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Implement UST destroy session
[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);
5eb91c98
DG		 1063 if (ret < 0) {
1064 /* Only critical ENOMEM error can be returned here */
1065 goto error;
1066 }
1067
acc7b41b
MD		 1068 /*
1069 * Add channel(s) and event(s) to newly registered apps
1070 * from lttng global UST domain.
1071 */
1072 update_ust_app(ust_cmd.sock);
1073
5eb91c98
DG		 1074 ret = ustctl_register_done(ust_cmd.sock);
1075 if (ret < 0) {
1076 /*
1077 * If the registration is not possible, we simply
1078 * unregister the apps and continue
1079 */
56fff090 1080 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1081 } else {
1082 /*
1083 * We just need here to monitor the close of the UST
1084 * socket and poll set monitor those by default.
1085 */
1086 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1087 if (ret < 0) {
1088 goto error;
1089 }
1090
54d01ffb
DG		 1091 DBG("Apps with sock %d added to poll set",
1092 ust_cmd.sock);
5eb91c98 1093 }
487cf67c 1094
5eb91c98 1095 break;
0177d773 1096 }
5eb91c98
DG		 1097 } else {
1098 /*
54d01ffb
DG		 1099 * At this point, we know that a registered application made
1100 * the event at poll_wait.
5eb91c98
DG		 1101 */
1102 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1103 /* Removing from the poll set */
1104 ret = lttng_poll_del(&events, pollfd);
1105 if (ret < 0) {
1106 goto error;
1107 }
099e26bd 1108
b9d9b220 1109 /* Socket closed on remote end. */
56fff090 1110 ust_app_unregister(pollfd);
5eb91c98
DG		 1111 break;
1112 }
099e26bd
DG		 1113 }
1114 }
099e26bd
DG		 1115 }
1116
1117error:
1118 DBG("Application communication apps dying");
1119 close(apps_cmd_pipe[0]);
1120 close(apps_cmd_pipe[1]);
1121
5eb91c98 1122 lttng_poll_clean(&events);
099e26bd 1123
f6a9efaa
DG		 1124 rcu_thread_offline();
1125 rcu_unregister_thread();
099e26bd
DG		 1126 return NULL;
1127}
1128
1129/*
1130 * Dispatch request from the registration threads to the application
1131 * communication thread.
1132 */
1133static void *thread_dispatch_ust_registration(void *data)
1134{
1135 int ret;
1136 struct cds_wfq_node *node;
1137 struct ust_command *ust_cmd = NULL;
1138
1139 DBG("[thread] Dispatch UST command started");
1140
1141 while (!dispatch_thread_exit) {
1142 /* Atomically prepare the queue futex */
1143 futex_nto1_prepare(&ust_cmd_queue.futex);
1144
1145 do {
1146 /* Dequeue command for registration */
1147 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1148 if (node == NULL) {
00a17c97 1149 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1150 /* Continue thread execution */
1151 break;
1152 }
1153
1154 ust_cmd = caa_container_of(node, struct ust_command, node);
1155
2f50c8a3
DG		 1156 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1157 " gid:%d sock:%d name:%s (version %d.%d)",
1158 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1159 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1160 ust_cmd->sock, ust_cmd->reg_msg.name,
1161 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1162 /*
1163 * Inform apps thread of the new application registration. This
1164 * call is blocking so we can be assured that the data will be read
1165 * at some point in time or wait to the end of the world :)
1166 */
1167 ret = write(apps_cmd_pipe[1], ust_cmd,
1168 sizeof(struct ust_command));
1169 if (ret < 0) {
1170 perror("write apps cmd pipe");
1171 if (errno == EBADF) {
1172 /*
1173 * We can't inform the application thread to process
1174 * registration. We will exit or else application
1175 * registration will not occur and tracing will never
1176 * start.
1177 */
1178 goto error;
1179 }
1180 }
1181 free(ust_cmd);
1182 } while (node != NULL);
1183
1184 /* Futex wait on queue. Blocking call on futex() */
1185 futex_nto1_wait(&ust_cmd_queue.futex);
1186 }
1187
1188error:
1189 DBG("Dispatch thread dying");
1190 return NULL;
1191}
1192
1193/*
1194 * This thread manage application registration.
1195 */
1196static void *thread_registration_apps(void *data)
1d4b027a 1197{
5eb91c98
DG		 1198 int sock = 0, i, ret, pollfd;
1199 uint32_t revents, nb_fd;
1200 struct lttng_poll_event events;
099e26bd
DG		 1201 /*
1202 * Get allocated in this thread, enqueued to a global queue, dequeued and
1203 * freed in the manage apps thread.
1204 */
1205 struct ust_command *ust_cmd = NULL;
1d4b027a 1206
099e26bd 1207 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1208
1209 ret = lttcomm_listen_unix_sock(apps_sock);
1210 if (ret < 0) {
1211 goto error;
1212 }
1213
5eb91c98
DG		 1214 /*
1215 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1216 * more will be added to this poll set.
1217 */
1218 ret = create_thread_poll_set(&events, 2);
1219 if (ret < 0) {
1220 goto error;
1221 }
273ea72c 1222
5eb91c98
DG		 1223 /* Add the application registration socket */
1224 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1225 if (ret < 0) {
1226 goto error;
1227 }
273ea72c 1228
1d4b027a 1229 /* Notify all applications to register */
0fdd1e2c
DG		 1230 ret = notify_ust_apps(1);
1231 if (ret < 0) {
1232 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1233 "Execution continues but there might be problem for already\n"
1234 "running applications that wishes to register.");
0fdd1e2c 1235 }
1d4b027a
DG		 1236
1237 while (1) {
1238 DBG("Accepting application registration");
273ea72c 1239
5eb91c98
DG		 1240 nb_fd = LTTNG_POLL_GETNB(&events);
1241
273ea72c 1242 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1243 ret = lttng_poll_wait(&events, -1);
273ea72c 1244 if (ret < 0) {
273ea72c
DG		 1245 goto error;
1246 }
1247
5eb91c98
DG		 1248 for (i = 0; i < nb_fd; i++) {
1249 /* Fetch once the poll data */
1250 revents = LTTNG_POLL_GETEV(&events, i);
1251 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1252
5eb91c98
DG		 1253 /* Thread quit pipe has been closed. Killing thread. */
1254 ret = check_thread_quit_pipe(pollfd, revents);
1255 if (ret) {
90014c57
DG		 1256 goto error;
1257 }
1d4b027a 1258
5eb91c98
DG		 1259 /* Event on the registration socket */
1260 if (pollfd == apps_sock) {
1261 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1262 ERR("Register apps socket poll error");
1263 goto error;
1264 } else if (revents & LPOLLIN) {
1265 sock = lttcomm_accept_unix_sock(apps_sock);
1266 if (sock < 0) {
1267 goto error;
1268 }
099e26bd 1269
5eb91c98 1270 /* Create UST registration command for enqueuing */
ba7f0ae5 1271 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1272 if (ust_cmd == NULL) {
ba7f0ae5 1273 perror("ust command zmalloc");
5eb91c98
DG		 1274 goto error;
1275 }
1d4b027a 1276
5eb91c98
DG		 1277 /*
1278 * Using message-based transmissions to ensure we don't
1279 * have to deal with partially received messages.
1280 */
1281 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1282 sizeof(struct ust_register_msg));
1283 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1284 if (ret < 0) {
1285 perror("lttcomm_recv_unix_sock register apps");
1286 } else {
1287 ERR("Wrong size received on apps register");
1288 }
1289 free(ust_cmd);
1290 close(sock);
1291 continue;
1292 }
099e26bd 1293
5eb91c98 1294 ust_cmd->sock = sock;
099e26bd 1295
5eb91c98
DG		 1296 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1297 " gid:%d sock:%d name:%s (version %d.%d)",
1298 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1299 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1300 ust_cmd->sock, ust_cmd->reg_msg.name,
1301 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1302
5eb91c98
DG		 1303 /*
1304 * Lock free enqueue the registration request. The red pill
54d01ffb 1305 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1306 */
1307 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1308
1309 /*
1310 * Wake the registration queue futex. Implicit memory
1311 * barrier with the exchange in cds_wfq_enqueue.
1312 */
1313 futex_nto1_wake(&ust_cmd_queue.futex);
1314 }
1315 }
90014c57 1316 }
1d4b027a
DG		 1317 }
1318
1319error:
0fdd1e2c
DG		 1320 DBG("UST Registration thread dying");
1321
1322 /* Notify that the registration thread is gone */
1323 notify_ust_apps(0);
1324
1325 close(apps_sock);
1326 close(sock);
273ea72c 1327 unlink(apps_unix_sock_path);
0fdd1e2c 1328
5eb91c98
DG		 1329 lttng_poll_clean(&events);
1330
1d4b027a
DG		 1331 return NULL;
1332}
1333
8c0faa1d 1334/*
3bd1e081 1335 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1336 * exec or it will fails.
8c0faa1d 1337 */
3bd1e081 1338static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1339{
1340 int ret;
ee0b0061
DG		 1341 struct timespec timeout;
1342
1343 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1344 timeout.tv_nsec = 0;
8c0faa1d
DG		 1345
1346 /* Setup semaphore */
3bd1e081 1347 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1348 if (ret < 0) {
3bd1e081 1349 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1350 goto error;
1351 }
8c0faa1d 1352
3bd1e081
MD		 1353 ret = pthread_create(&consumer_data->thread, NULL,
1354 thread_manage_consumer, consumer_data);
8c0faa1d 1355 if (ret != 0) {
3bd1e081 1356 PERROR("pthread_create consumer");
ee0b0061 1357 ret = -1;
8c0faa1d
DG		 1358 goto error;
1359 }
1360
ee0b0061
DG		 1361 /* Get time for sem_timedwait absolute timeout */
1362 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1363 if (ret < 0) {
3bd1e081 1364 PERROR("clock_gettime spawn consumer");
ee0b0061 1365 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1366 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1367 } else {
1368 /* Normal timeout if the gettime was successful */
1369 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1370 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1371 }
8c0faa1d 1372
ee0b0061
DG		 1373 if (ret < 0) {
1374 if (errno == ETIMEDOUT) {
1375 /*
1376 * Call has timed out so we kill the kconsumerd_thread and return
1377 * an error.
1378 */
3bd1e081
MD		 1379 ERR("The consumer thread was never ready. Killing it");
1380 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1381 if (ret < 0) {
3bd1e081 1382 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1383 }
1384 } else {
3bd1e081 1385 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1386 }
1387 goto error;
1388 }
1389
3bd1e081
MD		 1390 pthread_mutex_lock(&consumer_data->pid_mutex);
1391 if (consumer_data->pid == 0) {
712ea556 1392 ERR("Kconsumerd did not start");
3bd1e081 1393 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1394 goto error;
1395 }
3bd1e081 1396 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1397
8c0faa1d
DG		 1398 return 0;
1399
1400error:
1401 return ret;
1402}
1403
d9800920 1404/*
3bd1e081 1405 * Join consumer thread
d9800920 1406 */
3bd1e081 1407static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1408{
1409 void *status;
1410 int ret;
1411
3bd1e081
MD		 1412 if (consumer_data->pid != 0) {
1413 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1414 if (ret) {
3bd1e081 1415 ERR("Error killing consumer daemon");
cf3af59e
MD		 1416 return ret;
1417 }
3bd1e081 1418 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1419 } else {
1420 return 0;
1421 }
1422}
1423
8c0faa1d 1424/*
3bd1e081 1425 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1426 *
d063d709 1427 * Return pid if successful else -1.
8c0faa1d 1428 */
3bd1e081 1429static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1430{
1431 int ret;
1432 pid_t pid;
53086306 1433 const char *verbosity;
8c0faa1d 1434
3bd1e081 1435 DBG("Spawning consumerd");
c49dc785 1436
8c0faa1d
DG		 1437 pid = fork();
1438 if (pid == 0) {
1439 /*
3bd1e081 1440 * Exec consumerd.
8c0faa1d 1441 */
3bd1e081 1442 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG		 1443 verbosity = "--verbose";
1444 } else {
1445 verbosity = "--quiet";
1446 }
3bd1e081
MD		 1447 switch (consumer_data->type) {
1448 case LTTNG_CONSUMER_KERNEL:
1449 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1450 "lttng-consumerd", verbosity, "-k", NULL);
1451 break;
1452 case LTTNG_CONSUMER_UST:
1453 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1454 "lttng-consumerd", verbosity, "-u", NULL);
1455 break;
1456 default:
1457 perror("unknown consumer type");
1458 exit(EXIT_FAILURE);
1459 }
8c0faa1d
DG		 1460 if (errno != 0) {
1461 perror("kernel start consumer exec");
1462 }
1463 exit(EXIT_FAILURE);
1464 } else if (pid > 0) {
1465 ret = pid;
8c0faa1d 1466 } else {
3bd1e081 1467 perror("start consumer fork");
8c0faa1d 1468 ret = -errno;
8c0faa1d 1469 }
8c0faa1d
DG		 1470 return ret;
1471}
1472
693bd40b 1473/*
3bd1e081 1474 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1475 */
3bd1e081 1476static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1477{
1478 int ret;
1479
3bd1e081
MD		 1480 pthread_mutex_lock(&consumer_data->pid_mutex);
1481 if (consumer_data->pid != 0) {
1482 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1483 goto end;
1484 }
693bd40b 1485
3bd1e081 1486 ret = spawn_consumerd(consumer_data);
c49dc785 1487 if (ret < 0) {
3bd1e081
MD		 1488 ERR("Spawning consumerd failed");
1489 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1490 goto error;
693bd40b 1491 }
c49dc785 1492
3bd1e081
MD		 1493 /* Setting up the consumer_data pid */
1494 consumer_data->pid = ret;
48842b30 1495 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1496 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1497
3bd1e081
MD		 1498 DBG2("Spawning consumer control thread");
1499 ret = spawn_consumer_thread(consumer_data);
693bd40b 1500 if (ret < 0) {
3bd1e081 1501 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1502 goto error;
1503 }
1504
c49dc785 1505end:
693bd40b
DG		 1506 return 0;
1507
1508error:
1509 return ret;
1510}
1511
b73401da 1512/*
d063d709 1513 * modprobe_kernel_modules
b73401da
DG		 1514 */
1515static int modprobe_kernel_modules(void)
1516{
ab147185 1517 int ret = 0, i;
b73401da
DG		 1518 char modprobe[256];
1519
ab147185
MD		 1520 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1521 ret = snprintf(modprobe, sizeof(modprobe),
1522 "/sbin/modprobe %s%s",
24b487b8 1523 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1524 kernel_modules_list[i].name);
b73401da
DG		 1525 if (ret < 0) {
1526 perror("snprintf modprobe");
1527 goto error;
1528 }
ab147185 1529 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1530 ret = system(modprobe);
ab147185
MD		 1531 if (ret == -1) {
1532 ERR("Unable to launch modprobe for module %s",
1533 kernel_modules_list[i].name);
1534 } else if (kernel_modules_list[i].required
d9800920 1535 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1536 ERR("Unable to load module %s",
1537 kernel_modules_list[i].name);
1538 } else {
1539 DBG("Modprobe successfully %s",
1540 kernel_modules_list[i].name);
1541 }
1542 }
1543
1544error:
1545 return ret;
1546}
1547
b73401da 1548/*
d063d709 1549 * mount_debugfs
b73401da
DG		 1550 */
1551static int mount_debugfs(char *path)
1552{
1553 int ret;
1554 char *type = "debugfs";
1555
996b65c8 1556 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1557 if (ret < 0) {
7272acf5 1558 PERROR("Cannot create debugfs path");
b73401da
DG		 1559 goto error;
1560 }
1561
1562 ret = mount(type, path, type, 0, NULL);
1563 if (ret < 0) {
7272acf5 1564 PERROR("Cannot mount debugfs");
b73401da
DG		 1565 goto error;
1566 }
1567
1568 DBG("Mounted debugfs successfully at %s", path);
1569
1570error:
1571 return ret;
1572}
1573
8c0faa1d 1574/*
d063d709 1575 * Setup necessary data for kernel tracer action.
8c0faa1d 1576 */
f3ed775e 1577static void init_kernel_tracer(void)
8c0faa1d 1578{
b73401da
DG		 1579 int ret;
1580 char *proc_mounts = "/proc/mounts";
1581 char line[256];
684d34d2 1582 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1583 FILE *fp;
1584
1585 /* Detect debugfs */
1586 fp = fopen(proc_mounts, "r");
1587 if (fp == NULL) {
1588 ERR("Unable to probe %s", proc_mounts);
1589 goto error;
1590 }
1591
1592 while (fgets(line, sizeof(line), fp) != NULL) {
1593 if (strstr(line, "debugfs") != NULL) {
1594 /* Remove first string */
1595 strtok(line, " ");
1596 /* Dup string here so we can reuse line later on */
1597 debugfs_path = strdup(strtok(NULL, " "));
1598 DBG("Got debugfs path : %s", debugfs_path);
1599 break;
1600 }
1601 }
1602
1603 fclose(fp);
1604
1605 /* Mount debugfs if needded */
1606 if (debugfs_path == NULL) {
1607 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1608 if (ret < 0) {
1609 perror("asprintf debugfs path");
1610 goto error;
1611 }
1612 ret = mount_debugfs(debugfs_path);
1613 if (ret < 0) {
7272acf5 1614 perror("Cannot mount debugfs");
b73401da
DG		 1615 goto error;
1616 }
1617 }
1618
1619 /* Modprobe lttng kernel modules */
1620 ret = modprobe_kernel_modules();
1621 if (ret < 0) {
1622 goto error;
1623 }
1624
1625 /* Setup lttng kernel path */
1626 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1627 if (ret < 0) {
1628 perror("asprintf lttng path");
1629 goto error;
1630 }
1631
1632 /* Open debugfs lttng */
1633 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1634 if (kernel_tracer_fd < 0) {
b73401da
DG		 1635 DBG("Failed to open %s", lttng_path);
1636 goto error;
8c0faa1d
DG		 1637 }
1638
b73401da
DG		 1639 free(lttng_path);
1640 free(debugfs_path);
f3ed775e 1641 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1642 return;
1643
1644error:
1645 if (lttng_path) {
1646 free(lttng_path);
1647 }
1648 if (debugfs_path) {
1649 free(debugfs_path);
1650 }
1651 WARN("No kernel tracer available");
1652 kernel_tracer_fd = 0;
1653 return;
f3ed775e 1654}
33a2b854 1655
f3ed775e 1656/*
54d01ffb 1657 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1658 */
54d01ffb 1659static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1660{
f40799e8 1661 int ret = 0;
8c0faa1d 1662
3bd1e081 1663 if (session->consumer_fds_sent == 0) {
d9800920 1664 /*
54d01ffb
DG		 1665 * Assign default kernel consumer socket if no consumer assigned to the
1666 * kernel session. At this point, it's NOT suppose to be 0 but this is
1667 * an extra security check.
d9800920
DG		 1668 */
1669 if (session->consumer_fd == 0) {
3bd1e081 1670 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1671 }
1672
2bdd86d4 1673 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1674 if (ret < 0) {
f3ed775e
DG		 1675 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1676 goto error;
1677 }
1d4b027a 1678
3bd1e081 1679 session->consumer_fds_sent = 1;
f3ed775e 1680 }
1d4b027a
DG		 1681
1682error:
1683 return ret;
8c0faa1d
DG		 1684}
1685
0177d773
DG		 1686/*
1687 * Create an UST session and add it to the session ust list.
1688 */
44d3bd01
DG		 1689static int create_ust_session(struct ltt_session *session,
1690 struct lttng_domain *domain)
0177d773 1691{
44d3bd01 1692 int ret;
48842b30 1693 unsigned int uid;
13384287 1694 struct ltt_ust_session *lus = NULL;
44d3bd01
DG		 1695
1696 switch (domain->type) {
48842b30 1697 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1698 break;
1699 default:
13384287 1700 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1701 goto error;
1702 }
0177d773
DG		 1703
1704 DBG("Creating UST session");
1705
48842b30
DG		 1706 session_lock_list();
1707 uid = session_list_ptr->count;
1708 session_unlock_list();
1709
1710 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1711 if (lus == NULL) {
44d3bd01 1712 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1713 goto error;
1714 }
1715
48842b30 1716 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG		 1717 geteuid(), allowed_group());
1718 if (ret < 0) {
1719 if (ret != -EEXIST) {
1720 ERR("Trace directory creation error");
44d3bd01 1721 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1722 goto error;
1723 }
1724 }
1725
f6a9efaa
DG		 1726 /* The domain type dictate different actions on session creation */
1727 switch (domain->type) {
48842b30
DG		 1728 case LTTNG_DOMAIN_UST:
1729 /* No ustctl for the global UST domain */
1730 break;
1731 default:
36dc12cc 1732 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1733 goto error;
0177d773 1734 }
f6a9efaa 1735 session->ust_session = lus;
44d3bd01
DG		 1736
1737 return LTTCOMM_OK;
0177d773
DG		 1738
1739error:
1740 free(lus);
1741 return ret;
1742}
1743
333f285e 1744/*
d063d709 1745 * Create a kernel tracer session then create the default channel.
333f285e 1746 */
f3ed775e 1747static int create_kernel_session(struct ltt_session *session)
333f285e 1748{
f3ed775e 1749 int ret;
f3ed775e
DG		 1750
1751 DBG("Creating kernel session");
1752
1753 ret = kernel_create_session(session, kernel_tracer_fd);
1754 if (ret < 0) {
1755 ret = LTTCOMM_KERN_SESS_FAIL;
1756 goto error;
333f285e
DG		 1757 }
1758
d9800920 1759 /* Set kernel consumer socket fd */
3bd1e081
MD		 1760 if (kconsumer_data.cmd_sock) {
1761 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1762 }
1763
63053e7c
DG		 1764 ret = mkdir_recursive(session->kernel_session->trace_path,
1765 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1766 if (ret < 0) {
996b65c8 1767 if (ret != -EEXIST) {
7a485870
DG		 1768 ERR("Trace directory creation error");
1769 goto error;
1770 }
1771 }
1772
f3ed775e
DG		 1773error:
1774 return ret;
333f285e
DG		 1775}
1776
6c9cc2ab
DG		 1777/*
1778 * Using the session list, filled a lttng_session array to send back to the
1779 * client for session listing.
1780 *
1781 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1782 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG		 1783 */
1784static void list_lttng_sessions(struct lttng_session *sessions)
1785{
1786 int i = 0;
1787 struct ltt_session *session;
1788
1789 DBG("Getting all available session");
1790 /*
1791 * Iterate over session list and append data after the control struct in
1792 * the buffer.
1793 */
1794 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1795 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1796 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1797 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1798 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1799 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1800 i++;
1801 }
1802}
1803
9f19cc17
DG		 1804/*
1805 * Fill lttng_channel array of all channels.
1806 */
b551a063 1807static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1808 struct lttng_channel *channels)
1809{
1810 int i = 0;
1811 struct ltt_kernel_channel *kchan;
1812
1813 DBG("Listing channels for session %s", session->name);
1814
b551a063
DG		 1815 switch (domain) {
1816 case LTTNG_DOMAIN_KERNEL:
1817 /* Kernel channels */
1818 if (session->kernel_session != NULL) {
1819 cds_list_for_each_entry(kchan,
1820 &session->kernel_session->channel_list.head, list) {
1821 /* Copy lttng_channel struct to array */
1822 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1823 channels[i].enabled = kchan->enabled;
1824 i++;
1825 }
1826 }
1827 break;
1828 case LTTNG_DOMAIN_UST:
1829 {
1830 struct cds_lfht_iter iter;
1831 struct ltt_ust_channel *uchan;
1832
1833 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1834 &iter, uchan, node) {
1835 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1836 channels[i].attr.overwrite = uchan->attr.overwrite;
1837 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1838 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1839 channels[i].attr.switch_timer_interval =
1840 uchan->attr.switch_timer_interval;
1841 channels[i].attr.read_timer_interval =
1842 uchan->attr.read_timer_interval;
1843 channels[i].attr.output = uchan->attr.output;
1844 }
1845 break;
1846 }
1847 default:
1848 break;
1849 }
1850}
1851
1852/*
1853 * Create a list of ust global domain events.
1854 */
1855static int list_lttng_ust_global_events(char *channel_name,
1856 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1857{
1858 int i = 0, ret = 0;
1859 unsigned int nb_event = 0;
1860 struct cds_lfht_iter iter;
1861 struct ltt_ust_channel *uchan;
1862 struct ltt_ust_event *uevent;
1863 struct lttng_event *tmp;
1864
1865 DBG("Listing UST global events for channel %s", channel_name);
1866
1867 rcu_read_lock();
1868
1869 /* Count events in all channels */
1870 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1871 nb_event += hashtable_get_count(uchan->events);
1872 }
1873
1874 if (nb_event == 0) {
1875 ret = nb_event;
1876 goto error;
1877 }
1878
1879 DBG3("Listing UST global %d events", nb_event);
1880
1881 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
1882 if (tmp == NULL) {
1883 ret = -LTTCOMM_FATAL;
1884 goto error;
1885 }
1886
1887 cds_lfht_for_each_entry(ust_global->channels, &iter, uchan, node) {
1888 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
1889 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
1890 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
37357452 1891 tmp[i].enabled = uevent->enabled;
b551a063
DG		 1892 switch (uevent->attr.instrumentation) {
1893 case LTTNG_UST_TRACEPOINT:
1894 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
1895 break;
1896 case LTTNG_UST_PROBE:
1897 tmp[i].type = LTTNG_EVENT_PROBE;
1898 break;
1899 case LTTNG_UST_FUNCTION:
1900 tmp[i].type = LTTNG_EVENT_FUNCTION;
1901 break;
1902 }
9f19cc17
DG		 1903 i++;
1904 }
1905 }
1906
b551a063
DG		 1907 ret = nb_event;
1908 *events = tmp;
1909
1910error:
1911 rcu_read_unlock();
1912 return ret;
9f19cc17
DG		 1913}
1914
1915/*
b551a063 1916 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 1917 */
b551a063
DG		 1918static int list_lttng_kernel_events(char *channel_name,
1919 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 1920{
b551a063
DG		 1921 int i = 0, ret;
1922 unsigned int nb_event;
9f19cc17 1923 struct ltt_kernel_event *event;
b551a063
DG		 1924 struct ltt_kernel_channel *kchan;
1925
1926 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
1927 if (kchan == NULL) {
1928 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1929 goto error;
1930 }
1931
1932 nb_event = kchan->event_count;
9f19cc17
DG		 1933
1934 DBG("Listing events for channel %s", kchan->channel->name);
1935
b551a063
DG		 1936 if (nb_event == 0) {
1937 ret = nb_event;
1938 goto error;
1939 }
1940
1941 *events = zmalloc(nb_event * sizeof(struct lttng_event));
1942 if (*events == NULL) {
1943 ret = LTTCOMM_FATAL;
1944 goto error;
1945 }
1946
9f19cc17
DG		 1947 /* Kernel channels */
1948 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 1949 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
1950 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1951 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 1952 switch (event->event->instrumentation) {
1953 case LTTNG_KERNEL_TRACEPOINT:
b551a063 1954 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 1955 break;
1956 case LTTNG_KERNEL_KPROBE:
1957 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 1958 (*events)[i].type = LTTNG_EVENT_PROBE;
1959 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 1960 sizeof(struct lttng_kernel_kprobe));
1961 break;
1962 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 1963 (*events)[i].type = LTTNG_EVENT_FUNCTION;
1964 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 1965 sizeof(struct lttng_kernel_function));
1966 break;
0133c199 1967 case LTTNG_KERNEL_NOOP:
b551a063 1968 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 1969 break;
a54bd42d 1970 case LTTNG_KERNEL_SYSCALL:
b551a063 1971 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1972 break;
7a3d1328
MD		 1973 case LTTNG_KERNEL_ALL:
1974 assert(0);
1975 break;
9f19cc17
DG		 1976 }
1977 i++;
1978 }
b551a063
DG		 1979
1980 return nb_event;
1981
1982error:
1983 return ret;
9f19cc17
DG		 1984}
1985
fac6795d 1986/*
54d01ffb 1987 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1988 */
54d01ffb
DG		 1989static int cmd_disable_channel(struct ltt_session *session,
1990 int domain, char *channel_name)
fac6795d 1991{
54d01ffb 1992 int ret;
379473d2 1993
54d01ffb
DG		 1994 switch (domain) {
1995 case LTTNG_DOMAIN_KERNEL:
1996 ret = channel_kernel_disable(session->kernel_session,
1997 channel_name);
1998 if (ret != LTTCOMM_OK) {
333f285e
DG		 1999 goto error;
2000 }
54d01ffb
DG		 2001
2002 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 2003 break;
44d3bd01
DG		 2004 case LTTNG_DOMAIN_UST_PID:
2005 break;
d0254c7c 2006 default:
44d3bd01 2007 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 2008 goto error;
20fe2104
DG		 2009 }
2010
54d01ffb 2011 ret = LTTCOMM_OK;
d65106b1 2012
54d01ffb
DG		 2013error:
2014 return ret;
2015}
2016
56fff090
DG		 2017/*
2018 * Copy channel from attributes and set it in the application channel list.
2019 */
f6a9efaa 2020/*
56fff090
DG		 2021static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2022 struct lttng_channel *attr, struct ust_app *app)
2023{
2024 int ret;
2025 struct ltt_ust_channel *uchan, *new_chan;
2026
f6a9efaa 2027 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG		 2028 if (uchan == NULL) {
2029 ret = LTTCOMM_FATAL;
2030 goto error;
2031 }
2032
2033 new_chan = trace_ust_create_channel(attr, usess->path);
2034 if (new_chan == NULL) {
2035 PERROR("malloc ltt_ust_channel");
2036 ret = LTTCOMM_FATAL;
2037 goto error;
2038 }
2039
2040 ret = channel_ust_copy(new_chan, uchan);
2041 if (ret < 0) {
2042 ret = LTTCOMM_FATAL;
2043 goto error;
2044 }
2045
56fff090
DG		 2046error:
2047 return ret;
2048}
f6a9efaa 2049*/
56fff090 2050
54d01ffb
DG		 2051/*
2052 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2053 */
44d3bd01
DG		 2054static int cmd_enable_channel(struct ltt_session *session,
2055 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG		 2056{
2057 int ret;
f6a9efaa
DG		 2058 struct ltt_ust_session *usess = session->ust_session;
2059
5d56b5aa 2060 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2061
44d3bd01
DG		 2062 switch (domain->type) {
2063 case LTTNG_DOMAIN_KERNEL:
2064 {
2065 struct ltt_kernel_channel *kchan;
54d01ffb 2066
44d3bd01
DG		 2067 kchan = trace_kernel_get_channel_by_name(attr->name,
2068 session->kernel_session);
2069 if (kchan == NULL) {
2070 ret = channel_kernel_create(session->kernel_session,
2071 attr, kernel_poll_pipe[1]);
2072 } else {
2073 ret = channel_kernel_enable(session->kernel_session, kchan);
2074 }
2075
2076 if (ret != LTTCOMM_OK) {
2077 goto error;
2078 }
2079
2080 kernel_wait_quiescent(kernel_tracer_fd);
2081 break;
2082 }
f6a9efaa
DG		 2083 case LTTNG_DOMAIN_UST:
2084 {
2085 struct ltt_ust_channel *uchan;
2086
48842b30 2087 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2088
48842b30 2089 /* Get channel in global UST domain HT */
f6a9efaa
DG		 2090 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2091 attr->name);
2092 if (uchan == NULL) {
48842b30 2093 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG		 2094 if (uchan == NULL) {
2095 ret = LTTCOMM_UST_CHAN_FAIL;
2096 goto error;
2097 }
d5cd1f34 2098
f6a9efaa
DG		 2099 rcu_read_lock();
2100 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2101 rcu_read_unlock();
48842b30 2102 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa
DG		 2103 } else {
2104 ret = LTTCOMM_UST_CHAN_EXIST;
2105 goto error;
2106 }
2107
421cb601 2108 /* Add channel to all registered applications */
5b4a0ec0 2109 ret = ust_app_create_channel_all(usess, uchan);
509cbaf8 2110 if (ret != 0) {
48842b30
DG		 2111 goto error;
2112 }
f6a9efaa 2113
37357452
DG		 2114 uchan->enabled = 1;
2115
f6a9efaa
DG		 2116 break;
2117 }
44d3bd01
DG		 2118 case LTTNG_DOMAIN_UST_PID:
2119 {
f6a9efaa 2120 /*
56fff090
DG		 2121 int sock;
2122 struct ltt_ust_channel *uchan;
44d3bd01 2123 struct ltt_ust_session *usess;
56fff090 2124 struct ust_app *app;
44d3bd01
DG		 2125
2126 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2127 domain->attr.pid);
2128 if (usess == NULL) {
2129 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2130 goto error;
2131 }
2132
56fff090 2133 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG		 2134 if (app == NULL) {
2135 ret = LTTCOMM_APP_NOT_FOUND;
2136 goto error;
2137 }
56fff090 2138 sock = app->sock;
44d3bd01
DG		 2139
2140 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2141 if (uchan == NULL) {
56fff090 2142 ret = channel_ust_create(usess, attr, sock);
44d3bd01 2143 } else {
56fff090 2144 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG		 2145 }
2146
2147 if (ret != LTTCOMM_OK) {
2148 goto error;
2149 }
2150
56fff090
DG		 2151 ret = copy_ust_channel_to_app(usess, attr, app);
2152 if (ret != LTTCOMM_OK) {
44d3bd01
DG		 2153 goto error;
2154 }
2155
44d3bd01
DG		 2156 DBG("UST channel %s created for app sock %d with pid %d",
2157 attr->name, app->sock, domain->attr.pid);
f6a9efaa
DG		 2158 */
2159 ret = LTTCOMM_NOT_IMPLEMENTED;
2160 goto error;
44d3bd01
DG		 2161 }
2162 default:
2163 ret = LTTCOMM_UNKNOWN_DOMAIN;
2164 goto error;
54d01ffb
DG		 2165 }
2166
2167 ret = LTTCOMM_OK;
2168
2169error:
2170 return ret;
2171}
2172
2173/*
2174 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2175 */
2176static int cmd_disable_event(struct ltt_session *session, int domain,
2177 char *channel_name, char *event_name)
2178{
2179 int ret;
54d01ffb
DG		 2180
2181 switch (domain) {
2182 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2183 {
2184 struct ltt_kernel_channel *kchan;
2185
54d01ffb
DG		 2186 kchan = trace_kernel_get_channel_by_name(channel_name,
2187 session->kernel_session);
2188 if (kchan == NULL) {
2189 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2190 goto error;
d65106b1
DG		 2191 }
2192
7a3d1328 2193 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG		 2194 if (ret != LTTCOMM_OK) {
2195 goto error;
2196 }
2197
2198 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2199 break;
2bdd86d4
MD		 2200 }
2201 case LTTNG_DOMAIN_UST:
2bdd86d4
MD		 2202 case LTTNG_DOMAIN_UST_EXEC_NAME:
2203 case LTTNG_DOMAIN_UST_PID:
2204 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2205 default:
2bdd86d4 2206 /* TODO: Other UST domains */
54d01ffb
DG		 2207 ret = LTTCOMM_NOT_IMPLEMENTED;
2208 goto error;
d65106b1 2209 }
26cc6b4e 2210
54d01ffb
DG		 2211 ret = LTTCOMM_OK;
2212
2213error:
2214 return ret;
2215}
2216
2217/*
2218 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2219 */
2220static int cmd_disable_event_all(struct ltt_session *session, int domain,
2221 char *channel_name)
2222{
2223 int ret;
2224 struct ltt_kernel_channel *kchan;
2225
2226 switch (domain) {
2227 case LTTNG_DOMAIN_KERNEL:
2228 kchan = trace_kernel_get_channel_by_name(channel_name,
2229 session->kernel_session);
2230 if (kchan == NULL) {
2231 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2232 goto error;
26cc6b4e
DG		 2233 }
2234
54d01ffb
DG		 2235 ret = event_kernel_disable_all(session->kernel_session, kchan);
2236 if (ret != LTTCOMM_OK) {
0b97ec54 2237 goto error;
26cc6b4e
DG		 2238 }
2239
54d01ffb 2240 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2241 break;
54d01ffb
DG		 2242 default:
2243 /* TODO: Userspace tracing */
2244 ret = LTTCOMM_NOT_IMPLEMENTED;
2245 goto error;
26cc6b4e 2246 }
e953ef25 2247
54d01ffb 2248 ret = LTTCOMM_OK;
e953ef25 2249
54d01ffb
DG		 2250error:
2251 return ret;
2252}
f5177a38 2253
54d01ffb
DG		 2254/*
2255 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2256 */
2257static int cmd_add_context(struct ltt_session *session, int domain,
2258 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2259{
2260 int ret;
f5177a38 2261
54d01ffb
DG		 2262 switch (domain) {
2263 case LTTNG_DOMAIN_KERNEL:
2264 /* Add kernel context to kernel tracer */
2265 ret = context_kernel_add(session->kernel_session, ctx,
2266 event_name, channel_name);
2267 if (ret != LTTCOMM_OK) {
f5177a38 2268 goto error;
e953ef25 2269 }
2bdd86d4
MD		 2270 break;
2271 case LTTNG_DOMAIN_UST:
2272 {
48842b30
DG		 2273 /*
2274 struct ltt_ust_session *usess;
e953ef25 2275
48842b30
DG		 2276 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2277 ret = context_ust_add(usess, ctx,
2278 event_name, channel_name, domain);
2bdd86d4
MD		 2279 if (ret != LTTCOMM_OK) {
2280 goto error;
2281 }
2282 }
e953ef25 2283 break;
48842b30 2284 */
2bdd86d4 2285 }
54d01ffb 2286 default:
2bdd86d4 2287 /* TODO: UST other domains */
54d01ffb
DG		 2288 ret = LTTCOMM_NOT_IMPLEMENTED;
2289 goto error;
e953ef25 2290 }
950131af 2291
54d01ffb 2292 ret = LTTCOMM_OK;
950131af 2293
54d01ffb
DG		 2294error:
2295 return ret;
2296}
2297
2298/*
2299 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2300 */
2301static int cmd_enable_event(struct ltt_session *session, int domain,
2302 char *channel_name, struct lttng_event *event)
2303{
2304 int ret;
f6cd6b0f 2305 struct lttng_channel *attr;
48842b30 2306 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2307
2308 switch (domain) {
2309 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2310 {
2311 struct ltt_kernel_channel *kchan;
2312
54d01ffb
DG		 2313 kchan = trace_kernel_get_channel_by_name(channel_name,
2314 session->kernel_session);
2315 if (kchan == NULL) {
f6cd6b0f
DG		 2316 attr = channel_new_default_attr(domain);
2317 if (attr == NULL) {
2318 ret = LTTCOMM_FATAL;
2319 goto error;
2320 }
2321 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2322
54d01ffb 2323 /* This call will notify the kernel thread */
44d3bd01 2324 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2325 attr, kernel_poll_pipe[1]);
54d01ffb 2326 if (ret != LTTCOMM_OK) {
f5177a38
DG		 2327 goto error;
2328 }
54d01ffb 2329 }
950131af 2330
54d01ffb
DG		 2331 /* Get the newly created kernel channel pointer */
2332 kchan = trace_kernel_get_channel_by_name(channel_name,
2333 session->kernel_session);
2334 if (kchan == NULL) {
2335 /* This sould not happen... */
2336 ret = LTTCOMM_FATAL;
2337 goto error;
2338 }
f5177a38 2339
48842b30
DG		 2340 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2341 event);
54d01ffb 2342 if (ret != LTTCOMM_OK) {
f5177a38 2343 goto error;
950131af
DG		 2344 }
2345
54d01ffb 2346 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2347 break;
2bdd86d4
MD		 2348 }
2349 case LTTNG_DOMAIN_UST:
2350 {
48842b30
DG		 2351 struct ltt_ust_channel *uchan;
2352 struct ltt_ust_event *uevent;
2bdd86d4 2353
48842b30
DG		 2354 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2355 channel_name);
2356 if (uchan == NULL) {
2357 /* TODO: Create default channel */
2358 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2359 goto error;
2360 }
2bdd86d4 2361
48842b30
DG		 2362 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2363 if (uevent == NULL) {
2364 uevent = trace_ust_create_event(event);
2365 if (uevent == NULL) {
2bdd86d4
MD		 2366 ret = LTTCOMM_FATAL;
2367 goto error;
2368 }
d5cd1f34 2369
48842b30 2370 }
2bdd86d4 2371
5b4a0ec0 2372 ret = ust_app_create_event_all(usess, uchan, uevent);
48842b30
DG		 2373 if (ret < 0) {
2374 ret = LTTCOMM_UST_ENABLE_FAIL;
2375 goto error;
2bdd86d4 2376 }
487cf67c 2377
d5cd1f34 2378 /* Add ltt ust event to channel */
487cf67c
DG		 2379 rcu_read_lock();
2380 hashtable_add_unique(uchan->events, &uevent->node);
2381 rcu_read_unlock();
d5cd1f34 2382
37357452
DG		 2383 uevent->enabled = 1;
2384
d5cd1f34
DG		 2385 DBG3("UST ltt event %s added to channel %s", uevent->attr.name,
2386 uchan->name);
2bdd86d4
MD		 2387 break;
2388 }
2389 case LTTNG_DOMAIN_UST_EXEC_NAME:
2390 case LTTNG_DOMAIN_UST_PID:
2391 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2392 default:
54d01ffb
DG		 2393 ret = LTTCOMM_NOT_IMPLEMENTED;
2394 goto error;
950131af 2395 }
d36b8583 2396
54d01ffb 2397 ret = LTTCOMM_OK;
d36b8583 2398
54d01ffb
DG		 2399error:
2400 return ret;
2401}
7d29a247 2402
54d01ffb
DG		 2403/*
2404 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2405 */
2406static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2407 char *channel_name, int event_type)
54d01ffb
DG		 2408{
2409 int ret;
2410 struct ltt_kernel_channel *kchan;
7d29a247 2411
54d01ffb
DG		 2412 switch (domain) {
2413 case LTTNG_DOMAIN_KERNEL:
2414 kchan = trace_kernel_get_channel_by_name(channel_name,
2415 session->kernel_session);
2416 if (kchan == NULL) {
2417 /* This call will notify the kernel thread */
44d3bd01
DG		 2418 ret = channel_kernel_create(session->kernel_session, NULL,
2419 kernel_poll_pipe[1]);
54d01ffb
DG		 2420 if (ret != LTTCOMM_OK) {
2421 goto error;
d36b8583 2422 }
54d01ffb 2423 }
0d0c377a 2424
54d01ffb
DG		 2425 /* Get the newly created kernel channel pointer */
2426 kchan = trace_kernel_get_channel_by_name(channel_name,
2427 session->kernel_session);
2428 if (kchan == NULL) {
2429 /* This sould not happen... */
2430 ret = LTTCOMM_FATAL;
2431 goto error;
2432 }
0fdd1e2c 2433
7a3d1328
MD		 2434 switch (event_type) {
2435 case LTTNG_KERNEL_SYSCALL:
2436 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2437 kchan, kernel_tracer_fd);
7a3d1328
MD		 2438 break;
2439 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2440 /*
7a3d1328
MD		 2441 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2442 * events already registered to the channel.
8c9ae521 2443 */
7a3d1328
MD		 2444 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2445 kchan, kernel_tracer_fd);
2446 break;
2447 case LTTNG_KERNEL_ALL:
2448 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2449 ret = event_kernel_enable_all(session->kernel_session,
2450 kchan, kernel_tracer_fd);
7a3d1328
MD		 2451 break;
2452 default:
2453 ret = LTTCOMM_KERN_ENABLE_FAIL;
2454 goto error;
8c9ae521 2455 }
54d01ffb 2456 if (ret != LTTCOMM_OK) {
0d0c377a 2457 goto error;
d36b8583
DG		 2458 }
2459
54d01ffb 2460 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2461 break;
54d01ffb
DG		 2462 default:
2463 /* TODO: Userspace tracing */
2464 ret = LTTCOMM_NOT_IMPLEMENTED;
2465 goto error;
d36b8583 2466 }
f3ed775e 2467
54d01ffb
DG		 2468 ret = LTTCOMM_OK;
2469
2470error:
2471 return ret;
2472}
2473
2474/*
2475 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2476 */
2477static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2478{
2479 int ret;
2480 ssize_t nb_events = 0;
2481
2482 switch (domain) {
2483 case LTTNG_DOMAIN_KERNEL:
2484 nb_events = kernel_list_events(kernel_tracer_fd, events);
2485 if (nb_events < 0) {
2486 ret = LTTCOMM_KERN_LIST_FAIL;
2487 goto error;
894be886 2488 }
54d01ffb 2489 break;
b551a063
DG		 2490 case LTTNG_DOMAIN_UST:
2491 nb_events = ust_app_list_events(events);
2492 if (nb_events < 0) {
2493 ret = LTTCOMM_UST_LIST_FAIL;
2494 goto error;
2495 }
2496 break;
54d01ffb 2497 default:
54d01ffb
DG		 2498 ret = LTTCOMM_NOT_IMPLEMENTED;
2499 goto error;
2500 }
894be886 2501
54d01ffb 2502 return nb_events;
7d29a247 2503
54d01ffb
DG		 2504error:
2505 /* Return negative value to differentiate return code */
2506 return -ret;
2507}
b389abbe 2508
54d01ffb
DG		 2509/*
2510 * Command LTTNG_START_TRACE processed by the client thread.
2511 */
2512static int cmd_start_trace(struct ltt_session *session)
2513{
2514 int ret;
54d01ffb 2515 struct ltt_kernel_session *ksession;
b9d9b220 2516 struct ltt_ust_session *usess;
b389abbe 2517
54d01ffb
DG		 2518 /* Short cut */
2519 ksession = session->kernel_session;
b9d9b220 2520 usess = session->ust_session;
5eb91c98 2521
464dd62d
MD		 2522 if (session->enabled)
2523 return LTTCOMM_UST_START_FAIL;
2524 session->enabled = 1;
2525
54d01ffb
DG		 2526 /* Kernel tracing */
2527 if (ksession != NULL) {
2bdd86d4
MD		 2528 struct ltt_kernel_channel *kchan;
2529
54d01ffb
DG		 2530 /* Open kernel metadata */
2531 if (ksession->metadata == NULL) {
2532 ret = kernel_open_metadata(ksession, ksession->trace_path);
2533 if (ret < 0) {
2534 ret = LTTCOMM_KERN_META_FAIL;
2535 goto error;
b389abbe 2536 }
54d01ffb 2537 }
7d29a247 2538
54d01ffb
DG		 2539 /* Open kernel metadata stream */
2540 if (ksession->metadata_stream_fd == 0) {
2541 ret = kernel_open_metadata_stream(ksession);
2542 if (ret < 0) {
2543 ERR("Kernel create metadata stream failed");
2544 ret = LTTCOMM_KERN_STREAM_FAIL;
2545 goto error;
2546 }
2547 }
2548
2549 /* For each channel */
2550 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2551 if (kchan->stream_count == 0) {
2552 ret = kernel_open_channel_stream(kchan);
2553 if (ret < 0) {
2554 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2555 goto error;
2556 }
54d01ffb
DG		 2557 /* Update the stream global counter */
2558 ksession->stream_count_global += ret;
7d29a247 2559 }
54d01ffb
DG		 2560 }
2561
2562 /* Setup kernel consumer socket and send fds to it */
2563 ret = init_kernel_tracing(ksession);
2564 if (ret < 0) {
2565 ret = LTTCOMM_KERN_START_FAIL;
2566 goto error;
2567 }
2568
2569 /* This start the kernel tracing */
2570 ret = kernel_start_session(ksession);
2571 if (ret < 0) {
2572 ret = LTTCOMM_KERN_START_FAIL;
2573 goto error;
2574 }
2575
2576 /* Quiescent wait after starting trace */
2577 kernel_wait_quiescent(kernel_tracer_fd);
2578 }
2579
36dc12cc 2580 /* Flag session that trace should start automatically */
b9d9b220
DG		 2581 if (usess) {
2582 usess->start_trace = 1;
36dc12cc 2583
b9d9b220
DG		 2584 ret = ust_app_start_trace_all(usess);
2585 if (ret < 0) {
2586 ret = LTTCOMM_UST_START_FAIL;
2587 goto error;
2588 }
2bdd86d4 2589 }
54d01ffb
DG		 2590
2591 ret = LTTCOMM_OK;
2592
2593error:
2594 return ret;
2595}
2596
2597/*
2598 * Command LTTNG_STOP_TRACE processed by the client thread.
2599 */
2600static int cmd_stop_trace(struct ltt_session *session)
2601{
2602 int ret;
2603 struct ltt_kernel_channel *kchan;
2604 struct ltt_kernel_session *ksession;
8be98f9a 2605 struct ltt_ust_session *usess;
54d01ffb
DG		 2606
2607 /* Short cut */
2608 ksession = session->kernel_session;
8be98f9a 2609 usess = session->ust_session;
54d01ffb 2610
464dd62d
MD		 2611 if (!session->enabled)
2612 return LTTCOMM_UST_START_FAIL;
2613 session->enabled = 0;
2614
54d01ffb
DG		 2615 /* Kernel tracer */
2616 if (ksession != NULL) {
2617 DBG("Stop kernel tracing");
2618
2619 /* Flush all buffers before stopping */
2620 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2621 if (ret < 0) {
2622 ERR("Kernel metadata flush failed");
2623 }
f34daff7 2624
54d01ffb
DG		 2625 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2626 ret = kernel_flush_buffer(kchan);
0d0c377a 2627 if (ret < 0) {
54d01ffb 2628 ERR("Kernel flush buffer error");
7d29a247 2629 }
54d01ffb 2630 }
19e70852 2631
54d01ffb
DG		 2632 ret = kernel_stop_session(ksession);
2633 if (ret < 0) {
2634 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2635 goto error;
f3ed775e 2636 }
54d01ffb
DG		 2637
2638 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2639 }
54d01ffb 2640
8be98f9a
MD		 2641 /* Flag session that trace should start automatically */
2642 if (usess) {
2643 usess->start_trace = 0;
2bdd86d4 2644
8be98f9a 2645 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2646 if (ret < 0) {
8be98f9a 2647 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD		 2648 goto error;
2649 }
2bdd86d4 2650 }
54d01ffb
DG		 2651
2652 ret = LTTCOMM_OK;
2653
2654error:
2655 return ret;
2656}
2657
2658/*
2659 * Command LTTNG_CREATE_SESSION processed by the client thread.
2660 */
2661static int cmd_create_session(char *name, char *path)
2662{
2663 int ret;
2664
2665 ret = session_create(name, path);
2666 if (ret != LTTCOMM_OK) {
2667 goto error;
2668 }
2669
2670 ret = LTTCOMM_OK;
2671
2672error:
2673 return ret;
2674}
2675
2676/*
2677 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2678 */
2679static int cmd_destroy_session(struct ltt_session *session, char *name)
2680{
2681 int ret;
2682
2683 /* Clean kernel session teardown */
2684 teardown_kernel_session(session);
84cd17c6
MD		 2685 /* UST session teardown */
2686 teardown_ust_session(session);
54d01ffb
DG		 2687
2688 /*
2689 * Must notify the kernel thread here to update it's poll setin order
2690 * to remove the channel(s)' fd just destroyed.
2691 */
2692 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2693 if (ret < 0) {
2694 perror("write kernel poll pipe");
2695 }
2696
271933a4 2697 ret = session_destroy(session);
54d01ffb
DG		 2698
2699 return ret;
2700}
2701
2702/*
2703 * Command LTTNG_CALIBRATE processed by the client thread.
2704 */
2705static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2706{
2707 int ret;
2708
2709 switch (domain) {
2710 case LTTNG_DOMAIN_KERNEL:
33a2b854 2711 {
54d01ffb 2712 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2713
54d01ffb
DG		 2714 kcalibrate.type = calibrate->type;
2715 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2716 if (ret < 0) {
54d01ffb
DG		 2717 ret = LTTCOMM_KERN_ENABLE_FAIL;
2718 goto error;
33a2b854 2719 }
54d01ffb
DG		 2720 break;
2721 }
2722 default:
2723 /* TODO: Userspace tracing */
2724 ret = LTTCOMM_NOT_IMPLEMENTED;
2725 goto error;
2726 }
33a2b854 2727
54d01ffb 2728 ret = LTTCOMM_OK;
33a2b854 2729
54d01ffb
DG		 2730error:
2731 return ret;
2732}
7d29a247 2733
54d01ffb
DG		 2734/*
2735 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2736 */
2737static int cmd_register_consumer(struct ltt_session *session, int domain,
2738 char *sock_path)
2739{
2740 int ret, sock;
b389abbe 2741
54d01ffb
DG		 2742 switch (domain) {
2743 case LTTNG_DOMAIN_KERNEL:
2744 /* Can't register a consumer if there is already one */
2745 if (session->kernel_session->consumer_fd != 0) {
2746 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2747 goto error;
2748 }
2749
2750 sock = lttcomm_connect_unix_sock(sock_path);
2751 if (sock < 0) {
2752 ret = LTTCOMM_CONNECT_FAIL;
2753 goto error;
2754 }
2755
2756 session->kernel_session->consumer_fd = sock;
2757 break;
2758 default:
2759 /* TODO: Userspace tracing */
2760 ret = LTTCOMM_NOT_IMPLEMENTED;
2761 goto error;
2762 }
2763
2764 ret = LTTCOMM_OK;
2765
2766error:
2767 return ret;
2768}
2769
2770/*
2771 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2772 */
2773static ssize_t cmd_list_domains(struct ltt_session *session,
2774 struct lttng_domain **domains)
2775{
b551a063 2776 int ret, index = 0;
54d01ffb
DG		 2777 ssize_t nb_dom = 0;
2778
2779 if (session->kernel_session != NULL) {
b551a063 2780 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 2781 nb_dom++;
2782 }
2783
b551a063
DG		 2784 if (session->ust_session != NULL) {
2785 DBG3("Listing domains found UST global domain");
2786 nb_dom++;
2787 }
54d01ffb 2788
b551a063 2789 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 2790 if (*domains == NULL) {
2791 ret = -LTTCOMM_FATAL;
2792 goto error;
2793 }
2794
b551a063
DG		 2795 if (session->kernel_session != NULL) {
2796 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2797 index++;
2798 }
2799
2800 if (session->ust_session != NULL) {
2801 (*domains)[index].type = LTTNG_DOMAIN_UST;
2802 index++;
2803 }
54d01ffb 2804
54d01ffb
DG		 2805 return nb_dom;
2806
2807error:
2808 return ret;
2809}
2810
2811/*
2812 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2813 */
b551a063 2814static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 2815 struct lttng_channel **channels)
2816{
2817 int ret;
2818 ssize_t nb_chan = 0;
2819
b551a063
DG		 2820 switch (domain) {
2821 case LTTNG_DOMAIN_KERNEL:
2822 if (session->kernel_session != NULL) {
2823 nb_chan = session->kernel_session->channel_count;
2824 }
2825 DBG3("Number of kernel channels %ld", nb_chan);
2826 break;
2827 case LTTNG_DOMAIN_UST:
2828 if (session->ust_session != NULL) {
2829 nb_chan = hashtable_get_count(
2830 session->ust_session->domain_global.channels);
2831 }
2832 DBG3("Number of UST global channels %ld", nb_chan);
2833 break;
2834 default:
2835 *channels = NULL;
2836 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 2837 goto error;
2838 }
2839
b551a063
DG		 2840 if (nb_chan > 0) {
2841 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2842 if (*channels == NULL) {
2843 ret = -LTTCOMM_FATAL;
2844 goto error;
2845 }
54d01ffb 2846
b551a063
DG		 2847 list_lttng_channels(domain, session, *channels);
2848 } else {
2849 *channels = NULL;
2850 }
2bdd86d4 2851
54d01ffb
DG		 2852 return nb_chan;
2853
2854error:
2855 return ret;
2856}
2857
2858/*
2859 * Command LTTNG_LIST_EVENTS processed by the client thread.
2860 */
b551a063 2861static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 2862 char *channel_name, struct lttng_event **events)
2863{
b551a063 2864 int ret = 0;
54d01ffb 2865 ssize_t nb_event = 0;
54d01ffb 2866
b551a063
DG		 2867 switch (domain) {
2868 case LTTNG_DOMAIN_KERNEL:
2869 if (session->kernel_session != NULL) {
2870 nb_event = list_lttng_kernel_events(channel_name,
2871 session->kernel_session, events);
54d01ffb 2872 }
b551a063
DG		 2873 break;
2874 case LTTNG_DOMAIN_UST:
2875 {
2876 if (session->ust_session != NULL) {
2877 nb_event = list_lttng_ust_global_events(channel_name,
2878 &session->ust_session->domain_global, events);
2879 }
2880 break;
54d01ffb 2881 }
b551a063
DG		 2882 default:
2883 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 2884 goto error;
2885 }
2886
b551a063 2887 ret = nb_event;
54d01ffb
DG		 2888
2889error:
2890 return ret;
2891}
2892
2893/*
2894 * Process the command requested by the lttng client within the command
2895 * context structure. This function make sure that the return structure (llm)
2896 * is set and ready for transmission before returning.
2897 *
2898 * Return any error encountered or 0 for success.
2899 */
2900static int process_client_msg(struct command_ctx *cmd_ctx)
2901{
2902 int ret = LTTCOMM_OK;
44d3bd01 2903 int need_tracing_session = 1;
54d01ffb
DG		 2904
2905 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2906
2907 /*
2908 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2909 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 2910 * command.
2911 */
2912 switch(cmd_ctx->lsm->cmd_type) {
2913 case LTTNG_LIST_SESSIONS:
2914 case LTTNG_LIST_TRACEPOINTS:
2915 case LTTNG_LIST_DOMAINS:
2916 case LTTNG_LIST_CHANNELS:
2917 case LTTNG_LIST_EVENTS:
2918 break;
2919 default:
2920 /* Setup lttng message with no payload */
2921 ret = setup_lttng_msg(cmd_ctx, 0);
2922 if (ret < 0) {
2923 /* This label does not try to unlock the session */
2924 goto init_setup_error;
2925 }
2926 }
2927
2928 /* Commands that DO NOT need a session. */
2929 switch (cmd_ctx->lsm->cmd_type) {
2930 case LTTNG_CALIBRATE:
2931 case LTTNG_CREATE_SESSION:
2932 case LTTNG_LIST_SESSIONS:
2933 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2934 need_tracing_session = 0;
54d01ffb
DG		 2935 break;
2936 default:
2937 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 2938 session_lock_list();
54d01ffb 2939 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 2940 session_unlock_list();
54d01ffb
DG		 2941 if (cmd_ctx->session == NULL) {
2942 if (cmd_ctx->lsm->session.name != NULL) {
2943 ret = LTTCOMM_SESS_NOT_FOUND;
2944 } else {
2945 /* If no session name specified */
2946 ret = LTTCOMM_SELECT_SESS;
2947 }
2948 goto error;
2949 } else {
2950 /* Acquire lock for the session */
2951 session_lock(cmd_ctx->session);
2952 }
2953 break;
2954 }
b389abbe 2955
54d01ffb
DG		 2956 /*
2957 * Check domain type for specific "pre-action".
2958 */
2959 switch (cmd_ctx->lsm->domain.type) {
2960 case LTTNG_DOMAIN_KERNEL:
2961 /* Kernel tracer check */
2962 if (kernel_tracer_fd == 0) {
2963 /* Basically, load kernel tracer modules */
2964 init_kernel_tracer();
2965 if (kernel_tracer_fd == 0) {
2966 ret = LTTCOMM_KERN_NA;
2967 goto error;
2968 }
2969 }
5eb91c98 2970
54d01ffb 2971 /* Need a session for kernel command */
44d3bd01 2972 if (need_tracing_session) {
54d01ffb
DG		 2973 if (cmd_ctx->session->kernel_session == NULL) {
2974 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2975 if (ret < 0) {
54d01ffb 2976 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 2977 goto error;
2978 }
b389abbe 2979 }
7d29a247 2980
54d01ffb 2981 /* Start the kernel consumer daemon */
3bd1e081
MD		 2982 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2983 if (kconsumer_data.pid == 0 &&
54d01ffb 2984 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 2985 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2986 ret = start_consumerd(&kconsumer_data);
7d29a247 2987 if (ret < 0) {
54d01ffb
DG		 2988 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2989 goto error;
950131af 2990 }
33a2b854 2991 }
3bd1e081 2992 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
0d0c377a 2993 }
54d01ffb 2994 break;
2bdd86d4 2995 case LTTNG_DOMAIN_UST:
44d3bd01 2996 {
44d3bd01 2997 if (need_tracing_session) {
f6a9efaa 2998 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG		 2999 ret = create_ust_session(cmd_ctx->session,
3000 &cmd_ctx->lsm->domain);
3001 if (ret != LTTCOMM_OK) {
3002 goto error;
3003 }
3004 }
2bdd86d4
MD		 3005 /* Start the kernel consumer daemon */
3006 pthread_mutex_lock(&ustconsumer_data.pid_mutex);
3007 if (ustconsumer_data.pid == 0 &&
3008 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3009 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
3010 ret = start_consumerd(&ustconsumer_data);
3011 if (ret < 0) {
3012 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3013 goto error;
3014 }
48842b30 3015
ba5d816e 3016 ust_consumer_fd = ustconsumer_data.cmd_sock;
2bdd86d4
MD		 3017 }
3018 pthread_mutex_unlock(&ustconsumer_data.pid_mutex);
44d3bd01
DG		 3019 }
3020 break;
48842b30 3021 }
54d01ffb 3022 default:
54d01ffb
DG		 3023 break;
3024 }
33a2b854 3025
54d01ffb
DG		 3026 /* Process by command type */
3027 switch (cmd_ctx->lsm->cmd_type) {
3028 case LTTNG_ADD_CONTEXT:
3029 {
3030 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3031 cmd_ctx->lsm->u.context.channel_name,
3032 cmd_ctx->lsm->u.context.event_name,
3033 &cmd_ctx->lsm->u.context.ctx);
3034 break;
3035 }
3036 case LTTNG_DISABLE_CHANNEL:
3037 {
3038 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3039 cmd_ctx->lsm->u.disable.channel_name);
3040 break;
3041 }
3042 case LTTNG_DISABLE_EVENT:
3043 {
3044 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3045 cmd_ctx->lsm->u.disable.channel_name,
3046 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3047 ret = LTTCOMM_OK;
3048 break;
3049 }
54d01ffb
DG		 3050 case LTTNG_DISABLE_ALL_EVENT:
3051 {
2bdd86d4 3052 DBG("Disabling all events");
54d01ffb
DG		 3053
3054 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3055 cmd_ctx->lsm->u.disable.channel_name);
3056 break;
3057 }
3058 case LTTNG_ENABLE_CHANNEL:
3059 {
44d3bd01 3060 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG		 3061 &cmd_ctx->lsm->u.channel.chan);
3062 break;
3063 }
3064 case LTTNG_ENABLE_EVENT:
3065 {
3066 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3067 cmd_ctx->lsm->u.enable.channel_name,
3068 &cmd_ctx->lsm->u.enable.event);
3069 break;
3070 }
3071 case LTTNG_ENABLE_ALL_EVENT:
3072 {
2bdd86d4 3073 DBG("Enabling all events");
54d01ffb
DG		 3074
3075 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3076 cmd_ctx->lsm->u.enable.channel_name,
3077 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3078 break;
3079 }
052da939 3080 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3081 {
9f19cc17 3082 struct lttng_event *events;
54d01ffb 3083 ssize_t nb_events;
052da939 3084
54d01ffb
DG		 3085 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3086 if (nb_events < 0) {
3087 ret = -nb_events;
3088 goto error;
2ef84c95
DG		 3089 }
3090
3091 /*
3092 * Setup lttng message with payload size set to the event list size in
3093 * bytes and then copy list into the llm payload.
3094 */
052da939 3095 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3096 if (ret < 0) {
052da939 3097 free(events);
2ef84c95
DG		 3098 goto setup_error;
3099 }
3100
3101 /* Copy event list into message payload */
9f19cc17 3102 memcpy(cmd_ctx->llm->payload, events,
052da939 3103 sizeof(struct lttng_event) * nb_events);
2ef84c95 3104
9f19cc17 3105 free(events);
2ef84c95
DG		 3106
3107 ret = LTTCOMM_OK;
3108 break;
3109 }
f3ed775e 3110 case LTTNG_START_TRACE:
8c0faa1d 3111 {
54d01ffb 3112 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3113 break;
3114 }
f3ed775e 3115 case LTTNG_STOP_TRACE:
8c0faa1d 3116 {
54d01ffb 3117 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3118 break;
3119 }
5e16da05
MD		 3120 case LTTNG_CREATE_SESSION:
3121 {
54d01ffb
DG		 3122 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3123 cmd_ctx->lsm->session.path);
5e16da05
MD		 3124 break;
3125 }
3126 case LTTNG_DESTROY_SESSION:
3127 {
54d01ffb
DG		 3128 ret = cmd_destroy_session(cmd_ctx->session,
3129 cmd_ctx->lsm->session.name);
5461b305 3130 break;
5e16da05 3131 }
9f19cc17 3132 case LTTNG_LIST_DOMAINS:
5e16da05 3133 {
54d01ffb
DG		 3134 ssize_t nb_dom;
3135 struct lttng_domain *domains;
5461b305 3136
54d01ffb
DG		 3137 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3138 if (nb_dom < 0) {
3139 ret = -nb_dom;
3140 goto error;
ce3d728c 3141 }
520ff687 3142
54d01ffb 3143 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3144 if (ret < 0) {
3145 goto setup_error;
520ff687 3146 }
57167058 3147
54d01ffb
DG		 3148 /* Copy event list into message payload */
3149 memcpy(cmd_ctx->llm->payload, domains,
3150 nb_dom * sizeof(struct lttng_domain));
3151
3152 free(domains);
5e16da05 3153
5461b305 3154 ret = LTTCOMM_OK;
5e16da05
MD		 3155 break;
3156 }
9f19cc17 3157 case LTTNG_LIST_CHANNELS:
5e16da05 3158 {
54d01ffb
DG		 3159 size_t nb_chan;
3160 struct lttng_channel *channels;
3161
b551a063
DG		 3162 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3163 cmd_ctx->session, &channels);
54d01ffb
DG		 3164 if (nb_chan < 0) {
3165 ret = -nb_chan;
3166 goto error;
5461b305 3167 }
ca95a216 3168
54d01ffb 3169 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3170 if (ret < 0) {
3171 goto setup_error;
3172 }
9f19cc17 3173
54d01ffb
DG		 3174 /* Copy event list into message payload */
3175 memcpy(cmd_ctx->llm->payload, channels,
3176 nb_chan * sizeof(struct lttng_channel));
3177
3178 free(channels);
9f19cc17
DG		 3179
3180 ret = LTTCOMM_OK;
5461b305 3181 break;
5e16da05 3182 }
9f19cc17 3183 case LTTNG_LIST_EVENTS:
5e16da05 3184 {
b551a063 3185 ssize_t nb_event;
684d34d2 3186 struct lttng_event *events = NULL;
9f19cc17 3187
b551a063 3188 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3189 cmd_ctx->lsm->u.list.channel_name, &events);
3190 if (nb_event < 0) {
3191 ret = -nb_event;
3192 goto error;
5461b305 3193 }
ca95a216 3194
54d01ffb 3195 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3196 if (ret < 0) {
3197 goto setup_error;
3198 }
9f19cc17 3199
54d01ffb
DG		 3200 /* Copy event list into message payload */
3201 memcpy(cmd_ctx->llm->payload, events,
3202 nb_event * sizeof(struct lttng_event));
9f19cc17 3203
54d01ffb 3204 free(events);
9f19cc17
DG		 3205
3206 ret = LTTCOMM_OK;
5461b305 3207 break;
5e16da05
MD		 3208 }
3209 case LTTNG_LIST_SESSIONS:
3210 {
54d01ffb 3211 session_lock_list();
5461b305 3212
6c9cc2ab 3213 if (session_list_ptr->count == 0) {
f3ed775e 3214 ret = LTTCOMM_NO_SESSION;
54d01ffb 3215 session_unlock_list();
5461b305 3216 goto error;
57167058 3217 }
5e16da05 3218
6c9cc2ab
DG		 3219 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3220 session_list_ptr->count);
5461b305 3221 if (ret < 0) {
54d01ffb 3222 session_unlock_list();
5461b305 3223 goto setup_error;
e065084a 3224 }
5e16da05 3225
6c9cc2ab
DG		 3226 /* Filled the session array */
3227 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3228
54d01ffb 3229 session_unlock_list();
5e16da05 3230
5461b305 3231 ret = LTTCOMM_OK;
5e16da05
MD		 3232 break;
3233 }
d0254c7c
MD		 3234 case LTTNG_CALIBRATE:
3235 {
54d01ffb
DG		 3236 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3237 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3238 break;
3239 }
d9800920
DG		 3240 case LTTNG_REGISTER_CONSUMER:
3241 {
54d01ffb
DG		 3242 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3243 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3244 break;
3245 }
5e16da05 3246 default:
5e16da05 3247 ret = LTTCOMM_UND;
5461b305 3248 break;
fac6795d
DG		 3249 }
3250
5461b305 3251error:
5461b305
DG		 3252 if (cmd_ctx->llm == NULL) {
3253 DBG("Missing llm structure. Allocating one.");
894be886 3254 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3255 goto setup_error;
3256 }
3257 }
54d01ffb 3258 /* Set return code */
5461b305 3259 cmd_ctx->llm->ret_code = ret;
5461b305 3260setup_error:
b5541356 3261 if (cmd_ctx->session) {
54d01ffb 3262 session_unlock(cmd_ctx->session);
b5541356 3263 }
54d01ffb 3264init_setup_error:
8028d920 3265 return ret;
fac6795d
DG		 3266}
3267
1d4b027a 3268/*
d063d709
DG		 3269 * This thread manage all clients request using the unix client socket for
3270 * communication.
1d4b027a
DG		 3271 */
3272static void *thread_manage_clients(void *data)
3273{
5eb91c98
DG		 3274 int sock = 0, ret, i, pollfd;
3275 uint32_t revents, nb_fd;
273ea72c 3276 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3277 struct lttng_poll_event events;
1d4b027a
DG		 3278
3279 DBG("[thread] Manage client started");
3280
f6a9efaa
DG		 3281 rcu_register_thread();
3282
1d4b027a
DG		 3283 ret = lttcomm_listen_unix_sock(client_sock);
3284 if (ret < 0) {
3285 goto error;
3286 }
3287
5eb91c98
DG		 3288 /*
3289 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3290 * more will be added to this poll set.
3291 */
3292 ret = create_thread_poll_set(&events, 2);
3293 if (ret < 0) {
3294 goto error;
3295 }
273ea72c 3296
5eb91c98
DG		 3297 /* Add the application registration socket */
3298 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3299 if (ret < 0) {
3300 goto error;
3301 }
273ea72c 3302
bbd973c2
DG		 3303 /*
3304 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3305 */
3306 if (opt_sig_parent) {
3307 kill(ppid, SIGCHLD);
3308 }
3309
3310 while (1) {
1d4b027a 3311 DBG("Accepting client command ...");
273ea72c 3312
5eb91c98
DG		 3313 nb_fd = LTTNG_POLL_GETNB(&events);
3314
273ea72c 3315 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3316 ret = lttng_poll_wait(&events, -1);
273ea72c 3317 if (ret < 0) {
273ea72c
DG		 3318 goto error;
3319 }
3320
5eb91c98
DG		 3321 for (i = 0; i < nb_fd; i++) {
3322 /* Fetch once the poll data */
3323 revents = LTTNG_POLL_GETEV(&events, i);
3324 pollfd = LTTNG_POLL_GETFD(&events, i);
3325
3326 /* Thread quit pipe has been closed. Killing thread. */
3327 ret = check_thread_quit_pipe(pollfd, revents);
3328 if (ret) {
3329 goto error;
3330 }
3331
3332 /* Event on the registration socket */
3333 if (pollfd == client_sock) {
3334 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3335 ERR("Client socket poll error");
3336 goto error;
3337 }
3338 }
3339 }
3340
3341 DBG("Wait for client response");
3342
3343 sock = lttcomm_accept_unix_sock(client_sock);
3344 if (sock < 0) {
273ea72c 3345 goto error;
273ea72c
DG		 3346 }
3347
5eb91c98 3348 /* Allocate context command to process the client request */
ba7f0ae5 3349 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3350 if (cmd_ctx == NULL) {
ba7f0ae5 3351 perror("zmalloc cmd_ctx");
1d4b027a 3352 goto error;
5eb91c98 3353 }
1d4b027a 3354
5eb91c98 3355 /* Allocate data buffer for reception */
ba7f0ae5 3356 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3357 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3358 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3359 goto error;
3360 }
1d4b027a 3361
5eb91c98
DG		 3362 cmd_ctx->llm = NULL;
3363 cmd_ctx->session = NULL;
1d4b027a 3364
5eb91c98
DG		 3365 /*
3366 * Data is received from the lttng client. The struct
3367 * lttcomm_session_msg (lsm) contains the command and data request of
3368 * the client.
3369 */
3370 DBG("Receiving data from client ...");
3371 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3372 sizeof(struct lttcomm_session_msg));
3373 if (ret <= 0) {
3374 DBG("Nothing recv() from client... continuing");
3375 close(sock);
3376 free(cmd_ctx);
3377 continue;
3378 }
1d4b027a 3379
5eb91c98
DG		 3380 // TODO: Validate cmd_ctx including sanity check for
3381 // security purpose.
f7776ea7 3382
f6a9efaa 3383 rcu_thread_online();
5eb91c98
DG		 3384 /*
3385 * This function dispatch the work to the kernel or userspace tracer
3386 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3387 * informations for the client. The command context struct contains
3388 * everything this function may needs.
3389 */
3390 ret = process_client_msg(cmd_ctx);
f6a9efaa 3391 rcu_thread_offline();
5eb91c98 3392 if (ret < 0) {
bbd973c2 3393 /*
5eb91c98 3394 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3395 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3396 * (ENOMEM). Error detected but still accept command.
bbd973c2 3397 */
bbd973c2 3398 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3399 continue;
3400 }
d6e4fca4 3401
54d01ffb
DG		 3402 DBG("Sending response (size: %d, retcode: %s)",
3403 cmd_ctx->lttng_msg_size,
9a745bc7 3404 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3405 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3406 if (ret < 0) {
3407 ERR("Failed to send data back to client");
bbd973c2 3408 }
1d4b027a 3409
5eb91c98
DG		 3410 clean_command_ctx(&cmd_ctx);
3411
3412 /* End of transmission */
273ea72c
DG		 3413 close(sock);
3414 }
3415
5eb91c98
DG		 3416error:
3417 DBG("Client thread dying");
273ea72c 3418 unlink(client_unix_sock_path);
5eb91c98
DG		 3419 close(client_sock);
3420 close(sock);
273ea72c 3421
5eb91c98 3422 lttng_poll_clean(&events);
a2fb29a5 3423 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3424
3425 rcu_unregister_thread();
1d4b027a
DG		 3426 return NULL;
3427}
3428
3429
fac6795d
DG		 3430/*
3431 * usage function on stderr
3432 */
3433static void usage(void)
3434{
b716ce68 3435 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3436 fprintf(stderr, " -h, --help Display this usage.\n");
3437 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3438 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3439 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3440 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3bd1e081
MD		 3441 fprintf(stderr, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3442 fprintf(stderr, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
d6f42150
DG		 3443 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3444 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3445 fprintf(stderr, " -V, --version Show version number.\n");
3446 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3447 fprintf(stderr, " -q, --quiet No output at all.\n");
3448 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3449 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
fac6795d
DG		 3450}
3451
3452/*
3453 * daemon argument parsing
3454 */
3455static int parse_args(int argc, char **argv)
3456{
3457 int c;
3458
3459 static struct option long_options[] = {
3460 { "client-sock", 1, 0, 'c' },
3461 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3462 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3463 { "kconsumerd-err-sock", 1, 0, 'E' },
3464 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3465 { "ustconsumerd-err-sock", 1, 0, 'F' },
fac6795d 3466 { "daemonize", 0, 0, 'd' },
5b8719f5 3467 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3468 { "help", 0, 0, 'h' },
3469 { "group", 1, 0, 'g' },
3470 { "version", 0, 0, 'V' },
75462a81 3471 { "quiet", 0, 0, 'q' },
3f9947db 3472 { "verbose", 0, 0, 'v' },
3bd1e081 3473 { "verbose-consumer", 0, 0, 'Z' },
fac6795d
DG		 3474 { NULL, 0, 0, 0 }
3475 };
3476
3477 while (1) {
3478 int option_index = 0;
3bd1e081 3479 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
54d01ffb 3480 long_options, &option_index);
fac6795d
DG		 3481 if (c == -1) {
3482 break;
3483 }
3484
3485 switch (c) {
3486 case 0:
3487 fprintf(stderr, "option %s", long_options[option_index].name);
3488 if (optarg) {
3489 fprintf(stderr, " with arg %s\n", optarg);
3490 }
3491 break;
b716ce68 3492 case 'c':
fac6795d
DG		 3493 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3494 break;
3495 case 'a':
3496 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3497 break;
3498 case 'd':
3499 opt_daemon = 1;
3500 break;
3501 case 'g':
3502 opt_tracing_group = strdup(optarg);
3503 break;
3504 case 'h':
3505 usage();
3506 exit(EXIT_FAILURE);
3507 case 'V':
3508 fprintf(stdout, "%s\n", VERSION);
3509 exit(EXIT_SUCCESS);
5b8719f5
DG		 3510 case 'S':
3511 opt_sig_parent = 1;
3512 break;
d6f42150 3513 case 'E':
3bd1e081 3514 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3515 break;
3516 case 'C':
3bd1e081
MD		 3517 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3518 break;
3519 case 'F':
3520 snprintf(ustconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3521 break;
3522 case 'D':
3523 snprintf(ustconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3524 break;
75462a81
DG		 3525 case 'q':
3526 opt_quiet = 1;
3527 break;
3f9947db 3528 case 'v':
53086306
DG		 3529 /* Verbose level can increase using multiple -v */
3530 opt_verbose += 1;
3f9947db 3531 break;
31f73cc9 3532 case 'Z':
3bd1e081 3533 opt_verbose_consumer += 1;
31f73cc9 3534 break;
fac6795d
DG		 3535 default:
3536 /* Unknown option or other error.
3537 * Error is printed by getopt, just return */
3538 return -1;
3539 }
3540 }
3541
3542 return 0;
3543}
3544
3545/*
d063d709 3546 * Creates the two needed socket by the daemon.
d6f42150
DG		 3547 * apps_sock - The communication socket for all UST apps.
3548 * client_sock - The communication of the cli tool (lttng).
fac6795d 3549 */
cf3af59e 3550static int init_daemon_socket(void)
fac6795d
DG		 3551{
3552 int ret = 0;
3553 mode_t old_umask;
3554
3555 old_umask = umask(0);
3556
3557 /* Create client tool unix socket */
d6f42150
DG		 3558 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3559 if (client_sock < 0) {
3560 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3561 ret = -1;
3562 goto end;
3563 }
3564
3565 /* File permission MUST be 660 */
3566 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3567 if (ret < 0) {
d6f42150 3568 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3569 perror("chmod");
3570 goto end;
3571 }
3572
3573 /* Create the application unix socket */
d6f42150
DG		 3574 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3575 if (apps_sock < 0) {
3576 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3577 ret = -1;
3578 goto end;
3579 }
3580
d6f42150 3581 /* File permission MUST be 666 */
54d01ffb
DG		 3582 ret = chmod(apps_unix_sock_path,
3583 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3584 if (ret < 0) {
d6f42150 3585 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3586 perror("chmod");
3587 goto end;
3588 }
3589
3590end:
3591 umask(old_umask);
3592 return ret;
3593}
3594
3595/*
54d01ffb
DG		 3596 * Check if the global socket is available, and if a daemon is answering at the
3597 * other side. If yes, error is returned.
fac6795d 3598 */
cf3af59e 3599static int check_existing_daemon(void)
fac6795d 3600{
7d8234d9 3601 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3602 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3603 return 0;
099e26bd 3604 }
54d01ffb 3605
7d8234d9 3606 /* Is there anybody out there ? */
099e26bd 3607 if (lttng_session_daemon_alive()) {
7d8234d9 3608 return -EEXIST;
099e26bd 3609 } else {
7d8234d9 3610 return 0;
099e26bd 3611 }
fac6795d
DG		 3612}
3613
fac6795d 3614/*
d063d709 3615 * Set the tracing group gid onto the client socket.
5e16da05 3616 *
d063d709
DG		 3617 * Race window between mkdir and chown is OK because we are going from more
3618 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3619 */
d6f42150 3620static int set_permissions(void)
fac6795d
DG		 3621{
3622 int ret;
996b65c8 3623 gid_t gid;
fac6795d 3624
996b65c8
MD		 3625 gid = allowed_group();
3626 if (gid < 0) {
a463f419
DG		 3627 if (is_root) {
3628 WARN("No tracing group detected");
3629 ret = 0;
3630 } else {
3631 ERR("Missing tracing group. Aborting execution.");
3632 ret = -1;
3633 }
fac6795d
DG		 3634 goto end;
3635 }
3636
d6f42150 3637 /* Set lttng run dir */
996b65c8 3638 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG		 3639 if (ret < 0) {
3640 ERR("Unable to set group on " LTTNG_RUNDIR);
3641 perror("chown");
3642 }
3643
3644 /* lttng client socket path */
996b65c8 3645 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3646 if (ret < 0) {
d6f42150
DG		 3647 ERR("Unable to set group on %s", client_unix_sock_path);
3648 perror("chown");
3649 }
3650
3bd1e081
MD		 3651 /* kconsumer error socket path */
3652 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 3653 if (ret < 0) {
3bd1e081
MD		 3654 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3655 perror("chown");
3656 }
3657
3658 /* ustconsumer error socket path */
3659 ret = chown(ustconsumer_data.err_unix_sock_path, 0, gid);
3660 if (ret < 0) {
3661 ERR("Unable to set group on %s", ustconsumer_data.err_unix_sock_path);
fac6795d
DG		 3662 perror("chown");
3663 }
3664
d6f42150 3665 DBG("All permissions are set");
e07ae692 3666
fac6795d
DG		 3667end:
3668 return ret;
3669}
3670
7a485870 3671/*
d063d709 3672 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 3673 */
3674static int create_kernel_poll_pipe(void)
3675{
3676 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3677}
3678
099e26bd
DG		 3679/*
3680 * Create the application command pipe to wake thread_manage_apps.
3681 */
3682static int create_apps_cmd_pipe(void)
3683{
3684 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3685}
3686
d6f42150 3687/*
d063d709 3688 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG		 3689 */
3690static int create_lttng_rundir(void)
3691{
3692 int ret;
3693
3694 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
3695 if (ret < 0) {
b1f11e69
DG		 3696 if (errno != EEXIST) {
3697 ERR("Unable to create " LTTNG_RUNDIR);
3698 goto error;
3699 } else {
3700 ret = 0;
3701 }
d6f42150
DG		 3702 }
3703
3704error:
3705 return ret;
3706}
3707
3708/*
d063d709
DG		 3709 * Setup sockets and directory needed by the kconsumerd communication with the
3710 * session daemon.
d6f42150 3711 */
3bd1e081 3712static int set_consumer_sockets(struct consumer_data *consumer_data)
d6f42150
DG		 3713{
3714 int ret;
3bd1e081
MD		 3715 const char *path = consumer_data->type == LTTNG_CONSUMER_KERNEL ?
3716 KCONSUMERD_PATH : USTCONSUMERD_PATH;
d6f42150 3717
3bd1e081
MD		 3718 if (strlen(consumer_data->err_unix_sock_path) == 0) {
3719 snprintf(consumer_data->err_unix_sock_path, PATH_MAX,
3720 consumer_data->type == LTTNG_CONSUMER_KERNEL ?
3721 KCONSUMERD_ERR_SOCK_PATH :
3722 USTCONSUMERD_ERR_SOCK_PATH);
d6f42150
DG		 3723 }
3724
3bd1e081
MD		 3725 if (strlen(consumer_data->cmd_unix_sock_path) == 0) {
3726 snprintf(consumer_data->cmd_unix_sock_path, PATH_MAX,
3727 consumer_data->type == LTTNG_CONSUMER_KERNEL ?
3728 KCONSUMERD_CMD_SOCK_PATH :
3729 USTCONSUMERD_CMD_SOCK_PATH);
d6f42150
DG		 3730 }
3731
3bd1e081 3732 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 3733 if (ret < 0) {
6beb2242 3734 if (errno != EEXIST) {
3bd1e081 3735 ERR("Failed to create %s", path);
6beb2242
DG		 3736 goto error;
3737 }
3738 ret = 0;
d6f42150
DG		 3739 }
3740
3741 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 3742 consumer_data->err_sock =
3743 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
3744 if (consumer_data->err_sock < 0) {
3745 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 3746 ret = -1;
3747 goto error;
3748 }
3749
3750 /* File permission MUST be 660 */
3bd1e081 3751 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 3752 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 3753 if (ret < 0) {
3bd1e081 3754 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 3755 perror("chmod");
3756 goto error;
3757 }
3758
3759error:
3760 return ret;
3761}
3762
fac6795d 3763/*
d063d709 3764 * Signal handler for the daemon
cf3af59e 3765 *
54d01ffb
DG		 3766 * Simply stop all worker threads, leaving main() return gracefully after
3767 * joining all threads and calling cleanup().
fac6795d
DG		 3768 */
3769static void sighandler(int sig)
3770{
3771 switch (sig) {
cf3af59e
MD		 3772 case SIGPIPE:
3773 DBG("SIGPIPE catched");
3774 return;
3775 case SIGINT:
3776 DBG("SIGINT catched");
3777 stop_threads();
3778 break;
3779 case SIGTERM:
3780 DBG("SIGTERM catched");
3781 stop_threads();
3782 break;
3783 default:
3784 break;
fac6795d 3785 }
fac6795d
DG		 3786}
3787
3788/*
d063d709 3789 * Setup signal handler for :
1d4b027a 3790 * SIGINT, SIGTERM, SIGPIPE
fac6795d 3791 */
1d4b027a 3792static int set_signal_handler(void)
fac6795d 3793{
1d4b027a
DG		 3794 int ret = 0;
3795 struct sigaction sa;
3796 sigset_t sigset;
fac6795d 3797
1d4b027a
DG		 3798 if ((ret = sigemptyset(&sigset)) < 0) {
3799 perror("sigemptyset");
3800 return ret;
3801 }
d6f42150 3802
1d4b027a
DG		 3803 sa.sa_handler = sighandler;
3804 sa.sa_mask = sigset;
3805 sa.sa_flags = 0;
3806 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
3807 perror("sigaction");
3808 return ret;
d6f42150
DG		 3809 }
3810
1d4b027a
DG		 3811 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
3812 perror("sigaction");
3813 return ret;
d6f42150 3814 }
aaf26714 3815
1d4b027a
DG		 3816 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3817 perror("sigaction");
3818 return ret;
8c0faa1d
DG		 3819 }
3820
1d4b027a
DG		 3821 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3822
3823 return ret;
fac6795d
DG		 3824}
3825
f3ed775e 3826/*
d063d709
DG		 3827 * Set open files limit to unlimited. This daemon can open a large number of
3828 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 3829 */
3830static void set_ulimit(void)
3831{
3832 int ret;
3833 struct rlimit lim;
3834
a88df331 3835 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 3836 lim.rlim_cur = 65535;
3837 lim.rlim_max = 65535;
3838
3839 ret = setrlimit(RLIMIT_NOFILE, &lim);
3840 if (ret < 0) {
3841 perror("failed to set open files limit");
3842 }
3843}
3844
fac6795d
DG		 3845/*
3846 * main
3847 */
3848int main(int argc, char **argv)
3849{
fac6795d
DG		 3850 int ret = 0;
3851 void *status;
b082db07 3852 const char *home_path;
fac6795d 3853
f6a9efaa
DG		 3854 rcu_register_thread();
3855
273ea72c 3856 /* Create thread quit pipe */
cf3af59e
MD		 3857 if ((ret = init_thread_quit_pipe()) < 0) {
3858 goto error;
273ea72c
DG		 3859 }
3860
fac6795d
DG		 3861 /* Parse arguments */
3862 progname = argv[0];
3863 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 3864 goto error;
fac6795d
DG		 3865 }
3866
3867 /* Daemonize */
3868 if (opt_daemon) {
53094c05
DG		 3869 ret = daemon(0, 0);
3870 if (ret < 0) {
3871 perror("daemon");
cf3af59e 3872 goto error;
53094c05 3873 }
fac6795d
DG		 3874 }
3875
3876 /* Check if daemon is UID = 0 */
3877 is_root = !getuid();
3878
fac6795d 3879 if (is_root) {
d6f42150
DG		 3880 ret = create_lttng_rundir();
3881 if (ret < 0) {
cf3af59e 3882 goto error;
d6f42150
DG		 3883 }
3884
fac6795d 3885 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 3886 snprintf(apps_unix_sock_path, PATH_MAX,
3887 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 3888 }
3889
3890 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 3891 snprintf(client_unix_sock_path, PATH_MAX,
3892 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
3893 }
0fdd1e2c
DG		 3894
3895 /* Set global SHM for ust */
3896 if (strlen(wait_shm_path) == 0) {
3897 snprintf(wait_shm_path, PATH_MAX,
3898 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
3899 }
fac6795d 3900 } else {
b082db07
DG		 3901 home_path = get_home_dir();
3902 if (home_path == NULL) {
273ea72c
DG		 3903 /* TODO: Add --socket PATH option */
3904 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 3905 ret = -EPERM;
3906 goto error;
b082db07
DG		 3907 }
3908
fac6795d 3909 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 3910 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 3911 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 3912 }
3913
3914 /* Set the cli tool unix socket path */
3915 if (strlen(client_unix_sock_path) == 0) {
d6f42150 3916 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 3917 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 3918 }
0fdd1e2c
DG		 3919
3920 /* Set global SHM for ust */
3921 if (strlen(wait_shm_path) == 0) {
3922 snprintf(wait_shm_path, PATH_MAX,
3923 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
3924 }
fac6795d
DG		 3925 }
3926
847177cd
DG		 3927 DBG("Client socket path %s", client_unix_sock_path);
3928 DBG("Application socket path %s", apps_unix_sock_path);
3929
273ea72c 3930 /*
7d8234d9 3931 * See if daemon already exist.
fac6795d 3932 */
7d8234d9 3933 if ((ret = check_existing_daemon()) < 0) {
75462a81 3934 ERR("Already running daemon.\n");
273ea72c 3935 /*
cf3af59e
MD		 3936 * We do not goto exit because we must not cleanup()
3937 * because a daemon is already running.
ab118b20 3938 */
cf3af59e 3939 goto error;
a88df331
DG		 3940 }
3941
54d01ffb 3942 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 3943
3944 /*
3945 * These actions must be executed as root. We do that *after* setting up
3946 * the sockets path because we MUST make the check for another daemon using
3947 * those paths *before* trying to set the kernel consumer sockets and init
3948 * kernel tracer.
3949 */
3950 if (is_root) {
3bd1e081
MD		 3951 ret = set_consumer_sockets(&kconsumer_data);
3952 if (ret < 0) {
3953 goto exit;
3954 }
48842b30 3955
3bd1e081 3956 ret = set_consumer_sockets(&ustconsumer_data);
a88df331 3957 if (ret < 0) {
cf3af59e 3958 goto exit;
a88df331 3959 }
a88df331
DG		 3960 /* Setup kernel tracer */
3961 init_kernel_tracer();
3962
3963 /* Set ulimit for open files */
3964 set_ulimit();
fac6795d
DG		 3965 }
3966
cf3af59e
MD		 3967 if ((ret = set_signal_handler()) < 0) {
3968 goto exit;
fac6795d
DG		 3969 }
3970
d6f42150 3971 /* Setup the needed unix socket */
cf3af59e
MD		 3972 if ((ret = init_daemon_socket()) < 0) {
3973 goto exit;
fac6795d
DG		 3974 }
3975
3976 /* Set credentials to socket */
cf3af59e
MD		 3977 if (is_root && ((ret = set_permissions()) < 0)) {
3978 goto exit;
fac6795d
DG		 3979 }
3980
5b8719f5
DG		 3981 /* Get parent pid if -S, --sig-parent is specified. */
3982 if (opt_sig_parent) {
3983 ppid = getppid();
3984 }
3985
7a485870 3986 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 3987 if ((ret = create_kernel_poll_pipe()) < 0) {
3988 goto exit;
7a485870
DG		 3989 }
3990
099e26bd
DG		 3991 /* Setup the thread apps communication pipe. */
3992 if ((ret = create_apps_cmd_pipe()) < 0) {
3993 goto exit;
3994 }
3995
3996 /* Init UST command queue. */
3997 cds_wfq_init(&ust_cmd_queue.queue);
3998
f6a9efaa
DG		 3999 /* Init UST app hash table */
4000 ust_app_ht_alloc();
4001
273ea72c 4002 /*
54d01ffb
DG		 4003 * Get session list pointer. This pointer MUST NOT be free(). This list is
4004 * statically declared in session.c
273ea72c 4005 */
54d01ffb 4006 session_list_ptr = session_get_list();
b5541356 4007
5eb91c98
DG		 4008 /* Set up max poll set size */
4009 lttng_poll_set_max_size();
4010
cf3af59e 4011 /* Create thread to manage the client socket */
099e26bd
DG		 4012 ret = pthread_create(&client_thread, NULL,
4013 thread_manage_clients, (void *) NULL);
cf3af59e 4014 if (ret != 0) {
099e26bd 4015 perror("pthread_create clients");
cf3af59e
MD		 4016 goto exit_client;
4017 }
fac6795d 4018
099e26bd
DG		 4019 /* Create thread to dispatch registration */
4020 ret = pthread_create(&dispatch_thread, NULL,
4021 thread_dispatch_ust_registration, (void *) NULL);
4022 if (ret != 0) {
4023 perror("pthread_create dispatch");
4024 goto exit_dispatch;
4025 }
4026
4027 /* Create thread to manage application registration. */
4028 ret = pthread_create(&reg_apps_thread, NULL,
4029 thread_registration_apps, (void *) NULL);
4030 if (ret != 0) {
4031 perror("pthread_create registration");
4032 goto exit_reg_apps;
4033 }
4034
cf3af59e 4035 /* Create thread to manage application socket */
54d01ffb
DG		 4036 ret = pthread_create(&apps_thread, NULL,
4037 thread_manage_apps, (void *) NULL);
cf3af59e 4038 if (ret != 0) {
099e26bd 4039 perror("pthread_create apps");
cf3af59e
MD		 4040 goto exit_apps;
4041 }
fac6795d 4042
cf3af59e 4043 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4044 ret = pthread_create(&kernel_thread, NULL,
4045 thread_manage_kernel, (void *) NULL);
cf3af59e 4046 if (ret != 0) {
099e26bd 4047 perror("pthread_create kernel");
cf3af59e
MD		 4048 goto exit_kernel;
4049 }
7a485870 4050
cf3af59e
MD		 4051 ret = pthread_join(kernel_thread, &status);
4052 if (ret != 0) {
4053 perror("pthread_join");
4054 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4055 }
4056
cf3af59e
MD		 4057exit_kernel:
4058 ret = pthread_join(apps_thread, &status);
4059 if (ret != 0) {
4060 perror("pthread_join");
4061 goto error; /* join error, exit without cleanup */
4062 }
fac6795d 4063
cf3af59e 4064exit_apps:
099e26bd
DG		 4065 ret = pthread_join(reg_apps_thread, &status);
4066 if (ret != 0) {
4067 perror("pthread_join");
4068 goto error; /* join error, exit without cleanup */
4069 }
4070
4071exit_reg_apps:
4072 ret = pthread_join(dispatch_thread, &status);
4073 if (ret != 0) {
4074 perror("pthread_join");
4075 goto error; /* join error, exit without cleanup */
4076 }
4077
4078exit_dispatch:
cf3af59e
MD		 4079 ret = pthread_join(client_thread, &status);
4080 if (ret != 0) {
4081 perror("pthread_join");
4082 goto error; /* join error, exit without cleanup */
4083 }
4084
3bd1e081 4085 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4086 if (ret != 0) {
3bd1e081 4087 perror("join_consumer");
cf3af59e
MD		 4088 goto error; /* join error, exit without cleanup */
4089 }
a88df331 4090
cf3af59e 4091exit_client:
a88df331 4092exit:
cf3af59e
MD		 4093 /*
4094 * cleanup() is called when no other thread is running.
4095 */
f6a9efaa 4096 rcu_thread_online();
cf3af59e 4097 cleanup();
f6a9efaa
DG		 4098 rcu_thread_offline();
4099 rcu_unregister_thread();
cf3af59e
MD		 4100 if (!ret)
4101 exit(EXIT_SUCCESS);
4102error:
5e16da05 4103 exit(EXIT_FAILURE);
fac6795d 4104}
LTTng tools - Deliverables
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