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Merge branch 'master' into benchmark
[lttng-tools.git] / src / bin / 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
990570ed 41#include <common/common.h>
0ba98ebc 42#include <common/compat/poll.h>
db758600
DG		 43#include <common/defaults.h>
44#include <common/kernel-consumer/kernel-consumer.h>
45#include <common/ust-consumer/ust-consumer.h>
fac6795d 46
10a8a223 47#include "lttng-sessiond.h"
54d01ffb 48#include "channel.h"
b579acd9 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
4771f025 52#include "kernel.h"
096102bd 53#include "modprobe.h"
0fdd1e2c 54#include "shm.h"
1e307fab 55#include "ust-ctl.h"
8e68d1c8 56#include "utils.h"
fac6795d 57
ebaeda94
MD		 58#define CONSUMERD_FILE "lttng-consumerd"
59
3bd1e081
MD		 60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
fac6795d 77
b25a8868
DG		 78#include "benchmark.h"
79
75462a81 80/* Const values */
686204ab 81const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 82const char default_tracing_group[] = 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 94static int opt_daemon;
4fba7219 95static int opt_no_kernel;
fac6795d 96static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 97static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 98static char *rundir;
3bd1e081
MD		 99
100/* Consumer daemon specific control data */
101static struct consumer_data kconsumer_data = {
102 .type = LTTNG_CONSUMER_KERNEL,
60922cb0
DG		 103 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 105};
7753dea8
MD		 106static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
60922cb0
DG		 108 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
3bd1e081 110};
7753dea8
MD		 111static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
60922cb0
DG		 113 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 115};
116
099e26bd 117static int dispatch_thread_exit;
fac6795d 118
54d01ffb
DG		 119/* Global application Unix socket path */
120static char apps_unix_sock_path[PATH_MAX];
121/* Global client Unix socket path */
122static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 123/* global wait shm path for UST */
124static char wait_shm_path[PATH_MAX];
fac6795d 125
1d4b027a 126/* Sockets and FDs */
d6f42150
DG		 127static int client_sock;
128static int apps_sock;
20fe2104 129static int kernel_tracer_fd;
7a485870 130static int kernel_poll_pipe[2];
1d4b027a 131
273ea72c
DG		 132/*
133 * Quit pipe for all threads. This permits a single cancellation point
134 * for all threads when receiving an event on the pipe.
135 */
136static int thread_quit_pipe[2];
137
099e26bd
DG		 138/*
139 * This pipe is used to inform the thread managing application communication
140 * that a command is queued and ready to be processed.
141 */
142static int apps_cmd_pipe[2];
143
1d4b027a 144/* Pthread, Mutexes and Semaphores */
1d4b027a 145static pthread_t apps_thread;
099e26bd 146static pthread_t reg_apps_thread;
1d4b027a 147static pthread_t client_thread;
7a485870 148static pthread_t kernel_thread;
099e26bd 149static pthread_t dispatch_thread;
5eb91c98 150
fac6795d 151
099e26bd
DG		 152/*
153 * UST registration command queue. This queue is tied with a futex and uses a N
154 * wakers / 1 waiter implemented and detailed in futex.c/.h
155 *
156 * The thread_manage_apps and thread_dispatch_ust_registration interact with
157 * this queue and the wait/wake scheme.
158 */
159static struct ust_cmd_queue ust_cmd_queue;
160
b5541356
DG		 161/*
162 * Pointer initialized before thread creation.
163 *
164 * This points to the tracing session list containing the session count and a
165 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
166 * MUST NOT be taken if you call a public function in session.c.
04ea676f 167 *
d063d709 168 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 169 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 170 */
171static struct ltt_session_list *session_list_ptr;
172
7753dea8
MD		 173int ust_consumerd64_fd = -1;
174int ust_consumerd32_fd = -1;
175
fb6f1fa2
YB		 176static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
177static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
178static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
179static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD		 180
181static
7753dea8 182void setup_consumerd_path(void)
fb09408a 183{
fc7a59ce 184 const char *bin, *libdir;
fb09408a 185
7753dea8
MD		 186 /*
187 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 188 * native architecture size consumer if CONFIG_CONSUMER*_PATH
189 * has not been defined.
7753dea8 190 */
ebaeda94 191#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 192 if (!consumerd32_bin[0]) {
193 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 194 }
195 if (!consumerd32_libdir[0]) {
196 consumerd32_libdir = INSTALL_LIB_PATH;
197 }
198#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 199 if (!consumerd64_bin[0]) {
200 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 201 }
ebaeda94
MD		 202 if (!consumerd64_libdir[0]) {
203 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 204 }
205#else
206#error "Unknown bitness"
207#endif
208
fb09408a
MD		 209 /*
210 * runtime env. var. overrides the build default.
211 */
fc7a59ce
AM		 212 bin = getenv("LTTNG_CONSUMERD32_BIN");
213 if (bin) {
214 consumerd32_bin = bin;
7753dea8 215 }
fc7a59ce
AM		 216 bin = getenv("LTTNG_CONSUMERD64_BIN");
217 if (bin) {
218 consumerd64_bin = bin;
ebaeda94 219 }
72f579ee 220 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
ebaeda94
MD		 221 if (libdir) {
222 consumerd32_libdir = libdir;
223 }
72f579ee 224 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD		 225 if (libdir) {
226 consumerd64_libdir = libdir;
fb09408a
MD		 227 }
228}
229
5eb91c98
DG		 230/*
231 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
232 */
233static int create_thread_poll_set(struct lttng_poll_event *events,
234 unsigned int size)
235{
236 int ret;
237
238 if (events == NULL || size == 0) {
239 ret = -1;
240 goto error;
241 }
242
243 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
244 if (ret < 0) {
245 goto error;
246 }
247
248 /* Add quit pipe */
249 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
250 if (ret < 0) {
251 goto error;
252 }
253
254 return 0;
255
256error:
257 return ret;
258}
259
260/*
261 * Check if the thread quit pipe was triggered.
262 *
263 * Return 1 if it was triggered else 0;
264 */
265static int check_thread_quit_pipe(int fd, uint32_t events)
266{
267 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
268 return 1;
269 }
270
271 return 0;
272}
273
0fdd1e2c
DG		 274/*
275 * Return group ID of the tracing group or -1 if not found.
276 */
996b65c8
MD		 277static gid_t allowed_group(void)
278{
279 struct group *grp;
280
274e143b
MD		 281 if (opt_tracing_group) {
282 grp = getgrnam(opt_tracing_group);
283 } else {
284 grp = getgrnam(default_tracing_group);
285 }
996b65c8
MD		 286 if (!grp) {
287 return -1;
288 } else {
289 return grp->gr_gid;
290 }
291}
292
273ea72c 293/*
5eb91c98 294 * Init thread quit pipe.
273ea72c
DG		 295 *
296 * Return -1 on error or 0 if all pipes are created.
297 */
298static int init_thread_quit_pipe(void)
299{
300 int ret;
301
302 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
303 if (ret < 0) {
304 perror("thread quit pipe");
305 goto error;
306 }
307
308error:
309 return ret;
310}
311
fac6795d 312/*
d063d709
DG		 313 * Complete teardown of a kernel session. This free all data structure related
314 * to a kernel session and update counter.
fac6795d 315 */
1d4b027a 316static void teardown_kernel_session(struct ltt_session *session)
fac6795d 317{
8f7a84dd 318 if (!session->kernel_session) {
99bab54f 319 DBG3("No kernel session when tearing down session");
84ea9c99 320 return;
8f7a84dd 321 }
d9800920 322
84ea9c99 323 DBG("Tearing down kernel session");
d9800920 324
84ea9c99
MD		 325 /*
326 * If a custom kernel consumer was registered, close the socket before
327 * tearing down the complete kernel session structure
328 */
329 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
330 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 331 }
84ea9c99
MD		 332
333 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 334}
335
f6a9efaa
DG		 336/*
337 * Complete teardown of all UST sessions. This will free everything on his path
338 * and destroy the core essence of all ust sessions :)
339 */
340static void teardown_ust_session(struct ltt_session *session)
341{
84cd17c6
MD		 342 int ret;
343
8f7a84dd 344 if (!session->ust_session) {
99bab54f 345 DBG3("No UST session when tearing down session");
f470a390 346 return;
8f7a84dd
DG		 347 }
348
f6a9efaa
DG		 349 DBG("Tearing down UST session(s)");
350
84cd17c6
MD		 351 ret = ust_app_destroy_trace_all(session->ust_session);
352 if (ret) {
353 ERR("Error in ust_app_destroy_trace_all");
354 }
8f7a84dd 355
f6a9efaa
DG		 356 trace_ust_destroy_session(session->ust_session);
357}
358
099e26bd
DG		 359/*
360 * Stop all threads by closing the thread quit pipe.
361 */
cf3af59e
MD		 362static void stop_threads(void)
363{
5eb91c98
DG		 364 int ret;
365
cf3af59e
MD		 366 /* Stopping all threads */
367 DBG("Terminating all threads");
54d01ffb 368 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 369 if (ret < 0) {
370 ERR("write error on thread quit pipe");
371 }
372
099e26bd
DG		 373 /* Dispatch thread */
374 dispatch_thread_exit = 1;
375 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 376}
377
fac6795d 378/*
d063d709 379 * Cleanup the daemon
fac6795d 380 */
cf3af59e 381static void cleanup(void)
fac6795d 382{
1d4b027a
DG		 383 int ret;
384 char *cmd;
af9737e9 385 struct ltt_session *sess, *stmp;
fac6795d 386
1d4b027a 387 DBG("Cleaning up");
e07ae692 388
67e40797
DG		 389 DBG("Removing %s directory", rundir);
390 ret = asprintf(&cmd, "rm -rf %s", rundir);
391 if (ret < 0) {
392 ERR("asprintf failed. Something is really wrong!");
393 }
5461b305 394
67e40797
DG		 395 /* Remove lttng run directory */
396 ret = system(cmd);
397 if (ret < 0) {
398 ERR("Unable to clean %s", rundir);
1d4b027a 399 }
67e40797 400 free(cmd);
5461b305 401
99bab54f 402 DBG("Cleaning up all sessions");
fac6795d 403
b5541356 404 /* Destroy session list mutex */
273ea72c
DG		 405 if (session_list_ptr != NULL) {
406 pthread_mutex_destroy(&session_list_ptr->lock);
407
408 /* Cleanup ALL session */
54d01ffb
DG		 409 cds_list_for_each_entry_safe(sess, stmp,
410 &session_list_ptr->head, list) {
273ea72c 411 teardown_kernel_session(sess);
f6a9efaa
DG		 412 teardown_ust_session(sess);
413 free(sess);
273ea72c
DG		 414 }
415 }
416
099e26bd 417 DBG("Closing all UST sockets");
56fff090 418 ust_app_clean_list();
099e26bd 419
3bd1e081 420 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 421
4fba7219
DG		 422 if (is_root && !opt_no_kernel) {
423 DBG2("Closing kernel fd");
424 close(kernel_tracer_fd);
2f50c8a3 425 DBG("Unloading kernel modules");
096102bd 426 modprobe_remove_lttng_all();
2f50c8a3 427 }
b25a8868 428
5eb91c98
DG		 429 close(thread_quit_pipe[0]);
430 close(thread_quit_pipe[1]);
dab4c8a1 431
3c6bae61
DG		 432 /* OUTPUT BENCHMARK RESULTS */
433 bench_init();
434
62d53818
DG		 435 if (getenv("BENCH_UST_NOTIFY")) {
436 bench_print_ust_notification();
437 }
438
439 if (getenv("BENCH_UST_REGISTER")) {
440 bench_print_ust_register();
ccca3fea 441 bench_print_ust_unregister();
62d53818
DG		 442 }
443
444 if (getenv("BENCH_BOOT_PROCESS")) {
445 bench_print_boot_process();
446 }
3c6bae61
DG		 447
448 bench_close();
449 /* END BENCHMARK */
bb3037a9 450
421cb601 451 /* <fun> */
f56a39af 452 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG		 453 "Matthew, BEET driven development works!%c[%dm",
454 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
455 /* </fun> */
fac6795d
DG		 456}
457
e065084a 458/*
d063d709 459 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 460 *
d063d709 461 * Return lttcomm error code.
e065084a
DG		 462 */
463static int send_unix_sock(int sock, void *buf, size_t len)
464{
465 /* Check valid length */
466 if (len <= 0) {
467 return -1;
468 }
469
470 return lttcomm_send_unix_sock(sock, buf, len);
471}
472
5461b305 473/*
d063d709 474 * Free memory of a command context structure.
5461b305 475 */
a2fb29a5 476static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 477{
a2fb29a5
DG		 478 DBG("Clean command context structure");
479 if (*cmd_ctx) {
480 if ((*cmd_ctx)->llm) {
481 free((*cmd_ctx)->llm);
5461b305 482 }
a2fb29a5
DG		 483 if ((*cmd_ctx)->lsm) {
484 free((*cmd_ctx)->lsm);
5461b305 485 }
a2fb29a5
DG		 486 free(*cmd_ctx);
487 *cmd_ctx = NULL;
5461b305
DG		 488 }
489}
490
f3ed775e 491/*
d063d709 492 * Send all stream fds of kernel channel to the consumer.
f3ed775e 493 */
2bdd86d4 494static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD		 495 int sock, struct ltt_kernel_channel *channel,
496 uid_t uid, gid_t gid)
f3ed775e
DG		 497{
498 int ret;
f3ed775e 499 struct ltt_kernel_stream *stream;
3bd1e081 500 struct lttcomm_consumer_msg lkm;
f3ed775e 501
3bd1e081 502 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 503 channel->channel->name);
7a485870 504
3bd1e081
MD		 505 /* Send channel */
506 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
507 lkm.u.channel.channel_key = channel->fd;
508 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
509 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 510 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 511 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 512 if (ret < 0) {
3bd1e081 513 perror("send consumer channel");
f3ed775e
DG		 514 goto error;
515 }
516
3bd1e081 517 /* Send streams */
7a485870 518 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 519 if (!stream->fd) {
520 continue;
521 }
522 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
523 lkm.u.stream.channel_key = channel->fd;
524 lkm.u.stream.stream_key = stream->fd;
525 lkm.u.stream.state = stream->state;
526 lkm.u.stream.output = channel->channel->attr.output;
527 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 528 lkm.u.stream.uid = uid;
529 lkm.u.stream.gid = gid;
3bd1e081
MD		 530 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
531 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
532 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
533 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
534 if (ret < 0) {
535 perror("send consumer stream");
536 goto error;
537 }
538 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
539 if (ret < 0) {
540 perror("send consumer stream ancillary data");
541 goto error;
f3ed775e
DG		 542 }
543 }
544
3bd1e081 545 DBG("consumer channel streams sent");
f3ed775e
DG		 546
547 return 0;
548
549error:
550 return ret;
551}
552
553/*
d063d709 554 * Send all stream fds of the kernel session to the consumer.
f3ed775e 555 */
2bdd86d4 556static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 557 struct ltt_kernel_session *session)
f3ed775e
DG		 558{
559 int ret;
560 struct ltt_kernel_channel *chan;
3bd1e081
MD		 561 struct lttcomm_consumer_msg lkm;
562 int sock = session->consumer_fd;
7a485870
DG		 563
564 DBG("Sending metadata stream fd");
565
2bdd86d4 566 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 567 if (session->consumer_fd == 0) {
3bd1e081 568 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 569 }
570
7a485870 571 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 572 /* Send metadata channel fd */
573 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
574 lkm.u.channel.channel_key = session->metadata->fd;
575 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
576 lkm.u.channel.mmap_len = 0; /* for kernel */
577 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
578 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
579 if (ret < 0) {
580 perror("send consumer channel");
581 goto error;
582 }
583
584 /* Send metadata stream fd */
585 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
586 lkm.u.stream.channel_key = session->metadata->fd;
587 lkm.u.stream.stream_key = session->metadata_stream_fd;
588 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
589 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
590 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 591 lkm.u.stream.uid = session->uid;
592 lkm.u.stream.gid = session->gid;
3bd1e081
MD		 593 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
594 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
595 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
596 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
7a485870 597 if (ret < 0) {
3bd1e081
MD		 598 perror("send consumer stream");
599 goto error;
600 }
601 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 602 if (ret < 0) {
3bd1e081 603 perror("send consumer stream");
7a485870
DG		 604 goto error;
605 }
606 }
f3ed775e 607
f3ed775e 608 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD		 609 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
610 session->uid, session->gid);
f3ed775e 611 if (ret < 0) {
7a485870 612 goto error;
f3ed775e
DG		 613 }
614 }
615
2bdd86d4 616 DBG("consumer fds (metadata and channel streams) sent");
7a485870 617
f3ed775e
DG		 618 return 0;
619
620error:
621 return ret;
622}
623
fac6795d 624/*
0fdd1e2c 625 * Notify UST applications using the shm mmap futex.
fac6795d 626 */
0fdd1e2c 627static int notify_ust_apps(int active)
fac6795d 628{
0fdd1e2c 629 char *wait_shm_mmap;
fac6795d 630
0fdd1e2c 631 DBG("Notifying applications of session daemon state: %d", active);
fac6795d 632
62d53818
DG		 633 tracepoint(ust_notify_apps_start);
634
0fdd1e2c
DG		 635 /* See shm.c for this call implying mmap, shm and futex calls */
636 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
637 if (wait_shm_mmap == NULL) {
fac6795d
DG		 638 goto error;
639 }
640
0fdd1e2c
DG		 641 /* Wake waiting process */
642 futex_wait_update((int32_t *) wait_shm_mmap, active);
643
62d53818
DG		 644 tracepoint(ust_notify_apps_stop);
645
0fdd1e2c
DG		 646 /* Apps notified successfully */
647 return 0;
fac6795d
DG		 648
649error:
0fdd1e2c 650 return -1;
fac6795d
DG		 651}
652
e065084a 653/*
d063d709
DG		 654 * Setup the outgoing data buffer for the response (llm) by allocating the
655 * right amount of memory and copying the original information from the lsm
656 * structure.
ca95a216 657 *
d063d709 658 * Return total size of the buffer pointed by buf.
ca95a216 659 */
5461b305 660static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 661{
f3ed775e 662 int ret, buf_size;
ca95a216 663
f3ed775e 664 buf_size = size;
5461b305 665
ba7f0ae5 666 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 667 if (cmd_ctx->llm == NULL) {
ba7f0ae5 668 perror("zmalloc");
5461b305 669 ret = -ENOMEM;
ca95a216
DG		 670 goto error;
671 }
672
5461b305
DG		 673 /* Copy common data */
674 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 675 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 676
5461b305
DG		 677 cmd_ctx->llm->data_size = size;
678 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
679
ca95a216
DG		 680 return buf_size;
681
682error:
683 return ret;
684}
685
7a485870 686/*
5eb91c98 687 * Update the kernel poll set of all channel fd available over all tracing
d063d709 688 * session. Add the wakeup pipe at the end of the set.
7a485870 689 */
5eb91c98 690static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 691{
5eb91c98 692 int ret;
7a485870
DG		 693 struct ltt_session *session;
694 struct ltt_kernel_channel *channel;
695
5eb91c98 696 DBG("Updating kernel poll set");
7a485870 697
54d01ffb 698 session_lock_list();
b5541356 699 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 700 session_lock(session);
7a485870 701 if (session->kernel_session == NULL) {
54d01ffb 702 session_unlock(session);
7a485870
DG		 703 continue;
704 }
7a485870 705
54d01ffb
DG		 706 cds_list_for_each_entry(channel,
707 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 708 /* Add channel fd to the kernel poll set */
709 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
710 if (ret < 0) {
54d01ffb 711 session_unlock(session);
5eb91c98
DG		 712 goto error;
713 }
714 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 715 }
54d01ffb 716 session_unlock(session);
7a485870 717 }
54d01ffb 718 session_unlock_list();
7a485870 719
5eb91c98 720 return 0;
7a485870
DG		 721
722error:
54d01ffb 723 session_unlock_list();
7a485870
DG		 724 return -1;
725}
726
727/*
54d01ffb 728 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 729 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 730 *
d063d709 731 * Useful for CPU hotplug feature.
7a485870 732 */
2bdd86d4 733static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 734{
735 int ret = 0;
736 struct ltt_session *session;
737 struct ltt_kernel_channel *channel;
738
739 DBG("Updating kernel streams for channel fd %d", fd);
740
54d01ffb 741 session_lock_list();
b5541356 742 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 743 session_lock(session);
7a485870 744 if (session->kernel_session == NULL) {
54d01ffb 745 session_unlock(session);
7a485870
DG		 746 continue;
747 }
d9800920
DG		 748
749 /* This is not suppose to be 0 but this is an extra security check */
750 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 751 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 752 }
753
5eb91c98
DG		 754 cds_list_for_each_entry(channel,
755 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 756 if (channel->fd == fd) {
757 DBG("Channel found, updating kernel streams");
758 ret = kernel_open_channel_stream(channel);
759 if (ret < 0) {
b3c750d2 760 goto error;
7a485870 761 }
d9800920 762
7a485870 763 /*
5eb91c98
DG		 764 * Have we already sent fds to the consumer? If yes, it means
765 * that tracing is started so it is safe to send our updated
766 * stream fds.
7a485870 767 */
3bd1e081 768 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 769 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD		 770 session->kernel_session->consumer_fd, channel,
771 session->uid, session->gid);
7a485870 772 if (ret < 0) {
b3c750d2 773 goto error;
7a485870
DG		 774 }
775 }
b3c750d2 776 goto error;
7a485870
DG		 777 }
778 }
54d01ffb 779 session_unlock(session);
7a485870 780 }
54d01ffb 781 session_unlock_list();
b3c750d2 782 return ret;
7a485870 783
b3c750d2 784error:
54d01ffb
DG		 785 session_unlock(session);
786 session_unlock_list();
7a485870
DG		 787 return ret;
788}
789
487cf67c
DG		 790/*
791 * For each tracing session, update newly registered apps.
792 */
793static void update_ust_app(int app_sock)
794{
795 struct ltt_session *sess, *stmp;
796
4ee14516
DG		 797 session_lock_list();
798
487cf67c
DG		 799 /* For all tracing session(s) */
800 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 801 session_lock(sess);
421cb601
DG		 802 if (sess->ust_session) {
803 ust_app_global_update(sess->ust_session, app_sock);
804 }
4ee14516 805 session_unlock(sess);
487cf67c 806 }
4ee14516
DG		 807
808 session_unlock_list();
487cf67c
DG		 809}
810
7a485870 811/*
d063d709 812 * This thread manage event coming from the kernel.
7a485870 813 *
d063d709
DG		 814 * Features supported in this thread:
815 * -) CPU Hotplug
7a485870
DG		 816 */
817static void *thread_manage_kernel(void *data)
818{
5eb91c98
DG		 819 int ret, i, pollfd, update_poll_flag = 1;
820 uint32_t revents, nb_fd;
7a485870 821 char tmp;
5eb91c98 822 struct lttng_poll_event events;
7a485870 823
b25a8868
DG		 824 tracepoint(sessiond_th_kern_start);
825
7a485870
DG		 826 DBG("Thread manage kernel started");
827
5eb91c98
DG		 828 ret = create_thread_poll_set(&events, 2);
829 if (ret < 0) {
830 goto error;
831 }
832
833 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
834 if (ret < 0) {
835 goto error;
836 }
837
7a485870
DG		 838 while (1) {
839 if (update_poll_flag == 1) {
5f822d0a
DG		 840 /*
841 * Reset number of fd in the poll set. Always 2 since there is the thread
842 * quit pipe and the kernel pipe.
843 */
844 events.nb_fd = 2;
845
5eb91c98
DG		 846 ret = update_kernel_poll(&events);
847 if (ret < 0) {
7a485870
DG		 848 goto error;
849 }
850 update_poll_flag = 0;
851 }
852
5eb91c98
DG		 853 nb_fd = LTTNG_POLL_GETNB(&events);
854
855 DBG("Thread kernel polling on %d fds", nb_fd);
856
857 /* Zeroed the poll events */
858 lttng_poll_reset(&events);
7a485870 859
b25a8868
DG		 860 tracepoint(sessiond_th_kern_poll);
861
7a485870 862 /* Poll infinite value of time */
5eb91c98 863 ret = lttng_poll_wait(&events, -1);
7a485870 864 if (ret < 0) {
7a485870
DG		 865 goto error;
866 } else if (ret == 0) {
867 /* Should not happen since timeout is infinite */
85611738
DG		 868 ERR("Return value of poll is 0 with an infinite timeout.\n"
869 "This should not have happened! Continuing...");
7a485870
DG		 870 continue;
871 }
872
5eb91c98
DG		 873 for (i = 0; i < nb_fd; i++) {
874 /* Fetch once the poll data */
875 revents = LTTNG_POLL_GETEV(&events, i);
876 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 877
5eb91c98
DG		 878 /* Thread quit pipe has been closed. Killing thread. */
879 ret = check_thread_quit_pipe(pollfd, revents);
880 if (ret) {
881 goto error;
882 }
7a485870 883
5eb91c98
DG		 884 /* Check for data on kernel pipe */
885 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
886 ret = read(kernel_poll_pipe[0], &tmp, 1);
887 update_poll_flag = 1;
888 continue;
889 } else {
890 /*
891 * New CPU detected by the kernel. Adding kernel stream to
892 * kernel session and updating the kernel consumer
893 */
894 if (revents & LPOLLIN) {
2bdd86d4 895 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 896 if (ret < 0) {
897 continue;
898 }
899 break;
900 /*
901 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
902 * and unregister kernel stream at this point.
903 */
7a485870 904 }
7a485870
DG		 905 }
906 }
907 }
908
909error:
910 DBG("Kernel thread dying");
273ea72c
DG		 911 close(kernel_poll_pipe[0]);
912 close(kernel_poll_pipe[1]);
5eb91c98
DG		 913
914 lttng_poll_clean(&events);
915
7a485870
DG		 916 return NULL;
917}
918
1d4b027a 919/*
3bd1e081 920 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 921 */
3bd1e081 922static void *thread_manage_consumer(void *data)
1d4b027a 923{
5eb91c98
DG		 924 int sock = 0, i, ret, pollfd;
925 uint32_t revents, nb_fd;
1d4b027a 926 enum lttcomm_return_code code;
5eb91c98 927 struct lttng_poll_event events;
3bd1e081 928 struct consumer_data *consumer_data = data;
1d4b027a 929
b25a8868
DG		 930 tracepoint(sessiond_th_kcon_start);
931
3bd1e081 932 DBG("[thread] Manage consumer started");
1d4b027a 933
3bd1e081 934 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 935 if (ret < 0) {
936 goto error;
937 }
938
5eb91c98
DG		 939 /*
940 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
941 * Nothing more will be added to this poll set.
942 */
943 ret = create_thread_poll_set(&events, 2);
944 if (ret < 0) {
945 goto error;
946 }
273ea72c 947
3bd1e081 948 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 949 if (ret < 0) {
950 goto error;
951 }
273ea72c 952
5eb91c98 953 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c 954
b25a8868
DG		 955 tracepoint(sessiond_th_kcon_poll);
956
273ea72c 957 /* Inifinite blocking call, waiting for transmission */
5eb91c98 958 ret = lttng_poll_wait(&events, -1);
273ea72c 959 if (ret < 0) {
273ea72c
DG		 960 goto error;
961 }
962
5eb91c98
DG		 963 for (i = 0; i < nb_fd; i++) {
964 /* Fetch once the poll data */
965 revents = LTTNG_POLL_GETEV(&events, i);
966 pollfd = LTTNG_POLL_GETFD(&events, i);
967
968 /* Thread quit pipe has been closed. Killing thread. */
969 ret = check_thread_quit_pipe(pollfd, revents);
970 if (ret) {
971 goto error;
972 }
973
974 /* Event on the registration socket */
3bd1e081 975 if (pollfd == consumer_data->err_sock) {
5eb91c98 976 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 977 ERR("consumer err socket poll error");
5eb91c98
DG		 978 goto error;
979 }
980 }
273ea72c
DG		 981 }
982
3bd1e081 983 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 984 if (sock < 0) {
985 goto error;
986 }
987
3bd1e081 988 DBG2("Receiving code from consumer err_sock");
ee0b0061 989
712ea556 990 /* Getting status code from kconsumerd */
54d01ffb
DG		 991 ret = lttcomm_recv_unix_sock(sock, &code,
992 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 993 if (ret <= 0) {
994 goto error;
995 }
996
3bd1e081
MD		 997 if (code == CONSUMERD_COMMAND_SOCK_READY) {
998 consumer_data->cmd_sock =
999 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1000 if (consumer_data->cmd_sock < 0) {
1001 sem_post(&consumer_data->sem);
48842b30 1002 PERROR("consumer connect");
1d4b027a
DG		 1003 goto error;
1004 }
1005 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 1006 sem_post(&consumer_data->sem);
1007 DBG("consumer command socket ready");
1d4b027a 1008 } else {
3bd1e081 1009 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 1010 lttcomm_get_readable_code(-code));
1011 goto error;
1012 }
1013
54d01ffb 1014 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1015 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1016 if (ret < 0) {
72079cae
DG		 1017 goto error;
1018 }
1019
5eb91c98
DG		 1020 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1021 if (ret < 0) {
72079cae 1022 goto error;
5eb91c98
DG		 1023 }
1024
1025 /* Update number of fd */
1026 nb_fd = LTTNG_POLL_GETNB(&events);
1027
1028 /* Inifinite blocking call, waiting for transmission */
1029 ret = lttng_poll_wait(&events, -1);
1030 if (ret < 0) {
72079cae
DG		 1031 goto error;
1032 }
1033
5eb91c98
DG		 1034 for (i = 0; i < nb_fd; i++) {
1035 /* Fetch once the poll data */
1036 revents = LTTNG_POLL_GETEV(&events, i);
1037 pollfd = LTTNG_POLL_GETFD(&events, i);
1038
1039 /* Thread quit pipe has been closed. Killing thread. */
1040 ret = check_thread_quit_pipe(pollfd, revents);
1041 if (ret) {
1042 goto error;
1043 }
1044
1045 /* Event on the kconsumerd socket */
1046 if (pollfd == sock) {
1047 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1048 ERR("consumer err socket second poll error");
5eb91c98
DG		 1049 goto error;
1050 }
1051 }
1052 }
1053
712ea556 1054 /* Wait for any kconsumerd error */
54d01ffb
DG		 1055 ret = lttcomm_recv_unix_sock(sock, &code,
1056 sizeof(enum lttcomm_return_code));
712ea556 1057 if (ret <= 0) {
3bd1e081 1058 ERR("consumer closed the command socket");
712ea556 1059 goto error;
6f61d021 1060 }
1d4b027a 1061
3bd1e081 1062 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1063
1d4b027a 1064error:
3bd1e081
MD		 1065 DBG("consumer thread dying");
1066 close(consumer_data->err_sock);
1067 close(consumer_data->cmd_sock);
5eb91c98 1068 close(sock);
273ea72c 1069
3bd1e081
MD		 1070 unlink(consumer_data->err_unix_sock_path);
1071 unlink(consumer_data->cmd_unix_sock_path);
1072 consumer_data->pid = 0;
0177d773 1073
5eb91c98 1074 lttng_poll_clean(&events);
0177d773 1075
5eb91c98 1076 return NULL;
099e26bd
DG		 1077}
1078
099e26bd
DG		 1079/*
1080 * This thread manage application communication.
1d4b027a
DG		 1081 */
1082static void *thread_manage_apps(void *data)
099e26bd 1083{
5eb91c98
DG		 1084 int i, ret, pollfd;
1085 uint32_t revents, nb_fd;
099e26bd 1086 struct ust_command ust_cmd;
5eb91c98 1087 struct lttng_poll_event events;
099e26bd 1088
85c434ee
DG		 1089 tracepoint(sessiond_th_apps_start);
1090
099e26bd
DG		 1091 DBG("[thread] Manage application started");
1092
f6a9efaa
DG		 1093 rcu_register_thread();
1094 rcu_thread_online();
1095
5eb91c98
DG		 1096 ret = create_thread_poll_set(&events, 2);
1097 if (ret < 0) {
1098 goto error;
1099 }
099e26bd 1100
5eb91c98
DG		 1101 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1102 if (ret < 0) {
1103 goto error;
1104 }
099e26bd 1105
5eb91c98
DG		 1106 while (1) {
1107 /* Zeroed the events structure */
1108 lttng_poll_reset(&events);
0177d773 1109
5eb91c98 1110 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1111
1112 DBG("Apps thread polling on %d fds", nb_fd);
1113
85c434ee
DG		 1114 tracepoint(sessiond_th_apps_poll);
1115
099e26bd 1116 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1117 ret = lttng_poll_wait(&events, -1);
099e26bd 1118 if (ret < 0) {
099e26bd
DG		 1119 goto error;
1120 }
1121
5eb91c98
DG		 1122 for (i = 0; i < nb_fd; i++) {
1123 /* Fetch once the poll data */
1124 revents = LTTNG_POLL_GETEV(&events, i);
1125 pollfd = LTTNG_POLL_GETFD(&events, i);
1126
1127 /* Thread quit pipe has been closed. Killing thread. */
1128 ret = check_thread_quit_pipe(pollfd, revents);
1129 if (ret) {
099e26bd 1130 goto error;
5eb91c98 1131 }
62d53818 1132
5eb91c98
DG		 1133 /* Inspect the apps cmd pipe */
1134 if (pollfd == apps_cmd_pipe[0]) {
1135 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1136 ERR("Apps command pipe error");
0177d773 1137 goto error;
5eb91c98 1138 } else if (revents & LPOLLIN) {
dab4c8a1 1139 tracepoint(ust_register_read_start);
5eb91c98
DG		 1140 /* Empty pipe */
1141 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1142 if (ret < 0 || ret < sizeof(ust_cmd)) {
1143 perror("read apps cmd pipe");
1144 goto error;
1145 }
a89c7d1b 1146 tracepoint(ust_register_read_stop);
099e26bd 1147
a89c7d1b 1148 tracepoint(ust_register_add_start);
5eb91c98 1149 /* Register applicaton to the session daemon */
56fff090 1150 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1151 ust_cmd.sock);
88ff5b7f 1152 if (ret == -ENOMEM) {
5eb91c98 1153 goto error;
88ff5b7f
MD		 1154 } else if (ret < 0) {
1155 break;
5eb91c98 1156 }
a89c7d1b 1157 tracepoint(ust_register_add_stop);
85c434ee 1158
a89c7d1b 1159 tracepoint(ust_register_done_start);
acc7b41b 1160 /*
e0c7ec2b 1161 * Validate UST version compatibility.
acc7b41b 1162 */
e0c7ec2b
DG		 1163 ret = ust_app_validate_version(ust_cmd.sock);
1164 if (ret >= 0) {
1165 /*
1166 * Add channel(s) and event(s) to newly registered apps
1167 * from lttng global UST domain.
1168 */
1169 update_ust_app(ust_cmd.sock);
1170 }
acc7b41b 1171
f2ca2e25 1172 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG		 1173 if (ret < 0) {
1174 /*
1175 * If the registration is not possible, we simply
1176 * unregister the apps and continue
1177 */
56fff090 1178 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1179 } else {
1180 /*
1181 * We just need here to monitor the close of the UST
1182 * socket and poll set monitor those by default.
1183 */
1184 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1185 if (ret < 0) {
1186 goto error;
1187 }
1188
54d01ffb
DG		 1189 DBG("Apps with sock %d added to poll set",
1190 ust_cmd.sock);
5eb91c98 1191 }
a89c7d1b 1192 tracepoint(ust_register_done_stop);
5eb91c98 1193 break;
0177d773 1194 }
5eb91c98
DG		 1195 } else {
1196 /*
54d01ffb
DG		 1197 * At this point, we know that a registered application made
1198 * the event at poll_wait.
5eb91c98
DG		 1199 */
1200 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
aa231298
DG		 1201 tracepoint(ust_unregister_start);
1202
5eb91c98
DG		 1203 /* Removing from the poll set */
1204 ret = lttng_poll_del(&events, pollfd);
1205 if (ret < 0) {
1206 goto error;
1207 }
099e26bd 1208
b9d9b220 1209 /* Socket closed on remote end. */
56fff090 1210 ust_app_unregister(pollfd);
aa231298
DG		 1211
1212 tracepoint(ust_unregister_stop);
5eb91c98 1213 break;
0177d773 1214 }
099e26bd
DG		 1215 }
1216 }
099e26bd
DG		 1217 }
1218
1219error:
1220 DBG("Application communication apps dying");
1221 close(apps_cmd_pipe[0]);
1222 close(apps_cmd_pipe[1]);
1223
5eb91c98 1224 lttng_poll_clean(&events);
099e26bd 1225
f6a9efaa
DG		 1226 rcu_thread_offline();
1227 rcu_unregister_thread();
099e26bd
DG		 1228 return NULL;
1229}
1230
1231/*
1232 * Dispatch request from the registration threads to the application
1233 * communication thread.
1234 */
1235static void *thread_dispatch_ust_registration(void *data)
1236{
1237 int ret;
1238 struct cds_wfq_node *node;
1239 struct ust_command *ust_cmd = NULL;
1240
85c434ee
DG		 1241 tracepoint(sessiond_th_dispatch_start);
1242
099e26bd
DG		 1243 DBG("[thread] Dispatch UST command started");
1244
1245 while (!dispatch_thread_exit) {
1246 /* Atomically prepare the queue futex */
1247 futex_nto1_prepare(&ust_cmd_queue.futex);
1248
1249 do {
85c434ee
DG		 1250 tracepoint(sessiond_th_dispatch_block);
1251
099e26bd
DG		 1252 /* Dequeue command for registration */
1253 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1254 if (node == NULL) {
00a17c97 1255 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1256 /* Continue thread execution */
1257 break;
1258 }
1259
62d53818
DG		 1260 tracepoint(ust_dispatch_register_start);
1261
099e26bd
DG		 1262 ust_cmd = caa_container_of(node, struct ust_command, node);
1263
2f50c8a3
DG		 1264 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1265 " gid:%d sock:%d name:%s (version %d.%d)",
1266 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1267 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1268 ust_cmd->sock, ust_cmd->reg_msg.name,
1269 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1270 /*
1271 * Inform apps thread of the new application registration. This
1272 * call is blocking so we can be assured that the data will be read
1273 * at some point in time or wait to the end of the world :)
1274 */
1275 ret = write(apps_cmd_pipe[1], ust_cmd,
1276 sizeof(struct ust_command));
1277 if (ret < 0) {
1278 perror("write apps cmd pipe");
1279 if (errno == EBADF) {
1280 /*
1281 * We can't inform the application thread to process
1282 * registration. We will exit or else application
1283 * registration will not occur and tracing will never
1284 * start.
1285 */
1286 goto error;
1287 }
1288 }
1289 free(ust_cmd);
1290 } while (node != NULL);
1291
62d53818
DG		 1292 tracepoint(ust_dispatch_register_stop);
1293
099e26bd
DG		 1294 /* Futex wait on queue. Blocking call on futex() */
1295 futex_nto1_wait(&ust_cmd_queue.futex);
1296 }
1297
1298error:
1299 DBG("Dispatch thread dying");
1300 return NULL;
1301}
1302
1303/*
1304 * This thread manage application registration.
1305 */
1306static void *thread_registration_apps(void *data)
1d4b027a 1307{
5eb91c98
DG		 1308 int sock = 0, i, ret, pollfd;
1309 uint32_t revents, nb_fd;
1310 struct lttng_poll_event events;
099e26bd
DG		 1311 /*
1312 * Get allocated in this thread, enqueued to a global queue, dequeued and
1313 * freed in the manage apps thread.
1314 */
1315 struct ust_command *ust_cmd = NULL;
1d4b027a 1316
62d53818 1317 tracepoint(sessiond_th_reg_start);
b25a8868 1318
099e26bd 1319 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1320
1321 ret = lttcomm_listen_unix_sock(apps_sock);
1322 if (ret < 0) {
1323 goto error;
1324 }
1325
5eb91c98
DG		 1326 /*
1327 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1328 * more will be added to this poll set.
1329 */
1330 ret = create_thread_poll_set(&events, 2);
1331 if (ret < 0) {
1332 goto error;
1333 }
273ea72c 1334
5eb91c98
DG		 1335 /* Add the application registration socket */
1336 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1337 if (ret < 0) {
1338 goto error;
1339 }
273ea72c 1340
1d4b027a 1341 /* Notify all applications to register */
0fdd1e2c
DG		 1342 ret = notify_ust_apps(1);
1343 if (ret < 0) {
1344 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1345 "Execution continues but there might be problem for already\n"
1346 "running applications that wishes to register.");
0fdd1e2c 1347 }
1d4b027a
DG		 1348
1349 while (1) {
1350 DBG("Accepting application registration");
273ea72c 1351
62d53818 1352 tracepoint(sessiond_th_reg_poll);
b25a8868 1353
5eb91c98
DG		 1354 nb_fd = LTTNG_POLL_GETNB(&events);
1355
273ea72c 1356 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1357 ret = lttng_poll_wait(&events, -1);
273ea72c 1358 if (ret < 0) {
273ea72c
DG		 1359 goto error;
1360 }
1361
5eb91c98
DG		 1362 for (i = 0; i < nb_fd; i++) {
1363 /* Fetch once the poll data */
1364 revents = LTTNG_POLL_GETEV(&events, i);
1365 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1366
5eb91c98
DG		 1367 /* Thread quit pipe has been closed. Killing thread. */
1368 ret = check_thread_quit_pipe(pollfd, revents);
1369 if (ret) {
90014c57
DG		 1370 goto error;
1371 }
62d53818 1372
5eb91c98
DG		 1373 /* Event on the registration socket */
1374 if (pollfd == apps_sock) {
1375 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1376 ERR("Register apps socket poll error");
1377 goto error;
1378 } else if (revents & LPOLLIN) {
dab4c8a1
DG		 1379 /* Registration starts here. Recording cycles */
1380 tracepoint(ust_register_start);
1d4b027a 1381
5eb91c98
DG		 1382 sock = lttcomm_accept_unix_sock(apps_sock);
1383 if (sock < 0) {
1384 goto error;
1385 }
099e26bd 1386
5eb91c98 1387 /* Create UST registration command for enqueuing */
ba7f0ae5 1388 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1389 if (ust_cmd == NULL) {
ba7f0ae5 1390 perror("ust command zmalloc");
5eb91c98
DG		 1391 goto error;
1392 }
1d4b027a 1393
5eb91c98
DG		 1394 /*
1395 * Using message-based transmissions to ensure we don't
1396 * have to deal with partially received messages.
1397 */
1398 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1399 sizeof(struct ust_register_msg));
1400 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1401 if (ret < 0) {
1402 perror("lttcomm_recv_unix_sock register apps");
1403 } else {
1404 ERR("Wrong size received on apps register");
1405 }
1406 free(ust_cmd);
1407 close(sock);
1408 continue;
1409 }
099e26bd 1410
5eb91c98 1411 ust_cmd->sock = sock;
099e26bd 1412
5eb91c98
DG		 1413 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1414 " gid:%d sock:%d name:%s (version %d.%d)",
1415 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1416 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1417 ust_cmd->sock, ust_cmd->reg_msg.name,
1418 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1419
5eb91c98
DG		 1420 /*
1421 * Lock free enqueue the registration request. The red pill
54d01ffb 1422 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1423 */
1424 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
62d53818 1425
5eb91c98
DG		 1426 /*
1427 * Wake the registration queue futex. Implicit memory
1428 * barrier with the exchange in cds_wfq_enqueue.
1429 */
1430 futex_nto1_wake(&ust_cmd_queue.futex);
dab4c8a1
DG		 1431
1432 tracepoint(ust_register_stop);
5eb91c98
DG		 1433 }
1434 }
90014c57 1435 }
1d4b027a
DG		 1436 }
1437
1438error:
0fdd1e2c
DG		 1439 DBG("UST Registration thread dying");
1440
1441 /* Notify that the registration thread is gone */
1442 notify_ust_apps(0);
1443
1444 close(apps_sock);
1445 close(sock);
273ea72c 1446 unlink(apps_unix_sock_path);
0fdd1e2c 1447
5eb91c98
DG		 1448 lttng_poll_clean(&events);
1449
1d4b027a
DG		 1450 return NULL;
1451}
1452
8c0faa1d 1453/*
3bd1e081 1454 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1455 * exec or it will fails.
8c0faa1d 1456 */
3bd1e081 1457static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1458{
1459 int ret;
ee0b0061
DG		 1460 struct timespec timeout;
1461
1462 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1463 timeout.tv_nsec = 0;
8c0faa1d
DG		 1464
1465 /* Setup semaphore */
3bd1e081 1466 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1467 if (ret < 0) {
3bd1e081 1468 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1469 goto error;
1470 }
8c0faa1d 1471
3bd1e081
MD		 1472 ret = pthread_create(&consumer_data->thread, NULL,
1473 thread_manage_consumer, consumer_data);
8c0faa1d 1474 if (ret != 0) {
3bd1e081 1475 PERROR("pthread_create consumer");
ee0b0061 1476 ret = -1;
8c0faa1d
DG		 1477 goto error;
1478 }
1479
ee0b0061
DG		 1480 /* Get time for sem_timedwait absolute timeout */
1481 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1482 if (ret < 0) {
3bd1e081 1483 PERROR("clock_gettime spawn consumer");
ee0b0061 1484 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1485 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1486 } else {
1487 /* Normal timeout if the gettime was successful */
1488 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1489 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1490 }
8c0faa1d 1491
ee0b0061
DG		 1492 if (ret < 0) {
1493 if (errno == ETIMEDOUT) {
1494 /*
1495 * Call has timed out so we kill the kconsumerd_thread and return
1496 * an error.
1497 */
3bd1e081
MD		 1498 ERR("The consumer thread was never ready. Killing it");
1499 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1500 if (ret < 0) {
3bd1e081 1501 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1502 }
1503 } else {
3bd1e081 1504 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1505 }
1506 goto error;
1507 }
1508
3bd1e081
MD		 1509 pthread_mutex_lock(&consumer_data->pid_mutex);
1510 if (consumer_data->pid == 0) {
712ea556 1511 ERR("Kconsumerd did not start");
3bd1e081 1512 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1513 goto error;
1514 }
3bd1e081 1515 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1516
8c0faa1d
DG		 1517 return 0;
1518
1519error:
1520 return ret;
1521}
1522
d9800920 1523/*
3bd1e081 1524 * Join consumer thread
d9800920 1525 */
3bd1e081 1526static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1527{
1528 void *status;
1529 int ret;
1530
3bd1e081
MD		 1531 if (consumer_data->pid != 0) {
1532 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1533 if (ret) {
3bd1e081 1534 ERR("Error killing consumer daemon");
cf3af59e
MD		 1535 return ret;
1536 }
3bd1e081 1537 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1538 } else {
1539 return 0;
1540 }
1541}
1542
8c0faa1d 1543/*
3bd1e081 1544 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1545 *
d063d709 1546 * Return pid if successful else -1.
8c0faa1d 1547 */
3bd1e081 1548static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1549{
1550 int ret;
1551 pid_t pid;
94c55f17 1552 const char *consumer_to_use;
53086306 1553 const char *verbosity;
94c55f17 1554 struct stat st;
8c0faa1d 1555
3bd1e081 1556 DBG("Spawning consumerd");
c49dc785 1557
8c0faa1d
DG		 1558 pid = fork();
1559 if (pid == 0) {
1560 /*
3bd1e081 1561 * Exec consumerd.
8c0faa1d 1562 */
daee5345 1563 if (opt_verbose_consumer) {
53086306
DG		 1564 verbosity = "--verbose";
1565 } else {
1566 verbosity = "--quiet";
1567 }
3bd1e081
MD		 1568 switch (consumer_data->type) {
1569 case LTTNG_CONSUMER_KERNEL:
94c55f17 1570 /*
c7704d57
DG		 1571 * Find out which consumerd to execute. We will first try the
1572 * 64-bit path, then the sessiond's installation directory, and
1573 * fallback on the 32-bit one,
94c55f17 1574 */
63a799e8
AM		 1575 DBG3("Looking for a kernel consumer at these locations:");
1576 DBG3(" 1) %s", consumerd64_bin);
1577 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1578 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1579 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1580 DBG3("Found location #1");
94c55f17 1581 consumer_to_use = consumerd64_bin;
94c55f17 1582 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1583 DBG3("Found location #2");
94c55f17 1584 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1585 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1586 DBG3("Found location #3");
eb1e0bd4 1587 consumer_to_use = consumerd32_bin;
94c55f17 1588 } else {
63a799e8 1589 DBG("Could not find any valid consumerd executable");
94c55f17
AM		 1590 break;
1591 }
1592 DBG("Using kernel consumer at: %s", consumer_to_use);
1593 execl(consumer_to_use,
1594 "lttng-consumerd", verbosity, "-k",
1595 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1596 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1597 NULL);
3bd1e081 1598 break;
7753dea8
MD		 1599 case LTTNG_CONSUMER64_UST:
1600 {
b1e0b6b6 1601 char *tmpnew = NULL;
8f4905da
MD		 1602
1603 if (consumerd64_libdir[0] != '\0') {
1604 char *tmp;
1605 size_t tmplen;
1606
1607 tmp = getenv("LD_LIBRARY_PATH");
1608 if (!tmp) {
1609 tmp = "";
1610 }
1611 tmplen = strlen("LD_LIBRARY_PATH=")
1612 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1613 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1614 if (!tmpnew) {
1615 ret = -ENOMEM;
1616 goto error;
1617 }
1618 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1619 strcat(tmpnew, consumerd64_libdir);
1620 if (tmp[0] != '\0') {
1621 strcat(tmpnew, ":");
1622 strcat(tmpnew, tmp);
1623 }
1624 ret = putenv(tmpnew);
1625 if (ret) {
1626 ret = -errno;
1627 goto error;
1628 }
1629 }
94c55f17 1630 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1631 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1632 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1633 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1634 NULL);
8f4905da
MD		 1635 if (consumerd64_libdir[0] != '\0') {
1636 free(tmpnew);
1637 }
1638 if (ret) {
1639 goto error;
1640 }
3bd1e081 1641 break;
7753dea8
MD		 1642 }
1643 case LTTNG_CONSUMER32_UST:
1644 {
937dde8e 1645 char *tmpnew = NULL;
8f4905da
MD		 1646
1647 if (consumerd32_libdir[0] != '\0') {
1648 char *tmp;
1649 size_t tmplen;
1650
1651 tmp = getenv("LD_LIBRARY_PATH");
1652 if (!tmp) {
1653 tmp = "";
1654 }
1655 tmplen = strlen("LD_LIBRARY_PATH=")
1656 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1657 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1658 if (!tmpnew) {
1659 ret = -ENOMEM;
1660 goto error;
1661 }
1662 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1663 strcat(tmpnew, consumerd32_libdir);
1664 if (tmp[0] != '\0') {
1665 strcat(tmpnew, ":");
1666 strcat(tmpnew, tmp);
1667 }
1668 ret = putenv(tmpnew);
1669 if (ret) {
1670 ret = -errno;
1671 goto error;
1672 }
1673 }
94c55f17 1674 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1675 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1676 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1677 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1678 NULL);
8f4905da
MD		 1679 if (consumerd32_libdir[0] != '\0') {
1680 free(tmpnew);
1681 }
1682 if (ret) {
1683 goto error;
1684 }
3bd1e081 1685 break;
7753dea8 1686 }
3bd1e081
MD		 1687 default:
1688 perror("unknown consumer type");
1689 exit(EXIT_FAILURE);
1690 }
8c0faa1d
DG		 1691 if (errno != 0) {
1692 perror("kernel start consumer exec");
1693 }
1694 exit(EXIT_FAILURE);
1695 } else if (pid > 0) {
1696 ret = pid;
8c0faa1d 1697 } else {
3bd1e081 1698 perror("start consumer fork");
8c0faa1d 1699 ret = -errno;
8c0faa1d 1700 }
8f4905da 1701error:
8c0faa1d
DG		 1702 return ret;
1703}
1704
693bd40b 1705/*
3bd1e081 1706 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1707 */
3bd1e081 1708static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1709{
1710 int ret;
1711
3bd1e081
MD		 1712 pthread_mutex_lock(&consumer_data->pid_mutex);
1713 if (consumer_data->pid != 0) {
1714 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1715 goto end;
1716 }
693bd40b 1717
3bd1e081 1718 ret = spawn_consumerd(consumer_data);
c49dc785 1719 if (ret < 0) {
3bd1e081
MD		 1720 ERR("Spawning consumerd failed");
1721 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1722 goto error;
693bd40b 1723 }
c49dc785 1724
3bd1e081
MD		 1725 /* Setting up the consumer_data pid */
1726 consumer_data->pid = ret;
48842b30 1727 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1728 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1729
3bd1e081
MD		 1730 DBG2("Spawning consumer control thread");
1731 ret = spawn_consumer_thread(consumer_data);
693bd40b 1732 if (ret < 0) {
3bd1e081 1733 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1734 goto error;
1735 }
1736
c49dc785 1737end:
693bd40b
DG		 1738 return 0;
1739
1740error:
1741 return ret;
1742}
1743
b73401da 1744/*
096102bd 1745 * Check version of the lttng-modules.
b73401da 1746 */
096102bd 1747static int validate_lttng_modules_version(void)
b73401da 1748{
096102bd 1749 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD		 1750}
1751
b73401da 1752/*
096102bd 1753 * Setup necessary data for kernel tracer action.
b73401da 1754 */
096102bd 1755static int init_kernel_tracer(void)
b73401da
DG		 1756{
1757 int ret;
b73401da 1758
096102bd
DG		 1759 /* Modprobe lttng kernel modules */
1760 ret = modprobe_lttng_control();
b73401da 1761 if (ret < 0) {
b73401da
DG		 1762 goto error;
1763 }
1764
096102bd
DG		 1765 /* Open debugfs lttng */
1766 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1767 if (kernel_tracer_fd < 0) {
1768 DBG("Failed to open %s", module_proc_lttng);
1769 ret = -1;
1770 goto error_open;
b73401da
DG		 1771 }
1772
096102bd
DG		 1773 /* Validate kernel version */
1774 ret = validate_lttng_modules_version();
b73401da 1775 if (ret < 0) {
096102bd 1776 goto error_version;
b73401da
DG		 1777 }
1778
096102bd 1779 ret = modprobe_lttng_data();
b73401da 1780 if (ret < 0) {
096102bd 1781 goto error_modules;
b73401da
DG		 1782 }
1783
f3ed775e 1784 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG		 1785 return 0;
1786
1787error_version:
1788 modprobe_remove_lttng_control();
1789 close(kernel_tracer_fd);
1790 kernel_tracer_fd = 0;
1791 return LTTCOMM_KERN_VERSION;
1792
1793error_modules:
1794 close(kernel_tracer_fd);
1795
1796error_open:
1797 modprobe_remove_lttng_control();
b73401da
DG		 1798
1799error:
b73401da
DG		 1800 WARN("No kernel tracer available");
1801 kernel_tracer_fd = 0;
096102bd 1802 return LTTCOMM_KERN_NA;
f3ed775e 1803}
33a2b854 1804
f3ed775e 1805/*
54d01ffb 1806 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1807 */
54d01ffb 1808static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1809{
f40799e8 1810 int ret = 0;
8c0faa1d 1811
3bd1e081 1812 if (session->consumer_fds_sent == 0) {
d9800920 1813 /*
54d01ffb
DG		 1814 * Assign default kernel consumer socket if no consumer assigned to the
1815 * kernel session. At this point, it's NOT suppose to be 0 but this is
1816 * an extra security check.
d9800920
DG		 1817 */
1818 if (session->consumer_fd == 0) {
3bd1e081 1819 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1820 }
1821
2bdd86d4 1822 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1823 if (ret < 0) {
f3ed775e
DG		 1824 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1825 goto error;
1826 }
1d4b027a 1827
3bd1e081 1828 session->consumer_fds_sent = 1;
f3ed775e 1829 }
1d4b027a
DG		 1830
1831error:
1832 return ret;
8c0faa1d
DG		 1833}
1834
0177d773
DG		 1835/*
1836 * Create an UST session and add it to the session ust list.
1837 */
44d3bd01
DG		 1838static int create_ust_session(struct ltt_session *session,
1839 struct lttng_domain *domain)
0177d773 1840{
13384287 1841 struct ltt_ust_session *lus = NULL;
6df2e2c9 1842 int ret;
44d3bd01
DG		 1843
1844 switch (domain->type) {
48842b30 1845 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1846 break;
1847 default:
13384287 1848 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1849 goto error;
1850 }
0177d773
DG		 1851
1852 DBG("Creating UST session");
1853
a991f516 1854 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1855 if (lus == NULL) {
44d3bd01 1856 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1857 goto error;
1858 }
1859
e11d277b 1860 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1861 session->uid, session->gid);
0177d773
DG		 1862 if (ret < 0) {
1863 if (ret != -EEXIST) {
1864 ERR("Trace directory creation error");
44d3bd01 1865 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1866 goto error;
1867 }
1868 }
1869
f6a9efaa
DG		 1870 /* The domain type dictate different actions on session creation */
1871 switch (domain->type) {
48842b30
DG		 1872 case LTTNG_DOMAIN_UST:
1873 /* No ustctl for the global UST domain */
1874 break;
1875 default:
36dc12cc 1876 ERR("Unknown UST domain on create session %d", domain->type);
0177d773
DG		 1877 goto error;
1878 }
6df2e2c9
MD		 1879 lus->uid = session->uid;
1880 lus->gid = session->gid;
f6a9efaa 1881 session->ust_session = lus;
44d3bd01
DG		 1882
1883 return LTTCOMM_OK;
0177d773
DG		 1884
1885error:
1886 free(lus);
1887 return ret;
1888}
1889
333f285e 1890/*
d063d709 1891 * Create a kernel tracer session then create the default channel.
333f285e 1892 */
f3ed775e 1893static int create_kernel_session(struct ltt_session *session)
333f285e 1894{
f3ed775e 1895 int ret;
f3ed775e
DG		 1896
1897 DBG("Creating kernel session");
1898
1899 ret = kernel_create_session(session, kernel_tracer_fd);
1900 if (ret < 0) {
1901 ret = LTTCOMM_KERN_SESS_FAIL;
1902 goto error;
333f285e
DG		 1903 }
1904
d9800920 1905 /* Set kernel consumer socket fd */
3bd1e081
MD		 1906 if (kconsumer_data.cmd_sock) {
1907 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1908 }
1909
e11d277b 1910 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1911 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1912 if (ret < 0) {
996b65c8 1913 if (ret != -EEXIST) {
7a485870
DG		 1914 ERR("Trace directory creation error");
1915 goto error;
1916 }
1917 }
6df2e2c9
MD		 1918 session->kernel_session->uid = session->uid;
1919 session->kernel_session->gid = session->gid;
7a485870 1920
f3ed775e
DG		 1921error:
1922 return ret;
333f285e
DG		 1923}
1924
8e0af1b4 1925/*
c7704d57
DG		 1926 * Check if the UID or GID match the session. Root user has access to all
1927 * sessions.
8e0af1b4 1928 */
c7704d57 1929static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1930{
c7704d57 1931 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD		 1932 return 0;
1933 } else {
1934 return 1;
1935 }
1936}
1937
1938static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1939{
1940 unsigned int i = 0;
1941 struct ltt_session *session;
1942
1943 DBG("Counting number of available session for UID %d GID %d",
1944 uid, gid);
1945 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1946 /*
1947 * Only list the sessions the user can control.
1948 */
1949 if (!session_access_ok(session, uid, gid)) {
1950 continue;
1951 }
1952 i++;
1953 }
1954 return i;
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 1963 */
c7704d57
DG		 1964static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1965 gid_t gid)
6c9cc2ab 1966{
8e0af1b4 1967 unsigned int i = 0;
6c9cc2ab
DG		 1968 struct ltt_session *session;
1969
8e0af1b4
MD		 1970 DBG("Getting all available session for UID %d GID %d",
1971 uid, gid);
6c9cc2ab
DG		 1972 /*
1973 * Iterate over session list and append data after the control struct in
1974 * the buffer.
1975 */
1976 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD		 1977 /*
1978 * Only list the sessions the user can control.
1979 */
1980 if (!session_access_ok(session, uid, gid)) {
1981 continue;
1982 }
6c9cc2ab 1983 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1984 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1985 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1986 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1987 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1988 i++;
1989 }
1990}
1991
9f19cc17
DG		 1992/*
1993 * Fill lttng_channel array of all channels.
1994 */
b551a063 1995static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1996 struct lttng_channel *channels)
1997{
1998 int i = 0;
1999 struct ltt_kernel_channel *kchan;
2000
2001 DBG("Listing channels for session %s", session->name);
2002
b551a063
DG		 2003 switch (domain) {
2004 case LTTNG_DOMAIN_KERNEL:
2005 /* Kernel channels */
2006 if (session->kernel_session != NULL) {
2007 cds_list_for_each_entry(kchan,
2008 &session->kernel_session->channel_list.head, list) {
2009 /* Copy lttng_channel struct to array */
2010 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2011 channels[i].enabled = kchan->enabled;
2012 i++;
2013 }
2014 }
2015 break;
2016 case LTTNG_DOMAIN_UST:
2017 {
bec39940 2018 struct lttng_ht_iter iter;
b551a063
DG		 2019 struct ltt_ust_channel *uchan;
2020
bec39940
DG		 2021 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2022 &iter.iter, uchan, node.node) {
b551a063
DG		 2023 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2024 channels[i].attr.overwrite = uchan->attr.overwrite;
2025 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2026 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2027 channels[i].attr.switch_timer_interval =
2028 uchan->attr.switch_timer_interval;
2029 channels[i].attr.read_timer_interval =
2030 uchan->attr.read_timer_interval;
aea829b3 2031 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2032 switch (uchan->attr.output) {
2033 case LTTNG_UST_MMAP:
2034 default:
2035 channels[i].attr.output = LTTNG_EVENT_MMAP;
2036 break;
2037 }
9f19cc17
DG		 2038 i++;
2039 }
b551a063
DG		 2040 break;
2041 }
2042 default:
2043 break;
9f19cc17 2044 }
b551a063 2045}
9f19cc17 2046
b551a063
DG		 2047/*
2048 * Create a list of ust global domain events.
2049 */
2050static int list_lttng_ust_global_events(char *channel_name,
2051 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2052{
2053 int i = 0, ret = 0;
2054 unsigned int nb_event = 0;
bec39940
DG		 2055 struct lttng_ht_iter iter;
2056 struct lttng_ht_node_str *node;
b551a063
DG		 2057 struct ltt_ust_channel *uchan;
2058 struct ltt_ust_event *uevent;
2059 struct lttng_event *tmp;
2060
2061 DBG("Listing UST global events for channel %s", channel_name);
2062
2063 rcu_read_lock();
2064
bec39940
DG		 2065 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2066 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG		 2067 if (node == NULL) {
2068 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2069 goto error;
b551a063
DG		 2070 }
2071
bec39940 2072 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2073
bec39940 2074 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2075
b551a063
DG		 2076 if (nb_event == 0) {
2077 ret = nb_event;
2078 goto error;
2079 }
2080
2081 DBG3("Listing UST global %d events", nb_event);
2082
2083 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2084 if (tmp == NULL) {
2085 ret = -LTTCOMM_FATAL;
2086 goto error;
2087 }
2088
bec39940 2089 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG		 2090 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2091 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2092 tmp[i].enabled = uevent->enabled;
2093 switch (uevent->attr.instrumentation) {
2094 case LTTNG_UST_TRACEPOINT:
2095 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2096 break;
2097 case LTTNG_UST_PROBE:
2098 tmp[i].type = LTTNG_EVENT_PROBE;
2099 break;
2100 case LTTNG_UST_FUNCTION:
2101 tmp[i].type = LTTNG_EVENT_FUNCTION;
2102 break;
0cda4f28 2103 }
8005f29a 2104 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2105 switch (uevent->attr.loglevel_type) {
8005f29a 2106 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2107 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2108 break;
8005f29a 2109 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2110 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD		 2111 break;
2112 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2113 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2114 break;
9f19cc17 2115 }
d7b75b30 2116 i++;
9f19cc17
DG		 2117 }
2118
b551a063
DG		 2119 ret = nb_event;
2120 *events = tmp;
2121
2122error:
2123 rcu_read_unlock();
2124 return ret;
9f19cc17
DG		 2125}
2126
2127/*
b551a063 2128 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2129 */
b551a063
DG		 2130static int list_lttng_kernel_events(char *channel_name,
2131 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2132{
b551a063
DG		 2133 int i = 0, ret;
2134 unsigned int nb_event;
9f19cc17 2135 struct ltt_kernel_event *event;
b551a063
DG		 2136 struct ltt_kernel_channel *kchan;
2137
2138 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2139 if (kchan == NULL) {
2140 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2141 goto error;
2142 }
2143
2144 nb_event = kchan->event_count;
9f19cc17
DG		 2145
2146 DBG("Listing events for channel %s", kchan->channel->name);
2147
b551a063
DG		 2148 if (nb_event == 0) {
2149 ret = nb_event;
2150 goto error;
2151 }
2152
2153 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2154 if (*events == NULL) {
2155 ret = LTTCOMM_FATAL;
2156 goto error;
2157 }
2158
9f19cc17
DG		 2159 /* Kernel channels */
2160 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2161 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2162 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2163 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2164 switch (event->event->instrumentation) {
2165 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2166 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2167 break;
2168 case LTTNG_KERNEL_KPROBE:
2169 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2170 (*events)[i].type = LTTNG_EVENT_PROBE;
2171 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2172 sizeof(struct lttng_kernel_kprobe));
2173 break;
2174 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2175 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2176 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2177 sizeof(struct lttng_kernel_function));
2178 break;
0133c199 2179 case LTTNG_KERNEL_NOOP:
b551a063 2180 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2181 break;
a54bd42d 2182 case LTTNG_KERNEL_SYSCALL:
b551a063 2183 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2184 break;
7a3d1328
MD		 2185 case LTTNG_KERNEL_ALL:
2186 assert(0);
2187 break;
9f19cc17
DG		 2188 }
2189 i++;
2190 }
b551a063
DG		 2191
2192 return nb_event;
2193
2194error:
2195 return ret;
9f19cc17
DG		 2196}
2197
fac6795d 2198/*
54d01ffb 2199 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2200 */
54d01ffb
DG		 2201static int cmd_disable_channel(struct ltt_session *session,
2202 int domain, char *channel_name)
fac6795d 2203{
54d01ffb 2204 int ret;
78f0bacd
DG		 2205 struct ltt_ust_session *usess;
2206
2207 usess = session->ust_session;
379473d2 2208
54d01ffb 2209 switch (domain) {
78f0bacd
DG		 2210 case LTTNG_DOMAIN_KERNEL:
2211 {
2212 ret = channel_kernel_disable(session->kernel_session,
2213 channel_name);
2214 if (ret != LTTCOMM_OK) {
2215 goto error;
2216 }
54d01ffb 2217
78f0bacd
DG		 2218 kernel_wait_quiescent(kernel_tracer_fd);
2219 break;
2220 }
2221 case LTTNG_DOMAIN_UST:
2222 {
2223 struct ltt_ust_channel *uchan;
bec39940 2224 struct lttng_ht *chan_ht;
78f0bacd 2225
7885e399
DG		 2226 chan_ht = usess->domain_global.channels;
2227
2228 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2229 if (uchan == NULL) {
2230 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2231 goto error;
78f0bacd
DG		 2232 }
2233
7885e399
DG		 2234 ret = channel_ust_disable(usess, domain, uchan);
2235 if (ret != LTTCOMM_OK) {
54d01ffb 2236 goto error;
78f0bacd 2237 }
78f0bacd
DG		 2238 break;
2239 }
d78d6610 2240#if 0
78f0bacd
DG		 2241 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2242 case LTTNG_DOMAIN_UST_EXEC_NAME:
2243 case LTTNG_DOMAIN_UST_PID:
d78d6610 2244#endif
78f0bacd
DG		 2245 default:
2246 ret = LTTCOMM_UNKNOWN_DOMAIN;
2247 goto error;
20fe2104
DG		 2248 }
2249
54d01ffb 2250 ret = LTTCOMM_OK;
d65106b1 2251
54d01ffb
DG		 2252error:
2253 return ret;
2254}
2255
2256/*
2257 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2258 */
44d3bd01 2259static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2260 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2261{
2262 int ret;
f6a9efaa 2263 struct ltt_ust_session *usess = session->ust_session;
bec39940 2264 struct lttng_ht *chan_ht;
f6a9efaa 2265
5d56b5aa 2266 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2267
aea829b3 2268 switch (domain) {
44d3bd01
DG		 2269 case LTTNG_DOMAIN_KERNEL:
2270 {
2271 struct ltt_kernel_channel *kchan;
54d01ffb 2272
44d3bd01
DG		 2273 kchan = trace_kernel_get_channel_by_name(attr->name,
2274 session->kernel_session);
2275 if (kchan == NULL) {
2276 ret = channel_kernel_create(session->kernel_session,
2277 attr, kernel_poll_pipe[1]);
2278 } else {
2279 ret = channel_kernel_enable(session->kernel_session, kchan);
2280 }
2281
2282 if (ret != LTTCOMM_OK) {
2283 goto error;
2284 }
2285
2286 kernel_wait_quiescent(kernel_tracer_fd);
2287 break;
2288 }
f6a9efaa
DG		 2289 case LTTNG_DOMAIN_UST:
2290 {
2291 struct ltt_ust_channel *uchan;
2292
7885e399 2293 chan_ht = usess->domain_global.channels;
f6a9efaa 2294
7885e399 2295 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2296 if (uchan == NULL) {
7885e399 2297 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2298 } else {
7885e399 2299 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2300 }
f6a9efaa
DG		 2301 break;
2302 }
d78d6610 2303#if 0
78f0bacd
DG		 2304 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2305 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2306 case LTTNG_DOMAIN_UST_PID:
d78d6610 2307#endif
44d3bd01
DG		 2308 default:
2309 ret = LTTCOMM_UNKNOWN_DOMAIN;
2310 goto error;
54d01ffb
DG		 2311 }
2312
54d01ffb
DG		 2313error:
2314 return ret;
2315}
2316
2317/*
2318 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2319 */
2320static int cmd_disable_event(struct ltt_session *session, int domain,
2321 char *channel_name, char *event_name)
2322{
2323 int ret;
54d01ffb
DG		 2324
2325 switch (domain) {
2326 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2327 {
2328 struct ltt_kernel_channel *kchan;
b0a40d28 2329 struct ltt_kernel_session *ksess;
2bdd86d4 2330
b0a40d28
DG		 2331 ksess = session->kernel_session;
2332
2333 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2334 if (kchan == NULL) {
2335 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2336 goto error;
d65106b1
DG		 2337 }
2338
b0a40d28 2339 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2340 if (ret != LTTCOMM_OK) {
2341 goto error;
2342 }
2343
2344 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2345 break;
2bdd86d4
MD		 2346 }
2347 case LTTNG_DOMAIN_UST:
b0a40d28 2348 {
b0a40d28 2349 struct ltt_ust_channel *uchan;
7f79d3a1 2350 struct ltt_ust_session *usess;
b0a40d28
DG		 2351
2352 usess = session->ust_session;
2353
2354 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2355 channel_name);
2356 if (uchan == NULL) {
2357 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2358 goto error;
2359 }
2360
7f79d3a1
DG		 2361 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2362 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2363 goto error;
2364 }
2365
7f79d3a1 2366 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2367 channel_name);
b0a40d28
DG		 2368 break;
2369 }
d78d6610 2370#if 0
2bdd86d4
MD		 2371 case LTTNG_DOMAIN_UST_EXEC_NAME:
2372 case LTTNG_DOMAIN_UST_PID:
2373 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2374#endif
54d01ffb 2375 default:
1ab1ea0b 2376 ret = LTTCOMM_UND;
54d01ffb 2377 goto error;
d65106b1 2378 }
26cc6b4e 2379
54d01ffb
DG		 2380 ret = LTTCOMM_OK;
2381
2382error:
2383 return ret;
2384}
2385
2386/*
2387 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2388 */
2389static int cmd_disable_event_all(struct ltt_session *session, int domain,
2390 char *channel_name)
2391{
2392 int ret;
54d01ffb
DG		 2393
2394 switch (domain) {
2395 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2396 {
2397 struct ltt_kernel_session *ksess;
2398 struct ltt_kernel_channel *kchan;
2399
2400 ksess = session->kernel_session;
2401
2402 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2403 if (kchan == NULL) {
2404 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2405 goto error;
26cc6b4e
DG		 2406 }
2407
9730260e 2408 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2409 if (ret != LTTCOMM_OK) {
0b97ec54 2410 goto error;
26cc6b4e
DG		 2411 }
2412
54d01ffb 2413 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2414 break;
9730260e
DG		 2415 }
2416 case LTTNG_DOMAIN_UST:
2417 {
2418 struct ltt_ust_session *usess;
2419 struct ltt_ust_channel *uchan;
2420
2421 usess = session->ust_session;
2422
2423 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2424 channel_name);
2425 if (uchan == NULL) {
2426 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2427 goto error;
2428 }
2429
7f79d3a1
DG		 2430 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2431 if (ret != 0) {
9730260e
DG		 2432 goto error;
2433 }
2434
7f79d3a1 2435 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2436
2437 break;
2438 }
d78d6610 2439#if 0
9730260e
DG		 2440 case LTTNG_DOMAIN_UST_EXEC_NAME:
2441 case LTTNG_DOMAIN_UST_PID:
2442 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2443#endif
54d01ffb 2444 default:
1ab1ea0b 2445 ret = LTTCOMM_UND;
54d01ffb 2446 goto error;
26cc6b4e 2447 }
e953ef25 2448
54d01ffb 2449 ret = LTTCOMM_OK;
e953ef25 2450
54d01ffb
DG		 2451error:
2452 return ret;
2453}
f5177a38 2454
54d01ffb
DG		 2455/*
2456 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2457 */
2458static int cmd_add_context(struct ltt_session *session, int domain,
2459 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2460{
2461 int ret;
f5177a38 2462
54d01ffb
DG		 2463 switch (domain) {
2464 case LTTNG_DOMAIN_KERNEL:
2465 /* Add kernel context to kernel tracer */
2466 ret = context_kernel_add(session->kernel_session, ctx,
2467 event_name, channel_name);
2468 if (ret != LTTCOMM_OK) {
f5177a38 2469 goto error;
e953ef25 2470 }
2bdd86d4
MD		 2471 break;
2472 case LTTNG_DOMAIN_UST:
2473 {
55cc08a6 2474 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2475
55cc08a6
DG		 2476 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2477 if (ret != LTTCOMM_OK) {
2478 goto error;
2bdd86d4 2479 }
e953ef25 2480 break;
2bdd86d4 2481 }
d78d6610 2482#if 0
55cc08a6
DG		 2483 case LTTNG_DOMAIN_UST_EXEC_NAME:
2484 case LTTNG_DOMAIN_UST_PID:
2485 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2486#endif
54d01ffb 2487 default:
1ab1ea0b 2488 ret = LTTCOMM_UND;
54d01ffb 2489 goto error;
e953ef25 2490 }
950131af 2491
54d01ffb 2492 ret = LTTCOMM_OK;
950131af 2493
54d01ffb
DG		 2494error:
2495 return ret;
2496}
2497
2498/*
2499 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2500 */
2501static int cmd_enable_event(struct ltt_session *session, int domain,
2502 char *channel_name, struct lttng_event *event)
2503{
2504 int ret;
f6cd6b0f 2505 struct lttng_channel *attr;
48842b30 2506 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2507
2508 switch (domain) {
2509 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2510 {
2511 struct ltt_kernel_channel *kchan;
2512
54d01ffb
DG		 2513 kchan = trace_kernel_get_channel_by_name(channel_name,
2514 session->kernel_session);
2515 if (kchan == NULL) {
f6cd6b0f
DG		 2516 attr = channel_new_default_attr(domain);
2517 if (attr == NULL) {
2518 ret = LTTCOMM_FATAL;
2519 goto error;
2520 }
2521 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2522
54d01ffb 2523 /* This call will notify the kernel thread */
44d3bd01 2524 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2525 attr, kernel_poll_pipe[1]);
54d01ffb 2526 if (ret != LTTCOMM_OK) {
ff4d74e6 2527 free(attr);
f5177a38
DG		 2528 goto error;
2529 }
ff4d74e6 2530 free(attr);
54d01ffb 2531 }
950131af 2532
54d01ffb
DG		 2533 /* Get the newly created kernel channel pointer */
2534 kchan = trace_kernel_get_channel_by_name(channel_name,
2535 session->kernel_session);
2536 if (kchan == NULL) {
2537 /* This sould not happen... */
2538 ret = LTTCOMM_FATAL;
2539 goto error;
2540 }
f5177a38 2541
48842b30
DG		 2542 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2543 event);
54d01ffb 2544 if (ret != LTTCOMM_OK) {
f5177a38 2545 goto error;
950131af
DG		 2546 }
2547
54d01ffb 2548 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2549 break;
2bdd86d4
MD		 2550 }
2551 case LTTNG_DOMAIN_UST:
2552 {
aea829b3 2553 struct lttng_channel *attr;
48842b30 2554 struct ltt_ust_channel *uchan;
2bdd86d4 2555
edb67388 2556 /* Get channel from global UST domain */
48842b30
DG		 2557 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2558 channel_name);
2559 if (uchan == NULL) {
aea829b3
DG		 2560 /* Create default channel */
2561 attr = channel_new_default_attr(domain);
2562 if (attr == NULL) {
2563 ret = LTTCOMM_FATAL;
2564 goto error;
2565 }
596219f7 2566 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2567 attr->name[NAME_MAX - 1] = '\0';
2bdd86d4 2568
7885e399 2569 ret = channel_ust_create(usess, domain, attr);
edb67388 2570 if (ret != LTTCOMM_OK) {
ff4d74e6 2571 free(attr);
aea829b3
DG		 2572 goto error;
2573 }
aea829b3
DG		 2574 free(attr);
2575
2576 /* Get the newly created channel reference back */
2577 uchan = trace_ust_find_channel_by_name(
2578 usess->domain_global.channels, channel_name);
2579 if (uchan == NULL) {
2580 /* Something is really wrong */
2bdd86d4
MD		 2581 ret = LTTCOMM_FATAL;
2582 goto error;
2583 }
48842b30 2584 }
2bdd86d4 2585
edb67388 2586 /* At this point, the session and channel exist on the tracer */
edb67388
DG		 2587 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2588 if (ret != LTTCOMM_OK) {
48842b30 2589 goto error;
2bdd86d4
MD		 2590 }
2591 break;
2592 }
d78d6610 2593#if 0
2bdd86d4
MD		 2594 case LTTNG_DOMAIN_UST_EXEC_NAME:
2595 case LTTNG_DOMAIN_UST_PID:
2596 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2597#endif
54d01ffb 2598 default:
1ab1ea0b 2599 ret = LTTCOMM_UND;
54d01ffb 2600 goto error;
950131af 2601 }
d36b8583 2602
54d01ffb 2603 ret = LTTCOMM_OK;
d36b8583 2604
54d01ffb
DG		 2605error:
2606 return ret;
2607}
7d29a247 2608
54d01ffb
DG		 2609/*
2610 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2611 */
2612static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2613 char *channel_name, int event_type)
54d01ffb
DG		 2614{
2615 int ret;
2616 struct ltt_kernel_channel *kchan;
7d29a247 2617
54d01ffb
DG		 2618 switch (domain) {
2619 case LTTNG_DOMAIN_KERNEL:
2620 kchan = trace_kernel_get_channel_by_name(channel_name,
2621 session->kernel_session);
2622 if (kchan == NULL) {
2623 /* This call will notify the kernel thread */
44d3bd01
DG		 2624 ret = channel_kernel_create(session->kernel_session, NULL,
2625 kernel_poll_pipe[1]);
54d01ffb
DG		 2626 if (ret != LTTCOMM_OK) {
2627 goto error;
d36b8583 2628 }
0d0c377a 2629
8f69e5eb
DG		 2630 /* Get the newly created kernel channel pointer */
2631 kchan = trace_kernel_get_channel_by_name(channel_name,
2632 session->kernel_session);
2633 if (kchan == NULL) {
2634 /* This sould not happen... */
2635 ret = LTTCOMM_FATAL;
2636 goto error;
2637 }
2638
54d01ffb 2639 }
0fdd1e2c 2640
7a3d1328 2641 switch (event_type) {
76d45b40 2642 case LTTNG_EVENT_SYSCALL:
7a3d1328 2643 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2644 kchan, kernel_tracer_fd);
7a3d1328 2645 break;
76d45b40 2646 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2647 /*
7a3d1328
MD		 2648 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2649 * events already registered to the channel.
8c9ae521 2650 */
7a3d1328
MD		 2651 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2652 kchan, kernel_tracer_fd);
2653 break;
76d45b40 2654 case LTTNG_EVENT_ALL:
7a3d1328 2655 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2656 ret = event_kernel_enable_all(session->kernel_session,
2657 kchan, kernel_tracer_fd);
7a3d1328
MD		 2658 break;
2659 default:
2660 ret = LTTCOMM_KERN_ENABLE_FAIL;
2661 goto error;
8c9ae521 2662 }
8f69e5eb
DG		 2663
2664 /* Manage return value */
54d01ffb 2665 if (ret != LTTCOMM_OK) {
0d0c377a 2666 goto error;
d36b8583
DG		 2667 }
2668
54d01ffb 2669 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2670 break;
76d45b40
DG		 2671 case LTTNG_DOMAIN_UST:
2672 {
2673 struct lttng_channel *attr;
2674 struct ltt_ust_channel *uchan;
2675 struct ltt_ust_session *usess = session->ust_session;
2676
2677 /* Get channel from global UST domain */
2678 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2679 channel_name);
2680 if (uchan == NULL) {
2681 /* Create default channel */
2682 attr = channel_new_default_attr(domain);
2683 if (attr == NULL) {
2684 ret = LTTCOMM_FATAL;
2685 goto error;
2686 }
2687 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2688 attr->name[NAME_MAX - 1] = '\0';
2689
2690 /* Use the internal command enable channel */
7885e399 2691 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2692 if (ret != LTTCOMM_OK) {
2693 free(attr);
2694 goto error;
2695 }
2696 free(attr);
2697
2698 /* Get the newly created channel reference back */
2699 uchan = trace_ust_find_channel_by_name(
2700 usess->domain_global.channels, channel_name);
2701 if (uchan == NULL) {
2702 /* Something is really wrong */
2703 ret = LTTCOMM_FATAL;
2704 goto error;
2705 }
2706 }
2707
2708 /* At this point, the session and channel exist on the tracer */
2709
2710 switch (event_type) {
2711 case LTTNG_EVENT_ALL:
2712 case LTTNG_EVENT_TRACEPOINT:
2713 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2714 if (ret != LTTCOMM_OK) {
2715 goto error;
2716 }
2717 break;
2718 default:
2719 ret = LTTCOMM_UST_ENABLE_FAIL;
2720 goto error;
2721 }
2722
2723 /* Manage return value */
2724 if (ret != LTTCOMM_OK) {
2725 goto error;
2726 }
2727
2728 break;
2729 }
d78d6610 2730#if 0
76d45b40
DG		 2731 case LTTNG_DOMAIN_UST_EXEC_NAME:
2732 case LTTNG_DOMAIN_UST_PID:
2733 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2734#endif
54d01ffb 2735 default:
1ab1ea0b 2736 ret = LTTCOMM_UND;
54d01ffb 2737 goto error;
d36b8583 2738 }
f3ed775e 2739
54d01ffb
DG		 2740 ret = LTTCOMM_OK;
2741
2742error:
2743 return ret;
2744}
2745
2746/*
2747 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2748 */
2749static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2750{
2751 int ret;
2752 ssize_t nb_events = 0;
2753
2754 switch (domain) {
2755 case LTTNG_DOMAIN_KERNEL:
2756 nb_events = kernel_list_events(kernel_tracer_fd, events);
2757 if (nb_events < 0) {
2758 ret = LTTCOMM_KERN_LIST_FAIL;
2759 goto error;
894be886 2760 }
54d01ffb 2761 break;
b551a063
DG		 2762 case LTTNG_DOMAIN_UST:
2763 nb_events = ust_app_list_events(events);
2764 if (nb_events < 0) {
2765 ret = LTTCOMM_UST_LIST_FAIL;
2766 goto error;
2767 }
2768 break;
54d01ffb 2769 default:
1ab1ea0b 2770 ret = LTTCOMM_UND;
54d01ffb
DG		 2771 goto error;
2772 }
894be886 2773
54d01ffb 2774 return nb_events;
7d29a247 2775
54d01ffb
DG		 2776error:
2777 /* Return negative value to differentiate return code */
2778 return -ret;
2779}
b389abbe 2780
54d01ffb
DG		 2781/*
2782 * Command LTTNG_START_TRACE processed by the client thread.
2783 */
2784static int cmd_start_trace(struct ltt_session *session)
2785{
2786 int ret;
54d01ffb 2787 struct ltt_kernel_session *ksession;
b9d9b220 2788 struct ltt_ust_session *usess;
b389abbe 2789
54d01ffb
DG		 2790 /* Short cut */
2791 ksession = session->kernel_session;
b9d9b220 2792 usess = session->ust_session;
5eb91c98 2793
b9ef1c83
DG		 2794 if (session->enabled) {
2795 ret = LTTCOMM_UST_START_FAIL;
2796 goto error;
2797 }
2798
464dd62d 2799 session->enabled = 1;
5eb91c98 2800
54d01ffb
DG		 2801 /* Kernel tracing */
2802 if (ksession != NULL) {
2bdd86d4
MD		 2803 struct ltt_kernel_channel *kchan;
2804
54d01ffb
DG		 2805 /* Open kernel metadata */
2806 if (ksession->metadata == NULL) {
2807 ret = kernel_open_metadata(ksession, ksession->trace_path);
2808 if (ret < 0) {
2809 ret = LTTCOMM_KERN_META_FAIL;
2810 goto error;
b389abbe 2811 }
54d01ffb 2812 }
7d29a247 2813
54d01ffb
DG		 2814 /* Open kernel metadata stream */
2815 if (ksession->metadata_stream_fd == 0) {
2816 ret = kernel_open_metadata_stream(ksession);
2817 if (ret < 0) {
2818 ERR("Kernel create metadata stream failed");
2819 ret = LTTCOMM_KERN_STREAM_FAIL;
2820 goto error;
2821 }
2822 }
2823
2824 /* For each channel */
2825 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2826 if (kchan->stream_count == 0) {
2827 ret = kernel_open_channel_stream(kchan);
2828 if (ret < 0) {
2829 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2830 goto error;
2831 }
54d01ffb
DG		 2832 /* Update the stream global counter */
2833 ksession->stream_count_global += ret;
7d29a247 2834 }
54d01ffb
DG		 2835 }
2836
2837 /* Setup kernel consumer socket and send fds to it */
2838 ret = init_kernel_tracing(ksession);
2839 if (ret < 0) {
2840 ret = LTTCOMM_KERN_START_FAIL;
2841 goto error;
2842 }
2843
2844 /* This start the kernel tracing */
2845 ret = kernel_start_session(ksession);
2846 if (ret < 0) {
2847 ret = LTTCOMM_KERN_START_FAIL;
2848 goto error;
2849 }
2850
2851 /* Quiescent wait after starting trace */
2852 kernel_wait_quiescent(kernel_tracer_fd);
2853 }
2854
36dc12cc 2855 /* Flag session that trace should start automatically */
b9d9b220
DG		 2856 if (usess) {
2857 usess->start_trace = 1;
36dc12cc 2858
b9d9b220
DG		 2859 ret = ust_app_start_trace_all(usess);
2860 if (ret < 0) {
2861 ret = LTTCOMM_UST_START_FAIL;
2862 goto error;
2863 }
2bdd86d4 2864 }
54d01ffb
DG		 2865
2866 ret = LTTCOMM_OK;
2867
2868error:
2869 return ret;
2870}
2871
2872/*
2873 * Command LTTNG_STOP_TRACE processed by the client thread.
2874 */
2875static int cmd_stop_trace(struct ltt_session *session)
2876{
2877 int ret;
2878 struct ltt_kernel_channel *kchan;
2879 struct ltt_kernel_session *ksession;
8be98f9a 2880 struct ltt_ust_session *usess;
54d01ffb
DG		 2881
2882 /* Short cut */
2883 ksession = session->kernel_session;
8be98f9a 2884 usess = session->ust_session;
54d01ffb 2885
b9ef1c83 2886 if (!session->enabled) {
190df5ac 2887 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG		 2888 goto error;
2889 }
2890
464dd62d 2891 session->enabled = 0;
54d01ffb
DG		 2892
2893 /* Kernel tracer */
2894 if (ksession != NULL) {
2895 DBG("Stop kernel tracing");
2896
2897 /* Flush all buffers before stopping */
2898 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2899 if (ret < 0) {
2900 ERR("Kernel metadata flush failed");
2901 }
f34daff7 2902
54d01ffb
DG		 2903 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2904 ret = kernel_flush_buffer(kchan);
0d0c377a 2905 if (ret < 0) {
54d01ffb 2906 ERR("Kernel flush buffer error");
7d29a247 2907 }
54d01ffb 2908 }
19e70852 2909
54d01ffb
DG		 2910 ret = kernel_stop_session(ksession);
2911 if (ret < 0) {
2912 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2913 goto error;
f3ed775e 2914 }
54d01ffb
DG		 2915
2916 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2917 }
54d01ffb 2918
8be98f9a
MD		 2919 if (usess) {
2920 usess->start_trace = 0;
2bdd86d4 2921
8be98f9a 2922 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2923 if (ret < 0) {
190df5ac 2924 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD		 2925 goto error;
2926 }
2bdd86d4 2927 }
54d01ffb
DG		 2928
2929 ret = LTTCOMM_OK;
2930
2931error:
2932 return ret;
2933}
2934
2935/*
2936 * Command LTTNG_CREATE_SESSION processed by the client thread.
2937 */
6df2e2c9 2938static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG		 2939{
2940 int ret;
2941
6df2e2c9 2942 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG		 2943 if (ret != LTTCOMM_OK) {
2944 goto error;
2945 }
2946
2947 ret = LTTCOMM_OK;
2948
2949error:
2950 return ret;
2951}
2952
2953/*
2954 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2955 */
2956static int cmd_destroy_session(struct ltt_session *session, char *name)
2957{
2958 int ret;
2959
2960 /* Clean kernel session teardown */
2961 teardown_kernel_session(session);
84cd17c6
MD		 2962 /* UST session teardown */
2963 teardown_ust_session(session);
54d01ffb
DG		 2964
2965 /*
2966 * Must notify the kernel thread here to update it's poll setin order
2967 * to remove the channel(s)' fd just destroyed.
2968 */
2969 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2970 if (ret < 0) {
2971 perror("write kernel poll pipe");
2972 }
2973
271933a4 2974 ret = session_destroy(session);
54d01ffb
DG		 2975
2976 return ret;
2977}
2978
2979/*
2980 * Command LTTNG_CALIBRATE processed by the client thread.
2981 */
2982static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2983{
2984 int ret;
2985
2986 switch (domain) {
2987 case LTTNG_DOMAIN_KERNEL:
33a2b854 2988 {
54d01ffb 2989 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2990
54d01ffb
DG		 2991 kcalibrate.type = calibrate->type;
2992 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2993 if (ret < 0) {
54d01ffb
DG		 2994 ret = LTTCOMM_KERN_ENABLE_FAIL;
2995 goto error;
33a2b854 2996 }
54d01ffb
DG		 2997 break;
2998 }
4466912f
DG		 2999 case LTTNG_DOMAIN_UST:
3000 {
3001 struct lttng_ust_calibrate ucalibrate;
3002
3003 ucalibrate.type = calibrate->type;
3004 ret = ust_app_calibrate_glb(&ucalibrate);
3005 if (ret < 0) {
3006 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3007 goto error;
3008 }
3009 break;
3010 }
54d01ffb 3011 default:
1ab1ea0b 3012 ret = LTTCOMM_UND;
54d01ffb
DG		 3013 goto error;
3014 }
33a2b854 3015
54d01ffb 3016 ret = LTTCOMM_OK;
33a2b854 3017
54d01ffb
DG		 3018error:
3019 return ret;
3020}
7d29a247 3021
54d01ffb
DG		 3022/*
3023 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3024 */
3025static int cmd_register_consumer(struct ltt_session *session, int domain,
3026 char *sock_path)
3027{
3028 int ret, sock;
b389abbe 3029
54d01ffb
DG		 3030 switch (domain) {
3031 case LTTNG_DOMAIN_KERNEL:
3032 /* Can't register a consumer if there is already one */
48c4f28c 3033 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 3034 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3035 goto error;
3036 }
3037
3038 sock = lttcomm_connect_unix_sock(sock_path);
3039 if (sock < 0) {
3040 ret = LTTCOMM_CONNECT_FAIL;
3041 goto error;
3042 }
3043
3044 session->kernel_session->consumer_fd = sock;
3045 break;
3046 default:
3047 /* TODO: Userspace tracing */
1ab1ea0b 3048 ret = LTTCOMM_UND;
54d01ffb
DG		 3049 goto error;
3050 }
3051
3052 ret = LTTCOMM_OK;
3053
3054error:
3055 return ret;
3056}
3057
3058/*
3059 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3060 */
3061static ssize_t cmd_list_domains(struct ltt_session *session,
3062 struct lttng_domain **domains)
3063{
b551a063 3064 int ret, index = 0;
54d01ffb
DG		 3065 ssize_t nb_dom = 0;
3066
3067 if (session->kernel_session != NULL) {
b551a063 3068 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3069 nb_dom++;
3070 }
3071
b551a063
DG		 3072 if (session->ust_session != NULL) {
3073 DBG3("Listing domains found UST global domain");
3074 nb_dom++;
3075 }
54d01ffb 3076
b551a063 3077 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3078 if (*domains == NULL) {
3079 ret = -LTTCOMM_FATAL;
3080 goto error;
3081 }
3082
b551a063
DG		 3083 if (session->kernel_session != NULL) {
3084 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3085 index++;
3086 }
3087
3088 if (session->ust_session != NULL) {
3089 (*domains)[index].type = LTTNG_DOMAIN_UST;
3090 index++;
3091 }
54d01ffb 3092
54d01ffb
DG		 3093 return nb_dom;
3094
3095error:
3096 return ret;
3097}
3098
3099/*
3100 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3101 */
b551a063 3102static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3103 struct lttng_channel **channels)
3104{
3105 int ret;
3106 ssize_t nb_chan = 0;
3107
b551a063
DG		 3108 switch (domain) {
3109 case LTTNG_DOMAIN_KERNEL:
3110 if (session->kernel_session != NULL) {
3111 nb_chan = session->kernel_session->channel_count;
3112 }
0df502fd 3113 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3114 break;
3115 case LTTNG_DOMAIN_UST:
3116 if (session->ust_session != NULL) {
bec39940 3117 nb_chan = lttng_ht_get_count(
b551a063
DG		 3118 session->ust_session->domain_global.channels);
3119 }
0df502fd 3120 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3121 break;
3122 default:
3123 *channels = NULL;
1ab1ea0b 3124 ret = -LTTCOMM_UND;
54d01ffb
DG		 3125 goto error;
3126 }
3127
b551a063
DG		 3128 if (nb_chan > 0) {
3129 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3130 if (*channels == NULL) {
3131 ret = -LTTCOMM_FATAL;
3132 goto error;
3133 }
54d01ffb 3134
b551a063
DG		 3135 list_lttng_channels(domain, session, *channels);
3136 } else {
3137 *channels = NULL;
3138 }
2bdd86d4 3139
54d01ffb
DG		 3140 return nb_chan;
3141
3142error:
3143 return ret;
3144}
3145
3146/*
3147 * Command LTTNG_LIST_EVENTS processed by the client thread.
3148 */
b551a063 3149static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3150 char *channel_name, struct lttng_event **events)
3151{
b551a063 3152 int ret = 0;
54d01ffb 3153 ssize_t nb_event = 0;
54d01ffb 3154
b551a063
DG		 3155 switch (domain) {
3156 case LTTNG_DOMAIN_KERNEL:
3157 if (session->kernel_session != NULL) {
3158 nb_event = list_lttng_kernel_events(channel_name,
3159 session->kernel_session, events);
54d01ffb 3160 }
b551a063
DG		 3161 break;
3162 case LTTNG_DOMAIN_UST:
3163 {
3164 if (session->ust_session != NULL) {
3165 nb_event = list_lttng_ust_global_events(channel_name,
3166 &session->ust_session->domain_global, events);
54d01ffb 3167 }
b551a063 3168 break;
54d01ffb 3169 }
b551a063 3170 default:
1ab1ea0b 3171 ret = -LTTCOMM_UND;
54d01ffb
DG		 3172 goto error;
3173 }
3174
b551a063 3175 ret = nb_event;
54d01ffb
DG		 3176
3177error:
3178 return ret;
3179}
3180
3181/*
3182 * Process the command requested by the lttng client within the command
3183 * context structure. This function make sure that the return structure (llm)
3184 * is set and ready for transmission before returning.
3185 *
3186 * Return any error encountered or 0 for success.
3187 */
3188static int process_client_msg(struct command_ctx *cmd_ctx)
3189{
3190 int ret = LTTCOMM_OK;
44d3bd01 3191 int need_tracing_session = 1;
54d01ffb
DG		 3192
3193 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3194
4fba7219
DG		 3195 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3196 ret = LTTCOMM_KERN_NA;
3197 goto error;
3198 }
3199
54d01ffb
DG		 3200 /*
3201 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3202 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3203 * command.
3204 */
3205 switch(cmd_ctx->lsm->cmd_type) {
3206 case LTTNG_LIST_SESSIONS:
3207 case LTTNG_LIST_TRACEPOINTS:
3208 case LTTNG_LIST_DOMAINS:
3209 case LTTNG_LIST_CHANNELS:
3210 case LTTNG_LIST_EVENTS:
3211 break;
3212 default:
3213 /* Setup lttng message with no payload */
3214 ret = setup_lttng_msg(cmd_ctx, 0);
3215 if (ret < 0) {
3216 /* This label does not try to unlock the session */
3217 goto init_setup_error;
3218 }
3219 }
3220
3221 /* Commands that DO NOT need a session. */
3222 switch (cmd_ctx->lsm->cmd_type) {
3223 case LTTNG_CALIBRATE:
3224 case LTTNG_CREATE_SESSION:
3225 case LTTNG_LIST_SESSIONS:
3226 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3227 need_tracing_session = 0;
54d01ffb
DG		 3228 break;
3229 default:
3230 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3231 session_lock_list();
54d01ffb 3232 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3233 session_unlock_list();
54d01ffb
DG		 3234 if (cmd_ctx->session == NULL) {
3235 if (cmd_ctx->lsm->session.name != NULL) {
3236 ret = LTTCOMM_SESS_NOT_FOUND;
3237 } else {
3238 /* If no session name specified */
3239 ret = LTTCOMM_SELECT_SESS;
3240 }
3241 goto error;
3242 } else {
3243 /* Acquire lock for the session */
3244 session_lock(cmd_ctx->session);
3245 }
3246 break;
3247 }
b389abbe 3248
54d01ffb
DG		 3249 /*
3250 * Check domain type for specific "pre-action".
3251 */
3252 switch (cmd_ctx->lsm->domain.type) {
3253 case LTTNG_DOMAIN_KERNEL:
d1f1c568
DG		 3254 if (!is_root) {
3255 ret = LTTCOMM_KERN_NA;
3256 goto error;
3257 }
3258
54d01ffb
DG		 3259 /* Kernel tracer check */
3260 if (kernel_tracer_fd == 0) {
3261 /* Basically, load kernel tracer modules */
096102bd
DG		 3262 ret = init_kernel_tracer();
3263 if (ret != 0) {
54d01ffb
DG		 3264 goto error;
3265 }
3266 }
5eb91c98 3267
54d01ffb 3268 /* Need a session for kernel command */
44d3bd01 3269 if (need_tracing_session) {
54d01ffb
DG		 3270 if (cmd_ctx->session->kernel_session == NULL) {
3271 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3272 if (ret < 0) {
54d01ffb 3273 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3274 goto error;
3275 }
b389abbe 3276 }
7d29a247 3277
54d01ffb 3278 /* Start the kernel consumer daemon */
3bd1e081
MD		 3279 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3280 if (kconsumer_data.pid == 0 &&
54d01ffb 3281 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3282 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3283 ret = start_consumerd(&kconsumer_data);
7d29a247 3284 if (ret < 0) {
54d01ffb
DG		 3285 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3286 goto error;
950131af 3287 }
3ff2ecac
MD		 3288 } else {
3289 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3290 }
0d0c377a 3291 }
54d01ffb 3292 break;
2bdd86d4 3293 case LTTNG_DOMAIN_UST:
44d3bd01 3294 {
44d3bd01 3295 if (need_tracing_session) {
f6a9efaa 3296 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG		 3297 ret = create_ust_session(cmd_ctx->session,
3298 &cmd_ctx->lsm->domain);
3299 if (ret != LTTCOMM_OK) {
3300 goto error;
3301 }
3302 }
7753dea8
MD		 3303 /* Start the UST consumer daemons */
3304 /* 64-bit */
3305 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3306 if (consumerd64_bin[0] != '\0' &&
7753dea8 3307 ustconsumer64_data.pid == 0 &&
2bdd86d4 3308 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3309 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3310 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3311 if (ret < 0) {
7753dea8
MD		 3312 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3313 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3314 goto error;
3315 }
48842b30 3316
7753dea8 3317 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3318 } else {
7753dea8
MD		 3319 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3320 }
3321 /* 32-bit */
fc7a59ce 3322 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3323 ustconsumer32_data.pid == 0 &&
3324 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3325 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3326 ret = start_consumerd(&ustconsumer32_data);
3327 if (ret < 0) {
3328 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3329 ust_consumerd32_fd = -EINVAL;
3330 goto error;
3331 }
3332 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3333 } else {
3334 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3335 }
44d3bd01
DG		 3336 }
3337 break;
3338 }
54d01ffb 3339 default:
54d01ffb
DG		 3340 break;
3341 }
33a2b854 3342
8e0af1b4
MD		 3343 /*
3344 * Check that the UID or GID match that of the tracing session.
3345 * The root user can interact with all sessions.
3346 */
3347 if (need_tracing_session) {
3348 if (!session_access_ok(cmd_ctx->session,
3349 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3350 ret = LTTCOMM_EPERM;
3351 goto error;
3352 }
3353 }
3354
54d01ffb
DG		 3355 /* Process by command type */
3356 switch (cmd_ctx->lsm->cmd_type) {
3357 case LTTNG_ADD_CONTEXT:
3358 {
3359 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3360 cmd_ctx->lsm->u.context.channel_name,
3361 cmd_ctx->lsm->u.context.event_name,
3362 &cmd_ctx->lsm->u.context.ctx);
3363 break;
3364 }
3365 case LTTNG_DISABLE_CHANNEL:
3366 {
3367 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3368 cmd_ctx->lsm->u.disable.channel_name);
3369 break;
3370 }
3371 case LTTNG_DISABLE_EVENT:
3372 {
3373 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3374 cmd_ctx->lsm->u.disable.channel_name,
3375 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3376 break;
3377 }
54d01ffb
DG		 3378 case LTTNG_DISABLE_ALL_EVENT:
3379 {
2bdd86d4 3380 DBG("Disabling all events");
54d01ffb
DG		 3381
3382 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3383 cmd_ctx->lsm->u.disable.channel_name);
3384 break;
3385 }
3386 case LTTNG_ENABLE_CHANNEL:
3387 {
aea829b3 3388 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3389 &cmd_ctx->lsm->u.channel.chan);
3390 break;
3391 }
3392 case LTTNG_ENABLE_EVENT:
3393 {
3394 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3395 cmd_ctx->lsm->u.enable.channel_name,
3396 &cmd_ctx->lsm->u.enable.event);
3397 break;
3398 }
3399 case LTTNG_ENABLE_ALL_EVENT:
3400 {
2bdd86d4 3401 DBG("Enabling all events");
54d01ffb
DG		 3402
3403 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3404 cmd_ctx->lsm->u.enable.channel_name,
3405 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3406 break;
3407 }
052da939 3408 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3409 {
9f19cc17 3410 struct lttng_event *events;
54d01ffb 3411 ssize_t nb_events;
052da939 3412
54d01ffb
DG		 3413 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3414 if (nb_events < 0) {
3415 ret = -nb_events;
3416 goto error;
2ef84c95
DG		 3417 }
3418
3419 /*
3420 * Setup lttng message with payload size set to the event list size in
3421 * bytes and then copy list into the llm payload.
3422 */
052da939 3423 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3424 if (ret < 0) {
052da939 3425 free(events);
2ef84c95
DG		 3426 goto setup_error;
3427 }
3428
3429 /* Copy event list into message payload */
9f19cc17 3430 memcpy(cmd_ctx->llm->payload, events,
052da939 3431 sizeof(struct lttng_event) * nb_events);
2ef84c95 3432
9f19cc17 3433 free(events);
2ef84c95
DG		 3434
3435 ret = LTTCOMM_OK;
3436 break;
3437 }
f3ed775e 3438 case LTTNG_START_TRACE:
8c0faa1d 3439 {
54d01ffb 3440 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3441 break;
3442 }
f3ed775e 3443 case LTTNG_STOP_TRACE:
8c0faa1d 3444 {
54d01ffb 3445 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3446 break;
3447 }
5e16da05
MD		 3448 case LTTNG_CREATE_SESSION:
3449 {
3c6bae61 3450 tracepoint(create_session_start);
54d01ffb 3451 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3452 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3c6bae61 3453 tracepoint(create_session_end);
5e16da05
MD		 3454 break;
3455 }
3456 case LTTNG_DESTROY_SESSION:
3457 {
3c6bae61 3458 tracepoint(destroy_session_start);
54d01ffb
DG		 3459 ret = cmd_destroy_session(cmd_ctx->session,
3460 cmd_ctx->lsm->session.name);
3c6bae61 3461 tracepoint(destroy_session_end);
5461b305 3462 break;
5e16da05 3463 }
9f19cc17 3464 case LTTNG_LIST_DOMAINS:
5e16da05 3465 {
54d01ffb
DG		 3466 ssize_t nb_dom;
3467 struct lttng_domain *domains;
5461b305 3468
54d01ffb
DG		 3469 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3470 if (nb_dom < 0) {
3471 ret = -nb_dom;
3472 goto error;
ce3d728c 3473 }
520ff687 3474
54d01ffb 3475 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3476 if (ret < 0) {
3477 goto setup_error;
520ff687 3478 }
57167058 3479
54d01ffb
DG		 3480 /* Copy event list into message payload */
3481 memcpy(cmd_ctx->llm->payload, domains,
3482 nb_dom * sizeof(struct lttng_domain));
3483
3484 free(domains);
5e16da05 3485
5461b305 3486 ret = LTTCOMM_OK;
5e16da05
MD		 3487 break;
3488 }
9f19cc17 3489 case LTTNG_LIST_CHANNELS:
5e16da05 3490 {
54d01ffb
DG		 3491 size_t nb_chan;
3492 struct lttng_channel *channels;
3493
b551a063
DG		 3494 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3495 cmd_ctx->session, &channels);
54d01ffb
DG		 3496 if (nb_chan < 0) {
3497 ret = -nb_chan;
3498 goto error;
5461b305 3499 }
ca95a216 3500
54d01ffb 3501 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3502 if (ret < 0) {
3503 goto setup_error;
3504 }
9f19cc17 3505
54d01ffb
DG		 3506 /* Copy event list into message payload */
3507 memcpy(cmd_ctx->llm->payload, channels,
3508 nb_chan * sizeof(struct lttng_channel));
3509
3510 free(channels);
9f19cc17
DG		 3511
3512 ret = LTTCOMM_OK;
5461b305 3513 break;
5e16da05 3514 }
9f19cc17 3515 case LTTNG_LIST_EVENTS:
5e16da05 3516 {
b551a063 3517 ssize_t nb_event;
684d34d2 3518 struct lttng_event *events = NULL;
9f19cc17 3519
b551a063 3520 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3521 cmd_ctx->lsm->u.list.channel_name, &events);
3522 if (nb_event < 0) {
3523 ret = -nb_event;
3524 goto error;
5461b305 3525 }
ca95a216 3526
54d01ffb 3527 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3528 if (ret < 0) {
3529 goto setup_error;
3530 }
9f19cc17 3531
54d01ffb
DG		 3532 /* Copy event list into message payload */
3533 memcpy(cmd_ctx->llm->payload, events,
3534 nb_event * sizeof(struct lttng_event));
9f19cc17 3535
54d01ffb 3536 free(events);
9f19cc17
DG		 3537
3538 ret = LTTCOMM_OK;
5461b305 3539 break;
5e16da05
MD		 3540 }
3541 case LTTNG_LIST_SESSIONS:
3542 {
8e0af1b4 3543 unsigned int nr_sessions;
5461b305 3544
8e0af1b4
MD		 3545 session_lock_list();
3546 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
d32fb093 3547
8e0af1b4 3548 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3549 if (ret < 0) {
54d01ffb 3550 session_unlock_list();
5461b305 3551 goto setup_error;
e065084a 3552 }
5e16da05 3553
6c9cc2ab 3554 /* Filled the session array */
8e0af1b4
MD		 3555 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3556 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
6c9cc2ab 3557
54d01ffb 3558 session_unlock_list();
5e16da05 3559
5461b305 3560 ret = LTTCOMM_OK;
5e16da05
MD		 3561 break;
3562 }
d0254c7c
MD		 3563 case LTTNG_CALIBRATE:
3564 {
54d01ffb
DG		 3565 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3566 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3567 break;
3568 }
d9800920
DG		 3569 case LTTNG_REGISTER_CONSUMER:
3570 {
54d01ffb
DG		 3571 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3572 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3573 break;
3574 }
5e16da05 3575 default:
5e16da05 3576 ret = LTTCOMM_UND;
5461b305 3577 break;
fac6795d
DG		 3578 }
3579
5461b305 3580error:
5461b305
DG		 3581 if (cmd_ctx->llm == NULL) {
3582 DBG("Missing llm structure. Allocating one.");
894be886 3583 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3584 goto setup_error;
3585 }
3586 }
54d01ffb 3587 /* Set return code */
5461b305 3588 cmd_ctx->llm->ret_code = ret;
5461b305 3589setup_error:
b5541356 3590 if (cmd_ctx->session) {
54d01ffb 3591 session_unlock(cmd_ctx->session);
b5541356 3592 }
54d01ffb 3593init_setup_error:
8028d920 3594 return ret;
fac6795d
DG		 3595}
3596
1d4b027a 3597/*
d063d709
DG		 3598 * This thread manage all clients request using the unix client socket for
3599 * communication.
1d4b027a
DG		 3600 */
3601static void *thread_manage_clients(void *data)
3602{
5eb91c98
DG		 3603 int sock = 0, ret, i, pollfd;
3604 uint32_t revents, nb_fd;
273ea72c 3605 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3606 struct lttng_poll_event events;
1d4b027a 3607
b25a8868
DG		 3608 tracepoint(sessiond_th_cli_start);
3609
1d4b027a
DG		 3610 DBG("[thread] Manage client started");
3611
f6a9efaa
DG		 3612 rcu_register_thread();
3613
1d4b027a
DG		 3614 ret = lttcomm_listen_unix_sock(client_sock);
3615 if (ret < 0) {
3616 goto error;
3617 }
3618
5eb91c98
DG		 3619 /*
3620 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3621 * more will be added to this poll set.
3622 */
3623 ret = create_thread_poll_set(&events, 2);
3624 if (ret < 0) {
3625 goto error;
3626 }
273ea72c 3627
5eb91c98
DG		 3628 /* Add the application registration socket */
3629 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3630 if (ret < 0) {
3631 goto error;
3632 }
273ea72c 3633
bbd973c2
DG		 3634 /*
3635 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3636 */
3637 if (opt_sig_parent) {
8db8d1dc 3638 kill(ppid, SIGUSR1);
1d4b027a
DG		 3639 }
3640
3641 while (1) {
1d4b027a 3642 DBG("Accepting client command ...");
273ea72c 3643
b25a8868
DG		 3644 tracepoint(sessiond_th_cli_poll);
3645
5eb91c98
DG		 3646 nb_fd = LTTNG_POLL_GETNB(&events);
3647
273ea72c 3648 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3649 ret = lttng_poll_wait(&events, -1);
273ea72c 3650 if (ret < 0) {
273ea72c
DG		 3651 goto error;
3652 }
3653
5eb91c98
DG		 3654 for (i = 0; i < nb_fd; i++) {
3655 /* Fetch once the poll data */
3656 revents = LTTNG_POLL_GETEV(&events, i);
3657 pollfd = LTTNG_POLL_GETFD(&events, i);
3658
3659 /* Thread quit pipe has been closed. Killing thread. */
3660 ret = check_thread_quit_pipe(pollfd, revents);
3661 if (ret) {
3662 goto error;
3663 }
3664
3665 /* Event on the registration socket */
3666 if (pollfd == client_sock) {
3667 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3668 ERR("Client socket poll error");
3669 goto error;
3670 }
3671 }
273ea72c
DG		 3672 }
3673
5eb91c98
DG		 3674 DBG("Wait for client response");
3675
1d4b027a
DG		 3676 sock = lttcomm_accept_unix_sock(client_sock);
3677 if (sock < 0) {
3678 goto error;
3679 }
3680
be040666
DG		 3681 /* Set socket option for credentials retrieval */
3682 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3683 if (ret < 0) {
3684 goto error;
3685 }
3686
1d4b027a 3687 /* Allocate context command to process the client request */
ba7f0ae5 3688 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3689 if (cmd_ctx == NULL) {
ba7f0ae5 3690 perror("zmalloc cmd_ctx");
1d4b027a 3691 goto error;
5eb91c98 3692 }
1d4b027a
DG		 3693
3694 /* Allocate data buffer for reception */
ba7f0ae5 3695 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3696 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3697 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3698 goto error;
3699 }
1d4b027a 3700
1d4b027a
DG		 3701 cmd_ctx->llm = NULL;
3702 cmd_ctx->session = NULL;
3703
3704 /*
3705 * Data is received from the lttng client. The struct
3706 * lttcomm_session_msg (lsm) contains the command and data request of
3707 * the client.
3708 */
3709 DBG("Receiving data from client ...");
be040666
DG		 3710 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3711 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
1d4b027a 3712 if (ret <= 0) {
5eb91c98
DG		 3713 DBG("Nothing recv() from client... continuing");
3714 close(sock);
3715 free(cmd_ctx);
1d4b027a
DG		 3716 continue;
3717 }
3718
5eb91c98
DG		 3719 // TODO: Validate cmd_ctx including sanity check for
3720 // security purpose.
f7776ea7 3721
f6a9efaa 3722 rcu_thread_online();
1d4b027a
DG		 3723 /*
3724 * This function dispatch the work to the kernel or userspace tracer
3725 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3726 * informations for the client. The command context struct contains
3727 * everything this function may needs.
3728 */
3729 ret = process_client_msg(cmd_ctx);
f6a9efaa 3730 rcu_thread_offline();
1d4b027a 3731 if (ret < 0) {
bbd973c2 3732 /*
5eb91c98 3733 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3734 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3735 * (ENOMEM). Error detected but still accept command.
bbd973c2 3736 */
a2fb29a5 3737 clean_command_ctx(&cmd_ctx);
1d4b027a
DG		 3738 continue;
3739 }
3740
54d01ffb
DG		 3741 DBG("Sending response (size: %d, retcode: %s)",
3742 cmd_ctx->lttng_msg_size,
9a745bc7 3743 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3744 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
1d4b027a
DG		 3745 if (ret < 0) {
3746 ERR("Failed to send data back to client");
3747 }
3748
d6e4fca4
DG		 3749 /* End of transmission */
3750 close(sock);
be040666
DG		 3751
3752 clean_command_ctx(&cmd_ctx);
1d4b027a
DG		 3753 }
3754
3755error:
273ea72c 3756 DBG("Client thread dying");
273ea72c 3757 unlink(client_unix_sock_path);
5eb91c98
DG		 3758 close(client_sock);
3759 close(sock);
273ea72c 3760
5eb91c98 3761 lttng_poll_clean(&events);
a2fb29a5 3762 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3763
3764 rcu_unregister_thread();
1d4b027a
DG		 3765 return NULL;
3766}
3767
3768
fac6795d
DG		 3769/*
3770 * usage function on stderr
3771 */
3772static void usage(void)
3773{
b716ce68 3774 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3775 fprintf(stderr, " -h, --help Display this usage.\n");
3776 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3777 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3778 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3779 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3780 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3781 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3782 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3783 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3784 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3785 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3786 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3787 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3788 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3789 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3790 fprintf(stderr, " -V, --version Show version number.\n");
3791 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3792 fprintf(stderr, " -q, --quiet No output at all.\n");
3793 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3794 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3795 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3796}
3797
3798/*
3799 * daemon argument parsing
3800 */
3801static int parse_args(int argc, char **argv)
3802{
3803 int c;
3804
3805 static struct option long_options[] = {
3806 { "client-sock", 1, 0, 'c' },
3807 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3808 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3809 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3810 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3811 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3812 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3813 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3814 { "consumerd32-path", 1, 0, 'u' },
3815 { "consumerd32-libdir", 1, 0, 'U' },
3816 { "consumerd64-path", 1, 0, 't' },
3817 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3818 { "daemonize", 0, 0, 'd' },
5b8719f5 3819 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3820 { "help", 0, 0, 'h' },
3821 { "group", 1, 0, 'g' },
3822 { "version", 0, 0, 'V' },
75462a81 3823 { "quiet", 0, 0, 'q' },
3f9947db 3824 { "verbose", 0, 0, 'v' },
3bd1e081 3825 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3826 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3827 { NULL, 0, 0, 0 }
3828 };
3829
3830 while (1) {
3831 int option_index = 0;
4fba7219 3832 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3833 long_options, &option_index);
fac6795d
DG		 3834 if (c == -1) {
3835 break;
3836 }
3837
3838 switch (c) {
3839 case 0:
3840 fprintf(stderr, "option %s", long_options[option_index].name);
3841 if (optarg) {
3842 fprintf(stderr, " with arg %s\n", optarg);
3843 }
3844 break;
b716ce68 3845 case 'c':
fac6795d
DG		 3846 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3847 break;
3848 case 'a':
3849 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3850 break;
3851 case 'd':
3852 opt_daemon = 1;
3853 break;
3854 case 'g':
fb09408a 3855 opt_tracing_group = optarg;
fac6795d
DG		 3856 break;
3857 case 'h':
3858 usage();
3859 exit(EXIT_FAILURE);
3860 case 'V':
3861 fprintf(stdout, "%s\n", VERSION);
3862 exit(EXIT_SUCCESS);
5b8719f5
DG		 3863 case 'S':
3864 opt_sig_parent = 1;
3865 break;
d6f42150 3866 case 'E':
3bd1e081 3867 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3868 break;
3869 case 'C':
3bd1e081
MD		 3870 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3871 break;
3872 case 'F':
7753dea8 3873 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3874 break;
3875 case 'D':
7753dea8
MD		 3876 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3877 break;
3878 case 'H':
3879 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3880 break;
3881 case 'G':
3882 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3883 break;
4fba7219
DG		 3884 case 'N':
3885 opt_no_kernel = 1;
3886 break;
75462a81
DG		 3887 case 'q':
3888 opt_quiet = 1;
3889 break;
3f9947db 3890 case 'v':
53086306
DG		 3891 /* Verbose level can increase using multiple -v */
3892 opt_verbose += 1;
3f9947db 3893 break;
31f73cc9 3894 case 'Z':
3bd1e081 3895 opt_verbose_consumer += 1;
31f73cc9 3896 break;
fb09408a 3897 case 'u':
fc7a59ce 3898 consumerd32_bin= optarg;
ebaeda94
MD		 3899 break;
3900 case 'U':
3901 consumerd32_libdir = optarg;
7753dea8
MD		 3902 break;
3903 case 't':
fc7a59ce 3904 consumerd64_bin = optarg;
ebaeda94
MD		 3905 break;
3906 case 'T':
3907 consumerd64_libdir = optarg;
fb09408a 3908 break;
fac6795d
DG		 3909 default:
3910 /* Unknown option or other error.
3911 * Error is printed by getopt, just return */
3912 return -1;
3913 }
3914 }
3915
3916 return 0;
3917}
3918
3919/*
d063d709 3920 * Creates the two needed socket by the daemon.
d6f42150
DG		 3921 * apps_sock - The communication socket for all UST apps.
3922 * client_sock - The communication of the cli tool (lttng).
fac6795d 3923 */
cf3af59e 3924static int init_daemon_socket(void)
fac6795d
DG		 3925{
3926 int ret = 0;
3927 mode_t old_umask;
3928
3929 old_umask = umask(0);
3930
3931 /* Create client tool unix socket */
d6f42150
DG		 3932 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3933 if (client_sock < 0) {
3934 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3935 ret = -1;
3936 goto end;
3937 }
3938
3939 /* File permission MUST be 660 */
3940 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3941 if (ret < 0) {
d6f42150 3942 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3943 perror("chmod");
3944 goto end;
3945 }
3946
3947 /* Create the application unix socket */
d6f42150
DG		 3948 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3949 if (apps_sock < 0) {
3950 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3951 ret = -1;
3952 goto end;
3953 }
3954
d6f42150 3955 /* File permission MUST be 666 */
54d01ffb
DG		 3956 ret = chmod(apps_unix_sock_path,
3957 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3958 if (ret < 0) {
d6f42150 3959 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3960 perror("chmod");
3961 goto end;
3962 }
3963
3964end:
3965 umask(old_umask);
3966 return ret;
3967}
3968
3969/*
54d01ffb
DG		 3970 * Check if the global socket is available, and if a daemon is answering at the
3971 * other side. If yes, error is returned.
fac6795d 3972 */
cf3af59e 3973static int check_existing_daemon(void)
fac6795d 3974{
7d8234d9 3975 /* Is there anybody out there ? */
099e26bd 3976 if (lttng_session_daemon_alive()) {
7d8234d9 3977 return -EEXIST;
099e26bd 3978 }
b09c7c76
DG		 3979
3980 return 0;
fac6795d
DG		 3981}
3982
fac6795d 3983/*
d063d709 3984 * Set the tracing group gid onto the client socket.
5e16da05 3985 *
d063d709 3986 * Race window between mkdir and chown is OK because we are going from more
d1613cf5 3987 * permissive (root.root) to less permissive (root.tracing).
fac6795d 3988 */
be040666 3989static int set_permissions(char *rundir)
fac6795d
DG		 3990{
3991 int ret;
996b65c8 3992 gid_t gid;
fac6795d 3993
996b65c8
MD		 3994 gid = allowed_group();
3995 if (gid < 0) {
be040666
DG		 3996 WARN("No tracing group detected");
3997 ret = 0;
fac6795d
DG		 3998 goto end;
3999 }
4000
d6f42150 4001 /* Set lttng run dir */
be040666 4002 ret = chown(rundir, 0, gid);
d6f42150 4003 if (ret < 0) {
be040666 4004 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 4005 perror("chown");
4006 }
4007
d1613cf5
JN		 4008 /* Ensure tracing group can search the run dir */
4009 ret = chmod(rundir, S_IRWXU | S_IXGRP);
4010 if (ret < 0) {
4011 ERR("Unable to set permissions on %s", rundir);
4012 perror("chmod");
4013 }
4014
d6f42150 4015 /* lttng client socket path */
996b65c8 4016 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 4017 if (ret < 0) {
d6f42150
DG		 4018 ERR("Unable to set group on %s", client_unix_sock_path);
4019 perror("chown");
4020 }
4021
3bd1e081
MD		 4022 /* kconsumer error socket path */
4023 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 4024 if (ret < 0) {
3bd1e081
MD		 4025 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4026 perror("chown");
4027 }
4028
7753dea8
MD		 4029 /* 64-bit ustconsumer error socket path */
4030 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4031 if (ret < 0) {
4032 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4033 perror("chown");
4034 }
4035
4036 /* 32-bit ustconsumer compat32 error socket path */
4037 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 4038 if (ret < 0) {
7753dea8 4039 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 4040 perror("chown");
4041 }
4042
d6f42150 4043 DBG("All permissions are set");
e07ae692 4044
fac6795d
DG		 4045end:
4046 return ret;
4047}
4048
7a485870 4049/*
d063d709 4050 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 4051 */
4052static int create_kernel_poll_pipe(void)
4053{
4054 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4055}
4056
099e26bd
DG		 4057/*
4058 * Create the application command pipe to wake thread_manage_apps.
4059 */
4060static int create_apps_cmd_pipe(void)
4061{
4062 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4063}
4064
d6f42150 4065/*
d063d709 4066 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4067 */
67e40797 4068static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 4069{
4070 int ret;
4071
67e40797
DG		 4072 DBG3("Creating LTTng run directory: %s", rundir);
4073
d1613cf5 4074 ret = mkdir(rundir, S_IRWXU);
d6f42150 4075 if (ret < 0) {
b1f11e69 4076 if (errno != EEXIST) {
67e40797 4077 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4078 goto error;
4079 } else {
4080 ret = 0;
4081 }
d6f42150
DG		 4082 }
4083
4084error:
4085 return ret;
4086}
4087
4088/*
d063d709
DG		 4089 * Setup sockets and directory needed by the kconsumerd communication with the
4090 * session daemon.
d6f42150 4091 */
67e40797
DG		 4092static int set_consumer_sockets(struct consumer_data *consumer_data,
4093 const char *rundir)
d6f42150
DG		 4094{
4095 int ret;
67e40797 4096 char path[PATH_MAX];
d6f42150 4097
67e40797 4098 switch (consumer_data->type) {
7753dea8 4099 case LTTNG_CONSUMER_KERNEL:
60922cb0 4100 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD		 4101 break;
4102 case LTTNG_CONSUMER64_UST:
60922cb0 4103 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4104 break;
4105 case LTTNG_CONSUMER32_UST:
60922cb0 4106 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4107 break;
4108 default:
4109 ERR("Consumer type unknown");
4110 ret = -EINVAL;
4111 goto error;
d6f42150
DG		 4112 }
4113
67e40797
DG		 4114 DBG2("Creating consumer directory: %s", path);
4115
d1613cf5 4116 ret = mkdir(path, S_IRWXU);
d6f42150 4117 if (ret < 0) {
6beb2242 4118 if (errno != EEXIST) {
3bd1e081 4119 ERR("Failed to create %s", path);
6beb2242
DG		 4120 goto error;
4121 }
4122 ret = 0;
d6f42150
DG		 4123 }
4124
4125 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4126 consumer_data->err_sock =
4127 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4128 if (consumer_data->err_sock < 0) {
4129 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4130 ret = -1;
4131 goto error;
4132 }
4133
4134 /* File permission MUST be 660 */
3bd1e081 4135 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4136 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4137 if (ret < 0) {
3bd1e081 4138 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4139 PERROR("chmod");
d6f42150
DG		 4140 goto error;
4141 }
4142
4143error:
4144 return ret;
4145}
4146
fac6795d 4147/*
d063d709 4148 * Signal handler for the daemon
cf3af59e 4149 *
54d01ffb
DG		 4150 * Simply stop all worker threads, leaving main() return gracefully after
4151 * joining all threads and calling cleanup().
fac6795d
DG		 4152 */
4153static void sighandler(int sig)
4154{
4155 switch (sig) {
cf3af59e 4156 case SIGPIPE:
af87c45a 4157 DBG("SIGPIPE caught");
cf3af59e
MD		 4158 return;
4159 case SIGINT:
af87c45a 4160 DBG("SIGINT caught");
cf3af59e
MD		 4161 stop_threads();
4162 break;
4163 case SIGTERM:
af87c45a 4164 DBG("SIGTERM caught");
cf3af59e
MD		 4165 stop_threads();
4166 break;
4167 default:
4168 break;
fac6795d 4169 }
fac6795d
DG		 4170}
4171
4172/*
d063d709 4173 * Setup signal handler for :
1d4b027a 4174 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4175 */
1d4b027a 4176static int set_signal_handler(void)
fac6795d 4177{
1d4b027a
DG		 4178 int ret = 0;
4179 struct sigaction sa;
4180 sigset_t sigset;
fac6795d 4181
1d4b027a
DG		 4182 if ((ret = sigemptyset(&sigset)) < 0) {
4183 perror("sigemptyset");
4184 return ret;
4185 }
d6f42150 4186
1d4b027a
DG		 4187 sa.sa_handler = sighandler;
4188 sa.sa_mask = sigset;
4189 sa.sa_flags = 0;
4190 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4191 perror("sigaction");
4192 return ret;
d6f42150
DG		 4193 }
4194
1d4b027a
DG		 4195 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4196 perror("sigaction");
4197 return ret;
d6f42150 4198 }
aaf26714 4199
1d4b027a
DG		 4200 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4201 perror("sigaction");
4202 return ret;
8c0faa1d
DG		 4203 }
4204
1d4b027a
DG		 4205 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4206
4207 return ret;
fac6795d
DG		 4208}
4209
f3ed775e 4210/*
d063d709
DG		 4211 * Set open files limit to unlimited. This daemon can open a large number of
4212 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4213 */
4214static void set_ulimit(void)
4215{
4216 int ret;
4217 struct rlimit lim;
4218
a88df331 4219 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4220 lim.rlim_cur = 65535;
4221 lim.rlim_max = 65535;
4222
4223 ret = setrlimit(RLIMIT_NOFILE, &lim);
4224 if (ret < 0) {
4225 perror("failed to set open files limit");
4226 }
4227}
4228
fac6795d
DG		 4229/*
4230 * main
4231 */
4232int main(int argc, char **argv)
4233{
fac6795d
DG		 4234 int ret = 0;
4235 void *status;
b082db07 4236 const char *home_path;
fac6795d 4237
b25a8868 4238 tracepoint(sessiond_boot_start);
7bb1478a 4239
335a95b7
MD		 4240 init_kernel_workarounds();
4241
f6a9efaa 4242 rcu_register_thread();
b25a8868 4243
273ea72c 4244 /* Create thread quit pipe */
cf3af59e
MD		 4245 if ((ret = init_thread_quit_pipe()) < 0) {
4246 goto error;
273ea72c
DG		 4247 }
4248
7753dea8 4249 setup_consumerd_path();
fb09408a 4250
fac6795d
DG		 4251 /* Parse arguments */
4252 progname = argv[0];
4253 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4254 goto error;
fac6795d
DG		 4255 }
4256
4257 /* Daemonize */
4258 if (opt_daemon) {
53094c05
DG		 4259 ret = daemon(0, 0);
4260 if (ret < 0) {
4261 perror("daemon");
cf3af59e 4262 goto error;
53094c05 4263 }
fac6795d
DG		 4264 }
4265
4266 /* Check if daemon is UID = 0 */
4267 is_root = !getuid();
4268
fac6795d 4269 if (is_root) {
990570ed 4270 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG		 4271
4272 /* Create global run dir with root access */
4273 ret = create_lttng_rundir(rundir);
d6f42150 4274 if (ret < 0) {
cf3af59e 4275 goto error;
d6f42150
DG		 4276 }
4277
fac6795d 4278 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4279 snprintf(apps_unix_sock_path, PATH_MAX,
4280 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4281 }
4282
4283 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4284 snprintf(client_unix_sock_path, PATH_MAX,
4285 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4286 }
0fdd1e2c
DG		 4287
4288 /* Set global SHM for ust */
4289 if (strlen(wait_shm_path) == 0) {
4290 snprintf(wait_shm_path, PATH_MAX,
4291 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4292 }
67e40797
DG		 4293
4294 /* Setup kernel consumerd path */
4295 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 4296 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 4297 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4298 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG		 4299
4300 DBG2("Kernel consumer err path: %s",
4301 kconsumer_data.err_unix_sock_path);
4302 DBG2("Kernel consumer cmd path: %s",
4303 kconsumer_data.cmd_unix_sock_path);
fac6795d 4304 } else {
b082db07
DG		 4305 home_path = get_home_dir();
4306 if (home_path == NULL) {
273ea72c
DG		 4307 /* TODO: Add --socket PATH option */
4308 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4309 ret = -EPERM;
4310 goto error;
b082db07
DG		 4311 }
4312
67e40797
DG		 4313 /*
4314 * Create rundir from home path. This will create something like
4315 * $HOME/.lttng
4316 */
990570ed 4317 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG		 4318 if (ret < 0) {
4319 ret = -ENOMEM;
4320 goto error;
4321 }
4322
4323 ret = create_lttng_rundir(rundir);
4324 if (ret < 0) {
4325 goto error;
4326 }
4327
fac6795d 4328 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4329 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4330 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4331 }
4332
4333 /* Set the cli tool unix socket path */
4334 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4335 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4336 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4337 }
0fdd1e2c
DG		 4338
4339 /* Set global SHM for ust */
4340 if (strlen(wait_shm_path) == 0) {
4341 snprintf(wait_shm_path, PATH_MAX,
4342 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4343 }
fac6795d
DG		 4344 }
4345
847177cd
DG		 4346 DBG("Client socket path %s", client_unix_sock_path);
4347 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4348 DBG("LTTng run directory path: %s", rundir);
4349
4350 /* 32 bits consumerd path setup */
4351 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 4352 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 4353 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4354 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG		 4355
4356 DBG2("UST consumer 32 bits err path: %s",
4357 ustconsumer32_data.err_unix_sock_path);
4358 DBG2("UST consumer 32 bits cmd path: %s",
4359 ustconsumer32_data.cmd_unix_sock_path);
4360
4361 /* 64 bits consumerd path setup */
4362 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 4363 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 4364 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4365 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG		 4366
4367 DBG2("UST consumer 64 bits err path: %s",
4368 ustconsumer64_data.err_unix_sock_path);
4369 DBG2("UST consumer 64 bits cmd path: %s",
4370 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4371
273ea72c 4372 /*
7d8234d9 4373 * See if daemon already exist.
fac6795d 4374 */
7d8234d9 4375 if ((ret = check_existing_daemon()) < 0) {
75462a81 4376 ERR("Already running daemon.\n");
273ea72c 4377 /*
cf3af59e
MD		 4378 * We do not goto exit because we must not cleanup()
4379 * because a daemon is already running.
ab118b20 4380 */
cf3af59e 4381 goto error;
a88df331
DG		 4382 }
4383
54d01ffb 4384 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4385
4386 /*
4387 * These actions must be executed as root. We do that *after* setting up
4388 * the sockets path because we MUST make the check for another daemon using
4389 * those paths *before* trying to set the kernel consumer sockets and init
4390 * kernel tracer.
4391 */
4392 if (is_root) {
67e40797 4393 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4394 if (ret < 0) {
4395 goto exit;
4396 }
4397
a88df331 4398 /* Setup kernel tracer */
4fba7219
DG		 4399 if (!opt_no_kernel) {
4400 init_kernel_tracer();
4401 }
a88df331
DG		 4402
4403 /* Set ulimit for open files */
4404 set_ulimit();
fac6795d
DG		 4405 }
4406
67e40797
DG		 4407 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4408 if (ret < 0) {
4409 goto exit;
4410 }
4411
4412 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4413 if (ret < 0) {
4414 goto exit;
4415 }
4416
cf3af59e
MD		 4417 if ((ret = set_signal_handler()) < 0) {
4418 goto exit;
fac6795d
DG		 4419 }
4420
d6f42150 4421 /* Setup the needed unix socket */
cf3af59e
MD		 4422 if ((ret = init_daemon_socket()) < 0) {
4423 goto exit;
fac6795d
DG		 4424 }
4425
4426 /* Set credentials to socket */
be040666 4427 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4428 goto exit;
fac6795d
DG		 4429 }
4430
5b8719f5
DG		 4431 /* Get parent pid if -S, --sig-parent is specified. */
4432 if (opt_sig_parent) {
4433 ppid = getppid();
4434 }
4435
7a485870 4436 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4437 if ((ret = create_kernel_poll_pipe()) < 0) {
4438 goto exit;
7a485870
DG		 4439 }
4440
099e26bd
DG		 4441 /* Setup the thread apps communication pipe. */
4442 if ((ret = create_apps_cmd_pipe()) < 0) {
4443 goto exit;
4444 }
4445
4446 /* Init UST command queue. */
4447 cds_wfq_init(&ust_cmd_queue.queue);
4448
f6a9efaa
DG		 4449 /* Init UST app hash table */
4450 ust_app_ht_alloc();
4451
273ea72c 4452 /*
54d01ffb
DG		 4453 * Get session list pointer. This pointer MUST NOT be free(). This list is
4454 * statically declared in session.c
273ea72c 4455 */
54d01ffb 4456 session_list_ptr = session_get_list();
b5541356 4457
5eb91c98
DG		 4458 /* Set up max poll set size */
4459 lttng_poll_set_max_size();
4460
cf3af59e 4461 /* Create thread to manage the client socket */
099e26bd
DG		 4462 ret = pthread_create(&client_thread, NULL,
4463 thread_manage_clients, (void *) NULL);
cf3af59e 4464 if (ret != 0) {
099e26bd 4465 perror("pthread_create clients");
cf3af59e
MD		 4466 goto exit_client;
4467 }
fac6795d 4468
099e26bd
DG		 4469 /* Create thread to dispatch registration */
4470 ret = pthread_create(&dispatch_thread, NULL,
4471 thread_dispatch_ust_registration, (void *) NULL);
4472 if (ret != 0) {
4473 perror("pthread_create dispatch");
4474 goto exit_dispatch;
4475 }
4476
4477 /* Create thread to manage application registration. */
4478 ret = pthread_create(&reg_apps_thread, NULL,
4479 thread_registration_apps, (void *) NULL);
4480 if (ret != 0) {
4481 perror("pthread_create registration");
4482 goto exit_reg_apps;
4483 }
4484
cf3af59e 4485 /* Create thread to manage application socket */
54d01ffb
DG		 4486 ret = pthread_create(&apps_thread, NULL,
4487 thread_manage_apps, (void *) NULL);
cf3af59e 4488 if (ret != 0) {
099e26bd 4489 perror("pthread_create apps");
cf3af59e
MD		 4490 goto exit_apps;
4491 }
fac6795d 4492
cf3af59e 4493 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4494 ret = pthread_create(&kernel_thread, NULL,
4495 thread_manage_kernel, (void *) NULL);
cf3af59e 4496 if (ret != 0) {
099e26bd 4497 perror("pthread_create kernel");
cf3af59e
MD		 4498 goto exit_kernel;
4499 }
7a485870 4500
b25a8868
DG		 4501 tracepoint(sessiond_boot_end);
4502
cf3af59e
MD		 4503 ret = pthread_join(kernel_thread, &status);
4504 if (ret != 0) {
4505 perror("pthread_join");
4506 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4507 }
4508
cf3af59e
MD		 4509exit_kernel:
4510 ret = pthread_join(apps_thread, &status);
4511 if (ret != 0) {
4512 perror("pthread_join");
4513 goto error; /* join error, exit without cleanup */
4514 }
fac6795d 4515
cf3af59e 4516exit_apps:
099e26bd
DG		 4517 ret = pthread_join(reg_apps_thread, &status);
4518 if (ret != 0) {
4519 perror("pthread_join");
4520 goto error; /* join error, exit without cleanup */
4521 }
4522
4523exit_reg_apps:
4524 ret = pthread_join(dispatch_thread, &status);
4525 if (ret != 0) {
4526 perror("pthread_join");
4527 goto error; /* join error, exit without cleanup */
4528 }
4529
4530exit_dispatch:
cf3af59e
MD		 4531 ret = pthread_join(client_thread, &status);
4532 if (ret != 0) {
4533 perror("pthread_join");
4534 goto error; /* join error, exit without cleanup */
4535 }
4536
3bd1e081 4537 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4538 if (ret != 0) {
3bd1e081 4539 perror("join_consumer");
cf3af59e
MD		 4540 goto error; /* join error, exit without cleanup */
4541 }
a88df331 4542
cf3af59e 4543exit_client:
a88df331 4544exit:
cf3af59e
MD		 4545 /*
4546 * cleanup() is called when no other thread is running.
4547 */
f6a9efaa 4548 rcu_thread_online();
cf3af59e 4549 cleanup();
f6a9efaa
DG		 4550 rcu_thread_offline();
4551 rcu_unregister_thread();
67e40797 4552 if (!ret) {
cf3af59e 4553 exit(EXIT_SUCCESS);
67e40797 4554 }
cf3af59e 4555error:
5e16da05 4556 exit(EXIT_FAILURE);
fac6795d 4557}
LTTng 2.0 tools and control repository
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