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Implement consumer bin/lib 32/64-bit configure/env/arg support
[lttng-tools.git] / lttng-sessiond / main.c
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CommitLineData
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
25#include <semaphore.h>
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/mman.h>
31#include <sys/mount.h>
32#include <sys/resource.h>
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
36#include <sys/wait.h>
37#include <urcu/futex.h>
38#include <unistd.h>
39#include <config.h>
40
41#include <lttng-consumerd.h>
42#include <lttng-sessiond-comm.h>
43#include <lttng/lttng-consumer.h>
44
45#include <lttngerr.h>
46
47#include "channel.h"
48#include "compat/poll.h"
49#include "context.h"
50#include "event.h"
51#include "futex.h"
52#include "hashtable.h"
53#include "kernel-ctl.h"
54#include "lttng-sessiond.h"
55#include "shm.h"
56#include "ust-app.h"
57#include "ust-ctl.h"
58#include "utils.h"
59
60#define CONSUMERD_FILE "lttng-consumerd"
61
62struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78};
79
80/* Const values */
81const char default_home_dir[] = DEFAULT_HOME_DIR;
82const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
83const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
86/* Variables */
87int opt_verbose; /* Not static for lttngerr.h */
88int opt_verbose_consumer; /* Not static for lttngerr.h */
89int opt_quiet; /* Not static for lttngerr.h */
90
91const char *progname;
92const char *opt_tracing_group;
93static int opt_sig_parent;
94static int opt_daemon;
95static int is_root; /* Set to 1 if the daemon is running as root */
96static pid_t ppid; /* Parent PID for --sig-parent option */
97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
103};
104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
113};
114
115static int dispatch_thread_exit;
116
117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
123
124/* Sockets and FDs */
125static int client_sock;
126static int apps_sock;
127static int kernel_tracer_fd;
128static int kernel_poll_pipe[2];
129
130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134static int thread_quit_pipe[2];
135
136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140static int apps_cmd_pipe[2];
141
142/* Pthread, Mutexes and Semaphores */
143static pthread_t apps_thread;
144static pthread_t reg_apps_thread;
145static pthread_t client_thread;
146static pthread_t kernel_thread;
147static pthread_t dispatch_thread;
148
149
150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
165 *
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
168 */
169static struct ltt_session_list *session_list_ptr;
170
171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
174static const char *consumerd32_path =
175 __stringify(CONFIG_CONSUMERD32_PATH);
176static const char *consumerd64_path =
177 __stringify(CONFIG_CONSUMERD64_PATH);
178static const char *consumerd32_libdir =
179 __stringify(CONFIG_CONSUMERD32_LIBDIR);
180static const char *consumerd64_libdir =
181 __stringify(CONFIG_CONSUMERD64_LIBDIR);
182
183static
184void setup_consumerd_path(void)
185{
186 const char *path, *libdir;
187
188 /*
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
192 */
193#if (CAA_BITS_PER_LONG == 32)
194 if (!consumerd32_path[0]) {
195 consumerd32_bindir = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
196 }
197 if (!consumerd32_libdir[0]) {
198 consumerd32_libdir = INSTALL_LIB_PATH;
199 }
200#elif (CAA_BITS_PER_LONG == 64)
201 if (!consumerd64_path[0]) {
202 consumerd64_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
203 }
204 if (!consumerd64_libdir[0]) {
205 consumerd64_libdir = INSTALL_LIB_PATH;
206 }
207#else
208#error "Unknown bitness"
209#endif
210
211 /*
212 * runtime env. var. overrides the build default.
213 */
214 path = getenv("LTTNG_CONSUMERD32_PATH");
215 if (path) {
216 consumerd32_path = path;
217 }
218 path = getenv("LTTNG_CONSUMERD64_PATH");
219 if (path) {
220 consumerd64_path = path;
221 }
222 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
223 if (libdir) {
224 consumerd32_libdir = libdir;
225 }
226 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
227 if (libdir) {
228 consumerd64_libdir = libdir;
229 }
230}
231
232/*
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
234 */
235static int create_thread_poll_set(struct lttng_poll_event *events,
236 unsigned int size)
237{
238 int ret;
239
240 if (events == NULL || size == 0) {
241 ret = -1;
242 goto error;
243 }
244
245 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
246 if (ret < 0) {
247 goto error;
248 }
249
250 /* Add quit pipe */
251 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
252 if (ret < 0) {
253 goto error;
254 }
255
256 return 0;
257
258error:
259 return ret;
260}
261
262/*
263 * Check if the thread quit pipe was triggered.
264 *
265 * Return 1 if it was triggered else 0;
266 */
267static int check_thread_quit_pipe(int fd, uint32_t events)
268{
269 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
270 return 1;
271 }
272
273 return 0;
274}
275
276/*
277 * Remove modules in reverse load order.
278 */
279static int modprobe_remove_kernel_modules(void)
280{
281 int ret = 0, i;
282 char modprobe[256];
283
284 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
285 ret = snprintf(modprobe, sizeof(modprobe),
286 "/sbin/modprobe -r -q %s",
287 kernel_modules_list[i].name);
288 if (ret < 0) {
289 perror("snprintf modprobe -r");
290 goto error;
291 }
292 modprobe[sizeof(modprobe) - 1] = '\0';
293 ret = system(modprobe);
294 if (ret == -1) {
295 ERR("Unable to launch modprobe -r for module %s",
296 kernel_modules_list[i].name);
297 } else if (kernel_modules_list[i].required
298 && WEXITSTATUS(ret) != 0) {
299 ERR("Unable to remove module %s",
300 kernel_modules_list[i].name);
301 } else {
302 DBG("Modprobe removal successful %s",
303 kernel_modules_list[i].name);
304 }
305 }
306
307error:
308 return ret;
309}
310
311/*
312 * Return group ID of the tracing group or -1 if not found.
313 */
314static gid_t allowed_group(void)
315{
316 struct group *grp;
317
318 if (opt_tracing_group) {
319 grp = getgrnam(opt_tracing_group);
320 } else {
321 grp = getgrnam(default_tracing_group);
322 }
323 if (!grp) {
324 return -1;
325 } else {
326 return grp->gr_gid;
327 }
328}
329
330/*
331 * Init thread quit pipe.
332 *
333 * Return -1 on error or 0 if all pipes are created.
334 */
335static int init_thread_quit_pipe(void)
336{
337 int ret;
338
339 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
340 if (ret < 0) {
341 perror("thread quit pipe");
342 goto error;
343 }
344
345error:
346 return ret;
347}
348
349/*
350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
352 */
353static void teardown_kernel_session(struct ltt_session *session)
354{
355 if (!session->kernel_session) {
356 DBG3("No kernel session when tearingdown session");
357 return;
358 }
359
360 DBG("Tearing down kernel session");
361
362 /*
363 * If a custom kernel consumer was registered, close the socket before
364 * tearing down the complete kernel session structure
365 */
366 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
367 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
368 }
369
370 trace_kernel_destroy_session(session->kernel_session);
371}
372
373/*
374 * Complete teardown of all UST sessions. This will free everything on his path
375 * and destroy the core essence of all ust sessions :)
376 */
377static void teardown_ust_session(struct ltt_session *session)
378{
379 int ret;
380
381 if (!session->ust_session) {
382 DBG3("No UST session when tearingdown session");
383 return;
384 }
385
386 DBG("Tearing down UST session(s)");
387
388 ret = ust_app_destroy_trace_all(session->ust_session);
389 if (ret) {
390 ERR("Error in ust_app_destroy_trace_all");
391 }
392
393 trace_ust_destroy_session(session->ust_session);
394}
395
396/*
397 * Stop all threads by closing the thread quit pipe.
398 */
399static void stop_threads(void)
400{
401 int ret;
402
403 /* Stopping all threads */
404 DBG("Terminating all threads");
405 ret = notify_thread_pipe(thread_quit_pipe[1]);
406 if (ret < 0) {
407 ERR("write error on thread quit pipe");
408 }
409
410 /* Dispatch thread */
411 dispatch_thread_exit = 1;
412 futex_nto1_wake(&ust_cmd_queue.futex);
413}
414
415/*
416 * Cleanup the daemon
417 */
418static void cleanup(void)
419{
420 int ret;
421 char *cmd;
422 struct ltt_session *sess, *stmp;
423
424 DBG("Cleaning up");
425
426 if (is_root) {
427 DBG("Removing %s directory", LTTNG_RUNDIR);
428 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
429 if (ret < 0) {
430 ERR("asprintf failed. Something is really wrong!");
431 }
432
433 /* Remove lttng run directory */
434 ret = system(cmd);
435 if (ret < 0) {
436 ERR("Unable to clean " LTTNG_RUNDIR);
437 }
438 }
439
440 DBG("Cleaning up all session");
441
442 /* Destroy session list mutex */
443 if (session_list_ptr != NULL) {
444 pthread_mutex_destroy(&session_list_ptr->lock);
445
446 /* Cleanup ALL session */
447 cds_list_for_each_entry_safe(sess, stmp,
448 &session_list_ptr->head, list) {
449 teardown_kernel_session(sess);
450 teardown_ust_session(sess);
451 free(sess);
452 }
453 }
454
455 DBG("Closing all UST sockets");
456 ust_app_clean_list();
457
458 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
459
460 DBG("Closing kernel fd");
461 close(kernel_tracer_fd);
462
463 if (is_root) {
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
470
471 /* <fun> */
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
476}
477
478/*
479 * Send data on a unix socket using the liblttsessiondcomm API.
480 *
481 * Return lttcomm error code.
482 */
483static int send_unix_sock(int sock, void *buf, size_t len)
484{
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491}
492
493/*
494 * Free memory of a command context structure.
495 */
496static void clean_command_ctx(struct command_ctx **cmd_ctx)
497{
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
502 }
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
505 }
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
508 }
509}
510
511/*
512 * Send all stream fds of kernel channel to the consumer.
513 */
514static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
515 int sock, struct ltt_kernel_channel *channel)
516{
517 int ret;
518 struct ltt_kernel_stream *stream;
519 struct lttcomm_consumer_msg lkm;
520
521 DBG("Sending streams of channel %s to kernel consumer",
522 channel->channel->name);
523
524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
531 if (ret < 0) {
532 perror("send consumer channel");
533 goto error;
534 }
535
536 /* Send streams */
537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
559 }
560 }
561
562 DBG("consumer channel streams sent");
563
564 return 0;
565
566error:
567 return ret;
568}
569
570/*
571 * Send all stream fds of the kernel session to the consumer.
572 */
573static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
574 struct ltt_kernel_session *session)
575{
576 int ret;
577 struct ltt_kernel_channel *chan;
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
580
581 DBG("Sending metadata stream fd");
582
583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
584 if (session->consumer_fd == 0) {
585 session->consumer_fd = consumer_data->cmd_sock;
586 }
587
588 if (session->metadata_stream_fd != 0) {
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
617 if (ret < 0) {
618 perror("send consumer stream");
619 goto error;
620 }
621 }
622
623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634error:
635 return ret;
636}
637
638/*
639 * Notify UST applications using the shm mmap futex.
640 */
641static int notify_ust_apps(int active)
642{
643 char *wait_shm_mmap;
644
645 DBG("Notifying applications of session daemon state: %d", active);
646
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
650 goto error;
651 }
652
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
658
659error:
660 return -1;
661}
662
663/*
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
667 *
668 * Return total size of the buffer pointed by buf.
669 */
670static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
671{
672 int ret, buf_size;
673
674 buf_size = size;
675
676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
677 if (cmd_ctx->llm == NULL) {
678 perror("zmalloc");
679 ret = -ENOMEM;
680 goto error;
681 }
682
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
686
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
690 return buf_size;
691
692error:
693 return ret;
694}
695
696/*
697 * Update the kernel poll set of all channel fd available over all tracing
698 * session. Add the wakeup pipe at the end of the set.
699 */
700static int update_kernel_poll(struct lttng_poll_event *events)
701{
702 int ret;
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
706 DBG("Updating kernel poll set");
707
708 session_lock_list();
709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
710 session_lock(session);
711 if (session->kernel_session == NULL) {
712 session_unlock(session);
713 continue;
714 }
715
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
721 session_unlock(session);
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
725 }
726 session_unlock(session);
727 }
728 session_unlock_list();
729
730 return 0;
731
732error:
733 session_unlock_list();
734 return -1;
735}
736
737/*
738 * Find the channel fd from 'fd' over all tracing session. When found, check
739 * for new channel stream and send those stream fds to the kernel consumer.
740 *
741 * Useful for CPU hotplug feature.
742 */
743static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
744{
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
751 session_lock_list();
752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
753 session_lock(session);
754 if (session->kernel_session == NULL) {
755 session_unlock(session);
756 continue;
757 }
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
762 }
763
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
770 goto error;
771 }
772
773 /*
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
777 */
778 if (session->kernel_session->consumer_fds_sent == 1) {
779 ret = send_kconsumer_channel_streams(consumer_data,
780 session->kernel_session->consumer_fd, channel);
781 if (ret < 0) {
782 goto error;
783 }
784 }
785 goto error;
786 }
787 }
788 session_unlock(session);
789 }
790 session_unlock_list();
791 return ret;
792
793error:
794 session_unlock(session);
795 session_unlock_list();
796 return ret;
797}
798
799/*
800 * For each tracing session, update newly registered apps.
801 */
802static void update_ust_app(int app_sock)
803{
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
811 }
812}
813
814/*
815 * This thread manage event coming from the kernel.
816 *
817 * Features supported in this thread:
818 * -) CPU Hotplug
819 */
820static void *thread_manage_kernel(void *data)
821{
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
824 char tmp;
825 struct lttng_poll_event events;
826
827 DBG("Thread manage kernel started");
828
829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
839 while (1) {
840 if (update_poll_flag == 1) {
841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
860
861 /* Poll infinite value of time */
862 ret = lttng_poll_wait(&events, -1);
863 if (ret < 0) {
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
869 continue;
870 }
871
872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
876
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
882
883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
894 ret = update_kernel_stream(&kconsumer_data, pollfd);
895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
903 }
904 }
905 }
906 }
907
908error:
909 DBG("Kernel thread dying");
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
912
913 lttng_poll_clean(&events);
914
915 return NULL;
916}
917
918/*
919 * This thread manage the consumer error sent back to the session daemon.
920 */
921static void *thread_manage_consumer(void *data)
922{
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
925 enum lttcomm_return_code code;
926 struct lttng_poll_event events;
927 struct consumer_data *consumer_data = data;
928
929 DBG("[thread] Manage consumer started");
930
931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
932 if (ret < 0) {
933 goto error;
934 }
935
936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
944
945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
951
952 /* Inifinite blocking call, waiting for transmission */
953 ret = lttng_poll_wait(&events, -1);
954 if (ret < 0) {
955 goto error;
956 }
957
958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
970 if (pollfd == consumer_data->err_sock) {
971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
972 ERR("consumer err socket poll error");
973 goto error;
974 }
975 }
976 }
977
978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
979 if (sock < 0) {
980 goto error;
981 }
982
983 DBG2("Receiving code from consumer err_sock");
984
985 /* Getting status code from kconsumerd */
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
988 if (ret <= 0) {
989 goto error;
990 }
991
992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
997 PERROR("consumer connect");
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1003 } else {
1004 ERR("consumer error when waiting for SOCK_READY : %s",
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
1009 /* Remove the kconsumerd error sock since we've established a connexion */
1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
1011 if (ret < 0) {
1012 goto error;
1013 }
1014
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
1017 goto error;
1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
1026 goto error;
1027 }
1028
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1043 ERR("consumer err socket second poll error");
1044 goto error;
1045 }
1046 }
1047 }
1048
1049 /* Wait for any kconsumerd error */
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
1052 if (ret <= 0) {
1053 ERR("consumer closed the command socket");
1054 goto error;
1055 }
1056
1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1058
1059error:
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
1063 close(sock);
1064
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1068
1069 lttng_poll_clean(&events);
1070
1071 return NULL;
1072}
1073
1074/*
1075 * This thread manage application communication.
1076 */
1077static void *thread_manage_apps(void *data)
1078{
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
1081 struct ust_command ust_cmd;
1082 struct lttng_poll_event events;
1083
1084 DBG("[thread] Manage application started");
1085
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
1093
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
1098
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
1102
1103 nb_fd = LTTNG_POLL_GETNB(&events);
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
1108 ret = lttng_poll_wait(&events, -1);
1109 if (ret < 0) {
1110 goto error;
1111 }
1112
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
1121 goto error;
1122 }
1123
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
1128 goto error;
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
1136
1137 /* Register applicaton to the session daemon */
1138 ret = ust_app_register(&ust_cmd.reg_msg,
1139 ust_cmd.sock);
1140 if (ret == -ENOMEM) {
1141 goto error;
1142 } else if (ret < 0) {
1143 break;
1144 }
1145
1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
1158 ust_app_unregister(ust_cmd.sock);
1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
1171 }
1172
1173 break;
1174 }
1175 } else {
1176 /*
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
1186
1187 /* Socket closed on remote end. */
1188 ust_app_unregister(pollfd);
1189 break;
1190 }
1191 }
1192 }
1193 }
1194
1195error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
1200 lttng_poll_clean(&events);
1201
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
1204 return NULL;
1205}
1206
1207/*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211static void *thread_dispatch_ust_registration(void *data)
1212{
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
1227 DBG("Woken up but nothing in the UST command queue");
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269}
1270
1271/*
1272 * This thread manage application registration.
1273 */
1274static void *thread_registration_apps(void *data)
1275{
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1284
1285 DBG("[thread] Manage application registration started");
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
1300
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
1306
1307 /* Notify all applications to register */
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
1313 }
1314
1315 while (1) {
1316 DBG("Accepting application registration");
1317
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
1320 /* Inifinite blocking call, waiting for transmission */
1321 ret = lttng_poll_wait(&events, -1);
1322 if (ret < 0) {
1323 goto error;
1324 }
1325
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
1330
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
1334 goto error;
1335 }
1336
1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
1347
1348 /* Create UST registration command for enqueuing */
1349 ust_cmd = zmalloc(sizeof(struct ust_command));
1350 if (ust_cmd == NULL) {
1351 perror("ust command zmalloc");
1352 goto error;
1353 }
1354
1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
1371
1372 ust_cmd->sock = sock;
1373
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1380
1381 /*
1382 * Lock free enqueue the registration request. The red pill
1383 * has been taken! This apps will be part of the *system*.
1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
1394 }
1395 }
1396
1397error:
1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
1405 unlink(apps_unix_sock_path);
1406
1407 lttng_poll_clean(&events);
1408
1409 return NULL;
1410}
1411
1412/*
1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1414 * exec or it will fails.
1415 */
1416static int spawn_consumer_thread(struct consumer_data *consumer_data)
1417{
1418 int ret;
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
1423
1424 /* Setup semaphore */
1425 ret = sem_init(&consumer_data->sem, 0, 0);
1426 if (ret < 0) {
1427 PERROR("sem_init consumer semaphore");
1428 goto error;
1429 }
1430
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
1433 if (ret != 0) {
1434 PERROR("pthread_create consumer");
1435 ret = -1;
1436 goto error;
1437 }
1438
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
1442 PERROR("clock_gettime spawn consumer");
1443 /* Infinite wait for the kconsumerd thread to be ready */
1444 ret = sem_wait(&consumer_data->sem);
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
1449 }
1450
1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
1459 if (ret < 0) {
1460 PERROR("pthread_cancel consumer thread");
1461 }
1462 } else {
1463 PERROR("semaphore wait failed consumer thread");
1464 }
1465 goto error;
1466 }
1467
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
1470 ERR("Kconsumerd did not start");
1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
1472 goto error;
1473 }
1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
1475
1476 return 0;
1477
1478error:
1479 return ret;
1480}
1481
1482/*
1483 * Join consumer thread
1484 */
1485static int join_consumer_thread(struct consumer_data *consumer_data)
1486{
1487 void *status;
1488 int ret;
1489
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
1492 if (ret) {
1493 ERR("Error killing consumer daemon");
1494 return ret;
1495 }
1496 return pthread_join(consumer_data->thread, &status);
1497 } else {
1498 return 0;
1499 }
1500}
1501
1502/*
1503 * Fork and exec a consumer daemon (consumerd).
1504 *
1505 * Return pid if successful else -1.
1506 */
1507static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1508{
1509 int ret;
1510 pid_t pid;
1511 const char *verbosity;
1512
1513 DBG("Spawning consumerd");
1514
1515 pid = fork();
1516 if (pid == 0) {
1517 /*
1518 * Exec consumerd.
1519 */
1520 if (opt_verbose > 1 || opt_verbose_consumer) {
1521 verbosity = "--verbose";
1522 } else {
1523 verbosity = "--quiet";
1524 }
1525 switch (consumer_data->type) {
1526 case LTTNG_CONSUMER_KERNEL:
1527 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1528 "lttng-consumerd", verbosity, "-k",
1529 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1530 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1531 NULL);
1532 break;
1533 case LTTNG_CONSUMER64_UST:
1534 {
1535 execl(consumerd64_path, verbosity, "-u",
1536 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1537 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1538 NULL);
1539 break;
1540 }
1541 case LTTNG_CONSUMER32_UST:
1542 {
1543 execl(consumerd32_path, verbosity, "-u",
1544 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1545 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1546 NULL);
1547 break;
1548 }
1549 default:
1550 perror("unknown consumer type");
1551 exit(EXIT_FAILURE);
1552 }
1553 if (errno != 0) {
1554 perror("kernel start consumer exec");
1555 }
1556 exit(EXIT_FAILURE);
1557 } else if (pid > 0) {
1558 ret = pid;
1559 } else {
1560 perror("start consumer fork");
1561 ret = -errno;
1562 }
1563 return ret;
1564}
1565
1566/*
1567 * Spawn the consumerd daemon and session daemon thread.
1568 */
1569static int start_consumerd(struct consumer_data *consumer_data)
1570{
1571 int ret;
1572
1573 pthread_mutex_lock(&consumer_data->pid_mutex);
1574 if (consumer_data->pid != 0) {
1575 pthread_mutex_unlock(&consumer_data->pid_mutex);
1576 goto end;
1577 }
1578
1579 ret = spawn_consumerd(consumer_data);
1580 if (ret < 0) {
1581 ERR("Spawning consumerd failed");
1582 pthread_mutex_unlock(&consumer_data->pid_mutex);
1583 goto error;
1584 }
1585
1586 /* Setting up the consumer_data pid */
1587 consumer_data->pid = ret;
1588 DBG2("Consumer pid %d", consumer_data->pid);
1589 pthread_mutex_unlock(&consumer_data->pid_mutex);
1590
1591 DBG2("Spawning consumer control thread");
1592 ret = spawn_consumer_thread(consumer_data);
1593 if (ret < 0) {
1594 ERR("Fatal error spawning consumer control thread");
1595 goto error;
1596 }
1597
1598end:
1599 return 0;
1600
1601error:
1602 return ret;
1603}
1604
1605/*
1606 * modprobe_kernel_modules
1607 */
1608static int modprobe_kernel_modules(void)
1609{
1610 int ret = 0, i;
1611 char modprobe[256];
1612
1613 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1614 ret = snprintf(modprobe, sizeof(modprobe),
1615 "/sbin/modprobe %s%s",
1616 kernel_modules_list[i].required ? "" : "-q ",
1617 kernel_modules_list[i].name);
1618 if (ret < 0) {
1619 perror("snprintf modprobe");
1620 goto error;
1621 }
1622 modprobe[sizeof(modprobe) - 1] = '\0';
1623 ret = system(modprobe);
1624 if (ret == -1) {
1625 ERR("Unable to launch modprobe for module %s",
1626 kernel_modules_list[i].name);
1627 } else if (kernel_modules_list[i].required
1628 && WEXITSTATUS(ret) != 0) {
1629 ERR("Unable to load module %s",
1630 kernel_modules_list[i].name);
1631 } else {
1632 DBG("Modprobe successfully %s",
1633 kernel_modules_list[i].name);
1634 }
1635 }
1636
1637error:
1638 return ret;
1639}
1640
1641/*
1642 * mount_debugfs
1643 */
1644static int mount_debugfs(char *path)
1645{
1646 int ret;
1647 char *type = "debugfs";
1648
1649 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1650 if (ret < 0) {
1651 PERROR("Cannot create debugfs path");
1652 goto error;
1653 }
1654
1655 ret = mount(type, path, type, 0, NULL);
1656 if (ret < 0) {
1657 PERROR("Cannot mount debugfs");
1658 goto error;
1659 }
1660
1661 DBG("Mounted debugfs successfully at %s", path);
1662
1663error:
1664 return ret;
1665}
1666
1667/*
1668 * Setup necessary data for kernel tracer action.
1669 */
1670static void init_kernel_tracer(void)
1671{
1672 int ret;
1673 char *proc_mounts = "/proc/mounts";
1674 char line[256];
1675 char *debugfs_path = NULL, *lttng_path = NULL;
1676 FILE *fp;
1677
1678 /* Detect debugfs */
1679 fp = fopen(proc_mounts, "r");
1680 if (fp == NULL) {
1681 ERR("Unable to probe %s", proc_mounts);
1682 goto error;
1683 }
1684
1685 while (fgets(line, sizeof(line), fp) != NULL) {
1686 if (strstr(line, "debugfs") != NULL) {
1687 /* Remove first string */
1688 strtok(line, " ");
1689 /* Dup string here so we can reuse line later on */
1690 debugfs_path = strdup(strtok(NULL, " "));
1691 DBG("Got debugfs path : %s", debugfs_path);
1692 break;
1693 }
1694 }
1695
1696 fclose(fp);
1697
1698 /* Mount debugfs if needded */
1699 if (debugfs_path == NULL) {
1700 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1701 if (ret < 0) {
1702 perror("asprintf debugfs path");
1703 goto error;
1704 }
1705 ret = mount_debugfs(debugfs_path);
1706 if (ret < 0) {
1707 perror("Cannot mount debugfs");
1708 goto error;
1709 }
1710 }
1711
1712 /* Modprobe lttng kernel modules */
1713 ret = modprobe_kernel_modules();
1714 if (ret < 0) {
1715 goto error;
1716 }
1717
1718 /* Setup lttng kernel path */
1719 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1720 if (ret < 0) {
1721 perror("asprintf lttng path");
1722 goto error;
1723 }
1724
1725 /* Open debugfs lttng */
1726 kernel_tracer_fd = open(lttng_path, O_RDWR);
1727 if (kernel_tracer_fd < 0) {
1728 DBG("Failed to open %s", lttng_path);
1729 goto error;
1730 }
1731
1732 free(lttng_path);
1733 free(debugfs_path);
1734 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1735 return;
1736
1737error:
1738 if (lttng_path) {
1739 free(lttng_path);
1740 }
1741 if (debugfs_path) {
1742 free(debugfs_path);
1743 }
1744 WARN("No kernel tracer available");
1745 kernel_tracer_fd = 0;
1746 return;
1747}
1748
1749/*
1750 * Init tracing by creating trace directory and sending fds kernel consumer.
1751 */
1752static int init_kernel_tracing(struct ltt_kernel_session *session)
1753{
1754 int ret = 0;
1755
1756 if (session->consumer_fds_sent == 0) {
1757 /*
1758 * Assign default kernel consumer socket if no consumer assigned to the
1759 * kernel session. At this point, it's NOT suppose to be 0 but this is
1760 * an extra security check.
1761 */
1762 if (session->consumer_fd == 0) {
1763 session->consumer_fd = kconsumer_data.cmd_sock;
1764 }
1765
1766 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1767 if (ret < 0) {
1768 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1769 goto error;
1770 }
1771
1772 session->consumer_fds_sent = 1;
1773 }
1774
1775error:
1776 return ret;
1777}
1778
1779/*
1780 * Create an UST session and add it to the session ust list.
1781 */
1782static int create_ust_session(struct ltt_session *session,
1783 struct lttng_domain *domain)
1784{
1785 int ret;
1786 unsigned int uid;
1787 struct ltt_ust_session *lus = NULL;
1788
1789 switch (domain->type) {
1790 case LTTNG_DOMAIN_UST:
1791 break;
1792 default:
1793 ret = LTTCOMM_UNKNOWN_DOMAIN;
1794 goto error;
1795 }
1796
1797 DBG("Creating UST session");
1798
1799 uid = session->uid;
1800 lus = trace_ust_create_session(session->path, uid, domain);
1801 if (lus == NULL) {
1802 ret = LTTCOMM_UST_SESS_FAIL;
1803 goto error;
1804 }
1805
1806 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1807 geteuid(), allowed_group());
1808 if (ret < 0) {
1809 if (ret != -EEXIST) {
1810 ERR("Trace directory creation error");
1811 ret = LTTCOMM_UST_SESS_FAIL;
1812 goto error;
1813 }
1814 }
1815
1816 /* The domain type dictate different actions on session creation */
1817 switch (domain->type) {
1818 case LTTNG_DOMAIN_UST:
1819 /* No ustctl for the global UST domain */
1820 break;
1821 default:
1822 ERR("Unknown UST domain on create session %d", domain->type);
1823 goto error;
1824 }
1825 session->ust_session = lus;
1826
1827 return LTTCOMM_OK;
1828
1829error:
1830 free(lus);
1831 return ret;
1832}
1833
1834/*
1835 * Create a kernel tracer session then create the default channel.
1836 */
1837static int create_kernel_session(struct ltt_session *session)
1838{
1839 int ret;
1840
1841 DBG("Creating kernel session");
1842
1843 ret = kernel_create_session(session, kernel_tracer_fd);
1844 if (ret < 0) {
1845 ret = LTTCOMM_KERN_SESS_FAIL;
1846 goto error;
1847 }
1848
1849 /* Set kernel consumer socket fd */
1850 if (kconsumer_data.cmd_sock) {
1851 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1852 }
1853
1854 ret = mkdir_recursive(session->kernel_session->trace_path,
1855 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
1856 if (ret < 0) {
1857 if (ret != -EEXIST) {
1858 ERR("Trace directory creation error");
1859 goto error;
1860 }
1861 }
1862
1863error:
1864 return ret;
1865}
1866
1867/*
1868 * Using the session list, filled a lttng_session array to send back to the
1869 * client for session listing.
1870 *
1871 * The session list lock MUST be acquired before calling this function. Use
1872 * session_lock_list() and session_unlock_list().
1873 */
1874static void list_lttng_sessions(struct lttng_session *sessions)
1875{
1876 int i = 0;
1877 struct ltt_session *session;
1878
1879 DBG("Getting all available session");
1880 /*
1881 * Iterate over session list and append data after the control struct in
1882 * the buffer.
1883 */
1884 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1885 strncpy(sessions[i].path, session->path, PATH_MAX);
1886 sessions[i].path[PATH_MAX - 1] = '\0';
1887 strncpy(sessions[i].name, session->name, NAME_MAX);
1888 sessions[i].name[NAME_MAX - 1] = '\0';
1889 sessions[i].enabled = session->enabled;
1890 i++;
1891 }
1892}
1893
1894/*
1895 * Fill lttng_channel array of all channels.
1896 */
1897static void list_lttng_channels(int domain, struct ltt_session *session,
1898 struct lttng_channel *channels)
1899{
1900 int i = 0;
1901 struct ltt_kernel_channel *kchan;
1902
1903 DBG("Listing channels for session %s", session->name);
1904
1905 switch (domain) {
1906 case LTTNG_DOMAIN_KERNEL:
1907 /* Kernel channels */
1908 if (session->kernel_session != NULL) {
1909 cds_list_for_each_entry(kchan,
1910 &session->kernel_session->channel_list.head, list) {
1911 /* Copy lttng_channel struct to array */
1912 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1913 channels[i].enabled = kchan->enabled;
1914 i++;
1915 }
1916 }
1917 break;
1918 case LTTNG_DOMAIN_UST:
1919 {
1920 struct cds_lfht_iter iter;
1921 struct ltt_ust_channel *uchan;
1922
1923 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
1924 &iter, uchan, node) {
1925 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1926 channels[i].attr.overwrite = uchan->attr.overwrite;
1927 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1928 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1929 channels[i].attr.switch_timer_interval =
1930 uchan->attr.switch_timer_interval;
1931 channels[i].attr.read_timer_interval =
1932 uchan->attr.read_timer_interval;
1933 channels[i].enabled = uchan->enabled;
1934 switch (uchan->attr.output) {
1935 case LTTNG_UST_MMAP:
1936 default:
1937 channels[i].attr.output = LTTNG_EVENT_MMAP;
1938 break;
1939 }
1940 i++;
1941 }
1942 break;
1943 }
1944 default:
1945 break;
1946 }
1947}
1948
1949/*
1950 * Create a list of ust global domain events.
1951 */
1952static int list_lttng_ust_global_events(char *channel_name,
1953 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1954{
1955 int i = 0, ret = 0;
1956 unsigned int nb_event = 0;
1957 struct cds_lfht_iter iter;
1958 struct cds_lfht_node *node;
1959 struct ltt_ust_channel *uchan;
1960 struct ltt_ust_event *uevent;
1961 struct lttng_event *tmp;
1962
1963 DBG("Listing UST global events for channel %s", channel_name);
1964
1965 rcu_read_lock();
1966
1967 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
1968 strlen(channel_name), &iter);
1969 if (node == NULL) {
1970 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
1971 goto error;
1972 }
1973
1974 uchan = caa_container_of(node, struct ltt_ust_channel, node);
1975
1976 nb_event += hashtable_get_count(uchan->events);
1977
1978 if (nb_event == 0) {
1979 ret = nb_event;
1980 goto error;
1981 }
1982
1983 DBG3("Listing UST global %d events", nb_event);
1984
1985 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
1986 if (tmp == NULL) {
1987 ret = -LTTCOMM_FATAL;
1988 goto error;
1989 }
1990
1991 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
1992 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
1993 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
1994 tmp[i].enabled = uevent->enabled;
1995 switch (uevent->attr.instrumentation) {
1996 case LTTNG_UST_TRACEPOINT:
1997 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
1998 break;
1999 case LTTNG_UST_PROBE:
2000 tmp[i].type = LTTNG_EVENT_PROBE;
2001 break;
2002 case LTTNG_UST_FUNCTION:
2003 tmp[i].type = LTTNG_EVENT_FUNCTION;
2004 break;
2005 }
2006 i++;
2007 }
2008
2009 ret = nb_event;
2010 *events = tmp;
2011
2012error:
2013 rcu_read_unlock();
2014 return ret;
2015}
2016
2017/*
2018 * Fill lttng_event array of all kernel events in the channel.
2019 */
2020static int list_lttng_kernel_events(char *channel_name,
2021 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2022{
2023 int i = 0, ret;
2024 unsigned int nb_event;
2025 struct ltt_kernel_event *event;
2026 struct ltt_kernel_channel *kchan;
2027
2028 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2029 if (kchan == NULL) {
2030 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2031 goto error;
2032 }
2033
2034 nb_event = kchan->event_count;
2035
2036 DBG("Listing events for channel %s", kchan->channel->name);
2037
2038 if (nb_event == 0) {
2039 ret = nb_event;
2040 goto error;
2041 }
2042
2043 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2044 if (*events == NULL) {
2045 ret = LTTCOMM_FATAL;
2046 goto error;
2047 }
2048
2049 /* Kernel channels */
2050 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2051 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2052 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2053 (*events)[i].enabled = event->enabled;
2054 switch (event->event->instrumentation) {
2055 case LTTNG_KERNEL_TRACEPOINT:
2056 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2057 break;
2058 case LTTNG_KERNEL_KPROBE:
2059 case LTTNG_KERNEL_KRETPROBE:
2060 (*events)[i].type = LTTNG_EVENT_PROBE;
2061 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2062 sizeof(struct lttng_kernel_kprobe));
2063 break;
2064 case LTTNG_KERNEL_FUNCTION:
2065 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2066 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2067 sizeof(struct lttng_kernel_function));
2068 break;
2069 case LTTNG_KERNEL_NOOP:
2070 (*events)[i].type = LTTNG_EVENT_NOOP;
2071 break;
2072 case LTTNG_KERNEL_SYSCALL:
2073 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2074 break;
2075 case LTTNG_KERNEL_ALL:
2076 assert(0);
2077 break;
2078 }
2079 i++;
2080 }
2081
2082 return nb_event;
2083
2084error:
2085 return ret;
2086}
2087
2088/*
2089 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2090 */
2091static int cmd_disable_channel(struct ltt_session *session,
2092 int domain, char *channel_name)
2093{
2094 int ret;
2095 struct ltt_ust_session *usess;
2096
2097 usess = session->ust_session;
2098
2099 switch (domain) {
2100 case LTTNG_DOMAIN_KERNEL:
2101 {
2102 ret = channel_kernel_disable(session->kernel_session,
2103 channel_name);
2104 if (ret != LTTCOMM_OK) {
2105 goto error;
2106 }
2107
2108 kernel_wait_quiescent(kernel_tracer_fd);
2109 break;
2110 }
2111 case LTTNG_DOMAIN_UST:
2112 {
2113 struct ltt_ust_channel *uchan;
2114
2115 /* Get channel in global UST domain HT */
2116 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2117 channel_name);
2118 if (uchan == NULL) {
2119 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2120 goto error;
2121 }
2122
2123 ret = ust_app_disable_channel_all(usess, uchan);
2124 if (ret < 0) {
2125 ret = LTTCOMM_UST_DISABLE_FAIL;
2126 goto error;
2127 }
2128
2129 uchan->enabled = 0;
2130
2131 break;
2132 }
2133 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2134 case LTTNG_DOMAIN_UST_EXEC_NAME:
2135 case LTTNG_DOMAIN_UST_PID:
2136 ret = LTTCOMM_NOT_IMPLEMENTED;
2137 goto error;
2138 default:
2139 ret = LTTCOMM_UNKNOWN_DOMAIN;
2140 goto error;
2141 }
2142
2143 ret = LTTCOMM_OK;
2144
2145error:
2146 return ret;
2147}
2148
2149/*
2150 * Copy channel from attributes and set it in the application channel list.
2151 */
2152/*
2153static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2154 struct lttng_channel *attr, struct ust_app *app)
2155{
2156 int ret;
2157 struct ltt_ust_channel *uchan, *new_chan;
2158
2159 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2160 if (uchan == NULL) {
2161 ret = LTTCOMM_FATAL;
2162 goto error;
2163 }
2164
2165 new_chan = trace_ust_create_channel(attr, usess->path);
2166 if (new_chan == NULL) {
2167 PERROR("malloc ltt_ust_channel");
2168 ret = LTTCOMM_FATAL;
2169 goto error;
2170 }
2171
2172 ret = channel_ust_copy(new_chan, uchan);
2173 if (ret < 0) {
2174 ret = LTTCOMM_FATAL;
2175 goto error;
2176 }
2177
2178error:
2179 return ret;
2180}
2181*/
2182
2183/*
2184 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2185 */
2186static int cmd_enable_channel(struct ltt_session *session,
2187 int domain, struct lttng_channel *attr)
2188{
2189 int ret;
2190 struct ltt_ust_session *usess = session->ust_session;
2191
2192 DBG("Enabling channel %s for session %s", attr->name, session->name);
2193
2194 switch (domain) {
2195 case LTTNG_DOMAIN_KERNEL:
2196 {
2197 struct ltt_kernel_channel *kchan;
2198
2199 kchan = trace_kernel_get_channel_by_name(attr->name,
2200 session->kernel_session);
2201 if (kchan == NULL) {
2202 ret = channel_kernel_create(session->kernel_session,
2203 attr, kernel_poll_pipe[1]);
2204 } else {
2205 ret = channel_kernel_enable(session->kernel_session, kchan);
2206 }
2207
2208 if (ret != LTTCOMM_OK) {
2209 goto error;
2210 }
2211
2212 kernel_wait_quiescent(kernel_tracer_fd);
2213 break;
2214 }
2215 case LTTNG_DOMAIN_UST:
2216 {
2217 struct ltt_ust_channel *uchan;
2218
2219 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2220
2221 /* Get channel in global UST domain HT */
2222 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2223 attr->name);
2224 if (uchan == NULL) {
2225 uchan = trace_ust_create_channel(attr, usess->pathname);
2226 if (uchan == NULL) {
2227 ret = LTTCOMM_UST_CHAN_FAIL;
2228 goto error;
2229 }
2230
2231 rcu_read_lock();
2232 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2233 rcu_read_unlock();
2234 DBG2("UST channel %s added to global domain HT", attr->name);
2235
2236 /* Add channel to all registered applications */
2237 ret = ust_app_create_channel_all(usess, uchan);
2238 if (ret != 0) {
2239 ret = LTTCOMM_UST_CHAN_FAIL;
2240 goto error;
2241 }
2242 } else {
2243 /* If already enabled, everything is OK */
2244 if (uchan->enabled) {
2245 ret = LTTCOMM_OK;
2246 goto error;
2247 }
2248
2249 ret = ust_app_enable_channel_all(usess, uchan);
2250 if (ret < 0) {
2251 ret = LTTCOMM_UST_ENABLE_FAIL;
2252 goto error;
2253 }
2254 }
2255
2256 uchan->enabled = 1;
2257
2258 break;
2259 }
2260 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2261 case LTTNG_DOMAIN_UST_EXEC_NAME:
2262 case LTTNG_DOMAIN_UST_PID:
2263 ret = LTTCOMM_NOT_IMPLEMENTED;
2264 goto error;
2265 default:
2266 ret = LTTCOMM_UNKNOWN_DOMAIN;
2267 goto error;
2268 }
2269
2270 ret = LTTCOMM_OK;
2271
2272error:
2273 return ret;
2274}
2275
2276/*
2277 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2278 */
2279static int cmd_disable_event(struct ltt_session *session, int domain,
2280 char *channel_name, char *event_name)
2281{
2282 int ret;
2283
2284 switch (domain) {
2285 case LTTNG_DOMAIN_KERNEL:
2286 {
2287 struct ltt_kernel_channel *kchan;
2288 struct ltt_kernel_session *ksess;
2289
2290 ksess = session->kernel_session;
2291
2292 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2293 if (kchan == NULL) {
2294 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2295 goto error;
2296 }
2297
2298 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2299 if (ret != LTTCOMM_OK) {
2300 goto error;
2301 }
2302
2303 kernel_wait_quiescent(kernel_tracer_fd);
2304 break;
2305 }
2306 case LTTNG_DOMAIN_UST:
2307 {
2308 struct ltt_ust_session *usess;
2309 struct ltt_ust_channel *uchan;
2310
2311 usess = session->ust_session;
2312
2313 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2314 channel_name);
2315 if (uchan == NULL) {
2316 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2317 goto error;
2318 }
2319
2320 ret = ust_app_disable_event(usess, uchan, event_name);
2321 if (ret < 0) {
2322 ret = LTTCOMM_UST_DISABLE_FAIL;
2323 goto error;
2324 }
2325
2326 DBG2("Disable UST event %s in channel %s completed", event_name,
2327 channel_name);
2328
2329 break;
2330 }
2331 case LTTNG_DOMAIN_UST_EXEC_NAME:
2332 case LTTNG_DOMAIN_UST_PID:
2333 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2334 default:
2335 ret = LTTCOMM_NOT_IMPLEMENTED;
2336 goto error;
2337 }
2338
2339 ret = LTTCOMM_OK;
2340
2341error:
2342 return ret;
2343}
2344
2345/*
2346 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2347 */
2348static int cmd_disable_event_all(struct ltt_session *session, int domain,
2349 char *channel_name)
2350{
2351 int ret;
2352
2353 switch (domain) {
2354 case LTTNG_DOMAIN_KERNEL:
2355 {
2356 struct ltt_kernel_session *ksess;
2357 struct ltt_kernel_channel *kchan;
2358
2359 ksess = session->kernel_session;
2360
2361 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2362 if (kchan == NULL) {
2363 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2364 goto error;
2365 }
2366
2367 ret = event_kernel_disable_all(ksess, kchan);
2368 if (ret != LTTCOMM_OK) {
2369 goto error;
2370 }
2371
2372 kernel_wait_quiescent(kernel_tracer_fd);
2373 break;
2374 }
2375 case LTTNG_DOMAIN_UST:
2376 {
2377 struct ltt_ust_session *usess;
2378 struct ltt_ust_channel *uchan;
2379
2380 usess = session->ust_session;
2381
2382 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2383 channel_name);
2384 if (uchan == NULL) {
2385 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2386 goto error;
2387 }
2388
2389 ret = ust_app_disable_event_all(usess, uchan);
2390 if (ret < 0) {
2391 ret = LTTCOMM_UST_DISABLE_FAIL;
2392 goto error;
2393 }
2394
2395 DBG2("Disable all UST event in channel %s completed", channel_name);
2396
2397 break;
2398 }
2399 case LTTNG_DOMAIN_UST_EXEC_NAME:
2400 case LTTNG_DOMAIN_UST_PID:
2401 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2402 default:
2403 ret = LTTCOMM_NOT_IMPLEMENTED;
2404 goto error;
2405 }
2406
2407 ret = LTTCOMM_OK;
2408
2409error:
2410 return ret;
2411}
2412
2413/*
2414 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2415 */
2416static int cmd_add_context(struct ltt_session *session, int domain,
2417 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2418{
2419 int ret;
2420
2421 switch (domain) {
2422 case LTTNG_DOMAIN_KERNEL:
2423 /* Add kernel context to kernel tracer */
2424 ret = context_kernel_add(session->kernel_session, ctx,
2425 event_name, channel_name);
2426 if (ret != LTTCOMM_OK) {
2427 goto error;
2428 }
2429 break;
2430 case LTTNG_DOMAIN_UST:
2431 {
2432 /*
2433 struct ltt_ust_session *usess;
2434
2435 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2436 ret = context_ust_add(usess, ctx,
2437 event_name, channel_name, domain);
2438 if (ret != LTTCOMM_OK) {
2439 goto error;
2440 }
2441 }
2442 break;
2443 */
2444 }
2445 default:
2446 /* TODO: UST other domains */
2447 ret = LTTCOMM_NOT_IMPLEMENTED;
2448 goto error;
2449 }
2450
2451 ret = LTTCOMM_OK;
2452
2453error:
2454 return ret;
2455}
2456
2457/*
2458 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2459 */
2460static int cmd_enable_event(struct ltt_session *session, int domain,
2461 char *channel_name, struct lttng_event *event)
2462{
2463 int ret;
2464 struct lttng_channel *attr;
2465 struct ltt_ust_session *usess = session->ust_session;
2466
2467 switch (domain) {
2468 case LTTNG_DOMAIN_KERNEL:
2469 {
2470 struct ltt_kernel_channel *kchan;
2471
2472 kchan = trace_kernel_get_channel_by_name(channel_name,
2473 session->kernel_session);
2474 if (kchan == NULL) {
2475 attr = channel_new_default_attr(domain);
2476 if (attr == NULL) {
2477 ret = LTTCOMM_FATAL;
2478 goto error;
2479 }
2480 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2481
2482 /* This call will notify the kernel thread */
2483 ret = channel_kernel_create(session->kernel_session,
2484 attr, kernel_poll_pipe[1]);
2485 if (ret != LTTCOMM_OK) {
2486 free(attr);
2487 goto error;
2488 }
2489 free(attr);
2490 }
2491
2492 /* Get the newly created kernel channel pointer */
2493 kchan = trace_kernel_get_channel_by_name(channel_name,
2494 session->kernel_session);
2495 if (kchan == NULL) {
2496 /* This sould not happen... */
2497 ret = LTTCOMM_FATAL;
2498 goto error;
2499 }
2500
2501 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2502 event);
2503 if (ret != LTTCOMM_OK) {
2504 goto error;
2505 }
2506
2507 kernel_wait_quiescent(kernel_tracer_fd);
2508 break;
2509 }
2510 case LTTNG_DOMAIN_UST:
2511 {
2512 struct ltt_ust_channel *uchan;
2513 struct ltt_ust_event *uevent;
2514 struct lttng_channel *attr;
2515
2516 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2517 channel_name);
2518 if (uchan == NULL) {
2519 /* Create default channel */
2520 attr = channel_new_default_attr(domain);
2521 if (attr == NULL) {
2522 ret = LTTCOMM_FATAL;
2523 goto error;
2524 }
2525 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2526
2527 /* Use the internal command enable channel */
2528 ret = cmd_enable_channel(session, domain, attr);
2529 if (ret < 0) {
2530 free(attr);
2531 goto error;
2532 }
2533
2534 free(attr);
2535
2536 /* Get the newly created channel reference back */
2537 uchan = trace_ust_find_channel_by_name(
2538 usess->domain_global.channels, channel_name);
2539 if (uchan == NULL) {
2540 /* Something is really wrong */
2541 ret = LTTCOMM_FATAL;
2542 goto error;
2543 }
2544 }
2545
2546 uevent = trace_ust_find_event_by_name(uchan->events, event->name);
2547 if (uevent == NULL) {
2548 uevent = trace_ust_create_event(event);
2549 if (uevent == NULL) {
2550 ret = LTTCOMM_FATAL;
2551 goto error;
2552 }
2553
2554 }
2555
2556 ret = ust_app_create_event_all(usess, uchan, uevent);
2557 if (ret < 0) {
2558 ret = LTTCOMM_UST_ENABLE_FAIL;
2559 goto error;
2560 }
2561
2562 /* Add ltt ust event to channel */
2563 rcu_read_lock();
2564 hashtable_add_unique(uchan->events, &uevent->node);
2565 rcu_read_unlock();
2566
2567 uevent->enabled = 1;
2568
2569 DBG3("UST ltt event %s added to channel %s", uevent->attr.name,
2570 uchan->name);
2571 break;
2572 }
2573 case LTTNG_DOMAIN_UST_EXEC_NAME:
2574 case LTTNG_DOMAIN_UST_PID:
2575 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2576 default:
2577 ret = LTTCOMM_NOT_IMPLEMENTED;
2578 goto error;
2579 }
2580
2581 ret = LTTCOMM_OK;
2582
2583error:
2584 return ret;
2585}
2586
2587/*
2588 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2589 */
2590static int cmd_enable_event_all(struct ltt_session *session, int domain,
2591 char *channel_name, int event_type)
2592{
2593 int ret;
2594 struct ltt_kernel_channel *kchan;
2595
2596 switch (domain) {
2597 case LTTNG_DOMAIN_KERNEL:
2598 kchan = trace_kernel_get_channel_by_name(channel_name,
2599 session->kernel_session);
2600 if (kchan == NULL) {
2601 /* This call will notify the kernel thread */
2602 ret = channel_kernel_create(session->kernel_session, NULL,
2603 kernel_poll_pipe[1]);
2604 if (ret != LTTCOMM_OK) {
2605 goto error;
2606 }
2607 }
2608
2609 /* Get the newly created kernel channel pointer */
2610 kchan = trace_kernel_get_channel_by_name(channel_name,
2611 session->kernel_session);
2612 if (kchan == NULL) {
2613 /* This sould not happen... */
2614 ret = LTTCOMM_FATAL;
2615 goto error;
2616 }
2617
2618 switch (event_type) {
2619 case LTTNG_KERNEL_SYSCALL:
2620 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2621 kchan, kernel_tracer_fd);
2622 break;
2623 case LTTNG_KERNEL_TRACEPOINT:
2624 /*
2625 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2626 * events already registered to the channel.
2627 */
2628 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2629 kchan, kernel_tracer_fd);
2630 break;
2631 case LTTNG_KERNEL_ALL:
2632 /* Enable syscalls and tracepoints */
2633 ret = event_kernel_enable_all(session->kernel_session,
2634 kchan, kernel_tracer_fd);
2635 break;
2636 default:
2637 ret = LTTCOMM_KERN_ENABLE_FAIL;
2638 goto error;
2639 }
2640 if (ret != LTTCOMM_OK) {
2641 goto error;
2642 }
2643
2644 kernel_wait_quiescent(kernel_tracer_fd);
2645 break;
2646 default:
2647 /* TODO: Userspace tracing */
2648 ret = LTTCOMM_NOT_IMPLEMENTED;
2649 goto error;
2650 }
2651
2652 ret = LTTCOMM_OK;
2653
2654error:
2655 return ret;
2656}
2657
2658/*
2659 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2660 */
2661static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2662{
2663 int ret;
2664 ssize_t nb_events = 0;
2665
2666 switch (domain) {
2667 case LTTNG_DOMAIN_KERNEL:
2668 nb_events = kernel_list_events(kernel_tracer_fd, events);
2669 if (nb_events < 0) {
2670 ret = LTTCOMM_KERN_LIST_FAIL;
2671 goto error;
2672 }
2673 break;
2674 case LTTNG_DOMAIN_UST:
2675 nb_events = ust_app_list_events(events);
2676 if (nb_events < 0) {
2677 ret = LTTCOMM_UST_LIST_FAIL;
2678 goto error;
2679 }
2680 break;
2681 default:
2682 ret = LTTCOMM_NOT_IMPLEMENTED;
2683 goto error;
2684 }
2685
2686 return nb_events;
2687
2688error:
2689 /* Return negative value to differentiate return code */
2690 return -ret;
2691}
2692
2693/*
2694 * Command LTTNG_START_TRACE processed by the client thread.
2695 */
2696static int cmd_start_trace(struct ltt_session *session)
2697{
2698 int ret;
2699 struct ltt_kernel_session *ksession;
2700 struct ltt_ust_session *usess;
2701
2702 /* Short cut */
2703 ksession = session->kernel_session;
2704 usess = session->ust_session;
2705
2706 if (session->enabled)
2707 return LTTCOMM_UST_START_FAIL;
2708 session->enabled = 1;
2709
2710 /* Kernel tracing */
2711 if (ksession != NULL) {
2712 struct ltt_kernel_channel *kchan;
2713
2714 /* Open kernel metadata */
2715 if (ksession->metadata == NULL) {
2716 ret = kernel_open_metadata(ksession, ksession->trace_path);
2717 if (ret < 0) {
2718 ret = LTTCOMM_KERN_META_FAIL;
2719 goto error;
2720 }
2721 }
2722
2723 /* Open kernel metadata stream */
2724 if (ksession->metadata_stream_fd == 0) {
2725 ret = kernel_open_metadata_stream(ksession);
2726 if (ret < 0) {
2727 ERR("Kernel create metadata stream failed");
2728 ret = LTTCOMM_KERN_STREAM_FAIL;
2729 goto error;
2730 }
2731 }
2732
2733 /* For each channel */
2734 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2735 if (kchan->stream_count == 0) {
2736 ret = kernel_open_channel_stream(kchan);
2737 if (ret < 0) {
2738 ret = LTTCOMM_KERN_STREAM_FAIL;
2739 goto error;
2740 }
2741 /* Update the stream global counter */
2742 ksession->stream_count_global += ret;
2743 }
2744 }
2745
2746 /* Setup kernel consumer socket and send fds to it */
2747 ret = init_kernel_tracing(ksession);
2748 if (ret < 0) {
2749 ret = LTTCOMM_KERN_START_FAIL;
2750 goto error;
2751 }
2752
2753 /* This start the kernel tracing */
2754 ret = kernel_start_session(ksession);
2755 if (ret < 0) {
2756 ret = LTTCOMM_KERN_START_FAIL;
2757 goto error;
2758 }
2759
2760 /* Quiescent wait after starting trace */
2761 kernel_wait_quiescent(kernel_tracer_fd);
2762 }
2763
2764 /* Flag session that trace should start automatically */
2765 if (usess) {
2766 usess->start_trace = 1;
2767
2768 ret = ust_app_start_trace_all(usess);
2769 if (ret < 0) {
2770 ret = LTTCOMM_UST_START_FAIL;
2771 goto error;
2772 }
2773 }
2774
2775 ret = LTTCOMM_OK;
2776
2777error:
2778 return ret;
2779}
2780
2781/*
2782 * Command LTTNG_STOP_TRACE processed by the client thread.
2783 */
2784static int cmd_stop_trace(struct ltt_session *session)
2785{
2786 int ret;
2787 struct ltt_kernel_channel *kchan;
2788 struct ltt_kernel_session *ksession;
2789 struct ltt_ust_session *usess;
2790
2791 /* Short cut */
2792 ksession = session->kernel_session;
2793 usess = session->ust_session;
2794
2795 if (!session->enabled)
2796 return LTTCOMM_UST_START_FAIL;
2797 session->enabled = 0;
2798
2799 /* Kernel tracer */
2800 if (ksession != NULL) {
2801 DBG("Stop kernel tracing");
2802
2803 /* Flush all buffers before stopping */
2804 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2805 if (ret < 0) {
2806 ERR("Kernel metadata flush failed");
2807 }
2808
2809 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2810 ret = kernel_flush_buffer(kchan);
2811 if (ret < 0) {
2812 ERR("Kernel flush buffer error");
2813 }
2814 }
2815
2816 ret = kernel_stop_session(ksession);
2817 if (ret < 0) {
2818 ret = LTTCOMM_KERN_STOP_FAIL;
2819 goto error;
2820 }
2821
2822 kernel_wait_quiescent(kernel_tracer_fd);
2823 }
2824
2825 if (usess) {
2826 usess->start_trace = 0;
2827
2828 ret = ust_app_stop_trace_all(usess);
2829 if (ret < 0) {
2830 ret = LTTCOMM_UST_START_FAIL;
2831 goto error;
2832 }
2833 }
2834
2835 ret = LTTCOMM_OK;
2836
2837error:
2838 return ret;
2839}
2840
2841/*
2842 * Command LTTNG_CREATE_SESSION processed by the client thread.
2843 */
2844static int cmd_create_session(char *name, char *path)
2845{
2846 int ret;
2847
2848 ret = session_create(name, path);
2849 if (ret != LTTCOMM_OK) {
2850 goto error;
2851 }
2852
2853 ret = LTTCOMM_OK;
2854
2855error:
2856 return ret;
2857}
2858
2859/*
2860 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2861 */
2862static int cmd_destroy_session(struct ltt_session *session, char *name)
2863{
2864 int ret;
2865
2866 /* Clean kernel session teardown */
2867 teardown_kernel_session(session);
2868 /* UST session teardown */
2869 teardown_ust_session(session);
2870
2871 /*
2872 * Must notify the kernel thread here to update it's poll setin order
2873 * to remove the channel(s)' fd just destroyed.
2874 */
2875 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2876 if (ret < 0) {
2877 perror("write kernel poll pipe");
2878 }
2879
2880 ret = session_destroy(session);
2881
2882 return ret;
2883}
2884
2885/*
2886 * Command LTTNG_CALIBRATE processed by the client thread.
2887 */
2888static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2889{
2890 int ret;
2891
2892 switch (domain) {
2893 case LTTNG_DOMAIN_KERNEL:
2894 {
2895 struct lttng_kernel_calibrate kcalibrate;
2896
2897 kcalibrate.type = calibrate->type;
2898 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2899 if (ret < 0) {
2900 ret = LTTCOMM_KERN_ENABLE_FAIL;
2901 goto error;
2902 }
2903 break;
2904 }
2905 default:
2906 /* TODO: Userspace tracing */
2907 ret = LTTCOMM_NOT_IMPLEMENTED;
2908 goto error;
2909 }
2910
2911 ret = LTTCOMM_OK;
2912
2913error:
2914 return ret;
2915}
2916
2917/*
2918 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2919 */
2920static int cmd_register_consumer(struct ltt_session *session, int domain,
2921 char *sock_path)
2922{
2923 int ret, sock;
2924
2925 switch (domain) {
2926 case LTTNG_DOMAIN_KERNEL:
2927 /* Can't register a consumer if there is already one */
2928 if (session->kernel_session->consumer_fd != 0) {
2929 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2930 goto error;
2931 }
2932
2933 sock = lttcomm_connect_unix_sock(sock_path);
2934 if (sock < 0) {
2935 ret = LTTCOMM_CONNECT_FAIL;
2936 goto error;
2937 }
2938
2939 session->kernel_session->consumer_fd = sock;
2940 break;
2941 default:
2942 /* TODO: Userspace tracing */
2943 ret = LTTCOMM_NOT_IMPLEMENTED;
2944 goto error;
2945 }
2946
2947 ret = LTTCOMM_OK;
2948
2949error:
2950 return ret;
2951}
2952
2953/*
2954 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2955 */
2956static ssize_t cmd_list_domains(struct ltt_session *session,
2957 struct lttng_domain **domains)
2958{
2959 int ret, index = 0;
2960 ssize_t nb_dom = 0;
2961
2962 if (session->kernel_session != NULL) {
2963 DBG3("Listing domains found kernel domain");
2964 nb_dom++;
2965 }
2966
2967 if (session->ust_session != NULL) {
2968 DBG3("Listing domains found UST global domain");
2969 nb_dom++;
2970 }
2971
2972 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2973 if (*domains == NULL) {
2974 ret = -LTTCOMM_FATAL;
2975 goto error;
2976 }
2977
2978 if (session->kernel_session != NULL) {
2979 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2980 index++;
2981 }
2982
2983 if (session->ust_session != NULL) {
2984 (*domains)[index].type = LTTNG_DOMAIN_UST;
2985 index++;
2986 }
2987
2988 return nb_dom;
2989
2990error:
2991 return ret;
2992}
2993
2994/*
2995 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2996 */
2997static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2998 struct lttng_channel **channels)
2999{
3000 int ret;
3001 ssize_t nb_chan = 0;
3002
3003 switch (domain) {
3004 case LTTNG_DOMAIN_KERNEL:
3005 if (session->kernel_session != NULL) {
3006 nb_chan = session->kernel_session->channel_count;
3007 }
3008 DBG3("Number of kernel channels %zd", nb_chan);
3009 break;
3010 case LTTNG_DOMAIN_UST:
3011 if (session->ust_session != NULL) {
3012 nb_chan = hashtable_get_count(
3013 session->ust_session->domain_global.channels);
3014 }
3015 DBG3("Number of UST global channels %zd", nb_chan);
3016 break;
3017 default:
3018 *channels = NULL;
3019 ret = -LTTCOMM_NOT_IMPLEMENTED;
3020 goto error;
3021 }
3022
3023 if (nb_chan > 0) {
3024 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3025 if (*channels == NULL) {
3026 ret = -LTTCOMM_FATAL;
3027 goto error;
3028 }
3029
3030 list_lttng_channels(domain, session, *channels);
3031 } else {
3032 *channels = NULL;
3033 }
3034
3035 return nb_chan;
3036
3037error:
3038 return ret;
3039}
3040
3041/*
3042 * Command LTTNG_LIST_EVENTS processed by the client thread.
3043 */
3044static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3045 char *channel_name, struct lttng_event **events)
3046{
3047 int ret = 0;
3048 ssize_t nb_event = 0;
3049
3050 switch (domain) {
3051 case LTTNG_DOMAIN_KERNEL:
3052 if (session->kernel_session != NULL) {
3053 nb_event = list_lttng_kernel_events(channel_name,
3054 session->kernel_session, events);
3055 }
3056 break;
3057 case LTTNG_DOMAIN_UST:
3058 {
3059 if (session->ust_session != NULL) {
3060 nb_event = list_lttng_ust_global_events(channel_name,
3061 &session->ust_session->domain_global, events);
3062 }
3063 break;
3064 }
3065 default:
3066 ret = -LTTCOMM_NOT_IMPLEMENTED;
3067 goto error;
3068 }
3069
3070 ret = nb_event;
3071
3072error:
3073 return ret;
3074}
3075
3076/*
3077 * Process the command requested by the lttng client within the command
3078 * context structure. This function make sure that the return structure (llm)
3079 * is set and ready for transmission before returning.
3080 *
3081 * Return any error encountered or 0 for success.
3082 */
3083static int process_client_msg(struct command_ctx *cmd_ctx)
3084{
3085 int ret = LTTCOMM_OK;
3086 int need_tracing_session = 1;
3087
3088 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3089
3090 /*
3091 * Check for command that don't needs to allocate a returned payload. We do
3092 * this here so we don't have to make the call for no payload at each
3093 * command.
3094 */
3095 switch(cmd_ctx->lsm->cmd_type) {
3096 case LTTNG_LIST_SESSIONS:
3097 case LTTNG_LIST_TRACEPOINTS:
3098 case LTTNG_LIST_DOMAINS:
3099 case LTTNG_LIST_CHANNELS:
3100 case LTTNG_LIST_EVENTS:
3101 break;
3102 default:
3103 /* Setup lttng message with no payload */
3104 ret = setup_lttng_msg(cmd_ctx, 0);
3105 if (ret < 0) {
3106 /* This label does not try to unlock the session */
3107 goto init_setup_error;
3108 }
3109 }
3110
3111 /* Commands that DO NOT need a session. */
3112 switch (cmd_ctx->lsm->cmd_type) {
3113 case LTTNG_CALIBRATE:
3114 case LTTNG_CREATE_SESSION:
3115 case LTTNG_LIST_SESSIONS:
3116 case LTTNG_LIST_TRACEPOINTS:
3117 need_tracing_session = 0;
3118 break;
3119 default:
3120 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3121 session_lock_list();
3122 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3123 session_unlock_list();
3124 if (cmd_ctx->session == NULL) {
3125 if (cmd_ctx->lsm->session.name != NULL) {
3126 ret = LTTCOMM_SESS_NOT_FOUND;
3127 } else {
3128 /* If no session name specified */
3129 ret = LTTCOMM_SELECT_SESS;
3130 }
3131 goto error;
3132 } else {
3133 /* Acquire lock for the session */
3134 session_lock(cmd_ctx->session);
3135 }
3136 break;
3137 }
3138
3139 /*
3140 * Check domain type for specific "pre-action".
3141 */
3142 switch (cmd_ctx->lsm->domain.type) {
3143 case LTTNG_DOMAIN_KERNEL:
3144 /* Kernel tracer check */
3145 if (kernel_tracer_fd == 0) {
3146 /* Basically, load kernel tracer modules */
3147 init_kernel_tracer();
3148 if (kernel_tracer_fd == 0) {
3149 ret = LTTCOMM_KERN_NA;
3150 goto error;
3151 }
3152 }
3153
3154 /* Need a session for kernel command */
3155 if (need_tracing_session) {
3156 if (cmd_ctx->session->kernel_session == NULL) {
3157 ret = create_kernel_session(cmd_ctx->session);
3158 if (ret < 0) {
3159 ret = LTTCOMM_KERN_SESS_FAIL;
3160 goto error;
3161 }
3162 }
3163
3164 /* Start the kernel consumer daemon */
3165 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3166 if (kconsumer_data.pid == 0 &&
3167 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3168 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3169 ret = start_consumerd(&kconsumer_data);
3170 if (ret < 0) {
3171 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3172 goto error;
3173 }
3174 } else {
3175 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3176 }
3177 }
3178 break;
3179 case LTTNG_DOMAIN_UST:
3180 {
3181 if (need_tracing_session) {
3182 if (cmd_ctx->session->ust_session == NULL) {
3183 ret = create_ust_session(cmd_ctx->session,
3184 &cmd_ctx->lsm->domain);
3185 if (ret != LTTCOMM_OK) {
3186 goto error;
3187 }
3188 }
3189 /* Start the UST consumer daemons */
3190 /* 64-bit */
3191 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3192 if (consumerd64_path[0] != '\0' &&
3193 ustconsumer64_data.pid == 0 &&
3194 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3195 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3196 ret = start_consumerd(&ustconsumer64_data);
3197 if (ret < 0) {
3198 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3199 ust_consumerd64_fd = -EINVAL;
3200 goto error;
3201 }
3202
3203 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3204 } else {
3205 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3206 }
3207 /* 32-bit */
3208 if (consumerd32_path[0] != '\0' &&
3209 ustconsumer32_data.pid == 0 &&
3210 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3211 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3212 ret = start_consumerd(&ustconsumer32_data);
3213 if (ret < 0) {
3214 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3215 ust_consumerd32_fd = -EINVAL;
3216 goto error;
3217 }
3218 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3219 } else {
3220 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3221 }
3222 }
3223 break;
3224 }
3225 default:
3226 break;
3227 }
3228
3229 /* Process by command type */
3230 switch (cmd_ctx->lsm->cmd_type) {
3231 case LTTNG_ADD_CONTEXT:
3232 {
3233 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3234 cmd_ctx->lsm->u.context.channel_name,
3235 cmd_ctx->lsm->u.context.event_name,
3236 &cmd_ctx->lsm->u.context.ctx);
3237 break;
3238 }
3239 case LTTNG_DISABLE_CHANNEL:
3240 {
3241 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3242 cmd_ctx->lsm->u.disable.channel_name);
3243 break;
3244 }
3245 case LTTNG_DISABLE_EVENT:
3246 {
3247 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3248 cmd_ctx->lsm->u.disable.channel_name,
3249 cmd_ctx->lsm->u.disable.name);
3250 ret = LTTCOMM_OK;
3251 break;
3252 }
3253 case LTTNG_DISABLE_ALL_EVENT:
3254 {
3255 DBG("Disabling all events");
3256
3257 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3258 cmd_ctx->lsm->u.disable.channel_name);
3259 break;
3260 }
3261 case LTTNG_ENABLE_CHANNEL:
3262 {
3263 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3264 &cmd_ctx->lsm->u.channel.chan);
3265 break;
3266 }
3267 case LTTNG_ENABLE_EVENT:
3268 {
3269 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3270 cmd_ctx->lsm->u.enable.channel_name,
3271 &cmd_ctx->lsm->u.enable.event);
3272 break;
3273 }
3274 case LTTNG_ENABLE_ALL_EVENT:
3275 {
3276 DBG("Enabling all events");
3277
3278 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3279 cmd_ctx->lsm->u.enable.channel_name,
3280 cmd_ctx->lsm->u.enable.event.type);
3281 break;
3282 }
3283 case LTTNG_LIST_TRACEPOINTS:
3284 {
3285 struct lttng_event *events;
3286 ssize_t nb_events;
3287
3288 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3289 if (nb_events < 0) {
3290 ret = -nb_events;
3291 goto error;
3292 }
3293
3294 /*
3295 * Setup lttng message with payload size set to the event list size in
3296 * bytes and then copy list into the llm payload.
3297 */
3298 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3299 if (ret < 0) {
3300 free(events);
3301 goto setup_error;
3302 }
3303
3304 /* Copy event list into message payload */
3305 memcpy(cmd_ctx->llm->payload, events,
3306 sizeof(struct lttng_event) * nb_events);
3307
3308 free(events);
3309
3310 ret = LTTCOMM_OK;
3311 break;
3312 }
3313 case LTTNG_START_TRACE:
3314 {
3315 ret = cmd_start_trace(cmd_ctx->session);
3316 break;
3317 }
3318 case LTTNG_STOP_TRACE:
3319 {
3320 ret = cmd_stop_trace(cmd_ctx->session);
3321 break;
3322 }
3323 case LTTNG_CREATE_SESSION:
3324 {
3325 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3326 cmd_ctx->lsm->session.path);
3327 break;
3328 }
3329 case LTTNG_DESTROY_SESSION:
3330 {
3331 ret = cmd_destroy_session(cmd_ctx->session,
3332 cmd_ctx->lsm->session.name);
3333 break;
3334 }
3335 case LTTNG_LIST_DOMAINS:
3336 {
3337 ssize_t nb_dom;
3338 struct lttng_domain *domains;
3339
3340 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3341 if (nb_dom < 0) {
3342 ret = -nb_dom;
3343 goto error;
3344 }
3345
3346 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3347 if (ret < 0) {
3348 goto setup_error;
3349 }
3350
3351 /* Copy event list into message payload */
3352 memcpy(cmd_ctx->llm->payload, domains,
3353 nb_dom * sizeof(struct lttng_domain));
3354
3355 free(domains);
3356
3357 ret = LTTCOMM_OK;
3358 break;
3359 }
3360 case LTTNG_LIST_CHANNELS:
3361 {
3362 size_t nb_chan;
3363 struct lttng_channel *channels;
3364
3365 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3366 cmd_ctx->session, &channels);
3367 if (nb_chan < 0) {
3368 ret = -nb_chan;
3369 goto error;
3370 }
3371
3372 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3373 if (ret < 0) {
3374 goto setup_error;
3375 }
3376
3377 /* Copy event list into message payload */
3378 memcpy(cmd_ctx->llm->payload, channels,
3379 nb_chan * sizeof(struct lttng_channel));
3380
3381 free(channels);
3382
3383 ret = LTTCOMM_OK;
3384 break;
3385 }
3386 case LTTNG_LIST_EVENTS:
3387 {
3388 ssize_t nb_event;
3389 struct lttng_event *events = NULL;
3390
3391 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3392 cmd_ctx->lsm->u.list.channel_name, &events);
3393 if (nb_event < 0) {
3394 ret = -nb_event;
3395 goto error;
3396 }
3397
3398 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3399 if (ret < 0) {
3400 goto setup_error;
3401 }
3402
3403 /* Copy event list into message payload */
3404 memcpy(cmd_ctx->llm->payload, events,
3405 nb_event * sizeof(struct lttng_event));
3406
3407 free(events);
3408
3409 ret = LTTCOMM_OK;
3410 break;
3411 }
3412 case LTTNG_LIST_SESSIONS:
3413 {
3414 session_lock_list();
3415
3416 if (session_list_ptr->count == 0) {
3417 ret = LTTCOMM_NO_SESSION;
3418 session_unlock_list();
3419 goto error;
3420 }
3421
3422 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3423 session_list_ptr->count);
3424 if (ret < 0) {
3425 session_unlock_list();
3426 goto setup_error;
3427 }
3428
3429 /* Filled the session array */
3430 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3431
3432 session_unlock_list();
3433
3434 ret = LTTCOMM_OK;
3435 break;
3436 }
3437 case LTTNG_CALIBRATE:
3438 {
3439 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3440 &cmd_ctx->lsm->u.calibrate);
3441 break;
3442 }
3443 case LTTNG_REGISTER_CONSUMER:
3444 {
3445 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3446 cmd_ctx->lsm->u.reg.path);
3447 break;
3448 }
3449 default:
3450 ret = LTTCOMM_UND;
3451 break;
3452 }
3453
3454error:
3455 if (cmd_ctx->llm == NULL) {
3456 DBG("Missing llm structure. Allocating one.");
3457 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3458 goto setup_error;
3459 }
3460 }
3461 /* Set return code */
3462 cmd_ctx->llm->ret_code = ret;
3463setup_error:
3464 if (cmd_ctx->session) {
3465 session_unlock(cmd_ctx->session);
3466 }
3467init_setup_error:
3468 return ret;
3469}
3470
3471/*
3472 * This thread manage all clients request using the unix client socket for
3473 * communication.
3474 */
3475static void *thread_manage_clients(void *data)
3476{
3477 int sock = 0, ret, i, pollfd;
3478 uint32_t revents, nb_fd;
3479 struct command_ctx *cmd_ctx = NULL;
3480 struct lttng_poll_event events;
3481
3482 DBG("[thread] Manage client started");
3483
3484 rcu_register_thread();
3485
3486 ret = lttcomm_listen_unix_sock(client_sock);
3487 if (ret < 0) {
3488 goto error;
3489 }
3490
3491 /*
3492 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3493 * more will be added to this poll set.
3494 */
3495 ret = create_thread_poll_set(&events, 2);
3496 if (ret < 0) {
3497 goto error;
3498 }
3499
3500 /* Add the application registration socket */
3501 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3502 if (ret < 0) {
3503 goto error;
3504 }
3505
3506 /*
3507 * Notify parent pid that we are ready to accept command for client side.
3508 */
3509 if (opt_sig_parent) {
3510 kill(ppid, SIGCHLD);
3511 }
3512
3513 while (1) {
3514 DBG("Accepting client command ...");
3515
3516 nb_fd = LTTNG_POLL_GETNB(&events);
3517
3518 /* Inifinite blocking call, waiting for transmission */
3519 ret = lttng_poll_wait(&events, -1);
3520 if (ret < 0) {
3521 goto error;
3522 }
3523
3524 for (i = 0; i < nb_fd; i++) {
3525 /* Fetch once the poll data */
3526 revents = LTTNG_POLL_GETEV(&events, i);
3527 pollfd = LTTNG_POLL_GETFD(&events, i);
3528
3529 /* Thread quit pipe has been closed. Killing thread. */
3530 ret = check_thread_quit_pipe(pollfd, revents);
3531 if (ret) {
3532 goto error;
3533 }
3534
3535 /* Event on the registration socket */
3536 if (pollfd == client_sock) {
3537 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3538 ERR("Client socket poll error");
3539 goto error;
3540 }
3541 }
3542 }
3543
3544 DBG("Wait for client response");
3545
3546 sock = lttcomm_accept_unix_sock(client_sock);
3547 if (sock < 0) {
3548 goto error;
3549 }
3550
3551 /* Allocate context command to process the client request */
3552 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3553 if (cmd_ctx == NULL) {
3554 perror("zmalloc cmd_ctx");
3555 goto error;
3556 }
3557
3558 /* Allocate data buffer for reception */
3559 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3560 if (cmd_ctx->lsm == NULL) {
3561 perror("zmalloc cmd_ctx->lsm");
3562 goto error;
3563 }
3564
3565 cmd_ctx->llm = NULL;
3566 cmd_ctx->session = NULL;
3567
3568 /*
3569 * Data is received from the lttng client. The struct
3570 * lttcomm_session_msg (lsm) contains the command and data request of
3571 * the client.
3572 */
3573 DBG("Receiving data from client ...");
3574 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3575 sizeof(struct lttcomm_session_msg));
3576 if (ret <= 0) {
3577 DBG("Nothing recv() from client... continuing");
3578 close(sock);
3579 free(cmd_ctx);
3580 continue;
3581 }
3582
3583 // TODO: Validate cmd_ctx including sanity check for
3584 // security purpose.
3585
3586 rcu_thread_online();
3587 /*
3588 * This function dispatch the work to the kernel or userspace tracer
3589 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3590 * informations for the client. The command context struct contains
3591 * everything this function may needs.
3592 */
3593 ret = process_client_msg(cmd_ctx);
3594 rcu_thread_offline();
3595 if (ret < 0) {
3596 /*
3597 * TODO: Inform client somehow of the fatal error. At
3598 * this point, ret < 0 means that a zmalloc failed
3599 * (ENOMEM). Error detected but still accept command.
3600 */
3601 clean_command_ctx(&cmd_ctx);
3602 continue;
3603 }
3604
3605 DBG("Sending response (size: %d, retcode: %s)",
3606 cmd_ctx->lttng_msg_size,
3607 lttng_strerror(-cmd_ctx->llm->ret_code));
3608 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3609 if (ret < 0) {
3610 ERR("Failed to send data back to client");
3611 }
3612
3613 clean_command_ctx(&cmd_ctx);
3614
3615 /* End of transmission */
3616 close(sock);
3617 }
3618
3619error:
3620 DBG("Client thread dying");
3621 unlink(client_unix_sock_path);
3622 close(client_sock);
3623 close(sock);
3624
3625 lttng_poll_clean(&events);
3626 clean_command_ctx(&cmd_ctx);
3627
3628 rcu_unregister_thread();
3629 return NULL;
3630}
3631
3632
3633/*
3634 * usage function on stderr
3635 */
3636static void usage(void)
3637{
3638 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3639 fprintf(stderr, " -h, --help Display this usage.\n");
3640 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3641 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3642 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3643 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3644 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3645 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3646 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3647 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3648 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3649 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3650 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3651 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3652 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3653 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3654 fprintf(stderr, " -V, --version Show version number.\n");
3655 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3656 fprintf(stderr, " -q, --quiet No output at all.\n");
3657 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3658 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3659}
3660
3661/*
3662 * daemon argument parsing
3663 */
3664static int parse_args(int argc, char **argv)
3665{
3666 int c;
3667
3668 static struct option long_options[] = {
3669 { "client-sock", 1, 0, 'c' },
3670 { "apps-sock", 1, 0, 'a' },
3671 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3672 { "kconsumerd-err-sock", 1, 0, 'E' },
3673 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3674 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3675 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3676 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3677 { "consumerd32-path", 1, 0, 'u' },
3678 { "consumerd32-libdir", 1, 0, 'U' },
3679 { "consumerd64-path", 1, 0, 't' },
3680 { "consumerd64-libdir", 1, 0, 'T' },
3681 { "daemonize", 0, 0, 'd' },
3682 { "sig-parent", 0, 0, 'S' },
3683 { "help", 0, 0, 'h' },
3684 { "group", 1, 0, 'g' },
3685 { "version", 0, 0, 'V' },
3686 { "quiet", 0, 0, 'q' },
3687 { "verbose", 0, 0, 'v' },
3688 { "verbose-consumer", 0, 0, 'Z' },
3689 { NULL, 0, 0, 0 }
3690 };
3691
3692 while (1) {
3693 int option_index = 0;
3694 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
3695 long_options, &option_index);
3696 if (c == -1) {
3697 break;
3698 }
3699
3700 switch (c) {
3701 case 0:
3702 fprintf(stderr, "option %s", long_options[option_index].name);
3703 if (optarg) {
3704 fprintf(stderr, " with arg %s\n", optarg);
3705 }
3706 break;
3707 case 'c':
3708 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3709 break;
3710 case 'a':
3711 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3712 break;
3713 case 'd':
3714 opt_daemon = 1;
3715 break;
3716 case 'g':
3717 opt_tracing_group = optarg;
3718 break;
3719 case 'h':
3720 usage();
3721 exit(EXIT_FAILURE);
3722 case 'V':
3723 fprintf(stdout, "%s\n", VERSION);
3724 exit(EXIT_SUCCESS);
3725 case 'S':
3726 opt_sig_parent = 1;
3727 break;
3728 case 'E':
3729 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3730 break;
3731 case 'C':
3732 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3733 break;
3734 case 'F':
3735 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3736 break;
3737 case 'D':
3738 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3739 break;
3740 case 'H':
3741 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3742 break;
3743 case 'G':
3744 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3745 break;
3746 case 'q':
3747 opt_quiet = 1;
3748 break;
3749 case 'v':
3750 /* Verbose level can increase using multiple -v */
3751 opt_verbose += 1;
3752 break;
3753 case 'Z':
3754 opt_verbose_consumer += 1;
3755 break;
3756 case 'u':
3757 consumerd32_path= optarg;
3758 break;
3759 case 'U':
3760 consumerd32_libdir = optarg;
3761 break;
3762 case 't':
3763 consumerd64_path = optarg;
3764 break;
3765 case 'T':
3766 consumerd64_libdir = optarg;
3767 break;
3768 default:
3769 /* Unknown option or other error.
3770 * Error is printed by getopt, just return */
3771 return -1;
3772 }
3773 }
3774
3775 return 0;
3776}
3777
3778/*
3779 * Creates the two needed socket by the daemon.
3780 * apps_sock - The communication socket for all UST apps.
3781 * client_sock - The communication of the cli tool (lttng).
3782 */
3783static int init_daemon_socket(void)
3784{
3785 int ret = 0;
3786 mode_t old_umask;
3787
3788 old_umask = umask(0);
3789
3790 /* Create client tool unix socket */
3791 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3792 if (client_sock < 0) {
3793 ERR("Create unix sock failed: %s", client_unix_sock_path);
3794 ret = -1;
3795 goto end;
3796 }
3797
3798 /* File permission MUST be 660 */
3799 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3800 if (ret < 0) {
3801 ERR("Set file permissions failed: %s", client_unix_sock_path);
3802 perror("chmod");
3803 goto end;
3804 }
3805
3806 /* Create the application unix socket */
3807 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3808 if (apps_sock < 0) {
3809 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3810 ret = -1;
3811 goto end;
3812 }
3813
3814 /* File permission MUST be 666 */
3815 ret = chmod(apps_unix_sock_path,
3816 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3817 if (ret < 0) {
3818 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3819 perror("chmod");
3820 goto end;
3821 }
3822
3823end:
3824 umask(old_umask);
3825 return ret;
3826}
3827
3828/*
3829 * Check if the global socket is available, and if a daemon is answering at the
3830 * other side. If yes, error is returned.
3831 */
3832static int check_existing_daemon(void)
3833{
3834 if (access(client_unix_sock_path, F_OK) < 0 &&
3835 access(apps_unix_sock_path, F_OK) < 0) {
3836 return 0;
3837 }
3838
3839 /* Is there anybody out there ? */
3840 if (lttng_session_daemon_alive()) {
3841 return -EEXIST;
3842 } else {
3843 return 0;
3844 }
3845}
3846
3847/*
3848 * Set the tracing group gid onto the client socket.
3849 *
3850 * Race window between mkdir and chown is OK because we are going from more
3851 * permissive (root.root) to les permissive (root.tracing).
3852 */
3853static int set_permissions(void)
3854{
3855 int ret;
3856 gid_t gid;
3857
3858 gid = allowed_group();
3859 if (gid < 0) {
3860 if (is_root) {
3861 WARN("No tracing group detected");
3862 ret = 0;
3863 } else {
3864 ERR("Missing tracing group. Aborting execution.");
3865 ret = -1;
3866 }
3867 goto end;
3868 }
3869
3870 /* Set lttng run dir */
3871 ret = chown(LTTNG_RUNDIR, 0, gid);
3872 if (ret < 0) {
3873 ERR("Unable to set group on " LTTNG_RUNDIR);
3874 perror("chown");
3875 }
3876
3877 /* lttng client socket path */
3878 ret = chown(client_unix_sock_path, 0, gid);
3879 if (ret < 0) {
3880 ERR("Unable to set group on %s", client_unix_sock_path);
3881 perror("chown");
3882 }
3883
3884 /* kconsumer error socket path */
3885 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3886 if (ret < 0) {
3887 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3888 perror("chown");
3889 }
3890
3891 /* 64-bit ustconsumer error socket path */
3892 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3893 if (ret < 0) {
3894 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3895 perror("chown");
3896 }
3897
3898 /* 32-bit ustconsumer compat32 error socket path */
3899 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3900 if (ret < 0) {
3901 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3902 perror("chown");
3903 }
3904
3905 DBG("All permissions are set");
3906
3907end:
3908 return ret;
3909}
3910
3911/*
3912 * Create the pipe used to wake up the kernel thread.
3913 */
3914static int create_kernel_poll_pipe(void)
3915{
3916 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3917}
3918
3919/*
3920 * Create the application command pipe to wake thread_manage_apps.
3921 */
3922static int create_apps_cmd_pipe(void)
3923{
3924 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3925}
3926
3927/*
3928 * Create the lttng run directory needed for all global sockets and pipe.
3929 */
3930static int create_lttng_rundir(void)
3931{
3932 int ret;
3933
3934 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
3935 if (ret < 0) {
3936 if (errno != EEXIST) {
3937 ERR("Unable to create " LTTNG_RUNDIR);
3938 goto error;
3939 } else {
3940 ret = 0;
3941 }
3942 }
3943
3944error:
3945 return ret;
3946}
3947
3948/*
3949 * Setup sockets and directory needed by the kconsumerd communication with the
3950 * session daemon.
3951 */
3952static int set_consumer_sockets(struct consumer_data *consumer_data)
3953{
3954 int ret;
3955 const char *path;
3956
3957 switch (consumer_data->type) {
3958 case LTTNG_CONSUMER_KERNEL:
3959 path = KCONSUMERD_PATH;
3960 break;
3961 case LTTNG_CONSUMER64_UST:
3962 path = USTCONSUMERD64_PATH;
3963 break;
3964 case LTTNG_CONSUMER32_UST:
3965 path = USTCONSUMERD32_PATH;
3966 break;
3967 default:
3968 ERR("Consumer type unknown");
3969 ret = -EINVAL;
3970 goto error;
3971 }
3972
3973 ret = mkdir(path, S_IRWXU | S_IRWXG);
3974 if (ret < 0) {
3975 if (errno != EEXIST) {
3976 ERR("Failed to create %s", path);
3977 goto error;
3978 }
3979 ret = 0;
3980 }
3981
3982 /* Create the kconsumerd error unix socket */
3983 consumer_data->err_sock =
3984 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
3985 if (consumer_data->err_sock < 0) {
3986 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
3987 ret = -1;
3988 goto error;
3989 }
3990
3991 /* File permission MUST be 660 */
3992 ret = chmod(consumer_data->err_unix_sock_path,
3993 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3994 if (ret < 0) {
3995 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
3996 perror("chmod");
3997 goto error;
3998 }
3999
4000error:
4001 return ret;
4002}
4003
4004/*
4005 * Signal handler for the daemon
4006 *
4007 * Simply stop all worker threads, leaving main() return gracefully after
4008 * joining all threads and calling cleanup().
4009 */
4010static void sighandler(int sig)
4011{
4012 switch (sig) {
4013 case SIGPIPE:
4014 DBG("SIGPIPE catched");
4015 return;
4016 case SIGINT:
4017 DBG("SIGINT catched");
4018 stop_threads();
4019 break;
4020 case SIGTERM:
4021 DBG("SIGTERM catched");
4022 stop_threads();
4023 break;
4024 default:
4025 break;
4026 }
4027}
4028
4029/*
4030 * Setup signal handler for :
4031 * SIGINT, SIGTERM, SIGPIPE
4032 */
4033static int set_signal_handler(void)
4034{
4035 int ret = 0;
4036 struct sigaction sa;
4037 sigset_t sigset;
4038
4039 if ((ret = sigemptyset(&sigset)) < 0) {
4040 perror("sigemptyset");
4041 return ret;
4042 }
4043
4044 sa.sa_handler = sighandler;
4045 sa.sa_mask = sigset;
4046 sa.sa_flags = 0;
4047 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4048 perror("sigaction");
4049 return ret;
4050 }
4051
4052 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4053 perror("sigaction");
4054 return ret;
4055 }
4056
4057 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4058 perror("sigaction");
4059 return ret;
4060 }
4061
4062 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4063
4064 return ret;
4065}
4066
4067/*
4068 * Set open files limit to unlimited. This daemon can open a large number of
4069 * file descriptors in order to consumer multiple kernel traces.
4070 */
4071static void set_ulimit(void)
4072{
4073 int ret;
4074 struct rlimit lim;
4075
4076 /* The kernel does not allowed an infinite limit for open files */
4077 lim.rlim_cur = 65535;
4078 lim.rlim_max = 65535;
4079
4080 ret = setrlimit(RLIMIT_NOFILE, &lim);
4081 if (ret < 0) {
4082 perror("failed to set open files limit");
4083 }
4084}
4085
4086/*
4087 * main
4088 */
4089int main(int argc, char **argv)
4090{
4091 int ret = 0;
4092 void *status;
4093 const char *home_path;
4094
4095 rcu_register_thread();
4096
4097 /* Create thread quit pipe */
4098 if ((ret = init_thread_quit_pipe()) < 0) {
4099 goto error;
4100 }
4101
4102 setup_consumerd_path();
4103
4104 /* Parse arguments */
4105 progname = argv[0];
4106 if ((ret = parse_args(argc, argv) < 0)) {
4107 goto error;
4108 }
4109
4110 /* Daemonize */
4111 if (opt_daemon) {
4112 ret = daemon(0, 0);
4113 if (ret < 0) {
4114 perror("daemon");
4115 goto error;
4116 }
4117 }
4118
4119 /* Check if daemon is UID = 0 */
4120 is_root = !getuid();
4121
4122 if (is_root) {
4123 ret = create_lttng_rundir();
4124 if (ret < 0) {
4125 goto error;
4126 }
4127
4128 if (strlen(apps_unix_sock_path) == 0) {
4129 snprintf(apps_unix_sock_path, PATH_MAX,
4130 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4131 }
4132
4133 if (strlen(client_unix_sock_path) == 0) {
4134 snprintf(client_unix_sock_path, PATH_MAX,
4135 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4136 }
4137
4138 /* Set global SHM for ust */
4139 if (strlen(wait_shm_path) == 0) {
4140 snprintf(wait_shm_path, PATH_MAX,
4141 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4142 }
4143 } else {
4144 home_path = get_home_dir();
4145 if (home_path == NULL) {
4146 /* TODO: Add --socket PATH option */
4147 ERR("Can't get HOME directory for sockets creation.");
4148 ret = -EPERM;
4149 goto error;
4150 }
4151
4152 if (strlen(apps_unix_sock_path) == 0) {
4153 snprintf(apps_unix_sock_path, PATH_MAX,
4154 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4155 }
4156
4157 /* Set the cli tool unix socket path */
4158 if (strlen(client_unix_sock_path) == 0) {
4159 snprintf(client_unix_sock_path, PATH_MAX,
4160 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4161 }
4162
4163 /* Set global SHM for ust */
4164 if (strlen(wait_shm_path) == 0) {
4165 snprintf(wait_shm_path, PATH_MAX,
4166 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4167 }
4168 }
4169
4170 DBG("Client socket path %s", client_unix_sock_path);
4171 DBG("Application socket path %s", apps_unix_sock_path);
4172
4173 /*
4174 * See if daemon already exist.
4175 */
4176 if ((ret = check_existing_daemon()) < 0) {
4177 ERR("Already running daemon.\n");
4178 /*
4179 * We do not goto exit because we must not cleanup()
4180 * because a daemon is already running.
4181 */
4182 goto error;
4183 }
4184
4185 /* After this point, we can safely call cleanup() with "goto exit" */
4186
4187 /*
4188 * These actions must be executed as root. We do that *after* setting up
4189 * the sockets path because we MUST make the check for another daemon using
4190 * those paths *before* trying to set the kernel consumer sockets and init
4191 * kernel tracer.
4192 */
4193 if (is_root) {
4194 ret = set_consumer_sockets(&kconsumer_data);
4195 if (ret < 0) {
4196 goto exit;
4197 }
4198
4199 ret = set_consumer_sockets(&ustconsumer64_data);
4200 if (ret < 0) {
4201 goto exit;
4202 }
4203
4204 ret = set_consumer_sockets(&ustconsumer32_data);
4205 if (ret < 0) {
4206 goto exit;
4207 }
4208
4209 /* Setup kernel tracer */
4210 init_kernel_tracer();
4211
4212 /* Set ulimit for open files */
4213 set_ulimit();
4214 }
4215
4216 if ((ret = set_signal_handler()) < 0) {
4217 goto exit;
4218 }
4219
4220 /* Setup the needed unix socket */
4221 if ((ret = init_daemon_socket()) < 0) {
4222 goto exit;
4223 }
4224
4225 /* Set credentials to socket */
4226 if (is_root && ((ret = set_permissions()) < 0)) {
4227 goto exit;
4228 }
4229
4230 /* Get parent pid if -S, --sig-parent is specified. */
4231 if (opt_sig_parent) {
4232 ppid = getppid();
4233 }
4234
4235 /* Setup the kernel pipe for waking up the kernel thread */
4236 if ((ret = create_kernel_poll_pipe()) < 0) {
4237 goto exit;
4238 }
4239
4240 /* Setup the thread apps communication pipe. */
4241 if ((ret = create_apps_cmd_pipe()) < 0) {
4242 goto exit;
4243 }
4244
4245 /* Init UST command queue. */
4246 cds_wfq_init(&ust_cmd_queue.queue);
4247
4248 /* Init UST app hash table */
4249 ust_app_ht_alloc();
4250
4251 /*
4252 * Get session list pointer. This pointer MUST NOT be free(). This list is
4253 * statically declared in session.c
4254 */
4255 session_list_ptr = session_get_list();
4256
4257 /* Set up max poll set size */
4258 lttng_poll_set_max_size();
4259
4260 /* Create thread to manage the client socket */
4261 ret = pthread_create(&client_thread, NULL,
4262 thread_manage_clients, (void *) NULL);
4263 if (ret != 0) {
4264 perror("pthread_create clients");
4265 goto exit_client;
4266 }
4267
4268 /* Create thread to dispatch registration */
4269 ret = pthread_create(&dispatch_thread, NULL,
4270 thread_dispatch_ust_registration, (void *) NULL);
4271 if (ret != 0) {
4272 perror("pthread_create dispatch");
4273 goto exit_dispatch;
4274 }
4275
4276 /* Create thread to manage application registration. */
4277 ret = pthread_create(&reg_apps_thread, NULL,
4278 thread_registration_apps, (void *) NULL);
4279 if (ret != 0) {
4280 perror("pthread_create registration");
4281 goto exit_reg_apps;
4282 }
4283
4284 /* Create thread to manage application socket */
4285 ret = pthread_create(&apps_thread, NULL,
4286 thread_manage_apps, (void *) NULL);
4287 if (ret != 0) {
4288 perror("pthread_create apps");
4289 goto exit_apps;
4290 }
4291
4292 /* Create kernel thread to manage kernel event */
4293 ret = pthread_create(&kernel_thread, NULL,
4294 thread_manage_kernel, (void *) NULL);
4295 if (ret != 0) {
4296 perror("pthread_create kernel");
4297 goto exit_kernel;
4298 }
4299
4300 ret = pthread_join(kernel_thread, &status);
4301 if (ret != 0) {
4302 perror("pthread_join");
4303 goto error; /* join error, exit without cleanup */
4304 }
4305
4306exit_kernel:
4307 ret = pthread_join(apps_thread, &status);
4308 if (ret != 0) {
4309 perror("pthread_join");
4310 goto error; /* join error, exit without cleanup */
4311 }
4312
4313exit_apps:
4314 ret = pthread_join(reg_apps_thread, &status);
4315 if (ret != 0) {
4316 perror("pthread_join");
4317 goto error; /* join error, exit without cleanup */
4318 }
4319
4320exit_reg_apps:
4321 ret = pthread_join(dispatch_thread, &status);
4322 if (ret != 0) {
4323 perror("pthread_join");
4324 goto error; /* join error, exit without cleanup */
4325 }
4326
4327exit_dispatch:
4328 ret = pthread_join(client_thread, &status);
4329 if (ret != 0) {
4330 perror("pthread_join");
4331 goto error; /* join error, exit without cleanup */
4332 }
4333
4334 ret = join_consumer_thread(&kconsumer_data);
4335 if (ret != 0) {
4336 perror("join_consumer");
4337 goto error; /* join error, exit without cleanup */
4338 }
4339
4340exit_client:
4341exit:
4342 /*
4343 * cleanup() is called when no other thread is running.
4344 */
4345 rcu_thread_online();
4346 cleanup();
4347 rcu_thread_offline();
4348 rcu_unregister_thread();
4349 if (!ret)
4350 exit(EXIT_SUCCESS);
4351error:
4352 exit(EXIT_FAILURE);
4353}
LTTng 2.0 tools and control repository
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