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]; | |
85611738 DG |
570 | kernel_pollfd[nb_fd - 1].events = |
571 | POLLHUP | POLLNVAL | POLLERR | POLLIN | POLLRDHUP | POLLPRI; | |
7a485870 DG |
572 | |
573 | return nb_fd; | |
574 | ||
575 | error: | |
6c9cc2ab | 576 | unlock_session_list(); |
7a485870 DG |
577 | return -1; |
578 | } | |
579 | ||
580 | /* | |
d063d709 DG |
581 | * Find the channel fd from 'fd' over all tracing session. When found, check |
582 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 583 | * |
d063d709 | 584 | * Useful for CPU hotplug feature. |
7a485870 DG |
585 | */ |
586 | static int update_kernel_stream(int fd) | |
587 | { | |
588 | int ret = 0; | |
589 | struct ltt_session *session; | |
590 | struct ltt_kernel_channel *channel; | |
591 | ||
592 | DBG("Updating kernel streams for channel fd %d", fd); | |
593 | ||
6c9cc2ab | 594 | lock_session_list(); |
b5541356 DG |
595 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
596 | lock_session(session); | |
7a485870 | 597 | if (session->kernel_session == NULL) { |
b5541356 | 598 | unlock_session(session); |
7a485870 DG |
599 | continue; |
600 | } | |
d9800920 DG |
601 | |
602 | /* This is not suppose to be 0 but this is an extra security check */ | |
603 | if (session->kernel_session->consumer_fd == 0) { | |
604 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
605 | } | |
606 | ||
7a485870 DG |
607 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
608 | if (channel->fd == fd) { | |
609 | DBG("Channel found, updating kernel streams"); | |
610 | ret = kernel_open_channel_stream(channel); | |
611 | if (ret < 0) { | |
b3c750d2 | 612 | goto error; |
7a485870 | 613 | } |
d9800920 | 614 | |
7a485870 DG |
615 | /* |
616 | * Have we already sent fds to the consumer? If yes, it means that | |
617 | * tracing is started so it is safe to send our updated stream fds. | |
618 | */ | |
619 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
d9800920 DG |
620 | ret = send_kconsumerd_channel_fds(session->kernel_session->consumer_fd, |
621 | channel); | |
7a485870 | 622 | if (ret < 0) { |
b3c750d2 | 623 | goto error; |
7a485870 DG |
624 | } |
625 | } | |
b3c750d2 | 626 | goto error; |
7a485870 DG |
627 | } |
628 | } | |
b5541356 | 629 | unlock_session(session); |
7a485870 | 630 | } |
b3c750d2 MD |
631 | unlock_session_list(); |
632 | return ret; | |
7a485870 | 633 | |
b3c750d2 MD |
634 | error: |
635 | unlock_session(session); | |
6c9cc2ab | 636 | unlock_session_list(); |
7a485870 DG |
637 | return ret; |
638 | } | |
639 | ||
640 | /* | |
d063d709 | 641 | * This thread manage event coming from the kernel. |
7a485870 | 642 | * |
d063d709 DG |
643 | * Features supported in this thread: |
644 | * -) CPU Hotplug | |
7a485870 DG |
645 | */ |
646 | static void *thread_manage_kernel(void *data) | |
647 | { | |
648 | int ret, i, nb_fd = 0; | |
649 | char tmp; | |
650 | int update_poll_flag = 1; | |
651 | ||
652 | DBG("Thread manage kernel started"); | |
653 | ||
654 | while (1) { | |
655 | if (update_poll_flag == 1) { | |
656 | nb_fd = update_kernel_pollfd(); | |
657 | if (nb_fd < 0) { | |
658 | goto error; | |
659 | } | |
660 | update_poll_flag = 0; | |
661 | } | |
662 | ||
663 | DBG("Polling on %d fds", nb_fd); | |
664 | ||
665 | /* Poll infinite value of time */ | |
666 | ret = poll(kernel_pollfd, nb_fd, -1); | |
667 | if (ret < 0) { | |
668 | perror("poll kernel thread"); | |
669 | goto error; | |
670 | } else if (ret == 0) { | |
671 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
672 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
673 | "This should not have happened! Continuing..."); | |
7a485870 DG |
674 | continue; |
675 | } | |
676 | ||
273ea72c DG |
677 | /* Thread quit pipe has been closed. Killing thread. */ |
678 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
679 | goto error; | |
680 | } | |
681 | ||
7a485870 DG |
682 | DBG("Kernel poll event triggered"); |
683 | ||
684 | /* | |
685 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
686 | * must be updated. | |
687 | */ | |
273ea72c | 688 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 689 | case POLLIN: |
7a485870 DG |
690 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
691 | update_poll_flag = 1; | |
692 | continue; | |
b5541356 DG |
693 | case POLLERR: |
694 | goto error; | |
695 | default: | |
696 | break; | |
7a485870 DG |
697 | } |
698 | ||
699 | for (i = 0; i < nb_fd; i++) { | |
700 | switch (kernel_pollfd[i].revents) { | |
701 | /* | |
702 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
703 | * session and updating the kernel consumer | |
704 | */ | |
705 | case POLLIN | POLLRDNORM: | |
706 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
707 | if (ret < 0) { | |
708 | continue; | |
709 | } | |
710 | break; | |
711 | } | |
712 | } | |
713 | } | |
714 | ||
715 | error: | |
716 | DBG("Kernel thread dying"); | |
717 | if (kernel_pollfd) { | |
718 | free(kernel_pollfd); | |
719 | } | |
273ea72c DG |
720 | |
721 | close(kernel_poll_pipe[0]); | |
722 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
723 | return NULL; |
724 | } | |
725 | ||
1d4b027a | 726 | /* |
d063d709 | 727 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
728 | */ |
729 | static void *thread_manage_kconsumerd(void *data) | |
730 | { | |
273ea72c | 731 | int sock = 0, ret; |
1d4b027a | 732 | enum lttcomm_return_code code; |
273ea72c | 733 | struct pollfd pollfd[2]; |
1d4b027a DG |
734 | |
735 | DBG("[thread] Manage kconsumerd started"); | |
736 | ||
737 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
738 | if (ret < 0) { | |
739 | goto error; | |
740 | } | |
741 | ||
273ea72c DG |
742 | /* First fd is always the quit pipe */ |
743 | pollfd[0].fd = thread_quit_pipe[0]; | |
744 | ||
745 | /* Apps socket */ | |
746 | pollfd[1].fd = kconsumerd_err_sock; | |
747 | pollfd[1].events = POLLIN; | |
748 | ||
749 | /* Inifinite blocking call, waiting for transmission */ | |
750 | ret = poll(pollfd, 2, -1); | |
751 | if (ret < 0) { | |
752 | perror("poll kconsumerd thread"); | |
753 | goto error; | |
754 | } | |
755 | ||
756 | /* Thread quit pipe has been closed. Killing thread. */ | |
757 | if (pollfd[0].revents == POLLNVAL) { | |
758 | goto error; | |
759 | } else if (pollfd[1].revents == POLLERR) { | |
760 | ERR("Kconsumerd err socket poll error"); | |
761 | goto error; | |
762 | } | |
763 | ||
1d4b027a DG |
764 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
765 | if (sock < 0) { | |
766 | goto error; | |
767 | } | |
768 | ||
712ea556 | 769 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
770 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
771 | if (ret <= 0) { | |
772 | goto error; | |
773 | } | |
774 | ||
775 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
776 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
777 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 778 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
779 | perror("kconsumerd connect"); |
780 | goto error; | |
781 | } | |
782 | /* Signal condition to tell that the kconsumerd is ready */ | |
783 | sem_post(&kconsumerd_sem); | |
784 | DBG("Kconsumerd command socket ready"); | |
785 | } else { | |
6f61d021 | 786 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
787 | lttcomm_get_readable_code(-code)); |
788 | goto error; | |
789 | } | |
790 | ||
72079cae DG |
791 | /* Kconsumerd err socket */ |
792 | pollfd[1].fd = sock; | |
793 | pollfd[1].events = POLLIN; | |
794 | ||
795 | /* Inifinite blocking call, waiting for transmission */ | |
796 | ret = poll(pollfd, 2, -1); | |
797 | if (ret < 0) { | |
798 | perror("poll kconsumerd thread"); | |
799 | goto error; | |
800 | } | |
801 | ||
802 | /* Thread quit pipe has been closed. Killing thread. */ | |
803 | if (pollfd[0].revents == POLLNVAL) { | |
804 | goto error; | |
805 | } else if (pollfd[1].revents == POLLERR) { | |
806 | ERR("Kconsumerd err socket second poll error"); | |
807 | goto error; | |
808 | } | |
809 | ||
712ea556 DG |
810 | /* Wait for any kconsumerd error */ |
811 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
812 | if (ret <= 0) { | |
813 | ERR("Kconsumerd closed the command socket"); | |
814 | goto error; | |
6f61d021 | 815 | } |
1d4b027a | 816 | |
712ea556 DG |
817 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
818 | ||
1d4b027a | 819 | error: |
6f61d021 | 820 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
821 | if (kconsumerd_err_sock) { |
822 | close(kconsumerd_err_sock); | |
823 | } | |
824 | if (kconsumerd_cmd_sock) { | |
825 | close(kconsumerd_cmd_sock); | |
826 | } | |
827 | if (sock) { | |
828 | close(sock); | |
829 | } | |
830 | ||
831 | unlink(kconsumerd_err_unix_sock_path); | |
832 | unlink(kconsumerd_cmd_unix_sock_path); | |
833 | ||
834 | kconsumerd_pid = 0; | |
1d4b027a DG |
835 | return NULL; |
836 | } | |
837 | ||
838 | /* | |
099e26bd DG |
839 | * Reallocate the apps command pollfd structure of nb_fd size. |
840 | * | |
841 | * The first two fds must be there at all time. | |
842 | */ | |
0177d773 DG |
843 | static int update_apps_cmd_pollfd(unsigned int nb_fd, unsigned int old_nb_fd, |
844 | struct pollfd **pollfd) | |
099e26bd | 845 | { |
0177d773 DG |
846 | int i, count; |
847 | struct pollfd *old_pollfd = NULL; | |
848 | ||
099e26bd DG |
849 | /* Can't accept pollfd less than 2 */ |
850 | if (nb_fd < 2) { | |
851 | goto end; | |
852 | } | |
853 | ||
0177d773 DG |
854 | if (*pollfd) { |
855 | /* Save pointer */ | |
856 | old_pollfd = *pollfd; | |
857 | } | |
858 | ||
859 | *pollfd = malloc(nb_fd * sizeof(struct pollfd)); | |
099e26bd | 860 | if (*pollfd == NULL) { |
0177d773 | 861 | perror("malloc manage apps pollfd"); |
099e26bd DG |
862 | goto error; |
863 | } | |
864 | ||
865 | /* First fd is always the quit pipe */ | |
866 | (*pollfd)[0].fd = thread_quit_pipe[0]; | |
85611738 DG |
867 | (*pollfd)[0].events = |
868 | POLLHUP | POLLNVAL | POLLERR | POLLIN | POLLRDHUP | POLLPRI; | |
869 | ||
099e26bd DG |
870 | /* Apps command pipe */ |
871 | (*pollfd)[1].fd = apps_cmd_pipe[0]; | |
872 | (*pollfd)[1].events = POLLIN; | |
873 | ||
0177d773 DG |
874 | /* Start count after the two pipes below */ |
875 | count = 2; | |
876 | for (i = 2; i < old_nb_fd; i++) { | |
877 | /* Add to new pollfd */ | |
878 | if (old_pollfd[i].fd != -1) { | |
879 | (*pollfd)[count].fd = old_pollfd[i].fd; | |
880 | (*pollfd)[count].events = POLLHUP | POLLNVAL | POLLERR; | |
881 | count++; | |
882 | } | |
883 | ||
884 | if (count > nb_fd) { | |
885 | ERR("Updating poll fd wrong size"); | |
886 | goto error; | |
887 | } | |
888 | } | |
889 | ||
733bb3da DG |
890 | if (nb_fd < 2) { |
891 | /* | |
892 | * There should *always* be at least two fds in the pollfd. This safety | |
893 | * check make sure the poll() will actually try on those two pipes at | |
894 | * best which are the thread_quit_pipe and apps_cmd_pipe. | |
895 | */ | |
896 | nb_fd = 2; | |
85611738 | 897 | MSG("nb_fd < 2 --> Not good! Continuing..."); |
733bb3da DG |
898 | } |
899 | ||
0177d773 DG |
900 | /* Destroy old pollfd */ |
901 | free(old_pollfd); | |
902 | ||
099e26bd DG |
903 | DBG("Apps cmd pollfd realloc of size %d", nb_fd); |
904 | ||
905 | end: | |
906 | return 0; | |
907 | ||
908 | error: | |
0177d773 DG |
909 | /* Destroy old pollfd */ |
910 | free(old_pollfd); | |
099e26bd DG |
911 | return -1; |
912 | } | |
913 | ||
099e26bd DG |
914 | /* |
915 | * This thread manage application communication. | |
1d4b027a DG |
916 | */ |
917 | static void *thread_manage_apps(void *data) | |
099e26bd | 918 | { |
28ba3f4e | 919 | int i, ret, current_nb_fd; |
099e26bd DG |
920 | unsigned int nb_fd = 2; |
921 | int update_poll_flag = 1; | |
922 | struct pollfd *pollfd = NULL; | |
923 | struct ust_command ust_cmd; | |
924 | ||
925 | DBG("[thread] Manage application started"); | |
926 | ||
927 | ust_cmd.sock = -1; | |
28ba3f4e | 928 | current_nb_fd = nb_fd; |
099e26bd DG |
929 | |
930 | while (1) { | |
931 | /* See if we have a valid socket to add to pollfd */ | |
932 | if (ust_cmd.sock != -1) { | |
933 | nb_fd++; | |
934 | update_poll_flag = 1; | |
935 | } | |
936 | ||
937 | /* The pollfd struct must be updated */ | |
938 | if (update_poll_flag) { | |
28ba3f4e | 939 | ret = update_apps_cmd_pollfd(nb_fd, current_nb_fd, &pollfd); |
099e26bd DG |
940 | if (ret < 0) { |
941 | /* malloc failed so we quit */ | |
942 | goto error; | |
943 | } | |
0177d773 | 944 | |
099e26bd DG |
945 | if (ust_cmd.sock != -1) { |
946 | /* Update pollfd with the new UST socket */ | |
947 | DBG("Adding sock %d to apps cmd pollfd", ust_cmd.sock); | |
948 | pollfd[nb_fd - 1].fd = ust_cmd.sock; | |
0177d773 | 949 | pollfd[nb_fd - 1].events = POLLHUP | POLLNVAL | POLLERR; |
099e26bd DG |
950 | ust_cmd.sock = -1; |
951 | } | |
952 | } | |
953 | ||
954 | DBG("Apps thread polling on %d fds", nb_fd); | |
955 | ||
956 | /* Inifinite blocking call, waiting for transmission */ | |
957 | ret = poll(pollfd, nb_fd, -1); | |
958 | if (ret < 0) { | |
959 | perror("poll apps thread"); | |
960 | goto error; | |
961 | } | |
962 | ||
963 | /* Thread quit pipe has been closed. Killing thread. */ | |
964 | if (pollfd[0].revents == POLLNVAL) { | |
965 | goto error; | |
0177d773 DG |
966 | } else { |
967 | /* apps_cmd_pipe pipe events */ | |
968 | switch (pollfd[1].revents) { | |
969 | case POLLERR: | |
970 | ERR("Apps command pipe poll error"); | |
099e26bd | 971 | goto error; |
0177d773 DG |
972 | case POLLIN: |
973 | /* Empty pipe */ | |
974 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
975 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
976 | perror("read apps cmd pipe"); | |
977 | goto error; | |
978 | } | |
099e26bd | 979 | |
0177d773 DG |
980 | /* Register applicaton to the session daemon */ |
981 | ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock); | |
982 | if (ret < 0) { | |
983 | /* Only critical ENOMEM error can be returned here */ | |
984 | goto error; | |
985 | } | |
099e26bd | 986 | |
0177d773 DG |
987 | ret = ustctl_register_done(ust_cmd.sock); |
988 | if (ret < 0) { | |
989 | /* | |
990 | * If the registration is not possible, we simply unregister | |
991 | * the apps and continue | |
992 | */ | |
993 | unregister_traceable_app(ust_cmd.sock); | |
994 | } | |
995 | break; | |
099e26bd DG |
996 | } |
997 | } | |
998 | ||
28ba3f4e DG |
999 | current_nb_fd = nb_fd; |
1000 | for (i = 2; i < current_nb_fd; i++) { | |
099e26bd DG |
1001 | /* Apps socket is closed/hungup */ |
1002 | switch (pollfd[i].revents) { | |
0177d773 | 1003 | case POLLERR: |
099e26bd | 1004 | case POLLHUP: |
0177d773 | 1005 | case POLLNVAL: |
099e26bd DG |
1006 | /* Pipe closed */ |
1007 | unregister_traceable_app(pollfd[i].fd); | |
0177d773 DG |
1008 | /* Indicate to remove this fd from the pollfd */ |
1009 | pollfd[i].fd = -1; | |
099e26bd | 1010 | nb_fd--; |
0177d773 | 1011 | break; |
099e26bd DG |
1012 | } |
1013 | } | |
1014 | ||
28ba3f4e | 1015 | if (nb_fd != current_nb_fd) { |
099e26bd DG |
1016 | update_poll_flag = 1; |
1017 | } | |
1018 | } | |
1019 | ||
1020 | error: | |
1021 | DBG("Application communication apps dying"); | |
1022 | close(apps_cmd_pipe[0]); | |
1023 | close(apps_cmd_pipe[1]); | |
1024 | ||
1025 | free(pollfd); | |
1026 | ||
1027 | return NULL; | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Dispatch request from the registration threads to the application | |
1032 | * communication thread. | |
1033 | */ | |
1034 | static void *thread_dispatch_ust_registration(void *data) | |
1035 | { | |
1036 | int ret; | |
1037 | struct cds_wfq_node *node; | |
1038 | struct ust_command *ust_cmd = NULL; | |
1039 | ||
1040 | DBG("[thread] Dispatch UST command started"); | |
1041 | ||
1042 | while (!dispatch_thread_exit) { | |
1043 | /* Atomically prepare the queue futex */ | |
1044 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1045 | ||
1046 | do { | |
1047 | /* Dequeue command for registration */ | |
1048 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1049 | if (node == NULL) { | |
1050 | DBG("Waked up but nothing in the UST command queue"); | |
1051 | /* Continue thread execution */ | |
1052 | break; | |
1053 | } | |
1054 | ||
1055 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1056 | ||
2f50c8a3 DG |
1057 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1058 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1059 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1060 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1061 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1062 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1063 | /* |
1064 | * Inform apps thread of the new application registration. This | |
1065 | * call is blocking so we can be assured that the data will be read | |
1066 | * at some point in time or wait to the end of the world :) | |
1067 | */ | |
1068 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1069 | sizeof(struct ust_command)); | |
1070 | if (ret < 0) { | |
1071 | perror("write apps cmd pipe"); | |
1072 | if (errno == EBADF) { | |
1073 | /* | |
1074 | * We can't inform the application thread to process | |
1075 | * registration. We will exit or else application | |
1076 | * registration will not occur and tracing will never | |
1077 | * start. | |
1078 | */ | |
1079 | goto error; | |
1080 | } | |
1081 | } | |
1082 | free(ust_cmd); | |
1083 | } while (node != NULL); | |
1084 | ||
1085 | /* Futex wait on queue. Blocking call on futex() */ | |
1086 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1087 | } | |
1088 | ||
1089 | error: | |
1090 | DBG("Dispatch thread dying"); | |
1091 | return NULL; | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * This thread manage application registration. | |
1096 | */ | |
1097 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1098 | { |
273ea72c DG |
1099 | int sock = 0, ret; |
1100 | struct pollfd pollfd[2]; | |
099e26bd DG |
1101 | /* |
1102 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1103 | * freed in the manage apps thread. | |
1104 | */ | |
1105 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1106 | |
099e26bd | 1107 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1108 | |
1109 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1110 | if (ret < 0) { | |
1111 | goto error; | |
1112 | } | |
1113 | ||
273ea72c DG |
1114 | /* First fd is always the quit pipe */ |
1115 | pollfd[0].fd = thread_quit_pipe[0]; | |
85611738 DG |
1116 | pollfd[0].events = |
1117 | POLLHUP | POLLNVAL | POLLERR | POLLIN | POLLRDHUP | POLLPRI; | |
273ea72c DG |
1118 | |
1119 | /* Apps socket */ | |
1120 | pollfd[1].fd = apps_sock; | |
1121 | pollfd[1].events = POLLIN; | |
1122 | ||
1d4b027a | 1123 | /* Notify all applications to register */ |
0fdd1e2c DG |
1124 | ret = notify_ust_apps(1); |
1125 | if (ret < 0) { | |
1126 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
1127 | "Execution continues but there might be problem for already running\n" | |
1128 | "applications that wishes to register."); | |
1129 | } | |
1d4b027a DG |
1130 | |
1131 | while (1) { | |
1132 | DBG("Accepting application registration"); | |
273ea72c DG |
1133 | |
1134 | /* Inifinite blocking call, waiting for transmission */ | |
1135 | ret = poll(pollfd, 2, -1); | |
1136 | if (ret < 0) { | |
099e26bd | 1137 | perror("poll register apps thread"); |
273ea72c DG |
1138 | goto error; |
1139 | } | |
1140 | ||
1141 | /* Thread quit pipe has been closed. Killing thread. */ | |
1142 | if (pollfd[0].revents == POLLNVAL) { | |
1143 | goto error; | |
273ea72c DG |
1144 | } |
1145 | ||
90014c57 DG |
1146 | switch (pollfd[1].revents) { |
1147 | case POLLNVAL: | |
1148 | case POLLHUP: | |
1149 | case POLLRDHUP: | |
1150 | case POLLERR: | |
1151 | ERR("Register apps socket poll error"); | |
1d4b027a | 1152 | goto error; |
90014c57 DG |
1153 | case POLLIN: |
1154 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1155 | if (sock < 0) { | |
1156 | goto error; | |
1157 | } | |
1d4b027a | 1158 | |
90014c57 DG |
1159 | /* Create UST registration command for enqueuing */ |
1160 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1161 | if (ust_cmd == NULL) { | |
1162 | perror("ust command malloc"); | |
1163 | goto error; | |
1164 | } | |
099e26bd | 1165 | |
90014c57 DG |
1166 | /* |
1167 | * Using message-based transmissions to ensure we don't have to deal | |
1168 | * with partially received messages. | |
1169 | */ | |
1170 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1171 | sizeof(struct ust_register_msg)); | |
1172 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1173 | if (ret < 0) { | |
1174 | perror("lttcomm_recv_unix_sock register apps"); | |
1175 | } else { | |
1176 | ERR("Wrong size received on apps register"); | |
1177 | } | |
1178 | free(ust_cmd); | |
1179 | close(sock); | |
1180 | continue; | |
2f50c8a3 | 1181 | } |
1d4b027a | 1182 | |
90014c57 | 1183 | ust_cmd->sock = sock; |
099e26bd | 1184 | |
90014c57 DG |
1185 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1186 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1187 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1188 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1189 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1190 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
1191 | /* | |
1192 | * Lock free enqueue the registration request. | |
1193 | * The red pill has been taken! This apps will be part of the *system* | |
1194 | */ | |
1195 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
099e26bd | 1196 | |
90014c57 DG |
1197 | /* |
1198 | * Wake the registration queue futex. | |
1199 | * Implicit memory barrier with the exchange in cds_wfq_enqueue. | |
1200 | */ | |
1201 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1202 | break; | |
1203 | } | |
1d4b027a DG |
1204 | } |
1205 | ||
1206 | error: | |
0fdd1e2c DG |
1207 | DBG("UST Registration thread dying"); |
1208 | ||
1209 | /* Notify that the registration thread is gone */ | |
1210 | notify_ust_apps(0); | |
1211 | ||
1212 | close(apps_sock); | |
1213 | close(sock); | |
1d4b027a | 1214 | |
273ea72c | 1215 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1216 | |
1d4b027a DG |
1217 | return NULL; |
1218 | } | |
1219 | ||
8c0faa1d | 1220 | /* |
d063d709 DG |
1221 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1222 | * exec or it will fails. | |
8c0faa1d | 1223 | */ |
693bd40b | 1224 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1225 | { |
1226 | int ret; | |
1227 | ||
1228 | /* Setup semaphore */ | |
1229 | sem_init(&kconsumerd_sem, 0, 0); | |
1230 | ||
1d4b027a | 1231 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
1232 | if (ret != 0) { |
1233 | perror("pthread_create kconsumerd"); | |
1234 | goto error; | |
1235 | } | |
1236 | ||
693bd40b | 1237 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1238 | sem_wait(&kconsumerd_sem); |
1239 | ||
712ea556 DG |
1240 | if (kconsumerd_pid == 0) { |
1241 | ERR("Kconsumerd did not start"); | |
1242 | goto error; | |
1243 | } | |
1244 | ||
8c0faa1d DG |
1245 | return 0; |
1246 | ||
1247 | error: | |
712ea556 | 1248 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1249 | return ret; |
1250 | } | |
1251 | ||
d9800920 DG |
1252 | /* |
1253 | * Join kernel consumer thread | |
1254 | */ | |
cf3af59e MD |
1255 | static int join_kconsumerd_thread(void) |
1256 | { | |
1257 | void *status; | |
1258 | int ret; | |
1259 | ||
1260 | if (kconsumerd_pid != 0) { | |
1261 | ret = kill(kconsumerd_pid, SIGTERM); | |
1262 | if (ret) { | |
1263 | ERR("Error killing kconsumerd"); | |
1264 | return ret; | |
1265 | } | |
1266 | return pthread_join(kconsumerd_thread, &status); | |
1267 | } else { | |
1268 | return 0; | |
1269 | } | |
1270 | } | |
1271 | ||
8c0faa1d | 1272 | /* |
d063d709 | 1273 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1274 | * |
d063d709 | 1275 | * Return pid if successful else -1. |
8c0faa1d | 1276 | */ |
693bd40b | 1277 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1278 | { |
1279 | int ret; | |
1280 | pid_t pid; | |
53086306 | 1281 | const char *verbosity; |
8c0faa1d | 1282 | |
c49dc785 DG |
1283 | DBG("Spawning kconsumerd"); |
1284 | ||
8c0faa1d DG |
1285 | pid = fork(); |
1286 | if (pid == 0) { | |
1287 | /* | |
1288 | * Exec kconsumerd. | |
1289 | */ | |
31f73cc9 | 1290 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1291 | verbosity = "--verbose"; |
1292 | } else { | |
1293 | verbosity = "--quiet"; | |
1294 | } | |
1295 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1296 | if (errno != 0) { |
1297 | perror("kernel start consumer exec"); | |
1298 | } | |
1299 | exit(EXIT_FAILURE); | |
1300 | } else if (pid > 0) { | |
1301 | ret = pid; | |
1302 | goto error; | |
1303 | } else { | |
1304 | perror("kernel start consumer fork"); | |
1305 | ret = -errno; | |
1306 | goto error; | |
1307 | } | |
1308 | ||
1309 | error: | |
1310 | return ret; | |
1311 | } | |
1312 | ||
693bd40b | 1313 | /* |
d063d709 | 1314 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1315 | */ |
1316 | static int start_kconsumerd(void) | |
1317 | { | |
1318 | int ret; | |
1319 | ||
693bd40b | 1320 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1321 | if (kconsumerd_pid != 0) { |
817153bb | 1322 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1323 | goto end; |
1324 | } | |
693bd40b | 1325 | |
c49dc785 DG |
1326 | ret = spawn_kconsumerd(); |
1327 | if (ret < 0) { | |
1328 | ERR("Spawning kconsumerd failed"); | |
1329 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1330 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1331 | goto error; | |
693bd40b | 1332 | } |
c49dc785 DG |
1333 | |
1334 | /* Setting up the global kconsumerd_pid */ | |
1335 | kconsumerd_pid = ret; | |
693bd40b DG |
1336 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1337 | ||
6f61d021 DG |
1338 | DBG("Kconsumerd pid %d", ret); |
1339 | ||
693bd40b | 1340 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1341 | ret = spawn_kconsumerd_thread(); |
1342 | if (ret < 0) { | |
1343 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1344 | goto error; |
1345 | } | |
1346 | ||
c49dc785 | 1347 | end: |
693bd40b DG |
1348 | return 0; |
1349 | ||
1350 | error: | |
1351 | return ret; | |
1352 | } | |
1353 | ||
b73401da | 1354 | /* |
d063d709 | 1355 | * modprobe_kernel_modules |
b73401da DG |
1356 | */ |
1357 | static int modprobe_kernel_modules(void) | |
1358 | { | |
ab147185 | 1359 | int ret = 0, i; |
b73401da DG |
1360 | char modprobe[256]; |
1361 | ||
ab147185 MD |
1362 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1363 | ret = snprintf(modprobe, sizeof(modprobe), | |
1364 | "/sbin/modprobe %s%s", | |
1365 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1366 | kernel_modules_list[i].name); | |
b73401da DG |
1367 | if (ret < 0) { |
1368 | perror("snprintf modprobe"); | |
1369 | goto error; | |
1370 | } | |
ab147185 | 1371 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1372 | ret = system(modprobe); |
ab147185 MD |
1373 | if (ret == -1) { |
1374 | ERR("Unable to launch modprobe for module %s", | |
1375 | kernel_modules_list[i].name); | |
1376 | } else if (kernel_modules_list[i].required | |
d9800920 | 1377 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1378 | ERR("Unable to load module %s", |
1379 | kernel_modules_list[i].name); | |
1380 | } else { | |
1381 | DBG("Modprobe successfully %s", | |
1382 | kernel_modules_list[i].name); | |
1383 | } | |
1384 | } | |
1385 | ||
1386 | error: | |
1387 | return ret; | |
1388 | } | |
1389 | ||
b73401da | 1390 | /* |
d063d709 | 1391 | * mount_debugfs |
b73401da DG |
1392 | */ |
1393 | static int mount_debugfs(char *path) | |
1394 | { | |
1395 | int ret; | |
1396 | char *type = "debugfs"; | |
1397 | ||
996b65c8 | 1398 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1399 | if (ret < 0) { |
1400 | goto error; | |
1401 | } | |
1402 | ||
1403 | ret = mount(type, path, type, 0, NULL); | |
1404 | if (ret < 0) { | |
1405 | perror("mount debugfs"); | |
1406 | goto error; | |
1407 | } | |
1408 | ||
1409 | DBG("Mounted debugfs successfully at %s", path); | |
1410 | ||
1411 | error: | |
1412 | return ret; | |
1413 | } | |
1414 | ||
8c0faa1d | 1415 | /* |
d063d709 | 1416 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1417 | */ |
f3ed775e | 1418 | static void init_kernel_tracer(void) |
8c0faa1d | 1419 | { |
b73401da DG |
1420 | int ret; |
1421 | char *proc_mounts = "/proc/mounts"; | |
1422 | char line[256]; | |
1423 | char *debugfs_path = NULL, *lttng_path; | |
1424 | FILE *fp; | |
1425 | ||
1426 | /* Detect debugfs */ | |
1427 | fp = fopen(proc_mounts, "r"); | |
1428 | if (fp == NULL) { | |
1429 | ERR("Unable to probe %s", proc_mounts); | |
1430 | goto error; | |
1431 | } | |
1432 | ||
1433 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1434 | if (strstr(line, "debugfs") != NULL) { | |
1435 | /* Remove first string */ | |
1436 | strtok(line, " "); | |
1437 | /* Dup string here so we can reuse line later on */ | |
1438 | debugfs_path = strdup(strtok(NULL, " ")); | |
1439 | DBG("Got debugfs path : %s", debugfs_path); | |
1440 | break; | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | fclose(fp); | |
1445 | ||
1446 | /* Mount debugfs if needded */ | |
1447 | if (debugfs_path == NULL) { | |
1448 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1449 | if (ret < 0) { | |
1450 | perror("asprintf debugfs path"); | |
1451 | goto error; | |
1452 | } | |
1453 | ret = mount_debugfs(debugfs_path); | |
1454 | if (ret < 0) { | |
1455 | goto error; | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | /* Modprobe lttng kernel modules */ | |
1460 | ret = modprobe_kernel_modules(); | |
1461 | if (ret < 0) { | |
1462 | goto error; | |
1463 | } | |
1464 | ||
1465 | /* Setup lttng kernel path */ | |
1466 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1467 | if (ret < 0) { | |
1468 | perror("asprintf lttng path"); | |
1469 | goto error; | |
1470 | } | |
1471 | ||
1472 | /* Open debugfs lttng */ | |
1473 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1474 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1475 | DBG("Failed to open %s", lttng_path); |
1476 | goto error; | |
8c0faa1d DG |
1477 | } |
1478 | ||
b73401da DG |
1479 | free(lttng_path); |
1480 | free(debugfs_path); | |
f3ed775e | 1481 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1482 | return; |
1483 | ||
1484 | error: | |
1485 | if (lttng_path) { | |
1486 | free(lttng_path); | |
1487 | } | |
1488 | if (debugfs_path) { | |
1489 | free(debugfs_path); | |
1490 | } | |
1491 | WARN("No kernel tracer available"); | |
1492 | kernel_tracer_fd = 0; | |
1493 | return; | |
f3ed775e | 1494 | } |
33a2b854 | 1495 | |
f3ed775e | 1496 | /* |
d063d709 DG |
1497 | * Start tracing by creating trace directory and sending FDs to the kernel |
1498 | * consumer. | |
f3ed775e DG |
1499 | */ |
1500 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1501 | { | |
f40799e8 | 1502 | int ret = 0; |
8c0faa1d | 1503 | |
f3ed775e | 1504 | if (session->kconsumer_fds_sent == 0) { |
d9800920 DG |
1505 | /* |
1506 | * Assign default kernel consumer if no consumer assigned to the kernel | |
1507 | * session. At this point, it's NOT suppose to be 0 but this is an extra | |
1508 | * security check. | |
1509 | */ | |
1510 | if (session->consumer_fd == 0) { | |
1511 | session->consumer_fd = kconsumerd_cmd_sock; | |
1512 | } | |
1513 | ||
1514 | ret = send_kconsumerd_fds(session); | |
f3ed775e DG |
1515 | if (ret < 0) { |
1516 | ERR("Send kconsumerd fds failed"); | |
1517 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1518 | goto error; | |
1519 | } | |
1d4b027a | 1520 | |
f3ed775e DG |
1521 | session->kconsumer_fds_sent = 1; |
1522 | } | |
1d4b027a DG |
1523 | |
1524 | error: | |
1525 | return ret; | |
8c0faa1d DG |
1526 | } |
1527 | ||
7a485870 DG |
1528 | /* |
1529 | * Notify kernel thread to update it's pollfd. | |
1530 | */ | |
1531 | static int notify_kernel_pollfd(void) | |
1532 | { | |
1533 | int ret; | |
1534 | ||
1535 | /* Inform kernel thread of the new kernel channel */ | |
1536 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1537 | if (ret < 0) { | |
1538 | perror("write kernel poll pipe"); | |
1539 | } | |
1540 | ||
1541 | return ret; | |
1542 | } | |
1543 | ||
8c0faa1d | 1544 | /* |
d063d709 | 1545 | * Allocate a channel structure and fill it. |
8c0faa1d | 1546 | */ |
b389abbe MD |
1547 | static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type, |
1548 | char *name) | |
8c0faa1d | 1549 | { |
f3ed775e | 1550 | struct lttng_channel *chan; |
1d4b027a | 1551 | |
f3ed775e DG |
1552 | chan = malloc(sizeof(struct lttng_channel)); |
1553 | if (chan == NULL) { | |
1554 | perror("init channel malloc"); | |
1555 | goto error; | |
8c0faa1d | 1556 | } |
1d4b027a | 1557 | |
ed8f384d | 1558 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1559 | perror("snprintf channel name"); |
b389abbe | 1560 | goto error; |
f3ed775e DG |
1561 | } |
1562 | ||
1563 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
f3ed775e DG |
1564 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
1565 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1d4b027a | 1566 | |
b389abbe MD |
1567 | switch (domain_type) { |
1568 | case LTTNG_DOMAIN_KERNEL: | |
1569 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
1570 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
1571 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1572 | break; | |
1573 | /* TODO: add UST */ | |
1574 | default: | |
1575 | goto error; /* Not implemented */ | |
1576 | } | |
1577 | ||
f3ed775e | 1578 | return chan; |
b389abbe MD |
1579 | |
1580 | error: | |
1581 | free(chan); | |
1582 | return NULL; | |
8c0faa1d DG |
1583 | } |
1584 | ||
0177d773 DG |
1585 | /* |
1586 | * Create an UST session and add it to the session ust list. | |
1587 | */ | |
1588 | static int create_ust_session(pid_t pid, struct ltt_session *session) | |
1589 | { | |
1590 | int ret = -1; | |
1591 | struct ltt_ust_session *lus; | |
1592 | ||
1593 | DBG("Creating UST session"); | |
1594 | ||
1595 | lus = trace_ust_create_session(session->path, pid); | |
1596 | if (lus == NULL) { | |
1597 | goto error; | |
1598 | } | |
1599 | ||
1600 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, | |
1601 | geteuid(), allowed_group()); | |
1602 | if (ret < 0) { | |
1603 | if (ret != -EEXIST) { | |
1604 | ERR("Trace directory creation error"); | |
1605 | goto error; | |
1606 | } | |
1607 | } | |
1608 | ||
1609 | /* Create session on the UST tracer */ | |
1610 | ret = ustctl_create_session(lus); | |
1611 | if (ret < 0) { | |
1612 | goto error; | |
1613 | } | |
1614 | ||
1615 | return 0; | |
1616 | ||
1617 | error: | |
1618 | free(lus); | |
1619 | return ret; | |
1620 | } | |
1621 | ||
333f285e | 1622 | /* |
d063d709 | 1623 | * Create a kernel tracer session then create the default channel. |
333f285e | 1624 | */ |
f3ed775e | 1625 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1626 | { |
f3ed775e | 1627 | int ret; |
f3ed775e DG |
1628 | |
1629 | DBG("Creating kernel session"); | |
1630 | ||
1631 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1632 | if (ret < 0) { | |
1633 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1634 | goto error; | |
333f285e DG |
1635 | } |
1636 | ||
d9800920 DG |
1637 | /* Set kernel consumer socket fd */ |
1638 | if (kconsumerd_cmd_sock) { | |
1639 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1640 | } | |
1641 | ||
63053e7c DG |
1642 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1643 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1644 | if (ret < 0) { |
996b65c8 | 1645 | if (ret != -EEXIST) { |
7a485870 DG |
1646 | ERR("Trace directory creation error"); |
1647 | goto error; | |
1648 | } | |
1649 | } | |
1650 | ||
f3ed775e DG |
1651 | error: |
1652 | return ret; | |
333f285e DG |
1653 | } |
1654 | ||
6c9cc2ab DG |
1655 | /* |
1656 | * Using the session list, filled a lttng_session array to send back to the | |
1657 | * client for session listing. | |
1658 | * | |
1659 | * The session list lock MUST be acquired before calling this function. Use | |
1660 | * lock_session_list() and unlock_session_list(). | |
1661 | */ | |
1662 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1663 | { | |
1664 | int i = 0; | |
1665 | struct ltt_session *session; | |
1666 | ||
1667 | DBG("Getting all available session"); | |
1668 | /* | |
1669 | * Iterate over session list and append data after the control struct in | |
1670 | * the buffer. | |
1671 | */ | |
1672 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1673 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1674 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1675 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1676 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1677 | i++; |
1678 | } | |
1679 | } | |
1680 | ||
9f19cc17 DG |
1681 | /* |
1682 | * Fill lttng_channel array of all channels. | |
1683 | */ | |
1684 | static void list_lttng_channels(struct ltt_session *session, | |
1685 | struct lttng_channel *channels) | |
1686 | { | |
1687 | int i = 0; | |
1688 | struct ltt_kernel_channel *kchan; | |
1689 | ||
1690 | DBG("Listing channels for session %s", session->name); | |
1691 | ||
1692 | /* Kernel channels */ | |
1693 | if (session->kernel_session != NULL) { | |
1694 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1695 | /* Copy lttng_channel struct to array */ | |
1696 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1697 | channels[i].enabled = kchan->enabled; | |
1698 | i++; | |
1699 | } | |
1700 | } | |
1701 | ||
1702 | /* TODO: Missing UST listing */ | |
1703 | } | |
1704 | ||
1705 | /* | |
1706 | * Fill lttng_event array of all events in the channel. | |
1707 | */ | |
1708 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1709 | struct lttng_event *events) | |
1710 | { | |
1711 | /* | |
1712 | * TODO: This is ONLY kernel. Need UST support. | |
1713 | */ | |
1714 | int i = 0; | |
1715 | struct ltt_kernel_event *event; | |
1716 | ||
1717 | DBG("Listing events for channel %s", kchan->channel->name); | |
1718 | ||
1719 | /* Kernel channels */ | |
1720 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1721 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1722 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1723 | events[i].enabled = event->enabled; |
1724 | switch (event->event->instrumentation) { | |
1725 | case LTTNG_KERNEL_TRACEPOINT: | |
1726 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1727 | break; | |
1728 | case LTTNG_KERNEL_KPROBE: | |
1729 | case LTTNG_KERNEL_KRETPROBE: | |
1730 | events[i].type = LTTNG_EVENT_PROBE; | |
1731 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1732 | sizeof(struct lttng_kernel_kprobe)); | |
1733 | break; | |
1734 | case LTTNG_KERNEL_FUNCTION: | |
1735 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1736 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1737 | sizeof(struct lttng_kernel_function)); | |
1738 | break; | |
1739 | } | |
1740 | i++; | |
1741 | } | |
1742 | } | |
1743 | ||
fac6795d | 1744 | /* |
d063d709 DG |
1745 | * Process the command requested by the lttng client within the command |
1746 | * context structure. This function make sure that the return structure (llm) | |
1747 | * is set and ready for transmission before returning. | |
fac6795d | 1748 | * |
e065084a | 1749 | * Return any error encountered or 0 for success. |
fac6795d | 1750 | */ |
5461b305 | 1751 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1752 | { |
f40799e8 | 1753 | int ret = LTTCOMM_OK; |
fac6795d | 1754 | |
5461b305 | 1755 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1756 | |
63053e7c DG |
1757 | /* |
1758 | * Commands that DO NOT need a session. | |
1759 | */ | |
5461b305 | 1760 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1761 | case LTTNG_CREATE_SESSION: |
1762 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1763 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1764 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1765 | break; |
1766 | default: | |
42abccdb DG |
1767 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1768 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1769 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1770 | /* If session name not found */ |
42abccdb | 1771 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1772 | ret = LTTCOMM_SESS_NOT_FOUND; |
1773 | } else { /* If no session name specified */ | |
1774 | ret = LTTCOMM_SELECT_SESS; | |
1775 | } | |
5461b305 | 1776 | goto error; |
b5541356 DG |
1777 | } else { |
1778 | /* Acquire lock for the session */ | |
1779 | lock_session(cmd_ctx->session); | |
379473d2 | 1780 | } |
5e16da05 | 1781 | break; |
379473d2 DG |
1782 | } |
1783 | ||
f3ed775e | 1784 | /* |
d0254c7c | 1785 | * Check domain type for specific "pre-action". |
f3ed775e | 1786 | */ |
0d0c377a DG |
1787 | switch (cmd_ctx->lsm->domain.type) { |
1788 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1789 | /* Kernel tracer check */ |
20fe2104 | 1790 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1791 | init_kernel_tracer(); |
1792 | if (kernel_tracer_fd == 0) { | |
1793 | ret = LTTCOMM_KERN_NA; | |
1794 | goto error; | |
1795 | } | |
20fe2104 | 1796 | } |
f3ed775e | 1797 | /* Need a session for kernel command */ |
d0254c7c | 1798 | switch (cmd_ctx->lsm->cmd_type) { |
d9800920 | 1799 | case LTTNG_CALIBRATE: |
d0254c7c MD |
1800 | case LTTNG_CREATE_SESSION: |
1801 | case LTTNG_LIST_SESSIONS: | |
1802 | case LTTNG_LIST_TRACEPOINTS: | |
d0254c7c MD |
1803 | break; |
1804 | default: | |
1805 | if (cmd_ctx->session->kernel_session == NULL) { | |
1806 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1807 | if (ret < 0) { |
d0254c7c | 1808 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1809 | goto error; |
1810 | } | |
d0254c7c | 1811 | /* Start the kernel consumer daemon */ |
d9800920 DG |
1812 | if (kconsumerd_pid == 0 && |
1813 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
d0254c7c MD |
1814 | ret = start_kconsumerd(); |
1815 | if (ret < 0) { | |
1816 | goto error; | |
1817 | } | |
1818 | } | |
f3ed775e DG |
1819 | } |
1820 | } | |
0d0c377a | 1821 | break; |
0fdd1e2c DG |
1822 | case LTTNG_DOMAIN_UST_PID: |
1823 | break; | |
0d0c377a DG |
1824 | default: |
1825 | break; | |
20fe2104 DG |
1826 | } |
1827 | ||
fac6795d | 1828 | /* Process by command type */ |
5461b305 | 1829 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1830 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1831 | { |
b579acd9 | 1832 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1833 | |
1834 | /* Setup lttng message with no payload */ | |
1835 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1836 | if (ret < 0) { | |
1837 | goto setup_error; | |
1838 | } | |
1839 | ||
b579acd9 DG |
1840 | switch (cmd_ctx->lsm->domain.type) { |
1841 | case LTTNG_DOMAIN_KERNEL: | |
1842 | /* Create Kernel context */ | |
1843 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1844 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1845 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1846 | strncpy(kctx.u.perf_counter.name, | |
1847 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1848 | LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1849 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
b579acd9 DG |
1850 | |
1851 | /* Add kernel context to kernel tracer. See context.c */ | |
1852 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1853 | cmd_ctx->lsm->u.context.event_name, | |
1854 | cmd_ctx->lsm->u.context.channel_name); | |
1855 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1856 | goto error; |
1857 | } | |
b579acd9 DG |
1858 | break; |
1859 | default: | |
1860 | /* TODO: Userspace tracing */ | |
1861 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1862 | goto error; |
d65106b1 DG |
1863 | } |
1864 | ||
1865 | ret = LTTCOMM_OK; | |
1866 | break; | |
1867 | } | |
0b97ec54 | 1868 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1869 | { |
0b97ec54 | 1870 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1871 | |
1872 | /* Setup lttng message with no payload */ | |
1873 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1874 | if (ret < 0) { | |
1875 | goto setup_error; | |
1876 | } | |
1877 | ||
0b97ec54 DG |
1878 | switch (cmd_ctx->lsm->domain.type) { |
1879 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1880 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
0b97ec54 DG |
1881 | cmd_ctx->session->kernel_session); |
1882 | if (kchan == NULL) { | |
1883 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1884 | goto error; |
0b97ec54 DG |
1885 | } else if (kchan->enabled == 1) { |
1886 | ret = kernel_disable_channel(kchan); | |
1887 | if (ret < 0) { | |
1888 | if (ret != EEXIST) { | |
1889 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1890 | } | |
1891 | goto error; | |
1892 | } | |
26cc6b4e | 1893 | } |
0b97ec54 DG |
1894 | kernel_wait_quiescent(kernel_tracer_fd); |
1895 | break; | |
1896 | default: | |
1897 | /* TODO: Userspace tracing */ | |
1898 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1899 | goto error; | |
26cc6b4e DG |
1900 | } |
1901 | ||
26cc6b4e DG |
1902 | ret = LTTCOMM_OK; |
1903 | break; | |
1904 | } | |
f5177a38 | 1905 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1906 | { |
f5177a38 DG |
1907 | struct ltt_kernel_channel *kchan; |
1908 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1909 | |
1910 | /* Setup lttng message with no payload */ | |
1911 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1912 | if (ret < 0) { | |
1913 | goto setup_error; | |
1914 | } | |
1915 | ||
f5177a38 DG |
1916 | switch (cmd_ctx->lsm->domain.type) { |
1917 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1918 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1919 | cmd_ctx->session->kernel_session); |
1920 | if (kchan == NULL) { | |
1921 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1922 | goto error; |
e953ef25 | 1923 | } |
f5177a38 | 1924 | |
62499ad6 | 1925 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); |
f5177a38 DG |
1926 | if (kevent != NULL) { |
1927 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1928 | kchan->channel->name); | |
1929 | ret = kernel_disable_event(kevent); | |
1930 | if (ret < 0) { | |
1931 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1932 | goto error; | |
1933 | } | |
1934 | } | |
1935 | ||
1936 | kernel_wait_quiescent(kernel_tracer_fd); | |
1937 | break; | |
1938 | default: | |
1939 | /* TODO: Userspace tracing */ | |
1940 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1941 | goto error; | |
e953ef25 DG |
1942 | } |
1943 | ||
19e70852 | 1944 | ret = LTTCOMM_OK; |
e953ef25 DG |
1945 | break; |
1946 | } | |
f5177a38 | 1947 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1948 | { |
f5177a38 DG |
1949 | struct ltt_kernel_channel *kchan; |
1950 | struct ltt_kernel_event *kevent; | |
950131af DG |
1951 | |
1952 | /* Setup lttng message with no payload */ | |
1953 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1954 | if (ret < 0) { | |
1955 | goto setup_error; | |
1956 | } | |
1957 | ||
f5177a38 DG |
1958 | switch (cmd_ctx->lsm->domain.type) { |
1959 | case LTTNG_DOMAIN_KERNEL: | |
1960 | DBG("Disabling all enabled kernel events"); | |
62499ad6 | 1961 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1962 | cmd_ctx->session->kernel_session); |
1963 | if (kchan == NULL) { | |
1964 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1965 | goto error; | |
1966 | } | |
950131af | 1967 | |
f5177a38 DG |
1968 | /* For each event in the kernel session */ |
1969 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1970 | DBG("Disabling kernel event %s for channel %s.", | |
1971 | kevent->event->name, kchan->channel->name); | |
1972 | ret = kernel_disable_event(kevent); | |
1973 | if (ret < 0) { | |
1974 | continue; | |
1975 | } | |
950131af | 1976 | } |
f5177a38 DG |
1977 | |
1978 | /* Quiescent wait after event disable */ | |
1979 | kernel_wait_quiescent(kernel_tracer_fd); | |
1980 | break; | |
1981 | default: | |
1982 | /* TODO: Userspace tracing */ | |
1983 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1984 | goto error; | |
950131af DG |
1985 | } |
1986 | ||
950131af DG |
1987 | ret = LTTCOMM_OK; |
1988 | break; | |
1989 | } | |
0d0c377a | 1990 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 1991 | { |
0d0c377a | 1992 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
1993 | |
1994 | /* Setup lttng message with no payload */ | |
1995 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1996 | if (ret < 0) { | |
1997 | goto setup_error; | |
1998 | } | |
1999 | ||
0d0c377a DG |
2000 | switch (cmd_ctx->lsm->domain.type) { |
2001 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2002 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, |
0d0c377a DG |
2003 | cmd_ctx->session->kernel_session); |
2004 | if (kchan == NULL) { | |
2005 | /* Channel not found, creating it */ | |
2006 | DBG("Creating kernel channel"); | |
7d29a247 | 2007 | |
0d0c377a | 2008 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c DG |
2009 | &cmd_ctx->lsm->u.channel.chan, |
2010 | cmd_ctx->session->kernel_session->trace_path); | |
0d0c377a DG |
2011 | if (ret < 0) { |
2012 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2013 | goto error; | |
2014 | } | |
7d29a247 | 2015 | |
0d0c377a DG |
2016 | /* Notify kernel thread that there is a new channel */ |
2017 | ret = notify_kernel_pollfd(); | |
2018 | if (ret < 0) { | |
2019 | ret = LTTCOMM_FATAL; | |
2020 | goto error; | |
2021 | } | |
2022 | } else if (kchan->enabled == 0) { | |
2023 | ret = kernel_enable_channel(kchan); | |
2024 | if (ret < 0) { | |
2025 | if (ret != EEXIST) { | |
2026 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
2027 | } | |
2028 | goto error; | |
d36b8583 | 2029 | } |
d36b8583 | 2030 | } |
0d0c377a DG |
2031 | |
2032 | kernel_wait_quiescent(kernel_tracer_fd); | |
2033 | break; | |
0177d773 | 2034 | case LTTNG_DOMAIN_UST_PID: |
0fdd1e2c | 2035 | |
0177d773 | 2036 | break; |
0d0c377a | 2037 | default: |
0d0c377a DG |
2038 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2039 | goto error; | |
d36b8583 DG |
2040 | } |
2041 | ||
d36b8583 DG |
2042 | ret = LTTCOMM_OK; |
2043 | break; | |
2044 | } | |
0d0c377a | 2045 | case LTTNG_ENABLE_EVENT: |
894be886 | 2046 | { |
7d29a247 DG |
2047 | char *channel_name; |
2048 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 2049 | struct ltt_kernel_event *kevent; |
7d29a247 | 2050 | struct lttng_channel *chan; |
f3ed775e | 2051 | |
894be886 DG |
2052 | /* Setup lttng message with no payload */ |
2053 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2054 | if (ret < 0) { | |
2055 | goto setup_error; | |
2056 | } | |
2057 | ||
7d29a247 DG |
2058 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2059 | ||
0d0c377a DG |
2060 | switch (cmd_ctx->lsm->domain.type) { |
2061 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2062 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2063 | cmd_ctx->session->kernel_session); |
2064 | if (kchan == NULL) { | |
2065 | DBG("Channel not found. Creating channel %s", channel_name); | |
2066 | ||
2067 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2068 | if (chan == NULL) { | |
2069 | ret = LTTCOMM_FATAL; | |
2070 | goto error; | |
2071 | } | |
2072 | ||
2073 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2074 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2075 | if (ret < 0) { | |
2076 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2077 | goto error; | |
2078 | } | |
62499ad6 | 2079 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2080 | cmd_ctx->session->kernel_session); |
2081 | if (kchan == NULL) { | |
b389abbe MD |
2082 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2083 | channel_name); | |
2084 | ret = LTTCOMM_FATAL; | |
2085 | goto error; | |
7d29a247 | 2086 | } |
b389abbe | 2087 | } |
7d29a247 | 2088 | |
62499ad6 | 2089 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
0d0c377a DG |
2090 | if (kevent == NULL) { |
2091 | DBG("Creating kernel event %s for channel %s.", | |
2092 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
2093 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
2094 | } else { | |
2095 | DBG("Enabling kernel event %s for channel %s.", | |
2096 | kevent->event->name, channel_name); | |
2097 | ret = kernel_enable_event(kevent); | |
2098 | if (ret == -EEXIST) { | |
2099 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
2100 | goto error; |
2101 | } | |
2102 | } | |
f34daff7 | 2103 | |
0d0c377a DG |
2104 | if (ret < 0) { |
2105 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
2106 | goto error; |
2107 | } | |
19e70852 | 2108 | |
0d0c377a DG |
2109 | kernel_wait_quiescent(kernel_tracer_fd); |
2110 | break; | |
2111 | default: | |
2112 | /* TODO: Userspace tracing */ | |
2113 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 2114 | goto error; |
f3ed775e | 2115 | } |
19e70852 | 2116 | ret = LTTCOMM_OK; |
894be886 DG |
2117 | break; |
2118 | } | |
0d0c377a | 2119 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 2120 | { |
9f19cc17 DG |
2121 | int size, i; |
2122 | char *channel_name; | |
7d29a247 | 2123 | struct ltt_kernel_channel *kchan; |
0d0c377a | 2124 | struct ltt_kernel_event *kevent; |
9f19cc17 | 2125 | struct lttng_event *event_list; |
7d29a247 | 2126 | struct lttng_channel *chan; |
33a2b854 DG |
2127 | |
2128 | /* Setup lttng message with no payload */ | |
2129 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2130 | if (ret < 0) { | |
2131 | goto setup_error; | |
2132 | } | |
2133 | ||
2134 | DBG("Enabling all kernel event"); | |
2135 | ||
7d29a247 DG |
2136 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2137 | ||
0d0c377a DG |
2138 | switch (cmd_ctx->lsm->domain.type) { |
2139 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2140 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2141 | cmd_ctx->session->kernel_session); |
2142 | if (kchan == NULL) { | |
2143 | DBG("Channel not found. Creating channel %s", channel_name); | |
2144 | ||
2145 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2146 | if (chan == NULL) { | |
2147 | ret = LTTCOMM_FATAL; | |
2148 | goto error; | |
2149 | } | |
2150 | ||
2151 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2152 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2153 | if (ret < 0) { | |
2154 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2155 | goto error; | |
2156 | } | |
62499ad6 | 2157 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2158 | cmd_ctx->session->kernel_session); |
2159 | if (kchan == NULL) { | |
b389abbe MD |
2160 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2161 | channel_name); | |
2162 | ret = LTTCOMM_FATAL; | |
2163 | goto error; | |
7d29a247 | 2164 | } |
b389abbe | 2165 | } |
7d29a247 | 2166 | |
0d0c377a DG |
2167 | /* For each event in the kernel session */ |
2168 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
2169 | DBG("Enabling kernel event %s for channel %s.", | |
2170 | kevent->event->name, channel_name); | |
2171 | ret = kernel_enable_event(kevent); | |
7d29a247 | 2172 | if (ret < 0) { |
0d0c377a | 2173 | continue; |
7d29a247 DG |
2174 | } |
2175 | } | |
33a2b854 | 2176 | |
0d0c377a DG |
2177 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
2178 | if (size < 0) { | |
2179 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2180 | goto error; | |
f3ed775e | 2181 | } |
f3ed775e | 2182 | |
0d0c377a | 2183 | for (i = 0; i < size; i++) { |
62499ad6 | 2184 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
0d0c377a DG |
2185 | if (kevent == NULL) { |
2186 | /* Default event type for enable all */ | |
2187 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
2188 | /* Enable each single tracepoint event */ | |
2189 | ret = kernel_create_event(&event_list[i], kchan); | |
2190 | if (ret < 0) { | |
2191 | /* Ignore error here and continue */ | |
2192 | } | |
950131af | 2193 | } |
33a2b854 | 2194 | } |
33a2b854 | 2195 | |
0d0c377a DG |
2196 | free(event_list); |
2197 | ||
2198 | /* Quiescent wait after event enable */ | |
2199 | kernel_wait_quiescent(kernel_tracer_fd); | |
2200 | break; | |
2201 | default: | |
2202 | /* TODO: Userspace tracing */ | |
2203 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2204 | goto error; | |
2205 | } | |
33a2b854 DG |
2206 | |
2207 | ret = LTTCOMM_OK; | |
2208 | break; | |
2209 | } | |
052da939 | 2210 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2211 | { |
9f19cc17 | 2212 | struct lttng_event *events; |
052da939 DG |
2213 | ssize_t nb_events = 0; |
2214 | ||
2215 | switch (cmd_ctx->lsm->domain.type) { | |
2216 | case LTTNG_DOMAIN_KERNEL: | |
2217 | DBG("Listing kernel events"); | |
2218 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
2219 | if (nb_events < 0) { | |
2220 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2221 | goto error; | |
2222 | } | |
2223 | break; | |
2224 | default: | |
2225 | /* TODO: Userspace listing */ | |
2226 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2227 | break; | |
2ef84c95 DG |
2228 | } |
2229 | ||
2230 | /* | |
2231 | * Setup lttng message with payload size set to the event list size in | |
2232 | * bytes and then copy list into the llm payload. | |
2233 | */ | |
052da939 | 2234 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2235 | if (ret < 0) { |
052da939 | 2236 | free(events); |
2ef84c95 DG |
2237 | goto setup_error; |
2238 | } | |
2239 | ||
2240 | /* Copy event list into message payload */ | |
9f19cc17 | 2241 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2242 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2243 | |
9f19cc17 | 2244 | free(events); |
2ef84c95 DG |
2245 | |
2246 | ret = LTTCOMM_OK; | |
2247 | break; | |
2248 | } | |
f3ed775e | 2249 | case LTTNG_START_TRACE: |
8c0faa1d DG |
2250 | { |
2251 | struct ltt_kernel_channel *chan; | |
f3ed775e | 2252 | |
8c0faa1d DG |
2253 | /* Setup lttng message with no payload */ |
2254 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2255 | if (ret < 0) { | |
2256 | goto setup_error; | |
2257 | } | |
2258 | ||
f3ed775e DG |
2259 | /* Kernel tracing */ |
2260 | if (cmd_ctx->session->kernel_session != NULL) { | |
2261 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
2262 | DBG("Open kernel metadata"); | |
58a97671 | 2263 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
63053e7c | 2264 | cmd_ctx->session->kernel_session->trace_path); |
f3ed775e DG |
2265 | if (ret < 0) { |
2266 | ret = LTTCOMM_KERN_META_FAIL; | |
2267 | goto error; | |
2268 | } | |
2269 | } | |
8c0faa1d | 2270 | |
f3ed775e DG |
2271 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
2272 | DBG("Opening kernel metadata stream"); | |
2273 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
2274 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
2275 | if (ret < 0) { | |
2276 | ERR("Kernel create metadata stream failed"); | |
2277 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2278 | goto error; | |
2279 | } | |
2280 | } | |
2281 | } | |
8c0faa1d | 2282 | |
f3ed775e | 2283 | /* For each channel */ |
0d0c377a DG |
2284 | cds_list_for_each_entry(chan, |
2285 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
2286 | if (chan->stream_count == 0) { |
2287 | ret = kernel_open_channel_stream(chan); | |
2288 | if (ret < 0) { | |
2289 | ERR("Kernel create channel stream failed"); | |
2290 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2291 | goto error; | |
2292 | } | |
2293 | /* Update the stream global counter */ | |
2294 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
2295 | } | |
2296 | } | |
2297 | ||
283046e0 | 2298 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
8c0faa1d | 2299 | if (ret < 0) { |
f3ed775e | 2300 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2301 | goto error; |
2302 | } | |
8c0faa1d | 2303 | |
283046e0 DG |
2304 | DBG("Start kernel tracing"); |
2305 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
f3ed775e | 2306 | if (ret < 0) { |
283046e0 | 2307 | ERR("Kernel start session failed"); |
f3ed775e | 2308 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2309 | goto error; |
2310 | } | |
8c0faa1d | 2311 | |
f3ed775e DG |
2312 | /* Quiescent wait after starting trace */ |
2313 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2314 | } |
2315 | ||
f3ed775e | 2316 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
2317 | |
2318 | ret = LTTCOMM_OK; | |
2319 | break; | |
2320 | } | |
f3ed775e | 2321 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2322 | { |
f3ed775e | 2323 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
2324 | /* Setup lttng message with no payload */ |
2325 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2326 | if (ret < 0) { | |
2327 | goto setup_error; | |
2328 | } | |
2329 | ||
f3ed775e DG |
2330 | /* Kernel tracer */ |
2331 | if (cmd_ctx->session->kernel_session != NULL) { | |
2332 | DBG("Stop kernel tracing"); | |
84291629 | 2333 | |
f3ed775e DG |
2334 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
2335 | if (ret < 0) { | |
2336 | ERR("Kernel metadata flush failed"); | |
2337 | } | |
8c0faa1d | 2338 | |
f3ed775e DG |
2339 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
2340 | ret = kernel_flush_buffer(chan); | |
2341 | if (ret < 0) { | |
2342 | ERR("Kernel flush buffer error"); | |
2343 | } | |
2344 | } | |
2345 | ||
2346 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
2347 | if (ret < 0) { | |
2348 | ERR("Kernel stop session failed"); | |
2349 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2350 | goto error; | |
2351 | } | |
2352 | ||
2353 | /* Quiescent wait after stopping trace */ | |
2354 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2355 | } |
2356 | ||
f3ed775e | 2357 | /* TODO : User-space tracer */ |
8c0faa1d DG |
2358 | |
2359 | ret = LTTCOMM_OK; | |
2360 | break; | |
2361 | } | |
5e16da05 MD |
2362 | case LTTNG_CREATE_SESSION: |
2363 | { | |
5461b305 DG |
2364 | /* Setup lttng message with no payload */ |
2365 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2366 | if (ret < 0) { | |
2367 | goto setup_error; | |
2368 | } | |
2369 | ||
42abccdb | 2370 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
5e16da05 | 2371 | if (ret < 0) { |
f3ed775e | 2372 | if (ret == -EEXIST) { |
5e16da05 MD |
2373 | ret = LTTCOMM_EXIST_SESS; |
2374 | } else { | |
aaf97519 | 2375 | ret = LTTCOMM_FATAL; |
aaf97519 | 2376 | } |
5461b305 | 2377 | goto error; |
8028d920 | 2378 | } |
1657e9bb | 2379 | |
5461b305 | 2380 | ret = LTTCOMM_OK; |
5e16da05 MD |
2381 | break; |
2382 | } | |
2383 | case LTTNG_DESTROY_SESSION: | |
2384 | { | |
5461b305 DG |
2385 | /* Setup lttng message with no payload */ |
2386 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2387 | if (ret < 0) { | |
2388 | goto setup_error; | |
2389 | } | |
2390 | ||
f3ed775e DG |
2391 | /* Clean kernel session teardown */ |
2392 | teardown_kernel_session(cmd_ctx->session); | |
2393 | ||
42abccdb | 2394 | ret = destroy_session(cmd_ctx->lsm->session.name); |
5e16da05 | 2395 | if (ret < 0) { |
f3ed775e | 2396 | ret = LTTCOMM_FATAL; |
5461b305 | 2397 | goto error; |
5e16da05 | 2398 | } |
1657e9bb | 2399 | |
7a485870 DG |
2400 | /* |
2401 | * Must notify the kernel thread here to update it's pollfd in order to | |
2402 | * remove the channel(s)' fd just destroyed. | |
2403 | */ | |
2404 | ret = notify_kernel_pollfd(); | |
2405 | if (ret < 0) { | |
2406 | ret = LTTCOMM_FATAL; | |
2407 | goto error; | |
2408 | } | |
2409 | ||
5461b305 DG |
2410 | ret = LTTCOMM_OK; |
2411 | break; | |
5e16da05 | 2412 | } |
9f19cc17 | 2413 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2414 | { |
4b222185 | 2415 | size_t nb_dom = 0; |
5461b305 | 2416 | |
9f19cc17 DG |
2417 | if (cmd_ctx->session->kernel_session != NULL) { |
2418 | nb_dom++; | |
ce3d728c | 2419 | } |
520ff687 | 2420 | |
0177d773 | 2421 | nb_dom += cmd_ctx->session->ust_session_list.count; |
9f19cc17 DG |
2422 | |
2423 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2424 | if (ret < 0) { |
2425 | goto setup_error; | |
520ff687 | 2426 | } |
57167058 | 2427 | |
9f19cc17 DG |
2428 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2429 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2430 | |
9f19cc17 | 2431 | /* TODO: User-space tracer domain support */ |
5461b305 | 2432 | ret = LTTCOMM_OK; |
5e16da05 MD |
2433 | break; |
2434 | } | |
9f19cc17 | 2435 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2436 | { |
9f19cc17 DG |
2437 | /* |
2438 | * TODO: Only kernel channels are listed here. UST listing | |
2439 | * is needed on lttng-ust 2.0 release. | |
2440 | */ | |
2441 | size_t nb_chan = 0; | |
2442 | if (cmd_ctx->session->kernel_session != NULL) { | |
2443 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2444 | } |
ca95a216 | 2445 | |
9f19cc17 DG |
2446 | ret = setup_lttng_msg(cmd_ctx, |
2447 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2448 | if (ret < 0) { |
2449 | goto setup_error; | |
2450 | } | |
9f19cc17 DG |
2451 | |
2452 | list_lttng_channels(cmd_ctx->session, | |
2453 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2454 | ||
2455 | ret = LTTCOMM_OK; | |
5461b305 | 2456 | break; |
5e16da05 | 2457 | } |
9f19cc17 | 2458 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2459 | { |
9f19cc17 DG |
2460 | /* |
2461 | * TODO: Only kernel events are listed here. UST listing | |
2462 | * is needed on lttng-ust 2.0 release. | |
2463 | */ | |
2464 | size_t nb_event = 0; | |
2465 | struct ltt_kernel_channel *kchan = NULL; | |
2466 | ||
2467 | if (cmd_ctx->session->kernel_session != NULL) { | |
62499ad6 | 2468 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.list.channel_name, |
9f19cc17 DG |
2469 | cmd_ctx->session->kernel_session); |
2470 | if (kchan == NULL) { | |
2471 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2472 | goto error; | |
2473 | } | |
2474 | nb_event += kchan->event_count; | |
5461b305 | 2475 | } |
ca95a216 | 2476 | |
9f19cc17 DG |
2477 | ret = setup_lttng_msg(cmd_ctx, |
2478 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2479 | if (ret < 0) { |
2480 | goto setup_error; | |
2481 | } | |
9f19cc17 | 2482 | |
ced2f820 | 2483 | DBG("Listing events (%zu events)", nb_event); |
9f19cc17 DG |
2484 | |
2485 | list_lttng_events(kchan, | |
2486 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2487 | ||
2488 | ret = LTTCOMM_OK; | |
5461b305 | 2489 | break; |
5e16da05 MD |
2490 | } |
2491 | case LTTNG_LIST_SESSIONS: | |
2492 | { | |
6c9cc2ab | 2493 | lock_session_list(); |
5461b305 | 2494 | |
6c9cc2ab | 2495 | if (session_list_ptr->count == 0) { |
f3ed775e | 2496 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2497 | unlock_session_list(); |
5461b305 | 2498 | goto error; |
57167058 | 2499 | } |
5e16da05 | 2500 | |
6c9cc2ab DG |
2501 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2502 | session_list_ptr->count); | |
5461b305 | 2503 | if (ret < 0) { |
36a83748 | 2504 | unlock_session_list(); |
5461b305 | 2505 | goto setup_error; |
e065084a | 2506 | } |
5e16da05 | 2507 | |
6c9cc2ab DG |
2508 | /* Filled the session array */ |
2509 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2510 | ||
2511 | unlock_session_list(); | |
5e16da05 | 2512 | |
5461b305 | 2513 | ret = LTTCOMM_OK; |
5e16da05 MD |
2514 | break; |
2515 | } | |
d0254c7c MD |
2516 | case LTTNG_CALIBRATE: |
2517 | { | |
2518 | /* Setup lttng message with no payload */ | |
2519 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2520 | if (ret < 0) { | |
2521 | goto setup_error; | |
2522 | } | |
2523 | ||
2524 | switch (cmd_ctx->lsm->domain.type) { | |
2525 | case LTTNG_DOMAIN_KERNEL: | |
2526 | { | |
2527 | struct lttng_kernel_calibrate kcalibrate; | |
2528 | ||
2529 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2530 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2531 | if (ret < 0) { | |
2532 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2533 | goto error; | |
2534 | } | |
2535 | break; | |
2536 | } | |
2537 | default: | |
2538 | /* TODO: Userspace tracing */ | |
2539 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2540 | goto error; | |
2541 | } | |
2542 | ret = LTTCOMM_OK; | |
2543 | break; | |
2544 | } | |
d9800920 DG |
2545 | case LTTNG_REGISTER_CONSUMER: |
2546 | { | |
2547 | int sock; | |
2548 | ||
2549 | /* Setup lttng message with no payload */ | |
2550 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2551 | if (ret < 0) { | |
2552 | goto setup_error; | |
2553 | } | |
2554 | ||
2555 | switch (cmd_ctx->lsm->domain.type) { | |
2556 | case LTTNG_DOMAIN_KERNEL: | |
2557 | { | |
2558 | /* Can't register a consumer if there is already one */ | |
2559 | if (cmd_ctx->session->kernel_session->consumer_fd != 0) { | |
2560 | ret = LTTCOMM_CONNECT_FAIL; | |
2561 | goto error; | |
2562 | } | |
2563 | ||
2564 | sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path); | |
2565 | if (sock < 0) { | |
2566 | ret = LTTCOMM_CONNECT_FAIL; | |
2567 | goto error; | |
2568 | } | |
2569 | ||
2570 | cmd_ctx->session->kernel_session->consumer_fd = sock; | |
2571 | break; | |
2572 | } | |
2573 | default: | |
2574 | /* TODO: Userspace tracing */ | |
2575 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2576 | goto error; | |
2577 | } | |
2578 | ||
2579 | ret = LTTCOMM_OK; | |
2580 | break; | |
2581 | } | |
d0254c7c | 2582 | |
5e16da05 MD |
2583 | default: |
2584 | /* Undefined command */ | |
5461b305 DG |
2585 | ret = setup_lttng_msg(cmd_ctx, 0); |
2586 | if (ret < 0) { | |
2587 | goto setup_error; | |
2588 | } | |
2589 | ||
5e16da05 | 2590 | ret = LTTCOMM_UND; |
5461b305 | 2591 | break; |
fac6795d DG |
2592 | } |
2593 | ||
5461b305 DG |
2594 | /* Set return code */ |
2595 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2596 | |
b5541356 DG |
2597 | if (cmd_ctx->session) { |
2598 | unlock_session(cmd_ctx->session); | |
2599 | } | |
2600 | ||
e065084a DG |
2601 | return ret; |
2602 | ||
5461b305 | 2603 | error: |
5461b305 DG |
2604 | if (cmd_ctx->llm == NULL) { |
2605 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2606 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2607 | goto setup_error; |
2608 | } | |
2609 | } | |
e065084a | 2610 | /* Notify client of error */ |
5461b305 | 2611 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2612 | |
5461b305 | 2613 | setup_error: |
b5541356 DG |
2614 | if (cmd_ctx->session) { |
2615 | unlock_session(cmd_ctx->session); | |
2616 | } | |
8028d920 | 2617 | return ret; |
fac6795d DG |
2618 | } |
2619 | ||
1d4b027a | 2620 | /* |
d063d709 DG |
2621 | * This thread manage all clients request using the unix client socket for |
2622 | * communication. | |
1d4b027a DG |
2623 | */ |
2624 | static void *thread_manage_clients(void *data) | |
2625 | { | |
273ea72c DG |
2626 | int sock = 0, ret; |
2627 | struct command_ctx *cmd_ctx = NULL; | |
2628 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2629 | |
2630 | DBG("[thread] Manage client started"); | |
2631 | ||
2632 | ret = lttcomm_listen_unix_sock(client_sock); | |
2633 | if (ret < 0) { | |
2634 | goto error; | |
2635 | } | |
2636 | ||
273ea72c DG |
2637 | /* First fd is always the quit pipe */ |
2638 | pollfd[0].fd = thread_quit_pipe[0]; | |
85611738 DG |
2639 | pollfd[0].events = |
2640 | POLLHUP | POLLNVAL | POLLERR | POLLIN | POLLRDHUP | POLLPRI; | |
273ea72c DG |
2641 | |
2642 | /* Apps socket */ | |
2643 | pollfd[1].fd = client_sock; | |
2644 | pollfd[1].events = POLLIN; | |
2645 | ||
bbd973c2 DG |
2646 | /* |
2647 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
2648 | */ |
2649 | if (opt_sig_parent) { | |
2650 | kill(ppid, SIGCHLD); | |
2651 | } | |
2652 | ||
2653 | while (1) { | |
1d4b027a | 2654 | DBG("Accepting client command ..."); |
273ea72c DG |
2655 | |
2656 | /* Inifinite blocking call, waiting for transmission */ | |
2657 | ret = poll(pollfd, 2, -1); | |
2658 | if (ret < 0) { | |
2659 | perror("poll client thread"); | |
2660 | goto error; | |
2661 | } | |
2662 | ||
2663 | /* Thread quit pipe has been closed. Killing thread. */ | |
2664 | if (pollfd[0].revents == POLLNVAL) { | |
2665 | goto error; | |
273ea72c DG |
2666 | } |
2667 | ||
bbd973c2 DG |
2668 | switch (pollfd[1].revents) { |
2669 | case POLLNVAL: | |
2670 | case POLLHUP: | |
2671 | case POLLERR: | |
2672 | ERR("Client socket poll error"); | |
1d4b027a | 2673 | goto error; |
bbd973c2 DG |
2674 | case POLLIN: |
2675 | sock = lttcomm_accept_unix_sock(client_sock); | |
2676 | if (sock < 0) { | |
2677 | goto error; | |
2678 | } | |
1d4b027a | 2679 | |
bbd973c2 DG |
2680 | /* Allocate context command to process the client request */ |
2681 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
1d4b027a | 2682 | |
bbd973c2 DG |
2683 | /* Allocate data buffer for reception */ |
2684 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2685 | cmd_ctx->llm = NULL; | |
2686 | cmd_ctx->session = NULL; | |
1d4b027a | 2687 | |
bbd973c2 DG |
2688 | /* |
2689 | * Data is received from the lttng client. The struct | |
2690 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2691 | * the client. | |
2692 | */ | |
2693 | DBG("Receiving data from client ..."); | |
2694 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2695 | if (ret <= 0) { | |
2696 | continue; | |
2697 | } | |
1d4b027a | 2698 | |
bbd973c2 | 2699 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
f7776ea7 | 2700 | |
bbd973c2 DG |
2701 | /* |
2702 | * This function dispatch the work to the kernel or userspace tracer | |
2703 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2704 | * informations for the client. The command context struct contains | |
2705 | * everything this function may needs. | |
2706 | */ | |
2707 | ret = process_client_msg(cmd_ctx); | |
2708 | if (ret < 0) { | |
2709 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2710 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2711 | /* Error detected but still accept command */ | |
2712 | clean_command_ctx(&cmd_ctx); | |
2713 | continue; | |
2714 | } | |
1d4b027a | 2715 | |
bbd973c2 DG |
2716 | DBG("Sending response (size: %d, retcode: %d)", |
2717 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2718 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2719 | if (ret < 0) { | |
2720 | ERR("Failed to send data back to client"); | |
2721 | } | |
1d4b027a | 2722 | |
bbd973c2 | 2723 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 | 2724 | |
bbd973c2 DG |
2725 | /* End of transmission */ |
2726 | close(sock); | |
2727 | break; | |
2728 | } | |
1d4b027a DG |
2729 | } |
2730 | ||
2731 | error: | |
273ea72c DG |
2732 | DBG("Client thread dying"); |
2733 | if (client_sock) { | |
2734 | close(client_sock); | |
2735 | } | |
2736 | if (sock) { | |
2737 | close(sock); | |
2738 | } | |
2739 | ||
2740 | unlink(client_unix_sock_path); | |
2741 | ||
a2fb29a5 | 2742 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2743 | return NULL; |
2744 | } | |
2745 | ||
2746 | ||
fac6795d DG |
2747 | /* |
2748 | * usage function on stderr | |
2749 | */ | |
2750 | static void usage(void) | |
2751 | { | |
b716ce68 | 2752 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2753 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2754 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2755 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2756 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2757 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2758 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2759 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2760 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2761 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2762 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2763 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2764 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2765 | } |
2766 | ||
2767 | /* | |
2768 | * daemon argument parsing | |
2769 | */ | |
2770 | static int parse_args(int argc, char **argv) | |
2771 | { | |
2772 | int c; | |
2773 | ||
2774 | static struct option long_options[] = { | |
2775 | { "client-sock", 1, 0, 'c' }, | |
2776 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2777 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2778 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2779 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2780 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2781 | { "help", 0, 0, 'h' }, |
2782 | { "group", 1, 0, 'g' }, | |
2783 | { "version", 0, 0, 'V' }, | |
75462a81 | 2784 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2785 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2786 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2787 | { NULL, 0, 0, 0 } |
2788 | }; | |
2789 | ||
2790 | while (1) { | |
2791 | int option_index = 0; | |
31f73cc9 | 2792 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2793 | if (c == -1) { |
2794 | break; | |
2795 | } | |
2796 | ||
2797 | switch (c) { | |
2798 | case 0: | |
2799 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2800 | if (optarg) { | |
2801 | fprintf(stderr, " with arg %s\n", optarg); | |
2802 | } | |
2803 | break; | |
b716ce68 | 2804 | case 'c': |
fac6795d DG |
2805 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2806 | break; | |
2807 | case 'a': | |
2808 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2809 | break; | |
2810 | case 'd': | |
2811 | opt_daemon = 1; | |
2812 | break; | |
2813 | case 'g': | |
2814 | opt_tracing_group = strdup(optarg); | |
2815 | break; | |
2816 | case 'h': | |
2817 | usage(); | |
2818 | exit(EXIT_FAILURE); | |
2819 | case 'V': | |
2820 | fprintf(stdout, "%s\n", VERSION); | |
2821 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2822 | case 'S': |
2823 | opt_sig_parent = 1; | |
2824 | break; | |
d6f42150 DG |
2825 | case 'E': |
2826 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2827 | break; | |
2828 | case 'C': | |
2829 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2830 | break; | |
75462a81 DG |
2831 | case 'q': |
2832 | opt_quiet = 1; | |
2833 | break; | |
3f9947db | 2834 | case 'v': |
53086306 DG |
2835 | /* Verbose level can increase using multiple -v */ |
2836 | opt_verbose += 1; | |
3f9947db | 2837 | break; |
31f73cc9 MD |
2838 | case 'Z': |
2839 | opt_verbose_kconsumerd += 1; | |
2840 | break; | |
fac6795d DG |
2841 | default: |
2842 | /* Unknown option or other error. | |
2843 | * Error is printed by getopt, just return */ | |
2844 | return -1; | |
2845 | } | |
2846 | } | |
2847 | ||
2848 | return 0; | |
2849 | } | |
2850 | ||
2851 | /* | |
d063d709 | 2852 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2853 | * apps_sock - The communication socket for all UST apps. |
2854 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2855 | */ |
cf3af59e | 2856 | static int init_daemon_socket(void) |
fac6795d DG |
2857 | { |
2858 | int ret = 0; | |
2859 | mode_t old_umask; | |
2860 | ||
2861 | old_umask = umask(0); | |
2862 | ||
2863 | /* Create client tool unix socket */ | |
d6f42150 DG |
2864 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2865 | if (client_sock < 0) { | |
2866 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2867 | ret = -1; |
2868 | goto end; | |
2869 | } | |
2870 | ||
2871 | /* File permission MUST be 660 */ | |
2872 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2873 | if (ret < 0) { | |
d6f42150 | 2874 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2875 | perror("chmod"); |
2876 | goto end; | |
2877 | } | |
2878 | ||
2879 | /* Create the application unix socket */ | |
d6f42150 DG |
2880 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2881 | if (apps_sock < 0) { | |
2882 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2883 | ret = -1; |
2884 | goto end; | |
2885 | } | |
2886 | ||
d6f42150 | 2887 | /* File permission MUST be 666 */ |
fac6795d DG |
2888 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2889 | if (ret < 0) { | |
d6f42150 | 2890 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2891 | perror("chmod"); |
2892 | goto end; | |
2893 | } | |
2894 | ||
2895 | end: | |
2896 | umask(old_umask); | |
2897 | return ret; | |
2898 | } | |
2899 | ||
2900 | /* | |
7d8234d9 MD |
2901 | * Check if the global socket is available, and if a daemon is answering |
2902 | * at the other side. If yes, error is returned. | |
fac6795d | 2903 | */ |
cf3af59e | 2904 | static int check_existing_daemon(void) |
fac6795d | 2905 | { |
7d8234d9 | 2906 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 2907 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 2908 | return 0; |
099e26bd | 2909 | } |
7d8234d9 | 2910 | /* Is there anybody out there ? */ |
099e26bd | 2911 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 2912 | return -EEXIST; |
099e26bd | 2913 | } else { |
7d8234d9 | 2914 | return 0; |
099e26bd | 2915 | } |
fac6795d DG |
2916 | } |
2917 | ||
fac6795d | 2918 | /* |
d063d709 | 2919 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2920 | * |
d063d709 DG |
2921 | * Race window between mkdir and chown is OK because we are going from more |
2922 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2923 | */ |
d6f42150 | 2924 | static int set_permissions(void) |
fac6795d DG |
2925 | { |
2926 | int ret; | |
996b65c8 | 2927 | gid_t gid; |
fac6795d | 2928 | |
996b65c8 MD |
2929 | gid = allowed_group(); |
2930 | if (gid < 0) { | |
a463f419 DG |
2931 | if (is_root) { |
2932 | WARN("No tracing group detected"); | |
2933 | ret = 0; | |
2934 | } else { | |
2935 | ERR("Missing tracing group. Aborting execution."); | |
2936 | ret = -1; | |
2937 | } | |
fac6795d DG |
2938 | goto end; |
2939 | } | |
2940 | ||
d6f42150 | 2941 | /* Set lttng run dir */ |
996b65c8 | 2942 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
2943 | if (ret < 0) { |
2944 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2945 | perror("chown"); | |
2946 | } | |
2947 | ||
2948 | /* lttng client socket path */ | |
996b65c8 | 2949 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 2950 | if (ret < 0) { |
d6f42150 DG |
2951 | ERR("Unable to set group on %s", client_unix_sock_path); |
2952 | perror("chown"); | |
2953 | } | |
2954 | ||
2955 | /* kconsumerd error socket path */ | |
996b65c8 | 2956 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
2957 | if (ret < 0) { |
2958 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2959 | perror("chown"); |
2960 | } | |
2961 | ||
d6f42150 | 2962 | DBG("All permissions are set"); |
e07ae692 | 2963 | |
fac6795d DG |
2964 | end: |
2965 | return ret; | |
2966 | } | |
2967 | ||
7a485870 | 2968 | /* |
d063d709 | 2969 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2970 | */ |
2971 | static int create_kernel_poll_pipe(void) | |
2972 | { | |
2973 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2974 | } | |
2975 | ||
099e26bd DG |
2976 | /* |
2977 | * Create the application command pipe to wake thread_manage_apps. | |
2978 | */ | |
2979 | static int create_apps_cmd_pipe(void) | |
2980 | { | |
2981 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
2982 | } | |
2983 | ||
d6f42150 | 2984 | /* |
d063d709 | 2985 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2986 | */ |
2987 | static int create_lttng_rundir(void) | |
2988 | { | |
2989 | int ret; | |
2990 | ||
2991 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2992 | if (ret < 0) { | |
b1f11e69 DG |
2993 | if (errno != EEXIST) { |
2994 | ERR("Unable to create " LTTNG_RUNDIR); | |
2995 | goto error; | |
2996 | } else { | |
2997 | ret = 0; | |
2998 | } | |
d6f42150 DG |
2999 | } |
3000 | ||
3001 | error: | |
3002 | return ret; | |
3003 | } | |
3004 | ||
3005 | /* | |
d063d709 DG |
3006 | * Setup sockets and directory needed by the kconsumerd communication with the |
3007 | * session daemon. | |
d6f42150 DG |
3008 | */ |
3009 | static int set_kconsumerd_sockets(void) | |
3010 | { | |
3011 | int ret; | |
3012 | ||
3013 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
3014 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
3015 | } | |
3016 | ||
3017 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
3018 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
3019 | } | |
3020 | ||
3021 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
3022 | if (ret < 0) { | |
6beb2242 DG |
3023 | if (errno != EEXIST) { |
3024 | ERR("Failed to create " KCONSUMERD_PATH); | |
3025 | goto error; | |
3026 | } | |
3027 | ret = 0; | |
d6f42150 DG |
3028 | } |
3029 | ||
3030 | /* Create the kconsumerd error unix socket */ | |
3031 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
3032 | if (kconsumerd_err_sock < 0) { | |
3033 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
3034 | ret = -1; | |
3035 | goto error; | |
3036 | } | |
3037 | ||
3038 | /* File permission MUST be 660 */ | |
3039 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3040 | if (ret < 0) { | |
3041 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
3042 | perror("chmod"); | |
3043 | goto error; | |
3044 | } | |
3045 | ||
3046 | error: | |
3047 | return ret; | |
3048 | } | |
3049 | ||
fac6795d | 3050 | /* |
d063d709 | 3051 | * Signal handler for the daemon |
cf3af59e MD |
3052 | * |
3053 | * Simply stop all worker threads, leaving main() return gracefully | |
3054 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
3055 | */ |
3056 | static void sighandler(int sig) | |
3057 | { | |
3058 | switch (sig) { | |
cf3af59e MD |
3059 | case SIGPIPE: |
3060 | DBG("SIGPIPE catched"); | |
3061 | return; | |
3062 | case SIGINT: | |
3063 | DBG("SIGINT catched"); | |
3064 | stop_threads(); | |
3065 | break; | |
3066 | case SIGTERM: | |
3067 | DBG("SIGTERM catched"); | |
3068 | stop_threads(); | |
3069 | break; | |
3070 | default: | |
3071 | break; | |
fac6795d | 3072 | } |
fac6795d DG |
3073 | } |
3074 | ||
3075 | /* | |
d063d709 | 3076 | * Setup signal handler for : |
1d4b027a | 3077 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3078 | */ |
1d4b027a | 3079 | static int set_signal_handler(void) |
fac6795d | 3080 | { |
1d4b027a DG |
3081 | int ret = 0; |
3082 | struct sigaction sa; | |
3083 | sigset_t sigset; | |
fac6795d | 3084 | |
1d4b027a DG |
3085 | if ((ret = sigemptyset(&sigset)) < 0) { |
3086 | perror("sigemptyset"); | |
3087 | return ret; | |
3088 | } | |
d6f42150 | 3089 | |
1d4b027a DG |
3090 | sa.sa_handler = sighandler; |
3091 | sa.sa_mask = sigset; | |
3092 | sa.sa_flags = 0; | |
3093 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3094 | perror("sigaction"); | |
3095 | return ret; | |
d6f42150 DG |
3096 | } |
3097 | ||
1d4b027a DG |
3098 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3099 | perror("sigaction"); | |
3100 | return ret; | |
d6f42150 | 3101 | } |
aaf26714 | 3102 | |
1d4b027a DG |
3103 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3104 | perror("sigaction"); | |
3105 | return ret; | |
8c0faa1d DG |
3106 | } |
3107 | ||
1d4b027a DG |
3108 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3109 | ||
3110 | return ret; | |
fac6795d DG |
3111 | } |
3112 | ||
f3ed775e | 3113 | /* |
d063d709 DG |
3114 | * Set open files limit to unlimited. This daemon can open a large number of |
3115 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3116 | */ |
3117 | static void set_ulimit(void) | |
3118 | { | |
3119 | int ret; | |
3120 | struct rlimit lim; | |
3121 | ||
a88df331 | 3122 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3123 | lim.rlim_cur = 65535; |
3124 | lim.rlim_max = 65535; | |
3125 | ||
3126 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3127 | if (ret < 0) { | |
3128 | perror("failed to set open files limit"); | |
3129 | } | |
3130 | } | |
3131 | ||
fac6795d DG |
3132 | /* |
3133 | * main | |
3134 | */ | |
3135 | int main(int argc, char **argv) | |
3136 | { | |
fac6795d DG |
3137 | int ret = 0; |
3138 | void *status; | |
b082db07 | 3139 | const char *home_path; |
fac6795d | 3140 | |
273ea72c | 3141 | /* Create thread quit pipe */ |
cf3af59e MD |
3142 | if ((ret = init_thread_quit_pipe()) < 0) { |
3143 | goto error; | |
273ea72c DG |
3144 | } |
3145 | ||
fac6795d DG |
3146 | /* Parse arguments */ |
3147 | progname = argv[0]; | |
3148 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3149 | goto error; |
fac6795d DG |
3150 | } |
3151 | ||
3152 | /* Daemonize */ | |
3153 | if (opt_daemon) { | |
53094c05 DG |
3154 | ret = daemon(0, 0); |
3155 | if (ret < 0) { | |
3156 | perror("daemon"); | |
cf3af59e | 3157 | goto error; |
53094c05 | 3158 | } |
fac6795d DG |
3159 | } |
3160 | ||
3161 | /* Check if daemon is UID = 0 */ | |
3162 | is_root = !getuid(); | |
3163 | ||
fac6795d | 3164 | if (is_root) { |
d6f42150 DG |
3165 | ret = create_lttng_rundir(); |
3166 | if (ret < 0) { | |
cf3af59e | 3167 | goto error; |
d6f42150 DG |
3168 | } |
3169 | ||
fac6795d | 3170 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3171 | snprintf(apps_unix_sock_path, PATH_MAX, |
3172 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3173 | } |
3174 | ||
3175 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3176 | snprintf(client_unix_sock_path, PATH_MAX, |
3177 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
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_GLOBAL_APPS_WAIT_SHM_PATH); | |
3184 | } | |
fac6795d | 3185 | } else { |
b082db07 DG |
3186 | home_path = get_home_dir(); |
3187 | if (home_path == NULL) { | |
273ea72c DG |
3188 | /* TODO: Add --socket PATH option */ |
3189 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3190 | ret = -EPERM; |
3191 | goto error; | |
b082db07 DG |
3192 | } |
3193 | ||
fac6795d | 3194 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3195 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3196 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3197 | } |
3198 | ||
3199 | /* Set the cli tool unix socket path */ | |
3200 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3201 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3202 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3203 | } |
0fdd1e2c DG |
3204 | |
3205 | /* Set global SHM for ust */ | |
3206 | if (strlen(wait_shm_path) == 0) { | |
3207 | snprintf(wait_shm_path, PATH_MAX, | |
3208 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3209 | } | |
fac6795d DG |
3210 | } |
3211 | ||
847177cd DG |
3212 | DBG("Client socket path %s", client_unix_sock_path); |
3213 | DBG("Application socket path %s", apps_unix_sock_path); | |
3214 | ||
273ea72c | 3215 | /* |
7d8234d9 | 3216 | * See if daemon already exist. |
fac6795d | 3217 | */ |
7d8234d9 | 3218 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3219 | ERR("Already running daemon.\n"); |
273ea72c | 3220 | /* |
cf3af59e MD |
3221 | * We do not goto exit because we must not cleanup() |
3222 | * because a daemon is already running. | |
ab118b20 | 3223 | */ |
cf3af59e | 3224 | goto error; |
a88df331 DG |
3225 | } |
3226 | ||
3227 | /* After this point, we can safely call cleanup() so goto error is used */ | |
3228 | ||
3229 | /* | |
3230 | * These actions must be executed as root. We do that *after* setting up | |
3231 | * the sockets path because we MUST make the check for another daemon using | |
3232 | * those paths *before* trying to set the kernel consumer sockets and init | |
3233 | * kernel tracer. | |
3234 | */ | |
3235 | if (is_root) { | |
3236 | ret = set_kconsumerd_sockets(); | |
3237 | if (ret < 0) { | |
cf3af59e | 3238 | goto exit; |
a88df331 DG |
3239 | } |
3240 | ||
3241 | /* Setup kernel tracer */ | |
3242 | init_kernel_tracer(); | |
3243 | ||
3244 | /* Set ulimit for open files */ | |
3245 | set_ulimit(); | |
fac6795d DG |
3246 | } |
3247 | ||
cf3af59e MD |
3248 | if ((ret = set_signal_handler()) < 0) { |
3249 | goto exit; | |
fac6795d DG |
3250 | } |
3251 | ||
d6f42150 | 3252 | /* Setup the needed unix socket */ |
cf3af59e MD |
3253 | if ((ret = init_daemon_socket()) < 0) { |
3254 | goto exit; | |
fac6795d DG |
3255 | } |
3256 | ||
3257 | /* Set credentials to socket */ | |
cf3af59e MD |
3258 | if (is_root && ((ret = set_permissions()) < 0)) { |
3259 | goto exit; | |
fac6795d DG |
3260 | } |
3261 | ||
5b8719f5 DG |
3262 | /* Get parent pid if -S, --sig-parent is specified. */ |
3263 | if (opt_sig_parent) { | |
3264 | ppid = getppid(); | |
3265 | } | |
3266 | ||
7a485870 | 3267 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3268 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3269 | goto exit; | |
7a485870 DG |
3270 | } |
3271 | ||
099e26bd DG |
3272 | /* Setup the thread apps communication pipe. */ |
3273 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3274 | goto exit; | |
3275 | } | |
3276 | ||
3277 | /* Init UST command queue. */ | |
3278 | cds_wfq_init(&ust_cmd_queue.queue); | |
3279 | ||
273ea72c DG |
3280 | /* |
3281 | * Get session list pointer. This pointer MUST NOT be free(). | |
3282 | * This list is statically declared in session.c | |
3283 | */ | |
b5541356 DG |
3284 | session_list_ptr = get_session_list(); |
3285 | ||
cf3af59e | 3286 | /* Create thread to manage the client socket */ |
099e26bd DG |
3287 | ret = pthread_create(&client_thread, NULL, |
3288 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3289 | if (ret != 0) { |
099e26bd | 3290 | perror("pthread_create clients"); |
cf3af59e MD |
3291 | goto exit_client; |
3292 | } | |
fac6795d | 3293 | |
099e26bd DG |
3294 | /* Create thread to dispatch registration */ |
3295 | ret = pthread_create(&dispatch_thread, NULL, | |
3296 | thread_dispatch_ust_registration, (void *) NULL); | |
3297 | if (ret != 0) { | |
3298 | perror("pthread_create dispatch"); | |
3299 | goto exit_dispatch; | |
3300 | } | |
3301 | ||
3302 | /* Create thread to manage application registration. */ | |
3303 | ret = pthread_create(®_apps_thread, NULL, | |
3304 | thread_registration_apps, (void *) NULL); | |
3305 | if (ret != 0) { | |
3306 | perror("pthread_create registration"); | |
3307 | goto exit_reg_apps; | |
3308 | } | |
3309 | ||
cf3af59e MD |
3310 | /* Create thread to manage application socket */ |
3311 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
3312 | if (ret != 0) { | |
099e26bd | 3313 | perror("pthread_create apps"); |
cf3af59e MD |
3314 | goto exit_apps; |
3315 | } | |
fac6795d | 3316 | |
cf3af59e MD |
3317 | /* Create kernel thread to manage kernel event */ |
3318 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
3319 | if (ret != 0) { | |
099e26bd | 3320 | perror("pthread_create kernel"); |
cf3af59e MD |
3321 | goto exit_kernel; |
3322 | } | |
7a485870 | 3323 | |
cf3af59e MD |
3324 | ret = pthread_join(kernel_thread, &status); |
3325 | if (ret != 0) { | |
3326 | perror("pthread_join"); | |
3327 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3328 | } |
3329 | ||
cf3af59e MD |
3330 | exit_kernel: |
3331 | ret = pthread_join(apps_thread, &status); | |
3332 | if (ret != 0) { | |
3333 | perror("pthread_join"); | |
3334 | goto error; /* join error, exit without cleanup */ | |
3335 | } | |
fac6795d | 3336 | |
cf3af59e | 3337 | exit_apps: |
099e26bd DG |
3338 | ret = pthread_join(reg_apps_thread, &status); |
3339 | if (ret != 0) { | |
3340 | perror("pthread_join"); | |
3341 | goto error; /* join error, exit without cleanup */ | |
3342 | } | |
3343 | ||
3344 | exit_reg_apps: | |
3345 | ret = pthread_join(dispatch_thread, &status); | |
3346 | if (ret != 0) { | |
3347 | perror("pthread_join"); | |
3348 | goto error; /* join error, exit without cleanup */ | |
3349 | } | |
3350 | ||
3351 | exit_dispatch: | |
cf3af59e MD |
3352 | ret = pthread_join(client_thread, &status); |
3353 | if (ret != 0) { | |
3354 | perror("pthread_join"); | |
3355 | goto error; /* join error, exit without cleanup */ | |
3356 | } | |
3357 | ||
3358 | ret = join_kconsumerd_thread(); | |
3359 | if (ret != 0) { | |
3360 | perror("join_kconsumerd"); | |
3361 | goto error; /* join error, exit without cleanup */ | |
3362 | } | |
a88df331 | 3363 | |
cf3af59e | 3364 | exit_client: |
a88df331 | 3365 | exit: |
cf3af59e MD |
3366 | /* |
3367 | * cleanup() is called when no other thread is running. | |
3368 | */ | |
3369 | cleanup(); | |
3370 | if (!ret) | |
3371 | exit(EXIT_SUCCESS); | |
3372 | error: | |
5e16da05 | 3373 | exit(EXIT_FAILURE); |
fac6795d | 3374 | } |