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Add support for passing credentials over Unix sock
[lttng-tools.git] / 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 <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
44
45 #include <lttngerr.h>
46
47 #include "channel.h"
48 #include "compat/poll.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "hashtable.h"
53 #include "kernel.h"
54 #include "lttng-sessiond.h"
55 #include "shm.h"
56 #include "ust-app.h"
57 #include "ust-ctl.h"
58 #include "utils.h"
59
60 #define CONSUMERD_FILE "lttng-consumerd"
61
62 struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78 };
79
80 /* Const values */
81 const char default_home_dir[] = DEFAULT_HOME_DIR;
82 const char default_tracing_group[] = LTTNG_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 = KCONSUMERD_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
105 };
106 static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
108 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
110 };
111 static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
113 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = 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 =
177 __stringify(CONFIG_CONSUMERD32_BIN);
178 static const char *consumerd64_bin =
179 __stringify(CONFIG_CONSUMERD64_BIN);
180 static const char *consumerd32_libdir =
181 __stringify(CONFIG_CONSUMERD32_LIBDIR);
182 static const char *consumerd64_libdir =
183 __stringify(CONFIG_CONSUMERD64_LIBDIR);
184
185 static
186 void setup_consumerd_path(void)
187 {
188 const char *bin, *libdir;
189
190 /*
191 * Allow INSTALL_BIN_PATH to be used as a target path for the
192 * native architecture size consumer if CONFIG_CONSUMER*_PATH
193 * has not been defined.
194 */
195 #if (CAA_BITS_PER_LONG == 32)
196 if (!consumerd32_bin[0]) {
197 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
198 }
199 if (!consumerd32_libdir[0]) {
200 consumerd32_libdir = INSTALL_LIB_PATH;
201 }
202 #elif (CAA_BITS_PER_LONG == 64)
203 if (!consumerd64_bin[0]) {
204 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
205 }
206 if (!consumerd64_libdir[0]) {
207 consumerd64_libdir = INSTALL_LIB_PATH;
208 }
209 #else
210 #error "Unknown bitness"
211 #endif
212
213 /*
214 * runtime env. var. overrides the build default.
215 */
216 bin = getenv("LTTNG_CONSUMERD32_BIN");
217 if (bin) {
218 consumerd32_bin = bin;
219 }
220 bin = getenv("LTTNG_CONSUMERD64_BIN");
221 if (bin) {
222 consumerd64_bin = bin;
223 }
224 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
225 if (libdir) {
226 consumerd32_libdir = libdir;
227 }
228 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
229 if (libdir) {
230 consumerd64_libdir = libdir;
231 }
232 }
233
234 /*
235 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 */
237 static int create_thread_poll_set(struct lttng_poll_event *events,
238 unsigned int size)
239 {
240 int ret;
241
242 if (events == NULL || size == 0) {
243 ret = -1;
244 goto error;
245 }
246
247 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
248 if (ret < 0) {
249 goto error;
250 }
251
252 /* Add quit pipe */
253 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
254 if (ret < 0) {
255 goto error;
256 }
257
258 return 0;
259
260 error:
261 return ret;
262 }
263
264 /*
265 * Check if the thread quit pipe was triggered.
266 *
267 * Return 1 if it was triggered else 0;
268 */
269 static int check_thread_quit_pipe(int fd, uint32_t events)
270 {
271 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
272 return 1;
273 }
274
275 return 0;
276 }
277
278 /*
279 * Remove modules in reverse load order.
280 */
281 static int modprobe_remove_kernel_modules(void)
282 {
283 int ret = 0, i;
284 char modprobe[256];
285
286 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
287 ret = snprintf(modprobe, sizeof(modprobe),
288 "/sbin/modprobe -r -q %s",
289 kernel_modules_list[i].name);
290 if (ret < 0) {
291 perror("snprintf modprobe -r");
292 goto error;
293 }
294 modprobe[sizeof(modprobe) - 1] = '\0';
295 ret = system(modprobe);
296 if (ret == -1) {
297 ERR("Unable to launch modprobe -r for module %s",
298 kernel_modules_list[i].name);
299 } else if (kernel_modules_list[i].required
300 && WEXITSTATUS(ret) != 0) {
301 ERR("Unable to remove module %s",
302 kernel_modules_list[i].name);
303 } else {
304 DBG("Modprobe removal successful %s",
305 kernel_modules_list[i].name);
306 }
307 }
308
309 error:
310 return ret;
311 }
312
313 /*
314 * Return group ID of the tracing group or -1 if not found.
315 */
316 static gid_t allowed_group(void)
317 {
318 struct group *grp;
319
320 if (opt_tracing_group) {
321 grp = getgrnam(opt_tracing_group);
322 } else {
323 grp = getgrnam(default_tracing_group);
324 }
325 if (!grp) {
326 return -1;
327 } else {
328 return grp->gr_gid;
329 }
330 }
331
332 /*
333 * Init thread quit pipe.
334 *
335 * Return -1 on error or 0 if all pipes are created.
336 */
337 static int init_thread_quit_pipe(void)
338 {
339 int ret;
340
341 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
342 if (ret < 0) {
343 perror("thread quit pipe");
344 goto error;
345 }
346
347 error:
348 return ret;
349 }
350
351 /*
352 * Complete teardown of a kernel session. This free all data structure related
353 * to a kernel session and update counter.
354 */
355 static void teardown_kernel_session(struct ltt_session *session)
356 {
357 if (!session->kernel_session) {
358 DBG3("No kernel session when tearingdown session");
359 return;
360 }
361
362 DBG("Tearing down kernel session");
363
364 /*
365 * If a custom kernel consumer was registered, close the socket before
366 * tearing down the complete kernel session structure
367 */
368 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
369 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
370 }
371
372 trace_kernel_destroy_session(session->kernel_session);
373 }
374
375 /*
376 * Complete teardown of all UST sessions. This will free everything on his path
377 * and destroy the core essence of all ust sessions :)
378 */
379 static void teardown_ust_session(struct ltt_session *session)
380 {
381 int ret;
382
383 if (!session->ust_session) {
384 DBG3("No UST session when tearingdown session");
385 return;
386 }
387
388 DBG("Tearing down UST session(s)");
389
390 ret = ust_app_destroy_trace_all(session->ust_session);
391 if (ret) {
392 ERR("Error in ust_app_destroy_trace_all");
393 }
394
395 trace_ust_destroy_session(session->ust_session);
396 }
397
398 /*
399 * Stop all threads by closing the thread quit pipe.
400 */
401 static void stop_threads(void)
402 {
403 int ret;
404
405 /* Stopping all threads */
406 DBG("Terminating all threads");
407 ret = notify_thread_pipe(thread_quit_pipe[1]);
408 if (ret < 0) {
409 ERR("write error on thread quit pipe");
410 }
411
412 /* Dispatch thread */
413 dispatch_thread_exit = 1;
414 futex_nto1_wake(&ust_cmd_queue.futex);
415 }
416
417 /*
418 * Cleanup the daemon
419 */
420 static void cleanup(void)
421 {
422 int ret;
423 char *cmd;
424 struct ltt_session *sess, *stmp;
425
426 DBG("Cleaning up");
427
428 DBG("Removing %s directory", rundir);
429 ret = asprintf(&cmd, "rm -rf %s", rundir);
430 if (ret < 0) {
431 ERR("asprintf failed. Something is really wrong!");
432 }
433
434 /* Remove lttng run directory */
435 ret = system(cmd);
436 if (ret < 0) {
437 ERR("Unable to clean %s", rundir);
438 }
439 free(cmd);
440
441 DBG("Cleaning up all session");
442
443 /* Destroy session list mutex */
444 if (session_list_ptr != NULL) {
445 pthread_mutex_destroy(&session_list_ptr->lock);
446
447 /* Cleanup ALL session */
448 cds_list_for_each_entry_safe(sess, stmp,
449 &session_list_ptr->head, list) {
450 teardown_kernel_session(sess);
451 teardown_ust_session(sess);
452 free(sess);
453 }
454 }
455
456 DBG("Closing all UST sockets");
457 ust_app_clean_list();
458
459 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
460
461 if (is_root && !opt_no_kernel) {
462 DBG2("Closing kernel fd");
463 close(kernel_tracer_fd);
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
470
471 /* <fun> */
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
476 }
477
478 /*
479 * Send data on a unix socket using the liblttsessiondcomm API.
480 *
481 * Return lttcomm error code.
482 */
483 static int send_unix_sock(int sock, void *buf, size_t len)
484 {
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491 }
492
493 /*
494 * Free memory of a command context structure.
495 */
496 static void clean_command_ctx(struct command_ctx **cmd_ctx)
497 {
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
502 }
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
505 }
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
508 }
509 }
510
511 /*
512 * Send all stream fds of kernel channel to the consumer.
513 */
514 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
515 int sock, struct ltt_kernel_channel *channel)
516 {
517 int ret;
518 struct ltt_kernel_stream *stream;
519 struct lttcomm_consumer_msg lkm;
520
521 DBG("Sending streams of channel %s to kernel consumer",
522 channel->channel->name);
523
524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
531 if (ret < 0) {
532 perror("send consumer channel");
533 goto error;
534 }
535
536 /* Send streams */
537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
559 }
560 }
561
562 DBG("consumer channel streams sent");
563
564 return 0;
565
566 error:
567 return ret;
568 }
569
570 /*
571 * Send all stream fds of the kernel session to the consumer.
572 */
573 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
574 struct ltt_kernel_session *session)
575 {
576 int ret;
577 struct ltt_kernel_channel *chan;
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
580
581 DBG("Sending metadata stream fd");
582
583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
584 if (session->consumer_fd == 0) {
585 session->consumer_fd = consumer_data->cmd_sock;
586 }
587
588 if (session->metadata_stream_fd != 0) {
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
617 if (ret < 0) {
618 perror("send consumer stream");
619 goto error;
620 }
621 }
622
623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634 error:
635 return ret;
636 }
637
638 /*
639 * Notify UST applications using the shm mmap futex.
640 */
641 static int notify_ust_apps(int active)
642 {
643 char *wait_shm_mmap;
644
645 DBG("Notifying applications of session daemon state: %d", active);
646
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
650 goto error;
651 }
652
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
658
659 error:
660 return -1;
661 }
662
663 /*
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
667 *
668 * Return total size of the buffer pointed by buf.
669 */
670 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
671 {
672 int ret, buf_size;
673
674 buf_size = size;
675
676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
677 if (cmd_ctx->llm == NULL) {
678 perror("zmalloc");
679 ret = -ENOMEM;
680 goto error;
681 }
682
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
686
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
690 return buf_size;
691
692 error:
693 return ret;
694 }
695
696 /*
697 * Update the kernel poll set of all channel fd available over all tracing
698 * session. Add the wakeup pipe at the end of the set.
699 */
700 static int update_kernel_poll(struct lttng_poll_event *events)
701 {
702 int ret;
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
706 DBG("Updating kernel poll set");
707
708 session_lock_list();
709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
710 session_lock(session);
711 if (session->kernel_session == NULL) {
712 session_unlock(session);
713 continue;
714 }
715
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
721 session_unlock(session);
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
725 }
726 session_unlock(session);
727 }
728 session_unlock_list();
729
730 return 0;
731
732 error:
733 session_unlock_list();
734 return -1;
735 }
736
737 /*
738 * Find the channel fd from 'fd' over all tracing session. When found, check
739 * for new channel stream and send those stream fds to the kernel consumer.
740 *
741 * Useful for CPU hotplug feature.
742 */
743 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
744 {
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
751 session_lock_list();
752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
753 session_lock(session);
754 if (session->kernel_session == NULL) {
755 session_unlock(session);
756 continue;
757 }
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
762 }
763
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
770 goto error;
771 }
772
773 /*
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
777 */
778 if (session->kernel_session->consumer_fds_sent == 1) {
779 ret = send_kconsumer_channel_streams(consumer_data,
780 session->kernel_session->consumer_fd, channel);
781 if (ret < 0) {
782 goto error;
783 }
784 }
785 goto error;
786 }
787 }
788 session_unlock(session);
789 }
790 session_unlock_list();
791 return ret;
792
793 error:
794 session_unlock(session);
795 session_unlock_list();
796 return ret;
797 }
798
799 /*
800 * For each tracing session, update newly registered apps.
801 */
802 static void update_ust_app(int app_sock)
803 {
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
811 }
812 }
813
814 /*
815 * This thread manage event coming from the kernel.
816 *
817 * Features supported in this thread:
818 * -) CPU Hotplug
819 */
820 static void *thread_manage_kernel(void *data)
821 {
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
824 char tmp;
825 struct lttng_poll_event events;
826
827 DBG("Thread manage kernel started");
828
829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
839 while (1) {
840 if (update_poll_flag == 1) {
841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
860
861 /* Poll infinite value of time */
862 ret = lttng_poll_wait(&events, -1);
863 if (ret < 0) {
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
869 continue;
870 }
871
872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
876
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
882
883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
894 ret = update_kernel_stream(&kconsumer_data, pollfd);
895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
903 }
904 }
905 }
906 }
907
908 error:
909 DBG("Kernel thread dying");
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
912
913 lttng_poll_clean(&events);
914
915 return NULL;
916 }
917
918 /*
919 * This thread manage the consumer error sent back to the session daemon.
920 */
921 static void *thread_manage_consumer(void *data)
922 {
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
925 enum lttcomm_return_code code;
926 struct lttng_poll_event events;
927 struct consumer_data *consumer_data = data;
928
929 DBG("[thread] Manage consumer started");
930
931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
932 if (ret < 0) {
933 goto error;
934 }
935
936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
944
945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
951
952 /* Inifinite blocking call, waiting for transmission */
953 ret = lttng_poll_wait(&events, -1);
954 if (ret < 0) {
955 goto error;
956 }
957
958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
970 if (pollfd == consumer_data->err_sock) {
971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
972 ERR("consumer err socket poll error");
973 goto error;
974 }
975 }
976 }
977
978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
979 if (sock < 0) {
980 goto error;
981 }
982
983 DBG2("Receiving code from consumer err_sock");
984
985 /* Getting status code from kconsumerd */
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
988 if (ret <= 0) {
989 goto error;
990 }
991
992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
997 PERROR("consumer connect");
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1003 } else {
1004 ERR("consumer error when waiting for SOCK_READY : %s",
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
1009 /* Remove the kconsumerd error sock since we've established a connexion */
1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
1011 if (ret < 0) {
1012 goto error;
1013 }
1014
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
1017 goto error;
1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
1026 goto error;
1027 }
1028
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1043 ERR("consumer err socket second poll error");
1044 goto error;
1045 }
1046 }
1047 }
1048
1049 /* Wait for any kconsumerd error */
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
1052 if (ret <= 0) {
1053 ERR("consumer closed the command socket");
1054 goto error;
1055 }
1056
1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1058
1059 error:
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
1063 close(sock);
1064
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1068
1069 lttng_poll_clean(&events);
1070
1071 return NULL;
1072 }
1073
1074 /*
1075 * This thread manage application communication.
1076 */
1077 static void *thread_manage_apps(void *data)
1078 {
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
1081 struct ust_command ust_cmd;
1082 struct lttng_poll_event events;
1083
1084 DBG("[thread] Manage application started");
1085
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
1093
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
1098
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
1102
1103 nb_fd = LTTNG_POLL_GETNB(&events);
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
1108 ret = lttng_poll_wait(&events, -1);
1109 if (ret < 0) {
1110 goto error;
1111 }
1112
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
1121 goto error;
1122 }
1123
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
1128 goto error;
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
1136
1137 /* Register applicaton to the session daemon */
1138 ret = ust_app_register(&ust_cmd.reg_msg,
1139 ust_cmd.sock);
1140 if (ret == -ENOMEM) {
1141 goto error;
1142 } else if (ret < 0) {
1143 break;
1144 }
1145
1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
1158 ust_app_unregister(ust_cmd.sock);
1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
1171 }
1172
1173 break;
1174 }
1175 } else {
1176 /*
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
1186
1187 /* Socket closed on remote end. */
1188 ust_app_unregister(pollfd);
1189 break;
1190 }
1191 }
1192 }
1193 }
1194
1195 error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
1200 lttng_poll_clean(&events);
1201
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
1204 return NULL;
1205 }
1206
1207 /*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211 static void *thread_dispatch_ust_registration(void *data)
1212 {
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
1227 DBG("Woken up but nothing in the UST command queue");
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266 error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269 }
1270
1271 /*
1272 * This thread manage application registration.
1273 */
1274 static void *thread_registration_apps(void *data)
1275 {
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1284
1285 DBG("[thread] Manage application registration started");
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
1300
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
1306
1307 /* Notify all applications to register */
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
1313 }
1314
1315 while (1) {
1316 DBG("Accepting application registration");
1317
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
1320 /* Inifinite blocking call, waiting for transmission */
1321 ret = lttng_poll_wait(&events, -1);
1322 if (ret < 0) {
1323 goto error;
1324 }
1325
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
1330
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
1334 goto error;
1335 }
1336
1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
1347
1348 /* Create UST registration command for enqueuing */
1349 ust_cmd = zmalloc(sizeof(struct ust_command));
1350 if (ust_cmd == NULL) {
1351 perror("ust command zmalloc");
1352 goto error;
1353 }
1354
1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
1371
1372 ust_cmd->sock = sock;
1373
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1380
1381 /*
1382 * Lock free enqueue the registration request. The red pill
1383 * has been taken! This apps will be part of the *system*.
1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
1394 }
1395 }
1396
1397 error:
1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
1405 unlink(apps_unix_sock_path);
1406
1407 lttng_poll_clean(&events);
1408
1409 return NULL;
1410 }
1411
1412 /*
1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1414 * exec or it will fails.
1415 */
1416 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1417 {
1418 int ret;
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
1423
1424 /* Setup semaphore */
1425 ret = sem_init(&consumer_data->sem, 0, 0);
1426 if (ret < 0) {
1427 PERROR("sem_init consumer semaphore");
1428 goto error;
1429 }
1430
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
1433 if (ret != 0) {
1434 PERROR("pthread_create consumer");
1435 ret = -1;
1436 goto error;
1437 }
1438
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
1442 PERROR("clock_gettime spawn consumer");
1443 /* Infinite wait for the kconsumerd thread to be ready */
1444 ret = sem_wait(&consumer_data->sem);
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
1449 }
1450
1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
1459 if (ret < 0) {
1460 PERROR("pthread_cancel consumer thread");
1461 }
1462 } else {
1463 PERROR("semaphore wait failed consumer thread");
1464 }
1465 goto error;
1466 }
1467
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
1470 ERR("Kconsumerd did not start");
1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
1472 goto error;
1473 }
1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
1475
1476 return 0;
1477
1478 error:
1479 return ret;
1480 }
1481
1482 /*
1483 * Join consumer thread
1484 */
1485 static int join_consumer_thread(struct consumer_data *consumer_data)
1486 {
1487 void *status;
1488 int ret;
1489
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
1492 if (ret) {
1493 ERR("Error killing consumer daemon");
1494 return ret;
1495 }
1496 return pthread_join(consumer_data->thread, &status);
1497 } else {
1498 return 0;
1499 }
1500 }
1501
1502 /*
1503 * Fork and exec a consumer daemon (consumerd).
1504 *
1505 * Return pid if successful else -1.
1506 */
1507 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1508 {
1509 int ret;
1510 pid_t pid;
1511 const char *consumer_to_use;
1512 const char *verbosity;
1513 struct stat st;
1514
1515 DBG("Spawning consumerd");
1516
1517 pid = fork();
1518 if (pid == 0) {
1519 /*
1520 * Exec consumerd.
1521 */
1522 if (opt_verbose > 1 || opt_verbose_consumer) {
1523 verbosity = "--verbose";
1524 } else {
1525 verbosity = "--quiet";
1526 }
1527 switch (consumer_data->type) {
1528 case LTTNG_CONSUMER_KERNEL:
1529 /*
1530 * Find out which consumerd to execute. We will
1531 * first try the 64-bit path, then the
1532 * sessiond's installation directory, and
1533 * fallback on the 32-bit one,
1534 */
1535 if (stat(consumerd64_bin, &st) == 0) {
1536 consumer_to_use = consumerd64_bin;
1537 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1538 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1539 } else if (stat(consumerd32_bin, &st) == 0) {
1540 consumer_to_use = consumerd32_bin;
1541 } else {
1542 break;
1543 }
1544 DBG("Using kernel consumer at: %s", consumer_to_use);
1545 execl(consumer_to_use,
1546 "lttng-consumerd", verbosity, "-k",
1547 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1548 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1549 NULL);
1550 break;
1551 case LTTNG_CONSUMER64_UST:
1552 {
1553 char *tmpnew = NULL;
1554
1555 if (consumerd64_libdir[0] != '\0') {
1556 char *tmp;
1557 size_t tmplen;
1558
1559 tmp = getenv("LD_LIBRARY_PATH");
1560 if (!tmp) {
1561 tmp = "";
1562 }
1563 tmplen = strlen("LD_LIBRARY_PATH=")
1564 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1565 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1566 if (!tmpnew) {
1567 ret = -ENOMEM;
1568 goto error;
1569 }
1570 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1571 strcat(tmpnew, consumerd64_libdir);
1572 if (tmp[0] != '\0') {
1573 strcat(tmpnew, ":");
1574 strcat(tmpnew, tmp);
1575 }
1576 ret = putenv(tmpnew);
1577 if (ret) {
1578 ret = -errno;
1579 goto error;
1580 }
1581 }
1582 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1583 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1584 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1585 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1586 NULL);
1587 if (consumerd64_libdir[0] != '\0') {
1588 free(tmpnew);
1589 }
1590 if (ret) {
1591 goto error;
1592 }
1593 break;
1594 }
1595 case LTTNG_CONSUMER32_UST:
1596 {
1597 char *tmpnew = NULL;
1598
1599 if (consumerd32_libdir[0] != '\0') {
1600 char *tmp;
1601 size_t tmplen;
1602
1603 tmp = getenv("LD_LIBRARY_PATH");
1604 if (!tmp) {
1605 tmp = "";
1606 }
1607 tmplen = strlen("LD_LIBRARY_PATH=")
1608 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1609 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1610 if (!tmpnew) {
1611 ret = -ENOMEM;
1612 goto error;
1613 }
1614 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1615 strcat(tmpnew, consumerd32_libdir);
1616 if (tmp[0] != '\0') {
1617 strcat(tmpnew, ":");
1618 strcat(tmpnew, tmp);
1619 }
1620 ret = putenv(tmpnew);
1621 if (ret) {
1622 ret = -errno;
1623 goto error;
1624 }
1625 }
1626 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1627 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1628 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1629 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1630 NULL);
1631 if (consumerd32_libdir[0] != '\0') {
1632 free(tmpnew);
1633 }
1634 if (ret) {
1635 goto error;
1636 }
1637 break;
1638 }
1639 default:
1640 perror("unknown consumer type");
1641 exit(EXIT_FAILURE);
1642 }
1643 if (errno != 0) {
1644 perror("kernel start consumer exec");
1645 }
1646 exit(EXIT_FAILURE);
1647 } else if (pid > 0) {
1648 ret = pid;
1649 } else {
1650 perror("start consumer fork");
1651 ret = -errno;
1652 }
1653 error:
1654 return ret;
1655 }
1656
1657 /*
1658 * Spawn the consumerd daemon and session daemon thread.
1659 */
1660 static int start_consumerd(struct consumer_data *consumer_data)
1661 {
1662 int ret;
1663
1664 pthread_mutex_lock(&consumer_data->pid_mutex);
1665 if (consumer_data->pid != 0) {
1666 pthread_mutex_unlock(&consumer_data->pid_mutex);
1667 goto end;
1668 }
1669
1670 ret = spawn_consumerd(consumer_data);
1671 if (ret < 0) {
1672 ERR("Spawning consumerd failed");
1673 pthread_mutex_unlock(&consumer_data->pid_mutex);
1674 goto error;
1675 }
1676
1677 /* Setting up the consumer_data pid */
1678 consumer_data->pid = ret;
1679 DBG2("Consumer pid %d", consumer_data->pid);
1680 pthread_mutex_unlock(&consumer_data->pid_mutex);
1681
1682 DBG2("Spawning consumer control thread");
1683 ret = spawn_consumer_thread(consumer_data);
1684 if (ret < 0) {
1685 ERR("Fatal error spawning consumer control thread");
1686 goto error;
1687 }
1688
1689 end:
1690 return 0;
1691
1692 error:
1693 return ret;
1694 }
1695
1696 /*
1697 * modprobe_kernel_modules
1698 */
1699 static int modprobe_kernel_modules(void)
1700 {
1701 int ret = 0, i;
1702 char modprobe[256];
1703
1704 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1705 ret = snprintf(modprobe, sizeof(modprobe),
1706 "/sbin/modprobe %s%s",
1707 kernel_modules_list[i].required ? "" : "-q ",
1708 kernel_modules_list[i].name);
1709 if (ret < 0) {
1710 perror("snprintf modprobe");
1711 goto error;
1712 }
1713 modprobe[sizeof(modprobe) - 1] = '\0';
1714 ret = system(modprobe);
1715 if (ret == -1) {
1716 ERR("Unable to launch modprobe for module %s",
1717 kernel_modules_list[i].name);
1718 } else if (kernel_modules_list[i].required
1719 && WEXITSTATUS(ret) != 0) {
1720 ERR("Unable to load module %s",
1721 kernel_modules_list[i].name);
1722 } else {
1723 DBG("Modprobe successfully %s",
1724 kernel_modules_list[i].name);
1725 }
1726 }
1727
1728 error:
1729 return ret;
1730 }
1731
1732 /*
1733 * mount_debugfs
1734 */
1735 static int mount_debugfs(char *path)
1736 {
1737 int ret;
1738 char *type = "debugfs";
1739
1740 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1741 if (ret < 0) {
1742 PERROR("Cannot create debugfs path");
1743 goto error;
1744 }
1745
1746 ret = mount(type, path, type, 0, NULL);
1747 if (ret < 0) {
1748 PERROR("Cannot mount debugfs");
1749 goto error;
1750 }
1751
1752 DBG("Mounted debugfs successfully at %s", path);
1753
1754 error:
1755 return ret;
1756 }
1757
1758 /*
1759 * Setup necessary data for kernel tracer action.
1760 */
1761 static void init_kernel_tracer(void)
1762 {
1763 int ret;
1764 char *proc_mounts = "/proc/mounts";
1765 char line[256];
1766 char *debugfs_path = NULL, *lttng_path = NULL;
1767 FILE *fp;
1768
1769 /* Detect debugfs */
1770 fp = fopen(proc_mounts, "r");
1771 if (fp == NULL) {
1772 ERR("Unable to probe %s", proc_mounts);
1773 goto error;
1774 }
1775
1776 while (fgets(line, sizeof(line), fp) != NULL) {
1777 if (strstr(line, "debugfs") != NULL) {
1778 /* Remove first string */
1779 strtok(line, " ");
1780 /* Dup string here so we can reuse line later on */
1781 debugfs_path = strdup(strtok(NULL, " "));
1782 DBG("Got debugfs path : %s", debugfs_path);
1783 break;
1784 }
1785 }
1786
1787 fclose(fp);
1788
1789 /* Mount debugfs if needded */
1790 if (debugfs_path == NULL) {
1791 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1792 if (ret < 0) {
1793 perror("asprintf debugfs path");
1794 goto error;
1795 }
1796 ret = mount_debugfs(debugfs_path);
1797 if (ret < 0) {
1798 perror("Cannot mount debugfs");
1799 goto error;
1800 }
1801 }
1802
1803 /* Modprobe lttng kernel modules */
1804 ret = modprobe_kernel_modules();
1805 if (ret < 0) {
1806 goto error;
1807 }
1808
1809 /* Setup lttng kernel path */
1810 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1811 if (ret < 0) {
1812 perror("asprintf lttng path");
1813 goto error;
1814 }
1815
1816 /* Open debugfs lttng */
1817 kernel_tracer_fd = open(lttng_path, O_RDWR);
1818 if (kernel_tracer_fd < 0) {
1819 DBG("Failed to open %s", lttng_path);
1820 goto error;
1821 }
1822
1823 free(lttng_path);
1824 free(debugfs_path);
1825 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1826 return;
1827
1828 error:
1829 if (lttng_path) {
1830 free(lttng_path);
1831 }
1832 if (debugfs_path) {
1833 free(debugfs_path);
1834 }
1835 WARN("No kernel tracer available");
1836 kernel_tracer_fd = 0;
1837 return;
1838 }
1839
1840 /*
1841 * Init tracing by creating trace directory and sending fds kernel consumer.
1842 */
1843 static int init_kernel_tracing(struct ltt_kernel_session *session)
1844 {
1845 int ret = 0;
1846
1847 if (session->consumer_fds_sent == 0) {
1848 /*
1849 * Assign default kernel consumer socket if no consumer assigned to the
1850 * kernel session. At this point, it's NOT suppose to be 0 but this is
1851 * an extra security check.
1852 */
1853 if (session->consumer_fd == 0) {
1854 session->consumer_fd = kconsumer_data.cmd_sock;
1855 }
1856
1857 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1858 if (ret < 0) {
1859 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1860 goto error;
1861 }
1862
1863 session->consumer_fds_sent = 1;
1864 }
1865
1866 error:
1867 return ret;
1868 }
1869
1870 /*
1871 * Create an UST session and add it to the session ust list.
1872 */
1873 static int create_ust_session(struct ltt_session *session,
1874 struct lttng_domain *domain)
1875 {
1876 int ret;
1877 unsigned int uid;
1878 struct ltt_ust_session *lus = NULL;
1879
1880 switch (domain->type) {
1881 case LTTNG_DOMAIN_UST:
1882 break;
1883 default:
1884 ret = LTTCOMM_UNKNOWN_DOMAIN;
1885 goto error;
1886 }
1887
1888 DBG("Creating UST session");
1889
1890 uid = session->uid;
1891 lus = trace_ust_create_session(session->path, uid, domain);
1892 if (lus == NULL) {
1893 ret = LTTCOMM_UST_SESS_FAIL;
1894 goto error;
1895 }
1896
1897 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1898 geteuid(), allowed_group());
1899 if (ret < 0) {
1900 if (ret != -EEXIST) {
1901 ERR("Trace directory creation error");
1902 ret = LTTCOMM_UST_SESS_FAIL;
1903 goto error;
1904 }
1905 }
1906
1907 /* The domain type dictate different actions on session creation */
1908 switch (domain->type) {
1909 case LTTNG_DOMAIN_UST:
1910 /* No ustctl for the global UST domain */
1911 break;
1912 default:
1913 ERR("Unknown UST domain on create session %d", domain->type);
1914 goto error;
1915 }
1916 session->ust_session = lus;
1917
1918 return LTTCOMM_OK;
1919
1920 error:
1921 free(lus);
1922 return ret;
1923 }
1924
1925 /*
1926 * Create a kernel tracer session then create the default channel.
1927 */
1928 static int create_kernel_session(struct ltt_session *session)
1929 {
1930 int ret;
1931
1932 DBG("Creating kernel session");
1933
1934 ret = kernel_create_session(session, kernel_tracer_fd);
1935 if (ret < 0) {
1936 ret = LTTCOMM_KERN_SESS_FAIL;
1937 goto error;
1938 }
1939
1940 /* Set kernel consumer socket fd */
1941 if (kconsumer_data.cmd_sock) {
1942 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1943 }
1944
1945 ret = mkdir_recursive(session->kernel_session->trace_path,
1946 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
1947 if (ret < 0) {
1948 if (ret != -EEXIST) {
1949 ERR("Trace directory creation error");
1950 goto error;
1951 }
1952 }
1953
1954 error:
1955 return ret;
1956 }
1957
1958 /*
1959 * Using the session list, filled a lttng_session array to send back to the
1960 * client for session listing.
1961 *
1962 * The session list lock MUST be acquired before calling this function. Use
1963 * session_lock_list() and session_unlock_list().
1964 */
1965 static void list_lttng_sessions(struct lttng_session *sessions)
1966 {
1967 int i = 0;
1968 struct ltt_session *session;
1969
1970 DBG("Getting all available session");
1971 /*
1972 * Iterate over session list and append data after the control struct in
1973 * the buffer.
1974 */
1975 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1976 strncpy(sessions[i].path, session->path, PATH_MAX);
1977 sessions[i].path[PATH_MAX - 1] = '\0';
1978 strncpy(sessions[i].name, session->name, NAME_MAX);
1979 sessions[i].name[NAME_MAX - 1] = '\0';
1980 sessions[i].enabled = session->enabled;
1981 i++;
1982 }
1983 }
1984
1985 /*
1986 * Fill lttng_channel array of all channels.
1987 */
1988 static void list_lttng_channels(int domain, struct ltt_session *session,
1989 struct lttng_channel *channels)
1990 {
1991 int i = 0;
1992 struct ltt_kernel_channel *kchan;
1993
1994 DBG("Listing channels for session %s", session->name);
1995
1996 switch (domain) {
1997 case LTTNG_DOMAIN_KERNEL:
1998 /* Kernel channels */
1999 if (session->kernel_session != NULL) {
2000 cds_list_for_each_entry(kchan,
2001 &session->kernel_session->channel_list.head, list) {
2002 /* Copy lttng_channel struct to array */
2003 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2004 channels[i].enabled = kchan->enabled;
2005 i++;
2006 }
2007 }
2008 break;
2009 case LTTNG_DOMAIN_UST:
2010 {
2011 struct cds_lfht_iter iter;
2012 struct ltt_ust_channel *uchan;
2013
2014 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2015 &iter, uchan, node) {
2016 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2017 channels[i].attr.overwrite = uchan->attr.overwrite;
2018 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2019 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2020 channels[i].attr.switch_timer_interval =
2021 uchan->attr.switch_timer_interval;
2022 channels[i].attr.read_timer_interval =
2023 uchan->attr.read_timer_interval;
2024 channels[i].enabled = uchan->enabled;
2025 switch (uchan->attr.output) {
2026 case LTTNG_UST_MMAP:
2027 default:
2028 channels[i].attr.output = LTTNG_EVENT_MMAP;
2029 break;
2030 }
2031 i++;
2032 }
2033 break;
2034 }
2035 default:
2036 break;
2037 }
2038 }
2039
2040 /*
2041 * Create a list of ust global domain events.
2042 */
2043 static int list_lttng_ust_global_events(char *channel_name,
2044 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2045 {
2046 int i = 0, ret = 0;
2047 unsigned int nb_event = 0;
2048 struct cds_lfht_iter iter;
2049 struct cds_lfht_node *node;
2050 struct ltt_ust_channel *uchan;
2051 struct ltt_ust_event *uevent;
2052 struct lttng_event *tmp;
2053
2054 DBG("Listing UST global events for channel %s", channel_name);
2055
2056 rcu_read_lock();
2057
2058 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2059 strlen(channel_name), &iter);
2060 if (node == NULL) {
2061 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2062 goto error;
2063 }
2064
2065 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2066
2067 nb_event += hashtable_get_count(uchan->events);
2068
2069 if (nb_event == 0) {
2070 ret = nb_event;
2071 goto error;
2072 }
2073
2074 DBG3("Listing UST global %d events", nb_event);
2075
2076 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2077 if (tmp == NULL) {
2078 ret = -LTTCOMM_FATAL;
2079 goto error;
2080 }
2081
2082 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2083 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2084 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2085 tmp[i].enabled = uevent->enabled;
2086 switch (uevent->attr.instrumentation) {
2087 case LTTNG_UST_TRACEPOINT:
2088 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2089 break;
2090 case LTTNG_UST_PROBE:
2091 tmp[i].type = LTTNG_EVENT_PROBE;
2092 break;
2093 case LTTNG_UST_FUNCTION:
2094 tmp[i].type = LTTNG_EVENT_FUNCTION;
2095 break;
2096 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2097 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2098 break;
2099 }
2100 i++;
2101 }
2102
2103 ret = nb_event;
2104 *events = tmp;
2105
2106 error:
2107 rcu_read_unlock();
2108 return ret;
2109 }
2110
2111 /*
2112 * Fill lttng_event array of all kernel events in the channel.
2113 */
2114 static int list_lttng_kernel_events(char *channel_name,
2115 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2116 {
2117 int i = 0, ret;
2118 unsigned int nb_event;
2119 struct ltt_kernel_event *event;
2120 struct ltt_kernel_channel *kchan;
2121
2122 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2123 if (kchan == NULL) {
2124 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2125 goto error;
2126 }
2127
2128 nb_event = kchan->event_count;
2129
2130 DBG("Listing events for channel %s", kchan->channel->name);
2131
2132 if (nb_event == 0) {
2133 ret = nb_event;
2134 goto error;
2135 }
2136
2137 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2138 if (*events == NULL) {
2139 ret = LTTCOMM_FATAL;
2140 goto error;
2141 }
2142
2143 /* Kernel channels */
2144 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2145 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2146 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2147 (*events)[i].enabled = event->enabled;
2148 switch (event->event->instrumentation) {
2149 case LTTNG_KERNEL_TRACEPOINT:
2150 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2151 break;
2152 case LTTNG_KERNEL_KPROBE:
2153 case LTTNG_KERNEL_KRETPROBE:
2154 (*events)[i].type = LTTNG_EVENT_PROBE;
2155 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2156 sizeof(struct lttng_kernel_kprobe));
2157 break;
2158 case LTTNG_KERNEL_FUNCTION:
2159 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2160 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2161 sizeof(struct lttng_kernel_function));
2162 break;
2163 case LTTNG_KERNEL_NOOP:
2164 (*events)[i].type = LTTNG_EVENT_NOOP;
2165 break;
2166 case LTTNG_KERNEL_SYSCALL:
2167 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2168 break;
2169 case LTTNG_KERNEL_ALL:
2170 assert(0);
2171 break;
2172 }
2173 i++;
2174 }
2175
2176 return nb_event;
2177
2178 error:
2179 return ret;
2180 }
2181
2182 /*
2183 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2184 */
2185 static int cmd_disable_channel(struct ltt_session *session,
2186 int domain, char *channel_name)
2187 {
2188 int ret;
2189 struct ltt_ust_session *usess;
2190
2191 usess = session->ust_session;
2192
2193 switch (domain) {
2194 case LTTNG_DOMAIN_KERNEL:
2195 {
2196 ret = channel_kernel_disable(session->kernel_session,
2197 channel_name);
2198 if (ret != LTTCOMM_OK) {
2199 goto error;
2200 }
2201
2202 kernel_wait_quiescent(kernel_tracer_fd);
2203 break;
2204 }
2205 case LTTNG_DOMAIN_UST:
2206 {
2207 struct ltt_ust_channel *uchan;
2208 struct cds_lfht *chan_ht;
2209
2210 chan_ht = usess->domain_global.channels;
2211
2212 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2213 if (uchan == NULL) {
2214 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2215 goto error;
2216 }
2217
2218 ret = channel_ust_disable(usess, domain, uchan);
2219 if (ret != LTTCOMM_OK) {
2220 goto error;
2221 }
2222 break;
2223 }
2224 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2225 case LTTNG_DOMAIN_UST_EXEC_NAME:
2226 case LTTNG_DOMAIN_UST_PID:
2227 ret = LTTCOMM_NOT_IMPLEMENTED;
2228 goto error;
2229 default:
2230 ret = LTTCOMM_UNKNOWN_DOMAIN;
2231 goto error;
2232 }
2233
2234 ret = LTTCOMM_OK;
2235
2236 error:
2237 return ret;
2238 }
2239
2240 /*
2241 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2242 */
2243 static int cmd_enable_channel(struct ltt_session *session,
2244 int domain, struct lttng_channel *attr)
2245 {
2246 int ret;
2247 struct ltt_ust_session *usess = session->ust_session;
2248 struct cds_lfht *chan_ht;
2249
2250 DBG("Enabling channel %s for session %s", attr->name, session->name);
2251
2252 switch (domain) {
2253 case LTTNG_DOMAIN_KERNEL:
2254 {
2255 struct ltt_kernel_channel *kchan;
2256
2257 kchan = trace_kernel_get_channel_by_name(attr->name,
2258 session->kernel_session);
2259 if (kchan == NULL) {
2260 ret = channel_kernel_create(session->kernel_session,
2261 attr, kernel_poll_pipe[1]);
2262 } else {
2263 ret = channel_kernel_enable(session->kernel_session, kchan);
2264 }
2265
2266 if (ret != LTTCOMM_OK) {
2267 goto error;
2268 }
2269
2270 kernel_wait_quiescent(kernel_tracer_fd);
2271 break;
2272 }
2273 case LTTNG_DOMAIN_UST:
2274 {
2275 struct ltt_ust_channel *uchan;
2276
2277 chan_ht = usess->domain_global.channels;
2278
2279 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2280 if (uchan == NULL) {
2281 ret = channel_ust_create(usess, domain, attr);
2282 } else {
2283 ret = channel_ust_enable(usess, domain, uchan);
2284 }
2285 break;
2286 }
2287 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2288 case LTTNG_DOMAIN_UST_EXEC_NAME:
2289 case LTTNG_DOMAIN_UST_PID:
2290 ret = LTTCOMM_NOT_IMPLEMENTED;
2291 goto error;
2292 default:
2293 ret = LTTCOMM_UNKNOWN_DOMAIN;
2294 goto error;
2295 }
2296
2297 error:
2298 return ret;
2299 }
2300
2301 /*
2302 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2303 */
2304 static int cmd_disable_event(struct ltt_session *session, int domain,
2305 char *channel_name, char *event_name)
2306 {
2307 int ret;
2308
2309 switch (domain) {
2310 case LTTNG_DOMAIN_KERNEL:
2311 {
2312 struct ltt_kernel_channel *kchan;
2313 struct ltt_kernel_session *ksess;
2314
2315 ksess = session->kernel_session;
2316
2317 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2318 if (kchan == NULL) {
2319 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2320 goto error;
2321 }
2322
2323 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2324 if (ret != LTTCOMM_OK) {
2325 goto error;
2326 }
2327
2328 kernel_wait_quiescent(kernel_tracer_fd);
2329 break;
2330 }
2331 case LTTNG_DOMAIN_UST:
2332 {
2333 struct ltt_ust_channel *uchan;
2334 struct ltt_ust_session *usess;
2335
2336 usess = session->ust_session;
2337
2338 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2339 channel_name);
2340 if (uchan == NULL) {
2341 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2342 goto error;
2343 }
2344
2345 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2346 if (ret != LTTCOMM_OK) {
2347 goto error;
2348 }
2349
2350 DBG3("Disable UST event %s in channel %s completed", event_name,
2351 channel_name);
2352 break;
2353 }
2354 case LTTNG_DOMAIN_UST_EXEC_NAME:
2355 case LTTNG_DOMAIN_UST_PID:
2356 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2357 default:
2358 ret = LTTCOMM_NOT_IMPLEMENTED;
2359 goto error;
2360 }
2361
2362 ret = LTTCOMM_OK;
2363
2364 error:
2365 return ret;
2366 }
2367
2368 /*
2369 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2370 */
2371 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2372 char *channel_name)
2373 {
2374 int ret;
2375
2376 switch (domain) {
2377 case LTTNG_DOMAIN_KERNEL:
2378 {
2379 struct ltt_kernel_session *ksess;
2380 struct ltt_kernel_channel *kchan;
2381
2382 ksess = session->kernel_session;
2383
2384 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2385 if (kchan == NULL) {
2386 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2387 goto error;
2388 }
2389
2390 ret = event_kernel_disable_all(ksess, kchan);
2391 if (ret != LTTCOMM_OK) {
2392 goto error;
2393 }
2394
2395 kernel_wait_quiescent(kernel_tracer_fd);
2396 break;
2397 }
2398 case LTTNG_DOMAIN_UST:
2399 {
2400 struct ltt_ust_session *usess;
2401 struct ltt_ust_channel *uchan;
2402
2403 usess = session->ust_session;
2404
2405 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2406 channel_name);
2407 if (uchan == NULL) {
2408 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2409 goto error;
2410 }
2411
2412 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2413 if (ret != 0) {
2414 goto error;
2415 }
2416
2417 DBG3("Disable all UST events in channel %s completed", channel_name);
2418
2419 break;
2420 }
2421 case LTTNG_DOMAIN_UST_EXEC_NAME:
2422 case LTTNG_DOMAIN_UST_PID:
2423 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2424 default:
2425 ret = LTTCOMM_NOT_IMPLEMENTED;
2426 goto error;
2427 }
2428
2429 ret = LTTCOMM_OK;
2430
2431 error:
2432 return ret;
2433 }
2434
2435 /*
2436 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2437 */
2438 static int cmd_add_context(struct ltt_session *session, int domain,
2439 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2440 {
2441 int ret;
2442
2443 switch (domain) {
2444 case LTTNG_DOMAIN_KERNEL:
2445 /* Add kernel context to kernel tracer */
2446 ret = context_kernel_add(session->kernel_session, ctx,
2447 event_name, channel_name);
2448 if (ret != LTTCOMM_OK) {
2449 goto error;
2450 }
2451 break;
2452 case LTTNG_DOMAIN_UST:
2453 {
2454 struct ltt_ust_session *usess = session->ust_session;
2455
2456 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2457 if (ret != LTTCOMM_OK) {
2458 goto error;
2459 }
2460 break;
2461 }
2462 case LTTNG_DOMAIN_UST_EXEC_NAME:
2463 case LTTNG_DOMAIN_UST_PID:
2464 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2465 default:
2466 ret = LTTCOMM_NOT_IMPLEMENTED;
2467 goto error;
2468 }
2469
2470 ret = LTTCOMM_OK;
2471
2472 error:
2473 return ret;
2474 }
2475
2476 /*
2477 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2478 *
2479 * TODO: currently, both events and loglevels are kept within the same
2480 * namespace for UST global registry/app registery, so if an event
2481 * happen to have the same name as the loglevel (very unlikely though),
2482 * and an attempt is made to enable/disable both in the same session,
2483 * the first to be created will be the only one allowed to exist.
2484 */
2485 static int cmd_enable_event(struct ltt_session *session, int domain,
2486 char *channel_name, struct lttng_event *event)
2487 {
2488 int ret;
2489 struct lttng_channel *attr;
2490 struct ltt_ust_session *usess = session->ust_session;
2491
2492 switch (domain) {
2493 case LTTNG_DOMAIN_KERNEL:
2494 {
2495 struct ltt_kernel_channel *kchan;
2496
2497 kchan = trace_kernel_get_channel_by_name(channel_name,
2498 session->kernel_session);
2499 if (kchan == NULL) {
2500 attr = channel_new_default_attr(domain);
2501 if (attr == NULL) {
2502 ret = LTTCOMM_FATAL;
2503 goto error;
2504 }
2505 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2506
2507 /* This call will notify the kernel thread */
2508 ret = channel_kernel_create(session->kernel_session,
2509 attr, kernel_poll_pipe[1]);
2510 if (ret != LTTCOMM_OK) {
2511 free(attr);
2512 goto error;
2513 }
2514 free(attr);
2515 }
2516
2517 /* Get the newly created kernel channel pointer */
2518 kchan = trace_kernel_get_channel_by_name(channel_name,
2519 session->kernel_session);
2520 if (kchan == NULL) {
2521 /* This sould not happen... */
2522 ret = LTTCOMM_FATAL;
2523 goto error;
2524 }
2525
2526 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2527 event);
2528 if (ret != LTTCOMM_OK) {
2529 goto error;
2530 }
2531
2532 kernel_wait_quiescent(kernel_tracer_fd);
2533 break;
2534 }
2535 case LTTNG_DOMAIN_UST:
2536 {
2537 struct lttng_channel *attr;
2538 struct ltt_ust_channel *uchan;
2539
2540 /* Get channel from global UST domain */
2541 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2542 channel_name);
2543 if (uchan == NULL) {
2544 /* Create default channel */
2545 attr = channel_new_default_attr(domain);
2546 if (attr == NULL) {
2547 ret = LTTCOMM_FATAL;
2548 goto error;
2549 }
2550 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2551 attr->name[NAME_MAX - 1] = '\0';
2552
2553 ret = channel_ust_create(usess, domain, attr);
2554 if (ret != LTTCOMM_OK) {
2555 free(attr);
2556 goto error;
2557 }
2558 free(attr);
2559
2560 /* Get the newly created channel reference back */
2561 uchan = trace_ust_find_channel_by_name(
2562 usess->domain_global.channels, channel_name);
2563 if (uchan == NULL) {
2564 /* Something is really wrong */
2565 ret = LTTCOMM_FATAL;
2566 goto error;
2567 }
2568 }
2569
2570 /* At this point, the session and channel exist on the tracer */
2571
2572 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2573 if (ret != LTTCOMM_OK) {
2574 goto error;
2575 }
2576 break;
2577 }
2578 case LTTNG_DOMAIN_UST_EXEC_NAME:
2579 case LTTNG_DOMAIN_UST_PID:
2580 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2581 default:
2582 ret = LTTCOMM_NOT_IMPLEMENTED;
2583 goto error;
2584 }
2585
2586 ret = LTTCOMM_OK;
2587
2588 error:
2589 return ret;
2590 }
2591
2592 /*
2593 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2594 */
2595 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2596 char *channel_name, int event_type)
2597 {
2598 int ret;
2599 struct ltt_kernel_channel *kchan;
2600
2601 switch (domain) {
2602 case LTTNG_DOMAIN_KERNEL:
2603 kchan = trace_kernel_get_channel_by_name(channel_name,
2604 session->kernel_session);
2605 if (kchan == NULL) {
2606 /* This call will notify the kernel thread */
2607 ret = channel_kernel_create(session->kernel_session, NULL,
2608 kernel_poll_pipe[1]);
2609 if (ret != LTTCOMM_OK) {
2610 goto error;
2611 }
2612
2613 /* Get the newly created kernel channel pointer */
2614 kchan = trace_kernel_get_channel_by_name(channel_name,
2615 session->kernel_session);
2616 if (kchan == NULL) {
2617 /* This sould not happen... */
2618 ret = LTTCOMM_FATAL;
2619 goto error;
2620 }
2621
2622 }
2623
2624 switch (event_type) {
2625 case LTTNG_EVENT_SYSCALL:
2626 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2627 kchan, kernel_tracer_fd);
2628 break;
2629 case LTTNG_EVENT_TRACEPOINT:
2630 /*
2631 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2632 * events already registered to the channel.
2633 */
2634 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2635 kchan, kernel_tracer_fd);
2636 break;
2637 case LTTNG_EVENT_ALL:
2638 /* Enable syscalls and tracepoints */
2639 ret = event_kernel_enable_all(session->kernel_session,
2640 kchan, kernel_tracer_fd);
2641 break;
2642 default:
2643 ret = LTTCOMM_KERN_ENABLE_FAIL;
2644 goto error;
2645 }
2646
2647 /* Manage return value */
2648 if (ret != LTTCOMM_OK) {
2649 goto error;
2650 }
2651
2652 kernel_wait_quiescent(kernel_tracer_fd);
2653 break;
2654 case LTTNG_DOMAIN_UST:
2655 {
2656 struct lttng_channel *attr;
2657 struct ltt_ust_channel *uchan;
2658 struct ltt_ust_session *usess = session->ust_session;
2659
2660 /* Get channel from global UST domain */
2661 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2662 channel_name);
2663 if (uchan == NULL) {
2664 /* Create default channel */
2665 attr = channel_new_default_attr(domain);
2666 if (attr == NULL) {
2667 ret = LTTCOMM_FATAL;
2668 goto error;
2669 }
2670 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2671 attr->name[NAME_MAX - 1] = '\0';
2672
2673 /* Use the internal command enable channel */
2674 ret = channel_ust_create(usess, domain, attr);
2675 if (ret != LTTCOMM_OK) {
2676 free(attr);
2677 goto error;
2678 }
2679 free(attr);
2680
2681 /* Get the newly created channel reference back */
2682 uchan = trace_ust_find_channel_by_name(
2683 usess->domain_global.channels, channel_name);
2684 if (uchan == NULL) {
2685 /* Something is really wrong */
2686 ret = LTTCOMM_FATAL;
2687 goto error;
2688 }
2689 }
2690
2691 /* At this point, the session and channel exist on the tracer */
2692
2693 switch (event_type) {
2694 case LTTNG_EVENT_ALL:
2695 case LTTNG_EVENT_TRACEPOINT:
2696 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2697 if (ret != LTTCOMM_OK) {
2698 goto error;
2699 }
2700 break;
2701 default:
2702 ret = LTTCOMM_UST_ENABLE_FAIL;
2703 goto error;
2704 }
2705
2706 /* Manage return value */
2707 if (ret != LTTCOMM_OK) {
2708 goto error;
2709 }
2710
2711 break;
2712 }
2713 case LTTNG_DOMAIN_UST_EXEC_NAME:
2714 case LTTNG_DOMAIN_UST_PID:
2715 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2716 default:
2717 ret = LTTCOMM_NOT_IMPLEMENTED;
2718 goto error;
2719 }
2720
2721 ret = LTTCOMM_OK;
2722
2723 error:
2724 return ret;
2725 }
2726
2727 /*
2728 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2729 */
2730 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2731 {
2732 int ret;
2733 ssize_t nb_events = 0;
2734
2735 switch (domain) {
2736 case LTTNG_DOMAIN_KERNEL:
2737 nb_events = kernel_list_events(kernel_tracer_fd, events);
2738 if (nb_events < 0) {
2739 ret = LTTCOMM_KERN_LIST_FAIL;
2740 goto error;
2741 }
2742 break;
2743 case LTTNG_DOMAIN_UST:
2744 nb_events = ust_app_list_events(events);
2745 if (nb_events < 0) {
2746 ret = LTTCOMM_UST_LIST_FAIL;
2747 goto error;
2748 }
2749 break;
2750 default:
2751 ret = LTTCOMM_NOT_IMPLEMENTED;
2752 goto error;
2753 }
2754
2755 return nb_events;
2756
2757 error:
2758 /* Return negative value to differentiate return code */
2759 return -ret;
2760 }
2761
2762 /*
2763 * Command LTTNG_START_TRACE processed by the client thread.
2764 */
2765 static int cmd_start_trace(struct ltt_session *session)
2766 {
2767 int ret;
2768 struct ltt_kernel_session *ksession;
2769 struct ltt_ust_session *usess;
2770
2771 /* Short cut */
2772 ksession = session->kernel_session;
2773 usess = session->ust_session;
2774
2775 if (session->enabled) {
2776 ret = LTTCOMM_UST_START_FAIL;
2777 goto error;
2778 }
2779
2780 session->enabled = 1;
2781
2782 /* Kernel tracing */
2783 if (ksession != NULL) {
2784 struct ltt_kernel_channel *kchan;
2785
2786 /* Open kernel metadata */
2787 if (ksession->metadata == NULL) {
2788 ret = kernel_open_metadata(ksession, ksession->trace_path);
2789 if (ret < 0) {
2790 ret = LTTCOMM_KERN_META_FAIL;
2791 goto error;
2792 }
2793 }
2794
2795 /* Open kernel metadata stream */
2796 if (ksession->metadata_stream_fd == 0) {
2797 ret = kernel_open_metadata_stream(ksession);
2798 if (ret < 0) {
2799 ERR("Kernel create metadata stream failed");
2800 ret = LTTCOMM_KERN_STREAM_FAIL;
2801 goto error;
2802 }
2803 }
2804
2805 /* For each channel */
2806 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2807 if (kchan->stream_count == 0) {
2808 ret = kernel_open_channel_stream(kchan);
2809 if (ret < 0) {
2810 ret = LTTCOMM_KERN_STREAM_FAIL;
2811 goto error;
2812 }
2813 /* Update the stream global counter */
2814 ksession->stream_count_global += ret;
2815 }
2816 }
2817
2818 /* Setup kernel consumer socket and send fds to it */
2819 ret = init_kernel_tracing(ksession);
2820 if (ret < 0) {
2821 ret = LTTCOMM_KERN_START_FAIL;
2822 goto error;
2823 }
2824
2825 /* This start the kernel tracing */
2826 ret = kernel_start_session(ksession);
2827 if (ret < 0) {
2828 ret = LTTCOMM_KERN_START_FAIL;
2829 goto error;
2830 }
2831
2832 /* Quiescent wait after starting trace */
2833 kernel_wait_quiescent(kernel_tracer_fd);
2834 }
2835
2836 /* Flag session that trace should start automatically */
2837 if (usess) {
2838 usess->start_trace = 1;
2839
2840 ret = ust_app_start_trace_all(usess);
2841 if (ret < 0) {
2842 ret = LTTCOMM_UST_START_FAIL;
2843 goto error;
2844 }
2845 }
2846
2847 ret = LTTCOMM_OK;
2848
2849 error:
2850 return ret;
2851 }
2852
2853 /*
2854 * Command LTTNG_STOP_TRACE processed by the client thread.
2855 */
2856 static int cmd_stop_trace(struct ltt_session *session)
2857 {
2858 int ret;
2859 struct ltt_kernel_channel *kchan;
2860 struct ltt_kernel_session *ksession;
2861 struct ltt_ust_session *usess;
2862
2863 /* Short cut */
2864 ksession = session->kernel_session;
2865 usess = session->ust_session;
2866
2867 if (!session->enabled) {
2868 ret = LTTCOMM_UST_START_FAIL;
2869 goto error;
2870 }
2871
2872 session->enabled = 0;
2873
2874 /* Kernel tracer */
2875 if (ksession != NULL) {
2876 DBG("Stop kernel tracing");
2877
2878 /* Flush all buffers before stopping */
2879 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2880 if (ret < 0) {
2881 ERR("Kernel metadata flush failed");
2882 }
2883
2884 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2885 ret = kernel_flush_buffer(kchan);
2886 if (ret < 0) {
2887 ERR("Kernel flush buffer error");
2888 }
2889 }
2890
2891 ret = kernel_stop_session(ksession);
2892 if (ret < 0) {
2893 ret = LTTCOMM_KERN_STOP_FAIL;
2894 goto error;
2895 }
2896
2897 kernel_wait_quiescent(kernel_tracer_fd);
2898 }
2899
2900 if (usess) {
2901 usess->start_trace = 0;
2902
2903 ret = ust_app_stop_trace_all(usess);
2904 if (ret < 0) {
2905 ret = LTTCOMM_UST_START_FAIL;
2906 goto error;
2907 }
2908 }
2909
2910 ret = LTTCOMM_OK;
2911
2912 error:
2913 return ret;
2914 }
2915
2916 /*
2917 * Command LTTNG_CREATE_SESSION processed by the client thread.
2918 */
2919 static int cmd_create_session(char *name, char *path)
2920 {
2921 int ret;
2922
2923 ret = session_create(name, path);
2924 if (ret != LTTCOMM_OK) {
2925 goto error;
2926 }
2927
2928 ret = LTTCOMM_OK;
2929
2930 error:
2931 return ret;
2932 }
2933
2934 /*
2935 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2936 */
2937 static int cmd_destroy_session(struct ltt_session *session, char *name)
2938 {
2939 int ret;
2940
2941 /* Clean kernel session teardown */
2942 teardown_kernel_session(session);
2943 /* UST session teardown */
2944 teardown_ust_session(session);
2945
2946 /*
2947 * Must notify the kernel thread here to update it's poll setin order
2948 * to remove the channel(s)' fd just destroyed.
2949 */
2950 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2951 if (ret < 0) {
2952 perror("write kernel poll pipe");
2953 }
2954
2955 ret = session_destroy(session);
2956
2957 return ret;
2958 }
2959
2960 /*
2961 * Command LTTNG_CALIBRATE processed by the client thread.
2962 */
2963 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2964 {
2965 int ret;
2966
2967 switch (domain) {
2968 case LTTNG_DOMAIN_KERNEL:
2969 {
2970 struct lttng_kernel_calibrate kcalibrate;
2971
2972 kcalibrate.type = calibrate->type;
2973 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2974 if (ret < 0) {
2975 ret = LTTCOMM_KERN_ENABLE_FAIL;
2976 goto error;
2977 }
2978 break;
2979 }
2980 default:
2981 /* TODO: Userspace tracing */
2982 ret = LTTCOMM_NOT_IMPLEMENTED;
2983 goto error;
2984 }
2985
2986 ret = LTTCOMM_OK;
2987
2988 error:
2989 return ret;
2990 }
2991
2992 /*
2993 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2994 */
2995 static int cmd_register_consumer(struct ltt_session *session, int domain,
2996 char *sock_path)
2997 {
2998 int ret, sock;
2999
3000 switch (domain) {
3001 case LTTNG_DOMAIN_KERNEL:
3002 /* Can't register a consumer if there is already one */
3003 if (session->kernel_session->consumer_fds_sent != 0) {
3004 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3005 goto error;
3006 }
3007
3008 sock = lttcomm_connect_unix_sock(sock_path);
3009 if (sock < 0) {
3010 ret = LTTCOMM_CONNECT_FAIL;
3011 goto error;
3012 }
3013
3014 session->kernel_session->consumer_fd = sock;
3015 break;
3016 default:
3017 /* TODO: Userspace tracing */
3018 ret = LTTCOMM_NOT_IMPLEMENTED;
3019 goto error;
3020 }
3021
3022 ret = LTTCOMM_OK;
3023
3024 error:
3025 return ret;
3026 }
3027
3028 /*
3029 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3030 */
3031 static ssize_t cmd_list_domains(struct ltt_session *session,
3032 struct lttng_domain **domains)
3033 {
3034 int ret, index = 0;
3035 ssize_t nb_dom = 0;
3036
3037 if (session->kernel_session != NULL) {
3038 DBG3("Listing domains found kernel domain");
3039 nb_dom++;
3040 }
3041
3042 if (session->ust_session != NULL) {
3043 DBG3("Listing domains found UST global domain");
3044 nb_dom++;
3045 }
3046
3047 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3048 if (*domains == NULL) {
3049 ret = -LTTCOMM_FATAL;
3050 goto error;
3051 }
3052
3053 if (session->kernel_session != NULL) {
3054 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3055 index++;
3056 }
3057
3058 if (session->ust_session != NULL) {
3059 (*domains)[index].type = LTTNG_DOMAIN_UST;
3060 index++;
3061 }
3062
3063 return nb_dom;
3064
3065 error:
3066 return ret;
3067 }
3068
3069 /*
3070 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3071 */
3072 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3073 struct lttng_channel **channels)
3074 {
3075 int ret;
3076 ssize_t nb_chan = 0;
3077
3078 switch (domain) {
3079 case LTTNG_DOMAIN_KERNEL:
3080 if (session->kernel_session != NULL) {
3081 nb_chan = session->kernel_session->channel_count;
3082 }
3083 DBG3("Number of kernel channels %zd", nb_chan);
3084 break;
3085 case LTTNG_DOMAIN_UST:
3086 if (session->ust_session != NULL) {
3087 nb_chan = hashtable_get_count(
3088 session->ust_session->domain_global.channels);
3089 }
3090 DBG3("Number of UST global channels %zd", nb_chan);
3091 break;
3092 default:
3093 *channels = NULL;
3094 ret = -LTTCOMM_NOT_IMPLEMENTED;
3095 goto error;
3096 }
3097
3098 if (nb_chan > 0) {
3099 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3100 if (*channels == NULL) {
3101 ret = -LTTCOMM_FATAL;
3102 goto error;
3103 }
3104
3105 list_lttng_channels(domain, session, *channels);
3106 } else {
3107 *channels = NULL;
3108 }
3109
3110 return nb_chan;
3111
3112 error:
3113 return ret;
3114 }
3115
3116 /*
3117 * Command LTTNG_LIST_EVENTS processed by the client thread.
3118 */
3119 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3120 char *channel_name, struct lttng_event **events)
3121 {
3122 int ret = 0;
3123 ssize_t nb_event = 0;
3124
3125 switch (domain) {
3126 case LTTNG_DOMAIN_KERNEL:
3127 if (session->kernel_session != NULL) {
3128 nb_event = list_lttng_kernel_events(channel_name,
3129 session->kernel_session, events);
3130 }
3131 break;
3132 case LTTNG_DOMAIN_UST:
3133 {
3134 if (session->ust_session != NULL) {
3135 nb_event = list_lttng_ust_global_events(channel_name,
3136 &session->ust_session->domain_global, events);
3137 }
3138 break;
3139 }
3140 default:
3141 ret = -LTTCOMM_NOT_IMPLEMENTED;
3142 goto error;
3143 }
3144
3145 ret = nb_event;
3146
3147 error:
3148 return ret;
3149 }
3150
3151 /*
3152 * Process the command requested by the lttng client within the command
3153 * context structure. This function make sure that the return structure (llm)
3154 * is set and ready for transmission before returning.
3155 *
3156 * Return any error encountered or 0 for success.
3157 */
3158 static int process_client_msg(struct command_ctx *cmd_ctx)
3159 {
3160 int ret = LTTCOMM_OK;
3161 int need_tracing_session = 1;
3162
3163 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3164
3165 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3166 ret = LTTCOMM_KERN_NA;
3167 goto error;
3168 }
3169
3170 /*
3171 * Check for command that don't needs to allocate a returned payload. We do
3172 * this here so we don't have to make the call for no payload at each
3173 * command.
3174 */
3175 switch(cmd_ctx->lsm->cmd_type) {
3176 case LTTNG_LIST_SESSIONS:
3177 case LTTNG_LIST_TRACEPOINTS:
3178 case LTTNG_LIST_DOMAINS:
3179 case LTTNG_LIST_CHANNELS:
3180 case LTTNG_LIST_EVENTS:
3181 break;
3182 default:
3183 /* Setup lttng message with no payload */
3184 ret = setup_lttng_msg(cmd_ctx, 0);
3185 if (ret < 0) {
3186 /* This label does not try to unlock the session */
3187 goto init_setup_error;
3188 }
3189 }
3190
3191 /* Commands that DO NOT need a session. */
3192 switch (cmd_ctx->lsm->cmd_type) {
3193 case LTTNG_CALIBRATE:
3194 case LTTNG_CREATE_SESSION:
3195 case LTTNG_LIST_SESSIONS:
3196 case LTTNG_LIST_TRACEPOINTS:
3197 need_tracing_session = 0;
3198 break;
3199 default:
3200 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3201 session_lock_list();
3202 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3203 session_unlock_list();
3204 if (cmd_ctx->session == NULL) {
3205 if (cmd_ctx->lsm->session.name != NULL) {
3206 ret = LTTCOMM_SESS_NOT_FOUND;
3207 } else {
3208 /* If no session name specified */
3209 ret = LTTCOMM_SELECT_SESS;
3210 }
3211 goto error;
3212 } else {
3213 /* Acquire lock for the session */
3214 session_lock(cmd_ctx->session);
3215 }
3216 break;
3217 }
3218
3219 /*
3220 * Check domain type for specific "pre-action".
3221 */
3222 switch (cmd_ctx->lsm->domain.type) {
3223 case LTTNG_DOMAIN_KERNEL:
3224 /* Kernel tracer check */
3225 if (kernel_tracer_fd == 0) {
3226 /* Basically, load kernel tracer modules */
3227 init_kernel_tracer();
3228 if (kernel_tracer_fd == 0) {
3229 ret = LTTCOMM_KERN_NA;
3230 goto error;
3231 }
3232 }
3233
3234 /* Need a session for kernel command */
3235 if (need_tracing_session) {
3236 if (cmd_ctx->session->kernel_session == NULL) {
3237 ret = create_kernel_session(cmd_ctx->session);
3238 if (ret < 0) {
3239 ret = LTTCOMM_KERN_SESS_FAIL;
3240 goto error;
3241 }
3242 }
3243
3244 /* Start the kernel consumer daemon */
3245 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3246 if (kconsumer_data.pid == 0 &&
3247 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3248 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3249 ret = start_consumerd(&kconsumer_data);
3250 if (ret < 0) {
3251 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3252 goto error;
3253 }
3254 } else {
3255 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3256 }
3257 }
3258 break;
3259 case LTTNG_DOMAIN_UST:
3260 {
3261 if (need_tracing_session) {
3262 if (cmd_ctx->session->ust_session == NULL) {
3263 ret = create_ust_session(cmd_ctx->session,
3264 &cmd_ctx->lsm->domain);
3265 if (ret != LTTCOMM_OK) {
3266 goto error;
3267 }
3268 }
3269 /* Start the UST consumer daemons */
3270 /* 64-bit */
3271 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3272 if (consumerd64_bin[0] != '\0' &&
3273 ustconsumer64_data.pid == 0 &&
3274 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3275 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3276 ret = start_consumerd(&ustconsumer64_data);
3277 if (ret < 0) {
3278 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3279 ust_consumerd64_fd = -EINVAL;
3280 goto error;
3281 }
3282
3283 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3284 } else {
3285 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3286 }
3287 /* 32-bit */
3288 if (consumerd32_bin[0] != '\0' &&
3289 ustconsumer32_data.pid == 0 &&
3290 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3291 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3292 ret = start_consumerd(&ustconsumer32_data);
3293 if (ret < 0) {
3294 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3295 ust_consumerd32_fd = -EINVAL;
3296 goto error;
3297 }
3298 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3299 } else {
3300 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3301 }
3302 }
3303 break;
3304 }
3305 default:
3306 break;
3307 }
3308
3309 /* Process by command type */
3310 switch (cmd_ctx->lsm->cmd_type) {
3311 case LTTNG_ADD_CONTEXT:
3312 {
3313 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3314 cmd_ctx->lsm->u.context.channel_name,
3315 cmd_ctx->lsm->u.context.event_name,
3316 &cmd_ctx->lsm->u.context.ctx);
3317 break;
3318 }
3319 case LTTNG_DISABLE_CHANNEL:
3320 {
3321 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3322 cmd_ctx->lsm->u.disable.channel_name);
3323 break;
3324 }
3325 case LTTNG_DISABLE_EVENT:
3326 {
3327 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3328 cmd_ctx->lsm->u.disable.channel_name,
3329 cmd_ctx->lsm->u.disable.name);
3330 ret = LTTCOMM_OK;
3331 break;
3332 }
3333 case LTTNG_DISABLE_ALL_EVENT:
3334 {
3335 DBG("Disabling all events");
3336
3337 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3338 cmd_ctx->lsm->u.disable.channel_name);
3339 break;
3340 }
3341 case LTTNG_ENABLE_CHANNEL:
3342 {
3343 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3344 &cmd_ctx->lsm->u.channel.chan);
3345 break;
3346 }
3347 case LTTNG_ENABLE_EVENT:
3348 {
3349 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3350 cmd_ctx->lsm->u.enable.channel_name,
3351 &cmd_ctx->lsm->u.enable.event);
3352 break;
3353 }
3354 case LTTNG_ENABLE_ALL_EVENT:
3355 {
3356 DBG("Enabling all events");
3357
3358 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3359 cmd_ctx->lsm->u.enable.channel_name,
3360 cmd_ctx->lsm->u.enable.event.type);
3361 break;
3362 }
3363 case LTTNG_LIST_TRACEPOINTS:
3364 {
3365 struct lttng_event *events;
3366 ssize_t nb_events;
3367
3368 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3369 if (nb_events < 0) {
3370 ret = -nb_events;
3371 goto error;
3372 }
3373
3374 /*
3375 * Setup lttng message with payload size set to the event list size in
3376 * bytes and then copy list into the llm payload.
3377 */
3378 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3379 if (ret < 0) {
3380 free(events);
3381 goto setup_error;
3382 }
3383
3384 /* Copy event list into message payload */
3385 memcpy(cmd_ctx->llm->payload, events,
3386 sizeof(struct lttng_event) * nb_events);
3387
3388 free(events);
3389
3390 ret = LTTCOMM_OK;
3391 break;
3392 }
3393 case LTTNG_START_TRACE:
3394 {
3395 ret = cmd_start_trace(cmd_ctx->session);
3396 break;
3397 }
3398 case LTTNG_STOP_TRACE:
3399 {
3400 ret = cmd_stop_trace(cmd_ctx->session);
3401 break;
3402 }
3403 case LTTNG_CREATE_SESSION:
3404 {
3405 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3406 cmd_ctx->lsm->session.path);
3407 break;
3408 }
3409 case LTTNG_DESTROY_SESSION:
3410 {
3411 ret = cmd_destroy_session(cmd_ctx->session,
3412 cmd_ctx->lsm->session.name);
3413 break;
3414 }
3415 case LTTNG_LIST_DOMAINS:
3416 {
3417 ssize_t nb_dom;
3418 struct lttng_domain *domains;
3419
3420 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3421 if (nb_dom < 0) {
3422 ret = -nb_dom;
3423 goto error;
3424 }
3425
3426 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3427 if (ret < 0) {
3428 goto setup_error;
3429 }
3430
3431 /* Copy event list into message payload */
3432 memcpy(cmd_ctx->llm->payload, domains,
3433 nb_dom * sizeof(struct lttng_domain));
3434
3435 free(domains);
3436
3437 ret = LTTCOMM_OK;
3438 break;
3439 }
3440 case LTTNG_LIST_CHANNELS:
3441 {
3442 size_t nb_chan;
3443 struct lttng_channel *channels;
3444
3445 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3446 cmd_ctx->session, &channels);
3447 if (nb_chan < 0) {
3448 ret = -nb_chan;
3449 goto error;
3450 }
3451
3452 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3453 if (ret < 0) {
3454 goto setup_error;
3455 }
3456
3457 /* Copy event list into message payload */
3458 memcpy(cmd_ctx->llm->payload, channels,
3459 nb_chan * sizeof(struct lttng_channel));
3460
3461 free(channels);
3462
3463 ret = LTTCOMM_OK;
3464 break;
3465 }
3466 case LTTNG_LIST_EVENTS:
3467 {
3468 ssize_t nb_event;
3469 struct lttng_event *events = NULL;
3470
3471 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3472 cmd_ctx->lsm->u.list.channel_name, &events);
3473 if (nb_event < 0) {
3474 ret = -nb_event;
3475 goto error;
3476 }
3477
3478 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3479 if (ret < 0) {
3480 goto setup_error;
3481 }
3482
3483 /* Copy event list into message payload */
3484 memcpy(cmd_ctx->llm->payload, events,
3485 nb_event * sizeof(struct lttng_event));
3486
3487 free(events);
3488
3489 ret = LTTCOMM_OK;
3490 break;
3491 }
3492 case LTTNG_LIST_SESSIONS:
3493 {
3494 session_lock_list();
3495
3496 if (session_list_ptr->count == 0) {
3497 ret = LTTCOMM_NO_SESSION;
3498 session_unlock_list();
3499 goto error;
3500 }
3501
3502 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3503 session_list_ptr->count);
3504 if (ret < 0) {
3505 session_unlock_list();
3506 goto setup_error;
3507 }
3508
3509 /* Filled the session array */
3510 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3511
3512 session_unlock_list();
3513
3514 ret = LTTCOMM_OK;
3515 break;
3516 }
3517 case LTTNG_CALIBRATE:
3518 {
3519 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3520 &cmd_ctx->lsm->u.calibrate);
3521 break;
3522 }
3523 case LTTNG_REGISTER_CONSUMER:
3524 {
3525 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3526 cmd_ctx->lsm->u.reg.path);
3527 break;
3528 }
3529 default:
3530 ret = LTTCOMM_UND;
3531 break;
3532 }
3533
3534 error:
3535 if (cmd_ctx->llm == NULL) {
3536 DBG("Missing llm structure. Allocating one.");
3537 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3538 goto setup_error;
3539 }
3540 }
3541 /* Set return code */
3542 cmd_ctx->llm->ret_code = ret;
3543 setup_error:
3544 if (cmd_ctx->session) {
3545 session_unlock(cmd_ctx->session);
3546 }
3547 init_setup_error:
3548 return ret;
3549 }
3550
3551 /*
3552 * This thread manage all clients request using the unix client socket for
3553 * communication.
3554 */
3555 static void *thread_manage_clients(void *data)
3556 {
3557 int sock = 0, ret, i, pollfd;
3558 uint32_t revents, nb_fd;
3559 struct command_ctx *cmd_ctx = NULL;
3560 struct lttng_poll_event events;
3561
3562 DBG("[thread] Manage client started");
3563
3564 rcu_register_thread();
3565
3566 ret = lttcomm_listen_unix_sock(client_sock);
3567 if (ret < 0) {
3568 goto error;
3569 }
3570
3571 /*
3572 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3573 * more will be added to this poll set.
3574 */
3575 ret = create_thread_poll_set(&events, 2);
3576 if (ret < 0) {
3577 goto error;
3578 }
3579
3580 /* Add the application registration socket */
3581 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3582 if (ret < 0) {
3583 goto error;
3584 }
3585
3586 /*
3587 * Notify parent pid that we are ready to accept command for client side.
3588 */
3589 if (opt_sig_parent) {
3590 kill(ppid, SIGCHLD);
3591 }
3592
3593 while (1) {
3594 DBG("Accepting client command ...");
3595
3596 nb_fd = LTTNG_POLL_GETNB(&events);
3597
3598 /* Inifinite blocking call, waiting for transmission */
3599 ret = lttng_poll_wait(&events, -1);
3600 if (ret < 0) {
3601 goto error;
3602 }
3603
3604 for (i = 0; i < nb_fd; i++) {
3605 /* Fetch once the poll data */
3606 revents = LTTNG_POLL_GETEV(&events, i);
3607 pollfd = LTTNG_POLL_GETFD(&events, i);
3608
3609 /* Thread quit pipe has been closed. Killing thread. */
3610 ret = check_thread_quit_pipe(pollfd, revents);
3611 if (ret) {
3612 goto error;
3613 }
3614
3615 /* Event on the registration socket */
3616 if (pollfd == client_sock) {
3617 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3618 ERR("Client socket poll error");
3619 goto error;
3620 }
3621 }
3622 }
3623
3624 DBG("Wait for client response");
3625
3626 sock = lttcomm_accept_unix_sock(client_sock);
3627 if (sock < 0) {
3628 goto error;
3629 }
3630
3631 /* Allocate context command to process the client request */
3632 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3633 if (cmd_ctx == NULL) {
3634 perror("zmalloc cmd_ctx");
3635 goto error;
3636 }
3637
3638 /* Allocate data buffer for reception */
3639 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3640 if (cmd_ctx->lsm == NULL) {
3641 perror("zmalloc cmd_ctx->lsm");
3642 goto error;
3643 }
3644
3645 cmd_ctx->llm = NULL;
3646 cmd_ctx->session = NULL;
3647
3648 /*
3649 * Data is received from the lttng client. The struct
3650 * lttcomm_session_msg (lsm) contains the command and data request of
3651 * the client.
3652 */
3653 DBG("Receiving data from client ...");
3654 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3655 sizeof(struct lttcomm_session_msg));
3656 if (ret <= 0) {
3657 DBG("Nothing recv() from client... continuing");
3658 close(sock);
3659 free(cmd_ctx);
3660 continue;
3661 }
3662
3663 // TODO: Validate cmd_ctx including sanity check for
3664 // security purpose.
3665
3666 rcu_thread_online();
3667 /*
3668 * This function dispatch the work to the kernel or userspace tracer
3669 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3670 * informations for the client. The command context struct contains
3671 * everything this function may needs.
3672 */
3673 ret = process_client_msg(cmd_ctx);
3674 rcu_thread_offline();
3675 if (ret < 0) {
3676 /*
3677 * TODO: Inform client somehow of the fatal error. At
3678 * this point, ret < 0 means that a zmalloc failed
3679 * (ENOMEM). Error detected but still accept command.
3680 */
3681 clean_command_ctx(&cmd_ctx);
3682 continue;
3683 }
3684
3685 DBG("Sending response (size: %d, retcode: %s)",
3686 cmd_ctx->lttng_msg_size,
3687 lttng_strerror(-cmd_ctx->llm->ret_code));
3688 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3689 if (ret < 0) {
3690 ERR("Failed to send data back to client");
3691 }
3692
3693 clean_command_ctx(&cmd_ctx);
3694
3695 /* End of transmission */
3696 close(sock);
3697 }
3698
3699 error:
3700 DBG("Client thread dying");
3701 unlink(client_unix_sock_path);
3702 close(client_sock);
3703 close(sock);
3704
3705 lttng_poll_clean(&events);
3706 clean_command_ctx(&cmd_ctx);
3707
3708 rcu_unregister_thread();
3709 return NULL;
3710 }
3711
3712
3713 /*
3714 * usage function on stderr
3715 */
3716 static void usage(void)
3717 {
3718 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3719 fprintf(stderr, " -h, --help Display this usage.\n");
3720 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3721 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3722 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3723 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3724 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3725 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3726 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3727 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3728 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3729 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3730 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3731 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3732 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3733 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3734 fprintf(stderr, " -V, --version Show version number.\n");
3735 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3736 fprintf(stderr, " -q, --quiet No output at all.\n");
3737 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3738 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3739 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3740 }
3741
3742 /*
3743 * daemon argument parsing
3744 */
3745 static int parse_args(int argc, char **argv)
3746 {
3747 int c;
3748
3749 static struct option long_options[] = {
3750 { "client-sock", 1, 0, 'c' },
3751 { "apps-sock", 1, 0, 'a' },
3752 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3753 { "kconsumerd-err-sock", 1, 0, 'E' },
3754 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3755 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3756 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3757 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3758 { "consumerd32-path", 1, 0, 'u' },
3759 { "consumerd32-libdir", 1, 0, 'U' },
3760 { "consumerd64-path", 1, 0, 't' },
3761 { "consumerd64-libdir", 1, 0, 'T' },
3762 { "daemonize", 0, 0, 'd' },
3763 { "sig-parent", 0, 0, 'S' },
3764 { "help", 0, 0, 'h' },
3765 { "group", 1, 0, 'g' },
3766 { "version", 0, 0, 'V' },
3767 { "quiet", 0, 0, 'q' },
3768 { "verbose", 0, 0, 'v' },
3769 { "verbose-consumer", 0, 0, 'Z' },
3770 { "no-kernel", 0, 0, 'N' },
3771 { NULL, 0, 0, 0 }
3772 };
3773
3774 while (1) {
3775 int option_index = 0;
3776 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3777 long_options, &option_index);
3778 if (c == -1) {
3779 break;
3780 }
3781
3782 switch (c) {
3783 case 0:
3784 fprintf(stderr, "option %s", long_options[option_index].name);
3785 if (optarg) {
3786 fprintf(stderr, " with arg %s\n", optarg);
3787 }
3788 break;
3789 case 'c':
3790 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3791 break;
3792 case 'a':
3793 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3794 break;
3795 case 'd':
3796 opt_daemon = 1;
3797 break;
3798 case 'g':
3799 opt_tracing_group = optarg;
3800 break;
3801 case 'h':
3802 usage();
3803 exit(EXIT_FAILURE);
3804 case 'V':
3805 fprintf(stdout, "%s\n", VERSION);
3806 exit(EXIT_SUCCESS);
3807 case 'S':
3808 opt_sig_parent = 1;
3809 break;
3810 case 'E':
3811 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3812 break;
3813 case 'C':
3814 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3815 break;
3816 case 'F':
3817 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3818 break;
3819 case 'D':
3820 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3821 break;
3822 case 'H':
3823 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3824 break;
3825 case 'G':
3826 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3827 break;
3828 case 'N':
3829 opt_no_kernel = 1;
3830 break;
3831 case 'q':
3832 opt_quiet = 1;
3833 break;
3834 case 'v':
3835 /* Verbose level can increase using multiple -v */
3836 opt_verbose += 1;
3837 break;
3838 case 'Z':
3839 opt_verbose_consumer += 1;
3840 break;
3841 case 'u':
3842 consumerd32_bin= optarg;
3843 break;
3844 case 'U':
3845 consumerd32_libdir = optarg;
3846 break;
3847 case 't':
3848 consumerd64_bin = optarg;
3849 break;
3850 case 'T':
3851 consumerd64_libdir = optarg;
3852 break;
3853 default:
3854 /* Unknown option or other error.
3855 * Error is printed by getopt, just return */
3856 return -1;
3857 }
3858 }
3859
3860 return 0;
3861 }
3862
3863 /*
3864 * Creates the two needed socket by the daemon.
3865 * apps_sock - The communication socket for all UST apps.
3866 * client_sock - The communication of the cli tool (lttng).
3867 */
3868 static int init_daemon_socket(void)
3869 {
3870 int ret = 0;
3871 mode_t old_umask;
3872
3873 old_umask = umask(0);
3874
3875 /* Create client tool unix socket */
3876 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3877 if (client_sock < 0) {
3878 ERR("Create unix sock failed: %s", client_unix_sock_path);
3879 ret = -1;
3880 goto end;
3881 }
3882
3883 /* File permission MUST be 660 */
3884 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3885 if (ret < 0) {
3886 ERR("Set file permissions failed: %s", client_unix_sock_path);
3887 perror("chmod");
3888 goto end;
3889 }
3890
3891 /* Create the application unix socket */
3892 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3893 if (apps_sock < 0) {
3894 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3895 ret = -1;
3896 goto end;
3897 }
3898
3899 /* File permission MUST be 666 */
3900 ret = chmod(apps_unix_sock_path,
3901 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3902 if (ret < 0) {
3903 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3904 perror("chmod");
3905 goto end;
3906 }
3907
3908 end:
3909 umask(old_umask);
3910 return ret;
3911 }
3912
3913 /*
3914 * Check if the global socket is available, and if a daemon is answering at the
3915 * other side. If yes, error is returned.
3916 */
3917 static int check_existing_daemon(void)
3918 {
3919 if (access(client_unix_sock_path, F_OK) < 0 &&
3920 access(apps_unix_sock_path, F_OK) < 0) {
3921 return 0;
3922 }
3923
3924 /* Is there anybody out there ? */
3925 if (lttng_session_daemon_alive()) {
3926 return -EEXIST;
3927 } else {
3928 return 0;
3929 }
3930 }
3931
3932 /*
3933 * Set the tracing group gid onto the client socket.
3934 *
3935 * Race window between mkdir and chown is OK because we are going from more
3936 * permissive (root.root) to les permissive (root.tracing).
3937 */
3938 static int set_permissions(void)
3939 {
3940 int ret;
3941 gid_t gid;
3942
3943 gid = allowed_group();
3944 if (gid < 0) {
3945 if (is_root) {
3946 WARN("No tracing group detected");
3947 ret = 0;
3948 } else {
3949 ERR("Missing tracing group. Aborting execution.");
3950 ret = -1;
3951 }
3952 goto end;
3953 }
3954
3955 /* Set lttng run dir */
3956 ret = chown(LTTNG_RUNDIR, 0, gid);
3957 if (ret < 0) {
3958 ERR("Unable to set group on " LTTNG_RUNDIR);
3959 perror("chown");
3960 }
3961
3962 /* lttng client socket path */
3963 ret = chown(client_unix_sock_path, 0, gid);
3964 if (ret < 0) {
3965 ERR("Unable to set group on %s", client_unix_sock_path);
3966 perror("chown");
3967 }
3968
3969 /* kconsumer error socket path */
3970 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3971 if (ret < 0) {
3972 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3973 perror("chown");
3974 }
3975
3976 /* 64-bit ustconsumer error socket path */
3977 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3978 if (ret < 0) {
3979 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3980 perror("chown");
3981 }
3982
3983 /* 32-bit ustconsumer compat32 error socket path */
3984 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3985 if (ret < 0) {
3986 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3987 perror("chown");
3988 }
3989
3990 DBG("All permissions are set");
3991
3992 end:
3993 return ret;
3994 }
3995
3996 /*
3997 * Create the pipe used to wake up the kernel thread.
3998 */
3999 static int create_kernel_poll_pipe(void)
4000 {
4001 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4002 }
4003
4004 /*
4005 * Create the application command pipe to wake thread_manage_apps.
4006 */
4007 static int create_apps_cmd_pipe(void)
4008 {
4009 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4010 }
4011
4012 /*
4013 * Create the lttng run directory needed for all global sockets and pipe.
4014 */
4015 static int create_lttng_rundir(const char *rundir)
4016 {
4017 int ret;
4018
4019 DBG3("Creating LTTng run directory: %s", rundir);
4020
4021 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4022 if (ret < 0) {
4023 if (errno != EEXIST) {
4024 ERR("Unable to create %s", rundir);
4025 goto error;
4026 } else {
4027 ret = 0;
4028 }
4029 }
4030
4031 error:
4032 return ret;
4033 }
4034
4035 /*
4036 * Setup sockets and directory needed by the kconsumerd communication with the
4037 * session daemon.
4038 */
4039 static int set_consumer_sockets(struct consumer_data *consumer_data,
4040 const char *rundir)
4041 {
4042 int ret;
4043 char path[PATH_MAX];
4044
4045 switch (consumer_data->type) {
4046 case LTTNG_CONSUMER_KERNEL:
4047 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
4048 break;
4049 case LTTNG_CONSUMER64_UST:
4050 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
4051 break;
4052 case LTTNG_CONSUMER32_UST:
4053 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
4054 break;
4055 default:
4056 ERR("Consumer type unknown");
4057 ret = -EINVAL;
4058 goto error;
4059 }
4060
4061 DBG2("Creating consumer directory: %s", path);
4062
4063 ret = mkdir(path, S_IRWXU | S_IRWXG);
4064 if (ret < 0) {
4065 if (errno != EEXIST) {
4066 ERR("Failed to create %s", path);
4067 goto error;
4068 }
4069 ret = 0;
4070 }
4071
4072 /* Create the kconsumerd error unix socket */
4073 consumer_data->err_sock =
4074 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4075 if (consumer_data->err_sock < 0) {
4076 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4077 ret = -1;
4078 goto error;
4079 }
4080
4081 /* File permission MUST be 660 */
4082 ret = chmod(consumer_data->err_unix_sock_path,
4083 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4084 if (ret < 0) {
4085 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4086 PERROR("chmod");
4087 goto error;
4088 }
4089
4090 error:
4091 return ret;
4092 }
4093
4094 /*
4095 * Signal handler for the daemon
4096 *
4097 * Simply stop all worker threads, leaving main() return gracefully after
4098 * joining all threads and calling cleanup().
4099 */
4100 static void sighandler(int sig)
4101 {
4102 switch (sig) {
4103 case SIGPIPE:
4104 DBG("SIGPIPE catched");
4105 return;
4106 case SIGINT:
4107 DBG("SIGINT catched");
4108 stop_threads();
4109 break;
4110 case SIGTERM:
4111 DBG("SIGTERM catched");
4112 stop_threads();
4113 break;
4114 default:
4115 break;
4116 }
4117 }
4118
4119 /*
4120 * Setup signal handler for :
4121 * SIGINT, SIGTERM, SIGPIPE
4122 */
4123 static int set_signal_handler(void)
4124 {
4125 int ret = 0;
4126 struct sigaction sa;
4127 sigset_t sigset;
4128
4129 if ((ret = sigemptyset(&sigset)) < 0) {
4130 perror("sigemptyset");
4131 return ret;
4132 }
4133
4134 sa.sa_handler = sighandler;
4135 sa.sa_mask = sigset;
4136 sa.sa_flags = 0;
4137 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4138 perror("sigaction");
4139 return ret;
4140 }
4141
4142 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4143 perror("sigaction");
4144 return ret;
4145 }
4146
4147 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4148 perror("sigaction");
4149 return ret;
4150 }
4151
4152 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4153
4154 return ret;
4155 }
4156
4157 /*
4158 * Set open files limit to unlimited. This daemon can open a large number of
4159 * file descriptors in order to consumer multiple kernel traces.
4160 */
4161 static void set_ulimit(void)
4162 {
4163 int ret;
4164 struct rlimit lim;
4165
4166 /* The kernel does not allowed an infinite limit for open files */
4167 lim.rlim_cur = 65535;
4168 lim.rlim_max = 65535;
4169
4170 ret = setrlimit(RLIMIT_NOFILE, &lim);
4171 if (ret < 0) {
4172 perror("failed to set open files limit");
4173 }
4174 }
4175
4176 /*
4177 * main
4178 */
4179 int main(int argc, char **argv)
4180 {
4181 int ret = 0;
4182 void *status;
4183 const char *home_path;
4184
4185 rcu_register_thread();
4186
4187 /* Create thread quit pipe */
4188 if ((ret = init_thread_quit_pipe()) < 0) {
4189 goto error;
4190 }
4191
4192 setup_consumerd_path();
4193
4194 /* Parse arguments */
4195 progname = argv[0];
4196 if ((ret = parse_args(argc, argv) < 0)) {
4197 goto error;
4198 }
4199
4200 /* Daemonize */
4201 if (opt_daemon) {
4202 ret = daemon(0, 0);
4203 if (ret < 0) {
4204 perror("daemon");
4205 goto error;
4206 }
4207 }
4208
4209 /* Check if daemon is UID = 0 */
4210 is_root = !getuid();
4211
4212 if (is_root) {
4213 rundir = strdup(LTTNG_RUNDIR);
4214
4215 /* Create global run dir with root access */
4216 ret = create_lttng_rundir(rundir);
4217 if (ret < 0) {
4218 goto error;
4219 }
4220
4221 if (strlen(apps_unix_sock_path) == 0) {
4222 snprintf(apps_unix_sock_path, PATH_MAX,
4223 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4224 }
4225
4226 if (strlen(client_unix_sock_path) == 0) {
4227 snprintf(client_unix_sock_path, PATH_MAX,
4228 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4229 }
4230
4231 /* Set global SHM for ust */
4232 if (strlen(wait_shm_path) == 0) {
4233 snprintf(wait_shm_path, PATH_MAX,
4234 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4235 }
4236
4237 /* Setup kernel consumerd path */
4238 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4239 KCONSUMERD_ERR_SOCK_PATH, rundir);
4240 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4241 KCONSUMERD_CMD_SOCK_PATH, rundir);
4242
4243 DBG2("Kernel consumer err path: %s",
4244 kconsumer_data.err_unix_sock_path);
4245 DBG2("Kernel consumer cmd path: %s",
4246 kconsumer_data.cmd_unix_sock_path);
4247 } else {
4248 home_path = get_home_dir();
4249 if (home_path == NULL) {
4250 /* TODO: Add --socket PATH option */
4251 ERR("Can't get HOME directory for sockets creation.");
4252 ret = -EPERM;
4253 goto error;
4254 }
4255
4256 /*
4257 * Create rundir from home path. This will create something like
4258 * $HOME/.lttng
4259 */
4260 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4261 if (ret < 0) {
4262 ret = -ENOMEM;
4263 goto error;
4264 }
4265
4266 ret = create_lttng_rundir(rundir);
4267 if (ret < 0) {
4268 goto error;
4269 }
4270
4271 if (strlen(apps_unix_sock_path) == 0) {
4272 snprintf(apps_unix_sock_path, PATH_MAX,
4273 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4274 }
4275
4276 /* Set the cli tool unix socket path */
4277 if (strlen(client_unix_sock_path) == 0) {
4278 snprintf(client_unix_sock_path, PATH_MAX,
4279 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4280 }
4281
4282 /* Set global SHM for ust */
4283 if (strlen(wait_shm_path) == 0) {
4284 snprintf(wait_shm_path, PATH_MAX,
4285 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4286 }
4287 }
4288
4289 DBG("Client socket path %s", client_unix_sock_path);
4290 DBG("Application socket path %s", apps_unix_sock_path);
4291 DBG("LTTng run directory path: %s", rundir);
4292
4293 /* 32 bits consumerd path setup */
4294 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4295 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4296 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4297 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4298
4299 DBG2("UST consumer 32 bits err path: %s",
4300 ustconsumer32_data.err_unix_sock_path);
4301 DBG2("UST consumer 32 bits cmd path: %s",
4302 ustconsumer32_data.cmd_unix_sock_path);
4303
4304 /* 64 bits consumerd path setup */
4305 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4306 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4307 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4308 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4309
4310 DBG2("UST consumer 64 bits err path: %s",
4311 ustconsumer64_data.err_unix_sock_path);
4312 DBG2("UST consumer 64 bits cmd path: %s",
4313 ustconsumer64_data.cmd_unix_sock_path);
4314
4315 /*
4316 * See if daemon already exist.
4317 */
4318 if ((ret = check_existing_daemon()) < 0) {
4319 ERR("Already running daemon.\n");
4320 /*
4321 * We do not goto exit because we must not cleanup()
4322 * because a daemon is already running.
4323 */
4324 goto error;
4325 }
4326
4327 /* After this point, we can safely call cleanup() with "goto exit" */
4328
4329 /*
4330 * These actions must be executed as root. We do that *after* setting up
4331 * the sockets path because we MUST make the check for another daemon using
4332 * those paths *before* trying to set the kernel consumer sockets and init
4333 * kernel tracer.
4334 */
4335 if (is_root) {
4336 ret = set_consumer_sockets(&kconsumer_data, rundir);
4337 if (ret < 0) {
4338 goto exit;
4339 }
4340
4341 /* Setup kernel tracer */
4342 if (!opt_no_kernel) {
4343 init_kernel_tracer();
4344 }
4345
4346 /* Set ulimit for open files */
4347 set_ulimit();
4348 }
4349
4350 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4351 if (ret < 0) {
4352 goto exit;
4353 }
4354
4355 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4356 if (ret < 0) {
4357 goto exit;
4358 }
4359
4360 if ((ret = set_signal_handler()) < 0) {
4361 goto exit;
4362 }
4363
4364 /* Setup the needed unix socket */
4365 if ((ret = init_daemon_socket()) < 0) {
4366 goto exit;
4367 }
4368
4369 /* Set credentials to socket */
4370 if (is_root && ((ret = set_permissions()) < 0)) {
4371 goto exit;
4372 }
4373
4374 /* Get parent pid if -S, --sig-parent is specified. */
4375 if (opt_sig_parent) {
4376 ppid = getppid();
4377 }
4378
4379 /* Setup the kernel pipe for waking up the kernel thread */
4380 if ((ret = create_kernel_poll_pipe()) < 0) {
4381 goto exit;
4382 }
4383
4384 /* Setup the thread apps communication pipe. */
4385 if ((ret = create_apps_cmd_pipe()) < 0) {
4386 goto exit;
4387 }
4388
4389 /* Init UST command queue. */
4390 cds_wfq_init(&ust_cmd_queue.queue);
4391
4392 /* Init UST app hash table */
4393 ust_app_ht_alloc();
4394
4395 /*
4396 * Get session list pointer. This pointer MUST NOT be free(). This list is
4397 * statically declared in session.c
4398 */
4399 session_list_ptr = session_get_list();
4400
4401 /* Set up max poll set size */
4402 lttng_poll_set_max_size();
4403
4404 /* Create thread to manage the client socket */
4405 ret = pthread_create(&client_thread, NULL,
4406 thread_manage_clients, (void *) NULL);
4407 if (ret != 0) {
4408 perror("pthread_create clients");
4409 goto exit_client;
4410 }
4411
4412 /* Create thread to dispatch registration */
4413 ret = pthread_create(&dispatch_thread, NULL,
4414 thread_dispatch_ust_registration, (void *) NULL);
4415 if (ret != 0) {
4416 perror("pthread_create dispatch");
4417 goto exit_dispatch;
4418 }
4419
4420 /* Create thread to manage application registration. */
4421 ret = pthread_create(&reg_apps_thread, NULL,
4422 thread_registration_apps, (void *) NULL);
4423 if (ret != 0) {
4424 perror("pthread_create registration");
4425 goto exit_reg_apps;
4426 }
4427
4428 /* Create thread to manage application socket */
4429 ret = pthread_create(&apps_thread, NULL,
4430 thread_manage_apps, (void *) NULL);
4431 if (ret != 0) {
4432 perror("pthread_create apps");
4433 goto exit_apps;
4434 }
4435
4436 /* Create kernel thread to manage kernel event */
4437 ret = pthread_create(&kernel_thread, NULL,
4438 thread_manage_kernel, (void *) NULL);
4439 if (ret != 0) {
4440 perror("pthread_create kernel");
4441 goto exit_kernel;
4442 }
4443
4444 ret = pthread_join(kernel_thread, &status);
4445 if (ret != 0) {
4446 perror("pthread_join");
4447 goto error; /* join error, exit without cleanup */
4448 }
4449
4450 exit_kernel:
4451 ret = pthread_join(apps_thread, &status);
4452 if (ret != 0) {
4453 perror("pthread_join");
4454 goto error; /* join error, exit without cleanup */
4455 }
4456
4457 exit_apps:
4458 ret = pthread_join(reg_apps_thread, &status);
4459 if (ret != 0) {
4460 perror("pthread_join");
4461 goto error; /* join error, exit without cleanup */
4462 }
4463
4464 exit_reg_apps:
4465 ret = pthread_join(dispatch_thread, &status);
4466 if (ret != 0) {
4467 perror("pthread_join");
4468 goto error; /* join error, exit without cleanup */
4469 }
4470
4471 exit_dispatch:
4472 ret = pthread_join(client_thread, &status);
4473 if (ret != 0) {
4474 perror("pthread_join");
4475 goto error; /* join error, exit without cleanup */
4476 }
4477
4478 ret = join_consumer_thread(&kconsumer_data);
4479 if (ret != 0) {
4480 perror("join_consumer");
4481 goto error; /* join error, exit without cleanup */
4482 }
4483
4484 exit_client:
4485 exit:
4486 /*
4487 * cleanup() is called when no other thread is running.
4488 */
4489 rcu_thread_online();
4490 cleanup();
4491 rcu_thread_offline();
4492 rcu_unregister_thread();
4493 if (!ret) {
4494 exit(EXIT_SUCCESS);
4495 }
4496 error:
4497 exit(EXIT_FAILURE);
4498 }
LTTng 2.0 tools and control repository
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