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Fix comments in lttng-sessiond-comm code
[lttng-tools.git] / ltt-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
DG		 38#include <unistd.h>
39
1e307fab 40#include <ltt-kconsumerd.h>
e88129fc 41#include <lttng-sessiond-comm.h>
1e307fab
DG		 42#include <lttng/lttng-kconsumerd.h>
43#include <lttngerr.h>
fac6795d 44
54d01ffb 45#include "channel.h"
5eb91c98 46#include "compat/poll.h"
099e26bd 47#include "context.h"
54d01ffb 48#include "event.h"
099e26bd 49#include "futex.h"
20fe2104 50#include "kernel-ctl.h"
1e307fab 51#include "ltt-sessiond.h"
0fdd1e2c 52#include "shm.h"
56fff090 53#include "ust-app.h"
1e307fab 54#include "ust-ctl.h"
8e68d1c8 55#include "utils.h"
0177d773 56#include "ust-ctl.h"
fac6795d 57
75462a81 58/* Const values */
686204ab 59const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 60const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD		 61const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
62const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
63
fac6795d 64/* Variables */
1d4b027a 65int opt_verbose; /* Not static for lttngerr.h */
31f73cc9 66int opt_verbose_kconsumerd; /* Not static for lttngerr.h */
1d4b027a 67int opt_quiet; /* Not static for lttngerr.h */
d063d709 68
fac6795d
DG		 69const char *progname;
70const char *opt_tracing_group;
5b8719f5 71static int opt_sig_parent;
fac6795d
DG		 72static int opt_daemon;
73static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a
DG		 74static pid_t ppid; /* Parent PID for --sig-parent option */
75static pid_t kconsumerd_pid;
099e26bd 76static int dispatch_thread_exit;
fac6795d 77
54d01ffb
DG		 78/* Global application Unix socket path */
79static char apps_unix_sock_path[PATH_MAX];
80/* Global client Unix socket path */
81static char client_unix_sock_path[PATH_MAX];
82/* kconsumerd error and command Unix socket path */
83static char kconsumerd_err_unix_sock_path[PATH_MAX];
84static char kconsumerd_cmd_unix_sock_path[PATH_MAX];
85/* global wait shm path for UST */
86static char wait_shm_path[PATH_MAX];
fac6795d 87
1d4b027a 88/* Sockets and FDs */
d6f42150
DG		 89static int client_sock;
90static int apps_sock;
91static int kconsumerd_err_sock;
8c0faa1d 92static int kconsumerd_cmd_sock;
20fe2104 93static int kernel_tracer_fd;
7a485870 94static int kernel_poll_pipe[2];
1d4b027a 95
273ea72c
DG		 96/*
97 * Quit pipe for all threads. This permits a single cancellation point
98 * for all threads when receiving an event on the pipe.
99 */
100static int thread_quit_pipe[2];
101
099e26bd
DG		 102/*
103 * This pipe is used to inform the thread managing application communication
104 * that a command is queued and ready to be processed.
105 */
106static int apps_cmd_pipe[2];
107
1d4b027a 108/* Pthread, Mutexes and Semaphores */
8c0faa1d 109static pthread_t kconsumerd_thread;
1d4b027a 110static pthread_t apps_thread;
099e26bd 111static pthread_t reg_apps_thread;
1d4b027a 112static pthread_t client_thread;
7a485870 113static pthread_t kernel_thread;
099e26bd 114static pthread_t dispatch_thread;
8c0faa1d
DG		 115static sem_t kconsumerd_sem;
116
5eb91c98
DG		 117
118/* Mutex to control kconsumerd pid assignation */
119static pthread_mutex_t kconsumerd_pid_mutex;
fac6795d 120
099e26bd
DG		 121/*
122 * UST registration command queue. This queue is tied with a futex and uses a N
123 * wakers / 1 waiter implemented and detailed in futex.c/.h
124 *
125 * The thread_manage_apps and thread_dispatch_ust_registration interact with
126 * this queue and the wait/wake scheme.
127 */
128static struct ust_cmd_queue ust_cmd_queue;
129
b5541356
DG		 130/*
131 * Pointer initialized before thread creation.
132 *
133 * This points to the tracing session list containing the session count and a
134 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
135 * MUST NOT be taken if you call a public function in session.c.
04ea676f 136 *
d063d709 137 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 138 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 139 */
140static struct ltt_session_list *session_list_ptr;
141
5eb91c98
DG		 142/*
143 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
144 */
145static int create_thread_poll_set(struct lttng_poll_event *events,
146 unsigned int size)
147{
148 int ret;
149
150 if (events == NULL || size == 0) {
151 ret = -1;
152 goto error;
153 }
154
155 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
156 if (ret < 0) {
157 goto error;
158 }
159
160 /* Add quit pipe */
161 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
162 if (ret < 0) {
163 goto error;
164 }
165
166 return 0;
167
168error:
169 return ret;
170}
171
172/*
173 * Check if the thread quit pipe was triggered.
174 *
175 * Return 1 if it was triggered else 0;
176 */
177static int check_thread_quit_pipe(int fd, uint32_t events)
178{
179 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
180 return 1;
181 }
182
183 return 0;
184}
185
0fdd1e2c
DG		 186/*
187 * Remove modules in reverse load order.
188 */
189static int modprobe_remove_kernel_modules(void)
190{
191 int ret = 0, i;
192 char modprobe[256];
193
194 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
195 ret = snprintf(modprobe, sizeof(modprobe),
196 "/sbin/modprobe --remove --quiet %s",
197 kernel_modules_list[i].name);
198 if (ret < 0) {
199 perror("snprintf modprobe --remove");
200 goto error;
201 }
202 modprobe[sizeof(modprobe) - 1] = '\0';
203 ret = system(modprobe);
204 if (ret == -1) {
205 ERR("Unable to launch modprobe --remove for module %s",
206 kernel_modules_list[i].name);
207 } else if (kernel_modules_list[i].required
208 && WEXITSTATUS(ret) != 0) {
209 ERR("Unable to remove module %s",
210 kernel_modules_list[i].name);
211 } else {
212 DBG("Modprobe removal successful %s",
213 kernel_modules_list[i].name);
214 }
215 }
216
217error:
218 return ret;
219}
220
221/*
222 * Return group ID of the tracing group or -1 if not found.
223 */
996b65c8
MD		 224static gid_t allowed_group(void)
225{
226 struct group *grp;
227
274e143b
MD		 228 if (opt_tracing_group) {
229 grp = getgrnam(opt_tracing_group);
230 } else {
231 grp = getgrnam(default_tracing_group);
232 }
996b65c8
MD		 233 if (!grp) {
234 return -1;
235 } else {
236 return grp->gr_gid;
237 }
238}
239
273ea72c 240/*
5eb91c98 241 * Init thread quit pipe.
273ea72c
DG		 242 *
243 * Return -1 on error or 0 if all pipes are created.
244 */
245static int init_thread_quit_pipe(void)
246{
247 int ret;
248
249 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
250 if (ret < 0) {
251 perror("thread quit pipe");
252 goto error;
253 }
254
255error:
256 return ret;
257}
258
fac6795d 259/*
d063d709
DG		 260 * Complete teardown of a kernel session. This free all data structure related
261 * to a kernel session and update counter.
fac6795d 262 */
1d4b027a 263static void teardown_kernel_session(struct ltt_session *session)
fac6795d 264{
1d4b027a
DG		 265 if (session->kernel_session != NULL) {
266 DBG("Tearing down kernel session");
d9800920
DG		 267
268 /*
269 * If a custom kernel consumer was registered, close the socket before
270 * tearing down the complete kernel session structure
271 */
272 if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) {
273 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
274 }
275
62499ad6 276 trace_kernel_destroy_session(session->kernel_session);
1d4b027a
DG		 277 /* Extra precaution */
278 session->kernel_session = NULL;
fac6795d 279 }
fac6795d
DG		 280}
281
099e26bd
DG		 282/*
283 * Stop all threads by closing the thread quit pipe.
284 */
cf3af59e
MD		 285static void stop_threads(void)
286{
5eb91c98
DG		 287 int ret;
288
cf3af59e
MD		 289 /* Stopping all threads */
290 DBG("Terminating all threads");
54d01ffb 291 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 292 if (ret < 0) {
293 ERR("write error on thread quit pipe");
294 }
295
099e26bd
DG		 296 /* Dispatch thread */
297 dispatch_thread_exit = 1;
298 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 299}
300
fac6795d 301/*
d063d709 302 * Cleanup the daemon
fac6795d 303 */
cf3af59e 304static void cleanup(void)
fac6795d 305{
1d4b027a
DG		 306 int ret;
307 char *cmd;
af9737e9 308 struct ltt_session *sess, *stmp;
fac6795d 309
1d4b027a 310 DBG("Cleaning up");
e07ae692 311
1d4b027a 312 /* <fun> */
2f50c8a3 313 MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
273ea72c
DG		 314 "Matthew, BEET driven development works!%c[%dm",
315 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
1d4b027a 316 /* </fun> */
fac6795d 317
5eb91c98
DG		 318 if (is_root) {
319 DBG("Removing %s directory", LTTNG_RUNDIR);
320 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
321 if (ret < 0) {
322 ERR("asprintf failed. Something is really wrong!");
323 }
5461b305 324
5eb91c98
DG		 325 /* Remove lttng run directory */
326 ret = system(cmd);
327 if (ret < 0) {
328 ERR("Unable to clean " LTTNG_RUNDIR);
329 }
1d4b027a 330 }
5461b305 331
1d4b027a 332 DBG("Cleaning up all session");
fac6795d 333
b5541356 334 /* Destroy session list mutex */
273ea72c
DG		 335 if (session_list_ptr != NULL) {
336 pthread_mutex_destroy(&session_list_ptr->lock);
337
338 /* Cleanup ALL session */
54d01ffb
DG		 339 cds_list_for_each_entry_safe(sess, stmp,
340 &session_list_ptr->head, list) {
273ea72c
DG		 341 teardown_kernel_session(sess);
342 // TODO complete session cleanup (including UST)
343 }
344 }
345
099e26bd 346 DBG("Closing all UST sockets");
56fff090 347 ust_app_clean_list();
099e26bd 348
273ea72c 349 pthread_mutex_destroy(&kconsumerd_pid_mutex);
b5541356 350
f3ed775e 351 DBG("Closing kernel fd");
1d4b027a 352 close(kernel_tracer_fd);
ab147185 353
2f50c8a3
DG		 354 if (is_root) {
355 DBG("Unloading kernel modules");
356 modprobe_remove_kernel_modules();
357 }
5eb91c98
DG		 358
359 close(thread_quit_pipe[0]);
360 close(thread_quit_pipe[1]);
fac6795d
DG		 361}
362
e065084a 363/*
d063d709 364 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 365 *
d063d709 366 * Return lttcomm error code.
e065084a
DG		 367 */
368static int send_unix_sock(int sock, void *buf, size_t len)
369{
370 /* Check valid length */
371 if (len <= 0) {
372 return -1;
373 }
374
375 return lttcomm_send_unix_sock(sock, buf, len);
376}
377
5461b305 378/*
d063d709 379 * Free memory of a command context structure.
5461b305 380 */
a2fb29a5 381static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 382{
a2fb29a5
DG		 383 DBG("Clean command context structure");
384 if (*cmd_ctx) {
385 if ((*cmd_ctx)->llm) {
386 free((*cmd_ctx)->llm);
5461b305 387 }
a2fb29a5
DG		 388 if ((*cmd_ctx)->lsm) {
389 free((*cmd_ctx)->lsm);
5461b305 390 }
a2fb29a5
DG		 391 free(*cmd_ctx);
392 *cmd_ctx = NULL;
5461b305
DG		 393 }
394}
395
f3ed775e 396/*
d063d709 397 * Send all stream fds of kernel channel to the consumer.
f3ed775e 398 */
54d01ffb
DG		 399static int send_kconsumerd_channel_fds(int sock,
400 struct ltt_kernel_channel *channel)
f3ed775e
DG		 401{
402 int ret;
403 size_t nb_fd;
404 struct ltt_kernel_stream *stream;
f3ed775e
DG		 405 struct lttcomm_kconsumerd_header lkh;
406 struct lttcomm_kconsumerd_msg lkm;
407
54d01ffb
DG		 408 DBG("Sending fds of channel %s to kernel consumer",
409 channel->channel->name);
7a485870
DG		 410
411 nb_fd = channel->stream_count;
f3ed775e
DG		 412
413 /* Setup header */
7a485870 414 lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg);
f3ed775e
DG		 415 lkh.cmd_type = ADD_STREAM;
416
417 DBG("Sending kconsumerd header");
418
54d01ffb
DG		 419 ret = lttcomm_send_unix_sock(sock, &lkh,
420 sizeof(struct lttcomm_kconsumerd_header));
f3ed775e
DG		 421 if (ret < 0) {
422 perror("send kconsumerd header");
423 goto error;
424 }
425
7a485870
DG		 426 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
427 if (stream->fd != 0) {
f3ed775e
DG		 428 lkm.fd = stream->fd;
429 lkm.state = stream->state;
7a485870 430 lkm.max_sb_size = channel->channel->attr.subbuf_size;
e8b60857 431 lkm.output = channel->channel->attr.output;
f3ed775e 432 strncpy(lkm.path_name, stream->pathname, PATH_MAX);
99497cd0 433 lkm.path_name[PATH_MAX - 1] = '\0';
f3ed775e
DG		 434
435 DBG("Sending fd %d to kconsumerd", lkm.fd);
436
54d01ffb
DG		 437 ret = lttcomm_send_fds_unix_sock(sock, &lkm,
438 &lkm.fd, 1, sizeof(lkm));
f3ed775e
DG		 439 if (ret < 0) {
440 perror("send kconsumerd fd");
441 goto error;
442 }
443 }
444 }
445
7a485870 446 DBG("Kconsumerd channel fds sent");
f3ed775e
DG		 447
448 return 0;
449
450error:
451 return ret;
452}
453
454/*
d063d709 455 * Send all stream fds of the kernel session to the consumer.
f3ed775e 456 */
d9800920 457static int send_kconsumerd_fds(struct ltt_kernel_session *session)
f3ed775e
DG		 458{
459 int ret;
460 struct ltt_kernel_channel *chan;
7a485870
DG		 461 struct lttcomm_kconsumerd_header lkh;
462 struct lttcomm_kconsumerd_msg lkm;
463
464 /* Setup header */
465 lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg);
466 lkh.cmd_type = ADD_STREAM;
467
468 DBG("Sending kconsumerd header for metadata");
469
54d01ffb
DG		 470 ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh,
471 sizeof(struct lttcomm_kconsumerd_header));
7a485870
DG		 472 if (ret < 0) {
473 perror("send kconsumerd header");
474 goto error;
475 }
476
477 DBG("Sending metadata stream fd");
478
d9800920
DG		 479 /* Extra protection. It's NOT suppose to be set to 0 at this point */
480 if (session->consumer_fd == 0) {
481 session->consumer_fd = kconsumerd_cmd_sock;
482 }
483
7a485870
DG		 484 if (session->metadata_stream_fd != 0) {
485 /* Send metadata stream fd first */
486 lkm.fd = session->metadata_stream_fd;
487 lkm.state = ACTIVE_FD;
488 lkm.max_sb_size = session->metadata->conf->attr.subbuf_size;
8b270bdb 489 lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
7a485870 490 strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
99497cd0 491 lkm.path_name[PATH_MAX - 1] = '\0';
7a485870 492
54d01ffb
DG		 493 ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm,
494 &lkm.fd, 1, sizeof(lkm));
7a485870
DG		 495 if (ret < 0) {
496 perror("send kconsumerd fd");
497 goto error;
498 }
499 }
f3ed775e 500
f3ed775e 501 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
d9800920 502 ret = send_kconsumerd_channel_fds(session->consumer_fd, chan);
f3ed775e 503 if (ret < 0) {
7a485870 504 goto error;
f3ed775e
DG		 505 }
506 }
507
7a485870
DG		 508 DBG("Kconsumerd fds (metadata and channel streams) sent");
509
f3ed775e
DG		 510 return 0;
511
512error:
513 return ret;
514}
515
fac6795d 516/*
0fdd1e2c 517 * Notify UST applications using the shm mmap futex.
fac6795d 518 */
0fdd1e2c 519static int notify_ust_apps(int active)
fac6795d 520{
0fdd1e2c 521 char *wait_shm_mmap;
fac6795d 522
0fdd1e2c 523 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 524
0fdd1e2c
DG		 525 /* See shm.c for this call implying mmap, shm and futex calls */
526 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
527 if (wait_shm_mmap == NULL) {
fac6795d
DG		 528 goto error;
529 }
530
0fdd1e2c
DG		 531 /* Wake waiting process */
532 futex_wait_update((int32_t *) wait_shm_mmap, active);
533
534 /* Apps notified successfully */
535 return 0;
fac6795d
DG		 536
537error:
0fdd1e2c 538 return -1;
fac6795d
DG		 539}
540
e065084a 541/*
d063d709
DG		 542 * Setup the outgoing data buffer for the response (llm) by allocating the
543 * right amount of memory and copying the original information from the lsm
544 * structure.
ca95a216 545 *
d063d709 546 * Return total size of the buffer pointed by buf.
ca95a216 547 */
5461b305 548static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 549{
f3ed775e 550 int ret, buf_size;
ca95a216 551
f3ed775e 552 buf_size = size;
5461b305
DG		 553
554 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
555 if (cmd_ctx->llm == NULL) {
ca95a216 556 perror("malloc");
5461b305 557 ret = -ENOMEM;
ca95a216
DG		 558 goto error;
559 }
560
5461b305
DG		 561 /* Copy common data */
562 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 563 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 564
5461b305
DG		 565 cmd_ctx->llm->data_size = size;
566 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
567
ca95a216
DG		 568 return buf_size;
569
570error:
571 return ret;
572}
573
7a485870 574/*
5eb91c98 575 * Update the kernel poll set of all channel fd available over all tracing
d063d709 576 * session. Add the wakeup pipe at the end of the set.
7a485870 577 */
5eb91c98 578static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 579{
5eb91c98 580 int ret;
7a485870
DG		 581 struct ltt_session *session;
582 struct ltt_kernel_channel *channel;
583
5eb91c98 584 DBG("Updating kernel poll set");
7a485870 585
54d01ffb 586 session_lock_list();
b5541356 587 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 588 session_lock(session);
7a485870 589 if (session->kernel_session == NULL) {
54d01ffb 590 session_unlock(session);
7a485870
DG		 591 continue;
592 }
7a485870 593
54d01ffb
DG		 594 cds_list_for_each_entry(channel,
595 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 596 /* Add channel fd to the kernel poll set */
597 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
598 if (ret < 0) {
54d01ffb 599 session_unlock(session);
5eb91c98
DG		 600 goto error;
601 }
602 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 603 }
54d01ffb 604 session_unlock(session);
7a485870 605 }
54d01ffb 606 session_unlock_list();
7a485870 607
5eb91c98 608 return 0;
7a485870
DG		 609
610error:
54d01ffb 611 session_unlock_list();
7a485870
DG		 612 return -1;
613}
614
615/*
54d01ffb 616 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 617 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 618 *
d063d709 619 * Useful for CPU hotplug feature.
7a485870
DG		 620 */
621static int update_kernel_stream(int fd)
622{
623 int ret = 0;
624 struct ltt_session *session;
625 struct ltt_kernel_channel *channel;
626
627 DBG("Updating kernel streams for channel fd %d", fd);
628
54d01ffb 629 session_lock_list();
b5541356 630 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 631 session_lock(session);
7a485870 632 if (session->kernel_session == NULL) {
54d01ffb 633 session_unlock(session);
7a485870
DG		 634 continue;
635 }
d9800920
DG		 636
637 /* This is not suppose to be 0 but this is an extra security check */
638 if (session->kernel_session->consumer_fd == 0) {
639 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
640 }
641
5eb91c98
DG		 642 cds_list_for_each_entry(channel,
643 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 644 if (channel->fd == fd) {
645 DBG("Channel found, updating kernel streams");
646 ret = kernel_open_channel_stream(channel);
647 if (ret < 0) {
b3c750d2 648 goto error;
7a485870 649 }
d9800920 650
7a485870 651 /*
5eb91c98
DG		 652 * Have we already sent fds to the consumer? If yes, it means
653 * that tracing is started so it is safe to send our updated
654 * stream fds.
7a485870
DG		 655 */
656 if (session->kernel_session->kconsumer_fds_sent == 1) {
5eb91c98
DG		 657 ret = send_kconsumerd_channel_fds(
658 session->kernel_session->consumer_fd, channel);
7a485870 659 if (ret < 0) {
b3c750d2 660 goto error;
7a485870
DG		 661 }
662 }
b3c750d2 663 goto error;
7a485870
DG		 664 }
665 }
54d01ffb 666 session_unlock(session);
7a485870 667 }
54d01ffb 668 session_unlock_list();
b3c750d2 669 return ret;
7a485870 670
b3c750d2 671error:
54d01ffb
DG		 672 session_unlock(session);
673 session_unlock_list();
7a485870
DG		 674 return ret;
675}
676
677/*
d063d709 678 * This thread manage event coming from the kernel.
7a485870 679 *
d063d709
DG		 680 * Features supported in this thread:
681 * -) CPU Hotplug
7a485870
DG		 682 */
683static void *thread_manage_kernel(void *data)
684{
5eb91c98
DG		 685 int ret, i, pollfd, update_poll_flag = 1;
686 uint32_t revents, nb_fd;
7a485870 687 char tmp;
5eb91c98 688 struct lttng_poll_event events;
7a485870
DG		 689
690 DBG("Thread manage kernel started");
691
5eb91c98
DG		 692 ret = create_thread_poll_set(&events, 2);
693 if (ret < 0) {
694 goto error;
695 }
696
697 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
698 if (ret < 0) {
699 goto error;
700 }
701
7a485870
DG		 702 while (1) {
703 if (update_poll_flag == 1) {
5f822d0a
DG		 704 /*
705 * Reset number of fd in the poll set. Always 2 since there is the thread
706 * quit pipe and the kernel pipe.
707 */
708 events.nb_fd = 2;
709
5eb91c98
DG		 710 ret = update_kernel_poll(&events);
711 if (ret < 0) {
7a485870
DG		 712 goto error;
713 }
714 update_poll_flag = 0;
715 }
716
5eb91c98
DG		 717 nb_fd = LTTNG_POLL_GETNB(&events);
718
719 DBG("Thread kernel polling on %d fds", nb_fd);
720
721 /* Zeroed the poll events */
722 lttng_poll_reset(&events);
7a485870
DG		 723
724 /* Poll infinite value of time */
5eb91c98 725 ret = lttng_poll_wait(&events, -1);
7a485870 726 if (ret < 0) {
7a485870
DG		 727 goto error;
728 } else if (ret == 0) {
729 /* Should not happen since timeout is infinite */
85611738
DG		 730 ERR("Return value of poll is 0 with an infinite timeout.\n"
731 "This should not have happened! Continuing...");
7a485870
DG		 732 continue;
733 }
734
5eb91c98
DG		 735 for (i = 0; i < nb_fd; i++) {
736 /* Fetch once the poll data */
737 revents = LTTNG_POLL_GETEV(&events, i);
738 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 739
5eb91c98
DG		 740 /* Thread quit pipe has been closed. Killing thread. */
741 ret = check_thread_quit_pipe(pollfd, revents);
742 if (ret) {
743 goto error;
744 }
7a485870 745
5eb91c98
DG		 746 /* Check for data on kernel pipe */
747 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
748 ret = read(kernel_poll_pipe[0], &tmp, 1);
749 update_poll_flag = 1;
750 continue;
751 } else {
752 /*
753 * New CPU detected by the kernel. Adding kernel stream to
754 * kernel session and updating the kernel consumer
755 */
756 if (revents & LPOLLIN) {
757 ret = update_kernel_stream(pollfd);
758 if (ret < 0) {
759 continue;
760 }
761 break;
762 /*
763 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
764 * and unregister kernel stream at this point.
765 */
7a485870 766 }
7a485870
DG		 767 }
768 }
769 }
770
771error:
772 DBG("Kernel thread dying");
273ea72c
DG		 773 close(kernel_poll_pipe[0]);
774 close(kernel_poll_pipe[1]);
5eb91c98
DG		 775
776 lttng_poll_clean(&events);
777
7a485870
DG		 778 return NULL;
779}
780
1d4b027a 781/*
d063d709 782 * This thread manage the kconsumerd error sent back to the session daemon.
1d4b027a
DG		 783 */
784static void *thread_manage_kconsumerd(void *data)
785{
5eb91c98
DG		 786 int sock = 0, i, ret, pollfd;
787 uint32_t revents, nb_fd;
1d4b027a 788 enum lttcomm_return_code code;
5eb91c98 789 struct lttng_poll_event events;
1d4b027a
DG		 790
791 DBG("[thread] Manage kconsumerd started");
792
793 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
794 if (ret < 0) {
795 goto error;
796 }
797
5eb91c98
DG		 798 /*
799 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
800 * Nothing more will be added to this poll set.
801 */
802 ret = create_thread_poll_set(&events, 2);
803 if (ret < 0) {
804 goto error;
805 }
273ea72c 806
5eb91c98
DG		 807 ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP);
808 if (ret < 0) {
809 goto error;
810 }
811
812 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 813
814 /* Inifinite blocking call, waiting for transmission */
5eb91c98 815 ret = lttng_poll_wait(&events, -1);
273ea72c 816 if (ret < 0) {
273ea72c
DG		 817 goto error;
818 }
819
5eb91c98
DG		 820 for (i = 0; i < nb_fd; i++) {
821 /* Fetch once the poll data */
822 revents = LTTNG_POLL_GETEV(&events, i);
823 pollfd = LTTNG_POLL_GETFD(&events, i);
824
825 /* Thread quit pipe has been closed. Killing thread. */
826 ret = check_thread_quit_pipe(pollfd, revents);
827 if (ret) {
828 goto error;
829 }
830
831 /* Event on the registration socket */
832 if (pollfd == kconsumerd_err_sock) {
833 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
834 ERR("Kconsumerd err socket poll error");
835 goto error;
836 }
837 }
273ea72c
DG		 838 }
839
1d4b027a
DG		 840 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
841 if (sock < 0) {
842 goto error;
843 }
844
ee0b0061
DG		 845 DBG2("Receiving code from kconsumerd_err_sock");
846
712ea556 847 /* Getting status code from kconsumerd */
54d01ffb
DG		 848 ret = lttcomm_recv_unix_sock(sock, &code,
849 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 850 if (ret <= 0) {
851 goto error;
852 }
853
854 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
54d01ffb
DG		 855 kconsumerd_cmd_sock =
856 lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
1d4b027a 857 if (kconsumerd_cmd_sock < 0) {
712ea556 858 sem_post(&kconsumerd_sem);
1d4b027a
DG		 859 perror("kconsumerd connect");
860 goto error;
861 }
862 /* Signal condition to tell that the kconsumerd is ready */
863 sem_post(&kconsumerd_sem);
864 DBG("Kconsumerd command socket ready");
865 } else {
ee0b0061 866 ERR("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG		 867 lttcomm_get_readable_code(-code));
868 goto error;
869 }
870
54d01ffb 871 /* Remove the kconsumerd error sock since we've established a connexion */
5eb91c98 872 ret = lttng_poll_del(&events, kconsumerd_err_sock);
72079cae 873 if (ret < 0) {
72079cae
DG		 874 goto error;
875 }
876
5eb91c98
DG		 877 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
878 if (ret < 0) {
72079cae 879 goto error;
5eb91c98
DG		 880 }
881
882 /* Update number of fd */
883 nb_fd = LTTNG_POLL_GETNB(&events);
884
885 /* Inifinite blocking call, waiting for transmission */
886 ret = lttng_poll_wait(&events, -1);
887 if (ret < 0) {
72079cae
DG		 888 goto error;
889 }
890
5eb91c98
DG		 891 for (i = 0; i < nb_fd; i++) {
892 /* Fetch once the poll data */
893 revents = LTTNG_POLL_GETEV(&events, i);
894 pollfd = LTTNG_POLL_GETFD(&events, i);
895
896 /* Thread quit pipe has been closed. Killing thread. */
897 ret = check_thread_quit_pipe(pollfd, revents);
898 if (ret) {
899 goto error;
900 }
901
902 /* Event on the kconsumerd socket */
903 if (pollfd == sock) {
904 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
905 ERR("Kconsumerd err socket second poll error");
906 goto error;
907 }
908 }
909 }
910
712ea556 911 /* Wait for any kconsumerd error */
54d01ffb
DG		 912 ret = lttcomm_recv_unix_sock(sock, &code,
913 sizeof(enum lttcomm_return_code));
712ea556
DG		 914 if (ret <= 0) {
915 ERR("Kconsumerd closed the command socket");
916 goto error;
6f61d021 917 }
1d4b027a 918
712ea556
DG		 919 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
920
1d4b027a 921error:
6f61d021 922 DBG("Kconsumerd thread dying");
5eb91c98
DG		 923 close(kconsumerd_err_sock);
924 close(kconsumerd_cmd_sock);
925 close(sock);
273ea72c
DG		 926
927 unlink(kconsumerd_err_unix_sock_path);
928 unlink(kconsumerd_cmd_unix_sock_path);
273ea72c 929 kconsumerd_pid = 0;
1d4b027a 930
5eb91c98 931 lttng_poll_clean(&events);
0177d773 932
5eb91c98 933 return NULL;
099e26bd
DG		 934}
935
099e26bd
DG		 936/*
937 * This thread manage application communication.
1d4b027a
DG		 938 */
939static void *thread_manage_apps(void *data)
099e26bd 940{
5eb91c98
DG		 941 int i, ret, pollfd;
942 uint32_t revents, nb_fd;
099e26bd 943 struct ust_command ust_cmd;
5eb91c98 944 struct lttng_poll_event events;
099e26bd
DG		 945
946 DBG("[thread] Manage application started");
947
5eb91c98
DG		 948 ret = create_thread_poll_set(&events, 2);
949 if (ret < 0) {
950 goto error;
951 }
099e26bd 952
5eb91c98
DG		 953 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
954 if (ret < 0) {
955 goto error;
956 }
099e26bd 957
5eb91c98
DG		 958 while (1) {
959 /* Zeroed the events structure */
960 lttng_poll_reset(&events);
0177d773 961
5eb91c98 962 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 963
964 DBG("Apps thread polling on %d fds", nb_fd);
965
966 /* Inifinite blocking call, waiting for transmission */
5eb91c98 967 ret = lttng_poll_wait(&events, -1);
099e26bd 968 if (ret < 0) {
099e26bd
DG		 969 goto error;
970 }
971
5eb91c98
DG		 972 for (i = 0; i < nb_fd; i++) {
973 /* Fetch once the poll data */
974 revents = LTTNG_POLL_GETEV(&events, i);
975 pollfd = LTTNG_POLL_GETFD(&events, i);
976
977 /* Thread quit pipe has been closed. Killing thread. */
978 ret = check_thread_quit_pipe(pollfd, revents);
979 if (ret) {
099e26bd 980 goto error;
5eb91c98 981 }
099e26bd 982
5eb91c98
DG		 983 /* Inspect the apps cmd pipe */
984 if (pollfd == apps_cmd_pipe[0]) {
985 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
986 ERR("Apps command pipe error");
0177d773 987 goto error;
5eb91c98
DG		 988 } else if (revents & LPOLLIN) {
989 /* Empty pipe */
990 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
991 if (ret < 0 || ret < sizeof(ust_cmd)) {
992 perror("read apps cmd pipe");
993 goto error;
994 }
099e26bd 995
5eb91c98 996 /* Register applicaton to the session daemon */
56fff090 997 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 998 ust_cmd.sock);
5eb91c98
DG		 999 if (ret < 0) {
1000 /* Only critical ENOMEM error can be returned here */
1001 goto error;
1002 }
1003
1004 ret = ustctl_register_done(ust_cmd.sock);
1005 if (ret < 0) {
1006 /*
1007 * If the registration is not possible, we simply
1008 * unregister the apps and continue
1009 */
56fff090 1010 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1011 } else {
1012 /*
1013 * We just need here to monitor the close of the UST
1014 * socket and poll set monitor those by default.
1015 */
1016 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1017 if (ret < 0) {
1018 goto error;
1019 }
1020
54d01ffb
DG		 1021 DBG("Apps with sock %d added to poll set",
1022 ust_cmd.sock);
5eb91c98
DG		 1023 }
1024 break;
0177d773 1025 }
5eb91c98
DG		 1026 } else {
1027 /*
54d01ffb
DG		 1028 * At this point, we know that a registered application made
1029 * the event at poll_wait.
5eb91c98
DG		 1030 */
1031 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1032 /* Removing from the poll set */
1033 ret = lttng_poll_del(&events, pollfd);
1034 if (ret < 0) {
1035 goto error;
1036 }
099e26bd 1037
5eb91c98 1038 /* Socket closed */
56fff090 1039 ust_app_unregister(pollfd);
5eb91c98
DG		 1040 break;
1041 }
099e26bd
DG		 1042 }
1043 }
099e26bd
DG		 1044 }
1045
1046error:
1047 DBG("Application communication apps dying");
1048 close(apps_cmd_pipe[0]);
1049 close(apps_cmd_pipe[1]);
1050
5eb91c98 1051 lttng_poll_clean(&events);
099e26bd
DG		 1052
1053 return NULL;
1054}
1055
1056/*
1057 * Dispatch request from the registration threads to the application
1058 * communication thread.
1059 */
1060static void *thread_dispatch_ust_registration(void *data)
1061{
1062 int ret;
1063 struct cds_wfq_node *node;
1064 struct ust_command *ust_cmd = NULL;
1065
1066 DBG("[thread] Dispatch UST command started");
1067
1068 while (!dispatch_thread_exit) {
1069 /* Atomically prepare the queue futex */
1070 futex_nto1_prepare(&ust_cmd_queue.futex);
1071
1072 do {
1073 /* Dequeue command for registration */
1074 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1075 if (node == NULL) {
1076 DBG("Waked up but nothing in the UST command queue");
1077 /* Continue thread execution */
1078 break;
1079 }
1080
1081 ust_cmd = caa_container_of(node, struct ust_command, node);
1082
2f50c8a3
DG		 1083 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1084 " gid:%d sock:%d name:%s (version %d.%d)",
1085 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1086 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1087 ust_cmd->sock, ust_cmd->reg_msg.name,
1088 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1089 /*
1090 * Inform apps thread of the new application registration. This
1091 * call is blocking so we can be assured that the data will be read
1092 * at some point in time or wait to the end of the world :)
1093 */
1094 ret = write(apps_cmd_pipe[1], ust_cmd,
1095 sizeof(struct ust_command));
1096 if (ret < 0) {
1097 perror("write apps cmd pipe");
1098 if (errno == EBADF) {
1099 /*
1100 * We can't inform the application thread to process
1101 * registration. We will exit or else application
1102 * registration will not occur and tracing will never
1103 * start.
1104 */
1105 goto error;
1106 }
1107 }
1108 free(ust_cmd);
1109 } while (node != NULL);
1110
1111 /* Futex wait on queue. Blocking call on futex() */
1112 futex_nto1_wait(&ust_cmd_queue.futex);
1113 }
1114
1115error:
1116 DBG("Dispatch thread dying");
1117 return NULL;
1118}
1119
1120/*
1121 * This thread manage application registration.
1122 */
1123static void *thread_registration_apps(void *data)
1d4b027a 1124{
5eb91c98
DG		 1125 int sock = 0, i, ret, pollfd;
1126 uint32_t revents, nb_fd;
1127 struct lttng_poll_event events;
099e26bd
DG		 1128 /*
1129 * Get allocated in this thread, enqueued to a global queue, dequeued and
1130 * freed in the manage apps thread.
1131 */
1132 struct ust_command *ust_cmd = NULL;
1d4b027a 1133
099e26bd 1134 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1135
1136 ret = lttcomm_listen_unix_sock(apps_sock);
1137 if (ret < 0) {
1138 goto error;
1139 }
1140
5eb91c98
DG		 1141 /*
1142 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1143 * more will be added to this poll set.
1144 */
1145 ret = create_thread_poll_set(&events, 2);
1146 if (ret < 0) {
1147 goto error;
1148 }
273ea72c 1149
5eb91c98
DG		 1150 /* Add the application registration socket */
1151 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1152 if (ret < 0) {
1153 goto error;
1154 }
273ea72c 1155
1d4b027a 1156 /* Notify all applications to register */
0fdd1e2c
DG		 1157 ret = notify_ust_apps(1);
1158 if (ret < 0) {
1159 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1160 "Execution continues but there might be problem for already\n"
1161 "running applications that wishes to register.");
0fdd1e2c 1162 }
1d4b027a
DG		 1163
1164 while (1) {
1165 DBG("Accepting application registration");
273ea72c 1166
5eb91c98
DG		 1167 nb_fd = LTTNG_POLL_GETNB(&events);
1168
273ea72c 1169 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1170 ret = lttng_poll_wait(&events, -1);
273ea72c 1171 if (ret < 0) {
273ea72c
DG		 1172 goto error;
1173 }
1174
5eb91c98
DG		 1175 for (i = 0; i < nb_fd; i++) {
1176 /* Fetch once the poll data */
1177 revents = LTTNG_POLL_GETEV(&events, i);
1178 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1179
5eb91c98
DG		 1180 /* Thread quit pipe has been closed. Killing thread. */
1181 ret = check_thread_quit_pipe(pollfd, revents);
1182 if (ret) {
90014c57
DG		 1183 goto error;
1184 }
1d4b027a 1185
5eb91c98
DG		 1186 /* Event on the registration socket */
1187 if (pollfd == apps_sock) {
1188 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1189 ERR("Register apps socket poll error");
1190 goto error;
1191 } else if (revents & LPOLLIN) {
1192 sock = lttcomm_accept_unix_sock(apps_sock);
1193 if (sock < 0) {
1194 goto error;
1195 }
099e26bd 1196
5eb91c98
DG		 1197 /* Create UST registration command for enqueuing */
1198 ust_cmd = malloc(sizeof(struct ust_command));
1199 if (ust_cmd == NULL) {
1200 perror("ust command malloc");
1201 goto error;
1202 }
1d4b027a 1203
5eb91c98
DG		 1204 /*
1205 * Using message-based transmissions to ensure we don't
1206 * have to deal with partially received messages.
1207 */
1208 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1209 sizeof(struct ust_register_msg));
1210 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1211 if (ret < 0) {
1212 perror("lttcomm_recv_unix_sock register apps");
1213 } else {
1214 ERR("Wrong size received on apps register");
1215 }
1216 free(ust_cmd);
1217 close(sock);
1218 continue;
1219 }
099e26bd 1220
5eb91c98 1221 ust_cmd->sock = sock;
099e26bd 1222
5eb91c98
DG		 1223 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1224 " gid:%d sock:%d name:%s (version %d.%d)",
1225 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1226 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1227 ust_cmd->sock, ust_cmd->reg_msg.name,
1228 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1229
5eb91c98
DG		 1230 /*
1231 * Lock free enqueue the registration request. The red pill
54d01ffb 1232 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1233 */
1234 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1235
1236 /*
1237 * Wake the registration queue futex. Implicit memory
1238 * barrier with the exchange in cds_wfq_enqueue.
1239 */
1240 futex_nto1_wake(&ust_cmd_queue.futex);
1241 }
1242 }
90014c57 1243 }
1d4b027a
DG		 1244 }
1245
1246error:
0fdd1e2c
DG		 1247 DBG("UST Registration thread dying");
1248
1249 /* Notify that the registration thread is gone */
1250 notify_ust_apps(0);
1251
1252 close(apps_sock);
1253 close(sock);
273ea72c 1254 unlink(apps_unix_sock_path);
0fdd1e2c 1255
5eb91c98
DG		 1256 lttng_poll_clean(&events);
1257
1d4b027a
DG		 1258 return NULL;
1259}
1260
8c0faa1d 1261/*
d063d709
DG		 1262 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
1263 * exec or it will fails.
8c0faa1d 1264 */
693bd40b 1265static int spawn_kconsumerd_thread(void)
8c0faa1d
DG		 1266{
1267 int ret;
ee0b0061
DG		 1268 struct timespec timeout;
1269
1270 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1271 timeout.tv_nsec = 0;
8c0faa1d
DG		 1272
1273 /* Setup semaphore */
ee0b0061
DG		 1274 ret = sem_init(&kconsumerd_sem, 0, 0);
1275 if (ret < 0) {
1276 PERROR("sem_init kconsumerd_sem");
1277 goto error;
1278 }
8c0faa1d 1279
54d01ffb
DG		 1280 ret = pthread_create(&kconsumerd_thread, NULL,
1281 thread_manage_kconsumerd, (void *) NULL);
8c0faa1d 1282 if (ret != 0) {
ee0b0061
DG		 1283 PERROR("pthread_create kconsumerd");
1284 ret = -1;
8c0faa1d
DG		 1285 goto error;
1286 }
1287
ee0b0061
DG		 1288 /* Get time for sem_timedwait absolute timeout */
1289 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1290 if (ret < 0) {
1291 PERROR("clock_gettime spawn kconsumerd");
1292 /* Infinite wait for the kconsumerd thread to be ready */
1293 ret = sem_wait(&kconsumerd_sem);
1294 } else {
1295 /* Normal timeout if the gettime was successful */
1296 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1297 ret = sem_timedwait(&kconsumerd_sem, &timeout);
1298 }
8c0faa1d 1299
ee0b0061
DG		 1300 if (ret < 0) {
1301 if (errno == ETIMEDOUT) {
1302 /*
1303 * Call has timed out so we kill the kconsumerd_thread and return
1304 * an error.
1305 */
1306 ERR("The kconsumerd thread was never ready. Killing it");
1307 ret = pthread_cancel(kconsumerd_thread);
1308 if (ret < 0) {
1309 PERROR("pthread_cancel kconsumerd_thread");
1310 }
1311 } else {
1312 PERROR("semaphore wait failed kconsumerd thread");
1313 }
1314 goto error;
1315 }
1316
1317 pthread_mutex_lock(&kconsumerd_pid_mutex);
712ea556
DG		 1318 if (kconsumerd_pid == 0) {
1319 ERR("Kconsumerd did not start");
ee0b0061 1320 pthread_mutex_unlock(&kconsumerd_pid_mutex);
712ea556
DG		 1321 goto error;
1322 }
ee0b0061 1323 pthread_mutex_unlock(&kconsumerd_pid_mutex);
712ea556 1324
8c0faa1d
DG		 1325 return 0;
1326
1327error:
1328 return ret;
1329}
1330
d9800920
DG		 1331/*
1332 * Join kernel consumer thread
1333 */
cf3af59e
MD		 1334static int join_kconsumerd_thread(void)
1335{
1336 void *status;
1337 int ret;
1338
1339 if (kconsumerd_pid != 0) {
1340 ret = kill(kconsumerd_pid, SIGTERM);
1341 if (ret) {
1342 ERR("Error killing kconsumerd");
1343 return ret;
1344 }
1345 return pthread_join(kconsumerd_thread, &status);
1346 } else {
1347 return 0;
1348 }
1349}
1350
8c0faa1d 1351/*
d063d709 1352 * Fork and exec a kernel consumer daemon (kconsumerd).
8c0faa1d 1353 *
d063d709 1354 * Return pid if successful else -1.
8c0faa1d 1355 */
693bd40b 1356static pid_t spawn_kconsumerd(void)
8c0faa1d
DG		 1357{
1358 int ret;
1359 pid_t pid;
53086306 1360 const char *verbosity;
8c0faa1d 1361
c49dc785
DG		 1362 DBG("Spawning kconsumerd");
1363
8c0faa1d
DG		 1364 pid = fork();
1365 if (pid == 0) {
1366 /*
1367 * Exec kconsumerd.
1368 */
31f73cc9 1369 if (opt_verbose > 1 || opt_verbose_kconsumerd) {
53086306
DG		 1370 verbosity = "--verbose";
1371 } else {
1372 verbosity = "--quiet";
1373 }
54d01ffb
DG		 1374 execl(INSTALL_BIN_PATH "/ltt-kconsumerd",
1375 "ltt-kconsumerd", verbosity, NULL);
8c0faa1d
DG		 1376 if (errno != 0) {
1377 perror("kernel start consumer exec");
1378 }
1379 exit(EXIT_FAILURE);
1380 } else if (pid > 0) {
1381 ret = pid;
1382 goto error;
1383 } else {
1384 perror("kernel start consumer fork");
1385 ret = -errno;
1386 goto error;
1387 }
1388
1389error:
1390 return ret;
1391}
1392
693bd40b 1393/*
d063d709 1394 * Spawn the kconsumerd daemon and session daemon thread.
693bd40b
DG		 1395 */
1396static int start_kconsumerd(void)
1397{
1398 int ret;
1399
693bd40b 1400 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785 1401 if (kconsumerd_pid != 0) {
817153bb 1402 pthread_mutex_unlock(&kconsumerd_pid_mutex);
c49dc785
DG		 1403 goto end;
1404 }
693bd40b 1405
c49dc785
DG		 1406 ret = spawn_kconsumerd();
1407 if (ret < 0) {
1408 ERR("Spawning kconsumerd failed");
c49dc785
DG		 1409 pthread_mutex_unlock(&kconsumerd_pid_mutex);
1410 goto error;
693bd40b 1411 }
c49dc785
DG		 1412
1413 /* Setting up the global kconsumerd_pid */
1414 kconsumerd_pid = ret;
ee0b0061 1415 DBG2("Kconsumerd pid %d", kconsumerd_pid);
693bd40b
DG		 1416 pthread_mutex_unlock(&kconsumerd_pid_mutex);
1417
ee0b0061 1418 DBG2("Spawning kconsumerd thread");
693bd40b
DG		 1419 ret = spawn_kconsumerd_thread();
1420 if (ret < 0) {
1421 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG		 1422 goto error;
1423 }
1424
c49dc785 1425end:
693bd40b
DG		 1426 return 0;
1427
1428error:
1429 return ret;
1430}
1431
b73401da 1432/*
d063d709 1433 * modprobe_kernel_modules
b73401da
DG		 1434 */
1435static int modprobe_kernel_modules(void)
1436{
ab147185 1437 int ret = 0, i;
b73401da
DG		 1438 char modprobe[256];
1439
ab147185
MD		 1440 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1441 ret = snprintf(modprobe, sizeof(modprobe),
1442 "/sbin/modprobe %s%s",
1443 kernel_modules_list[i].required ? "" : "--quiet ",
1444 kernel_modules_list[i].name);
b73401da
DG		 1445 if (ret < 0) {
1446 perror("snprintf modprobe");
1447 goto error;
1448 }
ab147185 1449 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1450 ret = system(modprobe);
ab147185
MD		 1451 if (ret == -1) {
1452 ERR("Unable to launch modprobe for module %s",
1453 kernel_modules_list[i].name);
1454 } else if (kernel_modules_list[i].required
d9800920 1455 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1456 ERR("Unable to load module %s",
1457 kernel_modules_list[i].name);
1458 } else {
1459 DBG("Modprobe successfully %s",
1460 kernel_modules_list[i].name);
1461 }
1462 }
1463
1464error:
1465 return ret;
1466}
1467
b73401da 1468/*
d063d709 1469 * mount_debugfs
b73401da
DG		 1470 */
1471static int mount_debugfs(char *path)
1472{
1473 int ret;
1474 char *type = "debugfs";
1475
996b65c8 1476 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1477 if (ret < 0) {
7272acf5 1478 PERROR("Cannot create debugfs path");
b73401da
DG		 1479 goto error;
1480 }
1481
1482 ret = mount(type, path, type, 0, NULL);
1483 if (ret < 0) {
7272acf5 1484 PERROR("Cannot mount debugfs");
b73401da
DG		 1485 goto error;
1486 }
1487
1488 DBG("Mounted debugfs successfully at %s", path);
1489
1490error:
1491 return ret;
1492}
1493
8c0faa1d 1494/*
d063d709 1495 * Setup necessary data for kernel tracer action.
8c0faa1d 1496 */
f3ed775e 1497static void init_kernel_tracer(void)
8c0faa1d 1498{
b73401da
DG		 1499 int ret;
1500 char *proc_mounts = "/proc/mounts";
1501 char line[256];
684d34d2 1502 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1503 FILE *fp;
1504
1505 /* Detect debugfs */
1506 fp = fopen(proc_mounts, "r");
1507 if (fp == NULL) {
1508 ERR("Unable to probe %s", proc_mounts);
1509 goto error;
1510 }
1511
1512 while (fgets(line, sizeof(line), fp) != NULL) {
1513 if (strstr(line, "debugfs") != NULL) {
1514 /* Remove first string */
1515 strtok(line, " ");
1516 /* Dup string here so we can reuse line later on */
1517 debugfs_path = strdup(strtok(NULL, " "));
1518 DBG("Got debugfs path : %s", debugfs_path);
1519 break;
1520 }
1521 }
1522
1523 fclose(fp);
1524
1525 /* Mount debugfs if needded */
1526 if (debugfs_path == NULL) {
1527 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1528 if (ret < 0) {
1529 perror("asprintf debugfs path");
1530 goto error;
1531 }
1532 ret = mount_debugfs(debugfs_path);
1533 if (ret < 0) {
7272acf5 1534 perror("Cannot mount debugfs");
b73401da
DG		 1535 goto error;
1536 }
1537 }
1538
1539 /* Modprobe lttng kernel modules */
1540 ret = modprobe_kernel_modules();
1541 if (ret < 0) {
1542 goto error;
1543 }
1544
1545 /* Setup lttng kernel path */
1546 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1547 if (ret < 0) {
1548 perror("asprintf lttng path");
1549 goto error;
1550 }
1551
1552 /* Open debugfs lttng */
1553 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1554 if (kernel_tracer_fd < 0) {
b73401da
DG		 1555 DBG("Failed to open %s", lttng_path);
1556 goto error;
8c0faa1d
DG		 1557 }
1558
b73401da
DG		 1559 free(lttng_path);
1560 free(debugfs_path);
f3ed775e 1561 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1562 return;
1563
1564error:
1565 if (lttng_path) {
1566 free(lttng_path);
1567 }
1568 if (debugfs_path) {
1569 free(debugfs_path);
1570 }
1571 WARN("No kernel tracer available");
1572 kernel_tracer_fd = 0;
1573 return;
f3ed775e 1574}
33a2b854 1575
f3ed775e 1576/*
54d01ffb 1577 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1578 */
54d01ffb 1579static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1580{
f40799e8 1581 int ret = 0;
8c0faa1d 1582
f3ed775e 1583 if (session->kconsumer_fds_sent == 0) {
d9800920 1584 /*
54d01ffb
DG		 1585 * Assign default kernel consumer socket if no consumer assigned to the
1586 * kernel session. At this point, it's NOT suppose to be 0 but this is
1587 * an extra security check.
d9800920
DG		 1588 */
1589 if (session->consumer_fd == 0) {
1590 session->consumer_fd = kconsumerd_cmd_sock;
1591 }
1592
1593 ret = send_kconsumerd_fds(session);
f3ed775e 1594 if (ret < 0) {
f3ed775e
DG		 1595 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1596 goto error;
1597 }
1d4b027a 1598
f3ed775e
DG		 1599 session->kconsumer_fds_sent = 1;
1600 }
1d4b027a
DG		 1601
1602error:
1603 return ret;
8c0faa1d
DG		 1604}
1605
0177d773
DG		 1606/*
1607 * Create an UST session and add it to the session ust list.
1608 */
44d3bd01
DG		 1609static int create_ust_session(struct ltt_session *session,
1610 struct lttng_domain *domain)
0177d773 1611{
44d3bd01 1612 int ret;
13384287 1613 struct ltt_ust_session *lus = NULL;
56fff090 1614 struct ust_app *app;
44d3bd01
DG		 1615
1616 switch (domain->type) {
1617 case LTTNG_DOMAIN_UST_PID:
56fff090 1618 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG		 1619 if (app == NULL) {
1620 ret = LTTCOMM_APP_NOT_FOUND;
1621 goto error;
1622 }
1623 break;
1624 default:
13384287 1625 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1626 goto error;
1627 }
0177d773
DG		 1628
1629 DBG("Creating UST session");
1630
44d3bd01 1631 lus = trace_ust_create_session(session->path, domain->attr.pid, domain);
0177d773 1632 if (lus == NULL) {
44d3bd01 1633 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1634 goto error;
1635 }
1636
1637 ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG,
1638 geteuid(), allowed_group());
1639 if (ret < 0) {
1640 if (ret != -EEXIST) {
1641 ERR("Trace directory creation error");
44d3bd01 1642 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1643 goto error;
1644 }
1645 }
1646
1647 /* Create session on the UST tracer */
44d3bd01 1648 ret = ustctl_create_session(app->sock, lus);
0177d773 1649 if (ret < 0) {
44d3bd01 1650 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1651 goto error;
1652 }
1653
44d3bd01
DG		 1654 cds_list_add(&lus->list, &session->ust_session_list.head);
1655 session->ust_session_list.count++;
1656
1657 return LTTCOMM_OK;
0177d773
DG		 1658
1659error:
1660 free(lus);
1661 return ret;
1662}
1663
333f285e 1664/*
d063d709 1665 * Create a kernel tracer session then create the default channel.
333f285e 1666 */
f3ed775e 1667static int create_kernel_session(struct ltt_session *session)
333f285e 1668{
f3ed775e 1669 int ret;
f3ed775e
DG		 1670
1671 DBG("Creating kernel session");
1672
1673 ret = kernel_create_session(session, kernel_tracer_fd);
1674 if (ret < 0) {
1675 ret = LTTCOMM_KERN_SESS_FAIL;
1676 goto error;
333f285e
DG		 1677 }
1678
d9800920
DG		 1679 /* Set kernel consumer socket fd */
1680 if (kconsumerd_cmd_sock) {
1681 session->kernel_session->consumer_fd = kconsumerd_cmd_sock;
1682 }
1683
63053e7c
DG		 1684 ret = mkdir_recursive(session->kernel_session->trace_path,
1685 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1686 if (ret < 0) {
996b65c8 1687 if (ret != -EEXIST) {
7a485870
DG		 1688 ERR("Trace directory creation error");
1689 goto error;
1690 }
1691 }
1692
f3ed775e
DG		 1693error:
1694 return ret;
333f285e
DG		 1695}
1696
6c9cc2ab
DG		 1697/*
1698 * Using the session list, filled a lttng_session array to send back to the
1699 * client for session listing.
1700 *
1701 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1702 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG		 1703 */
1704static void list_lttng_sessions(struct lttng_session *sessions)
1705{
1706 int i = 0;
1707 struct ltt_session *session;
1708
1709 DBG("Getting all available session");
1710 /*
1711 * Iterate over session list and append data after the control struct in
1712 * the buffer.
1713 */
1714 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1715 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1716 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1717 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1718 sessions[i].name[NAME_MAX - 1] = '\0';
6c9cc2ab
DG		 1719 i++;
1720 }
1721}
1722
9f19cc17
DG		 1723/*
1724 * Fill lttng_channel array of all channels.
1725 */
1726static void list_lttng_channels(struct ltt_session *session,
1727 struct lttng_channel *channels)
1728{
1729 int i = 0;
1730 struct ltt_kernel_channel *kchan;
1731
1732 DBG("Listing channels for session %s", session->name);
1733
1734 /* Kernel channels */
1735 if (session->kernel_session != NULL) {
54d01ffb
DG		 1736 cds_list_for_each_entry(kchan,
1737 &session->kernel_session->channel_list.head, list) {
9f19cc17
DG		 1738 /* Copy lttng_channel struct to array */
1739 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1740 channels[i].enabled = kchan->enabled;
1741 i++;
1742 }
1743 }
1744
1745 /* TODO: Missing UST listing */
1746}
1747
1748/*
1749 * Fill lttng_event array of all events in the channel.
1750 */
1751static void list_lttng_events(struct ltt_kernel_channel *kchan,
1752 struct lttng_event *events)
1753{
1754 /*
1755 * TODO: This is ONLY kernel. Need UST support.
1756 */
1757 int i = 0;
1758 struct ltt_kernel_event *event;
1759
1760 DBG("Listing events for channel %s", kchan->channel->name);
1761
1762 /* Kernel channels */
1763 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
1764 strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
99497cd0 1765 events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
9f19cc17
DG		 1766 events[i].enabled = event->enabled;
1767 switch (event->event->instrumentation) {
1768 case LTTNG_KERNEL_TRACEPOINT:
1769 events[i].type = LTTNG_EVENT_TRACEPOINT;
1770 break;
1771 case LTTNG_KERNEL_KPROBE:
1772 case LTTNG_KERNEL_KRETPROBE:
1773 events[i].type = LTTNG_EVENT_PROBE;
1774 memcpy(&events[i].attr.probe, &event->event->u.kprobe,
1775 sizeof(struct lttng_kernel_kprobe));
1776 break;
1777 case LTTNG_KERNEL_FUNCTION:
1778 events[i].type = LTTNG_EVENT_FUNCTION;
1779 memcpy(&events[i].attr.ftrace, &event->event->u.ftrace,
1780 sizeof(struct lttng_kernel_function));
1781 break;
0133c199
MD		 1782 case LTTNG_KERNEL_NOOP:
1783 events[i].type = LTTNG_EVENT_NOOP;
1784 break;
a54bd42d
MD		 1785 case LTTNG_KERNEL_SYSCALL:
1786 events[i].type = LTTNG_EVENT_SYSCALL;
0133c199 1787 break;
7a3d1328
MD		 1788 case LTTNG_KERNEL_ALL:
1789 assert(0);
1790 break;
9f19cc17
DG		 1791 }
1792 i++;
1793 }
1794}
1795
fac6795d 1796/*
54d01ffb 1797 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 1798 */
54d01ffb
DG		 1799static int cmd_disable_channel(struct ltt_session *session,
1800 int domain, char *channel_name)
fac6795d 1801{
54d01ffb 1802 int ret;
379473d2 1803
54d01ffb
DG		 1804 switch (domain) {
1805 case LTTNG_DOMAIN_KERNEL:
1806 ret = channel_kernel_disable(session->kernel_session,
1807 channel_name);
1808 if (ret != LTTCOMM_OK) {
333f285e
DG		 1809 goto error;
1810 }
54d01ffb
DG		 1811
1812 kernel_wait_quiescent(kernel_tracer_fd);
d0254c7c 1813 break;
44d3bd01
DG		 1814 case LTTNG_DOMAIN_UST_PID:
1815 break;
d0254c7c 1816 default:
44d3bd01 1817 ret = LTTCOMM_UNKNOWN_DOMAIN;
54d01ffb 1818 goto error;
20fe2104
DG		 1819 }
1820
54d01ffb 1821 ret = LTTCOMM_OK;
d65106b1 1822
54d01ffb
DG		 1823error:
1824 return ret;
1825}
1826
56fff090
DG		 1827/*
1828 * Copy channel from attributes and set it in the application channel list.
1829 */
1830static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
1831 struct lttng_channel *attr, struct ust_app *app)
1832{
1833 int ret;
1834 struct ltt_ust_channel *uchan, *new_chan;
1835
1836 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1837 if (uchan == NULL) {
1838 ret = LTTCOMM_FATAL;
1839 goto error;
1840 }
1841
1842 new_chan = trace_ust_create_channel(attr, usess->path);
1843 if (new_chan == NULL) {
1844 PERROR("malloc ltt_ust_channel");
1845 ret = LTTCOMM_FATAL;
1846 goto error;
1847 }
1848
1849 ret = channel_ust_copy(new_chan, uchan);
1850 if (ret < 0) {
1851 ret = LTTCOMM_FATAL;
1852 goto error;
1853 }
1854
1855 /* Add channel to the ust app channel list */
1856 cds_list_add(&new_chan->list, &app->channels.head);
1857 app->channels.count++;
1858
1859error:
1860 return ret;
1861}
1862
54d01ffb
DG		 1863/*
1864 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1865 */
44d3bd01
DG		 1866static int cmd_enable_channel(struct ltt_session *session,
1867 struct lttng_domain *domain, struct lttng_channel *attr)
54d01ffb
DG		 1868{
1869 int ret;
d65106b1 1870
44d3bd01
DG		 1871 switch (domain->type) {
1872 case LTTNG_DOMAIN_KERNEL:
1873 {
1874 struct ltt_kernel_channel *kchan;
54d01ffb 1875
44d3bd01
DG		 1876 kchan = trace_kernel_get_channel_by_name(attr->name,
1877 session->kernel_session);
1878 if (kchan == NULL) {
1879 ret = channel_kernel_create(session->kernel_session,
1880 attr, kernel_poll_pipe[1]);
1881 } else {
1882 ret = channel_kernel_enable(session->kernel_session, kchan);
1883 }
1884
1885 if (ret != LTTCOMM_OK) {
1886 goto error;
1887 }
1888
1889 kernel_wait_quiescent(kernel_tracer_fd);
1890 break;
1891 }
1892 case LTTNG_DOMAIN_UST_PID:
1893 {
56fff090
DG		 1894 int sock;
1895 struct ltt_ust_channel *uchan;
44d3bd01 1896 struct ltt_ust_session *usess;
56fff090 1897 struct ust_app *app;
44d3bd01
DG		 1898
1899 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
1900 domain->attr.pid);
1901 if (usess == NULL) {
1902 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
1903 goto error;
1904 }
1905
56fff090 1906 app = ust_app_get_by_pid(domain->attr.pid);
44d3bd01
DG		 1907 if (app == NULL) {
1908 ret = LTTCOMM_APP_NOT_FOUND;
1909 goto error;
1910 }
56fff090 1911 sock = app->sock;
44d3bd01
DG		 1912
1913 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1914 if (uchan == NULL) {
56fff090 1915 ret = channel_ust_create(usess, attr, sock);
44d3bd01 1916 } else {
56fff090 1917 ret = channel_ust_enable(usess, uchan, sock);
44d3bd01
DG		 1918 }
1919
1920 if (ret != LTTCOMM_OK) {
1921 goto error;
1922 }
1923
56fff090
DG		 1924 ret = copy_ust_channel_to_app(usess, attr, app);
1925 if (ret != LTTCOMM_OK) {
44d3bd01
DG		 1926 goto error;
1927 }
1928
44d3bd01
DG		 1929 DBG("UST channel %s created for app sock %d with pid %d",
1930 attr->name, app->sock, domain->attr.pid);
1931 break;
1932 }
1933 default:
1934 ret = LTTCOMM_UNKNOWN_DOMAIN;
1935 goto error;
54d01ffb
DG		 1936 }
1937
1938 ret = LTTCOMM_OK;
1939
1940error:
1941 return ret;
1942}
1943
1944/*
1945 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1946 */
1947static int cmd_disable_event(struct ltt_session *session, int domain,
1948 char *channel_name, char *event_name)
1949{
1950 int ret;
1951 struct ltt_kernel_channel *kchan;
1952
1953 switch (domain) {
1954 case LTTNG_DOMAIN_KERNEL:
1955 kchan = trace_kernel_get_channel_by_name(channel_name,
1956 session->kernel_session);
1957 if (kchan == NULL) {
1958 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1959 goto error;
d65106b1
DG		 1960 }
1961
7a3d1328 1962 ret = event_kernel_disable_tracepoint(session->kernel_session, kchan, event_name);
54d01ffb
DG		 1963 if (ret != LTTCOMM_OK) {
1964 goto error;
1965 }
1966
1967 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 1968 break;
54d01ffb
DG		 1969 default:
1970 /* TODO: Userspace tracing */
1971 ret = LTTCOMM_NOT_IMPLEMENTED;
1972 goto error;
d65106b1 1973 }
26cc6b4e 1974
54d01ffb
DG		 1975 ret = LTTCOMM_OK;
1976
1977error:
1978 return ret;
1979}
1980
1981/*
1982 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1983 */
1984static int cmd_disable_event_all(struct ltt_session *session, int domain,
1985 char *channel_name)
1986{
1987 int ret;
1988 struct ltt_kernel_channel *kchan;
1989
1990 switch (domain) {
1991 case LTTNG_DOMAIN_KERNEL:
1992 kchan = trace_kernel_get_channel_by_name(channel_name,
1993 session->kernel_session);
1994 if (kchan == NULL) {
1995 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
1996 goto error;
26cc6b4e
DG		 1997 }
1998
54d01ffb
DG		 1999 ret = event_kernel_disable_all(session->kernel_session, kchan);
2000 if (ret != LTTCOMM_OK) {
0b97ec54 2001 goto error;
26cc6b4e
DG		 2002 }
2003
54d01ffb 2004 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2005 break;
54d01ffb
DG		 2006 default:
2007 /* TODO: Userspace tracing */
2008 ret = LTTCOMM_NOT_IMPLEMENTED;
2009 goto error;
26cc6b4e 2010 }
e953ef25 2011
54d01ffb 2012 ret = LTTCOMM_OK;
e953ef25 2013
54d01ffb
DG		 2014error:
2015 return ret;
2016}
f5177a38 2017
54d01ffb
DG		 2018/*
2019 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2020 */
2021static int cmd_add_context(struct ltt_session *session, int domain,
2022 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2023{
2024 int ret;
f5177a38 2025
54d01ffb
DG		 2026 switch (domain) {
2027 case LTTNG_DOMAIN_KERNEL:
2028 /* Add kernel context to kernel tracer */
2029 ret = context_kernel_add(session->kernel_session, ctx,
2030 event_name, channel_name);
2031 if (ret != LTTCOMM_OK) {
f5177a38 2032 goto error;
e953ef25
DG		 2033 }
2034
e953ef25 2035 break;
54d01ffb
DG		 2036 default:
2037 /* TODO: Userspace tracing */
2038 ret = LTTCOMM_NOT_IMPLEMENTED;
2039 goto error;
e953ef25 2040 }
950131af 2041
54d01ffb 2042 ret = LTTCOMM_OK;
950131af 2043
54d01ffb
DG		 2044error:
2045 return ret;
2046}
2047
2048/*
2049 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2050 */
2051static int cmd_enable_event(struct ltt_session *session, int domain,
2052 char *channel_name, struct lttng_event *event)
2053{
2054 int ret;
2055 struct ltt_kernel_channel *kchan;
2056
2057 switch (domain) {
2058 case LTTNG_DOMAIN_KERNEL:
2059 kchan = trace_kernel_get_channel_by_name(channel_name,
2060 session->kernel_session);
2061 if (kchan == NULL) {
2062 /* This call will notify the kernel thread */
44d3bd01 2063 ret = channel_kernel_create(session->kernel_session,
54d01ffb
DG		 2064 NULL, kernel_poll_pipe[1]);
2065 if (ret != LTTCOMM_OK) {
f5177a38
DG		 2066 goto error;
2067 }
54d01ffb 2068 }
950131af 2069
54d01ffb
DG		 2070 /* Get the newly created kernel channel pointer */
2071 kchan = trace_kernel_get_channel_by_name(channel_name,
2072 session->kernel_session);
2073 if (kchan == NULL) {
2074 /* This sould not happen... */
2075 ret = LTTCOMM_FATAL;
2076 goto error;
2077 }
f5177a38 2078
7a3d1328 2079 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, event);
54d01ffb 2080 if (ret != LTTCOMM_OK) {
f5177a38 2081 goto error;
950131af
DG		 2082 }
2083
54d01ffb 2084 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2085 break;
54d01ffb
DG		 2086 default:
2087 /* TODO: Userspace tracing */
2088 ret = LTTCOMM_NOT_IMPLEMENTED;
2089 goto error;
950131af 2090 }
d36b8583 2091
54d01ffb 2092 ret = LTTCOMM_OK;
d36b8583 2093
54d01ffb
DG		 2094error:
2095 return ret;
2096}
7d29a247 2097
54d01ffb
DG		 2098/*
2099 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2100 */
2101static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2102 char *channel_name, int event_type)
54d01ffb
DG		 2103{
2104 int ret;
2105 struct ltt_kernel_channel *kchan;
7d29a247 2106
54d01ffb
DG		 2107 switch (domain) {
2108 case LTTNG_DOMAIN_KERNEL:
2109 kchan = trace_kernel_get_channel_by_name(channel_name,
2110 session->kernel_session);
2111 if (kchan == NULL) {
2112 /* This call will notify the kernel thread */
44d3bd01
DG		 2113 ret = channel_kernel_create(session->kernel_session, NULL,
2114 kernel_poll_pipe[1]);
54d01ffb
DG		 2115 if (ret != LTTCOMM_OK) {
2116 goto error;
d36b8583 2117 }
54d01ffb 2118 }
0d0c377a 2119
54d01ffb
DG		 2120 /* Get the newly created kernel channel pointer */
2121 kchan = trace_kernel_get_channel_by_name(channel_name,
2122 session->kernel_session);
2123 if (kchan == NULL) {
2124 /* This sould not happen... */
2125 ret = LTTCOMM_FATAL;
2126 goto error;
2127 }
0fdd1e2c 2128
7a3d1328
MD		 2129 switch (event_type) {
2130 case LTTNG_KERNEL_SYSCALL:
2131 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2132 kchan, kernel_tracer_fd);
7a3d1328
MD		 2133 break;
2134 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2135 /*
7a3d1328
MD		 2136 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2137 * events already registered to the channel.
8c9ae521 2138 */
7a3d1328
MD		 2139 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2140 kchan, kernel_tracer_fd);
2141 break;
2142 case LTTNG_KERNEL_ALL:
2143 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2144 ret = event_kernel_enable_all(session->kernel_session,
2145 kchan, kernel_tracer_fd);
7a3d1328
MD		 2146 break;
2147 default:
2148 ret = LTTCOMM_KERN_ENABLE_FAIL;
2149 goto error;
8c9ae521 2150 }
54d01ffb 2151 if (ret != LTTCOMM_OK) {
0d0c377a 2152 goto error;
d36b8583
DG		 2153 }
2154
54d01ffb 2155 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2156 break;
54d01ffb
DG		 2157 default:
2158 /* TODO: Userspace tracing */
2159 ret = LTTCOMM_NOT_IMPLEMENTED;
2160 goto error;
d36b8583 2161 }
f3ed775e 2162
54d01ffb
DG		 2163 ret = LTTCOMM_OK;
2164
2165error:
2166 return ret;
2167}
2168
2169/*
2170 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2171 */
2172static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2173{
2174 int ret;
2175 ssize_t nb_events = 0;
2176
2177 switch (domain) {
2178 case LTTNG_DOMAIN_KERNEL:
2179 nb_events = kernel_list_events(kernel_tracer_fd, events);
2180 if (nb_events < 0) {
2181 ret = LTTCOMM_KERN_LIST_FAIL;
2182 goto error;
894be886 2183 }
54d01ffb
DG		 2184 break;
2185 default:
2186 /* TODO: Userspace listing */
2187 ret = LTTCOMM_NOT_IMPLEMENTED;
2188 goto error;
2189 }
894be886 2190
54d01ffb 2191 return nb_events;
7d29a247 2192
54d01ffb
DG		 2193error:
2194 /* Return negative value to differentiate return code */
2195 return -ret;
2196}
b389abbe 2197
54d01ffb
DG		 2198/*
2199 * Command LTTNG_START_TRACE processed by the client thread.
2200 */
2201static int cmd_start_trace(struct ltt_session *session)
2202{
2203 int ret;
2204 struct ltt_kernel_channel *kchan;
2205 struct ltt_kernel_session *ksession;
b389abbe 2206
54d01ffb
DG		 2207 /* Short cut */
2208 ksession = session->kernel_session;
5eb91c98 2209
54d01ffb
DG		 2210 /* Kernel tracing */
2211 if (ksession != NULL) {
2212 /* Open kernel metadata */
2213 if (ksession->metadata == NULL) {
2214 ret = kernel_open_metadata(ksession, ksession->trace_path);
2215 if (ret < 0) {
2216 ret = LTTCOMM_KERN_META_FAIL;
2217 goto error;
b389abbe 2218 }
54d01ffb 2219 }
7d29a247 2220
54d01ffb
DG		 2221 /* Open kernel metadata stream */
2222 if (ksession->metadata_stream_fd == 0) {
2223 ret = kernel_open_metadata_stream(ksession);
2224 if (ret < 0) {
2225 ERR("Kernel create metadata stream failed");
2226 ret = LTTCOMM_KERN_STREAM_FAIL;
2227 goto error;
2228 }
2229 }
2230
2231 /* For each channel */
2232 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2233 if (kchan->stream_count == 0) {
2234 ret = kernel_open_channel_stream(kchan);
2235 if (ret < 0) {
2236 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2237 goto error;
2238 }
54d01ffb
DG		 2239 /* Update the stream global counter */
2240 ksession->stream_count_global += ret;
7d29a247 2241 }
54d01ffb
DG		 2242 }
2243
2244 /* Setup kernel consumer socket and send fds to it */
2245 ret = init_kernel_tracing(ksession);
2246 if (ret < 0) {
2247 ret = LTTCOMM_KERN_START_FAIL;
2248 goto error;
2249 }
2250
2251 /* This start the kernel tracing */
2252 ret = kernel_start_session(ksession);
2253 if (ret < 0) {
2254 ret = LTTCOMM_KERN_START_FAIL;
2255 goto error;
2256 }
2257
2258 /* Quiescent wait after starting trace */
2259 kernel_wait_quiescent(kernel_tracer_fd);
2260 }
2261
2262 /* TODO: Start all UST traces */
2263
2264 ret = LTTCOMM_OK;
2265
2266error:
2267 return ret;
2268}
2269
2270/*
2271 * Command LTTNG_STOP_TRACE processed by the client thread.
2272 */
2273static int cmd_stop_trace(struct ltt_session *session)
2274{
2275 int ret;
2276 struct ltt_kernel_channel *kchan;
2277 struct ltt_kernel_session *ksession;
2278
2279 /* Short cut */
2280 ksession = session->kernel_session;
2281
2282 /* Kernel tracer */
2283 if (ksession != NULL) {
2284 DBG("Stop kernel tracing");
2285
2286 /* Flush all buffers before stopping */
2287 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2288 if (ret < 0) {
2289 ERR("Kernel metadata flush failed");
2290 }
f34daff7 2291
54d01ffb
DG		 2292 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2293 ret = kernel_flush_buffer(kchan);
0d0c377a 2294 if (ret < 0) {
54d01ffb 2295 ERR("Kernel flush buffer error");
7d29a247 2296 }
54d01ffb 2297 }
19e70852 2298
54d01ffb
DG		 2299 ret = kernel_stop_session(ksession);
2300 if (ret < 0) {
2301 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2302 goto error;
f3ed775e 2303 }
54d01ffb
DG		 2304
2305 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2306 }
54d01ffb
DG		 2307
2308 /* TODO : User-space tracer */
2309
2310 ret = LTTCOMM_OK;
2311
2312error:
2313 return ret;
2314}
2315
2316/*
2317 * Command LTTNG_CREATE_SESSION processed by the client thread.
2318 */
2319static int cmd_create_session(char *name, char *path)
2320{
2321 int ret;
2322
2323 ret = session_create(name, path);
2324 if (ret != LTTCOMM_OK) {
2325 goto error;
2326 }
2327
2328 ret = LTTCOMM_OK;
2329
2330error:
2331 return ret;
2332}
2333
2334/*
2335 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2336 */
2337static int cmd_destroy_session(struct ltt_session *session, char *name)
2338{
2339 int ret;
2340
2341 /* Clean kernel session teardown */
2342 teardown_kernel_session(session);
2343
2344 /*
2345 * Must notify the kernel thread here to update it's poll setin order
2346 * to remove the channel(s)' fd just destroyed.
2347 */
2348 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2349 if (ret < 0) {
2350 perror("write kernel poll pipe");
2351 }
2352
271933a4 2353 ret = session_destroy(session);
54d01ffb
DG		 2354
2355 return ret;
2356}
2357
2358/*
2359 * Command LTTNG_CALIBRATE processed by the client thread.
2360 */
2361static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2362{
2363 int ret;
2364
2365 switch (domain) {
2366 case LTTNG_DOMAIN_KERNEL:
33a2b854 2367 {
54d01ffb 2368 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2369
54d01ffb
DG		 2370 kcalibrate.type = calibrate->type;
2371 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2372 if (ret < 0) {
54d01ffb
DG		 2373 ret = LTTCOMM_KERN_ENABLE_FAIL;
2374 goto error;
33a2b854 2375 }
54d01ffb
DG		 2376 break;
2377 }
2378 default:
2379 /* TODO: Userspace tracing */
2380 ret = LTTCOMM_NOT_IMPLEMENTED;
2381 goto error;
2382 }
33a2b854 2383
54d01ffb 2384 ret = LTTCOMM_OK;
33a2b854 2385
54d01ffb
DG		 2386error:
2387 return ret;
2388}
7d29a247 2389
54d01ffb
DG		 2390/*
2391 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2392 */
2393static int cmd_register_consumer(struct ltt_session *session, int domain,
2394 char *sock_path)
2395{
2396 int ret, sock;
b389abbe 2397
54d01ffb
DG		 2398 switch (domain) {
2399 case LTTNG_DOMAIN_KERNEL:
2400 /* Can't register a consumer if there is already one */
2401 if (session->kernel_session->consumer_fd != 0) {
2402 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2403 goto error;
2404 }
2405
2406 sock = lttcomm_connect_unix_sock(sock_path);
2407 if (sock < 0) {
2408 ret = LTTCOMM_CONNECT_FAIL;
2409 goto error;
2410 }
2411
2412 session->kernel_session->consumer_fd = sock;
2413 break;
2414 default:
2415 /* TODO: Userspace tracing */
2416 ret = LTTCOMM_NOT_IMPLEMENTED;
2417 goto error;
2418 }
2419
2420 ret = LTTCOMM_OK;
2421
2422error:
2423 return ret;
2424}
2425
2426/*
2427 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2428 */
2429static ssize_t cmd_list_domains(struct ltt_session *session,
2430 struct lttng_domain **domains)
2431{
2432 int ret;
2433 ssize_t nb_dom = 0;
2434
2435 if (session->kernel_session != NULL) {
2436 nb_dom++;
2437 }
2438
2439 nb_dom += session->ust_session_list.count;
2440
2441 *domains = malloc(nb_dom * sizeof(struct lttng_domain));
2442 if (*domains == NULL) {
2443 ret = -LTTCOMM_FATAL;
2444 goto error;
2445 }
2446
2447 (*domains)[0].type = LTTNG_DOMAIN_KERNEL;
2448
2449 /* TODO: User-space tracer domain support */
2450
2451 return nb_dom;
2452
2453error:
2454 return ret;
2455}
2456
2457/*
2458 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2459 */
2460static ssize_t cmd_list_channels(struct ltt_session *session,
2461 struct lttng_channel **channels)
2462{
2463 int ret;
2464 ssize_t nb_chan = 0;
2465
2466 if (session->kernel_session != NULL) {
2467 nb_chan += session->kernel_session->channel_count;
2468 }
2469
2470 *channels = malloc(nb_chan * sizeof(struct lttng_channel));
2471 if (*channels == NULL) {
2472 ret = -LTTCOMM_FATAL;
2473 goto error;
2474 }
2475
2476 list_lttng_channels(session, *channels);
2477
2478 return nb_chan;
2479
2480error:
2481 return ret;
2482}
2483
2484/*
2485 * Command LTTNG_LIST_EVENTS processed by the client thread.
2486 */
2487static ssize_t cmd_list_events(struct ltt_session *session,
2488 char *channel_name, struct lttng_event **events)
2489{
2490 int ret;
2491 ssize_t nb_event = 0;
2492 struct ltt_kernel_channel *kchan = NULL;
2493
2494 if (session->kernel_session != NULL) {
2495 kchan = trace_kernel_get_channel_by_name(channel_name,
2496 session->kernel_session);
2497 if (kchan == NULL) {
2498 ret = -LTTCOMM_KERN_CHAN_NOT_FOUND;
2499 goto error;
2500 }
2501 nb_event += kchan->event_count;
2502 }
2503
2504 *events = malloc(nb_event * sizeof(struct lttng_event));
2505 if (*events == NULL) {
2506 ret = -LTTCOMM_FATAL;
2507 goto error;
2508 }
2509
2510 list_lttng_events(kchan, *events);
2511
2512 /* TODO: User-space tracer support */
2513
2514 return nb_event;
2515
2516error:
2517 return ret;
2518}
2519
2520/*
2521 * Process the command requested by the lttng client within the command
2522 * context structure. This function make sure that the return structure (llm)
2523 * is set and ready for transmission before returning.
2524 *
2525 * Return any error encountered or 0 for success.
2526 */
2527static int process_client_msg(struct command_ctx *cmd_ctx)
2528{
2529 int ret = LTTCOMM_OK;
44d3bd01 2530 int need_tracing_session = 1;
54d01ffb
DG		 2531
2532 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2533
2534 /*
2535 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2536 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 2537 * command.
2538 */
2539 switch(cmd_ctx->lsm->cmd_type) {
2540 case LTTNG_LIST_SESSIONS:
2541 case LTTNG_LIST_TRACEPOINTS:
2542 case LTTNG_LIST_DOMAINS:
2543 case LTTNG_LIST_CHANNELS:
2544 case LTTNG_LIST_EVENTS:
2545 break;
2546 default:
2547 /* Setup lttng message with no payload */
2548 ret = setup_lttng_msg(cmd_ctx, 0);
2549 if (ret < 0) {
2550 /* This label does not try to unlock the session */
2551 goto init_setup_error;
2552 }
2553 }
2554
2555 /* Commands that DO NOT need a session. */
2556 switch (cmd_ctx->lsm->cmd_type) {
2557 case LTTNG_CALIBRATE:
2558 case LTTNG_CREATE_SESSION:
2559 case LTTNG_LIST_SESSIONS:
2560 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 2561 need_tracing_session = 0;
54d01ffb
DG		 2562 break;
2563 default:
2564 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 2565 session_lock_list();
54d01ffb 2566 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 2567 session_unlock_list();
54d01ffb
DG		 2568 if (cmd_ctx->session == NULL) {
2569 if (cmd_ctx->lsm->session.name != NULL) {
2570 ret = LTTCOMM_SESS_NOT_FOUND;
2571 } else {
2572 /* If no session name specified */
2573 ret = LTTCOMM_SELECT_SESS;
2574 }
2575 goto error;
2576 } else {
2577 /* Acquire lock for the session */
2578 session_lock(cmd_ctx->session);
2579 }
2580 break;
2581 }
b389abbe 2582
54d01ffb
DG		 2583 /*
2584 * Check domain type for specific "pre-action".
2585 */
2586 switch (cmd_ctx->lsm->domain.type) {
2587 case LTTNG_DOMAIN_KERNEL:
2588 /* Kernel tracer check */
2589 if (kernel_tracer_fd == 0) {
2590 /* Basically, load kernel tracer modules */
2591 init_kernel_tracer();
2592 if (kernel_tracer_fd == 0) {
2593 ret = LTTCOMM_KERN_NA;
2594 goto error;
2595 }
2596 }
5eb91c98 2597
54d01ffb 2598 /* Need a session for kernel command */
44d3bd01 2599 if (need_tracing_session) {
54d01ffb
DG		 2600 if (cmd_ctx->session->kernel_session == NULL) {
2601 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2602 if (ret < 0) {
54d01ffb 2603 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 2604 goto error;
2605 }
b389abbe 2606 }
7d29a247 2607
54d01ffb 2608 /* Start the kernel consumer daemon */
4c93ba8b 2609 pthread_mutex_lock(&kconsumerd_pid_mutex);
54d01ffb
DG		 2610 if (kconsumerd_pid == 0 &&
2611 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
4c93ba8b 2612 pthread_mutex_unlock(&kconsumerd_pid_mutex);
54d01ffb 2613 ret = start_kconsumerd();
7d29a247 2614 if (ret < 0) {
54d01ffb
DG		 2615 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2616 goto error;
950131af 2617 }
33a2b854 2618 }
4c93ba8b 2619 pthread_mutex_unlock(&kconsumerd_pid_mutex);
0d0c377a 2620 }
54d01ffb 2621 break;
44d3bd01
DG		 2622 case LTTNG_DOMAIN_UST_PID:
2623 {
2624 struct ltt_ust_session *usess;
2625
2626 if (need_tracing_session) {
2627 usess = trace_ust_get_session_by_pid(
2628 &cmd_ctx->session->ust_session_list,
2629 cmd_ctx->lsm->domain.attr.pid);
2630 if (usess == NULL) {
2631 ret = create_ust_session(cmd_ctx->session,
2632 &cmd_ctx->lsm->domain);
2633 if (ret != LTTCOMM_OK) {
2634 goto error;
2635 }
2636 }
2637 }
2638 break;
2639 }
54d01ffb
DG		 2640 default:
2641 /* TODO Userspace tracer */
2642 break;
2643 }
33a2b854 2644
54d01ffb
DG		 2645 /* Process by command type */
2646 switch (cmd_ctx->lsm->cmd_type) {
2647 case LTTNG_ADD_CONTEXT:
2648 {
2649 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2650 cmd_ctx->lsm->u.context.channel_name,
2651 cmd_ctx->lsm->u.context.event_name,
2652 &cmd_ctx->lsm->u.context.ctx);
2653 break;
2654 }
2655 case LTTNG_DISABLE_CHANNEL:
2656 {
2657 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2658 cmd_ctx->lsm->u.disable.channel_name);
2659 break;
2660 }
2661 case LTTNG_DISABLE_EVENT:
2662 {
2663 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2664 cmd_ctx->lsm->u.disable.channel_name,
2665 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 2666 ret = LTTCOMM_OK;
2667 break;
2668 }
54d01ffb
DG		 2669 case LTTNG_DISABLE_ALL_EVENT:
2670 {
2671 DBG("Disabling all kernel event");
2672
2673 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2674 cmd_ctx->lsm->u.disable.channel_name);
2675 break;
2676 }
2677 case LTTNG_ENABLE_CHANNEL:
2678 {
44d3bd01 2679 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb
DG		 2680 &cmd_ctx->lsm->u.channel.chan);
2681 break;
2682 }
2683 case LTTNG_ENABLE_EVENT:
2684 {
2685 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2686 cmd_ctx->lsm->u.enable.channel_name,
2687 &cmd_ctx->lsm->u.enable.event);
2688 break;
2689 }
2690 case LTTNG_ENABLE_ALL_EVENT:
2691 {
2692 DBG("Enabling all kernel event");
2693
2694 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 2695 cmd_ctx->lsm->u.enable.channel_name,
2696 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 2697 break;
2698 }
052da939 2699 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2700 {
9f19cc17 2701 struct lttng_event *events;
54d01ffb 2702 ssize_t nb_events;
052da939 2703
54d01ffb
DG		 2704 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2705 if (nb_events < 0) {
2706 ret = -nb_events;
2707 goto error;
2ef84c95
DG		 2708 }
2709
2710 /*
2711 * Setup lttng message with payload size set to the event list size in
2712 * bytes and then copy list into the llm payload.
2713 */
052da939 2714 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2715 if (ret < 0) {
052da939 2716 free(events);
2ef84c95
DG		 2717 goto setup_error;
2718 }
2719
2720 /* Copy event list into message payload */
9f19cc17 2721 memcpy(cmd_ctx->llm->payload, events,
052da939 2722 sizeof(struct lttng_event) * nb_events);
2ef84c95 2723
9f19cc17 2724 free(events);
2ef84c95
DG		 2725
2726 ret = LTTCOMM_OK;
2727 break;
2728 }
f3ed775e 2729 case LTTNG_START_TRACE:
8c0faa1d 2730 {
54d01ffb 2731 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 2732 break;
2733 }
f3ed775e 2734 case LTTNG_STOP_TRACE:
8c0faa1d 2735 {
54d01ffb 2736 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 2737 break;
2738 }
5e16da05
MD		 2739 case LTTNG_CREATE_SESSION:
2740 {
54d01ffb
DG		 2741 ret = cmd_create_session(cmd_ctx->lsm->session.name,
2742 cmd_ctx->lsm->session.path);
5e16da05
MD		 2743 break;
2744 }
2745 case LTTNG_DESTROY_SESSION:
2746 {
54d01ffb
DG		 2747 ret = cmd_destroy_session(cmd_ctx->session,
2748 cmd_ctx->lsm->session.name);
5461b305 2749 break;
5e16da05 2750 }
9f19cc17 2751 case LTTNG_LIST_DOMAINS:
5e16da05 2752 {
54d01ffb
DG		 2753 ssize_t nb_dom;
2754 struct lttng_domain *domains;
5461b305 2755
54d01ffb
DG		 2756 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2757 if (nb_dom < 0) {
2758 ret = -nb_dom;
2759 goto error;
ce3d728c 2760 }
520ff687 2761
54d01ffb 2762 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 2763 if (ret < 0) {
2764 goto setup_error;
520ff687 2765 }
57167058 2766
54d01ffb
DG		 2767 /* Copy event list into message payload */
2768 memcpy(cmd_ctx->llm->payload, domains,
2769 nb_dom * sizeof(struct lttng_domain));
2770
2771 free(domains);
5e16da05 2772
5461b305 2773 ret = LTTCOMM_OK;
5e16da05
MD		 2774 break;
2775 }
9f19cc17 2776 case LTTNG_LIST_CHANNELS:
5e16da05 2777 {
54d01ffb
DG		 2778 size_t nb_chan;
2779 struct lttng_channel *channels;
2780
2781 nb_chan = cmd_list_channels(cmd_ctx->session, &channels);
2782 if (nb_chan < 0) {
2783 ret = -nb_chan;
2784 goto error;
5461b305 2785 }
ca95a216 2786
54d01ffb 2787 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 2788 if (ret < 0) {
2789 goto setup_error;
2790 }
9f19cc17 2791
54d01ffb
DG		 2792 /* Copy event list into message payload */
2793 memcpy(cmd_ctx->llm->payload, channels,
2794 nb_chan * sizeof(struct lttng_channel));
2795
2796 free(channels);
9f19cc17
DG		 2797
2798 ret = LTTCOMM_OK;
5461b305 2799 break;
5e16da05 2800 }
9f19cc17 2801 case LTTNG_LIST_EVENTS:
5e16da05 2802 {
54d01ffb 2803 size_t nb_event;
684d34d2 2804 struct lttng_event *events = NULL;
9f19cc17 2805
54d01ffb
DG		 2806 nb_event = cmd_list_events(cmd_ctx->session,
2807 cmd_ctx->lsm->u.list.channel_name, &events);
2808 if (nb_event < 0) {
2809 ret = -nb_event;
2810 goto error;
5461b305 2811 }
ca95a216 2812
54d01ffb 2813 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 2814 if (ret < 0) {
2815 goto setup_error;
2816 }
9f19cc17 2817
54d01ffb
DG		 2818 /* Copy event list into message payload */
2819 memcpy(cmd_ctx->llm->payload, events,
2820 nb_event * sizeof(struct lttng_event));
9f19cc17 2821
54d01ffb 2822 free(events);
9f19cc17
DG		 2823
2824 ret = LTTCOMM_OK;
5461b305 2825 break;
5e16da05
MD		 2826 }
2827 case LTTNG_LIST_SESSIONS:
2828 {
54d01ffb 2829 session_lock_list();
5461b305 2830
6c9cc2ab 2831 if (session_list_ptr->count == 0) {
f3ed775e 2832 ret = LTTCOMM_NO_SESSION;
54d01ffb 2833 session_unlock_list();
5461b305 2834 goto error;
57167058 2835 }
5e16da05 2836
6c9cc2ab
DG		 2837 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
2838 session_list_ptr->count);
5461b305 2839 if (ret < 0) {
54d01ffb 2840 session_unlock_list();
5461b305 2841 goto setup_error;
e065084a 2842 }
5e16da05 2843
6c9cc2ab
DG		 2844 /* Filled the session array */
2845 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
2846
54d01ffb 2847 session_unlock_list();
5e16da05 2848
5461b305 2849 ret = LTTCOMM_OK;
5e16da05
MD		 2850 break;
2851 }
d0254c7c
MD		 2852 case LTTNG_CALIBRATE:
2853 {
54d01ffb
DG		 2854 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
2855 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 2856 break;
2857 }
d9800920
DG		 2858 case LTTNG_REGISTER_CONSUMER:
2859 {
54d01ffb
DG		 2860 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2861 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 2862 break;
2863 }
5e16da05 2864 default:
5e16da05 2865 ret = LTTCOMM_UND;
5461b305 2866 break;
fac6795d
DG		 2867 }
2868
5461b305 2869error:
5461b305
DG		 2870 if (cmd_ctx->llm == NULL) {
2871 DBG("Missing llm structure. Allocating one.");
894be886 2872 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 2873 goto setup_error;
2874 }
2875 }
54d01ffb 2876 /* Set return code */
5461b305 2877 cmd_ctx->llm->ret_code = ret;
5461b305 2878setup_error:
b5541356 2879 if (cmd_ctx->session) {
54d01ffb 2880 session_unlock(cmd_ctx->session);
b5541356 2881 }
54d01ffb 2882init_setup_error:
8028d920 2883 return ret;
fac6795d
DG		 2884}
2885
1d4b027a 2886/*
d063d709
DG		 2887 * This thread manage all clients request using the unix client socket for
2888 * communication.
1d4b027a
DG		 2889 */
2890static void *thread_manage_clients(void *data)
2891{
5eb91c98
DG		 2892 int sock = 0, ret, i, pollfd;
2893 uint32_t revents, nb_fd;
273ea72c 2894 struct command_ctx *cmd_ctx = NULL;
5eb91c98 2895 struct lttng_poll_event events;
1d4b027a
DG		 2896
2897 DBG("[thread] Manage client started");
2898
2899 ret = lttcomm_listen_unix_sock(client_sock);
2900 if (ret < 0) {
2901 goto error;
2902 }
2903
5eb91c98
DG		 2904 /*
2905 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2906 * more will be added to this poll set.
2907 */
2908 ret = create_thread_poll_set(&events, 2);
2909 if (ret < 0) {
2910 goto error;
2911 }
273ea72c 2912
5eb91c98
DG		 2913 /* Add the application registration socket */
2914 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2915 if (ret < 0) {
2916 goto error;
2917 }
273ea72c 2918
bbd973c2
DG		 2919 /*
2920 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 2921 */
2922 if (opt_sig_parent) {
2923 kill(ppid, SIGCHLD);
2924 }
2925
2926 while (1) {
1d4b027a 2927 DBG("Accepting client command ...");
273ea72c 2928
5eb91c98
DG		 2929 nb_fd = LTTNG_POLL_GETNB(&events);
2930
273ea72c 2931 /* Inifinite blocking call, waiting for transmission */
5eb91c98 2932 ret = lttng_poll_wait(&events, -1);
273ea72c 2933 if (ret < 0) {
273ea72c
DG		 2934 goto error;
2935 }
2936
5eb91c98
DG		 2937 for (i = 0; i < nb_fd; i++) {
2938 /* Fetch once the poll data */
2939 revents = LTTNG_POLL_GETEV(&events, i);
2940 pollfd = LTTNG_POLL_GETFD(&events, i);
2941
2942 /* Thread quit pipe has been closed. Killing thread. */
2943 ret = check_thread_quit_pipe(pollfd, revents);
2944 if (ret) {
2945 goto error;
2946 }
2947
2948 /* Event on the registration socket */
2949 if (pollfd == client_sock) {
2950 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2951 ERR("Client socket poll error");
2952 goto error;
2953 }
2954 }
2955 }
2956
2957 DBG("Wait for client response");
2958
2959 sock = lttcomm_accept_unix_sock(client_sock);
2960 if (sock < 0) {
273ea72c 2961 goto error;
273ea72c
DG		 2962 }
2963
5eb91c98
DG		 2964 /* Allocate context command to process the client request */
2965 cmd_ctx = malloc(sizeof(struct command_ctx));
2966 if (cmd_ctx == NULL) {
2967 perror("malloc cmd_ctx");
1d4b027a 2968 goto error;
5eb91c98 2969 }
1d4b027a 2970
5eb91c98
DG		 2971 /* Allocate data buffer for reception */
2972 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
2973 if (cmd_ctx->lsm == NULL) {
2974 perror("malloc cmd_ctx->lsm");
2975 goto error;
2976 }
1d4b027a 2977
5eb91c98
DG		 2978 cmd_ctx->llm = NULL;
2979 cmd_ctx->session = NULL;
1d4b027a 2980
5eb91c98
DG		 2981 /*
2982 * Data is received from the lttng client. The struct
2983 * lttcomm_session_msg (lsm) contains the command and data request of
2984 * the client.
2985 */
2986 DBG("Receiving data from client ...");
2987 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
2988 sizeof(struct lttcomm_session_msg));
2989 if (ret <= 0) {
2990 DBG("Nothing recv() from client... continuing");
2991 close(sock);
2992 free(cmd_ctx);
2993 continue;
2994 }
1d4b027a 2995
5eb91c98
DG		 2996 // TODO: Validate cmd_ctx including sanity check for
2997 // security purpose.
f7776ea7 2998
5eb91c98
DG		 2999 /*
3000 * This function dispatch the work to the kernel or userspace tracer
3001 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3002 * informations for the client. The command context struct contains
3003 * everything this function may needs.
3004 */
3005 ret = process_client_msg(cmd_ctx);
3006 if (ret < 0) {
bbd973c2 3007 /*
5eb91c98
DG		 3008 * TODO: Inform client somehow of the fatal error. At
3009 * this point, ret < 0 means that a malloc failed
3010 * (ENOMEM). Error detected but still accept command.
bbd973c2 3011 */
bbd973c2 3012 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3013 continue;
3014 }
d6e4fca4 3015
54d01ffb
DG		 3016 DBG("Sending response (size: %d, retcode: %s)",
3017 cmd_ctx->lttng_msg_size,
532d79a7 3018 lttng_get_readable_code(-cmd_ctx->llm->ret_code));
54d01ffb 3019 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3020 if (ret < 0) {
3021 ERR("Failed to send data back to client");
bbd973c2 3022 }
1d4b027a 3023
5eb91c98
DG		 3024 clean_command_ctx(&cmd_ctx);
3025
3026 /* End of transmission */
273ea72c
DG		 3027 close(sock);
3028 }
3029
5eb91c98
DG		 3030error:
3031 DBG("Client thread dying");
273ea72c 3032 unlink(client_unix_sock_path);
5eb91c98
DG		 3033 close(client_sock);
3034 close(sock);
273ea72c 3035
5eb91c98 3036 lttng_poll_clean(&events);
a2fb29a5 3037 clean_command_ctx(&cmd_ctx);
1d4b027a
DG		 3038 return NULL;
3039}
3040
3041
fac6795d
DG		 3042/*
3043 * usage function on stderr
3044 */
3045static void usage(void)
3046{
b716ce68 3047 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3048 fprintf(stderr, " -h, --help Display this usage.\n");
3049 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3050 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3051 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3052 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3053 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3054 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3055 fprintf(stderr, " -V, --version Show version number.\n");
3056 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3057 fprintf(stderr, " -q, --quiet No output at all.\n");
3058 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
31f73cc9 3059 fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
fac6795d
DG		 3060}
3061
3062/*
3063 * daemon argument parsing
3064 */
3065static int parse_args(int argc, char **argv)
3066{
3067 int c;
3068
3069 static struct option long_options[] = {
3070 { "client-sock", 1, 0, 'c' },
3071 { "apps-sock", 1, 0, 'a' },
d6f42150
DG		 3072 { "kconsumerd-cmd-sock", 1, 0, 0 },
3073 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 3074 { "daemonize", 0, 0, 'd' },
5b8719f5 3075 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3076 { "help", 0, 0, 'h' },
3077 { "group", 1, 0, 'g' },
3078 { "version", 0, 0, 'V' },
75462a81 3079 { "quiet", 0, 0, 'q' },
3f9947db 3080 { "verbose", 0, 0, 'v' },
31f73cc9 3081 { "verbose-kconsumerd", 0, 0, 'Z' },
fac6795d
DG		 3082 { NULL, 0, 0, 0 }
3083 };
3084
3085 while (1) {
3086 int option_index = 0;
54d01ffb
DG		 3087 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z",
3088 long_options, &option_index);
fac6795d
DG		 3089 if (c == -1) {
3090 break;
3091 }
3092
3093 switch (c) {
3094 case 0:
3095 fprintf(stderr, "option %s", long_options[option_index].name);
3096 if (optarg) {
3097 fprintf(stderr, " with arg %s\n", optarg);
3098 }
3099 break;
b716ce68 3100 case 'c':
fac6795d
DG		 3101 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3102 break;
3103 case 'a':
3104 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3105 break;
3106 case 'd':
3107 opt_daemon = 1;
3108 break;
3109 case 'g':
3110 opt_tracing_group = strdup(optarg);
3111 break;
3112 case 'h':
3113 usage();
3114 exit(EXIT_FAILURE);
3115 case 'V':
3116 fprintf(stdout, "%s\n", VERSION);
3117 exit(EXIT_SUCCESS);
5b8719f5
DG		 3118 case 'S':
3119 opt_sig_parent = 1;
3120 break;
d6f42150
DG		 3121 case 'E':
3122 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
3123 break;
3124 case 'C':
3125 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3126 break;
75462a81
DG		 3127 case 'q':
3128 opt_quiet = 1;
3129 break;
3f9947db 3130 case 'v':
53086306
DG		 3131 /* Verbose level can increase using multiple -v */
3132 opt_verbose += 1;
3f9947db 3133 break;
31f73cc9
MD		 3134 case 'Z':
3135 opt_verbose_kconsumerd += 1;
3136 break;
fac6795d
DG		 3137 default:
3138 /* Unknown option or other error.
3139 * Error is printed by getopt, just return */
3140 return -1;
3141 }
3142 }
3143
3144 return 0;
3145}
3146
3147/*
d063d709 3148 * Creates the two needed socket by the daemon.
d6f42150
DG		 3149 * apps_sock - The communication socket for all UST apps.
3150 * client_sock - The communication of the cli tool (lttng).
fac6795d 3151 */
cf3af59e 3152static int init_daemon_socket(void)
fac6795d
DG		 3153{
3154 int ret = 0;
3155 mode_t old_umask;
3156
3157 old_umask = umask(0);
3158
3159 /* Create client tool unix socket */
d6f42150
DG		 3160 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3161 if (client_sock < 0) {
3162 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3163 ret = -1;
3164 goto end;
3165 }
3166
3167 /* File permission MUST be 660 */
3168 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3169 if (ret < 0) {
d6f42150 3170 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3171 perror("chmod");
3172 goto end;
3173 }
3174
3175 /* Create the application unix socket */
d6f42150
DG		 3176 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3177 if (apps_sock < 0) {
3178 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3179 ret = -1;
3180 goto end;
3181 }
3182
d6f42150 3183 /* File permission MUST be 666 */
54d01ffb
DG		 3184 ret = chmod(apps_unix_sock_path,
3185 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3186 if (ret < 0) {
d6f42150 3187 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3188 perror("chmod");
3189 goto end;
3190 }
3191
3192end:
3193 umask(old_umask);
3194 return ret;
3195}
3196
3197/*
54d01ffb
DG		 3198 * Check if the global socket is available, and if a daemon is answering at the
3199 * other side. If yes, error is returned.
fac6795d 3200 */
cf3af59e 3201static int check_existing_daemon(void)
fac6795d 3202{
7d8234d9 3203 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3204 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3205 return 0;
099e26bd 3206 }
54d01ffb 3207
7d8234d9 3208 /* Is there anybody out there ? */
099e26bd 3209 if (lttng_session_daemon_alive()) {
7d8234d9 3210 return -EEXIST;
099e26bd 3211 } else {
7d8234d9 3212 return 0;
099e26bd 3213 }
fac6795d
DG		 3214}
3215
fac6795d 3216/*
d063d709 3217 * Set the tracing group gid onto the client socket.
5e16da05 3218 *
d063d709
DG		 3219 * Race window between mkdir and chown is OK because we are going from more
3220 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3221 */
d6f42150 3222static int set_permissions(void)
fac6795d
DG		 3223{
3224 int ret;
996b65c8 3225 gid_t gid;
fac6795d 3226
996b65c8
MD		 3227 gid = allowed_group();
3228 if (gid < 0) {
a463f419
DG		 3229 if (is_root) {
3230 WARN("No tracing group detected");
3231 ret = 0;
3232 } else {
3233 ERR("Missing tracing group. Aborting execution.");
3234 ret = -1;
3235 }
fac6795d
DG		 3236 goto end;
3237 }
3238
d6f42150 3239 /* Set lttng run dir */
996b65c8 3240 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG		 3241 if (ret < 0) {
3242 ERR("Unable to set group on " LTTNG_RUNDIR);
3243 perror("chown");
3244 }
3245
3246 /* lttng client socket path */
996b65c8 3247 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3248 if (ret < 0) {
d6f42150
DG		 3249 ERR("Unable to set group on %s", client_unix_sock_path);
3250 perror("chown");
3251 }
3252
3253 /* kconsumerd error socket path */
996b65c8 3254 ret = chown(kconsumerd_err_unix_sock_path, 0, gid);
d6f42150
DG		 3255 if (ret < 0) {
3256 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG		 3257 perror("chown");
3258 }
3259
d6f42150 3260 DBG("All permissions are set");
e07ae692 3261
fac6795d
DG		 3262end:
3263 return ret;
3264}
3265
7a485870 3266/*
d063d709 3267 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 3268 */
3269static int create_kernel_poll_pipe(void)
3270{
3271 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3272}
3273
099e26bd
DG		 3274/*
3275 * Create the application command pipe to wake thread_manage_apps.
3276 */
3277static int create_apps_cmd_pipe(void)
3278{
3279 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3280}
3281
d6f42150 3282/*
d063d709 3283 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG		 3284 */
3285static int create_lttng_rundir(void)
3286{
3287 int ret;
3288
3289 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
3290 if (ret < 0) {
b1f11e69
DG		 3291 if (errno != EEXIST) {
3292 ERR("Unable to create " LTTNG_RUNDIR);
3293 goto error;
3294 } else {
3295 ret = 0;
3296 }
d6f42150
DG		 3297 }
3298
3299error:
3300 return ret;
3301}
3302
3303/*
d063d709
DG		 3304 * Setup sockets and directory needed by the kconsumerd communication with the
3305 * session daemon.
d6f42150
DG		 3306 */
3307static int set_kconsumerd_sockets(void)
3308{
3309 int ret;
3310
3311 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
54d01ffb
DG		 3312 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX,
3313 KCONSUMERD_ERR_SOCK_PATH);
d6f42150
DG		 3314 }
3315
3316 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
54d01ffb
DG		 3317 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX,
3318 KCONSUMERD_CMD_SOCK_PATH);
d6f42150
DG		 3319 }
3320
3321 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
3322 if (ret < 0) {
6beb2242
DG		 3323 if (errno != EEXIST) {
3324 ERR("Failed to create " KCONSUMERD_PATH);
3325 goto error;
3326 }
3327 ret = 0;
d6f42150
DG		 3328 }
3329
3330 /* Create the kconsumerd error unix socket */
54d01ffb
DG		 3331 kconsumerd_err_sock =
3332 lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
d6f42150
DG		 3333 if (kconsumerd_err_sock < 0) {
3334 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
3335 ret = -1;
3336 goto error;
3337 }
3338
3339 /* File permission MUST be 660 */
54d01ffb
DG		 3340 ret = chmod(kconsumerd_err_unix_sock_path,
3341 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150
DG		 3342 if (ret < 0) {
3343 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
3344 perror("chmod");
3345 goto error;
3346 }
3347
3348error:
3349 return ret;
3350}
3351
fac6795d 3352/*
d063d709 3353 * Signal handler for the daemon
cf3af59e 3354 *
54d01ffb
DG		 3355 * Simply stop all worker threads, leaving main() return gracefully after
3356 * joining all threads and calling cleanup().
fac6795d
DG		 3357 */
3358static void sighandler(int sig)
3359{
3360 switch (sig) {
cf3af59e
MD		 3361 case SIGPIPE:
3362 DBG("SIGPIPE catched");
3363 return;
3364 case SIGINT:
3365 DBG("SIGINT catched");
3366 stop_threads();
3367 break;
3368 case SIGTERM:
3369 DBG("SIGTERM catched");
3370 stop_threads();
3371 break;
3372 default:
3373 break;
fac6795d 3374 }
fac6795d
DG		 3375}
3376
3377/*
d063d709 3378 * Setup signal handler for :
1d4b027a 3379 * SIGINT, SIGTERM, SIGPIPE
fac6795d 3380 */
1d4b027a 3381static int set_signal_handler(void)
fac6795d 3382{
1d4b027a
DG		 3383 int ret = 0;
3384 struct sigaction sa;
3385 sigset_t sigset;
fac6795d 3386
1d4b027a
DG		 3387 if ((ret = sigemptyset(&sigset)) < 0) {
3388 perror("sigemptyset");
3389 return ret;
3390 }
d6f42150 3391
1d4b027a
DG		 3392 sa.sa_handler = sighandler;
3393 sa.sa_mask = sigset;
3394 sa.sa_flags = 0;
3395 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
3396 perror("sigaction");
3397 return ret;
d6f42150
DG		 3398 }
3399
1d4b027a
DG		 3400 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
3401 perror("sigaction");
3402 return ret;
d6f42150 3403 }
aaf26714 3404
1d4b027a
DG		 3405 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
3406 perror("sigaction");
3407 return ret;
8c0faa1d
DG		 3408 }
3409
1d4b027a
DG		 3410 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3411
3412 return ret;
fac6795d
DG		 3413}
3414
f3ed775e 3415/*
d063d709
DG		 3416 * Set open files limit to unlimited. This daemon can open a large number of
3417 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 3418 */
3419static void set_ulimit(void)
3420{
3421 int ret;
3422 struct rlimit lim;
3423
a88df331 3424 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 3425 lim.rlim_cur = 65535;
3426 lim.rlim_max = 65535;
3427
3428 ret = setrlimit(RLIMIT_NOFILE, &lim);
3429 if (ret < 0) {
3430 perror("failed to set open files limit");
3431 }
3432}
3433
fac6795d
DG		 3434/*
3435 * main
3436 */
3437int main(int argc, char **argv)
3438{
fac6795d
DG		 3439 int ret = 0;
3440 void *status;
b082db07 3441 const char *home_path;
fac6795d 3442
273ea72c 3443 /* Create thread quit pipe */
cf3af59e
MD		 3444 if ((ret = init_thread_quit_pipe()) < 0) {
3445 goto error;
273ea72c
DG		 3446 }
3447
fac6795d
DG		 3448 /* Parse arguments */
3449 progname = argv[0];
3450 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 3451 goto error;
fac6795d
DG		 3452 }
3453
3454 /* Daemonize */
3455 if (opt_daemon) {
53094c05
DG		 3456 ret = daemon(0, 0);
3457 if (ret < 0) {
3458 perror("daemon");
cf3af59e 3459 goto error;
53094c05 3460 }
fac6795d
DG		 3461 }
3462
3463 /* Check if daemon is UID = 0 */
3464 is_root = !getuid();
3465
fac6795d 3466 if (is_root) {
d6f42150
DG		 3467 ret = create_lttng_rundir();
3468 if (ret < 0) {
cf3af59e 3469 goto error;
d6f42150
DG		 3470 }
3471
fac6795d 3472 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 3473 snprintf(apps_unix_sock_path, PATH_MAX,
3474 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 3475 }
3476
3477 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 3478 snprintf(client_unix_sock_path, PATH_MAX,
3479 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
3480 }
0fdd1e2c
DG		 3481
3482 /* Set global SHM for ust */
3483 if (strlen(wait_shm_path) == 0) {
3484 snprintf(wait_shm_path, PATH_MAX,
3485 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
3486 }
fac6795d 3487 } else {
b082db07
DG		 3488 home_path = get_home_dir();
3489 if (home_path == NULL) {
273ea72c
DG		 3490 /* TODO: Add --socket PATH option */
3491 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 3492 ret = -EPERM;
3493 goto error;
b082db07
DG		 3494 }
3495
fac6795d 3496 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 3497 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 3498 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 3499 }
3500
3501 /* Set the cli tool unix socket path */
3502 if (strlen(client_unix_sock_path) == 0) {
d6f42150 3503 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 3504 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 3505 }
0fdd1e2c
DG		 3506
3507 /* Set global SHM for ust */
3508 if (strlen(wait_shm_path) == 0) {
3509 snprintf(wait_shm_path, PATH_MAX,
3510 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
3511 }
fac6795d
DG		 3512 }
3513
847177cd
DG		 3514 DBG("Client socket path %s", client_unix_sock_path);
3515 DBG("Application socket path %s", apps_unix_sock_path);
3516
273ea72c 3517 /*
7d8234d9 3518 * See if daemon already exist.
fac6795d 3519 */
7d8234d9 3520 if ((ret = check_existing_daemon()) < 0) {
75462a81 3521 ERR("Already running daemon.\n");
273ea72c 3522 /*
cf3af59e
MD		 3523 * We do not goto exit because we must not cleanup()
3524 * because a daemon is already running.
ab118b20 3525 */
cf3af59e 3526 goto error;
a88df331
DG		 3527 }
3528
54d01ffb 3529 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 3530
3531 /*
3532 * These actions must be executed as root. We do that *after* setting up
3533 * the sockets path because we MUST make the check for another daemon using
3534 * those paths *before* trying to set the kernel consumer sockets and init
3535 * kernel tracer.
3536 */
3537 if (is_root) {
3538 ret = set_kconsumerd_sockets();
3539 if (ret < 0) {
cf3af59e 3540 goto exit;
a88df331
DG		 3541 }
3542
3543 /* Setup kernel tracer */
3544 init_kernel_tracer();
3545
3546 /* Set ulimit for open files */
3547 set_ulimit();
fac6795d
DG		 3548 }
3549
cf3af59e
MD		 3550 if ((ret = set_signal_handler()) < 0) {
3551 goto exit;
fac6795d
DG		 3552 }
3553
d6f42150 3554 /* Setup the needed unix socket */
cf3af59e
MD		 3555 if ((ret = init_daemon_socket()) < 0) {
3556 goto exit;
fac6795d
DG		 3557 }
3558
3559 /* Set credentials to socket */
cf3af59e
MD		 3560 if (is_root && ((ret = set_permissions()) < 0)) {
3561 goto exit;
fac6795d
DG		 3562 }
3563
5b8719f5
DG		 3564 /* Get parent pid if -S, --sig-parent is specified. */
3565 if (opt_sig_parent) {
3566 ppid = getppid();
3567 }
3568
7a485870 3569 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 3570 if ((ret = create_kernel_poll_pipe()) < 0) {
3571 goto exit;
7a485870
DG		 3572 }
3573
099e26bd
DG		 3574 /* Setup the thread apps communication pipe. */
3575 if ((ret = create_apps_cmd_pipe()) < 0) {
3576 goto exit;
3577 }
3578
3579 /* Init UST command queue. */
3580 cds_wfq_init(&ust_cmd_queue.queue);
3581
273ea72c 3582 /*
54d01ffb
DG		 3583 * Get session list pointer. This pointer MUST NOT be free(). This list is
3584 * statically declared in session.c
273ea72c 3585 */
54d01ffb 3586 session_list_ptr = session_get_list();
b5541356 3587
5eb91c98
DG		 3588 /* Set up max poll set size */
3589 lttng_poll_set_max_size();
3590
cf3af59e 3591 /* Create thread to manage the client socket */
099e26bd
DG		 3592 ret = pthread_create(&client_thread, NULL,
3593 thread_manage_clients, (void *) NULL);
cf3af59e 3594 if (ret != 0) {
099e26bd 3595 perror("pthread_create clients");
cf3af59e
MD		 3596 goto exit_client;
3597 }
fac6795d 3598
099e26bd
DG		 3599 /* Create thread to dispatch registration */
3600 ret = pthread_create(&dispatch_thread, NULL,
3601 thread_dispatch_ust_registration, (void *) NULL);
3602 if (ret != 0) {
3603 perror("pthread_create dispatch");
3604 goto exit_dispatch;
3605 }
3606
3607 /* Create thread to manage application registration. */
3608 ret = pthread_create(&reg_apps_thread, NULL,
3609 thread_registration_apps, (void *) NULL);
3610 if (ret != 0) {
3611 perror("pthread_create registration");
3612 goto exit_reg_apps;
3613 }
3614
cf3af59e 3615 /* Create thread to manage application socket */
54d01ffb
DG		 3616 ret = pthread_create(&apps_thread, NULL,
3617 thread_manage_apps, (void *) NULL);
cf3af59e 3618 if (ret != 0) {
099e26bd 3619 perror("pthread_create apps");
cf3af59e
MD		 3620 goto exit_apps;
3621 }
fac6795d 3622
cf3af59e 3623 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 3624 ret = pthread_create(&kernel_thread, NULL,
3625 thread_manage_kernel, (void *) NULL);
cf3af59e 3626 if (ret != 0) {
099e26bd 3627 perror("pthread_create kernel");
cf3af59e
MD		 3628 goto exit_kernel;
3629 }
7a485870 3630
cf3af59e
MD		 3631 ret = pthread_join(kernel_thread, &status);
3632 if (ret != 0) {
3633 perror("pthread_join");
3634 goto error; /* join error, exit without cleanup */
fac6795d
DG		 3635 }
3636
cf3af59e
MD		 3637exit_kernel:
3638 ret = pthread_join(apps_thread, &status);
3639 if (ret != 0) {
3640 perror("pthread_join");
3641 goto error; /* join error, exit without cleanup */
3642 }
fac6795d 3643
cf3af59e 3644exit_apps:
099e26bd
DG		 3645 ret = pthread_join(reg_apps_thread, &status);
3646 if (ret != 0) {
3647 perror("pthread_join");
3648 goto error; /* join error, exit without cleanup */
3649 }
3650
3651exit_reg_apps:
3652 ret = pthread_join(dispatch_thread, &status);
3653 if (ret != 0) {
3654 perror("pthread_join");
3655 goto error; /* join error, exit without cleanup */
3656 }
3657
3658exit_dispatch:
cf3af59e
MD		 3659 ret = pthread_join(client_thread, &status);
3660 if (ret != 0) {
3661 perror("pthread_join");
3662 goto error; /* join error, exit without cleanup */
3663 }
3664
3665 ret = join_kconsumerd_thread();
3666 if (ret != 0) {
3667 perror("join_kconsumerd");
3668 goto error; /* join error, exit without cleanup */
3669 }
a88df331 3670
cf3af59e 3671exit_client:
a88df331 3672exit:
cf3af59e
MD		 3673 /*
3674 * cleanup() is called when no other thread is running.
3675 */
3676 cleanup();
3677 if (!ret)
3678 exit(EXIT_SUCCESS);
3679error:
5e16da05 3680 exit(EXIT_FAILURE);
fac6795d 3681}
LTTng tools - Deliverables
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