Fix enabled state when listing UST events
[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
acc7b41b
MD
1060 /*
1061 * Add channel(s) and event(s) to newly registered apps
1062 * from lttng global UST domain.
1063 */
1064 update_ust_app(ust_cmd.sock);
1065
5eb91c98
DG
1066 ret = ustctl_register_done(ust_cmd.sock);
1067 if (ret < 0) {
1068 /*
1069 * If the registration is not possible, we simply
1070 * unregister the apps and continue
1071 */
56fff090 1072 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1073 } else {
1074 /*
1075 * We just need here to monitor the close of the UST
1076 * socket and poll set monitor those by default.
1077 */
1078 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1079 if (ret < 0) {
1080 goto error;
1081 }
1082
54d01ffb
DG
1083 DBG("Apps with sock %d added to poll set",
1084 ust_cmd.sock);
5eb91c98 1085 }
487cf67c 1086
5eb91c98 1087 break;
0177d773 1088 }
5eb91c98
DG
1089 } else {
1090 /*
54d01ffb
DG
1091 * At this point, we know that a registered application made
1092 * the event at poll_wait.
5eb91c98
DG
1093 */
1094 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1095 /* Removing from the poll set */
1096 ret = lttng_poll_del(&events, pollfd);
1097 if (ret < 0) {
1098 goto error;
1099 }
099e26bd 1100
b9d9b220 1101 /* Socket closed on remote end. */
56fff090 1102 ust_app_unregister(pollfd);
5eb91c98
DG
1103 break;
1104 }
099e26bd
DG
1105 }
1106 }
099e26bd
DG
1107 }
1108
1109error:
1110 DBG("Application communication apps dying");
1111 close(apps_cmd_pipe[0]);
1112 close(apps_cmd_pipe[1]);
1113
5eb91c98 1114 lttng_poll_clean(&events);
099e26bd 1115
f6a9efaa
DG
1116 rcu_thread_offline();
1117 rcu_unregister_thread();
099e26bd
DG
1118 return NULL;
1119}
1120
1121/*
1122 * Dispatch request from the registration threads to the application
1123 * communication thread.
1124 */
1125static void *thread_dispatch_ust_registration(void *data)
1126{
1127 int ret;
1128 struct cds_wfq_node *node;
1129 struct ust_command *ust_cmd = NULL;
1130
1131 DBG("[thread] Dispatch UST command started");
1132
1133 while (!dispatch_thread_exit) {
1134 /* Atomically prepare the queue futex */
1135 futex_nto1_prepare(&ust_cmd_queue.futex);
1136
1137 do {
1138 /* Dequeue command for registration */
1139 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1140 if (node == NULL) {
00a17c97 1141 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1142 /* Continue thread execution */
1143 break;
1144 }
1145
1146 ust_cmd = caa_container_of(node, struct ust_command, node);
1147
2f50c8a3
DG
1148 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1149 " gid:%d sock:%d name:%s (version %d.%d)",
1150 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1151 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1152 ust_cmd->sock, ust_cmd->reg_msg.name,
1153 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1154 /*
1155 * Inform apps thread of the new application registration. This
1156 * call is blocking so we can be assured that the data will be read
1157 * at some point in time or wait to the end of the world :)
1158 */
1159 ret = write(apps_cmd_pipe[1], ust_cmd,
1160 sizeof(struct ust_command));
1161 if (ret < 0) {
1162 perror("write apps cmd pipe");
1163 if (errno == EBADF) {
1164 /*
1165 * We can't inform the application thread to process
1166 * registration. We will exit or else application
1167 * registration will not occur and tracing will never
1168 * start.
1169 */
1170 goto error;
1171 }
1172 }
1173 free(ust_cmd);
1174 } while (node != NULL);
1175
1176 /* Futex wait on queue. Blocking call on futex() */
1177 futex_nto1_wait(&ust_cmd_queue.futex);
1178 }
1179
1180error:
1181 DBG("Dispatch thread dying");
1182 return NULL;
1183}
1184
1185/*
1186 * This thread manage application registration.
1187 */
1188static void *thread_registration_apps(void *data)
1d4b027a 1189{
5eb91c98
DG
1190 int sock = 0, i, ret, pollfd;
1191 uint32_t revents, nb_fd;
1192 struct lttng_poll_event events;
099e26bd
DG
1193 /*
1194 * Get allocated in this thread, enqueued to a global queue, dequeued and
1195 * freed in the manage apps thread.
1196 */
1197 struct ust_command *ust_cmd = NULL;
1d4b027a 1198
099e26bd 1199 DBG("[thread] Manage application registration started");
1d4b027a
DG
1200
1201 ret = lttcomm_listen_unix_sock(apps_sock);
1202 if (ret < 0) {
1203 goto error;
1204 }
1205
5eb91c98
DG
1206 /*
1207 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1208 * more will be added to this poll set.
1209 */
1210 ret = create_thread_poll_set(&events, 2);
1211 if (ret < 0) {
1212 goto error;
1213 }
273ea72c 1214
5eb91c98
DG
1215 /* Add the application registration socket */
1216 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1217 if (ret < 0) {
1218 goto error;
1219 }
273ea72c 1220
1d4b027a 1221 /* Notify all applications to register */
0fdd1e2c
DG
1222 ret = notify_ust_apps(1);
1223 if (ret < 0) {
1224 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1225 "Execution continues but there might be problem for already\n"
1226 "running applications that wishes to register.");
0fdd1e2c 1227 }
1d4b027a
DG
1228
1229 while (1) {
1230 DBG("Accepting application registration");
273ea72c 1231
5eb91c98
DG
1232 nb_fd = LTTNG_POLL_GETNB(&events);
1233
273ea72c 1234 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1235 ret = lttng_poll_wait(&events, -1);
273ea72c 1236 if (ret < 0) {
273ea72c
DG
1237 goto error;
1238 }
1239
5eb91c98
DG
1240 for (i = 0; i < nb_fd; i++) {
1241 /* Fetch once the poll data */
1242 revents = LTTNG_POLL_GETEV(&events, i);
1243 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1244
5eb91c98
DG
1245 /* Thread quit pipe has been closed. Killing thread. */
1246 ret = check_thread_quit_pipe(pollfd, revents);
1247 if (ret) {
90014c57
DG
1248 goto error;
1249 }
1d4b027a 1250
5eb91c98
DG
1251 /* Event on the registration socket */
1252 if (pollfd == apps_sock) {
1253 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1254 ERR("Register apps socket poll error");
1255 goto error;
1256 } else if (revents & LPOLLIN) {
1257 sock = lttcomm_accept_unix_sock(apps_sock);
1258 if (sock < 0) {
1259 goto error;
1260 }
099e26bd 1261
5eb91c98
DG
1262 /* Create UST registration command for enqueuing */
1263 ust_cmd = malloc(sizeof(struct ust_command));
1264 if (ust_cmd == NULL) {
1265 perror("ust command malloc");
1266 goto error;
1267 }
1d4b027a 1268
5eb91c98
DG
1269 /*
1270 * Using message-based transmissions to ensure we don't
1271 * have to deal with partially received messages.
1272 */
1273 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1274 sizeof(struct ust_register_msg));
1275 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1276 if (ret < 0) {
1277 perror("lttcomm_recv_unix_sock register apps");
1278 } else {
1279 ERR("Wrong size received on apps register");
1280 }
1281 free(ust_cmd);
1282 close(sock);
1283 continue;
1284 }
099e26bd 1285
5eb91c98 1286 ust_cmd->sock = sock;
099e26bd 1287
5eb91c98
DG
1288 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1289 " gid:%d sock:%d name:%s (version %d.%d)",
1290 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1291 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1292 ust_cmd->sock, ust_cmd->reg_msg.name,
1293 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1294
5eb91c98
DG
1295 /*
1296 * Lock free enqueue the registration request. The red pill
54d01ffb 1297 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1298 */
1299 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1300
1301 /*
1302 * Wake the registration queue futex. Implicit memory
1303 * barrier with the exchange in cds_wfq_enqueue.
1304 */
1305 futex_nto1_wake(&ust_cmd_queue.futex);
1306 }
1307 }
90014c57 1308 }
1d4b027a
DG
1309 }
1310
1311error:
0fdd1e2c
DG
1312 DBG("UST Registration thread dying");
1313
1314 /* Notify that the registration thread is gone */
1315 notify_ust_apps(0);
1316
1317 close(apps_sock);
1318 close(sock);
273ea72c 1319 unlink(apps_unix_sock_path);
0fdd1e2c 1320
5eb91c98
DG
1321 lttng_poll_clean(&events);
1322
1d4b027a
DG
1323 return NULL;
1324}
1325
8c0faa1d 1326/*
3bd1e081 1327 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1328 * exec or it will fails.
8c0faa1d 1329 */
3bd1e081 1330static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1331{
1332 int ret;
ee0b0061
DG
1333 struct timespec timeout;
1334
1335 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1336 timeout.tv_nsec = 0;
8c0faa1d
DG
1337
1338 /* Setup semaphore */
3bd1e081 1339 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1340 if (ret < 0) {
3bd1e081 1341 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1342 goto error;
1343 }
8c0faa1d 1344
3bd1e081
MD
1345 ret = pthread_create(&consumer_data->thread, NULL,
1346 thread_manage_consumer, consumer_data);
8c0faa1d 1347 if (ret != 0) {
3bd1e081 1348 PERROR("pthread_create consumer");
ee0b0061 1349 ret = -1;
8c0faa1d
DG
1350 goto error;
1351 }
1352
ee0b0061
DG
1353 /* Get time for sem_timedwait absolute timeout */
1354 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1355 if (ret < 0) {
3bd1e081 1356 PERROR("clock_gettime spawn consumer");
ee0b0061 1357 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1358 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1359 } else {
1360 /* Normal timeout if the gettime was successful */
1361 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1362 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1363 }
8c0faa1d 1364
ee0b0061
DG
1365 if (ret < 0) {
1366 if (errno == ETIMEDOUT) {
1367 /*
1368 * Call has timed out so we kill the kconsumerd_thread and return
1369 * an error.
1370 */
3bd1e081
MD
1371 ERR("The consumer thread was never ready. Killing it");
1372 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1373 if (ret < 0) {
3bd1e081 1374 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1375 }
1376 } else {
3bd1e081 1377 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1378 }
1379 goto error;
1380 }
1381
3bd1e081
MD
1382 pthread_mutex_lock(&consumer_data->pid_mutex);
1383 if (consumer_data->pid == 0) {
712ea556 1384 ERR("Kconsumerd did not start");
3bd1e081 1385 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1386 goto error;
1387 }
3bd1e081 1388 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1389
8c0faa1d
DG
1390 return 0;
1391
1392error:
1393 return ret;
1394}
1395
d9800920 1396/*
3bd1e081 1397 * Join consumer thread
d9800920 1398 */
3bd1e081 1399static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1400{
1401 void *status;
1402 int ret;
1403
3bd1e081
MD
1404 if (consumer_data->pid != 0) {
1405 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1406 if (ret) {
3bd1e081 1407 ERR("Error killing consumer daemon");
cf3af59e
MD
1408 return ret;
1409 }
3bd1e081 1410 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1411 } else {
1412 return 0;
1413 }
1414}
1415
8c0faa1d 1416/*
3bd1e081 1417 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1418 *
d063d709 1419 * Return pid if successful else -1.
8c0faa1d 1420 */
3bd1e081 1421static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1422{
1423 int ret;
1424 pid_t pid;
53086306 1425 const char *verbosity;
8c0faa1d 1426
3bd1e081 1427 DBG("Spawning consumerd");
c49dc785 1428
8c0faa1d
DG
1429 pid = fork();
1430 if (pid == 0) {
1431 /*
3bd1e081 1432 * Exec consumerd.
8c0faa1d 1433 */
3bd1e081 1434 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG
1435 verbosity = "--verbose";
1436 } else {
1437 verbosity = "--quiet";
1438 }
3bd1e081
MD
1439 switch (consumer_data->type) {
1440 case LTTNG_CONSUMER_KERNEL:
1441 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1442 "lttng-consumerd", verbosity, "-k", NULL);
1443 break;
1444 case LTTNG_CONSUMER_UST:
1445 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1446 "lttng-consumerd", verbosity, "-u", NULL);
1447 break;
1448 default:
1449 perror("unknown consumer type");
1450 exit(EXIT_FAILURE);
1451 }
8c0faa1d
DG
1452 if (errno != 0) {
1453 perror("kernel start consumer exec");
1454 }
1455 exit(EXIT_FAILURE);
1456 } else if (pid > 0) {
1457 ret = pid;
8c0faa1d 1458 } else {
3bd1e081 1459 perror("start consumer fork");
8c0faa1d 1460 ret = -errno;
8c0faa1d 1461 }
8c0faa1d
DG
1462 return ret;
1463}
1464
693bd40b 1465/*
3bd1e081 1466 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1467 */
3bd1e081 1468static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1469{
1470 int ret;
1471
3bd1e081
MD
1472 pthread_mutex_lock(&consumer_data->pid_mutex);
1473 if (consumer_data->pid != 0) {
1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1475 goto end;
1476 }
693bd40b 1477
3bd1e081 1478 ret = spawn_consumerd(consumer_data);
c49dc785 1479 if (ret < 0) {
3bd1e081
MD
1480 ERR("Spawning consumerd failed");
1481 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1482 goto error;
693bd40b 1483 }
c49dc785 1484
3bd1e081
MD
1485 /* Setting up the consumer_data pid */
1486 consumer_data->pid = ret;
48842b30 1487 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1488 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1489
3bd1e081
MD
1490 DBG2("Spawning consumer control thread");
1491 ret = spawn_consumer_thread(consumer_data);
693bd40b 1492 if (ret < 0) {
3bd1e081 1493 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1494 goto error;
1495 }
1496
c49dc785 1497end:
693bd40b
DG
1498 return 0;
1499
1500error:
1501 return ret;
1502}
1503
b73401da 1504/*
d063d709 1505 * modprobe_kernel_modules
b73401da
DG
1506 */
1507static int modprobe_kernel_modules(void)
1508{
ab147185 1509 int ret = 0, i;
b73401da
DG
1510 char modprobe[256];
1511
ab147185
MD
1512 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1513 ret = snprintf(modprobe, sizeof(modprobe),
1514 "/sbin/modprobe %s%s",
24b487b8 1515 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1516 kernel_modules_list[i].name);
b73401da
DG
1517 if (ret < 0) {
1518 perror("snprintf modprobe");
1519 goto error;
1520 }
ab147185 1521 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1522 ret = system(modprobe);
ab147185
MD
1523 if (ret == -1) {
1524 ERR("Unable to launch modprobe for module %s",
1525 kernel_modules_list[i].name);
1526 } else if (kernel_modules_list[i].required
d9800920 1527 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1528 ERR("Unable to load module %s",
1529 kernel_modules_list[i].name);
1530 } else {
1531 DBG("Modprobe successfully %s",
1532 kernel_modules_list[i].name);
1533 }
1534 }
1535
1536error:
1537 return ret;
1538}
1539
b73401da 1540/*
d063d709 1541 * mount_debugfs
b73401da
DG
1542 */
1543static int mount_debugfs(char *path)
1544{
1545 int ret;
1546 char *type = "debugfs";
1547
996b65c8 1548 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1549 if (ret < 0) {
7272acf5 1550 PERROR("Cannot create debugfs path");
b73401da
DG
1551 goto error;
1552 }
1553
1554 ret = mount(type, path, type, 0, NULL);
1555 if (ret < 0) {
7272acf5 1556 PERROR("Cannot mount debugfs");
b73401da
DG
1557 goto error;
1558 }
1559
1560 DBG("Mounted debugfs successfully at %s", path);
1561
1562error:
1563 return ret;
1564}
1565
8c0faa1d 1566/*
d063d709 1567 * Setup necessary data for kernel tracer action.
8c0faa1d 1568 */
f3ed775e 1569static void init_kernel_tracer(void)
8c0faa1d 1570{
b73401da
DG
1571 int ret;
1572 char *proc_mounts = "/proc/mounts";
1573 char line[256];
684d34d2 1574 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1575 FILE *fp;
1576
1577 /* Detect debugfs */
1578 fp = fopen(proc_mounts, "r");
1579 if (fp == NULL) {
1580 ERR("Unable to probe %s", proc_mounts);
1581 goto error;
1582 }
1583
1584 while (fgets(line, sizeof(line), fp) != NULL) {
1585 if (strstr(line, "debugfs") != NULL) {
1586 /* Remove first string */
1587 strtok(line, " ");
1588 /* Dup string here so we can reuse line later on */
1589 debugfs_path = strdup(strtok(NULL, " "));
1590 DBG("Got debugfs path : %s", debugfs_path);
1591 break;
1592 }
1593 }
1594
1595 fclose(fp);
1596
1597 /* Mount debugfs if needded */
1598 if (debugfs_path == NULL) {
1599 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1600 if (ret < 0) {
1601 perror("asprintf debugfs path");
1602 goto error;
1603 }
1604 ret = mount_debugfs(debugfs_path);
1605 if (ret < 0) {
7272acf5 1606 perror("Cannot mount debugfs");
b73401da
DG
1607 goto error;
1608 }
1609 }
1610
1611 /* Modprobe lttng kernel modules */
1612 ret = modprobe_kernel_modules();
1613 if (ret < 0) {
1614 goto error;
1615 }
1616
1617 /* Setup lttng kernel path */
1618 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1619 if (ret < 0) {
1620 perror("asprintf lttng path");
1621 goto error;
1622 }
1623
1624 /* Open debugfs lttng */
1625 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1626 if (kernel_tracer_fd < 0) {
b73401da
DG
1627 DBG("Failed to open %s", lttng_path);
1628 goto error;
8c0faa1d
DG
1629 }
1630
b73401da
DG
1631 free(lttng_path);
1632 free(debugfs_path);
f3ed775e 1633 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1634 return;
1635
1636error:
1637 if (lttng_path) {
1638 free(lttng_path);
1639 }
1640 if (debugfs_path) {
1641 free(debugfs_path);
1642 }
1643 WARN("No kernel tracer available");
1644 kernel_tracer_fd = 0;
1645 return;
f3ed775e 1646}
33a2b854 1647
f3ed775e 1648/*
54d01ffb 1649 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1650 */
54d01ffb 1651static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1652{
f40799e8 1653 int ret = 0;
8c0faa1d 1654
3bd1e081 1655 if (session->consumer_fds_sent == 0) {
d9800920 1656 /*
54d01ffb
DG
1657 * Assign default kernel consumer socket if no consumer assigned to the
1658 * kernel session. At this point, it's NOT suppose to be 0 but this is
1659 * an extra security check.
d9800920
DG
1660 */
1661 if (session->consumer_fd == 0) {
3bd1e081 1662 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1663 }
1664
2bdd86d4 1665 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1666 if (ret < 0) {
f3ed775e
DG
1667 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1668 goto error;
1669 }
1d4b027a 1670
3bd1e081 1671 session->consumer_fds_sent = 1;
f3ed775e 1672 }
1d4b027a
DG
1673
1674error:
1675 return ret;
8c0faa1d
DG
1676}
1677
0177d773
DG
1678/*
1679 * Create an UST session and add it to the session ust list.
1680 */
44d3bd01
DG
1681static int create_ust_session(struct ltt_session *session,
1682 struct lttng_domain *domain)
0177d773 1683{
44d3bd01 1684 int ret;
48842b30 1685 unsigned int uid;
13384287 1686 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1687
1688 switch (domain->type) {
48842b30 1689 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1690 break;
1691 default:
13384287 1692 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1693 goto error;
1694 }
0177d773
DG
1695
1696 DBG("Creating UST session");
1697
48842b30
DG
1698 session_lock_list();
1699 uid = session_list_ptr->count;
1700 session_unlock_list();
1701
1702 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1703 if (lus == NULL) {
44d3bd01 1704 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1705 goto error;
1706 }
1707
48842b30 1708 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG
1709 geteuid(), allowed_group());
1710 if (ret < 0) {
1711 if (ret != -EEXIST) {
1712 ERR("Trace directory creation error");
44d3bd01 1713 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1714 goto error;
1715 }
1716 }
1717
f6a9efaa
DG
1718 /* The domain type dictate different actions on session creation */
1719 switch (domain->type) {
48842b30
DG
1720 case LTTNG_DOMAIN_UST:
1721 /* No ustctl for the global UST domain */
1722 break;
1723 default:
36dc12cc 1724 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1725 goto error;
0177d773 1726 }
f6a9efaa 1727 session->ust_session = lus;
44d3bd01
DG
1728
1729 return LTTCOMM_OK;
0177d773
DG
1730
1731error:
1732 free(lus);
1733 return ret;
1734}
1735
333f285e 1736/*
d063d709 1737 * Create a kernel tracer session then create the default channel.
333f285e 1738 */
f3ed775e 1739static int create_kernel_session(struct ltt_session *session)
333f285e 1740{
f3ed775e 1741 int ret;
f3ed775e
DG
1742
1743 DBG("Creating kernel session");
1744
1745 ret = kernel_create_session(session, kernel_tracer_fd);
1746 if (ret < 0) {
1747 ret = LTTCOMM_KERN_SESS_FAIL;
1748 goto error;
333f285e
DG
1749 }
1750
d9800920 1751 /* Set kernel consumer socket fd */
3bd1e081
MD
1752 if (kconsumer_data.cmd_sock) {
1753 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1754 }
1755
63053e7c
DG
1756 ret = mkdir_recursive(session->kernel_session->trace_path,
1757 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1758 if (ret < 0) {
996b65c8 1759 if (ret != -EEXIST) {
7a485870
DG
1760 ERR("Trace directory creation error");
1761 goto error;
1762 }
1763 }
1764
f3ed775e
DG
1765error:
1766 return ret;
333f285e
DG
1767}
1768
6c9cc2ab
DG
1769/*
1770 * Using the session list, filled a lttng_session array to send back to the
1771 * client for session listing.
1772 *
1773 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1774 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1775 */
1776static void list_lttng_sessions(struct lttng_session *sessions)
1777{
1778 int i = 0;
1779 struct ltt_session *session;
1780
1781 DBG("Getting all available session");
1782 /*
1783 * Iterate over session list and append data after the control struct in
1784 * the buffer.
1785 */
1786 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1787 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1788 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1789 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1790 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1791 i++;
1792 }
1793}
1794
9f19cc17
DG
1795/*
1796 * Fill lttng_channel array of all channels.
1797 */
b551a063 1798static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
1799 struct lttng_channel *channels)
1800{
1801 int i = 0;
1802 struct ltt_kernel_channel *kchan;
1803
1804 DBG("Listing channels for session %s", session->name);
1805
b551a063
DG
1806 switch (domain) {
1807 case LTTNG_DOMAIN_KERNEL:
1808 /* Kernel channels */
1809 if (session->kernel_session != NULL) {
1810 cds_list_for_each_entry(kchan,
1811 &session->kernel_session->channel_list.head, list) {
1812 /* Copy lttng_channel struct to array */
1813 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1814 channels[i].enabled = kchan->enabled;
1815 i++;
1816 }
1817 }
1818 break;
1819 case LTTNG_DOMAIN_UST:
1820 {
1821 struct cds_lfht_iter iter;
1822 struct ltt_ust_channel *uchan;
1823
1824 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1825 &iter, uchan, node) {
1826 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1827 channels[i].attr.overwrite = uchan->attr.overwrite;
1828 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1829 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1830 channels[i].attr.switch_timer_interval =
1831 uchan->attr.switch_timer_interval;
1832 channels[i].attr.read_timer_interval =
1833 uchan->attr.read_timer_interval;
1834 channels[i].attr.output = uchan->attr.output;
1835 }
1836 break;
1837 }
1838 default:
1839 break;
1840 }
1841}
1842
1843/*
1844 * Create a list of ust global domain events.
1845 */
1846static int list_lttng_ust_global_events(char *channel_name,
1847 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1848{
1849 int i = 0, ret = 0;
1850 unsigned int nb_event = 0;
1851 struct cds_lfht_iter iter;
1852 struct ltt_ust_channel *uchan;
1853 struct ltt_ust_event *uevent;
1854 struct lttng_event *tmp;
1855
1856 DBG("Listing UST global events for channel %s", channel_name);
1857
1858 rcu_read_lock();
1859
1860 /* Count events in all channels */
1861 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1862 nb_event += hashtable_get_count(uchan->events);
1863 }
1864
1865 if (nb_event == 0) {
1866 ret = nb_event;
1867 goto error;
1868 }
1869
1870 DBG3("Listing UST global %d events", nb_event);
1871
1872 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
1873 if (tmp == NULL) {
1874 ret = -LTTCOMM_FATAL;
1875 goto error;
1876 }
1877
1878 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1879 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
1880 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
1881 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
37357452 1882 tmp[i].enabled = uevent->enabled;
b551a063
DG
1883 switch (uevent->attr.instrumentation) {
1884 case LTTNG_UST_TRACEPOINT:
1885 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
1886 break;
1887 case LTTNG_UST_PROBE:
1888 tmp[i].type = LTTNG_EVENT_PROBE;
1889 break;
1890 case LTTNG_UST_FUNCTION:
1891 tmp[i].type = LTTNG_EVENT_FUNCTION;
1892 break;
1893 }
9f19cc17
DG
1894 i++;
1895 }
1896 }
1897
b551a063
DG
1898 ret = nb_event;
1899 *events = tmp;
1900
1901error:
1902 rcu_read_unlock();
1903 return ret;
9f19cc17
DG
1904}
1905
1906/*
b551a063 1907 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 1908 */
b551a063
DG
1909static int list_lttng_kernel_events(char *channel_name,
1910 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 1911{
b551a063
DG
1912 int i = 0, ret;
1913 unsigned int nb_event;
9f19cc17 1914 struct ltt_kernel_event *event;
b551a063
DG
1915 struct ltt_kernel_channel *kchan;
1916
1917 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
1918 if (kchan == NULL) {
1919 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1920 goto error;
1921 }
1922
1923 nb_event = kchan->event_count;
9f19cc17
DG
1924
1925 DBG("Listing events for channel %s", kchan->channel->name);
1926
b551a063
DG
1927 if (nb_event == 0) {
1928 ret = nb_event;
1929 goto error;
1930 }
1931
1932 *events = zmalloc(nb_event * sizeof(struct lttng_event));
1933 if (*events == NULL) {
1934 ret = LTTCOMM_FATAL;
1935 goto error;
1936 }
1937
9f19cc17
DG
1938 /* Kernel channels */
1939 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
1940 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
1941 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1942 (*events)[i].enabled = event->enabled;
9f19cc17
DG
1943 switch (event->event->instrumentation) {
1944 case LTTNG_KERNEL_TRACEPOINT:
b551a063 1945 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
1946 break;
1947 case LTTNG_KERNEL_KPROBE:
1948 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
1949 (*events)[i].type = LTTNG_EVENT_PROBE;
1950 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
1951 sizeof(struct lttng_kernel_kprobe));
1952 break;
1953 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
1954 (*events)[i].type = LTTNG_EVENT_FUNCTION;
1955 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
1956 sizeof(struct lttng_kernel_function));
1957 break;
0133c199 1958 case LTTNG_KERNEL_NOOP:
b551a063 1959 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 1960 break;
a54bd42d 1961 case LTTNG_KERNEL_SYSCALL:
b551a063 1962 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1963 break;
7a3d1328
MD
1964 case LTTNG_KERNEL_ALL:
1965 assert(0);
1966 break;
9f19cc17
DG
1967 }
1968 i++;
1969 }
b551a063
DG
1970
1971 return nb_event;
1972
1973error:
1974 return ret;
9f19cc17
DG
1975}
1976
fac6795d 1977/*
54d01ffb 1978 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1979 */
54d01ffb
DG
1980static int cmd_disable_channel(struct ltt_session *session,
1981 int domain, char *channel_name)
fac6795d 1982{
54d01ffb 1983 int ret;
379473d2 1984
54d01ffb
DG
1985 switch (domain) {
1986 case LTTNG_DOMAIN_KERNEL:
1987 ret = channel_kernel_disable(session->kernel_session,
1988 channel_name);
1989 if (ret != LTTCOMM_OK) {
333f285e
DG
1990 goto error;
1991 }
54d01ffb
DG
1992
1993 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 1994 break;
44d3bd01
DG
1995 case LTTNG_DOMAIN_UST_PID:
1996 break;
d0254c7c 1997 default:
44d3bd01 1998 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 1999 goto error;
20fe2104
DG
2000 }
2001
54d01ffb 2002 ret = LTTCOMM_OK;
d65106b1 2003
54d01ffb
DG
2004error:
2005 return ret;
2006}
2007
56fff090
DG
2008/*
2009 * Copy channel from attributes and set it in the application channel list.
2010 */
f6a9efaa 2011/*
56fff090
DG
2012static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2013 struct lttng_channel *attr, struct ust_app *app)
2014{
2015 int ret;
2016 struct ltt_ust_channel *uchan, *new_chan;
2017
f6a9efaa 2018 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
2019 if (uchan == NULL) {
2020 ret = LTTCOMM_FATAL;
2021 goto error;
2022 }
2023
2024 new_chan = trace_ust_create_channel(attr, usess->path);
2025 if (new_chan == NULL) {
2026 PERROR("malloc ltt_ust_channel");
2027 ret = LTTCOMM_FATAL;
2028 goto error;
2029 }
2030
2031 ret = channel_ust_copy(new_chan, uchan);
2032 if (ret < 0) {
2033 ret = LTTCOMM_FATAL;
2034 goto error;
2035 }
2036
56fff090
DG
2037error:
2038 return ret;
2039}
f6a9efaa 2040*/
56fff090 2041
54d01ffb
DG
2042/*
2043 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2044 */
44d3bd01
DG
2045static int cmd_enable_channel(struct ltt_session *session,
2046 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG
2047{
2048 int ret;
f6a9efaa
DG
2049 struct ltt_ust_session *usess = session->ust_session;
2050
5d56b5aa 2051 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2052
44d3bd01
DG
2053 switch (domain->type) {
2054 case LTTNG_DOMAIN_KERNEL:
2055 {
2056 struct ltt_kernel_channel *kchan;
54d01ffb 2057
44d3bd01
DG
2058 kchan = trace_kernel_get_channel_by_name(attr->name,
2059 session->kernel_session);
2060 if (kchan == NULL) {
2061 ret = channel_kernel_create(session->kernel_session,
2062 attr, kernel_poll_pipe[1]);
2063 } else {
2064 ret = channel_kernel_enable(session->kernel_session, kchan);
2065 }
2066
2067 if (ret != LTTCOMM_OK) {
2068 goto error;
2069 }
2070
2071 kernel_wait_quiescent(kernel_tracer_fd);
2072 break;
2073 }
f6a9efaa
DG
2074 case LTTNG_DOMAIN_UST:
2075 {
2076 struct ltt_ust_channel *uchan;
2077
48842b30 2078 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2079
48842b30 2080 /* Get channel in global UST domain HT */
f6a9efaa
DG
2081 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2082 attr->name);
2083 if (uchan == NULL) {
48842b30 2084 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
2085 if (uchan == NULL) {
2086 ret = LTTCOMM_UST_CHAN_FAIL;
2087 goto error;
2088 }
d5cd1f34 2089
f6a9efaa
DG
2090 rcu_read_lock();
2091 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2092 rcu_read_unlock();
48842b30 2093 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa
DG
2094 } else {
2095 ret = LTTCOMM_UST_CHAN_EXIST;
2096 goto error;
2097 }
2098
421cb601
DG
2099 /* Add channel to all registered applications */
2100 ret = ust_app_add_channel_all(usess, uchan);
509cbaf8 2101 if (ret != 0) {
48842b30
DG
2102 goto error;
2103 }
f6a9efaa 2104
37357452
DG
2105 uchan->enabled = 1;
2106
f6a9efaa
DG
2107 break;
2108 }
44d3bd01
DG
2109 case LTTNG_DOMAIN_UST_PID:
2110 {
f6a9efaa 2111 /*
56fff090
DG
2112 int sock;
2113 struct ltt_ust_channel *uchan;
44d3bd01 2114 struct ltt_ust_session *usess;
56fff090 2115 struct ust_app *app;
44d3bd01
DG
2116
2117 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2118 domain->attr.pid);
2119 if (usess == NULL) {
2120 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2121 goto error;
2122 }
2123
56fff090 2124 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
2125 if (app == NULL) {
2126 ret = LTTCOMM_APP_NOT_FOUND;
2127 goto error;
2128 }
56fff090 2129 sock = app->sock;
44d3bd01
DG
2130
2131 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2132 if (uchan == NULL) {
56fff090 2133 ret = channel_ust_create(usess, attr, sock);
44d3bd01 2134 } else {
56fff090 2135 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG
2136 }
2137
2138 if (ret != LTTCOMM_OK) {
2139 goto error;
2140 }
2141
56fff090
DG
2142 ret = copy_ust_channel_to_app(usess, attr, app);
2143 if (ret != LTTCOMM_OK) {
44d3bd01
DG
2144 goto error;
2145 }
2146
44d3bd01
DG
2147 DBG("UST channel %s created for app sock %d with pid %d",
2148 attr->name, app->sock, domain->attr.pid);
f6a9efaa
DG
2149 */
2150 ret = LTTCOMM_NOT_IMPLEMENTED;
2151 goto error;
44d3bd01
DG
2152 }
2153 default:
2154 ret = LTTCOMM_UNKNOWN_DOMAIN;
2155 goto error;
54d01ffb
DG
2156 }
2157
2158 ret = LTTCOMM_OK;
2159
2160error:
2161 return ret;
2162}
2163
2164/*
2165 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2166 */
2167static int cmd_disable_event(struct ltt_session *session, int domain,
2168 char *channel_name, char *event_name)
2169{
2170 int ret;
54d01ffb
DG
2171
2172 switch (domain) {
2173 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2174 {
2175 struct ltt_kernel_channel *kchan;
2176
54d01ffb
DG
2177 kchan = trace_kernel_get_channel_by_name(channel_name,
2178 session->kernel_session);
2179 if (kchan == NULL) {
2180 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2181 goto error;
d65106b1
DG
2182 }
2183
7a3d1328 2184 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG
2185 if (ret != LTTCOMM_OK) {
2186 goto error;
2187 }
2188
2189 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2190 break;
2bdd86d4
MD
2191 }
2192 case LTTNG_DOMAIN_UST:
2bdd86d4
MD
2193 case LTTNG_DOMAIN_UST_EXEC_NAME:
2194 case LTTNG_DOMAIN_UST_PID:
2195 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2196 default:
2bdd86d4 2197 /* TODO: Other UST domains */
54d01ffb
DG
2198 ret = LTTCOMM_NOT_IMPLEMENTED;
2199 goto error;
d65106b1 2200 }
26cc6b4e 2201
54d01ffb
DG
2202 ret = LTTCOMM_OK;
2203
2204error:
2205 return ret;
2206}
2207
2208/*
2209 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2210 */
2211static int cmd_disable_event_all(struct ltt_session *session, int domain,
2212 char *channel_name)
2213{
2214 int ret;
2215 struct ltt_kernel_channel *kchan;
2216
2217 switch (domain) {
2218 case LTTNG_DOMAIN_KERNEL:
2219 kchan = trace_kernel_get_channel_by_name(channel_name,
2220 session->kernel_session);
2221 if (kchan == NULL) {
2222 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2223 goto error;
26cc6b4e
DG
2224 }
2225
54d01ffb
DG
2226 ret = event_kernel_disable_all(session->kernel_session, kchan);
2227 if (ret != LTTCOMM_OK) {
0b97ec54 2228 goto error;
26cc6b4e
DG
2229 }
2230
54d01ffb 2231 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2232 break;
54d01ffb
DG
2233 default:
2234 /* TODO: Userspace tracing */
2235 ret = LTTCOMM_NOT_IMPLEMENTED;
2236 goto error;
26cc6b4e 2237 }
e953ef25 2238
54d01ffb 2239 ret = LTTCOMM_OK;
e953ef25 2240
54d01ffb
DG
2241error:
2242 return ret;
2243}
f5177a38 2244
54d01ffb
DG
2245/*
2246 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2247 */
2248static int cmd_add_context(struct ltt_session *session, int domain,
2249 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2250{
2251 int ret;
f5177a38 2252
54d01ffb
DG
2253 switch (domain) {
2254 case LTTNG_DOMAIN_KERNEL:
2255 /* Add kernel context to kernel tracer */
2256 ret = context_kernel_add(session->kernel_session, ctx,
2257 event_name, channel_name);
2258 if (ret != LTTCOMM_OK) {
f5177a38 2259 goto error;
e953ef25 2260 }
2bdd86d4
MD
2261 break;
2262 case LTTNG_DOMAIN_UST:
2263 {
48842b30
DG
2264 /*
2265 struct ltt_ust_session *usess;
e953ef25 2266
48842b30
DG
2267 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2268 ret = context_ust_add(usess, ctx,
2269 event_name, channel_name, domain);
2bdd86d4
MD
2270 if (ret != LTTCOMM_OK) {
2271 goto error;
2272 }
2273 }
e953ef25 2274 break;
48842b30 2275 */
2bdd86d4 2276 }
54d01ffb 2277 default:
2bdd86d4 2278 /* TODO: UST other domains */
54d01ffb
DG
2279 ret = LTTCOMM_NOT_IMPLEMENTED;
2280 goto error;
e953ef25 2281 }
950131af 2282
54d01ffb 2283 ret = LTTCOMM_OK;
950131af 2284
54d01ffb
DG
2285error:
2286 return ret;
2287}
2288
2289/*
2290 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2291 */
2292static int cmd_enable_event(struct ltt_session *session, int domain,
2293 char *channel_name, struct lttng_event *event)
2294{
2295 int ret;
f6cd6b0f 2296 struct lttng_channel *attr;
48842b30 2297 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2298
2299 switch (domain) {
2300 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2301 {
2302 struct ltt_kernel_channel *kchan;
2303
54d01ffb
DG
2304 kchan = trace_kernel_get_channel_by_name(channel_name,
2305 session->kernel_session);
2306 if (kchan == NULL) {
f6cd6b0f
DG
2307 attr = channel_new_default_attr(domain);
2308 if (attr == NULL) {
2309 ret = LTTCOMM_FATAL;
2310 goto error;
2311 }
2312 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2313
54d01ffb 2314 /* This call will notify the kernel thread */
44d3bd01 2315 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2316 attr, kernel_poll_pipe[1]);
54d01ffb 2317 if (ret != LTTCOMM_OK) {
f5177a38
DG
2318 goto error;
2319 }
54d01ffb 2320 }
950131af 2321
54d01ffb
DG
2322 /* Get the newly created kernel channel pointer */
2323 kchan = trace_kernel_get_channel_by_name(channel_name,
2324 session->kernel_session);
2325 if (kchan == NULL) {
2326 /* This sould not happen... */
2327 ret = LTTCOMM_FATAL;
2328 goto error;
2329 }
f5177a38 2330
48842b30
DG
2331 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2332 event);
54d01ffb 2333 if (ret != LTTCOMM_OK) {
f5177a38 2334 goto error;
950131af
DG
2335 }
2336
54d01ffb 2337 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2338 break;
2bdd86d4
MD
2339 }
2340 case LTTNG_DOMAIN_UST:
2341 {
48842b30
DG
2342 struct ltt_ust_channel *uchan;
2343 struct ltt_ust_event *uevent;
2bdd86d4 2344
48842b30
DG
2345 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2346 channel_name);
2347 if (uchan == NULL) {
2348 /* TODO: Create default channel */
2349 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2350 goto error;
2351 }
2bdd86d4 2352
48842b30
DG
2353 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2354 if (uevent == NULL) {
2355 uevent = trace_ust_create_event(event);
2356 if (uevent == NULL) {
2bdd86d4
MD
2357 ret = LTTCOMM_FATAL;
2358 goto error;
2359 }
d5cd1f34 2360
48842b30 2361 }
2bdd86d4 2362
421cb601 2363 ret = ust_app_add_event_all(usess, uchan, uevent);
48842b30
DG
2364 if (ret < 0) {
2365 ret = LTTCOMM_UST_ENABLE_FAIL;
2366 goto error;
2bdd86d4 2367 }
487cf67c 2368
d5cd1f34 2369 /* Add ltt ust event to channel */
487cf67c
DG
2370 rcu_read_lock();
2371 hashtable_add_unique(uchan->events, &uevent->node);
2372 rcu_read_unlock();
d5cd1f34 2373
37357452
DG
2374 uevent->enabled = 1;
2375
d5cd1f34
DG
2376 DBG3("UST ltt event %s added to channel %s", uevent->attr.name,
2377 uchan->name);
2bdd86d4
MD
2378 break;
2379 }
2380 case LTTNG_DOMAIN_UST_EXEC_NAME:
2381 case LTTNG_DOMAIN_UST_PID:
2382 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2383 default:
54d01ffb
DG
2384 ret = LTTCOMM_NOT_IMPLEMENTED;
2385 goto error;
950131af 2386 }
d36b8583 2387
54d01ffb 2388 ret = LTTCOMM_OK;
d36b8583 2389
54d01ffb
DG
2390error:
2391 return ret;
2392}
7d29a247 2393
54d01ffb
DG
2394/*
2395 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2396 */
2397static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2398 char *channel_name, int event_type)
54d01ffb
DG
2399{
2400 int ret;
2401 struct ltt_kernel_channel *kchan;
7d29a247 2402
54d01ffb
DG
2403 switch (domain) {
2404 case LTTNG_DOMAIN_KERNEL:
2405 kchan = trace_kernel_get_channel_by_name(channel_name,
2406 session->kernel_session);
2407 if (kchan == NULL) {
2408 /* This call will notify the kernel thread */
44d3bd01
DG
2409 ret = channel_kernel_create(session->kernel_session, NULL,
2410 kernel_poll_pipe[1]);
54d01ffb
DG
2411 if (ret != LTTCOMM_OK) {
2412 goto error;
d36b8583 2413 }
54d01ffb 2414 }
0d0c377a 2415
54d01ffb
DG
2416 /* Get the newly created kernel channel pointer */
2417 kchan = trace_kernel_get_channel_by_name(channel_name,
2418 session->kernel_session);
2419 if (kchan == NULL) {
2420 /* This sould not happen... */
2421 ret = LTTCOMM_FATAL;
2422 goto error;
2423 }
0fdd1e2c 2424
7a3d1328
MD
2425 switch (event_type) {
2426 case LTTNG_KERNEL_SYSCALL:
2427 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2428 kchan, kernel_tracer_fd);
7a3d1328
MD
2429 break;
2430 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2431 /*
7a3d1328
MD
2432 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2433 * events already registered to the channel.
8c9ae521 2434 */
7a3d1328
MD
2435 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2436 kchan, kernel_tracer_fd);
2437 break;
2438 case LTTNG_KERNEL_ALL:
2439 /* Enable syscalls and tracepoints */
8c9ae521
DG
2440 ret = event_kernel_enable_all(session->kernel_session,
2441 kchan, kernel_tracer_fd);
7a3d1328
MD
2442 break;
2443 default:
2444 ret = LTTCOMM_KERN_ENABLE_FAIL;
2445 goto error;
8c9ae521 2446 }
54d01ffb 2447 if (ret != LTTCOMM_OK) {
0d0c377a 2448 goto error;
d36b8583
DG
2449 }
2450
54d01ffb 2451 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2452 break;
54d01ffb
DG
2453 default:
2454 /* TODO: Userspace tracing */
2455 ret = LTTCOMM_NOT_IMPLEMENTED;
2456 goto error;
d36b8583 2457 }
f3ed775e 2458
54d01ffb
DG
2459 ret = LTTCOMM_OK;
2460
2461error:
2462 return ret;
2463}
2464
2465/*
2466 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2467 */
2468static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2469{
2470 int ret;
2471 ssize_t nb_events = 0;
2472
2473 switch (domain) {
2474 case LTTNG_DOMAIN_KERNEL:
2475 nb_events = kernel_list_events(kernel_tracer_fd, events);
2476 if (nb_events < 0) {
2477 ret = LTTCOMM_KERN_LIST_FAIL;
2478 goto error;
894be886 2479 }
54d01ffb 2480 break;
b551a063
DG
2481 case LTTNG_DOMAIN_UST:
2482 nb_events = ust_app_list_events(events);
2483 if (nb_events < 0) {
2484 ret = LTTCOMM_UST_LIST_FAIL;
2485 goto error;
2486 }
2487 break;
54d01ffb 2488 default:
54d01ffb
DG
2489 ret = LTTCOMM_NOT_IMPLEMENTED;
2490 goto error;
2491 }
894be886 2492
54d01ffb 2493 return nb_events;
7d29a247 2494
54d01ffb
DG
2495error:
2496 /* Return negative value to differentiate return code */
2497 return -ret;
2498}
b389abbe 2499
54d01ffb
DG
2500/*
2501 * Command LTTNG_START_TRACE processed by the client thread.
2502 */
2503static int cmd_start_trace(struct ltt_session *session)
2504{
2505 int ret;
54d01ffb 2506 struct ltt_kernel_session *ksession;
b9d9b220 2507 struct ltt_ust_session *usess;
b389abbe 2508
54d01ffb
DG
2509 /* Short cut */
2510 ksession = session->kernel_session;
b9d9b220 2511 usess = session->ust_session;
5eb91c98 2512
54d01ffb
DG
2513 /* Kernel tracing */
2514 if (ksession != NULL) {
2bdd86d4
MD
2515 struct ltt_kernel_channel *kchan;
2516
54d01ffb
DG
2517 /* Open kernel metadata */
2518 if (ksession->metadata == NULL) {
2519 ret = kernel_open_metadata(ksession, ksession->trace_path);
2520 if (ret < 0) {
2521 ret = LTTCOMM_KERN_META_FAIL;
2522 goto error;
b389abbe 2523 }
54d01ffb 2524 }
7d29a247 2525
54d01ffb
DG
2526 /* Open kernel metadata stream */
2527 if (ksession->metadata_stream_fd == 0) {
2528 ret = kernel_open_metadata_stream(ksession);
2529 if (ret < 0) {
2530 ERR("Kernel create metadata stream failed");
2531 ret = LTTCOMM_KERN_STREAM_FAIL;
2532 goto error;
2533 }
2534 }
2535
2536 /* For each channel */
2537 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2538 if (kchan->stream_count == 0) {
2539 ret = kernel_open_channel_stream(kchan);
2540 if (ret < 0) {
2541 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2542 goto error;
2543 }
54d01ffb
DG
2544 /* Update the stream global counter */
2545 ksession->stream_count_global += ret;
7d29a247 2546 }
54d01ffb
DG
2547 }
2548
2549 /* Setup kernel consumer socket and send fds to it */
2550 ret = init_kernel_tracing(ksession);
2551 if (ret < 0) {
2552 ret = LTTCOMM_KERN_START_FAIL;
2553 goto error;
2554 }
2555
2556 /* This start the kernel tracing */
2557 ret = kernel_start_session(ksession);
2558 if (ret < 0) {
2559 ret = LTTCOMM_KERN_START_FAIL;
2560 goto error;
2561 }
2562
2563 /* Quiescent wait after starting trace */
2564 kernel_wait_quiescent(kernel_tracer_fd);
2565 }
2566
36dc12cc 2567 /* Flag session that trace should start automatically */
b9d9b220
DG
2568 if (usess) {
2569 usess->start_trace = 1;
36dc12cc 2570
b9d9b220
DG
2571 ret = ust_app_start_trace_all(usess);
2572 if (ret < 0) {
2573 ret = LTTCOMM_UST_START_FAIL;
2574 goto error;
2575 }
2bdd86d4 2576 }
54d01ffb
DG
2577
2578 ret = LTTCOMM_OK;
2579
2580error:
2581 return ret;
2582}
2583
2584/*
2585 * Command LTTNG_STOP_TRACE processed by the client thread.
2586 */
2587static int cmd_stop_trace(struct ltt_session *session)
2588{
2589 int ret;
2590 struct ltt_kernel_channel *kchan;
2591 struct ltt_kernel_session *ksession;
48842b30
DG
2592 //struct ltt_ust_session *usess;
2593 //struct ltt_ust_channel *ustchan;
54d01ffb
DG
2594
2595 /* Short cut */
2596 ksession = session->kernel_session;
2597
2598 /* Kernel tracer */
2599 if (ksession != NULL) {
2600 DBG("Stop kernel tracing");
2601
2602 /* Flush all buffers before stopping */
2603 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2604 if (ret < 0) {
2605 ERR("Kernel metadata flush failed");
2606 }
f34daff7 2607
54d01ffb
DG
2608 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2609 ret = kernel_flush_buffer(kchan);
0d0c377a 2610 if (ret < 0) {
54d01ffb 2611 ERR("Kernel flush buffer error");
7d29a247 2612 }
54d01ffb 2613 }
19e70852 2614
54d01ffb
DG
2615 ret = kernel_stop_session(ksession);
2616 if (ret < 0) {
2617 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2618 goto error;
f3ed775e 2619 }
54d01ffb
DG
2620
2621 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2622 }
54d01ffb 2623
48842b30 2624#ifdef DISABLE
2bdd86d4
MD
2625 /* Stop each UST session */
2626 DBG("Stop UST tracing");
48842b30 2627 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2bdd86d4 2628 /* Flush all buffers before stopping */
48842b30 2629 ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj);
2bdd86d4
MD
2630 if (ret < 0) {
2631 ERR("UST metadata flush failed");
2632 }
2633
48842b30
DG
2634 cds_list_for_each_entry(ustchan, &usess->channels.head, list) {
2635 ret = ustctl_flush_buffer(usess->sock, ustchan->obj);
2bdd86d4
MD
2636 if (ret < 0) {
2637 ERR("UST flush buffer error");
2638 }
2639 }
2640
48842b30 2641 ret = ustctl_stop_session(usess->sock, usess->handle);
2bdd86d4
MD
2642 if (ret < 0) {
2643 ret = LTTCOMM_KERN_STOP_FAIL;
2644 goto error;
2645 }
2646
48842b30 2647 ustctl_wait_quiescent(usess->sock);
2bdd86d4 2648 }
48842b30 2649#endif
54d01ffb
DG
2650
2651 ret = LTTCOMM_OK;
2652
2653error:
2654 return ret;
2655}
2656
2657/*
2658 * Command LTTNG_CREATE_SESSION processed by the client thread.
2659 */
2660static int cmd_create_session(char *name, char *path)
2661{
2662 int ret;
2663
2664 ret = session_create(name, path);
2665 if (ret != LTTCOMM_OK) {
2666 goto error;
2667 }
2668
2669 ret = LTTCOMM_OK;
2670
2671error:
2672 return ret;
2673}
2674
2675/*
2676 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2677 */
2678static int cmd_destroy_session(struct ltt_session *session, char *name)
2679{
2680 int ret;
2681
2682 /* Clean kernel session teardown */
2683 teardown_kernel_session(session);
2684
2685 /*
2686 * Must notify the kernel thread here to update it's poll setin order
2687 * to remove the channel(s)' fd just destroyed.
2688 */
2689 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2690 if (ret < 0) {
2691 perror("write kernel poll pipe");
2692 }
2693
271933a4 2694 ret = session_destroy(session);
54d01ffb
DG
2695
2696 return ret;
2697}
2698
2699/*
2700 * Command LTTNG_CALIBRATE processed by the client thread.
2701 */
2702static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2703{
2704 int ret;
2705
2706 switch (domain) {
2707 case LTTNG_DOMAIN_KERNEL:
33a2b854 2708 {
54d01ffb 2709 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2710
54d01ffb
DG
2711 kcalibrate.type = calibrate->type;
2712 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2713 if (ret < 0) {
54d01ffb
DG
2714 ret = LTTCOMM_KERN_ENABLE_FAIL;
2715 goto error;
33a2b854 2716 }
54d01ffb
DG
2717 break;
2718 }
2719 default:
2720 /* TODO: Userspace tracing */
2721 ret = LTTCOMM_NOT_IMPLEMENTED;
2722 goto error;
2723 }
33a2b854 2724
54d01ffb 2725 ret = LTTCOMM_OK;
33a2b854 2726
54d01ffb
DG
2727error:
2728 return ret;
2729}
7d29a247 2730
54d01ffb
DG
2731/*
2732 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2733 */
2734static int cmd_register_consumer(struct ltt_session *session, int domain,
2735 char *sock_path)
2736{
2737 int ret, sock;
b389abbe 2738
54d01ffb
DG
2739 switch (domain) {
2740 case LTTNG_DOMAIN_KERNEL:
2741 /* Can't register a consumer if there is already one */
2742 if (session->kernel_session->consumer_fd != 0) {
2743 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2744 goto error;
2745 }
2746
2747 sock = lttcomm_connect_unix_sock(sock_path);
2748 if (sock < 0) {
2749 ret = LTTCOMM_CONNECT_FAIL;
2750 goto error;
2751 }
2752
2753 session->kernel_session->consumer_fd = sock;
2754 break;
2755 default:
2756 /* TODO: Userspace tracing */
2757 ret = LTTCOMM_NOT_IMPLEMENTED;
2758 goto error;
2759 }
2760
2761 ret = LTTCOMM_OK;
2762
2763error:
2764 return ret;
2765}
2766
2767/*
2768 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2769 */
2770static ssize_t cmd_list_domains(struct ltt_session *session,
2771 struct lttng_domain **domains)
2772{
b551a063 2773 int ret, index = 0;
54d01ffb
DG
2774 ssize_t nb_dom = 0;
2775
2776 if (session->kernel_session != NULL) {
b551a063 2777 DBG3("Listing domains found kernel domain");
54d01ffb
DG
2778 nb_dom++;
2779 }
2780
b551a063
DG
2781 if (session->ust_session != NULL) {
2782 DBG3("Listing domains found UST global domain");
2783 nb_dom++;
2784 }
54d01ffb 2785
b551a063 2786 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
2787 if (*domains == NULL) {
2788 ret = -LTTCOMM_FATAL;
2789 goto error;
2790 }
2791
b551a063
DG
2792 if (session->kernel_session != NULL) {
2793 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2794 index++;
2795 }
2796
2797 if (session->ust_session != NULL) {
2798 (*domains)[index].type = LTTNG_DOMAIN_UST;
2799 index++;
2800 }
54d01ffb 2801
54d01ffb
DG
2802 return nb_dom;
2803
2804error:
2805 return ret;
2806}
2807
2808/*
2809 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2810 */
b551a063 2811static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
2812 struct lttng_channel **channels)
2813{
2814 int ret;
2815 ssize_t nb_chan = 0;
2816
b551a063
DG
2817 switch (domain) {
2818 case LTTNG_DOMAIN_KERNEL:
2819 if (session->kernel_session != NULL) {
2820 nb_chan = session->kernel_session->channel_count;
2821 }
2822 DBG3("Number of kernel channels %ld", nb_chan);
2823 break;
2824 case LTTNG_DOMAIN_UST:
2825 if (session->ust_session != NULL) {
2826 nb_chan = hashtable_get_count(
2827 session->ust_session->domain_global.channels);
2828 }
2829 DBG3("Number of UST global channels %ld", nb_chan);
2830 break;
2831 default:
2832 *channels = NULL;
2833 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
2834 goto error;
2835 }
2836
b551a063
DG
2837 if (nb_chan > 0) {
2838 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2839 if (*channels == NULL) {
2840 ret = -LTTCOMM_FATAL;
2841 goto error;
2842 }
54d01ffb 2843
b551a063
DG
2844 list_lttng_channels(domain, session, *channels);
2845 } else {
2846 *channels = NULL;
2847 }
2bdd86d4 2848
54d01ffb
DG
2849 return nb_chan;
2850
2851error:
2852 return ret;
2853}
2854
2855/*
2856 * Command LTTNG_LIST_EVENTS processed by the client thread.
2857 */
b551a063 2858static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
2859 char *channel_name, struct lttng_event **events)
2860{
b551a063 2861 int ret = 0;
54d01ffb 2862 ssize_t nb_event = 0;
54d01ffb 2863
b551a063
DG
2864 switch (domain) {
2865 case LTTNG_DOMAIN_KERNEL:
2866 if (session->kernel_session != NULL) {
2867 nb_event = list_lttng_kernel_events(channel_name,
2868 session->kernel_session, events);
54d01ffb 2869 }
b551a063
DG
2870 break;
2871 case LTTNG_DOMAIN_UST:
2872 {
2873 if (session->ust_session != NULL) {
2874 nb_event = list_lttng_ust_global_events(channel_name,
2875 &session->ust_session->domain_global, events);
2876 }
2877 break;
54d01ffb 2878 }
b551a063
DG
2879 default:
2880 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
2881 goto error;
2882 }
2883
b551a063 2884 ret = nb_event;
54d01ffb
DG
2885
2886error:
2887 return ret;
2888}
2889
2890/*
2891 * Process the command requested by the lttng client within the command
2892 * context structure. This function make sure that the return structure (llm)
2893 * is set and ready for transmission before returning.
2894 *
2895 * Return any error encountered or 0 for success.
2896 */
2897static int process_client_msg(struct command_ctx *cmd_ctx)
2898{
2899 int ret = LTTCOMM_OK;
44d3bd01 2900 int need_tracing_session = 1;
54d01ffb
DG
2901
2902 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2903
2904 /*
2905 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2906 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2907 * command.
2908 */
2909 switch(cmd_ctx->lsm->cmd_type) {
2910 case LTTNG_LIST_SESSIONS:
2911 case LTTNG_LIST_TRACEPOINTS:
2912 case LTTNG_LIST_DOMAINS:
2913 case LTTNG_LIST_CHANNELS:
2914 case LTTNG_LIST_EVENTS:
2915 break;
2916 default:
2917 /* Setup lttng message with no payload */
2918 ret = setup_lttng_msg(cmd_ctx, 0);
2919 if (ret < 0) {
2920 /* This label does not try to unlock the session */
2921 goto init_setup_error;
2922 }
2923 }
2924
2925 /* Commands that DO NOT need a session. */
2926 switch (cmd_ctx->lsm->cmd_type) {
2927 case LTTNG_CALIBRATE:
2928 case LTTNG_CREATE_SESSION:
2929 case LTTNG_LIST_SESSIONS:
2930 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2931 need_tracing_session = 0;
54d01ffb
DG
2932 break;
2933 default:
2934 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 2935 session_lock_list();
54d01ffb 2936 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 2937 session_unlock_list();
54d01ffb
DG
2938 if (cmd_ctx->session == NULL) {
2939 if (cmd_ctx->lsm->session.name != NULL) {
2940 ret = LTTCOMM_SESS_NOT_FOUND;
2941 } else {
2942 /* If no session name specified */
2943 ret = LTTCOMM_SELECT_SESS;
2944 }
2945 goto error;
2946 } else {
2947 /* Acquire lock for the session */
2948 session_lock(cmd_ctx->session);
2949 }
2950 break;
2951 }
b389abbe 2952
54d01ffb
DG
2953 /*
2954 * Check domain type for specific "pre-action".
2955 */
2956 switch (cmd_ctx->lsm->domain.type) {
2957 case LTTNG_DOMAIN_KERNEL:
2958 /* Kernel tracer check */
2959 if (kernel_tracer_fd == 0) {
2960 /* Basically, load kernel tracer modules */
2961 init_kernel_tracer();
2962 if (kernel_tracer_fd == 0) {
2963 ret = LTTCOMM_KERN_NA;
2964 goto error;
2965 }
2966 }
5eb91c98 2967
54d01ffb 2968 /* Need a session for kernel command */
44d3bd01 2969 if (need_tracing_session) {
54d01ffb
DG
2970 if (cmd_ctx->session->kernel_session == NULL) {
2971 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2972 if (ret < 0) {
54d01ffb 2973 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2974 goto error;
2975 }
b389abbe 2976 }
7d29a247 2977
54d01ffb 2978 /* Start the kernel consumer daemon */
3bd1e081
MD
2979 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2980 if (kconsumer_data.pid == 0 &&
54d01ffb 2981 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
2982 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2983 ret = start_consumerd(&kconsumer_data);
7d29a247 2984 if (ret < 0) {
54d01ffb
DG
2985 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2986 goto error;
950131af 2987 }
33a2b854 2988 }
3bd1e081 2989 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
0d0c377a 2990 }
54d01ffb 2991 break;
2bdd86d4 2992 case LTTNG_DOMAIN_UST:
44d3bd01 2993 {
44d3bd01 2994 if (need_tracing_session) {
f6a9efaa 2995 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
2996 ret = create_ust_session(cmd_ctx->session,
2997 &cmd_ctx->lsm->domain);
2998 if (ret != LTTCOMM_OK) {
2999 goto error;
3000 }
3001 }
2bdd86d4
MD
3002 /* Start the kernel consumer daemon */
3003 pthread_mutex_lock(&ustconsumer_data.pid_mutex);
3004 if (ustconsumer_data.pid == 0 &&
3005 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3006 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
3007 ret = start_consumerd(&ustconsumer_data);
3008 if (ret < 0) {
3009 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3010 goto error;
3011 }
48842b30
DG
3012
3013 cmd_ctx->session->ust_session->consumer_fd =
3014 ustconsumer_data.cmd_sock;
2bdd86d4
MD
3015 }
3016 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
44d3bd01
DG
3017 }
3018 break;
48842b30 3019 }
54d01ffb 3020 default:
54d01ffb
DG
3021 break;
3022 }
33a2b854 3023
54d01ffb
DG
3024 /* Process by command type */
3025 switch (cmd_ctx->lsm->cmd_type) {
3026 case LTTNG_ADD_CONTEXT:
3027 {
3028 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3029 cmd_ctx->lsm->u.context.channel_name,
3030 cmd_ctx->lsm->u.context.event_name,
3031 &cmd_ctx->lsm->u.context.ctx);
3032 break;
3033 }
3034 case LTTNG_DISABLE_CHANNEL:
3035 {
3036 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3037 cmd_ctx->lsm->u.disable.channel_name);
3038 break;
3039 }
3040 case LTTNG_DISABLE_EVENT:
3041 {
3042 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3043 cmd_ctx->lsm->u.disable.channel_name,
3044 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
3045 ret = LTTCOMM_OK;
3046 break;
3047 }
54d01ffb
DG
3048 case LTTNG_DISABLE_ALL_EVENT:
3049 {
2bdd86d4 3050 DBG("Disabling all events");
54d01ffb
DG
3051
3052 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3053 cmd_ctx->lsm->u.disable.channel_name);
3054 break;
3055 }
3056 case LTTNG_ENABLE_CHANNEL:
3057 {
44d3bd01 3058 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG
3059 &cmd_ctx->lsm->u.channel.chan);
3060 break;
3061 }
3062 case LTTNG_ENABLE_EVENT:
3063 {
3064 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3065 cmd_ctx->lsm->u.enable.channel_name,
3066 &cmd_ctx->lsm->u.enable.event);
3067 break;
3068 }
3069 case LTTNG_ENABLE_ALL_EVENT:
3070 {
2bdd86d4 3071 DBG("Enabling all events");
54d01ffb
DG
3072
3073 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
3074 cmd_ctx->lsm->u.enable.channel_name,
3075 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
3076 break;
3077 }
052da939 3078 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3079 {
9f19cc17 3080 struct lttng_event *events;
54d01ffb 3081 ssize_t nb_events;
052da939 3082
54d01ffb
DG
3083 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3084 if (nb_events < 0) {
3085 ret = -nb_events;
3086 goto error;
2ef84c95
DG
3087 }
3088
3089 /*
3090 * Setup lttng message with payload size set to the event list size in
3091 * bytes and then copy list into the llm payload.
3092 */
052da939 3093 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3094 if (ret < 0) {
052da939 3095 free(events);
2ef84c95
DG
3096 goto setup_error;
3097 }
3098
3099 /* Copy event list into message payload */
9f19cc17 3100 memcpy(cmd_ctx->llm->payload, events,
052da939 3101 sizeof(struct lttng_event) * nb_events);
2ef84c95 3102
9f19cc17 3103 free(events);
2ef84c95
DG
3104
3105 ret = LTTCOMM_OK;
3106 break;
3107 }
f3ed775e 3108 case LTTNG_START_TRACE:
8c0faa1d 3109 {
54d01ffb 3110 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
3111 break;
3112 }
f3ed775e 3113 case LTTNG_STOP_TRACE:
8c0faa1d 3114 {
54d01ffb 3115 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
3116 break;
3117 }
5e16da05
MD
3118 case LTTNG_CREATE_SESSION:
3119 {
54d01ffb
DG
3120 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3121 cmd_ctx->lsm->session.path);
5e16da05
MD
3122 break;
3123 }
3124 case LTTNG_DESTROY_SESSION:
3125 {
54d01ffb
DG
3126 ret = cmd_destroy_session(cmd_ctx->session,
3127 cmd_ctx->lsm->session.name);
5461b305 3128 break;
5e16da05 3129 }
9f19cc17 3130 case LTTNG_LIST_DOMAINS:
5e16da05 3131 {
54d01ffb
DG
3132 ssize_t nb_dom;
3133 struct lttng_domain *domains;
5461b305 3134
54d01ffb
DG
3135 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3136 if (nb_dom < 0) {
3137 ret = -nb_dom;
3138 goto error;
ce3d728c 3139 }
520ff687 3140
54d01ffb 3141 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
3142 if (ret < 0) {
3143 goto setup_error;
520ff687 3144 }
57167058 3145
54d01ffb
DG
3146 /* Copy event list into message payload */
3147 memcpy(cmd_ctx->llm->payload, domains,
3148 nb_dom * sizeof(struct lttng_domain));
3149
3150 free(domains);
5e16da05 3151
5461b305 3152 ret = LTTCOMM_OK;
5e16da05
MD
3153 break;
3154 }
9f19cc17 3155 case LTTNG_LIST_CHANNELS:
5e16da05 3156 {
54d01ffb
DG
3157 size_t nb_chan;
3158 struct lttng_channel *channels;
3159
b551a063
DG
3160 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3161 cmd_ctx->session, &channels);
54d01ffb
DG
3162 if (nb_chan < 0) {
3163 ret = -nb_chan;
3164 goto error;
5461b305 3165 }
ca95a216 3166
54d01ffb 3167 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
3168 if (ret < 0) {
3169 goto setup_error;
3170 }
9f19cc17 3171
54d01ffb
DG
3172 /* Copy event list into message payload */
3173 memcpy(cmd_ctx->llm->payload, channels,
3174 nb_chan * sizeof(struct lttng_channel));
3175
3176 free(channels);
9f19cc17
DG
3177
3178 ret = LTTCOMM_OK;
5461b305 3179 break;
5e16da05 3180 }
9f19cc17 3181 case LTTNG_LIST_EVENTS:
5e16da05 3182 {
b551a063 3183 ssize_t nb_event;
684d34d2 3184 struct lttng_event *events = NULL;
9f19cc17 3185
b551a063 3186 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
3187 cmd_ctx->lsm->u.list.channel_name, &events);
3188 if (nb_event < 0) {
3189 ret = -nb_event;
3190 goto error;
5461b305 3191 }
ca95a216 3192
54d01ffb 3193 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
3194 if (ret < 0) {
3195 goto setup_error;
3196 }
9f19cc17 3197
54d01ffb
DG
3198 /* Copy event list into message payload */
3199 memcpy(cmd_ctx->llm->payload, events,
3200 nb_event * sizeof(struct lttng_event));
9f19cc17 3201
54d01ffb 3202 free(events);
9f19cc17
DG
3203
3204 ret = LTTCOMM_OK;
5461b305 3205 break;
5e16da05
MD
3206 }
3207 case LTTNG_LIST_SESSIONS:
3208 {
54d01ffb 3209 session_lock_list();
5461b305 3210
6c9cc2ab 3211 if (session_list_ptr->count == 0) {
f3ed775e 3212 ret = LTTCOMM_NO_SESSION;
54d01ffb 3213 session_unlock_list();
5461b305 3214 goto error;
57167058 3215 }
5e16da05 3216
6c9cc2ab
DG
3217 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3218 session_list_ptr->count);
5461b305 3219 if (ret < 0) {
54d01ffb 3220 session_unlock_list();
5461b305 3221 goto setup_error;
e065084a 3222 }
5e16da05 3223
6c9cc2ab
DG
3224 /* Filled the session array */
3225 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3226
54d01ffb 3227 session_unlock_list();
5e16da05 3228
5461b305 3229 ret = LTTCOMM_OK;
5e16da05
MD
3230 break;
3231 }
d0254c7c
MD
3232 case LTTNG_CALIBRATE:
3233 {
54d01ffb
DG
3234 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3235 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
3236 break;
3237 }
d9800920
DG
3238 case LTTNG_REGISTER_CONSUMER:
3239 {
54d01ffb
DG
3240 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3241 cmd_ctx->lsm->u.reg.path);
d9800920
DG
3242 break;
3243 }
5e16da05 3244 default:
5e16da05 3245 ret = LTTCOMM_UND;
5461b305 3246 break;
fac6795d
DG
3247 }
3248
5461b305 3249error:
5461b305
DG
3250 if (cmd_ctx->llm == NULL) {
3251 DBG("Missing llm structure. Allocating one.");
894be886 3252 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
3253 goto setup_error;
3254 }
3255 }
54d01ffb 3256 /* Set return code */
5461b305 3257 cmd_ctx->llm->ret_code = ret;
5461b305 3258setup_error:
b5541356 3259 if (cmd_ctx->session) {
54d01ffb 3260 session_unlock(cmd_ctx->session);
b5541356 3261 }
54d01ffb 3262init_setup_error:
8028d920 3263 return ret;
fac6795d
DG
3264}
3265
1d4b027a 3266/*
d063d709
DG
3267 * This thread manage all clients request using the unix client socket for
3268 * communication.
1d4b027a
DG
3269 */
3270static void *thread_manage_clients(void *data)
3271{
5eb91c98
DG
3272 int sock = 0, ret, i, pollfd;
3273 uint32_t revents, nb_fd;
273ea72c 3274 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3275 struct lttng_poll_event events;
1d4b027a
DG
3276
3277 DBG("[thread] Manage client started");
3278
f6a9efaa
DG
3279 rcu_register_thread();
3280
1d4b027a
DG
3281 ret = lttcomm_listen_unix_sock(client_sock);
3282 if (ret < 0) {
3283 goto error;
3284 }
3285
5eb91c98
DG
3286 /*
3287 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3288 * more will be added to this poll set.
3289 */
3290 ret = create_thread_poll_set(&events, 2);
3291 if (ret < 0) {
3292 goto error;
3293 }
273ea72c 3294
5eb91c98
DG
3295 /* Add the application registration socket */
3296 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3297 if (ret < 0) {
3298 goto error;
3299 }
273ea72c 3300
bbd973c2
DG
3301 /*
3302 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
3303 */
3304 if (opt_sig_parent) {
3305 kill(ppid, SIGCHLD);
3306 }
3307
3308 while (1) {
1d4b027a 3309 DBG("Accepting client command ...");
273ea72c 3310
5eb91c98
DG
3311 nb_fd = LTTNG_POLL_GETNB(&events);
3312
273ea72c 3313 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3314 ret = lttng_poll_wait(&events, -1);
273ea72c 3315 if (ret < 0) {
273ea72c
DG
3316 goto error;
3317 }
3318
5eb91c98
DG
3319 for (i = 0; i < nb_fd; i++) {
3320 /* Fetch once the poll data */
3321 revents = LTTNG_POLL_GETEV(&events, i);
3322 pollfd = LTTNG_POLL_GETFD(&events, i);
3323
3324 /* Thread quit pipe has been closed. Killing thread. */
3325 ret = check_thread_quit_pipe(pollfd, revents);
3326 if (ret) {
3327 goto error;
3328 }
3329
3330 /* Event on the registration socket */
3331 if (pollfd == client_sock) {
3332 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3333 ERR("Client socket poll error");
3334 goto error;
3335 }
3336 }
3337 }
3338
3339 DBG("Wait for client response");
3340
3341 sock = lttcomm_accept_unix_sock(client_sock);
3342 if (sock < 0) {
273ea72c 3343 goto error;