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Improve UST channel code
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD		 1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG		 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.
91d76f53 8 *
54d01ffb
DG		 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.
91d76f53 13 *
54d01ffb
DG		 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.
fac6795d
DG		 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>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG		 26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG		 33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG		 36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
fac6795d 46
54d01ffb 47#include "channel.h"
5eb91c98 48#include "compat/poll.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
f6a9efaa 52#include "hashtable.h"
4771f025 53#include "kernel.h"
32258573 54#include "lttng-sessiond.h"
0fdd1e2c 55#include "shm.h"
56fff090 56#include "ust-app.h"
1e307fab 57#include "ust-ctl.h"
8e68d1c8 58#include "utils.h"
fac6795d 59
ebaeda94
MD		 60#define CONSUMERD_FILE "lttng-consumerd"
61
3bd1e081
MD		 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
75462a81 80/* Const values */
686204ab 81const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 82const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD		 83const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
fac6795d 86/* Variables */
1d4b027a 87int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 88int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 89int opt_quiet; /* Not static for lttngerr.h */
d063d709 90
fac6795d
DG		 91const char *progname;
92const char *opt_tracing_group;
5b8719f5 93static int opt_sig_parent;
fac6795d
DG		 94static int opt_daemon;
95static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 96static pid_t ppid; /* Parent PID for --sig-parent option */
3bd1e081
MD		 97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
7753dea8
MD		 101 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
7753dea8
MD		 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,
3bd1e081
MD		 113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
DG		 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];
54d01ffb
DG		 121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
d6f42150
DG		 125static int client_sock;
126static int apps_sock;
20fe2104 127static int kernel_tracer_fd;
7a485870 128static int kernel_poll_pipe[2];
1d4b027a 129
273ea72c
DG		 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
099e26bd
DG		 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
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG		 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
b5541356
DG		 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.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD		 171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
fc7a59ce
AM		 174static const char *consumerd32_bin =
175 __stringify(CONFIG_CONSUMERD32_BIN);
176static const char *consumerd64_bin =
177 __stringify(CONFIG_CONSUMERD64_BIN);
ebaeda94
MD		 178static const char *consumerd32_libdir =
179 __stringify(CONFIG_CONSUMERD32_LIBDIR);
180static const char *consumerd64_libdir =
181 __stringify(CONFIG_CONSUMERD64_LIBDIR);
fb09408a
MD		 182
183static
7753dea8 184void setup_consumerd_path(void)
fb09408a 185{
fc7a59ce 186 const char *bin, *libdir;
fb09408a 187
7753dea8
MD		 188 /*
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
7753dea8 192 */
ebaeda94 193#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 194 if (!consumerd32_bin[0]) {
195 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 196 }
197 if (!consumerd32_libdir[0]) {
198 consumerd32_libdir = INSTALL_LIB_PATH;
199 }
200#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 201 if (!consumerd64_bin[0]) {
202 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 203 }
ebaeda94
MD		 204 if (!consumerd64_libdir[0]) {
205 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 206 }
207#else
208#error "Unknown bitness"
209#endif
210
fb09408a
MD		 211 /*
212 * runtime env. var. overrides the build default.
213 */
fc7a59ce
AM		 214 bin = getenv("LTTNG_CONSUMERD32_BIN");
215 if (bin) {
216 consumerd32_bin = bin;
7753dea8 217 }
fc7a59ce
AM		 218 bin = getenv("LTTNG_CONSUMERD64_BIN");
219 if (bin) {
220 consumerd64_bin = bin;
ebaeda94
MD		 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;
fb09408a
MD		 229 }
230}
231
5eb91c98
DG		 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
0fdd1e2c
DG		 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),
24b487b8 286 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG		 287 kernel_modules_list[i].name);
288 if (ret < 0) {
24b487b8 289 perror("snprintf modprobe -r");
0fdd1e2c
DG		 290 goto error;
291 }
292 modprobe[sizeof(modprobe) - 1] = '\0';
293 ret = system(modprobe);
294 if (ret == -1) {
24b487b8 295 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG		 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 */
996b65c8
MD		 314static gid_t allowed_group(void)
315{
316 struct group *grp;
317
274e143b
MD		 318 if (opt_tracing_group) {
319 grp = getgrnam(opt_tracing_group);
320 } else {
321 grp = getgrnam(default_tracing_group);
322 }
996b65c8
MD		 323 if (!grp) {
324 return -1;
325 } else {
326 return grp->gr_gid;
327 }
328}
329
273ea72c 330/*
5eb91c98 331 * Init thread quit pipe.
273ea72c
DG		 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
fac6795d 349/*
d063d709
DG		 350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
fac6795d 352 */
1d4b027a 353static void teardown_kernel_session(struct ltt_session *session)
fac6795d 354{
8f7a84dd
DG		 355 if (!session->kernel_session) {
356 DBG3("No kernel session when tearingdown session");
84ea9c99 357 return;
8f7a84dd
DG		 358 }
359
84ea9c99 360 DBG("Tearing down kernel session");
d9800920 361
84ea9c99
MD		 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);
fac6795d 368 }
84ea9c99
MD		 369
370 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 371}
372
f6a9efaa
DG		 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{
84cd17c6
MD		 379 int ret;
380
8f7a84dd
DG		 381 if (!session->ust_session) {
382 DBG3("No UST session when tearingdown session");
f470a390 383 return;
8f7a84dd
DG		 384 }
385
84ea9c99 386 DBG("Tearing down UST session(s)");
8f7a84dd 387
84cd17c6
MD		 388 ret = ust_app_destroy_trace_all(session->ust_session);
389 if (ret) {
390 ERR("Error in ust_app_destroy_trace_all");
391 }
8f7a84dd 392
f6a9efaa
DG		 393 trace_ust_destroy_session(session->ust_session);
394}
395
099e26bd
DG		 396/*
397 * Stop all threads by closing the thread quit pipe.
398 */
cf3af59e
MD		 399static void stop_threads(void)
400{
5eb91c98
DG		 401 int ret;
402
cf3af59e
MD		 403 /* Stopping all threads */
404 DBG("Terminating all threads");
54d01ffb 405 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 406 if (ret < 0) {
407 ERR("write error on thread quit pipe");
408 }
409
099e26bd
DG		 410 /* Dispatch thread */
411 dispatch_thread_exit = 1;
412 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 413}
414
fac6795d 415/*
d063d709 416 * Cleanup the daemon
fac6795d 417 */
cf3af59e 418static void cleanup(void)
fac6795d 419{
1d4b027a
DG		 420 int ret;
421 char *cmd;
af9737e9 422 struct ltt_session *sess, *stmp;
fac6795d 423
1d4b027a 424 DBG("Cleaning up");
e07ae692 425
5eb91c98
DG		 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 }
5461b305 432
5eb91c98
DG		 433 /* Remove lttng run directory */
434 ret = system(cmd);
435 if (ret < 0) {
436 ERR("Unable to clean " LTTNG_RUNDIR);
437 }
1d4b027a 438 }
5461b305 439
1d4b027a 440 DBG("Cleaning up all session");
fac6795d 441
b5541356 442 /* Destroy session list mutex */
273ea72c
DG		 443 if (session_list_ptr != NULL) {
444 pthread_mutex_destroy(&session_list_ptr->lock);
445
446 /* Cleanup ALL session */
54d01ffb
DG		 447 cds_list_for_each_entry_safe(sess, stmp,
448 &session_list_ptr->head, list) {
273ea72c 449 teardown_kernel_session(sess);
f6a9efaa
DG		 450 teardown_ust_session(sess);
451 free(sess);
273ea72c
DG		 452 }
453 }
454
099e26bd 455 DBG("Closing all UST sockets");
56fff090 456 ust_app_clean_list();
099e26bd 457
3bd1e081 458 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 459
f3ed775e 460 DBG("Closing kernel fd");
1d4b027a 461 close(kernel_tracer_fd);
ab147185 462
2f50c8a3
DG		 463 if (is_root) {
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
5eb91c98
DG		 467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
421cb601
DG		 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> */
fac6795d
DG		 476}
477
e065084a 478/*
d063d709 479 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 480 *
d063d709 481 * Return lttcomm error code.
e065084a
DG		 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
5461b305 493/*
d063d709 494 * Free memory of a command context structure.
5461b305 495 */
a2fb29a5 496static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 497{
a2fb29a5
DG		 498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
5461b305 502 }
a2fb29a5
DG		 503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
5461b305 505 }
a2fb29a5
DG		 506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
5461b305
DG		 508 }
509}
510
f3ed775e 511/*
d063d709 512 * Send all stream fds of kernel channel to the consumer.
f3ed775e 513 */
2bdd86d4 514static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
3bd1e081 515 int sock, struct ltt_kernel_channel *channel)
f3ed775e
DG		 516{
517 int ret;
f3ed775e 518 struct ltt_kernel_stream *stream;
3bd1e081 519 struct lttcomm_consumer_msg lkm;
f3ed775e 520
3bd1e081 521 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 522 channel->channel->name);
f3ed775e 523
3bd1e081
MD		 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 */
2bdd86d4 529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 531 if (ret < 0) {
3bd1e081 532 perror("send consumer channel");
f3ed775e
DG		 533 goto error;
534 }
535
3bd1e081 536 /* Send streams */
7a485870 537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 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;
f3ed775e
DG		 559 }
560 }
561
3bd1e081 562 DBG("consumer channel streams sent");
f3ed775e
DG		 563
564 return 0;
565
566error:
567 return ret;
568}
569
570/*
d063d709 571 * Send all stream fds of the kernel session to the consumer.
f3ed775e 572 */
2bdd86d4 573static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 574 struct ltt_kernel_session *session)
f3ed775e
DG		 575{
576 int ret;
577 struct ltt_kernel_channel *chan;
3bd1e081
MD		 578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
7a485870
DG		 580
581 DBG("Sending metadata stream fd");
582
2bdd86d4 583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 584 if (session->consumer_fd == 0) {
3bd1e081 585 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 586 }
587
7a485870 588 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 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);
7a485870 617 if (ret < 0) {
3bd1e081 618 perror("send consumer stream");
7a485870
DG		 619 goto error;
620 }
621 }
f3ed775e 622
f3ed775e 623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
2bdd86d4
MD		 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
fac6795d 638/*
0fdd1e2c 639 * Notify UST applications using the shm mmap futex.
fac6795d 640 */
0fdd1e2c 641static int notify_ust_apps(int active)
fac6795d 642{
0fdd1e2c 643 char *wait_shm_mmap;
fac6795d 644
0fdd1e2c 645 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 646
0fdd1e2c
DG		 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) {
fac6795d
DG		 650 goto error;
651 }
652
0fdd1e2c
DG		 653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
fac6795d
DG		 658
659error:
0fdd1e2c 660 return -1;
fac6795d
DG		 661}
662
e065084a 663/*
d063d709
DG		 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.
ca95a216 667 *
d063d709 668 * Return total size of the buffer pointed by buf.
ca95a216 669 */
5461b305 670static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 671{
f3ed775e 672 int ret, buf_size;
ca95a216 673
f3ed775e 674 buf_size = size;
5461b305 675
ba7f0ae5 676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 677 if (cmd_ctx->llm == NULL) {
ba7f0ae5 678 perror("zmalloc");
5461b305 679 ret = -ENOMEM;
ca95a216
DG		 680 goto error;
681 }
682
5461b305
DG		 683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 686
5461b305
DG		 687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
ca95a216
DG		 690 return buf_size;
691
692error:
693 return ret;
694}
695
7a485870 696/*
5eb91c98 697 * Update the kernel poll set of all channel fd available over all tracing
d063d709 698 * session. Add the wakeup pipe at the end of the set.
7a485870 699 */
5eb91c98 700static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 701{
5eb91c98 702 int ret;
7a485870
DG		 703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
5eb91c98 706 DBG("Updating kernel poll set");
7a485870 707
54d01ffb 708 session_lock_list();
b5541356 709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 710 session_lock(session);
7a485870 711 if (session->kernel_session == NULL) {
54d01ffb 712 session_unlock(session);
7a485870
DG		 713 continue;
714 }
7a485870 715
54d01ffb
DG		 716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
54d01ffb 721 session_unlock(session);
5eb91c98
DG		 722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 725 }
54d01ffb 726 session_unlock(session);
7a485870 727 }
54d01ffb 728 session_unlock_list();
7a485870 729
5eb91c98 730 return 0;
7a485870
DG		 731
732error:
54d01ffb 733 session_unlock_list();
7a485870
DG		 734 return -1;
735}
736
737/*
54d01ffb 738 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 739 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 740 *
d063d709 741 * Useful for CPU hotplug feature.
7a485870 742 */
2bdd86d4 743static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 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
54d01ffb 751 session_lock_list();
b5541356 752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 753 session_lock(session);
7a485870 754 if (session->kernel_session == NULL) {
54d01ffb 755 session_unlock(session);
7a485870
DG		 756 continue;
757 }
d9800920
DG		 758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 762 }
763
5eb91c98
DG		 764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
b3c750d2 770 goto error;
7a485870 771 }
d9800920 772
7a485870 773 /*
5eb91c98
DG		 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.
7a485870 777 */
3bd1e081 778 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 779 ret = send_kconsumer_channel_streams(consumer_data,
5eb91c98 780 session->kernel_session->consumer_fd, channel);
7a485870 781 if (ret < 0) {
b3c750d2 782 goto error;
7a485870
DG		 783 }
784 }
b3c750d2 785 goto error;
7a485870
DG		 786 }
787 }
54d01ffb 788 session_unlock(session);
7a485870 789 }
54d01ffb 790 session_unlock_list();
b3c750d2 791 return ret;
7a485870 792
b3c750d2 793error:
54d01ffb
DG		 794 session_unlock(session);
795 session_unlock_list();
7a485870
DG		 796 return ret;
797}
798
487cf67c
DG		 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) {
421cb601
DG		 808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
487cf67c
DG		 811 }
812}
813
7a485870 814/*
d063d709 815 * This thread manage event coming from the kernel.
7a485870 816 *
d063d709
DG		 817 * Features supported in this thread:
818 * -) CPU Hotplug
7a485870
DG		 819 */
820static void *thread_manage_kernel(void *data)
821{
5eb91c98
DG		 822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
7a485870 824 char tmp;
5eb91c98 825 struct lttng_poll_event events;
7a485870
DG		 826
827 DBG("Thread manage kernel started");
828
5eb91c98
DG		 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
7a485870
DG		 839 while (1) {
840 if (update_poll_flag == 1) {
5f822d0a
DG		 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
5eb91c98
DG		 847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
7a485870
DG		 849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
5eb91c98
DG		 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);
7a485870
DG		 860
861 /* Poll infinite value of time */
5eb91c98 862 ret = lttng_poll_wait(&events, -1);
7a485870 863 if (ret < 0) {
7a485870
DG		 864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
85611738
DG		 867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
7a485870
DG		 869 continue;
870 }
871
5eb91c98
DG		 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);
7a485870 876
5eb91c98
DG		 877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
7a485870 882
5eb91c98
DG		 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) {
2bdd86d4 894 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 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 */
7a485870 903 }
7a485870
DG		 904 }
905 }
906 }
907
908error:
909 DBG("Kernel thread dying");
273ea72c
DG		 910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
5eb91c98
DG		 912
913 lttng_poll_clean(&events);
914
7a485870
DG		 915 return NULL;
916}
917
1d4b027a 918/*
3bd1e081 919 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 920 */
3bd1e081 921static void *thread_manage_consumer(void *data)
1d4b027a 922{
5eb91c98
DG		 923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
1d4b027a 925 enum lttcomm_return_code code;
5eb91c98 926 struct lttng_poll_event events;
3bd1e081 927 struct consumer_data *consumer_data = data;
1d4b027a 928
3bd1e081 929 DBG("[thread] Manage consumer started");
1d4b027a 930
3bd1e081 931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 932 if (ret < 0) {
933 goto error;
934 }
935
5eb91c98
DG		 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 }
273ea72c 944
3bd1e081 945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 951
952 /* Inifinite blocking call, waiting for transmission */
5eb91c98 953 ret = lttng_poll_wait(&events, -1);
273ea72c 954 if (ret < 0) {
273ea72c
DG		 955 goto error;
956 }
957
5eb91c98
DG		 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 */
3bd1e081 970 if (pollfd == consumer_data->err_sock) {
5eb91c98 971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 972 ERR("consumer err socket poll error");
5eb91c98
DG		 973 goto error;
974 }
975 }
273ea72c
DG		 976 }
977
3bd1e081 978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 979 if (sock < 0) {
980 goto error;
981 }
982
3bd1e081 983 DBG2("Receiving code from consumer err_sock");
ee0b0061 984
712ea556 985 /* Getting status code from kconsumerd */
54d01ffb
DG		 986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 988 if (ret <= 0) {
989 goto error;
990 }
991
3bd1e081
MD		 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);
48842b30 997 PERROR("consumer connect");
1d4b027a
DG		 998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1d4b027a 1003 } else {
3bd1e081 1004 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
54d01ffb 1009 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1011 if (ret < 0) {
72079cae
DG		 1012 goto error;
1013 }
1014
5eb91c98
DG		 1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
72079cae 1017 goto error;
5eb91c98
DG		 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) {
72079cae
DG		 1026 goto error;
1027 }
1028
5eb91c98
DG		 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)) {
3bd1e081 1043 ERR("consumer err socket second poll error");
5eb91c98
DG		 1044 goto error;
1045 }
1046 }
1047 }
1048
712ea556 1049 /* Wait for any kconsumerd error */
54d01ffb
DG		 1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
712ea556 1052 if (ret <= 0) {
3bd1e081 1053 ERR("consumer closed the command socket");
712ea556 1054 goto error;
6f61d021 1055 }
1d4b027a 1056
3bd1e081 1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1058
1d4b027a 1059error:
3bd1e081
MD		 1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
5eb91c98 1063 close(sock);
273ea72c 1064
3bd1e081
MD		 1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1d4b027a 1068
5eb91c98 1069 lttng_poll_clean(&events);
0177d773 1070
5eb91c98 1071 return NULL;
099e26bd
DG		 1072}
1073
099e26bd
DG		 1074/*
1075 * This thread manage application communication.
1d4b027a
DG		 1076 */
1077static void *thread_manage_apps(void *data)
099e26bd 1078{
5eb91c98
DG		 1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
099e26bd 1081 struct ust_command ust_cmd;
5eb91c98 1082 struct lttng_poll_event events;
099e26bd
DG		 1083
1084 DBG("[thread] Manage application started");
1085
f6a9efaa
DG		 1086 rcu_register_thread();
1087 rcu_thread_online();
1088
5eb91c98
DG		 1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
099e26bd 1093
5eb91c98
DG		 1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
099e26bd 1098
5eb91c98
DG		 1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
0177d773 1102
5eb91c98 1103 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1108 ret = lttng_poll_wait(&events, -1);
099e26bd 1109 if (ret < 0) {
099e26bd
DG		 1110 goto error;
1111 }
1112
5eb91c98
DG		 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) {
099e26bd 1121 goto error;
5eb91c98 1122 }
099e26bd 1123
5eb91c98
DG		 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");
0177d773 1128 goto error;
5eb91c98
DG		 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 }
099e26bd 1136
5eb91c98 1137 /* Register applicaton to the session daemon */
56fff090 1138 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1139 ust_cmd.sock);
88ff5b7f 1140 if (ret == -ENOMEM) {
5eb91c98 1141 goto error;
88ff5b7f
MD		 1142 } else if (ret < 0) {
1143 break;
5eb91c98
DG		 1144 }
1145
acc7b41b
MD		 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
5eb91c98
DG		 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 */
56fff090 1158 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 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
54d01ffb
DG		 1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
5eb91c98 1171 }
487cf67c 1172
5eb91c98 1173 break;
0177d773 1174 }
5eb91c98
DG		 1175 } else {
1176 /*
54d01ffb
DG		 1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
5eb91c98
DG		 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 }
099e26bd 1186
b9d9b220 1187 /* Socket closed on remote end. */
56fff090 1188 ust_app_unregister(pollfd);
5eb91c98
DG		 1189 break;
1190 }
099e26bd
DG		 1191 }
1192 }
099e26bd
DG		 1193 }
1194
1195error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
5eb91c98 1200 lttng_poll_clean(&events);
099e26bd 1201
f6a9efaa
DG		 1202 rcu_thread_offline();
1203 rcu_unregister_thread();
099e26bd
DG		 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) {
00a17c97 1227 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
2f50c8a3
DG		 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);
099e26bd
DG		 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)
1d4b027a 1275{
5eb91c98
DG		 1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
099e26bd
DG		 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;
1d4b027a 1284
099e26bd 1285 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
5eb91c98
DG		 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 }
273ea72c 1300
5eb91c98
DG		 1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
273ea72c 1306
1d4b027a 1307 /* Notify all applications to register */
0fdd1e2c
DG		 1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
0fdd1e2c 1313 }
1d4b027a
DG		 1314
1315 while (1) {
1316 DBG("Accepting application registration");
273ea72c 1317
5eb91c98
DG		 1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
273ea72c 1320 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1321 ret = lttng_poll_wait(&events, -1);
273ea72c 1322 if (ret < 0) {
273ea72c
DG		 1323 goto error;
1324 }
1325
5eb91c98
DG		 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);
273ea72c 1330
5eb91c98
DG		 1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
90014c57
DG		 1334 goto error;
1335 }
1d4b027a 1336
5eb91c98
DG		 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 }
099e26bd 1347
5eb91c98 1348 /* Create UST registration command for enqueuing */
ba7f0ae5 1349 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1350 if (ust_cmd == NULL) {
ba7f0ae5 1351 perror("ust command zmalloc");
5eb91c98
DG		 1352 goto error;
1353 }
1d4b027a 1354
5eb91c98
DG		 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 }
099e26bd 1371
5eb91c98 1372 ust_cmd->sock = sock;
099e26bd 1373
5eb91c98
DG		 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);
54d01ffb 1380
5eb91c98
DG		 1381 /*
1382 * Lock free enqueue the registration request. The red pill
54d01ffb 1383 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 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 }
90014c57 1394 }
1d4b027a
DG		 1395 }
1396
1397error:
0fdd1e2c
DG		 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);
273ea72c 1405 unlink(apps_unix_sock_path);
0fdd1e2c 1406
5eb91c98
DG		 1407 lttng_poll_clean(&events);
1408
1d4b027a
DG		 1409 return NULL;
1410}
1411
8c0faa1d 1412/*
3bd1e081 1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1414 * exec or it will fails.
8c0faa1d 1415 */
3bd1e081 1416static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1417{
1418 int ret;
ee0b0061
DG		 1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
8c0faa1d
DG		 1423
1424 /* Setup semaphore */
3bd1e081 1425 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1426 if (ret < 0) {
3bd1e081 1427 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1428 goto error;
1429 }
8c0faa1d 1430
3bd1e081
MD		 1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
8c0faa1d 1433 if (ret != 0) {
3bd1e081 1434 PERROR("pthread_create consumer");
ee0b0061 1435 ret = -1;
8c0faa1d
DG		 1436 goto error;
1437 }
1438
ee0b0061
DG		 1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
3bd1e081 1442 PERROR("clock_gettime spawn consumer");
ee0b0061 1443 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1444 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1449 }
8c0faa1d 1450
ee0b0061
DG		 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 */
3bd1e081
MD		 1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1459 if (ret < 0) {
3bd1e081 1460 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1461 }
1462 } else {
3bd1e081 1463 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1464 }
1465 goto error;
1466 }
1467
3bd1e081
MD		 1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
712ea556 1470 ERR("Kconsumerd did not start");
3bd1e081 1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1472 goto error;
1473 }
3bd1e081 1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1475
8c0faa1d
DG		 1476 return 0;
1477
1478error:
1479 return ret;
1480}
1481
d9800920 1482/*
3bd1e081 1483 * Join consumer thread
d9800920 1484 */
3bd1e081 1485static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1486{
1487 void *status;
1488 int ret;
1489
3bd1e081
MD		 1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1492 if (ret) {
3bd1e081 1493 ERR("Error killing consumer daemon");
cf3af59e
MD		 1494 return ret;
1495 }
3bd1e081 1496 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1497 } else {
1498 return 0;
1499 }
1500}
1501
8c0faa1d 1502/*
3bd1e081 1503 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1504 *
d063d709 1505 * Return pid if successful else -1.
8c0faa1d 1506 */
3bd1e081 1507static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1508{
1509 int ret;
1510 pid_t pid;
94c55f17 1511 const char *consumer_to_use;
53086306 1512 const char *verbosity;
94c55f17 1513 struct stat st;
8c0faa1d 1514
3bd1e081 1515 DBG("Spawning consumerd");
c49dc785 1516
8c0faa1d
DG		 1517 pid = fork();
1518 if (pid == 0) {
1519 /*
3bd1e081 1520 * Exec consumerd.
8c0faa1d 1521 */
3bd1e081 1522 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG		 1523 verbosity = "--verbose";
1524 } else {
1525 verbosity = "--quiet";
1526 }
3bd1e081
MD		 1527 switch (consumer_data->type) {
1528 case LTTNG_CONSUMER_KERNEL:
94c55f17 1529 /*
f806231f
MD		 1530 * Find out which consumerd to execute. We will
1531 * first try the 64-bit path, then the
1532 * sessiond's installation directory, and
1533 * fallback on the 32-bit one,
94c55f17
AM		 1534 */
1535 if (stat(consumerd64_bin, &st) == 0) {
1536 consumer_to_use = consumerd64_bin;
94c55f17
AM		 1537 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1538 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4
MD		 1539 } else if (stat(consumerd32_bin, &st) == 0) {
1540 consumer_to_use = consumerd32_bin;
94c55f17
AM		 1541 } else {
1542 break;
1543 }
1544 DBG("Using kernel consumer at: %s", consumer_to_use);
1545 execl(consumer_to_use,
1546 "lttng-consumerd", verbosity, "-k",
1547 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1548 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1549 NULL);
3bd1e081 1550 break;
7753dea8
MD		 1551 case LTTNG_CONSUMER64_UST:
1552 {
b1e0b6b6 1553 char *tmpnew = NULL;
8f4905da
MD		 1554
1555 if (consumerd64_libdir[0] != '\0') {
1556 char *tmp;
1557 size_t tmplen;
1558
1559 tmp = getenv("LD_LIBRARY_PATH");
1560 if (!tmp) {
1561 tmp = "";
1562 }
1563 tmplen = strlen("LD_LIBRARY_PATH=")
1564 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1565 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1566 if (!tmpnew) {
1567 ret = -ENOMEM;
1568 goto error;
1569 }
1570 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1571 strcat(tmpnew, consumerd64_libdir);
1572 if (tmp[0] != '\0') {
1573 strcat(tmpnew, ":");
1574 strcat(tmpnew, tmp);
1575 }
1576 ret = putenv(tmpnew);
1577 if (ret) {
1578 ret = -errno;
1579 goto error;
1580 }
1581 }
94c55f17 1582 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
fc7a59ce 1583 ret = execl(consumerd64_bin, verbosity, "-u",
7753dea8
MD		 1584 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1585 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1586 NULL);
8f4905da
MD		 1587 if (consumerd64_libdir[0] != '\0') {
1588 free(tmpnew);
1589 }
1590 if (ret) {
1591 goto error;
1592 }
3bd1e081 1593 break;
7753dea8
MD		 1594 }
1595 case LTTNG_CONSUMER32_UST:
1596 {
937dde8e 1597 char *tmpnew = NULL;
8f4905da
MD		 1598
1599 if (consumerd32_libdir[0] != '\0') {
1600 char *tmp;
1601 size_t tmplen;
1602
1603 tmp = getenv("LD_LIBRARY_PATH");
1604 if (!tmp) {
1605 tmp = "";
1606 }
1607 tmplen = strlen("LD_LIBRARY_PATH=")
1608 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1609 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1610 if (!tmpnew) {
1611 ret = -ENOMEM;
1612 goto error;
1613 }
1614 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1615 strcat(tmpnew, consumerd32_libdir);
1616 if (tmp[0] != '\0') {
1617 strcat(tmpnew, ":");
1618 strcat(tmpnew, tmp);
1619 }
1620 ret = putenv(tmpnew);
1621 if (ret) {
1622 ret = -errno;
1623 goto error;
1624 }
1625 }
94c55f17 1626 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
fc7a59ce 1627 ret = execl(consumerd32_bin, verbosity, "-u",
7753dea8
MD		 1628 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1629 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1630 NULL);
8f4905da
MD		 1631 if (consumerd32_libdir[0] != '\0') {
1632 free(tmpnew);
1633 }
1634 if (ret) {
1635 goto error;
1636 }
7753dea8
MD		 1637 break;
1638 }
3bd1e081
MD		 1639 default:
1640 perror("unknown consumer type");
1641 exit(EXIT_FAILURE);
1642 }
8c0faa1d
DG		 1643 if (errno != 0) {
1644 perror("kernel start consumer exec");
1645 }
1646 exit(EXIT_FAILURE);
1647 } else if (pid > 0) {
1648 ret = pid;
8c0faa1d 1649 } else {
3bd1e081 1650 perror("start consumer fork");
8c0faa1d 1651 ret = -errno;
8c0faa1d 1652 }
8f4905da 1653error:
8c0faa1d
DG		 1654 return ret;
1655}
1656
693bd40b 1657/*
3bd1e081 1658 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1659 */
3bd1e081 1660static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1661{
1662 int ret;
1663
3bd1e081
MD		 1664 pthread_mutex_lock(&consumer_data->pid_mutex);
1665 if (consumer_data->pid != 0) {
1666 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1667 goto end;
1668 }
693bd40b 1669
3bd1e081 1670 ret = spawn_consumerd(consumer_data);
c49dc785 1671 if (ret < 0) {
3bd1e081
MD		 1672 ERR("Spawning consumerd failed");
1673 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1674 goto error;
693bd40b 1675 }
c49dc785 1676
3bd1e081
MD		 1677 /* Setting up the consumer_data pid */
1678 consumer_data->pid = ret;
48842b30 1679 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1680 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1681
3bd1e081
MD		 1682 DBG2("Spawning consumer control thread");
1683 ret = spawn_consumer_thread(consumer_data);
693bd40b 1684 if (ret < 0) {
3bd1e081 1685 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1686 goto error;
1687 }
1688
c49dc785 1689end:
693bd40b
DG		 1690 return 0;
1691
1692error:
1693 return ret;
1694}
1695
b73401da 1696/*
d063d709 1697 * modprobe_kernel_modules
b73401da
DG		 1698 */
1699static int modprobe_kernel_modules(void)
1700{
ab147185 1701 int ret = 0, i;
b73401da
DG		 1702 char modprobe[256];
1703
ab147185
MD		 1704 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1705 ret = snprintf(modprobe, sizeof(modprobe),
1706 "/sbin/modprobe %s%s",
24b487b8 1707 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1708 kernel_modules_list[i].name);
b73401da
DG		 1709 if (ret < 0) {
1710 perror("snprintf modprobe");
1711 goto error;
1712 }
ab147185 1713 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1714 ret = system(modprobe);
ab147185
MD		 1715 if (ret == -1) {
1716 ERR("Unable to launch modprobe for module %s",
1717 kernel_modules_list[i].name);
1718 } else if (kernel_modules_list[i].required
d9800920 1719 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1720 ERR("Unable to load module %s",
1721 kernel_modules_list[i].name);
1722 } else {
1723 DBG("Modprobe successfully %s",
1724 kernel_modules_list[i].name);
1725 }
1726 }
1727
1728error:
1729 return ret;
1730}
1731
b73401da 1732/*
d063d709 1733 * mount_debugfs
b73401da
DG		 1734 */
1735static int mount_debugfs(char *path)
1736{
1737 int ret;
1738 char *type = "debugfs";
1739
996b65c8 1740 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1741 if (ret < 0) {
7272acf5 1742 PERROR("Cannot create debugfs path");
b73401da
DG		 1743 goto error;
1744 }
1745
1746 ret = mount(type, path, type, 0, NULL);
1747 if (ret < 0) {
7272acf5 1748 PERROR("Cannot mount debugfs");
b73401da
DG		 1749 goto error;
1750 }
1751
1752 DBG("Mounted debugfs successfully at %s", path);
1753
1754error:
1755 return ret;
1756}
1757
8c0faa1d 1758/*
d063d709 1759 * Setup necessary data for kernel tracer action.
8c0faa1d 1760 */
f3ed775e 1761static void init_kernel_tracer(void)
8c0faa1d 1762{
b73401da
DG		 1763 int ret;
1764 char *proc_mounts = "/proc/mounts";
1765 char line[256];
684d34d2 1766 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1767 FILE *fp;
1768
1769 /* Detect debugfs */
1770 fp = fopen(proc_mounts, "r");
1771 if (fp == NULL) {
1772 ERR("Unable to probe %s", proc_mounts);
1773 goto error;
1774 }
1775
1776 while (fgets(line, sizeof(line), fp) != NULL) {
1777 if (strstr(line, "debugfs") != NULL) {
1778 /* Remove first string */
1779 strtok(line, " ");
1780 /* Dup string here so we can reuse line later on */
1781 debugfs_path = strdup(strtok(NULL, " "));
1782 DBG("Got debugfs path : %s", debugfs_path);
1783 break;
1784 }
1785 }
1786
1787 fclose(fp);
1788
1789 /* Mount debugfs if needded */
1790 if (debugfs_path == NULL) {
1791 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1792 if (ret < 0) {
1793 perror("asprintf debugfs path");
1794 goto error;
1795 }
1796 ret = mount_debugfs(debugfs_path);
1797 if (ret < 0) {
7272acf5 1798 perror("Cannot mount debugfs");
b73401da
DG		 1799 goto error;
1800 }
1801 }
1802
1803 /* Modprobe lttng kernel modules */
1804 ret = modprobe_kernel_modules();
1805 if (ret < 0) {
1806 goto error;
1807 }
1808
1809 /* Setup lttng kernel path */
1810 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1811 if (ret < 0) {
1812 perror("asprintf lttng path");
1813 goto error;
1814 }
1815
1816 /* Open debugfs lttng */
1817 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1818 if (kernel_tracer_fd < 0) {
b73401da
DG		 1819 DBG("Failed to open %s", lttng_path);
1820 goto error;
8c0faa1d
DG		 1821 }
1822
b73401da
DG		 1823 free(lttng_path);
1824 free(debugfs_path);
f3ed775e 1825 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1826 return;
1827
1828error:
1829 if (lttng_path) {
1830 free(lttng_path);
1831 }
1832 if (debugfs_path) {
1833 free(debugfs_path);
1834 }
1835 WARN("No kernel tracer available");
1836 kernel_tracer_fd = 0;
1837 return;
f3ed775e 1838}
33a2b854 1839
f3ed775e 1840/*
54d01ffb 1841 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1842 */
54d01ffb 1843static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1844{
f40799e8 1845 int ret = 0;
8c0faa1d 1846
3bd1e081 1847 if (session->consumer_fds_sent == 0) {
d9800920 1848 /*
54d01ffb
DG		 1849 * Assign default kernel consumer socket if no consumer assigned to the
1850 * kernel session. At this point, it's NOT suppose to be 0 but this is
1851 * an extra security check.
d9800920
DG		 1852 */
1853 if (session->consumer_fd == 0) {
3bd1e081 1854 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1855 }
1856
2bdd86d4 1857 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1858 if (ret < 0) {
f3ed775e
DG		 1859 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1860 goto error;
1861 }
1d4b027a 1862
3bd1e081 1863 session->consumer_fds_sent = 1;
f3ed775e 1864 }
1d4b027a
DG		 1865
1866error:
1867 return ret;
8c0faa1d
DG		 1868}
1869
0177d773
DG		 1870/*
1871 * Create an UST session and add it to the session ust list.
1872 */
44d3bd01
DG		 1873static int create_ust_session(struct ltt_session *session,
1874 struct lttng_domain *domain)
0177d773 1875{
44d3bd01 1876 int ret;
48842b30 1877 unsigned int uid;
13384287 1878 struct ltt_ust_session *lus = NULL;
44d3bd01
DG		 1879
1880 switch (domain->type) {
48842b30 1881 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1882 break;
1883 default:
13384287 1884 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1885 goto error;
1886 }
0177d773
DG		 1887
1888 DBG("Creating UST session");
1889
44e96653 1890 uid = session->uid;
48842b30 1891 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1892 if (lus == NULL) {
44d3bd01 1893 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1894 goto error;
1895 }
1896
48842b30 1897 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG		 1898 geteuid(), allowed_group());
1899 if (ret < 0) {
1900 if (ret != -EEXIST) {
1901 ERR("Trace directory creation error");
44d3bd01 1902 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1903 goto error;
1904 }
1905 }
1906
f6a9efaa
DG		 1907 /* The domain type dictate different actions on session creation */
1908 switch (domain->type) {
48842b30
DG		 1909 case LTTNG_DOMAIN_UST:
1910 /* No ustctl for the global UST domain */
1911 break;
1912 default:
36dc12cc 1913 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1914 goto error;
0177d773 1915 }
f6a9efaa 1916 session->ust_session = lus;
44d3bd01
DG		 1917
1918 return LTTCOMM_OK;
0177d773
DG		 1919
1920error:
1921 free(lus);
1922 return ret;
1923}
1924
333f285e 1925/*
d063d709 1926 * Create a kernel tracer session then create the default channel.
333f285e 1927 */
f3ed775e 1928static int create_kernel_session(struct ltt_session *session)
333f285e 1929{
f3ed775e 1930 int ret;
f3ed775e
DG		 1931
1932 DBG("Creating kernel session");
1933
1934 ret = kernel_create_session(session, kernel_tracer_fd);
1935 if (ret < 0) {
1936 ret = LTTCOMM_KERN_SESS_FAIL;
1937 goto error;
333f285e
DG		 1938 }
1939
d9800920 1940 /* Set kernel consumer socket fd */
3bd1e081
MD		 1941 if (kconsumer_data.cmd_sock) {
1942 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1943 }
1944
63053e7c
DG		 1945 ret = mkdir_recursive(session->kernel_session->trace_path,
1946 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1947 if (ret < 0) {
996b65c8 1948 if (ret != -EEXIST) {
7a485870
DG		 1949 ERR("Trace directory creation error");
1950 goto error;
1951 }
1952 }
1953
f3ed775e
DG		 1954error:
1955 return ret;
333f285e
DG		 1956}
1957
6c9cc2ab
DG		 1958/*
1959 * Using the session list, filled a lttng_session array to send back to the
1960 * client for session listing.
1961 *
1962 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1963 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG		 1964 */
1965static void list_lttng_sessions(struct lttng_session *sessions)
1966{
1967 int i = 0;
1968 struct ltt_session *session;
1969
1970 DBG("Getting all available session");
1971 /*
1972 * Iterate over session list and append data after the control struct in
1973 * the buffer.
1974 */
1975 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1976 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1977 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1978 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1979 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1980 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1981 i++;
1982 }
1983}
1984
9f19cc17
DG		 1985/*
1986 * Fill lttng_channel array of all channels.
1987 */
b551a063 1988static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1989 struct lttng_channel *channels)
1990{
1991 int i = 0;
1992 struct ltt_kernel_channel *kchan;
1993
1994 DBG("Listing channels for session %s", session->name);
1995
b551a063
DG		 1996 switch (domain) {
1997 case LTTNG_DOMAIN_KERNEL:
1998 /* Kernel channels */
1999 if (session->kernel_session != NULL) {
2000 cds_list_for_each_entry(kchan,
2001 &session->kernel_session->channel_list.head, list) {
2002 /* Copy lttng_channel struct to array */
2003 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2004 channels[i].enabled = kchan->enabled;
2005 i++;
2006 }
2007 }
2008 break;
2009 case LTTNG_DOMAIN_UST:
2010 {
2011 struct cds_lfht_iter iter;
2012 struct ltt_ust_channel *uchan;
2013
2014 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2015 &iter, uchan, node) {
2016 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2017 channels[i].attr.overwrite = uchan->attr.overwrite;
2018 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2019 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2020 channels[i].attr.switch_timer_interval =
2021 uchan->attr.switch_timer_interval;
2022 channels[i].attr.read_timer_interval =
2023 uchan->attr.read_timer_interval;
aea829b3 2024 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2025 switch (uchan->attr.output) {
2026 case LTTNG_UST_MMAP:
2027 default:
2028 channels[i].attr.output = LTTNG_EVENT_MMAP;
2029 break;
2030 }
befe0905 2031 i++;
b551a063
DG		 2032 }
2033 break;
2034 }
2035 default:
2036 break;
2037 }
2038}
2039
2040/*
2041 * Create a list of ust global domain events.
2042 */
2043static int list_lttng_ust_global_events(char *channel_name,
2044 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2045{
2046 int i = 0, ret = 0;
2047 unsigned int nb_event = 0;
2048 struct cds_lfht_iter iter;
d7b75b30 2049 struct cds_lfht_node *node;
b551a063
DG		 2050 struct ltt_ust_channel *uchan;
2051 struct ltt_ust_event *uevent;
2052 struct lttng_event *tmp;
2053
2054 DBG("Listing UST global events for channel %s", channel_name);
2055
2056 rcu_read_lock();
2057
d7b75b30
DG		 2058 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2059 strlen(channel_name), &iter);
2060 if (node == NULL) {
2061 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2062 goto error;
b551a063
DG		 2063 }
2064
d7b75b30
DG		 2065 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2066
2067 nb_event += hashtable_get_count(uchan->events);
2068
b551a063
DG		 2069 if (nb_event == 0) {
2070 ret = nb_event;
2071 goto error;
2072 }
2073
2074 DBG3("Listing UST global %d events", nb_event);
2075
2076 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2077 if (tmp == NULL) {
2078 ret = -LTTCOMM_FATAL;
2079 goto error;
2080 }
2081
d7b75b30
DG		 2082 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2083 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2084 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2085 tmp[i].enabled = uevent->enabled;
2086 switch (uevent->attr.instrumentation) {
2087 case LTTNG_UST_TRACEPOINT:
2088 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2089 break;
2090 case LTTNG_UST_PROBE:
2091 tmp[i].type = LTTNG_EVENT_PROBE;
2092 break;
2093 case LTTNG_UST_FUNCTION:
2094 tmp[i].type = LTTNG_EVENT_FUNCTION;
2095 break;
ac3bd9c0 2096 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2097 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2098 break;
9f19cc17 2099 }
d7b75b30 2100 i++;
9f19cc17
DG		 2101 }
2102
b551a063
DG		 2103 ret = nb_event;
2104 *events = tmp;
2105
2106error:
2107 rcu_read_unlock();
2108 return ret;
9f19cc17
DG		 2109}
2110
2111/*
b551a063 2112 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2113 */
b551a063
DG		 2114static int list_lttng_kernel_events(char *channel_name,
2115 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2116{
b551a063
DG		 2117 int i = 0, ret;
2118 unsigned int nb_event;
9f19cc17 2119 struct ltt_kernel_event *event;
b551a063
DG		 2120 struct ltt_kernel_channel *kchan;
2121
2122 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2123 if (kchan == NULL) {
2124 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2125 goto error;
2126 }
2127
2128 nb_event = kchan->event_count;
9f19cc17
DG		 2129
2130 DBG("Listing events for channel %s", kchan->channel->name);
2131
b551a063
DG		 2132 if (nb_event == 0) {
2133 ret = nb_event;
2134 goto error;
2135 }
2136
2137 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2138 if (*events == NULL) {
2139 ret = LTTCOMM_FATAL;
2140 goto error;
2141 }
2142
9f19cc17
DG		 2143 /* Kernel channels */
2144 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2145 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2146 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2147 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2148 switch (event->event->instrumentation) {
2149 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2150 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2151 break;
2152 case LTTNG_KERNEL_KPROBE:
2153 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2154 (*events)[i].type = LTTNG_EVENT_PROBE;
2155 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2156 sizeof(struct lttng_kernel_kprobe));
2157 break;
2158 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2159 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2160 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2161 sizeof(struct lttng_kernel_function));
2162 break;
0133c199 2163 case LTTNG_KERNEL_NOOP:
b551a063 2164 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2165 break;
a54bd42d 2166 case LTTNG_KERNEL_SYSCALL:
b551a063 2167 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2168 break;
7a3d1328
MD		 2169 case LTTNG_KERNEL_ALL:
2170 assert(0);
2171 break;
9f19cc17
DG		 2172 }
2173 i++;
2174 }
b551a063
DG		 2175
2176 return nb_event;
2177
2178error:
2179 return ret;
9f19cc17
DG		 2180}
2181
fac6795d 2182/*
54d01ffb 2183 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2184 */
54d01ffb
DG		 2185static int cmd_disable_channel(struct ltt_session *session,
2186 int domain, char *channel_name)
fac6795d 2187{
54d01ffb 2188 int ret;
78f0bacd
DG		 2189 struct ltt_ust_session *usess;
2190
2191 usess = session->ust_session;
379473d2 2192
54d01ffb 2193 switch (domain) {
78f0bacd
DG		 2194 case LTTNG_DOMAIN_KERNEL:
2195 {
2196 ret = channel_kernel_disable(session->kernel_session,
2197 channel_name);
2198 if (ret != LTTCOMM_OK) {
2199 goto error;
2200 }
54d01ffb 2201
78f0bacd
DG		 2202 kernel_wait_quiescent(kernel_tracer_fd);
2203 break;
2204 }
2205 case LTTNG_DOMAIN_UST:
2206 {
2207 struct ltt_ust_channel *uchan;
7885e399 2208 struct cds_lfht *chan_ht;
78f0bacd 2209
7885e399
DG		 2210 chan_ht = usess->domain_global.channels;
2211
2212 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2213 if (uchan == NULL) {
2214 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2215 goto error;
78f0bacd
DG		 2216 }
2217
7885e399
DG		 2218 ret = channel_ust_disable(usess, domain, uchan);
2219 if (ret != LTTCOMM_OK) {
78f0bacd
DG		 2220 goto error;
2221 }
78f0bacd
DG		 2222 break;
2223 }
2224 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2225 case LTTNG_DOMAIN_UST_EXEC_NAME:
2226 case LTTNG_DOMAIN_UST_PID:
2227 ret = LTTCOMM_NOT_IMPLEMENTED;
2228 goto error;
2229 default:
2230 ret = LTTCOMM_UNKNOWN_DOMAIN;
2231 goto error;
20fe2104
DG		 2232 }
2233
54d01ffb 2234 ret = LTTCOMM_OK;
d65106b1 2235
54d01ffb
DG		 2236error:
2237 return ret;
2238}
2239
2240/*
2241 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2242 */
44d3bd01 2243static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2244 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2245{
2246 int ret;
f6a9efaa 2247 struct ltt_ust_session *usess = session->ust_session;
7885e399 2248 struct cds_lfht *chan_ht;
f6a9efaa 2249
5d56b5aa 2250 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2251
aea829b3 2252 switch (domain) {
44d3bd01
DG		 2253 case LTTNG_DOMAIN_KERNEL:
2254 {
2255 struct ltt_kernel_channel *kchan;
54d01ffb 2256
44d3bd01
DG		 2257 kchan = trace_kernel_get_channel_by_name(attr->name,
2258 session->kernel_session);
2259 if (kchan == NULL) {
2260 ret = channel_kernel_create(session->kernel_session,
2261 attr, kernel_poll_pipe[1]);
2262 } else {
2263 ret = channel_kernel_enable(session->kernel_session, kchan);
2264 }
2265
2266 if (ret != LTTCOMM_OK) {
2267 goto error;
2268 }
2269
2270 kernel_wait_quiescent(kernel_tracer_fd);
2271 break;
2272 }
f6a9efaa
DG		 2273 case LTTNG_DOMAIN_UST:
2274 {
2275 struct ltt_ust_channel *uchan;
2276
7885e399 2277 chan_ht = usess->domain_global.channels;
f6a9efaa 2278
7885e399 2279 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2280 if (uchan == NULL) {
7885e399 2281 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2282 } else {
7885e399 2283 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2284 }
f6a9efaa
DG		 2285 break;
2286 }
78f0bacd
DG		 2287 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2288 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2289 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG		 2290 ret = LTTCOMM_NOT_IMPLEMENTED;
2291 goto error;
44d3bd01
DG		 2292 default:
2293 ret = LTTCOMM_UNKNOWN_DOMAIN;
2294 goto error;
54d01ffb
DG		 2295 }
2296
54d01ffb
DG		 2297error:
2298 return ret;
2299}
2300
2301/*
2302 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2303 */
2304static int cmd_disable_event(struct ltt_session *session, int domain,
2305 char *channel_name, char *event_name)
2306{
2307 int ret;
54d01ffb
DG		 2308
2309 switch (domain) {
2310 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2311 {
2312 struct ltt_kernel_channel *kchan;
b0a40d28 2313 struct ltt_kernel_session *ksess;
2bdd86d4 2314
b0a40d28
DG		 2315 ksess = session->kernel_session;
2316
2317 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2318 if (kchan == NULL) {
2319 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2320 goto error;
d65106b1
DG		 2321 }
2322
b0a40d28 2323 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2324 if (ret != LTTCOMM_OK) {
2325 goto error;
2326 }
2327
2328 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2329 break;
2bdd86d4
MD		 2330 }
2331 case LTTNG_DOMAIN_UST:
b0a40d28 2332 {
b0a40d28 2333 struct ltt_ust_channel *uchan;
7f79d3a1 2334 struct ltt_ust_session *usess;
b0a40d28
DG		 2335
2336 usess = session->ust_session;
2337
2338 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2339 channel_name);
2340 if (uchan == NULL) {
2341 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2342 goto error;
2343 }
2344
7f79d3a1
DG		 2345 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2346 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2347 goto error;
2348 }
2349
7f79d3a1 2350 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2351 channel_name);
b0a40d28
DG		 2352 break;
2353 }
2bdd86d4
MD		 2354 case LTTNG_DOMAIN_UST_EXEC_NAME:
2355 case LTTNG_DOMAIN_UST_PID:
2356 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2357 default:
54d01ffb
DG		 2358 ret = LTTCOMM_NOT_IMPLEMENTED;
2359 goto error;
d65106b1 2360 }
26cc6b4e 2361
54d01ffb
DG		 2362 ret = LTTCOMM_OK;
2363
2364error:
2365 return ret;
2366}
2367
2368/*
2369 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2370 */
2371static int cmd_disable_event_all(struct ltt_session *session, int domain,
2372 char *channel_name)
2373{
2374 int ret;
54d01ffb
DG		 2375
2376 switch (domain) {
2377 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2378 {
2379 struct ltt_kernel_session *ksess;
2380 struct ltt_kernel_channel *kchan;
2381
2382 ksess = session->kernel_session;
2383
2384 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2385 if (kchan == NULL) {
2386 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2387 goto error;
26cc6b4e
DG		 2388 }
2389
9730260e 2390 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2391 if (ret != LTTCOMM_OK) {
0b97ec54 2392 goto error;
26cc6b4e
DG		 2393 }
2394
54d01ffb 2395 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2396 break;
9730260e
DG		 2397 }
2398 case LTTNG_DOMAIN_UST:
2399 {
2400 struct ltt_ust_session *usess;
2401 struct ltt_ust_channel *uchan;
2402
2403 usess = session->ust_session;
2404
2405 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2406 channel_name);
2407 if (uchan == NULL) {
2408 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2409 goto error;
2410 }
2411
7f79d3a1
DG		 2412 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2413 if (ret != 0) {
9730260e
DG		 2414 goto error;
2415 }
2416
7f79d3a1 2417 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2418
2419 break;
2420 }
2421 case LTTNG_DOMAIN_UST_EXEC_NAME:
2422 case LTTNG_DOMAIN_UST_PID:
2423 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2424 default:
54d01ffb
DG		 2425 ret = LTTCOMM_NOT_IMPLEMENTED;
2426 goto error;
26cc6b4e 2427 }
e953ef25 2428
54d01ffb 2429 ret = LTTCOMM_OK;
e953ef25 2430
54d01ffb
DG		 2431error:
2432 return ret;
2433}
f5177a38 2434
54d01ffb
DG		 2435/*
2436 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2437 */
2438static int cmd_add_context(struct ltt_session *session, int domain,
2439 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2440{
2441 int ret;
f5177a38 2442
54d01ffb
DG		 2443 switch (domain) {
2444 case LTTNG_DOMAIN_KERNEL:
2445 /* Add kernel context to kernel tracer */
2446 ret = context_kernel_add(session->kernel_session, ctx,
2447 event_name, channel_name);
2448 if (ret != LTTCOMM_OK) {
f5177a38 2449 goto error;
e953ef25 2450 }
2bdd86d4
MD		 2451 break;
2452 case LTTNG_DOMAIN_UST:
2453 {
55cc08a6 2454 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2455
55cc08a6
DG		 2456 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2457 if (ret != LTTCOMM_OK) {
2458 goto error;
2bdd86d4 2459 }
e953ef25 2460 break;
2bdd86d4 2461 }
55cc08a6
DG		 2462 case LTTNG_DOMAIN_UST_EXEC_NAME:
2463 case LTTNG_DOMAIN_UST_PID:
2464 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2465 default:
54d01ffb
DG		 2466 ret = LTTCOMM_NOT_IMPLEMENTED;
2467 goto error;
e953ef25 2468 }
950131af 2469
54d01ffb 2470 ret = LTTCOMM_OK;
950131af 2471
54d01ffb
DG		 2472error:
2473 return ret;
2474}
2475
2476/*
2477 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD		 2478 *
2479 * TODO: currently, both events and loglevels are kept within the same
2480 * namespace for UST global registry/app registery, so if an event
2481 * happen to have the same name as the loglevel (very unlikely though),
2482 * and an attempt is made to enable/disable both in the same session,
2483 * the first to be created will be the only one allowed to exist.
54d01ffb
DG		 2484 */
2485static int cmd_enable_event(struct ltt_session *session, int domain,
2486 char *channel_name, struct lttng_event *event)
2487{
2488 int ret;
f6cd6b0f 2489 struct lttng_channel *attr;
48842b30 2490 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2491
2492 switch (domain) {
2493 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2494 {
2495 struct ltt_kernel_channel *kchan;
2496
54d01ffb
DG		 2497 kchan = trace_kernel_get_channel_by_name(channel_name,
2498 session->kernel_session);
2499 if (kchan == NULL) {
f6cd6b0f
DG		 2500 attr = channel_new_default_attr(domain);
2501 if (attr == NULL) {
2502 ret = LTTCOMM_FATAL;
2503 goto error;
2504 }
2505 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2506
54d01ffb 2507 /* This call will notify the kernel thread */
44d3bd01 2508 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2509 attr, kernel_poll_pipe[1]);
54d01ffb 2510 if (ret != LTTCOMM_OK) {
ff4d74e6 2511 free(attr);
f5177a38
DG		 2512 goto error;
2513 }
ff4d74e6 2514 free(attr);
54d01ffb 2515 }
950131af 2516
54d01ffb
DG		 2517 /* Get the newly created kernel channel pointer */
2518 kchan = trace_kernel_get_channel_by_name(channel_name,
2519 session->kernel_session);
2520 if (kchan == NULL) {
2521 /* This sould not happen... */
2522 ret = LTTCOMM_FATAL;
2523 goto error;
2524 }
f5177a38 2525
48842b30
DG		 2526 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2527 event);
54d01ffb 2528 if (ret != LTTCOMM_OK) {
f5177a38 2529 goto error;
950131af
DG		 2530 }
2531
54d01ffb 2532 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2533 break;
2bdd86d4
MD		 2534 }
2535 case LTTNG_DOMAIN_UST:
2536 {
aea829b3 2537 struct lttng_channel *attr;
edb67388 2538 struct ltt_ust_channel *uchan;
2bdd86d4 2539
edb67388 2540 /* Get channel from global UST domain */
48842b30
DG		 2541 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2542 channel_name);
2543 if (uchan == NULL) {
aea829b3
DG		 2544 /* Create default channel */
2545 attr = channel_new_default_attr(domain);
2546 if (attr == NULL) {
2547 ret = LTTCOMM_FATAL;
2548 goto error;
2549 }
596219f7 2550 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2551 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2552
7885e399 2553 ret = channel_ust_create(usess, domain, attr);
edb67388 2554 if (ret != LTTCOMM_OK) {
ff4d74e6 2555 free(attr);
aea829b3
DG		 2556 goto error;
2557 }
aea829b3
DG		 2558 free(attr);
2559
2560 /* Get the newly created channel reference back */
2561 uchan = trace_ust_find_channel_by_name(
2562 usess->domain_global.channels, channel_name);
2563 if (uchan == NULL) {
2564 /* Something is really wrong */
2565 ret = LTTCOMM_FATAL;
2566 goto error;
2567 }
48842b30 2568 }
2bdd86d4 2569
edb67388 2570 /* At this point, the session and channel exist on the tracer */
d5cd1f34 2571
edb67388
DG		 2572 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2573 if (ret != LTTCOMM_OK) {
48842b30 2574 goto error;
2bdd86d4
MD		 2575 }
2576 break;
2577 }
2578 case LTTNG_DOMAIN_UST_EXEC_NAME:
2579 case LTTNG_DOMAIN_UST_PID:
2580 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2581 default:
54d01ffb
DG		 2582 ret = LTTCOMM_NOT_IMPLEMENTED;
2583 goto error;
950131af 2584 }
d36b8583 2585
54d01ffb 2586 ret = LTTCOMM_OK;
d36b8583 2587
54d01ffb
DG		 2588error:
2589 return ret;
2590}
7d29a247 2591
54d01ffb
DG		 2592/*
2593 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2594 */
2595static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2596 char *channel_name, int event_type)
54d01ffb
DG		 2597{
2598 int ret;
2599 struct ltt_kernel_channel *kchan;
7d29a247 2600
54d01ffb
DG		 2601 switch (domain) {
2602 case LTTNG_DOMAIN_KERNEL:
2603 kchan = trace_kernel_get_channel_by_name(channel_name,
2604 session->kernel_session);
2605 if (kchan == NULL) {
2606 /* This call will notify the kernel thread */
44d3bd01
DG		 2607 ret = channel_kernel_create(session->kernel_session, NULL,
2608 kernel_poll_pipe[1]);
54d01ffb
DG		 2609 if (ret != LTTCOMM_OK) {
2610 goto error;
d36b8583 2611 }
0d0c377a 2612
8f69e5eb
DG		 2613 /* Get the newly created kernel channel pointer */
2614 kchan = trace_kernel_get_channel_by_name(channel_name,
2615 session->kernel_session);
2616 if (kchan == NULL) {
2617 /* This sould not happen... */
2618 ret = LTTCOMM_FATAL;
2619 goto error;
2620 }
2621
54d01ffb 2622 }
0fdd1e2c 2623
7a3d1328 2624 switch (event_type) {
76d45b40 2625 case LTTNG_EVENT_SYSCALL:
7a3d1328 2626 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2627 kchan, kernel_tracer_fd);
7a3d1328 2628 break;
76d45b40 2629 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2630 /*
7a3d1328
MD		 2631 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2632 * events already registered to the channel.
8c9ae521 2633 */
7a3d1328
MD		 2634 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2635 kchan, kernel_tracer_fd);
2636 break;
76d45b40 2637 case LTTNG_EVENT_ALL:
7a3d1328 2638 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2639 ret = event_kernel_enable_all(session->kernel_session,
2640 kchan, kernel_tracer_fd);
7a3d1328
MD		 2641 break;
2642 default:
2643 ret = LTTCOMM_KERN_ENABLE_FAIL;
2644 goto error;
8c9ae521 2645 }
8f69e5eb
DG		 2646
2647 /* Manage return value */
54d01ffb 2648 if (ret != LTTCOMM_OK) {
0d0c377a 2649 goto error;
d36b8583
DG		 2650 }
2651
54d01ffb 2652 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2653 break;
76d45b40
DG		 2654 case LTTNG_DOMAIN_UST:
2655 {
2656 struct lttng_channel *attr;
2657 struct ltt_ust_channel *uchan;
2658 struct ltt_ust_session *usess = session->ust_session;
2659
2660 /* Get channel from global UST domain */
2661 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2662 channel_name);
2663 if (uchan == NULL) {
2664 /* Create default channel */
2665 attr = channel_new_default_attr(domain);
2666 if (attr == NULL) {
2667 ret = LTTCOMM_FATAL;
2668 goto error;
2669 }
2670 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2671 attr->name[NAME_MAX - 1] = '\0';
2672
2673 /* Use the internal command enable channel */
7885e399 2674 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2675 if (ret != LTTCOMM_OK) {
2676 free(attr);
2677 goto error;
2678 }
2679 free(attr);
2680
2681 /* Get the newly created channel reference back */
2682 uchan = trace_ust_find_channel_by_name(
2683 usess->domain_global.channels, channel_name);
2684 if (uchan == NULL) {
2685 /* Something is really wrong */
2686 ret = LTTCOMM_FATAL;
2687 goto error;
2688 }
2689 }
2690
2691 /* At this point, the session and channel exist on the tracer */
2692
2693 switch (event_type) {
2694 case LTTNG_EVENT_ALL:
2695 case LTTNG_EVENT_TRACEPOINT:
2696 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2697 if (ret != LTTCOMM_OK) {
2698 goto error;
2699 }
2700 break;
2701 default:
2702 ret = LTTCOMM_UST_ENABLE_FAIL;
2703 goto error;
2704 }
2705
2706 /* Manage return value */
2707 if (ret != LTTCOMM_OK) {
2708 goto error;
2709 }
2710
2711 break;
2712 }
2713 case LTTNG_DOMAIN_UST_EXEC_NAME:
2714 case LTTNG_DOMAIN_UST_PID:
2715 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2716 default:
54d01ffb
DG		 2717 ret = LTTCOMM_NOT_IMPLEMENTED;
2718 goto error;
d36b8583 2719 }
f3ed775e 2720
54d01ffb
DG		 2721 ret = LTTCOMM_OK;
2722
2723error:
2724 return ret;
2725}
2726
2727/*
2728 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2729 */
2730static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2731{
2732 int ret;
2733 ssize_t nb_events = 0;
2734
2735 switch (domain) {
2736 case LTTNG_DOMAIN_KERNEL:
2737 nb_events = kernel_list_events(kernel_tracer_fd, events);
2738 if (nb_events < 0) {
2739 ret = LTTCOMM_KERN_LIST_FAIL;
2740 goto error;
894be886 2741 }
54d01ffb 2742 break;
b551a063
DG		 2743 case LTTNG_DOMAIN_UST:
2744 nb_events = ust_app_list_events(events);
2745 if (nb_events < 0) {
2746 ret = LTTCOMM_UST_LIST_FAIL;
2747 goto error;
2748 }
2749 break;
54d01ffb 2750 default:
54d01ffb
DG		 2751 ret = LTTCOMM_NOT_IMPLEMENTED;
2752 goto error;
2753 }
894be886 2754
54d01ffb 2755 return nb_events;
7d29a247 2756
54d01ffb
DG		 2757error:
2758 /* Return negative value to differentiate return code */
2759 return -ret;
2760}
b389abbe 2761
54d01ffb
DG		 2762/*
2763 * Command LTTNG_START_TRACE processed by the client thread.
2764 */
2765static int cmd_start_trace(struct ltt_session *session)
2766{
2767 int ret;
54d01ffb 2768 struct ltt_kernel_session *ksession;
b9d9b220 2769 struct ltt_ust_session *usess;
b389abbe 2770
54d01ffb
DG		 2771 /* Short cut */
2772 ksession = session->kernel_session;
b9d9b220 2773 usess = session->ust_session;
5eb91c98 2774
464dd62d
MD		 2775 if (session->enabled)
2776 return LTTCOMM_UST_START_FAIL;
2777 session->enabled = 1;
2778
54d01ffb
DG		 2779 /* Kernel tracing */
2780 if (ksession != NULL) {
2bdd86d4
MD		 2781 struct ltt_kernel_channel *kchan;
2782
54d01ffb
DG		 2783 /* Open kernel metadata */
2784 if (ksession->metadata == NULL) {
2785 ret = kernel_open_metadata(ksession, ksession->trace_path);
2786 if (ret < 0) {
2787 ret = LTTCOMM_KERN_META_FAIL;
2788 goto error;
b389abbe 2789 }
54d01ffb 2790 }
7d29a247 2791
54d01ffb
DG		 2792 /* Open kernel metadata stream */
2793 if (ksession->metadata_stream_fd == 0) {
2794 ret = kernel_open_metadata_stream(ksession);
2795 if (ret < 0) {
2796 ERR("Kernel create metadata stream failed");
2797 ret = LTTCOMM_KERN_STREAM_FAIL;
2798 goto error;
2799 }
2800 }
2801
2802 /* For each channel */
2803 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2804 if (kchan->stream_count == 0) {
2805 ret = kernel_open_channel_stream(kchan);
2806 if (ret < 0) {
2807 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2808 goto error;
2809 }
54d01ffb
DG		 2810 /* Update the stream global counter */
2811 ksession->stream_count_global += ret;
7d29a247 2812 }
54d01ffb
DG		 2813 }
2814
2815 /* Setup kernel consumer socket and send fds to it */
2816 ret = init_kernel_tracing(ksession);
2817 if (ret < 0) {
2818 ret = LTTCOMM_KERN_START_FAIL;
2819 goto error;
2820 }
2821
2822 /* This start the kernel tracing */
2823 ret = kernel_start_session(ksession);
2824 if (ret < 0) {
2825 ret = LTTCOMM_KERN_START_FAIL;
2826 goto error;
2827 }
2828
2829 /* Quiescent wait after starting trace */
2830 kernel_wait_quiescent(kernel_tracer_fd);
2831 }
2832
36dc12cc 2833 /* Flag session that trace should start automatically */
b9d9b220
DG		 2834 if (usess) {
2835 usess->start_trace = 1;
36dc12cc 2836
b9d9b220
DG		 2837 ret = ust_app_start_trace_all(usess);
2838 if (ret < 0) {
2839 ret = LTTCOMM_UST_START_FAIL;
2840 goto error;
2841 }
2bdd86d4 2842 }
54d01ffb
DG		 2843
2844 ret = LTTCOMM_OK;
2845
2846error:
2847 return ret;
2848}
2849
2850/*
2851 * Command LTTNG_STOP_TRACE processed by the client thread.
2852 */
2853static int cmd_stop_trace(struct ltt_session *session)
2854{
2855 int ret;
2856 struct ltt_kernel_channel *kchan;
2857 struct ltt_kernel_session *ksession;
8be98f9a 2858 struct ltt_ust_session *usess;
54d01ffb
DG		 2859
2860 /* Short cut */
2861 ksession = session->kernel_session;
8be98f9a 2862 usess = session->ust_session;
54d01ffb 2863
464dd62d
MD		 2864 if (!session->enabled)
2865 return LTTCOMM_UST_START_FAIL;
2866 session->enabled = 0;
2867
54d01ffb
DG		 2868 /* Kernel tracer */
2869 if (ksession != NULL) {
2870 DBG("Stop kernel tracing");
2871
2872 /* Flush all buffers before stopping */
2873 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2874 if (ret < 0) {
2875 ERR("Kernel metadata flush failed");
2876 }
f34daff7 2877
54d01ffb
DG		 2878 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2879 ret = kernel_flush_buffer(kchan);
0d0c377a 2880 if (ret < 0) {
54d01ffb 2881 ERR("Kernel flush buffer error");
7d29a247 2882 }
54d01ffb 2883 }
19e70852 2884
54d01ffb
DG		 2885 ret = kernel_stop_session(ksession);
2886 if (ret < 0) {
2887 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2888 goto error;
f3ed775e 2889 }
54d01ffb
DG		 2890
2891 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2892 }
54d01ffb 2893
8be98f9a
MD		 2894 if (usess) {
2895 usess->start_trace = 0;
2bdd86d4 2896
8be98f9a 2897 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2898 if (ret < 0) {
8be98f9a 2899 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD		 2900 goto error;
2901 }
2bdd86d4 2902 }
54d01ffb
DG		 2903
2904 ret = LTTCOMM_OK;
2905
2906error:
2907 return ret;
2908}
2909
2910/*
2911 * Command LTTNG_CREATE_SESSION processed by the client thread.
2912 */
2913static int cmd_create_session(char *name, char *path)
2914{
2915 int ret;
2916
2917 ret = session_create(name, path);
2918 if (ret != LTTCOMM_OK) {
2919 goto error;
2920 }
2921
2922 ret = LTTCOMM_OK;
2923
2924error:
2925 return ret;
2926}
2927
2928/*
2929 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2930 */
2931static int cmd_destroy_session(struct ltt_session *session, char *name)
2932{
2933 int ret;
2934
2935 /* Clean kernel session teardown */
2936 teardown_kernel_session(session);
84cd17c6
MD		 2937 /* UST session teardown */
2938 teardown_ust_session(session);
54d01ffb
DG		 2939
2940 /*
2941 * Must notify the kernel thread here to update it's poll setin order
2942 * to remove the channel(s)' fd just destroyed.
2943 */
2944 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2945 if (ret < 0) {
2946 perror("write kernel poll pipe");
2947 }
2948
271933a4 2949 ret = session_destroy(session);
54d01ffb
DG		 2950
2951 return ret;
2952}
2953
2954/*
2955 * Command LTTNG_CALIBRATE processed by the client thread.
2956 */
2957static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2958{
2959 int ret;
2960
2961 switch (domain) {
2962 case LTTNG_DOMAIN_KERNEL:
33a2b854 2963 {
54d01ffb 2964 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2965
54d01ffb
DG		 2966 kcalibrate.type = calibrate->type;
2967 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2968 if (ret < 0) {
54d01ffb
DG		 2969 ret = LTTCOMM_KERN_ENABLE_FAIL;
2970 goto error;
33a2b854 2971 }
54d01ffb
DG		 2972 break;
2973 }
2974 default:
2975 /* TODO: Userspace tracing */
2976 ret = LTTCOMM_NOT_IMPLEMENTED;
2977 goto error;
2978 }
33a2b854 2979
54d01ffb 2980 ret = LTTCOMM_OK;
33a2b854 2981
54d01ffb
DG		 2982error:
2983 return ret;
2984}
7d29a247 2985
54d01ffb
DG		 2986/*
2987 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2988 */
2989static int cmd_register_consumer(struct ltt_session *session, int domain,
2990 char *sock_path)
2991{
2992 int ret, sock;
b389abbe 2993
54d01ffb
DG		 2994 switch (domain) {
2995 case LTTNG_DOMAIN_KERNEL:
2996 /* Can't register a consumer if there is already one */
2997 if (session->kernel_session->consumer_fd != 0) {
2998 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2999 goto error;
3000 }
3001
3002 sock = lttcomm_connect_unix_sock(sock_path);
3003 if (sock < 0) {
3004 ret = LTTCOMM_CONNECT_FAIL;
3005 goto error;
3006 }
3007
3008 session->kernel_session->consumer_fd = sock;
3009 break;
3010 default:
3011 /* TODO: Userspace tracing */
3012 ret = LTTCOMM_NOT_IMPLEMENTED;
3013 goto error;
3014 }
3015
3016 ret = LTTCOMM_OK;
3017
3018error:
3019 return ret;
3020}
3021
3022/*
3023 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3024 */
3025static ssize_t cmd_list_domains(struct ltt_session *session,
3026 struct lttng_domain **domains)
3027{
b551a063 3028 int ret, index = 0;
54d01ffb
DG		 3029 ssize_t nb_dom = 0;
3030
3031 if (session->kernel_session != NULL) {
b551a063 3032 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3033 nb_dom++;
3034 }
3035
b551a063
DG		 3036 if (session->ust_session != NULL) {
3037 DBG3("Listing domains found UST global domain");
3038 nb_dom++;
3039 }
54d01ffb 3040
b551a063 3041 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3042 if (*domains == NULL) {
3043 ret = -LTTCOMM_FATAL;
3044 goto error;
3045 }
3046
b551a063
DG		 3047 if (session->kernel_session != NULL) {
3048 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3049 index++;
3050 }
3051
3052 if (session->ust_session != NULL) {
3053 (*domains)[index].type = LTTNG_DOMAIN_UST;
3054 index++;
3055 }
54d01ffb 3056
54d01ffb
DG		 3057 return nb_dom;
3058
3059error:
3060 return ret;
3061}
3062
3063/*
3064 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3065 */
b551a063 3066static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3067 struct lttng_channel **channels)
3068{
3069 int ret;
3070 ssize_t nb_chan = 0;
3071
b551a063
DG		 3072 switch (domain) {
3073 case LTTNG_DOMAIN_KERNEL:
3074 if (session->kernel_session != NULL) {
3075 nb_chan = session->kernel_session->channel_count;
3076 }
0df502fd 3077 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3078 break;
3079 case LTTNG_DOMAIN_UST:
3080 if (session->ust_session != NULL) {
3081 nb_chan = hashtable_get_count(
3082 session->ust_session->domain_global.channels);
3083 }
0df502fd 3084 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3085 break;
3086 default:
3087 *channels = NULL;
3088 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3089 goto error;
3090 }
3091
b551a063
DG		 3092 if (nb_chan > 0) {
3093 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3094 if (*channels == NULL) {
3095 ret = -LTTCOMM_FATAL;
3096 goto error;
3097 }
54d01ffb 3098
b551a063
DG		 3099 list_lttng_channels(domain, session, *channels);
3100 } else {
3101 *channels = NULL;
3102 }
2bdd86d4 3103
54d01ffb
DG		 3104 return nb_chan;
3105
3106error:
3107 return ret;
3108}
3109
3110/*
3111 * Command LTTNG_LIST_EVENTS processed by the client thread.
3112 */
b551a063 3113static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3114 char *channel_name, struct lttng_event **events)
3115{
b551a063 3116 int ret = 0;
54d01ffb 3117 ssize_t nb_event = 0;
54d01ffb 3118
b551a063
DG		 3119 switch (domain) {
3120 case LTTNG_DOMAIN_KERNEL:
3121 if (session->kernel_session != NULL) {
3122 nb_event = list_lttng_kernel_events(channel_name,
3123 session->kernel_session, events);
54d01ffb 3124 }
b551a063
DG		 3125 break;
3126 case LTTNG_DOMAIN_UST:
3127 {
3128 if (session->ust_session != NULL) {
3129 nb_event = list_lttng_ust_global_events(channel_name,
3130 &session->ust_session->domain_global, events);
3131 }
3132 break;
54d01ffb 3133 }
b551a063
DG		 3134 default:
3135 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3136 goto error;
3137 }
3138
b551a063 3139 ret = nb_event;
54d01ffb
DG		 3140
3141error:
3142 return ret;
3143}
3144
3145/*
3146 * Process the command requested by the lttng client within the command
3147 * context structure. This function make sure that the return structure (llm)
3148 * is set and ready for transmission before returning.
3149 *
3150 * Return any error encountered or 0 for success.
3151 */
3152static int process_client_msg(struct command_ctx *cmd_ctx)
3153{
3154 int ret = LTTCOMM_OK;
44d3bd01 3155 int need_tracing_session = 1;
54d01ffb
DG		 3156
3157 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3158
3159 /*
3160 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3161 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3162 * command.
3163 */
3164 switch(cmd_ctx->lsm->cmd_type) {
3165 case LTTNG_LIST_SESSIONS:
3166 case LTTNG_LIST_TRACEPOINTS:
3167 case LTTNG_LIST_DOMAINS:
3168 case LTTNG_LIST_CHANNELS:
3169 case LTTNG_LIST_EVENTS:
3170 break;
3171 default:
3172 /* Setup lttng message with no payload */
3173 ret = setup_lttng_msg(cmd_ctx, 0);
3174 if (ret < 0) {
3175 /* This label does not try to unlock the session */
3176 goto init_setup_error;
3177 }
3178 }
3179
3180 /* Commands that DO NOT need a session. */
3181 switch (cmd_ctx->lsm->cmd_type) {
3182 case LTTNG_CALIBRATE:
3183 case LTTNG_CREATE_SESSION:
3184 case LTTNG_LIST_SESSIONS:
3185 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3186 need_tracing_session = 0;
54d01ffb
DG		 3187 break;
3188 default:
3189 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3190 session_lock_list();
54d01ffb 3191 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3192 session_unlock_list();
54d01ffb
DG		 3193 if (cmd_ctx->session == NULL) {
3194 if (cmd_ctx->lsm->session.name != NULL) {
3195 ret = LTTCOMM_SESS_NOT_FOUND;
3196 } else {
3197 /* If no session name specified */
3198 ret = LTTCOMM_SELECT_SESS;
3199 }
3200 goto error;
3201 } else {
3202 /* Acquire lock for the session */
3203 session_lock(cmd_ctx->session);
3204 }
3205 break;
3206 }
b389abbe 3207
54d01ffb
DG		 3208 /*
3209 * Check domain type for specific "pre-action".
3210 */
3211 switch (cmd_ctx->lsm->domain.type) {
3212 case LTTNG_DOMAIN_KERNEL:
3213 /* Kernel tracer check */
3214 if (kernel_tracer_fd == 0) {
3215 /* Basically, load kernel tracer modules */
3216 init_kernel_tracer();
3217 if (kernel_tracer_fd == 0) {
3218 ret = LTTCOMM_KERN_NA;
3219 goto error;
3220 }
3221 }
5eb91c98 3222
54d01ffb 3223 /* Need a session for kernel command */
44d3bd01 3224 if (need_tracing_session) {
54d01ffb
DG		 3225 if (cmd_ctx->session->kernel_session == NULL) {
3226 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3227 if (ret < 0) {
54d01ffb 3228 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3229 goto error;
3230 }
b389abbe 3231 }
7d29a247 3232
54d01ffb 3233 /* Start the kernel consumer daemon */
3bd1e081
MD		 3234 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3235 if (kconsumer_data.pid == 0 &&
54d01ffb 3236 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3237 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3238 ret = start_consumerd(&kconsumer_data);
7d29a247 3239 if (ret < 0) {
54d01ffb
DG		 3240 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3241 goto error;
950131af 3242 }
3ff2ecac
MD		 3243 } else {
3244 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3245 }
0d0c377a 3246 }
54d01ffb 3247 break;
2bdd86d4 3248 case LTTNG_DOMAIN_UST:
44d3bd01 3249 {
44d3bd01 3250 if (need_tracing_session) {
f6a9efaa 3251 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG		 3252 ret = create_ust_session(cmd_ctx->session,
3253 &cmd_ctx->lsm->domain);
3254 if (ret != LTTCOMM_OK) {
3255 goto error;
3256 }
3257 }
7753dea8
MD		 3258 /* Start the UST consumer daemons */
3259 /* 64-bit */
3260 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3261 if (consumerd64_bin[0] != '\0' &&
7753dea8 3262 ustconsumer64_data.pid == 0 &&
2bdd86d4 3263 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3264 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3265 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3266 if (ret < 0) {
7753dea8
MD		 3267 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3268 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3269 goto error;
3270 }
48842b30 3271
7753dea8 3272 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3273 } else {
7753dea8
MD		 3274 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3275 }
3276 /* 32-bit */
fc7a59ce 3277 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3278 ustconsumer32_data.pid == 0 &&
3279 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3280 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3281 ret = start_consumerd(&ustconsumer32_data);
3282 if (ret < 0) {
3283 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3284 ust_consumerd32_fd = -EINVAL;
3285 goto error;
3286 }
3287 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3288 } else {
3289 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3290 }
44d3bd01
DG		 3291 }
3292 break;
48842b30 3293 }
54d01ffb 3294 default:
54d01ffb
DG		 3295 break;
3296 }
33a2b854 3297
54d01ffb
DG		 3298 /* Process by command type */
3299 switch (cmd_ctx->lsm->cmd_type) {
3300 case LTTNG_ADD_CONTEXT:
3301 {
3302 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3303 cmd_ctx->lsm->u.context.channel_name,
3304 cmd_ctx->lsm->u.context.event_name,
3305 &cmd_ctx->lsm->u.context.ctx);
3306 break;
3307 }
3308 case LTTNG_DISABLE_CHANNEL:
3309 {
3310 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3311 cmd_ctx->lsm->u.disable.channel_name);
3312 break;
3313 }
3314 case LTTNG_DISABLE_EVENT:
3315 {
3316 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3317 cmd_ctx->lsm->u.disable.channel_name,
3318 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3319 ret = LTTCOMM_OK;
3320 break;
3321 }
54d01ffb
DG		 3322 case LTTNG_DISABLE_ALL_EVENT:
3323 {
2bdd86d4 3324 DBG("Disabling all events");
54d01ffb
DG		 3325
3326 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3327 cmd_ctx->lsm->u.disable.channel_name);
3328 break;
3329 }
3330 case LTTNG_ENABLE_CHANNEL:
3331 {
aea829b3 3332 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3333 &cmd_ctx->lsm->u.channel.chan);
3334 break;
3335 }
3336 case LTTNG_ENABLE_EVENT:
3337 {
3338 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3339 cmd_ctx->lsm->u.enable.channel_name,
3340 &cmd_ctx->lsm->u.enable.event);
3341 break;
3342 }
3343 case LTTNG_ENABLE_ALL_EVENT:
3344 {
2bdd86d4 3345 DBG("Enabling all events");
54d01ffb
DG		 3346
3347 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3348 cmd_ctx->lsm->u.enable.channel_name,
3349 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3350 break;
3351 }
052da939 3352 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3353 {
9f19cc17 3354 struct lttng_event *events;
54d01ffb 3355 ssize_t nb_events;
052da939 3356
54d01ffb
DG		 3357 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3358 if (nb_events < 0) {
3359 ret = -nb_events;
3360 goto error;
2ef84c95
DG		 3361 }
3362
3363 /*
3364 * Setup lttng message with payload size set to the event list size in
3365 * bytes and then copy list into the llm payload.
3366 */
052da939 3367 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3368 if (ret < 0) {
052da939 3369 free(events);
2ef84c95
DG		 3370 goto setup_error;
3371 }
3372
3373 /* Copy event list into message payload */
9f19cc17 3374 memcpy(cmd_ctx->llm->payload, events,
052da939 3375 sizeof(struct lttng_event) * nb_events);
2ef84c95 3376
9f19cc17 3377 free(events);
2ef84c95
DG		 3378
3379 ret = LTTCOMM_OK;
3380 break;
3381 }
f3ed775e 3382 case LTTNG_START_TRACE:
8c0faa1d 3383 {
54d01ffb 3384 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3385 break;
3386 }
f3ed775e 3387 case LTTNG_STOP_TRACE:
8c0faa1d 3388 {
54d01ffb 3389 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3390 break;
3391 }
5e16da05
MD		 3392 case LTTNG_CREATE_SESSION:
3393 {
54d01ffb
DG		 3394 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3395 cmd_ctx->lsm->session.path);
5e16da05
MD		 3396 break;
3397 }
3398 case LTTNG_DESTROY_SESSION:
3399 {
54d01ffb
DG		 3400 ret = cmd_destroy_session(cmd_ctx->session,
3401 cmd_ctx->lsm->session.name);
5461b305 3402 break;
5e16da05 3403 }
9f19cc17 3404 case LTTNG_LIST_DOMAINS:
5e16da05 3405 {
54d01ffb
DG		 3406 ssize_t nb_dom;
3407 struct lttng_domain *domains;
5461b305 3408
54d01ffb
DG		 3409 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3410 if (nb_dom < 0) {
3411 ret = -nb_dom;
3412 goto error;
ce3d728c 3413 }
520ff687 3414
54d01ffb 3415 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3416 if (ret < 0) {
3417 goto setup_error;
520ff687 3418 }
57167058 3419
54d01ffb
DG		 3420 /* Copy event list into message payload */
3421 memcpy(cmd_ctx->llm->payload, domains,
3422 nb_dom * sizeof(struct lttng_domain));
3423
3424 free(domains);
5e16da05 3425
5461b305 3426 ret = LTTCOMM_OK;
5e16da05
MD		 3427 break;
3428 }
9f19cc17 3429 case LTTNG_LIST_CHANNELS:
5e16da05 3430 {
54d01ffb
DG		 3431 size_t nb_chan;
3432 struct lttng_channel *channels;
3433
b551a063
DG		 3434 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3435 cmd_ctx->session, &channels);
54d01ffb
DG		 3436 if (nb_chan < 0) {
3437 ret = -nb_chan;
3438 goto error;
5461b305 3439 }
ca95a216 3440
54d01ffb 3441 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3442 if (ret < 0) {
3443 goto setup_error;
3444 }
9f19cc17 3445
54d01ffb
DG		 3446 /* Copy event list into message payload */
3447 memcpy(cmd_ctx->llm->payload, channels,
3448 nb_chan * sizeof(struct lttng_channel));
3449
3450 free(channels);
9f19cc17
DG		 3451
3452 ret = LTTCOMM_OK;
5461b305 3453 break;
5e16da05 3454 }
9f19cc17 3455 case LTTNG_LIST_EVENTS:
5e16da05 3456 {
b551a063 3457 ssize_t nb_event;
684d34d2 3458 struct lttng_event *events = NULL;
9f19cc17 3459
b551a063 3460 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3461 cmd_ctx->lsm->u.list.channel_name, &events);
3462 if (nb_event < 0) {
3463 ret = -nb_event;
3464 goto error;
5461b305 3465 }
ca95a216 3466
54d01ffb 3467 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3468 if (ret < 0) {
3469 goto setup_error;
3470 }
9f19cc17 3471
54d01ffb
DG		 3472 /* Copy event list into message payload */
3473 memcpy(cmd_ctx->llm->payload, events,
3474 nb_event * sizeof(struct lttng_event));
9f19cc17 3475
54d01ffb 3476 free(events);
9f19cc17
DG		 3477
3478 ret = LTTCOMM_OK;
5461b305 3479 break;
5e16da05
MD		 3480 }
3481 case LTTNG_LIST_SESSIONS:
3482 {
54d01ffb 3483 session_lock_list();
5461b305 3484
6c9cc2ab 3485 if (session_list_ptr->count == 0) {
f3ed775e 3486 ret = LTTCOMM_NO_SESSION;
54d01ffb 3487 session_unlock_list();
5461b305 3488 goto error;
57167058 3489 }
5e16da05 3490
6c9cc2ab
DG		 3491 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3492 session_list_ptr->count);
5461b305 3493 if (ret < 0) {
54d01ffb 3494 session_unlock_list();
5461b305 3495 goto setup_error;
e065084a 3496 }
5e16da05 3497
6c9cc2ab
DG		 3498 /* Filled the session array */
3499 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3500
54d01ffb 3501 session_unlock_list();
5e16da05 3502
5461b305 3503 ret = LTTCOMM_OK;
5e16da05
MD		 3504 break;
3505 }
d0254c7c
MD		 3506 case LTTNG_CALIBRATE:
3507 {
54d01ffb
DG		 3508 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3509 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3510 break;
3511 }
d9800920
DG		 3512 case LTTNG_REGISTER_CONSUMER:
3513 {
54d01ffb
DG		 3514 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3515 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3516 break;
3517 }
5e16da05 3518 default:
5e16da05 3519 ret = LTTCOMM_UND;
5461b305 3520 break;
fac6795d
DG		 3521 }
3522
5461b305 3523error:
5461b305
DG		 3524 if (cmd_ctx->llm == NULL) {
3525 DBG("Missing llm structure. Allocating one.");
894be886 3526 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3527 goto setup_error;
3528 }
3529 }
54d01ffb 3530 /* Set return code */
5461b305 3531 cmd_ctx->llm->ret_code = ret;
5461b305 3532setup_error:
b5541356 3533 if (cmd_ctx->session) {
54d01ffb 3534 session_unlock(cmd_ctx->session);
b5541356 3535 }
54d01ffb 3536init_setup_error:
8028d920 3537 return ret;
fac6795d
DG		 3538}
3539
1d4b027a 3540/*
d063d709
DG		 3541 * This thread manage all clients request using the unix client socket for
3542 * communication.
1d4b027a
DG		 3543 */
3544static void *thread_manage_clients(void *data)
3545{
5eb91c98
DG		 3546 int sock = 0, ret, i, pollfd;
3547 uint32_t revents, nb_fd;
273ea72c 3548 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3549 struct lttng_poll_event events;
1d4b027a
DG		 3550
3551 DBG("[thread] Manage client started");
3552
f6a9efaa
DG		 3553 rcu_register_thread();
3554
1d4b027a
DG		 3555 ret = lttcomm_listen_unix_sock(client_sock);
3556 if (ret < 0) {
3557 goto error;
3558 }
3559
5eb91c98
DG		 3560 /*
3561 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3562 * more will be added to this poll set.
3563 */
3564 ret = create_thread_poll_set(&events, 2);
3565 if (ret < 0) {
3566 goto error;
3567 }
273ea72c 3568
5eb91c98
DG		 3569 /* Add the application registration socket */
3570 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3571 if (ret < 0) {
3572 goto error;
3573 }
273ea72c 3574
bbd973c2
DG		 3575 /*
3576 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3577 */
3578 if (opt_sig_parent) {
3579 kill(ppid, SIGCHLD);
3580 }
3581
3582 while (1) {
1d4b027a 3583 DBG("Accepting client command ...");
273ea72c 3584
5eb91c98
DG		 3585 nb_fd = LTTNG_POLL_GETNB(&events);
3586
273ea72c 3587 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3588 ret = lttng_poll_wait(&events, -1);
273ea72c 3589 if (ret < 0) {
273ea72c
DG		 3590 goto error;
3591 }
3592
5eb91c98
DG		 3593 for (i = 0; i < nb_fd; i++) {
3594 /* Fetch once the poll data */
3595 revents = LTTNG_POLL_GETEV(&events, i);
3596 pollfd = LTTNG_POLL_GETFD(&events, i);
3597
3598 /* Thread quit pipe has been closed. Killing thread. */
3599 ret = check_thread_quit_pipe(pollfd, revents);
3600 if (ret) {
3601 goto error;
3602 }
3603
3604 /* Event on the registration socket */
3605 if (pollfd == client_sock) {
3606 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3607 ERR("Client socket poll error");
3608 goto error;
3609 }
3610 }
3611 }
3612
3613 DBG("Wait for client response");
3614
3615 sock = lttcomm_accept_unix_sock(client_sock);
3616 if (sock < 0) {
273ea72c 3617 goto error;
273ea72c
DG		 3618 }
3619
5eb91c98 3620 /* Allocate context command to process the client request */
ba7f0ae5 3621 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3622 if (cmd_ctx == NULL) {
ba7f0ae5 3623 perror("zmalloc cmd_ctx");
1d4b027a 3624 goto error;
5eb91c98 3625 }
1d4b027a 3626
5eb91c98 3627 /* Allocate data buffer for reception */
ba7f0ae5 3628 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3629 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3630 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3631 goto error;
3632 }
1d4b027a 3633
5eb91c98
DG		 3634 cmd_ctx->llm = NULL;
3635 cmd_ctx->session = NULL;
1d4b027a 3636
5eb91c98
DG		 3637 /*
3638 * Data is received from the lttng client. The struct
3639 * lttcomm_session_msg (lsm) contains the command and data request of
3640 * the client.
3641 */
3642 DBG("Receiving data from client ...");
3643 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3644 sizeof(struct lttcomm_session_msg));
3645 if (ret <= 0) {
3646 DBG("Nothing recv() from client... continuing");
3647 close(sock);
3648 free(cmd_ctx);
3649 continue;
3650 }
1d4b027a 3651
5eb91c98
DG		 3652 // TODO: Validate cmd_ctx including sanity check for
3653 // security purpose.
f7776ea7 3654
f6a9efaa 3655 rcu_thread_online();
5eb91c98
DG		 3656 /*
3657 * This function dispatch the work to the kernel or userspace tracer
3658 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3659 * informations for the client. The command context struct contains
3660 * everything this function may needs.
3661 */
3662 ret = process_client_msg(cmd_ctx);
f6a9efaa 3663 rcu_thread_offline();
5eb91c98 3664 if (ret < 0) {
bbd973c2 3665 /*
5eb91c98 3666 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3667 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3668 * (ENOMEM). Error detected but still accept command.
bbd973c2 3669 */
bbd973c2 3670 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3671 continue;
3672 }
d6e4fca4 3673
54d01ffb
DG		 3674 DBG("Sending response (size: %d, retcode: %s)",
3675 cmd_ctx->lttng_msg_size,
9a745bc7 3676 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3677 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3678 if (ret < 0) {
3679 ERR("Failed to send data back to client");
bbd973c2 3680 }
1d4b027a 3681
5eb91c98
DG		 3682 clean_command_ctx(&cmd_ctx);
3683
3684 /* End of transmission */
273ea72c
DG		 3685 close(sock);
3686 }
3687
5eb91c98
DG		 3688error:
3689 DBG("Client thread dying");
273ea72c 3690 unlink(client_unix_sock_path);
5eb91c98
DG		 3691 close(client_sock);
3692 close(sock);
273ea72c 3693
5eb91c98 3694 lttng_poll_clean(&events);
a2fb29a5 3695 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3696
3697 rcu_unregister_thread();
1d4b027a
DG		 3698 return NULL;
3699}
3700
3701
fac6795d
DG		 3702/*
3703 * usage function on stderr
3704 */
3705static void usage(void)
3706{
b716ce68 3707 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3708 fprintf(stderr, " -h, --help Display this usage.\n");
3709 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3710 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3711 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3712 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3713 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3714 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3715 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3716 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3717 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3718 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3719 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3720 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3721 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3722 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3723 fprintf(stderr, " -V, --version Show version number.\n");
3724 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3725 fprintf(stderr, " -q, --quiet No output at all.\n");
3726 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3727 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
fac6795d
DG		 3728}
3729
3730/*
3731 * daemon argument parsing
3732 */
3733static int parse_args(int argc, char **argv)
3734{
3735 int c;
3736
3737 static struct option long_options[] = {
3738 { "client-sock", 1, 0, 'c' },
3739 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3740 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3741 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3742 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3743 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3744 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3745 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3746 { "consumerd32-path", 1, 0, 'u' },
3747 { "consumerd32-libdir", 1, 0, 'U' },
3748 { "consumerd64-path", 1, 0, 't' },
3749 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3750 { "daemonize", 0, 0, 'd' },
5b8719f5 3751 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3752 { "help", 0, 0, 'h' },
3753 { "group", 1, 0, 'g' },
3754 { "version", 0, 0, 'V' },
75462a81 3755 { "quiet", 0, 0, 'q' },
3f9947db 3756 { "verbose", 0, 0, 'v' },
3bd1e081 3757 { "verbose-consumer", 0, 0, 'Z' },
fac6795d
DG		 3758 { NULL, 0, 0, 0 }
3759 };
3760
3761 while (1) {
3762 int option_index = 0;
7753dea8 3763 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3764 long_options, &option_index);
fac6795d
DG		 3765 if (c == -1) {
3766 break;
3767 }
3768
3769 switch (c) {
3770 case 0:
3771 fprintf(stderr, "option %s", long_options[option_index].name);
3772 if (optarg) {
3773 fprintf(stderr, " with arg %s\n", optarg);
3774 }
3775 break;
b716ce68 3776 case 'c':
fac6795d
DG		 3777 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3778 break;
3779 case 'a':
3780 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3781 break;
3782 case 'd':
3783 opt_daemon = 1;
3784 break;
3785 case 'g':
fb09408a 3786 opt_tracing_group = optarg;
fac6795d
DG		 3787 break;
3788 case 'h':
3789 usage();
3790 exit(EXIT_FAILURE);
3791 case 'V':
3792 fprintf(stdout, "%s\n", VERSION);
3793 exit(EXIT_SUCCESS);
5b8719f5
DG		 3794 case 'S':
3795 opt_sig_parent = 1;
3796 break;
d6f42150 3797 case 'E':
3bd1e081 3798 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3799 break;
3800 case 'C':
3bd1e081
MD		 3801 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3802 break;
3803 case 'F':
7753dea8 3804 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3805 break;
3806 case 'D':
7753dea8
MD		 3807 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3808 break;
3809 case 'H':
3810 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3811 break;
3812 case 'G':
3813 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3814 break;
75462a81
DG		 3815 case 'q':
3816 opt_quiet = 1;
3817 break;
3f9947db 3818 case 'v':
53086306
DG		 3819 /* Verbose level can increase using multiple -v */
3820 opt_verbose += 1;
3f9947db 3821 break;
31f73cc9 3822 case 'Z':
3bd1e081 3823 opt_verbose_consumer += 1;
31f73cc9 3824 break;
fb09408a 3825 case 'u':
fc7a59ce 3826 consumerd32_bin= optarg;
ebaeda94
MD		 3827 break;
3828 case 'U':
3829 consumerd32_libdir = optarg;
7753dea8
MD		 3830 break;
3831 case 't':
fc7a59ce 3832 consumerd64_bin = optarg;
ebaeda94
MD		 3833 break;
3834 case 'T':
3835 consumerd64_libdir = optarg;
fb09408a 3836 break;
fac6795d
DG		 3837 default:
3838 /* Unknown option or other error.
3839 * Error is printed by getopt, just return */
3840 return -1;
3841 }
3842 }
3843
3844 return 0;
3845}
3846
3847/*
d063d709 3848 * Creates the two needed socket by the daemon.
d6f42150
DG		 3849 * apps_sock - The communication socket for all UST apps.
3850 * client_sock - The communication of the cli tool (lttng).
fac6795d 3851 */
cf3af59e 3852static int init_daemon_socket(void)
fac6795d
DG		 3853{
3854 int ret = 0;
3855 mode_t old_umask;
3856
3857 old_umask = umask(0);
3858
3859 /* Create client tool unix socket */
d6f42150
DG		 3860 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3861 if (client_sock < 0) {
3862 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3863 ret = -1;
3864 goto end;
3865 }
3866
3867 /* File permission MUST be 660 */
3868 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3869 if (ret < 0) {
d6f42150 3870 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3871 perror("chmod");
3872 goto end;
3873 }
3874
3875 /* Create the application unix socket */
d6f42150
DG		 3876 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3877 if (apps_sock < 0) {
3878 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3879 ret = -1;
3880 goto end;
3881 }
3882
d6f42150 3883 /* File permission MUST be 666 */
54d01ffb
DG		 3884 ret = chmod(apps_unix_sock_path,
3885 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3886 if (ret < 0) {
d6f42150 3887 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3888 perror("chmod");
3889 goto end;
3890 }
3891
3892end:
3893 umask(old_umask);
3894 return ret;
3895}
3896
3897/*
54d01ffb
DG		 3898 * Check if the global socket is available, and if a daemon is answering at the
3899 * other side. If yes, error is returned.
fac6795d 3900 */
cf3af59e 3901static int check_existing_daemon(void)
fac6795d 3902{
7d8234d9 3903 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3904 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3905 return 0;
099e26bd 3906 }
54d01ffb 3907
7d8234d9 3908 /* Is there anybody out there ? */
099e26bd 3909 if (lttng_session_daemon_alive()) {
7d8234d9 3910 return -EEXIST;
099e26bd 3911 } else {
7d8234d9 3912 return 0;
099e26bd 3913 }
fac6795d
DG		 3914}
3915
fac6795d 3916/*
d063d709 3917 * Set the tracing group gid onto the client socket.
5e16da05 3918 *
d063d709
DG		 3919 * Race window between mkdir and chown is OK because we are going from more
3920 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3921 */
d6f42150 3922static int set_permissions(void)
fac6795d
DG		 3923{
3924 int ret;
996b65c8 3925 gid_t gid;
fac6795d 3926
996b65c8
MD		 3927 gid = allowed_group();
3928 if (gid < 0) {
a463f419
DG		 3929 if (is_root) {
3930 WARN("No tracing group detected");
3931 ret = 0;
3932 } else {
3933 ERR("Missing tracing group. Aborting execution.");
3934 ret = -1;
3935 }
fac6795d
DG		 3936 goto end;
3937 }
3938
d6f42150 3939 /* Set lttng run dir */
996b65c8 3940 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG		 3941 if (ret < 0) {
3942 ERR("Unable to set group on " LTTNG_RUNDIR);
3943 perror("chown");
3944 }
3945
3946 /* lttng client socket path */
996b65c8 3947 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3948 if (ret < 0) {
d6f42150
DG		 3949 ERR("Unable to set group on %s", client_unix_sock_path);
3950 perror("chown");
3951 }
3952
3bd1e081
MD		 3953 /* kconsumer error socket path */
3954 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 3955 if (ret < 0) {
3bd1e081
MD		 3956 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3957 perror("chown");
3958 }
3959
7753dea8
MD		 3960 /* 64-bit ustconsumer error socket path */
3961 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3962 if (ret < 0) {
3963 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3964 perror("chown");
3965 }
3966
3967 /* 32-bit ustconsumer compat32 error socket path */
3968 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 3969 if (ret < 0) {
7753dea8 3970 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 3971 perror("chown");
3972 }
3973
d6f42150 3974 DBG("All permissions are set");
e07ae692 3975
fac6795d
DG		 3976end:
3977 return ret;
3978}
3979
7a485870 3980/*
d063d709 3981 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 3982 */
3983static int create_kernel_poll_pipe(void)
3984{
3985 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3986}
3987
099e26bd
DG		 3988/*
3989 * Create the application command pipe to wake thread_manage_apps.
3990 */
3991static int create_apps_cmd_pipe(void)
3992{
3993 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3994}
3995
d6f42150 3996/*
d063d709 3997 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG		 3998 */
3999static int create_lttng_rundir(void)
4000{
4001 int ret;
4002
4003 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
4004 if (ret < 0) {
b1f11e69
DG		 4005 if (errno != EEXIST) {
4006 ERR("Unable to create " LTTNG_RUNDIR);
4007 goto error;
4008 } else {
4009 ret = 0;
4010 }
d6f42150
DG		 4011 }
4012
4013error:
4014 return ret;
4015}
4016
4017/*
d063d709
DG		 4018 * Setup sockets and directory needed by the kconsumerd communication with the
4019 * session daemon.
d6f42150 4020 */
3bd1e081 4021static int set_consumer_sockets(struct consumer_data *consumer_data)
d6f42150
DG		 4022{
4023 int ret;
7753dea8 4024 const char *path;
d6f42150 4025
7753dea8
MD		 4026 switch (consumer_data->type) {
4027 case LTTNG_CONSUMER_KERNEL:
4028 path = KCONSUMERD_PATH;
4029 break;
4030 case LTTNG_CONSUMER64_UST:
4031 path = USTCONSUMERD64_PATH;
4032 break;
4033 case LTTNG_CONSUMER32_UST:
4034 path = USTCONSUMERD32_PATH;
4035 break;
4036 default:
4037 ERR("Consumer type unknown");
4038 ret = -EINVAL;
4039 goto error;
d6f42150
DG		 4040 }
4041
3bd1e081 4042 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4043 if (ret < 0) {
6beb2242 4044 if (errno != EEXIST) {
3bd1e081 4045 ERR("Failed to create %s", path);
6beb2242
DG		 4046 goto error;
4047 }
4048 ret = 0;
d6f42150
DG		 4049 }
4050
4051 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4052 consumer_data->err_sock =
4053 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4054 if (consumer_data->err_sock < 0) {
4055 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4056 ret = -1;
4057 goto error;
4058 }
4059
4060 /* File permission MUST be 660 */
3bd1e081 4061 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4062 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4063 if (ret < 0) {
3bd1e081 4064 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4065 perror("chmod");
4066 goto error;
4067 }
4068
4069error:
4070 return ret;
4071}
4072
fac6795d 4073/*
d063d709 4074 * Signal handler for the daemon
cf3af59e 4075 *
54d01ffb
DG		 4076 * Simply stop all worker threads, leaving main() return gracefully after
4077 * joining all threads and calling cleanup().
fac6795d
DG		 4078 */
4079static void sighandler(int sig)
4080{
4081 switch (sig) {
cf3af59e
MD		 4082 case SIGPIPE:
4083 DBG("SIGPIPE catched");
4084 return;
4085 case SIGINT:
4086 DBG("SIGINT catched");
4087 stop_threads();
4088 break;
4089 case SIGTERM:
4090 DBG("SIGTERM catched");
4091 stop_threads();
4092 break;
4093 default:
4094 break;
fac6795d 4095 }
fac6795d
DG		 4096}
4097
4098/*
d063d709 4099 * Setup signal handler for :
1d4b027a 4100 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4101 */
1d4b027a 4102static int set_signal_handler(void)
fac6795d 4103{
1d4b027a
DG		 4104 int ret = 0;
4105 struct sigaction sa;
4106 sigset_t sigset;
fac6795d 4107
1d4b027a
DG		 4108 if ((ret = sigemptyset(&sigset)) < 0) {
4109 perror("sigemptyset");
4110 return ret;
4111 }
d6f42150 4112
1d4b027a
DG		 4113 sa.sa_handler = sighandler;
4114 sa.sa_mask = sigset;
4115 sa.sa_flags = 0;
4116 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4117 perror("sigaction");
4118 return ret;
d6f42150
DG		 4119 }
4120
1d4b027a
DG		 4121 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4122 perror("sigaction");
4123 return ret;
d6f42150 4124 }
aaf26714 4125
1d4b027a
DG		 4126 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4127 perror("sigaction");
4128 return ret;
8c0faa1d
DG		 4129 }
4130
1d4b027a
DG		 4131 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4132
4133 return ret;
fac6795d
DG		 4134}
4135
f3ed775e 4136/*
d063d709
DG		 4137 * Set open files limit to unlimited. This daemon can open a large number of
4138 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4139 */
4140static void set_ulimit(void)
4141{
4142 int ret;
4143 struct rlimit lim;
4144
a88df331 4145 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4146 lim.rlim_cur = 65535;
4147 lim.rlim_max = 65535;
4148
4149 ret = setrlimit(RLIMIT_NOFILE, &lim);
4150 if (ret < 0) {
4151 perror("failed to set open files limit");
4152 }
4153}
4154
fac6795d
DG		 4155/*
4156 * main
4157 */
4158int main(int argc, char **argv)
4159{
fac6795d
DG		 4160 int ret = 0;
4161 void *status;
b082db07 4162 const char *home_path;
fac6795d 4163
f6a9efaa
DG		 4164 rcu_register_thread();
4165
273ea72c 4166 /* Create thread quit pipe */
cf3af59e
MD		 4167 if ((ret = init_thread_quit_pipe()) < 0) {
4168 goto error;
273ea72c
DG		 4169 }
4170
7753dea8 4171 setup_consumerd_path();
fb09408a 4172
fac6795d
DG		 4173 /* Parse arguments */
4174 progname = argv[0];
4175 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4176 goto error;
fac6795d
DG		 4177 }
4178
4179 /* Daemonize */
4180 if (opt_daemon) {
53094c05
DG		 4181 ret = daemon(0, 0);
4182 if (ret < 0) {
4183 perror("daemon");
cf3af59e 4184 goto error;
53094c05 4185 }
fac6795d
DG		 4186 }
4187
4188 /* Check if daemon is UID = 0 */
4189 is_root = !getuid();
4190
fac6795d 4191 if (is_root) {
d6f42150
DG		 4192 ret = create_lttng_rundir();
4193 if (ret < 0) {
cf3af59e 4194 goto error;
d6f42150
DG		 4195 }
4196
fac6795d 4197 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4198 snprintf(apps_unix_sock_path, PATH_MAX,
4199 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4200 }
4201
4202 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4203 snprintf(client_unix_sock_path, PATH_MAX,
4204 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4205 }
0fdd1e2c
DG		 4206
4207 /* Set global SHM for ust */
4208 if (strlen(wait_shm_path) == 0) {
4209 snprintf(wait_shm_path, PATH_MAX,
4210 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4211 }
fac6795d 4212 } else {
b082db07
DG		 4213 home_path = get_home_dir();
4214 if (home_path == NULL) {
273ea72c
DG		 4215 /* TODO: Add --socket PATH option */
4216 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4217 ret = -EPERM;
4218 goto error;
b082db07
DG		 4219 }
4220
fac6795d 4221 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4222 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4223 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4224 }
4225
4226 /* Set the cli tool unix socket path */
4227 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4228 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4229 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4230 }
0fdd1e2c
DG		 4231
4232 /* Set global SHM for ust */
4233 if (strlen(wait_shm_path) == 0) {
4234 snprintf(wait_shm_path, PATH_MAX,
4235 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4236 }
fac6795d
DG		 4237 }
4238
847177cd
DG		 4239 DBG("Client socket path %s", client_unix_sock_path);
4240 DBG("Application socket path %s", apps_unix_sock_path);
4241
273ea72c 4242 /*
7d8234d9 4243 * See if daemon already exist.
fac6795d 4244 */
7d8234d9 4245 if ((ret = check_existing_daemon()) < 0) {
75462a81 4246 ERR("Already running daemon.\n");
273ea72c 4247 /*
cf3af59e
MD		 4248 * We do not goto exit because we must not cleanup()
4249 * because a daemon is already running.
ab118b20 4250 */
cf3af59e 4251 goto error;
a88df331
DG		 4252 }
4253
54d01ffb 4254 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4255
4256 /*
4257 * These actions must be executed as root. We do that *after* setting up
4258 * the sockets path because we MUST make the check for another daemon using
4259 * those paths *before* trying to set the kernel consumer sockets and init
4260 * kernel tracer.
4261 */
4262 if (is_root) {
3bd1e081
MD		 4263 ret = set_consumer_sockets(&kconsumer_data);
4264 if (ret < 0) {
4265 goto exit;
4266 }
48842b30 4267
7753dea8 4268 ret = set_consumer_sockets(&ustconsumer64_data);
a88df331 4269 if (ret < 0) {
cf3af59e 4270 goto exit;
a88df331 4271 }
7753dea8
MD		 4272
4273 ret = set_consumer_sockets(&ustconsumer32_data);
4274 if (ret < 0) {
4275 goto exit;
4276 }
4277
a88df331
DG		 4278 /* Setup kernel tracer */
4279 init_kernel_tracer();
4280
4281 /* Set ulimit for open files */
4282 set_ulimit();
fac6795d
DG		 4283 }
4284
cf3af59e
MD		 4285 if ((ret = set_signal_handler()) < 0) {
4286 goto exit;
fac6795d
DG		 4287 }
4288
d6f42150 4289 /* Setup the needed unix socket */
cf3af59e
MD		 4290 if ((ret = init_daemon_socket()) < 0) {
4291 goto exit;
fac6795d
DG		 4292 }
4293
4294 /* Set credentials to socket */
cf3af59e
MD		 4295 if (is_root && ((ret = set_permissions()) < 0)) {
4296 goto exit;
fac6795d
DG		 4297 }
4298
5b8719f5
DG		 4299 /* Get parent pid if -S, --sig-parent is specified. */
4300 if (opt_sig_parent) {
4301 ppid = getppid();
4302 }
4303
7a485870 4304 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4305 if ((ret = create_kernel_poll_pipe()) < 0) {
4306 goto exit;
7a485870
DG		 4307 }
4308
099e26bd
DG		 4309 /* Setup the thread apps communication pipe. */
4310 if ((ret = create_apps_cmd_pipe()) < 0) {
4311 goto exit;
4312 }
4313
4314 /* Init UST command queue. */
4315 cds_wfq_init(&ust_cmd_queue.queue);
4316
f6a9efaa
DG		 4317 /* Init UST app hash table */
4318 ust_app_ht_alloc();
4319
273ea72c 4320 /*
54d01ffb
DG		 4321 * Get session list pointer. This pointer MUST NOT be free(). This list is
4322 * statically declared in session.c
273ea72c 4323 */
54d01ffb 4324 session_list_ptr = session_get_list();
b5541356 4325
5eb91c98
DG		 4326 /* Set up max poll set size */
4327 lttng_poll_set_max_size();
4328
cf3af59e 4329 /* Create thread to manage the client socket */
099e26bd
DG		 4330 ret = pthread_create(&client_thread, NULL,
4331 thread_manage_clients, (void *) NULL);
cf3af59e 4332 if (ret != 0) {
099e26bd 4333 perror("pthread_create clients");
cf3af59e
MD		 4334 goto exit_client;
4335 }
fac6795d 4336
099e26bd
DG		 4337 /* Create thread to dispatch registration */
4338 ret = pthread_create(&dispatch_thread, NULL,
4339 thread_dispatch_ust_registration, (void *) NULL);
4340 if (ret != 0) {
4341 perror("pthread_create dispatch");
4342 goto exit_dispatch;
4343 }
4344
4345 /* Create thread to manage application registration. */
4346 ret = pthread_create(&reg_apps_thread, NULL,
4347 thread_registration_apps, (void *) NULL);
4348 if (ret != 0) {
4349 perror("pthread_create registration");
4350 goto exit_reg_apps;
4351 }
4352
cf3af59e 4353 /* Create thread to manage application socket */
54d01ffb
DG		 4354 ret = pthread_create(&apps_thread, NULL,
4355 thread_manage_apps, (void *) NULL);
cf3af59e 4356 if (ret != 0) {
099e26bd 4357 perror("pthread_create apps");
cf3af59e
MD		 4358 goto exit_apps;
4359 }
fac6795d 4360
cf3af59e 4361 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4362 ret = pthread_create(&kernel_thread, NULL,
4363 thread_manage_kernel, (void *) NULL);
cf3af59e 4364 if (ret != 0) {
099e26bd 4365 perror("pthread_create kernel");
cf3af59e
MD		 4366 goto exit_kernel;
4367 }
7a485870 4368
cf3af59e
MD		 4369 ret = pthread_join(kernel_thread, &status);
4370 if (ret != 0) {
4371 perror("pthread_join");
4372 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4373 }
4374
cf3af59e
MD		 4375exit_kernel:
4376 ret = pthread_join(apps_thread, &status);
4377 if (ret != 0) {
4378 perror("pthread_join");
4379 goto error; /* join error, exit without cleanup */
4380 }
fac6795d 4381
cf3af59e 4382exit_apps:
099e26bd
DG		 4383 ret = pthread_join(reg_apps_thread, &status);
4384 if (ret != 0) {
4385 perror("pthread_join");
4386 goto error; /* join error, exit without cleanup */
4387 }
4388
4389exit_reg_apps:
4390 ret = pthread_join(dispatch_thread, &status);
4391 if (ret != 0) {
4392 perror("pthread_join");
4393 goto error; /* join error, exit without cleanup */
4394 }
4395
4396exit_dispatch:
cf3af59e
MD		 4397 ret = pthread_join(client_thread, &status);
4398 if (ret != 0) {
4399 perror("pthread_join");
4400 goto error; /* join error, exit without cleanup */
4401 }
4402
3bd1e081 4403 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4404 if (ret != 0) {
3bd1e081 4405 perror("join_consumer");
cf3af59e
MD		 4406 goto error; /* join error, exit without cleanup */
4407 }
a88df331 4408
cf3af59e 4409exit_client:
a88df331 4410exit:
cf3af59e
MD		 4411 /*
4412 * cleanup() is called when no other thread is running.
4413 */
f6a9efaa 4414 rcu_thread_online();
cf3af59e 4415 cleanup();
f6a9efaa
DG		 4416 rcu_thread_offline();
4417 rcu_unregister_thread();
cf3af59e
MD		 4418 if (!ret)
4419 exit(EXIT_SUCCESS);
4420error:
5e16da05 4421 exit(EXIT_FAILURE);
fac6795d 4422}
LTTng 2.0 tools and control repository
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