Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
996b65c8 | 3 | * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
7 | * as published by the Free Software Foundation; only version 2 |
8 | * of the License. | |
91d76f53 | 9 | * |
fac6795d DG |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
fac6795d DG |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
7a485870 | 25 | #include <poll.h> |
fac6795d | 26 | #include <pthread.h> |
8c0faa1d | 27 | #include <semaphore.h> |
fac6795d DG |
28 | #include <signal.h> |
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | #include <sys/ipc.h> | |
b73401da | 33 | #include <sys/mount.h> |
fac6795d DG |
34 | #include <sys/shm.h> |
35 | #include <sys/socket.h> | |
36 | #include <sys/stat.h> | |
37 | #include <sys/types.h> | |
f3ed775e DG |
38 | #include <sys/time.h> |
39 | #include <sys/resource.h> | |
fac6795d DG |
40 | #include <unistd.h> |
41 | ||
42 | #include <urcu/list.h> /* URCU list library (-lurcu) */ | |
5b97ec60 | 43 | #include <lttng/lttng.h> |
fac6795d | 44 | |
b579acd9 | 45 | #include "context.h" |
fac6795d DG |
46 | #include "liblttsessiondcomm.h" |
47 | #include "ltt-sessiond.h" | |
75462a81 | 48 | #include "lttngerr.h" |
20fe2104 | 49 | #include "kernel-ctl.h" |
9e78d6ae | 50 | #include "ust-ctl.h" |
5b74c7b1 | 51 | #include "session.h" |
91d76f53 | 52 | #include "traceable-app.h" |
5dc18550 | 53 | #include "lttng-kconsumerd.h" |
8e68d1c8 | 54 | #include "utils.h" |
fac6795d | 55 | |
75462a81 | 56 | /* Const values */ |
686204ab | 57 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 58 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
59 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
60 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
61 | ||
fac6795d | 62 | /* Variables */ |
1d4b027a | 63 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 64 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 65 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 66 | |
fac6795d DG |
67 | const char *progname; |
68 | const char *opt_tracing_group; | |
5b8719f5 | 69 | static int opt_sig_parent; |
fac6795d DG |
70 | static int opt_daemon; |
71 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
72 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
73 | static pid_t kconsumerd_pid; | |
7a485870 | 74 | static struct pollfd *kernel_pollfd; |
fac6795d | 75 | |
d6f42150 DG |
76 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
77 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
78 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
79 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
fac6795d | 80 | |
1d4b027a | 81 | /* Sockets and FDs */ |
d6f42150 DG |
82 | static int client_sock; |
83 | static int apps_sock; | |
84 | static int kconsumerd_err_sock; | |
8c0faa1d | 85 | static int kconsumerd_cmd_sock; |
20fe2104 | 86 | static int kernel_tracer_fd; |
7a485870 | 87 | static int kernel_poll_pipe[2]; |
1d4b027a | 88 | |
273ea72c DG |
89 | /* |
90 | * Quit pipe for all threads. This permits a single cancellation point | |
91 | * for all threads when receiving an event on the pipe. | |
92 | */ | |
93 | static int thread_quit_pipe[2]; | |
94 | ||
1d4b027a | 95 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 96 | static pthread_t kconsumerd_thread; |
1d4b027a DG |
97 | static pthread_t apps_thread; |
98 | static pthread_t client_thread; | |
7a485870 | 99 | static pthread_t kernel_thread; |
8c0faa1d DG |
100 | static sem_t kconsumerd_sem; |
101 | ||
1d4b027a | 102 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
fac6795d | 103 | |
ab147185 MD |
104 | static int modprobe_remove_kernel_modules(void); |
105 | ||
b5541356 DG |
106 | /* |
107 | * Pointer initialized before thread creation. | |
108 | * | |
109 | * This points to the tracing session list containing the session count and a | |
110 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
111 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 112 | * |
d063d709 DG |
113 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
114 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
115 | */ |
116 | static struct ltt_session_list *session_list_ptr; | |
117 | ||
996b65c8 MD |
118 | static gid_t allowed_group(void) |
119 | { | |
120 | struct group *grp; | |
121 | ||
274e143b MD |
122 | if (opt_tracing_group) { |
123 | grp = getgrnam(opt_tracing_group); | |
124 | } else { | |
125 | grp = getgrnam(default_tracing_group); | |
126 | } | |
996b65c8 MD |
127 | if (!grp) { |
128 | return -1; | |
129 | } else { | |
130 | return grp->gr_gid; | |
131 | } | |
132 | } | |
133 | ||
273ea72c DG |
134 | /* |
135 | * Init quit pipe. | |
136 | * | |
137 | * Return -1 on error or 0 if all pipes are created. | |
138 | */ | |
139 | static int init_thread_quit_pipe(void) | |
140 | { | |
141 | int ret; | |
142 | ||
143 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
144 | if (ret < 0) { | |
145 | perror("thread quit pipe"); | |
146 | goto error; | |
147 | } | |
148 | ||
149 | error: | |
150 | return ret; | |
151 | } | |
152 | ||
fac6795d | 153 | /* |
d063d709 DG |
154 | * Complete teardown of a kernel session. This free all data structure related |
155 | * to a kernel session and update counter. | |
fac6795d | 156 | */ |
1d4b027a | 157 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 158 | { |
1d4b027a DG |
159 | if (session->kernel_session != NULL) { |
160 | DBG("Tearing down kernel session"); | |
c363b55d | 161 | trace_destroy_kernel_session(session->kernel_session); |
1d4b027a DG |
162 | /* Extra precaution */ |
163 | session->kernel_session = NULL; | |
fac6795d | 164 | } |
fac6795d DG |
165 | } |
166 | ||
cf3af59e MD |
167 | static void stop_threads(void) |
168 | { | |
169 | /* Stopping all threads */ | |
170 | DBG("Terminating all threads"); | |
171 | close(thread_quit_pipe[0]); | |
172 | close(thread_quit_pipe[1]); | |
173 | } | |
174 | ||
fac6795d | 175 | /* |
d063d709 | 176 | * Cleanup the daemon |
fac6795d | 177 | */ |
cf3af59e | 178 | static void cleanup(void) |
fac6795d | 179 | { |
1d4b027a DG |
180 | int ret; |
181 | char *cmd; | |
af9737e9 | 182 | struct ltt_session *sess, *stmp; |
fac6795d | 183 | |
1d4b027a | 184 | DBG("Cleaning up"); |
e07ae692 | 185 | |
1d4b027a | 186 | /* <fun> */ |
273ea72c DG |
187 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
188 | "Matthew, BEET driven development works!%c[%dm", | |
189 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 190 | /* </fun> */ |
fac6795d | 191 | |
1d4b027a DG |
192 | DBG("Removing %s directory", LTTNG_RUNDIR); |
193 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
194 | if (ret < 0) { | |
195 | ERR("asprintf failed. Something is really wrong!"); | |
196 | } | |
5461b305 | 197 | |
1d4b027a DG |
198 | /* Remove lttng run directory */ |
199 | ret = system(cmd); | |
200 | if (ret < 0) { | |
201 | ERR("Unable to clean " LTTNG_RUNDIR); | |
202 | } | |
5461b305 | 203 | |
1d4b027a | 204 | DBG("Cleaning up all session"); |
fac6795d | 205 | |
b5541356 | 206 | /* Destroy session list mutex */ |
273ea72c DG |
207 | if (session_list_ptr != NULL) { |
208 | pthread_mutex_destroy(&session_list_ptr->lock); | |
209 | ||
210 | /* Cleanup ALL session */ | |
af9737e9 | 211 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
273ea72c DG |
212 | teardown_kernel_session(sess); |
213 | // TODO complete session cleanup (including UST) | |
214 | } | |
215 | } | |
216 | ||
217 | pthread_mutex_destroy(&kconsumerd_pid_mutex); | |
b5541356 | 218 | |
f3ed775e | 219 | DBG("Closing kernel fd"); |
1d4b027a | 220 | close(kernel_tracer_fd); |
ab147185 MD |
221 | |
222 | DBG("Unloading kernel modules"); | |
223 | modprobe_remove_kernel_modules(); | |
fac6795d DG |
224 | } |
225 | ||
e065084a | 226 | /* |
d063d709 | 227 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 228 | * |
d063d709 | 229 | * Return lttcomm error code. |
e065084a DG |
230 | */ |
231 | static int send_unix_sock(int sock, void *buf, size_t len) | |
232 | { | |
233 | /* Check valid length */ | |
234 | if (len <= 0) { | |
235 | return -1; | |
236 | } | |
237 | ||
238 | return lttcomm_send_unix_sock(sock, buf, len); | |
239 | } | |
240 | ||
5461b305 | 241 | /* |
d063d709 | 242 | * Free memory of a command context structure. |
5461b305 | 243 | */ |
a2fb29a5 | 244 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 245 | { |
a2fb29a5 DG |
246 | DBG("Clean command context structure"); |
247 | if (*cmd_ctx) { | |
248 | if ((*cmd_ctx)->llm) { | |
249 | free((*cmd_ctx)->llm); | |
5461b305 | 250 | } |
a2fb29a5 DG |
251 | if ((*cmd_ctx)->lsm) { |
252 | free((*cmd_ctx)->lsm); | |
5461b305 | 253 | } |
a2fb29a5 DG |
254 | free(*cmd_ctx); |
255 | *cmd_ctx = NULL; | |
5461b305 DG |
256 | } |
257 | } | |
258 | ||
f3ed775e | 259 | /* |
d063d709 | 260 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 261 | */ |
7a485870 | 262 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
263 | { |
264 | int ret; | |
265 | size_t nb_fd; | |
266 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
267 | struct lttcomm_kconsumerd_header lkh; |
268 | struct lttcomm_kconsumerd_msg lkm; | |
269 | ||
7a485870 DG |
270 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
271 | ||
272 | nb_fd = channel->stream_count; | |
f3ed775e DG |
273 | |
274 | /* Setup header */ | |
7a485870 | 275 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
276 | lkh.cmd_type = ADD_STREAM; |
277 | ||
278 | DBG("Sending kconsumerd header"); | |
279 | ||
280 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
281 | if (ret < 0) { | |
282 | perror("send kconsumerd header"); | |
283 | goto error; | |
284 | } | |
285 | ||
7a485870 DG |
286 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
287 | if (stream->fd != 0) { | |
f3ed775e DG |
288 | lkm.fd = stream->fd; |
289 | lkm.state = stream->state; | |
7a485870 | 290 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
f3ed775e DG |
291 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
292 | ||
293 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
294 | ||
295 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
296 | if (ret < 0) { | |
297 | perror("send kconsumerd fd"); | |
298 | goto error; | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
7a485870 | 303 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
304 | |
305 | return 0; | |
306 | ||
307 | error: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | /* | |
d063d709 | 312 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 313 | */ |
7a485870 | 314 | static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session) |
f3ed775e DG |
315 | { |
316 | int ret; | |
317 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
318 | struct lttcomm_kconsumerd_header lkh; |
319 | struct lttcomm_kconsumerd_msg lkm; | |
320 | ||
321 | /* Setup header */ | |
322 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
323 | lkh.cmd_type = ADD_STREAM; | |
324 | ||
325 | DBG("Sending kconsumerd header for metadata"); | |
326 | ||
327 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
328 | if (ret < 0) { | |
329 | perror("send kconsumerd header"); | |
330 | goto error; | |
331 | } | |
332 | ||
333 | DBG("Sending metadata stream fd"); | |
334 | ||
335 | if (session->metadata_stream_fd != 0) { | |
336 | /* Send metadata stream fd first */ | |
337 | lkm.fd = session->metadata_stream_fd; | |
338 | lkm.state = ACTIVE_FD; | |
339 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
340 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); | |
341 | ||
342 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
343 | if (ret < 0) { | |
344 | perror("send kconsumerd fd"); | |
345 | goto error; | |
346 | } | |
347 | } | |
f3ed775e | 348 | |
f3ed775e | 349 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
7a485870 | 350 | ret = send_kconsumerd_channel_fds(sock, chan); |
f3ed775e | 351 | if (ret < 0) { |
7a485870 | 352 | goto error; |
f3ed775e DG |
353 | } |
354 | } | |
355 | ||
7a485870 DG |
356 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
357 | ||
f3ed775e DG |
358 | return 0; |
359 | ||
360 | error: | |
361 | return ret; | |
362 | } | |
363 | ||
97b1a726 | 364 | #ifdef DISABLED |
fac6795d | 365 | /* |
d063d709 DG |
366 | * Return a socket connected to the libust communication socket of the |
367 | * application identified by the pid. | |
fac6795d | 368 | * |
d063d709 | 369 | * If the pid is not found in the traceable list, return -1 to indicate error. |
fac6795d | 370 | */ |
471d1693 | 371 | static int ust_connect_app(pid_t pid) |
fac6795d | 372 | { |
91d76f53 DG |
373 | int sock; |
374 | struct ltt_traceable_app *lta; | |
379473d2 | 375 | |
e07ae692 DG |
376 | DBG("Connect to application pid %d", pid); |
377 | ||
91d76f53 DG |
378 | lta = find_app_by_pid(pid); |
379 | if (lta == NULL) { | |
380 | /* App not found */ | |
7442b2ba | 381 | DBG("Application pid %d not found", pid); |
379473d2 DG |
382 | return -1; |
383 | } | |
fac6795d | 384 | |
91d76f53 | 385 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 386 | if (sock < 0) { |
62d3069f | 387 | ERR("Fail connecting to the PID %d", pid); |
fac6795d DG |
388 | } |
389 | ||
390 | return sock; | |
391 | } | |
97b1a726 | 392 | #endif /* DISABLED */ |
fac6795d DG |
393 | |
394 | /* | |
d063d709 DG |
395 | * Notify apps by writing 42 to a named pipe using name. Every applications |
396 | * waiting for a ltt-sessiond will be notified and re-register automatically to | |
397 | * the session daemon. | |
fac6795d | 398 | * |
d063d709 | 399 | * Return open or write error value. |
fac6795d DG |
400 | */ |
401 | static int notify_apps(const char *name) | |
402 | { | |
403 | int fd; | |
404 | int ret = -1; | |
405 | ||
e07ae692 DG |
406 | DBG("Notify the global application pipe"); |
407 | ||
fac6795d DG |
408 | /* Try opening the global pipe */ |
409 | fd = open(name, O_WRONLY); | |
410 | if (fd < 0) { | |
411 | goto error; | |
412 | } | |
413 | ||
414 | /* Notify by writing on the pipe */ | |
415 | ret = write(fd, "42", 2); | |
416 | if (ret < 0) { | |
417 | perror("write"); | |
418 | } | |
419 | ||
420 | error: | |
421 | return ret; | |
422 | } | |
423 | ||
e065084a | 424 | /* |
d063d709 DG |
425 | * Setup the outgoing data buffer for the response (llm) by allocating the |
426 | * right amount of memory and copying the original information from the lsm | |
427 | * structure. | |
ca95a216 | 428 | * |
d063d709 | 429 | * Return total size of the buffer pointed by buf. |
ca95a216 | 430 | */ |
5461b305 | 431 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 432 | { |
f3ed775e | 433 | int ret, buf_size; |
ca95a216 | 434 | |
f3ed775e | 435 | buf_size = size; |
5461b305 DG |
436 | |
437 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
438 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 439 | perror("malloc"); |
5461b305 | 440 | ret = -ENOMEM; |
ca95a216 DG |
441 | goto error; |
442 | } | |
443 | ||
5461b305 DG |
444 | /* Copy common data */ |
445 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 446 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 447 | |
5461b305 DG |
448 | cmd_ctx->llm->data_size = size; |
449 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
450 | ||
ca95a216 DG |
451 | return buf_size; |
452 | ||
453 | error: | |
454 | return ret; | |
455 | } | |
456 | ||
7a485870 | 457 | /* |
d063d709 DG |
458 | * Update the kernel pollfd set of all channel fd available over all tracing |
459 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
460 | */ |
461 | static int update_kernel_pollfd(void) | |
462 | { | |
463 | int i = 0; | |
273ea72c DG |
464 | /* |
465 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
466 | * at 2 for those pipes. | |
467 | */ | |
468 | unsigned int nb_fd = 2; | |
7a485870 DG |
469 | struct ltt_session *session; |
470 | struct ltt_kernel_channel *channel; | |
471 | ||
472 | DBG("Updating kernel_pollfd"); | |
473 | ||
474 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 475 | lock_session_list(); |
b5541356 DG |
476 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
477 | lock_session(session); | |
7a485870 | 478 | if (session->kernel_session == NULL) { |
b5541356 | 479 | unlock_session(session); |
7a485870 DG |
480 | continue; |
481 | } | |
482 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 483 | unlock_session(session); |
7a485870 DG |
484 | } |
485 | ||
486 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
487 | ||
488 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
489 | if (kernel_pollfd == NULL) { | |
490 | perror("malloc kernel_pollfd"); | |
491 | goto error; | |
492 | } | |
493 | ||
b5541356 DG |
494 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
495 | lock_session(session); | |
7a485870 | 496 | if (session->kernel_session == NULL) { |
b5541356 | 497 | unlock_session(session); |
7a485870 DG |
498 | continue; |
499 | } | |
500 | if (i >= nb_fd) { | |
501 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 502 | unlock_session(session); |
7a485870 DG |
503 | break; |
504 | } | |
505 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
506 | kernel_pollfd[i].fd = channel->fd; | |
507 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
508 | i++; | |
509 | } | |
b5541356 | 510 | unlock_session(session); |
7a485870 | 511 | } |
6c9cc2ab | 512 | unlock_session_list(); |
7a485870 DG |
513 | |
514 | /* Adding wake up pipe */ | |
273ea72c DG |
515 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
516 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
517 | ||
518 | /* Adding the quit pipe */ | |
519 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
520 | |
521 | return nb_fd; | |
522 | ||
523 | error: | |
6c9cc2ab | 524 | unlock_session_list(); |
7a485870 DG |
525 | return -1; |
526 | } | |
527 | ||
528 | /* | |
d063d709 DG |
529 | * Find the channel fd from 'fd' over all tracing session. When found, check |
530 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 531 | * |
d063d709 | 532 | * Useful for CPU hotplug feature. |
7a485870 DG |
533 | */ |
534 | static int update_kernel_stream(int fd) | |
535 | { | |
536 | int ret = 0; | |
537 | struct ltt_session *session; | |
538 | struct ltt_kernel_channel *channel; | |
539 | ||
540 | DBG("Updating kernel streams for channel fd %d", fd); | |
541 | ||
6c9cc2ab | 542 | lock_session_list(); |
b5541356 DG |
543 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
544 | lock_session(session); | |
7a485870 | 545 | if (session->kernel_session == NULL) { |
b5541356 | 546 | unlock_session(session); |
7a485870 DG |
547 | continue; |
548 | } | |
549 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
550 | if (channel->fd == fd) { | |
551 | DBG("Channel found, updating kernel streams"); | |
552 | ret = kernel_open_channel_stream(channel); | |
553 | if (ret < 0) { | |
554 | goto end; | |
555 | } | |
556 | /* | |
557 | * Have we already sent fds to the consumer? If yes, it means that | |
558 | * tracing is started so it is safe to send our updated stream fds. | |
559 | */ | |
560 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
561 | ret = send_kconsumerd_channel_fds(kconsumerd_cmd_sock, channel); | |
562 | if (ret < 0) { | |
563 | goto end; | |
564 | } | |
565 | } | |
566 | goto end; | |
567 | } | |
568 | } | |
b5541356 | 569 | unlock_session(session); |
7a485870 DG |
570 | } |
571 | ||
572 | end: | |
6c9cc2ab | 573 | unlock_session_list(); |
b5541356 DG |
574 | if (session) { |
575 | unlock_session(session); | |
576 | } | |
7a485870 DG |
577 | return ret; |
578 | } | |
579 | ||
580 | /* | |
d063d709 | 581 | * This thread manage event coming from the kernel. |
7a485870 | 582 | * |
d063d709 DG |
583 | * Features supported in this thread: |
584 | * -) CPU Hotplug | |
7a485870 DG |
585 | */ |
586 | static void *thread_manage_kernel(void *data) | |
587 | { | |
588 | int ret, i, nb_fd = 0; | |
589 | char tmp; | |
590 | int update_poll_flag = 1; | |
591 | ||
592 | DBG("Thread manage kernel started"); | |
593 | ||
594 | while (1) { | |
595 | if (update_poll_flag == 1) { | |
596 | nb_fd = update_kernel_pollfd(); | |
597 | if (nb_fd < 0) { | |
598 | goto error; | |
599 | } | |
600 | update_poll_flag = 0; | |
601 | } | |
602 | ||
603 | DBG("Polling on %d fds", nb_fd); | |
604 | ||
605 | /* Poll infinite value of time */ | |
606 | ret = poll(kernel_pollfd, nb_fd, -1); | |
607 | if (ret < 0) { | |
608 | perror("poll kernel thread"); | |
609 | goto error; | |
610 | } else if (ret == 0) { | |
611 | /* Should not happen since timeout is infinite */ | |
612 | continue; | |
613 | } | |
614 | ||
273ea72c DG |
615 | /* Thread quit pipe has been closed. Killing thread. */ |
616 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
617 | goto error; | |
618 | } | |
619 | ||
7a485870 DG |
620 | DBG("Kernel poll event triggered"); |
621 | ||
622 | /* | |
623 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
624 | * must be updated. | |
625 | */ | |
273ea72c | 626 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 627 | case POLLIN: |
7a485870 DG |
628 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
629 | update_poll_flag = 1; | |
630 | continue; | |
b5541356 DG |
631 | case POLLERR: |
632 | goto error; | |
633 | default: | |
634 | break; | |
7a485870 DG |
635 | } |
636 | ||
637 | for (i = 0; i < nb_fd; i++) { | |
638 | switch (kernel_pollfd[i].revents) { | |
639 | /* | |
640 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
641 | * session and updating the kernel consumer | |
642 | */ | |
643 | case POLLIN | POLLRDNORM: | |
644 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
645 | if (ret < 0) { | |
646 | continue; | |
647 | } | |
648 | break; | |
649 | } | |
650 | } | |
651 | } | |
652 | ||
653 | error: | |
654 | DBG("Kernel thread dying"); | |
655 | if (kernel_pollfd) { | |
656 | free(kernel_pollfd); | |
657 | } | |
273ea72c DG |
658 | |
659 | close(kernel_poll_pipe[0]); | |
660 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
661 | return NULL; |
662 | } | |
663 | ||
1d4b027a | 664 | /* |
d063d709 | 665 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
666 | */ |
667 | static void *thread_manage_kconsumerd(void *data) | |
668 | { | |
273ea72c | 669 | int sock = 0, ret; |
1d4b027a | 670 | enum lttcomm_return_code code; |
273ea72c | 671 | struct pollfd pollfd[2]; |
1d4b027a DG |
672 | |
673 | DBG("[thread] Manage kconsumerd started"); | |
674 | ||
675 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
676 | if (ret < 0) { | |
677 | goto error; | |
678 | } | |
679 | ||
273ea72c DG |
680 | /* First fd is always the quit pipe */ |
681 | pollfd[0].fd = thread_quit_pipe[0]; | |
682 | ||
683 | /* Apps socket */ | |
684 | pollfd[1].fd = kconsumerd_err_sock; | |
685 | pollfd[1].events = POLLIN; | |
686 | ||
687 | /* Inifinite blocking call, waiting for transmission */ | |
688 | ret = poll(pollfd, 2, -1); | |
689 | if (ret < 0) { | |
690 | perror("poll kconsumerd thread"); | |
691 | goto error; | |
692 | } | |
693 | ||
694 | /* Thread quit pipe has been closed. Killing thread. */ | |
695 | if (pollfd[0].revents == POLLNVAL) { | |
696 | goto error; | |
697 | } else if (pollfd[1].revents == POLLERR) { | |
698 | ERR("Kconsumerd err socket poll error"); | |
699 | goto error; | |
700 | } | |
701 | ||
1d4b027a DG |
702 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
703 | if (sock < 0) { | |
704 | goto error; | |
705 | } | |
706 | ||
712ea556 | 707 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
708 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
709 | if (ret <= 0) { | |
710 | goto error; | |
711 | } | |
712 | ||
713 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
714 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
715 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 716 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
717 | perror("kconsumerd connect"); |
718 | goto error; | |
719 | } | |
720 | /* Signal condition to tell that the kconsumerd is ready */ | |
721 | sem_post(&kconsumerd_sem); | |
722 | DBG("Kconsumerd command socket ready"); | |
723 | } else { | |
6f61d021 | 724 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
725 | lttcomm_get_readable_code(-code)); |
726 | goto error; | |
727 | } | |
728 | ||
712ea556 DG |
729 | /* Wait for any kconsumerd error */ |
730 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
731 | if (ret <= 0) { | |
732 | ERR("Kconsumerd closed the command socket"); | |
733 | goto error; | |
6f61d021 | 734 | } |
1d4b027a | 735 | |
712ea556 DG |
736 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
737 | ||
1d4b027a | 738 | error: |
6f61d021 | 739 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
740 | if (kconsumerd_err_sock) { |
741 | close(kconsumerd_err_sock); | |
742 | } | |
743 | if (kconsumerd_cmd_sock) { | |
744 | close(kconsumerd_cmd_sock); | |
745 | } | |
746 | if (sock) { | |
747 | close(sock); | |
748 | } | |
749 | ||
750 | unlink(kconsumerd_err_unix_sock_path); | |
751 | unlink(kconsumerd_cmd_unix_sock_path); | |
752 | ||
753 | kconsumerd_pid = 0; | |
1d4b027a DG |
754 | return NULL; |
755 | } | |
756 | ||
757 | /* | |
1d4b027a DG |
758 | * This thread manage the application socket communication |
759 | */ | |
760 | static void *thread_manage_apps(void *data) | |
761 | { | |
273ea72c DG |
762 | int sock = 0, ret; |
763 | struct pollfd pollfd[2]; | |
1d4b027a DG |
764 | |
765 | /* TODO: Something more elegant is needed but fine for now */ | |
766 | /* FIXME: change all types to either uint8_t, uint32_t, uint64_t | |
767 | * for 32-bit vs 64-bit compat processes. */ | |
768 | /* replicate in ust with version number */ | |
769 | struct { | |
770 | int reg; /* 1:register, 0:unregister */ | |
771 | pid_t pid; | |
772 | uid_t uid; | |
773 | } reg_msg; | |
774 | ||
775 | DBG("[thread] Manage apps started"); | |
776 | ||
777 | ret = lttcomm_listen_unix_sock(apps_sock); | |
778 | if (ret < 0) { | |
779 | goto error; | |
780 | } | |
781 | ||
273ea72c DG |
782 | /* First fd is always the quit pipe */ |
783 | pollfd[0].fd = thread_quit_pipe[0]; | |
784 | ||
785 | /* Apps socket */ | |
786 | pollfd[1].fd = apps_sock; | |
787 | pollfd[1].events = POLLIN; | |
788 | ||
1d4b027a DG |
789 | /* Notify all applications to register */ |
790 | notify_apps(default_global_apps_pipe); | |
791 | ||
792 | while (1) { | |
793 | DBG("Accepting application registration"); | |
273ea72c DG |
794 | |
795 | /* Inifinite blocking call, waiting for transmission */ | |
796 | ret = poll(pollfd, 2, -1); | |
797 | if (ret < 0) { | |
798 | perror("poll apps thread"); | |
799 | goto error; | |
800 | } | |
801 | ||
802 | /* Thread quit pipe has been closed. Killing thread. */ | |
803 | if (pollfd[0].revents == POLLNVAL) { | |
804 | goto error; | |
805 | } else if (pollfd[1].revents == POLLERR) { | |
806 | ERR("Apps socket poll error"); | |
807 | goto error; | |
808 | } | |
809 | ||
1d4b027a DG |
810 | sock = lttcomm_accept_unix_sock(apps_sock); |
811 | if (sock < 0) { | |
812 | goto error; | |
813 | } | |
814 | ||
273ea72c DG |
815 | /* |
816 | * Basic recv here to handle the very simple data | |
1d4b027a DG |
817 | * that the libust send to register (reg_msg). |
818 | */ | |
819 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
820 | if (ret < 0) { | |
821 | perror("recv"); | |
822 | continue; | |
823 | } | |
824 | ||
825 | /* Add application to the global traceable list */ | |
826 | if (reg_msg.reg == 1) { | |
827 | /* Registering */ | |
828 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); | |
829 | if (ret < 0) { | |
830 | /* register_traceable_app only return an error with | |
831 | * ENOMEM. At this point, we better stop everything. | |
832 | */ | |
833 | goto error; | |
834 | } | |
835 | } else { | |
836 | /* Unregistering */ | |
837 | unregister_traceable_app(reg_msg.pid); | |
838 | } | |
839 | } | |
840 | ||
841 | error: | |
273ea72c DG |
842 | DBG("Apps thread dying"); |
843 | if (apps_sock) { | |
844 | close(apps_sock); | |
845 | } | |
846 | if (sock) { | |
847 | close(sock); | |
848 | } | |
1d4b027a | 849 | |
273ea72c | 850 | unlink(apps_unix_sock_path); |
1d4b027a DG |
851 | return NULL; |
852 | } | |
853 | ||
8c0faa1d | 854 | /* |
d063d709 DG |
855 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
856 | * exec or it will fails. | |
8c0faa1d | 857 | */ |
693bd40b | 858 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
859 | { |
860 | int ret; | |
861 | ||
862 | /* Setup semaphore */ | |
863 | sem_init(&kconsumerd_sem, 0, 0); | |
864 | ||
1d4b027a | 865 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
866 | if (ret != 0) { |
867 | perror("pthread_create kconsumerd"); | |
868 | goto error; | |
869 | } | |
870 | ||
693bd40b | 871 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
872 | sem_wait(&kconsumerd_sem); |
873 | ||
712ea556 DG |
874 | if (kconsumerd_pid == 0) { |
875 | ERR("Kconsumerd did not start"); | |
876 | goto error; | |
877 | } | |
878 | ||
8c0faa1d DG |
879 | return 0; |
880 | ||
881 | error: | |
712ea556 | 882 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
883 | return ret; |
884 | } | |
885 | ||
cf3af59e MD |
886 | static int join_kconsumerd_thread(void) |
887 | { | |
888 | void *status; | |
889 | int ret; | |
890 | ||
891 | if (kconsumerd_pid != 0) { | |
892 | ret = kill(kconsumerd_pid, SIGTERM); | |
893 | if (ret) { | |
894 | ERR("Error killing kconsumerd"); | |
895 | return ret; | |
896 | } | |
897 | return pthread_join(kconsumerd_thread, &status); | |
898 | } else { | |
899 | return 0; | |
900 | } | |
901 | } | |
902 | ||
8c0faa1d | 903 | /* |
d063d709 | 904 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 905 | * |
d063d709 | 906 | * Return pid if successful else -1. |
8c0faa1d | 907 | */ |
693bd40b | 908 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
909 | { |
910 | int ret; | |
911 | pid_t pid; | |
53086306 | 912 | const char *verbosity; |
8c0faa1d | 913 | |
c49dc785 DG |
914 | DBG("Spawning kconsumerd"); |
915 | ||
8c0faa1d DG |
916 | pid = fork(); |
917 | if (pid == 0) { | |
918 | /* | |
919 | * Exec kconsumerd. | |
920 | */ | |
31f73cc9 | 921 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
922 | verbosity = "--verbose"; |
923 | } else { | |
924 | verbosity = "--quiet"; | |
925 | } | |
926 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
927 | if (errno != 0) { |
928 | perror("kernel start consumer exec"); | |
929 | } | |
930 | exit(EXIT_FAILURE); | |
931 | } else if (pid > 0) { | |
932 | ret = pid; | |
933 | goto error; | |
934 | } else { | |
935 | perror("kernel start consumer fork"); | |
936 | ret = -errno; | |
937 | goto error; | |
938 | } | |
939 | ||
940 | error: | |
941 | return ret; | |
942 | } | |
943 | ||
693bd40b | 944 | /* |
d063d709 | 945 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
946 | */ |
947 | static int start_kconsumerd(void) | |
948 | { | |
949 | int ret; | |
950 | ||
693bd40b | 951 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 952 | if (kconsumerd_pid != 0) { |
817153bb | 953 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
954 | goto end; |
955 | } | |
693bd40b | 956 | |
c49dc785 DG |
957 | ret = spawn_kconsumerd(); |
958 | if (ret < 0) { | |
959 | ERR("Spawning kconsumerd failed"); | |
960 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
961 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
962 | goto error; | |
693bd40b | 963 | } |
c49dc785 DG |
964 | |
965 | /* Setting up the global kconsumerd_pid */ | |
966 | kconsumerd_pid = ret; | |
693bd40b DG |
967 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
968 | ||
6f61d021 DG |
969 | DBG("Kconsumerd pid %d", ret); |
970 | ||
693bd40b | 971 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
972 | ret = spawn_kconsumerd_thread(); |
973 | if (ret < 0) { | |
974 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
975 | goto error; |
976 | } | |
977 | ||
c49dc785 | 978 | end: |
693bd40b DG |
979 | return 0; |
980 | ||
981 | error: | |
982 | return ret; | |
983 | } | |
984 | ||
b73401da | 985 | /* |
d063d709 | 986 | * modprobe_kernel_modules |
b73401da DG |
987 | */ |
988 | static int modprobe_kernel_modules(void) | |
989 | { | |
ab147185 | 990 | int ret = 0, i; |
b73401da DG |
991 | char modprobe[256]; |
992 | ||
ab147185 MD |
993 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
994 | ret = snprintf(modprobe, sizeof(modprobe), | |
995 | "/sbin/modprobe %s%s", | |
996 | kernel_modules_list[i].required ? "" : "--quiet ", | |
997 | kernel_modules_list[i].name); | |
b73401da DG |
998 | if (ret < 0) { |
999 | perror("snprintf modprobe"); | |
1000 | goto error; | |
1001 | } | |
ab147185 | 1002 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1003 | ret = system(modprobe); |
ab147185 MD |
1004 | if (ret == -1) { |
1005 | ERR("Unable to launch modprobe for module %s", | |
1006 | kernel_modules_list[i].name); | |
1007 | } else if (kernel_modules_list[i].required | |
1008 | && WEXITSTATUS(ret) != 0) { | |
1009 | ERR("Unable to load module %s", | |
1010 | kernel_modules_list[i].name); | |
1011 | } else { | |
1012 | DBG("Modprobe successfully %s", | |
1013 | kernel_modules_list[i].name); | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | error: | |
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * modprobe_remove_kernel_modules | |
1023 | * Remove modules in reverse load order. | |
1024 | */ | |
1025 | static int modprobe_remove_kernel_modules(void) | |
1026 | { | |
1027 | int ret = 0, i; | |
1028 | char modprobe[256]; | |
1029 | ||
1030 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
1031 | ret = snprintf(modprobe, sizeof(modprobe), | |
1032 | "/sbin/modprobe --remove --quiet %s", | |
1033 | kernel_modules_list[i].name); | |
b73401da | 1034 | if (ret < 0) { |
ab147185 MD |
1035 | perror("snprintf modprobe --remove"); |
1036 | goto error; | |
1037 | } | |
1038 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
1039 | ret = system(modprobe); | |
1040 | if (ret == -1) { | |
1041 | ERR("Unable to launch modprobe --remove for module %s", | |
1042 | kernel_modules_list[i].name); | |
1043 | } else if (kernel_modules_list[i].required | |
1044 | && WEXITSTATUS(ret) != 0) { | |
1045 | ERR("Unable to remove module %s", | |
1046 | kernel_modules_list[i].name); | |
1047 | } else { | |
1048 | DBG("Modprobe removal successful %s", | |
1049 | kernel_modules_list[i].name); | |
b73401da | 1050 | } |
b73401da DG |
1051 | } |
1052 | ||
1053 | error: | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | /* | |
d063d709 | 1058 | * mount_debugfs |
b73401da DG |
1059 | */ |
1060 | static int mount_debugfs(char *path) | |
1061 | { | |
1062 | int ret; | |
1063 | char *type = "debugfs"; | |
1064 | ||
996b65c8 | 1065 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1066 | if (ret < 0) { |
1067 | goto error; | |
1068 | } | |
1069 | ||
1070 | ret = mount(type, path, type, 0, NULL); | |
1071 | if (ret < 0) { | |
1072 | perror("mount debugfs"); | |
1073 | goto error; | |
1074 | } | |
1075 | ||
1076 | DBG("Mounted debugfs successfully at %s", path); | |
1077 | ||
1078 | error: | |
1079 | return ret; | |
1080 | } | |
1081 | ||
8c0faa1d | 1082 | /* |
d063d709 | 1083 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1084 | */ |
f3ed775e | 1085 | static void init_kernel_tracer(void) |
8c0faa1d | 1086 | { |
b73401da DG |
1087 | int ret; |
1088 | char *proc_mounts = "/proc/mounts"; | |
1089 | char line[256]; | |
1090 | char *debugfs_path = NULL, *lttng_path; | |
1091 | FILE *fp; | |
1092 | ||
1093 | /* Detect debugfs */ | |
1094 | fp = fopen(proc_mounts, "r"); | |
1095 | if (fp == NULL) { | |
1096 | ERR("Unable to probe %s", proc_mounts); | |
1097 | goto error; | |
1098 | } | |
1099 | ||
1100 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1101 | if (strstr(line, "debugfs") != NULL) { | |
1102 | /* Remove first string */ | |
1103 | strtok(line, " "); | |
1104 | /* Dup string here so we can reuse line later on */ | |
1105 | debugfs_path = strdup(strtok(NULL, " ")); | |
1106 | DBG("Got debugfs path : %s", debugfs_path); | |
1107 | break; | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | fclose(fp); | |
1112 | ||
1113 | /* Mount debugfs if needded */ | |
1114 | if (debugfs_path == NULL) { | |
1115 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1116 | if (ret < 0) { | |
1117 | perror("asprintf debugfs path"); | |
1118 | goto error; | |
1119 | } | |
1120 | ret = mount_debugfs(debugfs_path); | |
1121 | if (ret < 0) { | |
1122 | goto error; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | /* Modprobe lttng kernel modules */ | |
1127 | ret = modprobe_kernel_modules(); | |
1128 | if (ret < 0) { | |
1129 | goto error; | |
1130 | } | |
1131 | ||
1132 | /* Setup lttng kernel path */ | |
1133 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1134 | if (ret < 0) { | |
1135 | perror("asprintf lttng path"); | |
1136 | goto error; | |
1137 | } | |
1138 | ||
1139 | /* Open debugfs lttng */ | |
1140 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1141 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1142 | DBG("Failed to open %s", lttng_path); |
1143 | goto error; | |
8c0faa1d DG |
1144 | } |
1145 | ||
b73401da DG |
1146 | free(lttng_path); |
1147 | free(debugfs_path); | |
f3ed775e | 1148 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1149 | return; |
1150 | ||
1151 | error: | |
1152 | if (lttng_path) { | |
1153 | free(lttng_path); | |
1154 | } | |
1155 | if (debugfs_path) { | |
1156 | free(debugfs_path); | |
1157 | } | |
1158 | WARN("No kernel tracer available"); | |
1159 | kernel_tracer_fd = 0; | |
1160 | return; | |
f3ed775e | 1161 | } |
33a2b854 | 1162 | |
f3ed775e | 1163 | /* |
d063d709 DG |
1164 | * Start tracing by creating trace directory and sending FDs to the kernel |
1165 | * consumer. | |
f3ed775e DG |
1166 | */ |
1167 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1168 | { | |
f40799e8 | 1169 | int ret = 0; |
8c0faa1d | 1170 | |
f3ed775e DG |
1171 | if (session->kconsumer_fds_sent == 0) { |
1172 | ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session); | |
1173 | if (ret < 0) { | |
1174 | ERR("Send kconsumerd fds failed"); | |
1175 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1176 | goto error; | |
1177 | } | |
1d4b027a | 1178 | |
f3ed775e DG |
1179 | session->kconsumer_fds_sent = 1; |
1180 | } | |
1d4b027a DG |
1181 | |
1182 | error: | |
1183 | return ret; | |
8c0faa1d DG |
1184 | } |
1185 | ||
7a485870 DG |
1186 | /* |
1187 | * Notify kernel thread to update it's pollfd. | |
1188 | */ | |
1189 | static int notify_kernel_pollfd(void) | |
1190 | { | |
1191 | int ret; | |
1192 | ||
1193 | /* Inform kernel thread of the new kernel channel */ | |
1194 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1195 | if (ret < 0) { | |
1196 | perror("write kernel poll pipe"); | |
1197 | } | |
1198 | ||
1199 | return ret; | |
1200 | } | |
1201 | ||
8c0faa1d | 1202 | /* |
d063d709 | 1203 | * Allocate a channel structure and fill it. |
8c0faa1d | 1204 | */ |
ed8f384d | 1205 | static struct lttng_channel *init_default_channel(char *name) |
8c0faa1d | 1206 | { |
f3ed775e | 1207 | struct lttng_channel *chan; |
1d4b027a | 1208 | |
f3ed775e DG |
1209 | chan = malloc(sizeof(struct lttng_channel)); |
1210 | if (chan == NULL) { | |
1211 | perror("init channel malloc"); | |
1212 | goto error; | |
8c0faa1d | 1213 | } |
1d4b027a | 1214 | |
ed8f384d | 1215 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1216 | perror("snprintf channel name"); |
f3ed775e DG |
1217 | return NULL; |
1218 | } | |
1219 | ||
1220 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1221 | chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; | |
1222 | chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; | |
1223 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
1224 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 1225 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
1d4b027a DG |
1226 | |
1227 | error: | |
f3ed775e | 1228 | return chan; |
8c0faa1d DG |
1229 | } |
1230 | ||
333f285e | 1231 | /* |
d063d709 | 1232 | * Create a kernel tracer session then create the default channel. |
333f285e | 1233 | */ |
f3ed775e | 1234 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1235 | { |
f3ed775e | 1236 | int ret; |
f3ed775e DG |
1237 | |
1238 | DBG("Creating kernel session"); | |
1239 | ||
1240 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1241 | if (ret < 0) { | |
1242 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1243 | goto error; | |
333f285e DG |
1244 | } |
1245 | ||
996b65c8 MD |
1246 | ret = mkdir_recursive(session->path, S_IRWXU | S_IRWXG, |
1247 | geteuid(), allowed_group()); | |
7a485870 | 1248 | if (ret < 0) { |
996b65c8 | 1249 | if (ret != -EEXIST) { |
7a485870 DG |
1250 | ERR("Trace directory creation error"); |
1251 | goto error; | |
1252 | } | |
1253 | } | |
1254 | ||
f3ed775e DG |
1255 | error: |
1256 | return ret; | |
333f285e DG |
1257 | } |
1258 | ||
6c9cc2ab DG |
1259 | /* |
1260 | * Using the session list, filled a lttng_session array to send back to the | |
1261 | * client for session listing. | |
1262 | * | |
1263 | * The session list lock MUST be acquired before calling this function. Use | |
1264 | * lock_session_list() and unlock_session_list(). | |
1265 | */ | |
1266 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1267 | { | |
1268 | int i = 0; | |
1269 | struct ltt_session *session; | |
1270 | ||
1271 | DBG("Getting all available session"); | |
1272 | /* | |
1273 | * Iterate over session list and append data after the control struct in | |
1274 | * the buffer. | |
1275 | */ | |
1276 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1277 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
1278 | strncpy(sessions[i].name, session->name, NAME_MAX); | |
1279 | i++; | |
1280 | } | |
1281 | } | |
1282 | ||
9f19cc17 DG |
1283 | /* |
1284 | * Fill lttng_channel array of all channels. | |
1285 | */ | |
1286 | static void list_lttng_channels(struct ltt_session *session, | |
1287 | struct lttng_channel *channels) | |
1288 | { | |
1289 | int i = 0; | |
1290 | struct ltt_kernel_channel *kchan; | |
1291 | ||
1292 | DBG("Listing channels for session %s", session->name); | |
1293 | ||
1294 | /* Kernel channels */ | |
1295 | if (session->kernel_session != NULL) { | |
1296 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1297 | /* Copy lttng_channel struct to array */ | |
1298 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1299 | channels[i].enabled = kchan->enabled; | |
1300 | i++; | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | /* TODO: Missing UST listing */ | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * Fill lttng_event array of all events in the channel. | |
1309 | */ | |
1310 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1311 | struct lttng_event *events) | |
1312 | { | |
1313 | /* | |
1314 | * TODO: This is ONLY kernel. Need UST support. | |
1315 | */ | |
1316 | int i = 0; | |
1317 | struct ltt_kernel_event *event; | |
1318 | ||
1319 | DBG("Listing events for channel %s", kchan->channel->name); | |
1320 | ||
1321 | /* Kernel channels */ | |
1322 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1323 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
1324 | events[i].enabled = event->enabled; | |
1325 | switch (event->event->instrumentation) { | |
1326 | case LTTNG_KERNEL_TRACEPOINT: | |
1327 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1328 | break; | |
1329 | case LTTNG_KERNEL_KPROBE: | |
1330 | case LTTNG_KERNEL_KRETPROBE: | |
1331 | events[i].type = LTTNG_EVENT_PROBE; | |
1332 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1333 | sizeof(struct lttng_kernel_kprobe)); | |
1334 | break; | |
1335 | case LTTNG_KERNEL_FUNCTION: | |
1336 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1337 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1338 | sizeof(struct lttng_kernel_function)); | |
1339 | break; | |
1340 | } | |
1341 | i++; | |
1342 | } | |
1343 | } | |
1344 | ||
fac6795d | 1345 | /* |
d063d709 DG |
1346 | * Process the command requested by the lttng client within the command |
1347 | * context structure. This function make sure that the return structure (llm) | |
1348 | * is set and ready for transmission before returning. | |
fac6795d | 1349 | * |
e065084a | 1350 | * Return any error encountered or 0 for success. |
fac6795d | 1351 | */ |
5461b305 | 1352 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1353 | { |
f40799e8 | 1354 | int ret = LTTCOMM_OK; |
fac6795d | 1355 | |
5461b305 | 1356 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1357 | |
f3ed775e | 1358 | /* Listing commands don't need a session */ |
5461b305 | 1359 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1360 | case LTTNG_CREATE_SESSION: |
1361 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1362 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1363 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1364 | break; |
1365 | default: | |
42abccdb DG |
1366 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1367 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1368 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1369 | /* If session name not found */ |
42abccdb | 1370 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1371 | ret = LTTCOMM_SESS_NOT_FOUND; |
1372 | } else { /* If no session name specified */ | |
1373 | ret = LTTCOMM_SELECT_SESS; | |
1374 | } | |
5461b305 | 1375 | goto error; |
b5541356 DG |
1376 | } else { |
1377 | /* Acquire lock for the session */ | |
1378 | lock_session(cmd_ctx->session); | |
379473d2 | 1379 | } |
5e16da05 | 1380 | break; |
379473d2 DG |
1381 | } |
1382 | ||
f3ed775e | 1383 | /* |
d0254c7c | 1384 | * Check domain type for specific "pre-action". |
f3ed775e | 1385 | */ |
0d0c377a DG |
1386 | switch (cmd_ctx->lsm->domain.type) { |
1387 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1388 | /* Kernel tracer check */ |
20fe2104 | 1389 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1390 | init_kernel_tracer(); |
1391 | if (kernel_tracer_fd == 0) { | |
1392 | ret = LTTCOMM_KERN_NA; | |
1393 | goto error; | |
1394 | } | |
20fe2104 | 1395 | } |
f3ed775e DG |
1396 | |
1397 | /* Need a session for kernel command */ | |
d0254c7c MD |
1398 | switch (cmd_ctx->lsm->cmd_type) { |
1399 | case LTTNG_CREATE_SESSION: | |
1400 | case LTTNG_LIST_SESSIONS: | |
1401 | case LTTNG_LIST_TRACEPOINTS: | |
1402 | case LTTNG_CALIBRATE: | |
1403 | break; | |
1404 | default: | |
1405 | if (cmd_ctx->session->kernel_session == NULL) { | |
1406 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1407 | if (ret < 0) { |
d0254c7c | 1408 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1409 | goto error; |
1410 | } | |
d0254c7c MD |
1411 | |
1412 | /* Start the kernel consumer daemon */ | |
1413 | if (kconsumerd_pid == 0) { | |
1414 | ret = start_kconsumerd(); | |
1415 | if (ret < 0) { | |
1416 | goto error; | |
1417 | } | |
1418 | } | |
f3ed775e DG |
1419 | } |
1420 | } | |
0d0c377a DG |
1421 | break; |
1422 | default: | |
1423 | break; | |
20fe2104 DG |
1424 | } |
1425 | ||
fac6795d | 1426 | /* Process by command type */ |
5461b305 | 1427 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1428 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1429 | { |
b579acd9 | 1430 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1431 | |
1432 | /* Setup lttng message with no payload */ | |
1433 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1434 | if (ret < 0) { | |
1435 | goto setup_error; | |
1436 | } | |
1437 | ||
b579acd9 DG |
1438 | switch (cmd_ctx->lsm->domain.type) { |
1439 | case LTTNG_DOMAIN_KERNEL: | |
1440 | /* Create Kernel context */ | |
1441 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1442 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1443 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1444 | strncpy(kctx.u.perf_counter.name, | |
1445 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1446 | LTTNG_SYMBOL_NAME_LEN); | |
1447 | ||
1448 | /* Add kernel context to kernel tracer. See context.c */ | |
1449 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1450 | cmd_ctx->lsm->u.context.event_name, | |
1451 | cmd_ctx->lsm->u.context.channel_name); | |
1452 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1453 | goto error; |
1454 | } | |
b579acd9 DG |
1455 | break; |
1456 | default: | |
1457 | /* TODO: Userspace tracing */ | |
1458 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1459 | goto error; |
d65106b1 DG |
1460 | } |
1461 | ||
1462 | ret = LTTCOMM_OK; | |
1463 | break; | |
1464 | } | |
0b97ec54 | 1465 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1466 | { |
0b97ec54 | 1467 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1468 | |
1469 | /* Setup lttng message with no payload */ | |
1470 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1471 | if (ret < 0) { | |
1472 | goto setup_error; | |
1473 | } | |
1474 | ||
0b97ec54 DG |
1475 | switch (cmd_ctx->lsm->domain.type) { |
1476 | case LTTNG_DOMAIN_KERNEL: | |
1477 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1478 | cmd_ctx->session->kernel_session); | |
1479 | if (kchan == NULL) { | |
1480 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1481 | goto error; |
0b97ec54 DG |
1482 | } else if (kchan->enabled == 1) { |
1483 | ret = kernel_disable_channel(kchan); | |
1484 | if (ret < 0) { | |
1485 | if (ret != EEXIST) { | |
1486 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1487 | } | |
1488 | goto error; | |
1489 | } | |
26cc6b4e | 1490 | } |
0b97ec54 DG |
1491 | kernel_wait_quiescent(kernel_tracer_fd); |
1492 | break; | |
1493 | default: | |
1494 | /* TODO: Userspace tracing */ | |
1495 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1496 | goto error; | |
26cc6b4e DG |
1497 | } |
1498 | ||
26cc6b4e DG |
1499 | ret = LTTCOMM_OK; |
1500 | break; | |
1501 | } | |
f5177a38 | 1502 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1503 | { |
f5177a38 DG |
1504 | struct ltt_kernel_channel *kchan; |
1505 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1506 | |
1507 | /* Setup lttng message with no payload */ | |
1508 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1509 | if (ret < 0) { | |
1510 | goto setup_error; | |
1511 | } | |
1512 | ||
f5177a38 DG |
1513 | switch (cmd_ctx->lsm->domain.type) { |
1514 | case LTTNG_DOMAIN_KERNEL: | |
1515 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1516 | cmd_ctx->session->kernel_session); | |
1517 | if (kchan == NULL) { | |
1518 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1519 | goto error; |
e953ef25 | 1520 | } |
f5177a38 DG |
1521 | |
1522 | kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); | |
1523 | if (kevent != NULL) { | |
1524 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1525 | kchan->channel->name); | |
1526 | ret = kernel_disable_event(kevent); | |
1527 | if (ret < 0) { | |
1528 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1529 | goto error; | |
1530 | } | |
1531 | } | |
1532 | ||
1533 | kernel_wait_quiescent(kernel_tracer_fd); | |
1534 | break; | |
1535 | default: | |
1536 | /* TODO: Userspace tracing */ | |
1537 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1538 | goto error; | |
e953ef25 DG |
1539 | } |
1540 | ||
19e70852 | 1541 | ret = LTTCOMM_OK; |
e953ef25 DG |
1542 | break; |
1543 | } | |
f5177a38 | 1544 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1545 | { |
f5177a38 DG |
1546 | struct ltt_kernel_channel *kchan; |
1547 | struct ltt_kernel_event *kevent; | |
950131af DG |
1548 | |
1549 | /* Setup lttng message with no payload */ | |
1550 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1551 | if (ret < 0) { | |
1552 | goto setup_error; | |
1553 | } | |
1554 | ||
f5177a38 DG |
1555 | switch (cmd_ctx->lsm->domain.type) { |
1556 | case LTTNG_DOMAIN_KERNEL: | |
1557 | DBG("Disabling all enabled kernel events"); | |
1558 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1559 | cmd_ctx->session->kernel_session); | |
1560 | if (kchan == NULL) { | |
1561 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1562 | goto error; | |
1563 | } | |
950131af | 1564 | |
f5177a38 DG |
1565 | /* For each event in the kernel session */ |
1566 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1567 | DBG("Disabling kernel event %s for channel %s.", | |
1568 | kevent->event->name, kchan->channel->name); | |
1569 | ret = kernel_disable_event(kevent); | |
1570 | if (ret < 0) { | |
1571 | continue; | |
1572 | } | |
950131af | 1573 | } |
f5177a38 DG |
1574 | |
1575 | /* Quiescent wait after event disable */ | |
1576 | kernel_wait_quiescent(kernel_tracer_fd); | |
1577 | break; | |
1578 | default: | |
1579 | /* TODO: Userspace tracing */ | |
1580 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1581 | goto error; | |
950131af DG |
1582 | } |
1583 | ||
950131af DG |
1584 | ret = LTTCOMM_OK; |
1585 | break; | |
1586 | } | |
0d0c377a | 1587 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 1588 | { |
0d0c377a | 1589 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
1590 | |
1591 | /* Setup lttng message with no payload */ | |
1592 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1593 | if (ret < 0) { | |
1594 | goto setup_error; | |
1595 | } | |
1596 | ||
0d0c377a DG |
1597 | switch (cmd_ctx->lsm->domain.type) { |
1598 | case LTTNG_DOMAIN_KERNEL: | |
1599 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, | |
1600 | cmd_ctx->session->kernel_session); | |
1601 | if (kchan == NULL) { | |
1602 | /* Channel not found, creating it */ | |
1603 | DBG("Creating kernel channel"); | |
7d29a247 | 1604 | |
0d0c377a DG |
1605 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
1606 | &cmd_ctx->lsm->u.channel.chan, cmd_ctx->session->path); | |
1607 | if (ret < 0) { | |
1608 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1609 | goto error; | |
1610 | } | |
7d29a247 | 1611 | |
0d0c377a DG |
1612 | /* Notify kernel thread that there is a new channel */ |
1613 | ret = notify_kernel_pollfd(); | |
1614 | if (ret < 0) { | |
1615 | ret = LTTCOMM_FATAL; | |
1616 | goto error; | |
1617 | } | |
1618 | } else if (kchan->enabled == 0) { | |
1619 | ret = kernel_enable_channel(kchan); | |
1620 | if (ret < 0) { | |
1621 | if (ret != EEXIST) { | |
1622 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
1623 | } | |
1624 | goto error; | |
d36b8583 | 1625 | } |
d36b8583 | 1626 | } |
0d0c377a DG |
1627 | |
1628 | kernel_wait_quiescent(kernel_tracer_fd); | |
1629 | break; | |
1630 | default: | |
1631 | /* TODO: Userspace tracing */ | |
1632 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1633 | goto error; | |
d36b8583 DG |
1634 | } |
1635 | ||
d36b8583 DG |
1636 | ret = LTTCOMM_OK; |
1637 | break; | |
1638 | } | |
0d0c377a | 1639 | case LTTNG_ENABLE_EVENT: |
894be886 | 1640 | { |
7d29a247 DG |
1641 | char *channel_name; |
1642 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 1643 | struct ltt_kernel_event *kevent; |
7d29a247 | 1644 | struct lttng_channel *chan; |
f3ed775e | 1645 | |
894be886 DG |
1646 | /* Setup lttng message with no payload */ |
1647 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1648 | if (ret < 0) { | |
1649 | goto setup_error; | |
1650 | } | |
1651 | ||
7d29a247 DG |
1652 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1653 | ||
0d0c377a DG |
1654 | switch (cmd_ctx->lsm->domain.type) { |
1655 | case LTTNG_DOMAIN_KERNEL: | |
1656 | do { | |
1657 | kchan = get_kernel_channel_by_name(channel_name, | |
1658 | cmd_ctx->session->kernel_session); | |
1659 | if (kchan == NULL) { | |
1660 | DBG("Channel not found. Creating channel %s", channel_name); | |
1661 | ||
1662 | chan = init_default_channel(channel_name); | |
1663 | if (chan == NULL) { | |
1664 | ret = LTTCOMM_FATAL; | |
1665 | goto error; | |
1666 | } | |
7d29a247 | 1667 | |
0d0c377a DG |
1668 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
1669 | chan, cmd_ctx->session->path); | |
1670 | if (ret < 0) { | |
1671 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1672 | goto error; | |
1673 | } | |
7d29a247 | 1674 | } |
0d0c377a | 1675 | } while (kchan == NULL); |
7d29a247 | 1676 | |
0d0c377a DG |
1677 | kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
1678 | if (kevent == NULL) { | |
1679 | DBG("Creating kernel event %s for channel %s.", | |
1680 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
1681 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
1682 | } else { | |
1683 | DBG("Enabling kernel event %s for channel %s.", | |
1684 | kevent->event->name, channel_name); | |
1685 | ret = kernel_enable_event(kevent); | |
1686 | if (ret == -EEXIST) { | |
1687 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
1688 | goto error; |
1689 | } | |
1690 | } | |
f34daff7 | 1691 | |
0d0c377a DG |
1692 | if (ret < 0) { |
1693 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
1694 | goto error; |
1695 | } | |
19e70852 | 1696 | |
0d0c377a DG |
1697 | kernel_wait_quiescent(kernel_tracer_fd); |
1698 | break; | |
1699 | default: | |
1700 | /* TODO: Userspace tracing */ | |
1701 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 1702 | goto error; |
f3ed775e | 1703 | } |
19e70852 | 1704 | ret = LTTCOMM_OK; |
894be886 DG |
1705 | break; |
1706 | } | |
0d0c377a | 1707 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 1708 | { |
9f19cc17 DG |
1709 | int size, i; |
1710 | char *channel_name; | |
7d29a247 | 1711 | struct ltt_kernel_channel *kchan; |
0d0c377a | 1712 | struct ltt_kernel_event *kevent; |
9f19cc17 | 1713 | struct lttng_event *event_list; |
7d29a247 | 1714 | struct lttng_channel *chan; |
33a2b854 DG |
1715 | |
1716 | /* Setup lttng message with no payload */ | |
1717 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1718 | if (ret < 0) { | |
1719 | goto setup_error; | |
1720 | } | |
1721 | ||
1722 | DBG("Enabling all kernel event"); | |
1723 | ||
7d29a247 DG |
1724 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1725 | ||
0d0c377a DG |
1726 | switch (cmd_ctx->lsm->domain.type) { |
1727 | case LTTNG_DOMAIN_KERNEL: | |
1728 | do { | |
1729 | kchan = get_kernel_channel_by_name(channel_name, | |
1730 | cmd_ctx->session->kernel_session); | |
1731 | if (kchan == NULL) { | |
1732 | DBG("Channel not found. Creating channel %s", channel_name); | |
1733 | ||
1734 | chan = init_default_channel(channel_name); | |
1735 | if (chan == NULL) { | |
1736 | ret = LTTCOMM_FATAL; | |
1737 | goto error; | |
1738 | } | |
7d29a247 | 1739 | |
0d0c377a DG |
1740 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
1741 | chan, cmd_ctx->session->path); | |
1742 | if (ret < 0) { | |
1743 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1744 | goto error; | |
1745 | } | |
7d29a247 | 1746 | } |
0d0c377a | 1747 | } while (kchan == NULL); |
7d29a247 | 1748 | |
0d0c377a DG |
1749 | /* For each event in the kernel session */ |
1750 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1751 | DBG("Enabling kernel event %s for channel %s.", | |
1752 | kevent->event->name, channel_name); | |
1753 | ret = kernel_enable_event(kevent); | |
7d29a247 | 1754 | if (ret < 0) { |
0d0c377a | 1755 | continue; |
7d29a247 DG |
1756 | } |
1757 | } | |
33a2b854 | 1758 | |
0d0c377a DG |
1759 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
1760 | if (size < 0) { | |
1761 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1762 | goto error; | |
f3ed775e | 1763 | } |
f3ed775e | 1764 | |
0d0c377a DG |
1765 | for (i = 0; i < size; i++) { |
1766 | kevent = get_kernel_event_by_name(event_list[i].name, kchan); | |
1767 | if (kevent == NULL) { | |
1768 | /* Default event type for enable all */ | |
1769 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
1770 | /* Enable each single tracepoint event */ | |
1771 | ret = kernel_create_event(&event_list[i], kchan); | |
1772 | if (ret < 0) { | |
1773 | /* Ignore error here and continue */ | |
1774 | } | |
950131af | 1775 | } |
33a2b854 | 1776 | } |
33a2b854 | 1777 | |
0d0c377a DG |
1778 | free(event_list); |
1779 | ||
1780 | /* Quiescent wait after event enable */ | |
1781 | kernel_wait_quiescent(kernel_tracer_fd); | |
1782 | break; | |
1783 | default: | |
1784 | /* TODO: Userspace tracing */ | |
1785 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1786 | goto error; | |
1787 | } | |
33a2b854 DG |
1788 | |
1789 | ret = LTTCOMM_OK; | |
1790 | break; | |
1791 | } | |
052da939 | 1792 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 1793 | { |
9f19cc17 | 1794 | struct lttng_event *events; |
052da939 DG |
1795 | ssize_t nb_events = 0; |
1796 | ||
1797 | switch (cmd_ctx->lsm->domain.type) { | |
1798 | case LTTNG_DOMAIN_KERNEL: | |
1799 | DBG("Listing kernel events"); | |
1800 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
1801 | if (nb_events < 0) { | |
1802 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1803 | goto error; | |
1804 | } | |
1805 | break; | |
1806 | default: | |
1807 | /* TODO: Userspace listing */ | |
1808 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1809 | break; | |
2ef84c95 DG |
1810 | } |
1811 | ||
1812 | /* | |
1813 | * Setup lttng message with payload size set to the event list size in | |
1814 | * bytes and then copy list into the llm payload. | |
1815 | */ | |
052da939 | 1816 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 1817 | if (ret < 0) { |
052da939 | 1818 | free(events); |
2ef84c95 DG |
1819 | goto setup_error; |
1820 | } | |
1821 | ||
1822 | /* Copy event list into message payload */ | |
9f19cc17 | 1823 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 1824 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 1825 | |
9f19cc17 | 1826 | free(events); |
2ef84c95 DG |
1827 | |
1828 | ret = LTTCOMM_OK; | |
1829 | break; | |
1830 | } | |
f3ed775e | 1831 | case LTTNG_START_TRACE: |
8c0faa1d DG |
1832 | { |
1833 | struct ltt_kernel_channel *chan; | |
f3ed775e | 1834 | |
8c0faa1d DG |
1835 | /* Setup lttng message with no payload */ |
1836 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1837 | if (ret < 0) { | |
1838 | goto setup_error; | |
1839 | } | |
1840 | ||
f3ed775e DG |
1841 | /* Kernel tracing */ |
1842 | if (cmd_ctx->session->kernel_session != NULL) { | |
1843 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
1844 | DBG("Open kernel metadata"); | |
58a97671 DG |
1845 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
1846 | cmd_ctx->session->path); | |
f3ed775e DG |
1847 | if (ret < 0) { |
1848 | ret = LTTCOMM_KERN_META_FAIL; | |
1849 | goto error; | |
1850 | } | |
1851 | } | |
8c0faa1d | 1852 | |
f3ed775e DG |
1853 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
1854 | DBG("Opening kernel metadata stream"); | |
1855 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
1856 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
1857 | if (ret < 0) { | |
1858 | ERR("Kernel create metadata stream failed"); | |
1859 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1860 | goto error; | |
1861 | } | |
1862 | } | |
1863 | } | |
8c0faa1d | 1864 | |
f3ed775e | 1865 | /* For each channel */ |
0d0c377a DG |
1866 | cds_list_for_each_entry(chan, |
1867 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
1868 | if (chan->stream_count == 0) { |
1869 | ret = kernel_open_channel_stream(chan); | |
1870 | if (ret < 0) { | |
1871 | ERR("Kernel create channel stream failed"); | |
1872 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1873 | goto error; | |
1874 | } | |
1875 | /* Update the stream global counter */ | |
1876 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
1877 | } | |
1878 | } | |
1879 | ||
1880 | DBG("Start kernel tracing"); | |
1881 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
8c0faa1d | 1882 | if (ret < 0) { |
f3ed775e DG |
1883 | ERR("Kernel start session failed"); |
1884 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1885 | goto error; |
1886 | } | |
8c0faa1d | 1887 | |
f3ed775e DG |
1888 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
1889 | if (ret < 0) { | |
1890 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1891 | goto error; |
1892 | } | |
8c0faa1d | 1893 | |
f3ed775e DG |
1894 | /* Quiescent wait after starting trace */ |
1895 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1896 | } |
1897 | ||
f3ed775e | 1898 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
1899 | |
1900 | ret = LTTCOMM_OK; | |
1901 | break; | |
1902 | } | |
f3ed775e | 1903 | case LTTNG_STOP_TRACE: |
8c0faa1d | 1904 | { |
f3ed775e | 1905 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
1906 | /* Setup lttng message with no payload */ |
1907 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1908 | if (ret < 0) { | |
1909 | goto setup_error; | |
1910 | } | |
1911 | ||
f3ed775e DG |
1912 | /* Kernel tracer */ |
1913 | if (cmd_ctx->session->kernel_session != NULL) { | |
1914 | DBG("Stop kernel tracing"); | |
84291629 | 1915 | |
f3ed775e DG |
1916 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
1917 | if (ret < 0) { | |
1918 | ERR("Kernel metadata flush failed"); | |
1919 | } | |
8c0faa1d | 1920 | |
f3ed775e DG |
1921 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
1922 | ret = kernel_flush_buffer(chan); | |
1923 | if (ret < 0) { | |
1924 | ERR("Kernel flush buffer error"); | |
1925 | } | |
1926 | } | |
1927 | ||
1928 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
1929 | if (ret < 0) { | |
1930 | ERR("Kernel stop session failed"); | |
1931 | ret = LTTCOMM_KERN_STOP_FAIL; | |
1932 | goto error; | |
1933 | } | |
1934 | ||
1935 | /* Quiescent wait after stopping trace */ | |
1936 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1937 | } |
1938 | ||
f3ed775e | 1939 | /* TODO : User-space tracer */ |
8c0faa1d DG |
1940 | |
1941 | ret = LTTCOMM_OK; | |
1942 | break; | |
1943 | } | |
5e16da05 MD |
1944 | case LTTNG_CREATE_SESSION: |
1945 | { | |
5461b305 DG |
1946 | /* Setup lttng message with no payload */ |
1947 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1948 | if (ret < 0) { | |
1949 | goto setup_error; | |
1950 | } | |
1951 | ||
42abccdb | 1952 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
5e16da05 | 1953 | if (ret < 0) { |
f3ed775e | 1954 | if (ret == -EEXIST) { |
5e16da05 MD |
1955 | ret = LTTCOMM_EXIST_SESS; |
1956 | } else { | |
aaf97519 | 1957 | ret = LTTCOMM_FATAL; |
aaf97519 | 1958 | } |
5461b305 | 1959 | goto error; |
8028d920 | 1960 | } |
1657e9bb | 1961 | |
5461b305 | 1962 | ret = LTTCOMM_OK; |
5e16da05 MD |
1963 | break; |
1964 | } | |
1965 | case LTTNG_DESTROY_SESSION: | |
1966 | { | |
5461b305 DG |
1967 | /* Setup lttng message with no payload */ |
1968 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1969 | if (ret < 0) { | |
1970 | goto setup_error; | |
1971 | } | |
1972 | ||
f3ed775e DG |
1973 | /* Clean kernel session teardown */ |
1974 | teardown_kernel_session(cmd_ctx->session); | |
1975 | ||
42abccdb | 1976 | ret = destroy_session(cmd_ctx->lsm->session.name); |
5e16da05 | 1977 | if (ret < 0) { |
f3ed775e | 1978 | ret = LTTCOMM_FATAL; |
5461b305 | 1979 | goto error; |
5e16da05 | 1980 | } |
1657e9bb | 1981 | |
7a485870 DG |
1982 | /* |
1983 | * Must notify the kernel thread here to update it's pollfd in order to | |
1984 | * remove the channel(s)' fd just destroyed. | |
1985 | */ | |
1986 | ret = notify_kernel_pollfd(); | |
1987 | if (ret < 0) { | |
1988 | ret = LTTCOMM_FATAL; | |
1989 | goto error; | |
1990 | } | |
1991 | ||
5461b305 DG |
1992 | ret = LTTCOMM_OK; |
1993 | break; | |
5e16da05 | 1994 | } |
9f19cc17 | 1995 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 1996 | { |
4b222185 | 1997 | size_t nb_dom = 0; |
5461b305 | 1998 | |
9f19cc17 DG |
1999 | if (cmd_ctx->session->kernel_session != NULL) { |
2000 | nb_dom++; | |
ce3d728c | 2001 | } |
520ff687 | 2002 | |
9f19cc17 DG |
2003 | nb_dom += cmd_ctx->session->ust_trace_count; |
2004 | ||
2005 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2006 | if (ret < 0) { |
2007 | goto setup_error; | |
520ff687 | 2008 | } |
57167058 | 2009 | |
9f19cc17 DG |
2010 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2011 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2012 | |
9f19cc17 | 2013 | /* TODO: User-space tracer domain support */ |
5461b305 | 2014 | ret = LTTCOMM_OK; |
5e16da05 MD |
2015 | break; |
2016 | } | |
9f19cc17 | 2017 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2018 | { |
9f19cc17 DG |
2019 | /* |
2020 | * TODO: Only kernel channels are listed here. UST listing | |
2021 | * is needed on lttng-ust 2.0 release. | |
2022 | */ | |
2023 | size_t nb_chan = 0; | |
2024 | if (cmd_ctx->session->kernel_session != NULL) { | |
2025 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2026 | } |
ca95a216 | 2027 | |
9f19cc17 DG |
2028 | ret = setup_lttng_msg(cmd_ctx, |
2029 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2030 | if (ret < 0) { |
2031 | goto setup_error; | |
2032 | } | |
9f19cc17 DG |
2033 | |
2034 | list_lttng_channels(cmd_ctx->session, | |
2035 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2036 | ||
2037 | ret = LTTCOMM_OK; | |
5461b305 | 2038 | break; |
5e16da05 | 2039 | } |
9f19cc17 | 2040 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2041 | { |
9f19cc17 DG |
2042 | /* |
2043 | * TODO: Only kernel events are listed here. UST listing | |
2044 | * is needed on lttng-ust 2.0 release. | |
2045 | */ | |
2046 | size_t nb_event = 0; | |
2047 | struct ltt_kernel_channel *kchan = NULL; | |
2048 | ||
2049 | if (cmd_ctx->session->kernel_session != NULL) { | |
2050 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.list.channel_name, | |
2051 | cmd_ctx->session->kernel_session); | |
2052 | if (kchan == NULL) { | |
2053 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2054 | goto error; | |
2055 | } | |
2056 | nb_event += kchan->event_count; | |
5461b305 | 2057 | } |
ca95a216 | 2058 | |
9f19cc17 DG |
2059 | ret = setup_lttng_msg(cmd_ctx, |
2060 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2061 | if (ret < 0) { |
2062 | goto setup_error; | |
2063 | } | |
9f19cc17 DG |
2064 | |
2065 | DBG("Listing events (%ld events)", nb_event); | |
2066 | ||
2067 | list_lttng_events(kchan, | |
2068 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2069 | ||
2070 | ret = LTTCOMM_OK; | |
5461b305 | 2071 | break; |
5e16da05 MD |
2072 | } |
2073 | case LTTNG_LIST_SESSIONS: | |
2074 | { | |
6c9cc2ab | 2075 | lock_session_list(); |
5461b305 | 2076 | |
6c9cc2ab | 2077 | if (session_list_ptr->count == 0) { |
f3ed775e | 2078 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2079 | unlock_session_list(); |
5461b305 | 2080 | goto error; |
57167058 | 2081 | } |
5e16da05 | 2082 | |
6c9cc2ab DG |
2083 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2084 | session_list_ptr->count); | |
5461b305 | 2085 | if (ret < 0) { |
36a83748 | 2086 | unlock_session_list(); |
5461b305 | 2087 | goto setup_error; |
e065084a | 2088 | } |
5e16da05 | 2089 | |
6c9cc2ab DG |
2090 | /* Filled the session array */ |
2091 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2092 | ||
2093 | unlock_session_list(); | |
5e16da05 | 2094 | |
5461b305 | 2095 | ret = LTTCOMM_OK; |
5e16da05 MD |
2096 | break; |
2097 | } | |
d0254c7c MD |
2098 | |
2099 | case LTTNG_CALIBRATE: | |
2100 | { | |
2101 | /* Setup lttng message with no payload */ | |
2102 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2103 | if (ret < 0) { | |
2104 | goto setup_error; | |
2105 | } | |
2106 | ||
2107 | switch (cmd_ctx->lsm->domain.type) { | |
2108 | case LTTNG_DOMAIN_KERNEL: | |
2109 | { | |
2110 | struct lttng_kernel_calibrate kcalibrate; | |
2111 | ||
2112 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2113 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2114 | if (ret < 0) { | |
2115 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2116 | goto error; | |
2117 | } | |
2118 | break; | |
2119 | } | |
2120 | default: | |
2121 | /* TODO: Userspace tracing */ | |
2122 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2123 | goto error; | |
2124 | } | |
2125 | ret = LTTCOMM_OK; | |
2126 | break; | |
2127 | } | |
2128 | ||
5e16da05 MD |
2129 | default: |
2130 | /* Undefined command */ | |
5461b305 DG |
2131 | ret = setup_lttng_msg(cmd_ctx, 0); |
2132 | if (ret < 0) { | |
2133 | goto setup_error; | |
2134 | } | |
2135 | ||
5e16da05 | 2136 | ret = LTTCOMM_UND; |
5461b305 | 2137 | break; |
fac6795d DG |
2138 | } |
2139 | ||
5461b305 DG |
2140 | /* Set return code */ |
2141 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2142 | |
b5541356 DG |
2143 | if (cmd_ctx->session) { |
2144 | unlock_session(cmd_ctx->session); | |
2145 | } | |
2146 | ||
e065084a DG |
2147 | return ret; |
2148 | ||
5461b305 | 2149 | error: |
5461b305 DG |
2150 | if (cmd_ctx->llm == NULL) { |
2151 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2152 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2153 | goto setup_error; |
2154 | } | |
2155 | } | |
e065084a | 2156 | /* Notify client of error */ |
5461b305 | 2157 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2158 | |
5461b305 | 2159 | setup_error: |
b5541356 DG |
2160 | if (cmd_ctx->session) { |
2161 | unlock_session(cmd_ctx->session); | |
2162 | } | |
8028d920 | 2163 | return ret; |
fac6795d DG |
2164 | } |
2165 | ||
1d4b027a | 2166 | /* |
d063d709 DG |
2167 | * This thread manage all clients request using the unix client socket for |
2168 | * communication. | |
1d4b027a DG |
2169 | */ |
2170 | static void *thread_manage_clients(void *data) | |
2171 | { | |
273ea72c DG |
2172 | int sock = 0, ret; |
2173 | struct command_ctx *cmd_ctx = NULL; | |
2174 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2175 | |
2176 | DBG("[thread] Manage client started"); | |
2177 | ||
2178 | ret = lttcomm_listen_unix_sock(client_sock); | |
2179 | if (ret < 0) { | |
2180 | goto error; | |
2181 | } | |
2182 | ||
273ea72c DG |
2183 | /* First fd is always the quit pipe */ |
2184 | pollfd[0].fd = thread_quit_pipe[0]; | |
2185 | ||
2186 | /* Apps socket */ | |
2187 | pollfd[1].fd = client_sock; | |
2188 | pollfd[1].events = POLLIN; | |
2189 | ||
1d4b027a DG |
2190 | /* Notify parent pid that we are ready |
2191 | * to accept command for client side. | |
2192 | */ | |
2193 | if (opt_sig_parent) { | |
2194 | kill(ppid, SIGCHLD); | |
2195 | } | |
2196 | ||
2197 | while (1) { | |
1d4b027a | 2198 | DBG("Accepting client command ..."); |
273ea72c DG |
2199 | |
2200 | /* Inifinite blocking call, waiting for transmission */ | |
2201 | ret = poll(pollfd, 2, -1); | |
2202 | if (ret < 0) { | |
2203 | perror("poll client thread"); | |
2204 | goto error; | |
2205 | } | |
2206 | ||
2207 | /* Thread quit pipe has been closed. Killing thread. */ | |
2208 | if (pollfd[0].revents == POLLNVAL) { | |
2209 | goto error; | |
2210 | } else if (pollfd[1].revents == POLLERR) { | |
2211 | ERR("Client socket poll error"); | |
2212 | goto error; | |
2213 | } | |
2214 | ||
1d4b027a DG |
2215 | sock = lttcomm_accept_unix_sock(client_sock); |
2216 | if (sock < 0) { | |
2217 | goto error; | |
2218 | } | |
2219 | ||
2220 | /* Allocate context command to process the client request */ | |
2221 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2222 | ||
2223 | /* Allocate data buffer for reception */ | |
2224 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2225 | cmd_ctx->llm = NULL; | |
2226 | cmd_ctx->session = NULL; | |
2227 | ||
2228 | /* | |
2229 | * Data is received from the lttng client. The struct | |
2230 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2231 | * the client. | |
2232 | */ | |
2233 | DBG("Receiving data from client ..."); | |
2234 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2235 | if (ret <= 0) { | |
2236 | continue; | |
2237 | } | |
2238 | ||
f7776ea7 DG |
2239 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2240 | ||
1d4b027a DG |
2241 | /* |
2242 | * This function dispatch the work to the kernel or userspace tracer | |
2243 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2244 | * informations for the client. The command context struct contains | |
2245 | * everything this function may needs. | |
2246 | */ | |
2247 | ret = process_client_msg(cmd_ctx); | |
2248 | if (ret < 0) { | |
2249 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2250 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2251 | /* Error detected but still accept command */ | |
a2fb29a5 | 2252 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2253 | continue; |
2254 | } | |
2255 | ||
2256 | DBG("Sending response (size: %d, retcode: %d)", | |
2257 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2258 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2259 | if (ret < 0) { | |
2260 | ERR("Failed to send data back to client"); | |
2261 | } | |
2262 | ||
a2fb29a5 | 2263 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2264 | |
2265 | /* End of transmission */ | |
2266 | close(sock); | |
1d4b027a DG |
2267 | } |
2268 | ||
2269 | error: | |
273ea72c DG |
2270 | DBG("Client thread dying"); |
2271 | if (client_sock) { | |
2272 | close(client_sock); | |
2273 | } | |
2274 | if (sock) { | |
2275 | close(sock); | |
2276 | } | |
2277 | ||
2278 | unlink(client_unix_sock_path); | |
2279 | ||
a2fb29a5 | 2280 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2281 | return NULL; |
2282 | } | |
2283 | ||
2284 | ||
fac6795d DG |
2285 | /* |
2286 | * usage function on stderr | |
2287 | */ | |
2288 | static void usage(void) | |
2289 | { | |
b716ce68 | 2290 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2291 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2292 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2293 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2294 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2295 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2296 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2297 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2298 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2299 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2300 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2301 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2302 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2303 | } |
2304 | ||
2305 | /* | |
2306 | * daemon argument parsing | |
2307 | */ | |
2308 | static int parse_args(int argc, char **argv) | |
2309 | { | |
2310 | int c; | |
2311 | ||
2312 | static struct option long_options[] = { | |
2313 | { "client-sock", 1, 0, 'c' }, | |
2314 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2315 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2316 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2317 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2318 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2319 | { "help", 0, 0, 'h' }, |
2320 | { "group", 1, 0, 'g' }, | |
2321 | { "version", 0, 0, 'V' }, | |
75462a81 | 2322 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2323 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2324 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2325 | { NULL, 0, 0, 0 } |
2326 | }; | |
2327 | ||
2328 | while (1) { | |
2329 | int option_index = 0; | |
31f73cc9 | 2330 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2331 | if (c == -1) { |
2332 | break; | |
2333 | } | |
2334 | ||
2335 | switch (c) { | |
2336 | case 0: | |
2337 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2338 | if (optarg) { | |
2339 | fprintf(stderr, " with arg %s\n", optarg); | |
2340 | } | |
2341 | break; | |
b716ce68 | 2342 | case 'c': |
fac6795d DG |
2343 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2344 | break; | |
2345 | case 'a': | |
2346 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2347 | break; | |
2348 | case 'd': | |
2349 | opt_daemon = 1; | |
2350 | break; | |
2351 | case 'g': | |
2352 | opt_tracing_group = strdup(optarg); | |
2353 | break; | |
2354 | case 'h': | |
2355 | usage(); | |
2356 | exit(EXIT_FAILURE); | |
2357 | case 'V': | |
2358 | fprintf(stdout, "%s\n", VERSION); | |
2359 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2360 | case 'S': |
2361 | opt_sig_parent = 1; | |
2362 | break; | |
d6f42150 DG |
2363 | case 'E': |
2364 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2365 | break; | |
2366 | case 'C': | |
2367 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2368 | break; | |
75462a81 DG |
2369 | case 'q': |
2370 | opt_quiet = 1; | |
2371 | break; | |
3f9947db | 2372 | case 'v': |
53086306 DG |
2373 | /* Verbose level can increase using multiple -v */ |
2374 | opt_verbose += 1; | |
3f9947db | 2375 | break; |
31f73cc9 MD |
2376 | case 'Z': |
2377 | opt_verbose_kconsumerd += 1; | |
2378 | break; | |
fac6795d DG |
2379 | default: |
2380 | /* Unknown option or other error. | |
2381 | * Error is printed by getopt, just return */ | |
2382 | return -1; | |
2383 | } | |
2384 | } | |
2385 | ||
2386 | return 0; | |
2387 | } | |
2388 | ||
2389 | /* | |
d063d709 | 2390 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2391 | * apps_sock - The communication socket for all UST apps. |
2392 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2393 | */ |
cf3af59e | 2394 | static int init_daemon_socket(void) |
fac6795d DG |
2395 | { |
2396 | int ret = 0; | |
2397 | mode_t old_umask; | |
2398 | ||
2399 | old_umask = umask(0); | |
2400 | ||
2401 | /* Create client tool unix socket */ | |
d6f42150 DG |
2402 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2403 | if (client_sock < 0) { | |
2404 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2405 | ret = -1; |
2406 | goto end; | |
2407 | } | |
2408 | ||
2409 | /* File permission MUST be 660 */ | |
2410 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2411 | if (ret < 0) { | |
d6f42150 | 2412 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2413 | perror("chmod"); |
2414 | goto end; | |
2415 | } | |
2416 | ||
2417 | /* Create the application unix socket */ | |
d6f42150 DG |
2418 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2419 | if (apps_sock < 0) { | |
2420 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2421 | ret = -1; |
2422 | goto end; | |
2423 | } | |
2424 | ||
d6f42150 | 2425 | /* File permission MUST be 666 */ |
fac6795d DG |
2426 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2427 | if (ret < 0) { | |
d6f42150 | 2428 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2429 | perror("chmod"); |
2430 | goto end; | |
2431 | } | |
2432 | ||
2433 | end: | |
2434 | umask(old_umask); | |
2435 | return ret; | |
2436 | } | |
2437 | ||
2438 | /* | |
7d8234d9 MD |
2439 | * Check if the global socket is available, and if a daemon is answering |
2440 | * at the other side. If yes, error is returned. | |
fac6795d | 2441 | */ |
cf3af59e | 2442 | static int check_existing_daemon(void) |
fac6795d | 2443 | { |
7d8234d9 MD |
2444 | if (access(client_unix_sock_path, F_OK) < 0 && |
2445 | access(apps_unix_sock_path, F_OK) < 0) | |
2446 | return 0; | |
2447 | /* Is there anybody out there ? */ | |
2448 | if (lttng_session_daemon_alive()) | |
2449 | return -EEXIST; | |
2450 | else | |
2451 | return 0; | |
fac6795d DG |
2452 | } |
2453 | ||
fac6795d | 2454 | /* |
d063d709 | 2455 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2456 | * |
d063d709 DG |
2457 | * Race window between mkdir and chown is OK because we are going from more |
2458 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2459 | */ |
d6f42150 | 2460 | static int set_permissions(void) |
fac6795d DG |
2461 | { |
2462 | int ret; | |
996b65c8 | 2463 | gid_t gid; |
fac6795d | 2464 | |
996b65c8 MD |
2465 | gid = allowed_group(); |
2466 | if (gid < 0) { | |
a463f419 DG |
2467 | if (is_root) { |
2468 | WARN("No tracing group detected"); | |
2469 | ret = 0; | |
2470 | } else { | |
2471 | ERR("Missing tracing group. Aborting execution."); | |
2472 | ret = -1; | |
2473 | } | |
fac6795d DG |
2474 | goto end; |
2475 | } | |
2476 | ||
d6f42150 | 2477 | /* Set lttng run dir */ |
996b65c8 | 2478 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
2479 | if (ret < 0) { |
2480 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2481 | perror("chown"); | |
2482 | } | |
2483 | ||
2484 | /* lttng client socket path */ | |
996b65c8 | 2485 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 2486 | if (ret < 0) { |
d6f42150 DG |
2487 | ERR("Unable to set group on %s", client_unix_sock_path); |
2488 | perror("chown"); | |
2489 | } | |
2490 | ||
2491 | /* kconsumerd error socket path */ | |
996b65c8 | 2492 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
2493 | if (ret < 0) { |
2494 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2495 | perror("chown"); |
2496 | } | |
2497 | ||
d6f42150 | 2498 | DBG("All permissions are set"); |
e07ae692 | 2499 | |
fac6795d DG |
2500 | end: |
2501 | return ret; | |
2502 | } | |
2503 | ||
7a485870 | 2504 | /* |
d063d709 | 2505 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2506 | */ |
2507 | static int create_kernel_poll_pipe(void) | |
2508 | { | |
2509 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2510 | } | |
2511 | ||
d6f42150 | 2512 | /* |
d063d709 | 2513 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2514 | */ |
2515 | static int create_lttng_rundir(void) | |
2516 | { | |
2517 | int ret; | |
2518 | ||
2519 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2520 | if (ret < 0) { | |
b1f11e69 DG |
2521 | if (errno != EEXIST) { |
2522 | ERR("Unable to create " LTTNG_RUNDIR); | |
2523 | goto error; | |
2524 | } else { | |
2525 | ret = 0; | |
2526 | } | |
d6f42150 DG |
2527 | } |
2528 | ||
2529 | error: | |
2530 | return ret; | |
2531 | } | |
2532 | ||
2533 | /* | |
d063d709 DG |
2534 | * Setup sockets and directory needed by the kconsumerd communication with the |
2535 | * session daemon. | |
d6f42150 DG |
2536 | */ |
2537 | static int set_kconsumerd_sockets(void) | |
2538 | { | |
2539 | int ret; | |
2540 | ||
2541 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2542 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2543 | } | |
2544 | ||
2545 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2546 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2547 | } | |
2548 | ||
2549 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2550 | if (ret < 0) { | |
6beb2242 DG |
2551 | if (errno != EEXIST) { |
2552 | ERR("Failed to create " KCONSUMERD_PATH); | |
2553 | goto error; | |
2554 | } | |
2555 | ret = 0; | |
d6f42150 DG |
2556 | } |
2557 | ||
2558 | /* Create the kconsumerd error unix socket */ | |
2559 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
2560 | if (kconsumerd_err_sock < 0) { | |
2561 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
2562 | ret = -1; | |
2563 | goto error; | |
2564 | } | |
2565 | ||
2566 | /* File permission MUST be 660 */ | |
2567 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2568 | if (ret < 0) { | |
2569 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
2570 | perror("chmod"); | |
2571 | goto error; | |
2572 | } | |
2573 | ||
2574 | error: | |
2575 | return ret; | |
2576 | } | |
2577 | ||
fac6795d | 2578 | /* |
d063d709 | 2579 | * Signal handler for the daemon |
cf3af59e MD |
2580 | * |
2581 | * Simply stop all worker threads, leaving main() return gracefully | |
2582 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
2583 | */ |
2584 | static void sighandler(int sig) | |
2585 | { | |
2586 | switch (sig) { | |
cf3af59e MD |
2587 | case SIGPIPE: |
2588 | DBG("SIGPIPE catched"); | |
2589 | return; | |
2590 | case SIGINT: | |
2591 | DBG("SIGINT catched"); | |
2592 | stop_threads(); | |
2593 | break; | |
2594 | case SIGTERM: | |
2595 | DBG("SIGTERM catched"); | |
2596 | stop_threads(); | |
2597 | break; | |
2598 | default: | |
2599 | break; | |
fac6795d | 2600 | } |
fac6795d DG |
2601 | } |
2602 | ||
2603 | /* | |
d063d709 | 2604 | * Setup signal handler for : |
1d4b027a | 2605 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 2606 | */ |
1d4b027a | 2607 | static int set_signal_handler(void) |
fac6795d | 2608 | { |
1d4b027a DG |
2609 | int ret = 0; |
2610 | struct sigaction sa; | |
2611 | sigset_t sigset; | |
fac6795d | 2612 | |
1d4b027a DG |
2613 | if ((ret = sigemptyset(&sigset)) < 0) { |
2614 | perror("sigemptyset"); | |
2615 | return ret; | |
2616 | } | |
d6f42150 | 2617 | |
1d4b027a DG |
2618 | sa.sa_handler = sighandler; |
2619 | sa.sa_mask = sigset; | |
2620 | sa.sa_flags = 0; | |
2621 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
2622 | perror("sigaction"); | |
2623 | return ret; | |
d6f42150 DG |
2624 | } |
2625 | ||
1d4b027a DG |
2626 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
2627 | perror("sigaction"); | |
2628 | return ret; | |
d6f42150 | 2629 | } |
aaf26714 | 2630 | |
1d4b027a DG |
2631 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
2632 | perror("sigaction"); | |
2633 | return ret; | |
8c0faa1d DG |
2634 | } |
2635 | ||
1d4b027a DG |
2636 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
2637 | ||
2638 | return ret; | |
fac6795d DG |
2639 | } |
2640 | ||
f3ed775e | 2641 | /* |
d063d709 DG |
2642 | * Set open files limit to unlimited. This daemon can open a large number of |
2643 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
2644 | */ |
2645 | static void set_ulimit(void) | |
2646 | { | |
2647 | int ret; | |
2648 | struct rlimit lim; | |
2649 | ||
a88df331 | 2650 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
2651 | lim.rlim_cur = 65535; |
2652 | lim.rlim_max = 65535; | |
2653 | ||
2654 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
2655 | if (ret < 0) { | |
2656 | perror("failed to set open files limit"); | |
2657 | } | |
2658 | } | |
2659 | ||
fac6795d DG |
2660 | /* |
2661 | * main | |
2662 | */ | |
2663 | int main(int argc, char **argv) | |
2664 | { | |
fac6795d DG |
2665 | int ret = 0; |
2666 | void *status; | |
b082db07 | 2667 | const char *home_path; |
fac6795d | 2668 | |
273ea72c | 2669 | /* Create thread quit pipe */ |
cf3af59e MD |
2670 | if ((ret = init_thread_quit_pipe()) < 0) { |
2671 | goto error; | |
273ea72c DG |
2672 | } |
2673 | ||
fac6795d DG |
2674 | /* Parse arguments */ |
2675 | progname = argv[0]; | |
2676 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 2677 | goto error; |
fac6795d DG |
2678 | } |
2679 | ||
2680 | /* Daemonize */ | |
2681 | if (opt_daemon) { | |
53094c05 DG |
2682 | ret = daemon(0, 0); |
2683 | if (ret < 0) { | |
2684 | perror("daemon"); | |
cf3af59e | 2685 | goto error; |
53094c05 | 2686 | } |
fac6795d DG |
2687 | } |
2688 | ||
2689 | /* Check if daemon is UID = 0 */ | |
2690 | is_root = !getuid(); | |
2691 | ||
fac6795d | 2692 | if (is_root) { |
d6f42150 DG |
2693 | ret = create_lttng_rundir(); |
2694 | if (ret < 0) { | |
cf3af59e | 2695 | goto error; |
d6f42150 DG |
2696 | } |
2697 | ||
fac6795d | 2698 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
2699 | snprintf(apps_unix_sock_path, PATH_MAX, |
2700 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
2701 | } |
2702 | ||
2703 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
2704 | snprintf(client_unix_sock_path, PATH_MAX, |
2705 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
2706 | } | |
fac6795d | 2707 | } else { |
b082db07 DG |
2708 | home_path = get_home_dir(); |
2709 | if (home_path == NULL) { | |
273ea72c DG |
2710 | /* TODO: Add --socket PATH option */ |
2711 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
2712 | ret = -EPERM; |
2713 | goto error; | |
b082db07 DG |
2714 | } |
2715 | ||
fac6795d | 2716 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 2717 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 2718 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
2719 | } |
2720 | ||
2721 | /* Set the cli tool unix socket path */ | |
2722 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 2723 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 2724 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d DG |
2725 | } |
2726 | } | |
2727 | ||
847177cd DG |
2728 | DBG("Client socket path %s", client_unix_sock_path); |
2729 | DBG("Application socket path %s", apps_unix_sock_path); | |
2730 | ||
273ea72c | 2731 | /* |
7d8234d9 | 2732 | * See if daemon already exist. |
fac6795d | 2733 | */ |
7d8234d9 | 2734 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 2735 | ERR("Already running daemon.\n"); |
273ea72c | 2736 | /* |
cf3af59e MD |
2737 | * We do not goto exit because we must not cleanup() |
2738 | * because a daemon is already running. | |
ab118b20 | 2739 | */ |
cf3af59e | 2740 | goto error; |
a88df331 DG |
2741 | } |
2742 | ||
2743 | /* After this point, we can safely call cleanup() so goto error is used */ | |
2744 | ||
2745 | /* | |
2746 | * These actions must be executed as root. We do that *after* setting up | |
2747 | * the sockets path because we MUST make the check for another daemon using | |
2748 | * those paths *before* trying to set the kernel consumer sockets and init | |
2749 | * kernel tracer. | |
2750 | */ | |
2751 | if (is_root) { | |
2752 | ret = set_kconsumerd_sockets(); | |
2753 | if (ret < 0) { | |
cf3af59e | 2754 | goto exit; |
a88df331 DG |
2755 | } |
2756 | ||
2757 | /* Setup kernel tracer */ | |
2758 | init_kernel_tracer(); | |
2759 | ||
2760 | /* Set ulimit for open files */ | |
2761 | set_ulimit(); | |
fac6795d DG |
2762 | } |
2763 | ||
cf3af59e MD |
2764 | if ((ret = set_signal_handler()) < 0) { |
2765 | goto exit; | |
fac6795d DG |
2766 | } |
2767 | ||
d6f42150 | 2768 | /* Setup the needed unix socket */ |
cf3af59e MD |
2769 | if ((ret = init_daemon_socket()) < 0) { |
2770 | goto exit; | |
fac6795d DG |
2771 | } |
2772 | ||
2773 | /* Set credentials to socket */ | |
cf3af59e MD |
2774 | if (is_root && ((ret = set_permissions()) < 0)) { |
2775 | goto exit; | |
fac6795d DG |
2776 | } |
2777 | ||
5b8719f5 DG |
2778 | /* Get parent pid if -S, --sig-parent is specified. */ |
2779 | if (opt_sig_parent) { | |
2780 | ppid = getppid(); | |
2781 | } | |
2782 | ||
7a485870 | 2783 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
2784 | if ((ret = create_kernel_poll_pipe()) < 0) { |
2785 | goto exit; | |
7a485870 DG |
2786 | } |
2787 | ||
273ea72c DG |
2788 | /* |
2789 | * Get session list pointer. This pointer MUST NOT be free(). | |
2790 | * This list is statically declared in session.c | |
2791 | */ | |
b5541356 DG |
2792 | session_list_ptr = get_session_list(); |
2793 | ||
cf3af59e MD |
2794 | /* Create thread to manage the client socket */ |
2795 | ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL); | |
2796 | if (ret != 0) { | |
2797 | perror("pthread_create"); | |
2798 | goto exit_client; | |
2799 | } | |
fac6795d | 2800 | |
cf3af59e MD |
2801 | /* Create thread to manage application socket */ |
2802 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
2803 | if (ret != 0) { | |
2804 | perror("pthread_create"); | |
2805 | goto exit_apps; | |
2806 | } | |
fac6795d | 2807 | |
cf3af59e MD |
2808 | /* Create kernel thread to manage kernel event */ |
2809 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
2810 | if (ret != 0) { | |
2811 | perror("pthread_create"); | |
2812 | goto exit_kernel; | |
2813 | } | |
7a485870 | 2814 | |
cf3af59e MD |
2815 | ret = pthread_join(kernel_thread, &status); |
2816 | if (ret != 0) { | |
2817 | perror("pthread_join"); | |
2818 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
2819 | } |
2820 | ||
cf3af59e MD |
2821 | exit_kernel: |
2822 | ret = pthread_join(apps_thread, &status); | |
2823 | if (ret != 0) { | |
2824 | perror("pthread_join"); | |
2825 | goto error; /* join error, exit without cleanup */ | |
2826 | } | |
fac6795d | 2827 | |
cf3af59e MD |
2828 | exit_apps: |
2829 | ret = pthread_join(client_thread, &status); | |
2830 | if (ret != 0) { | |
2831 | perror("pthread_join"); | |
2832 | goto error; /* join error, exit without cleanup */ | |
2833 | } | |
2834 | ||
2835 | ret = join_kconsumerd_thread(); | |
2836 | if (ret != 0) { | |
2837 | perror("join_kconsumerd"); | |
2838 | goto error; /* join error, exit without cleanup */ | |
2839 | } | |
a88df331 | 2840 | |
cf3af59e | 2841 | exit_client: |
a88df331 | 2842 | exit: |
cf3af59e MD |
2843 | /* |
2844 | * cleanup() is called when no other thread is running. | |
2845 | */ | |
2846 | cleanup(); | |
2847 | if (!ret) | |
2848 | exit(EXIT_SUCCESS); | |
2849 | error: | |
5e16da05 | 2850 | exit(EXIT_FAILURE); |
fac6795d | 2851 | } |