Don't report an error when the last section of the path exist in mkdir_recursive
[lttng-tools.git] / ltt-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d
DG
38#include <unistd.h>
39
1e307fab 40#include <ltt-kconsumerd.h>
e88129fc 41#include <lttng-sessiond-comm.h>
1e307fab
DG
42#include <lttng/lttng-kconsumerd.h>
43#include <lttngerr.h>
fac6795d 44
54d01ffb 45#include "channel.h"
5eb91c98 46#include "compat/poll.h"
099e26bd 47#include "context.h"
54d01ffb 48#include "event.h"
099e26bd 49#include "futex.h"
20fe2104 50#include "kernel-ctl.h"
1e307fab 51#include "ltt-sessiond.h"
0fdd1e2c 52#include "shm.h"
56fff090 53#include "ust-app.h"
1e307fab 54#include "ust-ctl.h"
8e68d1c8 55#include "utils.h"
0177d773 56#include "ust-ctl.h"
fac6795d 57
75462a81 58/* Const values */
686204ab 59const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 60const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
61const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
62const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
63
fac6795d 64/* Variables */
1d4b027a 65int opt_verbose; /* Not static for lttngerr.h */
31f73cc9 66int opt_verbose_kconsumerd; /* Not static for lttngerr.h */
1d4b027a 67int opt_quiet; /* Not static for lttngerr.h */
d063d709 68
fac6795d
DG
69const char *progname;
70const char *opt_tracing_group;
5b8719f5 71static int opt_sig_parent;
fac6795d
DG
72static int opt_daemon;
73static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a
DG
74static pid_t ppid; /* Parent PID for --sig-parent option */
75static pid_t kconsumerd_pid;
099e26bd 76static int dispatch_thread_exit;
fac6795d 77
54d01ffb
DG
78/* Global application Unix socket path */
79static char apps_unix_sock_path[PATH_MAX];
80/* Global client Unix socket path */
81static char client_unix_sock_path[PATH_MAX];
82/* kconsumerd error and command Unix socket path */
83static char kconsumerd_err_unix_sock_path[PATH_MAX];
84static char kconsumerd_cmd_unix_sock_path[PATH_MAX];
85/* global wait shm path for UST */
86static char wait_shm_path[PATH_MAX];
fac6795d 87
1d4b027a 88/* Sockets and FDs */
d6f42150
DG
89static int client_sock;
90static int apps_sock;
91static int kconsumerd_err_sock;
8c0faa1d 92static int kconsumerd_cmd_sock;
20fe2104 93static int kernel_tracer_fd;
7a485870 94static int kernel_poll_pipe[2];
1d4b027a 95
273ea72c
DG
96/*
97 * Quit pipe for all threads. This permits a single cancellation point
98 * for all threads when receiving an event on the pipe.
99 */
100static int thread_quit_pipe[2];
101
099e26bd
DG
102/*
103 * This pipe is used to inform the thread managing application communication
104 * that a command is queued and ready to be processed.
105 */
106static int apps_cmd_pipe[2];
107
1d4b027a 108/* Pthread, Mutexes and Semaphores */
8c0faa1d 109static pthread_t kconsumerd_thread;
1d4b027a 110static pthread_t apps_thread;
099e26bd 111static pthread_t reg_apps_thread;
1d4b027a 112static pthread_t client_thread;
7a485870 113static pthread_t kernel_thread;
099e26bd 114static pthread_t dispatch_thread;
8c0faa1d
DG
115static sem_t kconsumerd_sem;
116
5eb91c98
DG
117
118/* Mutex to control kconsumerd pid assignation */
119static pthread_mutex_t kconsumerd_pid_mutex;
fac6795d 120
099e26bd
DG
121/*
122 * UST registration command queue. This queue is tied with a futex and uses a N
123 * wakers / 1 waiter implemented and detailed in futex.c/.h
124 *
125 * The thread_manage_apps and thread_dispatch_ust_registration interact with
126 * this queue and the wait/wake scheme.
127 */
128static struct ust_cmd_queue ust_cmd_queue;
129
b5541356
DG
130/*
131 * Pointer initialized before thread creation.
132 *
133 * This points to the tracing session list containing the session count and a
134 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
135 * MUST NOT be taken if you call a public function in session.c.
04ea676f 136 *
d063d709 137 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 138 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
139 */
140static struct ltt_session_list *session_list_ptr;
141
5eb91c98
DG
142/*
143 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
144 */
145static int create_thread_poll_set(struct lttng_poll_event *events,
146 unsigned int size)
147{
148 int ret;
149
150 if (events == NULL || size == 0) {
151 ret = -1;
152 goto error;
153 }
154
155 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
156 if (ret < 0) {
157 goto error;
158 }
159
160 /* Add quit pipe */
161 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
162 if (ret < 0) {
163 goto error;
164 }
165
166 return 0;
167
168error:
169 return ret;
170}
171
172/*
173 * Check if the thread quit pipe was triggered.
174 *
175 * Return 1 if it was triggered else 0;
176 */
177static int check_thread_quit_pipe(int fd, uint32_t events)
178{
179 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
180 return 1;
181 }
182
183 return 0;
184}
185
0fdd1e2c
DG
186/*
187 * Remove modules in reverse load order.
188 */
189static int modprobe_remove_kernel_modules(void)
190{
191 int ret = 0, i;
192 char modprobe[256];
193
194 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
195 ret = snprintf(modprobe, sizeof(modprobe),
196 "/sbin/modprobe --remove --quiet %s",
197 kernel_modules_list[i].name);
198 if (ret < 0) {
199 perror("snprintf modprobe --remove");
200 goto error;
201 }
202 modprobe[sizeof(modprobe) - 1] = '\0';
203 ret = system(modprobe);
204 if (ret == -1) {
205 ERR("Unable to launch modprobe --remove for module %s",
206 kernel_modules_list[i].name);
207 } else if (kernel_modules_list[i].required
208 && WEXITSTATUS(ret) != 0) {
209 ERR("Unable to remove module %s",
210 kernel_modules_list[i].name);
211 } else {
212 DBG("Modprobe removal successful %s",
213 kernel_modules_list[i].name);
214 }
215 }
216
217error:
218 return ret;
219}
220
221/*
222 * Return group ID of the tracing group or -1 if not found.
223 */
996b65c8
MD
224static gid_t allowed_group(void)
225{
226 struct group *grp;
227
274e143b
MD
228 if (opt_tracing_group) {
229 grp = getgrnam(opt_tracing_group);
230 } else {
231 grp = getgrnam(default_tracing_group);
232 }
996b65c8
MD
233 if (!grp) {
234 return -1;
235 } else {
236 return grp->gr_gid;
237 }
238}
239
273ea72c 240/*
5eb91c98 241 * Init thread quit pipe.
273ea72c
DG
242 *
243 * Return -1 on error or 0 if all pipes are created.
244 */
245static int init_thread_quit_pipe(void)
246{
247 int ret;
248
249 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
250 if (ret < 0) {
251 perror("thread quit pipe");
252 goto error;
253 }
254
255error:
256 return ret;
257}
258
fac6795d 259/*
d063d709
DG
260 * Complete teardown of a kernel session. This free all data structure related
261 * to a kernel session and update counter.
fac6795d 262 */
1d4b027a 263static void teardown_kernel_session(struct ltt_session *session)
fac6795d 264{
1d4b027a
DG
265 if (session->kernel_session != NULL) {
266 DBG("Tearing down kernel session");
d9800920
DG
267
268 /*
269 * If a custom kernel consumer was registered, close the socket before
270 * tearing down the complete kernel session structure
271 */
272 if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) {
273 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
274 }
275
62499ad6 276 trace_kernel_destroy_session(session->kernel_session);
1d4b027a
DG
277 /* Extra precaution */
278 session->kernel_session = NULL;
fac6795d 279 }
fac6795d
DG
280}
281
099e26bd
DG
282/*
283 * Stop all threads by closing the thread quit pipe.
284 */
cf3af59e
MD
285static void stop_threads(void)
286{
5eb91c98
DG
287 int ret;
288
cf3af59e
MD
289 /* Stopping all threads */
290 DBG("Terminating all threads");
54d01ffb 291 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
292 if (ret < 0) {
293 ERR("write error on thread quit pipe");
294 }
295
099e26bd
DG
296 /* Dispatch thread */
297 dispatch_thread_exit = 1;
298 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
299}
300
fac6795d 301/*
d063d709 302 * Cleanup the daemon
fac6795d 303 */
cf3af59e 304static void cleanup(void)
fac6795d 305{
1d4b027a
DG
306 int ret;
307 char *cmd;
af9737e9 308 struct ltt_session *sess, *stmp;
fac6795d 309
1d4b027a 310 DBG("Cleaning up");
e07ae692 311
1d4b027a 312 /* <fun> */
2f50c8a3 313 MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
273ea72c
DG
314 "Matthew, BEET driven development works!%c[%dm",
315 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
1d4b027a 316 /* </fun> */
fac6795d 317
5eb91c98
DG
318 if (is_root) {
319 DBG("Removing %s directory", LTTNG_RUNDIR);
320 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
321 if (ret < 0) {
322 ERR("asprintf failed. Something is really wrong!");
323 }
5461b305 324
5eb91c98
DG
325 /* Remove lttng run directory */
326 ret = system(cmd);
327 if (ret < 0) {
328 ERR("Unable to clean " LTTNG_RUNDIR);
329 }
1d4b027a 330 }
5461b305 331
1d4b027a 332 DBG("Cleaning up all session");
fac6795d 333
b5541356 334 /* Destroy session list mutex */
273ea72c
DG
335 if (session_list_ptr != NULL) {
336 pthread_mutex_destroy(&session_list_ptr->lock);
337
338 /* Cleanup ALL session */
54d01ffb
DG
339 cds_list_for_each_entry_safe(sess, stmp,
340 &session_list_ptr->head, list) {
273ea72c
DG
341 teardown_kernel_session(sess);
342 // TODO complete session cleanup (including UST)
343 }
344 }
345
099e26bd 346 DBG("Closing all UST sockets");
56fff090 347 ust_app_clean_list();
099e26bd 348
273ea72c 349 pthread_mutex_destroy(&kconsumerd_pid_mutex);
b5541356 350
f3ed775e 351 DBG("Closing kernel fd");
1d4b027a 352 close(kernel_tracer_fd);
ab147185 353
2f50c8a3
DG
354 if (is_root) {
355 DBG("Unloading kernel modules");
356 modprobe_remove_kernel_modules();
357 }
5eb91c98
DG
358
359 close(thread_quit_pipe[0]);
360 close(thread_quit_pipe[1]);
fac6795d
DG
361}
362
e065084a 363/*
d063d709 364 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 365 *
d063d709 366 * Return lttcomm error code.
e065084a
DG
367 */
368static int send_unix_sock(int sock, void *buf, size_t len)
369{
370 /* Check valid length */
371 if (len <= 0) {
372 return -1;
373 }
374
375 return lttcomm_send_unix_sock(sock, buf, len);
376}
377
5461b305 378/*
d063d709 379 * Free memory of a command context structure.
5461b305 380 */
a2fb29a5 381static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 382{
a2fb29a5
DG
383 DBG("Clean command context structure");
384 if (*cmd_ctx) {
385 if ((*cmd_ctx)->llm) {
386 free((*cmd_ctx)->llm);
5461b305 387 }
a2fb29a5
DG
388 if ((*cmd_ctx)->lsm) {
389 free((*cmd_ctx)->lsm);
5461b305 390 }
a2fb29a5
DG
391 free(*cmd_ctx);
392 *cmd_ctx = NULL;
5461b305
DG
393 }
394}
395
f3ed775e 396/*
d063d709 397 * Send all stream fds of kernel channel to the consumer.
f3ed775e 398 */
54d01ffb
DG
399static int send_kconsumerd_channel_fds(int sock,
400 struct ltt_kernel_channel *channel)
f3ed775e
DG
401{
402 int ret;
403 size_t nb_fd;
404 struct ltt_kernel_stream *stream;
f3ed775e
DG
405 struct lttcomm_kconsumerd_header lkh;
406 struct lttcomm_kconsumerd_msg lkm;
407
54d01ffb
DG
408 DBG("Sending fds of channel %s to kernel consumer",
409 channel->channel->name);
7a485870
DG
410
411 nb_fd = channel->stream_count;
f3ed775e
DG
412
413 /* Setup header */
7a485870 414 lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg);
f3ed775e
DG
415 lkh.cmd_type = ADD_STREAM;
416
417 DBG("Sending kconsumerd header");
418
54d01ffb
DG
419 ret = lttcomm_send_unix_sock(sock, &lkh,
420 sizeof(struct lttcomm_kconsumerd_header));
f3ed775e
DG
421 if (ret < 0) {
422 perror("send kconsumerd header");
423 goto error;
424 }
425
7a485870
DG
426 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
427 if (stream->fd != 0) {
f3ed775e
DG
428 lkm.fd = stream->fd;
429 lkm.state = stream->state;
7a485870 430 lkm.max_sb_size = channel->channel->attr.subbuf_size;
e8b60857 431 lkm.output = channel->channel->attr.output;
f3ed775e 432 strncpy(lkm.path_name, stream->pathname, PATH_MAX);
99497cd0 433 lkm.path_name[PATH_MAX - 1] = '\0';
f3ed775e
DG
434
435 DBG("Sending fd %d to kconsumerd", lkm.fd);
436
54d01ffb
DG
437 ret = lttcomm_send_fds_unix_sock(sock, &lkm,
438 &lkm.fd, 1, sizeof(lkm));
f3ed775e
DG
439 if (ret < 0) {
440 perror("send kconsumerd fd");
441 goto error;
442 }
443 }
444 }
445
7a485870 446 DBG("Kconsumerd channel fds sent");
f3ed775e
DG
447
448 return 0;
449
450error:
451 return ret;
452}
453
454/*
d063d709 455 * Send all stream fds of the kernel session to the consumer.
f3ed775e 456 */
d9800920 457static int send_kconsumerd_fds(struct ltt_kernel_session *session)
f3ed775e
DG
458{
459 int ret;
460 struct ltt_kernel_channel *chan;
7a485870
DG
461 struct lttcomm_kconsumerd_header lkh;
462 struct lttcomm_kconsumerd_msg lkm;
463
464 /* Setup header */
465 lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg);
466 lkh.cmd_type = ADD_STREAM;
467
468 DBG("Sending kconsumerd header for metadata");
469
54d01ffb
DG
470 ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh,
471 sizeof(struct lttcomm_kconsumerd_header));
7a485870
DG
472 if (ret < 0) {
473 perror("send kconsumerd header");
474 goto error;
475 }
476
477 DBG("Sending metadata stream fd");
478
d9800920
DG
479 /* Extra protection. It's NOT suppose to be set to 0 at this point */
480 if (session->consumer_fd == 0) {
481 session->consumer_fd = kconsumerd_cmd_sock;
482 }
483
7a485870
DG
484 if (session->metadata_stream_fd != 0) {
485 /* Send metadata stream fd first */
486 lkm.fd = session->metadata_stream_fd;
487 lkm.state = ACTIVE_FD;
488 lkm.max_sb_size = session->metadata->conf->attr.subbuf_size;
8b270bdb 489 lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
7a485870 490 strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
99497cd0 491 lkm.path_name[PATH_MAX - 1] = '\0';
7a485870 492
54d01ffb
DG
493 ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm,
494 &lkm.fd, 1, sizeof(lkm));
7a485870
DG
495 if (ret < 0) {
496 perror("send kconsumerd fd");
497 goto error;
498 }
499 }
f3ed775e 500
f3ed775e 501 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
d9800920 502 ret = send_kconsumerd_channel_fds(session->consumer_fd, chan);
f3ed775e 503 if (ret < 0) {
7a485870 504 goto error;
f3ed775e
DG
505 }
506 }
507
7a485870
DG
508 DBG("Kconsumerd fds (metadata and channel streams) sent");
509
f3ed775e
DG
510 return 0;
511
512error:
513 return ret;
514}
515
fac6795d 516/*
0fdd1e2c 517 * Notify UST applications using the shm mmap futex.
fac6795d 518 */
0fdd1e2c 519static int notify_ust_apps(int active)
fac6795d 520{
0fdd1e2c 521 char *wait_shm_mmap;
fac6795d 522
0fdd1e2c 523 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 524
0fdd1e2c
DG
525 /* See shm.c for this call implying mmap, shm and futex calls */
526 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
527 if (wait_shm_mmap == NULL) {
fac6795d
DG
528 goto error;
529 }
530
0fdd1e2c
DG
531 /* Wake waiting process */
532 futex_wait_update((int32_t *) wait_shm_mmap, active);
533
534 /* Apps notified successfully */
535 return 0;
fac6795d
DG
536
537error:
0fdd1e2c 538 return -1;
fac6795d
DG
539}
540
e065084a 541/*
d063d709
DG
542 * Setup the outgoing data buffer for the response (llm) by allocating the
543 * right amount of memory and copying the original information from the lsm
544 * structure.
ca95a216 545 *
d063d709 546 * Return total size of the buffer pointed by buf.
ca95a216 547 */
5461b305 548static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 549{
f3ed775e 550 int ret, buf_size;
ca95a216 551
f3ed775e 552 buf_size = size;
5461b305
DG
553
554 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
555 if (cmd_ctx->llm == NULL) {
ca95a216 556 perror("malloc");
5461b305 557 ret = -ENOMEM;
ca95a216
DG
558 goto error;
559 }
560
5461b305
DG
561 /* Copy common data */
562 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 563 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 564
5461b305
DG
565 cmd_ctx->llm->data_size = size;
566 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
567
ca95a216
DG
568 return buf_size;
569
570error:
571 return ret;
572}
573
7a485870 574/*
5eb91c98 575 * Update the kernel poll set of all channel fd available over all tracing
d063d709 576 * session. Add the wakeup pipe at the end of the set.
7a485870 577 */
5eb91c98 578static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 579{
5eb91c98 580 int ret;
7a485870
DG
581 struct ltt_session *session;
582 struct ltt_kernel_channel *channel;
583
5eb91c98 584 DBG("Updating kernel poll set");
7a485870 585
54d01ffb 586 session_lock_list();
b5541356 587 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 588 session_lock(session);
7a485870 589 if (session->kernel_session == NULL) {
54d01ffb 590 session_unlock(session);
7a485870
DG
591 continue;
592 }
7a485870 593
54d01ffb
DG
594 cds_list_for_each_entry(channel,
595 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
596 /* Add channel fd to the kernel poll set */
597 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
598 if (ret < 0) {
54d01ffb 599 session_unlock(session);
5eb91c98
DG
600 goto error;
601 }
602 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 603 }
54d01ffb 604 session_unlock(session);
7a485870 605 }
54d01ffb 606 session_unlock_list();
7a485870 607
5eb91c98 608 return 0;
7a485870
DG
609
610error:
54d01ffb 611 session_unlock_list();
7a485870
DG
612 return -1;
613}
614
615/*
54d01ffb 616 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 617 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 618 *
d063d709 619 * Useful for CPU hotplug feature.
7a485870
DG
620 */
621static int update_kernel_stream(int fd)
622{
623 int ret = 0;
624 struct ltt_session *session;
625 struct ltt_kernel_channel *channel;
626
627 DBG("Updating kernel streams for channel fd %d", fd);
628
54d01ffb 629 session_lock_list();
b5541356 630 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 631 session_lock(session);
7a485870 632 if (session->kernel_session == NULL) {
54d01ffb 633 session_unlock(session);
7a485870
DG
634 continue;
635 }
d9800920
DG
636
637 /* This is not suppose to be 0 but this is an extra security check */
638 if (session->kernel_session->consumer_fd == 0) {
639 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
640 }
641
5eb91c98
DG
642 cds_list_for_each_entry(channel,
643 &session->kernel_session->channel_list.head, list) {
7a485870
DG
644 if (channel->fd == fd) {
645 DBG("Channel found, updating kernel streams");
646 ret = kernel_open_channel_stream(channel);
647 if (ret < 0) {
b3c750d2 648 goto error;
7a485870 649 }
d9800920 650
7a485870 651 /*
5eb91c98
DG
652 * Have we already sent fds to the consumer? If yes, it means
653 * that tracing is started so it is safe to send our updated
654 * stream fds.
7a485870
DG
655 */
656 if (session->kernel_session->kconsumer_fds_sent == 1) {
5eb91c98
DG
657 ret = send_kconsumerd_channel_fds(
658 session->kernel_session->consumer_fd, channel);
7a485870 659 if (ret < 0) {
b3c750d2 660 goto error;
7a485870
DG
661 }
662 }
b3c750d2 663 goto error;
7a485870
DG
664 }
665 }
54d01ffb 666 session_unlock(session);
7a485870 667 }
54d01ffb 668 session_unlock_list();
b3c750d2 669 return ret;
7a485870 670
b3c750d2 671error:
54d01ffb
DG
672 session_unlock(session);
673 session_unlock_list();
7a485870
DG
674 return ret;
675}
676
677/*
d063d709 678 * This thread manage event coming from the kernel.
7a485870 679 *
d063d709
DG
680 * Features supported in this thread:
681 * -) CPU Hotplug
7a485870
DG
682 */
683static void *thread_manage_kernel(void *data)
684{
5eb91c98
DG
685 int ret, i, pollfd, update_poll_flag = 1;
686 uint32_t revents, nb_fd;
7a485870 687 char tmp;
5eb91c98 688 struct lttng_poll_event events;
7a485870
DG
689
690 DBG("Thread manage kernel started");
691
5eb91c98
DG
692 ret = create_thread_poll_set(&events, 2);
693 if (ret < 0) {
694 goto error;
695 }
696
697 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
698 if (ret < 0) {
699 goto error;
700 }
701
7a485870
DG
702 while (1) {
703 if (update_poll_flag == 1) {
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 */
56fff090 989 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 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 */
56fff090 1002 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
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 1030 /* Socket closed */
56fff090 1031 ust_app_unregister(pollfd);
5eb91c98
DG
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 1434 if (ret < 0) {
7272acf5 1435 PERROR("Cannot create debugfs path");
b73401da
DG
1436 goto error;
1437 }
1438
1439 ret = mount(type, path, type, 0, NULL);
1440 if (ret < 0) {
7272acf5 1441 PERROR("Cannot mount debugfs");
b73401da
DG
1442 goto error;
1443 }
1444
1445 DBG("Mounted debugfs successfully at %s", path);
1446
1447error:
1448 return ret;
1449}
1450
8c0faa1d 1451/*
d063d709 1452 * Setup necessary data for kernel tracer action.
8c0faa1d 1453 */
f3ed775e 1454static void init_kernel_tracer(void)
8c0faa1d 1455{
b73401da
DG
1456 int ret;
1457 char *proc_mounts = "/proc/mounts";
1458 char line[256];
684d34d2 1459 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1460 FILE *fp;
1461
1462 /* Detect debugfs */
1463 fp = fopen(proc_mounts, "r");
1464 if (fp == NULL) {
1465 ERR("Unable to probe %s", proc_mounts);
1466 goto error;
1467 }
1468
1469 while (fgets(line, sizeof(line), fp) != NULL) {
1470 if (strstr(line, "debugfs") != NULL) {
1471 /* Remove first string */
1472 strtok(line, " ");
1473 /* Dup string here so we can reuse line later on */
1474 debugfs_path = strdup(strtok(NULL, " "));
1475 DBG("Got debugfs path : %s", debugfs_path);
1476 break;
1477 }
1478 }
1479
1480 fclose(fp);
1481
1482 /* Mount debugfs if needded */
1483 if (debugfs_path == NULL) {
1484 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1485 if (ret < 0) {
1486 perror("asprintf debugfs path");
1487 goto error;
1488 }
1489 ret = mount_debugfs(debugfs_path);
1490 if (ret < 0) {
7272acf5 1491 perror("Cannot mount debugfs");
b73401da
DG
1492 goto error;
1493 }
1494 }
1495
1496 /* Modprobe lttng kernel modules */
1497 ret = modprobe_kernel_modules();
1498 if (ret < 0) {
1499 goto error;
1500 }
1501
1502 /* Setup lttng kernel path */
1503 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1504 if (ret < 0) {
1505 perror("asprintf lttng path");
1506 goto error;
1507 }
1508
1509 /* Open debugfs lttng */
1510 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1511 if (kernel_tracer_fd < 0) {
b73401da
DG
1512 DBG("Failed to open %s", lttng_path);
1513 goto error;
8c0faa1d
DG
1514 }
1515
b73401da
DG
1516 free(lttng_path);
1517 free(debugfs_path);
f3ed775e 1518 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1519 return;
1520
1521error:
1522 if (lttng_path) {
1523 free(lttng_path);
1524 }
1525 if (debugfs_path) {
1526 free(debugfs_path);
1527 }
1528 WARN("No kernel tracer available");
1529 kernel_tracer_fd = 0;
1530 return;
f3ed775e 1531}
33a2b854 1532
f3ed775e 1533/*
54d01ffb 1534 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1535 */
54d01ffb 1536static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1537{
f40799e8 1538 int ret = 0;
8c0faa1d 1539
f3ed775e 1540 if (session->kconsumer_fds_sent == 0) {
d9800920 1541 /*
54d01ffb
DG
1542 * Assign default kernel consumer socket if no consumer assigned to the
1543 * kernel session. At this point, it's NOT suppose to be 0 but this is
1544 * an extra security check.
d9800920
DG
1545 */
1546 if (session->consumer_fd == 0) {
1547 session->consumer_fd = kconsumerd_cmd_sock;
1548 }
1549
1550 ret = send_kconsumerd_fds(session);
f3ed775e 1551 if (ret < 0) {
f3ed775e
DG
1552 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1553 goto error;
1554 }
1d4b027a 1555
f3ed775e
DG
1556 session->kconsumer_fds_sent = 1;
1557 }
1d4b027a
DG
1558
1559error:
1560 return ret;
8c0faa1d
DG
1561}
1562
0177d773
DG
1563/*
1564 * Create an UST session and add it to the session ust list.
1565 */
44d3bd01
DG
1566static int create_ust_session(struct ltt_session *session,
1567 struct lttng_domain *domain)
0177d773 1568{
44d3bd01 1569 int ret;
0177d773 1570 struct ltt_ust_session *lus;
56fff090 1571 struct ust_app *app;
44d3bd01
DG
1572
1573 switch (domain->type) {
1574 case LTTNG_DOMAIN_UST_PID:
56fff090 1575 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
1576 if (app == NULL) {
1577 ret = LTTCOMM_APP_NOT_FOUND;
1578 goto error;
1579 }
1580 break;
1581 default:
1582 goto error;
1583 }
0177d773
DG
1584
1585 DBG("Creating UST session");
1586
44d3bd01 1587 lus = trace_ust_create_session(session->path, domain->attr.pid, domain);
0177d773 1588 if (lus == NULL) {
44d3bd01 1589 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1590 goto error;
1591 }
1592
1593 ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG,
1594 geteuid(), allowed_group());
1595 if (ret < 0) {
1596 if (ret != -EEXIST) {
1597 ERR("Trace directory creation error");
44d3bd01 1598 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1599 goto error;
1600 }
1601 }
1602
1603 /* Create session on the UST tracer */
44d3bd01 1604 ret = ustctl_create_session(app->sock, lus);
0177d773 1605 if (ret < 0) {
44d3bd01 1606 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1607 goto error;
1608 }
1609
44d3bd01
DG
1610 cds_list_add(&lus->list, &session->ust_session_list.head);
1611 session->ust_session_list.count++;
1612
1613 return LTTCOMM_OK;
0177d773
DG
1614
1615error:
1616 free(lus);
1617 return ret;
1618}
1619
333f285e 1620/*
d063d709 1621 * Create a kernel tracer session then create the default channel.
333f285e 1622 */
f3ed775e 1623static int create_kernel_session(struct ltt_session *session)
333f285e 1624{
f3ed775e 1625 int ret;
f3ed775e
DG
1626
1627 DBG("Creating kernel session");
1628
1629 ret = kernel_create_session(session, kernel_tracer_fd);
1630 if (ret < 0) {
1631 ret = LTTCOMM_KERN_SESS_FAIL;
1632 goto error;
333f285e
DG
1633 }
1634
d9800920
DG
1635 /* Set kernel consumer socket fd */
1636 if (kconsumerd_cmd_sock) {
1637 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
1638 }
1639
63053e7c
DG
1640 ret = mkdir_recursive(session->kernel_session->trace_path,
1641 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1642 if (ret < 0) {
996b65c8 1643 if (ret != -EEXIST) {
7a485870
DG
1644 ERR("Trace directory creation error");
1645 goto error;
1646 }
1647 }
1648
f3ed775e
DG
1649error:
1650 return ret;
333f285e
DG
1651}
1652
6c9cc2ab
DG
1653/*
1654 * Using the session list, filled a lttng_session array to send back to the
1655 * client for session listing.
1656 *
1657 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1658 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1659 */
1660static void list_lttng_sessions(struct lttng_session *sessions)
1661{
1662 int i = 0;
1663 struct ltt_session *session;
1664
1665 DBG("Getting all available session");
1666 /*
1667 * Iterate over session list and append data after the control struct in
1668 * the buffer.
1669 */
1670 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1671 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1672 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1673 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1674 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1675 i++;
1676 }
1677}
1678
9f19cc17
DG
1679/*
1680 * Fill lttng_channel array of all channels.
1681 */
1682static void list_lttng_channels(struct ltt_session *session,
1683 struct lttng_channel *channels)
1684{
1685 int i = 0;
1686 struct ltt_kernel_channel *kchan;
1687
1688 DBG("Listing channels for session %s", session->name);
1689
1690 /* Kernel channels */
1691 if (session->kernel_session != NULL) {
54d01ffb
DG
1692 cds_list_for_each_entry(kchan,
1693 &session->kernel_session->channel_list.head, list) {
9f19cc17
DG
1694 /* Copy lttng_channel struct to array */
1695 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1696 channels[i].enabled = kchan->enabled;
1697 i++;
1698 }
1699 }
1700
1701 /* TODO: Missing UST listing */
1702}
1703
1704/*
1705 * Fill lttng_event array of all events in the channel.
1706 */
1707static void list_lttng_events(struct ltt_kernel_channel *kchan,
1708 struct lttng_event *events)
1709{
1710 /*
1711 * TODO: This is ONLY kernel. Need UST support.
1712 */
1713 int i = 0;
1714 struct ltt_kernel_event *event;
1715
1716 DBG("Listing events for channel %s", kchan->channel->name);
1717
1718 /* Kernel channels */
1719 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1720 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1721 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG
1722 events[i].enabled = event->enabled;
1723 switch (event->event->instrumentation) {
1724 case LTTNG_KERNEL_TRACEPOINT:
1725 events[i].type = LTTNG_EVENT_TRACEPOINT;
1726 break;
1727 case LTTNG_KERNEL_KPROBE:
1728 case LTTNG_KERNEL_KRETPROBE:
1729 events[i].type = LTTNG_EVENT_PROBE;
1730 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1731 sizeof(struct lttng_kernel_kprobe));
1732 break;
1733 case LTTNG_KERNEL_FUNCTION:
1734 events[i].type = LTTNG_EVENT_FUNCTION;
1735 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1736 sizeof(struct lttng_kernel_function));
1737 break;
0133c199
MD
1738 case LTTNG_KERNEL_NOOP:
1739 events[i].type = LTTNG_EVENT_NOOP;
1740 break;
a54bd42d
MD
1741 case LTTNG_KERNEL_SYSCALL:
1742 events[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1743 break;
7a3d1328
MD
1744 case LTTNG_KERNEL_ALL:
1745 assert(0);
1746 break;
9f19cc17
DG
1747 }
1748 i++;
1749 }
1750}
1751
fac6795d 1752/*
54d01ffb 1753 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1754 */
54d01ffb
DG
1755static int cmd_disable_channel(struct ltt_session *session,
1756 int domain, char *channel_name)
fac6795d 1757{
54d01ffb 1758 int ret;
379473d2 1759
54d01ffb
DG
1760 switch (domain) {
1761 case LTTNG_DOMAIN_KERNEL:
1762 ret = channel_kernel_disable(session->kernel_session,
1763 channel_name);
1764 if (ret != LTTCOMM_OK) {
333f285e
DG
1765 goto error;
1766 }
54d01ffb
DG
1767
1768 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 1769 break;
44d3bd01
DG
1770 case LTTNG_DOMAIN_UST_PID:
1771 break;
d0254c7c 1772 default:
44d3bd01 1773 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 1774 goto error;
20fe2104
DG
1775 }
1776
54d01ffb 1777 ret = LTTCOMM_OK;
d65106b1 1778
54d01ffb
DG
1779error:
1780 return ret;
1781}
1782
56fff090
DG
1783/*
1784 * Copy channel from attributes and set it in the application channel list.
1785 */
1786static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
1787 struct lttng_channel *attr, struct ust_app *app)
1788{
1789 int ret;
1790 struct ltt_ust_channel *uchan, *new_chan;
1791
1792 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1793 if (uchan == NULL) {
1794 ret = LTTCOMM_FATAL;
1795 goto error;
1796 }
1797
1798 new_chan = trace_ust_create_channel(attr, usess->path);
1799 if (new_chan == NULL) {
1800 PERROR("malloc ltt_ust_channel");
1801 ret = LTTCOMM_FATAL;
1802 goto error;
1803 }
1804
1805 ret = channel_ust_copy(new_chan, uchan);
1806 if (ret < 0) {
1807 ret = LTTCOMM_FATAL;
1808 goto error;
1809 }
1810
1811 /* Add channel to the ust app channel list */
1812 cds_list_add(&new_chan->list, &app->channels.head);
1813 app->channels.count++;
1814
1815error:
1816 return ret;
1817}
1818
54d01ffb
DG
1819/*
1820 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1821 */
44d3bd01
DG
1822static int cmd_enable_channel(struct ltt_session *session,
1823 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG
1824{
1825 int ret;
d65106b1 1826
44d3bd01
DG
1827 switch (domain->type) {
1828 case LTTNG_DOMAIN_KERNEL:
1829 {
1830 struct ltt_kernel_channel *kchan;
54d01ffb 1831
44d3bd01
DG
1832 kchan = trace_kernel_get_channel_by_name(attr->name,
1833 session->kernel_session);
1834 if (kchan == NULL) {
1835 ret = channel_kernel_create(session->kernel_session,
1836 attr, kernel_poll_pipe[1]);
1837 } else {
1838 ret = channel_kernel_enable(session->kernel_session, kchan);
1839 }
1840
1841 if (ret != LTTCOMM_OK) {
1842 goto error;
1843 }
1844
1845 kernel_wait_quiescent(kernel_tracer_fd);
1846 break;
1847 }
1848 case LTTNG_DOMAIN_UST_PID:
1849 {
56fff090
DG
1850 int sock;
1851 struct ltt_ust_channel *uchan;
44d3bd01 1852 struct ltt_ust_session *usess;
56fff090 1853 struct ust_app *app;
44d3bd01
DG
1854
1855 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
1856 domain->attr.pid);
1857 if (usess == NULL) {
1858 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
1859 goto error;
1860 }
1861
56fff090 1862 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
1863 if (app == NULL) {
1864 ret = LTTCOMM_APP_NOT_FOUND;
1865 goto error;
1866 }
56fff090 1867 sock = app->sock;
44d3bd01
DG
1868
1869 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1870 if (uchan == NULL) {
56fff090 1871 ret = channel_ust_create(usess, attr, sock);
44d3bd01 1872 } else {
56fff090 1873 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG
1874 }
1875
1876 if (ret != LTTCOMM_OK) {
1877 goto error;
1878 }
1879
56fff090
DG
1880 ret = copy_ust_channel_to_app(usess, attr, app);
1881 if (ret != LTTCOMM_OK) {
44d3bd01
DG
1882 goto error;
1883 }
1884
44d3bd01
DG
1885 DBG("UST channel %s created for app sock %d with pid %d",
1886 attr->name, app->sock, domain->attr.pid);
1887 break;
1888 }
1889 default:
1890 ret = LTTCOMM_UNKNOWN_DOMAIN;
1891 goto error;
54d01ffb
DG
1892 }
1893
1894 ret = LTTCOMM_OK;
1895
1896error:
1897 return ret;
1898}
1899
1900/*
1901 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1902 */
1903static int cmd_disable_event(struct ltt_session *session, int domain,
1904 char *channel_name, char *event_name)
1905{
1906 int ret;
1907 struct ltt_kernel_channel *kchan;
1908
1909 switch (domain) {
1910 case LTTNG_DOMAIN_KERNEL:
1911 kchan = trace_kernel_get_channel_by_name(channel_name,
1912 session->kernel_session);
1913 if (kchan == NULL) {
1914 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1915 goto error;
d65106b1
DG
1916 }
1917
7a3d1328 1918 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG
1919 if (ret != LTTCOMM_OK) {
1920 goto error;
1921 }
1922
1923 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 1924 break;
54d01ffb
DG
1925 default:
1926 /* TODO: Userspace tracing */
1927 ret = LTTCOMM_NOT_IMPLEMENTED;
1928 goto error;
d65106b1 1929 }
26cc6b4e 1930
54d01ffb
DG
1931 ret = LTTCOMM_OK;
1932
1933error:
1934 return ret;
1935}
1936
1937/*
1938 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1939 */
1940static int cmd_disable_event_all(struct ltt_session *session, int domain,
1941 char *channel_name)
1942{
1943 int ret;
1944 struct ltt_kernel_channel *kchan;
1945
1946 switch (domain) {
1947 case LTTNG_DOMAIN_KERNEL:
1948 kchan = trace_kernel_get_channel_by_name(channel_name,
1949 session->kernel_session);
1950 if (kchan == NULL) {
1951 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1952 goto error;
26cc6b4e
DG
1953 }
1954
54d01ffb
DG
1955 ret = event_kernel_disable_all(session->kernel_session, kchan);
1956 if (ret != LTTCOMM_OK) {
0b97ec54 1957 goto error;
26cc6b4e
DG
1958 }
1959
54d01ffb 1960 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 1961 break;
54d01ffb
DG
1962 default:
1963 /* TODO: Userspace tracing */
1964 ret = LTTCOMM_NOT_IMPLEMENTED;
1965 goto error;
26cc6b4e 1966 }
e953ef25 1967
54d01ffb 1968 ret = LTTCOMM_OK;
e953ef25 1969
54d01ffb
DG
1970error:
1971 return ret;
1972}
f5177a38 1973
54d01ffb
DG
1974/*
1975 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1976 */
1977static int cmd_add_context(struct ltt_session *session, int domain,
1978 char *channel_name, char *event_name, struct lttng_event_context *ctx)
1979{
1980 int ret;
f5177a38 1981
54d01ffb
DG
1982 switch (domain) {
1983 case LTTNG_DOMAIN_KERNEL:
1984 /* Add kernel context to kernel tracer */
1985 ret = context_kernel_add(session->kernel_session, ctx,
1986 event_name, channel_name);
1987 if (ret != LTTCOMM_OK) {
f5177a38 1988 goto error;
e953ef25
DG
1989 }
1990
e953ef25 1991 break;
54d01ffb
DG
1992 default:
1993 /* TODO: Userspace tracing */
1994 ret = LTTCOMM_NOT_IMPLEMENTED;
1995 goto error;
e953ef25 1996 }
950131af 1997
54d01ffb 1998 ret = LTTCOMM_OK;
950131af 1999
54d01ffb
DG
2000error:
2001 return ret;
2002}
2003
2004/*
2005 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2006 */
2007static int cmd_enable_event(struct ltt_session *session, int domain,
2008 char *channel_name, struct lttng_event *event)
2009{
2010 int ret;
2011 struct ltt_kernel_channel *kchan;
2012
2013 switch (domain) {
2014 case LTTNG_DOMAIN_KERNEL:
2015 kchan = trace_kernel_get_channel_by_name(channel_name,
2016 session->kernel_session);
2017 if (kchan == NULL) {
2018 /* This call will notify the kernel thread */
44d3bd01 2019 ret = channel_kernel_create(session->kernel_session,
54d01ffb
DG
2020 NULL, kernel_poll_pipe[1]);
2021 if (ret != LTTCOMM_OK) {
f5177a38
DG
2022 goto error;
2023 }
54d01ffb 2024 }
950131af 2025
54d01ffb
DG
2026 /* Get the newly created kernel channel pointer */
2027 kchan = trace_kernel_get_channel_by_name(channel_name,
2028 session->kernel_session);
2029 if (kchan == NULL) {
2030 /* This sould not happen... */
2031 ret = LTTCOMM_FATAL;
2032 goto error;
2033 }
f5177a38 2034
7a3d1328 2035 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, event);
54d01ffb 2036 if (ret != LTTCOMM_OK) {
f5177a38 2037 goto error;
950131af
DG
2038 }
2039
54d01ffb 2040 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2041 break;
54d01ffb
DG
2042 default:
2043 /* TODO: Userspace tracing */
2044 ret = LTTCOMM_NOT_IMPLEMENTED;
2045 goto error;
950131af 2046 }
d36b8583 2047
54d01ffb 2048 ret = LTTCOMM_OK;
d36b8583 2049
54d01ffb
DG
2050error:
2051 return ret;
2052}
7d29a247 2053
54d01ffb
DG
2054/*
2055 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2056 */
2057static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2058 char *channel_name, int event_type)
54d01ffb
DG
2059{
2060 int ret;
2061 struct ltt_kernel_channel *kchan;
7d29a247 2062
54d01ffb
DG
2063 switch (domain) {
2064 case LTTNG_DOMAIN_KERNEL:
2065 kchan = trace_kernel_get_channel_by_name(channel_name,
2066 session->kernel_session);
2067 if (kchan == NULL) {
2068 /* This call will notify the kernel thread */
44d3bd01
DG
2069 ret = channel_kernel_create(session->kernel_session, NULL,
2070 kernel_poll_pipe[1]);
54d01ffb
DG
2071 if (ret != LTTCOMM_OK) {
2072 goto error;
d36b8583 2073 }
54d01ffb 2074 }
0d0c377a 2075
54d01ffb
DG
2076 /* Get the newly created kernel channel pointer */
2077 kchan = trace_kernel_get_channel_by_name(channel_name,
2078 session->kernel_session);
2079 if (kchan == NULL) {
2080 /* This sould not happen... */
2081 ret = LTTCOMM_FATAL;
2082 goto error;
2083 }
0fdd1e2c 2084
7a3d1328
MD
2085 switch (event_type) {
2086 case LTTNG_KERNEL_SYSCALL:
2087 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2088 kchan, kernel_tracer_fd);
7a3d1328
MD
2089 break;
2090 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2091 /*
7a3d1328
MD
2092 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2093 * events already registered to the channel.
8c9ae521 2094 */
7a3d1328
MD
2095 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2096 kchan, kernel_tracer_fd);
2097 break;
2098 case LTTNG_KERNEL_ALL:
2099 /* Enable syscalls and tracepoints */
8c9ae521
DG
2100 ret = event_kernel_enable_all(session->kernel_session,
2101 kchan, kernel_tracer_fd);
7a3d1328
MD
2102 break;
2103 default:
2104 ret = LTTCOMM_KERN_ENABLE_FAIL;
2105 goto error;
8c9ae521 2106 }
54d01ffb 2107 if (ret != LTTCOMM_OK) {
0d0c377a 2108 goto error;
d36b8583
DG
2109 }
2110
54d01ffb 2111 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2112 break;
54d01ffb
DG
2113 default:
2114 /* TODO: Userspace tracing */
2115 ret = LTTCOMM_NOT_IMPLEMENTED;
2116 goto error;
d36b8583 2117 }
f3ed775e 2118
54d01ffb
DG
2119 ret = LTTCOMM_OK;
2120
2121error:
2122 return ret;
2123}
2124
2125/*
2126 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2127 */
2128static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2129{
2130 int ret;
2131 ssize_t nb_events = 0;
2132
2133 switch (domain) {
2134 case LTTNG_DOMAIN_KERNEL:
2135 nb_events = kernel_list_events(kernel_tracer_fd, events);
2136 if (nb_events < 0) {
2137 ret = LTTCOMM_KERN_LIST_FAIL;
2138 goto error;
894be886 2139 }
54d01ffb
DG
2140 break;
2141 default:
2142 /* TODO: Userspace listing */
2143 ret = LTTCOMM_NOT_IMPLEMENTED;
2144 goto error;
2145 }
894be886 2146
54d01ffb 2147 return nb_events;
7d29a247 2148
54d01ffb
DG
2149error:
2150 /* Return negative value to differentiate return code */
2151 return -ret;
2152}
b389abbe 2153
54d01ffb
DG
2154/*
2155 * Command LTTNG_START_TRACE processed by the client thread.
2156 */
2157static int cmd_start_trace(struct ltt_session *session)
2158{
2159 int ret;
2160 struct ltt_kernel_channel *kchan;
2161 struct ltt_kernel_session *ksession;
b389abbe 2162
54d01ffb
DG
2163 /* Short cut */
2164 ksession = session->kernel_session;
5eb91c98 2165
54d01ffb
DG
2166 /* Kernel tracing */
2167 if (ksession != NULL) {
2168 /* Open kernel metadata */
2169 if (ksession->metadata == NULL) {
2170 ret = kernel_open_metadata(ksession, ksession->trace_path);
2171 if (ret < 0) {
2172 ret = LTTCOMM_KERN_META_FAIL;
2173 goto error;
b389abbe 2174 }
54d01ffb 2175 }
7d29a247 2176
54d01ffb
DG
2177 /* Open kernel metadata stream */
2178 if (ksession->metadata_stream_fd == 0) {
2179 ret = kernel_open_metadata_stream(ksession);
2180 if (ret < 0) {
2181 ERR("Kernel create metadata stream failed");
2182 ret = LTTCOMM_KERN_STREAM_FAIL;
2183 goto error;
2184 }
2185 }
2186
2187 /* For each channel */
2188 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2189 if (kchan->stream_count == 0) {
2190 ret = kernel_open_channel_stream(kchan);
2191 if (ret < 0) {
2192 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2193 goto error;
2194 }
54d01ffb
DG
2195 /* Update the stream global counter */
2196 ksession->stream_count_global += ret;
7d29a247 2197 }
54d01ffb
DG
2198 }
2199
2200 /* Setup kernel consumer socket and send fds to it */
2201 ret = init_kernel_tracing(ksession);
2202 if (ret < 0) {
2203 ret = LTTCOMM_KERN_START_FAIL;
2204 goto error;
2205 }
2206
2207 /* This start the kernel tracing */
2208 ret = kernel_start_session(ksession);
2209 if (ret < 0) {
2210 ret = LTTCOMM_KERN_START_FAIL;
2211 goto error;
2212 }
2213
2214 /* Quiescent wait after starting trace */
2215 kernel_wait_quiescent(kernel_tracer_fd);
2216 }
2217
2218 /* TODO: Start all UST traces */
2219
2220 ret = LTTCOMM_OK;
2221
2222error:
2223 return ret;
2224}
2225
2226/*
2227 * Command LTTNG_STOP_TRACE processed by the client thread.
2228 */
2229static int cmd_stop_trace(struct ltt_session *session)
2230{
2231 int ret;
2232 struct ltt_kernel_channel *kchan;
2233 struct ltt_kernel_session *ksession;
2234
2235 /* Short cut */
2236 ksession = session->kernel_session;
2237
2238 /* Kernel tracer */
2239 if (ksession != NULL) {
2240 DBG("Stop kernel tracing");
2241
2242 /* Flush all buffers before stopping */
2243 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2244 if (ret < 0) {
2245 ERR("Kernel metadata flush failed");
2246 }
f34daff7 2247
54d01ffb
DG
2248 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2249 ret = kernel_flush_buffer(kchan);
0d0c377a 2250 if (ret < 0) {
54d01ffb 2251 ERR("Kernel flush buffer error");
7d29a247 2252 }
54d01ffb 2253 }
19e70852 2254
54d01ffb
DG
2255 ret = kernel_stop_session(ksession);
2256 if (ret < 0) {
2257 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2258 goto error;
f3ed775e 2259 }
54d01ffb
DG
2260
2261 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2262 }
54d01ffb
DG
2263
2264 /* TODO : User-space tracer */
2265
2266 ret = LTTCOMM_OK;
2267
2268error:
2269 return ret;
2270}
2271
2272/*
2273 * Command LTTNG_CREATE_SESSION processed by the client thread.
2274 */
2275static int cmd_create_session(char *name, char *path)
2276{
2277 int ret;
2278
2279 ret = session_create(name, path);
2280 if (ret != LTTCOMM_OK) {
2281 goto error;
2282 }
2283
2284 ret = LTTCOMM_OK;
2285
2286error:
2287 return ret;
2288}
2289
2290/*
2291 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2292 */
2293static int cmd_destroy_session(struct ltt_session *session, char *name)
2294{
2295 int ret;
2296
2297 /* Clean kernel session teardown */
2298 teardown_kernel_session(session);
2299
2300 /*
2301 * Must notify the kernel thread here to update it's poll setin order
2302 * to remove the channel(s)' fd just destroyed.
2303 */
2304 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2305 if (ret < 0) {
2306 perror("write kernel poll pipe");
2307 }
2308
2309 ret = session_destroy(name);
2310
2311 return ret;
2312}
2313
2314/*
2315 * Command LTTNG_CALIBRATE processed by the client thread.
2316 */
2317static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2318{
2319 int ret;
2320
2321 switch (domain) {
2322 case LTTNG_DOMAIN_KERNEL:
33a2b854 2323 {
54d01ffb 2324 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2325
54d01ffb
DG
2326 kcalibrate.type = calibrate->type;
2327 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2328 if (ret < 0) {
54d01ffb
DG
2329 ret = LTTCOMM_KERN_ENABLE_FAIL;
2330 goto error;
33a2b854 2331 }
54d01ffb
DG
2332 break;
2333 }
2334 default:
2335 /* TODO: Userspace tracing */
2336 ret = LTTCOMM_NOT_IMPLEMENTED;
2337 goto error;
2338 }
33a2b854 2339
54d01ffb 2340 ret = LTTCOMM_OK;
33a2b854 2341
54d01ffb
DG
2342error:
2343 return ret;
2344}
7d29a247 2345
54d01ffb
DG
2346/*
2347 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2348 */
2349static int cmd_register_consumer(struct ltt_session *session, int domain,
2350 char *sock_path)
2351{
2352 int ret, sock;
b389abbe 2353
54d01ffb
DG
2354 switch (domain) {
2355 case LTTNG_DOMAIN_KERNEL:
2356 /* Can't register a consumer if there is already one */
2357 if (session->kernel_session->consumer_fd != 0) {
2358 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2359 goto error;
2360 }
2361
2362 sock = lttcomm_connect_unix_sock(sock_path);
2363 if (sock < 0) {
2364 ret = LTTCOMM_CONNECT_FAIL;
2365 goto error;
2366 }
2367
2368 session->kernel_session->consumer_fd = sock;
2369 break;
2370 default:
2371 /* TODO: Userspace tracing */
2372 ret = LTTCOMM_NOT_IMPLEMENTED;
2373 goto error;
2374 }
2375
2376 ret = LTTCOMM_OK;
2377
2378error:
2379 return ret;
2380}
2381
2382/*
2383 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2384 */
2385static ssize_t cmd_list_domains(struct ltt_session *session,
2386 struct lttng_domain **domains)
2387{
2388 int ret;
2389 ssize_t nb_dom = 0;
2390
2391 if (session->kernel_session != NULL) {
2392 nb_dom++;
2393 }
2394
2395 nb_dom += session->ust_session_list.count;
2396
2397 *domains = malloc(nb_dom * sizeof(struct lttng_domain));
2398 if (*domains == NULL) {
2399 ret = -LTTCOMM_FATAL;
2400 goto error;
2401 }
2402
2403 (*domains)[0].type = LTTNG_DOMAIN_KERNEL;
2404
2405 /* TODO: User-space tracer domain support */
2406
2407 return nb_dom;
2408
2409error:
2410 return ret;
2411}
2412
2413/*
2414 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2415 */
2416static ssize_t cmd_list_channels(struct ltt_session *session,
2417 struct lttng_channel **channels)
2418{
2419 int ret;
2420 ssize_t nb_chan = 0;
2421
2422 if (session->kernel_session != NULL) {
2423 nb_chan += session->kernel_session->channel_count;
2424 }
2425
2426 *channels = malloc(nb_chan * sizeof(struct lttng_channel));
2427 if (*channels == NULL) {
2428 ret = -LTTCOMM_FATAL;
2429 goto error;
2430 }
2431
2432 list_lttng_channels(session, *channels);
2433
2434 return nb_chan;
2435
2436error:
2437 return ret;
2438}
2439
2440/*
2441 * Command LTTNG_LIST_EVENTS processed by the client thread.
2442 */
2443static ssize_t cmd_list_events(struct ltt_session *session,
2444 char *channel_name, struct lttng_event **events)
2445{
2446 int ret;
2447 ssize_t nb_event = 0;
2448 struct ltt_kernel_channel *kchan = NULL;
2449
2450 if (session->kernel_session != NULL) {
2451 kchan = trace_kernel_get_channel_by_name(channel_name,
2452 session->kernel_session);
2453 if (kchan == NULL) {
2454 ret = -LTTCOMM_KERN_CHAN_NOT_FOUND;
2455 goto error;
2456 }
2457 nb_event += kchan->event_count;
2458 }
2459
2460 *events = malloc(nb_event * sizeof(struct lttng_event));
2461 if (*events == NULL) {
2462 ret = -LTTCOMM_FATAL;
2463 goto error;
2464 }
2465
2466 list_lttng_events(kchan, *events);
2467
2468 /* TODO: User-space tracer support */
2469
2470 return nb_event;
2471
2472error:
2473 return ret;
2474}
2475
2476/*
2477 * Process the command requested by the lttng client within the command
2478 * context structure. This function make sure that the return structure (llm)
2479 * is set and ready for transmission before returning.
2480 *
2481 * Return any error encountered or 0 for success.
2482 */
2483static int process_client_msg(struct command_ctx *cmd_ctx)
2484{
2485 int ret = LTTCOMM_OK;
44d3bd01 2486 int need_tracing_session = 1;
54d01ffb
DG
2487
2488 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2489
2490 /*
2491 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2492 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2493 * command.
2494 */
2495 switch(cmd_ctx->lsm->cmd_type) {
2496 case LTTNG_LIST_SESSIONS:
2497 case LTTNG_LIST_TRACEPOINTS:
2498 case LTTNG_LIST_DOMAINS:
2499 case LTTNG_LIST_CHANNELS:
2500 case LTTNG_LIST_EVENTS:
2501 break;
2502 default:
2503 /* Setup lttng message with no payload */
2504 ret = setup_lttng_msg(cmd_ctx, 0);
2505 if (ret < 0) {
2506 /* This label does not try to unlock the session */
2507 goto init_setup_error;
2508 }
2509 }
2510
2511 /* Commands that DO NOT need a session. */
2512 switch (cmd_ctx->lsm->cmd_type) {
2513 case LTTNG_CALIBRATE:
2514 case LTTNG_CREATE_SESSION:
2515 case LTTNG_LIST_SESSIONS:
2516 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2517 need_tracing_session = 0;
54d01ffb
DG
2518 break;
2519 default:
2520 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
2521 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2522 if (cmd_ctx->session == NULL) {
2523 if (cmd_ctx->lsm->session.name != NULL) {
2524 ret = LTTCOMM_SESS_NOT_FOUND;
2525 } else {
2526 /* If no session name specified */
2527 ret = LTTCOMM_SELECT_SESS;
2528 }
2529 goto error;
2530 } else {
2531 /* Acquire lock for the session */
2532 session_lock(cmd_ctx->session);
2533 }
2534 break;
2535 }
b389abbe 2536
54d01ffb
DG
2537 /*
2538 * Check domain type for specific "pre-action".
2539 */
2540 switch (cmd_ctx->lsm->domain.type) {
2541 case LTTNG_DOMAIN_KERNEL:
2542 /* Kernel tracer check */
2543 if (kernel_tracer_fd == 0) {
2544 /* Basically, load kernel tracer modules */
2545 init_kernel_tracer();
2546 if (kernel_tracer_fd == 0) {
2547 ret = LTTCOMM_KERN_NA;
2548 goto error;
2549 }
2550 }
5eb91c98 2551
54d01ffb 2552 /* Need a session for kernel command */
44d3bd01 2553 if (need_tracing_session) {
54d01ffb
DG
2554 if (cmd_ctx->session->kernel_session == NULL) {
2555 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2556 if (ret < 0) {
54d01ffb 2557 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2558 goto error;
2559 }
b389abbe 2560 }
7d29a247 2561
54d01ffb
DG
2562 /* Start the kernel consumer daemon */
2563 if (kconsumerd_pid == 0 &&
2564 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2565 ret = start_kconsumerd();
7d29a247 2566 if (ret < 0) {
54d01ffb
DG
2567 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2568 goto error;
950131af 2569 }
33a2b854 2570 }
0d0c377a 2571 }
54d01ffb 2572 break;
44d3bd01
DG
2573 case LTTNG_DOMAIN_UST_PID:
2574 {
2575 struct ltt_ust_session *usess;
2576
2577 if (need_tracing_session) {
2578 usess = trace_ust_get_session_by_pid(
2579 &cmd_ctx->session->ust_session_list,
2580 cmd_ctx->lsm->domain.attr.pid);
2581 if (usess == NULL) {
2582 ret = create_ust_session(cmd_ctx->session,
2583 &cmd_ctx->lsm->domain);
2584 if (ret != LTTCOMM_OK) {
2585 goto error;
2586 }
2587 }
2588 }
2589 break;
2590 }
54d01ffb
DG
2591 default:
2592 /* TODO Userspace tracer */
2593 break;
2594 }
33a2b854 2595
54d01ffb
DG
2596 /* Process by command type */
2597 switch (cmd_ctx->lsm->cmd_type) {
2598 case LTTNG_ADD_CONTEXT:
2599 {
2600 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2601 cmd_ctx->lsm->u.context.channel_name,
2602 cmd_ctx->lsm->u.context.event_name,
2603 &cmd_ctx->lsm->u.context.ctx);
2604 break;
2605 }
2606 case LTTNG_DISABLE_CHANNEL:
2607 {
2608 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2609 cmd_ctx->lsm->u.disable.channel_name);
2610 break;
2611 }
2612 case LTTNG_DISABLE_EVENT:
2613 {
2614 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2615 cmd_ctx->lsm->u.disable.channel_name,
2616 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2617 ret = LTTCOMM_OK;
2618 break;
2619 }
54d01ffb
DG
2620 case LTTNG_DISABLE_ALL_EVENT:
2621 {
2622 DBG("Disabling all kernel event");
2623
2624 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2625 cmd_ctx->lsm->u.disable.channel_name);
2626 break;
2627 }
2628 case LTTNG_ENABLE_CHANNEL:
2629 {
44d3bd01 2630 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG
2631 &cmd_ctx->lsm->u.channel.chan);
2632 break;
2633 }
2634 case LTTNG_ENABLE_EVENT:
2635 {
2636 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2637 cmd_ctx->lsm->u.enable.channel_name,
2638 &cmd_ctx->lsm->u.enable.event);
2639 break;
2640 }
2641 case LTTNG_ENABLE_ALL_EVENT:
2642 {
2643 DBG("Enabling all kernel event");
2644
2645 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
2646 cmd_ctx->lsm->u.enable.channel_name,
2647 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
2648 break;
2649 }
052da939 2650 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2651 {
9f19cc17 2652 struct lttng_event *events;
54d01ffb 2653 ssize_t nb_events;
052da939 2654
54d01ffb
DG
2655 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2656 if (nb_events < 0) {
2657 ret = -nb_events;
2658 goto error;
2ef84c95
DG
2659 }
2660
2661 /*
2662 * Setup lttng message with payload size set to the event list size in
2663 * bytes and then copy list into the llm payload.
2664 */
052da939 2665 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2666 if (ret < 0) {
052da939 2667 free(events);
2ef84c95
DG
2668 goto setup_error;
2669 }
2670
2671 /* Copy event list into message payload */
9f19cc17 2672 memcpy(cmd_ctx->llm->payload, events,
052da939 2673 sizeof(struct lttng_event) * nb_events);
2ef84c95 2674
9f19cc17 2675 free(events);
2ef84c95
DG
2676
2677 ret = LTTCOMM_OK;
2678 break;
2679 }
f3ed775e 2680 case LTTNG_START_TRACE:
8c0faa1d 2681 {
54d01ffb 2682 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2683 break;
2684 }
f3ed775e 2685 case LTTNG_STOP_TRACE:
8c0faa1d 2686 {
54d01ffb 2687 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2688 break;
2689 }
5e16da05
MD
2690 case LTTNG_CREATE_SESSION:
2691 {
54d01ffb
DG
2692 ret = cmd_create_session(cmd_ctx->lsm->session.name,
2693 cmd_ctx->lsm->session.path);
5e16da05
MD
2694 break;
2695 }
2696 case LTTNG_DESTROY_SESSION:
2697 {
54d01ffb
DG
2698 ret = cmd_destroy_session(cmd_ctx->session,
2699 cmd_ctx->lsm->session.name);
5461b305 2700 break;
5e16da05 2701 }
9f19cc17 2702 case LTTNG_LIST_DOMAINS:
5e16da05 2703 {
54d01ffb
DG
2704 ssize_t nb_dom;
2705 struct lttng_domain *domains;
5461b305 2706
54d01ffb
DG
2707 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2708 if (nb_dom < 0) {
2709 ret = -nb_dom;
2710 goto error;
ce3d728c 2711 }
520ff687 2712
54d01ffb 2713 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
2714 if (ret < 0) {
2715 goto setup_error;
520ff687 2716 }
57167058 2717
54d01ffb
DG
2718 /* Copy event list into message payload */
2719 memcpy(cmd_ctx->llm->payload, domains,
2720 nb_dom * sizeof(struct lttng_domain));
2721
2722 free(domains);
5e16da05 2723
5461b305 2724 ret = LTTCOMM_OK;
5e16da05
MD
2725 break;
2726 }
9f19cc17 2727 case LTTNG_LIST_CHANNELS:
5e16da05 2728 {
54d01ffb
DG
2729 size_t nb_chan;
2730 struct lttng_channel *channels;
2731
2732 nb_chan = cmd_list_channels(cmd_ctx->session, &channels);
2733 if (nb_chan < 0) {
2734 ret = -nb_chan;
2735 goto error;
5461b305 2736 }
ca95a216 2737
54d01ffb 2738 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
2739 if (ret < 0) {
2740 goto setup_error;
2741 }
9f19cc17 2742
54d01ffb
DG
2743 /* Copy event list into message payload */
2744 memcpy(cmd_ctx->llm->payload, channels,
2745 nb_chan * sizeof(struct lttng_channel));
2746
2747 free(channels);
9f19cc17
DG
2748
2749 ret = LTTCOMM_OK;
5461b305 2750 break;
5e16da05 2751 }
9f19cc17 2752 case LTTNG_LIST_EVENTS:
5e16da05 2753 {
54d01ffb 2754 size_t nb_event;
684d34d2 2755 struct lttng_event *events = NULL;
9f19cc17 2756
54d01ffb
DG
2757 nb_event = cmd_list_events(cmd_ctx->session,
2758 cmd_ctx->lsm->u.list.channel_name, &events);
2759 if (nb_event < 0) {
2760 ret = -nb_event;
2761 goto error;
5461b305 2762 }
ca95a216 2763
54d01ffb 2764 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
2765 if (ret < 0) {
2766 goto setup_error;
2767 }
9f19cc17 2768
54d01ffb
DG
2769 /* Copy event list into message payload */
2770 memcpy(cmd_ctx->llm->payload, events,
2771 nb_event * sizeof(struct lttng_event));
9f19cc17 2772
54d01ffb 2773 free(events);
9f19cc17
DG
2774
2775 ret = LTTCOMM_OK;
5461b305 2776 break;
5e16da05
MD
2777 }
2778 case LTTNG_LIST_SESSIONS:
2779 {
54d01ffb 2780 session_lock_list();
5461b305 2781
6c9cc2ab 2782 if (session_list_ptr->count == 0) {
f3ed775e 2783 ret = LTTCOMM_NO_SESSION;
54d01ffb 2784 session_unlock_list();
5461b305 2785 goto error;
57167058 2786 }
5e16da05 2787
6c9cc2ab
DG
2788 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
2789 session_list_ptr->count);
5461b305 2790 if (ret < 0) {
54d01ffb 2791 session_unlock_list();
5461b305 2792 goto setup_error;
e065084a 2793 }
5e16da05 2794
6c9cc2ab
DG
2795 /* Filled the session array */
2796 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
2797
54d01ffb 2798 session_unlock_list();
5e16da05 2799
5461b305 2800 ret = LTTCOMM_OK;
5e16da05
MD
2801 break;
2802 }
d0254c7c
MD
2803 case LTTNG_CALIBRATE:
2804 {
54d01ffb
DG
2805 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
2806 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
2807 break;
2808 }
d9800920
DG
2809 case LTTNG_REGISTER_CONSUMER:
2810 {
54d01ffb
DG
2811 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2812 cmd_ctx->lsm->u.reg.path);
d9800920
DG
2813 break;
2814 }
5e16da05 2815 default:
5e16da05 2816 ret = LTTCOMM_UND;
5461b305 2817 break;
fac6795d
DG
2818 }
2819
5461b305 2820error:
5461b305
DG
2821 if (cmd_ctx->llm == NULL) {
2822 DBG("Missing llm structure. Allocating one.");
894be886 2823 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
2824 goto setup_error;
2825 }
2826 }
54d01ffb 2827 /* Set return code */
5461b305 2828 cmd_ctx->llm->ret_code = ret;
5461b305 2829setup_error:
b5541356 2830 if (cmd_ctx->session) {
54d01ffb 2831 session_unlock(cmd_ctx->session);
b5541356 2832 }
54d01ffb 2833init_setup_error:
8028d920 2834 return ret;
fac6795d
DG
2835}
2836
1d4b027a 2837/*
d063d709
DG
2838 * This thread manage all clients request using the unix client socket for
2839 * communication.
1d4b027a
DG
2840 */
2841static void *thread_manage_clients(void *data)
2842{
5eb91c98
DG
2843 int sock = 0, ret, i, pollfd;
2844 uint32_t revents, nb_fd;
273ea72c 2845 struct command_ctx *cmd_ctx = NULL;
5eb91c98 2846 struct lttng_poll_event events;
1d4b027a
DG
2847
2848 DBG("[thread] Manage client started");
2849
2850 ret = lttcomm_listen_unix_sock(client_sock);
2851 if (ret < 0) {
2852 goto error;
2853 }
2854
5eb91c98
DG
2855 /*
2856 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2857 * more will be added to this poll set.
2858 */
2859 ret = create_thread_poll_set(&events, 2);
2860 if (ret < 0) {
2861 goto error;
2862 }
273ea72c 2863
5eb91c98
DG
2864 /* Add the application registration socket */
2865 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2866 if (ret < 0) {
2867 goto error;
2868 }
273ea72c 2869
bbd973c2
DG
2870 /*
2871 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
2872 */
2873 if (opt_sig_parent) {
2874 kill(ppid, SIGCHLD);
2875 }
2876
2877 while (1) {
1d4b027a 2878 DBG("Accepting client command ...");
273ea72c 2879
5eb91c98
DG
2880 nb_fd = LTTNG_POLL_GETNB(&events);
2881
273ea72c 2882 /* Inifinite blocking call, waiting for transmission */
5eb91c98 2883 ret = lttng_poll_wait(&events, -1);
273ea72c 2884 if (ret < 0) {
273ea72c
DG
2885 goto error;
2886 }
2887
5eb91c98
DG
2888 for (i = 0; i < nb_fd; i++) {
2889 /* Fetch once the poll data */
2890 revents = LTTNG_POLL_GETEV(&events, i);
2891 pollfd = LTTNG_POLL_GETFD(&events, i);
2892
2893 /* Thread quit pipe has been closed. Killing thread. */
2894 ret = check_thread_quit_pipe(pollfd, revents);
2895 if (ret) {
2896 goto error;
2897 }
2898
2899 /* Event on the registration socket */
2900 if (pollfd == client_sock) {
2901 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2902 ERR("Client socket poll error");
2903 goto error;
2904 }
2905 }
2906 }
2907
2908 DBG("Wait for client response");
2909
2910 sock = lttcomm_accept_unix_sock(client_sock);
2911 if (sock < 0) {
273ea72c 2912 goto error;
273ea72c
DG
2913 }
2914
5eb91c98
DG
2915 /* Allocate context command to process the client request */
2916 cmd_ctx = malloc(sizeof(struct command_ctx));
2917 if (cmd_ctx == NULL) {
2918 perror("malloc cmd_ctx");
1d4b027a 2919 goto error;
5eb91c98 2920 }
1d4b027a 2921
5eb91c98
DG
2922 /* Allocate data buffer for reception */
2923 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
2924 if (cmd_ctx->lsm == NULL) {
2925 perror("malloc cmd_ctx->lsm");
2926 goto error;
2927 }
1d4b027a 2928
5eb91c98
DG
2929 cmd_ctx->llm = NULL;
2930 cmd_ctx->session = NULL;
1d4b027a 2931
5eb91c98
DG
2932 /*
2933 * Data is received from the lttng client. The struct
2934 * lttcomm_session_msg (lsm) contains the command and data request of
2935 * the client.
2936 */
2937 DBG("Receiving data from client ...");
2938 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
2939 sizeof(struct lttcomm_session_msg));
2940 if (ret <= 0) {
2941 DBG("Nothing recv() from client... continuing");
2942 close(sock);
2943 free(cmd_ctx);
2944 continue;
2945 }
1d4b027a 2946
5eb91c98
DG
2947 // TODO: Validate cmd_ctx including sanity check for
2948 // security purpose.
f7776ea7 2949
5eb91c98
DG
2950 /*
2951 * This function dispatch the work to the kernel or userspace tracer
2952 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2953 * informations for the client. The command context struct contains
2954 * everything this function may needs.
2955 */
2956 ret = process_client_msg(cmd_ctx);
2957 if (ret < 0) {
bbd973c2 2958 /*
5eb91c98
DG
2959 * TODO: Inform client somehow of the fatal error. At
2960 * this point, ret < 0 means that a malloc failed
2961 * (ENOMEM). Error detected but still accept command.
bbd973c2 2962 */
bbd973c2 2963 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
2964 continue;
2965 }
d6e4fca4 2966
54d01ffb
DG
2967 DBG("Sending response (size: %d, retcode: %s)",
2968 cmd_ctx->lttng_msg_size,
532d79a7 2969 lttng_get_readable_code(-cmd_ctx->llm->ret_code));
54d01ffb 2970 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
2971 if (ret < 0) {
2972 ERR("Failed to send data back to client");
bbd973c2 2973 }
1d4b027a 2974
5eb91c98
DG
2975 clean_command_ctx(&cmd_ctx);
2976
2977 /* End of transmission */
273ea72c
DG
2978 close(sock);
2979 }
2980
5eb91c98
DG
2981error:
2982 DBG("Client thread dying");
273ea72c 2983 unlink(client_unix_sock_path);
5eb91c98
DG
2984 close(client_sock);
2985 close(sock);
273ea72c 2986
5eb91c98 2987 lttng_poll_clean(&events);
a2fb29a5 2988 clean_command_ctx(&cmd_ctx);
1d4b027a
DG
2989 return NULL;
2990}
2991
2992
fac6795d
DG
2993/*
2994 * usage function on stderr
2995 */
2996static void usage(void)
2997{
b716ce68 2998 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
2999 fprintf(stderr, " -h, --help Display this usage.\n");
3000 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3001 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3002 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3003 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3004 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3005 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3006 fprintf(stderr, " -V, --version Show version number.\n");
3007 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3008 fprintf(stderr, " -q, --quiet No output at all.\n");
3009 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
31f73cc9 3010 fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
fac6795d
DG
3011}
3012
3013/*
3014 * daemon argument parsing
3015 */
3016static int parse_args(int argc, char **argv)
3017{
3018 int c;
3019
3020 static struct option long_options[] = {
3021 { "client-sock", 1, 0, 'c' },
3022 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
3023 { "kconsumerd-cmd-sock", 1, 0, 0 },
3024 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 3025 { "daemonize", 0, 0, 'd' },
5b8719f5 3026 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
3027 { "help", 0, 0, 'h' },
3028 { "group", 1, 0, 'g' },
3029 { "version", 0, 0, 'V' },
75462a81 3030 { "quiet", 0, 0, 'q' },
3f9947db 3031 { "verbose", 0, 0, 'v' },
31f73cc9 3032 { "verbose-kconsumerd", 0, 0, 'Z' },
fac6795d
DG
3033 { NULL, 0, 0, 0 }
3034 };
3035
3036 while (1) {
3037 int option_index = 0;
54d01ffb
DG
3038 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z",
3039 long_options, &option_index);
fac6795d
DG
3040 if (c == -1) {
3041 break;
3042 }
3043
3044 switch (c) {
3045 case 0:
3046 fprintf(stderr, "option %s", long_options[option_index].name);
3047 if (optarg) {
3048 fprintf(stderr, " with arg %s\n", optarg);
3049 }
3050 break;
b716ce68 3051 case 'c':
fac6795d
DG
3052 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3053 break;
3054 case 'a':
3055 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3056 break;
3057 case 'd':
3058 opt_daemon = 1;
3059 break;
3060 case 'g':
3061 opt_tracing_group = strdup(optarg);
3062 break;
3063 case 'h':
3064 usage();
3065 exit(EXIT_FAILURE);
3066 case 'V':
3067 fprintf(stdout, "%s\n", VERSION);
3068 exit(EXIT_SUCCESS);
5b8719f5
DG
3069 case 'S':
3070 opt_sig_parent = 1;
3071 break;
d6f42150
DG
3072 case 'E':
3073 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
3074 break;
3075 case 'C':
3076 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3077 break;
75462a81
DG
3078 case 'q':
3079 opt_quiet = 1;
3080 break;
3f9947db 3081 case 'v':
53086306
DG
3082 /* Verbose level can increase using multiple -v */
3083 opt_verbose += 1;
3f9947db 3084 break;
31f73cc9
MD
3085 case 'Z':
3086 opt_verbose_kconsumerd += 1;
3087 break;
fac6795d
DG
3088 default:
3089 /* Unknown option or other error.
3090 * Error is printed by getopt, just return */
3091 return -1;
3092 }
3093 }
3094
3095 return 0;
3096}
3097
3098/*
d063d709 3099 * Creates the two needed socket by the daemon.
d6f42150
DG
3100 * apps_sock - The communication socket for all UST apps.
3101 * client_sock - The communication of the cli tool (lttng).
fac6795d 3102 */
cf3af59e 3103static int init_daemon_socket(void)
fac6795d
DG
3104{
3105 int ret = 0;
3106 mode_t old_umask;
3107
3108 old_umask = umask(0);
3109
3110 /* Create client tool unix socket */
d6f42150
DG
3111 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3112 if (client_sock < 0) {
3113 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
3114 ret = -1;
3115 goto end;
3116 }
3117
3118 /* File permission MUST be 660 */
3119 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3120 if (ret < 0) {
d6f42150 3121 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
3122 perror("chmod");
3123 goto end;
3124 }
3125
3126 /* Create the application unix socket */
d6f42150
DG
3127 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3128 if (apps_sock < 0) {
3129 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
3130 ret = -1;
3131 goto end;
3132 }
3133
d6f42150 3134 /* File permission MUST be 666 */
54d01ffb
DG
3135 ret = chmod(apps_unix_sock_path,
3136 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3137 if (ret < 0) {
d6f42150 3138 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
3139 perror("chmod");
3140 goto end;
3141 }
3142
3143end:
3144 umask(old_umask);
3145 return ret;
3146}
3147
3148/*
54d01ffb
DG
3149 * Check if the global socket is available, and if a daemon is answering at the
3150 * other side. If yes, error is returned.
fac6795d 3151 */
cf3af59e 3152static int check_existing_daemon(void)
fac6795d 3153{
7d8234d9 3154 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3155 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3156 return 0;
099e26bd 3157 }
54d01ffb 3158
7d8234d9 3159 /* Is there anybody out there ? */
099e26bd 3160 if (lttng_session_daemon_alive()) {
7d8234d9 3161 return -EEXIST;
099e26bd 3162 } else {
7d8234d9 3163 return 0;
099e26bd 3164 }
fac6795d
DG
3165}
3166
fac6795d 3167/*
d063d709 3168 * Set the tracing group gid onto the client socket.
5e16da05 3169 *
d063d709
DG
3170 * Race window between mkdir and chown is OK because we are going from more
3171 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3172 */
d6f42150 3173static int set_permissions(void)
fac6795d
DG
3174{
3175 int ret;
996b65c8 3176 gid_t gid;
fac6795d 3177
996b65c8
MD
3178 gid = allowed_group();
3179 if (gid < 0) {
a463f419
DG
3180 if (is_root) {
3181 WARN("No tracing group detected");
3182 ret = 0;
3183 } else {
3184 ERR("Missing tracing group. Aborting execution.");
3185 ret = -1;
3186 }
fac6795d
DG
3187 goto end;
3188 }
3189
d6f42150 3190 /* Set lttng run dir */
996b65c8 3191 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG
3192 if (ret < 0) {
3193 ERR("Unable to set group on " LTTNG_RUNDIR);
3194 perror("chown");
3195 }
3196
3197 /* lttng client socket path */
996b65c8 3198 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3199 if (ret < 0) {
d6f42150
DG
3200 ERR("Unable to set group on %s", client_unix_sock_path);
3201 perror("chown");
3202 }
3203
3204 /* kconsumerd error socket path */
996b65c8 3205 ret = chown(kconsumerd_err_unix_sock_path, 0, gid);
d6f42150
DG
3206 if (ret < 0) {
3207 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
3208 perror("chown");
3209 }
3210
d6f42150 3211 DBG("All permissions are set");
e07ae692 3212
fac6795d
DG
3213end:
3214 return ret;
3215}
3216
7a485870 3217/*
d063d709 3218 * Create the pipe used to wake up the kernel thread.
7a485870
DG
3219 */
3220static int create_kernel_poll_pipe(void)
3221{
3222 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3223}
3224
099e26bd
DG
3225/*
3226 * Create the application command pipe to wake thread_manage_apps.
3227 */
3228static int create_apps_cmd_pipe(void)
3229{
3230 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3231}
3232
d6f42150 3233/*
d063d709 3234 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG
3235 */
3236static int create_lttng_rundir(void)
3237{
3238 int ret;
3239
3240 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
3241 if (ret < 0) {
b1f11e69
DG
3242 if (errno != EEXIST) {
3243 ERR("Unable to create " LTTNG_RUNDIR);
3244 goto error;
3245 } else {
3246 ret = 0;
3247 }
d6f42150
DG
3248 }
3249
3250error:
3251 return ret;
3252}
3253
3254/*
d063d709
DG
3255 * Setup sockets and directory needed by the kconsumerd communication with the
3256 * session daemon.
d6f42150
DG
3257 */
3258static int set_kconsumerd_sockets(void)
3259{
3260 int ret;
3261
3262 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
54d01ffb
DG
3263 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX,
3264 KCONSUMERD_ERR_SOCK_PATH);
d6f42150
DG
3265 }
3266
3267 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
54d01ffb
DG
3268 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX,
3269 KCONSUMERD_CMD_SOCK_PATH);
d6f42150
DG
3270 }
3271
3272 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
3273 if (ret < 0) {
6beb2242
DG
3274 if (errno != EEXIST) {
3275 ERR("Failed to create " KCONSUMERD_PATH);
3276 goto error;
3277 }
3278 ret = 0;
d6f42150
DG
3279 }
3280
3281 /* Create the kconsumerd error unix socket */
54d01ffb
DG
3282 kconsumerd_err_sock =
3283 lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
d6f42150
DG
3284 if (kconsumerd_err_sock < 0) {
3285 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
3286 ret = -1;
3287 goto error;
3288 }
3289
3290 /* File permission MUST be 660 */
54d01ffb
DG
3291 ret = chmod(kconsumerd_err_unix_sock_path,
3292 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150
DG
3293 if (ret < 0) {
3294 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
3295 perror("chmod");
3296 goto error;
3297 }
3298
3299error:
3300 return ret;
3301}
3302
fac6795d 3303/*
d063d709 3304 * Signal handler for the daemon
cf3af59e 3305 *
54d01ffb
DG
3306 * Simply stop all worker threads, leaving main() return gracefully after
3307 * joining all threads and calling cleanup().
fac6795d
DG
3308 */
3309static void sighandler(int sig)
3310{
3311 switch (sig) {
cf3af59e
MD
3312 case SIGPIPE:
3313 DBG("SIGPIPE catched");
3314 return;
3315 case SIGINT:
3316 DBG("SIGINT catched");
3317 stop_threads();
3318 break;
3319 case SIGTERM:
3320 DBG("SIGTERM catched");
3321 stop_threads();
3322 break;
3323 default:
3324 break;
fac6795d 3325 }
fac6795d
DG
3326}
3327
3328/*
d063d709 3329 * Setup signal handler for :
1d4b027a 3330 * SIGINT, SIGTERM, SIGPIPE
fac6795d 3331 */
1d4b027a 3332static int set_signal_handler(void)
fac6795d 3333{
1d4b027a
DG
3334 int ret = 0;
3335 struct sigaction sa;
3336 sigset_t sigset;
fac6795d 3337
1d4b027a
DG
3338 if ((ret = sigemptyset(&sigset)) < 0) {
3339 perror("sigemptyset");
3340 return ret;
3341 }
d6f42150 3342
1d4b027a
DG
3343 sa.sa_handler = sighandler;
3344 sa.sa_mask = sigset;
3345 sa.sa_flags = 0;
3346 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
3347 perror("sigaction");
3348 return ret;
d6f42150
DG
3349 }
3350
1d4b027a
DG
3351 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
3352 perror("sigaction");
3353 return ret;
d6f42150 3354 }
aaf26714 3355
1d4b027a
DG
3356 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3357 perror("sigaction");
3358 return ret;
8c0faa1d
DG
3359 }
3360
1d4b027a
DG
3361 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3362
3363 return ret;
fac6795d
DG
3364}
3365
f3ed775e 3366/*
d063d709
DG
3367 * Set open files limit to unlimited. This daemon can open a large number of
3368 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
3369 */
3370static void set_ulimit(void)
3371{
3372 int ret;
3373 struct rlimit lim;
3374
a88df331 3375 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
3376 lim.rlim_cur = 65535;
3377 lim.rlim_max = 65535;
3378
3379 ret = setrlimit(RLIMIT_NOFILE, &lim);
3380 if (ret < 0) {
3381 perror("failed to set open files limit");
3382 }
3383}
3384
fac6795d
DG
3385/*
3386 * main
3387 */
3388int main(int argc, char **argv)
3389{
fac6795d
DG
3390 int ret = 0;
3391 void *status;
b082db07 3392 const char *home_path;
fac6795d 3393
273ea72c 3394 /* Create thread quit pipe */
cf3af59e
MD
3395 if ((ret = init_thread_quit_pipe()) < 0) {
3396 goto error;
273ea72c
DG
3397 }
3398
fac6795d
DG
3399 /* Parse arguments */
3400 progname = argv[0];
3401 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 3402 goto error;
fac6795d
DG
3403 }
3404
3405 /* Daemonize */
3406 if (opt_daemon) {
53094c05
DG
3407 ret = daemon(0, 0);
3408 if (ret < 0) {
3409 perror("daemon");
cf3af59e 3410 goto error;
53094c05 3411 }
fac6795d
DG
3412 }
3413
3414 /* Check if daemon is UID = 0 */
3415 is_root = !getuid();
3416
fac6795d 3417 if (is_root) {
d6f42150
DG
3418 ret = create_lttng_rundir();
3419 if (ret < 0) {
cf3af59e 3420 goto error;
d6f42150
DG
3421 }
3422
fac6795d 3423 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
3424 snprintf(apps_unix_sock_path, PATH_MAX,
3425 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
3426 }
3427
3428 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
3429 snprintf(client_unix_sock_path, PATH_MAX,
3430 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
3431 }
0fdd1e2c
DG
3432
3433 /* Set global SHM for ust */
3434 if (strlen(wait_shm_path) == 0) {
3435 snprintf(wait_shm_path, PATH_MAX,
3436 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
3437 }