Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
996b65c8 | 3 | * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
7 | * as published by the Free Software Foundation; only version 2 |
8 | * of the License. | |
91d76f53 | 9 | * |
fac6795d DG |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
fac6795d DG |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
7a485870 | 25 | #include <poll.h> |
fac6795d | 26 | #include <pthread.h> |
8c0faa1d | 27 | #include <semaphore.h> |
fac6795d DG |
28 | #include <signal.h> |
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
37 | #include <unistd.h> | |
38 | ||
1e307fab | 39 | #include <ltt-kconsumerd.h> |
e88129fc | 40 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
41 | #include <lttng/lttng-kconsumerd.h> |
42 | #include <lttngerr.h> | |
fac6795d | 43 | |
099e26bd DG |
44 | #include "context.h" |
45 | #include "futex.h" | |
20fe2104 | 46 | #include "kernel-ctl.h" |
1e307fab | 47 | #include "ltt-sessiond.h" |
91d76f53 | 48 | #include "traceable-app.h" |
1e307fab | 49 | #include "ust-ctl.h" |
8e68d1c8 | 50 | #include "utils.h" |
0177d773 | 51 | #include "ust-ctl.h" |
fac6795d | 52 | |
75462a81 | 53 | /* Const values */ |
686204ab | 54 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 55 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
56 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
57 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
58 | ||
fac6795d | 59 | /* Variables */ |
1d4b027a | 60 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 61 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 62 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 63 | |
fac6795d DG |
64 | const char *progname; |
65 | const char *opt_tracing_group; | |
5b8719f5 | 66 | static int opt_sig_parent; |
fac6795d DG |
67 | static int opt_daemon; |
68 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
69 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
70 | static pid_t kconsumerd_pid; | |
7a485870 | 71 | static struct pollfd *kernel_pollfd; |
099e26bd | 72 | static int dispatch_thread_exit; |
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 | ||
099e26bd DG |
93 | /* |
94 | * This pipe is used to inform the thread managing application communication | |
95 | * that a command is queued and ready to be processed. | |
96 | */ | |
97 | static int apps_cmd_pipe[2]; | |
98 | ||
1d4b027a | 99 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 100 | static pthread_t kconsumerd_thread; |
1d4b027a | 101 | static pthread_t apps_thread; |
099e26bd | 102 | static pthread_t reg_apps_thread; |
1d4b027a | 103 | static pthread_t client_thread; |
7a485870 | 104 | static pthread_t kernel_thread; |
099e26bd | 105 | static pthread_t dispatch_thread; |
8c0faa1d DG |
106 | static sem_t kconsumerd_sem; |
107 | ||
1d4b027a | 108 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
fac6795d | 109 | |
ab147185 MD |
110 | static int modprobe_remove_kernel_modules(void); |
111 | ||
099e26bd DG |
112 | /* |
113 | * UST registration command queue. This queue is tied with a futex and uses a N | |
114 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
115 | * | |
116 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
117 | * this queue and the wait/wake scheme. | |
118 | */ | |
119 | static struct ust_cmd_queue ust_cmd_queue; | |
120 | ||
b5541356 DG |
121 | /* |
122 | * Pointer initialized before thread creation. | |
123 | * | |
124 | * This points to the tracing session list containing the session count and a | |
125 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
126 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 127 | * |
d063d709 DG |
128 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
129 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
130 | */ |
131 | static struct ltt_session_list *session_list_ptr; | |
132 | ||
996b65c8 MD |
133 | static gid_t allowed_group(void) |
134 | { | |
135 | struct group *grp; | |
136 | ||
274e143b MD |
137 | if (opt_tracing_group) { |
138 | grp = getgrnam(opt_tracing_group); | |
139 | } else { | |
140 | grp = getgrnam(default_tracing_group); | |
141 | } | |
996b65c8 MD |
142 | if (!grp) { |
143 | return -1; | |
144 | } else { | |
145 | return grp->gr_gid; | |
146 | } | |
147 | } | |
148 | ||
273ea72c DG |
149 | /* |
150 | * Init quit pipe. | |
151 | * | |
152 | * Return -1 on error or 0 if all pipes are created. | |
153 | */ | |
154 | static int init_thread_quit_pipe(void) | |
155 | { | |
156 | int ret; | |
157 | ||
158 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
159 | if (ret < 0) { | |
160 | perror("thread quit pipe"); | |
161 | goto error; | |
162 | } | |
163 | ||
164 | error: | |
165 | return ret; | |
166 | } | |
167 | ||
fac6795d | 168 | /* |
d063d709 DG |
169 | * Complete teardown of a kernel session. This free all data structure related |
170 | * to a kernel session and update counter. | |
fac6795d | 171 | */ |
1d4b027a | 172 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 173 | { |
1d4b027a DG |
174 | if (session->kernel_session != NULL) { |
175 | DBG("Tearing down kernel session"); | |
d9800920 DG |
176 | |
177 | /* | |
178 | * If a custom kernel consumer was registered, close the socket before | |
179 | * tearing down the complete kernel session structure | |
180 | */ | |
181 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
182 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
183 | } | |
184 | ||
62499ad6 | 185 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
186 | /* Extra precaution */ |
187 | session->kernel_session = NULL; | |
fac6795d | 188 | } |
fac6795d DG |
189 | } |
190 | ||
099e26bd DG |
191 | /* |
192 | * Stop all threads by closing the thread quit pipe. | |
193 | */ | |
cf3af59e MD |
194 | static void stop_threads(void) |
195 | { | |
196 | /* Stopping all threads */ | |
197 | DBG("Terminating all threads"); | |
198 | close(thread_quit_pipe[0]); | |
199 | close(thread_quit_pipe[1]); | |
099e26bd DG |
200 | /* Dispatch thread */ |
201 | dispatch_thread_exit = 1; | |
202 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
203 | } |
204 | ||
fac6795d | 205 | /* |
d063d709 | 206 | * Cleanup the daemon |
fac6795d | 207 | */ |
cf3af59e | 208 | static void cleanup(void) |
fac6795d | 209 | { |
1d4b027a DG |
210 | int ret; |
211 | char *cmd; | |
af9737e9 | 212 | struct ltt_session *sess, *stmp; |
fac6795d | 213 | |
1d4b027a | 214 | DBG("Cleaning up"); |
e07ae692 | 215 | |
1d4b027a | 216 | /* <fun> */ |
2f50c8a3 | 217 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
273ea72c DG |
218 | "Matthew, BEET driven development works!%c[%dm", |
219 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 220 | /* </fun> */ |
fac6795d | 221 | |
1d4b027a DG |
222 | DBG("Removing %s directory", LTTNG_RUNDIR); |
223 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
224 | if (ret < 0) { | |
225 | ERR("asprintf failed. Something is really wrong!"); | |
226 | } | |
5461b305 | 227 | |
1d4b027a DG |
228 | /* Remove lttng run directory */ |
229 | ret = system(cmd); | |
230 | if (ret < 0) { | |
231 | ERR("Unable to clean " LTTNG_RUNDIR); | |
232 | } | |
5461b305 | 233 | |
1d4b027a | 234 | DBG("Cleaning up all session"); |
fac6795d | 235 | |
b5541356 | 236 | /* Destroy session list mutex */ |
273ea72c DG |
237 | if (session_list_ptr != NULL) { |
238 | pthread_mutex_destroy(&session_list_ptr->lock); | |
239 | ||
240 | /* Cleanup ALL session */ | |
af9737e9 | 241 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
273ea72c DG |
242 | teardown_kernel_session(sess); |
243 | // TODO complete session cleanup (including UST) | |
244 | } | |
245 | } | |
246 | ||
099e26bd DG |
247 | DBG("Closing all UST sockets"); |
248 | clean_traceable_apps_list(); | |
249 | ||
273ea72c | 250 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
b5541356 | 251 | |
f3ed775e | 252 | DBG("Closing kernel fd"); |
1d4b027a | 253 | close(kernel_tracer_fd); |
ab147185 | 254 | |
2f50c8a3 DG |
255 | if (is_root) { |
256 | DBG("Unloading kernel modules"); | |
257 | modprobe_remove_kernel_modules(); | |
258 | } | |
fac6795d DG |
259 | } |
260 | ||
e065084a | 261 | /* |
d063d709 | 262 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 263 | * |
d063d709 | 264 | * Return lttcomm error code. |
e065084a DG |
265 | */ |
266 | static int send_unix_sock(int sock, void *buf, size_t len) | |
267 | { | |
268 | /* Check valid length */ | |
269 | if (len <= 0) { | |
270 | return -1; | |
271 | } | |
272 | ||
273 | return lttcomm_send_unix_sock(sock, buf, len); | |
274 | } | |
275 | ||
5461b305 | 276 | /* |
d063d709 | 277 | * Free memory of a command context structure. |
5461b305 | 278 | */ |
a2fb29a5 | 279 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 280 | { |
a2fb29a5 DG |
281 | DBG("Clean command context structure"); |
282 | if (*cmd_ctx) { | |
283 | if ((*cmd_ctx)->llm) { | |
284 | free((*cmd_ctx)->llm); | |
5461b305 | 285 | } |
a2fb29a5 DG |
286 | if ((*cmd_ctx)->lsm) { |
287 | free((*cmd_ctx)->lsm); | |
5461b305 | 288 | } |
a2fb29a5 DG |
289 | free(*cmd_ctx); |
290 | *cmd_ctx = NULL; | |
5461b305 DG |
291 | } |
292 | } | |
293 | ||
f3ed775e | 294 | /* |
d063d709 | 295 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 296 | */ |
7a485870 | 297 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
298 | { |
299 | int ret; | |
300 | size_t nb_fd; | |
301 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
302 | struct lttcomm_kconsumerd_header lkh; |
303 | struct lttcomm_kconsumerd_msg lkm; | |
304 | ||
7a485870 DG |
305 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
306 | ||
307 | nb_fd = channel->stream_count; | |
f3ed775e DG |
308 | |
309 | /* Setup header */ | |
7a485870 | 310 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
311 | lkh.cmd_type = ADD_STREAM; |
312 | ||
313 | DBG("Sending kconsumerd header"); | |
314 | ||
315 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
316 | if (ret < 0) { | |
317 | perror("send kconsumerd header"); | |
318 | goto error; | |
319 | } | |
320 | ||
7a485870 DG |
321 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
322 | if (stream->fd != 0) { | |
f3ed775e DG |
323 | lkm.fd = stream->fd; |
324 | lkm.state = stream->state; | |
7a485870 | 325 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 326 | lkm.output = channel->channel->attr.output; |
f3ed775e | 327 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 328 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
329 | |
330 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
331 | ||
332 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
333 | if (ret < 0) { | |
334 | perror("send kconsumerd fd"); | |
335 | goto error; | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
7a485870 | 340 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
341 | |
342 | return 0; | |
343 | ||
344 | error: | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /* | |
d063d709 | 349 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 350 | */ |
d9800920 | 351 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
352 | { |
353 | int ret; | |
354 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
355 | struct lttcomm_kconsumerd_header lkh; |
356 | struct lttcomm_kconsumerd_msg lkm; | |
357 | ||
358 | /* Setup header */ | |
359 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
360 | lkh.cmd_type = ADD_STREAM; | |
361 | ||
362 | DBG("Sending kconsumerd header for metadata"); | |
363 | ||
d9800920 | 364 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
7a485870 DG |
365 | if (ret < 0) { |
366 | perror("send kconsumerd header"); | |
367 | goto error; | |
368 | } | |
369 | ||
370 | DBG("Sending metadata stream fd"); | |
371 | ||
d9800920 DG |
372 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
373 | if (session->consumer_fd == 0) { | |
374 | session->consumer_fd = kconsumerd_cmd_sock; | |
375 | } | |
376 | ||
7a485870 DG |
377 | if (session->metadata_stream_fd != 0) { |
378 | /* Send metadata stream fd first */ | |
379 | lkm.fd = session->metadata_stream_fd; | |
380 | lkm.state = ACTIVE_FD; | |
381 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 382 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 383 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 384 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 385 | |
d9800920 | 386 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, &lkm.fd, 1, sizeof(lkm)); |
7a485870 DG |
387 | if (ret < 0) { |
388 | perror("send kconsumerd fd"); | |
389 | goto error; | |
390 | } | |
391 | } | |
f3ed775e | 392 | |
f3ed775e | 393 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 394 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 395 | if (ret < 0) { |
7a485870 | 396 | goto error; |
f3ed775e DG |
397 | } |
398 | } | |
399 | ||
7a485870 DG |
400 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
401 | ||
f3ed775e DG |
402 | return 0; |
403 | ||
404 | error: | |
405 | return ret; | |
406 | } | |
407 | ||
97b1a726 | 408 | #ifdef DISABLED |
fac6795d | 409 | /* |
d063d709 DG |
410 | * Notify apps by writing 42 to a named pipe using name. Every applications |
411 | * waiting for a ltt-sessiond will be notified and re-register automatically to | |
412 | * the session daemon. | |
fac6795d | 413 | * |
d063d709 | 414 | * Return open or write error value. |
fac6795d DG |
415 | */ |
416 | static int notify_apps(const char *name) | |
417 | { | |
418 | int fd; | |
419 | int ret = -1; | |
420 | ||
e07ae692 DG |
421 | DBG("Notify the global application pipe"); |
422 | ||
fac6795d DG |
423 | /* Try opening the global pipe */ |
424 | fd = open(name, O_WRONLY); | |
425 | if (fd < 0) { | |
426 | goto error; | |
427 | } | |
428 | ||
429 | /* Notify by writing on the pipe */ | |
430 | ret = write(fd, "42", 2); | |
431 | if (ret < 0) { | |
432 | perror("write"); | |
433 | } | |
434 | ||
435 | error: | |
436 | return ret; | |
437 | } | |
099e26bd | 438 | #endif /* DISABLED */ |
fac6795d | 439 | |
e065084a | 440 | /* |
d063d709 DG |
441 | * Setup the outgoing data buffer for the response (llm) by allocating the |
442 | * right amount of memory and copying the original information from the lsm | |
443 | * structure. | |
ca95a216 | 444 | * |
d063d709 | 445 | * Return total size of the buffer pointed by buf. |
ca95a216 | 446 | */ |
5461b305 | 447 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 448 | { |
f3ed775e | 449 | int ret, buf_size; |
ca95a216 | 450 | |
f3ed775e | 451 | buf_size = size; |
5461b305 DG |
452 | |
453 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
454 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 455 | perror("malloc"); |
5461b305 | 456 | ret = -ENOMEM; |
ca95a216 DG |
457 | goto error; |
458 | } | |
459 | ||
5461b305 DG |
460 | /* Copy common data */ |
461 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 462 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 463 | |
5461b305 DG |
464 | cmd_ctx->llm->data_size = size; |
465 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
466 | ||
ca95a216 DG |
467 | return buf_size; |
468 | ||
469 | error: | |
470 | return ret; | |
471 | } | |
472 | ||
7a485870 | 473 | /* |
d063d709 DG |
474 | * Update the kernel pollfd set of all channel fd available over all tracing |
475 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
476 | */ |
477 | static int update_kernel_pollfd(void) | |
478 | { | |
479 | int i = 0; | |
273ea72c DG |
480 | /* |
481 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
482 | * at 2 for those pipes. | |
483 | */ | |
484 | unsigned int nb_fd = 2; | |
7a485870 DG |
485 | struct ltt_session *session; |
486 | struct ltt_kernel_channel *channel; | |
487 | ||
488 | DBG("Updating kernel_pollfd"); | |
489 | ||
490 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 491 | lock_session_list(); |
b5541356 DG |
492 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
493 | lock_session(session); | |
7a485870 | 494 | if (session->kernel_session == NULL) { |
b5541356 | 495 | unlock_session(session); |
7a485870 DG |
496 | continue; |
497 | } | |
498 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 499 | unlock_session(session); |
7a485870 DG |
500 | } |
501 | ||
502 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
503 | ||
504 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
505 | if (kernel_pollfd == NULL) { | |
506 | perror("malloc kernel_pollfd"); | |
507 | goto error; | |
508 | } | |
509 | ||
b5541356 DG |
510 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
511 | lock_session(session); | |
7a485870 | 512 | if (session->kernel_session == NULL) { |
b5541356 | 513 | unlock_session(session); |
7a485870 DG |
514 | continue; |
515 | } | |
516 | if (i >= nb_fd) { | |
517 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 518 | unlock_session(session); |
7a485870 DG |
519 | break; |
520 | } | |
521 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
522 | kernel_pollfd[i].fd = channel->fd; | |
523 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
524 | i++; | |
525 | } | |
b5541356 | 526 | unlock_session(session); |
7a485870 | 527 | } |
6c9cc2ab | 528 | unlock_session_list(); |
7a485870 DG |
529 | |
530 | /* Adding wake up pipe */ | |
273ea72c DG |
531 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
532 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
533 | ||
534 | /* Adding the quit pipe */ | |
535 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
536 | |
537 | return nb_fd; | |
538 | ||
539 | error: | |
6c9cc2ab | 540 | unlock_session_list(); |
7a485870 DG |
541 | return -1; |
542 | } | |
543 | ||
544 | /* | |
d063d709 DG |
545 | * Find the channel fd from 'fd' over all tracing session. When found, check |
546 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 547 | * |
d063d709 | 548 | * Useful for CPU hotplug feature. |
7a485870 DG |
549 | */ |
550 | static int update_kernel_stream(int fd) | |
551 | { | |
552 | int ret = 0; | |
553 | struct ltt_session *session; | |
554 | struct ltt_kernel_channel *channel; | |
555 | ||
556 | DBG("Updating kernel streams for channel fd %d", fd); | |
557 | ||
6c9cc2ab | 558 | lock_session_list(); |
b5541356 DG |
559 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
560 | lock_session(session); | |
7a485870 | 561 | if (session->kernel_session == NULL) { |
b5541356 | 562 | unlock_session(session); |
7a485870 DG |
563 | continue; |
564 | } | |
d9800920 DG |
565 | |
566 | /* This is not suppose to be 0 but this is an extra security check */ | |
567 | if (session->kernel_session->consumer_fd == 0) { | |
568 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
569 | } | |
570 | ||
7a485870 DG |
571 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
572 | if (channel->fd == fd) { | |
573 | DBG("Channel found, updating kernel streams"); | |
574 | ret = kernel_open_channel_stream(channel); | |
575 | if (ret < 0) { | |
576 | goto end; | |
577 | } | |
d9800920 | 578 | |
7a485870 DG |
579 | /* |
580 | * Have we already sent fds to the consumer? If yes, it means that | |
581 | * tracing is started so it is safe to send our updated stream fds. | |
582 | */ | |
583 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
d9800920 DG |
584 | ret = send_kconsumerd_channel_fds(session->kernel_session->consumer_fd, |
585 | channel); | |
7a485870 DG |
586 | if (ret < 0) { |
587 | goto end; | |
588 | } | |
589 | } | |
590 | goto end; | |
591 | } | |
592 | } | |
b5541356 | 593 | unlock_session(session); |
7a485870 DG |
594 | } |
595 | ||
596 | end: | |
6c9cc2ab | 597 | unlock_session_list(); |
b5541356 DG |
598 | if (session) { |
599 | unlock_session(session); | |
600 | } | |
7a485870 DG |
601 | return ret; |
602 | } | |
603 | ||
604 | /* | |
d063d709 | 605 | * This thread manage event coming from the kernel. |
7a485870 | 606 | * |
d063d709 DG |
607 | * Features supported in this thread: |
608 | * -) CPU Hotplug | |
7a485870 DG |
609 | */ |
610 | static void *thread_manage_kernel(void *data) | |
611 | { | |
612 | int ret, i, nb_fd = 0; | |
613 | char tmp; | |
614 | int update_poll_flag = 1; | |
615 | ||
616 | DBG("Thread manage kernel started"); | |
617 | ||
618 | while (1) { | |
619 | if (update_poll_flag == 1) { | |
620 | nb_fd = update_kernel_pollfd(); | |
621 | if (nb_fd < 0) { | |
622 | goto error; | |
623 | } | |
624 | update_poll_flag = 0; | |
625 | } | |
626 | ||
627 | DBG("Polling on %d fds", nb_fd); | |
628 | ||
629 | /* Poll infinite value of time */ | |
630 | ret = poll(kernel_pollfd, nb_fd, -1); | |
631 | if (ret < 0) { | |
632 | perror("poll kernel thread"); | |
633 | goto error; | |
634 | } else if (ret == 0) { | |
635 | /* Should not happen since timeout is infinite */ | |
636 | continue; | |
637 | } | |
638 | ||
273ea72c DG |
639 | /* Thread quit pipe has been closed. Killing thread. */ |
640 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
641 | goto error; | |
642 | } | |
643 | ||
7a485870 DG |
644 | DBG("Kernel poll event triggered"); |
645 | ||
646 | /* | |
647 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
648 | * must be updated. | |
649 | */ | |
273ea72c | 650 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 651 | case POLLIN: |
7a485870 DG |
652 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
653 | update_poll_flag = 1; | |
654 | continue; | |
b5541356 DG |
655 | case POLLERR: |
656 | goto error; | |
657 | default: | |
658 | break; | |
7a485870 DG |
659 | } |
660 | ||
661 | for (i = 0; i < nb_fd; i++) { | |
662 | switch (kernel_pollfd[i].revents) { | |
663 | /* | |
664 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
665 | * session and updating the kernel consumer | |
666 | */ | |
667 | case POLLIN | POLLRDNORM: | |
668 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
669 | if (ret < 0) { | |
670 | continue; | |
671 | } | |
672 | break; | |
673 | } | |
674 | } | |
675 | } | |
676 | ||
677 | error: | |
678 | DBG("Kernel thread dying"); | |
679 | if (kernel_pollfd) { | |
680 | free(kernel_pollfd); | |
681 | } | |
273ea72c DG |
682 | |
683 | close(kernel_poll_pipe[0]); | |
684 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
685 | return NULL; |
686 | } | |
687 | ||
1d4b027a | 688 | /* |
d063d709 | 689 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
690 | */ |
691 | static void *thread_manage_kconsumerd(void *data) | |
692 | { | |
273ea72c | 693 | int sock = 0, ret; |
1d4b027a | 694 | enum lttcomm_return_code code; |
273ea72c | 695 | struct pollfd pollfd[2]; |
1d4b027a DG |
696 | |
697 | DBG("[thread] Manage kconsumerd started"); | |
698 | ||
699 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
700 | if (ret < 0) { | |
701 | goto error; | |
702 | } | |
703 | ||
273ea72c DG |
704 | /* First fd is always the quit pipe */ |
705 | pollfd[0].fd = thread_quit_pipe[0]; | |
706 | ||
707 | /* Apps socket */ | |
708 | pollfd[1].fd = kconsumerd_err_sock; | |
709 | pollfd[1].events = POLLIN; | |
710 | ||
711 | /* Inifinite blocking call, waiting for transmission */ | |
712 | ret = poll(pollfd, 2, -1); | |
713 | if (ret < 0) { | |
714 | perror("poll kconsumerd thread"); | |
715 | goto error; | |
716 | } | |
717 | ||
718 | /* Thread quit pipe has been closed. Killing thread. */ | |
719 | if (pollfd[0].revents == POLLNVAL) { | |
720 | goto error; | |
721 | } else if (pollfd[1].revents == POLLERR) { | |
722 | ERR("Kconsumerd err socket poll error"); | |
723 | goto error; | |
724 | } | |
725 | ||
1d4b027a DG |
726 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
727 | if (sock < 0) { | |
728 | goto error; | |
729 | } | |
730 | ||
712ea556 | 731 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
732 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
733 | if (ret <= 0) { | |
734 | goto error; | |
735 | } | |
736 | ||
737 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
738 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
739 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 740 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
741 | perror("kconsumerd connect"); |
742 | goto error; | |
743 | } | |
744 | /* Signal condition to tell that the kconsumerd is ready */ | |
745 | sem_post(&kconsumerd_sem); | |
746 | DBG("Kconsumerd command socket ready"); | |
747 | } else { | |
6f61d021 | 748 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
749 | lttcomm_get_readable_code(-code)); |
750 | goto error; | |
751 | } | |
752 | ||
72079cae DG |
753 | /* Kconsumerd err socket */ |
754 | pollfd[1].fd = sock; | |
755 | pollfd[1].events = POLLIN; | |
756 | ||
757 | /* Inifinite blocking call, waiting for transmission */ | |
758 | ret = poll(pollfd, 2, -1); | |
759 | if (ret < 0) { | |
760 | perror("poll kconsumerd thread"); | |
761 | goto error; | |
762 | } | |
763 | ||
764 | /* Thread quit pipe has been closed. Killing thread. */ | |
765 | if (pollfd[0].revents == POLLNVAL) { | |
766 | goto error; | |
767 | } else if (pollfd[1].revents == POLLERR) { | |
768 | ERR("Kconsumerd err socket second poll error"); | |
769 | goto error; | |
770 | } | |
771 | ||
712ea556 DG |
772 | /* Wait for any kconsumerd error */ |
773 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
774 | if (ret <= 0) { | |
775 | ERR("Kconsumerd closed the command socket"); | |
776 | goto error; | |
6f61d021 | 777 | } |
1d4b027a | 778 | |
712ea556 DG |
779 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
780 | ||
1d4b027a | 781 | error: |
6f61d021 | 782 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
783 | if (kconsumerd_err_sock) { |
784 | close(kconsumerd_err_sock); | |
785 | } | |
786 | if (kconsumerd_cmd_sock) { | |
787 | close(kconsumerd_cmd_sock); | |
788 | } | |
789 | if (sock) { | |
790 | close(sock); | |
791 | } | |
792 | ||
793 | unlink(kconsumerd_err_unix_sock_path); | |
794 | unlink(kconsumerd_cmd_unix_sock_path); | |
795 | ||
796 | kconsumerd_pid = 0; | |
1d4b027a DG |
797 | return NULL; |
798 | } | |
799 | ||
800 | /* | |
099e26bd DG |
801 | * Reallocate the apps command pollfd structure of nb_fd size. |
802 | * | |
803 | * The first two fds must be there at all time. | |
804 | */ | |
0177d773 DG |
805 | static int update_apps_cmd_pollfd(unsigned int nb_fd, unsigned int old_nb_fd, |
806 | struct pollfd **pollfd) | |
099e26bd | 807 | { |
0177d773 DG |
808 | int i, count; |
809 | struct pollfd *old_pollfd = NULL; | |
810 | ||
099e26bd DG |
811 | /* Can't accept pollfd less than 2 */ |
812 | if (nb_fd < 2) { | |
813 | goto end; | |
814 | } | |
815 | ||
0177d773 DG |
816 | if (*pollfd) { |
817 | /* Save pointer */ | |
818 | old_pollfd = *pollfd; | |
819 | } | |
820 | ||
821 | *pollfd = malloc(nb_fd * sizeof(struct pollfd)); | |
099e26bd | 822 | if (*pollfd == NULL) { |
0177d773 | 823 | perror("malloc manage apps pollfd"); |
099e26bd DG |
824 | goto error; |
825 | } | |
826 | ||
827 | /* First fd is always the quit pipe */ | |
828 | (*pollfd)[0].fd = thread_quit_pipe[0]; | |
829 | /* Apps command pipe */ | |
830 | (*pollfd)[1].fd = apps_cmd_pipe[0]; | |
831 | (*pollfd)[1].events = POLLIN; | |
832 | ||
0177d773 DG |
833 | /* Start count after the two pipes below */ |
834 | count = 2; | |
835 | for (i = 2; i < old_nb_fd; i++) { | |
836 | /* Add to new pollfd */ | |
837 | if (old_pollfd[i].fd != -1) { | |
838 | (*pollfd)[count].fd = old_pollfd[i].fd; | |
839 | (*pollfd)[count].events = POLLHUP | POLLNVAL | POLLERR; | |
840 | count++; | |
841 | } | |
842 | ||
843 | if (count > nb_fd) { | |
844 | ERR("Updating poll fd wrong size"); | |
845 | goto error; | |
846 | } | |
847 | } | |
848 | ||
849 | /* Destroy old pollfd */ | |
850 | free(old_pollfd); | |
851 | ||
099e26bd DG |
852 | DBG("Apps cmd pollfd realloc of size %d", nb_fd); |
853 | ||
854 | end: | |
855 | return 0; | |
856 | ||
857 | error: | |
0177d773 DG |
858 | /* Destroy old pollfd */ |
859 | free(old_pollfd); | |
099e26bd DG |
860 | return -1; |
861 | } | |
862 | ||
099e26bd DG |
863 | /* |
864 | * This thread manage application communication. | |
1d4b027a DG |
865 | */ |
866 | static void *thread_manage_apps(void *data) | |
099e26bd DG |
867 | { |
868 | int i, ret, count; | |
869 | unsigned int nb_fd = 2; | |
870 | int update_poll_flag = 1; | |
871 | struct pollfd *pollfd = NULL; | |
872 | struct ust_command ust_cmd; | |
873 | ||
874 | DBG("[thread] Manage application started"); | |
875 | ||
876 | ust_cmd.sock = -1; | |
877 | ||
878 | while (1) { | |
879 | /* See if we have a valid socket to add to pollfd */ | |
880 | if (ust_cmd.sock != -1) { | |
881 | nb_fd++; | |
882 | update_poll_flag = 1; | |
883 | } | |
884 | ||
885 | /* The pollfd struct must be updated */ | |
886 | if (update_poll_flag) { | |
0177d773 | 887 | ret = update_apps_cmd_pollfd(nb_fd, ARRAY_SIZE(pollfd), &pollfd); |
099e26bd DG |
888 | if (ret < 0) { |
889 | /* malloc failed so we quit */ | |
890 | goto error; | |
891 | } | |
0177d773 | 892 | |
099e26bd DG |
893 | if (ust_cmd.sock != -1) { |
894 | /* Update pollfd with the new UST socket */ | |
895 | DBG("Adding sock %d to apps cmd pollfd", ust_cmd.sock); | |
896 | pollfd[nb_fd - 1].fd = ust_cmd.sock; | |
0177d773 | 897 | pollfd[nb_fd - 1].events = POLLHUP | POLLNVAL | POLLERR; |
099e26bd DG |
898 | ust_cmd.sock = -1; |
899 | } | |
900 | } | |
901 | ||
902 | DBG("Apps thread polling on %d fds", nb_fd); | |
903 | ||
904 | /* Inifinite blocking call, waiting for transmission */ | |
905 | ret = poll(pollfd, nb_fd, -1); | |
906 | if (ret < 0) { | |
907 | perror("poll apps thread"); | |
908 | goto error; | |
909 | } | |
910 | ||
911 | /* Thread quit pipe has been closed. Killing thread. */ | |
912 | if (pollfd[0].revents == POLLNVAL) { | |
913 | goto error; | |
0177d773 DG |
914 | } else { |
915 | /* apps_cmd_pipe pipe events */ | |
916 | switch (pollfd[1].revents) { | |
917 | case POLLERR: | |
918 | ERR("Apps command pipe poll error"); | |
099e26bd | 919 | goto error; |
0177d773 DG |
920 | case POLLIN: |
921 | /* Empty pipe */ | |
922 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
923 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
924 | perror("read apps cmd pipe"); | |
925 | goto error; | |
926 | } | |
099e26bd | 927 | |
0177d773 DG |
928 | /* Register applicaton to the session daemon */ |
929 | ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock); | |
930 | if (ret < 0) { | |
931 | /* Only critical ENOMEM error can be returned here */ | |
932 | goto error; | |
933 | } | |
099e26bd | 934 | |
0177d773 DG |
935 | ret = ustctl_register_done(ust_cmd.sock); |
936 | if (ret < 0) { | |
937 | /* | |
938 | * If the registration is not possible, we simply unregister | |
939 | * the apps and continue | |
940 | */ | |
941 | unregister_traceable_app(ust_cmd.sock); | |
942 | } | |
943 | break; | |
099e26bd DG |
944 | } |
945 | } | |
946 | ||
947 | count = nb_fd; | |
948 | for (i = 2; i < count; i++) { | |
949 | /* Apps socket is closed/hungup */ | |
950 | switch (pollfd[i].revents) { | |
0177d773 | 951 | case POLLERR: |
099e26bd | 952 | case POLLHUP: |
0177d773 | 953 | case POLLNVAL: |
099e26bd DG |
954 | /* Pipe closed */ |
955 | unregister_traceable_app(pollfd[i].fd); | |
0177d773 DG |
956 | /* Indicate to remove this fd from the pollfd */ |
957 | pollfd[i].fd = -1; | |
099e26bd | 958 | nb_fd--; |
0177d773 | 959 | break; |
099e26bd DG |
960 | } |
961 | } | |
962 | ||
963 | if (nb_fd != count) { | |
964 | update_poll_flag = 1; | |
965 | } | |
966 | } | |
967 | ||
968 | error: | |
969 | DBG("Application communication apps dying"); | |
970 | close(apps_cmd_pipe[0]); | |
971 | close(apps_cmd_pipe[1]); | |
972 | ||
973 | free(pollfd); | |
974 | ||
975 | return NULL; | |
976 | } | |
977 | ||
978 | /* | |
979 | * Dispatch request from the registration threads to the application | |
980 | * communication thread. | |
981 | */ | |
982 | static void *thread_dispatch_ust_registration(void *data) | |
983 | { | |
984 | int ret; | |
985 | struct cds_wfq_node *node; | |
986 | struct ust_command *ust_cmd = NULL; | |
987 | ||
988 | DBG("[thread] Dispatch UST command started"); | |
989 | ||
990 | while (!dispatch_thread_exit) { | |
991 | /* Atomically prepare the queue futex */ | |
992 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
993 | ||
994 | do { | |
995 | /* Dequeue command for registration */ | |
996 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
997 | if (node == NULL) { | |
998 | DBG("Waked up but nothing in the UST command queue"); | |
999 | /* Continue thread execution */ | |
1000 | break; | |
1001 | } | |
1002 | ||
1003 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1004 | ||
2f50c8a3 DG |
1005 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1006 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1007 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1008 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1009 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1010 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1011 | /* |
1012 | * Inform apps thread of the new application registration. This | |
1013 | * call is blocking so we can be assured that the data will be read | |
1014 | * at some point in time or wait to the end of the world :) | |
1015 | */ | |
1016 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1017 | sizeof(struct ust_command)); | |
1018 | if (ret < 0) { | |
1019 | perror("write apps cmd pipe"); | |
1020 | if (errno == EBADF) { | |
1021 | /* | |
1022 | * We can't inform the application thread to process | |
1023 | * registration. We will exit or else application | |
1024 | * registration will not occur and tracing will never | |
1025 | * start. | |
1026 | */ | |
1027 | goto error; | |
1028 | } | |
1029 | } | |
1030 | free(ust_cmd); | |
1031 | } while (node != NULL); | |
1032 | ||
1033 | /* Futex wait on queue. Blocking call on futex() */ | |
1034 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1035 | } | |
1036 | ||
1037 | error: | |
1038 | DBG("Dispatch thread dying"); | |
1039 | return NULL; | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * This thread manage application registration. | |
1044 | */ | |
1045 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1046 | { |
273ea72c DG |
1047 | int sock = 0, ret; |
1048 | struct pollfd pollfd[2]; | |
099e26bd DG |
1049 | /* |
1050 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1051 | * freed in the manage apps thread. | |
1052 | */ | |
1053 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1054 | |
099e26bd | 1055 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1056 | |
1057 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1058 | if (ret < 0) { | |
1059 | goto error; | |
1060 | } | |
1061 | ||
273ea72c DG |
1062 | /* First fd is always the quit pipe */ |
1063 | pollfd[0].fd = thread_quit_pipe[0]; | |
1064 | ||
1065 | /* Apps socket */ | |
1066 | pollfd[1].fd = apps_sock; | |
1067 | pollfd[1].events = POLLIN; | |
1068 | ||
1d4b027a | 1069 | /* Notify all applications to register */ |
099e26bd | 1070 | //notify_apps(default_global_apps_pipe); |
1d4b027a DG |
1071 | |
1072 | while (1) { | |
1073 | DBG("Accepting application registration"); | |
273ea72c DG |
1074 | |
1075 | /* Inifinite blocking call, waiting for transmission */ | |
1076 | ret = poll(pollfd, 2, -1); | |
1077 | if (ret < 0) { | |
099e26bd | 1078 | perror("poll register apps thread"); |
273ea72c DG |
1079 | goto error; |
1080 | } | |
1081 | ||
1082 | /* Thread quit pipe has been closed. Killing thread. */ | |
1083 | if (pollfd[0].revents == POLLNVAL) { | |
1084 | goto error; | |
1085 | } else if (pollfd[1].revents == POLLERR) { | |
099e26bd | 1086 | ERR("Register apps socket poll error"); |
273ea72c DG |
1087 | goto error; |
1088 | } | |
1089 | ||
1d4b027a DG |
1090 | sock = lttcomm_accept_unix_sock(apps_sock); |
1091 | if (sock < 0) { | |
1092 | goto error; | |
1093 | } | |
1094 | ||
099e26bd DG |
1095 | /* Create UST registration command for enqueuing */ |
1096 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1097 | if (ust_cmd == NULL) { | |
1098 | perror("ust command malloc"); | |
1099 | goto error; | |
1100 | } | |
1101 | ||
273ea72c | 1102 | /* |
099e26bd DG |
1103 | * Using message-based transmissions to ensure we don't have to deal |
1104 | * with partially received messages. | |
1d4b027a | 1105 | */ |
099e26bd DG |
1106 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1107 | sizeof(struct ust_register_msg)); | |
2f50c8a3 DG |
1108 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { |
1109 | if (ret < 0) { | |
1110 | perror("lttcomm_recv_unix_sock register apps"); | |
1111 | } else { | |
1112 | ERR("Wrong size received on apps register"); | |
1113 | } | |
099e26bd DG |
1114 | free(ust_cmd); |
1115 | close(sock); | |
1d4b027a DG |
1116 | continue; |
1117 | } | |
1118 | ||
099e26bd DG |
1119 | ust_cmd->sock = sock; |
1120 | ||
2f50c8a3 DG |
1121 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1122 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1123 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1124 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1125 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1126 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1127 | /* |
1128 | * Lock free enqueue the registration request. | |
1129 | * The red pill has been taken! This apps will be part of the *system* | |
1130 | */ | |
1131 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1132 | ||
1133 | /* | |
1134 | * Wake the registration queue futex. | |
1135 | * Implicit memory barrier with the exchange in cds_wfq_enqueue. | |
1136 | */ | |
1137 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1d4b027a DG |
1138 | } |
1139 | ||
1140 | error: | |
099e26bd | 1141 | DBG("Register apps thread dying"); |
273ea72c DG |
1142 | if (apps_sock) { |
1143 | close(apps_sock); | |
1144 | } | |
1145 | if (sock) { | |
1146 | close(sock); | |
1147 | } | |
1d4b027a | 1148 | |
273ea72c | 1149 | unlink(apps_unix_sock_path); |
1d4b027a DG |
1150 | return NULL; |
1151 | } | |
1152 | ||
8c0faa1d | 1153 | /* |
d063d709 DG |
1154 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1155 | * exec or it will fails. | |
8c0faa1d | 1156 | */ |
693bd40b | 1157 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1158 | { |
1159 | int ret; | |
1160 | ||
1161 | /* Setup semaphore */ | |
1162 | sem_init(&kconsumerd_sem, 0, 0); | |
1163 | ||
1d4b027a | 1164 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
1165 | if (ret != 0) { |
1166 | perror("pthread_create kconsumerd"); | |
1167 | goto error; | |
1168 | } | |
1169 | ||
693bd40b | 1170 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1171 | sem_wait(&kconsumerd_sem); |
1172 | ||
712ea556 DG |
1173 | if (kconsumerd_pid == 0) { |
1174 | ERR("Kconsumerd did not start"); | |
1175 | goto error; | |
1176 | } | |
1177 | ||
8c0faa1d DG |
1178 | return 0; |
1179 | ||
1180 | error: | |
712ea556 | 1181 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1182 | return ret; |
1183 | } | |
1184 | ||
d9800920 DG |
1185 | /* |
1186 | * Join kernel consumer thread | |
1187 | */ | |
cf3af59e MD |
1188 | static int join_kconsumerd_thread(void) |
1189 | { | |
1190 | void *status; | |
1191 | int ret; | |
1192 | ||
1193 | if (kconsumerd_pid != 0) { | |
1194 | ret = kill(kconsumerd_pid, SIGTERM); | |
1195 | if (ret) { | |
1196 | ERR("Error killing kconsumerd"); | |
1197 | return ret; | |
1198 | } | |
1199 | return pthread_join(kconsumerd_thread, &status); | |
1200 | } else { | |
1201 | return 0; | |
1202 | } | |
1203 | } | |
1204 | ||
8c0faa1d | 1205 | /* |
d063d709 | 1206 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1207 | * |
d063d709 | 1208 | * Return pid if successful else -1. |
8c0faa1d | 1209 | */ |
693bd40b | 1210 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1211 | { |
1212 | int ret; | |
1213 | pid_t pid; | |
53086306 | 1214 | const char *verbosity; |
8c0faa1d | 1215 | |
c49dc785 DG |
1216 | DBG("Spawning kconsumerd"); |
1217 | ||
8c0faa1d DG |
1218 | pid = fork(); |
1219 | if (pid == 0) { | |
1220 | /* | |
1221 | * Exec kconsumerd. | |
1222 | */ | |
31f73cc9 | 1223 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1224 | verbosity = "--verbose"; |
1225 | } else { | |
1226 | verbosity = "--quiet"; | |
1227 | } | |
1228 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1229 | if (errno != 0) { |
1230 | perror("kernel start consumer exec"); | |
1231 | } | |
1232 | exit(EXIT_FAILURE); | |
1233 | } else if (pid > 0) { | |
1234 | ret = pid; | |
1235 | goto error; | |
1236 | } else { | |
1237 | perror("kernel start consumer fork"); | |
1238 | ret = -errno; | |
1239 | goto error; | |
1240 | } | |
1241 | ||
1242 | error: | |
1243 | return ret; | |
1244 | } | |
1245 | ||
693bd40b | 1246 | /* |
d063d709 | 1247 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1248 | */ |
1249 | static int start_kconsumerd(void) | |
1250 | { | |
1251 | int ret; | |
1252 | ||
693bd40b | 1253 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1254 | if (kconsumerd_pid != 0) { |
817153bb | 1255 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1256 | goto end; |
1257 | } | |
693bd40b | 1258 | |
c49dc785 DG |
1259 | ret = spawn_kconsumerd(); |
1260 | if (ret < 0) { | |
1261 | ERR("Spawning kconsumerd failed"); | |
1262 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1263 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1264 | goto error; | |
693bd40b | 1265 | } |
c49dc785 DG |
1266 | |
1267 | /* Setting up the global kconsumerd_pid */ | |
1268 | kconsumerd_pid = ret; | |
693bd40b DG |
1269 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1270 | ||
6f61d021 DG |
1271 | DBG("Kconsumerd pid %d", ret); |
1272 | ||
693bd40b | 1273 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1274 | ret = spawn_kconsumerd_thread(); |
1275 | if (ret < 0) { | |
1276 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1277 | goto error; |
1278 | } | |
1279 | ||
c49dc785 | 1280 | end: |
693bd40b DG |
1281 | return 0; |
1282 | ||
1283 | error: | |
1284 | return ret; | |
1285 | } | |
1286 | ||
b73401da | 1287 | /* |
d063d709 | 1288 | * modprobe_kernel_modules |
b73401da DG |
1289 | */ |
1290 | static int modprobe_kernel_modules(void) | |
1291 | { | |
ab147185 | 1292 | int ret = 0, i; |
b73401da DG |
1293 | char modprobe[256]; |
1294 | ||
ab147185 MD |
1295 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1296 | ret = snprintf(modprobe, sizeof(modprobe), | |
1297 | "/sbin/modprobe %s%s", | |
1298 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1299 | kernel_modules_list[i].name); | |
b73401da DG |
1300 | if (ret < 0) { |
1301 | perror("snprintf modprobe"); | |
1302 | goto error; | |
1303 | } | |
ab147185 | 1304 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1305 | ret = system(modprobe); |
ab147185 MD |
1306 | if (ret == -1) { |
1307 | ERR("Unable to launch modprobe for module %s", | |
1308 | kernel_modules_list[i].name); | |
1309 | } else if (kernel_modules_list[i].required | |
d9800920 | 1310 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1311 | ERR("Unable to load module %s", |
1312 | kernel_modules_list[i].name); | |
1313 | } else { | |
1314 | DBG("Modprobe successfully %s", | |
1315 | kernel_modules_list[i].name); | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | error: | |
1320 | return ret; | |
1321 | } | |
1322 | ||
1323 | /* | |
1324 | * modprobe_remove_kernel_modules | |
1325 | * Remove modules in reverse load order. | |
1326 | */ | |
1327 | static int modprobe_remove_kernel_modules(void) | |
1328 | { | |
1329 | int ret = 0, i; | |
1330 | char modprobe[256]; | |
1331 | ||
1332 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
1333 | ret = snprintf(modprobe, sizeof(modprobe), | |
1334 | "/sbin/modprobe --remove --quiet %s", | |
1335 | kernel_modules_list[i].name); | |
b73401da | 1336 | if (ret < 0) { |
ab147185 MD |
1337 | perror("snprintf modprobe --remove"); |
1338 | goto error; | |
1339 | } | |
1340 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
1341 | ret = system(modprobe); | |
1342 | if (ret == -1) { | |
1343 | ERR("Unable to launch modprobe --remove for module %s", | |
1344 | kernel_modules_list[i].name); | |
1345 | } else if (kernel_modules_list[i].required | |
d9800920 | 1346 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1347 | ERR("Unable to remove module %s", |
1348 | kernel_modules_list[i].name); | |
1349 | } else { | |
1350 | DBG("Modprobe removal successful %s", | |
1351 | kernel_modules_list[i].name); | |
b73401da | 1352 | } |
b73401da DG |
1353 | } |
1354 | ||
1355 | error: | |
1356 | return ret; | |
1357 | } | |
1358 | ||
1359 | /* | |
d063d709 | 1360 | * mount_debugfs |
b73401da DG |
1361 | */ |
1362 | static int mount_debugfs(char *path) | |
1363 | { | |
1364 | int ret; | |
1365 | char *type = "debugfs"; | |
1366 | ||
996b65c8 | 1367 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1368 | if (ret < 0) { |
1369 | goto error; | |
1370 | } | |
1371 | ||
1372 | ret = mount(type, path, type, 0, NULL); | |
1373 | if (ret < 0) { | |
1374 | perror("mount debugfs"); | |
1375 | goto error; | |
1376 | } | |
1377 | ||
1378 | DBG("Mounted debugfs successfully at %s", path); | |
1379 | ||
1380 | error: | |
1381 | return ret; | |
1382 | } | |
1383 | ||
8c0faa1d | 1384 | /* |
d063d709 | 1385 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1386 | */ |
f3ed775e | 1387 | static void init_kernel_tracer(void) |
8c0faa1d | 1388 | { |
b73401da DG |
1389 | int ret; |
1390 | char *proc_mounts = "/proc/mounts"; | |
1391 | char line[256]; | |
1392 | char *debugfs_path = NULL, *lttng_path; | |
1393 | FILE *fp; | |
1394 | ||
1395 | /* Detect debugfs */ | |
1396 | fp = fopen(proc_mounts, "r"); | |
1397 | if (fp == NULL) { | |
1398 | ERR("Unable to probe %s", proc_mounts); | |
1399 | goto error; | |
1400 | } | |
1401 | ||
1402 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1403 | if (strstr(line, "debugfs") != NULL) { | |
1404 | /* Remove first string */ | |
1405 | strtok(line, " "); | |
1406 | /* Dup string here so we can reuse line later on */ | |
1407 | debugfs_path = strdup(strtok(NULL, " ")); | |
1408 | DBG("Got debugfs path : %s", debugfs_path); | |
1409 | break; | |
1410 | } | |
1411 | } | |
1412 | ||
1413 | fclose(fp); | |
1414 | ||
1415 | /* Mount debugfs if needded */ | |
1416 | if (debugfs_path == NULL) { | |
1417 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1418 | if (ret < 0) { | |
1419 | perror("asprintf debugfs path"); | |
1420 | goto error; | |
1421 | } | |
1422 | ret = mount_debugfs(debugfs_path); | |
1423 | if (ret < 0) { | |
1424 | goto error; | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | /* Modprobe lttng kernel modules */ | |
1429 | ret = modprobe_kernel_modules(); | |
1430 | if (ret < 0) { | |
1431 | goto error; | |
1432 | } | |
1433 | ||
1434 | /* Setup lttng kernel path */ | |
1435 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1436 | if (ret < 0) { | |
1437 | perror("asprintf lttng path"); | |
1438 | goto error; | |
1439 | } | |
1440 | ||
1441 | /* Open debugfs lttng */ | |
1442 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1443 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1444 | DBG("Failed to open %s", lttng_path); |
1445 | goto error; | |
8c0faa1d DG |
1446 | } |
1447 | ||
b73401da DG |
1448 | free(lttng_path); |
1449 | free(debugfs_path); | |
f3ed775e | 1450 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1451 | return; |
1452 | ||
1453 | error: | |
1454 | if (lttng_path) { | |
1455 | free(lttng_path); | |
1456 | } | |
1457 | if (debugfs_path) { | |
1458 | free(debugfs_path); | |
1459 | } | |
1460 | WARN("No kernel tracer available"); | |
1461 | kernel_tracer_fd = 0; | |
1462 | return; | |
f3ed775e | 1463 | } |
33a2b854 | 1464 | |
f3ed775e | 1465 | /* |
d063d709 DG |
1466 | * Start tracing by creating trace directory and sending FDs to the kernel |
1467 | * consumer. | |
f3ed775e DG |
1468 | */ |
1469 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1470 | { | |
f40799e8 | 1471 | int ret = 0; |
8c0faa1d | 1472 | |
f3ed775e | 1473 | if (session->kconsumer_fds_sent == 0) { |
d9800920 DG |
1474 | /* |
1475 | * Assign default kernel consumer if no consumer assigned to the kernel | |
1476 | * session. At this point, it's NOT suppose to be 0 but this is an extra | |
1477 | * security check. | |
1478 | */ | |
1479 | if (session->consumer_fd == 0) { | |
1480 | session->consumer_fd = kconsumerd_cmd_sock; | |
1481 | } | |
1482 | ||
1483 | ret = send_kconsumerd_fds(session); | |
f3ed775e DG |
1484 | if (ret < 0) { |
1485 | ERR("Send kconsumerd fds failed"); | |
1486 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1487 | goto error; | |
1488 | } | |
1d4b027a | 1489 | |
f3ed775e DG |
1490 | session->kconsumer_fds_sent = 1; |
1491 | } | |
1d4b027a DG |
1492 | |
1493 | error: | |
1494 | return ret; | |
8c0faa1d DG |
1495 | } |
1496 | ||
7a485870 DG |
1497 | /* |
1498 | * Notify kernel thread to update it's pollfd. | |
1499 | */ | |
1500 | static int notify_kernel_pollfd(void) | |
1501 | { | |
1502 | int ret; | |
1503 | ||
1504 | /* Inform kernel thread of the new kernel channel */ | |
1505 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1506 | if (ret < 0) { | |
1507 | perror("write kernel poll pipe"); | |
1508 | } | |
1509 | ||
1510 | return ret; | |
1511 | } | |
1512 | ||
8c0faa1d | 1513 | /* |
d063d709 | 1514 | * Allocate a channel structure and fill it. |
8c0faa1d | 1515 | */ |
b389abbe MD |
1516 | static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type, |
1517 | char *name) | |
8c0faa1d | 1518 | { |
f3ed775e | 1519 | struct lttng_channel *chan; |
1d4b027a | 1520 | |
f3ed775e DG |
1521 | chan = malloc(sizeof(struct lttng_channel)); |
1522 | if (chan == NULL) { | |
1523 | perror("init channel malloc"); | |
1524 | goto error; | |
8c0faa1d | 1525 | } |
1d4b027a | 1526 | |
ed8f384d | 1527 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1528 | perror("snprintf channel name"); |
b389abbe | 1529 | goto error; |
f3ed775e DG |
1530 | } |
1531 | ||
1532 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
f3ed775e DG |
1533 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
1534 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1d4b027a | 1535 | |
b389abbe MD |
1536 | switch (domain_type) { |
1537 | case LTTNG_DOMAIN_KERNEL: | |
1538 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
1539 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
1540 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1541 | break; | |
1542 | /* TODO: add UST */ | |
1543 | default: | |
1544 | goto error; /* Not implemented */ | |
1545 | } | |
1546 | ||
f3ed775e | 1547 | return chan; |
b389abbe MD |
1548 | |
1549 | error: | |
1550 | free(chan); | |
1551 | return NULL; | |
8c0faa1d DG |
1552 | } |
1553 | ||
0177d773 DG |
1554 | /* |
1555 | * Create an UST session and add it to the session ust list. | |
1556 | */ | |
1557 | static int create_ust_session(pid_t pid, struct ltt_session *session) | |
1558 | { | |
1559 | int ret = -1; | |
1560 | struct ltt_ust_session *lus; | |
1561 | ||
1562 | DBG("Creating UST session"); | |
1563 | ||
1564 | lus = trace_ust_create_session(session->path, pid); | |
1565 | if (lus == NULL) { | |
1566 | goto error; | |
1567 | } | |
1568 | ||
1569 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1570 | geteuid(), allowed_group()); | |
1571 | if (ret < 0) { | |
1572 | if (ret != -EEXIST) { | |
1573 | ERR("Trace directory creation error"); | |
1574 | goto error; | |
1575 | } | |
1576 | } | |
1577 | ||
1578 | /* Create session on the UST tracer */ | |
1579 | ret = ustctl_create_session(lus); | |
1580 | if (ret < 0) { | |
1581 | goto error; | |
1582 | } | |
1583 | ||
1584 | return 0; | |
1585 | ||
1586 | error: | |
1587 | free(lus); | |
1588 | return ret; | |
1589 | } | |
1590 | ||
333f285e | 1591 | /* |
d063d709 | 1592 | * Create a kernel tracer session then create the default channel. |
333f285e | 1593 | */ |
f3ed775e | 1594 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1595 | { |
f3ed775e | 1596 | int ret; |
f3ed775e DG |
1597 | |
1598 | DBG("Creating kernel session"); | |
1599 | ||
1600 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1601 | if (ret < 0) { | |
1602 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1603 | goto error; | |
333f285e DG |
1604 | } |
1605 | ||
d9800920 DG |
1606 | /* Set kernel consumer socket fd */ |
1607 | if (kconsumerd_cmd_sock) { | |
1608 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1609 | } | |
1610 | ||
63053e7c DG |
1611 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1612 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1613 | if (ret < 0) { |
996b65c8 | 1614 | if (ret != -EEXIST) { |
7a485870 DG |
1615 | ERR("Trace directory creation error"); |
1616 | goto error; | |
1617 | } | |
1618 | } | |
1619 | ||
f3ed775e DG |
1620 | error: |
1621 | return ret; | |
333f285e DG |
1622 | } |
1623 | ||
6c9cc2ab DG |
1624 | /* |
1625 | * Using the session list, filled a lttng_session array to send back to the | |
1626 | * client for session listing. | |
1627 | * | |
1628 | * The session list lock MUST be acquired before calling this function. Use | |
1629 | * lock_session_list() and unlock_session_list(). | |
1630 | */ | |
1631 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1632 | { | |
1633 | int i = 0; | |
1634 | struct ltt_session *session; | |
1635 | ||
1636 | DBG("Getting all available session"); | |
1637 | /* | |
1638 | * Iterate over session list and append data after the control struct in | |
1639 | * the buffer. | |
1640 | */ | |
1641 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1642 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1643 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1644 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1645 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1646 | i++; |
1647 | } | |
1648 | } | |
1649 | ||
9f19cc17 DG |
1650 | /* |
1651 | * Fill lttng_channel array of all channels. | |
1652 | */ | |
1653 | static void list_lttng_channels(struct ltt_session *session, | |
1654 | struct lttng_channel *channels) | |
1655 | { | |
1656 | int i = 0; | |
1657 | struct ltt_kernel_channel *kchan; | |
1658 | ||
1659 | DBG("Listing channels for session %s", session->name); | |
1660 | ||
1661 | /* Kernel channels */ | |
1662 | if (session->kernel_session != NULL) { | |
1663 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1664 | /* Copy lttng_channel struct to array */ | |
1665 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1666 | channels[i].enabled = kchan->enabled; | |
1667 | i++; | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | /* TODO: Missing UST listing */ | |
1672 | } | |
1673 | ||
1674 | /* | |
1675 | * Fill lttng_event array of all events in the channel. | |
1676 | */ | |
1677 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1678 | struct lttng_event *events) | |
1679 | { | |
1680 | /* | |
1681 | * TODO: This is ONLY kernel. Need UST support. | |
1682 | */ | |
1683 | int i = 0; | |
1684 | struct ltt_kernel_event *event; | |
1685 | ||
1686 | DBG("Listing events for channel %s", kchan->channel->name); | |
1687 | ||
1688 | /* Kernel channels */ | |
1689 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1690 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1691 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1692 | events[i].enabled = event->enabled; |
1693 | switch (event->event->instrumentation) { | |
1694 | case LTTNG_KERNEL_TRACEPOINT: | |
1695 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1696 | break; | |
1697 | case LTTNG_KERNEL_KPROBE: | |
1698 | case LTTNG_KERNEL_KRETPROBE: | |
1699 | events[i].type = LTTNG_EVENT_PROBE; | |
1700 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1701 | sizeof(struct lttng_kernel_kprobe)); | |
1702 | break; | |
1703 | case LTTNG_KERNEL_FUNCTION: | |
1704 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1705 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1706 | sizeof(struct lttng_kernel_function)); | |
1707 | break; | |
1708 | } | |
1709 | i++; | |
1710 | } | |
1711 | } | |
1712 | ||
fac6795d | 1713 | /* |
d063d709 DG |
1714 | * Process the command requested by the lttng client within the command |
1715 | * context structure. This function make sure that the return structure (llm) | |
1716 | * is set and ready for transmission before returning. | |
fac6795d | 1717 | * |
e065084a | 1718 | * Return any error encountered or 0 for success. |
fac6795d | 1719 | */ |
5461b305 | 1720 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1721 | { |
f40799e8 | 1722 | int ret = LTTCOMM_OK; |
fac6795d | 1723 | |
5461b305 | 1724 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1725 | |
63053e7c DG |
1726 | /* |
1727 | * Commands that DO NOT need a session. | |
1728 | */ | |
5461b305 | 1729 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1730 | case LTTNG_CREATE_SESSION: |
1731 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1732 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1733 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1734 | break; |
1735 | default: | |
42abccdb DG |
1736 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1737 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1738 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1739 | /* If session name not found */ |
42abccdb | 1740 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1741 | ret = LTTCOMM_SESS_NOT_FOUND; |
1742 | } else { /* If no session name specified */ | |
1743 | ret = LTTCOMM_SELECT_SESS; | |
1744 | } | |
5461b305 | 1745 | goto error; |
b5541356 DG |
1746 | } else { |
1747 | /* Acquire lock for the session */ | |
1748 | lock_session(cmd_ctx->session); | |
379473d2 | 1749 | } |
5e16da05 | 1750 | break; |
379473d2 DG |
1751 | } |
1752 | ||
f3ed775e | 1753 | /* |
d0254c7c | 1754 | * Check domain type for specific "pre-action". |
f3ed775e | 1755 | */ |
0d0c377a DG |
1756 | switch (cmd_ctx->lsm->domain.type) { |
1757 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1758 | /* Kernel tracer check */ |
20fe2104 | 1759 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1760 | init_kernel_tracer(); |
1761 | if (kernel_tracer_fd == 0) { | |
1762 | ret = LTTCOMM_KERN_NA; | |
1763 | goto error; | |
1764 | } | |
20fe2104 | 1765 | } |
f3ed775e | 1766 | /* Need a session for kernel command */ |
d0254c7c | 1767 | switch (cmd_ctx->lsm->cmd_type) { |
d9800920 | 1768 | case LTTNG_CALIBRATE: |
d0254c7c MD |
1769 | case LTTNG_CREATE_SESSION: |
1770 | case LTTNG_LIST_SESSIONS: | |
1771 | case LTTNG_LIST_TRACEPOINTS: | |
d0254c7c MD |
1772 | break; |
1773 | default: | |
1774 | if (cmd_ctx->session->kernel_session == NULL) { | |
1775 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1776 | if (ret < 0) { |
d0254c7c | 1777 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1778 | goto error; |
1779 | } | |
d0254c7c | 1780 | /* Start the kernel consumer daemon */ |
d9800920 DG |
1781 | if (kconsumerd_pid == 0 && |
1782 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
d0254c7c MD |
1783 | ret = start_kconsumerd(); |
1784 | if (ret < 0) { | |
1785 | goto error; | |
1786 | } | |
1787 | } | |
f3ed775e DG |
1788 | } |
1789 | } | |
0d0c377a DG |
1790 | break; |
1791 | default: | |
1792 | break; | |
20fe2104 DG |
1793 | } |
1794 | ||
fac6795d | 1795 | /* Process by command type */ |
5461b305 | 1796 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1797 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1798 | { |
b579acd9 | 1799 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1800 | |
1801 | /* Setup lttng message with no payload */ | |
1802 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1803 | if (ret < 0) { | |
1804 | goto setup_error; | |
1805 | } | |
1806 | ||
b579acd9 DG |
1807 | switch (cmd_ctx->lsm->domain.type) { |
1808 | case LTTNG_DOMAIN_KERNEL: | |
1809 | /* Create Kernel context */ | |
1810 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1811 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1812 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1813 | strncpy(kctx.u.perf_counter.name, | |
1814 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1815 | LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1816 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
b579acd9 DG |
1817 | |
1818 | /* Add kernel context to kernel tracer. See context.c */ | |
1819 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1820 | cmd_ctx->lsm->u.context.event_name, | |
1821 | cmd_ctx->lsm->u.context.channel_name); | |
1822 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1823 | goto error; |
1824 | } | |
b579acd9 DG |
1825 | break; |
1826 | default: | |
1827 | /* TODO: Userspace tracing */ | |
1828 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1829 | goto error; |
d65106b1 DG |
1830 | } |
1831 | ||
1832 | ret = LTTCOMM_OK; | |
1833 | break; | |
1834 | } | |
0b97ec54 | 1835 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1836 | { |
0b97ec54 | 1837 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1838 | |
1839 | /* Setup lttng message with no payload */ | |
1840 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1841 | if (ret < 0) { | |
1842 | goto setup_error; | |
1843 | } | |
1844 | ||
0b97ec54 DG |
1845 | switch (cmd_ctx->lsm->domain.type) { |
1846 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1847 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
0b97ec54 DG |
1848 | cmd_ctx->session->kernel_session); |
1849 | if (kchan == NULL) { | |
1850 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1851 | goto error; |
0b97ec54 DG |
1852 | } else if (kchan->enabled == 1) { |
1853 | ret = kernel_disable_channel(kchan); | |
1854 | if (ret < 0) { | |
1855 | if (ret != EEXIST) { | |
1856 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1857 | } | |
1858 | goto error; | |
1859 | } | |
26cc6b4e | 1860 | } |
0b97ec54 DG |
1861 | kernel_wait_quiescent(kernel_tracer_fd); |
1862 | break; | |
1863 | default: | |
1864 | /* TODO: Userspace tracing */ | |
1865 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1866 | goto error; | |
26cc6b4e DG |
1867 | } |
1868 | ||
26cc6b4e DG |
1869 | ret = LTTCOMM_OK; |
1870 | break; | |
1871 | } | |
f5177a38 | 1872 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1873 | { |
f5177a38 DG |
1874 | struct ltt_kernel_channel *kchan; |
1875 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1876 | |
1877 | /* Setup lttng message with no payload */ | |
1878 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1879 | if (ret < 0) { | |
1880 | goto setup_error; | |
1881 | } | |
1882 | ||
f5177a38 DG |
1883 | switch (cmd_ctx->lsm->domain.type) { |
1884 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1885 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1886 | cmd_ctx->session->kernel_session); |
1887 | if (kchan == NULL) { | |
1888 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1889 | goto error; |
e953ef25 | 1890 | } |
f5177a38 | 1891 | |
62499ad6 | 1892 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); |
f5177a38 DG |
1893 | if (kevent != NULL) { |
1894 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1895 | kchan->channel->name); | |
1896 | ret = kernel_disable_event(kevent); | |
1897 | if (ret < 0) { | |
1898 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1899 | goto error; | |
1900 | } | |
1901 | } | |
1902 | ||
1903 | kernel_wait_quiescent(kernel_tracer_fd); | |
1904 | break; | |
1905 | default: | |
1906 | /* TODO: Userspace tracing */ | |
1907 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1908 | goto error; | |
e953ef25 DG |
1909 | } |
1910 | ||
19e70852 | 1911 | ret = LTTCOMM_OK; |
e953ef25 DG |
1912 | break; |
1913 | } | |
f5177a38 | 1914 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1915 | { |
f5177a38 DG |
1916 | struct ltt_kernel_channel *kchan; |
1917 | struct ltt_kernel_event *kevent; | |
950131af DG |
1918 | |
1919 | /* Setup lttng message with no payload */ | |
1920 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1921 | if (ret < 0) { | |
1922 | goto setup_error; | |
1923 | } | |
1924 | ||
f5177a38 DG |
1925 | switch (cmd_ctx->lsm->domain.type) { |
1926 | case LTTNG_DOMAIN_KERNEL: | |
1927 | DBG("Disabling all enabled kernel events"); | |
62499ad6 | 1928 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1929 | cmd_ctx->session->kernel_session); |
1930 | if (kchan == NULL) { | |
1931 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1932 | goto error; | |
1933 | } | |
950131af | 1934 | |
f5177a38 DG |
1935 | /* For each event in the kernel session */ |
1936 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1937 | DBG("Disabling kernel event %s for channel %s.", | |
1938 | kevent->event->name, kchan->channel->name); | |
1939 | ret = kernel_disable_event(kevent); | |
1940 | if (ret < 0) { | |
1941 | continue; | |
1942 | } | |
950131af | 1943 | } |
f5177a38 DG |
1944 | |
1945 | /* Quiescent wait after event disable */ | |
1946 | kernel_wait_quiescent(kernel_tracer_fd); | |
1947 | break; | |
1948 | default: | |
1949 | /* TODO: Userspace tracing */ | |
1950 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1951 | goto error; | |
950131af DG |
1952 | } |
1953 | ||
950131af DG |
1954 | ret = LTTCOMM_OK; |
1955 | break; | |
1956 | } | |
0d0c377a | 1957 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 1958 | { |
0d0c377a | 1959 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
1960 | |
1961 | /* Setup lttng message with no payload */ | |
1962 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1963 | if (ret < 0) { | |
1964 | goto setup_error; | |
1965 | } | |
1966 | ||
0d0c377a DG |
1967 | switch (cmd_ctx->lsm->domain.type) { |
1968 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1969 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, |
0d0c377a DG |
1970 | cmd_ctx->session->kernel_session); |
1971 | if (kchan == NULL) { | |
1972 | /* Channel not found, creating it */ | |
1973 | DBG("Creating kernel channel"); | |
7d29a247 | 1974 | |
0d0c377a | 1975 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c DG |
1976 | &cmd_ctx->lsm->u.channel.chan, |
1977 | cmd_ctx->session->kernel_session->trace_path); | |
0d0c377a DG |
1978 | if (ret < 0) { |
1979 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1980 | goto error; | |
1981 | } | |
7d29a247 | 1982 | |
0d0c377a DG |
1983 | /* Notify kernel thread that there is a new channel */ |
1984 | ret = notify_kernel_pollfd(); | |
1985 | if (ret < 0) { | |
1986 | ret = LTTCOMM_FATAL; | |
1987 | goto error; | |
1988 | } | |
1989 | } else if (kchan->enabled == 0) { | |
1990 | ret = kernel_enable_channel(kchan); | |
1991 | if (ret < 0) { | |
1992 | if (ret != EEXIST) { | |
1993 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
1994 | } | |
1995 | goto error; | |
d36b8583 | 1996 | } |
d36b8583 | 1997 | } |
0d0c377a DG |
1998 | |
1999 | kernel_wait_quiescent(kernel_tracer_fd); | |
2000 | break; | |
0177d773 DG |
2001 | case LTTNG_DOMAIN_UST_PID: |
2002 | break; | |
0d0c377a | 2003 | default: |
0d0c377a DG |
2004 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2005 | goto error; | |
d36b8583 DG |
2006 | } |
2007 | ||
d36b8583 DG |
2008 | ret = LTTCOMM_OK; |
2009 | break; | |
2010 | } | |
0d0c377a | 2011 | case LTTNG_ENABLE_EVENT: |
894be886 | 2012 | { |
7d29a247 DG |
2013 | char *channel_name; |
2014 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 2015 | struct ltt_kernel_event *kevent; |
7d29a247 | 2016 | struct lttng_channel *chan; |
f3ed775e | 2017 | |
894be886 DG |
2018 | /* Setup lttng message with no payload */ |
2019 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2020 | if (ret < 0) { | |
2021 | goto setup_error; | |
2022 | } | |
2023 | ||
7d29a247 DG |
2024 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2025 | ||
0d0c377a DG |
2026 | switch (cmd_ctx->lsm->domain.type) { |
2027 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2028 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2029 | cmd_ctx->session->kernel_session); |
2030 | if (kchan == NULL) { | |
2031 | DBG("Channel not found. Creating channel %s", channel_name); | |
2032 | ||
2033 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2034 | if (chan == NULL) { | |
2035 | ret = LTTCOMM_FATAL; | |
2036 | goto error; | |
2037 | } | |
2038 | ||
2039 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2040 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2041 | if (ret < 0) { | |
2042 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2043 | goto error; | |
2044 | } | |
62499ad6 | 2045 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2046 | cmd_ctx->session->kernel_session); |
2047 | if (kchan == NULL) { | |
b389abbe MD |
2048 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2049 | channel_name); | |
2050 | ret = LTTCOMM_FATAL; | |
2051 | goto error; | |
7d29a247 | 2052 | } |
b389abbe | 2053 | } |
7d29a247 | 2054 | |
62499ad6 | 2055 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
0d0c377a DG |
2056 | if (kevent == NULL) { |
2057 | DBG("Creating kernel event %s for channel %s.", | |
2058 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
2059 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
2060 | } else { | |
2061 | DBG("Enabling kernel event %s for channel %s.", | |
2062 | kevent->event->name, channel_name); | |
2063 | ret = kernel_enable_event(kevent); | |
2064 | if (ret == -EEXIST) { | |
2065 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
2066 | goto error; |
2067 | } | |
2068 | } | |
f34daff7 | 2069 | |
0d0c377a DG |
2070 | if (ret < 0) { |
2071 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
2072 | goto error; |
2073 | } | |
19e70852 | 2074 | |
0d0c377a DG |
2075 | kernel_wait_quiescent(kernel_tracer_fd); |
2076 | break; | |
2077 | default: | |
2078 | /* TODO: Userspace tracing */ | |
2079 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 2080 | goto error; |
f3ed775e | 2081 | } |
19e70852 | 2082 | ret = LTTCOMM_OK; |
894be886 DG |
2083 | break; |
2084 | } | |
0d0c377a | 2085 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 2086 | { |
9f19cc17 DG |
2087 | int size, i; |
2088 | char *channel_name; | |
7d29a247 | 2089 | struct ltt_kernel_channel *kchan; |
0d0c377a | 2090 | struct ltt_kernel_event *kevent; |
9f19cc17 | 2091 | struct lttng_event *event_list; |
7d29a247 | 2092 | struct lttng_channel *chan; |
33a2b854 DG |
2093 | |
2094 | /* Setup lttng message with no payload */ | |
2095 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2096 | if (ret < 0) { | |
2097 | goto setup_error; | |
2098 | } | |
2099 | ||
2100 | DBG("Enabling all kernel event"); | |
2101 | ||
7d29a247 DG |
2102 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2103 | ||
0d0c377a DG |
2104 | switch (cmd_ctx->lsm->domain.type) { |
2105 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2106 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2107 | cmd_ctx->session->kernel_session); |
2108 | if (kchan == NULL) { | |
2109 | DBG("Channel not found. Creating channel %s", channel_name); | |
2110 | ||
2111 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2112 | if (chan == NULL) { | |
2113 | ret = LTTCOMM_FATAL; | |
2114 | goto error; | |
2115 | } | |
2116 | ||
2117 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2118 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2119 | if (ret < 0) { | |
2120 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2121 | goto error; | |
2122 | } | |
62499ad6 | 2123 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2124 | cmd_ctx->session->kernel_session); |
2125 | if (kchan == NULL) { | |
b389abbe MD |
2126 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2127 | channel_name); | |
2128 | ret = LTTCOMM_FATAL; | |
2129 | goto error; | |
7d29a247 | 2130 | } |
b389abbe | 2131 | } |
7d29a247 | 2132 | |
0d0c377a DG |
2133 | /* For each event in the kernel session */ |
2134 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
2135 | DBG("Enabling kernel event %s for channel %s.", | |
2136 | kevent->event->name, channel_name); | |
2137 | ret = kernel_enable_event(kevent); | |
7d29a247 | 2138 | if (ret < 0) { |
0d0c377a | 2139 | continue; |
7d29a247 DG |
2140 | } |
2141 | } | |
33a2b854 | 2142 | |
0d0c377a DG |
2143 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
2144 | if (size < 0) { | |
2145 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2146 | goto error; | |
f3ed775e | 2147 | } |
f3ed775e | 2148 | |
0d0c377a | 2149 | for (i = 0; i < size; i++) { |
62499ad6 | 2150 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
0d0c377a DG |
2151 | if (kevent == NULL) { |
2152 | /* Default event type for enable all */ | |
2153 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
2154 | /* Enable each single tracepoint event */ | |
2155 | ret = kernel_create_event(&event_list[i], kchan); | |
2156 | if (ret < 0) { | |
2157 | /* Ignore error here and continue */ | |
2158 | } | |
950131af | 2159 | } |
33a2b854 | 2160 | } |
33a2b854 | 2161 | |
0d0c377a DG |
2162 | free(event_list); |
2163 | ||
2164 | /* Quiescent wait after event enable */ | |
2165 | kernel_wait_quiescent(kernel_tracer_fd); | |
2166 | break; | |
2167 | default: | |
2168 | /* TODO: Userspace tracing */ | |
2169 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2170 | goto error; | |
2171 | } | |
33a2b854 DG |
2172 | |
2173 | ret = LTTCOMM_OK; | |
2174 | break; | |
2175 | } | |
052da939 | 2176 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2177 | { |
9f19cc17 | 2178 | struct lttng_event *events; |
052da939 DG |
2179 | ssize_t nb_events = 0; |
2180 | ||
2181 | switch (cmd_ctx->lsm->domain.type) { | |
2182 | case LTTNG_DOMAIN_KERNEL: | |
2183 | DBG("Listing kernel events"); | |
2184 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
2185 | if (nb_events < 0) { | |
2186 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2187 | goto error; | |
2188 | } | |
2189 | break; | |
2190 | default: | |
2191 | /* TODO: Userspace listing */ | |
2192 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2193 | break; | |
2ef84c95 DG |
2194 | } |
2195 | ||
2196 | /* | |
2197 | * Setup lttng message with payload size set to the event list size in | |
2198 | * bytes and then copy list into the llm payload. | |
2199 | */ | |
052da939 | 2200 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2201 | if (ret < 0) { |
052da939 | 2202 | free(events); |
2ef84c95 DG |
2203 | goto setup_error; |
2204 | } | |
2205 | ||
2206 | /* Copy event list into message payload */ | |
9f19cc17 | 2207 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2208 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2209 | |
9f19cc17 | 2210 | free(events); |
2ef84c95 DG |
2211 | |
2212 | ret = LTTCOMM_OK; | |
2213 | break; | |
2214 | } | |
f3ed775e | 2215 | case LTTNG_START_TRACE: |
8c0faa1d DG |
2216 | { |
2217 | struct ltt_kernel_channel *chan; | |
f3ed775e | 2218 | |
8c0faa1d DG |
2219 | /* Setup lttng message with no payload */ |
2220 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2221 | if (ret < 0) { | |
2222 | goto setup_error; | |
2223 | } | |
2224 | ||
f3ed775e DG |
2225 | /* Kernel tracing */ |
2226 | if (cmd_ctx->session->kernel_session != NULL) { | |
2227 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
2228 | DBG("Open kernel metadata"); | |
58a97671 | 2229 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
63053e7c | 2230 | cmd_ctx->session->kernel_session->trace_path); |
f3ed775e DG |
2231 | if (ret < 0) { |
2232 | ret = LTTCOMM_KERN_META_FAIL; | |
2233 | goto error; | |
2234 | } | |
2235 | } | |
8c0faa1d | 2236 | |
f3ed775e DG |
2237 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
2238 | DBG("Opening kernel metadata stream"); | |
2239 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
2240 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
2241 | if (ret < 0) { | |
2242 | ERR("Kernel create metadata stream failed"); | |
2243 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2244 | goto error; | |
2245 | } | |
2246 | } | |
2247 | } | |
8c0faa1d | 2248 | |
f3ed775e | 2249 | /* For each channel */ |
0d0c377a DG |
2250 | cds_list_for_each_entry(chan, |
2251 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
2252 | if (chan->stream_count == 0) { |
2253 | ret = kernel_open_channel_stream(chan); | |
2254 | if (ret < 0) { | |
2255 | ERR("Kernel create channel stream failed"); | |
2256 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2257 | goto error; | |
2258 | } | |
2259 | /* Update the stream global counter */ | |
2260 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
2261 | } | |
2262 | } | |
2263 | ||
283046e0 | 2264 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
8c0faa1d | 2265 | if (ret < 0) { |
f3ed775e | 2266 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2267 | goto error; |
2268 | } | |
8c0faa1d | 2269 | |
283046e0 DG |
2270 | DBG("Start kernel tracing"); |
2271 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
f3ed775e | 2272 | if (ret < 0) { |
283046e0 | 2273 | ERR("Kernel start session failed"); |
f3ed775e | 2274 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2275 | goto error; |
2276 | } | |
8c0faa1d | 2277 | |
f3ed775e DG |
2278 | /* Quiescent wait after starting trace */ |
2279 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2280 | } |
2281 | ||
f3ed775e | 2282 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
2283 | |
2284 | ret = LTTCOMM_OK; | |
2285 | break; | |
2286 | } | |
f3ed775e | 2287 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2288 | { |
f3ed775e | 2289 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
2290 | /* Setup lttng message with no payload */ |
2291 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2292 | if (ret < 0) { | |
2293 | goto setup_error; | |
2294 | } | |
2295 | ||
f3ed775e DG |
2296 | /* Kernel tracer */ |
2297 | if (cmd_ctx->session->kernel_session != NULL) { | |
2298 | DBG("Stop kernel tracing"); | |
84291629 | 2299 | |
f3ed775e DG |
2300 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
2301 | if (ret < 0) { | |
2302 | ERR("Kernel metadata flush failed"); | |
2303 | } | |
8c0faa1d | 2304 | |
f3ed775e DG |
2305 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
2306 | ret = kernel_flush_buffer(chan); | |
2307 | if (ret < 0) { | |
2308 | ERR("Kernel flush buffer error"); | |
2309 | } | |
2310 | } | |
2311 | ||
2312 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
2313 | if (ret < 0) { | |
2314 | ERR("Kernel stop session failed"); | |
2315 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2316 | goto error; | |
2317 | } | |
2318 | ||
2319 | /* Quiescent wait after stopping trace */ | |
2320 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2321 | } |
2322 | ||
f3ed775e | 2323 | /* TODO : User-space tracer */ |
8c0faa1d DG |
2324 | |
2325 | ret = LTTCOMM_OK; | |
2326 | break; | |
2327 | } | |
5e16da05 MD |
2328 | case LTTNG_CREATE_SESSION: |
2329 | { | |
5461b305 DG |
2330 | /* Setup lttng message with no payload */ |
2331 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2332 | if (ret < 0) { | |
2333 | goto setup_error; | |
2334 | } | |
2335 | ||
42abccdb | 2336 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
5e16da05 | 2337 | if (ret < 0) { |
f3ed775e | 2338 | if (ret == -EEXIST) { |
5e16da05 MD |
2339 | ret = LTTCOMM_EXIST_SESS; |
2340 | } else { | |
aaf97519 | 2341 | ret = LTTCOMM_FATAL; |
aaf97519 | 2342 | } |
5461b305 | 2343 | goto error; |
8028d920 | 2344 | } |
1657e9bb | 2345 | |
5461b305 | 2346 | ret = LTTCOMM_OK; |
5e16da05 MD |
2347 | break; |
2348 | } | |
2349 | case LTTNG_DESTROY_SESSION: | |
2350 | { | |
5461b305 DG |
2351 | /* Setup lttng message with no payload */ |
2352 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2353 | if (ret < 0) { | |
2354 | goto setup_error; | |
2355 | } | |
2356 | ||
f3ed775e DG |
2357 | /* Clean kernel session teardown */ |
2358 | teardown_kernel_session(cmd_ctx->session); | |
2359 | ||
42abccdb | 2360 | ret = destroy_session(cmd_ctx->lsm->session.name); |
5e16da05 | 2361 | if (ret < 0) { |
f3ed775e | 2362 | ret = LTTCOMM_FATAL; |
5461b305 | 2363 | goto error; |
5e16da05 | 2364 | } |
1657e9bb | 2365 | |
7a485870 DG |
2366 | /* |
2367 | * Must notify the kernel thread here to update it's pollfd in order to | |
2368 | * remove the channel(s)' fd just destroyed. | |
2369 | */ | |
2370 | ret = notify_kernel_pollfd(); | |
2371 | if (ret < 0) { | |
2372 | ret = LTTCOMM_FATAL; | |
2373 | goto error; | |
2374 | } | |
2375 | ||
5461b305 DG |
2376 | ret = LTTCOMM_OK; |
2377 | break; | |
5e16da05 | 2378 | } |
9f19cc17 | 2379 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2380 | { |
4b222185 | 2381 | size_t nb_dom = 0; |
5461b305 | 2382 | |
9f19cc17 DG |
2383 | if (cmd_ctx->session->kernel_session != NULL) { |
2384 | nb_dom++; | |
ce3d728c | 2385 | } |
520ff687 | 2386 | |
0177d773 | 2387 | nb_dom += cmd_ctx->session->ust_session_list.count; |
9f19cc17 DG |
2388 | |
2389 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2390 | if (ret < 0) { |
2391 | goto setup_error; | |
520ff687 | 2392 | } |
57167058 | 2393 | |
9f19cc17 DG |
2394 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2395 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2396 | |
9f19cc17 | 2397 | /* TODO: User-space tracer domain support */ |
5461b305 | 2398 | ret = LTTCOMM_OK; |
5e16da05 MD |
2399 | break; |
2400 | } | |
9f19cc17 | 2401 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2402 | { |
9f19cc17 DG |
2403 | /* |
2404 | * TODO: Only kernel channels are listed here. UST listing | |
2405 | * is needed on lttng-ust 2.0 release. | |
2406 | */ | |
2407 | size_t nb_chan = 0; | |
2408 | if (cmd_ctx->session->kernel_session != NULL) { | |
2409 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2410 | } |
ca95a216 | 2411 | |
9f19cc17 DG |
2412 | ret = setup_lttng_msg(cmd_ctx, |
2413 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2414 | if (ret < 0) { |
2415 | goto setup_error; | |
2416 | } | |
9f19cc17 DG |
2417 | |
2418 | list_lttng_channels(cmd_ctx->session, | |
2419 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2420 | ||
2421 | ret = LTTCOMM_OK; | |
5461b305 | 2422 | break; |
5e16da05 | 2423 | } |
9f19cc17 | 2424 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2425 | { |
9f19cc17 DG |
2426 | /* |
2427 | * TODO: Only kernel events are listed here. UST listing | |
2428 | * is needed on lttng-ust 2.0 release. | |
2429 | */ | |
2430 | size_t nb_event = 0; | |
2431 | struct ltt_kernel_channel *kchan = NULL; | |
2432 | ||
2433 | if (cmd_ctx->session->kernel_session != NULL) { | |
62499ad6 | 2434 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.list.channel_name, |
9f19cc17 DG |
2435 | cmd_ctx->session->kernel_session); |
2436 | if (kchan == NULL) { | |
2437 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2438 | goto error; | |
2439 | } | |
2440 | nb_event += kchan->event_count; | |
5461b305 | 2441 | } |
ca95a216 | 2442 | |
9f19cc17 DG |
2443 | ret = setup_lttng_msg(cmd_ctx, |
2444 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2445 | if (ret < 0) { |
2446 | goto setup_error; | |
2447 | } | |
9f19cc17 | 2448 | |
ced2f820 | 2449 | DBG("Listing events (%zu events)", nb_event); |
9f19cc17 DG |
2450 | |
2451 | list_lttng_events(kchan, | |
2452 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2453 | ||
2454 | ret = LTTCOMM_OK; | |
5461b305 | 2455 | break; |
5e16da05 MD |
2456 | } |
2457 | case LTTNG_LIST_SESSIONS: | |
2458 | { | |
6c9cc2ab | 2459 | lock_session_list(); |
5461b305 | 2460 | |
6c9cc2ab | 2461 | if (session_list_ptr->count == 0) { |
f3ed775e | 2462 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2463 | unlock_session_list(); |
5461b305 | 2464 | goto error; |
57167058 | 2465 | } |
5e16da05 | 2466 | |
6c9cc2ab DG |
2467 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2468 | session_list_ptr->count); | |
5461b305 | 2469 | if (ret < 0) { |
36a83748 | 2470 | unlock_session_list(); |
5461b305 | 2471 | goto setup_error; |
e065084a | 2472 | } |
5e16da05 | 2473 | |
6c9cc2ab DG |
2474 | /* Filled the session array */ |
2475 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2476 | ||
2477 | unlock_session_list(); | |
5e16da05 | 2478 | |
5461b305 | 2479 | ret = LTTCOMM_OK; |
5e16da05 MD |
2480 | break; |
2481 | } | |
d0254c7c MD |
2482 | case LTTNG_CALIBRATE: |
2483 | { | |
2484 | /* Setup lttng message with no payload */ | |
2485 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2486 | if (ret < 0) { | |
2487 | goto setup_error; | |
2488 | } | |
2489 | ||
2490 | switch (cmd_ctx->lsm->domain.type) { | |
2491 | case LTTNG_DOMAIN_KERNEL: | |
2492 | { | |
2493 | struct lttng_kernel_calibrate kcalibrate; | |
2494 | ||
2495 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2496 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2497 | if (ret < 0) { | |
2498 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2499 | goto error; | |
2500 | } | |
2501 | break; | |
2502 | } | |
2503 | default: | |
2504 | /* TODO: Userspace tracing */ | |
2505 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2506 | goto error; | |
2507 | } | |
2508 | ret = LTTCOMM_OK; | |
2509 | break; | |
2510 | } | |
d9800920 DG |
2511 | case LTTNG_REGISTER_CONSUMER: |
2512 | { | |
2513 | int sock; | |
2514 | ||
2515 | /* Setup lttng message with no payload */ | |
2516 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2517 | if (ret < 0) { | |
2518 | goto setup_error; | |
2519 | } | |
2520 | ||
2521 | switch (cmd_ctx->lsm->domain.type) { | |
2522 | case LTTNG_DOMAIN_KERNEL: | |
2523 | { | |
2524 | /* Can't register a consumer if there is already one */ | |
2525 | if (cmd_ctx->session->kernel_session->consumer_fd != 0) { | |
2526 | ret = LTTCOMM_CONNECT_FAIL; | |
2527 | goto error; | |
2528 | } | |
2529 | ||
2530 | sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path); | |
2531 | if (sock < 0) { | |
2532 | ret = LTTCOMM_CONNECT_FAIL; | |
2533 | goto error; | |
2534 | } | |
2535 | ||
2536 | cmd_ctx->session->kernel_session->consumer_fd = sock; | |
2537 | break; | |
2538 | } | |
2539 | default: | |
2540 | /* TODO: Userspace tracing */ | |
2541 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2542 | goto error; | |
2543 | } | |
2544 | ||
2545 | ret = LTTCOMM_OK; | |
2546 | break; | |
2547 | } | |
d0254c7c | 2548 | |
5e16da05 MD |
2549 | default: |
2550 | /* Undefined command */ | |
5461b305 DG |
2551 | ret = setup_lttng_msg(cmd_ctx, 0); |
2552 | if (ret < 0) { | |
2553 | goto setup_error; | |
2554 | } | |
2555 | ||
5e16da05 | 2556 | ret = LTTCOMM_UND; |
5461b305 | 2557 | break; |
fac6795d DG |
2558 | } |
2559 | ||
5461b305 DG |
2560 | /* Set return code */ |
2561 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2562 | |
b5541356 DG |
2563 | if (cmd_ctx->session) { |
2564 | unlock_session(cmd_ctx->session); | |
2565 | } | |
2566 | ||
e065084a DG |
2567 | return ret; |
2568 | ||
5461b305 | 2569 | error: |
5461b305 DG |
2570 | if (cmd_ctx->llm == NULL) { |
2571 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2572 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2573 | goto setup_error; |
2574 | } | |
2575 | } | |
e065084a | 2576 | /* Notify client of error */ |
5461b305 | 2577 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2578 | |
5461b305 | 2579 | setup_error: |
b5541356 DG |
2580 | if (cmd_ctx->session) { |
2581 | unlock_session(cmd_ctx->session); | |
2582 | } | |
8028d920 | 2583 | return ret; |
fac6795d DG |
2584 | } |
2585 | ||
1d4b027a | 2586 | /* |
d063d709 DG |
2587 | * This thread manage all clients request using the unix client socket for |
2588 | * communication. | |
1d4b027a DG |
2589 | */ |
2590 | static void *thread_manage_clients(void *data) | |
2591 | { | |
273ea72c DG |
2592 | int sock = 0, ret; |
2593 | struct command_ctx *cmd_ctx = NULL; | |
2594 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2595 | |
2596 | DBG("[thread] Manage client started"); | |
2597 | ||
2598 | ret = lttcomm_listen_unix_sock(client_sock); | |
2599 | if (ret < 0) { | |
2600 | goto error; | |
2601 | } | |
2602 | ||
273ea72c DG |
2603 | /* First fd is always the quit pipe */ |
2604 | pollfd[0].fd = thread_quit_pipe[0]; | |
2605 | ||
2606 | /* Apps socket */ | |
2607 | pollfd[1].fd = client_sock; | |
2608 | pollfd[1].events = POLLIN; | |
2609 | ||
1d4b027a DG |
2610 | /* Notify parent pid that we are ready |
2611 | * to accept command for client side. | |
2612 | */ | |
2613 | if (opt_sig_parent) { | |
2614 | kill(ppid, SIGCHLD); | |
2615 | } | |
2616 | ||
2617 | while (1) { | |
1d4b027a | 2618 | DBG("Accepting client command ..."); |
273ea72c DG |
2619 | |
2620 | /* Inifinite blocking call, waiting for transmission */ | |
2621 | ret = poll(pollfd, 2, -1); | |
2622 | if (ret < 0) { | |
2623 | perror("poll client thread"); | |
2624 | goto error; | |
2625 | } | |
2626 | ||
2627 | /* Thread quit pipe has been closed. Killing thread. */ | |
2628 | if (pollfd[0].revents == POLLNVAL) { | |
2629 | goto error; | |
2630 | } else if (pollfd[1].revents == POLLERR) { | |
2631 | ERR("Client socket poll error"); | |
2632 | goto error; | |
2633 | } | |
2634 | ||
1d4b027a DG |
2635 | sock = lttcomm_accept_unix_sock(client_sock); |
2636 | if (sock < 0) { | |
2637 | goto error; | |
2638 | } | |
2639 | ||
2640 | /* Allocate context command to process the client request */ | |
2641 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2642 | ||
2643 | /* Allocate data buffer for reception */ | |
2644 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2645 | cmd_ctx->llm = NULL; | |
2646 | cmd_ctx->session = NULL; | |
2647 | ||
2648 | /* | |
2649 | * Data is received from the lttng client. The struct | |
2650 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2651 | * the client. | |
2652 | */ | |
2653 | DBG("Receiving data from client ..."); | |
2654 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2655 | if (ret <= 0) { | |
2656 | continue; | |
2657 | } | |
2658 | ||
f7776ea7 DG |
2659 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2660 | ||
1d4b027a DG |
2661 | /* |
2662 | * This function dispatch the work to the kernel or userspace tracer | |
2663 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2664 | * informations for the client. The command context struct contains | |
2665 | * everything this function may needs. | |
2666 | */ | |
2667 | ret = process_client_msg(cmd_ctx); | |
2668 | if (ret < 0) { | |
2669 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2670 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2671 | /* Error detected but still accept command */ | |
a2fb29a5 | 2672 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2673 | continue; |
2674 | } | |
2675 | ||
2676 | DBG("Sending response (size: %d, retcode: %d)", | |
2677 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2678 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2679 | if (ret < 0) { | |
2680 | ERR("Failed to send data back to client"); | |
2681 | } | |
2682 | ||
a2fb29a5 | 2683 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2684 | |
2685 | /* End of transmission */ | |
2686 | close(sock); | |
1d4b027a DG |
2687 | } |
2688 | ||
2689 | error: | |
273ea72c DG |
2690 | DBG("Client thread dying"); |
2691 | if (client_sock) { | |
2692 | close(client_sock); | |
2693 | } | |
2694 | if (sock) { | |
2695 | close(sock); | |
2696 | } | |
2697 | ||
2698 | unlink(client_unix_sock_path); | |
2699 | ||
a2fb29a5 | 2700 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2701 | return NULL; |
2702 | } | |
2703 | ||
2704 | ||
fac6795d DG |
2705 | /* |
2706 | * usage function on stderr | |
2707 | */ | |
2708 | static void usage(void) | |
2709 | { | |
b716ce68 | 2710 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2711 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2712 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2713 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2714 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2715 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2716 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2717 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2718 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2719 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2720 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2721 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2722 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2723 | } |
2724 | ||
2725 | /* | |
2726 | * daemon argument parsing | |
2727 | */ | |
2728 | static int parse_args(int argc, char **argv) | |
2729 | { | |
2730 | int c; | |
2731 | ||
2732 | static struct option long_options[] = { | |
2733 | { "client-sock", 1, 0, 'c' }, | |
2734 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2735 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2736 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2737 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2738 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2739 | { "help", 0, 0, 'h' }, |
2740 | { "group", 1, 0, 'g' }, | |
2741 | { "version", 0, 0, 'V' }, | |
75462a81 | 2742 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2743 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2744 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2745 | { NULL, 0, 0, 0 } |
2746 | }; | |
2747 | ||
2748 | while (1) { | |
2749 | int option_index = 0; | |
31f73cc9 | 2750 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2751 | if (c == -1) { |
2752 | break; | |
2753 | } | |
2754 | ||
2755 | switch (c) { | |
2756 | case 0: | |
2757 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2758 | if (optarg) { | |
2759 | fprintf(stderr, " with arg %s\n", optarg); | |
2760 | } | |
2761 | break; | |
b716ce68 | 2762 | case 'c': |
fac6795d DG |
2763 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2764 | break; | |
2765 | case 'a': | |
2766 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2767 | break; | |
2768 | case 'd': | |
2769 | opt_daemon = 1; | |
2770 | break; | |
2771 | case 'g': | |
2772 | opt_tracing_group = strdup(optarg); | |
2773 | break; | |
2774 | case 'h': | |
2775 | usage(); | |
2776 | exit(EXIT_FAILURE); | |
2777 | case 'V': | |
2778 | fprintf(stdout, "%s\n", VERSION); | |
2779 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2780 | case 'S': |
2781 | opt_sig_parent = 1; | |
2782 | break; | |
d6f42150 DG |
2783 | case 'E': |
2784 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2785 | break; | |
2786 | case 'C': | |
2787 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2788 | break; | |
75462a81 DG |
2789 | case 'q': |
2790 | opt_quiet = 1; | |
2791 | break; | |
3f9947db | 2792 | case 'v': |
53086306 DG |
2793 | /* Verbose level can increase using multiple -v */ |
2794 | opt_verbose += 1; | |
3f9947db | 2795 | break; |
31f73cc9 MD |
2796 | case 'Z': |
2797 | opt_verbose_kconsumerd += 1; | |
2798 | break; | |
fac6795d DG |
2799 | default: |
2800 | /* Unknown option or other error. | |
2801 | * Error is printed by getopt, just return */ | |
2802 | return -1; | |
2803 | } | |
2804 | } | |
2805 | ||
2806 | return 0; | |
2807 | } | |
2808 | ||
2809 | /* | |
d063d709 | 2810 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2811 | * apps_sock - The communication socket for all UST apps. |
2812 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2813 | */ |
cf3af59e | 2814 | static int init_daemon_socket(void) |
fac6795d DG |
2815 | { |
2816 | int ret = 0; | |
2817 | mode_t old_umask; | |
2818 | ||
2819 | old_umask = umask(0); | |
2820 | ||
2821 | /* Create client tool unix socket */ | |
d6f42150 DG |
2822 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2823 | if (client_sock < 0) { | |
2824 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2825 | ret = -1; |
2826 | goto end; | |
2827 | } | |
2828 | ||
2829 | /* File permission MUST be 660 */ | |
2830 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2831 | if (ret < 0) { | |
d6f42150 | 2832 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2833 | perror("chmod"); |
2834 | goto end; | |
2835 | } | |
2836 | ||
2837 | /* Create the application unix socket */ | |
d6f42150 DG |
2838 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2839 | if (apps_sock < 0) { | |
2840 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2841 | ret = -1; |
2842 | goto end; | |
2843 | } | |
2844 | ||
d6f42150 | 2845 | /* File permission MUST be 666 */ |
fac6795d DG |
2846 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2847 | if (ret < 0) { | |
d6f42150 | 2848 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2849 | perror("chmod"); |
2850 | goto end; | |
2851 | } | |
2852 | ||
2853 | end: | |
2854 | umask(old_umask); | |
2855 | return ret; | |
2856 | } | |
2857 | ||
2858 | /* | |
7d8234d9 MD |
2859 | * Check if the global socket is available, and if a daemon is answering |
2860 | * at the other side. If yes, error is returned. | |
fac6795d | 2861 | */ |
cf3af59e | 2862 | static int check_existing_daemon(void) |
fac6795d | 2863 | { |
7d8234d9 | 2864 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 2865 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 2866 | return 0; |
099e26bd | 2867 | } |
7d8234d9 | 2868 | /* Is there anybody out there ? */ |
099e26bd | 2869 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 2870 | return -EEXIST; |
099e26bd | 2871 | } else { |
7d8234d9 | 2872 | return 0; |
099e26bd | 2873 | } |
fac6795d DG |
2874 | } |
2875 | ||
fac6795d | 2876 | /* |
d063d709 | 2877 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2878 | * |
d063d709 DG |
2879 | * Race window between mkdir and chown is OK because we are going from more |
2880 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2881 | */ |
d6f42150 | 2882 | static int set_permissions(void) |
fac6795d DG |
2883 | { |
2884 | int ret; | |
996b65c8 | 2885 | gid_t gid; |
fac6795d | 2886 | |
996b65c8 MD |
2887 | gid = allowed_group(); |
2888 | if (gid < 0) { | |
a463f419 DG |
2889 | if (is_root) { |
2890 | WARN("No tracing group detected"); | |
2891 | ret = 0; | |
2892 | } else { | |
2893 | ERR("Missing tracing group. Aborting execution."); | |
2894 | ret = -1; | |
2895 | } | |
fac6795d DG |
2896 | goto end; |
2897 | } | |
2898 | ||
d6f42150 | 2899 | /* Set lttng run dir */ |
996b65c8 | 2900 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
2901 | if (ret < 0) { |
2902 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2903 | perror("chown"); | |
2904 | } | |
2905 | ||
2906 | /* lttng client socket path */ | |
996b65c8 | 2907 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 2908 | if (ret < 0) { |
d6f42150 DG |
2909 | ERR("Unable to set group on %s", client_unix_sock_path); |
2910 | perror("chown"); | |
2911 | } | |
2912 | ||
2913 | /* kconsumerd error socket path */ | |
996b65c8 | 2914 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
2915 | if (ret < 0) { |
2916 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2917 | perror("chown"); |
2918 | } | |
2919 | ||
d6f42150 | 2920 | DBG("All permissions are set"); |
e07ae692 | 2921 | |
fac6795d DG |
2922 | end: |
2923 | return ret; | |
2924 | } | |
2925 | ||
7a485870 | 2926 | /* |
d063d709 | 2927 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2928 | */ |
2929 | static int create_kernel_poll_pipe(void) | |
2930 | { | |
2931 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2932 | } | |
2933 | ||
099e26bd DG |
2934 | /* |
2935 | * Create the application command pipe to wake thread_manage_apps. | |
2936 | */ | |
2937 | static int create_apps_cmd_pipe(void) | |
2938 | { | |
2939 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
2940 | } | |
2941 | ||
d6f42150 | 2942 | /* |
d063d709 | 2943 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2944 | */ |
2945 | static int create_lttng_rundir(void) | |
2946 | { | |
2947 | int ret; | |
2948 | ||
2949 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2950 | if (ret < 0) { | |
b1f11e69 DG |
2951 | if (errno != EEXIST) { |
2952 | ERR("Unable to create " LTTNG_RUNDIR); | |
2953 | goto error; | |
2954 | } else { | |
2955 | ret = 0; | |
2956 | } | |
d6f42150 DG |
2957 | } |
2958 | ||
2959 | error: | |
2960 | return ret; | |
2961 | } | |
2962 | ||
2963 | /* | |
d063d709 DG |
2964 | * Setup sockets and directory needed by the kconsumerd communication with the |
2965 | * session daemon. | |
d6f42150 DG |
2966 | */ |
2967 | static int set_kconsumerd_sockets(void) | |
2968 | { | |
2969 | int ret; | |
2970 | ||
2971 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2972 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2973 | } | |
2974 | ||
2975 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2976 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2977 | } | |
2978 | ||
2979 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2980 | if (ret < 0) { | |
6beb2242 DG |
2981 | if (errno != EEXIST) { |
2982 | ERR("Failed to create " KCONSUMERD_PATH); | |
2983 | goto error; | |
2984 | } | |
2985 | ret = 0; | |
d6f42150 DG |
2986 | } |
2987 | ||
2988 | /* Create the kconsumerd error unix socket */ | |
2989 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
2990 | if (kconsumerd_err_sock < 0) { | |
2991 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
2992 | ret = -1; | |
2993 | goto error; | |
2994 | } | |
2995 | ||
2996 | /* File permission MUST be 660 */ | |
2997 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2998 | if (ret < 0) { | |
2999 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3000 | perror("chmod"); | |
3001 | goto error; | |
3002 | } | |
3003 | ||
3004 | error: | |
3005 | return ret; | |
3006 | } | |
3007 | ||
fac6795d | 3008 | /* |
d063d709 | 3009 | * Signal handler for the daemon |
cf3af59e MD |
3010 | * |
3011 | * Simply stop all worker threads, leaving main() return gracefully | |
3012 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
3013 | */ |
3014 | static void sighandler(int sig) | |
3015 | { | |
3016 | switch (sig) { | |
cf3af59e MD |
3017 | case SIGPIPE: |
3018 | DBG("SIGPIPE catched"); | |
3019 | return; | |
3020 | case SIGINT: | |
3021 | DBG("SIGINT catched"); | |
3022 | stop_threads(); | |
3023 | break; | |
3024 | case SIGTERM: | |
3025 | DBG("SIGTERM catched"); | |
3026 | stop_threads(); | |
3027 | break; | |
3028 | default: | |
3029 | break; | |
fac6795d | 3030 | } |
fac6795d DG |
3031 | } |
3032 | ||
3033 | /* | |
d063d709 | 3034 | * Setup signal handler for : |
1d4b027a | 3035 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3036 | */ |
1d4b027a | 3037 | static int set_signal_handler(void) |
fac6795d | 3038 | { |
1d4b027a DG |
3039 | int ret = 0; |
3040 | struct sigaction sa; | |
3041 | sigset_t sigset; | |
fac6795d | 3042 | |
1d4b027a DG |
3043 | if ((ret = sigemptyset(&sigset)) < 0) { |
3044 | perror("sigemptyset"); | |
3045 | return ret; | |
3046 | } | |
d6f42150 | 3047 | |
1d4b027a DG |
3048 | sa.sa_handler = sighandler; |
3049 | sa.sa_mask = sigset; | |
3050 | sa.sa_flags = 0; | |
3051 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3052 | perror("sigaction"); | |
3053 | return ret; | |
d6f42150 DG |
3054 | } |
3055 | ||
1d4b027a DG |
3056 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3057 | perror("sigaction"); | |
3058 | return ret; | |
d6f42150 | 3059 | } |
aaf26714 | 3060 | |
1d4b027a DG |
3061 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3062 | perror("sigaction"); | |
3063 | return ret; | |
8c0faa1d DG |
3064 | } |
3065 | ||
1d4b027a DG |
3066 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3067 | ||
3068 | return ret; | |
fac6795d DG |
3069 | } |
3070 | ||
f3ed775e | 3071 | /* |
d063d709 DG |
3072 | * Set open files limit to unlimited. This daemon can open a large number of |
3073 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3074 | */ |
3075 | static void set_ulimit(void) | |
3076 | { | |
3077 | int ret; | |
3078 | struct rlimit lim; | |
3079 | ||
a88df331 | 3080 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3081 | lim.rlim_cur = 65535; |
3082 | lim.rlim_max = 65535; | |
3083 | ||
3084 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3085 | if (ret < 0) { | |
3086 | perror("failed to set open files limit"); | |
3087 | } | |
3088 | } | |
3089 | ||
fac6795d DG |
3090 | /* |
3091 | * main | |
3092 | */ | |
3093 | int main(int argc, char **argv) | |
3094 | { | |
fac6795d DG |
3095 | int ret = 0; |
3096 | void *status; | |
b082db07 | 3097 | const char *home_path; |
fac6795d | 3098 | |
273ea72c | 3099 | /* Create thread quit pipe */ |
cf3af59e MD |
3100 | if ((ret = init_thread_quit_pipe()) < 0) { |
3101 | goto error; | |
273ea72c DG |
3102 | } |
3103 | ||
fac6795d DG |
3104 | /* Parse arguments */ |
3105 | progname = argv[0]; | |
3106 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3107 | goto error; |
fac6795d DG |
3108 | } |
3109 | ||
3110 | /* Daemonize */ | |
3111 | if (opt_daemon) { | |
53094c05 DG |
3112 | ret = daemon(0, 0); |
3113 | if (ret < 0) { | |
3114 | perror("daemon"); | |
cf3af59e | 3115 | goto error; |
53094c05 | 3116 | } |
fac6795d DG |
3117 | } |
3118 | ||
3119 | /* Check if daemon is UID = 0 */ | |
3120 | is_root = !getuid(); | |
3121 | ||
fac6795d | 3122 | if (is_root) { |
d6f42150 DG |
3123 | ret = create_lttng_rundir(); |
3124 | if (ret < 0) { | |
cf3af59e | 3125 | goto error; |
d6f42150 DG |
3126 | } |
3127 | ||
fac6795d | 3128 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3129 | snprintf(apps_unix_sock_path, PATH_MAX, |
3130 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3131 | } |
3132 | ||
3133 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3134 | snprintf(client_unix_sock_path, PATH_MAX, |
3135 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3136 | } | |
fac6795d | 3137 | } else { |
b082db07 DG |
3138 | home_path = get_home_dir(); |
3139 | if (home_path == NULL) { | |
273ea72c DG |
3140 | /* TODO: Add --socket PATH option */ |
3141 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3142 | ret = -EPERM; |
3143 | goto error; | |
b082db07 DG |
3144 | } |
3145 | ||
fac6795d | 3146 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3147 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3148 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3149 | } |
3150 | ||
3151 | /* Set the cli tool unix socket path */ | |
3152 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3153 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3154 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d DG |
3155 | } |
3156 | } | |
3157 | ||
847177cd DG |
3158 | DBG("Client socket path %s", client_unix_sock_path); |
3159 | DBG("Application socket path %s", apps_unix_sock_path); | |
3160 | ||
273ea72c | 3161 | /* |
7d8234d9 | 3162 | * See if daemon already exist. |
fac6795d | 3163 | */ |
7d8234d9 | 3164 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3165 | ERR("Already running daemon.\n"); |
273ea72c | 3166 | /* |
cf3af59e MD |
3167 | * We do not goto exit because we must not cleanup() |
3168 | * because a daemon is already running. | |
ab118b20 | 3169 | */ |
cf3af59e | 3170 | goto error; |
a88df331 DG |
3171 | } |
3172 | ||
3173 | /* After this point, we can safely call cleanup() so goto error is used */ | |
3174 | ||
3175 | /* | |
3176 | * These actions must be executed as root. We do that *after* setting up | |
3177 | * the sockets path because we MUST make the check for another daemon using | |
3178 | * those paths *before* trying to set the kernel consumer sockets and init | |
3179 | * kernel tracer. | |
3180 | */ | |
3181 | if (is_root) { | |
3182 | ret = set_kconsumerd_sockets(); | |
3183 | if (ret < 0) { | |
cf3af59e | 3184 | goto exit; |
a88df331 DG |
3185 | } |
3186 | ||
3187 | /* Setup kernel tracer */ | |
3188 | init_kernel_tracer(); | |
3189 | ||
3190 | /* Set ulimit for open files */ | |
3191 | set_ulimit(); | |
fac6795d DG |
3192 | } |
3193 | ||
cf3af59e MD |
3194 | if ((ret = set_signal_handler()) < 0) { |
3195 | goto exit; | |
fac6795d DG |
3196 | } |
3197 | ||
d6f42150 | 3198 | /* Setup the needed unix socket */ |
cf3af59e MD |
3199 | if ((ret = init_daemon_socket()) < 0) { |
3200 | goto exit; | |
fac6795d DG |
3201 | } |
3202 | ||
3203 | /* Set credentials to socket */ | |
cf3af59e MD |
3204 | if (is_root && ((ret = set_permissions()) < 0)) { |
3205 | goto exit; | |
fac6795d DG |
3206 | } |
3207 | ||
5b8719f5 DG |
3208 | /* Get parent pid if -S, --sig-parent is specified. */ |
3209 | if (opt_sig_parent) { | |
3210 | ppid = getppid(); | |
3211 | } | |
3212 | ||
7a485870 | 3213 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3214 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3215 | goto exit; | |
7a485870 DG |
3216 | } |
3217 | ||
099e26bd DG |
3218 | /* Setup the thread apps communication pipe. */ |
3219 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3220 | goto exit; | |
3221 | } | |
3222 | ||
3223 | /* Init UST command queue. */ | |
3224 | cds_wfq_init(&ust_cmd_queue.queue); | |
3225 | ||
273ea72c DG |
3226 | /* |
3227 | * Get session list pointer. This pointer MUST NOT be free(). | |
3228 | * This list is statically declared in session.c | |
3229 | */ | |
b5541356 DG |
3230 | session_list_ptr = get_session_list(); |
3231 | ||
cf3af59e | 3232 | /* Create thread to manage the client socket */ |
099e26bd DG |
3233 | ret = pthread_create(&client_thread, NULL, |
3234 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3235 | if (ret != 0) { |
099e26bd | 3236 | perror("pthread_create clients"); |
cf3af59e MD |
3237 | goto exit_client; |
3238 | } | |
fac6795d | 3239 | |
099e26bd DG |
3240 | /* Create thread to dispatch registration */ |
3241 | ret = pthread_create(&dispatch_thread, NULL, | |
3242 | thread_dispatch_ust_registration, (void *) NULL); | |
3243 | if (ret != 0) { | |
3244 | perror("pthread_create dispatch"); | |
3245 | goto exit_dispatch; | |
3246 | } | |
3247 | ||
3248 | /* Create thread to manage application registration. */ | |
3249 | ret = pthread_create(®_apps_thread, NULL, | |
3250 | thread_registration_apps, (void *) NULL); | |
3251 | if (ret != 0) { | |
3252 | perror("pthread_create registration"); | |
3253 | goto exit_reg_apps; | |
3254 | } | |
3255 | ||
cf3af59e MD |
3256 | /* Create thread to manage application socket */ |
3257 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
3258 | if (ret != 0) { | |
099e26bd | 3259 | perror("pthread_create apps"); |
cf3af59e MD |
3260 | goto exit_apps; |
3261 | } | |
fac6795d | 3262 | |
cf3af59e MD |
3263 | /* Create kernel thread to manage kernel event */ |
3264 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
3265 | if (ret != 0) { | |
099e26bd | 3266 | perror("pthread_create kernel"); |
cf3af59e MD |
3267 | goto exit_kernel; |
3268 | } | |
7a485870 | 3269 | |
cf3af59e MD |
3270 | ret = pthread_join(kernel_thread, &status); |
3271 | if (ret != 0) { | |
3272 | perror("pthread_join"); | |
3273 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3274 | } |
3275 | ||
cf3af59e MD |
3276 | exit_kernel: |
3277 | ret = pthread_join(apps_thread, &status); | |
3278 | if (ret != 0) { | |
3279 | perror("pthread_join"); | |
3280 | goto error; /* join error, exit without cleanup */ | |
3281 | } | |
fac6795d | 3282 | |
cf3af59e | 3283 | exit_apps: |
099e26bd DG |
3284 | ret = pthread_join(reg_apps_thread, &status); |
3285 | if (ret != 0) { | |
3286 | perror("pthread_join"); | |
3287 | goto error; /* join error, exit without cleanup */ | |
3288 | } | |
3289 | ||
3290 | exit_reg_apps: | |
3291 | ret = pthread_join(dispatch_thread, &status); | |
3292 | if (ret != 0) { | |
3293 | perror("pthread_join"); | |
3294 | goto error; /* join error, exit without cleanup */ | |
3295 | } | |
3296 | ||
3297 | exit_dispatch: | |
cf3af59e MD |
3298 | ret = pthread_join(client_thread, &status); |
3299 | if (ret != 0) { | |
3300 | perror("pthread_join"); | |
3301 | goto error; /* join error, exit without cleanup */ | |
3302 | } | |
3303 | ||
3304 | ret = join_kconsumerd_thread(); | |
3305 | if (ret != 0) { | |
3306 | perror("join_kconsumerd"); | |
3307 | goto error; /* join error, exit without cleanup */ | |
3308 | } | |
a88df331 | 3309 | |
cf3af59e | 3310 | exit_client: |
a88df331 | 3311 | exit: |
cf3af59e MD |
3312 | /* |
3313 | * cleanup() is called when no other thread is running. | |
3314 | */ | |
3315 | cleanup(); | |
3316 | if (!ret) | |
3317 | exit(EXIT_SUCCESS); | |
3318 | error: | |
5e16da05 | 3319 | exit(EXIT_FAILURE); |
fac6795d | 3320 | } |