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 | 43 | |
b579acd9 | 44 | #include "context.h" |
fac6795d DG |
45 | #include "liblttsessiondcomm.h" |
46 | #include "ltt-sessiond.h" | |
75462a81 | 47 | #include "lttngerr.h" |
20fe2104 | 48 | #include "kernel-ctl.h" |
9e78d6ae | 49 | #include "ust-ctl.h" |
5b74c7b1 | 50 | #include "session.h" |
91d76f53 | 51 | #include "traceable-app.h" |
5dc18550 | 52 | #include "lttng-kconsumerd.h" |
8e68d1c8 | 53 | #include "utils.h" |
fac6795d | 54 | |
75462a81 | 55 | /* Const values */ |
686204ab | 56 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 57 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
58 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
59 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
60 | ||
fac6795d | 61 | /* Variables */ |
1d4b027a DG |
62 | int opt_verbose; /* Not static for lttngerr.h */ |
63 | int opt_quiet; /* Not static for lttngerr.h */ | |
d063d709 | 64 | |
fac6795d DG |
65 | const char *progname; |
66 | const char *opt_tracing_group; | |
5b8719f5 | 67 | static int opt_sig_parent; |
fac6795d DG |
68 | static int opt_daemon; |
69 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
70 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
71 | static pid_t kconsumerd_pid; | |
7a485870 | 72 | static struct pollfd *kernel_pollfd; |
fac6795d | 73 | |
d6f42150 DG |
74 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
75 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
76 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
77 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
fac6795d | 78 | |
1d4b027a | 79 | /* Sockets and FDs */ |
d6f42150 DG |
80 | static int client_sock; |
81 | static int apps_sock; | |
82 | static int kconsumerd_err_sock; | |
8c0faa1d | 83 | static int kconsumerd_cmd_sock; |
20fe2104 | 84 | static int kernel_tracer_fd; |
7a485870 | 85 | static int kernel_poll_pipe[2]; |
1d4b027a | 86 | |
273ea72c DG |
87 | /* |
88 | * Quit pipe for all threads. This permits a single cancellation point | |
89 | * for all threads when receiving an event on the pipe. | |
90 | */ | |
91 | static int thread_quit_pipe[2]; | |
92 | ||
1d4b027a | 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 | |
ab147185 MD |
102 | static int modprobe_remove_kernel_modules(void); |
103 | ||
b5541356 DG |
104 | /* |
105 | * Pointer initialized before thread creation. | |
106 | * | |
107 | * This points to the tracing session list containing the session count and a | |
108 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
109 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 110 | * |
d063d709 DG |
111 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
112 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
113 | */ |
114 | static struct ltt_session_list *session_list_ptr; | |
115 | ||
273ea72c DG |
116 | /* |
117 | * Init quit pipe. | |
118 | * | |
119 | * Return -1 on error or 0 if all pipes are created. | |
120 | */ | |
121 | static int init_thread_quit_pipe(void) | |
122 | { | |
123 | int ret; | |
124 | ||
125 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
126 | if (ret < 0) { | |
127 | perror("thread quit pipe"); | |
128 | goto error; | |
129 | } | |
130 | ||
131 | error: | |
132 | return ret; | |
133 | } | |
134 | ||
fac6795d | 135 | /* |
d063d709 DG |
136 | * Complete teardown of a kernel session. This free all data structure related |
137 | * to a kernel session and update counter. | |
fac6795d | 138 | */ |
1d4b027a | 139 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 140 | { |
1d4b027a DG |
141 | if (session->kernel_session != NULL) { |
142 | DBG("Tearing down kernel session"); | |
c363b55d | 143 | trace_destroy_kernel_session(session->kernel_session); |
1d4b027a DG |
144 | /* Extra precaution */ |
145 | session->kernel_session = NULL; | |
fac6795d | 146 | } |
fac6795d DG |
147 | } |
148 | ||
149 | /* | |
d063d709 | 150 | * Cleanup the daemon |
fac6795d | 151 | */ |
1d4b027a | 152 | static void cleanup() |
fac6795d | 153 | { |
1d4b027a DG |
154 | int ret; |
155 | char *cmd; | |
af9737e9 | 156 | struct ltt_session *sess, *stmp; |
fac6795d | 157 | |
1d4b027a | 158 | DBG("Cleaning up"); |
e07ae692 | 159 | |
1d4b027a | 160 | /* <fun> */ |
273ea72c DG |
161 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
162 | "Matthew, BEET driven development works!%c[%dm", | |
163 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 164 | /* </fun> */ |
fac6795d | 165 | |
1d4b027a DG |
166 | /* Stopping all threads */ |
167 | DBG("Terminating all threads"); | |
273ea72c DG |
168 | close(thread_quit_pipe[0]); |
169 | close(thread_quit_pipe[1]); | |
fac6795d | 170 | |
1d4b027a DG |
171 | DBG("Removing %s directory", LTTNG_RUNDIR); |
172 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
173 | if (ret < 0) { | |
174 | ERR("asprintf failed. Something is really wrong!"); | |
175 | } | |
5461b305 | 176 | |
1d4b027a DG |
177 | /* Remove lttng run directory */ |
178 | ret = system(cmd); | |
179 | if (ret < 0) { | |
180 | ERR("Unable to clean " LTTNG_RUNDIR); | |
181 | } | |
5461b305 | 182 | |
1d4b027a | 183 | DBG("Cleaning up all session"); |
fac6795d | 184 | |
b5541356 | 185 | /* Destroy session list mutex */ |
273ea72c DG |
186 | if (session_list_ptr != NULL) { |
187 | pthread_mutex_destroy(&session_list_ptr->lock); | |
188 | ||
189 | /* Cleanup ALL session */ | |
af9737e9 | 190 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
273ea72c DG |
191 | teardown_kernel_session(sess); |
192 | // TODO complete session cleanup (including UST) | |
193 | } | |
194 | } | |
195 | ||
196 | pthread_mutex_destroy(&kconsumerd_pid_mutex); | |
b5541356 | 197 | |
f3ed775e | 198 | DBG("Closing kernel fd"); |
1d4b027a | 199 | close(kernel_tracer_fd); |
ab147185 MD |
200 | |
201 | DBG("Unloading kernel modules"); | |
202 | modprobe_remove_kernel_modules(); | |
fac6795d DG |
203 | } |
204 | ||
e065084a | 205 | /* |
d063d709 | 206 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 207 | * |
d063d709 | 208 | * Return lttcomm error code. |
e065084a DG |
209 | */ |
210 | static int send_unix_sock(int sock, void *buf, size_t len) | |
211 | { | |
212 | /* Check valid length */ | |
213 | if (len <= 0) { | |
214 | return -1; | |
215 | } | |
216 | ||
217 | return lttcomm_send_unix_sock(sock, buf, len); | |
218 | } | |
219 | ||
5461b305 | 220 | /* |
d063d709 | 221 | * Free memory of a command context structure. |
5461b305 | 222 | */ |
a2fb29a5 | 223 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 224 | { |
a2fb29a5 DG |
225 | DBG("Clean command context structure"); |
226 | if (*cmd_ctx) { | |
227 | if ((*cmd_ctx)->llm) { | |
228 | free((*cmd_ctx)->llm); | |
5461b305 | 229 | } |
a2fb29a5 DG |
230 | if ((*cmd_ctx)->lsm) { |
231 | free((*cmd_ctx)->lsm); | |
5461b305 | 232 | } |
a2fb29a5 DG |
233 | free(*cmd_ctx); |
234 | *cmd_ctx = NULL; | |
5461b305 DG |
235 | } |
236 | } | |
237 | ||
f3ed775e | 238 | /* |
d063d709 | 239 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 240 | */ |
7a485870 | 241 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
242 | { |
243 | int ret; | |
244 | size_t nb_fd; | |
245 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
246 | struct lttcomm_kconsumerd_header lkh; |
247 | struct lttcomm_kconsumerd_msg lkm; | |
248 | ||
7a485870 DG |
249 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
250 | ||
251 | nb_fd = channel->stream_count; | |
f3ed775e DG |
252 | |
253 | /* Setup header */ | |
7a485870 | 254 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
255 | lkh.cmd_type = ADD_STREAM; |
256 | ||
257 | DBG("Sending kconsumerd header"); | |
258 | ||
259 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
260 | if (ret < 0) { | |
261 | perror("send kconsumerd header"); | |
262 | goto error; | |
263 | } | |
264 | ||
7a485870 DG |
265 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
266 | if (stream->fd != 0) { | |
f3ed775e DG |
267 | lkm.fd = stream->fd; |
268 | lkm.state = stream->state; | |
7a485870 | 269 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
f3ed775e DG |
270 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
271 | ||
272 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
273 | ||
274 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
275 | if (ret < 0) { | |
276 | perror("send kconsumerd fd"); | |
277 | goto error; | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
7a485870 | 282 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
283 | |
284 | return 0; | |
285 | ||
286 | error: | |
287 | return ret; | |
288 | } | |
289 | ||
290 | /* | |
d063d709 | 291 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 292 | */ |
7a485870 | 293 | static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session) |
f3ed775e DG |
294 | { |
295 | int ret; | |
296 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
297 | struct lttcomm_kconsumerd_header lkh; |
298 | struct lttcomm_kconsumerd_msg lkm; | |
299 | ||
300 | /* Setup header */ | |
301 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
302 | lkh.cmd_type = ADD_STREAM; | |
303 | ||
304 | DBG("Sending kconsumerd header for metadata"); | |
305 | ||
306 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
307 | if (ret < 0) { | |
308 | perror("send kconsumerd header"); | |
309 | goto error; | |
310 | } | |
311 | ||
312 | DBG("Sending metadata stream fd"); | |
313 | ||
314 | if (session->metadata_stream_fd != 0) { | |
315 | /* Send metadata stream fd first */ | |
316 | lkm.fd = session->metadata_stream_fd; | |
317 | lkm.state = ACTIVE_FD; | |
318 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
319 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); | |
320 | ||
321 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
322 | if (ret < 0) { | |
323 | perror("send kconsumerd fd"); | |
324 | goto error; | |
325 | } | |
326 | } | |
f3ed775e | 327 | |
f3ed775e | 328 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
7a485870 | 329 | ret = send_kconsumerd_channel_fds(sock, chan); |
f3ed775e | 330 | if (ret < 0) { |
7a485870 | 331 | goto error; |
f3ed775e DG |
332 | } |
333 | } | |
334 | ||
7a485870 DG |
335 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
336 | ||
f3ed775e DG |
337 | return 0; |
338 | ||
339 | error: | |
340 | return ret; | |
341 | } | |
342 | ||
97b1a726 | 343 | #ifdef DISABLED |
fac6795d | 344 | /* |
d063d709 DG |
345 | * Return a socket connected to the libust communication socket of the |
346 | * application identified by the pid. | |
fac6795d | 347 | * |
d063d709 | 348 | * If the pid is not found in the traceable list, return -1 to indicate error. |
fac6795d | 349 | */ |
471d1693 | 350 | static int ust_connect_app(pid_t pid) |
fac6795d | 351 | { |
91d76f53 DG |
352 | int sock; |
353 | struct ltt_traceable_app *lta; | |
379473d2 | 354 | |
e07ae692 DG |
355 | DBG("Connect to application pid %d", pid); |
356 | ||
91d76f53 DG |
357 | lta = find_app_by_pid(pid); |
358 | if (lta == NULL) { | |
359 | /* App not found */ | |
7442b2ba | 360 | DBG("Application pid %d not found", pid); |
379473d2 DG |
361 | return -1; |
362 | } | |
fac6795d | 363 | |
91d76f53 | 364 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 365 | if (sock < 0) { |
62d3069f | 366 | ERR("Fail connecting to the PID %d", pid); |
fac6795d DG |
367 | } |
368 | ||
369 | return sock; | |
370 | } | |
97b1a726 | 371 | #endif /* DISABLED */ |
fac6795d DG |
372 | |
373 | /* | |
d063d709 DG |
374 | * Notify apps by writing 42 to a named pipe using name. Every applications |
375 | * waiting for a ltt-sessiond will be notified and re-register automatically to | |
376 | * the session daemon. | |
fac6795d | 377 | * |
d063d709 | 378 | * Return open or write error value. |
fac6795d DG |
379 | */ |
380 | static int notify_apps(const char *name) | |
381 | { | |
382 | int fd; | |
383 | int ret = -1; | |
384 | ||
e07ae692 DG |
385 | DBG("Notify the global application pipe"); |
386 | ||
fac6795d DG |
387 | /* Try opening the global pipe */ |
388 | fd = open(name, O_WRONLY); | |
389 | if (fd < 0) { | |
390 | goto error; | |
391 | } | |
392 | ||
393 | /* Notify by writing on the pipe */ | |
394 | ret = write(fd, "42", 2); | |
395 | if (ret < 0) { | |
396 | perror("write"); | |
397 | } | |
398 | ||
399 | error: | |
400 | return ret; | |
401 | } | |
402 | ||
e065084a | 403 | /* |
d063d709 DG |
404 | * Setup the outgoing data buffer for the response (llm) by allocating the |
405 | * right amount of memory and copying the original information from the lsm | |
406 | * structure. | |
ca95a216 | 407 | * |
d063d709 | 408 | * Return total size of the buffer pointed by buf. |
ca95a216 | 409 | */ |
5461b305 | 410 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 411 | { |
f3ed775e | 412 | int ret, buf_size; |
ca95a216 | 413 | |
f3ed775e | 414 | buf_size = size; |
5461b305 DG |
415 | |
416 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
417 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 418 | perror("malloc"); |
5461b305 | 419 | ret = -ENOMEM; |
ca95a216 DG |
420 | goto error; |
421 | } | |
422 | ||
5461b305 DG |
423 | /* Copy common data */ |
424 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 425 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 426 | |
5461b305 DG |
427 | cmd_ctx->llm->data_size = size; |
428 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
429 | ||
ca95a216 DG |
430 | return buf_size; |
431 | ||
432 | error: | |
433 | return ret; | |
434 | } | |
435 | ||
7a485870 | 436 | /* |
d063d709 DG |
437 | * Update the kernel pollfd set of all channel fd available over all tracing |
438 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
439 | */ |
440 | static int update_kernel_pollfd(void) | |
441 | { | |
442 | int i = 0; | |
273ea72c DG |
443 | /* |
444 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
445 | * at 2 for those pipes. | |
446 | */ | |
447 | unsigned int nb_fd = 2; | |
7a485870 DG |
448 | struct ltt_session *session; |
449 | struct ltt_kernel_channel *channel; | |
450 | ||
451 | DBG("Updating kernel_pollfd"); | |
452 | ||
453 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 454 | lock_session_list(); |
b5541356 DG |
455 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
456 | lock_session(session); | |
7a485870 | 457 | if (session->kernel_session == NULL) { |
b5541356 | 458 | unlock_session(session); |
7a485870 DG |
459 | continue; |
460 | } | |
461 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 462 | unlock_session(session); |
7a485870 DG |
463 | } |
464 | ||
465 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
466 | ||
467 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
468 | if (kernel_pollfd == NULL) { | |
469 | perror("malloc kernel_pollfd"); | |
470 | goto error; | |
471 | } | |
472 | ||
b5541356 DG |
473 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
474 | lock_session(session); | |
7a485870 | 475 | if (session->kernel_session == NULL) { |
b5541356 | 476 | unlock_session(session); |
7a485870 DG |
477 | continue; |
478 | } | |
479 | if (i >= nb_fd) { | |
480 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 481 | unlock_session(session); |
7a485870 DG |
482 | break; |
483 | } | |
484 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
485 | kernel_pollfd[i].fd = channel->fd; | |
486 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
487 | i++; | |
488 | } | |
b5541356 | 489 | unlock_session(session); |
7a485870 | 490 | } |
6c9cc2ab | 491 | unlock_session_list(); |
7a485870 DG |
492 | |
493 | /* Adding wake up pipe */ | |
273ea72c DG |
494 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
495 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
496 | ||
497 | /* Adding the quit pipe */ | |
498 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
499 | |
500 | return nb_fd; | |
501 | ||
502 | error: | |
6c9cc2ab | 503 | unlock_session_list(); |
7a485870 DG |
504 | return -1; |
505 | } | |
506 | ||
507 | /* | |
d063d709 DG |
508 | * Find the channel fd from 'fd' over all tracing session. When found, check |
509 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 510 | * |
d063d709 | 511 | * Useful for CPU hotplug feature. |
7a485870 DG |
512 | */ |
513 | static int update_kernel_stream(int fd) | |
514 | { | |
515 | int ret = 0; | |
516 | struct ltt_session *session; | |
517 | struct ltt_kernel_channel *channel; | |
518 | ||
519 | DBG("Updating kernel streams for channel fd %d", fd); | |
520 | ||
6c9cc2ab | 521 | lock_session_list(); |
b5541356 DG |
522 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
523 | lock_session(session); | |
7a485870 | 524 | if (session->kernel_session == NULL) { |
b5541356 | 525 | unlock_session(session); |
7a485870 DG |
526 | continue; |
527 | } | |
528 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
529 | if (channel->fd == fd) { | |
530 | DBG("Channel found, updating kernel streams"); | |
531 | ret = kernel_open_channel_stream(channel); | |
532 | if (ret < 0) { | |
533 | goto end; | |
534 | } | |
535 | /* | |
536 | * Have we already sent fds to the consumer? If yes, it means that | |
537 | * tracing is started so it is safe to send our updated stream fds. | |
538 | */ | |
539 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
540 | ret = send_kconsumerd_channel_fds(kconsumerd_cmd_sock, channel); | |
541 | if (ret < 0) { | |
542 | goto end; | |
543 | } | |
544 | } | |
545 | goto end; | |
546 | } | |
547 | } | |
b5541356 | 548 | unlock_session(session); |
7a485870 DG |
549 | } |
550 | ||
551 | end: | |
6c9cc2ab | 552 | unlock_session_list(); |
b5541356 DG |
553 | if (session) { |
554 | unlock_session(session); | |
555 | } | |
7a485870 DG |
556 | return ret; |
557 | } | |
558 | ||
559 | /* | |
d063d709 | 560 | * This thread manage event coming from the kernel. |
7a485870 | 561 | * |
d063d709 DG |
562 | * Features supported in this thread: |
563 | * -) CPU Hotplug | |
7a485870 DG |
564 | */ |
565 | static void *thread_manage_kernel(void *data) | |
566 | { | |
567 | int ret, i, nb_fd = 0; | |
568 | char tmp; | |
569 | int update_poll_flag = 1; | |
570 | ||
571 | DBG("Thread manage kernel started"); | |
572 | ||
573 | while (1) { | |
574 | if (update_poll_flag == 1) { | |
575 | nb_fd = update_kernel_pollfd(); | |
576 | if (nb_fd < 0) { | |
577 | goto error; | |
578 | } | |
579 | update_poll_flag = 0; | |
580 | } | |
581 | ||
582 | DBG("Polling on %d fds", nb_fd); | |
583 | ||
584 | /* Poll infinite value of time */ | |
585 | ret = poll(kernel_pollfd, nb_fd, -1); | |
586 | if (ret < 0) { | |
587 | perror("poll kernel thread"); | |
588 | goto error; | |
589 | } else if (ret == 0) { | |
590 | /* Should not happen since timeout is infinite */ | |
591 | continue; | |
592 | } | |
593 | ||
273ea72c DG |
594 | /* Thread quit pipe has been closed. Killing thread. */ |
595 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
596 | goto error; | |
597 | } | |
598 | ||
7a485870 DG |
599 | DBG("Kernel poll event triggered"); |
600 | ||
601 | /* | |
602 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
603 | * must be updated. | |
604 | */ | |
273ea72c | 605 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 606 | case POLLIN: |
7a485870 DG |
607 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
608 | update_poll_flag = 1; | |
609 | continue; | |
b5541356 DG |
610 | case POLLERR: |
611 | goto error; | |
612 | default: | |
613 | break; | |
7a485870 DG |
614 | } |
615 | ||
616 | for (i = 0; i < nb_fd; i++) { | |
617 | switch (kernel_pollfd[i].revents) { | |
618 | /* | |
619 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
620 | * session and updating the kernel consumer | |
621 | */ | |
622 | case POLLIN | POLLRDNORM: | |
623 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
624 | if (ret < 0) { | |
625 | continue; | |
626 | } | |
627 | break; | |
628 | } | |
629 | } | |
630 | } | |
631 | ||
632 | error: | |
633 | DBG("Kernel thread dying"); | |
634 | if (kernel_pollfd) { | |
635 | free(kernel_pollfd); | |
636 | } | |
273ea72c DG |
637 | |
638 | close(kernel_poll_pipe[0]); | |
639 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
640 | return NULL; |
641 | } | |
642 | ||
1d4b027a | 643 | /* |
d063d709 | 644 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
645 | */ |
646 | static void *thread_manage_kconsumerd(void *data) | |
647 | { | |
273ea72c | 648 | int sock = 0, ret; |
1d4b027a | 649 | enum lttcomm_return_code code; |
273ea72c | 650 | struct pollfd pollfd[2]; |
1d4b027a DG |
651 | |
652 | DBG("[thread] Manage kconsumerd started"); | |
653 | ||
654 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
655 | if (ret < 0) { | |
656 | goto error; | |
657 | } | |
658 | ||
273ea72c DG |
659 | /* First fd is always the quit pipe */ |
660 | pollfd[0].fd = thread_quit_pipe[0]; | |
661 | ||
662 | /* Apps socket */ | |
663 | pollfd[1].fd = kconsumerd_err_sock; | |
664 | pollfd[1].events = POLLIN; | |
665 | ||
666 | /* Inifinite blocking call, waiting for transmission */ | |
667 | ret = poll(pollfd, 2, -1); | |
668 | if (ret < 0) { | |
669 | perror("poll kconsumerd thread"); | |
670 | goto error; | |
671 | } | |
672 | ||
673 | /* Thread quit pipe has been closed. Killing thread. */ | |
674 | if (pollfd[0].revents == POLLNVAL) { | |
675 | goto error; | |
676 | } else if (pollfd[1].revents == POLLERR) { | |
677 | ERR("Kconsumerd err socket poll error"); | |
678 | goto error; | |
679 | } | |
680 | ||
1d4b027a DG |
681 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
682 | if (sock < 0) { | |
683 | goto error; | |
684 | } | |
685 | ||
712ea556 | 686 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
687 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
688 | if (ret <= 0) { | |
689 | goto error; | |
690 | } | |
691 | ||
692 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
693 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
694 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 695 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
696 | perror("kconsumerd connect"); |
697 | goto error; | |
698 | } | |
699 | /* Signal condition to tell that the kconsumerd is ready */ | |
700 | sem_post(&kconsumerd_sem); | |
701 | DBG("Kconsumerd command socket ready"); | |
702 | } else { | |
6f61d021 | 703 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
704 | lttcomm_get_readable_code(-code)); |
705 | goto error; | |
706 | } | |
707 | ||
712ea556 DG |
708 | /* Wait for any kconsumerd error */ |
709 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
710 | if (ret <= 0) { | |
711 | ERR("Kconsumerd closed the command socket"); | |
712 | goto error; | |
6f61d021 | 713 | } |
1d4b027a | 714 | |
712ea556 DG |
715 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
716 | ||
1d4b027a | 717 | error: |
6f61d021 | 718 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
719 | if (kconsumerd_err_sock) { |
720 | close(kconsumerd_err_sock); | |
721 | } | |
722 | if (kconsumerd_cmd_sock) { | |
723 | close(kconsumerd_cmd_sock); | |
724 | } | |
725 | if (sock) { | |
726 | close(sock); | |
727 | } | |
728 | ||
729 | unlink(kconsumerd_err_unix_sock_path); | |
730 | unlink(kconsumerd_cmd_unix_sock_path); | |
731 | ||
732 | kconsumerd_pid = 0; | |
1d4b027a DG |
733 | return NULL; |
734 | } | |
735 | ||
736 | /* | |
1d4b027a DG |
737 | * This thread manage the application socket communication |
738 | */ | |
739 | static void *thread_manage_apps(void *data) | |
740 | { | |
273ea72c DG |
741 | int sock = 0, ret; |
742 | struct pollfd pollfd[2]; | |
1d4b027a DG |
743 | |
744 | /* TODO: Something more elegant is needed but fine for now */ | |
745 | /* FIXME: change all types to either uint8_t, uint32_t, uint64_t | |
746 | * for 32-bit vs 64-bit compat processes. */ | |
747 | /* replicate in ust with version number */ | |
748 | struct { | |
749 | int reg; /* 1:register, 0:unregister */ | |
750 | pid_t pid; | |
751 | uid_t uid; | |
752 | } reg_msg; | |
753 | ||
754 | DBG("[thread] Manage apps started"); | |
755 | ||
756 | ret = lttcomm_listen_unix_sock(apps_sock); | |
757 | if (ret < 0) { | |
758 | goto error; | |
759 | } | |
760 | ||
273ea72c DG |
761 | /* First fd is always the quit pipe */ |
762 | pollfd[0].fd = thread_quit_pipe[0]; | |
763 | ||
764 | /* Apps socket */ | |
765 | pollfd[1].fd = apps_sock; | |
766 | pollfd[1].events = POLLIN; | |
767 | ||
1d4b027a DG |
768 | /* Notify all applications to register */ |
769 | notify_apps(default_global_apps_pipe); | |
770 | ||
771 | while (1) { | |
772 | DBG("Accepting application registration"); | |
273ea72c DG |
773 | |
774 | /* Inifinite blocking call, waiting for transmission */ | |
775 | ret = poll(pollfd, 2, -1); | |
776 | if (ret < 0) { | |
777 | perror("poll apps thread"); | |
778 | goto error; | |
779 | } | |
780 | ||
781 | /* Thread quit pipe has been closed. Killing thread. */ | |
782 | if (pollfd[0].revents == POLLNVAL) { | |
783 | goto error; | |
784 | } else if (pollfd[1].revents == POLLERR) { | |
785 | ERR("Apps socket poll error"); | |
786 | goto error; | |
787 | } | |
788 | ||
1d4b027a DG |
789 | sock = lttcomm_accept_unix_sock(apps_sock); |
790 | if (sock < 0) { | |
791 | goto error; | |
792 | } | |
793 | ||
273ea72c DG |
794 | /* |
795 | * Basic recv here to handle the very simple data | |
1d4b027a DG |
796 | * that the libust send to register (reg_msg). |
797 | */ | |
798 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
799 | if (ret < 0) { | |
800 | perror("recv"); | |
801 | continue; | |
802 | } | |
803 | ||
804 | /* Add application to the global traceable list */ | |
805 | if (reg_msg.reg == 1) { | |
806 | /* Registering */ | |
807 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); | |
808 | if (ret < 0) { | |
809 | /* register_traceable_app only return an error with | |
810 | * ENOMEM. At this point, we better stop everything. | |
811 | */ | |
812 | goto error; | |
813 | } | |
814 | } else { | |
815 | /* Unregistering */ | |
816 | unregister_traceable_app(reg_msg.pid); | |
817 | } | |
818 | } | |
819 | ||
820 | error: | |
273ea72c DG |
821 | DBG("Apps thread dying"); |
822 | if (apps_sock) { | |
823 | close(apps_sock); | |
824 | } | |
825 | if (sock) { | |
826 | close(sock); | |
827 | } | |
1d4b027a | 828 | |
273ea72c | 829 | unlink(apps_unix_sock_path); |
1d4b027a DG |
830 | return NULL; |
831 | } | |
832 | ||
8c0faa1d | 833 | /* |
d063d709 DG |
834 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
835 | * exec or it will fails. | |
8c0faa1d | 836 | */ |
693bd40b | 837 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
838 | { |
839 | int ret; | |
840 | ||
841 | /* Setup semaphore */ | |
842 | sem_init(&kconsumerd_sem, 0, 0); | |
843 | ||
1d4b027a | 844 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
845 | if (ret != 0) { |
846 | perror("pthread_create kconsumerd"); | |
847 | goto error; | |
848 | } | |
849 | ||
693bd40b | 850 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
851 | sem_wait(&kconsumerd_sem); |
852 | ||
712ea556 DG |
853 | if (kconsumerd_pid == 0) { |
854 | ERR("Kconsumerd did not start"); | |
855 | goto error; | |
856 | } | |
857 | ||
8c0faa1d DG |
858 | return 0; |
859 | ||
860 | error: | |
712ea556 | 861 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
862 | return ret; |
863 | } | |
864 | ||
865 | /* | |
d063d709 | 866 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 867 | * |
d063d709 | 868 | * Return pid if successful else -1. |
8c0faa1d | 869 | */ |
693bd40b | 870 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
871 | { |
872 | int ret; | |
873 | pid_t pid; | |
53086306 | 874 | const char *verbosity; |
8c0faa1d | 875 | |
c49dc785 DG |
876 | DBG("Spawning kconsumerd"); |
877 | ||
8c0faa1d DG |
878 | pid = fork(); |
879 | if (pid == 0) { | |
880 | /* | |
881 | * Exec kconsumerd. | |
882 | */ | |
53086306 DG |
883 | if (opt_verbose > 1) { |
884 | verbosity = "--verbose"; | |
885 | } else { | |
886 | verbosity = "--quiet"; | |
887 | } | |
888 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
889 | if (errno != 0) { |
890 | perror("kernel start consumer exec"); | |
891 | } | |
892 | exit(EXIT_FAILURE); | |
893 | } else if (pid > 0) { | |
894 | ret = pid; | |
895 | goto error; | |
896 | } else { | |
897 | perror("kernel start consumer fork"); | |
898 | ret = -errno; | |
899 | goto error; | |
900 | } | |
901 | ||
902 | error: | |
903 | return ret; | |
904 | } | |
905 | ||
693bd40b | 906 | /* |
d063d709 | 907 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
908 | */ |
909 | static int start_kconsumerd(void) | |
910 | { | |
911 | int ret; | |
912 | ||
693bd40b | 913 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 914 | if (kconsumerd_pid != 0) { |
817153bb | 915 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
916 | goto end; |
917 | } | |
693bd40b | 918 | |
c49dc785 DG |
919 | ret = spawn_kconsumerd(); |
920 | if (ret < 0) { | |
921 | ERR("Spawning kconsumerd failed"); | |
922 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
923 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
924 | goto error; | |
693bd40b | 925 | } |
c49dc785 DG |
926 | |
927 | /* Setting up the global kconsumerd_pid */ | |
928 | kconsumerd_pid = ret; | |
693bd40b DG |
929 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
930 | ||
6f61d021 DG |
931 | DBG("Kconsumerd pid %d", ret); |
932 | ||
693bd40b | 933 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
934 | ret = spawn_kconsumerd_thread(); |
935 | if (ret < 0) { | |
936 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
937 | goto error; |
938 | } | |
939 | ||
c49dc785 | 940 | end: |
693bd40b DG |
941 | return 0; |
942 | ||
943 | error: | |
944 | return ret; | |
945 | } | |
946 | ||
b73401da | 947 | /* |
d063d709 | 948 | * modprobe_kernel_modules |
b73401da DG |
949 | */ |
950 | static int modprobe_kernel_modules(void) | |
951 | { | |
ab147185 | 952 | int ret = 0, i; |
b73401da DG |
953 | char modprobe[256]; |
954 | ||
ab147185 MD |
955 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
956 | ret = snprintf(modprobe, sizeof(modprobe), | |
957 | "/sbin/modprobe %s%s", | |
958 | kernel_modules_list[i].required ? "" : "--quiet ", | |
959 | kernel_modules_list[i].name); | |
b73401da DG |
960 | if (ret < 0) { |
961 | perror("snprintf modprobe"); | |
962 | goto error; | |
963 | } | |
ab147185 | 964 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 965 | ret = system(modprobe); |
ab147185 MD |
966 | if (ret == -1) { |
967 | ERR("Unable to launch modprobe for module %s", | |
968 | kernel_modules_list[i].name); | |
969 | } else if (kernel_modules_list[i].required | |
970 | && WEXITSTATUS(ret) != 0) { | |
971 | ERR("Unable to load module %s", | |
972 | kernel_modules_list[i].name); | |
973 | } else { | |
974 | DBG("Modprobe successfully %s", | |
975 | kernel_modules_list[i].name); | |
976 | } | |
977 | } | |
978 | ||
979 | error: | |
980 | return ret; | |
981 | } | |
982 | ||
983 | /* | |
984 | * modprobe_remove_kernel_modules | |
985 | * Remove modules in reverse load order. | |
986 | */ | |
987 | static int modprobe_remove_kernel_modules(void) | |
988 | { | |
989 | int ret = 0, i; | |
990 | char modprobe[256]; | |
991 | ||
992 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
993 | ret = snprintf(modprobe, sizeof(modprobe), | |
994 | "/sbin/modprobe --remove --quiet %s", | |
995 | kernel_modules_list[i].name); | |
b73401da | 996 | if (ret < 0) { |
ab147185 MD |
997 | perror("snprintf modprobe --remove"); |
998 | goto error; | |
999 | } | |
1000 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
1001 | ret = system(modprobe); | |
1002 | if (ret == -1) { | |
1003 | ERR("Unable to launch modprobe --remove for module %s", | |
1004 | kernel_modules_list[i].name); | |
1005 | } else if (kernel_modules_list[i].required | |
1006 | && WEXITSTATUS(ret) != 0) { | |
1007 | ERR("Unable to remove module %s", | |
1008 | kernel_modules_list[i].name); | |
1009 | } else { | |
1010 | DBG("Modprobe removal successful %s", | |
1011 | kernel_modules_list[i].name); | |
b73401da | 1012 | } |
b73401da DG |
1013 | } |
1014 | ||
1015 | error: | |
1016 | return ret; | |
1017 | } | |
1018 | ||
1019 | /* | |
d063d709 | 1020 | * mount_debugfs |
b73401da DG |
1021 | */ |
1022 | static int mount_debugfs(char *path) | |
1023 | { | |
1024 | int ret; | |
1025 | char *type = "debugfs"; | |
1026 | ||
1027 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG); | |
1028 | if (ret < 0) { | |
1029 | goto error; | |
1030 | } | |
1031 | ||
1032 | ret = mount(type, path, type, 0, NULL); | |
1033 | if (ret < 0) { | |
1034 | perror("mount debugfs"); | |
1035 | goto error; | |
1036 | } | |
1037 | ||
1038 | DBG("Mounted debugfs successfully at %s", path); | |
1039 | ||
1040 | error: | |
1041 | return ret; | |
1042 | } | |
1043 | ||
8c0faa1d | 1044 | /* |
d063d709 | 1045 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1046 | */ |
f3ed775e | 1047 | static void init_kernel_tracer(void) |
8c0faa1d | 1048 | { |
b73401da DG |
1049 | int ret; |
1050 | char *proc_mounts = "/proc/mounts"; | |
1051 | char line[256]; | |
1052 | char *debugfs_path = NULL, *lttng_path; | |
1053 | FILE *fp; | |
1054 | ||
1055 | /* Detect debugfs */ | |
1056 | fp = fopen(proc_mounts, "r"); | |
1057 | if (fp == NULL) { | |
1058 | ERR("Unable to probe %s", proc_mounts); | |
1059 | goto error; | |
1060 | } | |
1061 | ||
1062 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1063 | if (strstr(line, "debugfs") != NULL) { | |
1064 | /* Remove first string */ | |
1065 | strtok(line, " "); | |
1066 | /* Dup string here so we can reuse line later on */ | |
1067 | debugfs_path = strdup(strtok(NULL, " ")); | |
1068 | DBG("Got debugfs path : %s", debugfs_path); | |
1069 | break; | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | fclose(fp); | |
1074 | ||
1075 | /* Mount debugfs if needded */ | |
1076 | if (debugfs_path == NULL) { | |
1077 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1078 | if (ret < 0) { | |
1079 | perror("asprintf debugfs path"); | |
1080 | goto error; | |
1081 | } | |
1082 | ret = mount_debugfs(debugfs_path); | |
1083 | if (ret < 0) { | |
1084 | goto error; | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | /* Modprobe lttng kernel modules */ | |
1089 | ret = modprobe_kernel_modules(); | |
1090 | if (ret < 0) { | |
1091 | goto error; | |
1092 | } | |
1093 | ||
1094 | /* Setup lttng kernel path */ | |
1095 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1096 | if (ret < 0) { | |
1097 | perror("asprintf lttng path"); | |
1098 | goto error; | |
1099 | } | |
1100 | ||
1101 | /* Open debugfs lttng */ | |
1102 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1103 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1104 | DBG("Failed to open %s", lttng_path); |
1105 | goto error; | |
8c0faa1d DG |
1106 | } |
1107 | ||
b73401da DG |
1108 | free(lttng_path); |
1109 | free(debugfs_path); | |
f3ed775e | 1110 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1111 | return; |
1112 | ||
1113 | error: | |
1114 | if (lttng_path) { | |
1115 | free(lttng_path); | |
1116 | } | |
1117 | if (debugfs_path) { | |
1118 | free(debugfs_path); | |
1119 | } | |
1120 | WARN("No kernel tracer available"); | |
1121 | kernel_tracer_fd = 0; | |
1122 | return; | |
f3ed775e | 1123 | } |
33a2b854 | 1124 | |
f3ed775e | 1125 | /* |
d063d709 DG |
1126 | * Start tracing by creating trace directory and sending FDs to the kernel |
1127 | * consumer. | |
f3ed775e DG |
1128 | */ |
1129 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1130 | { | |
f40799e8 | 1131 | int ret = 0; |
8c0faa1d | 1132 | |
f3ed775e DG |
1133 | if (session->kconsumer_fds_sent == 0) { |
1134 | ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session); | |
1135 | if (ret < 0) { | |
1136 | ERR("Send kconsumerd fds failed"); | |
1137 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1138 | goto error; | |
1139 | } | |
1d4b027a | 1140 | |
f3ed775e DG |
1141 | session->kconsumer_fds_sent = 1; |
1142 | } | |
1d4b027a DG |
1143 | |
1144 | error: | |
1145 | return ret; | |
8c0faa1d DG |
1146 | } |
1147 | ||
7a485870 DG |
1148 | /* |
1149 | * Notify kernel thread to update it's pollfd. | |
1150 | */ | |
1151 | static int notify_kernel_pollfd(void) | |
1152 | { | |
1153 | int ret; | |
1154 | ||
1155 | /* Inform kernel thread of the new kernel channel */ | |
1156 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1157 | if (ret < 0) { | |
1158 | perror("write kernel poll pipe"); | |
1159 | } | |
1160 | ||
1161 | return ret; | |
1162 | } | |
1163 | ||
8c0faa1d | 1164 | /* |
d063d709 | 1165 | * Allocate a channel structure and fill it. |
8c0faa1d | 1166 | */ |
ed8f384d | 1167 | static struct lttng_channel *init_default_channel(char *name) |
8c0faa1d | 1168 | { |
f3ed775e | 1169 | struct lttng_channel *chan; |
1d4b027a | 1170 | |
f3ed775e DG |
1171 | chan = malloc(sizeof(struct lttng_channel)); |
1172 | if (chan == NULL) { | |
1173 | perror("init channel malloc"); | |
1174 | goto error; | |
8c0faa1d | 1175 | } |
1d4b027a | 1176 | |
ed8f384d | 1177 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1178 | perror("snprintf channel name"); |
f3ed775e DG |
1179 | return NULL; |
1180 | } | |
1181 | ||
1182 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1183 | chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; | |
1184 | chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; | |
1185 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
1186 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 1187 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
1d4b027a DG |
1188 | |
1189 | error: | |
f3ed775e | 1190 | return chan; |
8c0faa1d DG |
1191 | } |
1192 | ||
333f285e | 1193 | /* |
d063d709 | 1194 | * Create a kernel tracer session then create the default channel. |
333f285e | 1195 | */ |
f3ed775e | 1196 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1197 | { |
f3ed775e | 1198 | int ret; |
f3ed775e DG |
1199 | |
1200 | DBG("Creating kernel session"); | |
1201 | ||
1202 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1203 | if (ret < 0) { | |
1204 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1205 | goto error; | |
333f285e DG |
1206 | } |
1207 | ||
7a485870 DG |
1208 | ret = mkdir_recursive(session->path, S_IRWXU | S_IRWXG ); |
1209 | if (ret < 0) { | |
1210 | if (ret != EEXIST) { | |
1211 | ERR("Trace directory creation error"); | |
1212 | goto error; | |
1213 | } | |
1214 | } | |
1215 | ||
f3ed775e DG |
1216 | error: |
1217 | return ret; | |
333f285e DG |
1218 | } |
1219 | ||
6c9cc2ab DG |
1220 | /* |
1221 | * Using the session list, filled a lttng_session array to send back to the | |
1222 | * client for session listing. | |
1223 | * | |
1224 | * The session list lock MUST be acquired before calling this function. Use | |
1225 | * lock_session_list() and unlock_session_list(). | |
1226 | */ | |
1227 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1228 | { | |
1229 | int i = 0; | |
1230 | struct ltt_session *session; | |
1231 | ||
1232 | DBG("Getting all available session"); | |
1233 | /* | |
1234 | * Iterate over session list and append data after the control struct in | |
1235 | * the buffer. | |
1236 | */ | |
1237 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1238 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
1239 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
1240 | i++; | |
1241 | } | |
1242 | } | |
1243 | ||
9f19cc17 DG |
1244 | /* |
1245 | * Fill lttng_channel array of all channels. | |
1246 | */ | |
1247 | static void list_lttng_channels(struct ltt_session *session, | |
1248 | struct lttng_channel *channels) | |
1249 | { | |
1250 | int i = 0; | |
1251 | struct ltt_kernel_channel *kchan; | |
1252 | ||
1253 | DBG("Listing channels for session %s", session->name); | |
1254 | ||
1255 | /* Kernel channels */ | |
1256 | if (session->kernel_session != NULL) { | |
1257 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1258 | /* Copy lttng_channel struct to array */ | |
1259 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1260 | channels[i].enabled = kchan->enabled; | |
1261 | i++; | |
1262 | } | |
1263 | } | |
1264 | ||
1265 | /* TODO: Missing UST listing */ | |
1266 | } | |
1267 | ||
1268 | /* | |
1269 | * Fill lttng_event array of all events in the channel. | |
1270 | */ | |
1271 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1272 | struct lttng_event *events) | |
1273 | { | |
1274 | /* | |
1275 | * TODO: This is ONLY kernel. Need UST support. | |
1276 | */ | |
1277 | int i = 0; | |
1278 | struct ltt_kernel_event *event; | |
1279 | ||
1280 | DBG("Listing events for channel %s", kchan->channel->name); | |
1281 | ||
1282 | /* Kernel channels */ | |
1283 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1284 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
1285 | events[i].enabled = event->enabled; | |
1286 | switch (event->event->instrumentation) { | |
1287 | case LTTNG_KERNEL_TRACEPOINT: | |
1288 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1289 | break; | |
1290 | case LTTNG_KERNEL_KPROBE: | |
1291 | case LTTNG_KERNEL_KRETPROBE: | |
1292 | events[i].type = LTTNG_EVENT_PROBE; | |
1293 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1294 | sizeof(struct lttng_kernel_kprobe)); | |
1295 | break; | |
1296 | case LTTNG_KERNEL_FUNCTION: | |
1297 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1298 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1299 | sizeof(struct lttng_kernel_function)); | |
1300 | break; | |
1301 | } | |
1302 | i++; | |
1303 | } | |
1304 | } | |
1305 | ||
fac6795d | 1306 | /* |
d063d709 DG |
1307 | * Process the command requested by the lttng client within the command |
1308 | * context structure. This function make sure that the return structure (llm) | |
1309 | * is set and ready for transmission before returning. | |
fac6795d | 1310 | * |
e065084a | 1311 | * Return any error encountered or 0 for success. |
fac6795d | 1312 | */ |
5461b305 | 1313 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1314 | { |
f40799e8 | 1315 | int ret = LTTCOMM_OK; |
fac6795d | 1316 | |
5461b305 | 1317 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1318 | |
f3ed775e | 1319 | /* Listing commands don't need a session */ |
5461b305 | 1320 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1321 | case LTTNG_CREATE_SESSION: |
1322 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1323 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1324 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1325 | break; |
1326 | default: | |
42abccdb DG |
1327 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1328 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1329 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1330 | /* If session name not found */ |
42abccdb | 1331 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1332 | ret = LTTCOMM_SESS_NOT_FOUND; |
1333 | } else { /* If no session name specified */ | |
1334 | ret = LTTCOMM_SELECT_SESS; | |
1335 | } | |
5461b305 | 1336 | goto error; |
b5541356 DG |
1337 | } else { |
1338 | /* Acquire lock for the session */ | |
1339 | lock_session(cmd_ctx->session); | |
379473d2 | 1340 | } |
5e16da05 | 1341 | break; |
379473d2 DG |
1342 | } |
1343 | ||
f3ed775e | 1344 | /* |
d0254c7c | 1345 | * Check domain type for specific "pre-action". |
f3ed775e | 1346 | */ |
0d0c377a DG |
1347 | switch (cmd_ctx->lsm->domain.type) { |
1348 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1349 | /* Kernel tracer check */ |
20fe2104 | 1350 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1351 | init_kernel_tracer(); |
1352 | if (kernel_tracer_fd == 0) { | |
1353 | ret = LTTCOMM_KERN_NA; | |
1354 | goto error; | |
1355 | } | |
20fe2104 | 1356 | } |
f3ed775e DG |
1357 | |
1358 | /* Need a session for kernel command */ | |
d0254c7c MD |
1359 | switch (cmd_ctx->lsm->cmd_type) { |
1360 | case LTTNG_CREATE_SESSION: | |
1361 | case LTTNG_LIST_SESSIONS: | |
1362 | case LTTNG_LIST_TRACEPOINTS: | |
1363 | case LTTNG_CALIBRATE: | |
1364 | break; | |
1365 | default: | |
1366 | if (cmd_ctx->session->kernel_session == NULL) { | |
1367 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1368 | if (ret < 0) { |
d0254c7c | 1369 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1370 | goto error; |
1371 | } | |
d0254c7c MD |
1372 | |
1373 | /* Start the kernel consumer daemon */ | |
1374 | if (kconsumerd_pid == 0) { | |
1375 | ret = start_kconsumerd(); | |
1376 | if (ret < 0) { | |
1377 | goto error; | |
1378 | } | |
1379 | } | |
f3ed775e DG |
1380 | } |
1381 | } | |
0d0c377a DG |
1382 | break; |
1383 | default: | |
1384 | break; | |
20fe2104 DG |
1385 | } |
1386 | ||
fac6795d | 1387 | /* Process by command type */ |
5461b305 | 1388 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1389 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1390 | { |
b579acd9 | 1391 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1392 | |
1393 | /* Setup lttng message with no payload */ | |
1394 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1395 | if (ret < 0) { | |
1396 | goto setup_error; | |
1397 | } | |
1398 | ||
b579acd9 DG |
1399 | switch (cmd_ctx->lsm->domain.type) { |
1400 | case LTTNG_DOMAIN_KERNEL: | |
1401 | /* Create Kernel context */ | |
1402 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1403 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1404 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1405 | strncpy(kctx.u.perf_counter.name, | |
1406 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1407 | LTTNG_SYMBOL_NAME_LEN); | |
1408 | ||
1409 | /* Add kernel context to kernel tracer. See context.c */ | |
1410 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1411 | cmd_ctx->lsm->u.context.event_name, | |
1412 | cmd_ctx->lsm->u.context.channel_name); | |
1413 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1414 | goto error; |
1415 | } | |
b579acd9 DG |
1416 | break; |
1417 | default: | |
1418 | /* TODO: Userspace tracing */ | |
1419 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1420 | goto error; |
d65106b1 DG |
1421 | } |
1422 | ||
1423 | ret = LTTCOMM_OK; | |
1424 | break; | |
1425 | } | |
0b97ec54 | 1426 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1427 | { |
0b97ec54 | 1428 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1429 | |
1430 | /* Setup lttng message with no payload */ | |
1431 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1432 | if (ret < 0) { | |
1433 | goto setup_error; | |
1434 | } | |
1435 | ||
0b97ec54 DG |
1436 | switch (cmd_ctx->lsm->domain.type) { |
1437 | case LTTNG_DOMAIN_KERNEL: | |
1438 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1439 | cmd_ctx->session->kernel_session); | |
1440 | if (kchan == NULL) { | |
1441 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1442 | goto error; |
0b97ec54 DG |
1443 | } else if (kchan->enabled == 1) { |
1444 | ret = kernel_disable_channel(kchan); | |
1445 | if (ret < 0) { | |
1446 | if (ret != EEXIST) { | |
1447 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1448 | } | |
1449 | goto error; | |
1450 | } | |
26cc6b4e | 1451 | } |
0b97ec54 DG |
1452 | kernel_wait_quiescent(kernel_tracer_fd); |
1453 | break; | |
1454 | default: | |
1455 | /* TODO: Userspace tracing */ | |
1456 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1457 | goto error; | |
26cc6b4e DG |
1458 | } |
1459 | ||
26cc6b4e DG |
1460 | ret = LTTCOMM_OK; |
1461 | break; | |
1462 | } | |
f5177a38 | 1463 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1464 | { |
f5177a38 DG |
1465 | struct ltt_kernel_channel *kchan; |
1466 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1467 | |
1468 | /* Setup lttng message with no payload */ | |
1469 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1470 | if (ret < 0) { | |
1471 | goto setup_error; | |
1472 | } | |
1473 | ||
f5177a38 DG |
1474 | switch (cmd_ctx->lsm->domain.type) { |
1475 | case LTTNG_DOMAIN_KERNEL: | |
1476 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1477 | cmd_ctx->session->kernel_session); | |
1478 | if (kchan == NULL) { | |
1479 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1480 | goto error; |
e953ef25 | 1481 | } |
f5177a38 DG |
1482 | |
1483 | kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); | |
1484 | if (kevent != NULL) { | |
1485 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1486 | kchan->channel->name); | |
1487 | ret = kernel_disable_event(kevent); | |
1488 | if (ret < 0) { | |
1489 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1490 | goto error; | |
1491 | } | |
1492 | } | |
1493 | ||
1494 | kernel_wait_quiescent(kernel_tracer_fd); | |
1495 | break; | |
1496 | default: | |
1497 | /* TODO: Userspace tracing */ | |
1498 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1499 | goto error; | |
e953ef25 DG |
1500 | } |
1501 | ||
19e70852 | 1502 | ret = LTTCOMM_OK; |
e953ef25 DG |
1503 | break; |
1504 | } | |
f5177a38 | 1505 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1506 | { |
f5177a38 DG |
1507 | struct ltt_kernel_channel *kchan; |
1508 | struct ltt_kernel_event *kevent; | |
950131af DG |
1509 | |
1510 | /* Setup lttng message with no payload */ | |
1511 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1512 | if (ret < 0) { | |
1513 | goto setup_error; | |
1514 | } | |
1515 | ||
f5177a38 DG |
1516 | switch (cmd_ctx->lsm->domain.type) { |
1517 | case LTTNG_DOMAIN_KERNEL: | |
1518 | DBG("Disabling all enabled kernel events"); | |
1519 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1520 | cmd_ctx->session->kernel_session); | |
1521 | if (kchan == NULL) { | |
1522 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1523 | goto error; | |
1524 | } | |
950131af | 1525 | |
f5177a38 DG |
1526 | /* For each event in the kernel session */ |
1527 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1528 | DBG("Disabling kernel event %s for channel %s.", | |
1529 | kevent->event->name, kchan->channel->name); | |
1530 | ret = kernel_disable_event(kevent); | |
1531 | if (ret < 0) { | |
1532 | continue; | |
1533 | } | |
950131af | 1534 | } |
f5177a38 DG |
1535 | |
1536 | /* Quiescent wait after event disable */ | |
1537 | kernel_wait_quiescent(kernel_tracer_fd); | |
1538 | break; | |
1539 | default: | |
1540 | /* TODO: Userspace tracing */ | |
1541 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1542 | goto error; | |
950131af DG |
1543 | } |
1544 | ||
950131af DG |
1545 | ret = LTTCOMM_OK; |
1546 | break; | |
1547 | } | |
0d0c377a | 1548 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 1549 | { |
0d0c377a | 1550 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
1551 | |
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 | ||
0d0c377a DG |
1558 | switch (cmd_ctx->lsm->domain.type) { |
1559 | case LTTNG_DOMAIN_KERNEL: | |
1560 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, | |
1561 | cmd_ctx->session->kernel_session); | |
1562 | if (kchan == NULL) { | |
1563 | /* Channel not found, creating it */ | |
1564 | DBG("Creating kernel channel"); | |
7d29a247 | 1565 | |
0d0c377a DG |
1566 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
1567 | &cmd_ctx->lsm->u.channel.chan, cmd_ctx->session->path); | |
1568 | if (ret < 0) { | |
1569 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1570 | goto error; | |
1571 | } | |
7d29a247 | 1572 | |
0d0c377a DG |
1573 | /* Notify kernel thread that there is a new channel */ |
1574 | ret = notify_kernel_pollfd(); | |
1575 | if (ret < 0) { | |
1576 | ret = LTTCOMM_FATAL; | |
1577 | goto error; | |
1578 | } | |
1579 | } else if (kchan->enabled == 0) { | |
1580 | ret = kernel_enable_channel(kchan); | |
1581 | if (ret < 0) { | |
1582 | if (ret != EEXIST) { | |
1583 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
1584 | } | |
1585 | goto error; | |
d36b8583 | 1586 | } |
d36b8583 | 1587 | } |
0d0c377a DG |
1588 | |
1589 | kernel_wait_quiescent(kernel_tracer_fd); | |
1590 | break; | |
1591 | default: | |
1592 | /* TODO: Userspace tracing */ | |
1593 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1594 | goto error; | |
d36b8583 DG |
1595 | } |
1596 | ||
d36b8583 DG |
1597 | ret = LTTCOMM_OK; |
1598 | break; | |
1599 | } | |
0d0c377a | 1600 | case LTTNG_ENABLE_EVENT: |
894be886 | 1601 | { |
7d29a247 DG |
1602 | char *channel_name; |
1603 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 1604 | struct ltt_kernel_event *kevent; |
7d29a247 | 1605 | struct lttng_channel *chan; |
f3ed775e | 1606 | |
894be886 DG |
1607 | /* Setup lttng message with no payload */ |
1608 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1609 | if (ret < 0) { | |
1610 | goto setup_error; | |
1611 | } | |
1612 | ||
7d29a247 DG |
1613 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1614 | ||
0d0c377a DG |
1615 | switch (cmd_ctx->lsm->domain.type) { |
1616 | case LTTNG_DOMAIN_KERNEL: | |
1617 | do { | |
1618 | kchan = get_kernel_channel_by_name(channel_name, | |
1619 | cmd_ctx->session->kernel_session); | |
1620 | if (kchan == NULL) { | |
1621 | DBG("Channel not found. Creating channel %s", channel_name); | |
1622 | ||
1623 | chan = init_default_channel(channel_name); | |
1624 | if (chan == NULL) { | |
1625 | ret = LTTCOMM_FATAL; | |
1626 | goto error; | |
1627 | } | |
7d29a247 | 1628 | |
0d0c377a DG |
1629 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
1630 | chan, cmd_ctx->session->path); | |
1631 | if (ret < 0) { | |
1632 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1633 | goto error; | |
1634 | } | |
7d29a247 | 1635 | } |
0d0c377a | 1636 | } while (kchan == NULL); |
7d29a247 | 1637 | |
0d0c377a DG |
1638 | kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
1639 | if (kevent == NULL) { | |
1640 | DBG("Creating kernel event %s for channel %s.", | |
1641 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
1642 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
1643 | } else { | |
1644 | DBG("Enabling kernel event %s for channel %s.", | |
1645 | kevent->event->name, channel_name); | |
1646 | ret = kernel_enable_event(kevent); | |
1647 | if (ret == -EEXIST) { | |
1648 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
1649 | goto error; |
1650 | } | |
1651 | } | |
f34daff7 | 1652 | |
0d0c377a DG |
1653 | if (ret < 0) { |
1654 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
1655 | goto error; |
1656 | } | |
19e70852 | 1657 | |
0d0c377a DG |
1658 | kernel_wait_quiescent(kernel_tracer_fd); |
1659 | break; | |
1660 | default: | |
1661 | /* TODO: Userspace tracing */ | |
1662 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 1663 | goto error; |
f3ed775e | 1664 | } |
19e70852 | 1665 | ret = LTTCOMM_OK; |
894be886 DG |
1666 | break; |
1667 | } | |
0d0c377a | 1668 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 1669 | { |
9f19cc17 DG |
1670 | int size, i; |
1671 | char *channel_name; | |
7d29a247 | 1672 | struct ltt_kernel_channel *kchan; |
0d0c377a | 1673 | struct ltt_kernel_event *kevent; |
9f19cc17 | 1674 | struct lttng_event *event_list; |
7d29a247 | 1675 | struct lttng_channel *chan; |
33a2b854 DG |
1676 | |
1677 | /* Setup lttng message with no payload */ | |
1678 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1679 | if (ret < 0) { | |
1680 | goto setup_error; | |
1681 | } | |
1682 | ||
1683 | DBG("Enabling all kernel event"); | |
1684 | ||
7d29a247 DG |
1685 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1686 | ||
0d0c377a DG |
1687 | switch (cmd_ctx->lsm->domain.type) { |
1688 | case LTTNG_DOMAIN_KERNEL: | |
1689 | do { | |
1690 | kchan = get_kernel_channel_by_name(channel_name, | |
1691 | cmd_ctx->session->kernel_session); | |
1692 | if (kchan == NULL) { | |
1693 | DBG("Channel not found. Creating channel %s", channel_name); | |
1694 | ||
1695 | chan = init_default_channel(channel_name); | |
1696 | if (chan == NULL) { | |
1697 | ret = LTTCOMM_FATAL; | |
1698 | goto error; | |
1699 | } | |
7d29a247 | 1700 | |
0d0c377a DG |
1701 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
1702 | chan, cmd_ctx->session->path); | |
1703 | if (ret < 0) { | |
1704 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1705 | goto error; | |
1706 | } | |
7d29a247 | 1707 | } |
0d0c377a | 1708 | } while (kchan == NULL); |
7d29a247 | 1709 | |
0d0c377a DG |
1710 | /* For each event in the kernel session */ |
1711 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1712 | DBG("Enabling kernel event %s for channel %s.", | |
1713 | kevent->event->name, channel_name); | |
1714 | ret = kernel_enable_event(kevent); | |
7d29a247 | 1715 | if (ret < 0) { |
0d0c377a | 1716 | continue; |
7d29a247 DG |
1717 | } |
1718 | } | |
33a2b854 | 1719 | |
0d0c377a DG |
1720 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
1721 | if (size < 0) { | |
1722 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1723 | goto error; | |
f3ed775e | 1724 | } |
f3ed775e | 1725 | |
0d0c377a DG |
1726 | for (i = 0; i < size; i++) { |
1727 | kevent = get_kernel_event_by_name(event_list[i].name, kchan); | |
1728 | if (kevent == NULL) { | |
1729 | /* Default event type for enable all */ | |
1730 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
1731 | /* Enable each single tracepoint event */ | |
1732 | ret = kernel_create_event(&event_list[i], kchan); | |
1733 | if (ret < 0) { | |
1734 | /* Ignore error here and continue */ | |
1735 | } | |
950131af | 1736 | } |
33a2b854 | 1737 | } |
33a2b854 | 1738 | |
0d0c377a DG |
1739 | free(event_list); |
1740 | ||
1741 | /* Quiescent wait after event enable */ | |
1742 | kernel_wait_quiescent(kernel_tracer_fd); | |
1743 | break; | |
1744 | default: | |
1745 | /* TODO: Userspace tracing */ | |
1746 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1747 | goto error; | |
1748 | } | |
33a2b854 DG |
1749 | |
1750 | ret = LTTCOMM_OK; | |
1751 | break; | |
1752 | } | |
052da939 | 1753 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 1754 | { |
9f19cc17 | 1755 | struct lttng_event *events; |
052da939 DG |
1756 | ssize_t nb_events = 0; |
1757 | ||
1758 | switch (cmd_ctx->lsm->domain.type) { | |
1759 | case LTTNG_DOMAIN_KERNEL: | |
1760 | DBG("Listing kernel events"); | |
1761 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
1762 | if (nb_events < 0) { | |
1763 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1764 | goto error; | |
1765 | } | |
1766 | break; | |
1767 | default: | |
1768 | /* TODO: Userspace listing */ | |
1769 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1770 | break; | |
2ef84c95 DG |
1771 | } |
1772 | ||
1773 | /* | |
1774 | * Setup lttng message with payload size set to the event list size in | |
1775 | * bytes and then copy list into the llm payload. | |
1776 | */ | |
052da939 | 1777 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 1778 | if (ret < 0) { |
052da939 | 1779 | free(events); |
2ef84c95 DG |
1780 | goto setup_error; |
1781 | } | |
1782 | ||
1783 | /* Copy event list into message payload */ | |
9f19cc17 | 1784 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 1785 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 1786 | |
9f19cc17 | 1787 | free(events); |
2ef84c95 DG |
1788 | |
1789 | ret = LTTCOMM_OK; | |
1790 | break; | |
1791 | } | |
f3ed775e | 1792 | case LTTNG_START_TRACE: |
8c0faa1d DG |
1793 | { |
1794 | struct ltt_kernel_channel *chan; | |
f3ed775e | 1795 | |
8c0faa1d 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 DG |
1802 | /* Kernel tracing */ |
1803 | if (cmd_ctx->session->kernel_session != NULL) { | |
1804 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
1805 | DBG("Open kernel metadata"); | |
58a97671 DG |
1806 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
1807 | cmd_ctx->session->path); | |
f3ed775e DG |
1808 | if (ret < 0) { |
1809 | ret = LTTCOMM_KERN_META_FAIL; | |
1810 | goto error; | |
1811 | } | |
1812 | } | |
8c0faa1d | 1813 | |
f3ed775e DG |
1814 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
1815 | DBG("Opening kernel metadata stream"); | |
1816 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
1817 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
1818 | if (ret < 0) { | |
1819 | ERR("Kernel create metadata stream failed"); | |
1820 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1821 | goto error; | |
1822 | } | |
1823 | } | |
1824 | } | |
8c0faa1d | 1825 | |
f3ed775e | 1826 | /* For each channel */ |
0d0c377a DG |
1827 | cds_list_for_each_entry(chan, |
1828 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
1829 | if (chan->stream_count == 0) { |
1830 | ret = kernel_open_channel_stream(chan); | |
1831 | if (ret < 0) { | |
1832 | ERR("Kernel create channel stream failed"); | |
1833 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1834 | goto error; | |
1835 | } | |
1836 | /* Update the stream global counter */ | |
1837 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
1838 | } | |
1839 | } | |
1840 | ||
1841 | DBG("Start kernel tracing"); | |
1842 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
8c0faa1d | 1843 | if (ret < 0) { |
f3ed775e DG |
1844 | ERR("Kernel start session failed"); |
1845 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1846 | goto error; |
1847 | } | |
8c0faa1d | 1848 | |
f3ed775e DG |
1849 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
1850 | if (ret < 0) { | |
1851 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1852 | goto error; |
1853 | } | |
8c0faa1d | 1854 | |
f3ed775e DG |
1855 | /* Quiescent wait after starting trace */ |
1856 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1857 | } |
1858 | ||
f3ed775e | 1859 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
1860 | |
1861 | ret = LTTCOMM_OK; | |
1862 | break; | |
1863 | } | |
f3ed775e | 1864 | case LTTNG_STOP_TRACE: |
8c0faa1d | 1865 | { |
f3ed775e | 1866 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
1867 | /* Setup lttng message with no payload */ |
1868 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1869 | if (ret < 0) { | |
1870 | goto setup_error; | |
1871 | } | |
1872 | ||
f3ed775e DG |
1873 | /* Kernel tracer */ |
1874 | if (cmd_ctx->session->kernel_session != NULL) { | |
1875 | DBG("Stop kernel tracing"); | |
84291629 | 1876 | |
f3ed775e DG |
1877 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
1878 | if (ret < 0) { | |
1879 | ERR("Kernel metadata flush failed"); | |
1880 | } | |
8c0faa1d | 1881 | |
f3ed775e DG |
1882 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
1883 | ret = kernel_flush_buffer(chan); | |
1884 | if (ret < 0) { | |
1885 | ERR("Kernel flush buffer error"); | |
1886 | } | |
1887 | } | |
1888 | ||
1889 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
1890 | if (ret < 0) { | |
1891 | ERR("Kernel stop session failed"); | |
1892 | ret = LTTCOMM_KERN_STOP_FAIL; | |
1893 | goto error; | |
1894 | } | |
1895 | ||
1896 | /* Quiescent wait after stopping trace */ | |
1897 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1898 | } |
1899 | ||
f3ed775e | 1900 | /* TODO : User-space tracer */ |
8c0faa1d DG |
1901 | |
1902 | ret = LTTCOMM_OK; | |
1903 | break; | |
1904 | } | |
5e16da05 MD |
1905 | case LTTNG_CREATE_SESSION: |
1906 | { | |
5461b305 DG |
1907 | /* Setup lttng message with no payload */ |
1908 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1909 | if (ret < 0) { | |
1910 | goto setup_error; | |
1911 | } | |
1912 | ||
42abccdb | 1913 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
5e16da05 | 1914 | if (ret < 0) { |
f3ed775e | 1915 | if (ret == -EEXIST) { |
5e16da05 MD |
1916 | ret = LTTCOMM_EXIST_SESS; |
1917 | } else { | |
aaf97519 | 1918 | ret = LTTCOMM_FATAL; |
aaf97519 | 1919 | } |
5461b305 | 1920 | goto error; |
8028d920 | 1921 | } |
1657e9bb | 1922 | |
5461b305 | 1923 | ret = LTTCOMM_OK; |
5e16da05 MD |
1924 | break; |
1925 | } | |
1926 | case LTTNG_DESTROY_SESSION: | |
1927 | { | |
5461b305 DG |
1928 | /* Setup lttng message with no payload */ |
1929 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1930 | if (ret < 0) { | |
1931 | goto setup_error; | |
1932 | } | |
1933 | ||
f3ed775e DG |
1934 | /* Clean kernel session teardown */ |
1935 | teardown_kernel_session(cmd_ctx->session); | |
1936 | ||
42abccdb | 1937 | ret = destroy_session(cmd_ctx->lsm->session.name); |
5e16da05 | 1938 | if (ret < 0) { |
f3ed775e | 1939 | ret = LTTCOMM_FATAL; |
5461b305 | 1940 | goto error; |
5e16da05 | 1941 | } |
1657e9bb | 1942 | |
7a485870 DG |
1943 | /* |
1944 | * Must notify the kernel thread here to update it's pollfd in order to | |
1945 | * remove the channel(s)' fd just destroyed. | |
1946 | */ | |
1947 | ret = notify_kernel_pollfd(); | |
1948 | if (ret < 0) { | |
1949 | ret = LTTCOMM_FATAL; | |
1950 | goto error; | |
1951 | } | |
1952 | ||
5461b305 DG |
1953 | ret = LTTCOMM_OK; |
1954 | break; | |
5e16da05 | 1955 | } |
9f19cc17 | 1956 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 1957 | { |
4b222185 | 1958 | size_t nb_dom = 0; |
5461b305 | 1959 | |
9f19cc17 DG |
1960 | if (cmd_ctx->session->kernel_session != NULL) { |
1961 | nb_dom++; | |
ce3d728c | 1962 | } |
520ff687 | 1963 | |
9f19cc17 DG |
1964 | nb_dom += cmd_ctx->session->ust_trace_count; |
1965 | ||
1966 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
1967 | if (ret < 0) { |
1968 | goto setup_error; | |
520ff687 | 1969 | } |
57167058 | 1970 | |
9f19cc17 DG |
1971 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
1972 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 1973 | |
9f19cc17 | 1974 | /* TODO: User-space tracer domain support */ |
5461b305 | 1975 | ret = LTTCOMM_OK; |
5e16da05 MD |
1976 | break; |
1977 | } | |
9f19cc17 | 1978 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 1979 | { |
9f19cc17 DG |
1980 | /* |
1981 | * TODO: Only kernel channels are listed here. UST listing | |
1982 | * is needed on lttng-ust 2.0 release. | |
1983 | */ | |
1984 | size_t nb_chan = 0; | |
1985 | if (cmd_ctx->session->kernel_session != NULL) { | |
1986 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 1987 | } |
ca95a216 | 1988 | |
9f19cc17 DG |
1989 | ret = setup_lttng_msg(cmd_ctx, |
1990 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
1991 | if (ret < 0) { |
1992 | goto setup_error; | |
1993 | } | |
9f19cc17 DG |
1994 | |
1995 | list_lttng_channels(cmd_ctx->session, | |
1996 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
1997 | ||
1998 | ret = LTTCOMM_OK; | |
5461b305 | 1999 | break; |
5e16da05 | 2000 | } |
9f19cc17 | 2001 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2002 | { |
9f19cc17 DG |
2003 | /* |
2004 | * TODO: Only kernel events are listed here. UST listing | |
2005 | * is needed on lttng-ust 2.0 release. | |
2006 | */ | |
2007 | size_t nb_event = 0; | |
2008 | struct ltt_kernel_channel *kchan = NULL; | |
2009 | ||
2010 | if (cmd_ctx->session->kernel_session != NULL) { | |
2011 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.list.channel_name, | |
2012 | cmd_ctx->session->kernel_session); | |
2013 | if (kchan == NULL) { | |
2014 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2015 | goto error; | |
2016 | } | |
2017 | nb_event += kchan->event_count; | |
5461b305 | 2018 | } |
ca95a216 | 2019 | |
9f19cc17 DG |
2020 | ret = setup_lttng_msg(cmd_ctx, |
2021 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2022 | if (ret < 0) { |
2023 | goto setup_error; | |
2024 | } | |
9f19cc17 DG |
2025 | |
2026 | DBG("Listing events (%ld events)", nb_event); | |
2027 | ||
2028 | list_lttng_events(kchan, | |
2029 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2030 | ||
2031 | ret = LTTCOMM_OK; | |
5461b305 | 2032 | break; |
5e16da05 MD |
2033 | } |
2034 | case LTTNG_LIST_SESSIONS: | |
2035 | { | |
6c9cc2ab | 2036 | lock_session_list(); |
5461b305 | 2037 | |
6c9cc2ab | 2038 | if (session_list_ptr->count == 0) { |
f3ed775e | 2039 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2040 | unlock_session_list(); |
5461b305 | 2041 | goto error; |
57167058 | 2042 | } |
5e16da05 | 2043 | |
6c9cc2ab DG |
2044 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2045 | session_list_ptr->count); | |
5461b305 | 2046 | if (ret < 0) { |
36a83748 | 2047 | unlock_session_list(); |
5461b305 | 2048 | goto setup_error; |
e065084a | 2049 | } |
5e16da05 | 2050 | |
6c9cc2ab DG |
2051 | /* Filled the session array */ |
2052 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2053 | ||
2054 | unlock_session_list(); | |
5e16da05 | 2055 | |
5461b305 | 2056 | ret = LTTCOMM_OK; |
5e16da05 MD |
2057 | break; |
2058 | } | |
d0254c7c MD |
2059 | |
2060 | case LTTNG_CALIBRATE: | |
2061 | { | |
2062 | /* Setup lttng message with no payload */ | |
2063 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2064 | if (ret < 0) { | |
2065 | goto setup_error; | |
2066 | } | |
2067 | ||
2068 | switch (cmd_ctx->lsm->domain.type) { | |
2069 | case LTTNG_DOMAIN_KERNEL: | |
2070 | { | |
2071 | struct lttng_kernel_calibrate kcalibrate; | |
2072 | ||
2073 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2074 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2075 | if (ret < 0) { | |
2076 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2077 | goto error; | |
2078 | } | |
2079 | break; | |
2080 | } | |
2081 | default: | |
2082 | /* TODO: Userspace tracing */ | |
2083 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2084 | goto error; | |
2085 | } | |
2086 | ret = LTTCOMM_OK; | |
2087 | break; | |
2088 | } | |
2089 | ||
5e16da05 MD |
2090 | default: |
2091 | /* Undefined command */ | |
5461b305 DG |
2092 | ret = setup_lttng_msg(cmd_ctx, 0); |
2093 | if (ret < 0) { | |
2094 | goto setup_error; | |
2095 | } | |
2096 | ||
5e16da05 | 2097 | ret = LTTCOMM_UND; |
5461b305 | 2098 | break; |
fac6795d DG |
2099 | } |
2100 | ||
5461b305 DG |
2101 | /* Set return code */ |
2102 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2103 | |
b5541356 DG |
2104 | if (cmd_ctx->session) { |
2105 | unlock_session(cmd_ctx->session); | |
2106 | } | |
2107 | ||
e065084a DG |
2108 | return ret; |
2109 | ||
5461b305 | 2110 | error: |
5461b305 DG |
2111 | if (cmd_ctx->llm == NULL) { |
2112 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2113 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2114 | goto setup_error; |
2115 | } | |
2116 | } | |
e065084a | 2117 | /* Notify client of error */ |
5461b305 | 2118 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2119 | |
5461b305 | 2120 | setup_error: |
b5541356 DG |
2121 | if (cmd_ctx->session) { |
2122 | unlock_session(cmd_ctx->session); | |
2123 | } | |
8028d920 | 2124 | return ret; |
fac6795d DG |
2125 | } |
2126 | ||
1d4b027a | 2127 | /* |
d063d709 DG |
2128 | * This thread manage all clients request using the unix client socket for |
2129 | * communication. | |
1d4b027a DG |
2130 | */ |
2131 | static void *thread_manage_clients(void *data) | |
2132 | { | |
273ea72c DG |
2133 | int sock = 0, ret; |
2134 | struct command_ctx *cmd_ctx = NULL; | |
2135 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2136 | |
2137 | DBG("[thread] Manage client started"); | |
2138 | ||
2139 | ret = lttcomm_listen_unix_sock(client_sock); | |
2140 | if (ret < 0) { | |
2141 | goto error; | |
2142 | } | |
2143 | ||
273ea72c DG |
2144 | /* First fd is always the quit pipe */ |
2145 | pollfd[0].fd = thread_quit_pipe[0]; | |
2146 | ||
2147 | /* Apps socket */ | |
2148 | pollfd[1].fd = client_sock; | |
2149 | pollfd[1].events = POLLIN; | |
2150 | ||
1d4b027a DG |
2151 | /* Notify parent pid that we are ready |
2152 | * to accept command for client side. | |
2153 | */ | |
2154 | if (opt_sig_parent) { | |
2155 | kill(ppid, SIGCHLD); | |
2156 | } | |
2157 | ||
2158 | while (1) { | |
1d4b027a | 2159 | DBG("Accepting client command ..."); |
273ea72c DG |
2160 | |
2161 | /* Inifinite blocking call, waiting for transmission */ | |
2162 | ret = poll(pollfd, 2, -1); | |
2163 | if (ret < 0) { | |
2164 | perror("poll client thread"); | |
2165 | goto error; | |
2166 | } | |
2167 | ||
2168 | /* Thread quit pipe has been closed. Killing thread. */ | |
2169 | if (pollfd[0].revents == POLLNVAL) { | |
2170 | goto error; | |
2171 | } else if (pollfd[1].revents == POLLERR) { | |
2172 | ERR("Client socket poll error"); | |
2173 | goto error; | |
2174 | } | |
2175 | ||
1d4b027a DG |
2176 | sock = lttcomm_accept_unix_sock(client_sock); |
2177 | if (sock < 0) { | |
2178 | goto error; | |
2179 | } | |
2180 | ||
2181 | /* Allocate context command to process the client request */ | |
2182 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2183 | ||
2184 | /* Allocate data buffer for reception */ | |
2185 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2186 | cmd_ctx->llm = NULL; | |
2187 | cmd_ctx->session = NULL; | |
2188 | ||
2189 | /* | |
2190 | * Data is received from the lttng client. The struct | |
2191 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2192 | * the client. | |
2193 | */ | |
2194 | DBG("Receiving data from client ..."); | |
2195 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2196 | if (ret <= 0) { | |
2197 | continue; | |
2198 | } | |
2199 | ||
f7776ea7 DG |
2200 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2201 | ||
1d4b027a DG |
2202 | /* |
2203 | * This function dispatch the work to the kernel or userspace tracer | |
2204 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2205 | * informations for the client. The command context struct contains | |
2206 | * everything this function may needs. | |
2207 | */ | |
2208 | ret = process_client_msg(cmd_ctx); | |
2209 | if (ret < 0) { | |
2210 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2211 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2212 | /* Error detected but still accept command */ | |
a2fb29a5 | 2213 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2214 | continue; |
2215 | } | |
2216 | ||
2217 | DBG("Sending response (size: %d, retcode: %d)", | |
2218 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2219 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2220 | if (ret < 0) { | |
2221 | ERR("Failed to send data back to client"); | |
2222 | } | |
2223 | ||
a2fb29a5 | 2224 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2225 | |
2226 | /* End of transmission */ | |
2227 | close(sock); | |
1d4b027a DG |
2228 | } |
2229 | ||
2230 | error: | |
273ea72c DG |
2231 | DBG("Client thread dying"); |
2232 | if (client_sock) { | |
2233 | close(client_sock); | |
2234 | } | |
2235 | if (sock) { | |
2236 | close(sock); | |
2237 | } | |
2238 | ||
2239 | unlink(client_unix_sock_path); | |
2240 | ||
a2fb29a5 | 2241 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2242 | return NULL; |
2243 | } | |
2244 | ||
2245 | ||
fac6795d DG |
2246 | /* |
2247 | * usage function on stderr | |
2248 | */ | |
2249 | static void usage(void) | |
2250 | { | |
b716ce68 | 2251 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2252 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2253 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2254 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2255 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2256 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2257 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2258 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2259 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2260 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2261 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2262 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
fac6795d DG |
2263 | } |
2264 | ||
2265 | /* | |
2266 | * daemon argument parsing | |
2267 | */ | |
2268 | static int parse_args(int argc, char **argv) | |
2269 | { | |
2270 | int c; | |
2271 | ||
2272 | static struct option long_options[] = { | |
2273 | { "client-sock", 1, 0, 'c' }, | |
2274 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2275 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2276 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2277 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2278 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2279 | { "help", 0, 0, 'h' }, |
2280 | { "group", 1, 0, 'g' }, | |
2281 | { "version", 0, 0, 'V' }, | |
75462a81 | 2282 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2283 | { "verbose", 0, 0, 'v' }, |
fac6795d DG |
2284 | { NULL, 0, 0, 0 } |
2285 | }; | |
2286 | ||
2287 | while (1) { | |
2288 | int option_index = 0; | |
d6f42150 | 2289 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index); |
fac6795d DG |
2290 | if (c == -1) { |
2291 | break; | |
2292 | } | |
2293 | ||
2294 | switch (c) { | |
2295 | case 0: | |
2296 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2297 | if (optarg) { | |
2298 | fprintf(stderr, " with arg %s\n", optarg); | |
2299 | } | |
2300 | break; | |
b716ce68 | 2301 | case 'c': |
fac6795d DG |
2302 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2303 | break; | |
2304 | case 'a': | |
2305 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2306 | break; | |
2307 | case 'd': | |
2308 | opt_daemon = 1; | |
2309 | break; | |
2310 | case 'g': | |
2311 | opt_tracing_group = strdup(optarg); | |
2312 | break; | |
2313 | case 'h': | |
2314 | usage(); | |
2315 | exit(EXIT_FAILURE); | |
2316 | case 'V': | |
2317 | fprintf(stdout, "%s\n", VERSION); | |
2318 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2319 | case 'S': |
2320 | opt_sig_parent = 1; | |
2321 | break; | |
d6f42150 DG |
2322 | case 'E': |
2323 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2324 | break; | |
2325 | case 'C': | |
2326 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2327 | break; | |
75462a81 DG |
2328 | case 'q': |
2329 | opt_quiet = 1; | |
2330 | break; | |
3f9947db | 2331 | case 'v': |
53086306 DG |
2332 | /* Verbose level can increase using multiple -v */ |
2333 | opt_verbose += 1; | |
3f9947db | 2334 | break; |
fac6795d DG |
2335 | default: |
2336 | /* Unknown option or other error. | |
2337 | * Error is printed by getopt, just return */ | |
2338 | return -1; | |
2339 | } | |
2340 | } | |
2341 | ||
2342 | return 0; | |
2343 | } | |
2344 | ||
2345 | /* | |
d063d709 | 2346 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2347 | * apps_sock - The communication socket for all UST apps. |
2348 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d DG |
2349 | */ |
2350 | static int init_daemon_socket() | |
2351 | { | |
2352 | int ret = 0; | |
2353 | mode_t old_umask; | |
2354 | ||
2355 | old_umask = umask(0); | |
2356 | ||
2357 | /* Create client tool unix socket */ | |
d6f42150 DG |
2358 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2359 | if (client_sock < 0) { | |
2360 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2361 | ret = -1; |
2362 | goto end; | |
2363 | } | |
2364 | ||
2365 | /* File permission MUST be 660 */ | |
2366 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2367 | if (ret < 0) { | |
d6f42150 | 2368 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2369 | perror("chmod"); |
2370 | goto end; | |
2371 | } | |
2372 | ||
2373 | /* Create the application unix socket */ | |
d6f42150 DG |
2374 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2375 | if (apps_sock < 0) { | |
2376 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2377 | ret = -1; |
2378 | goto end; | |
2379 | } | |
2380 | ||
d6f42150 | 2381 | /* File permission MUST be 666 */ |
fac6795d DG |
2382 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2383 | if (ret < 0) { | |
d6f42150 | 2384 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2385 | perror("chmod"); |
2386 | goto end; | |
2387 | } | |
2388 | ||
2389 | end: | |
2390 | umask(old_umask); | |
2391 | return ret; | |
2392 | } | |
2393 | ||
2394 | /* | |
d063d709 | 2395 | * Check if the global socket is available. If yes, error is returned. |
fac6795d DG |
2396 | */ |
2397 | static int check_existing_daemon() | |
2398 | { | |
2399 | int ret; | |
2400 | ||
2401 | ret = access(client_unix_sock_path, F_OK); | |
2402 | if (ret == 0) { | |
2403 | ret = access(apps_unix_sock_path, F_OK); | |
2404 | } | |
2405 | ||
2406 | return ret; | |
2407 | } | |
2408 | ||
fac6795d | 2409 | /* |
d063d709 | 2410 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2411 | * |
d063d709 DG |
2412 | * Race window between mkdir and chown is OK because we are going from more |
2413 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2414 | */ |
d6f42150 | 2415 | static int set_permissions(void) |
fac6795d DG |
2416 | { |
2417 | int ret; | |
2418 | struct group *grp; | |
2419 | ||
2420 | /* Decide which group name to use */ | |
2421 | (opt_tracing_group != NULL) ? | |
2422 | (grp = getgrnam(opt_tracing_group)) : | |
2423 | (grp = getgrnam(default_tracing_group)); | |
2424 | ||
2425 | if (grp == NULL) { | |
a463f419 DG |
2426 | if (is_root) { |
2427 | WARN("No tracing group detected"); | |
2428 | ret = 0; | |
2429 | } else { | |
2430 | ERR("Missing tracing group. Aborting execution."); | |
2431 | ret = -1; | |
2432 | } | |
fac6795d DG |
2433 | goto end; |
2434 | } | |
2435 | ||
d6f42150 DG |
2436 | /* Set lttng run dir */ |
2437 | ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid); | |
2438 | if (ret < 0) { | |
2439 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2440 | perror("chown"); | |
2441 | } | |
2442 | ||
2443 | /* lttng client socket path */ | |
fac6795d DG |
2444 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); |
2445 | if (ret < 0) { | |
d6f42150 DG |
2446 | ERR("Unable to set group on %s", client_unix_sock_path); |
2447 | perror("chown"); | |
2448 | } | |
2449 | ||
2450 | /* kconsumerd error socket path */ | |
2451 | ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid); | |
2452 | if (ret < 0) { | |
2453 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2454 | perror("chown"); |
2455 | } | |
2456 | ||
d6f42150 | 2457 | DBG("All permissions are set"); |
e07ae692 | 2458 | |
fac6795d DG |
2459 | end: |
2460 | return ret; | |
2461 | } | |
2462 | ||
7a485870 | 2463 | /* |
d063d709 | 2464 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2465 | */ |
2466 | static int create_kernel_poll_pipe(void) | |
2467 | { | |
2468 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2469 | } | |
2470 | ||
d6f42150 | 2471 | /* |
d063d709 | 2472 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2473 | */ |
2474 | static int create_lttng_rundir(void) | |
2475 | { | |
2476 | int ret; | |
2477 | ||
2478 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2479 | if (ret < 0) { | |
b1f11e69 DG |
2480 | if (errno != EEXIST) { |
2481 | ERR("Unable to create " LTTNG_RUNDIR); | |
2482 | goto error; | |
2483 | } else { | |
2484 | ret = 0; | |
2485 | } | |
d6f42150 DG |
2486 | } |
2487 | ||
2488 | error: | |
2489 | return ret; | |
2490 | } | |
2491 | ||
2492 | /* | |
d063d709 DG |
2493 | * Setup sockets and directory needed by the kconsumerd communication with the |
2494 | * session daemon. | |
d6f42150 DG |
2495 | */ |
2496 | static int set_kconsumerd_sockets(void) | |
2497 | { | |
2498 | int ret; | |
2499 | ||
2500 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2501 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2502 | } | |
2503 | ||
2504 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2505 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2506 | } | |
2507 | ||
2508 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2509 | if (ret < 0) { | |
6beb2242 DG |
2510 | if (errno != EEXIST) { |
2511 | ERR("Failed to create " KCONSUMERD_PATH); | |
2512 | goto error; | |
2513 | } | |
2514 | ret = 0; | |
d6f42150 DG |
2515 | } |
2516 | ||
2517 | /* Create the kconsumerd error unix socket */ | |
2518 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
2519 | if (kconsumerd_err_sock < 0) { | |
2520 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
2521 | ret = -1; | |
2522 | goto error; | |
2523 | } | |
2524 | ||
2525 | /* File permission MUST be 660 */ | |
2526 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2527 | if (ret < 0) { | |
2528 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
2529 | perror("chmod"); | |
2530 | goto error; | |
2531 | } | |
2532 | ||
2533 | error: | |
2534 | return ret; | |
2535 | } | |
2536 | ||
fac6795d | 2537 | /* |
d063d709 | 2538 | * Signal handler for the daemon |
fac6795d DG |
2539 | */ |
2540 | static void sighandler(int sig) | |
2541 | { | |
2542 | switch (sig) { | |
2543 | case SIGPIPE: | |
e07ae692 | 2544 | DBG("SIGPIPE catched"); |
87378cf5 | 2545 | return; |
fac6795d | 2546 | case SIGINT: |
e07ae692 DG |
2547 | DBG("SIGINT catched"); |
2548 | cleanup(); | |
2549 | break; | |
fac6795d | 2550 | case SIGTERM: |
e07ae692 | 2551 | DBG("SIGTERM catched"); |
fac6795d | 2552 | cleanup(); |
686204ab | 2553 | break; |
fac6795d DG |
2554 | default: |
2555 | break; | |
2556 | } | |
2557 | ||
2558 | exit(EXIT_SUCCESS); | |
2559 | } | |
2560 | ||
2561 | /* | |
d063d709 | 2562 | * Setup signal handler for : |
1d4b027a | 2563 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 2564 | */ |
1d4b027a | 2565 | static int set_signal_handler(void) |
fac6795d | 2566 | { |
1d4b027a DG |
2567 | int ret = 0; |
2568 | struct sigaction sa; | |
2569 | sigset_t sigset; | |
fac6795d | 2570 | |
1d4b027a DG |
2571 | if ((ret = sigemptyset(&sigset)) < 0) { |
2572 | perror("sigemptyset"); | |
2573 | return ret; | |
2574 | } | |
d6f42150 | 2575 | |
1d4b027a DG |
2576 | sa.sa_handler = sighandler; |
2577 | sa.sa_mask = sigset; | |
2578 | sa.sa_flags = 0; | |
2579 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
2580 | perror("sigaction"); | |
2581 | return ret; | |
d6f42150 DG |
2582 | } |
2583 | ||
1d4b027a DG |
2584 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
2585 | perror("sigaction"); | |
2586 | return ret; | |
d6f42150 | 2587 | } |
aaf26714 | 2588 | |
1d4b027a DG |
2589 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
2590 | perror("sigaction"); | |
2591 | return ret; | |
8c0faa1d DG |
2592 | } |
2593 | ||
1d4b027a DG |
2594 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
2595 | ||
2596 | return ret; | |
fac6795d DG |
2597 | } |
2598 | ||
f3ed775e | 2599 | /* |
d063d709 DG |
2600 | * Set open files limit to unlimited. This daemon can open a large number of |
2601 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
2602 | */ |
2603 | static void set_ulimit(void) | |
2604 | { | |
2605 | int ret; | |
2606 | struct rlimit lim; | |
2607 | ||
a88df331 | 2608 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
2609 | lim.rlim_cur = 65535; |
2610 | lim.rlim_max = 65535; | |
2611 | ||
2612 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
2613 | if (ret < 0) { | |
2614 | perror("failed to set open files limit"); | |
2615 | } | |
2616 | } | |
2617 | ||
fac6795d DG |
2618 | /* |
2619 | * main | |
2620 | */ | |
2621 | int main(int argc, char **argv) | |
2622 | { | |
fac6795d DG |
2623 | int ret = 0; |
2624 | void *status; | |
b082db07 | 2625 | const char *home_path; |
fac6795d | 2626 | |
273ea72c DG |
2627 | /* Create thread quit pipe */ |
2628 | if (init_thread_quit_pipe() < 0) { | |
a88df331 | 2629 | goto exit; |
273ea72c DG |
2630 | } |
2631 | ||
fac6795d DG |
2632 | /* Parse arguments */ |
2633 | progname = argv[0]; | |
2634 | if ((ret = parse_args(argc, argv) < 0)) { | |
a88df331 | 2635 | goto exit; |
fac6795d DG |
2636 | } |
2637 | ||
2638 | /* Daemonize */ | |
2639 | if (opt_daemon) { | |
53094c05 DG |
2640 | ret = daemon(0, 0); |
2641 | if (ret < 0) { | |
2642 | perror("daemon"); | |
a88df331 | 2643 | goto exit; |
53094c05 | 2644 | } |
fac6795d DG |
2645 | } |
2646 | ||
2647 | /* Check if daemon is UID = 0 */ | |
2648 | is_root = !getuid(); | |
2649 | ||
fac6795d | 2650 | if (is_root) { |
d6f42150 DG |
2651 | ret = create_lttng_rundir(); |
2652 | if (ret < 0) { | |
a88df331 | 2653 | goto exit; |
d6f42150 DG |
2654 | } |
2655 | ||
fac6795d | 2656 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
2657 | snprintf(apps_unix_sock_path, PATH_MAX, |
2658 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
2659 | } |
2660 | ||
2661 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
2662 | snprintf(client_unix_sock_path, PATH_MAX, |
2663 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
2664 | } | |
fac6795d | 2665 | } else { |
b082db07 DG |
2666 | home_path = get_home_dir(); |
2667 | if (home_path == NULL) { | |
273ea72c DG |
2668 | /* TODO: Add --socket PATH option */ |
2669 | ERR("Can't get HOME directory for sockets creation."); | |
a88df331 | 2670 | goto exit; |
b082db07 DG |
2671 | } |
2672 | ||
fac6795d | 2673 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 2674 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 2675 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
2676 | } |
2677 | ||
2678 | /* Set the cli tool unix socket path */ | |
2679 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 2680 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 2681 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d DG |
2682 | } |
2683 | } | |
2684 | ||
847177cd DG |
2685 | DBG("Client socket path %s", client_unix_sock_path); |
2686 | DBG("Application socket path %s", apps_unix_sock_path); | |
2687 | ||
273ea72c DG |
2688 | /* |
2689 | * See if daemon already exist. If any of the two socket needed by the | |
2690 | * daemon are present, this test fails. However, if the daemon is killed | |
2691 | * with a SIGKILL, those unix socket must be unlinked by hand. | |
fac6795d DG |
2692 | */ |
2693 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 2694 | ERR("Already running daemon.\n"); |
273ea72c | 2695 | /* |
a88df331 DG |
2696 | * We do not goto error because we must not cleanup() because a daemon |
2697 | * is already running. | |
ab118b20 | 2698 | */ |
a88df331 DG |
2699 | goto exit; |
2700 | } | |
2701 | ||
2702 | /* After this point, we can safely call cleanup() so goto error is used */ | |
2703 | ||
2704 | /* | |
2705 | * These actions must be executed as root. We do that *after* setting up | |
2706 | * the sockets path because we MUST make the check for another daemon using | |
2707 | * those paths *before* trying to set the kernel consumer sockets and init | |
2708 | * kernel tracer. | |
2709 | */ | |
2710 | if (is_root) { | |
2711 | ret = set_kconsumerd_sockets(); | |
2712 | if (ret < 0) { | |
2713 | goto error; | |
2714 | } | |
2715 | ||
2716 | /* Setup kernel tracer */ | |
2717 | init_kernel_tracer(); | |
2718 | ||
2719 | /* Set ulimit for open files */ | |
2720 | set_ulimit(); | |
fac6795d DG |
2721 | } |
2722 | ||
2723 | if (set_signal_handler() < 0) { | |
2724 | goto error; | |
2725 | } | |
2726 | ||
d6f42150 | 2727 | /* Setup the needed unix socket */ |
fac6795d DG |
2728 | if (init_daemon_socket() < 0) { |
2729 | goto error; | |
2730 | } | |
2731 | ||
2732 | /* Set credentials to socket */ | |
d6f42150 | 2733 | if (is_root && (set_permissions() < 0)) { |
fac6795d DG |
2734 | goto error; |
2735 | } | |
2736 | ||
5b8719f5 DG |
2737 | /* Get parent pid if -S, --sig-parent is specified. */ |
2738 | if (opt_sig_parent) { | |
2739 | ppid = getppid(); | |
2740 | } | |
2741 | ||
7a485870 DG |
2742 | /* Setup the kernel pipe for waking up the kernel thread */ |
2743 | if (create_kernel_poll_pipe() < 0) { | |
2744 | goto error; | |
2745 | } | |
2746 | ||
273ea72c DG |
2747 | /* |
2748 | * Get session list pointer. This pointer MUST NOT be free(). | |
2749 | * This list is statically declared in session.c | |
2750 | */ | |
b5541356 DG |
2751 | session_list_ptr = get_session_list(); |
2752 | ||
fac6795d DG |
2753 | while (1) { |
2754 | /* Create thread to manage the client socket */ | |
1d4b027a | 2755 | ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL); |
fac6795d DG |
2756 | if (ret != 0) { |
2757 | perror("pthread_create"); | |
2758 | goto error; | |
2759 | } | |
2760 | ||
2761 | /* Create thread to manage application socket */ | |
1d4b027a | 2762 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); |
fac6795d DG |
2763 | if (ret != 0) { |
2764 | perror("pthread_create"); | |
2765 | goto error; | |
2766 | } | |
2767 | ||
7a485870 DG |
2768 | /* Create kernel thread to manage kernel event */ |
2769 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
2770 | if (ret != 0) { | |
2771 | perror("pthread_create"); | |
2772 | goto error; | |
2773 | } | |
2774 | ||
1d4b027a DG |
2775 | ret = pthread_join(client_thread, &status); |
2776 | if (ret != 0) { | |
2777 | perror("pthread_join"); | |
2778 | goto error; | |
fac6795d DG |
2779 | } |
2780 | } | |
2781 | ||
2782 | cleanup(); | |
5e16da05 | 2783 | exit(EXIT_SUCCESS); |
fac6795d DG |
2784 | |
2785 | error: | |
2786 | cleanup(); | |
a88df331 DG |
2787 | |
2788 | exit: | |
5e16da05 | 2789 | exit(EXIT_FAILURE); |
fac6795d | 2790 | } |