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