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Fix: meaningful error message
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 /* Const values */
79 const char default_home_dir[] = DEFAULT_HOME_DIR;
80 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
81 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
84 /* Variables */
85 int opt_verbose; /* Not static for lttngerr.h */
86 int opt_verbose_consumer; /* Not static for lttngerr.h */
87 int opt_quiet; /* Not static for lttngerr.h */
88
89 const char *progname;
90 const char *opt_tracing_group;
91 static int opt_sig_parent;
92 static int opt_daemon;
93 static int opt_no_kernel;
94 static int is_root; /* Set to 1 if the daemon is running as root */
95 static pid_t ppid; /* Parent PID for --sig-parent option */
96 static char *rundir;
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
103 .err_sock = -1,
104 .cmd_sock = -1,
105 };
106 static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
108 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
110 .err_sock = -1,
111 .cmd_sock = -1,
112 };
113 static struct consumer_data ustconsumer32_data = {
114 .type = LTTNG_CONSUMER32_UST,
115 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
116 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
117 .err_sock = -1,
118 .cmd_sock = -1,
119 };
120
121 static int dispatch_thread_exit;
122
123 /* Global application Unix socket path */
124 static char apps_unix_sock_path[PATH_MAX];
125 /* Global client Unix socket path */
126 static char client_unix_sock_path[PATH_MAX];
127 /* global wait shm path for UST */
128 static char wait_shm_path[PATH_MAX];
129
130 /* Sockets and FDs */
131 static int client_sock = -1;
132 static int apps_sock = -1;
133 static int kernel_tracer_fd = -1;
134 static int kernel_poll_pipe[2] = { -1, -1 };
135
136 /*
137 * Quit pipe for all threads. This permits a single cancellation point
138 * for all threads when receiving an event on the pipe.
139 */
140 static int thread_quit_pipe[2] = { -1, -1 };
141
142 /*
143 * This pipe is used to inform the thread managing application communication
144 * that a command is queued and ready to be processed.
145 */
146 static int apps_cmd_pipe[2] = { -1, -1 };
147
148 /* Pthread, Mutexes and Semaphores */
149 static pthread_t apps_thread;
150 static pthread_t reg_apps_thread;
151 static pthread_t client_thread;
152 static pthread_t kernel_thread;
153 static pthread_t dispatch_thread;
154
155
156 /*
157 * UST registration command queue. This queue is tied with a futex and uses a N
158 * wakers / 1 waiter implemented and detailed in futex.c/.h
159 *
160 * The thread_manage_apps and thread_dispatch_ust_registration interact with
161 * this queue and the wait/wake scheme.
162 */
163 static struct ust_cmd_queue ust_cmd_queue;
164
165 /*
166 * Pointer initialized before thread creation.
167 *
168 * This points to the tracing session list containing the session count and a
169 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
170 * MUST NOT be taken if you call a public function in session.c.
171 *
172 * The lock is nested inside the structure: session_list_ptr->lock. Please use
173 * session_lock_list and session_unlock_list for lock acquisition.
174 */
175 static struct ltt_session_list *session_list_ptr;
176
177 int ust_consumerd64_fd = -1;
178 int ust_consumerd32_fd = -1;
179
180 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
181 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
182 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
183 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
184
185 static
186 void setup_consumerd_path(void)
187 {
188 const char *bin, *libdir;
189
190 /*
191 * Allow INSTALL_BIN_PATH to be used as a target path for the
192 * native architecture size consumer if CONFIG_CONSUMER*_PATH
193 * has not been defined.
194 */
195 #if (CAA_BITS_PER_LONG == 32)
196 if (!consumerd32_bin[0]) {
197 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
198 }
199 if (!consumerd32_libdir[0]) {
200 consumerd32_libdir = INSTALL_LIB_PATH;
201 }
202 #elif (CAA_BITS_PER_LONG == 64)
203 if (!consumerd64_bin[0]) {
204 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
205 }
206 if (!consumerd64_libdir[0]) {
207 consumerd64_libdir = INSTALL_LIB_PATH;
208 }
209 #else
210 #error "Unknown bitness"
211 #endif
212
213 /*
214 * runtime env. var. overrides the build default.
215 */
216 bin = getenv("LTTNG_CONSUMERD32_BIN");
217 if (bin) {
218 consumerd32_bin = bin;
219 }
220 bin = getenv("LTTNG_CONSUMERD64_BIN");
221 if (bin) {
222 consumerd64_bin = bin;
223 }
224 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
225 if (libdir) {
226 consumerd32_libdir = libdir;
227 }
228 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
229 if (libdir) {
230 consumerd64_libdir = libdir;
231 }
232 }
233
234 /*
235 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 */
237 static int create_thread_poll_set(struct lttng_poll_event *events,
238 unsigned int size)
239 {
240 int ret;
241
242 if (events == NULL || size == 0) {
243 ret = -1;
244 goto error;
245 }
246
247 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
248 if (ret < 0) {
249 goto error;
250 }
251
252 /* Add quit pipe */
253 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
254 if (ret < 0) {
255 goto error;
256 }
257
258 return 0;
259
260 error:
261 return ret;
262 }
263
264 /*
265 * Check if the thread quit pipe was triggered.
266 *
267 * Return 1 if it was triggered else 0;
268 */
269 static int check_thread_quit_pipe(int fd, uint32_t events)
270 {
271 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
272 return 1;
273 }
274
275 return 0;
276 }
277
278 /*
279 * Return group ID of the tracing group or -1 if not found.
280 */
281 static gid_t allowed_group(void)
282 {
283 struct group *grp;
284
285 if (opt_tracing_group) {
286 grp = getgrnam(opt_tracing_group);
287 } else {
288 grp = getgrnam(default_tracing_group);
289 }
290 if (!grp) {
291 return -1;
292 } else {
293 return grp->gr_gid;
294 }
295 }
296
297 /*
298 * Init thread quit pipe.
299 *
300 * Return -1 on error or 0 if all pipes are created.
301 */
302 static int init_thread_quit_pipe(void)
303 {
304 int ret;
305
306 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
307 if (ret < 0) {
308 PERROR("thread quit pipe");
309 goto error;
310 }
311
312 error:
313 return ret;
314 }
315
316 /*
317 * Complete teardown of a kernel session. This free all data structure related
318 * to a kernel session and update counter.
319 */
320 static void teardown_kernel_session(struct ltt_session *session)
321 {
322 if (!session->kernel_session) {
323 DBG3("No kernel session when tearing down session");
324 return;
325 }
326
327 DBG("Tearing down kernel session");
328
329 /*
330 * If a custom kernel consumer was registered, close the socket before
331 * tearing down the complete kernel session structure
332 */
333 if (kconsumer_data.cmd_sock >= 0 &&
334 session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
335 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
336 }
337
338 trace_kernel_destroy_session(session->kernel_session);
339 }
340
341 /*
342 * Complete teardown of all UST sessions. This will free everything on his path
343 * and destroy the core essence of all ust sessions :)
344 */
345 static void teardown_ust_session(struct ltt_session *session)
346 {
347 int ret;
348
349 if (!session->ust_session) {
350 DBG3("No UST session when tearing down session");
351 return;
352 }
353
354 DBG("Tearing down UST session(s)");
355
356 ret = ust_app_destroy_trace_all(session->ust_session);
357 if (ret) {
358 ERR("Error in ust_app_destroy_trace_all");
359 }
360
361 trace_ust_destroy_session(session->ust_session);
362 }
363
364 /*
365 * Stop all threads by closing the thread quit pipe.
366 */
367 static void stop_threads(void)
368 {
369 int ret;
370
371 /* Stopping all threads */
372 DBG("Terminating all threads");
373 ret = notify_thread_pipe(thread_quit_pipe[1]);
374 if (ret < 0) {
375 ERR("write error on thread quit pipe");
376 }
377
378 /* Dispatch thread */
379 dispatch_thread_exit = 1;
380 futex_nto1_wake(&ust_cmd_queue.futex);
381 }
382
383 /*
384 * Cleanup the daemon
385 */
386 static void cleanup(void)
387 {
388 int ret, i;
389 char *cmd;
390 struct ltt_session *sess, *stmp;
391
392 DBG("Cleaning up");
393
394 DBG("Removing %s directory", rundir);
395 ret = asprintf(&cmd, "rm -rf %s", rundir);
396 if (ret < 0) {
397 ERR("asprintf failed. Something is really wrong!");
398 }
399
400 /* Remove lttng run directory */
401 ret = system(cmd);
402 if (ret < 0) {
403 ERR("Unable to clean %s", rundir);
404 }
405 free(cmd);
406
407 DBG("Cleaning up all sessions");
408
409 /* Destroy session list mutex */
410 if (session_list_ptr != NULL) {
411 pthread_mutex_destroy(&session_list_ptr->lock);
412
413 /* Cleanup ALL session */
414 cds_list_for_each_entry_safe(sess, stmp,
415 &session_list_ptr->head, list) {
416 teardown_kernel_session(sess);
417 teardown_ust_session(sess);
418 free(sess);
419 }
420 }
421
422 DBG("Closing all UST sockets");
423 ust_app_clean_list();
424
425 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
426
427 if (is_root && !opt_no_kernel) {
428 DBG2("Closing kernel fd");
429 if (kernel_tracer_fd >= 0) {
430 ret = close(kernel_tracer_fd);
431 if (ret) {
432 PERROR("close");
433 }
434 }
435 DBG("Unloading kernel modules");
436 modprobe_remove_lttng_all();
437 }
438
439 /*
440 * Closing all pipes used for communication between threads.
441 */
442 for (i = 0; i < 2; i++) {
443 if (kernel_poll_pipe[i] >= 0) {
444 ret = close(kernel_poll_pipe[i]);
445 if (ret) {
446 PERROR("close");
447 }
448
449 }
450 }
451 for (i = 0; i < 2; i++) {
452 if (thread_quit_pipe[i] >= 0) {
453 ret = close(thread_quit_pipe[i]);
454 if (ret) {
455 PERROR("close");
456 }
457 }
458 }
459 for (i = 0; i < 2; i++) {
460 if (apps_cmd_pipe[i] >= 0) {
461 ret = close(apps_cmd_pipe[i]);
462 if (ret) {
463 PERROR("close");
464 }
465 }
466 }
467
468 /* <fun> */
469 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
470 "Matthew, BEET driven development works!%c[%dm",
471 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
472 /* </fun> */
473 }
474
475 /*
476 * Send data on a unix socket using the liblttsessiondcomm API.
477 *
478 * Return lttcomm error code.
479 */
480 static int send_unix_sock(int sock, void *buf, size_t len)
481 {
482 /* Check valid length */
483 if (len <= 0) {
484 return -1;
485 }
486
487 return lttcomm_send_unix_sock(sock, buf, len);
488 }
489
490 /*
491 * Free memory of a command context structure.
492 */
493 static void clean_command_ctx(struct command_ctx **cmd_ctx)
494 {
495 DBG("Clean command context structure");
496 if (*cmd_ctx) {
497 if ((*cmd_ctx)->llm) {
498 free((*cmd_ctx)->llm);
499 }
500 if ((*cmd_ctx)->lsm) {
501 free((*cmd_ctx)->lsm);
502 }
503 free(*cmd_ctx);
504 *cmd_ctx = NULL;
505 }
506 }
507
508 /*
509 * Send all stream fds of kernel channel to the consumer.
510 */
511 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
512 int sock, struct ltt_kernel_channel *channel,
513 uid_t uid, gid_t gid)
514 {
515 int ret;
516 struct ltt_kernel_stream *stream;
517 struct lttcomm_consumer_msg lkm;
518
519 DBG("Sending streams of channel %s to kernel consumer",
520 channel->channel->name);
521
522 /* Send channel */
523 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
524 lkm.u.channel.channel_key = channel->fd;
525 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
526 lkm.u.channel.mmap_len = 0; /* for kernel */
527 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
528 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
529 if (ret < 0) {
530 PERROR("send consumer channel");
531 goto error;
532 }
533
534 /* Send streams */
535 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
536 if (!stream->fd) {
537 continue;
538 }
539 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
540 lkm.u.stream.channel_key = channel->fd;
541 lkm.u.stream.stream_key = stream->fd;
542 lkm.u.stream.state = stream->state;
543 lkm.u.stream.output = channel->channel->attr.output;
544 lkm.u.stream.mmap_len = 0; /* for kernel */
545 lkm.u.stream.uid = uid;
546 lkm.u.stream.gid = gid;
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 PERROR("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 PERROR("send consumer stream ancillary data");
558 goto error;
559 }
560 }
561
562 DBG("consumer channel streams sent");
563
564 return 0;
565
566 error:
567 return ret;
568 }
569
570 /*
571 * Send all stream fds of the kernel session to the consumer.
572 */
573 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
574 struct ltt_kernel_session *session)
575 {
576 int ret;
577 struct ltt_kernel_channel *chan;
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
580
581 DBG("Sending metadata stream fd");
582
583 /* Extra protection. It's NOT supposed to be set to -1 at this point */
584 if (session->consumer_fd < 0) {
585 session->consumer_fd = consumer_data->cmd_sock;
586 }
587
588 if (session->metadata_stream_fd >= 0) {
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 PERROR("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 lkm.u.stream.uid = session->uid;
609 lkm.u.stream.gid = session->gid;
610 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
611 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
612 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
613 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
614 if (ret < 0) {
615 PERROR("send consumer stream");
616 goto error;
617 }
618 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
619 if (ret < 0) {
620 PERROR("send consumer stream");
621 goto error;
622 }
623 }
624
625 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
626 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
627 session->uid, session->gid);
628 if (ret < 0) {
629 goto error;
630 }
631 }
632
633 DBG("consumer fds (metadata and channel streams) sent");
634
635 return 0;
636
637 error:
638 return ret;
639 }
640
641 /*
642 * Notify UST applications using the shm mmap futex.
643 */
644 static int notify_ust_apps(int active)
645 {
646 char *wait_shm_mmap;
647
648 DBG("Notifying applications of session daemon state: %d", active);
649
650 /* See shm.c for this call implying mmap, shm and futex calls */
651 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
652 if (wait_shm_mmap == NULL) {
653 goto error;
654 }
655
656 /* Wake waiting process */
657 futex_wait_update((int32_t *) wait_shm_mmap, active);
658
659 /* Apps notified successfully */
660 return 0;
661
662 error:
663 return -1;
664 }
665
666 /*
667 * Setup the outgoing data buffer for the response (llm) by allocating the
668 * right amount of memory and copying the original information from the lsm
669 * structure.
670 *
671 * Return total size of the buffer pointed by buf.
672 */
673 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
674 {
675 int ret, buf_size;
676
677 buf_size = size;
678
679 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
680 if (cmd_ctx->llm == NULL) {
681 PERROR("zmalloc");
682 ret = -ENOMEM;
683 goto error;
684 }
685
686 /* Copy common data */
687 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
688 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
689
690 cmd_ctx->llm->data_size = size;
691 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
692
693 return buf_size;
694
695 error:
696 return ret;
697 }
698
699 /*
700 * Update the kernel poll set of all channel fd available over all tracing
701 * session. Add the wakeup pipe at the end of the set.
702 */
703 static int update_kernel_poll(struct lttng_poll_event *events)
704 {
705 int ret;
706 struct ltt_session *session;
707 struct ltt_kernel_channel *channel;
708
709 DBG("Updating kernel poll set");
710
711 session_lock_list();
712 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
713 session_lock(session);
714 if (session->kernel_session == NULL) {
715 session_unlock(session);
716 continue;
717 }
718
719 cds_list_for_each_entry(channel,
720 &session->kernel_session->channel_list.head, list) {
721 /* Add channel fd to the kernel poll set */
722 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
723 if (ret < 0) {
724 session_unlock(session);
725 goto error;
726 }
727 DBG("Channel fd %d added to kernel set", channel->fd);
728 }
729 session_unlock(session);
730 }
731 session_unlock_list();
732
733 return 0;
734
735 error:
736 session_unlock_list();
737 return -1;
738 }
739
740 /*
741 * Find the channel fd from 'fd' over all tracing session. When found, check
742 * for new channel stream and send those stream fds to the kernel consumer.
743 *
744 * Useful for CPU hotplug feature.
745 */
746 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
747 {
748 int ret = 0;
749 struct ltt_session *session;
750 struct ltt_kernel_channel *channel;
751
752 DBG("Updating kernel streams for channel fd %d", fd);
753
754 session_lock_list();
755 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
756 session_lock(session);
757 if (session->kernel_session == NULL) {
758 session_unlock(session);
759 continue;
760 }
761
762 /* This is not suppose to be -1 but this is an extra security check */
763 if (session->kernel_session->consumer_fd < 0) {
764 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
765 }
766
767 cds_list_for_each_entry(channel,
768 &session->kernel_session->channel_list.head, list) {
769 if (channel->fd == fd) {
770 DBG("Channel found, updating kernel streams");
771 ret = kernel_open_channel_stream(channel);
772 if (ret < 0) {
773 goto error;
774 }
775
776 /*
777 * Have we already sent fds to the consumer? If yes, it means
778 * that tracing is started so it is safe to send our updated
779 * stream fds.
780 */
781 if (session->kernel_session->consumer_fds_sent == 1) {
782 ret = send_kconsumer_channel_streams(consumer_data,
783 session->kernel_session->consumer_fd, channel,
784 session->uid, session->gid);
785 if (ret < 0) {
786 goto error;
787 }
788 }
789 goto error;
790 }
791 }
792 session_unlock(session);
793 }
794 session_unlock_list();
795 return ret;
796
797 error:
798 session_unlock(session);
799 session_unlock_list();
800 return ret;
801 }
802
803 /*
804 * For each tracing session, update newly registered apps.
805 */
806 static void update_ust_app(int app_sock)
807 {
808 struct ltt_session *sess, *stmp;
809
810 session_lock_list();
811
812 /* For all tracing session(s) */
813 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
814 session_lock(sess);
815 if (sess->ust_session) {
816 ust_app_global_update(sess->ust_session, app_sock);
817 }
818 session_unlock(sess);
819 }
820
821 session_unlock_list();
822 }
823
824 /*
825 * This thread manage event coming from the kernel.
826 *
827 * Features supported in this thread:
828 * -) CPU Hotplug
829 */
830 static void *thread_manage_kernel(void *data)
831 {
832 int ret, i, pollfd, update_poll_flag = 1;
833 uint32_t revents, nb_fd;
834 char tmp;
835 struct lttng_poll_event events;
836
837 DBG("Thread manage kernel started");
838
839 ret = create_thread_poll_set(&events, 2);
840 if (ret < 0) {
841 goto error_poll_create;
842 }
843
844 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
845 if (ret < 0) {
846 goto error;
847 }
848
849 while (1) {
850 if (update_poll_flag == 1) {
851 /*
852 * Reset number of fd in the poll set. Always 2 since there is the thread
853 * quit pipe and the kernel pipe.
854 */
855 events.nb_fd = 2;
856
857 ret = update_kernel_poll(&events);
858 if (ret < 0) {
859 goto error;
860 }
861 update_poll_flag = 0;
862 }
863
864 nb_fd = LTTNG_POLL_GETNB(&events);
865
866 DBG("Thread kernel polling on %d fds", nb_fd);
867
868 /* Zeroed the poll events */
869 lttng_poll_reset(&events);
870
871 /* Poll infinite value of time */
872 restart:
873 ret = lttng_poll_wait(&events, -1);
874 if (ret < 0) {
875 /*
876 * Restart interrupted system call.
877 */
878 if (errno == EINTR) {
879 goto restart;
880 }
881 goto error;
882 } else if (ret == 0) {
883 /* Should not happen since timeout is infinite */
884 ERR("Return value of poll is 0 with an infinite timeout.\n"
885 "This should not have happened! Continuing...");
886 continue;
887 }
888
889 for (i = 0; i < nb_fd; i++) {
890 /* Fetch once the poll data */
891 revents = LTTNG_POLL_GETEV(&events, i);
892 pollfd = LTTNG_POLL_GETFD(&events, i);
893
894 /* Thread quit pipe has been closed. Killing thread. */
895 ret = check_thread_quit_pipe(pollfd, revents);
896 if (ret) {
897 goto error;
898 }
899
900 /* Check for data on kernel pipe */
901 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
902 ret = read(kernel_poll_pipe[0], &tmp, 1);
903 update_poll_flag = 1;
904 continue;
905 } else {
906 /*
907 * New CPU detected by the kernel. Adding kernel stream to
908 * kernel session and updating the kernel consumer
909 */
910 if (revents & LPOLLIN) {
911 ret = update_kernel_stream(&kconsumer_data, pollfd);
912 if (ret < 0) {
913 continue;
914 }
915 break;
916 /*
917 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
918 * and unregister kernel stream at this point.
919 */
920 }
921 }
922 }
923 }
924
925 error:
926 lttng_poll_clean(&events);
927 error_poll_create:
928 DBG("Kernel thread dying");
929 return NULL;
930 }
931
932 /*
933 * This thread manage the consumer error sent back to the session daemon.
934 */
935 static void *thread_manage_consumer(void *data)
936 {
937 int sock = -1, i, ret, pollfd;
938 uint32_t revents, nb_fd;
939 enum lttcomm_return_code code;
940 struct lttng_poll_event events;
941 struct consumer_data *consumer_data = data;
942
943 DBG("[thread] Manage consumer started");
944
945 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
946 if (ret < 0) {
947 goto error_listen;
948 }
949
950 /*
951 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
952 * Nothing more will be added to this poll set.
953 */
954 ret = create_thread_poll_set(&events, 2);
955 if (ret < 0) {
956 goto error_poll;
957 }
958
959 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
960 if (ret < 0) {
961 goto error;
962 }
963
964 nb_fd = LTTNG_POLL_GETNB(&events);
965
966 /* Inifinite blocking call, waiting for transmission */
967 restart:
968 ret = lttng_poll_wait(&events, -1);
969 if (ret < 0) {
970 /*
971 * Restart interrupted system call.
972 */
973 if (errno == EINTR) {
974 goto restart;
975 }
976 goto error;
977 }
978
979 for (i = 0; i < nb_fd; i++) {
980 /* Fetch once the poll data */
981 revents = LTTNG_POLL_GETEV(&events, i);
982 pollfd = LTTNG_POLL_GETFD(&events, i);
983
984 /* Thread quit pipe has been closed. Killing thread. */
985 ret = check_thread_quit_pipe(pollfd, revents);
986 if (ret) {
987 goto error;
988 }
989
990 /* Event on the registration socket */
991 if (pollfd == consumer_data->err_sock) {
992 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
993 ERR("consumer err socket poll error");
994 goto error;
995 }
996 }
997 }
998
999 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1000 if (sock < 0) {
1001 goto error;
1002 }
1003
1004 DBG2("Receiving code from consumer err_sock");
1005
1006 /* Getting status code from kconsumerd */
1007 ret = lttcomm_recv_unix_sock(sock, &code,
1008 sizeof(enum lttcomm_return_code));
1009 if (ret <= 0) {
1010 goto error;
1011 }
1012
1013 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1014 consumer_data->cmd_sock =
1015 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1016 if (consumer_data->cmd_sock < 0) {
1017 sem_post(&consumer_data->sem);
1018 PERROR("consumer connect");
1019 goto error;
1020 }
1021 /* Signal condition to tell that the kconsumerd is ready */
1022 sem_post(&consumer_data->sem);
1023 DBG("consumer command socket ready");
1024 } else {
1025 ERR("consumer error when waiting for SOCK_READY : %s",
1026 lttcomm_get_readable_code(-code));
1027 goto error;
1028 }
1029
1030 /* Remove the kconsumerd error sock since we've established a connexion */
1031 ret = lttng_poll_del(&events, consumer_data->err_sock);
1032 if (ret < 0) {
1033 goto error;
1034 }
1035
1036 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1037 if (ret < 0) {
1038 goto error;
1039 }
1040
1041 /* Update number of fd */
1042 nb_fd = LTTNG_POLL_GETNB(&events);
1043
1044 /* Inifinite blocking call, waiting for transmission */
1045 restart_poll:
1046 ret = lttng_poll_wait(&events, -1);
1047 if (ret < 0) {
1048 /*
1049 * Restart interrupted system call.
1050 */
1051 if (errno == EINTR) {
1052 goto restart_poll;
1053 }
1054 goto error;
1055 }
1056
1057 for (i = 0; i < nb_fd; i++) {
1058 /* Fetch once the poll data */
1059 revents = LTTNG_POLL_GETEV(&events, i);
1060 pollfd = LTTNG_POLL_GETFD(&events, i);
1061
1062 /* Thread quit pipe has been closed. Killing thread. */
1063 ret = check_thread_quit_pipe(pollfd, revents);
1064 if (ret) {
1065 goto error;
1066 }
1067
1068 /* Event on the kconsumerd socket */
1069 if (pollfd == sock) {
1070 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1071 ERR("consumer err socket second poll error");
1072 goto error;
1073 }
1074 }
1075 }
1076
1077 /* Wait for any kconsumerd error */
1078 ret = lttcomm_recv_unix_sock(sock, &code,
1079 sizeof(enum lttcomm_return_code));
1080 if (ret <= 0) {
1081 ERR("consumer closed the command socket");
1082 goto error;
1083 }
1084
1085 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1086
1087 error:
1088 if (consumer_data->err_sock >= 0) {
1089 ret = close(consumer_data->err_sock);
1090 if (ret) {
1091 PERROR("close");
1092 }
1093 }
1094 if (consumer_data->cmd_sock >= 0) {
1095 ret = close(consumer_data->cmd_sock);
1096 if (ret) {
1097 PERROR("close");
1098 }
1099 }
1100 if (sock >= 0) {
1101 ret = close(sock);
1102 if (ret) {
1103 PERROR("close");
1104 }
1105 }
1106
1107 unlink(consumer_data->err_unix_sock_path);
1108 unlink(consumer_data->cmd_unix_sock_path);
1109 consumer_data->pid = 0;
1110
1111 lttng_poll_clean(&events);
1112 error_poll:
1113 error_listen:
1114 DBG("consumer thread cleanup completed");
1115
1116 return NULL;
1117 }
1118
1119 /*
1120 * This thread manage application communication.
1121 */
1122 static void *thread_manage_apps(void *data)
1123 {
1124 int i, ret, pollfd;
1125 uint32_t revents, nb_fd;
1126 struct ust_command ust_cmd;
1127 struct lttng_poll_event events;
1128
1129 DBG("[thread] Manage application started");
1130
1131 rcu_register_thread();
1132 rcu_thread_online();
1133
1134 ret = create_thread_poll_set(&events, 2);
1135 if (ret < 0) {
1136 goto error_poll_create;
1137 }
1138
1139 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1140 if (ret < 0) {
1141 goto error;
1142 }
1143
1144 while (1) {
1145 /* Zeroed the events structure */
1146 lttng_poll_reset(&events);
1147
1148 nb_fd = LTTNG_POLL_GETNB(&events);
1149
1150 DBG("Apps thread polling on %d fds", nb_fd);
1151
1152 /* Inifinite blocking call, waiting for transmission */
1153 restart:
1154 ret = lttng_poll_wait(&events, -1);
1155 if (ret < 0) {
1156 /*
1157 * Restart interrupted system call.
1158 */
1159 if (errno == EINTR) {
1160 goto restart;
1161 }
1162 goto error;
1163 }
1164
1165 for (i = 0; i < nb_fd; i++) {
1166 /* Fetch once the poll data */
1167 revents = LTTNG_POLL_GETEV(&events, i);
1168 pollfd = LTTNG_POLL_GETFD(&events, i);
1169
1170 /* Thread quit pipe has been closed. Killing thread. */
1171 ret = check_thread_quit_pipe(pollfd, revents);
1172 if (ret) {
1173 goto error;
1174 }
1175
1176 /* Inspect the apps cmd pipe */
1177 if (pollfd == apps_cmd_pipe[0]) {
1178 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1179 ERR("Apps command pipe error");
1180 goto error;
1181 } else if (revents & LPOLLIN) {
1182 /* Empty pipe */
1183 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1184 if (ret < 0 || ret < sizeof(ust_cmd)) {
1185 PERROR("read apps cmd pipe");
1186 goto error;
1187 }
1188
1189 /* Register applicaton to the session daemon */
1190 ret = ust_app_register(&ust_cmd.reg_msg,
1191 ust_cmd.sock);
1192 if (ret == -ENOMEM) {
1193 goto error;
1194 } else if (ret < 0) {
1195 break;
1196 }
1197
1198 /*
1199 * Validate UST version compatibility.
1200 */
1201 ret = ust_app_validate_version(ust_cmd.sock);
1202 if (ret >= 0) {
1203 /*
1204 * Add channel(s) and event(s) to newly registered apps
1205 * from lttng global UST domain.
1206 */
1207 update_ust_app(ust_cmd.sock);
1208 }
1209
1210 ret = ust_app_register_done(ust_cmd.sock);
1211 if (ret < 0) {
1212 /*
1213 * If the registration is not possible, we simply
1214 * unregister the apps and continue
1215 */
1216 ust_app_unregister(ust_cmd.sock);
1217 } else {
1218 /*
1219 * We just need here to monitor the close of the UST
1220 * socket and poll set monitor those by default.
1221 * Listen on POLLIN (even if we never expect any
1222 * data) to ensure that hangup wakes us.
1223 */
1224 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
1225 if (ret < 0) {
1226 goto error;
1227 }
1228
1229 DBG("Apps with sock %d added to poll set",
1230 ust_cmd.sock);
1231 }
1232
1233 break;
1234 }
1235 } else {
1236 /*
1237 * At this point, we know that a registered application made
1238 * the event at poll_wait.
1239 */
1240 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1241 /* Removing from the poll set */
1242 ret = lttng_poll_del(&events, pollfd);
1243 if (ret < 0) {
1244 goto error;
1245 }
1246
1247 /* Socket closed on remote end. */
1248 ust_app_unregister(pollfd);
1249 break;
1250 }
1251 }
1252 }
1253 }
1254
1255 error:
1256 lttng_poll_clean(&events);
1257 error_poll_create:
1258 DBG("Application communication apps thread cleanup complete");
1259 rcu_thread_offline();
1260 rcu_unregister_thread();
1261 return NULL;
1262 }
1263
1264 /*
1265 * Dispatch request from the registration threads to the application
1266 * communication thread.
1267 */
1268 static void *thread_dispatch_ust_registration(void *data)
1269 {
1270 int ret;
1271 struct cds_wfq_node *node;
1272 struct ust_command *ust_cmd = NULL;
1273
1274 DBG("[thread] Dispatch UST command started");
1275
1276 while (!dispatch_thread_exit) {
1277 /* Atomically prepare the queue futex */
1278 futex_nto1_prepare(&ust_cmd_queue.futex);
1279
1280 do {
1281 /* Dequeue command for registration */
1282 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1283 if (node == NULL) {
1284 DBG("Woken up but nothing in the UST command queue");
1285 /* Continue thread execution */
1286 break;
1287 }
1288
1289 ust_cmd = caa_container_of(node, struct ust_command, node);
1290
1291 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1292 " gid:%d sock:%d name:%s (version %d.%d)",
1293 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1294 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1295 ust_cmd->sock, ust_cmd->reg_msg.name,
1296 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1297 /*
1298 * Inform apps thread of the new application registration. This
1299 * call is blocking so we can be assured that the data will be read
1300 * at some point in time or wait to the end of the world :)
1301 */
1302 ret = write(apps_cmd_pipe[1], ust_cmd,
1303 sizeof(struct ust_command));
1304 if (ret < 0) {
1305 PERROR("write apps cmd pipe");
1306 if (errno == EBADF) {
1307 /*
1308 * We can't inform the application thread to process
1309 * registration. We will exit or else application
1310 * registration will not occur and tracing will never
1311 * start.
1312 */
1313 goto error;
1314 }
1315 }
1316 free(ust_cmd);
1317 } while (node != NULL);
1318
1319 /* Futex wait on queue. Blocking call on futex() */
1320 futex_nto1_wait(&ust_cmd_queue.futex);
1321 }
1322
1323 error:
1324 DBG("Dispatch thread dying");
1325 return NULL;
1326 }
1327
1328 /*
1329 * This thread manage application registration.
1330 */
1331 static void *thread_registration_apps(void *data)
1332 {
1333 int sock = -1, i, ret, pollfd;
1334 uint32_t revents, nb_fd;
1335 struct lttng_poll_event events;
1336 /*
1337 * Get allocated in this thread, enqueued to a global queue, dequeued and
1338 * freed in the manage apps thread.
1339 */
1340 struct ust_command *ust_cmd = NULL;
1341
1342 DBG("[thread] Manage application registration started");
1343
1344 ret = lttcomm_listen_unix_sock(apps_sock);
1345 if (ret < 0) {
1346 goto error_listen;
1347 }
1348
1349 /*
1350 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1351 * more will be added to this poll set.
1352 */
1353 ret = create_thread_poll_set(&events, 2);
1354 if (ret < 0) {
1355 goto error_create_poll;
1356 }
1357
1358 /* Add the application registration socket */
1359 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1360 if (ret < 0) {
1361 goto error_poll_add;
1362 }
1363
1364 /* Notify all applications to register */
1365 ret = notify_ust_apps(1);
1366 if (ret < 0) {
1367 ERR("Failed to notify applications or create the wait shared memory.\n"
1368 "Execution continues but there might be problem for already\n"
1369 "running applications that wishes to register.");
1370 }
1371
1372 while (1) {
1373 DBG("Accepting application registration");
1374
1375 nb_fd = LTTNG_POLL_GETNB(&events);
1376
1377 /* Inifinite blocking call, waiting for transmission */
1378 restart:
1379 ret = lttng_poll_wait(&events, -1);
1380 if (ret < 0) {
1381 /*
1382 * Restart interrupted system call.
1383 */
1384 if (errno == EINTR) {
1385 goto restart;
1386 }
1387 goto error;
1388 }
1389
1390 for (i = 0; i < nb_fd; i++) {
1391 /* Fetch once the poll data */
1392 revents = LTTNG_POLL_GETEV(&events, i);
1393 pollfd = LTTNG_POLL_GETFD(&events, i);
1394
1395 /* Thread quit pipe has been closed. Killing thread. */
1396 ret = check_thread_quit_pipe(pollfd, revents);
1397 if (ret) {
1398 goto error;
1399 }
1400
1401 /* Event on the registration socket */
1402 if (pollfd == apps_sock) {
1403 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1404 ERR("Register apps socket poll error");
1405 goto error;
1406 } else if (revents & LPOLLIN) {
1407 sock = lttcomm_accept_unix_sock(apps_sock);
1408 if (sock < 0) {
1409 goto error;
1410 }
1411
1412 /* Create UST registration command for enqueuing */
1413 ust_cmd = zmalloc(sizeof(struct ust_command));
1414 if (ust_cmd == NULL) {
1415 PERROR("ust command zmalloc");
1416 goto error;
1417 }
1418
1419 /*
1420 * Using message-based transmissions to ensure we don't
1421 * have to deal with partially received messages.
1422 */
1423 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1424 sizeof(struct ust_register_msg));
1425 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1426 if (ret < 0) {
1427 PERROR("lttcomm_recv_unix_sock register apps");
1428 } else {
1429 ERR("Wrong size received on apps register");
1430 }
1431 free(ust_cmd);
1432 ret = close(sock);
1433 if (ret) {
1434 PERROR("close");
1435 }
1436 sock = -1;
1437 continue;
1438 }
1439
1440 ust_cmd->sock = sock;
1441 sock = -1;
1442
1443 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1444 " gid:%d sock:%d name:%s (version %d.%d)",
1445 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1446 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1447 ust_cmd->sock, ust_cmd->reg_msg.name,
1448 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1449
1450 /*
1451 * Lock free enqueue the registration request. The red pill
1452 * has been taken! This apps will be part of the *system*.
1453 */
1454 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1455
1456 /*
1457 * Wake the registration queue futex. Implicit memory
1458 * barrier with the exchange in cds_wfq_enqueue.
1459 */
1460 futex_nto1_wake(&ust_cmd_queue.futex);
1461 }
1462 }
1463 }
1464 }
1465
1466 error:
1467 /* Notify that the registration thread is gone */
1468 notify_ust_apps(0);
1469
1470 if (apps_sock >= 0) {
1471 ret = close(apps_sock);
1472 if (ret) {
1473 PERROR("close");
1474 }
1475 }
1476 if (sock >= 0) {
1477 ret = close(sock);
1478 if (ret) {
1479 PERROR("close");
1480 }
1481 }
1482 unlink(apps_unix_sock_path);
1483
1484 error_poll_add:
1485 lttng_poll_clean(&events);
1486 error_listen:
1487 error_create_poll:
1488 DBG("UST Registration thread cleanup complete");
1489
1490 return NULL;
1491 }
1492
1493 /*
1494 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1495 * exec or it will fails.
1496 */
1497 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1498 {
1499 int ret;
1500 struct timespec timeout;
1501
1502 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1503 timeout.tv_nsec = 0;
1504
1505 /* Setup semaphore */
1506 ret = sem_init(&consumer_data->sem, 0, 0);
1507 if (ret < 0) {
1508 PERROR("sem_init consumer semaphore");
1509 goto error;
1510 }
1511
1512 ret = pthread_create(&consumer_data->thread, NULL,
1513 thread_manage_consumer, consumer_data);
1514 if (ret != 0) {
1515 PERROR("pthread_create consumer");
1516 ret = -1;
1517 goto error;
1518 }
1519
1520 /* Get time for sem_timedwait absolute timeout */
1521 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1522 if (ret < 0) {
1523 PERROR("clock_gettime spawn consumer");
1524 /* Infinite wait for the kconsumerd thread to be ready */
1525 ret = sem_wait(&consumer_data->sem);
1526 } else {
1527 /* Normal timeout if the gettime was successful */
1528 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1529 ret = sem_timedwait(&consumer_data->sem, &timeout);
1530 }
1531
1532 if (ret < 0) {
1533 if (errno == ETIMEDOUT) {
1534 /*
1535 * Call has timed out so we kill the kconsumerd_thread and return
1536 * an error.
1537 */
1538 ERR("The consumer thread was never ready. Killing it");
1539 ret = pthread_cancel(consumer_data->thread);
1540 if (ret < 0) {
1541 PERROR("pthread_cancel consumer thread");
1542 }
1543 } else {
1544 PERROR("semaphore wait failed consumer thread");
1545 }
1546 goto error;
1547 }
1548
1549 pthread_mutex_lock(&consumer_data->pid_mutex);
1550 if (consumer_data->pid == 0) {
1551 ERR("Kconsumerd did not start");
1552 pthread_mutex_unlock(&consumer_data->pid_mutex);
1553 goto error;
1554 }
1555 pthread_mutex_unlock(&consumer_data->pid_mutex);
1556
1557 return 0;
1558
1559 error:
1560 return ret;
1561 }
1562
1563 /*
1564 * Join consumer thread
1565 */
1566 static int join_consumer_thread(struct consumer_data *consumer_data)
1567 {
1568 void *status;
1569 int ret;
1570
1571 if (consumer_data->pid != 0) {
1572 ret = kill(consumer_data->pid, SIGTERM);
1573 if (ret) {
1574 ERR("Error killing consumer daemon");
1575 return ret;
1576 }
1577 return pthread_join(consumer_data->thread, &status);
1578 } else {
1579 return 0;
1580 }
1581 }
1582
1583 /*
1584 * Fork and exec a consumer daemon (consumerd).
1585 *
1586 * Return pid if successful else -1.
1587 */
1588 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1589 {
1590 int ret;
1591 pid_t pid;
1592 const char *consumer_to_use;
1593 const char *verbosity;
1594 struct stat st;
1595
1596 DBG("Spawning consumerd");
1597
1598 pid = fork();
1599 if (pid == 0) {
1600 /*
1601 * Exec consumerd.
1602 */
1603 if (opt_verbose_consumer) {
1604 verbosity = "--verbose";
1605 } else {
1606 verbosity = "--quiet";
1607 }
1608 switch (consumer_data->type) {
1609 case LTTNG_CONSUMER_KERNEL:
1610 /*
1611 * Find out which consumerd to execute. We will first try the
1612 * 64-bit path, then the sessiond's installation directory, and
1613 * fallback on the 32-bit one,
1614 */
1615 DBG3("Looking for a kernel consumer at these locations:");
1616 DBG3(" 1) %s", consumerd64_bin);
1617 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1618 DBG3(" 3) %s", consumerd32_bin);
1619 if (stat(consumerd64_bin, &st) == 0) {
1620 DBG3("Found location #1");
1621 consumer_to_use = consumerd64_bin;
1622 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1623 DBG3("Found location #2");
1624 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1625 } else if (stat(consumerd32_bin, &st) == 0) {
1626 DBG3("Found location #3");
1627 consumer_to_use = consumerd32_bin;
1628 } else {
1629 DBG("Could not find any valid consumerd executable");
1630 break;
1631 }
1632 DBG("Using kernel consumer at: %s", consumer_to_use);
1633 execl(consumer_to_use,
1634 "lttng-consumerd", verbosity, "-k",
1635 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1636 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1637 NULL);
1638 break;
1639 case LTTNG_CONSUMER64_UST:
1640 {
1641 char *tmpnew = NULL;
1642
1643 if (consumerd64_libdir[0] != '\0') {
1644 char *tmp;
1645 size_t tmplen;
1646
1647 tmp = getenv("LD_LIBRARY_PATH");
1648 if (!tmp) {
1649 tmp = "";
1650 }
1651 tmplen = strlen("LD_LIBRARY_PATH=")
1652 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1653 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1654 if (!tmpnew) {
1655 ret = -ENOMEM;
1656 goto error;
1657 }
1658 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1659 strcat(tmpnew, consumerd64_libdir);
1660 if (tmp[0] != '\0') {
1661 strcat(tmpnew, ":");
1662 strcat(tmpnew, tmp);
1663 }
1664 ret = putenv(tmpnew);
1665 if (ret) {
1666 ret = -errno;
1667 goto error;
1668 }
1669 }
1670 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1671 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1672 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1673 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1674 NULL);
1675 if (consumerd64_libdir[0] != '\0') {
1676 free(tmpnew);
1677 }
1678 if (ret) {
1679 goto error;
1680 }
1681 break;
1682 }
1683 case LTTNG_CONSUMER32_UST:
1684 {
1685 char *tmpnew = NULL;
1686
1687 if (consumerd32_libdir[0] != '\0') {
1688 char *tmp;
1689 size_t tmplen;
1690
1691 tmp = getenv("LD_LIBRARY_PATH");
1692 if (!tmp) {
1693 tmp = "";
1694 }
1695 tmplen = strlen("LD_LIBRARY_PATH=")
1696 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1697 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1698 if (!tmpnew) {
1699 ret = -ENOMEM;
1700 goto error;
1701 }
1702 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1703 strcat(tmpnew, consumerd32_libdir);
1704 if (tmp[0] != '\0') {
1705 strcat(tmpnew, ":");
1706 strcat(tmpnew, tmp);
1707 }
1708 ret = putenv(tmpnew);
1709 if (ret) {
1710 ret = -errno;
1711 goto error;
1712 }
1713 }
1714 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1715 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1716 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1717 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1718 NULL);
1719 if (consumerd32_libdir[0] != '\0') {
1720 free(tmpnew);
1721 }
1722 if (ret) {
1723 goto error;
1724 }
1725 break;
1726 }
1727 default:
1728 PERROR("unknown consumer type");
1729 exit(EXIT_FAILURE);
1730 }
1731 if (errno != 0) {
1732 PERROR("kernel start consumer exec");
1733 }
1734 exit(EXIT_FAILURE);
1735 } else if (pid > 0) {
1736 ret = pid;
1737 } else {
1738 PERROR("start consumer fork");
1739 ret = -errno;
1740 }
1741 error:
1742 return ret;
1743 }
1744
1745 /*
1746 * Spawn the consumerd daemon and session daemon thread.
1747 */
1748 static int start_consumerd(struct consumer_data *consumer_data)
1749 {
1750 int ret;
1751
1752 pthread_mutex_lock(&consumer_data->pid_mutex);
1753 if (consumer_data->pid != 0) {
1754 pthread_mutex_unlock(&consumer_data->pid_mutex);
1755 goto end;
1756 }
1757
1758 ret = spawn_consumerd(consumer_data);
1759 if (ret < 0) {
1760 ERR("Spawning consumerd failed");
1761 pthread_mutex_unlock(&consumer_data->pid_mutex);
1762 goto error;
1763 }
1764
1765 /* Setting up the consumer_data pid */
1766 consumer_data->pid = ret;
1767 DBG2("Consumer pid %d", consumer_data->pid);
1768 pthread_mutex_unlock(&consumer_data->pid_mutex);
1769
1770 DBG2("Spawning consumer control thread");
1771 ret = spawn_consumer_thread(consumer_data);
1772 if (ret < 0) {
1773 ERR("Fatal error spawning consumer control thread");
1774 goto error;
1775 }
1776
1777 end:
1778 return 0;
1779
1780 error:
1781 return ret;
1782 }
1783
1784 /*
1785 * Check version of the lttng-modules.
1786 */
1787 static int validate_lttng_modules_version(void)
1788 {
1789 return kernel_validate_version(kernel_tracer_fd);
1790 }
1791
1792 /*
1793 * Setup necessary data for kernel tracer action.
1794 */
1795 static int init_kernel_tracer(void)
1796 {
1797 int ret;
1798
1799 /* Modprobe lttng kernel modules */
1800 ret = modprobe_lttng_control();
1801 if (ret < 0) {
1802 goto error;
1803 }
1804
1805 /* Open debugfs lttng */
1806 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1807 if (kernel_tracer_fd < 0) {
1808 DBG("Failed to open %s", module_proc_lttng);
1809 ret = -1;
1810 goto error_open;
1811 }
1812
1813 /* Validate kernel version */
1814 ret = validate_lttng_modules_version();
1815 if (ret < 0) {
1816 goto error_version;
1817 }
1818
1819 ret = modprobe_lttng_data();
1820 if (ret < 0) {
1821 goto error_modules;
1822 }
1823
1824 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1825 return 0;
1826
1827 error_version:
1828 modprobe_remove_lttng_control();
1829 ret = close(kernel_tracer_fd);
1830 if (ret) {
1831 PERROR("close");
1832 }
1833 kernel_tracer_fd = -1;
1834 return LTTCOMM_KERN_VERSION;
1835
1836 error_modules:
1837 ret = close(kernel_tracer_fd);
1838 if (ret) {
1839 PERROR("close");
1840 }
1841
1842 error_open:
1843 modprobe_remove_lttng_control();
1844
1845 error:
1846 WARN("No kernel tracer available");
1847 kernel_tracer_fd = -1;
1848 if (!is_root) {
1849 return LTTCOMM_NEED_ROOT_SESSIOND;
1850 } else {
1851 return LTTCOMM_KERN_NA;
1852 }
1853 }
1854
1855 /*
1856 * Init tracing by creating trace directory and sending fds kernel consumer.
1857 */
1858 static int init_kernel_tracing(struct ltt_kernel_session *session)
1859 {
1860 int ret = 0;
1861
1862 if (session->consumer_fds_sent == 0) {
1863 /*
1864 * Assign default kernel consumer socket if no consumer assigned to the
1865 * kernel session. At this point, it's NOT supposed to be -1 but this is
1866 * an extra security check.
1867 */
1868 if (session->consumer_fd < 0) {
1869 session->consumer_fd = kconsumer_data.cmd_sock;
1870 }
1871
1872 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1873 if (ret < 0) {
1874 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1875 goto error;
1876 }
1877
1878 session->consumer_fds_sent = 1;
1879 }
1880
1881 error:
1882 return ret;
1883 }
1884
1885 /*
1886 * Create an UST session and add it to the session ust list.
1887 */
1888 static int create_ust_session(struct ltt_session *session,
1889 struct lttng_domain *domain)
1890 {
1891 struct ltt_ust_session *lus = NULL;
1892 int ret;
1893
1894 switch (domain->type) {
1895 case LTTNG_DOMAIN_UST:
1896 break;
1897 default:
1898 ret = LTTCOMM_UNKNOWN_DOMAIN;
1899 goto error;
1900 }
1901
1902 DBG("Creating UST session");
1903
1904 lus = trace_ust_create_session(session->path, session->id, domain);
1905 if (lus == NULL) {
1906 ret = LTTCOMM_UST_SESS_FAIL;
1907 goto error;
1908 }
1909
1910 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1911 session->uid, session->gid);
1912 if (ret < 0) {
1913 if (ret != -EEXIST) {
1914 ERR("Trace directory creation error");
1915 ret = LTTCOMM_UST_SESS_FAIL;
1916 goto error;
1917 }
1918 }
1919
1920 /* The domain type dictate different actions on session creation */
1921 switch (domain->type) {
1922 case LTTNG_DOMAIN_UST:
1923 /* No ustctl for the global UST domain */
1924 break;
1925 default:
1926 ERR("Unknown UST domain on create session %d", domain->type);
1927 goto error;
1928 }
1929 lus->uid = session->uid;
1930 lus->gid = session->gid;
1931 session->ust_session = lus;
1932
1933 return LTTCOMM_OK;
1934
1935 error:
1936 free(lus);
1937 return ret;
1938 }
1939
1940 /*
1941 * Create a kernel tracer session then create the default channel.
1942 */
1943 static int create_kernel_session(struct ltt_session *session)
1944 {
1945 int ret;
1946
1947 DBG("Creating kernel session");
1948
1949 ret = kernel_create_session(session, kernel_tracer_fd);
1950 if (ret < 0) {
1951 ret = LTTCOMM_KERN_SESS_FAIL;
1952 goto error;
1953 }
1954
1955 /* Set kernel consumer socket fd */
1956 if (kconsumer_data.cmd_sock >= 0) {
1957 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1958 }
1959
1960 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1961 S_IRWXU | S_IRWXG, session->uid, session->gid);
1962 if (ret < 0) {
1963 if (ret != -EEXIST) {
1964 ERR("Trace directory creation error");
1965 goto error;
1966 }
1967 }
1968 session->kernel_session->uid = session->uid;
1969 session->kernel_session->gid = session->gid;
1970
1971 error:
1972 return ret;
1973 }
1974
1975 /*
1976 * Check if the UID or GID match the session. Root user has access to all
1977 * sessions.
1978 */
1979 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1980 {
1981 if (uid != session->uid && gid != session->gid && uid != 0) {
1982 return 0;
1983 } else {
1984 return 1;
1985 }
1986 }
1987
1988 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1989 {
1990 unsigned int i = 0;
1991 struct ltt_session *session;
1992
1993 DBG("Counting number of available session for UID %d GID %d",
1994 uid, gid);
1995 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1996 /*
1997 * Only list the sessions the user can control.
1998 */
1999 if (!session_access_ok(session, uid, gid)) {
2000 continue;
2001 }
2002 i++;
2003 }
2004 return i;
2005 }
2006
2007 /*
2008 * Using the session list, filled a lttng_session array to send back to the
2009 * client for session listing.
2010 *
2011 * The session list lock MUST be acquired before calling this function. Use
2012 * session_lock_list() and session_unlock_list().
2013 */
2014 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2015 gid_t gid)
2016 {
2017 unsigned int i = 0;
2018 struct ltt_session *session;
2019
2020 DBG("Getting all available session for UID %d GID %d",
2021 uid, gid);
2022 /*
2023 * Iterate over session list and append data after the control struct in
2024 * the buffer.
2025 */
2026 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2027 /*
2028 * Only list the sessions the user can control.
2029 */
2030 if (!session_access_ok(session, uid, gid)) {
2031 continue;
2032 }
2033 strncpy(sessions[i].path, session->path, PATH_MAX);
2034 sessions[i].path[PATH_MAX - 1] = '\0';
2035 strncpy(sessions[i].name, session->name, NAME_MAX);
2036 sessions[i].name[NAME_MAX - 1] = '\0';
2037 sessions[i].enabled = session->enabled;
2038 i++;
2039 }
2040 }
2041
2042 /*
2043 * Fill lttng_channel array of all channels.
2044 */
2045 static void list_lttng_channels(int domain, struct ltt_session *session,
2046 struct lttng_channel *channels)
2047 {
2048 int i = 0;
2049 struct ltt_kernel_channel *kchan;
2050
2051 DBG("Listing channels for session %s", session->name);
2052
2053 switch (domain) {
2054 case LTTNG_DOMAIN_KERNEL:
2055 /* Kernel channels */
2056 if (session->kernel_session != NULL) {
2057 cds_list_for_each_entry(kchan,
2058 &session->kernel_session->channel_list.head, list) {
2059 /* Copy lttng_channel struct to array */
2060 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2061 channels[i].enabled = kchan->enabled;
2062 i++;
2063 }
2064 }
2065 break;
2066 case LTTNG_DOMAIN_UST:
2067 {
2068 struct lttng_ht_iter iter;
2069 struct ltt_ust_channel *uchan;
2070
2071 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2072 &iter.iter, uchan, node.node) {
2073 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2074 channels[i].attr.overwrite = uchan->attr.overwrite;
2075 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2076 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2077 channels[i].attr.switch_timer_interval =
2078 uchan->attr.switch_timer_interval;
2079 channels[i].attr.read_timer_interval =
2080 uchan->attr.read_timer_interval;
2081 channels[i].enabled = uchan->enabled;
2082 switch (uchan->attr.output) {
2083 case LTTNG_UST_MMAP:
2084 default:
2085 channels[i].attr.output = LTTNG_EVENT_MMAP;
2086 break;
2087 }
2088 i++;
2089 }
2090 break;
2091 }
2092 default:
2093 break;
2094 }
2095 }
2096
2097 /*
2098 * Create a list of ust global domain events.
2099 */
2100 static int list_lttng_ust_global_events(char *channel_name,
2101 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2102 {
2103 int i = 0, ret = 0;
2104 unsigned int nb_event = 0;
2105 struct lttng_ht_iter iter;
2106 struct lttng_ht_node_str *node;
2107 struct ltt_ust_channel *uchan;
2108 struct ltt_ust_event *uevent;
2109 struct lttng_event *tmp;
2110
2111 DBG("Listing UST global events for channel %s", channel_name);
2112
2113 rcu_read_lock();
2114
2115 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2116 node = lttng_ht_iter_get_node_str(&iter);
2117 if (node == NULL) {
2118 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2119 goto error;
2120 }
2121
2122 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2123
2124 nb_event += lttng_ht_get_count(uchan->events);
2125
2126 if (nb_event == 0) {
2127 ret = nb_event;
2128 goto error;
2129 }
2130
2131 DBG3("Listing UST global %d events", nb_event);
2132
2133 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2134 if (tmp == NULL) {
2135 ret = -LTTCOMM_FATAL;
2136 goto error;
2137 }
2138
2139 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2140 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2141 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2142 tmp[i].enabled = uevent->enabled;
2143 switch (uevent->attr.instrumentation) {
2144 case LTTNG_UST_TRACEPOINT:
2145 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2146 break;
2147 case LTTNG_UST_PROBE:
2148 tmp[i].type = LTTNG_EVENT_PROBE;
2149 break;
2150 case LTTNG_UST_FUNCTION:
2151 tmp[i].type = LTTNG_EVENT_FUNCTION;
2152 break;
2153 }
2154 tmp[i].loglevel = uevent->attr.loglevel;
2155 switch (uevent->attr.loglevel_type) {
2156 case LTTNG_UST_LOGLEVEL_ALL:
2157 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2158 break;
2159 case LTTNG_UST_LOGLEVEL_RANGE:
2160 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2161 break;
2162 case LTTNG_UST_LOGLEVEL_SINGLE:
2163 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2164 break;
2165 }
2166 i++;
2167 }
2168
2169 ret = nb_event;
2170 *events = tmp;
2171
2172 error:
2173 rcu_read_unlock();
2174 return ret;
2175 }
2176
2177 /*
2178 * Fill lttng_event array of all kernel events in the channel.
2179 */
2180 static int list_lttng_kernel_events(char *channel_name,
2181 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2182 {
2183 int i = 0, ret;
2184 unsigned int nb_event;
2185 struct ltt_kernel_event *event;
2186 struct ltt_kernel_channel *kchan;
2187
2188 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2189 if (kchan == NULL) {
2190 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2191 goto error;
2192 }
2193
2194 nb_event = kchan->event_count;
2195
2196 DBG("Listing events for channel %s", kchan->channel->name);
2197
2198 if (nb_event == 0) {
2199 ret = nb_event;
2200 goto error;
2201 }
2202
2203 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2204 if (*events == NULL) {
2205 ret = LTTCOMM_FATAL;
2206 goto error;
2207 }
2208
2209 /* Kernel channels */
2210 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2211 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2212 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2213 (*events)[i].enabled = event->enabled;
2214 switch (event->event->instrumentation) {
2215 case LTTNG_KERNEL_TRACEPOINT:
2216 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2217 break;
2218 case LTTNG_KERNEL_KPROBE:
2219 case LTTNG_KERNEL_KRETPROBE:
2220 (*events)[i].type = LTTNG_EVENT_PROBE;
2221 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2222 sizeof(struct lttng_kernel_kprobe));
2223 break;
2224 case LTTNG_KERNEL_FUNCTION:
2225 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2226 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2227 sizeof(struct lttng_kernel_function));
2228 break;
2229 case LTTNG_KERNEL_NOOP:
2230 (*events)[i].type = LTTNG_EVENT_NOOP;
2231 break;
2232 case LTTNG_KERNEL_SYSCALL:
2233 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2234 break;
2235 case LTTNG_KERNEL_ALL:
2236 assert(0);
2237 break;
2238 }
2239 i++;
2240 }
2241
2242 return nb_event;
2243
2244 error:
2245 return ret;
2246 }
2247
2248 /*
2249 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2250 */
2251 static int cmd_disable_channel(struct ltt_session *session,
2252 int domain, char *channel_name)
2253 {
2254 int ret;
2255 struct ltt_ust_session *usess;
2256
2257 usess = session->ust_session;
2258
2259 switch (domain) {
2260 case LTTNG_DOMAIN_KERNEL:
2261 {
2262 ret = channel_kernel_disable(session->kernel_session,
2263 channel_name);
2264 if (ret != LTTCOMM_OK) {
2265 goto error;
2266 }
2267
2268 kernel_wait_quiescent(kernel_tracer_fd);
2269 break;
2270 }
2271 case LTTNG_DOMAIN_UST:
2272 {
2273 struct ltt_ust_channel *uchan;
2274 struct lttng_ht *chan_ht;
2275
2276 chan_ht = usess->domain_global.channels;
2277
2278 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2279 if (uchan == NULL) {
2280 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2281 goto error;
2282 }
2283
2284 ret = channel_ust_disable(usess, domain, uchan);
2285 if (ret != LTTCOMM_OK) {
2286 goto error;
2287 }
2288 break;
2289 }
2290 #if 0
2291 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2292 case LTTNG_DOMAIN_UST_EXEC_NAME:
2293 case LTTNG_DOMAIN_UST_PID:
2294 #endif
2295 default:
2296 ret = LTTCOMM_UNKNOWN_DOMAIN;
2297 goto error;
2298 }
2299
2300 ret = LTTCOMM_OK;
2301
2302 error:
2303 return ret;
2304 }
2305
2306 /*
2307 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2308 */
2309 static int cmd_enable_channel(struct ltt_session *session,
2310 int domain, struct lttng_channel *attr)
2311 {
2312 int ret;
2313 struct ltt_ust_session *usess = session->ust_session;
2314 struct lttng_ht *chan_ht;
2315
2316 DBG("Enabling channel %s for session %s", attr->name, session->name);
2317
2318 switch (domain) {
2319 case LTTNG_DOMAIN_KERNEL:
2320 {
2321 struct ltt_kernel_channel *kchan;
2322
2323 kchan = trace_kernel_get_channel_by_name(attr->name,
2324 session->kernel_session);
2325 if (kchan == NULL) {
2326 ret = channel_kernel_create(session->kernel_session,
2327 attr, kernel_poll_pipe[1]);
2328 } else {
2329 ret = channel_kernel_enable(session->kernel_session, kchan);
2330 }
2331
2332 if (ret != LTTCOMM_OK) {
2333 goto error;
2334 }
2335
2336 kernel_wait_quiescent(kernel_tracer_fd);
2337 break;
2338 }
2339 case LTTNG_DOMAIN_UST:
2340 {
2341 struct ltt_ust_channel *uchan;
2342
2343 chan_ht = usess->domain_global.channels;
2344
2345 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2346 if (uchan == NULL) {
2347 ret = channel_ust_create(usess, domain, attr);
2348 } else {
2349 ret = channel_ust_enable(usess, domain, uchan);
2350 }
2351 break;
2352 }
2353 #if 0
2354 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2355 case LTTNG_DOMAIN_UST_EXEC_NAME:
2356 case LTTNG_DOMAIN_UST_PID:
2357 #endif
2358 default:
2359 ret = LTTCOMM_UNKNOWN_DOMAIN;
2360 goto error;
2361 }
2362
2363 error:
2364 return ret;
2365 }
2366
2367 /*
2368 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2369 */
2370 static int cmd_disable_event(struct ltt_session *session, int domain,
2371 char *channel_name, char *event_name)
2372 {
2373 int ret;
2374
2375 switch (domain) {
2376 case LTTNG_DOMAIN_KERNEL:
2377 {
2378 struct ltt_kernel_channel *kchan;
2379 struct ltt_kernel_session *ksess;
2380
2381 ksess = session->kernel_session;
2382
2383 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2384 if (kchan == NULL) {
2385 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2386 goto error;
2387 }
2388
2389 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2390 if (ret != LTTCOMM_OK) {
2391 goto error;
2392 }
2393
2394 kernel_wait_quiescent(kernel_tracer_fd);
2395 break;
2396 }
2397 case LTTNG_DOMAIN_UST:
2398 {
2399 struct ltt_ust_channel *uchan;
2400 struct ltt_ust_session *usess;
2401
2402 usess = session->ust_session;
2403
2404 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2405 channel_name);
2406 if (uchan == NULL) {
2407 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2408 goto error;
2409 }
2410
2411 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2412 if (ret != LTTCOMM_OK) {
2413 goto error;
2414 }
2415
2416 DBG3("Disable UST event %s in channel %s completed", event_name,
2417 channel_name);
2418 break;
2419 }
2420 #if 0
2421 case LTTNG_DOMAIN_UST_EXEC_NAME:
2422 case LTTNG_DOMAIN_UST_PID:
2423 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2424 #endif
2425 default:
2426 ret = LTTCOMM_UND;
2427 goto error;
2428 }
2429
2430 ret = LTTCOMM_OK;
2431
2432 error:
2433 return ret;
2434 }
2435
2436 /*
2437 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2438 */
2439 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2440 char *channel_name)
2441 {
2442 int ret;
2443
2444 switch (domain) {
2445 case LTTNG_DOMAIN_KERNEL:
2446 {
2447 struct ltt_kernel_session *ksess;
2448 struct ltt_kernel_channel *kchan;
2449
2450 ksess = session->kernel_session;
2451
2452 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2453 if (kchan == NULL) {
2454 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2455 goto error;
2456 }
2457
2458 ret = event_kernel_disable_all(ksess, kchan);
2459 if (ret != LTTCOMM_OK) {
2460 goto error;
2461 }
2462
2463 kernel_wait_quiescent(kernel_tracer_fd);
2464 break;
2465 }
2466 case LTTNG_DOMAIN_UST:
2467 {
2468 struct ltt_ust_session *usess;
2469 struct ltt_ust_channel *uchan;
2470
2471 usess = session->ust_session;
2472
2473 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2474 channel_name);
2475 if (uchan == NULL) {
2476 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2477 goto error;
2478 }
2479
2480 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2481 if (ret != 0) {
2482 goto error;
2483 }
2484
2485 DBG3("Disable all UST events in channel %s completed", channel_name);
2486
2487 break;
2488 }
2489 #if 0
2490 case LTTNG_DOMAIN_UST_EXEC_NAME:
2491 case LTTNG_DOMAIN_UST_PID:
2492 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2493 #endif
2494 default:
2495 ret = LTTCOMM_UND;
2496 goto error;
2497 }
2498
2499 ret = LTTCOMM_OK;
2500
2501 error:
2502 return ret;
2503 }
2504
2505 /*
2506 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2507 */
2508 static int cmd_add_context(struct ltt_session *session, int domain,
2509 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2510 {
2511 int ret;
2512
2513 switch (domain) {
2514 case LTTNG_DOMAIN_KERNEL:
2515 /* Add kernel context to kernel tracer */
2516 ret = context_kernel_add(session->kernel_session, ctx,
2517 event_name, channel_name);
2518 if (ret != LTTCOMM_OK) {
2519 goto error;
2520 }
2521 break;
2522 case LTTNG_DOMAIN_UST:
2523 {
2524 struct ltt_ust_session *usess = session->ust_session;
2525
2526 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2527 if (ret != LTTCOMM_OK) {
2528 goto error;
2529 }
2530 break;
2531 }
2532 #if 0
2533 case LTTNG_DOMAIN_UST_EXEC_NAME:
2534 case LTTNG_DOMAIN_UST_PID:
2535 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2536 #endif
2537 default:
2538 ret = LTTCOMM_UND;
2539 goto error;
2540 }
2541
2542 ret = LTTCOMM_OK;
2543
2544 error:
2545 return ret;
2546 }
2547
2548 /*
2549 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2550 */
2551 static int cmd_enable_event(struct ltt_session *session, int domain,
2552 char *channel_name, struct lttng_event *event)
2553 {
2554 int ret;
2555 struct lttng_channel *attr;
2556 struct ltt_ust_session *usess = session->ust_session;
2557
2558 switch (domain) {
2559 case LTTNG_DOMAIN_KERNEL:
2560 {
2561 struct ltt_kernel_channel *kchan;
2562
2563 kchan = trace_kernel_get_channel_by_name(channel_name,
2564 session->kernel_session);
2565 if (kchan == NULL) {
2566 attr = channel_new_default_attr(domain);
2567 if (attr == NULL) {
2568 ret = LTTCOMM_FATAL;
2569 goto error;
2570 }
2571 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2572
2573 /* This call will notify the kernel thread */
2574 ret = channel_kernel_create(session->kernel_session,
2575 attr, kernel_poll_pipe[1]);
2576 if (ret != LTTCOMM_OK) {
2577 free(attr);
2578 goto error;
2579 }
2580 free(attr);
2581 }
2582
2583 /* Get the newly created kernel channel pointer */
2584 kchan = trace_kernel_get_channel_by_name(channel_name,
2585 session->kernel_session);
2586 if (kchan == NULL) {
2587 /* This sould not happen... */
2588 ret = LTTCOMM_FATAL;
2589 goto error;
2590 }
2591
2592 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2593 event);
2594 if (ret != LTTCOMM_OK) {
2595 goto error;
2596 }
2597
2598 kernel_wait_quiescent(kernel_tracer_fd);
2599 break;
2600 }
2601 case LTTNG_DOMAIN_UST:
2602 {
2603 struct lttng_channel *attr;
2604 struct ltt_ust_channel *uchan;
2605
2606 /* Get channel from global UST domain */
2607 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2608 channel_name);
2609 if (uchan == NULL) {
2610 /* Create default channel */
2611 attr = channel_new_default_attr(domain);
2612 if (attr == NULL) {
2613 ret = LTTCOMM_FATAL;
2614 goto error;
2615 }
2616 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2617 attr->name[NAME_MAX - 1] = '\0';
2618
2619 ret = channel_ust_create(usess, domain, attr);
2620 if (ret != LTTCOMM_OK) {
2621 free(attr);
2622 goto error;
2623 }
2624 free(attr);
2625
2626 /* Get the newly created channel reference back */
2627 uchan = trace_ust_find_channel_by_name(
2628 usess->domain_global.channels, channel_name);
2629 if (uchan == NULL) {
2630 /* Something is really wrong */
2631 ret = LTTCOMM_FATAL;
2632 goto error;
2633 }
2634 }
2635
2636 /* At this point, the session and channel exist on the tracer */
2637 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2638 if (ret != LTTCOMM_OK) {
2639 goto error;
2640 }
2641 break;
2642 }
2643 #if 0
2644 case LTTNG_DOMAIN_UST_EXEC_NAME:
2645 case LTTNG_DOMAIN_UST_PID:
2646 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2647 #endif
2648 default:
2649 ret = LTTCOMM_UND;
2650 goto error;
2651 }
2652
2653 ret = LTTCOMM_OK;
2654
2655 error:
2656 return ret;
2657 }
2658
2659 /*
2660 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2661 */
2662 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2663 char *channel_name, int event_type)
2664 {
2665 int ret;
2666 struct ltt_kernel_channel *kchan;
2667
2668 switch (domain) {
2669 case LTTNG_DOMAIN_KERNEL:
2670 kchan = trace_kernel_get_channel_by_name(channel_name,
2671 session->kernel_session);
2672 if (kchan == NULL) {
2673 /* This call will notify the kernel thread */
2674 ret = channel_kernel_create(session->kernel_session, NULL,
2675 kernel_poll_pipe[1]);
2676 if (ret != LTTCOMM_OK) {
2677 goto error;
2678 }
2679
2680 /* Get the newly created kernel channel pointer */
2681 kchan = trace_kernel_get_channel_by_name(channel_name,
2682 session->kernel_session);
2683 if (kchan == NULL) {
2684 /* This sould not happen... */
2685 ret = LTTCOMM_FATAL;
2686 goto error;
2687 }
2688
2689 }
2690
2691 switch (event_type) {
2692 case LTTNG_EVENT_SYSCALL:
2693 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2694 kchan, kernel_tracer_fd);
2695 break;
2696 case LTTNG_EVENT_TRACEPOINT:
2697 /*
2698 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2699 * events already registered to the channel.
2700 */
2701 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2702 kchan, kernel_tracer_fd);
2703 break;
2704 case LTTNG_EVENT_ALL:
2705 /* Enable syscalls and tracepoints */
2706 ret = event_kernel_enable_all(session->kernel_session,
2707 kchan, kernel_tracer_fd);
2708 break;
2709 default:
2710 ret = LTTCOMM_KERN_ENABLE_FAIL;
2711 goto error;
2712 }
2713
2714 /* Manage return value */
2715 if (ret != LTTCOMM_OK) {
2716 goto error;
2717 }
2718
2719 kernel_wait_quiescent(kernel_tracer_fd);
2720 break;
2721 case LTTNG_DOMAIN_UST:
2722 {
2723 struct lttng_channel *attr;
2724 struct ltt_ust_channel *uchan;
2725 struct ltt_ust_session *usess = session->ust_session;
2726
2727 /* Get channel from global UST domain */
2728 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2729 channel_name);
2730 if (uchan == NULL) {
2731 /* Create default channel */
2732 attr = channel_new_default_attr(domain);
2733 if (attr == NULL) {
2734 ret = LTTCOMM_FATAL;
2735 goto error;
2736 }
2737 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2738 attr->name[NAME_MAX - 1] = '\0';
2739
2740 /* Use the internal command enable channel */
2741 ret = channel_ust_create(usess, domain, attr);
2742 if (ret != LTTCOMM_OK) {
2743 free(attr);
2744 goto error;
2745 }
2746 free(attr);
2747
2748 /* Get the newly created channel reference back */
2749 uchan = trace_ust_find_channel_by_name(
2750 usess->domain_global.channels, channel_name);
2751 if (uchan == NULL) {
2752 /* Something is really wrong */
2753 ret = LTTCOMM_FATAL;
2754 goto error;
2755 }
2756 }
2757
2758 /* At this point, the session and channel exist on the tracer */
2759
2760 switch (event_type) {
2761 case LTTNG_EVENT_ALL:
2762 case LTTNG_EVENT_TRACEPOINT:
2763 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2764 if (ret != LTTCOMM_OK) {
2765 goto error;
2766 }
2767 break;
2768 default:
2769 ret = LTTCOMM_UST_ENABLE_FAIL;
2770 goto error;
2771 }
2772
2773 /* Manage return value */
2774 if (ret != LTTCOMM_OK) {
2775 goto error;
2776 }
2777
2778 break;
2779 }
2780 #if 0
2781 case LTTNG_DOMAIN_UST_EXEC_NAME:
2782 case LTTNG_DOMAIN_UST_PID:
2783 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2784 #endif
2785 default:
2786 ret = LTTCOMM_UND;
2787 goto error;
2788 }
2789
2790 ret = LTTCOMM_OK;
2791
2792 error:
2793 return ret;
2794 }
2795
2796 /*
2797 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2798 */
2799 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2800 {
2801 int ret;
2802 ssize_t nb_events = 0;
2803
2804 switch (domain) {
2805 case LTTNG_DOMAIN_KERNEL:
2806 nb_events = kernel_list_events(kernel_tracer_fd, events);
2807 if (nb_events < 0) {
2808 ret = LTTCOMM_KERN_LIST_FAIL;
2809 goto error;
2810 }
2811 break;
2812 case LTTNG_DOMAIN_UST:
2813 nb_events = ust_app_list_events(events);
2814 if (nb_events < 0) {
2815 ret = LTTCOMM_UST_LIST_FAIL;
2816 goto error;
2817 }
2818 break;
2819 default:
2820 ret = LTTCOMM_UND;
2821 goto error;
2822 }
2823
2824 return nb_events;
2825
2826 error:
2827 /* Return negative value to differentiate return code */
2828 return -ret;
2829 }
2830
2831 /*
2832 * Command LTTNG_START_TRACE processed by the client thread.
2833 */
2834 static int cmd_start_trace(struct ltt_session *session)
2835 {
2836 int ret;
2837 struct ltt_kernel_session *ksession;
2838 struct ltt_ust_session *usess;
2839
2840 /* Short cut */
2841 ksession = session->kernel_session;
2842 usess = session->ust_session;
2843
2844 if (session->enabled) {
2845 ret = LTTCOMM_UST_START_FAIL;
2846 goto error;
2847 }
2848
2849 session->enabled = 1;
2850
2851 /* Kernel tracing */
2852 if (ksession != NULL) {
2853 struct ltt_kernel_channel *kchan;
2854
2855 /* Open kernel metadata */
2856 if (ksession->metadata == NULL) {
2857 ret = kernel_open_metadata(ksession, ksession->trace_path);
2858 if (ret < 0) {
2859 ret = LTTCOMM_KERN_META_FAIL;
2860 goto error;
2861 }
2862 }
2863
2864 /* Open kernel metadata stream */
2865 if (ksession->metadata_stream_fd < 0) {
2866 ret = kernel_open_metadata_stream(ksession);
2867 if (ret < 0) {
2868 ERR("Kernel create metadata stream failed");
2869 ret = LTTCOMM_KERN_STREAM_FAIL;
2870 goto error;
2871 }
2872 }
2873
2874 /* For each channel */
2875 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2876 if (kchan->stream_count == 0) {
2877 ret = kernel_open_channel_stream(kchan);
2878 if (ret < 0) {
2879 ret = LTTCOMM_KERN_STREAM_FAIL;
2880 goto error;
2881 }
2882 /* Update the stream global counter */
2883 ksession->stream_count_global += ret;
2884 }
2885 }
2886
2887 /* Setup kernel consumer socket and send fds to it */
2888 ret = init_kernel_tracing(ksession);
2889 if (ret < 0) {
2890 ret = LTTCOMM_KERN_START_FAIL;
2891 goto error;
2892 }
2893
2894 /* This start the kernel tracing */
2895 ret = kernel_start_session(ksession);
2896 if (ret < 0) {
2897 ret = LTTCOMM_KERN_START_FAIL;
2898 goto error;
2899 }
2900
2901 /* Quiescent wait after starting trace */
2902 kernel_wait_quiescent(kernel_tracer_fd);
2903 }
2904
2905 /* Flag session that trace should start automatically */
2906 if (usess) {
2907 usess->start_trace = 1;
2908
2909 ret = ust_app_start_trace_all(usess);
2910 if (ret < 0) {
2911 ret = LTTCOMM_UST_START_FAIL;
2912 goto error;
2913 }
2914 }
2915
2916 ret = LTTCOMM_OK;
2917
2918 error:
2919 return ret;
2920 }
2921
2922 /*
2923 * Command LTTNG_STOP_TRACE processed by the client thread.
2924 */
2925 static int cmd_stop_trace(struct ltt_session *session)
2926 {
2927 int ret;
2928 struct ltt_kernel_channel *kchan;
2929 struct ltt_kernel_session *ksession;
2930 struct ltt_ust_session *usess;
2931
2932 /* Short cut */
2933 ksession = session->kernel_session;
2934 usess = session->ust_session;
2935
2936 if (!session->enabled) {
2937 ret = LTTCOMM_UST_STOP_FAIL;
2938 goto error;
2939 }
2940
2941 session->enabled = 0;
2942
2943 /* Kernel tracer */
2944 if (ksession != NULL) {
2945 DBG("Stop kernel tracing");
2946
2947 /* Flush all buffers before stopping */
2948 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2949 if (ret < 0) {
2950 ERR("Kernel metadata flush failed");
2951 }
2952
2953 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2954 ret = kernel_flush_buffer(kchan);
2955 if (ret < 0) {
2956 ERR("Kernel flush buffer error");
2957 }
2958 }
2959
2960 ret = kernel_stop_session(ksession);
2961 if (ret < 0) {
2962 ret = LTTCOMM_KERN_STOP_FAIL;
2963 goto error;
2964 }
2965
2966 kernel_wait_quiescent(kernel_tracer_fd);
2967 }
2968
2969 if (usess) {
2970 usess->start_trace = 0;
2971
2972 ret = ust_app_stop_trace_all(usess);
2973 if (ret < 0) {
2974 ret = LTTCOMM_UST_STOP_FAIL;
2975 goto error;
2976 }
2977 }
2978
2979 ret = LTTCOMM_OK;
2980
2981 error:
2982 return ret;
2983 }
2984
2985 /*
2986 * Command LTTNG_CREATE_SESSION processed by the client thread.
2987 */
2988 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2989 {
2990 int ret;
2991
2992 ret = session_create(name, path, creds->uid, creds->gid);
2993 if (ret != LTTCOMM_OK) {
2994 goto error;
2995 }
2996
2997 ret = LTTCOMM_OK;
2998
2999 error:
3000 return ret;
3001 }
3002
3003 /*
3004 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3005 */
3006 static int cmd_destroy_session(struct ltt_session *session, char *name)
3007 {
3008 int ret;
3009
3010 /* Clean kernel session teardown */
3011 teardown_kernel_session(session);
3012 /* UST session teardown */
3013 teardown_ust_session(session);
3014
3015 /*
3016 * Must notify the kernel thread here to update it's poll setin order
3017 * to remove the channel(s)' fd just destroyed.
3018 */
3019 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3020 if (ret < 0) {
3021 PERROR("write kernel poll pipe");
3022 }
3023
3024 ret = session_destroy(session);
3025
3026 return ret;
3027 }
3028
3029 /*
3030 * Command LTTNG_CALIBRATE processed by the client thread.
3031 */
3032 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3033 {
3034 int ret;
3035
3036 switch (domain) {
3037 case LTTNG_DOMAIN_KERNEL:
3038 {
3039 struct lttng_kernel_calibrate kcalibrate;
3040
3041 kcalibrate.type = calibrate->type;
3042 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
3043 if (ret < 0) {
3044 ret = LTTCOMM_KERN_ENABLE_FAIL;
3045 goto error;
3046 }
3047 break;
3048 }
3049 case LTTNG_DOMAIN_UST:
3050 {
3051 struct lttng_ust_calibrate ucalibrate;
3052
3053 ucalibrate.type = calibrate->type;
3054 ret = ust_app_calibrate_glb(&ucalibrate);
3055 if (ret < 0) {
3056 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3057 goto error;
3058 }
3059 break;
3060 }
3061 default:
3062 ret = LTTCOMM_UND;
3063 goto error;
3064 }
3065
3066 ret = LTTCOMM_OK;
3067
3068 error:
3069 return ret;
3070 }
3071
3072 /*
3073 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3074 */
3075 static int cmd_register_consumer(struct ltt_session *session, int domain,
3076 char *sock_path)
3077 {
3078 int ret, sock;
3079
3080 switch (domain) {
3081 case LTTNG_DOMAIN_KERNEL:
3082 /* Can't register a consumer if there is already one */
3083 if (session->kernel_session->consumer_fds_sent != 0) {
3084 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3085 goto error;
3086 }
3087
3088 sock = lttcomm_connect_unix_sock(sock_path);
3089 if (sock < 0) {
3090 ret = LTTCOMM_CONNECT_FAIL;
3091 goto error;
3092 }
3093
3094 session->kernel_session->consumer_fd = sock;
3095 break;
3096 default:
3097 /* TODO: Userspace tracing */
3098 ret = LTTCOMM_UND;
3099 goto error;
3100 }
3101
3102 ret = LTTCOMM_OK;
3103
3104 error:
3105 return ret;
3106 }
3107
3108 /*
3109 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3110 */
3111 static ssize_t cmd_list_domains(struct ltt_session *session,
3112 struct lttng_domain **domains)
3113 {
3114 int ret, index = 0;
3115 ssize_t nb_dom = 0;
3116
3117 if (session->kernel_session != NULL) {
3118 DBG3("Listing domains found kernel domain");
3119 nb_dom++;
3120 }
3121
3122 if (session->ust_session != NULL) {
3123 DBG3("Listing domains found UST global domain");
3124 nb_dom++;
3125 }
3126
3127 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3128 if (*domains == NULL) {
3129 ret = -LTTCOMM_FATAL;
3130 goto error;
3131 }
3132
3133 if (session->kernel_session != NULL) {
3134 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3135 index++;
3136 }
3137
3138 if (session->ust_session != NULL) {
3139 (*domains)[index].type = LTTNG_DOMAIN_UST;
3140 index++;
3141 }
3142
3143 return nb_dom;
3144
3145 error:
3146 return ret;
3147 }
3148
3149 /*
3150 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3151 */
3152 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3153 struct lttng_channel **channels)
3154 {
3155 int ret;
3156 ssize_t nb_chan = 0;
3157
3158 switch (domain) {
3159 case LTTNG_DOMAIN_KERNEL:
3160 if (session->kernel_session != NULL) {
3161 nb_chan = session->kernel_session->channel_count;
3162 }
3163 DBG3("Number of kernel channels %zd", nb_chan);
3164 break;
3165 case LTTNG_DOMAIN_UST:
3166 if (session->ust_session != NULL) {
3167 nb_chan = lttng_ht_get_count(
3168 session->ust_session->domain_global.channels);
3169 }
3170 DBG3("Number of UST global channels %zd", nb_chan);
3171 break;
3172 default:
3173 *channels = NULL;
3174 ret = -LTTCOMM_UND;
3175 goto error;
3176 }
3177
3178 if (nb_chan > 0) {
3179 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3180 if (*channels == NULL) {
3181 ret = -LTTCOMM_FATAL;
3182 goto error;
3183 }
3184
3185 list_lttng_channels(domain, session, *channels);
3186 } else {
3187 *channels = NULL;
3188 }
3189
3190 return nb_chan;
3191
3192 error:
3193 return ret;
3194 }
3195
3196 /*
3197 * Command LTTNG_LIST_EVENTS processed by the client thread.
3198 */
3199 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3200 char *channel_name, struct lttng_event **events)
3201 {
3202 int ret = 0;
3203 ssize_t nb_event = 0;
3204
3205 switch (domain) {
3206 case LTTNG_DOMAIN_KERNEL:
3207 if (session->kernel_session != NULL) {
3208 nb_event = list_lttng_kernel_events(channel_name,
3209 session->kernel_session, events);
3210 }
3211 break;
3212 case LTTNG_DOMAIN_UST:
3213 {
3214 if (session->ust_session != NULL) {
3215 nb_event = list_lttng_ust_global_events(channel_name,
3216 &session->ust_session->domain_global, events);
3217 }
3218 break;
3219 }
3220 default:
3221 ret = -LTTCOMM_UND;
3222 goto error;
3223 }
3224
3225 ret = nb_event;
3226
3227 error:
3228 return ret;
3229 }
3230
3231 /*
3232 * Process the command requested by the lttng client within the command
3233 * context structure. This function make sure that the return structure (llm)
3234 * is set and ready for transmission before returning.
3235 *
3236 * Return any error encountered or 0 for success.
3237 */
3238 static int process_client_msg(struct command_ctx *cmd_ctx)
3239 {
3240 int ret = LTTCOMM_OK;
3241 int need_tracing_session = 1;
3242 int need_domain;
3243
3244 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3245
3246 switch (cmd_ctx->lsm->cmd_type) {
3247 case LTTNG_CREATE_SESSION:
3248 case LTTNG_DESTROY_SESSION:
3249 case LTTNG_LIST_SESSIONS:
3250 case LTTNG_LIST_DOMAINS:
3251 case LTTNG_START_TRACE:
3252 case LTTNG_STOP_TRACE:
3253 need_domain = 0;
3254 break;
3255 default:
3256 need_domain = 1;
3257 }
3258
3259 if (opt_no_kernel && need_domain
3260 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3261 if (!is_root) {
3262 ret = LTTCOMM_NEED_ROOT_SESSIOND;
3263 } else {
3264 ret = LTTCOMM_KERN_NA;
3265 }
3266 goto error;
3267 }
3268
3269 /*
3270 * Check for command that don't needs to allocate a returned payload. We do
3271 * this here so we don't have to make the call for no payload at each
3272 * command.
3273 */
3274 switch(cmd_ctx->lsm->cmd_type) {
3275 case LTTNG_LIST_SESSIONS:
3276 case LTTNG_LIST_TRACEPOINTS:
3277 case LTTNG_LIST_DOMAINS:
3278 case LTTNG_LIST_CHANNELS:
3279 case LTTNG_LIST_EVENTS:
3280 break;
3281 default:
3282 /* Setup lttng message with no payload */
3283 ret = setup_lttng_msg(cmd_ctx, 0);
3284 if (ret < 0) {
3285 /* This label does not try to unlock the session */
3286 goto init_setup_error;
3287 }
3288 }
3289
3290 /* Commands that DO NOT need a session. */
3291 switch (cmd_ctx->lsm->cmd_type) {
3292 case LTTNG_CREATE_SESSION:
3293 case LTTNG_CALIBRATE:
3294 case LTTNG_LIST_SESSIONS:
3295 case LTTNG_LIST_TRACEPOINTS:
3296 need_tracing_session = 0;
3297 break;
3298 default:
3299 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3300 session_lock_list();
3301 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3302 session_unlock_list();
3303 if (cmd_ctx->session == NULL) {
3304 if (cmd_ctx->lsm->session.name != NULL) {
3305 ret = LTTCOMM_SESS_NOT_FOUND;
3306 } else {
3307 /* If no session name specified */
3308 ret = LTTCOMM_SELECT_SESS;
3309 }
3310 goto error;
3311 } else {
3312 /* Acquire lock for the session */
3313 session_lock(cmd_ctx->session);
3314 }
3315 break;
3316 }
3317
3318 if (!need_domain) {
3319 goto skip_domain;
3320 }
3321 /*
3322 * Check domain type for specific "pre-action".
3323 */
3324 switch (cmd_ctx->lsm->domain.type) {
3325 case LTTNG_DOMAIN_KERNEL:
3326 if (!is_root) {
3327 ret = LTTCOMM_NEED_ROOT_SESSIOND;
3328 goto error;
3329 }
3330
3331 /* Kernel tracer check */
3332 if (kernel_tracer_fd == -1) {
3333 /* Basically, load kernel tracer modules */
3334 ret = init_kernel_tracer();
3335 if (ret != 0) {
3336 goto error;
3337 }
3338 }
3339
3340 /* Need a session for kernel command */
3341 if (need_tracing_session) {
3342 if (cmd_ctx->session->kernel_session == NULL) {
3343 ret = create_kernel_session(cmd_ctx->session);
3344 if (ret < 0) {
3345 ret = LTTCOMM_KERN_SESS_FAIL;
3346 goto error;
3347 }
3348 }
3349
3350 /* Start the kernel consumer daemon */
3351 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3352 if (kconsumer_data.pid == 0 &&
3353 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3354 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3355 ret = start_consumerd(&kconsumer_data);
3356 if (ret < 0) {
3357 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3358 goto error;
3359 }
3360 } else {
3361 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3362 }
3363 }
3364 break;
3365 case LTTNG_DOMAIN_UST:
3366 {
3367 if (need_tracing_session) {
3368 if (cmd_ctx->session->ust_session == NULL) {
3369 ret = create_ust_session(cmd_ctx->session,
3370 &cmd_ctx->lsm->domain);
3371 if (ret != LTTCOMM_OK) {
3372 goto error;
3373 }
3374 }
3375 /* Start the UST consumer daemons */
3376 /* 64-bit */
3377 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3378 if (consumerd64_bin[0] != '\0' &&
3379 ustconsumer64_data.pid == 0 &&
3380 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3381 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3382 ret = start_consumerd(&ustconsumer64_data);
3383 if (ret < 0) {
3384 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3385 ust_consumerd64_fd = -EINVAL;
3386 goto error;
3387 }
3388
3389 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3390 } else {
3391 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3392 }
3393 /* 32-bit */
3394 if (consumerd32_bin[0] != '\0' &&
3395 ustconsumer32_data.pid == 0 &&
3396 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3397 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3398 ret = start_consumerd(&ustconsumer32_data);
3399 if (ret < 0) {
3400 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3401 ust_consumerd32_fd = -EINVAL;
3402 goto error;
3403 }
3404 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3405 } else {
3406 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3407 }
3408 }
3409 break;
3410 }
3411 default:
3412 break;
3413 }
3414 skip_domain:
3415
3416 /*
3417 * Check that the UID or GID match that of the tracing session.
3418 * The root user can interact with all sessions.
3419 */
3420 if (need_tracing_session) {
3421 if (!session_access_ok(cmd_ctx->session,
3422 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3423 ret = LTTCOMM_EPERM;
3424 goto error;
3425 }
3426 }
3427
3428 /* Process by command type */
3429 switch (cmd_ctx->lsm->cmd_type) {
3430 case LTTNG_ADD_CONTEXT:
3431 {
3432 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3433 cmd_ctx->lsm->u.context.channel_name,
3434 cmd_ctx->lsm->u.context.event_name,
3435 &cmd_ctx->lsm->u.context.ctx);
3436 break;
3437 }
3438 case LTTNG_DISABLE_CHANNEL:
3439 {
3440 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3441 cmd_ctx->lsm->u.disable.channel_name);
3442 break;
3443 }
3444 case LTTNG_DISABLE_EVENT:
3445 {
3446 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3447 cmd_ctx->lsm->u.disable.channel_name,
3448 cmd_ctx->lsm->u.disable.name);
3449 break;
3450 }
3451 case LTTNG_DISABLE_ALL_EVENT:
3452 {
3453 DBG("Disabling all events");
3454
3455 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3456 cmd_ctx->lsm->u.disable.channel_name);
3457 break;
3458 }
3459 case LTTNG_ENABLE_CHANNEL:
3460 {
3461 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3462 &cmd_ctx->lsm->u.channel.chan);
3463 break;
3464 }
3465 case LTTNG_ENABLE_EVENT:
3466 {
3467 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3468 cmd_ctx->lsm->u.enable.channel_name,
3469 &cmd_ctx->lsm->u.enable.event);
3470 break;
3471 }
3472 case LTTNG_ENABLE_ALL_EVENT:
3473 {
3474 DBG("Enabling all events");
3475
3476 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3477 cmd_ctx->lsm->u.enable.channel_name,
3478 cmd_ctx->lsm->u.enable.event.type);
3479 break;
3480 }
3481 case LTTNG_LIST_TRACEPOINTS:
3482 {
3483 struct lttng_event *events;
3484 ssize_t nb_events;
3485
3486 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3487 if (nb_events < 0) {
3488 ret = -nb_events;
3489 goto error;
3490 }
3491
3492 /*
3493 * Setup lttng message with payload size set to the event list size in
3494 * bytes and then copy list into the llm payload.
3495 */
3496 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3497 if (ret < 0) {
3498 free(events);
3499 goto setup_error;
3500 }
3501
3502 /* Copy event list into message payload */
3503 memcpy(cmd_ctx->llm->payload, events,
3504 sizeof(struct lttng_event) * nb_events);
3505
3506 free(events);
3507
3508 ret = LTTCOMM_OK;
3509 break;
3510 }
3511 case LTTNG_START_TRACE:
3512 {
3513 ret = cmd_start_trace(cmd_ctx->session);
3514 break;
3515 }
3516 case LTTNG_STOP_TRACE:
3517 {
3518 ret = cmd_stop_trace(cmd_ctx->session);
3519 break;
3520 }
3521 case LTTNG_CREATE_SESSION:
3522 {
3523 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3524 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3525 break;
3526 }
3527 case LTTNG_DESTROY_SESSION:
3528 {
3529 ret = cmd_destroy_session(cmd_ctx->session,
3530 cmd_ctx->lsm->session.name);
3531 break;
3532 }
3533 case LTTNG_LIST_DOMAINS:
3534 {
3535 ssize_t nb_dom;
3536 struct lttng_domain *domains;
3537
3538 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3539 if (nb_dom < 0) {
3540 ret = -nb_dom;
3541 goto error;
3542 }
3543
3544 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3545 if (ret < 0) {
3546 goto setup_error;
3547 }
3548
3549 /* Copy event list into message payload */
3550 memcpy(cmd_ctx->llm->payload, domains,
3551 nb_dom * sizeof(struct lttng_domain));
3552
3553 free(domains);
3554
3555 ret = LTTCOMM_OK;
3556 break;
3557 }
3558 case LTTNG_LIST_CHANNELS:
3559 {
3560 size_t nb_chan;
3561 struct lttng_channel *channels;
3562
3563 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3564 cmd_ctx->session, &channels);
3565 if (nb_chan < 0) {
3566 ret = -nb_chan;
3567 goto error;
3568 }
3569
3570 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3571 if (ret < 0) {
3572 goto setup_error;
3573 }
3574
3575 /* Copy event list into message payload */
3576 memcpy(cmd_ctx->llm->payload, channels,
3577 nb_chan * sizeof(struct lttng_channel));
3578
3579 free(channels);
3580
3581 ret = LTTCOMM_OK;
3582 break;
3583 }
3584 case LTTNG_LIST_EVENTS:
3585 {
3586 ssize_t nb_event;
3587 struct lttng_event *events = NULL;
3588
3589 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3590 cmd_ctx->lsm->u.list.channel_name, &events);
3591 if (nb_event < 0) {
3592 ret = -nb_event;
3593 goto error;
3594 }
3595
3596 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3597 if (ret < 0) {
3598 goto setup_error;
3599 }
3600
3601 /* Copy event list into message payload */
3602 memcpy(cmd_ctx->llm->payload, events,
3603 nb_event * sizeof(struct lttng_event));
3604
3605 free(events);
3606
3607 ret = LTTCOMM_OK;
3608 break;
3609 }
3610 case LTTNG_LIST_SESSIONS:
3611 {
3612 unsigned int nr_sessions;
3613
3614 session_lock_list();
3615 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3616
3617 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3618 if (ret < 0) {
3619 session_unlock_list();
3620 goto setup_error;
3621 }
3622
3623 /* Filled the session array */
3624 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3625 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3626
3627 session_unlock_list();
3628
3629 ret = LTTCOMM_OK;
3630 break;
3631 }
3632 case LTTNG_CALIBRATE:
3633 {
3634 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3635 &cmd_ctx->lsm->u.calibrate);
3636 break;
3637 }
3638 case LTTNG_REGISTER_CONSUMER:
3639 {
3640 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3641 cmd_ctx->lsm->u.reg.path);
3642 break;
3643 }
3644 default:
3645 ret = LTTCOMM_UND;
3646 break;
3647 }
3648
3649 error:
3650 if (cmd_ctx->llm == NULL) {
3651 DBG("Missing llm structure. Allocating one.");
3652 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3653 goto setup_error;
3654 }
3655 }
3656 /* Set return code */
3657 cmd_ctx->llm->ret_code = ret;
3658 setup_error:
3659 if (cmd_ctx->session) {
3660 session_unlock(cmd_ctx->session);
3661 }
3662 init_setup_error:
3663 return ret;
3664 }
3665
3666 /*
3667 * This thread manage all clients request using the unix client socket for
3668 * communication.
3669 */
3670 static void *thread_manage_clients(void *data)
3671 {
3672 int sock = -1, ret, i, pollfd;
3673 uint32_t revents, nb_fd;
3674 struct command_ctx *cmd_ctx = NULL;
3675 struct lttng_poll_event events;
3676
3677 DBG("[thread] Manage client started");
3678
3679 rcu_register_thread();
3680
3681 ret = lttcomm_listen_unix_sock(client_sock);
3682 if (ret < 0) {
3683 goto error;
3684 }
3685
3686 /*
3687 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3688 * more will be added to this poll set.
3689 */
3690 ret = create_thread_poll_set(&events, 2);
3691 if (ret < 0) {
3692 goto error;
3693 }
3694
3695 /* Add the application registration socket */
3696 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3697 if (ret < 0) {
3698 goto error;
3699 }
3700
3701 /*
3702 * Notify parent pid that we are ready to accept command for client side.
3703 */
3704 if (opt_sig_parent) {
3705 kill(ppid, SIGUSR1);
3706 }
3707
3708 while (1) {
3709 DBG("Accepting client command ...");
3710
3711 nb_fd = LTTNG_POLL_GETNB(&events);
3712
3713 /* Inifinite blocking call, waiting for transmission */
3714 restart:
3715 ret = lttng_poll_wait(&events, -1);
3716 if (ret < 0) {
3717 /*
3718 * Restart interrupted system call.
3719 */
3720 if (errno == EINTR) {
3721 goto restart;
3722 }
3723 goto error;
3724 }
3725
3726 for (i = 0; i < nb_fd; i++) {
3727 /* Fetch once the poll data */
3728 revents = LTTNG_POLL_GETEV(&events, i);
3729 pollfd = LTTNG_POLL_GETFD(&events, i);
3730
3731 /* Thread quit pipe has been closed. Killing thread. */
3732 ret = check_thread_quit_pipe(pollfd, revents);
3733 if (ret) {
3734 goto error;
3735 }
3736
3737 /* Event on the registration socket */
3738 if (pollfd == client_sock) {
3739 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3740 ERR("Client socket poll error");
3741 goto error;
3742 }
3743 }
3744 }
3745
3746 DBG("Wait for client response");
3747
3748 sock = lttcomm_accept_unix_sock(client_sock);
3749 if (sock < 0) {
3750 goto error;
3751 }
3752
3753 /* Set socket option for credentials retrieval */
3754 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3755 if (ret < 0) {
3756 goto error;
3757 }
3758
3759 /* Allocate context command to process the client request */
3760 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3761 if (cmd_ctx == NULL) {
3762 PERROR("zmalloc cmd_ctx");
3763 goto error;
3764 }
3765
3766 /* Allocate data buffer for reception */
3767 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3768 if (cmd_ctx->lsm == NULL) {
3769 PERROR("zmalloc cmd_ctx->lsm");
3770 goto error;
3771 }
3772
3773 cmd_ctx->llm = NULL;
3774 cmd_ctx->session = NULL;
3775
3776 /*
3777 * Data is received from the lttng client. The struct
3778 * lttcomm_session_msg (lsm) contains the command and data request of
3779 * the client.
3780 */
3781 DBG("Receiving data from client ...");
3782 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3783 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3784 if (ret <= 0) {
3785 DBG("Nothing recv() from client... continuing");
3786 ret = close(sock);
3787 if (ret) {
3788 PERROR("close");
3789 }
3790 sock = -1;
3791 free(cmd_ctx);
3792 continue;
3793 }
3794
3795 // TODO: Validate cmd_ctx including sanity check for
3796 // security purpose.
3797
3798 rcu_thread_online();
3799 /*
3800 * This function dispatch the work to the kernel or userspace tracer
3801 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3802 * informations for the client. The command context struct contains
3803 * everything this function may needs.
3804 */
3805 ret = process_client_msg(cmd_ctx);
3806 rcu_thread_offline();
3807 if (ret < 0) {
3808 /*
3809 * TODO: Inform client somehow of the fatal error. At
3810 * this point, ret < 0 means that a zmalloc failed
3811 * (ENOMEM). Error detected but still accept command.
3812 */
3813 clean_command_ctx(&cmd_ctx);
3814 continue;
3815 }
3816
3817 DBG("Sending response (size: %d, retcode: %s)",
3818 cmd_ctx->lttng_msg_size,
3819 lttng_strerror(-cmd_ctx->llm->ret_code));
3820 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3821 if (ret < 0) {
3822 ERR("Failed to send data back to client");
3823 }
3824
3825 /* End of transmission */
3826 ret = close(sock);
3827 if (ret) {
3828 PERROR("close");
3829 }
3830 sock = -1;
3831
3832 clean_command_ctx(&cmd_ctx);
3833 }
3834
3835 error:
3836 DBG("Client thread dying");
3837 unlink(client_unix_sock_path);
3838 if (client_sock >= 0) {
3839 ret = close(client_sock);
3840 if (ret) {
3841 PERROR("close");
3842 }
3843 }
3844 if (sock >= 0) {
3845 ret = close(sock);
3846 if (ret) {
3847 PERROR("close");
3848 }
3849 }
3850
3851 lttng_poll_clean(&events);
3852 clean_command_ctx(&cmd_ctx);
3853
3854 rcu_unregister_thread();
3855 return NULL;
3856 }
3857
3858
3859 /*
3860 * usage function on stderr
3861 */
3862 static void usage(void)
3863 {
3864 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3865 fprintf(stderr, " -h, --help Display this usage.\n");
3866 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3867 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3868 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3869 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3870 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3871 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3872 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3873 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3874 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3875 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3876 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3877 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3878 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3879 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3880 fprintf(stderr, " -V, --version Show version number.\n");
3881 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3882 fprintf(stderr, " -q, --quiet No output at all.\n");
3883 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3884 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3885 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3886 }
3887
3888 /*
3889 * daemon argument parsing
3890 */
3891 static int parse_args(int argc, char **argv)
3892 {
3893 int c;
3894
3895 static struct option long_options[] = {
3896 { "client-sock", 1, 0, 'c' },
3897 { "apps-sock", 1, 0, 'a' },
3898 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3899 { "kconsumerd-err-sock", 1, 0, 'E' },
3900 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3901 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3902 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3903 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3904 { "consumerd32-path", 1, 0, 'u' },
3905 { "consumerd32-libdir", 1, 0, 'U' },
3906 { "consumerd64-path", 1, 0, 't' },
3907 { "consumerd64-libdir", 1, 0, 'T' },
3908 { "daemonize", 0, 0, 'd' },
3909 { "sig-parent", 0, 0, 'S' },
3910 { "help", 0, 0, 'h' },
3911 { "group", 1, 0, 'g' },
3912 { "version", 0, 0, 'V' },
3913 { "quiet", 0, 0, 'q' },
3914 { "verbose", 0, 0, 'v' },
3915 { "verbose-consumer", 0, 0, 'Z' },
3916 { "no-kernel", 0, 0, 'N' },
3917 { NULL, 0, 0, 0 }
3918 };
3919
3920 while (1) {
3921 int option_index = 0;
3922 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3923 long_options, &option_index);
3924 if (c == -1) {
3925 break;
3926 }
3927
3928 switch (c) {
3929 case 0:
3930 fprintf(stderr, "option %s", long_options[option_index].name);
3931 if (optarg) {
3932 fprintf(stderr, " with arg %s\n", optarg);
3933 }
3934 break;
3935 case 'c':
3936 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3937 break;
3938 case 'a':
3939 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3940 break;
3941 case 'd':
3942 opt_daemon = 1;
3943 break;
3944 case 'g':
3945 opt_tracing_group = optarg;
3946 break;
3947 case 'h':
3948 usage();
3949 exit(EXIT_FAILURE);
3950 case 'V':
3951 fprintf(stdout, "%s\n", VERSION);
3952 exit(EXIT_SUCCESS);
3953 case 'S':
3954 opt_sig_parent = 1;
3955 break;
3956 case 'E':
3957 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3958 break;
3959 case 'C':
3960 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3961 break;
3962 case 'F':
3963 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3964 break;
3965 case 'D':
3966 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3967 break;
3968 case 'H':
3969 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3970 break;
3971 case 'G':
3972 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3973 break;
3974 case 'N':
3975 opt_no_kernel = 1;
3976 break;
3977 case 'q':
3978 opt_quiet = 1;
3979 break;
3980 case 'v':
3981 /* Verbose level can increase using multiple -v */
3982 opt_verbose += 1;
3983 break;
3984 case 'Z':
3985 opt_verbose_consumer += 1;
3986 break;
3987 case 'u':
3988 consumerd32_bin= optarg;
3989 break;
3990 case 'U':
3991 consumerd32_libdir = optarg;
3992 break;
3993 case 't':
3994 consumerd64_bin = optarg;
3995 break;
3996 case 'T':
3997 consumerd64_libdir = optarg;
3998 break;
3999 default:
4000 /* Unknown option or other error.
4001 * Error is printed by getopt, just return */
4002 return -1;
4003 }
4004 }
4005
4006 return 0;
4007 }
4008
4009 /*
4010 * Creates the two needed socket by the daemon.
4011 * apps_sock - The communication socket for all UST apps.
4012 * client_sock - The communication of the cli tool (lttng).
4013 */
4014 static int init_daemon_socket(void)
4015 {
4016 int ret = 0;
4017 mode_t old_umask;
4018
4019 old_umask = umask(0);
4020
4021 /* Create client tool unix socket */
4022 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4023 if (client_sock < 0) {
4024 ERR("Create unix sock failed: %s", client_unix_sock_path);
4025 ret = -1;
4026 goto end;
4027 }
4028
4029 /* File permission MUST be 660 */
4030 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4031 if (ret < 0) {
4032 ERR("Set file permissions failed: %s", client_unix_sock_path);
4033 PERROR("chmod");
4034 goto end;
4035 }
4036
4037 /* Create the application unix socket */
4038 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4039 if (apps_sock < 0) {
4040 ERR("Create unix sock failed: %s", apps_unix_sock_path);
4041 ret = -1;
4042 goto end;
4043 }
4044
4045 /* File permission MUST be 666 */
4046 ret = chmod(apps_unix_sock_path,
4047 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
4048 if (ret < 0) {
4049 ERR("Set file permissions failed: %s", apps_unix_sock_path);
4050 PERROR("chmod");
4051 goto end;
4052 }
4053
4054 end:
4055 umask(old_umask);
4056 return ret;
4057 }
4058
4059 /*
4060 * Check if the global socket is available, and if a daemon is answering at the
4061 * other side. If yes, error is returned.
4062 */
4063 static int check_existing_daemon(void)
4064 {
4065 /* Is there anybody out there ? */
4066 if (lttng_session_daemon_alive()) {
4067 return -EEXIST;
4068 }
4069
4070 return 0;
4071 }
4072
4073 /*
4074 * Set the tracing group gid onto the client socket.
4075 *
4076 * Race window between mkdir and chown is OK because we are going from more
4077 * permissive (root.root) to less permissive (root.tracing).
4078 */
4079 static int set_permissions(char *rundir)
4080 {
4081 int ret;
4082 gid_t gid;
4083
4084 gid = allowed_group();
4085 if (gid < 0) {
4086 WARN("No tracing group detected");
4087 ret = 0;
4088 goto end;
4089 }
4090
4091 /* Set lttng run dir */
4092 ret = chown(rundir, 0, gid);
4093 if (ret < 0) {
4094 ERR("Unable to set group on %s", rundir);
4095 PERROR("chown");
4096 }
4097
4098 /* Ensure tracing group can search the run dir */
4099 ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
4100 if (ret < 0) {
4101 ERR("Unable to set permissions on %s", rundir);
4102 PERROR("chmod");
4103 }
4104
4105 /* lttng client socket path */
4106 ret = chown(client_unix_sock_path, 0, gid);
4107 if (ret < 0) {
4108 ERR("Unable to set group on %s", client_unix_sock_path);
4109 PERROR("chown");
4110 }
4111
4112 /* kconsumer error socket path */
4113 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4114 if (ret < 0) {
4115 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4116 PERROR("chown");
4117 }
4118
4119 /* 64-bit ustconsumer error socket path */
4120 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4121 if (ret < 0) {
4122 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4123 PERROR("chown");
4124 }
4125
4126 /* 32-bit ustconsumer compat32 error socket path */
4127 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4128 if (ret < 0) {
4129 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4130 PERROR("chown");
4131 }
4132
4133 DBG("All permissions are set");
4134
4135 end:
4136 return ret;
4137 }
4138
4139 /*
4140 * Create the pipe used to wake up the kernel thread.
4141 * Closed in cleanup().
4142 */
4143 static int create_kernel_poll_pipe(void)
4144 {
4145 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4146 }
4147
4148 /*
4149 * Create the application command pipe to wake thread_manage_apps.
4150 * Closed in cleanup().
4151 */
4152 static int create_apps_cmd_pipe(void)
4153 {
4154 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4155 }
4156
4157 /*
4158 * Create the lttng run directory needed for all global sockets and pipe.
4159 */
4160 static int create_lttng_rundir(const char *rundir)
4161 {
4162 int ret;
4163
4164 DBG3("Creating LTTng run directory: %s", rundir);
4165
4166 ret = mkdir(rundir, S_IRWXU);
4167 if (ret < 0) {
4168 if (errno != EEXIST) {
4169 ERR("Unable to create %s", rundir);
4170 goto error;
4171 } else {
4172 ret = 0;
4173 }
4174 }
4175
4176 error:
4177 return ret;
4178 }
4179
4180 /*
4181 * Setup sockets and directory needed by the kconsumerd communication with the
4182 * session daemon.
4183 */
4184 static int set_consumer_sockets(struct consumer_data *consumer_data,
4185 const char *rundir)
4186 {
4187 int ret;
4188 char path[PATH_MAX];
4189
4190 switch (consumer_data->type) {
4191 case LTTNG_CONSUMER_KERNEL:
4192 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4193 break;
4194 case LTTNG_CONSUMER64_UST:
4195 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4196 break;
4197 case LTTNG_CONSUMER32_UST:
4198 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4199 break;
4200 default:
4201 ERR("Consumer type unknown");
4202 ret = -EINVAL;
4203 goto error;
4204 }
4205
4206 DBG2("Creating consumer directory: %s", path);
4207
4208 ret = mkdir(path, S_IRWXU);
4209 if (ret < 0) {
4210 if (errno != EEXIST) {
4211 ERR("Failed to create %s", path);
4212 goto error;
4213 }
4214 ret = 0;
4215 }
4216
4217 /* Create the kconsumerd error unix socket */
4218 consumer_data->err_sock =
4219 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4220 if (consumer_data->err_sock < 0) {
4221 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4222 ret = -1;
4223 goto error;
4224 }
4225
4226 /* File permission MUST be 660 */
4227 ret = chmod(consumer_data->err_unix_sock_path,
4228 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4229 if (ret < 0) {
4230 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4231 PERROR("chmod");
4232 goto error;
4233 }
4234
4235 error:
4236 return ret;
4237 }
4238
4239 /*
4240 * Signal handler for the daemon
4241 *
4242 * Simply stop all worker threads, leaving main() return gracefully after
4243 * joining all threads and calling cleanup().
4244 */
4245 static void sighandler(int sig)
4246 {
4247 switch (sig) {
4248 case SIGPIPE:
4249 DBG("SIGPIPE caught");
4250 return;
4251 case SIGINT:
4252 DBG("SIGINT caught");
4253 stop_threads();
4254 break;
4255 case SIGTERM:
4256 DBG("SIGTERM caught");
4257 stop_threads();
4258 break;
4259 default:
4260 break;
4261 }
4262 }
4263
4264 /*
4265 * Setup signal handler for :
4266 * SIGINT, SIGTERM, SIGPIPE
4267 */
4268 static int set_signal_handler(void)
4269 {
4270 int ret = 0;
4271 struct sigaction sa;
4272 sigset_t sigset;
4273
4274 if ((ret = sigemptyset(&sigset)) < 0) {
4275 PERROR("sigemptyset");
4276 return ret;
4277 }
4278
4279 sa.sa_handler = sighandler;
4280 sa.sa_mask = sigset;
4281 sa.sa_flags = 0;
4282 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4283 PERROR("sigaction");
4284 return ret;
4285 }
4286
4287 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4288 PERROR("sigaction");
4289 return ret;
4290 }
4291
4292 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4293 PERROR("sigaction");
4294 return ret;
4295 }
4296
4297 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4298
4299 return ret;
4300 }
4301
4302 /*
4303 * Set open files limit to unlimited. This daemon can open a large number of
4304 * file descriptors in order to consumer multiple kernel traces.
4305 */
4306 static void set_ulimit(void)
4307 {
4308 int ret;
4309 struct rlimit lim;
4310
4311 /* The kernel does not allowed an infinite limit for open files */
4312 lim.rlim_cur = 65535;
4313 lim.rlim_max = 65535;
4314
4315 ret = setrlimit(RLIMIT_NOFILE, &lim);
4316 if (ret < 0) {
4317 PERROR("failed to set open files limit");
4318 }
4319 }
4320
4321 /*
4322 * main
4323 */
4324 int main(int argc, char **argv)
4325 {
4326 int ret = 0;
4327 void *status;
4328 const char *home_path;
4329
4330 init_kernel_workarounds();
4331
4332 rcu_register_thread();
4333
4334 /* Create thread quit pipe */
4335 if ((ret = init_thread_quit_pipe()) < 0) {
4336 goto error;
4337 }
4338
4339 setup_consumerd_path();
4340
4341 /* Parse arguments */
4342 progname = argv[0];
4343 if ((ret = parse_args(argc, argv) < 0)) {
4344 goto error;
4345 }
4346
4347 /* Daemonize */
4348 if (opt_daemon) {
4349 ret = daemon(0, 0);
4350 if (ret < 0) {
4351 PERROR("daemon");
4352 goto error;
4353 }
4354 }
4355
4356 /* Check if daemon is UID = 0 */
4357 is_root = !getuid();
4358
4359 if (is_root) {
4360 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4361
4362 /* Create global run dir with root access */
4363 ret = create_lttng_rundir(rundir);
4364 if (ret < 0) {
4365 goto error;
4366 }
4367
4368 if (strlen(apps_unix_sock_path) == 0) {
4369 snprintf(apps_unix_sock_path, PATH_MAX,
4370 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4371 }
4372
4373 if (strlen(client_unix_sock_path) == 0) {
4374 snprintf(client_unix_sock_path, PATH_MAX,
4375 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4376 }
4377
4378 /* Set global SHM for ust */
4379 if (strlen(wait_shm_path) == 0) {
4380 snprintf(wait_shm_path, PATH_MAX,
4381 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4382 }
4383
4384 /* Setup kernel consumerd path */
4385 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4386 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4387 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4388 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4389
4390 DBG2("Kernel consumer err path: %s",
4391 kconsumer_data.err_unix_sock_path);
4392 DBG2("Kernel consumer cmd path: %s",
4393 kconsumer_data.cmd_unix_sock_path);
4394 } else {
4395 home_path = get_home_dir();
4396 if (home_path == NULL) {
4397 /* TODO: Add --socket PATH option */
4398 ERR("Can't get HOME directory for sockets creation.");
4399 ret = -EPERM;
4400 goto error;
4401 }
4402
4403 /*
4404 * Create rundir from home path. This will create something like
4405 * $HOME/.lttng
4406 */
4407 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4408 if (ret < 0) {
4409 ret = -ENOMEM;
4410 goto error;
4411 }
4412
4413 ret = create_lttng_rundir(rundir);
4414 if (ret < 0) {
4415 goto error;
4416 }
4417
4418 if (strlen(apps_unix_sock_path) == 0) {
4419 snprintf(apps_unix_sock_path, PATH_MAX,
4420 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4421 }
4422
4423 /* Set the cli tool unix socket path */
4424 if (strlen(client_unix_sock_path) == 0) {
4425 snprintf(client_unix_sock_path, PATH_MAX,
4426 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4427 }
4428
4429 /* Set global SHM for ust */
4430 if (strlen(wait_shm_path) == 0) {
4431 snprintf(wait_shm_path, PATH_MAX,
4432 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4433 }
4434 }
4435
4436 DBG("Client socket path %s", client_unix_sock_path);
4437 DBG("Application socket path %s", apps_unix_sock_path);
4438 DBG("LTTng run directory path: %s", rundir);
4439
4440 /* 32 bits consumerd path setup */
4441 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4442 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4443 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4444 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4445
4446 DBG2("UST consumer 32 bits err path: %s",
4447 ustconsumer32_data.err_unix_sock_path);
4448 DBG2("UST consumer 32 bits cmd path: %s",
4449 ustconsumer32_data.cmd_unix_sock_path);
4450
4451 /* 64 bits consumerd path setup */
4452 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4453 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4454 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4455 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4456
4457 DBG2("UST consumer 64 bits err path: %s",
4458 ustconsumer64_data.err_unix_sock_path);
4459 DBG2("UST consumer 64 bits cmd path: %s",
4460 ustconsumer64_data.cmd_unix_sock_path);
4461
4462 /*
4463 * See if daemon already exist.
4464 */
4465 if ((ret = check_existing_daemon()) < 0) {
4466 ERR("Already running daemon.\n");
4467 /*
4468 * We do not goto exit because we must not cleanup()
4469 * because a daemon is already running.
4470 */
4471 goto error;
4472 }
4473
4474 /* After this point, we can safely call cleanup() with "goto exit" */
4475
4476 /*
4477 * These actions must be executed as root. We do that *after* setting up
4478 * the sockets path because we MUST make the check for another daemon using
4479 * those paths *before* trying to set the kernel consumer sockets and init
4480 * kernel tracer.
4481 */
4482 if (is_root) {
4483 ret = set_consumer_sockets(&kconsumer_data, rundir);
4484 if (ret < 0) {
4485 goto exit;
4486 }
4487
4488 /* Setup kernel tracer */
4489 if (!opt_no_kernel) {
4490 init_kernel_tracer();
4491 }
4492
4493 /* Set ulimit for open files */
4494 set_ulimit();
4495 }
4496
4497 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4498 if (ret < 0) {
4499 goto exit;
4500 }
4501
4502 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4503 if (ret < 0) {
4504 goto exit;
4505 }
4506
4507 if ((ret = set_signal_handler()) < 0) {
4508 goto exit;
4509 }
4510
4511 /* Setup the needed unix socket */
4512 if ((ret = init_daemon_socket()) < 0) {
4513 goto exit;
4514 }
4515
4516 /* Set credentials to socket */
4517 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4518 goto exit;
4519 }
4520
4521 /* Get parent pid if -S, --sig-parent is specified. */
4522 if (opt_sig_parent) {
4523 ppid = getppid();
4524 }
4525
4526 /* Setup the kernel pipe for waking up the kernel thread */
4527 if ((ret = create_kernel_poll_pipe()) < 0) {
4528 goto exit;
4529 }
4530
4531 /* Setup the thread apps communication pipe. */
4532 if ((ret = create_apps_cmd_pipe()) < 0) {
4533 goto exit;
4534 }
4535
4536 /* Init UST command queue. */
4537 cds_wfq_init(&ust_cmd_queue.queue);
4538
4539 /* Init UST app hash table */
4540 ust_app_ht_alloc();
4541
4542 /*
4543 * Get session list pointer. This pointer MUST NOT be free(). This list is
4544 * statically declared in session.c
4545 */
4546 session_list_ptr = session_get_list();
4547
4548 /* Set up max poll set size */
4549 lttng_poll_set_max_size();
4550
4551 /* Create thread to manage the client socket */
4552 ret = pthread_create(&client_thread, NULL,
4553 thread_manage_clients, (void *) NULL);
4554 if (ret != 0) {
4555 PERROR("pthread_create clients");
4556 goto exit_client;
4557 }
4558
4559 /* Create thread to dispatch registration */
4560 ret = pthread_create(&dispatch_thread, NULL,
4561 thread_dispatch_ust_registration, (void *) NULL);
4562 if (ret != 0) {
4563 PERROR("pthread_create dispatch");
4564 goto exit_dispatch;
4565 }
4566
4567 /* Create thread to manage application registration. */
4568 ret = pthread_create(&reg_apps_thread, NULL,
4569 thread_registration_apps, (void *) NULL);
4570 if (ret != 0) {
4571 PERROR("pthread_create registration");
4572 goto exit_reg_apps;
4573 }
4574
4575 /* Create thread to manage application socket */
4576 ret = pthread_create(&apps_thread, NULL,
4577 thread_manage_apps, (void *) NULL);
4578 if (ret != 0) {
4579 PERROR("pthread_create apps");
4580 goto exit_apps;
4581 }
4582
4583 /* Create kernel thread to manage kernel event */
4584 ret = pthread_create(&kernel_thread, NULL,
4585 thread_manage_kernel, (void *) NULL);
4586 if (ret != 0) {
4587 PERROR("pthread_create kernel");
4588 goto exit_kernel;
4589 }
4590
4591 ret = pthread_join(kernel_thread, &status);
4592 if (ret != 0) {
4593 PERROR("pthread_join");
4594 goto error; /* join error, exit without cleanup */
4595 }
4596
4597 exit_kernel:
4598 ret = pthread_join(apps_thread, &status);
4599 if (ret != 0) {
4600 PERROR("pthread_join");
4601 goto error; /* join error, exit without cleanup */
4602 }
4603
4604 exit_apps:
4605 ret = pthread_join(reg_apps_thread, &status);
4606 if (ret != 0) {
4607 PERROR("pthread_join");
4608 goto error; /* join error, exit without cleanup */
4609 }
4610
4611 exit_reg_apps:
4612 ret = pthread_join(dispatch_thread, &status);
4613 if (ret != 0) {
4614 PERROR("pthread_join");
4615 goto error; /* join error, exit without cleanup */
4616 }
4617
4618 exit_dispatch:
4619 ret = pthread_join(client_thread, &status);
4620 if (ret != 0) {
4621 PERROR("pthread_join");
4622 goto error; /* join error, exit without cleanup */
4623 }
4624
4625 ret = join_consumer_thread(&kconsumer_data);
4626 if (ret != 0) {
4627 PERROR("join_consumer");
4628 goto error; /* join error, exit without cleanup */
4629 }
4630
4631 exit_client:
4632 exit:
4633 /*
4634 * cleanup() is called when no other thread is running.
4635 */
4636 rcu_thread_online();
4637 cleanup();
4638 rcu_thread_offline();
4639 rcu_unregister_thread();
4640 if (!ret) {
4641 exit(EXIT_SUCCESS);
4642 }
4643 error:
4644 exit(EXIT_FAILURE);
4645 }
LTTng 2.0 tools and control repository
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