lttng-sessiond: keep enabled/active state for sessions, cleanup enabled state for...
[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
ba5d816e
MD
160int ust_consumer_fd;
161
5eb91c98
DG
162/*
163 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
164 */
165static int create_thread_poll_set(struct lttng_poll_event *events,
166 unsigned int size)
167{
168 int ret;
169
170 if (events == NULL || size == 0) {
171 ret = -1;
172 goto error;
173 }
174
175 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
176 if (ret < 0) {
177 goto error;
178 }
179
180 /* Add quit pipe */
181 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
182 if (ret < 0) {
183 goto error;
184 }
185
186 return 0;
187
188error:
189 return ret;
190}
191
192/*
193 * Check if the thread quit pipe was triggered.
194 *
195 * Return 1 if it was triggered else 0;
196 */
197static int check_thread_quit_pipe(int fd, uint32_t events)
198{
199 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
200 return 1;
201 }
202
203 return 0;
204}
205
0fdd1e2c
DG
206/*
207 * Remove modules in reverse load order.
208 */
209static int modprobe_remove_kernel_modules(void)
210{
211 int ret = 0, i;
212 char modprobe[256];
213
214 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
215 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 216 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
217 kernel_modules_list[i].name);
218 if (ret < 0) {
24b487b8 219 perror("snprintf modprobe -r");
0fdd1e2c
DG
220 goto error;
221 }
222 modprobe[sizeof(modprobe) - 1] = '\0';
223 ret = system(modprobe);
224 if (ret == -1) {
24b487b8 225 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
226 kernel_modules_list[i].name);
227 } else if (kernel_modules_list[i].required
228 && WEXITSTATUS(ret) != 0) {
229 ERR("Unable to remove module %s",
230 kernel_modules_list[i].name);
231 } else {
232 DBG("Modprobe removal successful %s",
233 kernel_modules_list[i].name);
234 }
235 }
236
237error:
238 return ret;
239}
240
241/*
242 * Return group ID of the tracing group or -1 if not found.
243 */
996b65c8
MD
244static gid_t allowed_group(void)
245{
246 struct group *grp;
247
274e143b
MD
248 if (opt_tracing_group) {
249 grp = getgrnam(opt_tracing_group);
250 } else {
251 grp = getgrnam(default_tracing_group);
252 }
996b65c8
MD
253 if (!grp) {
254 return -1;
255 } else {
256 return grp->gr_gid;
257 }
258}
259
273ea72c 260/*
5eb91c98 261 * Init thread quit pipe.
273ea72c
DG
262 *
263 * Return -1 on error or 0 if all pipes are created.
264 */
265static int init_thread_quit_pipe(void)
266{
267 int ret;
268
269 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
270 if (ret < 0) {
271 perror("thread quit pipe");
272 goto error;
273 }
274
275error:
276 return ret;
277}
278
fac6795d 279/*
d063d709
DG
280 * Complete teardown of a kernel session. This free all data structure related
281 * to a kernel session and update counter.
fac6795d 282 */
1d4b027a 283static void teardown_kernel_session(struct ltt_session *session)
fac6795d 284{
1d4b027a
DG
285 if (session->kernel_session != NULL) {
286 DBG("Tearing down kernel session");
d9800920
DG
287
288 /*
289 * If a custom kernel consumer was registered, close the socket before
290 * tearing down the complete kernel session structure
291 */
3bd1e081 292 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
d9800920
DG
293 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
294 }
295
62499ad6 296 trace_kernel_destroy_session(session->kernel_session);
1d4b027a
DG
297 /* Extra precaution */
298 session->kernel_session = NULL;
fac6795d 299 }
fac6795d
DG
300}
301
f6a9efaa
DG
302/*
303 * Complete teardown of all UST sessions. This will free everything on his path
304 * and destroy the core essence of all ust sessions :)
305 */
306static void teardown_ust_session(struct ltt_session *session)
307{
308 DBG("Tearing down UST session(s)");
309
310 trace_ust_destroy_session(session->ust_session);
311}
312
099e26bd
DG
313/*
314 * Stop all threads by closing the thread quit pipe.
315 */
cf3af59e
MD
316static void stop_threads(void)
317{
5eb91c98
DG
318 int ret;
319
cf3af59e
MD
320 /* Stopping all threads */
321 DBG("Terminating all threads");
54d01ffb 322 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
323 if (ret < 0) {
324 ERR("write error on thread quit pipe");
325 }
326
099e26bd
DG
327 /* Dispatch thread */
328 dispatch_thread_exit = 1;
329 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
330}
331
fac6795d 332/*
d063d709 333 * Cleanup the daemon
fac6795d 334 */
cf3af59e 335static void cleanup(void)
fac6795d 336{
1d4b027a
DG
337 int ret;
338 char *cmd;
af9737e9 339 struct ltt_session *sess, *stmp;
fac6795d 340
1d4b027a 341 DBG("Cleaning up");
e07ae692 342
5eb91c98
DG
343 if (is_root) {
344 DBG("Removing %s directory", LTTNG_RUNDIR);
345 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
346 if (ret < 0) {
347 ERR("asprintf failed. Something is really wrong!");
348 }
5461b305 349
5eb91c98
DG
350 /* Remove lttng run directory */
351 ret = system(cmd);
352 if (ret < 0) {
353 ERR("Unable to clean " LTTNG_RUNDIR);
354 }
1d4b027a 355 }
5461b305 356
1d4b027a 357 DBG("Cleaning up all session");
fac6795d 358
b5541356 359 /* Destroy session list mutex */
273ea72c
DG
360 if (session_list_ptr != NULL) {
361 pthread_mutex_destroy(&session_list_ptr->lock);
362
363 /* Cleanup ALL session */
54d01ffb
DG
364 cds_list_for_each_entry_safe(sess, stmp,
365 &session_list_ptr->head, list) {
273ea72c 366 teardown_kernel_session(sess);
f6a9efaa
DG
367 teardown_ust_session(sess);
368 free(sess);
273ea72c
DG
369 }
370 }
371
099e26bd 372 DBG("Closing all UST sockets");
56fff090 373 ust_app_clean_list();
099e26bd 374
3bd1e081 375 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 376
f3ed775e 377 DBG("Closing kernel fd");
1d4b027a 378 close(kernel_tracer_fd);
ab147185 379
2f50c8a3
DG
380 if (is_root) {
381 DBG("Unloading kernel modules");
382 modprobe_remove_kernel_modules();
383 }
5eb91c98
DG
384
385 close(thread_quit_pipe[0]);
386 close(thread_quit_pipe[1]);
421cb601
DG
387
388 /* <fun> */
389 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
390 "Matthew, BEET driven development works!%c[%dm",
391 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
392 /* </fun> */
fac6795d
DG
393}
394
e065084a 395/*
d063d709 396 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 397 *
d063d709 398 * Return lttcomm error code.
e065084a
DG
399 */
400static int send_unix_sock(int sock, void *buf, size_t len)
401{
402 /* Check valid length */
403 if (len <= 0) {
404 return -1;
405 }
406
407 return lttcomm_send_unix_sock(sock, buf, len);
408}
409
5461b305 410/*
d063d709 411 * Free memory of a command context structure.
5461b305 412 */
a2fb29a5 413static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 414{
a2fb29a5
DG
415 DBG("Clean command context structure");
416 if (*cmd_ctx) {
417 if ((*cmd_ctx)->llm) {
418 free((*cmd_ctx)->llm);
5461b305 419 }
a2fb29a5
DG
420 if ((*cmd_ctx)->lsm) {
421 free((*cmd_ctx)->lsm);
5461b305 422 }
a2fb29a5
DG
423 free(*cmd_ctx);
424 *cmd_ctx = NULL;
5461b305
DG
425 }
426}
427
f3ed775e 428/*
d063d709 429 * Send all stream fds of kernel channel to the consumer.
f3ed775e 430 */
2bdd86d4 431static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 432 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
433{
434 int ret;
f3ed775e 435 struct ltt_kernel_stream *stream;
3bd1e081 436 struct lttcomm_consumer_msg lkm;
f3ed775e 437
3bd1e081 438 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 439 channel->channel->name);
f3ed775e 440
3bd1e081
MD
441 /* Send channel */
442 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
443 lkm.u.channel.channel_key = channel->fd;
444 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
445 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 446 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 447 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 448 if (ret < 0) {
3bd1e081 449 perror("send consumer channel");
f3ed775e
DG
450 goto error;
451 }
452
3bd1e081 453 /* Send streams */
7a485870 454 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
455 if (!stream->fd) {
456 continue;
457 }
458 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
459 lkm.u.stream.channel_key = channel->fd;
460 lkm.u.stream.stream_key = stream->fd;
461 lkm.u.stream.state = stream->state;
462 lkm.u.stream.output = channel->channel->attr.output;
463 lkm.u.stream.mmap_len = 0; /* for kernel */
464 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
465 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
466 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
467 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
468 if (ret < 0) {
469 perror("send consumer stream");
470 goto error;
471 }
472 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
473 if (ret < 0) {
474 perror("send consumer stream ancillary data");
475 goto error;
f3ed775e
DG
476 }
477 }
478
3bd1e081 479 DBG("consumer channel streams sent");
f3ed775e
DG
480
481 return 0;
482
483error:
484 return ret;
485}
486
487/*
d063d709 488 * Send all stream fds of the kernel session to the consumer.
f3ed775e 489 */
2bdd86d4 490static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 491 struct ltt_kernel_session *session)
f3ed775e
DG
492{
493 int ret;
494 struct ltt_kernel_channel *chan;
3bd1e081
MD
495 struct lttcomm_consumer_msg lkm;
496 int sock = session->consumer_fd;
7a485870
DG
497
498 DBG("Sending metadata stream fd");
499
2bdd86d4 500 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 501 if (session->consumer_fd == 0) {
3bd1e081 502 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
503 }
504
7a485870 505 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
506 /* Send metadata channel fd */
507 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
508 lkm.u.channel.channel_key = session->metadata->fd;
509 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
510 lkm.u.channel.mmap_len = 0; /* for kernel */
511 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
512 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
513 if (ret < 0) {
514 perror("send consumer channel");
515 goto error;
516 }
517
518 /* Send metadata stream fd */
519 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
520 lkm.u.stream.channel_key = session->metadata->fd;
521 lkm.u.stream.stream_key = session->metadata_stream_fd;
522 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
523 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
524 lkm.u.stream.mmap_len = 0; /* for kernel */
525 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
526 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
527 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
528 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
529 if (ret < 0) {
530 perror("send consumer stream");
531 goto error;
532 }
533 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 534 if (ret < 0) {
3bd1e081 535 perror("send consumer stream");
7a485870
DG
536 goto error;
537 }
538 }
f3ed775e 539
f3ed775e 540 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD
541 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
542 if (ret < 0) {
543 goto error;
544 }
545 }
546
547 DBG("consumer fds (metadata and channel streams) sent");
548
549 return 0;
550
551error:
552 return ret;
553}
554
fac6795d 555/*
0fdd1e2c 556 * Notify UST applications using the shm mmap futex.
fac6795d 557 */
0fdd1e2c 558static int notify_ust_apps(int active)
fac6795d 559{
0fdd1e2c 560 char *wait_shm_mmap;
fac6795d 561
0fdd1e2c 562 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 563
0fdd1e2c
DG
564 /* See shm.c for this call implying mmap, shm and futex calls */
565 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
566 if (wait_shm_mmap == NULL) {
fac6795d
DG
567 goto error;
568 }
569
0fdd1e2c
DG
570 /* Wake waiting process */
571 futex_wait_update((int32_t *) wait_shm_mmap, active);
572
573 /* Apps notified successfully */
574 return 0;
fac6795d
DG
575
576error:
0fdd1e2c 577 return -1;
fac6795d
DG
578}
579
e065084a 580/*
d063d709
DG
581 * Setup the outgoing data buffer for the response (llm) by allocating the
582 * right amount of memory and copying the original information from the lsm
583 * structure.
ca95a216 584 *
d063d709 585 * Return total size of the buffer pointed by buf.
ca95a216 586 */
5461b305 587static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 588{
f3ed775e 589 int ret, buf_size;
ca95a216 590
f3ed775e 591 buf_size = size;
5461b305 592
ba7f0ae5 593 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 594 if (cmd_ctx->llm == NULL) {
ba7f0ae5 595 perror("zmalloc");
5461b305 596 ret = -ENOMEM;
ca95a216
DG
597 goto error;
598 }
599
5461b305
DG
600 /* Copy common data */
601 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 602 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 603
5461b305
DG
604 cmd_ctx->llm->data_size = size;
605 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
606
ca95a216
DG
607 return buf_size;
608
609error:
610 return ret;
611}
612
7a485870 613/*
5eb91c98 614 * Update the kernel poll set of all channel fd available over all tracing
d063d709 615 * session. Add the wakeup pipe at the end of the set.
7a485870 616 */
5eb91c98 617static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 618{
5eb91c98 619 int ret;
7a485870
DG
620 struct ltt_session *session;
621 struct ltt_kernel_channel *channel;
622
5eb91c98 623 DBG("Updating kernel poll set");
7a485870 624
54d01ffb 625 session_lock_list();
b5541356 626 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 627 session_lock(session);
7a485870 628 if (session->kernel_session == NULL) {
54d01ffb 629 session_unlock(session);
7a485870
DG
630 continue;
631 }
7a485870 632
54d01ffb
DG
633 cds_list_for_each_entry(channel,
634 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
635 /* Add channel fd to the kernel poll set */
636 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
637 if (ret < 0) {
54d01ffb 638 session_unlock(session);
5eb91c98
DG
639 goto error;
640 }
641 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 642 }
54d01ffb 643 session_unlock(session);
7a485870 644 }
54d01ffb 645 session_unlock_list();
7a485870 646
5eb91c98 647 return 0;
7a485870
DG
648
649error:
54d01ffb 650 session_unlock_list();
7a485870
DG
651 return -1;
652}
653
654/*
54d01ffb 655 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 656 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 657 *
d063d709 658 * Useful for CPU hotplug feature.
7a485870 659 */
2bdd86d4 660static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
661{
662 int ret = 0;
663 struct ltt_session *session;
664 struct ltt_kernel_channel *channel;
665
666 DBG("Updating kernel streams for channel fd %d", fd);
667
54d01ffb 668 session_lock_list();
b5541356 669 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 670 session_lock(session);
7a485870 671 if (session->kernel_session == NULL) {
54d01ffb 672 session_unlock(session);
7a485870
DG
673 continue;
674 }
d9800920
DG
675
676 /* This is not suppose to be 0 but this is an extra security check */
677 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 678 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
679 }
680
5eb91c98
DG
681 cds_list_for_each_entry(channel,
682 &session->kernel_session->channel_list.head, list) {
7a485870
DG
683 if (channel->fd == fd) {
684 DBG("Channel found, updating kernel streams");
685 ret = kernel_open_channel_stream(channel);
686 if (ret < 0) {
b3c750d2 687 goto error;
7a485870 688 }
d9800920 689
7a485870 690 /*
5eb91c98
DG
691 * Have we already sent fds to the consumer? If yes, it means
692 * that tracing is started so it is safe to send our updated
693 * stream fds.
7a485870 694 */
3bd1e081 695 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 696 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 697 session->kernel_session->consumer_fd, channel);
7a485870 698 if (ret < 0) {
b3c750d2 699 goto error;
7a485870
DG
700 }
701 }
b3c750d2 702 goto error;
7a485870
DG
703 }
704 }
54d01ffb 705 session_unlock(session);
7a485870 706 }
54d01ffb 707 session_unlock_list();
b3c750d2 708 return ret;
7a485870 709
b3c750d2 710error:
54d01ffb
DG
711 session_unlock(session);
712 session_unlock_list();
7a485870
DG
713 return ret;
714}
715
487cf67c
DG
716/*
717 * For each tracing session, update newly registered apps.
718 */
719static void update_ust_app(int app_sock)
720{
721 struct ltt_session *sess, *stmp;
722
723 /* For all tracing session(s) */
724 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG
725 if (sess->ust_session) {
726 ust_app_global_update(sess->ust_session, app_sock);
727 }
487cf67c
DG
728 }
729}
730
7a485870 731/*
d063d709 732 * This thread manage event coming from the kernel.
7a485870 733 *
d063d709
DG
734 * Features supported in this thread:
735 * -) CPU Hotplug
7a485870
DG
736 */
737static void *thread_manage_kernel(void *data)
738{
5eb91c98
DG
739 int ret, i, pollfd, update_poll_flag = 1;
740 uint32_t revents, nb_fd;
7a485870 741 char tmp;
5eb91c98 742 struct lttng_poll_event events;
7a485870
DG
743
744 DBG("Thread manage kernel started");
745
5eb91c98
DG
746 ret = create_thread_poll_set(&events, 2);
747 if (ret < 0) {
748 goto error;
749 }
750
751 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
752 if (ret < 0) {
753 goto error;
754 }
755
7a485870
DG
756 while (1) {
757 if (update_poll_flag == 1) {
5f822d0a
DG
758 /*
759 * Reset number of fd in the poll set. Always 2 since there is the thread
760 * quit pipe and the kernel pipe.
761 */
762 events.nb_fd = 2;
763
5eb91c98
DG
764 ret = update_kernel_poll(&events);
765 if (ret < 0) {
7a485870
DG
766 goto error;
767 }
768 update_poll_flag = 0;
769 }
770
5eb91c98
DG
771 nb_fd = LTTNG_POLL_GETNB(&events);
772
773 DBG("Thread kernel polling on %d fds", nb_fd);
774
775 /* Zeroed the poll events */
776 lttng_poll_reset(&events);
7a485870
DG
777
778 /* Poll infinite value of time */
5eb91c98 779 ret = lttng_poll_wait(&events, -1);
7a485870 780 if (ret < 0) {
7a485870
DG
781 goto error;
782 } else if (ret == 0) {
783 /* Should not happen since timeout is infinite */
85611738
DG
784 ERR("Return value of poll is 0 with an infinite timeout.\n"
785 "This should not have happened! Continuing...");
7a485870
DG
786 continue;
787 }
788
5eb91c98
DG
789 for (i = 0; i < nb_fd; i++) {
790 /* Fetch once the poll data */
791 revents = LTTNG_POLL_GETEV(&events, i);
792 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 793
5eb91c98
DG
794 /* Thread quit pipe has been closed. Killing thread. */
795 ret = check_thread_quit_pipe(pollfd, revents);
796 if (ret) {
797 goto error;
798 }
7a485870 799
5eb91c98
DG
800 /* Check for data on kernel pipe */
801 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
802 ret = read(kernel_poll_pipe[0], &tmp, 1);
803 update_poll_flag = 1;
804 continue;
805 } else {
806 /*
807 * New CPU detected by the kernel. Adding kernel stream to
808 * kernel session and updating the kernel consumer
809 */
810 if (revents & LPOLLIN) {
2bdd86d4 811 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
812 if (ret < 0) {
813 continue;
814 }
815 break;
816 /*
817 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
818 * and unregister kernel stream at this point.
819 */
7a485870 820 }
7a485870
DG
821 }
822 }
823 }
824
825error:
826 DBG("Kernel thread dying");
273ea72c
DG
827 close(kernel_poll_pipe[0]);
828 close(kernel_poll_pipe[1]);
5eb91c98
DG
829
830 lttng_poll_clean(&events);
831
7a485870
DG
832 return NULL;
833}
834
1d4b027a 835/*
3bd1e081 836 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 837 */
3bd1e081 838static void *thread_manage_consumer(void *data)
1d4b027a 839{
5eb91c98
DG
840 int sock = 0, i, ret, pollfd;
841 uint32_t revents, nb_fd;
1d4b027a 842 enum lttcomm_return_code code;
5eb91c98 843 struct lttng_poll_event events;
3bd1e081 844 struct consumer_data *consumer_data = data;
1d4b027a 845
3bd1e081 846 DBG("[thread] Manage consumer started");
1d4b027a 847
3bd1e081 848 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
849 if (ret < 0) {
850 goto error;
851 }
852
5eb91c98
DG
853 /*
854 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
855 * Nothing more will be added to this poll set.
856 */
857 ret = create_thread_poll_set(&events, 2);
858 if (ret < 0) {
859 goto error;
860 }
273ea72c 861
3bd1e081 862 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
863 if (ret < 0) {
864 goto error;
865 }
866
867 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
868
869 /* Inifinite blocking call, waiting for transmission */
5eb91c98 870 ret = lttng_poll_wait(&events, -1);
273ea72c 871 if (ret < 0) {
273ea72c
DG
872 goto error;
873 }
874
5eb91c98
DG
875 for (i = 0; i < nb_fd; i++) {
876 /* Fetch once the poll data */
877 revents = LTTNG_POLL_GETEV(&events, i);
878 pollfd = LTTNG_POLL_GETFD(&events, i);
879
880 /* Thread quit pipe has been closed. Killing thread. */
881 ret = check_thread_quit_pipe(pollfd, revents);
882 if (ret) {
883 goto error;
884 }
885
886 /* Event on the registration socket */
3bd1e081 887 if (pollfd == consumer_data->err_sock) {
5eb91c98 888 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 889 ERR("consumer err socket poll error");
5eb91c98
DG
890 goto error;
891 }
892 }
273ea72c
DG
893 }
894
3bd1e081 895 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
896 if (sock < 0) {
897 goto error;
898 }
899
3bd1e081 900 DBG2("Receiving code from consumer err_sock");
ee0b0061 901
712ea556 902 /* Getting status code from kconsumerd */
54d01ffb
DG
903 ret = lttcomm_recv_unix_sock(sock, &code,
904 sizeof(enum lttcomm_return_code));
1d4b027a
DG
905 if (ret <= 0) {
906 goto error;
907 }
908
3bd1e081
MD
909 if (code == CONSUMERD_COMMAND_SOCK_READY) {
910 consumer_data->cmd_sock =
911 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
912 if (consumer_data->cmd_sock < 0) {
913 sem_post(&consumer_data->sem);
48842b30 914 PERROR("consumer connect");
1d4b027a
DG
915 goto error;
916 }
917 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
918 sem_post(&consumer_data->sem);
919 DBG("consumer command socket ready");
1d4b027a 920 } else {
3bd1e081 921 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
922 lttcomm_get_readable_code(-code));
923 goto error;
924 }
925
54d01ffb 926 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 927 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 928 if (ret < 0) {
72079cae
DG
929 goto error;
930 }
931
5eb91c98
DG
932 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
933 if (ret < 0) {
72079cae 934 goto error;
5eb91c98
DG
935 }
936
937 /* Update number of fd */
938 nb_fd = LTTNG_POLL_GETNB(&events);
939
940 /* Inifinite blocking call, waiting for transmission */
941 ret = lttng_poll_wait(&events, -1);
942 if (ret < 0) {
72079cae
DG
943 goto error;
944 }
945
5eb91c98
DG
946 for (i = 0; i < nb_fd; i++) {
947 /* Fetch once the poll data */
948 revents = LTTNG_POLL_GETEV(&events, i);
949 pollfd = LTTNG_POLL_GETFD(&events, i);
950
951 /* Thread quit pipe has been closed. Killing thread. */
952 ret = check_thread_quit_pipe(pollfd, revents);
953 if (ret) {
954 goto error;
955 }
956
957 /* Event on the kconsumerd socket */
958 if (pollfd == sock) {
959 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 960 ERR("consumer err socket second poll error");
5eb91c98
DG
961 goto error;
962 }
963 }
964 }
965
712ea556 966 /* Wait for any kconsumerd error */
54d01ffb
DG
967 ret = lttcomm_recv_unix_sock(sock, &code,
968 sizeof(enum lttcomm_return_code));
712ea556 969 if (ret <= 0) {
3bd1e081 970 ERR("consumer closed the command socket");
712ea556 971 goto error;
6f61d021 972 }
1d4b027a 973
3bd1e081 974 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 975
1d4b027a 976error:
3bd1e081
MD
977 DBG("consumer thread dying");
978 close(consumer_data->err_sock);
979 close(consumer_data->cmd_sock);
5eb91c98 980 close(sock);
273ea72c 981
3bd1e081
MD
982 unlink(consumer_data->err_unix_sock_path);
983 unlink(consumer_data->cmd_unix_sock_path);
984 consumer_data->pid = 0;
1d4b027a 985
5eb91c98 986 lttng_poll_clean(&events);
0177d773 987
5eb91c98 988 return NULL;
099e26bd
DG
989}
990
099e26bd
DG
991/*
992 * This thread manage application communication.
1d4b027a
DG
993 */
994static void *thread_manage_apps(void *data)
099e26bd 995{
5eb91c98
DG
996 int i, ret, pollfd;
997 uint32_t revents, nb_fd;
099e26bd 998 struct ust_command ust_cmd;
5eb91c98 999 struct lttng_poll_event events;
099e26bd
DG
1000
1001 DBG("[thread] Manage application started");
1002
f6a9efaa
DG
1003 rcu_register_thread();
1004 rcu_thread_online();
1005
5eb91c98
DG
1006 ret = create_thread_poll_set(&events, 2);
1007 if (ret < 0) {
1008 goto error;
1009 }
099e26bd 1010
5eb91c98
DG
1011 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1012 if (ret < 0) {
1013 goto error;
1014 }
099e26bd 1015
5eb91c98
DG
1016 while (1) {
1017 /* Zeroed the events structure */
1018 lttng_poll_reset(&events);
0177d773 1019
5eb91c98 1020 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1021
1022 DBG("Apps thread polling on %d fds", nb_fd);
1023
1024 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1025 ret = lttng_poll_wait(&events, -1);
099e26bd 1026 if (ret < 0) {
099e26bd
DG
1027 goto error;
1028 }
1029
5eb91c98
DG
1030 for (i = 0; i < nb_fd; i++) {
1031 /* Fetch once the poll data */
1032 revents = LTTNG_POLL_GETEV(&events, i);
1033 pollfd = LTTNG_POLL_GETFD(&events, i);
1034
1035 /* Thread quit pipe has been closed. Killing thread. */
1036 ret = check_thread_quit_pipe(pollfd, revents);
1037 if (ret) {
099e26bd 1038 goto error;
5eb91c98 1039 }
099e26bd 1040
5eb91c98
DG
1041 /* Inspect the apps cmd pipe */
1042 if (pollfd == apps_cmd_pipe[0]) {
1043 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1044 ERR("Apps command pipe error");
0177d773 1045 goto error;
5eb91c98
DG
1046 } else if (revents & LPOLLIN) {
1047 /* Empty pipe */
1048 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1049 if (ret < 0 || ret < sizeof(ust_cmd)) {
1050 perror("read apps cmd pipe");
1051 goto error;
1052 }
099e26bd 1053
5eb91c98 1054 /* Register applicaton to the session daemon */
56fff090 1055 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1056 ust_cmd.sock);
5eb91c98
DG
1057 if (ret < 0) {
1058 /* Only critical ENOMEM error can be returned here */
1059 goto error;
1060 }
1061
acc7b41b
MD
1062 /*
1063 * Add channel(s) and event(s) to newly registered apps
1064 * from lttng global UST domain.
1065 */
1066 update_ust_app(ust_cmd.sock);
1067
5eb91c98
DG
1068 ret = ustctl_register_done(ust_cmd.sock);
1069 if (ret < 0) {
1070 /*
1071 * If the registration is not possible, we simply
1072 * unregister the apps and continue
1073 */
56fff090 1074 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1075 } else {
1076 /*
1077 * We just need here to monitor the close of the UST
1078 * socket and poll set monitor those by default.
1079 */
1080 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1081 if (ret < 0) {
1082 goto error;
1083 }
1084
54d01ffb
DG
1085 DBG("Apps with sock %d added to poll set",
1086 ust_cmd.sock);
5eb91c98 1087 }
487cf67c 1088
5eb91c98 1089 break;
0177d773 1090 }
5eb91c98
DG
1091 } else {
1092 /*
54d01ffb
DG
1093 * At this point, we know that a registered application made
1094 * the event at poll_wait.
5eb91c98
DG
1095 */
1096 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1097 /* Removing from the poll set */
1098 ret = lttng_poll_del(&events, pollfd);
1099 if (ret < 0) {
1100 goto error;
1101 }
099e26bd 1102
b9d9b220 1103 /* Socket closed on remote end. */
56fff090 1104 ust_app_unregister(pollfd);
5eb91c98
DG
1105 break;
1106 }
099e26bd
DG
1107 }
1108 }
099e26bd
DG
1109 }
1110
1111error:
1112 DBG("Application communication apps dying");
1113 close(apps_cmd_pipe[0]);
1114 close(apps_cmd_pipe[1]);
1115
5eb91c98 1116 lttng_poll_clean(&events);
099e26bd 1117
f6a9efaa
DG
1118 rcu_thread_offline();
1119 rcu_unregister_thread();
099e26bd
DG
1120 return NULL;
1121}
1122
1123/*
1124 * Dispatch request from the registration threads to the application
1125 * communication thread.
1126 */
1127static void *thread_dispatch_ust_registration(void *data)
1128{
1129 int ret;
1130 struct cds_wfq_node *node;
1131 struct ust_command *ust_cmd = NULL;
1132
1133 DBG("[thread] Dispatch UST command started");
1134
1135 while (!dispatch_thread_exit) {
1136 /* Atomically prepare the queue futex */
1137 futex_nto1_prepare(&ust_cmd_queue.futex);
1138
1139 do {
1140 /* Dequeue command for registration */
1141 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1142 if (node == NULL) {
00a17c97 1143 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1144 /* Continue thread execution */
1145 break;
1146 }
1147
1148 ust_cmd = caa_container_of(node, struct ust_command, node);
1149
2f50c8a3
DG
1150 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1151 " gid:%d sock:%d name:%s (version %d.%d)",
1152 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1153 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1154 ust_cmd->sock, ust_cmd->reg_msg.name,
1155 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1156 /*
1157 * Inform apps thread of the new application registration. This
1158 * call is blocking so we can be assured that the data will be read
1159 * at some point in time or wait to the end of the world :)
1160 */
1161 ret = write(apps_cmd_pipe[1], ust_cmd,
1162 sizeof(struct ust_command));
1163 if (ret < 0) {
1164 perror("write apps cmd pipe");
1165 if (errno == EBADF) {
1166 /*
1167 * We can't inform the application thread to process
1168 * registration. We will exit or else application
1169 * registration will not occur and tracing will never
1170 * start.
1171 */
1172 goto error;
1173 }
1174 }
1175 free(ust_cmd);
1176 } while (node != NULL);
1177
1178 /* Futex wait on queue. Blocking call on futex() */
1179 futex_nto1_wait(&ust_cmd_queue.futex);
1180 }
1181
1182error:
1183 DBG("Dispatch thread dying");
1184 return NULL;
1185}
1186
1187/*
1188 * This thread manage application registration.
1189 */
1190static void *thread_registration_apps(void *data)
1d4b027a 1191{
5eb91c98
DG
1192 int sock = 0, i, ret, pollfd;
1193 uint32_t revents, nb_fd;
1194 struct lttng_poll_event events;
099e26bd
DG
1195 /*
1196 * Get allocated in this thread, enqueued to a global queue, dequeued and
1197 * freed in the manage apps thread.
1198 */
1199 struct ust_command *ust_cmd = NULL;
1d4b027a 1200
099e26bd 1201 DBG("[thread] Manage application registration started");
1d4b027a
DG
1202
1203 ret = lttcomm_listen_unix_sock(apps_sock);
1204 if (ret < 0) {
1205 goto error;
1206 }
1207
5eb91c98
DG
1208 /*
1209 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1210 * more will be added to this poll set.
1211 */
1212 ret = create_thread_poll_set(&events, 2);
1213 if (ret < 0) {
1214 goto error;
1215 }
273ea72c 1216
5eb91c98
DG
1217 /* Add the application registration socket */
1218 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1219 if (ret < 0) {
1220 goto error;
1221 }
273ea72c 1222
1d4b027a 1223 /* Notify all applications to register */
0fdd1e2c
DG
1224 ret = notify_ust_apps(1);
1225 if (ret < 0) {
1226 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1227 "Execution continues but there might be problem for already\n"
1228 "running applications that wishes to register.");
0fdd1e2c 1229 }
1d4b027a
DG
1230
1231 while (1) {
1232 DBG("Accepting application registration");
273ea72c 1233
5eb91c98
DG
1234 nb_fd = LTTNG_POLL_GETNB(&events);
1235
273ea72c 1236 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1237 ret = lttng_poll_wait(&events, -1);
273ea72c 1238 if (ret < 0) {
273ea72c
DG
1239 goto error;
1240 }
1241
5eb91c98
DG
1242 for (i = 0; i < nb_fd; i++) {
1243 /* Fetch once the poll data */
1244 revents = LTTNG_POLL_GETEV(&events, i);
1245 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1246
5eb91c98
DG
1247 /* Thread quit pipe has been closed. Killing thread. */
1248 ret = check_thread_quit_pipe(pollfd, revents);
1249 if (ret) {
90014c57
DG
1250 goto error;
1251 }
1d4b027a 1252
5eb91c98
DG
1253 /* Event on the registration socket */
1254 if (pollfd == apps_sock) {
1255 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1256 ERR("Register apps socket poll error");
1257 goto error;
1258 } else if (revents & LPOLLIN) {
1259 sock = lttcomm_accept_unix_sock(apps_sock);
1260 if (sock < 0) {
1261 goto error;
1262 }
099e26bd 1263
5eb91c98 1264 /* Create UST registration command for enqueuing */
ba7f0ae5 1265 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1266 if (ust_cmd == NULL) {
ba7f0ae5 1267 perror("ust command zmalloc");
5eb91c98
DG
1268 goto error;
1269 }
1d4b027a 1270
5eb91c98
DG
1271 /*
1272 * Using message-based transmissions to ensure we don't
1273 * have to deal with partially received messages.
1274 */
1275 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1276 sizeof(struct ust_register_msg));
1277 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1278 if (ret < 0) {
1279 perror("lttcomm_recv_unix_sock register apps");
1280 } else {
1281 ERR("Wrong size received on apps register");
1282 }
1283 free(ust_cmd);
1284 close(sock);
1285 continue;
1286 }
099e26bd 1287
5eb91c98 1288 ust_cmd->sock = sock;
099e26bd 1289
5eb91c98
DG
1290 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1291 " gid:%d sock:%d name:%s (version %d.%d)",
1292 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1293 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1294 ust_cmd->sock, ust_cmd->reg_msg.name,
1295 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1296
5eb91c98
DG
1297 /*
1298 * Lock free enqueue the registration request. The red pill
54d01ffb 1299 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1300 */
1301 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1302
1303 /*
1304 * Wake the registration queue futex. Implicit memory
1305 * barrier with the exchange in cds_wfq_enqueue.
1306 */
1307 futex_nto1_wake(&ust_cmd_queue.futex);
1308 }
1309 }
90014c57 1310 }
1d4b027a
DG
1311 }
1312
1313error:
0fdd1e2c
DG
1314 DBG("UST Registration thread dying");
1315
1316 /* Notify that the registration thread is gone */
1317 notify_ust_apps(0);
1318
1319 close(apps_sock);
1320 close(sock);
273ea72c 1321 unlink(apps_unix_sock_path);
0fdd1e2c 1322
5eb91c98
DG
1323 lttng_poll_clean(&events);
1324
1d4b027a
DG
1325 return NULL;
1326}
1327
8c0faa1d 1328/*
3bd1e081 1329 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1330 * exec or it will fails.
8c0faa1d 1331 */
3bd1e081 1332static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1333{
1334 int ret;
ee0b0061
DG
1335 struct timespec timeout;
1336
1337 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1338 timeout.tv_nsec = 0;
8c0faa1d
DG
1339
1340 /* Setup semaphore */
3bd1e081 1341 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1342 if (ret < 0) {
3bd1e081 1343 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1344 goto error;
1345 }
8c0faa1d 1346
3bd1e081
MD
1347 ret = pthread_create(&consumer_data->thread, NULL,
1348 thread_manage_consumer, consumer_data);
8c0faa1d 1349 if (ret != 0) {
3bd1e081 1350 PERROR("pthread_create consumer");
ee0b0061 1351 ret = -1;
8c0faa1d
DG
1352 goto error;
1353 }
1354
ee0b0061
DG
1355 /* Get time for sem_timedwait absolute timeout */
1356 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1357 if (ret < 0) {
3bd1e081 1358 PERROR("clock_gettime spawn consumer");
ee0b0061 1359 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1360 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1361 } else {
1362 /* Normal timeout if the gettime was successful */
1363 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1364 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1365 }
8c0faa1d 1366
ee0b0061
DG
1367 if (ret < 0) {
1368 if (errno == ETIMEDOUT) {
1369 /*
1370 * Call has timed out so we kill the kconsumerd_thread and return
1371 * an error.
1372 */
3bd1e081
MD
1373 ERR("The consumer thread was never ready. Killing it");
1374 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1375 if (ret < 0) {
3bd1e081 1376 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1377 }
1378 } else {
3bd1e081 1379 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1380 }
1381 goto error;
1382 }
1383
3bd1e081
MD
1384 pthread_mutex_lock(&consumer_data->pid_mutex);
1385 if (consumer_data->pid == 0) {
712ea556 1386 ERR("Kconsumerd did not start");
3bd1e081 1387 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1388 goto error;
1389 }
3bd1e081 1390 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1391
8c0faa1d
DG
1392 return 0;
1393
1394error:
1395 return ret;
1396}
1397
d9800920 1398/*
3bd1e081 1399 * Join consumer thread
d9800920 1400 */
3bd1e081 1401static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1402{
1403 void *status;
1404 int ret;
1405
3bd1e081
MD
1406 if (consumer_data->pid != 0) {
1407 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1408 if (ret) {
3bd1e081 1409 ERR("Error killing consumer daemon");
cf3af59e
MD
1410 return ret;
1411 }
3bd1e081 1412 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1413 } else {
1414 return 0;
1415 }
1416}
1417
8c0faa1d 1418/*
3bd1e081 1419 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1420 *
d063d709 1421 * Return pid if successful else -1.
8c0faa1d 1422 */
3bd1e081 1423static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1424{
1425 int ret;
1426 pid_t pid;
53086306 1427 const char *verbosity;
8c0faa1d 1428
3bd1e081 1429 DBG("Spawning consumerd");
c49dc785 1430
8c0faa1d
DG
1431 pid = fork();
1432 if (pid == 0) {
1433 /*
3bd1e081 1434 * Exec consumerd.
8c0faa1d 1435 */
3bd1e081 1436 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG
1437 verbosity = "--verbose";
1438 } else {
1439 verbosity = "--quiet";
1440 }
3bd1e081
MD
1441 switch (consumer_data->type) {
1442 case LTTNG_CONSUMER_KERNEL:
1443 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1444 "lttng-consumerd", verbosity, "-k", NULL);
1445 break;
1446 case LTTNG_CONSUMER_UST:
1447 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1448 "lttng-consumerd", verbosity, "-u", NULL);
1449 break;
1450 default:
1451 perror("unknown consumer type");
1452 exit(EXIT_FAILURE);
1453 }
8c0faa1d
DG
1454 if (errno != 0) {
1455 perror("kernel start consumer exec");
1456 }
1457 exit(EXIT_FAILURE);
1458 } else if (pid > 0) {
1459 ret = pid;
8c0faa1d 1460 } else {
3bd1e081 1461 perror("start consumer fork");
8c0faa1d 1462 ret = -errno;
8c0faa1d 1463 }
8c0faa1d
DG
1464 return ret;
1465}
1466
693bd40b 1467/*
3bd1e081 1468 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1469 */
3bd1e081 1470static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1471{
1472 int ret;
1473
3bd1e081
MD
1474 pthread_mutex_lock(&consumer_data->pid_mutex);
1475 if (consumer_data->pid != 0) {
1476 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1477 goto end;
1478 }
693bd40b 1479
3bd1e081 1480 ret = spawn_consumerd(consumer_data);
c49dc785 1481 if (ret < 0) {
3bd1e081
MD
1482 ERR("Spawning consumerd failed");
1483 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1484 goto error;
693bd40b 1485 }
c49dc785 1486
3bd1e081
MD
1487 /* Setting up the consumer_data pid */
1488 consumer_data->pid = ret;
48842b30 1489 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1490 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1491
3bd1e081
MD
1492 DBG2("Spawning consumer control thread");
1493 ret = spawn_consumer_thread(consumer_data);
693bd40b 1494 if (ret < 0) {
3bd1e081 1495 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1496 goto error;
1497 }
1498
c49dc785 1499end:
693bd40b
DG
1500 return 0;
1501
1502error:
1503 return ret;
1504}
1505
b73401da 1506/*
d063d709 1507 * modprobe_kernel_modules
b73401da
DG
1508 */
1509static int modprobe_kernel_modules(void)
1510{
ab147185 1511 int ret = 0, i;
b73401da
DG
1512 char modprobe[256];
1513
ab147185
MD
1514 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1515 ret = snprintf(modprobe, sizeof(modprobe),
1516 "/sbin/modprobe %s%s",
24b487b8 1517 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1518 kernel_modules_list[i].name);
b73401da
DG
1519 if (ret < 0) {
1520 perror("snprintf modprobe");
1521 goto error;
1522 }
ab147185 1523 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1524 ret = system(modprobe);
ab147185
MD
1525 if (ret == -1) {
1526 ERR("Unable to launch modprobe for module %s",
1527 kernel_modules_list[i].name);
1528 } else if (kernel_modules_list[i].required
d9800920 1529 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1530 ERR("Unable to load module %s",
1531 kernel_modules_list[i].name);
1532 } else {
1533 DBG("Modprobe successfully %s",
1534 kernel_modules_list[i].name);
1535 }
1536 }
1537
1538error:
1539 return ret;
1540}
1541
b73401da 1542/*
d063d709 1543 * mount_debugfs
b73401da
DG
1544 */
1545static int mount_debugfs(char *path)
1546{
1547 int ret;
1548 char *type = "debugfs";
1549
996b65c8 1550 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1551 if (ret < 0) {
7272acf5 1552 PERROR("Cannot create debugfs path");
b73401da
DG
1553 goto error;
1554 }
1555
1556 ret = mount(type, path, type, 0, NULL);
1557 if (ret < 0) {
7272acf5 1558 PERROR("Cannot mount debugfs");
b73401da
DG
1559 goto error;
1560 }
1561
1562 DBG("Mounted debugfs successfully at %s", path);
1563
1564error:
1565 return ret;
1566}
1567
8c0faa1d 1568/*
d063d709 1569 * Setup necessary data for kernel tracer action.
8c0faa1d 1570 */
f3ed775e 1571static void init_kernel_tracer(void)
8c0faa1d 1572{
b73401da
DG
1573 int ret;
1574 char *proc_mounts = "/proc/mounts";
1575 char line[256];
684d34d2 1576 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1577 FILE *fp;
1578
1579 /* Detect debugfs */
1580 fp = fopen(proc_mounts, "r");
1581 if (fp == NULL) {
1582 ERR("Unable to probe %s", proc_mounts);
1583 goto error;
1584 }
1585
1586 while (fgets(line, sizeof(line), fp) != NULL) {
1587 if (strstr(line, "debugfs") != NULL) {
1588 /* Remove first string */
1589 strtok(line, " ");
1590 /* Dup string here so we can reuse line later on */
1591 debugfs_path = strdup(strtok(NULL, " "));
1592 DBG("Got debugfs path : %s", debugfs_path);
1593 break;
1594 }
1595 }
1596
1597 fclose(fp);
1598
1599 /* Mount debugfs if needded */
1600 if (debugfs_path == NULL) {
1601 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1602 if (ret < 0) {
1603 perror("asprintf debugfs path");
1604 goto error;
1605 }
1606 ret = mount_debugfs(debugfs_path);
1607 if (ret < 0) {
7272acf5 1608 perror("Cannot mount debugfs");
b73401da
DG
1609 goto error;
1610 }
1611 }
1612
1613 /* Modprobe lttng kernel modules */
1614 ret = modprobe_kernel_modules();
1615 if (ret < 0) {
1616 goto error;
1617 }
1618
1619 /* Setup lttng kernel path */
1620 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1621 if (ret < 0) {
1622 perror("asprintf lttng path");
1623 goto error;
1624 }
1625
1626 /* Open debugfs lttng */
1627 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1628 if (kernel_tracer_fd < 0) {
b73401da
DG
1629 DBG("Failed to open %s", lttng_path);
1630 goto error;
8c0faa1d
DG
1631 }
1632
b73401da
DG
1633 free(lttng_path);
1634 free(debugfs_path);
f3ed775e 1635 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1636 return;
1637
1638error:
1639 if (lttng_path) {
1640 free(lttng_path);
1641 }
1642 if (debugfs_path) {
1643 free(debugfs_path);
1644 }
1645 WARN("No kernel tracer available");
1646 kernel_tracer_fd = 0;
1647 return;
f3ed775e 1648}
33a2b854 1649
f3ed775e 1650/*
54d01ffb 1651 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1652 */
54d01ffb 1653static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1654{
f40799e8 1655 int ret = 0;
8c0faa1d 1656
3bd1e081 1657 if (session->consumer_fds_sent == 0) {
d9800920 1658 /*
54d01ffb
DG
1659 * Assign default kernel consumer socket if no consumer assigned to the
1660 * kernel session. At this point, it's NOT suppose to be 0 but this is
1661 * an extra security check.
d9800920
DG
1662 */
1663 if (session->consumer_fd == 0) {
3bd1e081 1664 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1665 }
1666
2bdd86d4 1667 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1668 if (ret < 0) {
f3ed775e
DG
1669 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1670 goto error;
1671 }
1d4b027a 1672
3bd1e081 1673 session->consumer_fds_sent = 1;
f3ed775e 1674 }
1d4b027a
DG
1675
1676error:
1677 return ret;
8c0faa1d
DG
1678}
1679
0177d773
DG
1680/*
1681 * Create an UST session and add it to the session ust list.
1682 */
44d3bd01
DG
1683static int create_ust_session(struct ltt_session *session,
1684 struct lttng_domain *domain)
0177d773 1685{
44d3bd01 1686 int ret;
48842b30 1687 unsigned int uid;
13384287 1688 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1689
1690 switch (domain->type) {
48842b30 1691 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1692 break;
1693 default:
13384287 1694 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1695 goto error;
1696 }
0177d773
DG
1697
1698 DBG("Creating UST session");
1699
48842b30
DG
1700 session_lock_list();
1701 uid = session_list_ptr->count;
1702 session_unlock_list();
1703
1704 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1705 if (lus == NULL) {
44d3bd01 1706 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1707 goto error;
1708 }
1709
48842b30 1710 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG
1711 geteuid(), allowed_group());
1712 if (ret < 0) {
1713 if (ret != -EEXIST) {
1714 ERR("Trace directory creation error");
44d3bd01 1715 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1716 goto error;
1717 }
1718 }
1719
f6a9efaa
DG
1720 /* The domain type dictate different actions on session creation */
1721 switch (domain->type) {
48842b30
DG
1722 case LTTNG_DOMAIN_UST:
1723 /* No ustctl for the global UST domain */
1724 break;
1725 default:
36dc12cc 1726 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1727 goto error;
0177d773 1728 }
f6a9efaa 1729 session->ust_session = lus;
44d3bd01
DG
1730
1731 return LTTCOMM_OK;
0177d773
DG
1732
1733error:
1734 free(lus);
1735 return ret;
1736}
1737
333f285e 1738/*
d063d709 1739 * Create a kernel tracer session then create the default channel.
333f285e 1740 */
f3ed775e 1741static int create_kernel_session(struct ltt_session *session)
333f285e 1742{
f3ed775e 1743 int ret;
f3ed775e
DG
1744
1745 DBG("Creating kernel session");
1746
1747 ret = kernel_create_session(session, kernel_tracer_fd);
1748 if (ret < 0) {
1749 ret = LTTCOMM_KERN_SESS_FAIL;
1750 goto error;
333f285e
DG
1751 }
1752
d9800920 1753 /* Set kernel consumer socket fd */
3bd1e081
MD
1754 if (kconsumer_data.cmd_sock) {
1755 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1756 }
1757
63053e7c
DG
1758 ret = mkdir_recursive(session->kernel_session->trace_path,
1759 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1760 if (ret < 0) {
996b65c8 1761 if (ret != -EEXIST) {
7a485870
DG
1762 ERR("Trace directory creation error");
1763 goto error;
1764 }
1765 }
1766
f3ed775e
DG
1767error:
1768 return ret;
333f285e
DG
1769}
1770
6c9cc2ab
DG
1771/*
1772 * Using the session list, filled a lttng_session array to send back to the
1773 * client for session listing.
1774 *
1775 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1776 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1777 */
1778static void list_lttng_sessions(struct lttng_session *sessions)
1779{
1780 int i = 0;
1781 struct ltt_session *session;
1782
1783 DBG("Getting all available session");
1784 /*
1785 * Iterate over session list and append data after the control struct in
1786 * the buffer.
1787 */
1788 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1789 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1790 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1791 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1792 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1793 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
1794 i++;
1795 }
1796}
1797
9f19cc17
DG
1798/*
1799 * Fill lttng_channel array of all channels.
1800 */
b551a063 1801static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
1802 struct lttng_channel *channels)
1803{
1804 int i = 0;
1805 struct ltt_kernel_channel *kchan;
1806
1807 DBG("Listing channels for session %s", session->name);
1808
b551a063
DG
1809 switch (domain) {
1810 case LTTNG_DOMAIN_KERNEL:
1811 /* Kernel channels */
1812 if (session->kernel_session != NULL) {
1813 cds_list_for_each_entry(kchan,
1814 &session->kernel_session->channel_list.head, list) {
1815 /* Copy lttng_channel struct to array */
1816 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1817 channels[i].enabled = kchan->enabled;
1818 i++;
1819 }
1820 }
1821 break;
1822 case LTTNG_DOMAIN_UST:
1823 {
1824 struct cds_lfht_iter iter;
1825 struct ltt_ust_channel *uchan;
1826
1827 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1828 &iter, uchan, node) {
1829 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1830 channels[i].attr.overwrite = uchan->attr.overwrite;
1831 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1832 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1833 channels[i].attr.switch_timer_interval =
1834 uchan->attr.switch_timer_interval;
1835 channels[i].attr.read_timer_interval =
1836 uchan->attr.read_timer_interval;
1837 channels[i].attr.output = uchan->attr.output;
1838 }
1839 break;
1840 }
1841 default:
1842 break;
1843 }
1844}
1845
1846/*
1847 * Create a list of ust global domain events.
1848 */
1849static int list_lttng_ust_global_events(char *channel_name,
1850 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1851{
1852 int i = 0, ret = 0;
1853 unsigned int nb_event = 0;
1854 struct cds_lfht_iter iter;
1855 struct ltt_ust_channel *uchan;
1856 struct ltt_ust_event *uevent;
1857 struct lttng_event *tmp;
1858
1859 DBG("Listing UST global events for channel %s", channel_name);
1860
1861 rcu_read_lock();
1862
1863 /* Count events in all channels */
1864 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1865 nb_event += hashtable_get_count(uchan->events);
1866 }
1867
1868 if (nb_event == 0) {
1869 ret = nb_event;
1870 goto error;
1871 }
1872
1873 DBG3("Listing UST global %d events", nb_event);
1874
1875 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
1876 if (tmp == NULL) {
1877 ret = -LTTCOMM_FATAL;
1878 goto error;
1879 }
1880
1881 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1882 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
1883 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
1884 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
37357452 1885 tmp[i].enabled = uevent->enabled;
b551a063
DG
1886 switch (uevent->attr.instrumentation) {
1887 case LTTNG_UST_TRACEPOINT:
1888 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
1889 break;
1890 case LTTNG_UST_PROBE:
1891 tmp[i].type = LTTNG_EVENT_PROBE;
1892 break;
1893 case LTTNG_UST_FUNCTION:
1894 tmp[i].type = LTTNG_EVENT_FUNCTION;
1895 break;
1896 }
9f19cc17
DG
1897 i++;
1898 }
1899 }
1900
b551a063
DG
1901 ret = nb_event;
1902 *events = tmp;
1903
1904error:
1905 rcu_read_unlock();
1906 return ret;
9f19cc17
DG
1907}
1908
1909/*
b551a063 1910 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 1911 */
b551a063
DG
1912static int list_lttng_kernel_events(char *channel_name,
1913 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 1914{
b551a063
DG
1915 int i = 0, ret;
1916 unsigned int nb_event;
9f19cc17 1917 struct ltt_kernel_event *event;
b551a063
DG
1918 struct ltt_kernel_channel *kchan;
1919
1920 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
1921 if (kchan == NULL) {
1922 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1923 goto error;
1924 }
1925
1926 nb_event = kchan->event_count;
9f19cc17
DG
1927
1928 DBG("Listing events for channel %s", kchan->channel->name);
1929
b551a063
DG
1930 if (nb_event == 0) {
1931 ret = nb_event;
1932 goto error;
1933 }
1934
1935 *events = zmalloc(nb_event * sizeof(struct lttng_event));
1936 if (*events == NULL) {
1937 ret = LTTCOMM_FATAL;
1938 goto error;
1939 }
1940
9f19cc17
DG
1941 /* Kernel channels */
1942 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
1943 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
1944 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1945 (*events)[i].enabled = event->enabled;
9f19cc17
DG
1946 switch (event->event->instrumentation) {
1947 case LTTNG_KERNEL_TRACEPOINT:
b551a063 1948 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
1949 break;
1950 case LTTNG_KERNEL_KPROBE:
1951 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
1952 (*events)[i].type = LTTNG_EVENT_PROBE;
1953 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
1954 sizeof(struct lttng_kernel_kprobe));
1955 break;
1956 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
1957 (*events)[i].type = LTTNG_EVENT_FUNCTION;
1958 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
1959 sizeof(struct lttng_kernel_function));
1960 break;
0133c199 1961 case LTTNG_KERNEL_NOOP:
b551a063 1962 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 1963 break;
a54bd42d 1964 case LTTNG_KERNEL_SYSCALL:
b551a063 1965 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1966 break;
7a3d1328
MD
1967 case LTTNG_KERNEL_ALL:
1968 assert(0);
1969 break;
9f19cc17
DG
1970 }
1971 i++;
1972 }
b551a063
DG
1973
1974 return nb_event;
1975
1976error:
1977 return ret;
9f19cc17
DG
1978}
1979
fac6795d 1980/*
54d01ffb 1981 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1982 */
54d01ffb
DG
1983static int cmd_disable_channel(struct ltt_session *session,
1984 int domain, char *channel_name)
fac6795d 1985{
54d01ffb 1986 int ret;
379473d2 1987
54d01ffb
DG
1988 switch (domain) {
1989 case LTTNG_DOMAIN_KERNEL:
1990 ret = channel_kernel_disable(session->kernel_session,
1991 channel_name);
1992 if (ret != LTTCOMM_OK) {
333f285e
DG
1993 goto error;
1994 }
54d01ffb
DG
1995
1996 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 1997 break;
44d3bd01
DG
1998 case LTTNG_DOMAIN_UST_PID:
1999 break;
d0254c7c 2000 default:
44d3bd01 2001 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 2002 goto error;
20fe2104
DG
2003 }
2004
54d01ffb 2005 ret = LTTCOMM_OK;
d65106b1 2006
54d01ffb
DG
2007error:
2008 return ret;
2009}
2010
56fff090
DG
2011/*
2012 * Copy channel from attributes and set it in the application channel list.
2013 */
f6a9efaa 2014/*
56fff090
DG
2015static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2016 struct lttng_channel *attr, struct ust_app *app)
2017{
2018 int ret;
2019 struct ltt_ust_channel *uchan, *new_chan;
2020
f6a9efaa 2021 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
2022 if (uchan == NULL) {
2023 ret = LTTCOMM_FATAL;
2024 goto error;
2025 }
2026
2027 new_chan = trace_ust_create_channel(attr, usess->path);
2028 if (new_chan == NULL) {
2029 PERROR("malloc ltt_ust_channel");
2030 ret = LTTCOMM_FATAL;
2031 goto error;
2032 }
2033
2034 ret = channel_ust_copy(new_chan, uchan);
2035 if (ret < 0) {
2036 ret = LTTCOMM_FATAL;
2037 goto error;
2038 }
2039
56fff090
DG
2040error:
2041 return ret;
2042}
f6a9efaa 2043*/
56fff090 2044
54d01ffb
DG
2045/*
2046 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2047 */
44d3bd01
DG
2048static int cmd_enable_channel(struct ltt_session *session,
2049 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG
2050{
2051 int ret;
f6a9efaa
DG
2052 struct ltt_ust_session *usess = session->ust_session;
2053
5d56b5aa 2054 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2055
44d3bd01
DG
2056 switch (domain->type) {
2057 case LTTNG_DOMAIN_KERNEL:
2058 {
2059 struct ltt_kernel_channel *kchan;
54d01ffb 2060
44d3bd01
DG
2061 kchan = trace_kernel_get_channel_by_name(attr->name,
2062 session->kernel_session);
2063 if (kchan == NULL) {
2064 ret = channel_kernel_create(session->kernel_session,
2065 attr, kernel_poll_pipe[1]);
2066 } else {
2067 ret = channel_kernel_enable(session->kernel_session, kchan);
2068 }
2069
2070 if (ret != LTTCOMM_OK) {
2071 goto error;
2072 }
2073
2074 kernel_wait_quiescent(kernel_tracer_fd);
2075 break;
2076 }
f6a9efaa
DG
2077 case LTTNG_DOMAIN_UST:
2078 {
2079 struct ltt_ust_channel *uchan;
2080
48842b30 2081 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2082
48842b30 2083 /* Get channel in global UST domain HT */
f6a9efaa
DG
2084 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2085 attr->name);
2086 if (uchan == NULL) {
48842b30 2087 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
2088 if (uchan == NULL) {
2089 ret = LTTCOMM_UST_CHAN_FAIL;
2090 goto error;
2091 }
d5cd1f34 2092
f6a9efaa
DG
2093 rcu_read_lock();
2094 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2095 rcu_read_unlock();
48842b30 2096 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa
DG
2097 } else {
2098 ret = LTTCOMM_UST_CHAN_EXIST;
2099 goto error;
2100 }
2101
421cb601 2102 /* Add channel to all registered applications */
5b4a0ec0 2103 ret = ust_app_create_channel_all(usess, uchan);
509cbaf8 2104 if (ret != 0) {
48842b30
DG
2105 goto error;
2106 }
f6a9efaa 2107
37357452
DG
2108 uchan->enabled = 1;
2109
f6a9efaa
DG
2110 break;
2111 }
44d3bd01
DG
2112 case LTTNG_DOMAIN_UST_PID:
2113 {
f6a9efaa 2114 /*
56fff090
DG
2115 int sock;
2116 struct ltt_ust_channel *uchan;
44d3bd01 2117 struct ltt_ust_session *usess;
56fff090 2118 struct ust_app *app;
44d3bd01
DG
2119
2120 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2121 domain->attr.pid);
2122 if (usess == NULL) {
2123 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2124 goto error;
2125 }
2126
56fff090 2127 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
2128 if (app == NULL) {
2129 ret = LTTCOMM_APP_NOT_FOUND;
2130 goto error;
2131 }
56fff090 2132 sock = app->sock;
44d3bd01
DG
2133
2134 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2135 if (uchan == NULL) {
56fff090 2136 ret = channel_ust_create(usess, attr, sock);
44d3bd01 2137 } else {
56fff090 2138 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG
2139 }
2140
2141 if (ret != LTTCOMM_OK) {
2142 goto error;
2143 }
2144
56fff090
DG
2145 ret = copy_ust_channel_to_app(usess, attr, app);
2146 if (ret != LTTCOMM_OK) {
44d3bd01
DG
2147 goto error;
2148 }
2149
44d3bd01
DG
2150 DBG("UST channel %s created for app sock %d with pid %d",
2151 attr->name, app->sock, domain->attr.pid);
f6a9efaa
DG
2152 */
2153 ret = LTTCOMM_NOT_IMPLEMENTED;
2154 goto error;
44d3bd01
DG
2155 }
2156 default:
2157 ret = LTTCOMM_UNKNOWN_DOMAIN;
2158 goto error;
54d01ffb
DG
2159 }
2160
2161 ret = LTTCOMM_OK;
2162
2163error:
2164 return ret;
2165}
2166
2167/*
2168 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2169 */
2170static int cmd_disable_event(struct ltt_session *session, int domain,
2171 char *channel_name, char *event_name)
2172{
2173 int ret;
54d01ffb
DG
2174
2175 switch (domain) {
2176 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2177 {
2178 struct ltt_kernel_channel *kchan;
2179
54d01ffb
DG
2180 kchan = trace_kernel_get_channel_by_name(channel_name,
2181 session->kernel_session);
2182 if (kchan == NULL) {
2183 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2184 goto error;
d65106b1
DG
2185 }
2186
7a3d1328 2187 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG
2188 if (ret != LTTCOMM_OK) {
2189 goto error;
2190 }
2191
2192 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2193 break;
2bdd86d4
MD
2194 }
2195 case LTTNG_DOMAIN_UST:
2bdd86d4
MD
2196 case LTTNG_DOMAIN_UST_EXEC_NAME:
2197 case LTTNG_DOMAIN_UST_PID:
2198 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2199 default:
2bdd86d4 2200 /* TODO: Other UST domains */
54d01ffb
DG
2201 ret = LTTCOMM_NOT_IMPLEMENTED;
2202 goto error;
d65106b1 2203 }
26cc6b4e 2204
54d01ffb
DG
2205 ret = LTTCOMM_OK;
2206
2207error:
2208 return ret;
2209}
2210
2211/*
2212 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2213 */
2214static int cmd_disable_event_all(struct ltt_session *session, int domain,
2215 char *channel_name)
2216{
2217 int ret;
2218 struct ltt_kernel_channel *kchan;
2219
2220 switch (domain) {
2221 case LTTNG_DOMAIN_KERNEL:
2222 kchan = trace_kernel_get_channel_by_name(channel_name,
2223 session->kernel_session);
2224 if (kchan == NULL) {
2225 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2226 goto error;
26cc6b4e
DG
2227 }
2228
54d01ffb
DG
2229 ret = event_kernel_disable_all(session->kernel_session, kchan);
2230 if (ret != LTTCOMM_OK) {
0b97ec54 2231 goto error;
26cc6b4e
DG
2232 }
2233
54d01ffb 2234 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2235 break;
54d01ffb
DG
2236 default:
2237 /* TODO: Userspace tracing */
2238 ret = LTTCOMM_NOT_IMPLEMENTED;
2239 goto error;
26cc6b4e 2240 }
e953ef25 2241
54d01ffb 2242 ret = LTTCOMM_OK;
e953ef25 2243
54d01ffb
DG
2244error:
2245 return ret;
2246}
f5177a38 2247
54d01ffb
DG
2248/*
2249 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2250 */
2251static int cmd_add_context(struct ltt_session *session, int domain,
2252 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2253{
2254 int ret;
f5177a38 2255
54d01ffb
DG
2256 switch (domain) {
2257 case LTTNG_DOMAIN_KERNEL:
2258 /* Add kernel context to kernel tracer */
2259 ret = context_kernel_add(session->kernel_session, ctx,
2260 event_name, channel_name);
2261 if (ret != LTTCOMM_OK) {
f5177a38 2262 goto error;
e953ef25 2263 }
2bdd86d4
MD
2264 break;
2265 case LTTNG_DOMAIN_UST:
2266 {
48842b30
DG
2267 /*
2268 struct ltt_ust_session *usess;
e953ef25 2269
48842b30
DG
2270 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2271 ret = context_ust_add(usess, ctx,
2272 event_name, channel_name, domain);
2bdd86d4
MD
2273 if (ret != LTTCOMM_OK) {
2274 goto error;
2275 }
2276 }
e953ef25 2277 break;
48842b30 2278 */
2bdd86d4 2279 }
54d01ffb 2280 default:
2bdd86d4 2281 /* TODO: UST other domains */
54d01ffb
DG
2282 ret = LTTCOMM_NOT_IMPLEMENTED;
2283 goto error;
e953ef25 2284 }
950131af 2285
54d01ffb 2286 ret = LTTCOMM_OK;
950131af 2287
54d01ffb
DG
2288error:
2289 return ret;
2290}
2291
2292/*
2293 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2294 */
2295static int cmd_enable_event(struct ltt_session *session, int domain,
2296 char *channel_name, struct lttng_event *event)
2297{
2298 int ret;
f6cd6b0f 2299 struct lttng_channel *attr;
48842b30 2300 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2301
2302 switch (domain) {
2303 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2304 {
2305 struct ltt_kernel_channel *kchan;
2306
54d01ffb
DG
2307 kchan = trace_kernel_get_channel_by_name(channel_name,
2308 session->kernel_session);
2309 if (kchan == NULL) {
f6cd6b0f
DG
2310 attr = channel_new_default_attr(domain);
2311 if (attr == NULL) {
2312 ret = LTTCOMM_FATAL;
2313 goto error;
2314 }
2315 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2316
54d01ffb 2317 /* This call will notify the kernel thread */
44d3bd01 2318 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2319 attr, kernel_poll_pipe[1]);
54d01ffb 2320 if (ret != LTTCOMM_OK) {
f5177a38
DG
2321 goto error;
2322 }
54d01ffb 2323 }
950131af 2324
54d01ffb
DG
2325 /* Get the newly created kernel channel pointer */
2326 kchan = trace_kernel_get_channel_by_name(channel_name,
2327 session->kernel_session);
2328 if (kchan == NULL) {
2329 /* This sould not happen... */
2330 ret = LTTCOMM_FATAL;
2331 goto error;
2332 }
f5177a38 2333
48842b30
DG
2334 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2335 event);
54d01ffb 2336 if (ret != LTTCOMM_OK) {
f5177a38 2337 goto error;
950131af
DG
2338 }
2339
54d01ffb 2340 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2341 break;
2bdd86d4
MD
2342 }
2343 case LTTNG_DOMAIN_UST:
2344 {
48842b30
DG
2345 struct ltt_ust_channel *uchan;
2346 struct ltt_ust_event *uevent;
2bdd86d4 2347
48842b30
DG
2348 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2349 channel_name);
2350 if (uchan == NULL) {
2351 /* TODO: Create default channel */
2352 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2353 goto error;
2354 }
2bdd86d4 2355
48842b30
DG
2356 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2357 if (uevent == NULL) {
2358 uevent = trace_ust_create_event(event);
2359 if (uevent == NULL) {
2bdd86d4
MD
2360 ret = LTTCOMM_FATAL;
2361 goto error;
2362 }
d5cd1f34 2363
48842b30 2364 }
2bdd86d4 2365
5b4a0ec0 2366 ret = ust_app_create_event_all(usess, uchan, uevent);
48842b30
DG
2367 if (ret < 0) {
2368 ret = LTTCOMM_UST_ENABLE_FAIL;
2369 goto error;
2bdd86d4 2370 }
487cf67c 2371
d5cd1f34 2372 /* Add ltt ust event to channel */
487cf67c
DG
2373 rcu_read_lock();
2374 hashtable_add_unique(uchan->events, &uevent->node);
2375 rcu_read_unlock();
d5cd1f34 2376
37357452
DG
2377 uevent->enabled = 1;
2378
d5cd1f34
DG
2379 DBG3("UST ltt event %s added to channel %s", uevent->attr.name,
2380 uchan->name);
2bdd86d4
MD
2381 break;
2382 }
2383 case LTTNG_DOMAIN_UST_EXEC_NAME:
2384 case LTTNG_DOMAIN_UST_PID:
2385 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2386 default:
54d01ffb
DG
2387 ret = LTTCOMM_NOT_IMPLEMENTED;
2388 goto error;
950131af 2389 }
d36b8583 2390
54d01ffb 2391 ret = LTTCOMM_OK;
d36b8583 2392
54d01ffb
DG
2393error:
2394 return ret;
2395}
7d29a247 2396
54d01ffb
DG
2397/*
2398 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2399 */
2400static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2401 char *channel_name, int event_type)
54d01ffb
DG
2402{
2403 int ret;
2404 struct ltt_kernel_channel *kchan;
7d29a247 2405
54d01ffb
DG
2406 switch (domain) {
2407 case LTTNG_DOMAIN_KERNEL:
2408 kchan = trace_kernel_get_channel_by_name(channel_name,
2409 session->kernel_session);
2410 if (kchan == NULL) {
2411 /* This call will notify the kernel thread */
44d3bd01
DG
2412 ret = channel_kernel_create(session->kernel_session, NULL,
2413 kernel_poll_pipe[1]);
54d01ffb
DG
2414 if (ret != LTTCOMM_OK) {
2415 goto error;
d36b8583 2416 }
54d01ffb 2417 }
0d0c377a 2418
54d01ffb
DG
2419 /* Get the newly created kernel channel pointer */
2420 kchan = trace_kernel_get_channel_by_name(channel_name,
2421 session->kernel_session);
2422 if (kchan == NULL) {
2423 /* This sould not happen... */
2424 ret = LTTCOMM_FATAL;
2425 goto error;
2426 }
0fdd1e2c 2427
7a3d1328
MD
2428 switch (event_type) {
2429 case LTTNG_KERNEL_SYSCALL:
2430 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2431 kchan, kernel_tracer_fd);
7a3d1328
MD
2432 break;
2433 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2434 /*
7a3d1328
MD
2435 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2436 * events already registered to the channel.
8c9ae521 2437 */
7a3d1328
MD
2438 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2439 kchan, kernel_tracer_fd);
2440 break;
2441 case LTTNG_KERNEL_ALL:
2442 /* Enable syscalls and tracepoints */
8c9ae521
DG
2443 ret = event_kernel_enable_all(session->kernel_session,
2444 kchan, kernel_tracer_fd);
7a3d1328
MD
2445 break;
2446 default:
2447 ret = LTTCOMM_KERN_ENABLE_FAIL;
2448 goto error;
8c9ae521 2449 }
54d01ffb 2450 if (ret != LTTCOMM_OK) {
0d0c377a 2451 goto error;
d36b8583
DG
2452 }
2453
54d01ffb 2454 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2455 break;
54d01ffb
DG
2456 default:
2457 /* TODO: Userspace tracing */
2458 ret = LTTCOMM_NOT_IMPLEMENTED;
2459 goto error;
d36b8583 2460 }
f3ed775e 2461
54d01ffb
DG
2462 ret = LTTCOMM_OK;
2463
2464error:
2465 return ret;
2466}
2467
2468/*
2469 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2470 */
2471static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2472{
2473 int ret;
2474 ssize_t nb_events = 0;
2475
2476 switch (domain) {
2477 case LTTNG_DOMAIN_KERNEL:
2478 nb_events = kernel_list_events(kernel_tracer_fd, events);
2479 if (nb_events < 0) {
2480 ret = LTTCOMM_KERN_LIST_FAIL;
2481 goto error;
894be886 2482 }
54d01ffb 2483 break;
b551a063
DG
2484 case LTTNG_DOMAIN_UST:
2485 nb_events = ust_app_list_events(events);
2486 if (nb_events < 0) {
2487 ret = LTTCOMM_UST_LIST_FAIL;
2488 goto error;
2489 }
2490 break;
54d01ffb 2491 default:
54d01ffb
DG
2492 ret = LTTCOMM_NOT_IMPLEMENTED;
2493 goto error;
2494 }
894be886 2495
54d01ffb 2496 return nb_events;
7d29a247 2497
54d01ffb
DG
2498error:
2499 /* Return negative value to differentiate return code */
2500 return -ret;
2501}
b389abbe 2502
54d01ffb
DG
2503/*
2504 * Command LTTNG_START_TRACE processed by the client thread.
2505 */
2506static int cmd_start_trace(struct ltt_session *session)
2507{
2508 int ret;
54d01ffb 2509 struct ltt_kernel_session *ksession;
b9d9b220 2510 struct ltt_ust_session *usess;
b389abbe 2511
54d01ffb
DG
2512 /* Short cut */
2513 ksession = session->kernel_session;
b9d9b220 2514 usess = session->ust_session;
5eb91c98 2515
464dd62d
MD
2516 if (session->enabled)
2517 return LTTCOMM_UST_START_FAIL;
2518 session->enabled = 1;
2519
54d01ffb
DG
2520 /* Kernel tracing */
2521 if (ksession != NULL) {
2bdd86d4
MD
2522 struct ltt_kernel_channel *kchan;
2523
54d01ffb
DG
2524 /* Open kernel metadata */
2525 if (ksession->metadata == NULL) {
2526 ret = kernel_open_metadata(ksession, ksession->trace_path);
2527 if (ret < 0) {
2528 ret = LTTCOMM_KERN_META_FAIL;
2529 goto error;
b389abbe 2530 }
54d01ffb 2531 }
7d29a247 2532
54d01ffb
DG
2533 /* Open kernel metadata stream */
2534 if (ksession->metadata_stream_fd == 0) {
2535 ret = kernel_open_metadata_stream(ksession);
2536 if (ret < 0) {
2537 ERR("Kernel create metadata stream failed");
2538 ret = LTTCOMM_KERN_STREAM_FAIL;
2539 goto error;
2540 }
2541 }
2542
2543 /* For each channel */
2544 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2545 if (kchan->stream_count == 0) {
2546 ret = kernel_open_channel_stream(kchan);
2547 if (ret < 0) {
2548 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2549 goto error;
2550 }
54d01ffb
DG
2551 /* Update the stream global counter */
2552 ksession->stream_count_global += ret;
7d29a247 2553 }
54d01ffb
DG
2554 }
2555
2556 /* Setup kernel consumer socket and send fds to it */
2557 ret = init_kernel_tracing(ksession);
2558 if (ret < 0) {
2559 ret = LTTCOMM_KERN_START_FAIL;
2560 goto error;
2561 }
2562
2563 /* This start the kernel tracing */
2564 ret = kernel_start_session(ksession);
2565 if (ret < 0) {
2566 ret = LTTCOMM_KERN_START_FAIL;
2567 goto error;
2568 }
2569
2570 /* Quiescent wait after starting trace */
2571 kernel_wait_quiescent(kernel_tracer_fd);
2572 }
2573
36dc12cc 2574 /* Flag session that trace should start automatically */
b9d9b220
DG
2575 if (usess) {
2576 usess->start_trace = 1;
36dc12cc 2577
b9d9b220
DG
2578 ret = ust_app_start_trace_all(usess);
2579 if (ret < 0) {
2580 ret = LTTCOMM_UST_START_FAIL;
2581 goto error;
2582 }
2bdd86d4 2583 }
54d01ffb
DG
2584
2585 ret = LTTCOMM_OK;
2586
2587error:
2588 return ret;
2589}
2590
2591/*
2592 * Command LTTNG_STOP_TRACE processed by the client thread.
2593 */
2594static int cmd_stop_trace(struct ltt_session *session)
2595{
2596 int ret;
2597 struct ltt_kernel_channel *kchan;
2598 struct ltt_kernel_session *ksession;
48842b30
DG
2599 //struct ltt_ust_session *usess;
2600 //struct ltt_ust_channel *ustchan;
54d01ffb
DG
2601
2602 /* Short cut */
2603 ksession = session->kernel_session;
2604
464dd62d
MD
2605 if (!session->enabled)
2606 return LTTCOMM_UST_START_FAIL;
2607 session->enabled = 0;
2608
54d01ffb
DG
2609 /* Kernel tracer */
2610 if (ksession != NULL) {
2611 DBG("Stop kernel tracing");
2612
2613 /* Flush all buffers before stopping */
2614 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2615 if (ret < 0) {
2616 ERR("Kernel metadata flush failed");
2617 }
f34daff7 2618
54d01ffb
DG
2619 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2620 ret = kernel_flush_buffer(kchan);
0d0c377a 2621 if (ret < 0) {
54d01ffb 2622 ERR("Kernel flush buffer error");
7d29a247 2623 }
54d01ffb 2624 }
19e70852 2625
54d01ffb
DG
2626 ret = kernel_stop_session(ksession);
2627 if (ret < 0) {
2628 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2629 goto error;
f3ed775e 2630 }
54d01ffb
DG
2631
2632 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2633 }
54d01ffb 2634
48842b30 2635#ifdef DISABLE
2bdd86d4
MD
2636 /* Stop each UST session */
2637 DBG("Stop UST tracing");
48842b30 2638 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2bdd86d4 2639 /* Flush all buffers before stopping */
48842b30 2640 ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj);
2bdd86d4
MD
2641 if (ret < 0) {
2642 ERR("UST metadata flush failed");
2643 }
2644
48842b30
DG
2645 cds_list_for_each_entry(ustchan, &usess->channels.head, list) {
2646 ret = ustctl_flush_buffer(usess->sock, ustchan->obj);
2bdd86d4
MD
2647 if (ret < 0) {
2648 ERR("UST flush buffer error");
2649 }
2650 }
2651
48842b30 2652 ret = ustctl_stop_session(usess->sock, usess->handle);
2bdd86d4
MD
2653 if (ret < 0) {
2654 ret = LTTCOMM_KERN_STOP_FAIL;
2655 goto error;
2656 }
2657
48842b30 2658 ustctl_wait_quiescent(usess->sock);
2bdd86d4 2659 }
48842b30 2660#endif
54d01ffb
DG
2661
2662 ret = LTTCOMM_OK;
2663
2664error:
2665 return ret;
2666}
2667
2668/*
2669 * Command LTTNG_CREATE_SESSION processed by the client thread.
2670 */
2671static int cmd_create_session(char *name, char *path)
2672{
2673 int ret;
2674
2675 ret = session_create(name, path);
2676 if (ret != LTTCOMM_OK) {
2677 goto error;
2678 }
2679
2680 ret = LTTCOMM_OK;
2681
2682error:
2683 return ret;
2684}
2685
2686/*
2687 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2688 */
2689static int cmd_destroy_session(struct ltt_session *session, char *name)
2690{
2691 int ret;
2692
2693 /* Clean kernel session teardown */
2694 teardown_kernel_session(session);
2695
2696 /*
2697 * Must notify the kernel thread here to update it's poll setin order
2698 * to remove the channel(s)' fd just destroyed.
2699 */
2700 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2701 if (ret < 0) {
2702 perror("write kernel poll pipe");
2703 }
2704
271933a4 2705 ret = session_destroy(session);
54d01ffb
DG
2706
2707 return ret;
2708}
2709
2710/*
2711 * Command LTTNG_CALIBRATE processed by the client thread.
2712 */
2713static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2714{
2715 int ret;
2716
2717 switch (domain) {
2718 case LTTNG_DOMAIN_KERNEL:
33a2b854 2719 {
54d01ffb 2720 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2721
54d01ffb
DG
2722 kcalibrate.type = calibrate->type;
2723 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2724 if (ret < 0) {
54d01ffb
DG
2725 ret = LTTCOMM_KERN_ENABLE_FAIL;
2726 goto error;
33a2b854 2727 }
54d01ffb
DG
2728 break;
2729 }
2730 default:
2731 /* TODO: Userspace tracing */
2732 ret = LTTCOMM_NOT_IMPLEMENTED;
2733 goto error;
2734 }
33a2b854 2735
54d01ffb 2736 ret = LTTCOMM_OK;
33a2b854 2737
54d01ffb
DG
2738error:
2739 return ret;
2740}
7d29a247 2741
54d01ffb
DG
2742/*
2743 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2744 */
2745static int cmd_register_consumer(struct ltt_session *session, int domain,
2746 char *sock_path)
2747{
2748 int ret, sock;
b389abbe 2749
54d01ffb
DG
2750 switch (domain) {
2751 case LTTNG_DOMAIN_KERNEL:
2752 /* Can't register a consumer if there is already one */
2753 if (session->kernel_session->consumer_fd != 0) {
2754 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2755 goto error;
2756 }
2757
2758 sock = lttcomm_connect_unix_sock(sock_path);
2759 if (sock < 0) {
2760 ret = LTTCOMM_CONNECT_FAIL;
2761 goto error;
2762 }
2763
2764 session->kernel_session->consumer_fd = sock;
2765 break;
2766 default:
2767 /* TODO: Userspace tracing */
2768 ret = LTTCOMM_NOT_IMPLEMENTED;
2769 goto error;
2770 }
2771
2772 ret = LTTCOMM_OK;
2773
2774error:
2775 return ret;
2776}
2777
2778/*
2779 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2780 */
2781static ssize_t cmd_list_domains(struct ltt_session *session,
2782 struct lttng_domain **domains)
2783{
b551a063 2784 int ret, index = 0;
54d01ffb
DG
2785 ssize_t nb_dom = 0;
2786
2787 if (session->kernel_session != NULL) {
b551a063 2788 DBG3("Listing domains found kernel domain");
54d01ffb
DG
2789 nb_dom++;
2790 }
2791
b551a063
DG
2792 if (session->ust_session != NULL) {
2793 DBG3("Listing domains found UST global domain");
2794 nb_dom++;
2795 }
54d01ffb 2796
b551a063 2797 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
2798 if (*domains == NULL) {
2799 ret = -LTTCOMM_FATAL;
2800 goto error;
2801 }
2802
b551a063
DG
2803 if (session->kernel_session != NULL) {
2804 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2805 index++;
2806 }
2807
2808 if (session->ust_session != NULL) {
2809 (*domains)[index].type = LTTNG_DOMAIN_UST;
2810 index++;
2811 }
54d01ffb 2812
54d01ffb
DG
2813 return nb_dom;
2814
2815error:
2816 return ret;
2817}
2818
2819/*
2820 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2821 */
b551a063 2822static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
2823 struct lttng_channel **channels)
2824{
2825 int ret;
2826 ssize_t nb_chan = 0;
2827
b551a063
DG
2828 switch (domain) {
2829 case LTTNG_DOMAIN_KERNEL:
2830 if (session->kernel_session != NULL) {
2831 nb_chan = session->kernel_session->channel_count;
2832 }
2833 DBG3("Number of kernel channels %ld", nb_chan);
2834 break;
2835 case LTTNG_DOMAIN_UST:
2836 if (session->ust_session != NULL) {
2837 nb_chan = hashtable_get_count(
2838 session->ust_session->domain_global.channels);
2839 }
2840 DBG3("Number of UST global channels %ld", nb_chan);
2841 break;
2842 default:
2843 *channels = NULL;
2844 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
2845 goto error;
2846 }
2847
b551a063
DG
2848 if (nb_chan > 0) {
2849 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2850 if (*channels == NULL) {
2851 ret = -LTTCOMM_FATAL;
2852 goto error;
2853 }
54d01ffb 2854
b551a063
DG
2855 list_lttng_channels(domain, session, *channels);
2856 } else {
2857 *channels = NULL;
2858 }
2bdd86d4 2859
54d01ffb
DG
2860 return nb_chan;
2861
2862error:
2863 return ret;
2864}
2865
2866/*
2867 * Command LTTNG_LIST_EVENTS processed by the client thread.
2868 */
b551a063 2869static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
2870 char *channel_name, struct lttng_event **events)
2871{
b551a063 2872 int ret = 0;
54d01ffb 2873 ssize_t nb_event = 0;
54d01ffb 2874
b551a063
DG
2875 switch (domain) {
2876 case LTTNG_DOMAIN_KERNEL:
2877 if (session->kernel_session != NULL) {
2878 nb_event = list_lttng_kernel_events(channel_name,
2879 session->kernel_session, events);
54d01ffb 2880 }
b551a063
DG
2881 break;
2882 case LTTNG_DOMAIN_UST:
2883 {
2884 if (session->ust_session != NULL) {
2885 nb_event = list_lttng_ust_global_events(channel_name,
2886 &session->ust_session->domain_global, events);
2887 }
2888 break;
54d01ffb 2889 }
b551a063
DG
2890 default:
2891 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
2892 goto error;
2893 }
2894
b551a063 2895 ret = nb_event;
54d01ffb
DG
2896
2897error:
2898 return ret;
2899}
2900
2901/*
2902 * Process the command requested by the lttng client within the command
2903 * context structure. This function make sure that the return structure (llm)
2904 * is set and ready for transmission before returning.
2905 *
2906 * Return any error encountered or 0 for success.
2907 */
2908static int process_client_msg(struct command_ctx *cmd_ctx)
2909{
2910 int ret = LTTCOMM_OK;
44d3bd01 2911 int need_tracing_session = 1;
54d01ffb
DG
2912
2913 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2914
2915 /*
2916 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2917 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2918 * command.
2919 */
2920 switch(cmd_ctx->lsm->cmd_type) {
2921 case LTTNG_LIST_SESSIONS:
2922 case LTTNG_LIST_TRACEPOINTS:
2923 case LTTNG_LIST_DOMAINS:
2924 case LTTNG_LIST_CHANNELS:
2925 case LTTNG_LIST_EVENTS:
2926 break;
2927 default:
2928 /* Setup lttng message with no payload */
2929 ret = setup_lttng_msg(cmd_ctx, 0);
2930 if (ret < 0) {
2931 /* This label does not try to unlock the session */
2932 goto init_setup_error;
2933 }
2934 }
2935
2936 /* Commands that DO NOT need a session. */
2937 switch (cmd_ctx->lsm->cmd_type) {
2938 case LTTNG_CALIBRATE:
2939 case LTTNG_CREATE_SESSION:
2940 case LTTNG_LIST_SESSIONS:
2941 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2942 need_tracing_session = 0;
54d01ffb
DG
2943 break;
2944 default:
2945 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 2946 session_lock_list();
54d01ffb 2947 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 2948 session_unlock_list();
54d01ffb
DG
2949 if (cmd_ctx->session == NULL) {
2950 if (cmd_ctx->lsm->session.name != NULL) {
2951 ret = LTTCOMM_SESS_NOT_FOUND;
2952 } else {
2953 /* If no session name specified */
2954 ret = LTTCOMM_SELECT_SESS;
2955 }
2956 goto error;
2957 } else {
2958 /* Acquire lock for the session */
2959 session_lock(cmd_ctx->session);
2960 }
2961 break;
2962 }
b389abbe 2963
54d01ffb
DG
2964 /*
2965 * Check domain type for specific "pre-action".
2966 */
2967 switch (cmd_ctx->lsm->domain.type) {
2968 case LTTNG_DOMAIN_KERNEL:
2969 /* Kernel tracer check */
2970 if (kernel_tracer_fd == 0) {
2971 /* Basically, load kernel tracer modules */
2972 init_kernel_tracer();
2973 if (kernel_tracer_fd == 0) {
2974 ret = LTTCOMM_KERN_NA;
2975 goto error;
2976 }
2977 }
5eb91c98 2978
54d01ffb 2979 /* Need a session for kernel command */
44d3bd01 2980 if (need_tracing_session) {
54d01ffb
DG
2981 if (cmd_ctx->session->kernel_session == NULL) {
2982 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2983 if (ret < 0) {
54d01ffb 2984 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2985 goto error;
2986 }
b389abbe 2987 }
7d29a247 2988
54d01ffb 2989 /* Start the kernel consumer daemon */
3bd1e081
MD
2990 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2991 if (kconsumer_data.pid == 0 &&
54d01ffb 2992 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
2993 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2994 ret = start_consumerd(&kconsumer_data);
7d29a247 2995 if (ret < 0) {
54d01ffb
DG
2996 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2997 goto error;
950131af 2998 }
33a2b854 2999 }
3bd1e081 3000 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
0d0c377a 3001 }
54d01ffb 3002 break;
2bdd86d4 3003 case LTTNG_DOMAIN_UST:
44d3bd01 3004 {
44d3bd01 3005 if (need_tracing_session) {
f6a9efaa 3006 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
3007 ret = create_ust_session(cmd_ctx->session,
3008 &cmd_ctx->lsm->domain);
3009 if (ret != LTTCOMM_OK) {
3010 goto error;
3011 }
3012 }
2bdd86d4
MD
3013 /* Start the kernel consumer daemon */
3014 pthread_mutex_lock(&ustconsumer_data.pid_mutex);
3015 if (ustconsumer_data.pid == 0 &&
3016 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3017 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
3018 ret = start_consumerd(&ustconsumer_data);
3019 if (ret < 0) {
3020 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3021 goto error;
3022 }
48842b30 3023
ba5d816e 3024 ust_consumer_fd = ustconsumer_data.cmd_sock;
2bdd86d4
MD
3025 }
3026 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
44d3bd01
DG
3027 }
3028 break;
48842b30 3029 }
54d01ffb 3030 default:
54d01ffb
DG
3031 break;
3032 }
33a2b854 3033
54d01ffb
DG
3034 /* Process by command type */
3035 switch (cmd_ctx->lsm->cmd_type) {
3036 case LTTNG_ADD_CONTEXT:
3037 {
3038 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3039 cmd_ctx->lsm->u.context.channel_name,
3040 cmd_ctx->lsm->u.context.event_name,
3041 &cmd_ctx->lsm->u.context.ctx);
3042 break;
3043 }
3044 case LTTNG_DISABLE_CHANNEL:
3045 {
3046 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3047 cmd_ctx->lsm->u.disable.channel_name);
3048 break;
3049 }
3050 case LTTNG_DISABLE_EVENT:
3051 {
3052 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3053 cmd_ctx->lsm->u.disable.channel_name,
3054 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
3055 ret = LTTCOMM_OK;
3056 break;
3057 }
54d01ffb
DG
3058 case LTTNG_DISABLE_ALL_EVENT:
3059 {
2bdd86d4 3060 DBG("Disabling all events");
54d01ffb
DG
3061
3062 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3063 cmd_ctx->lsm->u.disable.channel_name);
3064 break;
3065 }
3066 case LTTNG_ENABLE_CHANNEL:
3067 {
44d3bd01 3068 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG
3069 &cmd_ctx->lsm->u.channel.chan);
3070 break;
3071 }
3072 case LTTNG_ENABLE_EVENT:
3073 {
3074 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3075 cmd_ctx->lsm->u.enable.channel_name,
3076 &cmd_ctx->lsm->u.enable.event);
3077 break;
3078 }
3079 case LTTNG_ENABLE_ALL_EVENT:
3080 {
2bdd86d4 3081 DBG("Enabling all events");
54d01ffb
DG
3082
3083 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
3084 cmd_ctx->lsm->u.enable.channel_name,
3085 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
3086 break;
3087 }
052da939 3088 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3089 {
9f19cc17 3090 struct lttng_event *events;
54d01ffb 3091 ssize_t nb_events;
052da939 3092
54d01ffb
DG
3093 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3094 if (nb_events < 0) {
3095 ret = -nb_events;
3096 goto error;
2ef84c95
DG
3097 }
3098
3099 /*
3100 * Setup lttng message with payload size set to the event list size in
3101 * bytes and then copy list into the llm payload.
3102 */
052da939 3103 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3104 if (ret < 0) {
052da939 3105 free(events);
2ef84c95
DG
3106 goto setup_error;
3107 }
3108
3109 /* Copy event list into message payload */
9f19cc17 3110 memcpy(cmd_ctx->llm->payload, events,
052da939 3111 sizeof(struct lttng_event) * nb_events);
2ef84c95 3112
9f19cc17 3113 free(events);
2ef84c95
DG
3114
3115 ret = LTTCOMM_OK;
3116 break;
3117 }
f3ed775e 3118 case LTTNG_START_TRACE:
8c0faa1d 3119 {
54d01ffb 3120 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
3121 break;
3122 }
f3ed775e 3123 case LTTNG_STOP_TRACE:
8c0faa1d 3124 {
54d01ffb 3125 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
3126 break;
3127 }
5e16da05
MD
3128 case LTTNG_CREATE_SESSION:
3129 {
54d01ffb
DG
3130 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3131 cmd_ctx->lsm->session.path);
5e16da05
MD
3132 break;
3133 }
3134 case LTTNG_DESTROY_SESSION:
3135 {
54d01ffb
DG
3136 ret = cmd_destroy_session(cmd_ctx->session,
3137 cmd_ctx->lsm->session.name);
5461b305 3138 break;
5e16da05 3139 }
9f19cc17 3140 case LTTNG_LIST_DOMAINS:
5e16da05 3141 {
54d01ffb
DG
3142 ssize_t nb_dom;
3143 struct lttng_domain *domains;
5461b305 3144
54d01ffb
DG
3145 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3146 if (nb_dom < 0) {
3147 ret = -nb_dom;
3148 goto error;
ce3d728c 3149 }
520ff687 3150
54d01ffb 3151 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
3152 if (ret < 0) {
3153 goto setup_error;
520ff687 3154 }
57167058 3155
54d01ffb
DG
3156 /* Copy event list into message payload */
3157 memcpy(cmd_ctx->llm->payload, domains,
3158 nb_dom * sizeof(struct lttng_domain));
3159
3160 free(domains);
5e16da05 3161
5461b305 3162 ret = LTTCOMM_OK;
5e16da05
MD
3163 break;
3164 }
9f19cc17 3165 case LTTNG_LIST_CHANNELS:
5e16da05 3166 {
54d01ffb
DG
3167 size_t nb_chan;
3168 struct lttng_channel *channels;
3169
b551a063
DG
3170 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3171 cmd_ctx->session, &channels);
54d01ffb
DG
3172 if (nb_chan < 0) {
3173 ret = -nb_chan;
3174 goto error;
5461b305 3175 }
ca95a216 3176
54d01ffb 3177 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
3178 if (ret < 0) {
3179 goto setup_error;
3180 }
9f19cc17 3181
54d01ffb
DG
3182 /* Copy event list into message payload */
3183 memcpy(cmd_ctx->llm->payload, channels,
3184 nb_chan * sizeof(struct lttng_channel));
3185
3186 free(channels);
9f19cc17
DG
3187
3188 ret = LTTCOMM_OK;
5461b305 3189 break;
5e16da05 3190 }
9f19cc17 3191 case LTTNG_LIST_EVENTS:
5e16da05 3192 {
b551a063 3193 ssize_t nb_event;
684d34d2 3194 struct lttng_event *events = NULL;
9f19cc17 3195
b551a063 3196 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
3197 cmd_ctx->lsm->u.list.channel_name, &events);
3198 if (nb_event < 0) {
3199 ret = -nb_event;
3200 goto error;
5461b305 3201 }
ca95a216 3202
54d01ffb 3203 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
3204 if (ret < 0) {
3205 goto setup_error;
3206 }
9f19cc17 3207
54d01ffb
DG
3208 /* Copy event list into message payload */
3209 memcpy(cmd_ctx->llm->payload, events,
3210 nb_event * sizeof(struct lttng_event));
9f19cc17 3211
54d01ffb 3212 free(events);
9f19cc17
DG
3213
3214 ret = LTTCOMM_OK;
5461b305 3215 break;
5e16da05
MD
3216 }
3217 case LTTNG_LIST_SESSIONS:
3218 {
54d01ffb 3219 session_lock_list();
5461b305 3220
6c9cc2ab 3221 if (session_list_ptr->count == 0) {
f3ed775e 3222 ret = LTTCOMM_NO_SESSION;
54d01ffb 3223 session_unlock_list();
5461b305 3224 goto error;
57167058 3225 }
5e16da05 3226
6c9cc2ab
DG
3227 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3228 session_list_ptr->count);
5461b305 3229 if (ret < 0) {
54d01ffb 3230 session_unlock_list();
5461b305 3231 goto setup_error;
e065084a 3232 }
5e16da05 3233
6c9cc2ab
DG
3234 /* Filled the session array */
3235 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3236
54d01ffb 3237 session_unlock_list();
5e16da05 3238
5461b305 3239 ret = LTTCOMM_OK;
5e16da05
MD
3240 break;
3241 }
d0254c7c
MD
3242 case LTTNG_CALIBRATE:
3243 {
54d01ffb
DG
3244 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3245 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
3246 break;
3247 }
d9800920
DG
3248 case LTTNG_REGISTER_CONSUMER:
3249 {
54d01ffb
DG
3250 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3251 cmd_ctx->lsm->u.reg.path);
d9800920
DG
3252 break;
3253 }
5e16da05 3254 default:
5e16da05 3255 ret = LTTCOMM_UND;
5461b305 3256 break;
fac6795d
DG
3257 }
3258
5461b305 3259error:
5461b305
DG
3260 if (cmd_ctx->llm == NULL) {
3261 DBG("Missing llm structure. Allocating one.");
894be886 3262 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
3263 goto setup_error;
3264 }
3265 }
54d01ffb 3266 /* Set return code */
5461b305 3267 cmd_ctx->llm->ret_code = ret;
5461b305 3268setup_error:
b5541356 3269 if (cmd_ctx->session) {
54d01ffb 3270 session_unlock(cmd_ctx->session);
b5541356 3271 }
54d01ffb 3272init_setup_error:
8028d920 3273 return ret;
fac6795d
DG
3274}
3275
1d4b027a 3276/*
d063d709
DG
3277 * This thread manage all clients request using the unix client socket for
3278 * communication.
1d4b027a
DG
3279 */
3280static void *thread_manage_clients(void *data)
3281{
5eb91c98
DG
3282 int sock = 0, ret, i, pollfd;
3283 uint32_t revents, nb_fd;
273ea72c 3284 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3285 struct lttng_poll_event events;
1d4b027a
DG
3286
3287 DBG("[thread] Manage client started");
3288
f6a9efaa
DG
3289 rcu_register_thread();
3290
1d4b027a
DG
3291 ret = lttcomm_listen_unix_sock(client_sock);
3292 if (ret < 0) {
3293 goto error;
3294 }
3295
5eb91c98
DG
3296 /*
3297 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3298 * more will be added to this poll set.
3299 */
3300 ret = create_thread_poll_set(&events, 2);
3301 if (ret < 0) {
3302 goto error;
3303 }
273ea72c 3304
5eb91c98
DG
3305 /* Add the application registration socket */
3306 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3307 if (ret < 0) {
3308 goto error;
3309 }
273ea72c 3310
bbd973c2
DG
3311 /*
3312 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
3313 */
3314 if (opt_sig_parent) {
3315 kill(ppid, SIGCHLD);
3316 }
3317
3318 while (1) {
1d4b027a 3319 DBG("Accepting client command ...");
273ea72c 3320
5eb91c98
DG
3321 nb_fd = LTTNG_POLL_GETNB(&events);
3322
273ea72c 3323 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3324 ret = lttng_poll_wait(&events, -1);
273ea72c 3325 if (ret < 0) {
273ea72c
DG
3326 goto error;
3327 }
3328
5eb91c98
DG
3329 for (i = 0; i < nb_fd; i++) {
3330 /* Fetch once the poll data */
3331 revents = LTTNG_POLL_GETEV(&events, i);
3332 pollfd = LTTNG_POLL_GETFD(&events, i);