Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * 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> | |
0fdd1e2c | 32 | #include <sys/mman.h> |
b73401da | 33 | #include <sys/mount.h> |
1e307fab | 34 | #include <sys/resource.h> |
fac6795d DG |
35 | #include <sys/socket.h> |
36 | #include <sys/stat.h> | |
37 | #include <sys/types.h> | |
0fdd1e2c DG |
38 | #include <sys/wait.h> |
39 | #include <urcu/futex.h> | |
fac6795d DG |
40 | #include <unistd.h> |
41 | ||
1e307fab | 42 | #include <ltt-kconsumerd.h> |
e88129fc | 43 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
44 | #include <lttng/lttng-kconsumerd.h> |
45 | #include <lttngerr.h> | |
fac6795d | 46 | |
099e26bd DG |
47 | #include "context.h" |
48 | #include "futex.h" | |
20fe2104 | 49 | #include "kernel-ctl.h" |
1e307fab | 50 | #include "ltt-sessiond.h" |
0fdd1e2c | 51 | #include "shm.h" |
91d76f53 | 52 | #include "traceable-app.h" |
1e307fab | 53 | #include "ust-ctl.h" |
8e68d1c8 | 54 | #include "utils.h" |
0177d773 | 55 | #include "ust-ctl.h" |
fac6795d | 56 | |
75462a81 | 57 | /* Const values */ |
686204ab | 58 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 59 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
60 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
61 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
62 | ||
fac6795d | 63 | /* Variables */ |
1d4b027a | 64 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 65 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 66 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 67 | |
fac6795d DG |
68 | const char *progname; |
69 | const char *opt_tracing_group; | |
5b8719f5 | 70 | static int opt_sig_parent; |
fac6795d DG |
71 | static int opt_daemon; |
72 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
73 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
74 | static pid_t kconsumerd_pid; | |
7a485870 | 75 | static struct pollfd *kernel_pollfd; |
099e26bd | 76 | static int dispatch_thread_exit; |
fac6795d | 77 | |
d6f42150 DG |
78 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
79 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
80 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
81 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
0fdd1e2c | 82 | static char wait_shm_path[PATH_MAX]; /* global wait shm path for UST */ |
fac6795d | 83 | |
1d4b027a | 84 | /* Sockets and FDs */ |
d6f42150 DG |
85 | static int client_sock; |
86 | static int apps_sock; | |
87 | static int kconsumerd_err_sock; | |
8c0faa1d | 88 | static int kconsumerd_cmd_sock; |
20fe2104 | 89 | static int kernel_tracer_fd; |
7a485870 | 90 | static int kernel_poll_pipe[2]; |
1d4b027a | 91 | |
273ea72c DG |
92 | /* |
93 | * Quit pipe for all threads. This permits a single cancellation point | |
94 | * for all threads when receiving an event on the pipe. | |
95 | */ | |
96 | static int thread_quit_pipe[2]; | |
97 | ||
099e26bd DG |
98 | /* |
99 | * This pipe is used to inform the thread managing application communication | |
100 | * that a command is queued and ready to be processed. | |
101 | */ | |
102 | static int apps_cmd_pipe[2]; | |
103 | ||
1d4b027a | 104 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 105 | static pthread_t kconsumerd_thread; |
1d4b027a | 106 | static pthread_t apps_thread; |
099e26bd | 107 | static pthread_t reg_apps_thread; |
1d4b027a | 108 | static pthread_t client_thread; |
7a485870 | 109 | static pthread_t kernel_thread; |
099e26bd | 110 | static pthread_t dispatch_thread; |
8c0faa1d DG |
111 | static sem_t kconsumerd_sem; |
112 | ||
1d4b027a | 113 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
fac6795d | 114 | |
099e26bd DG |
115 | /* |
116 | * UST registration command queue. This queue is tied with a futex and uses a N | |
117 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
118 | * | |
119 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
120 | * this queue and the wait/wake scheme. | |
121 | */ | |
122 | static struct ust_cmd_queue ust_cmd_queue; | |
123 | ||
b5541356 DG |
124 | /* |
125 | * Pointer initialized before thread creation. | |
126 | * | |
127 | * This points to the tracing session list containing the session count and a | |
128 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
129 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 130 | * |
d063d709 DG |
131 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
132 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
133 | */ |
134 | static struct ltt_session_list *session_list_ptr; | |
135 | ||
0fdd1e2c DG |
136 | /* |
137 | * Remove modules in reverse load order. | |
138 | */ | |
139 | static int modprobe_remove_kernel_modules(void) | |
140 | { | |
141 | int ret = 0, i; | |
142 | char modprobe[256]; | |
143 | ||
144 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
145 | ret = snprintf(modprobe, sizeof(modprobe), | |
146 | "/sbin/modprobe --remove --quiet %s", | |
147 | kernel_modules_list[i].name); | |
148 | if (ret < 0) { | |
149 | perror("snprintf modprobe --remove"); | |
150 | goto error; | |
151 | } | |
152 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
153 | ret = system(modprobe); | |
154 | if (ret == -1) { | |
155 | ERR("Unable to launch modprobe --remove for module %s", | |
156 | kernel_modules_list[i].name); | |
157 | } else if (kernel_modules_list[i].required | |
158 | && WEXITSTATUS(ret) != 0) { | |
159 | ERR("Unable to remove module %s", | |
160 | kernel_modules_list[i].name); | |
161 | } else { | |
162 | DBG("Modprobe removal successful %s", | |
163 | kernel_modules_list[i].name); | |
164 | } | |
165 | } | |
166 | ||
167 | error: | |
168 | return ret; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Return group ID of the tracing group or -1 if not found. | |
173 | */ | |
996b65c8 MD |
174 | static gid_t allowed_group(void) |
175 | { | |
176 | struct group *grp; | |
177 | ||
274e143b MD |
178 | if (opt_tracing_group) { |
179 | grp = getgrnam(opt_tracing_group); | |
180 | } else { | |
181 | grp = getgrnam(default_tracing_group); | |
182 | } | |
996b65c8 MD |
183 | if (!grp) { |
184 | return -1; | |
185 | } else { | |
186 | return grp->gr_gid; | |
187 | } | |
188 | } | |
189 | ||
273ea72c DG |
190 | /* |
191 | * Init quit pipe. | |
192 | * | |
193 | * Return -1 on error or 0 if all pipes are created. | |
194 | */ | |
195 | static int init_thread_quit_pipe(void) | |
196 | { | |
197 | int ret; | |
198 | ||
199 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
200 | if (ret < 0) { | |
201 | perror("thread quit pipe"); | |
202 | goto error; | |
203 | } | |
204 | ||
205 | error: | |
206 | return ret; | |
207 | } | |
208 | ||
fac6795d | 209 | /* |
d063d709 DG |
210 | * Complete teardown of a kernel session. This free all data structure related |
211 | * to a kernel session and update counter. | |
fac6795d | 212 | */ |
1d4b027a | 213 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 214 | { |
1d4b027a DG |
215 | if (session->kernel_session != NULL) { |
216 | DBG("Tearing down kernel session"); | |
d9800920 DG |
217 | |
218 | /* | |
219 | * If a custom kernel consumer was registered, close the socket before | |
220 | * tearing down the complete kernel session structure | |
221 | */ | |
222 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
223 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
224 | } | |
225 | ||
62499ad6 | 226 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
227 | /* Extra precaution */ |
228 | session->kernel_session = NULL; | |
fac6795d | 229 | } |
fac6795d DG |
230 | } |
231 | ||
099e26bd DG |
232 | /* |
233 | * Stop all threads by closing the thread quit pipe. | |
234 | */ | |
cf3af59e MD |
235 | static void stop_threads(void) |
236 | { | |
237 | /* Stopping all threads */ | |
238 | DBG("Terminating all threads"); | |
239 | close(thread_quit_pipe[0]); | |
240 | close(thread_quit_pipe[1]); | |
099e26bd DG |
241 | /* Dispatch thread */ |
242 | dispatch_thread_exit = 1; | |
243 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
244 | } |
245 | ||
fac6795d | 246 | /* |
d063d709 | 247 | * Cleanup the daemon |
fac6795d | 248 | */ |
cf3af59e | 249 | static void cleanup(void) |
fac6795d | 250 | { |
1d4b027a DG |
251 | int ret; |
252 | char *cmd; | |
af9737e9 | 253 | struct ltt_session *sess, *stmp; |
fac6795d | 254 | |
1d4b027a | 255 | DBG("Cleaning up"); |
e07ae692 | 256 | |
1d4b027a | 257 | /* <fun> */ |
2f50c8a3 | 258 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
273ea72c DG |
259 | "Matthew, BEET driven development works!%c[%dm", |
260 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 261 | /* </fun> */ |
fac6795d | 262 | |
1d4b027a DG |
263 | DBG("Removing %s directory", LTTNG_RUNDIR); |
264 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
265 | if (ret < 0) { | |
266 | ERR("asprintf failed. Something is really wrong!"); | |
267 | } | |
5461b305 | 268 | |
1d4b027a DG |
269 | /* Remove lttng run directory */ |
270 | ret = system(cmd); | |
271 | if (ret < 0) { | |
272 | ERR("Unable to clean " LTTNG_RUNDIR); | |
273 | } | |
5461b305 | 274 | |
1d4b027a | 275 | DBG("Cleaning up all session"); |
fac6795d | 276 | |
b5541356 | 277 | /* Destroy session list mutex */ |
273ea72c DG |
278 | if (session_list_ptr != NULL) { |
279 | pthread_mutex_destroy(&session_list_ptr->lock); | |
280 | ||
281 | /* Cleanup ALL session */ | |
af9737e9 | 282 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
273ea72c DG |
283 | teardown_kernel_session(sess); |
284 | // TODO complete session cleanup (including UST) | |
285 | } | |
286 | } | |
287 | ||
099e26bd DG |
288 | DBG("Closing all UST sockets"); |
289 | clean_traceable_apps_list(); | |
290 | ||
273ea72c | 291 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
b5541356 | 292 | |
f3ed775e | 293 | DBG("Closing kernel fd"); |
1d4b027a | 294 | close(kernel_tracer_fd); |
ab147185 | 295 | |
2f50c8a3 DG |
296 | if (is_root) { |
297 | DBG("Unloading kernel modules"); | |
298 | modprobe_remove_kernel_modules(); | |
299 | } | |
fac6795d DG |
300 | } |
301 | ||
e065084a | 302 | /* |
d063d709 | 303 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 304 | * |
d063d709 | 305 | * Return lttcomm error code. |
e065084a DG |
306 | */ |
307 | static int send_unix_sock(int sock, void *buf, size_t len) | |
308 | { | |
309 | /* Check valid length */ | |
310 | if (len <= 0) { | |
311 | return -1; | |
312 | } | |
313 | ||
314 | return lttcomm_send_unix_sock(sock, buf, len); | |
315 | } | |
316 | ||
5461b305 | 317 | /* |
d063d709 | 318 | * Free memory of a command context structure. |
5461b305 | 319 | */ |
a2fb29a5 | 320 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 321 | { |
a2fb29a5 DG |
322 | DBG("Clean command context structure"); |
323 | if (*cmd_ctx) { | |
324 | if ((*cmd_ctx)->llm) { | |
325 | free((*cmd_ctx)->llm); | |
5461b305 | 326 | } |
a2fb29a5 DG |
327 | if ((*cmd_ctx)->lsm) { |
328 | free((*cmd_ctx)->lsm); | |
5461b305 | 329 | } |
a2fb29a5 DG |
330 | free(*cmd_ctx); |
331 | *cmd_ctx = NULL; | |
5461b305 DG |
332 | } |
333 | } | |
334 | ||
f3ed775e | 335 | /* |
d063d709 | 336 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 337 | */ |
7a485870 | 338 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
339 | { |
340 | int ret; | |
341 | size_t nb_fd; | |
342 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
343 | struct lttcomm_kconsumerd_header lkh; |
344 | struct lttcomm_kconsumerd_msg lkm; | |
345 | ||
7a485870 DG |
346 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
347 | ||
348 | nb_fd = channel->stream_count; | |
f3ed775e DG |
349 | |
350 | /* Setup header */ | |
7a485870 | 351 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
352 | lkh.cmd_type = ADD_STREAM; |
353 | ||
354 | DBG("Sending kconsumerd header"); | |
355 | ||
356 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
357 | if (ret < 0) { | |
358 | perror("send kconsumerd header"); | |
359 | goto error; | |
360 | } | |
361 | ||
7a485870 DG |
362 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
363 | if (stream->fd != 0) { | |
f3ed775e DG |
364 | lkm.fd = stream->fd; |
365 | lkm.state = stream->state; | |
7a485870 | 366 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 367 | lkm.output = channel->channel->attr.output; |
f3ed775e | 368 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 369 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
370 | |
371 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
372 | ||
373 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
374 | if (ret < 0) { | |
375 | perror("send kconsumerd fd"); | |
376 | goto error; | |
377 | } | |
378 | } | |
379 | } | |
380 | ||
7a485870 | 381 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
382 | |
383 | return 0; | |
384 | ||
385 | error: | |
386 | return ret; | |
387 | } | |
388 | ||
389 | /* | |
d063d709 | 390 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 391 | */ |
d9800920 | 392 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
393 | { |
394 | int ret; | |
395 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
396 | struct lttcomm_kconsumerd_header lkh; |
397 | struct lttcomm_kconsumerd_msg lkm; | |
398 | ||
399 | /* Setup header */ | |
400 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
401 | lkh.cmd_type = ADD_STREAM; | |
402 | ||
403 | DBG("Sending kconsumerd header for metadata"); | |
404 | ||
d9800920 | 405 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
7a485870 DG |
406 | if (ret < 0) { |
407 | perror("send kconsumerd header"); | |
408 | goto error; | |
409 | } | |
410 | ||
411 | DBG("Sending metadata stream fd"); | |
412 | ||
d9800920 DG |
413 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
414 | if (session->consumer_fd == 0) { | |
415 | session->consumer_fd = kconsumerd_cmd_sock; | |
416 | } | |
417 | ||
7a485870 DG |
418 | if (session->metadata_stream_fd != 0) { |
419 | /* Send metadata stream fd first */ | |
420 | lkm.fd = session->metadata_stream_fd; | |
421 | lkm.state = ACTIVE_FD; | |
422 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 423 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 424 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 425 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 426 | |
d9800920 | 427 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, &lkm.fd, 1, sizeof(lkm)); |
7a485870 DG |
428 | if (ret < 0) { |
429 | perror("send kconsumerd fd"); | |
430 | goto error; | |
431 | } | |
432 | } | |
f3ed775e | 433 | |
f3ed775e | 434 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 435 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 436 | if (ret < 0) { |
7a485870 | 437 | goto error; |
f3ed775e DG |
438 | } |
439 | } | |
440 | ||
7a485870 DG |
441 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
442 | ||
f3ed775e DG |
443 | return 0; |
444 | ||
445 | error: | |
446 | return ret; | |
447 | } | |
448 | ||
fac6795d | 449 | /* |
0fdd1e2c | 450 | * Notify UST applications using the shm mmap futex. |
fac6795d | 451 | */ |
0fdd1e2c | 452 | static int notify_ust_apps(int active) |
fac6795d | 453 | { |
0fdd1e2c | 454 | char *wait_shm_mmap; |
fac6795d | 455 | |
0fdd1e2c | 456 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 457 | |
0fdd1e2c DG |
458 | /* See shm.c for this call implying mmap, shm and futex calls */ |
459 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
460 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
461 | goto error; |
462 | } | |
463 | ||
0fdd1e2c DG |
464 | /* Wake waiting process */ |
465 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
466 | ||
467 | /* Apps notified successfully */ | |
468 | return 0; | |
fac6795d DG |
469 | |
470 | error: | |
0fdd1e2c | 471 | return -1; |
fac6795d DG |
472 | } |
473 | ||
e065084a | 474 | /* |
d063d709 DG |
475 | * Setup the outgoing data buffer for the response (llm) by allocating the |
476 | * right amount of memory and copying the original information from the lsm | |
477 | * structure. | |
ca95a216 | 478 | * |
d063d709 | 479 | * Return total size of the buffer pointed by buf. |
ca95a216 | 480 | */ |
5461b305 | 481 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 482 | { |
f3ed775e | 483 | int ret, buf_size; |
ca95a216 | 484 | |
f3ed775e | 485 | buf_size = size; |
5461b305 DG |
486 | |
487 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
488 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 489 | perror("malloc"); |
5461b305 | 490 | ret = -ENOMEM; |
ca95a216 DG |
491 | goto error; |
492 | } | |
493 | ||
5461b305 DG |
494 | /* Copy common data */ |
495 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 496 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 497 | |
5461b305 DG |
498 | cmd_ctx->llm->data_size = size; |
499 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
500 | ||
ca95a216 DG |
501 | return buf_size; |
502 | ||
503 | error: | |
504 | return ret; | |
505 | } | |
506 | ||
7a485870 | 507 | /* |
d063d709 DG |
508 | * Update the kernel pollfd set of all channel fd available over all tracing |
509 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
510 | */ |
511 | static int update_kernel_pollfd(void) | |
512 | { | |
513 | int i = 0; | |
273ea72c DG |
514 | /* |
515 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
516 | * at 2 for those pipes. | |
517 | */ | |
518 | unsigned int nb_fd = 2; | |
7a485870 DG |
519 | struct ltt_session *session; |
520 | struct ltt_kernel_channel *channel; | |
521 | ||
522 | DBG("Updating kernel_pollfd"); | |
523 | ||
524 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 525 | lock_session_list(); |
b5541356 DG |
526 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
527 | lock_session(session); | |
7a485870 | 528 | if (session->kernel_session == NULL) { |
b5541356 | 529 | unlock_session(session); |
7a485870 DG |
530 | continue; |
531 | } | |
532 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 533 | unlock_session(session); |
7a485870 DG |
534 | } |
535 | ||
536 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
537 | ||
538 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
539 | if (kernel_pollfd == NULL) { | |
540 | perror("malloc kernel_pollfd"); | |
541 | goto error; | |
542 | } | |
543 | ||
b5541356 DG |
544 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
545 | lock_session(session); | |
7a485870 | 546 | if (session->kernel_session == NULL) { |
b5541356 | 547 | unlock_session(session); |
7a485870 DG |
548 | continue; |
549 | } | |
550 | if (i >= nb_fd) { | |
551 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 552 | unlock_session(session); |
7a485870 DG |
553 | break; |
554 | } | |
555 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
556 | kernel_pollfd[i].fd = channel->fd; | |
557 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
558 | i++; | |
559 | } | |
b5541356 | 560 | unlock_session(session); |
7a485870 | 561 | } |
6c9cc2ab | 562 | unlock_session_list(); |
7a485870 DG |
563 | |
564 | /* Adding wake up pipe */ | |
273ea72c DG |
565 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
566 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
567 | ||
568 | /* Adding the quit pipe */ | |
569 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
570 | |
571 | return nb_fd; | |
572 | ||
573 | error: | |
6c9cc2ab | 574 | unlock_session_list(); |
7a485870 DG |
575 | return -1; |
576 | } | |
577 | ||
578 | /* | |
d063d709 DG |
579 | * Find the channel fd from 'fd' over all tracing session. When found, check |
580 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 581 | * |
d063d709 | 582 | * Useful for CPU hotplug feature. |
7a485870 DG |
583 | */ |
584 | static int update_kernel_stream(int fd) | |
585 | { | |
586 | int ret = 0; | |
587 | struct ltt_session *session; | |
588 | struct ltt_kernel_channel *channel; | |
589 | ||
590 | DBG("Updating kernel streams for channel fd %d", fd); | |
591 | ||
6c9cc2ab | 592 | lock_session_list(); |
b5541356 DG |
593 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
594 | lock_session(session); | |
7a485870 | 595 | if (session->kernel_session == NULL) { |
b5541356 | 596 | unlock_session(session); |
7a485870 DG |
597 | continue; |
598 | } | |
d9800920 DG |
599 | |
600 | /* This is not suppose to be 0 but this is an extra security check */ | |
601 | if (session->kernel_session->consumer_fd == 0) { | |
602 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
603 | } | |
604 | ||
7a485870 DG |
605 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
606 | if (channel->fd == fd) { | |
607 | DBG("Channel found, updating kernel streams"); | |
608 | ret = kernel_open_channel_stream(channel); | |
609 | if (ret < 0) { | |
610 | goto end; | |
611 | } | |
d9800920 | 612 | |
7a485870 DG |
613 | /* |
614 | * Have we already sent fds to the consumer? If yes, it means that | |
615 | * tracing is started so it is safe to send our updated stream fds. | |
616 | */ | |
617 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
d9800920 DG |
618 | ret = send_kconsumerd_channel_fds(session->kernel_session->consumer_fd, |
619 | channel); | |
7a485870 DG |
620 | if (ret < 0) { |
621 | goto end; | |
622 | } | |
623 | } | |
624 | goto end; | |
625 | } | |
626 | } | |
b5541356 | 627 | unlock_session(session); |
7a485870 DG |
628 | } |
629 | ||
630 | end: | |
6c9cc2ab | 631 | unlock_session_list(); |
b5541356 DG |
632 | if (session) { |
633 | unlock_session(session); | |
634 | } | |
7a485870 DG |
635 | return ret; |
636 | } | |
637 | ||
638 | /* | |
d063d709 | 639 | * This thread manage event coming from the kernel. |
7a485870 | 640 | * |
d063d709 DG |
641 | * Features supported in this thread: |
642 | * -) CPU Hotplug | |
7a485870 DG |
643 | */ |
644 | static void *thread_manage_kernel(void *data) | |
645 | { | |
646 | int ret, i, nb_fd = 0; | |
647 | char tmp; | |
648 | int update_poll_flag = 1; | |
649 | ||
650 | DBG("Thread manage kernel started"); | |
651 | ||
652 | while (1) { | |
653 | if (update_poll_flag == 1) { | |
654 | nb_fd = update_kernel_pollfd(); | |
655 | if (nb_fd < 0) { | |
656 | goto error; | |
657 | } | |
658 | update_poll_flag = 0; | |
659 | } | |
660 | ||
661 | DBG("Polling on %d fds", nb_fd); | |
662 | ||
663 | /* Poll infinite value of time */ | |
664 | ret = poll(kernel_pollfd, nb_fd, -1); | |
665 | if (ret < 0) { | |
666 | perror("poll kernel thread"); | |
667 | goto error; | |
668 | } else if (ret == 0) { | |
669 | /* Should not happen since timeout is infinite */ | |
670 | continue; | |
671 | } | |
672 | ||
273ea72c DG |
673 | /* Thread quit pipe has been closed. Killing thread. */ |
674 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
675 | goto error; | |
676 | } | |
677 | ||
7a485870 DG |
678 | DBG("Kernel poll event triggered"); |
679 | ||
680 | /* | |
681 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
682 | * must be updated. | |
683 | */ | |
273ea72c | 684 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 685 | case POLLIN: |
7a485870 DG |
686 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
687 | update_poll_flag = 1; | |
688 | continue; | |
b5541356 DG |
689 | case POLLERR: |
690 | goto error; | |
691 | default: | |
692 | break; | |
7a485870 DG |
693 | } |
694 | ||
695 | for (i = 0; i < nb_fd; i++) { | |
696 | switch (kernel_pollfd[i].revents) { | |
697 | /* | |
698 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
699 | * session and updating the kernel consumer | |
700 | */ | |
701 | case POLLIN | POLLRDNORM: | |
702 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
703 | if (ret < 0) { | |
704 | continue; | |
705 | } | |
706 | break; | |
707 | } | |
708 | } | |
709 | } | |
710 | ||
711 | error: | |
712 | DBG("Kernel thread dying"); | |
713 | if (kernel_pollfd) { | |
714 | free(kernel_pollfd); | |
715 | } | |
273ea72c DG |
716 | |
717 | close(kernel_poll_pipe[0]); | |
718 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
719 | return NULL; |
720 | } | |
721 | ||
1d4b027a | 722 | /* |
d063d709 | 723 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
724 | */ |
725 | static void *thread_manage_kconsumerd(void *data) | |
726 | { | |
273ea72c | 727 | int sock = 0, ret; |
1d4b027a | 728 | enum lttcomm_return_code code; |
273ea72c | 729 | struct pollfd pollfd[2]; |
1d4b027a DG |
730 | |
731 | DBG("[thread] Manage kconsumerd started"); | |
732 | ||
733 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
734 | if (ret < 0) { | |
735 | goto error; | |
736 | } | |
737 | ||
273ea72c DG |
738 | /* First fd is always the quit pipe */ |
739 | pollfd[0].fd = thread_quit_pipe[0]; | |
740 | ||
741 | /* Apps socket */ | |
742 | pollfd[1].fd = kconsumerd_err_sock; | |
743 | pollfd[1].events = POLLIN; | |
744 | ||
745 | /* Inifinite blocking call, waiting for transmission */ | |
746 | ret = poll(pollfd, 2, -1); | |
747 | if (ret < 0) { | |
748 | perror("poll kconsumerd thread"); | |
749 | goto error; | |
750 | } | |
751 | ||
752 | /* Thread quit pipe has been closed. Killing thread. */ | |
753 | if (pollfd[0].revents == POLLNVAL) { | |
754 | goto error; | |
755 | } else if (pollfd[1].revents == POLLERR) { | |
756 | ERR("Kconsumerd err socket poll error"); | |
757 | goto error; | |
758 | } | |
759 | ||
1d4b027a DG |
760 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
761 | if (sock < 0) { | |
762 | goto error; | |
763 | } | |
764 | ||
712ea556 | 765 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
766 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
767 | if (ret <= 0) { | |
768 | goto error; | |
769 | } | |
770 | ||
771 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
772 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
773 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 774 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
775 | perror("kconsumerd connect"); |
776 | goto error; | |
777 | } | |
778 | /* Signal condition to tell that the kconsumerd is ready */ | |
779 | sem_post(&kconsumerd_sem); | |
780 | DBG("Kconsumerd command socket ready"); | |
781 | } else { | |
6f61d021 | 782 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
783 | lttcomm_get_readable_code(-code)); |
784 | goto error; | |
785 | } | |
786 | ||
72079cae DG |
787 | /* Kconsumerd err socket */ |
788 | pollfd[1].fd = sock; | |
789 | pollfd[1].events = POLLIN; | |
790 | ||
791 | /* Inifinite blocking call, waiting for transmission */ | |
792 | ret = poll(pollfd, 2, -1); | |
793 | if (ret < 0) { | |
794 | perror("poll kconsumerd thread"); | |
795 | goto error; | |
796 | } | |
797 | ||
798 | /* Thread quit pipe has been closed. Killing thread. */ | |
799 | if (pollfd[0].revents == POLLNVAL) { | |
800 | goto error; | |
801 | } else if (pollfd[1].revents == POLLERR) { | |
802 | ERR("Kconsumerd err socket second poll error"); | |
803 | goto error; | |
804 | } | |
805 | ||
712ea556 DG |
806 | /* Wait for any kconsumerd error */ |
807 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
808 | if (ret <= 0) { | |
809 | ERR("Kconsumerd closed the command socket"); | |
810 | goto error; | |
6f61d021 | 811 | } |
1d4b027a | 812 | |
712ea556 DG |
813 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
814 | ||
1d4b027a | 815 | error: |
6f61d021 | 816 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
817 | if (kconsumerd_err_sock) { |
818 | close(kconsumerd_err_sock); | |
819 | } | |
820 | if (kconsumerd_cmd_sock) { | |
821 | close(kconsumerd_cmd_sock); | |
822 | } | |
823 | if (sock) { | |
824 | close(sock); | |
825 | } | |
826 | ||
827 | unlink(kconsumerd_err_unix_sock_path); | |
828 | unlink(kconsumerd_cmd_unix_sock_path); | |
829 | ||
830 | kconsumerd_pid = 0; | |
1d4b027a DG |
831 | return NULL; |
832 | } | |
833 | ||
834 | /* | |
099e26bd DG |
835 | * Reallocate the apps command pollfd structure of nb_fd size. |
836 | * | |
837 | * The first two fds must be there at all time. | |
838 | */ | |
0177d773 DG |
839 | static int update_apps_cmd_pollfd(unsigned int nb_fd, unsigned int old_nb_fd, |
840 | struct pollfd **pollfd) | |
099e26bd | 841 | { |
0177d773 DG |
842 | int i, count; |
843 | struct pollfd *old_pollfd = NULL; | |
844 | ||
099e26bd DG |
845 | /* Can't accept pollfd less than 2 */ |
846 | if (nb_fd < 2) { | |
847 | goto end; | |
848 | } | |
849 | ||
0177d773 DG |
850 | if (*pollfd) { |
851 | /* Save pointer */ | |
852 | old_pollfd = *pollfd; | |
853 | } | |
854 | ||
855 | *pollfd = malloc(nb_fd * sizeof(struct pollfd)); | |
099e26bd | 856 | if (*pollfd == NULL) { |
0177d773 | 857 | perror("malloc manage apps pollfd"); |
099e26bd DG |
858 | goto error; |
859 | } | |
860 | ||
861 | /* First fd is always the quit pipe */ | |
862 | (*pollfd)[0].fd = thread_quit_pipe[0]; | |
863 | /* Apps command pipe */ | |
864 | (*pollfd)[1].fd = apps_cmd_pipe[0]; | |
865 | (*pollfd)[1].events = POLLIN; | |
866 | ||
0177d773 DG |
867 | /* Start count after the two pipes below */ |
868 | count = 2; | |
869 | for (i = 2; i < old_nb_fd; i++) { | |
870 | /* Add to new pollfd */ | |
871 | if (old_pollfd[i].fd != -1) { | |
872 | (*pollfd)[count].fd = old_pollfd[i].fd; | |
873 | (*pollfd)[count].events = POLLHUP | POLLNVAL | POLLERR; | |
874 | count++; | |
875 | } | |
876 | ||
877 | if (count > nb_fd) { | |
878 | ERR("Updating poll fd wrong size"); | |
879 | goto error; | |
880 | } | |
881 | } | |
882 | ||
733bb3da DG |
883 | if (nb_fd < 2) { |
884 | /* | |
885 | * There should *always* be at least two fds in the pollfd. This safety | |
886 | * check make sure the poll() will actually try on those two pipes at | |
887 | * best which are the thread_quit_pipe and apps_cmd_pipe. | |
888 | */ | |
889 | nb_fd = 2; | |
890 | } | |
891 | ||
0177d773 DG |
892 | /* Destroy old pollfd */ |
893 | free(old_pollfd); | |
894 | ||
099e26bd DG |
895 | DBG("Apps cmd pollfd realloc of size %d", nb_fd); |
896 | ||
897 | end: | |
898 | return 0; | |
899 | ||
900 | error: | |
0177d773 DG |
901 | /* Destroy old pollfd */ |
902 | free(old_pollfd); | |
099e26bd DG |
903 | return -1; |
904 | } | |
905 | ||
099e26bd DG |
906 | /* |
907 | * This thread manage application communication. | |
1d4b027a DG |
908 | */ |
909 | static void *thread_manage_apps(void *data) | |
099e26bd | 910 | { |
28ba3f4e | 911 | int i, ret, current_nb_fd; |
099e26bd DG |
912 | unsigned int nb_fd = 2; |
913 | int update_poll_flag = 1; | |
914 | struct pollfd *pollfd = NULL; | |
915 | struct ust_command ust_cmd; | |
916 | ||
917 | DBG("[thread] Manage application started"); | |
918 | ||
919 | ust_cmd.sock = -1; | |
28ba3f4e | 920 | current_nb_fd = nb_fd; |
099e26bd DG |
921 | |
922 | while (1) { | |
923 | /* See if we have a valid socket to add to pollfd */ | |
924 | if (ust_cmd.sock != -1) { | |
925 | nb_fd++; | |
926 | update_poll_flag = 1; | |
927 | } | |
928 | ||
929 | /* The pollfd struct must be updated */ | |
930 | if (update_poll_flag) { | |
28ba3f4e | 931 | ret = update_apps_cmd_pollfd(nb_fd, current_nb_fd, &pollfd); |
099e26bd DG |
932 | if (ret < 0) { |
933 | /* malloc failed so we quit */ | |
934 | goto error; | |
935 | } | |
0177d773 | 936 | |
099e26bd DG |
937 | if (ust_cmd.sock != -1) { |
938 | /* Update pollfd with the new UST socket */ | |
939 | DBG("Adding sock %d to apps cmd pollfd", ust_cmd.sock); | |
940 | pollfd[nb_fd - 1].fd = ust_cmd.sock; | |
0177d773 | 941 | pollfd[nb_fd - 1].events = POLLHUP | POLLNVAL | POLLERR; |
099e26bd DG |
942 | ust_cmd.sock = -1; |
943 | } | |
944 | } | |
945 | ||
946 | DBG("Apps thread polling on %d fds", nb_fd); | |
947 | ||
948 | /* Inifinite blocking call, waiting for transmission */ | |
949 | ret = poll(pollfd, nb_fd, -1); | |
950 | if (ret < 0) { | |
951 | perror("poll apps thread"); | |
952 | goto error; | |
953 | } | |
954 | ||
955 | /* Thread quit pipe has been closed. Killing thread. */ | |
956 | if (pollfd[0].revents == POLLNVAL) { | |
957 | goto error; | |
0177d773 DG |
958 | } else { |
959 | /* apps_cmd_pipe pipe events */ | |
960 | switch (pollfd[1].revents) { | |
961 | case POLLERR: | |
962 | ERR("Apps command pipe poll error"); | |
099e26bd | 963 | goto error; |
0177d773 DG |
964 | case POLLIN: |
965 | /* Empty pipe */ | |
966 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
967 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
968 | perror("read apps cmd pipe"); | |
969 | goto error; | |
970 | } | |
099e26bd | 971 | |
0177d773 DG |
972 | /* Register applicaton to the session daemon */ |
973 | ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock); | |
974 | if (ret < 0) { | |
975 | /* Only critical ENOMEM error can be returned here */ | |
976 | goto error; | |
977 | } | |
099e26bd | 978 | |
0177d773 DG |
979 | ret = ustctl_register_done(ust_cmd.sock); |
980 | if (ret < 0) { | |
981 | /* | |
982 | * If the registration is not possible, we simply unregister | |
983 | * the apps and continue | |
984 | */ | |
985 | unregister_traceable_app(ust_cmd.sock); | |
986 | } | |
987 | break; | |
099e26bd DG |
988 | } |
989 | } | |
990 | ||
28ba3f4e DG |
991 | current_nb_fd = nb_fd; |
992 | for (i = 2; i < current_nb_fd; i++) { | |
099e26bd DG |
993 | /* Apps socket is closed/hungup */ |
994 | switch (pollfd[i].revents) { | |
0177d773 | 995 | case POLLERR: |
099e26bd | 996 | case POLLHUP: |
0177d773 | 997 | case POLLNVAL: |
099e26bd DG |
998 | /* Pipe closed */ |
999 | unregister_traceable_app(pollfd[i].fd); | |
0177d773 DG |
1000 | /* Indicate to remove this fd from the pollfd */ |
1001 | pollfd[i].fd = -1; | |
099e26bd | 1002 | nb_fd--; |
0177d773 | 1003 | break; |
099e26bd DG |
1004 | } |
1005 | } | |
1006 | ||
28ba3f4e | 1007 | if (nb_fd != current_nb_fd) { |
099e26bd DG |
1008 | update_poll_flag = 1; |
1009 | } | |
1010 | } | |
1011 | ||
1012 | error: | |
1013 | DBG("Application communication apps dying"); | |
1014 | close(apps_cmd_pipe[0]); | |
1015 | close(apps_cmd_pipe[1]); | |
1016 | ||
1017 | free(pollfd); | |
1018 | ||
1019 | return NULL; | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Dispatch request from the registration threads to the application | |
1024 | * communication thread. | |
1025 | */ | |
1026 | static void *thread_dispatch_ust_registration(void *data) | |
1027 | { | |
1028 | int ret; | |
1029 | struct cds_wfq_node *node; | |
1030 | struct ust_command *ust_cmd = NULL; | |
1031 | ||
1032 | DBG("[thread] Dispatch UST command started"); | |
1033 | ||
1034 | while (!dispatch_thread_exit) { | |
1035 | /* Atomically prepare the queue futex */ | |
1036 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1037 | ||
1038 | do { | |
1039 | /* Dequeue command for registration */ | |
1040 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1041 | if (node == NULL) { | |
1042 | DBG("Waked up but nothing in the UST command queue"); | |
1043 | /* Continue thread execution */ | |
1044 | break; | |
1045 | } | |
1046 | ||
1047 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1048 | ||
2f50c8a3 DG |
1049 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1050 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1051 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1052 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1053 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1054 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1055 | /* |
1056 | * Inform apps thread of the new application registration. This | |
1057 | * call is blocking so we can be assured that the data will be read | |
1058 | * at some point in time or wait to the end of the world :) | |
1059 | */ | |
1060 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1061 | sizeof(struct ust_command)); | |
1062 | if (ret < 0) { | |
1063 | perror("write apps cmd pipe"); | |
1064 | if (errno == EBADF) { | |
1065 | /* | |
1066 | * We can't inform the application thread to process | |
1067 | * registration. We will exit or else application | |
1068 | * registration will not occur and tracing will never | |
1069 | * start. | |
1070 | */ | |
1071 | goto error; | |
1072 | } | |
1073 | } | |
1074 | free(ust_cmd); | |
1075 | } while (node != NULL); | |
1076 | ||
1077 | /* Futex wait on queue. Blocking call on futex() */ | |
1078 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1079 | } | |
1080 | ||
1081 | error: | |
1082 | DBG("Dispatch thread dying"); | |
1083 | return NULL; | |
1084 | } | |
1085 | ||
1086 | /* | |
1087 | * This thread manage application registration. | |
1088 | */ | |
1089 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1090 | { |
273ea72c DG |
1091 | int sock = 0, ret; |
1092 | struct pollfd pollfd[2]; | |
099e26bd DG |
1093 | /* |
1094 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1095 | * freed in the manage apps thread. | |
1096 | */ | |
1097 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1098 | |
099e26bd | 1099 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1100 | |
1101 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1102 | if (ret < 0) { | |
1103 | goto error; | |
1104 | } | |
1105 | ||
273ea72c DG |
1106 | /* First fd is always the quit pipe */ |
1107 | pollfd[0].fd = thread_quit_pipe[0]; | |
1108 | ||
1109 | /* Apps socket */ | |
1110 | pollfd[1].fd = apps_sock; | |
1111 | pollfd[1].events = POLLIN; | |
1112 | ||
1d4b027a | 1113 | /* Notify all applications to register */ |
0fdd1e2c DG |
1114 | ret = notify_ust_apps(1); |
1115 | if (ret < 0) { | |
1116 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
1117 | "Execution continues but there might be problem for already running\n" | |
1118 | "applications that wishes to register."); | |
1119 | } | |
1d4b027a DG |
1120 | |
1121 | while (1) { | |
1122 | DBG("Accepting application registration"); | |
273ea72c DG |
1123 | |
1124 | /* Inifinite blocking call, waiting for transmission */ | |
1125 | ret = poll(pollfd, 2, -1); | |
1126 | if (ret < 0) { | |
099e26bd | 1127 | perror("poll register apps thread"); |
273ea72c DG |
1128 | goto error; |
1129 | } | |
1130 | ||
1131 | /* Thread quit pipe has been closed. Killing thread. */ | |
1132 | if (pollfd[0].revents == POLLNVAL) { | |
1133 | goto error; | |
1134 | } else if (pollfd[1].revents == POLLERR) { | |
099e26bd | 1135 | ERR("Register apps socket poll error"); |
273ea72c DG |
1136 | goto error; |
1137 | } | |
1138 | ||
1d4b027a DG |
1139 | sock = lttcomm_accept_unix_sock(apps_sock); |
1140 | if (sock < 0) { | |
1141 | goto error; | |
1142 | } | |
1143 | ||
099e26bd DG |
1144 | /* Create UST registration command for enqueuing */ |
1145 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1146 | if (ust_cmd == NULL) { | |
1147 | perror("ust command malloc"); | |
1148 | goto error; | |
1149 | } | |
1150 | ||
273ea72c | 1151 | /* |
099e26bd DG |
1152 | * Using message-based transmissions to ensure we don't have to deal |
1153 | * with partially received messages. | |
1d4b027a | 1154 | */ |
099e26bd DG |
1155 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1156 | sizeof(struct ust_register_msg)); | |
2f50c8a3 DG |
1157 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { |
1158 | if (ret < 0) { | |
1159 | perror("lttcomm_recv_unix_sock register apps"); | |
1160 | } else { | |
1161 | ERR("Wrong size received on apps register"); | |
1162 | } | |
099e26bd DG |
1163 | free(ust_cmd); |
1164 | close(sock); | |
1d4b027a DG |
1165 | continue; |
1166 | } | |
1167 | ||
099e26bd DG |
1168 | ust_cmd->sock = sock; |
1169 | ||
2f50c8a3 DG |
1170 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1171 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1172 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1173 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1174 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1175 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1176 | /* |
1177 | * Lock free enqueue the registration request. | |
1178 | * The red pill has been taken! This apps will be part of the *system* | |
1179 | */ | |
1180 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1181 | ||
1182 | /* | |
1183 | * Wake the registration queue futex. | |
1184 | * Implicit memory barrier with the exchange in cds_wfq_enqueue. | |
1185 | */ | |
1186 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1d4b027a DG |
1187 | } |
1188 | ||
1189 | error: | |
0fdd1e2c DG |
1190 | DBG("UST Registration thread dying"); |
1191 | ||
1192 | /* Notify that the registration thread is gone */ | |
1193 | notify_ust_apps(0); | |
1194 | ||
1195 | close(apps_sock); | |
1196 | close(sock); | |
1d4b027a | 1197 | |
273ea72c | 1198 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1199 | |
1d4b027a DG |
1200 | return NULL; |
1201 | } | |
1202 | ||
8c0faa1d | 1203 | /* |
d063d709 DG |
1204 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1205 | * exec or it will fails. | |
8c0faa1d | 1206 | */ |
693bd40b | 1207 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1208 | { |
1209 | int ret; | |
1210 | ||
1211 | /* Setup semaphore */ | |
1212 | sem_init(&kconsumerd_sem, 0, 0); | |
1213 | ||
1d4b027a | 1214 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
1215 | if (ret != 0) { |
1216 | perror("pthread_create kconsumerd"); | |
1217 | goto error; | |
1218 | } | |
1219 | ||
693bd40b | 1220 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1221 | sem_wait(&kconsumerd_sem); |
1222 | ||
712ea556 DG |
1223 | if (kconsumerd_pid == 0) { |
1224 | ERR("Kconsumerd did not start"); | |
1225 | goto error; | |
1226 | } | |
1227 | ||
8c0faa1d DG |
1228 | return 0; |
1229 | ||
1230 | error: | |
712ea556 | 1231 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1232 | return ret; |
1233 | } | |
1234 | ||
d9800920 DG |
1235 | /* |
1236 | * Join kernel consumer thread | |
1237 | */ | |
cf3af59e MD |
1238 | static int join_kconsumerd_thread(void) |
1239 | { | |
1240 | void *status; | |
1241 | int ret; | |
1242 | ||
1243 | if (kconsumerd_pid != 0) { | |
1244 | ret = kill(kconsumerd_pid, SIGTERM); | |
1245 | if (ret) { | |
1246 | ERR("Error killing kconsumerd"); | |
1247 | return ret; | |
1248 | } | |
1249 | return pthread_join(kconsumerd_thread, &status); | |
1250 | } else { | |
1251 | return 0; | |
1252 | } | |
1253 | } | |
1254 | ||
8c0faa1d | 1255 | /* |
d063d709 | 1256 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1257 | * |
d063d709 | 1258 | * Return pid if successful else -1. |
8c0faa1d | 1259 | */ |
693bd40b | 1260 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1261 | { |
1262 | int ret; | |
1263 | pid_t pid; | |
53086306 | 1264 | const char *verbosity; |
8c0faa1d | 1265 | |
c49dc785 DG |
1266 | DBG("Spawning kconsumerd"); |
1267 | ||
8c0faa1d DG |
1268 | pid = fork(); |
1269 | if (pid == 0) { | |
1270 | /* | |
1271 | * Exec kconsumerd. | |
1272 | */ | |
31f73cc9 | 1273 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1274 | verbosity = "--verbose"; |
1275 | } else { | |
1276 | verbosity = "--quiet"; | |
1277 | } | |
1278 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1279 | if (errno != 0) { |
1280 | perror("kernel start consumer exec"); | |
1281 | } | |
1282 | exit(EXIT_FAILURE); | |
1283 | } else if (pid > 0) { | |
1284 | ret = pid; | |
1285 | goto error; | |
1286 | } else { | |
1287 | perror("kernel start consumer fork"); | |
1288 | ret = -errno; | |
1289 | goto error; | |
1290 | } | |
1291 | ||
1292 | error: | |
1293 | return ret; | |
1294 | } | |
1295 | ||
693bd40b | 1296 | /* |
d063d709 | 1297 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1298 | */ |
1299 | static int start_kconsumerd(void) | |
1300 | { | |
1301 | int ret; | |
1302 | ||
693bd40b | 1303 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1304 | if (kconsumerd_pid != 0) { |
817153bb | 1305 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1306 | goto end; |
1307 | } | |
693bd40b | 1308 | |
c49dc785 DG |
1309 | ret = spawn_kconsumerd(); |
1310 | if (ret < 0) { | |
1311 | ERR("Spawning kconsumerd failed"); | |
1312 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1313 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1314 | goto error; | |
693bd40b | 1315 | } |
c49dc785 DG |
1316 | |
1317 | /* Setting up the global kconsumerd_pid */ | |
1318 | kconsumerd_pid = ret; | |
693bd40b DG |
1319 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1320 | ||
6f61d021 DG |
1321 | DBG("Kconsumerd pid %d", ret); |
1322 | ||
693bd40b | 1323 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1324 | ret = spawn_kconsumerd_thread(); |
1325 | if (ret < 0) { | |
1326 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1327 | goto error; |
1328 | } | |
1329 | ||
c49dc785 | 1330 | end: |
693bd40b DG |
1331 | return 0; |
1332 | ||
1333 | error: | |
1334 | return ret; | |
1335 | } | |
1336 | ||
b73401da | 1337 | /* |
d063d709 | 1338 | * modprobe_kernel_modules |
b73401da DG |
1339 | */ |
1340 | static int modprobe_kernel_modules(void) | |
1341 | { | |
ab147185 | 1342 | int ret = 0, i; |
b73401da DG |
1343 | char modprobe[256]; |
1344 | ||
ab147185 MD |
1345 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1346 | ret = snprintf(modprobe, sizeof(modprobe), | |
1347 | "/sbin/modprobe %s%s", | |
1348 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1349 | kernel_modules_list[i].name); | |
b73401da DG |
1350 | if (ret < 0) { |
1351 | perror("snprintf modprobe"); | |
1352 | goto error; | |
1353 | } | |
ab147185 | 1354 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1355 | ret = system(modprobe); |
ab147185 MD |
1356 | if (ret == -1) { |
1357 | ERR("Unable to launch modprobe for module %s", | |
1358 | kernel_modules_list[i].name); | |
1359 | } else if (kernel_modules_list[i].required | |
d9800920 | 1360 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1361 | ERR("Unable to load module %s", |
1362 | kernel_modules_list[i].name); | |
1363 | } else { | |
1364 | DBG("Modprobe successfully %s", | |
1365 | kernel_modules_list[i].name); | |
1366 | } | |
1367 | } | |
1368 | ||
1369 | error: | |
1370 | return ret; | |
1371 | } | |
1372 | ||
b73401da | 1373 | /* |
d063d709 | 1374 | * mount_debugfs |
b73401da DG |
1375 | */ |
1376 | static int mount_debugfs(char *path) | |
1377 | { | |
1378 | int ret; | |
1379 | char *type = "debugfs"; | |
1380 | ||
996b65c8 | 1381 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1382 | if (ret < 0) { |
1383 | goto error; | |
1384 | } | |
1385 | ||
1386 | ret = mount(type, path, type, 0, NULL); | |
1387 | if (ret < 0) { | |
1388 | perror("mount debugfs"); | |
1389 | goto error; | |
1390 | } | |
1391 | ||
1392 | DBG("Mounted debugfs successfully at %s", path); | |
1393 | ||
1394 | error: | |
1395 | return ret; | |
1396 | } | |
1397 | ||
8c0faa1d | 1398 | /* |
d063d709 | 1399 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1400 | */ |
f3ed775e | 1401 | static void init_kernel_tracer(void) |
8c0faa1d | 1402 | { |
b73401da DG |
1403 | int ret; |
1404 | char *proc_mounts = "/proc/mounts"; | |
1405 | char line[256]; | |
1406 | char *debugfs_path = NULL, *lttng_path; | |
1407 | FILE *fp; | |
1408 | ||
1409 | /* Detect debugfs */ | |
1410 | fp = fopen(proc_mounts, "r"); | |
1411 | if (fp == NULL) { | |
1412 | ERR("Unable to probe %s", proc_mounts); | |
1413 | goto error; | |
1414 | } | |
1415 | ||
1416 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1417 | if (strstr(line, "debugfs") != NULL) { | |
1418 | /* Remove first string */ | |
1419 | strtok(line, " "); | |
1420 | /* Dup string here so we can reuse line later on */ | |
1421 | debugfs_path = strdup(strtok(NULL, " ")); | |
1422 | DBG("Got debugfs path : %s", debugfs_path); | |
1423 | break; | |
1424 | } | |
1425 | } | |
1426 | ||
1427 | fclose(fp); | |
1428 | ||
1429 | /* Mount debugfs if needded */ | |
1430 | if (debugfs_path == NULL) { | |
1431 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1432 | if (ret < 0) { | |
1433 | perror("asprintf debugfs path"); | |
1434 | goto error; | |
1435 | } | |
1436 | ret = mount_debugfs(debugfs_path); | |
1437 | if (ret < 0) { | |
1438 | goto error; | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | /* Modprobe lttng kernel modules */ | |
1443 | ret = modprobe_kernel_modules(); | |
1444 | if (ret < 0) { | |
1445 | goto error; | |
1446 | } | |
1447 | ||
1448 | /* Setup lttng kernel path */ | |
1449 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1450 | if (ret < 0) { | |
1451 | perror("asprintf lttng path"); | |
1452 | goto error; | |
1453 | } | |
1454 | ||
1455 | /* Open debugfs lttng */ | |
1456 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1457 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1458 | DBG("Failed to open %s", lttng_path); |
1459 | goto error; | |
8c0faa1d DG |
1460 | } |
1461 | ||
b73401da DG |
1462 | free(lttng_path); |
1463 | free(debugfs_path); | |
f3ed775e | 1464 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1465 | return; |
1466 | ||
1467 | error: | |
1468 | if (lttng_path) { | |
1469 | free(lttng_path); | |
1470 | } | |
1471 | if (debugfs_path) { | |
1472 | free(debugfs_path); | |
1473 | } | |
1474 | WARN("No kernel tracer available"); | |
1475 | kernel_tracer_fd = 0; | |
1476 | return; | |
f3ed775e | 1477 | } |
33a2b854 | 1478 | |
f3ed775e | 1479 | /* |
d063d709 DG |
1480 | * Start tracing by creating trace directory and sending FDs to the kernel |
1481 | * consumer. | |
f3ed775e DG |
1482 | */ |
1483 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1484 | { | |
f40799e8 | 1485 | int ret = 0; |
8c0faa1d | 1486 | |
f3ed775e | 1487 | if (session->kconsumer_fds_sent == 0) { |
d9800920 DG |
1488 | /* |
1489 | * Assign default kernel consumer if no consumer assigned to the kernel | |
1490 | * session. At this point, it's NOT suppose to be 0 but this is an extra | |
1491 | * security check. | |
1492 | */ | |
1493 | if (session->consumer_fd == 0) { | |
1494 | session->consumer_fd = kconsumerd_cmd_sock; | |
1495 | } | |
1496 | ||
1497 | ret = send_kconsumerd_fds(session); | |
f3ed775e DG |
1498 | if (ret < 0) { |
1499 | ERR("Send kconsumerd fds failed"); | |
1500 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1501 | goto error; | |
1502 | } | |
1d4b027a | 1503 | |
f3ed775e DG |
1504 | session->kconsumer_fds_sent = 1; |
1505 | } | |
1d4b027a DG |
1506 | |
1507 | error: | |
1508 | return ret; | |
8c0faa1d DG |
1509 | } |
1510 | ||
7a485870 DG |
1511 | /* |
1512 | * Notify kernel thread to update it's pollfd. | |
1513 | */ | |
1514 | static int notify_kernel_pollfd(void) | |
1515 | { | |
1516 | int ret; | |
1517 | ||
1518 | /* Inform kernel thread of the new kernel channel */ | |
1519 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1520 | if (ret < 0) { | |
1521 | perror("write kernel poll pipe"); | |
1522 | } | |
1523 | ||
1524 | return ret; | |
1525 | } | |
1526 | ||
8c0faa1d | 1527 | /* |
d063d709 | 1528 | * Allocate a channel structure and fill it. |
8c0faa1d | 1529 | */ |
b389abbe MD |
1530 | static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type, |
1531 | char *name) | |
8c0faa1d | 1532 | { |
f3ed775e | 1533 | struct lttng_channel *chan; |
1d4b027a | 1534 | |
f3ed775e DG |
1535 | chan = malloc(sizeof(struct lttng_channel)); |
1536 | if (chan == NULL) { | |
1537 | perror("init channel malloc"); | |
1538 | goto error; | |
8c0faa1d | 1539 | } |
1d4b027a | 1540 | |
ed8f384d | 1541 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1542 | perror("snprintf channel name"); |
b389abbe | 1543 | goto error; |
f3ed775e DG |
1544 | } |
1545 | ||
1546 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
f3ed775e DG |
1547 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
1548 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1d4b027a | 1549 | |
b389abbe MD |
1550 | switch (domain_type) { |
1551 | case LTTNG_DOMAIN_KERNEL: | |
1552 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
1553 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
1554 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1555 | break; | |
1556 | /* TODO: add UST */ | |
1557 | default: | |
1558 | goto error; /* Not implemented */ | |
1559 | } | |
1560 | ||
f3ed775e | 1561 | return chan; |
b389abbe MD |
1562 | |
1563 | error: | |
1564 | free(chan); | |
1565 | return NULL; | |
8c0faa1d DG |
1566 | } |
1567 | ||
0177d773 DG |
1568 | /* |
1569 | * Create an UST session and add it to the session ust list. | |
1570 | */ | |
1571 | static int create_ust_session(pid_t pid, struct ltt_session *session) | |
1572 | { | |
1573 | int ret = -1; | |
1574 | struct ltt_ust_session *lus; | |
1575 | ||
1576 | DBG("Creating UST session"); | |
1577 | ||
1578 | lus = trace_ust_create_session(session->path, pid); | |
1579 | if (lus == NULL) { | |
1580 | goto error; | |
1581 | } | |
1582 | ||
1583 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1584 | geteuid(), allowed_group()); | |
1585 | if (ret < 0) { | |
1586 | if (ret != -EEXIST) { | |
1587 | ERR("Trace directory creation error"); | |
1588 | goto error; | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | /* Create session on the UST tracer */ | |
1593 | ret = ustctl_create_session(lus); | |
1594 | if (ret < 0) { | |
1595 | goto error; | |
1596 | } | |
1597 | ||
1598 | return 0; | |
1599 | ||
1600 | error: | |
1601 | free(lus); | |
1602 | return ret; | |
1603 | } | |
1604 | ||
333f285e | 1605 | /* |
d063d709 | 1606 | * Create a kernel tracer session then create the default channel. |
333f285e | 1607 | */ |
f3ed775e | 1608 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1609 | { |
f3ed775e | 1610 | int ret; |
f3ed775e DG |
1611 | |
1612 | DBG("Creating kernel session"); | |
1613 | ||
1614 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1615 | if (ret < 0) { | |
1616 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1617 | goto error; | |
333f285e DG |
1618 | } |
1619 | ||
d9800920 DG |
1620 | /* Set kernel consumer socket fd */ |
1621 | if (kconsumerd_cmd_sock) { | |
1622 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1623 | } | |
1624 | ||
63053e7c DG |
1625 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1626 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1627 | if (ret < 0) { |
996b65c8 | 1628 | if (ret != -EEXIST) { |
7a485870 DG |
1629 | ERR("Trace directory creation error"); |
1630 | goto error; | |
1631 | } | |
1632 | } | |
1633 | ||
f3ed775e DG |
1634 | error: |
1635 | return ret; | |
333f285e DG |
1636 | } |
1637 | ||
6c9cc2ab DG |
1638 | /* |
1639 | * Using the session list, filled a lttng_session array to send back to the | |
1640 | * client for session listing. | |
1641 | * | |
1642 | * The session list lock MUST be acquired before calling this function. Use | |
1643 | * lock_session_list() and unlock_session_list(). | |
1644 | */ | |
1645 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1646 | { | |
1647 | int i = 0; | |
1648 | struct ltt_session *session; | |
1649 | ||
1650 | DBG("Getting all available session"); | |
1651 | /* | |
1652 | * Iterate over session list and append data after the control struct in | |
1653 | * the buffer. | |
1654 | */ | |
1655 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1656 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1657 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1658 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1659 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1660 | i++; |
1661 | } | |
1662 | } | |
1663 | ||
9f19cc17 DG |
1664 | /* |
1665 | * Fill lttng_channel array of all channels. | |
1666 | */ | |
1667 | static void list_lttng_channels(struct ltt_session *session, | |
1668 | struct lttng_channel *channels) | |
1669 | { | |
1670 | int i = 0; | |
1671 | struct ltt_kernel_channel *kchan; | |
1672 | ||
1673 | DBG("Listing channels for session %s", session->name); | |
1674 | ||
1675 | /* Kernel channels */ | |
1676 | if (session->kernel_session != NULL) { | |
1677 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1678 | /* Copy lttng_channel struct to array */ | |
1679 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1680 | channels[i].enabled = kchan->enabled; | |
1681 | i++; | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | /* TODO: Missing UST listing */ | |
1686 | } | |
1687 | ||
1688 | /* | |
1689 | * Fill lttng_event array of all events in the channel. | |
1690 | */ | |
1691 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1692 | struct lttng_event *events) | |
1693 | { | |
1694 | /* | |
1695 | * TODO: This is ONLY kernel. Need UST support. | |
1696 | */ | |
1697 | int i = 0; | |
1698 | struct ltt_kernel_event *event; | |
1699 | ||
1700 | DBG("Listing events for channel %s", kchan->channel->name); | |
1701 | ||
1702 | /* Kernel channels */ | |
1703 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1704 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1705 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1706 | events[i].enabled = event->enabled; |
1707 | switch (event->event->instrumentation) { | |
1708 | case LTTNG_KERNEL_TRACEPOINT: | |
1709 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1710 | break; | |
1711 | case LTTNG_KERNEL_KPROBE: | |
1712 | case LTTNG_KERNEL_KRETPROBE: | |
1713 | events[i].type = LTTNG_EVENT_PROBE; | |
1714 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1715 | sizeof(struct lttng_kernel_kprobe)); | |
1716 | break; | |
1717 | case LTTNG_KERNEL_FUNCTION: | |
1718 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1719 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1720 | sizeof(struct lttng_kernel_function)); | |
1721 | break; | |
1722 | } | |
1723 | i++; | |
1724 | } | |
1725 | } | |
1726 | ||
fac6795d | 1727 | /* |
d063d709 DG |
1728 | * Process the command requested by the lttng client within the command |
1729 | * context structure. This function make sure that the return structure (llm) | |
1730 | * is set and ready for transmission before returning. | |
fac6795d | 1731 | * |
e065084a | 1732 | * Return any error encountered or 0 for success. |
fac6795d | 1733 | */ |
5461b305 | 1734 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1735 | { |
f40799e8 | 1736 | int ret = LTTCOMM_OK; |
fac6795d | 1737 | |
5461b305 | 1738 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1739 | |
63053e7c DG |
1740 | /* |
1741 | * Commands that DO NOT need a session. | |
1742 | */ | |
5461b305 | 1743 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1744 | case LTTNG_CREATE_SESSION: |
1745 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1746 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1747 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1748 | break; |
1749 | default: | |
42abccdb DG |
1750 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1751 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1752 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1753 | /* If session name not found */ |
42abccdb | 1754 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1755 | ret = LTTCOMM_SESS_NOT_FOUND; |
1756 | } else { /* If no session name specified */ | |
1757 | ret = LTTCOMM_SELECT_SESS; | |
1758 | } | |
5461b305 | 1759 | goto error; |
b5541356 DG |
1760 | } else { |
1761 | /* Acquire lock for the session */ | |
1762 | lock_session(cmd_ctx->session); | |
379473d2 | 1763 | } |
5e16da05 | 1764 | break; |
379473d2 DG |
1765 | } |
1766 | ||
f3ed775e | 1767 | /* |
d0254c7c | 1768 | * Check domain type for specific "pre-action". |
f3ed775e | 1769 | */ |
0d0c377a DG |
1770 | switch (cmd_ctx->lsm->domain.type) { |
1771 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1772 | /* Kernel tracer check */ |
20fe2104 | 1773 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1774 | init_kernel_tracer(); |
1775 | if (kernel_tracer_fd == 0) { | |
1776 | ret = LTTCOMM_KERN_NA; | |
1777 | goto error; | |
1778 | } | |
20fe2104 | 1779 | } |
f3ed775e | 1780 | /* Need a session for kernel command */ |
d0254c7c | 1781 | switch (cmd_ctx->lsm->cmd_type) { |
d9800920 | 1782 | case LTTNG_CALIBRATE: |
d0254c7c MD |
1783 | case LTTNG_CREATE_SESSION: |
1784 | case LTTNG_LIST_SESSIONS: | |
1785 | case LTTNG_LIST_TRACEPOINTS: | |
d0254c7c MD |
1786 | break; |
1787 | default: | |
1788 | if (cmd_ctx->session->kernel_session == NULL) { | |
1789 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1790 | if (ret < 0) { |
d0254c7c | 1791 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1792 | goto error; |
1793 | } | |
d0254c7c | 1794 | /* Start the kernel consumer daemon */ |
d9800920 DG |
1795 | if (kconsumerd_pid == 0 && |
1796 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
d0254c7c MD |
1797 | ret = start_kconsumerd(); |
1798 | if (ret < 0) { | |
1799 | goto error; | |
1800 | } | |
1801 | } | |
f3ed775e DG |
1802 | } |
1803 | } | |
0d0c377a | 1804 | break; |
0fdd1e2c DG |
1805 | case LTTNG_DOMAIN_UST_PID: |
1806 | break; | |
0d0c377a DG |
1807 | default: |
1808 | break; | |
20fe2104 DG |
1809 | } |
1810 | ||
fac6795d | 1811 | /* Process by command type */ |
5461b305 | 1812 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1813 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1814 | { |
b579acd9 | 1815 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1816 | |
1817 | /* Setup lttng message with no payload */ | |
1818 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1819 | if (ret < 0) { | |
1820 | goto setup_error; | |
1821 | } | |
1822 | ||
b579acd9 DG |
1823 | switch (cmd_ctx->lsm->domain.type) { |
1824 | case LTTNG_DOMAIN_KERNEL: | |
1825 | /* Create Kernel context */ | |
1826 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1827 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1828 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1829 | strncpy(kctx.u.perf_counter.name, | |
1830 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1831 | LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1832 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
b579acd9 DG |
1833 | |
1834 | /* Add kernel context to kernel tracer. See context.c */ | |
1835 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1836 | cmd_ctx->lsm->u.context.event_name, | |
1837 | cmd_ctx->lsm->u.context.channel_name); | |
1838 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1839 | goto error; |
1840 | } | |
b579acd9 DG |
1841 | break; |
1842 | default: | |
1843 | /* TODO: Userspace tracing */ | |
1844 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1845 | goto error; |
d65106b1 DG |
1846 | } |
1847 | ||
1848 | ret = LTTCOMM_OK; | |
1849 | break; | |
1850 | } | |
0b97ec54 | 1851 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1852 | { |
0b97ec54 | 1853 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1854 | |
1855 | /* Setup lttng message with no payload */ | |
1856 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1857 | if (ret < 0) { | |
1858 | goto setup_error; | |
1859 | } | |
1860 | ||
0b97ec54 DG |
1861 | switch (cmd_ctx->lsm->domain.type) { |
1862 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1863 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
0b97ec54 DG |
1864 | cmd_ctx->session->kernel_session); |
1865 | if (kchan == NULL) { | |
1866 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1867 | goto error; |
0b97ec54 DG |
1868 | } else if (kchan->enabled == 1) { |
1869 | ret = kernel_disable_channel(kchan); | |
1870 | if (ret < 0) { | |
1871 | if (ret != EEXIST) { | |
1872 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1873 | } | |
1874 | goto error; | |
1875 | } | |
26cc6b4e | 1876 | } |
0b97ec54 DG |
1877 | kernel_wait_quiescent(kernel_tracer_fd); |
1878 | break; | |
1879 | default: | |
1880 | /* TODO: Userspace tracing */ | |
1881 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1882 | goto error; | |
26cc6b4e DG |
1883 | } |
1884 | ||
26cc6b4e DG |
1885 | ret = LTTCOMM_OK; |
1886 | break; | |
1887 | } | |
f5177a38 | 1888 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1889 | { |
f5177a38 DG |
1890 | struct ltt_kernel_channel *kchan; |
1891 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1892 | |
1893 | /* Setup lttng message with no payload */ | |
1894 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1895 | if (ret < 0) { | |
1896 | goto setup_error; | |
1897 | } | |
1898 | ||
f5177a38 DG |
1899 | switch (cmd_ctx->lsm->domain.type) { |
1900 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1901 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1902 | cmd_ctx->session->kernel_session); |
1903 | if (kchan == NULL) { | |
1904 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1905 | goto error; |
e953ef25 | 1906 | } |
f5177a38 | 1907 | |
62499ad6 | 1908 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); |
f5177a38 DG |
1909 | if (kevent != NULL) { |
1910 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1911 | kchan->channel->name); | |
1912 | ret = kernel_disable_event(kevent); | |
1913 | if (ret < 0) { | |
1914 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1915 | goto error; | |
1916 | } | |
1917 | } | |
1918 | ||
1919 | kernel_wait_quiescent(kernel_tracer_fd); | |
1920 | break; | |
1921 | default: | |
1922 | /* TODO: Userspace tracing */ | |
1923 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1924 | goto error; | |
e953ef25 DG |
1925 | } |
1926 | ||
19e70852 | 1927 | ret = LTTCOMM_OK; |
e953ef25 DG |
1928 | break; |
1929 | } | |
f5177a38 | 1930 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1931 | { |
f5177a38 DG |
1932 | struct ltt_kernel_channel *kchan; |
1933 | struct ltt_kernel_event *kevent; | |
950131af DG |
1934 | |
1935 | /* Setup lttng message with no payload */ | |
1936 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1937 | if (ret < 0) { | |
1938 | goto setup_error; | |
1939 | } | |
1940 | ||
f5177a38 DG |
1941 | switch (cmd_ctx->lsm->domain.type) { |
1942 | case LTTNG_DOMAIN_KERNEL: | |
1943 | DBG("Disabling all enabled kernel events"); | |
62499ad6 | 1944 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1945 | cmd_ctx->session->kernel_session); |
1946 | if (kchan == NULL) { | |
1947 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1948 | goto error; | |
1949 | } | |
950131af | 1950 | |
f5177a38 DG |
1951 | /* For each event in the kernel session */ |
1952 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1953 | DBG("Disabling kernel event %s for channel %s.", | |
1954 | kevent->event->name, kchan->channel->name); | |
1955 | ret = kernel_disable_event(kevent); | |
1956 | if (ret < 0) { | |
1957 | continue; | |
1958 | } | |
950131af | 1959 | } |
f5177a38 DG |
1960 | |
1961 | /* Quiescent wait after event disable */ | |
1962 | kernel_wait_quiescent(kernel_tracer_fd); | |
1963 | break; | |
1964 | default: | |
1965 | /* TODO: Userspace tracing */ | |
1966 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1967 | goto error; | |
950131af DG |
1968 | } |
1969 | ||
950131af DG |
1970 | ret = LTTCOMM_OK; |
1971 | break; | |
1972 | } | |
0d0c377a | 1973 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 1974 | { |
0d0c377a | 1975 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
1976 | |
1977 | /* Setup lttng message with no payload */ | |
1978 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1979 | if (ret < 0) { | |
1980 | goto setup_error; | |
1981 | } | |
1982 | ||
0d0c377a DG |
1983 | switch (cmd_ctx->lsm->domain.type) { |
1984 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1985 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, |
0d0c377a DG |
1986 | cmd_ctx->session->kernel_session); |
1987 | if (kchan == NULL) { | |
1988 | /* Channel not found, creating it */ | |
1989 | DBG("Creating kernel channel"); | |
7d29a247 | 1990 | |
0d0c377a | 1991 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c DG |
1992 | &cmd_ctx->lsm->u.channel.chan, |
1993 | cmd_ctx->session->kernel_session->trace_path); | |
0d0c377a DG |
1994 | if (ret < 0) { |
1995 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1996 | goto error; | |
1997 | } | |
7d29a247 | 1998 | |
0d0c377a DG |
1999 | /* Notify kernel thread that there is a new channel */ |
2000 | ret = notify_kernel_pollfd(); | |
2001 | if (ret < 0) { | |
2002 | ret = LTTCOMM_FATAL; | |
2003 | goto error; | |
2004 | } | |
2005 | } else if (kchan->enabled == 0) { | |
2006 | ret = kernel_enable_channel(kchan); | |
2007 | if (ret < 0) { | |
2008 | if (ret != EEXIST) { | |
2009 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
2010 | } | |
2011 | goto error; | |
d36b8583 | 2012 | } |
d36b8583 | 2013 | } |
0d0c377a DG |
2014 | |
2015 | kernel_wait_quiescent(kernel_tracer_fd); | |
2016 | break; | |
0177d773 | 2017 | case LTTNG_DOMAIN_UST_PID: |
0fdd1e2c | 2018 | |
0177d773 | 2019 | break; |
0d0c377a | 2020 | default: |
0d0c377a DG |
2021 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2022 | goto error; | |
d36b8583 DG |
2023 | } |
2024 | ||
d36b8583 DG |
2025 | ret = LTTCOMM_OK; |
2026 | break; | |
2027 | } | |
0d0c377a | 2028 | case LTTNG_ENABLE_EVENT: |
894be886 | 2029 | { |
7d29a247 DG |
2030 | char *channel_name; |
2031 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 2032 | struct ltt_kernel_event *kevent; |
7d29a247 | 2033 | struct lttng_channel *chan; |
f3ed775e | 2034 | |
894be886 DG |
2035 | /* Setup lttng message with no payload */ |
2036 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2037 | if (ret < 0) { | |
2038 | goto setup_error; | |
2039 | } | |
2040 | ||
7d29a247 DG |
2041 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2042 | ||
0d0c377a DG |
2043 | switch (cmd_ctx->lsm->domain.type) { |
2044 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2045 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2046 | cmd_ctx->session->kernel_session); |
2047 | if (kchan == NULL) { | |
2048 | DBG("Channel not found. Creating channel %s", channel_name); | |
2049 | ||
2050 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2051 | if (chan == NULL) { | |
2052 | ret = LTTCOMM_FATAL; | |
2053 | goto error; | |
2054 | } | |
2055 | ||
2056 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2057 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2058 | if (ret < 0) { | |
2059 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2060 | goto error; | |
2061 | } | |
62499ad6 | 2062 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2063 | cmd_ctx->session->kernel_session); |
2064 | if (kchan == NULL) { | |
b389abbe MD |
2065 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2066 | channel_name); | |
2067 | ret = LTTCOMM_FATAL; | |
2068 | goto error; | |
7d29a247 | 2069 | } |
b389abbe | 2070 | } |
7d29a247 | 2071 | |
62499ad6 | 2072 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
0d0c377a DG |
2073 | if (kevent == NULL) { |
2074 | DBG("Creating kernel event %s for channel %s.", | |
2075 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
2076 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
2077 | } else { | |
2078 | DBG("Enabling kernel event %s for channel %s.", | |
2079 | kevent->event->name, channel_name); | |
2080 | ret = kernel_enable_event(kevent); | |
2081 | if (ret == -EEXIST) { | |
2082 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
2083 | goto error; |
2084 | } | |
2085 | } | |
f34daff7 | 2086 | |
0d0c377a DG |
2087 | if (ret < 0) { |
2088 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
2089 | goto error; |
2090 | } | |
19e70852 | 2091 | |
0d0c377a DG |
2092 | kernel_wait_quiescent(kernel_tracer_fd); |
2093 | break; | |
2094 | default: | |
2095 | /* TODO: Userspace tracing */ | |
2096 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 2097 | goto error; |
f3ed775e | 2098 | } |
19e70852 | 2099 | ret = LTTCOMM_OK; |
894be886 DG |
2100 | break; |
2101 | } | |
0d0c377a | 2102 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 2103 | { |
9f19cc17 DG |
2104 | int size, i; |
2105 | char *channel_name; | |
7d29a247 | 2106 | struct ltt_kernel_channel *kchan; |
0d0c377a | 2107 | struct ltt_kernel_event *kevent; |
9f19cc17 | 2108 | struct lttng_event *event_list; |
7d29a247 | 2109 | struct lttng_channel *chan; |
33a2b854 DG |
2110 | |
2111 | /* Setup lttng message with no payload */ | |
2112 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2113 | if (ret < 0) { | |
2114 | goto setup_error; | |
2115 | } | |
2116 | ||
2117 | DBG("Enabling all kernel event"); | |
2118 | ||
7d29a247 DG |
2119 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2120 | ||
0d0c377a DG |
2121 | switch (cmd_ctx->lsm->domain.type) { |
2122 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2123 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2124 | cmd_ctx->session->kernel_session); |
2125 | if (kchan == NULL) { | |
2126 | DBG("Channel not found. Creating channel %s", channel_name); | |
2127 | ||
2128 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2129 | if (chan == NULL) { | |
2130 | ret = LTTCOMM_FATAL; | |
2131 | goto error; | |
2132 | } | |
2133 | ||
2134 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2135 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2136 | if (ret < 0) { | |
2137 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2138 | goto error; | |
2139 | } | |
62499ad6 | 2140 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2141 | cmd_ctx->session->kernel_session); |
2142 | if (kchan == NULL) { | |
b389abbe MD |
2143 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2144 | channel_name); | |
2145 | ret = LTTCOMM_FATAL; | |
2146 | goto error; | |
7d29a247 | 2147 | } |
b389abbe | 2148 | } |
7d29a247 | 2149 | |
0d0c377a DG |
2150 | /* For each event in the kernel session */ |
2151 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
2152 | DBG("Enabling kernel event %s for channel %s.", | |
2153 | kevent->event->name, channel_name); | |
2154 | ret = kernel_enable_event(kevent); | |
7d29a247 | 2155 | if (ret < 0) { |
0d0c377a | 2156 | continue; |
7d29a247 DG |
2157 | } |
2158 | } | |
33a2b854 | 2159 | |
0d0c377a DG |
2160 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
2161 | if (size < 0) { | |
2162 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2163 | goto error; | |
f3ed775e | 2164 | } |
f3ed775e | 2165 | |
0d0c377a | 2166 | for (i = 0; i < size; i++) { |
62499ad6 | 2167 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
0d0c377a DG |
2168 | if (kevent == NULL) { |
2169 | /* Default event type for enable all */ | |
2170 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
2171 | /* Enable each single tracepoint event */ | |
2172 | ret = kernel_create_event(&event_list[i], kchan); | |
2173 | if (ret < 0) { | |
2174 | /* Ignore error here and continue */ | |
2175 | } | |
950131af | 2176 | } |
33a2b854 | 2177 | } |
33a2b854 | 2178 | |
0d0c377a DG |
2179 | free(event_list); |
2180 | ||
2181 | /* Quiescent wait after event enable */ | |
2182 | kernel_wait_quiescent(kernel_tracer_fd); | |
2183 | break; | |
2184 | default: | |
2185 | /* TODO: Userspace tracing */ | |
2186 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2187 | goto error; | |
2188 | } | |
33a2b854 DG |
2189 | |
2190 | ret = LTTCOMM_OK; | |
2191 | break; | |
2192 | } | |
052da939 | 2193 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2194 | { |
9f19cc17 | 2195 | struct lttng_event *events; |
052da939 DG |
2196 | ssize_t nb_events = 0; |
2197 | ||
2198 | switch (cmd_ctx->lsm->domain.type) { | |
2199 | case LTTNG_DOMAIN_KERNEL: | |
2200 | DBG("Listing kernel events"); | |
2201 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
2202 | if (nb_events < 0) { | |
2203 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2204 | goto error; | |
2205 | } | |
2206 | break; | |
2207 | default: | |
2208 | /* TODO: Userspace listing */ | |
2209 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2210 | break; | |
2ef84c95 DG |
2211 | } |
2212 | ||
2213 | /* | |
2214 | * Setup lttng message with payload size set to the event list size in | |
2215 | * bytes and then copy list into the llm payload. | |
2216 | */ | |
052da939 | 2217 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2218 | if (ret < 0) { |
052da939 | 2219 | free(events); |
2ef84c95 DG |
2220 | goto setup_error; |
2221 | } | |
2222 | ||
2223 | /* Copy event list into message payload */ | |
9f19cc17 | 2224 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2225 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2226 | |
9f19cc17 | 2227 | free(events); |
2ef84c95 DG |
2228 | |
2229 | ret = LTTCOMM_OK; | |
2230 | break; | |
2231 | } | |
f3ed775e | 2232 | case LTTNG_START_TRACE: |
8c0faa1d DG |
2233 | { |
2234 | struct ltt_kernel_channel *chan; | |
f3ed775e | 2235 | |
8c0faa1d DG |
2236 | /* Setup lttng message with no payload */ |
2237 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2238 | if (ret < 0) { | |
2239 | goto setup_error; | |
2240 | } | |
2241 | ||
f3ed775e DG |
2242 | /* Kernel tracing */ |
2243 | if (cmd_ctx->session->kernel_session != NULL) { | |
2244 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
2245 | DBG("Open kernel metadata"); | |
58a97671 | 2246 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
63053e7c | 2247 | cmd_ctx->session->kernel_session->trace_path); |
f3ed775e DG |
2248 | if (ret < 0) { |
2249 | ret = LTTCOMM_KERN_META_FAIL; | |
2250 | goto error; | |
2251 | } | |
2252 | } | |
8c0faa1d | 2253 | |
f3ed775e DG |
2254 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
2255 | DBG("Opening kernel metadata stream"); | |
2256 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
2257 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
2258 | if (ret < 0) { | |
2259 | ERR("Kernel create metadata stream failed"); | |
2260 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2261 | goto error; | |
2262 | } | |
2263 | } | |
2264 | } | |
8c0faa1d | 2265 | |
f3ed775e | 2266 | /* For each channel */ |
0d0c377a DG |
2267 | cds_list_for_each_entry(chan, |
2268 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
2269 | if (chan->stream_count == 0) { |
2270 | ret = kernel_open_channel_stream(chan); | |
2271 | if (ret < 0) { | |
2272 | ERR("Kernel create channel stream failed"); | |
2273 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2274 | goto error; | |
2275 | } | |
2276 | /* Update the stream global counter */ | |
2277 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
2278 | } | |
2279 | } | |
2280 | ||
283046e0 | 2281 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
8c0faa1d | 2282 | if (ret < 0) { |
f3ed775e | 2283 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2284 | goto error; |
2285 | } | |
8c0faa1d | 2286 | |
283046e0 DG |
2287 | DBG("Start kernel tracing"); |
2288 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
f3ed775e | 2289 | if (ret < 0) { |
283046e0 | 2290 | ERR("Kernel start session failed"); |
f3ed775e | 2291 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2292 | goto error; |
2293 | } | |
8c0faa1d | 2294 | |
f3ed775e DG |
2295 | /* Quiescent wait after starting trace */ |
2296 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2297 | } |
2298 | ||
f3ed775e | 2299 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
2300 | |
2301 | ret = LTTCOMM_OK; | |
2302 | break; | |
2303 | } | |
f3ed775e | 2304 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2305 | { |
f3ed775e | 2306 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
2307 | /* Setup lttng message with no payload */ |
2308 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2309 | if (ret < 0) { | |
2310 | goto setup_error; | |
2311 | } | |
2312 | ||
f3ed775e DG |
2313 | /* Kernel tracer */ |
2314 | if (cmd_ctx->session->kernel_session != NULL) { | |
2315 | DBG("Stop kernel tracing"); | |
84291629 | 2316 | |
f3ed775e DG |
2317 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
2318 | if (ret < 0) { | |
2319 | ERR("Kernel metadata flush failed"); | |
2320 | } | |
8c0faa1d | 2321 | |
f3ed775e DG |
2322 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
2323 | ret = kernel_flush_buffer(chan); | |
2324 | if (ret < 0) { | |
2325 | ERR("Kernel flush buffer error"); | |
2326 | } | |
2327 | } | |
2328 | ||
2329 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
2330 | if (ret < 0) { | |
2331 | ERR("Kernel stop session failed"); | |
2332 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2333 | goto error; | |
2334 | } | |
2335 | ||
2336 | /* Quiescent wait after stopping trace */ | |
2337 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2338 | } |
2339 | ||
f3ed775e | 2340 | /* TODO : User-space tracer */ |
8c0faa1d DG |
2341 | |
2342 | ret = LTTCOMM_OK; | |
2343 | break; | |
2344 | } | |
5e16da05 MD |
2345 | case LTTNG_CREATE_SESSION: |
2346 | { | |
5461b305 DG |
2347 | /* Setup lttng message with no payload */ |
2348 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2349 | if (ret < 0) { | |
2350 | goto setup_error; | |
2351 | } | |
2352 | ||
42abccdb | 2353 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
5e16da05 | 2354 | if (ret < 0) { |
f3ed775e | 2355 | if (ret == -EEXIST) { |
5e16da05 MD |
2356 | ret = LTTCOMM_EXIST_SESS; |
2357 | } else { | |
aaf97519 | 2358 | ret = LTTCOMM_FATAL; |
aaf97519 | 2359 | } |
5461b305 | 2360 | goto error; |
8028d920 | 2361 | } |
1657e9bb | 2362 | |
5461b305 | 2363 | ret = LTTCOMM_OK; |
5e16da05 MD |
2364 | break; |
2365 | } | |
2366 | case LTTNG_DESTROY_SESSION: | |
2367 | { | |
5461b305 DG |
2368 | /* Setup lttng message with no payload */ |
2369 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2370 | if (ret < 0) { | |
2371 | goto setup_error; | |
2372 | } | |
2373 | ||
f3ed775e DG |
2374 | /* Clean kernel session teardown */ |
2375 | teardown_kernel_session(cmd_ctx->session); | |
2376 | ||
42abccdb | 2377 | ret = destroy_session(cmd_ctx->lsm->session.name); |
5e16da05 | 2378 | if (ret < 0) { |
f3ed775e | 2379 | ret = LTTCOMM_FATAL; |
5461b305 | 2380 | goto error; |
5e16da05 | 2381 | } |
1657e9bb | 2382 | |
7a485870 DG |
2383 | /* |
2384 | * Must notify the kernel thread here to update it's pollfd in order to | |
2385 | * remove the channel(s)' fd just destroyed. | |
2386 | */ | |
2387 | ret = notify_kernel_pollfd(); | |
2388 | if (ret < 0) { | |
2389 | ret = LTTCOMM_FATAL; | |
2390 | goto error; | |
2391 | } | |
2392 | ||
5461b305 DG |
2393 | ret = LTTCOMM_OK; |
2394 | break; | |
5e16da05 | 2395 | } |
9f19cc17 | 2396 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2397 | { |
4b222185 | 2398 | size_t nb_dom = 0; |
5461b305 | 2399 | |
9f19cc17 DG |
2400 | if (cmd_ctx->session->kernel_session != NULL) { |
2401 | nb_dom++; | |
ce3d728c | 2402 | } |
520ff687 | 2403 | |
0177d773 | 2404 | nb_dom += cmd_ctx->session->ust_session_list.count; |
9f19cc17 DG |
2405 | |
2406 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2407 | if (ret < 0) { |
2408 | goto setup_error; | |
520ff687 | 2409 | } |
57167058 | 2410 | |
9f19cc17 DG |
2411 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2412 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2413 | |
9f19cc17 | 2414 | /* TODO: User-space tracer domain support */ |
5461b305 | 2415 | ret = LTTCOMM_OK; |
5e16da05 MD |
2416 | break; |
2417 | } | |
9f19cc17 | 2418 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2419 | { |
9f19cc17 DG |
2420 | /* |
2421 | * TODO: Only kernel channels are listed here. UST listing | |
2422 | * is needed on lttng-ust 2.0 release. | |
2423 | */ | |
2424 | size_t nb_chan = 0; | |
2425 | if (cmd_ctx->session->kernel_session != NULL) { | |
2426 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2427 | } |
ca95a216 | 2428 | |
9f19cc17 DG |
2429 | ret = setup_lttng_msg(cmd_ctx, |
2430 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2431 | if (ret < 0) { |
2432 | goto setup_error; | |
2433 | } | |
9f19cc17 DG |
2434 | |
2435 | list_lttng_channels(cmd_ctx->session, | |
2436 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2437 | ||
2438 | ret = LTTCOMM_OK; | |
5461b305 | 2439 | break; |
5e16da05 | 2440 | } |
9f19cc17 | 2441 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2442 | { |
9f19cc17 DG |
2443 | /* |
2444 | * TODO: Only kernel events are listed here. UST listing | |
2445 | * is needed on lttng-ust 2.0 release. | |
2446 | */ | |
2447 | size_t nb_event = 0; | |
2448 | struct ltt_kernel_channel *kchan = NULL; | |
2449 | ||
2450 | if (cmd_ctx->session->kernel_session != NULL) { | |
62499ad6 | 2451 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.list.channel_name, |
9f19cc17 DG |
2452 | cmd_ctx->session->kernel_session); |
2453 | if (kchan == NULL) { | |
2454 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2455 | goto error; | |
2456 | } | |
2457 | nb_event += kchan->event_count; | |
5461b305 | 2458 | } |
ca95a216 | 2459 | |
9f19cc17 DG |
2460 | ret = setup_lttng_msg(cmd_ctx, |
2461 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2462 | if (ret < 0) { |
2463 | goto setup_error; | |
2464 | } | |
9f19cc17 | 2465 | |
ced2f820 | 2466 | DBG("Listing events (%zu events)", nb_event); |
9f19cc17 DG |
2467 | |
2468 | list_lttng_events(kchan, | |
2469 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2470 | ||
2471 | ret = LTTCOMM_OK; | |
5461b305 | 2472 | break; |
5e16da05 MD |
2473 | } |
2474 | case LTTNG_LIST_SESSIONS: | |
2475 | { | |
6c9cc2ab | 2476 | lock_session_list(); |
5461b305 | 2477 | |
6c9cc2ab | 2478 | if (session_list_ptr->count == 0) { |
f3ed775e | 2479 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2480 | unlock_session_list(); |
5461b305 | 2481 | goto error; |
57167058 | 2482 | } |
5e16da05 | 2483 | |
6c9cc2ab DG |
2484 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2485 | session_list_ptr->count); | |
5461b305 | 2486 | if (ret < 0) { |
36a83748 | 2487 | unlock_session_list(); |
5461b305 | 2488 | goto setup_error; |
e065084a | 2489 | } |
5e16da05 | 2490 | |
6c9cc2ab DG |
2491 | /* Filled the session array */ |
2492 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2493 | ||
2494 | unlock_session_list(); | |
5e16da05 | 2495 | |
5461b305 | 2496 | ret = LTTCOMM_OK; |
5e16da05 MD |
2497 | break; |
2498 | } | |
d0254c7c MD |
2499 | case LTTNG_CALIBRATE: |
2500 | { | |
2501 | /* Setup lttng message with no payload */ | |
2502 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2503 | if (ret < 0) { | |
2504 | goto setup_error; | |
2505 | } | |
2506 | ||
2507 | switch (cmd_ctx->lsm->domain.type) { | |
2508 | case LTTNG_DOMAIN_KERNEL: | |
2509 | { | |
2510 | struct lttng_kernel_calibrate kcalibrate; | |
2511 | ||
2512 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2513 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2514 | if (ret < 0) { | |
2515 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2516 | goto error; | |
2517 | } | |
2518 | break; | |
2519 | } | |
2520 | default: | |
2521 | /* TODO: Userspace tracing */ | |
2522 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2523 | goto error; | |
2524 | } | |
2525 | ret = LTTCOMM_OK; | |
2526 | break; | |
2527 | } | |
d9800920 DG |
2528 | case LTTNG_REGISTER_CONSUMER: |
2529 | { | |
2530 | int sock; | |
2531 | ||
2532 | /* Setup lttng message with no payload */ | |
2533 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2534 | if (ret < 0) { | |
2535 | goto setup_error; | |
2536 | } | |
2537 | ||
2538 | switch (cmd_ctx->lsm->domain.type) { | |
2539 | case LTTNG_DOMAIN_KERNEL: | |
2540 | { | |
2541 | /* Can't register a consumer if there is already one */ | |
2542 | if (cmd_ctx->session->kernel_session->consumer_fd != 0) { | |
2543 | ret = LTTCOMM_CONNECT_FAIL; | |
2544 | goto error; | |
2545 | } | |
2546 | ||
2547 | sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path); | |
2548 | if (sock < 0) { | |
2549 | ret = LTTCOMM_CONNECT_FAIL; | |
2550 | goto error; | |
2551 | } | |
2552 | ||
2553 | cmd_ctx->session->kernel_session->consumer_fd = sock; | |
2554 | break; | |
2555 | } | |
2556 | default: | |
2557 | /* TODO: Userspace tracing */ | |
2558 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2559 | goto error; | |
2560 | } | |
2561 | ||
2562 | ret = LTTCOMM_OK; | |
2563 | break; | |
2564 | } | |
d0254c7c | 2565 | |
5e16da05 MD |
2566 | default: |
2567 | /* Undefined command */ | |
5461b305 DG |
2568 | ret = setup_lttng_msg(cmd_ctx, 0); |
2569 | if (ret < 0) { | |
2570 | goto setup_error; | |
2571 | } | |
2572 | ||
5e16da05 | 2573 | ret = LTTCOMM_UND; |
5461b305 | 2574 | break; |
fac6795d DG |
2575 | } |
2576 | ||
5461b305 DG |
2577 | /* Set return code */ |
2578 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2579 | |
b5541356 DG |
2580 | if (cmd_ctx->session) { |
2581 | unlock_session(cmd_ctx->session); | |
2582 | } | |
2583 | ||
e065084a DG |
2584 | return ret; |
2585 | ||
5461b305 | 2586 | error: |
5461b305 DG |
2587 | if (cmd_ctx->llm == NULL) { |
2588 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2589 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2590 | goto setup_error; |
2591 | } | |
2592 | } | |
e065084a | 2593 | /* Notify client of error */ |
5461b305 | 2594 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2595 | |
5461b305 | 2596 | setup_error: |
b5541356 DG |
2597 | if (cmd_ctx->session) { |
2598 | unlock_session(cmd_ctx->session); | |
2599 | } | |
8028d920 | 2600 | return ret; |
fac6795d DG |
2601 | } |
2602 | ||
1d4b027a | 2603 | /* |
d063d709 DG |
2604 | * This thread manage all clients request using the unix client socket for |
2605 | * communication. | |
1d4b027a DG |
2606 | */ |
2607 | static void *thread_manage_clients(void *data) | |
2608 | { | |
273ea72c DG |
2609 | int sock = 0, ret; |
2610 | struct command_ctx *cmd_ctx = NULL; | |
2611 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2612 | |
2613 | DBG("[thread] Manage client started"); | |
2614 | ||
2615 | ret = lttcomm_listen_unix_sock(client_sock); | |
2616 | if (ret < 0) { | |
2617 | goto error; | |
2618 | } | |
2619 | ||
273ea72c DG |
2620 | /* First fd is always the quit pipe */ |
2621 | pollfd[0].fd = thread_quit_pipe[0]; | |
2622 | ||
2623 | /* Apps socket */ | |
2624 | pollfd[1].fd = client_sock; | |
2625 | pollfd[1].events = POLLIN; | |
2626 | ||
1d4b027a DG |
2627 | /* Notify parent pid that we are ready |
2628 | * to accept command for client side. | |
2629 | */ | |
2630 | if (opt_sig_parent) { | |
2631 | kill(ppid, SIGCHLD); | |
2632 | } | |
2633 | ||
2634 | while (1) { | |
1d4b027a | 2635 | DBG("Accepting client command ..."); |
273ea72c DG |
2636 | |
2637 | /* Inifinite blocking call, waiting for transmission */ | |
2638 | ret = poll(pollfd, 2, -1); | |
2639 | if (ret < 0) { | |
2640 | perror("poll client thread"); | |
2641 | goto error; | |
2642 | } | |
2643 | ||
2644 | /* Thread quit pipe has been closed. Killing thread. */ | |
2645 | if (pollfd[0].revents == POLLNVAL) { | |
2646 | goto error; | |
2647 | } else if (pollfd[1].revents == POLLERR) { | |
2648 | ERR("Client socket poll error"); | |
2649 | goto error; | |
2650 | } | |
2651 | ||
1d4b027a DG |
2652 | sock = lttcomm_accept_unix_sock(client_sock); |
2653 | if (sock < 0) { | |
2654 | goto error; | |
2655 | } | |
2656 | ||
2657 | /* Allocate context command to process the client request */ | |
2658 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2659 | ||
2660 | /* Allocate data buffer for reception */ | |
2661 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2662 | cmd_ctx->llm = NULL; | |
2663 | cmd_ctx->session = NULL; | |
2664 | ||
2665 | /* | |
2666 | * Data is received from the lttng client. The struct | |
2667 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2668 | * the client. | |
2669 | */ | |
2670 | DBG("Receiving data from client ..."); | |
2671 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2672 | if (ret <= 0) { | |
2673 | continue; | |
2674 | } | |
2675 | ||
f7776ea7 DG |
2676 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2677 | ||
1d4b027a DG |
2678 | /* |
2679 | * This function dispatch the work to the kernel or userspace tracer | |
2680 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2681 | * informations for the client. The command context struct contains | |
2682 | * everything this function may needs. | |
2683 | */ | |
2684 | ret = process_client_msg(cmd_ctx); | |
2685 | if (ret < 0) { | |
2686 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2687 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2688 | /* Error detected but still accept command */ | |
a2fb29a5 | 2689 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2690 | continue; |
2691 | } | |
2692 | ||
2693 | DBG("Sending response (size: %d, retcode: %d)", | |
2694 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2695 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2696 | if (ret < 0) { | |
2697 | ERR("Failed to send data back to client"); | |
2698 | } | |
2699 | ||
a2fb29a5 | 2700 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2701 | |
2702 | /* End of transmission */ | |
2703 | close(sock); | |
1d4b027a DG |
2704 | } |
2705 | ||
2706 | error: | |
273ea72c DG |
2707 | DBG("Client thread dying"); |
2708 | if (client_sock) { | |
2709 | close(client_sock); | |
2710 | } | |
2711 | if (sock) { | |
2712 | close(sock); | |
2713 | } | |
2714 | ||
2715 | unlink(client_unix_sock_path); | |
2716 | ||
a2fb29a5 | 2717 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2718 | return NULL; |
2719 | } | |
2720 | ||
2721 | ||
fac6795d DG |
2722 | /* |
2723 | * usage function on stderr | |
2724 | */ | |
2725 | static void usage(void) | |
2726 | { | |
b716ce68 | 2727 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2728 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2729 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2730 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2731 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2732 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2733 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2734 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2735 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2736 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2737 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2738 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2739 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2740 | } |
2741 | ||
2742 | /* | |
2743 | * daemon argument parsing | |
2744 | */ | |
2745 | static int parse_args(int argc, char **argv) | |
2746 | { | |
2747 | int c; | |
2748 | ||
2749 | static struct option long_options[] = { | |
2750 | { "client-sock", 1, 0, 'c' }, | |
2751 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2752 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2753 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2754 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2755 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2756 | { "help", 0, 0, 'h' }, |
2757 | { "group", 1, 0, 'g' }, | |
2758 | { "version", 0, 0, 'V' }, | |
75462a81 | 2759 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2760 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2761 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2762 | { NULL, 0, 0, 0 } |
2763 | }; | |
2764 | ||
2765 | while (1) { | |
2766 | int option_index = 0; | |
31f73cc9 | 2767 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2768 | if (c == -1) { |
2769 | break; | |
2770 | } | |
2771 | ||
2772 | switch (c) { | |
2773 | case 0: | |
2774 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2775 | if (optarg) { | |
2776 | fprintf(stderr, " with arg %s\n", optarg); | |
2777 | } | |
2778 | break; | |
b716ce68 | 2779 | case 'c': |
fac6795d DG |
2780 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2781 | break; | |
2782 | case 'a': | |
2783 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2784 | break; | |
2785 | case 'd': | |
2786 | opt_daemon = 1; | |
2787 | break; | |
2788 | case 'g': | |
2789 | opt_tracing_group = strdup(optarg); | |
2790 | break; | |
2791 | case 'h': | |
2792 | usage(); | |
2793 | exit(EXIT_FAILURE); | |
2794 | case 'V': | |
2795 | fprintf(stdout, "%s\n", VERSION); | |
2796 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2797 | case 'S': |
2798 | opt_sig_parent = 1; | |
2799 | break; | |
d6f42150 DG |
2800 | case 'E': |
2801 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2802 | break; | |
2803 | case 'C': | |
2804 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2805 | break; | |
75462a81 DG |
2806 | case 'q': |
2807 | opt_quiet = 1; | |
2808 | break; | |
3f9947db | 2809 | case 'v': |
53086306 DG |
2810 | /* Verbose level can increase using multiple -v */ |
2811 | opt_verbose += 1; | |
3f9947db | 2812 | break; |
31f73cc9 MD |
2813 | case 'Z': |
2814 | opt_verbose_kconsumerd += 1; | |
2815 | break; | |
fac6795d DG |
2816 | default: |
2817 | /* Unknown option or other error. | |
2818 | * Error is printed by getopt, just return */ | |
2819 | return -1; | |
2820 | } | |
2821 | } | |
2822 | ||
2823 | return 0; | |
2824 | } | |
2825 | ||
2826 | /* | |
d063d709 | 2827 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2828 | * apps_sock - The communication socket for all UST apps. |
2829 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2830 | */ |
cf3af59e | 2831 | static int init_daemon_socket(void) |
fac6795d DG |
2832 | { |
2833 | int ret = 0; | |
2834 | mode_t old_umask; | |
2835 | ||
2836 | old_umask = umask(0); | |
2837 | ||
2838 | /* Create client tool unix socket */ | |
d6f42150 DG |
2839 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2840 | if (client_sock < 0) { | |
2841 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2842 | ret = -1; |
2843 | goto end; | |
2844 | } | |
2845 | ||
2846 | /* File permission MUST be 660 */ | |
2847 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2848 | if (ret < 0) { | |
d6f42150 | 2849 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2850 | perror("chmod"); |
2851 | goto end; | |
2852 | } | |
2853 | ||
2854 | /* Create the application unix socket */ | |
d6f42150 DG |
2855 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2856 | if (apps_sock < 0) { | |
2857 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2858 | ret = -1; |
2859 | goto end; | |
2860 | } | |
2861 | ||
d6f42150 | 2862 | /* File permission MUST be 666 */ |
fac6795d DG |
2863 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2864 | if (ret < 0) { | |
d6f42150 | 2865 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2866 | perror("chmod"); |
2867 | goto end; | |
2868 | } | |
2869 | ||
2870 | end: | |
2871 | umask(old_umask); | |
2872 | return ret; | |
2873 | } | |
2874 | ||
2875 | /* | |
7d8234d9 MD |
2876 | * Check if the global socket is available, and if a daemon is answering |
2877 | * at the other side. If yes, error is returned. | |
fac6795d | 2878 | */ |
cf3af59e | 2879 | static int check_existing_daemon(void) |
fac6795d | 2880 | { |
7d8234d9 | 2881 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 2882 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 2883 | return 0; |
099e26bd | 2884 | } |
7d8234d9 | 2885 | /* Is there anybody out there ? */ |
099e26bd | 2886 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 2887 | return -EEXIST; |
099e26bd | 2888 | } else { |
7d8234d9 | 2889 | return 0; |
099e26bd | 2890 | } |
fac6795d DG |
2891 | } |
2892 | ||
fac6795d | 2893 | /* |
d063d709 | 2894 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2895 | * |
d063d709 DG |
2896 | * Race window between mkdir and chown is OK because we are going from more |
2897 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2898 | */ |
d6f42150 | 2899 | static int set_permissions(void) |
fac6795d DG |
2900 | { |
2901 | int ret; | |
996b65c8 | 2902 | gid_t gid; |
fac6795d | 2903 | |
996b65c8 MD |
2904 | gid = allowed_group(); |
2905 | if (gid < 0) { | |
a463f419 DG |
2906 | if (is_root) { |
2907 | WARN("No tracing group detected"); | |
2908 | ret = 0; | |
2909 | } else { | |
2910 | ERR("Missing tracing group. Aborting execution."); | |
2911 | ret = -1; | |
2912 | } | |
fac6795d DG |
2913 | goto end; |
2914 | } | |
2915 | ||
d6f42150 | 2916 | /* Set lttng run dir */ |
996b65c8 | 2917 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
2918 | if (ret < 0) { |
2919 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2920 | perror("chown"); | |
2921 | } | |
2922 | ||
2923 | /* lttng client socket path */ | |
996b65c8 | 2924 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 2925 | if (ret < 0) { |
d6f42150 DG |
2926 | ERR("Unable to set group on %s", client_unix_sock_path); |
2927 | perror("chown"); | |
2928 | } | |
2929 | ||
2930 | /* kconsumerd error socket path */ | |
996b65c8 | 2931 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
2932 | if (ret < 0) { |
2933 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2934 | perror("chown"); |
2935 | } | |
2936 | ||
d6f42150 | 2937 | DBG("All permissions are set"); |
e07ae692 | 2938 | |
fac6795d DG |
2939 | end: |
2940 | return ret; | |
2941 | } | |
2942 | ||
7a485870 | 2943 | /* |
d063d709 | 2944 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2945 | */ |
2946 | static int create_kernel_poll_pipe(void) | |
2947 | { | |
2948 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2949 | } | |
2950 | ||
099e26bd DG |
2951 | /* |
2952 | * Create the application command pipe to wake thread_manage_apps. | |
2953 | */ | |
2954 | static int create_apps_cmd_pipe(void) | |
2955 | { | |
2956 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
2957 | } | |
2958 | ||
d6f42150 | 2959 | /* |
d063d709 | 2960 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2961 | */ |
2962 | static int create_lttng_rundir(void) | |
2963 | { | |
2964 | int ret; | |
2965 | ||
2966 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2967 | if (ret < 0) { | |
b1f11e69 DG |
2968 | if (errno != EEXIST) { |
2969 | ERR("Unable to create " LTTNG_RUNDIR); | |
2970 | goto error; | |
2971 | } else { | |
2972 | ret = 0; | |
2973 | } | |
d6f42150 DG |
2974 | } |
2975 | ||
2976 | error: | |
2977 | return ret; | |
2978 | } | |
2979 | ||
2980 | /* | |
d063d709 DG |
2981 | * Setup sockets and directory needed by the kconsumerd communication with the |
2982 | * session daemon. | |
d6f42150 DG |
2983 | */ |
2984 | static int set_kconsumerd_sockets(void) | |
2985 | { | |
2986 | int ret; | |
2987 | ||
2988 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2989 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2990 | } | |
2991 | ||
2992 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2993 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2994 | } | |
2995 | ||
2996 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2997 | if (ret < 0) { | |
6beb2242 DG |
2998 | if (errno != EEXIST) { |
2999 | ERR("Failed to create " KCONSUMERD_PATH); | |
3000 | goto error; | |
3001 | } | |
3002 | ret = 0; | |
d6f42150 DG |
3003 | } |
3004 | ||
3005 | /* Create the kconsumerd error unix socket */ | |
3006 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
3007 | if (kconsumerd_err_sock < 0) { | |
3008 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
3009 | ret = -1; | |
3010 | goto error; | |
3011 | } | |
3012 | ||
3013 | /* File permission MUST be 660 */ | |
3014 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3015 | if (ret < 0) { | |
3016 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3017 | perror("chmod"); | |
3018 | goto error; | |
3019 | } | |
3020 | ||
3021 | error: | |
3022 | return ret; | |
3023 | } | |
3024 | ||
fac6795d | 3025 | /* |
d063d709 | 3026 | * Signal handler for the daemon |
cf3af59e MD |
3027 | * |
3028 | * Simply stop all worker threads, leaving main() return gracefully | |
3029 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
3030 | */ |
3031 | static void sighandler(int sig) | |
3032 | { | |
3033 | switch (sig) { | |
cf3af59e MD |
3034 | case SIGPIPE: |
3035 | DBG("SIGPIPE catched"); | |
3036 | return; | |
3037 | case SIGINT: | |
3038 | DBG("SIGINT catched"); | |
3039 | stop_threads(); | |
3040 | break; | |
3041 | case SIGTERM: | |
3042 | DBG("SIGTERM catched"); | |
3043 | stop_threads(); | |
3044 | break; | |
3045 | default: | |
3046 | break; | |
fac6795d | 3047 | } |
fac6795d DG |
3048 | } |
3049 | ||
3050 | /* | |
d063d709 | 3051 | * Setup signal handler for : |
1d4b027a | 3052 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3053 | */ |
1d4b027a | 3054 | static int set_signal_handler(void) |
fac6795d | 3055 | { |
1d4b027a DG |
3056 | int ret = 0; |
3057 | struct sigaction sa; | |
3058 | sigset_t sigset; | |
fac6795d | 3059 | |
1d4b027a DG |
3060 | if ((ret = sigemptyset(&sigset)) < 0) { |
3061 | perror("sigemptyset"); | |
3062 | return ret; | |
3063 | } | |
d6f42150 | 3064 | |
1d4b027a DG |
3065 | sa.sa_handler = sighandler; |
3066 | sa.sa_mask = sigset; | |
3067 | sa.sa_flags = 0; | |
3068 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3069 | perror("sigaction"); | |
3070 | return ret; | |
d6f42150 DG |
3071 | } |
3072 | ||
1d4b027a DG |
3073 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3074 | perror("sigaction"); | |
3075 | return ret; | |
d6f42150 | 3076 | } |
aaf26714 | 3077 | |
1d4b027a DG |
3078 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3079 | perror("sigaction"); | |
3080 | return ret; | |
8c0faa1d DG |
3081 | } |
3082 | ||
1d4b027a DG |
3083 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3084 | ||
3085 | return ret; | |
fac6795d DG |
3086 | } |
3087 | ||
f3ed775e | 3088 | /* |
d063d709 DG |
3089 | * Set open files limit to unlimited. This daemon can open a large number of |
3090 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3091 | */ |
3092 | static void set_ulimit(void) | |
3093 | { | |
3094 | int ret; | |
3095 | struct rlimit lim; | |
3096 | ||
a88df331 | 3097 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3098 | lim.rlim_cur = 65535; |
3099 | lim.rlim_max = 65535; | |
3100 | ||
3101 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3102 | if (ret < 0) { | |
3103 | perror("failed to set open files limit"); | |
3104 | } | |
3105 | } | |
3106 | ||
fac6795d DG |
3107 | /* |
3108 | * main | |
3109 | */ | |
3110 | int main(int argc, char **argv) | |
3111 | { | |
fac6795d DG |
3112 | int ret = 0; |
3113 | void *status; | |
b082db07 | 3114 | const char *home_path; |
fac6795d | 3115 | |
273ea72c | 3116 | /* Create thread quit pipe */ |
cf3af59e MD |
3117 | if ((ret = init_thread_quit_pipe()) < 0) { |
3118 | goto error; | |
273ea72c DG |
3119 | } |
3120 | ||
fac6795d DG |
3121 | /* Parse arguments */ |
3122 | progname = argv[0]; | |
3123 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3124 | goto error; |
fac6795d DG |
3125 | } |
3126 | ||
3127 | /* Daemonize */ | |
3128 | if (opt_daemon) { | |
53094c05 DG |
3129 | ret = daemon(0, 0); |
3130 | if (ret < 0) { | |
3131 | perror("daemon"); | |
cf3af59e | 3132 | goto error; |
53094c05 | 3133 | } |
fac6795d DG |
3134 | } |
3135 | ||
3136 | /* Check if daemon is UID = 0 */ | |
3137 | is_root = !getuid(); | |
3138 | ||
fac6795d | 3139 | if (is_root) { |
d6f42150 DG |
3140 | ret = create_lttng_rundir(); |
3141 | if (ret < 0) { | |
cf3af59e | 3142 | goto error; |
d6f42150 DG |
3143 | } |
3144 | ||
fac6795d | 3145 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3146 | snprintf(apps_unix_sock_path, PATH_MAX, |
3147 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3148 | } |
3149 | ||
3150 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3151 | snprintf(client_unix_sock_path, PATH_MAX, |
3152 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3153 | } | |
0fdd1e2c DG |
3154 | |
3155 | /* Set global SHM for ust */ | |
3156 | if (strlen(wait_shm_path) == 0) { | |
3157 | snprintf(wait_shm_path, PATH_MAX, | |
3158 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3159 | } | |
fac6795d | 3160 | } else { |
b082db07 DG |
3161 | home_path = get_home_dir(); |
3162 | if (home_path == NULL) { | |
273ea72c DG |
3163 | /* TODO: Add --socket PATH option */ |
3164 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3165 | ret = -EPERM; |
3166 | goto error; | |
b082db07 DG |
3167 | } |
3168 | ||
fac6795d | 3169 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3170 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3171 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3172 | } |
3173 | ||
3174 | /* Set the cli tool unix socket path */ | |
3175 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3176 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3177 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3178 | } |
0fdd1e2c DG |
3179 | |
3180 | /* Set global SHM for ust */ | |
3181 | if (strlen(wait_shm_path) == 0) { | |
3182 | snprintf(wait_shm_path, PATH_MAX, | |
3183 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3184 | } | |
fac6795d DG |
3185 | } |
3186 | ||
847177cd DG |
3187 | DBG("Client socket path %s", client_unix_sock_path); |
3188 | DBG("Application socket path %s", apps_unix_sock_path); | |
3189 | ||
273ea72c | 3190 | /* |
7d8234d9 | 3191 | * See if daemon already exist. |
fac6795d | 3192 | */ |
7d8234d9 | 3193 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3194 | ERR("Already running daemon.\n"); |
273ea72c | 3195 | /* |
cf3af59e MD |
3196 | * We do not goto exit because we must not cleanup() |
3197 | * because a daemon is already running. | |
ab118b20 | 3198 | */ |
cf3af59e | 3199 | goto error; |
a88df331 DG |
3200 | } |
3201 | ||
3202 | /* After this point, we can safely call cleanup() so goto error is used */ | |
3203 | ||
3204 | /* | |
3205 | * These actions must be executed as root. We do that *after* setting up | |
3206 | * the sockets path because we MUST make the check for another daemon using | |
3207 | * those paths *before* trying to set the kernel consumer sockets and init | |
3208 | * kernel tracer. | |
3209 | */ | |
3210 | if (is_root) { | |
3211 | ret = set_kconsumerd_sockets(); | |
3212 | if (ret < 0) { | |
cf3af59e | 3213 | goto exit; |
a88df331 DG |
3214 | } |
3215 | ||
3216 | /* Setup kernel tracer */ | |
3217 | init_kernel_tracer(); | |
3218 | ||
3219 | /* Set ulimit for open files */ | |
3220 | set_ulimit(); | |
fac6795d DG |
3221 | } |
3222 | ||
cf3af59e MD |
3223 | if ((ret = set_signal_handler()) < 0) { |
3224 | goto exit; | |
fac6795d DG |
3225 | } |
3226 | ||
d6f42150 | 3227 | /* Setup the needed unix socket */ |
cf3af59e MD |
3228 | if ((ret = init_daemon_socket()) < 0) { |
3229 | goto exit; | |
fac6795d DG |
3230 | } |
3231 | ||
3232 | /* Set credentials to socket */ | |
cf3af59e MD |
3233 | if (is_root && ((ret = set_permissions()) < 0)) { |
3234 | goto exit; | |
fac6795d DG |
3235 | } |
3236 | ||
5b8719f5 DG |
3237 | /* Get parent pid if -S, --sig-parent is specified. */ |
3238 | if (opt_sig_parent) { | |
3239 | ppid = getppid(); | |
3240 | } | |
3241 | ||
7a485870 | 3242 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3243 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3244 | goto exit; | |
7a485870 DG |
3245 | } |
3246 | ||
099e26bd DG |
3247 | /* Setup the thread apps communication pipe. */ |
3248 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3249 | goto exit; | |
3250 | } | |
3251 | ||
3252 | /* Init UST command queue. */ | |
3253 | cds_wfq_init(&ust_cmd_queue.queue); | |
3254 | ||
273ea72c DG |
3255 | /* |
3256 | * Get session list pointer. This pointer MUST NOT be free(). | |
3257 | * This list is statically declared in session.c | |
3258 | */ | |
b5541356 DG |
3259 | session_list_ptr = get_session_list(); |
3260 | ||
cf3af59e | 3261 | /* Create thread to manage the client socket */ |
099e26bd DG |
3262 | ret = pthread_create(&client_thread, NULL, |
3263 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3264 | if (ret != 0) { |
099e26bd | 3265 | perror("pthread_create clients"); |
cf3af59e MD |
3266 | goto exit_client; |
3267 | } | |
fac6795d | 3268 | |
099e26bd DG |
3269 | /* Create thread to dispatch registration */ |
3270 | ret = pthread_create(&dispatch_thread, NULL, | |
3271 | thread_dispatch_ust_registration, (void *) NULL); | |
3272 | if (ret != 0) { | |
3273 | perror("pthread_create dispatch"); | |
3274 | goto exit_dispatch; | |
3275 | } | |
3276 | ||
3277 | /* Create thread to manage application registration. */ | |
3278 | ret = pthread_create(®_apps_thread, NULL, | |
3279 | thread_registration_apps, (void *) NULL); | |
3280 | if (ret != 0) { | |
3281 | perror("pthread_create registration"); | |
3282 | goto exit_reg_apps; | |
3283 | } | |
3284 | ||
cf3af59e MD |
3285 | /* Create thread to manage application socket */ |
3286 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
3287 | if (ret != 0) { | |
099e26bd | 3288 | perror("pthread_create apps"); |
cf3af59e MD |
3289 | goto exit_apps; |
3290 | } | |
fac6795d | 3291 | |
cf3af59e MD |
3292 | /* Create kernel thread to manage kernel event */ |
3293 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
3294 | if (ret != 0) { | |
099e26bd | 3295 | perror("pthread_create kernel"); |
cf3af59e MD |
3296 | goto exit_kernel; |
3297 | } | |
7a485870 | 3298 | |
cf3af59e MD |
3299 | ret = pthread_join(kernel_thread, &status); |
3300 | if (ret != 0) { | |
3301 | perror("pthread_join"); | |
3302 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3303 | } |
3304 | ||
cf3af59e MD |
3305 | exit_kernel: |
3306 | ret = pthread_join(apps_thread, &status); | |
3307 | if (ret != 0) { | |
3308 | perror("pthread_join"); | |
3309 | goto error; /* join error, exit without cleanup */ | |
3310 | } | |
fac6795d | 3311 | |
cf3af59e | 3312 | exit_apps: |
099e26bd DG |
3313 | ret = pthread_join(reg_apps_thread, &status); |
3314 | if (ret != 0) { | |
3315 | perror("pthread_join"); | |
3316 | goto error; /* join error, exit without cleanup */ | |
3317 | } | |
3318 | ||
3319 | exit_reg_apps: | |
3320 | ret = pthread_join(dispatch_thread, &status); | |
3321 | if (ret != 0) { | |
3322 | perror("pthread_join"); | |
3323 | goto error; /* join error, exit without cleanup */ | |
3324 | } | |
3325 | ||
3326 | exit_dispatch: | |
cf3af59e MD |
3327 | ret = pthread_join(client_thread, &status); |
3328 | if (ret != 0) { | |
3329 | perror("pthread_join"); | |
3330 | goto error; /* join error, exit without cleanup */ | |
3331 | } | |
3332 | ||
3333 | ret = join_kconsumerd_thread(); | |
3334 | if (ret != 0) { | |
3335 | perror("join_kconsumerd"); | |
3336 | goto error; /* join error, exit without cleanup */ | |
3337 | } | |
a88df331 | 3338 | |
cf3af59e | 3339 | exit_client: |
a88df331 | 3340 | exit: |
cf3af59e MD |
3341 | /* |
3342 | * cleanup() is called when no other thread is running. | |
3343 | */ | |
3344 | cleanup(); | |
3345 | if (!ret) | |
3346 | exit(EXIT_SUCCESS); | |
3347 | error: | |
5e16da05 | 3348 | exit(EXIT_FAILURE); |
fac6795d | 3349 | } |