Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
3bd1e081 | 41 | #include <lttng-consumerd.h> |
e88129fc | 42 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 43 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 44 | |
1e307fab | 45 | #include <lttngerr.h> |
fac6795d | 46 | |
54d01ffb | 47 | #include "channel.h" |
5eb91c98 | 48 | #include "compat/poll.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
f6a9efaa | 52 | #include "hashtable.h" |
20fe2104 | 53 | #include "kernel-ctl.h" |
32258573 | 54 | #include "lttng-sessiond.h" |
0fdd1e2c | 55 | #include "shm.h" |
56fff090 | 56 | #include "ust-app.h" |
1e307fab | 57 | #include "ust-ctl.h" |
8e68d1c8 | 58 | #include "utils.h" |
fac6795d | 59 | |
3bd1e081 MD |
60 | struct consumer_data { |
61 | enum lttng_consumer_type type; | |
62 | ||
63 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
64 | sem_t sem; | |
65 | ||
66 | /* Mutex to control consumerd pid assignation */ | |
67 | pthread_mutex_t pid_mutex; | |
68 | pid_t pid; | |
69 | ||
70 | int err_sock; | |
71 | int cmd_sock; | |
72 | ||
73 | /* consumer error and command Unix socket path */ | |
74 | char err_unix_sock_path[PATH_MAX]; | |
75 | char cmd_unix_sock_path[PATH_MAX]; | |
76 | }; | |
77 | ||
75462a81 | 78 | /* Const values */ |
686204ab | 79 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 80 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
81 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
82 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
83 | ||
fac6795d | 84 | /* Variables */ |
1d4b027a | 85 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 86 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 87 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 88 | |
fac6795d DG |
89 | const char *progname; |
90 | const char *opt_tracing_group; | |
5b8719f5 | 91 | static int opt_sig_parent; |
fac6795d DG |
92 | static int opt_daemon; |
93 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a | 94 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
3bd1e081 MD |
95 | |
96 | /* Consumer daemon specific control data */ | |
97 | static struct consumer_data kconsumer_data = { | |
98 | .type = LTTNG_CONSUMER_KERNEL, | |
99 | }; | |
100 | static struct consumer_data ustconsumer_data = { | |
101 | .type = LTTNG_CONSUMER_UST, | |
102 | }; | |
103 | ||
099e26bd | 104 | static int dispatch_thread_exit; |
fac6795d | 105 | |
54d01ffb DG |
106 | /* Global application Unix socket path */ |
107 | static char apps_unix_sock_path[PATH_MAX]; | |
108 | /* Global client Unix socket path */ | |
109 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
110 | /* global wait shm path for UST */ |
111 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 112 | |
1d4b027a | 113 | /* Sockets and FDs */ |
d6f42150 DG |
114 | static int client_sock; |
115 | static int apps_sock; | |
20fe2104 | 116 | static int kernel_tracer_fd; |
7a485870 | 117 | static int kernel_poll_pipe[2]; |
1d4b027a | 118 | |
273ea72c DG |
119 | /* |
120 | * Quit pipe for all threads. This permits a single cancellation point | |
121 | * for all threads when receiving an event on the pipe. | |
122 | */ | |
123 | static int thread_quit_pipe[2]; | |
124 | ||
099e26bd DG |
125 | /* |
126 | * This pipe is used to inform the thread managing application communication | |
127 | * that a command is queued and ready to be processed. | |
128 | */ | |
129 | static int apps_cmd_pipe[2]; | |
130 | ||
1d4b027a | 131 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 132 | static pthread_t apps_thread; |
099e26bd | 133 | static pthread_t reg_apps_thread; |
1d4b027a | 134 | static pthread_t client_thread; |
7a485870 | 135 | static pthread_t kernel_thread; |
099e26bd | 136 | static pthread_t dispatch_thread; |
5eb91c98 | 137 | |
fac6795d | 138 | |
099e26bd DG |
139 | /* |
140 | * UST registration command queue. This queue is tied with a futex and uses a N | |
141 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
142 | * | |
143 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
144 | * this queue and the wait/wake scheme. | |
145 | */ | |
146 | static struct ust_cmd_queue ust_cmd_queue; | |
147 | ||
b5541356 DG |
148 | /* |
149 | * Pointer initialized before thread creation. | |
150 | * | |
151 | * This points to the tracing session list containing the session count and a | |
152 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
153 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 154 | * |
d063d709 | 155 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 156 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
157 | */ |
158 | static struct ltt_session_list *session_list_ptr; | |
159 | ||
ba5d816e MD |
160 | int ust_consumer_fd; |
161 | ||
5eb91c98 DG |
162 | /* |
163 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
164 | */ | |
165 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
166 | unsigned int size) | |
167 | { | |
168 | int ret; | |
169 | ||
170 | if (events == NULL || size == 0) { | |
171 | ret = -1; | |
172 | goto error; | |
173 | } | |
174 | ||
175 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
176 | if (ret < 0) { | |
177 | goto error; | |
178 | } | |
179 | ||
180 | /* Add quit pipe */ | |
181 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
182 | if (ret < 0) { | |
183 | goto error; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | ||
188 | error: | |
189 | return ret; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Check if the thread quit pipe was triggered. | |
194 | * | |
195 | * Return 1 if it was triggered else 0; | |
196 | */ | |
197 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
198 | { | |
199 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
200 | return 1; | |
201 | } | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
0fdd1e2c DG |
206 | /* |
207 | * Remove modules in reverse load order. | |
208 | */ | |
209 | static int modprobe_remove_kernel_modules(void) | |
210 | { | |
211 | int ret = 0, i; | |
212 | char modprobe[256]; | |
213 | ||
214 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
215 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 216 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
217 | kernel_modules_list[i].name); |
218 | if (ret < 0) { | |
24b487b8 | 219 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
220 | goto error; |
221 | } | |
222 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
223 | ret = system(modprobe); | |
224 | if (ret == -1) { | |
24b487b8 | 225 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
226 | kernel_modules_list[i].name); |
227 | } else if (kernel_modules_list[i].required | |
228 | && WEXITSTATUS(ret) != 0) { | |
229 | ERR("Unable to remove module %s", | |
230 | kernel_modules_list[i].name); | |
231 | } else { | |
232 | DBG("Modprobe removal successful %s", | |
233 | kernel_modules_list[i].name); | |
234 | } | |
235 | } | |
236 | ||
237 | error: | |
238 | return ret; | |
239 | } | |
240 | ||
241 | /* | |
242 | * Return group ID of the tracing group or -1 if not found. | |
243 | */ | |
996b65c8 MD |
244 | static gid_t allowed_group(void) |
245 | { | |
246 | struct group *grp; | |
247 | ||
274e143b MD |
248 | if (opt_tracing_group) { |
249 | grp = getgrnam(opt_tracing_group); | |
250 | } else { | |
251 | grp = getgrnam(default_tracing_group); | |
252 | } | |
996b65c8 MD |
253 | if (!grp) { |
254 | return -1; | |
255 | } else { | |
256 | return grp->gr_gid; | |
257 | } | |
258 | } | |
259 | ||
273ea72c | 260 | /* |
5eb91c98 | 261 | * Init thread quit pipe. |
273ea72c DG |
262 | * |
263 | * Return -1 on error or 0 if all pipes are created. | |
264 | */ | |
265 | static int init_thread_quit_pipe(void) | |
266 | { | |
267 | int ret; | |
268 | ||
269 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
270 | if (ret < 0) { | |
271 | perror("thread quit pipe"); | |
272 | goto error; | |
273 | } | |
274 | ||
275 | error: | |
276 | return ret; | |
277 | } | |
278 | ||
fac6795d | 279 | /* |
d063d709 DG |
280 | * Complete teardown of a kernel session. This free all data structure related |
281 | * to a kernel session and update counter. | |
fac6795d | 282 | */ |
1d4b027a | 283 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 284 | { |
1d4b027a DG |
285 | if (session->kernel_session != NULL) { |
286 | DBG("Tearing down kernel session"); | |
d9800920 DG |
287 | |
288 | /* | |
289 | * If a custom kernel consumer was registered, close the socket before | |
290 | * tearing down the complete kernel session structure | |
291 | */ | |
3bd1e081 | 292 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { |
d9800920 DG |
293 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
294 | } | |
295 | ||
62499ad6 | 296 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
297 | /* Extra precaution */ |
298 | session->kernel_session = NULL; | |
fac6795d | 299 | } |
fac6795d DG |
300 | } |
301 | ||
f6a9efaa DG |
302 | /* |
303 | * Complete teardown of all UST sessions. This will free everything on his path | |
304 | * and destroy the core essence of all ust sessions :) | |
305 | */ | |
306 | static void teardown_ust_session(struct ltt_session *session) | |
307 | { | |
84cd17c6 MD |
308 | int ret; |
309 | ||
f6a9efaa DG |
310 | DBG("Tearing down UST session(s)"); |
311 | ||
84cd17c6 MD |
312 | ret = ust_app_destroy_trace_all(session->ust_session); |
313 | if (ret) { | |
314 | ERR("Error in ust_app_destroy_trace_all"); | |
315 | } | |
f6a9efaa DG |
316 | trace_ust_destroy_session(session->ust_session); |
317 | } | |
318 | ||
099e26bd DG |
319 | /* |
320 | * Stop all threads by closing the thread quit pipe. | |
321 | */ | |
cf3af59e MD |
322 | static void stop_threads(void) |
323 | { | |
5eb91c98 DG |
324 | int ret; |
325 | ||
cf3af59e MD |
326 | /* Stopping all threads */ |
327 | DBG("Terminating all threads"); | |
54d01ffb | 328 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
329 | if (ret < 0) { |
330 | ERR("write error on thread quit pipe"); | |
331 | } | |
332 | ||
099e26bd DG |
333 | /* Dispatch thread */ |
334 | dispatch_thread_exit = 1; | |
335 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
336 | } |
337 | ||
fac6795d | 338 | /* |
d063d709 | 339 | * Cleanup the daemon |
fac6795d | 340 | */ |
cf3af59e | 341 | static void cleanup(void) |
fac6795d | 342 | { |
1d4b027a DG |
343 | int ret; |
344 | char *cmd; | |
af9737e9 | 345 | struct ltt_session *sess, *stmp; |
fac6795d | 346 | |
1d4b027a | 347 | DBG("Cleaning up"); |
e07ae692 | 348 | |
5eb91c98 DG |
349 | if (is_root) { |
350 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
351 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
352 | if (ret < 0) { | |
353 | ERR("asprintf failed. Something is really wrong!"); | |
354 | } | |
5461b305 | 355 | |
5eb91c98 DG |
356 | /* Remove lttng run directory */ |
357 | ret = system(cmd); | |
358 | if (ret < 0) { | |
359 | ERR("Unable to clean " LTTNG_RUNDIR); | |
360 | } | |
1d4b027a | 361 | } |
5461b305 | 362 | |
1d4b027a | 363 | DBG("Cleaning up all session"); |
fac6795d | 364 | |
b5541356 | 365 | /* Destroy session list mutex */ |
273ea72c DG |
366 | if (session_list_ptr != NULL) { |
367 | pthread_mutex_destroy(&session_list_ptr->lock); | |
368 | ||
369 | /* Cleanup ALL session */ | |
54d01ffb DG |
370 | cds_list_for_each_entry_safe(sess, stmp, |
371 | &session_list_ptr->head, list) { | |
273ea72c | 372 | teardown_kernel_session(sess); |
f6a9efaa DG |
373 | teardown_ust_session(sess); |
374 | free(sess); | |
273ea72c DG |
375 | } |
376 | } | |
377 | ||
099e26bd | 378 | DBG("Closing all UST sockets"); |
56fff090 | 379 | ust_app_clean_list(); |
099e26bd | 380 | |
3bd1e081 | 381 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 382 | |
f3ed775e | 383 | DBG("Closing kernel fd"); |
1d4b027a | 384 | close(kernel_tracer_fd); |
ab147185 | 385 | |
2f50c8a3 DG |
386 | if (is_root) { |
387 | DBG("Unloading kernel modules"); | |
388 | modprobe_remove_kernel_modules(); | |
389 | } | |
5eb91c98 DG |
390 | |
391 | close(thread_quit_pipe[0]); | |
392 | close(thread_quit_pipe[1]); | |
421cb601 DG |
393 | |
394 | /* <fun> */ | |
395 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
396 | "Matthew, BEET driven development works!%c[%dm", | |
397 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
398 | /* </fun> */ | |
fac6795d DG |
399 | } |
400 | ||
e065084a | 401 | /* |
d063d709 | 402 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 403 | * |
d063d709 | 404 | * Return lttcomm error code. |
e065084a DG |
405 | */ |
406 | static int send_unix_sock(int sock, void *buf, size_t len) | |
407 | { | |
408 | /* Check valid length */ | |
409 | if (len <= 0) { | |
410 | return -1; | |
411 | } | |
412 | ||
413 | return lttcomm_send_unix_sock(sock, buf, len); | |
414 | } | |
415 | ||
5461b305 | 416 | /* |
d063d709 | 417 | * Free memory of a command context structure. |
5461b305 | 418 | */ |
a2fb29a5 | 419 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 420 | { |
a2fb29a5 DG |
421 | DBG("Clean command context structure"); |
422 | if (*cmd_ctx) { | |
423 | if ((*cmd_ctx)->llm) { | |
424 | free((*cmd_ctx)->llm); | |
5461b305 | 425 | } |
a2fb29a5 DG |
426 | if ((*cmd_ctx)->lsm) { |
427 | free((*cmd_ctx)->lsm); | |
5461b305 | 428 | } |
a2fb29a5 DG |
429 | free(*cmd_ctx); |
430 | *cmd_ctx = NULL; | |
5461b305 DG |
431 | } |
432 | } | |
433 | ||
f3ed775e | 434 | /* |
d063d709 | 435 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 436 | */ |
2bdd86d4 | 437 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 438 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
439 | { |
440 | int ret; | |
f3ed775e | 441 | struct ltt_kernel_stream *stream; |
3bd1e081 | 442 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 443 | |
3bd1e081 | 444 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 445 | channel->channel->name); |
f3ed775e | 446 | |
3bd1e081 MD |
447 | /* Send channel */ |
448 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
449 | lkm.u.channel.channel_key = channel->fd; | |
450 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
451 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 452 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 453 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 454 | if (ret < 0) { |
3bd1e081 | 455 | perror("send consumer channel"); |
f3ed775e DG |
456 | goto error; |
457 | } | |
458 | ||
3bd1e081 | 459 | /* Send streams */ |
7a485870 | 460 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
461 | if (!stream->fd) { |
462 | continue; | |
463 | } | |
464 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
465 | lkm.u.stream.channel_key = channel->fd; | |
466 | lkm.u.stream.stream_key = stream->fd; | |
467 | lkm.u.stream.state = stream->state; | |
468 | lkm.u.stream.output = channel->channel->attr.output; | |
469 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
470 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
471 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
472 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
473 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
474 | if (ret < 0) { | |
475 | perror("send consumer stream"); | |
476 | goto error; | |
477 | } | |
478 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
479 | if (ret < 0) { | |
480 | perror("send consumer stream ancillary data"); | |
481 | goto error; | |
f3ed775e DG |
482 | } |
483 | } | |
484 | ||
3bd1e081 | 485 | DBG("consumer channel streams sent"); |
f3ed775e DG |
486 | |
487 | return 0; | |
488 | ||
489 | error: | |
490 | return ret; | |
491 | } | |
492 | ||
493 | /* | |
d063d709 | 494 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 495 | */ |
2bdd86d4 | 496 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 497 | struct ltt_kernel_session *session) |
f3ed775e DG |
498 | { |
499 | int ret; | |
500 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
501 | struct lttcomm_consumer_msg lkm; |
502 | int sock = session->consumer_fd; | |
7a485870 DG |
503 | |
504 | DBG("Sending metadata stream fd"); | |
505 | ||
2bdd86d4 | 506 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 507 | if (session->consumer_fd == 0) { |
3bd1e081 | 508 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
509 | } |
510 | ||
7a485870 | 511 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
512 | /* Send metadata channel fd */ |
513 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
514 | lkm.u.channel.channel_key = session->metadata->fd; | |
515 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
516 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
517 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
518 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
519 | if (ret < 0) { | |
520 | perror("send consumer channel"); | |
521 | goto error; | |
522 | } | |
523 | ||
524 | /* Send metadata stream fd */ | |
525 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
526 | lkm.u.stream.channel_key = session->metadata->fd; | |
527 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
528 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
529 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
530 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
531 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
532 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
533 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
534 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
535 | if (ret < 0) { | |
536 | perror("send consumer stream"); | |
537 | goto error; | |
538 | } | |
539 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 540 | if (ret < 0) { |
3bd1e081 | 541 | perror("send consumer stream"); |
7a485870 DG |
542 | goto error; |
543 | } | |
544 | } | |
f3ed775e | 545 | |
f3ed775e | 546 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 MD |
547 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
548 | if (ret < 0) { | |
549 | goto error; | |
550 | } | |
551 | } | |
552 | ||
553 | DBG("consumer fds (metadata and channel streams) sent"); | |
554 | ||
555 | return 0; | |
556 | ||
557 | error: | |
558 | return ret; | |
559 | } | |
560 | ||
fac6795d | 561 | /* |
0fdd1e2c | 562 | * Notify UST applications using the shm mmap futex. |
fac6795d | 563 | */ |
0fdd1e2c | 564 | static int notify_ust_apps(int active) |
fac6795d | 565 | { |
0fdd1e2c | 566 | char *wait_shm_mmap; |
fac6795d | 567 | |
0fdd1e2c | 568 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 569 | |
0fdd1e2c DG |
570 | /* See shm.c for this call implying mmap, shm and futex calls */ |
571 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
572 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
573 | goto error; |
574 | } | |
575 | ||
0fdd1e2c DG |
576 | /* Wake waiting process */ |
577 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
578 | ||
579 | /* Apps notified successfully */ | |
580 | return 0; | |
fac6795d DG |
581 | |
582 | error: | |
0fdd1e2c | 583 | return -1; |
fac6795d DG |
584 | } |
585 | ||
e065084a | 586 | /* |
d063d709 DG |
587 | * Setup the outgoing data buffer for the response (llm) by allocating the |
588 | * right amount of memory and copying the original information from the lsm | |
589 | * structure. | |
ca95a216 | 590 | * |
d063d709 | 591 | * Return total size of the buffer pointed by buf. |
ca95a216 | 592 | */ |
5461b305 | 593 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 594 | { |
f3ed775e | 595 | int ret, buf_size; |
ca95a216 | 596 | |
f3ed775e | 597 | buf_size = size; |
5461b305 | 598 | |
ba7f0ae5 | 599 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 600 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 601 | perror("zmalloc"); |
5461b305 | 602 | ret = -ENOMEM; |
ca95a216 DG |
603 | goto error; |
604 | } | |
605 | ||
5461b305 DG |
606 | /* Copy common data */ |
607 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 608 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 609 | |
5461b305 DG |
610 | cmd_ctx->llm->data_size = size; |
611 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
612 | ||
ca95a216 DG |
613 | return buf_size; |
614 | ||
615 | error: | |
616 | return ret; | |
617 | } | |
618 | ||
7a485870 | 619 | /* |
5eb91c98 | 620 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 621 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 622 | */ |
5eb91c98 | 623 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 624 | { |
5eb91c98 | 625 | int ret; |
7a485870 DG |
626 | struct ltt_session *session; |
627 | struct ltt_kernel_channel *channel; | |
628 | ||
5eb91c98 | 629 | DBG("Updating kernel poll set"); |
7a485870 | 630 | |
54d01ffb | 631 | session_lock_list(); |
b5541356 | 632 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 633 | session_lock(session); |
7a485870 | 634 | if (session->kernel_session == NULL) { |
54d01ffb | 635 | session_unlock(session); |
7a485870 DG |
636 | continue; |
637 | } | |
7a485870 | 638 | |
54d01ffb DG |
639 | cds_list_for_each_entry(channel, |
640 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
641 | /* Add channel fd to the kernel poll set */ |
642 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
643 | if (ret < 0) { | |
54d01ffb | 644 | session_unlock(session); |
5eb91c98 DG |
645 | goto error; |
646 | } | |
647 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 648 | } |
54d01ffb | 649 | session_unlock(session); |
7a485870 | 650 | } |
54d01ffb | 651 | session_unlock_list(); |
7a485870 | 652 | |
5eb91c98 | 653 | return 0; |
7a485870 DG |
654 | |
655 | error: | |
54d01ffb | 656 | session_unlock_list(); |
7a485870 DG |
657 | return -1; |
658 | } | |
659 | ||
660 | /* | |
54d01ffb | 661 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 662 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 663 | * |
d063d709 | 664 | * Useful for CPU hotplug feature. |
7a485870 | 665 | */ |
2bdd86d4 | 666 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
667 | { |
668 | int ret = 0; | |
669 | struct ltt_session *session; | |
670 | struct ltt_kernel_channel *channel; | |
671 | ||
672 | DBG("Updating kernel streams for channel fd %d", fd); | |
673 | ||
54d01ffb | 674 | session_lock_list(); |
b5541356 | 675 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 676 | session_lock(session); |
7a485870 | 677 | if (session->kernel_session == NULL) { |
54d01ffb | 678 | session_unlock(session); |
7a485870 DG |
679 | continue; |
680 | } | |
d9800920 DG |
681 | |
682 | /* This is not suppose to be 0 but this is an extra security check */ | |
683 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 684 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
685 | } |
686 | ||
5eb91c98 DG |
687 | cds_list_for_each_entry(channel, |
688 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
689 | if (channel->fd == fd) { |
690 | DBG("Channel found, updating kernel streams"); | |
691 | ret = kernel_open_channel_stream(channel); | |
692 | if (ret < 0) { | |
b3c750d2 | 693 | goto error; |
7a485870 | 694 | } |
d9800920 | 695 | |
7a485870 | 696 | /* |
5eb91c98 DG |
697 | * Have we already sent fds to the consumer? If yes, it means |
698 | * that tracing is started so it is safe to send our updated | |
699 | * stream fds. | |
7a485870 | 700 | */ |
3bd1e081 | 701 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 702 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 703 | session->kernel_session->consumer_fd, channel); |
7a485870 | 704 | if (ret < 0) { |
b3c750d2 | 705 | goto error; |
7a485870 DG |
706 | } |
707 | } | |
b3c750d2 | 708 | goto error; |
7a485870 DG |
709 | } |
710 | } | |
54d01ffb | 711 | session_unlock(session); |
7a485870 | 712 | } |
54d01ffb | 713 | session_unlock_list(); |
b3c750d2 | 714 | return ret; |
7a485870 | 715 | |
b3c750d2 | 716 | error: |
54d01ffb DG |
717 | session_unlock(session); |
718 | session_unlock_list(); | |
7a485870 DG |
719 | return ret; |
720 | } | |
721 | ||
487cf67c DG |
722 | /* |
723 | * For each tracing session, update newly registered apps. | |
724 | */ | |
725 | static void update_ust_app(int app_sock) | |
726 | { | |
727 | struct ltt_session *sess, *stmp; | |
728 | ||
729 | /* For all tracing session(s) */ | |
730 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
731 | if (sess->ust_session) { |
732 | ust_app_global_update(sess->ust_session, app_sock); | |
733 | } | |
487cf67c DG |
734 | } |
735 | } | |
736 | ||
7a485870 | 737 | /* |
d063d709 | 738 | * This thread manage event coming from the kernel. |
7a485870 | 739 | * |
d063d709 DG |
740 | * Features supported in this thread: |
741 | * -) CPU Hotplug | |
7a485870 DG |
742 | */ |
743 | static void *thread_manage_kernel(void *data) | |
744 | { | |
5eb91c98 DG |
745 | int ret, i, pollfd, update_poll_flag = 1; |
746 | uint32_t revents, nb_fd; | |
7a485870 | 747 | char tmp; |
5eb91c98 | 748 | struct lttng_poll_event events; |
7a485870 DG |
749 | |
750 | DBG("Thread manage kernel started"); | |
751 | ||
5eb91c98 DG |
752 | ret = create_thread_poll_set(&events, 2); |
753 | if (ret < 0) { | |
754 | goto error; | |
755 | } | |
756 | ||
757 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
758 | if (ret < 0) { | |
759 | goto error; | |
760 | } | |
761 | ||
7a485870 DG |
762 | while (1) { |
763 | if (update_poll_flag == 1) { | |
5f822d0a DG |
764 | /* |
765 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
766 | * quit pipe and the kernel pipe. | |
767 | */ | |
768 | events.nb_fd = 2; | |
769 | ||
5eb91c98 DG |
770 | ret = update_kernel_poll(&events); |
771 | if (ret < 0) { | |
7a485870 DG |
772 | goto error; |
773 | } | |
774 | update_poll_flag = 0; | |
775 | } | |
776 | ||
5eb91c98 DG |
777 | nb_fd = LTTNG_POLL_GETNB(&events); |
778 | ||
779 | DBG("Thread kernel polling on %d fds", nb_fd); | |
780 | ||
781 | /* Zeroed the poll events */ | |
782 | lttng_poll_reset(&events); | |
7a485870 DG |
783 | |
784 | /* Poll infinite value of time */ | |
5eb91c98 | 785 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 786 | if (ret < 0) { |
7a485870 DG |
787 | goto error; |
788 | } else if (ret == 0) { | |
789 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
790 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
791 | "This should not have happened! Continuing..."); | |
7a485870 DG |
792 | continue; |
793 | } | |
794 | ||
5eb91c98 DG |
795 | for (i = 0; i < nb_fd; i++) { |
796 | /* Fetch once the poll data */ | |
797 | revents = LTTNG_POLL_GETEV(&events, i); | |
798 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 799 | |
5eb91c98 DG |
800 | /* Thread quit pipe has been closed. Killing thread. */ |
801 | ret = check_thread_quit_pipe(pollfd, revents); | |
802 | if (ret) { | |
803 | goto error; | |
804 | } | |
7a485870 | 805 | |
5eb91c98 DG |
806 | /* Check for data on kernel pipe */ |
807 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
808 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
809 | update_poll_flag = 1; | |
810 | continue; | |
811 | } else { | |
812 | /* | |
813 | * New CPU detected by the kernel. Adding kernel stream to | |
814 | * kernel session and updating the kernel consumer | |
815 | */ | |
816 | if (revents & LPOLLIN) { | |
2bdd86d4 | 817 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
818 | if (ret < 0) { |
819 | continue; | |
820 | } | |
821 | break; | |
822 | /* | |
823 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
824 | * and unregister kernel stream at this point. | |
825 | */ | |
7a485870 | 826 | } |
7a485870 DG |
827 | } |
828 | } | |
829 | } | |
830 | ||
831 | error: | |
832 | DBG("Kernel thread dying"); | |
273ea72c DG |
833 | close(kernel_poll_pipe[0]); |
834 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
835 | |
836 | lttng_poll_clean(&events); | |
837 | ||
7a485870 DG |
838 | return NULL; |
839 | } | |
840 | ||
1d4b027a | 841 | /* |
3bd1e081 | 842 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 843 | */ |
3bd1e081 | 844 | static void *thread_manage_consumer(void *data) |
1d4b027a | 845 | { |
5eb91c98 DG |
846 | int sock = 0, i, ret, pollfd; |
847 | uint32_t revents, nb_fd; | |
1d4b027a | 848 | enum lttcomm_return_code code; |
5eb91c98 | 849 | struct lttng_poll_event events; |
3bd1e081 | 850 | struct consumer_data *consumer_data = data; |
1d4b027a | 851 | |
3bd1e081 | 852 | DBG("[thread] Manage consumer started"); |
1d4b027a | 853 | |
3bd1e081 | 854 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
855 | if (ret < 0) { |
856 | goto error; | |
857 | } | |
858 | ||
5eb91c98 DG |
859 | /* |
860 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
861 | * Nothing more will be added to this poll set. | |
862 | */ | |
863 | ret = create_thread_poll_set(&events, 2); | |
864 | if (ret < 0) { | |
865 | goto error; | |
866 | } | |
273ea72c | 867 | |
3bd1e081 | 868 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
869 | if (ret < 0) { |
870 | goto error; | |
871 | } | |
872 | ||
873 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
874 | |
875 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 876 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 877 | if (ret < 0) { |
273ea72c DG |
878 | goto error; |
879 | } | |
880 | ||
5eb91c98 DG |
881 | for (i = 0; i < nb_fd; i++) { |
882 | /* Fetch once the poll data */ | |
883 | revents = LTTNG_POLL_GETEV(&events, i); | |
884 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
885 | ||
886 | /* Thread quit pipe has been closed. Killing thread. */ | |
887 | ret = check_thread_quit_pipe(pollfd, revents); | |
888 | if (ret) { | |
889 | goto error; | |
890 | } | |
891 | ||
892 | /* Event on the registration socket */ | |
3bd1e081 | 893 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 894 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 895 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
896 | goto error; |
897 | } | |
898 | } | |
273ea72c DG |
899 | } |
900 | ||
3bd1e081 | 901 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
902 | if (sock < 0) { |
903 | goto error; | |
904 | } | |
905 | ||
3bd1e081 | 906 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 907 | |
712ea556 | 908 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
909 | ret = lttcomm_recv_unix_sock(sock, &code, |
910 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
911 | if (ret <= 0) { |
912 | goto error; | |
913 | } | |
914 | ||
3bd1e081 MD |
915 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
916 | consumer_data->cmd_sock = | |
917 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
918 | if (consumer_data->cmd_sock < 0) { | |
919 | sem_post(&consumer_data->sem); | |
48842b30 | 920 | PERROR("consumer connect"); |
1d4b027a DG |
921 | goto error; |
922 | } | |
923 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
924 | sem_post(&consumer_data->sem); |
925 | DBG("consumer command socket ready"); | |
1d4b027a | 926 | } else { |
3bd1e081 | 927 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
928 | lttcomm_get_readable_code(-code)); |
929 | goto error; | |
930 | } | |
931 | ||
54d01ffb | 932 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 933 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 934 | if (ret < 0) { |
72079cae DG |
935 | goto error; |
936 | } | |
937 | ||
5eb91c98 DG |
938 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
939 | if (ret < 0) { | |
72079cae | 940 | goto error; |
5eb91c98 DG |
941 | } |
942 | ||
943 | /* Update number of fd */ | |
944 | nb_fd = LTTNG_POLL_GETNB(&events); | |
945 | ||
946 | /* Inifinite blocking call, waiting for transmission */ | |
947 | ret = lttng_poll_wait(&events, -1); | |
948 | if (ret < 0) { | |
72079cae DG |
949 | goto error; |
950 | } | |
951 | ||
5eb91c98 DG |
952 | for (i = 0; i < nb_fd; i++) { |
953 | /* Fetch once the poll data */ | |
954 | revents = LTTNG_POLL_GETEV(&events, i); | |
955 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
956 | ||
957 | /* Thread quit pipe has been closed. Killing thread. */ | |
958 | ret = check_thread_quit_pipe(pollfd, revents); | |
959 | if (ret) { | |
960 | goto error; | |
961 | } | |
962 | ||
963 | /* Event on the kconsumerd socket */ | |
964 | if (pollfd == sock) { | |
965 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 966 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
967 | goto error; |
968 | } | |
969 | } | |
970 | } | |
971 | ||
712ea556 | 972 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
973 | ret = lttcomm_recv_unix_sock(sock, &code, |
974 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 975 | if (ret <= 0) { |
3bd1e081 | 976 | ERR("consumer closed the command socket"); |
712ea556 | 977 | goto error; |
6f61d021 | 978 | } |
1d4b027a | 979 | |
3bd1e081 | 980 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 981 | |
1d4b027a | 982 | error: |
3bd1e081 MD |
983 | DBG("consumer thread dying"); |
984 | close(consumer_data->err_sock); | |
985 | close(consumer_data->cmd_sock); | |
5eb91c98 | 986 | close(sock); |
273ea72c | 987 | |
3bd1e081 MD |
988 | unlink(consumer_data->err_unix_sock_path); |
989 | unlink(consumer_data->cmd_unix_sock_path); | |
990 | consumer_data->pid = 0; | |
1d4b027a | 991 | |
5eb91c98 | 992 | lttng_poll_clean(&events); |
0177d773 | 993 | |
5eb91c98 | 994 | return NULL; |
099e26bd DG |
995 | } |
996 | ||
099e26bd DG |
997 | /* |
998 | * This thread manage application communication. | |
1d4b027a DG |
999 | */ |
1000 | static void *thread_manage_apps(void *data) | |
099e26bd | 1001 | { |
5eb91c98 DG |
1002 | int i, ret, pollfd; |
1003 | uint32_t revents, nb_fd; | |
099e26bd | 1004 | struct ust_command ust_cmd; |
5eb91c98 | 1005 | struct lttng_poll_event events; |
099e26bd DG |
1006 | |
1007 | DBG("[thread] Manage application started"); | |
1008 | ||
f6a9efaa DG |
1009 | rcu_register_thread(); |
1010 | rcu_thread_online(); | |
1011 | ||
5eb91c98 DG |
1012 | ret = create_thread_poll_set(&events, 2); |
1013 | if (ret < 0) { | |
1014 | goto error; | |
1015 | } | |
099e26bd | 1016 | |
5eb91c98 DG |
1017 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1018 | if (ret < 0) { | |
1019 | goto error; | |
1020 | } | |
099e26bd | 1021 | |
5eb91c98 DG |
1022 | while (1) { |
1023 | /* Zeroed the events structure */ | |
1024 | lttng_poll_reset(&events); | |
0177d773 | 1025 | |
5eb91c98 | 1026 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1027 | |
1028 | DBG("Apps thread polling on %d fds", nb_fd); | |
1029 | ||
1030 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1031 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1032 | if (ret < 0) { |
099e26bd DG |
1033 | goto error; |
1034 | } | |
1035 | ||
5eb91c98 DG |
1036 | for (i = 0; i < nb_fd; i++) { |
1037 | /* Fetch once the poll data */ | |
1038 | revents = LTTNG_POLL_GETEV(&events, i); | |
1039 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1040 | ||
1041 | /* Thread quit pipe has been closed. Killing thread. */ | |
1042 | ret = check_thread_quit_pipe(pollfd, revents); | |
1043 | if (ret) { | |
099e26bd | 1044 | goto error; |
5eb91c98 | 1045 | } |
099e26bd | 1046 | |
5eb91c98 DG |
1047 | /* Inspect the apps cmd pipe */ |
1048 | if (pollfd == apps_cmd_pipe[0]) { | |
1049 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1050 | ERR("Apps command pipe error"); | |
0177d773 | 1051 | goto error; |
5eb91c98 DG |
1052 | } else if (revents & LPOLLIN) { |
1053 | /* Empty pipe */ | |
1054 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1055 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1056 | perror("read apps cmd pipe"); | |
1057 | goto error; | |
1058 | } | |
099e26bd | 1059 | |
5eb91c98 | 1060 | /* Register applicaton to the session daemon */ |
56fff090 | 1061 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1062 | ust_cmd.sock); |
88ff5b7f | 1063 | if (ret == -ENOMEM) { |
5eb91c98 | 1064 | goto error; |
88ff5b7f MD |
1065 | } else if (ret < 0) { |
1066 | break; | |
5eb91c98 DG |
1067 | } |
1068 | ||
acc7b41b MD |
1069 | /* |
1070 | * Add channel(s) and event(s) to newly registered apps | |
1071 | * from lttng global UST domain. | |
1072 | */ | |
1073 | update_ust_app(ust_cmd.sock); | |
1074 | ||
5eb91c98 DG |
1075 | ret = ustctl_register_done(ust_cmd.sock); |
1076 | if (ret < 0) { | |
1077 | /* | |
1078 | * If the registration is not possible, we simply | |
1079 | * unregister the apps and continue | |
1080 | */ | |
56fff090 | 1081 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1082 | } else { |
1083 | /* | |
1084 | * We just need here to monitor the close of the UST | |
1085 | * socket and poll set monitor those by default. | |
1086 | */ | |
1087 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1088 | if (ret < 0) { | |
1089 | goto error; | |
1090 | } | |
1091 | ||
54d01ffb DG |
1092 | DBG("Apps with sock %d added to poll set", |
1093 | ust_cmd.sock); | |
5eb91c98 | 1094 | } |
487cf67c | 1095 | |
5eb91c98 | 1096 | break; |
0177d773 | 1097 | } |
5eb91c98 DG |
1098 | } else { |
1099 | /* | |
54d01ffb DG |
1100 | * At this point, we know that a registered application made |
1101 | * the event at poll_wait. | |
5eb91c98 DG |
1102 | */ |
1103 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1104 | /* Removing from the poll set */ | |
1105 | ret = lttng_poll_del(&events, pollfd); | |
1106 | if (ret < 0) { | |
1107 | goto error; | |
1108 | } | |
099e26bd | 1109 | |
b9d9b220 | 1110 | /* Socket closed on remote end. */ |
56fff090 | 1111 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1112 | break; |
1113 | } | |
099e26bd DG |
1114 | } |
1115 | } | |
099e26bd DG |
1116 | } |
1117 | ||
1118 | error: | |
1119 | DBG("Application communication apps dying"); | |
1120 | close(apps_cmd_pipe[0]); | |
1121 | close(apps_cmd_pipe[1]); | |
1122 | ||
5eb91c98 | 1123 | lttng_poll_clean(&events); |
099e26bd | 1124 | |
f6a9efaa DG |
1125 | rcu_thread_offline(); |
1126 | rcu_unregister_thread(); | |
099e26bd DG |
1127 | return NULL; |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * Dispatch request from the registration threads to the application | |
1132 | * communication thread. | |
1133 | */ | |
1134 | static void *thread_dispatch_ust_registration(void *data) | |
1135 | { | |
1136 | int ret; | |
1137 | struct cds_wfq_node *node; | |
1138 | struct ust_command *ust_cmd = NULL; | |
1139 | ||
1140 | DBG("[thread] Dispatch UST command started"); | |
1141 | ||
1142 | while (!dispatch_thread_exit) { | |
1143 | /* Atomically prepare the queue futex */ | |
1144 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1145 | ||
1146 | do { | |
1147 | /* Dequeue command for registration */ | |
1148 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1149 | if (node == NULL) { | |
00a17c97 | 1150 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1151 | /* Continue thread execution */ |
1152 | break; | |
1153 | } | |
1154 | ||
1155 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1156 | ||
2f50c8a3 DG |
1157 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1158 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1159 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1160 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1161 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1162 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1163 | /* |
1164 | * Inform apps thread of the new application registration. This | |
1165 | * call is blocking so we can be assured that the data will be read | |
1166 | * at some point in time or wait to the end of the world :) | |
1167 | */ | |
1168 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1169 | sizeof(struct ust_command)); | |
1170 | if (ret < 0) { | |
1171 | perror("write apps cmd pipe"); | |
1172 | if (errno == EBADF) { | |
1173 | /* | |
1174 | * We can't inform the application thread to process | |
1175 | * registration. We will exit or else application | |
1176 | * registration will not occur and tracing will never | |
1177 | * start. | |
1178 | */ | |
1179 | goto error; | |
1180 | } | |
1181 | } | |
1182 | free(ust_cmd); | |
1183 | } while (node != NULL); | |
1184 | ||
1185 | /* Futex wait on queue. Blocking call on futex() */ | |
1186 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1187 | } | |
1188 | ||
1189 | error: | |
1190 | DBG("Dispatch thread dying"); | |
1191 | return NULL; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * This thread manage application registration. | |
1196 | */ | |
1197 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1198 | { |
5eb91c98 DG |
1199 | int sock = 0, i, ret, pollfd; |
1200 | uint32_t revents, nb_fd; | |
1201 | struct lttng_poll_event events; | |
099e26bd DG |
1202 | /* |
1203 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1204 | * freed in the manage apps thread. | |
1205 | */ | |
1206 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1207 | |
099e26bd | 1208 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1209 | |
1210 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1211 | if (ret < 0) { | |
1212 | goto error; | |
1213 | } | |
1214 | ||
5eb91c98 DG |
1215 | /* |
1216 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1217 | * more will be added to this poll set. | |
1218 | */ | |
1219 | ret = create_thread_poll_set(&events, 2); | |
1220 | if (ret < 0) { | |
1221 | goto error; | |
1222 | } | |
273ea72c | 1223 | |
5eb91c98 DG |
1224 | /* Add the application registration socket */ |
1225 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1226 | if (ret < 0) { | |
1227 | goto error; | |
1228 | } | |
273ea72c | 1229 | |
1d4b027a | 1230 | /* Notify all applications to register */ |
0fdd1e2c DG |
1231 | ret = notify_ust_apps(1); |
1232 | if (ret < 0) { | |
1233 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1234 | "Execution continues but there might be problem for already\n" |
1235 | "running applications that wishes to register."); | |
0fdd1e2c | 1236 | } |
1d4b027a DG |
1237 | |
1238 | while (1) { | |
1239 | DBG("Accepting application registration"); | |
273ea72c | 1240 | |
5eb91c98 DG |
1241 | nb_fd = LTTNG_POLL_GETNB(&events); |
1242 | ||
273ea72c | 1243 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1244 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1245 | if (ret < 0) { |
273ea72c DG |
1246 | goto error; |
1247 | } | |
1248 | ||
5eb91c98 DG |
1249 | for (i = 0; i < nb_fd; i++) { |
1250 | /* Fetch once the poll data */ | |
1251 | revents = LTTNG_POLL_GETEV(&events, i); | |
1252 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1253 | |
5eb91c98 DG |
1254 | /* Thread quit pipe has been closed. Killing thread. */ |
1255 | ret = check_thread_quit_pipe(pollfd, revents); | |
1256 | if (ret) { | |
90014c57 DG |
1257 | goto error; |
1258 | } | |
1d4b027a | 1259 | |
5eb91c98 DG |
1260 | /* Event on the registration socket */ |
1261 | if (pollfd == apps_sock) { | |
1262 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1263 | ERR("Register apps socket poll error"); | |
1264 | goto error; | |
1265 | } else if (revents & LPOLLIN) { | |
1266 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1267 | if (sock < 0) { | |
1268 | goto error; | |
1269 | } | |
099e26bd | 1270 | |
5eb91c98 | 1271 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1272 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1273 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1274 | perror("ust command zmalloc"); |
5eb91c98 DG |
1275 | goto error; |
1276 | } | |
1d4b027a | 1277 | |
5eb91c98 DG |
1278 | /* |
1279 | * Using message-based transmissions to ensure we don't | |
1280 | * have to deal with partially received messages. | |
1281 | */ | |
1282 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1283 | sizeof(struct ust_register_msg)); | |
1284 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1285 | if (ret < 0) { | |
1286 | perror("lttcomm_recv_unix_sock register apps"); | |
1287 | } else { | |
1288 | ERR("Wrong size received on apps register"); | |
1289 | } | |
1290 | free(ust_cmd); | |
1291 | close(sock); | |
1292 | continue; | |
1293 | } | |
099e26bd | 1294 | |
5eb91c98 | 1295 | ust_cmd->sock = sock; |
099e26bd | 1296 | |
5eb91c98 DG |
1297 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1298 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1299 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1300 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1301 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1302 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1303 | |
5eb91c98 DG |
1304 | /* |
1305 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1306 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1307 | */ |
1308 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1309 | ||
1310 | /* | |
1311 | * Wake the registration queue futex. Implicit memory | |
1312 | * barrier with the exchange in cds_wfq_enqueue. | |
1313 | */ | |
1314 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1315 | } | |
1316 | } | |
90014c57 | 1317 | } |
1d4b027a DG |
1318 | } |
1319 | ||
1320 | error: | |
0fdd1e2c DG |
1321 | DBG("UST Registration thread dying"); |
1322 | ||
1323 | /* Notify that the registration thread is gone */ | |
1324 | notify_ust_apps(0); | |
1325 | ||
1326 | close(apps_sock); | |
1327 | close(sock); | |
273ea72c | 1328 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1329 | |
5eb91c98 DG |
1330 | lttng_poll_clean(&events); |
1331 | ||
1d4b027a DG |
1332 | return NULL; |
1333 | } | |
1334 | ||
8c0faa1d | 1335 | /* |
3bd1e081 | 1336 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1337 | * exec or it will fails. |
8c0faa1d | 1338 | */ |
3bd1e081 | 1339 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1340 | { |
1341 | int ret; | |
ee0b0061 DG |
1342 | struct timespec timeout; |
1343 | ||
1344 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1345 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1346 | |
1347 | /* Setup semaphore */ | |
3bd1e081 | 1348 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1349 | if (ret < 0) { |
3bd1e081 | 1350 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1351 | goto error; |
1352 | } | |
8c0faa1d | 1353 | |
3bd1e081 MD |
1354 | ret = pthread_create(&consumer_data->thread, NULL, |
1355 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1356 | if (ret != 0) { |
3bd1e081 | 1357 | PERROR("pthread_create consumer"); |
ee0b0061 | 1358 | ret = -1; |
8c0faa1d DG |
1359 | goto error; |
1360 | } | |
1361 | ||
ee0b0061 DG |
1362 | /* Get time for sem_timedwait absolute timeout */ |
1363 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1364 | if (ret < 0) { | |
3bd1e081 | 1365 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1366 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1367 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1368 | } else { |
1369 | /* Normal timeout if the gettime was successful */ | |
1370 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1371 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1372 | } |
8c0faa1d | 1373 | |
ee0b0061 DG |
1374 | if (ret < 0) { |
1375 | if (errno == ETIMEDOUT) { | |
1376 | /* | |
1377 | * Call has timed out so we kill the kconsumerd_thread and return | |
1378 | * an error. | |
1379 | */ | |
3bd1e081 MD |
1380 | ERR("The consumer thread was never ready. Killing it"); |
1381 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1382 | if (ret < 0) { |
3bd1e081 | 1383 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1384 | } |
1385 | } else { | |
3bd1e081 | 1386 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1387 | } |
1388 | goto error; | |
1389 | } | |
1390 | ||
3bd1e081 MD |
1391 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1392 | if (consumer_data->pid == 0) { | |
712ea556 | 1393 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1394 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1395 | goto error; |
1396 | } | |
3bd1e081 | 1397 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1398 | |
8c0faa1d DG |
1399 | return 0; |
1400 | ||
1401 | error: | |
1402 | return ret; | |
1403 | } | |
1404 | ||
d9800920 | 1405 | /* |
3bd1e081 | 1406 | * Join consumer thread |
d9800920 | 1407 | */ |
3bd1e081 | 1408 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1409 | { |
1410 | void *status; | |
1411 | int ret; | |
1412 | ||
3bd1e081 MD |
1413 | if (consumer_data->pid != 0) { |
1414 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1415 | if (ret) { |
3bd1e081 | 1416 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1417 | return ret; |
1418 | } | |
3bd1e081 | 1419 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1420 | } else { |
1421 | return 0; | |
1422 | } | |
1423 | } | |
1424 | ||
8c0faa1d | 1425 | /* |
3bd1e081 | 1426 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1427 | * |
d063d709 | 1428 | * Return pid if successful else -1. |
8c0faa1d | 1429 | */ |
3bd1e081 | 1430 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1431 | { |
1432 | int ret; | |
1433 | pid_t pid; | |
53086306 | 1434 | const char *verbosity; |
8c0faa1d | 1435 | |
3bd1e081 | 1436 | DBG("Spawning consumerd"); |
c49dc785 | 1437 | |
8c0faa1d DG |
1438 | pid = fork(); |
1439 | if (pid == 0) { | |
1440 | /* | |
3bd1e081 | 1441 | * Exec consumerd. |
8c0faa1d | 1442 | */ |
3bd1e081 | 1443 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1444 | verbosity = "--verbose"; |
1445 | } else { | |
1446 | verbosity = "--quiet"; | |
1447 | } | |
3bd1e081 MD |
1448 | switch (consumer_data->type) { |
1449 | case LTTNG_CONSUMER_KERNEL: | |
1450 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
1451 | "lttng-consumerd", verbosity, "-k", NULL); | |
1452 | break; | |
1453 | case LTTNG_CONSUMER_UST: | |
1454 | execl(INSTALL_BIN_PATH "/lttng-consumerd", | |
1455 | "lttng-consumerd", verbosity, "-u", NULL); | |
1456 | break; | |
1457 | default: | |
1458 | perror("unknown consumer type"); | |
1459 | exit(EXIT_FAILURE); | |
1460 | } | |
8c0faa1d DG |
1461 | if (errno != 0) { |
1462 | perror("kernel start consumer exec"); | |
1463 | } | |
1464 | exit(EXIT_FAILURE); | |
1465 | } else if (pid > 0) { | |
1466 | ret = pid; | |
8c0faa1d | 1467 | } else { |
3bd1e081 | 1468 | perror("start consumer fork"); |
8c0faa1d | 1469 | ret = -errno; |
8c0faa1d | 1470 | } |
8c0faa1d DG |
1471 | return ret; |
1472 | } | |
1473 | ||
693bd40b | 1474 | /* |
3bd1e081 | 1475 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1476 | */ |
3bd1e081 | 1477 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1478 | { |
1479 | int ret; | |
1480 | ||
3bd1e081 MD |
1481 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1482 | if (consumer_data->pid != 0) { | |
1483 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1484 | goto end; |
1485 | } | |
693bd40b | 1486 | |
3bd1e081 | 1487 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1488 | if (ret < 0) { |
3bd1e081 MD |
1489 | ERR("Spawning consumerd failed"); |
1490 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1491 | goto error; |
693bd40b | 1492 | } |
c49dc785 | 1493 | |
3bd1e081 MD |
1494 | /* Setting up the consumer_data pid */ |
1495 | consumer_data->pid = ret; | |
48842b30 | 1496 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1497 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1498 | |
3bd1e081 MD |
1499 | DBG2("Spawning consumer control thread"); |
1500 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1501 | if (ret < 0) { |
3bd1e081 | 1502 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1503 | goto error; |
1504 | } | |
1505 | ||
c49dc785 | 1506 | end: |
693bd40b DG |
1507 | return 0; |
1508 | ||
1509 | error: | |
1510 | return ret; | |
1511 | } | |
1512 | ||
b73401da | 1513 | /* |
d063d709 | 1514 | * modprobe_kernel_modules |
b73401da DG |
1515 | */ |
1516 | static int modprobe_kernel_modules(void) | |
1517 | { | |
ab147185 | 1518 | int ret = 0, i; |
b73401da DG |
1519 | char modprobe[256]; |
1520 | ||
ab147185 MD |
1521 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1522 | ret = snprintf(modprobe, sizeof(modprobe), | |
1523 | "/sbin/modprobe %s%s", | |
24b487b8 | 1524 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1525 | kernel_modules_list[i].name); |
b73401da DG |
1526 | if (ret < 0) { |
1527 | perror("snprintf modprobe"); | |
1528 | goto error; | |
1529 | } | |
ab147185 | 1530 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1531 | ret = system(modprobe); |
ab147185 MD |
1532 | if (ret == -1) { |
1533 | ERR("Unable to launch modprobe for module %s", | |
1534 | kernel_modules_list[i].name); | |
1535 | } else if (kernel_modules_list[i].required | |
d9800920 | 1536 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1537 | ERR("Unable to load module %s", |
1538 | kernel_modules_list[i].name); | |
1539 | } else { | |
1540 | DBG("Modprobe successfully %s", | |
1541 | kernel_modules_list[i].name); | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | error: | |
1546 | return ret; | |
1547 | } | |
1548 | ||
b73401da | 1549 | /* |
d063d709 | 1550 | * mount_debugfs |
b73401da DG |
1551 | */ |
1552 | static int mount_debugfs(char *path) | |
1553 | { | |
1554 | int ret; | |
1555 | char *type = "debugfs"; | |
1556 | ||
996b65c8 | 1557 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1558 | if (ret < 0) { |
7272acf5 | 1559 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1560 | goto error; |
1561 | } | |
1562 | ||
1563 | ret = mount(type, path, type, 0, NULL); | |
1564 | if (ret < 0) { | |
7272acf5 | 1565 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1566 | goto error; |
1567 | } | |
1568 | ||
1569 | DBG("Mounted debugfs successfully at %s", path); | |
1570 | ||
1571 | error: | |
1572 | return ret; | |
1573 | } | |
1574 | ||
8c0faa1d | 1575 | /* |
d063d709 | 1576 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1577 | */ |
f3ed775e | 1578 | static void init_kernel_tracer(void) |
8c0faa1d | 1579 | { |
b73401da DG |
1580 | int ret; |
1581 | char *proc_mounts = "/proc/mounts"; | |
1582 | char line[256]; | |
684d34d2 | 1583 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1584 | FILE *fp; |
1585 | ||
1586 | /* Detect debugfs */ | |
1587 | fp = fopen(proc_mounts, "r"); | |
1588 | if (fp == NULL) { | |
1589 | ERR("Unable to probe %s", proc_mounts); | |
1590 | goto error; | |
1591 | } | |
1592 | ||
1593 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1594 | if (strstr(line, "debugfs") != NULL) { | |
1595 | /* Remove first string */ | |
1596 | strtok(line, " "); | |
1597 | /* Dup string here so we can reuse line later on */ | |
1598 | debugfs_path = strdup(strtok(NULL, " ")); | |
1599 | DBG("Got debugfs path : %s", debugfs_path); | |
1600 | break; | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | fclose(fp); | |
1605 | ||
1606 | /* Mount debugfs if needded */ | |
1607 | if (debugfs_path == NULL) { | |
1608 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1609 | if (ret < 0) { | |
1610 | perror("asprintf debugfs path"); | |
1611 | goto error; | |
1612 | } | |
1613 | ret = mount_debugfs(debugfs_path); | |
1614 | if (ret < 0) { | |
7272acf5 | 1615 | perror("Cannot mount debugfs"); |
b73401da DG |
1616 | goto error; |
1617 | } | |
1618 | } | |
1619 | ||
1620 | /* Modprobe lttng kernel modules */ | |
1621 | ret = modprobe_kernel_modules(); | |
1622 | if (ret < 0) { | |
1623 | goto error; | |
1624 | } | |
1625 | ||
1626 | /* Setup lttng kernel path */ | |
1627 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1628 | if (ret < 0) { | |
1629 | perror("asprintf lttng path"); | |
1630 | goto error; | |
1631 | } | |
1632 | ||
1633 | /* Open debugfs lttng */ | |
1634 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1635 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1636 | DBG("Failed to open %s", lttng_path); |
1637 | goto error; | |
8c0faa1d DG |
1638 | } |
1639 | ||
b73401da DG |
1640 | free(lttng_path); |
1641 | free(debugfs_path); | |
f3ed775e | 1642 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1643 | return; |
1644 | ||
1645 | error: | |
1646 | if (lttng_path) { | |
1647 | free(lttng_path); | |
1648 | } | |
1649 | if (debugfs_path) { | |
1650 | free(debugfs_path); | |
1651 | } | |
1652 | WARN("No kernel tracer available"); | |
1653 | kernel_tracer_fd = 0; | |
1654 | return; | |
f3ed775e | 1655 | } |
33a2b854 | 1656 | |
f3ed775e | 1657 | /* |
54d01ffb | 1658 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1659 | */ |
54d01ffb | 1660 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1661 | { |
f40799e8 | 1662 | int ret = 0; |
8c0faa1d | 1663 | |
3bd1e081 | 1664 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1665 | /* |
54d01ffb DG |
1666 | * Assign default kernel consumer socket if no consumer assigned to the |
1667 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1668 | * an extra security check. | |
d9800920 DG |
1669 | */ |
1670 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1671 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1672 | } |
1673 | ||
2bdd86d4 | 1674 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1675 | if (ret < 0) { |
f3ed775e DG |
1676 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1677 | goto error; | |
1678 | } | |
1d4b027a | 1679 | |
3bd1e081 | 1680 | session->consumer_fds_sent = 1; |
f3ed775e | 1681 | } |
1d4b027a DG |
1682 | |
1683 | error: | |
1684 | return ret; | |
8c0faa1d DG |
1685 | } |
1686 | ||
0177d773 DG |
1687 | /* |
1688 | * Create an UST session and add it to the session ust list. | |
1689 | */ | |
44d3bd01 DG |
1690 | static int create_ust_session(struct ltt_session *session, |
1691 | struct lttng_domain *domain) | |
0177d773 | 1692 | { |
44d3bd01 | 1693 | int ret; |
48842b30 | 1694 | unsigned int uid; |
13384287 | 1695 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1696 | |
1697 | switch (domain->type) { | |
48842b30 | 1698 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1699 | break; |
1700 | default: | |
13384287 | 1701 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1702 | goto error; |
1703 | } | |
0177d773 DG |
1704 | |
1705 | DBG("Creating UST session"); | |
1706 | ||
48842b30 DG |
1707 | session_lock_list(); |
1708 | uid = session_list_ptr->count; | |
1709 | session_unlock_list(); | |
1710 | ||
1711 | lus = trace_ust_create_session(session->path, uid, domain); | |
0177d773 | 1712 | if (lus == NULL) { |
44d3bd01 | 1713 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1714 | goto error; |
1715 | } | |
1716 | ||
48842b30 | 1717 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
0177d773 DG |
1718 | geteuid(), allowed_group()); |
1719 | if (ret < 0) { | |
1720 | if (ret != -EEXIST) { | |
1721 | ERR("Trace directory creation error"); | |
44d3bd01 | 1722 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1723 | goto error; |
1724 | } | |
1725 | } | |
1726 | ||
f6a9efaa DG |
1727 | /* The domain type dictate different actions on session creation */ |
1728 | switch (domain->type) { | |
48842b30 DG |
1729 | case LTTNG_DOMAIN_UST: |
1730 | /* No ustctl for the global UST domain */ | |
1731 | break; | |
1732 | default: | |
36dc12cc | 1733 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1734 | goto error; |
0177d773 | 1735 | } |
f6a9efaa | 1736 | session->ust_session = lus; |
44d3bd01 DG |
1737 | |
1738 | return LTTCOMM_OK; | |
0177d773 DG |
1739 | |
1740 | error: | |
1741 | free(lus); | |
1742 | return ret; | |
1743 | } | |
1744 | ||
333f285e | 1745 | /* |
d063d709 | 1746 | * Create a kernel tracer session then create the default channel. |
333f285e | 1747 | */ |
f3ed775e | 1748 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1749 | { |
f3ed775e | 1750 | int ret; |
f3ed775e DG |
1751 | |
1752 | DBG("Creating kernel session"); | |
1753 | ||
1754 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1755 | if (ret < 0) { | |
1756 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1757 | goto error; | |
333f285e DG |
1758 | } |
1759 | ||
d9800920 | 1760 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1761 | if (kconsumer_data.cmd_sock) { |
1762 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1763 | } |
1764 | ||
63053e7c DG |
1765 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1766 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1767 | if (ret < 0) { |
996b65c8 | 1768 | if (ret != -EEXIST) { |
7a485870 DG |
1769 | ERR("Trace directory creation error"); |
1770 | goto error; | |
1771 | } | |
1772 | } | |
1773 | ||
f3ed775e DG |
1774 | error: |
1775 | return ret; | |
333f285e DG |
1776 | } |
1777 | ||
6c9cc2ab DG |
1778 | /* |
1779 | * Using the session list, filled a lttng_session array to send back to the | |
1780 | * client for session listing. | |
1781 | * | |
1782 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1783 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1784 | */ |
1785 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1786 | { | |
1787 | int i = 0; | |
1788 | struct ltt_session *session; | |
1789 | ||
1790 | DBG("Getting all available session"); | |
1791 | /* | |
1792 | * Iterate over session list and append data after the control struct in | |
1793 | * the buffer. | |
1794 | */ | |
1795 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1796 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1797 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1798 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1799 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 1800 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
1801 | i++; |
1802 | } | |
1803 | } | |
1804 | ||
9f19cc17 DG |
1805 | /* |
1806 | * Fill lttng_channel array of all channels. | |
1807 | */ | |
b551a063 | 1808 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
1809 | struct lttng_channel *channels) |
1810 | { | |
1811 | int i = 0; | |
1812 | struct ltt_kernel_channel *kchan; | |
1813 | ||
1814 | DBG("Listing channels for session %s", session->name); | |
1815 | ||
b551a063 DG |
1816 | switch (domain) { |
1817 | case LTTNG_DOMAIN_KERNEL: | |
1818 | /* Kernel channels */ | |
1819 | if (session->kernel_session != NULL) { | |
1820 | cds_list_for_each_entry(kchan, | |
1821 | &session->kernel_session->channel_list.head, list) { | |
1822 | /* Copy lttng_channel struct to array */ | |
1823 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1824 | channels[i].enabled = kchan->enabled; | |
1825 | i++; | |
1826 | } | |
1827 | } | |
1828 | break; | |
1829 | case LTTNG_DOMAIN_UST: | |
1830 | { | |
1831 | struct cds_lfht_iter iter; | |
1832 | struct ltt_ust_channel *uchan; | |
1833 | ||
1834 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
1835 | &iter, uchan, node) { | |
1836 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
1837 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
1838 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
1839 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
1840 | channels[i].attr.switch_timer_interval = | |
1841 | uchan->attr.switch_timer_interval; | |
1842 | channels[i].attr.read_timer_interval = | |
1843 | uchan->attr.read_timer_interval; | |
1844 | channels[i].attr.output = uchan->attr.output; | |
1845 | } | |
1846 | break; | |
1847 | } | |
1848 | default: | |
1849 | break; | |
1850 | } | |
1851 | } | |
1852 | ||
1853 | /* | |
1854 | * Create a list of ust global domain events. | |
1855 | */ | |
1856 | static int list_lttng_ust_global_events(char *channel_name, | |
1857 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
1858 | { | |
1859 | int i = 0, ret = 0; | |
1860 | unsigned int nb_event = 0; | |
1861 | struct cds_lfht_iter iter; | |
1862 | struct ltt_ust_channel *uchan; | |
1863 | struct ltt_ust_event *uevent; | |
1864 | struct lttng_event *tmp; | |
1865 | ||
1866 | DBG("Listing UST global events for channel %s", channel_name); | |
1867 | ||
1868 | rcu_read_lock(); | |
1869 | ||
1870 | /* Count events in all channels */ | |
1871 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1872 | nb_event += hashtable_get_count(uchan->events); | |
1873 | } | |
1874 | ||
1875 | if (nb_event == 0) { | |
1876 | ret = nb_event; | |
1877 | goto error; | |
1878 | } | |
1879 | ||
1880 | DBG3("Listing UST global %d events", nb_event); | |
1881 | ||
1882 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1883 | if (tmp == NULL) { | |
1884 | ret = -LTTCOMM_FATAL; | |
1885 | goto error; | |
1886 | } | |
1887 | ||
1888 | cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) { | |
1889 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { | |
1890 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
1891 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
37357452 | 1892 | tmp[i].enabled = uevent->enabled; |
b551a063 DG |
1893 | switch (uevent->attr.instrumentation) { |
1894 | case LTTNG_UST_TRACEPOINT: | |
1895 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
1896 | break; | |
1897 | case LTTNG_UST_PROBE: | |
1898 | tmp[i].type = LTTNG_EVENT_PROBE; | |
1899 | break; | |
1900 | case LTTNG_UST_FUNCTION: | |
1901 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
1902 | break; | |
1903 | } | |
9f19cc17 DG |
1904 | i++; |
1905 | } | |
1906 | } | |
1907 | ||
b551a063 DG |
1908 | ret = nb_event; |
1909 | *events = tmp; | |
1910 | ||
1911 | error: | |
1912 | rcu_read_unlock(); | |
1913 | return ret; | |
9f19cc17 DG |
1914 | } |
1915 | ||
1916 | /* | |
b551a063 | 1917 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 1918 | */ |
b551a063 DG |
1919 | static int list_lttng_kernel_events(char *channel_name, |
1920 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 1921 | { |
b551a063 DG |
1922 | int i = 0, ret; |
1923 | unsigned int nb_event; | |
9f19cc17 | 1924 | struct ltt_kernel_event *event; |
b551a063 DG |
1925 | struct ltt_kernel_channel *kchan; |
1926 | ||
1927 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
1928 | if (kchan == NULL) { | |
1929 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1930 | goto error; | |
1931 | } | |
1932 | ||
1933 | nb_event = kchan->event_count; | |
9f19cc17 DG |
1934 | |
1935 | DBG("Listing events for channel %s", kchan->channel->name); | |
1936 | ||
b551a063 DG |
1937 | if (nb_event == 0) { |
1938 | ret = nb_event; | |
1939 | goto error; | |
1940 | } | |
1941 | ||
1942 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
1943 | if (*events == NULL) { | |
1944 | ret = LTTCOMM_FATAL; | |
1945 | goto error; | |
1946 | } | |
1947 | ||
9f19cc17 DG |
1948 | /* Kernel channels */ |
1949 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
1950 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
1951 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
1952 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
1953 | switch (event->event->instrumentation) { |
1954 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 1955 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
1956 | break; |
1957 | case LTTNG_KERNEL_KPROBE: | |
1958 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
1959 | (*events)[i].type = LTTNG_EVENT_PROBE; |
1960 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
1961 | sizeof(struct lttng_kernel_kprobe)); |
1962 | break; | |
1963 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
1964 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
1965 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
1966 | sizeof(struct lttng_kernel_function)); |
1967 | break; | |
0133c199 | 1968 | case LTTNG_KERNEL_NOOP: |
b551a063 | 1969 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 1970 | break; |
a54bd42d | 1971 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 1972 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 1973 | break; |
7a3d1328 MD |
1974 | case LTTNG_KERNEL_ALL: |
1975 | assert(0); | |
1976 | break; | |
9f19cc17 DG |
1977 | } |
1978 | i++; | |
1979 | } | |
b551a063 DG |
1980 | |
1981 | return nb_event; | |
1982 | ||
1983 | error: | |
1984 | return ret; | |
9f19cc17 DG |
1985 | } |
1986 | ||
fac6795d | 1987 | /* |
54d01ffb | 1988 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 1989 | */ |
54d01ffb DG |
1990 | static int cmd_disable_channel(struct ltt_session *session, |
1991 | int domain, char *channel_name) | |
fac6795d | 1992 | { |
54d01ffb | 1993 | int ret; |
379473d2 | 1994 | |
54d01ffb DG |
1995 | switch (domain) { |
1996 | case LTTNG_DOMAIN_KERNEL: | |
1997 | ret = channel_kernel_disable(session->kernel_session, | |
1998 | channel_name); | |
1999 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
2000 | goto error; |
2001 | } | |
54d01ffb DG |
2002 | |
2003 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c | 2004 | break; |
44d3bd01 DG |
2005 | case LTTNG_DOMAIN_UST_PID: |
2006 | break; | |
d0254c7c | 2007 | default: |
44d3bd01 | 2008 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
54d01ffb | 2009 | goto error; |
20fe2104 DG |
2010 | } |
2011 | ||
54d01ffb | 2012 | ret = LTTCOMM_OK; |
d65106b1 | 2013 | |
54d01ffb DG |
2014 | error: |
2015 | return ret; | |
2016 | } | |
2017 | ||
56fff090 DG |
2018 | /* |
2019 | * Copy channel from attributes and set it in the application channel list. | |
2020 | */ | |
f6a9efaa | 2021 | /* |
56fff090 DG |
2022 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
2023 | struct lttng_channel *attr, struct ust_app *app) | |
2024 | { | |
2025 | int ret; | |
2026 | struct ltt_ust_channel *uchan, *new_chan; | |
2027 | ||
f6a9efaa | 2028 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
56fff090 DG |
2029 | if (uchan == NULL) { |
2030 | ret = LTTCOMM_FATAL; | |
2031 | goto error; | |
2032 | } | |
2033 | ||
2034 | new_chan = trace_ust_create_channel(attr, usess->path); | |
2035 | if (new_chan == NULL) { | |
2036 | PERROR("malloc ltt_ust_channel"); | |
2037 | ret = LTTCOMM_FATAL; | |
2038 | goto error; | |
2039 | } | |
2040 | ||
2041 | ret = channel_ust_copy(new_chan, uchan); | |
2042 | if (ret < 0) { | |
2043 | ret = LTTCOMM_FATAL; | |
2044 | goto error; | |
2045 | } | |
2046 | ||
56fff090 DG |
2047 | error: |
2048 | return ret; | |
2049 | } | |
f6a9efaa | 2050 | */ |
56fff090 | 2051 | |
54d01ffb DG |
2052 | /* |
2053 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2054 | */ | |
44d3bd01 DG |
2055 | static int cmd_enable_channel(struct ltt_session *session, |
2056 | struct lttng_domain *domain, struct lttng_channel *attr) | |
54d01ffb DG |
2057 | { |
2058 | int ret; | |
f6a9efaa DG |
2059 | struct ltt_ust_session *usess = session->ust_session; |
2060 | ||
5d56b5aa | 2061 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2062 | |
44d3bd01 DG |
2063 | switch (domain->type) { |
2064 | case LTTNG_DOMAIN_KERNEL: | |
2065 | { | |
2066 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2067 | |
44d3bd01 DG |
2068 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2069 | session->kernel_session); | |
2070 | if (kchan == NULL) { | |
2071 | ret = channel_kernel_create(session->kernel_session, | |
2072 | attr, kernel_poll_pipe[1]); | |
2073 | } else { | |
2074 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2075 | } | |
2076 | ||
2077 | if (ret != LTTCOMM_OK) { | |
2078 | goto error; | |
2079 | } | |
2080 | ||
2081 | kernel_wait_quiescent(kernel_tracer_fd); | |
2082 | break; | |
2083 | } | |
f6a9efaa DG |
2084 | case LTTNG_DOMAIN_UST: |
2085 | { | |
2086 | struct ltt_ust_channel *uchan; | |
2087 | ||
48842b30 | 2088 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
f6a9efaa | 2089 | |
48842b30 | 2090 | /* Get channel in global UST domain HT */ |
f6a9efaa DG |
2091 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2092 | attr->name); | |
2093 | if (uchan == NULL) { | |
48842b30 | 2094 | uchan = trace_ust_create_channel(attr, usess->pathname); |
f6a9efaa DG |
2095 | if (uchan == NULL) { |
2096 | ret = LTTCOMM_UST_CHAN_FAIL; | |
2097 | goto error; | |
2098 | } | |
d5cd1f34 | 2099 | |
f6a9efaa DG |
2100 | rcu_read_lock(); |
2101 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); | |
2102 | rcu_read_unlock(); | |
48842b30 | 2103 | DBG2("UST channel %s added to global domain HT", attr->name); |
f6a9efaa DG |
2104 | } else { |
2105 | ret = LTTCOMM_UST_CHAN_EXIST; | |
2106 | goto error; | |
2107 | } | |
2108 | ||
421cb601 | 2109 | /* Add channel to all registered applications */ |
5b4a0ec0 | 2110 | ret = ust_app_create_channel_all(usess, uchan); |
509cbaf8 | 2111 | if (ret != 0) { |
48842b30 DG |
2112 | goto error; |
2113 | } | |
f6a9efaa | 2114 | |
37357452 DG |
2115 | uchan->enabled = 1; |
2116 | ||
f6a9efaa DG |
2117 | break; |
2118 | } | |
44d3bd01 DG |
2119 | case LTTNG_DOMAIN_UST_PID: |
2120 | { | |
f6a9efaa | 2121 | /* |
56fff090 DG |
2122 | int sock; |
2123 | struct ltt_ust_channel *uchan; | |
44d3bd01 | 2124 | struct ltt_ust_session *usess; |
56fff090 | 2125 | struct ust_app *app; |
44d3bd01 DG |
2126 | |
2127 | usess = trace_ust_get_session_by_pid(&session->ust_session_list, | |
2128 | domain->attr.pid); | |
2129 | if (usess == NULL) { | |
2130 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2131 | goto error; | |
2132 | } | |
2133 | ||
56fff090 | 2134 | app = ust_app_get_by_pid(domain->attr.pid); |
44d3bd01 DG |
2135 | if (app == NULL) { |
2136 | ret = LTTCOMM_APP_NOT_FOUND; | |
2137 | goto error; | |
2138 | } | |
56fff090 | 2139 | sock = app->sock; |
44d3bd01 DG |
2140 | |
2141 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
2142 | if (uchan == NULL) { | |
56fff090 | 2143 | ret = channel_ust_create(usess, attr, sock); |
44d3bd01 | 2144 | } else { |
56fff090 | 2145 | ret = channel_ust_enable(usess, uchan, sock); |
44d3bd01 DG |
2146 | } |
2147 | ||
2148 | if (ret != LTTCOMM_OK) { | |
2149 | goto error; | |
2150 | } | |
2151 | ||
56fff090 DG |
2152 | ret = copy_ust_channel_to_app(usess, attr, app); |
2153 | if (ret != LTTCOMM_OK) { | |
44d3bd01 DG |
2154 | goto error; |
2155 | } | |
2156 | ||
44d3bd01 DG |
2157 | DBG("UST channel %s created for app sock %d with pid %d", |
2158 | attr->name, app->sock, domain->attr.pid); | |
f6a9efaa DG |
2159 | */ |
2160 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2161 | goto error; | |
44d3bd01 DG |
2162 | } |
2163 | default: | |
2164 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2165 | goto error; | |
54d01ffb DG |
2166 | } |
2167 | ||
2168 | ret = LTTCOMM_OK; | |
2169 | ||
2170 | error: | |
2171 | return ret; | |
2172 | } | |
2173 | ||
2174 | /* | |
2175 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2176 | */ | |
2177 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2178 | char *channel_name, char *event_name) | |
2179 | { | |
2180 | int ret; | |
54d01ffb DG |
2181 | |
2182 | switch (domain) { | |
2183 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2184 | { |
2185 | struct ltt_kernel_channel *kchan; | |
2186 | ||
54d01ffb DG |
2187 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2188 | session->kernel_session); | |
2189 | if (kchan == NULL) { | |
2190 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2191 | goto error; | |
d65106b1 DG |
2192 | } |
2193 | ||
7a3d1328 | 2194 | ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name); |
54d01ffb DG |
2195 | if (ret != LTTCOMM_OK) { |
2196 | goto error; | |
2197 | } | |
2198 | ||
2199 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2200 | break; |
2bdd86d4 MD |
2201 | } |
2202 | case LTTNG_DOMAIN_UST: | |
2bdd86d4 MD |
2203 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2204 | case LTTNG_DOMAIN_UST_PID: | |
2205 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2206 | default: |
2bdd86d4 | 2207 | /* TODO: Other UST domains */ |
54d01ffb DG |
2208 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2209 | goto error; | |
d65106b1 | 2210 | } |
26cc6b4e | 2211 | |
54d01ffb DG |
2212 | ret = LTTCOMM_OK; |
2213 | ||
2214 | error: | |
2215 | return ret; | |
2216 | } | |
2217 | ||
2218 | /* | |
2219 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2220 | */ | |
2221 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2222 | char *channel_name) | |
2223 | { | |
2224 | int ret; | |
2225 | struct ltt_kernel_channel *kchan; | |
2226 | ||
2227 | switch (domain) { | |
2228 | case LTTNG_DOMAIN_KERNEL: | |
2229 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2230 | session->kernel_session); | |
2231 | if (kchan == NULL) { | |
2232 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2233 | goto error; | |
26cc6b4e DG |
2234 | } |
2235 | ||
54d01ffb DG |
2236 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
2237 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 2238 | goto error; |
26cc6b4e DG |
2239 | } |
2240 | ||
54d01ffb | 2241 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2242 | break; |
54d01ffb DG |
2243 | default: |
2244 | /* TODO: Userspace tracing */ | |
2245 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2246 | goto error; | |
26cc6b4e | 2247 | } |
e953ef25 | 2248 | |
54d01ffb | 2249 | ret = LTTCOMM_OK; |
e953ef25 | 2250 | |
54d01ffb DG |
2251 | error: |
2252 | return ret; | |
2253 | } | |
f5177a38 | 2254 | |
54d01ffb DG |
2255 | /* |
2256 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2257 | */ | |
2258 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2259 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2260 | { | |
2261 | int ret; | |
f5177a38 | 2262 | |
54d01ffb DG |
2263 | switch (domain) { |
2264 | case LTTNG_DOMAIN_KERNEL: | |
2265 | /* Add kernel context to kernel tracer */ | |
2266 | ret = context_kernel_add(session->kernel_session, ctx, | |
2267 | event_name, channel_name); | |
2268 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2269 | goto error; |
e953ef25 | 2270 | } |
2bdd86d4 MD |
2271 | break; |
2272 | case LTTNG_DOMAIN_UST: | |
2273 | { | |
48842b30 DG |
2274 | /* |
2275 | struct ltt_ust_session *usess; | |
e953ef25 | 2276 | |
48842b30 DG |
2277 | cds_list_for_each_entry(usess, &session->ust_session_list.head, list) { |
2278 | ret = context_ust_add(usess, ctx, | |
2279 | event_name, channel_name, domain); | |
2bdd86d4 MD |
2280 | if (ret != LTTCOMM_OK) { |
2281 | goto error; | |
2282 | } | |
2283 | } | |
e953ef25 | 2284 | break; |
48842b30 | 2285 | */ |
2bdd86d4 | 2286 | } |
54d01ffb | 2287 | default: |
2bdd86d4 | 2288 | /* TODO: UST other domains */ |
54d01ffb DG |
2289 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2290 | goto error; | |
e953ef25 | 2291 | } |
950131af | 2292 | |
54d01ffb | 2293 | ret = LTTCOMM_OK; |
950131af | 2294 | |
54d01ffb DG |
2295 | error: |
2296 | return ret; | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
2301 | */ | |
2302 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2303 | char *channel_name, struct lttng_event *event) | |
2304 | { | |
2305 | int ret; | |
f6cd6b0f | 2306 | struct lttng_channel *attr; |
48842b30 | 2307 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2308 | |
2309 | switch (domain) { | |
2310 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2311 | { |
2312 | struct ltt_kernel_channel *kchan; | |
2313 | ||
54d01ffb DG |
2314 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2315 | session->kernel_session); | |
2316 | if (kchan == NULL) { | |
f6cd6b0f DG |
2317 | attr = channel_new_default_attr(domain); |
2318 | if (attr == NULL) { | |
2319 | ret = LTTCOMM_FATAL; | |
2320 | goto error; | |
2321 | } | |
2322 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2323 | ||
54d01ffb | 2324 | /* This call will notify the kernel thread */ |
44d3bd01 | 2325 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2326 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2327 | if (ret != LTTCOMM_OK) { |
f5177a38 DG |
2328 | goto error; |
2329 | } | |
54d01ffb | 2330 | } |
950131af | 2331 | |
54d01ffb DG |
2332 | /* Get the newly created kernel channel pointer */ |
2333 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2334 | session->kernel_session); | |
2335 | if (kchan == NULL) { | |
2336 | /* This sould not happen... */ | |
2337 | ret = LTTCOMM_FATAL; | |
2338 | goto error; | |
2339 | } | |
f5177a38 | 2340 | |
48842b30 DG |
2341 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2342 | event); | |
54d01ffb | 2343 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2344 | goto error; |
950131af DG |
2345 | } |
2346 | ||
54d01ffb | 2347 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2348 | break; |
2bdd86d4 MD |
2349 | } |
2350 | case LTTNG_DOMAIN_UST: | |
2351 | { | |
48842b30 DG |
2352 | struct ltt_ust_channel *uchan; |
2353 | struct ltt_ust_event *uevent; | |
2bdd86d4 | 2354 | |
48842b30 DG |
2355 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2356 | channel_name); | |
2357 | if (uchan == NULL) { | |
2358 | /* TODO: Create default channel */ | |
2359 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2360 | goto error; | |
2361 | } | |
2bdd86d4 | 2362 | |
48842b30 DG |
2363 | uevent = trace_ust_find_event_by_name(uchan->events, event->name); |
2364 | if (uevent == NULL) { | |
2365 | uevent = trace_ust_create_event(event); | |
2366 | if (uevent == NULL) { | |
2bdd86d4 MD |
2367 | ret = LTTCOMM_FATAL; |
2368 | goto error; | |
2369 | } | |
d5cd1f34 | 2370 | |
48842b30 | 2371 | } |
2bdd86d4 | 2372 | |
5b4a0ec0 | 2373 | ret = ust_app_create_event_all(usess, uchan, uevent); |
48842b30 DG |
2374 | if (ret < 0) { |
2375 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2376 | goto error; | |
2bdd86d4 | 2377 | } |
487cf67c | 2378 | |
d5cd1f34 | 2379 | /* Add ltt ust event to channel */ |
487cf67c DG |
2380 | rcu_read_lock(); |
2381 | hashtable_add_unique(uchan->events, &uevent->node); | |
2382 | rcu_read_unlock(); | |
d5cd1f34 | 2383 | |
37357452 DG |
2384 | uevent->enabled = 1; |
2385 | ||
d5cd1f34 DG |
2386 | DBG3("UST ltt event %s added to channel %s", uevent->attr.name, |
2387 | uchan->name); | |
2bdd86d4 MD |
2388 | break; |
2389 | } | |
2390 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2391 | case LTTNG_DOMAIN_UST_PID: | |
2392 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2393 | default: |
54d01ffb DG |
2394 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2395 | goto error; | |
950131af | 2396 | } |
d36b8583 | 2397 | |
54d01ffb | 2398 | ret = LTTCOMM_OK; |
d36b8583 | 2399 | |
54d01ffb DG |
2400 | error: |
2401 | return ret; | |
2402 | } | |
7d29a247 | 2403 | |
54d01ffb DG |
2404 | /* |
2405 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2406 | */ | |
2407 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2408 | char *channel_name, int event_type) |
54d01ffb DG |
2409 | { |
2410 | int ret; | |
2411 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2412 | |
54d01ffb DG |
2413 | switch (domain) { |
2414 | case LTTNG_DOMAIN_KERNEL: | |
2415 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2416 | session->kernel_session); | |
2417 | if (kchan == NULL) { | |
2418 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2419 | ret = channel_kernel_create(session->kernel_session, NULL, |
2420 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2421 | if (ret != LTTCOMM_OK) { |
2422 | goto error; | |
d36b8583 | 2423 | } |
54d01ffb | 2424 | } |
0d0c377a | 2425 | |
54d01ffb DG |
2426 | /* Get the newly created kernel channel pointer */ |
2427 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2428 | session->kernel_session); | |
2429 | if (kchan == NULL) { | |
2430 | /* This sould not happen... */ | |
2431 | ret = LTTCOMM_FATAL; | |
2432 | goto error; | |
2433 | } | |
0fdd1e2c | 2434 | |
7a3d1328 MD |
2435 | switch (event_type) { |
2436 | case LTTNG_KERNEL_SYSCALL: | |
2437 | ret = event_kernel_enable_all_syscalls(session->kernel_session, | |
8c9ae521 | 2438 | kchan, kernel_tracer_fd); |
7a3d1328 MD |
2439 | break; |
2440 | case LTTNG_KERNEL_TRACEPOINT: | |
8c9ae521 | 2441 | /* |
7a3d1328 MD |
2442 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2443 | * events already registered to the channel. | |
8c9ae521 | 2444 | */ |
7a3d1328 MD |
2445 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2446 | kchan, kernel_tracer_fd); | |
2447 | break; | |
2448 | case LTTNG_KERNEL_ALL: | |
2449 | /* Enable syscalls and tracepoints */ | |
8c9ae521 DG |
2450 | ret = event_kernel_enable_all(session->kernel_session, |
2451 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2452 | break; |
2453 | default: | |
2454 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2455 | goto error; | |
8c9ae521 | 2456 | } |
54d01ffb | 2457 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2458 | goto error; |
d36b8583 DG |
2459 | } |
2460 | ||
54d01ffb | 2461 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2462 | break; |
54d01ffb DG |
2463 | default: |
2464 | /* TODO: Userspace tracing */ | |
2465 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2466 | goto error; | |
d36b8583 | 2467 | } |
f3ed775e | 2468 | |
54d01ffb DG |
2469 | ret = LTTCOMM_OK; |
2470 | ||
2471 | error: | |
2472 | return ret; | |
2473 | } | |
2474 | ||
2475 | /* | |
2476 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2477 | */ | |
2478 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2479 | { | |
2480 | int ret; | |
2481 | ssize_t nb_events = 0; | |
2482 | ||
2483 | switch (domain) { | |
2484 | case LTTNG_DOMAIN_KERNEL: | |
2485 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2486 | if (nb_events < 0) { | |
2487 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2488 | goto error; | |
894be886 | 2489 | } |
54d01ffb | 2490 | break; |
b551a063 DG |
2491 | case LTTNG_DOMAIN_UST: |
2492 | nb_events = ust_app_list_events(events); | |
2493 | if (nb_events < 0) { | |
2494 | ret = LTTCOMM_UST_LIST_FAIL; | |
2495 | goto error; | |
2496 | } | |
2497 | break; | |
54d01ffb | 2498 | default: |
54d01ffb DG |
2499 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2500 | goto error; | |
2501 | } | |
894be886 | 2502 | |
54d01ffb | 2503 | return nb_events; |
7d29a247 | 2504 | |
54d01ffb DG |
2505 | error: |
2506 | /* Return negative value to differentiate return code */ | |
2507 | return -ret; | |
2508 | } | |
b389abbe | 2509 | |
54d01ffb DG |
2510 | /* |
2511 | * Command LTTNG_START_TRACE processed by the client thread. | |
2512 | */ | |
2513 | static int cmd_start_trace(struct ltt_session *session) | |
2514 | { | |
2515 | int ret; | |
54d01ffb | 2516 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2517 | struct ltt_ust_session *usess; |
b389abbe | 2518 | |
54d01ffb DG |
2519 | /* Short cut */ |
2520 | ksession = session->kernel_session; | |
b9d9b220 | 2521 | usess = session->ust_session; |
5eb91c98 | 2522 | |
464dd62d MD |
2523 | if (session->enabled) |
2524 | return LTTCOMM_UST_START_FAIL; | |
2525 | session->enabled = 1; | |
2526 | ||
54d01ffb DG |
2527 | /* Kernel tracing */ |
2528 | if (ksession != NULL) { | |
2bdd86d4 MD |
2529 | struct ltt_kernel_channel *kchan; |
2530 | ||
54d01ffb DG |
2531 | /* Open kernel metadata */ |
2532 | if (ksession->metadata == NULL) { | |
2533 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2534 | if (ret < 0) { | |
2535 | ret = LTTCOMM_KERN_META_FAIL; | |
2536 | goto error; | |
b389abbe | 2537 | } |
54d01ffb | 2538 | } |
7d29a247 | 2539 | |
54d01ffb DG |
2540 | /* Open kernel metadata stream */ |
2541 | if (ksession->metadata_stream_fd == 0) { | |
2542 | ret = kernel_open_metadata_stream(ksession); | |
2543 | if (ret < 0) { | |
2544 | ERR("Kernel create metadata stream failed"); | |
2545 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2546 | goto error; | |
2547 | } | |
2548 | } | |
2549 | ||
2550 | /* For each channel */ | |
2551 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2552 | if (kchan->stream_count == 0) { | |
2553 | ret = kernel_open_channel_stream(kchan); | |
2554 | if (ret < 0) { | |
2555 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2556 | goto error; |
2557 | } | |
54d01ffb DG |
2558 | /* Update the stream global counter */ |
2559 | ksession->stream_count_global += ret; | |
7d29a247 | 2560 | } |
54d01ffb DG |
2561 | } |
2562 | ||
2563 | /* Setup kernel consumer socket and send fds to it */ | |
2564 | ret = init_kernel_tracing(ksession); | |
2565 | if (ret < 0) { | |
2566 | ret = LTTCOMM_KERN_START_FAIL; | |
2567 | goto error; | |
2568 | } | |
2569 | ||
2570 | /* This start the kernel tracing */ | |
2571 | ret = kernel_start_session(ksession); | |
2572 | if (ret < 0) { | |
2573 | ret = LTTCOMM_KERN_START_FAIL; | |
2574 | goto error; | |
2575 | } | |
2576 | ||
2577 | /* Quiescent wait after starting trace */ | |
2578 | kernel_wait_quiescent(kernel_tracer_fd); | |
2579 | } | |
2580 | ||
36dc12cc | 2581 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2582 | if (usess) { |
2583 | usess->start_trace = 1; | |
36dc12cc | 2584 | |
b9d9b220 DG |
2585 | ret = ust_app_start_trace_all(usess); |
2586 | if (ret < 0) { | |
2587 | ret = LTTCOMM_UST_START_FAIL; | |
2588 | goto error; | |
2589 | } | |
2bdd86d4 | 2590 | } |
54d01ffb DG |
2591 | |
2592 | ret = LTTCOMM_OK; | |
2593 | ||
2594 | error: | |
2595 | return ret; | |
2596 | } | |
2597 | ||
2598 | /* | |
2599 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2600 | */ | |
2601 | static int cmd_stop_trace(struct ltt_session *session) | |
2602 | { | |
2603 | int ret; | |
2604 | struct ltt_kernel_channel *kchan; | |
2605 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2606 | struct ltt_ust_session *usess; |
54d01ffb DG |
2607 | |
2608 | /* Short cut */ | |
2609 | ksession = session->kernel_session; | |
8be98f9a | 2610 | usess = session->ust_session; |
54d01ffb | 2611 | |
464dd62d MD |
2612 | if (!session->enabled) |
2613 | return LTTCOMM_UST_START_FAIL; | |
2614 | session->enabled = 0; | |
2615 | ||
54d01ffb DG |
2616 | /* Kernel tracer */ |
2617 | if (ksession != NULL) { | |
2618 | DBG("Stop kernel tracing"); | |
2619 | ||
2620 | /* Flush all buffers before stopping */ | |
2621 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2622 | if (ret < 0) { | |
2623 | ERR("Kernel metadata flush failed"); | |
2624 | } | |
f34daff7 | 2625 | |
54d01ffb DG |
2626 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2627 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2628 | if (ret < 0) { |
54d01ffb | 2629 | ERR("Kernel flush buffer error"); |
7d29a247 | 2630 | } |
54d01ffb | 2631 | } |
19e70852 | 2632 | |
54d01ffb DG |
2633 | ret = kernel_stop_session(ksession); |
2634 | if (ret < 0) { | |
2635 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2636 | goto error; |
f3ed775e | 2637 | } |
54d01ffb DG |
2638 | |
2639 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2640 | } |
54d01ffb | 2641 | |
8be98f9a MD |
2642 | /* Flag session that trace should start automatically */ |
2643 | if (usess) { | |
2644 | usess->start_trace = 0; | |
2bdd86d4 | 2645 | |
8be98f9a | 2646 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2647 | if (ret < 0) { |
8be98f9a | 2648 | ret = LTTCOMM_UST_START_FAIL; |
2bdd86d4 MD |
2649 | goto error; |
2650 | } | |
2bdd86d4 | 2651 | } |
54d01ffb DG |
2652 | |
2653 | ret = LTTCOMM_OK; | |
2654 | ||
2655 | error: | |
2656 | return ret; | |
2657 | } | |
2658 | ||
2659 | /* | |
2660 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2661 | */ | |
2662 | static int cmd_create_session(char *name, char *path) | |
2663 | { | |
2664 | int ret; | |
2665 | ||
2666 | ret = session_create(name, path); | |
2667 | if (ret != LTTCOMM_OK) { | |
2668 | goto error; | |
2669 | } | |
2670 | ||
2671 | ret = LTTCOMM_OK; | |
2672 | ||
2673 | error: | |
2674 | return ret; | |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2679 | */ | |
2680 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2681 | { | |
2682 | int ret; | |
2683 | ||
2684 | /* Clean kernel session teardown */ | |
2685 | teardown_kernel_session(session); | |
84cd17c6 MD |
2686 | /* UST session teardown */ |
2687 | teardown_ust_session(session); | |
54d01ffb DG |
2688 | |
2689 | /* | |
2690 | * Must notify the kernel thread here to update it's poll setin order | |
2691 | * to remove the channel(s)' fd just destroyed. | |
2692 | */ | |
2693 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2694 | if (ret < 0) { | |
2695 | perror("write kernel poll pipe"); | |
2696 | } | |
2697 | ||
271933a4 | 2698 | ret = session_destroy(session); |
54d01ffb DG |
2699 | |
2700 | return ret; | |
2701 | } | |
2702 | ||
2703 | /* | |
2704 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2705 | */ | |
2706 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2707 | { | |
2708 | int ret; | |
2709 | ||
2710 | switch (domain) { | |
2711 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2712 | { |
54d01ffb | 2713 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2714 | |
54d01ffb DG |
2715 | kcalibrate.type = calibrate->type; |
2716 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2717 | if (ret < 0) { |
54d01ffb DG |
2718 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2719 | goto error; | |
33a2b854 | 2720 | } |
54d01ffb DG |
2721 | break; |
2722 | } | |
2723 | default: | |
2724 | /* TODO: Userspace tracing */ | |
2725 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2726 | goto error; | |
2727 | } | |
33a2b854 | 2728 | |
54d01ffb | 2729 | ret = LTTCOMM_OK; |
33a2b854 | 2730 | |
54d01ffb DG |
2731 | error: |
2732 | return ret; | |
2733 | } | |
7d29a247 | 2734 | |
54d01ffb DG |
2735 | /* |
2736 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2737 | */ | |
2738 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2739 | char *sock_path) | |
2740 | { | |
2741 | int ret, sock; | |
b389abbe | 2742 | |
54d01ffb DG |
2743 | switch (domain) { |
2744 | case LTTNG_DOMAIN_KERNEL: | |
2745 | /* Can't register a consumer if there is already one */ | |
2746 | if (session->kernel_session->consumer_fd != 0) { | |
2747 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2748 | goto error; | |
2749 | } | |
2750 | ||
2751 | sock = lttcomm_connect_unix_sock(sock_path); | |
2752 | if (sock < 0) { | |
2753 | ret = LTTCOMM_CONNECT_FAIL; | |
2754 | goto error; | |
2755 | } | |
2756 | ||
2757 | session->kernel_session->consumer_fd = sock; | |
2758 | break; | |
2759 | default: | |
2760 | /* TODO: Userspace tracing */ | |
2761 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2762 | goto error; | |
2763 | } | |
2764 | ||
2765 | ret = LTTCOMM_OK; | |
2766 | ||
2767 | error: | |
2768 | return ret; | |
2769 | } | |
2770 | ||
2771 | /* | |
2772 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2773 | */ | |
2774 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2775 | struct lttng_domain **domains) | |
2776 | { | |
b551a063 | 2777 | int ret, index = 0; |
54d01ffb DG |
2778 | ssize_t nb_dom = 0; |
2779 | ||
2780 | if (session->kernel_session != NULL) { | |
b551a063 | 2781 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
2782 | nb_dom++; |
2783 | } | |
2784 | ||
b551a063 DG |
2785 | if (session->ust_session != NULL) { |
2786 | DBG3("Listing domains found UST global domain"); | |
2787 | nb_dom++; | |
2788 | } | |
54d01ffb | 2789 | |
b551a063 | 2790 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
2791 | if (*domains == NULL) { |
2792 | ret = -LTTCOMM_FATAL; | |
2793 | goto error; | |
2794 | } | |
2795 | ||
b551a063 DG |
2796 | if (session->kernel_session != NULL) { |
2797 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
2798 | index++; | |
2799 | } | |
2800 | ||
2801 | if (session->ust_session != NULL) { | |
2802 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
2803 | index++; | |
2804 | } | |
54d01ffb | 2805 | |
54d01ffb DG |
2806 | return nb_dom; |
2807 | ||
2808 | error: | |
2809 | return ret; | |
2810 | } | |
2811 | ||
2812 | /* | |
2813 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2814 | */ | |
b551a063 | 2815 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
2816 | struct lttng_channel **channels) |
2817 | { | |
2818 | int ret; | |
2819 | ssize_t nb_chan = 0; | |
2820 | ||
b551a063 DG |
2821 | switch (domain) { |
2822 | case LTTNG_DOMAIN_KERNEL: | |
2823 | if (session->kernel_session != NULL) { | |
2824 | nb_chan = session->kernel_session->channel_count; | |
2825 | } | |
0df502fd | 2826 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
2827 | break; |
2828 | case LTTNG_DOMAIN_UST: | |
2829 | if (session->ust_session != NULL) { | |
2830 | nb_chan = hashtable_get_count( | |
2831 | session->ust_session->domain_global.channels); | |
2832 | } | |
0df502fd | 2833 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
2834 | break; |
2835 | default: | |
2836 | *channels = NULL; | |
2837 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2838 | goto error; |
2839 | } | |
2840 | ||
b551a063 DG |
2841 | if (nb_chan > 0) { |
2842 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
2843 | if (*channels == NULL) { | |
2844 | ret = -LTTCOMM_FATAL; | |
2845 | goto error; | |
2846 | } | |
54d01ffb | 2847 | |
b551a063 DG |
2848 | list_lttng_channels(domain, session, *channels); |
2849 | } else { | |
2850 | *channels = NULL; | |
2851 | } | |
2bdd86d4 | 2852 | |
54d01ffb DG |
2853 | return nb_chan; |
2854 | ||
2855 | error: | |
2856 | return ret; | |
2857 | } | |
2858 | ||
2859 | /* | |
2860 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2861 | */ | |
b551a063 | 2862 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
2863 | char *channel_name, struct lttng_event **events) |
2864 | { | |
b551a063 | 2865 | int ret = 0; |
54d01ffb | 2866 | ssize_t nb_event = 0; |
54d01ffb | 2867 | |
b551a063 DG |
2868 | switch (domain) { |
2869 | case LTTNG_DOMAIN_KERNEL: | |
2870 | if (session->kernel_session != NULL) { | |
2871 | nb_event = list_lttng_kernel_events(channel_name, | |
2872 | session->kernel_session, events); | |
54d01ffb | 2873 | } |
b551a063 DG |
2874 | break; |
2875 | case LTTNG_DOMAIN_UST: | |
2876 | { | |
2877 | if (session->ust_session != NULL) { | |
2878 | nb_event = list_lttng_ust_global_events(channel_name, | |
2879 | &session->ust_session->domain_global, events); | |
2880 | } | |
2881 | break; | |
54d01ffb | 2882 | } |
b551a063 DG |
2883 | default: |
2884 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
2885 | goto error; |
2886 | } | |
2887 | ||
b551a063 | 2888 | ret = nb_event; |
54d01ffb DG |
2889 | |
2890 | error: | |
2891 | return ret; | |
2892 | } | |
2893 | ||
2894 | /* | |
2895 | * Process the command requested by the lttng client within the command | |
2896 | * context structure. This function make sure that the return structure (llm) | |
2897 | * is set and ready for transmission before returning. | |
2898 | * | |
2899 | * Return any error encountered or 0 for success. | |
2900 | */ | |
2901 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2902 | { | |
2903 | int ret = LTTCOMM_OK; | |
44d3bd01 | 2904 | int need_tracing_session = 1; |
54d01ffb DG |
2905 | |
2906 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2907 | ||
2908 | /* | |
2909 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2910 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2911 | * command. |
2912 | */ | |
2913 | switch(cmd_ctx->lsm->cmd_type) { | |
2914 | case LTTNG_LIST_SESSIONS: | |
2915 | case LTTNG_LIST_TRACEPOINTS: | |
2916 | case LTTNG_LIST_DOMAINS: | |
2917 | case LTTNG_LIST_CHANNELS: | |
2918 | case LTTNG_LIST_EVENTS: | |
2919 | break; | |
2920 | default: | |
2921 | /* Setup lttng message with no payload */ | |
2922 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2923 | if (ret < 0) { | |
2924 | /* This label does not try to unlock the session */ | |
2925 | goto init_setup_error; | |
2926 | } | |
2927 | } | |
2928 | ||
2929 | /* Commands that DO NOT need a session. */ | |
2930 | switch (cmd_ctx->lsm->cmd_type) { | |
2931 | case LTTNG_CALIBRATE: | |
2932 | case LTTNG_CREATE_SESSION: | |
2933 | case LTTNG_LIST_SESSIONS: | |
2934 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 2935 | need_tracing_session = 0; |
54d01ffb DG |
2936 | break; |
2937 | default: | |
2938 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 2939 | session_lock_list(); |
54d01ffb | 2940 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 2941 | session_unlock_list(); |
54d01ffb DG |
2942 | if (cmd_ctx->session == NULL) { |
2943 | if (cmd_ctx->lsm->session.name != NULL) { | |
2944 | ret = LTTCOMM_SESS_NOT_FOUND; | |
2945 | } else { | |
2946 | /* If no session name specified */ | |
2947 | ret = LTTCOMM_SELECT_SESS; | |
2948 | } | |
2949 | goto error; | |
2950 | } else { | |
2951 | /* Acquire lock for the session */ | |
2952 | session_lock(cmd_ctx->session); | |
2953 | } | |
2954 | break; | |
2955 | } | |
b389abbe | 2956 | |
54d01ffb DG |
2957 | /* |
2958 | * Check domain type for specific "pre-action". | |
2959 | */ | |
2960 | switch (cmd_ctx->lsm->domain.type) { | |
2961 | case LTTNG_DOMAIN_KERNEL: | |
2962 | /* Kernel tracer check */ | |
2963 | if (kernel_tracer_fd == 0) { | |
2964 | /* Basically, load kernel tracer modules */ | |
2965 | init_kernel_tracer(); | |
2966 | if (kernel_tracer_fd == 0) { | |
2967 | ret = LTTCOMM_KERN_NA; | |
2968 | goto error; | |
2969 | } | |
2970 | } | |
5eb91c98 | 2971 | |
54d01ffb | 2972 | /* Need a session for kernel command */ |
44d3bd01 | 2973 | if (need_tracing_session) { |
54d01ffb DG |
2974 | if (cmd_ctx->session->kernel_session == NULL) { |
2975 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 2976 | if (ret < 0) { |
54d01ffb | 2977 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
2978 | goto error; |
2979 | } | |
b389abbe | 2980 | } |
7d29a247 | 2981 | |
54d01ffb | 2982 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2983 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2984 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 2985 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2986 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2987 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2988 | if (ret < 0) { |
54d01ffb DG |
2989 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
2990 | goto error; | |
950131af | 2991 | } |
33a2b854 | 2992 | } |
3bd1e081 | 2993 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
0d0c377a | 2994 | } |
54d01ffb | 2995 | break; |
2bdd86d4 | 2996 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2997 | { |
44d3bd01 | 2998 | if (need_tracing_session) { |
f6a9efaa | 2999 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 DG |
3000 | ret = create_ust_session(cmd_ctx->session, |
3001 | &cmd_ctx->lsm->domain); | |
3002 | if (ret != LTTCOMM_OK) { | |
3003 | goto error; | |
3004 | } | |
3005 | } | |
2bdd86d4 MD |
3006 | /* Start the kernel consumer daemon */ |
3007 | pthread_mutex_lock(&ustconsumer_data.pid_mutex); | |
3008 | if (ustconsumer_data.pid == 0 && | |
3009 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3010 | pthread_mutex_unlock(&ustconsumer_data.pid_mutex); | |
3011 | ret = start_consumerd(&ustconsumer_data); | |
3012 | if (ret < 0) { | |
3013 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
3014 | goto error; | |
3015 | } | |
48842b30 | 3016 | |
ba5d816e | 3017 | ust_consumer_fd = ustconsumer_data.cmd_sock; |
2bdd86d4 MD |
3018 | } |
3019 | pthread_mutex_unlock(&ustconsumer_data.pid_mutex); | |
44d3bd01 DG |
3020 | } |
3021 | break; | |
48842b30 | 3022 | } |
54d01ffb | 3023 | default: |
54d01ffb DG |
3024 | break; |
3025 | } | |
33a2b854 | 3026 | |
54d01ffb DG |
3027 | /* Process by command type */ |
3028 | switch (cmd_ctx->lsm->cmd_type) { | |
3029 | case LTTNG_ADD_CONTEXT: | |
3030 | { | |
3031 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3032 | cmd_ctx->lsm->u.context.channel_name, | |
3033 | cmd_ctx->lsm->u.context.event_name, | |
3034 | &cmd_ctx->lsm->u.context.ctx); | |
3035 | break; | |
3036 | } | |
3037 | case LTTNG_DISABLE_CHANNEL: | |
3038 | { | |
3039 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3040 | cmd_ctx->lsm->u.disable.channel_name); | |
3041 | break; | |
3042 | } | |
3043 | case LTTNG_DISABLE_EVENT: | |
3044 | { | |
3045 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3046 | cmd_ctx->lsm->u.disable.channel_name, | |
3047 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3048 | ret = LTTCOMM_OK; |
3049 | break; | |
3050 | } | |
54d01ffb DG |
3051 | case LTTNG_DISABLE_ALL_EVENT: |
3052 | { | |
2bdd86d4 | 3053 | DBG("Disabling all events"); |
54d01ffb DG |
3054 | |
3055 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3056 | cmd_ctx->lsm->u.disable.channel_name); | |
3057 | break; | |
3058 | } | |
3059 | case LTTNG_ENABLE_CHANNEL: | |
3060 | { | |
44d3bd01 | 3061 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb DG |
3062 | &cmd_ctx->lsm->u.channel.chan); |
3063 | break; | |
3064 | } | |
3065 | case LTTNG_ENABLE_EVENT: | |
3066 | { | |
3067 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3068 | cmd_ctx->lsm->u.enable.channel_name, | |
3069 | &cmd_ctx->lsm->u.enable.event); | |
3070 | break; | |
3071 | } | |
3072 | case LTTNG_ENABLE_ALL_EVENT: | |
3073 | { | |
2bdd86d4 | 3074 | DBG("Enabling all events"); |
54d01ffb DG |
3075 | |
3076 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3077 | cmd_ctx->lsm->u.enable.channel_name, |
3078 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3079 | break; |
3080 | } | |
052da939 | 3081 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3082 | { |
9f19cc17 | 3083 | struct lttng_event *events; |
54d01ffb | 3084 | ssize_t nb_events; |
052da939 | 3085 | |
54d01ffb DG |
3086 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3087 | if (nb_events < 0) { | |
3088 | ret = -nb_events; | |
3089 | goto error; | |
2ef84c95 DG |
3090 | } |
3091 | ||
3092 | /* | |
3093 | * Setup lttng message with payload size set to the event list size in | |
3094 | * bytes and then copy list into the llm payload. | |
3095 | */ | |
052da939 | 3096 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3097 | if (ret < 0) { |
052da939 | 3098 | free(events); |
2ef84c95 DG |
3099 | goto setup_error; |
3100 | } | |
3101 | ||
3102 | /* Copy event list into message payload */ | |
9f19cc17 | 3103 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3104 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3105 | |
9f19cc17 | 3106 | free(events); |
2ef84c95 DG |
3107 | |
3108 | ret = LTTCOMM_OK; | |
3109 | break; | |
3110 | } | |
f3ed775e | 3111 | case LTTNG_START_TRACE: |
8c0faa1d | 3112 | { |
54d01ffb | 3113 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3114 | break; |
3115 | } | |
f3ed775e | 3116 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3117 | { |
54d01ffb | 3118 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3119 | break; |
3120 | } | |
5e16da05 MD |
3121 | case LTTNG_CREATE_SESSION: |
3122 | { | |
54d01ffb DG |
3123 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3124 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
3125 | break; |
3126 | } | |
3127 | case LTTNG_DESTROY_SESSION: | |
3128 | { | |
54d01ffb DG |
3129 | ret = cmd_destroy_session(cmd_ctx->session, |
3130 | cmd_ctx->lsm->session.name); | |
5461b305 | 3131 | break; |
5e16da05 | 3132 | } |
9f19cc17 | 3133 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3134 | { |
54d01ffb DG |
3135 | ssize_t nb_dom; |
3136 | struct lttng_domain *domains; | |
5461b305 | 3137 | |
54d01ffb DG |
3138 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3139 | if (nb_dom < 0) { | |
3140 | ret = -nb_dom; | |
3141 | goto error; | |
ce3d728c | 3142 | } |
520ff687 | 3143 | |
54d01ffb | 3144 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3145 | if (ret < 0) { |
3146 | goto setup_error; | |
520ff687 | 3147 | } |
57167058 | 3148 | |
54d01ffb DG |
3149 | /* Copy event list into message payload */ |
3150 | memcpy(cmd_ctx->llm->payload, domains, | |
3151 | nb_dom * sizeof(struct lttng_domain)); | |
3152 | ||
3153 | free(domains); | |
5e16da05 | 3154 | |
5461b305 | 3155 | ret = LTTCOMM_OK; |
5e16da05 MD |
3156 | break; |
3157 | } | |
9f19cc17 | 3158 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3159 | { |
54d01ffb DG |
3160 | size_t nb_chan; |
3161 | struct lttng_channel *channels; | |
3162 | ||
b551a063 DG |
3163 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3164 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3165 | if (nb_chan < 0) { |
3166 | ret = -nb_chan; | |
3167 | goto error; | |
5461b305 | 3168 | } |
ca95a216 | 3169 | |
54d01ffb | 3170 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3171 | if (ret < 0) { |
3172 | goto setup_error; | |
3173 | } | |
9f19cc17 | 3174 | |
54d01ffb DG |
3175 | /* Copy event list into message payload */ |
3176 | memcpy(cmd_ctx->llm->payload, channels, | |
3177 | nb_chan * sizeof(struct lttng_channel)); | |
3178 | ||
3179 | free(channels); | |
9f19cc17 DG |
3180 | |
3181 | ret = LTTCOMM_OK; | |
5461b305 | 3182 | break; |
5e16da05 | 3183 | } |
9f19cc17 | 3184 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3185 | { |
b551a063 | 3186 | ssize_t nb_event; |
684d34d2 | 3187 | struct lttng_event *events = NULL; |
9f19cc17 | 3188 | |
b551a063 | 3189 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3190 | cmd_ctx->lsm->u.list.channel_name, &events); |
3191 | if (nb_event < 0) { | |
3192 | ret = -nb_event; | |
3193 | goto error; | |
5461b305 | 3194 | } |
ca95a216 | 3195 | |
54d01ffb | 3196 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3197 | if (ret < 0) { |
3198 | goto setup_error; | |
3199 | } | |
9f19cc17 | 3200 | |
54d01ffb DG |
3201 | /* Copy event list into message payload */ |
3202 | memcpy(cmd_ctx->llm->payload, events, | |
3203 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3204 | |
54d01ffb | 3205 | free(events); |
9f19cc17 DG |
3206 | |
3207 | ret = LTTCOMM_OK; | |
5461b305 | 3208 | break; |
5e16da05 MD |
3209 | } |
3210 | case LTTNG_LIST_SESSIONS: | |
3211 | { | |
54d01ffb | 3212 | session_lock_list(); |
5461b305 | 3213 | |
6c9cc2ab | 3214 | if (session_list_ptr->count == 0) { |
f3ed775e | 3215 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3216 | session_unlock_list(); |
5461b305 | 3217 | goto error; |
57167058 | 3218 | } |
5e16da05 | 3219 | |
6c9cc2ab DG |
3220 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3221 | session_list_ptr->count); | |
5461b305 | 3222 | if (ret < 0) { |
54d01ffb | 3223 | session_unlock_list(); |
5461b305 | 3224 | goto setup_error; |
e065084a | 3225 | } |
5e16da05 | 3226 | |
6c9cc2ab DG |
3227 | /* Filled the session array */ |
3228 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3229 | ||
54d01ffb | 3230 | session_unlock_list(); |
5e16da05 | 3231 | |
5461b305 | 3232 | ret = LTTCOMM_OK; |
5e16da05 MD |
3233 | break; |
3234 | } | |
d0254c7c MD |
3235 | case LTTNG_CALIBRATE: |
3236 | { | |
54d01ffb DG |
3237 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3238 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3239 | break; |
3240 | } | |
d9800920 DG |
3241 | case LTTNG_REGISTER_CONSUMER: |
3242 | { | |
54d01ffb DG |
3243 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3244 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3245 | break; |
3246 | } | |
5e16da05 | 3247 | default: |
5e16da05 | 3248 | ret = LTTCOMM_UND; |
5461b305 | 3249 | break; |
fac6795d DG |
3250 | } |
3251 | ||
5461b305 | 3252 | error: |
5461b305 DG |
3253 | if (cmd_ctx->llm == NULL) { |
3254 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3255 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3256 | goto setup_error; |
3257 | } | |
3258 | } | |
54d01ffb | 3259 | /* Set return code */ |
5461b305 | 3260 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3261 | setup_error: |
b5541356 | 3262 | if (cmd_ctx->session) { |
54d01ffb | 3263 | session_unlock(cmd_ctx->session); |
b5541356 | 3264 | } |
54d01ffb | 3265 | init_setup_error: |
8028d920 | 3266 | return ret; |
fac6795d DG |
3267 | } |
3268 | ||
1d4b027a | 3269 | /* |
d063d709 DG |
3270 | * This thread manage all clients request using the unix client socket for |
3271 | * communication. | |
1d4b027a DG |
3272 | */ |
3273 | static void *thread_manage_clients(void *data) | |
3274 | { | |
5eb91c98 DG |
3275 | int sock = 0, ret, i, pollfd; |
3276 | uint32_t revents, nb_fd; | |
273ea72c | 3277 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3278 | struct lttng_poll_event events; |
1d4b027a DG |
3279 | |
3280 | DBG("[thread] Manage client started"); | |
3281 | ||
f6a9efaa DG |
3282 | rcu_register_thread(); |
3283 | ||
1d4b027a DG |
3284 | ret = lttcomm_listen_unix_sock(client_sock); |
3285 | if (ret < 0) { | |
3286 | goto error; | |
3287 | } | |
3288 | ||
5eb91c98 DG |
3289 | /* |
3290 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3291 | * more will be added to this poll set. | |
3292 | */ | |
3293 | ret = create_thread_poll_set(&events, 2); | |
3294 | if (ret < 0) { | |
3295 | goto error; | |
3296 | } | |
273ea72c | 3297 | |
5eb91c98 DG |
3298 | /* Add the application registration socket */ |
3299 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3300 | if (ret < 0) { | |
3301 | goto error; | |
3302 | } | |
273ea72c | 3303 | |
bbd973c2 DG |
3304 | /* |
3305 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3306 | */ |
3307 | if (opt_sig_parent) { | |
3308 | kill(ppid, SIGCHLD); | |
3309 | } | |
3310 | ||
3311 | while (1) { | |
1d4b027a | 3312 | DBG("Accepting client command ..."); |
273ea72c | 3313 | |
5eb91c98 DG |
3314 | nb_fd = LTTNG_POLL_GETNB(&events); |
3315 | ||
273ea72c | 3316 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3317 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3318 | if (ret < 0) { |
273ea72c DG |
3319 | goto error; |
3320 | } | |
3321 | ||
5eb91c98 DG |
3322 | for (i = 0; i < nb_fd; i++) { |
3323 | /* Fetch once the poll data */ | |
3324 | revents = LTTNG_POLL_GETEV(&events, i); | |
3325 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3326 | ||
3327 | /* Thread quit pipe has been closed. Killing thread. */ | |
3328 | ret = check_thread_quit_pipe(pollfd, revents); | |
3329 | if (ret) { | |
3330 | goto error; | |
3331 | } | |
3332 | ||
3333 | /* Event on the registration socket */ | |
3334 | if (pollfd == client_sock) { | |
3335 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3336 | ERR("Client socket poll error"); | |
3337 | goto error; | |
3338 | } | |
3339 | } | |
3340 | } | |
3341 | ||
3342 | DBG("Wait for client response"); | |
3343 | ||
3344 | sock = lttcomm_accept_unix_sock(client_sock); | |
3345 | if (sock < 0) { | |
273ea72c | 3346 | goto error; |
273ea72c DG |
3347 | } |
3348 | ||
5eb91c98 | 3349 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3350 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3351 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3352 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3353 | goto error; |
5eb91c98 | 3354 | } |
1d4b027a | 3355 | |
5eb91c98 | 3356 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3357 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3358 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3359 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3360 | goto error; |
3361 | } | |
1d4b027a | 3362 | |
5eb91c98 DG |
3363 | cmd_ctx->llm = NULL; |
3364 | cmd_ctx->session = NULL; | |
1d4b027a | 3365 | |
5eb91c98 DG |
3366 | /* |
3367 | * Data is received from the lttng client. The struct | |
3368 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3369 | * the client. | |
3370 | */ | |
3371 | DBG("Receiving data from client ..."); | |
3372 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
3373 | sizeof(struct lttcomm_session_msg)); | |
3374 | if (ret <= 0) { | |
3375 | DBG("Nothing recv() from client... continuing"); | |
3376 | close(sock); | |
3377 | free(cmd_ctx); | |
3378 | continue; | |
3379 | } | |
1d4b027a | 3380 | |
5eb91c98 DG |
3381 | // TODO: Validate cmd_ctx including sanity check for |
3382 | // security purpose. | |
f7776ea7 | 3383 | |
f6a9efaa | 3384 | rcu_thread_online(); |
5eb91c98 DG |
3385 | /* |
3386 | * This function dispatch the work to the kernel or userspace tracer | |
3387 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3388 | * informations for the client. The command context struct contains | |
3389 | * everything this function may needs. | |
3390 | */ | |
3391 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3392 | rcu_thread_offline(); |
5eb91c98 | 3393 | if (ret < 0) { |
bbd973c2 | 3394 | /* |
5eb91c98 | 3395 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3396 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3397 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3398 | */ |
bbd973c2 | 3399 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3400 | continue; |
3401 | } | |
d6e4fca4 | 3402 | |
54d01ffb DG |
3403 | DBG("Sending response (size: %d, retcode: %s)", |
3404 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3405 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3406 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3407 | if (ret < 0) { |
3408 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3409 | } |
1d4b027a | 3410 | |
5eb91c98 DG |
3411 | clean_command_ctx(&cmd_ctx); |
3412 | ||
3413 | /* End of transmission */ | |
273ea72c DG |
3414 | close(sock); |
3415 | } | |
3416 | ||
5eb91c98 DG |
3417 | error: |
3418 | DBG("Client thread dying"); | |
273ea72c | 3419 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3420 | close(client_sock); |
3421 | close(sock); | |
273ea72c | 3422 | |
5eb91c98 | 3423 | lttng_poll_clean(&events); |
a2fb29a5 | 3424 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3425 | |
3426 | rcu_unregister_thread(); | |
1d4b027a DG |
3427 | return NULL; |
3428 | } | |
3429 | ||
3430 | ||
fac6795d DG |
3431 | /* |
3432 | * usage function on stderr | |
3433 | */ | |
3434 | static void usage(void) | |
3435 | { | |
b716ce68 | 3436 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3437 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3438 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3439 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3440 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3441 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
3bd1e081 MD |
3442 | fprintf(stderr, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n"); |
3443 | fprintf(stderr, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n"); | |
d6f42150 DG |
3444 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3445 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3446 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3447 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3448 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3449 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3450 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
fac6795d DG |
3451 | } |
3452 | ||
3453 | /* | |
3454 | * daemon argument parsing | |
3455 | */ | |
3456 | static int parse_args(int argc, char **argv) | |
3457 | { | |
3458 | int c; | |
3459 | ||
3460 | static struct option long_options[] = { | |
3461 | { "client-sock", 1, 0, 'c' }, | |
3462 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3463 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3464 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
3465 | { "ustconsumerd-cmd-sock", 1, 0, 'D' }, | |
3466 | { "ustconsumerd-err-sock", 1, 0, 'F' }, | |
fac6795d | 3467 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3468 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3469 | { "help", 0, 0, 'h' }, |
3470 | { "group", 1, 0, 'g' }, | |
3471 | { "version", 0, 0, 'V' }, | |
75462a81 | 3472 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3473 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3474 | { "verbose-consumer", 0, 0, 'Z' }, |
fac6795d DG |
3475 | { NULL, 0, 0, 0 } |
3476 | }; | |
3477 | ||
3478 | while (1) { | |
3479 | int option_index = 0; | |
3bd1e081 | 3480 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z", |
54d01ffb | 3481 | long_options, &option_index); |
fac6795d DG |
3482 | if (c == -1) { |
3483 | break; | |
3484 | } | |
3485 | ||
3486 | switch (c) { | |
3487 | case 0: | |
3488 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3489 | if (optarg) { | |
3490 | fprintf(stderr, " with arg %s\n", optarg); | |
3491 | } | |
3492 | break; | |
b716ce68 | 3493 | case 'c': |
fac6795d DG |
3494 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3495 | break; | |
3496 | case 'a': | |
3497 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3498 | break; | |
3499 | case 'd': | |
3500 | opt_daemon = 1; | |
3501 | break; | |
3502 | case 'g': | |
3503 | opt_tracing_group = strdup(optarg); | |
3504 | break; | |
3505 | case 'h': | |
3506 | usage(); | |
3507 | exit(EXIT_FAILURE); | |
3508 | case 'V': | |
3509 | fprintf(stdout, "%s\n", VERSION); | |
3510 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3511 | case 'S': |
3512 | opt_sig_parent = 1; | |
3513 | break; | |
d6f42150 | 3514 | case 'E': |
3bd1e081 | 3515 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3516 | break; |
3517 | case 'C': | |
3bd1e081 MD |
3518 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3519 | break; | |
3520 | case 'F': | |
3521 | snprintf(ustconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3522 | break; | |
3523 | case 'D': | |
3524 | snprintf(ustconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3525 | break; |
75462a81 DG |
3526 | case 'q': |
3527 | opt_quiet = 1; | |
3528 | break; | |
3f9947db | 3529 | case 'v': |
53086306 DG |
3530 | /* Verbose level can increase using multiple -v */ |
3531 | opt_verbose += 1; | |
3f9947db | 3532 | break; |
31f73cc9 | 3533 | case 'Z': |
3bd1e081 | 3534 | opt_verbose_consumer += 1; |
31f73cc9 | 3535 | break; |
fac6795d DG |
3536 | default: |
3537 | /* Unknown option or other error. | |
3538 | * Error is printed by getopt, just return */ | |
3539 | return -1; | |
3540 | } | |
3541 | } | |
3542 | ||
3543 | return 0; | |
3544 | } | |
3545 | ||
3546 | /* | |
d063d709 | 3547 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3548 | * apps_sock - The communication socket for all UST apps. |
3549 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3550 | */ |
cf3af59e | 3551 | static int init_daemon_socket(void) |
fac6795d DG |
3552 | { |
3553 | int ret = 0; | |
3554 | mode_t old_umask; | |
3555 | ||
3556 | old_umask = umask(0); | |
3557 | ||
3558 | /* Create client tool unix socket */ | |
d6f42150 DG |
3559 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3560 | if (client_sock < 0) { | |
3561 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3562 | ret = -1; |
3563 | goto end; | |
3564 | } | |
3565 | ||
3566 | /* File permission MUST be 660 */ | |
3567 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3568 | if (ret < 0) { | |
d6f42150 | 3569 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3570 | perror("chmod"); |
3571 | goto end; | |
3572 | } | |
3573 | ||
3574 | /* Create the application unix socket */ | |
d6f42150 DG |
3575 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3576 | if (apps_sock < 0) { | |
3577 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3578 | ret = -1; |
3579 | goto end; | |
3580 | } | |
3581 | ||
d6f42150 | 3582 | /* File permission MUST be 666 */ |
54d01ffb DG |
3583 | ret = chmod(apps_unix_sock_path, |
3584 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3585 | if (ret < 0) { |
d6f42150 | 3586 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3587 | perror("chmod"); |
3588 | goto end; | |
3589 | } | |
3590 | ||
3591 | end: | |
3592 | umask(old_umask); | |
3593 | return ret; | |
3594 | } | |
3595 | ||
3596 | /* | |
54d01ffb DG |
3597 | * Check if the global socket is available, and if a daemon is answering at the |
3598 | * other side. If yes, error is returned. | |
fac6795d | 3599 | */ |
cf3af59e | 3600 | static int check_existing_daemon(void) |
fac6795d | 3601 | { |
7d8234d9 | 3602 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3603 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3604 | return 0; |
099e26bd | 3605 | } |
54d01ffb | 3606 | |
7d8234d9 | 3607 | /* Is there anybody out there ? */ |
099e26bd | 3608 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3609 | return -EEXIST; |
099e26bd | 3610 | } else { |
7d8234d9 | 3611 | return 0; |
099e26bd | 3612 | } |
fac6795d DG |
3613 | } |
3614 | ||
fac6795d | 3615 | /* |
d063d709 | 3616 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3617 | * |
d063d709 DG |
3618 | * Race window between mkdir and chown is OK because we are going from more |
3619 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3620 | */ |
d6f42150 | 3621 | static int set_permissions(void) |
fac6795d DG |
3622 | { |
3623 | int ret; | |
996b65c8 | 3624 | gid_t gid; |
fac6795d | 3625 | |
996b65c8 MD |
3626 | gid = allowed_group(); |
3627 | if (gid < 0) { | |
a463f419 DG |
3628 | if (is_root) { |
3629 | WARN("No tracing group detected"); | |
3630 | ret = 0; | |
3631 | } else { | |
3632 | ERR("Missing tracing group. Aborting execution."); | |
3633 | ret = -1; | |
3634 | } | |
fac6795d DG |
3635 | goto end; |
3636 | } | |
3637 | ||
d6f42150 | 3638 | /* Set lttng run dir */ |
996b65c8 | 3639 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3640 | if (ret < 0) { |
3641 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3642 | perror("chown"); | |
3643 | } | |
3644 | ||
3645 | /* lttng client socket path */ | |
996b65c8 | 3646 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3647 | if (ret < 0) { |
d6f42150 DG |
3648 | ERR("Unable to set group on %s", client_unix_sock_path); |
3649 | perror("chown"); | |
3650 | } | |
3651 | ||
3bd1e081 MD |
3652 | /* kconsumer error socket path */ |
3653 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3654 | if (ret < 0) { |
3bd1e081 MD |
3655 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
3656 | perror("chown"); | |
3657 | } | |
3658 | ||
3659 | /* ustconsumer error socket path */ | |
3660 | ret = chown(ustconsumer_data.err_unix_sock_path, 0, gid); | |
3661 | if (ret < 0) { | |
3662 | ERR("Unable to set group on %s", ustconsumer_data.err_unix_sock_path); | |
fac6795d DG |
3663 | perror("chown"); |
3664 | } | |
3665 | ||
d6f42150 | 3666 | DBG("All permissions are set"); |
e07ae692 | 3667 | |
fac6795d DG |
3668 | end: |
3669 | return ret; | |
3670 | } | |
3671 | ||
7a485870 | 3672 | /* |
d063d709 | 3673 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3674 | */ |
3675 | static int create_kernel_poll_pipe(void) | |
3676 | { | |
3677 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3678 | } | |
3679 | ||
099e26bd DG |
3680 | /* |
3681 | * Create the application command pipe to wake thread_manage_apps. | |
3682 | */ | |
3683 | static int create_apps_cmd_pipe(void) | |
3684 | { | |
3685 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3686 | } | |
3687 | ||
d6f42150 | 3688 | /* |
d063d709 | 3689 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3690 | */ |
3691 | static int create_lttng_rundir(void) | |
3692 | { | |
3693 | int ret; | |
3694 | ||
3695 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3696 | if (ret < 0) { | |
b1f11e69 DG |
3697 | if (errno != EEXIST) { |
3698 | ERR("Unable to create " LTTNG_RUNDIR); | |
3699 | goto error; | |
3700 | } else { | |
3701 | ret = 0; | |
3702 | } | |
d6f42150 DG |
3703 | } |
3704 | ||
3705 | error: | |
3706 | return ret; | |
3707 | } | |
3708 | ||
3709 | /* | |
d063d709 DG |
3710 | * Setup sockets and directory needed by the kconsumerd communication with the |
3711 | * session daemon. | |
d6f42150 | 3712 | */ |
3bd1e081 | 3713 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
3714 | { |
3715 | int ret; | |
3bd1e081 MD |
3716 | const char *path = consumer_data->type == LTTNG_CONSUMER_KERNEL ? |
3717 | KCONSUMERD_PATH : USTCONSUMERD_PATH; | |
d6f42150 | 3718 | |
3bd1e081 MD |
3719 | if (strlen(consumer_data->err_unix_sock_path) == 0) { |
3720 | snprintf(consumer_data->err_unix_sock_path, PATH_MAX, | |
3721 | consumer_data->type == LTTNG_CONSUMER_KERNEL ? | |
3722 | KCONSUMERD_ERR_SOCK_PATH : | |
3723 | USTCONSUMERD_ERR_SOCK_PATH); | |
d6f42150 DG |
3724 | } |
3725 | ||
3bd1e081 MD |
3726 | if (strlen(consumer_data->cmd_unix_sock_path) == 0) { |
3727 | snprintf(consumer_data->cmd_unix_sock_path, PATH_MAX, | |
3728 | consumer_data->type == LTTNG_CONSUMER_KERNEL ? | |
3729 | KCONSUMERD_CMD_SOCK_PATH : | |
3730 | USTCONSUMERD_CMD_SOCK_PATH); | |
d6f42150 DG |
3731 | } |
3732 | ||
3bd1e081 | 3733 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 3734 | if (ret < 0) { |
6beb2242 | 3735 | if (errno != EEXIST) { |
3bd1e081 | 3736 | ERR("Failed to create %s", path); |
6beb2242 DG |
3737 | goto error; |
3738 | } | |
3739 | ret = 0; | |
d6f42150 DG |
3740 | } |
3741 | ||
3742 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3743 | consumer_data->err_sock = |
3744 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3745 | if (consumer_data->err_sock < 0) { | |
3746 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3747 | ret = -1; |
3748 | goto error; | |
3749 | } | |
3750 | ||
3751 | /* File permission MUST be 660 */ | |
3bd1e081 | 3752 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3753 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3754 | if (ret < 0) { |
3bd1e081 | 3755 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
d6f42150 DG |
3756 | perror("chmod"); |
3757 | goto error; | |
3758 | } | |
3759 | ||
3760 | error: | |
3761 | return ret; | |
3762 | } | |
3763 | ||
fac6795d | 3764 | /* |
d063d709 | 3765 | * Signal handler for the daemon |
cf3af59e | 3766 | * |
54d01ffb DG |
3767 | * Simply stop all worker threads, leaving main() return gracefully after |
3768 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3769 | */ |
3770 | static void sighandler(int sig) | |
3771 | { | |
3772 | switch (sig) { | |
cf3af59e MD |
3773 | case SIGPIPE: |
3774 | DBG("SIGPIPE catched"); | |
3775 | return; | |
3776 | case SIGINT: | |
3777 | DBG("SIGINT catched"); | |
3778 | stop_threads(); | |
3779 | break; | |
3780 | case SIGTERM: | |
3781 | DBG("SIGTERM catched"); | |
3782 | stop_threads(); | |
3783 | break; | |
3784 | default: | |
3785 | break; | |
fac6795d | 3786 | } |
fac6795d DG |
3787 | } |
3788 | ||
3789 | /* | |
d063d709 | 3790 | * Setup signal handler for : |
1d4b027a | 3791 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3792 | */ |
1d4b027a | 3793 | static int set_signal_handler(void) |
fac6795d | 3794 | { |
1d4b027a DG |
3795 | int ret = 0; |
3796 | struct sigaction sa; | |
3797 | sigset_t sigset; | |
fac6795d | 3798 | |
1d4b027a DG |
3799 | if ((ret = sigemptyset(&sigset)) < 0) { |
3800 | perror("sigemptyset"); | |
3801 | return ret; | |
3802 | } | |
d6f42150 | 3803 | |
1d4b027a DG |
3804 | sa.sa_handler = sighandler; |
3805 | sa.sa_mask = sigset; | |
3806 | sa.sa_flags = 0; | |
3807 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3808 | perror("sigaction"); | |
3809 | return ret; | |
d6f42150 DG |
3810 | } |
3811 | ||
1d4b027a DG |
3812 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3813 | perror("sigaction"); | |
3814 | return ret; | |
d6f42150 | 3815 | } |
aaf26714 | 3816 | |
1d4b027a DG |
3817 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3818 | perror("sigaction"); | |
3819 | return ret; | |
8c0faa1d DG |
3820 | } |
3821 | ||
1d4b027a DG |
3822 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3823 | ||
3824 | return ret; | |
fac6795d DG |
3825 | } |
3826 | ||
f3ed775e | 3827 | /* |
d063d709 DG |
3828 | * Set open files limit to unlimited. This daemon can open a large number of |
3829 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3830 | */ |
3831 | static void set_ulimit(void) | |
3832 | { | |
3833 | int ret; | |
3834 | struct rlimit lim; | |
3835 | ||
a88df331 | 3836 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3837 | lim.rlim_cur = 65535; |
3838 | lim.rlim_max = 65535; | |
3839 | ||
3840 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3841 | if (ret < 0) { | |
3842 | perror("failed to set open files limit"); | |
3843 | } | |
3844 | } | |
3845 | ||
fac6795d DG |
3846 | /* |
3847 | * main | |
3848 | */ | |
3849 | int main(int argc, char **argv) | |
3850 | { | |
fac6795d DG |
3851 | int ret = 0; |
3852 | void *status; | |
b082db07 | 3853 | const char *home_path; |
fac6795d | 3854 | |
f6a9efaa DG |
3855 | rcu_register_thread(); |
3856 | ||
273ea72c | 3857 | /* Create thread quit pipe */ |
cf3af59e MD |
3858 | if ((ret = init_thread_quit_pipe()) < 0) { |
3859 | goto error; | |
273ea72c DG |
3860 | } |
3861 | ||
fac6795d DG |
3862 | /* Parse arguments */ |
3863 | progname = argv[0]; | |
3864 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3865 | goto error; |
fac6795d DG |
3866 | } |
3867 | ||
3868 | /* Daemonize */ | |
3869 | if (opt_daemon) { | |
53094c05 DG |
3870 | ret = daemon(0, 0); |
3871 | if (ret < 0) { | |
3872 | perror("daemon"); | |
cf3af59e | 3873 | goto error; |
53094c05 | 3874 | } |
fac6795d DG |
3875 | } |
3876 | ||
3877 | /* Check if daemon is UID = 0 */ | |
3878 | is_root = !getuid(); | |
3879 | ||
fac6795d | 3880 | if (is_root) { |
d6f42150 DG |
3881 | ret = create_lttng_rundir(); |
3882 | if (ret < 0) { | |
cf3af59e | 3883 | goto error; |
d6f42150 DG |
3884 | } |
3885 | ||
fac6795d | 3886 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3887 | snprintf(apps_unix_sock_path, PATH_MAX, |
3888 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3889 | } |
3890 | ||
3891 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3892 | snprintf(client_unix_sock_path, PATH_MAX, |
3893 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3894 | } | |
0fdd1e2c DG |
3895 | |
3896 | /* Set global SHM for ust */ | |
3897 | if (strlen(wait_shm_path) == 0) { | |
3898 | snprintf(wait_shm_path, PATH_MAX, | |
3899 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3900 | } | |
fac6795d | 3901 | } else { |
b082db07 DG |
3902 | home_path = get_home_dir(); |
3903 | if (home_path == NULL) { | |
273ea72c DG |
3904 | /* TODO: Add --socket PATH option */ |
3905 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3906 | ret = -EPERM; |
3907 | goto error; | |
b082db07 DG |
3908 | } |
3909 | ||
fac6795d | 3910 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3911 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3912 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3913 | } |
3914 | ||
3915 | /* Set the cli tool unix socket path */ | |
3916 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3917 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3918 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3919 | } |
0fdd1e2c DG |
3920 | |
3921 | /* Set global SHM for ust */ | |
3922 | if (strlen(wait_shm_path) == 0) { | |
3923 | snprintf(wait_shm_path, PATH_MAX, | |
3924 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3925 | } | |
fac6795d DG |
3926 | } |
3927 | ||
847177cd DG |
3928 | DBG("Client socket path %s", client_unix_sock_path); |
3929 | DBG("Application socket path %s", apps_unix_sock_path); | |
3930 | ||
273ea72c | 3931 | /* |
7d8234d9 | 3932 | * See if daemon already exist. |
fac6795d | 3933 | */ |
7d8234d9 | 3934 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3935 | ERR("Already running daemon.\n"); |
273ea72c | 3936 | /* |
cf3af59e MD |
3937 | * We do not goto exit because we must not cleanup() |
3938 | * because a daemon is already running. | |
ab118b20 | 3939 | */ |
cf3af59e | 3940 | goto error; |
a88df331 DG |
3941 | } |
3942 | ||
54d01ffb | 3943 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
3944 | |
3945 | /* | |
3946 | * These actions must be executed as root. We do that *after* setting up | |
3947 | * the sockets path because we MUST make the check for another daemon using | |
3948 | * those paths *before* trying to set the kernel consumer sockets and init | |
3949 | * kernel tracer. | |
3950 | */ | |
3951 | if (is_root) { | |
3bd1e081 MD |
3952 | ret = set_consumer_sockets(&kconsumer_data); |
3953 | if (ret < 0) { | |
3954 | goto exit; | |
3955 | } | |
48842b30 | 3956 | |
3bd1e081 | 3957 | ret = set_consumer_sockets(&ustconsumer_data); |
a88df331 | 3958 | if (ret < 0) { |
cf3af59e | 3959 | goto exit; |
a88df331 | 3960 | } |
a88df331 DG |
3961 | /* Setup kernel tracer */ |
3962 | init_kernel_tracer(); | |
3963 | ||
3964 | /* Set ulimit for open files */ | |
3965 | set_ulimit(); | |
fac6795d DG |
3966 | } |
3967 | ||
cf3af59e MD |
3968 | if ((ret = set_signal_handler()) < 0) { |
3969 | goto exit; | |
fac6795d DG |
3970 | } |
3971 | ||
d6f42150 | 3972 | /* Setup the needed unix socket */ |
cf3af59e MD |
3973 | if ((ret = init_daemon_socket()) < 0) { |
3974 | goto exit; | |
fac6795d DG |
3975 | } |
3976 | ||
3977 | /* Set credentials to socket */ | |
cf3af59e MD |
3978 | if (is_root && ((ret = set_permissions()) < 0)) { |
3979 | goto exit; | |
fac6795d DG |
3980 | } |
3981 | ||
5b8719f5 DG |
3982 | /* Get parent pid if -S, --sig-parent is specified. */ |
3983 | if (opt_sig_parent) { | |
3984 | ppid = getppid(); | |
3985 | } | |
3986 | ||
7a485870 | 3987 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3988 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3989 | goto exit; | |
7a485870 DG |
3990 | } |
3991 | ||
099e26bd DG |
3992 | /* Setup the thread apps communication pipe. */ |
3993 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3994 | goto exit; | |
3995 | } | |
3996 | ||
3997 | /* Init UST command queue. */ | |
3998 | cds_wfq_init(&ust_cmd_queue.queue); | |
3999 | ||
f6a9efaa DG |
4000 | /* Init UST app hash table */ |
4001 | ust_app_ht_alloc(); | |
4002 | ||
273ea72c | 4003 | /* |
54d01ffb DG |
4004 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4005 | * statically declared in session.c | |
273ea72c | 4006 | */ |
54d01ffb | 4007 | session_list_ptr = session_get_list(); |
b5541356 | 4008 | |
5eb91c98 DG |
4009 | /* Set up max poll set size */ |
4010 | lttng_poll_set_max_size(); | |
4011 | ||
cf3af59e | 4012 | /* Create thread to manage the client socket */ |
099e26bd DG |
4013 | ret = pthread_create(&client_thread, NULL, |
4014 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4015 | if (ret != 0) { |
099e26bd | 4016 | perror("pthread_create clients"); |
cf3af59e MD |
4017 | goto exit_client; |
4018 | } | |
fac6795d | 4019 | |
099e26bd DG |
4020 | /* Create thread to dispatch registration */ |
4021 | ret = pthread_create(&dispatch_thread, NULL, | |
4022 | thread_dispatch_ust_registration, (void *) NULL); | |
4023 | if (ret != 0) { | |
4024 | perror("pthread_create dispatch"); | |
4025 | goto exit_dispatch; | |
4026 | } | |
4027 | ||
4028 | /* Create thread to manage application registration. */ | |
4029 | ret = pthread_create(®_apps_thread, NULL, | |
4030 | thread_registration_apps, (void *) NULL); | |
4031 | if (ret != 0) { | |
4032 | perror("pthread_create registration"); | |
4033 | goto exit_reg_apps; | |
4034 | } | |
4035 | ||
cf3af59e | 4036 | /* Create thread to manage application socket */ |
54d01ffb DG |
4037 | ret = pthread_create(&apps_thread, NULL, |
4038 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4039 | if (ret != 0) { |
099e26bd | 4040 | perror("pthread_create apps"); |
cf3af59e MD |
4041 | goto exit_apps; |
4042 | } | |
fac6795d | 4043 | |
cf3af59e | 4044 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4045 | ret = pthread_create(&kernel_thread, NULL, |
4046 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4047 | if (ret != 0) { |
099e26bd | 4048 | perror("pthread_create kernel"); |
cf3af59e MD |
4049 | goto exit_kernel; |
4050 | } | |
7a485870 | 4051 | |
cf3af59e MD |
4052 | ret = pthread_join(kernel_thread, &status); |
4053 | if (ret != 0) { | |
4054 | perror("pthread_join"); | |
4055 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4056 | } |
4057 | ||
cf3af59e MD |
4058 | exit_kernel: |
4059 | ret = pthread_join(apps_thread, &status); | |
4060 | if (ret != 0) { | |
4061 | perror("pthread_join"); | |
4062 | goto error; /* join error, exit without cleanup */ | |
4063 | } | |
fac6795d | 4064 | |
cf3af59e | 4065 | exit_apps: |
099e26bd DG |
4066 | ret = pthread_join(reg_apps_thread, &status); |
4067 | if (ret != 0) { | |
4068 | perror("pthread_join"); | |
4069 | goto error; /* join error, exit without cleanup */ | |
4070 | } | |
4071 | ||
4072 | exit_reg_apps: | |
4073 | ret = pthread_join(dispatch_thread, &status); | |
4074 | if (ret != 0) { | |
4075 | perror("pthread_join"); | |
4076 | goto error; /* join error, exit without cleanup */ | |
4077 | } | |
4078 | ||
4079 | exit_dispatch: | |
cf3af59e MD |
4080 | ret = pthread_join(client_thread, &status); |
4081 | if (ret != 0) { | |
4082 | perror("pthread_join"); | |
4083 | goto error; /* join error, exit without cleanup */ | |
4084 | } | |
4085 | ||
3bd1e081 | 4086 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4087 | if (ret != 0) { |
3bd1e081 | 4088 | perror("join_consumer"); |
cf3af59e MD |
4089 | goto error; /* join error, exit without cleanup */ |
4090 | } | |
a88df331 | 4091 | |
cf3af59e | 4092 | exit_client: |
a88df331 | 4093 | exit: |
cf3af59e MD |
4094 | /* |
4095 | * cleanup() is called when no other thread is running. | |
4096 | */ | |
f6a9efaa | 4097 | rcu_thread_online(); |
cf3af59e | 4098 | cleanup(); |
f6a9efaa DG |
4099 | rcu_thread_offline(); |
4100 | rcu_unregister_thread(); | |
cf3af59e MD |
4101 | if (!ret) |
4102 | exit(EXIT_SUCCESS); | |
4103 | error: | |
5e16da05 | 4104 | exit(EXIT_FAILURE); |
fac6795d | 4105 | } |