Update quickstart, describing syscall events
[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
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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
DG
142/*
143 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
144 */
145static int create_thread_poll_set(struct lttng_poll_event *events,
146 unsigned int size)
147{
148 int ret;
149
150 if (events == NULL || size == 0) {
151 ret = -1;
152 goto error;
153 }
154
155 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
156 if (ret < 0) {
157 goto error;
158 }
159
160 /* Add quit pipe */
161 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
162 if (ret < 0) {
163 goto error;
164 }
165
166 return 0;
167
168error:
169 return ret;
170}
171
172/*
173 * Check if the thread quit pipe was triggered.
174 *
175 * Return 1 if it was triggered else 0;
176 */
177static int check_thread_quit_pipe(int fd, uint32_t events)
178{
179 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
180 return 1;
181 }
182
183 return 0;
184}
185
0fdd1e2c
DG
186/*
187 * Remove modules in reverse load order.
188 */
189static int modprobe_remove_kernel_modules(void)
190{
191 int ret = 0, i;
192 char modprobe[256];
193
194 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
195 ret = snprintf(modprobe, sizeof(modprobe),
196 "/sbin/modprobe --remove --quiet %s",
197 kernel_modules_list[i].name);
198 if (ret < 0) {
199 perror("snprintf modprobe --remove");
200 goto error;
201 }
202 modprobe[sizeof(modprobe) - 1] = '\0';
203 ret = system(modprobe);
204 if (ret == -1) {
205 ERR("Unable to launch modprobe --remove for module %s",
206 kernel_modules_list[i].name);
207 } else if (kernel_modules_list[i].required
208 && WEXITSTATUS(ret) != 0) {
209 ERR("Unable to remove module %s",
210 kernel_modules_list[i].name);
211 } else {
212 DBG("Modprobe removal successful %s",
213 kernel_modules_list[i].name);
214 }
215 }
216
217error:
218 return ret;
219}
220
221/*
222 * Return group ID of the tracing group or -1 if not found.
223 */
996b65c8
MD
224static gid_t allowed_group(void)
225{
226 struct group *grp;
227
274e143b
MD
228 if (opt_tracing_group) {
229 grp = getgrnam(opt_tracing_group);
230 } else {
231 grp = getgrnam(default_tracing_group);
232 }
996b65c8
MD
233 if (!grp) {
234 return -1;
235 } else {
236 return grp->gr_gid;
237 }
238}
239
273ea72c 240/*
5eb91c98 241 * Init thread quit pipe.
273ea72c
DG
242 *
243 * Return -1 on error or 0 if all pipes are created.
244 */
245static int init_thread_quit_pipe(void)
246{
247 int ret;
248
249 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
250 if (ret < 0) {
251 perror("thread quit pipe");
252 goto error;
253 }
254
255error:
256 return ret;
257}
258
fac6795d 259/*
d063d709
DG
260 * Complete teardown of a kernel session. This free all data structure related
261 * to a kernel session and update counter.
fac6795d 262 */
1d4b027a 263static void teardown_kernel_session(struct ltt_session *session)
fac6795d 264{
1d4b027a
DG
265 if (session->kernel_session != NULL) {
266 DBG("Tearing down kernel session");
d9800920
DG
267
268 /*
269 * If a custom kernel consumer was registered, close the socket before
270 * tearing down the complete kernel session structure
271 */
272 if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) {
273 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
274 }
275
62499ad6 276 trace_kernel_destroy_session(session->kernel_session);
1d4b027a
DG
277 /* Extra precaution */
278 session->kernel_session = NULL;
fac6795d 279 }
fac6795d
DG
280}
281
099e26bd
DG
282/*
283 * Stop all threads by closing the thread quit pipe.
284 */
cf3af59e
MD
285static void stop_threads(void)
286{
5eb91c98
DG
287 int ret;
288
cf3af59e
MD
289 /* Stopping all threads */
290 DBG("Terminating all threads");
54d01ffb 291 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
292 if (ret < 0) {
293 ERR("write error on thread quit pipe");
294 }
295
099e26bd
DG
296 /* Dispatch thread */
297 dispatch_thread_exit = 1;
298 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
299}
300
fac6795d 301/*
d063d709 302 * Cleanup the daemon
fac6795d 303 */
cf3af59e 304static void cleanup(void)
fac6795d 305{
1d4b027a
DG
306 int ret;
307 char *cmd;
af9737e9 308 struct ltt_session *sess, *stmp;
fac6795d 309
1d4b027a 310 DBG("Cleaning up");
e07ae692 311
1d4b027a 312 /* <fun> */
2f50c8a3 313 MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
273ea72c
DG
314 "Matthew, BEET driven development works!%c[%dm",
315 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
1d4b027a 316 /* </fun> */
fac6795d 317
5eb91c98
DG
318 if (is_root) {
319 DBG("Removing %s directory", LTTNG_RUNDIR);
320 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
321 if (ret < 0) {
322 ERR("asprintf failed. Something is really wrong!");
323 }
5461b305 324
5eb91c98
DG
325 /* Remove lttng run directory */
326 ret = system(cmd);
327 if (ret < 0) {
328 ERR("Unable to clean " LTTNG_RUNDIR);
329 }
1d4b027a 330 }
5461b305 331
1d4b027a 332 DBG("Cleaning up all session");
fac6795d 333
b5541356 334 /* Destroy session list mutex */
273ea72c
DG
335 if (session_list_ptr != NULL) {
336 pthread_mutex_destroy(&session_list_ptr->lock);
337
338 /* Cleanup ALL session */
54d01ffb
DG
339 cds_list_for_each_entry_safe(sess, stmp,
340 &session_list_ptr->head, list) {
273ea72c
DG
341 teardown_kernel_session(sess);
342 // TODO complete session cleanup (including UST)
343 }
344 }
345
099e26bd
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 */
44d3bd01
DG
1564static int create_ust_session(struct ltt_session *session,
1565 struct lttng_domain *domain)
0177d773 1566{
44d3bd01 1567 int ret;
0177d773 1568 struct ltt_ust_session *lus;
44d3bd01
DG
1569 struct ltt_traceable_app *app;
1570
1571 switch (domain->type) {
1572 case LTTNG_DOMAIN_UST_PID:
1573 app = traceable_app_get_by_pid(domain->attr.pid);
1574 if (app == NULL) {
1575 ret = LTTCOMM_APP_NOT_FOUND;
1576 goto error;
1577 }
1578 break;
1579 default:
1580 goto error;
1581 }
0177d773
DG
1582
1583 DBG("Creating UST session");
1584
44d3bd01 1585 lus = trace_ust_create_session(session->path, domain->attr.pid, domain);
0177d773 1586 if (lus == NULL) {
44d3bd01 1587 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1588 goto error;
1589 }
1590
1591 ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG,
1592 geteuid(), allowed_group());
1593 if (ret < 0) {
1594 if (ret != -EEXIST) {
1595 ERR("Trace directory creation error");
44d3bd01 1596 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1597 goto error;
1598 }
1599 }
1600
1601 /* Create session on the UST tracer */
44d3bd01 1602 ret = ustctl_create_session(app->sock, lus);
0177d773 1603 if (ret < 0) {
44d3bd01 1604 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1605 goto error;
1606 }
1607
44d3bd01
DG
1608 cds_list_add(&lus->list, &session->ust_session_list.head);
1609 session->ust_session_list.count++;
1610
1611 return LTTCOMM_OK;
0177d773
DG
1612
1613error:
1614 free(lus);
1615 return ret;
1616}
1617
333f285e 1618/*
d063d709 1619 * Create a kernel tracer session then create the default channel.
333f285e 1620 */
f3ed775e 1621static int create_kernel_session(struct ltt_session *session)
333f285e 1622{
f3ed775e 1623 int ret;
f3ed775e
DG
1624
1625 DBG("Creating kernel session");
1626
1627 ret = kernel_create_session(session, kernel_tracer_fd);
1628 if (ret < 0) {
1629 ret = LTTCOMM_KERN_SESS_FAIL;
1630 goto error;
333f285e
DG
1631 }
1632
d9800920
DG
1633 /* Set kernel consumer socket fd */
1634 if (kconsumerd_cmd_sock) {
1635 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
1636 }
1637
63053e7c
DG
1638 ret = mkdir_recursive(session->kernel_session->trace_path,
1639 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1640 if (ret < 0) {
996b65c8 1641 if (ret != -EEXIST) {
7a485870
DG
1642 ERR("Trace directory creation error");
1643 goto error;
1644 }
1645 }
1646
f3ed775e
DG
1647error:
1648 return ret;
333f285e
DG
1649}
1650
6c9cc2ab
DG
1651/*
1652 * Using the session list, filled a lttng_session array to send back to the
1653 * client for session listing.
1654 *
1655 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1656 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1657 */
1658static void list_lttng_sessions(struct lttng_session *sessions)
1659{
1660 int i = 0;
1661 struct ltt_session *session;
1662
1663 DBG("Getting all available session");
1664 /*
1665 * Iterate over session list and append data after the control struct in
1666 * the buffer.
1667 */
1668 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1669 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1670 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1671 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1672 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1673 i++;
1674 }
1675}
1676
9f19cc17
DG
1677/*
1678 * Fill lttng_channel array of all channels.
1679 */
1680static void list_lttng_channels(struct ltt_session *session,
1681 struct lttng_channel *channels)
1682{
1683 int i = 0;
1684 struct ltt_kernel_channel *kchan;
1685
1686 DBG("Listing channels for session %s", session->name);
1687
1688 /* Kernel channels */
1689 if (session->kernel_session != NULL) {
54d01ffb
DG
1690 cds_list_for_each_entry(kchan,
1691 &session->kernel_session->channel_list.head, list) {
9f19cc17
DG
1692 /* Copy lttng_channel struct to array */
1693 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1694 channels[i].enabled = kchan->enabled;
1695 i++;
1696 }
1697 }
1698
1699 /* TODO: Missing UST listing */
1700}
1701
1702/*
1703 * Fill lttng_event array of all events in the channel.
1704 */
1705static void list_lttng_events(struct ltt_kernel_channel *kchan,
1706 struct lttng_event *events)
1707{
1708 /*
1709 * TODO: This is ONLY kernel. Need UST support.
1710 */
1711 int i = 0;
1712 struct ltt_kernel_event *event;
1713
1714 DBG("Listing events for channel %s", kchan->channel->name);
1715
1716 /* Kernel channels */
1717 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1718 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1719 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG
1720 events[i].enabled = event->enabled;
1721 switch (event->event->instrumentation) {
1722 case LTTNG_KERNEL_TRACEPOINT:
1723 events[i].type = LTTNG_EVENT_TRACEPOINT;
1724 break;
1725 case LTTNG_KERNEL_KPROBE:
1726 case LTTNG_KERNEL_KRETPROBE:
1727 events[i].type = LTTNG_EVENT_PROBE;
1728 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1729 sizeof(struct lttng_kernel_kprobe));
1730 break;
1731 case LTTNG_KERNEL_FUNCTION:
1732 events[i].type = LTTNG_EVENT_FUNCTION;
1733 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1734 sizeof(struct lttng_kernel_function));
1735 break;
0133c199
MD
1736 case LTTNG_KERNEL_NOOP:
1737 events[i].type = LTTNG_EVENT_NOOP;
1738 break;
a54bd42d
MD
1739 case LTTNG_KERNEL_SYSCALL:
1740 events[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1741 break;
9f19cc17
DG
1742 }
1743 i++;
1744 }
1745}
1746
fac6795d 1747/*
54d01ffb 1748 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1749 */
54d01ffb
DG
1750static int cmd_disable_channel(struct ltt_session *session,
1751 int domain, char *channel_name)
fac6795d 1752{
54d01ffb 1753 int ret;
379473d2 1754
54d01ffb
DG
1755 switch (domain) {
1756 case LTTNG_DOMAIN_KERNEL:
1757 ret = channel_kernel_disable(session->kernel_session,
1758 channel_name);
1759 if (ret != LTTCOMM_OK) {
333f285e
DG
1760 goto error;
1761 }
54d01ffb
DG
1762
1763 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 1764 break;
44d3bd01
DG
1765 case LTTNG_DOMAIN_UST_PID:
1766 break;
d0254c7c 1767 default:
44d3bd01 1768 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 1769 goto error;
20fe2104
DG
1770 }
1771
54d01ffb 1772 ret = LTTCOMM_OK;
d65106b1 1773
54d01ffb
DG
1774error:
1775 return ret;
1776}
1777
1778/*
1779 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1780 */
44d3bd01
DG
1781static int cmd_enable_channel(struct ltt_session *session,
1782 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG
1783{
1784 int ret;
d65106b1 1785
44d3bd01
DG
1786 switch (domain->type) {
1787 case LTTNG_DOMAIN_KERNEL:
1788 {
1789 struct ltt_kernel_channel *kchan;
54d01ffb 1790
44d3bd01
DG
1791 kchan = trace_kernel_get_channel_by_name(attr->name,
1792 session->kernel_session);
1793 if (kchan == NULL) {
1794 ret = channel_kernel_create(session->kernel_session,
1795 attr, kernel_poll_pipe[1]);
1796 } else {
1797 ret = channel_kernel_enable(session->kernel_session, kchan);
1798 }
1799
1800 if (ret != LTTCOMM_OK) {
1801 goto error;
1802 }
1803
1804 kernel_wait_quiescent(kernel_tracer_fd);
1805 break;
1806 }
1807 case LTTNG_DOMAIN_UST_PID:
1808 {
1809 struct ltt_ust_event *uevent, *new_uevent;
1810 struct ltt_ust_session *usess;
1811 struct ltt_ust_channel *uchan, *app_chan;
1812 struct ltt_traceable_app *app;
1813
1814 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
1815 domain->attr.pid);
1816 if (usess == NULL) {
1817 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
1818 goto error;
1819 }
1820
1821 app = traceable_app_get_by_pid(domain->attr.pid);
1822 if (app == NULL) {
1823 ret = LTTCOMM_APP_NOT_FOUND;
1824 goto error;
1825 }
1826
1827 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1828 if (uchan == NULL) {
1829 ret = channel_ust_create(usess, attr, app->sock);
1830 } else {
1831 ret = channel_ust_enable(usess, uchan, app->sock);
1832 }
1833
1834 if (ret != LTTCOMM_OK) {
1835 goto error;
1836 }
1837
1838 /*TODO: This should be put in an external function */
1839
1840 /* Copy UST channel to add to the traceable app */
1841 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1842 if (uchan == NULL) {
1843 ret = LTTCOMM_FATAL;
1844 goto error;
1845 }
1846
1847 app_chan = trace_ust_create_channel(attr, session->path);
1848 if (app_chan == NULL) {
1849 PERROR("malloc ltt_ust_channel");
1850 ret = LTTCOMM_FATAL;
1851 goto error;
1852 }
1853
1854 memcpy(app_chan, uchan, sizeof(struct ltt_ust_channel));
1855 CDS_INIT_LIST_HEAD(&app_chan->events.head);
1856
1857 cds_list_for_each_entry(uevent, &uchan->events.head, list) {
1858 new_uevent = malloc(sizeof(struct ltt_ust_event));
1859 if (new_uevent == NULL) {
1860 PERROR("malloc ltt_ust_event");
1861 ret = LTTCOMM_FATAL;
d65106b1
DG
1862 goto error;
1863 }
54d01ffb 1864
44d3bd01
DG
1865 memcpy(new_uevent, uevent, sizeof(struct ltt_ust_event));
1866 cds_list_add(&new_uevent->list, &app_chan->events.head);
1867 app_chan->events.count++;
1868 }
1869
1870 /* Add channel to traceable_app */
1871 cds_list_add(&app_chan->list, &app->channels.head);
1872 app->channels.count++;
1873
1874 DBG("UST channel %s created for app sock %d with pid %d",
1875 attr->name, app->sock, domain->attr.pid);
1876 break;
1877 }
1878 default:
1879 ret = LTTCOMM_UNKNOWN_DOMAIN;
1880 goto error;
54d01ffb
DG
1881 }
1882
1883 ret = LTTCOMM_OK;
1884
1885error:
1886 return ret;
1887}
1888
1889/*
1890 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1891 */
1892static int cmd_disable_event(struct ltt_session *session, int domain,
1893 char *channel_name, char *event_name)
1894{
1895 int ret;
1896 struct ltt_kernel_channel *kchan;
1897
1898 switch (domain) {
1899 case LTTNG_DOMAIN_KERNEL:
1900 kchan = trace_kernel_get_channel_by_name(channel_name,
1901 session->kernel_session);
1902 if (kchan == NULL) {
1903 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1904 goto error;
d65106b1
DG
1905 }
1906
54d01ffb
DG
1907 ret = event_kernel_disable(session->kernel_session, kchan, event_name);
1908 if (ret != LTTCOMM_OK) {
1909 goto error;
1910 }
1911
1912 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 1913 break;
54d01ffb
DG
1914 default:
1915 /* TODO: Userspace tracing */
1916 ret = LTTCOMM_NOT_IMPLEMENTED;
1917 goto error;
d65106b1 1918 }
26cc6b4e 1919
54d01ffb
DG
1920 ret = LTTCOMM_OK;
1921
1922error:
1923 return ret;
1924}
1925
1926/*
1927 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1928 */
1929static int cmd_disable_event_all(struct ltt_session *session, int domain,
1930 char *channel_name)
1931{
1932 int ret;
1933 struct ltt_kernel_channel *kchan;
1934
1935 switch (domain) {
1936 case LTTNG_DOMAIN_KERNEL:
1937 kchan = trace_kernel_get_channel_by_name(channel_name,
1938 session->kernel_session);
1939 if (kchan == NULL) {
1940 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1941 goto error;
26cc6b4e
DG
1942 }
1943
54d01ffb
DG
1944 ret = event_kernel_disable_all(session->kernel_session, kchan);
1945 if (ret != LTTCOMM_OK) {
0b97ec54 1946 goto error;
26cc6b4e
DG
1947 }
1948
54d01ffb 1949 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 1950 break;
54d01ffb
DG
1951 default:
1952 /* TODO: Userspace tracing */
1953 ret = LTTCOMM_NOT_IMPLEMENTED;
1954 goto error;
26cc6b4e 1955 }
e953ef25 1956
54d01ffb 1957 ret = LTTCOMM_OK;
e953ef25 1958
54d01ffb
DG
1959error:
1960 return ret;
1961}
f5177a38 1962
54d01ffb
DG
1963/*
1964 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1965 */
1966static int cmd_add_context(struct ltt_session *session, int domain,
1967 char *channel_name, char *event_name, struct lttng_event_context *ctx)
1968{
1969 int ret;
f5177a38 1970
54d01ffb
DG
1971 switch (domain) {
1972 case LTTNG_DOMAIN_KERNEL:
1973 /* Add kernel context to kernel tracer */
1974 ret = context_kernel_add(session->kernel_session, ctx,
1975 event_name, channel_name);
1976 if (ret != LTTCOMM_OK) {
f5177a38 1977 goto error;
e953ef25
DG
1978 }
1979
e953ef25 1980 break;
54d01ffb
DG
1981 default:
1982 /* TODO: Userspace tracing */
1983 ret = LTTCOMM_NOT_IMPLEMENTED;
1984 goto error;
e953ef25 1985 }
950131af 1986
54d01ffb 1987 ret = LTTCOMM_OK;
950131af 1988
54d01ffb
DG
1989error:
1990 return ret;
1991}
1992
1993/*
1994 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1995 */
1996static int cmd_enable_event(struct ltt_session *session, int domain,
1997 char *channel_name, struct lttng_event *event)
1998{
1999 int ret;
2000 struct ltt_kernel_channel *kchan;
2001
2002 switch (domain) {
2003 case LTTNG_DOMAIN_KERNEL:
2004 kchan = trace_kernel_get_channel_by_name(channel_name,
2005 session->kernel_session);
2006 if (kchan == NULL) {
2007 /* This call will notify the kernel thread */
44d3bd01 2008 ret = channel_kernel_create(session->kernel_session,
54d01ffb
DG
2009 NULL, kernel_poll_pipe[1]);
2010 if (ret != LTTCOMM_OK) {
f5177a38
DG
2011 goto error;
2012 }
54d01ffb 2013 }
950131af 2014
54d01ffb
DG
2015 /* Get the newly created kernel channel pointer */
2016 kchan = trace_kernel_get_channel_by_name(channel_name,
2017 session->kernel_session);
2018 if (kchan == NULL) {
2019 /* This sould not happen... */
2020 ret = LTTCOMM_FATAL;
2021 goto error;
2022 }
f5177a38 2023
54d01ffb
DG
2024 ret = event_kernel_enable(session->kernel_session, kchan, event);
2025 if (ret != LTTCOMM_OK) {
f5177a38 2026 goto error;
950131af
DG
2027 }
2028
54d01ffb 2029 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2030 break;
54d01ffb
DG
2031 default:
2032 /* TODO: Userspace tracing */
2033 ret = LTTCOMM_NOT_IMPLEMENTED;
2034 goto error;
950131af 2035 }
d36b8583 2036
54d01ffb 2037 ret = LTTCOMM_OK;
d36b8583 2038
54d01ffb
DG
2039error:
2040 return ret;
2041}
7d29a247 2042
54d01ffb
DG
2043/*
2044 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2045 */
2046static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2047 char *channel_name, int event_type)
54d01ffb
DG
2048{
2049 int ret;
2050 struct ltt_kernel_channel *kchan;
7d29a247 2051
54d01ffb
DG
2052 switch (domain) {
2053 case LTTNG_DOMAIN_KERNEL:
2054 kchan = trace_kernel_get_channel_by_name(channel_name,
2055 session->kernel_session);
2056 if (kchan == NULL) {
2057 /* This call will notify the kernel thread */
44d3bd01
DG
2058 ret = channel_kernel_create(session->kernel_session, NULL,
2059 kernel_poll_pipe[1]);
54d01ffb
DG
2060 if (ret != LTTCOMM_OK) {
2061 goto error;
d36b8583 2062 }
54d01ffb 2063 }
0d0c377a 2064
54d01ffb
DG
2065 /* Get the newly created kernel channel pointer */
2066 kchan = trace_kernel_get_channel_by_name(channel_name,
2067 session->kernel_session);
2068 if (kchan == NULL) {
2069 /* This sould not happen... */
2070 ret = LTTCOMM_FATAL;
2071 goto error;
2072 }
0fdd1e2c 2073
8c9ae521
DG
2074 if (event_type == LTTNG_KERNEL_SYSCALL) {
2075 ret = event_kernel_enable_syscalls(session->kernel_session,
2076 kchan, kernel_tracer_fd);
2077 } else {
2078 /*
2079 * This call enables all LTTNG_KERNEL_TRACEPOINTS and events
2080 * already registered to the channel.
2081 */
2082 ret = event_kernel_enable_all(session->kernel_session,
2083 kchan, kernel_tracer_fd);
2084 }
2085
54d01ffb 2086 if (ret != LTTCOMM_OK) {
0d0c377a 2087 goto error;
d36b8583
DG
2088 }
2089
54d01ffb 2090 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2091 break;
54d01ffb
DG
2092 default:
2093 /* TODO: Userspace tracing */
2094 ret = LTTCOMM_NOT_IMPLEMENTED;
2095 goto error;
d36b8583 2096 }
f3ed775e 2097
54d01ffb
DG
2098 ret = LTTCOMM_OK;
2099
2100error:
2101 return ret;
2102}
2103
2104/*
2105 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2106 */
2107static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2108{
2109 int ret;
2110 ssize_t nb_events = 0;
2111
2112 switch (domain) {
2113 case LTTNG_DOMAIN_KERNEL:
2114 nb_events = kernel_list_events(kernel_tracer_fd, events);
2115 if (nb_events < 0) {
2116 ret = LTTCOMM_KERN_LIST_FAIL;
2117 goto error;
894be886 2118 }
54d01ffb
DG
2119 break;
2120 default:
2121 /* TODO: Userspace listing */
2122 ret = LTTCOMM_NOT_IMPLEMENTED;
2123 goto error;
2124 }
894be886 2125
54d01ffb 2126 return nb_events;
7d29a247 2127
54d01ffb
DG
2128error:
2129 /* Return negative value to differentiate return code */
2130 return -ret;
2131}
b389abbe 2132
54d01ffb
DG
2133/*
2134 * Command LTTNG_START_TRACE processed by the client thread.
2135 */
2136static int cmd_start_trace(struct ltt_session *session)
2137{
2138 int ret;
2139 struct ltt_kernel_channel *kchan;
2140 struct ltt_kernel_session *ksession;
b389abbe 2141
54d01ffb
DG
2142 /* Short cut */
2143 ksession = session->kernel_session;
5eb91c98 2144
54d01ffb
DG
2145 /* Kernel tracing */
2146 if (ksession != NULL) {
2147 /* Open kernel metadata */
2148 if (ksession->metadata == NULL) {
2149 ret = kernel_open_metadata(ksession, ksession->trace_path);
2150 if (ret < 0) {
2151 ret = LTTCOMM_KERN_META_FAIL;
2152 goto error;
b389abbe 2153 }
54d01ffb 2154 }
7d29a247 2155
54d01ffb
DG
2156 /* Open kernel metadata stream */
2157 if (ksession->metadata_stream_fd == 0) {
2158 ret = kernel_open_metadata_stream(ksession);
2159 if (ret < 0) {
2160 ERR("Kernel create metadata stream failed");
2161 ret = LTTCOMM_KERN_STREAM_FAIL;
2162 goto error;
2163 }
2164 }
2165
2166 /* For each channel */
2167 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2168 if (kchan->stream_count == 0) {
2169 ret = kernel_open_channel_stream(kchan);
2170 if (ret < 0) {
2171 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2172 goto error;
2173 }
54d01ffb
DG
2174 /* Update the stream global counter */
2175 ksession->stream_count_global += ret;
7d29a247 2176 }
54d01ffb
DG
2177 }
2178
2179 /* Setup kernel consumer socket and send fds to it */
2180 ret = init_kernel_tracing(ksession);
2181 if (ret < 0) {
2182 ret = LTTCOMM_KERN_START_FAIL;
2183 goto error;
2184 }
2185
2186 /* This start the kernel tracing */
2187 ret = kernel_start_session(ksession);
2188 if (ret < 0) {
2189 ret = LTTCOMM_KERN_START_FAIL;
2190 goto error;
2191 }
2192
2193 /* Quiescent wait after starting trace */
2194 kernel_wait_quiescent(kernel_tracer_fd);
2195 }
2196
2197 /* TODO: Start all UST traces */
2198
2199 ret = LTTCOMM_OK;
2200
2201error:
2202 return ret;
2203}
2204
2205/*
2206 * Command LTTNG_STOP_TRACE processed by the client thread.
2207 */
2208static int cmd_stop_trace(struct ltt_session *session)
2209{
2210 int ret;
2211 struct ltt_kernel_channel *kchan;
2212 struct ltt_kernel_session *ksession;
2213
2214 /* Short cut */
2215 ksession = session->kernel_session;
2216
2217 /* Kernel tracer */
2218 if (ksession != NULL) {
2219 DBG("Stop kernel tracing");
2220
2221 /* Flush all buffers before stopping */
2222 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2223 if (ret < 0) {
2224 ERR("Kernel metadata flush failed");
2225 }
f34daff7 2226
54d01ffb
DG
2227 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2228 ret = kernel_flush_buffer(kchan);
0d0c377a 2229 if (ret < 0) {
54d01ffb 2230 ERR("Kernel flush buffer error");
7d29a247 2231 }
54d01ffb 2232 }
19e70852 2233
54d01ffb
DG
2234 ret = kernel_stop_session(ksession);
2235 if (ret < 0) {
2236 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2237 goto error;
f3ed775e 2238 }
54d01ffb
DG
2239
2240 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2241 }
54d01ffb
DG
2242
2243 /* TODO : User-space tracer */
2244
2245 ret = LTTCOMM_OK;
2246
2247error:
2248 return ret;
2249}
2250
2251/*
2252 * Command LTTNG_CREATE_SESSION processed by the client thread.
2253 */
2254static int cmd_create_session(char *name, char *path)
2255{
2256 int ret;
2257
2258 ret = session_create(name, path);
2259 if (ret != LTTCOMM_OK) {
2260 goto error;
2261 }
2262
2263 ret = LTTCOMM_OK;
2264
2265error:
2266 return ret;
2267}
2268
2269/*
2270 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2271 */
2272static int cmd_destroy_session(struct ltt_session *session, char *name)
2273{
2274 int ret;
2275
2276 /* Clean kernel session teardown */
2277 teardown_kernel_session(session);
2278
2279 /*
2280 * Must notify the kernel thread here to update it's poll setin order
2281 * to remove the channel(s)' fd just destroyed.
2282 */
2283 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2284 if (ret < 0) {
2285 perror("write kernel poll pipe");
2286 }
2287
2288 ret = session_destroy(name);
2289
2290 return ret;
2291}
2292
2293/*
2294 * Command LTTNG_CALIBRATE processed by the client thread.
2295 */
2296static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2297{
2298 int ret;
2299
2300 switch (domain) {
2301 case LTTNG_DOMAIN_KERNEL:
33a2b854 2302 {
54d01ffb 2303 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2304
54d01ffb
DG
2305 kcalibrate.type = calibrate->type;
2306 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2307 if (ret < 0) {
54d01ffb
DG
2308 ret = LTTCOMM_KERN_ENABLE_FAIL;
2309 goto error;
33a2b854 2310 }
54d01ffb
DG
2311 break;
2312 }
2313 default:
2314 /* TODO: Userspace tracing */
2315 ret = LTTCOMM_NOT_IMPLEMENTED;
2316 goto error;
2317 }
33a2b854 2318
54d01ffb 2319 ret = LTTCOMM_OK;
33a2b854 2320
54d01ffb
DG
2321error:
2322 return ret;
2323}
7d29a247 2324
54d01ffb
DG
2325/*
2326 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2327 */
2328static int cmd_register_consumer(struct ltt_session *session, int domain,
2329 char *sock_path)
2330{
2331 int ret, sock;
b389abbe 2332
54d01ffb
DG
2333 switch (domain) {
2334 case LTTNG_DOMAIN_KERNEL:
2335 /* Can't register a consumer if there is already one */
2336 if (session->kernel_session->consumer_fd != 0) {
2337 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2338 goto error;
2339 }
2340
2341 sock = lttcomm_connect_unix_sock(sock_path);
2342 if (sock < 0) {
2343 ret = LTTCOMM_CONNECT_FAIL;
2344 goto error;
2345 }
2346
2347 session->kernel_session->consumer_fd = sock;
2348 break;
2349 default:
2350 /* TODO: Userspace tracing */
2351 ret = LTTCOMM_NOT_IMPLEMENTED;
2352 goto error;
2353 }
2354
2355 ret = LTTCOMM_OK;
2356
2357error:
2358 return ret;
2359}
2360
2361/*
2362 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2363 */
2364static ssize_t cmd_list_domains(struct ltt_session *session,
2365 struct lttng_domain **domains)
2366{
2367 int ret;
2368 ssize_t nb_dom = 0;
2369
2370 if (session->kernel_session != NULL) {
2371 nb_dom++;
2372 }
2373
2374 nb_dom += session->ust_session_list.count;
2375
2376 *domains = malloc(nb_dom * sizeof(struct lttng_domain));
2377 if (*domains == NULL) {
2378 ret = -LTTCOMM_FATAL;
2379 goto error;
2380 }
2381
2382 (*domains)[0].type = LTTNG_DOMAIN_KERNEL;
2383
2384 /* TODO: User-space tracer domain support */
2385
2386 return nb_dom;
2387
2388error:
2389 return ret;
2390}
2391
2392/*
2393 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2394 */
2395static ssize_t cmd_list_channels(struct ltt_session *session,
2396 struct lttng_channel **channels)
2397{
2398 int ret;
2399 ssize_t nb_chan = 0;
2400
2401 if (session->kernel_session != NULL) {
2402 nb_chan += session->kernel_session->channel_count;
2403 }
2404
2405 *channels = malloc(nb_chan * sizeof(struct lttng_channel));
2406 if (*channels == NULL) {
2407 ret = -LTTCOMM_FATAL;
2408 goto error;
2409 }
2410
2411 list_lttng_channels(session, *channels);
2412
2413 return nb_chan;
2414
2415error:
2416 return ret;
2417}
2418
2419/*
2420 * Command LTTNG_LIST_EVENTS processed by the client thread.
2421 */
2422static ssize_t cmd_list_events(struct ltt_session *session,
2423 char *channel_name, struct lttng_event **events)
2424{
2425 int ret;
2426 ssize_t nb_event = 0;
2427 struct ltt_kernel_channel *kchan = NULL;
2428
2429 if (session->kernel_session != NULL) {
2430 kchan = trace_kernel_get_channel_by_name(channel_name,
2431 session->kernel_session);
2432 if (kchan == NULL) {
2433 ret = -LTTCOMM_KERN_CHAN_NOT_FOUND;
2434 goto error;
2435 }
2436 nb_event += kchan->event_count;
2437 }
2438
2439 *events = malloc(nb_event * sizeof(struct lttng_event));
2440 if (*events == NULL) {
2441 ret = -LTTCOMM_FATAL;
2442 goto error;
2443 }
2444
2445 list_lttng_events(kchan, *events);
2446
2447 /* TODO: User-space tracer support */
2448
2449 return nb_event;
2450
2451error:
2452 return ret;
2453}
2454
2455/*
2456 * Process the command requested by the lttng client within the command
2457 * context structure. This function make sure that the return structure (llm)
2458 * is set and ready for transmission before returning.
2459 *
2460 * Return any error encountered or 0 for success.
2461 */
2462static int process_client_msg(struct command_ctx *cmd_ctx)
2463{
2464 int ret = LTTCOMM_OK;
44d3bd01 2465 int need_tracing_session = 1;
54d01ffb
DG
2466
2467 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2468
2469 /*
2470 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2471 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2472 * command.
2473 */
2474 switch(cmd_ctx->lsm->cmd_type) {
2475 case LTTNG_LIST_SESSIONS:
2476 case LTTNG_LIST_TRACEPOINTS:
2477 case LTTNG_LIST_DOMAINS:
2478 case LTTNG_LIST_CHANNELS:
2479 case LTTNG_LIST_EVENTS:
2480 break;
2481 default:
2482 /* Setup lttng message with no payload */
2483 ret = setup_lttng_msg(cmd_ctx, 0);
2484 if (ret < 0) {
2485 /* This label does not try to unlock the session */
2486 goto init_setup_error;
2487 }
2488 }
2489
2490 /* Commands that DO NOT need a session. */
2491 switch (cmd_ctx->lsm->cmd_type) {
2492 case LTTNG_CALIBRATE:
2493 case LTTNG_CREATE_SESSION:
2494 case LTTNG_LIST_SESSIONS:
2495 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2496 need_tracing_session = 0;
54d01ffb
DG
2497 break;
2498 default:
2499 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
2500 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2501 if (cmd_ctx->session == NULL) {
2502 if (cmd_ctx->lsm->session.name != NULL) {
2503 ret = LTTCOMM_SESS_NOT_FOUND;
2504 } else {
2505 /* If no session name specified */
2506 ret = LTTCOMM_SELECT_SESS;
2507 }
2508 goto error;
2509 } else {
2510 /* Acquire lock for the session */
2511 session_lock(cmd_ctx->session);
2512 }
2513 break;
2514 }
b389abbe 2515
54d01ffb
DG
2516 /*
2517 * Check domain type for specific "pre-action".
2518 */
2519 switch (cmd_ctx->lsm->domain.type) {
2520 case LTTNG_DOMAIN_KERNEL:
2521 /* Kernel tracer check */
2522 if (kernel_tracer_fd == 0) {
2523 /* Basically, load kernel tracer modules */
2524 init_kernel_tracer();
2525 if (kernel_tracer_fd == 0) {
2526 ret = LTTCOMM_KERN_NA;
2527 goto error;
2528 }
2529 }
5eb91c98 2530
54d01ffb 2531 /* Need a session for kernel command */
44d3bd01 2532 if (need_tracing_session) {
54d01ffb
DG
2533 if (cmd_ctx->session->kernel_session == NULL) {
2534 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2535 if (ret < 0) {
54d01ffb 2536 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2537 goto error;
2538 }
b389abbe 2539 }
7d29a247 2540
54d01ffb
DG
2541 /* Start the kernel consumer daemon */
2542 if (kconsumerd_pid == 0 &&
2543 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2544 ret = start_kconsumerd();
7d29a247 2545 if (ret < 0) {
54d01ffb
DG
2546 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2547 goto error;
950131af 2548 }
33a2b854 2549 }
0d0c377a 2550 }
54d01ffb 2551 break;
44d3bd01
DG
2552 case LTTNG_DOMAIN_UST_PID:
2553 {
2554 struct ltt_ust_session *usess;
2555
2556 if (need_tracing_session) {
2557 usess = trace_ust_get_session_by_pid(
2558 &cmd_ctx->session->ust_session_list,
2559 cmd_ctx->lsm->domain.attr.pid);
2560 if (usess == NULL) {
2561 ret = create_ust_session(cmd_ctx->session,
2562 &cmd_ctx->lsm->domain);
2563 if (ret != LTTCOMM_OK) {
2564 goto error;
2565 }
2566 }
2567 }
2568 break;
2569 }
54d01ffb
DG
2570 default:
2571 /* TODO Userspace tracer */
2572 break;
2573 }
33a2b854 2574
54d01ffb
DG
2575 /* Process by command type */
2576 switch (cmd_ctx->lsm->cmd_type) {
2577 case LTTNG_ADD_CONTEXT:
2578 {
2579 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2580 cmd_ctx->lsm->u.context.channel_name,
2581 cmd_ctx->lsm->u.context.event_name,
2582 &cmd_ctx->lsm->u.context.ctx);
2583 break;
2584 }
2585 case LTTNG_DISABLE_CHANNEL:
2586 {
2587 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2588 cmd_ctx->lsm->u.disable.channel_name);
2589 break;
2590 }
2591 case LTTNG_DISABLE_EVENT:
2592 {
2593 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2594 cmd_ctx->lsm->u.disable.channel_name,
2595 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2596 ret = LTTCOMM_OK;
2597 break;
2598 }
54d01ffb
DG
2599 case LTTNG_DISABLE_ALL_EVENT:
2600 {
2601 DBG("Disabling all kernel event");
2602
2603 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2604 cmd_ctx->lsm->u.disable.channel_name);
2605 break;
2606 }
2607 case LTTNG_ENABLE_CHANNEL:
2608 {
44d3bd01 2609 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG
2610 &cmd_ctx->lsm->u.channel.chan);
2611 break;
2612 }
2613 case LTTNG_ENABLE_EVENT:
2614 {
2615 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2616 cmd_ctx->lsm->u.enable.channel_name,
2617 &cmd_ctx->lsm->u.enable.event);
2618 break;
2619 }
2620 case LTTNG_ENABLE_ALL_EVENT:
2621 {
2622 DBG("Enabling all kernel event");
2623
2624 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
2625 cmd_ctx->lsm->u.enable.channel_name,
2626 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
2627 break;
2628 }
052da939 2629 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2630 {
9f19cc17 2631 struct lttng_event *events;
54d01ffb 2632 ssize_t nb_events;
052da939 2633
54d01ffb
DG
2634 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2635 if (nb_events < 0) {
2636 ret = -nb_events;
2637 goto error;
2ef84c95
DG
2638 }
2639
2640 /*
2641 * Setup lttng message with payload size set to the event list size in
2642 * bytes and then copy list into the llm payload.
2643 */
052da939 2644 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2645 if (ret < 0) {
052da939 2646 free(events);
2ef84c95
DG
2647 goto setup_error;
2648 }
2649
2650 /* Copy event list into message payload */
9f19cc17 2651 memcpy(cmd_ctx->llm->payload, events,
052da939 2652 sizeof(struct lttng_event) * nb_events);
2ef84c95 2653
9f19cc17 2654 free(events);
2ef84c95
DG
2655
2656 ret = LTTCOMM_OK;
2657 break;
2658 }
f3ed775e 2659 case LTTNG_START_TRACE:
8c0faa1d 2660 {
54d01ffb 2661 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2662 break;
2663 }
f3ed775e 2664 case LTTNG_STOP_TRACE:
8c0faa1d 2665 {
54d01ffb 2666 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2667 break;
2668 }
5e16da05
MD
2669 case LTTNG_CREATE_SESSION:
2670 {
54d01ffb
DG
2671 ret = cmd_create_session(cmd_ctx->lsm->session.name,
2672 cmd_ctx->lsm->session.path);
5e16da05
MD
2673 break;
2674 }
2675 case LTTNG_DESTROY_SESSION:
2676 {
54d01ffb
DG
2677 ret = cmd_destroy_session(cmd_ctx->session,
2678 cmd_ctx->lsm->session.name);
5461b305 2679 break;
5e16da05 2680 }
9f19cc17 2681 case LTTNG_LIST_DOMAINS:
5e16da05 2682 {
54d01ffb
DG
2683 ssize_t nb_dom;
2684 struct lttng_domain *domains;
5461b305 2685
54d01ffb
DG
2686 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2687 if (nb_dom < 0) {
2688 ret = -nb_dom;
2689 goto error;
ce3d728c 2690 }
520ff687 2691
54d01ffb 2692 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
2693 if (ret < 0) {
2694 goto setup_error;
520ff687 2695 }
57167058 2696
54d01ffb
DG
2697 /* Copy event list into message payload */
2698 memcpy(cmd_ctx->llm->payload, domains,
2699 nb_dom * sizeof(struct lttng_domain));
2700
2701 free(domains);
5e16da05 2702
5461b305 2703 ret = LTTCOMM_OK;
5e16da05
MD
2704 break;
2705 }
9f19cc17 2706 case LTTNG_LIST_CHANNELS:
5e16da05 2707 {
54d01ffb
DG
2708 size_t nb_chan;
2709 struct lttng_channel *channels;
2710
2711 nb_chan = cmd_list_channels(cmd_ctx->session, &channels);
2712 if (nb_chan < 0) {
2713 ret = -nb_chan;
2714 goto error;
5461b305 2715 }
ca95a216 2716
54d01ffb 2717 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
2718 if (ret < 0) {
2719 goto setup_error;
2720 }
9f19cc17 2721
54d01ffb
DG
2722 /* Copy event list into message payload */
2723 memcpy(cmd_ctx->llm->payload, channels,
2724 nb_chan * sizeof(struct lttng_channel));
2725
2726 free(channels);
9f19cc17
DG
2727
2728 ret = LTTCOMM_OK;
5461b305 2729 break;
5e16da05 2730 }
9f19cc17 2731 case LTTNG_LIST_EVENTS:
5e16da05 2732 {
54d01ffb 2733 size_t nb_event;
684d34d2 2734 struct lttng_event *events = NULL;
9f19cc17 2735
54d01ffb
DG
2736 nb_event = cmd_list_events(cmd_ctx->session,
2737 cmd_ctx->lsm->u.list.channel_name, &events);
2738 if (nb_event < 0) {
2739 ret = -nb_event;
2740 goto error;
5461b305 2741 }
ca95a216 2742
54d01ffb 2743 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
2744 if (ret < 0) {
2745 goto setup_error;
2746 }
9f19cc17 2747
54d01ffb
DG
2748 /* Copy event list into message payload */
2749 memcpy(cmd_ctx->llm->payload, events,
2750 nb_event * sizeof(struct lttng_event));
9f19cc17 2751
54d01ffb 2752 free(events);
9f19cc17
DG
2753
2754 ret = LTTCOMM_OK;
5461b305 2755 break;
5e16da05
MD
2756 }
2757 case LTTNG_LIST_SESSIONS:
2758 {
54d01ffb 2759 session_lock_list();
5461b305 2760
6c9cc2ab 2761 if (session_list_ptr->count == 0) {
f3ed775e 2762 ret = LTTCOMM_NO_SESSION;
54d01ffb 2763 session_unlock_list();
5461b305 2764 goto error;
57167058 2765 }
5e16da05 2766
6c9cc2ab
DG
2767 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
2768 session_list_ptr->count);
5461b305 2769 if (ret < 0) {
54d01ffb 2770 session_unlock_list();
5461b305 2771 goto setup_error;
e065084a 2772 }
5e16da05 2773
6c9cc2ab
DG
2774 /* Filled the session array */
2775 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
2776
54d01ffb 2777 session_unlock_list();
5e16da05 2778
5461b305 2779 ret = LTTCOMM_OK;
5e16da05
MD
2780 break;
2781 }
d0254c7c
MD
2782 case LTTNG_CALIBRATE:
2783 {
54d01ffb
DG
2784 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
2785 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
2786 break;
2787 }
d9800920
DG
2788 case LTTNG_REGISTER_CONSUMER:
2789 {
54d01ffb
DG
2790 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2791 cmd_ctx->lsm->u.reg.path);
d9800920
DG
2792 break;
2793 }
5e16da05 2794 default:
5e16da05 2795 ret = LTTCOMM_UND;
5461b305 2796 break;
fac6795d
DG
2797 }
2798
5461b305 2799error:
5461b305
DG
2800 if (cmd_ctx->llm == NULL) {
2801 DBG("Missing llm structure. Allocating one.");
894be886 2802 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
2803 goto setup_error;
2804 }
2805 }
54d01ffb 2806 /* Set return code */
5461b305 2807 cmd_ctx->llm->ret_code = ret;
5461b305 2808setup_error:
b5541356 2809 if (cmd_ctx->session) {
54d01ffb 2810 session_unlock(cmd_ctx->session);
b5541356 2811 }
54d01ffb 2812init_setup_error:
8028d920 2813 return ret;
fac6795d
DG
2814}
2815
1d4b027a 2816/*
d063d709
DG
2817 * This thread manage all clients request using the unix client socket for
2818 * communication.
1d4b027a
DG
2819 */
2820static void *thread_manage_clients(void *data)
2821{
5eb91c98
DG
2822 int sock = 0, ret, i, pollfd;
2823 uint32_t revents, nb_fd;
273ea72c 2824 struct command_ctx *cmd_ctx = NULL;
5eb91c98 2825 struct lttng_poll_event events;
1d4b027a
DG
2826
2827 DBG("[thread] Manage client started");
2828
2829 ret = lttcomm_listen_unix_sock(client_sock);
2830 if (ret < 0) {
2831 goto error;
2832 }
2833
5eb91c98
DG
2834 /*
2835 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2836 * more will be added to this poll set.
2837 */
2838 ret = create_thread_poll_set(&events, 2);
2839 if (ret < 0) {
2840 goto error;
2841 }
273ea72c 2842
5eb91c98
DG
2843 /* Add the application registration socket */
2844 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2845 if (ret < 0) {
2846 goto error;
2847 }
273ea72c 2848
bbd973c2
DG
2849 /*
2850 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
2851 */
2852 if (opt_sig_parent) {
2853 kill(ppid, SIGCHLD);
2854 }
2855
2856 while (1) {
1d4b027a 2857 DBG("Accepting client command ...");
273ea72c 2858
5eb91c98
DG
2859 nb_fd = LTTNG_POLL_GETNB(&events);
2860
273ea72c 2861 /* Inifinite blocking call, waiting for transmission */
5eb91c98 2862 ret = lttng_poll_wait(&events, -1);
273ea72c 2863 if (ret < 0) {
273ea72c
DG
2864 goto error;
2865 }
2866
5eb91c98
DG
2867 for (i = 0; i < nb_fd; i++) {
2868 /* Fetch once the poll data */
2869 revents = LTTNG_POLL_GETEV(&events, i);
2870 pollfd = LTTNG_POLL_GETFD(&events, i);
2871
2872 /* Thread quit pipe has been closed. Killing thread. */
2873 ret = check_thread_quit_pipe(pollfd, revents);
2874 if (ret) {
2875 goto error;
2876 }
2877
2878 /* Event on the registration socket */
2879 if (pollfd == client_sock) {
2880 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2881 ERR("Client socket poll error");
2882 goto error;
2883 }
2884 }
2885 }
2886
2887 DBG("Wait for client response");
2888
2889 sock = lttcomm_accept_unix_sock(client_sock);
2890 if (sock < 0) {
273ea72c 2891 goto error;
273ea72c
DG
2892 }
2893
5eb91c98
DG
2894 /* Allocate context command to process the client request */
2895 cmd_ctx = malloc(sizeof(struct command_ctx));
2896 if (cmd_ctx == NULL) {
2897 perror("malloc cmd_ctx");
1d4b027a 2898 goto error;
5eb91c98 2899 }
1d4b027a 2900
5eb91c98
DG
2901 /* Allocate data buffer for reception */
2902 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
2903 if (cmd_ctx->lsm == NULL) {
2904 perror("malloc cmd_ctx->lsm");
2905 goto error;
2906 }
1d4b027a 2907
5eb91c98
DG
2908 cmd_ctx->llm = NULL;
2909 cmd_ctx->session = NULL;
1d4b027a 2910
5eb91c98
DG
2911 /*
2912 * Data is received from the lttng client. The struct
2913 * lttcomm_session_msg (lsm) contains the command and data request of
2914 * the client.
2915 */
2916 DBG("Receiving data from client ...");
2917 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
2918 sizeof(struct lttcomm_session_msg));
2919 if (ret <= 0) {
2920 DBG("Nothing recv() from client... continuing");
2921 close(sock);
2922 free(cmd_ctx);
2923 continue;
2924 }
1d4b027a 2925
5eb91c98
DG
2926 // TODO: Validate cmd_ctx including sanity check for
2927 // security purpose.
f7776ea7 2928
5eb91c98
DG
2929 /*
2930 * This function dispatch the work to the kernel or userspace tracer
2931 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2932 * informations for the client. The command context struct contains
2933 * everything this function may needs.
2934 */
2935 ret = process_client_msg(cmd_ctx);
2936 if (ret < 0) {
bbd973c2 2937 /*
5eb91c98
DG
2938 * TODO: Inform client somehow of the fatal error. At
2939 * this point, ret < 0 means that a malloc failed
2940 * (ENOMEM). Error detected but still accept command.
bbd973c2 2941 */
bbd973c2 2942 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
2943 continue;
2944 }
d6e4fca4 2945
54d01ffb
DG
2946 DBG("Sending response (size: %d, retcode: %s)",
2947 cmd_ctx->lttng_msg_size,
532d79a7 2948 lttng_get_readable_code(-cmd_ctx->llm->ret_code));
54d01ffb 2949 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
2950 if (ret < 0) {
2951 ERR("Failed to send data back to client");
bbd973c2 2952 }
1d4b027a 2953
5eb91c98
DG
2954 clean_command_ctx(&cmd_ctx);
2955
2956 /* End of transmission */
273ea72c
DG
2957 close(sock);
2958 }
2959
5eb91c98
DG
2960error:
2961 DBG("Client thread dying");
273ea72c 2962 unlink(client_unix_sock_path);
5eb91c98
DG
2963 close(client_sock);
2964 close(sock);
273ea72c 2965
5eb91c98 2966 lttng_poll_clean(&events);
a2fb29a5 2967 clean_command_ctx(&cmd_ctx);
1d4b027a
DG
2968 return NULL;
2969}
2970
2971
fac6795d
DG
2972/*
2973 * usage function on stderr
2974 */
2975static void usage(void)
2976{
b716ce68 2977 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
2978 fprintf(stderr, " -h, --help Display this usage.\n");
2979 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
2980 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2981 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2982 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2983 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
2984 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2985 fprintf(stderr, " -V, --version Show version number.\n");
2986 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2987 fprintf(stderr, " -q, --quiet No output at all.\n");
2988 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
31f73cc9 2989 fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
fac6795d
DG
2990}
2991
2992/*
2993 * daemon argument parsing
2994 */
2995static int parse_args(int argc, char **argv)
2996{
2997 int c;
2998
2999 static struct option long_options[] = {
3000 { "client-sock", 1, 0, 'c' },
3001 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
3002 { "kconsumerd-cmd-sock", 1, 0, 0 },
3003 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 3004 { "daemonize", 0, 0, 'd' },
5b8719f5 3005 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
3006 { "help", 0, 0, 'h' },
3007 { "group", 1, 0, 'g' },
3008 { "version", 0, 0, 'V' },
75462a81 3009 { "quiet", 0, 0, 'q' },
3f9947db 3010 { "verbose", 0, 0, 'v' },
31f73cc9 3011 { "verbose-kconsumerd", 0, 0, 'Z' },
fac6795d
DG
3012 { NULL, 0, 0, 0 }
3013 };
3014
3015 while (1) {
3016 int option_index = 0;
54d01ffb
DG
3017 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z",
3018 long_options, &option_index);
fac6795d
DG
3019 if (c == -1) {
3020 break;
3021 }
3022
3023 switch (c) {
3024 case 0:
3025 fprintf(stderr, "option %s", long_options[option_index].name);
3026 if (optarg) {
3027 fprintf(stderr, " with arg %s\n", optarg);
3028 }
3029 break;
b716ce68 3030 case 'c':
fac6795d
DG
3031 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3032 break;
3033 case 'a':
3034 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3035 break;
3036 case 'd':
3037 opt_daemon = 1;
3038 break;
3039 case 'g':
3040 opt_tracing_group = strdup(optarg);
3041 break;
3042 case 'h':
3043 usage();
3044 exit(EXIT_FAILURE);
3045 case 'V':
3046 fprintf(stdout, "%s\n", VERSION);
3047 exit(EXIT_SUCCESS);
5b8719f5
DG
3048 case 'S':
3049 opt_sig_parent = 1;
3050 break;
d6f42150
DG
3051 case 'E':
3052 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
3053 break;
3054 case 'C':
3055 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3056 break;
75462a81
DG
3057 case 'q':
3058 opt_quiet = 1;
3059 break;
3f9947db 3060 case 'v':
53086306
DG
3061 /* Verbose level can increase using multiple -v */
3062 opt_verbose += 1;
3f9947db 3063 break;
31f73cc9
MD
3064 case 'Z':
3065 opt_verbose_kconsumerd += 1;
3066 break;
fac6795d
DG
3067 default:
3068 /* Unknown option or other error.
3069 * Error is printed by getopt, just return */
3070 return -1;
3071 }
3072 }
3073
3074 return 0;
3075}
3076
3077/*
d063d709 3078 * Creates the two needed socket by the daemon.
d6f42150
DG
3079 * apps_sock - The communication socket for all UST apps.
3080 * client_sock - The communication of the cli tool (lttng).
fac6795d 3081 */
cf3af59e 3082static int init_daemon_socket(void)
fac6795d
DG
3083{
3084 int ret = 0;
3085 mode_t old_umask;
3086
3087 old_umask = umask(0);
3088
3089 /* Create client tool unix socket */
d6f42150
DG
3090 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3091 if (client_sock < 0) {
3092 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
3093 ret = -1;
3094 goto end;
3095 }
3096
3097 /* File permission MUST be 660 */
3098 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3099 if (ret < 0) {
d6f42150 3100 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
3101 perror("chmod");
3102 goto end;
3103 }
3104
3105 /* Create the application unix socket */
d6f42150
DG
3106 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3107 if (apps_sock < 0) {
3108 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
3109 ret = -1;
3110 goto end;
3111 }
3112
d6f42150 3113 /* File permission MUST be 666 */
54d01ffb
DG
3114 ret = chmod(apps_unix_sock_path,
3115 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3116 if (ret < 0) {
d6f42150 3117 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
3118 perror("chmod");
3119 goto end;
3120 }
3121
3122end:
3123 umask(old_umask);
3124 return ret;
3125}
3126
3127/*
54d01ffb
DG
3128 * Check if the global socket is available, and if a daemon is answering at the
3129 * other side. If yes, error is returned.
fac6795d 3130 */
cf3af59e 3131static int check_existing_daemon(void)
fac6795d 3132{
7d8234d9 3133 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3134 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3135 return 0;
099e26bd 3136 }
54d01ffb 3137
7d8234d9 3138 /* Is there anybody out there ? */
099e26bd 3139 if (lttng_session_daemon_alive()) {
7d8234d9 3140 return -EEXIST;
099e26bd 3141 } else {
7d8234d9 3142 return 0;
099e26bd 3143 }
fac6795d
DG
3144}
3145
fac6795d 3146/*
d063d709 3147 * Set the tracing group gid onto the client socket.
5e16da05 3148 *
d063d709
DG
3149 * Race window between mkdir and chown is OK because we are going from more
3150 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3151 */
d6f42150 3152static int set_permissions(void)
fac6795d
DG
3153{
3154 int ret;
996b65c8 3155 gid_t gid;
fac6795d 3156
996b65c8
MD
3157 gid = allowed_group();
3158 if (gid < 0) {
a463f419
DG
3159 if (is_root) {
3160 WARN("No tracing group detected");
3161 ret = 0;
3162 } else {
3163 ERR("Missing tracing group. Aborting execution.");
3164 ret = -1;
3165 }
fac6795d
DG
3166 goto end;
3167 }
3168
d6f42150 3169 /* Set lttng run dir */
996b65c8 3170 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG
3171 if (ret < 0) {
3172 ERR("Unable to set group on " LTTNG_RUNDIR);
3173 perror("chown");
3174 }
3175
3176 /* lttng client socket path */
996b65c8 3177 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3178 if (ret < 0) {
d6f42150
DG
3179 ERR("Unable to set group on %s", client_unix_sock_path);
3180 perror("chown");
3181 }
3182
3183 /* kconsumerd error socket path */
996b65c8 3184 ret = chown(kconsumerd_err_unix_sock_path, 0, gid);
d6f42150
DG
3185 if (ret < 0) {
3186 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
3187 perror("chown");
3188 }
3189
d6f42150 3190 DBG("All permissions are set");
e07ae692 3191
fac6795d
DG
3192end:
3193 return ret;
3194}
3195
7a485870 3196/*
d063d709 3197 * Create the pipe used to wake up the kernel thread.
7a485870
DG
3198 */
3199static int create_kernel_poll_pipe(void)
3200{
3201 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3202}
3203
099e26bd
DG
3204/*
3205 * Create the application command pipe to wake thread_manage_apps.
3206 */
3207static int create_apps_cmd_pipe(void)
3208{
3209 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3210}
3211
d6f42150 3212/*
d063d709 3213 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG
3214 */
3215static int create_lttng_rundir(void)
3216{
3217 int ret;
3218
3219 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
3220 if (ret < 0) {
b1f11e69
DG
3221 if (errno != EEXIST) {
3222 ERR("Unable to create " LTTNG_RUNDIR);
3223 goto error;
3224 } else {
3225 ret = 0;
3226 }
d6f42150
DG
3227 }
3228
3229error:
3230 return ret;
3231}
3232
3233/*
d063d709
DG
3234 * Setup sockets and directory needed by the kconsumerd communication with the
3235 * session daemon.
d6f42150
DG
3236 */
3237static int set_kconsumerd_sockets(void)
3238{
3239 int ret;
3240
3241 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
54d01ffb
DG
3242 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX,
3243 KCONSUMERD_ERR_SOCK_PATH);
d6f42150
DG
3244 }
3245
3246 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
54d01ffb
DG
3247 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX,
3248 KCONSUMERD_CMD_SOCK_PATH);
d6f42150
DG
3249 }
3250
3251 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
3252 if (ret < 0) {
6beb2242
DG
3253 if (errno != EEXIST) {
3254 ERR("Failed to create " KCONSUMERD_PATH);
3255 goto error;
3256 }
3257 ret = 0;
d6f42150
DG
3258 }
3259
3260 /* Create the kconsumerd error unix socket */
54d01ffb
DG
3261 kconsumerd_err_sock =
3262 lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
d6f42150
DG
3263 if (kconsumerd_err_sock < 0) {
3264 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
3265 ret = -1;
3266 goto error;
3267 }
3268
3269 /* File permission MUST be 660 */
54d01ffb
DG
3270 ret = chmod(kconsumerd_err_unix_sock_path,
3271 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150
DG
3272 if (ret < 0) {
3273 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
3274 perror("chmod");
3275 goto error;
3276 }
3277
3278error:
3279 return ret;
3280}
3281
fac6795d 3282/*
d063d709 3283 * Signal handler for the daemon
cf3af59e 3284 *
54d01ffb
DG
3285 * Simply stop all worker threads, leaving main() return gracefully after
3286 * joining all threads and calling cleanup().
fac6795d
DG
3287 */
3288static void sighandler(int sig)
3289{
3290 switch (sig) {
cf3af59e
MD
3291 case SIGPIPE:
3292 DBG("SIGPIPE catched");
3293 return;
3294 case SIGINT:
3295 DBG("SIGINT catched");
3296 stop_threads();
3297 break;
3298 case SIGTERM:
3299 DBG("SIGTERM catched");
3300 stop_threads();
3301 break;
3302 default:
3303 break;
fac6795d 3304 }
fac6795d
DG
3305}
3306
3307/*
d063d709 3308 * Setup signal handler for :
1d4b027a 3309 * SIGINT, SIGTERM, SIGPIPE
fac6795d 3310 */
1d4b027a 3311static int set_signal_handler(void)
fac6795d 3312{
1d4b027a
DG
3313 int ret = 0;
3314 struct sigaction sa;
3315 sigset_t sigset;
fac6795d 3316
1d4b027a
DG
3317 if ((ret = sigemptyset(&sigset)) < 0) {
3318 perror("sigemptyset");
3319 return ret;
3320 }
d6f42150 3321
1d4b027a
DG
3322 sa.sa_handler = sighandler;
3323 sa.sa_mask = sigset;
3324 sa.sa_flags = 0;
3325 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
3326 perror("sigaction");
3327 return ret;
d6f42150
DG
3328 }
3329
1d4b027a
DG
3330 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
3331 perror("sigaction");
3332 return ret;
d6f42150 3333 }
aaf26714 3334
1d4b027a
DG
3335 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3336 perror("sigaction");
3337 return ret;
8c0faa1d
DG
3338 }
3339
1d4b027a
DG
3340 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3341
3342 return ret;
fac6795d
DG
3343}
3344
f3ed775e 3345/*
d063d709
DG
3346 * Set open files limit to unlimited. This daemon can open a large number of
3347 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
3348 */
3349static void set_ulimit(void)
3350{
3351 int ret;
3352 struct rlimit lim;
3353
a88df331 3354 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
3355 lim.rlim_cur = 65535;
3356 lim.rlim_max = 65535;
3357
3358 ret = setrlimit(RLIMIT_NOFILE, &lim);
3359 if (ret < 0) {
3360 perror("failed to set open files limit");
3361 }
3362}
3363
fac6795d
DG
3364/*
3365 * main
3366 */
3367int main(int argc, char **argv)
3368{
fac6795d
DG
3369 int ret = 0;
3370 void *status;
b082db07 3371 const char *home_path;
fac6795d 3372
273ea72c 3373 /* Create thread quit pipe */
cf3af59e
MD
3374 if ((ret = init_thread_quit_pipe()) < 0) {
3375 goto error;
273ea72c
DG
3376 }
3377
fac6795d
DG
3378 /* Parse arguments */
3379 progname = argv[0];
3380 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 3381 goto error;
fac6795d
DG
3382 }
3383
3384 /* Daemonize */
3385 if (opt_daemon) {
53094c05
DG
3386 ret = daemon(0, 0);
3387 if (ret < 0) {
3388 perror("daemon");
cf3af59e 3389 goto error;
53094c05 3390 }
fac6795d
DG
3391 }
3392
3393 /* Check if daemon is UID = 0 */
3394 is_root = !getuid();
3395
fac6795d 3396 if (is_root) {
d6f42150
DG
3397 ret = create_lttng_rundir();
3398 if (ret < 0) {
cf3af59e 3399 goto error;
d6f42150
DG
3400 }
3401
fac6795d 3402 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
3403 snprintf(apps_unix_sock_path, PATH_MAX,
3404 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
3405 }
3406
3407 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
3408 snprintf(client_unix_sock_path, PATH_MAX,
3409 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
3410 }
0fdd1e2c
DG
3411
3412 /* Set global SHM for ust */
3413 if (strlen(wait_shm_path) == 0) {
3414 snprintf(wait_shm_path, PATH_MAX,
3415 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
3416 }
fac6795d 3417 } else {
b082db07
DG
3418 home_path = get_home_dir();
3419 if (home_path == NULL) {
273ea72c
DG
3420 /* TODO: Add --socket PATH option */
3421 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD
3422 ret = -EPERM;
3423 goto error;
b082db07
DG
3424 }
3425
fac6795d 3426 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 3427 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 3428 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
3429 }
3430
3431 /* Set the cli tool unix socket path */
3432 if (strlen(client_unix_sock_path) == 0) {
d6f42150 3433 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 3434 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 3435 }
0fdd1e2c
DG
3436
3437 /* Set global SHM for ust */
3438 if (strlen(wait_shm_path) == 0) {
3439 snprintf(wait_shm_path, PATH_MAX,
3440 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
3441 }
fac6795d
DG
3442 }
3443
847177cd
DG
3444 DBG("Client socket path %s", client_unix_sock_path);
3445 DBG("Application socket path %s", apps_unix_sock_path);
3446
273ea72c 3447 /*
7d8234d9 3448 * See if daemon already exist.
fac6795d 3449 */
7d8234d9 3450 if ((ret = check_existing_daemon()) < 0) {
75462a81 3451 ERR("Already running daemon.\n");
273ea72c