Add missing function references with no UST support
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
20fe2104 53#include "kernel-ctl.h"
32258573 54#include "lttng-sessiond.h"
0fdd1e2c 55#include "shm.h"
56fff090 56#include "ust-app.h"
1e307fab 57#include "ust-ctl.h"
8e68d1c8 58#include "utils.h"
fac6795d 59
3bd1e081
MD
60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 80const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG
89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d
DG
92static int opt_daemon;
93static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 94static pid_t ppid; /* Parent PID for --sig-parent option */
3bd1e081
MD
95
96/* Consumer daemon specific control data */
97static struct consumer_data kconsumer_data = {
98 .type = LTTNG_CONSUMER_KERNEL,
99};
100static struct consumer_data ustconsumer_data = {
101 .type = LTTNG_CONSUMER_UST,
102};
103
099e26bd 104static int dispatch_thread_exit;
fac6795d 105
54d01ffb
DG
106/* Global application Unix socket path */
107static char apps_unix_sock_path[PATH_MAX];
108/* Global client Unix socket path */
109static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
110/* global wait shm path for UST */
111static char wait_shm_path[PATH_MAX];
fac6795d 112
1d4b027a 113/* Sockets and FDs */
d6f42150
DG
114static int client_sock;
115static int apps_sock;
20fe2104 116static int kernel_tracer_fd;
7a485870 117static int kernel_poll_pipe[2];
1d4b027a 118
273ea72c
DG
119/*
120 * Quit pipe for all threads. This permits a single cancellation point
121 * for all threads when receiving an event on the pipe.
122 */
123static int thread_quit_pipe[2];
124
099e26bd
DG
125/*
126 * This pipe is used to inform the thread managing application communication
127 * that a command is queued and ready to be processed.
128 */
129static int apps_cmd_pipe[2];
130
1d4b027a 131/* Pthread, Mutexes and Semaphores */
1d4b027a 132static pthread_t apps_thread;
099e26bd 133static pthread_t reg_apps_thread;
1d4b027a 134static pthread_t client_thread;
7a485870 135static pthread_t kernel_thread;
099e26bd 136static pthread_t dispatch_thread;
5eb91c98 137
fac6795d 138
099e26bd
DG
139/*
140 * UST registration command queue. This queue is tied with a futex and uses a N
141 * wakers / 1 waiter implemented and detailed in futex.c/.h
142 *
143 * The thread_manage_apps and thread_dispatch_ust_registration interact with
144 * this queue and the wait/wake scheme.
145 */
146static struct ust_cmd_queue ust_cmd_queue;
147
b5541356
DG
148/*
149 * Pointer initialized before thread creation.
150 *
151 * This points to the tracing session list containing the session count and a
152 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
153 * MUST NOT be taken if you call a public function in session.c.
04ea676f 154 *
d063d709 155 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 156 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
157 */
158static struct ltt_session_list *session_list_ptr;
159
5eb91c98
DG
160/*
161 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
162 */
163static int create_thread_poll_set(struct lttng_poll_event *events,
164 unsigned int size)
165{
166 int ret;
167
168 if (events == NULL || size == 0) {
169 ret = -1;
170 goto error;
171 }
172
173 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
174 if (ret < 0) {
175 goto error;
176 }
177
178 /* Add quit pipe */
179 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
180 if (ret < 0) {
181 goto error;
182 }
183
184 return 0;
185
186error:
187 return ret;
188}
189
190/*
191 * Check if the thread quit pipe was triggered.
192 *
193 * Return 1 if it was triggered else 0;
194 */
195static int check_thread_quit_pipe(int fd, uint32_t events)
196{
197 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
198 return 1;
199 }
200
201 return 0;
202}
203
0fdd1e2c
DG
204/*
205 * Remove modules in reverse load order.
206 */
207static int modprobe_remove_kernel_modules(void)
208{
209 int ret = 0, i;
210 char modprobe[256];
211
212 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
213 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 214 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
215 kernel_modules_list[i].name);
216 if (ret < 0) {
24b487b8 217 perror("snprintf modprobe -r");
0fdd1e2c
DG
218 goto error;
219 }
220 modprobe[sizeof(modprobe) - 1] = '\0';
221 ret = system(modprobe);
222 if (ret == -1) {
24b487b8 223 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
224 kernel_modules_list[i].name);
225 } else if (kernel_modules_list[i].required
226 && WEXITSTATUS(ret) != 0) {
227 ERR("Unable to remove module %s",
228 kernel_modules_list[i].name);
229 } else {
230 DBG("Modprobe removal successful %s",
231 kernel_modules_list[i].name);
232 }
233 }
234
235error:
236 return ret;
237}
238
239/*
240 * Return group ID of the tracing group or -1 if not found.
241 */
996b65c8
MD
242static gid_t allowed_group(void)
243{
244 struct group *grp;
245
274e143b
MD
246 if (opt_tracing_group) {
247 grp = getgrnam(opt_tracing_group);
248 } else {
249 grp = getgrnam(default_tracing_group);
250 }
996b65c8
MD
251 if (!grp) {
252 return -1;
253 } else {
254 return grp->gr_gid;
255 }
256}
257
273ea72c 258/*
5eb91c98 259 * Init thread quit pipe.
273ea72c
DG
260 *
261 * Return -1 on error or 0 if all pipes are created.
262 */
263static int init_thread_quit_pipe(void)
264{
265 int ret;
266
267 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
268 if (ret < 0) {
269 perror("thread quit pipe");
270 goto error;
271 }
272
273error:
274 return ret;
275}
276
fac6795d 277/*
d063d709
DG
278 * Complete teardown of a kernel session. This free all data structure related
279 * to a kernel session and update counter.
fac6795d 280 */
1d4b027a 281static void teardown_kernel_session(struct ltt_session *session)
fac6795d 282{
1d4b027a
DG
283 if (session->kernel_session != NULL) {
284 DBG("Tearing down kernel session");
d9800920
DG
285
286 /*
287 * If a custom kernel consumer was registered, close the socket before
288 * tearing down the complete kernel session structure
289 */
3bd1e081 290 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
d9800920
DG
291 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
292 }
293
62499ad6 294 trace_kernel_destroy_session(session->kernel_session);
1d4b027a
DG
295 /* Extra precaution */
296 session->kernel_session = NULL;
fac6795d 297 }
fac6795d
DG
298}
299
f6a9efaa
DG
300/*
301 * Complete teardown of all UST sessions. This will free everything on his path
302 * and destroy the core essence of all ust sessions :)
303 */
304static void teardown_ust_session(struct ltt_session *session)
305{
306 DBG("Tearing down UST session(s)");
307
308 trace_ust_destroy_session(session->ust_session);
309}
310
099e26bd
DG
311/*
312 * Stop all threads by closing the thread quit pipe.
313 */
cf3af59e
MD
314static void stop_threads(void)
315{
5eb91c98
DG
316 int ret;
317
cf3af59e
MD
318 /* Stopping all threads */
319 DBG("Terminating all threads");
54d01ffb 320 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
321 if (ret < 0) {
322 ERR("write error on thread quit pipe");
323 }
324
099e26bd
DG
325 /* Dispatch thread */
326 dispatch_thread_exit = 1;
327 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
328}
329
fac6795d 330/*
d063d709 331 * Cleanup the daemon
fac6795d 332 */
cf3af59e 333static void cleanup(void)
fac6795d 334{
1d4b027a
DG
335 int ret;
336 char *cmd;
af9737e9 337 struct ltt_session *sess, *stmp;
fac6795d 338
1d4b027a 339 DBG("Cleaning up");
e07ae692 340
1d4b027a 341 /* <fun> */
2f50c8a3 342 MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
273ea72c
DG
343 "Matthew, BEET driven development works!%c[%dm",
344 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
1d4b027a 345 /* </fun> */
fac6795d 346
5eb91c98
DG
347 if (is_root) {
348 DBG("Removing %s directory", LTTNG_RUNDIR);
349 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
350 if (ret < 0) {
351 ERR("asprintf failed. Something is really wrong!");
352 }
5461b305 353
5eb91c98
DG
354 /* Remove lttng run directory */
355 ret = system(cmd);
356 if (ret < 0) {
357 ERR("Unable to clean " LTTNG_RUNDIR);
358 }
1d4b027a 359 }
5461b305 360
1d4b027a 361 DBG("Cleaning up all session");
fac6795d 362
b5541356 363 /* Destroy session list mutex */
273ea72c
DG
364 if (session_list_ptr != NULL) {
365 pthread_mutex_destroy(&session_list_ptr->lock);
366
367 /* Cleanup ALL session */
54d01ffb
DG
368 cds_list_for_each_entry_safe(sess, stmp,
369 &session_list_ptr->head, list) {
273ea72c 370 teardown_kernel_session(sess);
f6a9efaa
DG
371 teardown_ust_session(sess);
372 free(sess);
273ea72c
DG
373 }
374 }
375
099e26bd 376 DBG("Closing all UST sockets");
56fff090 377 ust_app_clean_list();
099e26bd 378
3bd1e081 379 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 380
f3ed775e 381 DBG("Closing kernel fd");
1d4b027a 382 close(kernel_tracer_fd);
ab147185 383
2f50c8a3
DG
384 if (is_root) {
385 DBG("Unloading kernel modules");
386 modprobe_remove_kernel_modules();
387 }
5eb91c98
DG
388
389 close(thread_quit_pipe[0]);
390 close(thread_quit_pipe[1]);
fac6795d
DG
391}
392
e065084a 393/*
d063d709 394 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 395 *
d063d709 396 * Return lttcomm error code.
e065084a
DG
397 */
398static int send_unix_sock(int sock, void *buf, size_t len)
399{
400 /* Check valid length */
401 if (len <= 0) {
402 return -1;
403 }
404
405 return lttcomm_send_unix_sock(sock, buf, len);
406}
407
5461b305 408/*
d063d709 409 * Free memory of a command context structure.
5461b305 410 */
a2fb29a5 411static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 412{
a2fb29a5
DG
413 DBG("Clean command context structure");
414 if (*cmd_ctx) {
415 if ((*cmd_ctx)->llm) {
416 free((*cmd_ctx)->llm);
5461b305 417 }
a2fb29a5
DG
418 if ((*cmd_ctx)->lsm) {
419 free((*cmd_ctx)->lsm);
5461b305 420 }
a2fb29a5
DG
421 free(*cmd_ctx);
422 *cmd_ctx = NULL;
5461b305
DG
423 }
424}
425
f3ed775e 426/*
d063d709 427 * Send all stream fds of kernel channel to the consumer.
f3ed775e 428 */
2bdd86d4 429static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 430 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
431{
432 int ret;
f3ed775e 433 struct ltt_kernel_stream *stream;
3bd1e081 434 struct lttcomm_consumer_msg lkm;
f3ed775e 435
3bd1e081 436 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 437 channel->channel->name);
f3ed775e 438
3bd1e081
MD
439 /* Send channel */
440 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
441 lkm.u.channel.channel_key = channel->fd;
442 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
443 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 444 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 445 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 446 if (ret < 0) {
3bd1e081 447 perror("send consumer channel");
f3ed775e
DG
448 goto error;
449 }
450
3bd1e081 451 /* Send streams */
7a485870 452 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
453 if (!stream->fd) {
454 continue;
455 }
456 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
457 lkm.u.stream.channel_key = channel->fd;
458 lkm.u.stream.stream_key = stream->fd;
459 lkm.u.stream.state = stream->state;
460 lkm.u.stream.output = channel->channel->attr.output;
461 lkm.u.stream.mmap_len = 0; /* for kernel */
462 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
463 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
464 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
465 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
466 if (ret < 0) {
467 perror("send consumer stream");
468 goto error;
469 }
470 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
471 if (ret < 0) {
472 perror("send consumer stream ancillary data");
473 goto error;
f3ed775e
DG
474 }
475 }
476
3bd1e081 477 DBG("consumer channel streams sent");
f3ed775e
DG
478
479 return 0;
480
481error:
482 return ret;
483}
484
485/*
d063d709 486 * Send all stream fds of the kernel session to the consumer.
f3ed775e 487 */
2bdd86d4 488static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 489 struct ltt_kernel_session *session)
f3ed775e
DG
490{
491 int ret;
492 struct ltt_kernel_channel *chan;
3bd1e081
MD
493 struct lttcomm_consumer_msg lkm;
494 int sock = session->consumer_fd;
7a485870
DG
495
496 DBG("Sending metadata stream fd");
497
2bdd86d4 498 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 499 if (session->consumer_fd == 0) {
3bd1e081 500 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
501 }
502
7a485870 503 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
504 /* Send metadata channel fd */
505 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
506 lkm.u.channel.channel_key = session->metadata->fd;
507 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
508 lkm.u.channel.mmap_len = 0; /* for kernel */
509 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
510 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
511 if (ret < 0) {
512 perror("send consumer channel");
513 goto error;
514 }
515
516 /* Send metadata stream fd */
517 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
518 lkm.u.stream.channel_key = session->metadata->fd;
519 lkm.u.stream.stream_key = session->metadata_stream_fd;
520 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
521 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
522 lkm.u.stream.mmap_len = 0; /* for kernel */
523 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
524 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
525 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
526 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
527 if (ret < 0) {
528 perror("send consumer stream");
529 goto error;
530 }
531 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 532 if (ret < 0) {
3bd1e081 533 perror("send consumer stream");
7a485870
DG
534 goto error;
535 }
536 }
f3ed775e 537
f3ed775e 538 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD
539 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
540 if (ret < 0) {
541 goto error;
542 }
543 }
544
545 DBG("consumer fds (metadata and channel streams) sent");
546
547 return 0;
548
549error:
550 return ret;
551}
552
fac6795d 553/*
0fdd1e2c 554 * Notify UST applications using the shm mmap futex.
fac6795d 555 */
0fdd1e2c 556static int notify_ust_apps(int active)
fac6795d 557{
0fdd1e2c 558 char *wait_shm_mmap;
fac6795d 559
0fdd1e2c 560 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 561
0fdd1e2c
DG
562 /* See shm.c for this call implying mmap, shm and futex calls */
563 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
564 if (wait_shm_mmap == NULL) {
fac6795d
DG
565 goto error;
566 }
567
0fdd1e2c
DG
568 /* Wake waiting process */
569 futex_wait_update((int32_t *) wait_shm_mmap, active);
570
571 /* Apps notified successfully */
572 return 0;
fac6795d
DG
573
574error:
0fdd1e2c 575 return -1;
fac6795d
DG
576}
577
e065084a 578/*
d063d709
DG
579 * Setup the outgoing data buffer for the response (llm) by allocating the
580 * right amount of memory and copying the original information from the lsm
581 * structure.
ca95a216 582 *
d063d709 583 * Return total size of the buffer pointed by buf.
ca95a216 584 */
5461b305 585static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 586{
f3ed775e 587 int ret, buf_size;
ca95a216 588
f3ed775e 589 buf_size = size;
5461b305
DG
590
591 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
592 if (cmd_ctx->llm == NULL) {
ca95a216 593 perror("malloc");
5461b305 594 ret = -ENOMEM;
ca95a216
DG
595 goto error;
596 }
597
5461b305
DG
598 /* Copy common data */
599 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 600 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 601
5461b305
DG
602 cmd_ctx->llm->data_size = size;
603 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
604
ca95a216
DG
605 return buf_size;
606
607error:
608 return ret;
609}
610
7a485870 611/*
5eb91c98 612 * Update the kernel poll set of all channel fd available over all tracing
d063d709 613 * session. Add the wakeup pipe at the end of the set.
7a485870 614 */
5eb91c98 615static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 616{
5eb91c98 617 int ret;
7a485870
DG
618 struct ltt_session *session;
619 struct ltt_kernel_channel *channel;
620
5eb91c98 621 DBG("Updating kernel poll set");
7a485870 622
54d01ffb 623 session_lock_list();
b5541356 624 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 625 session_lock(session);
7a485870 626 if (session->kernel_session == NULL) {
54d01ffb 627 session_unlock(session);
7a485870
DG
628 continue;
629 }
7a485870 630
54d01ffb
DG
631 cds_list_for_each_entry(channel,
632 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
633 /* Add channel fd to the kernel poll set */
634 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
635 if (ret < 0) {
54d01ffb 636 session_unlock(session);
5eb91c98
DG
637 goto error;
638 }
639 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 640 }
54d01ffb 641 session_unlock(session);
7a485870 642 }
54d01ffb 643 session_unlock_list();
7a485870 644
5eb91c98 645 return 0;
7a485870
DG
646
647error:
54d01ffb 648 session_unlock_list();
7a485870
DG
649 return -1;
650}
651
652/*
54d01ffb 653 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 654 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 655 *
d063d709 656 * Useful for CPU hotplug feature.
7a485870 657 */
2bdd86d4 658static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
659{
660 int ret = 0;
661 struct ltt_session *session;
662 struct ltt_kernel_channel *channel;
663
664 DBG("Updating kernel streams for channel fd %d", fd);
665
54d01ffb 666 session_lock_list();
b5541356 667 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 668 session_lock(session);
7a485870 669 if (session->kernel_session == NULL) {
54d01ffb 670 session_unlock(session);
7a485870
DG
671 continue;
672 }
d9800920
DG
673
674 /* This is not suppose to be 0 but this is an extra security check */
675 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 676 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
677 }
678
5eb91c98
DG
679 cds_list_for_each_entry(channel,
680 &session->kernel_session->channel_list.head, list) {
7a485870
DG
681 if (channel->fd == fd) {
682 DBG("Channel found, updating kernel streams");
683 ret = kernel_open_channel_stream(channel);
684 if (ret < 0) {
b3c750d2 685 goto error;
7a485870 686 }
d9800920 687
7a485870 688 /*
5eb91c98
DG
689 * Have we already sent fds to the consumer? If yes, it means
690 * that tracing is started so it is safe to send our updated
691 * stream fds.
7a485870 692 */
3bd1e081 693 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 694 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 695 session->kernel_session->consumer_fd, channel);
7a485870 696 if (ret < 0) {
b3c750d2 697 goto error;
7a485870
DG
698 }
699 }
b3c750d2 700 goto error;
7a485870
DG
701 }
702 }
54d01ffb 703 session_unlock(session);
7a485870 704 }
54d01ffb 705 session_unlock_list();
b3c750d2 706 return ret;
7a485870 707
b3c750d2 708error:
54d01ffb
DG
709 session_unlock(session);
710 session_unlock_list();
7a485870
DG
711 return ret;
712}
713
714/*
d063d709 715 * This thread manage event coming from the kernel.
7a485870 716 *
d063d709
DG
717 * Features supported in this thread:
718 * -) CPU Hotplug
7a485870
DG
719 */
720static void *thread_manage_kernel(void *data)
721{
5eb91c98
DG
722 int ret, i, pollfd, update_poll_flag = 1;
723 uint32_t revents, nb_fd;
7a485870 724 char tmp;
5eb91c98 725 struct lttng_poll_event events;
7a485870
DG
726
727 DBG("Thread manage kernel started");
728
5eb91c98
DG
729 ret = create_thread_poll_set(&events, 2);
730 if (ret < 0) {
731 goto error;
732 }
733
734 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
735 if (ret < 0) {
736 goto error;
737 }
738
7a485870
DG
739 while (1) {
740 if (update_poll_flag == 1) {
5f822d0a
DG
741 /*
742 * Reset number of fd in the poll set. Always 2 since there is the thread
743 * quit pipe and the kernel pipe.
744 */
745 events.nb_fd = 2;
746
5eb91c98
DG
747 ret = update_kernel_poll(&events);
748 if (ret < 0) {
7a485870
DG
749 goto error;
750 }
751 update_poll_flag = 0;
752 }
753
5eb91c98
DG
754 nb_fd = LTTNG_POLL_GETNB(&events);
755
756 DBG("Thread kernel polling on %d fds", nb_fd);
757
758 /* Zeroed the poll events */
759 lttng_poll_reset(&events);
7a485870
DG
760
761 /* Poll infinite value of time */
5eb91c98 762 ret = lttng_poll_wait(&events, -1);
7a485870 763 if (ret < 0) {
7a485870
DG
764 goto error;
765 } else if (ret == 0) {
766 /* Should not happen since timeout is infinite */
85611738
DG
767 ERR("Return value of poll is 0 with an infinite timeout.\n"
768 "This should not have happened! Continuing...");
7a485870
DG
769 continue;
770 }
771
5eb91c98
DG
772 for (i = 0; i < nb_fd; i++) {
773 /* Fetch once the poll data */
774 revents = LTTNG_POLL_GETEV(&events, i);
775 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 776
5eb91c98
DG
777 /* Thread quit pipe has been closed. Killing thread. */
778 ret = check_thread_quit_pipe(pollfd, revents);
779 if (ret) {
780 goto error;
781 }
7a485870 782
5eb91c98
DG
783 /* Check for data on kernel pipe */
784 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
785 ret = read(kernel_poll_pipe[0], &tmp, 1);
786 update_poll_flag = 1;
787 continue;
788 } else {
789 /*
790 * New CPU detected by the kernel. Adding kernel stream to
791 * kernel session and updating the kernel consumer
792 */
793 if (revents & LPOLLIN) {
2bdd86d4 794 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
795 if (ret < 0) {
796 continue;
797 }
798 break;
799 /*
800 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
801 * and unregister kernel stream at this point.
802 */
7a485870 803 }
7a485870
DG
804 }
805 }
806 }
807
808error:
809 DBG("Kernel thread dying");
273ea72c
DG
810 close(kernel_poll_pipe[0]);
811 close(kernel_poll_pipe[1]);
5eb91c98
DG
812
813 lttng_poll_clean(&events);
814
7a485870
DG
815 return NULL;
816}
817
1d4b027a 818/*
3bd1e081 819 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 820 */
3bd1e081 821static void *thread_manage_consumer(void *data)
1d4b027a 822{
5eb91c98
DG
823 int sock = 0, i, ret, pollfd;
824 uint32_t revents, nb_fd;
1d4b027a 825 enum lttcomm_return_code code;
5eb91c98 826 struct lttng_poll_event events;
3bd1e081 827 struct consumer_data *consumer_data = data;
1d4b027a 828
3bd1e081 829 DBG("[thread] Manage consumer started");
1d4b027a 830
3bd1e081 831 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
832 if (ret < 0) {
833 goto error;
834 }
835
5eb91c98
DG
836 /*
837 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
838 * Nothing more will be added to this poll set.
839 */
840 ret = create_thread_poll_set(&events, 2);
841 if (ret < 0) {
842 goto error;
843 }
273ea72c 844
3bd1e081 845 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
846 if (ret < 0) {
847 goto error;
848 }
849
850 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
851
852 /* Inifinite blocking call, waiting for transmission */
5eb91c98 853 ret = lttng_poll_wait(&events, -1);
273ea72c 854 if (ret < 0) {
273ea72c
DG
855 goto error;
856 }
857
5eb91c98
DG
858 for (i = 0; i < nb_fd; i++) {
859 /* Fetch once the poll data */
860 revents = LTTNG_POLL_GETEV(&events, i);
861 pollfd = LTTNG_POLL_GETFD(&events, i);
862
863 /* Thread quit pipe has been closed. Killing thread. */
864 ret = check_thread_quit_pipe(pollfd, revents);
865 if (ret) {
866 goto error;
867 }
868
869 /* Event on the registration socket */
3bd1e081 870 if (pollfd == consumer_data->err_sock) {
5eb91c98 871 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 872 ERR("consumer err socket poll error");
5eb91c98
DG
873 goto error;
874 }
875 }
273ea72c
DG
876 }
877
3bd1e081 878 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
879 if (sock < 0) {
880 goto error;
881 }
882
3bd1e081 883 DBG2("Receiving code from consumer err_sock");
ee0b0061 884
712ea556 885 /* Getting status code from kconsumerd */
54d01ffb
DG
886 ret = lttcomm_recv_unix_sock(sock, &code,
887 sizeof(enum lttcomm_return_code));
1d4b027a
DG
888 if (ret <= 0) {
889 goto error;
890 }
891
3bd1e081
MD
892 if (code == CONSUMERD_COMMAND_SOCK_READY) {
893 consumer_data->cmd_sock =
894 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
895 if (consumer_data->cmd_sock < 0) {
896 sem_post(&consumer_data->sem);
48842b30 897 PERROR("consumer connect");
1d4b027a
DG
898 goto error;
899 }
900 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
901 sem_post(&consumer_data->sem);
902 DBG("consumer command socket ready");
1d4b027a 903 } else {
3bd1e081 904 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
905 lttcomm_get_readable_code(-code));
906 goto error;
907 }
908
54d01ffb 909 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 910 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 911 if (ret < 0) {
72079cae
DG
912 goto error;
913 }
914
5eb91c98
DG
915 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
916 if (ret < 0) {
72079cae 917 goto error;
5eb91c98
DG
918 }
919
920 /* Update number of fd */
921 nb_fd = LTTNG_POLL_GETNB(&events);
922
923 /* Inifinite blocking call, waiting for transmission */
924 ret = lttng_poll_wait(&events, -1);
925 if (ret < 0) {
72079cae
DG
926 goto error;
927 }
928
5eb91c98
DG
929 for (i = 0; i < nb_fd; i++) {
930 /* Fetch once the poll data */
931 revents = LTTNG_POLL_GETEV(&events, i);
932 pollfd = LTTNG_POLL_GETFD(&events, i);
933
934 /* Thread quit pipe has been closed. Killing thread. */
935 ret = check_thread_quit_pipe(pollfd, revents);
936 if (ret) {
937 goto error;
938 }
939
940 /* Event on the kconsumerd socket */
941 if (pollfd == sock) {
942 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 943 ERR("consumer err socket second poll error");
5eb91c98
DG
944 goto error;
945 }
946 }
947 }
948
712ea556 949 /* Wait for any kconsumerd error */
54d01ffb
DG
950 ret = lttcomm_recv_unix_sock(sock, &code,
951 sizeof(enum lttcomm_return_code));
712ea556 952 if (ret <= 0) {
3bd1e081 953 ERR("consumer closed the command socket");
712ea556 954 goto error;
6f61d021 955 }
1d4b027a 956
3bd1e081 957 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 958
1d4b027a 959error:
3bd1e081
MD
960 DBG("consumer thread dying");
961 close(consumer_data->err_sock);
962 close(consumer_data->cmd_sock);
5eb91c98 963 close(sock);
273ea72c 964
3bd1e081
MD
965 unlink(consumer_data->err_unix_sock_path);
966 unlink(consumer_data->cmd_unix_sock_path);
967 consumer_data->pid = 0;
1d4b027a 968
5eb91c98 969 lttng_poll_clean(&events);
0177d773 970
5eb91c98 971 return NULL;
099e26bd
DG
972}
973
099e26bd
DG
974/*
975 * This thread manage application communication.
1d4b027a
DG
976 */
977static void *thread_manage_apps(void *data)
099e26bd 978{
5eb91c98
DG
979 int i, ret, pollfd;
980 uint32_t revents, nb_fd;
099e26bd 981 struct ust_command ust_cmd;
5eb91c98 982 struct lttng_poll_event events;
099e26bd
DG
983
984 DBG("[thread] Manage application started");
985
f6a9efaa
DG
986 rcu_register_thread();
987 rcu_thread_online();
988
5eb91c98
DG
989 ret = create_thread_poll_set(&events, 2);
990 if (ret < 0) {
991 goto error;
992 }
099e26bd 993
5eb91c98
DG
994 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
995 if (ret < 0) {
996 goto error;
997 }
099e26bd 998
5eb91c98
DG
999 while (1) {
1000 /* Zeroed the events structure */
1001 lttng_poll_reset(&events);
0177d773 1002
5eb91c98 1003 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1004
1005 DBG("Apps thread polling on %d fds", nb_fd);
1006
1007 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1008 ret = lttng_poll_wait(&events, -1);
099e26bd 1009 if (ret < 0) {
099e26bd
DG
1010 goto error;
1011 }
1012
5eb91c98
DG
1013 for (i = 0; i < nb_fd; i++) {
1014 /* Fetch once the poll data */
1015 revents = LTTNG_POLL_GETEV(&events, i);
1016 pollfd = LTTNG_POLL_GETFD(&events, i);
1017
1018 /* Thread quit pipe has been closed. Killing thread. */
1019 ret = check_thread_quit_pipe(pollfd, revents);
1020 if (ret) {
099e26bd 1021 goto error;
5eb91c98 1022 }
099e26bd 1023
5eb91c98
DG
1024 /* Inspect the apps cmd pipe */
1025 if (pollfd == apps_cmd_pipe[0]) {
1026 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1027 ERR("Apps command pipe error");
0177d773 1028 goto error;
5eb91c98
DG
1029 } else if (revents & LPOLLIN) {
1030 /* Empty pipe */
1031 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1032 if (ret < 0 || ret < sizeof(ust_cmd)) {
1033 perror("read apps cmd pipe");
1034 goto error;
1035 }
099e26bd 1036
5eb91c98 1037 /* Register applicaton to the session daemon */
56fff090 1038 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1039 ust_cmd.sock);
5eb91c98
DG
1040 if (ret < 0) {
1041 /* Only critical ENOMEM error can be returned here */
1042 goto error;
1043 }
1044
1045 ret = ustctl_register_done(ust_cmd.sock);
1046 if (ret < 0) {
1047 /*
1048 * If the registration is not possible, we simply
1049 * unregister the apps and continue
1050 */
56fff090 1051 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1052 } else {
1053 /*
1054 * We just need here to monitor the close of the UST
1055 * socket and poll set monitor those by default.
1056 */
1057 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1058 if (ret < 0) {
1059 goto error;
1060 }
1061
54d01ffb
DG
1062 DBG("Apps with sock %d added to poll set",
1063 ust_cmd.sock);
5eb91c98
DG
1064 }
1065 break;
0177d773 1066 }
5eb91c98
DG
1067 } else {
1068 /*
54d01ffb
DG
1069 * At this point, we know that a registered application made
1070 * the event at poll_wait.
5eb91c98
DG
1071 */
1072 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1073 /* Removing from the poll set */
1074 ret = lttng_poll_del(&events, pollfd);
1075 if (ret < 0) {
1076 goto error;
1077 }
099e26bd 1078
5eb91c98 1079 /* Socket closed */
56fff090 1080 ust_app_unregister(pollfd);
5eb91c98
DG
1081 break;
1082 }
099e26bd
DG
1083 }
1084 }
099e26bd
DG
1085 }
1086
1087error:
1088 DBG("Application communication apps dying");
1089 close(apps_cmd_pipe[0]);
1090 close(apps_cmd_pipe[1]);
1091
5eb91c98 1092 lttng_poll_clean(&events);
099e26bd 1093
f6a9efaa
DG
1094 rcu_thread_offline();
1095 rcu_unregister_thread();
099e26bd
DG
1096 return NULL;
1097}
1098
1099/*
1100 * Dispatch request from the registration threads to the application
1101 * communication thread.
1102 */
1103static void *thread_dispatch_ust_registration(void *data)
1104{
1105 int ret;
1106 struct cds_wfq_node *node;
1107 struct ust_command *ust_cmd = NULL;
1108
1109 DBG("[thread] Dispatch UST command started");
1110
1111 while (!dispatch_thread_exit) {
1112 /* Atomically prepare the queue futex */
1113 futex_nto1_prepare(&ust_cmd_queue.futex);
1114
1115 do {
1116 /* Dequeue command for registration */
1117 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1118 if (node == NULL) {
00a17c97 1119 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1120 /* Continue thread execution */
1121 break;
1122 }
1123
1124 ust_cmd = caa_container_of(node, struct ust_command, node);
1125
2f50c8a3
DG
1126 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1127 " gid:%d sock:%d name:%s (version %d.%d)",
1128 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1129 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1130 ust_cmd->sock, ust_cmd->reg_msg.name,
1131 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1132 /*
1133 * Inform apps thread of the new application registration. This
1134 * call is blocking so we can be assured that the data will be read
1135 * at some point in time or wait to the end of the world :)
1136 */
1137 ret = write(apps_cmd_pipe[1], ust_cmd,
1138 sizeof(struct ust_command));
1139 if (ret < 0) {
1140 perror("write apps cmd pipe");
1141 if (errno == EBADF) {
1142 /*
1143 * We can't inform the application thread to process
1144 * registration. We will exit or else application
1145 * registration will not occur and tracing will never
1146 * start.
1147 */
1148 goto error;
1149 }
1150 }
1151 free(ust_cmd);
1152 } while (node != NULL);
1153
1154 /* Futex wait on queue. Blocking call on futex() */
1155 futex_nto1_wait(&ust_cmd_queue.futex);
1156 }
1157
1158error:
1159 DBG("Dispatch thread dying");
1160 return NULL;
1161}
1162
1163/*
1164 * This thread manage application registration.
1165 */
1166static void *thread_registration_apps(void *data)
1d4b027a 1167{
5eb91c98
DG
1168 int sock = 0, i, ret, pollfd;
1169 uint32_t revents, nb_fd;
1170 struct lttng_poll_event events;
099e26bd
DG
1171 /*
1172 * Get allocated in this thread, enqueued to a global queue, dequeued and
1173 * freed in the manage apps thread.
1174 */
1175 struct ust_command *ust_cmd = NULL;
1d4b027a 1176
099e26bd 1177 DBG("[thread] Manage application registration started");
1d4b027a
DG
1178
1179 ret = lttcomm_listen_unix_sock(apps_sock);
1180 if (ret < 0) {
1181 goto error;
1182 }
1183
5eb91c98
DG
1184 /*
1185 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1186 * more will be added to this poll set.
1187 */
1188 ret = create_thread_poll_set(&events, 2);
1189 if (ret < 0) {
1190 goto error;
1191 }
273ea72c 1192
5eb91c98
DG
1193 /* Add the application registration socket */
1194 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1195 if (ret < 0) {
1196 goto error;
1197 }
273ea72c 1198
1d4b027a 1199 /* Notify all applications to register */
0fdd1e2c
DG
1200 ret = notify_ust_apps(1);
1201 if (ret < 0) {
1202 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1203 "Execution continues but there might be problem for already\n"
1204 "running applications that wishes to register.");
0fdd1e2c 1205 }
1d4b027a
DG
1206
1207 while (1) {
1208 DBG("Accepting application registration");
273ea72c 1209
5eb91c98
DG
1210 nb_fd = LTTNG_POLL_GETNB(&events);
1211
273ea72c 1212 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1213 ret = lttng_poll_wait(&events, -1);
273ea72c 1214 if (ret < 0) {
273ea72c
DG
1215 goto error;
1216 }
1217
5eb91c98
DG
1218 for (i = 0; i < nb_fd; i++) {
1219 /* Fetch once the poll data */
1220 revents = LTTNG_POLL_GETEV(&events, i);
1221 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1222
5eb91c98
DG
1223 /* Thread quit pipe has been closed. Killing thread. */
1224 ret = check_thread_quit_pipe(pollfd, revents);
1225 if (ret) {
90014c57
DG
1226 goto error;
1227 }
1d4b027a 1228
5eb91c98
DG
1229 /* Event on the registration socket */
1230 if (pollfd == apps_sock) {
1231 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1232 ERR("Register apps socket poll error");
1233 goto error;
1234 } else if (revents & LPOLLIN) {
1235 sock = lttcomm_accept_unix_sock(apps_sock);
1236 if (sock < 0) {
1237 goto error;
1238 }
099e26bd 1239
5eb91c98
DG
1240 /* Create UST registration command for enqueuing */
1241 ust_cmd = malloc(sizeof(struct ust_command));
1242 if (ust_cmd == NULL) {
1243 perror("ust command malloc");
1244 goto error;
1245 }
1d4b027a 1246
5eb91c98
DG
1247 /*
1248 * Using message-based transmissions to ensure we don't
1249 * have to deal with partially received messages.
1250 */
1251 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1252 sizeof(struct ust_register_msg));
1253 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1254 if (ret < 0) {
1255 perror("lttcomm_recv_unix_sock register apps");
1256 } else {
1257 ERR("Wrong size received on apps register");
1258 }
1259 free(ust_cmd);
1260 close(sock);
1261 continue;
1262 }
099e26bd 1263
5eb91c98 1264 ust_cmd->sock = sock;
099e26bd 1265
5eb91c98
DG
1266 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1267 " gid:%d sock:%d name:%s (version %d.%d)",
1268 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1269 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1270 ust_cmd->sock, ust_cmd->reg_msg.name,
1271 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1272
5eb91c98
DG
1273 /*
1274 * Lock free enqueue the registration request. The red pill
54d01ffb 1275 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1276 */
1277 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1278
1279 /*
1280 * Wake the registration queue futex. Implicit memory
1281 * barrier with the exchange in cds_wfq_enqueue.
1282 */
1283 futex_nto1_wake(&ust_cmd_queue.futex);
1284 }
1285 }
90014c57 1286 }
1d4b027a
DG
1287 }
1288
1289error:
0fdd1e2c
DG
1290 DBG("UST Registration thread dying");
1291
1292 /* Notify that the registration thread is gone */
1293 notify_ust_apps(0);
1294
1295 close(apps_sock);
1296 close(sock);
273ea72c 1297 unlink(apps_unix_sock_path);
0fdd1e2c 1298
5eb91c98
DG
1299 lttng_poll_clean(&events);
1300
1d4b027a
DG
1301 return NULL;
1302}
1303
8c0faa1d 1304/*
3bd1e081 1305 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1306 * exec or it will fails.
8c0faa1d 1307 */
3bd1e081 1308static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1309{
1310 int ret;
ee0b0061
DG
1311 struct timespec timeout;
1312
1313 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1314 timeout.tv_nsec = 0;
8c0faa1d
DG
1315
1316 /* Setup semaphore */
3bd1e081 1317 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1318 if (ret < 0) {
3bd1e081 1319 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1320 goto error;
1321 }
8c0faa1d 1322
3bd1e081
MD
1323 ret = pthread_create(&consumer_data->thread, NULL,
1324 thread_manage_consumer, consumer_data);
8c0faa1d 1325 if (ret != 0) {
3bd1e081 1326 PERROR("pthread_create consumer");
ee0b0061 1327 ret = -1;
8c0faa1d
DG
1328 goto error;
1329 }
1330
ee0b0061
DG
1331 /* Get time for sem_timedwait absolute timeout */
1332 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1333 if (ret < 0) {
3bd1e081 1334 PERROR("clock_gettime spawn consumer");
ee0b0061 1335 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1336 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1337 } else {
1338 /* Normal timeout if the gettime was successful */
1339 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1340 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1341 }
8c0faa1d 1342
ee0b0061
DG
1343 if (ret < 0) {
1344 if (errno == ETIMEDOUT) {
1345 /*
1346 * Call has timed out so we kill the kconsumerd_thread and return
1347 * an error.
1348 */
3bd1e081
MD
1349 ERR("The consumer thread was never ready. Killing it");
1350 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1351 if (ret < 0) {
3bd1e081 1352 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1353 }
1354 } else {
3bd1e081 1355 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1356 }
1357 goto error;
1358 }
1359
3bd1e081
MD
1360 pthread_mutex_lock(&consumer_data->pid_mutex);
1361 if (consumer_data->pid == 0) {
712ea556 1362 ERR("Kconsumerd did not start");
3bd1e081 1363 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1364 goto error;
1365 }
3bd1e081 1366 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1367
8c0faa1d
DG
1368 return 0;
1369
1370error:
1371 return ret;
1372}
1373
d9800920 1374/*
3bd1e081 1375 * Join consumer thread
d9800920 1376 */
3bd1e081 1377static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1378{
1379 void *status;
1380 int ret;
1381
3bd1e081
MD
1382 if (consumer_data->pid != 0) {
1383 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1384 if (ret) {
3bd1e081 1385 ERR("Error killing consumer daemon");
cf3af59e
MD
1386 return ret;
1387 }
3bd1e081 1388 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1389 } else {
1390 return 0;
1391 }
1392}
1393
8c0faa1d 1394/*
3bd1e081 1395 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1396 *
d063d709 1397 * Return pid if successful else -1.
8c0faa1d 1398 */
3bd1e081 1399static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1400{
1401 int ret;
1402 pid_t pid;
53086306 1403 const char *verbosity;
8c0faa1d 1404
3bd1e081 1405 DBG("Spawning consumerd");
c49dc785 1406
8c0faa1d
DG
1407 pid = fork();
1408 if (pid == 0) {
1409 /*
3bd1e081 1410 * Exec consumerd.
8c0faa1d 1411 */
3bd1e081 1412 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG
1413 verbosity = "--verbose";
1414 } else {
1415 verbosity = "--quiet";
1416 }
3bd1e081
MD
1417 switch (consumer_data->type) {
1418 case LTTNG_CONSUMER_KERNEL:
1419 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1420 "lttng-consumerd", verbosity, "-k", NULL);
1421 break;
1422 case LTTNG_CONSUMER_UST:
1423 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1424 "lttng-consumerd", verbosity, "-u", NULL);
1425 break;
1426 default:
1427 perror("unknown consumer type");
1428 exit(EXIT_FAILURE);
1429 }
8c0faa1d
DG
1430 if (errno != 0) {
1431 perror("kernel start consumer exec");
1432 }
1433 exit(EXIT_FAILURE);
1434 } else if (pid > 0) {
1435 ret = pid;
8c0faa1d 1436 } else {
3bd1e081 1437 perror("start consumer fork");
8c0faa1d 1438 ret = -errno;
8c0faa1d 1439 }
8c0faa1d
DG
1440 return ret;
1441}
1442
693bd40b 1443/*
3bd1e081 1444 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1445 */
3bd1e081 1446static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1447{
1448 int ret;
1449
3bd1e081
MD
1450 pthread_mutex_lock(&consumer_data->pid_mutex);
1451 if (consumer_data->pid != 0) {
1452 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1453 goto end;
1454 }
693bd40b 1455
3bd1e081 1456 ret = spawn_consumerd(consumer_data);
c49dc785 1457 if (ret < 0) {
3bd1e081
MD
1458 ERR("Spawning consumerd failed");
1459 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1460 goto error;
693bd40b 1461 }
c49dc785 1462
3bd1e081
MD
1463 /* Setting up the consumer_data pid */
1464 consumer_data->pid = ret;
48842b30 1465 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1466 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1467
3bd1e081
MD
1468 DBG2("Spawning consumer control thread");
1469 ret = spawn_consumer_thread(consumer_data);
693bd40b 1470 if (ret < 0) {
3bd1e081 1471 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1472 goto error;
1473 }
1474
c49dc785 1475end:
693bd40b
DG
1476 return 0;
1477
1478error:
1479 return ret;
1480}
1481
b73401da 1482/*
d063d709 1483 * modprobe_kernel_modules
b73401da
DG
1484 */
1485static int modprobe_kernel_modules(void)
1486{
ab147185 1487 int ret = 0, i;
b73401da
DG
1488 char modprobe[256];
1489
ab147185
MD
1490 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1491 ret = snprintf(modprobe, sizeof(modprobe),
1492 "/sbin/modprobe %s%s",
24b487b8 1493 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1494 kernel_modules_list[i].name);
b73401da
DG
1495 if (ret < 0) {
1496 perror("snprintf modprobe");
1497 goto error;
1498 }
ab147185 1499 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1500 ret = system(modprobe);
ab147185
MD
1501 if (ret == -1) {
1502 ERR("Unable to launch modprobe for module %s",
1503 kernel_modules_list[i].name);
1504 } else if (kernel_modules_list[i].required
d9800920 1505 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1506 ERR("Unable to load module %s",
1507 kernel_modules_list[i].name);
1508 } else {
1509 DBG("Modprobe successfully %s",
1510 kernel_modules_list[i].name);
1511 }
1512 }
1513
1514error:
1515 return ret;
1516}
1517
b73401da 1518/*
d063d709 1519 * mount_debugfs
b73401da
DG
1520 */
1521static int mount_debugfs(char *path)
1522{
1523 int ret;
1524 char *type = "debugfs";
1525
996b65c8 1526 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1527 if (ret < 0) {
7272acf5 1528 PERROR("Cannot create debugfs path");
b73401da
DG
1529 goto error;
1530 }
1531
1532 ret = mount(type, path, type, 0, NULL);
1533 if (ret < 0) {
7272acf5 1534 PERROR("Cannot mount debugfs");
b73401da
DG
1535 goto error;
1536 }
1537
1538 DBG("Mounted debugfs successfully at %s", path);
1539
1540error:
1541 return ret;
1542}
1543
8c0faa1d 1544/*
d063d709 1545 * Setup necessary data for kernel tracer action.
8c0faa1d 1546 */
f3ed775e 1547static void init_kernel_tracer(void)
8c0faa1d 1548{
b73401da
DG
1549 int ret;
1550 char *proc_mounts = "/proc/mounts";
1551 char line[256];
684d34d2 1552 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1553 FILE *fp;
1554
1555 /* Detect debugfs */
1556 fp = fopen(proc_mounts, "r");
1557 if (fp == NULL) {
1558 ERR("Unable to probe %s", proc_mounts);
1559 goto error;
1560 }
1561
1562 while (fgets(line, sizeof(line), fp) != NULL) {
1563 if (strstr(line, "debugfs") != NULL) {
1564 /* Remove first string */
1565 strtok(line, " ");
1566 /* Dup string here so we can reuse line later on */
1567 debugfs_path = strdup(strtok(NULL, " "));
1568 DBG("Got debugfs path : %s", debugfs_path);
1569 break;
1570 }
1571 }
1572
1573 fclose(fp);
1574
1575 /* Mount debugfs if needded */
1576 if (debugfs_path == NULL) {
1577 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1578 if (ret < 0) {
1579 perror("asprintf debugfs path");
1580 goto error;
1581 }
1582 ret = mount_debugfs(debugfs_path);
1583 if (ret < 0) {
7272acf5 1584 perror("Cannot mount debugfs");
b73401da
DG
1585 goto error;
1586 }
1587 }
1588
1589 /* Modprobe lttng kernel modules */
1590 ret = modprobe_kernel_modules();
1591 if (ret < 0) {
1592 goto error;
1593 }
1594
1595 /* Setup lttng kernel path */
1596 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1597 if (ret < 0) {
1598 perror("asprintf lttng path");
1599 goto error;
1600 }
1601
1602 /* Open debugfs lttng */
1603 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1604 if (kernel_tracer_fd < 0) {
b73401da
DG
1605 DBG("Failed to open %s", lttng_path);
1606 goto error;
8c0faa1d
DG
1607 }
1608
b73401da
DG
1609 free(lttng_path);
1610 free(debugfs_path);
f3ed775e 1611 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1612 return;
1613
1614error:
1615 if (lttng_path) {
1616 free(lttng_path);
1617 }
1618 if (debugfs_path) {
1619 free(debugfs_path);
1620 }
1621 WARN("No kernel tracer available");
1622 kernel_tracer_fd = 0;
1623 return;
f3ed775e 1624}
33a2b854 1625
f3ed775e 1626/*
54d01ffb 1627 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1628 */
54d01ffb 1629static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1630{
f40799e8 1631 int ret = 0;
8c0faa1d 1632
3bd1e081 1633 if (session->consumer_fds_sent == 0) {
d9800920 1634 /*
54d01ffb
DG
1635 * Assign default kernel consumer socket if no consumer assigned to the
1636 * kernel session. At this point, it's NOT suppose to be 0 but this is
1637 * an extra security check.
d9800920
DG
1638 */
1639 if (session->consumer_fd == 0) {
3bd1e081 1640 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1641 }
1642
2bdd86d4 1643 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1644 if (ret < 0) {
f3ed775e
DG
1645 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1646 goto error;
1647 }
1d4b027a 1648
3bd1e081 1649 session->consumer_fds_sent = 1;
f3ed775e 1650 }
1d4b027a
DG
1651
1652error:
1653 return ret;
8c0faa1d
DG
1654}
1655
0177d773
DG
1656/*
1657 * Create an UST session and add it to the session ust list.
1658 */
44d3bd01
DG
1659static int create_ust_session(struct ltt_session *session,
1660 struct lttng_domain *domain)
0177d773 1661{
44d3bd01 1662 int ret;
48842b30 1663 unsigned int uid;
13384287 1664 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1665
1666 switch (domain->type) {
48842b30 1667 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1668 break;
1669 default:
13384287 1670 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1671 goto error;
1672 }
0177d773
DG
1673
1674 DBG("Creating UST session");
1675
48842b30
DG
1676 session_lock_list();
1677 uid = session_list_ptr->count;
1678 session_unlock_list();
1679
1680 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1681 if (lus == NULL) {
44d3bd01 1682 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1683 goto error;
1684 }
1685
48842b30 1686 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG
1687 geteuid(), allowed_group());
1688 if (ret < 0) {
1689 if (ret != -EEXIST) {
1690 ERR("Trace directory creation error");
44d3bd01 1691 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1692 goto error;
1693 }
1694 }
1695
f6a9efaa
DG
1696 /* The domain type dictate different actions on session creation */
1697 switch (domain->type) {
48842b30
DG
1698 case LTTNG_DOMAIN_UST:
1699 /* No ustctl for the global UST domain */
1700 break;
1701 default:
1702 goto error;
0177d773 1703 }
f6a9efaa 1704 session->ust_session = lus;
44d3bd01
DG
1705
1706 return LTTCOMM_OK;
0177d773
DG
1707
1708error:
1709 free(lus);
1710 return ret;
1711}
1712
333f285e 1713/*
d063d709 1714 * Create a kernel tracer session then create the default channel.
333f285e 1715 */
f3ed775e 1716static int create_kernel_session(struct ltt_session *session)
333f285e 1717{
f3ed775e 1718 int ret;
f3ed775e
DG
1719
1720 DBG("Creating kernel session");
1721
1722 ret = kernel_create_session(session, kernel_tracer_fd);
1723 if (ret < 0) {
1724 ret = LTTCOMM_KERN_SESS_FAIL;
1725 goto error;
333f285e
DG
1726 }
1727
d9800920 1728 /* Set kernel consumer socket fd */
3bd1e081
MD
1729 if (kconsumer_data.cmd_sock) {
1730 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1731 }
1732
63053e7c
DG
1733 ret = mkdir_recursive(session->kernel_session->trace_path,
1734 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1735 if (ret < 0) {
996b65c8 1736 if (ret != -EEXIST) {
7a485870
DG
1737 ERR("Trace directory creation error");
1738 goto error;
1739 }
1740 }
1741
f3ed775e
DG
1742error:
1743 return ret;
333f285e
DG
1744}
1745
6c9cc2ab
DG
1746/*
1747 * Using the session list, filled a lttng_session array to send back to the
1748 * client for session listing.
1749 *
1750 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1751 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1752 */
1753static void list_lttng_sessions(struct lttng_session *sessions)
1754{
1755 int i = 0;
1756 struct ltt_session *session;
1757
1758 DBG("Getting all available session");
1759 /*
1760 * Iterate over session list and append data after the control struct in
1761 * the buffer.
1762 */
1763 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1764 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1765 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1766 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1767 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG
1768 i++;
1769 }
1770}
1771
9f19cc17
DG
1772/*
1773 * Fill lttng_channel array of all channels.
1774 */
1775static void list_lttng_channels(struct ltt_session *session,
1776 struct lttng_channel *channels)
1777{
1778 int i = 0;
1779 struct ltt_kernel_channel *kchan;
1780
1781 DBG("Listing channels for session %s", session->name);
1782
1783 /* Kernel channels */
1784 if (session->kernel_session != NULL) {
54d01ffb
DG
1785 cds_list_for_each_entry(kchan,
1786 &session->kernel_session->channel_list.head, list) {
9f19cc17
DG
1787 /* Copy lttng_channel struct to array */
1788 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1789 channels[i].enabled = kchan->enabled;
1790 i++;
1791 }
1792 }
1793
1794 /* TODO: Missing UST listing */
1795}
1796
1797/*
1798 * Fill lttng_event array of all events in the channel.
1799 */
1800static void list_lttng_events(struct ltt_kernel_channel *kchan,
1801 struct lttng_event *events)
1802{
1803 /*
1804 * TODO: This is ONLY kernel. Need UST support.
1805 */
1806 int i = 0;
1807 struct ltt_kernel_event *event;
1808
1809 DBG("Listing events for channel %s", kchan->channel->name);
1810
1811 /* Kernel channels */
1812 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1813 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1814 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG
1815 events[i].enabled = event->enabled;
1816 switch (event->event->instrumentation) {
1817 case LTTNG_KERNEL_TRACEPOINT:
1818 events[i].type = LTTNG_EVENT_TRACEPOINT;
1819 break;
1820 case LTTNG_KERNEL_KPROBE:
1821 case LTTNG_KERNEL_KRETPROBE:
1822 events[i].type = LTTNG_EVENT_PROBE;
1823 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1824 sizeof(struct lttng_kernel_kprobe));
1825 break;
1826 case LTTNG_KERNEL_FUNCTION:
1827 events[i].type = LTTNG_EVENT_FUNCTION;
1828 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1829 sizeof(struct lttng_kernel_function));
1830 break;
0133c199
MD
1831 case LTTNG_KERNEL_NOOP:
1832 events[i].type = LTTNG_EVENT_NOOP;
1833 break;
a54bd42d
MD
1834 case LTTNG_KERNEL_SYSCALL:
1835 events[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1836 break;
7a3d1328
MD
1837 case LTTNG_KERNEL_ALL:
1838 assert(0);
1839 break;
9f19cc17
DG
1840 }
1841 i++;
1842 }
1843}
1844
fac6795d 1845/*
54d01ffb 1846 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1847 */
54d01ffb
DG
1848static int cmd_disable_channel(struct ltt_session *session,
1849 int domain, char *channel_name)
fac6795d 1850{
54d01ffb 1851 int ret;
379473d2 1852
54d01ffb
DG
1853 switch (domain) {
1854 case LTTNG_DOMAIN_KERNEL:
1855 ret = channel_kernel_disable(session->kernel_session,
1856 channel_name);
1857 if (ret != LTTCOMM_OK) {
333f285e
DG
1858 goto error;
1859 }
54d01ffb
DG
1860
1861 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 1862 break;
44d3bd01
DG
1863 case LTTNG_DOMAIN_UST_PID:
1864 break;
d0254c7c 1865 default:
44d3bd01 1866 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 1867 goto error;
20fe2104
DG
1868 }
1869
54d01ffb 1870 ret = LTTCOMM_OK;
d65106b1 1871
54d01ffb
DG
1872error:
1873 return ret;
1874}
1875
56fff090
DG
1876/*
1877 * Copy channel from attributes and set it in the application channel list.
1878 */
f6a9efaa 1879/*
56fff090
DG
1880static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
1881 struct lttng_channel *attr, struct ust_app *app)
1882{
1883 int ret;
1884 struct ltt_ust_channel *uchan, *new_chan;
1885
f6a9efaa 1886 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
1887 if (uchan == NULL) {
1888 ret = LTTCOMM_FATAL;
1889 goto error;
1890 }
1891
1892 new_chan = trace_ust_create_channel(attr, usess->path);
1893 if (new_chan == NULL) {
1894 PERROR("malloc ltt_ust_channel");
1895 ret = LTTCOMM_FATAL;
1896 goto error;
1897 }
1898
1899 ret = channel_ust_copy(new_chan, uchan);
1900 if (ret < 0) {
1901 ret = LTTCOMM_FATAL;
1902 goto error;
1903 }
1904
56fff090
DG
1905error:
1906 return ret;
1907}
f6a9efaa 1908*/
56fff090 1909
54d01ffb
DG
1910/*
1911 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1912 */
44d3bd01
DG
1913static int cmd_enable_channel(struct ltt_session *session,
1914 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG
1915{
1916 int ret;
f6a9efaa
DG
1917 struct ltt_ust_session *usess = session->ust_session;
1918
1919 DBG("Enabling channel %s for session %s", session->name, attr->name);
d65106b1 1920
44d3bd01
DG
1921 switch (domain->type) {
1922 case LTTNG_DOMAIN_KERNEL:
1923 {
1924 struct ltt_kernel_channel *kchan;
54d01ffb 1925
44d3bd01
DG
1926 kchan = trace_kernel_get_channel_by_name(attr->name,
1927 session->kernel_session);
1928 if (kchan == NULL) {
1929 ret = channel_kernel_create(session->kernel_session,
1930 attr, kernel_poll_pipe[1]);
1931 } else {
1932 ret = channel_kernel_enable(session->kernel_session, kchan);
1933 }
1934
1935 if (ret != LTTCOMM_OK) {
1936 goto error;
1937 }
1938
1939 kernel_wait_quiescent(kernel_tracer_fd);
1940 break;
1941 }
f6a9efaa
DG
1942 case LTTNG_DOMAIN_UST:
1943 {
1944 struct ltt_ust_channel *uchan;
1945
48842b30 1946 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 1947
48842b30 1948 /* Get channel in global UST domain HT */
f6a9efaa
DG
1949 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1950 attr->name);
1951 if (uchan == NULL) {
48842b30 1952 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
1953 if (uchan == NULL) {
1954 ret = LTTCOMM_UST_CHAN_FAIL;
1955 goto error;
1956 }
1957 rcu_read_lock();
1958 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
1959 rcu_read_unlock();
48842b30 1960 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa
DG
1961 } else {
1962 ret = LTTCOMM_UST_CHAN_EXIST;
1963 goto error;
1964 }
1965
48842b30
DG
1966 ret = ust_app_add_channel(usess, uchan);
1967 if (ret != LTTCOMM_OK) {
1968 goto error;
1969 }
f6a9efaa
DG
1970
1971 break;
1972 }
44d3bd01
DG
1973 case LTTNG_DOMAIN_UST_PID:
1974 {
f6a9efaa 1975 /*
56fff090
DG
1976 int sock;
1977 struct ltt_ust_channel *uchan;
44d3bd01 1978 struct ltt_ust_session *usess;
56fff090 1979 struct ust_app *app;
44d3bd01
DG
1980
1981 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
1982 domain->attr.pid);
1983 if (usess == NULL) {
1984 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
1985 goto error;
1986 }
1987
56fff090 1988 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
1989 if (app == NULL) {
1990 ret = LTTCOMM_APP_NOT_FOUND;
1991 goto error;
1992 }
56fff090 1993 sock = app->sock;
44d3bd01
DG
1994
1995 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1996 if (uchan == NULL) {
56fff090 1997 ret = channel_ust_create(usess, attr, sock);
44d3bd01 1998 } else {
56fff090 1999 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG
2000 }
2001
2002 if (ret != LTTCOMM_OK) {
2003 goto error;
2004 }
2005
56fff090
DG
2006 ret = copy_ust_channel_to_app(usess, attr, app);
2007 if (ret != LTTCOMM_OK) {
44d3bd01
DG
2008 goto error;
2009 }
2010
44d3bd01
DG
2011 DBG("UST channel %s created for app sock %d with pid %d",
2012 attr->name, app->sock, domain->attr.pid);
f6a9efaa
DG
2013 */
2014 ret = LTTCOMM_NOT_IMPLEMENTED;
2015 goto error;
44d3bd01
DG
2016 }
2017 default:
2018 ret = LTTCOMM_UNKNOWN_DOMAIN;
2019 goto error;
54d01ffb
DG
2020 }
2021
2022 ret = LTTCOMM_OK;
2023
2024error:
2025 return ret;
2026}
2027
2028/*
2029 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2030 */
2031static int cmd_disable_event(struct ltt_session *session, int domain,
2032 char *channel_name, char *event_name)
2033{
2034 int ret;
54d01ffb
DG
2035
2036 switch (domain) {
2037 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2038 {
2039 struct ltt_kernel_channel *kchan;
2040
54d01ffb
DG
2041 kchan = trace_kernel_get_channel_by_name(channel_name,
2042 session->kernel_session);
2043 if (kchan == NULL) {
2044 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2045 goto error;
d65106b1
DG
2046 }
2047
7a3d1328 2048 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG
2049 if (ret != LTTCOMM_OK) {
2050 goto error;
2051 }
2052
2053 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2054 break;
2bdd86d4
MD
2055 }
2056 case LTTNG_DOMAIN_UST:
2bdd86d4
MD
2057 case LTTNG_DOMAIN_UST_EXEC_NAME:
2058 case LTTNG_DOMAIN_UST_PID:
2059 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2060 default:
2bdd86d4 2061 /* TODO: Other UST domains */
54d01ffb
DG
2062 ret = LTTCOMM_NOT_IMPLEMENTED;
2063 goto error;
d65106b1 2064 }
26cc6b4e 2065
54d01ffb
DG
2066 ret = LTTCOMM_OK;
2067
2068error:
2069 return ret;
2070}
2071
2072/*
2073 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2074 */
2075static int cmd_disable_event_all(struct ltt_session *session, int domain,
2076 char *channel_name)
2077{
2078 int ret;
2079 struct ltt_kernel_channel *kchan;
2080
2081 switch (domain) {
2082 case LTTNG_DOMAIN_KERNEL:
2083 kchan = trace_kernel_get_channel_by_name(channel_name,
2084 session->kernel_session);
2085 if (kchan == NULL) {
2086 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2087 goto error;
26cc6b4e
DG
2088 }
2089
54d01ffb
DG
2090 ret = event_kernel_disable_all(session->kernel_session, kchan);
2091 if (ret != LTTCOMM_OK) {
0b97ec54 2092 goto error;
26cc6b4e
DG
2093 }
2094
54d01ffb 2095 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2096 break;
54d01ffb
DG
2097 default:
2098 /* TODO: Userspace tracing */
2099 ret = LTTCOMM_NOT_IMPLEMENTED;
2100 goto error;
26cc6b4e 2101 }
e953ef25 2102
54d01ffb 2103 ret = LTTCOMM_OK;
e953ef25 2104
54d01ffb
DG
2105error:
2106 return ret;
2107}
f5177a38 2108
54d01ffb
DG
2109/*
2110 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2111 */
2112static int cmd_add_context(struct ltt_session *session, int domain,
2113 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2114{
2115 int ret;
f5177a38 2116
54d01ffb
DG
2117 switch (domain) {
2118 case LTTNG_DOMAIN_KERNEL:
2119 /* Add kernel context to kernel tracer */
2120 ret = context_kernel_add(session->kernel_session, ctx,
2121 event_name, channel_name);
2122 if (ret != LTTCOMM_OK) {
f5177a38 2123 goto error;
e953ef25 2124 }
2bdd86d4
MD
2125 break;
2126 case LTTNG_DOMAIN_UST:
2127 {
48842b30
DG
2128 /*
2129 struct ltt_ust_session *usess;
e953ef25 2130
48842b30
DG
2131 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2132 ret = context_ust_add(usess, ctx,
2133 event_name, channel_name, domain);
2bdd86d4
MD
2134 if (ret != LTTCOMM_OK) {
2135 goto error;
2136 }
2137 }
e953ef25 2138 break;
48842b30 2139 */
2bdd86d4 2140 }
54d01ffb 2141 default:
2bdd86d4 2142 /* TODO: UST other domains */
54d01ffb
DG
2143 ret = LTTCOMM_NOT_IMPLEMENTED;
2144 goto error;
e953ef25 2145 }
950131af 2146
54d01ffb 2147 ret = LTTCOMM_OK;
950131af 2148
54d01ffb
DG
2149error:
2150 return ret;
2151}
2152
2153/*
2154 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2155 */
2156static int cmd_enable_event(struct ltt_session *session, int domain,
2157 char *channel_name, struct lttng_event *event)
2158{
2159 int ret;
f6cd6b0f 2160 struct lttng_channel *attr;
48842b30 2161 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2162
2163 switch (domain) {
2164 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2165 {
2166 struct ltt_kernel_channel *kchan;
2167
54d01ffb
DG
2168 kchan = trace_kernel_get_channel_by_name(channel_name,
2169 session->kernel_session);
2170 if (kchan == NULL) {
f6cd6b0f
DG
2171 attr = channel_new_default_attr(domain);
2172 if (attr == NULL) {
2173 ret = LTTCOMM_FATAL;
2174 goto error;
2175 }
2176 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2177
54d01ffb 2178 /* This call will notify the kernel thread */
44d3bd01 2179 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2180 attr, kernel_poll_pipe[1]);
54d01ffb 2181 if (ret != LTTCOMM_OK) {
f5177a38
DG
2182 goto error;
2183 }
54d01ffb 2184 }
950131af 2185
54d01ffb
DG
2186 /* Get the newly created kernel channel pointer */
2187 kchan = trace_kernel_get_channel_by_name(channel_name,
2188 session->kernel_session);
2189 if (kchan == NULL) {
2190 /* This sould not happen... */
2191 ret = LTTCOMM_FATAL;
2192 goto error;
2193 }
f5177a38 2194
48842b30
DG
2195 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2196 event);
54d01ffb 2197 if (ret != LTTCOMM_OK) {
f5177a38 2198 goto error;
950131af
DG
2199 }
2200
54d01ffb 2201 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2202 break;
2bdd86d4
MD
2203 }
2204 case LTTNG_DOMAIN_UST:
2205 {
48842b30
DG
2206 struct ltt_ust_channel *uchan;
2207 struct ltt_ust_event *uevent;
2bdd86d4 2208
48842b30
DG
2209 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2210 channel_name);
2211 if (uchan == NULL) {
2212 /* TODO: Create default channel */
2213 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2214 goto error;
2215 }
2bdd86d4 2216
48842b30
DG
2217 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2218 if (uevent == NULL) {
2219 uevent = trace_ust_create_event(event);
2220 if (uevent == NULL) {
2bdd86d4
MD
2221 ret = LTTCOMM_FATAL;
2222 goto error;
2223 }
48842b30 2224 }
2bdd86d4 2225
48842b30
DG
2226 ret = ust_app_add_event(usess, uchan, uevent);
2227 if (ret < 0) {
2228 ret = LTTCOMM_UST_ENABLE_FAIL;
2229 goto error;
2bdd86d4
MD
2230 }
2231 break;
2232 }
2233 case LTTNG_DOMAIN_UST_EXEC_NAME:
2234 case LTTNG_DOMAIN_UST_PID:
2235 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2236 default:
54d01ffb
DG
2237 ret = LTTCOMM_NOT_IMPLEMENTED;
2238 goto error;
950131af 2239 }
d36b8583 2240
54d01ffb 2241 ret = LTTCOMM_OK;
d36b8583 2242
54d01ffb
DG
2243error:
2244 return ret;
2245}
7d29a247 2246
54d01ffb
DG
2247/*
2248 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2249 */
2250static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2251 char *channel_name, int event_type)
54d01ffb
DG
2252{
2253 int ret;
2254 struct ltt_kernel_channel *kchan;
7d29a247 2255
54d01ffb
DG
2256 switch (domain) {
2257 case LTTNG_DOMAIN_KERNEL:
2258 kchan = trace_kernel_get_channel_by_name(channel_name,
2259 session->kernel_session);
2260 if (kchan == NULL) {
2261 /* This call will notify the kernel thread */
44d3bd01
DG
2262 ret = channel_kernel_create(session->kernel_session, NULL,
2263 kernel_poll_pipe[1]);
54d01ffb
DG
2264 if (ret != LTTCOMM_OK) {
2265 goto error;
d36b8583 2266 }
54d01ffb 2267 }
0d0c377a 2268
54d01ffb
DG
2269 /* Get the newly created kernel channel pointer */
2270 kchan = trace_kernel_get_channel_by_name(channel_name,
2271 session->kernel_session);
2272 if (kchan == NULL) {
2273 /* This sould not happen... */
2274 ret = LTTCOMM_FATAL;
2275 goto error;
2276 }
0fdd1e2c 2277
7a3d1328
MD
2278 switch (event_type) {
2279 case LTTNG_KERNEL_SYSCALL:
2280 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2281 kchan, kernel_tracer_fd);
7a3d1328
MD
2282 break;
2283 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2284 /*
7a3d1328
MD
2285 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2286 * events already registered to the channel.
8c9ae521 2287 */
7a3d1328
MD
2288 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2289 kchan, kernel_tracer_fd);
2290 break;
2291 case LTTNG_KERNEL_ALL:
2292 /* Enable syscalls and tracepoints */
8c9ae521
DG
2293 ret = event_kernel_enable_all(session->kernel_session,
2294 kchan, kernel_tracer_fd);
7a3d1328
MD
2295 break;
2296 default:
2297 ret = LTTCOMM_KERN_ENABLE_FAIL;
2298 goto error;
8c9ae521 2299 }
54d01ffb 2300 if (ret != LTTCOMM_OK) {
0d0c377a 2301 goto error;
d36b8583
DG
2302 }
2303
54d01ffb 2304 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2305 break;
54d01ffb
DG
2306 default:
2307 /* TODO: Userspace tracing */
2308 ret = LTTCOMM_NOT_IMPLEMENTED;
2309 goto error;
d36b8583 2310 }
f3ed775e 2311
54d01ffb
DG
2312 ret = LTTCOMM_OK;
2313
2314error:
2315 return ret;
2316}
2317
2318/*
2319 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2320 */
2321static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2322{
2323 int ret;
2324 ssize_t nb_events = 0;
2325
2326 switch (domain) {
2327 case LTTNG_DOMAIN_KERNEL:
2328 nb_events = kernel_list_events(kernel_tracer_fd, events);
2329 if (nb_events < 0) {
2330 ret = LTTCOMM_KERN_LIST_FAIL;
2331 goto error;
894be886 2332 }
54d01ffb
DG
2333 break;
2334 default:
2335 /* TODO: Userspace listing */
2336 ret = LTTCOMM_NOT_IMPLEMENTED;
2337 goto error;
2338 }
894be886 2339
54d01ffb 2340 return nb_events;
7d29a247 2341
54d01ffb
DG
2342error:
2343 /* Return negative value to differentiate return code */
2344 return -ret;
2345}
b389abbe 2346
54d01ffb
DG
2347/*
2348 * Command LTTNG_START_TRACE processed by the client thread.
2349 */
2350static int cmd_start_trace(struct ltt_session *session)
2351{
2352 int ret;
54d01ffb 2353 struct ltt_kernel_session *ksession;
48842b30 2354 struct ltt_ust_session *usess = session->ust_session;
b389abbe 2355
54d01ffb
DG
2356 /* Short cut */
2357 ksession = session->kernel_session;
5eb91c98 2358
54d01ffb
DG
2359 /* Kernel tracing */
2360 if (ksession != NULL) {
2bdd86d4
MD
2361 struct ltt_kernel_channel *kchan;
2362
54d01ffb
DG
2363 /* Open kernel metadata */
2364 if (ksession->metadata == NULL) {
2365 ret = kernel_open_metadata(ksession, ksession->trace_path);
2366 if (ret < 0) {
2367 ret = LTTCOMM_KERN_META_FAIL;
2368 goto error;
b389abbe 2369 }
54d01ffb 2370 }
7d29a247 2371
54d01ffb
DG
2372 /* Open kernel metadata stream */
2373 if (ksession->metadata_stream_fd == 0) {
2374 ret = kernel_open_metadata_stream(ksession);
2375 if (ret < 0) {
2376 ERR("Kernel create metadata stream failed");
2377 ret = LTTCOMM_KERN_STREAM_FAIL;
2378 goto error;
2379 }
2380 }
2381
2382 /* For each channel */
2383 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2384 if (kchan->stream_count == 0) {
2385 ret = kernel_open_channel_stream(kchan);
2386 if (ret < 0) {
2387 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2388 goto error;
2389 }
54d01ffb
DG
2390 /* Update the stream global counter */
2391 ksession->stream_count_global += ret;
7d29a247 2392 }
54d01ffb
DG
2393 }
2394
2395 /* Setup kernel consumer socket and send fds to it */
2396 ret = init_kernel_tracing(ksession);
2397 if (ret < 0) {
2398 ret = LTTCOMM_KERN_START_FAIL;
2399 goto error;
2400 }
2401
2402 /* This start the kernel tracing */
2403 ret = kernel_start_session(ksession);
2404 if (ret < 0) {
2405 ret = LTTCOMM_KERN_START_FAIL;
2406 goto error;
2407 }
2408
2409 /* Quiescent wait after starting trace */
2410 kernel_wait_quiescent(kernel_tracer_fd);
2411 }
2412
48842b30
DG
2413 ret = ust_app_start_trace(usess);
2414 if (ret < 0) {
2415 ret = LTTCOMM_UST_START_FAIL;
2416 goto error;
2bdd86d4 2417 }
54d01ffb
DG
2418
2419 ret = LTTCOMM_OK;
2420
2421error:
2422 return ret;
2423}
2424
2425/*
2426 * Command LTTNG_STOP_TRACE processed by the client thread.
2427 */
2428static int cmd_stop_trace(struct ltt_session *session)
2429{
2430 int ret;
2431 struct ltt_kernel_channel *kchan;
2432 struct ltt_kernel_session *ksession;
48842b30
DG
2433 //struct ltt_ust_session *usess;
2434 //struct ltt_ust_channel *ustchan;
54d01ffb
DG
2435
2436 /* Short cut */
2437 ksession = session->kernel_session;
2438
2439 /* Kernel tracer */
2440 if (ksession != NULL) {
2441 DBG("Stop kernel tracing");
2442
2443 /* Flush all buffers before stopping */
2444 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2445 if (ret < 0) {
2446 ERR("Kernel metadata flush failed");
2447 }
f34daff7 2448
54d01ffb
DG
2449 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2450 ret = kernel_flush_buffer(kchan);
0d0c377a 2451 if (ret < 0) {
54d01ffb 2452 ERR("Kernel flush buffer error");
7d29a247 2453 }
54d01ffb 2454 }
19e70852 2455
54d01ffb
DG
2456 ret = kernel_stop_session(ksession);
2457 if (ret < 0) {
2458 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2459 goto error;
f3ed775e 2460 }
54d01ffb
DG
2461
2462 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2463 }
54d01ffb 2464
48842b30 2465#ifdef DISABLE
2bdd86d4
MD
2466 /* Stop each UST session */
2467 DBG("Stop UST tracing");
48842b30 2468 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2bdd86d4 2469 /* Flush all buffers before stopping */
48842b30 2470 ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj);
2bdd86d4
MD
2471 if (ret < 0) {
2472 ERR("UST metadata flush failed");
2473 }
2474
48842b30
DG
2475 cds_list_for_each_entry(ustchan, &usess->channels.head, list) {
2476 ret = ustctl_flush_buffer(usess->sock, ustchan->obj);
2bdd86d4
MD
2477 if (ret < 0) {
2478 ERR("UST flush buffer error");
2479 }
2480 }
2481
48842b30 2482 ret = ustctl_stop_session(usess->sock, usess->handle);
2bdd86d4
MD
2483 if (ret < 0) {
2484 ret = LTTCOMM_KERN_STOP_FAIL;
2485 goto error;
2486 }
2487
48842b30 2488 ustctl_wait_quiescent(usess->sock);
2bdd86d4 2489 }
48842b30 2490#endif
54d01ffb
DG
2491
2492 ret = LTTCOMM_OK;
2493
2494error:
2495 return ret;
2496}
2497
2498/*
2499 * Command LTTNG_CREATE_SESSION processed by the client thread.
2500 */
2501static int cmd_create_session(char *name, char *path)
2502{
2503 int ret;
2504
2505 ret = session_create(name, path);
2506 if (ret != LTTCOMM_OK) {
2507 goto error;
2508 }
2509
2510 ret = LTTCOMM_OK;
2511
2512error:
2513 return ret;
2514}
2515
2516/*
2517 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2518 */
2519static int cmd_destroy_session(struct ltt_session *session, char *name)
2520{
2521 int ret;
2522
2523 /* Clean kernel session teardown */
2524 teardown_kernel_session(session);
2525
2526 /*
2527 * Must notify the kernel thread here to update it's poll setin order
2528 * to remove the channel(s)' fd just destroyed.
2529 */
2530 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2531 if (ret < 0) {
2532 perror("write kernel poll pipe");
2533 }
2534
271933a4 2535 ret = session_destroy(session);
54d01ffb
DG
2536
2537 return ret;
2538}
2539
2540/*
2541 * Command LTTNG_CALIBRATE processed by the client thread.
2542 */
2543static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2544{
2545 int ret;
2546
2547 switch (domain) {
2548 case LTTNG_DOMAIN_KERNEL:
33a2b854 2549 {
54d01ffb 2550 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2551
54d01ffb
DG
2552 kcalibrate.type = calibrate->type;
2553 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2554 if (ret < 0) {
54d01ffb
DG
2555 ret = LTTCOMM_KERN_ENABLE_FAIL;
2556 goto error;
33a2b854 2557 }
54d01ffb
DG
2558 break;
2559 }
2560 default:
2561 /* TODO: Userspace tracing */
2562 ret = LTTCOMM_NOT_IMPLEMENTED;
2563 goto error;
2564 }
33a2b854 2565
54d01ffb 2566 ret = LTTCOMM_OK;
33a2b854 2567
54d01ffb
DG
2568error:
2569 return ret;
2570}
7d29a247 2571
54d01ffb
DG
2572/*
2573 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2574 */
2575static int cmd_register_consumer(struct ltt_session *session, int domain,
2576 char *sock_path)
2577{
2578 int ret, sock;
b389abbe 2579
54d01ffb
DG
2580 switch (domain) {
2581 case LTTNG_DOMAIN_KERNEL:
2582 /* Can't register a consumer if there is already one */
2583 if (session->kernel_session->consumer_fd != 0) {
2584 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2585 goto error;
2586 }
2587
2588 sock = lttcomm_connect_unix_sock(sock_path);
2589 if (sock < 0) {
2590 ret = LTTCOMM_CONNECT_FAIL;
2591 goto error;
2592 }
2593
2594 session->kernel_session->consumer_fd = sock;
2595 break;
2596 default:
2597 /* TODO: Userspace tracing */
2598 ret = LTTCOMM_NOT_IMPLEMENTED;
2599 goto error;
2600 }
2601
2602 ret = LTTCOMM_OK;
2603
2604error:
2605 return ret;
2606}
2607
2608/*
2609 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2610 */
2611static ssize_t cmd_list_domains(struct ltt_session *session,
2612 struct lttng_domain **domains)
2613{
2614 int ret;
2615 ssize_t nb_dom = 0;
2616
2617 if (session->kernel_session != NULL) {
2618 nb_dom++;
2619 }
2620
f6a9efaa 2621 /* TODO: User-space tracer domain support */
54d01ffb
DG
2622
2623 *domains = malloc(nb_dom * sizeof(struct lttng_domain));
2624 if (*domains == NULL) {
2625 ret = -LTTCOMM_FATAL;
2626 goto error;
2627 }
2628
2629 (*domains)[0].type = LTTNG_DOMAIN_KERNEL;
2630
54d01ffb
DG
2631 return nb_dom;
2632
2633error:
2634 return ret;
2635}
2636
2637/*
2638 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2639 */
2640static ssize_t cmd_list_channels(struct ltt_session *session,
2641 struct lttng_channel **channels)
2642{
2643 int ret;
2644 ssize_t nb_chan = 0;
2645
2646 if (session->kernel_session != NULL) {
2647 nb_chan += session->kernel_session->channel_count;
2648 }
2649
2650 *channels = malloc(nb_chan * sizeof(struct lttng_channel));
2651 if (*channels == NULL) {
2652 ret = -LTTCOMM_FATAL;
2653 goto error;
2654 }
2655
2656 list_lttng_channels(session, *channels);
2657
2bdd86d4
MD
2658 /* TODO UST support */
2659
54d01ffb
DG
2660 return nb_chan;
2661
2662error:
2663 return ret;
2664}
2665
2666/*
2667 * Command LTTNG_LIST_EVENTS processed by the client thread.
2668 */
2669static ssize_t cmd_list_events(struct ltt_session *session,
2670 char *channel_name, struct lttng_event **events)
2671{
2672 int ret;
2673 ssize_t nb_event = 0;
2674 struct ltt_kernel_channel *kchan = NULL;
2675
2676 if (session->kernel_session != NULL) {
2677 kchan = trace_kernel_get_channel_by_name(channel_name,
2678 session->kernel_session);
2679 if (kchan == NULL) {
2680 ret = -LTTCOMM_KERN_CHAN_NOT_FOUND;
2681 goto error;
2682 }
2683 nb_event += kchan->event_count;
2684 }
2685
2686 *events = malloc(nb_event * sizeof(struct lttng_event));
2687 if (*events == NULL) {
2688 ret = -LTTCOMM_FATAL;
2689 goto error;
2690 }
2691
2692 list_lttng_events(kchan, *events);
2693
2694 /* TODO: User-space tracer support */
2695
2696 return nb_event;
2697
2698error:
2699 return ret;
2700}
2701
2702/*
2703 * Process the command requested by the lttng client within the command
2704 * context structure. This function make sure that the return structure (llm)
2705 * is set and ready for transmission before returning.
2706 *
2707 * Return any error encountered or 0 for success.
2708 */
2709static int process_client_msg(struct command_ctx *cmd_ctx)
2710{
2711 int ret = LTTCOMM_OK;
44d3bd01 2712 int need_tracing_session = 1;
54d01ffb
DG
2713
2714 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2715
2716 /*
2717 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2718 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2719 * command.
2720 */
2721 switch(cmd_ctx->lsm->cmd_type) {
2722 case LTTNG_LIST_SESSIONS:
2723 case LTTNG_LIST_TRACEPOINTS:
2724 case LTTNG_LIST_DOMAINS:
2725 case LTTNG_LIST_CHANNELS:
2726 case LTTNG_LIST_EVENTS:
2727 break;
2728 default:
2729 /* Setup lttng message with no payload */
2730 ret = setup_lttng_msg(cmd_ctx, 0);
2731 if (ret < 0) {
2732 /* This label does not try to unlock the session */
2733 goto init_setup_error;
2734 }
2735 }
2736
2737 /* Commands that DO NOT need a session. */
2738 switch (cmd_ctx->lsm->cmd_type) {
2739 case LTTNG_CALIBRATE:
2740 case LTTNG_CREATE_SESSION:
2741 case LTTNG_LIST_SESSIONS:
2742 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2743 need_tracing_session = 0;
54d01ffb
DG
2744 break;
2745 default:
2746 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 2747 session_lock_list();
54d01ffb 2748 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 2749 session_unlock_list();
54d01ffb
DG
2750 if (cmd_ctx->session == NULL) {
2751 if (cmd_ctx->lsm->session.name != NULL) {
2752 ret = LTTCOMM_SESS_NOT_FOUND;
2753 } else {
2754 /* If no session name specified */
2755 ret = LTTCOMM_SELECT_SESS;
2756 }
2757 goto error;
2758 } else {
2759 /* Acquire lock for the session */
2760 session_lock(cmd_ctx->session);
2761 }
2762 break;
2763 }
b389abbe 2764
54d01ffb
DG
2765 /*
2766 * Check domain type for specific "pre-action".
2767 */
2768 switch (cmd_ctx->lsm->domain.type) {
2769 case LTTNG_DOMAIN_KERNEL:
2770 /* Kernel tracer check */
2771 if (kernel_tracer_fd == 0) {
2772 /* Basically, load kernel tracer modules */
2773 init_kernel_tracer();
2774 if (kernel_tracer_fd == 0) {
2775 ret = LTTCOMM_KERN_NA;
2776 goto error;
2777 }
2778 }
5eb91c98 2779
54d01ffb 2780 /* Need a session for kernel command */
44d3bd01 2781 if (need_tracing_session) {
54d01ffb
DG
2782 if (cmd_ctx->session->kernel_session == NULL) {
2783 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2784 if (ret < 0) {
54d01ffb 2785 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2786 goto error;
2787 }
b389abbe 2788 }
7d29a247 2789
54d01ffb 2790 /* Start the kernel consumer daemon */
3bd1e081
MD
2791 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2792 if (kconsumer_data.pid == 0 &&
54d01ffb 2793 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
2794 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2795 ret = start_consumerd(&kconsumer_data);
7d29a247 2796 if (ret < 0) {
54d01ffb
DG
2797 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2798 goto error;
950131af 2799 }
33a2b854 2800 }
3bd1e081 2801 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
0d0c377a 2802 }
54d01ffb 2803 break;
2bdd86d4 2804 case LTTNG_DOMAIN_UST:
44d3bd01 2805 {
44d3bd01 2806 if (need_tracing_session) {
f6a9efaa 2807 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
2808 ret = create_ust_session(cmd_ctx->session,
2809 &cmd_ctx->lsm->domain);
2810 if (ret != LTTCOMM_OK) {
2811 goto error;
2812 }
2813 }
2bdd86d4
MD
2814 /* Start the kernel consumer daemon */
2815 pthread_mutex_lock(&ustconsumer_data.pid_mutex);
2816 if (ustconsumer_data.pid == 0 &&
2817 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2818 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
2819 ret = start_consumerd(&ustconsumer_data);
2820 if (ret < 0) {
2821 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2822 goto error;
2823 }
48842b30
DG
2824
2825 cmd_ctx->session->ust_session->consumer_fd =
2826 ustconsumer_data.cmd_sock;
2bdd86d4
MD
2827 }
2828 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
44d3bd01
DG
2829 }
2830 break;
48842b30 2831 }
54d01ffb 2832 default:
54d01ffb
DG
2833 break;
2834 }
33a2b854 2835
54d01ffb
DG
2836 /* Process by command type */
2837 switch (cmd_ctx->lsm->cmd_type) {
2838 case LTTNG_ADD_CONTEXT:
2839 {
2840 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2841 cmd_ctx->lsm->u.context.channel_name,
2842 cmd_ctx->lsm->u.context.event_name,
2843 &cmd_ctx->lsm->u.context.ctx);
2844 break;
2845 }
2846 case LTTNG_DISABLE_CHANNEL:
2847 {
2848 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2849 cmd_ctx->lsm->u.disable.channel_name);
2850 break;
2851 }
2852 case LTTNG_DISABLE_EVENT:
2853 {
2854 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2855 cmd_ctx->lsm->u.disable.channel_name,
2856 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2857 ret = LTTCOMM_OK;
2858 break;
2859 }
54d01ffb
DG
2860 case LTTNG_DISABLE_ALL_EVENT:
2861 {
2bdd86d4 2862 DBG("Disabling all events");
54d01ffb
DG
2863
2864 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2865 cmd_ctx->lsm->u.disable.channel_name);
2866 break;
2867 }
2868 case LTTNG_ENABLE_CHANNEL:
2869 {
44d3bd01 2870 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG
2871 &cmd_ctx->lsm->u.channel.chan);
2872 break;
2873 }
2874 case LTTNG_ENABLE_EVENT:
2875 {
2876 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2877 cmd_ctx->lsm->u.enable.channel_name,
2878 &cmd_ctx->lsm->u.enable.event);
2879 break;
2880 }
2881 case LTTNG_ENABLE_ALL_EVENT:
2882 {
2bdd86d4 2883 DBG("Enabling all events");
54d01ffb
DG
2884
2885 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
2886 cmd_ctx->lsm->u.enable.channel_name,
2887 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
2888 break;
2889 }
052da939 2890 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2891 {
9f19cc17 2892 struct lttng_event *events;
54d01ffb 2893 ssize_t nb_events;
052da939 2894
54d01ffb
DG
2895 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2896 if (nb_events < 0) {
2897 ret = -nb_events;
2898 goto error;
2ef84c95
DG
2899 }
2900
2901 /*
2902 * Setup lttng message with payload size set to the event list size in
2903 * bytes and then copy list into the llm payload.
2904 */
052da939 2905 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2906 if (ret < 0) {
052da939 2907 free(events);
2ef84c95
DG
2908 goto setup_error;
2909 }
2910
2911 /* Copy event list into message payload */
9f19cc17 2912 memcpy(cmd_ctx->llm->payload, events,
052da939 2913 sizeof(struct lttng_event) * nb_events);
2ef84c95 2914
9f19cc17 2915 free(events);
2ef84c95
DG
2916
2917 ret = LTTCOMM_OK;
2918 break;
2919 }
f3ed775e 2920 case LTTNG_START_TRACE:
8c0faa1d 2921 {
54d01ffb 2922 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2923 break;
2924 }
f3ed775e 2925 case LTTNG_STOP_TRACE:
8c0faa1d 2926 {
54d01ffb 2927 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2928 break;
2929 }
5e16da05
MD
2930 case LTTNG_CREATE_SESSION:
2931 {
54d01ffb
DG
2932 ret = cmd_create_session(cmd_ctx->lsm->session.name,
2933 cmd_ctx->lsm->session.path);
5e16da05
MD
2934 break;
2935 }
2936 case LTTNG_DESTROY_SESSION:
2937 {
54d01ffb
DG
2938 ret = cmd_destroy_session(cmd_ctx->session,
2939 cmd_ctx->lsm->session.name);
5461b305 2940 break;
5e16da05 2941 }
9f19cc17 2942 case LTTNG_LIST_DOMAINS:
5e16da05 2943 {
54d01ffb
DG
2944 ssize_t nb_dom;
2945 struct lttng_domain *domains;
5461b305 2946
54d01ffb
DG
2947 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2948 if (nb_dom < 0) {
2949 ret = -nb_dom;
2950 goto error;
ce3d728c 2951 }
520ff687 2952
54d01ffb 2953 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
2954 if (ret < 0) {
2955 goto setup_error;
520ff687 2956 }
57167058 2957
54d01ffb
DG
2958 /* Copy event list into message payload */
2959 memcpy(cmd_ctx->llm->payload, domains,
2960 nb_dom * sizeof(struct lttng_domain));
2961
2962 free(domains);
5e16da05 2963
5461b305 2964 ret = LTTCOMM_OK;
5e16da05
MD
2965 break;
2966 }
9f19cc17 2967 case LTTNG_LIST_CHANNELS:
5e16da05 2968 {
54d01ffb
DG
2969 size_t nb_chan;
2970 struct lttng_channel *channels;
2971
2972 nb_chan = cmd_list_channels(cmd_ctx->session, &channels);
2973 if (nb_chan < 0) {
2974 ret = -nb_chan;
2975 goto error;
5461b305 2976 }
ca95a216 2977
54d01ffb 2978 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
2979 if (ret < 0) {
2980 goto setup_error;
2981 }
9f19cc17 2982
54d01ffb
DG
2983 /* Copy event list into message payload */
2984 memcpy(cmd_ctx->llm->payload, channels,
2985 nb_chan * sizeof(struct lttng_channel));
2986
2987 free(channels);
9f19cc17
DG
2988
2989 ret = LTTCOMM_OK;
5461b305 2990 break;
5e16da05 2991 }
9f19cc17 2992 case LTTNG_LIST_EVENTS:
5e16da05 2993 {
54d01ffb 2994 size_t nb_event;
684d34d2 2995 struct lttng_event *events = NULL;
9f19cc17 2996
54d01ffb
DG
2997 nb_event = cmd_list_events(cmd_ctx->session,
2998 cmd_ctx->lsm->u.list.channel_name, &events);
2999 if (nb_event < 0) {
3000 ret = -nb_event;
3001 goto error;
5461b305 3002 }
ca95a216 3003
54d01ffb 3004 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
3005 if (ret < 0) {
3006 goto setup_error;
3007 }
9f19cc17 3008
54d01ffb
DG
3009 /* Copy event list into message payload */
3010 memcpy(cmd_ctx->llm->payload, events,
3011 nb_event * sizeof(struct lttng_event));
9f19cc17 3012
54d01ffb 3013 free(events);
9f19cc17
DG
3014
3015 ret = LTTCOMM_OK;
5461b305 3016 break;
5e16da05
MD
3017 }
3018 case LTTNG_LIST_SESSIONS:
3019 {
54d01ffb 3020 session_lock_list();
5461b305 3021
6c9cc2ab 3022 if (session_list_ptr->count == 0) {
f3ed775e 3023 ret = LTTCOMM_NO_SESSION;
54d01ffb 3024 session_unlock_list();
5461b305 3025 goto error;
57167058 3026 }
5e16da05 3027
6c9cc2ab
DG
3028 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3029 session_list_ptr->count);
5461b305 3030 if (ret < 0) {
54d01ffb 3031 session_unlock_list();
5461b305 3032 goto setup_error;
e065084a 3033 }
5e16da05 3034
6c9cc2ab
DG
3035 /* Filled the session array */
3036 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3037
54d01ffb 3038 session_unlock_list();
5e16da05 3039
5461b305 3040 ret = LTTCOMM_OK;
5e16da05
MD
3041 break;
3042 }
d0254c7c
MD
3043 case LTTNG_CALIBRATE:
3044 {
54d01ffb
DG
3045 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3046 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
3047 break;
3048 }
d9800920
DG
3049 case LTTNG_REGISTER_CONSUMER:
3050 {
54d01ffb
DG
3051 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3052 cmd_ctx->lsm->u.reg.path);
d9800920
DG
3053 break;
3054 }
5e16da05 3055 default:
5e16da05 3056 ret = LTTCOMM_UND;
5461b305 3057 break;
fac6795d
DG
3058 }
3059
5461b305 3060error:
5461b305
DG
3061 if (cmd_ctx->llm == NULL) {
3062 DBG("Missing llm structure. Allocating one.");
894be886 3063 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
3064 goto setup_error;
3065 }
3066 }
54d01ffb 3067 /* Set return code */
5461b305 3068 cmd_ctx->llm->ret_code = ret;
5461b305 3069setup_error:
b5541356 3070 if (cmd_ctx->session) {
54d01ffb 3071 session_unlock(cmd_ctx->session);
b5541356 3072 }
54d01ffb 3073init_setup_error:
8028d920 3074 return ret;
fac6795d
DG
3075}
3076
1d4b027a 3077/*
d063d709
DG
3078 * This thread manage all clients request using the unix client socket for
3079 * communication.
1d4b027a
DG
3080 */
3081static void *thread_manage_clients(void *data)
3082{
5eb91c98
DG
3083 int sock = 0, ret, i, pollfd;
3084 uint32_t revents, nb_fd;
273ea72c 3085 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3086 struct lttng_poll_event events;
1d4b027a
DG
3087
3088 DBG("[thread] Manage client started");
3089
f6a9efaa
DG
3090 rcu_register_thread();
3091
1d4b027a
DG
3092 ret = lttcomm_listen_unix_sock(client_sock);
3093 if (ret < 0) {
3094 goto error;
3095 }
3096
5eb91c98
DG
3097 /*
3098 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3099 * more will be added to this poll set.
3100 */
3101 ret = create_thread_poll_set(&events, 2);
3102 if (ret < 0) {
3103 goto error;
3104 }
273ea72c 3105
5eb91c98
DG
3106 /* Add the application registration socket */
3107 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3108 if (ret < 0) {
3109 goto error;
3110 }
273ea72c 3111
bbd973c2
DG
3112 /*
3113 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
3114 */
3115 if (opt_sig_parent) {
3116 kill(ppid, SIGCHLD);
3117 }
3118
3119 while (1) {
1d4b027a 3120 DBG("Accepting client command ...");
273ea72c 3121
5eb91c98
DG
3122 nb_fd = LTTNG_POLL_GETNB(&events);
3123
273ea72c 3124 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3125 ret = lttng_poll_wait(&events, -1);
273ea72c 3126 if (ret < 0) {
273ea72c
DG
3127 goto error;
3128 }
3129
5eb91c98
DG
3130 for (i = 0; i < nb_fd; i++) {
3131 /* Fetch once the poll data */
3132 revents = LTTNG_POLL_GETEV(&events, i);
3133 pollfd = LTTNG_POLL_GETFD(&events, i);
3134
3135 /* Thread quit pipe has been closed. Killing thread. */
3136 ret = check_thread_quit_pipe(pollfd, revents);
3137 if (ret) {
3138 goto error;
3139 }
3140
3141 /* Event on the registration socket */
3142 if (pollfd == client_sock) {
3143 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3144 ERR("Client socket poll error");
3145 goto error;
3146 }
3147 }
3148 }
3149
3150 DBG("Wait for client response");
3151
3152 sock = lttcomm_accept_unix_sock(client_sock);
3153 if (sock < 0) {
273ea72c 3154 goto error;
273ea72c
DG
3155 }
3156
5eb91c98
DG
3157 /* Allocate context command to process the client request */
3158 cmd_ctx = malloc(sizeof(struct command_ctx));
3159 if (cmd_ctx == NULL) {
3160 perror("malloc cmd_ctx");
1d4b027a 3161 goto error;
5eb91c98 3162 }
1d4b027a 3163
5eb91c98
DG
3164 /* Allocate data buffer for reception */
3165 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
3166 if (cmd_ctx->lsm == NULL) {
3167 perror("malloc cmd_ctx->lsm");
3168 goto error;
3169 }
1d4b027a 3170
5eb91c98
DG
3171 cmd_ctx->llm = NULL;
3172 cmd_ctx->session = NULL;
1d4b027a 3173
5eb91c98
DG
3174 /*
3175 * Data is received from the lttng client. The struct
3176 * lttcomm_session_msg (lsm) contains the command and data request of
3177 * the client.
3178 */
3179 DBG("Receiving data from client ...");
3180 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3181 sizeof(struct lttcomm_session_msg));
3182 if (ret <= 0) {
3183 DBG("Nothing recv() from client... continuing");
3184 close(sock);
3185 free(cmd_ctx);
3186 continue;
3187 }
1d4b027a 3188
5eb91c98
DG
3189 // TODO: Validate cmd_ctx including sanity check for
3190 // security purpose.
f7776ea7 3191
f6a9efaa 3192 rcu_thread_online();
5eb91c98
DG
3193 /*
3194 * This function dispatch the work to the kernel or userspace tracer
3195 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3196 * informations for the client. The command context struct contains
3197 * everything this function may needs.
3198 */
3199 ret = process_client_msg(cmd_ctx);
f6a9efaa 3200 rcu_thread_offline();
5eb91c98 3201 if (ret < 0) {
bbd973c2 3202 /*
5eb91c98
DG
3203 * TODO: Inform client somehow of the fatal error. At
3204 * this point, ret < 0 means that a malloc failed
3205 * (ENOMEM). Error detected but still accept command.
bbd973c2 3206 */
bbd973c2 3207 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
3208 continue;
3209 }
d6e4fca4 3210
54d01ffb
DG
3211 DBG("Sending response (size: %d, retcode: %s)",
3212 cmd_ctx->lttng_msg_size,
9a745bc7 3213 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3214 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
3215 if (ret < 0) {
3216 ERR("Failed to send data back to client");
bbd973c2 3217 }
1d4b027a 3218
5eb91c98
DG
3219 clean_command_ctx(&cmd_ctx);
3220
3221 /* End of transmission */
273ea72c
DG
3222 close(sock);
3223 }
3224
5eb91c98
DG
3225error:
3226 DBG("Client thread dying");
273ea72c 3227 unlink(client_unix_sock_path);
5eb91c98
DG
3228 close(client_sock);
3229 close(sock);
273ea72c 3230
5eb91c98 3231 lttng_poll_clean(&events);
a2fb29a5 3232 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG
3233
3234 rcu_unregister_thread();
1d4b027a
DG
3235 return NULL;
3236}
3237
3238
fac6795d
DG
3239/*
3240 * usage function on stderr
3241 */
3242static void usage(void)
3243{
b716ce68 3244 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
3245 fprintf(stderr, " -h, --help Display this usage.\n");
3246 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3247 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3248 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3249 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3bd1e081
MD
3250 fprintf(stderr, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3251 fprintf(stderr, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
d6f42150
DG
3252 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3253 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3254 fprintf(stderr, " -V, --version Show version number.\n");
3255 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3256 fprintf(stderr, " -q, --quiet No output at all.\n");
3257 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3258 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
fac6795d
DG
3259}
3260
3261/*
3262 * daemon argument parsing
3263 */
3264static int parse_args(int argc, char **argv)
3265{
3266 int c;
3267
3268 static struct option long_options[] = {
3269 { "client-sock", 1, 0, 'c' },
3270 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD
3271 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3272 { "kconsumerd-err-sock", 1, 0, 'E' },
3273 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3274 { "ustconsumerd-err-sock", 1, 0, 'F' },
fac6795d 3275 { "daemonize", 0, 0, 'd' },
5b8719f5 3276 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
3277 { "help", 0, 0, 'h' },
3278 { "group", 1, 0, 'g' },
3279 { "version", 0, 0, 'V' },
75462a81 3280 { "quiet", 0, 0, 'q' },
3f9947db 3281 { "verbose", 0, 0, 'v' },
3bd1e081 3282 { "verbose-consumer", 0, 0, 'Z' },
fac6795d
DG
3283 { NULL, 0, 0, 0 }
3284 };
3285
3286 while (1) {
3287 int option_index = 0;
3bd1e081 3288 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
54d01ffb 3289 long_options, &option_index);
fac6795d
DG
3290 if (c == -1) {
3291 break;
3292 }
3293
3294 switch (c) {
3295 case 0:
3296 fprintf(stderr, "option %s", long_options[option_index].name);
3297 if (optarg) {
3298 fprintf(stderr, " with arg %s\n", optarg);
3299 }
3300 break;
b716ce68 3301 case 'c':
fac6795d
DG
3302 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3303 break;
3304 case 'a':
3305 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3306 break;
3307 case 'd':
3308 opt_daemon = 1;
3309 break;
3310 case 'g':
3311 opt_tracing_group = strdup(optarg);
3312 break;
3313 case 'h':
3314 usage();
3315 exit(EXIT_FAILURE);
3316 case 'V':
3317 fprintf(stdout, "%s\n", VERSION);
3318 exit(EXIT_SUCCESS);
5b8719f5
DG
3319 case 'S':
3320 opt_sig_parent = 1;
3321 break;
d6f42150 3322 case 'E':
3bd1e081 3323 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG
3324 break;
3325 case 'C':
3bd1e081
MD
3326 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3327 break;
3328 case 'F':
3329 snprintf(ustconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3330 break;
3331 case 'D':
3332 snprintf(ustconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3333 break;
75462a81
DG
3334 case 'q':
3335 opt_quiet = 1;
3336 break;
3f9947db 3337 case 'v':
53086306
DG
3338 /* Verbose level can increase using multiple -v */
3339 opt_verbose += 1;
3f9947db 3340 break;
31f73cc9 3341 case 'Z':
3bd1e081 3342 opt_verbose_consumer += 1;
31f73cc9 3343 break;
fac6795d
DG
3344 default: