Commit | Line | Data |
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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 | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
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" |
62d3069f | 52 | #include "libustctl.h" |
8e68d1c8 | 53 | #include "utils.h" |
fac6795d | 54 | |
5e16da05 MD |
55 | /* |
56 | * TODO: | |
57 | * teardown: signal SIGTERM handler -> write into pipe. Threads waits | |
58 | * with epoll on pipe and on other pipes/sockets for commands. Main | |
59 | * simply waits on pthread join. | |
60 | */ | |
61 | ||
75462a81 | 62 | /* Const values */ |
686204ab | 63 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 64 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
65 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
66 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
67 | ||
fac6795d | 68 | /* Variables */ |
1d4b027a DG |
69 | int opt_verbose; /* Not static for lttngerr.h */ |
70 | int opt_quiet; /* Not static for lttngerr.h */ | |
fac6795d DG |
71 | const char *progname; |
72 | const char *opt_tracing_group; | |
5b8719f5 | 73 | static int opt_sig_parent; |
fac6795d DG |
74 | static int opt_daemon; |
75 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
76 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
77 | static pid_t kconsumerd_pid; | |
7a485870 | 78 | static struct pollfd *kernel_pollfd; |
fac6795d | 79 | |
d6f42150 DG |
80 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
81 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
82 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
83 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
fac6795d | 84 | |
1d4b027a | 85 | /* Sockets and FDs */ |
d6f42150 DG |
86 | static int client_sock; |
87 | static int apps_sock; | |
88 | static int kconsumerd_err_sock; | |
8c0faa1d | 89 | static int kconsumerd_cmd_sock; |
20fe2104 | 90 | static int kernel_tracer_fd; |
7a485870 | 91 | static int kernel_poll_pipe[2]; |
1d4b027a DG |
92 | |
93 | /* Pthread, Mutexes and Semaphores */ | |
8c0faa1d | 94 | static pthread_t kconsumerd_thread; |
1d4b027a DG |
95 | static pthread_t apps_thread; |
96 | static pthread_t client_thread; | |
7a485870 | 97 | static pthread_t kernel_thread; |
8c0faa1d DG |
98 | static sem_t kconsumerd_sem; |
99 | ||
1d4b027a | 100 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
fac6795d | 101 | |
fac6795d | 102 | /* |
1d4b027a | 103 | * teardown_kernel_session |
fac6795d | 104 | * |
1d4b027a DG |
105 | * Complete teardown of a kernel session. This free all data structure |
106 | * related to a kernel session and update counter. | |
fac6795d | 107 | */ |
1d4b027a | 108 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 109 | { |
1d4b027a DG |
110 | if (session->kernel_session != NULL) { |
111 | DBG("Tearing down kernel session"); | |
c363b55d | 112 | trace_destroy_kernel_session(session->kernel_session); |
1d4b027a DG |
113 | /* Extra precaution */ |
114 | session->kernel_session = NULL; | |
fac6795d | 115 | } |
fac6795d DG |
116 | } |
117 | ||
118 | /* | |
1d4b027a | 119 | * cleanup |
fac6795d | 120 | * |
1d4b027a | 121 | * Cleanup the daemon on exit |
fac6795d | 122 | */ |
1d4b027a | 123 | static void cleanup() |
fac6795d | 124 | { |
1d4b027a DG |
125 | int ret; |
126 | char *cmd; | |
127 | struct ltt_session *sess; | |
fac6795d | 128 | |
1d4b027a | 129 | DBG("Cleaning up"); |
e07ae692 | 130 | |
1d4b027a DG |
131 | /* <fun> */ |
132 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); | |
133 | MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0); | |
134 | /* </fun> */ | |
fac6795d | 135 | |
1d4b027a DG |
136 | /* Stopping all threads */ |
137 | DBG("Terminating all threads"); | |
138 | pthread_cancel(client_thread); | |
139 | pthread_cancel(apps_thread); | |
7a485870 | 140 | pthread_cancel(kernel_thread); |
1d4b027a DG |
141 | if (kconsumerd_pid != 0) { |
142 | pthread_cancel(kconsumerd_thread); | |
5b8719f5 DG |
143 | } |
144 | ||
1d4b027a DG |
145 | DBG("Unlinking all unix socket"); |
146 | unlink(client_unix_sock_path); | |
147 | unlink(apps_unix_sock_path); | |
148 | unlink(kconsumerd_err_unix_sock_path); | |
fac6795d | 149 | |
1d4b027a DG |
150 | DBG("Removing %s directory", LTTNG_RUNDIR); |
151 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
152 | if (ret < 0) { | |
153 | ERR("asprintf failed. Something is really wrong!"); | |
154 | } | |
5461b305 | 155 | |
1d4b027a DG |
156 | /* Remove lttng run directory */ |
157 | ret = system(cmd); | |
158 | if (ret < 0) { | |
159 | ERR("Unable to clean " LTTNG_RUNDIR); | |
160 | } | |
5461b305 | 161 | |
1d4b027a DG |
162 | DBG("Cleaning up all session"); |
163 | /* Cleanup ALL session */ | |
164 | cds_list_for_each_entry(sess, <t_session_list.head, list) { | |
165 | teardown_kernel_session(sess); | |
166 | // TODO complete session cleanup (including UST) | |
fac6795d DG |
167 | } |
168 | ||
f3ed775e | 169 | DBG("Closing kernel fd"); |
1d4b027a | 170 | close(kernel_tracer_fd); |
7a485870 DG |
171 | close(kernel_poll_pipe[0]); |
172 | close(kernel_poll_pipe[1]); | |
fac6795d DG |
173 | } |
174 | ||
e065084a DG |
175 | /* |
176 | * send_unix_sock | |
177 | * | |
178 | * Send data on a unix socket using the liblttsessiondcomm API. | |
179 | * | |
180 | * Return lttcomm error code. | |
181 | */ | |
182 | static int send_unix_sock(int sock, void *buf, size_t len) | |
183 | { | |
184 | /* Check valid length */ | |
185 | if (len <= 0) { | |
186 | return -1; | |
187 | } | |
188 | ||
189 | return lttcomm_send_unix_sock(sock, buf, len); | |
190 | } | |
191 | ||
5461b305 DG |
192 | /* |
193 | * clean_command_ctx | |
194 | * | |
195 | * Free memory of a command context structure. | |
196 | */ | |
197 | static void clean_command_ctx(struct command_ctx *cmd_ctx) | |
198 | { | |
199 | DBG("Clean command context structure %p", cmd_ctx); | |
200 | if (cmd_ctx) { | |
201 | if (cmd_ctx->llm) { | |
202 | free(cmd_ctx->llm); | |
203 | } | |
204 | if (cmd_ctx->lsm) { | |
205 | free(cmd_ctx->lsm); | |
206 | } | |
207 | free(cmd_ctx); | |
208 | cmd_ctx = NULL; | |
209 | } | |
210 | } | |
211 | ||
f3ed775e | 212 | /* |
7a485870 | 213 | * send_kconsumerd_channel_fds |
f3ed775e | 214 | * |
7a485870 | 215 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 216 | */ |
7a485870 | 217 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
218 | { |
219 | int ret; | |
220 | size_t nb_fd; | |
221 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
222 | struct lttcomm_kconsumerd_header lkh; |
223 | struct lttcomm_kconsumerd_msg lkm; | |
224 | ||
7a485870 DG |
225 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
226 | ||
227 | nb_fd = channel->stream_count; | |
f3ed775e DG |
228 | |
229 | /* Setup header */ | |
7a485870 | 230 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
231 | lkh.cmd_type = ADD_STREAM; |
232 | ||
233 | DBG("Sending kconsumerd header"); | |
234 | ||
235 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
236 | if (ret < 0) { | |
237 | perror("send kconsumerd header"); | |
238 | goto error; | |
239 | } | |
240 | ||
7a485870 DG |
241 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
242 | if (stream->fd != 0) { | |
f3ed775e DG |
243 | lkm.fd = stream->fd; |
244 | lkm.state = stream->state; | |
7a485870 | 245 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
f3ed775e DG |
246 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
247 | ||
248 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
249 | ||
250 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
251 | if (ret < 0) { | |
252 | perror("send kconsumerd fd"); | |
253 | goto error; | |
254 | } | |
255 | } | |
256 | } | |
257 | ||
7a485870 | 258 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
259 | |
260 | return 0; | |
261 | ||
262 | error: | |
263 | return ret; | |
264 | } | |
265 | ||
266 | /* | |
7a485870 | 267 | * send_kconsumerd_fds |
f3ed775e | 268 | * |
7a485870 | 269 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 270 | */ |
7a485870 | 271 | static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session) |
f3ed775e DG |
272 | { |
273 | int ret; | |
274 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
275 | struct lttcomm_kconsumerd_header lkh; |
276 | struct lttcomm_kconsumerd_msg lkm; | |
277 | ||
278 | /* Setup header */ | |
279 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
280 | lkh.cmd_type = ADD_STREAM; | |
281 | ||
282 | DBG("Sending kconsumerd header for metadata"); | |
283 | ||
284 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
285 | if (ret < 0) { | |
286 | perror("send kconsumerd header"); | |
287 | goto error; | |
288 | } | |
289 | ||
290 | DBG("Sending metadata stream fd"); | |
291 | ||
292 | if (session->metadata_stream_fd != 0) { | |
293 | /* Send metadata stream fd first */ | |
294 | lkm.fd = session->metadata_stream_fd; | |
295 | lkm.state = ACTIVE_FD; | |
296 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
297 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); | |
298 | ||
299 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
300 | if (ret < 0) { | |
301 | perror("send kconsumerd fd"); | |
302 | goto error; | |
303 | } | |
304 | } | |
f3ed775e | 305 | |
f3ed775e | 306 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
7a485870 | 307 | ret = send_kconsumerd_channel_fds(sock, chan); |
f3ed775e | 308 | if (ret < 0) { |
7a485870 | 309 | goto error; |
f3ed775e DG |
310 | } |
311 | } | |
312 | ||
7a485870 DG |
313 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
314 | ||
f3ed775e DG |
315 | return 0; |
316 | ||
317 | error: | |
318 | return ret; | |
319 | } | |
320 | ||
fac6795d | 321 | /* |
471d1693 | 322 | * ust_connect_app |
fac6795d DG |
323 | * |
324 | * Return a socket connected to the libust communication socket | |
325 | * of the application identified by the pid. | |
379473d2 DG |
326 | * |
327 | * If the pid is not found in the traceable list, | |
328 | * return -1 to indicate error. | |
fac6795d | 329 | */ |
471d1693 | 330 | static int ust_connect_app(pid_t pid) |
fac6795d | 331 | { |
91d76f53 DG |
332 | int sock; |
333 | struct ltt_traceable_app *lta; | |
379473d2 | 334 | |
e07ae692 DG |
335 | DBG("Connect to application pid %d", pid); |
336 | ||
91d76f53 DG |
337 | lta = find_app_by_pid(pid); |
338 | if (lta == NULL) { | |
339 | /* App not found */ | |
7442b2ba | 340 | DBG("Application pid %d not found", pid); |
379473d2 DG |
341 | return -1; |
342 | } | |
fac6795d | 343 | |
91d76f53 | 344 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 345 | if (sock < 0) { |
62d3069f | 346 | ERR("Fail connecting to the PID %d", pid); |
fac6795d DG |
347 | } |
348 | ||
349 | return sock; | |
350 | } | |
351 | ||
352 | /* | |
353 | * notify_apps | |
354 | * | |
355 | * Notify apps by writing 42 to a named pipe using name. | |
356 | * Every applications waiting for a ltt-sessiond will be notified | |
357 | * and re-register automatically to the session daemon. | |
358 | * | |
359 | * Return open or write error value. | |
360 | */ | |
361 | static int notify_apps(const char *name) | |
362 | { | |
363 | int fd; | |
364 | int ret = -1; | |
365 | ||
e07ae692 DG |
366 | DBG("Notify the global application pipe"); |
367 | ||
fac6795d DG |
368 | /* Try opening the global pipe */ |
369 | fd = open(name, O_WRONLY); | |
370 | if (fd < 0) { | |
371 | goto error; | |
372 | } | |
373 | ||
374 | /* Notify by writing on the pipe */ | |
375 | ret = write(fd, "42", 2); | |
376 | if (ret < 0) { | |
377 | perror("write"); | |
378 | } | |
379 | ||
380 | error: | |
381 | return ret; | |
382 | } | |
383 | ||
e065084a | 384 | /* |
5461b305 | 385 | * setup_lttng_msg |
ca95a216 | 386 | * |
5461b305 DG |
387 | * Setup the outgoing data buffer for the response (llm) by allocating the |
388 | * right amount of memory and copying the original information from the lsm | |
389 | * structure. | |
ca95a216 DG |
390 | * |
391 | * Return total size of the buffer pointed by buf. | |
392 | */ | |
5461b305 | 393 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 394 | { |
f3ed775e | 395 | int ret, buf_size; |
ca95a216 | 396 | |
f3ed775e | 397 | buf_size = size; |
5461b305 DG |
398 | |
399 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
400 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 401 | perror("malloc"); |
5461b305 | 402 | ret = -ENOMEM; |
ca95a216 DG |
403 | goto error; |
404 | } | |
405 | ||
5461b305 DG |
406 | /* Copy common data */ |
407 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
408 | cmd_ctx->llm->pid = cmd_ctx->lsm->pid; | |
5461b305 | 409 | |
5461b305 DG |
410 | cmd_ctx->llm->data_size = size; |
411 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
412 | ||
ca95a216 DG |
413 | return buf_size; |
414 | ||
415 | error: | |
416 | return ret; | |
417 | } | |
418 | ||
7a485870 DG |
419 | /* |
420 | * update_kernel_pollfd | |
421 | * | |
422 | * Update the kernel pollfd set of all channel fd available over | |
423 | * all tracing session. Add the wakeup pipe at the end of the set. | |
424 | */ | |
425 | static int update_kernel_pollfd(void) | |
426 | { | |
427 | int i = 0; | |
428 | unsigned int nb_fd = 1; | |
429 | struct ltt_session *session; | |
430 | struct ltt_kernel_channel *channel; | |
431 | ||
432 | DBG("Updating kernel_pollfd"); | |
433 | ||
434 | /* Get the number of channel of all kernel session */ | |
435 | cds_list_for_each_entry(session, <t_session_list.head, list) { | |
436 | if (session->kernel_session == NULL) { | |
437 | continue; | |
438 | } | |
439 | nb_fd += session->kernel_session->channel_count; | |
440 | } | |
441 | ||
442 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
443 | ||
444 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
445 | if (kernel_pollfd == NULL) { | |
446 | perror("malloc kernel_pollfd"); | |
447 | goto error; | |
448 | } | |
449 | ||
450 | cds_list_for_each_entry(session, <t_session_list.head, list) { | |
451 | if (session->kernel_session == NULL) { | |
452 | continue; | |
453 | } | |
454 | if (i >= nb_fd) { | |
455 | ERR("To much channel for kernel_pollfd size"); | |
456 | break; | |
457 | } | |
458 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
459 | kernel_pollfd[i].fd = channel->fd; | |
460 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
461 | i++; | |
462 | } | |
463 | } | |
464 | ||
465 | /* Adding wake up pipe */ | |
466 | kernel_pollfd[nb_fd - 1].fd = kernel_poll_pipe[0]; | |
467 | kernel_pollfd[nb_fd - 1].events = POLLIN; | |
468 | ||
469 | return nb_fd; | |
470 | ||
471 | error: | |
472 | return -1; | |
473 | } | |
474 | ||
475 | /* | |
476 | * update_kernel_stream | |
477 | * | |
478 | * Find the channel fd from 'fd' over all tracing session. When found, check | |
479 | * for new channel stream and send those stream fds to the kernel consumer. | |
480 | * | |
481 | * Useful for CPU hotplug feature. | |
482 | */ | |
483 | static int update_kernel_stream(int fd) | |
484 | { | |
485 | int ret = 0; | |
486 | struct ltt_session *session; | |
487 | struct ltt_kernel_channel *channel; | |
488 | ||
489 | DBG("Updating kernel streams for channel fd %d", fd); | |
490 | ||
491 | cds_list_for_each_entry(session, <t_session_list.head, list) { | |
492 | if (session->kernel_session == NULL) { | |
493 | continue; | |
494 | } | |
495 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
496 | if (channel->fd == fd) { | |
497 | DBG("Channel found, updating kernel streams"); | |
498 | ret = kernel_open_channel_stream(channel); | |
499 | if (ret < 0) { | |
500 | goto end; | |
501 | } | |
502 | /* | |
503 | * Have we already sent fds to the consumer? If yes, it means that | |
504 | * tracing is started so it is safe to send our updated stream fds. | |
505 | */ | |
506 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
507 | ret = send_kconsumerd_channel_fds(kconsumerd_cmd_sock, channel); | |
508 | if (ret < 0) { | |
509 | goto end; | |
510 | } | |
511 | } | |
512 | goto end; | |
513 | } | |
514 | } | |
515 | } | |
516 | ||
517 | end: | |
518 | return ret; | |
519 | } | |
520 | ||
521 | /* | |
522 | * thread_manage_kernel | |
523 | * | |
524 | * This thread manage event coming from the kernel. | |
525 | * | |
526 | * Features supported in this thread: | |
527 | * -) CPU Hotplug | |
528 | */ | |
529 | static void *thread_manage_kernel(void *data) | |
530 | { | |
531 | int ret, i, nb_fd = 0; | |
532 | char tmp; | |
533 | int update_poll_flag = 1; | |
534 | ||
535 | DBG("Thread manage kernel started"); | |
536 | ||
537 | while (1) { | |
538 | if (update_poll_flag == 1) { | |
539 | nb_fd = update_kernel_pollfd(); | |
540 | if (nb_fd < 0) { | |
541 | goto error; | |
542 | } | |
543 | update_poll_flag = 0; | |
544 | } | |
545 | ||
546 | DBG("Polling on %d fds", nb_fd); | |
547 | ||
548 | /* Poll infinite value of time */ | |
549 | ret = poll(kernel_pollfd, nb_fd, -1); | |
550 | if (ret < 0) { | |
551 | perror("poll kernel thread"); | |
552 | goto error; | |
553 | } else if (ret == 0) { | |
554 | /* Should not happen since timeout is infinite */ | |
555 | continue; | |
556 | } | |
557 | ||
558 | DBG("Kernel poll event triggered"); | |
559 | ||
560 | /* | |
561 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
562 | * must be updated. | |
563 | */ | |
564 | if (kernel_pollfd[nb_fd - 1].revents == POLLIN) { | |
565 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
566 | update_poll_flag = 1; | |
567 | continue; | |
568 | } | |
569 | ||
570 | for (i = 0; i < nb_fd; i++) { | |
571 | switch (kernel_pollfd[i].revents) { | |
572 | /* | |
573 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
574 | * session and updating the kernel consumer | |
575 | */ | |
576 | case POLLIN | POLLRDNORM: | |
577 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
578 | if (ret < 0) { | |
579 | continue; | |
580 | } | |
581 | break; | |
582 | } | |
583 | } | |
584 | } | |
585 | ||
586 | error: | |
587 | DBG("Kernel thread dying"); | |
588 | if (kernel_pollfd) { | |
589 | free(kernel_pollfd); | |
590 | } | |
591 | return NULL; | |
592 | } | |
593 | ||
1d4b027a DG |
594 | /* |
595 | * thread_manage_kconsumerd | |
596 | * | |
597 | * This thread manage the kconsumerd error sent | |
598 | * back to the session daemon. | |
599 | */ | |
600 | static void *thread_manage_kconsumerd(void *data) | |
601 | { | |
602 | int sock, ret; | |
603 | enum lttcomm_return_code code; | |
604 | ||
605 | DBG("[thread] Manage kconsumerd started"); | |
606 | ||
607 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
608 | if (ret < 0) { | |
609 | goto error; | |
610 | } | |
611 | ||
612 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); | |
613 | if (sock < 0) { | |
614 | goto error; | |
615 | } | |
616 | ||
712ea556 | 617 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
618 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
619 | if (ret <= 0) { | |
620 | goto error; | |
621 | } | |
622 | ||
623 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
624 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
625 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 626 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
627 | perror("kconsumerd connect"); |
628 | goto error; | |
629 | } | |
630 | /* Signal condition to tell that the kconsumerd is ready */ | |
631 | sem_post(&kconsumerd_sem); | |
632 | DBG("Kconsumerd command socket ready"); | |
633 | } else { | |
6f61d021 | 634 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
635 | lttcomm_get_readable_code(-code)); |
636 | goto error; | |
637 | } | |
638 | ||
712ea556 DG |
639 | /* Wait for any kconsumerd error */ |
640 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
641 | if (ret <= 0) { | |
642 | ERR("Kconsumerd closed the command socket"); | |
643 | goto error; | |
6f61d021 | 644 | } |
1d4b027a | 645 | |
712ea556 DG |
646 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
647 | ||
1d4b027a DG |
648 | error: |
649 | kconsumerd_pid = 0; | |
6f61d021 | 650 | DBG("Kconsumerd thread dying"); |
1d4b027a DG |
651 | return NULL; |
652 | } | |
653 | ||
654 | /* | |
655 | * thread_manage_apps | |
656 | * | |
657 | * This thread manage the application socket communication | |
658 | */ | |
659 | static void *thread_manage_apps(void *data) | |
660 | { | |
661 | int sock, ret; | |
662 | ||
663 | /* TODO: Something more elegant is needed but fine for now */ | |
664 | /* FIXME: change all types to either uint8_t, uint32_t, uint64_t | |
665 | * for 32-bit vs 64-bit compat processes. */ | |
666 | /* replicate in ust with version number */ | |
667 | struct { | |
668 | int reg; /* 1:register, 0:unregister */ | |
669 | pid_t pid; | |
670 | uid_t uid; | |
671 | } reg_msg; | |
672 | ||
673 | DBG("[thread] Manage apps started"); | |
674 | ||
675 | ret = lttcomm_listen_unix_sock(apps_sock); | |
676 | if (ret < 0) { | |
677 | goto error; | |
678 | } | |
679 | ||
680 | /* Notify all applications to register */ | |
681 | notify_apps(default_global_apps_pipe); | |
682 | ||
683 | while (1) { | |
684 | DBG("Accepting application registration"); | |
685 | /* Blocking call, waiting for transmission */ | |
686 | sock = lttcomm_accept_unix_sock(apps_sock); | |
687 | if (sock < 0) { | |
688 | goto error; | |
689 | } | |
690 | ||
691 | /* Basic recv here to handle the very simple data | |
692 | * that the libust send to register (reg_msg). | |
693 | */ | |
694 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
695 | if (ret < 0) { | |
696 | perror("recv"); | |
697 | continue; | |
698 | } | |
699 | ||
700 | /* Add application to the global traceable list */ | |
701 | if (reg_msg.reg == 1) { | |
702 | /* Registering */ | |
703 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); | |
704 | if (ret < 0) { | |
705 | /* register_traceable_app only return an error with | |
706 | * ENOMEM. At this point, we better stop everything. | |
707 | */ | |
708 | goto error; | |
709 | } | |
710 | } else { | |
711 | /* Unregistering */ | |
712 | unregister_traceable_app(reg_msg.pid); | |
713 | } | |
714 | } | |
715 | ||
716 | error: | |
717 | ||
718 | return NULL; | |
719 | } | |
720 | ||
8c0faa1d | 721 | /* |
693bd40b | 722 | * spawn_kconsumerd_thread |
8c0faa1d DG |
723 | * |
724 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd | |
725 | * exec or it will fails. | |
726 | */ | |
693bd40b | 727 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
728 | { |
729 | int ret; | |
730 | ||
731 | /* Setup semaphore */ | |
732 | sem_init(&kconsumerd_sem, 0, 0); | |
733 | ||
1d4b027a | 734 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
735 | if (ret != 0) { |
736 | perror("pthread_create kconsumerd"); | |
737 | goto error; | |
738 | } | |
739 | ||
693bd40b | 740 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
741 | sem_wait(&kconsumerd_sem); |
742 | ||
712ea556 DG |
743 | if (kconsumerd_pid == 0) { |
744 | ERR("Kconsumerd did not start"); | |
745 | goto error; | |
746 | } | |
747 | ||
8c0faa1d DG |
748 | return 0; |
749 | ||
750 | error: | |
712ea556 | 751 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
752 | return ret; |
753 | } | |
754 | ||
755 | /* | |
693bd40b | 756 | * spawn_kconsumerd |
8c0faa1d | 757 | * |
693bd40b DG |
758 | * Fork and exec a kernel consumer daemon (kconsumerd). |
759 | * | |
760 | * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel | |
761 | * file descriptor using the libkernelctl or kernel-ctl functions. So, a | |
762 | * kernel consumer MUST only be spawned before creating a kernel session. | |
8c0faa1d DG |
763 | * |
764 | * Return pid if successful else -1. | |
765 | */ | |
693bd40b | 766 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
767 | { |
768 | int ret; | |
769 | pid_t pid; | |
770 | ||
c49dc785 DG |
771 | DBG("Spawning kconsumerd"); |
772 | ||
8c0faa1d DG |
773 | pid = fork(); |
774 | if (pid == 0) { | |
775 | /* | |
776 | * Exec kconsumerd. | |
777 | */ | |
2b1173d8 | 778 | execlp("ltt-kconsumerd", "ltt-kconsumerd", "--verbose", NULL); |
8c0faa1d DG |
779 | if (errno != 0) { |
780 | perror("kernel start consumer exec"); | |
781 | } | |
782 | exit(EXIT_FAILURE); | |
783 | } else if (pid > 0) { | |
784 | ret = pid; | |
785 | goto error; | |
786 | } else { | |
787 | perror("kernel start consumer fork"); | |
788 | ret = -errno; | |
789 | goto error; | |
790 | } | |
791 | ||
792 | error: | |
793 | return ret; | |
794 | } | |
795 | ||
693bd40b DG |
796 | /* |
797 | * start_kconsumerd | |
798 | * | |
799 | * Spawn the kconsumerd daemon and session daemon thread. | |
800 | */ | |
801 | static int start_kconsumerd(void) | |
802 | { | |
803 | int ret; | |
804 | ||
693bd40b | 805 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 DG |
806 | if (kconsumerd_pid != 0) { |
807 | goto end; | |
808 | } | |
693bd40b | 809 | |
c49dc785 DG |
810 | ret = spawn_kconsumerd(); |
811 | if (ret < 0) { | |
812 | ERR("Spawning kconsumerd failed"); | |
813 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
814 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
815 | goto error; | |
693bd40b | 816 | } |
c49dc785 DG |
817 | |
818 | /* Setting up the global kconsumerd_pid */ | |
819 | kconsumerd_pid = ret; | |
693bd40b DG |
820 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
821 | ||
6f61d021 DG |
822 | DBG("Kconsumerd pid %d", ret); |
823 | ||
693bd40b | 824 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
825 | ret = spawn_kconsumerd_thread(); |
826 | if (ret < 0) { | |
827 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
828 | goto error; |
829 | } | |
830 | ||
c49dc785 DG |
831 | end: |
832 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
693bd40b DG |
833 | return 0; |
834 | ||
835 | error: | |
836 | return ret; | |
837 | } | |
838 | ||
b73401da DG |
839 | /* |
840 | * modprobe_kernel_modules | |
841 | */ | |
842 | static int modprobe_kernel_modules(void) | |
843 | { | |
844 | int ret = 0, i = 0; | |
845 | char modprobe[256]; | |
846 | ||
847 | while (kernel_modules_list[i] != NULL) { | |
848 | ret = snprintf(modprobe, sizeof(modprobe), "/sbin/modprobe %s", | |
849 | kernel_modules_list[i]); | |
850 | if (ret < 0) { | |
851 | perror("snprintf modprobe"); | |
852 | goto error; | |
853 | } | |
854 | ret = system(modprobe); | |
855 | if (ret < 0) { | |
856 | ERR("Unable to load module %s", kernel_modules_list[i]); | |
857 | } | |
858 | DBG("Modprobe successfully %s", kernel_modules_list[i]); | |
859 | i++; | |
860 | } | |
861 | ||
862 | error: | |
863 | return ret; | |
864 | } | |
865 | ||
866 | /* | |
867 | * mount_debugfs | |
868 | */ | |
869 | static int mount_debugfs(char *path) | |
870 | { | |
871 | int ret; | |
872 | char *type = "debugfs"; | |
873 | ||
874 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG); | |
875 | if (ret < 0) { | |
876 | goto error; | |
877 | } | |
878 | ||
879 | ret = mount(type, path, type, 0, NULL); | |
880 | if (ret < 0) { | |
881 | perror("mount debugfs"); | |
882 | goto error; | |
883 | } | |
884 | ||
885 | DBG("Mounted debugfs successfully at %s", path); | |
886 | ||
887 | error: | |
888 | return ret; | |
889 | } | |
890 | ||
8c0faa1d | 891 | /* |
f3ed775e | 892 | * init_kernel_tracer |
8c0faa1d | 893 | * |
f3ed775e | 894 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 895 | */ |
f3ed775e | 896 | static void init_kernel_tracer(void) |
8c0faa1d | 897 | { |
b73401da DG |
898 | int ret; |
899 | char *proc_mounts = "/proc/mounts"; | |
900 | char line[256]; | |
901 | char *debugfs_path = NULL, *lttng_path; | |
902 | FILE *fp; | |
903 | ||
904 | /* Detect debugfs */ | |
905 | fp = fopen(proc_mounts, "r"); | |
906 | if (fp == NULL) { | |
907 | ERR("Unable to probe %s", proc_mounts); | |
908 | goto error; | |
909 | } | |
910 | ||
911 | while (fgets(line, sizeof(line), fp) != NULL) { | |
912 | if (strstr(line, "debugfs") != NULL) { | |
913 | /* Remove first string */ | |
914 | strtok(line, " "); | |
915 | /* Dup string here so we can reuse line later on */ | |
916 | debugfs_path = strdup(strtok(NULL, " ")); | |
917 | DBG("Got debugfs path : %s", debugfs_path); | |
918 | break; | |
919 | } | |
920 | } | |
921 | ||
922 | fclose(fp); | |
923 | ||
924 | /* Mount debugfs if needded */ | |
925 | if (debugfs_path == NULL) { | |
926 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
927 | if (ret < 0) { | |
928 | perror("asprintf debugfs path"); | |
929 | goto error; | |
930 | } | |
931 | ret = mount_debugfs(debugfs_path); | |
932 | if (ret < 0) { | |
933 | goto error; | |
934 | } | |
935 | } | |
936 | ||
937 | /* Modprobe lttng kernel modules */ | |
938 | ret = modprobe_kernel_modules(); | |
939 | if (ret < 0) { | |
940 | goto error; | |
941 | } | |
942 | ||
943 | /* Setup lttng kernel path */ | |
944 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
945 | if (ret < 0) { | |
946 | perror("asprintf lttng path"); | |
947 | goto error; | |
948 | } | |
949 | ||
950 | /* Open debugfs lttng */ | |
951 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 952 | if (kernel_tracer_fd < 0) { |
b73401da DG |
953 | DBG("Failed to open %s", lttng_path); |
954 | goto error; | |
8c0faa1d DG |
955 | } |
956 | ||
b73401da DG |
957 | free(lttng_path); |
958 | free(debugfs_path); | |
f3ed775e | 959 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
960 | return; |
961 | ||
962 | error: | |
963 | if (lttng_path) { | |
964 | free(lttng_path); | |
965 | } | |
966 | if (debugfs_path) { | |
967 | free(debugfs_path); | |
968 | } | |
969 | WARN("No kernel tracer available"); | |
970 | kernel_tracer_fd = 0; | |
971 | return; | |
f3ed775e | 972 | } |
33a2b854 | 973 | |
f3ed775e DG |
974 | /* |
975 | * start_kernel_trace | |
976 | * | |
977 | * Start tracing by creating trace directory and sending FDs to the kernel | |
978 | * consumer. | |
979 | */ | |
980 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
981 | { | |
982 | int ret; | |
8c0faa1d | 983 | |
f3ed775e DG |
984 | if (session->kconsumer_fds_sent == 0) { |
985 | ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session); | |
986 | if (ret < 0) { | |
987 | ERR("Send kconsumerd fds failed"); | |
988 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
989 | goto error; | |
990 | } | |
1d4b027a | 991 | |
f3ed775e DG |
992 | session->kconsumer_fds_sent = 1; |
993 | } | |
1d4b027a DG |
994 | |
995 | error: | |
996 | return ret; | |
8c0faa1d DG |
997 | } |
998 | ||
7a485870 DG |
999 | /* |
1000 | * Notify kernel thread to update it's pollfd. | |
1001 | */ | |
1002 | static int notify_kernel_pollfd(void) | |
1003 | { | |
1004 | int ret; | |
1005 | ||
1006 | /* Inform kernel thread of the new kernel channel */ | |
1007 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1008 | if (ret < 0) { | |
1009 | perror("write kernel poll pipe"); | |
1010 | } | |
1011 | ||
1012 | return ret; | |
1013 | } | |
1014 | ||
8c0faa1d | 1015 | /* |
f3ed775e | 1016 | * init_default_channel |
8c0faa1d | 1017 | * |
f3ed775e | 1018 | * Allocate a channel structure and fill it. |
8c0faa1d | 1019 | */ |
f3ed775e | 1020 | static struct lttng_channel *init_default_channel(void) |
8c0faa1d | 1021 | { |
f3ed775e | 1022 | struct lttng_channel *chan; |
1d4b027a | 1023 | |
f3ed775e DG |
1024 | chan = malloc(sizeof(struct lttng_channel)); |
1025 | if (chan == NULL) { | |
1026 | perror("init channel malloc"); | |
1027 | goto error; | |
8c0faa1d | 1028 | } |
1d4b027a | 1029 | |
f3ed775e DG |
1030 | if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) { |
1031 | perror("snprintf defautl channel name"); | |
1032 | return NULL; | |
1033 | } | |
1034 | ||
1035 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1036 | chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; | |
1037 | chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; | |
1038 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
1039 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 1040 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
1d4b027a DG |
1041 | |
1042 | error: | |
f3ed775e | 1043 | return chan; |
8c0faa1d DG |
1044 | } |
1045 | ||
333f285e | 1046 | /* |
f3ed775e | 1047 | * create_kernel_session |
333f285e | 1048 | * |
f3ed775e | 1049 | * Create a kernel tracer session then create the default channel. |
333f285e | 1050 | */ |
f3ed775e | 1051 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1052 | { |
f3ed775e DG |
1053 | int ret; |
1054 | struct lttng_channel *chan; | |
1055 | ||
1056 | DBG("Creating kernel session"); | |
1057 | ||
1058 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1059 | if (ret < 0) { | |
1060 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1061 | goto error; | |
333f285e DG |
1062 | } |
1063 | ||
f3ed775e DG |
1064 | chan = init_default_channel(); |
1065 | if (chan == NULL) { | |
1066 | ret = LTTCOMM_FATAL; | |
1067 | goto error; | |
1068 | } | |
1069 | ||
7a485870 DG |
1070 | ret = mkdir_recursive(session->path, S_IRWXU | S_IRWXG ); |
1071 | if (ret < 0) { | |
1072 | if (ret != EEXIST) { | |
1073 | ERR("Trace directory creation error"); | |
1074 | goto error; | |
1075 | } | |
1076 | } | |
1077 | ||
f3ed775e DG |
1078 | DBG("Creating default kernel channel %s", DEFAULT_CHANNEL_NAME); |
1079 | ||
b082db07 | 1080 | ret = kernel_create_channel(session->kernel_session, chan, session->path); |
f3ed775e DG |
1081 | if (ret < 0) { |
1082 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1083 | goto error; | |
1084 | } | |
1085 | ||
7a485870 DG |
1086 | ret = notify_kernel_pollfd(); |
1087 | ||
f3ed775e DG |
1088 | error: |
1089 | return ret; | |
333f285e DG |
1090 | } |
1091 | ||
fac6795d DG |
1092 | /* |
1093 | * process_client_msg | |
1094 | * | |
5461b305 DG |
1095 | * Process the command requested by the lttng client within the command |
1096 | * context structure. This function make sure that the return structure (llm) | |
1097 | * is set and ready for transmission before returning. | |
fac6795d | 1098 | * |
e065084a | 1099 | * Return any error encountered or 0 for success. |
fac6795d | 1100 | */ |
5461b305 | 1101 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1102 | { |
5461b305 | 1103 | int ret; |
fac6795d | 1104 | |
5461b305 | 1105 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1106 | |
f3ed775e | 1107 | /* Listing commands don't need a session */ |
5461b305 | 1108 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1109 | case LTTNG_CREATE_SESSION: |
1110 | case LTTNG_LIST_SESSIONS: | |
f3ed775e DG |
1111 | case LTTNG_LIST_EVENTS: |
1112 | case LTTNG_KERNEL_LIST_EVENTS: | |
1113 | case LTTNG_LIST_TRACEABLE_APPS: | |
5e16da05 MD |
1114 | break; |
1115 | default: | |
f3ed775e DG |
1116 | DBG("Getting session %s by name", cmd_ctx->lsm->session_name); |
1117 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name); | |
5461b305 | 1118 | if (cmd_ctx->session == NULL) { |
f3ed775e DG |
1119 | /* If session name not found */ |
1120 | if (cmd_ctx->lsm->session_name != NULL) { | |
1121 | ret = LTTCOMM_SESS_NOT_FOUND; | |
1122 | } else { /* If no session name specified */ | |
1123 | ret = LTTCOMM_SELECT_SESS; | |
1124 | } | |
5461b305 | 1125 | goto error; |
379473d2 | 1126 | } |
5e16da05 | 1127 | break; |
379473d2 DG |
1128 | } |
1129 | ||
f3ed775e DG |
1130 | /* |
1131 | * Check kernel command for kernel session. | |
1132 | */ | |
20fe2104 | 1133 | switch (cmd_ctx->lsm->cmd_type) { |
d65106b1 | 1134 | case LTTNG_KERNEL_ADD_CONTEXT: |
f3ed775e DG |
1135 | case LTTNG_KERNEL_CREATE_CHANNEL: |
1136 | case LTTNG_KERNEL_DISABLE_ALL_EVENT: | |
1137 | case LTTNG_KERNEL_DISABLE_CHANNEL: | |
1138 | case LTTNG_KERNEL_DISABLE_EVENT: | |
1139 | case LTTNG_KERNEL_ENABLE_ALL_EVENT: | |
1140 | case LTTNG_KERNEL_ENABLE_CHANNEL: | |
1141 | case LTTNG_KERNEL_ENABLE_EVENT: | |
1142 | case LTTNG_KERNEL_LIST_EVENTS: | |
333f285e | 1143 | /* Kernel tracer check */ |
20fe2104 | 1144 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1145 | init_kernel_tracer(); |
1146 | if (kernel_tracer_fd == 0) { | |
1147 | ret = LTTCOMM_KERN_NA; | |
1148 | goto error; | |
1149 | } | |
20fe2104 | 1150 | } |
f3ed775e DG |
1151 | |
1152 | /* Need a session for kernel command */ | |
1153 | if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS && | |
1154 | cmd_ctx->session->kernel_session == NULL) { | |
7b395890 | 1155 | |
f3ed775e DG |
1156 | ret = create_kernel_session(cmd_ctx->session); |
1157 | if (ret < 0) { | |
1158 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1159 | goto error; | |
1160 | } | |
1161 | ||
7b395890 | 1162 | /* Start the kernel consumer daemon */ |
f3ed775e DG |
1163 | if (kconsumerd_pid == 0) { |
1164 | ret = start_kconsumerd(); | |
1165 | if (ret < 0) { | |
1166 | goto error; | |
1167 | } | |
1168 | } | |
1169 | } | |
20fe2104 DG |
1170 | } |
1171 | ||
471d1693 | 1172 | /* Connect to ust apps if available pid */ |
5461b305 | 1173 | if (cmd_ctx->lsm->pid > 0) { |
471d1693 | 1174 | /* Connect to app using ustctl API */ |
5461b305 DG |
1175 | cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid); |
1176 | if (cmd_ctx->ust_sock < 0) { | |
471d1693 | 1177 | ret = LTTCOMM_NO_TRACEABLE; |
5461b305 | 1178 | goto error; |
471d1693 DG |
1179 | } |
1180 | } | |
1181 | ||
fac6795d | 1182 | /* Process by command type */ |
5461b305 | 1183 | switch (cmd_ctx->lsm->cmd_type) { |
d65106b1 DG |
1184 | case LTTNG_KERNEL_ADD_CONTEXT: |
1185 | { | |
1186 | int found = 0, no_event = 0; | |
1187 | struct ltt_kernel_channel *chan; | |
1188 | struct ltt_kernel_event *event; | |
1189 | ||
1190 | /* Setup lttng message with no payload */ | |
1191 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1192 | if (ret < 0) { | |
1193 | goto setup_error; | |
1194 | } | |
1195 | ||
1196 | /* Check if event name is given */ | |
1197 | if (strlen(cmd_ctx->lsm->u.context.event_name) == 0) { | |
1198 | no_event = 1; | |
1199 | } | |
1200 | ||
1201 | if (strlen(cmd_ctx->lsm->u.context.channel_name) == 0) { | |
1202 | /* Go over all channels */ | |
1203 | DBG("Adding context to all channels"); | |
1204 | cds_list_for_each_entry(chan, | |
1205 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
1206 | if (no_event) { | |
1207 | ret = kernel_add_channel_context(chan, | |
1208 | &cmd_ctx->lsm->u.context.ctx); | |
1209 | if (ret < 0) { | |
1210 | continue; | |
1211 | } | |
1212 | } else { | |
1213 | event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan); | |
1214 | if (event != NULL) { | |
1215 | ret = kernel_add_event_context(event, | |
1216 | &cmd_ctx->lsm->u.context.ctx); | |
1217 | if (ret < 0) { | |
1218 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
1219 | goto error; | |
1220 | } | |
1221 | found = 1; | |
1222 | break; | |
1223 | } | |
1224 | } | |
1225 | } | |
1226 | } else { | |
1227 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.context.channel_name, | |
1228 | cmd_ctx->session->kernel_session); | |
1229 | if (chan == NULL) { | |
1230 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1231 | goto error; | |
1232 | } | |
1233 | ||
1234 | if (no_event) { | |
1235 | ret = kernel_add_channel_context(chan, | |
1236 | &cmd_ctx->lsm->u.context.ctx); | |
1237 | if (ret < 0) { | |
1238 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
1239 | goto error; | |
1240 | } | |
1241 | } else { | |
1242 | event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan); | |
1243 | if (event != NULL) { | |
1244 | ret = kernel_add_event_context(event, | |
1245 | &cmd_ctx->lsm->u.context.ctx); | |
1246 | if (ret < 0) { | |
1247 | ret = LTTCOMM_KERN_CONTEXT_FAIL; | |
1248 | goto error; | |
1249 | } | |
1250 | } | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | if (!found && !no_event) { | |
1255 | ret = LTTCOMM_NO_EVENT; | |
1256 | goto error; | |
1257 | } | |
1258 | ||
1259 | ret = LTTCOMM_OK; | |
1260 | break; | |
1261 | } | |
f3ed775e | 1262 | case LTTNG_KERNEL_CREATE_CHANNEL: |
20fe2104 | 1263 | { |
f3ed775e | 1264 | /* Setup lttng message with no payload */ |
20fe2104 DG |
1265 | ret = setup_lttng_msg(cmd_ctx, 0); |
1266 | if (ret < 0) { | |
1267 | goto setup_error; | |
1268 | } | |
1269 | ||
f3ed775e | 1270 | /* Kernel tracer */ |
8c0faa1d DG |
1271 | DBG("Creating kernel channel"); |
1272 | ||
f3ed775e | 1273 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
b082db07 | 1274 | &cmd_ctx->lsm->u.channel.chan, cmd_ctx->session->path); |
20fe2104 DG |
1275 | if (ret < 0) { |
1276 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1277 | goto error; | |
1278 | } | |
1279 | ||
7a485870 DG |
1280 | ret = notify_kernel_pollfd(); |
1281 | if (ret < 0) { | |
1282 | ret = LTTCOMM_FATAL; | |
1283 | goto error; | |
1284 | } | |
1285 | ||
20fe2104 DG |
1286 | ret = LTTCOMM_OK; |
1287 | break; | |
1288 | } | |
26cc6b4e DG |
1289 | case LTTNG_KERNEL_DISABLE_CHANNEL: |
1290 | { | |
1291 | struct ltt_kernel_channel *chan; | |
1292 | ||
1293 | /* Setup lttng message with no payload */ | |
1294 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1295 | if (ret < 0) { | |
1296 | goto setup_error; | |
1297 | } | |
1298 | ||
1299 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1300 | cmd_ctx->session->kernel_session); | |
1301 | if (chan == NULL) { | |
1302 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1303 | goto error; | |
1304 | } else if (chan->enabled == 1) { | |
1305 | ret = kernel_disable_channel(chan); | |
1306 | if (ret < 0) { | |
1307 | if (ret != EEXIST) { | |
1308 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1309 | } | |
1310 | goto error; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | kernel_wait_quiescent(kernel_tracer_fd); | |
1315 | ret = LTTCOMM_OK; | |
1316 | break; | |
1317 | } | |
e953ef25 DG |
1318 | case LTTNG_KERNEL_DISABLE_EVENT: |
1319 | { | |
e953ef25 | 1320 | struct ltt_kernel_channel *chan; |
19e70852 | 1321 | struct ltt_kernel_event *ev; |
e953ef25 DG |
1322 | |
1323 | /* Setup lttng message with no payload */ | |
1324 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1325 | if (ret < 0) { | |
1326 | goto setup_error; | |
1327 | } | |
1328 | ||
19e70852 DG |
1329 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
1330 | cmd_ctx->session->kernel_session); | |
1331 | if (chan == NULL) { | |
1332 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1333 | goto error; | |
1334 | } | |
e953ef25 | 1335 | |
19e70852 DG |
1336 | ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan); |
1337 | if (ev != NULL) { | |
1338 | DBG("Disabling kernel event %s for channel %s.", | |
1339 | cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name); | |
1340 | ret = kernel_disable_event(ev); | |
1341 | if (ret < 0) { | |
1342 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1343 | goto error; | |
e953ef25 DG |
1344 | } |
1345 | } | |
1346 | ||
19e70852 DG |
1347 | kernel_wait_quiescent(kernel_tracer_fd); |
1348 | ret = LTTCOMM_OK; | |
e953ef25 DG |
1349 | break; |
1350 | } | |
950131af DG |
1351 | case LTTNG_KERNEL_DISABLE_ALL_EVENT: |
1352 | { | |
1353 | struct ltt_kernel_channel *chan; | |
1354 | struct ltt_kernel_event *ev; | |
1355 | ||
1356 | /* Setup lttng message with no payload */ | |
1357 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1358 | if (ret < 0) { | |
1359 | goto setup_error; | |
1360 | } | |
1361 | ||
1362 | DBG("Disabling all enabled kernel events"); | |
1363 | ||
1364 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1365 | cmd_ctx->session->kernel_session); | |
1366 | if (chan == NULL) { | |
1367 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1368 | goto error; | |
1369 | } | |
1370 | ||
1371 | /* For each event in the kernel session */ | |
1372 | cds_list_for_each_entry(ev, &chan->events_list.head, list) { | |
1373 | DBG("Disabling kernel event %s for channel %s.", | |
1374 | ev->event->name, cmd_ctx->lsm->u.disable.channel_name); | |
1375 | ret = kernel_disable_event(ev); | |
1376 | if (ret < 0) { | |
1377 | continue; | |
1378 | } | |
1379 | } | |
1380 | ||
1381 | /* Quiescent wait after event disable */ | |
1382 | kernel_wait_quiescent(kernel_tracer_fd); | |
1383 | ret = LTTCOMM_OK; | |
1384 | break; | |
1385 | } | |
d36b8583 DG |
1386 | case LTTNG_KERNEL_ENABLE_CHANNEL: |
1387 | { | |
1388 | struct ltt_kernel_channel *chan; | |
1389 | ||
1390 | /* Setup lttng message with no payload */ | |
1391 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1392 | if (ret < 0) { | |
1393 | goto setup_error; | |
1394 | } | |
1395 | ||
1396 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, | |
1397 | cmd_ctx->session->kernel_session); | |
1398 | if (chan == NULL) { | |
1399 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1400 | goto error; | |
1401 | } else if (chan->enabled == 0) { | |
1402 | ret = kernel_enable_channel(chan); | |
1403 | if (ret < 0) { | |
1404 | if (ret != EEXIST) { | |
1405 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
1406 | } | |
1407 | goto error; | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | kernel_wait_quiescent(kernel_tracer_fd); | |
1412 | ret = LTTCOMM_OK; | |
1413 | break; | |
1414 | } | |
f3ed775e | 1415 | case LTTNG_KERNEL_ENABLE_EVENT: |
894be886 | 1416 | { |
f3ed775e | 1417 | struct ltt_kernel_channel *chan; |
19e70852 | 1418 | struct ltt_kernel_event *ev; |
f3ed775e | 1419 | |
894be886 DG |
1420 | /* Setup lttng message with no payload */ |
1421 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1422 | if (ret < 0) { | |
1423 | goto setup_error; | |
1424 | } | |
1425 | ||
19e70852 DG |
1426 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, |
1427 | cmd_ctx->session->kernel_session); | |
1428 | if (chan == NULL) { | |
1429 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1430 | goto error; | |
f34daff7 DG |
1431 | } |
1432 | ||
19e70852 DG |
1433 | ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, chan); |
1434 | if (ev == NULL) { | |
1435 | DBG("Creating kernel event %s for channel %s.", | |
950131af | 1436 | cmd_ctx->lsm->u.enable.event.name, chan->channel->name); |
19e70852 | 1437 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, chan); |
f3ed775e | 1438 | } else { |
19e70852 | 1439 | DBG("Enabling kernel event %s for channel %s.", |
950131af | 1440 | cmd_ctx->lsm->u.enable.event.name, chan->channel->name); |
19e70852 DG |
1441 | ret = kernel_enable_event(ev); |
1442 | } | |
1443 | ||
1444 | if (ret < 0) { | |
1445 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1446 | goto error; | |
f3ed775e | 1447 | } |
19e70852 DG |
1448 | |
1449 | kernel_wait_quiescent(kernel_tracer_fd); | |
1450 | ret = LTTCOMM_OK; | |
894be886 DG |
1451 | break; |
1452 | } | |
f3ed775e | 1453 | case LTTNG_KERNEL_ENABLE_ALL_EVENT: |
33a2b854 | 1454 | { |
950131af | 1455 | int pos, size; |
33a2b854 | 1456 | char *event_list, *event, *ptr; |
f3ed775e | 1457 | struct ltt_kernel_channel *chan; |
950131af DG |
1458 | struct ltt_kernel_event *ev; |
1459 | struct lttng_event ev_attr; | |
33a2b854 DG |
1460 | |
1461 | /* Setup lttng message with no payload */ | |
1462 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1463 | if (ret < 0) { | |
1464 | goto setup_error; | |
1465 | } | |
1466 | ||
1467 | DBG("Enabling all kernel event"); | |
1468 | ||
950131af DG |
1469 | chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, |
1470 | cmd_ctx->session->kernel_session); | |
1471 | if (chan == NULL) { | |
1472 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
33a2b854 DG |
1473 | goto error; |
1474 | } | |
1475 | ||
950131af DG |
1476 | /* For each event in the kernel session */ |
1477 | cds_list_for_each_entry(ev, &chan->events_list.head, list) { | |
1478 | DBG("Enabling kernel event %s for channel %s.", | |
1479 | ev->event->name, chan->channel->name); | |
1480 | ret = kernel_enable_event(ev); | |
1481 | if (ret < 0) { | |
1482 | continue; | |
f3ed775e DG |
1483 | } |
1484 | } | |
1485 | ||
950131af DG |
1486 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
1487 | if (size < 0) { | |
1488 | ret = LTTCOMM_KERN_LIST_FAIL; | |
f3ed775e DG |
1489 | goto error; |
1490 | } | |
1491 | ||
33a2b854 DG |
1492 | ptr = event_list; |
1493 | while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { | |
950131af DG |
1494 | ev = get_kernel_event_by_name(event, chan); |
1495 | if (ev == NULL) { | |
1496 | strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN); | |
1497 | /* Default event type for enable all */ | |
1498 | ev_attr.type = LTTNG_EVENT_TRACEPOINTS; | |
1499 | /* Enable each single tracepoint event */ | |
1500 | ret = kernel_create_event(&ev_attr, chan); | |
1501 | if (ret < 0) { | |
1502 | /* Ignore error here and continue */ | |
950131af | 1503 | } |
33a2b854 | 1504 | } |
950131af | 1505 | |
33a2b854 DG |
1506 | /* Move pointer to the next line */ |
1507 | ptr += pos + 1; | |
1508 | free(event); | |
1509 | } | |
1510 | ||
1511 | free(event_list); | |
1512 | ||
f3ed775e DG |
1513 | /* Quiescent wait after event enable */ |
1514 | kernel_wait_quiescent(kernel_tracer_fd); | |
33a2b854 DG |
1515 | ret = LTTCOMM_OK; |
1516 | break; | |
1517 | } | |
f3ed775e | 1518 | case LTTNG_KERNEL_LIST_EVENTS: |
2ef84c95 DG |
1519 | { |
1520 | char *event_list; | |
f3ed775e DG |
1521 | ssize_t size = 0; |
1522 | ||
1523 | DBG("Listing kernel events"); | |
2ef84c95 DG |
1524 | |
1525 | size = kernel_list_events(kernel_tracer_fd, &event_list); | |
1526 | if (size < 0) { | |
1527 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1528 | goto error; | |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * Setup lttng message with payload size set to the event list size in | |
1533 | * bytes and then copy list into the llm payload. | |
1534 | */ | |
1535 | ret = setup_lttng_msg(cmd_ctx, size); | |
1536 | if (ret < 0) { | |
1537 | goto setup_error; | |
1538 | } | |
1539 | ||
1540 | /* Copy event list into message payload */ | |
1541 | memcpy(cmd_ctx->llm->payload, event_list, size); | |
1542 | ||
1543 | free(event_list); | |
1544 | ||
1545 | ret = LTTCOMM_OK; | |
1546 | break; | |
1547 | } | |
f3ed775e | 1548 | case LTTNG_START_TRACE: |
8c0faa1d DG |
1549 | { |
1550 | struct ltt_kernel_channel *chan; | |
f3ed775e | 1551 | |
8c0faa1d DG |
1552 | /* Setup lttng message with no payload */ |
1553 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1554 | if (ret < 0) { | |
1555 | goto setup_error; | |
1556 | } | |
1557 | ||
f3ed775e DG |
1558 | /* Kernel tracing */ |
1559 | if (cmd_ctx->session->kernel_session != NULL) { | |
1560 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
1561 | DBG("Open kernel metadata"); | |
58a97671 DG |
1562 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
1563 | cmd_ctx->session->path); | |
f3ed775e DG |
1564 | if (ret < 0) { |
1565 | ret = LTTCOMM_KERN_META_FAIL; | |
1566 | goto error; | |
1567 | } | |
1568 | } | |
8c0faa1d | 1569 | |
f3ed775e DG |
1570 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
1571 | DBG("Opening kernel metadata stream"); | |
1572 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
1573 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
1574 | if (ret < 0) { | |
1575 | ERR("Kernel create metadata stream failed"); | |
1576 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1577 | goto error; | |
1578 | } | |
1579 | } | |
1580 | } | |
8c0faa1d | 1581 | |
f3ed775e DG |
1582 | /* For each channel */ |
1583 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
1584 | if (chan->stream_count == 0) { | |
1585 | ret = kernel_open_channel_stream(chan); | |
1586 | if (ret < 0) { | |
1587 | ERR("Kernel create channel stream failed"); | |
1588 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1589 | goto error; | |
1590 | } | |
1591 | /* Update the stream global counter */ | |
1592 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
1593 | } | |
1594 | } | |
1595 | ||
1596 | DBG("Start kernel tracing"); | |
1597 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
8c0faa1d | 1598 | if (ret < 0) { |
f3ed775e DG |
1599 | ERR("Kernel start session failed"); |
1600 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1601 | goto error; |
1602 | } | |
8c0faa1d | 1603 | |
f3ed775e DG |
1604 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
1605 | if (ret < 0) { | |
1606 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1607 | goto error; |
1608 | } | |
8c0faa1d | 1609 | |
f3ed775e DG |
1610 | /* Quiescent wait after starting trace */ |
1611 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1612 | } |
1613 | ||
f3ed775e | 1614 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
1615 | |
1616 | ret = LTTCOMM_OK; | |
1617 | break; | |
1618 | } | |
f3ed775e | 1619 | case LTTNG_STOP_TRACE: |
8c0faa1d | 1620 | { |
f3ed775e | 1621 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
1622 | /* Setup lttng message with no payload */ |
1623 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1624 | if (ret < 0) { | |
1625 | goto setup_error; | |
1626 | } | |
1627 | ||
f3ed775e DG |
1628 | /* Kernel tracer */ |
1629 | if (cmd_ctx->session->kernel_session != NULL) { | |
1630 | DBG("Stop kernel tracing"); | |
84291629 | 1631 | |
f3ed775e DG |
1632 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
1633 | if (ret < 0) { | |
1634 | ERR("Kernel metadata flush failed"); | |
1635 | } | |
8c0faa1d | 1636 | |
f3ed775e DG |
1637 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
1638 | ret = kernel_flush_buffer(chan); | |
1639 | if (ret < 0) { | |
1640 | ERR("Kernel flush buffer error"); | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
1645 | if (ret < 0) { | |
1646 | ERR("Kernel stop session failed"); | |
1647 | ret = LTTCOMM_KERN_STOP_FAIL; | |
1648 | goto error; | |
1649 | } | |
1650 | ||
1651 | /* Quiescent wait after stopping trace */ | |
1652 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1653 | } |
1654 | ||
f3ed775e | 1655 | /* TODO : User-space tracer */ |
8c0faa1d DG |
1656 | |
1657 | ret = LTTCOMM_OK; | |
1658 | break; | |
1659 | } | |
5e16da05 MD |
1660 | case LTTNG_CREATE_SESSION: |
1661 | { | |
5461b305 DG |
1662 | /* Setup lttng message with no payload */ |
1663 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1664 | if (ret < 0) { | |
1665 | goto setup_error; | |
1666 | } | |
1667 | ||
f3ed775e | 1668 | ret = create_session(cmd_ctx->lsm->session_name, cmd_ctx->lsm->path); |
5e16da05 | 1669 | if (ret < 0) { |
f3ed775e | 1670 | if (ret == -EEXIST) { |
5e16da05 MD |
1671 | ret = LTTCOMM_EXIST_SESS; |
1672 | } else { | |
aaf97519 | 1673 | ret = LTTCOMM_FATAL; |
aaf97519 | 1674 | } |
5461b305 | 1675 | goto error; |
8028d920 | 1676 | } |
1657e9bb | 1677 | |
5461b305 | 1678 | ret = LTTCOMM_OK; |
5e16da05 MD |
1679 | break; |
1680 | } | |
1681 | case LTTNG_DESTROY_SESSION: | |
1682 | { | |
5461b305 DG |
1683 | /* Setup lttng message with no payload */ |
1684 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1685 | if (ret < 0) { | |
1686 | goto setup_error; | |
1687 | } | |
1688 | ||
f3ed775e DG |
1689 | /* Clean kernel session teardown */ |
1690 | teardown_kernel_session(cmd_ctx->session); | |
1691 | ||
1692 | ret = destroy_session(cmd_ctx->lsm->session_name); | |
5e16da05 | 1693 | if (ret < 0) { |
f3ed775e | 1694 | ret = LTTCOMM_FATAL; |
5461b305 | 1695 | goto error; |
5e16da05 | 1696 | } |
1657e9bb | 1697 | |
7a485870 DG |
1698 | /* |
1699 | * Must notify the kernel thread here to update it's pollfd in order to | |
1700 | * remove the channel(s)' fd just destroyed. | |
1701 | */ | |
1702 | ret = notify_kernel_pollfd(); | |
1703 | if (ret < 0) { | |
1704 | ret = LTTCOMM_FATAL; | |
1705 | goto error; | |
1706 | } | |
1707 | ||
5461b305 DG |
1708 | ret = LTTCOMM_OK; |
1709 | break; | |
5e16da05 | 1710 | } |
f3ed775e | 1711 | /* |
5e16da05 MD |
1712 | case LTTNG_LIST_TRACES: |
1713 | { | |
5461b305 | 1714 | unsigned int trace_count; |
1657e9bb | 1715 | |
5461b305 | 1716 | trace_count = get_trace_count_per_session(cmd_ctx->session); |
5e16da05 MD |
1717 | if (trace_count == 0) { |
1718 | ret = LTTCOMM_NO_TRACE; | |
5461b305 | 1719 | goto error; |
1657e9bb | 1720 | } |
df0da139 | 1721 | |
5461b305 DG |
1722 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count); |
1723 | if (ret < 0) { | |
1724 | goto setup_error; | |
df0da139 | 1725 | } |
ca95a216 | 1726 | |
5461b305 DG |
1727 | get_traces_per_session(cmd_ctx->session, |
1728 | (struct lttng_trace *)(cmd_ctx->llm->payload)); | |
1729 | ||
1730 | ret = LTTCOMM_OK; | |
5e16da05 MD |
1731 | break; |
1732 | } | |
f3ed775e DG |
1733 | */ |
1734 | /* | |
5e16da05 MD |
1735 | case UST_CREATE_TRACE: |
1736 | { | |
5461b305 | 1737 | ret = setup_lttng_msg(cmd_ctx, 0); |
5e16da05 | 1738 | if (ret < 0) { |
5461b305 | 1739 | goto setup_error; |
fac6795d | 1740 | } |
ce3d728c | 1741 | |
5461b305 DG |
1742 | ret = ust_create_trace(cmd_ctx); |
1743 | if (ret < 0) { | |
f3ed775e | 1744 | goto error; |
5461b305 DG |
1745 | } |
1746 | break; | |
5e16da05 | 1747 | } |
f3ed775e DG |
1748 | */ |
1749 | case LTTNG_LIST_TRACEABLE_APPS: | |
5e16da05 | 1750 | { |
5461b305 DG |
1751 | unsigned int app_count; |
1752 | ||
1753 | app_count = get_app_count(); | |
1754 | DBG("Traceable application count : %d", app_count); | |
5e16da05 MD |
1755 | if (app_count == 0) { |
1756 | ret = LTTCOMM_NO_APPS; | |
5461b305 | 1757 | goto error; |
ce3d728c | 1758 | } |
520ff687 | 1759 | |
5461b305 DG |
1760 | ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count); |
1761 | if (ret < 0) { | |
1762 | goto setup_error; | |
520ff687 | 1763 | } |
57167058 | 1764 | |
5461b305 | 1765 | get_app_list_pids((pid_t *)(cmd_ctx->llm->payload)); |
5e16da05 | 1766 | |
5461b305 | 1767 | ret = LTTCOMM_OK; |
5e16da05 MD |
1768 | break; |
1769 | } | |
f3ed775e | 1770 | /* |
5e16da05 MD |
1771 | case UST_START_TRACE: |
1772 | { | |
5461b305 DG |
1773 | ret = setup_lttng_msg(cmd_ctx, 0); |
1774 | if (ret < 0) { | |
1775 | goto setup_error; | |
1776 | } | |
ca95a216 | 1777 | |
5461b305 DG |
1778 | ret = ust_start_trace(cmd_ctx); |
1779 | if (ret < 0) { | |
1780 | goto setup_error; | |
1781 | } | |
1782 | break; | |
5e16da05 MD |
1783 | } |
1784 | case UST_STOP_TRACE: | |
1785 | { | |
5461b305 DG |
1786 | ret = setup_lttng_msg(cmd_ctx, 0); |
1787 | if (ret < 0) { | |
1788 | goto setup_error; | |
1789 | } | |
ca95a216 | 1790 | |
5461b305 DG |
1791 | ret = ust_stop_trace(cmd_ctx); |
1792 | if (ret < 0) { | |
1793 | goto setup_error; | |
1794 | } | |
1795 | break; | |
5e16da05 | 1796 | } |
f3ed775e | 1797 | */ |
5e16da05 MD |
1798 | case LTTNG_LIST_SESSIONS: |
1799 | { | |
5461b305 DG |
1800 | unsigned int session_count; |
1801 | ||
1802 | session_count = get_session_count(); | |
5e16da05 | 1803 | if (session_count == 0) { |
f3ed775e | 1804 | ret = LTTCOMM_NO_SESSION; |
5461b305 | 1805 | goto error; |
57167058 | 1806 | } |
5e16da05 | 1807 | |
5461b305 DG |
1808 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count); |
1809 | if (ret < 0) { | |
1810 | goto setup_error; | |
e065084a | 1811 | } |
5e16da05 | 1812 | |
5461b305 | 1813 | get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload)); |
5e16da05 | 1814 | |
5461b305 | 1815 | ret = LTTCOMM_OK; |
5e16da05 MD |
1816 | break; |
1817 | } | |
1818 | default: | |
1819 | /* Undefined command */ | |
5461b305 DG |
1820 | ret = setup_lttng_msg(cmd_ctx, 0); |
1821 | if (ret < 0) { | |
1822 | goto setup_error; | |
1823 | } | |
1824 | ||
5e16da05 | 1825 | ret = LTTCOMM_UND; |
5461b305 | 1826 | break; |
fac6795d DG |
1827 | } |
1828 | ||
5461b305 DG |
1829 | /* Set return code */ |
1830 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 1831 | |
e065084a DG |
1832 | return ret; |
1833 | ||
5461b305 | 1834 | error: |
5461b305 DG |
1835 | if (cmd_ctx->llm == NULL) { |
1836 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 1837 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
1838 | goto setup_error; |
1839 | } | |
1840 | } | |
e065084a | 1841 | /* Notify client of error */ |
5461b305 | 1842 | cmd_ctx->llm->ret_code = ret; |
e065084a | 1843 | |
5461b305 | 1844 | setup_error: |
8028d920 | 1845 | return ret; |
fac6795d DG |
1846 | } |
1847 | ||
1d4b027a DG |
1848 | /* |
1849 | * thread_manage_clients | |
1850 | * | |
1851 | * This thread manage all clients request using the unix | |
1852 | * client socket for communication. | |
1853 | */ | |
1854 | static void *thread_manage_clients(void *data) | |
1855 | { | |
1856 | int sock, ret; | |
1857 | struct command_ctx *cmd_ctx; | |
1858 | ||
1859 | DBG("[thread] Manage client started"); | |
1860 | ||
1861 | ret = lttcomm_listen_unix_sock(client_sock); | |
1862 | if (ret < 0) { | |
1863 | goto error; | |
1864 | } | |
1865 | ||
1866 | /* Notify parent pid that we are ready | |
1867 | * to accept command for client side. | |
1868 | */ | |
1869 | if (opt_sig_parent) { | |
1870 | kill(ppid, SIGCHLD); | |
1871 | } | |
1872 | ||
1873 | while (1) { | |
1874 | /* Blocking call, waiting for transmission */ | |
1875 | DBG("Accepting client command ..."); | |
1876 | sock = lttcomm_accept_unix_sock(client_sock); | |
1877 | if (sock < 0) { | |
1878 | goto error; | |
1879 | } | |
1880 | ||
1881 | /* Allocate context command to process the client request */ | |
1882 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
1883 | ||
1884 | /* Allocate data buffer for reception */ | |
1885 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
1886 | cmd_ctx->llm = NULL; | |
1887 | cmd_ctx->session = NULL; | |
1888 | ||
1889 | /* | |
1890 | * Data is received from the lttng client. The struct | |
1891 | * lttcomm_session_msg (lsm) contains the command and data request of | |
1892 | * the client. | |
1893 | */ | |
1894 | DBG("Receiving data from client ..."); | |
1895 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
1896 | if (ret <= 0) { | |
1897 | continue; | |
1898 | } | |
1899 | ||
f7776ea7 DG |
1900 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
1901 | ||
1d4b027a DG |
1902 | /* |
1903 | * This function dispatch the work to the kernel or userspace tracer | |
1904 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
1905 | * informations for the client. The command context struct contains | |
1906 | * everything this function may needs. | |
1907 | */ | |
1908 | ret = process_client_msg(cmd_ctx); | |
1909 | if (ret < 0) { | |
1910 | /* TODO: Inform client somehow of the fatal error. At this point, | |
1911 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
1912 | /* Error detected but still accept command */ | |
1913 | clean_command_ctx(cmd_ctx); | |
1914 | continue; | |
1915 | } | |
1916 | ||
1917 | DBG("Sending response (size: %d, retcode: %d)", | |
1918 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
1919 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
1920 | if (ret < 0) { | |
1921 | ERR("Failed to send data back to client"); | |
1922 | } | |
1923 | ||
1924 | clean_command_ctx(cmd_ctx); | |
d6e4fca4 DG |
1925 | |
1926 | /* End of transmission */ | |
1927 | close(sock); | |
1d4b027a DG |
1928 | } |
1929 | ||
1930 | error: | |
1931 | return NULL; | |
1932 | } | |
1933 | ||
1934 | ||
fac6795d DG |
1935 | /* |
1936 | * usage function on stderr | |
1937 | */ | |
1938 | static void usage(void) | |
1939 | { | |
b716ce68 | 1940 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
1941 | fprintf(stderr, " -h, --help Display this usage.\n"); |
1942 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
1943 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
1944 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
1945 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
1946 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
1947 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
1948 | fprintf(stderr, " -V, --version Show version number.\n"); | |
1949 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
1950 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
1951 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
fac6795d DG |
1952 | } |
1953 | ||
1954 | /* | |
1955 | * daemon argument parsing | |
1956 | */ | |
1957 | static int parse_args(int argc, char **argv) | |
1958 | { | |
1959 | int c; | |
1960 | ||
1961 | static struct option long_options[] = { | |
1962 | { "client-sock", 1, 0, 'c' }, | |
1963 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
1964 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
1965 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 1966 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 1967 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
1968 | { "help", 0, 0, 'h' }, |
1969 | { "group", 1, 0, 'g' }, | |
1970 | { "version", 0, 0, 'V' }, | |
75462a81 | 1971 | { "quiet", 0, 0, 'q' }, |
3f9947db | 1972 | { "verbose", 0, 0, 'v' }, |
fac6795d DG |
1973 | { NULL, 0, 0, 0 } |
1974 | }; | |
1975 | ||
1976 | while (1) { | |
1977 | int option_index = 0; | |
d6f42150 | 1978 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index); |
fac6795d DG |
1979 | if (c == -1) { |
1980 | break; | |
1981 | } | |
1982 | ||
1983 | switch (c) { | |
1984 | case 0: | |
1985 | fprintf(stderr, "option %s", long_options[option_index].name); | |
1986 | if (optarg) { | |
1987 | fprintf(stderr, " with arg %s\n", optarg); | |
1988 | } | |
1989 | break; | |
b716ce68 | 1990 | case 'c': |
fac6795d DG |
1991 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
1992 | break; | |
1993 | case 'a': | |
1994 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
1995 | break; | |
1996 | case 'd': | |
1997 | opt_daemon = 1; | |
1998 | break; | |
1999 | case 'g': | |
2000 | opt_tracing_group = strdup(optarg); | |
2001 | break; | |
2002 | case 'h': | |
2003 | usage(); | |
2004 | exit(EXIT_FAILURE); | |
2005 | case 'V': | |
2006 | fprintf(stdout, "%s\n", VERSION); | |
2007 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2008 | case 'S': |
2009 | opt_sig_parent = 1; | |
2010 | break; | |
d6f42150 DG |
2011 | case 'E': |
2012 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2013 | break; | |
2014 | case 'C': | |
2015 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2016 | break; | |
75462a81 DG |
2017 | case 'q': |
2018 | opt_quiet = 1; | |
2019 | break; | |
3f9947db DG |
2020 | case 'v': |
2021 | opt_verbose = 1; | |
2022 | break; | |
fac6795d DG |
2023 | default: |
2024 | /* Unknown option or other error. | |
2025 | * Error is printed by getopt, just return */ | |
2026 | return -1; | |
2027 | } | |
2028 | } | |
2029 | ||
2030 | return 0; | |
2031 | } | |
2032 | ||
2033 | /* | |
2034 | * init_daemon_socket | |
2035 | * | |
2036 | * Creates the two needed socket by the daemon. | |
d6f42150 DG |
2037 | * apps_sock - The communication socket for all UST apps. |
2038 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d DG |
2039 | */ |
2040 | static int init_daemon_socket() | |
2041 | { | |
2042 | int ret = 0; | |
2043 | mode_t old_umask; | |
2044 | ||
2045 | old_umask = umask(0); | |
2046 | ||
2047 | /* Create client tool unix socket */ | |
d6f42150 DG |
2048 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2049 | if (client_sock < 0) { | |
2050 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2051 | ret = -1; |
2052 | goto end; | |
2053 | } | |
2054 | ||
2055 | /* File permission MUST be 660 */ | |
2056 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2057 | if (ret < 0) { | |
d6f42150 | 2058 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2059 | perror("chmod"); |
2060 | goto end; | |
2061 | } | |
2062 | ||
2063 | /* Create the application unix socket */ | |
d6f42150 DG |
2064 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2065 | if (apps_sock < 0) { | |
2066 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2067 | ret = -1; |
2068 | goto end; | |
2069 | } | |
2070 | ||
d6f42150 | 2071 | /* File permission MUST be 666 */ |
fac6795d DG |
2072 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2073 | if (ret < 0) { | |
d6f42150 | 2074 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2075 | perror("chmod"); |
2076 | goto end; | |
2077 | } | |
2078 | ||
2079 | end: | |
2080 | umask(old_umask); | |
2081 | return ret; | |
2082 | } | |
2083 | ||
2084 | /* | |
2085 | * check_existing_daemon | |
2086 | * | |
2087 | * Check if the global socket is available. | |
62bd06d8 | 2088 | * If yes, error is returned. |
fac6795d DG |
2089 | */ |
2090 | static int check_existing_daemon() | |
2091 | { | |
2092 | int ret; | |
2093 | ||
2094 | ret = access(client_unix_sock_path, F_OK); | |
2095 | if (ret == 0) { | |
2096 | ret = access(apps_unix_sock_path, F_OK); | |
2097 | } | |
2098 | ||
2099 | return ret; | |
2100 | } | |
2101 | ||
fac6795d | 2102 | /* |
d6f42150 | 2103 | * set_permissions |
fac6795d | 2104 | * |
5e16da05 MD |
2105 | * Set the tracing group gid onto the client socket. |
2106 | * | |
2107 | * Race window between mkdir and chown is OK because we are going from | |
a463f419 | 2108 | * more permissive (root.root) to les permissive (root.tracing). |
fac6795d | 2109 | */ |
d6f42150 | 2110 | static int set_permissions(void) |
fac6795d DG |
2111 | { |
2112 | int ret; | |
2113 | struct group *grp; | |
2114 | ||
2115 | /* Decide which group name to use */ | |
2116 | (opt_tracing_group != NULL) ? | |
2117 | (grp = getgrnam(opt_tracing_group)) : | |
2118 | (grp = getgrnam(default_tracing_group)); | |
2119 | ||
2120 | if (grp == NULL) { | |
a463f419 DG |
2121 | if (is_root) { |
2122 | WARN("No tracing group detected"); | |
2123 | ret = 0; | |
2124 | } else { | |
2125 | ERR("Missing tracing group. Aborting execution."); | |
2126 | ret = -1; | |
2127 | } | |
fac6795d DG |
2128 | goto end; |
2129 | } | |
2130 | ||
d6f42150 DG |
2131 | /* Set lttng run dir */ |
2132 | ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid); | |
2133 | if (ret < 0) { | |
2134 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2135 | perror("chown"); | |
2136 | } | |
2137 | ||
2138 | /* lttng client socket path */ | |
fac6795d DG |
2139 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); |
2140 | if (ret < 0) { | |
d6f42150 DG |
2141 | ERR("Unable to set group on %s", client_unix_sock_path); |
2142 | perror("chown"); | |
2143 | } | |
2144 | ||
2145 | /* kconsumerd error socket path */ | |
2146 | ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid); | |
2147 | if (ret < 0) { | |
2148 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2149 | perror("chown"); |
2150 | } | |
2151 | ||
d6f42150 | 2152 | DBG("All permissions are set"); |
e07ae692 | 2153 | |
fac6795d DG |
2154 | end: |
2155 | return ret; | |
2156 | } | |
2157 | ||
7a485870 DG |
2158 | /* |
2159 | * create_kernel_poll_pipe | |
2160 | * | |
2161 | * Create the pipe used to wake up the kernel thread. | |
2162 | */ | |
2163 | static int create_kernel_poll_pipe(void) | |
2164 | { | |
2165 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2166 | } | |
2167 | ||
d6f42150 DG |
2168 | /* |
2169 | * create_lttng_rundir | |
2170 | * | |
2171 | * Create the lttng run directory needed for all | |
2172 | * global sockets and pipe. | |
2173 | */ | |
2174 | static int create_lttng_rundir(void) | |
2175 | { | |
2176 | int ret; | |
2177 | ||
2178 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2179 | if (ret < 0) { | |
b1f11e69 DG |
2180 | if (errno != EEXIST) { |
2181 | ERR("Unable to create " LTTNG_RUNDIR); | |
2182 | goto error; | |
2183 | } else { | |
2184 | ret = 0; | |
2185 | } | |
d6f42150 DG |
2186 | } |
2187 | ||
2188 | error: | |
2189 | return ret; | |
2190 | } | |
2191 | ||
2192 | /* | |
2193 | * set_kconsumerd_sockets | |
2194 | * | |
2195 | * Setup sockets and directory needed by the kconsumerd | |
2196 | * communication with the session daemon. | |
2197 | */ | |
2198 | static int set_kconsumerd_sockets(void) | |
2199 | { | |
2200 | int ret; | |
2201 | ||
2202 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2203 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2204 | } | |
2205 | ||
2206 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2207 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2208 | } | |
2209 | ||
2210 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2211 | if (ret < 0) { | |
6beb2242 DG |
2212 | if (errno != EEXIST) { |
2213 | ERR("Failed to create " KCONSUMERD_PATH); | |
2214 | goto error; | |
2215 | } | |
2216 | ret = 0; | |
d6f42150 DG |
2217 | } |
2218 | ||
2219 | /* Create the kconsumerd error unix socket */ | |
2220 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
2221 | if (kconsumerd_err_sock < 0) { | |
2222 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
2223 | ret = -1; | |
2224 | goto error; | |
2225 | } | |
2226 | ||
2227 | /* File permission MUST be 660 */ | |
2228 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2229 | if (ret < 0) { | |
2230 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
2231 | perror("chmod"); | |
2232 | goto error; | |
2233 | } | |
2234 | ||
2235 | error: | |
2236 | return ret; | |
2237 | } | |
2238 | ||
fac6795d | 2239 | /* |
62bd06d8 | 2240 | * sighandler |
fac6795d | 2241 | * |
62bd06d8 | 2242 | * Signal handler for the daemon |
fac6795d DG |
2243 | */ |
2244 | static void sighandler(int sig) | |
2245 | { | |
2246 | switch (sig) { | |
2247 | case SIGPIPE: | |
e07ae692 | 2248 | DBG("SIGPIPE catched"); |
87378cf5 | 2249 | return; |
fac6795d | 2250 | case SIGINT: |
e07ae692 DG |
2251 | DBG("SIGINT catched"); |
2252 | cleanup(); | |
2253 | break; | |
fac6795d | 2254 | case SIGTERM: |
e07ae692 | 2255 | DBG("SIGTERM catched"); |
fac6795d | 2256 | cleanup(); |
686204ab | 2257 | break; |
fac6795d DG |
2258 | default: |
2259 | break; | |
2260 | } | |
2261 | ||
2262 | exit(EXIT_SUCCESS); | |
2263 | } | |
2264 | ||
2265 | /* | |
1d4b027a | 2266 | * set_signal_handler |
fac6795d | 2267 | * |
1d4b027a DG |
2268 | * Setup signal handler for : |
2269 | * SIGINT, SIGTERM, SIGPIPE | |
fac6795d | 2270 | */ |
1d4b027a | 2271 | static int set_signal_handler(void) |
fac6795d | 2272 | { |
1d4b027a DG |
2273 | int ret = 0; |
2274 | struct sigaction sa; | |
2275 | sigset_t sigset; | |
fac6795d | 2276 | |
1d4b027a DG |
2277 | if ((ret = sigemptyset(&sigset)) < 0) { |
2278 | perror("sigemptyset"); | |
2279 | return ret; | |
2280 | } | |
d6f42150 | 2281 | |
1d4b027a DG |
2282 | sa.sa_handler = sighandler; |
2283 | sa.sa_mask = sigset; | |
2284 | sa.sa_flags = 0; | |
2285 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
2286 | perror("sigaction"); | |
2287 | return ret; | |
d6f42150 DG |
2288 | } |
2289 | ||
1d4b027a DG |
2290 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
2291 | perror("sigaction"); | |
2292 | return ret; | |
d6f42150 | 2293 | } |
aaf26714 | 2294 | |
1d4b027a DG |
2295 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
2296 | perror("sigaction"); | |
2297 | return ret; | |
8c0faa1d DG |
2298 | } |
2299 | ||
1d4b027a DG |
2300 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
2301 | ||
2302 | return ret; | |
fac6795d DG |
2303 | } |
2304 | ||
f3ed775e DG |
2305 | /* |
2306 | * set_ulimit | |
2307 | * | |
2308 | * Set open files limit to unlimited. This daemon can open a large number of | |
2309 | * file descriptors in order to consumer multiple kernel traces. | |
2310 | */ | |
2311 | static void set_ulimit(void) | |
2312 | { | |
2313 | int ret; | |
2314 | struct rlimit lim; | |
2315 | ||
2316 | lim.rlim_cur = 65535; | |
2317 | lim.rlim_max = 65535; | |
2318 | ||
2319 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
2320 | if (ret < 0) { | |
2321 | perror("failed to set open files limit"); | |
2322 | } | |
2323 | } | |
2324 | ||
fac6795d DG |
2325 | /* |
2326 | * main | |
2327 | */ | |
2328 | int main(int argc, char **argv) | |
2329 | { | |
fac6795d DG |
2330 | int ret = 0; |
2331 | void *status; | |
b082db07 | 2332 | const char *home_path; |
fac6795d DG |
2333 | |
2334 | /* Parse arguments */ | |
2335 | progname = argv[0]; | |
2336 | if ((ret = parse_args(argc, argv) < 0)) { | |
2337 | goto error; | |
2338 | } | |
2339 | ||
2340 | /* Daemonize */ | |
2341 | if (opt_daemon) { | |
53094c05 DG |
2342 | ret = daemon(0, 0); |
2343 | if (ret < 0) { | |
2344 | perror("daemon"); | |
2345 | goto error; | |
2346 | } | |
fac6795d DG |
2347 | } |
2348 | ||
2349 | /* Check if daemon is UID = 0 */ | |
2350 | is_root = !getuid(); | |
2351 | ||
fac6795d | 2352 | if (is_root) { |
d6f42150 DG |
2353 | ret = create_lttng_rundir(); |
2354 | if (ret < 0) { | |
2355 | goto error; | |
2356 | } | |
2357 | ||
fac6795d | 2358 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
2359 | snprintf(apps_unix_sock_path, PATH_MAX, |
2360 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
2361 | } |
2362 | ||
2363 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
2364 | snprintf(client_unix_sock_path, PATH_MAX, |
2365 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
2366 | } | |
2367 | ||
2368 | ret = set_kconsumerd_sockets(); | |
2369 | if (ret < 0) { | |
2370 | goto error; | |
fac6795d | 2371 | } |
20fe2104 DG |
2372 | |
2373 | /* Setup kernel tracer */ | |
2374 | init_kernel_tracer(); | |
f3ed775e DG |
2375 | |
2376 | /* Set ulimit for open files */ | |
2377 | set_ulimit(); | |
fac6795d | 2378 | } else { |
b082db07 DG |
2379 | home_path = get_home_dir(); |
2380 | if (home_path == NULL) { | |
2381 | ERR("Can't get HOME directory for sockets creation.\n \ | |
2382 | Please specify --socket PATH."); | |
2383 | goto error; | |
2384 | } | |
2385 | ||
fac6795d | 2386 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 2387 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 2388 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
2389 | } |
2390 | ||
2391 | /* Set the cli tool unix socket path */ | |
2392 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 2393 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 2394 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d DG |
2395 | } |
2396 | } | |
2397 | ||
847177cd DG |
2398 | DBG("Client socket path %s", client_unix_sock_path); |
2399 | DBG("Application socket path %s", apps_unix_sock_path); | |
2400 | ||
fac6795d DG |
2401 | /* See if daemon already exist. If any of the two |
2402 | * socket needed by the daemon are present, this test fails | |
2403 | */ | |
2404 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 2405 | ERR("Already running daemon.\n"); |
ab118b20 | 2406 | /* We do not goto error because we must not |
d6f42150 | 2407 | * cleanup() because a daemon is already running. |
ab118b20 | 2408 | */ |
5e16da05 | 2409 | exit(EXIT_FAILURE); |
fac6795d DG |
2410 | } |
2411 | ||
2412 | if (set_signal_handler() < 0) { | |
2413 | goto error; | |
2414 | } | |
2415 | ||
d6f42150 | 2416 | /* Setup the needed unix socket */ |
fac6795d DG |
2417 | if (init_daemon_socket() < 0) { |
2418 | goto error; | |
2419 | } | |
2420 | ||
2421 | /* Set credentials to socket */ | |
d6f42150 | 2422 | if (is_root && (set_permissions() < 0)) { |
fac6795d DG |
2423 | goto error; |
2424 | } | |
2425 | ||
5b8719f5 DG |
2426 | /* Get parent pid if -S, --sig-parent is specified. */ |
2427 | if (opt_sig_parent) { | |
2428 | ppid = getppid(); | |
2429 | } | |
2430 | ||
7a485870 DG |
2431 | /* Setup the kernel pipe for waking up the kernel thread */ |
2432 | if (create_kernel_poll_pipe() < 0) { | |
2433 | goto error; | |
2434 | } | |
2435 | ||
fac6795d DG |
2436 | while (1) { |
2437 | /* Create thread to manage the client socket */ | |
1d4b027a | 2438 | ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL); |
fac6795d DG |
2439 | if (ret != 0) { |
2440 | perror("pthread_create"); | |
2441 | goto error; | |
2442 | } | |
2443 | ||
2444 | /* Create thread to manage application socket */ | |
1d4b027a | 2445 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); |
fac6795d DG |
2446 | if (ret != 0) { |
2447 | perror("pthread_create"); | |
2448 | goto error; | |
2449 | } | |
2450 | ||
7a485870 DG |
2451 | /* Create kernel thread to manage kernel event */ |
2452 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
2453 | if (ret != 0) { | |
2454 | perror("pthread_create"); | |
2455 | goto error; | |
2456 | } | |
2457 | ||
1d4b027a DG |
2458 | ret = pthread_join(client_thread, &status); |
2459 | if (ret != 0) { | |
2460 | perror("pthread_join"); | |
2461 | goto error; | |
fac6795d DG |
2462 | } |
2463 | } | |
2464 | ||
2465 | cleanup(); | |
5e16da05 | 2466 | exit(EXIT_SUCCESS); |
fac6795d DG |
2467 | |
2468 | error: | |
2469 | cleanup(); | |
5e16da05 | 2470 | exit(EXIT_FAILURE); |
fac6795d | 2471 | } |