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[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
AM		 1529 /*
1530 * Find out which consumerd to execute. We will first
1531 * try the 64-bit path, then the 32-bit one, then
1532 * fallback on sessiond's installation directory.
1533 */
1534 if (stat(consumerd64_bin, &st) == 0) {
1535 consumer_to_use = consumerd64_bin;
1536 } else if (stat(consumerd32_bin, &st) == 0) {
1537 consumer_to_use = consumerd32_bin;
1538 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1539 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1540 } else {
1541 break;
1542 }
1543 DBG("Using kernel consumer at: %s", consumer_to_use);
1544 execl(consumer_to_use,
1545 "lttng-consumerd", verbosity, "-k",
1546 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1547 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1548 NULL);
3bd1e081 1549 break;
7753dea8
MD		 1550 case LTTNG_CONSUMER64_UST:
1551 {
b1e0b6b6 1552 char *tmpnew = NULL;
8f4905da
MD		 1553
1554 if (consumerd64_libdir[0] != '\0') {
1555 char *tmp;
1556 size_t tmplen;
1557
1558 tmp = getenv("LD_LIBRARY_PATH");
1559 if (!tmp) {
1560 tmp = "";
1561 }
1562 tmplen = strlen("LD_LIBRARY_PATH=")
1563 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1564 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1565 if (!tmpnew) {
1566 ret = -ENOMEM;
1567 goto error;
1568 }
1569 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1570 strcat(tmpnew, consumerd64_libdir);
1571 if (tmp[0] != '\0') {
1572 strcat(tmpnew, ":");
1573 strcat(tmpnew, tmp);
1574 }
1575 ret = putenv(tmpnew);
1576 if (ret) {
1577 ret = -errno;
1578 goto error;
1579 }
1580 }
94c55f17 1581 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
fc7a59ce 1582 ret = execl(consumerd64_bin, verbosity, "-u",
7753dea8
MD		 1583 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1584 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1585 NULL);
8f4905da
MD		 1586 if (consumerd64_libdir[0] != '\0') {
1587 free(tmpnew);
1588 }
1589 if (ret) {
1590 goto error;
1591 }
3bd1e081 1592 break;
7753dea8
MD		 1593 }
1594 case LTTNG_CONSUMER32_UST:
1595 {
937dde8e 1596 char *tmpnew = NULL;
8f4905da
MD		 1597
1598 if (consumerd32_libdir[0] != '\0') {
1599 char *tmp;
1600 size_t tmplen;
1601
1602 tmp = getenv("LD_LIBRARY_PATH");
1603 if (!tmp) {
1604 tmp = "";
1605 }
1606 tmplen = strlen("LD_LIBRARY_PATH=")
1607 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1608 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1609 if (!tmpnew) {
1610 ret = -ENOMEM;
1611 goto error;
1612 }
1613 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1614 strcat(tmpnew, consumerd32_libdir);
1615 if (tmp[0] != '\0') {
1616 strcat(tmpnew, ":");
1617 strcat(tmpnew, tmp);
1618 }
1619 ret = putenv(tmpnew);
1620 if (ret) {
1621 ret = -errno;
1622 goto error;
1623 }
1624 }
94c55f17 1625 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
fc7a59ce 1626 ret = execl(consumerd32_bin, verbosity, "-u",
7753dea8
MD		 1627 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1628 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1629 NULL);
8f4905da
MD		 1630 if (consumerd32_libdir[0] != '\0') {
1631 free(tmpnew);
1632 }
1633 if (ret) {
1634 goto error;
1635 }
7753dea8
MD		 1636 break;
1637 }
3bd1e081
MD		 1638 default:
1639 perror("unknown consumer type");
1640 exit(EXIT_FAILURE);
1641 }
8c0faa1d
DG		 1642 if (errno != 0) {
1643 perror("kernel start consumer exec");
1644 }
1645 exit(EXIT_FAILURE);
1646 } else if (pid > 0) {
1647 ret = pid;
8c0faa1d 1648 } else {
3bd1e081 1649 perror("start consumer fork");
8c0faa1d 1650 ret = -errno;
8c0faa1d 1651 }
8f4905da 1652error:
8c0faa1d
DG		 1653 return ret;
1654}
1655
693bd40b 1656/*
3bd1e081 1657 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1658 */
3bd1e081 1659static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1660{
1661 int ret;
1662
3bd1e081
MD		 1663 pthread_mutex_lock(&consumer_data->pid_mutex);
1664 if (consumer_data->pid != 0) {
1665 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1666 goto end;
1667 }
693bd40b 1668
3bd1e081 1669 ret = spawn_consumerd(consumer_data);
c49dc785 1670 if (ret < 0) {
3bd1e081
MD		 1671 ERR("Spawning consumerd failed");
1672 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1673 goto error;
693bd40b 1674 }
c49dc785 1675
3bd1e081
MD		 1676 /* Setting up the consumer_data pid */
1677 consumer_data->pid = ret;
48842b30 1678 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1679 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1680
3bd1e081
MD		 1681 DBG2("Spawning consumer control thread");
1682 ret = spawn_consumer_thread(consumer_data);
693bd40b 1683 if (ret < 0) {
3bd1e081 1684 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1685 goto error;
1686 }
1687
c49dc785 1688end:
693bd40b
DG		 1689 return 0;
1690
1691error:
1692 return ret;
1693}
1694
b73401da 1695/*
d063d709 1696 * modprobe_kernel_modules
b73401da
DG		 1697 */
1698static int modprobe_kernel_modules(void)
1699{
ab147185 1700 int ret = 0, i;
b73401da
DG		 1701 char modprobe[256];
1702
ab147185
MD		 1703 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1704 ret = snprintf(modprobe, sizeof(modprobe),
1705 "/sbin/modprobe %s%s",
24b487b8 1706 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1707 kernel_modules_list[i].name);
b73401da
DG		 1708 if (ret < 0) {
1709 perror("snprintf modprobe");
1710 goto error;
1711 }
ab147185 1712 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1713 ret = system(modprobe);
ab147185
MD		 1714 if (ret == -1) {
1715 ERR("Unable to launch modprobe for module %s",
1716 kernel_modules_list[i].name);
1717 } else if (kernel_modules_list[i].required
d9800920 1718 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1719 ERR("Unable to load module %s",
1720 kernel_modules_list[i].name);
1721 } else {
1722 DBG("Modprobe successfully %s",
1723 kernel_modules_list[i].name);
1724 }
1725 }
1726
1727error:
1728 return ret;
1729}
1730
b73401da 1731/*
d063d709 1732 * mount_debugfs
b73401da
DG		 1733 */
1734static int mount_debugfs(char *path)
1735{
1736 int ret;
1737 char *type = "debugfs";
1738
996b65c8 1739 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1740 if (ret < 0) {
7272acf5 1741 PERROR("Cannot create debugfs path");
b73401da
DG		 1742 goto error;
1743 }
1744
1745 ret = mount(type, path, type, 0, NULL);
1746 if (ret < 0) {
7272acf5 1747 PERROR("Cannot mount debugfs");
b73401da
DG		 1748 goto error;
1749 }
1750
1751 DBG("Mounted debugfs successfully at %s", path);
1752
1753error:
1754 return ret;
1755}
1756
8c0faa1d 1757/*
d063d709 1758 * Setup necessary data for kernel tracer action.
8c0faa1d 1759 */
f3ed775e 1760static void init_kernel_tracer(void)
8c0faa1d 1761{
b73401da
DG		 1762 int ret;
1763 char *proc_mounts = "/proc/mounts";
1764 char line[256];
684d34d2 1765 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1766 FILE *fp;
1767
1768 /* Detect debugfs */
1769 fp = fopen(proc_mounts, "r");
1770 if (fp == NULL) {
1771 ERR("Unable to probe %s", proc_mounts);
1772 goto error;
1773 }
1774
1775 while (fgets(line, sizeof(line), fp) != NULL) {
1776 if (strstr(line, "debugfs") != NULL) {
1777 /* Remove first string */
1778 strtok(line, " ");
1779 /* Dup string here so we can reuse line later on */
1780 debugfs_path = strdup(strtok(NULL, " "));
1781 DBG("Got debugfs path : %s", debugfs_path);
1782 break;
1783 }
1784 }
1785
1786 fclose(fp);
1787
1788 /* Mount debugfs if needded */
1789 if (debugfs_path == NULL) {
1790 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1791 if (ret < 0) {
1792 perror("asprintf debugfs path");
1793 goto error;
1794 }
1795 ret = mount_debugfs(debugfs_path);
1796 if (ret < 0) {
7272acf5 1797 perror("Cannot mount debugfs");
b73401da
DG		 1798 goto error;
1799 }
1800 }
1801
1802 /* Modprobe lttng kernel modules */
1803 ret = modprobe_kernel_modules();
1804 if (ret < 0) {
1805 goto error;
1806 }
1807
1808 /* Setup lttng kernel path */
1809 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1810 if (ret < 0) {
1811 perror("asprintf lttng path");
1812 goto error;
1813 }
1814
1815 /* Open debugfs lttng */
1816 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1817 if (kernel_tracer_fd < 0) {
b73401da
DG		 1818 DBG("Failed to open %s", lttng_path);
1819 goto error;
8c0faa1d
DG		 1820 }
1821
b73401da
DG		 1822 free(lttng_path);
1823 free(debugfs_path);
f3ed775e 1824 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1825 return;
1826
1827error:
1828 if (lttng_path) {
1829 free(lttng_path);
1830 }
1831 if (debugfs_path) {
1832 free(debugfs_path);
1833 }
1834 WARN("No kernel tracer available");
1835 kernel_tracer_fd = 0;
1836 return;
f3ed775e 1837}
33a2b854 1838
f3ed775e 1839/*
54d01ffb 1840 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1841 */
54d01ffb 1842static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1843{
f40799e8 1844 int ret = 0;
8c0faa1d 1845
3bd1e081 1846 if (session->consumer_fds_sent == 0) {
d9800920 1847 /*
54d01ffb
DG		 1848 * Assign default kernel consumer socket if no consumer assigned to the
1849 * kernel session. At this point, it's NOT suppose to be 0 but this is
1850 * an extra security check.
d9800920
DG		 1851 */
1852 if (session->consumer_fd == 0) {
3bd1e081 1853 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1854 }
1855
2bdd86d4 1856 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1857 if (ret < 0) {
f3ed775e
DG		 1858 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1859 goto error;
1860 }
1d4b027a 1861
3bd1e081 1862 session->consumer_fds_sent = 1;
f3ed775e 1863 }
1d4b027a
DG		 1864
1865error:
1866 return ret;
8c0faa1d
DG		 1867}
1868
0177d773
DG		 1869/*
1870 * Create an UST session and add it to the session ust list.
1871 */
44d3bd01
DG		 1872static int create_ust_session(struct ltt_session *session,
1873 struct lttng_domain *domain)
0177d773 1874{
44d3bd01 1875 int ret;
48842b30 1876 unsigned int uid;
13384287 1877 struct ltt_ust_session *lus = NULL;
44d3bd01
DG		 1878
1879 switch (domain->type) {
48842b30 1880 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1881 break;
1882 default:
13384287 1883 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1884 goto error;
1885 }
0177d773
DG		 1886
1887 DBG("Creating UST session");
1888
44e96653 1889 uid = session->uid;
48842b30 1890 lus = trace_ust_create_session(session->path, uid, domain);
0177d773 1891 if (lus == NULL) {
44d3bd01 1892 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1893 goto error;
1894 }
1895
48842b30 1896 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
0177d773
DG		 1897 geteuid(), allowed_group());
1898 if (ret < 0) {
1899 if (ret != -EEXIST) {
1900 ERR("Trace directory creation error");
44d3bd01 1901 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1902 goto error;
1903 }
1904 }
1905
f6a9efaa
DG		 1906 /* The domain type dictate different actions on session creation */
1907 switch (domain->type) {
48842b30
DG		 1908 case LTTNG_DOMAIN_UST:
1909 /* No ustctl for the global UST domain */
1910 break;
1911 default:
36dc12cc 1912 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1913 goto error;
0177d773 1914 }
f6a9efaa 1915 session->ust_session = lus;
44d3bd01
DG		 1916
1917 return LTTCOMM_OK;
0177d773
DG		 1918
1919error:
1920 free(lus);
1921 return ret;
1922}
1923
333f285e 1924/*
d063d709 1925 * Create a kernel tracer session then create the default channel.
333f285e 1926 */
f3ed775e 1927static int create_kernel_session(struct ltt_session *session)
333f285e 1928{
f3ed775e 1929 int ret;
f3ed775e
DG		 1930
1931 DBG("Creating kernel session");
1932
1933 ret = kernel_create_session(session, kernel_tracer_fd);
1934 if (ret < 0) {
1935 ret = LTTCOMM_KERN_SESS_FAIL;
1936 goto error;
333f285e
DG		 1937 }
1938
d9800920 1939 /* Set kernel consumer socket fd */
3bd1e081
MD		 1940 if (kconsumer_data.cmd_sock) {
1941 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1942 }
1943
63053e7c
DG		 1944 ret = mkdir_recursive(session->kernel_session->trace_path,
1945 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
7a485870 1946 if (ret < 0) {
996b65c8 1947 if (ret != -EEXIST) {
7a485870
DG		 1948 ERR("Trace directory creation error");
1949 goto error;
1950 }
1951 }
1952
f3ed775e
DG		 1953error:
1954 return ret;
333f285e
DG		 1955}
1956
6c9cc2ab
DG		 1957/*
1958 * Using the session list, filled a lttng_session array to send back to the
1959 * client for session listing.
1960 *
1961 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1962 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG		 1963 */
1964static void list_lttng_sessions(struct lttng_session *sessions)
1965{
1966 int i = 0;
1967 struct ltt_session *session;
1968
1969 DBG("Getting all available session");
1970 /*
1971 * Iterate over session list and append data after the control struct in
1972 * the buffer.
1973 */
1974 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1975 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1976 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1977 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1978 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1979 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1980 i++;
1981 }
1982}
1983
9f19cc17
DG		 1984/*
1985 * Fill lttng_channel array of all channels.
1986 */
b551a063 1987static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1988 struct lttng_channel *channels)
1989{
1990 int i = 0;
1991 struct ltt_kernel_channel *kchan;
1992
1993 DBG("Listing channels for session %s", session->name);
1994
b551a063
DG		 1995 switch (domain) {
1996 case LTTNG_DOMAIN_KERNEL:
1997 /* Kernel channels */
1998 if (session->kernel_session != NULL) {
1999 cds_list_for_each_entry(kchan,
2000 &session->kernel_session->channel_list.head, list) {
2001 /* Copy lttng_channel struct to array */
2002 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2003 channels[i].enabled = kchan->enabled;
2004 i++;
2005 }
2006 }
2007 break;
2008 case LTTNG_DOMAIN_UST:
2009 {
2010 struct cds_lfht_iter iter;
2011 struct ltt_ust_channel *uchan;
2012
2013 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2014 &iter, uchan, node) {
2015 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2016 channels[i].attr.overwrite = uchan->attr.overwrite;
2017 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2018 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2019 channels[i].attr.switch_timer_interval =
2020 uchan->attr.switch_timer_interval;
2021 channels[i].attr.read_timer_interval =
2022 uchan->attr.read_timer_interval;
aea829b3 2023 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2024 switch (uchan->attr.output) {
2025 case LTTNG_UST_MMAP:
2026 default:
2027 channels[i].attr.output = LTTNG_EVENT_MMAP;
2028 break;
2029 }
befe0905 2030 i++;
b551a063
DG		 2031 }
2032 break;
2033 }
2034 default:
2035 break;
2036 }
2037}
2038
2039/*
2040 * Create a list of ust global domain events.
2041 */
2042static int list_lttng_ust_global_events(char *channel_name,
2043 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2044{
2045 int i = 0, ret = 0;
2046 unsigned int nb_event = 0;
2047 struct cds_lfht_iter iter;
d7b75b30 2048 struct cds_lfht_node *node;
b551a063
DG		 2049 struct ltt_ust_channel *uchan;
2050 struct ltt_ust_event *uevent;
2051 struct lttng_event *tmp;
2052
2053 DBG("Listing UST global events for channel %s", channel_name);
2054
2055 rcu_read_lock();
2056
d7b75b30
DG		 2057 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2058 strlen(channel_name), &iter);
2059 if (node == NULL) {
2060 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2061 goto error;
b551a063
DG		 2062 }
2063
d7b75b30
DG		 2064 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2065
2066 nb_event += hashtable_get_count(uchan->events);
2067
b551a063
DG		 2068 if (nb_event == 0) {
2069 ret = nb_event;
2070 goto error;
2071 }
2072
2073 DBG3("Listing UST global %d events", nb_event);
2074
2075 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2076 if (tmp == NULL) {
2077 ret = -LTTCOMM_FATAL;
2078 goto error;
2079 }
2080
d7b75b30
DG		 2081 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2082 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2083 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2084 tmp[i].enabled = uevent->enabled;
2085 switch (uevent->attr.instrumentation) {
2086 case LTTNG_UST_TRACEPOINT:
2087 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2088 break;
2089 case LTTNG_UST_PROBE:
2090 tmp[i].type = LTTNG_EVENT_PROBE;
2091 break;
2092 case LTTNG_UST_FUNCTION:
2093 tmp[i].type = LTTNG_EVENT_FUNCTION;
2094 break;
ac3bd9c0 2095 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2096 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2097 break;
9f19cc17 2098 }
d7b75b30 2099 i++;
9f19cc17
DG		 2100 }
2101
b551a063
DG		 2102 ret = nb_event;
2103 *events = tmp;
2104
2105error:
2106 rcu_read_unlock();
2107 return ret;
9f19cc17
DG		 2108}
2109
2110/*
b551a063 2111 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2112 */
b551a063
DG		 2113static int list_lttng_kernel_events(char *channel_name,
2114 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2115{
b551a063
DG		 2116 int i = 0, ret;
2117 unsigned int nb_event;
9f19cc17 2118 struct ltt_kernel_event *event;
b551a063
DG		 2119 struct ltt_kernel_channel *kchan;
2120
2121 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2122 if (kchan == NULL) {
2123 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2124 goto error;
2125 }
2126
2127 nb_event = kchan->event_count;
9f19cc17
DG		 2128
2129 DBG("Listing events for channel %s", kchan->channel->name);
2130
b551a063
DG		 2131 if (nb_event == 0) {
2132 ret = nb_event;
2133 goto error;
2134 }
2135
2136 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2137 if (*events == NULL) {
2138 ret = LTTCOMM_FATAL;
2139 goto error;
2140 }
2141
9f19cc17
DG		 2142 /* Kernel channels */
2143 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2144 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2145 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2146 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2147 switch (event->event->instrumentation) {
2148 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2149 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2150 break;
2151 case LTTNG_KERNEL_KPROBE:
2152 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2153 (*events)[i].type = LTTNG_EVENT_PROBE;
2154 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2155 sizeof(struct lttng_kernel_kprobe));
2156 break;
2157 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2158 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2159 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2160 sizeof(struct lttng_kernel_function));
2161 break;
0133c199 2162 case LTTNG_KERNEL_NOOP:
b551a063 2163 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2164 break;
a54bd42d 2165 case LTTNG_KERNEL_SYSCALL:
b551a063 2166 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2167 break;
7a3d1328
MD		 2168 case LTTNG_KERNEL_ALL:
2169 assert(0);
2170 break;
9f19cc17
DG		 2171 }
2172 i++;
2173 }
b551a063
DG		 2174
2175 return nb_event;
2176
2177error:
2178 return ret;
9f19cc17
DG		 2179}
2180
fac6795d 2181/*
54d01ffb 2182 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2183 */
54d01ffb
DG		 2184static int cmd_disable_channel(struct ltt_session *session,
2185 int domain, char *channel_name)
fac6795d 2186{
54d01ffb 2187 int ret;
78f0bacd
DG		 2188 struct ltt_ust_session *usess;
2189
2190 usess = session->ust_session;
379473d2 2191
54d01ffb 2192 switch (domain) {
78f0bacd
DG		 2193 case LTTNG_DOMAIN_KERNEL:
2194 {
2195 ret = channel_kernel_disable(session->kernel_session,
2196 channel_name);
2197 if (ret != LTTCOMM_OK) {
2198 goto error;
2199 }
54d01ffb 2200
78f0bacd
DG		 2201 kernel_wait_quiescent(kernel_tracer_fd);
2202 break;
2203 }
2204 case LTTNG_DOMAIN_UST:
2205 {
2206 struct ltt_ust_channel *uchan;
2207
2208 /* Get channel in global UST domain HT */
2209 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2210 channel_name);
2211 if (uchan == NULL) {
2212 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2213 goto error;
78f0bacd
DG		 2214 }
2215
8535a6d9
DG		 2216 /* Already disabled */
2217 if (!uchan->enabled) {
2218 DBG2("UST channel %s already disabled", channel_name);
2219 break;
2220 }
2221
35a9059d 2222 ret = ust_app_disable_channel_glb(usess, uchan);
78f0bacd
DG		 2223 if (ret < 0) {
2224 ret = LTTCOMM_UST_DISABLE_FAIL;
2225 goto error;
2226 }
2227
2228 uchan->enabled = 0;
2229
2230 break;
2231 }
2232 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2233 case LTTNG_DOMAIN_UST_EXEC_NAME:
2234 case LTTNG_DOMAIN_UST_PID:
2235 ret = LTTCOMM_NOT_IMPLEMENTED;
2236 goto error;
2237 default:
2238 ret = LTTCOMM_UNKNOWN_DOMAIN;
2239 goto error;
20fe2104
DG		 2240 }
2241
54d01ffb 2242 ret = LTTCOMM_OK;
d65106b1 2243
54d01ffb
DG		 2244error:
2245 return ret;
2246}
2247
56fff090
DG		 2248/*
2249 * Copy channel from attributes and set it in the application channel list.
2250 */
f6a9efaa 2251/*
56fff090
DG		 2252static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2253 struct lttng_channel *attr, struct ust_app *app)
2254{
2255 int ret;
2256 struct ltt_ust_channel *uchan, *new_chan;
2257
f6a9efaa 2258 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
56fff090
DG		 2259 if (uchan == NULL) {
2260 ret = LTTCOMM_FATAL;
2261 goto error;
2262 }
2263
2264 new_chan = trace_ust_create_channel(attr, usess->path);
2265 if (new_chan == NULL) {
2266 PERROR("malloc ltt_ust_channel");
2267 ret = LTTCOMM_FATAL;
2268 goto error;
2269 }
2270
2271 ret = channel_ust_copy(new_chan, uchan);
2272 if (ret < 0) {
2273 ret = LTTCOMM_FATAL;
2274 goto error;
2275 }
2276
56fff090
DG		 2277error:
2278 return ret;
2279}
f6a9efaa 2280*/
56fff090 2281
54d01ffb
DG		 2282/*
2283 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2284 */
44d3bd01 2285static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2286 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2287{
2288 int ret;
f6a9efaa
DG		 2289 struct ltt_ust_session *usess = session->ust_session;
2290
5d56b5aa 2291 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2292
aea829b3 2293 switch (domain) {
44d3bd01
DG		 2294 case LTTNG_DOMAIN_KERNEL:
2295 {
2296 struct ltt_kernel_channel *kchan;
54d01ffb 2297
44d3bd01
DG		 2298 kchan = trace_kernel_get_channel_by_name(attr->name,
2299 session->kernel_session);
2300 if (kchan == NULL) {
2301 ret = channel_kernel_create(session->kernel_session,
2302 attr, kernel_poll_pipe[1]);
2303 } else {
2304 ret = channel_kernel_enable(session->kernel_session, kchan);
2305 }
2306
2307 if (ret != LTTCOMM_OK) {
2308 goto error;
2309 }
2310
2311 kernel_wait_quiescent(kernel_tracer_fd);
2312 break;
2313 }
f6a9efaa
DG		 2314 case LTTNG_DOMAIN_UST:
2315 {
2316 struct ltt_ust_channel *uchan;
2317
48842b30 2318 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
f6a9efaa 2319
48842b30 2320 /* Get channel in global UST domain HT */
f6a9efaa
DG		 2321 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2322 attr->name);
2323 if (uchan == NULL) {
48842b30 2324 uchan = trace_ust_create_channel(attr, usess->pathname);
f6a9efaa
DG		 2325 if (uchan == NULL) {
2326 ret = LTTCOMM_UST_CHAN_FAIL;
2327 goto error;
2328 }
d5cd1f34 2329
78f0bacd 2330 /* Add channel to all registered applications */
35a9059d 2331 ret = ust_app_create_channel_glb(usess, uchan);
78f0bacd
DG		 2332 if (ret != 0) {
2333 ret = LTTCOMM_UST_CHAN_FAIL;
2334 goto error;
2335 }
8535a6d9
DG		 2336
2337 rcu_read_lock();
2338 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2339 rcu_read_unlock();
2340
2341 DBG2("UST channel %s added to global domain HT", attr->name);
f6a9efaa 2342 } else {
78f0bacd
DG		 2343 /* If already enabled, everything is OK */
2344 if (uchan->enabled) {
8535a6d9 2345 break;
78f0bacd 2346 }
f6a9efaa 2347
35a9059d 2348 ret = ust_app_enable_channel_glb(usess, uchan);
78f0bacd 2349 if (ret < 0) {
8535a6d9
DG		 2350 if (ret != -EEXIST) {
2351 ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
2352 goto error;
2353 } else {
2354 ret = LTTCOMM_OK;
2355 }
78f0bacd 2356 }
48842b30 2357 }
f6a9efaa 2358
37357452
DG		 2359 uchan->enabled = 1;
2360
f6a9efaa
DG		 2361 break;
2362 }
78f0bacd
DG		 2363 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2364 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2365 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG		 2366 ret = LTTCOMM_NOT_IMPLEMENTED;
2367 goto error;
44d3bd01
DG		 2368 default:
2369 ret = LTTCOMM_UNKNOWN_DOMAIN;
2370 goto error;
54d01ffb
DG		 2371 }
2372
2373 ret = LTTCOMM_OK;
2374
2375error:
2376 return ret;
2377}
2378
2379/*
2380 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2381 */
2382static int cmd_disable_event(struct ltt_session *session, int domain,
2383 char *channel_name, char *event_name)
2384{
2385 int ret;
54d01ffb
DG		 2386
2387 switch (domain) {
2388 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2389 {
2390 struct ltt_kernel_channel *kchan;
b0a40d28 2391 struct ltt_kernel_session *ksess;
2bdd86d4 2392
b0a40d28
DG		 2393 ksess = session->kernel_session;
2394
2395 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2396 if (kchan == NULL) {
2397 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2398 goto error;
d65106b1
DG		 2399 }
2400
b0a40d28 2401 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2402 if (ret != LTTCOMM_OK) {
2403 goto error;
2404 }
2405
2406 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2407 break;
2bdd86d4
MD		 2408 }
2409 case LTTNG_DOMAIN_UST:
b0a40d28
DG		 2410 {
2411 struct ltt_ust_session *usess;
2412 struct ltt_ust_channel *uchan;
35a9059d 2413 struct ltt_ust_event *uevent;
b0a40d28
DG		 2414
2415 usess = session->ust_session;
2416
2417 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2418 channel_name);
2419 if (uchan == NULL) {
2420 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2421 goto error;
2422 }
2423
35a9059d
DG		 2424 uevent = trace_ust_find_event_by_name(uchan->events, event_name);
2425 if (uevent == NULL) {
2426 ret = LTTCOMM_UST_EVENT_NOT_FOUND;
2427 goto error;
2428 }
2429
2430 ret = ust_app_disable_event_glb(usess, uchan, uevent);
b0a40d28
DG		 2431 if (ret < 0) {
2432 ret = LTTCOMM_UST_DISABLE_FAIL;
2433 goto error;
2434 }
2435
35a9059d
DG		 2436 uevent->enabled = 0;
2437
b0a40d28
DG		 2438 DBG2("Disable UST event %s in channel %s completed", event_name,
2439 channel_name);
2440
2441 break;
2442 }
2bdd86d4
MD		 2443 case LTTNG_DOMAIN_UST_EXEC_NAME:
2444 case LTTNG_DOMAIN_UST_PID:
2445 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2446 default:
54d01ffb
DG		 2447 ret = LTTCOMM_NOT_IMPLEMENTED;
2448 goto error;
d65106b1 2449 }
26cc6b4e 2450
54d01ffb
DG		 2451 ret = LTTCOMM_OK;
2452
2453error:
2454 return ret;
2455}
2456
2457/*
2458 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2459 */
2460static int cmd_disable_event_all(struct ltt_session *session, int domain,
2461 char *channel_name)
2462{
2463 int ret;
54d01ffb
DG		 2464
2465 switch (domain) {
2466 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2467 {
2468 struct ltt_kernel_session *ksess;
2469 struct ltt_kernel_channel *kchan;
2470
2471 ksess = session->kernel_session;
2472
2473 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2474 if (kchan == NULL) {
2475 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2476 goto error;
26cc6b4e
DG		 2477 }
2478
9730260e 2479 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2480 if (ret != LTTCOMM_OK) {
0b97ec54 2481 goto error;
26cc6b4e
DG		 2482 }
2483
54d01ffb 2484 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2485 break;
9730260e
DG		 2486 }
2487 case LTTNG_DOMAIN_UST:
2488 {
2489 struct ltt_ust_session *usess;
2490 struct ltt_ust_channel *uchan;
2491
2492 usess = session->ust_session;
2493
2494 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2495 channel_name);
2496 if (uchan == NULL) {
2497 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2498 goto error;
2499 }
2500
35a9059d 2501 ret = ust_app_disable_all_event_glb(usess, uchan);
9730260e
DG		 2502 if (ret < 0) {
2503 ret = LTTCOMM_UST_DISABLE_FAIL;
2504 goto error;
2505 }
2506
2507 DBG2("Disable all UST event in channel %s completed", channel_name);
2508
2509 break;
2510 }
2511 case LTTNG_DOMAIN_UST_EXEC_NAME:
2512 case LTTNG_DOMAIN_UST_PID:
2513 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2514 default:
54d01ffb
DG		 2515 ret = LTTCOMM_NOT_IMPLEMENTED;
2516 goto error;
26cc6b4e 2517 }
e953ef25 2518
54d01ffb 2519 ret = LTTCOMM_OK;
e953ef25 2520
54d01ffb
DG		 2521error:
2522 return ret;
2523}
f5177a38 2524
54d01ffb
DG		 2525/*
2526 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2527 */
2528static int cmd_add_context(struct ltt_session *session, int domain,
2529 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2530{
2531 int ret;
f5177a38 2532
54d01ffb
DG		 2533 switch (domain) {
2534 case LTTNG_DOMAIN_KERNEL:
2535 /* Add kernel context to kernel tracer */
2536 ret = context_kernel_add(session->kernel_session, ctx,
2537 event_name, channel_name);
2538 if (ret != LTTCOMM_OK) {
f5177a38 2539 goto error;
e953ef25 2540 }
2bdd86d4
MD		 2541 break;
2542 case LTTNG_DOMAIN_UST:
2543 {
55cc08a6 2544 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2545
55cc08a6
DG		 2546 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2547 if (ret != LTTCOMM_OK) {
2548 goto error;
2bdd86d4 2549 }
e953ef25 2550 break;
2bdd86d4 2551 }
55cc08a6
DG		 2552 case LTTNG_DOMAIN_UST_EXEC_NAME:
2553 case LTTNG_DOMAIN_UST_PID:
2554 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2555 default:
54d01ffb
DG		 2556 ret = LTTCOMM_NOT_IMPLEMENTED;
2557 goto error;
e953ef25 2558 }
950131af 2559
54d01ffb 2560 ret = LTTCOMM_OK;
950131af 2561
54d01ffb
DG		 2562error:
2563 return ret;
2564}
2565
2566/*
2567 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD		 2568 *
2569 * TODO: currently, both events and loglevels are kept within the same
2570 * namespace for UST global registry/app registery, so if an event
2571 * happen to have the same name as the loglevel (very unlikely though),
2572 * and an attempt is made to enable/disable both in the same session,
2573 * the first to be created will be the only one allowed to exist.
54d01ffb
DG		 2574 */
2575static int cmd_enable_event(struct ltt_session *session, int domain,
2576 char *channel_name, struct lttng_event *event)
2577{
2578 int ret;
f6cd6b0f 2579 struct lttng_channel *attr;
48842b30 2580 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2581
2582 switch (domain) {
2583 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2584 {
2585 struct ltt_kernel_channel *kchan;
2586
54d01ffb
DG		 2587 kchan = trace_kernel_get_channel_by_name(channel_name,
2588 session->kernel_session);
2589 if (kchan == NULL) {
f6cd6b0f
DG		 2590 attr = channel_new_default_attr(domain);
2591 if (attr == NULL) {
2592 ret = LTTCOMM_FATAL;
2593 goto error;
2594 }
2595 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2596
54d01ffb 2597 /* This call will notify the kernel thread */
44d3bd01 2598 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2599 attr, kernel_poll_pipe[1]);
54d01ffb 2600 if (ret != LTTCOMM_OK) {
ff4d74e6 2601 free(attr);
f5177a38
DG		 2602 goto error;
2603 }
ff4d74e6 2604 free(attr);
54d01ffb 2605 }
950131af 2606
54d01ffb
DG		 2607 /* Get the newly created kernel channel pointer */
2608 kchan = trace_kernel_get_channel_by_name(channel_name,
2609 session->kernel_session);
2610 if (kchan == NULL) {
2611 /* This sould not happen... */
2612 ret = LTTCOMM_FATAL;
2613 goto error;
2614 }
f5177a38 2615
48842b30
DG		 2616 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2617 event);
54d01ffb 2618 if (ret != LTTCOMM_OK) {
f5177a38 2619 goto error;
950131af
DG		 2620 }
2621
54d01ffb 2622 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2623 break;
2bdd86d4
MD		 2624 }
2625 case LTTNG_DOMAIN_UST:
2626 {
aea829b3 2627 struct lttng_channel *attr;
edb67388 2628 struct ltt_ust_channel *uchan;
2bdd86d4 2629
edb67388 2630 /* Get channel from global UST domain */
48842b30
DG		 2631 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2632 channel_name);
2633 if (uchan == NULL) {
aea829b3
DG		 2634 /* Create default channel */
2635 attr = channel_new_default_attr(domain);
2636 if (attr == NULL) {
2637 ret = LTTCOMM_FATAL;
2638 goto error;
2639 }
596219f7 2640 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2641 attr->name[NAME_MAX - 1] = '\0';
aea829b3
DG		 2642
2643 /* Use the internal command enable channel */
2644 ret = cmd_enable_channel(session, domain, attr);
edb67388 2645 if (ret != LTTCOMM_OK) {
ff4d74e6 2646 free(attr);
aea829b3
DG		 2647 goto error;
2648 }
aea829b3
DG		 2649 free(attr);
2650
2651 /* Get the newly created channel reference back */
2652 uchan = trace_ust_find_channel_by_name(
2653 usess->domain_global.channels, channel_name);
2654 if (uchan == NULL) {
2655 /* Something is really wrong */
2656 ret = LTTCOMM_FATAL;
2657 goto error;
2658 }
48842b30 2659 }
2bdd86d4 2660
edb67388 2661 /* At this point, the session and channel exist on the tracer */
d5cd1f34 2662
edb67388
DG		 2663 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2664 if (ret != LTTCOMM_OK) {
48842b30 2665 goto error;
2bdd86d4
MD		 2666 }
2667 break;
2668 }
2669 case LTTNG_DOMAIN_UST_EXEC_NAME:
2670 case LTTNG_DOMAIN_UST_PID:
2671 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2672 default:
54d01ffb
DG		 2673 ret = LTTCOMM_NOT_IMPLEMENTED;
2674 goto error;
950131af 2675 }
d36b8583 2676
54d01ffb 2677 ret = LTTCOMM_OK;
d36b8583 2678
54d01ffb
DG		 2679error:
2680 return ret;
2681}
7d29a247 2682
54d01ffb
DG		 2683/*
2684 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2685 */
2686static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2687 char *channel_name, int event_type)
54d01ffb
DG		 2688{
2689 int ret;
2690 struct ltt_kernel_channel *kchan;
7d29a247 2691
54d01ffb
DG		 2692 switch (domain) {
2693 case LTTNG_DOMAIN_KERNEL:
2694 kchan = trace_kernel_get_channel_by_name(channel_name,
2695 session->kernel_session);
2696 if (kchan == NULL) {
2697 /* This call will notify the kernel thread */
44d3bd01
DG		 2698 ret = channel_kernel_create(session->kernel_session, NULL,
2699 kernel_poll_pipe[1]);
54d01ffb
DG		 2700 if (ret != LTTCOMM_OK) {
2701 goto error;
d36b8583 2702 }
0d0c377a 2703
8f69e5eb
DG		 2704 /* Get the newly created kernel channel pointer */
2705 kchan = trace_kernel_get_channel_by_name(channel_name,
2706 session->kernel_session);
2707 if (kchan == NULL) {
2708 /* This sould not happen... */
2709 ret = LTTCOMM_FATAL;
2710 goto error;
2711 }
2712
54d01ffb 2713 }
0fdd1e2c 2714
7a3d1328
MD		 2715 switch (event_type) {
2716 case LTTNG_KERNEL_SYSCALL:
2717 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2718 kchan, kernel_tracer_fd);
7a3d1328
MD		 2719 break;
2720 case LTTNG_KERNEL_TRACEPOINT:
8c9ae521 2721 /*
7a3d1328
MD		 2722 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2723 * events already registered to the channel.
8c9ae521 2724 */
7a3d1328
MD		 2725 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2726 kchan, kernel_tracer_fd);
2727 break;
2728 case LTTNG_KERNEL_ALL:
2729 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2730 ret = event_kernel_enable_all(session->kernel_session,
2731 kchan, kernel_tracer_fd);
7a3d1328
MD		 2732 break;
2733 default:
2734 ret = LTTCOMM_KERN_ENABLE_FAIL;
2735 goto error;
8c9ae521 2736 }
8f69e5eb
DG		 2737
2738 /* Manage return value */
54d01ffb 2739 if (ret != LTTCOMM_OK) {
0d0c377a 2740 goto error;
d36b8583
DG		 2741 }
2742
54d01ffb 2743 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2744 break;
54d01ffb
DG		 2745 default:
2746 /* TODO: Userspace tracing */
2747 ret = LTTCOMM_NOT_IMPLEMENTED;
2748 goto error;
d36b8583 2749 }
f3ed775e 2750
54d01ffb
DG		 2751 ret = LTTCOMM_OK;
2752
2753error:
2754 return ret;
2755}
2756
2757/*
2758 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2759 */
2760static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2761{
2762 int ret;
2763 ssize_t nb_events = 0;
2764
2765 switch (domain) {
2766 case LTTNG_DOMAIN_KERNEL:
2767 nb_events = kernel_list_events(kernel_tracer_fd, events);
2768 if (nb_events < 0) {
2769 ret = LTTCOMM_KERN_LIST_FAIL;
2770 goto error;
894be886 2771 }
54d01ffb 2772 break;
b551a063
DG		 2773 case LTTNG_DOMAIN_UST:
2774 nb_events = ust_app_list_events(events);
2775 if (nb_events < 0) {
2776 ret = LTTCOMM_UST_LIST_FAIL;
2777 goto error;
2778 }
2779 break;
54d01ffb 2780 default:
54d01ffb
DG		 2781 ret = LTTCOMM_NOT_IMPLEMENTED;
2782 goto error;
2783 }
894be886 2784
54d01ffb 2785 return nb_events;
7d29a247 2786
54d01ffb
DG		 2787error:
2788 /* Return negative value to differentiate return code */
2789 return -ret;
2790}
b389abbe 2791
54d01ffb
DG		 2792/*
2793 * Command LTTNG_START_TRACE processed by the client thread.
2794 */
2795static int cmd_start_trace(struct ltt_session *session)
2796{
2797 int ret;
54d01ffb 2798 struct ltt_kernel_session *ksession;
b9d9b220 2799 struct ltt_ust_session *usess;
b389abbe 2800
54d01ffb
DG		 2801 /* Short cut */
2802 ksession = session->kernel_session;
b9d9b220 2803 usess = session->ust_session;
5eb91c98 2804
464dd62d
MD		 2805 if (session->enabled)
2806 return LTTCOMM_UST_START_FAIL;
2807 session->enabled = 1;
2808
54d01ffb
DG		 2809 /* Kernel tracing */
2810 if (ksession != NULL) {
2bdd86d4
MD		 2811 struct ltt_kernel_channel *kchan;
2812
54d01ffb
DG		 2813 /* Open kernel metadata */
2814 if (ksession->metadata == NULL) {
2815 ret = kernel_open_metadata(ksession, ksession->trace_path);
2816 if (ret < 0) {
2817 ret = LTTCOMM_KERN_META_FAIL;
2818 goto error;
b389abbe 2819 }
54d01ffb 2820 }
7d29a247 2821
54d01ffb
DG		 2822 /* Open kernel metadata stream */
2823 if (ksession->metadata_stream_fd == 0) {
2824 ret = kernel_open_metadata_stream(ksession);
2825 if (ret < 0) {
2826 ERR("Kernel create metadata stream failed");
2827 ret = LTTCOMM_KERN_STREAM_FAIL;
2828 goto error;
2829 }
2830 }
2831
2832 /* For each channel */
2833 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2834 if (kchan->stream_count == 0) {
2835 ret = kernel_open_channel_stream(kchan);
2836 if (ret < 0) {
2837 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2838 goto error;
2839 }
54d01ffb
DG		 2840 /* Update the stream global counter */
2841 ksession->stream_count_global += ret;
7d29a247 2842 }
54d01ffb
DG		 2843 }
2844
2845 /* Setup kernel consumer socket and send fds to it */
2846 ret = init_kernel_tracing(ksession);
2847 if (ret < 0) {
2848 ret = LTTCOMM_KERN_START_FAIL;
2849 goto error;
2850 }
2851
2852 /* This start the kernel tracing */
2853 ret = kernel_start_session(ksession);
2854 if (ret < 0) {
2855 ret = LTTCOMM_KERN_START_FAIL;
2856 goto error;
2857 }
2858
2859 /* Quiescent wait after starting trace */
2860 kernel_wait_quiescent(kernel_tracer_fd);
2861 }
2862
36dc12cc 2863 /* Flag session that trace should start automatically */
b9d9b220
DG		 2864 if (usess) {
2865 usess->start_trace = 1;
36dc12cc 2866
b9d9b220
DG		 2867 ret = ust_app_start_trace_all(usess);
2868 if (ret < 0) {
2869 ret = LTTCOMM_UST_START_FAIL;
2870 goto error;
2871 }
2bdd86d4 2872 }
54d01ffb
DG		 2873
2874 ret = LTTCOMM_OK;
2875
2876error:
2877 return ret;
2878}
2879
2880/*
2881 * Command LTTNG_STOP_TRACE processed by the client thread.
2882 */
2883static int cmd_stop_trace(struct ltt_session *session)
2884{
2885 int ret;
2886 struct ltt_kernel_channel *kchan;
2887 struct ltt_kernel_session *ksession;
8be98f9a 2888 struct ltt_ust_session *usess;
54d01ffb
DG		 2889
2890 /* Short cut */
2891 ksession = session->kernel_session;
8be98f9a 2892 usess = session->ust_session;
54d01ffb 2893
464dd62d
MD		 2894 if (!session->enabled)
2895 return LTTCOMM_UST_START_FAIL;
2896 session->enabled = 0;
2897
54d01ffb
DG		 2898 /* Kernel tracer */
2899 if (ksession != NULL) {
2900 DBG("Stop kernel tracing");
2901
2902 /* Flush all buffers before stopping */
2903 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2904 if (ret < 0) {
2905 ERR("Kernel metadata flush failed");
2906 }
f34daff7 2907
54d01ffb
DG		 2908 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2909 ret = kernel_flush_buffer(kchan);
0d0c377a 2910 if (ret < 0) {
54d01ffb 2911 ERR("Kernel flush buffer error");
7d29a247 2912 }
54d01ffb 2913 }
19e70852 2914
54d01ffb
DG		 2915 ret = kernel_stop_session(ksession);
2916 if (ret < 0) {
2917 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2918 goto error;
f3ed775e 2919 }
54d01ffb
DG		 2920
2921 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2922 }
54d01ffb 2923
8be98f9a
MD		 2924 if (usess) {
2925 usess->start_trace = 0;
2bdd86d4 2926
8be98f9a 2927 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2928 if (ret < 0) {
8be98f9a 2929 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD		 2930 goto error;
2931 }
2bdd86d4 2932 }
54d01ffb
DG		 2933
2934 ret = LTTCOMM_OK;
2935
2936error:
2937 return ret;
2938}
2939
2940/*
2941 * Command LTTNG_CREATE_SESSION processed by the client thread.
2942 */
2943static int cmd_create_session(char *name, char *path)
2944{
2945 int ret;
2946
2947 ret = session_create(name, path);
2948 if (ret != LTTCOMM_OK) {
2949 goto error;
2950 }
2951
2952 ret = LTTCOMM_OK;
2953
2954error:
2955 return ret;
2956}
2957
2958/*
2959 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2960 */
2961static int cmd_destroy_session(struct ltt_session *session, char *name)
2962{
2963 int ret;
2964
2965 /* Clean kernel session teardown */
2966 teardown_kernel_session(session);
84cd17c6
MD		 2967 /* UST session teardown */
2968 teardown_ust_session(session);
54d01ffb
DG		 2969
2970 /*
2971 * Must notify the kernel thread here to update it's poll setin order
2972 * to remove the channel(s)' fd just destroyed.
2973 */
2974 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2975 if (ret < 0) {
2976 perror("write kernel poll pipe");
2977 }
2978
271933a4 2979 ret = session_destroy(session);
54d01ffb
DG		 2980
2981 return ret;
2982}
2983
2984/*
2985 * Command LTTNG_CALIBRATE processed by the client thread.
2986 */
2987static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2988{
2989 int ret;
2990
2991 switch (domain) {
2992 case LTTNG_DOMAIN_KERNEL:
33a2b854 2993 {
54d01ffb 2994 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2995
54d01ffb
DG		 2996 kcalibrate.type = calibrate->type;
2997 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2998 if (ret < 0) {
54d01ffb
DG		 2999 ret = LTTCOMM_KERN_ENABLE_FAIL;
3000 goto error;
33a2b854 3001 }
54d01ffb
DG		 3002 break;
3003 }
3004 default:
3005 /* TODO: Userspace tracing */
3006 ret = LTTCOMM_NOT_IMPLEMENTED;
3007 goto error;
3008 }
33a2b854 3009
54d01ffb 3010 ret = LTTCOMM_OK;
33a2b854 3011
54d01ffb
DG		 3012error:
3013 return ret;
3014}
7d29a247 3015
54d01ffb
DG		 3016/*
3017 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3018 */
3019static int cmd_register_consumer(struct ltt_session *session, int domain,
3020 char *sock_path)
3021{
3022 int ret, sock;
b389abbe 3023
54d01ffb
DG		 3024 switch (domain) {
3025 case LTTNG_DOMAIN_KERNEL:
3026 /* Can't register a consumer if there is already one */
3027 if (session->kernel_session->consumer_fd != 0) {
3028 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3029 goto error;
3030 }
3031
3032 sock = lttcomm_connect_unix_sock(sock_path);
3033 if (sock < 0) {
3034 ret = LTTCOMM_CONNECT_FAIL;
3035 goto error;
3036 }
3037
3038 session->kernel_session->consumer_fd = sock;
3039 break;
3040 default:
3041 /* TODO: Userspace tracing */
3042 ret = LTTCOMM_NOT_IMPLEMENTED;
3043 goto error;
3044 }
3045
3046 ret = LTTCOMM_OK;
3047
3048error:
3049 return ret;
3050}
3051
3052/*
3053 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3054 */
3055static ssize_t cmd_list_domains(struct ltt_session *session,
3056 struct lttng_domain **domains)
3057{
b551a063 3058 int ret, index = 0;
54d01ffb
DG		 3059 ssize_t nb_dom = 0;
3060
3061 if (session->kernel_session != NULL) {
b551a063 3062 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3063 nb_dom++;
3064 }
3065
b551a063
DG		 3066 if (session->ust_session != NULL) {
3067 DBG3("Listing domains found UST global domain");
3068 nb_dom++;
3069 }
54d01ffb 3070
b551a063 3071 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3072 if (*domains == NULL) {
3073 ret = -LTTCOMM_FATAL;
3074 goto error;
3075 }
3076
b551a063
DG		 3077 if (session->kernel_session != NULL) {
3078 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3079 index++;
3080 }
3081
3082 if (session->ust_session != NULL) {
3083 (*domains)[index].type = LTTNG_DOMAIN_UST;
3084 index++;
3085 }
54d01ffb 3086
54d01ffb
DG		 3087 return nb_dom;
3088
3089error:
3090 return ret;
3091}
3092
3093/*
3094 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3095 */
b551a063 3096static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3097 struct lttng_channel **channels)
3098{
3099 int ret;
3100 ssize_t nb_chan = 0;
3101
b551a063
DG		 3102 switch (domain) {
3103 case LTTNG_DOMAIN_KERNEL:
3104 if (session->kernel_session != NULL) {
3105 nb_chan = session->kernel_session->channel_count;
3106 }
0df502fd 3107 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3108 break;
3109 case LTTNG_DOMAIN_UST:
3110 if (session->ust_session != NULL) {
3111 nb_chan = hashtable_get_count(
3112 session->ust_session->domain_global.channels);
3113 }
0df502fd 3114 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3115 break;
3116 default:
3117 *channels = NULL;
3118 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3119 goto error;
3120 }
3121
b551a063
DG		 3122 if (nb_chan > 0) {
3123 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3124 if (*channels == NULL) {
3125 ret = -LTTCOMM_FATAL;
3126 goto error;
3127 }
54d01ffb 3128
b551a063
DG		 3129 list_lttng_channels(domain, session, *channels);
3130 } else {
3131 *channels = NULL;
3132 }
2bdd86d4 3133
54d01ffb
DG		 3134 return nb_chan;
3135
3136error:
3137 return ret;
3138}
3139
3140/*
3141 * Command LTTNG_LIST_EVENTS processed by the client thread.
3142 */
b551a063 3143static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3144 char *channel_name, struct lttng_event **events)
3145{
b551a063 3146 int ret = 0;
54d01ffb 3147 ssize_t nb_event = 0;
54d01ffb 3148
b551a063
DG		 3149 switch (domain) {
3150 case LTTNG_DOMAIN_KERNEL:
3151 if (session->kernel_session != NULL) {
3152 nb_event = list_lttng_kernel_events(channel_name,
3153 session->kernel_session, events);
54d01ffb 3154 }
b551a063
DG		 3155 break;
3156 case LTTNG_DOMAIN_UST:
3157 {
3158 if (session->ust_session != NULL) {
3159 nb_event = list_lttng_ust_global_events(channel_name,
3160 &session->ust_session->domain_global, events);
3161 }
3162 break;
54d01ffb 3163 }
b551a063
DG		 3164 default:
3165 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3166 goto error;
3167 }
3168
b551a063 3169 ret = nb_event;
54d01ffb
DG		 3170
3171error:
3172 return ret;
3173}
3174
3175/*
3176 * Process the command requested by the lttng client within the command
3177 * context structure. This function make sure that the return structure (llm)
3178 * is set and ready for transmission before returning.
3179 *
3180 * Return any error encountered or 0 for success.
3181 */
3182static int process_client_msg(struct command_ctx *cmd_ctx)
3183{
3184 int ret = LTTCOMM_OK;
44d3bd01 3185 int need_tracing_session = 1;
54d01ffb
DG		 3186
3187 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3188
3189 /*
3190 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3191 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3192 * command.
3193 */
3194 switch(cmd_ctx->lsm->cmd_type) {
3195 case LTTNG_LIST_SESSIONS:
3196 case LTTNG_LIST_TRACEPOINTS:
3197 case LTTNG_LIST_DOMAINS:
3198 case LTTNG_LIST_CHANNELS:
3199 case LTTNG_LIST_EVENTS:
3200 break;
3201 default:
3202 /* Setup lttng message with no payload */
3203 ret = setup_lttng_msg(cmd_ctx, 0);
3204 if (ret < 0) {
3205 /* This label does not try to unlock the session */
3206 goto init_setup_error;
3207 }
3208 }
3209
3210 /* Commands that DO NOT need a session. */
3211 switch (cmd_ctx->lsm->cmd_type) {
3212 case LTTNG_CALIBRATE:
3213 case LTTNG_CREATE_SESSION:
3214 case LTTNG_LIST_SESSIONS:
3215 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3216 need_tracing_session = 0;
54d01ffb
DG		 3217 break;
3218 default:
3219 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3220 session_lock_list();
54d01ffb 3221 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3222 session_unlock_list();
54d01ffb
DG		 3223 if (cmd_ctx->session == NULL) {
3224 if (cmd_ctx->lsm->session.name != NULL) {
3225 ret = LTTCOMM_SESS_NOT_FOUND;
3226 } else {
3227 /* If no session name specified */
3228 ret = LTTCOMM_SELECT_SESS;
3229 }
3230 goto error;
3231 } else {
3232 /* Acquire lock for the session */
3233 session_lock(cmd_ctx->session);
3234 }
3235 break;
3236 }
b389abbe 3237
54d01ffb
DG		 3238 /*
3239 * Check domain type for specific "pre-action".
3240 */
3241 switch (cmd_ctx->lsm->domain.type) {
3242 case LTTNG_DOMAIN_KERNEL:
3243 /* Kernel tracer check */
3244 if (kernel_tracer_fd == 0) {
3245 /* Basically, load kernel tracer modules */
3246 init_kernel_tracer();
3247 if (kernel_tracer_fd == 0) {
3248 ret = LTTCOMM_KERN_NA;
3249 goto error;
3250 }
3251 }
5eb91c98 3252
54d01ffb 3253 /* Need a session for kernel command */
44d3bd01 3254 if (need_tracing_session) {
54d01ffb
DG		 3255 if (cmd_ctx->session->kernel_session == NULL) {
3256 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3257 if (ret < 0) {
54d01ffb 3258 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3259 goto error;
3260 }
b389abbe 3261 }
7d29a247 3262
54d01ffb 3263 /* Start the kernel consumer daemon */
3bd1e081
MD		 3264 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3265 if (kconsumer_data.pid == 0 &&
54d01ffb 3266 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3267 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3268 ret = start_consumerd(&kconsumer_data);
7d29a247 3269 if (ret < 0) {
54d01ffb
DG		 3270 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3271 goto error;
950131af 3272 }
3ff2ecac
MD		 3273 } else {
3274 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3275 }
0d0c377a 3276 }
54d01ffb 3277 break;
2bdd86d4 3278 case LTTNG_DOMAIN_UST:
44d3bd01 3279 {
44d3bd01 3280 if (need_tracing_session) {
f6a9efaa 3281 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG		 3282 ret = create_ust_session(cmd_ctx->session,
3283 &cmd_ctx->lsm->domain);
3284 if (ret != LTTCOMM_OK) {
3285 goto error;
3286 }
3287 }
7753dea8
MD		 3288 /* Start the UST consumer daemons */
3289 /* 64-bit */
3290 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3291 if (consumerd64_bin[0] != '\0' &&
7753dea8 3292 ustconsumer64_data.pid == 0 &&
2bdd86d4 3293 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3294 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3295 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3296 if (ret < 0) {
7753dea8
MD		 3297 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3298 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3299 goto error;
3300 }
48842b30 3301
7753dea8 3302 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3303 } else {
7753dea8
MD		 3304 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3305 }
3306 /* 32-bit */
fc7a59ce 3307 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3308 ustconsumer32_data.pid == 0 &&
3309 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3310 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3311 ret = start_consumerd(&ustconsumer32_data);
3312 if (ret < 0) {
3313 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3314 ust_consumerd32_fd = -EINVAL;
3315 goto error;
3316 }
3317 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3318 } else {
3319 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3320 }
44d3bd01
DG		 3321 }
3322 break;
48842b30 3323 }
54d01ffb 3324 default:
54d01ffb
DG		 3325 break;
3326 }
33a2b854 3327
54d01ffb
DG		 3328 /* Process by command type */
3329 switch (cmd_ctx->lsm->cmd_type) {
3330 case LTTNG_ADD_CONTEXT:
3331 {
3332 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3333 cmd_ctx->lsm->u.context.channel_name,
3334 cmd_ctx->lsm->u.context.event_name,
3335 &cmd_ctx->lsm->u.context.ctx);
3336 break;
3337 }
3338 case LTTNG_DISABLE_CHANNEL:
3339 {
3340 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3341 cmd_ctx->lsm->u.disable.channel_name);
3342 break;
3343 }
3344 case LTTNG_DISABLE_EVENT:
3345 {
3346 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3347 cmd_ctx->lsm->u.disable.channel_name,
3348 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3349 ret = LTTCOMM_OK;
3350 break;
3351 }
54d01ffb
DG		 3352 case LTTNG_DISABLE_ALL_EVENT:
3353 {
2bdd86d4 3354 DBG("Disabling all events");
54d01ffb
DG		 3355
3356 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3357 cmd_ctx->lsm->u.disable.channel_name);
3358 break;
3359 }
3360 case LTTNG_ENABLE_CHANNEL:
3361 {
aea829b3 3362 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3363 &cmd_ctx->lsm->u.channel.chan);
3364 break;
3365 }
3366 case LTTNG_ENABLE_EVENT:
3367 {
3368 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3369 cmd_ctx->lsm->u.enable.channel_name,
3370 &cmd_ctx->lsm->u.enable.event);
3371 break;
3372 }
3373 case LTTNG_ENABLE_ALL_EVENT:
3374 {
2bdd86d4 3375 DBG("Enabling all events");
54d01ffb
DG		 3376
3377 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3378 cmd_ctx->lsm->u.enable.channel_name,
3379 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3380 break;
3381 }
052da939 3382 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3383 {
9f19cc17 3384 struct lttng_event *events;
54d01ffb 3385 ssize_t nb_events;
052da939 3386
54d01ffb
DG		 3387 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3388 if (nb_events < 0) {
3389 ret = -nb_events;
3390 goto error;
2ef84c95
DG		 3391 }
3392
3393 /*
3394 * Setup lttng message with payload size set to the event list size in
3395 * bytes and then copy list into the llm payload.
3396 */
052da939 3397 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3398 if (ret < 0) {
052da939 3399 free(events);
2ef84c95
DG		 3400 goto setup_error;
3401 }
3402
3403 /* Copy event list into message payload */
9f19cc17 3404 memcpy(cmd_ctx->llm->payload, events,
052da939 3405 sizeof(struct lttng_event) * nb_events);
2ef84c95 3406
9f19cc17 3407 free(events);
2ef84c95
DG		 3408
3409 ret = LTTCOMM_OK;
3410 break;
3411 }
f3ed775e 3412 case LTTNG_START_TRACE:
8c0faa1d 3413 {
54d01ffb 3414 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3415 break;
3416 }
f3ed775e 3417 case LTTNG_STOP_TRACE:
8c0faa1d 3418 {
54d01ffb 3419 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3420 break;
3421 }
5e16da05
MD		 3422 case LTTNG_CREATE_SESSION:
3423 {
54d01ffb
DG		 3424 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3425 cmd_ctx->lsm->session.path);
5e16da05
MD		 3426 break;
3427 }
3428 case LTTNG_DESTROY_SESSION:
3429 {
54d01ffb
DG		 3430 ret = cmd_destroy_session(cmd_ctx->session,
3431 cmd_ctx->lsm->session.name);
5461b305 3432 break;
5e16da05 3433 }
9f19cc17 3434 case LTTNG_LIST_DOMAINS:
5e16da05 3435 {
54d01ffb
DG		 3436 ssize_t nb_dom;
3437 struct lttng_domain *domains;
5461b305 3438
54d01ffb
DG		 3439 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3440 if (nb_dom < 0) {
3441 ret = -nb_dom;
3442 goto error;
ce3d728c 3443 }
520ff687 3444
54d01ffb 3445 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3446 if (ret < 0) {
3447 goto setup_error;
520ff687 3448 }
57167058 3449
54d01ffb
DG		 3450 /* Copy event list into message payload */
3451 memcpy(cmd_ctx->llm->payload, domains,
3452 nb_dom * sizeof(struct lttng_domain));
3453
3454 free(domains);
5e16da05 3455
5461b305 3456 ret = LTTCOMM_OK;
5e16da05
MD		 3457 break;
3458 }
9f19cc17 3459 case LTTNG_LIST_CHANNELS:
5e16da05 3460 {
54d01ffb
DG		 3461 size_t nb_chan;
3462 struct lttng_channel *channels;
3463
b551a063
DG		 3464 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3465 cmd_ctx->session, &channels);
54d01ffb
DG		 3466 if (nb_chan < 0) {
3467 ret = -nb_chan;
3468 goto error;
5461b305 3469 }
ca95a216 3470
54d01ffb 3471 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3472 if (ret < 0) {
3473 goto setup_error;
3474 }
9f19cc17 3475
54d01ffb
DG		 3476 /* Copy event list into message payload */
3477 memcpy(cmd_ctx->llm->payload, channels,
3478 nb_chan * sizeof(struct lttng_channel));
3479
3480 free(channels);
9f19cc17
DG		 3481
3482 ret = LTTCOMM_OK;
5461b305 3483 break;
5e16da05 3484 }
9f19cc17 3485 case LTTNG_LIST_EVENTS:
5e16da05 3486 {
b551a063 3487 ssize_t nb_event;
684d34d2 3488 struct lttng_event *events = NULL;
9f19cc17 3489
b551a063 3490 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3491 cmd_ctx->lsm->u.list.channel_name, &events);
3492 if (nb_event < 0) {
3493 ret = -nb_event;
3494 goto error;
5461b305 3495 }
ca95a216 3496
54d01ffb 3497 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3498 if (ret < 0) {
3499 goto setup_error;
3500 }
9f19cc17 3501
54d01ffb
DG		 3502 /* Copy event list into message payload */
3503 memcpy(cmd_ctx->llm->payload, events,
3504 nb_event * sizeof(struct lttng_event));
9f19cc17 3505
54d01ffb 3506 free(events);
9f19cc17
DG		 3507
3508 ret = LTTCOMM_OK;
5461b305 3509 break;
5e16da05
MD		 3510 }
3511 case LTTNG_LIST_SESSIONS:
3512 {
54d01ffb 3513 session_lock_list();
5461b305 3514
6c9cc2ab 3515 if (session_list_ptr->count == 0) {
f3ed775e 3516 ret = LTTCOMM_NO_SESSION;
54d01ffb 3517 session_unlock_list();
5461b305 3518 goto error;
57167058 3519 }
5e16da05 3520
6c9cc2ab
DG		 3521 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3522 session_list_ptr->count);
5461b305 3523 if (ret < 0) {
54d01ffb 3524 session_unlock_list();
5461b305 3525 goto setup_error;
e065084a 3526 }
5e16da05 3527
6c9cc2ab
DG		 3528 /* Filled the session array */
3529 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3530
54d01ffb 3531 session_unlock_list();
5e16da05 3532
5461b305 3533 ret = LTTCOMM_OK;
5e16da05
MD		 3534 break;
3535 }
d0254c7c
MD		 3536 case LTTNG_CALIBRATE:
3537 {
54d01ffb
DG		 3538 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3539 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3540 break;
3541 }
d9800920
DG		 3542 case LTTNG_REGISTER_CONSUMER:
3543 {
54d01ffb
DG		 3544 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3545 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3546 break;
3547 }
5e16da05 3548 default:
5e16da05 3549 ret = LTTCOMM_UND;
5461b305 3550 break;
fac6795d
DG		 3551 }
3552
5461b305 3553error:
5461b305
DG		 3554 if (cmd_ctx->llm == NULL) {
3555 DBG("Missing llm structure. Allocating one.");
894be886 3556 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3557 goto setup_error;
3558 }
3559 }
54d01ffb 3560 /* Set return code */
5461b305 3561 cmd_ctx->llm->ret_code = ret;
5461b305 3562setup_error:
b5541356 3563 if (cmd_ctx->session) {
54d01ffb 3564 session_unlock(cmd_ctx->session);
b5541356 3565 }
54d01ffb 3566init_setup_error:
8028d920 3567 return ret;
fac6795d
DG		 3568}
3569
1d4b027a 3570/*
d063d709
DG		 3571 * This thread manage all clients request using the unix client socket for
3572 * communication.
1d4b027a
DG		 3573 */
3574static void *thread_manage_clients(void *data)
3575{
5eb91c98
DG		 3576 int sock = 0, ret, i, pollfd;
3577 uint32_t revents, nb_fd;
273ea72c 3578 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3579 struct lttng_poll_event events;
1d4b027a
DG		 3580
3581 DBG("[thread] Manage client started");
3582
f6a9efaa
DG		 3583 rcu_register_thread();
3584
1d4b027a
DG		 3585 ret = lttcomm_listen_unix_sock(client_sock);
3586 if (ret < 0) {
3587 goto error;
3588 }
3589
5eb91c98
DG		 3590 /*
3591 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3592 * more will be added to this poll set.
3593 */
3594 ret = create_thread_poll_set(&events, 2);
3595 if (ret < 0) {
3596 goto error;
3597 }
273ea72c 3598
5eb91c98
DG		 3599 /* Add the application registration socket */
3600 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3601 if (ret < 0) {
3602 goto error;
3603 }
273ea72c 3604
bbd973c2
DG		 3605 /*
3606 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3607 */
3608 if (opt_sig_parent) {
3609 kill(ppid, SIGCHLD);
3610 }
3611
3612 while (1) {
1d4b027a 3613 DBG("Accepting client command ...");
273ea72c 3614
5eb91c98
DG		 3615 nb_fd = LTTNG_POLL_GETNB(&events);
3616
273ea72c 3617 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3618 ret = lttng_poll_wait(&events, -1);
273ea72c 3619 if (ret < 0) {
273ea72c
DG		 3620 goto error;
3621 }
3622
5eb91c98
DG		 3623 for (i = 0; i < nb_fd; i++) {
3624 /* Fetch once the poll data */
3625 revents = LTTNG_POLL_GETEV(&events, i);
3626 pollfd = LTTNG_POLL_GETFD(&events, i);
3627
3628 /* Thread quit pipe has been closed. Killing thread. */
3629 ret = check_thread_quit_pipe(pollfd, revents);
3630 if (ret) {
3631 goto error;
3632 }
3633
3634 /* Event on the registration socket */
3635 if (pollfd == client_sock) {
3636 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3637 ERR("Client socket poll error");
3638 goto error;
3639 }
3640 }
3641 }
3642
3643 DBG("Wait for client response");
3644
3645 sock = lttcomm_accept_unix_sock(client_sock);
3646 if (sock < 0) {
273ea72c 3647 goto error;
273ea72c
DG		 3648 }
3649
5eb91c98 3650 /* Allocate context command to process the client request */
ba7f0ae5 3651 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3652 if (cmd_ctx == NULL) {
ba7f0ae5 3653 perror("zmalloc cmd_ctx");
1d4b027a 3654 goto error;
5eb91c98 3655 }
1d4b027a 3656
5eb91c98 3657 /* Allocate data buffer for reception */
ba7f0ae5 3658 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3659 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3660 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3661 goto error;
3662 }
1d4b027a 3663
5eb91c98
DG		 3664 cmd_ctx->llm = NULL;
3665 cmd_ctx->session = NULL;
1d4b027a 3666
5eb91c98
DG		 3667 /*
3668 * Data is received from the lttng client. The struct
3669 * lttcomm_session_msg (lsm) contains the command and data request of
3670 * the client.
3671 */
3672 DBG("Receiving data from client ...");
3673 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3674 sizeof(struct lttcomm_session_msg));
3675 if (ret <= 0) {
3676 DBG("Nothing recv() from client... continuing");
3677 close(sock);
3678 free(cmd_ctx);
3679 continue;
3680 }
1d4b027a 3681
5eb91c98
DG		 3682 // TODO: Validate cmd_ctx including sanity check for
3683 // security purpose.
f7776ea7 3684
f6a9efaa 3685 rcu_thread_online();
5eb91c98
DG		 3686 /*
3687 * This function dispatch the work to the kernel or userspace tracer
3688 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3689 * informations for the client. The command context struct contains
3690 * everything this function may needs.
3691 */
3692 ret = process_client_msg(cmd_ctx);
f6a9efaa 3693 rcu_thread_offline();
5eb91c98 3694 if (ret < 0) {
bbd973c2 3695 /*
5eb91c98 3696 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3697 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3698 * (ENOMEM). Error detected but still accept command.
bbd973c2 3699 */
bbd973c2 3700 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3701 continue;
3702 }
d6e4fca4 3703
54d01ffb
DG		 3704 DBG("Sending response (size: %d, retcode: %s)",
3705 cmd_ctx->lttng_msg_size,
9a745bc7 3706 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3707 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3708 if (ret < 0) {
3709 ERR("Failed to send data back to client");
bbd973c2 3710 }
1d4b027a 3711
5eb91c98
DG		 3712 clean_command_ctx(&cmd_ctx);
3713
3714 /* End of transmission */
273ea72c
DG		 3715 close(sock);
3716 }
3717
5eb91c98
DG		 3718error:
3719 DBG("Client thread dying");
273ea72c 3720 unlink(client_unix_sock_path);
5eb91c98
DG		 3721 close(client_sock);
3722 close(sock);
273ea72c 3723
5eb91c98 3724 lttng_poll_clean(&events);
a2fb29a5 3725 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3726
3727 rcu_unregister_thread();
1d4b027a
DG		 3728 return NULL;
3729}
3730
3731
fac6795d
DG		 3732/*
3733 * usage function on stderr
3734 */
3735static void usage(void)
3736{
b716ce68 3737 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3738 fprintf(stderr, " -h, --help Display this usage.\n");
3739 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3740 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3741 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3742 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3743 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3744 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3745 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3746 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3747 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3748 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3749 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3750 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3751 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3752 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3753 fprintf(stderr, " -V, --version Show version number.\n");
3754 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3755 fprintf(stderr, " -q, --quiet No output at all.\n");
3756 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3757 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
fac6795d
DG		 3758}
3759
3760/*
3761 * daemon argument parsing
3762 */
3763static int parse_args(int argc, char **argv)
3764{
3765 int c;
3766
3767 static struct option long_options[] = {
3768 { "client-sock", 1, 0, 'c' },
3769 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3770 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3771 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3772 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3773 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3774 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3775 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3776 { "consumerd32-path", 1, 0, 'u' },
3777 { "consumerd32-libdir", 1, 0, 'U' },
3778 { "consumerd64-path", 1, 0, 't' },
3779 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3780 { "daemonize", 0, 0, 'd' },
5b8719f5 3781 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3782 { "help", 0, 0, 'h' },
3783 { "group", 1, 0, 'g' },
3784 { "version", 0, 0, 'V' },
75462a81 3785 { "quiet", 0, 0, 'q' },
3f9947db 3786 { "verbose", 0, 0, 'v' },
3bd1e081 3787 { "verbose-consumer", 0, 0, 'Z' },
fac6795d
DG		 3788 { NULL, 0, 0, 0 }
3789 };
3790
3791 while (1) {
3792 int option_index = 0;
7753dea8 3793 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3794 long_options, &option_index);
fac6795d
DG		 3795 if (c == -1) {
3796 break;
3797 }
3798
3799 switch (c) {
3800 case 0:
3801 fprintf(stderr, "option %s", long_options[option_index].name);
3802 if (optarg) {
3803 fprintf(stderr, " with arg %s\n", optarg);
3804 }
3805 break;
b716ce68 3806 case 'c':
fac6795d
DG		 3807 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3808 break;
3809 case 'a':
3810 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3811 break;
3812 case 'd':
3813 opt_daemon = 1;
3814 break;
3815 case 'g':
fb09408a 3816 opt_tracing_group = optarg;
fac6795d
DG		 3817 break;
3818 case 'h':
3819 usage();
3820 exit(EXIT_FAILURE);
3821 case 'V':
3822 fprintf(stdout, "%s\n", VERSION);
3823 exit(EXIT_SUCCESS);
5b8719f5
DG		 3824 case 'S':
3825 opt_sig_parent = 1;
3826 break;
d6f42150 3827 case 'E':
3bd1e081 3828 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3829 break;
3830 case 'C':
3bd1e081
MD		 3831 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3832 break;
3833 case 'F':
7753dea8 3834 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3835 break;
3836 case 'D':
7753dea8
MD		 3837 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3838 break;
3839 case 'H':
3840 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3841 break;
3842 case 'G':
3843 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3844 break;
75462a81
DG		 3845 case 'q':
3846 opt_quiet = 1;
3847 break;
3f9947db 3848 case 'v':
53086306
DG		 3849 /* Verbose level can increase using multiple -v */
3850 opt_verbose += 1;
3f9947db 3851 break;
31f73cc9 3852 case 'Z':
3bd1e081 3853 opt_verbose_consumer += 1;
31f73cc9 3854 break;
fb09408a 3855 case 'u':
fc7a59ce 3856 consumerd32_bin= optarg;
ebaeda94
MD		 3857 break;
3858 case 'U':
3859 consumerd32_libdir = optarg;
7753dea8
MD		 3860 break;
3861 case 't':
fc7a59ce 3862 consumerd64_bin = optarg;
ebaeda94
MD		 3863 break;
3864 case 'T':
3865 consumerd64_libdir = optarg;
fb09408a 3866 break;
fac6795d
DG		 3867 default:
3868 /* Unknown option or other error.
3869 * Error is printed by getopt, just return */
3870 return -1;
3871 }
3872 }
3873
3874 return 0;
3875}
3876
3877/*
d063d709 3878 * Creates the two needed socket by the daemon.
d6f42150
DG		 3879 * apps_sock - The communication socket for all UST apps.
3880 * client_sock - The communication of the cli tool (lttng).
fac6795d 3881 */
cf3af59e 3882static int init_daemon_socket(void)
fac6795d
DG		 3883{
3884 int ret = 0;
3885 mode_t old_umask;
3886
3887 old_umask = umask(0);
3888
3889 /* Create client tool unix socket */
d6f42150
DG		 3890 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3891 if (client_sock < 0) {
3892 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3893 ret = -1;
3894 goto end;
3895 }
3896
3897 /* File permission MUST be 660 */
3898 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3899 if (ret < 0) {
d6f42150 3900 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3901 perror("chmod");
3902 goto end;
3903 }
3904
3905 /* Create the application unix socket */
d6f42150
DG		 3906 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3907 if (apps_sock < 0) {
3908 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3909 ret = -1;
3910 goto end;
3911 }
3912
d6f42150 3913 /* File permission MUST be 666 */
54d01ffb
DG		 3914 ret = chmod(apps_unix_sock_path,
3915 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3916 if (ret < 0) {
d6f42150 3917 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3918 perror("chmod");
3919 goto end;
3920 }
3921
3922end:
3923 umask(old_umask);
3924 return ret;
3925}
3926
3927/*
54d01ffb
DG		 3928 * Check if the global socket is available, and if a daemon is answering at the
3929 * other side. If yes, error is returned.
fac6795d 3930 */
cf3af59e 3931static int check_existing_daemon(void)
fac6795d 3932{
7d8234d9 3933 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3934 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3935 return 0;
099e26bd 3936 }
54d01ffb 3937
7d8234d9 3938 /* Is there anybody out there ? */
099e26bd 3939 if (lttng_session_daemon_alive()) {
7d8234d9 3940 return -EEXIST;
099e26bd 3941 } else {
7d8234d9 3942 return 0;
099e26bd 3943 }
fac6795d
DG		 3944}
3945
fac6795d 3946/*
d063d709 3947 * Set the tracing group gid onto the client socket.
5e16da05 3948 *
d063d709
DG		 3949 * Race window between mkdir and chown is OK because we are going from more
3950 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3951 */
d6f42150 3952static int set_permissions(void)
fac6795d
DG		 3953{
3954 int ret;
996b65c8 3955 gid_t gid;
fac6795d 3956
996b65c8
MD		 3957 gid = allowed_group();
3958 if (gid < 0) {
a463f419
DG		 3959 if (is_root) {
3960 WARN("No tracing group detected");
3961 ret = 0;
3962 } else {
3963 ERR("Missing tracing group. Aborting execution.");
3964 ret = -1;
3965 }
fac6795d
DG		 3966 goto end;
3967 }
3968
d6f42150 3969 /* Set lttng run dir */
996b65c8 3970 ret = chown(LTTNG_RUNDIR, 0, gid);
d6f42150
DG		 3971 if (ret < 0) {
3972 ERR("Unable to set group on " LTTNG_RUNDIR);
3973 perror("chown");
3974 }
3975
3976 /* lttng client socket path */
996b65c8 3977 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3978 if (ret < 0) {
d6f42150
DG		 3979 ERR("Unable to set group on %s", client_unix_sock_path);
3980 perror("chown");
3981 }
3982
3bd1e081
MD		 3983 /* kconsumer error socket path */
3984 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 3985 if (ret < 0) {
3bd1e081
MD		 3986 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3987 perror("chown");
3988 }
3989
7753dea8
MD		 3990 /* 64-bit ustconsumer error socket path */
3991 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3992 if (ret < 0) {
3993 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3994 perror("chown");
3995 }
3996
3997 /* 32-bit ustconsumer compat32 error socket path */
3998 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 3999 if (ret < 0) {
7753dea8 4000 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 4001 perror("chown");
4002 }
4003
d6f42150 4004 DBG("All permissions are set");
e07ae692 4005
fac6795d
DG		 4006end:
4007 return ret;
4008}
4009
7a485870 4010/*
d063d709 4011 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 4012 */
4013static int create_kernel_poll_pipe(void)
4014{
4015 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4016}
4017
099e26bd
DG		 4018/*
4019 * Create the application command pipe to wake thread_manage_apps.
4020 */
4021static int create_apps_cmd_pipe(void)
4022{
4023 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4024}
4025
d6f42150 4026/*
d063d709 4027 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150
DG		 4028 */
4029static int create_lttng_rundir(void)
4030{
4031 int ret;
4032
4033 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
4034 if (ret < 0) {
b1f11e69
DG		 4035 if (errno != EEXIST) {
4036 ERR("Unable to create " LTTNG_RUNDIR);
4037 goto error;
4038 } else {
4039 ret = 0;
4040 }
d6f42150
DG		 4041 }
4042
4043error:
4044 return ret;
4045}
4046
4047/*
d063d709
DG		 4048 * Setup sockets and directory needed by the kconsumerd communication with the
4049 * session daemon.
d6f42150 4050 */
3bd1e081 4051static int set_consumer_sockets(struct consumer_data *consumer_data)
d6f42150
DG		 4052{
4053 int ret;
7753dea8 4054 const char *path;
d6f42150 4055
7753dea8
MD		 4056 switch (consumer_data->type) {
4057 case LTTNG_CONSUMER_KERNEL:
4058 path = KCONSUMERD_PATH;
4059 break;
4060 case LTTNG_CONSUMER64_UST:
4061 path = USTCONSUMERD64_PATH;
4062 break;
4063 case LTTNG_CONSUMER32_UST:
4064 path = USTCONSUMERD32_PATH;
4065 break;
4066 default:
4067 ERR("Consumer type unknown");
4068 ret = -EINVAL;
4069 goto error;
d6f42150
DG		 4070 }
4071
3bd1e081 4072 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4073 if (ret < 0) {
6beb2242 4074 if (errno != EEXIST) {
3bd1e081 4075 ERR("Failed to create %s", path);
6beb2242
DG		 4076 goto error;
4077 }
4078 ret = 0;
d6f42150
DG		 4079 }
4080
4081 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4082 consumer_data->err_sock =
4083 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4084 if (consumer_data->err_sock < 0) {
4085 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4086 ret = -1;
4087 goto error;
4088 }
4089
4090 /* File permission MUST be 660 */
3bd1e081 4091 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4092 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4093 if (ret < 0) {
3bd1e081 4094 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4095 perror("chmod");
4096 goto error;
4097 }
4098
4099error:
4100 return ret;
4101}
4102
fac6795d 4103/*
d063d709 4104 * Signal handler for the daemon
cf3af59e 4105 *
54d01ffb
DG		 4106 * Simply stop all worker threads, leaving main() return gracefully after
4107 * joining all threads and calling cleanup().
fac6795d
DG		 4108 */
4109static void sighandler(int sig)
4110{
4111 switch (sig) {
cf3af59e
MD		 4112 case SIGPIPE:
4113 DBG("SIGPIPE catched");
4114 return;
4115 case SIGINT:
4116 DBG("SIGINT catched");
4117 stop_threads();
4118 break;
4119 case SIGTERM:
4120 DBG("SIGTERM catched");
4121 stop_threads();
4122 break;
4123 default:
4124 break;
fac6795d 4125 }
fac6795d
DG		 4126}
4127
4128/*
d063d709 4129 * Setup signal handler for :
1d4b027a 4130 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4131 */
1d4b027a 4132static int set_signal_handler(void)
fac6795d 4133{
1d4b027a
DG		 4134 int ret = 0;
4135 struct sigaction sa;
4136 sigset_t sigset;
fac6795d 4137
1d4b027a
DG		 4138 if ((ret = sigemptyset(&sigset)) < 0) {
4139 perror("sigemptyset");
4140 return ret;
4141 }
d6f42150 4142
1d4b027a
DG		 4143 sa.sa_handler = sighandler;
4144 sa.sa_mask = sigset;
4145 sa.sa_flags = 0;
4146 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4147 perror("sigaction");
4148 return ret;
d6f42150
DG		 4149 }
4150
1d4b027a
DG		 4151 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4152 perror("sigaction");
4153 return ret;
d6f42150 4154 }
aaf26714 4155
1d4b027a
DG		 4156 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4157 perror("sigaction");
4158 return ret;
8c0faa1d
DG		 4159 }
4160
1d4b027a
DG		 4161 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4162
4163 return ret;
fac6795d
DG		 4164}
4165
f3ed775e 4166/*
d063d709
DG		 4167 * Set open files limit to unlimited. This daemon can open a large number of
4168 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4169 */
4170static void set_ulimit(void)
4171{
4172 int ret;
4173 struct rlimit lim;
4174
a88df331 4175 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4176 lim.rlim_cur = 65535;
4177 lim.rlim_max = 65535;
4178
4179 ret = setrlimit(RLIMIT_NOFILE, &lim);
4180 if (ret < 0) {
4181 perror("failed to set open files limit");
4182 }
4183}
4184
fac6795d
DG		 4185/*
4186 * main
4187 */
4188int main(int argc, char **argv)
4189{
fac6795d
DG		 4190 int ret = 0;
4191 void *status;
b082db07 4192 const char *home_path;
fac6795d 4193
f6a9efaa
DG		 4194 rcu_register_thread();
4195
273ea72c 4196 /* Create thread quit pipe */
cf3af59e
MD		 4197 if ((ret = init_thread_quit_pipe()) < 0) {
4198 goto error;
273ea72c
DG		 4199 }
4200
7753dea8 4201 setup_consumerd_path();
fb09408a 4202
fac6795d
DG		 4203 /* Parse arguments */
4204 progname = argv[0];
4205 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4206 goto error;
fac6795d
DG		 4207 }
4208
4209 /* Daemonize */
4210 if (opt_daemon) {
53094c05
DG		 4211 ret = daemon(0, 0);
4212 if (ret < 0) {
4213 perror("daemon");
cf3af59e 4214 goto error;
53094c05 4215 }
fac6795d
DG		 4216 }
4217
4218 /* Check if daemon is UID = 0 */
4219 is_root = !getuid();
4220
fac6795d 4221 if (is_root) {
d6f42150
DG		 4222 ret = create_lttng_rundir();
4223 if (ret < 0) {
cf3af59e 4224 goto error;
d6f42150
DG		 4225 }
4226
fac6795d 4227 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4228 snprintf(apps_unix_sock_path, PATH_MAX,
4229 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4230 }
4231
4232 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4233 snprintf(client_unix_sock_path, PATH_MAX,
4234 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4235 }
0fdd1e2c
DG		 4236
4237 /* Set global SHM for ust */
4238 if (strlen(wait_shm_path) == 0) {
4239 snprintf(wait_shm_path, PATH_MAX,
4240 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4241 }
fac6795d 4242 } else {
b082db07
DG		 4243 home_path = get_home_dir();
4244 if (home_path == NULL) {
273ea72c
DG		 4245 /* TODO: Add --socket PATH option */
4246 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4247 ret = -EPERM;
4248 goto error;
b082db07
DG		 4249 }
4250
fac6795d 4251 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4252 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4253 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4254 }
4255
4256 /* Set the cli tool unix socket path */
4257 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4258 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4259 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4260 }
0fdd1e2c
DG		 4261
4262 /* Set global SHM for ust */
4263 if (strlen(wait_shm_path) == 0) {
4264 snprintf(wait_shm_path, PATH_MAX,
4265 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4266 }
fac6795d
DG		 4267 }
4268
847177cd
DG		 4269 DBG("Client socket path %s", client_unix_sock_path);
4270 DBG("Application socket path %s", apps_unix_sock_path);
4271
273ea72c 4272 /*
7d8234d9 4273 * See if daemon already exist.
fac6795d 4274 */
7d8234d9 4275 if ((ret = check_existing_daemon()) < 0) {
75462a81 4276 ERR("Already running daemon.\n");
273ea72c 4277 /*
cf3af59e
MD		 4278 * We do not goto exit because we must not cleanup()
4279 * because a daemon is already running.
ab118b20 4280 */
cf3af59e 4281 goto error;
a88df331
DG		 4282 }
4283
54d01ffb 4284 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4285
4286 /*
4287 * These actions must be executed as root. We do that *after* setting up
4288 * the sockets path because we MUST make the check for another daemon using
4289 * those paths *before* trying to set the kernel consumer sockets and init
4290 * kernel tracer.
4291 */
4292 if (is_root) {
3bd1e081
MD		 4293 ret = set_consumer_sockets(&kconsumer_data);
4294 if (ret < 0) {
4295 goto exit;
4296 }
48842b30 4297
7753dea8 4298 ret = set_consumer_sockets(&ustconsumer64_data);
a88df331 4299 if (ret < 0) {
cf3af59e 4300 goto exit;
a88df331 4301 }
7753dea8
MD		 4302
4303 ret = set_consumer_sockets(&ustconsumer32_data);
4304 if (ret < 0) {
4305 goto exit;
4306 }
4307
a88df331
DG		 4308 /* Setup kernel tracer */
4309 init_kernel_tracer();
4310
4311 /* Set ulimit for open files */
4312 set_ulimit();
fac6795d
DG		 4313 }
4314
cf3af59e
MD		 4315 if ((ret = set_signal_handler()) < 0) {
4316 goto exit;
fac6795d
DG		 4317 }
4318
d6f42150 4319 /* Setup the needed unix socket */
cf3af59e
MD		 4320 if ((ret = init_daemon_socket()) < 0) {
4321 goto exit;
fac6795d
DG		 4322 }
4323
4324 /* Set credentials to socket */
cf3af59e
MD		 4325 if (is_root && ((ret = set_permissions()) < 0)) {
4326 goto exit;
fac6795d
DG		 4327 }
4328
5b8719f5
DG		 4329 /* Get parent pid if -S, --sig-parent is specified. */
4330 if (opt_sig_parent) {
4331 ppid = getppid();
4332 }
4333
7a485870 4334 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4335 if ((ret = create_kernel_poll_pipe()) < 0) {
4336 goto exit;
7a485870
DG		 4337 }
4338
099e26bd
DG		 4339 /* Setup the thread apps communication pipe. */
4340 if ((ret = create_apps_cmd_pipe()) < 0) {
4341 goto exit;
4342 }
4343
4344 /* Init UST command queue. */
4345 cds_wfq_init(&ust_cmd_queue.queue);
4346
f6a9efaa
DG		 4347 /* Init UST app hash table */
4348 ust_app_ht_alloc();
4349
273ea72c 4350 /*
54d01ffb
DG		 4351 * Get session list pointer. This pointer MUST NOT be free(). This list is
4352 * statically declared in session.c
273ea72c 4353 */
54d01ffb 4354 session_list_ptr = session_get_list();
b5541356 4355
5eb91c98
DG		 4356 /* Set up max poll set size */
4357 lttng_poll_set_max_size();
4358
cf3af59e 4359 /* Create thread to manage the client socket */
099e26bd
DG		 4360 ret = pthread_create(&client_thread, NULL,
4361 thread_manage_clients, (void *) NULL);
cf3af59e 4362 if (ret != 0) {
099e26bd 4363 perror("pthread_create clients");
cf3af59e
MD		 4364 goto exit_client;
4365 }
fac6795d 4366
099e26bd
DG		 4367 /* Create thread to dispatch registration */
4368 ret = pthread_create(&dispatch_thread, NULL,
4369 thread_dispatch_ust_registration, (void *) NULL);
4370 if (ret != 0) {
4371 perror("pthread_create dispatch");
4372 goto exit_dispatch;
4373 }
4374
4375 /* Create thread to manage application registration. */
4376 ret = pthread_create(&reg_apps_thread, NULL,
4377 thread_registration_apps, (void *) NULL);
4378 if (ret != 0) {
4379 perror("pthread_create registration");
4380 goto exit_reg_apps;
4381 }
4382
cf3af59e 4383 /* Create thread to manage application socket */
54d01ffb
DG		 4384 ret = pthread_create(&apps_thread, NULL,
4385 thread_manage_apps, (void *) NULL);
cf3af59e 4386 if (ret != 0) {
099e26bd 4387 perror("pthread_create apps");
cf3af59e
MD		 4388 goto exit_apps;
4389 }
fac6795d 4390
cf3af59e 4391 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4392 ret = pthread_create(&kernel_thread, NULL,
4393 thread_manage_kernel, (void *) NULL);
cf3af59e 4394 if (ret != 0) {
099e26bd 4395 perror("pthread_create kernel");
cf3af59e
MD		 4396 goto exit_kernel;
4397 }
7a485870 4398
cf3af59e
MD		 4399 ret = pthread_join(kernel_thread, &status);
4400 if (ret != 0) {
4401 perror("pthread_join");
4402 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4403 }
4404
cf3af59e
MD		 4405exit_kernel:
4406 ret = pthread_join(apps_thread, &status);
4407 if (ret != 0) {
4408 perror("pthread_join");
4409 goto error; /* join error, exit without cleanup */
4410 }
fac6795d 4411
cf3af59e 4412exit_apps:
099e26bd
DG		 4413 ret = pthread_join(reg_apps_thread, &status);
4414 if (ret != 0) {
4415 perror("pthread_join");
4416 goto error; /* join error, exit without cleanup */
4417 }
4418
4419exit_reg_apps:
4420 ret = pthread_join(dispatch_thread, &status);
4421 if (ret != 0) {
4422 perror("pthread_join");
4423 goto error; /* join error, exit without cleanup */
4424 }
4425
4426exit_dispatch:
cf3af59e
MD		 4427 ret = pthread_join(client_thread, &status);
4428 if (ret != 0) {
4429 perror("pthread_join");
4430 goto error; /* join error, exit without cleanup */
4431 }
4432
3bd1e081 4433 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4434 if (ret != 0) {
3bd1e081 4435 perror("join_consumer");
cf3af59e
MD		 4436 goto error; /* join error, exit without cleanup */
4437 }
a88df331 4438
cf3af59e 4439exit_client:
a88df331 4440exit:
cf3af59e
MD		 4441 /*
4442 * cleanup() is called when no other thread is running.
4443 */
f6a9efaa 4444 rcu_thread_online();
cf3af59e 4445 cleanup();
f6a9efaa
DG		 4446 rcu_thread_offline();
4447 rcu_unregister_thread();
cf3af59e
MD		 4448 if (!ret)
4449 exit(EXIT_SUCCESS);
4450error:
5e16da05 4451 exit(EXIT_FAILURE);
fac6795d 4452}
LTTng 2.0 tools and control repository
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