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