Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
fac6795d DG |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
91d76f53 | 8 | * |
fac6795d DG |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
fac6795d DG |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple 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> | |
7a485870 | 24 | #include <poll.h> |
fac6795d | 25 | #include <pthread.h> |
8c0faa1d | 26 | #include <semaphore.h> |
fac6795d DG |
27 | #include <signal.h> |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
31 | #include <sys/ipc.h> | |
b73401da | 32 | #include <sys/mount.h> |
fac6795d DG |
33 | #include <sys/shm.h> |
34 | #include <sys/socket.h> | |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
f3ed775e DG |
37 | #include <sys/time.h> |
38 | #include <sys/resource.h> | |
fac6795d DG |
39 | #include <unistd.h> |
40 | ||
41 | #include <urcu/list.h> /* URCU list library (-lurcu) */ | |
5b97ec60 | 42 | #include <lttng/lttng.h> |
fac6795d DG |
43 | |
44 | #include "liblttsessiondcomm.h" | |
45 | #include "ltt-sessiond.h" | |
75462a81 | 46 | #include "lttngerr.h" |
20fe2104 | 47 | #include "kernel-ctl.h" |
9e78d6ae | 48 | #include "ust-ctl.h" |
5b74c7b1 | 49 | #include "session.h" |
91d76f53 | 50 | #include "traceable-app.h" |
5dc18550 | 51 | #include "lttng-kconsumerd.h" |
8e68d1c8 | 52 | #include "utils.h" |
fac6795d | 53 | |
75462a81 | 54 | /* Const values */ |
686204ab | 55 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 56 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
57 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
58 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
59 | ||
fac6795d | 60 | /* Variables */ |
1d4b027a DG |
61 | int opt_verbose; /* Not static for lttngerr.h */ |
62 | int opt_quiet; /* Not static for lttngerr.h */ | |
d063d709 | 63 | |
fac6795d DG |
64 | const char *progname; |
65 | const char *opt_tracing_group; | |
5b8719f5 | 66 | static int opt_sig_parent; |
fac6795d DG |
67 | static int opt_daemon; |
68 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
69 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
70 | static pid_t kconsumerd_pid; | |
7a485870 | 71 | static struct pollfd *kernel_pollfd; |
fac6795d | 72 | |
d6f42150 DG |
73 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
74 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
75 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
76 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
fac6795d | 77 | |
1d4b027a | 78 | /* Sockets and FDs */ |
d6f42150 DG |
79 | static int client_sock; |
80 | static int apps_sock; | |
81 | static int kconsumerd_err_sock; | |
8c0faa1d | 82 | static int kconsumerd_cmd_sock; |
20fe2104 | 83 | static int kernel_tracer_fd; |
7a485870 | 84 | static int kernel_poll_pipe[2]; |
1d4b027a | 85 | |
273ea72c DG |
86 | /* |
87 | * Quit pipe for all threads. This permits a single cancellation point | |
88 | * for all threads when receiving an event on the pipe. | |
89 | */ | |
90 | static int thread_quit_pipe[2]; | |
91 | ||
1d4b027a | 92 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 93 | static pthread_t kconsumerd_thread; |
1d4b027a DG |
94 | static pthread_t apps_thread; |
95 | static pthread_t client_thread; | |
7a485870 | 96 | static pthread_t kernel_thread; |
8c0faa1d DG |
97 | static sem_t kconsumerd_sem; |
98 | ||
1d4b027a | 99 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
fac6795d | 100 | |
b5541356 DG |
101 | /* |
102 | * Pointer initialized before thread creation. | |
103 | * | |
104 | * This points to the tracing session list containing the session count and a | |
105 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
106 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 107 | * |
d063d709 DG |
108 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
109 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
110 | */ |
111 | static struct ltt_session_list *session_list_ptr; | |
112 | ||
273ea72c DG |
113 | /* |
114 | * Init quit pipe. | |
115 | * | |
116 | * Return -1 on error or 0 if all pipes are created. | |
117 | */ | |
118 | static int init_thread_quit_pipe(void) | |
119 | { | |
120 | int ret; | |
121 | ||
122 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
123 | if (ret < 0) { | |
124 | perror("thread quit pipe"); | |
125 | goto error; | |
126 | } | |
127 | ||
128 | error: | |
129 | return ret; | |
130 | } | |
131 | ||
fac6795d | 132 | /* |
d063d709 DG |
133 | * Complete teardown of a kernel session. This free all data structure related |
134 | * to a kernel session and update counter. | |
fac6795d | 135 | */ |
1d4b027a | 136 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 137 | { |
1d4b027a DG |
138 | if (session->kernel_session != NULL) { |
139 | DBG("Tearing down kernel session"); | |
c363b55d | 140 | trace_destroy_kernel_session(session->kernel_session); |
1d4b027a DG |
141 | /* Extra precaution */ |
142 | session->kernel_session = NULL; | |
fac6795d | 143 | } |
fac6795d DG |
144 | } |
145 | ||
146 | /* | |
d063d709 | 147 | * Cleanup the daemon |
fac6795d | 148 | */ |
1d4b027a | 149 | static void cleanup() |
fac6795d | 150 | { |
1d4b027a DG |
151 | int ret; |
152 | char *cmd; | |
153 | struct ltt_session *sess; | |
fac6795d | 154 | |
1d4b027a | 155 | DBG("Cleaning up"); |
e07ae692 | 156 | |
1d4b027a | 157 | /* <fun> */ |
273ea72c DG |
158 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
159 | "Matthew, BEET driven development works!%c[%dm", | |
160 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 161 | /* </fun> */ |
fac6795d | 162 | |
1d4b027a DG |
163 | /* Stopping all threads */ |
164 | DBG("Terminating all threads"); | |
273ea72c DG |
165 | close(thread_quit_pipe[0]); |
166 | close(thread_quit_pipe[1]); | |
fac6795d | 167 | |
1d4b027a DG |
168 | DBG("Removing %s directory", LTTNG_RUNDIR); |
169 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
170 | if (ret < 0) { | |
171 | ERR("asprintf failed. Something is really wrong!"); | |
172 | } | |
5461b305 | 173 | |
1d4b027a DG |
174 | /* Remove lttng run directory */ |
175 | ret = system(cmd); | |
176 | if (ret < 0) { | |
177 | ERR("Unable to clean " LTTNG_RUNDIR); | |
178 | } | |
5461b305 | 179 | |
1d4b027a | 180 | DBG("Cleaning up all session"); |
fac6795d | 181 | |
b5541356 | 182 | /* Destroy session list mutex */ |
273ea72c DG |
183 | if (session_list_ptr != NULL) { |
184 | pthread_mutex_destroy(&session_list_ptr->lock); | |
185 | ||
186 | /* Cleanup ALL session */ | |
187 | cds_list_for_each_entry(sess, &session_list_ptr->head, list) { | |
188 | teardown_kernel_session(sess); | |
189 | // TODO complete session cleanup (including UST) | |
190 | } | |
191 | } | |
192 | ||
193 | pthread_mutex_destroy(&kconsumerd_pid_mutex); | |
b5541356 | 194 | |
f3ed775e | 195 | DBG("Closing kernel fd"); |
1d4b027a | 196 | close(kernel_tracer_fd); |
fac6795d DG |
197 | } |
198 | ||
e065084a | 199 | /* |
d063d709 | 200 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 201 | * |
d063d709 | 202 | * Return lttcomm error code. |
e065084a DG |
203 | */ |
204 | static int send_unix_sock(int sock, void *buf, size_t len) | |
205 | { | |
206 | /* Check valid length */ | |
207 | if (len <= 0) { | |
208 | return -1; | |
209 | } | |
210 | ||
211 | return lttcomm_send_unix_sock(sock, buf, len); | |
212 | } | |
213 | ||
5461b305 | 214 | /* |
d063d709 | 215 | * Free memory of a command context structure. |
5461b305 | 216 | */ |
a2fb29a5 | 217 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 218 | { |
a2fb29a5 DG |
219 | DBG("Clean command context structure"); |
220 | if (*cmd_ctx) { | |
221 | if ((*cmd_ctx)->llm) { | |
222 | free((*cmd_ctx)->llm); | |
5461b305 | 223 | } |
a2fb29a5 DG |
224 | if ((*cmd_ctx)->lsm) { |
225 | free((*cmd_ctx)->lsm); | |
5461b305 | 226 | } |
a2fb29a5 DG |
227 | free(*cmd_ctx); |
228 | *cmd_ctx = NULL; | |
5461b305 DG |
229 | } |
230 | } | |
231 | ||
f3ed775e | 232 | /* |
d063d709 | 233 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 234 | */ |
7a485870 | 235 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
236 | { |
237 | int ret; | |
238 | size_t nb_fd; | |
239 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
240 | struct lttcomm_kconsumerd_header lkh; |
241 | struct lttcomm_kconsumerd_msg lkm; | |
242 | ||
7a485870 DG |
243 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
244 | ||
245 | nb_fd = channel->stream_count; | |
f3ed775e DG |
246 | |
247 | /* Setup header */ | |
7a485870 | 248 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
249 | lkh.cmd_type = ADD_STREAM; |
250 | ||
251 | DBG("Sending kconsumerd header"); | |
252 | ||
253 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
254 | if (ret < 0) { | |
255 | perror("send kconsumerd header"); | |
256 | goto error; | |
257 | } | |
258 | ||
7a485870 DG |
259 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
260 | if (stream->fd != 0) { | |
f3ed775e DG |
261 | lkm.fd = stream->fd; |
262 | lkm.state = stream->state; | |
7a485870 | 263 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
f3ed775e DG |
264 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
265 | ||
266 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
267 | ||
268 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
269 | if (ret < 0) { | |
270 | perror("send kconsumerd fd"); | |
271 | goto error; | |
272 | } | |
273 | } | |
274 | } | |
275 | ||
7a485870 | 276 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
277 | |
278 | return 0; | |
279 | ||
280 | error: | |
281 | return ret; | |
282 | } | |
283 | ||
284 | /* | |
d063d709 | 285 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 286 | */ |
7a485870 | 287 | static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session) |
f3ed775e DG |
288 | { |
289 | int ret; | |
290 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
291 | struct lttcomm_kconsumerd_header lkh; |
292 | struct lttcomm_kconsumerd_msg lkm; | |
293 | ||
294 | /* Setup header */ | |
295 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
296 | lkh.cmd_type = ADD_STREAM; | |
297 | ||
298 | DBG("Sending kconsumerd header for metadata"); | |
299 | ||
300 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
301 | if (ret < 0) { | |
302 | perror("send kconsumerd header"); | |
303 | goto error; | |
304 | } | |
305 | ||
306 | DBG("Sending metadata stream fd"); | |
307 | ||
308 | if (session->metadata_stream_fd != 0) { | |
309 | /* Send metadata stream fd first */ | |
310 | lkm.fd = session->metadata_stream_fd; | |
311 | lkm.state = ACTIVE_FD; | |
312 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
313 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); | |
314 | ||
315 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
316 | if (ret < 0) { | |
317 | perror("send kconsumerd fd"); | |
318 | goto error; | |
319 | } | |
320 | } | |
f3ed775e | 321 | |
f3ed775e | 322 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
7a485870 | 323 | ret = send_kconsumerd_channel_fds(sock, chan); |
f3ed775e | 324 | if (ret < 0) { |
7a485870 | 325 | goto error; |
f3ed775e DG |
326 | } |
327 | } | |
328 | ||
7a485870 DG |
329 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
330 | ||
f3ed775e DG |
331 | return 0; |
332 | ||
333 | error: | |
334 | return ret; | |
335 | } | |
336 | ||
97b1a726 | 337 | #ifdef DISABLED |
fac6795d | 338 | /* |
d063d709 DG |
339 | * Return a socket connected to the libust communication socket of the |
340 | * application identified by the pid. | |
fac6795d | 341 | * |
d063d709 | 342 | * If the pid is not found in the traceable list, return -1 to indicate error. |
fac6795d | 343 | */ |
471d1693 | 344 | static int ust_connect_app(pid_t pid) |
fac6795d | 345 | { |
91d76f53 DG |
346 | int sock; |
347 | struct ltt_traceable_app *lta; | |
379473d2 | 348 | |
e07ae692 DG |
349 | DBG("Connect to application pid %d", pid); |
350 | ||
91d76f53 DG |
351 | lta = find_app_by_pid(pid); |
352 | if (lta == NULL) { | |
353 | /* App not found */ | |
7442b2ba | 354 | DBG("Application pid %d not found", pid); |
379473d2 DG |
355 | return -1; |
356 | } | |
fac6795d | 357 | |
91d76f53 | 358 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 359 | if (sock < 0) { |
62d3069f | 360 | ERR("Fail connecting to the PID %d", pid); |
fac6795d DG |
361 | } |
362 | ||
363 | return sock; | |
364 | } | |
97b1a726 | 365 | #endif /* DISABLED */ |
fac6795d DG |
366 | |
367 | /* | |
d063d709 DG |
368 | * Notify apps by writing 42 to a named pipe using name. Every applications |
369 | * waiting for a ltt-sessiond will be notified and re-register automatically to | |
370 | * the session daemon. | |
fac6795d | 371 | * |
d063d709 | 372 | * Return open or write error value. |
fac6795d DG |
373 | */ |
374 | static int notify_apps(const char *name) | |
375 | { | |
376 | int fd; | |
377 | int ret = -1; | |
378 | ||
e07ae692 DG |
379 | DBG("Notify the global application pipe"); |
380 | ||
fac6795d DG |
381 | /* Try opening the global pipe */ |
382 | fd = open(name, O_WRONLY); | |
383 | if (fd < 0) { | |
384 | goto error; | |
385 | } | |
386 | ||
387 | /* Notify by writing on the pipe */ | |
388 | ret = write(fd, "42", 2); | |
389 | if (ret < 0) { | |
390 | perror("write"); | |
391 | } | |
392 | ||
393 | error: | |
394 | return ret; | |
395 | } | |
396 | ||
e065084a | 397 | /* |
d063d709 DG |
398 | * Setup the outgoing data buffer for the response (llm) by allocating the |
399 | * right amount of memory and copying the original information from the lsm | |
400 | * structure. | |
ca95a216 | 401 | * |
d063d709 | 402 | * Return total size of the buffer pointed by buf. |
ca95a216 | 403 | */ |
5461b305 | 404 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 405 | { |
f3ed775e | 406 | int ret, buf_size; |
ca95a216 | 407 | |
f3ed775e | 408 | buf_size = size; |
5461b305 DG |
409 | |
410 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
411 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 412 | perror("malloc"); |
5461b305 | 413 | ret = -ENOMEM; |
ca95a216 DG |
414 | goto error; |
415 | } | |
416 | ||
5461b305 DG |
417 | /* Copy common data */ |
418 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
419 | cmd_ctx->llm->pid = cmd_ctx->lsm->pid; | |
5461b305 | 420 | |
5461b305 DG |
421 | cmd_ctx->llm->data_size = size; |
422 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
423 | ||
ca95a216 DG |
424 | return buf_size; |
425 | ||
426 | error: | |
427 | return ret; | |
428 | } | |
429 | ||
7a485870 | 430 | /* |
d063d709 DG |
431 | * Update the kernel pollfd set of all channel fd available over all tracing |
432 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
433 | */ |
434 | static int update_kernel_pollfd(void) | |
435 | { | |
436 | int i = 0; | |
273ea72c DG |
437 | /* |
438 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
439 | * at 2 for those pipes. | |
440 | */ | |
441 | unsigned int nb_fd = 2; | |
7a485870 DG |
442 | struct ltt_session *session; |
443 | struct ltt_kernel_channel *channel; | |
444 | ||
445 | DBG("Updating kernel_pollfd"); | |
446 | ||
447 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 448 | lock_session_list(); |
b5541356 DG |
449 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
450 | lock_session(session); | |
7a485870 | 451 | if (session->kernel_session == NULL) { |
b5541356 | 452 | unlock_session(session); |
7a485870 DG |
453 | continue; |
454 | } | |
455 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 456 | unlock_session(session); |
7a485870 DG |
457 | } |
458 | ||
459 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
460 | ||
461 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
462 | if (kernel_pollfd == NULL) { | |
463 | perror("malloc kernel_pollfd"); | |
464 | goto error; | |
465 | } | |
466 | ||
b5541356 DG |
467 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
468 | lock_session(session); | |
7a485870 | 469 | if (session->kernel_session == NULL) { |
b5541356 | 470 | unlock_session(session); |
7a485870 DG |
471 | continue; |
472 | } | |
473 | if (i >= nb_fd) { | |
474 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 475 | unlock_session(session); |
7a485870 DG |
476 | break; |
477 | } | |
478 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
479 | kernel_pollfd[i].fd = channel->fd; | |
480 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
481 | i++; | |
482 | } | |
b5541356 | 483 | unlock_session(session); |
7a485870 | 484 | } |
6c9cc2ab | 485 | unlock_session_list(); |
7a485870 DG |
486 | |
487 | /* Adding wake up pipe */ | |
273ea72c DG |
488 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
489 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
490 | ||
491 | /* Adding the quit pipe */ | |
492 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
493 | |
494 | return nb_fd; | |
495 | ||
496 | error: | |
6c9cc2ab | 497 | unlock_session_list(); |
7a485870 DG |
498 | return -1; |
499 | } | |
500 | ||
501 | /* | |
d063d709 DG |
502 | * Find the channel fd from 'fd' over all tracing session. When found, check |
503 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 504 | * |
d063d709 | 505 | * Useful for CPU hotplug feature. |
7a485870 DG |
506 | */ |
507 | static int update_kernel_stream(int fd) | |
508 | { | |
509 | int ret = 0; | |
510 | struct ltt_session *session; | |
511 | struct ltt_kernel_channel *channel; | |
512 | ||
513 | DBG("Updating kernel streams for channel fd %d", fd); | |
514 | ||
6c9cc2ab | 515 | lock_session_list(); |
b5541356 DG |
516 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
517 | lock_session(session); | |
7a485870 | 518 | if (session->kernel_session == NULL) { |
b5541356 | 519 | unlock_session(session); |
7a485870 DG |
520 | continue; |
521 | } | |
522 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
523 | if (channel->fd == fd) { | |
524 | DBG("Channel found, updating kernel streams"); | |
525 | ret = kernel_open_channel_stream(channel); | |
526 | if (ret < 0) { | |
527 | goto end; | |
528 | } | |
529 | /* | |
530 | * Have we already sent fds to the consumer? If yes, it means that | |
531 | * tracing is started so it is safe to send our updated stream fds. | |
532 | */ | |
533 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
534 | ret = send_kconsumerd_channel_fds(kconsumerd_cmd_sock, channel); | |
535 | if (ret < 0) { | |
536 | goto end; | |
537 | } | |
538 | } | |
539 | goto end; | |
540 | } | |
541 | } | |
b5541356 | 542 | unlock_session(session); |
7a485870 DG |
543 | } |
544 | ||
545 | end: | |
6c9cc2ab | 546 | unlock_session_list(); |
b5541356 DG |
547 | if (session) { |
548 | unlock_session(session); | |
549 | } | |
7a485870 DG |
550 | return ret; |
551 | } | |
552 | ||
553 | /* | |
d063d709 | 554 | * This thread manage event coming from the kernel. |
7a485870 | 555 | * |
d063d709 DG |
556 | * Features supported in this thread: |
557 | * -) CPU Hotplug | |
7a485870 DG |
558 | */ |
559 | static void *thread_manage_kernel(void *data) | |
560 | { | |
561 | int ret, i, nb_fd = 0; | |
562 | char tmp; | |
563 | int update_poll_flag = 1; | |
564 | ||
565 | DBG("Thread manage kernel started"); | |
566 | ||
567 | while (1) { | |
568 | if (update_poll_flag == 1) { | |
569 | nb_fd = update_kernel_pollfd(); | |
570 | if (nb_fd < 0) { | |
571 | goto error; | |
572 | } | |
573 | update_poll_flag = 0; | |
574 | } | |
575 | ||
576 | DBG("Polling on %d fds", nb_fd); | |
577 | ||
578 | /* Poll infinite value of time */ | |
579 | ret = poll(kernel_pollfd, nb_fd, -1); | |
580 | if (ret < 0) { | |
581 | perror("poll kernel thread"); | |
582 | goto error; | |
583 | } else if (ret == 0) { | |
584 | /* Should not happen since timeout is infinite */ | |
585 | continue; | |
586 | } | |
587 | ||
273ea72c DG |
588 | /* Thread quit pipe has been closed. Killing thread. */ |
589 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
590 | goto error; | |
591 | } | |
592 | ||
7a485870 DG |
593 | DBG("Kernel poll event triggered"); |
594 | ||
595 | /* | |
596 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
597 | * must be updated. | |
598 | */ | |
273ea72c | 599 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 600 | case POLLIN: |
7a485870 DG |
601 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
602 | update_poll_flag = 1; | |
603 | continue; | |
b5541356 DG |
604 | case POLLERR: |
605 | goto error; | |
606 | default: | |
607 | break; | |
7a485870 DG |
608 | } |
609 | ||
610 | for (i = 0; i < nb_fd; i++) { | |
611 | switch (kernel_pollfd[i].revents) { | |
612 | /* | |
613 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
614 | * session and updating the kernel consumer | |
615 | */ | |
616 | case POLLIN | POLLRDNORM: | |
617 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
618 | if (ret < 0) { | |
619 | continue; | |
620 | } | |
621 | break; | |
622 | } | |
623 | } | |
624 | } | |
625 | ||
626 | error: | |
627 | DBG("Kernel thread dying"); | |
628 | if (kernel_pollfd) { | |
629 | free(kernel_pollfd); | |
630 | } | |
273ea72c DG |
631 | |
632 | close(kernel_poll_pipe[0]); | |
633 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
634 | return NULL; |
635 | } | |
636 | ||
1d4b027a | 637 | /* |
d063d709 | 638 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
639 | */ |
640 | static void *thread_manage_kconsumerd(void *data) | |
641 | { | |
273ea72c | 642 | int sock = 0, ret; |
1d4b027a | 643 | enum lttcomm_return_code code; |
273ea72c | 644 | struct pollfd pollfd[2]; |
1d4b027a DG |
645 | |
646 | DBG("[thread] Manage kconsumerd started"); | |
647 | ||
648 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
649 | if (ret < 0) { | |
650 | goto error; | |
651 | } | |
652 | ||
273ea72c DG |
653 | /* First fd is always the quit pipe */ |
654 | pollfd[0].fd = thread_quit_pipe[0]; | |
655 | ||
656 | /* Apps socket */ | |
657 | pollfd[1].fd = kconsumerd_err_sock; | |
658 | pollfd[1].events = POLLIN; | |
659 | ||
660 | /* Inifinite blocking call, waiting for transmission */ | |
661 | ret = poll(pollfd, 2, -1); | |
662 | if (ret < 0) { | |
663 | perror("poll kconsumerd thread"); | |
664 | goto error; | |
665 | } | |
666 | ||
667 | /* Thread quit pipe has been closed. Killing thread. */ | |
668 | if (pollfd[0].revents == POLLNVAL) { | |
669 | goto error; | |
670 | } else if (pollfd[1].revents == POLLERR) { | |
671 | ERR("Kconsumerd err socket poll error"); | |
672 | goto error; | |
673 | } | |
674 | ||
1d4b027a DG |
675 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
676 | if (sock < 0) { | |
677 | goto error; | |
678 | } | |
679 | ||
712ea556 | 680 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
681 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
682 | if (ret <= 0) { | |
683 | goto error; | |
684 | } | |
685 | ||
686 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
687 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
688 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 689 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
690 | perror("kconsumerd connect"); |
691 | goto error; | |
692 | } | |
693 | /* Signal condition to tell that the kconsumerd is ready */ | |
694 | sem_post(&kconsumerd_sem); | |
695 | DBG("Kconsumerd command socket ready"); | |
696 | } else { | |
6f61d021 | 697 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
698 | lttcomm_get_readable_code(-code)); |
699 | goto error; | |
700 | } | |
701 | ||
712ea556 DG |
702 | /* Wait for any kconsumerd error */ |
703 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
704 | if (ret <= 0) { | |
705 | ERR("Kconsumerd closed the command socket"); | |
706 | goto error; | |
6f61d021 | 707 | } |
1d4b027a | 708 | |
712ea556 DG |
709 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
710 | ||
1d4b027a | 711 | error: |
6f61d021 | 712 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
713 | if (kconsumerd_err_sock) { |
714 | close(kconsumerd_err_sock); | |
715 | } | |
716 | if (kconsumerd_cmd_sock) { | |
717 | close(kconsumerd_cmd_sock); | |
718 | } | |
719 | if (sock) { | |
720 | close(sock); | |
721 | } | |
722 | ||
723 | unlink(kconsumerd_err_unix_sock_path); | |
724 | unlink(kconsumerd_cmd_unix_sock_path); | |
725 | ||
726 | kconsumerd_pid = 0; | |
1d4b027a DG |
727 | return NULL; |
728 | } | |
729 | ||
730 | /* | |
1d4b027a DG |
731 | * This thread manage the application socket communication |
732 | */ | |
733 | static void *thread_manage_apps(void *data) | |
734 | { | |
273ea72c DG |
735 | int sock = 0, ret; |
736 | struct pollfd pollfd[2]; | |
1d4b027a DG |
737 | |
738 | /* TODO: Something more elegant is needed but fine for now */ | |
739 | /* FIXME: change all types to either uint8_t, uint32_t, uint64_t | |
740 | * for 32-bit vs 64-bit compat processes. */ | |
741 | /* replicate in ust with version number */ | |
742 | struct { | |
743 | int reg; /* 1:register, 0:unregister */ | |
744 | pid_t pid; | |
745 | uid_t uid; | |
746 | } reg_msg; | |
747 | ||
748 | DBG("[thread] Manage apps started"); | |
749 | ||
750 | ret = lttcomm_listen_unix_sock(apps_sock); | |
751 | if (ret < 0) { | |
752 | goto error; | |
753 | } | |
754 | ||
273ea72c DG |
755 | /* First fd is always the quit pipe */ |
756 | pollfd[0].fd = thread_quit_pipe[0]; | |
757 | ||
758 | /* Apps socket */ | |
759 | pollfd[1].fd = apps_sock; | |
760 | pollfd[1].events = POLLIN; | |
761 | ||
1d4b027a DG |
762 | /* Notify all applications to register */ |
763 | notify_apps(default_global_apps_pipe); | |
764 | ||
765 | while (1) { | |
766 | DBG("Accepting application registration"); | |
273ea72c DG |
767 | |
768 | /* Inifinite blocking call, waiting for transmission */ | |
769 | ret = poll(pollfd, 2, -1); | |
770 | if (ret < 0) { | |
771 | perror("poll apps thread"); | |
772 | goto error; | |
773 | } | |
774 | ||
775 | /* Thread quit pipe has been closed. Killing thread. */ | |
776 | if (pollfd[0].revents == POLLNVAL) { | |
777 | goto error; | |
778 | } else if (pollfd[1].revents == POLLERR) { | |
779 | ERR("Apps socket poll error"); | |
780 | goto error; | |
781 | } | |
782 | ||
1d4b027a DG |
783 | sock = lttcomm_accept_unix_sock(apps_sock); |
784 | if (sock < 0) { | |
785 | goto error; | |
786 | } | |
787 | ||
273ea72c DG |
788 | /* |
789 | * Basic recv here to handle the very simple data | |
1d4b027a DG |
790 | * that the libust send to register (reg_msg). |
791 | */ | |
792 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
793 | if (ret < 0) { | |
794 | perror("recv"); | |
795 | continue; | |
796 | } | |
797 | ||
798 | /* Add application to the global traceable list */ | |
799 | if (reg_msg.reg == 1) { | |
800 | /* Registering */ | |
801 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); | |
802 | if (ret < 0) { | |
803 | /* register_traceable_app only return an error with | |
804 | * ENOMEM. At this point, we better stop everything. | |
805 | */ | |
806 | goto error; | |
807 | } | |
808 | } else { | |
809 | /* Unregistering */ | |
810 | unregister_traceable_app(reg_msg.pid); | |
811 | } | |
812 | } | |
813 | ||
814 | error: | |
273ea72c DG |
815 | DBG("Apps thread dying"); |
816 | if (apps_sock) { | |
817 | close(apps_sock); | |
818 | } | |
819 | if (sock) { | |
820 | close(sock); | |
821 | } | |
1d4b027a | 822 | |
273ea72c | 823 | unlink(apps_unix_sock_path); |
1d4b027a DG |
824 | return NULL; |
825 | } | |
826 | ||
8c0faa1d | 827 | /* |
d063d709 DG |
828 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
829 | * exec or it will fails. | |
8c0faa1d | 830 | */ |
693bd40b | 831 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
832 | { |
833 | int ret; | |
834 | ||
835 | /* Setup semaphore */ | |
836 | sem_init(&kconsumerd_sem, 0, 0); | |
837 | ||
1d4b027a | 838 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
839 | if (ret != 0) { |
840 | perror("pthread_create kconsumerd"); | |
841 | goto error; | |
842 | } | |
843 | ||
693bd40b | 844 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
845 | sem_wait(&kconsumerd_sem); |
846 | ||
712ea556 DG |
847 | if (kconsumerd_pid == 0) { |
848 | ERR("Kconsumerd did not start"); | |
849 | goto error; | |
850 | } | |
851 | ||
8c0faa1d DG |
852 | return 0; |
853 | ||
854 | error: | |
712ea556 | 855 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
856 | return ret; |
857 | } | |
858 | ||
859 | /* | |
d063d709 | 860 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 861 | * |
d063d709 | 862 | * Return pid if successful else -1. |
8c0faa1d | 863 | */ |
693bd40b | 864 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
865 | { |
866 | int ret; | |
867 | pid_t pid; | |
53086306 | 868 | const char *verbosity; |
8c0faa1d | 869 | |
c49dc785 DG |
870 | DBG("Spawning kconsumerd"); |
871 | ||
8c0faa1d DG |
872 | pid = fork(); |
873 | if (pid == 0) { | |
874 | /* | |
875 | * Exec kconsumerd. | |
876 | */ | |
53086306 DG |
877 | if (opt_verbose > 1) { |
878 | verbosity = "--verbose"; | |
879 | } else { | |
880 | verbosity = "--quiet"; | |
881 | } | |
882 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
883 | if (errno != 0) { |
884 | perror("kernel start consumer exec"); | |
885 | } | |
886 | exit(EXIT_FAILURE); | |
887 | } else if (pid > 0) { | |
888 | ret = pid; | |
889 | goto error; | |
890 | } else { | |
891 | perror("kernel start consumer fork"); | |
892 | ret = -errno; | |
893 | goto error; | |
894 | } | |
895 | ||
896 | error: | |
897 | return ret; | |
898 | } | |
899 | ||
693bd40b | 900 | /* |
d063d709 | 901 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
902 | */ |
903 | static int start_kconsumerd(void) | |
904 | { | |
905 | int ret; | |
906 | ||
693bd40b | 907 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 908 | if (kconsumerd_pid != 0) { |
817153bb | 909 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
910 | goto end; |
911 | } | |
693bd40b | 912 | |
c49dc785 DG |
913 | ret = spawn_kconsumerd(); |
914 | if (ret < 0) { | |
915 | ERR("Spawning kconsumerd failed"); | |
916 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
917 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
918 | goto error; | |
693bd40b | 919 | } |
c49dc785 DG |
920 | |
921 | /* Setting up the global kconsumerd_pid */ | |
922 | kconsumerd_pid = ret; | |
693bd40b DG |
923 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
924 | ||
6f61d021 DG |
925 | DBG("Kconsumerd pid %d", ret); |
926 | ||
693bd40b | 927 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
928 | ret = spawn_kconsumerd_thread(); |
929 | if (ret < 0) { | |
930 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
931 | goto error; |
932 | } | |
933 | ||
c49dc785 | 934 | end: |
693bd40b DG |
935 | return 0; |
936 | ||
937 | error: | |
938 | return ret; | |
939 | } | |
940 | ||
b73401da | 941 | /* |
d063d709 | 942 | * modprobe_kernel_modules |
b73401da DG |
943 | */ |
944 | static int modprobe_kernel_modules(void) | |
945 | { | |
946 | int ret = 0, i = 0; | |
947 | char modprobe[256]; | |
948 | ||
949 | while (kernel_modules_list[i] != NULL) { | |
950 | ret = snprintf(modprobe, sizeof(modprobe), "/sbin/modprobe %s", | |
951 | kernel_modules_list[i]); | |
952 | if (ret < 0) { | |
953 | perror("snprintf modprobe"); | |
954 | goto error; | |
955 | } | |
956 | ret = system(modprobe); | |
957 | if (ret < 0) { | |
958 | ERR("Unable to load module %s", kernel_modules_list[i]); | |
959 | } | |
960 | DBG("Modprobe successfully %s", kernel_modules_list[i]); | |
961 | i++; | |
962 | } | |
963 | ||
964 | error: | |
965 | return ret; | |
966 | } | |
967 | ||
968 | /* | |
d063d709 | 969 | * mount_debugfs |
b73401da DG |
970 | */ |
971 | static int mount_debugfs(char *path) | |
972 | { | |
973 | int ret; | |
974 | char *type = "debugfs"; | |
975 | ||
976 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG); | |
977 | if (ret < 0) { | |
978 | goto error; | |
979 | } | |
980 | ||
981 | ret = mount(type, path, type, 0, NULL); | |
982 | if (ret < 0) { | |
983 | perror("mount debugfs"); | |
984 | goto error; | |
985 | } | |
986 | ||
987 | DBG("Mounted debugfs successfully at %s", path); | |
988 | ||
989 | error: | |
990 | return ret; | |
991 | } | |
992 | ||
8c0faa1d | 993 | /* |
d063d709 | 994 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 995 | */ |
f3ed775e | 996 | static void init_kernel_tracer(void) |
8c0faa1d | 997 | { |
b73401da DG |
998 | int ret; |
999 | char *proc_mounts = "/proc/mounts"; | |
1000 | char line[256]; | |
1001 | char *debugfs_path = NULL, *lttng_path; | |
1002 | FILE *fp; | |
1003 | ||
1004 | /* Detect debugfs */ | |
1005 | fp = fopen(proc_mounts, "r"); | |
1006 | if (fp == NULL) { | |
1007 | ERR("Unable to probe %s", proc_mounts); | |
1008 | goto error; | |
1009 | } | |
1010 | ||
1011 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1012 | if (strstr(line, "debugfs") != NULL) { | |
1013 | /* Remove first string */ | |
1014 | strtok(line, " "); | |
1015 | /* Dup string here so we can reuse line later on */ | |
1016 | debugfs_path = strdup(strtok(NULL, " ")); | |
1017 | DBG("Got debugfs path : %s", debugfs_path); | |
1018 | break; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | fclose(fp); | |
1023 | ||
1024 | /* Mount debugfs if needded */ | |
1025 | if (debugfs_path == NULL) { | |
1026 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1027 | if (ret < 0) { | |
1028 | perror("asprintf debugfs path"); | |
1029 | goto error; | |
1030 | } | |
1031 | ret = mount_debugfs(debugfs_path); | |
1032 | if (ret < 0) { | |
1033 | goto error; | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | /* Modprobe lttng kernel modules */ | |
1038 | ret = modprobe_kernel_modules(); | |
1039 | if (ret < 0) { | |
1040 | goto error; | |
1041 | } | |
1042 | ||
1043 | /* Setup lttng kernel path */ | |
1044 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1045 | if (ret < 0) { | |
1046 | perror("asprintf lttng path"); | |
1047 | goto error; | |
1048 | } | |
1049 | ||
1050 | /* Open debugfs lttng */ | |
1051 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1052 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1053 | DBG("Failed to open %s", lttng_path); |
1054 | goto error; | |
8c0faa1d DG |
1055 | } |
1056 | ||
b73401da DG |
1057 | free(lttng_path); |
1058 | free(debugfs_path); | |
f3ed775e | 1059 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1060 | return; |
1061 | ||
1062 | error: | |
1063 | if (lttng_path) { | |
1064 | free(lttng_path); | |
1065 | } | |
1066 | if (debugfs_path) { | |
1067 | free(debugfs_path); | |
1068 | } | |
1069 | WARN("No kernel tracer available"); | |
1070 | kernel_tracer_fd = 0; | |
1071 | return; | |
f3ed775e | 1072 | } |
33a2b854 | 1073 | |
f3ed775e | 1074 | /* |
d063d709 DG |
1075 | * Start tracing by creating trace directory and sending FDs to the kernel |
1076 | * consumer. | |
f3ed775e DG |
1077 | */ |
1078 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1079 | { | |
f40799e8 | 1080 | int ret = 0; |
8c0faa1d | 1081 | |
f3ed775e DG |
1082 | if (session->kconsumer_fds_sent == 0) { |
1083 | ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session); | |
1084 | if (ret < 0) { | |
1085 | ERR("Send kconsumerd fds failed"); | |
1086 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1087 | goto error; | |
1088 | } | |
1d4b027a | 1089 | |
f3ed775e DG |
1090 | session->kconsumer_fds_sent = 1; |
1091 | } | |
1d4b027a DG |
1092 | |
1093 | error: | |
1094 | return ret; | |
8c0faa1d DG |
1095 | } |
1096 | ||
7a485870 DG |
1097 | /* |
1098 | * Notify kernel thread to update it's pollfd. | |
1099 | */ | |
1100 | static int notify_kernel_pollfd(void) | |
1101 | { | |
1102 | int ret; | |
1103 | ||
1104 | /* Inform kernel thread of the new kernel channel */ | |
1105 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1106 | if (ret < 0) { | |
1107 | perror("write kernel poll pipe"); | |
1108 | } | |
1109 | ||
1110 | return ret; | |
1111 | } | |
1112 | ||
8c0faa1d | 1113 | /* |
d063d709 | 1114 | * Allocate a channel structure and fill it. |
8c0faa1d | 1115 | */ |
f3ed775e | 1116 | static struct lttng_channel *init_default_channel(void) |
8c0faa1d | 1117 | { |
f3ed775e | 1118 | struct lttng_channel *chan; |
1d4b027a | 1119 | |
f3ed775e DG |
1120 | chan = malloc(sizeof(struct lttng_channel)); |
1121 | if (chan == NULL) { | |
1122 | perror("init channel malloc"); | |
1123 | goto error; | |
8c0faa1d | 1124 | } |
1d4b027a | 1125 | |
f3ed775e DG |
1126 | if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) { |
1127 | perror("snprintf defautl channel name"); | |
1128 | return NULL; | |
1129 | } | |
1130 | ||
1131 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1132 | chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; | |
1133 | chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; | |
1134 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
1135 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 1136 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
1d4b027a DG |
1137 | |
1138 | error: | |
f3ed775e | 1139 | return chan; |
8c0faa1d DG |
1140 | } |
1141 | ||
333f285e | 1142 | /* |
d063d709 | 1143 | * Create a kernel tracer session then create the default channel. |
333f285e | 1144 | */ |
f3ed775e | 1145 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1146 | { |
f3ed775e | 1147 | int ret; |
f3ed775e DG |
1148 | |
1149 | DBG("Creating kernel session"); | |
1150 | ||
1151 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1152 | if (ret < 0) { | |
1153 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1154 | goto error; | |
333f285e DG |
1155 | } |
1156 | ||
7a485870 DG |
1157 | ret = mkdir_recursive(session->path, S_IRWXU | S_IRWXG ); |
1158 | if (ret < 0) { | |
1159 | if (ret != EEXIST) { | |
1160 | ERR("Trace directory creation error"); | |
1161 | goto error; | |
1162 | } | |
1163 | } | |
1164 | ||
f3ed775e DG |
1165 | error: |
1166 | return ret; | |
333f285e DG |
1167 | } |
1168 | ||
6c9cc2ab DG |
1169 | /* |
1170 | * Using the session list, filled a lttng_session array to send back to the | |
1171 | * client for session listing. | |
1172 | * | |
1173 | * The session list lock MUST be acquired before calling this function. Use | |
1174 | * lock_session_list() and unlock_session_list(). | |
1175 | */ | |
1176 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1177 | { | |
1178 | int i = 0; | |
1179 | struct ltt_session *session; | |
1180 | ||
1181 | DBG("Getting all available session"); | |
1182 | /* | |
1183 | * Iterate over session list and append data after the control struct in | |
1184 | * the buffer. | |
1185 | */ | |
1186 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1187 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
1188 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
1189 | i++; | |
1190 | } | |
1191 | } | |
1192 | ||
fac6795d | 1193 | /* |
d063d709 DG |
1194 | * Process the command requested by the lttng client within the command |
1195 | * context structure. This function make sure that the return structure (llm) | |
1196 | * is set and ready for transmission before returning. | |
fac6795d | 1197 | * |
e065084a | 1198 | * Return any error encountered or 0 for success. |
fac6795d | 1199 | */ |
5461b305 | 1200 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1201 | { |
f40799e8 | 1202 | int ret = LTTCOMM_OK; |
fac6795d | 1203 | |
5461b305 | 1204 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1205 | |
f3ed775e | 1206 | /* Listing commands don't need a session */ |
5461b305 | 1207 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1208 | case LTTNG_CREATE_SESSION: |
1209 | case LTTNG_LIST_SESSIONS: | |
f3ed775e DG |
1210 | case LTTNG_LIST_EVENTS: |
1211 | case LTTNG_KERNEL_LIST_EVENTS: | |
1212 | case LTTNG_LIST_TRACEABLE_APPS: | |
5e16da05 MD |
1213 | break; |
1214 | default: | |
f3ed775e DG |
1215 | DBG("Getting session %s by name", cmd_ctx->lsm->session_name); |
1216 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name); | |
5461b305 | 1217 | if (cmd_ctx->session == NULL) { |
f3ed775e DG |
1218 | /* If session name not found */ |
1219 | if (cmd_ctx->lsm->session_name != NULL) { | |
1220 | ret = LTTCOMM_SESS_NOT_FOUND; | |
1221 | } else { /* If no session name specified */ | |
1222 | ret = LTTCOMM_SELECT_SESS; | |
1223 | } | |
5461b305 | 1224 | goto error; |
b5541356 DG |
1225 | } else { |
1226 | /* Acquire lock for the session */ | |
1227 | lock_session(cmd_ctx->session); | |
379473d2 | 1228 | } |
5e16da05 | 1229 | break; |
379473d2 DG |
1230 | } |
1231 | ||
f3ed775e DG |
1232 | /* |
1233 | * Check kernel command for kernel session. | |
1234 | */ | |
20fe2104 | 1235 | switch (cmd_ctx->lsm->cmd_type) { |
d65106b1 | 1236 | case LTTNG_KERNEL_ADD_CONTEXT: |
f3ed775e DG |
1237 | case LTTNG_KERNEL_DISABLE_ALL_EVENT: |
1238 | case LTTNG_KERNEL_DISABLE_CHANNEL: | |
1239 | case LTTNG_KERNEL_DISABLE_EVENT: | |
1240 | case LTTNG_KERNEL_ENABLE_ALL_EVENT: | |
1241 | case LTTNG_KERNEL_ENABLE_CHANNEL: | |
1242 | case LTTNG_KERNEL_ENABLE_EVENT: | |
1243 | case LTTNG_KERNEL_LIST_EVENTS: | |
333f285e | 1244 | /* Kernel tracer check */ |
20fe2104 | 1245 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1246 | init_kernel_tracer(); |
1247 | if (kernel_tracer_fd == 0) { | |
1248 | ret = LTTCOMM_KERN_NA; | |
1249 | goto error; | |
1250 | } | |
20fe2104 | 1251 | } |
f3ed775e DG |
1252 | |
1253 | /* Need a session for kernel command */ | |
1254 | if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS && | |
1255 | cmd_ctx->session->kernel_session == NULL) { | |
7b395890 | 1256 | |
f3ed775e DG |
1257 | ret = create_kernel_session(cmd_ctx->session); |
1258 | if (ret < 0) { | |
1259 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1260 | goto error; | |
1261 | } | |
1262 | ||
7b395890 | 1263 | /* Start the kernel consumer daemon */ |
f3ed775e DG |
1264 | if (kconsumerd_pid == 0) { |
1265 | ret = start_kconsumerd(); | |
1266 | if (ret < 0) { | |
1267 | goto error; | |
1268 | } | |
1269 | } | |
1270 | } | |
20fe2104 DG |
1271 | } |
1272 | ||
97b1a726 | 1273 | #ifdef DISABLED |
471d1693 | 1274 | /* Connect to ust apps if available pid */ |
5461b305 | 1275 | if (cmd_ctx->lsm->pid > 0) { |
471d1693 | 1276 | /* Connect to app using ustctl API */ |
5461b305 DG |
1277 | cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid); |
1278 | if (cmd_ctx->ust_sock < 0) { | |
471d1693 | 1279 | ret = LTTCOMM_NO_TRACEABLE; |
5461b305 | 1280 | goto error; |
471d1693 DG |
1281 | } |
1282 | } | |
97b1a726 | 1283 | #endif /* DISABLED */ |
471d1693 | 1284 | |
fac6795d | 1285 | /* Process by command type */ |
5461b305 | 1286 | switch (cmd_ctx->lsm->cmd_type) { |
d65106b1 DG |
1287 | case LTTNG_KERNEL_ADD_CONTEXT: |
1288 | { | |
1289 | int found = 0, no_event = 0; | |
1290 | struct ltt_kernel_channel *chan; | |
1291 | struct ltt_kernel_event *event; | |
7d29a247 | 1292 | struct lttng_kernel_context ctx; |
d65106b1 DG |
1293 | |
1294 | /* Setup lttng message with no payload */ | |
1295 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1296 | if (ret < 0) { | |
1297 | goto setup_error; | |
1298 | } | |
1299 | ||
1300 | /* Check if event name is given */ | |
1301 | if (strlen(cmd_ctx->lsm->u.context.event_name) == 0) { | |
1302 | no_event = 1; | |
1303 | } | |
1304 | ||
7d29a247 DG |
1305 | /* Create Kernel context */ |
1306 | ctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1307 | ctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1308 | ctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1309 | strncpy(ctx.u.perf_counter.name, | |
1310 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1311 | sizeof(ctx.u.perf_counter.name)); | |
1312 | ||
d65106b1 DG |
1313 | if (strlen(cmd_ctx->lsm->u.context.channel_name) == 0) { |
1314 | /* Go over all channels */ | |
1315 | DBG("Adding context to all channels"); | |
1316 | cds_list_for_each_entry(chan, | |
1317 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
1318 | if (no_event) { | |
7d29a247 | 1319 | ret = kernel_add_channel_context(chan, &ctx); |
d65106b1 DG |
1320 | if (ret < 0) { |
1321 | continue; | |
1322 | } | |
1323 | } else { | |
1324 | event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan); | |
1325 | if (event != NULL) { | |
7d29a247 | 1326 | ret = kernel_add_event_context(event, &ctx); |
d65106b1 DG |
1327 | if (ret < 0) { |
1328 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
1329 | goto error; | |
1330 | } | |
1331 | found = 1; | |
1332 | break; | |
1333 | } | |
1334 | } | |
1335 | } | |
1336 | } else { | |
1337 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.context.channel_name, | |
1338 | cmd_ctx->session->kernel_session); | |
1339 | if (chan == NULL) { | |
1340 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1341 | goto error; | |
1342 | } | |
1343 | ||
1344 | if (no_event) { | |
7d29a247 | 1345 | ret = kernel_add_channel_context(chan, &ctx); |
d65106b1 DG |
1346 | if (ret < 0) { |
1347 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
1348 | goto error; | |
1349 | } | |
1350 | } else { | |
1351 | event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan); | |
1352 | if (event != NULL) { | |
7d29a247 | 1353 | ret = kernel_add_event_context(event, &ctx); |
d65106b1 DG |
1354 | if (ret < 0) { |
1355 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
1356 | goto error; | |
1357 | } | |
1358 | } | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | if (!found && !no_event) { | |
1363 | ret = LTTCOMM_NO_EVENT; | |
1364 | goto error; | |
1365 | } | |
1366 | ||
1367 | ret = LTTCOMM_OK; | |
1368 | break; | |
1369 | } | |
26cc6b4e DG |
1370 | case LTTNG_KERNEL_DISABLE_CHANNEL: |
1371 | { | |
1372 | struct ltt_kernel_channel *chan; | |
1373 | ||
1374 | /* Setup lttng message with no payload */ | |
1375 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1376 | if (ret < 0) { | |
1377 | goto setup_error; | |
1378 | } | |
1379 | ||
1380 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1381 | cmd_ctx->session->kernel_session); | |
1382 | if (chan == NULL) { | |
1383 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1384 | goto error; | |
1385 | } else if (chan->enabled == 1) { | |
1386 | ret = kernel_disable_channel(chan); | |
1387 | if (ret < 0) { | |
1388 | if (ret != EEXIST) { | |
1389 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1390 | } | |
1391 | goto error; | |
1392 | } | |
1393 | } | |
1394 | ||
1395 | kernel_wait_quiescent(kernel_tracer_fd); | |
1396 | ret = LTTCOMM_OK; | |
1397 | break; | |
1398 | } | |
e953ef25 DG |
1399 | case LTTNG_KERNEL_DISABLE_EVENT: |
1400 | { | |
e953ef25 | 1401 | struct ltt_kernel_channel *chan; |
19e70852 | 1402 | struct ltt_kernel_event *ev; |
e953ef25 DG |
1403 | |
1404 | /* Setup lttng message with no payload */ | |
1405 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1406 | if (ret < 0) { | |
1407 | goto setup_error; | |
1408 | } | |
1409 | ||
19e70852 DG |
1410 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
1411 | cmd_ctx->session->kernel_session); | |
1412 | if (chan == NULL) { | |
1413 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1414 | goto error; | |
1415 | } | |
e953ef25 | 1416 | |
19e70852 DG |
1417 | ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan); |
1418 | if (ev != NULL) { | |
1419 | DBG("Disabling kernel event %s for channel %s.", | |
1420 | cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name); | |
1421 | ret = kernel_disable_event(ev); | |
1422 | if (ret < 0) { | |
1423 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1424 | goto error; | |
e953ef25 DG |
1425 | } |
1426 | } | |
1427 | ||
19e70852 DG |
1428 | kernel_wait_quiescent(kernel_tracer_fd); |
1429 | ret = LTTCOMM_OK; | |
e953ef25 DG |
1430 | break; |
1431 | } | |
950131af DG |
1432 | case LTTNG_KERNEL_DISABLE_ALL_EVENT: |
1433 | { | |
1434 | struct ltt_kernel_channel *chan; | |
1435 | struct ltt_kernel_event *ev; | |
1436 | ||
1437 | /* Setup lttng message with no payload */ | |
1438 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1439 | if (ret < 0) { | |
1440 | goto setup_error; | |
1441 | } | |
1442 | ||
1443 | DBG("Disabling all enabled kernel events"); | |
1444 | ||
1445 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1446 | cmd_ctx->session->kernel_session); | |
1447 | if (chan == NULL) { | |
1448 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1449 | goto error; | |
1450 | } | |
1451 | ||
1452 | /* For each event in the kernel session */ | |
1453 | cds_list_for_each_entry(ev, &chan->events_list.head, list) { | |
1454 | DBG("Disabling kernel event %s for channel %s.", | |
1455 | ev->event->name, cmd_ctx->lsm->u.disable.channel_name); | |
1456 | ret = kernel_disable_event(ev); | |
1457 | if (ret < 0) { | |
1458 | continue; | |
1459 | } | |
1460 | } | |
1461 | ||
1462 | /* Quiescent wait after event disable */ | |
1463 | kernel_wait_quiescent(kernel_tracer_fd); | |
1464 | ret = LTTCOMM_OK; | |
1465 | break; | |
1466 | } | |
d36b8583 DG |
1467 | case LTTNG_KERNEL_ENABLE_CHANNEL: |
1468 | { | |
1469 | struct ltt_kernel_channel *chan; | |
1470 | ||
1471 | /* Setup lttng message with no payload */ | |
1472 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1473 | if (ret < 0) { | |
1474 | goto setup_error; | |
1475 | } | |
1476 | ||
1477 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, | |
1478 | cmd_ctx->session->kernel_session); | |
1479 | if (chan == NULL) { | |
7d29a247 DG |
1480 | /* Channel not found, creating it */ |
1481 | DBG("Creating kernel channel"); | |
1482 | ||
1483 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
1484 | &cmd_ctx->lsm->u.channel.chan, cmd_ctx->session->path); | |
1485 | if (ret < 0) { | |
1486 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1487 | goto error; | |
1488 | } | |
1489 | ||
1490 | /* Notify kernel thread that there is a new channel */ | |
1491 | ret = notify_kernel_pollfd(); | |
1492 | if (ret < 0) { | |
1493 | ret = LTTCOMM_FATAL; | |
1494 | goto error; | |
1495 | } | |
d36b8583 DG |
1496 | } else if (chan->enabled == 0) { |
1497 | ret = kernel_enable_channel(chan); | |
1498 | if (ret < 0) { | |
1499 | if (ret != EEXIST) { | |
1500 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
1501 | } | |
1502 | goto error; | |
1503 | } | |
1504 | } | |
1505 | ||
1506 | kernel_wait_quiescent(kernel_tracer_fd); | |
1507 | ret = LTTCOMM_OK; | |
1508 | break; | |
1509 | } | |
f3ed775e | 1510 | case LTTNG_KERNEL_ENABLE_EVENT: |
894be886 | 1511 | { |
7d29a247 DG |
1512 | char *channel_name; |
1513 | struct ltt_kernel_channel *kchan; | |
19e70852 | 1514 | struct ltt_kernel_event *ev; |
7d29a247 | 1515 | struct lttng_channel *chan; |
f3ed775e | 1516 | |
894be886 DG |
1517 | /* Setup lttng message with no payload */ |
1518 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1519 | if (ret < 0) { | |
1520 | goto setup_error; | |
1521 | } | |
1522 | ||
7d29a247 DG |
1523 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1524 | ||
1525 | do { | |
1526 | kchan = get_kernel_channel_by_name(channel_name, | |
1527 | cmd_ctx->session->kernel_session); | |
1528 | if (kchan == NULL) { | |
1529 | DBG("Creating default channel"); | |
1530 | ||
1531 | chan = init_default_channel(); | |
1532 | if (chan == NULL) { | |
1533 | ret = LTTCOMM_FATAL; | |
1534 | goto error; | |
1535 | } | |
1536 | ||
1537 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
1538 | chan, cmd_ctx->session->path); | |
1539 | if (ret < 0) { | |
1540 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1541 | goto error; | |
1542 | } | |
1543 | } | |
1544 | } while (kchan == NULL); | |
f34daff7 | 1545 | |
7d29a247 | 1546 | ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
19e70852 DG |
1547 | if (ev == NULL) { |
1548 | DBG("Creating kernel event %s for channel %s.", | |
7d29a247 DG |
1549 | cmd_ctx->lsm->u.enable.event.name, channel_name); |
1550 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
f3ed775e | 1551 | } else { |
19e70852 | 1552 | DBG("Enabling kernel event %s for channel %s.", |
7d29a247 | 1553 | cmd_ctx->lsm->u.enable.event.name, channel_name); |
19e70852 | 1554 | ret = kernel_enable_event(ev); |
7d29a247 DG |
1555 | if (ret == -EEXIST) { |
1556 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
1557 | goto error; | |
1558 | } | |
19e70852 DG |
1559 | } |
1560 | ||
1561 | if (ret < 0) { | |
1562 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1563 | goto error; | |
f3ed775e | 1564 | } |
19e70852 DG |
1565 | |
1566 | kernel_wait_quiescent(kernel_tracer_fd); | |
1567 | ret = LTTCOMM_OK; | |
894be886 DG |
1568 | break; |
1569 | } | |
f3ed775e | 1570 | case LTTNG_KERNEL_ENABLE_ALL_EVENT: |
33a2b854 | 1571 | { |
950131af | 1572 | int pos, size; |
7d29a247 DG |
1573 | char *event_list, *event, *ptr, *channel_name; |
1574 | struct ltt_kernel_channel *kchan; | |
950131af DG |
1575 | struct ltt_kernel_event *ev; |
1576 | struct lttng_event ev_attr; | |
7d29a247 | 1577 | struct lttng_channel *chan; |
33a2b854 DG |
1578 | |
1579 | /* Setup lttng message with no payload */ | |
1580 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1581 | if (ret < 0) { | |
1582 | goto setup_error; | |
1583 | } | |
1584 | ||
1585 | DBG("Enabling all kernel event"); | |
1586 | ||
7d29a247 DG |
1587 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1588 | ||
1589 | do { | |
1590 | kchan = get_kernel_channel_by_name(channel_name, | |
1591 | cmd_ctx->session->kernel_session); | |
1592 | if (kchan == NULL) { | |
1593 | DBG("Creating default channel"); | |
1594 | ||
1595 | chan = init_default_channel(); | |
1596 | if (chan == NULL) { | |
1597 | ret = LTTCOMM_FATAL; | |
1598 | goto error; | |
1599 | } | |
1600 | ||
1601 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
0c11f72b | 1602 | chan, cmd_ctx->session->path); |
7d29a247 DG |
1603 | if (ret < 0) { |
1604 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1605 | goto error; | |
1606 | } | |
1607 | } | |
1608 | } while (kchan == NULL); | |
33a2b854 | 1609 | |
950131af | 1610 | /* For each event in the kernel session */ |
7d29a247 | 1611 | cds_list_for_each_entry(ev, &kchan->events_list.head, list) { |
950131af | 1612 | DBG("Enabling kernel event %s for channel %s.", |
7d29a247 | 1613 | ev->event->name, channel_name); |
950131af DG |
1614 | ret = kernel_enable_event(ev); |
1615 | if (ret < 0) { | |
1616 | continue; | |
f3ed775e DG |
1617 | } |
1618 | } | |
1619 | ||
950131af DG |
1620 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
1621 | if (size < 0) { | |
1622 | ret = LTTCOMM_KERN_LIST_FAIL; | |
f3ed775e DG |
1623 | goto error; |
1624 | } | |
1625 | ||
33a2b854 DG |
1626 | ptr = event_list; |
1627 | while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { | |
7d29a247 | 1628 | ev = get_kernel_event_by_name(event, kchan); |
950131af DG |
1629 | if (ev == NULL) { |
1630 | strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN); | |
1631 | /* Default event type for enable all */ | |
e6ddca71 | 1632 | ev_attr.type = LTTNG_EVENT_TRACEPOINT; |
950131af | 1633 | /* Enable each single tracepoint event */ |
7d29a247 | 1634 | ret = kernel_create_event(&ev_attr, kchan); |
950131af DG |
1635 | if (ret < 0) { |
1636 | /* Ignore error here and continue */ | |
950131af | 1637 | } |
33a2b854 | 1638 | } |
950131af | 1639 | |
33a2b854 DG |
1640 | /* Move pointer to the next line */ |
1641 | ptr += pos + 1; | |
1642 | free(event); | |
1643 | } | |
1644 | ||
1645 | free(event_list); | |
1646 | ||
f3ed775e DG |
1647 | /* Quiescent wait after event enable */ |
1648 | kernel_wait_quiescent(kernel_tracer_fd); | |
33a2b854 DG |
1649 | ret = LTTCOMM_OK; |
1650 | break; | |
1651 | } | |
f3ed775e | 1652 | case LTTNG_KERNEL_LIST_EVENTS: |
2ef84c95 DG |
1653 | { |
1654 | char *event_list; | |
f3ed775e DG |
1655 | ssize_t size = 0; |
1656 | ||
1657 | DBG("Listing kernel events"); | |
2ef84c95 DG |
1658 | |
1659 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
1660 | if (size < 0) { | |
1661 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1662 | goto error; | |
1663 | } | |
1664 | ||
1665 | /* | |
1666 | * Setup lttng message with payload size set to the event list size in | |
1667 | * bytes and then copy list into the llm payload. | |
1668 | */ | |
1669 | ret = setup_lttng_msg(cmd_ctx, size); | |
1670 | if (ret < 0) { | |
1671 | goto setup_error; | |
1672 | } | |
1673 | ||
1674 | /* Copy event list into message payload */ | |
1675 | memcpy(cmd_ctx->llm->payload, event_list, size); | |
1676 | ||
1677 | free(event_list); | |
1678 | ||
1679 | ret = LTTCOMM_OK; | |
1680 | break; | |
1681 | } | |
f3ed775e | 1682 | case LTTNG_START_TRACE: |
8c0faa1d DG |
1683 | { |
1684 | struct ltt_kernel_channel *chan; | |
f3ed775e | 1685 | |
8c0faa1d DG |
1686 | /* Setup lttng message with no payload */ |
1687 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1688 | if (ret < 0) { | |
1689 | goto setup_error; | |
1690 | } | |
1691 | ||
f3ed775e DG |
1692 | /* Kernel tracing */ |
1693 | if (cmd_ctx->session->kernel_session != NULL) { | |
1694 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
1695 | DBG("Open kernel metadata"); | |
58a97671 DG |
1696 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
1697 | cmd_ctx->session->path); | |
f3ed775e DG |
1698 | if (ret < 0) { |
1699 | ret = LTTCOMM_KERN_META_FAIL; | |
1700 | goto error; | |
1701 | } | |
1702 | } | |
8c0faa1d | 1703 | |
f3ed775e DG |
1704 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
1705 | DBG("Opening kernel metadata stream"); | |
1706 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
1707 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
1708 | if (ret < 0) { | |
1709 | ERR("Kernel create metadata stream failed"); | |
1710 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1711 | goto error; | |
1712 | } | |
1713 | } | |
1714 | } | |
8c0faa1d | 1715 | |
f3ed775e DG |
1716 | /* For each channel */ |
1717 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
1718 | if (chan->stream_count == 0) { | |
1719 | ret = kernel_open_channel_stream(chan); | |
1720 | if (ret < 0) { | |
1721 | ERR("Kernel create channel stream failed"); | |
1722 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1723 | goto error; | |
1724 | } | |
1725 | /* Update the stream global counter */ | |
1726 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
1727 | } | |
1728 | } | |
1729 | ||
1730 | DBG("Start kernel tracing"); | |
1731 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
8c0faa1d | 1732 | if (ret < 0) { |
f3ed775e DG |
1733 | ERR("Kernel start session failed"); |
1734 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1735 | goto error; |
1736 | } | |
8c0faa1d | 1737 | |
f3ed775e DG |
1738 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
1739 | if (ret < 0) { | |
1740 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1741 | goto error; |
1742 | } | |
8c0faa1d | 1743 | |
f3ed775e DG |
1744 | /* Quiescent wait after starting trace */ |
1745 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1746 | } |
1747 | ||
f3ed775e | 1748 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
1749 | |
1750 | ret = LTTCOMM_OK; | |
1751 | break; | |
1752 | } | |
f3ed775e | 1753 | case LTTNG_STOP_TRACE: |
8c0faa1d | 1754 | { |
f3ed775e | 1755 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
1756 | /* Setup lttng message with no payload */ |
1757 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1758 | if (ret < 0) { | |
1759 | goto setup_error; | |
1760 | } | |
1761 | ||
f3ed775e DG |
1762 | /* Kernel tracer */ |
1763 | if (cmd_ctx->session->kernel_session != NULL) { | |
1764 | DBG("Stop kernel tracing"); | |
84291629 | 1765 | |
f3ed775e DG |
1766 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
1767 | if (ret < 0) { | |
1768 | ERR("Kernel metadata flush failed"); | |
1769 | } | |
8c0faa1d | 1770 | |
f3ed775e DG |
1771 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
1772 | ret = kernel_flush_buffer(chan); | |
1773 | if (ret < 0) { | |
1774 | ERR("Kernel flush buffer error"); | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
1779 | if (ret < 0) { | |
1780 | ERR("Kernel stop session failed"); | |
1781 | ret = LTTCOMM_KERN_STOP_FAIL; | |
1782 | goto error; | |
1783 | } | |
1784 | ||
1785 | /* Quiescent wait after stopping trace */ | |
1786 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1787 | } |
1788 | ||
f3ed775e | 1789 | /* TODO : User-space tracer */ |
8c0faa1d DG |
1790 | |
1791 | ret = LTTCOMM_OK; | |
1792 | break; | |
1793 | } | |
5e16da05 MD |
1794 | case LTTNG_CREATE_SESSION: |
1795 | { | |
5461b305 DG |
1796 | /* Setup lttng message with no payload */ |
1797 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1798 | if (ret < 0) { | |
1799 | goto setup_error; | |
1800 | } | |
1801 | ||
f3ed775e | 1802 | ret = create_session(cmd_ctx->lsm->session_name, cmd_ctx->lsm->path); |
5e16da05 | 1803 | if (ret < 0) { |
f3ed775e | 1804 | if (ret == -EEXIST) { |
5e16da05 MD |
1805 | ret = LTTCOMM_EXIST_SESS; |
1806 | } else { | |
aaf97519 | 1807 | ret = LTTCOMM_FATAL; |
aaf97519 | 1808 | } |
5461b305 | 1809 | goto error; |
8028d920 | 1810 | } |
1657e9bb | 1811 | |
5461b305 | 1812 | ret = LTTCOMM_OK; |
5e16da05 MD |
1813 | break; |
1814 | } | |
1815 | case LTTNG_DESTROY_SESSION: | |
1816 | { | |
5461b305 DG |
1817 | /* Setup lttng message with no payload */ |
1818 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1819 | if (ret < 0) { | |
1820 | goto setup_error; | |
1821 | } | |
1822 | ||
f3ed775e DG |
1823 | /* Clean kernel session teardown */ |
1824 | teardown_kernel_session(cmd_ctx->session); | |
1825 | ||
1826 | ret = destroy_session(cmd_ctx->lsm->session_name); | |
5e16da05 | 1827 | if (ret < 0) { |
f3ed775e | 1828 | ret = LTTCOMM_FATAL; |
5461b305 | 1829 | goto error; |
5e16da05 | 1830 | } |
1657e9bb | 1831 | |
7a485870 DG |
1832 | /* |
1833 | * Must notify the kernel thread here to update it's pollfd in order to | |
1834 | * remove the channel(s)' fd just destroyed. | |
1835 | */ | |
1836 | ret = notify_kernel_pollfd(); | |
1837 | if (ret < 0) { | |
1838 | ret = LTTCOMM_FATAL; | |
1839 | goto error; | |
1840 | } | |
1841 | ||
5461b305 DG |
1842 | ret = LTTCOMM_OK; |
1843 | break; | |
5e16da05 | 1844 | } |
f3ed775e | 1845 | /* |
5e16da05 MD |
1846 | case LTTNG_LIST_TRACES: |
1847 | { | |
5461b305 | 1848 | unsigned int trace_count; |
1657e9bb | 1849 | |
5461b305 | 1850 | trace_count = get_trace_count_per_session(cmd_ctx->session); |
5e16da05 MD |
1851 | if (trace_count == 0) { |
1852 | ret = LTTCOMM_NO_TRACE; | |
5461b305 | 1853 | goto error; |
1657e9bb | 1854 | } |
df0da139 | 1855 | |
5461b305 DG |
1856 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count); |
1857 | if (ret < 0) { | |
1858 | goto setup_error; | |
df0da139 | 1859 | } |
ca95a216 | 1860 | |
5461b305 DG |
1861 | get_traces_per_session(cmd_ctx->session, |
1862 | (struct lttng_trace *)(cmd_ctx->llm->payload)); | |
1863 | ||
1864 | ret = LTTCOMM_OK; | |
5e16da05 MD |
1865 | break; |
1866 | } | |
f3ed775e DG |
1867 | */ |
1868 | /* | |
5e16da05 MD |
1869 | case UST_CREATE_TRACE: |
1870 | { | |
5461b305 | 1871 | ret = setup_lttng_msg(cmd_ctx, 0); |
5e16da05 | 1872 | if (ret < 0) { |
5461b305 | 1873 | goto setup_error; |
fac6795d | 1874 | } |
ce3d728c | 1875 | |
5461b305 DG |
1876 | ret = ust_create_trace(cmd_ctx); |
1877 | if (ret < 0) { | |
f3ed775e | 1878 | goto error; |
5461b305 DG |
1879 | } |
1880 | break; | |
5e16da05 | 1881 | } |
f3ed775e DG |
1882 | */ |
1883 | case LTTNG_LIST_TRACEABLE_APPS: | |
5e16da05 | 1884 | { |
5461b305 DG |
1885 | unsigned int app_count; |
1886 | ||
1887 | app_count = get_app_count(); | |
1888 | DBG("Traceable application count : %d", app_count); | |
5e16da05 MD |
1889 | if (app_count == 0) { |
1890 | ret = LTTCOMM_NO_APPS; | |
5461b305 | 1891 | goto error; |
ce3d728c | 1892 | } |
520ff687 | 1893 | |
5461b305 DG |
1894 | ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count); |
1895 | if (ret < 0) { | |
1896 | goto setup_error; | |
520ff687 | 1897 | } |
57167058 | 1898 | |
5461b305 | 1899 | get_app_list_pids((pid_t *)(cmd_ctx->llm->payload)); |
5e16da05 | 1900 | |
5461b305 | 1901 | ret = LTTCOMM_OK; |
5e16da05 MD |
1902 | break; |
1903 | } | |
f3ed775e | 1904 | /* |
5e16da05 MD |
1905 | case UST_START_TRACE: |
1906 | { | |
5461b305 DG |
1907 | ret = setup_lttng_msg(cmd_ctx, 0); |
1908 | if (ret < 0) { | |
1909 | goto setup_error; | |
1910 | } | |
ca95a216 | 1911 | |
5461b305 DG |
1912 | ret = ust_start_trace(cmd_ctx); |
1913 | if (ret < 0) { | |
1914 | goto setup_error; | |
1915 | } | |
1916 | break; | |
5e16da05 MD |
1917 | } |
1918 | case UST_STOP_TRACE: | |
1919 | { | |
5461b305 DG |
1920 | ret = setup_lttng_msg(cmd_ctx, 0); |
1921 | if (ret < 0) { | |
1922 | goto setup_error; | |
1923 | } | |
ca95a216 | 1924 | |
5461b305 DG |
1925 | ret = ust_stop_trace(cmd_ctx); |
1926 | if (ret < 0) { | |
1927 | goto setup_error; | |
1928 | } | |
1929 | break; | |
5e16da05 | 1930 | } |
f3ed775e | 1931 | */ |
5e16da05 MD |
1932 | case LTTNG_LIST_SESSIONS: |
1933 | { | |
6c9cc2ab | 1934 | lock_session_list(); |
5461b305 | 1935 | |
6c9cc2ab | 1936 | if (session_list_ptr->count == 0) { |
f3ed775e | 1937 | ret = LTTCOMM_NO_SESSION; |
5461b305 | 1938 | goto error; |
57167058 | 1939 | } |
5e16da05 | 1940 | |
6c9cc2ab DG |
1941 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
1942 | session_list_ptr->count); | |
5461b305 DG |
1943 | if (ret < 0) { |
1944 | goto setup_error; | |
e065084a | 1945 | } |
5e16da05 | 1946 | |
6c9cc2ab DG |
1947 | /* Filled the session array */ |
1948 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
1949 | ||
1950 | unlock_session_list(); | |
5e16da05 | 1951 | |
5461b305 | 1952 | ret = LTTCOMM_OK; |
5e16da05 MD |
1953 | break; |
1954 | } | |
1955 | default: | |
1956 | /* Undefined command */ | |
5461b305 DG |
1957 | ret = setup_lttng_msg(cmd_ctx, 0); |
1958 | if (ret < 0) { | |
1959 | goto setup_error; | |
1960 | } | |
1961 | ||
5e16da05 | 1962 | ret = LTTCOMM_UND; |
5461b305 | 1963 | break; |
fac6795d DG |
1964 | } |
1965 | ||
5461b305 DG |
1966 | /* Set return code */ |
1967 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 1968 | |
b5541356 DG |
1969 | if (cmd_ctx->session) { |
1970 | unlock_session(cmd_ctx->session); | |
1971 | } | |
1972 | ||
e065084a DG |
1973 | return ret; |
1974 | ||
5461b305 | 1975 | error: |
5461b305 DG |
1976 | if (cmd_ctx->llm == NULL) { |
1977 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 1978 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
1979 | goto setup_error; |
1980 | } | |
1981 | } | |
e065084a | 1982 | /* Notify client of error */ |
5461b305 | 1983 | cmd_ctx->llm->ret_code = ret; |
e065084a | 1984 | |
5461b305 | 1985 | setup_error: |
b5541356 DG |
1986 | if (cmd_ctx->session) { |
1987 | unlock_session(cmd_ctx->session); | |
1988 | } | |
8028d920 | 1989 | return ret; |
fac6795d DG |
1990 | } |
1991 | ||
1d4b027a | 1992 | /* |
d063d709 DG |
1993 | * This thread manage all clients request using the unix client socket for |
1994 | * communication. | |
1d4b027a DG |
1995 | */ |
1996 | static void *thread_manage_clients(void *data) | |
1997 | { | |
273ea72c DG |
1998 | int sock = 0, ret; |
1999 | struct command_ctx *cmd_ctx = NULL; | |
2000 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2001 | |
2002 | DBG("[thread] Manage client started"); | |
2003 | ||
2004 | ret = lttcomm_listen_unix_sock(client_sock); | |
2005 | if (ret < 0) { | |
2006 | goto error; | |
2007 | } | |
2008 | ||
273ea72c DG |
2009 | /* First fd is always the quit pipe */ |
2010 | pollfd[0].fd = thread_quit_pipe[0]; | |
2011 | ||
2012 | /* Apps socket */ | |
2013 | pollfd[1].fd = client_sock; | |
2014 | pollfd[1].events = POLLIN; | |
2015 | ||
1d4b027a DG |
2016 | /* Notify parent pid that we are ready |
2017 | * to accept command for client side. | |
2018 | */ | |
2019 | if (opt_sig_parent) { | |
2020 | kill(ppid, SIGCHLD); | |
2021 | } | |
2022 | ||
2023 | while (1) { | |
1d4b027a | 2024 | DBG("Accepting client command ..."); |
273ea72c DG |
2025 | |
2026 | /* Inifinite blocking call, waiting for transmission */ | |
2027 | ret = poll(pollfd, 2, -1); | |
2028 | if (ret < 0) { | |
2029 | perror("poll client thread"); | |
2030 | goto error; | |
2031 | } | |
2032 | ||
2033 | /* Thread quit pipe has been closed. Killing thread. */ | |
2034 | if (pollfd[0].revents == POLLNVAL) { | |
2035 | goto error; | |
2036 | } else if (pollfd[1].revents == POLLERR) { | |
2037 | ERR("Client socket poll error"); | |
2038 | goto error; | |
2039 | } | |
2040 | ||
1d4b027a DG |
2041 | sock = lttcomm_accept_unix_sock(client_sock); |
2042 | if (sock < 0) { | |
2043 | goto error; | |
2044 | } | |
2045 | ||
2046 | /* Allocate context command to process the client request */ | |
2047 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2048 | ||
2049 | /* Allocate data buffer for reception */ | |
2050 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2051 | cmd_ctx->llm = NULL; | |
2052 | cmd_ctx->session = NULL; | |
2053 | ||
2054 | /* | |
2055 | * Data is received from the lttng client. The struct | |
2056 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2057 | * the client. | |
2058 | */ | |
2059 | DBG("Receiving data from client ..."); | |
2060 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2061 | if (ret <= 0) { | |
2062 | continue; | |
2063 | } | |
2064 | ||
f7776ea7 DG |
2065 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2066 | ||
1d4b027a DG |
2067 | /* |
2068 | * This function dispatch the work to the kernel or userspace tracer | |
2069 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2070 | * informations for the client. The command context struct contains | |
2071 | * everything this function may needs. | |
2072 | */ | |
2073 | ret = process_client_msg(cmd_ctx); | |
2074 | if (ret < 0) { | |
2075 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2076 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2077 | /* Error detected but still accept command */ | |
a2fb29a5 | 2078 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2079 | continue; |
2080 | } | |
2081 | ||
2082 | DBG("Sending response (size: %d, retcode: %d)", | |
2083 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2084 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2085 | if (ret < 0) { | |
2086 | ERR("Failed to send data back to client"); | |
2087 | } | |
2088 | ||
a2fb29a5 | 2089 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2090 | |
2091 | /* End of transmission */ | |
2092 | close(sock); | |
1d4b027a DG |
2093 | } |
2094 | ||
2095 | error: | |
273ea72c DG |
2096 | DBG("Client thread dying"); |
2097 | if (client_sock) { | |
2098 | close(client_sock); | |
2099 | } | |
2100 | if (sock) { | |
2101 | close(sock); | |
2102 | } | |
2103 | ||
2104 | unlink(client_unix_sock_path); | |
2105 | ||
a2fb29a5 | 2106 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2107 | return NULL; |
2108 | } | |
2109 | ||
2110 | ||
fac6795d DG |
2111 | /* |
2112 | * usage function on stderr | |
2113 | */ | |
2114 | static void usage(void) | |
2115 | { | |
b716ce68 | 2116 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2117 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2118 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2119 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2120 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2121 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2122 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2123 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2124 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2125 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2126 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2127 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
fac6795d DG |
2128 | } |
2129 | ||
2130 | /* | |
2131 | * daemon argument parsing | |
2132 | */ | |
2133 | static int parse_args(int argc, char **argv) | |
2134 | { | |
2135 | int c; | |
2136 | ||
2137 | static struct option long_options[] = { | |
2138 | { "client-sock", 1, 0, 'c' }, | |
2139 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2140 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2141 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2142 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2143 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2144 | { "help", 0, 0, 'h' }, |
2145 | { "group", 1, 0, 'g' }, | |
2146 | { "version", 0, 0, 'V' }, | |
75462a81 | 2147 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2148 | { "verbose", 0, 0, 'v' }, |
fac6795d DG |
2149 | { NULL, 0, 0, 0 } |
2150 | }; | |
2151 | ||
2152 | while (1) { | |
2153 | int option_index = 0; | |
d6f42150 | 2154 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index); |
fac6795d DG |
2155 | if (c == -1) { |
2156 | break; | |
2157 | } | |
2158 | ||
2159 | switch (c) { | |
2160 | case 0: | |
2161 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2162 | if (optarg) { | |
2163 | fprintf(stderr, " with arg %s\n", optarg); | |
2164 | } | |
2165 | break; | |
b716ce68 | 2166 | case 'c': |
fac6795d DG |
2167 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2168 | break; | |
2169 | case 'a': | |
2170 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2171 | break; | |
2172 | case 'd': | |
2173 | opt_daemon = 1; | |
2174 | break; | |
2175 | case 'g': | |
2176 | opt_tracing_group = strdup(optarg); | |
2177 | break; | |
2178 | case 'h': | |
2179 | usage(); | |
2180 | exit(EXIT_FAILURE); | |
2181 | case 'V': | |
2182 | fprintf(stdout, "%s\n", VERSION); | |
2183 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2184 | case 'S': |
2185 | opt_sig_parent = 1; | |
2186 | break; | |
d6f42150 DG |
2187 | case 'E': |
2188 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2189 | break; | |
2190 | case 'C': | |
2191 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2192 | break; | |
75462a81 DG |
2193 | case 'q': |
2194 | opt_quiet = 1; | |
2195 | break; | |
3f9947db | 2196 | case 'v': |
53086306 DG |
2197 | /* Verbose level can increase using multiple -v */ |
2198 | opt_verbose += 1; | |
3f9947db | 2199 | break; |
fac6795d DG |
2200 | default: |
2201 | /* Unknown option or other error. | |
2202 | * Error is printed by getopt, just return */ | |
2203 | return -1; | |
2204 | } | |
2205 | } | |
2206 | ||
2207 | return 0; | |
2208 | } | |
2209 | ||
2210 | /* | |
d063d709 | 2211 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2212 | * apps_sock - The communication socket for all UST apps. |
2213 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d DG |
2214 | */ |
2215 | static int init_daemon_socket() | |
2216 | { | |
2217 | int ret = 0; | |
2218 | mode_t old_umask; | |
2219 | ||
2220 | old_umask = umask(0); | |
2221 | ||
2222 | /* Create client tool unix socket */ | |
d6f42150 DG |
2223 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2224 | if (client_sock < 0) { | |
2225 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2226 | ret = -1; |
2227 | goto end; | |
2228 | } | |
2229 | ||
2230 | /* File permission MUST be 660 */ | |
2231 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2232 | if (ret < 0) { | |
d6f42150 | 2233 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2234 | perror("chmod"); |
2235 | goto end; | |
2236 | } | |
2237 | ||
2238 | /* Create the application unix socket */ | |
d6f42150 DG |
2239 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2240 | if (apps_sock < 0) { | |
2241 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2242 | ret = -1; |
2243 | goto end; | |
2244 | } | |
2245 | ||
d6f42150 | 2246 | /* File permission MUST be 666 */ |
fac6795d DG |
2247 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2248 | if (ret < 0) { | |
d6f42150 | 2249 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2250 | perror("chmod"); |
2251 | goto end; | |
2252 | } | |
2253 | ||
2254 | end: | |
2255 | umask(old_umask); | |
2256 | return ret; | |
2257 | } | |
2258 | ||
2259 | /* | |
d063d709 | 2260 | * Check if the global socket is available. If yes, error is returned. |
fac6795d DG |
2261 | */ |
2262 | static int check_existing_daemon() | |
2263 | { | |
2264 | int ret; | |
2265 | ||
2266 | ret = access(client_unix_sock_path, F_OK); | |
2267 | if (ret == 0) { | |
2268 | ret = access(apps_unix_sock_path, F_OK); | |
2269 | } | |
2270 | ||
2271 | return ret; | |
2272 | } | |
2273 | ||
fac6795d | 2274 | /* |
d063d709 | 2275 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2276 | * |
d063d709 DG |
2277 | * Race window between mkdir and chown is OK because we are going from more |
2278 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2279 | */ |
d6f42150 | 2280 | static int set_permissions(void) |
fac6795d DG |
2281 | { |
2282 | int ret; | |
2283 | struct group *grp; | |
2284 | ||
2285 | /* Decide which group name to use */ | |
2286 | (opt_tracing_group != NULL) ? | |
2287 | (grp = getgrnam(opt_tracing_group)) : | |
2288 | (grp = getgrnam(default_tracing_group)); | |
2289 | ||
2290 | if (grp == NULL) { | |
a463f419 DG |
2291 | if (is_root) { |
2292 | WARN("No tracing group detected"); | |
2293 | ret = 0; | |
2294 | } else { | |
2295 | ERR("Missing tracing group. Aborting execution."); | |
2296 | ret = -1; | |
2297 | } | |
fac6795d DG |
2298 | goto end; |
2299 | } | |
2300 | ||
d6f42150 DG |
2301 | /* Set lttng run dir */ |
2302 | ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid); | |
2303 | if (ret < 0) { | |
2304 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2305 | perror("chown"); | |
2306 | } | |
2307 | ||
2308 | /* lttng client socket path */ | |
fac6795d DG |
2309 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); |
2310 | if (ret < 0) { | |
d6f42150 DG |
2311 | ERR("Unable to set group on %s", client_unix_sock_path); |
2312 | perror("chown"); | |
2313 | } | |
2314 | ||
2315 | /* kconsumerd error socket path */ | |
2316 | ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid); | |
2317 | if (ret < 0) { | |
2318 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2319 | perror("chown"); |
2320 | } | |
2321 | ||
d6f42150 | 2322 | DBG("All permissions are set"); |
e07ae692 | 2323 | |
fac6795d DG |
2324 | end: |
2325 | return ret; | |
2326 | } | |
2327 | ||
7a485870 | 2328 | /* |
d063d709 | 2329 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2330 | */ |
2331 | static int create_kernel_poll_pipe(void) | |
2332 | { | |
2333 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2334 | } | |
2335 | ||
d6f42150 | 2336 | /* |
d063d709 | 2337 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2338 | */ |
2339 | static int create_lttng_rundir(void) | |
2340 | { | |
2341 | int ret; | |
2342 | ||
2343 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2344 | if (ret < 0) { | |
b1f11e69 DG |
2345 | if (errno != EEXIST) { |
2346 | ERR("Unable to create " LTTNG_RUNDIR); | |
2347 | goto error; | |
2348 | } else { | |
2349 | ret = 0; | |
2350 | } | |
d6f42150 DG |
2351 | } |
2352 | ||
2353 | error: | |
2354 | return ret; | |
2355 | } | |
2356 | ||
2357 | /* | |
d063d709 DG |
2358 | * Setup sockets and directory needed by the kconsumerd communication with the |
2359 | * session daemon. | |
d6f42150 DG |
2360 | */ |
2361 | static int set_kconsumerd_sockets(void) | |
2362 | { | |
2363 | int ret; | |
2364 | ||
2365 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2366 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2367 | } | |
2368 | ||
2369 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2370 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2371 | } | |
2372 | ||
2373 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2374 | if (ret < 0) { | |
6beb2242 DG |
2375 | if (errno != EEXIST) { |
2376 | ERR("Failed to create " KCONSUMERD_PATH); | |
2377 | goto error; | |
2378 | } | |
2379 | ret = 0; | |
d6f42150 DG |
2380 | } |
2381 | ||
2382 | /* Create the kconsumerd error unix socket */ | |
2383 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
2384 | if (kconsumerd_err_sock < 0) { | |
2385 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
2386 | ret = -1; | |
2387 | goto error; | |
2388 | } | |
2389 | ||
2390 | /* File permission MUST be 660 */ | |
2391 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2392 | if (ret < 0) { | |
2393 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
2394 | perror("chmod"); | |
2395 | goto error; | |
2396 | } | |
2397 | ||
2398 | error: | |
2399 | return ret; | |
2400 | } | |
2401 | ||
fac6795d | 2402 | /* |
d063d709 | 2403 | * Signal handler for the daemon |
fac6795d DG |
2404 | */ |
2405 | static void sighandler(int sig) | |
2406 | { | |
2407 | switch (sig) { | |
2408 | case SIGPIPE: | |
e07ae692 | 2409 | DBG("SIGPIPE catched"); |
87378cf5 | 2410 | return; |
fac6795d | 2411 | case SIGINT: |
e07ae692 DG |
2412 | DBG("SIGINT catched"); |
2413 | cleanup(); | |
2414 | break; | |
fac6795d | 2415 | case SIGTERM: |
e07ae692 | 2416 | DBG("SIGTERM catched"); |
fac6795d | 2417 | cleanup(); |
686204ab | 2418 | break; |
fac6795d DG |
2419 | default: |
2420 | break; | |
2421 | } | |
2422 | ||
2423 | exit(EXIT_SUCCESS); | |
2424 | } | |
2425 | ||
2426 | /* | |
d063d709 | 2427 | * Setup signal handler for : |
1d4b027a | 2428 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 2429 | */ |
1d4b027a | 2430 | static int set_signal_handler(void) |
fac6795d | 2431 | { |
1d4b027a DG |
2432 | int ret = 0; |
2433 | struct sigaction sa; | |
2434 | sigset_t sigset; | |
fac6795d | 2435 | |
1d4b027a DG |
2436 | if ((ret = sigemptyset(&sigset)) < 0) { |
2437 | perror("sigemptyset"); | |
2438 | return ret; | |
2439 | } | |
d6f42150 | 2440 | |
1d4b027a DG |
2441 | sa.sa_handler = sighandler; |
2442 | sa.sa_mask = sigset; | |
2443 | sa.sa_flags = 0; | |
2444 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
2445 | perror("sigaction"); | |
2446 | return ret; | |
d6f42150 DG |
2447 | } |
2448 | ||
1d4b027a DG |
2449 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
2450 | perror("sigaction"); | |
2451 | return ret; | |
d6f42150 | 2452 | } |
aaf26714 | 2453 | |
1d4b027a DG |
2454 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
2455 | perror("sigaction"); | |
2456 | return ret; | |
8c0faa1d DG |
2457 | } |
2458 | ||
1d4b027a DG |
2459 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
2460 | ||
2461 | return ret; | |
fac6795d DG |
2462 | } |
2463 | ||
f3ed775e | 2464 | /* |
d063d709 DG |
2465 | * Set open files limit to unlimited. This daemon can open a large number of |
2466 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
2467 | */ |
2468 | static void set_ulimit(void) | |
2469 | { | |
2470 | int ret; | |
2471 | struct rlimit lim; | |
2472 | ||
a88df331 | 2473 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
2474 | lim.rlim_cur = 65535; |
2475 | lim.rlim_max = 65535; | |
2476 | ||
2477 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
2478 | if (ret < 0) { | |
2479 | perror("failed to set open files limit"); | |
2480 | } | |
2481 | } | |
2482 | ||
fac6795d DG |
2483 | /* |
2484 | * main | |
2485 | */ | |
2486 | int main(int argc, char **argv) | |
2487 | { | |
fac6795d DG |
2488 | int ret = 0; |
2489 | void *status; | |
b082db07 | 2490 | const char *home_path; |
fac6795d | 2491 | |
273ea72c DG |
2492 | /* Create thread quit pipe */ |
2493 | if (init_thread_quit_pipe() < 0) { | |
a88df331 | 2494 | goto exit; |
273ea72c DG |
2495 | } |
2496 | ||
fac6795d DG |
2497 | /* Parse arguments */ |
2498 | progname = argv[0]; | |
2499 | if ((ret = parse_args(argc, argv) < 0)) { | |
a88df331 | 2500 | goto exit; |
fac6795d DG |
2501 | } |
2502 | ||
2503 | /* Daemonize */ | |
2504 | if (opt_daemon) { | |
53094c05 DG |
2505 | ret = daemon(0, 0); |
2506 | if (ret < 0) { | |
2507 | perror("daemon"); | |
a88df331 | 2508 | goto exit; |
53094c05 | 2509 | } |
fac6795d DG |
2510 | } |
2511 | ||
2512 | /* Check if daemon is UID = 0 */ | |
2513 | is_root = !getuid(); | |
2514 | ||
fac6795d | 2515 | if (is_root) { |
d6f42150 DG |
2516 | ret = create_lttng_rundir(); |
2517 | if (ret < 0) { | |
a88df331 | 2518 | goto exit; |
d6f42150 DG |
2519 | } |
2520 | ||
fac6795d | 2521 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
2522 | snprintf(apps_unix_sock_path, PATH_MAX, |
2523 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
2524 | } |
2525 | ||
2526 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
2527 | snprintf(client_unix_sock_path, PATH_MAX, |
2528 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
2529 | } | |
fac6795d | 2530 | } else { |
b082db07 DG |
2531 | home_path = get_home_dir(); |
2532 | if (home_path == NULL) { | |
273ea72c DG |
2533 | /* TODO: Add --socket PATH option */ |
2534 | ERR("Can't get HOME directory for sockets creation."); | |
a88df331 | 2535 | goto exit; |
b082db07 DG |
2536 | } |
2537 | ||
fac6795d | 2538 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 2539 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 2540 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
2541 | } |
2542 | ||
2543 | /* Set the cli tool unix socket path */ | |
2544 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 2545 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 2546 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d DG |
2547 | } |
2548 | } | |
2549 | ||
847177cd DG |
2550 | DBG("Client socket path %s", client_unix_sock_path); |
2551 | DBG("Application socket path %s", apps_unix_sock_path); | |
2552 | ||
273ea72c DG |
2553 | /* |
2554 | * See if daemon already exist. If any of the two socket needed by the | |
2555 | * daemon are present, this test fails. However, if the daemon is killed | |
2556 | * with a SIGKILL, those unix socket must be unlinked by hand. | |
fac6795d DG |
2557 | */ |
2558 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 2559 | ERR("Already running daemon.\n"); |
273ea72c | 2560 | /* |
a88df331 DG |
2561 | * We do not goto error because we must not cleanup() because a daemon |
2562 | * is already running. | |
ab118b20 | 2563 | */ |
a88df331 DG |
2564 | goto exit; |
2565 | } | |
2566 | ||
2567 | /* After this point, we can safely call cleanup() so goto error is used */ | |
2568 | ||
2569 | /* | |
2570 | * These actions must be executed as root. We do that *after* setting up | |
2571 | * the sockets path because we MUST make the check for another daemon using | |
2572 | * those paths *before* trying to set the kernel consumer sockets and init | |
2573 | * kernel tracer. | |
2574 | */ | |
2575 | if (is_root) { | |
2576 | ret = set_kconsumerd_sockets(); | |
2577 | if (ret < 0) { | |
2578 | goto error; | |
2579 | } | |
2580 | ||
2581 | /* Setup kernel tracer */ | |
2582 | init_kernel_tracer(); | |
2583 | ||
2584 | /* Set ulimit for open files */ | |
2585 | set_ulimit(); | |
fac6795d DG |
2586 | } |
2587 | ||
2588 | if (set_signal_handler() < 0) { | |
2589 | goto error; | |
2590 | } | |
2591 | ||
d6f42150 | 2592 | /* Setup the needed unix socket */ |
fac6795d DG |
2593 | if (init_daemon_socket() < 0) { |
2594 | goto error; | |
2595 | } | |
2596 | ||
2597 | /* Set credentials to socket */ | |
d6f42150 | 2598 | if (is_root && (set_permissions() < 0)) { |
fac6795d DG |
2599 | goto error; |
2600 | } | |
2601 | ||
5b8719f5 DG |
2602 | /* Get parent pid if -S, --sig-parent is specified. */ |
2603 | if (opt_sig_parent) { | |
2604 | ppid = getppid(); | |
2605 | } | |
2606 | ||
7a485870 DG |
2607 | /* Setup the kernel pipe for waking up the kernel thread */ |
2608 | if (create_kernel_poll_pipe() < 0) { | |
2609 | goto error; | |
2610 | } | |
2611 | ||
273ea72c DG |
2612 | /* |
2613 | * Get session list pointer. This pointer MUST NOT be free(). | |
2614 | * This list is statically declared in session.c | |
2615 | */ | |
b5541356 DG |
2616 | session_list_ptr = get_session_list(); |
2617 | ||
fac6795d DG |
2618 | while (1) { |
2619 | /* Create thread to manage the client socket */ | |
1d4b027a | 2620 | ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL); |
fac6795d DG |
2621 | if (ret != 0) { |
2622 | perror("pthread_create"); | |
2623 | goto error; | |
2624 | } | |
2625 | ||
2626 | /* Create thread to manage application socket */ | |
1d4b027a | 2627 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); |
fac6795d DG |
2628 | if (ret != 0) { |
2629 | perror("pthread_create"); | |
2630 | goto error; | |
2631 | } | |
2632 | ||
7a485870 DG |
2633 | /* Create kernel thread to manage kernel event */ |
2634 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
2635 | if (ret != 0) { | |
2636 | perror("pthread_create"); | |
2637 | goto error; | |
2638 | } | |
2639 | ||
1d4b027a DG |
2640 | ret = pthread_join(client_thread, &status); |
2641 | if (ret != 0) { | |
2642 | perror("pthread_join"); | |
2643 | goto error; | |
fac6795d DG |
2644 | } |
2645 | } | |
2646 | ||
2647 | cleanup(); | |
5e16da05 | 2648 | exit(EXIT_SUCCESS); |
fac6795d DG |
2649 | |
2650 | error: | |
2651 | cleanup(); | |
a88df331 DG |
2652 | |
2653 | exit: | |
5e16da05 | 2654 | exit(EXIT_FAILURE); |
fac6795d | 2655 | } |