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> |
e88129fc | 44 | #include <lttng-sessiond-comm.h> |
fac6795d | 45 | |
b579acd9 | 46 | #include "context.h" |
fac6795d | 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 | 291 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 292 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
293 | |
294 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
295 | ||
296 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
297 | if (ret < 0) { | |
298 | perror("send kconsumerd fd"); | |
299 | goto error; | |
300 | } | |
301 | } | |
302 | } | |
303 | ||
7a485870 | 304 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
305 | |
306 | return 0; | |
307 | ||
308 | error: | |
309 | return ret; | |
310 | } | |
311 | ||
312 | /* | |
d063d709 | 313 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 314 | */ |
7a485870 | 315 | static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session) |
f3ed775e DG |
316 | { |
317 | int ret; | |
318 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
319 | struct lttcomm_kconsumerd_header lkh; |
320 | struct lttcomm_kconsumerd_msg lkm; | |
321 | ||
322 | /* Setup header */ | |
323 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
324 | lkh.cmd_type = ADD_STREAM; | |
325 | ||
326 | DBG("Sending kconsumerd header for metadata"); | |
327 | ||
328 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
329 | if (ret < 0) { | |
330 | perror("send kconsumerd header"); | |
331 | goto error; | |
332 | } | |
333 | ||
334 | DBG("Sending metadata stream fd"); | |
335 | ||
336 | if (session->metadata_stream_fd != 0) { | |
337 | /* Send metadata stream fd first */ | |
338 | lkm.fd = session->metadata_stream_fd; | |
339 | lkm.state = ACTIVE_FD; | |
340 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
341 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); | |
99497cd0 | 342 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 DG |
343 | |
344 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
345 | if (ret < 0) { | |
346 | perror("send kconsumerd fd"); | |
347 | goto error; | |
348 | } | |
349 | } | |
f3ed775e | 350 | |
f3ed775e | 351 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
7a485870 | 352 | ret = send_kconsumerd_channel_fds(sock, chan); |
f3ed775e | 353 | if (ret < 0) { |
7a485870 | 354 | goto error; |
f3ed775e DG |
355 | } |
356 | } | |
357 | ||
7a485870 DG |
358 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
359 | ||
f3ed775e DG |
360 | return 0; |
361 | ||
362 | error: | |
363 | return ret; | |
364 | } | |
365 | ||
97b1a726 | 366 | #ifdef DISABLED |
fac6795d | 367 | /* |
d063d709 DG |
368 | * Return a socket connected to the libust communication socket of the |
369 | * application identified by the pid. | |
fac6795d | 370 | * |
d063d709 | 371 | * If the pid is not found in the traceable list, return -1 to indicate error. |
fac6795d | 372 | */ |
471d1693 | 373 | static int ust_connect_app(pid_t pid) |
fac6795d | 374 | { |
91d76f53 DG |
375 | int sock; |
376 | struct ltt_traceable_app *lta; | |
379473d2 | 377 | |
e07ae692 DG |
378 | DBG("Connect to application pid %d", pid); |
379 | ||
91d76f53 DG |
380 | lta = find_app_by_pid(pid); |
381 | if (lta == NULL) { | |
382 | /* App not found */ | |
7442b2ba | 383 | DBG("Application pid %d not found", pid); |
379473d2 DG |
384 | return -1; |
385 | } | |
fac6795d | 386 | |
91d76f53 | 387 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 388 | if (sock < 0) { |
62d3069f | 389 | ERR("Fail connecting to the PID %d", pid); |
fac6795d DG |
390 | } |
391 | ||
392 | return sock; | |
393 | } | |
97b1a726 | 394 | #endif /* DISABLED */ |
fac6795d DG |
395 | |
396 | /* | |
d063d709 DG |
397 | * Notify apps by writing 42 to a named pipe using name. Every applications |
398 | * waiting for a ltt-sessiond will be notified and re-register automatically to | |
399 | * the session daemon. | |
fac6795d | 400 | * |
d063d709 | 401 | * Return open or write error value. |
fac6795d DG |
402 | */ |
403 | static int notify_apps(const char *name) | |
404 | { | |
405 | int fd; | |
406 | int ret = -1; | |
407 | ||
e07ae692 DG |
408 | DBG("Notify the global application pipe"); |
409 | ||
fac6795d DG |
410 | /* Try opening the global pipe */ |
411 | fd = open(name, O_WRONLY); | |
412 | if (fd < 0) { | |
413 | goto error; | |
414 | } | |
415 | ||
416 | /* Notify by writing on the pipe */ | |
417 | ret = write(fd, "42", 2); | |
418 | if (ret < 0) { | |
419 | perror("write"); | |
420 | } | |
421 | ||
422 | error: | |
423 | return ret; | |
424 | } | |
425 | ||
e065084a | 426 | /* |
d063d709 DG |
427 | * Setup the outgoing data buffer for the response (llm) by allocating the |
428 | * right amount of memory and copying the original information from the lsm | |
429 | * structure. | |
ca95a216 | 430 | * |
d063d709 | 431 | * Return total size of the buffer pointed by buf. |
ca95a216 | 432 | */ |
5461b305 | 433 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 434 | { |
f3ed775e | 435 | int ret, buf_size; |
ca95a216 | 436 | |
f3ed775e | 437 | buf_size = size; |
5461b305 DG |
438 | |
439 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
440 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 441 | perror("malloc"); |
5461b305 | 442 | ret = -ENOMEM; |
ca95a216 DG |
443 | goto error; |
444 | } | |
445 | ||
5461b305 DG |
446 | /* Copy common data */ |
447 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 448 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 449 | |
5461b305 DG |
450 | cmd_ctx->llm->data_size = size; |
451 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
452 | ||
ca95a216 DG |
453 | return buf_size; |
454 | ||
455 | error: | |
456 | return ret; | |
457 | } | |
458 | ||
7a485870 | 459 | /* |
d063d709 DG |
460 | * Update the kernel pollfd set of all channel fd available over all tracing |
461 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
462 | */ |
463 | static int update_kernel_pollfd(void) | |
464 | { | |
465 | int i = 0; | |
273ea72c DG |
466 | /* |
467 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
468 | * at 2 for those pipes. | |
469 | */ | |
470 | unsigned int nb_fd = 2; | |
7a485870 DG |
471 | struct ltt_session *session; |
472 | struct ltt_kernel_channel *channel; | |
473 | ||
474 | DBG("Updating kernel_pollfd"); | |
475 | ||
476 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 477 | lock_session_list(); |
b5541356 DG |
478 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
479 | lock_session(session); | |
7a485870 | 480 | if (session->kernel_session == NULL) { |
b5541356 | 481 | unlock_session(session); |
7a485870 DG |
482 | continue; |
483 | } | |
484 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 485 | unlock_session(session); |
7a485870 DG |
486 | } |
487 | ||
488 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
489 | ||
490 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
491 | if (kernel_pollfd == NULL) { | |
492 | perror("malloc kernel_pollfd"); | |
493 | goto error; | |
494 | } | |
495 | ||
b5541356 DG |
496 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
497 | lock_session(session); | |
7a485870 | 498 | if (session->kernel_session == NULL) { |
b5541356 | 499 | unlock_session(session); |
7a485870 DG |
500 | continue; |
501 | } | |
502 | if (i >= nb_fd) { | |
503 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 504 | unlock_session(session); |
7a485870 DG |
505 | break; |
506 | } | |
507 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
508 | kernel_pollfd[i].fd = channel->fd; | |
509 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
510 | i++; | |
511 | } | |
b5541356 | 512 | unlock_session(session); |
7a485870 | 513 | } |
6c9cc2ab | 514 | unlock_session_list(); |
7a485870 DG |
515 | |
516 | /* Adding wake up pipe */ | |
273ea72c DG |
517 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
518 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
519 | ||
520 | /* Adding the quit pipe */ | |
521 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
522 | |
523 | return nb_fd; | |
524 | ||
525 | error: | |
6c9cc2ab | 526 | unlock_session_list(); |
7a485870 DG |
527 | return -1; |
528 | } | |
529 | ||
530 | /* | |
d063d709 DG |
531 | * Find the channel fd from 'fd' over all tracing session. When found, check |
532 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 533 | * |
d063d709 | 534 | * Useful for CPU hotplug feature. |
7a485870 DG |
535 | */ |
536 | static int update_kernel_stream(int fd) | |
537 | { | |
538 | int ret = 0; | |
539 | struct ltt_session *session; | |
540 | struct ltt_kernel_channel *channel; | |
541 | ||
542 | DBG("Updating kernel streams for channel fd %d", fd); | |
543 | ||
6c9cc2ab | 544 | lock_session_list(); |
b5541356 DG |
545 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
546 | lock_session(session); | |
7a485870 | 547 | if (session->kernel_session == NULL) { |
b5541356 | 548 | unlock_session(session); |
7a485870 DG |
549 | continue; |
550 | } | |
551 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
552 | if (channel->fd == fd) { | |
553 | DBG("Channel found, updating kernel streams"); | |
554 | ret = kernel_open_channel_stream(channel); | |
555 | if (ret < 0) { | |
556 | goto end; | |
557 | } | |
558 | /* | |
559 | * Have we already sent fds to the consumer? If yes, it means that | |
560 | * tracing is started so it is safe to send our updated stream fds. | |
561 | */ | |
562 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
563 | ret = send_kconsumerd_channel_fds(kconsumerd_cmd_sock, channel); | |
564 | if (ret < 0) { | |
565 | goto end; | |
566 | } | |
567 | } | |
568 | goto end; | |
569 | } | |
570 | } | |
b5541356 | 571 | unlock_session(session); |
7a485870 DG |
572 | } |
573 | ||
574 | end: | |
6c9cc2ab | 575 | unlock_session_list(); |
b5541356 DG |
576 | if (session) { |
577 | unlock_session(session); | |
578 | } | |
7a485870 DG |
579 | return ret; |
580 | } | |
581 | ||
582 | /* | |
d063d709 | 583 | * This thread manage event coming from the kernel. |
7a485870 | 584 | * |
d063d709 DG |
585 | * Features supported in this thread: |
586 | * -) CPU Hotplug | |
7a485870 DG |
587 | */ |
588 | static void *thread_manage_kernel(void *data) | |
589 | { | |
590 | int ret, i, nb_fd = 0; | |
591 | char tmp; | |
592 | int update_poll_flag = 1; | |
593 | ||
594 | DBG("Thread manage kernel started"); | |
595 | ||
596 | while (1) { | |
597 | if (update_poll_flag == 1) { | |
598 | nb_fd = update_kernel_pollfd(); | |
599 | if (nb_fd < 0) { | |
600 | goto error; | |
601 | } | |
602 | update_poll_flag = 0; | |
603 | } | |
604 | ||
605 | DBG("Polling on %d fds", nb_fd); | |
606 | ||
607 | /* Poll infinite value of time */ | |
608 | ret = poll(kernel_pollfd, nb_fd, -1); | |
609 | if (ret < 0) { | |
610 | perror("poll kernel thread"); | |
611 | goto error; | |
612 | } else if (ret == 0) { | |
613 | /* Should not happen since timeout is infinite */ | |
614 | continue; | |
615 | } | |
616 | ||
273ea72c DG |
617 | /* Thread quit pipe has been closed. Killing thread. */ |
618 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
619 | goto error; | |
620 | } | |
621 | ||
7a485870 DG |
622 | DBG("Kernel poll event triggered"); |
623 | ||
624 | /* | |
625 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
626 | * must be updated. | |
627 | */ | |
273ea72c | 628 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 629 | case POLLIN: |
7a485870 DG |
630 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
631 | update_poll_flag = 1; | |
632 | continue; | |
b5541356 DG |
633 | case POLLERR: |
634 | goto error; | |
635 | default: | |
636 | break; | |
7a485870 DG |
637 | } |
638 | ||
639 | for (i = 0; i < nb_fd; i++) { | |
640 | switch (kernel_pollfd[i].revents) { | |
641 | /* | |
642 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
643 | * session and updating the kernel consumer | |
644 | */ | |
645 | case POLLIN | POLLRDNORM: | |
646 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
647 | if (ret < 0) { | |
648 | continue; | |
649 | } | |
650 | break; | |
651 | } | |
652 | } | |
653 | } | |
654 | ||
655 | error: | |
656 | DBG("Kernel thread dying"); | |
657 | if (kernel_pollfd) { | |
658 | free(kernel_pollfd); | |
659 | } | |
273ea72c DG |
660 | |
661 | close(kernel_poll_pipe[0]); | |
662 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
663 | return NULL; |
664 | } | |
665 | ||
1d4b027a | 666 | /* |
d063d709 | 667 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
668 | */ |
669 | static void *thread_manage_kconsumerd(void *data) | |
670 | { | |
273ea72c | 671 | int sock = 0, ret; |
1d4b027a | 672 | enum lttcomm_return_code code; |
273ea72c | 673 | struct pollfd pollfd[2]; |
1d4b027a DG |
674 | |
675 | DBG("[thread] Manage kconsumerd started"); | |
676 | ||
677 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
678 | if (ret < 0) { | |
679 | goto error; | |
680 | } | |
681 | ||
273ea72c DG |
682 | /* First fd is always the quit pipe */ |
683 | pollfd[0].fd = thread_quit_pipe[0]; | |
684 | ||
685 | /* Apps socket */ | |
686 | pollfd[1].fd = kconsumerd_err_sock; | |
687 | pollfd[1].events = POLLIN; | |
688 | ||
689 | /* Inifinite blocking call, waiting for transmission */ | |
690 | ret = poll(pollfd, 2, -1); | |
691 | if (ret < 0) { | |
692 | perror("poll kconsumerd thread"); | |
693 | goto error; | |
694 | } | |
695 | ||
696 | /* Thread quit pipe has been closed. Killing thread. */ | |
697 | if (pollfd[0].revents == POLLNVAL) { | |
698 | goto error; | |
699 | } else if (pollfd[1].revents == POLLERR) { | |
700 | ERR("Kconsumerd err socket poll error"); | |
701 | goto error; | |
702 | } | |
703 | ||
1d4b027a DG |
704 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
705 | if (sock < 0) { | |
706 | goto error; | |
707 | } | |
708 | ||
712ea556 | 709 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
710 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
711 | if (ret <= 0) { | |
712 | goto error; | |
713 | } | |
714 | ||
715 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
716 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
717 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 718 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
719 | perror("kconsumerd connect"); |
720 | goto error; | |
721 | } | |
722 | /* Signal condition to tell that the kconsumerd is ready */ | |
723 | sem_post(&kconsumerd_sem); | |
724 | DBG("Kconsumerd command socket ready"); | |
725 | } else { | |
6f61d021 | 726 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
727 | lttcomm_get_readable_code(-code)); |
728 | goto error; | |
729 | } | |
730 | ||
712ea556 DG |
731 | /* Wait for any kconsumerd error */ |
732 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
733 | if (ret <= 0) { | |
734 | ERR("Kconsumerd closed the command socket"); | |
735 | goto error; | |
6f61d021 | 736 | } |
1d4b027a | 737 | |
712ea556 DG |
738 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
739 | ||
1d4b027a | 740 | error: |
6f61d021 | 741 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
742 | if (kconsumerd_err_sock) { |
743 | close(kconsumerd_err_sock); | |
744 | } | |
745 | if (kconsumerd_cmd_sock) { | |
746 | close(kconsumerd_cmd_sock); | |
747 | } | |
748 | if (sock) { | |
749 | close(sock); | |
750 | } | |
751 | ||
752 | unlink(kconsumerd_err_unix_sock_path); | |
753 | unlink(kconsumerd_cmd_unix_sock_path); | |
754 | ||
755 | kconsumerd_pid = 0; | |
1d4b027a DG |
756 | return NULL; |
757 | } | |
758 | ||
759 | /* | |
1d4b027a DG |
760 | * This thread manage the application socket communication |
761 | */ | |
762 | static void *thread_manage_apps(void *data) | |
763 | { | |
273ea72c DG |
764 | int sock = 0, ret; |
765 | struct pollfd pollfd[2]; | |
1d4b027a DG |
766 | |
767 | /* TODO: Something more elegant is needed but fine for now */ | |
768 | /* FIXME: change all types to either uint8_t, uint32_t, uint64_t | |
769 | * for 32-bit vs 64-bit compat processes. */ | |
770 | /* replicate in ust with version number */ | |
771 | struct { | |
772 | int reg; /* 1:register, 0:unregister */ | |
773 | pid_t pid; | |
774 | uid_t uid; | |
775 | } reg_msg; | |
776 | ||
777 | DBG("[thread] Manage apps started"); | |
778 | ||
779 | ret = lttcomm_listen_unix_sock(apps_sock); | |
780 | if (ret < 0) { | |
781 | goto error; | |
782 | } | |
783 | ||
273ea72c DG |
784 | /* First fd is always the quit pipe */ |
785 | pollfd[0].fd = thread_quit_pipe[0]; | |
786 | ||
787 | /* Apps socket */ | |
788 | pollfd[1].fd = apps_sock; | |
789 | pollfd[1].events = POLLIN; | |
790 | ||
1d4b027a DG |
791 | /* Notify all applications to register */ |
792 | notify_apps(default_global_apps_pipe); | |
793 | ||
794 | while (1) { | |
795 | DBG("Accepting application registration"); | |
273ea72c DG |
796 | |
797 | /* Inifinite blocking call, waiting for transmission */ | |
798 | ret = poll(pollfd, 2, -1); | |
799 | if (ret < 0) { | |
800 | perror("poll apps thread"); | |
801 | goto error; | |
802 | } | |
803 | ||
804 | /* Thread quit pipe has been closed. Killing thread. */ | |
805 | if (pollfd[0].revents == POLLNVAL) { | |
806 | goto error; | |
807 | } else if (pollfd[1].revents == POLLERR) { | |
808 | ERR("Apps socket poll error"); | |
809 | goto error; | |
810 | } | |
811 | ||
1d4b027a DG |
812 | sock = lttcomm_accept_unix_sock(apps_sock); |
813 | if (sock < 0) { | |
814 | goto error; | |
815 | } | |
816 | ||
273ea72c DG |
817 | /* |
818 | * Basic recv here to handle the very simple data | |
1d4b027a DG |
819 | * that the libust send to register (reg_msg). |
820 | */ | |
821 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
822 | if (ret < 0) { | |
823 | perror("recv"); | |
824 | continue; | |
825 | } | |
826 | ||
827 | /* Add application to the global traceable list */ | |
828 | if (reg_msg.reg == 1) { | |
829 | /* Registering */ | |
830 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); | |
831 | if (ret < 0) { | |
832 | /* register_traceable_app only return an error with | |
833 | * ENOMEM. At this point, we better stop everything. | |
834 | */ | |
835 | goto error; | |
836 | } | |
837 | } else { | |
838 | /* Unregistering */ | |
839 | unregister_traceable_app(reg_msg.pid); | |
840 | } | |
841 | } | |
842 | ||
843 | error: | |
273ea72c DG |
844 | DBG("Apps thread dying"); |
845 | if (apps_sock) { | |
846 | close(apps_sock); | |
847 | } | |
848 | if (sock) { | |
849 | close(sock); | |
850 | } | |
1d4b027a | 851 | |
273ea72c | 852 | unlink(apps_unix_sock_path); |
1d4b027a DG |
853 | return NULL; |
854 | } | |
855 | ||
8c0faa1d | 856 | /* |
d063d709 DG |
857 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
858 | * exec or it will fails. | |
8c0faa1d | 859 | */ |
693bd40b | 860 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
861 | { |
862 | int ret; | |
863 | ||
864 | /* Setup semaphore */ | |
865 | sem_init(&kconsumerd_sem, 0, 0); | |
866 | ||
1d4b027a | 867 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
868 | if (ret != 0) { |
869 | perror("pthread_create kconsumerd"); | |
870 | goto error; | |
871 | } | |
872 | ||
693bd40b | 873 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
874 | sem_wait(&kconsumerd_sem); |
875 | ||
712ea556 DG |
876 | if (kconsumerd_pid == 0) { |
877 | ERR("Kconsumerd did not start"); | |
878 | goto error; | |
879 | } | |
880 | ||
8c0faa1d DG |
881 | return 0; |
882 | ||
883 | error: | |
712ea556 | 884 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
885 | return ret; |
886 | } | |
887 | ||
cf3af59e MD |
888 | static int join_kconsumerd_thread(void) |
889 | { | |
890 | void *status; | |
891 | int ret; | |
892 | ||
893 | if (kconsumerd_pid != 0) { | |
894 | ret = kill(kconsumerd_pid, SIGTERM); | |
895 | if (ret) { | |
896 | ERR("Error killing kconsumerd"); | |
897 | return ret; | |
898 | } | |
899 | return pthread_join(kconsumerd_thread, &status); | |
900 | } else { | |
901 | return 0; | |
902 | } | |
903 | } | |
904 | ||
8c0faa1d | 905 | /* |
d063d709 | 906 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 907 | * |
d063d709 | 908 | * Return pid if successful else -1. |
8c0faa1d | 909 | */ |
693bd40b | 910 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
911 | { |
912 | int ret; | |
913 | pid_t pid; | |
53086306 | 914 | const char *verbosity; |
8c0faa1d | 915 | |
c49dc785 DG |
916 | DBG("Spawning kconsumerd"); |
917 | ||
8c0faa1d DG |
918 | pid = fork(); |
919 | if (pid == 0) { | |
920 | /* | |
921 | * Exec kconsumerd. | |
922 | */ | |
31f73cc9 | 923 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
924 | verbosity = "--verbose"; |
925 | } else { | |
926 | verbosity = "--quiet"; | |
927 | } | |
928 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
929 | if (errno != 0) { |
930 | perror("kernel start consumer exec"); | |
931 | } | |
932 | exit(EXIT_FAILURE); | |
933 | } else if (pid > 0) { | |
934 | ret = pid; | |
935 | goto error; | |
936 | } else { | |
937 | perror("kernel start consumer fork"); | |
938 | ret = -errno; | |
939 | goto error; | |
940 | } | |
941 | ||
942 | error: | |
943 | return ret; | |
944 | } | |
945 | ||
693bd40b | 946 | /* |
d063d709 | 947 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
948 | */ |
949 | static int start_kconsumerd(void) | |
950 | { | |
951 | int ret; | |
952 | ||
693bd40b | 953 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 954 | if (kconsumerd_pid != 0) { |
817153bb | 955 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
956 | goto end; |
957 | } | |
693bd40b | 958 | |
c49dc785 DG |
959 | ret = spawn_kconsumerd(); |
960 | if (ret < 0) { | |
961 | ERR("Spawning kconsumerd failed"); | |
962 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
963 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
964 | goto error; | |
693bd40b | 965 | } |
c49dc785 DG |
966 | |
967 | /* Setting up the global kconsumerd_pid */ | |
968 | kconsumerd_pid = ret; | |
693bd40b DG |
969 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
970 | ||
6f61d021 DG |
971 | DBG("Kconsumerd pid %d", ret); |
972 | ||
693bd40b | 973 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
974 | ret = spawn_kconsumerd_thread(); |
975 | if (ret < 0) { | |
976 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
977 | goto error; |
978 | } | |
979 | ||
c49dc785 | 980 | end: |
693bd40b DG |
981 | return 0; |
982 | ||
983 | error: | |
984 | return ret; | |
985 | } | |
986 | ||
b73401da | 987 | /* |
d063d709 | 988 | * modprobe_kernel_modules |
b73401da DG |
989 | */ |
990 | static int modprobe_kernel_modules(void) | |
991 | { | |
ab147185 | 992 | int ret = 0, i; |
b73401da DG |
993 | char modprobe[256]; |
994 | ||
ab147185 MD |
995 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
996 | ret = snprintf(modprobe, sizeof(modprobe), | |
997 | "/sbin/modprobe %s%s", | |
998 | kernel_modules_list[i].required ? "" : "--quiet ", | |
999 | kernel_modules_list[i].name); | |
b73401da DG |
1000 | if (ret < 0) { |
1001 | perror("snprintf modprobe"); | |
1002 | goto error; | |
1003 | } | |
ab147185 | 1004 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1005 | ret = system(modprobe); |
ab147185 MD |
1006 | if (ret == -1) { |
1007 | ERR("Unable to launch modprobe for module %s", | |
1008 | kernel_modules_list[i].name); | |
1009 | } else if (kernel_modules_list[i].required | |
1010 | && WEXITSTATUS(ret) != 0) { | |
1011 | ERR("Unable to load module %s", | |
1012 | kernel_modules_list[i].name); | |
1013 | } else { | |
1014 | DBG("Modprobe successfully %s", | |
1015 | kernel_modules_list[i].name); | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | error: | |
1020 | return ret; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * modprobe_remove_kernel_modules | |
1025 | * Remove modules in reverse load order. | |
1026 | */ | |
1027 | static int modprobe_remove_kernel_modules(void) | |
1028 | { | |
1029 | int ret = 0, i; | |
1030 | char modprobe[256]; | |
1031 | ||
1032 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
1033 | ret = snprintf(modprobe, sizeof(modprobe), | |
1034 | "/sbin/modprobe --remove --quiet %s", | |
1035 | kernel_modules_list[i].name); | |
b73401da | 1036 | if (ret < 0) { |
ab147185 MD |
1037 | perror("snprintf modprobe --remove"); |
1038 | goto error; | |
1039 | } | |
1040 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
1041 | ret = system(modprobe); | |
1042 | if (ret == -1) { | |
1043 | ERR("Unable to launch modprobe --remove for module %s", | |
1044 | kernel_modules_list[i].name); | |
1045 | } else if (kernel_modules_list[i].required | |
1046 | && WEXITSTATUS(ret) != 0) { | |
1047 | ERR("Unable to remove module %s", | |
1048 | kernel_modules_list[i].name); | |
1049 | } else { | |
1050 | DBG("Modprobe removal successful %s", | |
1051 | kernel_modules_list[i].name); | |
b73401da | 1052 | } |
b73401da DG |
1053 | } |
1054 | ||
1055 | error: | |
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | /* | |
d063d709 | 1060 | * mount_debugfs |
b73401da DG |
1061 | */ |
1062 | static int mount_debugfs(char *path) | |
1063 | { | |
1064 | int ret; | |
1065 | char *type = "debugfs"; | |
1066 | ||
996b65c8 | 1067 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1068 | if (ret < 0) { |
1069 | goto error; | |
1070 | } | |
1071 | ||
1072 | ret = mount(type, path, type, 0, NULL); | |
1073 | if (ret < 0) { | |
1074 | perror("mount debugfs"); | |
1075 | goto error; | |
1076 | } | |
1077 | ||
1078 | DBG("Mounted debugfs successfully at %s", path); | |
1079 | ||
1080 | error: | |
1081 | return ret; | |
1082 | } | |
1083 | ||
8c0faa1d | 1084 | /* |
d063d709 | 1085 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1086 | */ |
f3ed775e | 1087 | static void init_kernel_tracer(void) |
8c0faa1d | 1088 | { |
b73401da DG |
1089 | int ret; |
1090 | char *proc_mounts = "/proc/mounts"; | |
1091 | char line[256]; | |
1092 | char *debugfs_path = NULL, *lttng_path; | |
1093 | FILE *fp; | |
1094 | ||
1095 | /* Detect debugfs */ | |
1096 | fp = fopen(proc_mounts, "r"); | |
1097 | if (fp == NULL) { | |
1098 | ERR("Unable to probe %s", proc_mounts); | |
1099 | goto error; | |
1100 | } | |
1101 | ||
1102 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1103 | if (strstr(line, "debugfs") != NULL) { | |
1104 | /* Remove first string */ | |
1105 | strtok(line, " "); | |
1106 | /* Dup string here so we can reuse line later on */ | |
1107 | debugfs_path = strdup(strtok(NULL, " ")); | |
1108 | DBG("Got debugfs path : %s", debugfs_path); | |
1109 | break; | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | fclose(fp); | |
1114 | ||
1115 | /* Mount debugfs if needded */ | |
1116 | if (debugfs_path == NULL) { | |
1117 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1118 | if (ret < 0) { | |
1119 | perror("asprintf debugfs path"); | |
1120 | goto error; | |
1121 | } | |
1122 | ret = mount_debugfs(debugfs_path); | |
1123 | if (ret < 0) { | |
1124 | goto error; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | /* Modprobe lttng kernel modules */ | |
1129 | ret = modprobe_kernel_modules(); | |
1130 | if (ret < 0) { | |
1131 | goto error; | |
1132 | } | |
1133 | ||
1134 | /* Setup lttng kernel path */ | |
1135 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1136 | if (ret < 0) { | |
1137 | perror("asprintf lttng path"); | |
1138 | goto error; | |
1139 | } | |
1140 | ||
1141 | /* Open debugfs lttng */ | |
1142 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1143 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1144 | DBG("Failed to open %s", lttng_path); |
1145 | goto error; | |
8c0faa1d DG |
1146 | } |
1147 | ||
b73401da DG |
1148 | free(lttng_path); |
1149 | free(debugfs_path); | |
f3ed775e | 1150 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1151 | return; |
1152 | ||
1153 | error: | |
1154 | if (lttng_path) { | |
1155 | free(lttng_path); | |
1156 | } | |
1157 | if (debugfs_path) { | |
1158 | free(debugfs_path); | |
1159 | } | |
1160 | WARN("No kernel tracer available"); | |
1161 | kernel_tracer_fd = 0; | |
1162 | return; | |
f3ed775e | 1163 | } |
33a2b854 | 1164 | |
f3ed775e | 1165 | /* |
d063d709 DG |
1166 | * Start tracing by creating trace directory and sending FDs to the kernel |
1167 | * consumer. | |
f3ed775e DG |
1168 | */ |
1169 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1170 | { | |
f40799e8 | 1171 | int ret = 0; |
8c0faa1d | 1172 | |
f3ed775e DG |
1173 | if (session->kconsumer_fds_sent == 0) { |
1174 | ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session); | |
1175 | if (ret < 0) { | |
1176 | ERR("Send kconsumerd fds failed"); | |
1177 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1178 | goto error; | |
1179 | } | |
1d4b027a | 1180 | |
f3ed775e DG |
1181 | session->kconsumer_fds_sent = 1; |
1182 | } | |
1d4b027a DG |
1183 | |
1184 | error: | |
1185 | return ret; | |
8c0faa1d DG |
1186 | } |
1187 | ||
7a485870 DG |
1188 | /* |
1189 | * Notify kernel thread to update it's pollfd. | |
1190 | */ | |
1191 | static int notify_kernel_pollfd(void) | |
1192 | { | |
1193 | int ret; | |
1194 | ||
1195 | /* Inform kernel thread of the new kernel channel */ | |
1196 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1197 | if (ret < 0) { | |
1198 | perror("write kernel poll pipe"); | |
1199 | } | |
1200 | ||
1201 | return ret; | |
1202 | } | |
1203 | ||
8c0faa1d | 1204 | /* |
d063d709 | 1205 | * Allocate a channel structure and fill it. |
8c0faa1d | 1206 | */ |
ed8f384d | 1207 | static struct lttng_channel *init_default_channel(char *name) |
8c0faa1d | 1208 | { |
f3ed775e | 1209 | struct lttng_channel *chan; |
1d4b027a | 1210 | |
f3ed775e DG |
1211 | chan = malloc(sizeof(struct lttng_channel)); |
1212 | if (chan == NULL) { | |
1213 | perror("init channel malloc"); | |
1214 | goto error; | |
8c0faa1d | 1215 | } |
1d4b027a | 1216 | |
ed8f384d | 1217 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1218 | perror("snprintf channel name"); |
f3ed775e DG |
1219 | return NULL; |
1220 | } | |
1221 | ||
1222 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1223 | chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; | |
1224 | chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; | |
1225 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
1226 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
7d452e12 | 1227 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
1d4b027a DG |
1228 | |
1229 | error: | |
f3ed775e | 1230 | return chan; |
8c0faa1d DG |
1231 | } |
1232 | ||
333f285e | 1233 | /* |
d063d709 | 1234 | * Create a kernel tracer session then create the default channel. |
333f285e | 1235 | */ |
f3ed775e | 1236 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1237 | { |
f3ed775e | 1238 | int ret; |
f3ed775e DG |
1239 | |
1240 | DBG("Creating kernel session"); | |
1241 | ||
1242 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1243 | if (ret < 0) { | |
1244 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1245 | goto error; | |
333f285e DG |
1246 | } |
1247 | ||
63053e7c DG |
1248 | ret = asprintf(&session->kernel_session->trace_path, "%s/kernel", |
1249 | session->path); | |
1250 | if (ret < 0) { | |
1251 | perror("asprintf kernel traces path"); | |
1252 | goto error; | |
1253 | } | |
1254 | ||
1255 | ret = mkdir_recursive(session->kernel_session->trace_path, | |
1256 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1257 | if (ret < 0) { |
996b65c8 | 1258 | if (ret != -EEXIST) { |
7a485870 DG |
1259 | ERR("Trace directory creation error"); |
1260 | goto error; | |
1261 | } | |
1262 | } | |
1263 | ||
f3ed775e DG |
1264 | error: |
1265 | return ret; | |
333f285e DG |
1266 | } |
1267 | ||
6c9cc2ab DG |
1268 | /* |
1269 | * Using the session list, filled a lttng_session array to send back to the | |
1270 | * client for session listing. | |
1271 | * | |
1272 | * The session list lock MUST be acquired before calling this function. Use | |
1273 | * lock_session_list() and unlock_session_list(). | |
1274 | */ | |
1275 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1276 | { | |
1277 | int i = 0; | |
1278 | struct ltt_session *session; | |
1279 | ||
1280 | DBG("Getting all available session"); | |
1281 | /* | |
1282 | * Iterate over session list and append data after the control struct in | |
1283 | * the buffer. | |
1284 | */ | |
1285 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1286 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1287 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1288 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1289 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1290 | i++; |
1291 | } | |
1292 | } | |
1293 | ||
9f19cc17 DG |
1294 | /* |
1295 | * Fill lttng_channel array of all channels. | |
1296 | */ | |
1297 | static void list_lttng_channels(struct ltt_session *session, | |
1298 | struct lttng_channel *channels) | |
1299 | { | |
1300 | int i = 0; | |
1301 | struct ltt_kernel_channel *kchan; | |
1302 | ||
1303 | DBG("Listing channels for session %s", session->name); | |
1304 | ||
1305 | /* Kernel channels */ | |
1306 | if (session->kernel_session != NULL) { | |
1307 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1308 | /* Copy lttng_channel struct to array */ | |
1309 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1310 | channels[i].enabled = kchan->enabled; | |
1311 | i++; | |
1312 | } | |
1313 | } | |
1314 | ||
1315 | /* TODO: Missing UST listing */ | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Fill lttng_event array of all events in the channel. | |
1320 | */ | |
1321 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1322 | struct lttng_event *events) | |
1323 | { | |
1324 | /* | |
1325 | * TODO: This is ONLY kernel. Need UST support. | |
1326 | */ | |
1327 | int i = 0; | |
1328 | struct ltt_kernel_event *event; | |
1329 | ||
1330 | DBG("Listing events for channel %s", kchan->channel->name); | |
1331 | ||
1332 | /* Kernel channels */ | |
1333 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1334 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1335 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1336 | events[i].enabled = event->enabled; |
1337 | switch (event->event->instrumentation) { | |
1338 | case LTTNG_KERNEL_TRACEPOINT: | |
1339 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1340 | break; | |
1341 | case LTTNG_KERNEL_KPROBE: | |
1342 | case LTTNG_KERNEL_KRETPROBE: | |
1343 | events[i].type = LTTNG_EVENT_PROBE; | |
1344 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1345 | sizeof(struct lttng_kernel_kprobe)); | |
1346 | break; | |
1347 | case LTTNG_KERNEL_FUNCTION: | |
1348 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1349 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1350 | sizeof(struct lttng_kernel_function)); | |
1351 | break; | |
1352 | } | |
1353 | i++; | |
1354 | } | |
1355 | } | |
1356 | ||
fac6795d | 1357 | /* |
d063d709 DG |
1358 | * Process the command requested by the lttng client within the command |
1359 | * context structure. This function make sure that the return structure (llm) | |
1360 | * is set and ready for transmission before returning. | |
fac6795d | 1361 | * |
e065084a | 1362 | * Return any error encountered or 0 for success. |
fac6795d | 1363 | */ |
5461b305 | 1364 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1365 | { |
f40799e8 | 1366 | int ret = LTTCOMM_OK; |
fac6795d | 1367 | |
5461b305 | 1368 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1369 | |
63053e7c DG |
1370 | /* |
1371 | * Commands that DO NOT need a session. | |
1372 | */ | |
5461b305 | 1373 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1374 | case LTTNG_CREATE_SESSION: |
1375 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1376 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1377 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1378 | break; |
1379 | default: | |
42abccdb DG |
1380 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1381 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1382 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1383 | /* If session name not found */ |
42abccdb | 1384 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1385 | ret = LTTCOMM_SESS_NOT_FOUND; |
1386 | } else { /* If no session name specified */ | |
1387 | ret = LTTCOMM_SELECT_SESS; | |
1388 | } | |
5461b305 | 1389 | goto error; |
b5541356 DG |
1390 | } else { |
1391 | /* Acquire lock for the session */ | |
1392 | lock_session(cmd_ctx->session); | |
379473d2 | 1393 | } |
5e16da05 | 1394 | break; |
379473d2 DG |
1395 | } |
1396 | ||
f3ed775e | 1397 | /* |
d0254c7c | 1398 | * Check domain type for specific "pre-action". |
f3ed775e | 1399 | */ |
0d0c377a DG |
1400 | switch (cmd_ctx->lsm->domain.type) { |
1401 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1402 | /* Kernel tracer check */ |
20fe2104 | 1403 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1404 | init_kernel_tracer(); |
1405 | if (kernel_tracer_fd == 0) { | |
1406 | ret = LTTCOMM_KERN_NA; | |
1407 | goto error; | |
1408 | } | |
20fe2104 | 1409 | } |
f3ed775e DG |
1410 | |
1411 | /* Need a session for kernel command */ | |
d0254c7c MD |
1412 | switch (cmd_ctx->lsm->cmd_type) { |
1413 | case LTTNG_CREATE_SESSION: | |
1414 | case LTTNG_LIST_SESSIONS: | |
1415 | case LTTNG_LIST_TRACEPOINTS: | |
1416 | case LTTNG_CALIBRATE: | |
1417 | break; | |
1418 | default: | |
1419 | if (cmd_ctx->session->kernel_session == NULL) { | |
1420 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1421 | if (ret < 0) { |
d0254c7c | 1422 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1423 | goto error; |
1424 | } | |
d0254c7c MD |
1425 | |
1426 | /* Start the kernel consumer daemon */ | |
1427 | if (kconsumerd_pid == 0) { | |
1428 | ret = start_kconsumerd(); | |
1429 | if (ret < 0) { | |
1430 | goto error; | |
1431 | } | |
1432 | } | |
f3ed775e DG |
1433 | } |
1434 | } | |
0d0c377a DG |
1435 | break; |
1436 | default: | |
1437 | break; | |
20fe2104 DG |
1438 | } |
1439 | ||
fac6795d | 1440 | /* Process by command type */ |
5461b305 | 1441 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1442 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1443 | { |
b579acd9 | 1444 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1445 | |
1446 | /* Setup lttng message with no payload */ | |
1447 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1448 | if (ret < 0) { | |
1449 | goto setup_error; | |
1450 | } | |
1451 | ||
b579acd9 DG |
1452 | switch (cmd_ctx->lsm->domain.type) { |
1453 | case LTTNG_DOMAIN_KERNEL: | |
1454 | /* Create Kernel context */ | |
1455 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1456 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1457 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1458 | strncpy(kctx.u.perf_counter.name, | |
1459 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1460 | LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1461 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
b579acd9 DG |
1462 | |
1463 | /* Add kernel context to kernel tracer. See context.c */ | |
1464 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1465 | cmd_ctx->lsm->u.context.event_name, | |
1466 | cmd_ctx->lsm->u.context.channel_name); | |
1467 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1468 | goto error; |
1469 | } | |
b579acd9 DG |
1470 | break; |
1471 | default: | |
1472 | /* TODO: Userspace tracing */ | |
1473 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1474 | goto error; |
d65106b1 DG |
1475 | } |
1476 | ||
1477 | ret = LTTCOMM_OK; | |
1478 | break; | |
1479 | } | |
0b97ec54 | 1480 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1481 | { |
0b97ec54 | 1482 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1483 | |
1484 | /* Setup lttng message with no payload */ | |
1485 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1486 | if (ret < 0) { | |
1487 | goto setup_error; | |
1488 | } | |
1489 | ||
0b97ec54 DG |
1490 | switch (cmd_ctx->lsm->domain.type) { |
1491 | case LTTNG_DOMAIN_KERNEL: | |
1492 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1493 | cmd_ctx->session->kernel_session); | |
1494 | if (kchan == NULL) { | |
1495 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1496 | goto error; |
0b97ec54 DG |
1497 | } else if (kchan->enabled == 1) { |
1498 | ret = kernel_disable_channel(kchan); | |
1499 | if (ret < 0) { | |
1500 | if (ret != EEXIST) { | |
1501 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1502 | } | |
1503 | goto error; | |
1504 | } | |
26cc6b4e | 1505 | } |
0b97ec54 DG |
1506 | kernel_wait_quiescent(kernel_tracer_fd); |
1507 | break; | |
1508 | default: | |
1509 | /* TODO: Userspace tracing */ | |
1510 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1511 | goto error; | |
26cc6b4e DG |
1512 | } |
1513 | ||
26cc6b4e DG |
1514 | ret = LTTCOMM_OK; |
1515 | break; | |
1516 | } | |
f5177a38 | 1517 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1518 | { |
f5177a38 DG |
1519 | struct ltt_kernel_channel *kchan; |
1520 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1521 | |
1522 | /* Setup lttng message with no payload */ | |
1523 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1524 | if (ret < 0) { | |
1525 | goto setup_error; | |
1526 | } | |
1527 | ||
f5177a38 DG |
1528 | switch (cmd_ctx->lsm->domain.type) { |
1529 | case LTTNG_DOMAIN_KERNEL: | |
1530 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1531 | cmd_ctx->session->kernel_session); | |
1532 | if (kchan == NULL) { | |
1533 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1534 | goto error; |
e953ef25 | 1535 | } |
f5177a38 DG |
1536 | |
1537 | kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); | |
1538 | if (kevent != NULL) { | |
1539 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1540 | kchan->channel->name); | |
1541 | ret = kernel_disable_event(kevent); | |
1542 | if (ret < 0) { | |
1543 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1544 | goto error; | |
1545 | } | |
1546 | } | |
1547 | ||
1548 | kernel_wait_quiescent(kernel_tracer_fd); | |
1549 | break; | |
1550 | default: | |
1551 | /* TODO: Userspace tracing */ | |
1552 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1553 | goto error; | |
e953ef25 DG |
1554 | } |
1555 | ||
19e70852 | 1556 | ret = LTTCOMM_OK; |
e953ef25 DG |
1557 | break; |
1558 | } | |
f5177a38 | 1559 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1560 | { |
f5177a38 DG |
1561 | struct ltt_kernel_channel *kchan; |
1562 | struct ltt_kernel_event *kevent; | |
950131af DG |
1563 | |
1564 | /* Setup lttng message with no payload */ | |
1565 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1566 | if (ret < 0) { | |
1567 | goto setup_error; | |
1568 | } | |
1569 | ||
f5177a38 DG |
1570 | switch (cmd_ctx->lsm->domain.type) { |
1571 | case LTTNG_DOMAIN_KERNEL: | |
1572 | DBG("Disabling all enabled kernel events"); | |
1573 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1574 | cmd_ctx->session->kernel_session); | |
1575 | if (kchan == NULL) { | |
1576 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1577 | goto error; | |
1578 | } | |
950131af | 1579 | |
f5177a38 DG |
1580 | /* For each event in the kernel session */ |
1581 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1582 | DBG("Disabling kernel event %s for channel %s.", | |
1583 | kevent->event->name, kchan->channel->name); | |
1584 | ret = kernel_disable_event(kevent); | |
1585 | if (ret < 0) { | |
1586 | continue; | |
1587 | } | |
950131af | 1588 | } |
f5177a38 DG |
1589 | |
1590 | /* Quiescent wait after event disable */ | |
1591 | kernel_wait_quiescent(kernel_tracer_fd); | |
1592 | break; | |
1593 | default: | |
1594 | /* TODO: Userspace tracing */ | |
1595 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1596 | goto error; | |
950131af DG |
1597 | } |
1598 | ||
950131af DG |
1599 | ret = LTTCOMM_OK; |
1600 | break; | |
1601 | } | |
0d0c377a | 1602 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 1603 | { |
0d0c377a | 1604 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
1605 | |
1606 | /* Setup lttng message with no payload */ | |
1607 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1608 | if (ret < 0) { | |
1609 | goto setup_error; | |
1610 | } | |
1611 | ||
0d0c377a DG |
1612 | switch (cmd_ctx->lsm->domain.type) { |
1613 | case LTTNG_DOMAIN_KERNEL: | |
1614 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, | |
1615 | cmd_ctx->session->kernel_session); | |
1616 | if (kchan == NULL) { | |
1617 | /* Channel not found, creating it */ | |
1618 | DBG("Creating kernel channel"); | |
7d29a247 | 1619 | |
0d0c377a | 1620 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c DG |
1621 | &cmd_ctx->lsm->u.channel.chan, |
1622 | cmd_ctx->session->kernel_session->trace_path); | |
0d0c377a DG |
1623 | if (ret < 0) { |
1624 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1625 | goto error; | |
1626 | } | |
7d29a247 | 1627 | |
0d0c377a DG |
1628 | /* Notify kernel thread that there is a new channel */ |
1629 | ret = notify_kernel_pollfd(); | |
1630 | if (ret < 0) { | |
1631 | ret = LTTCOMM_FATAL; | |
1632 | goto error; | |
1633 | } | |
1634 | } else if (kchan->enabled == 0) { | |
1635 | ret = kernel_enable_channel(kchan); | |
1636 | if (ret < 0) { | |
1637 | if (ret != EEXIST) { | |
1638 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
1639 | } | |
1640 | goto error; | |
d36b8583 | 1641 | } |
d36b8583 | 1642 | } |
0d0c377a DG |
1643 | |
1644 | kernel_wait_quiescent(kernel_tracer_fd); | |
1645 | break; | |
1646 | default: | |
1647 | /* TODO: Userspace tracing */ | |
1648 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1649 | goto error; | |
d36b8583 DG |
1650 | } |
1651 | ||
d36b8583 DG |
1652 | ret = LTTCOMM_OK; |
1653 | break; | |
1654 | } | |
0d0c377a | 1655 | case LTTNG_ENABLE_EVENT: |
894be886 | 1656 | { |
7d29a247 DG |
1657 | char *channel_name; |
1658 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 1659 | struct ltt_kernel_event *kevent; |
7d29a247 | 1660 | struct lttng_channel *chan; |
f3ed775e | 1661 | |
894be886 DG |
1662 | /* Setup lttng message with no payload */ |
1663 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1664 | if (ret < 0) { | |
1665 | goto setup_error; | |
1666 | } | |
1667 | ||
7d29a247 DG |
1668 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1669 | ||
0d0c377a DG |
1670 | switch (cmd_ctx->lsm->domain.type) { |
1671 | case LTTNG_DOMAIN_KERNEL: | |
1672 | do { | |
1673 | kchan = get_kernel_channel_by_name(channel_name, | |
1674 | cmd_ctx->session->kernel_session); | |
1675 | if (kchan == NULL) { | |
1676 | DBG("Channel not found. Creating channel %s", channel_name); | |
1677 | ||
1678 | chan = init_default_channel(channel_name); | |
1679 | if (chan == NULL) { | |
1680 | ret = LTTCOMM_FATAL; | |
1681 | goto error; | |
1682 | } | |
7d29a247 | 1683 | |
0d0c377a | 1684 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c | 1685 | chan, cmd_ctx->session->kernel_session->trace_path); |
0d0c377a DG |
1686 | if (ret < 0) { |
1687 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1688 | goto error; | |
1689 | } | |
7d29a247 | 1690 | } |
0d0c377a | 1691 | } while (kchan == NULL); |
7d29a247 | 1692 | |
0d0c377a DG |
1693 | kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
1694 | if (kevent == NULL) { | |
1695 | DBG("Creating kernel event %s for channel %s.", | |
1696 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
1697 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
1698 | } else { | |
1699 | DBG("Enabling kernel event %s for channel %s.", | |
1700 | kevent->event->name, channel_name); | |
1701 | ret = kernel_enable_event(kevent); | |
1702 | if (ret == -EEXIST) { | |
1703 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
1704 | goto error; |
1705 | } | |
1706 | } | |
f34daff7 | 1707 | |
0d0c377a DG |
1708 | if (ret < 0) { |
1709 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
1710 | goto error; |
1711 | } | |
19e70852 | 1712 | |
0d0c377a DG |
1713 | kernel_wait_quiescent(kernel_tracer_fd); |
1714 | break; | |
1715 | default: | |
1716 | /* TODO: Userspace tracing */ | |
1717 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 1718 | goto error; |
f3ed775e | 1719 | } |
19e70852 | 1720 | ret = LTTCOMM_OK; |
894be886 DG |
1721 | break; |
1722 | } | |
0d0c377a | 1723 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 1724 | { |
9f19cc17 DG |
1725 | int size, i; |
1726 | char *channel_name; | |
7d29a247 | 1727 | struct ltt_kernel_channel *kchan; |
0d0c377a | 1728 | struct ltt_kernel_event *kevent; |
9f19cc17 | 1729 | struct lttng_event *event_list; |
7d29a247 | 1730 | struct lttng_channel *chan; |
33a2b854 DG |
1731 | |
1732 | /* Setup lttng message with no payload */ | |
1733 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1734 | if (ret < 0) { | |
1735 | goto setup_error; | |
1736 | } | |
1737 | ||
1738 | DBG("Enabling all kernel event"); | |
1739 | ||
7d29a247 DG |
1740 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1741 | ||
0d0c377a DG |
1742 | switch (cmd_ctx->lsm->domain.type) { |
1743 | case LTTNG_DOMAIN_KERNEL: | |
1744 | do { | |
1745 | kchan = get_kernel_channel_by_name(channel_name, | |
1746 | cmd_ctx->session->kernel_session); | |
1747 | if (kchan == NULL) { | |
1748 | DBG("Channel not found. Creating channel %s", channel_name); | |
1749 | ||
1750 | chan = init_default_channel(channel_name); | |
1751 | if (chan == NULL) { | |
1752 | ret = LTTCOMM_FATAL; | |
1753 | goto error; | |
1754 | } | |
7d29a247 | 1755 | |
0d0c377a | 1756 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c | 1757 | chan, cmd_ctx->session->kernel_session->trace_path); |
0d0c377a DG |
1758 | if (ret < 0) { |
1759 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1760 | goto error; | |
1761 | } | |
7d29a247 | 1762 | } |
0d0c377a | 1763 | } while (kchan == NULL); |
7d29a247 | 1764 | |
0d0c377a DG |
1765 | /* For each event in the kernel session */ |
1766 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1767 | DBG("Enabling kernel event %s for channel %s.", | |
1768 | kevent->event->name, channel_name); | |
1769 | ret = kernel_enable_event(kevent); | |
7d29a247 | 1770 | if (ret < 0) { |
0d0c377a | 1771 | continue; |
7d29a247 DG |
1772 | } |
1773 | } | |
33a2b854 | 1774 | |
0d0c377a DG |
1775 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
1776 | if (size < 0) { | |
1777 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1778 | goto error; | |
f3ed775e | 1779 | } |
f3ed775e | 1780 | |
0d0c377a DG |
1781 | for (i = 0; i < size; i++) { |
1782 | kevent = get_kernel_event_by_name(event_list[i].name, kchan); | |
1783 | if (kevent == NULL) { | |
1784 | /* Default event type for enable all */ | |
1785 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
1786 | /* Enable each single tracepoint event */ | |
1787 | ret = kernel_create_event(&event_list[i], kchan); | |
1788 | if (ret < 0) { | |
1789 | /* Ignore error here and continue */ | |
1790 | } | |
950131af | 1791 | } |
33a2b854 | 1792 | } |
33a2b854 | 1793 | |
0d0c377a DG |
1794 | free(event_list); |
1795 | ||
1796 | /* Quiescent wait after event enable */ | |
1797 | kernel_wait_quiescent(kernel_tracer_fd); | |
1798 | break; | |
1799 | default: | |
1800 | /* TODO: Userspace tracing */ | |
1801 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1802 | goto error; | |
1803 | } | |
33a2b854 DG |
1804 | |
1805 | ret = LTTCOMM_OK; | |
1806 | break; | |
1807 | } | |
052da939 | 1808 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 1809 | { |
9f19cc17 | 1810 | struct lttng_event *events; |
052da939 DG |
1811 | ssize_t nb_events = 0; |
1812 | ||
1813 | switch (cmd_ctx->lsm->domain.type) { | |
1814 | case LTTNG_DOMAIN_KERNEL: | |
1815 | DBG("Listing kernel events"); | |
1816 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
1817 | if (nb_events < 0) { | |
1818 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1819 | goto error; | |
1820 | } | |
1821 | break; | |
1822 | default: | |
1823 | /* TODO: Userspace listing */ | |
1824 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1825 | break; | |
2ef84c95 DG |
1826 | } |
1827 | ||
1828 | /* | |
1829 | * Setup lttng message with payload size set to the event list size in | |
1830 | * bytes and then copy list into the llm payload. | |
1831 | */ | |
052da939 | 1832 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 1833 | if (ret < 0) { |
052da939 | 1834 | free(events); |
2ef84c95 DG |
1835 | goto setup_error; |
1836 | } | |
1837 | ||
1838 | /* Copy event list into message payload */ | |
9f19cc17 | 1839 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 1840 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 1841 | |
9f19cc17 | 1842 | free(events); |
2ef84c95 DG |
1843 | |
1844 | ret = LTTCOMM_OK; | |
1845 | break; | |
1846 | } | |
f3ed775e | 1847 | case LTTNG_START_TRACE: |
8c0faa1d DG |
1848 | { |
1849 | struct ltt_kernel_channel *chan; | |
f3ed775e | 1850 | |
8c0faa1d DG |
1851 | /* Setup lttng message with no payload */ |
1852 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1853 | if (ret < 0) { | |
1854 | goto setup_error; | |
1855 | } | |
1856 | ||
f3ed775e DG |
1857 | /* Kernel tracing */ |
1858 | if (cmd_ctx->session->kernel_session != NULL) { | |
1859 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
1860 | DBG("Open kernel metadata"); | |
58a97671 | 1861 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
63053e7c | 1862 | cmd_ctx->session->kernel_session->trace_path); |
f3ed775e DG |
1863 | if (ret < 0) { |
1864 | ret = LTTCOMM_KERN_META_FAIL; | |
1865 | goto error; | |
1866 | } | |
1867 | } | |
8c0faa1d | 1868 | |
f3ed775e DG |
1869 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
1870 | DBG("Opening kernel metadata stream"); | |
1871 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
1872 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
1873 | if (ret < 0) { | |
1874 | ERR("Kernel create metadata stream failed"); | |
1875 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1876 | goto error; | |
1877 | } | |
1878 | } | |
1879 | } | |
8c0faa1d | 1880 | |
f3ed775e | 1881 | /* For each channel */ |
0d0c377a DG |
1882 | cds_list_for_each_entry(chan, |
1883 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
1884 | if (chan->stream_count == 0) { |
1885 | ret = kernel_open_channel_stream(chan); | |
1886 | if (ret < 0) { | |
1887 | ERR("Kernel create channel stream failed"); | |
1888 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1889 | goto error; | |
1890 | } | |
1891 | /* Update the stream global counter */ | |
1892 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | DBG("Start kernel tracing"); | |
1897 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
8c0faa1d | 1898 | if (ret < 0) { |
f3ed775e DG |
1899 | ERR("Kernel start session failed"); |
1900 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1901 | goto error; |
1902 | } | |
8c0faa1d | 1903 | |
f3ed775e DG |
1904 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
1905 | if (ret < 0) { | |
1906 | ret = LTTCOMM_KERN_START_FAIL; | |
8c0faa1d DG |
1907 | goto error; |
1908 | } | |
8c0faa1d | 1909 | |
f3ed775e DG |
1910 | /* Quiescent wait after starting trace */ |
1911 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1912 | } |
1913 | ||
f3ed775e | 1914 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
1915 | |
1916 | ret = LTTCOMM_OK; | |
1917 | break; | |
1918 | } | |
f3ed775e | 1919 | case LTTNG_STOP_TRACE: |
8c0faa1d | 1920 | { |
f3ed775e | 1921 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
1922 | /* Setup lttng message with no payload */ |
1923 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1924 | if (ret < 0) { | |
1925 | goto setup_error; | |
1926 | } | |
1927 | ||
f3ed775e DG |
1928 | /* Kernel tracer */ |
1929 | if (cmd_ctx->session->kernel_session != NULL) { | |
1930 | DBG("Stop kernel tracing"); | |
84291629 | 1931 | |
f3ed775e DG |
1932 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
1933 | if (ret < 0) { | |
1934 | ERR("Kernel metadata flush failed"); | |
1935 | } | |
8c0faa1d | 1936 | |
f3ed775e DG |
1937 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
1938 | ret = kernel_flush_buffer(chan); | |
1939 | if (ret < 0) { | |
1940 | ERR("Kernel flush buffer error"); | |
1941 | } | |
1942 | } | |
1943 | ||
1944 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
1945 | if (ret < 0) { | |
1946 | ERR("Kernel stop session failed"); | |
1947 | ret = LTTCOMM_KERN_STOP_FAIL; | |
1948 | goto error; | |
1949 | } | |
1950 | ||
1951 | /* Quiescent wait after stopping trace */ | |
1952 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1953 | } |
1954 | ||
f3ed775e | 1955 | /* TODO : User-space tracer */ |
8c0faa1d DG |
1956 | |
1957 | ret = LTTCOMM_OK; | |
1958 | break; | |
1959 | } | |
5e16da05 MD |
1960 | case LTTNG_CREATE_SESSION: |
1961 | { | |
5461b305 DG |
1962 | /* Setup lttng message with no payload */ |
1963 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1964 | if (ret < 0) { | |
1965 | goto setup_error; | |
1966 | } | |
1967 | ||
42abccdb | 1968 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
5e16da05 | 1969 | if (ret < 0) { |
f3ed775e | 1970 | if (ret == -EEXIST) { |
5e16da05 MD |
1971 | ret = LTTCOMM_EXIST_SESS; |
1972 | } else { | |
aaf97519 | 1973 | ret = LTTCOMM_FATAL; |
aaf97519 | 1974 | } |
5461b305 | 1975 | goto error; |
8028d920 | 1976 | } |
1657e9bb | 1977 | |
5461b305 | 1978 | ret = LTTCOMM_OK; |
5e16da05 MD |
1979 | break; |
1980 | } | |
1981 | case LTTNG_DESTROY_SESSION: | |
1982 | { | |
5461b305 DG |
1983 | /* Setup lttng message with no payload */ |
1984 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1985 | if (ret < 0) { | |
1986 | goto setup_error; | |
1987 | } | |
1988 | ||
f3ed775e DG |
1989 | /* Clean kernel session teardown */ |
1990 | teardown_kernel_session(cmd_ctx->session); | |
1991 | ||
42abccdb | 1992 | ret = destroy_session(cmd_ctx->lsm->session.name); |
5e16da05 | 1993 | if (ret < 0) { |
f3ed775e | 1994 | ret = LTTCOMM_FATAL; |
5461b305 | 1995 | goto error; |
5e16da05 | 1996 | } |
1657e9bb | 1997 | |
7a485870 DG |
1998 | /* |
1999 | * Must notify the kernel thread here to update it's pollfd in order to | |
2000 | * remove the channel(s)' fd just destroyed. | |
2001 | */ | |
2002 | ret = notify_kernel_pollfd(); | |
2003 | if (ret < 0) { | |
2004 | ret = LTTCOMM_FATAL; | |
2005 | goto error; | |
2006 | } | |
2007 | ||
5461b305 DG |
2008 | ret = LTTCOMM_OK; |
2009 | break; | |
5e16da05 | 2010 | } |
9f19cc17 | 2011 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2012 | { |
4b222185 | 2013 | size_t nb_dom = 0; |
5461b305 | 2014 | |
9f19cc17 DG |
2015 | if (cmd_ctx->session->kernel_session != NULL) { |
2016 | nb_dom++; | |
ce3d728c | 2017 | } |
520ff687 | 2018 | |
9f19cc17 DG |
2019 | nb_dom += cmd_ctx->session->ust_trace_count; |
2020 | ||
2021 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2022 | if (ret < 0) { |
2023 | goto setup_error; | |
520ff687 | 2024 | } |
57167058 | 2025 | |
9f19cc17 DG |
2026 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2027 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2028 | |
9f19cc17 | 2029 | /* TODO: User-space tracer domain support */ |
5461b305 | 2030 | ret = LTTCOMM_OK; |
5e16da05 MD |
2031 | break; |
2032 | } | |
9f19cc17 | 2033 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2034 | { |
9f19cc17 DG |
2035 | /* |
2036 | * TODO: Only kernel channels are listed here. UST listing | |
2037 | * is needed on lttng-ust 2.0 release. | |
2038 | */ | |
2039 | size_t nb_chan = 0; | |
2040 | if (cmd_ctx->session->kernel_session != NULL) { | |
2041 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2042 | } |
ca95a216 | 2043 | |
9f19cc17 DG |
2044 | ret = setup_lttng_msg(cmd_ctx, |
2045 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2046 | if (ret < 0) { |
2047 | goto setup_error; | |
2048 | } | |
9f19cc17 DG |
2049 | |
2050 | list_lttng_channels(cmd_ctx->session, | |
2051 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2052 | ||
2053 | ret = LTTCOMM_OK; | |
5461b305 | 2054 | break; |
5e16da05 | 2055 | } |
9f19cc17 | 2056 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2057 | { |
9f19cc17 DG |
2058 | /* |
2059 | * TODO: Only kernel events are listed here. UST listing | |
2060 | * is needed on lttng-ust 2.0 release. | |
2061 | */ | |
2062 | size_t nb_event = 0; | |
2063 | struct ltt_kernel_channel *kchan = NULL; | |
2064 | ||
2065 | if (cmd_ctx->session->kernel_session != NULL) { | |
2066 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.list.channel_name, | |
2067 | cmd_ctx->session->kernel_session); | |
2068 | if (kchan == NULL) { | |
2069 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2070 | goto error; | |
2071 | } | |
2072 | nb_event += kchan->event_count; | |
5461b305 | 2073 | } |
ca95a216 | 2074 | |
9f19cc17 DG |
2075 | ret = setup_lttng_msg(cmd_ctx, |
2076 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2077 | if (ret < 0) { |
2078 | goto setup_error; | |
2079 | } | |
9f19cc17 | 2080 | |
ced2f820 | 2081 | DBG("Listing events (%zu events)", nb_event); |
9f19cc17 DG |
2082 | |
2083 | list_lttng_events(kchan, | |
2084 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2085 | ||
2086 | ret = LTTCOMM_OK; | |
5461b305 | 2087 | break; |
5e16da05 MD |
2088 | } |
2089 | case LTTNG_LIST_SESSIONS: | |
2090 | { | |
6c9cc2ab | 2091 | lock_session_list(); |
5461b305 | 2092 | |
6c9cc2ab | 2093 | if (session_list_ptr->count == 0) { |
f3ed775e | 2094 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2095 | unlock_session_list(); |
5461b305 | 2096 | goto error; |
57167058 | 2097 | } |
5e16da05 | 2098 | |
6c9cc2ab DG |
2099 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2100 | session_list_ptr->count); | |
5461b305 | 2101 | if (ret < 0) { |
36a83748 | 2102 | unlock_session_list(); |
5461b305 | 2103 | goto setup_error; |
e065084a | 2104 | } |
5e16da05 | 2105 | |
6c9cc2ab DG |
2106 | /* Filled the session array */ |
2107 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2108 | ||
2109 | unlock_session_list(); | |
5e16da05 | 2110 | |
5461b305 | 2111 | ret = LTTCOMM_OK; |
5e16da05 MD |
2112 | break; |
2113 | } | |
d0254c7c MD |
2114 | |
2115 | case LTTNG_CALIBRATE: | |
2116 | { | |
2117 | /* Setup lttng message with no payload */ | |
2118 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2119 | if (ret < 0) { | |
2120 | goto setup_error; | |
2121 | } | |
2122 | ||
2123 | switch (cmd_ctx->lsm->domain.type) { | |
2124 | case LTTNG_DOMAIN_KERNEL: | |
2125 | { | |
2126 | struct lttng_kernel_calibrate kcalibrate; | |
2127 | ||
2128 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2129 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2130 | if (ret < 0) { | |
2131 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2132 | goto error; | |
2133 | } | |
2134 | break; | |
2135 | } | |
2136 | default: | |
2137 | /* TODO: Userspace tracing */ | |
2138 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2139 | goto error; | |
2140 | } | |
2141 | ret = LTTCOMM_OK; | |
2142 | break; | |
2143 | } | |
2144 | ||
5e16da05 MD |
2145 | default: |
2146 | /* Undefined command */ | |
5461b305 DG |
2147 | ret = setup_lttng_msg(cmd_ctx, 0); |
2148 | if (ret < 0) { | |
2149 | goto setup_error; | |
2150 | } | |
2151 | ||
5e16da05 | 2152 | ret = LTTCOMM_UND; |
5461b305 | 2153 | break; |
fac6795d DG |
2154 | } |
2155 | ||
5461b305 DG |
2156 | /* Set return code */ |
2157 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2158 | |
b5541356 DG |
2159 | if (cmd_ctx->session) { |
2160 | unlock_session(cmd_ctx->session); | |
2161 | } | |
2162 | ||
e065084a DG |
2163 | return ret; |
2164 | ||
5461b305 | 2165 | error: |
5461b305 DG |
2166 | if (cmd_ctx->llm == NULL) { |
2167 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2168 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2169 | goto setup_error; |
2170 | } | |
2171 | } | |
e065084a | 2172 | /* Notify client of error */ |
5461b305 | 2173 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2174 | |
5461b305 | 2175 | setup_error: |
b5541356 DG |
2176 | if (cmd_ctx->session) { |
2177 | unlock_session(cmd_ctx->session); | |
2178 | } | |
8028d920 | 2179 | return ret; |
fac6795d DG |
2180 | } |
2181 | ||
1d4b027a | 2182 | /* |
d063d709 DG |
2183 | * This thread manage all clients request using the unix client socket for |
2184 | * communication. | |
1d4b027a DG |
2185 | */ |
2186 | static void *thread_manage_clients(void *data) | |
2187 | { | |
273ea72c DG |
2188 | int sock = 0, ret; |
2189 | struct command_ctx *cmd_ctx = NULL; | |
2190 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2191 | |
2192 | DBG("[thread] Manage client started"); | |
2193 | ||
2194 | ret = lttcomm_listen_unix_sock(client_sock); | |
2195 | if (ret < 0) { | |
2196 | goto error; | |
2197 | } | |
2198 | ||
273ea72c DG |
2199 | /* First fd is always the quit pipe */ |
2200 | pollfd[0].fd = thread_quit_pipe[0]; | |
2201 | ||
2202 | /* Apps socket */ | |
2203 | pollfd[1].fd = client_sock; | |
2204 | pollfd[1].events = POLLIN; | |
2205 | ||
1d4b027a DG |
2206 | /* Notify parent pid that we are ready |
2207 | * to accept command for client side. | |
2208 | */ | |
2209 | if (opt_sig_parent) { | |
2210 | kill(ppid, SIGCHLD); | |
2211 | } | |
2212 | ||
2213 | while (1) { | |
1d4b027a | 2214 | DBG("Accepting client command ..."); |
273ea72c DG |
2215 | |
2216 | /* Inifinite blocking call, waiting for transmission */ | |
2217 | ret = poll(pollfd, 2, -1); | |
2218 | if (ret < 0) { | |
2219 | perror("poll client thread"); | |
2220 | goto error; | |
2221 | } | |
2222 | ||
2223 | /* Thread quit pipe has been closed. Killing thread. */ | |
2224 | if (pollfd[0].revents == POLLNVAL) { | |
2225 | goto error; | |
2226 | } else if (pollfd[1].revents == POLLERR) { | |
2227 | ERR("Client socket poll error"); | |
2228 | goto error; | |
2229 | } | |
2230 | ||
1d4b027a DG |
2231 | sock = lttcomm_accept_unix_sock(client_sock); |
2232 | if (sock < 0) { | |
2233 | goto error; | |
2234 | } | |
2235 | ||
2236 | /* Allocate context command to process the client request */ | |
2237 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2238 | ||
2239 | /* Allocate data buffer for reception */ | |
2240 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2241 | cmd_ctx->llm = NULL; | |
2242 | cmd_ctx->session = NULL; | |
2243 | ||
2244 | /* | |
2245 | * Data is received from the lttng client. The struct | |
2246 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2247 | * the client. | |
2248 | */ | |
2249 | DBG("Receiving data from client ..."); | |
2250 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2251 | if (ret <= 0) { | |
2252 | continue; | |
2253 | } | |
2254 | ||
f7776ea7 DG |
2255 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2256 | ||
1d4b027a DG |
2257 | /* |
2258 | * This function dispatch the work to the kernel or userspace tracer | |
2259 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2260 | * informations for the client. The command context struct contains | |
2261 | * everything this function may needs. | |
2262 | */ | |
2263 | ret = process_client_msg(cmd_ctx); | |
2264 | if (ret < 0) { | |
2265 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2266 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2267 | /* Error detected but still accept command */ | |
a2fb29a5 | 2268 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2269 | continue; |
2270 | } | |
2271 | ||
2272 | DBG("Sending response (size: %d, retcode: %d)", | |
2273 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2274 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2275 | if (ret < 0) { | |
2276 | ERR("Failed to send data back to client"); | |
2277 | } | |
2278 | ||
a2fb29a5 | 2279 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2280 | |
2281 | /* End of transmission */ | |
2282 | close(sock); | |
1d4b027a DG |
2283 | } |
2284 | ||
2285 | error: | |
273ea72c DG |
2286 | DBG("Client thread dying"); |
2287 | if (client_sock) { | |
2288 | close(client_sock); | |
2289 | } | |
2290 | if (sock) { | |
2291 | close(sock); | |
2292 | } | |
2293 | ||
2294 | unlink(client_unix_sock_path); | |
2295 | ||
a2fb29a5 | 2296 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2297 | return NULL; |
2298 | } | |
2299 | ||
2300 | ||
fac6795d DG |
2301 | /* |
2302 | * usage function on stderr | |
2303 | */ | |
2304 | static void usage(void) | |
2305 | { | |
b716ce68 | 2306 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2307 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2308 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2309 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2310 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2311 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2312 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2313 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2314 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2315 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2316 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2317 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2318 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2319 | } |
2320 | ||
2321 | /* | |
2322 | * daemon argument parsing | |
2323 | */ | |
2324 | static int parse_args(int argc, char **argv) | |
2325 | { | |
2326 | int c; | |
2327 | ||
2328 | static struct option long_options[] = { | |
2329 | { "client-sock", 1, 0, 'c' }, | |
2330 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2331 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2332 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2333 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2334 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2335 | { "help", 0, 0, 'h' }, |
2336 | { "group", 1, 0, 'g' }, | |
2337 | { "version", 0, 0, 'V' }, | |
75462a81 | 2338 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2339 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2340 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2341 | { NULL, 0, 0, 0 } |
2342 | }; | |
2343 | ||
2344 | while (1) { | |
2345 | int option_index = 0; | |
31f73cc9 | 2346 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2347 | if (c == -1) { |
2348 | break; | |
2349 | } | |
2350 | ||
2351 | switch (c) { | |
2352 | case 0: | |
2353 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2354 | if (optarg) { | |
2355 | fprintf(stderr, " with arg %s\n", optarg); | |
2356 | } | |
2357 | break; | |
b716ce68 | 2358 | case 'c': |
fac6795d DG |
2359 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2360 | break; | |
2361 | case 'a': | |
2362 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2363 | break; | |
2364 | case 'd': | |
2365 | opt_daemon = 1; | |
2366 | break; | |
2367 | case 'g': | |
2368 | opt_tracing_group = strdup(optarg); | |
2369 | break; | |
2370 | case 'h': | |
2371 | usage(); | |
2372 | exit(EXIT_FAILURE); | |
2373 | case 'V': | |
2374 | fprintf(stdout, "%s\n", VERSION); | |
2375 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2376 | case 'S': |
2377 | opt_sig_parent = 1; | |
2378 | break; | |
d6f42150 DG |
2379 | case 'E': |
2380 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2381 | break; | |
2382 | case 'C': | |
2383 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2384 | break; | |
75462a81 DG |
2385 | case 'q': |
2386 | opt_quiet = 1; | |
2387 | break; | |
3f9947db | 2388 | case 'v': |
53086306 DG |
2389 | /* Verbose level can increase using multiple -v */ |
2390 | opt_verbose += 1; | |
3f9947db | 2391 | break; |
31f73cc9 MD |
2392 | case 'Z': |
2393 | opt_verbose_kconsumerd += 1; | |
2394 | break; | |
fac6795d DG |
2395 | default: |
2396 | /* Unknown option or other error. | |
2397 | * Error is printed by getopt, just return */ | |
2398 | return -1; | |
2399 | } | |
2400 | } | |
2401 | ||
2402 | return 0; | |
2403 | } | |
2404 | ||
2405 | /* | |
d063d709 | 2406 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2407 | * apps_sock - The communication socket for all UST apps. |
2408 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2409 | */ |
cf3af59e | 2410 | static int init_daemon_socket(void) |
fac6795d DG |
2411 | { |
2412 | int ret = 0; | |
2413 | mode_t old_umask; | |
2414 | ||
2415 | old_umask = umask(0); | |
2416 | ||
2417 | /* Create client tool unix socket */ | |
d6f42150 DG |
2418 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2419 | if (client_sock < 0) { | |
2420 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2421 | ret = -1; |
2422 | goto end; | |
2423 | } | |
2424 | ||
2425 | /* File permission MUST be 660 */ | |
2426 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2427 | if (ret < 0) { | |
d6f42150 | 2428 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2429 | perror("chmod"); |
2430 | goto end; | |
2431 | } | |
2432 | ||
2433 | /* Create the application unix socket */ | |
d6f42150 DG |
2434 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2435 | if (apps_sock < 0) { | |
2436 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2437 | ret = -1; |
2438 | goto end; | |
2439 | } | |
2440 | ||
d6f42150 | 2441 | /* File permission MUST be 666 */ |
fac6795d DG |
2442 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2443 | if (ret < 0) { | |
d6f42150 | 2444 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2445 | perror("chmod"); |
2446 | goto end; | |
2447 | } | |
2448 | ||
2449 | end: | |
2450 | umask(old_umask); | |
2451 | return ret; | |
2452 | } | |
2453 | ||
2454 | /* | |
7d8234d9 MD |
2455 | * Check if the global socket is available, and if a daemon is answering |
2456 | * at the other side. If yes, error is returned. | |
fac6795d | 2457 | */ |
cf3af59e | 2458 | static int check_existing_daemon(void) |
fac6795d | 2459 | { |
7d8234d9 MD |
2460 | if (access(client_unix_sock_path, F_OK) < 0 && |
2461 | access(apps_unix_sock_path, F_OK) < 0) | |
2462 | return 0; | |
2463 | /* Is there anybody out there ? */ | |
2464 | if (lttng_session_daemon_alive()) | |
2465 | return -EEXIST; | |
2466 | else | |
2467 | return 0; | |
fac6795d DG |
2468 | } |
2469 | ||
fac6795d | 2470 | /* |
d063d709 | 2471 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2472 | * |
d063d709 DG |
2473 | * Race window between mkdir and chown is OK because we are going from more |
2474 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2475 | */ |
d6f42150 | 2476 | static int set_permissions(void) |
fac6795d DG |
2477 | { |
2478 | int ret; | |
996b65c8 | 2479 | gid_t gid; |
fac6795d | 2480 | |
996b65c8 MD |
2481 | gid = allowed_group(); |
2482 | if (gid < 0) { | |
a463f419 DG |
2483 | if (is_root) { |
2484 | WARN("No tracing group detected"); | |
2485 | ret = 0; | |
2486 | } else { | |
2487 | ERR("Missing tracing group. Aborting execution."); | |
2488 | ret = -1; | |
2489 | } | |
fac6795d DG |
2490 | goto end; |
2491 | } | |
2492 | ||
d6f42150 | 2493 | /* Set lttng run dir */ |
996b65c8 | 2494 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
2495 | if (ret < 0) { |
2496 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2497 | perror("chown"); | |
2498 | } | |
2499 | ||
2500 | /* lttng client socket path */ | |
996b65c8 | 2501 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 2502 | if (ret < 0) { |
d6f42150 DG |
2503 | ERR("Unable to set group on %s", client_unix_sock_path); |
2504 | perror("chown"); | |
2505 | } | |
2506 | ||
2507 | /* kconsumerd error socket path */ | |
996b65c8 | 2508 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
2509 | if (ret < 0) { |
2510 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2511 | perror("chown"); |
2512 | } | |
2513 | ||
d6f42150 | 2514 | DBG("All permissions are set"); |
e07ae692 | 2515 | |
fac6795d DG |
2516 | end: |
2517 | return ret; | |
2518 | } | |
2519 | ||
7a485870 | 2520 | /* |
d063d709 | 2521 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2522 | */ |
2523 | static int create_kernel_poll_pipe(void) | |
2524 | { | |
2525 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2526 | } | |
2527 | ||
d6f42150 | 2528 | /* |
d063d709 | 2529 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2530 | */ |
2531 | static int create_lttng_rundir(void) | |
2532 | { | |
2533 | int ret; | |
2534 | ||
2535 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2536 | if (ret < 0) { | |
b1f11e69 DG |
2537 | if (errno != EEXIST) { |
2538 | ERR("Unable to create " LTTNG_RUNDIR); | |
2539 | goto error; | |
2540 | } else { | |
2541 | ret = 0; | |
2542 | } | |
d6f42150 DG |
2543 | } |
2544 | ||
2545 | error: | |
2546 | return ret; | |
2547 | } | |
2548 | ||
2549 | /* | |
d063d709 DG |
2550 | * Setup sockets and directory needed by the kconsumerd communication with the |
2551 | * session daemon. | |
d6f42150 DG |
2552 | */ |
2553 | static int set_kconsumerd_sockets(void) | |
2554 | { | |
2555 | int ret; | |
2556 | ||
2557 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2558 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2559 | } | |
2560 | ||
2561 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2562 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2563 | } | |
2564 | ||
2565 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2566 | if (ret < 0) { | |
6beb2242 DG |
2567 | if (errno != EEXIST) { |
2568 | ERR("Failed to create " KCONSUMERD_PATH); | |
2569 | goto error; | |
2570 | } | |
2571 | ret = 0; | |
d6f42150 DG |
2572 | } |
2573 | ||
2574 | /* Create the kconsumerd error unix socket */ | |
2575 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
2576 | if (kconsumerd_err_sock < 0) { | |
2577 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
2578 | ret = -1; | |
2579 | goto error; | |
2580 | } | |
2581 | ||
2582 | /* File permission MUST be 660 */ | |
2583 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2584 | if (ret < 0) { | |
2585 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
2586 | perror("chmod"); | |
2587 | goto error; | |
2588 | } | |
2589 | ||
2590 | error: | |
2591 | return ret; | |
2592 | } | |
2593 | ||
fac6795d | 2594 | /* |
d063d709 | 2595 | * Signal handler for the daemon |
cf3af59e MD |
2596 | * |
2597 | * Simply stop all worker threads, leaving main() return gracefully | |
2598 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
2599 | */ |
2600 | static void sighandler(int sig) | |
2601 | { | |
2602 | switch (sig) { | |
cf3af59e MD |
2603 | case SIGPIPE: |
2604 | DBG("SIGPIPE catched"); | |
2605 | return; | |
2606 | case SIGINT: | |
2607 | DBG("SIGINT catched"); | |
2608 | stop_threads(); | |
2609 | break; | |
2610 | case SIGTERM: | |
2611 | DBG("SIGTERM catched"); | |
2612 | stop_threads(); | |
2613 | break; | |
2614 | default: | |
2615 | break; | |
fac6795d | 2616 | } |
fac6795d DG |
2617 | } |
2618 | ||
2619 | /* | |
d063d709 | 2620 | * Setup signal handler for : |
1d4b027a | 2621 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 2622 | */ |
1d4b027a | 2623 | static int set_signal_handler(void) |
fac6795d | 2624 | { |
1d4b027a DG |
2625 | int ret = 0; |
2626 | struct sigaction sa; | |
2627 | sigset_t sigset; | |
fac6795d | 2628 | |
1d4b027a DG |
2629 | if ((ret = sigemptyset(&sigset)) < 0) { |
2630 | perror("sigemptyset"); | |
2631 | return ret; | |
2632 | } | |
d6f42150 | 2633 | |
1d4b027a DG |
2634 | sa.sa_handler = sighandler; |
2635 | sa.sa_mask = sigset; | |
2636 | sa.sa_flags = 0; | |
2637 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
2638 | perror("sigaction"); | |
2639 | return ret; | |
d6f42150 DG |
2640 | } |
2641 | ||
1d4b027a DG |
2642 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
2643 | perror("sigaction"); | |
2644 | return ret; | |
d6f42150 | 2645 | } |
aaf26714 | 2646 | |
1d4b027a DG |
2647 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
2648 | perror("sigaction"); | |
2649 | return ret; | |
8c0faa1d DG |
2650 | } |
2651 | ||
1d4b027a DG |
2652 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
2653 | ||
2654 | return ret; | |
fac6795d DG |
2655 | } |
2656 | ||
f3ed775e | 2657 | /* |
d063d709 DG |
2658 | * Set open files limit to unlimited. This daemon can open a large number of |
2659 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
2660 | */ |
2661 | static void set_ulimit(void) | |
2662 | { | |
2663 | int ret; | |
2664 | struct rlimit lim; | |
2665 | ||
a88df331 | 2666 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
2667 | lim.rlim_cur = 65535; |
2668 | lim.rlim_max = 65535; | |
2669 | ||
2670 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
2671 | if (ret < 0) { | |
2672 | perror("failed to set open files limit"); | |
2673 | } | |
2674 | } | |
2675 | ||
fac6795d DG |
2676 | /* |
2677 | * main | |
2678 | */ | |
2679 | int main(int argc, char **argv) | |
2680 | { | |
fac6795d DG |
2681 | int ret = 0; |
2682 | void *status; | |
b082db07 | 2683 | const char *home_path; |
fac6795d | 2684 | |
273ea72c | 2685 | /* Create thread quit pipe */ |
cf3af59e MD |
2686 | if ((ret = init_thread_quit_pipe()) < 0) { |
2687 | goto error; | |
273ea72c DG |
2688 | } |
2689 | ||
fac6795d DG |
2690 | /* Parse arguments */ |
2691 | progname = argv[0]; | |
2692 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 2693 | goto error; |
fac6795d DG |
2694 | } |
2695 | ||
2696 | /* Daemonize */ | |
2697 | if (opt_daemon) { | |
53094c05 DG |
2698 | ret = daemon(0, 0); |
2699 | if (ret < 0) { | |
2700 | perror("daemon"); | |
cf3af59e | 2701 | goto error; |
53094c05 | 2702 | } |
fac6795d DG |
2703 | } |
2704 | ||
2705 | /* Check if daemon is UID = 0 */ | |
2706 | is_root = !getuid(); | |
2707 | ||
fac6795d | 2708 | if (is_root) { |
d6f42150 DG |
2709 | ret = create_lttng_rundir(); |
2710 | if (ret < 0) { | |
cf3af59e | 2711 | goto error; |
d6f42150 DG |
2712 | } |
2713 | ||
fac6795d | 2714 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
2715 | snprintf(apps_unix_sock_path, PATH_MAX, |
2716 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
2717 | } |
2718 | ||
2719 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
2720 | snprintf(client_unix_sock_path, PATH_MAX, |
2721 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
2722 | } | |
fac6795d | 2723 | } else { |
b082db07 DG |
2724 | home_path = get_home_dir(); |
2725 | if (home_path == NULL) { | |
273ea72c DG |
2726 | /* TODO: Add --socket PATH option */ |
2727 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
2728 | ret = -EPERM; |
2729 | goto error; | |
b082db07 DG |
2730 | } |
2731 | ||
fac6795d | 2732 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 2733 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 2734 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
2735 | } |
2736 | ||
2737 | /* Set the cli tool unix socket path */ | |
2738 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 2739 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 2740 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d DG |
2741 | } |
2742 | } | |
2743 | ||
847177cd DG |
2744 | DBG("Client socket path %s", client_unix_sock_path); |
2745 | DBG("Application socket path %s", apps_unix_sock_path); | |
2746 | ||
273ea72c | 2747 | /* |
7d8234d9 | 2748 | * See if daemon already exist. |
fac6795d | 2749 | */ |
7d8234d9 | 2750 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 2751 | ERR("Already running daemon.\n"); |
273ea72c | 2752 | /* |
cf3af59e MD |
2753 | * We do not goto exit because we must not cleanup() |
2754 | * because a daemon is already running. | |
ab118b20 | 2755 | */ |
cf3af59e | 2756 | goto error; |
a88df331 DG |
2757 | } |
2758 | ||
2759 | /* After this point, we can safely call cleanup() so goto error is used */ | |
2760 | ||
2761 | /* | |
2762 | * These actions must be executed as root. We do that *after* setting up | |
2763 | * the sockets path because we MUST make the check for another daemon using | |
2764 | * those paths *before* trying to set the kernel consumer sockets and init | |
2765 | * kernel tracer. | |
2766 | */ | |
2767 | if (is_root) { | |
2768 | ret = set_kconsumerd_sockets(); | |
2769 | if (ret < 0) { | |
cf3af59e | 2770 | goto exit; |
a88df331 DG |
2771 | } |
2772 | ||
2773 | /* Setup kernel tracer */ | |
2774 | init_kernel_tracer(); | |
2775 | ||
2776 | /* Set ulimit for open files */ | |
2777 | set_ulimit(); | |
fac6795d DG |
2778 | } |
2779 | ||
cf3af59e MD |
2780 | if ((ret = set_signal_handler()) < 0) { |
2781 | goto exit; | |
fac6795d DG |
2782 | } |
2783 | ||
d6f42150 | 2784 | /* Setup the needed unix socket */ |
cf3af59e MD |
2785 | if ((ret = init_daemon_socket()) < 0) { |
2786 | goto exit; | |
fac6795d DG |
2787 | } |
2788 | ||
2789 | /* Set credentials to socket */ | |
cf3af59e MD |
2790 | if (is_root && ((ret = set_permissions()) < 0)) { |
2791 | goto exit; | |
fac6795d DG |
2792 | } |
2793 | ||
5b8719f5 DG |
2794 | /* Get parent pid if -S, --sig-parent is specified. */ |
2795 | if (opt_sig_parent) { | |
2796 | ppid = getppid(); | |
2797 | } | |
2798 | ||
7a485870 | 2799 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
2800 | if ((ret = create_kernel_poll_pipe()) < 0) { |
2801 | goto exit; | |
7a485870 DG |
2802 | } |
2803 | ||
273ea72c DG |
2804 | /* |
2805 | * Get session list pointer. This pointer MUST NOT be free(). | |
2806 | * This list is statically declared in session.c | |
2807 | */ | |
b5541356 DG |
2808 | session_list_ptr = get_session_list(); |
2809 | ||
cf3af59e MD |
2810 | /* Create thread to manage the client socket */ |
2811 | ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL); | |
2812 | if (ret != 0) { | |
2813 | perror("pthread_create"); | |
2814 | goto exit_client; | |
2815 | } | |
fac6795d | 2816 | |
cf3af59e MD |
2817 | /* Create thread to manage application socket */ |
2818 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
2819 | if (ret != 0) { | |
2820 | perror("pthread_create"); | |
2821 | goto exit_apps; | |
2822 | } | |
fac6795d | 2823 | |
cf3af59e MD |
2824 | /* Create kernel thread to manage kernel event */ |
2825 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
2826 | if (ret != 0) { | |
2827 | perror("pthread_create"); | |
2828 | goto exit_kernel; | |
2829 | } | |
7a485870 | 2830 | |
cf3af59e MD |
2831 | ret = pthread_join(kernel_thread, &status); |
2832 | if (ret != 0) { | |
2833 | perror("pthread_join"); | |
2834 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
2835 | } |
2836 | ||
cf3af59e MD |
2837 | exit_kernel: |
2838 | ret = pthread_join(apps_thread, &status); | |
2839 | if (ret != 0) { | |
2840 | perror("pthread_join"); | |
2841 | goto error; /* join error, exit without cleanup */ | |
2842 | } | |
fac6795d | 2843 | |
cf3af59e MD |
2844 | exit_apps: |
2845 | ret = pthread_join(client_thread, &status); | |
2846 | if (ret != 0) { | |
2847 | perror("pthread_join"); | |
2848 | goto error; /* join error, exit without cleanup */ | |
2849 | } | |
2850 | ||
2851 | ret = join_kconsumerd_thread(); | |
2852 | if (ret != 0) { | |
2853 | perror("join_kconsumerd"); | |
2854 | goto error; /* join error, exit without cleanup */ | |
2855 | } | |
a88df331 | 2856 | |
cf3af59e | 2857 | exit_client: |
a88df331 | 2858 | exit: |
cf3af59e MD |
2859 | /* |
2860 | * cleanup() is called when no other thread is running. | |
2861 | */ | |
2862 | cleanup(); | |
2863 | if (!ret) | |
2864 | exit(EXIT_SUCCESS); | |
2865 | error: | |
5e16da05 | 2866 | exit(EXIT_FAILURE); |
fac6795d | 2867 | } |