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 DG |
38 | #include <unistd.h> |
39 | ||
1e307fab | 40 | #include <ltt-kconsumerd.h> |
e88129fc | 41 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
42 | #include <lttng/lttng-kconsumerd.h> |
43 | #include <lttngerr.h> | |
fac6795d | 44 | |
54d01ffb | 45 | #include "channel.h" |
5eb91c98 | 46 | #include "compat/poll.h" |
099e26bd | 47 | #include "context.h" |
54d01ffb | 48 | #include "event.h" |
099e26bd | 49 | #include "futex.h" |
20fe2104 | 50 | #include "kernel-ctl.h" |
1e307fab | 51 | #include "ltt-sessiond.h" |
0fdd1e2c | 52 | #include "shm.h" |
91d76f53 | 53 | #include "traceable-app.h" |
1e307fab | 54 | #include "ust-ctl.h" |
8e68d1c8 | 55 | #include "utils.h" |
0177d773 | 56 | #include "ust-ctl.h" |
fac6795d | 57 | |
75462a81 | 58 | /* Const values */ |
686204ab | 59 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 60 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
61 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
62 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
63 | ||
fac6795d | 64 | /* Variables */ |
1d4b027a | 65 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 66 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 67 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 68 | |
fac6795d DG |
69 | const char *progname; |
70 | const char *opt_tracing_group; | |
5b8719f5 | 71 | static int opt_sig_parent; |
fac6795d DG |
72 | static int opt_daemon; |
73 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
74 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
75 | static pid_t kconsumerd_pid; | |
099e26bd | 76 | static int dispatch_thread_exit; |
fac6795d | 77 | |
54d01ffb DG |
78 | /* Global application Unix socket path */ |
79 | static char apps_unix_sock_path[PATH_MAX]; | |
80 | /* Global client Unix socket path */ | |
81 | static char client_unix_sock_path[PATH_MAX]; | |
82 | /* kconsumerd error and command Unix socket path */ | |
83 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; | |
84 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; | |
85 | /* global wait shm path for UST */ | |
86 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 87 | |
1d4b027a | 88 | /* Sockets and FDs */ |
d6f42150 DG |
89 | static int client_sock; |
90 | static int apps_sock; | |
91 | static int kconsumerd_err_sock; | |
8c0faa1d | 92 | static int kconsumerd_cmd_sock; |
20fe2104 | 93 | static int kernel_tracer_fd; |
7a485870 | 94 | static int kernel_poll_pipe[2]; |
1d4b027a | 95 | |
273ea72c DG |
96 | /* |
97 | * Quit pipe for all threads. This permits a single cancellation point | |
98 | * for all threads when receiving an event on the pipe. | |
99 | */ | |
100 | static int thread_quit_pipe[2]; | |
101 | ||
099e26bd DG |
102 | /* |
103 | * This pipe is used to inform the thread managing application communication | |
104 | * that a command is queued and ready to be processed. | |
105 | */ | |
106 | static int apps_cmd_pipe[2]; | |
107 | ||
1d4b027a | 108 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 109 | static pthread_t kconsumerd_thread; |
1d4b027a | 110 | static pthread_t apps_thread; |
099e26bd | 111 | static pthread_t reg_apps_thread; |
1d4b027a | 112 | static pthread_t client_thread; |
7a485870 | 113 | static pthread_t kernel_thread; |
099e26bd | 114 | static pthread_t dispatch_thread; |
8c0faa1d DG |
115 | static sem_t kconsumerd_sem; |
116 | ||
5eb91c98 DG |
117 | |
118 | /* Mutex to control kconsumerd pid assignation */ | |
119 | static pthread_mutex_t kconsumerd_pid_mutex; | |
fac6795d | 120 | |
099e26bd DG |
121 | /* |
122 | * UST registration command queue. This queue is tied with a futex and uses a N | |
123 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
124 | * | |
125 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
126 | * this queue and the wait/wake scheme. | |
127 | */ | |
128 | static struct ust_cmd_queue ust_cmd_queue; | |
129 | ||
b5541356 DG |
130 | /* |
131 | * Pointer initialized before thread creation. | |
132 | * | |
133 | * This points to the tracing session list containing the session count and a | |
134 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
135 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 136 | * |
d063d709 | 137 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 138 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
139 | */ |
140 | static struct ltt_session_list *session_list_ptr; | |
141 | ||
5eb91c98 DG |
142 | /* |
143 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
144 | */ | |
145 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
146 | unsigned int size) | |
147 | { | |
148 | int ret; | |
149 | ||
150 | if (events == NULL || size == 0) { | |
151 | ret = -1; | |
152 | goto error; | |
153 | } | |
154 | ||
155 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
156 | if (ret < 0) { | |
157 | goto error; | |
158 | } | |
159 | ||
160 | /* Add quit pipe */ | |
161 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
162 | if (ret < 0) { | |
163 | goto error; | |
164 | } | |
165 | ||
166 | return 0; | |
167 | ||
168 | error: | |
169 | return ret; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Check if the thread quit pipe was triggered. | |
174 | * | |
175 | * Return 1 if it was triggered else 0; | |
176 | */ | |
177 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
178 | { | |
179 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
180 | return 1; | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
0fdd1e2c DG |
186 | /* |
187 | * Remove modules in reverse load order. | |
188 | */ | |
189 | static int modprobe_remove_kernel_modules(void) | |
190 | { | |
191 | int ret = 0, i; | |
192 | char modprobe[256]; | |
193 | ||
194 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
195 | ret = snprintf(modprobe, sizeof(modprobe), | |
196 | "/sbin/modprobe --remove --quiet %s", | |
197 | kernel_modules_list[i].name); | |
198 | if (ret < 0) { | |
199 | perror("snprintf modprobe --remove"); | |
200 | goto error; | |
201 | } | |
202 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
203 | ret = system(modprobe); | |
204 | if (ret == -1) { | |
205 | ERR("Unable to launch modprobe --remove for module %s", | |
206 | kernel_modules_list[i].name); | |
207 | } else if (kernel_modules_list[i].required | |
208 | && WEXITSTATUS(ret) != 0) { | |
209 | ERR("Unable to remove module %s", | |
210 | kernel_modules_list[i].name); | |
211 | } else { | |
212 | DBG("Modprobe removal successful %s", | |
213 | kernel_modules_list[i].name); | |
214 | } | |
215 | } | |
216 | ||
217 | error: | |
218 | return ret; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Return group ID of the tracing group or -1 if not found. | |
223 | */ | |
996b65c8 MD |
224 | static gid_t allowed_group(void) |
225 | { | |
226 | struct group *grp; | |
227 | ||
274e143b MD |
228 | if (opt_tracing_group) { |
229 | grp = getgrnam(opt_tracing_group); | |
230 | } else { | |
231 | grp = getgrnam(default_tracing_group); | |
232 | } | |
996b65c8 MD |
233 | if (!grp) { |
234 | return -1; | |
235 | } else { | |
236 | return grp->gr_gid; | |
237 | } | |
238 | } | |
239 | ||
273ea72c | 240 | /* |
5eb91c98 | 241 | * Init thread quit pipe. |
273ea72c DG |
242 | * |
243 | * Return -1 on error or 0 if all pipes are created. | |
244 | */ | |
245 | static int init_thread_quit_pipe(void) | |
246 | { | |
247 | int ret; | |
248 | ||
249 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
250 | if (ret < 0) { | |
251 | perror("thread quit pipe"); | |
252 | goto error; | |
253 | } | |
254 | ||
255 | error: | |
256 | return ret; | |
257 | } | |
258 | ||
fac6795d | 259 | /* |
d063d709 DG |
260 | * Complete teardown of a kernel session. This free all data structure related |
261 | * to a kernel session and update counter. | |
fac6795d | 262 | */ |
1d4b027a | 263 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 264 | { |
1d4b027a DG |
265 | if (session->kernel_session != NULL) { |
266 | DBG("Tearing down kernel session"); | |
d9800920 DG |
267 | |
268 | /* | |
269 | * If a custom kernel consumer was registered, close the socket before | |
270 | * tearing down the complete kernel session structure | |
271 | */ | |
272 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
273 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
274 | } | |
275 | ||
62499ad6 | 276 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
277 | /* Extra precaution */ |
278 | session->kernel_session = NULL; | |
fac6795d | 279 | } |
fac6795d DG |
280 | } |
281 | ||
099e26bd DG |
282 | /* |
283 | * Stop all threads by closing the thread quit pipe. | |
284 | */ | |
cf3af59e MD |
285 | static void stop_threads(void) |
286 | { | |
5eb91c98 DG |
287 | int ret; |
288 | ||
cf3af59e MD |
289 | /* Stopping all threads */ |
290 | DBG("Terminating all threads"); | |
54d01ffb | 291 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
292 | if (ret < 0) { |
293 | ERR("write error on thread quit pipe"); | |
294 | } | |
295 | ||
099e26bd DG |
296 | /* Dispatch thread */ |
297 | dispatch_thread_exit = 1; | |
298 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
299 | } |
300 | ||
fac6795d | 301 | /* |
d063d709 | 302 | * Cleanup the daemon |
fac6795d | 303 | */ |
cf3af59e | 304 | static void cleanup(void) |
fac6795d | 305 | { |
1d4b027a DG |
306 | int ret; |
307 | char *cmd; | |
af9737e9 | 308 | struct ltt_session *sess, *stmp; |
fac6795d | 309 | |
1d4b027a | 310 | DBG("Cleaning up"); |
e07ae692 | 311 | |
1d4b027a | 312 | /* <fun> */ |
2f50c8a3 | 313 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
273ea72c DG |
314 | "Matthew, BEET driven development works!%c[%dm", |
315 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 316 | /* </fun> */ |
fac6795d | 317 | |
5eb91c98 DG |
318 | if (is_root) { |
319 | DBG("Removing %s directory", LTTNG_RUNDIR); | |
320 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
321 | if (ret < 0) { | |
322 | ERR("asprintf failed. Something is really wrong!"); | |
323 | } | |
5461b305 | 324 | |
5eb91c98 DG |
325 | /* Remove lttng run directory */ |
326 | ret = system(cmd); | |
327 | if (ret < 0) { | |
328 | ERR("Unable to clean " LTTNG_RUNDIR); | |
329 | } | |
1d4b027a | 330 | } |
5461b305 | 331 | |
1d4b027a | 332 | DBG("Cleaning up all session"); |
fac6795d | 333 | |
b5541356 | 334 | /* Destroy session list mutex */ |
273ea72c DG |
335 | if (session_list_ptr != NULL) { |
336 | pthread_mutex_destroy(&session_list_ptr->lock); | |
337 | ||
338 | /* Cleanup ALL session */ | |
54d01ffb DG |
339 | cds_list_for_each_entry_safe(sess, stmp, |
340 | &session_list_ptr->head, list) { | |
273ea72c DG |
341 | teardown_kernel_session(sess); |
342 | // TODO complete session cleanup (including UST) | |
343 | } | |
344 | } | |
345 | ||
099e26bd DG |
346 | DBG("Closing all UST sockets"); |
347 | clean_traceable_apps_list(); | |
348 | ||
273ea72c | 349 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
b5541356 | 350 | |
f3ed775e | 351 | DBG("Closing kernel fd"); |
1d4b027a | 352 | close(kernel_tracer_fd); |
ab147185 | 353 | |
2f50c8a3 DG |
354 | if (is_root) { |
355 | DBG("Unloading kernel modules"); | |
356 | modprobe_remove_kernel_modules(); | |
357 | } | |
5eb91c98 DG |
358 | |
359 | close(thread_quit_pipe[0]); | |
360 | close(thread_quit_pipe[1]); | |
fac6795d DG |
361 | } |
362 | ||
e065084a | 363 | /* |
d063d709 | 364 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 365 | * |
d063d709 | 366 | * Return lttcomm error code. |
e065084a DG |
367 | */ |
368 | static int send_unix_sock(int sock, void *buf, size_t len) | |
369 | { | |
370 | /* Check valid length */ | |
371 | if (len <= 0) { | |
372 | return -1; | |
373 | } | |
374 | ||
375 | return lttcomm_send_unix_sock(sock, buf, len); | |
376 | } | |
377 | ||
5461b305 | 378 | /* |
d063d709 | 379 | * Free memory of a command context structure. |
5461b305 | 380 | */ |
a2fb29a5 | 381 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 382 | { |
a2fb29a5 DG |
383 | DBG("Clean command context structure"); |
384 | if (*cmd_ctx) { | |
385 | if ((*cmd_ctx)->llm) { | |
386 | free((*cmd_ctx)->llm); | |
5461b305 | 387 | } |
a2fb29a5 DG |
388 | if ((*cmd_ctx)->lsm) { |
389 | free((*cmd_ctx)->lsm); | |
5461b305 | 390 | } |
a2fb29a5 DG |
391 | free(*cmd_ctx); |
392 | *cmd_ctx = NULL; | |
5461b305 DG |
393 | } |
394 | } | |
395 | ||
f3ed775e | 396 | /* |
d063d709 | 397 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 398 | */ |
54d01ffb DG |
399 | static int send_kconsumerd_channel_fds(int sock, |
400 | struct ltt_kernel_channel *channel) | |
f3ed775e DG |
401 | { |
402 | int ret; | |
403 | size_t nb_fd; | |
404 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
405 | struct lttcomm_kconsumerd_header lkh; |
406 | struct lttcomm_kconsumerd_msg lkm; | |
407 | ||
54d01ffb DG |
408 | DBG("Sending fds of channel %s to kernel consumer", |
409 | channel->channel->name); | |
7a485870 DG |
410 | |
411 | nb_fd = channel->stream_count; | |
f3ed775e DG |
412 | |
413 | /* Setup header */ | |
7a485870 | 414 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
415 | lkh.cmd_type = ADD_STREAM; |
416 | ||
417 | DBG("Sending kconsumerd header"); | |
418 | ||
54d01ffb DG |
419 | ret = lttcomm_send_unix_sock(sock, &lkh, |
420 | sizeof(struct lttcomm_kconsumerd_header)); | |
f3ed775e DG |
421 | if (ret < 0) { |
422 | perror("send kconsumerd header"); | |
423 | goto error; | |
424 | } | |
425 | ||
7a485870 DG |
426 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
427 | if (stream->fd != 0) { | |
f3ed775e DG |
428 | lkm.fd = stream->fd; |
429 | lkm.state = stream->state; | |
7a485870 | 430 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 431 | lkm.output = channel->channel->attr.output; |
f3ed775e | 432 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 433 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
434 | |
435 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
436 | ||
54d01ffb DG |
437 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, |
438 | &lkm.fd, 1, sizeof(lkm)); | |
f3ed775e DG |
439 | if (ret < 0) { |
440 | perror("send kconsumerd fd"); | |
441 | goto error; | |
442 | } | |
443 | } | |
444 | } | |
445 | ||
7a485870 | 446 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
447 | |
448 | return 0; | |
449 | ||
450 | error: | |
451 | return ret; | |
452 | } | |
453 | ||
454 | /* | |
d063d709 | 455 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 456 | */ |
d9800920 | 457 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
458 | { |
459 | int ret; | |
460 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
461 | struct lttcomm_kconsumerd_header lkh; |
462 | struct lttcomm_kconsumerd_msg lkm; | |
463 | ||
464 | /* Setup header */ | |
465 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
466 | lkh.cmd_type = ADD_STREAM; | |
467 | ||
468 | DBG("Sending kconsumerd header for metadata"); | |
469 | ||
54d01ffb DG |
470 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, |
471 | sizeof(struct lttcomm_kconsumerd_header)); | |
7a485870 DG |
472 | if (ret < 0) { |
473 | perror("send kconsumerd header"); | |
474 | goto error; | |
475 | } | |
476 | ||
477 | DBG("Sending metadata stream fd"); | |
478 | ||
d9800920 DG |
479 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
480 | if (session->consumer_fd == 0) { | |
481 | session->consumer_fd = kconsumerd_cmd_sock; | |
482 | } | |
483 | ||
7a485870 DG |
484 | if (session->metadata_stream_fd != 0) { |
485 | /* Send metadata stream fd first */ | |
486 | lkm.fd = session->metadata_stream_fd; | |
487 | lkm.state = ACTIVE_FD; | |
488 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 489 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 490 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 491 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 492 | |
54d01ffb DG |
493 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, |
494 | &lkm.fd, 1, sizeof(lkm)); | |
7a485870 DG |
495 | if (ret < 0) { |
496 | perror("send kconsumerd fd"); | |
497 | goto error; | |
498 | } | |
499 | } | |
f3ed775e | 500 | |
f3ed775e | 501 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 502 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 503 | if (ret < 0) { |
7a485870 | 504 | goto error; |
f3ed775e DG |
505 | } |
506 | } | |
507 | ||
7a485870 DG |
508 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
509 | ||
f3ed775e DG |
510 | return 0; |
511 | ||
512 | error: | |
513 | return ret; | |
514 | } | |
515 | ||
fac6795d | 516 | /* |
0fdd1e2c | 517 | * Notify UST applications using the shm mmap futex. |
fac6795d | 518 | */ |
0fdd1e2c | 519 | static int notify_ust_apps(int active) |
fac6795d | 520 | { |
0fdd1e2c | 521 | char *wait_shm_mmap; |
fac6795d | 522 | |
0fdd1e2c | 523 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 524 | |
0fdd1e2c DG |
525 | /* See shm.c for this call implying mmap, shm and futex calls */ |
526 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
527 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
528 | goto error; |
529 | } | |
530 | ||
0fdd1e2c DG |
531 | /* Wake waiting process */ |
532 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
533 | ||
534 | /* Apps notified successfully */ | |
535 | return 0; | |
fac6795d DG |
536 | |
537 | error: | |
0fdd1e2c | 538 | return -1; |
fac6795d DG |
539 | } |
540 | ||
e065084a | 541 | /* |
d063d709 DG |
542 | * Setup the outgoing data buffer for the response (llm) by allocating the |
543 | * right amount of memory and copying the original information from the lsm | |
544 | * structure. | |
ca95a216 | 545 | * |
d063d709 | 546 | * Return total size of the buffer pointed by buf. |
ca95a216 | 547 | */ |
5461b305 | 548 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 549 | { |
f3ed775e | 550 | int ret, buf_size; |
ca95a216 | 551 | |
f3ed775e | 552 | buf_size = size; |
5461b305 DG |
553 | |
554 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
555 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 556 | perror("malloc"); |
5461b305 | 557 | ret = -ENOMEM; |
ca95a216 DG |
558 | goto error; |
559 | } | |
560 | ||
5461b305 DG |
561 | /* Copy common data */ |
562 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 563 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 564 | |
5461b305 DG |
565 | cmd_ctx->llm->data_size = size; |
566 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
567 | ||
ca95a216 DG |
568 | return buf_size; |
569 | ||
570 | error: | |
571 | return ret; | |
572 | } | |
573 | ||
7a485870 | 574 | /* |
5eb91c98 | 575 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 576 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 577 | */ |
5eb91c98 | 578 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 579 | { |
5eb91c98 | 580 | int ret; |
7a485870 DG |
581 | struct ltt_session *session; |
582 | struct ltt_kernel_channel *channel; | |
583 | ||
5eb91c98 | 584 | DBG("Updating kernel poll set"); |
7a485870 | 585 | |
54d01ffb | 586 | session_lock_list(); |
b5541356 | 587 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 588 | session_lock(session); |
7a485870 | 589 | if (session->kernel_session == NULL) { |
54d01ffb | 590 | session_unlock(session); |
7a485870 DG |
591 | continue; |
592 | } | |
7a485870 | 593 | |
54d01ffb DG |
594 | cds_list_for_each_entry(channel, |
595 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
596 | /* Add channel fd to the kernel poll set */ |
597 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
598 | if (ret < 0) { | |
54d01ffb | 599 | session_unlock(session); |
5eb91c98 DG |
600 | goto error; |
601 | } | |
602 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 603 | } |
54d01ffb | 604 | session_unlock(session); |
7a485870 | 605 | } |
54d01ffb | 606 | session_unlock_list(); |
7a485870 | 607 | |
5eb91c98 | 608 | return 0; |
7a485870 DG |
609 | |
610 | error: | |
54d01ffb | 611 | session_unlock_list(); |
7a485870 DG |
612 | return -1; |
613 | } | |
614 | ||
615 | /* | |
54d01ffb | 616 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 617 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 618 | * |
d063d709 | 619 | * Useful for CPU hotplug feature. |
7a485870 DG |
620 | */ |
621 | static int update_kernel_stream(int fd) | |
622 | { | |
623 | int ret = 0; | |
624 | struct ltt_session *session; | |
625 | struct ltt_kernel_channel *channel; | |
626 | ||
627 | DBG("Updating kernel streams for channel fd %d", fd); | |
628 | ||
54d01ffb | 629 | session_lock_list(); |
b5541356 | 630 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 631 | session_lock(session); |
7a485870 | 632 | if (session->kernel_session == NULL) { |
54d01ffb | 633 | session_unlock(session); |
7a485870 DG |
634 | continue; |
635 | } | |
d9800920 DG |
636 | |
637 | /* This is not suppose to be 0 but this is an extra security check */ | |
638 | if (session->kernel_session->consumer_fd == 0) { | |
639 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
640 | } | |
641 | ||
5eb91c98 DG |
642 | cds_list_for_each_entry(channel, |
643 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
644 | if (channel->fd == fd) { |
645 | DBG("Channel found, updating kernel streams"); | |
646 | ret = kernel_open_channel_stream(channel); | |
647 | if (ret < 0) { | |
b3c750d2 | 648 | goto error; |
7a485870 | 649 | } |
d9800920 | 650 | |
7a485870 | 651 | /* |
5eb91c98 DG |
652 | * Have we already sent fds to the consumer? If yes, it means |
653 | * that tracing is started so it is safe to send our updated | |
654 | * stream fds. | |
7a485870 DG |
655 | */ |
656 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
5eb91c98 DG |
657 | ret = send_kconsumerd_channel_fds( |
658 | session->kernel_session->consumer_fd, channel); | |
7a485870 | 659 | if (ret < 0) { |
b3c750d2 | 660 | goto error; |
7a485870 DG |
661 | } |
662 | } | |
b3c750d2 | 663 | goto error; |
7a485870 DG |
664 | } |
665 | } | |
54d01ffb | 666 | session_unlock(session); |
7a485870 | 667 | } |
54d01ffb | 668 | session_unlock_list(); |
b3c750d2 | 669 | return ret; |
7a485870 | 670 | |
b3c750d2 | 671 | error: |
54d01ffb DG |
672 | session_unlock(session); |
673 | session_unlock_list(); | |
7a485870 DG |
674 | return ret; |
675 | } | |
676 | ||
677 | /* | |
d063d709 | 678 | * This thread manage event coming from the kernel. |
7a485870 | 679 | * |
d063d709 DG |
680 | * Features supported in this thread: |
681 | * -) CPU Hotplug | |
7a485870 DG |
682 | */ |
683 | static void *thread_manage_kernel(void *data) | |
684 | { | |
5eb91c98 DG |
685 | int ret, i, pollfd, update_poll_flag = 1; |
686 | uint32_t revents, nb_fd; | |
7a485870 | 687 | char tmp; |
5eb91c98 | 688 | struct lttng_poll_event events; |
7a485870 DG |
689 | |
690 | DBG("Thread manage kernel started"); | |
691 | ||
5eb91c98 DG |
692 | ret = create_thread_poll_set(&events, 2); |
693 | if (ret < 0) { | |
694 | goto error; | |
695 | } | |
696 | ||
697 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
698 | if (ret < 0) { | |
699 | goto error; | |
700 | } | |
701 | ||
7a485870 DG |
702 | while (1) { |
703 | if (update_poll_flag == 1) { | |
5eb91c98 DG |
704 | ret = update_kernel_poll(&events); |
705 | if (ret < 0) { | |
7a485870 DG |
706 | goto error; |
707 | } | |
708 | update_poll_flag = 0; | |
709 | } | |
710 | ||
5eb91c98 DG |
711 | nb_fd = LTTNG_POLL_GETNB(&events); |
712 | ||
713 | DBG("Thread kernel polling on %d fds", nb_fd); | |
714 | ||
715 | /* Zeroed the poll events */ | |
716 | lttng_poll_reset(&events); | |
7a485870 DG |
717 | |
718 | /* Poll infinite value of time */ | |
5eb91c98 | 719 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 720 | if (ret < 0) { |
7a485870 DG |
721 | goto error; |
722 | } else if (ret == 0) { | |
723 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
724 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
725 | "This should not have happened! Continuing..."); | |
7a485870 DG |
726 | continue; |
727 | } | |
728 | ||
5eb91c98 DG |
729 | for (i = 0; i < nb_fd; i++) { |
730 | /* Fetch once the poll data */ | |
731 | revents = LTTNG_POLL_GETEV(&events, i); | |
732 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 733 | |
5eb91c98 DG |
734 | /* Thread quit pipe has been closed. Killing thread. */ |
735 | ret = check_thread_quit_pipe(pollfd, revents); | |
736 | if (ret) { | |
737 | goto error; | |
738 | } | |
7a485870 | 739 | |
5eb91c98 DG |
740 | /* Check for data on kernel pipe */ |
741 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
742 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
743 | update_poll_flag = 1; | |
744 | continue; | |
745 | } else { | |
746 | /* | |
747 | * New CPU detected by the kernel. Adding kernel stream to | |
748 | * kernel session and updating the kernel consumer | |
749 | */ | |
750 | if (revents & LPOLLIN) { | |
751 | ret = update_kernel_stream(pollfd); | |
752 | if (ret < 0) { | |
753 | continue; | |
754 | } | |
755 | break; | |
756 | /* | |
757 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
758 | * and unregister kernel stream at this point. | |
759 | */ | |
7a485870 | 760 | } |
7a485870 DG |
761 | } |
762 | } | |
763 | } | |
764 | ||
765 | error: | |
766 | DBG("Kernel thread dying"); | |
273ea72c DG |
767 | close(kernel_poll_pipe[0]); |
768 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
769 | |
770 | lttng_poll_clean(&events); | |
771 | ||
7a485870 DG |
772 | return NULL; |
773 | } | |
774 | ||
1d4b027a | 775 | /* |
d063d709 | 776 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
777 | */ |
778 | static void *thread_manage_kconsumerd(void *data) | |
779 | { | |
5eb91c98 DG |
780 | int sock = 0, i, ret, pollfd; |
781 | uint32_t revents, nb_fd; | |
1d4b027a | 782 | enum lttcomm_return_code code; |
5eb91c98 | 783 | struct lttng_poll_event events; |
1d4b027a DG |
784 | |
785 | DBG("[thread] Manage kconsumerd started"); | |
786 | ||
787 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
788 | if (ret < 0) { | |
789 | goto error; | |
790 | } | |
791 | ||
5eb91c98 DG |
792 | /* |
793 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
794 | * Nothing more will be added to this poll set. | |
795 | */ | |
796 | ret = create_thread_poll_set(&events, 2); | |
797 | if (ret < 0) { | |
798 | goto error; | |
799 | } | |
273ea72c | 800 | |
5eb91c98 DG |
801 | ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP); |
802 | if (ret < 0) { | |
803 | goto error; | |
804 | } | |
805 | ||
806 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
807 | |
808 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 809 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 810 | if (ret < 0) { |
273ea72c DG |
811 | goto error; |
812 | } | |
813 | ||
5eb91c98 DG |
814 | for (i = 0; i < nb_fd; i++) { |
815 | /* Fetch once the poll data */ | |
816 | revents = LTTNG_POLL_GETEV(&events, i); | |
817 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
818 | ||
819 | /* Thread quit pipe has been closed. Killing thread. */ | |
820 | ret = check_thread_quit_pipe(pollfd, revents); | |
821 | if (ret) { | |
822 | goto error; | |
823 | } | |
824 | ||
825 | /* Event on the registration socket */ | |
826 | if (pollfd == kconsumerd_err_sock) { | |
827 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
828 | ERR("Kconsumerd err socket poll error"); | |
829 | goto error; | |
830 | } | |
831 | } | |
273ea72c DG |
832 | } |
833 | ||
1d4b027a DG |
834 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
835 | if (sock < 0) { | |
836 | goto error; | |
837 | } | |
838 | ||
712ea556 | 839 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
840 | ret = lttcomm_recv_unix_sock(sock, &code, |
841 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
842 | if (ret <= 0) { |
843 | goto error; | |
844 | } | |
845 | ||
846 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
54d01ffb DG |
847 | kconsumerd_cmd_sock = |
848 | lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
1d4b027a | 849 | if (kconsumerd_cmd_sock < 0) { |
712ea556 | 850 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
851 | perror("kconsumerd connect"); |
852 | goto error; | |
853 | } | |
854 | /* Signal condition to tell that the kconsumerd is ready */ | |
855 | sem_post(&kconsumerd_sem); | |
856 | DBG("Kconsumerd command socket ready"); | |
857 | } else { | |
6f61d021 | 858 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
859 | lttcomm_get_readable_code(-code)); |
860 | goto error; | |
861 | } | |
862 | ||
54d01ffb | 863 | /* Remove the kconsumerd error sock since we've established a connexion */ |
5eb91c98 | 864 | ret = lttng_poll_del(&events, kconsumerd_err_sock); |
72079cae | 865 | if (ret < 0) { |
72079cae DG |
866 | goto error; |
867 | } | |
868 | ||
5eb91c98 DG |
869 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
870 | if (ret < 0) { | |
72079cae | 871 | goto error; |
5eb91c98 DG |
872 | } |
873 | ||
874 | /* Update number of fd */ | |
875 | nb_fd = LTTNG_POLL_GETNB(&events); | |
876 | ||
877 | /* Inifinite blocking call, waiting for transmission */ | |
878 | ret = lttng_poll_wait(&events, -1); | |
879 | if (ret < 0) { | |
72079cae DG |
880 | goto error; |
881 | } | |
882 | ||
5eb91c98 DG |
883 | for (i = 0; i < nb_fd; i++) { |
884 | /* Fetch once the poll data */ | |
885 | revents = LTTNG_POLL_GETEV(&events, i); | |
886 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
887 | ||
888 | /* Thread quit pipe has been closed. Killing thread. */ | |
889 | ret = check_thread_quit_pipe(pollfd, revents); | |
890 | if (ret) { | |
891 | goto error; | |
892 | } | |
893 | ||
894 | /* Event on the kconsumerd socket */ | |
895 | if (pollfd == sock) { | |
896 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
897 | ERR("Kconsumerd err socket second poll error"); | |
898 | goto error; | |
899 | } | |
900 | } | |
901 | } | |
902 | ||
712ea556 | 903 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
904 | ret = lttcomm_recv_unix_sock(sock, &code, |
905 | sizeof(enum lttcomm_return_code)); | |
712ea556 DG |
906 | if (ret <= 0) { |
907 | ERR("Kconsumerd closed the command socket"); | |
908 | goto error; | |
6f61d021 | 909 | } |
1d4b027a | 910 | |
712ea556 DG |
911 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
912 | ||
1d4b027a | 913 | error: |
6f61d021 | 914 | DBG("Kconsumerd thread dying"); |
5eb91c98 DG |
915 | close(kconsumerd_err_sock); |
916 | close(kconsumerd_cmd_sock); | |
917 | close(sock); | |
273ea72c DG |
918 | |
919 | unlink(kconsumerd_err_unix_sock_path); | |
920 | unlink(kconsumerd_cmd_unix_sock_path); | |
273ea72c | 921 | kconsumerd_pid = 0; |
1d4b027a | 922 | |
5eb91c98 | 923 | lttng_poll_clean(&events); |
0177d773 | 924 | |
5eb91c98 | 925 | return NULL; |
099e26bd DG |
926 | } |
927 | ||
099e26bd DG |
928 | /* |
929 | * This thread manage application communication. | |
1d4b027a DG |
930 | */ |
931 | static void *thread_manage_apps(void *data) | |
099e26bd | 932 | { |
5eb91c98 DG |
933 | int i, ret, pollfd; |
934 | uint32_t revents, nb_fd; | |
099e26bd | 935 | struct ust_command ust_cmd; |
5eb91c98 | 936 | struct lttng_poll_event events; |
099e26bd DG |
937 | |
938 | DBG("[thread] Manage application started"); | |
939 | ||
5eb91c98 DG |
940 | ret = create_thread_poll_set(&events, 2); |
941 | if (ret < 0) { | |
942 | goto error; | |
943 | } | |
099e26bd | 944 | |
5eb91c98 DG |
945 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
946 | if (ret < 0) { | |
947 | goto error; | |
948 | } | |
099e26bd | 949 | |
5eb91c98 DG |
950 | while (1) { |
951 | /* Zeroed the events structure */ | |
952 | lttng_poll_reset(&events); | |
0177d773 | 953 | |
5eb91c98 | 954 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
955 | |
956 | DBG("Apps thread polling on %d fds", nb_fd); | |
957 | ||
958 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 959 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 960 | if (ret < 0) { |
099e26bd DG |
961 | goto error; |
962 | } | |
963 | ||
5eb91c98 DG |
964 | for (i = 0; i < nb_fd; i++) { |
965 | /* Fetch once the poll data */ | |
966 | revents = LTTNG_POLL_GETEV(&events, i); | |
967 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
968 | ||
969 | /* Thread quit pipe has been closed. Killing thread. */ | |
970 | ret = check_thread_quit_pipe(pollfd, revents); | |
971 | if (ret) { | |
099e26bd | 972 | goto error; |
5eb91c98 | 973 | } |
099e26bd | 974 | |
5eb91c98 DG |
975 | /* Inspect the apps cmd pipe */ |
976 | if (pollfd == apps_cmd_pipe[0]) { | |
977 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
978 | ERR("Apps command pipe error"); | |
0177d773 | 979 | goto error; |
5eb91c98 DG |
980 | } else if (revents & LPOLLIN) { |
981 | /* Empty pipe */ | |
982 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
983 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
984 | perror("read apps cmd pipe"); | |
985 | goto error; | |
986 | } | |
099e26bd | 987 | |
5eb91c98 | 988 | /* Register applicaton to the session daemon */ |
54d01ffb DG |
989 | ret = register_traceable_app(&ust_cmd.reg_msg, |
990 | ust_cmd.sock); | |
5eb91c98 DG |
991 | if (ret < 0) { |
992 | /* Only critical ENOMEM error can be returned here */ | |
993 | goto error; | |
994 | } | |
995 | ||
996 | ret = ustctl_register_done(ust_cmd.sock); | |
997 | if (ret < 0) { | |
998 | /* | |
999 | * If the registration is not possible, we simply | |
1000 | * unregister the apps and continue | |
1001 | */ | |
1002 | unregister_traceable_app(ust_cmd.sock); | |
1003 | } else { | |
1004 | /* | |
1005 | * We just need here to monitor the close of the UST | |
1006 | * socket and poll set monitor those by default. | |
1007 | */ | |
1008 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1009 | if (ret < 0) { | |
1010 | goto error; | |
1011 | } | |
1012 | ||
54d01ffb DG |
1013 | DBG("Apps with sock %d added to poll set", |
1014 | ust_cmd.sock); | |
5eb91c98 DG |
1015 | } |
1016 | break; | |
0177d773 | 1017 | } |
5eb91c98 DG |
1018 | } else { |
1019 | /* | |
54d01ffb DG |
1020 | * At this point, we know that a registered application made |
1021 | * the event at poll_wait. | |
5eb91c98 DG |
1022 | */ |
1023 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1024 | /* Removing from the poll set */ | |
1025 | ret = lttng_poll_del(&events, pollfd); | |
1026 | if (ret < 0) { | |
1027 | goto error; | |
1028 | } | |
099e26bd | 1029 | |
5eb91c98 DG |
1030 | /* Socket closed */ |
1031 | unregister_traceable_app(pollfd); | |
1032 | break; | |
1033 | } | |
099e26bd DG |
1034 | } |
1035 | } | |
099e26bd DG |
1036 | } |
1037 | ||
1038 | error: | |
1039 | DBG("Application communication apps dying"); | |
1040 | close(apps_cmd_pipe[0]); | |
1041 | close(apps_cmd_pipe[1]); | |
1042 | ||
5eb91c98 | 1043 | lttng_poll_clean(&events); |
099e26bd DG |
1044 | |
1045 | return NULL; | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * Dispatch request from the registration threads to the application | |
1050 | * communication thread. | |
1051 | */ | |
1052 | static void *thread_dispatch_ust_registration(void *data) | |
1053 | { | |
1054 | int ret; | |
1055 | struct cds_wfq_node *node; | |
1056 | struct ust_command *ust_cmd = NULL; | |
1057 | ||
1058 | DBG("[thread] Dispatch UST command started"); | |
1059 | ||
1060 | while (!dispatch_thread_exit) { | |
1061 | /* Atomically prepare the queue futex */ | |
1062 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1063 | ||
1064 | do { | |
1065 | /* Dequeue command for registration */ | |
1066 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1067 | if (node == NULL) { | |
1068 | DBG("Waked up but nothing in the UST command queue"); | |
1069 | /* Continue thread execution */ | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1074 | ||
2f50c8a3 DG |
1075 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1076 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1077 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1078 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1079 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1080 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1081 | /* |
1082 | * Inform apps thread of the new application registration. This | |
1083 | * call is blocking so we can be assured that the data will be read | |
1084 | * at some point in time or wait to the end of the world :) | |
1085 | */ | |
1086 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1087 | sizeof(struct ust_command)); | |
1088 | if (ret < 0) { | |
1089 | perror("write apps cmd pipe"); | |
1090 | if (errno == EBADF) { | |
1091 | /* | |
1092 | * We can't inform the application thread to process | |
1093 | * registration. We will exit or else application | |
1094 | * registration will not occur and tracing will never | |
1095 | * start. | |
1096 | */ | |
1097 | goto error; | |
1098 | } | |
1099 | } | |
1100 | free(ust_cmd); | |
1101 | } while (node != NULL); | |
1102 | ||
1103 | /* Futex wait on queue. Blocking call on futex() */ | |
1104 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1105 | } | |
1106 | ||
1107 | error: | |
1108 | DBG("Dispatch thread dying"); | |
1109 | return NULL; | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * This thread manage application registration. | |
1114 | */ | |
1115 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1116 | { |
5eb91c98 DG |
1117 | int sock = 0, i, ret, pollfd; |
1118 | uint32_t revents, nb_fd; | |
1119 | struct lttng_poll_event events; | |
099e26bd DG |
1120 | /* |
1121 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1122 | * freed in the manage apps thread. | |
1123 | */ | |
1124 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1125 | |
099e26bd | 1126 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1127 | |
1128 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1129 | if (ret < 0) { | |
1130 | goto error; | |
1131 | } | |
1132 | ||
5eb91c98 DG |
1133 | /* |
1134 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1135 | * more will be added to this poll set. | |
1136 | */ | |
1137 | ret = create_thread_poll_set(&events, 2); | |
1138 | if (ret < 0) { | |
1139 | goto error; | |
1140 | } | |
273ea72c | 1141 | |
5eb91c98 DG |
1142 | /* Add the application registration socket */ |
1143 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1144 | if (ret < 0) { | |
1145 | goto error; | |
1146 | } | |
273ea72c | 1147 | |
1d4b027a | 1148 | /* Notify all applications to register */ |
0fdd1e2c DG |
1149 | ret = notify_ust_apps(1); |
1150 | if (ret < 0) { | |
1151 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1152 | "Execution continues but there might be problem for already\n" |
1153 | "running applications that wishes to register."); | |
0fdd1e2c | 1154 | } |
1d4b027a DG |
1155 | |
1156 | while (1) { | |
1157 | DBG("Accepting application registration"); | |
273ea72c | 1158 | |
5eb91c98 DG |
1159 | nb_fd = LTTNG_POLL_GETNB(&events); |
1160 | ||
273ea72c | 1161 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1162 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1163 | if (ret < 0) { |
273ea72c DG |
1164 | goto error; |
1165 | } | |
1166 | ||
5eb91c98 DG |
1167 | for (i = 0; i < nb_fd; i++) { |
1168 | /* Fetch once the poll data */ | |
1169 | revents = LTTNG_POLL_GETEV(&events, i); | |
1170 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1171 | |
5eb91c98 DG |
1172 | /* Thread quit pipe has been closed. Killing thread. */ |
1173 | ret = check_thread_quit_pipe(pollfd, revents); | |
1174 | if (ret) { | |
90014c57 DG |
1175 | goto error; |
1176 | } | |
1d4b027a | 1177 | |
5eb91c98 DG |
1178 | /* Event on the registration socket */ |
1179 | if (pollfd == apps_sock) { | |
1180 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1181 | ERR("Register apps socket poll error"); | |
1182 | goto error; | |
1183 | } else if (revents & LPOLLIN) { | |
1184 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1185 | if (sock < 0) { | |
1186 | goto error; | |
1187 | } | |
099e26bd | 1188 | |
5eb91c98 DG |
1189 | /* Create UST registration command for enqueuing */ |
1190 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1191 | if (ust_cmd == NULL) { | |
1192 | perror("ust command malloc"); | |
1193 | goto error; | |
1194 | } | |
1d4b027a | 1195 | |
5eb91c98 DG |
1196 | /* |
1197 | * Using message-based transmissions to ensure we don't | |
1198 | * have to deal with partially received messages. | |
1199 | */ | |
1200 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1201 | sizeof(struct ust_register_msg)); | |
1202 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1203 | if (ret < 0) { | |
1204 | perror("lttcomm_recv_unix_sock register apps"); | |
1205 | } else { | |
1206 | ERR("Wrong size received on apps register"); | |
1207 | } | |
1208 | free(ust_cmd); | |
1209 | close(sock); | |
1210 | continue; | |
1211 | } | |
099e26bd | 1212 | |
5eb91c98 | 1213 | ust_cmd->sock = sock; |
099e26bd | 1214 | |
5eb91c98 DG |
1215 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1216 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1217 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1218 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1219 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1220 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1221 | |
5eb91c98 DG |
1222 | /* |
1223 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1224 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1225 | */ |
1226 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1227 | ||
1228 | /* | |
1229 | * Wake the registration queue futex. Implicit memory | |
1230 | * barrier with the exchange in cds_wfq_enqueue. | |
1231 | */ | |
1232 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1233 | } | |
1234 | } | |
90014c57 | 1235 | } |
1d4b027a DG |
1236 | } |
1237 | ||
1238 | error: | |
0fdd1e2c DG |
1239 | DBG("UST Registration thread dying"); |
1240 | ||
1241 | /* Notify that the registration thread is gone */ | |
1242 | notify_ust_apps(0); | |
1243 | ||
1244 | close(apps_sock); | |
1245 | close(sock); | |
273ea72c | 1246 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1247 | |
5eb91c98 DG |
1248 | lttng_poll_clean(&events); |
1249 | ||
1d4b027a DG |
1250 | return NULL; |
1251 | } | |
1252 | ||
8c0faa1d | 1253 | /* |
d063d709 DG |
1254 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1255 | * exec or it will fails. | |
8c0faa1d | 1256 | */ |
693bd40b | 1257 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1258 | { |
1259 | int ret; | |
1260 | ||
1261 | /* Setup semaphore */ | |
1262 | sem_init(&kconsumerd_sem, 0, 0); | |
1263 | ||
54d01ffb DG |
1264 | ret = pthread_create(&kconsumerd_thread, NULL, |
1265 | thread_manage_kconsumerd, (void *) NULL); | |
8c0faa1d DG |
1266 | if (ret != 0) { |
1267 | perror("pthread_create kconsumerd"); | |
1268 | goto error; | |
1269 | } | |
1270 | ||
693bd40b | 1271 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1272 | sem_wait(&kconsumerd_sem); |
1273 | ||
712ea556 DG |
1274 | if (kconsumerd_pid == 0) { |
1275 | ERR("Kconsumerd did not start"); | |
1276 | goto error; | |
1277 | } | |
1278 | ||
8c0faa1d DG |
1279 | return 0; |
1280 | ||
1281 | error: | |
712ea556 | 1282 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1283 | return ret; |
1284 | } | |
1285 | ||
d9800920 DG |
1286 | /* |
1287 | * Join kernel consumer thread | |
1288 | */ | |
cf3af59e MD |
1289 | static int join_kconsumerd_thread(void) |
1290 | { | |
1291 | void *status; | |
1292 | int ret; | |
1293 | ||
1294 | if (kconsumerd_pid != 0) { | |
1295 | ret = kill(kconsumerd_pid, SIGTERM); | |
1296 | if (ret) { | |
1297 | ERR("Error killing kconsumerd"); | |
1298 | return ret; | |
1299 | } | |
1300 | return pthread_join(kconsumerd_thread, &status); | |
1301 | } else { | |
1302 | return 0; | |
1303 | } | |
1304 | } | |
1305 | ||
8c0faa1d | 1306 | /* |
d063d709 | 1307 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1308 | * |
d063d709 | 1309 | * Return pid if successful else -1. |
8c0faa1d | 1310 | */ |
693bd40b | 1311 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1312 | { |
1313 | int ret; | |
1314 | pid_t pid; | |
53086306 | 1315 | const char *verbosity; |
8c0faa1d | 1316 | |
c49dc785 DG |
1317 | DBG("Spawning kconsumerd"); |
1318 | ||
8c0faa1d DG |
1319 | pid = fork(); |
1320 | if (pid == 0) { | |
1321 | /* | |
1322 | * Exec kconsumerd. | |
1323 | */ | |
31f73cc9 | 1324 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1325 | verbosity = "--verbose"; |
1326 | } else { | |
1327 | verbosity = "--quiet"; | |
1328 | } | |
54d01ffb DG |
1329 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", |
1330 | "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1331 | if (errno != 0) { |
1332 | perror("kernel start consumer exec"); | |
1333 | } | |
1334 | exit(EXIT_FAILURE); | |
1335 | } else if (pid > 0) { | |
1336 | ret = pid; | |
1337 | goto error; | |
1338 | } else { | |
1339 | perror("kernel start consumer fork"); | |
1340 | ret = -errno; | |
1341 | goto error; | |
1342 | } | |
1343 | ||
1344 | error: | |
1345 | return ret; | |
1346 | } | |
1347 | ||
693bd40b | 1348 | /* |
d063d709 | 1349 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1350 | */ |
1351 | static int start_kconsumerd(void) | |
1352 | { | |
1353 | int ret; | |
1354 | ||
693bd40b | 1355 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1356 | if (kconsumerd_pid != 0) { |
817153bb | 1357 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1358 | goto end; |
1359 | } | |
693bd40b | 1360 | |
c49dc785 DG |
1361 | ret = spawn_kconsumerd(); |
1362 | if (ret < 0) { | |
1363 | ERR("Spawning kconsumerd failed"); | |
1364 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1365 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1366 | goto error; | |
693bd40b | 1367 | } |
c49dc785 DG |
1368 | |
1369 | /* Setting up the global kconsumerd_pid */ | |
1370 | kconsumerd_pid = ret; | |
693bd40b DG |
1371 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1372 | ||
6f61d021 DG |
1373 | DBG("Kconsumerd pid %d", ret); |
1374 | ||
693bd40b | 1375 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1376 | ret = spawn_kconsumerd_thread(); |
1377 | if (ret < 0) { | |
1378 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1379 | goto error; |
1380 | } | |
1381 | ||
c49dc785 | 1382 | end: |
693bd40b DG |
1383 | return 0; |
1384 | ||
1385 | error: | |
1386 | return ret; | |
1387 | } | |
1388 | ||
b73401da | 1389 | /* |
d063d709 | 1390 | * modprobe_kernel_modules |
b73401da DG |
1391 | */ |
1392 | static int modprobe_kernel_modules(void) | |
1393 | { | |
ab147185 | 1394 | int ret = 0, i; |
b73401da DG |
1395 | char modprobe[256]; |
1396 | ||
ab147185 MD |
1397 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1398 | ret = snprintf(modprobe, sizeof(modprobe), | |
1399 | "/sbin/modprobe %s%s", | |
1400 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1401 | kernel_modules_list[i].name); | |
b73401da DG |
1402 | if (ret < 0) { |
1403 | perror("snprintf modprobe"); | |
1404 | goto error; | |
1405 | } | |
ab147185 | 1406 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1407 | ret = system(modprobe); |
ab147185 MD |
1408 | if (ret == -1) { |
1409 | ERR("Unable to launch modprobe for module %s", | |
1410 | kernel_modules_list[i].name); | |
1411 | } else if (kernel_modules_list[i].required | |
d9800920 | 1412 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1413 | ERR("Unable to load module %s", |
1414 | kernel_modules_list[i].name); | |
1415 | } else { | |
1416 | DBG("Modprobe successfully %s", | |
1417 | kernel_modules_list[i].name); | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | error: | |
1422 | return ret; | |
1423 | } | |
1424 | ||
b73401da | 1425 | /* |
d063d709 | 1426 | * mount_debugfs |
b73401da DG |
1427 | */ |
1428 | static int mount_debugfs(char *path) | |
1429 | { | |
1430 | int ret; | |
1431 | char *type = "debugfs"; | |
1432 | ||
996b65c8 | 1433 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1434 | if (ret < 0) { |
1435 | goto error; | |
1436 | } | |
1437 | ||
1438 | ret = mount(type, path, type, 0, NULL); | |
1439 | if (ret < 0) { | |
1440 | perror("mount debugfs"); | |
1441 | goto error; | |
1442 | } | |
1443 | ||
1444 | DBG("Mounted debugfs successfully at %s", path); | |
1445 | ||
1446 | error: | |
1447 | return ret; | |
1448 | } | |
1449 | ||
8c0faa1d | 1450 | /* |
d063d709 | 1451 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1452 | */ |
f3ed775e | 1453 | static void init_kernel_tracer(void) |
8c0faa1d | 1454 | { |
b73401da DG |
1455 | int ret; |
1456 | char *proc_mounts = "/proc/mounts"; | |
1457 | char line[256]; | |
684d34d2 | 1458 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1459 | FILE *fp; |
1460 | ||
1461 | /* Detect debugfs */ | |
1462 | fp = fopen(proc_mounts, "r"); | |
1463 | if (fp == NULL) { | |
1464 | ERR("Unable to probe %s", proc_mounts); | |
1465 | goto error; | |
1466 | } | |
1467 | ||
1468 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1469 | if (strstr(line, "debugfs") != NULL) { | |
1470 | /* Remove first string */ | |
1471 | strtok(line, " "); | |
1472 | /* Dup string here so we can reuse line later on */ | |
1473 | debugfs_path = strdup(strtok(NULL, " ")); | |
1474 | DBG("Got debugfs path : %s", debugfs_path); | |
1475 | break; | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | fclose(fp); | |
1480 | ||
1481 | /* Mount debugfs if needded */ | |
1482 | if (debugfs_path == NULL) { | |
1483 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1484 | if (ret < 0) { | |
1485 | perror("asprintf debugfs path"); | |
1486 | goto error; | |
1487 | } | |
1488 | ret = mount_debugfs(debugfs_path); | |
1489 | if (ret < 0) { | |
1490 | goto error; | |
1491 | } | |
1492 | } | |
1493 | ||
1494 | /* Modprobe lttng kernel modules */ | |
1495 | ret = modprobe_kernel_modules(); | |
1496 | if (ret < 0) { | |
1497 | goto error; | |
1498 | } | |
1499 | ||
1500 | /* Setup lttng kernel path */ | |
1501 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1502 | if (ret < 0) { | |
1503 | perror("asprintf lttng path"); | |
1504 | goto error; | |
1505 | } | |
1506 | ||
1507 | /* Open debugfs lttng */ | |
1508 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1509 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1510 | DBG("Failed to open %s", lttng_path); |
1511 | goto error; | |
8c0faa1d DG |
1512 | } |
1513 | ||
b73401da DG |
1514 | free(lttng_path); |
1515 | free(debugfs_path); | |
f3ed775e | 1516 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1517 | return; |
1518 | ||
1519 | error: | |
1520 | if (lttng_path) { | |
1521 | free(lttng_path); | |
1522 | } | |
1523 | if (debugfs_path) { | |
1524 | free(debugfs_path); | |
1525 | } | |
1526 | WARN("No kernel tracer available"); | |
1527 | kernel_tracer_fd = 0; | |
1528 | return; | |
f3ed775e | 1529 | } |
33a2b854 | 1530 | |
f3ed775e | 1531 | /* |
54d01ffb | 1532 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1533 | */ |
54d01ffb | 1534 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1535 | { |
f40799e8 | 1536 | int ret = 0; |
8c0faa1d | 1537 | |
f3ed775e | 1538 | if (session->kconsumer_fds_sent == 0) { |
d9800920 | 1539 | /* |
54d01ffb DG |
1540 | * Assign default kernel consumer socket if no consumer assigned to the |
1541 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1542 | * an extra security check. | |
d9800920 DG |
1543 | */ |
1544 | if (session->consumer_fd == 0) { | |
1545 | session->consumer_fd = kconsumerd_cmd_sock; | |
1546 | } | |
1547 | ||
1548 | ret = send_kconsumerd_fds(session); | |
f3ed775e | 1549 | if (ret < 0) { |
f3ed775e DG |
1550 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1551 | goto error; | |
1552 | } | |
1d4b027a | 1553 | |
f3ed775e DG |
1554 | session->kconsumer_fds_sent = 1; |
1555 | } | |
1d4b027a DG |
1556 | |
1557 | error: | |
1558 | return ret; | |
8c0faa1d DG |
1559 | } |
1560 | ||
0177d773 DG |
1561 | /* |
1562 | * Create an UST session and add it to the session ust list. | |
1563 | */ | |
44d3bd01 DG |
1564 | static int create_ust_session(struct ltt_session *session, |
1565 | struct lttng_domain *domain) | |
0177d773 | 1566 | { |
44d3bd01 | 1567 | int ret; |
0177d773 | 1568 | struct ltt_ust_session *lus; |
44d3bd01 DG |
1569 | struct ltt_traceable_app *app; |
1570 | ||
1571 | switch (domain->type) { | |
1572 | case LTTNG_DOMAIN_UST_PID: | |
1573 | app = traceable_app_get_by_pid(domain->attr.pid); | |
1574 | if (app == NULL) { | |
1575 | ret = LTTCOMM_APP_NOT_FOUND; | |
1576 | goto error; | |
1577 | } | |
1578 | break; | |
1579 | default: | |
1580 | goto error; | |
1581 | } | |
0177d773 DG |
1582 | |
1583 | DBG("Creating UST session"); | |
1584 | ||
44d3bd01 | 1585 | lus = trace_ust_create_session(session->path, domain->attr.pid, domain); |
0177d773 | 1586 | if (lus == NULL) { |
44d3bd01 | 1587 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1588 | goto error; |
1589 | } | |
1590 | ||
1591 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1592 | geteuid(), allowed_group()); | |
1593 | if (ret < 0) { | |
1594 | if (ret != -EEXIST) { | |
1595 | ERR("Trace directory creation error"); | |
44d3bd01 | 1596 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1597 | goto error; |
1598 | } | |
1599 | } | |
1600 | ||
1601 | /* Create session on the UST tracer */ | |
44d3bd01 | 1602 | ret = ustctl_create_session(app->sock, lus); |
0177d773 | 1603 | if (ret < 0) { |
44d3bd01 | 1604 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1605 | goto error; |
1606 | } | |
1607 | ||
44d3bd01 DG |
1608 | cds_list_add(&lus->list, &session->ust_session_list.head); |
1609 | session->ust_session_list.count++; | |
1610 | ||
1611 | return LTTCOMM_OK; | |
0177d773 DG |
1612 | |
1613 | error: | |
1614 | free(lus); | |
1615 | return ret; | |
1616 | } | |
1617 | ||
333f285e | 1618 | /* |
d063d709 | 1619 | * Create a kernel tracer session then create the default channel. |
333f285e | 1620 | */ |
f3ed775e | 1621 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1622 | { |
f3ed775e | 1623 | int ret; |
f3ed775e DG |
1624 | |
1625 | DBG("Creating kernel session"); | |
1626 | ||
1627 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1628 | if (ret < 0) { | |
1629 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1630 | goto error; | |
333f285e DG |
1631 | } |
1632 | ||
d9800920 DG |
1633 | /* Set kernel consumer socket fd */ |
1634 | if (kconsumerd_cmd_sock) { | |
1635 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1636 | } | |
1637 | ||
63053e7c DG |
1638 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1639 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1640 | if (ret < 0) { |
996b65c8 | 1641 | if (ret != -EEXIST) { |
7a485870 DG |
1642 | ERR("Trace directory creation error"); |
1643 | goto error; | |
1644 | } | |
1645 | } | |
1646 | ||
f3ed775e DG |
1647 | error: |
1648 | return ret; | |
333f285e DG |
1649 | } |
1650 | ||
6c9cc2ab DG |
1651 | /* |
1652 | * Using the session list, filled a lttng_session array to send back to the | |
1653 | * client for session listing. | |
1654 | * | |
1655 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1656 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1657 | */ |
1658 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1659 | { | |
1660 | int i = 0; | |
1661 | struct ltt_session *session; | |
1662 | ||
1663 | DBG("Getting all available session"); | |
1664 | /* | |
1665 | * Iterate over session list and append data after the control struct in | |
1666 | * the buffer. | |
1667 | */ | |
1668 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1669 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1670 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1671 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1672 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1673 | i++; |
1674 | } | |
1675 | } | |
1676 | ||
9f19cc17 DG |
1677 | /* |
1678 | * Fill lttng_channel array of all channels. | |
1679 | */ | |
1680 | static void list_lttng_channels(struct ltt_session *session, | |
1681 | struct lttng_channel *channels) | |
1682 | { | |
1683 | int i = 0; | |
1684 | struct ltt_kernel_channel *kchan; | |
1685 | ||
1686 | DBG("Listing channels for session %s", session->name); | |
1687 | ||
1688 | /* Kernel channels */ | |
1689 | if (session->kernel_session != NULL) { | |
54d01ffb DG |
1690 | cds_list_for_each_entry(kchan, |
1691 | &session->kernel_session->channel_list.head, list) { | |
9f19cc17 DG |
1692 | /* Copy lttng_channel struct to array */ |
1693 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1694 | channels[i].enabled = kchan->enabled; | |
1695 | i++; | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | /* TODO: Missing UST listing */ | |
1700 | } | |
1701 | ||
1702 | /* | |
1703 | * Fill lttng_event array of all events in the channel. | |
1704 | */ | |
1705 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1706 | struct lttng_event *events) | |
1707 | { | |
1708 | /* | |
1709 | * TODO: This is ONLY kernel. Need UST support. | |
1710 | */ | |
1711 | int i = 0; | |
1712 | struct ltt_kernel_event *event; | |
1713 | ||
1714 | DBG("Listing events for channel %s", kchan->channel->name); | |
1715 | ||
1716 | /* Kernel channels */ | |
1717 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1718 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1719 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1720 | events[i].enabled = event->enabled; |
1721 | switch (event->event->instrumentation) { | |
1722 | case LTTNG_KERNEL_TRACEPOINT: | |
1723 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1724 | break; | |
1725 | case LTTNG_KERNEL_KPROBE: | |
1726 | case LTTNG_KERNEL_KRETPROBE: | |
1727 | events[i].type = LTTNG_EVENT_PROBE; | |
1728 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1729 | sizeof(struct lttng_kernel_kprobe)); | |
1730 | break; | |
1731 | case LTTNG_KERNEL_FUNCTION: | |
1732 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1733 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1734 | sizeof(struct lttng_kernel_function)); | |
1735 | break; | |
0133c199 MD |
1736 | case LTTNG_KERNEL_NOOP: |
1737 | events[i].type = LTTNG_EVENT_NOOP; | |
1738 | break; | |
a54bd42d MD |
1739 | case LTTNG_KERNEL_SYSCALL: |
1740 | events[i].type = LTTNG_EVENT_SYSCALL; | |
0133c199 | 1741 | break; |
9f19cc17 DG |
1742 | } |
1743 | i++; | |
1744 | } | |
1745 | } | |
1746 | ||
fac6795d | 1747 | /* |
54d01ffb | 1748 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 1749 | */ |
54d01ffb DG |
1750 | static int cmd_disable_channel(struct ltt_session *session, |
1751 | int domain, char *channel_name) | |
fac6795d | 1752 | { |
54d01ffb | 1753 | int ret; |
379473d2 | 1754 | |
54d01ffb DG |
1755 | switch (domain) { |
1756 | case LTTNG_DOMAIN_KERNEL: | |
1757 | ret = channel_kernel_disable(session->kernel_session, | |
1758 | channel_name); | |
1759 | if (ret != LTTCOMM_OK) { | |
333f285e DG |
1760 | goto error; |
1761 | } | |
54d01ffb DG |
1762 | |
1763 | kernel_wait_quiescent(kernel_tracer_fd); | |
d0254c7c | 1764 | break; |
44d3bd01 DG |
1765 | case LTTNG_DOMAIN_UST_PID: |
1766 | break; | |
d0254c7c | 1767 | default: |
44d3bd01 | 1768 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
54d01ffb | 1769 | goto error; |
20fe2104 DG |
1770 | } |
1771 | ||
54d01ffb | 1772 | ret = LTTCOMM_OK; |
d65106b1 | 1773 | |
54d01ffb DG |
1774 | error: |
1775 | return ret; | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
1780 | */ | |
44d3bd01 DG |
1781 | static int cmd_enable_channel(struct ltt_session *session, |
1782 | struct lttng_domain *domain, struct lttng_channel *attr) | |
54d01ffb DG |
1783 | { |
1784 | int ret; | |
d65106b1 | 1785 | |
44d3bd01 DG |
1786 | switch (domain->type) { |
1787 | case LTTNG_DOMAIN_KERNEL: | |
1788 | { | |
1789 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 1790 | |
44d3bd01 DG |
1791 | kchan = trace_kernel_get_channel_by_name(attr->name, |
1792 | session->kernel_session); | |
1793 | if (kchan == NULL) { | |
1794 | ret = channel_kernel_create(session->kernel_session, | |
1795 | attr, kernel_poll_pipe[1]); | |
1796 | } else { | |
1797 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
1798 | } | |
1799 | ||
1800 | if (ret != LTTCOMM_OK) { | |
1801 | goto error; | |
1802 | } | |
1803 | ||
1804 | kernel_wait_quiescent(kernel_tracer_fd); | |
1805 | break; | |
1806 | } | |
1807 | case LTTNG_DOMAIN_UST_PID: | |
1808 | { | |
1809 | struct ltt_ust_event *uevent, *new_uevent; | |
1810 | struct ltt_ust_session *usess; | |
1811 | struct ltt_ust_channel *uchan, *app_chan; | |
1812 | struct ltt_traceable_app *app; | |
1813 | ||
1814 | usess = trace_ust_get_session_by_pid(&session->ust_session_list, | |
1815 | domain->attr.pid); | |
1816 | if (usess == NULL) { | |
1817 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
1818 | goto error; | |
1819 | } | |
1820 | ||
1821 | app = traceable_app_get_by_pid(domain->attr.pid); | |
1822 | if (app == NULL) { | |
1823 | ret = LTTCOMM_APP_NOT_FOUND; | |
1824 | goto error; | |
1825 | } | |
1826 | ||
1827 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
1828 | if (uchan == NULL) { | |
1829 | ret = channel_ust_create(usess, attr, app->sock); | |
1830 | } else { | |
1831 | ret = channel_ust_enable(usess, uchan, app->sock); | |
1832 | } | |
1833 | ||
1834 | if (ret != LTTCOMM_OK) { | |
1835 | goto error; | |
1836 | } | |
1837 | ||
1838 | /*TODO: This should be put in an external function */ | |
1839 | ||
1840 | /* Copy UST channel to add to the traceable app */ | |
1841 | uchan = trace_ust_get_channel_by_name(attr->name, usess); | |
1842 | if (uchan == NULL) { | |
1843 | ret = LTTCOMM_FATAL; | |
1844 | goto error; | |
1845 | } | |
1846 | ||
1847 | app_chan = trace_ust_create_channel(attr, session->path); | |
1848 | if (app_chan == NULL) { | |
1849 | PERROR("malloc ltt_ust_channel"); | |
1850 | ret = LTTCOMM_FATAL; | |
1851 | goto error; | |
1852 | } | |
1853 | ||
1854 | memcpy(app_chan, uchan, sizeof(struct ltt_ust_channel)); | |
1855 | CDS_INIT_LIST_HEAD(&app_chan->events.head); | |
1856 | ||
1857 | cds_list_for_each_entry(uevent, &uchan->events.head, list) { | |
1858 | new_uevent = malloc(sizeof(struct ltt_ust_event)); | |
1859 | if (new_uevent == NULL) { | |
1860 | PERROR("malloc ltt_ust_event"); | |
1861 | ret = LTTCOMM_FATAL; | |
d65106b1 DG |
1862 | goto error; |
1863 | } | |
54d01ffb | 1864 | |
44d3bd01 DG |
1865 | memcpy(new_uevent, uevent, sizeof(struct ltt_ust_event)); |
1866 | cds_list_add(&new_uevent->list, &app_chan->events.head); | |
1867 | app_chan->events.count++; | |
1868 | } | |
1869 | ||
1870 | /* Add channel to traceable_app */ | |
1871 | cds_list_add(&app_chan->list, &app->channels.head); | |
1872 | app->channels.count++; | |
1873 | ||
1874 | DBG("UST channel %s created for app sock %d with pid %d", | |
1875 | attr->name, app->sock, domain->attr.pid); | |
1876 | break; | |
1877 | } | |
1878 | default: | |
1879 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
1880 | goto error; | |
54d01ffb DG |
1881 | } |
1882 | ||
1883 | ret = LTTCOMM_OK; | |
1884 | ||
1885 | error: | |
1886 | return ret; | |
1887 | } | |
1888 | ||
1889 | /* | |
1890 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
1891 | */ | |
1892 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
1893 | char *channel_name, char *event_name) | |
1894 | { | |
1895 | int ret; | |
1896 | struct ltt_kernel_channel *kchan; | |
1897 | ||
1898 | switch (domain) { | |
1899 | case LTTNG_DOMAIN_KERNEL: | |
1900 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1901 | session->kernel_session); | |
1902 | if (kchan == NULL) { | |
1903 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1904 | goto error; | |
d65106b1 DG |
1905 | } |
1906 | ||
54d01ffb DG |
1907 | ret = event_kernel_disable(session->kernel_session, kchan, event_name); |
1908 | if (ret != LTTCOMM_OK) { | |
1909 | goto error; | |
1910 | } | |
1911 | ||
1912 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 1913 | break; |
54d01ffb DG |
1914 | default: |
1915 | /* TODO: Userspace tracing */ | |
1916 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1917 | goto error; | |
d65106b1 | 1918 | } |
26cc6b4e | 1919 | |
54d01ffb DG |
1920 | ret = LTTCOMM_OK; |
1921 | ||
1922 | error: | |
1923 | return ret; | |
1924 | } | |
1925 | ||
1926 | /* | |
1927 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
1928 | */ | |
1929 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
1930 | char *channel_name) | |
1931 | { | |
1932 | int ret; | |
1933 | struct ltt_kernel_channel *kchan; | |
1934 | ||
1935 | switch (domain) { | |
1936 | case LTTNG_DOMAIN_KERNEL: | |
1937 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
1938 | session->kernel_session); | |
1939 | if (kchan == NULL) { | |
1940 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1941 | goto error; | |
26cc6b4e DG |
1942 | } |
1943 | ||
54d01ffb DG |
1944 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
1945 | if (ret != LTTCOMM_OK) { | |
0b97ec54 | 1946 | goto error; |
26cc6b4e DG |
1947 | } |
1948 | ||
54d01ffb | 1949 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 1950 | break; |
54d01ffb DG |
1951 | default: |
1952 | /* TODO: Userspace tracing */ | |
1953 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1954 | goto error; | |
26cc6b4e | 1955 | } |
e953ef25 | 1956 | |
54d01ffb | 1957 | ret = LTTCOMM_OK; |
e953ef25 | 1958 | |
54d01ffb DG |
1959 | error: |
1960 | return ret; | |
1961 | } | |
f5177a38 | 1962 | |
54d01ffb DG |
1963 | /* |
1964 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
1965 | */ | |
1966 | static int cmd_add_context(struct ltt_session *session, int domain, | |
1967 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
1968 | { | |
1969 | int ret; | |
f5177a38 | 1970 | |
54d01ffb DG |
1971 | switch (domain) { |
1972 | case LTTNG_DOMAIN_KERNEL: | |
1973 | /* Add kernel context to kernel tracer */ | |
1974 | ret = context_kernel_add(session->kernel_session, ctx, | |
1975 | event_name, channel_name); | |
1976 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 1977 | goto error; |
e953ef25 DG |
1978 | } |
1979 | ||
e953ef25 | 1980 | break; |
54d01ffb DG |
1981 | default: |
1982 | /* TODO: Userspace tracing */ | |
1983 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1984 | goto error; | |
e953ef25 | 1985 | } |
950131af | 1986 | |
54d01ffb | 1987 | ret = LTTCOMM_OK; |
950131af | 1988 | |
54d01ffb DG |
1989 | error: |
1990 | return ret; | |
1991 | } | |
1992 | ||
1993 | /* | |
1994 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
1995 | */ | |
1996 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
1997 | char *channel_name, struct lttng_event *event) | |
1998 | { | |
1999 | int ret; | |
2000 | struct ltt_kernel_channel *kchan; | |
2001 | ||
2002 | switch (domain) { | |
2003 | case LTTNG_DOMAIN_KERNEL: | |
2004 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2005 | session->kernel_session); | |
2006 | if (kchan == NULL) { | |
2007 | /* This call will notify the kernel thread */ | |
44d3bd01 | 2008 | ret = channel_kernel_create(session->kernel_session, |
54d01ffb DG |
2009 | NULL, kernel_poll_pipe[1]); |
2010 | if (ret != LTTCOMM_OK) { | |
f5177a38 DG |
2011 | goto error; |
2012 | } | |
54d01ffb | 2013 | } |
950131af | 2014 | |
54d01ffb DG |
2015 | /* Get the newly created kernel channel pointer */ |
2016 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2017 | session->kernel_session); | |
2018 | if (kchan == NULL) { | |
2019 | /* This sould not happen... */ | |
2020 | ret = LTTCOMM_FATAL; | |
2021 | goto error; | |
2022 | } | |
f5177a38 | 2023 | |
54d01ffb DG |
2024 | ret = event_kernel_enable(session->kernel_session, kchan, event); |
2025 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2026 | goto error; |
950131af DG |
2027 | } |
2028 | ||
54d01ffb | 2029 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2030 | break; |
54d01ffb DG |
2031 | default: |
2032 | /* TODO: Userspace tracing */ | |
2033 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2034 | goto error; | |
950131af | 2035 | } |
d36b8583 | 2036 | |
54d01ffb | 2037 | ret = LTTCOMM_OK; |
d36b8583 | 2038 | |
54d01ffb DG |
2039 | error: |
2040 | return ret; | |
2041 | } | |
7d29a247 | 2042 | |
54d01ffb DG |
2043 | /* |
2044 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2045 | */ | |
2046 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2047 | char *channel_name, int event_type) |
54d01ffb DG |
2048 | { |
2049 | int ret; | |
2050 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2051 | |
54d01ffb DG |
2052 | switch (domain) { |
2053 | case LTTNG_DOMAIN_KERNEL: | |
2054 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2055 | session->kernel_session); | |
2056 | if (kchan == NULL) { | |
2057 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2058 | ret = channel_kernel_create(session->kernel_session, NULL, |
2059 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2060 | if (ret != LTTCOMM_OK) { |
2061 | goto error; | |
d36b8583 | 2062 | } |
54d01ffb | 2063 | } |
0d0c377a | 2064 | |
54d01ffb DG |
2065 | /* Get the newly created kernel channel pointer */ |
2066 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2067 | session->kernel_session); | |
2068 | if (kchan == NULL) { | |
2069 | /* This sould not happen... */ | |
2070 | ret = LTTCOMM_FATAL; | |
2071 | goto error; | |
2072 | } | |
0fdd1e2c | 2073 | |
8c9ae521 DG |
2074 | if (event_type == LTTNG_KERNEL_SYSCALL) { |
2075 | ret = event_kernel_enable_syscalls(session->kernel_session, | |
2076 | kchan, kernel_tracer_fd); | |
2077 | } else { | |
2078 | /* | |
2079 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and events | |
2080 | * already registered to the channel. | |
2081 | */ | |
2082 | ret = event_kernel_enable_all(session->kernel_session, | |
2083 | kchan, kernel_tracer_fd); | |
2084 | } | |
2085 | ||
54d01ffb | 2086 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2087 | goto error; |
d36b8583 DG |
2088 | } |
2089 | ||
54d01ffb | 2090 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2091 | break; |
54d01ffb DG |
2092 | default: |
2093 | /* TODO: Userspace tracing */ | |
2094 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2095 | goto error; | |
d36b8583 | 2096 | } |
f3ed775e | 2097 | |
54d01ffb DG |
2098 | ret = LTTCOMM_OK; |
2099 | ||
2100 | error: | |
2101 | return ret; | |
2102 | } | |
2103 | ||
2104 | /* | |
2105 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2106 | */ | |
2107 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2108 | { | |
2109 | int ret; | |
2110 | ssize_t nb_events = 0; | |
2111 | ||
2112 | switch (domain) { | |
2113 | case LTTNG_DOMAIN_KERNEL: | |
2114 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2115 | if (nb_events < 0) { | |
2116 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2117 | goto error; | |
894be886 | 2118 | } |
54d01ffb DG |
2119 | break; |
2120 | default: | |
2121 | /* TODO: Userspace listing */ | |
2122 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2123 | goto error; | |
2124 | } | |
894be886 | 2125 | |
54d01ffb | 2126 | return nb_events; |
7d29a247 | 2127 | |
54d01ffb DG |
2128 | error: |
2129 | /* Return negative value to differentiate return code */ | |
2130 | return -ret; | |
2131 | } | |
b389abbe | 2132 | |
54d01ffb DG |
2133 | /* |
2134 | * Command LTTNG_START_TRACE processed by the client thread. | |
2135 | */ | |
2136 | static int cmd_start_trace(struct ltt_session *session) | |
2137 | { | |
2138 | int ret; | |
2139 | struct ltt_kernel_channel *kchan; | |
2140 | struct ltt_kernel_session *ksession; | |
b389abbe | 2141 | |
54d01ffb DG |
2142 | /* Short cut */ |
2143 | ksession = session->kernel_session; | |
5eb91c98 | 2144 | |
54d01ffb DG |
2145 | /* Kernel tracing */ |
2146 | if (ksession != NULL) { | |
2147 | /* Open kernel metadata */ | |
2148 | if (ksession->metadata == NULL) { | |
2149 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2150 | if (ret < 0) { | |
2151 | ret = LTTCOMM_KERN_META_FAIL; | |
2152 | goto error; | |
b389abbe | 2153 | } |
54d01ffb | 2154 | } |
7d29a247 | 2155 | |
54d01ffb DG |
2156 | /* Open kernel metadata stream */ |
2157 | if (ksession->metadata_stream_fd == 0) { | |
2158 | ret = kernel_open_metadata_stream(ksession); | |
2159 | if (ret < 0) { | |
2160 | ERR("Kernel create metadata stream failed"); | |
2161 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2162 | goto error; | |
2163 | } | |
2164 | } | |
2165 | ||
2166 | /* For each channel */ | |
2167 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2168 | if (kchan->stream_count == 0) { | |
2169 | ret = kernel_open_channel_stream(kchan); | |
2170 | if (ret < 0) { | |
2171 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2172 | goto error; |
2173 | } | |
54d01ffb DG |
2174 | /* Update the stream global counter */ |
2175 | ksession->stream_count_global += ret; | |
7d29a247 | 2176 | } |
54d01ffb DG |
2177 | } |
2178 | ||
2179 | /* Setup kernel consumer socket and send fds to it */ | |
2180 | ret = init_kernel_tracing(ksession); | |
2181 | if (ret < 0) { | |
2182 | ret = LTTCOMM_KERN_START_FAIL; | |
2183 | goto error; | |
2184 | } | |
2185 | ||
2186 | /* This start the kernel tracing */ | |
2187 | ret = kernel_start_session(ksession); | |
2188 | if (ret < 0) { | |
2189 | ret = LTTCOMM_KERN_START_FAIL; | |
2190 | goto error; | |
2191 | } | |
2192 | ||
2193 | /* Quiescent wait after starting trace */ | |
2194 | kernel_wait_quiescent(kernel_tracer_fd); | |
2195 | } | |
2196 | ||
2197 | /* TODO: Start all UST traces */ | |
2198 | ||
2199 | ret = LTTCOMM_OK; | |
2200 | ||
2201 | error: | |
2202 | return ret; | |
2203 | } | |
2204 | ||
2205 | /* | |
2206 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2207 | */ | |
2208 | static int cmd_stop_trace(struct ltt_session *session) | |
2209 | { | |
2210 | int ret; | |
2211 | struct ltt_kernel_channel *kchan; | |
2212 | struct ltt_kernel_session *ksession; | |
2213 | ||
2214 | /* Short cut */ | |
2215 | ksession = session->kernel_session; | |
2216 | ||
2217 | /* Kernel tracer */ | |
2218 | if (ksession != NULL) { | |
2219 | DBG("Stop kernel tracing"); | |
2220 | ||
2221 | /* Flush all buffers before stopping */ | |
2222 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2223 | if (ret < 0) { | |
2224 | ERR("Kernel metadata flush failed"); | |
2225 | } | |
f34daff7 | 2226 | |
54d01ffb DG |
2227 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2228 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2229 | if (ret < 0) { |
54d01ffb | 2230 | ERR("Kernel flush buffer error"); |
7d29a247 | 2231 | } |
54d01ffb | 2232 | } |
19e70852 | 2233 | |
54d01ffb DG |
2234 | ret = kernel_stop_session(ksession); |
2235 | if (ret < 0) { | |
2236 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2237 | goto error; |
f3ed775e | 2238 | } |
54d01ffb DG |
2239 | |
2240 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2241 | } |
54d01ffb DG |
2242 | |
2243 | /* TODO : User-space tracer */ | |
2244 | ||
2245 | ret = LTTCOMM_OK; | |
2246 | ||
2247 | error: | |
2248 | return ret; | |
2249 | } | |
2250 | ||
2251 | /* | |
2252 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2253 | */ | |
2254 | static int cmd_create_session(char *name, char *path) | |
2255 | { | |
2256 | int ret; | |
2257 | ||
2258 | ret = session_create(name, path); | |
2259 | if (ret != LTTCOMM_OK) { | |
2260 | goto error; | |
2261 | } | |
2262 | ||
2263 | ret = LTTCOMM_OK; | |
2264 | ||
2265 | error: | |
2266 | return ret; | |
2267 | } | |
2268 | ||
2269 | /* | |
2270 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2271 | */ | |
2272 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2273 | { | |
2274 | int ret; | |
2275 | ||
2276 | /* Clean kernel session teardown */ | |
2277 | teardown_kernel_session(session); | |
2278 | ||
2279 | /* | |
2280 | * Must notify the kernel thread here to update it's poll setin order | |
2281 | * to remove the channel(s)' fd just destroyed. | |
2282 | */ | |
2283 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2284 | if (ret < 0) { | |
2285 | perror("write kernel poll pipe"); | |
2286 | } | |
2287 | ||
2288 | ret = session_destroy(name); | |
2289 | ||
2290 | return ret; | |
2291 | } | |
2292 | ||
2293 | /* | |
2294 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2295 | */ | |
2296 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2297 | { | |
2298 | int ret; | |
2299 | ||
2300 | switch (domain) { | |
2301 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2302 | { |
54d01ffb | 2303 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2304 | |
54d01ffb DG |
2305 | kcalibrate.type = calibrate->type; |
2306 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2307 | if (ret < 0) { |
54d01ffb DG |
2308 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2309 | goto error; | |
33a2b854 | 2310 | } |
54d01ffb DG |
2311 | break; |
2312 | } | |
2313 | default: | |
2314 | /* TODO: Userspace tracing */ | |
2315 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2316 | goto error; | |
2317 | } | |
33a2b854 | 2318 | |
54d01ffb | 2319 | ret = LTTCOMM_OK; |
33a2b854 | 2320 | |
54d01ffb DG |
2321 | error: |
2322 | return ret; | |
2323 | } | |
7d29a247 | 2324 | |
54d01ffb DG |
2325 | /* |
2326 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
2327 | */ | |
2328 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
2329 | char *sock_path) | |
2330 | { | |
2331 | int ret, sock; | |
b389abbe | 2332 | |
54d01ffb DG |
2333 | switch (domain) { |
2334 | case LTTNG_DOMAIN_KERNEL: | |
2335 | /* Can't register a consumer if there is already one */ | |
2336 | if (session->kernel_session->consumer_fd != 0) { | |
2337 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
2338 | goto error; | |
2339 | } | |
2340 | ||
2341 | sock = lttcomm_connect_unix_sock(sock_path); | |
2342 | if (sock < 0) { | |
2343 | ret = LTTCOMM_CONNECT_FAIL; | |
2344 | goto error; | |
2345 | } | |
2346 | ||
2347 | session->kernel_session->consumer_fd = sock; | |
2348 | break; | |
2349 | default: | |
2350 | /* TODO: Userspace tracing */ | |
2351 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2352 | goto error; | |
2353 | } | |
2354 | ||
2355 | ret = LTTCOMM_OK; | |
2356 | ||
2357 | error: | |
2358 | return ret; | |
2359 | } | |
2360 | ||
2361 | /* | |
2362 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
2363 | */ | |
2364 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
2365 | struct lttng_domain **domains) | |
2366 | { | |
2367 | int ret; | |
2368 | ssize_t nb_dom = 0; | |
2369 | ||
2370 | if (session->kernel_session != NULL) { | |
2371 | nb_dom++; | |
2372 | } | |
2373 | ||
2374 | nb_dom += session->ust_session_list.count; | |
2375 | ||
2376 | *domains = malloc(nb_dom * sizeof(struct lttng_domain)); | |
2377 | if (*domains == NULL) { | |
2378 | ret = -LTTCOMM_FATAL; | |
2379 | goto error; | |
2380 | } | |
2381 | ||
2382 | (*domains)[0].type = LTTNG_DOMAIN_KERNEL; | |
2383 | ||
2384 | /* TODO: User-space tracer domain support */ | |
2385 | ||
2386 | return nb_dom; | |
2387 | ||
2388 | error: | |
2389 | return ret; | |
2390 | } | |
2391 | ||
2392 | /* | |
2393 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
2394 | */ | |
2395 | static ssize_t cmd_list_channels(struct ltt_session *session, | |
2396 | struct lttng_channel **channels) | |
2397 | { | |
2398 | int ret; | |
2399 | ssize_t nb_chan = 0; | |
2400 | ||
2401 | if (session->kernel_session != NULL) { | |
2402 | nb_chan += session->kernel_session->channel_count; | |
2403 | } | |
2404 | ||
2405 | *channels = malloc(nb_chan * sizeof(struct lttng_channel)); | |
2406 | if (*channels == NULL) { | |
2407 | ret = -LTTCOMM_FATAL; | |
2408 | goto error; | |
2409 | } | |
2410 | ||
2411 | list_lttng_channels(session, *channels); | |
2412 | ||
2413 | return nb_chan; | |
2414 | ||
2415 | error: | |
2416 | return ret; | |
2417 | } | |
2418 | ||
2419 | /* | |
2420 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
2421 | */ | |
2422 | static ssize_t cmd_list_events(struct ltt_session *session, | |
2423 | char *channel_name, struct lttng_event **events) | |
2424 | { | |
2425 | int ret; | |
2426 | ssize_t nb_event = 0; | |
2427 | struct ltt_kernel_channel *kchan = NULL; | |
2428 | ||
2429 | if (session->kernel_session != NULL) { | |
2430 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2431 | session->kernel_session); | |
2432 | if (kchan == NULL) { | |
2433 | ret = -LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2434 | goto error; | |
2435 | } | |
2436 | nb_event += kchan->event_count; | |
2437 | } | |
2438 | ||
2439 | *events = malloc(nb_event * sizeof(struct lttng_event)); | |
2440 | if (*events == NULL) { | |
2441 | ret = -LTTCOMM_FATAL; | |
2442 | goto error; | |
2443 | } | |
2444 | ||
2445 | list_lttng_events(kchan, *events); | |
2446 | ||
2447 | /* TODO: User-space tracer support */ | |
2448 | ||
2449 | return nb_event; | |
2450 | ||
2451 | error: | |
2452 | return ret; | |
2453 | } | |
2454 | ||
2455 | /* | |
2456 | * Process the command requested by the lttng client within the command | |
2457 | * context structure. This function make sure that the return structure (llm) | |
2458 | * is set and ready for transmission before returning. | |
2459 | * | |
2460 | * Return any error encountered or 0 for success. | |
2461 | */ | |
2462 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
2463 | { | |
2464 | int ret = LTTCOMM_OK; | |
44d3bd01 | 2465 | int need_tracing_session = 1; |
54d01ffb DG |
2466 | |
2467 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2468 | ||
2469 | /* | |
2470 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2471 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2472 | * command. |
2473 | */ | |
2474 | switch(cmd_ctx->lsm->cmd_type) { | |
2475 | case LTTNG_LIST_SESSIONS: | |
2476 | case LTTNG_LIST_TRACEPOINTS: | |
2477 | case LTTNG_LIST_DOMAINS: | |
2478 | case LTTNG_LIST_CHANNELS: | |
2479 | case LTTNG_LIST_EVENTS: | |
2480 | break; | |
2481 | default: | |
2482 | /* Setup lttng message with no payload */ | |
2483 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2484 | if (ret < 0) { | |
2485 | /* This label does not try to unlock the session */ | |
2486 | goto init_setup_error; | |
2487 | } | |
2488 | } | |
2489 | ||
2490 | /* Commands that DO NOT need a session. */ | |
2491 | switch (cmd_ctx->lsm->cmd_type) { | |
2492 | case LTTNG_CALIBRATE: | |
2493 | case LTTNG_CREATE_SESSION: | |
2494 | case LTTNG_LIST_SESSIONS: | |
2495 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 2496 | need_tracing_session = 0; |
54d01ffb DG |
2497 | break; |
2498 | default: | |
2499 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
2500 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); | |
2501 | if (cmd_ctx->session == NULL) { | |
2502 | if (cmd_ctx->lsm->session.name != NULL) { | |
2503 | ret = LTTCOMM_SESS_NOT_FOUND; | |
2504 | } else { | |
2505 | /* If no session name specified */ | |
2506 | ret = LTTCOMM_SELECT_SESS; | |
2507 | } | |
2508 | goto error; | |
2509 | } else { | |
2510 | /* Acquire lock for the session */ | |
2511 | session_lock(cmd_ctx->session); | |
2512 | } | |
2513 | break; | |
2514 | } | |
b389abbe | 2515 | |
54d01ffb DG |
2516 | /* |
2517 | * Check domain type for specific "pre-action". | |
2518 | */ | |
2519 | switch (cmd_ctx->lsm->domain.type) { | |
2520 | case LTTNG_DOMAIN_KERNEL: | |
2521 | /* Kernel tracer check */ | |
2522 | if (kernel_tracer_fd == 0) { | |
2523 | /* Basically, load kernel tracer modules */ | |
2524 | init_kernel_tracer(); | |
2525 | if (kernel_tracer_fd == 0) { | |
2526 | ret = LTTCOMM_KERN_NA; | |
2527 | goto error; | |
2528 | } | |
2529 | } | |
5eb91c98 | 2530 | |
54d01ffb | 2531 | /* Need a session for kernel command */ |
44d3bd01 | 2532 | if (need_tracing_session) { |
54d01ffb DG |
2533 | if (cmd_ctx->session->kernel_session == NULL) { |
2534 | ret = create_kernel_session(cmd_ctx->session); | |
5eb91c98 | 2535 | if (ret < 0) { |
54d01ffb | 2536 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
2537 | goto error; |
2538 | } | |
b389abbe | 2539 | } |
7d29a247 | 2540 | |
54d01ffb DG |
2541 | /* Start the kernel consumer daemon */ |
2542 | if (kconsumerd_pid == 0 && | |
2543 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
2544 | ret = start_kconsumerd(); | |
7d29a247 | 2545 | if (ret < 0) { |
54d01ffb DG |
2546 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
2547 | goto error; | |
950131af | 2548 | } |
33a2b854 | 2549 | } |
0d0c377a | 2550 | } |
54d01ffb | 2551 | break; |
44d3bd01 DG |
2552 | case LTTNG_DOMAIN_UST_PID: |
2553 | { | |
2554 | struct ltt_ust_session *usess; | |
2555 | ||
2556 | if (need_tracing_session) { | |
2557 | usess = trace_ust_get_session_by_pid( | |
2558 | &cmd_ctx->session->ust_session_list, | |
2559 | cmd_ctx->lsm->domain.attr.pid); | |
2560 | if (usess == NULL) { | |
2561 | ret = create_ust_session(cmd_ctx->session, | |
2562 | &cmd_ctx->lsm->domain); | |
2563 | if (ret != LTTCOMM_OK) { | |
2564 | goto error; | |
2565 | } | |
2566 | } | |
2567 | } | |
2568 | break; | |
2569 | } | |
54d01ffb DG |
2570 | default: |
2571 | /* TODO Userspace tracer */ | |
2572 | break; | |
2573 | } | |
33a2b854 | 2574 | |
54d01ffb DG |
2575 | /* Process by command type */ |
2576 | switch (cmd_ctx->lsm->cmd_type) { | |
2577 | case LTTNG_ADD_CONTEXT: | |
2578 | { | |
2579 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2580 | cmd_ctx->lsm->u.context.channel_name, | |
2581 | cmd_ctx->lsm->u.context.event_name, | |
2582 | &cmd_ctx->lsm->u.context.ctx); | |
2583 | break; | |
2584 | } | |
2585 | case LTTNG_DISABLE_CHANNEL: | |
2586 | { | |
2587 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2588 | cmd_ctx->lsm->u.disable.channel_name); | |
2589 | break; | |
2590 | } | |
2591 | case LTTNG_DISABLE_EVENT: | |
2592 | { | |
2593 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2594 | cmd_ctx->lsm->u.disable.channel_name, | |
2595 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2596 | ret = LTTCOMM_OK; |
2597 | break; | |
2598 | } | |
54d01ffb DG |
2599 | case LTTNG_DISABLE_ALL_EVENT: |
2600 | { | |
2601 | DBG("Disabling all kernel event"); | |
2602 | ||
2603 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2604 | cmd_ctx->lsm->u.disable.channel_name); | |
2605 | break; | |
2606 | } | |
2607 | case LTTNG_ENABLE_CHANNEL: | |
2608 | { | |
44d3bd01 | 2609 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb DG |
2610 | &cmd_ctx->lsm->u.channel.chan); |
2611 | break; | |
2612 | } | |
2613 | case LTTNG_ENABLE_EVENT: | |
2614 | { | |
2615 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2616 | cmd_ctx->lsm->u.enable.channel_name, | |
2617 | &cmd_ctx->lsm->u.enable.event); | |
2618 | break; | |
2619 | } | |
2620 | case LTTNG_ENABLE_ALL_EVENT: | |
2621 | { | |
2622 | DBG("Enabling all kernel event"); | |
2623 | ||
2624 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
2625 | cmd_ctx->lsm->u.enable.channel_name, |
2626 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
2627 | break; |
2628 | } | |
052da939 | 2629 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2630 | { |
9f19cc17 | 2631 | struct lttng_event *events; |
54d01ffb | 2632 | ssize_t nb_events; |
052da939 | 2633 | |
54d01ffb DG |
2634 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2635 | if (nb_events < 0) { | |
2636 | ret = -nb_events; | |
2637 | goto error; | |
2ef84c95 DG |
2638 | } |
2639 | ||
2640 | /* | |
2641 | * Setup lttng message with payload size set to the event list size in | |
2642 | * bytes and then copy list into the llm payload. | |
2643 | */ | |
052da939 | 2644 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2645 | if (ret < 0) { |
052da939 | 2646 | free(events); |
2ef84c95 DG |
2647 | goto setup_error; |
2648 | } | |
2649 | ||
2650 | /* Copy event list into message payload */ | |
9f19cc17 | 2651 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2652 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2653 | |
9f19cc17 | 2654 | free(events); |
2ef84c95 DG |
2655 | |
2656 | ret = LTTCOMM_OK; | |
2657 | break; | |
2658 | } | |
f3ed775e | 2659 | case LTTNG_START_TRACE: |
8c0faa1d | 2660 | { |
54d01ffb | 2661 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2662 | break; |
2663 | } | |
f3ed775e | 2664 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2665 | { |
54d01ffb | 2666 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2667 | break; |
2668 | } | |
5e16da05 MD |
2669 | case LTTNG_CREATE_SESSION: |
2670 | { | |
54d01ffb DG |
2671 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
2672 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
2673 | break; |
2674 | } | |
2675 | case LTTNG_DESTROY_SESSION: | |
2676 | { | |
54d01ffb DG |
2677 | ret = cmd_destroy_session(cmd_ctx->session, |
2678 | cmd_ctx->lsm->session.name); | |
5461b305 | 2679 | break; |
5e16da05 | 2680 | } |
9f19cc17 | 2681 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2682 | { |
54d01ffb DG |
2683 | ssize_t nb_dom; |
2684 | struct lttng_domain *domains; | |
5461b305 | 2685 | |
54d01ffb DG |
2686 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2687 | if (nb_dom < 0) { | |
2688 | ret = -nb_dom; | |
2689 | goto error; | |
ce3d728c | 2690 | } |
520ff687 | 2691 | |
54d01ffb | 2692 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2693 | if (ret < 0) { |
2694 | goto setup_error; | |
520ff687 | 2695 | } |
57167058 | 2696 | |
54d01ffb DG |
2697 | /* Copy event list into message payload */ |
2698 | memcpy(cmd_ctx->llm->payload, domains, | |
2699 | nb_dom * sizeof(struct lttng_domain)); | |
2700 | ||
2701 | free(domains); | |
5e16da05 | 2702 | |
5461b305 | 2703 | ret = LTTCOMM_OK; |
5e16da05 MD |
2704 | break; |
2705 | } | |
9f19cc17 | 2706 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2707 | { |
54d01ffb DG |
2708 | size_t nb_chan; |
2709 | struct lttng_channel *channels; | |
2710 | ||
2711 | nb_chan = cmd_list_channels(cmd_ctx->session, &channels); | |
2712 | if (nb_chan < 0) { | |
2713 | ret = -nb_chan; | |
2714 | goto error; | |
5461b305 | 2715 | } |
ca95a216 | 2716 | |
54d01ffb | 2717 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2718 | if (ret < 0) { |
2719 | goto setup_error; | |
2720 | } | |
9f19cc17 | 2721 | |
54d01ffb DG |
2722 | /* Copy event list into message payload */ |
2723 | memcpy(cmd_ctx->llm->payload, channels, | |
2724 | nb_chan * sizeof(struct lttng_channel)); | |
2725 | ||
2726 | free(channels); | |
9f19cc17 DG |
2727 | |
2728 | ret = LTTCOMM_OK; | |
5461b305 | 2729 | break; |
5e16da05 | 2730 | } |
9f19cc17 | 2731 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2732 | { |
54d01ffb | 2733 | size_t nb_event; |
684d34d2 | 2734 | struct lttng_event *events = NULL; |
9f19cc17 | 2735 | |
54d01ffb DG |
2736 | nb_event = cmd_list_events(cmd_ctx->session, |
2737 | cmd_ctx->lsm->u.list.channel_name, &events); | |
2738 | if (nb_event < 0) { | |
2739 | ret = -nb_event; | |
2740 | goto error; | |
5461b305 | 2741 | } |
ca95a216 | 2742 | |
54d01ffb | 2743 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2744 | if (ret < 0) { |
2745 | goto setup_error; | |
2746 | } | |
9f19cc17 | 2747 | |
54d01ffb DG |
2748 | /* Copy event list into message payload */ |
2749 | memcpy(cmd_ctx->llm->payload, events, | |
2750 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2751 | |
54d01ffb | 2752 | free(events); |
9f19cc17 DG |
2753 | |
2754 | ret = LTTCOMM_OK; | |
5461b305 | 2755 | break; |
5e16da05 MD |
2756 | } |
2757 | case LTTNG_LIST_SESSIONS: | |
2758 | { | |
54d01ffb | 2759 | session_lock_list(); |
5461b305 | 2760 | |
6c9cc2ab | 2761 | if (session_list_ptr->count == 0) { |
f3ed775e | 2762 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 2763 | session_unlock_list(); |
5461b305 | 2764 | goto error; |
57167058 | 2765 | } |
5e16da05 | 2766 | |
6c9cc2ab DG |
2767 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2768 | session_list_ptr->count); | |
5461b305 | 2769 | if (ret < 0) { |
54d01ffb | 2770 | session_unlock_list(); |
5461b305 | 2771 | goto setup_error; |
e065084a | 2772 | } |
5e16da05 | 2773 | |
6c9cc2ab DG |
2774 | /* Filled the session array */ |
2775 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2776 | ||
54d01ffb | 2777 | session_unlock_list(); |
5e16da05 | 2778 | |
5461b305 | 2779 | ret = LTTCOMM_OK; |
5e16da05 MD |
2780 | break; |
2781 | } | |
d0254c7c MD |
2782 | case LTTNG_CALIBRATE: |
2783 | { | |
54d01ffb DG |
2784 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2785 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2786 | break; |
2787 | } | |
d9800920 DG |
2788 | case LTTNG_REGISTER_CONSUMER: |
2789 | { | |
54d01ffb DG |
2790 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2791 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
2792 | break; |
2793 | } | |
5e16da05 | 2794 | default: |
5e16da05 | 2795 | ret = LTTCOMM_UND; |
5461b305 | 2796 | break; |
fac6795d DG |
2797 | } |
2798 | ||
5461b305 | 2799 | error: |
5461b305 DG |
2800 | if (cmd_ctx->llm == NULL) { |
2801 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2802 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2803 | goto setup_error; |
2804 | } | |
2805 | } | |
54d01ffb | 2806 | /* Set return code */ |
5461b305 | 2807 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2808 | setup_error: |
b5541356 | 2809 | if (cmd_ctx->session) { |
54d01ffb | 2810 | session_unlock(cmd_ctx->session); |
b5541356 | 2811 | } |
54d01ffb | 2812 | init_setup_error: |
8028d920 | 2813 | return ret; |
fac6795d DG |
2814 | } |
2815 | ||
1d4b027a | 2816 | /* |
d063d709 DG |
2817 | * This thread manage all clients request using the unix client socket for |
2818 | * communication. | |
1d4b027a DG |
2819 | */ |
2820 | static void *thread_manage_clients(void *data) | |
2821 | { | |
5eb91c98 DG |
2822 | int sock = 0, ret, i, pollfd; |
2823 | uint32_t revents, nb_fd; | |
273ea72c | 2824 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 2825 | struct lttng_poll_event events; |
1d4b027a DG |
2826 | |
2827 | DBG("[thread] Manage client started"); | |
2828 | ||
2829 | ret = lttcomm_listen_unix_sock(client_sock); | |
2830 | if (ret < 0) { | |
2831 | goto error; | |
2832 | } | |
2833 | ||
5eb91c98 DG |
2834 | /* |
2835 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2836 | * more will be added to this poll set. | |
2837 | */ | |
2838 | ret = create_thread_poll_set(&events, 2); | |
2839 | if (ret < 0) { | |
2840 | goto error; | |
2841 | } | |
273ea72c | 2842 | |
5eb91c98 DG |
2843 | /* Add the application registration socket */ |
2844 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2845 | if (ret < 0) { | |
2846 | goto error; | |
2847 | } | |
273ea72c | 2848 | |
bbd973c2 DG |
2849 | /* |
2850 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
2851 | */ |
2852 | if (opt_sig_parent) { | |
2853 | kill(ppid, SIGCHLD); | |
2854 | } | |
2855 | ||
2856 | while (1) { | |
1d4b027a | 2857 | DBG("Accepting client command ..."); |
273ea72c | 2858 | |
5eb91c98 DG |
2859 | nb_fd = LTTNG_POLL_GETNB(&events); |
2860 | ||
273ea72c | 2861 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 2862 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 2863 | if (ret < 0) { |
273ea72c DG |
2864 | goto error; |
2865 | } | |
2866 | ||
5eb91c98 DG |
2867 | for (i = 0; i < nb_fd; i++) { |
2868 | /* Fetch once the poll data */ | |
2869 | revents = LTTNG_POLL_GETEV(&events, i); | |
2870 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2871 | ||
2872 | /* Thread quit pipe has been closed. Killing thread. */ | |
2873 | ret = check_thread_quit_pipe(pollfd, revents); | |
2874 | if (ret) { | |
2875 | goto error; | |
2876 | } | |
2877 | ||
2878 | /* Event on the registration socket */ | |
2879 | if (pollfd == client_sock) { | |
2880 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2881 | ERR("Client socket poll error"); | |
2882 | goto error; | |
2883 | } | |
2884 | } | |
2885 | } | |
2886 | ||
2887 | DBG("Wait for client response"); | |
2888 | ||
2889 | sock = lttcomm_accept_unix_sock(client_sock); | |
2890 | if (sock < 0) { | |
273ea72c | 2891 | goto error; |
273ea72c DG |
2892 | } |
2893 | ||
5eb91c98 DG |
2894 | /* Allocate context command to process the client request */ |
2895 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2896 | if (cmd_ctx == NULL) { | |
2897 | perror("malloc cmd_ctx"); | |
1d4b027a | 2898 | goto error; |
5eb91c98 | 2899 | } |
1d4b027a | 2900 | |
5eb91c98 DG |
2901 | /* Allocate data buffer for reception */ |
2902 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2903 | if (cmd_ctx->lsm == NULL) { | |
2904 | perror("malloc cmd_ctx->lsm"); | |
2905 | goto error; | |
2906 | } | |
1d4b027a | 2907 | |
5eb91c98 DG |
2908 | cmd_ctx->llm = NULL; |
2909 | cmd_ctx->session = NULL; | |
1d4b027a | 2910 | |
5eb91c98 DG |
2911 | /* |
2912 | * Data is received from the lttng client. The struct | |
2913 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2914 | * the client. | |
2915 | */ | |
2916 | DBG("Receiving data from client ..."); | |
2917 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, | |
2918 | sizeof(struct lttcomm_session_msg)); | |
2919 | if (ret <= 0) { | |
2920 | DBG("Nothing recv() from client... continuing"); | |
2921 | close(sock); | |
2922 | free(cmd_ctx); | |
2923 | continue; | |
2924 | } | |
1d4b027a | 2925 | |
5eb91c98 DG |
2926 | // TODO: Validate cmd_ctx including sanity check for |
2927 | // security purpose. | |
f7776ea7 | 2928 | |
5eb91c98 DG |
2929 | /* |
2930 | * This function dispatch the work to the kernel or userspace tracer | |
2931 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2932 | * informations for the client. The command context struct contains | |
2933 | * everything this function may needs. | |
2934 | */ | |
2935 | ret = process_client_msg(cmd_ctx); | |
2936 | if (ret < 0) { | |
bbd973c2 | 2937 | /* |
5eb91c98 DG |
2938 | * TODO: Inform client somehow of the fatal error. At |
2939 | * this point, ret < 0 means that a malloc failed | |
2940 | * (ENOMEM). Error detected but still accept command. | |
bbd973c2 | 2941 | */ |
bbd973c2 | 2942 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
2943 | continue; |
2944 | } | |
d6e4fca4 | 2945 | |
54d01ffb DG |
2946 | DBG("Sending response (size: %d, retcode: %s)", |
2947 | cmd_ctx->lttng_msg_size, | |
532d79a7 | 2948 | lttng_get_readable_code(-cmd_ctx->llm->ret_code)); |
54d01ffb | 2949 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
2950 | if (ret < 0) { |
2951 | ERR("Failed to send data back to client"); | |
bbd973c2 | 2952 | } |
1d4b027a | 2953 | |
5eb91c98 DG |
2954 | clean_command_ctx(&cmd_ctx); |
2955 | ||
2956 | /* End of transmission */ | |
273ea72c DG |
2957 | close(sock); |
2958 | } | |
2959 | ||
5eb91c98 DG |
2960 | error: |
2961 | DBG("Client thread dying"); | |
273ea72c | 2962 | unlink(client_unix_sock_path); |
5eb91c98 DG |
2963 | close(client_sock); |
2964 | close(sock); | |
273ea72c | 2965 | |
5eb91c98 | 2966 | lttng_poll_clean(&events); |
a2fb29a5 | 2967 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2968 | return NULL; |
2969 | } | |
2970 | ||
2971 | ||
fac6795d DG |
2972 | /* |
2973 | * usage function on stderr | |
2974 | */ | |
2975 | static void usage(void) | |
2976 | { | |
b716ce68 | 2977 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2978 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2979 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2980 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2981 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2982 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2983 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2984 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2985 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2986 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2987 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2988 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2989 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2990 | } |
2991 | ||
2992 | /* | |
2993 | * daemon argument parsing | |
2994 | */ | |
2995 | static int parse_args(int argc, char **argv) | |
2996 | { | |
2997 | int c; | |
2998 | ||
2999 | static struct option long_options[] = { | |
3000 | { "client-sock", 1, 0, 'c' }, | |
3001 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
3002 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
3003 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 3004 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3005 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3006 | { "help", 0, 0, 'h' }, |
3007 | { "group", 1, 0, 'g' }, | |
3008 | { "version", 0, 0, 'V' }, | |
75462a81 | 3009 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3010 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 3011 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
3012 | { NULL, 0, 0, 0 } |
3013 | }; | |
3014 | ||
3015 | while (1) { | |
3016 | int option_index = 0; | |
54d01ffb DG |
3017 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", |
3018 | long_options, &option_index); | |
fac6795d DG |
3019 | if (c == -1) { |
3020 | break; | |
3021 | } | |
3022 | ||
3023 | switch (c) { | |
3024 | case 0: | |
3025 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3026 | if (optarg) { | |
3027 | fprintf(stderr, " with arg %s\n", optarg); | |
3028 | } | |
3029 | break; | |
b716ce68 | 3030 | case 'c': |
fac6795d DG |
3031 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3032 | break; | |
3033 | case 'a': | |
3034 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3035 | break; | |
3036 | case 'd': | |
3037 | opt_daemon = 1; | |
3038 | break; | |
3039 | case 'g': | |
3040 | opt_tracing_group = strdup(optarg); | |
3041 | break; | |
3042 | case 'h': | |
3043 | usage(); | |
3044 | exit(EXIT_FAILURE); | |
3045 | case 'V': | |
3046 | fprintf(stdout, "%s\n", VERSION); | |
3047 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3048 | case 'S': |
3049 | opt_sig_parent = 1; | |
3050 | break; | |
d6f42150 DG |
3051 | case 'E': |
3052 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3053 | break; | |
3054 | case 'C': | |
3055 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
3056 | break; | |
75462a81 DG |
3057 | case 'q': |
3058 | opt_quiet = 1; | |
3059 | break; | |
3f9947db | 3060 | case 'v': |
53086306 DG |
3061 | /* Verbose level can increase using multiple -v */ |
3062 | opt_verbose += 1; | |
3f9947db | 3063 | break; |
31f73cc9 MD |
3064 | case 'Z': |
3065 | opt_verbose_kconsumerd += 1; | |
3066 | break; | |
fac6795d DG |
3067 | default: |
3068 | /* Unknown option or other error. | |
3069 | * Error is printed by getopt, just return */ | |
3070 | return -1; | |
3071 | } | |
3072 | } | |
3073 | ||
3074 | return 0; | |
3075 | } | |
3076 | ||
3077 | /* | |
d063d709 | 3078 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3079 | * apps_sock - The communication socket for all UST apps. |
3080 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3081 | */ |
cf3af59e | 3082 | static int init_daemon_socket(void) |
fac6795d DG |
3083 | { |
3084 | int ret = 0; | |
3085 | mode_t old_umask; | |
3086 | ||
3087 | old_umask = umask(0); | |
3088 | ||
3089 | /* Create client tool unix socket */ | |
d6f42150 DG |
3090 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3091 | if (client_sock < 0) { | |
3092 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3093 | ret = -1; |
3094 | goto end; | |
3095 | } | |
3096 | ||
3097 | /* File permission MUST be 660 */ | |
3098 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3099 | if (ret < 0) { | |
d6f42150 | 3100 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3101 | perror("chmod"); |
3102 | goto end; | |
3103 | } | |
3104 | ||
3105 | /* Create the application unix socket */ | |
d6f42150 DG |
3106 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3107 | if (apps_sock < 0) { | |
3108 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3109 | ret = -1; |
3110 | goto end; | |
3111 | } | |
3112 | ||
d6f42150 | 3113 | /* File permission MUST be 666 */ |
54d01ffb DG |
3114 | ret = chmod(apps_unix_sock_path, |
3115 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3116 | if (ret < 0) { |
d6f42150 | 3117 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3118 | perror("chmod"); |
3119 | goto end; | |
3120 | } | |
3121 | ||
3122 | end: | |
3123 | umask(old_umask); | |
3124 | return ret; | |
3125 | } | |
3126 | ||
3127 | /* | |
54d01ffb DG |
3128 | * Check if the global socket is available, and if a daemon is answering at the |
3129 | * other side. If yes, error is returned. | |
fac6795d | 3130 | */ |
cf3af59e | 3131 | static int check_existing_daemon(void) |
fac6795d | 3132 | { |
7d8234d9 | 3133 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3134 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3135 | return 0; |
099e26bd | 3136 | } |
54d01ffb | 3137 | |
7d8234d9 | 3138 | /* Is there anybody out there ? */ |
099e26bd | 3139 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3140 | return -EEXIST; |
099e26bd | 3141 | } else { |
7d8234d9 | 3142 | return 0; |
099e26bd | 3143 | } |
fac6795d DG |
3144 | } |
3145 | ||
fac6795d | 3146 | /* |
d063d709 | 3147 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3148 | * |
d063d709 DG |
3149 | * Race window between mkdir and chown is OK because we are going from more |
3150 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3151 | */ |
d6f42150 | 3152 | static int set_permissions(void) |
fac6795d DG |
3153 | { |
3154 | int ret; | |
996b65c8 | 3155 | gid_t gid; |
fac6795d | 3156 | |
996b65c8 MD |
3157 | gid = allowed_group(); |
3158 | if (gid < 0) { | |
a463f419 DG |
3159 | if (is_root) { |
3160 | WARN("No tracing group detected"); | |
3161 | ret = 0; | |
3162 | } else { | |
3163 | ERR("Missing tracing group. Aborting execution."); | |
3164 | ret = -1; | |
3165 | } | |
fac6795d DG |
3166 | goto end; |
3167 | } | |
3168 | ||
d6f42150 | 3169 | /* Set lttng run dir */ |
996b65c8 | 3170 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
3171 | if (ret < 0) { |
3172 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
3173 | perror("chown"); | |
3174 | } | |
3175 | ||
3176 | /* lttng client socket path */ | |
996b65c8 | 3177 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3178 | if (ret < 0) { |
d6f42150 DG |
3179 | ERR("Unable to set group on %s", client_unix_sock_path); |
3180 | perror("chown"); | |
3181 | } | |
3182 | ||
3183 | /* kconsumerd error socket path */ | |
996b65c8 | 3184 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
3185 | if (ret < 0) { |
3186 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
3187 | perror("chown"); |
3188 | } | |
3189 | ||
d6f42150 | 3190 | DBG("All permissions are set"); |
e07ae692 | 3191 | |
fac6795d DG |
3192 | end: |
3193 | return ret; | |
3194 | } | |
3195 | ||
7a485870 | 3196 | /* |
d063d709 | 3197 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
3198 | */ |
3199 | static int create_kernel_poll_pipe(void) | |
3200 | { | |
3201 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
3202 | } | |
3203 | ||
099e26bd DG |
3204 | /* |
3205 | * Create the application command pipe to wake thread_manage_apps. | |
3206 | */ | |
3207 | static int create_apps_cmd_pipe(void) | |
3208 | { | |
3209 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
3210 | } | |
3211 | ||
d6f42150 | 3212 | /* |
d063d709 | 3213 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
3214 | */ |
3215 | static int create_lttng_rundir(void) | |
3216 | { | |
3217 | int ret; | |
3218 | ||
3219 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
3220 | if (ret < 0) { | |
b1f11e69 DG |
3221 | if (errno != EEXIST) { |
3222 | ERR("Unable to create " LTTNG_RUNDIR); | |
3223 | goto error; | |
3224 | } else { | |
3225 | ret = 0; | |
3226 | } | |
d6f42150 DG |
3227 | } |
3228 | ||
3229 | error: | |
3230 | return ret; | |
3231 | } | |
3232 | ||
3233 | /* | |
d063d709 DG |
3234 | * Setup sockets and directory needed by the kconsumerd communication with the |
3235 | * session daemon. | |
d6f42150 DG |
3236 | */ |
3237 | static int set_kconsumerd_sockets(void) | |
3238 | { | |
3239 | int ret; | |
3240 | ||
3241 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
54d01ffb DG |
3242 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, |
3243 | KCONSUMERD_ERR_SOCK_PATH); | |
d6f42150 DG |
3244 | } |
3245 | ||
3246 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
54d01ffb DG |
3247 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, |
3248 | KCONSUMERD_CMD_SOCK_PATH); | |
d6f42150 DG |
3249 | } |
3250 | ||
3251 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
3252 | if (ret < 0) { | |
6beb2242 DG |
3253 | if (errno != EEXIST) { |
3254 | ERR("Failed to create " KCONSUMERD_PATH); | |
3255 | goto error; | |
3256 | } | |
3257 | ret = 0; | |
d6f42150 DG |
3258 | } |
3259 | ||
3260 | /* Create the kconsumerd error unix socket */ | |
54d01ffb DG |
3261 | kconsumerd_err_sock = |
3262 | lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
d6f42150 DG |
3263 | if (kconsumerd_err_sock < 0) { |
3264 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
3265 | ret = -1; | |
3266 | goto error; | |
3267 | } | |
3268 | ||
3269 | /* File permission MUST be 660 */ | |
54d01ffb DG |
3270 | ret = chmod(kconsumerd_err_unix_sock_path, |
3271 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
d6f42150 DG |
3272 | if (ret < 0) { |
3273 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3274 | perror("chmod"); | |
3275 | goto error; | |
3276 | } | |
3277 | ||
3278 | error: | |
3279 | return ret; | |
3280 | } | |
3281 | ||
fac6795d | 3282 | /* |
d063d709 | 3283 | * Signal handler for the daemon |
cf3af59e | 3284 | * |
54d01ffb DG |
3285 | * Simply stop all worker threads, leaving main() return gracefully after |
3286 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3287 | */ |
3288 | static void sighandler(int sig) | |
3289 | { | |
3290 | switch (sig) { | |
cf3af59e MD |
3291 | case SIGPIPE: |
3292 | DBG("SIGPIPE catched"); | |
3293 | return; | |
3294 | case SIGINT: | |
3295 | DBG("SIGINT catched"); | |
3296 | stop_threads(); | |
3297 | break; | |
3298 | case SIGTERM: | |
3299 | DBG("SIGTERM catched"); | |
3300 | stop_threads(); | |
3301 | break; | |
3302 | default: | |
3303 | break; | |
fac6795d | 3304 | } |
fac6795d DG |
3305 | } |
3306 | ||
3307 | /* | |
d063d709 | 3308 | * Setup signal handler for : |
1d4b027a | 3309 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3310 | */ |
1d4b027a | 3311 | static int set_signal_handler(void) |
fac6795d | 3312 | { |
1d4b027a DG |
3313 | int ret = 0; |
3314 | struct sigaction sa; | |
3315 | sigset_t sigset; | |
fac6795d | 3316 | |
1d4b027a DG |
3317 | if ((ret = sigemptyset(&sigset)) < 0) { |
3318 | perror("sigemptyset"); | |
3319 | return ret; | |
3320 | } | |
d6f42150 | 3321 | |
1d4b027a DG |
3322 | sa.sa_handler = sighandler; |
3323 | sa.sa_mask = sigset; | |
3324 | sa.sa_flags = 0; | |
3325 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3326 | perror("sigaction"); | |
3327 | return ret; | |
d6f42150 DG |
3328 | } |
3329 | ||
1d4b027a DG |
3330 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3331 | perror("sigaction"); | |
3332 | return ret; | |
d6f42150 | 3333 | } |
aaf26714 | 3334 | |
1d4b027a DG |
3335 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3336 | perror("sigaction"); | |
3337 | return ret; | |
8c0faa1d DG |
3338 | } |
3339 | ||
1d4b027a DG |
3340 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3341 | ||
3342 | return ret; | |
fac6795d DG |
3343 | } |
3344 | ||
f3ed775e | 3345 | /* |
d063d709 DG |
3346 | * Set open files limit to unlimited. This daemon can open a large number of |
3347 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3348 | */ |
3349 | static void set_ulimit(void) | |
3350 | { | |
3351 | int ret; | |
3352 | struct rlimit lim; | |
3353 | ||
a88df331 | 3354 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3355 | lim.rlim_cur = 65535; |
3356 | lim.rlim_max = 65535; | |
3357 | ||
3358 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3359 | if (ret < 0) { | |
3360 | perror("failed to set open files limit"); | |
3361 | } | |
3362 | } | |
3363 | ||
fac6795d DG |
3364 | /* |
3365 | * main | |
3366 | */ | |
3367 | int main(int argc, char **argv) | |
3368 | { | |
fac6795d DG |
3369 | int ret = 0; |
3370 | void *status; | |
b082db07 | 3371 | const char *home_path; |
fac6795d | 3372 | |
273ea72c | 3373 | /* Create thread quit pipe */ |
cf3af59e MD |
3374 | if ((ret = init_thread_quit_pipe()) < 0) { |
3375 | goto error; | |
273ea72c DG |
3376 | } |
3377 | ||
fac6795d DG |
3378 | /* Parse arguments */ |
3379 | progname = argv[0]; | |
3380 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3381 | goto error; |
fac6795d DG |
3382 | } |
3383 | ||
3384 | /* Daemonize */ | |
3385 | if (opt_daemon) { | |
53094c05 DG |
3386 | ret = daemon(0, 0); |
3387 | if (ret < 0) { | |
3388 | perror("daemon"); | |
cf3af59e | 3389 | goto error; |
53094c05 | 3390 | } |
fac6795d DG |
3391 | } |
3392 | ||
3393 | /* Check if daemon is UID = 0 */ | |
3394 | is_root = !getuid(); | |
3395 | ||
fac6795d | 3396 | if (is_root) { |
d6f42150 DG |
3397 | ret = create_lttng_rundir(); |
3398 | if (ret < 0) { | |
cf3af59e | 3399 | goto error; |
d6f42150 DG |
3400 | } |
3401 | ||
fac6795d | 3402 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3403 | snprintf(apps_unix_sock_path, PATH_MAX, |
3404 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3405 | } |
3406 | ||
3407 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3408 | snprintf(client_unix_sock_path, PATH_MAX, |
3409 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3410 | } | |
0fdd1e2c DG |
3411 | |
3412 | /* Set global SHM for ust */ | |
3413 | if (strlen(wait_shm_path) == 0) { | |
3414 | snprintf(wait_shm_path, PATH_MAX, | |
3415 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3416 | } | |
fac6795d | 3417 | } else { |
b082db07 DG |
3418 | home_path = get_home_dir(); |
3419 | if (home_path == NULL) { | |
273ea72c DG |
3420 | /* TODO: Add --socket PATH option */ |
3421 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3422 | ret = -EPERM; |
3423 | goto error; | |
b082db07 DG |
3424 | } |
3425 | ||
fac6795d | 3426 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3427 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3428 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3429 | } |
3430 | ||
3431 | /* Set the cli tool unix socket path */ | |
3432 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3433 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3434 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3435 | } |
0fdd1e2c DG |
3436 | |
3437 | /* Set global SHM for ust */ | |
3438 | if (strlen(wait_shm_path) == 0) { | |
3439 | snprintf(wait_shm_path, PATH_MAX, | |
3440 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3441 | } | |
fac6795d DG |
3442 | } |
3443 | ||
847177cd DG |
3444 | DBG("Client socket path %s", client_unix_sock_path); |
3445 | DBG("Application socket path %s", apps_unix_sock_path); | |
3446 | ||
273ea72c | 3447 | /* |
7d8234d9 | 3448 | * See if daemon already exist. |
fac6795d | 3449 | */ |
7d8234d9 | 3450 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3451 | ERR("Already running daemon.\n"); |
273ea72c | 3452 | /* |
cf3af59e MD |
3453 | * We do not goto exit because we must not cleanup() |
3454 | * because a daemon is already running. | |
ab118b20 | 3455 | */ |
cf3af59e | 3456 | goto error; |
a88df331 DG |
3457 | } |
3458 | ||
54d01ffb | 3459 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
3460 | |
3461 | /* | |
3462 | * These actions must be executed as root. We do that *after* setting up | |
3463 | * the sockets path because we MUST make the check for another daemon using | |
3464 | * those paths *before* trying to set the kernel consumer sockets and init | |
3465 | * kernel tracer. | |
3466 | */ | |
3467 | if (is_root) { | |
3468 | ret = set_kconsumerd_sockets(); | |
3469 | if (ret < 0) { | |
cf3af59e | 3470 | goto exit; |
a88df331 DG |
3471 | } |
3472 | ||
3473 | /* Setup kernel tracer */ | |
3474 | init_kernel_tracer(); | |
3475 | ||
3476 | /* Set ulimit for open files */ | |
3477 | set_ulimit(); | |
fac6795d DG |
3478 | } |
3479 | ||
cf3af59e MD |
3480 | if ((ret = set_signal_handler()) < 0) { |
3481 | goto exit; | |
fac6795d DG |
3482 | } |
3483 | ||
d6f42150 | 3484 | /* Setup the needed unix socket */ |
cf3af59e MD |
3485 | if ((ret = init_daemon_socket()) < 0) { |
3486 | goto exit; | |
fac6795d DG |
3487 | } |
3488 | ||
3489 | /* Set credentials to socket */ | |
cf3af59e MD |
3490 | if (is_root && ((ret = set_permissions()) < 0)) { |
3491 | goto exit; | |
fac6795d DG |
3492 | } |
3493 | ||
5b8719f5 DG |
3494 | /* Get parent pid if -S, --sig-parent is specified. */ |
3495 | if (opt_sig_parent) { | |
3496 | ppid = getppid(); | |
3497 | } | |
3498 | ||
7a485870 | 3499 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3500 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3501 | goto exit; | |
7a485870 DG |
3502 | } |
3503 | ||
099e26bd DG |
3504 | /* Setup the thread apps communication pipe. */ |
3505 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3506 | goto exit; | |
3507 | } | |
3508 | ||
3509 | /* Init UST command queue. */ | |
3510 | cds_wfq_init(&ust_cmd_queue.queue); | |
3511 | ||
273ea72c | 3512 | /* |
54d01ffb DG |
3513 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
3514 | * statically declared in session.c | |
273ea72c | 3515 | */ |
54d01ffb | 3516 | session_list_ptr = session_get_list(); |
b5541356 | 3517 | |
5eb91c98 DG |
3518 | /* Set up max poll set size */ |
3519 | lttng_poll_set_max_size(); | |
3520 | ||
cf3af59e | 3521 | /* Create thread to manage the client socket */ |
099e26bd DG |
3522 | ret = pthread_create(&client_thread, NULL, |
3523 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3524 | if (ret != 0) { |
099e26bd | 3525 | perror("pthread_create clients"); |
cf3af59e MD |
3526 | goto exit_client; |
3527 | } | |
fac6795d | 3528 | |
099e26bd DG |
3529 | /* Create thread to dispatch registration */ |
3530 | ret = pthread_create(&dispatch_thread, NULL, | |
3531 | thread_dispatch_ust_registration, (void *) NULL); | |
3532 | if (ret != 0) { | |
3533 | perror("pthread_create dispatch"); | |
3534 | goto exit_dispatch; | |
3535 | } | |
3536 | ||
3537 | /* Create thread to manage application registration. */ | |
3538 | ret = pthread_create(®_apps_thread, NULL, | |
3539 | thread_registration_apps, (void *) NULL); | |
3540 | if (ret != 0) { | |
3541 | perror("pthread_create registration"); | |
3542 | goto exit_reg_apps; | |
3543 | } | |
3544 | ||
cf3af59e | 3545 | /* Create thread to manage application socket */ |
54d01ffb DG |
3546 | ret = pthread_create(&apps_thread, NULL, |
3547 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 3548 | if (ret != 0) { |
099e26bd | 3549 | perror("pthread_create apps"); |
cf3af59e MD |
3550 | goto exit_apps; |
3551 | } | |
fac6795d | 3552 | |
cf3af59e | 3553 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
3554 | ret = pthread_create(&kernel_thread, NULL, |
3555 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 3556 | if (ret != 0) { |
099e26bd | 3557 | perror("pthread_create kernel"); |
cf3af59e MD |
3558 | goto exit_kernel; |
3559 | } | |
7a485870 | 3560 | |
cf3af59e MD |
3561 | ret = pthread_join(kernel_thread, &status); |
3562 | if (ret != 0) { | |
3563 | perror("pthread_join"); | |
3564 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3565 | } |
3566 | ||
cf3af59e MD |
3567 | exit_kernel: |
3568 | ret = pthread_join(apps_thread, &status); | |
3569 | if (ret != 0) { | |
3570 | perror("pthread_join"); | |
3571 | goto error; /* join error, exit without cleanup */ | |
3572 | } | |
fac6795d | 3573 | |
cf3af59e | 3574 | exit_apps: |
099e26bd DG |
3575 | ret = pthread_join(reg_apps_thread, &status); |
3576 | if (ret != 0) { | |
3577 | perror("pthread_join"); | |
3578 | goto error; /* join error, exit without cleanup */ | |
3579 | } | |
3580 | ||
3581 | exit_reg_apps: | |
3582 | ret = pthread_join(dispatch_thread, &status); | |
3583 | if (ret != 0) { | |
3584 | perror("pthread_join"); | |
3585 | goto error; /* join error, exit without cleanup */ | |
3586 | } | |
3587 | ||
3588 | exit_dispatch: | |
cf3af59e MD |
3589 | ret = pthread_join(client_thread, &status); |
3590 | if (ret != 0) { | |
3591 | perror("pthread_join"); | |
3592 | goto error; /* join error, exit without cleanup */ | |
3593 | } | |
3594 | ||
3595 | ret = join_kconsumerd_thread(); | |
3596 | if (ret != 0) { | |
3597 | perror("join_kconsumerd"); | |
3598 | goto error; /* join error, exit without cleanup */ | |
3599 | } | |
a88df331 | 3600 | |
cf3af59e | 3601 | exit_client: |
a88df331 | 3602 | exit: |
cf3af59e MD |
3603 | /* |
3604 | * cleanup() is called when no other thread is running. | |
3605 | */ | |
3606 | cleanup(); | |
3607 | if (!ret) | |
3608 | exit(EXIT_SUCCESS); | |
3609 | error: | |
5e16da05 | 3610 | exit(EXIT_FAILURE); |
fac6795d | 3611 | } |