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Fix: main.c client/apps sockets and kernel_trace_fd close(0)
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 /* Const values */
79 const char default_home_dir[] = DEFAULT_HOME_DIR;
80 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
81 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
84 /* Variables */
85 int opt_verbose; /* Not static for lttngerr.h */
86 int opt_verbose_consumer; /* Not static for lttngerr.h */
87 int opt_quiet; /* Not static for lttngerr.h */
88
89 const char *progname;
90 const char *opt_tracing_group;
91 static int opt_sig_parent;
92 static int opt_daemon;
93 static int opt_no_kernel;
94 static int is_root; /* Set to 1 if the daemon is running as root */
95 static pid_t ppid; /* Parent PID for --sig-parent option */
96 static char *rundir;
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
108 };
109 static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
113 };
114
115 static int dispatch_thread_exit;
116
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path[PATH_MAX];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path[PATH_MAX];
121 /* global wait shm path for UST */
122 static char wait_shm_path[PATH_MAX];
123
124 /* Sockets and FDs */
125 static int client_sock = -1;
126 static int apps_sock = -1;
127 static int kernel_tracer_fd = -1;
128 static int kernel_poll_pipe[2];
129
130 /*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134 static int thread_quit_pipe[2];
135
136 /*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140 static int apps_cmd_pipe[2];
141
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread;
144 static pthread_t reg_apps_thread;
145 static pthread_t client_thread;
146 static pthread_t kernel_thread;
147 static pthread_t dispatch_thread;
148
149
150 /*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157 static struct ust_cmd_queue ust_cmd_queue;
158
159 /*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
165 *
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
168 */
169 static struct ltt_session_list *session_list_ptr;
170
171 int ust_consumerd64_fd = -1;
172 int ust_consumerd32_fd = -1;
173
174 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
178
179 static
180 void setup_consumerd_path(void)
181 {
182 const char *bin, *libdir;
183
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
188 */
189 #if (CAA_BITS_PER_LONG == 32)
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196 #elif (CAA_BITS_PER_LONG == 64)
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
199 }
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
202 }
203 #else
204 #error "Unknown bitness"
205 #endif
206
207 /*
208 * runtime env. var. overrides the build default.
209 */
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
213 }
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
217 }
218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
223 if (libdir) {
224 consumerd64_libdir = libdir;
225 }
226 }
227
228 /*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231 static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233 {
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254 error:
255 return ret;
256 }
257
258 /*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263 static int check_thread_quit_pipe(int fd, uint32_t events)
264 {
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270 }
271
272 /*
273 * Return group ID of the tracing group or -1 if not found.
274 */
275 static gid_t allowed_group(void)
276 {
277 struct group *grp;
278
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289 }
290
291 /*
292 * Init thread quit pipe.
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296 static int init_thread_quit_pipe(void)
297 {
298 int ret;
299
300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
301 if (ret < 0) {
302 perror("thread quit pipe");
303 goto error;
304 }
305
306 error:
307 return ret;
308 }
309
310 /*
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
313 */
314 static void teardown_kernel_session(struct ltt_session *session)
315 {
316 if (!session->kernel_session) {
317 DBG3("No kernel session when tearing down session");
318 return;
319 }
320
321 DBG("Tearing down kernel session");
322
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
329 }
330
331 trace_kernel_destroy_session(session->kernel_session);
332 }
333
334 /*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338 static void teardown_ust_session(struct ltt_session *session)
339 {
340 int ret;
341
342 if (!session->ust_session) {
343 DBG3("No UST session when tearing down session");
344 return;
345 }
346
347 DBG("Tearing down UST session(s)");
348
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
353
354 trace_ust_destroy_session(session->ust_session);
355 }
356
357 /*
358 * Stop all threads by closing the thread quit pipe.
359 */
360 static void stop_threads(void)
361 {
362 int ret;
363
364 /* Stopping all threads */
365 DBG("Terminating all threads");
366 ret = notify_thread_pipe(thread_quit_pipe[1]);
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
374 }
375
376 /*
377 * Cleanup the daemon
378 */
379 static void cleanup(void)
380 {
381 int ret;
382 char *cmd;
383 struct ltt_session *sess, *stmp;
384
385 DBG("Cleaning up");
386
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
392
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
397 }
398 free(cmd);
399
400 DBG("Cleaning up all sessions");
401
402 /* Destroy session list mutex */
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
409 teardown_kernel_session(sess);
410 teardown_ust_session(sess);
411 free(sess);
412 }
413 }
414
415 DBG("Closing all UST sockets");
416 ust_app_clean_list();
417
418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
419
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
422 if (kernel_tracer_fd >= 0) {
423 close(kernel_tracer_fd);
424 }
425 DBG("Unloading kernel modules");
426 modprobe_remove_lttng_all();
427 }
428
429 close(thread_quit_pipe[0]);
430 close(thread_quit_pipe[1]);
431
432 /* <fun> */
433 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
434 "Matthew, BEET driven development works!%c[%dm",
435 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
436 /* </fun> */
437 }
438
439 /*
440 * Send data on a unix socket using the liblttsessiondcomm API.
441 *
442 * Return lttcomm error code.
443 */
444 static int send_unix_sock(int sock, void *buf, size_t len)
445 {
446 /* Check valid length */
447 if (len <= 0) {
448 return -1;
449 }
450
451 return lttcomm_send_unix_sock(sock, buf, len);
452 }
453
454 /*
455 * Free memory of a command context structure.
456 */
457 static void clean_command_ctx(struct command_ctx **cmd_ctx)
458 {
459 DBG("Clean command context structure");
460 if (*cmd_ctx) {
461 if ((*cmd_ctx)->llm) {
462 free((*cmd_ctx)->llm);
463 }
464 if ((*cmd_ctx)->lsm) {
465 free((*cmd_ctx)->lsm);
466 }
467 free(*cmd_ctx);
468 *cmd_ctx = NULL;
469 }
470 }
471
472 /*
473 * Send all stream fds of kernel channel to the consumer.
474 */
475 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
476 int sock, struct ltt_kernel_channel *channel,
477 uid_t uid, gid_t gid)
478 {
479 int ret;
480 struct ltt_kernel_stream *stream;
481 struct lttcomm_consumer_msg lkm;
482
483 DBG("Sending streams of channel %s to kernel consumer",
484 channel->channel->name);
485
486 /* Send channel */
487 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
488 lkm.u.channel.channel_key = channel->fd;
489 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
490 lkm.u.channel.mmap_len = 0; /* for kernel */
491 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
492 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
493 if (ret < 0) {
494 perror("send consumer channel");
495 goto error;
496 }
497
498 /* Send streams */
499 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
500 if (!stream->fd) {
501 continue;
502 }
503 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
504 lkm.u.stream.channel_key = channel->fd;
505 lkm.u.stream.stream_key = stream->fd;
506 lkm.u.stream.state = stream->state;
507 lkm.u.stream.output = channel->channel->attr.output;
508 lkm.u.stream.mmap_len = 0; /* for kernel */
509 lkm.u.stream.uid = uid;
510 lkm.u.stream.gid = gid;
511 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
512 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
513 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
514 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
515 if (ret < 0) {
516 perror("send consumer stream");
517 goto error;
518 }
519 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
520 if (ret < 0) {
521 perror("send consumer stream ancillary data");
522 goto error;
523 }
524 }
525
526 DBG("consumer channel streams sent");
527
528 return 0;
529
530 error:
531 return ret;
532 }
533
534 /*
535 * Send all stream fds of the kernel session to the consumer.
536 */
537 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
538 struct ltt_kernel_session *session)
539 {
540 int ret;
541 struct ltt_kernel_channel *chan;
542 struct lttcomm_consumer_msg lkm;
543 int sock = session->consumer_fd;
544
545 DBG("Sending metadata stream fd");
546
547 /* Extra protection. It's NOT supposed to be set to 0 at this point */
548 if (session->consumer_fd == 0) {
549 session->consumer_fd = consumer_data->cmd_sock;
550 }
551
552 if (session->metadata_stream_fd != 0) {
553 /* Send metadata channel fd */
554 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
555 lkm.u.channel.channel_key = session->metadata->fd;
556 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
557 lkm.u.channel.mmap_len = 0; /* for kernel */
558 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
559 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
560 if (ret < 0) {
561 perror("send consumer channel");
562 goto error;
563 }
564
565 /* Send metadata stream fd */
566 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
567 lkm.u.stream.channel_key = session->metadata->fd;
568 lkm.u.stream.stream_key = session->metadata_stream_fd;
569 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
570 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
571 lkm.u.stream.mmap_len = 0; /* for kernel */
572 lkm.u.stream.uid = session->uid;
573 lkm.u.stream.gid = session->gid;
574 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
575 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
576 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
577 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
578 if (ret < 0) {
579 perror("send consumer stream");
580 goto error;
581 }
582 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
583 if (ret < 0) {
584 perror("send consumer stream");
585 goto error;
586 }
587 }
588
589 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
590 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
591 session->uid, session->gid);
592 if (ret < 0) {
593 goto error;
594 }
595 }
596
597 DBG("consumer fds (metadata and channel streams) sent");
598
599 return 0;
600
601 error:
602 return ret;
603 }
604
605 /*
606 * Notify UST applications using the shm mmap futex.
607 */
608 static int notify_ust_apps(int active)
609 {
610 char *wait_shm_mmap;
611
612 DBG("Notifying applications of session daemon state: %d", active);
613
614 /* See shm.c for this call implying mmap, shm and futex calls */
615 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
616 if (wait_shm_mmap == NULL) {
617 goto error;
618 }
619
620 /* Wake waiting process */
621 futex_wait_update((int32_t *) wait_shm_mmap, active);
622
623 /* Apps notified successfully */
624 return 0;
625
626 error:
627 return -1;
628 }
629
630 /*
631 * Setup the outgoing data buffer for the response (llm) by allocating the
632 * right amount of memory and copying the original information from the lsm
633 * structure.
634 *
635 * Return total size of the buffer pointed by buf.
636 */
637 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
638 {
639 int ret, buf_size;
640
641 buf_size = size;
642
643 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
644 if (cmd_ctx->llm == NULL) {
645 perror("zmalloc");
646 ret = -ENOMEM;
647 goto error;
648 }
649
650 /* Copy common data */
651 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
652 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
653
654 cmd_ctx->llm->data_size = size;
655 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
656
657 return buf_size;
658
659 error:
660 return ret;
661 }
662
663 /*
664 * Update the kernel poll set of all channel fd available over all tracing
665 * session. Add the wakeup pipe at the end of the set.
666 */
667 static int update_kernel_poll(struct lttng_poll_event *events)
668 {
669 int ret;
670 struct ltt_session *session;
671 struct ltt_kernel_channel *channel;
672
673 DBG("Updating kernel poll set");
674
675 session_lock_list();
676 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
677 session_lock(session);
678 if (session->kernel_session == NULL) {
679 session_unlock(session);
680 continue;
681 }
682
683 cds_list_for_each_entry(channel,
684 &session->kernel_session->channel_list.head, list) {
685 /* Add channel fd to the kernel poll set */
686 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
687 if (ret < 0) {
688 session_unlock(session);
689 goto error;
690 }
691 DBG("Channel fd %d added to kernel set", channel->fd);
692 }
693 session_unlock(session);
694 }
695 session_unlock_list();
696
697 return 0;
698
699 error:
700 session_unlock_list();
701 return -1;
702 }
703
704 /*
705 * Find the channel fd from 'fd' over all tracing session. When found, check
706 * for new channel stream and send those stream fds to the kernel consumer.
707 *
708 * Useful for CPU hotplug feature.
709 */
710 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
711 {
712 int ret = 0;
713 struct ltt_session *session;
714 struct ltt_kernel_channel *channel;
715
716 DBG("Updating kernel streams for channel fd %d", fd);
717
718 session_lock_list();
719 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
720 session_lock(session);
721 if (session->kernel_session == NULL) {
722 session_unlock(session);
723 continue;
724 }
725
726 /* This is not suppose to be 0 but this is an extra security check */
727 if (session->kernel_session->consumer_fd == 0) {
728 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
729 }
730
731 cds_list_for_each_entry(channel,
732 &session->kernel_session->channel_list.head, list) {
733 if (channel->fd == fd) {
734 DBG("Channel found, updating kernel streams");
735 ret = kernel_open_channel_stream(channel);
736 if (ret < 0) {
737 goto error;
738 }
739
740 /*
741 * Have we already sent fds to the consumer? If yes, it means
742 * that tracing is started so it is safe to send our updated
743 * stream fds.
744 */
745 if (session->kernel_session->consumer_fds_sent == 1) {
746 ret = send_kconsumer_channel_streams(consumer_data,
747 session->kernel_session->consumer_fd, channel,
748 session->uid, session->gid);
749 if (ret < 0) {
750 goto error;
751 }
752 }
753 goto error;
754 }
755 }
756 session_unlock(session);
757 }
758 session_unlock_list();
759 return ret;
760
761 error:
762 session_unlock(session);
763 session_unlock_list();
764 return ret;
765 }
766
767 /*
768 * For each tracing session, update newly registered apps.
769 */
770 static void update_ust_app(int app_sock)
771 {
772 struct ltt_session *sess, *stmp;
773
774 session_lock_list();
775
776 /* For all tracing session(s) */
777 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
778 session_lock(sess);
779 if (sess->ust_session) {
780 ust_app_global_update(sess->ust_session, app_sock);
781 }
782 session_unlock(sess);
783 }
784
785 session_unlock_list();
786 }
787
788 /*
789 * This thread manage event coming from the kernel.
790 *
791 * Features supported in this thread:
792 * -) CPU Hotplug
793 */
794 static void *thread_manage_kernel(void *data)
795 {
796 int ret, i, pollfd, update_poll_flag = 1;
797 uint32_t revents, nb_fd;
798 char tmp;
799 struct lttng_poll_event events;
800
801 DBG("Thread manage kernel started");
802
803 ret = create_thread_poll_set(&events, 2);
804 if (ret < 0) {
805 goto error;
806 }
807
808 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
809 if (ret < 0) {
810 goto error;
811 }
812
813 while (1) {
814 if (update_poll_flag == 1) {
815 /*
816 * Reset number of fd in the poll set. Always 2 since there is the thread
817 * quit pipe and the kernel pipe.
818 */
819 events.nb_fd = 2;
820
821 ret = update_kernel_poll(&events);
822 if (ret < 0) {
823 goto error;
824 }
825 update_poll_flag = 0;
826 }
827
828 nb_fd = LTTNG_POLL_GETNB(&events);
829
830 DBG("Thread kernel polling on %d fds", nb_fd);
831
832 /* Zeroed the poll events */
833 lttng_poll_reset(&events);
834
835 /* Poll infinite value of time */
836 restart:
837 ret = lttng_poll_wait(&events, -1);
838 if (ret < 0) {
839 /*
840 * Restart interrupted system call.
841 */
842 if (errno == EINTR) {
843 goto restart;
844 }
845 goto error;
846 } else if (ret == 0) {
847 /* Should not happen since timeout is infinite */
848 ERR("Return value of poll is 0 with an infinite timeout.\n"
849 "This should not have happened! Continuing...");
850 continue;
851 }
852
853 for (i = 0; i < nb_fd; i++) {
854 /* Fetch once the poll data */
855 revents = LTTNG_POLL_GETEV(&events, i);
856 pollfd = LTTNG_POLL_GETFD(&events, i);
857
858 /* Thread quit pipe has been closed. Killing thread. */
859 ret = check_thread_quit_pipe(pollfd, revents);
860 if (ret) {
861 goto error;
862 }
863
864 /* Check for data on kernel pipe */
865 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
866 ret = read(kernel_poll_pipe[0], &tmp, 1);
867 update_poll_flag = 1;
868 continue;
869 } else {
870 /*
871 * New CPU detected by the kernel. Adding kernel stream to
872 * kernel session and updating the kernel consumer
873 */
874 if (revents & LPOLLIN) {
875 ret = update_kernel_stream(&kconsumer_data, pollfd);
876 if (ret < 0) {
877 continue;
878 }
879 break;
880 /*
881 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
882 * and unregister kernel stream at this point.
883 */
884 }
885 }
886 }
887 }
888
889 error:
890 DBG("Kernel thread dying");
891 close(kernel_poll_pipe[0]);
892 close(kernel_poll_pipe[1]);
893
894 lttng_poll_clean(&events);
895
896 return NULL;
897 }
898
899 /*
900 * This thread manage the consumer error sent back to the session daemon.
901 */
902 static void *thread_manage_consumer(void *data)
903 {
904 int sock = 0, i, ret, pollfd;
905 uint32_t revents, nb_fd;
906 enum lttcomm_return_code code;
907 struct lttng_poll_event events;
908 struct consumer_data *consumer_data = data;
909
910 DBG("[thread] Manage consumer started");
911
912 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
913 if (ret < 0) {
914 goto error;
915 }
916
917 /*
918 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
919 * Nothing more will be added to this poll set.
920 */
921 ret = create_thread_poll_set(&events, 2);
922 if (ret < 0) {
923 goto error;
924 }
925
926 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
927 if (ret < 0) {
928 goto error;
929 }
930
931 nb_fd = LTTNG_POLL_GETNB(&events);
932
933 /* Inifinite blocking call, waiting for transmission */
934 restart:
935 ret = lttng_poll_wait(&events, -1);
936 if (ret < 0) {
937 /*
938 * Restart interrupted system call.
939 */
940 if (errno == EINTR) {
941 goto restart;
942 }
943 goto error;
944 }
945
946 for (i = 0; i < nb_fd; i++) {
947 /* Fetch once the poll data */
948 revents = LTTNG_POLL_GETEV(&events, i);
949 pollfd = LTTNG_POLL_GETFD(&events, i);
950
951 /* Thread quit pipe has been closed. Killing thread. */
952 ret = check_thread_quit_pipe(pollfd, revents);
953 if (ret) {
954 goto error;
955 }
956
957 /* Event on the registration socket */
958 if (pollfd == consumer_data->err_sock) {
959 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
960 ERR("consumer err socket poll error");
961 goto error;
962 }
963 }
964 }
965
966 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
967 if (sock < 0) {
968 goto error;
969 }
970
971 DBG2("Receiving code from consumer err_sock");
972
973 /* Getting status code from kconsumerd */
974 ret = lttcomm_recv_unix_sock(sock, &code,
975 sizeof(enum lttcomm_return_code));
976 if (ret <= 0) {
977 goto error;
978 }
979
980 if (code == CONSUMERD_COMMAND_SOCK_READY) {
981 consumer_data->cmd_sock =
982 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
983 if (consumer_data->cmd_sock < 0) {
984 sem_post(&consumer_data->sem);
985 PERROR("consumer connect");
986 goto error;
987 }
988 /* Signal condition to tell that the kconsumerd is ready */
989 sem_post(&consumer_data->sem);
990 DBG("consumer command socket ready");
991 } else {
992 ERR("consumer error when waiting for SOCK_READY : %s",
993 lttcomm_get_readable_code(-code));
994 goto error;
995 }
996
997 /* Remove the kconsumerd error sock since we've established a connexion */
998 ret = lttng_poll_del(&events, consumer_data->err_sock);
999 if (ret < 0) {
1000 goto error;
1001 }
1002
1003 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1004 if (ret < 0) {
1005 goto error;
1006 }
1007
1008 /* Update number of fd */
1009 nb_fd = LTTNG_POLL_GETNB(&events);
1010
1011 /* Inifinite blocking call, waiting for transmission */
1012 restart_poll:
1013 ret = lttng_poll_wait(&events, -1);
1014 if (ret < 0) {
1015 /*
1016 * Restart interrupted system call.
1017 */
1018 if (errno == EINTR) {
1019 goto restart_poll;
1020 }
1021 goto error;
1022 }
1023
1024 for (i = 0; i < nb_fd; i++) {
1025 /* Fetch once the poll data */
1026 revents = LTTNG_POLL_GETEV(&events, i);
1027 pollfd = LTTNG_POLL_GETFD(&events, i);
1028
1029 /* Thread quit pipe has been closed. Killing thread. */
1030 ret = check_thread_quit_pipe(pollfd, revents);
1031 if (ret) {
1032 goto error;
1033 }
1034
1035 /* Event on the kconsumerd socket */
1036 if (pollfd == sock) {
1037 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1038 ERR("consumer err socket second poll error");
1039 goto error;
1040 }
1041 }
1042 }
1043
1044 /* Wait for any kconsumerd error */
1045 ret = lttcomm_recv_unix_sock(sock, &code,
1046 sizeof(enum lttcomm_return_code));
1047 if (ret <= 0) {
1048 ERR("consumer closed the command socket");
1049 goto error;
1050 }
1051
1052 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1053
1054 error:
1055 DBG("consumer thread dying");
1056 close(consumer_data->err_sock);
1057 close(consumer_data->cmd_sock);
1058 close(sock);
1059
1060 unlink(consumer_data->err_unix_sock_path);
1061 unlink(consumer_data->cmd_unix_sock_path);
1062 consumer_data->pid = 0;
1063
1064 lttng_poll_clean(&events);
1065
1066 return NULL;
1067 }
1068
1069 /*
1070 * This thread manage application communication.
1071 */
1072 static void *thread_manage_apps(void *data)
1073 {
1074 int i, ret, pollfd;
1075 uint32_t revents, nb_fd;
1076 struct ust_command ust_cmd;
1077 struct lttng_poll_event events;
1078
1079 DBG("[thread] Manage application started");
1080
1081 rcu_register_thread();
1082 rcu_thread_online();
1083
1084 ret = create_thread_poll_set(&events, 2);
1085 if (ret < 0) {
1086 goto error;
1087 }
1088
1089 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1090 if (ret < 0) {
1091 goto error;
1092 }
1093
1094 while (1) {
1095 /* Zeroed the events structure */
1096 lttng_poll_reset(&events);
1097
1098 nb_fd = LTTNG_POLL_GETNB(&events);
1099
1100 DBG("Apps thread polling on %d fds", nb_fd);
1101
1102 /* Inifinite blocking call, waiting for transmission */
1103 restart:
1104 ret = lttng_poll_wait(&events, -1);
1105 if (ret < 0) {
1106 /*
1107 * Restart interrupted system call.
1108 */
1109 if (errno == EINTR) {
1110 goto restart;
1111 }
1112 goto error;
1113 }
1114
1115 for (i = 0; i < nb_fd; i++) {
1116 /* Fetch once the poll data */
1117 revents = LTTNG_POLL_GETEV(&events, i);
1118 pollfd = LTTNG_POLL_GETFD(&events, i);
1119
1120 /* Thread quit pipe has been closed. Killing thread. */
1121 ret = check_thread_quit_pipe(pollfd, revents);
1122 if (ret) {
1123 goto error;
1124 }
1125
1126 /* Inspect the apps cmd pipe */
1127 if (pollfd == apps_cmd_pipe[0]) {
1128 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1129 ERR("Apps command pipe error");
1130 goto error;
1131 } else if (revents & LPOLLIN) {
1132 /* Empty pipe */
1133 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1134 if (ret < 0 || ret < sizeof(ust_cmd)) {
1135 perror("read apps cmd pipe");
1136 goto error;
1137 }
1138
1139 /* Register applicaton to the session daemon */
1140 ret = ust_app_register(&ust_cmd.reg_msg,
1141 ust_cmd.sock);
1142 if (ret == -ENOMEM) {
1143 goto error;
1144 } else if (ret < 0) {
1145 break;
1146 }
1147
1148 /*
1149 * Validate UST version compatibility.
1150 */
1151 ret = ust_app_validate_version(ust_cmd.sock);
1152 if (ret >= 0) {
1153 /*
1154 * Add channel(s) and event(s) to newly registered apps
1155 * from lttng global UST domain.
1156 */
1157 update_ust_app(ust_cmd.sock);
1158 }
1159
1160 ret = ust_app_register_done(ust_cmd.sock);
1161 if (ret < 0) {
1162 /*
1163 * If the registration is not possible, we simply
1164 * unregister the apps and continue
1165 */
1166 ust_app_unregister(ust_cmd.sock);
1167 } else {
1168 /*
1169 * We just need here to monitor the close of the UST
1170 * socket and poll set monitor those by default.
1171 * Listen on POLLIN (even if we never expect any
1172 * data) to ensure that hangup wakes us.
1173 */
1174 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
1175 if (ret < 0) {
1176 goto error;
1177 }
1178
1179 DBG("Apps with sock %d added to poll set",
1180 ust_cmd.sock);
1181 }
1182
1183 break;
1184 }
1185 } else {
1186 /*
1187 * At this point, we know that a registered application made
1188 * the event at poll_wait.
1189 */
1190 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1191 /* Removing from the poll set */
1192 ret = lttng_poll_del(&events, pollfd);
1193 if (ret < 0) {
1194 goto error;
1195 }
1196
1197 /* Socket closed on remote end. */
1198 ust_app_unregister(pollfd);
1199 break;
1200 }
1201 }
1202 }
1203 }
1204
1205 error:
1206 DBG("Application communication apps dying");
1207 close(apps_cmd_pipe[0]);
1208 close(apps_cmd_pipe[1]);
1209
1210 lttng_poll_clean(&events);
1211
1212 rcu_thread_offline();
1213 rcu_unregister_thread();
1214 return NULL;
1215 }
1216
1217 /*
1218 * Dispatch request from the registration threads to the application
1219 * communication thread.
1220 */
1221 static void *thread_dispatch_ust_registration(void *data)
1222 {
1223 int ret;
1224 struct cds_wfq_node *node;
1225 struct ust_command *ust_cmd = NULL;
1226
1227 DBG("[thread] Dispatch UST command started");
1228
1229 while (!dispatch_thread_exit) {
1230 /* Atomically prepare the queue futex */
1231 futex_nto1_prepare(&ust_cmd_queue.futex);
1232
1233 do {
1234 /* Dequeue command for registration */
1235 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1236 if (node == NULL) {
1237 DBG("Woken up but nothing in the UST command queue");
1238 /* Continue thread execution */
1239 break;
1240 }
1241
1242 ust_cmd = caa_container_of(node, struct ust_command, node);
1243
1244 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1245 " gid:%d sock:%d name:%s (version %d.%d)",
1246 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1247 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1248 ust_cmd->sock, ust_cmd->reg_msg.name,
1249 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1250 /*
1251 * Inform apps thread of the new application registration. This
1252 * call is blocking so we can be assured that the data will be read
1253 * at some point in time or wait to the end of the world :)
1254 */
1255 ret = write(apps_cmd_pipe[1], ust_cmd,
1256 sizeof(struct ust_command));
1257 if (ret < 0) {
1258 perror("write apps cmd pipe");
1259 if (errno == EBADF) {
1260 /*
1261 * We can't inform the application thread to process
1262 * registration. We will exit or else application
1263 * registration will not occur and tracing will never
1264 * start.
1265 */
1266 goto error;
1267 }
1268 }
1269 free(ust_cmd);
1270 } while (node != NULL);
1271
1272 /* Futex wait on queue. Blocking call on futex() */
1273 futex_nto1_wait(&ust_cmd_queue.futex);
1274 }
1275
1276 error:
1277 DBG("Dispatch thread dying");
1278 return NULL;
1279 }
1280
1281 /*
1282 * This thread manage application registration.
1283 */
1284 static void *thread_registration_apps(void *data)
1285 {
1286 int sock = -1, i, ret, pollfd;
1287 uint32_t revents, nb_fd;
1288 struct lttng_poll_event events;
1289 /*
1290 * Get allocated in this thread, enqueued to a global queue, dequeued and
1291 * freed in the manage apps thread.
1292 */
1293 struct ust_command *ust_cmd = NULL;
1294
1295 DBG("[thread] Manage application registration started");
1296
1297 ret = lttcomm_listen_unix_sock(apps_sock);
1298 if (ret < 0) {
1299 goto error;
1300 }
1301
1302 /*
1303 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1304 * more will be added to this poll set.
1305 */
1306 ret = create_thread_poll_set(&events, 2);
1307 if (ret < 0) {
1308 goto error;
1309 }
1310
1311 /* Add the application registration socket */
1312 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1313 if (ret < 0) {
1314 goto error;
1315 }
1316
1317 /* Notify all applications to register */
1318 ret = notify_ust_apps(1);
1319 if (ret < 0) {
1320 ERR("Failed to notify applications or create the wait shared memory.\n"
1321 "Execution continues but there might be problem for already\n"
1322 "running applications that wishes to register.");
1323 }
1324
1325 while (1) {
1326 DBG("Accepting application registration");
1327
1328 nb_fd = LTTNG_POLL_GETNB(&events);
1329
1330 /* Inifinite blocking call, waiting for transmission */
1331 restart:
1332 ret = lttng_poll_wait(&events, -1);
1333 if (ret < 0) {
1334 /*
1335 * Restart interrupted system call.
1336 */
1337 if (errno == EINTR) {
1338 goto restart;
1339 }
1340 goto error;
1341 }
1342
1343 for (i = 0; i < nb_fd; i++) {
1344 /* Fetch once the poll data */
1345 revents = LTTNG_POLL_GETEV(&events, i);
1346 pollfd = LTTNG_POLL_GETFD(&events, i);
1347
1348 /* Thread quit pipe has been closed. Killing thread. */
1349 ret = check_thread_quit_pipe(pollfd, revents);
1350 if (ret) {
1351 goto error;
1352 }
1353
1354 /* Event on the registration socket */
1355 if (pollfd == apps_sock) {
1356 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1357 ERR("Register apps socket poll error");
1358 goto error;
1359 } else if (revents & LPOLLIN) {
1360 sock = lttcomm_accept_unix_sock(apps_sock);
1361 if (sock < 0) {
1362 goto error;
1363 }
1364
1365 /* Create UST registration command for enqueuing */
1366 ust_cmd = zmalloc(sizeof(struct ust_command));
1367 if (ust_cmd == NULL) {
1368 perror("ust command zmalloc");
1369 goto error;
1370 }
1371
1372 /*
1373 * Using message-based transmissions to ensure we don't
1374 * have to deal with partially received messages.
1375 */
1376 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1377 sizeof(struct ust_register_msg));
1378 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1379 if (ret < 0) {
1380 perror("lttcomm_recv_unix_sock register apps");
1381 } else {
1382 ERR("Wrong size received on apps register");
1383 }
1384 free(ust_cmd);
1385 close(sock);
1386 continue;
1387 }
1388
1389 ust_cmd->sock = sock;
1390
1391 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1392 " gid:%d sock:%d name:%s (version %d.%d)",
1393 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1394 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1395 ust_cmd->sock, ust_cmd->reg_msg.name,
1396 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1397
1398 /*
1399 * Lock free enqueue the registration request. The red pill
1400 * has been taken! This apps will be part of the *system*.
1401 */
1402 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1403
1404 /*
1405 * Wake the registration queue futex. Implicit memory
1406 * barrier with the exchange in cds_wfq_enqueue.
1407 */
1408 futex_nto1_wake(&ust_cmd_queue.futex);
1409 }
1410 }
1411 }
1412 }
1413
1414 error:
1415 DBG("UST Registration thread dying");
1416
1417 /* Notify that the registration thread is gone */
1418 notify_ust_apps(0);
1419
1420 if (apps_sock >= 0) {
1421 close(apps_sock);
1422 }
1423 if (clock >= 0) {
1424 close(sock);
1425 }
1426 unlink(apps_unix_sock_path);
1427
1428 lttng_poll_clean(&events);
1429
1430 return NULL;
1431 }
1432
1433 /*
1434 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1435 * exec or it will fails.
1436 */
1437 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1438 {
1439 int ret;
1440 struct timespec timeout;
1441
1442 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1443 timeout.tv_nsec = 0;
1444
1445 /* Setup semaphore */
1446 ret = sem_init(&consumer_data->sem, 0, 0);
1447 if (ret < 0) {
1448 PERROR("sem_init consumer semaphore");
1449 goto error;
1450 }
1451
1452 ret = pthread_create(&consumer_data->thread, NULL,
1453 thread_manage_consumer, consumer_data);
1454 if (ret != 0) {
1455 PERROR("pthread_create consumer");
1456 ret = -1;
1457 goto error;
1458 }
1459
1460 /* Get time for sem_timedwait absolute timeout */
1461 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1462 if (ret < 0) {
1463 PERROR("clock_gettime spawn consumer");
1464 /* Infinite wait for the kconsumerd thread to be ready */
1465 ret = sem_wait(&consumer_data->sem);
1466 } else {
1467 /* Normal timeout if the gettime was successful */
1468 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1469 ret = sem_timedwait(&consumer_data->sem, &timeout);
1470 }
1471
1472 if (ret < 0) {
1473 if (errno == ETIMEDOUT) {
1474 /*
1475 * Call has timed out so we kill the kconsumerd_thread and return
1476 * an error.
1477 */
1478 ERR("The consumer thread was never ready. Killing it");
1479 ret = pthread_cancel(consumer_data->thread);
1480 if (ret < 0) {
1481 PERROR("pthread_cancel consumer thread");
1482 }
1483 } else {
1484 PERROR("semaphore wait failed consumer thread");
1485 }
1486 goto error;
1487 }
1488
1489 pthread_mutex_lock(&consumer_data->pid_mutex);
1490 if (consumer_data->pid == 0) {
1491 ERR("Kconsumerd did not start");
1492 pthread_mutex_unlock(&consumer_data->pid_mutex);
1493 goto error;
1494 }
1495 pthread_mutex_unlock(&consumer_data->pid_mutex);
1496
1497 return 0;
1498
1499 error:
1500 return ret;
1501 }
1502
1503 /*
1504 * Join consumer thread
1505 */
1506 static int join_consumer_thread(struct consumer_data *consumer_data)
1507 {
1508 void *status;
1509 int ret;
1510
1511 if (consumer_data->pid != 0) {
1512 ret = kill(consumer_data->pid, SIGTERM);
1513 if (ret) {
1514 ERR("Error killing consumer daemon");
1515 return ret;
1516 }
1517 return pthread_join(consumer_data->thread, &status);
1518 } else {
1519 return 0;
1520 }
1521 }
1522
1523 /*
1524 * Fork and exec a consumer daemon (consumerd).
1525 *
1526 * Return pid if successful else -1.
1527 */
1528 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1529 {
1530 int ret;
1531 pid_t pid;
1532 const char *consumer_to_use;
1533 const char *verbosity;
1534 struct stat st;
1535
1536 DBG("Spawning consumerd");
1537
1538 pid = fork();
1539 if (pid == 0) {
1540 /*
1541 * Exec consumerd.
1542 */
1543 if (opt_verbose_consumer) {
1544 verbosity = "--verbose";
1545 } else {
1546 verbosity = "--quiet";
1547 }
1548 switch (consumer_data->type) {
1549 case LTTNG_CONSUMER_KERNEL:
1550 /*
1551 * Find out which consumerd to execute. We will first try the
1552 * 64-bit path, then the sessiond's installation directory, and
1553 * fallback on the 32-bit one,
1554 */
1555 DBG3("Looking for a kernel consumer at these locations:");
1556 DBG3(" 1) %s", consumerd64_bin);
1557 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1558 DBG3(" 3) %s", consumerd32_bin);
1559 if (stat(consumerd64_bin, &st) == 0) {
1560 DBG3("Found location #1");
1561 consumer_to_use = consumerd64_bin;
1562 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1563 DBG3("Found location #2");
1564 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1565 } else if (stat(consumerd32_bin, &st) == 0) {
1566 DBG3("Found location #3");
1567 consumer_to_use = consumerd32_bin;
1568 } else {
1569 DBG("Could not find any valid consumerd executable");
1570 break;
1571 }
1572 DBG("Using kernel consumer at: %s", consumer_to_use);
1573 execl(consumer_to_use,
1574 "lttng-consumerd", verbosity, "-k",
1575 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1576 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1577 NULL);
1578 break;
1579 case LTTNG_CONSUMER64_UST:
1580 {
1581 char *tmpnew = NULL;
1582
1583 if (consumerd64_libdir[0] != '\0') {
1584 char *tmp;
1585 size_t tmplen;
1586
1587 tmp = getenv("LD_LIBRARY_PATH");
1588 if (!tmp) {
1589 tmp = "";
1590 }
1591 tmplen = strlen("LD_LIBRARY_PATH=")
1592 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1593 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1594 if (!tmpnew) {
1595 ret = -ENOMEM;
1596 goto error;
1597 }
1598 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1599 strcat(tmpnew, consumerd64_libdir);
1600 if (tmp[0] != '\0') {
1601 strcat(tmpnew, ":");
1602 strcat(tmpnew, tmp);
1603 }
1604 ret = putenv(tmpnew);
1605 if (ret) {
1606 ret = -errno;
1607 goto error;
1608 }
1609 }
1610 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1611 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1612 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1613 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1614 NULL);
1615 if (consumerd64_libdir[0] != '\0') {
1616 free(tmpnew);
1617 }
1618 if (ret) {
1619 goto error;
1620 }
1621 break;
1622 }
1623 case LTTNG_CONSUMER32_UST:
1624 {
1625 char *tmpnew = NULL;
1626
1627 if (consumerd32_libdir[0] != '\0') {
1628 char *tmp;
1629 size_t tmplen;
1630
1631 tmp = getenv("LD_LIBRARY_PATH");
1632 if (!tmp) {
1633 tmp = "";
1634 }
1635 tmplen = strlen("LD_LIBRARY_PATH=")
1636 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1637 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1638 if (!tmpnew) {
1639 ret = -ENOMEM;
1640 goto error;
1641 }
1642 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1643 strcat(tmpnew, consumerd32_libdir);
1644 if (tmp[0] != '\0') {
1645 strcat(tmpnew, ":");
1646 strcat(tmpnew, tmp);
1647 }
1648 ret = putenv(tmpnew);
1649 if (ret) {
1650 ret = -errno;
1651 goto error;
1652 }
1653 }
1654 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1655 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1656 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1657 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1658 NULL);
1659 if (consumerd32_libdir[0] != '\0') {
1660 free(tmpnew);
1661 }
1662 if (ret) {
1663 goto error;
1664 }
1665 break;
1666 }
1667 default:
1668 perror("unknown consumer type");
1669 exit(EXIT_FAILURE);
1670 }
1671 if (errno != 0) {
1672 perror("kernel start consumer exec");
1673 }
1674 exit(EXIT_FAILURE);
1675 } else if (pid > 0) {
1676 ret = pid;
1677 } else {
1678 perror("start consumer fork");
1679 ret = -errno;
1680 }
1681 error:
1682 return ret;
1683 }
1684
1685 /*
1686 * Spawn the consumerd daemon and session daemon thread.
1687 */
1688 static int start_consumerd(struct consumer_data *consumer_data)
1689 {
1690 int ret;
1691
1692 pthread_mutex_lock(&consumer_data->pid_mutex);
1693 if (consumer_data->pid != 0) {
1694 pthread_mutex_unlock(&consumer_data->pid_mutex);
1695 goto end;
1696 }
1697
1698 ret = spawn_consumerd(consumer_data);
1699 if (ret < 0) {
1700 ERR("Spawning consumerd failed");
1701 pthread_mutex_unlock(&consumer_data->pid_mutex);
1702 goto error;
1703 }
1704
1705 /* Setting up the consumer_data pid */
1706 consumer_data->pid = ret;
1707 DBG2("Consumer pid %d", consumer_data->pid);
1708 pthread_mutex_unlock(&consumer_data->pid_mutex);
1709
1710 DBG2("Spawning consumer control thread");
1711 ret = spawn_consumer_thread(consumer_data);
1712 if (ret < 0) {
1713 ERR("Fatal error spawning consumer control thread");
1714 goto error;
1715 }
1716
1717 end:
1718 return 0;
1719
1720 error:
1721 return ret;
1722 }
1723
1724 /*
1725 * Check version of the lttng-modules.
1726 */
1727 static int validate_lttng_modules_version(void)
1728 {
1729 return kernel_validate_version(kernel_tracer_fd);
1730 }
1731
1732 /*
1733 * Setup necessary data for kernel tracer action.
1734 */
1735 static int init_kernel_tracer(void)
1736 {
1737 int ret;
1738
1739 /* Modprobe lttng kernel modules */
1740 ret = modprobe_lttng_control();
1741 if (ret < 0) {
1742 goto error;
1743 }
1744
1745 /* Open debugfs lttng */
1746 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1747 if (kernel_tracer_fd < 0) {
1748 DBG("Failed to open %s", module_proc_lttng);
1749 ret = -1;
1750 goto error_open;
1751 }
1752
1753 /* Validate kernel version */
1754 ret = validate_lttng_modules_version();
1755 if (ret < 0) {
1756 goto error_version;
1757 }
1758
1759 ret = modprobe_lttng_data();
1760 if (ret < 0) {
1761 goto error_modules;
1762 }
1763
1764 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1765 return 0;
1766
1767 error_version:
1768 modprobe_remove_lttng_control();
1769 close(kernel_tracer_fd);
1770 kernel_tracer_fd = 0;
1771 return LTTCOMM_KERN_VERSION;
1772
1773 error_modules:
1774 close(kernel_tracer_fd);
1775
1776 error_open:
1777 modprobe_remove_lttng_control();
1778
1779 error:
1780 WARN("No kernel tracer available");
1781 kernel_tracer_fd = -1;
1782 return LTTCOMM_KERN_NA;
1783 }
1784
1785 /*
1786 * Init tracing by creating trace directory and sending fds kernel consumer.
1787 */
1788 static int init_kernel_tracing(struct ltt_kernel_session *session)
1789 {
1790 int ret = 0;
1791
1792 if (session->consumer_fds_sent == 0) {
1793 /*
1794 * Assign default kernel consumer socket if no consumer assigned to the
1795 * kernel session. At this point, it's NOT suppose to be 0 but this is
1796 * an extra security check.
1797 */
1798 if (session->consumer_fd == 0) {
1799 session->consumer_fd = kconsumer_data.cmd_sock;
1800 }
1801
1802 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1803 if (ret < 0) {
1804 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1805 goto error;
1806 }
1807
1808 session->consumer_fds_sent = 1;
1809 }
1810
1811 error:
1812 return ret;
1813 }
1814
1815 /*
1816 * Create an UST session and add it to the session ust list.
1817 */
1818 static int create_ust_session(struct ltt_session *session,
1819 struct lttng_domain *domain)
1820 {
1821 struct ltt_ust_session *lus = NULL;
1822 int ret;
1823
1824 switch (domain->type) {
1825 case LTTNG_DOMAIN_UST:
1826 break;
1827 default:
1828 ret = LTTCOMM_UNKNOWN_DOMAIN;
1829 goto error;
1830 }
1831
1832 DBG("Creating UST session");
1833
1834 lus = trace_ust_create_session(session->path, session->id, domain);
1835 if (lus == NULL) {
1836 ret = LTTCOMM_UST_SESS_FAIL;
1837 goto error;
1838 }
1839
1840 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1841 session->uid, session->gid);
1842 if (ret < 0) {
1843 if (ret != -EEXIST) {
1844 ERR("Trace directory creation error");
1845 ret = LTTCOMM_UST_SESS_FAIL;
1846 goto error;
1847 }
1848 }
1849
1850 /* The domain type dictate different actions on session creation */
1851 switch (domain->type) {
1852 case LTTNG_DOMAIN_UST:
1853 /* No ustctl for the global UST domain */
1854 break;
1855 default:
1856 ERR("Unknown UST domain on create session %d", domain->type);
1857 goto error;
1858 }
1859 lus->uid = session->uid;
1860 lus->gid = session->gid;
1861 session->ust_session = lus;
1862
1863 return LTTCOMM_OK;
1864
1865 error:
1866 free(lus);
1867 return ret;
1868 }
1869
1870 /*
1871 * Create a kernel tracer session then create the default channel.
1872 */
1873 static int create_kernel_session(struct ltt_session *session)
1874 {
1875 int ret;
1876
1877 DBG("Creating kernel session");
1878
1879 ret = kernel_create_session(session, kernel_tracer_fd);
1880 if (ret < 0) {
1881 ret = LTTCOMM_KERN_SESS_FAIL;
1882 goto error;
1883 }
1884
1885 /* Set kernel consumer socket fd */
1886 if (kconsumer_data.cmd_sock) {
1887 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1888 }
1889
1890 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1891 S_IRWXU | S_IRWXG, session->uid, session->gid);
1892 if (ret < 0) {
1893 if (ret != -EEXIST) {
1894 ERR("Trace directory creation error");
1895 goto error;
1896 }
1897 }
1898 session->kernel_session->uid = session->uid;
1899 session->kernel_session->gid = session->gid;
1900
1901 error:
1902 return ret;
1903 }
1904
1905 /*
1906 * Check if the UID or GID match the session. Root user has access to all
1907 * sessions.
1908 */
1909 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1910 {
1911 if (uid != session->uid && gid != session->gid && uid != 0) {
1912 return 0;
1913 } else {
1914 return 1;
1915 }
1916 }
1917
1918 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1919 {
1920 unsigned int i = 0;
1921 struct ltt_session *session;
1922
1923 DBG("Counting number of available session for UID %d GID %d",
1924 uid, gid);
1925 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1926 /*
1927 * Only list the sessions the user can control.
1928 */
1929 if (!session_access_ok(session, uid, gid)) {
1930 continue;
1931 }
1932 i++;
1933 }
1934 return i;
1935 }
1936
1937 /*
1938 * Using the session list, filled a lttng_session array to send back to the
1939 * client for session listing.
1940 *
1941 * The session list lock MUST be acquired before calling this function. Use
1942 * session_lock_list() and session_unlock_list().
1943 */
1944 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1945 gid_t gid)
1946 {
1947 unsigned int i = 0;
1948 struct ltt_session *session;
1949
1950 DBG("Getting all available session for UID %d GID %d",
1951 uid, gid);
1952 /*
1953 * Iterate over session list and append data after the control struct in
1954 * the buffer.
1955 */
1956 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1957 /*
1958 * Only list the sessions the user can control.
1959 */
1960 if (!session_access_ok(session, uid, gid)) {
1961 continue;
1962 }
1963 strncpy(sessions[i].path, session->path, PATH_MAX);
1964 sessions[i].path[PATH_MAX - 1] = '\0';
1965 strncpy(sessions[i].name, session->name, NAME_MAX);
1966 sessions[i].name[NAME_MAX - 1] = '\0';
1967 sessions[i].enabled = session->enabled;
1968 i++;
1969 }
1970 }
1971
1972 /*
1973 * Fill lttng_channel array of all channels.
1974 */
1975 static void list_lttng_channels(int domain, struct ltt_session *session,
1976 struct lttng_channel *channels)
1977 {
1978 int i = 0;
1979 struct ltt_kernel_channel *kchan;
1980
1981 DBG("Listing channels for session %s", session->name);
1982
1983 switch (domain) {
1984 case LTTNG_DOMAIN_KERNEL:
1985 /* Kernel channels */
1986 if (session->kernel_session != NULL) {
1987 cds_list_for_each_entry(kchan,
1988 &session->kernel_session->channel_list.head, list) {
1989 /* Copy lttng_channel struct to array */
1990 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1991 channels[i].enabled = kchan->enabled;
1992 i++;
1993 }
1994 }
1995 break;
1996 case LTTNG_DOMAIN_UST:
1997 {
1998 struct lttng_ht_iter iter;
1999 struct ltt_ust_channel *uchan;
2000
2001 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2002 &iter.iter, uchan, node.node) {
2003 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2004 channels[i].attr.overwrite = uchan->attr.overwrite;
2005 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2006 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2007 channels[i].attr.switch_timer_interval =
2008 uchan->attr.switch_timer_interval;
2009 channels[i].attr.read_timer_interval =
2010 uchan->attr.read_timer_interval;
2011 channels[i].enabled = uchan->enabled;
2012 switch (uchan->attr.output) {
2013 case LTTNG_UST_MMAP:
2014 default:
2015 channels[i].attr.output = LTTNG_EVENT_MMAP;
2016 break;
2017 }
2018 i++;
2019 }
2020 break;
2021 }
2022 default:
2023 break;
2024 }
2025 }
2026
2027 /*
2028 * Create a list of ust global domain events.
2029 */
2030 static int list_lttng_ust_global_events(char *channel_name,
2031 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2032 {
2033 int i = 0, ret = 0;
2034 unsigned int nb_event = 0;
2035 struct lttng_ht_iter iter;
2036 struct lttng_ht_node_str *node;
2037 struct ltt_ust_channel *uchan;
2038 struct ltt_ust_event *uevent;
2039 struct lttng_event *tmp;
2040
2041 DBG("Listing UST global events for channel %s", channel_name);
2042
2043 rcu_read_lock();
2044
2045 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2046 node = lttng_ht_iter_get_node_str(&iter);
2047 if (node == NULL) {
2048 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2049 goto error;
2050 }
2051
2052 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2053
2054 nb_event += lttng_ht_get_count(uchan->events);
2055
2056 if (nb_event == 0) {
2057 ret = nb_event;
2058 goto error;
2059 }
2060
2061 DBG3("Listing UST global %d events", nb_event);
2062
2063 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2064 if (tmp == NULL) {
2065 ret = -LTTCOMM_FATAL;
2066 goto error;
2067 }
2068
2069 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2070 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2071 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2072 tmp[i].enabled = uevent->enabled;
2073 switch (uevent->attr.instrumentation) {
2074 case LTTNG_UST_TRACEPOINT:
2075 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2076 break;
2077 case LTTNG_UST_PROBE:
2078 tmp[i].type = LTTNG_EVENT_PROBE;
2079 break;
2080 case LTTNG_UST_FUNCTION:
2081 tmp[i].type = LTTNG_EVENT_FUNCTION;
2082 break;
2083 }
2084 tmp[i].loglevel = uevent->attr.loglevel;
2085 switch (uevent->attr.loglevel_type) {
2086 case LTTNG_UST_LOGLEVEL_ALL:
2087 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2088 break;
2089 case LTTNG_UST_LOGLEVEL_RANGE:
2090 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2091 break;
2092 case LTTNG_UST_LOGLEVEL_SINGLE:
2093 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2094 break;
2095 }
2096 i++;
2097 }
2098
2099 ret = nb_event;
2100 *events = tmp;
2101
2102 error:
2103 rcu_read_unlock();
2104 return ret;
2105 }
2106
2107 /*
2108 * Fill lttng_event array of all kernel events in the channel.
2109 */
2110 static int list_lttng_kernel_events(char *channel_name,
2111 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2112 {
2113 int i = 0, ret;
2114 unsigned int nb_event;
2115 struct ltt_kernel_event *event;
2116 struct ltt_kernel_channel *kchan;
2117
2118 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2119 if (kchan == NULL) {
2120 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2121 goto error;
2122 }
2123
2124 nb_event = kchan->event_count;
2125
2126 DBG("Listing events for channel %s", kchan->channel->name);
2127
2128 if (nb_event == 0) {
2129 ret = nb_event;
2130 goto error;
2131 }
2132
2133 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2134 if (*events == NULL) {
2135 ret = LTTCOMM_FATAL;
2136 goto error;
2137 }
2138
2139 /* Kernel channels */
2140 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2141 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2142 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2143 (*events)[i].enabled = event->enabled;
2144 switch (event->event->instrumentation) {
2145 case LTTNG_KERNEL_TRACEPOINT:
2146 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2147 break;
2148 case LTTNG_KERNEL_KPROBE:
2149 case LTTNG_KERNEL_KRETPROBE:
2150 (*events)[i].type = LTTNG_EVENT_PROBE;
2151 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2152 sizeof(struct lttng_kernel_kprobe));
2153 break;
2154 case LTTNG_KERNEL_FUNCTION:
2155 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2156 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2157 sizeof(struct lttng_kernel_function));
2158 break;
2159 case LTTNG_KERNEL_NOOP:
2160 (*events)[i].type = LTTNG_EVENT_NOOP;
2161 break;
2162 case LTTNG_KERNEL_SYSCALL:
2163 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2164 break;
2165 case LTTNG_KERNEL_ALL:
2166 assert(0);
2167 break;
2168 }
2169 i++;
2170 }
2171
2172 return nb_event;
2173
2174 error:
2175 return ret;
2176 }
2177
2178 /*
2179 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2180 */
2181 static int cmd_disable_channel(struct ltt_session *session,
2182 int domain, char *channel_name)
2183 {
2184 int ret;
2185 struct ltt_ust_session *usess;
2186
2187 usess = session->ust_session;
2188
2189 switch (domain) {
2190 case LTTNG_DOMAIN_KERNEL:
2191 {
2192 ret = channel_kernel_disable(session->kernel_session,
2193 channel_name);
2194 if (ret != LTTCOMM_OK) {
2195 goto error;
2196 }
2197
2198 kernel_wait_quiescent(kernel_tracer_fd);
2199 break;
2200 }
2201 case LTTNG_DOMAIN_UST:
2202 {
2203 struct ltt_ust_channel *uchan;
2204 struct lttng_ht *chan_ht;
2205
2206 chan_ht = usess->domain_global.channels;
2207
2208 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2209 if (uchan == NULL) {
2210 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2211 goto error;
2212 }
2213
2214 ret = channel_ust_disable(usess, domain, uchan);
2215 if (ret != LTTCOMM_OK) {
2216 goto error;
2217 }
2218 break;
2219 }
2220 #if 0
2221 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2222 case LTTNG_DOMAIN_UST_EXEC_NAME:
2223 case LTTNG_DOMAIN_UST_PID:
2224 #endif
2225 default:
2226 ret = LTTCOMM_UNKNOWN_DOMAIN;
2227 goto error;
2228 }
2229
2230 ret = LTTCOMM_OK;
2231
2232 error:
2233 return ret;
2234 }
2235
2236 /*
2237 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2238 */
2239 static int cmd_enable_channel(struct ltt_session *session,
2240 int domain, struct lttng_channel *attr)
2241 {
2242 int ret;
2243 struct ltt_ust_session *usess = session->ust_session;
2244 struct lttng_ht *chan_ht;
2245
2246 DBG("Enabling channel %s for session %s", attr->name, session->name);
2247
2248 switch (domain) {
2249 case LTTNG_DOMAIN_KERNEL:
2250 {
2251 struct ltt_kernel_channel *kchan;
2252
2253 kchan = trace_kernel_get_channel_by_name(attr->name,
2254 session->kernel_session);
2255 if (kchan == NULL) {
2256 ret = channel_kernel_create(session->kernel_session,
2257 attr, kernel_poll_pipe[1]);
2258 } else {
2259 ret = channel_kernel_enable(session->kernel_session, kchan);
2260 }
2261
2262 if (ret != LTTCOMM_OK) {
2263 goto error;
2264 }
2265
2266 kernel_wait_quiescent(kernel_tracer_fd);
2267 break;
2268 }
2269 case LTTNG_DOMAIN_UST:
2270 {
2271 struct ltt_ust_channel *uchan;
2272
2273 chan_ht = usess->domain_global.channels;
2274
2275 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2276 if (uchan == NULL) {
2277 ret = channel_ust_create(usess, domain, attr);
2278 } else {
2279 ret = channel_ust_enable(usess, domain, uchan);
2280 }
2281 break;
2282 }
2283 #if 0
2284 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2285 case LTTNG_DOMAIN_UST_EXEC_NAME:
2286 case LTTNG_DOMAIN_UST_PID:
2287 #endif
2288 default:
2289 ret = LTTCOMM_UNKNOWN_DOMAIN;
2290 goto error;
2291 }
2292
2293 error:
2294 return ret;
2295 }
2296
2297 /*
2298 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2299 */
2300 static int cmd_disable_event(struct ltt_session *session, int domain,
2301 char *channel_name, char *event_name)
2302 {
2303 int ret;
2304
2305 switch (domain) {
2306 case LTTNG_DOMAIN_KERNEL:
2307 {
2308 struct ltt_kernel_channel *kchan;
2309 struct ltt_kernel_session *ksess;
2310
2311 ksess = session->kernel_session;
2312
2313 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2314 if (kchan == NULL) {
2315 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2316 goto error;
2317 }
2318
2319 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2320 if (ret != LTTCOMM_OK) {
2321 goto error;
2322 }
2323
2324 kernel_wait_quiescent(kernel_tracer_fd);
2325 break;
2326 }
2327 case LTTNG_DOMAIN_UST:
2328 {
2329 struct ltt_ust_channel *uchan;
2330 struct ltt_ust_session *usess;
2331
2332 usess = session->ust_session;
2333
2334 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2335 channel_name);
2336 if (uchan == NULL) {
2337 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2338 goto error;
2339 }
2340
2341 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2342 if (ret != LTTCOMM_OK) {
2343 goto error;
2344 }
2345
2346 DBG3("Disable UST event %s in channel %s completed", event_name,
2347 channel_name);
2348 break;
2349 }
2350 #if 0
2351 case LTTNG_DOMAIN_UST_EXEC_NAME:
2352 case LTTNG_DOMAIN_UST_PID:
2353 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2354 #endif
2355 default:
2356 ret = LTTCOMM_UND;
2357 goto error;
2358 }
2359
2360 ret = LTTCOMM_OK;
2361
2362 error:
2363 return ret;
2364 }
2365
2366 /*
2367 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2368 */
2369 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2370 char *channel_name)
2371 {
2372 int ret;
2373
2374 switch (domain) {
2375 case LTTNG_DOMAIN_KERNEL:
2376 {
2377 struct ltt_kernel_session *ksess;
2378 struct ltt_kernel_channel *kchan;
2379
2380 ksess = session->kernel_session;
2381
2382 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2383 if (kchan == NULL) {
2384 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2385 goto error;
2386 }
2387
2388 ret = event_kernel_disable_all(ksess, kchan);
2389 if (ret != LTTCOMM_OK) {
2390 goto error;
2391 }
2392
2393 kernel_wait_quiescent(kernel_tracer_fd);
2394 break;
2395 }
2396 case LTTNG_DOMAIN_UST:
2397 {
2398 struct ltt_ust_session *usess;
2399 struct ltt_ust_channel *uchan;
2400
2401 usess = session->ust_session;
2402
2403 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2404 channel_name);
2405 if (uchan == NULL) {
2406 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2407 goto error;
2408 }
2409
2410 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2411 if (ret != 0) {
2412 goto error;
2413 }
2414
2415 DBG3("Disable all UST events in channel %s completed", channel_name);
2416
2417 break;
2418 }
2419 #if 0
2420 case LTTNG_DOMAIN_UST_EXEC_NAME:
2421 case LTTNG_DOMAIN_UST_PID:
2422 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2423 #endif
2424 default:
2425 ret = LTTCOMM_UND;
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 #if 0
2463 case LTTNG_DOMAIN_UST_EXEC_NAME:
2464 case LTTNG_DOMAIN_UST_PID:
2465 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2466 #endif
2467 default:
2468 ret = LTTCOMM_UND;
2469 goto error;
2470 }
2471
2472 ret = LTTCOMM_OK;
2473
2474 error:
2475 return ret;
2476 }
2477
2478 /*
2479 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2480 */
2481 static int cmd_enable_event(struct ltt_session *session, int domain,
2482 char *channel_name, struct lttng_event *event)
2483 {
2484 int ret;
2485 struct lttng_channel *attr;
2486 struct ltt_ust_session *usess = session->ust_session;
2487
2488 switch (domain) {
2489 case LTTNG_DOMAIN_KERNEL:
2490 {
2491 struct ltt_kernel_channel *kchan;
2492
2493 kchan = trace_kernel_get_channel_by_name(channel_name,
2494 session->kernel_session);
2495 if (kchan == NULL) {
2496 attr = channel_new_default_attr(domain);
2497 if (attr == NULL) {
2498 ret = LTTCOMM_FATAL;
2499 goto error;
2500 }
2501 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2502
2503 /* This call will notify the kernel thread */
2504 ret = channel_kernel_create(session->kernel_session,
2505 attr, kernel_poll_pipe[1]);
2506 if (ret != LTTCOMM_OK) {
2507 free(attr);
2508 goto error;
2509 }
2510 free(attr);
2511 }
2512
2513 /* Get the newly created kernel channel pointer */
2514 kchan = trace_kernel_get_channel_by_name(channel_name,
2515 session->kernel_session);
2516 if (kchan == NULL) {
2517 /* This sould not happen... */
2518 ret = LTTCOMM_FATAL;
2519 goto error;
2520 }
2521
2522 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2523 event);
2524 if (ret != LTTCOMM_OK) {
2525 goto error;
2526 }
2527
2528 kernel_wait_quiescent(kernel_tracer_fd);
2529 break;
2530 }
2531 case LTTNG_DOMAIN_UST:
2532 {
2533 struct lttng_channel *attr;
2534 struct ltt_ust_channel *uchan;
2535
2536 /* Get channel from global UST domain */
2537 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2538 channel_name);
2539 if (uchan == NULL) {
2540 /* Create default channel */
2541 attr = channel_new_default_attr(domain);
2542 if (attr == NULL) {
2543 ret = LTTCOMM_FATAL;
2544 goto error;
2545 }
2546 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2547 attr->name[NAME_MAX - 1] = '\0';
2548
2549 ret = channel_ust_create(usess, domain, attr);
2550 if (ret != LTTCOMM_OK) {
2551 free(attr);
2552 goto error;
2553 }
2554 free(attr);
2555
2556 /* Get the newly created channel reference back */
2557 uchan = trace_ust_find_channel_by_name(
2558 usess->domain_global.channels, channel_name);
2559 if (uchan == NULL) {
2560 /* Something is really wrong */
2561 ret = LTTCOMM_FATAL;
2562 goto error;
2563 }
2564 }
2565
2566 /* At this point, the session and channel exist on the tracer */
2567 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2568 if (ret != LTTCOMM_OK) {
2569 goto error;
2570 }
2571 break;
2572 }
2573 #if 0
2574 case LTTNG_DOMAIN_UST_EXEC_NAME:
2575 case LTTNG_DOMAIN_UST_PID:
2576 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2577 #endif
2578 default:
2579 ret = LTTCOMM_UND;
2580 goto error;
2581 }
2582
2583 ret = LTTCOMM_OK;
2584
2585 error:
2586 return ret;
2587 }
2588
2589 /*
2590 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2591 */
2592 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2593 char *channel_name, int event_type)
2594 {
2595 int ret;
2596 struct ltt_kernel_channel *kchan;
2597
2598 switch (domain) {
2599 case LTTNG_DOMAIN_KERNEL:
2600 kchan = trace_kernel_get_channel_by_name(channel_name,
2601 session->kernel_session);
2602 if (kchan == NULL) {
2603 /* This call will notify the kernel thread */
2604 ret = channel_kernel_create(session->kernel_session, NULL,
2605 kernel_poll_pipe[1]);
2606 if (ret != LTTCOMM_OK) {
2607 goto error;
2608 }
2609
2610 /* Get the newly created kernel channel pointer */
2611 kchan = trace_kernel_get_channel_by_name(channel_name,
2612 session->kernel_session);
2613 if (kchan == NULL) {
2614 /* This sould not happen... */
2615 ret = LTTCOMM_FATAL;
2616 goto error;
2617 }
2618
2619 }
2620
2621 switch (event_type) {
2622 case LTTNG_EVENT_SYSCALL:
2623 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2624 kchan, kernel_tracer_fd);
2625 break;
2626 case LTTNG_EVENT_TRACEPOINT:
2627 /*
2628 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2629 * events already registered to the channel.
2630 */
2631 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2632 kchan, kernel_tracer_fd);
2633 break;
2634 case LTTNG_EVENT_ALL:
2635 /* Enable syscalls and tracepoints */
2636 ret = event_kernel_enable_all(session->kernel_session,
2637 kchan, kernel_tracer_fd);
2638 break;
2639 default:
2640 ret = LTTCOMM_KERN_ENABLE_FAIL;
2641 goto error;
2642 }
2643
2644 /* Manage return value */
2645 if (ret != LTTCOMM_OK) {
2646 goto error;
2647 }
2648
2649 kernel_wait_quiescent(kernel_tracer_fd);
2650 break;
2651 case LTTNG_DOMAIN_UST:
2652 {
2653 struct lttng_channel *attr;
2654 struct ltt_ust_channel *uchan;
2655 struct ltt_ust_session *usess = session->ust_session;
2656
2657 /* Get channel from global UST domain */
2658 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2659 channel_name);
2660 if (uchan == NULL) {
2661 /* Create default channel */
2662 attr = channel_new_default_attr(domain);
2663 if (attr == NULL) {
2664 ret = LTTCOMM_FATAL;
2665 goto error;
2666 }
2667 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2668 attr->name[NAME_MAX - 1] = '\0';
2669
2670 /* Use the internal command enable channel */
2671 ret = channel_ust_create(usess, domain, attr);
2672 if (ret != LTTCOMM_OK) {
2673 free(attr);
2674 goto error;
2675 }
2676 free(attr);
2677
2678 /* Get the newly created channel reference back */
2679 uchan = trace_ust_find_channel_by_name(
2680 usess->domain_global.channels, channel_name);
2681 if (uchan == NULL) {
2682 /* Something is really wrong */
2683 ret = LTTCOMM_FATAL;
2684 goto error;
2685 }
2686 }
2687
2688 /* At this point, the session and channel exist on the tracer */
2689
2690 switch (event_type) {
2691 case LTTNG_EVENT_ALL:
2692 case LTTNG_EVENT_TRACEPOINT:
2693 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2694 if (ret != LTTCOMM_OK) {
2695 goto error;
2696 }
2697 break;
2698 default:
2699 ret = LTTCOMM_UST_ENABLE_FAIL;
2700 goto error;
2701 }
2702
2703 /* Manage return value */
2704 if (ret != LTTCOMM_OK) {
2705 goto error;
2706 }
2707
2708 break;
2709 }
2710 #if 0
2711 case LTTNG_DOMAIN_UST_EXEC_NAME:
2712 case LTTNG_DOMAIN_UST_PID:
2713 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2714 #endif
2715 default:
2716 ret = LTTCOMM_UND;
2717 goto error;
2718 }
2719
2720 ret = LTTCOMM_OK;
2721
2722 error:
2723 return ret;
2724 }
2725
2726 /*
2727 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2728 */
2729 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2730 {
2731 int ret;
2732 ssize_t nb_events = 0;
2733
2734 switch (domain) {
2735 case LTTNG_DOMAIN_KERNEL:
2736 nb_events = kernel_list_events(kernel_tracer_fd, events);
2737 if (nb_events < 0) {
2738 ret = LTTCOMM_KERN_LIST_FAIL;
2739 goto error;
2740 }
2741 break;
2742 case LTTNG_DOMAIN_UST:
2743 nb_events = ust_app_list_events(events);
2744 if (nb_events < 0) {
2745 ret = LTTCOMM_UST_LIST_FAIL;
2746 goto error;
2747 }
2748 break;
2749 default:
2750 ret = LTTCOMM_UND;
2751 goto error;
2752 }
2753
2754 return nb_events;
2755
2756 error:
2757 /* Return negative value to differentiate return code */
2758 return -ret;
2759 }
2760
2761 /*
2762 * Command LTTNG_START_TRACE processed by the client thread.
2763 */
2764 static int cmd_start_trace(struct ltt_session *session)
2765 {
2766 int ret;
2767 struct ltt_kernel_session *ksession;
2768 struct ltt_ust_session *usess;
2769
2770 /* Short cut */
2771 ksession = session->kernel_session;
2772 usess = session->ust_session;
2773
2774 if (session->enabled) {
2775 ret = LTTCOMM_UST_START_FAIL;
2776 goto error;
2777 }
2778
2779 session->enabled = 1;
2780
2781 /* Kernel tracing */
2782 if (ksession != NULL) {
2783 struct ltt_kernel_channel *kchan;
2784
2785 /* Open kernel metadata */
2786 if (ksession->metadata == NULL) {
2787 ret = kernel_open_metadata(ksession, ksession->trace_path);
2788 if (ret < 0) {
2789 ret = LTTCOMM_KERN_META_FAIL;
2790 goto error;
2791 }
2792 }
2793
2794 /* Open kernel metadata stream */
2795 if (ksession->metadata_stream_fd == 0) {
2796 ret = kernel_open_metadata_stream(ksession);
2797 if (ret < 0) {
2798 ERR("Kernel create metadata stream failed");
2799 ret = LTTCOMM_KERN_STREAM_FAIL;
2800 goto error;
2801 }
2802 }
2803
2804 /* For each channel */
2805 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2806 if (kchan->stream_count == 0) {
2807 ret = kernel_open_channel_stream(kchan);
2808 if (ret < 0) {
2809 ret = LTTCOMM_KERN_STREAM_FAIL;
2810 goto error;
2811 }
2812 /* Update the stream global counter */
2813 ksession->stream_count_global += ret;
2814 }
2815 }
2816
2817 /* Setup kernel consumer socket and send fds to it */
2818 ret = init_kernel_tracing(ksession);
2819 if (ret < 0) {
2820 ret = LTTCOMM_KERN_START_FAIL;
2821 goto error;
2822 }
2823
2824 /* This start the kernel tracing */
2825 ret = kernel_start_session(ksession);
2826 if (ret < 0) {
2827 ret = LTTCOMM_KERN_START_FAIL;
2828 goto error;
2829 }
2830
2831 /* Quiescent wait after starting trace */
2832 kernel_wait_quiescent(kernel_tracer_fd);
2833 }
2834
2835 /* Flag session that trace should start automatically */
2836 if (usess) {
2837 usess->start_trace = 1;
2838
2839 ret = ust_app_start_trace_all(usess);
2840 if (ret < 0) {
2841 ret = LTTCOMM_UST_START_FAIL;
2842 goto error;
2843 }
2844 }
2845
2846 ret = LTTCOMM_OK;
2847
2848 error:
2849 return ret;
2850 }
2851
2852 /*
2853 * Command LTTNG_STOP_TRACE processed by the client thread.
2854 */
2855 static int cmd_stop_trace(struct ltt_session *session)
2856 {
2857 int ret;
2858 struct ltt_kernel_channel *kchan;
2859 struct ltt_kernel_session *ksession;
2860 struct ltt_ust_session *usess;
2861
2862 /* Short cut */
2863 ksession = session->kernel_session;
2864 usess = session->ust_session;
2865
2866 if (!session->enabled) {
2867 ret = LTTCOMM_UST_STOP_FAIL;
2868 goto error;
2869 }
2870
2871 session->enabled = 0;
2872
2873 /* Kernel tracer */
2874 if (ksession != NULL) {
2875 DBG("Stop kernel tracing");
2876
2877 /* Flush all buffers before stopping */
2878 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2879 if (ret < 0) {
2880 ERR("Kernel metadata flush failed");
2881 }
2882
2883 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2884 ret = kernel_flush_buffer(kchan);
2885 if (ret < 0) {
2886 ERR("Kernel flush buffer error");
2887 }
2888 }
2889
2890 ret = kernel_stop_session(ksession);
2891 if (ret < 0) {
2892 ret = LTTCOMM_KERN_STOP_FAIL;
2893 goto error;
2894 }
2895
2896 kernel_wait_quiescent(kernel_tracer_fd);
2897 }
2898
2899 if (usess) {
2900 usess->start_trace = 0;
2901
2902 ret = ust_app_stop_trace_all(usess);
2903 if (ret < 0) {
2904 ret = LTTCOMM_UST_STOP_FAIL;
2905 goto error;
2906 }
2907 }
2908
2909 ret = LTTCOMM_OK;
2910
2911 error:
2912 return ret;
2913 }
2914
2915 /*
2916 * Command LTTNG_CREATE_SESSION processed by the client thread.
2917 */
2918 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2919 {
2920 int ret;
2921
2922 ret = session_create(name, path, creds->uid, creds->gid);
2923 if (ret != LTTCOMM_OK) {
2924 goto error;
2925 }
2926
2927 ret = LTTCOMM_OK;
2928
2929 error:
2930 return ret;
2931 }
2932
2933 /*
2934 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2935 */
2936 static int cmd_destroy_session(struct ltt_session *session, char *name)
2937 {
2938 int ret;
2939
2940 /* Clean kernel session teardown */
2941 teardown_kernel_session(session);
2942 /* UST session teardown */
2943 teardown_ust_session(session);
2944
2945 /*
2946 * Must notify the kernel thread here to update it's poll setin order
2947 * to remove the channel(s)' fd just destroyed.
2948 */
2949 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2950 if (ret < 0) {
2951 perror("write kernel poll pipe");
2952 }
2953
2954 ret = session_destroy(session);
2955
2956 return ret;
2957 }
2958
2959 /*
2960 * Command LTTNG_CALIBRATE processed by the client thread.
2961 */
2962 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2963 {
2964 int ret;
2965
2966 switch (domain) {
2967 case LTTNG_DOMAIN_KERNEL:
2968 {
2969 struct lttng_kernel_calibrate kcalibrate;
2970
2971 kcalibrate.type = calibrate->type;
2972 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2973 if (ret < 0) {
2974 ret = LTTCOMM_KERN_ENABLE_FAIL;
2975 goto error;
2976 }
2977 break;
2978 }
2979 case LTTNG_DOMAIN_UST:
2980 {
2981 struct lttng_ust_calibrate ucalibrate;
2982
2983 ucalibrate.type = calibrate->type;
2984 ret = ust_app_calibrate_glb(&ucalibrate);
2985 if (ret < 0) {
2986 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2987 goto error;
2988 }
2989 break;
2990 }
2991 default:
2992 ret = LTTCOMM_UND;
2993 goto error;
2994 }
2995
2996 ret = LTTCOMM_OK;
2997
2998 error:
2999 return ret;
3000 }
3001
3002 /*
3003 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3004 */
3005 static int cmd_register_consumer(struct ltt_session *session, int domain,
3006 char *sock_path)
3007 {
3008 int ret, sock;
3009
3010 switch (domain) {
3011 case LTTNG_DOMAIN_KERNEL:
3012 /* Can't register a consumer if there is already one */
3013 if (session->kernel_session->consumer_fds_sent != 0) {
3014 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3015 goto error;
3016 }
3017
3018 sock = lttcomm_connect_unix_sock(sock_path);
3019 if (sock < 0) {
3020 ret = LTTCOMM_CONNECT_FAIL;
3021 goto error;
3022 }
3023
3024 session->kernel_session->consumer_fd = sock;
3025 break;
3026 default:
3027 /* TODO: Userspace tracing */
3028 ret = LTTCOMM_UND;
3029 goto error;
3030 }
3031
3032 ret = LTTCOMM_OK;
3033
3034 error:
3035 return ret;
3036 }
3037
3038 /*
3039 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3040 */
3041 static ssize_t cmd_list_domains(struct ltt_session *session,
3042 struct lttng_domain **domains)
3043 {
3044 int ret, index = 0;
3045 ssize_t nb_dom = 0;
3046
3047 if (session->kernel_session != NULL) {
3048 DBG3("Listing domains found kernel domain");
3049 nb_dom++;
3050 }
3051
3052 if (session->ust_session != NULL) {
3053 DBG3("Listing domains found UST global domain");
3054 nb_dom++;
3055 }
3056
3057 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3058 if (*domains == NULL) {
3059 ret = -LTTCOMM_FATAL;
3060 goto error;
3061 }
3062
3063 if (session->kernel_session != NULL) {
3064 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3065 index++;
3066 }
3067
3068 if (session->ust_session != NULL) {
3069 (*domains)[index].type = LTTNG_DOMAIN_UST;
3070 index++;
3071 }
3072
3073 return nb_dom;
3074
3075 error:
3076 return ret;
3077 }
3078
3079 /*
3080 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3081 */
3082 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3083 struct lttng_channel **channels)
3084 {
3085 int ret;
3086 ssize_t nb_chan = 0;
3087
3088 switch (domain) {
3089 case LTTNG_DOMAIN_KERNEL:
3090 if (session->kernel_session != NULL) {
3091 nb_chan = session->kernel_session->channel_count;
3092 }
3093 DBG3("Number of kernel channels %zd", nb_chan);
3094 break;
3095 case LTTNG_DOMAIN_UST:
3096 if (session->ust_session != NULL) {
3097 nb_chan = lttng_ht_get_count(
3098 session->ust_session->domain_global.channels);
3099 }
3100 DBG3("Number of UST global channels %zd", nb_chan);
3101 break;
3102 default:
3103 *channels = NULL;
3104 ret = -LTTCOMM_UND;
3105 goto error;
3106 }
3107
3108 if (nb_chan > 0) {
3109 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3110 if (*channels == NULL) {
3111 ret = -LTTCOMM_FATAL;
3112 goto error;
3113 }
3114
3115 list_lttng_channels(domain, session, *channels);
3116 } else {
3117 *channels = NULL;
3118 }
3119
3120 return nb_chan;
3121
3122 error:
3123 return ret;
3124 }
3125
3126 /*
3127 * Command LTTNG_LIST_EVENTS processed by the client thread.
3128 */
3129 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3130 char *channel_name, struct lttng_event **events)
3131 {
3132 int ret = 0;
3133 ssize_t nb_event = 0;
3134
3135 switch (domain) {
3136 case LTTNG_DOMAIN_KERNEL:
3137 if (session->kernel_session != NULL) {
3138 nb_event = list_lttng_kernel_events(channel_name,
3139 session->kernel_session, events);
3140 }
3141 break;
3142 case LTTNG_DOMAIN_UST:
3143 {
3144 if (session->ust_session != NULL) {
3145 nb_event = list_lttng_ust_global_events(channel_name,
3146 &session->ust_session->domain_global, events);
3147 }
3148 break;
3149 }
3150 default:
3151 ret = -LTTCOMM_UND;
3152 goto error;
3153 }
3154
3155 ret = nb_event;
3156
3157 error:
3158 return ret;
3159 }
3160
3161 /*
3162 * Process the command requested by the lttng client within the command
3163 * context structure. This function make sure that the return structure (llm)
3164 * is set and ready for transmission before returning.
3165 *
3166 * Return any error encountered or 0 for success.
3167 */
3168 static int process_client_msg(struct command_ctx *cmd_ctx)
3169 {
3170 int ret = LTTCOMM_OK;
3171 int need_tracing_session = 1;
3172 int need_domain;
3173
3174 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3175
3176 switch (cmd_ctx->lsm->cmd_type) {
3177 case LTTNG_CREATE_SESSION:
3178 case LTTNG_DESTROY_SESSION:
3179 case LTTNG_LIST_SESSIONS:
3180 case LTTNG_LIST_DOMAINS:
3181 case LTTNG_START_TRACE:
3182 case LTTNG_STOP_TRACE:
3183 need_domain = 0;
3184 break;
3185 default:
3186 need_domain = 1;
3187 }
3188
3189 if (opt_no_kernel && need_domain
3190 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3191 ret = LTTCOMM_KERN_NA;
3192 goto error;
3193 }
3194
3195 /*
3196 * Check for command that don't needs to allocate a returned payload. We do
3197 * this here so we don't have to make the call for no payload at each
3198 * command.
3199 */
3200 switch(cmd_ctx->lsm->cmd_type) {
3201 case LTTNG_LIST_SESSIONS:
3202 case LTTNG_LIST_TRACEPOINTS:
3203 case LTTNG_LIST_DOMAINS:
3204 case LTTNG_LIST_CHANNELS:
3205 case LTTNG_LIST_EVENTS:
3206 break;
3207 default:
3208 /* Setup lttng message with no payload */
3209 ret = setup_lttng_msg(cmd_ctx, 0);
3210 if (ret < 0) {
3211 /* This label does not try to unlock the session */
3212 goto init_setup_error;
3213 }
3214 }
3215
3216 /* Commands that DO NOT need a session. */
3217 switch (cmd_ctx->lsm->cmd_type) {
3218 case LTTNG_CREATE_SESSION:
3219 case LTTNG_CALIBRATE:
3220 case LTTNG_LIST_SESSIONS:
3221 case LTTNG_LIST_TRACEPOINTS:
3222 need_tracing_session = 0;
3223 break;
3224 default:
3225 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3226 session_lock_list();
3227 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3228 session_unlock_list();
3229 if (cmd_ctx->session == NULL) {
3230 if (cmd_ctx->lsm->session.name != NULL) {
3231 ret = LTTCOMM_SESS_NOT_FOUND;
3232 } else {
3233 /* If no session name specified */
3234 ret = LTTCOMM_SELECT_SESS;
3235 }
3236 goto error;
3237 } else {
3238 /* Acquire lock for the session */
3239 session_lock(cmd_ctx->session);
3240 }
3241 break;
3242 }
3243
3244 if (!need_domain) {
3245 goto skip_domain;
3246 }
3247 /*
3248 * Check domain type for specific "pre-action".
3249 */
3250 switch (cmd_ctx->lsm->domain.type) {
3251 case LTTNG_DOMAIN_KERNEL:
3252 if (!is_root) {
3253 ret = LTTCOMM_KERN_NA;
3254 goto error;
3255 }
3256
3257 /* Kernel tracer check */
3258 if (kernel_tracer_fd == -1) {
3259 /* Basically, load kernel tracer modules */
3260 ret = init_kernel_tracer();
3261 if (ret != 0) {
3262 goto error;
3263 }
3264 }
3265
3266 /* Need a session for kernel command */
3267 if (need_tracing_session) {
3268 if (cmd_ctx->session->kernel_session == NULL) {
3269 ret = create_kernel_session(cmd_ctx->session);
3270 if (ret < 0) {
3271 ret = LTTCOMM_KERN_SESS_FAIL;
3272 goto error;
3273 }
3274 }
3275
3276 /* Start the kernel consumer daemon */
3277 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3278 if (kconsumer_data.pid == 0 &&
3279 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3280 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3281 ret = start_consumerd(&kconsumer_data);
3282 if (ret < 0) {
3283 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3284 goto error;
3285 }
3286 } else {
3287 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3288 }
3289 }
3290 break;
3291 case LTTNG_DOMAIN_UST:
3292 {
3293 if (need_tracing_session) {
3294 if (cmd_ctx->session->ust_session == NULL) {
3295 ret = create_ust_session(cmd_ctx->session,
3296 &cmd_ctx->lsm->domain);
3297 if (ret != LTTCOMM_OK) {
3298 goto error;
3299 }
3300 }
3301 /* Start the UST consumer daemons */
3302 /* 64-bit */
3303 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3304 if (consumerd64_bin[0] != '\0' &&
3305 ustconsumer64_data.pid == 0 &&
3306 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3307 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3308 ret = start_consumerd(&ustconsumer64_data);
3309 if (ret < 0) {
3310 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3311 ust_consumerd64_fd = -EINVAL;
3312 goto error;
3313 }
3314
3315 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3316 } else {
3317 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3318 }
3319 /* 32-bit */
3320 if (consumerd32_bin[0] != '\0' &&
3321 ustconsumer32_data.pid == 0 &&
3322 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3323 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3324 ret = start_consumerd(&ustconsumer32_data);
3325 if (ret < 0) {
3326 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3327 ust_consumerd32_fd = -EINVAL;
3328 goto error;
3329 }
3330 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3331 } else {
3332 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3333 }
3334 }
3335 break;
3336 }
3337 default:
3338 break;
3339 }
3340 skip_domain:
3341
3342 /*
3343 * Check that the UID or GID match that of the tracing session.
3344 * The root user can interact with all sessions.
3345 */
3346 if (need_tracing_session) {
3347 if (!session_access_ok(cmd_ctx->session,
3348 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3349 ret = LTTCOMM_EPERM;
3350 goto error;
3351 }
3352 }
3353
3354 /* Process by command type */
3355 switch (cmd_ctx->lsm->cmd_type) {
3356 case LTTNG_ADD_CONTEXT:
3357 {
3358 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3359 cmd_ctx->lsm->u.context.channel_name,
3360 cmd_ctx->lsm->u.context.event_name,
3361 &cmd_ctx->lsm->u.context.ctx);
3362 break;
3363 }
3364 case LTTNG_DISABLE_CHANNEL:
3365 {
3366 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3367 cmd_ctx->lsm->u.disable.channel_name);
3368 break;
3369 }
3370 case LTTNG_DISABLE_EVENT:
3371 {
3372 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3373 cmd_ctx->lsm->u.disable.channel_name,
3374 cmd_ctx->lsm->u.disable.name);
3375 break;
3376 }
3377 case LTTNG_DISABLE_ALL_EVENT:
3378 {
3379 DBG("Disabling all events");
3380
3381 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3382 cmd_ctx->lsm->u.disable.channel_name);
3383 break;
3384 }
3385 case LTTNG_ENABLE_CHANNEL:
3386 {
3387 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3388 &cmd_ctx->lsm->u.channel.chan);
3389 break;
3390 }
3391 case LTTNG_ENABLE_EVENT:
3392 {
3393 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3394 cmd_ctx->lsm->u.enable.channel_name,
3395 &cmd_ctx->lsm->u.enable.event);
3396 break;
3397 }
3398 case LTTNG_ENABLE_ALL_EVENT:
3399 {
3400 DBG("Enabling all events");
3401
3402 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3403 cmd_ctx->lsm->u.enable.channel_name,
3404 cmd_ctx->lsm->u.enable.event.type);
3405 break;
3406 }
3407 case LTTNG_LIST_TRACEPOINTS:
3408 {
3409 struct lttng_event *events;
3410 ssize_t nb_events;
3411
3412 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3413 if (nb_events < 0) {
3414 ret = -nb_events;
3415 goto error;
3416 }
3417
3418 /*
3419 * Setup lttng message with payload size set to the event list size in
3420 * bytes and then copy list into the llm payload.
3421 */
3422 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3423 if (ret < 0) {
3424 free(events);
3425 goto setup_error;
3426 }
3427
3428 /* Copy event list into message payload */
3429 memcpy(cmd_ctx->llm->payload, events,
3430 sizeof(struct lttng_event) * nb_events);
3431
3432 free(events);
3433
3434 ret = LTTCOMM_OK;
3435 break;
3436 }
3437 case LTTNG_START_TRACE:
3438 {
3439 ret = cmd_start_trace(cmd_ctx->session);
3440 break;
3441 }
3442 case LTTNG_STOP_TRACE:
3443 {
3444 ret = cmd_stop_trace(cmd_ctx->session);
3445 break;
3446 }
3447 case LTTNG_CREATE_SESSION:
3448 {
3449 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3450 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3451 break;
3452 }
3453 case LTTNG_DESTROY_SESSION:
3454 {
3455 ret = cmd_destroy_session(cmd_ctx->session,
3456 cmd_ctx->lsm->session.name);
3457 break;
3458 }
3459 case LTTNG_LIST_DOMAINS:
3460 {
3461 ssize_t nb_dom;
3462 struct lttng_domain *domains;
3463
3464 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3465 if (nb_dom < 0) {
3466 ret = -nb_dom;
3467 goto error;
3468 }
3469
3470 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3471 if (ret < 0) {
3472 goto setup_error;
3473 }
3474
3475 /* Copy event list into message payload */
3476 memcpy(cmd_ctx->llm->payload, domains,
3477 nb_dom * sizeof(struct lttng_domain));
3478
3479 free(domains);
3480
3481 ret = LTTCOMM_OK;
3482 break;
3483 }
3484 case LTTNG_LIST_CHANNELS:
3485 {
3486 size_t nb_chan;
3487 struct lttng_channel *channels;
3488
3489 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3490 cmd_ctx->session, &channels);
3491 if (nb_chan < 0) {
3492 ret = -nb_chan;
3493 goto error;
3494 }
3495
3496 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3497 if (ret < 0) {
3498 goto setup_error;
3499 }
3500
3501 /* Copy event list into message payload */
3502 memcpy(cmd_ctx->llm->payload, channels,
3503 nb_chan * sizeof(struct lttng_channel));
3504
3505 free(channels);
3506
3507 ret = LTTCOMM_OK;
3508 break;
3509 }
3510 case LTTNG_LIST_EVENTS:
3511 {
3512 ssize_t nb_event;
3513 struct lttng_event *events = NULL;
3514
3515 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3516 cmd_ctx->lsm->u.list.channel_name, &events);
3517 if (nb_event < 0) {
3518 ret = -nb_event;
3519 goto error;
3520 }
3521
3522 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3523 if (ret < 0) {
3524 goto setup_error;
3525 }
3526
3527 /* Copy event list into message payload */
3528 memcpy(cmd_ctx->llm->payload, events,
3529 nb_event * sizeof(struct lttng_event));
3530
3531 free(events);
3532
3533 ret = LTTCOMM_OK;
3534 break;
3535 }
3536 case LTTNG_LIST_SESSIONS:
3537 {
3538 unsigned int nr_sessions;
3539
3540 session_lock_list();
3541 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3542
3543 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3544 if (ret < 0) {
3545 session_unlock_list();
3546 goto setup_error;
3547 }
3548
3549 /* Filled the session array */
3550 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3551 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3552
3553 session_unlock_list();
3554
3555 ret = LTTCOMM_OK;
3556 break;
3557 }
3558 case LTTNG_CALIBRATE:
3559 {
3560 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3561 &cmd_ctx->lsm->u.calibrate);
3562 break;
3563 }
3564 case LTTNG_REGISTER_CONSUMER:
3565 {
3566 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3567 cmd_ctx->lsm->u.reg.path);
3568 break;
3569 }
3570 default:
3571 ret = LTTCOMM_UND;
3572 break;
3573 }
3574
3575 error:
3576 if (cmd_ctx->llm == NULL) {
3577 DBG("Missing llm structure. Allocating one.");
3578 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3579 goto setup_error;
3580 }
3581 }
3582 /* Set return code */
3583 cmd_ctx->llm->ret_code = ret;
3584 setup_error:
3585 if (cmd_ctx->session) {
3586 session_unlock(cmd_ctx->session);
3587 }
3588 init_setup_error:
3589 return ret;
3590 }
3591
3592 /*
3593 * This thread manage all clients request using the unix client socket for
3594 * communication.
3595 */
3596 static void *thread_manage_clients(void *data)
3597 {
3598 int sock = -1, ret, i, pollfd;
3599 uint32_t revents, nb_fd;
3600 struct command_ctx *cmd_ctx = NULL;
3601 struct lttng_poll_event events;
3602
3603 DBG("[thread] Manage client started");
3604
3605 rcu_register_thread();
3606
3607 ret = lttcomm_listen_unix_sock(client_sock);
3608 if (ret < 0) {
3609 goto error;
3610 }
3611
3612 /*
3613 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3614 * more will be added to this poll set.
3615 */
3616 ret = create_thread_poll_set(&events, 2);
3617 if (ret < 0) {
3618 goto error;
3619 }
3620
3621 /* Add the application registration socket */
3622 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3623 if (ret < 0) {
3624 goto error;
3625 }
3626
3627 /*
3628 * Notify parent pid that we are ready to accept command for client side.
3629 */
3630 if (opt_sig_parent) {
3631 kill(ppid, SIGUSR1);
3632 }
3633
3634 while (1) {
3635 DBG("Accepting client command ...");
3636
3637 nb_fd = LTTNG_POLL_GETNB(&events);
3638
3639 /* Inifinite blocking call, waiting for transmission */
3640 restart:
3641 ret = lttng_poll_wait(&events, -1);
3642 if (ret < 0) {
3643 /*
3644 * Restart interrupted system call.
3645 */
3646 if (errno == EINTR) {
3647 goto restart;
3648 }
3649 goto error;
3650 }
3651
3652 for (i = 0; i < nb_fd; i++) {
3653 /* Fetch once the poll data */
3654 revents = LTTNG_POLL_GETEV(&events, i);
3655 pollfd = LTTNG_POLL_GETFD(&events, i);
3656
3657 /* Thread quit pipe has been closed. Killing thread. */
3658 ret = check_thread_quit_pipe(pollfd, revents);
3659 if (ret) {
3660 goto error;
3661 }
3662
3663 /* Event on the registration socket */
3664 if (pollfd == client_sock) {
3665 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3666 ERR("Client socket poll error");
3667 goto error;
3668 }
3669 }
3670 }
3671
3672 DBG("Wait for client response");
3673
3674 sock = lttcomm_accept_unix_sock(client_sock);
3675 if (sock < 0) {
3676 goto error;
3677 }
3678
3679 /* Set socket option for credentials retrieval */
3680 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3681 if (ret < 0) {
3682 goto error;
3683 }
3684
3685 /* Allocate context command to process the client request */
3686 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3687 if (cmd_ctx == NULL) {
3688 perror("zmalloc cmd_ctx");
3689 goto error;
3690 }
3691
3692 /* Allocate data buffer for reception */
3693 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3694 if (cmd_ctx->lsm == NULL) {
3695 perror("zmalloc cmd_ctx->lsm");
3696 goto error;
3697 }
3698
3699 cmd_ctx->llm = NULL;
3700 cmd_ctx->session = NULL;
3701
3702 /*
3703 * Data is received from the lttng client. The struct
3704 * lttcomm_session_msg (lsm) contains the command and data request of
3705 * the client.
3706 */
3707 DBG("Receiving data from client ...");
3708 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3709 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3710 if (ret <= 0) {
3711 DBG("Nothing recv() from client... continuing");
3712 close(sock);
3713 free(cmd_ctx);
3714 continue;
3715 }
3716
3717 // TODO: Validate cmd_ctx including sanity check for
3718 // security purpose.
3719
3720 rcu_thread_online();
3721 /*
3722 * This function dispatch the work to the kernel or userspace tracer
3723 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3724 * informations for the client. The command context struct contains
3725 * everything this function may needs.
3726 */
3727 ret = process_client_msg(cmd_ctx);
3728 rcu_thread_offline();
3729 if (ret < 0) {
3730 /*
3731 * TODO: Inform client somehow of the fatal error. At
3732 * this point, ret < 0 means that a zmalloc failed
3733 * (ENOMEM). Error detected but still accept command.
3734 */
3735 clean_command_ctx(&cmd_ctx);
3736 continue;
3737 }
3738
3739 DBG("Sending response (size: %d, retcode: %s)",
3740 cmd_ctx->lttng_msg_size,
3741 lttng_strerror(-cmd_ctx->llm->ret_code));
3742 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3743 if (ret < 0) {
3744 ERR("Failed to send data back to client");
3745 }
3746
3747 /* End of transmission */
3748 close(sock);
3749
3750 clean_command_ctx(&cmd_ctx);
3751 }
3752
3753 error:
3754 DBG("Client thread dying");
3755 unlink(client_unix_sock_path);
3756 if (sock >= 0) {
3757 close(client_sock);
3758 }
3759 if (sock >= 0) {
3760 close(sock);
3761 }
3762
3763 lttng_poll_clean(&events);
3764 clean_command_ctx(&cmd_ctx);
3765
3766 rcu_unregister_thread();
3767 return NULL;
3768 }
3769
3770
3771 /*
3772 * usage function on stderr
3773 */
3774 static void usage(void)
3775 {
3776 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3777 fprintf(stderr, " -h, --help Display this usage.\n");
3778 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3779 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3780 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3781 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3782 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3783 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3784 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3785 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3786 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3787 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3788 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3789 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3790 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3791 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3792 fprintf(stderr, " -V, --version Show version number.\n");
3793 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3794 fprintf(stderr, " -q, --quiet No output at all.\n");
3795 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3796 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3797 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3798 }
3799
3800 /*
3801 * daemon argument parsing
3802 */
3803 static int parse_args(int argc, char **argv)
3804 {
3805 int c;
3806
3807 static struct option long_options[] = {
3808 { "client-sock", 1, 0, 'c' },
3809 { "apps-sock", 1, 0, 'a' },
3810 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3811 { "kconsumerd-err-sock", 1, 0, 'E' },
3812 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3813 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3814 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3815 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3816 { "consumerd32-path", 1, 0, 'u' },
3817 { "consumerd32-libdir", 1, 0, 'U' },
3818 { "consumerd64-path", 1, 0, 't' },
3819 { "consumerd64-libdir", 1, 0, 'T' },
3820 { "daemonize", 0, 0, 'd' },
3821 { "sig-parent", 0, 0, 'S' },
3822 { "help", 0, 0, 'h' },
3823 { "group", 1, 0, 'g' },
3824 { "version", 0, 0, 'V' },
3825 { "quiet", 0, 0, 'q' },
3826 { "verbose", 0, 0, 'v' },
3827 { "verbose-consumer", 0, 0, 'Z' },
3828 { "no-kernel", 0, 0, 'N' },
3829 { NULL, 0, 0, 0 }
3830 };
3831
3832 while (1) {
3833 int option_index = 0;
3834 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3835 long_options, &option_index);
3836 if (c == -1) {
3837 break;
3838 }
3839
3840 switch (c) {
3841 case 0:
3842 fprintf(stderr, "option %s", long_options[option_index].name);
3843 if (optarg) {
3844 fprintf(stderr, " with arg %s\n", optarg);
3845 }
3846 break;
3847 case 'c':
3848 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3849 break;
3850 case 'a':
3851 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3852 break;
3853 case 'd':
3854 opt_daemon = 1;
3855 break;
3856 case 'g':
3857 opt_tracing_group = optarg;
3858 break;
3859 case 'h':
3860 usage();
3861 exit(EXIT_FAILURE);
3862 case 'V':
3863 fprintf(stdout, "%s\n", VERSION);
3864 exit(EXIT_SUCCESS);
3865 case 'S':
3866 opt_sig_parent = 1;
3867 break;
3868 case 'E':
3869 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3870 break;
3871 case 'C':
3872 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3873 break;
3874 case 'F':
3875 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3876 break;
3877 case 'D':
3878 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3879 break;
3880 case 'H':
3881 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3882 break;
3883 case 'G':
3884 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3885 break;
3886 case 'N':
3887 opt_no_kernel = 1;
3888 break;
3889 case 'q':
3890 opt_quiet = 1;
3891 break;
3892 case 'v':
3893 /* Verbose level can increase using multiple -v */
3894 opt_verbose += 1;
3895 break;
3896 case 'Z':
3897 opt_verbose_consumer += 1;
3898 break;
3899 case 'u':
3900 consumerd32_bin= optarg;
3901 break;
3902 case 'U':
3903 consumerd32_libdir = optarg;
3904 break;
3905 case 't':
3906 consumerd64_bin = optarg;
3907 break;
3908 case 'T':
3909 consumerd64_libdir = optarg;
3910 break;
3911 default:
3912 /* Unknown option or other error.
3913 * Error is printed by getopt, just return */
3914 return -1;
3915 }
3916 }
3917
3918 return 0;
3919 }
3920
3921 /*
3922 * Creates the two needed socket by the daemon.
3923 * apps_sock - The communication socket for all UST apps.
3924 * client_sock - The communication of the cli tool (lttng).
3925 */
3926 static int init_daemon_socket(void)
3927 {
3928 int ret = 0;
3929 mode_t old_umask;
3930
3931 old_umask = umask(0);
3932
3933 /* Create client tool unix socket */
3934 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3935 if (client_sock < 0) {
3936 ERR("Create unix sock failed: %s", client_unix_sock_path);
3937 ret = -1;
3938 goto end;
3939 }
3940
3941 /* File permission MUST be 660 */
3942 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3943 if (ret < 0) {
3944 ERR("Set file permissions failed: %s", client_unix_sock_path);
3945 perror("chmod");
3946 goto end;
3947 }
3948
3949 /* Create the application unix socket */
3950 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3951 if (apps_sock < 0) {
3952 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3953 ret = -1;
3954 goto end;
3955 }
3956
3957 /* File permission MUST be 666 */
3958 ret = chmod(apps_unix_sock_path,
3959 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3960 if (ret < 0) {
3961 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3962 perror("chmod");
3963 goto end;
3964 }
3965
3966 end:
3967 umask(old_umask);
3968 return ret;
3969 }
3970
3971 /*
3972 * Check if the global socket is available, and if a daemon is answering at the
3973 * other side. If yes, error is returned.
3974 */
3975 static int check_existing_daemon(void)
3976 {
3977 /* Is there anybody out there ? */
3978 if (lttng_session_daemon_alive()) {
3979 return -EEXIST;
3980 }
3981
3982 return 0;
3983 }
3984
3985 /*
3986 * Set the tracing group gid onto the client socket.
3987 *
3988 * Race window between mkdir and chown is OK because we are going from more
3989 * permissive (root.root) to less permissive (root.tracing).
3990 */
3991 static int set_permissions(char *rundir)
3992 {
3993 int ret;
3994 gid_t gid;
3995
3996 gid = allowed_group();
3997 if (gid < 0) {
3998 WARN("No tracing group detected");
3999 ret = 0;
4000 goto end;
4001 }
4002
4003 /* Set lttng run dir */
4004 ret = chown(rundir, 0, gid);
4005 if (ret < 0) {
4006 ERR("Unable to set group on %s", rundir);
4007 perror("chown");
4008 }
4009
4010 /* Ensure tracing group can search the run dir */
4011 ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
4012 if (ret < 0) {
4013 ERR("Unable to set permissions on %s", rundir);
4014 perror("chmod");
4015 }
4016
4017 /* lttng client socket path */
4018 ret = chown(client_unix_sock_path, 0, gid);
4019 if (ret < 0) {
4020 ERR("Unable to set group on %s", client_unix_sock_path);
4021 perror("chown");
4022 }
4023
4024 /* kconsumer error socket path */
4025 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4026 if (ret < 0) {
4027 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4028 perror("chown");
4029 }
4030
4031 /* 64-bit ustconsumer error socket path */
4032 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4033 if (ret < 0) {
4034 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4035 perror("chown");
4036 }
4037
4038 /* 32-bit ustconsumer compat32 error socket path */
4039 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4040 if (ret < 0) {
4041 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4042 perror("chown");
4043 }
4044
4045 DBG("All permissions are set");
4046
4047 end:
4048 return ret;
4049 }
4050
4051 /*
4052 * Create the pipe used to wake up the kernel thread.
4053 */
4054 static int create_kernel_poll_pipe(void)
4055 {
4056 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4057 }
4058
4059 /*
4060 * Create the application command pipe to wake thread_manage_apps.
4061 */
4062 static int create_apps_cmd_pipe(void)
4063 {
4064 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4065 }
4066
4067 /*
4068 * Create the lttng run directory needed for all global sockets and pipe.
4069 */
4070 static int create_lttng_rundir(const char *rundir)
4071 {
4072 int ret;
4073
4074 DBG3("Creating LTTng run directory: %s", rundir);
4075
4076 ret = mkdir(rundir, S_IRWXU);
4077 if (ret < 0) {
4078 if (errno != EEXIST) {
4079 ERR("Unable to create %s", rundir);
4080 goto error;
4081 } else {
4082 ret = 0;
4083 }
4084 }
4085
4086 error:
4087 return ret;
4088 }
4089
4090 /*
4091 * Setup sockets and directory needed by the kconsumerd communication with the
4092 * session daemon.
4093 */
4094 static int set_consumer_sockets(struct consumer_data *consumer_data,
4095 const char *rundir)
4096 {
4097 int ret;
4098 char path[PATH_MAX];
4099
4100 switch (consumer_data->type) {
4101 case LTTNG_CONSUMER_KERNEL:
4102 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4103 break;
4104 case LTTNG_CONSUMER64_UST:
4105 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4106 break;
4107 case LTTNG_CONSUMER32_UST:
4108 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4109 break;
4110 default:
4111 ERR("Consumer type unknown");
4112 ret = -EINVAL;
4113 goto error;
4114 }
4115
4116 DBG2("Creating consumer directory: %s", path);
4117
4118 ret = mkdir(path, S_IRWXU);
4119 if (ret < 0) {
4120 if (errno != EEXIST) {
4121 ERR("Failed to create %s", path);
4122 goto error;
4123 }
4124 ret = 0;
4125 }
4126
4127 /* Create the kconsumerd error unix socket */
4128 consumer_data->err_sock =
4129 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4130 if (consumer_data->err_sock < 0) {
4131 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4132 ret = -1;
4133 goto error;
4134 }
4135
4136 /* File permission MUST be 660 */
4137 ret = chmod(consumer_data->err_unix_sock_path,
4138 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4139 if (ret < 0) {
4140 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4141 PERROR("chmod");
4142 goto error;
4143 }
4144
4145 error:
4146 return ret;
4147 }
4148
4149 /*
4150 * Signal handler for the daemon
4151 *
4152 * Simply stop all worker threads, leaving main() return gracefully after
4153 * joining all threads and calling cleanup().
4154 */
4155 static void sighandler(int sig)
4156 {
4157 switch (sig) {
4158 case SIGPIPE:
4159 DBG("SIGPIPE caught");
4160 return;
4161 case SIGINT:
4162 DBG("SIGINT caught");
4163 stop_threads();
4164 break;
4165 case SIGTERM:
4166 DBG("SIGTERM caught");
4167 stop_threads();
4168 break;
4169 default:
4170 break;
4171 }
4172 }
4173
4174 /*
4175 * Setup signal handler for :
4176 * SIGINT, SIGTERM, SIGPIPE
4177 */
4178 static int set_signal_handler(void)
4179 {
4180 int ret = 0;
4181 struct sigaction sa;
4182 sigset_t sigset;
4183
4184 if ((ret = sigemptyset(&sigset)) < 0) {
4185 perror("sigemptyset");
4186 return ret;
4187 }
4188
4189 sa.sa_handler = sighandler;
4190 sa.sa_mask = sigset;
4191 sa.sa_flags = 0;
4192 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4193 perror("sigaction");
4194 return ret;
4195 }
4196
4197 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4198 perror("sigaction");
4199 return ret;
4200 }
4201
4202 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4203 perror("sigaction");
4204 return ret;
4205 }
4206
4207 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4208
4209 return ret;
4210 }
4211
4212 /*
4213 * Set open files limit to unlimited. This daemon can open a large number of
4214 * file descriptors in order to consumer multiple kernel traces.
4215 */
4216 static void set_ulimit(void)
4217 {
4218 int ret;
4219 struct rlimit lim;
4220
4221 /* The kernel does not allowed an infinite limit for open files */
4222 lim.rlim_cur = 65535;
4223 lim.rlim_max = 65535;
4224
4225 ret = setrlimit(RLIMIT_NOFILE, &lim);
4226 if (ret < 0) {
4227 perror("failed to set open files limit");
4228 }
4229 }
4230
4231 /*
4232 * main
4233 */
4234 int main(int argc, char **argv)
4235 {
4236 int ret = 0;
4237 void *status;
4238 const char *home_path;
4239
4240 init_kernel_workarounds();
4241
4242 rcu_register_thread();
4243
4244 /* Create thread quit pipe */
4245 if ((ret = init_thread_quit_pipe()) < 0) {
4246 goto error;
4247 }
4248
4249 setup_consumerd_path();
4250
4251 /* Parse arguments */
4252 progname = argv[0];
4253 if ((ret = parse_args(argc, argv) < 0)) {
4254 goto error;
4255 }
4256
4257 /* Daemonize */
4258 if (opt_daemon) {
4259 ret = daemon(0, 0);
4260 if (ret < 0) {
4261 perror("daemon");
4262 goto error;
4263 }
4264 }
4265
4266 /* Check if daemon is UID = 0 */
4267 is_root = !getuid();
4268
4269 if (is_root) {
4270 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4271
4272 /* Create global run dir with root access */
4273 ret = create_lttng_rundir(rundir);
4274 if (ret < 0) {
4275 goto error;
4276 }
4277
4278 if (strlen(apps_unix_sock_path) == 0) {
4279 snprintf(apps_unix_sock_path, PATH_MAX,
4280 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4281 }
4282
4283 if (strlen(client_unix_sock_path) == 0) {
4284 snprintf(client_unix_sock_path, PATH_MAX,
4285 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4286 }
4287
4288 /* Set global SHM for ust */
4289 if (strlen(wait_shm_path) == 0) {
4290 snprintf(wait_shm_path, PATH_MAX,
4291 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4292 }
4293
4294 /* Setup kernel consumerd path */
4295 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4296 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4297 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4298 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4299
4300 DBG2("Kernel consumer err path: %s",
4301 kconsumer_data.err_unix_sock_path);
4302 DBG2("Kernel consumer cmd path: %s",
4303 kconsumer_data.cmd_unix_sock_path);
4304 } else {
4305 home_path = get_home_dir();
4306 if (home_path == NULL) {
4307 /* TODO: Add --socket PATH option */
4308 ERR("Can't get HOME directory for sockets creation.");
4309 ret = -EPERM;
4310 goto error;
4311 }
4312
4313 /*
4314 * Create rundir from home path. This will create something like
4315 * $HOME/.lttng
4316 */
4317 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4318 if (ret < 0) {
4319 ret = -ENOMEM;
4320 goto error;
4321 }
4322
4323 ret = create_lttng_rundir(rundir);
4324 if (ret < 0) {
4325 goto error;
4326 }
4327
4328 if (strlen(apps_unix_sock_path) == 0) {
4329 snprintf(apps_unix_sock_path, PATH_MAX,
4330 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4331 }
4332
4333 /* Set the cli tool unix socket path */
4334 if (strlen(client_unix_sock_path) == 0) {
4335 snprintf(client_unix_sock_path, PATH_MAX,
4336 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4337 }
4338
4339 /* Set global SHM for ust */
4340 if (strlen(wait_shm_path) == 0) {
4341 snprintf(wait_shm_path, PATH_MAX,
4342 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4343 }
4344 }
4345
4346 DBG("Client socket path %s", client_unix_sock_path);
4347 DBG("Application socket path %s", apps_unix_sock_path);
4348 DBG("LTTng run directory path: %s", rundir);
4349
4350 /* 32 bits consumerd path setup */
4351 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4352 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4353 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4354 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4355
4356 DBG2("UST consumer 32 bits err path: %s",
4357 ustconsumer32_data.err_unix_sock_path);
4358 DBG2("UST consumer 32 bits cmd path: %s",
4359 ustconsumer32_data.cmd_unix_sock_path);
4360
4361 /* 64 bits consumerd path setup */
4362 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4363 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4364 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4365 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4366
4367 DBG2("UST consumer 64 bits err path: %s",
4368 ustconsumer64_data.err_unix_sock_path);
4369 DBG2("UST consumer 64 bits cmd path: %s",
4370 ustconsumer64_data.cmd_unix_sock_path);
4371
4372 /*
4373 * See if daemon already exist.
4374 */
4375 if ((ret = check_existing_daemon()) < 0) {
4376 ERR("Already running daemon.\n");
4377 /*
4378 * We do not goto exit because we must not cleanup()
4379 * because a daemon is already running.
4380 */
4381 goto error;
4382 }
4383
4384 /* After this point, we can safely call cleanup() with "goto exit" */
4385
4386 /*
4387 * These actions must be executed as root. We do that *after* setting up
4388 * the sockets path because we MUST make the check for another daemon using
4389 * those paths *before* trying to set the kernel consumer sockets and init
4390 * kernel tracer.
4391 */
4392 if (is_root) {
4393 ret = set_consumer_sockets(&kconsumer_data, rundir);
4394 if (ret < 0) {
4395 goto exit;
4396 }
4397
4398 /* Setup kernel tracer */
4399 if (!opt_no_kernel) {
4400 init_kernel_tracer();
4401 }
4402
4403 /* Set ulimit for open files */
4404 set_ulimit();
4405 }
4406
4407 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4408 if (ret < 0) {
4409 goto exit;
4410 }
4411
4412 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4413 if (ret < 0) {
4414 goto exit;
4415 }
4416
4417 if ((ret = set_signal_handler()) < 0) {
4418 goto exit;
4419 }
4420
4421 /* Setup the needed unix socket */
4422 if ((ret = init_daemon_socket()) < 0) {
4423 goto exit;
4424 }
4425
4426 /* Set credentials to socket */
4427 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4428 goto exit;
4429 }
4430
4431 /* Get parent pid if -S, --sig-parent is specified. */
4432 if (opt_sig_parent) {
4433 ppid = getppid();
4434 }
4435
4436 /* Setup the kernel pipe for waking up the kernel thread */
4437 if ((ret = create_kernel_poll_pipe()) < 0) {
4438 goto exit;
4439 }
4440
4441 /* Setup the thread apps communication pipe. */
4442 if ((ret = create_apps_cmd_pipe()) < 0) {
4443 goto exit;
4444 }
4445
4446 /* Init UST command queue. */
4447 cds_wfq_init(&ust_cmd_queue.queue);
4448
4449 /* Init UST app hash table */
4450 ust_app_ht_alloc();
4451
4452 /*
4453 * Get session list pointer. This pointer MUST NOT be free(). This list is
4454 * statically declared in session.c
4455 */
4456 session_list_ptr = session_get_list();
4457
4458 /* Set up max poll set size */
4459 lttng_poll_set_max_size();
4460
4461 /* Create thread to manage the client socket */
4462 ret = pthread_create(&client_thread, NULL,
4463 thread_manage_clients, (void *) NULL);
4464 if (ret != 0) {
4465 perror("pthread_create clients");
4466 goto exit_client;
4467 }
4468
4469 /* Create thread to dispatch registration */
4470 ret = pthread_create(&dispatch_thread, NULL,
4471 thread_dispatch_ust_registration, (void *) NULL);
4472 if (ret != 0) {
4473 perror("pthread_create dispatch");
4474 goto exit_dispatch;
4475 }
4476
4477 /* Create thread to manage application registration. */
4478 ret = pthread_create(&reg_apps_thread, NULL,
4479 thread_registration_apps, (void *) NULL);
4480 if (ret != 0) {
4481 perror("pthread_create registration");
4482 goto exit_reg_apps;
4483 }
4484
4485 /* Create thread to manage application socket */
4486 ret = pthread_create(&apps_thread, NULL,
4487 thread_manage_apps, (void *) NULL);
4488 if (ret != 0) {
4489 perror("pthread_create apps");
4490 goto exit_apps;
4491 }
4492
4493 /* Create kernel thread to manage kernel event */
4494 ret = pthread_create(&kernel_thread, NULL,
4495 thread_manage_kernel, (void *) NULL);
4496 if (ret != 0) {
4497 perror("pthread_create kernel");
4498 goto exit_kernel;
4499 }
4500
4501 ret = pthread_join(kernel_thread, &status);
4502 if (ret != 0) {
4503 perror("pthread_join");
4504 goto error; /* join error, exit without cleanup */
4505 }
4506
4507 exit_kernel:
4508 ret = pthread_join(apps_thread, &status);
4509 if (ret != 0) {
4510 perror("pthread_join");
4511 goto error; /* join error, exit without cleanup */
4512 }
4513
4514 exit_apps:
4515 ret = pthread_join(reg_apps_thread, &status);
4516 if (ret != 0) {
4517 perror("pthread_join");
4518 goto error; /* join error, exit without cleanup */
4519 }
4520
4521 exit_reg_apps:
4522 ret = pthread_join(dispatch_thread, &status);
4523 if (ret != 0) {
4524 perror("pthread_join");
4525 goto error; /* join error, exit without cleanup */
4526 }
4527
4528 exit_dispatch:
4529 ret = pthread_join(client_thread, &status);
4530 if (ret != 0) {
4531 perror("pthread_join");
4532 goto error; /* join error, exit without cleanup */
4533 }
4534
4535 ret = join_consumer_thread(&kconsumer_data);
4536 if (ret != 0) {
4537 perror("join_consumer");
4538 goto error; /* join error, exit without cleanup */
4539 }
4540
4541 exit_client:
4542 exit:
4543 /*
4544 * cleanup() is called when no other thread is running.
4545 */
4546 rcu_thread_online();
4547 cleanup();
4548 rcu_thread_offline();
4549 rcu_unregister_thread();
4550 if (!ret) {
4551 exit(EXIT_SUCCESS);
4552 }
4553 error:
4554 exit(EXIT_FAILURE);
4555 }
LTTng 2.0 tools and control repository
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