Fix UST define in global headers
[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"
91d76f53 53#include "traceable-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
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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
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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
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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
DG
346 DBG("Closing all UST sockets");
347 clean_traceable_apps_list();
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) {
5eb91c98
DG
704 ret = update_kernel_poll(&events);
705 if (ret < 0) {
7a485870
DG
706 goto error;
707 }
708 update_poll_flag = 0;
709 }
710
5eb91c98
DG
711 nb_fd = LTTNG_POLL_GETNB(&events);
712
713 DBG("Thread kernel polling on %d fds", nb_fd);
714
715 /* Zeroed the poll events */
716 lttng_poll_reset(&events);
7a485870
DG
717
718 /* Poll infinite value of time */
5eb91c98 719 ret = lttng_poll_wait(&events, -1);
7a485870 720 if (ret < 0) {
7a485870
DG
721 goto error;
722 } else if (ret == 0) {
723 /* Should not happen since timeout is infinite */
85611738
DG
724 ERR("Return value of poll is 0 with an infinite timeout.\n"
725 "This should not have happened! Continuing...");
7a485870
DG
726 continue;
727 }
728
5eb91c98
DG
729 for (i = 0; i < nb_fd; i++) {
730 /* Fetch once the poll data */
731 revents = LTTNG_POLL_GETEV(&events, i);
732 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 733
5eb91c98
DG
734 /* Thread quit pipe has been closed. Killing thread. */
735 ret = check_thread_quit_pipe(pollfd, revents);
736 if (ret) {
737 goto error;
738 }
7a485870 739
5eb91c98
DG
740 /* Check for data on kernel pipe */
741 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
742 ret = read(kernel_poll_pipe[0], &tmp, 1);
743 update_poll_flag = 1;
744 continue;
745 } else {
746 /*
747 * New CPU detected by the kernel. Adding kernel stream to
748 * kernel session and updating the kernel consumer
749 */
750 if (revents & LPOLLIN) {
751 ret = update_kernel_stream(pollfd);
752 if (ret < 0) {
753 continue;
754 }
755 break;
756 /*
757 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
758 * and unregister kernel stream at this point.
759 */
7a485870 760 }
7a485870
DG
761 }
762 }
763 }
764
765error:
766 DBG("Kernel thread dying");
273ea72c
DG
767 close(kernel_poll_pipe[0]);
768 close(kernel_poll_pipe[1]);
5eb91c98
DG
769
770 lttng_poll_clean(&events);
771
7a485870
DG
772 return NULL;
773}
774
1d4b027a 775/*
d063d709 776 * This thread manage the kconsumerd error sent back to the session daemon.
1d4b027a
DG
777 */
778static void *thread_manage_kconsumerd(void *data)
779{
5eb91c98
DG
780 int sock = 0, i, ret, pollfd;
781 uint32_t revents, nb_fd;
1d4b027a 782 enum lttcomm_return_code code;
5eb91c98 783 struct lttng_poll_event events;
1d4b027a
DG
784
785 DBG("[thread] Manage kconsumerd started");
786
787 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
788 if (ret < 0) {
789 goto error;
790 }
791
5eb91c98
DG
792 /*
793 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
794 * Nothing more will be added to this poll set.
795 */
796 ret = create_thread_poll_set(&events, 2);
797 if (ret < 0) {
798 goto error;
799 }
273ea72c 800
5eb91c98
DG
801 ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP);
802 if (ret < 0) {
803 goto error;
804 }
805
806 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
807
808 /* Inifinite blocking call, waiting for transmission */
5eb91c98 809 ret = lttng_poll_wait(&events, -1);
273ea72c 810 if (ret < 0) {
273ea72c
DG
811 goto error;
812 }
813
5eb91c98
DG
814 for (i = 0; i < nb_fd; i++) {
815 /* Fetch once the poll data */
816 revents = LTTNG_POLL_GETEV(&events, i);
817 pollfd = LTTNG_POLL_GETFD(&events, i);
818
819 /* Thread quit pipe has been closed. Killing thread. */
820 ret = check_thread_quit_pipe(pollfd, revents);
821 if (ret) {
822 goto error;
823 }
824
825 /* Event on the registration socket */
826 if (pollfd == kconsumerd_err_sock) {
827 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
828 ERR("Kconsumerd err socket poll error");
829 goto error;
830 }
831 }
273ea72c
DG
832 }
833
1d4b027a
DG
834 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
835 if (sock < 0) {
836 goto error;
837 }
838
712ea556 839 /* Getting status code from kconsumerd */
54d01ffb
DG
840 ret = lttcomm_recv_unix_sock(sock, &code,
841 sizeof(enum lttcomm_return_code));
1d4b027a
DG
842 if (ret <= 0) {
843 goto error;
844 }
845
846 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
54d01ffb
DG
847 kconsumerd_cmd_sock =
848 lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
1d4b027a 849 if (kconsumerd_cmd_sock < 0) {
712ea556 850 sem_post(&kconsumerd_sem);
1d4b027a
DG
851 perror("kconsumerd connect");
852 goto error;
853 }
854 /* Signal condition to tell that the kconsumerd is ready */
855 sem_post(&kconsumerd_sem);
856 DBG("Kconsumerd command socket ready");
857 } else {
6f61d021 858 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG
859 lttcomm_get_readable_code(-code));
860 goto error;
861 }
862
54d01ffb 863 /* Remove the kconsumerd error sock since we've established a connexion */
5eb91c98 864 ret = lttng_poll_del(&events, kconsumerd_err_sock);
72079cae 865 if (ret < 0) {
72079cae
DG
866 goto error;
867 }
868
5eb91c98
DG
869 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
870 if (ret < 0) {
72079cae 871 goto error;
5eb91c98
DG
872 }
873
874 /* Update number of fd */
875 nb_fd = LTTNG_POLL_GETNB(&events);
876
877 /* Inifinite blocking call, waiting for transmission */
878 ret = lttng_poll_wait(&events, -1);
879 if (ret < 0) {
72079cae
DG
880 goto error;
881 }
882
5eb91c98
DG
883 for (i = 0; i < nb_fd; i++) {
884 /* Fetch once the poll data */
885 revents = LTTNG_POLL_GETEV(&events, i);
886 pollfd = LTTNG_POLL_GETFD(&events, i);
887
888 /* Thread quit pipe has been closed. Killing thread. */
889 ret = check_thread_quit_pipe(pollfd, revents);
890 if (ret) {
891 goto error;
892 }
893
894 /* Event on the kconsumerd socket */
895 if (pollfd == sock) {
896 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
897 ERR("Kconsumerd err socket second poll error");
898 goto error;
899 }
900 }
901 }
902
712ea556 903 /* Wait for any kconsumerd error */
54d01ffb
DG
904 ret = lttcomm_recv_unix_sock(sock, &code,
905 sizeof(enum lttcomm_return_code));
712ea556
DG
906 if (ret <= 0) {
907 ERR("Kconsumerd closed the command socket");
908 goto error;
6f61d021 909 }
1d4b027a 910
712ea556
DG
911 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
912
1d4b027a 913error:
6f61d021 914 DBG("Kconsumerd thread dying");
5eb91c98
DG
915 close(kconsumerd_err_sock);
916 close(kconsumerd_cmd_sock);
917 close(sock);
273ea72c
DG
918
919 unlink(kconsumerd_err_unix_sock_path);
920 unlink(kconsumerd_cmd_unix_sock_path);
273ea72c 921 kconsumerd_pid = 0;
1d4b027a 922
5eb91c98 923 lttng_poll_clean(&events);
0177d773 924
5eb91c98 925 return NULL;
099e26bd
DG
926}
927
099e26bd
DG
928/*
929 * This thread manage application communication.
1d4b027a
DG
930 */
931static void *thread_manage_apps(void *data)
099e26bd 932{
5eb91c98
DG
933 int i, ret, pollfd;
934 uint32_t revents, nb_fd;
099e26bd 935 struct ust_command ust_cmd;
5eb91c98 936 struct lttng_poll_event events;
099e26bd
DG
937
938 DBG("[thread] Manage application started");
939
5eb91c98
DG
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
099e26bd 944
5eb91c98
DG
945 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
946 if (ret < 0) {
947 goto error;
948 }
099e26bd 949
5eb91c98
DG
950 while (1) {
951 /* Zeroed the events structure */
952 lttng_poll_reset(&events);
0177d773 953
5eb91c98 954 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
955
956 DBG("Apps thread polling on %d fds", nb_fd);
957
958 /* Inifinite blocking call, waiting for transmission */
5eb91c98 959 ret = lttng_poll_wait(&events, -1);
099e26bd 960 if (ret < 0) {
099e26bd
DG
961 goto error;
962 }
963
5eb91c98
DG
964 for (i = 0; i < nb_fd; i++) {
965 /* Fetch once the poll data */
966 revents = LTTNG_POLL_GETEV(&events, i);
967 pollfd = LTTNG_POLL_GETFD(&events, i);
968
969 /* Thread quit pipe has been closed. Killing thread. */
970 ret = check_thread_quit_pipe(pollfd, revents);
971 if (ret) {
099e26bd 972 goto error;
5eb91c98 973 }
099e26bd 974
5eb91c98
DG
975 /* Inspect the apps cmd pipe */
976 if (pollfd == apps_cmd_pipe[0]) {
977 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
978 ERR("Apps command pipe error");
0177d773 979 goto error;
5eb91c98
DG
980 } else if (revents & LPOLLIN) {
981 /* Empty pipe */
982 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
983 if (ret < 0 || ret < sizeof(ust_cmd)) {
984 perror("read apps cmd pipe");
985 goto error;
986 }
099e26bd 987
5eb91c98 988 /* Register applicaton to the session daemon */
54d01ffb
DG
989 ret = register_traceable_app(&ust_cmd.reg_msg,
990 ust_cmd.sock);
5eb91c98
DG
991 if (ret < 0) {
992 /* Only critical ENOMEM error can be returned here */
993 goto error;
994 }
995
996 ret = ustctl_register_done(ust_cmd.sock);
997 if (ret < 0) {
998 /*
999 * If the registration is not possible, we simply
1000 * unregister the apps and continue
1001 */
1002 unregister_traceable_app(ust_cmd.sock);
1003 } else {
1004 /*
1005 * We just need here to monitor the close of the UST
1006 * socket and poll set monitor those by default.
1007 */
1008 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1009 if (ret < 0) {
1010 goto error;
1011 }
1012
54d01ffb
DG
1013 DBG("Apps with sock %d added to poll set",
1014 ust_cmd.sock);
5eb91c98
DG
1015 }
1016 break;
0177d773 1017 }
5eb91c98
DG
1018 } else {
1019 /*
54d01ffb
DG
1020 * At this point, we know that a registered application made
1021 * the event at poll_wait.
5eb91c98
DG
1022 */
1023 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1024 /* Removing from the poll set */
1025 ret = lttng_poll_del(&events, pollfd);
1026 if (ret < 0) {
1027 goto error;
1028 }
099e26bd 1029
5eb91c98
DG
1030 /* Socket closed */
1031 unregister_traceable_app(pollfd);
1032 break;
1033 }
099e26bd
DG
1034 }
1035 }
099e26bd
DG
1036 }
1037
1038error:
1039 DBG("Application communication apps dying");
1040 close(apps_cmd_pipe[0]);
1041 close(apps_cmd_pipe[1]);
1042
5eb91c98 1043 lttng_poll_clean(&events);
099e26bd
DG
1044
1045 return NULL;
1046}
1047
1048/*
1049 * Dispatch request from the registration threads to the application
1050 * communication thread.
1051 */
1052static void *thread_dispatch_ust_registration(void *data)
1053{
1054 int ret;
1055 struct cds_wfq_node *node;
1056 struct ust_command *ust_cmd = NULL;
1057
1058 DBG("[thread] Dispatch UST command started");
1059
1060 while (!dispatch_thread_exit) {
1061 /* Atomically prepare the queue futex */
1062 futex_nto1_prepare(&ust_cmd_queue.futex);
1063
1064 do {
1065 /* Dequeue command for registration */
1066 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1067 if (node == NULL) {
1068 DBG("Waked up but nothing in the UST command queue");
1069 /* Continue thread execution */
1070 break;
1071 }
1072
1073 ust_cmd = caa_container_of(node, struct ust_command, node);
1074
2f50c8a3
DG
1075 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1076 " gid:%d sock:%d name:%s (version %d.%d)",
1077 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1078 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1079 ust_cmd->sock, ust_cmd->reg_msg.name,
1080 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1081 /*
1082 * Inform apps thread of the new application registration. This
1083 * call is blocking so we can be assured that the data will be read
1084 * at some point in time or wait to the end of the world :)
1085 */
1086 ret = write(apps_cmd_pipe[1], ust_cmd,
1087 sizeof(struct ust_command));
1088 if (ret < 0) {
1089 perror("write apps cmd pipe");
1090 if (errno == EBADF) {
1091 /*
1092 * We can't inform the application thread to process
1093 * registration. We will exit or else application
1094 * registration will not occur and tracing will never
1095 * start.
1096 */
1097 goto error;
1098 }
1099 }
1100 free(ust_cmd);
1101 } while (node != NULL);
1102
1103 /* Futex wait on queue. Blocking call on futex() */
1104 futex_nto1_wait(&ust_cmd_queue.futex);
1105 }
1106
1107error:
1108 DBG("Dispatch thread dying");
1109 return NULL;
1110}
1111
1112/*
1113 * This thread manage application registration.
1114 */
1115static void *thread_registration_apps(void *data)
1d4b027a 1116{
5eb91c98
DG
1117 int sock = 0, i, ret, pollfd;
1118 uint32_t revents, nb_fd;
1119 struct lttng_poll_event events;
099e26bd
DG
1120 /*
1121 * Get allocated in this thread, enqueued to a global queue, dequeued and
1122 * freed in the manage apps thread.
1123 */
1124 struct ust_command *ust_cmd = NULL;
1d4b027a 1125
099e26bd 1126 DBG("[thread] Manage application registration started");
1d4b027a
DG
1127
1128 ret = lttcomm_listen_unix_sock(apps_sock);
1129 if (ret < 0) {
1130 goto error;
1131 }
1132
5eb91c98
DG
1133 /*
1134 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1135 * more will be added to this poll set.
1136 */
1137 ret = create_thread_poll_set(&events, 2);
1138 if (ret < 0) {
1139 goto error;
1140 }
273ea72c 1141
5eb91c98
DG
1142 /* Add the application registration socket */
1143 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1144 if (ret < 0) {
1145 goto error;
1146 }
273ea72c 1147
1d4b027a 1148 /* Notify all applications to register */
0fdd1e2c
DG
1149 ret = notify_ust_apps(1);
1150 if (ret < 0) {
1151 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1152 "Execution continues but there might be problem for already\n"
1153 "running applications that wishes to register.");
0fdd1e2c 1154 }
1d4b027a
DG
1155
1156 while (1) {
1157 DBG("Accepting application registration");
273ea72c 1158
5eb91c98
DG
1159 nb_fd = LTTNG_POLL_GETNB(&events);
1160
273ea72c 1161 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1162 ret = lttng_poll_wait(&events, -1);
273ea72c 1163 if (ret < 0) {
273ea72c
DG
1164 goto error;
1165 }
1166
5eb91c98
DG
1167 for (i = 0; i < nb_fd; i++) {
1168 /* Fetch once the poll data */
1169 revents = LTTNG_POLL_GETEV(&events, i);
1170 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1171
5eb91c98
DG
1172 /* Thread quit pipe has been closed. Killing thread. */
1173 ret = check_thread_quit_pipe(pollfd, revents);
1174 if (ret) {
90014c57
DG
1175 goto error;
1176 }
1d4b027a 1177
5eb91c98
DG
1178 /* Event on the registration socket */
1179 if (pollfd == apps_sock) {
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 ERR("Register apps socket poll error");
1182 goto error;
1183 } else if (revents & LPOLLIN) {
1184 sock = lttcomm_accept_unix_sock(apps_sock);
1185 if (sock < 0) {
1186 goto error;
1187 }
099e26bd 1188
5eb91c98
DG
1189 /* Create UST registration command for enqueuing */
1190 ust_cmd = malloc(sizeof(struct ust_command));
1191 if (ust_cmd == NULL) {
1192 perror("ust command malloc");
1193 goto error;
1194 }
1d4b027a 1195
5eb91c98
DG
1196 /*
1197 * Using message-based transmissions to ensure we don't
1198 * have to deal with partially received messages.
1199 */
1200 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1201 sizeof(struct ust_register_msg));
1202 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1203 if (ret < 0) {
1204 perror("lttcomm_recv_unix_sock register apps");
1205 } else {
1206 ERR("Wrong size received on apps register");
1207 }
1208 free(ust_cmd);
1209 close(sock);
1210 continue;
1211 }
099e26bd 1212
5eb91c98 1213 ust_cmd->sock = sock;
099e26bd 1214
5eb91c98
DG
1215 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1216 " gid:%d sock:%d name:%s (version %d.%d)",
1217 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1218 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1219 ust_cmd->sock, ust_cmd->reg_msg.name,
1220 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1221
5eb91c98
DG
1222 /*
1223 * Lock free enqueue the registration request. The red pill
54d01ffb 1224 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1225 */
1226 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1227
1228 /*
1229 * Wake the registration queue futex. Implicit memory
1230 * barrier with the exchange in cds_wfq_enqueue.
1231 */
1232 futex_nto1_wake(&ust_cmd_queue.futex);
1233 }
1234 }
90014c57 1235 }
1d4b027a
DG
1236 }
1237
1238error:
0fdd1e2c
DG
1239 DBG("UST Registration thread dying");
1240
1241 /* Notify that the registration thread is gone */
1242 notify_ust_apps(0);
1243
1244 close(apps_sock);
1245 close(sock);
273ea72c 1246 unlink(apps_unix_sock_path);
0fdd1e2c 1247
5eb91c98
DG
1248 lttng_poll_clean(&events);
1249
1d4b027a
DG
1250 return NULL;
1251}
1252
8c0faa1d 1253/*
d063d709
DG
1254 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
1255 * exec or it will fails.
8c0faa1d 1256 */
693bd40b 1257static int spawn_kconsumerd_thread(void)
8c0faa1d
DG
1258{
1259 int ret;
1260
1261 /* Setup semaphore */
1262 sem_init(&kconsumerd_sem, 0, 0);
1263
54d01ffb
DG
1264 ret = pthread_create(&kconsumerd_thread, NULL,
1265 thread_manage_kconsumerd, (void *) NULL);
8c0faa1d
DG
1266 if (ret != 0) {
1267 perror("pthread_create kconsumerd");
1268 goto error;
1269 }
1270
693bd40b 1271 /* Wait for the kconsumerd thread to be ready */
8c0faa1d
DG
1272 sem_wait(&kconsumerd_sem);
1273
712ea556
DG
1274 if (kconsumerd_pid == 0) {
1275 ERR("Kconsumerd did not start");
1276 goto error;
1277 }
1278
8c0faa1d
DG
1279 return 0;
1280
1281error:
712ea556 1282 ret = LTTCOMM_KERN_CONSUMER_FAIL;
8c0faa1d
DG
1283 return ret;
1284}
1285
d9800920
DG
1286/*
1287 * Join kernel consumer thread
1288 */
cf3af59e
MD
1289static int join_kconsumerd_thread(void)
1290{
1291 void *status;
1292 int ret;
1293
1294 if (kconsumerd_pid != 0) {
1295 ret = kill(kconsumerd_pid, SIGTERM);
1296 if (ret) {
1297 ERR("Error killing kconsumerd");
1298 return ret;
1299 }
1300 return pthread_join(kconsumerd_thread, &status);
1301 } else {
1302 return 0;
1303 }
1304}
1305
8c0faa1d 1306/*
d063d709 1307 * Fork and exec a kernel consumer daemon (kconsumerd).
8c0faa1d 1308 *
d063d709 1309 * Return pid if successful else -1.
8c0faa1d 1310 */
693bd40b 1311static pid_t spawn_kconsumerd(void)
8c0faa1d
DG
1312{
1313 int ret;
1314 pid_t pid;
53086306 1315 const char *verbosity;
8c0faa1d 1316
c49dc785
DG
1317 DBG("Spawning kconsumerd");
1318
8c0faa1d
DG
1319 pid = fork();
1320 if (pid == 0) {
1321 /*
1322 * Exec kconsumerd.
1323 */
31f73cc9 1324 if (opt_verbose > 1 || opt_verbose_kconsumerd) {
53086306
DG
1325 verbosity = "--verbose";
1326 } else {
1327 verbosity = "--quiet";
1328 }
54d01ffb
DG
1329 execl(INSTALL_BIN_PATH "/ltt-kconsumerd",
1330 "ltt-kconsumerd", verbosity, NULL);
8c0faa1d
DG
1331 if (errno != 0) {
1332 perror("kernel start consumer exec");
1333 }
1334 exit(EXIT_FAILURE);
1335 } else if (pid > 0) {
1336 ret = pid;
1337 goto error;
1338 } else {
1339 perror("kernel start consumer fork");
1340 ret = -errno;
1341 goto error;
1342 }
1343
1344error:
1345 return ret;
1346}
1347
693bd40b 1348/*
d063d709 1349 * Spawn the kconsumerd daemon and session daemon thread.
693bd40b
DG
1350 */
1351static int start_kconsumerd(void)
1352{
1353 int ret;
1354
693bd40b 1355 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785 1356 if (kconsumerd_pid != 0) {
817153bb 1357 pthread_mutex_unlock(&kconsumerd_pid_mutex);
c49dc785
DG
1358 goto end;
1359 }
693bd40b 1360
c49dc785
DG
1361 ret = spawn_kconsumerd();
1362 if (ret < 0) {
1363 ERR("Spawning kconsumerd failed");
1364 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1365 pthread_mutex_unlock(&kconsumerd_pid_mutex);
1366 goto error;
693bd40b 1367 }
c49dc785
DG
1368
1369 /* Setting up the global kconsumerd_pid */
1370 kconsumerd_pid = ret;
693bd40b
DG
1371 pthread_mutex_unlock(&kconsumerd_pid_mutex);
1372
6f61d021
DG
1373 DBG("Kconsumerd pid %d", ret);
1374
693bd40b 1375 DBG("Spawning kconsumerd thread");
693bd40b
DG
1376 ret = spawn_kconsumerd_thread();
1377 if (ret < 0) {
1378 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG
1379 goto error;
1380 }
1381
c49dc785 1382end:
693bd40b
DG
1383 return 0;
1384
1385error:
1386 return ret;
1387}
1388
b73401da 1389/*
d063d709 1390 * modprobe_kernel_modules
b73401da
DG
1391 */
1392static int modprobe_kernel_modules(void)
1393{
ab147185 1394 int ret = 0, i;
b73401da
DG
1395 char modprobe[256];
1396
ab147185
MD
1397 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1398 ret = snprintf(modprobe, sizeof(modprobe),
1399 "/sbin/modprobe %s%s",
1400 kernel_modules_list[i].required ? "" : "--quiet ",
1401 kernel_modules_list[i].name);
b73401da
DG
1402 if (ret < 0) {
1403 perror("snprintf modprobe");
1404 goto error;
1405 }
ab147185 1406 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1407 ret = system(modprobe);
ab147185
MD
1408 if (ret == -1) {
1409 ERR("Unable to launch modprobe for module %s",
1410 kernel_modules_list[i].name);
1411 } else if (kernel_modules_list[i].required
d9800920 1412 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1413 ERR("Unable to load module %s",
1414 kernel_modules_list[i].name);
1415 } else {
1416 DBG("Modprobe successfully %s",
1417 kernel_modules_list[i].name);
1418 }
1419 }
1420
1421error:
1422 return ret;
1423}
1424
b73401da 1425/*
d063d709 1426 * mount_debugfs
b73401da
DG
1427 */
1428static int mount_debugfs(char *path)
1429{
1430 int ret;
1431 char *type = "debugfs";
1432
996b65c8 1433 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da
DG
1434 if (ret < 0) {
1435 goto error;
1436 }
1437
1438 ret = mount(type, path, type, 0, NULL);
1439 if (ret < 0) {
1440 perror("mount debugfs");
1441 goto error;
1442 }
1443
1444 DBG("Mounted debugfs successfully at %s", path);
1445
1446error:
1447 return ret;
1448}
1449
8c0faa1d 1450/*
d063d709 1451 * Setup necessary data for kernel tracer action.
8c0faa1d 1452 */
f3ed775e 1453static void init_kernel_tracer(void)
8c0faa1d 1454{
b73401da
DG
1455 int ret;
1456 char *proc_mounts = "/proc/mounts";
1457 char line[256];
684d34d2 1458 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1459 FILE *fp;
1460
1461 /* Detect debugfs */
1462 fp = fopen(proc_mounts, "r");
1463 if (fp == NULL) {
1464 ERR("Unable to probe %s", proc_mounts);
1465 goto error;
1466 }
1467
1468 while (fgets(line, sizeof(line), fp) != NULL) {
1469 if (strstr(line, "debugfs") != NULL) {
1470 /* Remove first string */
1471 strtok(line, " ");
1472 /* Dup string here so we can reuse line later on */
1473 debugfs_path = strdup(strtok(NULL, " "));
1474 DBG("Got debugfs path : %s", debugfs_path);
1475 break;
1476 }
1477 }
1478
1479 fclose(fp);
1480
1481 /* Mount debugfs if needded */
1482 if (debugfs_path == NULL) {
1483 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1484 if (ret < 0) {
1485 perror("asprintf debugfs path");
1486 goto error;
1487 }
1488 ret = mount_debugfs(debugfs_path);
1489 if (ret < 0) {
1490 goto error;
1491 }
1492 }
1493
1494 /* Modprobe lttng kernel modules */
1495 ret = modprobe_kernel_modules();
1496 if (ret < 0) {
1497 goto error;
1498 }
1499
1500 /* Setup lttng kernel path */
1501 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1502 if (ret < 0) {
1503 perror("asprintf lttng path");
1504 goto error;
1505 }
1506
1507 /* Open debugfs lttng */
1508 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1509 if (kernel_tracer_fd < 0) {
b73401da
DG
1510 DBG("Failed to open %s", lttng_path);
1511 goto error;
8c0faa1d
DG
1512 }
1513
b73401da
DG
1514 free(lttng_path);
1515 free(debugfs_path);
f3ed775e 1516 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1517 return;
1518
1519error:
1520 if (lttng_path) {
1521 free(lttng_path);
1522 }
1523 if (debugfs_path) {
1524 free(debugfs_path);
1525 }
1526 WARN("No kernel tracer available");
1527 kernel_tracer_fd = 0;
1528 return;
f3ed775e 1529}
33a2b854 1530
f3ed775e 1531/*
54d01ffb 1532 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1533 */
54d01ffb 1534static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1535{
f40799e8 1536 int ret = 0;
8c0faa1d 1537
f3ed775e 1538 if (session->kconsumer_fds_sent == 0) {
d9800920 1539 /*
54d01ffb
DG
1540 * Assign default kernel consumer socket if no consumer assigned to the
1541 * kernel session. At this point, it's NOT suppose to be 0 but this is
1542 * an extra security check.
d9800920
DG
1543 */
1544 if (session->consumer_fd == 0) {
1545 session->consumer_fd = kconsumerd_cmd_sock;
1546 }
1547
1548 ret = send_kconsumerd_fds(session);
f3ed775e 1549 if (ret < 0) {
f3ed775e
DG
1550 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1551 goto error;
1552 }
1d4b027a 1553
f3ed775e
DG
1554 session->kconsumer_fds_sent = 1;
1555 }
1d4b027a
DG
1556
1557error:
1558 return ret;
8c0faa1d
DG
1559}
1560
0177d773
DG
1561/*
1562 * Create an UST session and add it to the session ust list.
1563 */
1564static int create_ust_session(pid_t pid, struct ltt_session *session)
1565{
1566 int ret = -1;
1567 struct ltt_ust_session *lus;
1568
1569 DBG("Creating UST session");
1570
1571 lus = trace_ust_create_session(session->path, pid);
1572 if (lus == NULL) {
1573 goto error;
1574 }
1575
1576 ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG,
1577 geteuid(), allowed_group());
1578 if (ret < 0) {
1579 if (ret != -EEXIST) {
1580 ERR("Trace directory creation error");
1581 goto error;
1582 }
1583 }
1584
1585 /* Create session on the UST tracer */
1586 ret = ustctl_create_session(lus);
1587 if (ret < 0) {
1588 goto error;
1589 }
1590
1591 return 0;
1592
1593error:
1594 free(lus);
1595 return ret;
1596}
1597
333f285e 1598/*
d063d709 1599 * Create a kernel tracer session then create the default channel.
333f285e 1600 */
f3ed775e 1601static int create_kernel_session(struct ltt_session *session)
333f285e 1602{
f3ed775e 1603 int ret;
f3ed775e
DG
1604
1605 DBG("Creating kernel session");
1606
1607 ret = kernel_create_session(session, kernel_tracer_fd);
1608 if (ret < 0) {
1609 ret = LTTCOMM_KERN_SESS_FAIL;
1610 goto error;
333f285e
DG
1611 }
1612
d9800920
DG
1613 /* Set kernel consumer socket fd */
1614 if (kconsumerd_cmd_sock) {
1615 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
1616 }
1617
63053e7c
DG
1618 ret = mkdir_recursive(session->kernel_session->trace_path,
1619 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1620 if (ret < 0) {
996b65c8 1621 if (ret != -EEXIST) {
7a485870
DG
1622 ERR("Trace directory creation error");
1623 goto error;
1624 }
1625 }
1626
f3ed775e
DG
1627error:
1628 return ret;
333f285e
DG
1629}
1630
6c9cc2ab
DG
1631/*
1632 * Using the session list, filled a lttng_session array to send back to the
1633 * client for session listing.
1634 *
1635 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1636 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1637 */
1638static void list_lttng_sessions(struct lttng_session *sessions)
1639{
1640 int i = 0;
1641 struct ltt_session *session;
1642
1643 DBG("Getting all available session");
1644 /*
1645 * Iterate over session list and append data after the control struct in
1646 * the buffer.
1647 */
1648 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1649 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1650 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1651 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1652 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1653 i++;
1654 }
1655}
1656
9f19cc17
DG
1657/*
1658 * Fill lttng_channel array of all channels.
1659 */
1660static void list_lttng_channels(struct ltt_session *session,
1661 struct lttng_channel *channels)
1662{
1663 int i = 0;
1664 struct ltt_kernel_channel *kchan;
1665
1666 DBG("Listing channels for session %s", session->name);
1667
1668 /* Kernel channels */
1669 if (session->kernel_session != NULL) {
54d01ffb
DG
1670 cds_list_for_each_entry(kchan,
1671 &session->kernel_session->channel_list.head, list) {
9f19cc17
DG
1672 /* Copy lttng_channel struct to array */
1673 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1674 channels[i].enabled = kchan->enabled;
1675 i++;
1676 }
1677 }
1678
1679 /* TODO: Missing UST listing */
1680}
1681
1682/*
1683 * Fill lttng_event array of all events in the channel.
1684 */
1685static void list_lttng_events(struct ltt_kernel_channel *kchan,
1686 struct lttng_event *events)
1687{
1688 /*
1689 * TODO: This is ONLY kernel. Need UST support.
1690 */
1691 int i = 0;
1692 struct ltt_kernel_event *event;
1693
1694 DBG("Listing events for channel %s", kchan->channel->name);
1695
1696 /* Kernel channels */
1697 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1698 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1699 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG
1700 events[i].enabled = event->enabled;
1701 switch (event->event->instrumentation) {
1702 case LTTNG_KERNEL_TRACEPOINT:
1703 events[i].type = LTTNG_EVENT_TRACEPOINT;
1704 break;
1705 case LTTNG_KERNEL_KPROBE:
1706 case LTTNG_KERNEL_KRETPROBE:
1707 events[i].type = LTTNG_EVENT_PROBE;
1708 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1709 sizeof(struct lttng_kernel_kprobe));
1710 break;
1711 case LTTNG_KERNEL_FUNCTION:
1712 events[i].type = LTTNG_EVENT_FUNCTION;
1713 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1714 sizeof(struct lttng_kernel_function));
1715 break;
0133c199
MD
1716 case LTTNG_KERNEL_NOOP:
1717 events[i].type = LTTNG_EVENT_NOOP;
1718 break;
a54bd42d
MD
1719 case LTTNG_KERNEL_SYSCALL:
1720 events[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1721 break;
9f19cc17
DG
1722 }
1723 i++;
1724 }
1725}
1726
fac6795d 1727/*
54d01ffb 1728 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1729 */
54d01ffb
DG
1730static int cmd_disable_channel(struct ltt_session *session,
1731 int domain, char *channel_name)
fac6795d 1732{
54d01ffb 1733 int ret;
379473d2 1734
54d01ffb
DG
1735 switch (domain) {
1736 case LTTNG_DOMAIN_KERNEL:
1737 ret = channel_kernel_disable(session->kernel_session,
1738 channel_name);
1739 if (ret != LTTCOMM_OK) {
333f285e
DG
1740 goto error;
1741 }
54d01ffb
DG
1742
1743 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c
MD
1744 break;
1745 default:
54d01ffb
DG
1746 /* TODO: Userspace tracing */
1747 ret = LTTCOMM_NOT_IMPLEMENTED;
1748 goto error;
20fe2104
DG
1749 }
1750
54d01ffb 1751 ret = LTTCOMM_OK;
d65106b1 1752
54d01ffb
DG
1753error:
1754 return ret;
1755}
1756
1757/*
1758 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1759 */
1760static int cmd_enable_channel(struct ltt_session *session, int domain,
1761 char *channel_name, struct lttng_channel *attr)
1762{
1763 int ret;
1764 struct ltt_kernel_channel *kchan;
d65106b1 1765
54d01ffb 1766 switch (domain) {
b579acd9 1767 case LTTNG_DOMAIN_KERNEL:
54d01ffb
DG
1768 kchan = trace_kernel_get_channel_by_name(channel_name,
1769 session->kernel_session);
1770 if (kchan == NULL) {
1771 ret = channel_kernel_create(session->kernel_session,
1772 channel_name, attr, kernel_poll_pipe[1]);
1773 } else {
1774 ret = channel_kernel_enable(session->kernel_session, kchan);
1775 }
1776
b579acd9 1777 if (ret != LTTCOMM_OK) {
d65106b1
DG
1778 goto error;
1779 }
54d01ffb
DG
1780
1781 kernel_wait_quiescent(kernel_tracer_fd);
b579acd9
DG
1782 break;
1783 default:
1784 /* TODO: Userspace tracing */
1785 ret = LTTCOMM_NOT_IMPLEMENTED;
0b97ec54 1786 goto error;
54d01ffb
DG
1787 }
1788
1789 ret = LTTCOMM_OK;
1790
1791error:
1792 return ret;
1793}
1794
1795/*
1796 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1797 */
1798static int cmd_disable_event(struct ltt_session *session, int domain,
1799 char *channel_name, char *event_name)
1800{
1801 int ret;
1802 struct ltt_kernel_channel *kchan;
1803
1804 switch (domain) {
1805 case LTTNG_DOMAIN_KERNEL:
1806 kchan = trace_kernel_get_channel_by_name(channel_name,
1807 session->kernel_session);
1808 if (kchan == NULL) {
1809 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1810 goto error;
d65106b1
DG
1811 }
1812
54d01ffb
DG
1813 ret = event_kernel_disable(session->kernel_session, kchan, event_name);
1814 if (ret != LTTCOMM_OK) {
1815 goto error;
1816 }
1817
1818 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 1819 break;
54d01ffb
DG
1820 default:
1821 /* TODO: Userspace tracing */
1822 ret = LTTCOMM_NOT_IMPLEMENTED;
1823 goto error;
d65106b1 1824 }
26cc6b4e 1825
54d01ffb
DG
1826 ret = LTTCOMM_OK;
1827
1828error:
1829 return ret;
1830}
1831
1832/*
1833 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1834 */
1835static int cmd_disable_event_all(struct ltt_session *session, int domain,
1836 char *channel_name)
1837{
1838 int ret;
1839 struct ltt_kernel_channel *kchan;
1840
1841 switch (domain) {
1842 case LTTNG_DOMAIN_KERNEL:
1843 kchan = trace_kernel_get_channel_by_name(channel_name,
1844 session->kernel_session);
1845 if (kchan == NULL) {
1846 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1847 goto error;
26cc6b4e
DG
1848 }
1849
54d01ffb
DG
1850 ret = event_kernel_disable_all(session->kernel_session, kchan);
1851 if (ret != LTTCOMM_OK) {
0b97ec54 1852 goto error;
26cc6b4e
DG
1853 }
1854
54d01ffb 1855 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 1856 break;
54d01ffb
DG
1857 default:
1858 /* TODO: Userspace tracing */
1859 ret = LTTCOMM_NOT_IMPLEMENTED;
1860 goto error;
26cc6b4e 1861 }
e953ef25 1862
54d01ffb 1863 ret = LTTCOMM_OK;
e953ef25 1864
54d01ffb
DG
1865error:
1866 return ret;
1867}
f5177a38 1868
54d01ffb
DG
1869/*
1870 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1871 */
1872static int cmd_add_context(struct ltt_session *session, int domain,
1873 char *channel_name, char *event_name, struct lttng_event_context *ctx)
1874{
1875 int ret;
f5177a38 1876
54d01ffb
DG
1877 switch (domain) {
1878 case LTTNG_DOMAIN_KERNEL:
1879 /* Add kernel context to kernel tracer */
1880 ret = context_kernel_add(session->kernel_session, ctx,
1881 event_name, channel_name);
1882 if (ret != LTTCOMM_OK) {
f5177a38 1883 goto error;
e953ef25
DG
1884 }
1885
e953ef25 1886 break;
54d01ffb
DG
1887 default:
1888 /* TODO: Userspace tracing */
1889 ret = LTTCOMM_NOT_IMPLEMENTED;
1890 goto error;
e953ef25 1891 }
950131af 1892
54d01ffb 1893 ret = LTTCOMM_OK;
950131af 1894
54d01ffb
DG
1895error:
1896 return ret;
1897}
1898
1899/*
1900 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1901 */
1902static int cmd_enable_event(struct ltt_session *session, int domain,
1903 char *channel_name, struct lttng_event *event)
1904{
1905 int ret;
1906 struct ltt_kernel_channel *kchan;
1907
1908 switch (domain) {
1909 case LTTNG_DOMAIN_KERNEL:
1910 kchan = trace_kernel_get_channel_by_name(channel_name,
1911 session->kernel_session);
1912 if (kchan == NULL) {
1913 /* This call will notify the kernel thread */
1914 ret = channel_kernel_create(session->kernel_session, channel_name,
1915 NULL, kernel_poll_pipe[1]);
1916 if (ret != LTTCOMM_OK) {
f5177a38
DG
1917 goto error;
1918 }
54d01ffb 1919 }
950131af 1920
54d01ffb
DG
1921 /* Get the newly created kernel channel pointer */
1922 kchan = trace_kernel_get_channel_by_name(channel_name,
1923 session->kernel_session);
1924 if (kchan == NULL) {
1925 /* This sould not happen... */
1926 ret = LTTCOMM_FATAL;
1927 goto error;
1928 }
f5177a38 1929
54d01ffb
DG
1930 ret = event_kernel_enable(session->kernel_session, kchan, event);
1931 if (ret != LTTCOMM_OK) {
f5177a38 1932 goto error;
950131af
DG
1933 }
1934
54d01ffb 1935 kernel_wait_quiescent(kernel_tracer_fd);
950131af 1936 break;
54d01ffb
DG
1937 default:
1938 /* TODO: Userspace tracing */
1939 ret = LTTCOMM_NOT_IMPLEMENTED;
1940 goto error;
950131af 1941 }
d36b8583 1942
54d01ffb 1943 ret = LTTCOMM_OK;
d36b8583 1944
54d01ffb
DG
1945error:
1946 return ret;
1947}
7d29a247 1948
54d01ffb
DG
1949/*
1950 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1951 */
1952static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 1953 char *channel_name, int event_type)
54d01ffb
DG
1954{
1955 int ret;
1956 struct ltt_kernel_channel *kchan;
7d29a247 1957
54d01ffb
DG
1958 switch (domain) {
1959 case LTTNG_DOMAIN_KERNEL:
1960 kchan = trace_kernel_get_channel_by_name(channel_name,
1961 session->kernel_session);
1962 if (kchan == NULL) {
1963 /* This call will notify the kernel thread */
1964 ret = channel_kernel_create(session->kernel_session, channel_name,
1965 NULL, kernel_poll_pipe[1]);
1966 if (ret != LTTCOMM_OK) {
1967 goto error;
d36b8583 1968 }
54d01ffb 1969 }
0d0c377a 1970
54d01ffb
DG
1971 /* Get the newly created kernel channel pointer */
1972 kchan = trace_kernel_get_channel_by_name(channel_name,
1973 session->kernel_session);
1974 if (kchan == NULL) {
1975 /* This sould not happen... */
1976 ret = LTTCOMM_FATAL;
1977 goto error;
1978 }
0fdd1e2c 1979
8c9ae521
DG
1980 if (event_type == LTTNG_KERNEL_SYSCALL) {
1981 ret = event_kernel_enable_syscalls(session->kernel_session,
1982 kchan, kernel_tracer_fd);
1983 } else {
1984 /*
1985 * This call enables all LTTNG_KERNEL_TRACEPOINTS and events
1986 * already registered to the channel.
1987 */
1988 ret = event_kernel_enable_all(session->kernel_session,
1989 kchan, kernel_tracer_fd);
1990 }
1991
54d01ffb 1992 if (ret != LTTCOMM_OK) {
0d0c377a 1993 goto error;
d36b8583
DG
1994 }
1995
54d01ffb 1996 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 1997 break;
54d01ffb
DG
1998 default:
1999 /* TODO: Userspace tracing */
2000 ret = LTTCOMM_NOT_IMPLEMENTED;
2001 goto error;
d36b8583 2002 }
f3ed775e 2003
54d01ffb
DG
2004 ret = LTTCOMM_OK;
2005
2006error:
2007 return ret;
2008}
2009
2010/*
2011 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2012 */
2013static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2014{
2015 int ret;
2016 ssize_t nb_events = 0;
2017
2018 switch (domain) {
2019 case LTTNG_DOMAIN_KERNEL:
2020 nb_events = kernel_list_events(kernel_tracer_fd, events);
2021 if (nb_events < 0) {
2022 ret = LTTCOMM_KERN_LIST_FAIL;
2023 goto error;
894be886 2024 }
54d01ffb
DG
2025 break;
2026 default:
2027 /* TODO: Userspace listing */
2028 ret = LTTCOMM_NOT_IMPLEMENTED;
2029 goto error;
2030 }
894be886 2031
54d01ffb 2032 return nb_events;
7d29a247 2033
54d01ffb
DG
2034error:
2035 /* Return negative value to differentiate return code */
2036 return -ret;
2037}
b389abbe 2038
54d01ffb
DG
2039/*
2040 * Command LTTNG_START_TRACE processed by the client thread.
2041 */
2042static int cmd_start_trace(struct ltt_session *session)
2043{
2044 int ret;
2045 struct ltt_kernel_channel *kchan;
2046 struct ltt_kernel_session *ksession;
b389abbe 2047
54d01ffb
DG
2048 /* Short cut */
2049 ksession = session->kernel_session;
5eb91c98 2050
54d01ffb
DG
2051 /* Kernel tracing */
2052 if (ksession != NULL) {
2053 /* Open kernel metadata */
2054 if (ksession->metadata == NULL) {
2055 ret = kernel_open_metadata(ksession, ksession->trace_path);
2056 if (ret < 0) {
2057 ret = LTTCOMM_KERN_META_FAIL;
2058 goto error;
b389abbe 2059 }
54d01ffb 2060 }
7d29a247 2061
54d01ffb
DG
2062 /* Open kernel metadata stream */
2063 if (ksession->metadata_stream_fd == 0) {
2064 ret = kernel_open_metadata_stream(ksession);
2065 if (ret < 0) {
2066 ERR("Kernel create metadata stream failed");
2067 ret = LTTCOMM_KERN_STREAM_FAIL;
2068 goto error;
2069 }
2070 }
2071
2072 /* For each channel */
2073 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2074 if (kchan->stream_count == 0) {
2075 ret = kernel_open_channel_stream(kchan);
2076 if (ret < 0) {
2077 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2078 goto error;
2079 }
54d01ffb
DG
2080 /* Update the stream global counter */
2081 ksession->stream_count_global += ret;
7d29a247 2082 }
54d01ffb
DG
2083 }
2084
2085 /* Setup kernel consumer socket and send fds to it */
2086 ret = init_kernel_tracing(ksession);
2087 if (ret < 0) {
2088 ret = LTTCOMM_KERN_START_FAIL;
2089 goto error;
2090 }
2091
2092 /* This start the kernel tracing */
2093 ret = kernel_start_session(ksession);
2094 if (ret < 0) {
2095 ret = LTTCOMM_KERN_START_FAIL;
2096 goto error;
2097 }
2098
2099 /* Quiescent wait after starting trace */
2100 kernel_wait_quiescent(kernel_tracer_fd);
2101 }
2102
2103 /* TODO: Start all UST traces */
2104
2105 ret = LTTCOMM_OK;
2106
2107error:
2108 return ret;
2109}
2110
2111/*
2112 * Command LTTNG_STOP_TRACE processed by the client thread.
2113 */
2114static int cmd_stop_trace(struct ltt_session *session)
2115{
2116 int ret;
2117 struct ltt_kernel_channel *kchan;
2118 struct ltt_kernel_session *ksession;
2119
2120 /* Short cut */
2121 ksession = session->kernel_session;
2122
2123 /* Kernel tracer */
2124 if (ksession != NULL) {
2125 DBG("Stop kernel tracing");
2126
2127 /* Flush all buffers before stopping */
2128 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2129 if (ret < 0) {
2130 ERR("Kernel metadata flush failed");
2131 }
f34daff7 2132
54d01ffb
DG
2133 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2134 ret = kernel_flush_buffer(kchan);
0d0c377a 2135 if (ret < 0) {
54d01ffb 2136 ERR("Kernel flush buffer error");
7d29a247 2137 }
54d01ffb 2138 }
19e70852 2139
54d01ffb
DG
2140 ret = kernel_stop_session(ksession);
2141 if (ret < 0) {
2142 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2143 goto error;
f3ed775e 2144 }
54d01ffb
DG
2145
2146 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2147 }
54d01ffb
DG
2148
2149 /* TODO : User-space tracer */
2150
2151 ret = LTTCOMM_OK;
2152
2153error:
2154 return ret;
2155}
2156
2157/*
2158 * Command LTTNG_CREATE_SESSION processed by the client thread.
2159 */
2160static int cmd_create_session(char *name, char *path)
2161{
2162 int ret;
2163
2164 ret = session_create(name, path);
2165 if (ret != LTTCOMM_OK) {
2166 goto error;
2167 }
2168
2169 ret = LTTCOMM_OK;
2170
2171error:
2172 return ret;
2173}
2174
2175/*
2176 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2177 */
2178static int cmd_destroy_session(struct ltt_session *session, char *name)
2179{
2180 int ret;
2181
2182 /* Clean kernel session teardown */
2183 teardown_kernel_session(session);
2184
2185 /*
2186 * Must notify the kernel thread here to update it's poll setin order
2187 * to remove the channel(s)' fd just destroyed.
2188 */
2189 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2190 if (ret < 0) {
2191 perror("write kernel poll pipe");
2192 }
2193
2194 ret = session_destroy(name);
2195
2196 return ret;
2197}
2198
2199/*
2200 * Command LTTNG_CALIBRATE processed by the client thread.
2201 */
2202static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2203{
2204 int ret;
2205
2206 switch (domain) {
2207 case LTTNG_DOMAIN_KERNEL:
33a2b854 2208 {
54d01ffb 2209 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2210
54d01ffb
DG
2211 kcalibrate.type = calibrate->type;
2212 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2213 if (ret < 0) {
54d01ffb
DG
2214 ret = LTTCOMM_KERN_ENABLE_FAIL;
2215 goto error;
33a2b854 2216 }
54d01ffb
DG
2217 break;
2218 }
2219 default:
2220 /* TODO: Userspace tracing */
2221 ret = LTTCOMM_NOT_IMPLEMENTED;
2222 goto error;
2223 }
33a2b854 2224
54d01ffb 2225 ret = LTTCOMM_OK;
33a2b854 2226
54d01ffb
DG
2227error:
2228 return ret;
2229}
7d29a247 2230
54d01ffb
DG
2231/*
2232 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2233 */
2234static int cmd_register_consumer(struct ltt_session *session, int domain,
2235 char *sock_path)
2236{
2237 int ret, sock;
b389abbe 2238
54d01ffb
DG
2239 switch (domain) {
2240 case LTTNG_DOMAIN_KERNEL:
2241 /* Can't register a consumer if there is already one */
2242 if (session->kernel_session->consumer_fd != 0) {
2243 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2244 goto error;
2245 }
2246
2247 sock = lttcomm_connect_unix_sock(sock_path);
2248 if (sock < 0) {
2249 ret = LTTCOMM_CONNECT_FAIL;
2250 goto error;
2251 }
2252
2253 session->kernel_session->consumer_fd = sock;
2254 break;
2255 default:
2256 /* TODO: Userspace tracing */
2257 ret = LTTCOMM_NOT_IMPLEMENTED;
2258 goto error;
2259 }
2260
2261 ret = LTTCOMM_OK;
2262
2263error:
2264 return ret;
2265}
2266
2267/*
2268 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2269 */
2270static ssize_t cmd_list_domains(struct ltt_session *session,
2271 struct lttng_domain **domains)
2272{
2273 int ret;
2274 ssize_t nb_dom = 0;
2275
2276 if (session->kernel_session != NULL) {
2277 nb_dom++;
2278 }
2279
2280 nb_dom += session->ust_session_list.count;
2281
2282 *domains = malloc(nb_dom * sizeof(struct lttng_domain));
2283 if (*domains == NULL) {
2284 ret = -LTTCOMM_FATAL;
2285 goto error;
2286 }
2287
2288 (*domains)[0].type = LTTNG_DOMAIN_KERNEL;
2289
2290 /* TODO: User-space tracer domain support */
2291
2292 return nb_dom;
2293
2294error:
2295 return ret;
2296}
2297
2298/*
2299 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2300 */
2301static ssize_t cmd_list_channels(struct ltt_session *session,
2302 struct lttng_channel **channels)
2303{
2304 int ret;
2305 ssize_t nb_chan = 0;
2306
2307 if (session->kernel_session != NULL) {
2308 nb_chan += session->kernel_session->channel_count;
2309 }
2310
2311 *channels = malloc(nb_chan * sizeof(struct lttng_channel));
2312 if (*channels == NULL) {
2313 ret = -LTTCOMM_FATAL;
2314 goto error;
2315 }
2316
2317 list_lttng_channels(session, *channels);
2318
2319 return nb_chan;
2320
2321error:
2322 return ret;
2323}
2324
2325/*
2326 * Command LTTNG_LIST_EVENTS processed by the client thread.
2327 */
2328static ssize_t cmd_list_events(struct ltt_session *session,
2329 char *channel_name, struct lttng_event **events)
2330{
2331 int ret;
2332 ssize_t nb_event = 0;
2333 struct ltt_kernel_channel *kchan = NULL;
2334
2335 if (session->kernel_session != NULL) {
2336 kchan = trace_kernel_get_channel_by_name(channel_name,
2337 session->kernel_session);
2338 if (kchan == NULL) {
2339 ret = -LTTCOMM_KERN_CHAN_NOT_FOUND;
2340 goto error;
2341 }
2342 nb_event += kchan->event_count;
2343 }
2344
2345 *events = malloc(nb_event * sizeof(struct lttng_event));
2346 if (*events == NULL) {
2347 ret = -LTTCOMM_FATAL;
2348 goto error;
2349 }
2350
2351 list_lttng_events(kchan, *events);
2352
2353 /* TODO: User-space tracer support */
2354
2355 return nb_event;
2356
2357error:
2358 return ret;
2359}
2360
2361/*
2362 * Process the command requested by the lttng client within the command
2363 * context structure. This function make sure that the return structure (llm)
2364 * is set and ready for transmission before returning.
2365 *
2366 * Return any error encountered or 0 for success.
2367 */
2368static int process_client_msg(struct command_ctx *cmd_ctx)
2369{
2370 int ret = LTTCOMM_OK;
2371 int need_kernel_session = 1;
2372
2373 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2374
2375 /*
2376 * Check for command that don't needs to allocate a returned payload. We do
2377 * this here so we don't have to make the call for no payload" at each
2378 * command.
2379 */
2380 switch(cmd_ctx->lsm->cmd_type) {
2381 case LTTNG_LIST_SESSIONS:
2382 case LTTNG_LIST_TRACEPOINTS:
2383 case LTTNG_LIST_DOMAINS:
2384 case LTTNG_LIST_CHANNELS:
2385 case LTTNG_LIST_EVENTS:
2386 break;
2387 default:
2388 /* Setup lttng message with no payload */
2389 ret = setup_lttng_msg(cmd_ctx, 0);
2390 if (ret < 0) {
2391 /* This label does not try to unlock the session */
2392 goto init_setup_error;
2393 }
2394 }
2395
2396 /* Commands that DO NOT need a session. */
2397 switch (cmd_ctx->lsm->cmd_type) {
2398 case LTTNG_CALIBRATE:
2399 case LTTNG_CREATE_SESSION:
2400 case LTTNG_LIST_SESSIONS:
2401 case LTTNG_LIST_TRACEPOINTS:
2402 need_kernel_session = 0;
2403 break;
2404 default:
2405 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
2406 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2407 if (cmd_ctx->session == NULL) {
2408 if (cmd_ctx->lsm->session.name != NULL) {
2409 ret = LTTCOMM_SESS_NOT_FOUND;
2410 } else {
2411 /* If no session name specified */
2412 ret = LTTCOMM_SELECT_SESS;
2413 }
2414 goto error;
2415 } else {
2416 /* Acquire lock for the session */
2417 session_lock(cmd_ctx->session);
2418 }
2419 break;
2420 }
b389abbe 2421
54d01ffb
DG
2422 /*
2423 * Check domain type for specific "pre-action".
2424 */
2425 switch (cmd_ctx->lsm->domain.type) {
2426 case LTTNG_DOMAIN_KERNEL:
2427 /* Kernel tracer check */
2428 if (kernel_tracer_fd == 0) {
2429 /* Basically, load kernel tracer modules */
2430 init_kernel_tracer();
2431 if (kernel_tracer_fd == 0) {
2432 ret = LTTCOMM_KERN_NA;
2433 goto error;
2434 }
2435 }
5eb91c98 2436
54d01ffb
DG
2437 /* Need a session for kernel command */
2438 if (need_kernel_session) {
2439 if (cmd_ctx->session->kernel_session == NULL) {
2440 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2441 if (ret < 0) {
54d01ffb 2442 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2443 goto error;
2444 }
b389abbe 2445 }
7d29a247 2446
54d01ffb
DG
2447 /* Start the kernel consumer daemon */
2448 if (kconsumerd_pid == 0 &&
2449 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2450 ret = start_kconsumerd();
7d29a247 2451 if (ret < 0) {
54d01ffb
DG
2452 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2453 goto error;
950131af 2454 }
33a2b854 2455 }
0d0c377a 2456 }
54d01ffb
DG
2457 break;
2458 default:
2459 /* TODO Userspace tracer */
2460 break;
2461 }
33a2b854 2462
54d01ffb
DG
2463 /* Process by command type */
2464 switch (cmd_ctx->lsm->cmd_type) {
2465 case LTTNG_ADD_CONTEXT:
2466 {
2467 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2468 cmd_ctx->lsm->u.context.channel_name,
2469 cmd_ctx->lsm->u.context.event_name,
2470 &cmd_ctx->lsm->u.context.ctx);
2471 break;
2472 }
2473 case LTTNG_DISABLE_CHANNEL:
2474 {
2475 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2476 cmd_ctx->lsm->u.disable.channel_name);
2477 break;
2478 }
2479 case LTTNG_DISABLE_EVENT:
2480 {
2481 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2482 cmd_ctx->lsm->u.disable.channel_name,
2483 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2484 ret = LTTCOMM_OK;
2485 break;
2486 }
54d01ffb
DG
2487 case LTTNG_DISABLE_ALL_EVENT:
2488 {
2489 DBG("Disabling all kernel event");
2490
2491 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2492 cmd_ctx->lsm->u.disable.channel_name);
2493 break;
2494 }
2495 case LTTNG_ENABLE_CHANNEL:
2496 {
2497 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2498 cmd_ctx->lsm->u.enable.channel_name,
2499 &cmd_ctx->lsm->u.channel.chan);
2500 break;
2501 }
2502 case LTTNG_ENABLE_EVENT:
2503 {
2504 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2505 cmd_ctx->lsm->u.enable.channel_name,
2506 &cmd_ctx->lsm->u.enable.event);
2507 break;
2508 }
2509 case LTTNG_ENABLE_ALL_EVENT:
2510 {
2511 DBG("Enabling all kernel event");
2512
2513 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
2514 cmd_ctx->lsm->u.enable.channel_name,
2515 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
2516 break;
2517 }
052da939 2518 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2519 {
9f19cc17 2520 struct lttng_event *events;
54d01ffb 2521 ssize_t nb_events;
052da939 2522
54d01ffb
DG
2523 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2524 if (nb_events < 0) {
2525 ret = -nb_events;
2526 goto error;
2ef84c95
DG
2527 }
2528
2529 /*
2530 * Setup lttng message with payload size set to the event list size in
2531 * bytes and then copy list into the llm payload.
2532 */
052da939 2533 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2534 if (ret < 0) {
052da939 2535 free(events);
2ef84c95
DG
2536 goto setup_error;
2537 }
2538
2539 /* Copy event list into message payload */
9f19cc17 2540 memcpy(cmd_ctx->llm->payload, events,
052da939 2541 sizeof(struct lttng_event) * nb_events);
2ef84c95 2542
9f19cc17 2543 free(events);
2ef84c95
DG
2544
2545 ret = LTTCOMM_OK;
2546 break;
2547 }
f3ed775e 2548 case LTTNG_START_TRACE:
8c0faa1d 2549 {
54d01ffb 2550 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2551 break;
2552 }
f3ed775e 2553 case LTTNG_STOP_TRACE:
8c0faa1d 2554 {
54d01ffb 2555 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2556 break;
2557 }
5e16da05
MD
2558 case LTTNG_CREATE_SESSION:
2559 {
54d01ffb
DG
2560 ret = cmd_create_session(cmd_ctx->lsm->session.name,
2561 cmd_ctx->lsm->session.path);
5e16da05
MD
2562 break;
2563 }
2564 case LTTNG_DESTROY_SESSION:
2565 {
54d01ffb
DG
2566 ret = cmd_destroy_session(cmd_ctx->session,
2567 cmd_ctx->lsm->session.name);
5461b305 2568 break;
5e16da05 2569 }
9f19cc17 2570 case LTTNG_LIST_DOMAINS:
5e16da05 2571 {
54d01ffb
DG
2572 ssize_t nb_dom;
2573 struct lttng_domain *domains;
5461b305 2574
54d01ffb
DG
2575 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2576 if (nb_dom < 0) {
2577 ret = -nb_dom;
2578 goto error;
ce3d728c 2579 }
520ff687 2580
54d01ffb 2581 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
2582 if (ret < 0) {
2583 goto setup_error;
520ff687 2584 }
57167058 2585
54d01ffb
DG
2586 /* Copy event list into message payload */
2587 memcpy(cmd_ctx->llm->payload, domains,
2588 nb_dom * sizeof(struct lttng_domain));
2589
2590 free(domains);
5e16da05 2591
5461b305 2592 ret = LTTCOMM_OK;
5e16da05
MD
2593 break;
2594 }
9f19cc17 2595 case LTTNG_LIST_CHANNELS:
5e16da05 2596 {
54d01ffb
DG
2597 size_t nb_chan;
2598 struct lttng_channel *channels;
2599
2600 nb_chan = cmd_list_channels(cmd_ctx->session, &channels);
2601 if (nb_chan < 0) {
2602 ret = -nb_chan;
2603 goto error;
5461b305 2604 }
ca95a216 2605
54d01ffb 2606 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
2607 if (ret < 0) {
2608 goto setup_error;
2609 }
9f19cc17 2610
54d01ffb
DG
2611 /* Copy event list into message payload */
2612 memcpy(cmd_ctx->llm->payload, channels,
2613 nb_chan * sizeof(struct lttng_channel));
2614
2615 free(channels);
9f19cc17
DG
2616
2617 ret = LTTCOMM_OK;
5461b305 2618 break;
5e16da05 2619 }
9f19cc17 2620 case LTTNG_LIST_EVENTS:
5e16da05 2621 {
54d01ffb 2622 size_t nb_event;
684d34d2 2623 struct lttng_event *events = NULL;
9f19cc17 2624
54d01ffb
DG
2625 nb_event = cmd_list_events(cmd_ctx->session,
2626 cmd_ctx->lsm->u.list.channel_name, &events);
2627 if (nb_event < 0) {
2628 ret = -nb_event;
2629 goto error;
5461b305 2630 }
ca95a216 2631
54d01ffb 2632 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
2633 if (ret < 0) {
2634 goto setup_error;
2635 }
9f19cc17 2636
54d01ffb
DG
2637 /* Copy event list into message payload */
2638 memcpy(cmd_ctx->llm->payload, events,
2639 nb_event * sizeof(struct lttng_event));
9f19cc17 2640
54d01ffb 2641 free(events);
9f19cc17
DG
2642
2643 ret = LTTCOMM_OK;
5461b305 2644 break;
5e16da05
MD
2645 }
2646 case LTTNG_LIST_SESSIONS:
2647 {
54d01ffb 2648 session_lock_list();
5461b305 2649
6c9cc2ab 2650 if (session_list_ptr->count == 0) {
f3ed775e 2651 ret = LTTCOMM_NO_SESSION;
54d01ffb 2652 session_unlock_list();
5461b305 2653 goto error;
57167058 2654 }
5e16da05 2655
6c9cc2ab
DG
2656 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
2657 session_list_ptr->count);
5461b305 2658 if (ret < 0) {
54d01ffb 2659 session_unlock_list();
5461b305 2660 goto setup_error;
e065084a 2661 }
5e16da05 2662
6c9cc2ab
DG
2663 /* Filled the session array */
2664 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
2665
54d01ffb 2666 session_unlock_list();
5e16da05 2667
5461b305 2668 ret = LTTCOMM_OK;
5e16da05
MD
2669 break;
2670 }
d0254c7c
MD
2671 case LTTNG_CALIBRATE:
2672 {
54d01ffb
DG
2673 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
2674 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
2675 break;
2676 }
d9800920
DG
2677 case LTTNG_REGISTER_CONSUMER:
2678 {
54d01ffb
DG
2679 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2680 cmd_ctx->lsm->u.reg.path);
d9800920
DG
2681 break;
2682 }
5e16da05 2683 default:
5e16da05 2684 ret = LTTCOMM_UND;
5461b305 2685 break;
fac6795d
DG
2686 }
2687
5461b305 2688error:
5461b305
DG
2689 if (cmd_ctx->llm == NULL) {
2690 DBG("Missing llm structure. Allocating one.");
894be886 2691 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
2692 goto setup_error;
2693 }
2694 }
54d01ffb 2695 /* Set return code */
5461b305 2696 cmd_ctx->llm->ret_code = ret;
5461b305 2697setup_error:
b5541356 2698 if (cmd_ctx->session) {
54d01ffb 2699 session_unlock(cmd_ctx->session);
b5541356 2700 }
54d01ffb 2701init_setup_error:
8028d920 2702 return ret;
fac6795d
DG
2703}
2704
1d4b027a 2705/*
d063d709
DG
2706 * This thread manage all clients request using the unix client socket for
2707 * communication.
1d4b027a
DG
2708 */
2709static void *thread_manage_clients(void *data)
2710{
5eb91c98
DG
2711 int sock = 0, ret, i, pollfd;
2712 uint32_t revents, nb_fd;
273ea72c 2713 struct command_ctx *cmd_ctx = NULL;
5eb91c98 2714 struct lttng_poll_event events;
1d4b027a
DG
2715
2716 DBG("[thread] Manage client started");
2717
2718 ret = lttcomm_listen_unix_sock(client_sock);
2719 if (ret < 0) {
2720 goto error;
2721 }
2722
5eb91c98
DG
2723 /*
2724 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2725 * more will be added to this poll set.
2726 */
2727 ret = create_thread_poll_set(&events, 2);
2728 if (ret < 0) {
2729 goto error;
2730 }
273ea72c 2731
5eb91c98
DG
2732 /* Add the application registration socket */
2733 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2734 if (ret < 0) {
2735 goto error;
2736 }
273ea72c 2737
bbd973c2
DG
2738 /*
2739 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
2740 */
2741 if (opt_sig_parent) {
2742 kill(ppid, SIGCHLD);
2743 }
2744
2745 while (1) {
1d4b027a 2746 DBG("Accepting client command ...");
273ea72c 2747
5eb91c98
DG
2748 nb_fd = LTTNG_POLL_GETNB(&events);
2749
273ea72c 2750 /* Inifinite blocking call, waiting for transmission */
5eb91c98 2751 ret = lttng_poll_wait(&events, -1);
273ea72c 2752 if (ret < 0) {
273ea72c
DG
2753 goto error;
2754 }
2755
5eb91c98
DG
2756 for (i = 0; i < nb_fd; i++) {
2757 /* Fetch once the poll data */
2758 revents = LTTNG_POLL_GETEV(&events, i);
2759 pollfd = LTTNG_POLL_GETFD(&events, i);
2760
2761 /* Thread quit pipe has been closed. Killing thread. */
2762 ret = check_thread_quit_pipe(pollfd, revents);
2763 if (ret) {
2764 goto error;
2765 }
2766
2767 /* Event on the registration socket */
2768 if (pollfd == client_sock) {
2769 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2770 ERR("Client socket poll error");
2771 goto error;
2772 }
2773 }
2774 }
2775
2776 DBG("Wait for client response");
2777
2778 sock = lttcomm_accept_unix_sock(client_sock);
2779 if (sock < 0) {
273ea72c 2780 goto error;
273ea72c
DG
2781 }
2782
5eb91c98
DG
2783 /* Allocate context command to process the client request */
2784 cmd_ctx = malloc(sizeof(struct command_ctx));
2785 if (cmd_ctx == NULL) {
2786 perror("malloc cmd_ctx");
1d4b027a 2787 goto error;
5eb91c98 2788 }
1d4b027a 2789
5eb91c98
DG
2790 /* Allocate data buffer for reception */
2791 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
2792 if (cmd_ctx->lsm == NULL) {
2793 perror("malloc cmd_ctx->lsm");
2794 goto error;
2795 }
1d4b027a 2796
5eb91c98
DG
2797 cmd_ctx->llm = NULL;
2798 cmd_ctx->session = NULL;
1d4b027a 2799
5eb91c98
DG
2800 /*
2801 * Data is received from the lttng client. The struct
2802 * lttcomm_session_msg (lsm) contains the command and data request of
2803 * the client.
2804 */
2805 DBG("Receiving data from client ...");
2806 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
2807 sizeof(struct lttcomm_session_msg));
2808 if (ret <= 0) {
2809 DBG("Nothing recv() from client... continuing");
2810 close(sock);
2811 free(cmd_ctx);
2812 continue;
2813 }
1d4b027a 2814
5eb91c98
DG
2815 // TODO: Validate cmd_ctx including sanity check for
2816 // security purpose.
f7776ea7 2817
5eb91c98
DG
2818 /*
2819 * This function dispatch the work to the kernel or userspace tracer
2820 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2821 * informations for the client. The command context struct contains
2822 * everything this function may needs.
2823 */
2824 ret = process_client_msg(cmd_ctx);
2825 if (ret < 0) {
bbd973c2 2826 /*
5eb91c98
DG
2827 * TODO: Inform client somehow of the fatal error. At
2828 * this point, ret < 0 means that a malloc failed
2829 * (ENOMEM). Error detected but still accept command.
bbd973c2 2830 */
bbd973c2 2831 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
2832 continue;
2833 }
d6e4fca4 2834
54d01ffb
DG
2835 DBG("Sending response (size: %d, retcode: %s)",
2836 cmd_ctx->lttng_msg_size,
532d79a7 2837 lttng_get_readable_code(-cmd_ctx->llm->ret_code));
54d01ffb 2838 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
2839 if (ret < 0) {
2840 ERR("Failed to send data back to client");
bbd973c2 2841 }
1d4b027a 2842
5eb91c98
DG
2843 clean_command_ctx(&cmd_ctx);
2844
2845 /* End of transmission */
273ea72c
DG
2846 close(sock);
2847 }
2848
5eb91c98
DG
2849error:
2850 DBG("Client thread dying");
273ea72c 2851 unlink(client_unix_sock_path);
5eb91c98
DG
2852 close(client_sock);
2853 close(sock);
273ea72c 2854
5eb91c98 2855 lttng_poll_clean(&events);
a2fb29a5 2856 clean_command_ctx(&cmd_ctx);
1d4b027a
DG
2857 return NULL;
2858}
2859
2860
fac6795d
DG
2861/*
2862 * usage function on stderr
2863 */
2864static void usage(void)
2865{
b716ce68 2866 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
2867 fprintf(stderr, " -h, --help Display this usage.\n");
2868 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
2869 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2870 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2871 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2872 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
2873 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2874 fprintf(stderr, " -V, --version Show version number.\n");
2875 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2876 fprintf(stderr, " -q, --quiet No output at all.\n");
2877 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
31f73cc9 2878 fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
fac6795d
DG
2879}
2880
2881/*
2882 * daemon argument parsing
2883 */
2884static int parse_args(int argc, char **argv)
2885{
2886 int c;
2887
2888 static struct option long_options[] = {
2889 { "client-sock", 1, 0, 'c' },
2890 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
2891 { "kconsumerd-cmd-sock", 1, 0, 0 },
2892 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 2893 { "daemonize", 0, 0, 'd' },
5b8719f5 2894 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
2895 { "help", 0, 0, 'h' },
2896 { "group", 1, 0, 'g' },
2897 { "version", 0, 0, 'V' },
75462a81 2898 { "quiet", 0, 0, 'q' },
3f9947db 2899 { "verbose", 0, 0, 'v' },
31f73cc9 2900 { "verbose-kconsumerd", 0, 0, 'Z' },
fac6795d
DG
2901 { NULL, 0, 0, 0 }
2902 };
2903
2904 while (1) {
2905 int option_index = 0;
54d01ffb
DG
2906 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z",
2907 long_options, &option_index);
fac6795d
DG
2908 if (c == -1) {
2909 break;
2910 }
2911
2912 switch (c) {
2913 case 0:
2914 fprintf(stderr, "option %s", long_options[option_index].name);
2915 if (optarg) {
2916 fprintf(stderr, " with arg %s\n", optarg);
2917 }
2918 break;
b716ce68 2919 case 'c':
fac6795d
DG
2920 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
2921 break;
2922 case 'a':
2923 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
2924 break;
2925 case 'd':
2926 opt_daemon = 1;
2927 break;
2928 case 'g':
2929 opt_tracing_group = strdup(optarg);
2930 break;
2931 case 'h':
2932 usage();
2933 exit(EXIT_FAILURE);
2934 case 'V':
2935 fprintf(stdout, "%s\n", VERSION);
2936 exit(EXIT_SUCCESS);
5b8719f5
DG
2937 case 'S':
2938 opt_sig_parent = 1;
2939 break;
d6f42150
DG
2940 case 'E':
2941 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
2942 break;
2943 case 'C':
2944 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
2945 break;
75462a81
DG
2946 case 'q':
2947 opt_quiet = 1;
2948 break;
3f9947db 2949 case 'v':
53086306
DG
2950 /* Verbose level can increase using multiple -v */
2951 opt_verbose += 1;
3f9947db 2952 break;
31f73cc9
MD
2953 case 'Z':
2954 opt_verbose_kconsumerd += 1;
2955 break;
fac6795d
DG
2956 default:
2957 /* Unknown option or other error.
2958 * Error is printed by getopt, just return */
2959 return -1;
2960 }
2961 }
2962
2963 return 0;
2964}
2965
2966/*
d063d709 2967 * Creates the two needed socket by the daemon.
d6f42150
DG
2968 * apps_sock - The communication socket for all UST apps.
2969 * client_sock - The communication of the cli tool (lttng).
fac6795d 2970 */
cf3af59e 2971static int init_daemon_socket(void)
fac6795d
DG
2972{
2973 int ret = 0;
2974 mode_t old_umask;
2975
2976 old_umask = umask(0);
2977
2978 /* Create client tool unix socket */
d6f42150
DG
2979 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
2980 if (client_sock < 0) {
2981 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
2982 ret = -1;
2983 goto end;
2984 }
2985
2986 /* File permission MUST be 660 */
2987 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2988 if (ret < 0) {
d6f42150 2989 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
2990 perror("chmod");
2991 goto end;
2992 }
2993
2994 /* Create the application unix socket */
d6f42150
DG
2995 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
2996 if (apps_sock < 0) {
2997 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
2998 ret = -1;
2999 goto end;
3000 }
3001
d6f42150 3002 /* File permission MUST be 666 */
54d01ffb
DG
3003 ret = chmod(apps_unix_sock_path,
3004 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3005 if (ret < 0) {
d6f42150 3006 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
3007 perror("chmod");
3008 goto end;
3009 }
3010
3011end:
3012 umask(old_umask);
3013 return ret;
3014}
3015
3016/*
54d01ffb
DG
3017 * Check if the global socket is available, and if a daemon is answering at the
3018 * other side. If yes, error is returned.
fac6795d 3019 */
cf3af59e 3020static int check_existing_daemon(void)
fac6795d 3021{
7d8234d9 3022 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3023 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3024 return 0;
099e26bd 3025 }
54d01ffb 3026
7d8234d9 3027 /* Is there anybody out there ? */
099e26bd 3028 if (lttng_session_daemon_alive()) {
7d8234d9 3029 return -EEXIST;
099e26bd 3030 } else {
7d8234d9 3031 return 0;
099e26bd 3032 }
fac6795d
DG
3033}
3034
fac6795d 3035/*
d063d709 3036 * Set the tracing group gid onto the client socket.
5e16da05 3037 *
d063d709
DG
3038 * Race window between mkdir and chown is OK because we are going from more
3039 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3040 */
d6f42150 3041static int set_permissions(void)
fac6795d
DG
3042{
3043 int ret;
996b65c8 3044 gid_t gid;
fac6795d 3045
996b65c8
MD
3046 gid = allowed_group();
3047 if (gid < 0) {
a463f419
DG
3048 if (is_root) {
3049 WARN("No tracing group detected");
3050 ret = 0;
3051 } else {
3052 ERR("Missing tracing group. Aborting execution.");
3053 ret = -1;
3054 }
fac6795d
DG
3055 goto end;
3056 }
3057
d6f42150 3058 /* Set lttng run dir */
996b65c8 3059 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG
3060 if (ret < 0) {
3061 ERR("Unable to set group on " LTTNG_RUNDIR);
3062 perror("chown");
3063 }
3064
3065 /* lttng client socket path */
996b65c8 3066 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3067 if (ret < 0) {
d6f42150
DG
3068 ERR("Unable to set group on %s", client_unix_sock_path);
3069 perror("chown");
3070 }
3071
3072 /* kconsumerd error socket path */
996b65c8 3073 ret = chown(kconsumerd_err_unix_sock_path, 0, gid);
d6f42150
DG
3074 if (ret < 0) {
3075 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
3076 perror("chown");
3077 }
3078
d6f42150 3079 DBG("All permissions are set");
e07ae692 3080
fac6795d
DG
3081end:
3082 return ret;
3083}
3084
7a485870 3085/*
d063d709 3086 * Create the pipe used to wake up the kernel thread.
7a485870
DG
3087 */
3088static int create_kernel_poll_pipe(void)
3089{
3090 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3091}
3092
099e26bd
DG
3093/*
3094 * Create the application command pipe to wake thread_manage_apps.
3095 */
3096static int create_apps_cmd_pipe(void)
3097{
3098 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3099}
3100
d6f42150 3101/*
d063d709 3102 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG
3103 */
3104static int create_lttng_rundir(void)
3105{
3106 int ret;
3107
3108 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
3109 if (ret < 0) {
b1f11e69
DG
3110 if (errno != EEXIST) {
3111 ERR("Unable to create " LTTNG_RUNDIR);
3112 goto error;
3113 } else {
3114 ret = 0;
3115 }
d6f42150
DG
3116 }
3117
3118error:
3119 return ret;
3120}
3121
3122/*
d063d709
DG
3123 * Setup sockets and directory needed by the kconsumerd communication with the
3124 * session daemon.
d6f42150
DG
3125 */
3126static int set_kconsumerd_sockets(void)
3127{
3128 int ret;
3129
3130 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
54d01ffb
DG
3131 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX,
3132 KCONSUMERD_ERR_SOCK_PATH);
d6f42150
DG
3133 }
3134
3135 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
54d01ffb
DG
3136 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX,
3137 KCONSUMERD_CMD_SOCK_PATH);
d6f42150
DG
3138 }
3139
3140 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
3141 if (ret < 0) {
6beb2242
DG
3142 if (errno != EEXIST) {
3143 ERR("Failed to create " KCONSUMERD_PATH);
3144 goto error;
3145 }
3146 ret = 0;
d6f42150
DG
3147 }
3148
3149 /* Create the kconsumerd error unix socket */
54d01ffb
DG
3150 kconsumerd_err_sock =
3151 lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
d6f42150
DG
3152 if (kconsumerd_err_sock < 0) {
3153 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
3154 ret = -1;
3155 goto error;
3156 }
3157
3158 /* File permission MUST be 660 */
54d01ffb
DG
3159 ret = chmod(kconsumerd_err_unix_sock_path,
3160 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150
DG
3161 if (ret < 0) {
3162 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
3163 perror("chmod");
3164 goto error;
3165 }
3166
3167error:
3168 return ret;
3169}
3170
fac6795d 3171/*
d063d709 3172 * Signal handler for the daemon
cf3af59e 3173 *
54d01ffb
DG
3174 * Simply stop all worker threads, leaving main() return gracefully after
3175 * joining all threads and calling cleanup().
fac6795d
DG
3176 */
3177static void sighandler(int sig)
3178{
3179 switch (sig) {
cf3af59e
MD
3180 case SIGPIPE:
3181 DBG("SIGPIPE catched");
3182 return;
3183 case SIGINT:
3184 DBG("SIGINT catched");
3185 stop_threads();
3186 break;
3187 case SIGTERM:
3188 DBG("SIGTERM catched");
3189 stop_threads();
3190 break;
3191 default:
3192 break;
fac6795d 3193 }
fac6795d
DG
3194}
3195
3196/*
d063d709 3197 * Setup signal handler for :
1d4b027a 3198 * SIGINT, SIGTERM, SIGPIPE
fac6795d 3199 */
1d4b027a 3200static int set_signal_handler(void)
fac6795d 3201{
1d4b027a
DG
3202 int ret = 0;
3203 struct sigaction sa;
3204 sigset_t sigset;
fac6795d 3205
1d4b027a
DG
3206 if ((ret = sigemptyset(&sigset)) < 0) {
3207 perror("sigemptyset");
3208 return ret;
3209 }
d6f42150 3210
1d4b027a
DG
3211 sa.sa_handler = sighandler;
3212 sa.sa_mask = sigset;
3213 sa.sa_flags = 0;
3214 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
3215 perror("sigaction");
3216 return ret;
d6f42150
DG
3217 }
3218
1d4b027a
DG
3219 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
3220 perror("sigaction");
3221 return ret;
d6f42150 3222 }
aaf26714 3223
1d4b027a
DG
3224 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3225 perror("sigaction");
3226 return ret;
8c0faa1d
DG
3227 }
3228
1d4b027a
DG
3229 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3230
3231 return ret;
fac6795d
DG
3232}
3233
f3ed775e 3234/*
d063d709
DG
3235 * Set open files limit to unlimited. This daemon can open a large number of
3236 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
3237 */
3238static void set_ulimit(void)
3239{
3240 int ret;
3241 struct rlimit lim;
3242
a88df331 3243 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
3244 lim.rlim_cur = 65535;
3245 lim.rlim_max = 65535;
3246
3247 ret = setrlimit(RLIMIT_NOFILE, &lim);
3248 if (ret < 0) {
3249 perror("failed to set open files limit");
3250 }
3251}
3252
fac6795d
DG
3253/*
3254 * main
3255 */
3256int main(int argc, char **argv)
3257{
fac6795d
DG
3258 int ret = 0;
3259 void *status;
b082db07 3260 const char *home_path;
fac6795d 3261
273ea72c 3262 /* Create thread quit pipe */
cf3af59e
MD
3263 if ((ret = init_thread_quit_pipe()) < 0) {
3264 goto error;
273ea72c
DG
3265 }
3266
fac6795d
DG
3267 /* Parse arguments */
3268 progname = argv[0];
3269 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 3270 goto error;
fac6795d
DG
3271 }
3272
3273 /* Daemonize */
3274 if (opt_daemon) {
53094c05
DG
3275 ret = daemon(0, 0);
3276 if (ret < 0) {
3277 perror("daemon");
cf3af59e 3278 goto error;
53094c05 3279 }
fac6795d
DG
3280 }
3281
3282 /* Check if daemon is UID = 0 */
3283 is_root = !getuid();
3284
fac6795d 3285 if (is_root) {
d6f42150
DG
3286 ret = create_lttng_rundir();
3287 if (ret < 0) {
cf3af59e 3288 goto error;
d6f42150
DG
3289 }
3290
fac6795d 3291 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
3292 snprintf(apps_unix_sock_path, PATH_MAX,
3293 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
3294 }
3295
3296 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
3297 snprintf(client_unix_sock_path, PATH_MAX,
3298 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
3299 }
0fdd1e2c
DG
3300
3301 /* Set global SHM for ust */
3302 if (strlen(wait_shm_path) == 0) {
3303 snprintf(wait_shm_path, PATH_MAX,
3304 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
3305 }
fac6795d 3306 } else {
b082db07
DG
3307 home_path = get_home_dir();
3308 if (home_path == NULL) {
273ea72c
DG
3309 /* TODO: Add --socket PATH option */
3310 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD
3311 ret = -EPERM;
3312 goto error;
b082db07
DG
3313 }
3314
fac6795d 3315 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 3316 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 3317 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
3318 }
3319
3320 /* Set the cli tool unix socket path */
3321 if (strlen(client_unix_sock_path) == 0) {
d6f42150 3322 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 3323 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 3324 }
0fdd1e2c
DG
3325
3326 /* Set global SHM for ust */
3327 if (strlen(wait_shm_path) == 0) {
3328 snprintf(wait_shm_path, PATH_MAX,
3329 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
3330 }
fac6795d
DG
3331 }
3332
847177cd
DG
3333 DBG("Client socket path %s", client_unix_sock_path);
3334 DBG("Application socket path %s", apps_unix_sock_path);
3335
273ea72c 3336 /*
7d8234d9 3337 * See if daemon already exist.
fac6795d 3338 */
7d8234d9 3339 if ((ret = check_existing_daemon()) < 0) {
75462a81 3340 ERR("Already running daemon.\n");
273ea72c 3341 /*
cf3af59e
MD
3342 * We do not goto exit because we must not cleanup()
3343 * because a daemon is already running.
ab118b20 3344 */
cf3af59e 3345 goto error;
a88df331
DG
3346 }
3347
54d01ffb 3348 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG
3349
3350 /*
3351 * These actions must be executed as root. We do that *after* setting up
3352 * the sockets path because we MUST make the check for another daemon using
3353 * those paths *before* trying to set the kernel consumer sockets and init
3354 * kernel tracer.
3355 */
3356 if (is_root) {
3357 ret = set_kconsumerd_sockets();
3358 if (ret < 0) {
cf3af59e 3359 goto exit;
a88df331
DG
3360 }
3361
3362 /* Setup kernel tracer */
3363 init_kernel_tracer();
3364
3365 /* Set ulimit for open files */
3366 set_ulimit();
fac6795d
DG
3367 }
3368
cf3af59e
MD
3369 if ((ret = set_signal_handler()) < 0) {
3370 goto exit;
fac6795d
DG
3371 }
3372
d6f42150 3373 /* Setup the needed unix socket */
cf3af59e
MD
3374 if ((ret = init_daemon_socket()) < 0) {
3375 goto exit;
fac6795d
DG
3376 }
3377
3378 /* Set credentials to socket */
cf3af59e
MD
3379 if (is_root && ((ret = set_permissions()) < 0)) {
3380 goto exit;
fac6795d
DG
3381 }
3382
5b8719f5
DG
3383 /* Get parent pid if -S, --sig-parent is specified. */
3384 if (opt_sig_parent) {
3385 ppid = getppid();
3386 }
3387
7a485870 3388 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD
3389 if ((ret = create_kernel_poll_pipe()) < 0) {
3390 goto exit;
7a485870
DG
3391 }
3392
099e26bd
DG
3393 /* Setup the thread apps communication pipe. */
3394 if ((ret = create_apps_cmd_pipe()) < 0) {
3395 goto exit;
3396 }
3397
3398 /* Init UST command queue. */
3399 cds_wfq_init(&ust_cmd_queue.queue);
3400
273ea72c 3401 /*
54d01ffb
DG
3402 * Get session list pointer. This pointer MUST NOT be free(). This list is
3403 * statically declared in session.c
273ea72c 3404 */
54d01ffb 3405 session_list_ptr = session_get_list();
b5541356 3406
5eb91c98
DG
3407 /* Set up max poll set size */
3408 lttng_poll_set_max_size();
3409
cf3af59e 3410 /* Create thread to manage the client socket */
099e26bd
DG
3411 ret = pthread_create(&client_thread, NULL,
3412 thread_manage_clients, (void *) NULL);
cf3af59e 3413 if (ret != 0) {
099e26bd 3414 perror("pthread_create clients");
cf3af59e
MD
3415 goto exit_client;
3416 }
fac6795d 3417
099e26bd
DG
3418 /* Create thread to dispatch registration */
3419 ret = pthread_create(&dispatch_thread, NULL,
3420 thread_dispatch_ust_registration, (void *) NULL);
3421 if (ret != 0) {
3422 perror("pthread_create dispatch");
3423 goto exit_dispatch;
3424 }
3425
3426 /* Create thread to manage application registration. */
3427 ret = pthread_create(&reg_apps_thread, NULL,
3428 thread_registration_apps, (void *) NULL);
3429 if (ret != 0) {
3430 perror("pthread_create registration");
3431 goto exit_reg_apps;
3432 }
3433
cf3af59e 3434 /* Create thread to manage application socket */
54d01ffb
DG
3435 ret = pthread_create(&apps_thread, NULL,
3436 thread_manage_apps, (void *) NULL);
cf3af59e 3437 if (ret != 0) {
099e26bd 3438 perror("pthread_create apps");
cf3af59e
MD
3439 goto exit_apps;
3440 }
fac6795d 3441
cf3af59e 3442 /* Create kernel thread to manage kernel event */
54d01ffb
DG
3443 ret = pthread_create(&kernel_thread, NULL,
3444 thread_manage_kernel, (void *) NULL);
cf3af59e 3445 if (ret != 0) {
099e26bd