Simply close socket when application registration is refused
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG
36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
20fe2104 53#include "kernel-ctl.h"
32258573 54#include "lttng-sessiond.h"
0fdd1e2c 55#include "shm.h"
56fff090 56#include "ust-app.h"
1e307fab 57#include "ust-ctl.h"
8e68d1c8 58#include "utils.h"
fac6795d 59
3bd1e081
MD
60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 80const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG
89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d
DG
92static int opt_daemon;
93static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 94static pid_t ppid; /* Parent PID for --sig-parent option */
3bd1e081
MD
95
96/* Consumer daemon specific control data */
97static struct consumer_data kconsumer_data = {
98 .type = LTTNG_CONSUMER_KERNEL,
99};
100static struct consumer_data ustconsumer_data = {
101 .type = LTTNG_CONSUMER_UST,
102};
103
099e26bd 104static int dispatch_thread_exit;
fac6795d 105
54d01ffb
DG
106/* Global application Unix socket path */
107static char apps_unix_sock_path[PATH_MAX];
108/* Global client Unix socket path */
109static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
110/* global wait shm path for UST */
111static char wait_shm_path[PATH_MAX];
fac6795d 112
1d4b027a 113/* Sockets and FDs */
d6f42150
DG
114static int client_sock;
115static int apps_sock;
20fe2104 116static int kernel_tracer_fd;
7a485870 117static int kernel_poll_pipe[2];
1d4b027a 118
273ea72c
DG
119/*
120 * Quit pipe for all threads. This permits a single cancellation point
121 * for all threads when receiving an event on the pipe.
122 */
123static int thread_quit_pipe[2];
124
099e26bd
DG
125/*
126 * This pipe is used to inform the thread managing application communication
127 * that a command is queued and ready to be processed.
128 */
129static int apps_cmd_pipe[2];
130
1d4b027a 131/* Pthread, Mutexes and Semaphores */
1d4b027a 132static pthread_t apps_thread;
099e26bd 133static pthread_t reg_apps_thread;
1d4b027a 134static pthread_t client_thread;
7a485870 135static pthread_t kernel_thread;
099e26bd 136static pthread_t dispatch_thread;
5eb91c98 137
fac6795d 138
099e26bd
DG
139/*
140 * UST registration command queue. This queue is tied with a futex and uses a N
141 * wakers / 1 waiter implemented and detailed in futex.c/.h
142 *
143 * The thread_manage_apps and thread_dispatch_ust_registration interact with
144 * this queue and the wait/wake scheme.
145 */
146static struct ust_cmd_queue ust_cmd_queue;
147
b5541356
DG
148/*
149 * Pointer initialized before thread creation.
150 *
151 * This points to the tracing session list containing the session count and a
152 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
153 * MUST NOT be taken if you call a public function in session.c.
04ea676f 154 *
d063d709 155 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 156 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
157 */
158static struct ltt_session_list *session_list_ptr;
159
ba5d816e
MD
160int ust_consumer_fd;
161
5eb91c98
DG
162/*
163 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
164 */
165static int create_thread_poll_set(struct lttng_poll_event *events,
166 unsigned int size)
167{
168 int ret;
169
170 if (events == NULL || size == 0) {
171 ret = -1;
172 goto error;
173 }
174
175 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
176 if (ret < 0) {
177 goto error;
178 }
179
180 /* Add quit pipe */
181 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
182 if (ret < 0) {
183 goto error;
184 }
185
186 return 0;
187
188error:
189 return ret;
190}
191
192/*
193 * Check if the thread quit pipe was triggered.
194 *
195 * Return 1 if it was triggered else 0;
196 */
197static int check_thread_quit_pipe(int fd, uint32_t events)
198{
199 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
200 return 1;
201 }
202
203 return 0;
204}
205
0fdd1e2c
DG
206/*
207 * Remove modules in reverse load order.
208 */
209static int modprobe_remove_kernel_modules(void)
210{
211 int ret = 0, i;
212 char modprobe[256];
213
214 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
215 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 216 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG
217 kernel_modules_list[i].name);
218 if (ret < 0) {
24b487b8 219 perror("snprintf modprobe -r");
0fdd1e2c
DG
220 goto error;
221 }
222 modprobe[sizeof(modprobe) - 1] = '\0';
223 ret = system(modprobe);
224 if (ret == -1) {
24b487b8 225 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG
226 kernel_modules_list[i].name);
227 } else if (kernel_modules_list[i].required
228 && WEXITSTATUS(ret) != 0) {
229 ERR("Unable to remove module %s",
230 kernel_modules_list[i].name);
231 } else {
232 DBG("Modprobe removal successful %s",
233 kernel_modules_list[i].name);
234 }
235 }
236
237error:
238 return ret;
239}
240
241/*
242 * Return group ID of the tracing group or -1 if not found.
243 */
996b65c8
MD
244static gid_t allowed_group(void)
245{
246 struct group *grp;
247
274e143b
MD
248 if (opt_tracing_group) {
249 grp = getgrnam(opt_tracing_group);
250 } else {
251 grp = getgrnam(default_tracing_group);
252 }
996b65c8
MD
253 if (!grp) {
254 return -1;
255 } else {
256 return grp->gr_gid;
257 }
258}
259
273ea72c 260/*
5eb91c98 261 * Init thread quit pipe.
273ea72c
DG
262 *
263 * Return -1 on error or 0 if all pipes are created.
264 */
265static int init_thread_quit_pipe(void)
266{
267 int ret;
268
269 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
270 if (ret < 0) {
271 perror("thread quit pipe");
272 goto error;
273 }
274
275error:
276 return ret;
277}
278
fac6795d 279/*
d063d709
DG
280 * Complete teardown of a kernel session. This free all data structure related
281 * to a kernel session and update counter.
fac6795d 282 */
1d4b027a 283static void teardown_kernel_session(struct ltt_session *session)
fac6795d 284{
1d4b027a
DG
285 if (session->kernel_session != NULL) {
286 DBG("Tearing down kernel session");
d9800920
DG
287
288 /*
289 * If a custom kernel consumer was registered, close the socket before
290 * tearing down the complete kernel session structure
291 */
3bd1e081 292 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
d9800920
DG
293 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
294 }
295
62499ad6 296 trace_kernel_destroy_session(session->kernel_session);
1d4b027a
DG
297 /* Extra precaution */
298 session->kernel_session = NULL;
fac6795d 299 }
fac6795d
DG
300}
301
f6a9efaa
DG
302/*
303 * Complete teardown of all UST sessions. This will free everything on his path
304 * and destroy the core essence of all ust sessions :)
305 */
306static void teardown_ust_session(struct ltt_session *session)
307{
84cd17c6
MD
308 int ret;
309
f6a9efaa
DG
310 DBG("Tearing down UST session(s)");
311
84cd17c6
MD
312 ret = ust_app_destroy_trace_all(session->ust_session);
313 if (ret) {
314 ERR("Error in ust_app_destroy_trace_all");
315 }
f6a9efaa
DG
316 trace_ust_destroy_session(session->ust_session);
317}
318
099e26bd
DG
319/*
320 * Stop all threads by closing the thread quit pipe.
321 */
cf3af59e
MD
322static void stop_threads(void)
323{
5eb91c98
DG
324 int ret;
325
cf3af59e
MD
326 /* Stopping all threads */
327 DBG("Terminating all threads");
54d01ffb 328 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
329 if (ret < 0) {
330 ERR("write error on thread quit pipe");
331 }
332
099e26bd
DG
333 /* Dispatch thread */
334 dispatch_thread_exit = 1;
335 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
336}
337
fac6795d 338/*
d063d709 339 * Cleanup the daemon
fac6795d 340 */
cf3af59e 341static void cleanup(void)
fac6795d 342{
1d4b027a
DG
343 int ret;
344 char *cmd;
af9737e9 345 struct ltt_session *sess, *stmp;
fac6795d 346
1d4b027a 347 DBG("Cleaning up");
e07ae692 348
5eb91c98
DG
349 if (is_root) {
350 DBG("Removing %s directory", LTTNG_RUNDIR);
351 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
352 if (ret < 0) {
353 ERR("asprintf failed. Something is really wrong!");
354 }
5461b305 355
5eb91c98
DG
356 /* Remove lttng run directory */
357 ret = system(cmd);
358 if (ret < 0) {
359 ERR("Unable to clean " LTTNG_RUNDIR);
360 }
1d4b027a 361 }
5461b305 362
1d4b027a 363 DBG("Cleaning up all session");
fac6795d 364
b5541356 365 /* Destroy session list mutex */
273ea72c
DG
366 if (session_list_ptr != NULL) {
367 pthread_mutex_destroy(&session_list_ptr->lock);
368
369 /* Cleanup ALL session */
54d01ffb
DG
370 cds_list_for_each_entry_safe(sess, stmp,
371 &session_list_ptr->head, list) {
273ea72c 372 teardown_kernel_session(sess);
f6a9efaa
DG
373 teardown_ust_session(sess);
374 free(sess);
273ea72c
DG
375 }
376 }
377
099e26bd 378 DBG("Closing all UST sockets");
56fff090 379 ust_app_clean_list();
099e26bd 380
3bd1e081 381 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 382
f3ed775e 383 DBG("Closing kernel fd");
1d4b027a 384 close(kernel_tracer_fd);
ab147185 385
2f50c8a3
DG
386 if (is_root) {
387 DBG("Unloading kernel modules");
388 modprobe_remove_kernel_modules();
389 }
5eb91c98
DG
390
391 close(thread_quit_pipe[0]);
392 close(thread_quit_pipe[1]);
421cb601
DG
393
394 /* <fun> */
395 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
396 "Matthew, BEET driven development works!%c[%dm",
397 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
398 /* </fun> */
fac6795d
DG
399}
400
e065084a 401/*
d063d709 402 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 403 *
d063d709 404 * Return lttcomm error code.
e065084a
DG
405 */
406static int send_unix_sock(int sock, void *buf, size_t len)
407{
408 /* Check valid length */
409 if (len <= 0) {
410 return -1;
411 }
412
413 return lttcomm_send_unix_sock(sock, buf, len);
414}
415
5461b305 416/*
d063d709 417 * Free memory of a command context structure.
5461b305 418 */
a2fb29a5 419static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 420{
a2fb29a5
DG
421 DBG("Clean command context structure");
422 if (*cmd_ctx) {
423 if ((*cmd_ctx)->llm) {
424 free((*cmd_ctx)->llm);
5461b305 425 }
a2fb29a5
DG
426 if ((*cmd_ctx)->lsm) {
427 free((*cmd_ctx)->lsm);
5461b305 428 }
a2fb29a5
DG
429 free(*cmd_ctx);
430 *cmd_ctx = NULL;
5461b305
DG
431 }
432}
433
f3ed775e 434/*
d063d709 435 * Send all stream fds of kernel channel to the consumer.
f3ed775e 436 */
2bdd86d4 437static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 438 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG
439{
440 int ret;
f3ed775e 441 struct ltt_kernel_stream *stream;
3bd1e081 442 struct lttcomm_consumer_msg lkm;
f3ed775e 443
3bd1e081 444 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 445 channel->channel->name);
f3ed775e 446
3bd1e081
MD
447 /* Send channel */
448 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
449 lkm.u.channel.channel_key = channel->fd;
450 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
451 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 452 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 453 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 454 if (ret < 0) {
3bd1e081 455 perror("send consumer channel");
f3ed775e
DG
456 goto error;
457 }
458
3bd1e081 459 /* Send streams */
7a485870 460 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
461 if (!stream->fd) {
462 continue;
463 }
464 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
465 lkm.u.stream.channel_key = channel->fd;
466 lkm.u.stream.stream_key = stream->fd;
467 lkm.u.stream.state = stream->state;
468 lkm.u.stream.output = channel->channel->attr.output;
469 lkm.u.stream.mmap_len = 0; /* for kernel */
470 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
471 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
472 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
473 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
474 if (ret < 0) {
475 perror("send consumer stream");
476 goto error;
477 }
478 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
479 if (ret < 0) {
480 perror("send consumer stream ancillary data");
481 goto error;
f3ed775e
DG
482 }
483 }
484
3bd1e081 485 DBG("consumer channel streams sent");
f3ed775e
DG
486
487 return 0;
488
489error:
490 return ret;
491}
492
493/*
d063d709 494 * Send all stream fds of the kernel session to the consumer.
f3ed775e 495 */
2bdd86d4 496static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 497 struct ltt_kernel_session *session)
f3ed775e
DG
498{
499 int ret;
500 struct ltt_kernel_channel *chan;
3bd1e081
MD
501 struct lttcomm_consumer_msg lkm;
502 int sock = session->consumer_fd;
7a485870
DG
503
504 DBG("Sending metadata stream fd");
505
2bdd86d4 506 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 507 if (session->consumer_fd == 0) {
3bd1e081 508 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
509 }
510
7a485870 511 if (session->metadata_stream_fd != 0) {
3bd1e081
MD
512 /* Send metadata channel fd */
513 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
514 lkm.u.channel.channel_key = session->metadata->fd;
515 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
516 lkm.u.channel.mmap_len = 0; /* for kernel */
517 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
518 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
519 if (ret < 0) {
520 perror("send consumer channel");
521 goto error;
522 }
523
524 /* Send metadata stream fd */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
526 lkm.u.stream.channel_key = session->metadata->fd;
527 lkm.u.stream.stream_key = session->metadata_stream_fd;
528 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
529 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
530 lkm.u.stream.mmap_len = 0; /* for kernel */
531 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
532 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
533 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
534 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
535 if (ret < 0) {
536 perror("send consumer stream");
537 goto error;
538 }
539 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 540 if (ret < 0) {
3bd1e081 541 perror("send consumer stream");
7a485870
DG
542 goto error;
543 }
544 }
f3ed775e 545
f3ed775e 546 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD
547 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
548 if (ret < 0) {
549 goto error;
550 }
551 }
552
553 DBG("consumer fds (metadata and channel streams) sent");
554
555 return 0;
556
557error:
558 return ret;
559}
560
fac6795d 561/*
0fdd1e2c 562 * Notify UST applications using the shm mmap futex.
fac6795d 563 */
0fdd1e2c 564static int notify_ust_apps(int active)
fac6795d 565{
0fdd1e2c 566 char *wait_shm_mmap;
fac6795d 567
0fdd1e2c 568 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 569
0fdd1e2c
DG
570 /* See shm.c for this call implying mmap, shm and futex calls */
571 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
572 if (wait_shm_mmap == NULL) {
fac6795d
DG
573 goto error;
574 }
575
0fdd1e2c
DG
576 /* Wake waiting process */
577 futex_wait_update((int32_t *) wait_shm_mmap, active);
578
579 /* Apps notified successfully */
580 return 0;
fac6795d
DG
581
582error:
0fdd1e2c 583 return -1;
fac6795d
DG
584}
585
e065084a 586/*
d063d709
DG
587 * Setup the outgoing data buffer for the response (llm) by allocating the
588 * right amount of memory and copying the original information from the lsm
589 * structure.
ca95a216 590 *
d063d709 591 * Return total size of the buffer pointed by buf.
ca95a216 592 */
5461b305 593static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 594{
f3ed775e 595 int ret, buf_size;
ca95a216 596
f3ed775e 597 buf_size = size;
5461b305 598
ba7f0ae5 599 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 600 if (cmd_ctx->llm == NULL) {
ba7f0ae5 601 perror("zmalloc");
5461b305 602 ret = -ENOMEM;
ca95a216
DG
603 goto error;
604 }
605
5461b305
DG
606 /* Copy common data */
607 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 608 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 609
5461b305
DG
610 cmd_ctx->llm->data_size = size;
611 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
612
ca95a216
DG
613 return buf_size;
614
615error:
616 return ret;
617}
618
7a485870 619/*
5eb91c98 620 * Update the kernel poll set of all channel fd available over all tracing
d063d709 621 * session. Add the wakeup pipe at the end of the set.
7a485870 622 */
5eb91c98 623static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 624{
5eb91c98 625 int ret;
7a485870
DG
626 struct ltt_session *session;
627 struct ltt_kernel_channel *channel;
628
5eb91c98 629 DBG("Updating kernel poll set");
7a485870 630
54d01ffb 631 session_lock_list();
b5541356 632 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 633 session_lock(session);
7a485870 634 if (session->kernel_session == NULL) {
54d01ffb 635 session_unlock(session);
7a485870
DG
636 continue;
637 }
7a485870 638
54d01ffb
DG
639 cds_list_for_each_entry(channel,
640 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
641 /* Add channel fd to the kernel poll set */
642 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
643 if (ret < 0) {
54d01ffb 644 session_unlock(session);
5eb91c98
DG
645 goto error;
646 }
647 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 648 }
54d01ffb 649 session_unlock(session);
7a485870 650 }
54d01ffb 651 session_unlock_list();
7a485870 652
5eb91c98 653 return 0;
7a485870
DG
654
655error:
54d01ffb 656 session_unlock_list();
7a485870
DG
657 return -1;
658}
659
660/*
54d01ffb 661 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 662 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 663 *
d063d709 664 * Useful for CPU hotplug feature.
7a485870 665 */
2bdd86d4 666static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
667{
668 int ret = 0;
669 struct ltt_session *session;
670 struct ltt_kernel_channel *channel;
671
672 DBG("Updating kernel streams for channel fd %d", fd);
673
54d01ffb 674 session_lock_list();
b5541356 675 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 676 session_lock(session);
7a485870 677 if (session->kernel_session == NULL) {
54d01ffb 678 session_unlock(session);
7a485870
DG
679 continue;
680 }
d9800920
DG
681
682 /* This is not suppose to be 0 but this is an extra security check */
683 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 684 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
685 }
686
5eb91c98
DG
687 cds_list_for_each_entry(channel,
688 &session->kernel_session->channel_list.head, list) {
7a485870
DG
689 if (channel->fd == fd) {
690 DBG("Channel found, updating kernel streams");
691 ret = kernel_open_channel_stream(channel);
692 if (ret < 0) {
b3c750d2 693 goto error;
7a485870 694 }
d9800920 695
7a485870 696 /*
5eb91c98
DG
697 * Have we already sent fds to the consumer? If yes, it means
698 * that tracing is started so it is safe to send our updated
699 * stream fds.
7a485870 700 */
3bd1e081 701 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 702 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 703 session->kernel_session->consumer_fd, channel);
7a485870 704 if (ret < 0) {
b3c750d2 705 goto error;
7a485870
DG
706 }
707 }
b3c750d2 708 goto error;
7a485870
DG
709 }
710 }
54d01ffb 711 session_unlock(session);
7a485870 712 }
54d01ffb 713 session_unlock_list();
b3c750d2 714 return ret;
7a485870 715
b3c750d2 716error:
54d01ffb
DG
717 session_unlock(session);
718 session_unlock_list();
7a485870
DG
719 return ret;
720}
721
487cf67c
DG
722/*
723 * For each tracing session, update newly registered apps.
724 */
725static void update_ust_app(int app_sock)
726{
727 struct ltt_session *sess, *stmp;
728
729 /* For all tracing session(s) */
730 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG
731 if (sess->ust_session) {
732 ust_app_global_update(sess->ust_session, app_sock);
733 }
487cf67c
DG
734 }
735}
736
7a485870 737/*
d063d709 738 * This thread manage event coming from the kernel.
7a485870 739 *
d063d709
DG
740 * Features supported in this thread:
741 * -) CPU Hotplug
7a485870
DG
742 */
743static void *thread_manage_kernel(void *data)
744{
5eb91c98
DG
745 int ret, i, pollfd, update_poll_flag = 1;
746 uint32_t revents, nb_fd;
7a485870 747 char tmp;
5eb91c98 748 struct lttng_poll_event events;
7a485870
DG
749
750 DBG("Thread manage kernel started");
751
5eb91c98
DG
752 ret = create_thread_poll_set(&events, 2);
753 if (ret < 0) {
754 goto error;
755 }
756
757 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
758 if (ret < 0) {
759 goto error;
760 }
761
7a485870
DG
762 while (1) {
763 if (update_poll_flag == 1) {
5f822d0a
DG
764 /*
765 * Reset number of fd in the poll set. Always 2 since there is the thread
766 * quit pipe and the kernel pipe.
767 */
768 events.nb_fd = 2;
769
5eb91c98
DG
770 ret = update_kernel_poll(&events);
771 if (ret < 0) {
7a485870
DG
772 goto error;
773 }
774 update_poll_flag = 0;
775 }
776
5eb91c98
DG
777 nb_fd = LTTNG_POLL_GETNB(&events);
778
779 DBG("Thread kernel polling on %d fds", nb_fd);
780
781 /* Zeroed the poll events */
782 lttng_poll_reset(&events);
7a485870
DG
783
784 /* Poll infinite value of time */
5eb91c98 785 ret = lttng_poll_wait(&events, -1);
7a485870 786 if (ret < 0) {
7a485870
DG
787 goto error;
788 } else if (ret == 0) {
789 /* Should not happen since timeout is infinite */
85611738
DG
790 ERR("Return value of poll is 0 with an infinite timeout.\n"
791 "This should not have happened! Continuing...");
7a485870
DG
792 continue;
793 }
794
5eb91c98
DG
795 for (i = 0; i < nb_fd; i++) {
796 /* Fetch once the poll data */
797 revents = LTTNG_POLL_GETEV(&events, i);
798 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 799
5eb91c98
DG
800 /* Thread quit pipe has been closed. Killing thread. */
801 ret = check_thread_quit_pipe(pollfd, revents);
802 if (ret) {
803 goto error;
804 }
7a485870 805
5eb91c98
DG
806 /* Check for data on kernel pipe */
807 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
808 ret = read(kernel_poll_pipe[0], &tmp, 1);
809 update_poll_flag = 1;
810 continue;
811 } else {
812 /*
813 * New CPU detected by the kernel. Adding kernel stream to
814 * kernel session and updating the kernel consumer
815 */
816 if (revents & LPOLLIN) {
2bdd86d4 817 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
818 if (ret < 0) {
819 continue;
820 }
821 break;
822 /*
823 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
824 * and unregister kernel stream at this point.
825 */
7a485870 826 }
7a485870
DG
827 }
828 }
829 }
830
831error:
832 DBG("Kernel thread dying");
273ea72c
DG
833 close(kernel_poll_pipe[0]);
834 close(kernel_poll_pipe[1]);
5eb91c98
DG
835
836 lttng_poll_clean(&events);
837
7a485870
DG
838 return NULL;
839}
840
1d4b027a 841/*
3bd1e081 842 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 843 */
3bd1e081 844static void *thread_manage_consumer(void *data)
1d4b027a 845{
5eb91c98
DG
846 int sock = 0, i, ret, pollfd;
847 uint32_t revents, nb_fd;
1d4b027a 848 enum lttcomm_return_code code;
5eb91c98 849 struct lttng_poll_event events;
3bd1e081 850 struct consumer_data *consumer_data = data;
1d4b027a 851
3bd1e081 852 DBG("[thread] Manage consumer started");
1d4b027a 853
3bd1e081 854 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG
855 if (ret < 0) {
856 goto error;
857 }
858
5eb91c98
DG
859 /*
860 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
861 * Nothing more will be added to this poll set.
862 */
863 ret = create_thread_poll_set(&events, 2);
864 if (ret < 0) {
865 goto error;
866 }
273ea72c 867
3bd1e081 868 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
869 if (ret < 0) {
870 goto error;
871 }
872
873 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
874
875 /* Inifinite blocking call, waiting for transmission */
5eb91c98 876 ret = lttng_poll_wait(&events, -1);
273ea72c 877 if (ret < 0) {
273ea72c
DG
878 goto error;
879 }
880
5eb91c98
DG
881 for (i = 0; i < nb_fd; i++) {
882 /* Fetch once the poll data */
883 revents = LTTNG_POLL_GETEV(&events, i);
884 pollfd = LTTNG_POLL_GETFD(&events, i);
885
886 /* Thread quit pipe has been closed. Killing thread. */
887 ret = check_thread_quit_pipe(pollfd, revents);
888 if (ret) {
889 goto error;
890 }
891
892 /* Event on the registration socket */
3bd1e081 893 if (pollfd == consumer_data->err_sock) {
5eb91c98 894 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 895 ERR("consumer err socket poll error");
5eb91c98
DG
896 goto error;
897 }
898 }
273ea72c
DG
899 }
900
3bd1e081 901 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
902 if (sock < 0) {
903 goto error;
904 }
905
3bd1e081 906 DBG2("Receiving code from consumer err_sock");
ee0b0061 907
712ea556 908 /* Getting status code from kconsumerd */
54d01ffb
DG
909 ret = lttcomm_recv_unix_sock(sock, &code,
910 sizeof(enum lttcomm_return_code));
1d4b027a
DG
911 if (ret <= 0) {
912 goto error;
913 }
914
3bd1e081
MD
915 if (code == CONSUMERD_COMMAND_SOCK_READY) {
916 consumer_data->cmd_sock =
917 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
918 if (consumer_data->cmd_sock < 0) {
919 sem_post(&consumer_data->sem);
48842b30 920 PERROR("consumer connect");
1d4b027a
DG
921 goto error;
922 }
923 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
924 sem_post(&consumer_data->sem);
925 DBG("consumer command socket ready");
1d4b027a 926 } else {
3bd1e081 927 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
928 lttcomm_get_readable_code(-code));
929 goto error;
930 }
931
54d01ffb 932 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 933 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 934 if (ret < 0) {
72079cae
DG
935 goto error;
936 }
937
5eb91c98
DG
938 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
939 if (ret < 0) {
72079cae 940 goto error;
5eb91c98
DG
941 }
942
943 /* Update number of fd */
944 nb_fd = LTTNG_POLL_GETNB(&events);
945
946 /* Inifinite blocking call, waiting for transmission */
947 ret = lttng_poll_wait(&events, -1);
948 if (ret < 0) {
72079cae
DG
949 goto error;
950 }
951
5eb91c98
DG
952 for (i = 0; i < nb_fd; i++) {
953 /* Fetch once the poll data */
954 revents = LTTNG_POLL_GETEV(&events, i);
955 pollfd = LTTNG_POLL_GETFD(&events, i);
956
957 /* Thread quit pipe has been closed. Killing thread. */
958 ret = check_thread_quit_pipe(pollfd, revents);
959 if (ret) {
960 goto error;
961 }
962
963 /* Event on the kconsumerd socket */
964 if (pollfd == sock) {
965 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 966 ERR("consumer err socket second poll error");
5eb91c98
DG
967 goto error;
968 }
969 }
970 }
971
712ea556 972 /* Wait for any kconsumerd error */
54d01ffb
DG
973 ret = lttcomm_recv_unix_sock(sock, &code,
974 sizeof(enum lttcomm_return_code));
712ea556 975 if (ret <= 0) {
3bd1e081 976 ERR("consumer closed the command socket");
712ea556 977 goto error;
6f61d021 978 }
1d4b027a 979
3bd1e081 980 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 981
1d4b027a 982error:
3bd1e081
MD
983 DBG("consumer thread dying");
984 close(consumer_data->err_sock);
985 close(consumer_data->cmd_sock);
5eb91c98 986 close(sock);
273ea72c 987
3bd1e081
MD
988 unlink(consumer_data->err_unix_sock_path);
989 unlink(consumer_data->cmd_unix_sock_path);
990 consumer_data->pid = 0;
1d4b027a 991
5eb91c98 992 lttng_poll_clean(&events);
0177d773 993
5eb91c98 994 return NULL;
099e26bd
DG
995}
996
099e26bd
DG
997/*
998 * This thread manage application communication.
1d4b027a
DG
999 */
1000static void *thread_manage_apps(void *data)
099e26bd 1001{
5eb91c98
DG
1002 int i, ret, pollfd;
1003 uint32_t revents, nb_fd;
099e26bd 1004 struct ust_command ust_cmd;
5eb91c98 1005 struct lttng_poll_event events;
099e26bd
DG
1006
1007 DBG("[thread] Manage application started");
1008
f6a9efaa
DG
1009 rcu_register_thread();
1010 rcu_thread_online();
1011
5eb91c98
DG
1012 ret = create_thread_poll_set(&events, 2);
1013 if (ret < 0) {
1014 goto error;
1015 }
099e26bd 1016
5eb91c98
DG
1017 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1018 if (ret < 0) {
1019 goto error;
1020 }
099e26bd 1021
5eb91c98
DG
1022 while (1) {
1023 /* Zeroed the events structure */
1024 lttng_poll_reset(&events);
0177d773 1025
5eb91c98 1026 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1027
1028 DBG("Apps thread polling on %d fds", nb_fd);
1029
1030 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1031 ret = lttng_poll_wait(&events, -1);
099e26bd 1032 if (ret < 0) {
099e26bd
DG
1033 goto error;
1034 }
1035
5eb91c98
DG
1036 for (i = 0; i < nb_fd; i++) {
1037 /* Fetch once the poll data */
1038 revents = LTTNG_POLL_GETEV(&events, i);
1039 pollfd = LTTNG_POLL_GETFD(&events, i);
1040
1041 /* Thread quit pipe has been closed. Killing thread. */
1042 ret = check_thread_quit_pipe(pollfd, revents);
1043 if (ret) {
099e26bd 1044 goto error;
5eb91c98 1045 }
099e26bd 1046
5eb91c98
DG
1047 /* Inspect the apps cmd pipe */
1048 if (pollfd == apps_cmd_pipe[0]) {
1049 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1050 ERR("Apps command pipe error");
0177d773 1051 goto error;
5eb91c98
DG
1052 } else if (revents & LPOLLIN) {
1053 /* Empty pipe */
1054 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1055 if (ret < 0 || ret < sizeof(ust_cmd)) {
1056 perror("read apps cmd pipe");
1057 goto error;
1058 }
099e26bd 1059
5eb91c98 1060 /* Register applicaton to the session daemon */
56fff090 1061 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1062 ust_cmd.sock);
88ff5b7f 1063 if (ret == -ENOMEM) {
5eb91c98 1064 goto error;
88ff5b7f
MD
1065 } else if (ret < 0) {
1066 break;
5eb91c98
DG
1067 }
1068
acc7b41b
MD
1069 /*
1070 * Add channel(s) and event(s) to newly registered apps
1071 * from lttng global UST domain.
1072 */
1073 update_ust_app(ust_cmd.sock);
1074
5eb91c98
DG
1075 ret = ustctl_register_done(ust_cmd.sock);
1076 if (ret < 0) {
1077 /*
1078 * If the registration is not possible, we simply
1079 * unregister the apps and continue
1080 */
56fff090 1081 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1082 } else {
1083 /*
1084 * We just need here to monitor the close of the UST
1085 * socket and poll set monitor those by default.
1086 */
1087 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1088 if (ret < 0) {
1089 goto error;
1090 }
1091
54d01ffb
DG
1092 DBG("Apps with sock %d added to poll set",
1093 ust_cmd.sock);
5eb91c98 1094 }
487cf67c 1095
5eb91c98 1096 break;
0177d773 1097 }
5eb91c98
DG
1098 } else {
1099 /*
54d01ffb
DG
1100 * At this point, we know that a registered application made
1101 * the event at poll_wait.
5eb91c98
DG
1102 */
1103 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1104 /* Removing from the poll set */
1105 ret = lttng_poll_del(&events, pollfd);
1106 if (ret < 0) {
1107 goto error;
1108 }
099e26bd 1109
b9d9b220 1110 /* Socket closed on remote end. */
56fff090 1111 ust_app_unregister(pollfd);
5eb91c98
DG
1112 break;
1113 }
099e26bd
DG
1114 }
1115 }
099e26bd
DG
1116 }
1117
1118error:
1119 DBG("Application communication apps dying");
1120 close(apps_cmd_pipe[0]);
1121 close(apps_cmd_pipe[1]);
1122
5eb91c98 1123 lttng_poll_clean(&events);
099e26bd 1124
f6a9efaa
DG
1125 rcu_thread_offline();
1126 rcu_unregister_thread();
099e26bd
DG
1127 return NULL;
1128}
1129
1130/*
1131 * Dispatch request from the registration threads to the application
1132 * communication thread.
1133 */
1134static void *thread_dispatch_ust_registration(void *data)
1135{
1136 int ret;
1137 struct cds_wfq_node *node;
1138 struct ust_command *ust_cmd = NULL;
1139
1140 DBG("[thread] Dispatch UST command started");
1141
1142 while (!dispatch_thread_exit) {
1143 /* Atomically prepare the queue futex */
1144 futex_nto1_prepare(&ust_cmd_queue.futex);
1145
1146 do {
1147 /* Dequeue command for registration */
1148 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1149 if (node == NULL) {
00a17c97 1150 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1151 /* Continue thread execution */
1152 break;
1153 }
1154
1155 ust_cmd = caa_container_of(node, struct ust_command, node);
1156
2f50c8a3
DG
1157 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1158 " gid:%d sock:%d name:%s (version %d.%d)",
1159 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1160 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1161 ust_cmd->sock, ust_cmd->reg_msg.name,
1162 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1163 /*
1164 * Inform apps thread of the new application registration. This
1165 * call is blocking so we can be assured that the data will be read
1166 * at some point in time or wait to the end of the world :)
1167 */
1168 ret = write(apps_cmd_pipe[1], ust_cmd,
1169 sizeof(struct ust_command));
1170 if (ret < 0) {
1171 perror("write apps cmd pipe");
1172 if (errno == EBADF) {
1173 /*
1174 * We can't inform the application thread to process
1175 * registration. We will exit or else application
1176 * registration will not occur and tracing will never
1177 * start.
1178 */
1179 goto error;
1180 }
1181 }
1182 free(ust_cmd);
1183 } while (node != NULL);
1184
1185 /* Futex wait on queue. Blocking call on futex() */
1186 futex_nto1_wait(&ust_cmd_queue.futex);
1187 }
1188
1189error:
1190 DBG("Dispatch thread dying");
1191 return NULL;
1192}
1193
1194/*
1195 * This thread manage application registration.
1196 */
1197static void *thread_registration_apps(void *data)
1d4b027a 1198{
5eb91c98
DG
1199 int sock = 0, i, ret, pollfd;
1200 uint32_t revents, nb_fd;
1201 struct lttng_poll_event events;
099e26bd
DG
1202 /*
1203 * Get allocated in this thread, enqueued to a global queue, dequeued and
1204 * freed in the manage apps thread.
1205 */
1206 struct ust_command *ust_cmd = NULL;
1d4b027a 1207
099e26bd 1208 DBG("[thread] Manage application registration started");
1d4b027a
DG
1209
1210 ret = lttcomm_listen_unix_sock(apps_sock);
1211 if (ret < 0) {
1212 goto error;
1213 }
1214
5eb91c98
DG
1215 /*
1216 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1217 * more will be added to this poll set.
1218 */
1219 ret = create_thread_poll_set(&events, 2);
1220 if (ret < 0) {
1221 goto error;
1222 }
273ea72c 1223
5eb91c98
DG
1224 /* Add the application registration socket */
1225 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1226 if (ret < 0) {
1227 goto error;
1228 }
273ea72c 1229
1d4b027a 1230 /* Notify all applications to register */
0fdd1e2c
DG
1231 ret = notify_ust_apps(1);
1232 if (ret < 0) {
1233 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1234 "Execution continues but there might be problem for already\n"
1235 "running applications that wishes to register.");
0fdd1e2c 1236 }
1d4b027a
DG
1237
1238 while (1) {
1239 DBG("Accepting application registration");
273ea72c 1240
5eb91c98
DG
1241 nb_fd = LTTNG_POLL_GETNB(&events);
1242
273ea72c 1243 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1244 ret = lttng_poll_wait(&events, -1);
273ea72c 1245 if (ret < 0) {
273ea72c
DG
1246 goto error;
1247 }
1248
5eb91c98
DG
1249 for (i = 0; i < nb_fd; i++) {
1250 /* Fetch once the poll data */
1251 revents = LTTNG_POLL_GETEV(&events, i);
1252 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1253
5eb91c98
DG
1254 /* Thread quit pipe has been closed. Killing thread. */
1255 ret = check_thread_quit_pipe(pollfd, revents);
1256 if (ret) {
90014c57
DG
1257 goto error;
1258 }
1d4b027a 1259
5eb91c98
DG
1260 /* Event on the registration socket */
1261 if (pollfd == apps_sock) {
1262 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1263 ERR("Register apps socket poll error");
1264 goto error;
1265 } else if (revents & LPOLLIN) {
1266 sock = lttcomm_accept_unix_sock(apps_sock);
1267 if (sock < 0) {
1268 goto error;
1269 }
099e26bd 1270
5eb91c98 1271 /* Create UST registration command for enqueuing */
ba7f0ae5 1272 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1273 if (ust_cmd == NULL) {
ba7f0ae5 1274 perror("ust command zmalloc");
5eb91c98
DG
1275 goto error;
1276 }
1d4b027a 1277
5eb91c98
DG
1278 /*
1279 * Using message-based transmissions to ensure we don't
1280 * have to deal with partially received messages.
1281 */
1282 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1283 sizeof(struct ust_register_msg));
1284 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1285 if (ret < 0) {
1286 perror("lttcomm_recv_unix_sock register apps");
1287 } else {
1288 ERR("Wrong size received on apps register");
1289 }
1290 free(ust_cmd);
1291 close(sock);
1292 continue;
1293 }
099e26bd 1294
5eb91c98 1295 ust_cmd->sock = sock;
099e26bd 1296
5eb91c98
DG
1297 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1298 " gid:%d sock:%d name:%s (version %d.%d)",
1299 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1300 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1301 ust_cmd->sock, ust_cmd->reg_msg.name,
1302 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1303
5eb91c98
DG
1304 /*
1305 * Lock free enqueue the registration request. The red pill
54d01ffb 1306 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1307 */
1308 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1309
1310 /*
1311 * Wake the registration queue futex. Implicit memory
1312 * barrier with the exchange in cds_wfq_enqueue.
1313 */
1314 futex_nto1_wake(&ust_cmd_queue.futex);
1315 }
1316 }
90014c57 1317 }
1d4b027a
DG
1318 }
1319
1320error:
0fdd1e2c
DG
1321 DBG("UST Registration thread dying");
1322
1323 /* Notify that the registration thread is gone */
1324 notify_ust_apps(0);
1325
1326 close(apps_sock);
1327 close(sock);
273ea72c 1328 unlink(apps_unix_sock_path);
0fdd1e2c 1329
5eb91c98
DG
1330 lttng_poll_clean(&events);
1331
1d4b027a
DG
1332 return NULL;
1333}
1334
8c0faa1d 1335/*
3bd1e081 1336 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1337 * exec or it will fails.
8c0faa1d 1338 */
3bd1e081 1339static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1340{
1341 int ret;
ee0b0061
DG
1342 struct timespec timeout;
1343
1344 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1345 timeout.tv_nsec = 0;
8c0faa1d
DG
1346
1347 /* Setup semaphore */
3bd1e081 1348 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1349 if (ret < 0) {
3bd1e081 1350 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1351 goto error;
1352 }
8c0faa1d 1353
3bd1e081
MD
1354 ret = pthread_create(&consumer_data->thread, NULL,
1355 thread_manage_consumer, consumer_data);
8c0faa1d 1356 if (ret != 0) {
3bd1e081 1357 PERROR("pthread_create consumer");
ee0b0061 1358 ret = -1;
8c0faa1d
DG
1359 goto error;
1360 }
1361
ee0b0061
DG
1362 /* Get time for sem_timedwait absolute timeout */
1363 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1364 if (ret < 0) {
3bd1e081 1365 PERROR("clock_gettime spawn consumer");
ee0b0061 1366 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1367 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1368 } else {
1369 /* Normal timeout if the gettime was successful */
1370 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1371 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1372 }
8c0faa1d 1373
ee0b0061
DG
1374 if (ret < 0) {
1375 if (errno == ETIMEDOUT) {
1376 /*
1377 * Call has timed out so we kill the kconsumerd_thread and return
1378 * an error.
1379 */
3bd1e081
MD
1380 ERR("The consumer thread was never ready. Killing it");
1381 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1382 if (ret < 0) {
3bd1e081 1383 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1384 }
1385 } else {
3bd1e081 1386 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1387 }
1388 goto error;
1389 }
1390
3bd1e081
MD
1391 pthread_mutex_lock(&consumer_data->pid_mutex);
1392 if (consumer_data->pid == 0) {
712ea556 1393 ERR("Kconsumerd did not start");
3bd1e081 1394 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1395 goto error;
1396 }
3bd1e081 1397 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1398
8c0faa1d
DG
1399 return 0;
1400
1401error:
1402 return ret;
1403}
1404
d9800920 1405/*
3bd1e081 1406 * Join consumer thread
d9800920 1407 */
3bd1e081 1408static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1409{
1410 void *status;
1411 int ret;
1412
3bd1e081
MD
1413 if (consumer_data->pid != 0) {
1414 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1415 if (ret) {
3bd1e081 1416 ERR("Error killing consumer daemon");
cf3af59e
MD
1417 return ret;
1418 }
3bd1e081 1419 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1420 } else {
1421 return 0;
1422 }
1423}
1424
8c0faa1d 1425/*
3bd1e081 1426 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1427 *
d063d709 1428 * Return pid if successful else -1.
8c0faa1d 1429 */
3bd1e081 1430static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1431{
1432 int ret;
1433 pid_t pid;
53086306 1434 const char *verbosity;
8c0faa1d 1435
3bd1e081 1436 DBG("Spawning consumerd");
c49dc785 1437
8c0faa1d
DG
1438 pid = fork();
1439 if (pid == 0) {
1440 /*
3bd1e081 1441 * Exec consumerd.
8c0faa1d 1442 */
3bd1e081 1443 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG
1444 verbosity = "--verbose";
1445 } else {
1446 verbosity = "--quiet";
1447 }
3bd1e081
MD
1448 switch (consumer_data->type) {
1449 case LTTNG_CONSUMER_KERNEL:
1450 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1451 "lttng-consumerd", verbosity, "-k", NULL);
1452 break;
1453 case LTTNG_CONSUMER_UST:
1454 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1455 "lttng-consumerd", verbosity, "-u", NULL);
1456 break;
1457 default:
1458 perror("unknown consumer type");
1459 exit(EXIT_FAILURE);
1460 }
8c0faa1d
DG
1461 if (errno != 0) {
1462 perror("kernel start consumer exec");
1463 }
1464 exit(EXIT_FAILURE);
1465 } else if (pid > 0) {
1466 ret = pid;
8c0faa1d 1467 } else {
3bd1e081 1468 perror("start consumer fork");
8c0faa1d 1469 ret = -errno;
8c0faa1d 1470 }
8c0faa1d
DG
1471 return ret;
1472}
1473
693bd40b 1474/*
3bd1e081 1475 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1476 */
3bd1e081 1477static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1478{
1479 int ret;
1480
3bd1e081
MD
1481 pthread_mutex_lock(&consumer_data->pid_mutex);
1482 if (consumer_data->pid != 0) {
1483 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1484 goto end;
1485 }
693bd40b 1486
3bd1e081 1487 ret = spawn_consumerd(consumer_data);
c49dc785 1488 if (ret < 0) {
3bd1e081
MD
1489 ERR("Spawning consumerd failed");
1490 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1491 goto error;
693bd40b 1492 }
c49dc785 1493
3bd1e081
MD
1494 /* Setting up the consumer_data pid */
1495 consumer_data->pid = ret;
48842b30 1496 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1497 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1498
3bd1e081
MD
1499 DBG2("Spawning consumer control thread");
1500 ret = spawn_consumer_thread(consumer_data);
693bd40b 1501 if (ret < 0) {
3bd1e081 1502 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1503 goto error;
1504 }
1505
c49dc785 1506end:
693bd40b
DG
1507 return 0;
1508
1509error:
1510 return ret;
1511}
1512
b73401da 1513/*
d063d709 1514 * modprobe_kernel_modules
b73401da
DG
1515 */
1516static int modprobe_kernel_modules(void)
1517{
ab147185 1518 int ret = 0, i;
b73401da
DG
1519 char modprobe[256];
1520
ab147185
MD
1521 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1522 ret = snprintf(modprobe, sizeof(modprobe),
1523 "/sbin/modprobe %s%s",
24b487b8 1524 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1525 kernel_modules_list[i].name);
b73401da
DG
1526 if (ret < 0) {
1527 perror("snprintf modprobe");
1528 goto error;
1529 }
ab147185 1530 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1531 ret = system(modprobe);
ab147185
MD
1532 if (ret == -1) {
1533 ERR("Unable to launch modprobe for module %s",
1534 kernel_modules_list[i].name);
1535 } else if (kernel_modules_list[i].required
d9800920 1536 && WEXITSTATUS(ret) != 0) {
ab147185
MD
1537 ERR("Unable to load module %s",
1538 kernel_modules_list[i].name);
1539 } else {
1540 DBG("Modprobe successfully %s",
1541 kernel_modules_list[i].name);
1542 }
1543 }
1544
1545error:
1546 return ret;
1547}
1548
b73401da 1549/*
d063d709 1550 * mount_debugfs
b73401da
DG
1551 */
1552static int mount_debugfs(char *path)
1553{
1554 int ret;
1555 char *type = "debugfs";
1556
996b65c8 1557 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1558 if (ret < 0) {
7272acf5 1559 PERROR("Cannot create debugfs path");
b73401da
DG
1560 goto error;
1561 }
1562
1563 ret = mount(type, path, type, 0, NULL);
1564 if (ret < 0) {
7272acf5 1565 PERROR("Cannot mount debugfs");
b73401da
DG
1566 goto error;
1567 }
1568
1569 DBG("Mounted debugfs successfully at %s", path);
1570
1571error:
1572 return ret;
1573}
1574
8c0faa1d 1575/*
d063d709 1576 * Setup necessary data for kernel tracer action.
8c0faa1d 1577 */
f3ed775e 1578static void init_kernel_tracer(void)
8c0faa1d 1579{
b73401da
DG
1580 int ret;
1581 char *proc_mounts = "/proc/mounts";
1582 char line[256];
684d34d2 1583 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG
1584 FILE *fp;
1585
1586 /* Detect debugfs */
1587 fp = fopen(proc_mounts, "r");
1588 if (fp == NULL) {
1589 ERR("Unable to probe %s", proc_mounts);
1590 goto error;
1591 }
1592
1593 while (fgets(line, sizeof(line), fp) != NULL) {
1594 if (strstr(line, "debugfs") != NULL) {
1595 /* Remove first string */
1596 strtok(line, " ");
1597 /* Dup string here so we can reuse line later on */
1598 debugfs_path = strdup(strtok(NULL, " "));
1599 DBG("Got debugfs path : %s", debugfs_path);
1600 break;
1601 }
1602 }
1603
1604 fclose(fp);
1605
1606 /* Mount debugfs if needded */
1607 if (debugfs_path == NULL) {
1608 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1609 if (ret < 0) {
1610 perror("asprintf debugfs path");
1611 goto error;
1612 }
1613 ret = mount_debugfs(debugfs_path);
1614 if (ret < 0) {
7272acf5 1615 perror("Cannot mount debugfs");
b73401da
DG
1616 goto error;
1617 }
1618 }
1619
1620 /* Modprobe lttng kernel modules */
1621 ret = modprobe_kernel_modules();
1622 if (ret < 0) {
1623 goto error;
1624 }
1625
1626 /* Setup lttng kernel path */
1627 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1628 if (ret < 0) {
1629 perror("asprintf lttng path");
1630 goto error;
1631 }
1632
1633 /* Open debugfs lttng */
1634 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1635 if (kernel_tracer_fd < 0) {
b73401da
DG
1636 DBG("Failed to open %s", lttng_path);
1637 goto error;
8c0faa1d
DG
1638 }
1639
b73401da
DG
1640 free(lttng_path);
1641 free(debugfs_path);
f3ed775e 1642 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG
1643 return;
1644
1645error:
1646 if (lttng_path) {
1647 free(lttng_path);
1648 }
1649 if (debugfs_path) {
1650 free(debugfs_path);
1651 }
1652 WARN("No kernel tracer available");
1653 kernel_tracer_fd = 0;
1654 return;
f3ed775e 1655}
33a2b854 1656
f3ed775e 1657/*
54d01ffb 1658 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1659 */
54d01ffb 1660static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1661{
f40799e8 1662 int ret = 0;
8c0faa1d 1663
3bd1e081 1664 if (session->consumer_fds_sent == 0) {
d9800920 1665 /*
54d01ffb
DG
1666 * Assign default kernel consumer socket if no consumer assigned to the
1667 * kernel session. At this point, it's NOT suppose to be 0 but this is
1668 * an extra security check.
d9800920
DG
1669 */
1670 if (session->consumer_fd == 0) {
3bd1e081 1671 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1672 }
1673
2bdd86d4 1674 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1675 if (ret < 0) {
f3ed775e
DG
1676 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1677 goto error;
1678 }
1d4b027a 1679
3bd1e081 1680 session->consumer_fds_sent = 1;
f3ed775e 1681 }
1d4b027a
DG
1682
1683error:
1684 return ret;
8c0faa1d
DG
1685}
1686
0177d773
DG
1687/*
1688 * Create an UST session and add it to the session ust list.
1689 */
44d3bd01
DG
1690static int create_ust_session(struct ltt_session *session,
1691 struct lttng_domain *domain)
0177d773 1692{
44d3bd01 1693 int ret;
48842b30 1694 unsigned int uid;
13384287 1695 struct ltt_ust_session *lus = NULL;
44d3bd01
DG
1696
1697 switch (domain->type) {
48842b30 1698 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1699 break;
1700 default:
13384287 1701 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1702 goto error;
1703 }
0177d773
DG
1704
1705 DBG("Creating UST session");
1706
48842b30
DG
1707 session_lock_list();
1708 uid = session_list_ptr->count;
1709 session_unlock_list();
1710
1711 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1712 if (lus == NULL) {
44d3bd01 1713 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1714 goto error;
1715 }
1716
48842b30 1717 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG
1718 geteuid(), allowed_group());
1719 if (ret < 0) {
1720 if (ret != -EEXIST) {
1721 ERR("Trace directory creation error");
44d3bd01 1722 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1723 goto error;
1724 }
1725 }
1726
f6a9efaa
DG
1727 /* The domain type dictate different actions on session creation */
1728 switch (domain->type) {
48842b30
DG
1729 case LTTNG_DOMAIN_UST:
1730 /* No ustctl for the global UST domain */
1731 break;
1732 default:
36dc12cc 1733 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1734 goto error;
0177d773 1735 }
f6a9efaa 1736 session->ust_session = lus;
44d3bd01
DG
1737
1738 return LTTCOMM_OK;
0177d773
DG
1739
1740error:
1741 free(lus);
1742 return ret;
1743}
1744
333f285e 1745/*
d063d709 1746 * Create a kernel tracer session then create the default channel.
333f285e 1747 */
f3ed775e 1748static int create_kernel_session(struct ltt_session *session)
333f285e 1749{
f3ed775e 1750 int ret;
f3ed775e
DG
1751
1752 DBG("Creating kernel session");
1753
1754 ret = kernel_create_session(session, kernel_tracer_fd);
1755 if (ret < 0) {
1756 ret = LTTCOMM_KERN_SESS_FAIL;
1757 goto error;
333f285e
DG
1758 }
1759
d9800920 1760 /* Set kernel consumer socket fd */
3bd1e081
MD
1761 if (kconsumer_data.cmd_sock) {
1762 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1763 }
1764
63053e7c
DG
1765 ret = mkdir_recursive(session->kernel_session->trace_path,
1766 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1767 if (ret < 0) {
996b65c8 1768 if (ret != -EEXIST) {
7a485870
DG
1769 ERR("Trace directory creation error");
1770 goto error;
1771 }
1772 }
1773
f3ed775e
DG
1774error:
1775 return ret;
333f285e
DG
1776}
1777
6c9cc2ab
DG
1778/*
1779 * Using the session list, filled a lttng_session array to send back to the
1780 * client for session listing.
1781 *
1782 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1783 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG
1784 */
1785static void list_lttng_sessions(struct lttng_session *sessions)
1786{
1787 int i = 0;
1788 struct ltt_session *session;
1789
1790 DBG("Getting all available session");
1791 /*
1792 * Iterate over session list and append data after the control struct in
1793 * the buffer.
1794 */
1795 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1796 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1797 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1798 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1799 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1800 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
1801 i++;
1802 }
1803}
1804
9f19cc17
DG
1805/*
1806 * Fill lttng_channel array of all channels.
1807 */
b551a063 1808static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
1809 struct lttng_channel *channels)
1810{
1811 int i = 0;
1812 struct ltt_kernel_channel *kchan;
1813
1814 DBG("Listing channels for session %s", session->name);
1815
b551a063
DG
1816 switch (domain) {
1817 case LTTNG_DOMAIN_KERNEL:
1818 /* Kernel channels */
1819 if (session->kernel_session != NULL) {
1820 cds_list_for_each_entry(kchan,
1821 &session->kernel_session->channel_list.head, list) {
1822 /* Copy lttng_channel struct to array */
1823 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1824 channels[i].enabled = kchan->enabled;
1825 i++;
1826 }
1827 }
1828 break;
1829 case LTTNG_DOMAIN_UST:
1830 {
1831 struct cds_lfht_iter iter;
1832 struct ltt_ust_channel *uchan;
1833
1834 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1835 &iter, uchan, node) {
1836 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1837 channels[i].attr.overwrite = uchan->attr.overwrite;
1838 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1839 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1840 channels[i].attr.switch_timer_interval =
1841 uchan->attr.switch_timer_interval;
1842 channels[i].attr.read_timer_interval =
1843 uchan->attr.read_timer_interval;
1844 channels[i].attr.output = uchan->attr.output;
1845 }
1846 break;
1847 }
1848 default:
1849 break;
1850 }
1851}
1852
1853/*
1854 * Create a list of ust global domain events.
1855 */
1856static int list_lttng_ust_global_events(char *channel_name,
1857 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1858{
1859 int i = 0, ret = 0;
1860 unsigned int nb_event = 0;
1861 struct cds_lfht_iter iter;
1862 struct ltt_ust_channel *uchan;
1863 struct ltt_ust_event *uevent;
1864 struct lttng_event *tmp;
1865
1866 DBG("Listing UST global events for channel %s", channel_name);
1867
1868 rcu_read_lock();
1869
1870 /* Count events in all channels */
1871 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1872 nb_event += hashtable_get_count(uchan->events);
1873 }
1874
1875 if (nb_event == 0) {
1876 ret = nb_event;
1877 goto error;
1878 }
1879
1880 DBG3("Listing UST global %d events", nb_event);
1881
1882 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
1883 if (tmp == NULL) {
1884 ret = -LTTCOMM_FATAL;
1885 goto error;
1886 }
1887
1888 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1889 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
1890 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
1891 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
37357452 1892 tmp[i].enabled = uevent->enabled;
b551a063
DG
1893 switch (uevent->attr.instrumentation) {
1894 case LTTNG_UST_TRACEPOINT:
1895 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
1896 break;
1897 case LTTNG_UST_PROBE:
1898 tmp[i].type = LTTNG_EVENT_PROBE;
1899 break;
1900 case LTTNG_UST_FUNCTION:
1901 tmp[i].type = LTTNG_EVENT_FUNCTION;
1902 break;
1903 }
9f19cc17
DG
1904 i++;
1905 }
1906 }
1907
b551a063
DG
1908 ret = nb_event;
1909 *events = tmp;
1910
1911error:
1912 rcu_read_unlock();
1913 return ret;
9f19cc17
DG
1914}
1915
1916/*
b551a063 1917 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 1918 */
b551a063
DG
1919static int list_lttng_kernel_events(char *channel_name,
1920 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 1921{
b551a063
DG
1922 int i = 0, ret;
1923 unsigned int nb_event;
9f19cc17 1924 struct ltt_kernel_event *event;
b551a063
DG
1925 struct ltt_kernel_channel *kchan;
1926
1927 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
1928 if (kchan == NULL) {
1929 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1930 goto error;
1931 }
1932
1933 nb_event = kchan->event_count;
9f19cc17
DG
1934
1935 DBG("Listing events for channel %s", kchan->channel->name);
1936
b551a063
DG
1937 if (nb_event == 0) {
1938 ret = nb_event;
1939 goto error;
1940 }
1941
1942 *events = zmalloc(nb_event * sizeof(struct lttng_event));
1943 if (*events == NULL) {
1944 ret = LTTCOMM_FATAL;
1945 goto error;
1946 }
1947
9f19cc17
DG
1948 /* Kernel channels */
1949 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
1950 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
1951 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1952 (*events)[i].enabled = event->enabled;
9f19cc17
DG
1953 switch (event->event->instrumentation) {
1954 case LTTNG_KERNEL_TRACEPOINT:
b551a063 1955 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
1956 break;
1957 case LTTNG_KERNEL_KPROBE:
1958 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
1959 (*events)[i].type = LTTNG_EVENT_PROBE;
1960 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
1961 sizeof(struct lttng_kernel_kprobe));
1962 break;
1963 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
1964 (*events)[i].type = LTTNG_EVENT_FUNCTION;
1965 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
1966 sizeof(struct lttng_kernel_function));
1967 break;
0133c199 1968 case LTTNG_KERNEL_NOOP:
b551a063 1969 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 1970 break;
a54bd42d 1971 case LTTNG_KERNEL_SYSCALL:
b551a063 1972 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1973 break;
7a3d1328
MD
1974 case LTTNG_KERNEL_ALL:
1975 assert(0);
1976 break;
9f19cc17
DG
1977 }
1978 i++;
1979 }
b551a063
DG
1980
1981 return nb_event;
1982
1983error:
1984 return ret;
9f19cc17
DG
1985}
1986
fac6795d 1987/*
54d01ffb 1988 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1989 */
54d01ffb
DG
1990static int cmd_disable_channel(struct ltt_session *session,
1991 int domain, char *channel_name)
fac6795d 1992{
54d01ffb 1993 int ret;
379473d2 1994
54d01ffb
DG
1995 switch (domain) {
1996 case LTTNG_DOMAIN_KERNEL:
1997 ret = channel_kernel_disable(session->kernel_session,
1998 channel_name);
1999 if (ret != LTTCOMM_OK) {
333f285e
DG
2000 goto error;
2001 }
54d01ffb
DG
2002
2003 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 2004 break;
44d3bd01
DG
2005 case LTTNG_DOMAIN_UST_PID:
2006 break;
d0254c7c 2007 default:
44d3bd01 2008 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 2009 goto error;
20fe2104
DG
2010 }
2011
54d01ffb 2012 ret = LTTCOMM_OK;
d65106b1 2013
54d01ffb
DG
2014error:
2015 return ret;
2016}
2017
56fff090
DG
2018/*
2019 * Copy channel from attributes and set it in the application channel list.
2020 */
f6a9efaa 2021/*
56fff090
DG
2022static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2023 struct lttng_channel *attr, struct ust_app *app)
2024{
2025 int ret;
2026 struct ltt_ust_channel *uchan, *new_chan;
2027
f6a9efaa 2028 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG
2029 if (uchan == NULL) {
2030 ret = LTTCOMM_FATAL;
2031 goto error;
2032 }
2033
2034 new_chan = trace_ust_create_channel(attr, usess->path);
2035 if (new_chan == NULL) {
2036 PERROR("malloc ltt_ust_channel");
2037 ret = LTTCOMM_FATAL;
2038 goto error;
2039 }
2040
2041 ret = channel_ust_copy(new_chan, uchan);
2042 if (ret < 0) {
2043 ret = LTTCOMM_FATAL;
2044 goto error;
2045 }
2046
56fff090
DG
2047error:
2048 return ret;
2049}
f6a9efaa 2050*/
56fff090 2051
54d01ffb
DG
2052/*
2053 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2054 */
44d3bd01
DG
2055static int cmd_enable_channel(struct ltt_session *session,
2056 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG
2057{
2058 int ret;
f6a9efaa
DG
2059 struct ltt_ust_session *usess = session->ust_session;
2060
5d56b5aa 2061 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2062
44d3bd01
DG
2063 switch (domain->type) {
2064 case LTTNG_DOMAIN_KERNEL:
2065 {
2066 struct ltt_kernel_channel *kchan;
54d01ffb 2067
44d3bd01
DG
2068 kchan = trace_kernel_get_channel_by_name(attr->name,
2069 session->kernel_session);
2070 if (kchan == NULL) {
2071 ret = channel_kernel_create(session->kernel_session,
2072 attr, kernel_poll_pipe[1]);
2073 } else {
2074 ret = channel_kernel_enable(session->kernel_session, kchan);
2075 }
2076
2077 if (ret != LTTCOMM_OK) {
2078 goto error;
2079 }
2080
2081 kernel_wait_quiescent(kernel_tracer_fd);
2082 break;
2083 }
f6a9efaa
DG
2084 case LTTNG_DOMAIN_UST:
2085 {
2086 struct ltt_ust_channel *uchan;
2087
48842b30 2088 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2089
48842b30 2090 /* Get channel in global UST domain HT */
f6a9efaa
DG
2091 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2092 attr->name);
2093 if (uchan == NULL) {
48842b30 2094 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG
2095 if (uchan == NULL) {
2096 ret = LTTCOMM_UST_CHAN_FAIL;
2097 goto error;
2098 }
d5cd1f34 2099
f6a9efaa
DG
2100 rcu_read_lock();
2101 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2102 rcu_read_unlock();
48842b30 2103 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa
DG
2104 } else {
2105 ret = LTTCOMM_UST_CHAN_EXIST;
2106 goto error;
2107 }
2108
421cb601 2109 /* Add channel to all registered applications */
5b4a0ec0 2110 ret = ust_app_create_channel_all(usess, uchan);
509cbaf8 2111 if (ret != 0) {
48842b30
DG
2112 goto error;
2113 }
f6a9efaa 2114
37357452
DG
2115 uchan->enabled = 1;
2116
f6a9efaa
DG
2117 break;
2118 }
44d3bd01
DG
2119 case LTTNG_DOMAIN_UST_PID:
2120 {
f6a9efaa 2121 /*
56fff090
DG
2122 int sock;
2123 struct ltt_ust_channel *uchan;
44d3bd01 2124 struct ltt_ust_session *usess;
56fff090 2125 struct ust_app *app;
44d3bd01
DG
2126
2127 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2128 domain->attr.pid);
2129 if (usess == NULL) {
2130 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2131 goto error;
2132 }
2133
56fff090 2134 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG
2135 if (app == NULL) {
2136 ret = LTTCOMM_APP_NOT_FOUND;
2137 goto error;
2138 }
56fff090 2139 sock = app->sock;
44d3bd01
DG
2140
2141 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2142 if (uchan == NULL) {
56fff090 2143 ret = channel_ust_create(usess, attr, sock);
44d3bd01 2144 } else {
56fff090 2145 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG
2146 }
2147
2148 if (ret != LTTCOMM_OK) {
2149 goto error;
2150 }
2151
56fff090
DG
2152 ret = copy_ust_channel_to_app(usess, attr, app);
2153 if (ret != LTTCOMM_OK) {
44d3bd01
DG
2154 goto error;
2155 }
2156
44d3bd01
DG
2157 DBG("UST channel %s created for app sock %d with pid %d",
2158 attr->name, app->sock, domain->attr.pid);
f6a9efaa
DG
2159 */
2160 ret = LTTCOMM_NOT_IMPLEMENTED;
2161 goto error;
44d3bd01
DG
2162 }
2163 default:
2164 ret = LTTCOMM_UNKNOWN_DOMAIN;
2165 goto error;
54d01ffb
DG
2166 }
2167
2168 ret = LTTCOMM_OK;
2169
2170error:
2171 return ret;
2172}
2173
2174/*
2175 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2176 */
2177static int cmd_disable_event(struct ltt_session *session, int domain,
2178 char *channel_name, char *event_name)
2179{
2180 int ret;
54d01ffb
DG
2181
2182 switch (domain) {
2183 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2184 {
2185 struct ltt_kernel_channel *kchan;
2186
54d01ffb
DG
2187 kchan = trace_kernel_get_channel_by_name(channel_name,
2188 session->kernel_session);
2189 if (kchan == NULL) {
2190 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2191 goto error;
d65106b1
DG
2192 }
2193
7a3d1328 2194 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG
2195 if (ret != LTTCOMM_OK) {
2196 goto error;
2197 }
2198
2199 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2200 break;
2bdd86d4
MD
2201 }
2202 case LTTNG_DOMAIN_UST:
2bdd86d4
MD
2203 case LTTNG_DOMAIN_UST_EXEC_NAME:
2204 case LTTNG_DOMAIN_UST_PID:
2205 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2206 default:
2bdd86d4 2207 /* TODO: Other UST domains */
54d01ffb
DG
2208 ret = LTTCOMM_NOT_IMPLEMENTED;
2209 goto error;
d65106b1 2210 }
26cc6b4e 2211
54d01ffb
DG
2212 ret = LTTCOMM_OK;
2213
2214error:
2215 return ret;
2216}
2217
2218/*
2219 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2220 */
2221static int cmd_disable_event_all(struct ltt_session *session, int domain,
2222 char *channel_name)
2223{
2224 int ret;
2225 struct ltt_kernel_channel *kchan;
2226
2227 switch (domain) {
2228 case LTTNG_DOMAIN_KERNEL:
2229 kchan = trace_kernel_get_channel_by_name(channel_name,
2230 session->kernel_session);
2231 if (kchan == NULL) {
2232 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2233 goto error;
26cc6b4e
DG
2234 }
2235
54d01ffb
DG
2236 ret = event_kernel_disable_all(session->kernel_session, kchan);
2237 if (ret != LTTCOMM_OK) {
0b97ec54 2238 goto error;
26cc6b4e
DG
2239 }
2240
54d01ffb 2241 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2242 break;
54d01ffb
DG
2243 default:
2244 /* TODO: Userspace tracing */
2245 ret = LTTCOMM_NOT_IMPLEMENTED;
2246 goto error;
26cc6b4e 2247 }
e953ef25 2248
54d01ffb 2249 ret = LTTCOMM_OK;
e953ef25 2250
54d01ffb
DG
2251error:
2252 return ret;
2253}
f5177a38 2254
54d01ffb
DG
2255/*
2256 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2257 */
2258static int cmd_add_context(struct ltt_session *session, int domain,
2259 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2260{
2261 int ret;
f5177a38 2262
54d01ffb
DG
2263 switch (domain) {
2264 case LTTNG_DOMAIN_KERNEL:
2265 /* Add kernel context to kernel tracer */
2266 ret = context_kernel_add(session->kernel_session, ctx,
2267 event_name, channel_name);
2268 if (ret != LTTCOMM_OK) {
f5177a38 2269 goto error;
e953ef25 2270 }
2bdd86d4
MD
2271 break;
2272 case LTTNG_DOMAIN_UST:
2273 {
48842b30
DG
2274 /*
2275 struct ltt_ust_session *usess;
e953ef25 2276
48842b30
DG
2277 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2278 ret = context_ust_add(usess, ctx,
2279 event_name, channel_name, domain);
2bdd86d4
MD
2280 if (ret != LTTCOMM_OK) {
2281 goto error;
2282 }
2283 }
e953ef25 2284 break;
48842b30 2285 */
2bdd86d4 2286 }
54d01ffb 2287 default:
2bdd86d4 2288 /* TODO: UST other domains */
54d01ffb
DG
2289 ret = LTTCOMM_NOT_IMPLEMENTED;
2290 goto error;
e953ef25 2291 }
950131af 2292
54d01ffb 2293 ret = LTTCOMM_OK;
950131af 2294
54d01ffb
DG
2295error:
2296 return ret;
2297}
2298
2299/*
2300 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2301 */
2302static int cmd_enable_event(struct ltt_session *session, int domain,
2303 char *channel_name, struct lttng_event *event)
2304{
2305 int ret;
f6cd6b0f 2306 struct lttng_channel *attr;
48842b30 2307 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2308
2309 switch (domain) {
2310 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2311 {
2312 struct ltt_kernel_channel *kchan;
2313
54d01ffb
DG
2314 kchan = trace_kernel_get_channel_by_name(channel_name,
2315 session->kernel_session);
2316 if (kchan == NULL) {
f6cd6b0f
DG
2317 attr = channel_new_default_attr(domain);
2318 if (attr == NULL) {
2319 ret = LTTCOMM_FATAL;
2320 goto error;
2321 }
2322 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2323
54d01ffb 2324 /* This call will notify the kernel thread */
44d3bd01 2325 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2326 attr, kernel_poll_pipe[1]);
54d01ffb 2327 if (ret != LTTCOMM_OK) {
f5177a38
DG
2328 goto error;
2329 }
54d01ffb 2330 }
950131af 2331
54d01ffb
DG
2332 /* Get the newly created kernel channel pointer */
2333 kchan = trace_kernel_get_channel_by_name(channel_name,
2334 session->kernel_session);
2335 if (kchan == NULL) {
2336 /* This sould not happen... */
2337 ret = LTTCOMM_FATAL;
2338 goto error;
2339 }
f5177a38 2340
48842b30
DG
2341 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2342 event);
54d01ffb 2343 if (ret != LTTCOMM_OK) {
f5177a38 2344 goto error;
950131af
DG
2345 }
2346
54d01ffb 2347 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2348 break;
2bdd86d4
MD
2349 }
2350 case LTTNG_DOMAIN_UST:
2351 {
48842b30
DG
2352 struct ltt_ust_channel *uchan;
2353 struct ltt_ust_event *uevent;
2bdd86d4 2354
48842b30
DG
2355 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2356 channel_name);
2357 if (uchan == NULL) {
2358 /* TODO: Create default channel */
2359 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2360 goto error;
2361 }
2bdd86d4 2362
48842b30
DG
2363 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2364 if (uevent == NULL) {
2365 uevent = trace_ust_create_event(event);
2366 if (uevent == NULL) {
2bdd86d4
MD
2367 ret = LTTCOMM_FATAL;
2368 goto error;
2369 }
d5cd1f34 2370
48842b30 2371 }
2bdd86d4 2372
5b4a0ec0 2373 ret = ust_app_create_event_all(usess, uchan, uevent);
48842b30
DG
2374 if (ret < 0) {
2375 ret = LTTCOMM_UST_ENABLE_FAIL;
2376 goto error;
2bdd86d4 2377 }
487cf67c 2378
d5cd1f34 2379 /* Add ltt ust event to channel */
487cf67c
DG
2380 rcu_read_lock();
2381 hashtable_add_unique(uchan->events, &uevent->node);
2382 rcu_read_unlock();
d5cd1f34 2383
37357452
DG
2384 uevent->enabled = 1;
2385
d5cd1f34
DG
2386 DBG3("UST ltt event %s added to channel %s", uevent->attr.name,
2387 uchan->name);
2bdd86d4
MD
2388 break;
2389 }
2390 case LTTNG_DOMAIN_UST_EXEC_NAME:
2391 case LTTNG_DOMAIN_UST_PID:
2392 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2393 default:
54d01ffb
DG
2394 ret = LTTCOMM_NOT_IMPLEMENTED;
2395 goto error;
950131af 2396 }
d36b8583 2397
54d01ffb 2398 ret = LTTCOMM_OK;
d36b8583 2399
54d01ffb
DG
2400error:
2401 return ret;
2402}
7d29a247 2403
54d01ffb
DG
2404/*
2405 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2406 */
2407static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2408 char *channel_name, int event_type)
54d01ffb
DG
2409{
2410 int ret;
2411 struct ltt_kernel_channel *kchan;
7d29a247 2412
54d01ffb
DG
2413 switch (domain) {
2414 case LTTNG_DOMAIN_KERNEL:
2415 kchan = trace_kernel_get_channel_by_name(channel_name,
2416 session->kernel_session);
2417 if (kchan == NULL) {
2418 /* This call will notify the kernel thread */
44d3bd01
DG
2419 ret = channel_kernel_create(session->kernel_session, NULL,
2420 kernel_poll_pipe[1]);
54d01ffb
DG
2421 if (ret != LTTCOMM_OK) {
2422 goto error;
d36b8583 2423 }
54d01ffb 2424 }
0d0c377a 2425
54d01ffb
DG
2426 /* Get the newly created kernel channel pointer */
2427 kchan = trace_kernel_get_channel_by_name(channel_name,
2428 session->kernel_session);
2429 if (kchan == NULL) {
2430 /* This sould not happen... */
2431 ret = LTTCOMM_FATAL;
2432 goto error;
2433 }
0fdd1e2c 2434
7a3d1328
MD
2435 switch (event_type) {
2436 case LTTNG_KERNEL_SYSCALL:
2437 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2438 kchan, kernel_tracer_fd);
7a3d1328
MD
2439 break;
2440 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2441 /*
7a3d1328
MD
2442 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2443 * events already registered to the channel.
8c9ae521 2444 */
7a3d1328
MD
2445 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2446 kchan, kernel_tracer_fd);
2447 break;
2448 case LTTNG_KERNEL_ALL:
2449 /* Enable syscalls and tracepoints */
8c9ae521
DG
2450 ret = event_kernel_enable_all(session->kernel_session,
2451 kchan, kernel_tracer_fd);
7a3d1328
MD
2452 break;
2453 default:
2454 ret = LTTCOMM_KERN_ENABLE_FAIL;
2455 goto error;
8c9ae521 2456 }
54d01ffb 2457 if (ret != LTTCOMM_OK) {
0d0c377a 2458 goto error;
d36b8583
DG
2459 }
2460
54d01ffb 2461 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2462 break;
54d01ffb
DG
2463 default:
2464 /* TODO: Userspace tracing */
2465 ret = LTTCOMM_NOT_IMPLEMENTED;
2466 goto error;
d36b8583 2467 }
f3ed775e 2468
54d01ffb
DG
2469 ret = LTTCOMM_OK;
2470
2471error:
2472 return ret;
2473}
2474
2475/*
2476 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2477 */
2478static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2479{
2480 int ret;
2481 ssize_t nb_events = 0;
2482
2483 switch (domain) {
2484 case LTTNG_DOMAIN_KERNEL:
2485 nb_events = kernel_list_events(kernel_tracer_fd, events);
2486 if (nb_events < 0) {
2487 ret = LTTCOMM_KERN_LIST_FAIL;
2488 goto error;
894be886 2489 }
54d01ffb 2490 break;
b551a063
DG
2491 case LTTNG_DOMAIN_UST:
2492 nb_events = ust_app_list_events(events);
2493 if (nb_events < 0) {
2494 ret = LTTCOMM_UST_LIST_FAIL;
2495 goto error;
2496 }
2497 break;
54d01ffb 2498 default:
54d01ffb
DG
2499 ret = LTTCOMM_NOT_IMPLEMENTED;
2500 goto error;
2501 }
894be886 2502
54d01ffb 2503 return nb_events;
7d29a247 2504
54d01ffb
DG
2505error:
2506 /* Return negative value to differentiate return code */
2507 return -ret;
2508}
b389abbe 2509
54d01ffb
DG
2510/*
2511 * Command LTTNG_START_TRACE processed by the client thread.
2512 */
2513static int cmd_start_trace(struct ltt_session *session)
2514{
2515 int ret;
54d01ffb 2516 struct ltt_kernel_session *ksession;
b9d9b220 2517 struct ltt_ust_session *usess;
b389abbe 2518
54d01ffb
DG
2519 /* Short cut */
2520 ksession = session->kernel_session;
b9d9b220 2521 usess = session->ust_session;
5eb91c98 2522
464dd62d
MD
2523 if (session->enabled)
2524 return LTTCOMM_UST_START_FAIL;
2525 session->enabled = 1;
2526
54d01ffb
DG
2527 /* Kernel tracing */
2528 if (ksession != NULL) {
2bdd86d4
MD
2529 struct ltt_kernel_channel *kchan;
2530
54d01ffb
DG
2531 /* Open kernel metadata */
2532 if (ksession->metadata == NULL) {
2533 ret = kernel_open_metadata(ksession, ksession->trace_path);
2534 if (ret < 0) {
2535 ret = LTTCOMM_KERN_META_FAIL;
2536 goto error;
b389abbe 2537 }
54d01ffb 2538 }
7d29a247 2539
54d01ffb
DG
2540 /* Open kernel metadata stream */
2541 if (ksession->metadata_stream_fd == 0) {
2542 ret = kernel_open_metadata_stream(ksession);
2543 if (ret < 0) {
2544 ERR("Kernel create metadata stream failed");
2545 ret = LTTCOMM_KERN_STREAM_FAIL;
2546 goto error;
2547 }
2548 }
2549
2550 /* For each channel */
2551 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2552 if (kchan->stream_count == 0) {
2553 ret = kernel_open_channel_stream(kchan);
2554 if (ret < 0) {
2555 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2556 goto error;
2557 }
54d01ffb
DG
2558 /* Update the stream global counter */
2559 ksession->stream_count_global += ret;
7d29a247 2560 }
54d01ffb
DG
2561 }
2562
2563 /* Setup kernel consumer socket and send fds to it */
2564 ret = init_kernel_tracing(ksession);
2565 if (ret < 0) {
2566 ret = LTTCOMM_KERN_START_FAIL;
2567 goto error;
2568 }
2569
2570 /* This start the kernel tracing */
2571 ret = kernel_start_session(ksession);
2572 if (ret < 0) {
2573 ret = LTTCOMM_KERN_START_FAIL;
2574 goto error;
2575 }
2576
2577 /* Quiescent wait after starting trace */
2578 kernel_wait_quiescent(kernel_tracer_fd);
2579 }
2580
36dc12cc 2581 /* Flag session that trace should start automatically */
b9d9b220
DG
2582 if (usess) {
2583 usess->start_trace = 1;
36dc12cc 2584
b9d9b220
DG
2585 ret = ust_app_start_trace_all(usess);
2586 if (ret < 0) {
2587 ret = LTTCOMM_UST_START_FAIL;
2588 goto error;
2589 }
2bdd86d4 2590 }
54d01ffb
DG
2591
2592 ret = LTTCOMM_OK;
2593
2594error:
2595 return ret;
2596}
2597
2598/*
2599 * Command LTTNG_STOP_TRACE processed by the client thread.
2600 */
2601static int cmd_stop_trace(struct ltt_session *session)
2602{
2603 int ret;
2604 struct ltt_kernel_channel *kchan;
2605 struct ltt_kernel_session *ksession;
8be98f9a 2606 struct ltt_ust_session *usess;
54d01ffb
DG
2607
2608 /* Short cut */
2609 ksession = session->kernel_session;
8be98f9a 2610 usess = session->ust_session;
54d01ffb 2611
464dd62d
MD
2612 if (!session->enabled)
2613 return LTTCOMM_UST_START_FAIL;
2614 session->enabled = 0;
2615
54d01ffb
DG
2616 /* Kernel tracer */
2617 if (ksession != NULL) {
2618 DBG("Stop kernel tracing");
2619
2620 /* Flush all buffers before stopping */
2621 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2622 if (ret < 0) {
2623 ERR("Kernel metadata flush failed");
2624 }
f34daff7 2625
54d01ffb
DG
2626 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2627 ret = kernel_flush_buffer(kchan);
0d0c377a 2628 if (ret < 0) {
54d01ffb 2629 ERR("Kernel flush buffer error");
7d29a247 2630 }
54d01ffb 2631 }
19e70852 2632
54d01ffb
DG
2633 ret = kernel_stop_session(ksession);
2634 if (ret < 0) {
2635 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2636 goto error;
f3ed775e 2637 }
54d01ffb
DG
2638
2639 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2640 }
54d01ffb 2641
8be98f9a
MD
2642 /* Flag session that trace should start automatically */
2643 if (usess) {
2644 usess->start_trace = 0;
2bdd86d4 2645
8be98f9a 2646 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2647 if (ret < 0) {
8be98f9a 2648 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD
2649 goto error;
2650 }
2bdd86d4 2651 }
54d01ffb
DG
2652
2653 ret = LTTCOMM_OK;
2654
2655error:
2656 return ret;
2657}
2658
2659/*
2660 * Command LTTNG_CREATE_SESSION processed by the client thread.
2661 */
2662static int cmd_create_session(char *name, char *path)
2663{
2664 int ret;
2665
2666 ret = session_create(name, path);
2667 if (ret != LTTCOMM_OK) {
2668 goto error;
2669 }
2670
2671 ret = LTTCOMM_OK;
2672
2673error:
2674 return ret;
2675}
2676
2677/*
2678 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2679 */
2680static int cmd_destroy_session(struct ltt_session *session, char *name)
2681{
2682 int ret;
2683
2684 /* Clean kernel session teardown */
2685 teardown_kernel_session(session);
84cd17c6
MD
2686 /* UST session teardown */
2687 teardown_ust_session(session);
54d01ffb
DG
2688
2689 /*
2690 * Must notify the kernel thread here to update it's poll setin order
2691 * to remove the channel(s)' fd just destroyed.
2692 */
2693 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2694 if (ret < 0) {
2695 perror("write kernel poll pipe");
2696 }
2697
271933a4 2698 ret = session_destroy(session);
54d01ffb
DG
2699
2700 return ret;
2701}
2702
2703/*
2704 * Command LTTNG_CALIBRATE processed by the client thread.
2705 */
2706static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2707{
2708 int ret;
2709
2710 switch (domain) {
2711 case LTTNG_DOMAIN_KERNEL:
33a2b854 2712 {
54d01ffb 2713 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2714
54d01ffb
DG
2715 kcalibrate.type = calibrate->type;
2716 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2717 if (ret < 0) {
54d01ffb
DG
2718 ret = LTTCOMM_KERN_ENABLE_FAIL;
2719 goto error;
33a2b854 2720 }
54d01ffb
DG
2721 break;
2722 }
2723 default:
2724 /* TODO: Userspace tracing */
2725 ret = LTTCOMM_NOT_IMPLEMENTED;
2726 goto error;
2727 }
33a2b854 2728
54d01ffb 2729 ret = LTTCOMM_OK;
33a2b854 2730
54d01ffb
DG
2731error:
2732 return ret;
2733}
7d29a247 2734
54d01ffb
DG
2735/*
2736 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2737 */
2738static int cmd_register_consumer(struct ltt_session *session, int domain,
2739 char *sock_path)
2740{
2741 int ret, sock;
b389abbe 2742
54d01ffb
DG
2743 switch (domain) {
2744 case LTTNG_DOMAIN_KERNEL:
2745 /* Can't register a consumer if there is already one */
2746 if (session->kernel_session->consumer_fd != 0) {
2747 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2748 goto error;
2749 }
2750
2751 sock = lttcomm_connect_unix_sock(sock_path);
2752 if (sock < 0) {
2753 ret = LTTCOMM_CONNECT_FAIL;
2754 goto error;
2755 }
2756
2757 session->kernel_session->consumer_fd = sock;
2758 break;
2759 default:
2760 /* TODO: Userspace tracing */
2761 ret = LTTCOMM_NOT_IMPLEMENTED;
2762 goto error;
2763 }
2764
2765 ret = LTTCOMM_OK;
2766
2767error:
2768 return ret;
2769}
2770
2771/*
2772 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2773 */
2774static ssize_t cmd_list_domains(struct ltt_session *session,
2775 struct lttng_domain **domains)
2776{
b551a063 2777 int ret, index = 0;
54d01ffb
DG
2778 ssize_t nb_dom = 0;
2779
2780 if (session->kernel_session != NULL) {
b551a063 2781 DBG3("Listing domains found kernel domain");
54d01ffb
DG
2782 nb_dom++;
2783 }
2784
b551a063
DG
2785 if (session->ust_session != NULL) {
2786 DBG3("Listing domains found UST global domain");
2787 nb_dom++;
2788 }
54d01ffb 2789
b551a063 2790 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
2791 if (*domains == NULL) {
2792 ret = -LTTCOMM_FATAL;
2793 goto error;
2794 }
2795
b551a063
DG
2796 if (session->kernel_session != NULL) {
2797 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2798 index++;
2799 }
2800
2801 if (session->ust_session != NULL) {
2802 (*domains)[index].type = LTTNG_DOMAIN_UST;
2803 index++;
2804 }
54d01ffb 2805
54d01ffb
DG
2806 return nb_dom;
2807
2808error:
2809 return ret;
2810}
2811
2812/*
2813 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2814 */
b551a063 2815static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
2816 struct lttng_channel **channels)
2817{
2818 int ret;
2819 ssize_t nb_chan = 0;
2820
b551a063
DG
2821 switch (domain) {
2822 case LTTNG_DOMAIN_KERNEL:
2823 if (session->kernel_session != NULL) {
2824 nb_chan = session->kernel_session->channel_count;
2825 }
0df502fd 2826 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
2827 break;
2828 case LTTNG_DOMAIN_UST:
2829 if (session->ust_session != NULL) {
2830 nb_chan = hashtable_get_count(
2831 session->ust_session->domain_global.channels);
2832 }
0df502fd 2833 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
2834 break;
2835 default:
2836 *channels = NULL;
2837 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
2838 goto error;
2839 }
2840
b551a063
DG
2841 if (nb_chan > 0) {
2842 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2843 if (*channels == NULL) {
2844 ret = -LTTCOMM_FATAL;
2845 goto error;
2846 }
54d01ffb 2847
b551a063
DG
2848 list_lttng_channels(domain, session, *channels);
2849 } else {
2850 *channels = NULL;
2851 }
2bdd86d4 2852
54d01ffb
DG
2853 return nb_chan;
2854
2855error:
2856 return ret;
2857}
2858
2859/*
2860 * Command LTTNG_LIST_EVENTS processed by the client thread.
2861 */
b551a063 2862static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
2863 char *channel_name, struct lttng_event **events)
2864{
b551a063 2865 int ret = 0;
54d01ffb 2866 ssize_t nb_event = 0;
54d01ffb 2867
b551a063
DG
2868 switch (domain) {
2869 case LTTNG_DOMAIN_KERNEL:
2870 if (session->kernel_session != NULL) {
2871 nb_event = list_lttng_kernel_events(channel_name,
2872 session->kernel_session, events);
54d01ffb 2873 }
b551a063
DG
2874 break;
2875 case LTTNG_DOMAIN_UST:
2876 {
2877 if (session->ust_session != NULL) {
2878 nb_event = list_lttng_ust_global_events(channel_name,
2879 &session->ust_session->domain_global, events);
2880 }
2881 break;
54d01ffb 2882 }
b551a063
DG
2883 default:
2884 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG
2885 goto error;
2886 }
2887
b551a063 2888 ret = nb_event;
54d01ffb
DG
2889
2890error:
2891 return ret;
2892}
2893
2894/*
2895 * Process the command requested by the lttng client within the command
2896 * context structure. This function make sure that the return structure (llm)
2897 * is set and ready for transmission before returning.
2898 *
2899 * Return any error encountered or 0 for success.
2900 */
2901static int process_client_msg(struct command_ctx *cmd_ctx)
2902{
2903 int ret = LTTCOMM_OK;
44d3bd01 2904 int need_tracing_session = 1;
54d01ffb
DG
2905
2906 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2907
2908 /*
2909 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2910 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2911 * command.
2912 */
2913 switch(cmd_ctx->lsm->cmd_type) {
2914 case LTTNG_LIST_SESSIONS:
2915 case LTTNG_LIST_TRACEPOINTS:
2916 case LTTNG_LIST_DOMAINS:
2917 case LTTNG_LIST_CHANNELS:
2918 case LTTNG_LIST_EVENTS:
2919 break;
2920 default:
2921 /* Setup lttng message with no payload */
2922 ret = setup_lttng_msg(cmd_ctx, 0);
2923 if (ret < 0) {
2924 /* This label does not try to unlock the session */
2925 goto init_setup_error;
2926 }
2927 }
2928
2929 /* Commands that DO NOT need a session. */
2930 switch (cmd_ctx->lsm->cmd_type) {
2931 case LTTNG_CALIBRATE:
2932 case LTTNG_CREATE_SESSION:
2933 case LTTNG_LIST_SESSIONS:
2934 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2935 need_tracing_session = 0;
54d01ffb
DG
2936 break;
2937 default:
2938 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 2939 session_lock_list();
54d01ffb 2940 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 2941 session_unlock_list();
54d01ffb
DG
2942 if (cmd_ctx->session == NULL) {
2943 if (cmd_ctx->lsm->session.name != NULL) {
2944 ret = LTTCOMM_SESS_NOT_FOUND;
2945 } else {
2946 /* If no session name specified */
2947 ret = LTTCOMM_SELECT_SESS;
2948 }
2949 goto error;
2950 } else {
2951 /* Acquire lock for the session */
2952 session_lock(cmd_ctx->session);
2953 }
2954 break;
2955 }
b389abbe 2956
54d01ffb
DG
2957 /*
2958 * Check domain type for specific "pre-action".
2959 */
2960 switch (cmd_ctx->lsm->domain.type) {
2961 case LTTNG_DOMAIN_KERNEL:
2962 /* Kernel tracer check */
2963 if (kernel_tracer_fd == 0) {
2964 /* Basically, load kernel tracer modules */
2965 init_kernel_tracer();
2966 if (kernel_tracer_fd == 0) {
2967 ret = LTTCOMM_KERN_NA;
2968 goto error;
2969 }
2970 }
5eb91c98 2971
54d01ffb 2972 /* Need a session for kernel command */
44d3bd01 2973 if (need_tracing_session) {
54d01ffb
DG
2974 if (cmd_ctx->session->kernel_session == NULL) {
2975 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2976 if (ret < 0) {
54d01ffb 2977 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
2978 goto error;
2979 }
b389abbe 2980 }
7d29a247 2981
54d01ffb 2982 /* Start the kernel consumer daemon */
3bd1e081
MD
2983 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2984 if (kconsumer_data.pid == 0 &&
54d01ffb 2985 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
2986 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2987 ret = start_consumerd(&kconsumer_data);
7d29a247 2988 if (ret < 0) {
54d01ffb
DG
2989 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2990 goto error;
950131af 2991 }
33a2b854 2992 }
3bd1e081 2993 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
0d0c377a 2994 }
54d01ffb 2995 break;
2bdd86d4 2996 case LTTNG_DOMAIN_UST:
44d3bd01 2997 {
44d3bd01 2998 if (need_tracing_session) {
f6a9efaa 2999 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG
3000 ret = create_ust_session(cmd_ctx->session,
3001 &cmd_ctx->lsm->domain);
3002 if (ret != LTTCOMM_OK) {
3003 goto error;
3004 }
3005 }
2bdd86d4
MD
3006 /* Start the kernel consumer daemon */
3007 pthread_mutex_lock(&ustconsumer_data.pid_mutex);
3008 if (ustconsumer_data.pid == 0 &&
3009 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3010 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
3011 ret = start_consumerd(&ustconsumer_data);
3012 if (ret < 0) {
3013 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3014 goto error;
3015 }
48842b30 3016
ba5d816e 3017 ust_consumer_fd = ustconsumer_data.cmd_sock;
2bdd86d4
MD
3018 }
3019 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
44d3bd01
DG
3020 }
3021 break;
48842b30 3022 }
54d01ffb 3023 default:
54d01ffb
DG
3024 break;
3025 }
33a2b854 3026
54d01ffb
DG
3027 /* Process by command type */
3028 switch (cmd_ctx->lsm->cmd_type) {
3029 case LTTNG_ADD_CONTEXT:
3030 {
3031 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3032 cmd_ctx->lsm->u.context.channel_name,
3033 cmd_ctx->lsm->u.context.event_name,
3034 &cmd_ctx->lsm->u.context.ctx);
3035 break;
3036 }
3037 case LTTNG_DISABLE_CHANNEL:
3038 {
3039 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3040 cmd_ctx->lsm->u.disable.channel_name);
3041 break;
3042 }
3043 case LTTNG_DISABLE_EVENT:
3044 {
3045 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3046 cmd_ctx->lsm->u.disable.channel_name,
3047 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
3048 ret = LTTCOMM_OK;
3049 break;
3050 }
54d01ffb
DG
3051 case LTTNG_DISABLE_ALL_EVENT:
3052 {
2bdd86d4 3053 DBG("Disabling all events");
54d01ffb
DG
3054
3055 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3056 cmd_ctx->lsm->u.disable.channel_name);
3057 break;
3058 }
3059 case LTTNG_ENABLE_CHANNEL:
3060 {
44d3bd01 3061 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG
3062 &cmd_ctx->lsm->u.channel.chan);
3063 break;
3064 }
3065 case LTTNG_ENABLE_EVENT:
3066 {
3067 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3068 cmd_ctx->lsm->u.enable.channel_name,
3069 &cmd_ctx->lsm->u.enable.event);
3070 break;
3071 }
3072 case LTTNG_ENABLE_ALL_EVENT:
3073 {
2bdd86d4 3074 DBG("Enabling all events");
54d01ffb
DG
3075
3076 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
3077 cmd_ctx->lsm->u.enable.channel_name,
3078 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
3079 break;
3080 }
052da939 3081 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3082 {
9f19cc17 3083 struct lttng_event *events;
54d01ffb 3084 ssize_t nb_events;
052da939 3085
54d01ffb
DG
3086 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3087 if (nb_events < 0) {
3088 ret = -nb_events;
3089 goto error;
2ef84c95
DG
3090 }
3091
3092 /*
3093 * Setup lttng message with payload size set to the event list size in
3094 * bytes and then copy list into the llm payload.
3095 */
052da939 3096 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3097 if (ret < 0) {
052da939 3098 free(events);
2ef84c95
DG
3099 goto setup_error;
3100 }
3101
3102 /* Copy event list into message payload */
9f19cc17 3103 memcpy(cmd_ctx->llm->payload, events,
052da939 3104 sizeof(struct lttng_event) * nb_events);
2ef84c95 3105
9f19cc17 3106 free(events);
2ef84c95
DG
3107
3108 ret = LTTCOMM_OK;
3109 break;
3110 }
f3ed775e 3111 case LTTNG_START_TRACE:
8c0faa1d 3112 {
54d01ffb 3113 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
3114 break;
3115 }
f3ed775e 3116 case LTTNG_STOP_TRACE:
8c0faa1d 3117 {
54d01ffb 3118 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
3119 break;
3120 }
5e16da05
MD
3121 case LTTNG_CREATE_SESSION:
3122 {
54d01ffb
DG
3123 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3124 cmd_ctx->lsm->session.path);
5e16da05
MD
3125 break;
3126 }
3127 case LTTNG_DESTROY_SESSION:
3128 {
54d01ffb
DG
3129 ret = cmd_destroy_session(cmd_ctx->session,
3130 cmd_ctx->lsm->session.name);
5461b305 3131 break;
5e16da05 3132 }
9f19cc17 3133 case LTTNG_LIST_DOMAINS:
5e16da05 3134 {
54d01ffb
DG
3135 ssize_t nb_dom;
3136 struct lttng_domain *domains;
5461b305 3137
54d01ffb
DG
3138 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3139 if (nb_dom < 0) {
3140 ret = -nb_dom;
3141 goto error;
ce3d728c 3142 }
520ff687 3143
54d01ffb 3144 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
3145 if (ret < 0) {
3146 goto setup_error;
520ff687 3147 }
57167058 3148
54d01ffb
DG
3149 /* Copy event list into message payload */
3150 memcpy(cmd_ctx->llm->payload, domains,
3151 nb_dom * sizeof(struct lttng_domain));
3152
3153 free(domains);
5e16da05 3154
5461b305 3155 ret = LTTCOMM_OK;
5e16da05
MD
3156 break;
3157 }
9f19cc17 3158 case LTTNG_LIST_CHANNELS:
5e16da05 3159 {
54d01ffb
DG
3160 size_t nb_chan;
3161 struct lttng_channel *channels;
3162
b551a063
DG
3163 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3164 cmd_ctx->session, &channels);
54d01ffb
DG
3165 if (nb_chan < 0) {
3166 ret = -nb_chan;
3167 goto error;
5461b305 3168 }
ca95a216 3169
54d01ffb 3170 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
3171 if (ret < 0) {
3172 goto setup_error;
3173 }
9f19cc17 3174
54d01ffb
DG
3175 /* Copy event list into message payload */
3176 memcpy(cmd_ctx->llm->payload, channels,
3177 nb_chan * sizeof(struct lttng_channel));
3178
3179 free(channels);
9f19cc17
DG
3180
3181 ret = LTTCOMM_OK;
5461b305 3182 break;
5e16da05 3183 }
9f19cc17 3184 case LTTNG_LIST_EVENTS:
5e16da05 3185 {
b551a063 3186 ssize_t nb_event;
684d34d2 3187 struct lttng_event *events = NULL;
9f19cc17 3188
b551a063 3189 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
3190 cmd_ctx->lsm->u.list.channel_name, &events);
3191 if (nb_event < 0) {
3192 ret = -nb_event;
3193 goto error;
5461b305 3194 }
ca95a216 3195
54d01ffb 3196 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
3197 if (ret < 0) {
3198 goto setup_error;
3199 }
9f19cc17 3200
54d01ffb
DG
3201 /* Copy event list into message payload */
3202 memcpy(cmd_ctx->llm->payload, events,
3203 nb_event * sizeof(struct lttng_event));
9f19cc17 3204
54d01ffb 3205 free(events);
9f19cc17
DG
3206
3207 ret = LTTCOMM_OK;
5461b305 3208 break;
5e16da05
MD
3209 }
3210 case LTTNG_LIST_SESSIONS:
3211 {
54d01ffb 3212 session_lock_list();
5461b305 3213
6c9cc2ab 3214 if (session_list_ptr->count == 0) {
f3ed775e 3215 ret = LTTCOMM_NO_SESSION;
54d01ffb 3216 session_unlock_list();
5461b305 3217 goto error;
57167058 3218 }
5e16da05 3219
6c9cc2ab
DG
3220 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3221 session_list_ptr->count);
5461b305 3222 if (ret < 0) {
54d01ffb 3223 session_unlock_list();
5461b305 3224 goto setup_error;
e065084a 3225 }
5e16da05 3226
6c9cc2ab
DG
3227 /* Filled the session array */
3228 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3229
54d01ffb 3230 session_unlock_list();
5e16da05 3231
5461b305 3232 ret = LTTCOMM_OK;
5e16da05
MD
3233 break;
3234 }
d0254c7c
MD
3235 case LTTNG_CALIBRATE:
3236 {
54d01ffb
DG
3237 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3238 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
3239 break;
3240 }
d9800920
DG
3241 case LTTNG_REGISTER_CONSUMER:
3242 {
54d01ffb
DG
3243 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3244 cmd_ctx->lsm->u.reg.path);
d9800920
DG
3245 break;
3246 }
5e16da05 3247 default:
5e16da05 3248 ret = LTTCOMM_UND;
5461b305 3249 break;
fac6795d
DG
3250 }
3251
5461b305 3252error:
5461b305
DG
3253 if (cmd_ctx->llm == NULL) {
3254 DBG("Missing llm structure. Allocating one.");
894be886 3255 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
3256 goto setup_error;
3257 }
3258 }
54d01ffb 3259 /* Set return code */
5461b305 3260 cmd_ctx->llm->ret_code = ret;
5461b305 3261setup_error:
b5541356 3262 if (cmd_ctx->session) {
54d01ffb 3263 session_unlock(cmd_ctx->session);
b5541356 3264 }
54d01ffb 3265init_setup_error:
8028d920 3266 return ret;
fac6795d
DG
3267}
3268
1d4b027a 3269/*
d063d709
DG
3270 * This thread manage all clients request using the unix client socket for
3271 * communication.
1d4b027a
DG
3272 */
3273static void *thread_manage_clients(void *data)
3274{
5eb91c98
DG
3275 int sock = 0, ret, i, pollfd;
3276 uint32_t revents, nb_fd;
273ea72c 3277 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3278 struct lttng_poll_event events;
1d4b027a
DG
3279
3280 DBG("[thread] Manage client started");
3281
f6a9efaa
DG
3282 rcu_register_thread();
3283
1d4b027a
DG
3284 ret = lttcomm_listen_unix_sock(client_sock);
3285 if (ret < 0) {
3286 goto error;
3287 }
3288
5eb91c98
DG
3289 /*
3290 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3291 * more will be added to this poll set.
3292 */
3293 ret = create_thread_poll_set(&events, 2);
3294 if (ret < 0) {
3295 goto error;
3296 }
273ea72c 3297
5eb91c98
DG
3298 /* Add the application registration socket */
3299 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3300 if (ret < 0) {
3301 goto error;
3302 }
273ea72c 3303
bbd973c2
DG
3304 /*
3305 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
3306 */
3307 if (opt_sig_parent) {
3308 kill(ppid, SIGCHLD);
3309 }
3310
3311 while (1) {
1d4b027a 3312 DBG("Accepting client command ...");
273ea72c 3313
5eb91c98
DG
3314 nb_fd = LTTNG_POLL_GETNB(&events);
3315
273ea72c 3316 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3317 ret = lttng_poll_wait(&events, -1);
273ea72c 3318 if (ret < 0) {
273ea72c
DG
3319 goto error;
3320 }
3321
5eb91c98
DG
3322 for (i = 0; i < nb_fd; i++) {
3323 /* Fetch once the poll data */
3324 revents = LTTNG_POLL_GETEV(&events, i);
3325 pollfd = LTTNG_POLL_GETFD(&events, i);
3326