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Add debug output to sessiond's kernel consumer selection
[lttng-tools.git] / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <lttng-consumerd.h>
42 #include <lttng-ht.h>
43 #include <lttng-sessiond-comm.h>
44 #include <lttng/lttng-consumer.h>
45
46 #include <lttngerr.h>
47 #include <runas.h>
48
49 #include "channel.h"
50 #include "compat/poll.h"
51 #include "context.h"
52 #include "event.h"
53 #include "futex.h"
54 #include "kernel.h"
55 #include "lttng-sessiond.h"
56 #include "shm.h"
57 #include "ust-app.h"
58 #include "ust-ctl.h"
59 #include "utils.h"
60
61 #define CONSUMERD_FILE "lttng-consumerd"
62
63 struct consumer_data {
64 enum lttng_consumer_type type;
65
66 pthread_t thread; /* Worker thread interacting with the consumer */
67 sem_t sem;
68
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex;
71 pid_t pid;
72
73 int err_sock;
74 int cmd_sock;
75
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path[PATH_MAX];
78 char cmd_unix_sock_path[PATH_MAX];
79 };
80
81 /* Const values */
82 const char default_home_dir[] = DEFAULT_HOME_DIR;
83 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
84 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
85 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
86
87 /* Variables */
88 int opt_verbose; /* Not static for lttngerr.h */
89 int opt_verbose_consumer; /* Not static for lttngerr.h */
90 int opt_quiet; /* Not static for lttngerr.h */
91
92 const char *progname;
93 const char *opt_tracing_group;
94 static int opt_sig_parent;
95 static int opt_daemon;
96 static int opt_no_kernel;
97 static int is_root; /* Set to 1 if the daemon is running as root */
98 static pid_t ppid; /* Parent PID for --sig-parent option */
99 static char *rundir;
100
101 /* Consumer daemon specific control data */
102 static struct consumer_data kconsumer_data = {
103 .type = LTTNG_CONSUMER_KERNEL,
104 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
105 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
106 };
107 static struct consumer_data ustconsumer64_data = {
108 .type = LTTNG_CONSUMER64_UST,
109 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
110 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
111 };
112 static struct consumer_data ustconsumer32_data = {
113 .type = LTTNG_CONSUMER32_UST,
114 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
115 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
116 };
117
118 static int dispatch_thread_exit;
119
120 /* Global application Unix socket path */
121 static char apps_unix_sock_path[PATH_MAX];
122 /* Global client Unix socket path */
123 static char client_unix_sock_path[PATH_MAX];
124 /* global wait shm path for UST */
125 static char wait_shm_path[PATH_MAX];
126
127 /* Sockets and FDs */
128 static int client_sock;
129 static int apps_sock;
130 static int kernel_tracer_fd;
131 static int kernel_poll_pipe[2];
132
133 /*
134 * Quit pipe for all threads. This permits a single cancellation point
135 * for all threads when receiving an event on the pipe.
136 */
137 static int thread_quit_pipe[2];
138
139 /*
140 * This pipe is used to inform the thread managing application communication
141 * that a command is queued and ready to be processed.
142 */
143 static int apps_cmd_pipe[2];
144
145 /* Pthread, Mutexes and Semaphores */
146 static pthread_t apps_thread;
147 static pthread_t reg_apps_thread;
148 static pthread_t client_thread;
149 static pthread_t kernel_thread;
150 static pthread_t dispatch_thread;
151
152
153 /*
154 * UST registration command queue. This queue is tied with a futex and uses a N
155 * wakers / 1 waiter implemented and detailed in futex.c/.h
156 *
157 * The thread_manage_apps and thread_dispatch_ust_registration interact with
158 * this queue and the wait/wake scheme.
159 */
160 static struct ust_cmd_queue ust_cmd_queue;
161
162 /*
163 * Pointer initialized before thread creation.
164 *
165 * This points to the tracing session list containing the session count and a
166 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
167 * MUST NOT be taken if you call a public function in session.c.
168 *
169 * The lock is nested inside the structure: session_list_ptr->lock. Please use
170 * session_lock_list and session_unlock_list for lock acquisition.
171 */
172 static struct ltt_session_list *session_list_ptr;
173
174 int ust_consumerd64_fd = -1;
175 int ust_consumerd32_fd = -1;
176
177 static const char *consumerd32_bin =
178 __stringify(CONFIG_CONSUMERD32_BIN);
179 static const char *consumerd64_bin =
180 __stringify(CONFIG_CONSUMERD64_BIN);
181 static const char *consumerd32_libdir =
182 __stringify(CONFIG_CONSUMERD32_LIBDIR);
183 static const char *consumerd64_libdir =
184 __stringify(CONFIG_CONSUMERD64_LIBDIR);
185
186 static
187 void setup_consumerd_path(void)
188 {
189 const char *bin, *libdir;
190
191 /*
192 * Allow INSTALL_BIN_PATH to be used as a target path for the
193 * native architecture size consumer if CONFIG_CONSUMER*_PATH
194 * has not been defined.
195 */
196 #if (CAA_BITS_PER_LONG == 32)
197 if (!consumerd32_bin[0]) {
198 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
199 }
200 if (!consumerd32_libdir[0]) {
201 consumerd32_libdir = INSTALL_LIB_PATH;
202 }
203 #elif (CAA_BITS_PER_LONG == 64)
204 if (!consumerd64_bin[0]) {
205 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
206 }
207 if (!consumerd64_libdir[0]) {
208 consumerd64_libdir = INSTALL_LIB_PATH;
209 }
210 #else
211 #error "Unknown bitness"
212 #endif
213
214 /*
215 * runtime env. var. overrides the build default.
216 */
217 bin = getenv("LTTNG_CONSUMERD32_BIN");
218 if (bin) {
219 consumerd32_bin = bin;
220 }
221 bin = getenv("LTTNG_CONSUMERD64_BIN");
222 if (bin) {
223 consumerd64_bin = bin;
224 }
225 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
226 if (libdir) {
227 consumerd32_libdir = libdir;
228 }
229 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
230 if (libdir) {
231 consumerd64_libdir = libdir;
232 }
233 }
234
235 /*
236 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
237 */
238 static int create_thread_poll_set(struct lttng_poll_event *events,
239 unsigned int size)
240 {
241 int ret;
242
243 if (events == NULL || size == 0) {
244 ret = -1;
245 goto error;
246 }
247
248 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
249 if (ret < 0) {
250 goto error;
251 }
252
253 /* Add quit pipe */
254 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
255 if (ret < 0) {
256 goto error;
257 }
258
259 return 0;
260
261 error:
262 return ret;
263 }
264
265 /*
266 * Check if the thread quit pipe was triggered.
267 *
268 * Return 1 if it was triggered else 0;
269 */
270 static int check_thread_quit_pipe(int fd, uint32_t events)
271 {
272 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
273 return 1;
274 }
275
276 return 0;
277 }
278
279 /*
280 * Remove modules in reverse load order.
281 */
282 static int modprobe_remove_kernel_modules(void)
283 {
284 int ret = 0, i;
285 char modprobe[256];
286
287 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
288 ret = snprintf(modprobe, sizeof(modprobe),
289 "/sbin/modprobe -r -q %s",
290 kernel_modules_list[i].name);
291 if (ret < 0) {
292 perror("snprintf modprobe -r");
293 goto error;
294 }
295 modprobe[sizeof(modprobe) - 1] = '\0';
296 ret = system(modprobe);
297 if (ret == -1) {
298 ERR("Unable to launch modprobe -r for module %s",
299 kernel_modules_list[i].name);
300 } else if (kernel_modules_list[i].required
301 && WEXITSTATUS(ret) != 0) {
302 ERR("Unable to remove module %s",
303 kernel_modules_list[i].name);
304 } else {
305 DBG("Modprobe removal successful %s",
306 kernel_modules_list[i].name);
307 }
308 }
309
310 error:
311 return ret;
312 }
313
314 /*
315 * Return group ID of the tracing group or -1 if not found.
316 */
317 static gid_t allowed_group(void)
318 {
319 struct group *grp;
320
321 if (opt_tracing_group) {
322 grp = getgrnam(opt_tracing_group);
323 } else {
324 grp = getgrnam(default_tracing_group);
325 }
326 if (!grp) {
327 return -1;
328 } else {
329 return grp->gr_gid;
330 }
331 }
332
333 /*
334 * Init thread quit pipe.
335 *
336 * Return -1 on error or 0 if all pipes are created.
337 */
338 static int init_thread_quit_pipe(void)
339 {
340 int ret;
341
342 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
343 if (ret < 0) {
344 perror("thread quit pipe");
345 goto error;
346 }
347
348 error:
349 return ret;
350 }
351
352 /*
353 * Complete teardown of a kernel session. This free all data structure related
354 * to a kernel session and update counter.
355 */
356 static void teardown_kernel_session(struct ltt_session *session)
357 {
358 if (!session->kernel_session) {
359 DBG3("No kernel session when tearingdown session");
360 return;
361 }
362
363 DBG("Tearing down kernel session");
364
365 /*
366 * If a custom kernel consumer was registered, close the socket before
367 * tearing down the complete kernel session structure
368 */
369 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
370 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
371 }
372
373 trace_kernel_destroy_session(session->kernel_session);
374 }
375
376 /*
377 * Complete teardown of all UST sessions. This will free everything on his path
378 * and destroy the core essence of all ust sessions :)
379 */
380 static void teardown_ust_session(struct ltt_session *session)
381 {
382 int ret;
383
384 if (!session->ust_session) {
385 DBG3("No UST session when tearingdown session");
386 return;
387 }
388
389 DBG("Tearing down UST session(s)");
390
391 ret = ust_app_destroy_trace_all(session->ust_session);
392 if (ret) {
393 ERR("Error in ust_app_destroy_trace_all");
394 }
395
396 trace_ust_destroy_session(session->ust_session);
397 }
398
399 /*
400 * Stop all threads by closing the thread quit pipe.
401 */
402 static void stop_threads(void)
403 {
404 int ret;
405
406 /* Stopping all threads */
407 DBG("Terminating all threads");
408 ret = notify_thread_pipe(thread_quit_pipe[1]);
409 if (ret < 0) {
410 ERR("write error on thread quit pipe");
411 }
412
413 /* Dispatch thread */
414 dispatch_thread_exit = 1;
415 futex_nto1_wake(&ust_cmd_queue.futex);
416 }
417
418 /*
419 * Cleanup the daemon
420 */
421 static void cleanup(void)
422 {
423 int ret;
424 char *cmd;
425 struct ltt_session *sess, *stmp;
426
427 DBG("Cleaning up");
428
429 DBG("Removing %s directory", rundir);
430 ret = asprintf(&cmd, "rm -rf %s", rundir);
431 if (ret < 0) {
432 ERR("asprintf failed. Something is really wrong!");
433 }
434
435 /* Remove lttng run directory */
436 ret = system(cmd);
437 if (ret < 0) {
438 ERR("Unable to clean %s", rundir);
439 }
440 free(cmd);
441
442 DBG("Cleaning up all session");
443
444 /* Destroy session list mutex */
445 if (session_list_ptr != NULL) {
446 pthread_mutex_destroy(&session_list_ptr->lock);
447
448 /* Cleanup ALL session */
449 cds_list_for_each_entry_safe(sess, stmp,
450 &session_list_ptr->head, list) {
451 teardown_kernel_session(sess);
452 teardown_ust_session(sess);
453 free(sess);
454 }
455 }
456
457 DBG("Closing all UST sockets");
458 ust_app_clean_list();
459
460 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
461
462 if (is_root && !opt_no_kernel) {
463 DBG2("Closing kernel fd");
464 close(kernel_tracer_fd);
465 DBG("Unloading kernel modules");
466 modprobe_remove_kernel_modules();
467 }
468
469 close(thread_quit_pipe[0]);
470 close(thread_quit_pipe[1]);
471
472 /* <fun> */
473 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
474 "Matthew, BEET driven development works!%c[%dm",
475 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
476 /* </fun> */
477 }
478
479 /*
480 * Send data on a unix socket using the liblttsessiondcomm API.
481 *
482 * Return lttcomm error code.
483 */
484 static int send_unix_sock(int sock, void *buf, size_t len)
485 {
486 /* Check valid length */
487 if (len <= 0) {
488 return -1;
489 }
490
491 return lttcomm_send_unix_sock(sock, buf, len);
492 }
493
494 /*
495 * Free memory of a command context structure.
496 */
497 static void clean_command_ctx(struct command_ctx **cmd_ctx)
498 {
499 DBG("Clean command context structure");
500 if (*cmd_ctx) {
501 if ((*cmd_ctx)->llm) {
502 free((*cmd_ctx)->llm);
503 }
504 if ((*cmd_ctx)->lsm) {
505 free((*cmd_ctx)->lsm);
506 }
507 free(*cmd_ctx);
508 *cmd_ctx = NULL;
509 }
510 }
511
512 /*
513 * Send all stream fds of kernel channel to the consumer.
514 */
515 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
516 int sock, struct ltt_kernel_channel *channel,
517 uid_t uid, gid_t gid)
518 {
519 int ret;
520 struct ltt_kernel_stream *stream;
521 struct lttcomm_consumer_msg lkm;
522
523 DBG("Sending streams of channel %s to kernel consumer",
524 channel->channel->name);
525
526 /* Send channel */
527 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
528 lkm.u.channel.channel_key = channel->fd;
529 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
530 lkm.u.channel.mmap_len = 0; /* for kernel */
531 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
532 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
533 if (ret < 0) {
534 perror("send consumer channel");
535 goto error;
536 }
537
538 /* Send streams */
539 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
540 if (!stream->fd) {
541 continue;
542 }
543 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
544 lkm.u.stream.channel_key = channel->fd;
545 lkm.u.stream.stream_key = stream->fd;
546 lkm.u.stream.state = stream->state;
547 lkm.u.stream.output = channel->channel->attr.output;
548 lkm.u.stream.mmap_len = 0; /* for kernel */
549 lkm.u.stream.uid = uid;
550 lkm.u.stream.gid = gid;
551 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
552 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
553 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
554 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
555 if (ret < 0) {
556 perror("send consumer stream");
557 goto error;
558 }
559 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
560 if (ret < 0) {
561 perror("send consumer stream ancillary data");
562 goto error;
563 }
564 }
565
566 DBG("consumer channel streams sent");
567
568 return 0;
569
570 error:
571 return ret;
572 }
573
574 /*
575 * Send all stream fds of the kernel session to the consumer.
576 */
577 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
578 struct ltt_kernel_session *session)
579 {
580 int ret;
581 struct ltt_kernel_channel *chan;
582 struct lttcomm_consumer_msg lkm;
583 int sock = session->consumer_fd;
584
585 DBG("Sending metadata stream fd");
586
587 /* Extra protection. It's NOT supposed to be set to 0 at this point */
588 if (session->consumer_fd == 0) {
589 session->consumer_fd = consumer_data->cmd_sock;
590 }
591
592 if (session->metadata_stream_fd != 0) {
593 /* Send metadata channel fd */
594 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
595 lkm.u.channel.channel_key = session->metadata->fd;
596 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
597 lkm.u.channel.mmap_len = 0; /* for kernel */
598 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
599 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
600 if (ret < 0) {
601 perror("send consumer channel");
602 goto error;
603 }
604
605 /* Send metadata stream fd */
606 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
607 lkm.u.stream.channel_key = session->metadata->fd;
608 lkm.u.stream.stream_key = session->metadata_stream_fd;
609 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
610 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
611 lkm.u.stream.mmap_len = 0; /* for kernel */
612 lkm.u.stream.uid = session->uid;
613 lkm.u.stream.gid = session->gid;
614 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
615 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
616 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
617 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
618 if (ret < 0) {
619 perror("send consumer stream");
620 goto error;
621 }
622 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
623 if (ret < 0) {
624 perror("send consumer stream");
625 goto error;
626 }
627 }
628
629 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
630 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
631 session->uid, session->gid);
632 if (ret < 0) {
633 goto error;
634 }
635 }
636
637 DBG("consumer fds (metadata and channel streams) sent");
638
639 return 0;
640
641 error:
642 return ret;
643 }
644
645 /*
646 * Notify UST applications using the shm mmap futex.
647 */
648 static int notify_ust_apps(int active)
649 {
650 char *wait_shm_mmap;
651
652 DBG("Notifying applications of session daemon state: %d", active);
653
654 /* See shm.c for this call implying mmap, shm and futex calls */
655 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
656 if (wait_shm_mmap == NULL) {
657 goto error;
658 }
659
660 /* Wake waiting process */
661 futex_wait_update((int32_t *) wait_shm_mmap, active);
662
663 /* Apps notified successfully */
664 return 0;
665
666 error:
667 return -1;
668 }
669
670 /*
671 * Setup the outgoing data buffer for the response (llm) by allocating the
672 * right amount of memory and copying the original information from the lsm
673 * structure.
674 *
675 * Return total size of the buffer pointed by buf.
676 */
677 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
678 {
679 int ret, buf_size;
680
681 buf_size = size;
682
683 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
684 if (cmd_ctx->llm == NULL) {
685 perror("zmalloc");
686 ret = -ENOMEM;
687 goto error;
688 }
689
690 /* Copy common data */
691 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
692 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
693
694 cmd_ctx->llm->data_size = size;
695 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
696
697 return buf_size;
698
699 error:
700 return ret;
701 }
702
703 /*
704 * Update the kernel poll set of all channel fd available over all tracing
705 * session. Add the wakeup pipe at the end of the set.
706 */
707 static int update_kernel_poll(struct lttng_poll_event *events)
708 {
709 int ret;
710 struct ltt_session *session;
711 struct ltt_kernel_channel *channel;
712
713 DBG("Updating kernel poll set");
714
715 session_lock_list();
716 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
717 session_lock(session);
718 if (session->kernel_session == NULL) {
719 session_unlock(session);
720 continue;
721 }
722
723 cds_list_for_each_entry(channel,
724 &session->kernel_session->channel_list.head, list) {
725 /* Add channel fd to the kernel poll set */
726 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
727 if (ret < 0) {
728 session_unlock(session);
729 goto error;
730 }
731 DBG("Channel fd %d added to kernel set", channel->fd);
732 }
733 session_unlock(session);
734 }
735 session_unlock_list();
736
737 return 0;
738
739 error:
740 session_unlock_list();
741 return -1;
742 }
743
744 /*
745 * Find the channel fd from 'fd' over all tracing session. When found, check
746 * for new channel stream and send those stream fds to the kernel consumer.
747 *
748 * Useful for CPU hotplug feature.
749 */
750 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
751 {
752 int ret = 0;
753 struct ltt_session *session;
754 struct ltt_kernel_channel *channel;
755
756 DBG("Updating kernel streams for channel fd %d", fd);
757
758 session_lock_list();
759 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
760 session_lock(session);
761 if (session->kernel_session == NULL) {
762 session_unlock(session);
763 continue;
764 }
765
766 /* This is not suppose to be 0 but this is an extra security check */
767 if (session->kernel_session->consumer_fd == 0) {
768 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
769 }
770
771 cds_list_for_each_entry(channel,
772 &session->kernel_session->channel_list.head, list) {
773 if (channel->fd == fd) {
774 DBG("Channel found, updating kernel streams");
775 ret = kernel_open_channel_stream(channel);
776 if (ret < 0) {
777 goto error;
778 }
779
780 /*
781 * Have we already sent fds to the consumer? If yes, it means
782 * that tracing is started so it is safe to send our updated
783 * stream fds.
784 */
785 if (session->kernel_session->consumer_fds_sent == 1) {
786 ret = send_kconsumer_channel_streams(consumer_data,
787 session->kernel_session->consumer_fd, channel,
788 session->uid, session->gid);
789 if (ret < 0) {
790 goto error;
791 }
792 }
793 goto error;
794 }
795 }
796 session_unlock(session);
797 }
798 session_unlock_list();
799 return ret;
800
801 error:
802 session_unlock(session);
803 session_unlock_list();
804 return ret;
805 }
806
807 /*
808 * For each tracing session, update newly registered apps.
809 */
810 static void update_ust_app(int app_sock)
811 {
812 struct ltt_session *sess, *stmp;
813
814 /* For all tracing session(s) */
815 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
816 if (sess->ust_session) {
817 ust_app_global_update(sess->ust_session, app_sock);
818 }
819 }
820 }
821
822 /*
823 * This thread manage event coming from the kernel.
824 *
825 * Features supported in this thread:
826 * -) CPU Hotplug
827 */
828 static void *thread_manage_kernel(void *data)
829 {
830 int ret, i, pollfd, update_poll_flag = 1;
831 uint32_t revents, nb_fd;
832 char tmp;
833 struct lttng_poll_event events;
834
835 DBG("Thread manage kernel started");
836
837 ret = create_thread_poll_set(&events, 2);
838 if (ret < 0) {
839 goto error;
840 }
841
842 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
843 if (ret < 0) {
844 goto error;
845 }
846
847 while (1) {
848 if (update_poll_flag == 1) {
849 /*
850 * Reset number of fd in the poll set. Always 2 since there is the thread
851 * quit pipe and the kernel pipe.
852 */
853 events.nb_fd = 2;
854
855 ret = update_kernel_poll(&events);
856 if (ret < 0) {
857 goto error;
858 }
859 update_poll_flag = 0;
860 }
861
862 nb_fd = LTTNG_POLL_GETNB(&events);
863
864 DBG("Thread kernel polling on %d fds", nb_fd);
865
866 /* Zeroed the poll events */
867 lttng_poll_reset(&events);
868
869 /* Poll infinite value of time */
870 ret = lttng_poll_wait(&events, -1);
871 if (ret < 0) {
872 goto error;
873 } else if (ret == 0) {
874 /* Should not happen since timeout is infinite */
875 ERR("Return value of poll is 0 with an infinite timeout.\n"
876 "This should not have happened! Continuing...");
877 continue;
878 }
879
880 for (i = 0; i < nb_fd; i++) {
881 /* Fetch once the poll data */
882 revents = LTTNG_POLL_GETEV(&events, i);
883 pollfd = LTTNG_POLL_GETFD(&events, i);
884
885 /* Thread quit pipe has been closed. Killing thread. */
886 ret = check_thread_quit_pipe(pollfd, revents);
887 if (ret) {
888 goto error;
889 }
890
891 /* Check for data on kernel pipe */
892 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
893 ret = read(kernel_poll_pipe[0], &tmp, 1);
894 update_poll_flag = 1;
895 continue;
896 } else {
897 /*
898 * New CPU detected by the kernel. Adding kernel stream to
899 * kernel session and updating the kernel consumer
900 */
901 if (revents & LPOLLIN) {
902 ret = update_kernel_stream(&kconsumer_data, pollfd);
903 if (ret < 0) {
904 continue;
905 }
906 break;
907 /*
908 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
909 * and unregister kernel stream at this point.
910 */
911 }
912 }
913 }
914 }
915
916 error:
917 DBG("Kernel thread dying");
918 close(kernel_poll_pipe[0]);
919 close(kernel_poll_pipe[1]);
920
921 lttng_poll_clean(&events);
922
923 return NULL;
924 }
925
926 /*
927 * This thread manage the consumer error sent back to the session daemon.
928 */
929 static void *thread_manage_consumer(void *data)
930 {
931 int sock = 0, i, ret, pollfd;
932 uint32_t revents, nb_fd;
933 enum lttcomm_return_code code;
934 struct lttng_poll_event events;
935 struct consumer_data *consumer_data = data;
936
937 DBG("[thread] Manage consumer started");
938
939 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
940 if (ret < 0) {
941 goto error;
942 }
943
944 /*
945 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
946 * Nothing more will be added to this poll set.
947 */
948 ret = create_thread_poll_set(&events, 2);
949 if (ret < 0) {
950 goto error;
951 }
952
953 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
954 if (ret < 0) {
955 goto error;
956 }
957
958 nb_fd = LTTNG_POLL_GETNB(&events);
959
960 /* Inifinite blocking call, waiting for transmission */
961 ret = lttng_poll_wait(&events, -1);
962 if (ret < 0) {
963 goto error;
964 }
965
966 for (i = 0; i < nb_fd; i++) {
967 /* Fetch once the poll data */
968 revents = LTTNG_POLL_GETEV(&events, i);
969 pollfd = LTTNG_POLL_GETFD(&events, i);
970
971 /* Thread quit pipe has been closed. Killing thread. */
972 ret = check_thread_quit_pipe(pollfd, revents);
973 if (ret) {
974 goto error;
975 }
976
977 /* Event on the registration socket */
978 if (pollfd == consumer_data->err_sock) {
979 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
980 ERR("consumer err socket poll error");
981 goto error;
982 }
983 }
984 }
985
986 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
987 if (sock < 0) {
988 goto error;
989 }
990
991 DBG2("Receiving code from consumer err_sock");
992
993 /* Getting status code from kconsumerd */
994 ret = lttcomm_recv_unix_sock(sock, &code,
995 sizeof(enum lttcomm_return_code));
996 if (ret <= 0) {
997 goto error;
998 }
999
1000 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1001 consumer_data->cmd_sock =
1002 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1003 if (consumer_data->cmd_sock < 0) {
1004 sem_post(&consumer_data->sem);
1005 PERROR("consumer connect");
1006 goto error;
1007 }
1008 /* Signal condition to tell that the kconsumerd is ready */
1009 sem_post(&consumer_data->sem);
1010 DBG("consumer command socket ready");
1011 } else {
1012 ERR("consumer error when waiting for SOCK_READY : %s",
1013 lttcomm_get_readable_code(-code));
1014 goto error;
1015 }
1016
1017 /* Remove the kconsumerd error sock since we've established a connexion */
1018 ret = lttng_poll_del(&events, consumer_data->err_sock);
1019 if (ret < 0) {
1020 goto error;
1021 }
1022
1023 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1024 if (ret < 0) {
1025 goto error;
1026 }
1027
1028 /* Update number of fd */
1029 nb_fd = LTTNG_POLL_GETNB(&events);
1030
1031 /* Inifinite blocking call, waiting for transmission */
1032 ret = lttng_poll_wait(&events, -1);
1033 if (ret < 0) {
1034 goto error;
1035 }
1036
1037 for (i = 0; i < nb_fd; i++) {
1038 /* Fetch once the poll data */
1039 revents = LTTNG_POLL_GETEV(&events, i);
1040 pollfd = LTTNG_POLL_GETFD(&events, i);
1041
1042 /* Thread quit pipe has been closed. Killing thread. */
1043 ret = check_thread_quit_pipe(pollfd, revents);
1044 if (ret) {
1045 goto error;
1046 }
1047
1048 /* Event on the kconsumerd socket */
1049 if (pollfd == sock) {
1050 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1051 ERR("consumer err socket second poll error");
1052 goto error;
1053 }
1054 }
1055 }
1056
1057 /* Wait for any kconsumerd error */
1058 ret = lttcomm_recv_unix_sock(sock, &code,
1059 sizeof(enum lttcomm_return_code));
1060 if (ret <= 0) {
1061 ERR("consumer closed the command socket");
1062 goto error;
1063 }
1064
1065 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1066
1067 error:
1068 DBG("consumer thread dying");
1069 close(consumer_data->err_sock);
1070 close(consumer_data->cmd_sock);
1071 close(sock);
1072
1073 unlink(consumer_data->err_unix_sock_path);
1074 unlink(consumer_data->cmd_unix_sock_path);
1075 consumer_data->pid = 0;
1076
1077 lttng_poll_clean(&events);
1078
1079 return NULL;
1080 }
1081
1082 /*
1083 * This thread manage application communication.
1084 */
1085 static void *thread_manage_apps(void *data)
1086 {
1087 int i, ret, pollfd;
1088 uint32_t revents, nb_fd;
1089 struct ust_command ust_cmd;
1090 struct lttng_poll_event events;
1091
1092 DBG("[thread] Manage application started");
1093
1094 rcu_register_thread();
1095 rcu_thread_online();
1096
1097 ret = create_thread_poll_set(&events, 2);
1098 if (ret < 0) {
1099 goto error;
1100 }
1101
1102 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1103 if (ret < 0) {
1104 goto error;
1105 }
1106
1107 while (1) {
1108 /* Zeroed the events structure */
1109 lttng_poll_reset(&events);
1110
1111 nb_fd = LTTNG_POLL_GETNB(&events);
1112
1113 DBG("Apps thread polling on %d fds", nb_fd);
1114
1115 /* Inifinite blocking call, waiting for transmission */
1116 ret = lttng_poll_wait(&events, -1);
1117 if (ret < 0) {
1118 goto error;
1119 }
1120
1121 for (i = 0; i < nb_fd; i++) {
1122 /* Fetch once the poll data */
1123 revents = LTTNG_POLL_GETEV(&events, i);
1124 pollfd = LTTNG_POLL_GETFD(&events, i);
1125
1126 /* Thread quit pipe has been closed. Killing thread. */
1127 ret = check_thread_quit_pipe(pollfd, revents);
1128 if (ret) {
1129 goto error;
1130 }
1131
1132 /* Inspect the apps cmd pipe */
1133 if (pollfd == apps_cmd_pipe[0]) {
1134 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1135 ERR("Apps command pipe error");
1136 goto error;
1137 } else if (revents & LPOLLIN) {
1138 /* Empty pipe */
1139 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1140 if (ret < 0 || ret < sizeof(ust_cmd)) {
1141 perror("read apps cmd pipe");
1142 goto error;
1143 }
1144
1145 /* Register applicaton to the session daemon */
1146 ret = ust_app_register(&ust_cmd.reg_msg,
1147 ust_cmd.sock);
1148 if (ret == -ENOMEM) {
1149 goto error;
1150 } else if (ret < 0) {
1151 break;
1152 }
1153
1154 /*
1155 * Add channel(s) and event(s) to newly registered apps
1156 * from lttng global UST domain.
1157 */
1158 update_ust_app(ust_cmd.sock);
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 */
1172 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1173 if (ret < 0) {
1174 goto error;
1175 }
1176
1177 DBG("Apps with sock %d added to poll set",
1178 ust_cmd.sock);
1179 }
1180
1181 break;
1182 }
1183 } else {
1184 /*
1185 * At this point, we know that a registered application made
1186 * the event at poll_wait.
1187 */
1188 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1189 /* Removing from the poll set */
1190 ret = lttng_poll_del(&events, pollfd);
1191 if (ret < 0) {
1192 goto error;
1193 }
1194
1195 /* Socket closed on remote end. */
1196 ust_app_unregister(pollfd);
1197 break;
1198 }
1199 }
1200 }
1201 }
1202
1203 error:
1204 DBG("Application communication apps dying");
1205 close(apps_cmd_pipe[0]);
1206 close(apps_cmd_pipe[1]);
1207
1208 lttng_poll_clean(&events);
1209
1210 rcu_thread_offline();
1211 rcu_unregister_thread();
1212 return NULL;
1213 }
1214
1215 /*
1216 * Dispatch request from the registration threads to the application
1217 * communication thread.
1218 */
1219 static void *thread_dispatch_ust_registration(void *data)
1220 {
1221 int ret;
1222 struct cds_wfq_node *node;
1223 struct ust_command *ust_cmd = NULL;
1224
1225 DBG("[thread] Dispatch UST command started");
1226
1227 while (!dispatch_thread_exit) {
1228 /* Atomically prepare the queue futex */
1229 futex_nto1_prepare(&ust_cmd_queue.futex);
1230
1231 do {
1232 /* Dequeue command for registration */
1233 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1234 if (node == NULL) {
1235 DBG("Woken up but nothing in the UST command queue");
1236 /* Continue thread execution */
1237 break;
1238 }
1239
1240 ust_cmd = caa_container_of(node, struct ust_command, node);
1241
1242 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1243 " gid:%d sock:%d name:%s (version %d.%d)",
1244 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1245 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1246 ust_cmd->sock, ust_cmd->reg_msg.name,
1247 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1248 /*
1249 * Inform apps thread of the new application registration. This
1250 * call is blocking so we can be assured that the data will be read
1251 * at some point in time or wait to the end of the world :)
1252 */
1253 ret = write(apps_cmd_pipe[1], ust_cmd,
1254 sizeof(struct ust_command));
1255 if (ret < 0) {
1256 perror("write apps cmd pipe");
1257 if (errno == EBADF) {
1258 /*
1259 * We can't inform the application thread to process
1260 * registration. We will exit or else application
1261 * registration will not occur and tracing will never
1262 * start.
1263 */
1264 goto error;
1265 }
1266 }
1267 free(ust_cmd);
1268 } while (node != NULL);
1269
1270 /* Futex wait on queue. Blocking call on futex() */
1271 futex_nto1_wait(&ust_cmd_queue.futex);
1272 }
1273
1274 error:
1275 DBG("Dispatch thread dying");
1276 return NULL;
1277 }
1278
1279 /*
1280 * This thread manage application registration.
1281 */
1282 static void *thread_registration_apps(void *data)
1283 {
1284 int sock = 0, i, ret, pollfd;
1285 uint32_t revents, nb_fd;
1286 struct lttng_poll_event events;
1287 /*
1288 * Get allocated in this thread, enqueued to a global queue, dequeued and
1289 * freed in the manage apps thread.
1290 */
1291 struct ust_command *ust_cmd = NULL;
1292
1293 DBG("[thread] Manage application registration started");
1294
1295 ret = lttcomm_listen_unix_sock(apps_sock);
1296 if (ret < 0) {
1297 goto error;
1298 }
1299
1300 /*
1301 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1302 * more will be added to this poll set.
1303 */
1304 ret = create_thread_poll_set(&events, 2);
1305 if (ret < 0) {
1306 goto error;
1307 }
1308
1309 /* Add the application registration socket */
1310 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1311 if (ret < 0) {
1312 goto error;
1313 }
1314
1315 /* Notify all applications to register */
1316 ret = notify_ust_apps(1);
1317 if (ret < 0) {
1318 ERR("Failed to notify applications or create the wait shared memory.\n"
1319 "Execution continues but there might be problem for already\n"
1320 "running applications that wishes to register.");
1321 }
1322
1323 while (1) {
1324 DBG("Accepting application registration");
1325
1326 nb_fd = LTTNG_POLL_GETNB(&events);
1327
1328 /* Inifinite blocking call, waiting for transmission */
1329 ret = lttng_poll_wait(&events, -1);
1330 if (ret < 0) {
1331 goto error;
1332 }
1333
1334 for (i = 0; i < nb_fd; i++) {
1335 /* Fetch once the poll data */
1336 revents = LTTNG_POLL_GETEV(&events, i);
1337 pollfd = LTTNG_POLL_GETFD(&events, i);
1338
1339 /* Thread quit pipe has been closed. Killing thread. */
1340 ret = check_thread_quit_pipe(pollfd, revents);
1341 if (ret) {
1342 goto error;
1343 }
1344
1345 /* Event on the registration socket */
1346 if (pollfd == apps_sock) {
1347 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1348 ERR("Register apps socket poll error");
1349 goto error;
1350 } else if (revents & LPOLLIN) {
1351 sock = lttcomm_accept_unix_sock(apps_sock);
1352 if (sock < 0) {
1353 goto error;
1354 }
1355
1356 /* Create UST registration command for enqueuing */
1357 ust_cmd = zmalloc(sizeof(struct ust_command));
1358 if (ust_cmd == NULL) {
1359 perror("ust command zmalloc");
1360 goto error;
1361 }
1362
1363 /*
1364 * Using message-based transmissions to ensure we don't
1365 * have to deal with partially received messages.
1366 */
1367 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1368 sizeof(struct ust_register_msg));
1369 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1370 if (ret < 0) {
1371 perror("lttcomm_recv_unix_sock register apps");
1372 } else {
1373 ERR("Wrong size received on apps register");
1374 }
1375 free(ust_cmd);
1376 close(sock);
1377 continue;
1378 }
1379
1380 ust_cmd->sock = sock;
1381
1382 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1383 " gid:%d sock:%d name:%s (version %d.%d)",
1384 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1385 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1386 ust_cmd->sock, ust_cmd->reg_msg.name,
1387 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1388
1389 /*
1390 * Lock free enqueue the registration request. The red pill
1391 * has been taken! This apps will be part of the *system*.
1392 */
1393 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1394
1395 /*
1396 * Wake the registration queue futex. Implicit memory
1397 * barrier with the exchange in cds_wfq_enqueue.
1398 */
1399 futex_nto1_wake(&ust_cmd_queue.futex);
1400 }
1401 }
1402 }
1403 }
1404
1405 error:
1406 DBG("UST Registration thread dying");
1407
1408 /* Notify that the registration thread is gone */
1409 notify_ust_apps(0);
1410
1411 close(apps_sock);
1412 close(sock);
1413 unlink(apps_unix_sock_path);
1414
1415 lttng_poll_clean(&events);
1416
1417 return NULL;
1418 }
1419
1420 /*
1421 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1422 * exec or it will fails.
1423 */
1424 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1425 {
1426 int ret;
1427 struct timespec timeout;
1428
1429 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1430 timeout.tv_nsec = 0;
1431
1432 /* Setup semaphore */
1433 ret = sem_init(&consumer_data->sem, 0, 0);
1434 if (ret < 0) {
1435 PERROR("sem_init consumer semaphore");
1436 goto error;
1437 }
1438
1439 ret = pthread_create(&consumer_data->thread, NULL,
1440 thread_manage_consumer, consumer_data);
1441 if (ret != 0) {
1442 PERROR("pthread_create consumer");
1443 ret = -1;
1444 goto error;
1445 }
1446
1447 /* Get time for sem_timedwait absolute timeout */
1448 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1449 if (ret < 0) {
1450 PERROR("clock_gettime spawn consumer");
1451 /* Infinite wait for the kconsumerd thread to be ready */
1452 ret = sem_wait(&consumer_data->sem);
1453 } else {
1454 /* Normal timeout if the gettime was successful */
1455 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1456 ret = sem_timedwait(&consumer_data->sem, &timeout);
1457 }
1458
1459 if (ret < 0) {
1460 if (errno == ETIMEDOUT) {
1461 /*
1462 * Call has timed out so we kill the kconsumerd_thread and return
1463 * an error.
1464 */
1465 ERR("The consumer thread was never ready. Killing it");
1466 ret = pthread_cancel(consumer_data->thread);
1467 if (ret < 0) {
1468 PERROR("pthread_cancel consumer thread");
1469 }
1470 } else {
1471 PERROR("semaphore wait failed consumer thread");
1472 }
1473 goto error;
1474 }
1475
1476 pthread_mutex_lock(&consumer_data->pid_mutex);
1477 if (consumer_data->pid == 0) {
1478 ERR("Kconsumerd did not start");
1479 pthread_mutex_unlock(&consumer_data->pid_mutex);
1480 goto error;
1481 }
1482 pthread_mutex_unlock(&consumer_data->pid_mutex);
1483
1484 return 0;
1485
1486 error:
1487 return ret;
1488 }
1489
1490 /*
1491 * Join consumer thread
1492 */
1493 static int join_consumer_thread(struct consumer_data *consumer_data)
1494 {
1495 void *status;
1496 int ret;
1497
1498 if (consumer_data->pid != 0) {
1499 ret = kill(consumer_data->pid, SIGTERM);
1500 if (ret) {
1501 ERR("Error killing consumer daemon");
1502 return ret;
1503 }
1504 return pthread_join(consumer_data->thread, &status);
1505 } else {
1506 return 0;
1507 }
1508 }
1509
1510 /*
1511 * Fork and exec a consumer daemon (consumerd).
1512 *
1513 * Return pid if successful else -1.
1514 */
1515 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1516 {
1517 int ret;
1518 pid_t pid;
1519 const char *consumer_to_use;
1520 const char *verbosity;
1521 struct stat st;
1522
1523 DBG("Spawning consumerd");
1524
1525 pid = fork();
1526 if (pid == 0) {
1527 /*
1528 * Exec consumerd.
1529 */
1530 if (opt_verbose_consumer) {
1531 verbosity = "--verbose";
1532 } else {
1533 verbosity = "--quiet";
1534 }
1535 switch (consumer_data->type) {
1536 case LTTNG_CONSUMER_KERNEL:
1537 /*
1538 * Find out which consumerd to execute. We will
1539 * first try the 64-bit path, then the
1540 * sessiond's installation directory, and
1541 * fallback on the 32-bit one,
1542 */
1543 DBG3("Looking for a kernel consumer at these locations:");
1544 DBG3(" 1) %s", consumerd64_bin);
1545 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1546 DBG3(" 3) %s", consumerd32_bin);
1547 if (stat(consumerd64_bin, &st) == 0) {
1548 DBG3("Found location #1");
1549 consumer_to_use = consumerd64_bin;
1550 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1551 DBG3("Found location #2");
1552 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1553 } else if (stat(consumerd32_bin, &st) == 0) {
1554 DBG3("Found location #3");
1555 consumer_to_use = consumerd32_bin;
1556 } else {
1557 DBG("Could not find any valid consumerd executable");
1558 break;
1559 }
1560 DBG("Using kernel consumer at: %s", consumer_to_use);
1561 execl(consumer_to_use,
1562 "lttng-consumerd", verbosity, "-k",
1563 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1564 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1565 NULL);
1566 break;
1567 case LTTNG_CONSUMER64_UST:
1568 {
1569 char *tmpnew = NULL;
1570
1571 if (consumerd64_libdir[0] != '\0') {
1572 char *tmp;
1573 size_t tmplen;
1574
1575 tmp = getenv("LD_LIBRARY_PATH");
1576 if (!tmp) {
1577 tmp = "";
1578 }
1579 tmplen = strlen("LD_LIBRARY_PATH=")
1580 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1581 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1582 if (!tmpnew) {
1583 ret = -ENOMEM;
1584 goto error;
1585 }
1586 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1587 strcat(tmpnew, consumerd64_libdir);
1588 if (tmp[0] != '\0') {
1589 strcat(tmpnew, ":");
1590 strcat(tmpnew, tmp);
1591 }
1592 ret = putenv(tmpnew);
1593 if (ret) {
1594 ret = -errno;
1595 goto error;
1596 }
1597 }
1598 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1599 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1600 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1601 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1602 NULL);
1603 if (consumerd64_libdir[0] != '\0') {
1604 free(tmpnew);
1605 }
1606 if (ret) {
1607 goto error;
1608 }
1609 break;
1610 }
1611 case LTTNG_CONSUMER32_UST:
1612 {
1613 char *tmpnew = NULL;
1614
1615 if (consumerd32_libdir[0] != '\0') {
1616 char *tmp;
1617 size_t tmplen;
1618
1619 tmp = getenv("LD_LIBRARY_PATH");
1620 if (!tmp) {
1621 tmp = "";
1622 }
1623 tmplen = strlen("LD_LIBRARY_PATH=")
1624 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1625 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1626 if (!tmpnew) {
1627 ret = -ENOMEM;
1628 goto error;
1629 }
1630 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1631 strcat(tmpnew, consumerd32_libdir);
1632 if (tmp[0] != '\0') {
1633 strcat(tmpnew, ":");
1634 strcat(tmpnew, tmp);
1635 }
1636 ret = putenv(tmpnew);
1637 if (ret) {
1638 ret = -errno;
1639 goto error;
1640 }
1641 }
1642 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1643 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1644 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1645 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1646 NULL);
1647 if (consumerd32_libdir[0] != '\0') {
1648 free(tmpnew);
1649 }
1650 if (ret) {
1651 goto error;
1652 }
1653 break;
1654 }
1655 default:
1656 perror("unknown consumer type");
1657 exit(EXIT_FAILURE);
1658 }
1659 if (errno != 0) {
1660 perror("kernel start consumer exec");
1661 }
1662 exit(EXIT_FAILURE);
1663 } else if (pid > 0) {
1664 ret = pid;
1665 } else {
1666 perror("start consumer fork");
1667 ret = -errno;
1668 }
1669 error:
1670 return ret;
1671 }
1672
1673 /*
1674 * Spawn the consumerd daemon and session daemon thread.
1675 */
1676 static int start_consumerd(struct consumer_data *consumer_data)
1677 {
1678 int ret;
1679
1680 pthread_mutex_lock(&consumer_data->pid_mutex);
1681 if (consumer_data->pid != 0) {
1682 pthread_mutex_unlock(&consumer_data->pid_mutex);
1683 goto end;
1684 }
1685
1686 ret = spawn_consumerd(consumer_data);
1687 if (ret < 0) {
1688 ERR("Spawning consumerd failed");
1689 pthread_mutex_unlock(&consumer_data->pid_mutex);
1690 goto error;
1691 }
1692
1693 /* Setting up the consumer_data pid */
1694 consumer_data->pid = ret;
1695 DBG2("Consumer pid %d", consumer_data->pid);
1696 pthread_mutex_unlock(&consumer_data->pid_mutex);
1697
1698 DBG2("Spawning consumer control thread");
1699 ret = spawn_consumer_thread(consumer_data);
1700 if (ret < 0) {
1701 ERR("Fatal error spawning consumer control thread");
1702 goto error;
1703 }
1704
1705 end:
1706 return 0;
1707
1708 error:
1709 return ret;
1710 }
1711
1712 /*
1713 * modprobe_kernel_modules
1714 */
1715 static int modprobe_kernel_modules(void)
1716 {
1717 int ret = 0, i;
1718 char modprobe[256];
1719
1720 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1721 ret = snprintf(modprobe, sizeof(modprobe),
1722 "/sbin/modprobe %s%s",
1723 kernel_modules_list[i].required ? "" : "-q ",
1724 kernel_modules_list[i].name);
1725 if (ret < 0) {
1726 perror("snprintf modprobe");
1727 goto error;
1728 }
1729 modprobe[sizeof(modprobe) - 1] = '\0';
1730 ret = system(modprobe);
1731 if (ret == -1) {
1732 ERR("Unable to launch modprobe for module %s",
1733 kernel_modules_list[i].name);
1734 } else if (kernel_modules_list[i].required
1735 && WEXITSTATUS(ret) != 0) {
1736 ERR("Unable to load module %s",
1737 kernel_modules_list[i].name);
1738 } else {
1739 DBG("Modprobe successfully %s",
1740 kernel_modules_list[i].name);
1741 }
1742 }
1743
1744 error:
1745 return ret;
1746 }
1747
1748 /*
1749 * mount_debugfs
1750 */
1751 static int mount_debugfs(char *path)
1752 {
1753 int ret;
1754 char *type = "debugfs";
1755
1756 ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1757 if (ret < 0) {
1758 PERROR("Cannot create debugfs path");
1759 goto error;
1760 }
1761
1762 ret = mount(type, path, type, 0, NULL);
1763 if (ret < 0) {
1764 PERROR("Cannot mount debugfs");
1765 goto error;
1766 }
1767
1768 DBG("Mounted debugfs successfully at %s", path);
1769
1770 error:
1771 return ret;
1772 }
1773
1774 /*
1775 * Setup necessary data for kernel tracer action.
1776 */
1777 static void init_kernel_tracer(void)
1778 {
1779 int ret;
1780 char *proc_mounts = "/proc/mounts";
1781 char line[256];
1782 char *debugfs_path = NULL, *lttng_path = NULL;
1783 FILE *fp;
1784
1785 /* Detect debugfs */
1786 fp = fopen(proc_mounts, "r");
1787 if (fp == NULL) {
1788 ERR("Unable to probe %s", proc_mounts);
1789 goto error;
1790 }
1791
1792 while (fgets(line, sizeof(line), fp) != NULL) {
1793 if (strstr(line, "debugfs") != NULL) {
1794 /* Remove first string */
1795 strtok(line, " ");
1796 /* Dup string here so we can reuse line later on */
1797 debugfs_path = strdup(strtok(NULL, " "));
1798 DBG("Got debugfs path : %s", debugfs_path);
1799 break;
1800 }
1801 }
1802
1803 fclose(fp);
1804
1805 /* Mount debugfs if needded */
1806 if (debugfs_path == NULL) {
1807 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1808 if (ret < 0) {
1809 perror("asprintf debugfs path");
1810 goto error;
1811 }
1812 ret = mount_debugfs(debugfs_path);
1813 if (ret < 0) {
1814 perror("Cannot mount debugfs");
1815 goto error;
1816 }
1817 }
1818
1819 /* Modprobe lttng kernel modules */
1820 ret = modprobe_kernel_modules();
1821 if (ret < 0) {
1822 goto error;
1823 }
1824
1825 /* Setup lttng kernel path */
1826 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1827 if (ret < 0) {
1828 perror("asprintf lttng path");
1829 goto error;
1830 }
1831
1832 /* Open debugfs lttng */
1833 kernel_tracer_fd = open(lttng_path, O_RDWR);
1834 if (kernel_tracer_fd < 0) {
1835 DBG("Failed to open %s", lttng_path);
1836 goto error;
1837 }
1838
1839 free(lttng_path);
1840 free(debugfs_path);
1841 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1842 return;
1843
1844 error:
1845 if (lttng_path) {
1846 free(lttng_path);
1847 }
1848 if (debugfs_path) {
1849 free(debugfs_path);
1850 }
1851 WARN("No kernel tracer available");
1852 kernel_tracer_fd = 0;
1853 return;
1854 }
1855
1856 /*
1857 * Init tracing by creating trace directory and sending fds kernel consumer.
1858 */
1859 static int init_kernel_tracing(struct ltt_kernel_session *session)
1860 {
1861 int ret = 0;
1862
1863 if (session->consumer_fds_sent == 0) {
1864 /*
1865 * Assign default kernel consumer socket if no consumer assigned to the
1866 * kernel session. At this point, it's NOT suppose to be 0 but this is
1867 * an extra security check.
1868 */
1869 if (session->consumer_fd == 0) {
1870 session->consumer_fd = kconsumer_data.cmd_sock;
1871 }
1872
1873 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1874 if (ret < 0) {
1875 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1876 goto error;
1877 }
1878
1879 session->consumer_fds_sent = 1;
1880 }
1881
1882 error:
1883 return ret;
1884 }
1885
1886 /*
1887 * Create an UST session and add it to the session ust list.
1888 */
1889 static int create_ust_session(struct ltt_session *session,
1890 struct lttng_domain *domain)
1891 {
1892 struct ltt_ust_session *lus = NULL;
1893 int ret;
1894
1895 switch (domain->type) {
1896 case LTTNG_DOMAIN_UST:
1897 break;
1898 default:
1899 ret = LTTCOMM_UNKNOWN_DOMAIN;
1900 goto error;
1901 }
1902
1903 DBG("Creating UST session");
1904
1905 lus = trace_ust_create_session(session->path, session->id, domain);
1906 if (lus == NULL) {
1907 ret = LTTCOMM_UST_SESS_FAIL;
1908 goto error;
1909 }
1910
1911 ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG,
1912 session->uid, session->gid);
1913 if (ret < 0) {
1914 if (ret != -EEXIST) {
1915 ERR("Trace directory creation error");
1916 ret = LTTCOMM_UST_SESS_FAIL;
1917 goto error;
1918 }
1919 }
1920
1921 /* The domain type dictate different actions on session creation */
1922 switch (domain->type) {
1923 case LTTNG_DOMAIN_UST:
1924 /* No ustctl for the global UST domain */
1925 break;
1926 default:
1927 ERR("Unknown UST domain on create session %d", domain->type);
1928 goto error;
1929 }
1930 lus->uid = session->uid;
1931 lus->gid = session->gid;
1932 session->ust_session = lus;
1933
1934 return LTTCOMM_OK;
1935
1936 error:
1937 free(lus);
1938 return ret;
1939 }
1940
1941 /*
1942 * Create a kernel tracer session then create the default channel.
1943 */
1944 static int create_kernel_session(struct ltt_session *session)
1945 {
1946 int ret;
1947
1948 DBG("Creating kernel session");
1949
1950 ret = kernel_create_session(session, kernel_tracer_fd);
1951 if (ret < 0) {
1952 ret = LTTCOMM_KERN_SESS_FAIL;
1953 goto error;
1954 }
1955
1956 /* Set kernel consumer socket fd */
1957 if (kconsumer_data.cmd_sock) {
1958 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1959 }
1960
1961 ret = mkdir_recursive_run_as(session->kernel_session->trace_path,
1962 S_IRWXU | S_IRWXG, session->uid, session->gid);
1963 if (ret < 0) {
1964 if (ret != -EEXIST) {
1965 ERR("Trace directory creation error");
1966 goto error;
1967 }
1968 }
1969 session->kernel_session->uid = session->uid;
1970 session->kernel_session->gid = session->gid;
1971
1972 error:
1973 return ret;
1974 }
1975
1976 /*
1977 * Check if the UID or GID match the session. Root user has access to
1978 * all sessions.
1979 */
1980 static int session_access_ok(struct ltt_session *session,
1981 uid_t uid, gid_t gid)
1982 {
1983 if (uid != session->uid && gid != session->gid
1984 && uid != 0) {
1985 return 0;
1986 } else {
1987 return 1;
1988 }
1989 }
1990
1991 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1992 {
1993 unsigned int i = 0;
1994 struct ltt_session *session;
1995
1996 DBG("Counting number of available session for UID %d GID %d",
1997 uid, gid);
1998 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1999 /*
2000 * Only list the sessions the user can control.
2001 */
2002 if (!session_access_ok(session, uid, gid)) {
2003 continue;
2004 }
2005 i++;
2006 }
2007 return i;
2008 }
2009
2010 /*
2011 * Using the session list, filled a lttng_session array to send back to the
2012 * client for session listing.
2013 *
2014 * The session list lock MUST be acquired before calling this function. Use
2015 * session_lock_list() and session_unlock_list().
2016 */
2017 static void list_lttng_sessions(struct lttng_session *sessions,
2018 uid_t uid, gid_t gid)
2019 {
2020 unsigned int i = 0;
2021 struct ltt_session *session;
2022
2023 DBG("Getting all available session for UID %d GID %d",
2024 uid, gid);
2025 /*
2026 * Iterate over session list and append data after the control struct in
2027 * the buffer.
2028 */
2029 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2030 /*
2031 * Only list the sessions the user can control.
2032 */
2033 if (!session_access_ok(session, uid, gid)) {
2034 continue;
2035 }
2036 strncpy(sessions[i].path, session->path, PATH_MAX);
2037 sessions[i].path[PATH_MAX - 1] = '\0';
2038 strncpy(sessions[i].name, session->name, NAME_MAX);
2039 sessions[i].name[NAME_MAX - 1] = '\0';
2040 sessions[i].enabled = session->enabled;
2041 i++;
2042 }
2043 }
2044
2045 /*
2046 * Fill lttng_channel array of all channels.
2047 */
2048 static void list_lttng_channels(int domain, struct ltt_session *session,
2049 struct lttng_channel *channels)
2050 {
2051 int i = 0;
2052 struct ltt_kernel_channel *kchan;
2053
2054 DBG("Listing channels for session %s", session->name);
2055
2056 switch (domain) {
2057 case LTTNG_DOMAIN_KERNEL:
2058 /* Kernel channels */
2059 if (session->kernel_session != NULL) {
2060 cds_list_for_each_entry(kchan,
2061 &session->kernel_session->channel_list.head, list) {
2062 /* Copy lttng_channel struct to array */
2063 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2064 channels[i].enabled = kchan->enabled;
2065 i++;
2066 }
2067 }
2068 break;
2069 case LTTNG_DOMAIN_UST:
2070 {
2071 struct lttng_ht_iter iter;
2072 struct ltt_ust_channel *uchan;
2073
2074 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2075 &iter.iter, uchan, node.node) {
2076 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2077 channels[i].attr.overwrite = uchan->attr.overwrite;
2078 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2079 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2080 channels[i].attr.switch_timer_interval =
2081 uchan->attr.switch_timer_interval;
2082 channels[i].attr.read_timer_interval =
2083 uchan->attr.read_timer_interval;
2084 channels[i].enabled = uchan->enabled;
2085 switch (uchan->attr.output) {
2086 case LTTNG_UST_MMAP:
2087 default:
2088 channels[i].attr.output = LTTNG_EVENT_MMAP;
2089 break;
2090 }
2091 i++;
2092 }
2093 break;
2094 }
2095 default:
2096 break;
2097 }
2098 }
2099
2100 /*
2101 * Create a list of ust global domain events.
2102 */
2103 static int list_lttng_ust_global_events(char *channel_name,
2104 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2105 {
2106 int i = 0, ret = 0;
2107 unsigned int nb_event = 0;
2108 struct lttng_ht_iter iter;
2109 struct lttng_ht_node_str *node;
2110 struct ltt_ust_channel *uchan;
2111 struct ltt_ust_event *uevent;
2112 struct lttng_event *tmp;
2113
2114 DBG("Listing UST global events for channel %s", channel_name);
2115
2116 rcu_read_lock();
2117
2118 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2119 node = lttng_ht_iter_get_node_str(&iter);
2120 if (node == NULL) {
2121 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2122 goto error;
2123 }
2124
2125 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2126
2127 nb_event += lttng_ht_get_count(uchan->events);
2128
2129 if (nb_event == 0) {
2130 ret = nb_event;
2131 goto error;
2132 }
2133
2134 DBG3("Listing UST global %d events", nb_event);
2135
2136 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2137 if (tmp == NULL) {
2138 ret = -LTTCOMM_FATAL;
2139 goto error;
2140 }
2141
2142 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2143 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2144 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2145 tmp[i].enabled = uevent->enabled;
2146 switch (uevent->attr.instrumentation) {
2147 case LTTNG_UST_TRACEPOINT:
2148 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2149 break;
2150 case LTTNG_UST_PROBE:
2151 tmp[i].type = LTTNG_EVENT_PROBE;
2152 break;
2153 case LTTNG_UST_FUNCTION:
2154 tmp[i].type = LTTNG_EVENT_FUNCTION;
2155 break;
2156 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2157 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2158 break;
2159 }
2160 i++;
2161 }
2162
2163 ret = nb_event;
2164 *events = tmp;
2165
2166 error:
2167 rcu_read_unlock();
2168 return ret;
2169 }
2170
2171 /*
2172 * Fill lttng_event array of all kernel events in the channel.
2173 */
2174 static int list_lttng_kernel_events(char *channel_name,
2175 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2176 {
2177 int i = 0, ret;
2178 unsigned int nb_event;
2179 struct ltt_kernel_event *event;
2180 struct ltt_kernel_channel *kchan;
2181
2182 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2183 if (kchan == NULL) {
2184 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2185 goto error;
2186 }
2187
2188 nb_event = kchan->event_count;
2189
2190 DBG("Listing events for channel %s", kchan->channel->name);
2191
2192 if (nb_event == 0) {
2193 ret = nb_event;
2194 goto error;
2195 }
2196
2197 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2198 if (*events == NULL) {
2199 ret = LTTCOMM_FATAL;
2200 goto error;
2201 }
2202
2203 /* Kernel channels */
2204 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2205 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2206 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2207 (*events)[i].enabled = event->enabled;
2208 switch (event->event->instrumentation) {
2209 case LTTNG_KERNEL_TRACEPOINT:
2210 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2211 break;
2212 case LTTNG_KERNEL_KPROBE:
2213 case LTTNG_KERNEL_KRETPROBE:
2214 (*events)[i].type = LTTNG_EVENT_PROBE;
2215 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2216 sizeof(struct lttng_kernel_kprobe));
2217 break;
2218 case LTTNG_KERNEL_FUNCTION:
2219 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2220 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2221 sizeof(struct lttng_kernel_function));
2222 break;
2223 case LTTNG_KERNEL_NOOP:
2224 (*events)[i].type = LTTNG_EVENT_NOOP;
2225 break;
2226 case LTTNG_KERNEL_SYSCALL:
2227 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2228 break;
2229 case LTTNG_KERNEL_ALL:
2230 assert(0);
2231 break;
2232 }
2233 i++;
2234 }
2235
2236 return nb_event;
2237
2238 error:
2239 return ret;
2240 }
2241
2242 /*
2243 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2244 */
2245 static int cmd_disable_channel(struct ltt_session *session,
2246 int domain, char *channel_name)
2247 {
2248 int ret;
2249 struct ltt_ust_session *usess;
2250
2251 usess = session->ust_session;
2252
2253 switch (domain) {
2254 case LTTNG_DOMAIN_KERNEL:
2255 {
2256 ret = channel_kernel_disable(session->kernel_session,
2257 channel_name);
2258 if (ret != LTTCOMM_OK) {
2259 goto error;
2260 }
2261
2262 kernel_wait_quiescent(kernel_tracer_fd);
2263 break;
2264 }
2265 case LTTNG_DOMAIN_UST:
2266 {
2267 struct ltt_ust_channel *uchan;
2268 struct lttng_ht *chan_ht;
2269
2270 chan_ht = usess->domain_global.channels;
2271
2272 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2273 if (uchan == NULL) {
2274 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2275 goto error;
2276 }
2277
2278 ret = channel_ust_disable(usess, domain, uchan);
2279 if (ret != LTTCOMM_OK) {
2280 goto error;
2281 }
2282 break;
2283 }
2284 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2285 case LTTNG_DOMAIN_UST_EXEC_NAME:
2286 case LTTNG_DOMAIN_UST_PID:
2287 ret = LTTCOMM_NOT_IMPLEMENTED;
2288 goto error;
2289 default:
2290 ret = LTTCOMM_UNKNOWN_DOMAIN;
2291 goto error;
2292 }
2293
2294 ret = LTTCOMM_OK;
2295
2296 error:
2297 return ret;
2298 }
2299
2300 /*
2301 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2302 */
2303 static int cmd_enable_channel(struct ltt_session *session,
2304 int domain, struct lttng_channel *attr)
2305 {
2306 int ret;
2307 struct ltt_ust_session *usess = session->ust_session;
2308 struct lttng_ht *chan_ht;
2309
2310 DBG("Enabling channel %s for session %s", attr->name, session->name);
2311
2312 switch (domain) {
2313 case LTTNG_DOMAIN_KERNEL:
2314 {
2315 struct ltt_kernel_channel *kchan;
2316
2317 kchan = trace_kernel_get_channel_by_name(attr->name,
2318 session->kernel_session);
2319 if (kchan == NULL) {
2320 ret = channel_kernel_create(session->kernel_session,
2321 attr, kernel_poll_pipe[1]);
2322 } else {
2323 ret = channel_kernel_enable(session->kernel_session, kchan);
2324 }
2325
2326 if (ret != LTTCOMM_OK) {
2327 goto error;
2328 }
2329
2330 kernel_wait_quiescent(kernel_tracer_fd);
2331 break;
2332 }
2333 case LTTNG_DOMAIN_UST:
2334 {
2335 struct ltt_ust_channel *uchan;
2336
2337 chan_ht = usess->domain_global.channels;
2338
2339 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2340 if (uchan == NULL) {
2341 ret = channel_ust_create(usess, domain, attr);
2342 } else {
2343 ret = channel_ust_enable(usess, domain, uchan);
2344 }
2345 break;
2346 }
2347 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2348 case LTTNG_DOMAIN_UST_EXEC_NAME:
2349 case LTTNG_DOMAIN_UST_PID:
2350 ret = LTTCOMM_NOT_IMPLEMENTED;
2351 goto error;
2352 default:
2353 ret = LTTCOMM_UNKNOWN_DOMAIN;
2354 goto error;
2355 }
2356
2357 error:
2358 return ret;
2359 }
2360
2361 /*
2362 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2363 */
2364 static int cmd_disable_event(struct ltt_session *session, int domain,
2365 char *channel_name, char *event_name)
2366 {
2367 int ret;
2368
2369 switch (domain) {
2370 case LTTNG_DOMAIN_KERNEL:
2371 {
2372 struct ltt_kernel_channel *kchan;
2373 struct ltt_kernel_session *ksess;
2374
2375 ksess = session->kernel_session;
2376
2377 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2378 if (kchan == NULL) {
2379 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2380 goto error;
2381 }
2382
2383 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2384 if (ret != LTTCOMM_OK) {
2385 goto error;
2386 }
2387
2388 kernel_wait_quiescent(kernel_tracer_fd);
2389 break;
2390 }
2391 case LTTNG_DOMAIN_UST:
2392 {
2393 struct ltt_ust_channel *uchan;
2394 struct ltt_ust_session *usess;
2395
2396 usess = session->ust_session;
2397
2398 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2399 channel_name);
2400 if (uchan == NULL) {
2401 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2402 goto error;
2403 }
2404
2405 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2406 if (ret != LTTCOMM_OK) {
2407 goto error;
2408 }
2409
2410 DBG3("Disable UST event %s in channel %s completed", event_name,
2411 channel_name);
2412 break;
2413 }
2414 case LTTNG_DOMAIN_UST_EXEC_NAME:
2415 case LTTNG_DOMAIN_UST_PID:
2416 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2417 default:
2418 ret = LTTCOMM_NOT_IMPLEMENTED;
2419 goto error;
2420 }
2421
2422 ret = LTTCOMM_OK;
2423
2424 error:
2425 return ret;
2426 }
2427
2428 /*
2429 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2430 */
2431 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2432 char *channel_name)
2433 {
2434 int ret;
2435
2436 switch (domain) {
2437 case LTTNG_DOMAIN_KERNEL:
2438 {
2439 struct ltt_kernel_session *ksess;
2440 struct ltt_kernel_channel *kchan;
2441
2442 ksess = session->kernel_session;
2443
2444 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2445 if (kchan == NULL) {
2446 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2447 goto error;
2448 }
2449
2450 ret = event_kernel_disable_all(ksess, kchan);
2451 if (ret != LTTCOMM_OK) {
2452 goto error;
2453 }
2454
2455 kernel_wait_quiescent(kernel_tracer_fd);
2456 break;
2457 }
2458 case LTTNG_DOMAIN_UST:
2459 {
2460 struct ltt_ust_session *usess;
2461 struct ltt_ust_channel *uchan;
2462
2463 usess = session->ust_session;
2464
2465 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2466 channel_name);
2467 if (uchan == NULL) {
2468 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2469 goto error;
2470 }
2471
2472 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2473 if (ret != 0) {
2474 goto error;
2475 }
2476
2477 DBG3("Disable all UST events in channel %s completed", channel_name);
2478
2479 break;
2480 }
2481 case LTTNG_DOMAIN_UST_EXEC_NAME:
2482 case LTTNG_DOMAIN_UST_PID:
2483 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2484 default:
2485 ret = LTTCOMM_NOT_IMPLEMENTED;
2486 goto error;
2487 }
2488
2489 ret = LTTCOMM_OK;
2490
2491 error:
2492 return ret;
2493 }
2494
2495 /*
2496 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2497 */
2498 static int cmd_add_context(struct ltt_session *session, int domain,
2499 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2500 {
2501 int ret;
2502
2503 switch (domain) {
2504 case LTTNG_DOMAIN_KERNEL:
2505 /* Add kernel context to kernel tracer */
2506 ret = context_kernel_add(session->kernel_session, ctx,
2507 event_name, channel_name);
2508 if (ret != LTTCOMM_OK) {
2509 goto error;
2510 }
2511 break;
2512 case LTTNG_DOMAIN_UST:
2513 {
2514 struct ltt_ust_session *usess = session->ust_session;
2515
2516 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2517 if (ret != LTTCOMM_OK) {
2518 goto error;
2519 }
2520 break;
2521 }
2522 case LTTNG_DOMAIN_UST_EXEC_NAME:
2523 case LTTNG_DOMAIN_UST_PID:
2524 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2525 default:
2526 ret = LTTCOMM_NOT_IMPLEMENTED;
2527 goto error;
2528 }
2529
2530 ret = LTTCOMM_OK;
2531
2532 error:
2533 return ret;
2534 }
2535
2536 /*
2537 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2538 *
2539 * TODO: currently, both events and loglevels are kept within the same
2540 * namespace for UST global registry/app registery, so if an event
2541 * happen to have the same name as the loglevel (very unlikely though),
2542 * and an attempt is made to enable/disable both in the same session,
2543 * the first to be created will be the only one allowed to exist.
2544 */
2545 static int cmd_enable_event(struct ltt_session *session, int domain,
2546 char *channel_name, struct lttng_event *event)
2547 {
2548 int ret;
2549 struct lttng_channel *attr;
2550 struct ltt_ust_session *usess = session->ust_session;
2551
2552 switch (domain) {
2553 case LTTNG_DOMAIN_KERNEL:
2554 {
2555 struct ltt_kernel_channel *kchan;
2556
2557 kchan = trace_kernel_get_channel_by_name(channel_name,
2558 session->kernel_session);
2559 if (kchan == NULL) {
2560 attr = channel_new_default_attr(domain);
2561 if (attr == NULL) {
2562 ret = LTTCOMM_FATAL;
2563 goto error;
2564 }
2565 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2566
2567 /* This call will notify the kernel thread */
2568 ret = channel_kernel_create(session->kernel_session,
2569 attr, kernel_poll_pipe[1]);
2570 if (ret != LTTCOMM_OK) {
2571 free(attr);
2572 goto error;
2573 }
2574 free(attr);
2575 }
2576
2577 /* Get the newly created kernel channel pointer */
2578 kchan = trace_kernel_get_channel_by_name(channel_name,
2579 session->kernel_session);
2580 if (kchan == NULL) {
2581 /* This sould not happen... */
2582 ret = LTTCOMM_FATAL;
2583 goto error;
2584 }
2585
2586 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2587 event);
2588 if (ret != LTTCOMM_OK) {
2589 goto error;
2590 }
2591
2592 kernel_wait_quiescent(kernel_tracer_fd);
2593 break;
2594 }
2595 case LTTNG_DOMAIN_UST:
2596 {
2597 struct lttng_channel *attr;
2598 struct ltt_ust_channel *uchan;
2599
2600 /* Get channel from global UST domain */
2601 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2602 channel_name);
2603 if (uchan == NULL) {
2604 /* Create default channel */
2605 attr = channel_new_default_attr(domain);
2606 if (attr == NULL) {
2607 ret = LTTCOMM_FATAL;
2608 goto error;
2609 }
2610 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2611 attr->name[NAME_MAX - 1] = '\0';
2612
2613 ret = channel_ust_create(usess, domain, attr);
2614 if (ret != LTTCOMM_OK) {
2615 free(attr);
2616 goto error;
2617 }
2618 free(attr);
2619
2620 /* Get the newly created channel reference back */
2621 uchan = trace_ust_find_channel_by_name(
2622 usess->domain_global.channels, channel_name);
2623 if (uchan == NULL) {
2624 /* Something is really wrong */
2625 ret = LTTCOMM_FATAL;
2626 goto error;
2627 }
2628 }
2629
2630 /* At this point, the session and channel exist on the tracer */
2631 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2632 if (ret != LTTCOMM_OK) {
2633 goto error;
2634 }
2635 break;
2636 }
2637 case LTTNG_DOMAIN_UST_EXEC_NAME:
2638 case LTTNG_DOMAIN_UST_PID:
2639 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2640 default:
2641 ret = LTTCOMM_NOT_IMPLEMENTED;
2642 goto error;
2643 }
2644
2645 ret = LTTCOMM_OK;
2646
2647 error:
2648 return ret;
2649 }
2650
2651 /*
2652 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2653 */
2654 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2655 char *channel_name, int event_type)
2656 {
2657 int ret;
2658 struct ltt_kernel_channel *kchan;
2659
2660 switch (domain) {
2661 case LTTNG_DOMAIN_KERNEL:
2662 kchan = trace_kernel_get_channel_by_name(channel_name,
2663 session->kernel_session);
2664 if (kchan == NULL) {
2665 /* This call will notify the kernel thread */
2666 ret = channel_kernel_create(session->kernel_session, NULL,
2667 kernel_poll_pipe[1]);
2668 if (ret != LTTCOMM_OK) {
2669 goto error;
2670 }
2671
2672 /* Get the newly created kernel channel pointer */
2673 kchan = trace_kernel_get_channel_by_name(channel_name,
2674 session->kernel_session);
2675 if (kchan == NULL) {
2676 /* This sould not happen... */
2677 ret = LTTCOMM_FATAL;
2678 goto error;
2679 }
2680
2681 }
2682
2683 switch (event_type) {
2684 case LTTNG_EVENT_SYSCALL:
2685 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2686 kchan, kernel_tracer_fd);
2687 break;
2688 case LTTNG_EVENT_TRACEPOINT:
2689 /*
2690 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2691 * events already registered to the channel.
2692 */
2693 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2694 kchan, kernel_tracer_fd);
2695 break;
2696 case LTTNG_EVENT_ALL:
2697 /* Enable syscalls and tracepoints */
2698 ret = event_kernel_enable_all(session->kernel_session,
2699 kchan, kernel_tracer_fd);
2700 break;
2701 default:
2702 ret = LTTCOMM_KERN_ENABLE_FAIL;
2703 goto error;
2704 }
2705
2706 /* Manage return value */
2707 if (ret != LTTCOMM_OK) {
2708 goto error;
2709 }
2710
2711 kernel_wait_quiescent(kernel_tracer_fd);
2712 break;
2713 case LTTNG_DOMAIN_UST:
2714 {
2715 struct lttng_channel *attr;
2716 struct ltt_ust_channel *uchan;
2717 struct ltt_ust_session *usess = session->ust_session;
2718
2719 /* Get channel from global UST domain */
2720 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2721 channel_name);
2722 if (uchan == NULL) {
2723 /* Create default channel */
2724 attr = channel_new_default_attr(domain);
2725 if (attr == NULL) {
2726 ret = LTTCOMM_FATAL;
2727 goto error;
2728 }
2729 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2730 attr->name[NAME_MAX - 1] = '\0';
2731
2732 /* Use the internal command enable channel */
2733 ret = channel_ust_create(usess, domain, attr);
2734 if (ret != LTTCOMM_OK) {
2735 free(attr);
2736 goto error;
2737 }
2738 free(attr);
2739
2740 /* Get the newly created channel reference back */
2741 uchan = trace_ust_find_channel_by_name(
2742 usess->domain_global.channels, channel_name);
2743 if (uchan == NULL) {
2744 /* Something is really wrong */
2745 ret = LTTCOMM_FATAL;
2746 goto error;
2747 }
2748 }
2749
2750 /* At this point, the session and channel exist on the tracer */
2751
2752 switch (event_type) {
2753 case LTTNG_EVENT_ALL:
2754 case LTTNG_EVENT_TRACEPOINT:
2755 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2756 if (ret != LTTCOMM_OK) {
2757 goto error;
2758 }
2759 break;
2760 default:
2761 ret = LTTCOMM_UST_ENABLE_FAIL;
2762 goto error;
2763 }
2764
2765 /* Manage return value */
2766 if (ret != LTTCOMM_OK) {
2767 goto error;
2768 }
2769
2770 break;
2771 }
2772 case LTTNG_DOMAIN_UST_EXEC_NAME:
2773 case LTTNG_DOMAIN_UST_PID:
2774 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2775 default:
2776 ret = LTTCOMM_NOT_IMPLEMENTED;
2777 goto error;
2778 }
2779
2780 ret = LTTCOMM_OK;
2781
2782 error:
2783 return ret;
2784 }
2785
2786 /*
2787 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2788 */
2789 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2790 {
2791 int ret;
2792 ssize_t nb_events = 0;
2793
2794 switch (domain) {
2795 case LTTNG_DOMAIN_KERNEL:
2796 nb_events = kernel_list_events(kernel_tracer_fd, events);
2797 if (nb_events < 0) {
2798 ret = LTTCOMM_KERN_LIST_FAIL;
2799 goto error;
2800 }
2801 break;
2802 case LTTNG_DOMAIN_UST:
2803 nb_events = ust_app_list_events(events);
2804 if (nb_events < 0) {
2805 ret = LTTCOMM_UST_LIST_FAIL;
2806 goto error;
2807 }
2808 break;
2809 default:
2810 ret = LTTCOMM_NOT_IMPLEMENTED;
2811 goto error;
2812 }
2813
2814 return nb_events;
2815
2816 error:
2817 /* Return negative value to differentiate return code */
2818 return -ret;
2819 }
2820
2821 /*
2822 * Command LTTNG_START_TRACE processed by the client thread.
2823 */
2824 static int cmd_start_trace(struct ltt_session *session)
2825 {
2826 int ret;
2827 struct ltt_kernel_session *ksession;
2828 struct ltt_ust_session *usess;
2829
2830 /* Short cut */
2831 ksession = session->kernel_session;
2832 usess = session->ust_session;
2833
2834 if (session->enabled) {
2835 ret = LTTCOMM_UST_START_FAIL;
2836 goto error;
2837 }
2838
2839 session->enabled = 1;
2840
2841 /* Kernel tracing */
2842 if (ksession != NULL) {
2843 struct ltt_kernel_channel *kchan;
2844
2845 /* Open kernel metadata */
2846 if (ksession->metadata == NULL) {
2847 ret = kernel_open_metadata(ksession, ksession->trace_path);
2848 if (ret < 0) {
2849 ret = LTTCOMM_KERN_META_FAIL;
2850 goto error;
2851 }
2852 }
2853
2854 /* Open kernel metadata stream */
2855 if (ksession->metadata_stream_fd == 0) {
2856 ret = kernel_open_metadata_stream(ksession);
2857 if (ret < 0) {
2858 ERR("Kernel create metadata stream failed");
2859 ret = LTTCOMM_KERN_STREAM_FAIL;
2860 goto error;
2861 }
2862 }
2863
2864 /* For each channel */
2865 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2866 if (kchan->stream_count == 0) {
2867 ret = kernel_open_channel_stream(kchan);
2868 if (ret < 0) {
2869 ret = LTTCOMM_KERN_STREAM_FAIL;
2870 goto error;
2871 }
2872 /* Update the stream global counter */
2873 ksession->stream_count_global += ret;
2874 }
2875 }
2876
2877 /* Setup kernel consumer socket and send fds to it */
2878 ret = init_kernel_tracing(ksession);
2879 if (ret < 0) {
2880 ret = LTTCOMM_KERN_START_FAIL;
2881 goto error;
2882 }
2883
2884 /* This start the kernel tracing */
2885 ret = kernel_start_session(ksession);
2886 if (ret < 0) {
2887 ret = LTTCOMM_KERN_START_FAIL;
2888 goto error;
2889 }
2890
2891 /* Quiescent wait after starting trace */
2892 kernel_wait_quiescent(kernel_tracer_fd);
2893 }
2894
2895 /* Flag session that trace should start automatically */
2896 if (usess) {
2897 usess->start_trace = 1;
2898
2899 ret = ust_app_start_trace_all(usess);
2900 if (ret < 0) {
2901 ret = LTTCOMM_UST_START_FAIL;
2902 goto error;
2903 }
2904 }
2905
2906 ret = LTTCOMM_OK;
2907
2908 error:
2909 return ret;
2910 }
2911
2912 /*
2913 * Command LTTNG_STOP_TRACE processed by the client thread.
2914 */
2915 static int cmd_stop_trace(struct ltt_session *session)
2916 {
2917 int ret;
2918 struct ltt_kernel_channel *kchan;
2919 struct ltt_kernel_session *ksession;
2920 struct ltt_ust_session *usess;
2921
2922 /* Short cut */
2923 ksession = session->kernel_session;
2924 usess = session->ust_session;
2925
2926 if (!session->enabled) {
2927 ret = LTTCOMM_UST_STOP_FAIL;
2928 goto error;
2929 }
2930
2931 session->enabled = 0;
2932
2933 /* Kernel tracer */
2934 if (ksession != NULL) {
2935 DBG("Stop kernel tracing");
2936
2937 /* Flush all buffers before stopping */
2938 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2939 if (ret < 0) {
2940 ERR("Kernel metadata flush failed");
2941 }
2942
2943 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2944 ret = kernel_flush_buffer(kchan);
2945 if (ret < 0) {
2946 ERR("Kernel flush buffer error");
2947 }
2948 }
2949
2950 ret = kernel_stop_session(ksession);
2951 if (ret < 0) {
2952 ret = LTTCOMM_KERN_STOP_FAIL;
2953 goto error;
2954 }
2955
2956 kernel_wait_quiescent(kernel_tracer_fd);
2957 }
2958
2959 if (usess) {
2960 usess->start_trace = 0;
2961
2962 ret = ust_app_stop_trace_all(usess);
2963 if (ret < 0) {
2964 ret = LTTCOMM_UST_STOP_FAIL;
2965 goto error;
2966 }
2967 }
2968
2969 ret = LTTCOMM_OK;
2970
2971 error:
2972 return ret;
2973 }
2974
2975 /*
2976 * Command LTTNG_CREATE_SESSION processed by the client thread.
2977 */
2978 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2979 {
2980 int ret;
2981
2982 ret = session_create(name, path, creds->uid, creds->gid);
2983 if (ret != LTTCOMM_OK) {
2984 goto error;
2985 }
2986
2987 ret = LTTCOMM_OK;
2988
2989 error:
2990 return ret;
2991 }
2992
2993 /*
2994 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2995 */
2996 static int cmd_destroy_session(struct ltt_session *session, char *name)
2997 {
2998 int ret;
2999
3000 /* Clean kernel session teardown */
3001 teardown_kernel_session(session);
3002 /* UST session teardown */
3003 teardown_ust_session(session);
3004
3005 /*
3006 * Must notify the kernel thread here to update it's poll setin order
3007 * to remove the channel(s)' fd just destroyed.
3008 */
3009 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3010 if (ret < 0) {
3011 perror("write kernel poll pipe");
3012 }
3013
3014 ret = session_destroy(session);
3015
3016 return ret;
3017 }
3018
3019 /*
3020 * Command LTTNG_CALIBRATE processed by the client thread.
3021 */
3022 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3023 {
3024 int ret;
3025
3026 switch (domain) {
3027 case LTTNG_DOMAIN_KERNEL:
3028 {
3029 struct lttng_kernel_calibrate kcalibrate;
3030
3031 kcalibrate.type = calibrate->type;
3032 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
3033 if (ret < 0) {
3034 ret = LTTCOMM_KERN_ENABLE_FAIL;
3035 goto error;
3036 }
3037 break;
3038 }
3039 default:
3040 /* TODO: Userspace tracing */
3041 ret = LTTCOMM_NOT_IMPLEMENTED;
3042 goto error;
3043 }
3044
3045 ret = LTTCOMM_OK;
3046
3047 error:
3048 return ret;
3049 }
3050
3051 /*
3052 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3053 */
3054 static int cmd_register_consumer(struct ltt_session *session, int domain,
3055 char *sock_path)
3056 {
3057 int ret, sock;
3058
3059 switch (domain) {
3060 case LTTNG_DOMAIN_KERNEL:
3061 /* Can't register a consumer if there is already one */
3062 if (session->kernel_session->consumer_fds_sent != 0) {
3063 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3064 goto error;
3065 }
3066
3067 sock = lttcomm_connect_unix_sock(sock_path);
3068 if (sock < 0) {
3069 ret = LTTCOMM_CONNECT_FAIL;
3070 goto error;
3071 }
3072
3073 session->kernel_session->consumer_fd = sock;
3074 break;
3075 default:
3076 /* TODO: Userspace tracing */
3077 ret = LTTCOMM_NOT_IMPLEMENTED;
3078 goto error;
3079 }
3080
3081 ret = LTTCOMM_OK;
3082
3083 error:
3084 return ret;
3085 }
3086
3087 /*
3088 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3089 */
3090 static ssize_t cmd_list_domains(struct ltt_session *session,
3091 struct lttng_domain **domains)
3092 {
3093 int ret, index = 0;
3094 ssize_t nb_dom = 0;
3095
3096 if (session->kernel_session != NULL) {
3097 DBG3("Listing domains found kernel domain");
3098 nb_dom++;
3099 }
3100
3101 if (session->ust_session != NULL) {
3102 DBG3("Listing domains found UST global domain");
3103 nb_dom++;
3104 }
3105
3106 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3107 if (*domains == NULL) {
3108 ret = -LTTCOMM_FATAL;
3109 goto error;
3110 }
3111
3112 if (session->kernel_session != NULL) {
3113 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3114 index++;
3115 }
3116
3117 if (session->ust_session != NULL) {
3118 (*domains)[index].type = LTTNG_DOMAIN_UST;
3119 index++;
3120 }
3121
3122 return nb_dom;
3123
3124 error:
3125 return ret;
3126 }
3127
3128 /*
3129 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3130 */
3131 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3132 struct lttng_channel **channels)
3133 {
3134 int ret;
3135 ssize_t nb_chan = 0;
3136
3137 switch (domain) {
3138 case LTTNG_DOMAIN_KERNEL:
3139 if (session->kernel_session != NULL) {
3140 nb_chan = session->kernel_session->channel_count;
3141 }
3142 DBG3("Number of kernel channels %zd", nb_chan);
3143 break;
3144 case LTTNG_DOMAIN_UST:
3145 if (session->ust_session != NULL) {
3146 nb_chan = lttng_ht_get_count(
3147 session->ust_session->domain_global.channels);
3148 }
3149 DBG3("Number of UST global channels %zd", nb_chan);
3150 break;
3151 default:
3152 *channels = NULL;
3153 ret = -LTTCOMM_NOT_IMPLEMENTED;
3154 goto error;
3155 }
3156
3157 if (nb_chan > 0) {
3158 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3159 if (*channels == NULL) {
3160 ret = -LTTCOMM_FATAL;
3161 goto error;
3162 }
3163
3164 list_lttng_channels(domain, session, *channels);
3165 } else {
3166 *channels = NULL;
3167 }
3168
3169 return nb_chan;
3170
3171 error:
3172 return ret;
3173 }
3174
3175 /*
3176 * Command LTTNG_LIST_EVENTS processed by the client thread.
3177 */
3178 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3179 char *channel_name, struct lttng_event **events)
3180 {
3181 int ret = 0;
3182 ssize_t nb_event = 0;
3183
3184 switch (domain) {
3185 case LTTNG_DOMAIN_KERNEL:
3186 if (session->kernel_session != NULL) {
3187 nb_event = list_lttng_kernel_events(channel_name,
3188 session->kernel_session, events);
3189 }
3190 break;
3191 case LTTNG_DOMAIN_UST:
3192 {
3193 if (session->ust_session != NULL) {
3194 nb_event = list_lttng_ust_global_events(channel_name,
3195 &session->ust_session->domain_global, events);
3196 }
3197 break;
3198 }
3199 default:
3200 ret = -LTTCOMM_NOT_IMPLEMENTED;
3201 goto error;
3202 }
3203
3204 ret = nb_event;
3205
3206 error:
3207 return ret;
3208 }
3209
3210 /*
3211 * Process the command requested by the lttng client within the command
3212 * context structure. This function make sure that the return structure (llm)
3213 * is set and ready for transmission before returning.
3214 *
3215 * Return any error encountered or 0 for success.
3216 */
3217 static int process_client_msg(struct command_ctx *cmd_ctx)
3218 {
3219 int ret = LTTCOMM_OK;
3220 int need_tracing_session = 1;
3221
3222 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3223
3224 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3225 ret = LTTCOMM_KERN_NA;
3226 goto error;
3227 }
3228
3229 /*
3230 * Check for command that don't needs to allocate a returned payload. We do
3231 * this here so we don't have to make the call for no payload at each
3232 * command.
3233 */
3234 switch(cmd_ctx->lsm->cmd_type) {
3235 case LTTNG_LIST_SESSIONS:
3236 case LTTNG_LIST_TRACEPOINTS:
3237 case LTTNG_LIST_DOMAINS:
3238 case LTTNG_LIST_CHANNELS:
3239 case LTTNG_LIST_EVENTS:
3240 break;
3241 default:
3242 /* Setup lttng message with no payload */
3243 ret = setup_lttng_msg(cmd_ctx, 0);
3244 if (ret < 0) {
3245 /* This label does not try to unlock the session */
3246 goto init_setup_error;
3247 }
3248 }
3249
3250 /* Commands that DO NOT need a session. */
3251 switch (cmd_ctx->lsm->cmd_type) {
3252 case LTTNG_CALIBRATE:
3253 case LTTNG_CREATE_SESSION:
3254 case LTTNG_LIST_SESSIONS:
3255 case LTTNG_LIST_TRACEPOINTS:
3256 need_tracing_session = 0;
3257 break;
3258 default:
3259 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3260 session_lock_list();
3261 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3262 session_unlock_list();
3263 if (cmd_ctx->session == NULL) {
3264 if (cmd_ctx->lsm->session.name != NULL) {
3265 ret = LTTCOMM_SESS_NOT_FOUND;
3266 } else {
3267 /* If no session name specified */
3268 ret = LTTCOMM_SELECT_SESS;
3269 }
3270 goto error;
3271 } else {
3272 /* Acquire lock for the session */
3273 session_lock(cmd_ctx->session);
3274 }
3275 break;
3276 }
3277
3278 /*
3279 * Check domain type for specific "pre-action".
3280 */
3281 switch (cmd_ctx->lsm->domain.type) {
3282 case LTTNG_DOMAIN_KERNEL:
3283 /* Kernel tracer check */
3284 if (kernel_tracer_fd == 0) {
3285 /* Basically, load kernel tracer modules */
3286 init_kernel_tracer();
3287 if (kernel_tracer_fd == 0) {
3288 ret = LTTCOMM_KERN_NA;
3289 goto error;
3290 }
3291 }
3292
3293 /* Need a session for kernel command */
3294 if (need_tracing_session) {
3295 if (cmd_ctx->session->kernel_session == NULL) {
3296 ret = create_kernel_session(cmd_ctx->session);
3297 if (ret < 0) {
3298 ret = LTTCOMM_KERN_SESS_FAIL;
3299 goto error;
3300 }
3301 }
3302
3303 /* Start the kernel consumer daemon */
3304 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3305 if (kconsumer_data.pid == 0 &&
3306 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3307 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3308 ret = start_consumerd(&kconsumer_data);
3309 if (ret < 0) {
3310 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3311 goto error;
3312 }
3313 } else {
3314 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3315 }
3316 }
3317 break;
3318 case LTTNG_DOMAIN_UST:
3319 {
3320 if (need_tracing_session) {
3321 if (cmd_ctx->session->ust_session == NULL) {
3322 ret = create_ust_session(cmd_ctx->session,
3323 &cmd_ctx->lsm->domain);
3324 if (ret != LTTCOMM_OK) {
3325 goto error;
3326 }
3327 }
3328 /* Start the UST consumer daemons */
3329 /* 64-bit */
3330 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3331 if (consumerd64_bin[0] != '\0' &&
3332 ustconsumer64_data.pid == 0 &&
3333 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3334 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3335 ret = start_consumerd(&ustconsumer64_data);
3336 if (ret < 0) {
3337 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3338 ust_consumerd64_fd = -EINVAL;
3339 goto error;
3340 }
3341
3342 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3343 } else {
3344 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3345 }
3346 /* 32-bit */
3347 if (consumerd32_bin[0] != '\0' &&
3348 ustconsumer32_data.pid == 0 &&
3349 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3350 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3351 ret = start_consumerd(&ustconsumer32_data);
3352 if (ret < 0) {
3353 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3354 ust_consumerd32_fd = -EINVAL;
3355 goto error;
3356 }
3357 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3358 } else {
3359 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3360 }
3361 }
3362 break;
3363 }
3364 default:
3365 break;
3366 }
3367
3368 /*
3369 * Check that the UID or GID match that of the tracing session.
3370 * The root user can interact with all sessions.
3371 */
3372 if (need_tracing_session) {
3373 if (!session_access_ok(cmd_ctx->session,
3374 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3375 ret = LTTCOMM_EPERM;
3376 goto error;
3377 }
3378 }
3379
3380 /* Process by command type */
3381 switch (cmd_ctx->lsm->cmd_type) {
3382 case LTTNG_ADD_CONTEXT:
3383 {
3384 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3385 cmd_ctx->lsm->u.context.channel_name,
3386 cmd_ctx->lsm->u.context.event_name,
3387 &cmd_ctx->lsm->u.context.ctx);
3388 break;
3389 }
3390 case LTTNG_DISABLE_CHANNEL:
3391 {
3392 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3393 cmd_ctx->lsm->u.disable.channel_name);
3394 break;
3395 }
3396 case LTTNG_DISABLE_EVENT:
3397 {
3398 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3399 cmd_ctx->lsm->u.disable.channel_name,
3400 cmd_ctx->lsm->u.disable.name);
3401 ret = LTTCOMM_OK;
3402 break;
3403 }
3404 case LTTNG_DISABLE_ALL_EVENT:
3405 {
3406 DBG("Disabling all events");
3407
3408 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3409 cmd_ctx->lsm->u.disable.channel_name);
3410 break;
3411 }
3412 case LTTNG_ENABLE_CHANNEL:
3413 {
3414 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3415 &cmd_ctx->lsm->u.channel.chan);
3416 break;
3417 }
3418 case LTTNG_ENABLE_EVENT:
3419 {
3420 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3421 cmd_ctx->lsm->u.enable.channel_name,
3422 &cmd_ctx->lsm->u.enable.event);
3423 break;
3424 }
3425 case LTTNG_ENABLE_ALL_EVENT:
3426 {
3427 DBG("Enabling all events");
3428
3429 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3430 cmd_ctx->lsm->u.enable.channel_name,
3431 cmd_ctx->lsm->u.enable.event.type);
3432 break;
3433 }
3434 case LTTNG_LIST_TRACEPOINTS:
3435 {
3436 struct lttng_event *events;
3437 ssize_t nb_events;
3438
3439 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3440 if (nb_events < 0) {
3441 ret = -nb_events;
3442 goto error;
3443 }
3444
3445 /*
3446 * Setup lttng message with payload size set to the event list size in
3447 * bytes and then copy list into the llm payload.
3448 */
3449 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3450 if (ret < 0) {
3451 free(events);
3452 goto setup_error;
3453 }
3454
3455 /* Copy event list into message payload */
3456 memcpy(cmd_ctx->llm->payload, events,
3457 sizeof(struct lttng_event) * nb_events);
3458
3459 free(events);
3460
3461 ret = LTTCOMM_OK;
3462 break;
3463 }
3464 case LTTNG_START_TRACE:
3465 {
3466 ret = cmd_start_trace(cmd_ctx->session);
3467 break;
3468 }
3469 case LTTNG_STOP_TRACE:
3470 {
3471 ret = cmd_stop_trace(cmd_ctx->session);
3472 break;
3473 }
3474 case LTTNG_CREATE_SESSION:
3475 {
3476 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3477 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3478 break;
3479 }
3480 case LTTNG_DESTROY_SESSION:
3481 {
3482 ret = cmd_destroy_session(cmd_ctx->session,
3483 cmd_ctx->lsm->session.name);
3484 break;
3485 }
3486 case LTTNG_LIST_DOMAINS:
3487 {
3488 ssize_t nb_dom;
3489 struct lttng_domain *domains;
3490
3491 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3492 if (nb_dom < 0) {
3493 ret = -nb_dom;
3494 goto error;
3495 }
3496
3497 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3498 if (ret < 0) {
3499 goto setup_error;
3500 }
3501
3502 /* Copy event list into message payload */
3503 memcpy(cmd_ctx->llm->payload, domains,
3504 nb_dom * sizeof(struct lttng_domain));
3505
3506 free(domains);
3507
3508 ret = LTTCOMM_OK;
3509 break;
3510 }
3511 case LTTNG_LIST_CHANNELS:
3512 {
3513 size_t nb_chan;
3514 struct lttng_channel *channels;
3515
3516 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3517 cmd_ctx->session, &channels);
3518 if (nb_chan < 0) {
3519 ret = -nb_chan;
3520 goto error;
3521 }
3522
3523 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3524 if (ret < 0) {
3525 goto setup_error;
3526 }
3527
3528 /* Copy event list into message payload */
3529 memcpy(cmd_ctx->llm->payload, channels,
3530 nb_chan * sizeof(struct lttng_channel));
3531
3532 free(channels);
3533
3534 ret = LTTCOMM_OK;
3535 break;
3536 }
3537 case LTTNG_LIST_EVENTS:
3538 {
3539 ssize_t nb_event;
3540 struct lttng_event *events = NULL;
3541
3542 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3543 cmd_ctx->lsm->u.list.channel_name, &events);
3544 if (nb_event < 0) {
3545 ret = -nb_event;
3546 goto error;
3547 }
3548
3549 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3550 if (ret < 0) {
3551 goto setup_error;
3552 }
3553
3554 /* Copy event list into message payload */
3555 memcpy(cmd_ctx->llm->payload, events,
3556 nb_event * sizeof(struct lttng_event));
3557
3558 free(events);
3559
3560 ret = LTTCOMM_OK;
3561 break;
3562 }
3563 case LTTNG_LIST_SESSIONS:
3564 {
3565 unsigned int nr_sessions;
3566
3567 session_lock_list();
3568 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3569 if (nr_sessions == 0) {
3570 ret = LTTCOMM_NO_SESSION;
3571 session_unlock_list();
3572 goto error;
3573 }
3574 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3575 if (ret < 0) {
3576 session_unlock_list();
3577 goto setup_error;
3578 }
3579
3580 /* Filled the session array */
3581 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3582 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3583
3584 session_unlock_list();
3585
3586 ret = LTTCOMM_OK;
3587 break;
3588 }
3589 case LTTNG_CALIBRATE:
3590 {
3591 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3592 &cmd_ctx->lsm->u.calibrate);
3593 break;
3594 }
3595 case LTTNG_REGISTER_CONSUMER:
3596 {
3597 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3598 cmd_ctx->lsm->u.reg.path);
3599 break;
3600 }
3601 default:
3602 ret = LTTCOMM_UND;
3603 break;
3604 }
3605
3606 error:
3607 if (cmd_ctx->llm == NULL) {
3608 DBG("Missing llm structure. Allocating one.");
3609 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3610 goto setup_error;
3611 }
3612 }
3613 /* Set return code */
3614 cmd_ctx->llm->ret_code = ret;
3615 setup_error:
3616 if (cmd_ctx->session) {
3617 session_unlock(cmd_ctx->session);
3618 }
3619 init_setup_error:
3620 return ret;
3621 }
3622
3623 /*
3624 * This thread manage all clients request using the unix client socket for
3625 * communication.
3626 */
3627 static void *thread_manage_clients(void *data)
3628 {
3629 int sock = 0, ret, i, pollfd;
3630 uint32_t revents, nb_fd;
3631 struct command_ctx *cmd_ctx = NULL;
3632 struct lttng_poll_event events;
3633
3634 DBG("[thread] Manage client started");
3635
3636 rcu_register_thread();
3637
3638 ret = lttcomm_listen_unix_sock(client_sock);
3639 if (ret < 0) {
3640 goto error;
3641 }
3642
3643 /*
3644 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3645 * more will be added to this poll set.
3646 */
3647 ret = create_thread_poll_set(&events, 2);
3648 if (ret < 0) {
3649 goto error;
3650 }
3651
3652 /* Add the application registration socket */
3653 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3654 if (ret < 0) {
3655 goto error;
3656 }
3657
3658 /*
3659 * Notify parent pid that we are ready to accept command for client side.
3660 */
3661 if (opt_sig_parent) {
3662 kill(ppid, SIGCHLD);
3663 }
3664
3665 while (1) {
3666 DBG("Accepting client command ...");
3667
3668 nb_fd = LTTNG_POLL_GETNB(&events);
3669
3670 /* Inifinite blocking call, waiting for transmission */
3671 ret = lttng_poll_wait(&events, -1);
3672 if (ret < 0) {
3673 goto error;
3674 }
3675
3676 for (i = 0; i < nb_fd; i++) {
3677 /* Fetch once the poll data */
3678 revents = LTTNG_POLL_GETEV(&events, i);
3679 pollfd = LTTNG_POLL_GETFD(&events, i);
3680
3681 /* Thread quit pipe has been closed. Killing thread. */
3682 ret = check_thread_quit_pipe(pollfd, revents);
3683 if (ret) {
3684 goto error;
3685 }
3686
3687 /* Event on the registration socket */
3688 if (pollfd == client_sock) {
3689 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3690 ERR("Client socket poll error");
3691 goto error;
3692 }
3693 }
3694 }
3695
3696 DBG("Wait for client response");
3697
3698 sock = lttcomm_accept_unix_sock(client_sock);
3699 if (sock < 0) {
3700 goto error;
3701 }
3702
3703 /* Set socket option for credentials retrieval */
3704 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3705 if (ret < 0) {
3706 goto error;
3707 }
3708
3709 /* Allocate context command to process the client request */
3710 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3711 if (cmd_ctx == NULL) {
3712 perror("zmalloc cmd_ctx");
3713 goto error;
3714 }
3715
3716 /* Allocate data buffer for reception */
3717 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3718 if (cmd_ctx->lsm == NULL) {
3719 perror("zmalloc cmd_ctx->lsm");
3720 goto error;
3721 }
3722
3723 cmd_ctx->llm = NULL;
3724 cmd_ctx->session = NULL;
3725
3726 /*
3727 * Data is received from the lttng client. The struct
3728 * lttcomm_session_msg (lsm) contains the command and data request of
3729 * the client.
3730 */
3731 DBG("Receiving data from client ...");
3732 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3733 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3734 if (ret <= 0) {
3735 DBG("Nothing recv() from client... continuing");
3736 close(sock);
3737 free(cmd_ctx);
3738 continue;
3739 }
3740
3741 // TODO: Validate cmd_ctx including sanity check for
3742 // security purpose.
3743
3744 rcu_thread_online();
3745 /*
3746 * This function dispatch the work to the kernel or userspace tracer
3747 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3748 * informations for the client. The command context struct contains
3749 * everything this function may needs.
3750 */
3751 ret = process_client_msg(cmd_ctx);
3752 rcu_thread_offline();
3753 if (ret < 0) {
3754 /*
3755 * TODO: Inform client somehow of the fatal error. At
3756 * this point, ret < 0 means that a zmalloc failed
3757 * (ENOMEM). Error detected but still accept command.
3758 */
3759 clean_command_ctx(&cmd_ctx);
3760 continue;
3761 }
3762
3763 DBG("Sending response (size: %d, retcode: %s)",
3764 cmd_ctx->lttng_msg_size,
3765 lttng_strerror(-cmd_ctx->llm->ret_code));
3766 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3767 if (ret < 0) {
3768 ERR("Failed to send data back to client");
3769 }
3770
3771 /* End of transmission */
3772 close(sock);
3773
3774 clean_command_ctx(&cmd_ctx);
3775 }
3776
3777 error:
3778 DBG("Client thread dying");
3779 unlink(client_unix_sock_path);
3780 close(client_sock);
3781 close(sock);
3782
3783 lttng_poll_clean(&events);
3784 clean_command_ctx(&cmd_ctx);
3785
3786 rcu_unregister_thread();
3787 return NULL;
3788 }
3789
3790
3791 /*
3792 * usage function on stderr
3793 */
3794 static void usage(void)
3795 {
3796 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3797 fprintf(stderr, " -h, --help Display this usage.\n");
3798 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3799 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3800 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3801 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3802 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3803 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3804 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3805 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3806 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3807 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3808 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3809 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3810 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3811 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3812 fprintf(stderr, " -V, --version Show version number.\n");
3813 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3814 fprintf(stderr, " -q, --quiet No output at all.\n");
3815 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3816 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3817 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3818 }
3819
3820 /*
3821 * daemon argument parsing
3822 */
3823 static int parse_args(int argc, char **argv)
3824 {
3825 int c;
3826
3827 static struct option long_options[] = {
3828 { "client-sock", 1, 0, 'c' },
3829 { "apps-sock", 1, 0, 'a' },
3830 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3831 { "kconsumerd-err-sock", 1, 0, 'E' },
3832 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3833 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3834 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3835 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3836 { "consumerd32-path", 1, 0, 'u' },
3837 { "consumerd32-libdir", 1, 0, 'U' },
3838 { "consumerd64-path", 1, 0, 't' },
3839 { "consumerd64-libdir", 1, 0, 'T' },
3840 { "daemonize", 0, 0, 'd' },
3841 { "sig-parent", 0, 0, 'S' },
3842 { "help", 0, 0, 'h' },
3843 { "group", 1, 0, 'g' },
3844 { "version", 0, 0, 'V' },
3845 { "quiet", 0, 0, 'q' },
3846 { "verbose", 0, 0, 'v' },
3847 { "verbose-consumer", 0, 0, 'Z' },
3848 { "no-kernel", 0, 0, 'N' },
3849 { NULL, 0, 0, 0 }
3850 };
3851
3852 while (1) {
3853 int option_index = 0;
3854 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3855 long_options, &option_index);
3856 if (c == -1) {
3857 break;
3858 }
3859
3860 switch (c) {
3861 case 0:
3862 fprintf(stderr, "option %s", long_options[option_index].name);
3863 if (optarg) {
3864 fprintf(stderr, " with arg %s\n", optarg);
3865 }
3866 break;
3867 case 'c':
3868 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3869 break;
3870 case 'a':
3871 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3872 break;
3873 case 'd':
3874 opt_daemon = 1;
3875 break;
3876 case 'g':
3877 opt_tracing_group = optarg;
3878 break;
3879 case 'h':
3880 usage();
3881 exit(EXIT_FAILURE);
3882 case 'V':
3883 fprintf(stdout, "%s\n", VERSION);
3884 exit(EXIT_SUCCESS);
3885 case 'S':
3886 opt_sig_parent = 1;
3887 break;
3888 case 'E':
3889 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3890 break;
3891 case 'C':
3892 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3893 break;
3894 case 'F':
3895 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3896 break;
3897 case 'D':
3898 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3899 break;
3900 case 'H':
3901 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3902 break;
3903 case 'G':
3904 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3905 break;
3906 case 'N':
3907 opt_no_kernel = 1;
3908 break;
3909 case 'q':
3910 opt_quiet = 1;
3911 break;
3912 case 'v':
3913 /* Verbose level can increase using multiple -v */
3914 opt_verbose += 1;
3915 break;
3916 case 'Z':
3917 opt_verbose_consumer += 1;
3918 break;
3919 case 'u':
3920 consumerd32_bin= optarg;
3921 break;
3922 case 'U':
3923 consumerd32_libdir = optarg;
3924 break;
3925 case 't':
3926 consumerd64_bin = optarg;
3927 break;
3928 case 'T':
3929 consumerd64_libdir = optarg;
3930 break;
3931 default:
3932 /* Unknown option or other error.
3933 * Error is printed by getopt, just return */
3934 return -1;
3935 }
3936 }
3937
3938 return 0;
3939 }
3940
3941 /*
3942 * Creates the two needed socket by the daemon.
3943 * apps_sock - The communication socket for all UST apps.
3944 * client_sock - The communication of the cli tool (lttng).
3945 */
3946 static int init_daemon_socket(void)
3947 {
3948 int ret = 0;
3949 mode_t old_umask;
3950
3951 old_umask = umask(0);
3952
3953 /* Create client tool unix socket */
3954 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3955 if (client_sock < 0) {
3956 ERR("Create unix sock failed: %s", client_unix_sock_path);
3957 ret = -1;
3958 goto end;
3959 }
3960
3961 /* File permission MUST be 660 */
3962 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3963 if (ret < 0) {
3964 ERR("Set file permissions failed: %s", client_unix_sock_path);
3965 perror("chmod");
3966 goto end;
3967 }
3968
3969 /* Create the application unix socket */
3970 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3971 if (apps_sock < 0) {
3972 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3973 ret = -1;
3974 goto end;
3975 }
3976
3977 /* File permission MUST be 666 */
3978 ret = chmod(apps_unix_sock_path,
3979 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3980 if (ret < 0) {
3981 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3982 perror("chmod");
3983 goto end;
3984 }
3985
3986 end:
3987 umask(old_umask);
3988 return ret;
3989 }
3990
3991 /*
3992 * Check if the global socket is available, and if a daemon is answering at the
3993 * other side. If yes, error is returned.
3994 */
3995 static int check_existing_daemon(void)
3996 {
3997 if (access(client_unix_sock_path, F_OK) < 0 &&
3998 access(apps_unix_sock_path, F_OK) < 0) {
3999 return 0;
4000 }
4001
4002 /* Is there anybody out there ? */
4003 if (lttng_session_daemon_alive()) {
4004 return -EEXIST;
4005 } else {
4006 return 0;
4007 }
4008 }
4009
4010 /*
4011 * Set the tracing group gid onto the client socket.
4012 *
4013 * Race window between mkdir and chown is OK because we are going from more
4014 * permissive (root.root) to les permissive (root.tracing).
4015 */
4016 static int set_permissions(char *rundir)
4017 {
4018 int ret;
4019 gid_t gid;
4020
4021 gid = allowed_group();
4022 if (gid < 0) {
4023 WARN("No tracing group detected");
4024 ret = 0;
4025 goto end;
4026 }
4027
4028 /* Set lttng run dir */
4029 ret = chown(rundir, 0, gid);
4030 if (ret < 0) {
4031 ERR("Unable to set group on %s", rundir);
4032 perror("chown");
4033 }
4034
4035 /* lttng client socket path */
4036 ret = chown(client_unix_sock_path, 0, gid);
4037 if (ret < 0) {
4038 ERR("Unable to set group on %s", client_unix_sock_path);
4039 perror("chown");
4040 }
4041
4042 /* kconsumer error socket path */
4043 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4044 if (ret < 0) {
4045 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4046 perror("chown");
4047 }
4048
4049 /* 64-bit ustconsumer error socket path */
4050 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4051 if (ret < 0) {
4052 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4053 perror("chown");
4054 }
4055
4056 /* 32-bit ustconsumer compat32 error socket path */
4057 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4058 if (ret < 0) {
4059 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4060 perror("chown");
4061 }
4062
4063 DBG("All permissions are set");
4064
4065 end:
4066 return ret;
4067 }
4068
4069 /*
4070 * Create the pipe used to wake up the kernel thread.
4071 */
4072 static int create_kernel_poll_pipe(void)
4073 {
4074 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4075 }
4076
4077 /*
4078 * Create the application command pipe to wake thread_manage_apps.
4079 */
4080 static int create_apps_cmd_pipe(void)
4081 {
4082 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4083 }
4084
4085 /*
4086 * Create the lttng run directory needed for all global sockets and pipe.
4087 */
4088 static int create_lttng_rundir(const char *rundir)
4089 {
4090 int ret;
4091
4092 DBG3("Creating LTTng run directory: %s", rundir);
4093
4094 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4095 if (ret < 0) {
4096 if (errno != EEXIST) {
4097 ERR("Unable to create %s", rundir);
4098 goto error;
4099 } else {
4100 ret = 0;
4101 }
4102 }
4103
4104 error:
4105 return ret;
4106 }
4107
4108 /*
4109 * Setup sockets and directory needed by the kconsumerd communication with the
4110 * session daemon.
4111 */
4112 static int set_consumer_sockets(struct consumer_data *consumer_data,
4113 const char *rundir)
4114 {
4115 int ret;
4116 char path[PATH_MAX];
4117
4118 switch (consumer_data->type) {
4119 case LTTNG_CONSUMER_KERNEL:
4120 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
4121 break;
4122 case LTTNG_CONSUMER64_UST:
4123 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
4124 break;
4125 case LTTNG_CONSUMER32_UST:
4126 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
4127 break;
4128 default:
4129 ERR("Consumer type unknown");
4130 ret = -EINVAL;
4131 goto error;
4132 }
4133
4134 DBG2("Creating consumer directory: %s", path);
4135
4136 ret = mkdir(path, S_IRWXU | S_IRWXG);
4137 if (ret < 0) {
4138 if (errno != EEXIST) {
4139 ERR("Failed to create %s", path);
4140 goto error;
4141 }
4142 ret = 0;
4143 }
4144
4145 /* Create the kconsumerd error unix socket */
4146 consumer_data->err_sock =
4147 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4148 if (consumer_data->err_sock < 0) {
4149 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4150 ret = -1;
4151 goto error;
4152 }
4153
4154 /* File permission MUST be 660 */
4155 ret = chmod(consumer_data->err_unix_sock_path,
4156 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4157 if (ret < 0) {
4158 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4159 PERROR("chmod");
4160 goto error;
4161 }
4162
4163 error:
4164 return ret;
4165 }
4166
4167 /*
4168 * Signal handler for the daemon
4169 *
4170 * Simply stop all worker threads, leaving main() return gracefully after
4171 * joining all threads and calling cleanup().
4172 */
4173 static void sighandler(int sig)
4174 {
4175 switch (sig) {
4176 case SIGPIPE:
4177 DBG("SIGPIPE catched");
4178 return;
4179 case SIGINT:
4180 DBG("SIGINT catched");
4181 stop_threads();
4182 break;
4183 case SIGTERM:
4184 DBG("SIGTERM catched");
4185 stop_threads();
4186 break;
4187 default:
4188 break;
4189 }
4190 }
4191
4192 /*
4193 * Setup signal handler for :
4194 * SIGINT, SIGTERM, SIGPIPE
4195 */
4196 static int set_signal_handler(void)
4197 {
4198 int ret = 0;
4199 struct sigaction sa;
4200 sigset_t sigset;
4201
4202 if ((ret = sigemptyset(&sigset)) < 0) {
4203 perror("sigemptyset");
4204 return ret;
4205 }
4206
4207 sa.sa_handler = sighandler;
4208 sa.sa_mask = sigset;
4209 sa.sa_flags = 0;
4210 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4211 perror("sigaction");
4212 return ret;
4213 }
4214
4215 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4216 perror("sigaction");
4217 return ret;
4218 }
4219
4220 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4221 perror("sigaction");
4222 return ret;
4223 }
4224
4225 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4226
4227 return ret;
4228 }
4229
4230 /*
4231 * Set open files limit to unlimited. This daemon can open a large number of
4232 * file descriptors in order to consumer multiple kernel traces.
4233 */
4234 static void set_ulimit(void)
4235 {
4236 int ret;
4237 struct rlimit lim;
4238
4239 /* The kernel does not allowed an infinite limit for open files */
4240 lim.rlim_cur = 65535;
4241 lim.rlim_max = 65535;
4242
4243 ret = setrlimit(RLIMIT_NOFILE, &lim);
4244 if (ret < 0) {
4245 perror("failed to set open files limit");
4246 }
4247 }
4248
4249 /*
4250 * main
4251 */
4252 int main(int argc, char **argv)
4253 {
4254 int ret = 0;
4255 void *status;
4256 const char *home_path;
4257
4258 rcu_register_thread();
4259
4260 /* Create thread quit pipe */
4261 if ((ret = init_thread_quit_pipe()) < 0) {
4262 goto error;
4263 }
4264
4265 setup_consumerd_path();
4266
4267 /* Parse arguments */
4268 progname = argv[0];
4269 if ((ret = parse_args(argc, argv) < 0)) {
4270 goto error;
4271 }
4272
4273 /* Daemonize */
4274 if (opt_daemon) {
4275 ret = daemon(0, 0);
4276 if (ret < 0) {
4277 perror("daemon");
4278 goto error;
4279 }
4280 }
4281
4282 /* Check if daemon is UID = 0 */
4283 is_root = !getuid();
4284
4285 if (is_root) {
4286 rundir = strdup(LTTNG_RUNDIR);
4287
4288 /* Create global run dir with root access */
4289 ret = create_lttng_rundir(rundir);
4290 if (ret < 0) {
4291 goto error;
4292 }
4293
4294 if (strlen(apps_unix_sock_path) == 0) {
4295 snprintf(apps_unix_sock_path, PATH_MAX,
4296 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4297 }
4298
4299 if (strlen(client_unix_sock_path) == 0) {
4300 snprintf(client_unix_sock_path, PATH_MAX,
4301 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4302 }
4303
4304 /* Set global SHM for ust */
4305 if (strlen(wait_shm_path) == 0) {
4306 snprintf(wait_shm_path, PATH_MAX,
4307 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4308 }
4309
4310 /* Setup kernel consumerd path */
4311 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4312 KCONSUMERD_ERR_SOCK_PATH, rundir);
4313 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4314 KCONSUMERD_CMD_SOCK_PATH, rundir);
4315
4316 DBG2("Kernel consumer err path: %s",
4317 kconsumer_data.err_unix_sock_path);
4318 DBG2("Kernel consumer cmd path: %s",
4319 kconsumer_data.cmd_unix_sock_path);
4320 } else {
4321 home_path = get_home_dir();
4322 if (home_path == NULL) {
4323 /* TODO: Add --socket PATH option */
4324 ERR("Can't get HOME directory for sockets creation.");
4325 ret = -EPERM;
4326 goto error;
4327 }
4328
4329 /*
4330 * Create rundir from home path. This will create something like
4331 * $HOME/.lttng
4332 */
4333 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4334 if (ret < 0) {
4335 ret = -ENOMEM;
4336 goto error;
4337 }
4338
4339 ret = create_lttng_rundir(rundir);
4340 if (ret < 0) {
4341 goto error;
4342 }
4343
4344 if (strlen(apps_unix_sock_path) == 0) {
4345 snprintf(apps_unix_sock_path, PATH_MAX,
4346 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4347 }
4348
4349 /* Set the cli tool unix socket path */
4350 if (strlen(client_unix_sock_path) == 0) {
4351 snprintf(client_unix_sock_path, PATH_MAX,
4352 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4353 }
4354
4355 /* Set global SHM for ust */
4356 if (strlen(wait_shm_path) == 0) {
4357 snprintf(wait_shm_path, PATH_MAX,
4358 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4359 }
4360 }
4361
4362 DBG("Client socket path %s", client_unix_sock_path);
4363 DBG("Application socket path %s", apps_unix_sock_path);
4364 DBG("LTTng run directory path: %s", rundir);
4365
4366 /* 32 bits consumerd path setup */
4367 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4368 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4369 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4370 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4371
4372 DBG2("UST consumer 32 bits err path: %s",
4373 ustconsumer32_data.err_unix_sock_path);
4374 DBG2("UST consumer 32 bits cmd path: %s",
4375 ustconsumer32_data.cmd_unix_sock_path);
4376
4377 /* 64 bits consumerd path setup */
4378 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4379 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4380 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4381 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4382
4383 DBG2("UST consumer 64 bits err path: %s",
4384 ustconsumer64_data.err_unix_sock_path);
4385 DBG2("UST consumer 64 bits cmd path: %s",
4386 ustconsumer64_data.cmd_unix_sock_path);
4387
4388 /*
4389 * See if daemon already exist.
4390 */
4391 if ((ret = check_existing_daemon()) < 0) {
4392 ERR("Already running daemon.\n");
4393 /*
4394 * We do not goto exit because we must not cleanup()
4395 * because a daemon is already running.
4396 */
4397 goto error;
4398 }
4399
4400 /* After this point, we can safely call cleanup() with "goto exit" */
4401
4402 /*
4403 * These actions must be executed as root. We do that *after* setting up
4404 * the sockets path because we MUST make the check for another daemon using
4405 * those paths *before* trying to set the kernel consumer sockets and init
4406 * kernel tracer.
4407 */
4408 if (is_root) {
4409 ret = set_consumer_sockets(&kconsumer_data, rundir);
4410 if (ret < 0) {
4411 goto exit;
4412 }
4413
4414 /* Setup kernel tracer */
4415 if (!opt_no_kernel) {
4416 init_kernel_tracer();
4417 }
4418
4419 /* Set ulimit for open files */
4420 set_ulimit();
4421 }
4422
4423 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4424 if (ret < 0) {
4425 goto exit;
4426 }
4427
4428 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4429 if (ret < 0) {
4430 goto exit;
4431 }
4432
4433 if ((ret = set_signal_handler()) < 0) {
4434 goto exit;
4435 }
4436
4437 /* Setup the needed unix socket */
4438 if ((ret = init_daemon_socket()) < 0) {
4439 goto exit;
4440 }
4441
4442 /* Set credentials to socket */
4443 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4444 goto exit;
4445 }
4446
4447 /* Get parent pid if -S, --sig-parent is specified. */
4448 if (opt_sig_parent) {
4449 ppid = getppid();
4450 }
4451
4452 /* Setup the kernel pipe for waking up the kernel thread */
4453 if ((ret = create_kernel_poll_pipe()) < 0) {
4454 goto exit;
4455 }
4456
4457 /* Setup the thread apps communication pipe. */
4458 if ((ret = create_apps_cmd_pipe()) < 0) {
4459 goto exit;
4460 }
4461
4462 /* Init UST command queue. */
4463 cds_wfq_init(&ust_cmd_queue.queue);
4464
4465 /* Init UST app hash table */
4466 ust_app_ht_alloc();
4467
4468 /*
4469 * Get session list pointer. This pointer MUST NOT be free(). This list is
4470 * statically declared in session.c
4471 */
4472 session_list_ptr = session_get_list();
4473
4474 /* Set up max poll set size */
4475 lttng_poll_set_max_size();
4476
4477 /* Create thread to manage the client socket */
4478 ret = pthread_create(&client_thread, NULL,
4479 thread_manage_clients, (void *) NULL);
4480 if (ret != 0) {
4481 perror("pthread_create clients");
4482 goto exit_client;
4483 }
4484
4485 /* Create thread to dispatch registration */
4486 ret = pthread_create(&dispatch_thread, NULL,
4487 thread_dispatch_ust_registration, (void *) NULL);
4488 if (ret != 0) {
4489 perror("pthread_create dispatch");
4490 goto exit_dispatch;
4491 }
4492
4493 /* Create thread to manage application registration. */
4494 ret = pthread_create(&reg_apps_thread, NULL,
4495 thread_registration_apps, (void *) NULL);
4496 if (ret != 0) {
4497 perror("pthread_create registration");
4498 goto exit_reg_apps;
4499 }
4500
4501 /* Create thread to manage application socket */
4502 ret = pthread_create(&apps_thread, NULL,
4503 thread_manage_apps, (void *) NULL);
4504 if (ret != 0) {
4505 perror("pthread_create apps");
4506 goto exit_apps;
4507 }
4508
4509 /* Create kernel thread to manage kernel event */
4510 ret = pthread_create(&kernel_thread, NULL,
4511 thread_manage_kernel, (void *) NULL);
4512 if (ret != 0) {
4513 perror("pthread_create kernel");
4514 goto exit_kernel;
4515 }
4516
4517 ret = pthread_join(kernel_thread, &status);
4518 if (ret != 0) {
4519 perror("pthread_join");
4520 goto error; /* join error, exit without cleanup */
4521 }
4522
4523 exit_kernel:
4524 ret = pthread_join(apps_thread, &status);
4525 if (ret != 0) {
4526 perror("pthread_join");
4527 goto error; /* join error, exit without cleanup */
4528 }
4529
4530 exit_apps:
4531 ret = pthread_join(reg_apps_thread, &status);
4532 if (ret != 0) {
4533 perror("pthread_join");
4534 goto error; /* join error, exit without cleanup */
4535 }
4536
4537 exit_reg_apps:
4538 ret = pthread_join(dispatch_thread, &status);
4539 if (ret != 0) {
4540 perror("pthread_join");
4541 goto error; /* join error, exit without cleanup */
4542 }
4543
4544 exit_dispatch:
4545 ret = pthread_join(client_thread, &status);
4546 if (ret != 0) {
4547 perror("pthread_join");
4548 goto error; /* join error, exit without cleanup */
4549 }
4550
4551 ret = join_consumer_thread(&kconsumer_data);
4552 if (ret != 0) {
4553 perror("join_consumer");
4554 goto error; /* join error, exit without cleanup */
4555 }
4556
4557 exit_client:
4558 exit:
4559 /*
4560 * cleanup() is called when no other thread is running.
4561 */
4562 rcu_thread_online();
4563 cleanup();
4564 rcu_thread_offline();
4565 rcu_unregister_thread();
4566 if (!ret) {
4567 exit(EXIT_SUCCESS);
4568 }
4569 error:
4570 exit(EXIT_FAILURE);
4571 }
LTTng 2.0 tools and control repository
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