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Merge branch 'master' into benchmark
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
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.
8 *
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.
13 *
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.
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>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 #include "benchmark.h"
79
80 /* Const values */
81 const char default_home_dir[] = DEFAULT_HOME_DIR;
82 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
83 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
86 /* Variables */
87 int opt_verbose; /* Not static for lttngerr.h */
88 int opt_verbose_consumer; /* Not static for lttngerr.h */
89 int opt_quiet; /* Not static for lttngerr.h */
90
91 const char *progname;
92 const char *opt_tracing_group;
93 static int opt_sig_parent;
94 static int opt_daemon;
95 static int opt_no_kernel;
96 static int is_root; /* Set to 1 if the daemon is running as root */
97 static pid_t ppid; /* Parent PID for --sig-parent option */
98 static char *rundir;
99
100 /* Consumer daemon specific control data */
101 static struct consumer_data kconsumer_data = {
102 .type = LTTNG_CONSUMER_KERNEL,
103 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
105 };
106 static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
108 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
110 };
111 static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
113 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
115 };
116
117 static int dispatch_thread_exit;
118
119 /* Global application Unix socket path */
120 static char apps_unix_sock_path[PATH_MAX];
121 /* Global client Unix socket path */
122 static char client_unix_sock_path[PATH_MAX];
123 /* global wait shm path for UST */
124 static char wait_shm_path[PATH_MAX];
125
126 /* Sockets and FDs */
127 static int client_sock;
128 static int apps_sock;
129 static int kernel_tracer_fd;
130 static int kernel_poll_pipe[2];
131
132 /*
133 * Quit pipe for all threads. This permits a single cancellation point
134 * for all threads when receiving an event on the pipe.
135 */
136 static int thread_quit_pipe[2];
137
138 /*
139 * This pipe is used to inform the thread managing application communication
140 * that a command is queued and ready to be processed.
141 */
142 static int apps_cmd_pipe[2];
143
144 /* Pthread, Mutexes and Semaphores */
145 static pthread_t apps_thread;
146 static pthread_t reg_apps_thread;
147 static pthread_t client_thread;
148 static pthread_t kernel_thread;
149 static pthread_t dispatch_thread;
150
151
152 /*
153 * UST registration command queue. This queue is tied with a futex and uses a N
154 * wakers / 1 waiter implemented and detailed in futex.c/.h
155 *
156 * The thread_manage_apps and thread_dispatch_ust_registration interact with
157 * this queue and the wait/wake scheme.
158 */
159 static struct ust_cmd_queue ust_cmd_queue;
160
161 /*
162 * Pointer initialized before thread creation.
163 *
164 * This points to the tracing session list containing the session count and a
165 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
166 * MUST NOT be taken if you call a public function in session.c.
167 *
168 * The lock is nested inside the structure: session_list_ptr->lock. Please use
169 * session_lock_list and session_unlock_list for lock acquisition.
170 */
171 static struct ltt_session_list *session_list_ptr;
172
173 int ust_consumerd64_fd = -1;
174 int ust_consumerd32_fd = -1;
175
176 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
177 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
178 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
179 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
180
181 static
182 void setup_consumerd_path(void)
183 {
184 const char *bin, *libdir;
185
186 /*
187 * Allow INSTALL_BIN_PATH to be used as a target path for the
188 * native architecture size consumer if CONFIG_CONSUMER*_PATH
189 * has not been defined.
190 */
191 #if (CAA_BITS_PER_LONG == 32)
192 if (!consumerd32_bin[0]) {
193 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
194 }
195 if (!consumerd32_libdir[0]) {
196 consumerd32_libdir = INSTALL_LIB_PATH;
197 }
198 #elif (CAA_BITS_PER_LONG == 64)
199 if (!consumerd64_bin[0]) {
200 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
201 }
202 if (!consumerd64_libdir[0]) {
203 consumerd64_libdir = INSTALL_LIB_PATH;
204 }
205 #else
206 #error "Unknown bitness"
207 #endif
208
209 /*
210 * runtime env. var. overrides the build default.
211 */
212 bin = getenv("LTTNG_CONSUMERD32_BIN");
213 if (bin) {
214 consumerd32_bin = bin;
215 }
216 bin = getenv("LTTNG_CONSUMERD64_BIN");
217 if (bin) {
218 consumerd64_bin = bin;
219 }
220 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
221 if (libdir) {
222 consumerd32_libdir = libdir;
223 }
224 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
225 if (libdir) {
226 consumerd64_libdir = libdir;
227 }
228 }
229
230 /*
231 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
232 */
233 static int create_thread_poll_set(struct lttng_poll_event *events,
234 unsigned int size)
235 {
236 int ret;
237
238 if (events == NULL || size == 0) {
239 ret = -1;
240 goto error;
241 }
242
243 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
244 if (ret < 0) {
245 goto error;
246 }
247
248 /* Add quit pipe */
249 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
250 if (ret < 0) {
251 goto error;
252 }
253
254 return 0;
255
256 error:
257 return ret;
258 }
259
260 /*
261 * Check if the thread quit pipe was triggered.
262 *
263 * Return 1 if it was triggered else 0;
264 */
265 static int check_thread_quit_pipe(int fd, uint32_t events)
266 {
267 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
268 return 1;
269 }
270
271 return 0;
272 }
273
274 /*
275 * Return group ID of the tracing group or -1 if not found.
276 */
277 static gid_t allowed_group(void)
278 {
279 struct group *grp;
280
281 if (opt_tracing_group) {
282 grp = getgrnam(opt_tracing_group);
283 } else {
284 grp = getgrnam(default_tracing_group);
285 }
286 if (!grp) {
287 return -1;
288 } else {
289 return grp->gr_gid;
290 }
291 }
292
293 /*
294 * Init thread quit pipe.
295 *
296 * Return -1 on error or 0 if all pipes are created.
297 */
298 static int init_thread_quit_pipe(void)
299 {
300 int ret;
301
302 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
303 if (ret < 0) {
304 perror("thread quit pipe");
305 goto error;
306 }
307
308 error:
309 return ret;
310 }
311
312 /*
313 * Complete teardown of a kernel session. This free all data structure related
314 * to a kernel session and update counter.
315 */
316 static void teardown_kernel_session(struct ltt_session *session)
317 {
318 if (!session->kernel_session) {
319 DBG3("No kernel session when tearingdown session");
320 return;
321 }
322
323 DBG("Tearing down kernel session");
324
325 /*
326 * If a custom kernel consumer was registered, close the socket before
327 * tearing down the complete kernel session structure
328 */
329 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
330 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
331 }
332
333 trace_kernel_destroy_session(session->kernel_session);
334 }
335
336 /*
337 * Complete teardown of all UST sessions. This will free everything on his path
338 * and destroy the core essence of all ust sessions :)
339 */
340 static void teardown_ust_session(struct ltt_session *session)
341 {
342 int ret;
343
344 if (!session->ust_session) {
345 DBG3("No UST session when tearingdown session");
346 return;
347 }
348
349 DBG("Tearing down UST session(s)");
350
351 ret = ust_app_destroy_trace_all(session->ust_session);
352 if (ret) {
353 ERR("Error in ust_app_destroy_trace_all");
354 }
355
356 trace_ust_destroy_session(session->ust_session);
357 }
358
359 /*
360 * Stop all threads by closing the thread quit pipe.
361 */
362 static void stop_threads(void)
363 {
364 int ret;
365
366 /* Stopping all threads */
367 DBG("Terminating all threads");
368 ret = notify_thread_pipe(thread_quit_pipe[1]);
369 if (ret < 0) {
370 ERR("write error on thread quit pipe");
371 }
372
373 /* Dispatch thread */
374 dispatch_thread_exit = 1;
375 futex_nto1_wake(&ust_cmd_queue.futex);
376 }
377
378 /*
379 * Cleanup the daemon
380 */
381 static void cleanup(void)
382 {
383 int ret;
384 char *cmd;
385 struct ltt_session *sess, *stmp;
386
387 DBG("Cleaning up");
388
389 DBG("Removing %s directory", rundir);
390 ret = asprintf(&cmd, "rm -rf %s", rundir);
391 if (ret < 0) {
392 ERR("asprintf failed. Something is really wrong!");
393 }
394
395 /* Remove lttng run directory */
396 ret = system(cmd);
397 if (ret < 0) {
398 ERR("Unable to clean %s", rundir);
399 }
400 free(cmd);
401
402 DBG("Cleaning up all session");
403
404 /* Destroy session list mutex */
405 if (session_list_ptr != NULL) {
406 pthread_mutex_destroy(&session_list_ptr->lock);
407
408 /* Cleanup ALL session */
409 cds_list_for_each_entry_safe(sess, stmp,
410 &session_list_ptr->head, list) {
411 teardown_kernel_session(sess);
412 teardown_ust_session(sess);
413 free(sess);
414 }
415 }
416
417 DBG("Closing all UST sockets");
418 ust_app_clean_list();
419
420 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
421
422 if (is_root && !opt_no_kernel) {
423 DBG2("Closing kernel fd");
424 close(kernel_tracer_fd);
425 DBG("Unloading kernel modules");
426 modprobe_remove_lttng_all();
427 }
428
429 close(thread_quit_pipe[0]);
430 close(thread_quit_pipe[1]);
431
432 /* OUTPUT BENCHMARK RESULTS */
433 bench_init();
434
435 if (getenv("BENCH_UST_NOTIFY")) {
436 bench_print_ust_notification();
437 }
438
439 if (getenv("BENCH_UST_REGISTER")) {
440 bench_print_ust_register();
441 bench_print_ust_unregister();
442 }
443
444 if (getenv("BENCH_BOOT_PROCESS")) {
445 bench_print_boot_process();
446 }
447
448 bench_close();
449 /* END BENCHMARK */
450
451 /* <fun> */
452 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
453 "Matthew, BEET driven development works!%c[%dm",
454 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
455 /* </fun> */
456 }
457
458 /*
459 * Send data on a unix socket using the liblttsessiondcomm API.
460 *
461 * Return lttcomm error code.
462 */
463 static int send_unix_sock(int sock, void *buf, size_t len)
464 {
465 /* Check valid length */
466 if (len <= 0) {
467 return -1;
468 }
469
470 return lttcomm_send_unix_sock(sock, buf, len);
471 }
472
473 /*
474 * Free memory of a command context structure.
475 */
476 static void clean_command_ctx(struct command_ctx **cmd_ctx)
477 {
478 DBG("Clean command context structure");
479 if (*cmd_ctx) {
480 if ((*cmd_ctx)->llm) {
481 free((*cmd_ctx)->llm);
482 }
483 if ((*cmd_ctx)->lsm) {
484 free((*cmd_ctx)->lsm);
485 }
486 free(*cmd_ctx);
487 *cmd_ctx = NULL;
488 }
489 }
490
491 /*
492 * Send all stream fds of kernel channel to the consumer.
493 */
494 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
495 int sock, struct ltt_kernel_channel *channel,
496 uid_t uid, gid_t gid)
497 {
498 int ret;
499 struct ltt_kernel_stream *stream;
500 struct lttcomm_consumer_msg lkm;
501
502 DBG("Sending streams of channel %s to kernel consumer",
503 channel->channel->name);
504
505 /* Send channel */
506 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
507 lkm.u.channel.channel_key = channel->fd;
508 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
509 lkm.u.channel.mmap_len = 0; /* for kernel */
510 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
511 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
512 if (ret < 0) {
513 perror("send consumer channel");
514 goto error;
515 }
516
517 /* Send streams */
518 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
519 if (!stream->fd) {
520 continue;
521 }
522 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
523 lkm.u.stream.channel_key = channel->fd;
524 lkm.u.stream.stream_key = stream->fd;
525 lkm.u.stream.state = stream->state;
526 lkm.u.stream.output = channel->channel->attr.output;
527 lkm.u.stream.mmap_len = 0; /* for kernel */
528 lkm.u.stream.uid = uid;
529 lkm.u.stream.gid = gid;
530 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
531 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
532 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
533 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
534 if (ret < 0) {
535 perror("send consumer stream");
536 goto error;
537 }
538 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
539 if (ret < 0) {
540 perror("send consumer stream ancillary data");
541 goto error;
542 }
543 }
544
545 DBG("consumer channel streams sent");
546
547 return 0;
548
549 error:
550 return ret;
551 }
552
553 /*
554 * Send all stream fds of the kernel session to the consumer.
555 */
556 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
557 struct ltt_kernel_session *session)
558 {
559 int ret;
560 struct ltt_kernel_channel *chan;
561 struct lttcomm_consumer_msg lkm;
562 int sock = session->consumer_fd;
563
564 DBG("Sending metadata stream fd");
565
566 /* Extra protection. It's NOT supposed to be set to 0 at this point */
567 if (session->consumer_fd == 0) {
568 session->consumer_fd = consumer_data->cmd_sock;
569 }
570
571 if (session->metadata_stream_fd != 0) {
572 /* Send metadata channel fd */
573 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
574 lkm.u.channel.channel_key = session->metadata->fd;
575 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
576 lkm.u.channel.mmap_len = 0; /* for kernel */
577 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
578 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
579 if (ret < 0) {
580 perror("send consumer channel");
581 goto error;
582 }
583
584 /* Send metadata stream fd */
585 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
586 lkm.u.stream.channel_key = session->metadata->fd;
587 lkm.u.stream.stream_key = session->metadata_stream_fd;
588 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
589 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
590 lkm.u.stream.mmap_len = 0; /* for kernel */
591 lkm.u.stream.uid = session->uid;
592 lkm.u.stream.gid = session->gid;
593 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
594 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
595 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
596 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
597 if (ret < 0) {
598 perror("send consumer stream");
599 goto error;
600 }
601 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
602 if (ret < 0) {
603 perror("send consumer stream");
604 goto error;
605 }
606 }
607
608 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
609 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
610 session->uid, session->gid);
611 if (ret < 0) {
612 goto error;
613 }
614 }
615
616 DBG("consumer fds (metadata and channel streams) sent");
617
618 return 0;
619
620 error:
621 return ret;
622 }
623
624 /*
625 * Notify UST applications using the shm mmap futex.
626 */
627 static int notify_ust_apps(int active)
628 {
629 char *wait_shm_mmap;
630
631 DBG("Notifying applications of session daemon state: %d", active);
632
633 tracepoint(ust_notify_apps_start);
634
635 /* See shm.c for this call implying mmap, shm and futex calls */
636 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
637 if (wait_shm_mmap == NULL) {
638 goto error;
639 }
640
641 /* Wake waiting process */
642 futex_wait_update((int32_t *) wait_shm_mmap, active);
643
644 tracepoint(ust_notify_apps_stop);
645
646 /* Apps notified successfully */
647 return 0;
648
649 error:
650 return -1;
651 }
652
653 /*
654 * Setup the outgoing data buffer for the response (llm) by allocating the
655 * right amount of memory and copying the original information from the lsm
656 * structure.
657 *
658 * Return total size of the buffer pointed by buf.
659 */
660 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
661 {
662 int ret, buf_size;
663
664 buf_size = size;
665
666 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
667 if (cmd_ctx->llm == NULL) {
668 perror("zmalloc");
669 ret = -ENOMEM;
670 goto error;
671 }
672
673 /* Copy common data */
674 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
675 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
676
677 cmd_ctx->llm->data_size = size;
678 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
679
680 return buf_size;
681
682 error:
683 return ret;
684 }
685
686 /*
687 * Update the kernel poll set of all channel fd available over all tracing
688 * session. Add the wakeup pipe at the end of the set.
689 */
690 static int update_kernel_poll(struct lttng_poll_event *events)
691 {
692 int ret;
693 struct ltt_session *session;
694 struct ltt_kernel_channel *channel;
695
696 DBG("Updating kernel poll set");
697
698 session_lock_list();
699 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
700 session_lock(session);
701 if (session->kernel_session == NULL) {
702 session_unlock(session);
703 continue;
704 }
705
706 cds_list_for_each_entry(channel,
707 &session->kernel_session->channel_list.head, list) {
708 /* Add channel fd to the kernel poll set */
709 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
710 if (ret < 0) {
711 session_unlock(session);
712 goto error;
713 }
714 DBG("Channel fd %d added to kernel set", channel->fd);
715 }
716 session_unlock(session);
717 }
718 session_unlock_list();
719
720 return 0;
721
722 error:
723 session_unlock_list();
724 return -1;
725 }
726
727 /*
728 * Find the channel fd from 'fd' over all tracing session. When found, check
729 * for new channel stream and send those stream fds to the kernel consumer.
730 *
731 * Useful for CPU hotplug feature.
732 */
733 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
734 {
735 int ret = 0;
736 struct ltt_session *session;
737 struct ltt_kernel_channel *channel;
738
739 DBG("Updating kernel streams for channel fd %d", fd);
740
741 session_lock_list();
742 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
743 session_lock(session);
744 if (session->kernel_session == NULL) {
745 session_unlock(session);
746 continue;
747 }
748
749 /* This is not suppose to be 0 but this is an extra security check */
750 if (session->kernel_session->consumer_fd == 0) {
751 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
752 }
753
754 cds_list_for_each_entry(channel,
755 &session->kernel_session->channel_list.head, list) {
756 if (channel->fd == fd) {
757 DBG("Channel found, updating kernel streams");
758 ret = kernel_open_channel_stream(channel);
759 if (ret < 0) {
760 goto error;
761 }
762
763 /*
764 * Have we already sent fds to the consumer? If yes, it means
765 * that tracing is started so it is safe to send our updated
766 * stream fds.
767 */
768 if (session->kernel_session->consumer_fds_sent == 1) {
769 ret = send_kconsumer_channel_streams(consumer_data,
770 session->kernel_session->consumer_fd, channel,
771 session->uid, session->gid);
772 if (ret < 0) {
773 goto error;
774 }
775 }
776 goto error;
777 }
778 }
779 session_unlock(session);
780 }
781 session_unlock_list();
782 return ret;
783
784 error:
785 session_unlock(session);
786 session_unlock_list();
787 return ret;
788 }
789
790 /*
791 * For each tracing session, update newly registered apps.
792 */
793 static void update_ust_app(int app_sock)
794 {
795 struct ltt_session *sess, *stmp;
796
797 /* For all tracing session(s) */
798 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
799 if (sess->ust_session) {
800 ust_app_global_update(sess->ust_session, app_sock);
801 }
802 }
803 }
804
805 /*
806 * This thread manage event coming from the kernel.
807 *
808 * Features supported in this thread:
809 * -) CPU Hotplug
810 */
811 static void *thread_manage_kernel(void *data)
812 {
813 int ret, i, pollfd, update_poll_flag = 1;
814 uint32_t revents, nb_fd;
815 char tmp;
816 struct lttng_poll_event events;
817
818 tracepoint(sessiond_th_kern_start);
819
820 DBG("Thread manage kernel started");
821
822 ret = create_thread_poll_set(&events, 2);
823 if (ret < 0) {
824 goto error;
825 }
826
827 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
828 if (ret < 0) {
829 goto error;
830 }
831
832 while (1) {
833 if (update_poll_flag == 1) {
834 /*
835 * Reset number of fd in the poll set. Always 2 since there is the thread
836 * quit pipe and the kernel pipe.
837 */
838 events.nb_fd = 2;
839
840 ret = update_kernel_poll(&events);
841 if (ret < 0) {
842 goto error;
843 }
844 update_poll_flag = 0;
845 }
846
847 nb_fd = LTTNG_POLL_GETNB(&events);
848
849 DBG("Thread kernel polling on %d fds", nb_fd);
850
851 /* Zeroed the poll events */
852 lttng_poll_reset(&events);
853
854 tracepoint(sessiond_th_kern_poll);
855
856 /* Poll infinite value of time */
857 ret = lttng_poll_wait(&events, -1);
858 if (ret < 0) {
859 goto error;
860 } else if (ret == 0) {
861 /* Should not happen since timeout is infinite */
862 ERR("Return value of poll is 0 with an infinite timeout.\n"
863 "This should not have happened! Continuing...");
864 continue;
865 }
866
867 for (i = 0; i < nb_fd; i++) {
868 /* Fetch once the poll data */
869 revents = LTTNG_POLL_GETEV(&events, i);
870 pollfd = LTTNG_POLL_GETFD(&events, i);
871
872 /* Thread quit pipe has been closed. Killing thread. */
873 ret = check_thread_quit_pipe(pollfd, revents);
874 if (ret) {
875 goto error;
876 }
877
878 /* Check for data on kernel pipe */
879 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
880 ret = read(kernel_poll_pipe[0], &tmp, 1);
881 update_poll_flag = 1;
882 continue;
883 } else {
884 /*
885 * New CPU detected by the kernel. Adding kernel stream to
886 * kernel session and updating the kernel consumer
887 */
888 if (revents & LPOLLIN) {
889 ret = update_kernel_stream(&kconsumer_data, pollfd);
890 if (ret < 0) {
891 continue;
892 }
893 break;
894 /*
895 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
896 * and unregister kernel stream at this point.
897 */
898 }
899 }
900 }
901 }
902
903 error:
904 DBG("Kernel thread dying");
905 close(kernel_poll_pipe[0]);
906 close(kernel_poll_pipe[1]);
907
908 lttng_poll_clean(&events);
909
910 return NULL;
911 }
912
913 /*
914 * This thread manage the consumer error sent back to the session daemon.
915 */
916 static void *thread_manage_consumer(void *data)
917 {
918 int sock = 0, i, ret, pollfd;
919 uint32_t revents, nb_fd;
920 enum lttcomm_return_code code;
921 struct lttng_poll_event events;
922 struct consumer_data *consumer_data = data;
923
924 tracepoint(sessiond_th_kcon_start);
925
926 DBG("[thread] Manage consumer started");
927
928 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
929 if (ret < 0) {
930 goto error;
931 }
932
933 /*
934 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
935 * Nothing more will be added to this poll set.
936 */
937 ret = create_thread_poll_set(&events, 2);
938 if (ret < 0) {
939 goto error;
940 }
941
942 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
943 if (ret < 0) {
944 goto error;
945 }
946
947 nb_fd = LTTNG_POLL_GETNB(&events);
948
949 tracepoint(sessiond_th_kcon_poll);
950
951 /* Inifinite blocking call, waiting for transmission */
952 ret = lttng_poll_wait(&events, -1);
953 if (ret < 0) {
954 goto error;
955 }
956
957 for (i = 0; i < nb_fd; i++) {
958 /* Fetch once the poll data */
959 revents = LTTNG_POLL_GETEV(&events, i);
960 pollfd = LTTNG_POLL_GETFD(&events, i);
961
962 /* Thread quit pipe has been closed. Killing thread. */
963 ret = check_thread_quit_pipe(pollfd, revents);
964 if (ret) {
965 goto error;
966 }
967
968 /* Event on the registration socket */
969 if (pollfd == consumer_data->err_sock) {
970 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
971 ERR("consumer err socket poll error");
972 goto error;
973 }
974 }
975 }
976
977 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
978 if (sock < 0) {
979 goto error;
980 }
981
982 DBG2("Receiving code from consumer err_sock");
983
984 /* Getting status code from kconsumerd */
985 ret = lttcomm_recv_unix_sock(sock, &code,
986 sizeof(enum lttcomm_return_code));
987 if (ret <= 0) {
988 goto error;
989 }
990
991 if (code == CONSUMERD_COMMAND_SOCK_READY) {
992 consumer_data->cmd_sock =
993 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
994 if (consumer_data->cmd_sock < 0) {
995 sem_post(&consumer_data->sem);
996 PERROR("consumer connect");
997 goto error;
998 }
999 /* Signal condition to tell that the kconsumerd is ready */
1000 sem_post(&consumer_data->sem);
1001 DBG("consumer command socket ready");
1002 } else {
1003 ERR("consumer error when waiting for SOCK_READY : %s",
1004 lttcomm_get_readable_code(-code));
1005 goto error;
1006 }
1007
1008 /* Remove the kconsumerd error sock since we've established a connexion */
1009 ret = lttng_poll_del(&events, consumer_data->err_sock);
1010 if (ret < 0) {
1011 goto error;
1012 }
1013
1014 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1015 if (ret < 0) {
1016 goto error;
1017 }
1018
1019 /* Update number of fd */
1020 nb_fd = LTTNG_POLL_GETNB(&events);
1021
1022 /* Inifinite blocking call, waiting for transmission */
1023 ret = lttng_poll_wait(&events, -1);
1024 if (ret < 0) {
1025 goto error;
1026 }
1027
1028 for (i = 0; i < nb_fd; i++) {
1029 /* Fetch once the poll data */
1030 revents = LTTNG_POLL_GETEV(&events, i);
1031 pollfd = LTTNG_POLL_GETFD(&events, i);
1032
1033 /* Thread quit pipe has been closed. Killing thread. */
1034 ret = check_thread_quit_pipe(pollfd, revents);
1035 if (ret) {
1036 goto error;
1037 }
1038
1039 /* Event on the kconsumerd socket */
1040 if (pollfd == sock) {
1041 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1042 ERR("consumer err socket second poll error");
1043 goto error;
1044 }
1045 }
1046 }
1047
1048 /* Wait for any kconsumerd error */
1049 ret = lttcomm_recv_unix_sock(sock, &code,
1050 sizeof(enum lttcomm_return_code));
1051 if (ret <= 0) {
1052 ERR("consumer closed the command socket");
1053 goto error;
1054 }
1055
1056 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1057
1058 error:
1059 DBG("consumer thread dying");
1060 close(consumer_data->err_sock);
1061 close(consumer_data->cmd_sock);
1062 close(sock);
1063
1064 unlink(consumer_data->err_unix_sock_path);
1065 unlink(consumer_data->cmd_unix_sock_path);
1066 consumer_data->pid = 0;
1067
1068 lttng_poll_clean(&events);
1069
1070 return NULL;
1071 }
1072
1073 /*
1074 * This thread manage application communication.
1075 */
1076 static void *thread_manage_apps(void *data)
1077 {
1078 int i, ret, pollfd;
1079 uint32_t revents, nb_fd;
1080 struct ust_command ust_cmd;
1081 struct lttng_poll_event events;
1082
1083 tracepoint(sessiond_th_apps_start);
1084
1085 DBG("[thread] Manage application started");
1086
1087 rcu_register_thread();
1088 rcu_thread_online();
1089
1090 ret = create_thread_poll_set(&events, 2);
1091 if (ret < 0) {
1092 goto error;
1093 }
1094
1095 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1096 if (ret < 0) {
1097 goto error;
1098 }
1099
1100 while (1) {
1101 /* Zeroed the events structure */
1102 lttng_poll_reset(&events);
1103
1104 nb_fd = LTTNG_POLL_GETNB(&events);
1105
1106 DBG("Apps thread polling on %d fds", nb_fd);
1107
1108 tracepoint(sessiond_th_apps_poll);
1109
1110 /* Inifinite blocking call, waiting for transmission */
1111 ret = lttng_poll_wait(&events, -1);
1112 if (ret < 0) {
1113 goto error;
1114 }
1115
1116 for (i = 0; i < nb_fd; i++) {
1117 /* Fetch once the poll data */
1118 revents = LTTNG_POLL_GETEV(&events, i);
1119 pollfd = LTTNG_POLL_GETFD(&events, i);
1120
1121 /* Thread quit pipe has been closed. Killing thread. */
1122 ret = check_thread_quit_pipe(pollfd, revents);
1123 if (ret) {
1124 goto error;
1125 }
1126
1127 /* Inspect the apps cmd pipe */
1128 if (pollfd == apps_cmd_pipe[0]) {
1129 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1130 ERR("Apps command pipe error");
1131 goto error;
1132 } else if (revents & LPOLLIN) {
1133 tracepoint(ust_register_read_start);
1134 /* Empty pipe */
1135 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1136 if (ret < 0 || ret < sizeof(ust_cmd)) {
1137 perror("read apps cmd pipe");
1138 goto error;
1139 }
1140 tracepoint(ust_register_read_stop);
1141
1142 tracepoint(ust_register_add_start);
1143 /* Register applicaton to the session daemon */
1144 ret = ust_app_register(&ust_cmd.reg_msg,
1145 ust_cmd.sock);
1146 if (ret == -ENOMEM) {
1147 goto error;
1148 } else if (ret < 0) {
1149 break;
1150 }
1151 tracepoint(ust_register_add_stop);
1152
1153 tracepoint(ust_register_done_start);
1154 /*
1155 * Validate UST version compatibility.
1156 */
1157 ret = ust_app_validate_version(ust_cmd.sock);
1158 if (ret >= 0) {
1159 /*
1160 * Add channel(s) and event(s) to newly registered apps
1161 * from lttng global UST domain.
1162 */
1163 update_ust_app(ust_cmd.sock);
1164 }
1165
1166 ret = ust_app_register_done(ust_cmd.sock);
1167 if (ret < 0) {
1168 /*
1169 * If the registration is not possible, we simply
1170 * unregister the apps and continue
1171 */
1172 ust_app_unregister(ust_cmd.sock);
1173 } else {
1174 /*
1175 * We just need here to monitor the close of the UST
1176 * socket and poll set monitor those by default.
1177 */
1178 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1179 if (ret < 0) {
1180 goto error;
1181 }
1182
1183 DBG("Apps with sock %d added to poll set",
1184 ust_cmd.sock);
1185 }
1186 tracepoint(ust_register_done_stop);
1187 break;
1188 }
1189 } else {
1190 /*
1191 * At this point, we know that a registered application made
1192 * the event at poll_wait.
1193 */
1194 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1195 tracepoint(ust_unregister_start);
1196
1197 /* Removing from the poll set */
1198 ret = lttng_poll_del(&events, pollfd);
1199 if (ret < 0) {
1200 goto error;
1201 }
1202
1203 /* Socket closed on remote end. */
1204 ust_app_unregister(pollfd);
1205
1206 tracepoint(ust_unregister_stop);
1207 break;
1208 }
1209 }
1210 }
1211 }
1212
1213 error:
1214 DBG("Application communication apps dying");
1215 close(apps_cmd_pipe[0]);
1216 close(apps_cmd_pipe[1]);
1217
1218 lttng_poll_clean(&events);
1219
1220 rcu_thread_offline();
1221 rcu_unregister_thread();
1222 return NULL;
1223 }
1224
1225 /*
1226 * Dispatch request from the registration threads to the application
1227 * communication thread.
1228 */
1229 static void *thread_dispatch_ust_registration(void *data)
1230 {
1231 int ret;
1232 struct cds_wfq_node *node;
1233 struct ust_command *ust_cmd = NULL;
1234
1235 tracepoint(sessiond_th_dispatch_start);
1236
1237 DBG("[thread] Dispatch UST command started");
1238
1239 while (!dispatch_thread_exit) {
1240 /* Atomically prepare the queue futex */
1241 futex_nto1_prepare(&ust_cmd_queue.futex);
1242
1243 do {
1244 tracepoint(sessiond_th_dispatch_block);
1245
1246 /* Dequeue command for registration */
1247 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1248 if (node == NULL) {
1249 DBG("Woken up but nothing in the UST command queue");
1250 /* Continue thread execution */
1251 break;
1252 }
1253
1254 tracepoint(ust_dispatch_register_start);
1255
1256 ust_cmd = caa_container_of(node, struct ust_command, node);
1257
1258 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1259 " gid:%d sock:%d name:%s (version %d.%d)",
1260 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1261 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1262 ust_cmd->sock, ust_cmd->reg_msg.name,
1263 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1264 /*
1265 * Inform apps thread of the new application registration. This
1266 * call is blocking so we can be assured that the data will be read
1267 * at some point in time or wait to the end of the world :)
1268 */
1269 ret = write(apps_cmd_pipe[1], ust_cmd,
1270 sizeof(struct ust_command));
1271 if (ret < 0) {
1272 perror("write apps cmd pipe");
1273 if (errno == EBADF) {
1274 /*
1275 * We can't inform the application thread to process
1276 * registration. We will exit or else application
1277 * registration will not occur and tracing will never
1278 * start.
1279 */
1280 goto error;
1281 }
1282 }
1283 free(ust_cmd);
1284 } while (node != NULL);
1285
1286 tracepoint(ust_dispatch_register_stop);
1287
1288 /* Futex wait on queue. Blocking call on futex() */
1289 futex_nto1_wait(&ust_cmd_queue.futex);
1290 }
1291
1292 error:
1293 DBG("Dispatch thread dying");
1294 return NULL;
1295 }
1296
1297 /*
1298 * This thread manage application registration.
1299 */
1300 static void *thread_registration_apps(void *data)
1301 {
1302 int sock = 0, i, ret, pollfd;
1303 uint32_t revents, nb_fd;
1304 struct lttng_poll_event events;
1305 /*
1306 * Get allocated in this thread, enqueued to a global queue, dequeued and
1307 * freed in the manage apps thread.
1308 */
1309 struct ust_command *ust_cmd = NULL;
1310
1311 tracepoint(sessiond_th_reg_start);
1312
1313 DBG("[thread] Manage application registration started");
1314
1315 ret = lttcomm_listen_unix_sock(apps_sock);
1316 if (ret < 0) {
1317 goto error;
1318 }
1319
1320 /*
1321 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1322 * more will be added to this poll set.
1323 */
1324 ret = create_thread_poll_set(&events, 2);
1325 if (ret < 0) {
1326 goto error;
1327 }
1328
1329 /* Add the application registration socket */
1330 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1331 if (ret < 0) {
1332 goto error;
1333 }
1334
1335 /* Notify all applications to register */
1336 ret = notify_ust_apps(1);
1337 if (ret < 0) {
1338 ERR("Failed to notify applications or create the wait shared memory.\n"
1339 "Execution continues but there might be problem for already\n"
1340 "running applications that wishes to register.");
1341 }
1342
1343 while (1) {
1344 DBG("Accepting application registration");
1345
1346 tracepoint(sessiond_th_reg_poll);
1347
1348 nb_fd = LTTNG_POLL_GETNB(&events);
1349
1350 /* Inifinite blocking call, waiting for transmission */
1351 ret = lttng_poll_wait(&events, -1);
1352 if (ret < 0) {
1353 goto error;
1354 }
1355
1356 for (i = 0; i < nb_fd; i++) {
1357 /* Fetch once the poll data */
1358 revents = LTTNG_POLL_GETEV(&events, i);
1359 pollfd = LTTNG_POLL_GETFD(&events, i);
1360
1361 /* Thread quit pipe has been closed. Killing thread. */
1362 ret = check_thread_quit_pipe(pollfd, revents);
1363 if (ret) {
1364 goto error;
1365 }
1366
1367 /* Event on the registration socket */
1368 if (pollfd == apps_sock) {
1369 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1370 ERR("Register apps socket poll error");
1371 goto error;
1372 } else if (revents & LPOLLIN) {
1373 /* Registration starts here. Recording cycles */
1374 tracepoint(ust_register_start);
1375
1376 sock = lttcomm_accept_unix_sock(apps_sock);
1377 if (sock < 0) {
1378 goto error;
1379 }
1380
1381 /* Create UST registration command for enqueuing */
1382 ust_cmd = zmalloc(sizeof(struct ust_command));
1383 if (ust_cmd == NULL) {
1384 perror("ust command zmalloc");
1385 goto error;
1386 }
1387
1388 /*
1389 * Using message-based transmissions to ensure we don't
1390 * have to deal with partially received messages.
1391 */
1392 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1393 sizeof(struct ust_register_msg));
1394 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1395 if (ret < 0) {
1396 perror("lttcomm_recv_unix_sock register apps");
1397 } else {
1398 ERR("Wrong size received on apps register");
1399 }
1400 free(ust_cmd);
1401 close(sock);
1402 continue;
1403 }
1404
1405 ust_cmd->sock = sock;
1406
1407 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1408 " gid:%d sock:%d name:%s (version %d.%d)",
1409 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1410 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1411 ust_cmd->sock, ust_cmd->reg_msg.name,
1412 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1413
1414 /*
1415 * Lock free enqueue the registration request. The red pill
1416 * has been taken! This apps will be part of the *system*.
1417 */
1418 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1419
1420 /*
1421 * Wake the registration queue futex. Implicit memory
1422 * barrier with the exchange in cds_wfq_enqueue.
1423 */
1424 futex_nto1_wake(&ust_cmd_queue.futex);
1425
1426 tracepoint(ust_register_stop);
1427 }
1428 }
1429 }
1430 }
1431
1432 error:
1433 DBG("UST Registration thread dying");
1434
1435 /* Notify that the registration thread is gone */
1436 notify_ust_apps(0);
1437
1438 close(apps_sock);
1439 close(sock);
1440 unlink(apps_unix_sock_path);
1441
1442 lttng_poll_clean(&events);
1443
1444 return NULL;
1445 }
1446
1447 /*
1448 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1449 * exec or it will fails.
1450 */
1451 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1452 {
1453 int ret;
1454 struct timespec timeout;
1455
1456 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1457 timeout.tv_nsec = 0;
1458
1459 /* Setup semaphore */
1460 ret = sem_init(&consumer_data->sem, 0, 0);
1461 if (ret < 0) {
1462 PERROR("sem_init consumer semaphore");
1463 goto error;
1464 }
1465
1466 ret = pthread_create(&consumer_data->thread, NULL,
1467 thread_manage_consumer, consumer_data);
1468 if (ret != 0) {
1469 PERROR("pthread_create consumer");
1470 ret = -1;
1471 goto error;
1472 }
1473
1474 /* Get time for sem_timedwait absolute timeout */
1475 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1476 if (ret < 0) {
1477 PERROR("clock_gettime spawn consumer");
1478 /* Infinite wait for the kconsumerd thread to be ready */
1479 ret = sem_wait(&consumer_data->sem);
1480 } else {
1481 /* Normal timeout if the gettime was successful */
1482 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1483 ret = sem_timedwait(&consumer_data->sem, &timeout);
1484 }
1485
1486 if (ret < 0) {
1487 if (errno == ETIMEDOUT) {
1488 /*
1489 * Call has timed out so we kill the kconsumerd_thread and return
1490 * an error.
1491 */
1492 ERR("The consumer thread was never ready. Killing it");
1493 ret = pthread_cancel(consumer_data->thread);
1494 if (ret < 0) {
1495 PERROR("pthread_cancel consumer thread");
1496 }
1497 } else {
1498 PERROR("semaphore wait failed consumer thread");
1499 }
1500 goto error;
1501 }
1502
1503 pthread_mutex_lock(&consumer_data->pid_mutex);
1504 if (consumer_data->pid == 0) {
1505 ERR("Kconsumerd did not start");
1506 pthread_mutex_unlock(&consumer_data->pid_mutex);
1507 goto error;
1508 }
1509 pthread_mutex_unlock(&consumer_data->pid_mutex);
1510
1511 return 0;
1512
1513 error:
1514 return ret;
1515 }
1516
1517 /*
1518 * Join consumer thread
1519 */
1520 static int join_consumer_thread(struct consumer_data *consumer_data)
1521 {
1522 void *status;
1523 int ret;
1524
1525 if (consumer_data->pid != 0) {
1526 ret = kill(consumer_data->pid, SIGTERM);
1527 if (ret) {
1528 ERR("Error killing consumer daemon");
1529 return ret;
1530 }
1531 return pthread_join(consumer_data->thread, &status);
1532 } else {
1533 return 0;
1534 }
1535 }
1536
1537 /*
1538 * Fork and exec a consumer daemon (consumerd).
1539 *
1540 * Return pid if successful else -1.
1541 */
1542 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1543 {
1544 int ret;
1545 pid_t pid;
1546 const char *consumer_to_use;
1547 const char *verbosity;
1548 struct stat st;
1549
1550 DBG("Spawning consumerd");
1551
1552 pid = fork();
1553 if (pid == 0) {
1554 /*
1555 * Exec consumerd.
1556 */
1557 if (opt_verbose_consumer) {
1558 verbosity = "--verbose";
1559 } else {
1560 verbosity = "--quiet";
1561 }
1562 switch (consumer_data->type) {
1563 case LTTNG_CONSUMER_KERNEL:
1564 /*
1565 * Find out which consumerd to execute. We will first try the
1566 * 64-bit path, then the sessiond's installation directory, and
1567 * fallback on the 32-bit one,
1568 */
1569 DBG3("Looking for a kernel consumer at these locations:");
1570 DBG3(" 1) %s", consumerd64_bin);
1571 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1572 DBG3(" 3) %s", consumerd32_bin);
1573 if (stat(consumerd64_bin, &st) == 0) {
1574 DBG3("Found location #1");
1575 consumer_to_use = consumerd64_bin;
1576 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1577 DBG3("Found location #2");
1578 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1579 } else if (stat(consumerd32_bin, &st) == 0) {
1580 DBG3("Found location #3");
1581 consumer_to_use = consumerd32_bin;
1582 } else {
1583 DBG("Could not find any valid consumerd executable");
1584 break;
1585 }
1586 DBG("Using kernel consumer at: %s", consumer_to_use);
1587 execl(consumer_to_use,
1588 "lttng-consumerd", verbosity, "-k",
1589 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1590 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1591 NULL);
1592 break;
1593 case LTTNG_CONSUMER64_UST:
1594 {
1595 char *tmpnew = NULL;
1596
1597 if (consumerd64_libdir[0] != '\0') {
1598 char *tmp;
1599 size_t tmplen;
1600
1601 tmp = getenv("LD_LIBRARY_PATH");
1602 if (!tmp) {
1603 tmp = "";
1604 }
1605 tmplen = strlen("LD_LIBRARY_PATH=")
1606 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1607 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1608 if (!tmpnew) {
1609 ret = -ENOMEM;
1610 goto error;
1611 }
1612 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1613 strcat(tmpnew, consumerd64_libdir);
1614 if (tmp[0] != '\0') {
1615 strcat(tmpnew, ":");
1616 strcat(tmpnew, tmp);
1617 }
1618 ret = putenv(tmpnew);
1619 if (ret) {
1620 ret = -errno;
1621 goto error;
1622 }
1623 }
1624 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1625 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1626 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1627 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1628 NULL);
1629 if (consumerd64_libdir[0] != '\0') {
1630 free(tmpnew);
1631 }
1632 if (ret) {
1633 goto error;
1634 }
1635 break;
1636 }
1637 case LTTNG_CONSUMER32_UST:
1638 {
1639 char *tmpnew = NULL;
1640
1641 if (consumerd32_libdir[0] != '\0') {
1642 char *tmp;
1643 size_t tmplen;
1644
1645 tmp = getenv("LD_LIBRARY_PATH");
1646 if (!tmp) {
1647 tmp = "";
1648 }
1649 tmplen = strlen("LD_LIBRARY_PATH=")
1650 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1651 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1652 if (!tmpnew) {
1653 ret = -ENOMEM;
1654 goto error;
1655 }
1656 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1657 strcat(tmpnew, consumerd32_libdir);
1658 if (tmp[0] != '\0') {
1659 strcat(tmpnew, ":");
1660 strcat(tmpnew, tmp);
1661 }
1662 ret = putenv(tmpnew);
1663 if (ret) {
1664 ret = -errno;
1665 goto error;
1666 }
1667 }
1668 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1669 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1670 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1671 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1672 NULL);
1673 if (consumerd32_libdir[0] != '\0') {
1674 free(tmpnew);
1675 }
1676 if (ret) {
1677 goto error;
1678 }
1679 break;
1680 }
1681 default:
1682 perror("unknown consumer type");
1683 exit(EXIT_FAILURE);
1684 }
1685 if (errno != 0) {
1686 perror("kernel start consumer exec");
1687 }
1688 exit(EXIT_FAILURE);
1689 } else if (pid > 0) {
1690 ret = pid;
1691 } else {
1692 perror("start consumer fork");
1693 ret = -errno;
1694 }
1695 error:
1696 return ret;
1697 }
1698
1699 /*
1700 * Spawn the consumerd daemon and session daemon thread.
1701 */
1702 static int start_consumerd(struct consumer_data *consumer_data)
1703 {
1704 int ret;
1705
1706 pthread_mutex_lock(&consumer_data->pid_mutex);
1707 if (consumer_data->pid != 0) {
1708 pthread_mutex_unlock(&consumer_data->pid_mutex);
1709 goto end;
1710 }
1711
1712 ret = spawn_consumerd(consumer_data);
1713 if (ret < 0) {
1714 ERR("Spawning consumerd failed");
1715 pthread_mutex_unlock(&consumer_data->pid_mutex);
1716 goto error;
1717 }
1718
1719 /* Setting up the consumer_data pid */
1720 consumer_data->pid = ret;
1721 DBG2("Consumer pid %d", consumer_data->pid);
1722 pthread_mutex_unlock(&consumer_data->pid_mutex);
1723
1724 DBG2("Spawning consumer control thread");
1725 ret = spawn_consumer_thread(consumer_data);
1726 if (ret < 0) {
1727 ERR("Fatal error spawning consumer control thread");
1728 goto error;
1729 }
1730
1731 end:
1732 return 0;
1733
1734 error:
1735 return ret;
1736 }
1737
1738 /*
1739 * Check version of the lttng-modules.
1740 */
1741 static int validate_lttng_modules_version(void)
1742 {
1743 return kernel_validate_version(kernel_tracer_fd);
1744 }
1745
1746 /*
1747 * Setup necessary data for kernel tracer action.
1748 */
1749 static int init_kernel_tracer(void)
1750 {
1751 int ret;
1752
1753 /* Modprobe lttng kernel modules */
1754 ret = modprobe_lttng_control();
1755 if (ret < 0) {
1756 goto error;
1757 }
1758
1759 /* Open debugfs lttng */
1760 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1761 if (kernel_tracer_fd < 0) {
1762 DBG("Failed to open %s", module_proc_lttng);
1763 ret = -1;
1764 goto error_open;
1765 }
1766
1767 /* Validate kernel version */
1768 ret = validate_lttng_modules_version();
1769 if (ret < 0) {
1770 goto error_version;
1771 }
1772
1773 ret = modprobe_lttng_data();
1774 if (ret < 0) {
1775 goto error_modules;
1776 }
1777
1778 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1779 return 0;
1780
1781 error_version:
1782 modprobe_remove_lttng_control();
1783 close(kernel_tracer_fd);
1784 kernel_tracer_fd = 0;
1785 return LTTCOMM_KERN_VERSION;
1786
1787 error_modules:
1788 close(kernel_tracer_fd);
1789
1790 error_open:
1791 modprobe_remove_lttng_control();
1792
1793 error:
1794 WARN("No kernel tracer available");
1795 kernel_tracer_fd = 0;
1796 return LTTCOMM_KERN_NA;
1797 }
1798
1799 /*
1800 * Init tracing by creating trace directory and sending fds kernel consumer.
1801 */
1802 static int init_kernel_tracing(struct ltt_kernel_session *session)
1803 {
1804 int ret = 0;
1805
1806 if (session->consumer_fds_sent == 0) {
1807 /*
1808 * Assign default kernel consumer socket if no consumer assigned to the
1809 * kernel session. At this point, it's NOT suppose to be 0 but this is
1810 * an extra security check.
1811 */
1812 if (session->consumer_fd == 0) {
1813 session->consumer_fd = kconsumer_data.cmd_sock;
1814 }
1815
1816 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1817 if (ret < 0) {
1818 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1819 goto error;
1820 }
1821
1822 session->consumer_fds_sent = 1;
1823 }
1824
1825 error:
1826 return ret;
1827 }
1828
1829 /*
1830 * Create an UST session and add it to the session ust list.
1831 */
1832 static int create_ust_session(struct ltt_session *session,
1833 struct lttng_domain *domain)
1834 {
1835 struct ltt_ust_session *lus = NULL;
1836 int ret;
1837
1838 switch (domain->type) {
1839 case LTTNG_DOMAIN_UST:
1840 break;
1841 default:
1842 ret = LTTCOMM_UNKNOWN_DOMAIN;
1843 goto error;
1844 }
1845
1846 DBG("Creating UST session");
1847
1848 lus = trace_ust_create_session(session->path, session->id, domain);
1849 if (lus == NULL) {
1850 ret = LTTCOMM_UST_SESS_FAIL;
1851 goto error;
1852 }
1853
1854 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1855 session->uid, session->gid);
1856 if (ret < 0) {
1857 if (ret != -EEXIST) {
1858 ERR("Trace directory creation error");
1859 ret = LTTCOMM_UST_SESS_FAIL;
1860 goto error;
1861 }
1862 }
1863
1864 /* The domain type dictate different actions on session creation */
1865 switch (domain->type) {
1866 case LTTNG_DOMAIN_UST:
1867 /* No ustctl for the global UST domain */
1868 break;
1869 default:
1870 ERR("Unknown UST domain on create session %d", domain->type);
1871 goto error;
1872 }
1873 lus->uid = session->uid;
1874 lus->gid = session->gid;
1875 session->ust_session = lus;
1876
1877 return LTTCOMM_OK;
1878
1879 error:
1880 free(lus);
1881 return ret;
1882 }
1883
1884 /*
1885 * Create a kernel tracer session then create the default channel.
1886 */
1887 static int create_kernel_session(struct ltt_session *session)
1888 {
1889 int ret;
1890
1891 DBG("Creating kernel session");
1892
1893 ret = kernel_create_session(session, kernel_tracer_fd);
1894 if (ret < 0) {
1895 ret = LTTCOMM_KERN_SESS_FAIL;
1896 goto error;
1897 }
1898
1899 /* Set kernel consumer socket fd */
1900 if (kconsumer_data.cmd_sock) {
1901 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1902 }
1903
1904 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1905 S_IRWXU | S_IRWXG, session->uid, session->gid);
1906 if (ret < 0) {
1907 if (ret != -EEXIST) {
1908 ERR("Trace directory creation error");
1909 goto error;
1910 }
1911 }
1912 session->kernel_session->uid = session->uid;
1913 session->kernel_session->gid = session->gid;
1914
1915 error:
1916 return ret;
1917 }
1918
1919 /*
1920 * Check if the UID or GID match the session. Root user has access to all
1921 * sessions.
1922 */
1923 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1924 {
1925 if (uid != session->uid && gid != session->gid && uid != 0) {
1926 return 0;
1927 } else {
1928 return 1;
1929 }
1930 }
1931
1932 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1933 {
1934 unsigned int i = 0;
1935 struct ltt_session *session;
1936
1937 DBG("Counting number of available session for UID %d GID %d",
1938 uid, gid);
1939 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1940 /*
1941 * Only list the sessions the user can control.
1942 */
1943 if (!session_access_ok(session, uid, gid)) {
1944 continue;
1945 }
1946 i++;
1947 }
1948 return i;
1949 }
1950
1951 /*
1952 * Using the session list, filled a lttng_session array to send back to the
1953 * client for session listing.
1954 *
1955 * The session list lock MUST be acquired before calling this function. Use
1956 * session_lock_list() and session_unlock_list().
1957 */
1958 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1959 gid_t gid)
1960 {
1961 unsigned int i = 0;
1962 struct ltt_session *session;
1963
1964 DBG("Getting all available session for UID %d GID %d",
1965 uid, gid);
1966 /*
1967 * Iterate over session list and append data after the control struct in
1968 * the buffer.
1969 */
1970 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1971 /*
1972 * Only list the sessions the user can control.
1973 */
1974 if (!session_access_ok(session, uid, gid)) {
1975 continue;
1976 }
1977 strncpy(sessions[i].path, session->path, PATH_MAX);
1978 sessions[i].path[PATH_MAX - 1] = '\0';
1979 strncpy(sessions[i].name, session->name, NAME_MAX);
1980 sessions[i].name[NAME_MAX - 1] = '\0';
1981 sessions[i].enabled = session->enabled;
1982 i++;
1983 }
1984 }
1985
1986 /*
1987 * Fill lttng_channel array of all channels.
1988 */
1989 static void list_lttng_channels(int domain, struct ltt_session *session,
1990 struct lttng_channel *channels)
1991 {
1992 int i = 0;
1993 struct ltt_kernel_channel *kchan;
1994
1995 DBG("Listing channels for session %s", session->name);
1996
1997 switch (domain) {
1998 case LTTNG_DOMAIN_KERNEL:
1999 /* Kernel channels */
2000 if (session->kernel_session != NULL) {
2001 cds_list_for_each_entry(kchan,
2002 &session->kernel_session->channel_list.head, list) {
2003 /* Copy lttng_channel struct to array */
2004 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2005 channels[i].enabled = kchan->enabled;
2006 i++;
2007 }
2008 }
2009 break;
2010 case LTTNG_DOMAIN_UST:
2011 {
2012 struct lttng_ht_iter iter;
2013 struct ltt_ust_channel *uchan;
2014
2015 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2016 &iter.iter, uchan, node.node) {
2017 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2018 channels[i].attr.overwrite = uchan->attr.overwrite;
2019 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2020 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2021 channels[i].attr.switch_timer_interval =
2022 uchan->attr.switch_timer_interval;
2023 channels[i].attr.read_timer_interval =
2024 uchan->attr.read_timer_interval;
2025 channels[i].enabled = uchan->enabled;
2026 switch (uchan->attr.output) {
2027 case LTTNG_UST_MMAP:
2028 default:
2029 channels[i].attr.output = LTTNG_EVENT_MMAP;
2030 break;
2031 }
2032 i++;
2033 }
2034 break;
2035 }
2036 default:
2037 break;
2038 }
2039 }
2040
2041 /*
2042 * Create a list of ust global domain events.
2043 */
2044 static int list_lttng_ust_global_events(char *channel_name,
2045 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2046 {
2047 int i = 0, ret = 0;
2048 unsigned int nb_event = 0;
2049 struct lttng_ht_iter iter;
2050 struct lttng_ht_node_str *node;
2051 struct ltt_ust_channel *uchan;
2052 struct ltt_ust_event *uevent;
2053 struct lttng_event *tmp;
2054
2055 DBG("Listing UST global events for channel %s", channel_name);
2056
2057 rcu_read_lock();
2058
2059 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2060 node = lttng_ht_iter_get_node_str(&iter);
2061 if (node == NULL) {
2062 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2063 goto error;
2064 }
2065
2066 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2067
2068 nb_event += lttng_ht_get_count(uchan->events);
2069
2070 if (nb_event == 0) {
2071 ret = nb_event;
2072 goto error;
2073 }
2074
2075 DBG3("Listing UST global %d events", nb_event);
2076
2077 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2078 if (tmp == NULL) {
2079 ret = -LTTCOMM_FATAL;
2080 goto error;
2081 }
2082
2083 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2084 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2085 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2086 tmp[i].enabled = uevent->enabled;
2087 switch (uevent->attr.instrumentation) {
2088 case LTTNG_UST_TRACEPOINT:
2089 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2090 break;
2091 case LTTNG_UST_PROBE:
2092 tmp[i].type = LTTNG_EVENT_PROBE;
2093 break;
2094 case LTTNG_UST_FUNCTION:
2095 tmp[i].type = LTTNG_EVENT_FUNCTION;
2096 break;
2097 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2098 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2099 break;
2100 }
2101 i++;
2102 }
2103
2104 ret = nb_event;
2105 *events = tmp;
2106
2107 error:
2108 rcu_read_unlock();
2109 return ret;
2110 }
2111
2112 /*
2113 * Fill lttng_event array of all kernel events in the channel.
2114 */
2115 static int list_lttng_kernel_events(char *channel_name,
2116 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2117 {
2118 int i = 0, ret;
2119 unsigned int nb_event;
2120 struct ltt_kernel_event *event;
2121 struct ltt_kernel_channel *kchan;
2122
2123 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2124 if (kchan == NULL) {
2125 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2126 goto error;
2127 }
2128
2129 nb_event = kchan->event_count;
2130
2131 DBG("Listing events for channel %s", kchan->channel->name);
2132
2133 if (nb_event == 0) {
2134 ret = nb_event;
2135 goto error;
2136 }
2137
2138 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2139 if (*events == NULL) {
2140 ret = LTTCOMM_FATAL;
2141 goto error;
2142 }
2143
2144 /* Kernel channels */
2145 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2146 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2147 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2148 (*events)[i].enabled = event->enabled;
2149 switch (event->event->instrumentation) {
2150 case LTTNG_KERNEL_TRACEPOINT:
2151 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2152 break;
2153 case LTTNG_KERNEL_KPROBE:
2154 case LTTNG_KERNEL_KRETPROBE:
2155 (*events)[i].type = LTTNG_EVENT_PROBE;
2156 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2157 sizeof(struct lttng_kernel_kprobe));
2158 break;
2159 case LTTNG_KERNEL_FUNCTION:
2160 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2161 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2162 sizeof(struct lttng_kernel_function));
2163 break;
2164 case LTTNG_KERNEL_NOOP:
2165 (*events)[i].type = LTTNG_EVENT_NOOP;
2166 break;
2167 case LTTNG_KERNEL_SYSCALL:
2168 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2169 break;
2170 case LTTNG_KERNEL_ALL:
2171 assert(0);
2172 break;
2173 }
2174 i++;
2175 }
2176
2177 return nb_event;
2178
2179 error:
2180 return ret;
2181 }
2182
2183 /*
2184 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2185 */
2186 static int cmd_disable_channel(struct ltt_session *session,
2187 int domain, char *channel_name)
2188 {
2189 int ret;
2190 struct ltt_ust_session *usess;
2191
2192 usess = session->ust_session;
2193
2194 switch (domain) {
2195 case LTTNG_DOMAIN_KERNEL:
2196 {
2197 ret = channel_kernel_disable(session->kernel_session,
2198 channel_name);
2199 if (ret != LTTCOMM_OK) {
2200 goto error;
2201 }
2202
2203 kernel_wait_quiescent(kernel_tracer_fd);
2204 break;
2205 }
2206 case LTTNG_DOMAIN_UST:
2207 {
2208 struct ltt_ust_channel *uchan;
2209 struct lttng_ht *chan_ht;
2210
2211 chan_ht = usess->domain_global.channels;
2212
2213 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2214 if (uchan == NULL) {
2215 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2216 goto error;
2217 }
2218
2219 ret = channel_ust_disable(usess, domain, uchan);
2220 if (ret != LTTCOMM_OK) {
2221 goto error;
2222 }
2223 break;
2224 }
2225 #if 0
2226 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2227 case LTTNG_DOMAIN_UST_EXEC_NAME:
2228 case LTTNG_DOMAIN_UST_PID:
2229 #endif
2230 default:
2231 ret = LTTCOMM_UNKNOWN_DOMAIN;
2232 goto error;
2233 }
2234
2235 ret = LTTCOMM_OK;
2236
2237 error:
2238 return ret;
2239 }
2240
2241 /*
2242 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2243 */
2244 static int cmd_enable_channel(struct ltt_session *session,
2245 int domain, struct lttng_channel *attr)
2246 {
2247 int ret;
2248 struct ltt_ust_session *usess = session->ust_session;
2249 struct lttng_ht *chan_ht;
2250
2251 DBG("Enabling channel %s for session %s", attr->name, session->name);
2252
2253 switch (domain) {
2254 case LTTNG_DOMAIN_KERNEL:
2255 {
2256 struct ltt_kernel_channel *kchan;
2257
2258 kchan = trace_kernel_get_channel_by_name(attr->name,
2259 session->kernel_session);
2260 if (kchan == NULL) {
2261 ret = channel_kernel_create(session->kernel_session,
2262 attr, kernel_poll_pipe[1]);
2263 } else {
2264 ret = channel_kernel_enable(session->kernel_session, kchan);
2265 }
2266
2267 if (ret != LTTCOMM_OK) {
2268 goto error;
2269 }
2270
2271 kernel_wait_quiescent(kernel_tracer_fd);
2272 break;
2273 }
2274 case LTTNG_DOMAIN_UST:
2275 {
2276 struct ltt_ust_channel *uchan;
2277
2278 chan_ht = usess->domain_global.channels;
2279
2280 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2281 if (uchan == NULL) {
2282 ret = channel_ust_create(usess, domain, attr);
2283 } else {
2284 ret = channel_ust_enable(usess, domain, uchan);
2285 }
2286 break;
2287 }
2288 #if 0
2289 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2290 case LTTNG_DOMAIN_UST_EXEC_NAME:
2291 case LTTNG_DOMAIN_UST_PID:
2292 #endif
2293 default:
2294 ret = LTTCOMM_UNKNOWN_DOMAIN;
2295 goto error;
2296 }
2297
2298 error:
2299 return ret;
2300 }
2301
2302 /*
2303 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2304 */
2305 static int cmd_disable_event(struct ltt_session *session, int domain,
2306 char *channel_name, char *event_name)
2307 {
2308 int ret;
2309
2310 switch (domain) {
2311 case LTTNG_DOMAIN_KERNEL:
2312 {
2313 struct ltt_kernel_channel *kchan;
2314 struct ltt_kernel_session *ksess;
2315
2316 ksess = session->kernel_session;
2317
2318 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2319 if (kchan == NULL) {
2320 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2321 goto error;
2322 }
2323
2324 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2325 if (ret != LTTCOMM_OK) {
2326 goto error;
2327 }
2328
2329 kernel_wait_quiescent(kernel_tracer_fd);
2330 break;
2331 }
2332 case LTTNG_DOMAIN_UST:
2333 {
2334 struct ltt_ust_channel *uchan;
2335 struct ltt_ust_session *usess;
2336
2337 usess = session->ust_session;
2338
2339 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2340 channel_name);
2341 if (uchan == NULL) {
2342 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2343 goto error;
2344 }
2345
2346 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2347 if (ret != LTTCOMM_OK) {
2348 goto error;
2349 }
2350
2351 DBG3("Disable UST event %s in channel %s completed", event_name,
2352 channel_name);
2353 break;
2354 }
2355 #if 0
2356 case LTTNG_DOMAIN_UST_EXEC_NAME:
2357 case LTTNG_DOMAIN_UST_PID:
2358 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2359 #endif
2360 default:
2361 ret = LTTCOMM_UND;
2362 goto error;
2363 }
2364
2365 ret = LTTCOMM_OK;
2366
2367 error:
2368 return ret;
2369 }
2370
2371 /*
2372 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2373 */
2374 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2375 char *channel_name)
2376 {
2377 int ret;
2378
2379 switch (domain) {
2380 case LTTNG_DOMAIN_KERNEL:
2381 {
2382 struct ltt_kernel_session *ksess;
2383 struct ltt_kernel_channel *kchan;
2384
2385 ksess = session->kernel_session;
2386
2387 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2388 if (kchan == NULL) {
2389 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2390 goto error;
2391 }
2392
2393 ret = event_kernel_disable_all(ksess, kchan);
2394 if (ret != LTTCOMM_OK) {
2395 goto error;
2396 }
2397
2398 kernel_wait_quiescent(kernel_tracer_fd);
2399 break;
2400 }
2401 case LTTNG_DOMAIN_UST:
2402 {
2403 struct ltt_ust_session *usess;
2404 struct ltt_ust_channel *uchan;
2405
2406 usess = session->ust_session;
2407
2408 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2409 channel_name);
2410 if (uchan == NULL) {
2411 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2412 goto error;
2413 }
2414
2415 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2416 if (ret != 0) {
2417 goto error;
2418 }
2419
2420 DBG3("Disable all UST events in channel %s completed", channel_name);
2421
2422 break;
2423 }
2424 #if 0
2425 case LTTNG_DOMAIN_UST_EXEC_NAME:
2426 case LTTNG_DOMAIN_UST_PID:
2427 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2428 #endif
2429 default:
2430 ret = LTTCOMM_UND;
2431 goto error;
2432 }
2433
2434 ret = LTTCOMM_OK;
2435
2436 error:
2437 return ret;
2438 }
2439
2440 /*
2441 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2442 */
2443 static int cmd_add_context(struct ltt_session *session, int domain,
2444 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2445 {
2446 int ret;
2447
2448 switch (domain) {
2449 case LTTNG_DOMAIN_KERNEL:
2450 /* Add kernel context to kernel tracer */
2451 ret = context_kernel_add(session->kernel_session, ctx,
2452 event_name, channel_name);
2453 if (ret != LTTCOMM_OK) {
2454 goto error;
2455 }
2456 break;
2457 case LTTNG_DOMAIN_UST:
2458 {
2459 struct ltt_ust_session *usess = session->ust_session;
2460
2461 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2462 if (ret != LTTCOMM_OK) {
2463 goto error;
2464 }
2465 break;
2466 }
2467 #if 0
2468 case LTTNG_DOMAIN_UST_EXEC_NAME:
2469 case LTTNG_DOMAIN_UST_PID:
2470 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2471 #endif
2472 default:
2473 ret = LTTCOMM_UND;
2474 goto error;
2475 }
2476
2477 ret = LTTCOMM_OK;
2478
2479 error:
2480 return ret;
2481 }
2482
2483 /*
2484 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2485 *
2486 * TODO: currently, both events and loglevels are kept within the same
2487 * namespace for UST global registry/app registery, so if an event
2488 * happen to have the same name as the loglevel (very unlikely though),
2489 * and an attempt is made to enable/disable both in the same session,
2490 * the first to be created will be the only one allowed to exist.
2491 */
2492 static int cmd_enable_event(struct ltt_session *session, int domain,
2493 char *channel_name, struct lttng_event *event)
2494 {
2495 int ret;
2496 struct lttng_channel *attr;
2497 struct ltt_ust_session *usess = session->ust_session;
2498
2499 switch (domain) {
2500 case LTTNG_DOMAIN_KERNEL:
2501 {
2502 struct ltt_kernel_channel *kchan;
2503
2504 kchan = trace_kernel_get_channel_by_name(channel_name,
2505 session->kernel_session);
2506 if (kchan == NULL) {
2507 attr = channel_new_default_attr(domain);
2508 if (attr == NULL) {
2509 ret = LTTCOMM_FATAL;
2510 goto error;
2511 }
2512 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2513
2514 /* This call will notify the kernel thread */
2515 ret = channel_kernel_create(session->kernel_session,
2516 attr, kernel_poll_pipe[1]);
2517 if (ret != LTTCOMM_OK) {
2518 free(attr);
2519 goto error;
2520 }
2521 free(attr);
2522 }
2523
2524 /* Get the newly created kernel channel pointer */
2525 kchan = trace_kernel_get_channel_by_name(channel_name,
2526 session->kernel_session);
2527 if (kchan == NULL) {
2528 /* This sould not happen... */
2529 ret = LTTCOMM_FATAL;
2530 goto error;
2531 }
2532
2533 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2534 event);
2535 if (ret != LTTCOMM_OK) {
2536 goto error;
2537 }
2538
2539 kernel_wait_quiescent(kernel_tracer_fd);
2540 break;
2541 }
2542 case LTTNG_DOMAIN_UST:
2543 {
2544 struct lttng_channel *attr;
2545 struct ltt_ust_channel *uchan;
2546
2547 /* Get channel from global UST domain */
2548 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2549 channel_name);
2550 if (uchan == NULL) {
2551 /* Create default channel */
2552 attr = channel_new_default_attr(domain);
2553 if (attr == NULL) {
2554 ret = LTTCOMM_FATAL;
2555 goto error;
2556 }
2557 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2558 attr->name[NAME_MAX - 1] = '\0';
2559
2560 ret = channel_ust_create(usess, domain, attr);
2561 if (ret != LTTCOMM_OK) {
2562 free(attr);
2563 goto error;
2564 }
2565 free(attr);
2566
2567 /* Get the newly created channel reference back */
2568 uchan = trace_ust_find_channel_by_name(
2569 usess->domain_global.channels, channel_name);
2570 if (uchan == NULL) {
2571 /* Something is really wrong */
2572 ret = LTTCOMM_FATAL;
2573 goto error;
2574 }
2575 }
2576
2577 /* At this point, the session and channel exist on the tracer */
2578 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2579 if (ret != LTTCOMM_OK) {
2580 goto error;
2581 }
2582 break;
2583 }
2584 #if 0
2585 case LTTNG_DOMAIN_UST_EXEC_NAME:
2586 case LTTNG_DOMAIN_UST_PID:
2587 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2588 #endif
2589 default:
2590 ret = LTTCOMM_UND;
2591 goto error;
2592 }
2593
2594 ret = LTTCOMM_OK;
2595
2596 error:
2597 return ret;
2598 }
2599
2600 /*
2601 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2602 */
2603 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2604 char *channel_name, int event_type)
2605 {
2606 int ret;
2607 struct ltt_kernel_channel *kchan;
2608
2609 switch (domain) {
2610 case LTTNG_DOMAIN_KERNEL:
2611 kchan = trace_kernel_get_channel_by_name(channel_name,
2612 session->kernel_session);
2613 if (kchan == NULL) {
2614 /* This call will notify the kernel thread */
2615 ret = channel_kernel_create(session->kernel_session, NULL,
2616 kernel_poll_pipe[1]);
2617 if (ret != LTTCOMM_OK) {
2618 goto error;
2619 }
2620
2621 /* Get the newly created kernel channel pointer */
2622 kchan = trace_kernel_get_channel_by_name(channel_name,
2623 session->kernel_session);
2624 if (kchan == NULL) {
2625 /* This sould not happen... */
2626 ret = LTTCOMM_FATAL;
2627 goto error;
2628 }
2629
2630 }
2631
2632 switch (event_type) {
2633 case LTTNG_EVENT_SYSCALL:
2634 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2635 kchan, kernel_tracer_fd);
2636 break;
2637 case LTTNG_EVENT_TRACEPOINT:
2638 /*
2639 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2640 * events already registered to the channel.
2641 */
2642 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2643 kchan, kernel_tracer_fd);
2644 break;
2645 case LTTNG_EVENT_ALL:
2646 /* Enable syscalls and tracepoints */
2647 ret = event_kernel_enable_all(session->kernel_session,
2648 kchan, kernel_tracer_fd);
2649 break;
2650 default:
2651 ret = LTTCOMM_KERN_ENABLE_FAIL;
2652 goto error;
2653 }
2654
2655 /* Manage return value */
2656 if (ret != LTTCOMM_OK) {
2657 goto error;
2658 }
2659
2660 kernel_wait_quiescent(kernel_tracer_fd);
2661 break;
2662 case LTTNG_DOMAIN_UST:
2663 {
2664 struct lttng_channel *attr;
2665 struct ltt_ust_channel *uchan;
2666 struct ltt_ust_session *usess = session->ust_session;
2667
2668 /* Get channel from global UST domain */
2669 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2670 channel_name);
2671 if (uchan == NULL) {
2672 /* Create default channel */
2673 attr = channel_new_default_attr(domain);
2674 if (attr == NULL) {
2675 ret = LTTCOMM_FATAL;
2676 goto error;
2677 }
2678 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2679 attr->name[NAME_MAX - 1] = '\0';
2680
2681 /* Use the internal command enable channel */
2682 ret = channel_ust_create(usess, domain, attr);
2683 if (ret != LTTCOMM_OK) {
2684 free(attr);
2685 goto error;
2686 }
2687 free(attr);
2688
2689 /* Get the newly created channel reference back */
2690 uchan = trace_ust_find_channel_by_name(
2691 usess->domain_global.channels, channel_name);
2692 if (uchan == NULL) {
2693 /* Something is really wrong */
2694 ret = LTTCOMM_FATAL;
2695 goto error;
2696 }
2697 }
2698
2699 /* At this point, the session and channel exist on the tracer */
2700
2701 switch (event_type) {
2702 case LTTNG_EVENT_ALL:
2703 case LTTNG_EVENT_TRACEPOINT:
2704 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2705 if (ret != LTTCOMM_OK) {
2706 goto error;
2707 }
2708 break;
2709 default:
2710 ret = LTTCOMM_UST_ENABLE_FAIL;
2711 goto error;
2712 }
2713
2714 /* Manage return value */
2715 if (ret != LTTCOMM_OK) {
2716 goto error;
2717 }
2718
2719 break;
2720 }
2721 #if 0
2722 case LTTNG_DOMAIN_UST_EXEC_NAME:
2723 case LTTNG_DOMAIN_UST_PID:
2724 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2725 #endif
2726 default:
2727 ret = LTTCOMM_UND;
2728 goto error;
2729 }
2730
2731 ret = LTTCOMM_OK;
2732
2733 error:
2734 return ret;
2735 }
2736
2737 /*
2738 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2739 */
2740 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2741 {
2742 int ret;
2743 ssize_t nb_events = 0;
2744
2745 switch (domain) {
2746 case LTTNG_DOMAIN_KERNEL:
2747 nb_events = kernel_list_events(kernel_tracer_fd, events);
2748 if (nb_events < 0) {
2749 ret = LTTCOMM_KERN_LIST_FAIL;
2750 goto error;
2751 }
2752 break;
2753 case LTTNG_DOMAIN_UST:
2754 nb_events = ust_app_list_events(events);
2755 if (nb_events < 0) {
2756 ret = LTTCOMM_UST_LIST_FAIL;
2757 goto error;
2758 }
2759 break;
2760 default:
2761 ret = LTTCOMM_UND;
2762 goto error;
2763 }
2764
2765 return nb_events;
2766
2767 error:
2768 /* Return negative value to differentiate return code */
2769 return -ret;
2770 }
2771
2772 /*
2773 * Command LTTNG_START_TRACE processed by the client thread.
2774 */
2775 static int cmd_start_trace(struct ltt_session *session)
2776 {
2777 int ret;
2778 struct ltt_kernel_session *ksession;
2779 struct ltt_ust_session *usess;
2780
2781 /* Short cut */
2782 ksession = session->kernel_session;
2783 usess = session->ust_session;
2784
2785 if (session->enabled) {
2786 ret = LTTCOMM_UST_START_FAIL;
2787 goto error;
2788 }
2789
2790 session->enabled = 1;
2791
2792 /* Kernel tracing */
2793 if (ksession != NULL) {
2794 struct ltt_kernel_channel *kchan;
2795
2796 /* Open kernel metadata */
2797 if (ksession->metadata == NULL) {
2798 ret = kernel_open_metadata(ksession, ksession->trace_path);
2799 if (ret < 0) {
2800 ret = LTTCOMM_KERN_META_FAIL;
2801 goto error;
2802 }
2803 }
2804
2805 /* Open kernel metadata stream */
2806 if (ksession->metadata_stream_fd == 0) {
2807 ret = kernel_open_metadata_stream(ksession);
2808 if (ret < 0) {
2809 ERR("Kernel create metadata stream failed");
2810 ret = LTTCOMM_KERN_STREAM_FAIL;
2811 goto error;
2812 }
2813 }
2814
2815 /* For each channel */
2816 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2817 if (kchan->stream_count == 0) {
2818 ret = kernel_open_channel_stream(kchan);
2819 if (ret < 0) {
2820 ret = LTTCOMM_KERN_STREAM_FAIL;
2821 goto error;
2822 }
2823 /* Update the stream global counter */
2824 ksession->stream_count_global += ret;
2825 }
2826 }
2827
2828 /* Setup kernel consumer socket and send fds to it */
2829 ret = init_kernel_tracing(ksession);
2830 if (ret < 0) {
2831 ret = LTTCOMM_KERN_START_FAIL;
2832 goto error;
2833 }
2834
2835 /* This start the kernel tracing */
2836 ret = kernel_start_session(ksession);
2837 if (ret < 0) {
2838 ret = LTTCOMM_KERN_START_FAIL;
2839 goto error;
2840 }
2841
2842 /* Quiescent wait after starting trace */
2843 kernel_wait_quiescent(kernel_tracer_fd);
2844 }
2845
2846 /* Flag session that trace should start automatically */
2847 if (usess) {
2848 usess->start_trace = 1;
2849
2850 ret = ust_app_start_trace_all(usess);
2851 if (ret < 0) {
2852 ret = LTTCOMM_UST_START_FAIL;
2853 goto error;
2854 }
2855 }
2856
2857 ret = LTTCOMM_OK;
2858
2859 error:
2860 return ret;
2861 }
2862
2863 /*
2864 * Command LTTNG_STOP_TRACE processed by the client thread.
2865 */
2866 static int cmd_stop_trace(struct ltt_session *session)
2867 {
2868 int ret;
2869 struct ltt_kernel_channel *kchan;
2870 struct ltt_kernel_session *ksession;
2871 struct ltt_ust_session *usess;
2872
2873 /* Short cut */
2874 ksession = session->kernel_session;
2875 usess = session->ust_session;
2876
2877 if (!session->enabled) {
2878 ret = LTTCOMM_UST_STOP_FAIL;
2879 goto error;
2880 }
2881
2882 session->enabled = 0;
2883
2884 /* Kernel tracer */
2885 if (ksession != NULL) {
2886 DBG("Stop kernel tracing");
2887
2888 /* Flush all buffers before stopping */
2889 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2890 if (ret < 0) {
2891 ERR("Kernel metadata flush failed");
2892 }
2893
2894 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2895 ret = kernel_flush_buffer(kchan);
2896 if (ret < 0) {
2897 ERR("Kernel flush buffer error");
2898 }
2899 }
2900
2901 ret = kernel_stop_session(ksession);
2902 if (ret < 0) {
2903 ret = LTTCOMM_KERN_STOP_FAIL;
2904 goto error;
2905 }
2906
2907 kernel_wait_quiescent(kernel_tracer_fd);
2908 }
2909
2910 if (usess) {
2911 usess->start_trace = 0;
2912
2913 ret = ust_app_stop_trace_all(usess);
2914 if (ret < 0) {
2915 ret = LTTCOMM_UST_STOP_FAIL;
2916 goto error;
2917 }
2918 }
2919
2920 ret = LTTCOMM_OK;
2921
2922 error:
2923 return ret;
2924 }
2925
2926 /*
2927 * Command LTTNG_CREATE_SESSION processed by the client thread.
2928 */
2929 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2930 {
2931 int ret;
2932
2933 ret = session_create(name, path, creds->uid, creds->gid);
2934 if (ret != LTTCOMM_OK) {
2935 goto error;
2936 }
2937
2938 ret = LTTCOMM_OK;
2939
2940 error:
2941 return ret;
2942 }
2943
2944 /*
2945 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2946 */
2947 static int cmd_destroy_session(struct ltt_session *session, char *name)
2948 {
2949 int ret;
2950
2951 /* Clean kernel session teardown */
2952 teardown_kernel_session(session);
2953 /* UST session teardown */
2954 teardown_ust_session(session);
2955
2956 /*
2957 * Must notify the kernel thread here to update it's poll setin order
2958 * to remove the channel(s)' fd just destroyed.
2959 */
2960 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2961 if (ret < 0) {
2962 perror("write kernel poll pipe");
2963 }
2964
2965 ret = session_destroy(session);
2966
2967 return ret;
2968 }
2969
2970 /*
2971 * Command LTTNG_CALIBRATE processed by the client thread.
2972 */
2973 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2974 {
2975 int ret;
2976
2977 switch (domain) {
2978 case LTTNG_DOMAIN_KERNEL:
2979 {
2980 struct lttng_kernel_calibrate kcalibrate;
2981
2982 kcalibrate.type = calibrate->type;
2983 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2984 if (ret < 0) {
2985 ret = LTTCOMM_KERN_ENABLE_FAIL;
2986 goto error;
2987 }
2988 break;
2989 }
2990 case LTTNG_DOMAIN_UST:
2991 {
2992 struct lttng_ust_calibrate ucalibrate;
2993
2994 ucalibrate.type = calibrate->type;
2995 ret = ust_app_calibrate_glb(&ucalibrate);
2996 if (ret < 0) {
2997 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2998 goto error;
2999 }
3000 break;
3001 }
3002 default:
3003 ret = LTTCOMM_UND;
3004 goto error;
3005 }
3006
3007 ret = LTTCOMM_OK;
3008
3009 error:
3010 return ret;
3011 }
3012
3013 /*
3014 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3015 */
3016 static int cmd_register_consumer(struct ltt_session *session, int domain,
3017 char *sock_path)
3018 {
3019 int ret, sock;
3020
3021 switch (domain) {
3022 case LTTNG_DOMAIN_KERNEL:
3023 /* Can't register a consumer if there is already one */
3024 if (session->kernel_session->consumer_fds_sent != 0) {
3025 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3026 goto error;
3027 }
3028
3029 sock = lttcomm_connect_unix_sock(sock_path);
3030 if (sock < 0) {
3031 ret = LTTCOMM_CONNECT_FAIL;
3032 goto error;
3033 }
3034
3035 session->kernel_session->consumer_fd = sock;
3036 break;
3037 default:
3038 /* TODO: Userspace tracing */
3039 ret = LTTCOMM_UND;
3040 goto error;
3041 }
3042
3043 ret = LTTCOMM_OK;
3044
3045 error:
3046 return ret;
3047 }
3048
3049 /*
3050 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3051 */
3052 static ssize_t cmd_list_domains(struct ltt_session *session,
3053 struct lttng_domain **domains)
3054 {
3055 int ret, index = 0;
3056 ssize_t nb_dom = 0;
3057
3058 if (session->kernel_session != NULL) {
3059 DBG3("Listing domains found kernel domain");
3060 nb_dom++;
3061 }
3062
3063 if (session->ust_session != NULL) {
3064 DBG3("Listing domains found UST global domain");
3065 nb_dom++;
3066 }
3067
3068 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3069 if (*domains == NULL) {
3070 ret = -LTTCOMM_FATAL;
3071 goto error;
3072 }
3073
3074 if (session->kernel_session != NULL) {
3075 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3076 index++;
3077 }
3078
3079 if (session->ust_session != NULL) {
3080 (*domains)[index].type = LTTNG_DOMAIN_UST;
3081 index++;
3082 }
3083
3084 return nb_dom;
3085
3086 error:
3087 return ret;
3088 }
3089
3090 /*
3091 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3092 */
3093 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3094 struct lttng_channel **channels)
3095 {
3096 int ret;
3097 ssize_t nb_chan = 0;
3098
3099 switch (domain) {
3100 case LTTNG_DOMAIN_KERNEL:
3101 if (session->kernel_session != NULL) {
3102 nb_chan = session->kernel_session->channel_count;
3103 }
3104 DBG3("Number of kernel channels %zd", nb_chan);
3105 break;
3106 case LTTNG_DOMAIN_UST:
3107 if (session->ust_session != NULL) {
3108 nb_chan = lttng_ht_get_count(
3109 session->ust_session->domain_global.channels);
3110 }
3111 DBG3("Number of UST global channels %zd", nb_chan);
3112 break;
3113 default:
3114 *channels = NULL;
3115 ret = -LTTCOMM_UND;
3116 goto error;
3117 }
3118
3119 if (nb_chan > 0) {
3120 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3121 if (*channels == NULL) {
3122 ret = -LTTCOMM_FATAL;
3123 goto error;
3124 }
3125
3126 list_lttng_channels(domain, session, *channels);
3127 } else {
3128 *channels = NULL;
3129 }
3130
3131 return nb_chan;
3132
3133 error:
3134 return ret;
3135 }
3136
3137 /*
3138 * Command LTTNG_LIST_EVENTS processed by the client thread.
3139 */
3140 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3141 char *channel_name, struct lttng_event **events)
3142 {
3143 int ret = 0;
3144 ssize_t nb_event = 0;
3145
3146 switch (domain) {
3147 case LTTNG_DOMAIN_KERNEL:
3148 if (session->kernel_session != NULL) {
3149 nb_event = list_lttng_kernel_events(channel_name,
3150 session->kernel_session, events);
3151 }
3152 break;
3153 case LTTNG_DOMAIN_UST:
3154 {
3155 if (session->ust_session != NULL) {
3156 nb_event = list_lttng_ust_global_events(channel_name,
3157 &session->ust_session->domain_global, events);
3158 }
3159 break;
3160 }
3161 default:
3162 ret = -LTTCOMM_UND;
3163 goto error;
3164 }
3165
3166 ret = nb_event;
3167
3168 error:
3169 return ret;
3170 }
3171
3172 /*
3173 * Process the command requested by the lttng client within the command
3174 * context structure. This function make sure that the return structure (llm)
3175 * is set and ready for transmission before returning.
3176 *
3177 * Return any error encountered or 0 for success.
3178 */
3179 static int process_client_msg(struct command_ctx *cmd_ctx)
3180 {
3181 int ret = LTTCOMM_OK;
3182 int need_tracing_session = 1;
3183
3184 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3185
3186 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3187 ret = LTTCOMM_KERN_NA;
3188 goto error;
3189 }
3190
3191 /*
3192 * Check for command that don't needs to allocate a returned payload. We do
3193 * this here so we don't have to make the call for no payload at each
3194 * command.
3195 */
3196 switch(cmd_ctx->lsm->cmd_type) {
3197 case LTTNG_LIST_SESSIONS:
3198 case LTTNG_LIST_TRACEPOINTS:
3199 case LTTNG_LIST_DOMAINS:
3200 case LTTNG_LIST_CHANNELS:
3201 case LTTNG_LIST_EVENTS:
3202 break;
3203 default:
3204 /* Setup lttng message with no payload */
3205 ret = setup_lttng_msg(cmd_ctx, 0);
3206 if (ret < 0) {
3207 /* This label does not try to unlock the session */
3208 goto init_setup_error;
3209 }
3210 }
3211
3212 /* Commands that DO NOT need a session. */
3213 switch (cmd_ctx->lsm->cmd_type) {
3214 case LTTNG_CALIBRATE:
3215 case LTTNG_CREATE_SESSION:
3216 case LTTNG_LIST_SESSIONS:
3217 case LTTNG_LIST_TRACEPOINTS:
3218 need_tracing_session = 0;
3219 break;
3220 default:
3221 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3222 session_lock_list();
3223 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3224 session_unlock_list();
3225 if (cmd_ctx->session == NULL) {
3226 if (cmd_ctx->lsm->session.name != NULL) {
3227 ret = LTTCOMM_SESS_NOT_FOUND;
3228 } else {
3229 /* If no session name specified */
3230 ret = LTTCOMM_SELECT_SESS;
3231 }
3232 goto error;
3233 } else {
3234 /* Acquire lock for the session */
3235 session_lock(cmd_ctx->session);
3236 }
3237 break;
3238 }
3239
3240 /*
3241 * Check domain type for specific "pre-action".
3242 */
3243 switch (cmd_ctx->lsm->domain.type) {
3244 case LTTNG_DOMAIN_KERNEL:
3245 if (!is_root) {
3246 ret = LTTCOMM_KERN_NA;
3247 goto error;
3248 }
3249
3250 /* Kernel tracer check */
3251 if (kernel_tracer_fd == 0) {
3252 /* Basically, load kernel tracer modules */
3253 ret = init_kernel_tracer();
3254 if (ret != 0) {
3255 goto error;
3256 }
3257 }
3258
3259 /* Need a session for kernel command */
3260 if (need_tracing_session) {
3261 if (cmd_ctx->session->kernel_session == NULL) {
3262 ret = create_kernel_session(cmd_ctx->session);
3263 if (ret < 0) {
3264 ret = LTTCOMM_KERN_SESS_FAIL;
3265 goto error;
3266 }
3267 }
3268
3269 /* Start the kernel consumer daemon */
3270 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3271 if (kconsumer_data.pid == 0 &&
3272 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3273 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3274 ret = start_consumerd(&kconsumer_data);
3275 if (ret < 0) {
3276 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3277 goto error;
3278 }
3279 } else {
3280 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3281 }
3282 }
3283 break;
3284 case LTTNG_DOMAIN_UST:
3285 {
3286 if (need_tracing_session) {
3287 if (cmd_ctx->session->ust_session == NULL) {
3288 ret = create_ust_session(cmd_ctx->session,
3289 &cmd_ctx->lsm->domain);
3290 if (ret != LTTCOMM_OK) {
3291 goto error;
3292 }
3293 }
3294 /* Start the UST consumer daemons */
3295 /* 64-bit */
3296 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3297 if (consumerd64_bin[0] != '\0' &&
3298 ustconsumer64_data.pid == 0 &&
3299 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3300 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3301 ret = start_consumerd(&ustconsumer64_data);
3302 if (ret < 0) {
3303 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3304 ust_consumerd64_fd = -EINVAL;
3305 goto error;
3306 }
3307
3308 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3309 } else {
3310 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3311 }
3312 /* 32-bit */
3313 if (consumerd32_bin[0] != '\0' &&
3314 ustconsumer32_data.pid == 0 &&
3315 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3316 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3317 ret = start_consumerd(&ustconsumer32_data);
3318 if (ret < 0) {
3319 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3320 ust_consumerd32_fd = -EINVAL;
3321 goto error;
3322 }
3323 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3324 } else {
3325 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3326 }
3327 }
3328 break;
3329 }
3330 default:
3331 break;
3332 }
3333
3334 /*
3335 * Check that the UID or GID match that of the tracing session.
3336 * The root user can interact with all sessions.
3337 */
3338 if (need_tracing_session) {
3339 if (!session_access_ok(cmd_ctx->session,
3340 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3341 ret = LTTCOMM_EPERM;
3342 goto error;
3343 }
3344 }
3345
3346 /* Process by command type */
3347 switch (cmd_ctx->lsm->cmd_type) {
3348 case LTTNG_ADD_CONTEXT:
3349 {
3350 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3351 cmd_ctx->lsm->u.context.channel_name,
3352 cmd_ctx->lsm->u.context.event_name,
3353 &cmd_ctx->lsm->u.context.ctx);
3354 break;
3355 }
3356 case LTTNG_DISABLE_CHANNEL:
3357 {
3358 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3359 cmd_ctx->lsm->u.disable.channel_name);
3360 break;
3361 }
3362 case LTTNG_DISABLE_EVENT:
3363 {
3364 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3365 cmd_ctx->lsm->u.disable.channel_name,
3366 cmd_ctx->lsm->u.disable.name);
3367 ret = LTTCOMM_OK;
3368 break;
3369 }
3370 case LTTNG_DISABLE_ALL_EVENT:
3371 {
3372 DBG("Disabling all events");
3373
3374 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3375 cmd_ctx->lsm->u.disable.channel_name);
3376 break;
3377 }
3378 case LTTNG_ENABLE_CHANNEL:
3379 {
3380 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3381 &cmd_ctx->lsm->u.channel.chan);
3382 break;
3383 }
3384 case LTTNG_ENABLE_EVENT:
3385 {
3386 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3387 cmd_ctx->lsm->u.enable.channel_name,
3388 &cmd_ctx->lsm->u.enable.event);
3389 break;
3390 }
3391 case LTTNG_ENABLE_ALL_EVENT:
3392 {
3393 DBG("Enabling all events");
3394
3395 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3396 cmd_ctx->lsm->u.enable.channel_name,
3397 cmd_ctx->lsm->u.enable.event.type);
3398 break;
3399 }
3400 case LTTNG_LIST_TRACEPOINTS:
3401 {
3402 struct lttng_event *events;
3403 ssize_t nb_events;
3404
3405 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3406 if (nb_events < 0) {
3407 ret = -nb_events;
3408 goto error;
3409 }
3410
3411 /*
3412 * Setup lttng message with payload size set to the event list size in
3413 * bytes and then copy list into the llm payload.
3414 */
3415 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3416 if (ret < 0) {
3417 free(events);
3418 goto setup_error;
3419 }
3420
3421 /* Copy event list into message payload */
3422 memcpy(cmd_ctx->llm->payload, events,
3423 sizeof(struct lttng_event) * nb_events);
3424
3425 free(events);
3426
3427 ret = LTTCOMM_OK;
3428 break;
3429 }
3430 case LTTNG_START_TRACE:
3431 {
3432 ret = cmd_start_trace(cmd_ctx->session);
3433 break;
3434 }
3435 case LTTNG_STOP_TRACE:
3436 {
3437 ret = cmd_stop_trace(cmd_ctx->session);
3438 break;
3439 }
3440 case LTTNG_CREATE_SESSION:
3441 {
3442 tracepoint(create_session_start);
3443 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3444 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3445 tracepoint(create_session_end);
3446 break;
3447 }
3448 case LTTNG_DESTROY_SESSION:
3449 {
3450 tracepoint(destroy_session_start);
3451 ret = cmd_destroy_session(cmd_ctx->session,
3452 cmd_ctx->lsm->session.name);
3453 tracepoint(destroy_session_end);
3454 break;
3455 }
3456 case LTTNG_LIST_DOMAINS:
3457 {
3458 ssize_t nb_dom;
3459 struct lttng_domain *domains;
3460
3461 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3462 if (nb_dom < 0) {
3463 ret = -nb_dom;
3464 goto error;
3465 }
3466
3467 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3468 if (ret < 0) {
3469 goto setup_error;
3470 }
3471
3472 /* Copy event list into message payload */
3473 memcpy(cmd_ctx->llm->payload, domains,
3474 nb_dom * sizeof(struct lttng_domain));
3475
3476 free(domains);
3477
3478 ret = LTTCOMM_OK;
3479 break;
3480 }
3481 case LTTNG_LIST_CHANNELS:
3482 {
3483 size_t nb_chan;
3484 struct lttng_channel *channels;
3485
3486 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3487 cmd_ctx->session, &channels);
3488 if (nb_chan < 0) {
3489 ret = -nb_chan;
3490 goto error;
3491 }
3492
3493 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3494 if (ret < 0) {
3495 goto setup_error;
3496 }
3497
3498 /* Copy event list into message payload */
3499 memcpy(cmd_ctx->llm->payload, channels,
3500 nb_chan * sizeof(struct lttng_channel));
3501
3502 free(channels);
3503
3504 ret = LTTCOMM_OK;
3505 break;
3506 }
3507 case LTTNG_LIST_EVENTS:
3508 {
3509 ssize_t nb_event;
3510 struct lttng_event *events = NULL;
3511
3512 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3513 cmd_ctx->lsm->u.list.channel_name, &events);
3514 if (nb_event < 0) {
3515 ret = -nb_event;
3516 goto error;
3517 }
3518
3519 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3520 if (ret < 0) {
3521 goto setup_error;
3522 }
3523
3524 /* Copy event list into message payload */
3525 memcpy(cmd_ctx->llm->payload, events,
3526 nb_event * sizeof(struct lttng_event));
3527
3528 free(events);
3529
3530 ret = LTTCOMM_OK;
3531 break;
3532 }
3533 case LTTNG_LIST_SESSIONS:
3534 {
3535 unsigned int nr_sessions;
3536
3537 session_lock_list();
3538 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3539 if (nr_sessions == 0) {
3540 ret = LTTCOMM_NO_SESSION;
3541 session_unlock_list();
3542 goto error;
3543 }
3544 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3545 if (ret < 0) {
3546 session_unlock_list();
3547 goto setup_error;
3548 }
3549
3550 /* Filled the session array */
3551 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3552 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3553
3554 session_unlock_list();
3555
3556 ret = LTTCOMM_OK;
3557 break;
3558 }
3559 case LTTNG_CALIBRATE:
3560 {
3561 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3562 &cmd_ctx->lsm->u.calibrate);
3563 break;
3564 }
3565 case LTTNG_REGISTER_CONSUMER:
3566 {
3567 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3568 cmd_ctx->lsm->u.reg.path);
3569 break;
3570 }
3571 default:
3572 ret = LTTCOMM_UND;
3573 break;
3574 }
3575
3576 error:
3577 if (cmd_ctx->llm == NULL) {
3578 DBG("Missing llm structure. Allocating one.");
3579 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3580 goto setup_error;
3581 }
3582 }
3583 /* Set return code */
3584 cmd_ctx->llm->ret_code = ret;
3585 setup_error:
3586 if (cmd_ctx->session) {
3587 session_unlock(cmd_ctx->session);
3588 }
3589 init_setup_error:
3590 return ret;
3591 }
3592
3593 /*
3594 * This thread manage all clients request using the unix client socket for
3595 * communication.
3596 */
3597 static void *thread_manage_clients(void *data)
3598 {
3599 int sock = 0, ret, i, pollfd;
3600 uint32_t revents, nb_fd;
3601 struct command_ctx *cmd_ctx = NULL;
3602 struct lttng_poll_event events;
3603
3604 tracepoint(sessiond_th_cli_start);
3605
3606 DBG("[thread] Manage client started");
3607
3608 rcu_register_thread();
3609
3610 ret = lttcomm_listen_unix_sock(client_sock);
3611 if (ret < 0) {
3612 goto error;
3613 }
3614
3615 /*
3616 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3617 * more will be added to this poll set.
3618 */
3619 ret = create_thread_poll_set(&events, 2);
3620 if (ret < 0) {
3621 goto error;
3622 }
3623
3624 /* Add the application registration socket */
3625 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3626 if (ret < 0) {
3627 goto error;
3628 }
3629
3630 /*
3631 * Notify parent pid that we are ready to accept command for client side.
3632 */
3633 if (opt_sig_parent) {
3634 kill(ppid, SIGUSR1);
3635 }
3636
3637 while (1) {
3638 DBG("Accepting client command ...");
3639
3640 tracepoint(sessiond_th_cli_poll);
3641
3642 nb_fd = LTTNG_POLL_GETNB(&events);
3643
3644 /* Inifinite blocking call, waiting for transmission */
3645 ret = lttng_poll_wait(&events, -1);
3646 if (ret < 0) {
3647 goto error;
3648 }
3649
3650 for (i = 0; i < nb_fd; i++) {
3651 /* Fetch once the poll data */
3652 revents = LTTNG_POLL_GETEV(&events, i);
3653 pollfd = LTTNG_POLL_GETFD(&events, i);
3654
3655 /* Thread quit pipe has been closed. Killing thread. */
3656 ret = check_thread_quit_pipe(pollfd, revents);
3657 if (ret) {
3658 goto error;
3659 }
3660
3661 /* Event on the registration socket */
3662 if (pollfd == client_sock) {
3663 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3664 ERR("Client socket poll error");
3665 goto error;
3666 }
3667 }
3668 }
3669
3670 DBG("Wait for client response");
3671
3672 sock = lttcomm_accept_unix_sock(client_sock);
3673 if (sock < 0) {
3674 goto error;
3675 }
3676
3677 /* Set socket option for credentials retrieval */
3678 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3679 if (ret < 0) {
3680 goto error;
3681 }
3682
3683 /* Allocate context command to process the client request */
3684 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3685 if (cmd_ctx == NULL) {
3686 perror("zmalloc cmd_ctx");
3687 goto error;
3688 }
3689
3690 /* Allocate data buffer for reception */
3691 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3692 if (cmd_ctx->lsm == NULL) {
3693 perror("zmalloc cmd_ctx->lsm");
3694 goto error;
3695 }
3696
3697 cmd_ctx->llm = NULL;
3698 cmd_ctx->session = NULL;
3699
3700 /*
3701 * Data is received from the lttng client. The struct
3702 * lttcomm_session_msg (lsm) contains the command and data request of
3703 * the client.
3704 */
3705 DBG("Receiving data from client ...");
3706 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3707 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3708 if (ret <= 0) {
3709 DBG("Nothing recv() from client... continuing");
3710 close(sock);
3711 free(cmd_ctx);
3712 continue;
3713 }
3714
3715 // TODO: Validate cmd_ctx including sanity check for
3716 // security purpose.
3717
3718 rcu_thread_online();
3719 /*
3720 * This function dispatch the work to the kernel or userspace tracer
3721 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3722 * informations for the client. The command context struct contains
3723 * everything this function may needs.
3724 */
3725 ret = process_client_msg(cmd_ctx);
3726 rcu_thread_offline();
3727 if (ret < 0) {
3728 /*
3729 * TODO: Inform client somehow of the fatal error. At
3730 * this point, ret < 0 means that a zmalloc failed
3731 * (ENOMEM). Error detected but still accept command.
3732 */
3733 clean_command_ctx(&cmd_ctx);
3734 continue;
3735 }
3736
3737 DBG("Sending response (size: %d, retcode: %s)",
3738 cmd_ctx->lttng_msg_size,
3739 lttng_strerror(-cmd_ctx->llm->ret_code));
3740 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3741 if (ret < 0) {
3742 ERR("Failed to send data back to client");
3743 }
3744
3745 /* End of transmission */
3746 close(sock);
3747
3748 clean_command_ctx(&cmd_ctx);
3749 }
3750
3751 error:
3752 DBG("Client thread dying");
3753 unlink(client_unix_sock_path);
3754 close(client_sock);
3755 close(sock);
3756
3757 lttng_poll_clean(&events);
3758 clean_command_ctx(&cmd_ctx);
3759
3760 rcu_unregister_thread();
3761 return NULL;
3762 }
3763
3764
3765 /*
3766 * usage function on stderr
3767 */
3768 static void usage(void)
3769 {
3770 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3771 fprintf(stderr, " -h, --help Display this usage.\n");
3772 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3773 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3774 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3775 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3776 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3777 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3778 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3779 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3780 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3781 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3782 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3783 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3784 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3785 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3786 fprintf(stderr, " -V, --version Show version number.\n");
3787 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3788 fprintf(stderr, " -q, --quiet No output at all.\n");
3789 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3790 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3791 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3792 }
3793
3794 /*
3795 * daemon argument parsing
3796 */
3797 static int parse_args(int argc, char **argv)
3798 {
3799 int c;
3800
3801 static struct option long_options[] = {
3802 { "client-sock", 1, 0, 'c' },
3803 { "apps-sock", 1, 0, 'a' },
3804 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3805 { "kconsumerd-err-sock", 1, 0, 'E' },
3806 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3807 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3808 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3809 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3810 { "consumerd32-path", 1, 0, 'u' },
3811 { "consumerd32-libdir", 1, 0, 'U' },
3812 { "consumerd64-path", 1, 0, 't' },
3813 { "consumerd64-libdir", 1, 0, 'T' },
3814 { "daemonize", 0, 0, 'd' },
3815 { "sig-parent", 0, 0, 'S' },
3816 { "help", 0, 0, 'h' },
3817 { "group", 1, 0, 'g' },
3818 { "version", 0, 0, 'V' },
3819 { "quiet", 0, 0, 'q' },
3820 { "verbose", 0, 0, 'v' },
3821 { "verbose-consumer", 0, 0, 'Z' },
3822 { "no-kernel", 0, 0, 'N' },
3823 { NULL, 0, 0, 0 }
3824 };
3825
3826 while (1) {
3827 int option_index = 0;
3828 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3829 long_options, &option_index);
3830 if (c == -1) {
3831 break;
3832 }
3833
3834 switch (c) {
3835 case 0:
3836 fprintf(stderr, "option %s", long_options[option_index].name);
3837 if (optarg) {
3838 fprintf(stderr, " with arg %s\n", optarg);
3839 }
3840 break;
3841 case 'c':
3842 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3843 break;
3844 case 'a':
3845 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3846 break;
3847 case 'd':
3848 opt_daemon = 1;
3849 break;
3850 case 'g':
3851 opt_tracing_group = optarg;
3852 break;
3853 case 'h':
3854 usage();
3855 exit(EXIT_FAILURE);
3856 case 'V':
3857 fprintf(stdout, "%s\n", VERSION);
3858 exit(EXIT_SUCCESS);
3859 case 'S':
3860 opt_sig_parent = 1;
3861 break;
3862 case 'E':
3863 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3864 break;
3865 case 'C':
3866 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3867 break;
3868 case 'F':
3869 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3870 break;
3871 case 'D':
3872 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3873 break;
3874 case 'H':
3875 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3876 break;
3877 case 'G':
3878 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3879 break;
3880 case 'N':
3881 opt_no_kernel = 1;
3882 break;
3883 case 'q':
3884 opt_quiet = 1;
3885 break;
3886 case 'v':
3887 /* Verbose level can increase using multiple -v */
3888 opt_verbose += 1;
3889 break;
3890 case 'Z':
3891 opt_verbose_consumer += 1;
3892 break;
3893 case 'u':
3894 consumerd32_bin= optarg;
3895 break;
3896 case 'U':
3897 consumerd32_libdir = optarg;
3898 break;
3899 case 't':
3900 consumerd64_bin = optarg;
3901 break;
3902 case 'T':
3903 consumerd64_libdir = optarg;
3904 break;
3905 default:
3906 /* Unknown option or other error.
3907 * Error is printed by getopt, just return */
3908 return -1;
3909 }
3910 }
3911
3912 return 0;
3913 }
3914
3915 /*
3916 * Creates the two needed socket by the daemon.
3917 * apps_sock - The communication socket for all UST apps.
3918 * client_sock - The communication of the cli tool (lttng).
3919 */
3920 static int init_daemon_socket(void)
3921 {
3922 int ret = 0;
3923 mode_t old_umask;
3924
3925 old_umask = umask(0);
3926
3927 /* Create client tool unix socket */
3928 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3929 if (client_sock < 0) {
3930 ERR("Create unix sock failed: %s", client_unix_sock_path);
3931 ret = -1;
3932 goto end;
3933 }
3934
3935 /* File permission MUST be 660 */
3936 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3937 if (ret < 0) {
3938 ERR("Set file permissions failed: %s", client_unix_sock_path);
3939 perror("chmod");
3940 goto end;
3941 }
3942
3943 /* Create the application unix socket */
3944 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3945 if (apps_sock < 0) {
3946 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3947 ret = -1;
3948 goto end;
3949 }
3950
3951 /* File permission MUST be 666 */
3952 ret = chmod(apps_unix_sock_path,
3953 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3954 if (ret < 0) {
3955 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3956 perror("chmod");
3957 goto end;
3958 }
3959
3960 end:
3961 umask(old_umask);
3962 return ret;
3963 }
3964
3965 /*
3966 * Check if the global socket is available, and if a daemon is answering at the
3967 * other side. If yes, error is returned.
3968 */
3969 static int check_existing_daemon(void)
3970 {
3971 if (access(client_unix_sock_path, F_OK) < 0 &&
3972 access(apps_unix_sock_path, F_OK) < 0) {
3973 return 0;
3974 }
3975
3976 /* Is there anybody out there ? */
3977 if (lttng_session_daemon_alive()) {
3978 return -EEXIST;
3979 } else {
3980 return 0;
3981 }
3982 }
3983
3984 /*
3985 * Set the tracing group gid onto the client socket.
3986 *
3987 * Race window between mkdir and chown is OK because we are going from more
3988 * permissive (root.root) to les permissive (root.tracing).
3989 */
3990 static int set_permissions(char *rundir)
3991 {
3992 int ret;
3993 gid_t gid;
3994
3995 gid = allowed_group();
3996 if (gid < 0) {
3997 WARN("No tracing group detected");
3998 ret = 0;
3999 goto end;
4000 }
4001
4002 /* Set lttng run dir */
4003 ret = chown(rundir, 0, gid);
4004 if (ret < 0) {
4005 ERR("Unable to set group on %s", rundir);
4006 perror("chown");
4007 }
4008
4009 /* lttng client socket path */
4010 ret = chown(client_unix_sock_path, 0, gid);
4011 if (ret < 0) {
4012 ERR("Unable to set group on %s", client_unix_sock_path);
4013 perror("chown");
4014 }
4015
4016 /* kconsumer error socket path */
4017 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4018 if (ret < 0) {
4019 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4020 perror("chown");
4021 }
4022
4023 /* 64-bit ustconsumer error socket path */
4024 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4025 if (ret < 0) {
4026 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4027 perror("chown");
4028 }
4029
4030 /* 32-bit ustconsumer compat32 error socket path */
4031 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4032 if (ret < 0) {
4033 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4034 perror("chown");
4035 }
4036
4037 DBG("All permissions are set");
4038
4039 end:
4040 return ret;
4041 }
4042
4043 /*
4044 * Create the pipe used to wake up the kernel thread.
4045 */
4046 static int create_kernel_poll_pipe(void)
4047 {
4048 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4049 }
4050
4051 /*
4052 * Create the application command pipe to wake thread_manage_apps.
4053 */
4054 static int create_apps_cmd_pipe(void)
4055 {
4056 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4057 }
4058
4059 /*
4060 * Create the lttng run directory needed for all global sockets and pipe.
4061 */
4062 static int create_lttng_rundir(const char *rundir)
4063 {
4064 int ret;
4065
4066 DBG3("Creating LTTng run directory: %s", rundir);
4067
4068 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4069 if (ret < 0) {
4070 if (errno != EEXIST) {
4071 ERR("Unable to create %s", rundir);
4072 goto error;
4073 } else {
4074 ret = 0;
4075 }
4076 }
4077
4078 error:
4079 return ret;
4080 }
4081
4082 /*
4083 * Setup sockets and directory needed by the kconsumerd communication with the
4084 * session daemon.
4085 */
4086 static int set_consumer_sockets(struct consumer_data *consumer_data,
4087 const char *rundir)
4088 {
4089 int ret;
4090 char path[PATH_MAX];
4091
4092 switch (consumer_data->type) {
4093 case LTTNG_CONSUMER_KERNEL:
4094 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4095 break;
4096 case LTTNG_CONSUMER64_UST:
4097 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4098 break;
4099 case LTTNG_CONSUMER32_UST:
4100 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4101 break;
4102 default:
4103 ERR("Consumer type unknown");
4104 ret = -EINVAL;
4105 goto error;
4106 }
4107
4108 DBG2("Creating consumer directory: %s", path);
4109
4110 ret = mkdir(path, S_IRWXU | S_IRWXG);
4111 if (ret < 0) {
4112 if (errno != EEXIST) {
4113 ERR("Failed to create %s", path);
4114 goto error;
4115 }
4116 ret = 0;
4117 }
4118
4119 /* Create the kconsumerd error unix socket */
4120 consumer_data->err_sock =
4121 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4122 if (consumer_data->err_sock < 0) {
4123 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4124 ret = -1;
4125 goto error;
4126 }
4127
4128 /* File permission MUST be 660 */
4129 ret = chmod(consumer_data->err_unix_sock_path,
4130 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4131 if (ret < 0) {
4132 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4133 PERROR("chmod");
4134 goto error;
4135 }
4136
4137 error:
4138 return ret;
4139 }
4140
4141 /*
4142 * Signal handler for the daemon
4143 *
4144 * Simply stop all worker threads, leaving main() return gracefully after
4145 * joining all threads and calling cleanup().
4146 */
4147 static void sighandler(int sig)
4148 {
4149 switch (sig) {
4150 case SIGPIPE:
4151 DBG("SIGPIPE caught");
4152 return;
4153 case SIGINT:
4154 DBG("SIGINT caught");
4155 stop_threads();
4156 break;
4157 case SIGTERM:
4158 DBG("SIGTERM caught");
4159 stop_threads();
4160 break;
4161 default:
4162 break;
4163 }
4164 }
4165
4166 /*
4167 * Setup signal handler for :
4168 * SIGINT, SIGTERM, SIGPIPE
4169 */
4170 static int set_signal_handler(void)
4171 {
4172 int ret = 0;
4173 struct sigaction sa;
4174 sigset_t sigset;
4175
4176 if ((ret = sigemptyset(&sigset)) < 0) {
4177 perror("sigemptyset");
4178 return ret;
4179 }
4180
4181 sa.sa_handler = sighandler;
4182 sa.sa_mask = sigset;
4183 sa.sa_flags = 0;
4184 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4185 perror("sigaction");
4186 return ret;
4187 }
4188
4189 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4190 perror("sigaction");
4191 return ret;
4192 }
4193
4194 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4195 perror("sigaction");
4196 return ret;
4197 }
4198
4199 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4200
4201 return ret;
4202 }
4203
4204 /*
4205 * Set open files limit to unlimited. This daemon can open a large number of
4206 * file descriptors in order to consumer multiple kernel traces.
4207 */
4208 static void set_ulimit(void)
4209 {
4210 int ret;
4211 struct rlimit lim;
4212
4213 /* The kernel does not allowed an infinite limit for open files */
4214 lim.rlim_cur = 65535;
4215 lim.rlim_max = 65535;
4216
4217 ret = setrlimit(RLIMIT_NOFILE, &lim);
4218 if (ret < 0) {
4219 perror("failed to set open files limit");
4220 }
4221 }
4222
4223 /*
4224 * main
4225 */
4226 int main(int argc, char **argv)
4227 {
4228 int ret = 0;
4229 void *status;
4230 const char *home_path;
4231
4232 tracepoint(sessiond_boot_start);
4233
4234 init_kernel_workarounds();
4235
4236 rcu_register_thread();
4237
4238 /* Create thread quit pipe */
4239 if ((ret = init_thread_quit_pipe()) < 0) {
4240 goto error;
4241 }
4242
4243 setup_consumerd_path();
4244
4245 /* Parse arguments */
4246 progname = argv[0];
4247 if ((ret = parse_args(argc, argv) < 0)) {
4248 goto error;
4249 }
4250
4251 /* Daemonize */
4252 if (opt_daemon) {
4253 ret = daemon(0, 0);
4254 if (ret < 0) {
4255 perror("daemon");
4256 goto error;
4257 }
4258 }
4259
4260 /* Check if daemon is UID = 0 */
4261 is_root = !getuid();
4262
4263 if (is_root) {
4264 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4265
4266 /* Create global run dir with root access */
4267 ret = create_lttng_rundir(rundir);
4268 if (ret < 0) {
4269 goto error;
4270 }
4271
4272 if (strlen(apps_unix_sock_path) == 0) {
4273 snprintf(apps_unix_sock_path, PATH_MAX,
4274 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4275 }
4276
4277 if (strlen(client_unix_sock_path) == 0) {
4278 snprintf(client_unix_sock_path, PATH_MAX,
4279 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4280 }
4281
4282 /* Set global SHM for ust */
4283 if (strlen(wait_shm_path) == 0) {
4284 snprintf(wait_shm_path, PATH_MAX,
4285 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4286 }
4287
4288 /* Setup kernel consumerd path */
4289 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4290 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4291 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4292 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4293
4294 DBG2("Kernel consumer err path: %s",
4295 kconsumer_data.err_unix_sock_path);
4296 DBG2("Kernel consumer cmd path: %s",
4297 kconsumer_data.cmd_unix_sock_path);
4298 } else {
4299 home_path = get_home_dir();
4300 if (home_path == NULL) {
4301 /* TODO: Add --socket PATH option */
4302 ERR("Can't get HOME directory for sockets creation.");
4303 ret = -EPERM;
4304 goto error;
4305 }
4306
4307 /*
4308 * Create rundir from home path. This will create something like
4309 * $HOME/.lttng
4310 */
4311 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4312 if (ret < 0) {
4313 ret = -ENOMEM;
4314 goto error;
4315 }
4316
4317 ret = create_lttng_rundir(rundir);
4318 if (ret < 0) {
4319 goto error;
4320 }
4321
4322 if (strlen(apps_unix_sock_path) == 0) {
4323 snprintf(apps_unix_sock_path, PATH_MAX,
4324 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4325 }
4326
4327 /* Set the cli tool unix socket path */
4328 if (strlen(client_unix_sock_path) == 0) {
4329 snprintf(client_unix_sock_path, PATH_MAX,
4330 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4331 }
4332
4333 /* Set global SHM for ust */
4334 if (strlen(wait_shm_path) == 0) {
4335 snprintf(wait_shm_path, PATH_MAX,
4336 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4337 }
4338 }
4339
4340 DBG("Client socket path %s", client_unix_sock_path);
4341 DBG("Application socket path %s", apps_unix_sock_path);
4342 DBG("LTTng run directory path: %s", rundir);
4343
4344 /* 32 bits consumerd path setup */
4345 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4346 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4347 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4348 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4349
4350 DBG2("UST consumer 32 bits err path: %s",
4351 ustconsumer32_data.err_unix_sock_path);
4352 DBG2("UST consumer 32 bits cmd path: %s",
4353 ustconsumer32_data.cmd_unix_sock_path);
4354
4355 /* 64 bits consumerd path setup */
4356 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4357 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4358 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4359 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4360
4361 DBG2("UST consumer 64 bits err path: %s",
4362 ustconsumer64_data.err_unix_sock_path);
4363 DBG2("UST consumer 64 bits cmd path: %s",
4364 ustconsumer64_data.cmd_unix_sock_path);
4365
4366 /*
4367 * See if daemon already exist.
4368 */
4369 if ((ret = check_existing_daemon()) < 0) {
4370 ERR("Already running daemon.\n");
4371 /*
4372 * We do not goto exit because we must not cleanup()
4373 * because a daemon is already running.
4374 */
4375 goto error;
4376 }
4377
4378 /* After this point, we can safely call cleanup() with "goto exit" */
4379
4380 /*
4381 * These actions must be executed as root. We do that *after* setting up
4382 * the sockets path because we MUST make the check for another daemon using
4383 * those paths *before* trying to set the kernel consumer sockets and init
4384 * kernel tracer.
4385 */
4386 if (is_root) {
4387 ret = set_consumer_sockets(&kconsumer_data, rundir);
4388 if (ret < 0) {
4389 goto exit;
4390 }
4391
4392 /* Setup kernel tracer */
4393 if (!opt_no_kernel) {
4394 init_kernel_tracer();
4395 }
4396
4397 /* Set ulimit for open files */
4398 set_ulimit();
4399 }
4400
4401 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4402 if (ret < 0) {
4403 goto exit;
4404 }
4405
4406 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4407 if (ret < 0) {
4408 goto exit;
4409 }
4410
4411 if ((ret = set_signal_handler()) < 0) {
4412 goto exit;
4413 }
4414
4415 /* Setup the needed unix socket */
4416 if ((ret = init_daemon_socket()) < 0) {
4417 goto exit;
4418 }
4419
4420 /* Set credentials to socket */
4421 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4422 goto exit;
4423 }
4424
4425 /* Get parent pid if -S, --sig-parent is specified. */
4426 if (opt_sig_parent) {
4427 ppid = getppid();
4428 }
4429
4430 /* Setup the kernel pipe for waking up the kernel thread */
4431 if ((ret = create_kernel_poll_pipe()) < 0) {
4432 goto exit;
4433 }
4434
4435 /* Setup the thread apps communication pipe. */
4436 if ((ret = create_apps_cmd_pipe()) < 0) {
4437 goto exit;
4438 }
4439
4440 /* Init UST command queue. */
4441 cds_wfq_init(&ust_cmd_queue.queue);
4442
4443 /* Init UST app hash table */
4444 ust_app_ht_alloc();
4445
4446 /*
4447 * Get session list pointer. This pointer MUST NOT be free(). This list is
4448 * statically declared in session.c
4449 */
4450 session_list_ptr = session_get_list();
4451
4452 /* Set up max poll set size */
4453 lttng_poll_set_max_size();
4454
4455 /* Create thread to manage the client socket */
4456 ret = pthread_create(&client_thread, NULL,
4457 thread_manage_clients, (void *) NULL);
4458 if (ret != 0) {
4459 perror("pthread_create clients");
4460 goto exit_client;
4461 }
4462
4463 /* Create thread to dispatch registration */
4464 ret = pthread_create(&dispatch_thread, NULL,
4465 thread_dispatch_ust_registration, (void *) NULL);
4466 if (ret != 0) {
4467 perror("pthread_create dispatch");
4468 goto exit_dispatch;
4469 }
4470
4471 /* Create thread to manage application registration. */
4472 ret = pthread_create(&reg_apps_thread, NULL,
4473 thread_registration_apps, (void *) NULL);
4474 if (ret != 0) {
4475 perror("pthread_create registration");
4476 goto exit_reg_apps;
4477 }
4478
4479 /* Create thread to manage application socket */
4480 ret = pthread_create(&apps_thread, NULL,
4481 thread_manage_apps, (void *) NULL);
4482 if (ret != 0) {
4483 perror("pthread_create apps");
4484 goto exit_apps;
4485 }
4486
4487 /* Create kernel thread to manage kernel event */
4488 ret = pthread_create(&kernel_thread, NULL,
4489 thread_manage_kernel, (void *) NULL);
4490 if (ret != 0) {
4491 perror("pthread_create kernel");
4492 goto exit_kernel;
4493 }
4494
4495 tracepoint(sessiond_boot_end);
4496
4497 ret = pthread_join(kernel_thread, &status);
4498 if (ret != 0) {
4499 perror("pthread_join");
4500 goto error; /* join error, exit without cleanup */
4501 }
4502
4503 exit_kernel:
4504 ret = pthread_join(apps_thread, &status);
4505 if (ret != 0) {
4506 perror("pthread_join");
4507 goto error; /* join error, exit without cleanup */
4508 }
4509
4510 exit_apps:
4511 ret = pthread_join(reg_apps_thread, &status);
4512 if (ret != 0) {
4513 perror("pthread_join");
4514 goto error; /* join error, exit without cleanup */
4515 }
4516
4517 exit_reg_apps:
4518 ret = pthread_join(dispatch_thread, &status);
4519 if (ret != 0) {
4520 perror("pthread_join");
4521 goto error; /* join error, exit without cleanup */
4522 }
4523
4524 exit_dispatch:
4525 ret = pthread_join(client_thread, &status);
4526 if (ret != 0) {
4527 perror("pthread_join");
4528 goto error; /* join error, exit without cleanup */
4529 }
4530
4531 ret = join_consumer_thread(&kconsumer_data);
4532 if (ret != 0) {
4533 perror("join_consumer");
4534 goto error; /* join error, exit without cleanup */
4535 }
4536
4537 exit_client:
4538 exit:
4539 /*
4540 * cleanup() is called when no other thread is running.
4541 */
4542 rcu_thread_online();
4543 cleanup();
4544 rcu_thread_offline();
4545 rcu_unregister_thread();
4546 if (!ret) {
4547 exit(EXIT_SUCCESS);
4548 }
4549 error:
4550 exit(EXIT_FAILURE);
4551 }
LTTng 2.0 tools and control repository
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