Fix disable event
[lttng-tools.git] / ltt-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d
DG
38#include <unistd.h>
39
1e307fab 40#include <ltt-kconsumerd.h>
e88129fc 41#include <lttng-sessiond-comm.h>
1e307fab
DG
42#include <lttng/lttng-kconsumerd.h>
43#include <lttngerr.h>
fac6795d 44
54d01ffb 45#include "channel.h"
5eb91c98 46#include "compat/poll.h"
099e26bd 47#include "context.h"
54d01ffb 48#include "event.h"
099e26bd 49#include "futex.h"
20fe2104 50#include "kernel-ctl.h"
1e307fab 51#include "ltt-sessiond.h"
0fdd1e2c 52#include "shm.h"
56fff090 53#include "ust-app.h"
1e307fab 54#include "ust-ctl.h"
8e68d1c8 55#include "utils.h"
0177d773 56#include "ust-ctl.h"
fac6795d 57
75462a81 58/* Const values */
686204ab 59const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 60const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
61const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
62const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
63
fac6795d 64/* Variables */
1d4b027a 65int opt_verbose; /* Not static for lttngerr.h */
31f73cc9 66int opt_verbose_kconsumerd; /* Not static for lttngerr.h */
1d4b027a 67int opt_quiet; /* Not static for lttngerr.h */
d063d709 68
fac6795d
DG
69const char *progname;
70const char *opt_tracing_group;
5b8719f5 71static int opt_sig_parent;
fac6795d
DG
72static int opt_daemon;
73static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a
DG
74static pid_t ppid; /* Parent PID for --sig-parent option */
75static pid_t kconsumerd_pid;
099e26bd 76static int dispatch_thread_exit;
fac6795d 77
54d01ffb
DG
78/* Global application Unix socket path */
79static char apps_unix_sock_path[PATH_MAX];
80/* Global client Unix socket path */
81static char client_unix_sock_path[PATH_MAX];
82/* kconsumerd error and command Unix socket path */
83static char kconsumerd_err_unix_sock_path[PATH_MAX];
84static char kconsumerd_cmd_unix_sock_path[PATH_MAX];
85/* global wait shm path for UST */
86static char wait_shm_path[PATH_MAX];
fac6795d 87
1d4b027a 88/* Sockets and FDs */
d6f42150
DG
89static int client_sock;
90static int apps_sock;
91static int kconsumerd_err_sock;
8c0faa1d 92static int kconsumerd_cmd_sock;
20fe2104 93static int kernel_tracer_fd;
7a485870 94static int kernel_poll_pipe[2];
1d4b027a 95
273ea72c
DG
96/*
97 * Quit pipe for all threads. This permits a single cancellation point
98 * for all threads when receiving an event on the pipe.
99 */
100static int thread_quit_pipe[2];
101
099e26bd
DG
102/*
103 * This pipe is used to inform the thread managing application communication
104 * that a command is queued and ready to be processed.
105 */
106static int apps_cmd_pipe[2];
107
1d4b027a 108/* Pthread, Mutexes and Semaphores */
8c0faa1d 109static pthread_t kconsumerd_thread;
1d4b027a 110static pthread_t apps_thread;
099e26bd 111static pthread_t reg_apps_thread;
1d4b027a 112static pthread_t client_thread;
7a485870 113static pthread_t kernel_thread;
099e26bd 114static pthread_t dispatch_thread;
8c0faa1d
DG
115static sem_t kconsumerd_sem;
116
5eb91c98
DG
117
118/* Mutex to control kconsumerd pid assignation */
119static pthread_mutex_t kconsumerd_pid_mutex;
fac6795d 120
099e26bd
DG
121/*
122 * UST registration command queue. This queue is tied with a futex and uses a N
123 * wakers / 1 waiter implemented and detailed in futex.c/.h
124 *
125 * The thread_manage_apps and thread_dispatch_ust_registration interact with
126 * this queue and the wait/wake scheme.
127 */
128static struct ust_cmd_queue ust_cmd_queue;
129
b5541356
DG
130/*
131 * Pointer initialized before thread creation.
132 *
133 * This points to the tracing session list containing the session count and a
134 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
135 * MUST NOT be taken if you call a public function in session.c.
04ea676f 136 *
d063d709 137 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 138 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
139 */
140static struct ltt_session_list *session_list_ptr;
141
5eb91c98
DG
142/*
143 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
144 */
145static int create_thread_poll_set(struct lttng_poll_event *events,
146 unsigned int size)
147{
148 int ret;
149
150 if (events == NULL || size == 0) {
151 ret = -1;
152 goto error;
153 }
154
155 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
156 if (ret < 0) {
157 goto error;
158 }
159
160 /* Add quit pipe */
161 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
162 if (ret < 0) {
163 goto error;
164 }
165
166 return 0;
167
168error:
169 return ret;
170}
171
172/*
173 * Check if the thread quit pipe was triggered.
174 *
175 * Return 1 if it was triggered else 0;
176 */
177static int check_thread_quit_pipe(int fd, uint32_t events)
178{
179 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
180 return 1;
181 }
182
183 return 0;
184}
185
0fdd1e2c
DG
186/*
187 * Remove modules in reverse load order.
188 */
189static int modprobe_remove_kernel_modules(void)
190{
191 int ret = 0, i;
192 char modprobe[256];
193
194 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
195 ret = snprintf(modprobe, sizeof(modprobe),
196 "/sbin/modprobe --remove --quiet %s",
197 kernel_modules_list[i].name);
198 if (ret < 0) {
199 perror("snprintf modprobe --remove");
200 goto error;
201 }
202 modprobe[sizeof(modprobe) - 1] = '\0';
203 ret = system(modprobe);
204 if (ret == -1) {
205 ERR("Unable to launch modprobe --remove for module %s",
206 kernel_modules_list[i].name);
207 } else if (kernel_modules_list[i].required
208 && WEXITSTATUS(ret) != 0) {
209 ERR("Unable to remove module %s",
210 kernel_modules_list[i].name);
211 } else {
212 DBG("Modprobe removal successful %s",
213 kernel_modules_list[i].name);
214 }
215 }
216
217error:
218 return ret;
219}
220
221/*
222 * Return group ID of the tracing group or -1 if not found.
223 */
996b65c8
MD
224static gid_t allowed_group(void)
225{
226 struct group *grp;
227
274e143b
MD
228 if (opt_tracing_group) {
229 grp = getgrnam(opt_tracing_group);
230 } else {
231 grp = getgrnam(default_tracing_group);
232 }
996b65c8
MD
233 if (!grp) {
234 return -1;
235 } else {
236 return grp->gr_gid;
237 }
238}
239
273ea72c 240/*
5eb91c98 241 * Init thread quit pipe.
273ea72c
DG
242 *
243 * Return -1 on error or 0 if all pipes are created.
244 */
245static int init_thread_quit_pipe(void)
246{
247 int ret;
248
249 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
250 if (ret < 0) {
251 perror("thread quit pipe");
252 goto error;
253 }
254
255error:
256 return ret;
257}
258
fac6795d 259/*
d063d709
DG
260 * Complete teardown of a kernel session. This free all data structure related
261 * to a kernel session and update counter.
fac6795d 262 */
1d4b027a 263static void teardown_kernel_session(struct ltt_session *session)
fac6795d 264{
1d4b027a
DG
265 if (session->kernel_session != NULL) {
266 DBG("Tearing down kernel session");
d9800920
DG
267
268 /*
269 * If a custom kernel consumer was registered, close the socket before
270 * tearing down the complete kernel session structure
271 */
272 if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) {
273 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
274 }
275
62499ad6 276 trace_kernel_destroy_session(session->kernel_session);
1d4b027a
DG
277 /* Extra precaution */
278 session->kernel_session = NULL;
fac6795d 279 }
fac6795d
DG
280}
281
099e26bd
DG
282/*
283 * Stop all threads by closing the thread quit pipe.
284 */
cf3af59e
MD
285static void stop_threads(void)
286{
5eb91c98
DG
287 int ret;
288
cf3af59e
MD
289 /* Stopping all threads */
290 DBG("Terminating all threads");
54d01ffb 291 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
292 if (ret < 0) {
293 ERR("write error on thread quit pipe");
294 }
295
099e26bd
DG
296 /* Dispatch thread */
297 dispatch_thread_exit = 1;
298 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
299}
300
fac6795d 301/*
d063d709 302 * Cleanup the daemon
fac6795d 303 */
cf3af59e 304static void cleanup(void)
fac6795d 305{
1d4b027a
DG
306 int ret;
307 char *cmd;
af9737e9 308 struct ltt_session *sess, *stmp;
fac6795d 309
1d4b027a 310 DBG("Cleaning up");
e07ae692 311
1d4b027a 312 /* <fun> */
2f50c8a3 313 MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
273ea72c
DG
314 "Matthew, BEET driven development works!%c[%dm",
315 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
1d4b027a 316 /* </fun> */
fac6795d 317
5eb91c98
DG
318 if (is_root) {
319 DBG("Removing %s directory", LTTNG_RUNDIR);
320 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
321 if (ret < 0) {
322 ERR("asprintf failed. Something is really wrong!");
323 }
5461b305 324
5eb91c98
DG
325 /* Remove lttng run directory */
326 ret = system(cmd);
327 if (ret < 0) {
328 ERR("Unable to clean " LTTNG_RUNDIR);
329 }
1d4b027a 330 }
5461b305 331
1d4b027a 332 DBG("Cleaning up all session");
fac6795d 333
b5541356 334 /* Destroy session list mutex */
273ea72c
DG
335 if (session_list_ptr != NULL) {
336 pthread_mutex_destroy(&session_list_ptr->lock);
337
338 /* Cleanup ALL session */
54d01ffb
DG
339 cds_list_for_each_entry_safe(sess, stmp,
340 &session_list_ptr->head, list) {
273ea72c
DG
341 teardown_kernel_session(sess);
342 // TODO complete session cleanup (including UST)
343 }
344 }
345
099e26bd 346 DBG("Closing all UST sockets");
56fff090 347 ust_app_clean_list();
099e26bd 348
273ea72c 349 pthread_mutex_destroy(&kconsumerd_pid_mutex);
b5541356 350
f3ed775e 351 DBG("Closing kernel fd");
1d4b027a 352 close(kernel_tracer_fd);
ab147185 353
2f50c8a3
DG
354 if (is_root) {
355 DBG("Unloading kernel modules");
356 modprobe_remove_kernel_modules();
357 }
5eb91c98
DG
358
359 close(thread_quit_pipe[0]);
360 close(thread_quit_pipe[1]);
fac6795d
DG
361}
362
e065084a 363/*
d063d709 364 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 365 *
d063d709 366 * Return lttcomm error code.
e065084a
DG
367 */
368static int send_unix_sock(int sock, void *buf, size_t len)
369{
370 /* Check valid length */
371 if (len <= 0) {
372 return -1;
373 }
374
375 return lttcomm_send_unix_sock(sock, buf, len);
376}
377
5461b305 378/*
d063d709 379 * Free memory of a command context structure.
5461b305 380 */
a2fb29a5 381static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 382{
a2fb29a5
DG
383 DBG("Clean command context structure");
384 if (*cmd_ctx) {
385 if ((*cmd_ctx)->llm) {
386 free((*cmd_ctx)->llm);
5461b305 387 }
a2fb29a5
DG
388 if ((*cmd_ctx)->lsm) {
389 free((*cmd_ctx)->lsm);
5461b305 390 }
a2fb29a5
DG
391 free(*cmd_ctx);
392 *cmd_ctx = NULL;
5461b305
DG
393 }
394}
395
f3ed775e 396/*
d063d709 397 * Send all stream fds of kernel channel to the consumer.
f3ed775e 398 */
54d01ffb
DG
399static int send_kconsumerd_channel_fds(int sock,
400 struct ltt_kernel_channel *channel)
f3ed775e
DG
401{
402 int ret;
403 size_t nb_fd;
404 struct ltt_kernel_stream *stream;
f3ed775e
DG
405 struct lttcomm_kconsumerd_header lkh;
406 struct lttcomm_kconsumerd_msg lkm;
407
54d01ffb
DG
408 DBG("Sending fds of channel %s to kernel consumer",
409 channel->channel->name);
7a485870
DG
410
411 nb_fd = channel->stream_count;
f3ed775e
DG
412
413 /* Setup header */
7a485870 414 lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg);
f3ed775e
DG
415 lkh.cmd_type = ADD_STREAM;
416
417 DBG("Sending kconsumerd header");
418
54d01ffb
DG
419 ret = lttcomm_send_unix_sock(sock, &lkh,
420 sizeof(struct lttcomm_kconsumerd_header));
f3ed775e
DG
421 if (ret < 0) {
422 perror("send kconsumerd header");
423 goto error;
424 }
425
7a485870
DG
426 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
427 if (stream->fd != 0) {
f3ed775e
DG
428 lkm.fd = stream->fd;
429 lkm.state = stream->state;
7a485870 430 lkm.max_sb_size = channel->channel->attr.subbuf_size;
e8b60857 431 lkm.output = channel->channel->attr.output;
f3ed775e 432 strncpy(lkm.path_name, stream->pathname, PATH_MAX);
99497cd0 433 lkm.path_name[PATH_MAX - 1] = '\0';
f3ed775e
DG
434
435 DBG("Sending fd %d to kconsumerd", lkm.fd);
436
54d01ffb
DG
437 ret = lttcomm_send_fds_unix_sock(sock, &lkm,
438 &lkm.fd, 1, sizeof(lkm));
f3ed775e
DG
439 if (ret < 0) {
440 perror("send kconsumerd fd");
441 goto error;
442 }
443 }
444 }
445
7a485870 446 DBG("Kconsumerd channel fds sent");
f3ed775e
DG
447
448 return 0;
449
450error:
451 return ret;
452}
453
454/*
d063d709 455 * Send all stream fds of the kernel session to the consumer.
f3ed775e 456 */
d9800920 457static int send_kconsumerd_fds(struct ltt_kernel_session *session)
f3ed775e
DG
458{
459 int ret;
460 struct ltt_kernel_channel *chan;
7a485870
DG
461 struct lttcomm_kconsumerd_header lkh;
462 struct lttcomm_kconsumerd_msg lkm;
463
464 /* Setup header */
465 lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg);
466 lkh.cmd_type = ADD_STREAM;
467
468 DBG("Sending kconsumerd header for metadata");
469
54d01ffb
DG
470 ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh,
471 sizeof(struct lttcomm_kconsumerd_header));
7a485870
DG
472 if (ret < 0) {
473 perror("send kconsumerd header");
474 goto error;
475 }
476
477 DBG("Sending metadata stream fd");
478
d9800920
DG
479 /* Extra protection. It's NOT suppose to be set to 0 at this point */
480 if (session->consumer_fd == 0) {
481 session->consumer_fd = kconsumerd_cmd_sock;
482 }
483
7a485870
DG
484 if (session->metadata_stream_fd != 0) {
485 /* Send metadata stream fd first */
486 lkm.fd = session->metadata_stream_fd;
487 lkm.state = ACTIVE_FD;
488 lkm.max_sb_size = session->metadata->conf->attr.subbuf_size;
8b270bdb 489 lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
7a485870 490 strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
99497cd0 491 lkm.path_name[PATH_MAX - 1] = '\0';
7a485870 492
54d01ffb
DG
493 ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm,
494 &lkm.fd, 1, sizeof(lkm));
7a485870
DG
495 if (ret < 0) {
496 perror("send kconsumerd fd");
497 goto error;
498 }
499 }
f3ed775e 500
f3ed775e 501 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
d9800920 502 ret = send_kconsumerd_channel_fds(session->consumer_fd, chan);
f3ed775e 503 if (ret < 0) {
7a485870 504 goto error;
f3ed775e
DG
505 }
506 }
507
7a485870
DG
508 DBG("Kconsumerd fds (metadata and channel streams) sent");
509
f3ed775e
DG
510 return 0;
511
512error:
513 return ret;
514}
515
fac6795d 516/*
0fdd1e2c 517 * Notify UST applications using the shm mmap futex.
fac6795d 518 */
0fdd1e2c 519static int notify_ust_apps(int active)
fac6795d 520{
0fdd1e2c 521 char *wait_shm_mmap;
fac6795d 522
0fdd1e2c 523 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 524
0fdd1e2c
DG
525 /* See shm.c for this call implying mmap, shm and futex calls */
526 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
527 if (wait_shm_mmap == NULL) {
fac6795d
DG
528 goto error;
529 }
530
0fdd1e2c
DG
531 /* Wake waiting process */
532 futex_wait_update((int32_t *) wait_shm_mmap, active);
533
534 /* Apps notified successfully */
535 return 0;
fac6795d
DG
536
537error:
0fdd1e2c 538 return -1;
fac6795d
DG
539}
540
e065084a 541/*
d063d709
DG
542 * Setup the outgoing data buffer for the response (llm) by allocating the
543 * right amount of memory and copying the original information from the lsm
544 * structure.
ca95a216 545 *
d063d709 546 * Return total size of the buffer pointed by buf.
ca95a216 547 */
5461b305 548static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 549{
f3ed775e 550 int ret, buf_size;
ca95a216 551
f3ed775e 552 buf_size = size;
5461b305
DG
553
554 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
555 if (cmd_ctx->llm == NULL) {
ca95a216 556 perror("malloc");
5461b305 557 ret = -ENOMEM;
ca95a216
DG
558 goto error;
559 }
560
5461b305
DG
561 /* Copy common data */
562 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 563 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 564
5461b305
DG
565 cmd_ctx->llm->data_size = size;
566 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
567
ca95a216
DG
568 return buf_size;
569
570error:
571 return ret;
572}
573
7a485870 574/*
5eb91c98 575 * Update the kernel poll set of all channel fd available over all tracing
d063d709 576 * session. Add the wakeup pipe at the end of the set.
7a485870 577 */
5eb91c98 578static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 579{
5eb91c98 580 int ret;
7a485870
DG
581 struct ltt_session *session;
582 struct ltt_kernel_channel *channel;
583
5eb91c98 584 DBG("Updating kernel poll set");
7a485870 585
54d01ffb 586 session_lock_list();
b5541356 587 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 588 session_lock(session);
7a485870 589 if (session->kernel_session == NULL) {
54d01ffb 590 session_unlock(session);
7a485870
DG
591 continue;
592 }
7a485870 593
54d01ffb
DG
594 cds_list_for_each_entry(channel,
595 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
596 /* Add channel fd to the kernel poll set */
597 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
598 if (ret < 0) {
54d01ffb 599 session_unlock(session);
5eb91c98
DG
600 goto error;
601 }
602 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 603 }
54d01ffb 604 session_unlock(session);
7a485870 605 }
54d01ffb 606 session_unlock_list();
7a485870 607
5eb91c98 608 return 0;
7a485870
DG
609
610error:
54d01ffb 611 session_unlock_list();
7a485870
DG
612 return -1;
613}
614
615/*
54d01ffb 616 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 617 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 618 *
d063d709 619 * Useful for CPU hotplug feature.
7a485870
DG
620 */
621static int update_kernel_stream(int fd)
622{
623 int ret = 0;
624 struct ltt_session *session;
625 struct ltt_kernel_channel *channel;
626
627 DBG("Updating kernel streams for channel fd %d", fd);
628
54d01ffb 629 session_lock_list();
b5541356 630 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 631 session_lock(session);
7a485870 632 if (session->kernel_session == NULL) {
54d01ffb 633 session_unlock(session);
7a485870
DG
634 continue;
635 }
d9800920
DG
636
637 /* This is not suppose to be 0 but this is an extra security check */
638 if (session->kernel_session->consumer_fd == 0) {
639 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
640 }
641
5eb91c98
DG
642 cds_list_for_each_entry(channel,
643 &session->kernel_session->channel_list.head, list) {
7a485870
DG
644 if (channel->fd == fd) {
645 DBG("Channel found, updating kernel streams");
646 ret = kernel_open_channel_stream(channel);
647 if (ret < 0) {
b3c750d2 648 goto error;
7a485870 649 }
d9800920 650
7a485870 651 /*
5eb91c98
DG
652 * Have we already sent fds to the consumer? If yes, it means
653 * that tracing is started so it is safe to send our updated
654 * stream fds.
7a485870
DG
655 */
656 if (session->kernel_session->kconsumer_fds_sent == 1) {
5eb91c98
DG
657 ret = send_kconsumerd_channel_fds(
658 session->kernel_session->consumer_fd, channel);
7a485870 659 if (ret < 0) {
b3c750d2 660 goto error;
7a485870
DG
661 }
662 }
b3c750d2 663 goto error;
7a485870
DG
664 }
665 }
54d01ffb 666 session_unlock(session);
7a485870 667 }
54d01ffb 668 session_unlock_list();
b3c750d2 669 return ret;
7a485870 670
b3c750d2 671error:
54d01ffb
DG
672 session_unlock(session);
673 session_unlock_list();
7a485870
DG
674 return ret;
675}
676
677/*
d063d709 678 * This thread manage event coming from the kernel.
7a485870 679 *
d063d709
DG
680 * Features supported in this thread:
681 * -) CPU Hotplug
7a485870
DG
682 */
683static void *thread_manage_kernel(void *data)
684{
5eb91c98
DG
685 int ret, i, pollfd, update_poll_flag = 1;
686 uint32_t revents, nb_fd;
7a485870 687 char tmp;
5eb91c98 688 struct lttng_poll_event events;
7a485870
DG
689
690 DBG("Thread manage kernel started");
691
5eb91c98
DG
692 ret = create_thread_poll_set(&events, 2);
693 if (ret < 0) {
694 goto error;
695 }
696
697 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
698 if (ret < 0) {
699 goto error;
700 }
701
7a485870
DG
702 while (1) {
703 if (update_poll_flag == 1) {
5f822d0a
DG
704 /*
705 * Reset number of fd in the poll set. Always 2 since there is the thread
706 * quit pipe and the kernel pipe.
707 */
708 events.nb_fd = 2;
709
5eb91c98
DG
710 ret = update_kernel_poll(&events);
711 if (ret < 0) {
7a485870
DG
712 goto error;
713 }
714 update_poll_flag = 0;
715 }
716
5eb91c98
DG
717 nb_fd = LTTNG_POLL_GETNB(&events);
718
719 DBG("Thread kernel polling on %d fds", nb_fd);
720
721 /* Zeroed the poll events */
722 lttng_poll_reset(&events);
7a485870
DG
723
724 /* Poll infinite value of time */
5eb91c98 725 ret = lttng_poll_wait(&events, -1);
7a485870 726 if (ret < 0) {
7a485870
DG
727 goto error;
728 } else if (ret == 0) {
729 /* Should not happen since timeout is infinite */
85611738
DG
730 ERR("Return value of poll is 0 with an infinite timeout.\n"
731 "This should not have happened! Continuing...");
7a485870
DG
732 continue;
733 }
734
5eb91c98
DG
735 for (i = 0; i < nb_fd; i++) {
736 /* Fetch once the poll data */
737 revents = LTTNG_POLL_GETEV(&events, i);
738 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 739
5eb91c98
DG
740 /* Thread quit pipe has been closed. Killing thread. */
741 ret = check_thread_quit_pipe(pollfd, revents);
742 if (ret) {
743 goto error;
744 }
7a485870 745
5eb91c98
DG
746 /* Check for data on kernel pipe */
747 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
748 ret = read(kernel_poll_pipe[0], &tmp, 1);
749 update_poll_flag = 1;
750 continue;
751 } else {
752 /*
753 * New CPU detected by the kernel. Adding kernel stream to
754 * kernel session and updating the kernel consumer
755 */
756 if (revents & LPOLLIN) {
757 ret = update_kernel_stream(pollfd);
758 if (ret < 0) {
759 continue;
760 }
761 break;
762 /*
763 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
764 * and unregister kernel stream at this point.
765 */
7a485870 766 }
7a485870
DG
767 }
768 }
769 }
770
771error:
772 DBG("Kernel thread dying");
273ea72c
DG
773 close(kernel_poll_pipe[0]);
774 close(kernel_poll_pipe[1]);
5eb91c98
DG
775
776 lttng_poll_clean(&events);
777
7a485870
DG
778 return NULL;
779}
780
1d4b027a 781/*
d063d709 782 * This thread manage the kconsumerd error sent back to the session daemon.
1d4b027a
DG
783 */
784static void *thread_manage_kconsumerd(void *data)
785{
5eb91c98
DG
786 int sock = 0, i, ret, pollfd;
787 uint32_t revents, nb_fd;
1d4b027a 788 enum lttcomm_return_code code;
5eb91c98 789 struct lttng_poll_event events;
1d4b027a
DG
790
791 DBG("[thread] Manage kconsumerd started");
792
793 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
794 if (ret < 0) {
795 goto error;
796 }
797
5eb91c98
DG
798 /*
799 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
800 * Nothing more will be added to this poll set.
801 */
802 ret = create_thread_poll_set(&events, 2);
803 if (ret < 0) {
804 goto error;
805 }
273ea72c 806
5eb91c98
DG
807 ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP);
808 if (ret < 0) {
809 goto error;
810 }
811
812 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
813
814 /* Inifinite blocking call, waiting for transmission */
5eb91c98 815 ret = lttng_poll_wait(&events, -1);
273ea72c 816 if (ret < 0) {
273ea72c
DG
817 goto error;
818 }
819
5eb91c98
DG
820 for (i = 0; i < nb_fd; i++) {
821 /* Fetch once the poll data */
822 revents = LTTNG_POLL_GETEV(&events, i);
823 pollfd = LTTNG_POLL_GETFD(&events, i);
824
825 /* Thread quit pipe has been closed. Killing thread. */
826 ret = check_thread_quit_pipe(pollfd, revents);
827 if (ret) {
828 goto error;
829 }
830
831 /* Event on the registration socket */
832 if (pollfd == kconsumerd_err_sock) {
833 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
834 ERR("Kconsumerd err socket poll error");
835 goto error;
836 }
837 }
273ea72c
DG
838 }
839
1d4b027a
DG
840 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
841 if (sock < 0) {
842 goto error;
843 }
844
ee0b0061
DG
845 DBG2("Receiving code from kconsumerd_err_sock");
846
712ea556 847 /* Getting status code from kconsumerd */
54d01ffb
DG
848 ret = lttcomm_recv_unix_sock(sock, &code,
849 sizeof(enum lttcomm_return_code));
1d4b027a
DG
850 if (ret <= 0) {
851 goto error;
852 }
853
854 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
54d01ffb
DG
855 kconsumerd_cmd_sock =
856 lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
1d4b027a 857 if (kconsumerd_cmd_sock < 0) {
712ea556 858 sem_post(&kconsumerd_sem);
1d4b027a
DG
859 perror("kconsumerd connect");
860 goto error;
861 }
862 /* Signal condition to tell that the kconsumerd is ready */
863 sem_post(&kconsumerd_sem);
864 DBG("Kconsumerd command socket ready");
865 } else {
ee0b0061 866 ERR("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG
867 lttcomm_get_readable_code(-code));
868 goto error;
869 }
870
54d01ffb 871 /* Remove the kconsumerd error sock since we've established a connexion */
5eb91c98 872 ret = lttng_poll_del(&events, kconsumerd_err_sock);
72079cae 873 if (ret < 0) {
72079cae
DG
874 goto error;
875 }
876
5eb91c98
DG
877 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
878 if (ret < 0) {
72079cae 879 goto error;
5eb91c98
DG
880 }
881
882 /* Update number of fd */
883 nb_fd = LTTNG_POLL_GETNB(&events);
884
885 /* Inifinite blocking call, waiting for transmission */
886 ret = lttng_poll_wait(&events, -1);
887 if (ret < 0) {
72079cae
DG
888 goto error;
889 }
890
5eb91c98
DG
891 for (i = 0; i < nb_fd; i++) {
892 /* Fetch once the poll data */
893 revents = LTTNG_POLL_GETEV(&events, i);
894 pollfd = LTTNG_POLL_GETFD(&events, i);
895
896 /* Thread quit pipe has been closed. Killing thread. */
897 ret = check_thread_quit_pipe(pollfd, revents);
898 if (ret) {
899 goto error;
900 }
901
902 /* Event on the kconsumerd socket */
903 if (pollfd == sock) {
904 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
905 ERR("Kconsumerd err socket second poll error");
906 goto error;
907 }
908 }
909 }
910
712ea556 911 /* Wait for any kconsumerd error */
54d01ffb
DG
912 ret = lttcomm_recv_unix_sock(sock, &code,
913 sizeof(enum lttcomm_return_code));
712ea556
DG
914 if (ret <= 0) {
915 ERR("Kconsumerd closed the command socket");
916 goto error;
6f61d021 917 }
1d4b027a 918
712ea556
DG
919 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
920
1d4b027a 921error:
6f61d021 922 DBG("Kconsumerd thread dying");
5eb91c98
DG
923 close(kconsumerd_err_sock);
924 close(kconsumerd_cmd_sock);
925 close(sock);
273ea72c
DG
926
927 unlink(kconsumerd_err_unix_sock_path);
928 unlink(kconsumerd_cmd_unix_sock_path);
273ea72c 929 kconsumerd_pid = 0;
1d4b027a 930
5eb91c98 931 lttng_poll_clean(&events);
0177d773 932
5eb91c98 933 return NULL;
099e26bd
DG
934}
935
099e26bd
DG
936/*
937 * This thread manage application communication.
1d4b027a
DG
938 */
939static void *thread_manage_apps(void *data)
099e26bd 940{
5eb91c98
DG
941 int i, ret, pollfd;
942 uint32_t revents, nb_fd;
099e26bd 943 struct ust_command ust_cmd;
5eb91c98 944 struct lttng_poll_event events;
099e26bd
DG
945
946 DBG("[thread] Manage application started");
947
5eb91c98
DG
948 ret = create_thread_poll_set(&events, 2);
949 if (ret < 0) {
950 goto error;
951 }
099e26bd 952
5eb91c98
DG
953 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
954 if (ret < 0) {
955 goto error;
956 }
099e26bd 957
5eb91c98
DG
958 while (1) {
959 /* Zeroed the events structure */
960 lttng_poll_reset(&events);
0177d773 961
5eb91c98 962 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
963
964 DBG("Apps thread polling on %d fds", nb_fd);
965
966 /* Inifinite blocking call, waiting for transmission */
5eb91c98 967 ret = lttng_poll_wait(&events, -1);
099e26bd 968 if (ret < 0) {
099e26bd
DG
969 goto error;
970 }
971
5eb91c98
DG
972 for (i = 0; i < nb_fd; i++) {
973 /* Fetch once the poll data */
974 revents = LTTNG_POLL_GETEV(&events, i);
975 pollfd = LTTNG_POLL_GETFD(&events, i);
976
977 /* Thread quit pipe has been closed. Killing thread. */
978 ret = check_thread_quit_pipe(pollfd, revents);
979 if (ret) {
099e26bd 980 goto error;
5eb91c98 981 }
099e26bd 982
5eb91c98
DG
983 /* Inspect the apps cmd pipe */
984 if (pollfd == apps_cmd_pipe[0]) {
985 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
986 ERR("Apps command pipe error");
0177d773 987 goto error;
5eb91c98
DG
988 } else if (revents & LPOLLIN) {
989 /* Empty pipe */
990 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
991 if (ret < 0 || ret < sizeof(ust_cmd)) {
992 perror("read apps cmd pipe");
993 goto error;
994 }
099e26bd 995
5eb91c98 996 /* Register applicaton to the session daemon */
56fff090 997 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 998 ust_cmd.sock);
5eb91c98
DG
999 if (ret < 0) {
1000 /* Only critical ENOMEM error can be returned here */
1001 goto error;
1002 }
1003
1004 ret = ustctl_register_done(ust_cmd.sock);
1005 if (ret < 0) {
1006 /*
1007 * If the registration is not possible, we simply
1008 * unregister the apps and continue
1009 */
56fff090 1010 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1011 } else {
1012 /*
1013 * We just need here to monitor the close of the UST
1014 * socket and poll set monitor those by default.
1015 */
1016 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1017 if (ret < 0) {
1018 goto error;
1019 }
1020
54d01ffb
DG
1021 DBG("Apps with sock %d added to poll set",
1022 ust_cmd.sock);
5eb91c98
DG
1023 }
1024 break;
0177d773 1025 }
5eb91c98
DG
1026 } else {
1027 /*
54d01ffb
DG
1028 * At this point, we know that a registered application made
1029 * the event at poll_wait.
5eb91c98
DG
1030 */
1031 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1032 /* Removing from the poll set */
1033 ret = lttng_poll_del(&events, pollfd);
1034 if (ret < 0) {
1035 goto error;
1036 }
099e26bd 1037
5eb91c98 1038 /* Socket closed */
56fff090 1039 ust_app_unregister(pollfd);
5eb91c98
DG
1040 break;
1041 }
099e26bd
DG
1042 }
1043 }
099e26bd
DG
1044 }
1045
1046error:
1047 DBG("Application communication apps dying");
1048 close(apps_cmd_pipe[0]);
1049 close(apps_cmd_pipe[1]);
1050
5eb91c98 1051 lttng_poll_clean(&events);
099e26bd
DG
1052
1053 return NULL;
1054}
1055
1056/*
1057 * Dispatch request from the registration threads to the application
1058 * communication thread.
1059 */
1060static void *thread_dispatch_ust_registration(void *data)
1061{
1062 int ret;
1063 struct cds_wfq_node *node;
1064 struct ust_command *ust_cmd = NULL;
1065
1066 DBG("[thread] Dispatch UST command started");
1067
1068 while (!dispatch_thread_exit) {
1069 /* Atomically prepare the queue futex */
1070 futex_nto1_prepare(&ust_cmd_queue.futex);
1071
1072 do {
1073 /* Dequeue command for registration */
1074 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1075 if (node == NULL) {
1076 DBG("Waked up but nothing in the UST command queue");
1077 /* Continue thread execution */
1078 break;
1079 }
1080
1081 ust_cmd = caa_container_of(node, struct ust_command, node);
1082
2f50c8a3
DG
1083 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1084 " gid:%d sock:%d name:%s (version %d.%d)",
1085 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1086 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1087 ust_cmd->sock, ust_cmd->reg_msg.name,
1088 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1089 /*
1090 * Inform apps thread of the new application registration. This
1091 * call is blocking so we can be assured that the data will be read
1092 * at some point in time or wait to the end of the world :)
1093 */
1094 ret = write(apps_cmd_pipe[1], ust_cmd,
1095 sizeof(struct ust_command));
1096 if (ret < 0) {
1097 perror("write apps cmd pipe");
1098 if (errno == EBADF) {
1099 /*
1100 * We can't inform the application thread to process
1101 * registration. We will exit or else application
1102 * registration will not occur and tracing will never
1103 * start.
1104 */
1105 goto error;
1106 }
1107 }
1108 free(ust_cmd);
1109 } while (node != NULL);
1110
1111 /* Futex wait on queue. Blocking call on futex() */
1112 futex_nto1_wait(&ust_cmd_queue.futex);
1113 }
1114
1115error:
1116 DBG("Dispatch thread dying");
1117 return NULL;
1118}
1119
1120/*
1121 * This thread manage application registration.
1122 */
1123static void *thread_registration_apps(void *data)
1d4b027a 1124{
5eb91c98
DG
1125 int sock = 0, i, ret, pollfd;
1126 uint32_t revents, nb_fd;
1127 struct lttng_poll_event events;
099e26bd
DG
1128 /*
1129 * Get allocated in this thread, enqueued to a global queue, dequeued and
1130 * freed in the manage apps thread.
1131 */
1132 struct ust_command *ust_cmd = NULL;
1d4b027a 1133
099e26bd 1134 DBG("[thread] Manage application registration started");
1d4b027a
DG
1135
1136 ret = lttcomm_listen_unix_sock(apps_sock);
1137 if (ret < 0) {
1138 goto error;
1139 }
1140
5eb91c98
DG
1141 /*
1142 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1143 * more will be added to this poll set.
1144 */
1145 ret = create_thread_poll_set(&events, 2);
1146 if (ret < 0) {
1147 goto error;
1148 }
273ea72c 1149
5eb91c98
DG
1150 /* Add the application registration socket */
1151 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1152 if (ret < 0) {
1153 goto error;
1154 }
273ea72c 1155
1d4b027a 1156 /* Notify all applications to register */
0fdd1e2c
DG
1157 ret = notify_ust_apps(1);
1158 if (ret < 0) {
1159 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1160 "Execution continues but there might be problem for already\n"
1161 "running applications that wishes to register.");
0fdd1e2c 1162 }
1d4b027a
DG
1163
1164 while (1) {
1165 DBG("Accepting application registration");
273ea72c 1166
5eb91c98
DG
1167 nb_fd = LTTNG_POLL_GETNB(&events);
1168
273ea72c 1169 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1170 ret = lttng_poll_wait(&events, -1);
273ea72c 1171 if (ret < 0) {
273ea72c
DG
1172 goto error;
1173 }
1174
5eb91c98
DG
1175 for (i = 0; i < nb_fd; i++) {
1176 /* Fetch once the poll data */
1177 revents = LTTNG_POLL_GETEV(&events, i);
1178 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1179
5eb91c98
DG
1180 /* Thread quit pipe has been closed. Killing thread. */
1181 ret = check_thread_quit_pipe(pollfd, revents);
1182 if (ret) {
90014c57
DG
1183 goto error;
1184 }
1d4b027a 1185
5eb91c98
DG
1186 /* Event on the registration socket */
1187 if (pollfd == apps_sock) {
1188 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1189 ERR("Register apps socket poll error");
1190 goto error;
1191 } else if (revents & LPOLLIN) {
1192 sock = lttcomm_accept_unix_sock(apps_sock);
1193 if (sock < 0) {
1194 goto error;
1195 }
099e26bd 1196
5eb91c98
DG
1197 /* Create UST registration command for enqueuing */
1198 ust_cmd = malloc(sizeof(struct ust_command));
1199 if (ust_cmd == NULL) {
1200 perror("ust command malloc");
1201 goto error;
1202 }
1d4b027a 1203
5eb91c98
DG
1204 /*
1205 * Using message-based transmissions to ensure we don't
1206 * have to deal with partially received messages.
1207 */
1208 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1209 sizeof(struct ust_register_msg));
1210 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1211 if (ret < 0) {
1212 perror("lttcomm_recv_unix_sock register apps");
1213 } else {
1214 ERR("Wrong size received on apps register");
1215 }
1216 free(ust_cmd);
1217 close(sock);
1218 continue;
1219 }
099e26bd 1220
5eb91c98 1221 ust_cmd->sock = sock;
099e26bd 1222
5eb91c98
DG
1223 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1224 " gid:%d sock:%d name:%s (version %d.%d)",
1225 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1226 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1227 ust_cmd->sock, ust_cmd->reg_msg.name,
1228 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1229
5eb91c98
DG
1230 /*
1231 * Lock free enqueue the registration request. The red pill
54d01ffb 1232 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1233 */
1234 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1235
1236 /*
1237 * Wake the registration queue futex. Implicit memory
1238 * barrier with the exchange in cds_wfq_enqueue.
1239 */
1240 futex_nto1_wake(&ust_cmd_queue.futex);
1241 }
1242 }
90014c57 1243 }
1d4b027a
DG
1244 }
1245
1246error:
0fdd1e2c
DG
1247 DBG("UST Registration thread dying");
1248
1249 /* Notify that the registration thread is gone */
1250 notify_ust_apps(0);
1251
1252 close(apps_sock);
1253 close(sock);
273ea72c 1254 unlink(apps_unix_sock_path);
0fdd1e2c 1255
5eb91c98
DG
1256 lttng_poll_clean(&events);
1257
1d4b027a
DG
1258 return NULL;
1259}
1260
8c0faa1d 1261/*
d063d709
DG
1262 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
1263 * exec or it will fails.
8c0faa1d 1264 */
693bd40b 1265static int spawn_kconsumerd_thread(void)
8c0faa1d
DG
1266{
1267 int ret;
ee0b0061
DG
1268 struct timespec timeout;
1269
1270 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1271 timeout.tv_nsec = 0;
8c0faa1d
DG
1272
1273 /* Setup semaphore */
ee0b0061
DG
1274 ret = sem_init(&kconsumerd_sem, 0, 0);
1275 if (ret < 0) {
1276 PERROR("sem_init kconsumerd_sem");
1277 goto error;
1278 }
8c0faa1d 1279
54d01ffb
DG
1280 ret = pthread_create(&kconsumerd_thread, NULL,
1281 thread_manage_kconsumerd, (void *) NULL);
8c0faa1d 1282 if (ret != 0) {
ee0b0061
DG
1283 PERROR("pthread_create kconsumerd");
1284 ret = -1;
8c0faa1d
DG
1285 goto error;
1286 }
1287
ee0b0061
DG
1288 /* Get time for sem_timedwait absolute timeout */
1289 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1290 if (ret < 0) {
1291 PERROR("clock_gettime spawn kconsumerd");
1292 /* Infinite wait for the kconsumerd thread to be ready */
1293 ret = sem_wait(&kconsumerd_sem);
1294 } else {
1295 /* Normal timeout if the gettime was successful */
1296 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1297 ret = sem_timedwait(&kconsumerd_sem, &timeout);
1298 }
8c0faa1d 1299
ee0b0061
DG
1300 if (ret < 0) {
1301 if (errno == ETIMEDOUT) {
1302 /*
1303 * Call has timed out so we kill the kconsumerd_thread and return
1304 * an error.
1305 */
1306 ERR("The kconsumerd thread was never ready. Killing it");
1307 ret = pthread_cancel(kconsumerd_thread);
1308 if (ret < 0) {
1309 PERROR("pthread_cancel kconsumerd_thread");
1310 }
1311 } else {
1312 PERROR("semaphore wait failed kconsumerd thread");
1313 }
1314 goto error;
1315 }
1316
1317 pthread_mutex_lock(&kconsumerd_pid_mutex);
712ea556
DG
1318 if (kconsumerd_pid == 0) {
1319 ERR("Kconsumerd did not start");
ee0b0061 1320 pthread_mutex_unlock(&kconsumerd_pid_mutex);
712ea556
DG
1321 goto error;
1322 }
ee0b0061 1323 pthread_mutex_unlock(&kconsumerd_pid_mutex);
712ea556 1324
8c0faa1d
DG
1325 return 0;
1326
1327error:
1328 return ret;
1329}
1330
d9800920
DG
1331/*
1332 * Join kernel consumer thread
1333 */
cf3af59e
MD
1334static int join_kconsumerd_thread(void)
1335{
1336 void *status;
1337 int ret;
1338
1339 if (kconsumerd_pid != 0) {
1340 ret = kill(kconsumerd_pid, SIGTERM);
1341 if (ret) {
1342 ERR("Error killing kconsumerd");
1343 return ret;
1344 }
1345 return pthread_join(kconsumerd_thread, &status);
1346 } else {
1347 return 0;
1348 }
1349}
1350
8c0faa1d 1351/*
d063d709 1352 * Fork and exec a kernel consumer daemon (kconsumerd).
8c0faa1d 1353 *
d063d709 1354 * Return pid if successful else -1.
8c0faa1d 1355 */
693bd40b 1356static pid_t spawn_kconsumerd(void)
8c0faa1d
DG
1357{
1358 int ret;
1359 pid_t pid;
53086306 1360 const char *verbosity;
8c0faa1d 1361
c49dc785
DG
1362 DBG("Spawning kconsumerd");
1363
8c0faa1d
DG
1364 pid = fork();
1365 if (pid == 0) {
1366 /*
1367 * Exec kconsumerd.
1368 */
31f73cc9 1369 if (opt_verbose > 1 || opt_verbose_kconsumerd) {
53086306
DG
1370 verbosity = "--verbose";
1371 } else {
1372 verbosity = "--quiet";
1373 }
54d01ffb
DG
1374 execl(INSTALL_BIN_PATH "/ltt-kconsumerd",
1375 "ltt-kconsumerd", verbosity, NULL);
8c0faa1d
DG
1376 if (errno != 0) {
1377 perror("kernel start consumer exec");
1378 }
1379 exit(EXIT_FAILURE);
1380 } else if (pid > 0) {
1381 ret = pid;
1382 goto error;
1383 } else {
1384 perror("kernel start consumer fork");
1385 ret = -errno;
1386 goto error;
1387 }
1388
1389error:
1390 return ret;
1391}
1392
693bd40b 1393/*
d063d709 1394 * Spawn the kconsumerd daemon and session daemon thread.
693bd40b
DG
1395 */
1396static int start_kconsumerd(void)
1397{
1398 int ret;
1399
693bd40b 1400 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785 1401 if (kconsumerd_pid != 0) {
817153bb 1402 pthread_mutex_unlock(&kconsumerd_pid_mutex);
c49dc785
DG
1403 goto end;
1404 }
693bd40b 1405
c49dc785
DG
1406 ret = spawn_kconsumerd();
1407 if (ret < 0) {
1408 ERR("Spawning kconsumerd failed");
c49dc785
DG
1409 pthread_mutex_unlock(&kconsumerd_pid_mutex);
1410 goto error;
693bd40b 1411 }
c49dc785
DG
1412
1413 /* Setting up the global kconsumerd_pid */
1414 kconsumerd_pid = ret;
ee0b0061 1415 DBG2("Kconsumerd pid %d", kconsumerd_pid);
693bd40b
DG
1416 pthread_mutex_unlock(&kconsumerd_pid_mutex);
1417
ee0b0061 1418 DBG2("Spawning kconsumerd thread");
693bd40b
DG
1419 ret = spawn_kconsumerd_thread();
1420 if (ret < 0) {
1421 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG
1422 goto error;
1423 }
1424
c49dc785 1425end:
693bd40b
DG
1426 return 0;
1427
1428error:
1429 return ret;
1430}
1431
b73401da 1432/*
d063d709 1433 * modprobe_kernel_modules
b73401da
DG
1434 */
1435static int modprobe_kernel_modules(void)
1436{
ab147185 1437 int ret = 0, i;
b73401da
DG
1438 char modprobe[256];
1439
ab147185
MD
1440 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1441 ret = snprintf(modprobe, sizeof(modprobe),
1442 "/sbin/modprobe %s%s",
1443 kernel_modules_list[i].required ? "" : "--quiet ",
1444 kernel_modules_list[i].name);
b73401da
DG
1445 if (ret < 0) {
1446 perror("snprintf modprobe");
1447 goto error;
1448 }
ab147185 1449 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1450 ret = system(modprobe);
ab147185
MD
1451 if (ret == -1) {
1452 ERR("Unable to launch modprobe for module %s",
1453 kernel_modules_list[i].name);
1454 } else if (kernel_modules_list[i].required
d9800920 1455 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1456 ERR("Unable to load module %s",
1457 kernel_modules_list[i].name);
1458 } else {
1459 DBG("Modprobe successfully %s",
1460 kernel_modules_list[i].name);
1461 }
1462 }
1463
1464error:
1465 return ret;
1466}
1467
b73401da 1468/*
d063d709 1469 * mount_debugfs
b73401da
DG
1470 */
1471static int mount_debugfs(char *path)
1472{
1473 int ret;
1474 char *type = "debugfs";
1475
996b65c8 1476 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1477 if (ret < 0) {
7272acf5 1478 PERROR("Cannot create debugfs path");
b73401da
DG
1479 goto error;
1480 }
1481
1482 ret = mount(type, path, type, 0, NULL);
1483 if (ret < 0) {
7272acf5 1484 PERROR("Cannot mount debugfs");
b73401da
DG
1485 goto error;
1486 }
1487
1488 DBG("Mounted debugfs successfully at %s", path);
1489
1490error:
1491 return ret;
1492}
1493
8c0faa1d 1494/*
d063d709 1495 * Setup necessary data for kernel tracer action.
8c0faa1d 1496 */
f3ed775e 1497static void init_kernel_tracer(void)
8c0faa1d 1498{
b73401da
DG
1499 int ret;
1500 char *proc_mounts = "/proc/mounts";
1501 char line[256];
684d34d2 1502 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1503 FILE *fp;
1504
1505 /* Detect debugfs */
1506 fp = fopen(proc_mounts, "r");
1507 if (fp == NULL) {
1508 ERR("Unable to probe %s", proc_mounts);
1509 goto error;
1510 }
1511
1512 while (fgets(line, sizeof(line), fp) != NULL) {
1513 if (strstr(line, "debugfs") != NULL) {
1514 /* Remove first string */
1515 strtok(line, " ");
1516 /* Dup string here so we can reuse line later on */
1517 debugfs_path = strdup(strtok(NULL, " "));
1518 DBG("Got debugfs path : %s", debugfs_path);
1519 break;
1520 }
1521 }
1522
1523 fclose(fp);
1524
1525 /* Mount debugfs if needded */
1526 if (debugfs_path == NULL) {
1527 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1528 if (ret < 0) {
1529 perror("asprintf debugfs path");
1530 goto error;
1531 }
1532 ret = mount_debugfs(debugfs_path);
1533 if (ret < 0) {
7272acf5 1534 perror("Cannot mount debugfs");
b73401da
DG
1535 goto error;
1536 }
1537 }
1538
1539 /* Modprobe lttng kernel modules */
1540 ret = modprobe_kernel_modules();
1541 if (ret < 0) {
1542 goto error;
1543 }
1544
1545 /* Setup lttng kernel path */
1546 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1547 if (ret < 0) {
1548 perror("asprintf lttng path");
1549 goto error;
1550 }
1551
1552 /* Open debugfs lttng */
1553 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1554 if (kernel_tracer_fd < 0) {
b73401da
DG
1555 DBG("Failed to open %s", lttng_path);
1556 goto error;
8c0faa1d
DG
1557 }
1558
b73401da
DG
1559 free(lttng_path);
1560 free(debugfs_path);
f3ed775e 1561 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1562 return;
1563
1564error:
1565 if (lttng_path) {
1566 free(lttng_path);
1567 }
1568 if (debugfs_path) {
1569 free(debugfs_path);
1570 }
1571 WARN("No kernel tracer available");
1572 kernel_tracer_fd = 0;
1573 return;
f3ed775e 1574}
33a2b854 1575
f3ed775e 1576/*
54d01ffb 1577 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1578 */
54d01ffb 1579static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1580{
f40799e8 1581 int ret = 0;
8c0faa1d 1582
f3ed775e 1583 if (session->kconsumer_fds_sent == 0) {
d9800920 1584 /*
54d01ffb
DG
1585 * Assign default kernel consumer socket if no consumer assigned to the
1586 * kernel session. At this point, it's NOT suppose to be 0 but this is
1587 * an extra security check.
d9800920
DG
1588 */
1589 if (session->consumer_fd == 0) {
1590 session->consumer_fd = kconsumerd_cmd_sock;
1591 }
1592
1593 ret = send_kconsumerd_fds(session);
f3ed775e 1594 if (ret < 0) {
f3ed775e
DG
1595 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1596 goto error;
1597 }
1d4b027a 1598
f3ed775e
DG
1599 session->kconsumer_fds_sent = 1;
1600 }
1d4b027a
DG
1601
1602error:
1603 return ret;
8c0faa1d
DG
1604}
1605
0177d773
DG
1606/*
1607 * Create an UST session and add it to the session ust list.
1608 */
44d3bd01
DG
1609static int create_ust_session(struct ltt_session *session,
1610 struct lttng_domain *domain)
0177d773 1611{
44d3bd01 1612 int ret;
13384287 1613 struct ltt_ust_session *lus = NULL;
56fff090 1614 struct ust_app *app;
44d3bd01
DG
1615
1616 switch (domain->type) {
1617 case LTTNG_DOMAIN_UST_PID:
56fff090 1618 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
1619 if (app == NULL) {
1620 ret = LTTCOMM_APP_NOT_FOUND;
1621 goto error;
1622 }
1623 break;
1624 default:
13384287 1625 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1626 goto error;
1627 }
0177d773
DG
1628
1629 DBG("Creating UST session");
1630
44d3bd01 1631 lus = trace_ust_create_session(session->path, domain->attr.pid, domain);
0177d773 1632 if (lus == NULL) {
44d3bd01 1633 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1634 goto error;
1635 }
1636
1637 ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG,
1638 geteuid(), allowed_group());
1639 if (ret < 0) {
1640 if (ret != -EEXIST) {
1641 ERR("Trace directory creation error");
44d3bd01 1642 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1643 goto error;
1644 }
1645 }
1646
1647 /* Create session on the UST tracer */
44d3bd01 1648 ret = ustctl_create_session(app->sock, lus);
0177d773 1649 if (ret < 0) {
44d3bd01 1650 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1651 goto error;
1652 }
1653
44d3bd01
DG
1654 cds_list_add(&lus->list, &session->ust_session_list.head);
1655 session->ust_session_list.count++;
1656
1657 return LTTCOMM_OK;
0177d773
DG
1658
1659error:
1660 free(lus);
1661 return ret;
1662}
1663
333f285e 1664/*
d063d709 1665 * Create a kernel tracer session then create the default channel.
333f285e 1666 */
f3ed775e 1667static int create_kernel_session(struct ltt_session *session)
333f285e 1668{
f3ed775e 1669 int ret;
f3ed775e
DG
1670
1671 DBG("Creating kernel session");
1672
1673 ret = kernel_create_session(session, kernel_tracer_fd);
1674 if (ret < 0) {
1675 ret = LTTCOMM_KERN_SESS_FAIL;
1676 goto error;
333f285e
DG
1677 }
1678
d9800920
DG
1679 /* Set kernel consumer socket fd */
1680 if (kconsumerd_cmd_sock) {
1681 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
1682 }
1683
63053e7c
DG
1684 ret = mkdir_recursive(session->kernel_session->trace_path,
1685 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1686 if (ret < 0) {
996b65c8 1687 if (ret != -EEXIST) {
7a485870
DG
1688 ERR("Trace directory creation error");
1689 goto error;
1690 }
1691 }
1692
f3ed775e
DG
1693error:
1694 return ret;
333f285e
DG
1695}
1696
6c9cc2ab
DG
1697/*
1698 * Using the session list, filled a lttng_session array to send back to the
1699 * client for session listing.
1700 *
1701 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1702 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1703 */
1704static void list_lttng_sessions(struct lttng_session *sessions)
1705{
1706 int i = 0;
1707 struct ltt_session *session;
1708
1709 DBG("Getting all available session");
1710 /*
1711 * Iterate over session list and append data after the control struct in
1712 * the buffer.
1713 */
1714 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1715 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1716 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1717 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1718 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1719 i++;
1720 }
1721}
1722
9f19cc17
DG
1723/*
1724 * Fill lttng_channel array of all channels.
1725 */
1726static void list_lttng_channels(struct ltt_session *session,
1727 struct lttng_channel *channels)
1728{
1729 int i = 0;
1730 struct ltt_kernel_channel *kchan;
1731
1732 DBG("Listing channels for session %s", session->name);
1733
1734 /* Kernel channels */
1735 if (session->kernel_session != NULL) {
54d01ffb
DG
1736 cds_list_for_each_entry(kchan,
1737 &session->kernel_session->channel_list.head, list) {
9f19cc17
DG
1738 /* Copy lttng_channel struct to array */
1739 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1740 channels[i].enabled = kchan->enabled;
1741 i++;
1742 }
1743 }
1744
1745 /* TODO: Missing UST listing */
1746}
1747
1748/*
1749 * Fill lttng_event array of all events in the channel.
1750 */
1751static void list_lttng_events(struct ltt_kernel_channel *kchan,
1752 struct lttng_event *events)
1753{
1754 /*
1755 * TODO: This is ONLY kernel. Need UST support.
1756 */
1757 int i = 0;
1758 struct ltt_kernel_event *event;
1759
1760 DBG("Listing events for channel %s", kchan->channel->name);
1761
1762 /* Kernel channels */
1763 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1764 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1765 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG
1766 events[i].enabled = event->enabled;
1767 switch (event->event->instrumentation) {
1768 case LTTNG_KERNEL_TRACEPOINT:
1769 events[i].type = LTTNG_EVENT_TRACEPOINT;
1770 break;
1771 case LTTNG_KERNEL_KPROBE:
1772 case LTTNG_KERNEL_KRETPROBE:
1773 events[i].type = LTTNG_EVENT_PROBE;
1774 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1775 sizeof(struct lttng_kernel_kprobe));
1776 break;
1777 case LTTNG_KERNEL_FUNCTION:
1778 events[i].type = LTTNG_EVENT_FUNCTION;
1779 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1780 sizeof(struct lttng_kernel_function));
1781 break;
0133c199
MD
1782 case LTTNG_KERNEL_NOOP:
1783 events[i].type = LTTNG_EVENT_NOOP;
1784 break;
a54bd42d
MD
1785 case LTTNG_KERNEL_SYSCALL:
1786 events[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1787 break;
7a3d1328
MD
1788 case LTTNG_KERNEL_ALL:
1789 assert(0);
1790 break;
9f19cc17
DG
1791 }
1792 i++;
1793 }
1794}
1795
fac6795d 1796/*
54d01ffb 1797 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1798 */
54d01ffb
DG
1799static int cmd_disable_channel(struct ltt_session *session,
1800 int domain, char *channel_name)
fac6795d 1801{
54d01ffb 1802 int ret;
379473d2 1803
54d01ffb
DG
1804 switch (domain) {
1805 case LTTNG_DOMAIN_KERNEL:
1806 ret = channel_kernel_disable(session->kernel_session,
1807 channel_name);
1808 if (ret != LTTCOMM_OK) {
333f285e
DG
1809 goto error;
1810 }
54d01ffb
DG
1811
1812 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 1813 break;
44d3bd01
DG
1814 case LTTNG_DOMAIN_UST_PID:
1815 break;
d0254c7c 1816 default:
44d3bd01 1817 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 1818 goto error;
20fe2104
DG
1819 }
1820
54d01ffb 1821 ret = LTTCOMM_OK;
d65106b1 1822
54d01ffb
DG
1823error:
1824 return ret;
1825}
1826
56fff090
DG
1827/*
1828 * Copy channel from attributes and set it in the application channel list.
1829 */
1830static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
1831 struct lttng_channel *attr, struct ust_app *app)
1832{
1833 int ret;
1834 struct ltt_ust_channel *uchan, *new_chan;
1835
1836 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1837 if (uchan == NULL) {
1838 ret = LTTCOMM_FATAL;
1839 goto error;
1840 }
1841
1842 new_chan = trace_ust_create_channel(attr, usess->path);
1843 if (new_chan == NULL) {
1844 PERROR("malloc ltt_ust_channel");
1845 ret = LTTCOMM_FATAL;
1846 goto error;
1847 }
1848
1849 ret = channel_ust_copy(new_chan, uchan);
1850 if (ret < 0) {
1851 ret = LTTCOMM_FATAL;
1852 goto error;
1853 }
1854
1855 /* Add channel to the ust app channel list */
1856 cds_list_add(&new_chan->list, &app->channels.head);
1857 app->channels.count++;
1858
1859error:
1860 return ret;
1861}
1862
54d01ffb
DG
1863/*
1864 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1865 */
44d3bd01
DG
1866static int cmd_enable_channel(struct ltt_session *session,
1867 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG
1868{
1869 int ret;
d65106b1 1870
44d3bd01
DG
1871 switch (domain->type) {
1872 case LTTNG_DOMAIN_KERNEL:
1873 {
1874 struct ltt_kernel_channel *kchan;
54d01ffb 1875
44d3bd01
DG
1876 kchan = trace_kernel_get_channel_by_name(attr->name,
1877 session->kernel_session);
1878 if (kchan == NULL) {
1879 ret = channel_kernel_create(session->kernel_session,
1880 attr, kernel_poll_pipe[1]);
1881 } else {
1882 ret = channel_kernel_enable(session->kernel_session, kchan);
1883 }
1884
1885 if (ret != LTTCOMM_OK) {
1886 goto error;
1887 }
1888
1889 kernel_wait_quiescent(kernel_tracer_fd);
1890 break;
1891 }
1892 case LTTNG_DOMAIN_UST_PID:
1893 {
56fff090
DG
1894 int sock;
1895 struct ltt_ust_channel *uchan;
44d3bd01 1896 struct ltt_ust_session *usess;
56fff090 1897 struct ust_app *app;
44d3bd01
DG
1898
1899 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
1900 domain->attr.pid);
1901 if (usess == NULL) {
1902 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
1903 goto error;
1904 }
1905
56fff090 1906 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
1907 if (app == NULL) {
1908 ret = LTTCOMM_APP_NOT_FOUND;
1909 goto error;
1910 }
56fff090 1911 sock = app->sock;
44d3bd01
DG
1912
1913 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1914 if (uchan == NULL) {
56fff090 1915 ret = channel_ust_create(usess, attr, sock);
44d3bd01 1916 } else {
56fff090 1917 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG
1918 }
1919
1920 if (ret != LTTCOMM_OK) {
1921 goto error;
1922 }
1923
56fff090
DG
1924 ret = copy_ust_channel_to_app(usess, attr, app);
1925 if (ret != LTTCOMM_OK) {
44d3bd01
DG
1926 goto error;
1927 }
1928
44d3bd01
DG
1929 DBG("UST channel %s created for app sock %d with pid %d",
1930 attr->name, app->sock, domain->attr.pid);
1931 break;
1932 }
1933 default:
1934 ret = LTTCOMM_UNKNOWN_DOMAIN;
1935 goto error;
54d01ffb
DG
1936 }
1937
1938 ret = LTTCOMM_OK;
1939
1940error:
1941 return ret;
1942}
1943
1944/*
1945 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1946 */
1947static int cmd_disable_event(struct ltt_session *session, int domain,
1948 char *channel_name, char *event_name)
1949{
1950 int ret;
1951 struct ltt_kernel_channel *kchan;
1952
1953 switch (domain) {
1954 case LTTNG_DOMAIN_KERNEL:
1955 kchan = trace_kernel_get_channel_by_name(channel_name,
1956 session->kernel_session);
1957 if (kchan == NULL) {
1958 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1959 goto error;
d65106b1
DG
1960 }
1961
7a3d1328 1962 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG
1963 if (ret != LTTCOMM_OK) {
1964 goto error;
1965 }
1966
1967 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 1968 break;
54d01ffb
DG
1969 default:
1970 /* TODO: Userspace tracing */
1971 ret = LTTCOMM_NOT_IMPLEMENTED;
1972 goto error;
d65106b1 1973 }
26cc6b4e 1974
54d01ffb
DG
1975 ret = LTTCOMM_OK;
1976
1977error:
1978 return ret;
1979}
1980
1981/*
1982 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1983 */
1984static int cmd_disable_event_all(struct ltt_session *session, int domain,
1985 char *channel_name)
1986{
1987 int ret;
1988 struct ltt_kernel_channel *kchan;
1989
1990 switch (domain) {
1991 case LTTNG_DOMAIN_KERNEL:
1992 kchan = trace_kernel_get_channel_by_name(channel_name,
1993 session->kernel_session);
1994 if (kchan == NULL) {
1995 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1996 goto error;
26cc6b4e
DG
1997 }
1998
54d01ffb
DG
1999 ret = event_kernel_disable_all(session->kernel_session, kchan);
2000 if (ret != LTTCOMM_OK) {
0b97ec54 2001 goto error;
26cc6b4e
DG
2002 }
2003
54d01ffb 2004 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2005 break;
54d01ffb
DG
2006 default:
2007 /* TODO: Userspace tracing */
2008 ret = LTTCOMM_NOT_IMPLEMENTED;
2009 goto error;
26cc6b4e 2010 }
e953ef25 2011
54d01ffb 2012 ret = LTTCOMM_OK;
e953ef25 2013
54d01ffb
DG
2014error:
2015 return ret;
2016}
f5177a38 2017
54d01ffb
DG
2018/*
2019 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2020 */
2021static int cmd_add_context(struct ltt_session *session, int domain,
2022 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2023{
2024 int ret;
f5177a38 2025
54d01ffb
DG
2026 switch (domain) {
2027 case LTTNG_DOMAIN_KERNEL:
2028 /* Add kernel context to kernel tracer */
2029 ret = context_kernel_add(session->kernel_session, ctx,
2030 event_name, channel_name);
2031 if (ret != LTTCOMM_OK) {
f5177a38 2032 goto error;
e953ef25
DG
2033 }
2034
e953ef25 2035 break;
54d01ffb
DG
2036 default:
2037 /* TODO: Userspace tracing */
2038 ret = LTTCOMM_NOT_IMPLEMENTED;
2039 goto error;
e953ef25 2040 }
950131af 2041
54d01ffb 2042 ret = LTTCOMM_OK;
950131af 2043
54d01ffb
DG
2044error:
2045 return ret;
2046}
2047
2048/*
2049 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2050 */
2051static int cmd_enable_event(struct ltt_session *session, int domain,
2052 char *channel_name, struct lttng_event *event)
2053{
2054 int ret;
2055 struct ltt_kernel_channel *kchan;
f6cd6b0f 2056 struct lttng_channel *attr;
54d01ffb
DG
2057
2058 switch (domain) {
2059 case LTTNG_DOMAIN_KERNEL:
2060 kchan = trace_kernel_get_channel_by_name(channel_name,
2061 session->kernel_session);
2062 if (kchan == NULL) {
f6cd6b0f
DG
2063 attr = channel_new_default_attr(domain);
2064 if (attr == NULL) {
2065 ret = LTTCOMM_FATAL;
2066 goto error;
2067 }
2068 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2069
54d01ffb 2070 /* This call will notify the kernel thread */
44d3bd01 2071 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2072 attr, kernel_poll_pipe[1]);
54d01ffb 2073 if (ret != LTTCOMM_OK) {
f5177a38
DG
2074 goto error;
2075 }
54d01ffb 2076 }
950131af 2077
54d01ffb
DG
2078 /* Get the newly created kernel channel pointer */
2079 kchan = trace_kernel_get_channel_by_name(channel_name,
2080 session->kernel_session);
2081 if (kchan == NULL) {
2082 /* This sould not happen... */
2083 ret = LTTCOMM_FATAL;
2084 goto error;
2085 }
f5177a38 2086
7a3d1328 2087 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, event);
54d01ffb 2088 if (ret != LTTCOMM_OK) {
f5177a38 2089 goto error;
950131af
DG
2090 }
2091
54d01ffb 2092 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2093 break;
54d01ffb
DG
2094 default:
2095 /* TODO: Userspace tracing */
2096 ret = LTTCOMM_NOT_IMPLEMENTED;
2097 goto error;
950131af 2098 }
d36b8583 2099
54d01ffb 2100 ret = LTTCOMM_OK;
d36b8583 2101
54d01ffb
DG
2102error:
2103 return ret;
2104}
7d29a247 2105
54d01ffb
DG
2106/*
2107 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2108 */
2109static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2110 char *channel_name, int event_type)
54d01ffb
DG
2111{
2112 int ret;
2113 struct ltt_kernel_channel *kchan;
7d29a247 2114
54d01ffb
DG
2115 switch (domain) {
2116 case LTTNG_DOMAIN_KERNEL:
2117 kchan = trace_kernel_get_channel_by_name(channel_name,
2118 session->kernel_session);
2119 if (kchan == NULL) {
2120 /* This call will notify the kernel thread */
44d3bd01
DG
2121 ret = channel_kernel_create(session->kernel_session, NULL,
2122 kernel_poll_pipe[1]);
54d01ffb
DG
2123 if (ret != LTTCOMM_OK) {
2124 goto error;
d36b8583 2125 }
54d01ffb 2126 }
0d0c377a 2127
54d01ffb
DG
2128 /* Get the newly created kernel channel pointer */
2129 kchan = trace_kernel_get_channel_by_name(channel_name,
2130 session->kernel_session);
2131 if (kchan == NULL) {
2132 /* This sould not happen... */
2133 ret = LTTCOMM_FATAL;
2134 goto error;
2135 }
0fdd1e2c 2136
7a3d1328
MD
2137 switch (event_type) {
2138 case LTTNG_KERNEL_SYSCALL:
2139 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2140 kchan, kernel_tracer_fd);
7a3d1328
MD
2141 break;
2142 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2143 /*
7a3d1328
MD
2144 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2145 * events already registered to the channel.
8c9ae521 2146 */
7a3d1328
MD
2147 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2148 kchan, kernel_tracer_fd);
2149 break;
2150 case LTTNG_KERNEL_ALL:
2151 /* Enable syscalls and tracepoints */
8c9ae521
DG
2152 ret = event_kernel_enable_all(session->kernel_session,
2153 kchan, kernel_tracer_fd);
7a3d1328
MD
2154 break;
2155 default:
2156 ret = LTTCOMM_KERN_ENABLE_FAIL;
2157 goto error;
8c9ae521 2158 }
54d01ffb 2159 if (ret != LTTCOMM_OK) {
0d0c377a 2160 goto error;
d36b8583
DG
2161 }
2162
54d01ffb 2163 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2164 break;
54d01ffb
DG
2165 default:
2166 /* TODO: Userspace tracing */
2167 ret = LTTCOMM_NOT_IMPLEMENTED;
2168 goto error;
d36b8583 2169 }
f3ed775e 2170
54d01ffb
DG
2171 ret = LTTCOMM_OK;
2172
2173error:
2174 return ret;
2175}
2176
2177/*
2178 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2179 */
2180static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2181{
2182 int ret;
2183 ssize_t nb_events = 0;
2184
2185 switch (domain) {
2186 case LTTNG_DOMAIN_KERNEL:
2187 nb_events = kernel_list_events(kernel_tracer_fd, events);
2188 if (nb_events < 0) {
2189 ret = LTTCOMM_KERN_LIST_FAIL;
2190 goto error;
894be886 2191 }
54d01ffb
DG
2192 break;
2193 default:
2194 /* TODO: Userspace listing */
2195 ret = LTTCOMM_NOT_IMPLEMENTED;
2196 goto error;
2197 }
894be886 2198
54d01ffb 2199 return nb_events;
7d29a247 2200
54d01ffb
DG
2201error:
2202 /* Return negative value to differentiate return code */
2203 return -ret;
2204}
b389abbe 2205
54d01ffb
DG
2206/*
2207 * Command LTTNG_START_TRACE processed by the client thread.
2208 */
2209static int cmd_start_trace(struct ltt_session *session)
2210{
2211 int ret;
2212 struct ltt_kernel_channel *kchan;
2213 struct ltt_kernel_session *ksession;
b389abbe 2214
54d01ffb
DG
2215 /* Short cut */
2216 ksession = session->kernel_session;
5eb91c98 2217
54d01ffb
DG
2218 /* Kernel tracing */
2219 if (ksession != NULL) {
2220 /* Open kernel metadata */
2221 if (ksession->metadata == NULL) {
2222 ret = kernel_open_metadata(ksession, ksession->trace_path);
2223 if (ret < 0) {
2224 ret = LTTCOMM_KERN_META_FAIL;
2225 goto error;
b389abbe 2226 }
54d01ffb 2227 }
7d29a247 2228
54d01ffb
DG
2229 /* Open kernel metadata stream */
2230 if (ksession->metadata_stream_fd == 0) {
2231 ret = kernel_open_metadata_stream(ksession);
2232 if (ret < 0) {
2233 ERR("Kernel create metadata stream failed");
2234 ret = LTTCOMM_KERN_STREAM_FAIL;
2235 goto error;
2236 }
2237 }
2238
2239 /* For each channel */
2240 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2241 if (kchan->stream_count == 0) {
2242 ret = kernel_open_channel_stream(kchan);
2243 if (ret < 0) {
2244 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2245 goto error;
2246 }
54d01ffb
DG
2247 /* Update the stream global counter */
2248 ksession->stream_count_global += ret;
7d29a247 2249 }
54d01ffb
DG
2250 }
2251
2252 /* Setup kernel consumer socket and send fds to it */
2253 ret = init_kernel_tracing(ksession);
2254 if (ret < 0) {
2255 ret = LTTCOMM_KERN_START_FAIL;
2256 goto error;
2257 }
2258
2259 /* This start the kernel tracing */
2260 ret = kernel_start_session(ksession);
2261 if (ret < 0) {
2262 ret = LTTCOMM_KERN_START_FAIL;
2263 goto error;
2264 }
2265
2266 /* Quiescent wait after starting trace */
2267 kernel_wait_quiescent(kernel_tracer_fd);
2268 }
2269
2270 /* TODO: Start all UST traces */
2271
2272 ret = LTTCOMM_OK;
2273
2274error:
2275 return ret;
2276}
2277
2278/*
2279 * Command LTTNG_STOP_TRACE processed by the client thread.
2280 */
2281static int cmd_stop_trace(struct ltt_session *session)
2282{
2283 int ret;
2284 struct ltt_kernel_channel *kchan;
2285 struct ltt_kernel_session *ksession;
2286
2287 /* Short cut */
2288 ksession = session->kernel_session;
2289
2290 /* Kernel tracer */
2291 if (ksession != NULL) {
2292 DBG("Stop kernel tracing");
2293
2294 /* Flush all buffers before stopping */
2295 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2296 if (ret < 0) {
2297 ERR("Kernel metadata flush failed");
2298 }
f34daff7 2299
54d01ffb
DG
2300 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2301 ret = kernel_flush_buffer(kchan);
0d0c377a 2302 if (ret < 0) {
54d01ffb 2303 ERR("Kernel flush buffer error");
7d29a247 2304 }
54d01ffb 2305 }
19e70852 2306
54d01ffb
DG
2307 ret = kernel_stop_session(ksession);
2308 if (ret < 0) {
2309 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2310 goto error;
f3ed775e 2311 }
54d01ffb
DG
2312
2313 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2314 }
54d01ffb
DG
2315
2316 /* TODO : User-space tracer */
2317
2318 ret = LTTCOMM_OK;
2319
2320error:
2321 return ret;
2322}
2323
2324/*
2325 * Command LTTNG_CREATE_SESSION processed by the client thread.
2326 */
2327static int cmd_create_session(char *name, char *path)
2328{
2329 int ret;
2330
2331 ret = session_create(name, path);
2332 if (ret != LTTCOMM_OK) {
2333 goto error;
2334 }
2335
2336 ret = LTTCOMM_OK;
2337
2338error:
2339 return ret;
2340}
2341
2342/*
2343 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2344 */
2345static int cmd_destroy_session(struct ltt_session *session, char *name)
2346{
2347 int ret;
2348
2349 /* Clean kernel session teardown */
2350 teardown_kernel_session(session);
2351
2352 /*
2353 * Must notify the kernel thread here to update it's poll setin order
2354 * to remove the channel(s)' fd just destroyed.
2355 */
2356 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2357 if (ret < 0) {
2358 perror("write kernel poll pipe");
2359 }
2360
271933a4 2361 ret = session_destroy(session);
54d01ffb
DG
2362
2363 return ret;
2364}
2365
2366/*
2367 * Command LTTNG_CALIBRATE processed by the client thread.
2368 */
2369static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2370{
2371 int ret;
2372
2373 switch (domain) {
2374 case LTTNG_DOMAIN_KERNEL:
33a2b854 2375 {
54d01ffb 2376 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2377
54d01ffb
DG
2378 kcalibrate.type = calibrate->type;
2379 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2380 if (ret < 0) {
54d01ffb
DG
2381 ret = LTTCOMM_KERN_ENABLE_FAIL;
2382 goto error;
33a2b854 2383 }
54d01ffb
DG
2384 break;
2385 }
2386 default:
2387 /* TODO: Userspace tracing */
2388 ret = LTTCOMM_NOT_IMPLEMENTED;
2389 goto error;
2390 }
33a2b854 2391
54d01ffb 2392 ret = LTTCOMM_OK;
33a2b854 2393
54d01ffb
DG
2394error:
2395 return ret;
2396}
7d29a247 2397
54d01ffb
DG
2398/*
2399 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2400 */
2401static int cmd_register_consumer(struct ltt_session *session, int domain,
2402 char *sock_path)
2403{
2404 int ret, sock;
b389abbe 2405
54d01ffb
DG
2406 switch (domain) {
2407 case LTTNG_DOMAIN_KERNEL:
2408 /* Can't register a consumer if there is already one */
2409 if (session->kernel_session->consumer_fd != 0) {
2410 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2411 goto error;
2412 }
2413
2414 sock = lttcomm_connect_unix_sock(sock_path);
2415 if (sock < 0) {
2416 ret = LTTCOMM_CONNECT_FAIL;
2417 goto error;
2418 }
2419
2420 session->kernel_session->consumer_fd = sock;
2421 break;
2422 default:
2423 /* TODO: Userspace tracing */
2424 ret = LTTCOMM_NOT_IMPLEMENTED;
2425 goto error;
2426 }
2427
2428 ret = LTTCOMM_OK;
2429
2430error:
2431 return ret;
2432}
2433
2434/*
2435 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2436 */
2437static ssize_t cmd_list_domains(struct ltt_session *session,
2438 struct lttng_domain **domains)
2439{
2440 int ret;
2441 ssize_t nb_dom = 0;
2442
2443 if (session->kernel_session != NULL) {
2444 nb_dom++;
2445 }
2446
2447 nb_dom += session->ust_session_list.count;
2448
2449 *domains = malloc(nb_dom * sizeof(struct lttng_domain));
2450 if (*domains == NULL) {
2451 ret = -LTTCOMM_FATAL;
2452 goto error;
2453 }
2454
2455 (*domains)[0].type = LTTNG_DOMAIN_KERNEL;
2456
2457 /* TODO: User-space tracer domain support */
2458
2459 return nb_dom;
2460
2461error:
2462 return ret;
2463}
2464
2465/*
2466 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2467 */
2468static ssize_t cmd_list_channels(struct ltt_session *session,
2469 struct lttng_channel **channels)
2470{
2471 int ret;
2472 ssize_t nb_chan = 0;
2473
2474 if (session->kernel_session != NULL) {
2475 nb_chan += session->kernel_session->channel_count;
2476 }
2477
2478 *channels = malloc(nb_chan * sizeof(struct lttng_channel));
2479 if (*channels == NULL) {
2480 ret = -LTTCOMM_FATAL;
2481 goto error;
2482 }
2483
2484 list_lttng_channels(session, *channels);
2485
2486 return nb_chan;
2487
2488error:
2489 return ret;
2490}
2491
2492/*
2493 * Command LTTNG_LIST_EVENTS processed by the client thread.
2494 */
2495static ssize_t cmd_list_events(struct ltt_session *session,
2496 char *channel_name, struct lttng_event **events)
2497{
2498 int ret;
2499 ssize_t nb_event = 0;
2500 struct ltt_kernel_channel *kchan = NULL;
2501
2502 if (session->kernel_session != NULL) {
2503 kchan = trace_kernel_get_channel_by_name(channel_name,
2504 session->kernel_session);
2505 if (kchan == NULL) {
2506 ret = -LTTCOMM_KERN_CHAN_NOT_FOUND;
2507 goto error;
2508 }
2509 nb_event += kchan->event_count;
2510 }
2511
2512 *events = malloc(nb_event * sizeof(struct lttng_event));
2513 if (*events == NULL) {
2514 ret = -LTTCOMM_FATAL;
2515 goto error;
2516 }
2517
2518 list_lttng_events(kchan, *events);
2519
2520 /* TODO: User-space tracer support */
2521
2522 return nb_event;
2523
2524error:
2525 return ret;
2526}
2527
2528/*
2529 * Process the command requested by the lttng client within the command
2530 * context structure. This function make sure that the return structure (llm)
2531 * is set and ready for transmission before returning.
2532 *
2533 * Return any error encountered or 0 for success.
2534 */
2535static int process_client_msg(struct command_ctx *cmd_ctx)
2536{
2537 int ret = LTTCOMM_OK;
44d3bd01 2538 int need_tracing_session = 1;
54d01ffb
DG
2539
2540 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2541
2542 /*
2543 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2544 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2545 * command.
2546 */
2547 switch(cmd_ctx->lsm->cmd_type) {
2548 case LTTNG_LIST_SESSIONS:
2549 case LTTNG_LIST_TRACEPOINTS:
2550 case LTTNG_LIST_DOMAINS:
2551 case LTTNG_LIST_CHANNELS:
2552 case LTTNG_LIST_EVENTS:
2553 break;
2554 default:
2555 /* Setup lttng message with no payload */
2556 ret = setup_lttng_msg(cmd_ctx, 0);
2557 if (ret < 0) {
2558 /* This label does not try to unlock the session */
2559 goto init_setup_error;
2560 }
2561 }
2562
2563 /* Commands that DO NOT need a session. */
2564 switch (cmd_ctx->lsm->cmd_type) {
2565 case LTTNG_CALIBRATE:
2566 case LTTNG_CREATE_SESSION:
2567 case LTTNG_LIST_SESSIONS:
2568 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2569 need_tracing_session = 0;
54d01ffb
DG
2570 break;
2571 default:
2572 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 2573 session_lock_list();
54d01ffb 2574 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 2575 session_unlock_list();
54d01ffb
DG
2576 if (cmd_ctx->session == NULL) {
2577 if (cmd_ctx->lsm->session.name != NULL) {
2578 ret = LTTCOMM_SESS_NOT_FOUND;
2579 } else {
2580 /* If no session name specified */
2581 ret = LTTCOMM_SELECT_SESS;
2582 }
2583 goto error;
2584 } else {
2585 /* Acquire lock for the session */
2586 session_lock(cmd_ctx->session);
2587 }
2588 break;
2589 }
b389abbe 2590
54d01ffb
DG
2591 /*
2592 * Check domain type for specific "pre-action".
2593 */
2594 switch (cmd_ctx->lsm->domain.type) {
2595 case LTTNG_DOMAIN_KERNEL:
2596 /* Kernel tracer check */
2597 if (kernel_tracer_fd == 0) {
2598 /* Basically, load kernel tracer modules */
2599 init_kernel_tracer();
2600 if (kernel_tracer_fd == 0) {
2601 ret = LTTCOMM_KERN_NA;
2602 goto error;
2603 }
2604 }
5eb91c98 2605
54d01ffb 2606 /* Need a session for kernel command */
44d3bd01 2607 if (need_tracing_session) {
54d01ffb
DG
2608 if (cmd_ctx->session->kernel_session == NULL) {
2609 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2610 if (ret < 0) {
54d01ffb 2611 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2612 goto error;
2613 }
b389abbe 2614 }
7d29a247 2615
54d01ffb 2616 /* Start the kernel consumer daemon */
4c93ba8b 2617 pthread_mutex_lock(&kconsumerd_pid_mutex);
54d01ffb
DG
2618 if (kconsumerd_pid == 0 &&
2619 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
4c93ba8b 2620 pthread_mutex_unlock(&kconsumerd_pid_mutex);
54d01ffb 2621 ret = start_kconsumerd();
7d29a247 2622 if (ret < 0) {
54d01ffb
DG
2623 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2624 goto error;
950131af 2625 }
33a2b854 2626 }
4c93ba8b 2627 pthread_mutex_unlock(&kconsumerd_pid_mutex);
0d0c377a 2628 }
54d01ffb 2629 break;
44d3bd01
DG
2630 case LTTNG_DOMAIN_UST_PID:
2631 {
2632 struct ltt_ust_session *usess;
2633
2634 if (need_tracing_session) {
2635 usess = trace_ust_get_session_by_pid(
2636 &cmd_ctx->session->ust_session_list,
2637 cmd_ctx->lsm->domain.attr.pid);
2638 if (usess == NULL) {
2639 ret = create_ust_session(cmd_ctx->session,
2640 &cmd_ctx->lsm->domain);
2641 if (ret != LTTCOMM_OK) {
2642 goto error;
2643 }
2644 }
2645 }
2646 break;
2647 }
54d01ffb
DG
2648 default:
2649 /* TODO Userspace tracer */
2650 break;
2651 }
33a2b854 2652
54d01ffb
DG
2653 /* Process by command type */
2654 switch (cmd_ctx->lsm->cmd_type) {
2655 case LTTNG_ADD_CONTEXT:
2656 {
2657 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2658 cmd_ctx->lsm->u.context.channel_name,
2659 cmd_ctx->lsm->u.context.event_name,
2660 &cmd_ctx->lsm->u.context.ctx);
2661 break;
2662 }
2663 case LTTNG_DISABLE_CHANNEL:
2664 {
2665 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2666 cmd_ctx->lsm->u.disable.channel_name);
2667 break;
2668 }
2669 case LTTNG_DISABLE_EVENT:
2670 {
2671 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2672 cmd_ctx->lsm->u.disable.channel_name,
2673 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2674 ret = LTTCOMM_OK;
2675 break;
2676 }
54d01ffb
DG
2677 case LTTNG_DISABLE_ALL_EVENT:
2678 {
2679 DBG("Disabling all kernel event");
2680
2681 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2682 cmd_ctx->lsm->u.disable.channel_name);
2683 break;
2684 }
2685 case LTTNG_ENABLE_CHANNEL:
2686 {
44d3bd01 2687 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG
2688 &cmd_ctx->lsm->u.channel.chan);
2689 break;
2690 }
2691 case LTTNG_ENABLE_EVENT:
2692 {
2693 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2694 cmd_ctx->lsm->u.enable.channel_name,
2695 &cmd_ctx->lsm->u.enable.event);
2696 break;
2697 }
2698 case LTTNG_ENABLE_ALL_EVENT:
2699 {
2700 DBG("Enabling all kernel event");
2701
2702 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
2703 cmd_ctx->lsm->u.enable.channel_name,
2704 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
2705 break;
2706 }
052da939 2707 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2708 {
9f19cc17 2709 struct lttng_event *events;
54d01ffb 2710 ssize_t nb_events;
052da939 2711
54d01ffb
DG
2712 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2713 if (nb_events < 0) {
2714 ret = -nb_events;
2715 goto error;
2ef84c95
DG
2716 }
2717
2718 /*
2719 * Setup lttng message with payload size set to the event list size in
2720 * bytes and then copy list into the llm payload.
2721 */
052da939 2722 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2723 if (ret < 0) {
052da939 2724 free(events);
2ef84c95
DG
2725 goto setup_error;
2726 }
2727
2728 /* Copy event list into message payload */
9f19cc17 2729 memcpy(cmd_ctx->llm->payload, events,
052da939 2730 sizeof(struct lttng_event) * nb_events);
2ef84c95 2731
9f19cc17 2732 free(events);
2ef84c95
DG
2733
2734 ret = LTTCOMM_OK;
2735 break;
2736 }
f3ed775e 2737 case LTTNG_START_TRACE:
8c0faa1d 2738 {
54d01ffb 2739 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2740 break;
2741 }
f3ed775e 2742 case LTTNG_STOP_TRACE:
8c0faa1d 2743 {
54d01ffb 2744 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2745 break;
2746 }
5e16da05
MD
2747 case LTTNG_CREATE_SESSION:
2748 {
54d01ffb
DG
2749 ret = cmd_create_session(cmd_ctx->lsm->session.name,
2750 cmd_ctx->lsm->session.path);
5e16da05
MD
2751 break;
2752 }
2753 case LTTNG_DESTROY_SESSION:
2754 {
54d01ffb
DG
2755 ret = cmd_destroy_session(cmd_ctx->session,
2756 cmd_ctx->lsm->session.name);
5461b305 2757 break;
5e16da05 2758 }
9f19cc17 2759 case LTTNG_LIST_DOMAINS:
5e16da05 2760 {
54d01ffb
DG
2761 ssize_t nb_dom;
2762 struct lttng_domain *domains;
5461b305 2763
54d01ffb
DG
2764 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2765 if (nb_dom < 0) {
2766 ret = -nb_dom;
2767 goto error;
ce3d728c 2768 }
520ff687 2769
54d01ffb 2770 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
2771 if (ret < 0) {
2772 goto setup_error;
520ff687 2773 }
57167058 2774
54d01ffb
DG
2775 /* Copy event list into message payload */
2776 memcpy(cmd_ctx->llm->payload, domains,
2777 nb_dom * sizeof(struct lttng_domain));
2778
2779 free(domains);
5e16da05 2780
5461b305 2781 ret = LTTCOMM_OK;
5e16da05
MD
2782 break;
2783 }
9f19cc17 2784 case LTTNG_LIST_CHANNELS:
5e16da05 2785 {
54d01ffb
DG
2786 size_t nb_chan;
2787 struct lttng_channel *channels;
2788
2789 nb_chan = cmd_list_channels(cmd_ctx->session, &channels);
2790 if (nb_chan < 0) {
2791 ret = -nb_chan;
2792 goto error;
5461b305 2793 }
ca95a216 2794
54d01ffb 2795 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
2796 if (ret < 0) {
2797 goto setup_error;
2798 }
9f19cc17 2799
54d01ffb
DG
2800 /* Copy event list into message payload */
2801 memcpy(cmd_ctx->llm->payload, channels,
2802 nb_chan * sizeof(struct lttng_channel));
2803
2804 free(channels);
9f19cc17
DG
2805
2806 ret = LTTCOMM_OK;
5461b305 2807 break;
5e16da05 2808 }
9f19cc17 2809 case LTTNG_LIST_EVENTS:
5e16da05 2810 {
54d01ffb 2811 size_t nb_event;
684d34d2 2812 struct lttng_event *events = NULL;
9f19cc17 2813
54d01ffb
DG
2814 nb_event = cmd_list_events(cmd_ctx->session,
2815 cmd_ctx->lsm->u.list.channel_name, &events);
2816 if (nb_event < 0) {
2817 ret = -nb_event;
2818 goto error;
5461b305 2819 }
ca95a216 2820
54d01ffb 2821 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
2822 if (ret < 0) {
2823 goto setup_error;
2824 }
9f19cc17 2825
54d01ffb
DG
2826 /* Copy event list into message payload */
2827 memcpy(cmd_ctx->llm->payload, events,
2828 nb_event * sizeof(struct lttng_event));
9f19cc17 2829
54d01ffb 2830 free(events);
9f19cc17
DG
2831
2832 ret = LTTCOMM_OK;
5461b305 2833 break;
5e16da05
MD
2834 }
2835 case LTTNG_LIST_SESSIONS:
2836 {
54d01ffb 2837 session_lock_list();
5461b305 2838
6c9cc2ab 2839 if (session_list_ptr->count == 0) {
f3ed775e 2840 ret = LTTCOMM_NO_SESSION;
54d01ffb 2841 session_unlock_list();
5461b305 2842 goto error;
57167058 2843 }
5e16da05 2844
6c9cc2ab
DG
2845 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
2846 session_list_ptr->count);
5461b305 2847 if (ret < 0) {
54d01ffb 2848 session_unlock_list();
5461b305 2849 goto setup_error;
e065084a 2850 }
5e16da05 2851
6c9cc2ab
DG
2852 /* Filled the session array */
2853 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
2854
54d01ffb 2855 session_unlock_list();
5e16da05 2856
5461b305 2857 ret = LTTCOMM_OK;
5e16da05
MD
2858 break;
2859 }
d0254c7c
MD
2860 case LTTNG_CALIBRATE:
2861 {
54d01ffb
DG
2862 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
2863 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
2864 break;
2865 }
d9800920
DG
2866 case LTTNG_REGISTER_CONSUMER:
2867 {
54d01ffb
DG
2868 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2869 cmd_ctx->lsm->u.reg.path);
d9800920
DG
2870 break;
2871 }
5e16da05 2872 default:
5e16da05 2873 ret = LTTCOMM_UND;
5461b305 2874 break;
fac6795d
DG
2875 }
2876
5461b305 2877error:
5461b305
DG
2878 if (cmd_ctx->llm == NULL) {
2879 DBG("Missing llm structure. Allocating one.");
894be886 2880 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
2881 goto setup_error;
2882 }
2883 }
54d01ffb 2884 /* Set return code */
5461b305 2885 cmd_ctx->llm->ret_code = ret;
5461b305 2886setup_error:
b5541356 2887 if (cmd_ctx->session) {
54d01ffb 2888 session_unlock(cmd_ctx->session);
b5541356 2889 }
54d01ffb 2890init_setup_error:
8028d920 2891 return ret;
fac6795d
DG
2892}
2893
1d4b027a 2894/*
d063d709
DG
2895 * This thread manage all clients request using the unix client socket for
2896 * communication.
1d4b027a
DG
2897 */
2898static void *thread_manage_clients(void *data)
2899{
5eb91c98
DG
2900 int sock = 0, ret, i, pollfd;
2901 uint32_t revents, nb_fd;
273ea72c 2902 struct command_ctx *cmd_ctx = NULL;
5eb91c98 2903 struct lttng_poll_event events;
1d4b027a
DG
2904
2905 DBG("[thread] Manage client started");
2906
2907 ret = lttcomm_listen_unix_sock(client_sock);
2908 if (ret < 0) {
2909 goto error;
2910 }
2911
5eb91c98
DG
2912 /*
2913 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2914 * more will be added to this poll set.
2915 */
2916 ret = create_thread_poll_set(&events, 2);
2917 if (ret < 0) {
2918 goto error;
2919 }
273ea72c 2920
5eb91c98
DG
2921 /* Add the application registration socket */
2922 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2923 if (ret < 0) {
2924 goto error;
2925 }
273ea72c 2926
bbd973c2
DG
2927 /*
2928 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
2929 */
2930 if (opt_sig_parent) {
2931 kill(ppid, SIGCHLD);
2932 }
2933
2934 while (1) {
1d4b027a 2935 DBG("Accepting client command ...");
273ea72c 2936
5eb91c98
DG
2937 nb_fd = LTTNG_POLL_GETNB(&events);
2938
273ea72c 2939 /* Inifinite blocking call, waiting for transmission */
5eb91c98 2940 ret = lttng_poll_wait(&events, -1);
273ea72c 2941 if (ret < 0) {
273ea72c
DG
2942 goto error;
2943 }
2944
5eb91c98
DG
2945 for (i = 0; i < nb_fd; i++) {
2946 /* Fetch once the poll data */
2947 revents = LTTNG_POLL_GETEV(&events, i);
2948 pollfd = LTTNG_POLL_GETFD(&events, i);
2949
2950 /* Thread quit pipe has been closed. Killing thread. */
2951 ret = check_thread_quit_pipe(pollfd, revents);
2952 if (ret) {
2953 goto error;
2954 }
2955
2956 /* Event on the registration socket */
2957 if (pollfd == client_sock) {
2958 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2959 ERR("Client socket poll error");
2960 goto error;
2961 }
2962 }
2963 }
2964
2965 DBG("Wait for client response");
2966
2967 sock = lttcomm_accept_unix_sock(client_sock);
2968 if (sock < 0) {
273ea72c 2969 goto error;
273ea72c
DG
2970 }
2971
5eb91c98
DG
2972 /* Allocate context command to process the client request */
2973 cmd_ctx = malloc(sizeof(struct command_ctx));
2974 if (cmd_ctx == NULL) {
2975 perror("malloc cmd_ctx");
1d4b027a 2976 goto error;
5eb91c98 2977 }
1d4b027a 2978
5eb91c98
DG
2979 /* Allocate data buffer for reception */
2980 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
2981 if (cmd_ctx->lsm == NULL) {
2982 perror("malloc cmd_ctx->lsm");
2983 goto error;
2984 }
1d4b027a 2985
5eb91c98
DG
2986 cmd_ctx->llm = NULL;
2987 cmd_ctx->session = NULL;
1d4b027a 2988
5eb91c98
DG
2989 /*
2990 * Data is received from the lttng client. The struct
2991 * lttcomm_session_msg (lsm) contains the command and data request of
2992 * the client.
2993 */
2994 DBG("Receiving data from client ...");
2995 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
2996 sizeof(struct lttcomm_session_msg));
2997 if (ret <= 0) {
2998 DBG("Nothing recv() from client... continuing");
2999 close(sock);
3000 free(cmd_ctx);
3001 continue;
3002 }
1d4b027a 3003
5eb91c98
DG
3004 // TODO: Validate cmd_ctx including sanity check for
3005 // security purpose.
f7776ea7 3006
5eb91c98
DG
3007 /*
3008 * This function dispatch the work to the kernel or userspace tracer
3009 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3010 * informations for the client. The command context struct contains
3011 * everything this function may needs.
3012 */
3013 ret = process_client_msg(cmd_ctx);
3014 if (ret < 0) {
bbd973c2 3015 /*
5eb91c98
DG
3016 * TODO: Inform client somehow of the fatal error. At
3017 * this point, ret < 0 means that a malloc failed
3018 * (ENOMEM). Error detected but still accept command.
bbd973c2 3019 */
bbd973c2 3020 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
3021 continue;
3022 }
d6e4fca4 3023
54d01ffb
DG
3024 DBG("Sending response (size: %d, retcode: %s)",
3025 cmd_ctx->lttng_msg_size,
532d79a7 3026 lttng_get_readable_code(-cmd_ctx->llm->ret_code));
54d01ffb 3027 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
3028 if (ret < 0) {
3029 ERR("Failed to send data back to client");
bbd973c2 3030 }
1d4b027a 3031
5eb91c98
DG
3032 clean_command_ctx(&cmd_ctx);
3033
3034 /* End of transmission */
273ea72c
DG
3035 close(sock);
3036 }
3037
5eb91c98
DG
3038error:
3039 DBG("Client thread dying");
273ea72c 3040 unlink(client_unix_sock_path);
5eb91c98
DG
3041 close(client_sock);
3042 close(sock);
273ea72c 3043
5eb91c98 3044 lttng_poll_clean(&events);
a2fb29a5 3045 clean_command_ctx(&cmd_ctx);
1d4b027a
DG
3046 return NULL;
3047}
3048
3049
fac6795d
DG
3050/*
3051 * usage function on stderr
3052 */
3053static void usage(void)
3054{
b716ce68 3055 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
3056 fprintf(stderr, " -h, --help Display this usage.\n");
3057 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3058 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3059 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3060 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3061 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3062 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3063 fprintf(stderr, " -V, --version Show version number.\n");
3064 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3065 fprintf(stderr, " -q, --quiet No output at all.\n");
3066 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
31f73cc9 3067 fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
fac6795d
DG
3068}
3069
3070/*
3071 * daemon argument parsing
3072 */
3073static int parse_args(int argc, char **argv)
3074{
3075 int c;
3076
3077 static struct option long_options[] = {
3078 { "client-sock", 1, 0, 'c' },
3079 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
3080 { "kconsumerd-cmd-sock", 1, 0, 0 },
3081 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 3082 { "daemonize", 0, 0, 'd' },
5b8719f5 3083 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
3084 { "help", 0, 0, 'h' },
3085 { "group", 1, 0, 'g' },
3086 { "version", 0, 0, 'V' },
75462a81 3087 { "quiet", 0, 0, 'q' },
3f9947db 3088 { "verbose", 0, 0, 'v' },
31f73cc9 3089 { "verbose-kconsumerd", 0, 0, 'Z' },
fac6795d
DG
3090 { NULL, 0, 0, 0 }
3091 };
3092
3093 while (1) {
3094 int option_index = 0;
54d01ffb
DG
3095 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z",
3096 long_options, &option_index);
fac6795d
DG
3097 if (c == -1) {
3098 break;
3099 }
3100
3101 switch (c) {
3102 case 0:
3103 fprintf(stderr, "option %s", long_options[option_index].name);
3104 if (optarg) {
3105 fprintf(stderr, " with arg %s\n", optarg);
3106 }
3107 break;
b716ce68 3108 case 'c':
fac6795d
DG
3109 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3110 break;
3111 case 'a':
3112 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3113 break;
3114 case 'd':
3115 opt_daemon = 1;
3116 break;
3117 case 'g':
3118 opt_tracing_group = strdup(optarg);
3119 break;
3120 case 'h':
3121 usage();
3122 exit(EXIT_FAILURE);
3123 case 'V':
3124 fprintf(stdout, "%s\n", VERSION);
3125 exit(EXIT_SUCCESS);
5b8719f5
DG
3126 case 'S':
3127 opt_sig_parent = 1;
3128 break;
d6f42150
DG
3129 case 'E':
3130 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
3131 break;
3132 case 'C':
3133 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3134 break;
75462a81
DG
3135 case 'q':
3136 opt_quiet = 1;
3137 break;
3f9947db 3138 case 'v':
53086306
DG
3139 /* Verbose level can increase using multiple -v */
3140 opt_verbose += 1;
3f9947db 3141 break;
31f73cc9
MD
3142 case 'Z':
3143 opt_verbose_kconsumerd += 1;
3144 break;
fac6795d
DG
3145 default:
3146 /* Unknown option or other error.
3147 * Error is printed by getopt, just return */
3148 return -1;
3149 }
3150 }
3151
3152 return 0;
3153}
3154
3155/*
d063d709 3156 * Creates the two needed socket by the daemon.
d6f42150
DG
3157 * apps_sock - The communication socket for all UST apps.
3158 * client_sock - The communication of the cli tool (lttng).
fac6795d 3159 */
cf3af59e 3160static int init_daemon_socket(void)
fac6795d
DG
3161{
3162 int ret = 0;
3163 mode_t old_umask;
3164
3165 old_umask = umask(0);
3166
3167 /* Create client tool unix socket */
d6f42150
DG
3168 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3169 if (client_sock < 0) {
3170 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
3171 ret = -1;
3172 goto end;
3173 }
3174
3175 /* File permission MUST be 660 */
3176 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3177 if (ret < 0) {
d6f42150 3178 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
3179 perror("chmod");
3180 goto end;
3181 }
3182
3183 /* Create the application unix socket */
d6f42150
DG
3184 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3185 if (apps_sock < 0) {
3186 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
3187 ret = -1;
3188 goto end;
3189 }
3190
d6f42150 3191 /* File permission MUST be 666 */
54d01ffb
DG
3192 ret = chmod(apps_unix_sock_path,
3193 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3194 if (ret < 0) {
d6f42150 3195 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
3196 perror("chmod");
3197 goto end;
3198 }
3199
3200end:
3201 umask(old_umask);
3202 return ret;
3203}
3204
3205/*
54d01ffb
DG
3206 * Check if the global socket is available, and if a daemon is answering at the
3207 * other side. If yes, error is returned.
fac6795d 3208 */
cf3af59e 3209static int check_existing_daemon(void)
fac6795d 3210{
7d8234d9 3211 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3212 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3213 return 0;
099e26bd 3214 }
54d01ffb 3215
7d8234d9 3216 /* Is there anybody out there ? */
099e26bd 3217 if (lttng_session_daemon_alive()) {
7d8234d9 3218 return -EEXIST;
099e26bd 3219 } else {
7d8234d9 3220 return 0;
099e26bd 3221 }
fac6795d
DG
3222}
3223
fac6795d 3224/*
d063d709 3225 * Set the tracing group gid onto the client socket.
5e16da05 3226 *
d063d709
DG
3227 * Race window between mkdir and chown is OK because we are going from more
3228 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3229 */
d6f42150 3230static int set_permissions(void)
fac6795d
DG
3231{
3232 int ret;
996b65c8 3233 gid_t gid;
fac6795d 3234
996b65c8
MD
3235 gid = allowed_group();
3236 if (gid < 0) {
a463f419
DG
3237 if (is_root) {
3238 WARN("No tracing group detected");
3239 ret = 0;
3240 } else {
3241 ERR("Missing tracing group. Aborting execution.");
3242 ret = -1;
3243 }
fac6795d
DG
3244 goto end;
3245 }
3246
d6f42150 3247 /* Set lttng run dir */
996b65c8 3248 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG
3249 if (ret < 0) {
3250 ERR("Unable to set group on " LTTNG_RUNDIR);
3251 perror("chown");
3252 }
3253
3254 /* lttng client socket path */
996b65c8 3255 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3256 if (ret < 0) {
d6f42150
DG
3257 ERR("Unable to set group on %s", client_unix_sock_path);
3258 perror("chown");
3259 }
3260
3261 /* kconsumerd error socket path */
996b65c8 3262 ret = chown(kconsumerd_err_unix_sock_path, 0, gid);
d6f42150
DG
3263 if (ret < 0) {
3264 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
3265 perror("chown");
3266 }
3267
d6f42150 3268 DBG("All permissions are set");
e07ae692 3269
fac6795d
DG
3270end:
3271 return ret;
3272}
3273
7a485870 3274/*
d063d709 3275 * Create the pipe used to wake up the kernel thread.
7a485870
DG
3276 */
3277static int create_kernel_poll_pipe(void)
3278{
3279 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3280}
3281
099e26bd
DG
3282/*
3283 * Create the application command pipe to wake thread_manage_apps.
3284 */
3285static int create_apps_cmd_pipe(void)
3286{
3287 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3288}
3289
d6f42150 3290/*
d063d709 3291 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG
3292 */
3293static int create_lttng_rundir(void)
3294{
3295 int ret;
3296
3297 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
3298 if (ret < 0) {
b1f11e69
DG
3299 if (errno != EEXIST) {
3300 ERR("Unable to create " LTTNG_RUNDIR);
3301 goto error;
3302 } else {
3303 ret = 0;
3304 }
d6f42150
DG
3305 }
3306
3307error:
3308 return ret;
3309}
3310
3311/*
d063d709
DG
3312 * Setup sockets and directory needed by the kconsumerd communication with the
3313 * session daemon.
d6f42150
DG
3314 */
3315static int set_kconsumerd_sockets(void)
3316{
3317 int ret;
3318
3319 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
54d01ffb
DG
3320 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX,
3321 KCONSUMERD_ERR_SOCK_PATH);
d6f42150
DG
3322 }
3323
3324 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
54d01ffb
DG
3325 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX,
3326 KCONSUMERD_CMD_SOCK_PATH);
d6f42150
DG
3327 }
3328
3329 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
3330 if (ret < 0) {
6beb2242
DG
3331 if (errno != EEXIST) {
3332 ERR("Failed to create " KCONSUMERD_PATH);
3333 goto error;
3334 }
3335 ret = 0;
d6f42150
DG
3336 }
3337
3338 /* Create the kconsumerd error unix socket */
54d01ffb
DG
3339 kconsumerd_err_sock =
3340 lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
d6f42150
DG
3341 if (kconsumerd_err_sock < 0) {
3342 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
3343 ret = -1;
3344 goto error;
3345 }
3346
3347 /* File permission MUST be 660 */
54d01ffb
DG
3348 ret = chmod(kconsumerd_err_unix_sock_path,
3349 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150
DG
3350 if (ret < 0) {
3351 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
3352 perror("chmod");
3353 goto error;
3354 }
3355
3356error:
3357 return ret;
3358}
3359
fac6795d 3360/*
d063d709 3361 * Signal handler for the daemon
cf3af59e 3362 *
54d01ffb
DG
3363 * Simply stop all worker threads, leaving main() return gracefully after
3364 * joining all threads and calling cleanup().
fac6795d
DG
3365 */
3366static void sighandler(int sig)
3367{
3368 switch (sig) {
cf3af59e
MD
3369 case SIGPIPE:
3370 DBG("SIGPIPE catched");
3371 return;
3372 case SIGINT:
3373 DBG("SIGINT catched");
3374 stop_threads();
3375 break;
3376 case SIGTERM:
3377 DBG("SIGTERM catched");
3378 stop_threads();
3379 break;
3380 default:
3381 break;
fac6795d 3382 }
fac6795d
DG
3383}
3384
3385/*
d063d709 3386 * Setup signal handler for :
1d4b027a 3387 * SIGINT, SIGTERM, SIGPIPE
fac6795d 3388 */
1d4b027a 3389static int set_signal_handler(void)
fac6795d 3390{
1d4b027a
DG
3391 int ret = 0;
3392 struct sigaction sa;
3393 sigset_t sigset;
fac6795d 3394
1d4b027a
DG
3395 if ((ret = sigemptyset(&sigset)) < 0) {
3396 perror("sigemptyset");
3397 return ret;
3398 }
d6f42150 3399
1d4b027a
DG
3400 sa.sa_handler = sighandler;
3401 sa.sa_mask = sigset;
3402 sa.sa_flags = 0;
3403 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
3404 perror("sigaction");
3405 return ret;
d6f42150
DG
3406 }
3407
1d4b027a
DG
3408 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
3409 perror("sigaction");
3410 return ret;
d6f42150 3411 }
aaf26714 3412
1d4b027a
DG
3413 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3414 perror("sigaction");
3415 return ret;
8c0faa1d
DG
3416 }
3417
1d4b027a
DG
3418 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3419
3420 return ret;
fac6795d
DG
3421}
3422
f3ed775e 3423/*
d063d709
DG
3424 * Set open files limit to unlimited. This daemon can open a large number of
3425 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
3426 */
3427static void set_ulimit(void)
3428{
3429 int ret;
3430 struct rlimit lim;
3431
a88df331 3432 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
3433 lim.rlim_cur = 65535;