Cleanup ust-app.c and make it more modular
[lttng-tools.git] / lttng-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 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
20fe2104 53#include "kernel-ctl.h"
32258573 54#include "lttng-sessiond.h"
0fdd1e2c 55#include "shm.h"
56fff090 56#include "ust-app.h"
1e307fab 57#include "ust-ctl.h"
8e68d1c8 58#include "utils.h"
fac6795d 59
3bd1e081
MD
60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 80const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG
89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d
DG
92static int opt_daemon;
93static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 94static pid_t ppid; /* Parent PID for --sig-parent option */
3bd1e081
MD
95
96/* Consumer daemon specific control data */
97static struct consumer_data kconsumer_data = {
98 .type = LTTNG_CONSUMER_KERNEL,
99};
100static struct consumer_data ustconsumer_data = {
101 .type = LTTNG_CONSUMER_UST,
102};
103
099e26bd 104static int dispatch_thread_exit;
fac6795d 105
54d01ffb
DG
106/* Global application Unix socket path */
107static char apps_unix_sock_path[PATH_MAX];
108/* Global client Unix socket path */
109static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
110/* global wait shm path for UST */
111static char wait_shm_path[PATH_MAX];
fac6795d 112
1d4b027a 113/* Sockets and FDs */
d6f42150
DG
114static int client_sock;
115static int apps_sock;
20fe2104 116static int kernel_tracer_fd;
7a485870 117static int kernel_poll_pipe[2];
1d4b027a 118
273ea72c
DG
119/*
120 * Quit pipe for all threads. This permits a single cancellation point
121 * for all threads when receiving an event on the pipe.
122 */
123static int thread_quit_pipe[2];
124
099e26bd
DG
125/*
126 * This pipe is used to inform the thread managing application communication
127 * that a command is queued and ready to be processed.
128 */
129static int apps_cmd_pipe[2];
130
1d4b027a 131/* Pthread, Mutexes and Semaphores */
1d4b027a 132static pthread_t apps_thread;
099e26bd 133static pthread_t reg_apps_thread;
1d4b027a 134static pthread_t client_thread;
7a485870 135static pthread_t kernel_thread;
099e26bd 136static pthread_t dispatch_thread;
5eb91c98 137
fac6795d 138
099e26bd
DG
139/*
140 * UST registration command queue. This queue is tied with a futex and uses a N
141 * wakers / 1 waiter implemented and detailed in futex.c/.h
142 *
143 * The thread_manage_apps and thread_dispatch_ust_registration interact with
144 * this queue and the wait/wake scheme.
145 */
146static struct ust_cmd_queue ust_cmd_queue;
147
b5541356
DG
148/*
149 * Pointer initialized before thread creation.
150 *
151 * This points to the tracing session list containing the session count and a
152 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
153 * MUST NOT be taken if you call a public function in session.c.
04ea676f 154 *
d063d709 155 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 156 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
157 */
158static struct ltt_session_list *session_list_ptr;
159
5eb91c98
DG
160/*
161 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
162 */
163static int create_thread_poll_set(struct lttng_poll_event *events,
164 unsigned int size)
165{
166 int ret;
167
168 if (events == NULL || size == 0) {
169 ret = -1;
170 goto error;
171 }
172
173 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
174 if (ret < 0) {
175 goto error;
176 }
177
178 /* Add quit pipe */
179 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
180 if (ret < 0) {
181 goto error;
182 }
183
184 return 0;
185
186error:
187 return ret;
188}
189
190/*
191 * Check if the thread quit pipe was triggered.
192 *
193 * Return 1 if it was triggered else 0;
194 */
195static int check_thread_quit_pipe(int fd, uint32_t events)
196{
197 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
198 return 1;
199 }
200
201 return 0;
202}
203
0fdd1e2c
DG
204/*
205 * Remove modules in reverse load order.
206 */
207static int modprobe_remove_kernel_modules(void)
208{
209 int ret = 0, i;
210 char modprobe[256];
211
212 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
213 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 214 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
215 kernel_modules_list[i].name);
216 if (ret < 0) {
24b487b8 217 perror("snprintf modprobe -r");
0fdd1e2c
DG
218 goto error;
219 }
220 modprobe[sizeof(modprobe) - 1] = '\0';
221 ret = system(modprobe);
222 if (ret == -1) {
24b487b8 223 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
224 kernel_modules_list[i].name);
225 } else if (kernel_modules_list[i].required
226 && WEXITSTATUS(ret) != 0) {
227 ERR("Unable to remove module %s",
228 kernel_modules_list[i].name);
229 } else {
230 DBG("Modprobe removal successful %s",
231 kernel_modules_list[i].name);
232 }
233 }
234
235error:
236 return ret;
237}
238
239/*
240 * Return group ID of the tracing group or -1 if not found.
241 */
996b65c8
MD
242static gid_t allowed_group(void)
243{
244 struct group *grp;
245
274e143b
MD
246 if (opt_tracing_group) {
247 grp = getgrnam(opt_tracing_group);
248 } else {
249 grp = getgrnam(default_tracing_group);
250 }
996b65c8
MD
251 if (!grp) {
252 return -1;
253 } else {
254 return grp->gr_gid;
255 }
256}
257
273ea72c 258/*
5eb91c98 259 * Init thread quit pipe.
273ea72c
DG
260 *
261 * Return -1 on error or 0 if all pipes are created.
262 */
263static int init_thread_quit_pipe(void)
264{
265 int ret;
266
267 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
268 if (ret < 0) {
269 perror("thread quit pipe");
270 goto error;
271 }
272
273error:
274 return ret;
275}
276
fac6795d 277/*
d063d709
DG
278 * Complete teardown of a kernel session. This free all data structure related
279 * to a kernel session and update counter.
fac6795d 280 */
1d4b027a 281static void teardown_kernel_session(struct ltt_session *session)
fac6795d 282{
1d4b027a
DG
283 if (session->kernel_session != NULL) {
284 DBG("Tearing down kernel session");
d9800920
DG
285
286 /*
287 * If a custom kernel consumer was registered, close the socket before
288 * tearing down the complete kernel session structure
289 */
3bd1e081 290 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
d9800920
DG
291 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
292 }
293
62499ad6 294 trace_kernel_destroy_session(session->kernel_session);
1d4b027a
DG
295 /* Extra precaution */
296 session->kernel_session = NULL;
fac6795d 297 }
fac6795d
DG
298}
299
f6a9efaa
DG
300/*
301 * Complete teardown of all UST sessions. This will free everything on his path
302 * and destroy the core essence of all ust sessions :)
303 */
304static void teardown_ust_session(struct ltt_session *session)
305{
306 DBG("Tearing down UST session(s)");
307
308 trace_ust_destroy_session(session->ust_session);
309}
310
099e26bd
DG
311/*
312 * Stop all threads by closing the thread quit pipe.
313 */
cf3af59e
MD
314static void stop_threads(void)
315{
5eb91c98
DG
316 int ret;
317
cf3af59e
MD
318 /* Stopping all threads */
319 DBG("Terminating all threads");
54d01ffb 320 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
321 if (ret < 0) {
322 ERR("write error on thread quit pipe");
323 }
324
099e26bd
DG
325 /* Dispatch thread */
326 dispatch_thread_exit = 1;
327 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
328}
329
fac6795d 330/*
d063d709 331 * Cleanup the daemon
fac6795d 332 */
cf3af59e 333static void cleanup(void)
fac6795d 334{
1d4b027a
DG
335 int ret;
336 char *cmd;
af9737e9 337 struct ltt_session *sess, *stmp;
fac6795d 338
1d4b027a 339 DBG("Cleaning up");
e07ae692 340
5eb91c98
DG
341 if (is_root) {
342 DBG("Removing %s directory", LTTNG_RUNDIR);
343 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
344 if (ret < 0) {
345 ERR("asprintf failed. Something is really wrong!");
346 }
5461b305 347
5eb91c98
DG
348 /* Remove lttng run directory */
349 ret = system(cmd);
350 if (ret < 0) {
351 ERR("Unable to clean " LTTNG_RUNDIR);
352 }
1d4b027a 353 }
5461b305 354
1d4b027a 355 DBG("Cleaning up all session");
fac6795d 356
b5541356 357 /* Destroy session list mutex */
273ea72c
DG
358 if (session_list_ptr != NULL) {
359 pthread_mutex_destroy(&session_list_ptr->lock);
360
361 /* Cleanup ALL session */
54d01ffb
DG
362 cds_list_for_each_entry_safe(sess, stmp,
363 &session_list_ptr->head, list) {
273ea72c 364 teardown_kernel_session(sess);
f6a9efaa
DG
365 teardown_ust_session(sess);
366 free(sess);
273ea72c
DG
367 }
368 }
369
099e26bd 370 DBG("Closing all UST sockets");
56fff090 371 ust_app_clean_list();
099e26bd 372
3bd1e081 373 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 374
f3ed775e 375 DBG("Closing kernel fd");
1d4b027a 376 close(kernel_tracer_fd);
ab147185 377
2f50c8a3
DG
378 if (is_root) {
379 DBG("Unloading kernel modules");
380 modprobe_remove_kernel_modules();
381 }
5eb91c98
DG
382
383 close(thread_quit_pipe[0]);
384 close(thread_quit_pipe[1]);
421cb601
DG
385
386 /* <fun> */
387 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
388 "Matthew, BEET driven development works!%c[%dm",
389 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
390 /* </fun> */
fac6795d
DG
391}
392
e065084a 393/*
d063d709 394 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 395 *
d063d709 396 * Return lttcomm error code.
e065084a
DG
397 */
398static int send_unix_sock(int sock, void *buf, size_t len)
399{
400 /* Check valid length */
401 if (len <= 0) {
402 return -1;
403 }
404
405 return lttcomm_send_unix_sock(sock, buf, len);
406}
407
5461b305 408/*
d063d709 409 * Free memory of a command context structure.
5461b305 410 */
a2fb29a5 411static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 412{
a2fb29a5
DG
413 DBG("Clean command context structure");
414 if (*cmd_ctx) {
415 if ((*cmd_ctx)->llm) {
416 free((*cmd_ctx)->llm);
5461b305 417 }
a2fb29a5
DG
418 if ((*cmd_ctx)->lsm) {
419 free((*cmd_ctx)->lsm);
5461b305 420 }
a2fb29a5
DG
421 free(*cmd_ctx);
422 *cmd_ctx = NULL;
5461b305
DG
423 }
424}
425
f3ed775e 426/*
d063d709 427 * Send all stream fds of kernel channel to the consumer.
f3ed775e 428 */
2bdd86d4 429static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 430 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
431{
432 int ret;
f3ed775e 433 struct ltt_kernel_stream *stream;
3bd1e081 434 struct lttcomm_consumer_msg lkm;
f3ed775e 435
3bd1e081 436 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 437 channel->channel->name);
f3ed775e 438
3bd1e081
MD
439 /* Send channel */
440 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
441 lkm.u.channel.channel_key = channel->fd;
442 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
443 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 444 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 445 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 446 if (ret < 0) {
3bd1e081 447 perror("send consumer channel");
f3ed775e
DG
448 goto error;
449 }
450
3bd1e081 451 /* Send streams */
7a485870 452 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
453 if (!stream->fd) {
454 continue;
455 }
456 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
457 lkm.u.stream.channel_key = channel->fd;
458 lkm.u.stream.stream_key = stream->fd;
459 lkm.u.stream.state = stream->state;
460 lkm.u.stream.output = channel->channel->attr.output;
461 lkm.u.stream.mmap_len = 0; /* for kernel */
462 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
463 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
464 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
465 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
466 if (ret < 0) {
467 perror("send consumer stream");
468 goto error;
469 }
470 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
471 if (ret < 0) {
472 perror("send consumer stream ancillary data");
473 goto error;
f3ed775e
DG
474 }
475 }
476
3bd1e081 477 DBG("consumer channel streams sent");
f3ed775e
DG
478
479 return 0;
480
481error:
482 return ret;
483}
484
485/*
d063d709 486 * Send all stream fds of the kernel session to the consumer.
f3ed775e 487 */
2bdd86d4 488static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 489 struct ltt_kernel_session *session)
f3ed775e
DG
490{
491 int ret;
492 struct ltt_kernel_channel *chan;
3bd1e081
MD
493 struct lttcomm_consumer_msg lkm;
494 int sock = session->consumer_fd;
7a485870
DG
495
496 DBG("Sending metadata stream fd");
497
2bdd86d4 498 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 499 if (session->consumer_fd == 0) {
3bd1e081 500 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
501 }
502
7a485870 503 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
504 /* Send metadata channel fd */
505 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
506 lkm.u.channel.channel_key = session->metadata->fd;
507 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
508 lkm.u.channel.mmap_len = 0; /* for kernel */
509 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
510 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
511 if (ret < 0) {
512 perror("send consumer channel");
513 goto error;
514 }
515
516 /* Send metadata stream fd */
517 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
518 lkm.u.stream.channel_key = session->metadata->fd;
519 lkm.u.stream.stream_key = session->metadata_stream_fd;
520 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
521 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
522 lkm.u.stream.mmap_len = 0; /* for kernel */
523 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
524 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
525 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
526 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
527 if (ret < 0) {
528 perror("send consumer stream");
529 goto error;
530 }
531 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 532 if (ret < 0) {
3bd1e081 533 perror("send consumer stream");
7a485870
DG
534 goto error;
535 }
536 }
f3ed775e 537
f3ed775e 538 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD
539 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
540 if (ret < 0) {
541 goto error;
542 }
543 }
544
545 DBG("consumer fds (metadata and channel streams) sent");
546
547 return 0;
548
549error:
550 return ret;
551}
552
fac6795d 553/*
0fdd1e2c 554 * Notify UST applications using the shm mmap futex.
fac6795d 555 */
0fdd1e2c 556static int notify_ust_apps(int active)
fac6795d 557{
0fdd1e2c 558 char *wait_shm_mmap;
fac6795d 559
0fdd1e2c 560 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 561
0fdd1e2c
DG
562 /* See shm.c for this call implying mmap, shm and futex calls */
563 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
564 if (wait_shm_mmap == NULL) {
fac6795d
DG
565 goto error;
566 }
567
0fdd1e2c
DG
568 /* Wake waiting process */
569 futex_wait_update((int32_t *) wait_shm_mmap, active);
570
571 /* Apps notified successfully */
572 return 0;
fac6795d
DG
573
574error:
0fdd1e2c 575 return -1;
fac6795d
DG
576}
577
e065084a 578/*
d063d709
DG
579 * Setup the outgoing data buffer for the response (llm) by allocating the
580 * right amount of memory and copying the original information from the lsm
581 * structure.
ca95a216 582 *
d063d709 583 * Return total size of the buffer pointed by buf.
ca95a216 584 */
5461b305 585static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 586{
f3ed775e 587 int ret, buf_size;
ca95a216 588
f3ed775e 589 buf_size = size;
5461b305
DG
590
591 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
592 if (cmd_ctx->llm == NULL) {
ca95a216 593 perror("malloc");
5461b305 594 ret = -ENOMEM;
ca95a216
DG
595 goto error;
596 }
597
5461b305
DG
598 /* Copy common data */
599 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 600 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 601
5461b305
DG
602 cmd_ctx->llm->data_size = size;
603 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
604
ca95a216
DG
605 return buf_size;
606
607error:
608 return ret;
609}
610
7a485870 611/*
5eb91c98 612 * Update the kernel poll set of all channel fd available over all tracing
d063d709 613 * session. Add the wakeup pipe at the end of the set.
7a485870 614 */
5eb91c98 615static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 616{
5eb91c98 617 int ret;
7a485870
DG
618 struct ltt_session *session;
619 struct ltt_kernel_channel *channel;
620
5eb91c98 621 DBG("Updating kernel poll set");
7a485870 622
54d01ffb 623 session_lock_list();
b5541356 624 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 625 session_lock(session);
7a485870 626 if (session->kernel_session == NULL) {
54d01ffb 627 session_unlock(session);
7a485870
DG
628 continue;
629 }
7a485870 630
54d01ffb
DG
631 cds_list_for_each_entry(channel,
632 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
633 /* Add channel fd to the kernel poll set */
634 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
635 if (ret < 0) {
54d01ffb 636 session_unlock(session);
5eb91c98
DG
637 goto error;
638 }
639 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 640 }
54d01ffb 641 session_unlock(session);
7a485870 642 }
54d01ffb 643 session_unlock_list();
7a485870 644
5eb91c98 645 return 0;
7a485870
DG
646
647error:
54d01ffb 648 session_unlock_list();
7a485870
DG
649 return -1;
650}
651
652/*
54d01ffb 653 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 654 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 655 *
d063d709 656 * Useful for CPU hotplug feature.
7a485870 657 */
2bdd86d4 658static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
659{
660 int ret = 0;
661 struct ltt_session *session;
662 struct ltt_kernel_channel *channel;
663
664 DBG("Updating kernel streams for channel fd %d", fd);
665
54d01ffb 666 session_lock_list();
b5541356 667 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 668 session_lock(session);
7a485870 669 if (session->kernel_session == NULL) {
54d01ffb 670 session_unlock(session);
7a485870
DG
671 continue;
672 }
d9800920
DG
673
674 /* This is not suppose to be 0 but this is an extra security check */
675 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 676 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
677 }
678
5eb91c98
DG
679 cds_list_for_each_entry(channel,
680 &session->kernel_session->channel_list.head, list) {
7a485870
DG
681 if (channel->fd == fd) {
682 DBG("Channel found, updating kernel streams");
683 ret = kernel_open_channel_stream(channel);
684 if (ret < 0) {
b3c750d2 685 goto error;
7a485870 686 }
d9800920 687
7a485870 688 /*
5eb91c98
DG
689 * Have we already sent fds to the consumer? If yes, it means
690 * that tracing is started so it is safe to send our updated
691 * stream fds.
7a485870 692 */
3bd1e081 693 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 694 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 695 session->kernel_session->consumer_fd, channel);
7a485870 696 if (ret < 0) {
b3c750d2 697 goto error;
7a485870
DG
698 }
699 }
b3c750d2 700 goto error;
7a485870
DG
701 }
702 }
54d01ffb 703 session_unlock(session);
7a485870 704 }
54d01ffb 705 session_unlock_list();
b3c750d2 706 return ret;
7a485870 707
b3c750d2 708error:
54d01ffb
DG
709 session_unlock(session);
710 session_unlock_list();
7a485870
DG
711 return ret;
712}
713
487cf67c
DG
714/*
715 * For each tracing session, update newly registered apps.
716 */
717static void update_ust_app(int app_sock)
718{
719 struct ltt_session *sess, *stmp;
720
721 /* For all tracing session(s) */
722 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG
723 if (sess->ust_session) {
724 ust_app_global_update(sess->ust_session, app_sock);
725 }
487cf67c
DG
726 }
727}
728
7a485870 729/*
d063d709 730 * This thread manage event coming from the kernel.
7a485870 731 *
d063d709
DG
732 * Features supported in this thread:
733 * -) CPU Hotplug
7a485870
DG
734 */
735static void *thread_manage_kernel(void *data)
736{
5eb91c98
DG
737 int ret, i, pollfd, update_poll_flag = 1;
738 uint32_t revents, nb_fd;
7a485870 739 char tmp;
5eb91c98 740 struct lttng_poll_event events;
7a485870
DG
741
742 DBG("Thread manage kernel started");
743
5eb91c98
DG
744 ret = create_thread_poll_set(&events, 2);
745 if (ret < 0) {
746 goto error;
747 }
748
749 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
750 if (ret < 0) {
751 goto error;
752 }
753
7a485870
DG
754 while (1) {
755 if (update_poll_flag == 1) {
5f822d0a
DG
756 /*
757 * Reset number of fd in the poll set. Always 2 since there is the thread
758 * quit pipe and the kernel pipe.
759 */
760 events.nb_fd = 2;
761
5eb91c98
DG
762 ret = update_kernel_poll(&events);
763 if (ret < 0) {
7a485870
DG
764 goto error;
765 }
766 update_poll_flag = 0;
767 }
768
5eb91c98
DG
769 nb_fd = LTTNG_POLL_GETNB(&events);
770
771 DBG("Thread kernel polling on %d fds", nb_fd);
772
773 /* Zeroed the poll events */
774 lttng_poll_reset(&events);
7a485870
DG
775
776 /* Poll infinite value of time */
5eb91c98 777 ret = lttng_poll_wait(&events, -1);
7a485870 778 if (ret < 0) {
7a485870
DG
779 goto error;
780 } else if (ret == 0) {
781 /* Should not happen since timeout is infinite */
85611738
DG
782 ERR("Return value of poll is 0 with an infinite timeout.\n"
783 "This should not have happened! Continuing...");
7a485870
DG
784 continue;
785 }
786
5eb91c98
DG
787 for (i = 0; i < nb_fd; i++) {
788 /* Fetch once the poll data */
789 revents = LTTNG_POLL_GETEV(&events, i);
790 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 791
5eb91c98
DG
792 /* Thread quit pipe has been closed. Killing thread. */
793 ret = check_thread_quit_pipe(pollfd, revents);
794 if (ret) {
795 goto error;
796 }
7a485870 797
5eb91c98
DG
798 /* Check for data on kernel pipe */
799 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
800 ret = read(kernel_poll_pipe[0], &tmp, 1);
801 update_poll_flag = 1;
802 continue;
803 } else {
804 /*
805 * New CPU detected by the kernel. Adding kernel stream to
806 * kernel session and updating the kernel consumer
807 */
808 if (revents & LPOLLIN) {
2bdd86d4 809 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
810 if (ret < 0) {
811 continue;
812 }
813 break;
814 /*
815 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
816 * and unregister kernel stream at this point.
817 */
7a485870 818 }
7a485870
DG
819 }
820 }
821 }
822
823error:
824 DBG("Kernel thread dying");
273ea72c
DG
825 close(kernel_poll_pipe[0]);
826 close(kernel_poll_pipe[1]);
5eb91c98
DG
827
828 lttng_poll_clean(&events);
829
7a485870
DG
830 return NULL;
831}
832
1d4b027a 833/*
3bd1e081 834 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 835 */
3bd1e081 836static void *thread_manage_consumer(void *data)
1d4b027a 837{
5eb91c98
DG
838 int sock = 0, i, ret, pollfd;
839 uint32_t revents, nb_fd;
1d4b027a 840 enum lttcomm_return_code code;
5eb91c98 841 struct lttng_poll_event events;
3bd1e081 842 struct consumer_data *consumer_data = data;
1d4b027a 843
3bd1e081 844 DBG("[thread] Manage consumer started");
1d4b027a 845
3bd1e081 846 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
847 if (ret < 0) {
848 goto error;
849 }
850
5eb91c98
DG
851 /*
852 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
853 * Nothing more will be added to this poll set.
854 */
855 ret = create_thread_poll_set(&events, 2);
856 if (ret < 0) {
857 goto error;
858 }
273ea72c 859
3bd1e081 860 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
861 if (ret < 0) {
862 goto error;
863 }
864
865 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
866
867 /* Inifinite blocking call, waiting for transmission */
5eb91c98 868 ret = lttng_poll_wait(&events, -1);
273ea72c 869 if (ret < 0) {
273ea72c
DG
870 goto error;
871 }
872
5eb91c98
DG
873 for (i = 0; i < nb_fd; i++) {
874 /* Fetch once the poll data */
875 revents = LTTNG_POLL_GETEV(&events, i);
876 pollfd = LTTNG_POLL_GETFD(&events, i);
877
878 /* Thread quit pipe has been closed. Killing thread. */
879 ret = check_thread_quit_pipe(pollfd, revents);
880 if (ret) {
881 goto error;
882 }
883
884 /* Event on the registration socket */
3bd1e081 885 if (pollfd == consumer_data->err_sock) {
5eb91c98 886 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 887 ERR("consumer err socket poll error");
5eb91c98
DG
888 goto error;
889 }
890 }
273ea72c
DG
891 }
892
3bd1e081 893 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
894 if (sock < 0) {
895 goto error;
896 }
897
3bd1e081 898 DBG2("Receiving code from consumer err_sock");
ee0b0061 899
712ea556 900 /* Getting status code from kconsumerd */
54d01ffb
DG
901 ret = lttcomm_recv_unix_sock(sock, &code,
902 sizeof(enum lttcomm_return_code));
1d4b027a
DG
903 if (ret <= 0) {
904 goto error;
905 }
906
3bd1e081
MD
907 if (code == CONSUMERD_COMMAND_SOCK_READY) {
908 consumer_data->cmd_sock =
909 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
910 if (consumer_data->cmd_sock < 0) {
911 sem_post(&consumer_data->sem);
48842b30 912 PERROR("consumer connect");
1d4b027a
DG
913 goto error;
914 }
915 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
916 sem_post(&consumer_data->sem);
917 DBG("consumer command socket ready");
1d4b027a 918 } else {
3bd1e081 919 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
920 lttcomm_get_readable_code(-code));
921 goto error;
922 }
923
54d01ffb 924 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 925 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 926 if (ret < 0) {
72079cae
DG
927 goto error;
928 }
929
5eb91c98
DG
930 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
931 if (ret < 0) {
72079cae 932 goto error;
5eb91c98
DG
933 }
934
935 /* Update number of fd */
936 nb_fd = LTTNG_POLL_GETNB(&events);
937
938 /* Inifinite blocking call, waiting for transmission */
939 ret = lttng_poll_wait(&events, -1);
940 if (ret < 0) {
72079cae
DG
941 goto error;
942 }
943
5eb91c98
DG
944 for (i = 0; i < nb_fd; i++) {
945 /* Fetch once the poll data */
946 revents = LTTNG_POLL_GETEV(&events, i);
947 pollfd = LTTNG_POLL_GETFD(&events, i);
948
949 /* Thread quit pipe has been closed. Killing thread. */
950 ret = check_thread_quit_pipe(pollfd, revents);
951 if (ret) {
952 goto error;
953 }
954
955 /* Event on the kconsumerd socket */
956 if (pollfd == sock) {
957 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 958 ERR("consumer err socket second poll error");
5eb91c98
DG
959 goto error;
960 }
961 }
962 }
963
712ea556 964 /* Wait for any kconsumerd error */
54d01ffb
DG
965 ret = lttcomm_recv_unix_sock(sock, &code,
966 sizeof(enum lttcomm_return_code));
712ea556 967 if (ret <= 0) {
3bd1e081 968 ERR("consumer closed the command socket");
712ea556 969 goto error;
6f61d021 970 }
1d4b027a 971
3bd1e081 972 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 973
1d4b027a 974error:
3bd1e081
MD
975 DBG("consumer thread dying");
976 close(consumer_data->err_sock);
977 close(consumer_data->cmd_sock);
5eb91c98 978 close(sock);
273ea72c 979
3bd1e081
MD
980 unlink(consumer_data->err_unix_sock_path);
981 unlink(consumer_data->cmd_unix_sock_path);
982 consumer_data->pid = 0;
1d4b027a 983
5eb91c98 984 lttng_poll_clean(&events);
0177d773 985
5eb91c98 986 return NULL;
099e26bd
DG
987}
988
099e26bd
DG
989/*
990 * This thread manage application communication.
1d4b027a
DG
991 */
992static void *thread_manage_apps(void *data)
099e26bd 993{
5eb91c98
DG
994 int i, ret, pollfd;
995 uint32_t revents, nb_fd;
099e26bd 996 struct ust_command ust_cmd;
5eb91c98 997 struct lttng_poll_event events;
099e26bd
DG
998
999 DBG("[thread] Manage application started");
1000
f6a9efaa
DG
1001 rcu_register_thread();
1002 rcu_thread_online();
1003
5eb91c98
DG
1004 ret = create_thread_poll_set(&events, 2);
1005 if (ret < 0) {
1006 goto error;
1007 }
099e26bd 1008
5eb91c98
DG
1009 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1010 if (ret < 0) {
1011 goto error;
1012 }
099e26bd 1013
5eb91c98
DG
1014 while (1) {
1015 /* Zeroed the events structure */
1016 lttng_poll_reset(&events);
0177d773 1017
5eb91c98 1018 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1019
1020 DBG("Apps thread polling on %d fds", nb_fd);
1021
1022 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1023 ret = lttng_poll_wait(&events, -1);
099e26bd 1024 if (ret < 0) {
099e26bd
DG
1025 goto error;
1026 }
1027
5eb91c98
DG
1028 for (i = 0; i < nb_fd; i++) {
1029 /* Fetch once the poll data */
1030 revents = LTTNG_POLL_GETEV(&events, i);
1031 pollfd = LTTNG_POLL_GETFD(&events, i);
1032
1033 /* Thread quit pipe has been closed. Killing thread. */
1034 ret = check_thread_quit_pipe(pollfd, revents);
1035 if (ret) {
099e26bd 1036 goto error;
5eb91c98 1037 }
099e26bd 1038
5eb91c98
DG
1039 /* Inspect the apps cmd pipe */
1040 if (pollfd == apps_cmd_pipe[0]) {
1041 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1042 ERR("Apps command pipe error");
0177d773 1043 goto error;
5eb91c98
DG
1044 } else if (revents & LPOLLIN) {
1045 /* Empty pipe */
1046 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1047 if (ret < 0 || ret < sizeof(ust_cmd)) {
1048 perror("read apps cmd pipe");
1049 goto error;
1050 }
099e26bd 1051
5eb91c98 1052 /* Register applicaton to the session daemon */
56fff090 1053 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1054 ust_cmd.sock);
5eb91c98
DG
1055 if (ret < 0) {
1056 /* Only critical ENOMEM error can be returned here */
1057 goto error;
1058 }
1059
1060 ret = ustctl_register_done(ust_cmd.sock);
1061 if (ret < 0) {
1062 /*
1063 * If the registration is not possible, we simply
1064 * unregister the apps and continue
1065 */
56fff090 1066 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1067 } else {
1068 /*
1069 * We just need here to monitor the close of the UST
1070 * socket and poll set monitor those by default.
1071 */
1072 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1073 if (ret < 0) {
1074 goto error;
1075 }
1076
54d01ffb
DG
1077 DBG("Apps with sock %d added to poll set",
1078 ust_cmd.sock);
5eb91c98 1079 }
487cf67c
DG
1080
1081 /*
1082 * Add channel(s) and event(s) to newly registered apps
1083 * from lttng global UST domain.
1084 */
1085 update_ust_app(ust_cmd.sock);
5eb91c98 1086 break;
0177d773 1087 }
5eb91c98
DG
1088 } else {
1089 /*
54d01ffb
DG
1090 * At this point, we know that a registered application made
1091 * the event at poll_wait.
5eb91c98
DG
1092 */
1093 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1094 /* Removing from the poll set */
1095 ret = lttng_poll_del(&events, pollfd);
1096 if (ret < 0) {
1097 goto error;
1098 }
099e26bd 1099
5eb91c98 1100 /* Socket closed */
56fff090 1101 ust_app_unregister(pollfd);
5eb91c98
DG
1102 break;
1103 }
099e26bd
DG
1104 }
1105 }
099e26bd
DG
1106 }
1107
1108error:
1109 DBG("Application communication apps dying");
1110 close(apps_cmd_pipe[0]);
1111 close(apps_cmd_pipe[1]);
1112
5eb91c98 1113 lttng_poll_clean(&events);
099e26bd 1114
f6a9efaa
DG
1115 rcu_thread_offline();
1116 rcu_unregister_thread();
099e26bd
DG
1117 return NULL;
1118}
1119
1120/*
1121 * Dispatch request from the registration threads to the application
1122 * communication thread.
1123 */
1124static void *thread_dispatch_ust_registration(void *data)
1125{
1126 int ret;
1127 struct cds_wfq_node *node;
1128 struct ust_command *ust_cmd = NULL;
1129
1130 DBG("[thread] Dispatch UST command started");
1131
1132 while (!dispatch_thread_exit) {
1133 /* Atomically prepare the queue futex */
1134 futex_nto1_prepare(&ust_cmd_queue.futex);
1135
1136 do {
1137 /* Dequeue command for registration */
1138 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1139 if (node == NULL) {
00a17c97 1140 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1141 /* Continue thread execution */
1142 break;
1143 }
1144
1145 ust_cmd = caa_container_of(node, struct ust_command, node);
1146
2f50c8a3
DG
1147 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1148 " gid:%d sock:%d name:%s (version %d.%d)",
1149 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1150 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1151 ust_cmd->sock, ust_cmd->reg_msg.name,
1152 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1153 /*
1154 * Inform apps thread of the new application registration. This
1155 * call is blocking so we can be assured that the data will be read
1156 * at some point in time or wait to the end of the world :)
1157 */
1158 ret = write(apps_cmd_pipe[1], ust_cmd,
1159 sizeof(struct ust_command));
1160 if (ret < 0) {
1161 perror("write apps cmd pipe");
1162 if (errno == EBADF) {
1163 /*
1164 * We can't inform the application thread to process
1165 * registration. We will exit or else application
1166 * registration will not occur and tracing will never
1167 * start.
1168 */
1169 goto error;
1170 }
1171 }
1172 free(ust_cmd);
1173 } while (node != NULL);
1174
1175 /* Futex wait on queue. Blocking call on futex() */
1176 futex_nto1_wait(&ust_cmd_queue.futex);
1177 }
1178
1179error:
1180 DBG("Dispatch thread dying");
1181 return NULL;
1182}
1183
1184/*
1185 * This thread manage application registration.
1186 */
1187static void *thread_registration_apps(void *data)
1d4b027a 1188{
5eb91c98
DG
1189 int sock = 0, i, ret, pollfd;
1190 uint32_t revents, nb_fd;
1191 struct lttng_poll_event events;
099e26bd
DG
1192 /*
1193 * Get allocated in this thread, enqueued to a global queue, dequeued and
1194 * freed in the manage apps thread.
1195 */
1196 struct ust_command *ust_cmd = NULL;
1d4b027a 1197
099e26bd 1198 DBG("[thread] Manage application registration started");
1d4b027a
DG
1199
1200 ret = lttcomm_listen_unix_sock(apps_sock);
1201 if (ret < 0) {
1202 goto error;
1203 }
1204
5eb91c98
DG
1205 /*
1206 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1207 * more will be added to this poll set.
1208 */
1209 ret = create_thread_poll_set(&events, 2);
1210 if (ret < 0) {
1211 goto error;
1212 }
273ea72c 1213
5eb91c98
DG
1214 /* Add the application registration socket */
1215 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1216 if (ret < 0) {
1217 goto error;
1218 }
273ea72c 1219
1d4b027a 1220 /* Notify all applications to register */
0fdd1e2c
DG
1221 ret = notify_ust_apps(1);
1222 if (ret < 0) {
1223 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1224 "Execution continues but there might be problem for already\n"
1225 "running applications that wishes to register.");
0fdd1e2c 1226 }
1d4b027a
DG
1227
1228 while (1) {
1229 DBG("Accepting application registration");
273ea72c 1230
5eb91c98
DG
1231 nb_fd = LTTNG_POLL_GETNB(&events);
1232
273ea72c 1233 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1234 ret = lttng_poll_wait(&events, -1);
273ea72c 1235 if (ret < 0) {
273ea72c
DG
1236 goto error;
1237 }
1238
5eb91c98
DG
1239 for (i = 0; i < nb_fd; i++) {
1240 /* Fetch once the poll data */
1241 revents = LTTNG_POLL_GETEV(&events, i);
1242 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1243
5eb91c98
DG
1244 /* Thread quit pipe has been closed. Killing thread. */
1245 ret = check_thread_quit_pipe(pollfd, revents);
1246 if (ret) {
90014c57
DG
1247 goto error;
1248 }
1d4b027a 1249
5eb91c98
DG
1250 /* Event on the registration socket */
1251 if (pollfd == apps_sock) {
1252 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1253 ERR("Register apps socket poll error");
1254 goto error;
1255 } else if (revents & LPOLLIN) {
1256 sock = lttcomm_accept_unix_sock(apps_sock);
1257 if (sock < 0) {
1258 goto error;
1259 }
099e26bd 1260
5eb91c98
DG
1261 /* Create UST registration command for enqueuing */
1262 ust_cmd = malloc(sizeof(struct ust_command));
1263 if (ust_cmd == NULL) {
1264 perror("ust command malloc");
1265 goto error;
1266 }
1d4b027a 1267
5eb91c98
DG
1268 /*
1269 * Using message-based transmissions to ensure we don't
1270 * have to deal with partially received messages.
1271 */
1272 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1273 sizeof(struct ust_register_msg));
1274 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1275 if (ret < 0) {
1276 perror("lttcomm_recv_unix_sock register apps");
1277 } else {
1278 ERR("Wrong size received on apps register");
1279 }
1280 free(ust_cmd);
1281 close(sock);
1282 continue;
1283 }
099e26bd 1284
5eb91c98 1285 ust_cmd->sock = sock;
099e26bd 1286
5eb91c98
DG
1287 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1288 " gid:%d sock:%d name:%s (version %d.%d)",
1289 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1290 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1291 ust_cmd->sock, ust_cmd->reg_msg.name,
1292 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1293
5eb91c98
DG
1294 /*
1295 * Lock free enqueue the registration request. The red pill
54d01ffb 1296 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1297 */
1298 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1299
1300 /*
1301 * Wake the registration queue futex. Implicit memory
1302 * barrier with the exchange in cds_wfq_enqueue.
1303 */
1304 futex_nto1_wake(&ust_cmd_queue.futex);
1305 }
1306 }
90014c57 1307 }
1d4b027a
DG
1308 }
1309
1310error:
0fdd1e2c
DG
1311 DBG("UST Registration thread dying");
1312
1313 /* Notify that the registration thread is gone */
1314 notify_ust_apps(0);
1315
1316 close(apps_sock);
1317 close(sock);
273ea72c 1318 unlink(apps_unix_sock_path);
0fdd1e2c 1319
5eb91c98
DG
1320 lttng_poll_clean(&events);
1321
1d4b027a
DG
1322 return NULL;
1323}
1324
8c0faa1d 1325/*
3bd1e081 1326 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1327 * exec or it will fails.
8c0faa1d 1328 */
3bd1e081 1329static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1330{
1331 int ret;
ee0b0061
DG
1332 struct timespec timeout;
1333
1334 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1335 timeout.tv_nsec = 0;
8c0faa1d
DG
1336
1337 /* Setup semaphore */
3bd1e081 1338 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1339 if (ret < 0) {
3bd1e081 1340 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1341 goto error;
1342 }
8c0faa1d 1343
3bd1e081
MD
1344 ret = pthread_create(&consumer_data->thread, NULL,
1345 thread_manage_consumer, consumer_data);
8c0faa1d 1346 if (ret != 0) {
3bd1e081 1347 PERROR("pthread_create consumer");
ee0b0061 1348 ret = -1;
8c0faa1d
DG
1349 goto error;
1350 }
1351
ee0b0061
DG
1352 /* Get time for sem_timedwait absolute timeout */
1353 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1354 if (ret < 0) {
3bd1e081 1355 PERROR("clock_gettime spawn consumer");
ee0b0061 1356 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1357 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1358 } else {
1359 /* Normal timeout if the gettime was successful */
1360 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1361 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1362 }
8c0faa1d 1363
ee0b0061
DG
1364 if (ret < 0) {
1365 if (errno == ETIMEDOUT) {
1366 /*
1367 * Call has timed out so we kill the kconsumerd_thread and return
1368 * an error.
1369 */
3bd1e081
MD
1370 ERR("The consumer thread was never ready. Killing it");
1371 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1372 if (ret < 0) {
3bd1e081 1373 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1374 }
1375 } else {
3bd1e081 1376 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1377 }
1378 goto error;
1379 }
1380
3bd1e081
MD
1381 pthread_mutex_lock(&consumer_data->pid_mutex);
1382 if (consumer_data->pid == 0) {
712ea556 1383 ERR("Kconsumerd did not start");
3bd1e081 1384 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1385 goto error;
1386 }
3bd1e081 1387 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1388
8c0faa1d
DG
1389 return 0;
1390
1391error:
1392 return ret;
1393}
1394
d9800920 1395/*
3bd1e081 1396 * Join consumer thread
d9800920 1397 */
3bd1e081 1398static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1399{
1400 void *status;
1401 int ret;
1402
3bd1e081
MD
1403 if (consumer_data->pid != 0) {
1404 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1405 if (ret) {
3bd1e081 1406 ERR("Error killing consumer daemon");
cf3af59e
MD
1407 return ret;
1408 }
3bd1e081 1409 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1410 } else {
1411 return 0;
1412 }
1413}
1414
8c0faa1d 1415/*
3bd1e081 1416 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1417 *
d063d709 1418 * Return pid if successful else -1.
8c0faa1d 1419 */
3bd1e081 1420static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1421{
1422 int ret;
1423 pid_t pid;
53086306 1424 const char *verbosity;
8c0faa1d 1425
3bd1e081 1426 DBG("Spawning consumerd");
c49dc785 1427
8c0faa1d
DG
1428 pid = fork();
1429 if (pid == 0) {
1430 /*
3bd1e081 1431 * Exec consumerd.
8c0faa1d 1432 */
3bd1e081 1433 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG
1434 verbosity = "--verbose";
1435 } else {
1436 verbosity = "--quiet";
1437 }
3bd1e081
MD
1438 switch (consumer_data->type) {
1439 case LTTNG_CONSUMER_KERNEL:
1440 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1441 "lttng-consumerd", verbosity, "-k", NULL);
1442 break;
1443 case LTTNG_CONSUMER_UST:
1444 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1445 "lttng-consumerd", verbosity, "-u", NULL);
1446 break;
1447 default:
1448 perror("unknown consumer type");
1449 exit(EXIT_FAILURE);
1450 }
8c0faa1d
DG
1451 if (errno != 0) {
1452 perror("kernel start consumer exec");
1453 }
1454 exit(EXIT_FAILURE);
1455 } else if (pid > 0) {
1456 ret = pid;
8c0faa1d 1457 } else {
3bd1e081 1458 perror("start consumer fork");
8c0faa1d 1459 ret = -errno;
8c0faa1d 1460 }
8c0faa1d
DG
1461 return ret;
1462}
1463
693bd40b 1464/*
3bd1e081 1465 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1466 */
3bd1e081 1467static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1468{
1469 int ret;
1470
3bd1e081
MD
1471 pthread_mutex_lock(&consumer_data->pid_mutex);
1472 if (consumer_data->pid != 0) {
1473 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1474 goto end;
1475 }
693bd40b 1476
3bd1e081 1477 ret = spawn_consumerd(consumer_data);
c49dc785 1478 if (ret < 0) {
3bd1e081
MD
1479 ERR("Spawning consumerd failed");
1480 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1481 goto error;
693bd40b 1482 }
c49dc785 1483
3bd1e081
MD
1484 /* Setting up the consumer_data pid */
1485 consumer_data->pid = ret;
48842b30 1486 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1487 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1488
3bd1e081
MD
1489 DBG2("Spawning consumer control thread");
1490 ret = spawn_consumer_thread(consumer_data);
693bd40b 1491 if (ret < 0) {
3bd1e081 1492 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1493 goto error;
1494 }
1495
c49dc785 1496end:
693bd40b
DG
1497 return 0;
1498
1499error:
1500 return ret;
1501}
1502
b73401da 1503/*
d063d709 1504 * modprobe_kernel_modules
b73401da
DG
1505 */
1506static int modprobe_kernel_modules(void)
1507{
ab147185 1508 int ret = 0, i;
b73401da
DG
1509 char modprobe[256];
1510
ab147185
MD
1511 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1512 ret = snprintf(modprobe, sizeof(modprobe),
1513 "/sbin/modprobe %s%s",
24b487b8 1514 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1515 kernel_modules_list[i].name);
b73401da
DG
1516 if (ret < 0) {
1517 perror("snprintf modprobe");
1518 goto error;
1519 }
ab147185 1520 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1521 ret = system(modprobe);
ab147185
MD
1522 if (ret == -1) {
1523 ERR("Unable to launch modprobe for module %s",
1524 kernel_modules_list[i].name);
1525 } else if (kernel_modules_list[i].required
d9800920 1526 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1527 ERR("Unable to load module %s",
1528 kernel_modules_list[i].name);
1529 } else {
1530 DBG("Modprobe successfully %s",
1531 kernel_modules_list[i].name);
1532 }
1533 }
1534
1535error:
1536 return ret;
1537}
1538
b73401da 1539/*
d063d709 1540 * mount_debugfs
b73401da
DG
1541 */
1542static int mount_debugfs(char *path)
1543{
1544 int ret;
1545 char *type = "debugfs";
1546
996b65c8 1547 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1548 if (ret < 0) {
7272acf5 1549 PERROR("Cannot create debugfs path");
b73401da
DG
1550 goto error;
1551 }
1552
1553 ret = mount(type, path, type, 0, NULL);
1554 if (ret < 0) {
7272acf5 1555 PERROR("Cannot mount debugfs");
b73401da
DG
1556 goto error;
1557 }
1558
1559 DBG("Mounted debugfs successfully at %s", path);
1560
1561error:
1562 return ret;
1563}
1564
8c0faa1d 1565/*
d063d709 1566 * Setup necessary data for kernel tracer action.
8c0faa1d 1567 */
f3ed775e 1568static void init_kernel_tracer(void)
8c0faa1d 1569{
b73401da
DG
1570 int ret;
1571 char *proc_mounts = "/proc/mounts";
1572 char line[256];
684d34d2 1573 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1574 FILE *fp;
1575
1576 /* Detect debugfs */
1577 fp = fopen(proc_mounts, "r");
1578 if (fp == NULL) {
1579 ERR("Unable to probe %s", proc_mounts);
1580 goto error;
1581 }
1582
1583 while (fgets(line, sizeof(line), fp) != NULL) {
1584 if (strstr(line, "debugfs") != NULL) {
1585 /* Remove first string */
1586 strtok(line, " ");
1587 /* Dup string here so we can reuse line later on */
1588 debugfs_path = strdup(strtok(NULL, " "));
1589 DBG("Got debugfs path : %s", debugfs_path);
1590 break;
1591 }
1592 }
1593
1594 fclose(fp);
1595
1596 /* Mount debugfs if needded */
1597 if (debugfs_path == NULL) {
1598 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1599 if (ret < 0) {
1600 perror("asprintf debugfs path");
1601 goto error;
1602 }
1603 ret = mount_debugfs(debugfs_path);
1604 if (ret < 0) {
7272acf5 1605 perror("Cannot mount debugfs");
b73401da
DG
1606 goto error;
1607 }
1608 }
1609
1610 /* Modprobe lttng kernel modules */
1611 ret = modprobe_kernel_modules();
1612 if (ret < 0) {
1613 goto error;
1614 }
1615
1616 /* Setup lttng kernel path */
1617 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1618 if (ret < 0) {
1619 perror("asprintf lttng path");
1620 goto error;
1621 }
1622
1623 /* Open debugfs lttng */
1624 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1625 if (kernel_tracer_fd < 0) {
b73401da
DG
1626 DBG("Failed to open %s", lttng_path);
1627 goto error;
8c0faa1d
DG
1628 }
1629
b73401da
DG
1630 free(lttng_path);
1631 free(debugfs_path);
f3ed775e 1632 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1633 return;
1634
1635error:
1636 if (lttng_path) {
1637 free(lttng_path);
1638 }
1639 if (debugfs_path) {
1640 free(debugfs_path);
1641 }
1642 WARN("No kernel tracer available");
1643 kernel_tracer_fd = 0;
1644 return;
f3ed775e 1645}
33a2b854 1646
f3ed775e 1647/*
54d01ffb 1648 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1649 */
54d01ffb 1650static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1651{
f40799e8 1652 int ret = 0;
8c0faa1d 1653
3bd1e081 1654 if (session->consumer_fds_sent == 0) {
d9800920 1655 /*
54d01ffb
DG
1656 * Assign default kernel consumer socket if no consumer assigned to the
1657 * kernel session. At this point, it's NOT suppose to be 0 but this is
1658 * an extra security check.
d9800920
DG
1659 */
1660 if (session->consumer_fd == 0) {
3bd1e081 1661 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1662 }
1663
2bdd86d4 1664 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1665 if (ret < 0) {
f3ed775e
DG
1666 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1667 goto error;
1668 }
1d4b027a 1669
3bd1e081 1670 session->consumer_fds_sent = 1;
f3ed775e 1671 }
1d4b027a
DG
1672
1673error:
1674 return ret;
8c0faa1d
DG
1675}
1676
0177d773
DG
1677/*
1678 * Create an UST session and add it to the session ust list.
1679 */
44d3bd01
DG
1680static int create_ust_session(struct ltt_session *session,
1681 struct lttng_domain *domain)
0177d773 1682{
44d3bd01 1683 int ret;
48842b30 1684 unsigned int uid;
13384287 1685 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1686
1687 switch (domain->type) {
48842b30 1688 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1689 break;
1690 default:
13384287 1691 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1692 goto error;
1693 }
0177d773
DG
1694
1695 DBG("Creating UST session");
1696
48842b30
DG
1697 session_lock_list();
1698 uid = session_list_ptr->count;
1699 session_unlock_list();
1700
1701 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1702 if (lus == NULL) {
44d3bd01 1703 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1704 goto error;
1705 }
1706
48842b30 1707 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG
1708 geteuid(), allowed_group());
1709 if (ret < 0) {
1710 if (ret != -EEXIST) {
1711 ERR("Trace directory creation error");
44d3bd01 1712 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1713 goto error;
1714 }
1715 }
1716
f6a9efaa
DG
1717 /* The domain type dictate different actions on session creation */
1718 switch (domain->type) {
48842b30
DG
1719 case LTTNG_DOMAIN_UST:
1720 /* No ustctl for the global UST domain */
1721 break;
1722 default:
36dc12cc 1723 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1724 goto error;
0177d773 1725 }
f6a9efaa 1726 session->ust_session = lus;
44d3bd01
DG
1727
1728 return LTTCOMM_OK;
0177d773
DG
1729
1730error:
1731 free(lus);
1732 return ret;
1733}
1734
333f285e 1735/*
d063d709 1736 * Create a kernel tracer session then create the default channel.
333f285e 1737 */
f3ed775e 1738static int create_kernel_session(struct ltt_session *session)
333f285e 1739{
f3ed775e 1740 int ret;
f3ed775e
DG
1741
1742 DBG("Creating kernel session");
1743
1744 ret = kernel_create_session(session, kernel_tracer_fd);
1745 if (ret < 0) {
1746 ret = LTTCOMM_KERN_SESS_FAIL;
1747 goto error;
333f285e
DG
1748 }
1749
d9800920 1750 /* Set kernel consumer socket fd */
3bd1e081
MD
1751 if (kconsumer_data.cmd_sock) {
1752 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1753 }
1754
63053e7c
DG
1755 ret = mkdir_recursive(session->kernel_session->trace_path,
1756 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1757 if (ret < 0) {
996b65c8 1758 if (ret != -EEXIST) {
7a485870
DG
1759 ERR("Trace directory creation error");
1760 goto error;
1761 }
1762 }
1763
f3ed775e
DG
1764error:
1765 return ret;
333f285e
DG
1766}
1767
6c9cc2ab
DG
1768/*
1769 * Using the session list, filled a lttng_session array to send back to the
1770 * client for session listing.
1771 *
1772 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1773 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1774 */
1775static void list_lttng_sessions(struct lttng_session *sessions)
1776{
1777 int i = 0;
1778 struct ltt_session *session;
1779
1780 DBG("Getting all available session");
1781 /*
1782 * Iterate over session list and append data after the control struct in
1783 * the buffer.
1784 */
1785 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1786 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1787 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1788 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1789 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1790 i++;
1791 }
1792}
1793
9f19cc17
DG
1794/*
1795 * Fill lttng_channel array of all channels.
1796 */
1797static void list_lttng_channels(struct ltt_session *session,
1798 struct lttng_channel *channels)
1799{
1800 int i = 0;
1801 struct ltt_kernel_channel *kchan;
1802
1803 DBG("Listing channels for session %s", session->name);
1804
1805 /* Kernel channels */
1806 if (session->kernel_session != NULL) {
54d01ffb
DG
1807 cds_list_for_each_entry(kchan,
1808 &session->kernel_session->channel_list.head, list) {
9f19cc17
DG
1809 /* Copy lttng_channel struct to array */
1810 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1811 channels[i].enabled = kchan->enabled;
1812 i++;
1813 }
1814 }
1815
1816 /* TODO: Missing UST listing */
1817}
1818
1819/*
1820 * Fill lttng_event array of all events in the channel.
1821 */
1822static void list_lttng_events(struct ltt_kernel_channel *kchan,
1823 struct lttng_event *events)
1824{
1825 /*
1826 * TODO: This is ONLY kernel. Need UST support.
1827 */
1828 int i = 0;
1829 struct ltt_kernel_event *event;
1830
1831 DBG("Listing events for channel %s", kchan->channel->name);
1832
1833 /* Kernel channels */
1834 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1835 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1836 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG
1837 events[i].enabled = event->enabled;
1838 switch (event->event->instrumentation) {
1839 case LTTNG_KERNEL_TRACEPOINT:
1840 events[i].type = LTTNG_EVENT_TRACEPOINT;
1841 break;
1842 case LTTNG_KERNEL_KPROBE:
1843 case LTTNG_KERNEL_KRETPROBE:
1844 events[i].type = LTTNG_EVENT_PROBE;
1845 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1846 sizeof(struct lttng_kernel_kprobe));
1847 break;
1848 case LTTNG_KERNEL_FUNCTION:
1849 events[i].type = LTTNG_EVENT_FUNCTION;
1850 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1851 sizeof(struct lttng_kernel_function));
1852 break;
0133c199
MD
1853 case LTTNG_KERNEL_NOOP:
1854 events[i].type = LTTNG_EVENT_NOOP;
1855 break;
a54bd42d
MD
1856 case LTTNG_KERNEL_SYSCALL:
1857 events[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1858 break;
7a3d1328
MD
1859 case LTTNG_KERNEL_ALL:
1860 assert(0);
1861 break;
9f19cc17
DG
1862 }
1863 i++;
1864 }
1865}
1866
fac6795d 1867/*
54d01ffb 1868 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1869 */
54d01ffb
DG
1870static int cmd_disable_channel(struct ltt_session *session,
1871 int domain, char *channel_name)
fac6795d 1872{
54d01ffb 1873 int ret;
379473d2 1874
54d01ffb
DG
1875 switch (domain) {
1876 case LTTNG_DOMAIN_KERNEL:
1877 ret = channel_kernel_disable(session->kernel_session,
1878 channel_name);
1879 if (ret != LTTCOMM_OK) {
333f285e
DG
1880 goto error;
1881 }
54d01ffb
DG
1882
1883 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 1884 break;
44d3bd01
DG
1885 case LTTNG_DOMAIN_UST_PID:
1886 break;
d0254c7c 1887 default:
44d3bd01 1888 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 1889 goto error;
20fe2104
DG
1890 }
1891
54d01ffb 1892 ret = LTTCOMM_OK;
d65106b1 1893
54d01ffb
DG
1894error:
1895 return ret;
1896}
1897
56fff090
DG
1898/*
1899 * Copy channel from attributes and set it in the application channel list.
1900 */
f6a9efaa 1901/*
56fff090
DG
1902static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
1903 struct lttng_channel *attr, struct ust_app *app)
1904{
1905 int ret;
1906 struct ltt_ust_channel *uchan, *new_chan;
1907
f6a9efaa 1908 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
1909 if (uchan == NULL) {
1910 ret = LTTCOMM_FATAL;
1911 goto error;
1912 }
1913
1914 new_chan = trace_ust_create_channel(attr, usess->path);
1915 if (new_chan == NULL) {
1916 PERROR("malloc ltt_ust_channel");
1917 ret = LTTCOMM_FATAL;
1918 goto error;
1919 }
1920
1921 ret = channel_ust_copy(new_chan, uchan);
1922 if (ret < 0) {
1923 ret = LTTCOMM_FATAL;
1924 goto error;
1925 }
1926
56fff090
DG
1927error:
1928 return ret;
1929}
f6a9efaa 1930*/
56fff090 1931
54d01ffb
DG
1932/*
1933 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1934 */
44d3bd01
DG
1935static int cmd_enable_channel(struct ltt_session *session,
1936 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG
1937{
1938 int ret;
f6a9efaa
DG
1939 struct ltt_ust_session *usess = session->ust_session;
1940
1941 DBG("Enabling channel %s for session %s", session->name, attr->name);
d65106b1 1942
44d3bd01
DG
1943 switch (domain->type) {
1944 case LTTNG_DOMAIN_KERNEL:
1945 {
1946 struct ltt_kernel_channel *kchan;
54d01ffb 1947
44d3bd01
DG
1948 kchan = trace_kernel_get_channel_by_name(attr->name,
1949 session->kernel_session);
1950 if (kchan == NULL) {
1951 ret = channel_kernel_create(session->kernel_session,
1952 attr, kernel_poll_pipe[1]);
1953 } else {
1954 ret = channel_kernel_enable(session->kernel_session, kchan);
1955 }
1956
1957 if (ret != LTTCOMM_OK) {
1958 goto error;
1959 }
1960
1961 kernel_wait_quiescent(kernel_tracer_fd);
1962 break;
1963 }
f6a9efaa
DG
1964 case LTTNG_DOMAIN_UST:
1965 {
1966 struct ltt_ust_channel *uchan;
1967
48842b30 1968 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 1969
48842b30 1970 /* Get channel in global UST domain HT */
f6a9efaa
DG
1971 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1972 attr->name);
1973 if (uchan == NULL) {
48842b30 1974 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
1975 if (uchan == NULL) {
1976 ret = LTTCOMM_UST_CHAN_FAIL;
1977 goto error;
1978 }
1979 rcu_read_lock();
1980 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
1981 rcu_read_unlock();
48842b30 1982 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa
DG
1983 } else {
1984 ret = LTTCOMM_UST_CHAN_EXIST;
1985 goto error;
1986 }
1987
421cb601
DG
1988 /* Add channel to all registered applications */
1989 ret = ust_app_add_channel_all(usess, uchan);
48842b30
DG
1990 if (ret != LTTCOMM_OK) {
1991 goto error;
1992 }
f6a9efaa
DG
1993
1994 break;
1995 }
44d3bd01
DG
1996 case LTTNG_DOMAIN_UST_PID:
1997 {
f6a9efaa 1998 /*
56fff090
DG
1999 int sock;
2000 struct ltt_ust_channel *uchan;
44d3bd01 2001 struct ltt_ust_session *usess;
56fff090 2002 struct ust_app *app;
44d3bd01
DG
2003
2004 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2005 domain->attr.pid);
2006 if (usess == NULL) {
2007 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2008 goto error;
2009 }
2010
56fff090 2011 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
2012 if (app == NULL) {
2013 ret = LTTCOMM_APP_NOT_FOUND;
2014 goto error;
2015 }
56fff090 2016 sock = app->sock;
44d3bd01
DG
2017
2018 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2019 if (uchan == NULL) {
56fff090 2020 ret = channel_ust_create(usess, attr, sock);
44d3bd01 2021 } else {
56fff090 2022 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG
2023 }
2024
2025 if (ret != LTTCOMM_OK) {
2026 goto error;
2027 }
2028
56fff090
DG
2029 ret = copy_ust_channel_to_app(usess, attr, app);
2030 if (ret != LTTCOMM_OK) {
44d3bd01
DG
2031 goto error;
2032 }
2033
44d3bd01
DG
2034 DBG("UST channel %s created for app sock %d with pid %d",
2035 attr->name, app->sock, domain->attr.pid);
f6a9efaa
DG
2036 */
2037 ret = LTTCOMM_NOT_IMPLEMENTED;
2038 goto error;
44d3bd01
DG
2039 }
2040 default:
2041 ret = LTTCOMM_UNKNOWN_DOMAIN;
2042 goto error;
54d01ffb
DG
2043 }
2044
2045 ret = LTTCOMM_OK;
2046
2047error:
2048 return ret;
2049}
2050
2051/*
2052 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2053 */
2054static int cmd_disable_event(struct ltt_session *session, int domain,
2055 char *channel_name, char *event_name)
2056{
2057 int ret;
54d01ffb
DG
2058
2059 switch (domain) {
2060 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2061 {
2062 struct ltt_kernel_channel *kchan;
2063
54d01ffb
DG
2064 kchan = trace_kernel_get_channel_by_name(channel_name,
2065 session->kernel_session);
2066 if (kchan == NULL) {
2067 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2068 goto error;
d65106b1
DG
2069 }
2070
7a3d1328 2071 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG
2072 if (ret != LTTCOMM_OK) {
2073 goto error;
2074 }
2075
2076 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2077 break;
2bdd86d4
MD
2078 }
2079 case LTTNG_DOMAIN_UST:
2bdd86d4
MD
2080 case LTTNG_DOMAIN_UST_EXEC_NAME:
2081 case LTTNG_DOMAIN_UST_PID:
2082 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2083 default:
2bdd86d4 2084 /* TODO: Other UST domains */
54d01ffb
DG
2085 ret = LTTCOMM_NOT_IMPLEMENTED;
2086 goto error;
d65106b1 2087 }
26cc6b4e 2088
54d01ffb
DG
2089 ret = LTTCOMM_OK;
2090
2091error:
2092 return ret;
2093}
2094
2095/*
2096 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2097 */
2098static int cmd_disable_event_all(struct ltt_session *session, int domain,
2099 char *channel_name)
2100{
2101 int ret;
2102 struct ltt_kernel_channel *kchan;
2103
2104 switch (domain) {
2105 case LTTNG_DOMAIN_KERNEL:
2106 kchan = trace_kernel_get_channel_by_name(channel_name,
2107 session->kernel_session);
2108 if (kchan == NULL) {
2109 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2110 goto error;
26cc6b4e
DG
2111 }
2112
54d01ffb
DG
2113 ret = event_kernel_disable_all(session->kernel_session, kchan);
2114 if (ret != LTTCOMM_OK) {
0b97ec54 2115 goto error;
26cc6b4e
DG
2116 }
2117
54d01ffb 2118 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2119 break;
54d01ffb
DG
2120 default:
2121 /* TODO: Userspace tracing */
2122 ret = LTTCOMM_NOT_IMPLEMENTED;
2123 goto error;
26cc6b4e 2124 }
e953ef25 2125
54d01ffb 2126 ret = LTTCOMM_OK;
e953ef25 2127
54d01ffb
DG
2128error:
2129 return ret;
2130}
f5177a38 2131
54d01ffb
DG
2132/*
2133 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2134 */
2135static int cmd_add_context(struct ltt_session *session, int domain,
2136 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2137{
2138 int ret;
f5177a38 2139
54d01ffb
DG
2140 switch (domain) {
2141 case LTTNG_DOMAIN_KERNEL:
2142 /* Add kernel context to kernel tracer */
2143 ret = context_kernel_add(session->kernel_session, ctx,
2144 event_name, channel_name);
2145 if (ret != LTTCOMM_OK) {
f5177a38 2146 goto error;
e953ef25 2147 }
2bdd86d4
MD
2148 break;
2149 case LTTNG_DOMAIN_UST:
2150 {
48842b30
DG
2151 /*
2152 struct ltt_ust_session *usess;
e953ef25 2153
48842b30
DG
2154 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2155 ret = context_ust_add(usess, ctx,
2156 event_name, channel_name, domain);
2bdd86d4
MD
2157 if (ret != LTTCOMM_OK) {
2158 goto error;
2159 }
2160 }
e953ef25 2161 break;
48842b30 2162 */
2bdd86d4 2163 }
54d01ffb 2164 default:
2bdd86d4 2165 /* TODO: UST other domains */
54d01ffb
DG
2166 ret = LTTCOMM_NOT_IMPLEMENTED;
2167 goto error;
e953ef25 2168 }
950131af 2169
54d01ffb 2170 ret = LTTCOMM_OK;
950131af 2171
54d01ffb
DG
2172error:
2173 return ret;
2174}
2175
2176/*
2177 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2178 */
2179static int cmd_enable_event(struct ltt_session *session, int domain,
2180 char *channel_name, struct lttng_event *event)
2181{
2182 int ret;
f6cd6b0f 2183 struct lttng_channel *attr;
48842b30 2184 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2185
2186 switch (domain) {
2187 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2188 {
2189 struct ltt_kernel_channel *kchan;
2190
54d01ffb
DG
2191 kchan = trace_kernel_get_channel_by_name(channel_name,
2192 session->kernel_session);
2193 if (kchan == NULL) {
f6cd6b0f
DG
2194 attr = channel_new_default_attr(domain);
2195 if (attr == NULL) {
2196 ret = LTTCOMM_FATAL;
2197 goto error;
2198 }
2199 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2200
54d01ffb 2201 /* This call will notify the kernel thread */
44d3bd01 2202 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2203 attr, kernel_poll_pipe[1]);
54d01ffb 2204 if (ret != LTTCOMM_OK) {
f5177a38
DG
2205 goto error;
2206 }
54d01ffb 2207 }
950131af 2208
54d01ffb
DG
2209 /* Get the newly created kernel channel pointer */
2210 kchan = trace_kernel_get_channel_by_name(channel_name,
2211 session->kernel_session);
2212 if (kchan == NULL) {
2213 /* This sould not happen... */
2214 ret = LTTCOMM_FATAL;
2215 goto error;
2216 }
f5177a38 2217
48842b30
DG
2218 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2219 event);
54d01ffb 2220 if (ret != LTTCOMM_OK) {
f5177a38 2221 goto error;
950131af
DG
2222 }
2223
54d01ffb 2224 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2225 break;
2bdd86d4
MD
2226 }
2227 case LTTNG_DOMAIN_UST:
2228 {
48842b30
DG
2229 struct ltt_ust_channel *uchan;
2230 struct ltt_ust_event *uevent;
2bdd86d4 2231
48842b30
DG
2232 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2233 channel_name);
2234 if (uchan == NULL) {
2235 /* TODO: Create default channel */
2236 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2237 goto error;
2238 }
2bdd86d4 2239
48842b30
DG
2240 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2241 if (uevent == NULL) {
2242 uevent = trace_ust_create_event(event);
2243 if (uevent == NULL) {
2bdd86d4
MD
2244 ret = LTTCOMM_FATAL;
2245 goto error;
2246 }
48842b30 2247 }
2bdd86d4 2248
421cb601 2249 ret = ust_app_add_event_all(usess, uchan, uevent);
48842b30
DG
2250 if (ret < 0) {
2251 ret = LTTCOMM_UST_ENABLE_FAIL;
2252 goto error;
2bdd86d4 2253 }
487cf67c
DG
2254
2255 rcu_read_lock();
2256 hashtable_add_unique(uchan->events, &uevent->node);
2257 rcu_read_unlock();
2bdd86d4
MD
2258 break;
2259 }
2260 case LTTNG_DOMAIN_UST_EXEC_NAME:
2261 case LTTNG_DOMAIN_UST_PID:
2262 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2263 default:
54d01ffb
DG
2264 ret = LTTCOMM_NOT_IMPLEMENTED;
2265 goto error;
950131af 2266 }
d36b8583 2267
54d01ffb 2268 ret = LTTCOMM_OK;
d36b8583 2269
54d01ffb
DG
2270error:
2271 return ret;
2272}
7d29a247 2273
54d01ffb
DG
2274/*
2275 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2276 */
2277static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2278 char *channel_name, int event_type)
54d01ffb
DG
2279{
2280 int ret;
2281 struct ltt_kernel_channel *kchan;
7d29a247 2282
54d01ffb
DG
2283 switch (domain) {
2284 case LTTNG_DOMAIN_KERNEL:
2285 kchan = trace_kernel_get_channel_by_name(channel_name,
2286 session->kernel_session);
2287 if (kchan == NULL) {
2288 /* This call will notify the kernel thread */
44d3bd01
DG
2289 ret = channel_kernel_create(session->kernel_session, NULL,
2290 kernel_poll_pipe[1]);
54d01ffb
DG
2291 if (ret != LTTCOMM_OK) {
2292 goto error;
d36b8583 2293 }
54d01ffb 2294 }
0d0c377a 2295
54d01ffb
DG
2296 /* Get the newly created kernel channel pointer */
2297 kchan = trace_kernel_get_channel_by_name(channel_name,
2298 session->kernel_session);
2299 if (kchan == NULL) {
2300 /* This sould not happen... */
2301 ret = LTTCOMM_FATAL;
2302 goto error;
2303 }
0fdd1e2c 2304
7a3d1328
MD
2305 switch (event_type) {
2306 case LTTNG_KERNEL_SYSCALL:
2307 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2308 kchan, kernel_tracer_fd);
7a3d1328
MD
2309 break;
2310 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2311 /*
7a3d1328
MD
2312 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2313 * events already registered to the channel.
8c9ae521 2314 */
7a3d1328
MD
2315 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2316 kchan, kernel_tracer_fd);
2317 break;
2318 case LTTNG_KERNEL_ALL:
2319 /* Enable syscalls and tracepoints */
8c9ae521
DG
2320 ret = event_kernel_enable_all(session->kernel_session,
2321 kchan, kernel_tracer_fd);
7a3d1328
MD
2322 break;
2323 default:
2324 ret = LTTCOMM_KERN_ENABLE_FAIL;
2325 goto error;
8c9ae521 2326 }
54d01ffb 2327 if (ret != LTTCOMM_OK) {
0d0c377a 2328 goto error;
d36b8583
DG
2329 }
2330
54d01ffb 2331 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2332 break;
54d01ffb
DG
2333 default:
2334 /* TODO: Userspace tracing */
2335 ret = LTTCOMM_NOT_IMPLEMENTED;
2336 goto error;
d36b8583 2337 }
f3ed775e 2338
54d01ffb
DG
2339 ret = LTTCOMM_OK;
2340
2341error:
2342 return ret;
2343}
2344
2345/*
2346 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2347 */
2348static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2349{
2350 int ret;
2351 ssize_t nb_events = 0;
2352
2353 switch (domain) {
2354 case LTTNG_DOMAIN_KERNEL:
2355 nb_events = kernel_list_events(kernel_tracer_fd, events);
2356 if (nb_events < 0) {
2357 ret = LTTCOMM_KERN_LIST_FAIL;
2358 goto error;
894be886 2359 }
54d01ffb
DG
2360 break;
2361 default:
2362 /* TODO: Userspace listing */
2363 ret = LTTCOMM_NOT_IMPLEMENTED;
2364 goto error;
2365 }
894be886 2366
54d01ffb 2367 return nb_events;
7d29a247 2368
54d01ffb
DG
2369error:
2370 /* Return negative value to differentiate return code */
2371 return -ret;
2372}
b389abbe 2373
54d01ffb
DG
2374/*
2375 * Command LTTNG_START_TRACE processed by the client thread.
2376 */
2377static int cmd_start_trace(struct ltt_session *session)
2378{
2379 int ret;
54d01ffb 2380 struct ltt_kernel_session *ksession;
48842b30 2381 struct ltt_ust_session *usess = session->ust_session;
b389abbe 2382
54d01ffb
DG
2383 /* Short cut */
2384 ksession = session->kernel_session;
5eb91c98 2385
54d01ffb
DG
2386 /* Kernel tracing */
2387 if (ksession != NULL) {
2bdd86d4
MD
2388 struct ltt_kernel_channel *kchan;
2389
54d01ffb
DG
2390 /* Open kernel metadata */
2391 if (ksession->metadata == NULL) {
2392 ret = kernel_open_metadata(ksession, ksession->trace_path);
2393 if (ret < 0) {
2394 ret = LTTCOMM_KERN_META_FAIL;
2395 goto error;
b389abbe 2396 }
54d01ffb 2397 }
7d29a247 2398
54d01ffb
DG
2399 /* Open kernel metadata stream */
2400 if (ksession->metadata_stream_fd == 0) {
2401 ret = kernel_open_metadata_stream(ksession);
2402 if (ret < 0) {
2403 ERR("Kernel create metadata stream failed");
2404 ret = LTTCOMM_KERN_STREAM_FAIL;
2405 goto error;
2406 }
2407 }
2408
2409 /* For each channel */
2410 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2411 if (kchan->stream_count == 0) {
2412 ret = kernel_open_channel_stream(kchan);
2413 if (ret < 0) {
2414 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2415 goto error;
2416 }
54d01ffb
DG
2417 /* Update the stream global counter */
2418 ksession->stream_count_global += ret;
7d29a247 2419 }
54d01ffb
DG
2420 }
2421
2422 /* Setup kernel consumer socket and send fds to it */
2423 ret = init_kernel_tracing(ksession);
2424 if (ret < 0) {
2425 ret = LTTCOMM_KERN_START_FAIL;
2426 goto error;
2427 }
2428
2429 /* This start the kernel tracing */
2430 ret = kernel_start_session(ksession);
2431 if (ret < 0) {
2432 ret = LTTCOMM_KERN_START_FAIL;
2433 goto error;
2434 }
2435
2436 /* Quiescent wait after starting trace */
2437 kernel_wait_quiescent(kernel_tracer_fd);
2438 }
2439
36dc12cc
DG
2440 /* Flag session that trace should start automatically */
2441 usess->start_trace = 1;
2442
421cb601 2443 ret = ust_app_start_trace_all(usess);
48842b30
DG
2444 if (ret < 0) {
2445 ret = LTTCOMM_UST_START_FAIL;
2446 goto error;
2bdd86d4 2447 }
54d01ffb
DG
2448
2449 ret = LTTCOMM_OK;
2450
2451error:
2452 return ret;
2453}
2454
2455/*
2456 * Command LTTNG_STOP_TRACE processed by the client thread.
2457 */
2458static int cmd_stop_trace(struct ltt_session *session)
2459{
2460 int ret;
2461 struct ltt_kernel_channel *kchan;
2462 struct ltt_kernel_session *ksession;
48842b30
DG
2463 //struct ltt_ust_session *usess;
2464 //struct ltt_ust_channel *ustchan;
54d01ffb
DG
2465
2466 /* Short cut */
2467 ksession = session->kernel_session;
2468
2469 /* Kernel tracer */
2470 if (ksession != NULL) {
2471 DBG("Stop kernel tracing");
2472
2473 /* Flush all buffers before stopping */
2474 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2475 if (ret < 0) {
2476 ERR("Kernel metadata flush failed");
2477 }
f34daff7 2478
54d01ffb
DG
2479 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2480 ret = kernel_flush_buffer(kchan);
0d0c377a 2481 if (ret < 0) {
54d01ffb 2482 ERR("Kernel flush buffer error");
7d29a247 2483 }
54d01ffb 2484 }
19e70852 2485
54d01ffb
DG
2486 ret = kernel_stop_session(ksession);
2487 if (ret < 0) {
2488 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2489 goto error;
f3ed775e 2490 }
54d01ffb
DG
2491
2492 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2493 }
54d01ffb 2494
48842b30 2495#ifdef DISABLE
2bdd86d4
MD
2496 /* Stop each UST session */
2497 DBG("Stop UST tracing");
48842b30 2498 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2bdd86d4 2499 /* Flush all buffers before stopping */
48842b30 2500 ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj);
2bdd86d4
MD
2501 if (ret < 0) {
2502 ERR("UST metadata flush failed");
2503 }
2504
48842b30
DG
2505 cds_list_for_each_entry(ustchan, &usess->channels.head, list) {
2506 ret = ustctl_flush_buffer(usess->sock, ustchan->obj);
2bdd86d4
MD
2507 if (ret < 0) {
2508 ERR("UST flush buffer error");
2509 }
2510 }
2511
48842b30 2512 ret = ustctl_stop_session(usess->sock, usess->handle);
2bdd86d4
MD
2513 if (ret < 0) {
2514 ret = LTTCOMM_KERN_STOP_FAIL;
2515 goto error;
2516 }
2517
48842b30 2518 ustctl_wait_quiescent(usess->sock);
2bdd86d4 2519 }
48842b30 2520#endif
54d01ffb
DG
2521
2522 ret = LTTCOMM_OK;
2523
2524error:
2525 return ret;
2526}
2527
2528/*
2529 * Command LTTNG_CREATE_SESSION processed by the client thread.
2530 */
2531static int cmd_create_session(char *name, char *path)
2532{
2533 int ret;
2534
2535 ret = session_create(name, path);
2536 if (ret != LTTCOMM_OK) {
2537 goto error;
2538 }
2539
2540 ret = LTTCOMM_OK;
2541
2542error:
2543 return ret;
2544}
2545
2546/*
2547 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2548 */
2549static int cmd_destroy_session(struct ltt_session *session, char *name)
2550{
2551 int ret;
2552
2553 /* Clean kernel session teardown */
2554 teardown_kernel_session(session);
2555
2556 /*
2557 * Must notify the kernel thread here to update it's poll setin order
2558 * to remove the channel(s)' fd just destroyed.
2559 */
2560 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2561 if (ret < 0) {
2562 perror("write kernel poll pipe");
2563 }
2564
271933a4 2565 ret = session_destroy(session);
54d01ffb
DG
2566
2567 return ret;
2568}
2569
2570/*
2571 * Command LTTNG_CALIBRATE processed by the client thread.
2572 */
2573static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2574{
2575 int ret;
2576
2577 switch (domain) {
2578 case LTTNG_DOMAIN_KERNEL:
33a2b854 2579 {
54d01ffb 2580 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2581
54d01ffb
DG
2582 kcalibrate.type = calibrate->type;
2583 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2584 if (ret < 0) {
54d01ffb
DG
2585 ret = LTTCOMM_KERN_ENABLE_FAIL;
2586 goto error;
33a2b854 2587 }
54d01ffb
DG
2588 break;
2589 }
2590 default:
2591 /* TODO: Userspace tracing */
2592 ret = LTTCOMM_NOT_IMPLEMENTED;
2593 goto error;
2594 }
33a2b854 2595
54d01ffb 2596 ret = LTTCOMM_OK;
33a2b854 2597
54d01ffb
DG
2598error:
2599 return ret;
2600}
7d29a247 2601
54d01ffb
DG
2602/*
2603 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2604 */
2605static int cmd_register_consumer(struct ltt_session *session, int domain,
2606 char *sock_path)
2607{
2608 int ret, sock;
b389abbe 2609
54d01ffb
DG
2610 switch (domain) {
2611 case LTTNG_DOMAIN_KERNEL:
2612 /* Can't register a consumer if there is already one */
2613 if (session->kernel_session->consumer_fd != 0) {
2614 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2615 goto error;
2616 }
2617
2618 sock = lttcomm_connect_unix_sock(sock_path);
2619 if (sock < 0) {
2620 ret = LTTCOMM_CONNECT_FAIL;
2621 goto error;
2622 }
2623
2624 session->kernel_session->consumer_fd = sock;
2625 break;
2626 default:
2627 /* TODO: Userspace tracing */
2628 ret = LTTCOMM_NOT_IMPLEMENTED;
2629 goto error;
2630 }
2631
2632 ret = LTTCOMM_OK;
2633
2634error:
2635 return ret;
2636}
2637
2638/*
2639 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2640 */
2641static ssize_t cmd_list_domains(struct ltt_session *session,
2642 struct lttng_domain **domains)
2643{
2644 int ret;
2645 ssize_t nb_dom = 0;
2646
2647 if (session->kernel_session != NULL) {
2648 nb_dom++;
2649 }
2650
f6a9efaa 2651 /* TODO: User-space tracer domain support */
54d01ffb
DG
2652
2653 *domains = malloc(nb_dom * sizeof(struct lttng_domain));
2654 if (*domains == NULL) {
2655 ret = -LTTCOMM_FATAL;
2656 goto error;
2657 }
2658
2659 (*domains)[0].type = LTTNG_DOMAIN_KERNEL;
2660
54d01ffb
DG
2661 return nb_dom;
2662
2663error:
2664 return ret;
2665}
2666
2667/*
2668 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2669 */
2670static ssize_t cmd_list_channels(struct ltt_session *session,
2671 struct lttng_channel **channels)
2672{
2673 int ret;
2674 ssize_t nb_chan = 0;
2675
2676 if (session->kernel_session != NULL) {
2677 nb_chan += session->kernel_session->channel_count;
2678 }
2679
2680 *channels = malloc(nb_chan * sizeof(struct lttng_channel));
2681 if (*channels == NULL) {
2682 ret = -LTTCOMM_FATAL;
2683 goto error;
2684 }
2685
2686 list_lttng_channels(session, *channels);
2687
2bdd86d4
MD
2688 /* TODO UST support */
2689
54d01ffb
DG
2690 return nb_chan;
2691
2692error:
2693 return ret;
2694}
2695
2696/*
2697 * Command LTTNG_LIST_EVENTS processed by the client thread.
2698 */
2699static ssize_t cmd_list_events(struct ltt_session *session,
2700 char *channel_name, struct lttng_event **events)
2701{
2702 int ret;
2703 ssize_t nb_event = 0;
2704 struct ltt_kernel_channel *kchan = NULL;
2705
2706 if (session->kernel_session != NULL) {
2707 kchan = trace_kernel_get_channel_by_name(channel_name,
2708 session->kernel_session);
2709 if (kchan == NULL) {
2710 ret = -LTTCOMM_KERN_CHAN_NOT_FOUND;
2711 goto error;
2712 }
2713 nb_event += kchan->event_count;
2714 }
2715
2716 *events = malloc(nb_event * sizeof(struct lttng_event));
2717 if (*events == NULL) {
2718 ret = -LTTCOMM_FATAL;
2719 goto error;
2720 }
2721
2722 list_lttng_events(kchan, *events);
2723
2724 /* TODO: User-space tracer support */
2725
2726 return nb_event;
2727
2728error:
2729 return ret;
2730}
2731
2732/*
2733 * Process the command requested by the lttng client within the command
2734 * context structure. This function make sure that the return structure (llm)
2735 * is set and ready for transmission before returning.
2736 *
2737 * Return any error encountered or 0 for success.
2738 */
2739static int process_client_msg(struct command_ctx *cmd_ctx)
2740{
2741 int ret = LTTCOMM_OK;
44d3bd01 2742 int need_tracing_session = 1;
54d01ffb
DG
2743
2744 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2745
2746 /*
2747 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2748 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2749 * command.
2750 */
2751 switch(cmd_ctx->lsm->cmd_type) {
2752 case LTTNG_LIST_SESSIONS:
2753 case LTTNG_LIST_TRACEPOINTS:
2754 case LTTNG_LIST_DOMAINS:
2755 case LTTNG_LIST_CHANNELS:
2756 case LTTNG_LIST_EVENTS:
2757 break;
2758 default:
2759 /* Setup lttng message with no payload */
2760 ret = setup_lttng_msg(cmd_ctx, 0);
2761 if (ret < 0) {
2762 /* This label does not try to unlock the session */
2763 goto init_setup_error;
2764 }
2765 }
2766
2767 /* Commands that DO NOT need a session. */
2768 switch (cmd_ctx->lsm->cmd_type) {
2769 case LTTNG_CALIBRATE:
2770 case LTTNG_CREATE_SESSION:
2771 case LTTNG_LIST_SESSIONS:
2772 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2773 need_tracing_session = 0;
54d01ffb
DG
2774 break;
2775 default:
2776 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 2777 session_lock_list();
54d01ffb 2778 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 2779 session_unlock_list();
54d01ffb
DG
2780 if (cmd_ctx->session == NULL) {
2781 if (cmd_ctx->lsm->session.name != NULL) {
2782 ret = LTTCOMM_SESS_NOT_FOUND;
2783 } else {
2784 /* If no session name specified */
2785 ret = LTTCOMM_SELECT_SESS;
2786 }
2787 goto error;
2788 } else {
2789 /* Acquire lock for the session */
2790 session_lock(cmd_ctx->session);
2791 }
2792 break;
2793 }
b389abbe 2794
54d01ffb
DG
2795 /*
2796 * Check domain type for specific "pre-action".
2797 */
2798 switch (cmd_ctx->lsm->domain.type) {
2799 case LTTNG_DOMAIN_KERNEL:
2800 /* Kernel tracer check */
2801 if (kernel_tracer_fd == 0) {
2802 /* Basically, load kernel tracer modules */
2803 init_kernel_tracer();
2804 if (kernel_tracer_fd == 0) {
2805 ret = LTTCOMM_KERN_NA;
2806 goto error;
2807 }
2808 }
5eb91c98 2809
54d01ffb 2810 /* Need a session for kernel command */
44d3bd01 2811 if (need_tracing_session) {
54d01ffb
DG
2812 if (cmd_ctx->session->kernel_session == NULL) {
2813 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2814 if (ret < 0) {
54d01ffb 2815 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2816 goto error;
2817 }
b389abbe 2818 }
7d29a247 2819
54d01ffb 2820 /* Start the kernel consumer daemon */
3bd1e081
MD
2821 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2822 if (kconsumer_data.pid == 0 &&
54d01ffb 2823 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
2824 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2825 ret = start_consumerd(&kconsumer_data);
7d29a247 2826 if (ret < 0) {
54d01ffb
DG
2827 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2828 goto error;
950131af 2829 }
33a2b854 2830 }
3bd1e081 2831 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
0d0c377a 2832 }
54d01ffb 2833 break;
2bdd86d4 2834 case LTTNG_DOMAIN_UST:
44d3bd01 2835 {
44d3bd01 2836 if (need_tracing_session) {
f6a9efaa 2837 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
2838 ret = create_ust_session(cmd_ctx->session,
2839 &cmd_ctx->lsm->domain);
2840 if (ret != LTTCOMM_OK) {
2841 goto error;
2842 }
2843 }
2bdd86d4
MD
2844 /* Start the kernel consumer daemon */
2845 pthread_mutex_lock(&ustconsumer_data.pid_mutex);
2846 if (ustconsumer_data.pid == 0 &&
2847 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2848 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
2849 ret = start_consumerd(&ustconsumer_data);
2850 if (ret < 0) {
2851 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2852 goto error;
2853 }
48842b30
DG
2854
2855 cmd_ctx->session->ust_session->consumer_fd =
2856 ustconsumer_data.cmd_sock;
2bdd86d4
MD
2857 }
2858 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
44d3bd01
DG
2859 }
2860 break;
48842b30 2861 }
54d01ffb 2862 default:
54d01ffb
DG
2863 break;
2864 }
33a2b854 2865
54d01ffb
DG
2866 /* Process by command type */
2867 switch (cmd_ctx->lsm->cmd_type) {
2868 case LTTNG_ADD_CONTEXT:
2869 {
2870 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2871 cmd_ctx->lsm->u.context.channel_name,
2872 cmd_ctx->lsm->u.context.event_name,
2873 &cmd_ctx->lsm->u.context.ctx);
2874 break;
2875 }
2876 case LTTNG_DISABLE_CHANNEL:
2877 {
2878 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2879 cmd_ctx->lsm->u.disable.channel_name);
2880 break;
2881 }
2882 case LTTNG_DISABLE_EVENT:
2883 {
2884 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2885 cmd_ctx->lsm->u.disable.channel_name,
2886 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2887 ret = LTTCOMM_OK;
2888 break;
2889 }
54d01ffb
DG
2890 case LTTNG_DISABLE_ALL_EVENT:
2891 {
2bdd86d4 2892 DBG("Disabling all events");
54d01ffb
DG
2893
2894 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2895 cmd_ctx->lsm->u.disable.channel_name);
2896 break;
2897 }
2898 case LTTNG_ENABLE_CHANNEL:
2899 {
44d3bd01 2900 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG
2901 &cmd_ctx->lsm->u.channel.chan);
2902 break;
2903 }
2904 case LTTNG_ENABLE_EVENT:
2905 {
2906 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2907 cmd_ctx->lsm->u.enable.channel_name,
2908 &cmd_ctx->lsm->u.enable.event);
2909 break;
2910 }
2911 case LTTNG_ENABLE_ALL_EVENT:
2912 {
2bdd86d4 2913 DBG("Enabling all events");
54d01ffb
DG
2914
2915 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
2916 cmd_ctx->lsm->u.enable.channel_name,
2917 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
2918 break;
2919 }
052da939 2920 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2921 {
9f19cc17 2922 struct lttng_event *events;
54d01ffb 2923 ssize_t nb_events;
052da939 2924
54d01ffb
DG
2925 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2926 if (nb_events < 0) {
2927 ret = -nb_events;
2928 goto error;
2ef84c95
DG
2929 }
2930
2931 /*
2932 * Setup lttng message with payload size set to the event list size in
2933 * bytes and then copy list into the llm payload.
2934 */
052da939 2935 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2936 if (ret < 0) {
052da939 2937 free(events);
2ef84c95
DG
2938 goto setup_error;
2939 }
2940
2941 /* Copy event list into message payload */
9f19cc17 2942 memcpy(cmd_ctx->llm->payload, events,
052da939 2943 sizeof(struct lttng_event) * nb_events);
2ef84c95 2944
9f19cc17 2945 free(events);
2ef84c95
DG
2946
2947 ret = LTTCOMM_OK;
2948 break;
2949 }
f3ed775e 2950 case LTTNG_START_TRACE:
8c0faa1d 2951 {
54d01ffb 2952 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2953 break;
2954 }
f3ed775e 2955 case LTTNG_STOP_TRACE:
8c0faa1d 2956 {
54d01ffb 2957 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2958 break;
2959 }
5e16da05
MD
2960 case LTTNG_CREATE_SESSION:
2961 {
54d01ffb
DG
2962 ret = cmd_create_session(cmd_ctx->lsm->session.name,
2963 cmd_ctx->lsm->session.path);
5e16da05
MD
2964 break;
2965 }
2966 case LTTNG_DESTROY_SESSION:
2967 {
54d01ffb
DG
2968 ret = cmd_destroy_session(cmd_ctx->session,
2969 cmd_ctx->lsm->session.name);
5461b305 2970 break;
5e16da05 2971 }
9f19cc17 2972 case LTTNG_LIST_DOMAINS:
5e16da05 2973 {
54d01ffb
DG
2974 ssize_t nb_dom;
2975 struct lttng_domain *domains;
5461b305 2976
54d01ffb
DG
2977 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2978 if (nb_dom < 0) {
2979 ret = -nb_dom;
2980 goto error;
ce3d728c 2981 }
520ff687 2982
54d01ffb 2983 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
2984 if (ret < 0) {
2985 goto setup_error;
520ff687 2986 }
57167058 2987
54d01ffb
DG
2988 /* Copy event list into message payload */
2989 memcpy(cmd_ctx->llm->payload, domains,
2990 nb_dom * sizeof(struct lttng_domain));
2991
2992 free(domains);
5e16da05 2993
5461b305 2994 ret = LTTCOMM_OK;
5e16da05
MD
2995 break;
2996 }
9f19cc17 2997 case LTTNG_LIST_CHANNELS:
5e16da05 2998 {
54d01ffb
DG
2999 size_t nb_chan;
3000 struct lttng_channel *channels;
3001
3002 nb_chan = cmd_list_channels(cmd_ctx->session, &channels);
3003 if (nb_chan < 0) {
3004 ret = -nb_chan;
3005 goto error;
5461b305 3006 }
ca95a216 3007
54d01ffb 3008 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
3009 if (ret < 0) {
3010 goto setup_error;
3011 }
9f19cc17 3012
54d01ffb
DG
3013 /* Copy event list into message payload */
3014 memcpy(cmd_ctx->llm->payload, channels,
3015 nb_chan * sizeof(struct lttng_channel));
3016
3017 free(channels);
9f19cc17
DG
3018
3019 ret = LTTCOMM_OK;
5461b305 3020 break;
5e16da05 3021 }
9f19cc17 3022 case LTTNG_LIST_EVENTS:
5e16da05 3023 {
54d01ffb 3024 size_t nb_event;
684d34d2 3025 struct lttng_event *events = NULL;
9f19cc17 3026
54d01ffb
DG
3027 nb_event = cmd_list_events(cmd_ctx->session,
3028 cmd_ctx->lsm->u.list.channel_name, &events);
3029 if (nb_event < 0) {
3030 ret = -nb_event;
3031 goto error;
5461b305 3032 }
ca95a216 3033
54d01ffb 3034 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
3035 if (ret < 0) {
3036 goto setup_error;
3037 }
9f19cc17 3038
54d01ffb
DG
3039 /* Copy event list into message payload */
3040 memcpy(cmd_ctx->llm->payload, events,
3041 nb_event * sizeof(struct lttng_event));
9f19cc17 3042
54d01ffb 3043 free(events);
9f19cc17
DG
3044
3045 ret = LTTCOMM_OK;
5461b305 3046 break;
5e16da05
MD
3047 }
3048 case LTTNG_LIST_SESSIONS:
3049 {
54d01ffb 3050 session_lock_list();
5461b305 3051
6c9cc2ab 3052 if (session_list_ptr->count == 0) {
f3ed775e 3053 ret = LTTCOMM_NO_SESSION;
54d01ffb 3054 session_unlock_list();
5461b305 3055 goto error;
57167058 3056 }
5e16da05 3057
6c9cc2ab
DG
3058 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3059 session_list_ptr->count);
5461b305 3060 if (ret < 0) {
54d01ffb 3061 session_unlock_list();
5461b305 3062 goto setup_error;
e065084a 3063 }
5e16da05 3064
6c9cc2ab
DG
3065 /* Filled the session array */
3066 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3067
54d01ffb 3068 session_unlock_list();
5e16da05 3069
5461b305 3070 ret = LTTCOMM_OK;
5e16da05
MD
3071 break;
3072 }
d0254c7c
MD
3073 case LTTNG_CALIBRATE:
3074 {
54d01ffb
DG
3075 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3076 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
3077 break;
3078 }
d9800920
DG
3079 case LTTNG_REGISTER_CONSUMER:
3080 {
54d01ffb
DG
3081 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3082 cmd_ctx->lsm->u.reg.path);
d9800920
DG
3083 break;
3084 }
5e16da05 3085 default:
5e16da05 3086 ret = LTTCOMM_UND;
5461b305 3087 break;
fac6795d
DG
3088 }
3089
5461b305 3090error:
5461b305
DG
3091 if (cmd_ctx->llm == NULL) {
3092 DBG("Missing llm structure. Allocating one.");
894be886 3093 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
3094 goto setup_error;
3095 }
3096 }
54d01ffb 3097 /* Set return code */
5461b305 3098 cmd_ctx->llm->ret_code = ret;
5461b305 3099setup_error:
b5541356 3100 if (cmd_ctx->session) {
54d01ffb 3101 session_unlock(cmd_ctx->session);
b5541356 3102 }
54d01ffb 3103init_setup_error:
8028d920 3104 return ret;
fac6795d
DG
3105}
3106
1d4b027a 3107/*
d063d709
DG
3108 * This thread manage all clients request using the unix client socket for
3109 * communication.
1d4b027a
DG
3110 */
3111static void *thread_manage_clients(void *data)
3112{
5eb91c98
DG
3113 int sock = 0, ret, i, pollfd;
3114 uint32_t revents, nb_fd;
273ea72c 3115 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3116 struct lttng_poll_event events;
1d4b027a
DG
3117
3118 DBG("[thread] Manage client started");
3119
f6a9efaa
DG
3120 rcu_register_thread();
3121
1d4b027a
DG
3122 ret = lttcomm_listen_unix_sock(client_sock);
3123 if (ret < 0) {
3124 goto error;
3125 }
3126
5eb91c98
DG
3127 /*
3128 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3129 * more will be added to this poll set.
3130 */
3131 ret = create_thread_poll_set(&events, 2);
3132 if (ret < 0) {
3133 goto error;
3134 }
273ea72c 3135
5eb91c98
DG
3136 /* Add the application registration socket */
3137 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3138 if (ret < 0) {
3139 goto error;
3140 }
273ea72c 3141
bbd973c2
DG
3142 /*
3143 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
3144 */
3145 if (opt_sig_parent) {
3146 kill(ppid, SIGCHLD);
3147 }
3148
3149 while (1) {
1d4b027a 3150 DBG("Accepting client command ...");
273ea72c 3151
5eb91c98
DG
3152 nb_fd = LTTNG_POLL_GETNB(&events);
3153
273ea72c 3154 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3155 ret = lttng_poll_wait(&events, -1);
273ea72c 3156 if (ret < 0) {
273ea72c
DG
3157 goto error;
3158 }
3159
5eb91c98
DG
3160 for (i = 0; i < nb_fd; i++) {
3161 /* Fetch once the poll data */
3162 revents = LTTNG_POLL_GETEV(&events, i);
3163 pollfd = LTTNG_POLL_GETFD(&events, i);
3164
3165 /* Thread quit pipe has been closed. Killing thread. */
3166 ret = check_thread_quit_pipe(pollfd, revents);
3167 if (ret) {
3168 goto error;
3169 }
3170
3171 /* Event on the registration socket */
3172 if (pollfd == client_sock) {
3173 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3174 ERR("Client socket poll error");
3175 goto error;
3176 }
3177 }
3178 }
3179
3180 DBG("Wait for client response");
3181
3182 sock = lttcomm_accept_unix_sock(client_sock);
3183 if (sock < 0) {
273ea72c 3184 goto error;
273ea72c
DG
3185 }
3186
5eb91c98
DG
3187 /* Allocate context command to process the client request */
3188 cmd_ctx = malloc(sizeof(struct command_ctx));
3189 if (cmd_ctx == NULL) {
3190 perror("malloc cmd_ctx");
1d4b027a 3191 goto error;
5eb91c98 3192 }
1d4b027a 3193
5eb91c98
DG
3194 /* Allocate data buffer for reception */
3195 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
3196 if (cmd_ctx->lsm == NULL) {
3197 perror("malloc cmd_ctx->lsm");
3198 goto error;
3199 }
1d4b027a 3200
5eb91c98
DG
3201 cmd_ctx->llm = NULL;
3202 cmd_ctx->session = NULL;
1d4b027a 3203
5eb91c98
DG
3204 /*
3205 * Data is received from the lttng client. The struct
3206 * lttcomm_session_msg (lsm) contains the command and data request of
3207 * the client.
3208 */
3209 DBG("Receiving data from client ...");
3210 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3211 sizeof(struct lttcomm_session_msg));
3212 if (ret <= 0) {
3213 DBG("Nothing recv() from client... continuing");
3214 close(sock);
3215 free(cmd_ctx);
3216 continue;
3217 }
1d4b027a 3218
5eb91c98
DG
3219 // TODO: Validate cmd_ctx including sanity check for
3220 // security purpose.
f7776ea7 3221
f6a9efaa 3222 rcu_thread_online();
5eb91c98
DG
3223 /*
3224 * This function dispatch the work to the kernel or userspace tracer
3225 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3226 * informations for the client. The command context struct contains
3227 * everything this function may needs.
3228 */
3229 ret = process_client_msg(cmd_ctx);
f6a9efaa 3230 rcu_thread_offline();
5eb91c98 3231 if (ret < 0) {
bbd973c2 3232 /*
5eb91c98
DG
3233 * TODO: Inform client somehow of the fatal error. At
3234 * this point, ret < 0 means that a malloc failed
3235 * (ENOMEM). Error detected but still accept command.
bbd973c2 3236 */
bbd973c2 3237 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
3238 continue;
3239 }
d6e4fca4 3240
54d01ffb
DG
3241 DBG("Sending response (size: %d, retcode: %s)",
3242 cmd_ctx->lttng_msg_size,
9a745bc7 3243 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3244 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
3245 if (ret < 0) {
3246 ERR("Failed to send data back to client");
bbd973c2 3247 }
1d4b027a 3248
5eb91c98
DG
3249 clean_command_ctx(&cmd_ctx);
3250
3251 /* End of transmission */
273ea72c
DG
3252 close(sock);
3253 }
3254
5eb91c98
DG
3255error:
3256 DBG("Client thread dying");
273ea72c 3257 unlink(client_unix_sock_path);
5eb91c98
DG
3258 close(client_sock);
3259 close(sock);
273ea72c 3260
5eb91c98 3261 lttng_poll_clean(&events);
a2fb29a5 3262 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG
3263
3264 rcu_unregister_thread();
1d4b027a
DG
3265 return NULL;
3266}
3267
3268
fac6795d
DG
3269/*
3270 * usage function on stderr
3271 */
3272static void usage(void)
3273{
b716ce68 3274 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
3275 fprintf(stderr, " -h, --help Display this usage.\n");
3276 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3277 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3278 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3279 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3bd1e081
MD
3280 fprintf(stderr, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3281 fprintf(stderr, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
d6f42150
DG
3282 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3283 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3284 fprintf(stderr, " -V, --version Show version number.\n");
3285 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3286 fprintf(stderr, " -q, --quiet No output at all.\n");
3287 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3288 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
fac6795d
DG
3289}
3290
3291/*
3292 * daemon argument parsing
3293 */
3294static int parse_args(int argc, char **argv)
3295{
3296 int c;
3297
3298 static struct option long_options[] = {
3299 { "client-sock", 1, 0, 'c' },
3300 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD
3301 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3302 { "kconsumerd-err-sock", 1, 0, 'E' },
3303 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3304 { "ustconsumerd-err-sock", 1, 0, 'F' },
fac6795d 3305 { "daemonize", 0, 0, 'd' },
5b8719f5 3306 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
3307 { "help", 0, 0, 'h' },
3308 { "group", 1, 0, 'g' },
3309 { "version", 0, 0, 'V' },
75462a81 3310 { "quiet", 0, 0, 'q' },
3f9947db 3311 { "verbose", 0, 0, 'v' },
3bd1e081 3312 { "verbose-consumer", 0, 0, 'Z' },
fac6795d
DG
3313 { NULL, 0, 0, 0 }
3314 };
3315
3316 while (1) {
3317 int option_index = 0;
3bd1e081 3318 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
54d01ffb 3319 long_options, &option_index);
fac6795d
DG
3320 if (c == -1) {
3321 break;
3322 }
3323
3324 switch (c) {
3325 case 0:
3326 fprintf(stderr, "option %s", long_options[option_index].name);
3327 if (optarg) {
3328 fprintf(stderr, " with arg %s\n", optarg);
3329 }
3330 break;
b716ce68 3331 case 'c':
fac6795d
DG
3332 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3333 break;
3334 case 'a':
3335 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3336 break;
3337 case 'd':
3338 opt_daemon = 1;
3339 break;
3340 case 'g':
3341 opt_tracing_group = strdup(optarg);
3342 break;
3343 case 'h':
3344 usage();
3345 exit(EXIT_FAILURE);
3346 case 'V':
3347 fprintf(stdout, "%s\n", VERSION);