_session *usess; |
2595 | //struct ltt_ust_channel *ustchan; | |
54d01ffb DG |
2596 | |
2597 | /* Short cut */ | |
2598 | ksession = session->kernel_session; | |
2599 | ||
2600 | /* Kernel tracer */ | |
2601 | if (ksession != NULL) { | |
2602 | DBG("Stop kernel tracing"); | |
2603 | ||
2604 | /* Flush all buffers before stopping */ | |
2605 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2606 | if (ret < 0) { | |
2607 | ERR("Kernel metadata flush failed"); | |
2608 | } | |
f34daff7 | 2609 | |
54d01ffb DG |
2610 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2611 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2612 | if (ret < 0) { |
54d01ffb | 2613 | ERR("Kernel flush buffer error"); |
7d29a247 | 2614 | } |
54d01ffb | 2615 | } |
19e70852 | 2616 | |
54d01ffb DG |
2617 | ret = kernel_stop_session(ksession); |
2618 | if (ret < 0) { | |
2619 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2620 | goto error; |
f3ed775e | 2621 | } |
54d01ffb DG |
2622 | |
2623 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2624 | } |
54d01ffb | 2625 | |
48842b30 | 2626 | #ifdef DISABLE |
2bdd86d4 MD |
2627 | /* Stop each UST session */ |
2628 | DBG("Stop UST tracing"); | |
48842b30 | 2629 | cds_list_for_each_entry(usess, &session->ust_session_list.head, list) { |
2bdd86d4 | 2630 | /* Flush all buffers before stopping */ |
48842b30 | 2631 | ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj); |
2bdd86d4 MD |
2632 | if (ret < 0) { |
2633 | ERR("UST metadata flush failed"); | |
2634 | } | |
2635 | ||
48842b30 DG |
2636 | cds_list_for_each_entry(ustchan, &usess->channels.head, list) { |
2637 | ret = ustctl_flush_buffer(usess->sock, ustchan->obj); | |
2bdd86d4 MD |
2638 | if (ret < 0) { |
2639 | ERR("UST flush buffer error"); | |
2640 | } | |
2641 | } | |
2642 | ||
48842b30 | 2643 | ret = ustctl_stop_session(usess->sock, usess->handle); |
2bdd86d4 MD |
2644 | if (ret < 0) { |
2645 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2646 | goto error; | |
2647 | } | |
2648 | ||
48842b30 | 2649 | ustctl_wait_quiescent(usess->sock); |
2bdd86d4 | 2650 | } |
48842b30 | 2651 | #endif |
54d01ffb DG |
2652 | |
2653 | ret = LTTCOMM_OK; | |
2654 | ||
2655 | error: | |
2656 | return ret; | |
2657 | } | |
2658 | ||
2659 | /* | |
2660 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2661 | */ | |
2662 | static int cmd_create_session(char *name, char *path) | |
2663 | { | |
2664 | int ret; | |
2665 | ||
2666 | ret = session_create(name, path); | |
2667 | if (ret != LTTCOMM_OK) { | |
2668 | goto error; | |
2669 | } | |
2670 | ||
2671 | ret = LTTCOMM_OK; | |
2672 | ||
2673 | error: | |
2674 | return ret; | |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2679 | */ | |
2680 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2681 | { | |
2682 | int ret; | |
2683 | ||
2684 | /* Clean kernel session teardown */ | |
2685 | teardown_kernel_session(session); | |
2686 | ||
2687 | /* | |
2688 | * Must notify the kernel thread here to update it's poll setin order | |
2689 | * to remove the channel(s)' fd just destroyed. | |
2690 | */ | |
2691 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2692 | if (ret < 0) { | |
2693 | perror("write kernel poll pipe"); | |
2694 | } | |
2695 | ||
271933a4 | 2696 | ret = session_destroy(session); |
54d01ffb DG |
2697 | |
2698 | return ret; | |
2699 | } | |
2700 | ||
2701 | /* | |
2702 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2703 | */ | |
2704 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2705 | { | |
2706 | int ret; | |
2707 | ||
2708 | switch (domain) { | |
2709 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2710 | { |
54d01ffb | 2711 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2712 | |
54d01ffb DG |
2713 | kcalibrate.type = calibrate->type; |
2714 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2715 | if (ret < 0) { |
54d01ffb DG |
2716 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2717 | goto error; | |
33a2b854 | 2718 | } |
54d01ffb DG |
2719 | break; |
2720 | } | |
2721 | default: | |
2722 | /* TODO: Userspace tracing */ | |
2723 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2724 | goto error; | |
2725 | } | |
33a2b854 | 2726 | |
54d01ffb | 2727 | ret = LTTCOMM_OK; |
33a2b854 | 2728 | |
54d01ffb DG |
2729 | error: |
2730 | return ret; | |
2731 | } | |
7d29a247 | 2732 | |
54d01ffb DG |
2733 | /* |
2734 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2735 | */ | |
2736 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2737 | char *sock_path) | |
2738 | { | |
2739 | int ret, sock; | |
b389abbe | 2740 | |
54d01ffb DG |
2741 | switch (domain) { |
2742 | case LTTNG_DOMAIN_KERNEL: | |
2743 | /* Can't register a consumer if there is already one */ | |
2744 | if (session->kernel_session->consumer_fd != 0) { | |
2745 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2746 | goto error; | |
2747 | } | |
2748 | ||
2749 | sock = lttcomm_connect_unix_sock(sock_path); | |
2750 | if (sock < 0) { | |
2751 | ret = LTTCOMM_CONNECT_FAIL; | |
2752 | goto error; | |
2753 | } | |
2754 | ||
2755 | session->kernel_session->consumer_fd = sock; | |
2756 | break; | |
2757 | default: | |
2758 | /* TODO: Userspace tracing */ | |
2759 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2760 | goto error; | |
2761 | } | |
2762 | ||
2763 | ret = LTTCOMM_OK; | |
2764 | ||
2765 | error: | |
2766 | return ret; | |
2767 | } | |
2768 | ||
2769 | /* | |
2770 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2771 | */ | |
2772 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2773 | struct lttng_domain **domains) | |
2774 | { | |
b551a063 | 2775 | int ret, index = 0; |
54d01ffb DG |
2776 | ssize_t nb_dom = 0; |
2777 | ||
2778 | if (session->kernel_session != NULL) { | |
b551a063 | 2779 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
2780 | nb_dom++; |
2781 | } | |
2782 | ||
b551a063 DG |
2783 | if (session->ust_session != NULL) { |
2784 | DBG3("Listing domains found UST global domain"); | |
2785 | nb_dom++; | |
2786 | } | |
54d01ffb | 2787 | |
b551a063 | 2788 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
2789 | if (*domains == NULL) { |
2790 | ret = -LTTCOMM_FATAL; | |
2791 | goto error; | |
2792 | } | |
2793 | ||
b551a063 DG |
2794 | if (session->kernel_session != NULL) { |
2795 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
2796 | index++; | |
2797 | } | |
2798 | ||
2799 | if (session->ust_session != NULL) { | |
2800 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
2801 | index++; | |
2802 | } | |
54d01ffb | 2803 | |
54d01ffb DG |
2804 | return nb_dom; |
2805 | ||
2806 | error: | |
2807 | return ret; | |
2808 | } | |
2809 | ||
2810 | /* | |
2811 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2812 | */ | |
b551a063 | 2813 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
2814 | struct lttng_channel **channels) |
2815 | { | |
2816 | int ret; | |
2817 | ssize_t nb_chan = 0; | |
2818 | ||
b551a063 DG |
2819 | switch (domain) { |
2820 | case LTTNG_DOMAIN_KERNEL: | |
2821 | if (session->kernel_session != NULL) { | |
2822 | nb_chan = session->kernel_session->channel_count; | |
2823 | } | |
2824 | DBG3("Number of kernel channels %ld", nb_chan); | |
2825 | break; | |
2826 | case LTTNG_DOMAIN_UST: | |
2827 | if (session->ust_session != NULL) { | |
2828 | nb_chan = hashtable_get_count( | |
2829 | session->ust_session->domain_global.channels); | |
2830 | } | |
2831 | DBG3("Number of UST global channels %ld", nb_chan); | |
2832 | break; | |
2833 | default: | |
2834 | *channels = NULL; | |
2835 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2836 | goto error; |
2837 | } | |
2838 | ||
b551a063 DG |
2839 | if (nb_chan > 0) { |
2840 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2841 | if (*channels == NULL) { | |
2842 | ret = -LTTCOMM_FATAL; | |
2843 | goto error; | |
2844 | } | |
54d01ffb | 2845 | |
b551a063 DG |
2846 | list_lttng_channels(domain, session, *channels); |
2847 | } else { | |
2848 | *channels = NULL; | |
2849 | } | |
2bdd86d4 | 2850 | |
54d01ffb DG |
2851 | return nb_chan; |
2852 | ||
2853 | error: | |
2854 | return ret; | |
2855 | } | |
2856 | ||
2857 | /* | |
2858 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2859 | */ | |
b551a063 | 2860 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
2861 | char *channel_name, struct lttng_event **events) |
2862 | { | |
b551a063 | 2863 | int ret = 0; |
54d01ffb | 2864 | ssize_t nb_event = 0; |
54d01ffb | 2865 | |
b551a063 DG |
2866 | switch (domain) { |
2867 | case LTTNG_DOMAIN_KERNEL: | |
2868 | if (session->kernel_session != NULL) { | |
2869 | nb_event = list_lttng_kernel_events(channel_name, | |
2870 | session->kernel_session, events); | |
54d01ffb | 2871 | } |
b551a063 DG |
2872 | break; |
2873 | case LTTNG_DOMAIN_UST: | |
2874 | { | |
2875 | if (session->ust_session != NULL) { | |
2876 | nb_event = list_lttng_ust_global_events(channel_name, | |
2877 | &session->ust_session->domain_global, events); | |
2878 | } | |
2879 | break; | |
54d01ffb | 2880 | } |
b551a063 DG |
2881 | default: |
2882 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2883 | goto error; |
2884 | } | |
2885 | ||
b551a063 | 2886 | ret = nb_event; |
54d01ffb DG |
2887 | |
2888 | error: | |
2889 | return ret; | |
2890 | } | |
2891 | ||
2892 | /* | |
2893 | * Process the command requested by the lttng client within the command | |
2894 | * context structure. This function make sure that the return structure (llm) | |
2895 | * is set and ready for transmission before returning. | |
2896 | * | |
2897 | * Return any error encountered or 0 for success. | |
2898 | */ | |
2899 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2900 | { | |
2901 | int ret = LTTCOMM_OK; | |
44d3bd01 | 2902 | int need_tracing_session = 1; |
54d01ffb DG |
2903 | |
2904 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2905 | ||
2906 | /* | |
2907 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2908 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2909 | * command. |
2910 | */ | |
2911 | switch(cmd_ctx->lsm->cmd_type) { | |
2912 | case LTTNG_LIST_SESSIONS: | |
2913 | case LTTNG_LIST_TRACEPOINTS: | |
2914 | case LTTNG_LIST_DOMAINS: | |
2915 | case LTTNG_LIST_CHANNELS: | |
2916 | case LTTNG_LIST_EVENTS: | |
2917 | break; | |
2918 | default: | |
2919 | /* Setup lttng message with no payload */ | |
2920 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2921 | if (ret < 0) { | |
2922 | /* This label does not try to unlock the session */ | |
2923 | goto init_setup_error; | |
2924 | } | |
2925 | } | |
2926 | ||
2927 | /* Commands that DO NOT need a session. */ | |
2928 | switch (cmd_ctx->lsm->cmd_type) { | |
2929 | case LTTNG_CALIBRATE: | |
2930 | case LTTNG_CREATE_SESSION: | |
2931 | case LTTNG_LIST_SESSIONS: | |
2932 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 2933 | need_tracing_session = 0; |
54d01ffb DG |
2934 | break; |
2935 | default: | |
2936 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 2937 | session_lock_list(); |
54d01ffb | 2938 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 2939 | session_unlock_list(); |
54d01ffb DG |
2940 | if (cmd_ctx->session == NULL) { |
2941 | if (cmd_ctx->lsm->session.name != NULL) { | |
2942 | ret = LTTCOMM_SESS_NOT_FOUND; | |
2943 | } else { | |
2944 | /* If no session name specified */ | |
2945 | ret = LTTCOMM_SELECT_SESS; | |
2946 | } | |
2947 | goto error; | |
2948 | } else { | |
2949 | /* Acquire lock for the session */ | |
2950 | session_lock(cmd_ctx->session); | |
2951 | } | |
2952 | break; | |
2953 | } | |
b389abbe | 2954 | |
54d01ffb DG |
2955 | /* |
2956 | * Check domain type for specific "pre-action". | |
2957 | */ | |
2958 | switch (cmd_ctx->lsm->domain.type) { | |
2959 | case LTTNG_DOMAIN_KERNEL: | |
2960 | /* Kernel tracer check */ | |
2961 | if (kernel_tracer_fd == 0) { | |
2962 | /* Basically, load kernel tracer modules */ | |
2963 | init_kernel_tracer(); | |
2964 | if (kernel_tracer_fd == 0) { | |
2965 | ret = LTTCOMM_KERN_NA; | |
2966 | goto error; | |
2967 | } | |
2968 | } | |
5eb91c98 | 2969 | |
54d01ffb | 2970 | /* Need a session for kernel command */ |
44d3bd01 | 2971 | if (need_tracing_session) { |
54d01ffb DG |
2972 | if (cmd_ctx->session->kernel_session == NULL) { |
2973 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 2974 | if (ret < 0) { |
54d01ffb | 2975 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
2976 | goto error; |
2977 | } | |
b389abbe | 2978 | } |
7d29a247 | 2979 | |
54d01ffb | 2980 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2981 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2982 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 2983 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2984 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2985 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2986 | if (ret < 0) { |
54d01ffb DG |
2987 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
2988 | goto error; | |
950131af | 2989 | } |
33a2b854 | 2990 | } |
3bd1e081 | 2991 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
0d0c377a | 2992 | } |
54d01ffb | 2993 | break; |
2bdd86d4 | 2994 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2995 | { |
44d3bd01 | 2996 | if (need_tracing_session) { |
f6a9efaa | 2997 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
2998 | ret = create_ust_session(cmd_ctx->session, |
2999 | &cmd_ctx->lsm->domain); | |
3000 | if (ret != LTTCOMM_OK) { | |
3001 | goto error; | |
3002 | } | |
3003 | } | |
2bdd86d4 MD |
3004 | /* Start the kernel consumer daemon */ |
3005 | pthread_mutex_lock(&ustconsumer_data.pid_mutex); | |
3006 | if (ustconsumer_data.pid == 0 && | |
3007 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3008 | pthread_mutex_unlock(&ustconsumer_data.pid_mutex); | |
3009 | ret = start_consumerd(&ustconsumer_data); | |
3010 | if (ret < 0) { | |
3011 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
3012 | goto error; | |
3013 | } | |
48842b30 | 3014 | |
ba5d816e | 3015 | ust_consumer_fd = ustconsumer_data.cmd_sock; |
2bdd86d4 MD |
3016 | } |
3017 | pthread_mutex_unlock(&ustconsumer_data.pid_mutex); | |
44d3bd01 DG |
3018 | } |
3019 | break; | |
48842b30 | 3020 | } |
54d01ffb | 3021 | default: |
54d01ffb DG |
3022 | break; |
3023 | } | |
33a2b854 | 3024 | |
54d01ffb DG |
3025 | /* Process by command type */ |
3026 | switch (cmd_ctx->lsm->cmd_type) { | |
3027 | case LTTNG_ADD_CONTEXT: | |
3028 | { | |
3029 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3030 | cmd_ctx->lsm->u.context.channel_name, | |
3031 | cmd_ctx->lsm->u.context.event_name, | |
3032 | &cmd_ctx->lsm->u.context.ctx); | |
3033 | break; | |
3034 | } | |
3035 | case LTTNG_DISABLE_CHANNEL: | |
3036 | { | |
3037 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3038 | cmd_ctx->lsm->u.disable.channel_name); | |
3039 | break; | |
3040 | } | |
3041 | case LTTNG_DISABLE_EVENT: | |
3042 | { | |
3043 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3044 | cmd_ctx->lsm->u.disable.channel_name, | |
3045 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3046 | ret = LTTCOMM_OK; |
3047 | break; | |
3048 | } | |
54d01ffb DG |
3049 | case LTTNG_DISABLE_ALL_EVENT: |
3050 | { | |
2bdd86d4 | 3051 | DBG("Disabling all events"); |
54d01ffb DG |
3052 | |
3053 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3054 | cmd_ctx->lsm->u.disable.channel_name); | |
3055 | break; | |
3056 | } | |
3057 | case LTTNG_ENABLE_CHANNEL: | |
3058 | { | |
44d3bd01 | 3059 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb DG |
3060 | &cmd_ctx->lsm->u.channel.chan); |
3061 | break; | |
3062 | } | |
3063 | case LTTNG_ENABLE_EVENT: | |
3064 | { | |
3065 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3066 | cmd_ctx->lsm->u.enable.channel_name, | |
3067 | &cmd_ctx->lsm->u.enable.event); | |
3068 | break; | |
3069 | } | |
3070 | case LTTNG_ENABLE_ALL_EVENT: | |
3071 | { | |
2bdd86d4 | 3072 | DBG("Enabling all events"); |
54d01ffb DG |
3073 | |
3074 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3075 | cmd_ctx->lsm->u.enable.channel_name, |
3076 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3077 | break; |
3078 | } | |
052da939 | 3079 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3080 | { |
9f19cc17 | 3081 | struct lttng_event *events; |
54d01ffb | 3082 | ssize_t nb_events; |
052da939 | 3083 | |
54d01ffb DG |
3084 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3085 | if (nb_events < 0) { | |
3086 | ret = -nb_events; | |
3087 | goto error; | |
2ef84c95 DG |
3088 | } |
3089 | ||
3090 | /* | |
3091 | * Setup lttng message with payload size set to the event list size in | |
3092 | * bytes and then copy list into the llm payload. | |
3093 | */ | |
052da939 | 3094 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3095 | if (ret < 0) { |
052da939 | 3096 | free(events); |
2ef84c95 DG |
3097 | goto setup_error; |
3098 | } | |
3099 | ||
3100 | /* Copy event list into message payload */ | |
9f19cc17 | 3101 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3102 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3103 | |
9f19cc17 | 3104 | free(events); |
2ef84c95 DG |
3105 | |
3106 | ret = LTTCOMM_OK; | |
3107 | break; | |
3108 | } | |
f3ed775e | 3109 | case LTTNG_START_TRACE: |
8c0faa1d | 3110 | { |
54d01ffb | 3111 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3112 | break; |
3113 | } | |
f3ed775e | 3114 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3115 | { |
54d01ffb | 3116 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3117 | break; |
3118 | } | |
5e16da05 MD |
3119 | case LTTNG_CREATE_SESSION: |
3120 | { | |
54d01ffb DG |
3121 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3122 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
3123 | break; |
3124 | } | |
3125 | case LTTNG_DESTROY_SESSION: | |
3126 | { | |
54d01ffb DG |
3127 | ret = cmd_destroy_session(cmd_ctx->session, |
3128 | cmd_ctx->lsm->session.name); | |
5461b305 | 3129 | break; |
5e16da05 | 3130 | } |
9f19cc17 | 3131 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3132 | { |
54d01ffb DG |
3133 | ssize_t nb_dom; |
3134 | struct lttng_domain *domains; | |
5461b305 | 3135 | |
54d01ffb DG |
3136 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3137 | if (nb_dom < 0) { | |
3138 | ret = -nb_dom; | |
3139 | goto error; | |
ce3d728c | 3140 | } |
520ff687 | 3141 | |
54d01ffb | 3142 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3143 | if (ret < 0) { |
3144 | goto setup_error; | |
520ff687 | 3145 | } |
57167058 | 3146 | |
54d01ffb DG |
3147 | /* Copy event list into message payload */ |
3148 | memcpy(cmd_ctx->llm->payload, domains, | |
3149 | nb_dom * sizeof(struct lttng_domain)); | |
3150 | ||
3151 | free(domains); | |
5e16da05 | 3152 | |
5461b305 | 3153 | ret = LTTCOMM_OK; |
5e16da05 MD |
3154 | break; |
3155 | } | |
9f19cc17 | 3156 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3157 | { |
54d01ffb DG |
3158 | size_t nb_chan; |
3159 | struct lttng_channel *channels; | |
3160 | ||
b551a063 DG |
3161 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3162 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3163 | if (nb_chan < 0) { |
3164 | ret = -nb_chan; | |
3165 | goto error; | |
5461b305 | 3166 | } |
ca95a216 | 3167 | |
54d01ffb | 3168 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3169 | if (ret < 0) { |
3170 | goto setup_error; | |
3171 | } | |
9f19cc17 | 3172 | |
54d01ffb DG |
3173 | /* Copy event list into message payload */ |
3174 | memcpy(cmd_ctx->llm->payload, channels, | |
3175 | nb_chan * sizeof(struct lttng_channel)); | |
3176 | ||
3177 | free(channels); | |
9f19cc17 DG |
3178 | |
3179 | ret = LTTCOMM_OK; | |
5461b305 | 3180 | break; |
5e16da05 | 3181 | } |
9f19cc17 | 3182 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3183 | { |
b551a063 | 3184 | ssize_t nb_event; |
684d34d2 | 3185 | struct lttng_event *events = NULL; |
9f19cc17 | 3186 | |
b551a063 | 3187 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3188 | cmd_ctx->lsm->u.list.channel_name, &events); |
3189 | if (nb_event < 0) { | |
3190 | ret = -nb_event; | |
3191 | goto error; | |
5461b305 | 3192 | } |
ca95a216 | 3193 | |
54d01ffb | 3194 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3195 | if (ret < 0) { |
3196 | goto setup_error; | |
3197 | } | |
9f19cc17 | 3198 | |
54d01ffb DG |
3199 | /* Copy event list into message payload */ |
3200 | memcpy(cmd_ctx->llm->payload, events, | |
3201 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3202 | |
54d01ffb | 3203 | free(events); |
9f19cc17 DG |
3204 | |
3205 | ret = LTTCOMM_OK; | |
5461b305 | 3206 | break; |
5e16da05 MD |
3207 | } |
3208 | case LTTNG_LIST_SESSIONS: | |
3209 | { | |
54d01ffb | 3210 | session_lock_list(); |
5461b305 | 3211 | |
6c9cc2ab | 3212 | if (session_list_ptr->count == 0) { |
f3ed775e | 3213 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3214 | session_unlock_list(); |
5461b305 | 3215 | goto error; |
57167058 | 3216 | } |
5e16da05 | 3217 | |
6c9cc2ab DG |
3218 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3219 | session_list_ptr->count); | |
5461b305 | 3220 | if (ret < 0) { |
54d01ffb | 3221 | session_unlock_list(); |
5461b305 | 3222 | goto setup_error; |
e065084a | 3223 | } |
5e16da05 | 3224 | |
6c9cc2ab DG |
3225 | /* Filled the session array */ |
3226 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3227 | ||
54d01ffb | 3228 | session_unlock_list(); |
5e16da05 | 3229 | |
5461b305 | 3230 | ret = LTTCOMM_OK; |
5e16da05 MD |
3231 | break; |
3232 | } | |
d0254c7c MD |
3233 | case LTTNG_CALIBRATE: |
3234 | { | |
54d01ffb DG |
3235 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3236 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3237 | break; |
3238 | } | |
d9800920 DG |
3239 | case LTTNG_REGISTER_CONSUMER: |
3240 | { | |
54d01ffb DG |
3241 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3242 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3243 | break; |
3244 | } | |
5e16da05 | 3245 | default: |
5e16da05 | 3246 | ret = LTTCOMM_UND; |
5461b305 | 3247 | break; |
fac6795d DG |
3248 | } |
3249 | ||
5461b305 | 3250 | error: |
5461b305 DG |
3251 | if (cmd_ctx->llm == NULL) { |
3252 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3253 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3254 | goto setup_error; |
3255 | } | |
3256 | } | |
54d01ffb | 3257 | /* Set return code */ |
5461b305 | 3258 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3259 | setup_error: |
b5541356 | 3260 | if (cmd_ctx->session) { |
54d01ffb | 3261 | session_unlock(cmd_ctx->session); |
b5541356 | 3262 | } |
54d01ffb | 3263 | init_setup_error: |
8028d920 | 3264 | return ret; |
fac6795d DG |
3265 | } |
3266 | ||
1d4b027a | 3267 | /* |
d063d709 DG |
3268 | * This thread manage all clients request using the unix client socket for |
3269 | * communication. | |
1d4b027a DG |
3270 | */ |
3271 | static void *thread_manage_clients(void *data) | |
3272 | { | |
5eb91c98 DG |
3273 | int sock = 0, ret, i, pollfd; |
3274 | uint32_t revents, nb_fd; | |
273ea72c | 3275 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3276 | struct lttng_poll_event events; |
1d4b027a DG |
3277 | |
3278 | DBG("[thread] Manage client started"); | |
3279 | ||
f6a9efaa DG |
3280 | rcu_register_thread(); |
3281 | ||
1d4b027a DG |
3282 | ret = lttcomm_listen_unix_sock(client_sock); |
3283 | if (ret < 0) { | |
3284 | goto error; | |
3285 | } | |
3286 | ||
5eb91c98 DG |
3287 | /* |
3288 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3289 | * more will be added to this poll set. | |
3290 | */ | |
3291 | ret = create_thread_poll_set(&events, 2); | |
3292 | if (ret < 0) { | |
3293 | goto error; | |
3294 | } | |
273ea72c | 3295 | |
5eb91c98 DG |
3296 | /* Add the application registration socket */ |
3297 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3298 | if (ret < 0) { | |
3299 | goto error; | |
3300 | } | |
273ea72c | 3301 | |
bbd973c2 DG |
3302 | /* |
3303 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3304 | */ |
3305 | if (opt_sig_parent) { | |
3306 | kill(ppid, SIGCHLD); | |
3307 | } | |
3308 | ||
3309 | while (1) { | |
1d4b027a | 3310 | DBG("Accepting client command ..."); |
273ea72c | 3311 | |
5eb91c98 DG |
3312 | nb_fd = LTTNG_POLL_GETNB(&events); |
3313 | ||
273ea72c | 3314 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3315 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3316 | if (ret < 0) { |
273ea72c DG |
3317 | goto error; |
3318 | } | |
3319 | ||
5eb91c98 DG |
3320 | for (i = 0; i < nb_fd; i++) { |
3321 | /* Fetch once the poll data */ | |
3322 | revents = LTTNG_POLL_GETEV(&events, i); | |
3323 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3324 | ||
3325 | /* Thread quit pipe has been closed. Killing thread. */ | |
3326 | ret = check_thread_quit_pipe(pollfd, revents); | |
3327 | if (ret) { | |
3328 | goto error; | |
3329 | } | |
3330 | ||
3331 | /* Event on the registration socket */ | |
3332 | if (pollfd == client_sock) { | |
3333 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3334 | ERR("Client socket poll error"); | |
3335 | goto error; | |
3336 | } | |
3337 | } | |
3338 | } | |
3339 | ||
3340 | DBG("Wait for client response"); | |
3341 | ||
3342 | sock = lttcomm_accept_unix_sock(client_sock); | |
3343 | if (sock < 0) { | |
273ea72c | 3344 | goto error; |
273ea72c DG |
3345 | } |
3346 | ||
5eb91c98 | 3347 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3348 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3349 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3350 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3351 | goto error; |
5eb91c98 | 3352 | } |
1d4b027a | 3353 | |
5eb91c98 | 3354 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3355 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3356 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3357 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3358 | goto error; |
3359 | } | |
1d4b027a | 3360 | |
5eb91c98 DG |
3361 | cmd_ctx->llm = NULL; |
3362 | cmd_ctx->session = NULL; | |
1d4b027a | 3363 | |
5eb91c98 DG |
3364 | /* |
3365 | * Data is received from the lttng client. The struct | |
3366 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3367 | * the client. | |
3368 | */ | |
3369 | DBG("Receiving data from client ..."); | |
3370 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
3371 | sizeof(struct lttcomm_session_msg)); | |
3372 | if (ret <= 0) { | |
3373 | DBG("Nothing recv() from client... continuing"); | |
3374 | close(sock); | |
3375 | free(cmd_ctx); | |
3376 | continue; | |
3377 | } | |
1d4b027a | 3378 | |
5eb91c98 DG |
3379 | // TODO: Validate cmd_ctx including sanity check for |
3380 | // security purpose. | |
f7776ea7 | 3381 | |
f6a9efaa | 3382 | rcu_thread_online(); |
5eb91c98 DG |
3383 | /* |
3384 | * This function dispatch the work to the kernel or userspace tracer | |
3385 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3386 | * informations for the client. The command context struct contains | |
3387 | * everything this function may needs. | |
3388 | */ | |
3389 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3390 | rcu_thread_offline(); |
5eb91c98 | 3391 | if (ret < 0) { |
bbd973c2 | 3392 | /* |
5eb91c98 | 3393 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3394 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3395 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3396 | */ |
bbd973c2 | 3397 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3398 | continue; |
3399 | } | |
d6e4fca4 | 3400 | |
54d01ffb DG |
3401 | DBG("Sending response (size: %d, retcode: %s)", |
3402 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3403 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3404 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3405 | if (ret < 0) { |
3406 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3407 | } |
1d4b027a | 3408 | |
5eb91c98 DG |
3409 | clean_command_ctx(&cmd_ctx); |
3410 | ||
3411 | /* End of transmission */ | |
273ea72c DG |
3412 | close(sock); |
3413 | } | |
3414 | ||
5eb91c98 DG |
3415 | error: |
3416 | DBG("Client thread dying"); | |
273ea72c | 3417 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3418 | close(client_sock); |
3419 | close(sock); | |
273ea72c | 3420 | |
5eb91c98 | 3421 | lttng_poll_clean(&events); |
a2fb29a5 | 3422 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3423 | |
3424 | rcu_unregister_thread(); | |
1d4b027a DG |
3425 | return NULL; |
3426 | } | |
3427 | ||
3428 | ||
fac6795d DG |
3429 | /* |
3430 | * usage function on stderr | |
3431 | */ | |
3432 | static void usage(void) | |
3433 | { | |
b716ce68 | 3434 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3435 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3436 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3437 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3438 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3439 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
3bd1e081 MD |
3440 | fprintf(stderr, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n"); |
3441 | fprintf(stderr, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n"); | |
d6f42150 DG |
3442 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3443 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3444 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3445 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3446 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3447 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3448 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
fac6795d DG |
3449 | } |
3450 | ||
3451 | /* | |
3452 | * daemon argument parsing | |
3453 | */ | |
3454 | static int parse_args(int argc, char **argv) | |
3455 | { | |
3456 | int c; | |
3457 | ||
3458 | static struct option long_options[] = { | |
3459 | { "client-sock", 1, 0, 'c' }, | |
3460 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3461 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3462 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
3463 | { "ustconsumerd-cmd-sock", 1, 0, 'D' }, | |
3464 | { "ustconsumerd-err-sock", 1, 0, 'F' }, | |
fac6795d | 3465 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3466 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3467 | { "help", 0, 0, 'h' }, |
3468 | { "group", 1, 0, 'g' }, | |
3469 | { "version", 0, 0, 'V' }, | |
75462a81 | 3470 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3471 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3472 | { "verbose-consumer", 0, 0, 'Z' }, |
fac6795d DG |
3473 | { NULL, 0, 0, 0 } |
3474 | }; | |
3475 | ||
3476 | while (1) { | |
3477 | int option_index = 0; | |
3bd1e081 | 3478 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z", |
54d01ffb | 3479 | long_options, &option_index); |
fac6795d DG |
3480 | if (c == -1) { |
3481 | break; | |
3482 | } | |
3483 | ||
3484 | switch (c) { | |
3485 | case 0: | |
3486 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3487 | if (optarg) { | |
3488 | fprintf(stderr, " with arg %s\n", optarg); | |
3489 | } | |
3490 | break; | |
b716ce68 | 3491 | case 'c': |
fac6795d DG |
3492 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3493 | break; | |
3494 | case 'a': | |
3495 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3496 | break; | |
3497 | case 'd': | |
3498 | opt_daemon = 1; | |
3499 | break; | |
3500 | case 'g': | |
3501 | opt_tracing_group = strdup(optarg); | |
3502 | break; | |
3503 | case 'h': | |
3504 | usage(); | |
3505 | exit(EXIT_FAILURE); | |
3506 | case 'V': | |
3507 | fprintf(stdout, "%s\n", VERSION); | |
3508 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3509 | case 'S': |
3510 | opt_sig_parent = 1; | |
3511 | break; | |
d6f42150 | 3512 | case 'E': |
3bd1e081 | 3513 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3514 | break; |
3515 | case 'C': | |
3bd1e081 MD |
3516 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3517 | break; | |
3518 | case 'F': | |
3519 | snprintf(ustconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3520 | break; | |
3521 | case 'D': | |
3522 | snprintf(ustconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3523 | break; |
75462a81 DG |
3524 | case 'q': |
3525 | opt_quiet = 1; | |
3526 | break; | |
3f9947db | 3527 | case 'v': |
53086306 DG |
3528 | /* Verbose level can increase using multiple -v */ |
3529 | opt_verbose += 1; | |
3f9947db | 3530 | break; |
31f73cc9 | 3531 | case 'Z': |
3bd1e081 | 3532 | opt_verbose_consumer += 1; |
31f73cc9 | 3533 | break; |
fac6795d DG |
3534 | default: |
3535 | /* Unknown option or other error. | |
3536 | * Error is printed by getopt, just return */ | |
3537 | return -1; | |
3538 | } | |
3539 | } | |
3540 | ||
3541 | return 0; | |
3542 | } | |
3543 | ||
3544 | /* | |
d063d709 | 3545 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3546 | * apps_sock - The communication socket for all UST apps. |
3547 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3548 | */ |
cf3af59e | 3549 | static int init_daemon_socket(void) |
fac6795d DG |
3550 | { |
3551 | int ret = 0; | |
3552 | mode_t old_umask; | |
3553 | ||
3554 | old_umask = umask(0); | |
3555 | ||
3556 | /* Create client tool unix socket */ | |
d6f42150 DG |
3557 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3558 | if (client_sock < 0) { | |
3559 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3560 | ret = -1; |
3561 | goto end; | |
3562 | } | |
3563 | ||
3564 | /* File permission MUST be 660 */ | |
3565 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3566 | if (ret < 0) { | |
d6f42150 | 3567 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3568 | perror("chmod"); |
3569 | goto end; | |
3570 | } | |
3571 | ||
3572 | /* Create the application unix socket */ | |
d6f42150 DG |
3573 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3574 | if (apps_sock < 0) { | |
3575 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3576 | ret = -1; |
3577 | goto end; | |
3578 | } | |
3579 | ||
d6f42150 | 3580 | /* File permission MUST be 666 */ |
54d01ffb DG |
3581 | ret = chmod(apps_unix_sock_path, |
3582 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3583 | if (ret < 0) { |
d6f42150 | 3584 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3585 | perror("chmod"); |
3586 | goto end; | |
3587 | } | |
3588 | ||
3589 | end: | |
3590 | umask(old_umask); | |
3591 | return ret; | |
3592 | } | |
3593 | ||
3594 | /* | |
54d01ffb DG |
3595 | * Check if the global socket is available, and if a daemon is answering at the |
3596 | * other side. If yes, error is returned. | |
fac6795d | 3597 | */ |
cf3af59e | 3598 | static int check_existing_daemon(void) |
fac6795d | 3599 | { |
7d8234d9 | 3600 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3601 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3602 | return 0; |
099e26bd | 3603 | } |
54d01ffb | 3604 | |
7d8234d9 | 3605 | /* Is there anybody out there ? */ |
099e26bd | 3606 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3607 | return -EEXIST; |
099e26bd | 3608 | } else { |
7d8234d9 | 3609 | return 0; |
099e26bd | 3610 | } |
fac6795d DG |
3611 | } |
3612 | ||
fac6795d | 3613 | /* |
d063d709 | 3614 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3615 | * |
d063d709 DG |
3616 | * Race window between mkdir and chown is OK because we are going from more |
3617 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3618 | */ |
d6f42150 | 3619 | static int set_permissions(void) |
fac6795d DG |
3620 | { |
3621 | int ret; | |
996b65c8 | 3622 | gid_t gid; |
fac6795d | 3623 | |
996b65c8 MD |
3624 | gid = allowed_group(); |
3625 | if (gid < 0) { | |
a463f419 DG |
3626 | if (is_root) { |
3627 | WARN("No tracing group detected"); | |
3628 | ret = 0; | |
3629 | } else { | |
3630 | ERR("Missing tracing group. Aborting execution."); | |
3631 | ret = -1; | |
3632 | } | |
fac6795d DG |
3633 | goto end; |
3634 | } | |
3635 | ||
d6f42150 | 3636 | /* Set lttng run dir */ |
996b65c8 | 3637 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3638 | if (ret < 0) { |
3639 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3640 | perror("chown"); | |
3641 | } | |
3642 | ||
3643 | /* lttng client socket path */ | |
996b65c8 | 3644 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3645 | if (ret < 0) { |
d6f42150 DG |
3646 | ERR("Unable to set group on %s", client_unix_sock_path); |
3647 | perror("chown"); | |
3648 | } | |
3649 | ||
3bd1e081 MD |
3650 | /* kconsumer error socket path */ |
3651 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3652 | if (ret < 0) { |
3bd1e081 MD |
3653 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
3654 | perror("chown"); | |
3655 | } | |
3656 | ||
3657 | /* ustconsumer error socket path */ | |
3658 | ret = chown(ustconsumer_data.err_unix_sock_path, 0, gid); | |
3659 | if (ret < 0) { | |
3660 | ERR("Unable to set group on %s", ustconsumer_data.err_unix_sock_path); | |
fac6795d DG |
3661 | perror("chown"); |
3662 | } | |
3663 | ||
d6f42150 | 3664 | DBG("All permissions are set"); |
e07ae692 | 3665 | |
fac6795d DG |
3666 | end: |
3667 | return ret; | |
3668 | } | |
3669 | ||
7a485870 | 3670 | /* |
d063d709 | 3671 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3672 | */ |
3673 | static int create_kernel_poll_pipe(void) | |
3674 | { | |
3675 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3676 | } | |
3677 | ||
099e26bd DG |
3678 | /* |
3679 | * Create the application command pipe to wake thread_manage_apps. | |
3680 | */ | |
3681 | static int create_apps_cmd_pipe(void) | |
3682 | { | |
3683 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3684 | } | |
3685 | ||
d6f42150 | 3686 | /* |
d063d709 | 3687 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3688 | */ |
3689 | static int create_lttng_rundir(void) | |
3690 | { | |
3691 | int ret; | |
3692 | ||
3693 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3694 | if (ret < 0) { | |
b1f11e69 DG |
3695 | if (errno != EEXIST) { |
3696 | ERR("Unable to create " LTTNG_RUNDIR); | |
3697 | goto error; | |
3698 | } else { | |
3699 | ret = 0; | |
3700 | } | |
d6f42150 DG |
3701 | } |
3702 | ||
3703 | error: | |
3704 | return ret; | |
3705 | } | |
3706 | ||
3707 | /* | |
d063d709 DG |
3708 | * Setup sockets and directory needed by the kconsumerd communication with the |
3709 | * session daemon. | |
d6f42150 | 3710 | */ |
3bd1e081 | 3711 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
3712 | { |
3713 | int ret; | |
3bd1e081 MD |
3714 | const char *path = consumer_data->type == LTTNG_CONSUMER_KERNEL ? |
3715 | KCONSUMERD_PATH : USTCONSUMERD_PATH; | |
d6f42150 | 3716 | |
3bd1e081 MD |
3717 | if (strlen(consumer_data->err_unix_sock_path) == 0) { |
3718 | snprintf(consumer_data->err_unix_sock_path, PATH_MAX, | |
3719 | consumer_data->type == LTTNG_CONSUMER_KERNEL ? | |
3720 | KCONSUMERD_ERR_SOCK_PATH : | |
3721 | USTCONSUMERD_ERR_SOCK_PATH); | |
d6f42150 DG |
3722 | } |
3723 | ||
3bd1e081 MD |
3724 | if (strlen(consumer_data->cmd_unix_sock_path) == 0) { |
3725 | snprintf(consumer_data->cmd_unix_sock_path, PATH_MAX, | |
3726 | consumer_data->type == LTTNG_CONSUMER_KERNEL ? | |
3727 | KCONSUMERD_CMD_SOCK_PATH : | |
3728 | USTCONSUMERD_CMD_SOCK_PATH); | |
d6f42150 DG |
3729 | } |
3730 | ||
3bd1e081 | 3731 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 3732 | if (ret < 0) { |
6beb2242 | 3733 | if (errno != EEXIST) { |
3bd1e081 | 3734 | ERR("Failed to create %s", path); |
6beb2242 DG |
3735 | goto error; |
3736 | } | |
3737 | ret = 0; | |
d6f42150 DG |
3738 | } |
3739 | ||
3740 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3741 | consumer_data->err_sock = |
3742 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3743 | if (consumer_data->err_sock < 0) { | |
3744 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3745 | ret = -1; |
3746 | goto error; | |
3747 | } | |
3748 | ||
3749 | /* File permission MUST be 660 */ | |
3bd1e081 | 3750 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3751 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3752 | if (ret < 0) { |
3bd1e081 | 3753 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
d6f42150 DG |
3754 | perror("chmod"); |
3755 | goto error; | |
3756 | } | |
3757 | ||
3758 | error: | |
3759 | return ret; | |
3760 | } | |
3761 | ||
fac6795d | 3762 | /* |
d063d709 | 3763 | * Signal handler for the daemon |
cf3af59e | 3764 | * |
54d01ffb DG |
3765 | * Simply stop all worker threads, leaving main() return gracefully after |
3766 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3767 | */ |
3768 | static void sighandler(int sig) | |
3769 | { | |
3770 | switch (sig) { | |
cf3af59e MD |
3771 | case SIGPIPE: |
3772 | DBG("SIGPIPE catched"); | |
3773 | return; | |
3774 | case SIGINT: | |
3775 | DBG("SIGINT catched"); | |
3776 | stop_threads(); | |
3777 | break; | |
3778 | case SIGTERM: | |
3779 | DBG("SIGTERM catched"); | |
3780 | stop_threads(); | |
3781 | break; | |
3782 | default: | |
3783 | break; | |
fac6795d | 3784 | } |
fac6795d DG |
3785 | } |
3786 | ||
3787 | /* | |
d063d709 | 3788 | * Setup signal handler for : |
1d4b027a | 3789 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3790 | */ |
1d4b027a | 3791 | static int set_signal_handler(void) |
fac6795d | 3792 | { |
1d4b027a DG |
3793 | int ret = 0; |
3794 | struct sigaction sa; | |
3795 | sigset_t sigset; | |
fac6795d | 3796 | |
1d4b027a DG |
3797 | if ((ret = sigemptyset(&sigset)) < 0) { |
3798 | perror("sigemptyset"); | |
3799 | return ret; | |
3800 | } | |
d6f42150 | 3801 | |
1d4b027a DG |
3802 | sa.sa_handler = sighandler; |
3803 | sa.sa_mask = sigset; | |
3804 | sa.sa_flags = 0; | |
3805 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3806 | perror("sigaction"); | |
3807 | return ret; | |
d6f42150 DG |
3808 | } |
3809 | ||
1d4b027a DG |
3810 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3811 | perror("sigaction"); | |
3812 | return ret; | |
d6f42150 | 3813 | } |
aaf26714 | 3814 | |
1d4b027a DG |
3815 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3816 | perror("sigaction"); | |
3817 | return ret; | |
8c0faa1d DG |
3818 | } |
3819 | ||
1d4b027a DG |
3820 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3821 | ||
3822 | return ret; | |
fac6795d DG |
3823 | } |
3824 | ||
f3ed775e | 3825 | /* |
d063d709 DG |
3826 | * Set open files limit to unlimited. This daemon can open a large number of |
3827 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3828 | */ |
3829 | static void set_ulimit(void) | |
3830 | { | |
3831 | int ret; | |
3832 | struct rlimit lim; | |
3833 | ||
a88df331 | 3834 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3835 | lim.rlim_cur = 65535; |
3836 | lim.rlim_max = 65535; | |
3837 | ||
3838 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3839 | if (ret < 0) { | |
3840 | perror("failed to set open files limit"); | |
3841 | } | |
3842 | } | |
3843 | ||
fac6795d DG |
3844 | /* |
3845 | * main | |
3846 | */ | |
3847 | int main(int argc, char **argv) | |
3848 | { | |
fac6795d DG |
3849 | int ret = 0; |
3850 | void *status; | |
b082db07 | 3851 | const char *home_path; |
fac6795d | 3852 | |
f6a9efaa DG |
3853 | rcu_register_thread(); |
3854 | ||
273ea72c | 3855 | /* Create thread quit pipe */ |
cf3af59e MD |
3856 | if ((ret = init_thread_quit_pipe()) < 0) { |
3857 | goto error; | |
273ea72c DG |
3858 | } |
3859 | ||
fac6795d DG |
3860 | /* Parse arguments */ |
3861 | progname = argv[0]; | |
3862 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3863 | goto error; |
fac6795d DG |
3864 | } |
3865 | ||
3866 | /* Daemonize */ | |
3867 | if (opt_daemon) { | |
53094c05 DG |
3868 | ret = daemon(0, 0); |
3869 | if (ret < 0) { | |
3870 | perror("daemon"); | |
cf3af59e | 3871 | goto error; |
53094c05 | 3872 | } |
fac6795d DG |
3873 | } |
3874 | ||
3875 | /* Check if daemon is UID = 0 */ | |
3876 | is_root = !getuid(); | |
3877 | ||
fac6795d | 3878 | if (is_root) { |
d6f42150 DG |
3879 | ret = create_lttng_rundir(); |
3880 | if (ret < 0) { | |
cf3af59e | 3881 | goto error; |
d6f42150 DG |
3882 | } |
3883 | ||
fac6795d | 3884 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3885 | snprintf(apps_unix_sock_path, PATH_MAX, |
3886 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3887 | } |
3888 | ||
3889 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3890 | snprintf(client_unix_sock_path, PATH_MAX, |
3891 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3892 | } | |
0fdd1e2c DG |
3893 | |
3894 | /* Set global SHM for ust */ | |
3895 | if (strlen(wait_shm_path) == 0) { | |
3896 | snprintf(wait_shm_path, PATH_MAX, | |
3897 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3898 | } | |
fac6795d | 3899 | } else { |
b082db07 DG |
3900 | home_path = get_home_dir(); |
3901 | if (home_path == NULL) { | |
273ea72c DG |
3902 | /* TODO: Add --socket PATH option */ |
3903 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3904 | ret = -EPERM; |
3905 | goto error; | |
b082db07 DG |
3906 | } |
3907 | ||
fac6795d | 3908 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3909 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3910 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3911 | } |
3912 | ||
3913 | /* Set the cli tool unix socket path */ | |
3914 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3915 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3916 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3917 | } |
0fdd1e2c DG |
3918 | |
3919 | /* Set global SHM for ust */ | |
3920 | if (strlen(wait_shm_path) == 0) { | |
3921 | snprintf(wait_shm_path, PATH_MAX, | |
3922 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3923 | } | |
fac6795d DG |
3924 | } |
3925 | ||
847177cd DG |
3926 | DBG("Client socket path %s", client_unix_sock_path); |
3927 | DBG("Application socket path %s", apps_unix_sock_path); | |
3928 | ||
273ea72c | 3929 | /* |
7d8234d9 | 3930 | * See if daemon already exist. |
fac6795d | 3931 | */ |
7d8234d9 | 3932 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3933 | ERR("Already running daemon.\n"); |
273ea72c | 3934 | /* |
cf3af59e MD |
3935 | * We do not goto exit because we must not cleanup() |
3936 | * because a daemon is already running. | |
ab118b20 | 3937 | */ |
cf3af59e | 3938 | goto error; |
a88df331 DG |
3939 | } |
3940 | ||
54d01ffb | 3941 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
3942 | |
3943 | /* | |
3944 | * These actions must be executed as root. We do that *after* setting up | |
3945 | * the sockets path because we MUST make the check for another daemon using | |
3946 | * those paths *before* trying to set the kernel consumer sockets and init | |
3947 | * kernel tracer. | |
3948 | */ | |
3949 | if (is_root) { | |
3bd1e081 MD |
3950 | ret = set_consumer_sockets(&kconsumer_data); |
3951 | if (ret < 0) { | |
3952 | goto exit; | |
3953 | } | |
48842b30 | 3954 | |
3bd1e081 | 3955 | ret = set_consumer_sockets(&ustconsumer_data); |
a88df331 | 3956 | if (ret < 0) { |
cf3af59e | 3957 | goto exit; |
a88df331 | 3958 | } |
a88df331 DG |
3959 | /* Setup kernel tracer */ |
3960 | init_kernel_tracer(); | |
3961 | ||
3962 | /* Set ulimit for open files */ | |
3963 | set_ulimit(); | |
fac6795d DG |
3964 | } |
3965 | ||
cf3af59e MD |
3966 | if ((ret = set_signal_handler()) < 0) { |
3967 | goto exit; | |
fac6795d DG |
3968 | } |
3969 | ||
d6f42150 | 3970 | /* Setup the needed unix socket */ |
cf3af59e MD |
3971 | if ((ret = init_daemon_socket()) < 0) { |
3972 | goto exit; | |
fac6795d DG |
3973 | } |
3974 | ||
3975 | /* Set credentials to socket */ | |
cf3af59e MD |
3976 | if (is_root && ((ret = set_permissions()) < 0)) { |
3977 | goto exit; | |
fac6795d DG |
3978 | } |
3979 | ||
5b8719f5 DG |
3980 | /* Get parent pid if -S, --sig-parent is specified. */ |
3981 | if (opt_sig_parent) { | |
3982 | ppid = getppid(); | |
3983 | } | |
3984 | ||
7a485870 | 3985 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3986 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3987 | goto exit; | |
7a485870 DG |
3988 | } |
3989 | ||
099e26bd DG |
3990 | /* Setup the thread apps communication pipe. */ |
3991 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3992 | goto exit; | |
3993 | } | |
3994 | ||
3995 | /* Init UST command queue. */ | |
3996 | cds_wfq_init(&ust_cmd_queue.queue); | |
3997 | ||
f6a9efaa DG |
3998 | /* Init UST app hash table */ |
3999 | ust_app_ht_alloc(); | |
4000 | ||
273ea72c | 4001 | /* |
54d01ffb DG |
4002 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4003 | * statically declared in session.c | |
273ea72c | 4004 | */ |
54d01ffb | 4005 | session_list_ptr = session_get_list(); |
b5541356 | 4006 | |
5eb91c98 DG |
4007 | /* Set up max poll set size */ |
4008 | lttng_poll_set_max_size(); | |
4009 | ||
cf3af59e | 4010 | /* Create thread to manage the client socket */ |
099e26bd DG |
4011 | ret = pthread_create(&client_thread, NULL, |
4012 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4013 | if (ret != 0) { |
099e26bd | 4014 | perror("pthread_create clients"); |
cf3af59e MD |
4015 | goto exit_client; |
4016 | } | |
fac6795d | 4017 | |
099e26bd DG |
4018 | /* Create thread to dispatch registration */ |
4019 | ret = pthread_create(&dispatch_thread, NULL, | |
4020 | thread_dispatch_ust_registration, (void *) NULL); | |
4021 | if (ret != 0) { | |
4022 | perror("pthread_create dispatch"); | |
4023 | goto exit_dispatch; | |
4024 | } | |
4025 | ||
4026 | /* Create thread to manage application registration. */ | |
4027 | ret = pthread_create(®_apps_thread, NULL, | |
4028 | thread_registration_apps, (void *) NULL); | |
4029 | if (ret != 0) { | |
4030 | perror("pthread_create registration"); | |
4031 | goto exit_reg_apps; | |
4032 | } | |
4033 | ||
cf3af59e | 4034 | /* Create thread to manage application socket */ |
54d01ffb DG |
4035 | ret = pthread_create(&apps_thread, NULL, |
4036 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4037 | if (ret != 0) { |
099e26bd | 4038 | perror("pthread_create apps"); |
cf3af59e MD |
4039 | goto exit_apps; |
4040 | } | |
fac6795d | 4041 | |
cf3af59e | 4042 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4043 | ret = pthread_create(&kernel_thread, NULL, |
4044 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4045 | if (ret != 0) { |
099e26bd | 4046 | perror("pthread_create kernel"); |
cf3af59e MD |
4047 | goto exit_kernel; |
4048 | } | |
7a485870 | 4049 | |
cf3af59e MD |
4050 | ret = pthread_join(kernel_thread, &status); |
4051 | if (ret != 0) { | |
4052 | perror("pthread_join"); | |
4053 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4054 | } |
4055 | ||
cf3af59e MD |
4056 | exit_kernel: |
4057 | ret = pthread_join(apps_thread, &status); | |
4058 | if (ret != 0) { | |
4059 | perror("pthread_join"); | |
4060 | goto error; /* join error, exit without cleanup */ | |
4061 | } | |
fac6795d | 4062 | |
cf3af59e | 4063 | exit_apps: |
099e26bd DG |
4064 | ret = pthread_join(reg_apps_thread, &status); |
4065 | if (ret != 0) { | |
4066 | perror("pthread_join"); | |
4067 | goto error; /* join error, exit without cleanup */ | |
4068 | } | |
4069 | ||
4070 | exit_reg_apps: | |
4071 | ret = pthread_join(dispatch_thread, &status); | |
4072 | if (ret != 0) { | |
4073 | perror("pthread_join"); | |
4074 | goto error; /* join error, exit without cleanup */ | |
4075 | } | |
4076 | ||
4077 | exit_dispatch: | |
cf3af59e MD |
4078 | ret = pthread_join(client_thread, &status); |
4079 | if (ret != 0) { | |
4080 | perror("pthread_join"); | |
4081 | goto error; /* join error, exit without cleanup */ | |
4082 | } | |
4083 | ||
3bd1e081 | 4084 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4085 | if (ret != 0) { |
3bd1e081 | 4086 | perror("join_consumer"); |
cf3af59e MD |
4087 | goto error; /* join error, exit without cleanup */ |
4088 | } | |
a88df331 | 4089 | |
cf3af59e | 4090 | exit_client: |
a88df331 | 4091 | exit: |
cf3af59e MD |
4092 | /* |
4093 | * cleanup() is called when no other thread is running. | |
4094 | */ | |
f6a9efaa | 4095 | rcu_thread_online(); |
cf3af59e | 4096 | cleanup(); |
f6a9efaa DG |
4097 | rcu_thread_offline(); |
4098 | rcu_unregister_thread(); | |
cf3af59e MD |
4099 | if (!ret) |
4100 | exit(EXIT_SUCCESS); | |
4101 | error: | |
5e16da05 | 4102 | exit(EXIT_FAILURE); |
fac6795d | 4103 | } |