Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
996b65c8 | 3 | * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
7 | * as published by the Free Software Foundation; only version 2 |
8 | * of the License. | |
91d76f53 | 9 | * |
fac6795d DG |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
fac6795d DG |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
7a485870 | 25 | #include <poll.h> |
fac6795d | 26 | #include <pthread.h> |
8c0faa1d | 27 | #include <semaphore.h> |
fac6795d DG |
28 | #include <signal.h> |
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
37 | #include <unistd.h> | |
38 | ||
1e307fab | 39 | #include <ltt-kconsumerd.h> |
e88129fc | 40 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
41 | #include <lttng/lttng-kconsumerd.h> |
42 | #include <lttngerr.h> | |
fac6795d | 43 | |
20fe2104 | 44 | #include "kernel-ctl.h" |
1e307fab | 45 | #include "ltt-sessiond.h" |
91d76f53 | 46 | #include "traceable-app.h" |
1e307fab | 47 | #include "ust-ctl.h" |
8e68d1c8 | 48 | #include "utils.h" |
fac6795d | 49 | |
75462a81 | 50 | /* Const values */ |
686204ab | 51 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 52 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
53 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
54 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
55 | ||
fac6795d | 56 | /* Variables */ |
1d4b027a | 57 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 58 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 59 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 60 | |
fac6795d DG |
61 | const char *progname; |
62 | const char *opt_tracing_group; | |
5b8719f5 | 63 | static int opt_sig_parent; |
fac6795d DG |
64 | static int opt_daemon; |
65 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
66 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67 | static pid_t kconsumerd_pid; | |
7a485870 | 68 | static struct pollfd *kernel_pollfd; |
fac6795d | 69 | |
d6f42150 DG |
70 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
71 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
72 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
73 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
fac6795d | 74 | |
1d4b027a | 75 | /* Sockets and FDs */ |
d6f42150 DG |
76 | static int client_sock; |
77 | static int apps_sock; | |
78 | static int kconsumerd_err_sock; | |
8c0faa1d | 79 | static int kconsumerd_cmd_sock; |
20fe2104 | 80 | static int kernel_tracer_fd; |
7a485870 | 81 | static int kernel_poll_pipe[2]; |
1d4b027a | 82 | |
273ea72c DG |
83 | /* |
84 | * Quit pipe for all threads. This permits a single cancellation point | |
85 | * for all threads when receiving an event on the pipe. | |
86 | */ | |
87 | static int thread_quit_pipe[2]; | |
88 | ||
1d4b027a | 89 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 90 | static pthread_t kconsumerd_thread; |
1d4b027a DG |
91 | static pthread_t apps_thread; |
92 | static pthread_t client_thread; | |
7a485870 | 93 | static pthread_t kernel_thread; |
8c0faa1d DG |
94 | static sem_t kconsumerd_sem; |
95 | ||
1d4b027a | 96 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
fac6795d | 97 | |
ab147185 MD |
98 | static int modprobe_remove_kernel_modules(void); |
99 | ||
b5541356 DG |
100 | /* |
101 | * Pointer initialized before thread creation. | |
102 | * | |
103 | * This points to the tracing session list containing the session count and a | |
104 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
105 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 106 | * |
d063d709 DG |
107 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
108 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
109 | */ |
110 | static struct ltt_session_list *session_list_ptr; | |
111 | ||
996b65c8 MD |
112 | static gid_t allowed_group(void) |
113 | { | |
114 | struct group *grp; | |
115 | ||
274e143b MD |
116 | if (opt_tracing_group) { |
117 | grp = getgrnam(opt_tracing_group); | |
118 | } else { | |
119 | grp = getgrnam(default_tracing_group); | |
120 | } | |
996b65c8 MD |
121 | if (!grp) { |
122 | return -1; | |
123 | } else { | |
124 | return grp->gr_gid; | |
125 | } | |
126 | } | |
127 | ||
273ea72c DG |
128 | /* |
129 | * Init quit pipe. | |
130 | * | |
131 | * Return -1 on error or 0 if all pipes are created. | |
132 | */ | |
133 | static int init_thread_quit_pipe(void) | |
134 | { | |
135 | int ret; | |
136 | ||
137 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
138 | if (ret < 0) { | |
139 | perror("thread quit pipe"); | |
140 | goto error; | |
141 | } | |
142 | ||
143 | error: | |
144 | return ret; | |
145 | } | |
146 | ||
fac6795d | 147 | /* |
d063d709 DG |
148 | * Complete teardown of a kernel session. This free all data structure related |
149 | * to a kernel session and update counter. | |
fac6795d | 150 | */ |
1d4b027a | 151 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 152 | { |
1d4b027a DG |
153 | if (session->kernel_session != NULL) { |
154 | DBG("Tearing down kernel session"); | |
d9800920 DG |
155 | |
156 | /* | |
157 | * If a custom kernel consumer was registered, close the socket before | |
158 | * tearing down the complete kernel session structure | |
159 | */ | |
160 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
161 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
162 | } | |
163 | ||
c363b55d | 164 | trace_destroy_kernel_session(session->kernel_session); |
1d4b027a DG |
165 | /* Extra precaution */ |
166 | session->kernel_session = NULL; | |
fac6795d | 167 | } |
fac6795d DG |
168 | } |
169 | ||
cf3af59e MD |
170 | static void stop_threads(void) |
171 | { | |
172 | /* Stopping all threads */ | |
173 | DBG("Terminating all threads"); | |
174 | close(thread_quit_pipe[0]); | |
175 | close(thread_quit_pipe[1]); | |
176 | } | |
177 | ||
fac6795d | 178 | /* |
d063d709 | 179 | * Cleanup the daemon |
fac6795d | 180 | */ |
cf3af59e | 181 | static void cleanup(void) |
fac6795d | 182 | { |
1d4b027a DG |
183 | int ret; |
184 | char *cmd; | |
af9737e9 | 185 | struct ltt_session *sess, *stmp; |
fac6795d | 186 | |
1d4b027a | 187 | DBG("Cleaning up"); |
e07ae692 | 188 | |
1d4b027a | 189 | /* <fun> */ |
273ea72c DG |
190 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
191 | "Matthew, BEET driven development works!%c[%dm", | |
192 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 193 | /* </fun> */ |
fac6795d | 194 | |
1d4b027a DG |
195 | DBG("Removing %s directory", LTTNG_RUNDIR); |
196 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
197 | if (ret < 0) { | |
198 | ERR("asprintf failed. Something is really wrong!"); | |
199 | } | |
5461b305 | 200 | |
1d4b027a DG |
201 | /* Remove lttng run directory */ |
202 | ret = system(cmd); | |
203 | if (ret < 0) { | |
204 | ERR("Unable to clean " LTTNG_RUNDIR); | |
205 | } | |
5461b305 | 206 | |
1d4b027a | 207 | DBG("Cleaning up all session"); |
fac6795d | 208 | |
b5541356 | 209 | /* Destroy session list mutex */ |
273ea72c DG |
210 | if (session_list_ptr != NULL) { |
211 | pthread_mutex_destroy(&session_list_ptr->lock); | |
212 | ||
213 | /* Cleanup ALL session */ | |
af9737e9 | 214 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
273ea72c DG |
215 | teardown_kernel_session(sess); |
216 | // TODO complete session cleanup (including UST) | |
217 | } | |
218 | } | |
219 | ||
220 | pthread_mutex_destroy(&kconsumerd_pid_mutex); | |
b5541356 | 221 | |
f3ed775e | 222 | DBG("Closing kernel fd"); |
1d4b027a | 223 | close(kernel_tracer_fd); |
ab147185 MD |
224 | |
225 | DBG("Unloading kernel modules"); | |
226 | modprobe_remove_kernel_modules(); | |
fac6795d DG |
227 | } |
228 | ||
e065084a | 229 | /* |
d063d709 | 230 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 231 | * |
d063d709 | 232 | * Return lttcomm error code. |
e065084a DG |
233 | */ |
234 | static int send_unix_sock(int sock, void *buf, size_t len) | |
235 | { | |
236 | /* Check valid length */ | |
237 | if (len <= 0) { | |
238 | return -1; | |
239 | } | |
240 | ||
241 | return lttcomm_send_unix_sock(sock, buf, len); | |
242 | } | |
243 | ||
5461b305 | 244 | /* |
d063d709 | 245 | * Free memory of a command context structure. |
5461b305 | 246 | */ |
a2fb29a5 | 247 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 248 | { |
a2fb29a5 DG |
249 | DBG("Clean command context structure"); |
250 | if (*cmd_ctx) { | |
251 | if ((*cmd_ctx)->llm) { | |
252 | free((*cmd_ctx)->llm); | |
5461b305 | 253 | } |
a2fb29a5 DG |
254 | if ((*cmd_ctx)->lsm) { |
255 | free((*cmd_ctx)->lsm); | |
5461b305 | 256 | } |
a2fb29a5 DG |
257 | free(*cmd_ctx); |
258 | *cmd_ctx = NULL; | |
5461b305 DG |
259 | } |
260 | } | |
261 | ||
f3ed775e | 262 | /* |
d063d709 | 263 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 264 | */ |
7a485870 | 265 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
266 | { |
267 | int ret; | |
268 | size_t nb_fd; | |
269 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
270 | struct lttcomm_kconsumerd_header lkh; |
271 | struct lttcomm_kconsumerd_msg lkm; | |
272 | ||
7a485870 DG |
273 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
274 | ||
275 | nb_fd = channel->stream_count; | |
f3ed775e DG |
276 | |
277 | /* Setup header */ | |
7a485870 | 278 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
279 | lkh.cmd_type = ADD_STREAM; |
280 | ||
281 | DBG("Sending kconsumerd header"); | |
282 | ||
283 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
284 | if (ret < 0) { | |
285 | perror("send kconsumerd header"); | |
286 | goto error; | |
287 | } | |
288 | ||
7a485870 DG |
289 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
290 | if (stream->fd != 0) { | |
f3ed775e DG |
291 | lkm.fd = stream->fd; |
292 | lkm.state = stream->state; | |
7a485870 | 293 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 294 | lkm.output = channel->channel->attr.output; |
f3ed775e | 295 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 296 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
297 | |
298 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
299 | ||
300 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
301 | if (ret < 0) { | |
302 | perror("send kconsumerd fd"); | |
303 | goto error; | |
304 | } | |
305 | } | |
306 | } | |
307 | ||
7a485870 | 308 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
309 | |
310 | return 0; | |
311 | ||
312 | error: | |
313 | return ret; | |
314 | } | |
315 | ||
316 | /* | |
d063d709 | 317 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 318 | */ |
d9800920 | 319 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
320 | { |
321 | int ret; | |
322 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
323 | struct lttcomm_kconsumerd_header lkh; |
324 | struct lttcomm_kconsumerd_msg lkm; | |
325 | ||
326 | /* Setup header */ | |
327 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
328 | lkh.cmd_type = ADD_STREAM; | |
329 | ||
330 | DBG("Sending kconsumerd header for metadata"); | |
331 | ||
d9800920 | 332 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
7a485870 DG |
333 | if (ret < 0) { |
334 | perror("send kconsumerd header"); | |
335 | goto error; | |
336 | } | |
337 | ||
338 | DBG("Sending metadata stream fd"); | |
339 | ||
d9800920 DG |
340 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
341 | if (session->consumer_fd == 0) { | |
342 | session->consumer_fd = kconsumerd_cmd_sock; | |
343 | } | |
344 | ||
7a485870 DG |
345 | if (session->metadata_stream_fd != 0) { |
346 | /* Send metadata stream fd first */ | |
347 | lkm.fd = session->metadata_stream_fd; | |
348 | lkm.state = ACTIVE_FD; | |
349 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 350 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 351 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 352 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 353 | |
d9800920 | 354 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, &lkm.fd, 1, sizeof(lkm)); |
7a485870 DG |
355 | if (ret < 0) { |
356 | perror("send kconsumerd fd"); | |
357 | goto error; | |
358 | } | |
359 | } | |
f3ed775e | 360 | |
f3ed775e | 361 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 362 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 363 | if (ret < 0) { |
7a485870 | 364 | goto error; |
f3ed775e DG |
365 | } |
366 | } | |
367 | ||
7a485870 DG |
368 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
369 | ||
f3ed775e DG |
370 | return 0; |
371 | ||
372 | error: | |
373 | return ret; | |
374 | } | |
375 | ||
97b1a726 | 376 | #ifdef DISABLED |
fac6795d | 377 | /* |
d063d709 DG |
378 | * Return a socket connected to the libust communication socket of the |
379 | * application identified by the pid. | |
fac6795d | 380 | * |
d063d709 | 381 | * If the pid is not found in the traceable list, return -1 to indicate error. |
fac6795d | 382 | */ |
471d1693 | 383 | static int ust_connect_app(pid_t pid) |
fac6795d | 384 | { |
91d76f53 DG |
385 | int sock; |
386 | struct ltt_traceable_app *lta; | |
379473d2 | 387 | |
e07ae692 DG |
388 | DBG("Connect to application pid %d", pid); |
389 | ||
91d76f53 DG |
390 | lta = find_app_by_pid(pid); |
391 | if (lta == NULL) { | |
392 | /* App not found */ | |
7442b2ba | 393 | DBG("Application pid %d not found", pid); |
379473d2 DG |
394 | return -1; |
395 | } | |
fac6795d | 396 | |
91d76f53 | 397 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 398 | if (sock < 0) { |
62d3069f | 399 | ERR("Fail connecting to the PID %d", pid); |
fac6795d DG |
400 | } |
401 | ||
402 | return sock; | |
403 | } | |
97b1a726 | 404 | #endif /* DISABLED */ |
fac6795d DG |
405 | |
406 | /* | |
d063d709 DG |
407 | * Notify apps by writing 42 to a named pipe using name. Every applications |
408 | * waiting for a ltt-sessiond will be notified and re-register automatically to | |
409 | * the session daemon. | |
fac6795d | 410 | * |
d063d709 | 411 | * Return open or write error value. |
fac6795d DG |
412 | */ |
413 | static int notify_apps(const char *name) | |
414 | { | |
415 | int fd; | |
416 | int ret = -1; | |
417 | ||
e07ae692 DG |
418 | DBG("Notify the global application pipe"); |
419 | ||
fac6795d DG |
420 | /* Try opening the global pipe */ |
421 | fd = open(name, O_WRONLY); | |
422 | if (fd < 0) { | |
423 | goto error; | |
424 | } | |
425 | ||
426 | /* Notify by writing on the pipe */ | |
427 | ret = write(fd, "42", 2); | |
428 | if (ret < 0) { | |
429 | perror("write"); | |
430 | } | |
431 | ||
432 | error: | |
433 | return ret; | |
434 | } | |
435 | ||
e065084a | 436 | /* |
d063d709 DG |
437 | * Setup the outgoing data buffer for the response (llm) by allocating the |
438 | * right amount of memory and copying the original information from the lsm | |
439 | * structure. | |
ca95a216 | 440 | * |
d063d709 | 441 | * Return total size of the buffer pointed by buf. |
ca95a216 | 442 | */ |
5461b305 | 443 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 444 | { |
f3ed775e | 445 | int ret, buf_size; |
ca95a216 | 446 | |
f3ed775e | 447 | buf_size = size; |
5461b305 DG |
448 | |
449 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
450 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 451 | perror("malloc"); |
5461b305 | 452 | ret = -ENOMEM; |
ca95a216 DG |
453 | goto error; |
454 | } | |
455 | ||
5461b305 DG |
456 | /* Copy common data */ |
457 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 458 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 459 | |
5461b305 DG |
460 | cmd_ctx->llm->data_size = size; |
461 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
462 | ||
ca95a216 DG |
463 | return buf_size; |
464 | ||
465 | error: | |
466 | return ret; | |
467 | } | |
468 | ||
7a485870 | 469 | /* |
d063d709 DG |
470 | * Update the kernel pollfd set of all channel fd available over all tracing |
471 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
472 | */ |
473 | static int update_kernel_pollfd(void) | |
474 | { | |
475 | int i = 0; | |
273ea72c DG |
476 | /* |
477 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
478 | * at 2 for those pipes. | |
479 | */ | |
480 | unsigned int nb_fd = 2; | |
7a485870 DG |
481 | struct ltt_session *session; |
482 | struct ltt_kernel_channel *channel; | |
483 | ||
484 | DBG("Updating kernel_pollfd"); | |
485 | ||
486 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 487 | lock_session_list(); |
b5541356 DG |
488 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
489 | lock_session(session); | |
7a485870 | 490 | if (session->kernel_session == NULL) { |
b5541356 | 491 | unlock_session(session); |
7a485870 DG |
492 | continue; |
493 | } | |
494 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 495 | unlock_session(session); |
7a485870 DG |
496 | } |
497 | ||
498 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
499 | ||
500 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
501 | if (kernel_pollfd == NULL) { | |
502 | perror("malloc kernel_pollfd"); | |
503 | goto error; | |
504 | } | |
505 | ||
b5541356 DG |
506 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
507 | lock_session(session); | |
7a485870 | 508 | if (session->kernel_session == NULL) { |
b5541356 | 509 | unlock_session(session); |
7a485870 DG |
510 | continue; |
511 | } | |
512 | if (i >= nb_fd) { | |
513 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 514 | unlock_session(session); |
7a485870 DG |
515 | break; |
516 | } | |
517 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
518 | kernel_pollfd[i].fd = channel->fd; | |
519 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
520 | i++; | |
521 | } | |
b5541356 | 522 | unlock_session(session); |
7a485870 | 523 | } |
6c9cc2ab | 524 | unlock_session_list(); |
7a485870 DG |
525 | |
526 | /* Adding wake up pipe */ | |
273ea72c DG |
527 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
528 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
529 | ||
530 | /* Adding the quit pipe */ | |
531 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
532 | |
533 | return nb_fd; | |
534 | ||
535 | error: | |
6c9cc2ab | 536 | unlock_session_list(); |
7a485870 DG |
537 | return -1; |
538 | } | |
539 | ||
540 | /* | |
d063d709 DG |
541 | * Find the channel fd from 'fd' over all tracing session. When found, check |
542 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 543 | * |
d063d709 | 544 | * Useful for CPU hotplug feature. |
7a485870 DG |
545 | */ |
546 | static int update_kernel_stream(int fd) | |
547 | { | |
548 | int ret = 0; | |
549 | struct ltt_session *session; | |
550 | struct ltt_kernel_channel *channel; | |
551 | ||
552 | DBG("Updating kernel streams for channel fd %d", fd); | |
553 | ||
6c9cc2ab | 554 | lock_session_list(); |
b5541356 DG |
555 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
556 | lock_session(session); | |
7a485870 | 557 | if (session->kernel_session == NULL) { |
b5541356 | 558 | unlock_session(session); |
7a485870 DG |
559 | continue; |
560 | } | |
d9800920 DG |
561 | |
562 | /* This is not suppose to be 0 but this is an extra security check */ | |
563 | if (session->kernel_session->consumer_fd == 0) { | |
564 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
565 | } | |
566 | ||
7a485870 DG |
567 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
568 | if (channel->fd == fd) { | |
569 | DBG("Channel found, updating kernel streams"); | |
570 | ret = kernel_open_channel_stream(channel); | |
571 | if (ret < 0) { | |
572 | goto end; | |
573 | } | |
d9800920 | 574 | |
7a485870 DG |
575 | /* |
576 | * Have we already sent fds to the consumer? If yes, it means that | |
577 | * tracing is started so it is safe to send our updated stream fds. | |
578 | */ | |
579 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
d9800920 DG |
580 | ret = send_kconsumerd_channel_fds(session->kernel_session->consumer_fd, |
581 | channel); | |
7a485870 DG |
582 | if (ret < 0) { |
583 | goto end; | |
584 | } | |
585 | } | |
586 | goto end; | |
587 | } | |
588 | } | |
b5541356 | 589 | unlock_session(session); |
7a485870 DG |
590 | } |
591 | ||
592 | end: | |
6c9cc2ab | 593 | unlock_session_list(); |
b5541356 DG |
594 | if (session) { |
595 | unlock_session(session); | |
596 | } | |
7a485870 DG |
597 | return ret; |
598 | } | |
599 | ||
600 | /* | |
d063d709 | 601 | * This thread manage event coming from the kernel. |
7a485870 | 602 | * |
d063d709 DG |
603 | * Features supported in this thread: |
604 | * -) CPU Hotplug | |
7a485870 DG |
605 | */ |
606 | static void *thread_manage_kernel(void *data) | |
607 | { | |
608 | int ret, i, nb_fd = 0; | |
609 | char tmp; | |
610 | int update_poll_flag = 1; | |
611 | ||
612 | DBG("Thread manage kernel started"); | |
613 | ||
614 | while (1) { | |
615 | if (update_poll_flag == 1) { | |
616 | nb_fd = update_kernel_pollfd(); | |
617 | if (nb_fd < 0) { | |
618 | goto error; | |
619 | } | |
620 | update_poll_flag = 0; | |
621 | } | |
622 | ||
623 | DBG("Polling on %d fds", nb_fd); | |
624 | ||
625 | /* Poll infinite value of time */ | |
626 | ret = poll(kernel_pollfd, nb_fd, -1); | |
627 | if (ret < 0) { | |
628 | perror("poll kernel thread"); | |
629 | goto error; | |
630 | } else if (ret == 0) { | |
631 | /* Should not happen since timeout is infinite */ | |
632 | continue; | |
633 | } | |
634 | ||
273ea72c DG |
635 | /* Thread quit pipe has been closed. Killing thread. */ |
636 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
637 | goto error; | |
638 | } | |
639 | ||
7a485870 DG |
640 | DBG("Kernel poll event triggered"); |
641 | ||
642 | /* | |
643 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
644 | * must be updated. | |
645 | */ | |
273ea72c | 646 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 647 | case POLLIN: |
7a485870 DG |
648 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
649 | update_poll_flag = 1; | |
650 | continue; | |
b5541356 DG |
651 | case POLLERR: |
652 | goto error; | |
653 | default: | |
654 | break; | |
7a485870 DG |
655 | } |
656 | ||
657 | for (i = 0; i < nb_fd; i++) { | |
658 | switch (kernel_pollfd[i].revents) { | |
659 | /* | |
660 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
661 | * session and updating the kernel consumer | |
662 | */ | |
663 | case POLLIN | POLLRDNORM: | |
664 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
665 | if (ret < 0) { | |
666 | continue; | |
667 | } | |
668 | break; | |
669 | } | |
670 | } | |
671 | } | |
672 | ||
673 | error: | |
674 | DBG("Kernel thread dying"); | |
675 | if (kernel_pollfd) { | |
676 | free(kernel_pollfd); | |
677 | } | |
273ea72c DG |
678 | |
679 | close(kernel_poll_pipe[0]); | |
680 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
681 | return NULL; |
682 | } | |
683 | ||
1d4b027a | 684 | /* |
d063d709 | 685 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
686 | */ |
687 | static void *thread_manage_kconsumerd(void *data) | |
688 | { | |
273ea72c | 689 | int sock = 0, ret; |
1d4b027a | 690 | enum lttcomm_return_code code; |
273ea72c | 691 | struct pollfd pollfd[2]; |
1d4b027a DG |
692 | |
693 | DBG("[thread] Manage kconsumerd started"); | |
694 | ||
695 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
696 | if (ret < 0) { | |
697 | goto error; | |
698 | } | |
699 | ||
273ea72c DG |
700 | /* First fd is always the quit pipe */ |
701 | pollfd[0].fd = thread_quit_pipe[0]; | |
702 | ||
703 | /* Apps socket */ | |
704 | pollfd[1].fd = kconsumerd_err_sock; | |
705 | pollfd[1].events = POLLIN; | |
706 | ||
707 | /* Inifinite blocking call, waiting for transmission */ | |
708 | ret = poll(pollfd, 2, -1); | |
709 | if (ret < 0) { | |
710 | perror("poll kconsumerd thread"); | |
711 | goto error; | |
712 | } | |
713 | ||
714 | /* Thread quit pipe has been closed. Killing thread. */ | |
715 | if (pollfd[0].revents == POLLNVAL) { | |
716 | goto error; | |
717 | } else if (pollfd[1].revents == POLLERR) { | |
718 | ERR("Kconsumerd err socket poll error"); | |
719 | goto error; | |
720 | } | |
721 | ||
1d4b027a DG |
722 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
723 | if (sock < 0) { | |
724 | goto error; | |
725 | } | |
726 | ||
712ea556 | 727 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
728 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
729 | if (ret <= 0) { | |
730 | goto error; | |
731 | } | |
732 | ||
733 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
734 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
735 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 736 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
737 | perror("kconsumerd connect"); |
738 | goto error; | |
739 | } | |
740 | /* Signal condition to tell that the kconsumerd is ready */ | |
741 | sem_post(&kconsumerd_sem); | |
742 | DBG("Kconsumerd command socket ready"); | |
743 | } else { | |
6f61d021 | 744 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
745 | lttcomm_get_readable_code(-code)); |
746 | goto error; | |
747 | } | |
748 | ||
72079cae DG |
749 | /* Kconsumerd err socket */ |
750 | pollfd[1].fd = sock; | |
751 | pollfd[1].events = POLLIN; | |
752 | ||
753 | /* Inifinite blocking call, waiting for transmission */ | |
754 | ret = poll(pollfd, 2, -1); | |
755 | if (ret < 0) { | |
756 | perror("poll kconsumerd thread"); | |
757 | goto error; | |
758 | } | |
759 | ||
760 | /* Thread quit pipe has been closed. Killing thread. */ | |
761 | if (pollfd[0].revents == POLLNVAL) { | |
762 | goto error; | |
763 | } else if (pollfd[1].revents == POLLERR) { | |
764 | ERR("Kconsumerd err socket second poll error"); | |
765 | goto error; | |
766 | } | |
767 | ||
712ea556 DG |
768 | /* Wait for any kconsumerd error */ |
769 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
770 | if (ret <= 0) { | |
771 | ERR("Kconsumerd closed the command socket"); | |
772 | goto error; | |
6f61d021 | 773 | } |
1d4b027a | 774 | |
712ea556 DG |
775 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
776 | ||
1d4b027a | 777 | error: |
6f61d021 | 778 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
779 | if (kconsumerd_err_sock) { |
780 | close(kconsumerd_err_sock); | |
781 | } | |
782 | if (kconsumerd_cmd_sock) { | |
783 | close(kconsumerd_cmd_sock); | |
784 | } | |
785 | if (sock) { | |
786 | close(sock); | |
787 | } | |
788 | ||
789 | unlink(kconsumerd_err_unix_sock_path); | |
790 | unlink(kconsumerd_cmd_unix_sock_path); | |
791 | ||
792 | kconsumerd_pid = 0; | |
1d4b027a DG |
793 | return NULL; |
794 | } | |
795 | ||
796 | /* | |
1d4b027a DG |
797 | * This thread manage the application socket communication |
798 | */ | |
799 | static void *thread_manage_apps(void *data) | |
800 | { | |
273ea72c DG |
801 | int sock = 0, ret; |
802 | struct pollfd pollfd[2]; | |
1d4b027a DG |
803 | |
804 | /* TODO: Something more elegant is needed but fine for now */ | |
805 | /* FIXME: change all types to either uint8_t, uint32_t, uint64_t | |
806 | * for 32-bit vs 64-bit compat processes. */ | |
807 | /* replicate in ust with version number */ | |
808 | struct { | |
809 | int reg; /* 1:register, 0:unregister */ | |
810 | pid_t pid; | |
811 | uid_t uid; | |
812 | } reg_msg; | |
813 | ||
814 | DBG("[thread] Manage apps started"); | |
815 | ||
816 | ret = lttcomm_listen_unix_sock(apps_sock); | |
817 | if (ret < 0) { | |
818 | goto error; | |
819 | } | |
820 | ||
273ea72c DG |
821 | /* First fd is always the quit pipe */ |
822 | pollfd[0].fd = thread_quit_pipe[0]; | |
823 | ||
824 | /* Apps socket */ | |
825 | pollfd[1].fd = apps_sock; | |
826 | pollfd[1].events = POLLIN; | |
827 | ||
1d4b027a DG |
828 | /* Notify all applications to register */ |
829 | notify_apps(default_global_apps_pipe); | |
830 | ||
831 | while (1) { | |
832 | DBG("Accepting application registration"); | |
273ea72c DG |
833 | |
834 | /* Inifinite blocking call, waiting for transmission */ | |
835 | ret = poll(pollfd, 2, -1); | |
836 | if (ret < 0) { | |
837 | perror("poll apps thread"); | |
838 | goto error; | |
839 | } | |
840 | ||
841 | /* Thread quit pipe has been closed. Killing thread. */ | |
842 | if (pollfd[0].revents == POLLNVAL) { | |
843 | goto error; | |
844 | } else if (pollfd[1].revents == POLLERR) { | |
845 | ERR("Apps socket poll error"); | |
846 | goto error; | |
847 | } | |
848 | ||
1d4b027a DG |
849 | sock = lttcomm_accept_unix_sock(apps_sock); |
850 | if (sock < 0) { | |
851 | goto error; | |
852 | } | |
853 | ||
273ea72c | 854 | /* |
809dc281 MD |
855 | * Using message-based transmissions to ensure we don't |
856 | * have to deal with partially received messages. | |
1d4b027a | 857 | */ |
809dc281 | 858 | ret = lttcomm_recv_unix_sock(sock, ®_msg, sizeof(reg_msg)); |
1d4b027a DG |
859 | if (ret < 0) { |
860 | perror("recv"); | |
861 | continue; | |
862 | } | |
863 | ||
864 | /* Add application to the global traceable list */ | |
865 | if (reg_msg.reg == 1) { | |
866 | /* Registering */ | |
809dc281 MD |
867 | /* |
868 | * TODO: socket should be either passed to a | |
869 | * listener thread (for more messages) or | |
870 | * closed. It currently leaks. | |
871 | */ | |
1d4b027a DG |
872 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); |
873 | if (ret < 0) { | |
874 | /* register_traceable_app only return an error with | |
875 | * ENOMEM. At this point, we better stop everything. | |
876 | */ | |
877 | goto error; | |
878 | } | |
879 | } else { | |
880 | /* Unregistering */ | |
881 | unregister_traceable_app(reg_msg.pid); | |
882 | } | |
883 | } | |
884 | ||
885 | error: | |
273ea72c DG |
886 | DBG("Apps thread dying"); |
887 | if (apps_sock) { | |
888 | close(apps_sock); | |
889 | } | |
890 | if (sock) { | |
891 | close(sock); | |
892 | } | |
1d4b027a | 893 | |
273ea72c | 894 | unlink(apps_unix_sock_path); |
1d4b027a DG |
895 | return NULL; |
896 | } | |
897 | ||
8c0faa1d | 898 | /* |
d063d709 DG |
899 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
900 | * exec or it will fails. | |
8c0faa1d | 901 | */ |
693bd40b | 902 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
903 | { |
904 | int ret; | |
905 | ||
906 | /* Setup semaphore */ | |
907 | sem_init(&kconsumerd_sem, 0, 0); | |
908 | ||
1d4b027a | 909 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
910 | if (ret != 0) { |
911 | perror("pthread_create kconsumerd"); | |
912 | goto error; | |
913 | } | |
914 | ||
693bd40b | 915 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
916 | sem_wait(&kconsumerd_sem); |
917 | ||
712ea556 DG |
918 | if (kconsumerd_pid == 0) { |
919 | ERR("Kconsumerd did not start"); | |
920 | goto error; | |
921 | } | |
922 | ||
8c0faa1d DG |
923 | return 0; |
924 | ||
925 | error: | |
712ea556 | 926 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
927 | return ret; |
928 | } | |
929 | ||
d9800920 DG |
930 | /* |
931 | * Join kernel consumer thread | |
932 | */ | |
cf3af59e MD |
933 | static int join_kconsumerd_thread(void) |
934 | { | |
935 | void *status; | |
936 | int ret; | |
937 | ||
938 | if (kconsumerd_pid != 0) { | |
939 | ret = kill(kconsumerd_pid, SIGTERM); | |
940 | if (ret) { | |
941 | ERR("Error killing kconsumerd"); | |
942 | return ret; | |
943 | } | |
944 | return pthread_join(kconsumerd_thread, &status); | |
945 | } else { | |
946 | return 0; | |
947 | } | |
948 | } | |
949 | ||
8c0faa1d | 950 | /* |
d063d709 | 951 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 952 | * |
d063d709 | 953 | * Return pid if successful else -1. |
8c0faa1d | 954 | */ |
693bd40b | 955 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
956 | { |
957 | int ret; | |
958 | pid_t pid; | |
53086306 | 959 | const char *verbosity; |
8c0faa1d | 960 | |
c49dc785 DG |
961 | DBG("Spawning kconsumerd"); |
962 | ||
8c0faa1d DG |
963 | pid = fork(); |
964 | if (pid == 0) { | |
965 | /* | |
966 | * Exec kconsumerd. | |
967 | */ | |
31f73cc9 | 968 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
969 | verbosity = "--verbose"; |
970 | } else { | |
971 | verbosity = "--quiet"; | |
972 | } | |
973 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
974 | if (errno != 0) { |
975 | perror("kernel start consumer exec"); | |
976 | } | |
977 | exit(EXIT_FAILURE); | |
978 | } else if (pid > 0) { | |
979 | ret = pid; | |
980 | goto error; | |
981 | } else { | |
982 | perror("kernel start consumer fork"); | |
983 | ret = -errno; | |
984 | goto error; | |
985 | } | |
986 | ||
987 | error: | |
988 | return ret; | |
989 | } | |
990 | ||
693bd40b | 991 | /* |
d063d709 | 992 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
993 | */ |
994 | static int start_kconsumerd(void) | |
995 | { | |
996 | int ret; | |
997 | ||
693bd40b | 998 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 999 | if (kconsumerd_pid != 0) { |
817153bb | 1000 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1001 | goto end; |
1002 | } | |
693bd40b | 1003 | |
c49dc785 DG |
1004 | ret = spawn_kconsumerd(); |
1005 | if (ret < 0) { | |
1006 | ERR("Spawning kconsumerd failed"); | |
1007 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1008 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1009 | goto error; | |
693bd40b | 1010 | } |
c49dc785 DG |
1011 | |
1012 | /* Setting up the global kconsumerd_pid */ | |
1013 | kconsumerd_pid = ret; | |
693bd40b DG |
1014 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1015 | ||
6f61d021 DG |
1016 | DBG("Kconsumerd pid %d", ret); |
1017 | ||
693bd40b | 1018 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1019 | ret = spawn_kconsumerd_thread(); |
1020 | if (ret < 0) { | |
1021 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1022 | goto error; |
1023 | } | |
1024 | ||
c49dc785 | 1025 | end: |
693bd40b DG |
1026 | return 0; |
1027 | ||
1028 | error: | |
1029 | return ret; | |
1030 | } | |
1031 | ||
b73401da | 1032 | /* |
d063d709 | 1033 | * modprobe_kernel_modules |
b73401da DG |
1034 | */ |
1035 | static int modprobe_kernel_modules(void) | |
1036 | { | |
ab147185 | 1037 | int ret = 0, i; |
b73401da DG |
1038 | char modprobe[256]; |
1039 | ||
ab147185 MD |
1040 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1041 | ret = snprintf(modprobe, sizeof(modprobe), | |
1042 | "/sbin/modprobe %s%s", | |
1043 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1044 | kernel_modules_list[i].name); | |
b73401da DG |
1045 | if (ret < 0) { |
1046 | perror("snprintf modprobe"); | |
1047 | goto error; | |
1048 | } | |
ab147185 | 1049 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1050 | ret = system(modprobe); |
ab147185 MD |
1051 | if (ret == -1) { |
1052 | ERR("Unable to launch modprobe for module %s", | |
1053 | kernel_modules_list[i].name); | |
1054 | } else if (kernel_modules_list[i].required | |
d9800920 | 1055 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1056 | ERR("Unable to load module %s", |
1057 | kernel_modules_list[i].name); | |
1058 | } else { | |
1059 | DBG("Modprobe successfully %s", | |
1060 | kernel_modules_list[i].name); | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | error: | |
1065 | return ret; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * modprobe_remove_kernel_modules | |
1070 | * Remove modules in reverse load order. | |
1071 | */ | |
1072 | static int modprobe_remove_kernel_modules(void) | |
1073 | { | |
1074 | int ret = 0, i; | |
1075 | char modprobe[256]; | |
1076 | ||
1077 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
1078 | ret = snprintf(modprobe, sizeof(modprobe), | |
1079 | "/sbin/modprobe --remove --quiet %s", | |
1080 | kernel_modules_list[i].name); | |
b73401da | 1081 | if (ret < 0) { |
ab147185 MD |
1082 | perror("snprintf modprobe --remove"); |
1083 | goto error; | |
1084 | } | |
1085 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
1086 | ret = system(modprobe); | |
1087 | if (ret == -1) { | |
1088 | ERR("Unable to launch modprobe --remove for module %s", | |
1089 | kernel_modules_list[i].name); | |
1090 | } else if (kernel_modules_list[i].required | |
d9800920 | 1091 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1092 | ERR("Unable to remove module %s", |
1093 | kernel_modules_list[i].name); | |
1094 | } else { | |
1095 | DBG("Modprobe removal successful %s", | |
1096 | kernel_modules_list[i].name); | |
b73401da | 1097 | } |
b73401da DG |
1098 | } |
1099 | ||
1100 | error: | |
1101 | return ret; | |
1102 | } | |
1103 | ||
1104 | /* | |
d063d709 | 1105 | * mount_debugfs |
b73401da DG |
1106 | */ |
1107 | static int mount_debugfs(char *path) | |
1108 | { | |
1109 | int ret; | |
1110 | char *type = "debugfs"; | |
1111 | ||
996b65c8 | 1112 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1113 | if (ret < 0) { |
1114 | goto error; | |
1115 | } | |
1116 | ||
1117 | ret = mount(type, path, type, 0, NULL); | |
1118 | if (ret < 0) { | |
1119 | perror("mount debugfs"); | |
1120 | goto error; | |
1121 | } | |
1122 | ||
1123 | DBG("Mounted debugfs successfully at %s", path); | |
1124 | ||
1125 | error: | |
1126 | return ret; | |
1127 | } | |
1128 | ||
8c0faa1d | 1129 | /* |
d063d709 | 1130 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1131 | */ |
f3ed775e | 1132 | static void init_kernel_tracer(void) |
8c0faa1d | 1133 | { |
b73401da DG |
1134 | int ret; |
1135 | char *proc_mounts = "/proc/mounts"; | |
1136 | char line[256]; | |
1137 | char *debugfs_path = NULL, *lttng_path; | |
1138 | FILE *fp; | |
1139 | ||
1140 | /* Detect debugfs */ | |
1141 | fp = fopen(proc_mounts, "r"); | |
1142 | if (fp == NULL) { | |
1143 | ERR("Unable to probe %s", proc_mounts); | |
1144 | goto error; | |
1145 | } | |
1146 | ||
1147 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1148 | if (strstr(line, "debugfs") != NULL) { | |
1149 | /* Remove first string */ | |
1150 | strtok(line, " "); | |
1151 | /* Dup string here so we can reuse line later on */ | |
1152 | debugfs_path = strdup(strtok(NULL, " ")); | |
1153 | DBG("Got debugfs path : %s", debugfs_path); | |
1154 | break; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | fclose(fp); | |
1159 | ||
1160 | /* Mount debugfs if needded */ | |
1161 | if (debugfs_path == NULL) { | |
1162 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1163 | if (ret < 0) { | |
1164 | perror("asprintf debugfs path"); | |
1165 | goto error; | |
1166 | } | |
1167 | ret = mount_debugfs(debugfs_path); | |
1168 | if (ret < 0) { | |
1169 | goto error; | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | /* Modprobe lttng kernel modules */ | |
1174 | ret = modprobe_kernel_modules(); | |
1175 | if (ret < 0) { | |
1176 | goto error; | |
1177 | } | |
1178 | ||
1179 | /* Setup lttng kernel path */ | |
1180 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1181 | if (ret < 0) { | |
1182 | perror("asprintf lttng path"); | |
1183 | goto error; | |
1184 | } | |
1185 | ||
1186 | /* Open debugfs lttng */ | |
1187 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1188 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1189 | DBG("Failed to open %s", lttng_path); |
1190 | goto error; | |
8c0faa1d DG |
1191 | } |
1192 | ||
b73401da DG |
1193 | free(lttng_path); |
1194 | free(debugfs_path); | |
f3ed775e | 1195 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1196 | return; |
1197 | ||
1198 | error: | |
1199 | if (lttng_path) { | |
1200 | free(lttng_path); | |
1201 | } | |
1202 | if (debugfs_path) { | |
1203 | free(debugfs_path); | |
1204 | } | |
1205 | WARN("No kernel tracer available"); | |
1206 | kernel_tracer_fd = 0; | |
1207 | return; | |
f3ed775e | 1208 | } |
33a2b854 | 1209 | |
f3ed775e | 1210 | /* |
d063d709 DG |
1211 | * Start tracing by creating trace directory and sending FDs to the kernel |
1212 | * consumer. | |
f3ed775e DG |
1213 | */ |
1214 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1215 | { | |
f40799e8 | 1216 | int ret = 0; |
8c0faa1d | 1217 | |
f3ed775e | 1218 | if (session->kconsumer_fds_sent == 0) { |
d9800920 DG |
1219 | /* |
1220 | * Assign default kernel consumer if no consumer assigned to the kernel | |
1221 | * session. At this point, it's NOT suppose to be 0 but this is an extra | |
1222 | * security check. | |
1223 | */ | |
1224 | if (session->consumer_fd == 0) { | |
1225 | session->consumer_fd = kconsumerd_cmd_sock; | |
1226 | } | |
1227 | ||
1228 | ret = send_kconsumerd_fds(session); | |
f3ed775e DG |
1229 | if (ret < 0) { |
1230 | ERR("Send kconsumerd fds failed"); | |
1231 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1232 | goto error; | |
1233 | } | |
1d4b027a | 1234 | |
f3ed775e DG |
1235 | session->kconsumer_fds_sent = 1; |
1236 | } | |
1d4b027a DG |
1237 | |
1238 | error: | |
1239 | return ret; | |
8c0faa1d DG |
1240 | } |
1241 | ||
7a485870 DG |
1242 | /* |
1243 | * Notify kernel thread to update it's pollfd. | |
1244 | */ | |
1245 | static int notify_kernel_pollfd(void) | |
1246 | { | |
1247 | int ret; | |
1248 | ||
1249 | /* Inform kernel thread of the new kernel channel */ | |
1250 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1251 | if (ret < 0) { | |
1252 | perror("write kernel poll pipe"); | |
1253 | } | |
1254 | ||
1255 | return ret; | |
1256 | } | |
1257 | ||
8c0faa1d | 1258 | /* |
d063d709 | 1259 | * Allocate a channel structure and fill it. |
8c0faa1d | 1260 | */ |
b389abbe MD |
1261 | static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type, |
1262 | char *name) | |
8c0faa1d | 1263 | { |
f3ed775e | 1264 | struct lttng_channel *chan; |
1d4b027a | 1265 | |
f3ed775e DG |
1266 | chan = malloc(sizeof(struct lttng_channel)); |
1267 | if (chan == NULL) { | |
1268 | perror("init channel malloc"); | |
1269 | goto error; | |
8c0faa1d | 1270 | } |
1d4b027a | 1271 | |
ed8f384d | 1272 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1273 | perror("snprintf channel name"); |
b389abbe | 1274 | goto error; |
f3ed775e DG |
1275 | } |
1276 | ||
1277 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
f3ed775e DG |
1278 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
1279 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1d4b027a | 1280 | |
b389abbe MD |
1281 | switch (domain_type) { |
1282 | case LTTNG_DOMAIN_KERNEL: | |
1283 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
1284 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
1285 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1286 | break; | |
1287 | /* TODO: add UST */ | |
1288 | default: | |
1289 | goto error; /* Not implemented */ | |
1290 | } | |
1291 | ||
f3ed775e | 1292 | return chan; |
b389abbe MD |
1293 | |
1294 | error: | |
1295 | free(chan); | |
1296 | return NULL; | |
8c0faa1d DG |
1297 | } |
1298 | ||
333f285e | 1299 | /* |
d063d709 | 1300 | * Create a kernel tracer session then create the default channel. |
333f285e | 1301 | */ |
f3ed775e | 1302 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1303 | { |
f3ed775e | 1304 | int ret; |
f3ed775e DG |
1305 | |
1306 | DBG("Creating kernel session"); | |
1307 | ||
1308 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1309 | if (ret < 0) { | |
1310 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1311 | goto error; | |
333f285e DG |
1312 | } |
1313 | ||
d9800920 DG |
1314 | /* Set kernel consumer socket fd */ |
1315 | if (kconsumerd_cmd_sock) { | |
1316 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1317 | } | |
1318 | ||
63053e7c DG |
1319 | ret = asprintf(&session->kernel_session->trace_path, "%s/kernel", |
1320 | session->path); | |
1321 | if (ret < 0) { | |
1322 | perror("asprintf kernel traces path"); | |
1323 | goto error; | |
1324 | } | |
1325 | ||
1326 | ret = mkdir_recursive(session->kernel_session->trace_path, | |
1327 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1328 | if (ret < 0) { |
996b65c8 | 1329 | if (ret != -EEXIST) { |
7a485870 DG |
1330 | ERR("Trace directory creation error"); |
1331 | goto error; | |
1332 | } | |
1333 | } | |
1334 | ||
f3ed775e DG |
1335 | error: |
1336 | return ret; | |
333f285e DG |
1337 | } |
1338 | ||
6c9cc2ab DG |
1339 | /* |
1340 | * Using the session list, filled a lttng_session array to send back to the | |
1341 | * client for session listing. | |
1342 | * | |
1343 | * The session list lock MUST be acquired before calling this function. Use | |
1344 | * lock_session_list() and unlock_session_list(). | |
1345 | */ | |
1346 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1347 | { | |
1348 | int i = 0; | |
1349 | struct ltt_session *session; | |
1350 | ||
1351 | DBG("Getting all available session"); | |
1352 | /* | |
1353 | * Iterate over session list and append data after the control struct in | |
1354 | * the buffer. | |
1355 | */ | |
1356 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1357 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1358 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1359 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1360 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1361 | i++; |
1362 | } | |
1363 | } | |
1364 | ||
9f19cc17 DG |
1365 | /* |
1366 | * Fill lttng_channel array of all channels. | |
1367 | */ | |
1368 | static void list_lttng_channels(struct ltt_session *session, | |
1369 | struct lttng_channel *channels) | |
1370 | { | |
1371 | int i = 0; | |
1372 | struct ltt_kernel_channel *kchan; | |
1373 | ||
1374 | DBG("Listing channels for session %s", session->name); | |
1375 | ||
1376 | /* Kernel channels */ | |
1377 | if (session->kernel_session != NULL) { | |
1378 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1379 | /* Copy lttng_channel struct to array */ | |
1380 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1381 | channels[i].enabled = kchan->enabled; | |
1382 | i++; | |
1383 | } | |
1384 | } | |
1385 | ||
1386 | /* TODO: Missing UST listing */ | |
1387 | } | |
1388 | ||
1389 | /* | |
1390 | * Fill lttng_event array of all events in the channel. | |
1391 | */ | |
1392 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1393 | struct lttng_event *events) | |
1394 | { | |
1395 | /* | |
1396 | * TODO: This is ONLY kernel. Need UST support. | |
1397 | */ | |
1398 | int i = 0; | |
1399 | struct ltt_kernel_event *event; | |
1400 | ||
1401 | DBG("Listing events for channel %s", kchan->channel->name); | |
1402 | ||
1403 | /* Kernel channels */ | |
1404 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1405 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1406 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1407 | events[i].enabled = event->enabled; |
1408 | switch (event->event->instrumentation) { | |
1409 | case LTTNG_KERNEL_TRACEPOINT: | |
1410 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1411 | break; | |
1412 | case LTTNG_KERNEL_KPROBE: | |
1413 | case LTTNG_KERNEL_KRETPROBE: | |
1414 | events[i].type = LTTNG_EVENT_PROBE; | |
1415 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1416 | sizeof(struct lttng_kernel_kprobe)); | |
1417 | break; | |
1418 | case LTTNG_KERNEL_FUNCTION: | |
1419 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1420 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1421 | sizeof(struct lttng_kernel_function)); | |
1422 | break; | |
1423 | } | |
1424 | i++; | |
1425 | } | |
1426 | } | |
1427 | ||
fac6795d | 1428 | /* |
d063d709 DG |
1429 | * Process the command requested by the lttng client within the command |
1430 | * context structure. This function make sure that the return structure (llm) | |
1431 | * is set and ready for transmission before returning. | |
fac6795d | 1432 | * |
e065084a | 1433 | * Return any error encountered or 0 for success. |
fac6795d | 1434 | */ |
5461b305 | 1435 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1436 | { |
f40799e8 | 1437 | int ret = LTTCOMM_OK; |
fac6795d | 1438 | |
5461b305 | 1439 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1440 | |
63053e7c DG |
1441 | /* |
1442 | * Commands that DO NOT need a session. | |
1443 | */ | |
5461b305 | 1444 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1445 | case LTTNG_CREATE_SESSION: |
1446 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1447 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1448 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1449 | break; |
1450 | default: | |
42abccdb DG |
1451 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1452 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1453 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1454 | /* If session name not found */ |
42abccdb | 1455 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1456 | ret = LTTCOMM_SESS_NOT_FOUND; |
1457 | } else { /* If no session name specified */ | |
1458 | ret = LTTCOMM_SELECT_SESS; | |
1459 | } | |
5461b305 | 1460 | goto error; |
b5541356 DG |
1461 | } else { |
1462 | /* Acquire lock for the session */ | |
1463 | lock_session(cmd_ctx->session); | |
379473d2 | 1464 | } |
5e16da05 | 1465 | break; |
379473d2 DG |
1466 | } |
1467 | ||
f3ed775e | 1468 | /* |
d0254c7c | 1469 | * Check domain type for specific "pre-action". |
f3ed775e | 1470 | */ |
0d0c377a DG |
1471 | switch (cmd_ctx->lsm->domain.type) { |
1472 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1473 | /* Kernel tracer check */ |
20fe2104 | 1474 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1475 | init_kernel_tracer(); |
1476 | if (kernel_tracer_fd == 0) { | |
1477 | ret = LTTCOMM_KERN_NA; | |
1478 | goto error; | |
1479 | } | |
20fe2104 | 1480 | } |
f3ed775e DG |
1481 | |
1482 | /* Need a session for kernel command */ | |
d0254c7c | 1483 | switch (cmd_ctx->lsm->cmd_type) { |
d9800920 | 1484 | case LTTNG_CALIBRATE: |
d0254c7c MD |
1485 | case LTTNG_CREATE_SESSION: |
1486 | case LTTNG_LIST_SESSIONS: | |
1487 | case LTTNG_LIST_TRACEPOINTS: | |
d0254c7c MD |
1488 | break; |
1489 | default: | |
1490 | if (cmd_ctx->session->kernel_session == NULL) { | |
1491 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1492 | if (ret < 0) { |
d0254c7c | 1493 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1494 | goto error; |
1495 | } | |
d0254c7c MD |
1496 | |
1497 | /* Start the kernel consumer daemon */ | |
d9800920 DG |
1498 | |
1499 | if (kconsumerd_pid == 0 && | |
1500 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
d0254c7c MD |
1501 | ret = start_kconsumerd(); |
1502 | if (ret < 0) { | |
1503 | goto error; | |
1504 | } | |
1505 | } | |
f3ed775e DG |
1506 | } |
1507 | } | |
0d0c377a DG |
1508 | break; |
1509 | default: | |
1510 | break; | |
20fe2104 DG |
1511 | } |
1512 | ||
fac6795d | 1513 | /* Process by command type */ |
5461b305 | 1514 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1515 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1516 | { |
b579acd9 | 1517 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1518 | |
1519 | /* Setup lttng message with no payload */ | |
1520 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1521 | if (ret < 0) { | |
1522 | goto setup_error; | |
1523 | } | |
1524 | ||
b579acd9 DG |
1525 | switch (cmd_ctx->lsm->domain.type) { |
1526 | case LTTNG_DOMAIN_KERNEL: | |
1527 | /* Create Kernel context */ | |
1528 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1529 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1530 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1531 | strncpy(kctx.u.perf_counter.name, | |
1532 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1533 | LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1534 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
b579acd9 DG |
1535 | |
1536 | /* Add kernel context to kernel tracer. See context.c */ | |
1537 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1538 | cmd_ctx->lsm->u.context.event_name, | |
1539 | cmd_ctx->lsm->u.context.channel_name); | |
1540 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1541 | goto error; |
1542 | } | |
b579acd9 DG |
1543 | break; |
1544 | default: | |
1545 | /* TODO: Userspace tracing */ | |
1546 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1547 | goto error; |
d65106b1 DG |
1548 | } |
1549 | ||
1550 | ret = LTTCOMM_OK; | |
1551 | break; | |
1552 | } | |
0b97ec54 | 1553 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1554 | { |
0b97ec54 | 1555 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1556 | |
1557 | /* Setup lttng message with no payload */ | |
1558 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1559 | if (ret < 0) { | |
1560 | goto setup_error; | |
1561 | } | |
1562 | ||
0b97ec54 DG |
1563 | switch (cmd_ctx->lsm->domain.type) { |
1564 | case LTTNG_DOMAIN_KERNEL: | |
1565 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1566 | cmd_ctx->session->kernel_session); | |
1567 | if (kchan == NULL) { | |
1568 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1569 | goto error; |
0b97ec54 DG |
1570 | } else if (kchan->enabled == 1) { |
1571 | ret = kernel_disable_channel(kchan); | |
1572 | if (ret < 0) { | |
1573 | if (ret != EEXIST) { | |
1574 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1575 | } | |
1576 | goto error; | |
1577 | } | |
26cc6b4e | 1578 | } |
0b97ec54 DG |
1579 | kernel_wait_quiescent(kernel_tracer_fd); |
1580 | break; | |
1581 | default: | |
1582 | /* TODO: Userspace tracing */ | |
1583 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1584 | goto error; | |
26cc6b4e DG |
1585 | } |
1586 | ||
26cc6b4e DG |
1587 | ret = LTTCOMM_OK; |
1588 | break; | |
1589 | } | |
f5177a38 | 1590 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1591 | { |
f5177a38 DG |
1592 | struct ltt_kernel_channel *kchan; |
1593 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1594 | |
1595 | /* Setup lttng message with no payload */ | |
1596 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1597 | if (ret < 0) { | |
1598 | goto setup_error; | |
1599 | } | |
1600 | ||
f5177a38 DG |
1601 | switch (cmd_ctx->lsm->domain.type) { |
1602 | case LTTNG_DOMAIN_KERNEL: | |
1603 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1604 | cmd_ctx->session->kernel_session); | |
1605 | if (kchan == NULL) { | |
1606 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1607 | goto error; |
e953ef25 | 1608 | } |
f5177a38 DG |
1609 | |
1610 | kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); | |
1611 | if (kevent != NULL) { | |
1612 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1613 | kchan->channel->name); | |
1614 | ret = kernel_disable_event(kevent); | |
1615 | if (ret < 0) { | |
1616 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1617 | goto error; | |
1618 | } | |
1619 | } | |
1620 | ||
1621 | kernel_wait_quiescent(kernel_tracer_fd); | |
1622 | break; | |
1623 | default: | |
1624 | /* TODO: Userspace tracing */ | |
1625 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1626 | goto error; | |
e953ef25 DG |
1627 | } |
1628 | ||
19e70852 | 1629 | ret = LTTCOMM_OK; |
e953ef25 DG |
1630 | break; |
1631 | } | |
f5177a38 | 1632 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1633 | { |
f5177a38 DG |
1634 | struct ltt_kernel_channel *kchan; |
1635 | struct ltt_kernel_event *kevent; | |
950131af DG |
1636 | |
1637 | /* Setup lttng message with no payload */ | |
1638 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1639 | if (ret < 0) { | |
1640 | goto setup_error; | |
1641 | } | |
1642 | ||
f5177a38 DG |
1643 | switch (cmd_ctx->lsm->domain.type) { |
1644 | case LTTNG_DOMAIN_KERNEL: | |
1645 | DBG("Disabling all enabled kernel events"); | |
1646 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, | |
1647 | cmd_ctx->session->kernel_session); | |
1648 | if (kchan == NULL) { | |
1649 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1650 | goto error; | |
1651 | } | |
950131af | 1652 | |
f5177a38 DG |
1653 | /* For each event in the kernel session */ |
1654 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1655 | DBG("Disabling kernel event %s for channel %s.", | |
1656 | kevent->event->name, kchan->channel->name); | |
1657 | ret = kernel_disable_event(kevent); | |
1658 | if (ret < 0) { | |
1659 | continue; | |
1660 | } | |
950131af | 1661 | } |
f5177a38 DG |
1662 | |
1663 | /* Quiescent wait after event disable */ | |
1664 | kernel_wait_quiescent(kernel_tracer_fd); | |
1665 | break; | |
1666 | default: | |
1667 | /* TODO: Userspace tracing */ | |
1668 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1669 | goto error; | |
950131af DG |
1670 | } |
1671 | ||
950131af DG |
1672 | ret = LTTCOMM_OK; |
1673 | break; | |
1674 | } | |
0d0c377a | 1675 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 1676 | { |
0d0c377a | 1677 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
1678 | |
1679 | /* Setup lttng message with no payload */ | |
1680 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1681 | if (ret < 0) { | |
1682 | goto setup_error; | |
1683 | } | |
1684 | ||
0d0c377a DG |
1685 | switch (cmd_ctx->lsm->domain.type) { |
1686 | case LTTNG_DOMAIN_KERNEL: | |
1687 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, | |
1688 | cmd_ctx->session->kernel_session); | |
1689 | if (kchan == NULL) { | |
1690 | /* Channel not found, creating it */ | |
1691 | DBG("Creating kernel channel"); | |
7d29a247 | 1692 | |
0d0c377a | 1693 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c DG |
1694 | &cmd_ctx->lsm->u.channel.chan, |
1695 | cmd_ctx->session->kernel_session->trace_path); | |
0d0c377a DG |
1696 | if (ret < 0) { |
1697 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1698 | goto error; | |
1699 | } | |
7d29a247 | 1700 | |
0d0c377a DG |
1701 | /* Notify kernel thread that there is a new channel */ |
1702 | ret = notify_kernel_pollfd(); | |
1703 | if (ret < 0) { | |
1704 | ret = LTTCOMM_FATAL; | |
1705 | goto error; | |
1706 | } | |
1707 | } else if (kchan->enabled == 0) { | |
1708 | ret = kernel_enable_channel(kchan); | |
1709 | if (ret < 0) { | |
1710 | if (ret != EEXIST) { | |
1711 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
1712 | } | |
1713 | goto error; | |
d36b8583 | 1714 | } |
d36b8583 | 1715 | } |
0d0c377a DG |
1716 | |
1717 | kernel_wait_quiescent(kernel_tracer_fd); | |
1718 | break; | |
1719 | default: | |
1720 | /* TODO: Userspace tracing */ | |
1721 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1722 | goto error; | |
d36b8583 DG |
1723 | } |
1724 | ||
d36b8583 DG |
1725 | ret = LTTCOMM_OK; |
1726 | break; | |
1727 | } | |
0d0c377a | 1728 | case LTTNG_ENABLE_EVENT: |
894be886 | 1729 | { |
7d29a247 DG |
1730 | char *channel_name; |
1731 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 1732 | struct ltt_kernel_event *kevent; |
7d29a247 | 1733 | struct lttng_channel *chan; |
f3ed775e | 1734 | |
894be886 DG |
1735 | /* Setup lttng message with no payload */ |
1736 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1737 | if (ret < 0) { | |
1738 | goto setup_error; | |
1739 | } | |
1740 | ||
7d29a247 DG |
1741 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1742 | ||
0d0c377a DG |
1743 | switch (cmd_ctx->lsm->domain.type) { |
1744 | case LTTNG_DOMAIN_KERNEL: | |
b389abbe MD |
1745 | kchan = get_kernel_channel_by_name(channel_name, |
1746 | cmd_ctx->session->kernel_session); | |
1747 | if (kchan == NULL) { | |
1748 | DBG("Channel not found. Creating channel %s", channel_name); | |
1749 | ||
1750 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
1751 | if (chan == NULL) { | |
1752 | ret = LTTCOMM_FATAL; | |
1753 | goto error; | |
1754 | } | |
1755 | ||
1756 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
1757 | chan, cmd_ctx->session->kernel_session->trace_path); | |
1758 | if (ret < 0) { | |
1759 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1760 | goto error; | |
1761 | } | |
0d0c377a DG |
1762 | kchan = get_kernel_channel_by_name(channel_name, |
1763 | cmd_ctx->session->kernel_session); | |
1764 | if (kchan == NULL) { | |
b389abbe MD |
1765 | ERR("Channel %s not found after creation. Internal error, giving up.", |
1766 | channel_name); | |
1767 | ret = LTTCOMM_FATAL; | |
1768 | goto error; | |
7d29a247 | 1769 | } |
b389abbe | 1770 | } |
7d29a247 | 1771 | |
0d0c377a DG |
1772 | kevent = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
1773 | if (kevent == NULL) { | |
1774 | DBG("Creating kernel event %s for channel %s.", | |
1775 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
1776 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
1777 | } else { | |
1778 | DBG("Enabling kernel event %s for channel %s.", | |
1779 | kevent->event->name, channel_name); | |
1780 | ret = kernel_enable_event(kevent); | |
1781 | if (ret == -EEXIST) { | |
1782 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
1783 | goto error; |
1784 | } | |
1785 | } | |
f34daff7 | 1786 | |
0d0c377a DG |
1787 | if (ret < 0) { |
1788 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
1789 | goto error; |
1790 | } | |
19e70852 | 1791 | |
0d0c377a DG |
1792 | kernel_wait_quiescent(kernel_tracer_fd); |
1793 | break; | |
1794 | default: | |
1795 | /* TODO: Userspace tracing */ | |
1796 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 1797 | goto error; |
f3ed775e | 1798 | } |
19e70852 | 1799 | ret = LTTCOMM_OK; |
894be886 DG |
1800 | break; |
1801 | } | |
0d0c377a | 1802 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 1803 | { |
9f19cc17 DG |
1804 | int size, i; |
1805 | char *channel_name; | |
7d29a247 | 1806 | struct ltt_kernel_channel *kchan; |
0d0c377a | 1807 | struct ltt_kernel_event *kevent; |
9f19cc17 | 1808 | struct lttng_event *event_list; |
7d29a247 | 1809 | struct lttng_channel *chan; |
33a2b854 DG |
1810 | |
1811 | /* Setup lttng message with no payload */ | |
1812 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1813 | if (ret < 0) { | |
1814 | goto setup_error; | |
1815 | } | |
1816 | ||
1817 | DBG("Enabling all kernel event"); | |
1818 | ||
7d29a247 DG |
1819 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1820 | ||
0d0c377a DG |
1821 | switch (cmd_ctx->lsm->domain.type) { |
1822 | case LTTNG_DOMAIN_KERNEL: | |
b389abbe MD |
1823 | kchan = get_kernel_channel_by_name(channel_name, |
1824 | cmd_ctx->session->kernel_session); | |
1825 | if (kchan == NULL) { | |
1826 | DBG("Channel not found. Creating channel %s", channel_name); | |
1827 | ||
1828 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
1829 | if (chan == NULL) { | |
1830 | ret = LTTCOMM_FATAL; | |
1831 | goto error; | |
1832 | } | |
1833 | ||
1834 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
1835 | chan, cmd_ctx->session->kernel_session->trace_path); | |
1836 | if (ret < 0) { | |
1837 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1838 | goto error; | |
1839 | } | |
0d0c377a DG |
1840 | kchan = get_kernel_channel_by_name(channel_name, |
1841 | cmd_ctx->session->kernel_session); | |
1842 | if (kchan == NULL) { | |
b389abbe MD |
1843 | ERR("Channel %s not found after creation. Internal error, giving up.", |
1844 | channel_name); | |
1845 | ret = LTTCOMM_FATAL; | |
1846 | goto error; | |
7d29a247 | 1847 | } |
b389abbe | 1848 | } |
7d29a247 | 1849 | |
0d0c377a DG |
1850 | /* For each event in the kernel session */ |
1851 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1852 | DBG("Enabling kernel event %s for channel %s.", | |
1853 | kevent->event->name, channel_name); | |
1854 | ret = kernel_enable_event(kevent); | |
7d29a247 | 1855 | if (ret < 0) { |
0d0c377a | 1856 | continue; |
7d29a247 DG |
1857 | } |
1858 | } | |
33a2b854 | 1859 | |
0d0c377a DG |
1860 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
1861 | if (size < 0) { | |
1862 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1863 | goto error; | |
f3ed775e | 1864 | } |
f3ed775e | 1865 | |
0d0c377a DG |
1866 | for (i = 0; i < size; i++) { |
1867 | kevent = get_kernel_event_by_name(event_list[i].name, kchan); | |
1868 | if (kevent == NULL) { | |
1869 | /* Default event type for enable all */ | |
1870 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
1871 | /* Enable each single tracepoint event */ | |
1872 | ret = kernel_create_event(&event_list[i], kchan); | |
1873 | if (ret < 0) { | |
1874 | /* Ignore error here and continue */ | |
1875 | } | |
950131af | 1876 | } |
33a2b854 | 1877 | } |
33a2b854 | 1878 | |
0d0c377a DG |
1879 | free(event_list); |
1880 | ||
1881 | /* Quiescent wait after event enable */ | |
1882 | kernel_wait_quiescent(kernel_tracer_fd); | |
1883 | break; | |
1884 | default: | |
1885 | /* TODO: Userspace tracing */ | |
1886 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1887 | goto error; | |
1888 | } | |
33a2b854 DG |
1889 | |
1890 | ret = LTTCOMM_OK; | |
1891 | break; | |
1892 | } | |
052da939 | 1893 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 1894 | { |
9f19cc17 | 1895 | struct lttng_event *events; |
052da939 DG |
1896 | ssize_t nb_events = 0; |
1897 | ||
1898 | switch (cmd_ctx->lsm->domain.type) { | |
1899 | case LTTNG_DOMAIN_KERNEL: | |
1900 | DBG("Listing kernel events"); | |
1901 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
1902 | if (nb_events < 0) { | |
1903 | ret = LTTCOMM_KERN_LIST_FAIL; | |
1904 | goto error; | |
1905 | } | |
1906 | break; | |
1907 | default: | |
1908 | /* TODO: Userspace listing */ | |
1909 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1910 | break; | |
2ef84c95 DG |
1911 | } |
1912 | ||
1913 | /* | |
1914 | * Setup lttng message with payload size set to the event list size in | |
1915 | * bytes and then copy list into the llm payload. | |
1916 | */ | |
052da939 | 1917 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 1918 | if (ret < 0) { |
052da939 | 1919 | free(events); |
2ef84c95 DG |
1920 | goto setup_error; |
1921 | } | |
1922 | ||
1923 | /* Copy event list into message payload */ | |
9f19cc17 | 1924 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 1925 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 1926 | |
9f19cc17 | 1927 | free(events); |
2ef84c95 DG |
1928 | |
1929 | ret = LTTCOMM_OK; | |
1930 | break; | |
1931 | } | |
f3ed775e | 1932 | case LTTNG_START_TRACE: |
8c0faa1d DG |
1933 | { |
1934 | struct ltt_kernel_channel *chan; | |
f3ed775e | 1935 | |
8c0faa1d DG |
1936 | /* Setup lttng message with no payload */ |
1937 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1938 | if (ret < 0) { | |
1939 | goto setup_error; | |
1940 | } | |
1941 | ||
f3ed775e DG |
1942 | /* Kernel tracing */ |
1943 | if (cmd_ctx->session->kernel_session != NULL) { | |
1944 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
1945 | DBG("Open kernel metadata"); | |
58a97671 | 1946 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
63053e7c | 1947 | cmd_ctx->session->kernel_session->trace_path); |
f3ed775e DG |
1948 | if (ret < 0) { |
1949 | ret = LTTCOMM_KERN_META_FAIL; | |
1950 | goto error; | |
1951 | } | |
1952 | } | |
8c0faa1d | 1953 | |
f3ed775e DG |
1954 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
1955 | DBG("Opening kernel metadata stream"); | |
1956 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
1957 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
1958 | if (ret < 0) { | |
1959 | ERR("Kernel create metadata stream failed"); | |
1960 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1961 | goto error; | |
1962 | } | |
1963 | } | |
1964 | } | |
8c0faa1d | 1965 | |
f3ed775e | 1966 | /* For each channel */ |
0d0c377a DG |
1967 | cds_list_for_each_entry(chan, |
1968 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
1969 | if (chan->stream_count == 0) { |
1970 | ret = kernel_open_channel_stream(chan); | |
1971 | if (ret < 0) { | |
1972 | ERR("Kernel create channel stream failed"); | |
1973 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
1974 | goto error; | |
1975 | } | |
1976 | /* Update the stream global counter */ | |
1977 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
1978 | } | |
1979 | } | |
1980 | ||
283046e0 | 1981 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
8c0faa1d | 1982 | if (ret < 0) { |
f3ed775e | 1983 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
1984 | goto error; |
1985 | } | |
8c0faa1d | 1986 | |
283046e0 DG |
1987 | DBG("Start kernel tracing"); |
1988 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
f3ed775e | 1989 | if (ret < 0) { |
283046e0 | 1990 | ERR("Kernel start session failed"); |
f3ed775e | 1991 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
1992 | goto error; |
1993 | } | |
8c0faa1d | 1994 | |
f3ed775e DG |
1995 | /* Quiescent wait after starting trace */ |
1996 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
1997 | } |
1998 | ||
f3ed775e | 1999 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
2000 | |
2001 | ret = LTTCOMM_OK; | |
2002 | break; | |
2003 | } | |
f3ed775e | 2004 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2005 | { |
f3ed775e | 2006 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
2007 | /* Setup lttng message with no payload */ |
2008 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2009 | if (ret < 0) { | |
2010 | goto setup_error; | |
2011 | } | |
2012 | ||
f3ed775e DG |
2013 | /* Kernel tracer */ |
2014 | if (cmd_ctx->session->kernel_session != NULL) { | |
2015 | DBG("Stop kernel tracing"); | |
84291629 | 2016 | |
f3ed775e DG |
2017 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
2018 | if (ret < 0) { | |
2019 | ERR("Kernel metadata flush failed"); | |
2020 | } | |
8c0faa1d | 2021 | |
f3ed775e DG |
2022 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
2023 | ret = kernel_flush_buffer(chan); | |
2024 | if (ret < 0) { | |
2025 | ERR("Kernel flush buffer error"); | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
2030 | if (ret < 0) { | |
2031 | ERR("Kernel stop session failed"); | |
2032 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2033 | goto error; | |
2034 | } | |
2035 | ||
2036 | /* Quiescent wait after stopping trace */ | |
2037 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2038 | } |
2039 | ||
f3ed775e | 2040 | /* TODO : User-space tracer */ |
8c0faa1d DG |
2041 | |
2042 | ret = LTTCOMM_OK; | |
2043 | break; | |
2044 | } | |
5e16da05 MD |
2045 | case LTTNG_CREATE_SESSION: |
2046 | { | |
5461b305 DG |
2047 | /* Setup lttng message with no payload */ |
2048 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2049 | if (ret < 0) { | |
2050 | goto setup_error; | |
2051 | } | |
2052 | ||
42abccdb | 2053 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
5e16da05 | 2054 | if (ret < 0) { |
f3ed775e | 2055 | if (ret == -EEXIST) { |
5e16da05 MD |
2056 | ret = LTTCOMM_EXIST_SESS; |
2057 | } else { | |
aaf97519 | 2058 | ret = LTTCOMM_FATAL; |
aaf97519 | 2059 | } |
5461b305 | 2060 | goto error; |
8028d920 | 2061 | } |
1657e9bb | 2062 | |
5461b305 | 2063 | ret = LTTCOMM_OK; |
5e16da05 MD |
2064 | break; |
2065 | } | |
2066 | case LTTNG_DESTROY_SESSION: | |
2067 | { | |
5461b305 DG |
2068 | /* Setup lttng message with no payload */ |
2069 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2070 | if (ret < 0) { | |
2071 | goto setup_error; | |
2072 | } | |
2073 | ||
f3ed775e DG |
2074 | /* Clean kernel session teardown */ |
2075 | teardown_kernel_session(cmd_ctx->session); | |
2076 | ||
42abccdb | 2077 | ret = destroy_session(cmd_ctx->lsm->session.name); |
5e16da05 | 2078 | if (ret < 0) { |
f3ed775e | 2079 | ret = LTTCOMM_FATAL; |
5461b305 | 2080 | goto error; |
5e16da05 | 2081 | } |
1657e9bb | 2082 | |
7a485870 DG |
2083 | /* |
2084 | * Must notify the kernel thread here to update it's pollfd in order to | |
2085 | * remove the channel(s)' fd just destroyed. | |
2086 | */ | |
2087 | ret = notify_kernel_pollfd(); | |
2088 | if (ret < 0) { | |
2089 | ret = LTTCOMM_FATAL; | |
2090 | goto error; | |
2091 | } | |
2092 | ||
5461b305 DG |
2093 | ret = LTTCOMM_OK; |
2094 | break; | |
5e16da05 | 2095 | } |
9f19cc17 | 2096 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2097 | { |
4b222185 | 2098 | size_t nb_dom = 0; |
5461b305 | 2099 | |
9f19cc17 DG |
2100 | if (cmd_ctx->session->kernel_session != NULL) { |
2101 | nb_dom++; | |
ce3d728c | 2102 | } |
520ff687 | 2103 | |
9f19cc17 DG |
2104 | nb_dom += cmd_ctx->session->ust_trace_count; |
2105 | ||
2106 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2107 | if (ret < 0) { |
2108 | goto setup_error; | |
520ff687 | 2109 | } |
57167058 | 2110 | |
9f19cc17 DG |
2111 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2112 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2113 | |
9f19cc17 | 2114 | /* TODO: User-space tracer domain support */ |
5461b305 | 2115 | ret = LTTCOMM_OK; |
5e16da05 MD |
2116 | break; |
2117 | } | |
9f19cc17 | 2118 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2119 | { |
9f19cc17 DG |
2120 | /* |
2121 | * TODO: Only kernel channels are listed here. UST listing | |
2122 | * is needed on lttng-ust 2.0 release. | |
2123 | */ | |
2124 | size_t nb_chan = 0; | |
2125 | if (cmd_ctx->session->kernel_session != NULL) { | |
2126 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2127 | } |
ca95a216 | 2128 | |
9f19cc17 DG |
2129 | ret = setup_lttng_msg(cmd_ctx, |
2130 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2131 | if (ret < 0) { |
2132 | goto setup_error; | |
2133 | } | |
9f19cc17 DG |
2134 | |
2135 | list_lttng_channels(cmd_ctx->session, | |
2136 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2137 | ||
2138 | ret = LTTCOMM_OK; | |
5461b305 | 2139 | break; |
5e16da05 | 2140 | } |
9f19cc17 | 2141 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2142 | { |
9f19cc17 DG |
2143 | /* |
2144 | * TODO: Only kernel events are listed here. UST listing | |
2145 | * is needed on lttng-ust 2.0 release. | |
2146 | */ | |
2147 | size_t nb_event = 0; | |
2148 | struct ltt_kernel_channel *kchan = NULL; | |
2149 | ||
2150 | if (cmd_ctx->session->kernel_session != NULL) { | |
2151 | kchan = get_kernel_channel_by_name(cmd_ctx->lsm->u.list.channel_name, | |
2152 | cmd_ctx->session->kernel_session); | |
2153 | if (kchan == NULL) { | |
2154 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2155 | goto error; | |
2156 | } | |
2157 | nb_event += kchan->event_count; | |
5461b305 | 2158 | } |
ca95a216 | 2159 | |
9f19cc17 DG |
2160 | ret = setup_lttng_msg(cmd_ctx, |
2161 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2162 | if (ret < 0) { |
2163 | goto setup_error; | |
2164 | } | |
9f19cc17 | 2165 | |
ced2f820 | 2166 | DBG("Listing events (%zu events)", nb_event); |
9f19cc17 DG |
2167 | |
2168 | list_lttng_events(kchan, | |
2169 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2170 | ||
2171 | ret = LTTCOMM_OK; | |
5461b305 | 2172 | break; |
5e16da05 MD |
2173 | } |
2174 | case LTTNG_LIST_SESSIONS: | |
2175 | { | |
6c9cc2ab | 2176 | lock_session_list(); |
5461b305 | 2177 | |
6c9cc2ab | 2178 | if (session_list_ptr->count == 0) { |
f3ed775e | 2179 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2180 | unlock_session_list(); |
5461b305 | 2181 | goto error; |
57167058 | 2182 | } |
5e16da05 | 2183 | |
6c9cc2ab DG |
2184 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2185 | session_list_ptr->count); | |
5461b305 | 2186 | if (ret < 0) { |
36a83748 | 2187 | unlock_session_list(); |
5461b305 | 2188 | goto setup_error; |
e065084a | 2189 | } |
5e16da05 | 2190 | |
6c9cc2ab DG |
2191 | /* Filled the session array */ |
2192 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2193 | ||
2194 | unlock_session_list(); | |
5e16da05 | 2195 | |
5461b305 | 2196 | ret = LTTCOMM_OK; |
5e16da05 MD |
2197 | break; |
2198 | } | |
d0254c7c MD |
2199 | case LTTNG_CALIBRATE: |
2200 | { | |
2201 | /* Setup lttng message with no payload */ | |
2202 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2203 | if (ret < 0) { | |
2204 | goto setup_error; | |
2205 | } | |
2206 | ||
2207 | switch (cmd_ctx->lsm->domain.type) { | |
2208 | case LTTNG_DOMAIN_KERNEL: | |
2209 | { | |
2210 | struct lttng_kernel_calibrate kcalibrate; | |
2211 | ||
2212 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2213 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2214 | if (ret < 0) { | |
2215 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2216 | goto error; | |
2217 | } | |
2218 | break; | |
2219 | } | |
2220 | default: | |
2221 | /* TODO: Userspace tracing */ | |
2222 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2223 | goto error; | |
2224 | } | |
2225 | ret = LTTCOMM_OK; | |
2226 | break; | |
2227 | } | |
d9800920 DG |
2228 | case LTTNG_REGISTER_CONSUMER: |
2229 | { | |
2230 | int sock; | |
2231 | ||
2232 | /* Setup lttng message with no payload */ | |
2233 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2234 | if (ret < 0) { | |
2235 | goto setup_error; | |
2236 | } | |
2237 | ||
2238 | switch (cmd_ctx->lsm->domain.type) { | |
2239 | case LTTNG_DOMAIN_KERNEL: | |
2240 | { | |
2241 | /* Can't register a consumer if there is already one */ | |
2242 | if (cmd_ctx->session->kernel_session->consumer_fd != 0) { | |
2243 | ret = LTTCOMM_CONNECT_FAIL; | |
2244 | goto error; | |
2245 | } | |
2246 | ||
2247 | sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path); | |
2248 | if (sock < 0) { | |
2249 | ret = LTTCOMM_CONNECT_FAIL; | |
2250 | goto error; | |
2251 | } | |
2252 | ||
2253 | cmd_ctx->session->kernel_session->consumer_fd = sock; | |
2254 | break; | |
2255 | } | |
2256 | default: | |
2257 | /* TODO: Userspace tracing */ | |
2258 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2259 | goto error; | |
2260 | } | |
2261 | ||
2262 | ret = LTTCOMM_OK; | |
2263 | break; | |
2264 | } | |
d0254c7c | 2265 | |
5e16da05 MD |
2266 | default: |
2267 | /* Undefined command */ | |
5461b305 DG |
2268 | ret = setup_lttng_msg(cmd_ctx, 0); |
2269 | if (ret < 0) { | |
2270 | goto setup_error; | |
2271 | } | |
2272 | ||
5e16da05 | 2273 | ret = LTTCOMM_UND; |
5461b305 | 2274 | break; |
fac6795d DG |
2275 | } |
2276 | ||
5461b305 DG |
2277 | /* Set return code */ |
2278 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2279 | |
b5541356 DG |
2280 | if (cmd_ctx->session) { |
2281 | unlock_session(cmd_ctx->session); | |
2282 | } | |
2283 | ||
e065084a DG |
2284 | return ret; |
2285 | ||
5461b305 | 2286 | error: |
5461b305 DG |
2287 | if (cmd_ctx->llm == NULL) { |
2288 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2289 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2290 | goto setup_error; |
2291 | } | |
2292 | } | |
e065084a | 2293 | /* Notify client of error */ |
5461b305 | 2294 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2295 | |
5461b305 | 2296 | setup_error: |
b5541356 DG |
2297 | if (cmd_ctx->session) { |
2298 | unlock_session(cmd_ctx->session); | |
2299 | } | |
8028d920 | 2300 | return ret; |
fac6795d DG |
2301 | } |
2302 | ||
1d4b027a | 2303 | /* |
d063d709 DG |
2304 | * This thread manage all clients request using the unix client socket for |
2305 | * communication. | |
1d4b027a DG |
2306 | */ |
2307 | static void *thread_manage_clients(void *data) | |
2308 | { | |
273ea72c DG |
2309 | int sock = 0, ret; |
2310 | struct command_ctx *cmd_ctx = NULL; | |
2311 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2312 | |
2313 | DBG("[thread] Manage client started"); | |
2314 | ||
2315 | ret = lttcomm_listen_unix_sock(client_sock); | |
2316 | if (ret < 0) { | |
2317 | goto error; | |
2318 | } | |
2319 | ||
273ea72c DG |
2320 | /* First fd is always the quit pipe */ |
2321 | pollfd[0].fd = thread_quit_pipe[0]; | |
2322 | ||
2323 | /* Apps socket */ | |
2324 | pollfd[1].fd = client_sock; | |
2325 | pollfd[1].events = POLLIN; | |
2326 | ||
1d4b027a DG |
2327 | /* Notify parent pid that we are ready |
2328 | * to accept command for client side. | |
2329 | */ | |
2330 | if (opt_sig_parent) { | |
2331 | kill(ppid, SIGCHLD); | |
2332 | } | |
2333 | ||
2334 | while (1) { | |
1d4b027a | 2335 | DBG("Accepting client command ..."); |
273ea72c DG |
2336 | |
2337 | /* Inifinite blocking call, waiting for transmission */ | |
2338 | ret = poll(pollfd, 2, -1); | |
2339 | if (ret < 0) { | |
2340 | perror("poll client thread"); | |
2341 | goto error; | |
2342 | } | |
2343 | ||
2344 | /* Thread quit pipe has been closed. Killing thread. */ | |
2345 | if (pollfd[0].revents == POLLNVAL) { | |
2346 | goto error; | |
2347 | } else if (pollfd[1].revents == POLLERR) { | |
2348 | ERR("Client socket poll error"); | |
2349 | goto error; | |
2350 | } | |
2351 | ||
1d4b027a DG |
2352 | sock = lttcomm_accept_unix_sock(client_sock); |
2353 | if (sock < 0) { | |
2354 | goto error; | |
2355 | } | |
2356 | ||
2357 | /* Allocate context command to process the client request */ | |
2358 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2359 | ||
2360 | /* Allocate data buffer for reception */ | |
2361 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2362 | cmd_ctx->llm = NULL; | |
2363 | cmd_ctx->session = NULL; | |
2364 | ||
2365 | /* | |
2366 | * Data is received from the lttng client. The struct | |
2367 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2368 | * the client. | |
2369 | */ | |
2370 | DBG("Receiving data from client ..."); | |
2371 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2372 | if (ret <= 0) { | |
2373 | continue; | |
2374 | } | |
2375 | ||
f7776ea7 DG |
2376 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2377 | ||
1d4b027a DG |
2378 | /* |
2379 | * This function dispatch the work to the kernel or userspace tracer | |
2380 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2381 | * informations for the client. The command context struct contains | |
2382 | * everything this function may needs. | |
2383 | */ | |
2384 | ret = process_client_msg(cmd_ctx); | |
2385 | if (ret < 0) { | |
2386 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2387 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2388 | /* Error detected but still accept command */ | |
a2fb29a5 | 2389 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2390 | continue; |
2391 | } | |
2392 | ||
2393 | DBG("Sending response (size: %d, retcode: %d)", | |
2394 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2395 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2396 | if (ret < 0) { | |
2397 | ERR("Failed to send data back to client"); | |
2398 | } | |
2399 | ||
a2fb29a5 | 2400 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2401 | |
2402 | /* End of transmission */ | |
2403 | close(sock); | |
1d4b027a DG |
2404 | } |
2405 | ||
2406 | error: | |
273ea72c DG |
2407 | DBG("Client thread dying"); |
2408 | if (client_sock) { | |
2409 | close(client_sock); | |
2410 | } | |
2411 | if (sock) { | |
2412 | close(sock); | |
2413 | } | |
2414 | ||
2415 | unlink(client_unix_sock_path); | |
2416 | ||
a2fb29a5 | 2417 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2418 | return NULL; |
2419 | } | |
2420 | ||
2421 | ||
fac6795d DG |
2422 | /* |
2423 | * usage function on stderr | |
2424 | */ | |
2425 | static void usage(void) | |
2426 | { | |
b716ce68 | 2427 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2428 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2429 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2430 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2431 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2432 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2433 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2434 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2435 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2436 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2437 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2438 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2439 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2440 | } |
2441 | ||
2442 | /* | |
2443 | * daemon argument parsing | |
2444 | */ | |
2445 | static int parse_args(int argc, char **argv) | |
2446 | { | |
2447 | int c; | |
2448 | ||
2449 | static struct option long_options[] = { | |
2450 | { "client-sock", 1, 0, 'c' }, | |
2451 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2452 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2453 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2454 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2455 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2456 | { "help", 0, 0, 'h' }, |
2457 | { "group", 1, 0, 'g' }, | |
2458 | { "version", 0, 0, 'V' }, | |
75462a81 | 2459 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2460 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2461 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2462 | { NULL, 0, 0, 0 } |
2463 | }; | |
2464 | ||
2465 | while (1) { | |
2466 | int option_index = 0; | |
31f73cc9 | 2467 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2468 | if (c == -1) { |
2469 | break; | |
2470 | } | |
2471 | ||
2472 | switch (c) { | |
2473 | case 0: | |
2474 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2475 | if (optarg) { | |
2476 | fprintf(stderr, " with arg %s\n", optarg); | |
2477 | } | |
2478 | break; | |
b716ce68 | 2479 | case 'c': |
fac6795d DG |
2480 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2481 | break; | |
2482 | case 'a': | |
2483 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2484 | break; | |
2485 | case 'd': | |
2486 | opt_daemon = 1; | |
2487 | break; | |
2488 | case 'g': | |
2489 | opt_tracing_group = strdup(optarg); | |
2490 | break; | |
2491 | case 'h': | |
2492 | usage(); | |
2493 | exit(EXIT_FAILURE); | |
2494 | case 'V': | |
2495 | fprintf(stdout, "%s\n", VERSION); | |
2496 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2497 | case 'S': |
2498 | opt_sig_parent = 1; | |
2499 | break; | |
d6f42150 DG |
2500 | case 'E': |
2501 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2502 | break; | |
2503 | case 'C': | |
2504 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2505 | break; | |
75462a81 DG |
2506 | case 'q': |
2507 | opt_quiet = 1; | |
2508 | break; | |
3f9947db | 2509 | case 'v': |
53086306 DG |
2510 | /* Verbose level can increase using multiple -v */ |
2511 | opt_verbose += 1; | |
3f9947db | 2512 | break; |
31f73cc9 MD |
2513 | case 'Z': |
2514 | opt_verbose_kconsumerd += 1; | |
2515 | break; | |
fac6795d DG |
2516 | default: |
2517 | /* Unknown option or other error. | |
2518 | * Error is printed by getopt, just return */ | |
2519 | return -1; | |
2520 | } | |
2521 | } | |
2522 | ||
2523 | return 0; | |
2524 | } | |
2525 | ||
2526 | /* | |
d063d709 | 2527 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2528 | * apps_sock - The communication socket for all UST apps. |
2529 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2530 | */ |
cf3af59e | 2531 | static int init_daemon_socket(void) |
fac6795d DG |
2532 | { |
2533 | int ret = 0; | |
2534 | mode_t old_umask; | |
2535 | ||
2536 | old_umask = umask(0); | |
2537 | ||
2538 | /* Create client tool unix socket */ | |
d6f42150 DG |
2539 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2540 | if (client_sock < 0) { | |
2541 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2542 | ret = -1; |
2543 | goto end; | |
2544 | } | |
2545 | ||
2546 | /* File permission MUST be 660 */ | |
2547 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2548 | if (ret < 0) { | |
d6f42150 | 2549 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2550 | perror("chmod"); |
2551 | goto end; | |
2552 | } | |
2553 | ||
2554 | /* Create the application unix socket */ | |
d6f42150 DG |
2555 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2556 | if (apps_sock < 0) { | |
2557 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2558 | ret = -1; |
2559 | goto end; | |
2560 | } | |
2561 | ||
d6f42150 | 2562 | /* File permission MUST be 666 */ |
fac6795d DG |
2563 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2564 | if (ret < 0) { | |
d6f42150 | 2565 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2566 | perror("chmod"); |
2567 | goto end; | |
2568 | } | |
2569 | ||
2570 | end: | |
2571 | umask(old_umask); | |
2572 | return ret; | |
2573 | } | |
2574 | ||
2575 | /* | |
7d8234d9 MD |
2576 | * Check if the global socket is available, and if a daemon is answering |
2577 | * at the other side. If yes, error is returned. | |
fac6795d | 2578 | */ |
cf3af59e | 2579 | static int check_existing_daemon(void) |
fac6795d | 2580 | { |
7d8234d9 MD |
2581 | if (access(client_unix_sock_path, F_OK) < 0 && |
2582 | access(apps_unix_sock_path, F_OK) < 0) | |
2583 | return 0; | |
2584 | /* Is there anybody out there ? */ | |
2585 | if (lttng_session_daemon_alive()) | |
2586 | return -EEXIST; | |
2587 | else | |
2588 | return 0; | |
fac6795d DG |
2589 | } |
2590 | ||
fac6795d | 2591 | /* |
d063d709 | 2592 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2593 | * |
d063d709 DG |
2594 | * Race window between mkdir and chown is OK because we are going from more |
2595 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2596 | */ |
d6f42150 | 2597 | static int set_permissions(void) |
fac6795d DG |
2598 | { |
2599 | int ret; | |
996b65c8 | 2600 | gid_t gid; |
fac6795d | 2601 | |
996b65c8 MD |
2602 | gid = allowed_group(); |
2603 | if (gid < 0) { | |
a463f419 DG |
2604 | if (is_root) { |
2605 | WARN("No tracing group detected"); | |
2606 | ret = 0; | |
2607 | } else { | |
2608 | ERR("Missing tracing group. Aborting execution."); | |
2609 | ret = -1; | |
2610 | } | |
fac6795d DG |
2611 | goto end; |
2612 | } | |
2613 | ||
d6f42150 | 2614 | /* Set lttng run dir */ |
996b65c8 | 2615 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
2616 | if (ret < 0) { |
2617 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2618 | perror("chown"); | |
2619 | } | |
2620 | ||
2621 | /* lttng client socket path */ | |
996b65c8 | 2622 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 2623 | if (ret < 0) { |
d6f42150 DG |
2624 | ERR("Unable to set group on %s", client_unix_sock_path); |
2625 | perror("chown"); | |
2626 | } | |
2627 | ||
2628 | /* kconsumerd error socket path */ | |
996b65c8 | 2629 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
2630 | if (ret < 0) { |
2631 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2632 | perror("chown"); |
2633 | } | |
2634 | ||
d6f42150 | 2635 | DBG("All permissions are set"); |
e07ae692 | 2636 | |
fac6795d DG |
2637 | end: |
2638 | return ret; | |
2639 | } | |
2640 | ||
7a485870 | 2641 | /* |
d063d709 | 2642 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2643 | */ |
2644 | static int create_kernel_poll_pipe(void) | |
2645 | { | |
2646 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2647 | } | |
2648 | ||
d6f42150 | 2649 | /* |
d063d709 | 2650 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2651 | */ |
2652 | static int create_lttng_rundir(void) | |
2653 | { | |
2654 | int ret; | |
2655 | ||
2656 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2657 | if (ret < 0) { | |
b1f11e69 DG |
2658 | if (errno != EEXIST) { |
2659 | ERR("Unable to create " LTTNG_RUNDIR); | |
2660 | goto error; | |
2661 | } else { | |
2662 | ret = 0; | |
2663 | } | |
d6f42150 DG |
2664 | } |
2665 | ||
2666 | error: | |
2667 | return ret; | |
2668 | } | |
2669 | ||
2670 | /* | |
d063d709 DG |
2671 | * Setup sockets and directory needed by the kconsumerd communication with the |
2672 | * session daemon. | |
d6f42150 DG |
2673 | */ |
2674 | static int set_kconsumerd_sockets(void) | |
2675 | { | |
2676 | int ret; | |
2677 | ||
2678 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2679 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2680 | } | |
2681 | ||
2682 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2683 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2684 | } | |
2685 | ||
2686 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2687 | if (ret < 0) { | |
6beb2242 DG |
2688 | if (errno != EEXIST) { |
2689 | ERR("Failed to create " KCONSUMERD_PATH); | |
2690 | goto error; | |
2691 | } | |
2692 | ret = 0; | |
d6f42150 DG |
2693 | } |
2694 | ||
2695 | /* Create the kconsumerd error unix socket */ | |
2696 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
2697 | if (kconsumerd_err_sock < 0) { | |
2698 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
2699 | ret = -1; | |
2700 | goto error; | |
2701 | } | |
2702 | ||
2703 | /* File permission MUST be 660 */ | |
2704 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2705 | if (ret < 0) { | |
2706 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
2707 | perror("chmod"); | |
2708 | goto error; | |
2709 | } | |
2710 | ||
2711 | error: | |
2712 | return ret; | |
2713 | } | |
2714 | ||
fac6795d | 2715 | /* |
d063d709 | 2716 | * Signal handler for the daemon |
cf3af59e MD |
2717 | * |
2718 | * Simply stop all worker threads, leaving main() return gracefully | |
2719 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
2720 | */ |
2721 | static void sighandler(int sig) | |
2722 | { | |
2723 | switch (sig) { | |
cf3af59e MD |
2724 | case SIGPIPE: |
2725 | DBG("SIGPIPE catched"); | |
2726 | return; | |
2727 | case SIGINT: | |
2728 | DBG("SIGINT catched"); | |
2729 | stop_threads(); | |
2730 | break; | |
2731 | case SIGTERM: | |
2732 | DBG("SIGTERM catched"); | |
2733 | stop_threads(); | |
2734 | break; | |
2735 | default: | |
2736 | break; | |
fac6795d | 2737 | } |
fac6795d DG |
2738 | } |
2739 | ||
2740 | /* | |
d063d709 | 2741 | * Setup signal handler for : |
1d4b027a | 2742 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 2743 | */ |
1d4b027a | 2744 | static int set_signal_handler(void) |
fac6795d | 2745 | { |
1d4b027a DG |
2746 | int ret = 0; |
2747 | struct sigaction sa; | |
2748 | sigset_t sigset; | |
fac6795d | 2749 | |
1d4b027a DG |
2750 | if ((ret = sigemptyset(&sigset)) < 0) { |
2751 | perror("sigemptyset"); | |
2752 | return ret; | |
2753 | } | |
d6f42150 | 2754 | |
1d4b027a DG |
2755 | sa.sa_handler = sighandler; |
2756 | sa.sa_mask = sigset; | |
2757 | sa.sa_flags = 0; | |
2758 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
2759 | perror("sigaction"); | |
2760 | return ret; | |
d6f42150 DG |
2761 | } |
2762 | ||
1d4b027a DG |
2763 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
2764 | perror("sigaction"); | |
2765 | return ret; | |
d6f42150 | 2766 | } |
aaf26714 | 2767 | |
1d4b027a DG |
2768 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
2769 | perror("sigaction"); | |
2770 | return ret; | |
8c0faa1d DG |
2771 | } |
2772 | ||
1d4b027a DG |
2773 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
2774 | ||
2775 | return ret; | |
fac6795d DG |
2776 | } |
2777 | ||
f3ed775e | 2778 | /* |
d063d709 DG |
2779 | * Set open files limit to unlimited. This daemon can open a large number of |
2780 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
2781 | */ |
2782 | static void set_ulimit(void) | |
2783 | { | |
2784 | int ret; | |
2785 | struct rlimit lim; | |
2786 | ||
a88df331 | 2787 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
2788 | lim.rlim_cur = 65535; |
2789 | lim.rlim_max = 65535; | |
2790 | ||
2791 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
2792 | if (ret < 0) { | |
2793 | perror("failed to set open files limit"); | |
2794 | } | |
2795 | } | |
2796 | ||
fac6795d DG |
2797 | /* |
2798 | * main | |
2799 | */ | |
2800 | int main(int argc, char **argv) | |
2801 | { | |
fac6795d DG |
2802 | int ret = 0; |
2803 | void *status; | |
b082db07 | 2804 | const char *home_path; |
fac6795d | 2805 | |
273ea72c | 2806 | /* Create thread quit pipe */ |
cf3af59e MD |
2807 | if ((ret = init_thread_quit_pipe()) < 0) { |
2808 | goto error; | |
273ea72c DG |
2809 | } |
2810 | ||
fac6795d DG |
2811 | /* Parse arguments */ |
2812 | progname = argv[0]; | |
2813 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 2814 | goto error; |
fac6795d DG |
2815 | } |
2816 | ||
2817 | /* Daemonize */ | |
2818 | if (opt_daemon) { | |
53094c05 DG |
2819 | ret = daemon(0, 0); |
2820 | if (ret < 0) { | |
2821 | perror("daemon"); | |
cf3af59e | 2822 | goto error; |
53094c05 | 2823 | } |
fac6795d DG |
2824 | } |
2825 | ||
2826 | /* Check if daemon is UID = 0 */ | |
2827 | is_root = !getuid(); | |
2828 | ||
fac6795d | 2829 | if (is_root) { |
d6f42150 DG |
2830 | ret = create_lttng_rundir(); |
2831 | if (ret < 0) { | |
cf3af59e | 2832 | goto error; |
d6f42150 DG |
2833 | } |
2834 | ||
fac6795d | 2835 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
2836 | snprintf(apps_unix_sock_path, PATH_MAX, |
2837 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
2838 | } |
2839 | ||
2840 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
2841 | snprintf(client_unix_sock_path, PATH_MAX, |
2842 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
2843 | } | |
fac6795d | 2844 | } else { |
b082db07 DG |
2845 | home_path = get_home_dir(); |
2846 | if (home_path == NULL) { | |
273ea72c DG |
2847 | /* TODO: Add --socket PATH option */ |
2848 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
2849 | ret = -EPERM; |
2850 | goto error; | |
b082db07 DG |
2851 | } |
2852 | ||
fac6795d | 2853 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 2854 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 2855 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
2856 | } |
2857 | ||
2858 | /* Set the cli tool unix socket path */ | |
2859 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 2860 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 2861 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d DG |
2862 | } |
2863 | } | |
2864 | ||
847177cd DG |
2865 | DBG("Client socket path %s", client_unix_sock_path); |
2866 | DBG("Application socket path %s", apps_unix_sock_path); | |
2867 | ||
273ea72c | 2868 | /* |
7d8234d9 | 2869 | * See if daemon already exist. |
fac6795d | 2870 | */ |
7d8234d9 | 2871 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 2872 | ERR("Already running daemon.\n"); |
273ea72c | 2873 | /* |
cf3af59e MD |
2874 | * We do not goto exit because we must not cleanup() |
2875 | * because a daemon is already running. | |
ab118b20 | 2876 | */ |
cf3af59e | 2877 | goto error; |
a88df331 DG |
2878 | } |
2879 | ||
2880 | /* After this point, we can safely call cleanup() so goto error is used */ | |
2881 | ||
2882 | /* | |
2883 | * These actions must be executed as root. We do that *after* setting up | |
2884 | * the sockets path because we MUST make the check for another daemon using | |
2885 | * those paths *before* trying to set the kernel consumer sockets and init | |
2886 | * kernel tracer. | |
2887 | */ | |
2888 | if (is_root) { | |
2889 | ret = set_kconsumerd_sockets(); | |
2890 | if (ret < 0) { | |
cf3af59e | 2891 | goto exit; |
a88df331 DG |
2892 | } |
2893 | ||
2894 | /* Setup kernel tracer */ | |
2895 | init_kernel_tracer(); | |
2896 | ||
2897 | /* Set ulimit for open files */ | |
2898 | set_ulimit(); | |
fac6795d DG |
2899 | } |
2900 | ||
cf3af59e MD |
2901 | if ((ret = set_signal_handler()) < 0) { |
2902 | goto exit; | |
fac6795d DG |
2903 | } |
2904 | ||
d6f42150 | 2905 | /* Setup the needed unix socket */ |
cf3af59e MD |
2906 | if ((ret = init_daemon_socket()) < 0) { |
2907 | goto exit; | |
fac6795d DG |
2908 | } |
2909 | ||
2910 | /* Set credentials to socket */ | |
cf3af59e MD |
2911 | if (is_root && ((ret = set_permissions()) < 0)) { |
2912 | goto exit; | |
fac6795d DG |
2913 | } |
2914 | ||
5b8719f5 DG |
2915 | /* Get parent pid if -S, --sig-parent is specified. */ |
2916 | if (opt_sig_parent) { | |
2917 | ppid = getppid(); | |
2918 | } | |
2919 | ||
7a485870 | 2920 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
2921 | if ((ret = create_kernel_poll_pipe()) < 0) { |
2922 | goto exit; | |
7a485870 DG |
2923 | } |
2924 | ||
273ea72c DG |
2925 | /* |
2926 | * Get session list pointer. This pointer MUST NOT be free(). | |
2927 | * This list is statically declared in session.c | |
2928 | */ | |
b5541356 DG |
2929 | session_list_ptr = get_session_list(); |
2930 | ||
cf3af59e MD |
2931 | /* Create thread to manage the client socket */ |
2932 | ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL); | |
2933 | if (ret != 0) { | |
2934 | perror("pthread_create"); | |
2935 | goto exit_client; | |
2936 | } | |
fac6795d | 2937 | |
cf3af59e MD |
2938 | /* Create thread to manage application socket */ |
2939 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
2940 | if (ret != 0) { | |
2941 | perror("pthread_create"); | |
2942 | goto exit_apps; | |
2943 | } | |
fac6795d | 2944 | |
cf3af59e MD |
2945 | /* Create kernel thread to manage kernel event */ |
2946 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
2947 | if (ret != 0) { | |
2948 | perror("pthread_create"); | |
2949 | goto exit_kernel; | |
2950 | } | |
7a485870 | 2951 | |
cf3af59e MD |
2952 | ret = pthread_join(kernel_thread, &status); |
2953 | if (ret != 0) { | |
2954 | perror("pthread_join"); | |
2955 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
2956 | } |
2957 | ||
cf3af59e MD |
2958 | exit_kernel: |
2959 | ret = pthread_join(apps_thread, &status); | |
2960 | if (ret != 0) { | |
2961 | perror("pthread_join"); | |
2962 | goto error; /* join error, exit without cleanup */ | |
2963 | } | |
fac6795d | 2964 | |
cf3af59e MD |
2965 | exit_apps: |
2966 | ret = pthread_join(client_thread, &status); | |
2967 | if (ret != 0) { | |
2968 | perror("pthread_join"); | |
2969 | goto error; /* join error, exit without cleanup */ | |
2970 | } | |
2971 | ||
2972 | ret = join_kconsumerd_thread(); | |
2973 | if (ret != 0) { | |
2974 | perror("join_kconsumerd"); | |
2975 | goto error; /* join error, exit without cleanup */ | |
2976 | } | |
a88df331 | 2977 | |
cf3af59e | 2978 | exit_client: |
a88df331 | 2979 | exit: |
cf3af59e MD |
2980 | /* |
2981 | * cleanup() is called when no other thread is running. | |
2982 | */ | |
2983 | cleanup(); | |
2984 | if (!ret) | |
2985 | exit(EXIT_SUCCESS); | |
2986 | error: | |
5e16da05 | 2987 | exit(EXIT_FAILURE); |
fac6795d | 2988 | } |