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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
797 /* For all tracing session(s) */
798 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG		 799 if (sess->ust_session) {
800 ust_app_global_update(sess->ust_session, app_sock);
801 }
487cf67c
DG		 802 }
803}
804
7a485870 805/*
d063d709 806 * This thread manage event coming from the kernel.
7a485870 807 *
d063d709
DG		 808 * Features supported in this thread:
809 * -) CPU Hotplug
7a485870
DG		 810 */
811static void *thread_manage_kernel(void *data)
812{
5eb91c98
DG		 813 int ret, i, pollfd, update_poll_flag = 1;
814 uint32_t revents, nb_fd;
7a485870 815 char tmp;
5eb91c98 816 struct lttng_poll_event events;
7a485870 817
b25a8868
DG		 818 tracepoint(sessiond_th_kern_start);
819
7a485870
DG		 820 DBG("Thread manage kernel started");
821
5eb91c98
DG		 822 ret = create_thread_poll_set(&events, 2);
823 if (ret < 0) {
824 goto error;
825 }
826
827 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
828 if (ret < 0) {
829 goto error;
830 }
831
7a485870
DG		 832 while (1) {
833 if (update_poll_flag == 1) {
5f822d0a
DG		 834 /*
835 * Reset number of fd in the poll set. Always 2 since there is the thread
836 * quit pipe and the kernel pipe.
837 */
838 events.nb_fd = 2;
839
5eb91c98
DG		 840 ret = update_kernel_poll(&events);
841 if (ret < 0) {
7a485870
DG		 842 goto error;
843 }
844 update_poll_flag = 0;
845 }
846
5eb91c98
DG		 847 nb_fd = LTTNG_POLL_GETNB(&events);
848
849 DBG("Thread kernel polling on %d fds", nb_fd);
850
851 /* Zeroed the poll events */
852 lttng_poll_reset(&events);
7a485870 853
b25a8868
DG		 854 tracepoint(sessiond_th_kern_poll);
855
7a485870 856 /* Poll infinite value of time */
5eb91c98 857 ret = lttng_poll_wait(&events, -1);
7a485870 858 if (ret < 0) {
7a485870
DG		 859 goto error;
860 } else if (ret == 0) {
861 /* Should not happen since timeout is infinite */
85611738
DG		 862 ERR("Return value of poll is 0 with an infinite timeout.\n"
863 "This should not have happened! Continuing...");
7a485870
DG		 864 continue;
865 }
866
5eb91c98
DG		 867 for (i = 0; i < nb_fd; i++) {
868 /* Fetch once the poll data */
869 revents = LTTNG_POLL_GETEV(&events, i);
870 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 871
5eb91c98
DG		 872 /* Thread quit pipe has been closed. Killing thread. */
873 ret = check_thread_quit_pipe(pollfd, revents);
874 if (ret) {
875 goto error;
876 }
7a485870 877
5eb91c98
DG		 878 /* Check for data on kernel pipe */
879 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
880 ret = read(kernel_poll_pipe[0], &tmp, 1);
881 update_poll_flag = 1;
882 continue;
883 } else {
884 /*
885 * New CPU detected by the kernel. Adding kernel stream to
886 * kernel session and updating the kernel consumer
887 */
888 if (revents & LPOLLIN) {
2bdd86d4 889 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 890 if (ret < 0) {
891 continue;
892 }
893 break;
894 /*
895 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
896 * and unregister kernel stream at this point.
897 */
7a485870 898 }
7a485870
DG		 899 }
900 }
901 }
902
903error:
904 DBG("Kernel thread dying");
273ea72c
DG		 905 close(kernel_poll_pipe[0]);
906 close(kernel_poll_pipe[1]);
5eb91c98
DG		 907
908 lttng_poll_clean(&events);
909
7a485870
DG		 910 return NULL;
911}
912
1d4b027a 913/*
3bd1e081 914 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 915 */
3bd1e081 916static void *thread_manage_consumer(void *data)
1d4b027a 917{
5eb91c98
DG		 918 int sock = 0, i, ret, pollfd;
919 uint32_t revents, nb_fd;
1d4b027a 920 enum lttcomm_return_code code;
5eb91c98 921 struct lttng_poll_event events;
3bd1e081 922 struct consumer_data *consumer_data = data;
1d4b027a 923
b25a8868
DG		 924 tracepoint(sessiond_th_kcon_start);
925
3bd1e081 926 DBG("[thread] Manage consumer started");
1d4b027a 927
3bd1e081 928 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 929 if (ret < 0) {
930 goto error;
931 }
932
5eb91c98
DG		 933 /*
934 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
935 * Nothing more will be added to this poll set.
936 */
937 ret = create_thread_poll_set(&events, 2);
938 if (ret < 0) {
939 goto error;
940 }
273ea72c 941
3bd1e081 942 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 943 if (ret < 0) {
944 goto error;
945 }
273ea72c 946
5eb91c98 947 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c 948
b25a8868
DG		 949 tracepoint(sessiond_th_kcon_poll);
950
273ea72c 951 /* Inifinite blocking call, waiting for transmission */
5eb91c98 952 ret = lttng_poll_wait(&events, -1);
273ea72c 953 if (ret < 0) {
273ea72c
DG		 954 goto error;
955 }
956
5eb91c98
DG		 957 for (i = 0; i < nb_fd; i++) {
958 /* Fetch once the poll data */
959 revents = LTTNG_POLL_GETEV(&events, i);
960 pollfd = LTTNG_POLL_GETFD(&events, i);
961
962 /* Thread quit pipe has been closed. Killing thread. */
963 ret = check_thread_quit_pipe(pollfd, revents);
964 if (ret) {
965 goto error;
966 }
967
968 /* Event on the registration socket */
3bd1e081 969 if (pollfd == consumer_data->err_sock) {
5eb91c98 970 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 971 ERR("consumer err socket poll error");
5eb91c98
DG		 972 goto error;
973 }
974 }
273ea72c
DG		 975 }
976
3bd1e081 977 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 978 if (sock < 0) {
979 goto error;
980 }
981
3bd1e081 982 DBG2("Receiving code from consumer err_sock");
ee0b0061 983
712ea556 984 /* Getting status code from kconsumerd */
54d01ffb
DG		 985 ret = lttcomm_recv_unix_sock(sock, &code,
986 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 987 if (ret <= 0) {
988 goto error;
989 }
990
3bd1e081
MD		 991 if (code == CONSUMERD_COMMAND_SOCK_READY) {
992 consumer_data->cmd_sock =
993 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
994 if (consumer_data->cmd_sock < 0) {
995 sem_post(&consumer_data->sem);
48842b30 996 PERROR("consumer connect");
1d4b027a
DG		 997 goto error;
998 }
999 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 1000 sem_post(&consumer_data->sem);
1001 DBG("consumer command socket ready");
1d4b027a 1002 } else {
3bd1e081 1003 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 1004 lttcomm_get_readable_code(-code));
1005 goto error;
1006 }
1007
54d01ffb 1008 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1009 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1010 if (ret < 0) {
72079cae
DG		 1011 goto error;
1012 }
1013
5eb91c98
DG		 1014 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1015 if (ret < 0) {
72079cae 1016 goto error;
5eb91c98
DG		 1017 }
1018
1019 /* Update number of fd */
1020 nb_fd = LTTNG_POLL_GETNB(&events);
1021
1022 /* Inifinite blocking call, waiting for transmission */
1023 ret = lttng_poll_wait(&events, -1);
1024 if (ret < 0) {
72079cae
DG		 1025 goto error;
1026 }
1027
5eb91c98
DG		 1028 for (i = 0; i < nb_fd; i++) {
1029 /* Fetch once the poll data */
1030 revents = LTTNG_POLL_GETEV(&events, i);
1031 pollfd = LTTNG_POLL_GETFD(&events, i);
1032
1033 /* Thread quit pipe has been closed. Killing thread. */
1034 ret = check_thread_quit_pipe(pollfd, revents);
1035 if (ret) {
1036 goto error;
1037 }
1038
1039 /* Event on the kconsumerd socket */
1040 if (pollfd == sock) {
1041 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1042 ERR("consumer err socket second poll error");
5eb91c98
DG		 1043 goto error;
1044 }
1045 }
1046 }
1047
712ea556 1048 /* Wait for any kconsumerd error */
54d01ffb
DG		 1049 ret = lttcomm_recv_unix_sock(sock, &code,
1050 sizeof(enum lttcomm_return_code));
712ea556 1051 if (ret <= 0) {
3bd1e081 1052 ERR("consumer closed the command socket");
712ea556 1053 goto error;
6f61d021 1054 }
1d4b027a 1055
3bd1e081 1056 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1057
1d4b027a 1058error:
3bd1e081
MD		 1059 DBG("consumer thread dying");
1060 close(consumer_data->err_sock);
1061 close(consumer_data->cmd_sock);
5eb91c98 1062 close(sock);
273ea72c 1063
3bd1e081
MD		 1064 unlink(consumer_data->err_unix_sock_path);
1065 unlink(consumer_data->cmd_unix_sock_path);
1066 consumer_data->pid = 0;
0177d773 1067
5eb91c98 1068 lttng_poll_clean(&events);
0177d773 1069
5eb91c98 1070 return NULL;
099e26bd
DG		 1071}
1072
099e26bd
DG		 1073/*
1074 * This thread manage application communication.
1d4b027a
DG		 1075 */
1076static void *thread_manage_apps(void *data)
099e26bd 1077{
5eb91c98
DG		 1078 int i, ret, pollfd;
1079 uint32_t revents, nb_fd;
099e26bd 1080 struct ust_command ust_cmd;
5eb91c98 1081 struct lttng_poll_event events;
099e26bd 1082
85c434ee
DG		 1083 tracepoint(sessiond_th_apps_start);
1084
099e26bd
DG		 1085 DBG("[thread] Manage application started");
1086
f6a9efaa
DG		 1087 rcu_register_thread();
1088 rcu_thread_online();
1089
5eb91c98
DG		 1090 ret = create_thread_poll_set(&events, 2);
1091 if (ret < 0) {
1092 goto error;
1093 }
099e26bd 1094
5eb91c98
DG		 1095 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1096 if (ret < 0) {
1097 goto error;
1098 }
099e26bd 1099
5eb91c98
DG		 1100 while (1) {
1101 /* Zeroed the events structure */
1102 lttng_poll_reset(&events);
0177d773 1103
5eb91c98 1104 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1105
1106 DBG("Apps thread polling on %d fds", nb_fd);
1107
85c434ee
DG		 1108 tracepoint(sessiond_th_apps_poll);
1109
099e26bd 1110 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1111 ret = lttng_poll_wait(&events, -1);
099e26bd 1112 if (ret < 0) {
099e26bd
DG		 1113 goto error;
1114 }
1115
5eb91c98
DG		 1116 for (i = 0; i < nb_fd; i++) {
1117 /* Fetch once the poll data */
1118 revents = LTTNG_POLL_GETEV(&events, i);
1119 pollfd = LTTNG_POLL_GETFD(&events, i);
1120
1121 /* Thread quit pipe has been closed. Killing thread. */
1122 ret = check_thread_quit_pipe(pollfd, revents);
1123 if (ret) {
099e26bd 1124 goto error;
5eb91c98 1125 }
62d53818 1126
5eb91c98
DG		 1127 /* Inspect the apps cmd pipe */
1128 if (pollfd == apps_cmd_pipe[0]) {
1129 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1130 ERR("Apps command pipe error");
0177d773 1131 goto error;
5eb91c98 1132 } else if (revents & LPOLLIN) {
dab4c8a1 1133 tracepoint(ust_register_read_start);
5eb91c98
DG		 1134 /* Empty pipe */
1135 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1136 if (ret < 0 || ret < sizeof(ust_cmd)) {
1137 perror("read apps cmd pipe");
1138 goto error;
1139 }
a89c7d1b 1140 tracepoint(ust_register_read_stop);
099e26bd 1141
a89c7d1b 1142 tracepoint(ust_register_add_start);
5eb91c98 1143 /* Register applicaton to the session daemon */
56fff090 1144 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1145 ust_cmd.sock);
88ff5b7f 1146 if (ret == -ENOMEM) {
5eb91c98 1147 goto error;
88ff5b7f
MD		 1148 } else if (ret < 0) {
1149 break;
5eb91c98 1150 }
a89c7d1b 1151 tracepoint(ust_register_add_stop);
85c434ee 1152
a89c7d1b 1153 tracepoint(ust_register_done_start);
acc7b41b 1154 /*
e0c7ec2b 1155 * Validate UST version compatibility.
acc7b41b 1156 */
e0c7ec2b
DG		 1157 ret = ust_app_validate_version(ust_cmd.sock);
1158 if (ret >= 0) {
1159 /*
1160 * Add channel(s) and event(s) to newly registered apps
1161 * from lttng global UST domain.
1162 */
1163 update_ust_app(ust_cmd.sock);
1164 }
acc7b41b 1165
f2ca2e25 1166 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG		 1167 if (ret < 0) {
1168 /*
1169 * If the registration is not possible, we simply
1170 * unregister the apps and continue
1171 */
56fff090 1172 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1173 } else {
1174 /*
1175 * We just need here to monitor the close of the UST
1176 * socket and poll set monitor those by default.
1177 */
1178 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1179 if (ret < 0) {
1180 goto error;
1181 }
1182
54d01ffb
DG		 1183 DBG("Apps with sock %d added to poll set",
1184 ust_cmd.sock);
5eb91c98 1185 }
a89c7d1b 1186 tracepoint(ust_register_done_stop);
5eb91c98 1187 break;
0177d773 1188 }
5eb91c98
DG		 1189 } else {
1190 /*
54d01ffb
DG		 1191 * At this point, we know that a registered application made
1192 * the event at poll_wait.
5eb91c98
DG		 1193 */
1194 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
aa231298
DG		 1195 tracepoint(ust_unregister_start);
1196
5eb91c98
DG		 1197 /* Removing from the poll set */
1198 ret = lttng_poll_del(&events, pollfd);
1199 if (ret < 0) {
1200 goto error;
1201 }
099e26bd 1202
b9d9b220 1203 /* Socket closed on remote end. */
56fff090 1204 ust_app_unregister(pollfd);
aa231298
DG		 1205
1206 tracepoint(ust_unregister_stop);
5eb91c98 1207 break;
0177d773 1208 }
099e26bd
DG		 1209 }
1210 }
099e26bd
DG		 1211 }
1212
1213error:
1214 DBG("Application communication apps dying");
1215 close(apps_cmd_pipe[0]);
1216 close(apps_cmd_pipe[1]);
1217
5eb91c98 1218 lttng_poll_clean(&events);
099e26bd 1219
f6a9efaa
DG		 1220 rcu_thread_offline();
1221 rcu_unregister_thread();
099e26bd
DG		 1222 return NULL;
1223}
1224
1225/*
1226 * Dispatch request from the registration threads to the application
1227 * communication thread.
1228 */
1229static void *thread_dispatch_ust_registration(void *data)
1230{
1231 int ret;
1232 struct cds_wfq_node *node;
1233 struct ust_command *ust_cmd = NULL;
1234
85c434ee
DG		 1235 tracepoint(sessiond_th_dispatch_start);
1236
099e26bd
DG		 1237 DBG("[thread] Dispatch UST command started");
1238
1239 while (!dispatch_thread_exit) {
1240 /* Atomically prepare the queue futex */
1241 futex_nto1_prepare(&ust_cmd_queue.futex);
1242
1243 do {
85c434ee
DG		 1244 tracepoint(sessiond_th_dispatch_block);
1245
099e26bd
DG		 1246 /* Dequeue command for registration */
1247 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1248 if (node == NULL) {
00a17c97 1249 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1250 /* Continue thread execution */
1251 break;
1252 }
1253
62d53818
DG		 1254 tracepoint(ust_dispatch_register_start);
1255
099e26bd
DG		 1256 ust_cmd = caa_container_of(node, struct ust_command, node);
1257
2f50c8a3
DG		 1258 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1259 " gid:%d sock:%d name:%s (version %d.%d)",
1260 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1261 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1262 ust_cmd->sock, ust_cmd->reg_msg.name,
1263 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1264 /*
1265 * Inform apps thread of the new application registration. This
1266 * call is blocking so we can be assured that the data will be read
1267 * at some point in time or wait to the end of the world :)
1268 */
1269 ret = write(apps_cmd_pipe[1], ust_cmd,
1270 sizeof(struct ust_command));
1271 if (ret < 0) {
1272 perror("write apps cmd pipe");
1273 if (errno == EBADF) {
1274 /*
1275 * We can't inform the application thread to process
1276 * registration. We will exit or else application
1277 * registration will not occur and tracing will never
1278 * start.
1279 */
1280 goto error;
1281 }
1282 }
1283 free(ust_cmd);
1284 } while (node != NULL);
1285
62d53818
DG		 1286 tracepoint(ust_dispatch_register_stop);
1287
099e26bd
DG		 1288 /* Futex wait on queue. Blocking call on futex() */
1289 futex_nto1_wait(&ust_cmd_queue.futex);
1290 }
1291
1292error:
1293 DBG("Dispatch thread dying");
1294 return NULL;
1295}
1296
1297/*
1298 * This thread manage application registration.
1299 */
1300static void *thread_registration_apps(void *data)
1d4b027a 1301{
5eb91c98
DG		 1302 int sock = 0, i, ret, pollfd;
1303 uint32_t revents, nb_fd;
1304 struct lttng_poll_event events;
099e26bd
DG		 1305 /*
1306 * Get allocated in this thread, enqueued to a global queue, dequeued and
1307 * freed in the manage apps thread.
1308 */
1309 struct ust_command *ust_cmd = NULL;
1d4b027a 1310
62d53818 1311 tracepoint(sessiond_th_reg_start);
b25a8868 1312
099e26bd 1313 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1314
1315 ret = lttcomm_listen_unix_sock(apps_sock);
1316 if (ret < 0) {
1317 goto error;
1318 }
1319
5eb91c98
DG		 1320 /*
1321 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1322 * more will be added to this poll set.
1323 */
1324 ret = create_thread_poll_set(&events, 2);
1325 if (ret < 0) {
1326 goto error;
1327 }
273ea72c 1328
5eb91c98
DG		 1329 /* Add the application registration socket */
1330 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1331 if (ret < 0) {
1332 goto error;
1333 }
273ea72c 1334
1d4b027a 1335 /* Notify all applications to register */
0fdd1e2c
DG		 1336 ret = notify_ust_apps(1);
1337 if (ret < 0) {
1338 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1339 "Execution continues but there might be problem for already\n"
1340 "running applications that wishes to register.");
0fdd1e2c 1341 }
1d4b027a
DG		 1342
1343 while (1) {
1344 DBG("Accepting application registration");
273ea72c 1345
62d53818 1346 tracepoint(sessiond_th_reg_poll);
b25a8868 1347
5eb91c98
DG		 1348 nb_fd = LTTNG_POLL_GETNB(&events);
1349
273ea72c 1350 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1351 ret = lttng_poll_wait(&events, -1);
273ea72c 1352 if (ret < 0) {
273ea72c
DG		 1353 goto error;
1354 }
1355
5eb91c98
DG		 1356 for (i = 0; i < nb_fd; i++) {
1357 /* Fetch once the poll data */
1358 revents = LTTNG_POLL_GETEV(&events, i);
1359 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1360
5eb91c98
DG		 1361 /* Thread quit pipe has been closed. Killing thread. */
1362 ret = check_thread_quit_pipe(pollfd, revents);
1363 if (ret) {
90014c57
DG		 1364 goto error;
1365 }
62d53818 1366
5eb91c98
DG		 1367 /* Event on the registration socket */
1368 if (pollfd == apps_sock) {
1369 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1370 ERR("Register apps socket poll error");
1371 goto error;
1372 } else if (revents & LPOLLIN) {
dab4c8a1
DG		 1373 /* Registration starts here. Recording cycles */
1374 tracepoint(ust_register_start);
1d4b027a 1375
5eb91c98
DG		 1376 sock = lttcomm_accept_unix_sock(apps_sock);
1377 if (sock < 0) {
1378 goto error;
1379 }
099e26bd 1380
5eb91c98 1381 /* Create UST registration command for enqueuing */
ba7f0ae5 1382 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1383 if (ust_cmd == NULL) {
ba7f0ae5 1384 perror("ust command zmalloc");
5eb91c98
DG		 1385 goto error;
1386 }
1d4b027a 1387
5eb91c98
DG		 1388 /*
1389 * Using message-based transmissions to ensure we don't
1390 * have to deal with partially received messages.
1391 */
1392 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1393 sizeof(struct ust_register_msg));
1394 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1395 if (ret < 0) {
1396 perror("lttcomm_recv_unix_sock register apps");
1397 } else {
1398 ERR("Wrong size received on apps register");
1399 }
1400 free(ust_cmd);
1401 close(sock);
1402 continue;
1403 }
099e26bd 1404
5eb91c98 1405 ust_cmd->sock = sock;
099e26bd 1406
5eb91c98
DG		 1407 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1408 " gid:%d sock:%d name:%s (version %d.%d)",
1409 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1410 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1411 ust_cmd->sock, ust_cmd->reg_msg.name,
1412 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1413
5eb91c98
DG		 1414 /*
1415 * Lock free enqueue the registration request. The red pill
54d01ffb 1416 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1417 */
1418 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
62d53818 1419
5eb91c98
DG		 1420 /*
1421 * Wake the registration queue futex. Implicit memory
1422 * barrier with the exchange in cds_wfq_enqueue.
1423 */
1424 futex_nto1_wake(&ust_cmd_queue.futex);
dab4c8a1
DG		 1425
1426 tracepoint(ust_register_stop);
5eb91c98
DG		 1427 }
1428 }
90014c57 1429 }
1d4b027a
DG		 1430 }
1431
1432error:
0fdd1e2c
DG		 1433 DBG("UST Registration thread dying");
1434
1435 /* Notify that the registration thread is gone */
1436 notify_ust_apps(0);
1437
1438 close(apps_sock);
1439 close(sock);
273ea72c 1440 unlink(apps_unix_sock_path);
0fdd1e2c 1441
5eb91c98
DG		 1442 lttng_poll_clean(&events);
1443
1d4b027a
DG		 1444 return NULL;
1445}
1446
8c0faa1d 1447/*
3bd1e081 1448 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1449 * exec or it will fails.
8c0faa1d 1450 */
3bd1e081 1451static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1452{
1453 int ret;
ee0b0061
DG		 1454 struct timespec timeout;
1455
1456 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1457 timeout.tv_nsec = 0;
8c0faa1d
DG		 1458
1459 /* Setup semaphore */
3bd1e081 1460 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1461 if (ret < 0) {
3bd1e081 1462 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1463 goto error;
1464 }
8c0faa1d 1465
3bd1e081
MD		 1466 ret = pthread_create(&consumer_data->thread, NULL,
1467 thread_manage_consumer, consumer_data);
8c0faa1d 1468 if (ret != 0) {
3bd1e081 1469 PERROR("pthread_create consumer");
ee0b0061 1470 ret = -1;
8c0faa1d
DG		 1471 goto error;
1472 }
1473
ee0b0061
DG		 1474 /* Get time for sem_timedwait absolute timeout */
1475 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1476 if (ret < 0) {
3bd1e081 1477 PERROR("clock_gettime spawn consumer");
ee0b0061 1478 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1479 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1480 } else {
1481 /* Normal timeout if the gettime was successful */
1482 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1483 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1484 }
8c0faa1d 1485
ee0b0061
DG		 1486 if (ret < 0) {
1487 if (errno == ETIMEDOUT) {
1488 /*
1489 * Call has timed out so we kill the kconsumerd_thread and return
1490 * an error.
1491 */
3bd1e081
MD		 1492 ERR("The consumer thread was never ready. Killing it");
1493 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1494 if (ret < 0) {
3bd1e081 1495 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1496 }
1497 } else {
3bd1e081 1498 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1499 }
1500 goto error;
1501 }
1502
3bd1e081
MD		 1503 pthread_mutex_lock(&consumer_data->pid_mutex);
1504 if (consumer_data->pid == 0) {
712ea556 1505 ERR("Kconsumerd did not start");
3bd1e081 1506 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1507 goto error;
1508 }
3bd1e081 1509 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1510
8c0faa1d
DG		 1511 return 0;
1512
1513error:
1514 return ret;
1515}
1516
d9800920 1517/*
3bd1e081 1518 * Join consumer thread
d9800920 1519 */
3bd1e081 1520static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1521{
1522 void *status;
1523 int ret;
1524
3bd1e081
MD		 1525 if (consumer_data->pid != 0) {
1526 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1527 if (ret) {
3bd1e081 1528 ERR("Error killing consumer daemon");
cf3af59e
MD		 1529 return ret;
1530 }
3bd1e081 1531 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1532 } else {
1533 return 0;
1534 }
1535}
1536
8c0faa1d 1537/*
3bd1e081 1538 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1539 *
d063d709 1540 * Return pid if successful else -1.
8c0faa1d 1541 */
3bd1e081 1542static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1543{
1544 int ret;
1545 pid_t pid;
94c55f17 1546 const char *consumer_to_use;
53086306 1547 const char *verbosity;
94c55f17 1548 struct stat st;
8c0faa1d 1549
3bd1e081 1550 DBG("Spawning consumerd");
c49dc785 1551
8c0faa1d
DG		 1552 pid = fork();
1553 if (pid == 0) {
1554 /*
3bd1e081 1555 * Exec consumerd.
8c0faa1d 1556 */
daee5345 1557 if (opt_verbose_consumer) {
53086306
DG		 1558 verbosity = "--verbose";
1559 } else {
1560 verbosity = "--quiet";
1561 }
3bd1e081
MD		 1562 switch (consumer_data->type) {
1563 case LTTNG_CONSUMER_KERNEL:
94c55f17 1564 /*
c7704d57
DG		 1565 * Find out which consumerd to execute. We will first try the
1566 * 64-bit path, then the sessiond's installation directory, and
1567 * fallback on the 32-bit one,
94c55f17 1568 */
63a799e8
AM		 1569 DBG3("Looking for a kernel consumer at these locations:");
1570 DBG3(" 1) %s", consumerd64_bin);
1571 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1572 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1573 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1574 DBG3("Found location #1");
94c55f17 1575 consumer_to_use = consumerd64_bin;
94c55f17 1576 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1577 DBG3("Found location #2");
94c55f17 1578 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1579 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1580 DBG3("Found location #3");
eb1e0bd4 1581 consumer_to_use = consumerd32_bin;
94c55f17 1582 } else {
63a799e8 1583 DBG("Could not find any valid consumerd executable");
94c55f17
AM		 1584 break;
1585 }
1586 DBG("Using kernel consumer at: %s", consumer_to_use);
1587 execl(consumer_to_use,
1588 "lttng-consumerd", verbosity, "-k",
1589 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1590 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1591 NULL);
3bd1e081 1592 break;
7753dea8
MD		 1593 case LTTNG_CONSUMER64_UST:
1594 {
b1e0b6b6 1595 char *tmpnew = NULL;
8f4905da
MD		 1596
1597 if (consumerd64_libdir[0] != '\0') {
1598 char *tmp;
1599 size_t tmplen;
1600
1601 tmp = getenv("LD_LIBRARY_PATH");
1602 if (!tmp) {
1603 tmp = "";
1604 }
1605 tmplen = strlen("LD_LIBRARY_PATH=")
1606 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1607 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1608 if (!tmpnew) {
1609 ret = -ENOMEM;
1610 goto error;
1611 }
1612 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1613 strcat(tmpnew, consumerd64_libdir);
1614 if (tmp[0] != '\0') {
1615 strcat(tmpnew, ":");
1616 strcat(tmpnew, tmp);
1617 }
1618 ret = putenv(tmpnew);
1619 if (ret) {
1620 ret = -errno;
1621 goto error;
1622 }
1623 }
94c55f17 1624 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1625 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1626 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1627 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1628 NULL);
8f4905da
MD		 1629 if (consumerd64_libdir[0] != '\0') {
1630 free(tmpnew);
1631 }
1632 if (ret) {
1633 goto error;
1634 }
3bd1e081 1635 break;
7753dea8
MD		 1636 }
1637 case LTTNG_CONSUMER32_UST:
1638 {
937dde8e 1639 char *tmpnew = NULL;
8f4905da
MD		 1640
1641 if (consumerd32_libdir[0] != '\0') {
1642 char *tmp;
1643 size_t tmplen;
1644
1645 tmp = getenv("LD_LIBRARY_PATH");
1646 if (!tmp) {
1647 tmp = "";
1648 }
1649 tmplen = strlen("LD_LIBRARY_PATH=")
1650 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1651 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1652 if (!tmpnew) {
1653 ret = -ENOMEM;
1654 goto error;
1655 }
1656 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1657 strcat(tmpnew, consumerd32_libdir);
1658 if (tmp[0] != '\0') {
1659 strcat(tmpnew, ":");
1660 strcat(tmpnew, tmp);
1661 }
1662 ret = putenv(tmpnew);
1663 if (ret) {
1664 ret = -errno;
1665 goto error;
1666 }
1667 }
94c55f17 1668 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1669 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1670 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1671 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1672 NULL);
8f4905da
MD		 1673 if (consumerd32_libdir[0] != '\0') {
1674 free(tmpnew);
1675 }
1676 if (ret) {
1677 goto error;
1678 }
3bd1e081 1679 break;
7753dea8 1680 }
3bd1e081
MD		 1681 default:
1682 perror("unknown consumer type");
1683 exit(EXIT_FAILURE);
1684 }
8c0faa1d
DG		 1685 if (errno != 0) {
1686 perror("kernel start consumer exec");
1687 }
1688 exit(EXIT_FAILURE);
1689 } else if (pid > 0) {
1690 ret = pid;
8c0faa1d 1691 } else {
3bd1e081 1692 perror("start consumer fork");
8c0faa1d 1693 ret = -errno;
8c0faa1d 1694 }
8f4905da 1695error:
8c0faa1d
DG		 1696 return ret;
1697}
1698
693bd40b 1699/*
3bd1e081 1700 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1701 */
3bd1e081 1702static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1703{
1704 int ret;
1705
3bd1e081
MD		 1706 pthread_mutex_lock(&consumer_data->pid_mutex);
1707 if (consumer_data->pid != 0) {
1708 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1709 goto end;
1710 }
693bd40b 1711
3bd1e081 1712 ret = spawn_consumerd(consumer_data);
c49dc785 1713 if (ret < 0) {
3bd1e081
MD		 1714 ERR("Spawning consumerd failed");
1715 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1716 goto error;
693bd40b 1717 }
c49dc785 1718
3bd1e081
MD		 1719 /* Setting up the consumer_data pid */
1720 consumer_data->pid = ret;
48842b30 1721 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1722 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1723
3bd1e081
MD		 1724 DBG2("Spawning consumer control thread");
1725 ret = spawn_consumer_thread(consumer_data);
693bd40b 1726 if (ret < 0) {
3bd1e081 1727 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1728 goto error;
1729 }
1730
c49dc785 1731end:
693bd40b
DG		 1732 return 0;
1733
1734error:
1735 return ret;
1736}
1737
b73401da 1738/*
096102bd 1739 * Check version of the lttng-modules.
b73401da 1740 */
096102bd 1741static int validate_lttng_modules_version(void)
b73401da 1742{
096102bd 1743 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD		 1744}
1745
b73401da 1746/*
096102bd 1747 * Setup necessary data for kernel tracer action.
b73401da 1748 */
096102bd 1749static int init_kernel_tracer(void)
b73401da
DG		 1750{
1751 int ret;
b73401da 1752
096102bd
DG		 1753 /* Modprobe lttng kernel modules */
1754 ret = modprobe_lttng_control();
b73401da 1755 if (ret < 0) {
b73401da
DG		 1756 goto error;
1757 }
1758
096102bd
DG		 1759 /* Open debugfs lttng */
1760 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1761 if (kernel_tracer_fd < 0) {
1762 DBG("Failed to open %s", module_proc_lttng);
1763 ret = -1;
1764 goto error_open;
b73401da
DG		 1765 }
1766
096102bd
DG		 1767 /* Validate kernel version */
1768 ret = validate_lttng_modules_version();
b73401da 1769 if (ret < 0) {
096102bd 1770 goto error_version;
b73401da
DG		 1771 }
1772
096102bd 1773 ret = modprobe_lttng_data();
b73401da 1774 if (ret < 0) {
096102bd 1775 goto error_modules;
b73401da
DG		 1776 }
1777
f3ed775e 1778 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG		 1779 return 0;
1780
1781error_version:
1782 modprobe_remove_lttng_control();
1783 close(kernel_tracer_fd);
1784 kernel_tracer_fd = 0;
1785 return LTTCOMM_KERN_VERSION;
1786
1787error_modules:
1788 close(kernel_tracer_fd);
1789
1790error_open:
1791 modprobe_remove_lttng_control();
b73401da
DG		 1792
1793error:
b73401da
DG		 1794 WARN("No kernel tracer available");
1795 kernel_tracer_fd = 0;
096102bd 1796 return LTTCOMM_KERN_NA;
f3ed775e 1797}
33a2b854 1798
f3ed775e 1799/*
54d01ffb 1800 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1801 */
54d01ffb 1802static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1803{
f40799e8 1804 int ret = 0;
8c0faa1d 1805
3bd1e081 1806 if (session->consumer_fds_sent == 0) {
d9800920 1807 /*
54d01ffb
DG		 1808 * Assign default kernel consumer socket if no consumer assigned to the
1809 * kernel session. At this point, it's NOT suppose to be 0 but this is
1810 * an extra security check.
d9800920
DG		 1811 */
1812 if (session->consumer_fd == 0) {
3bd1e081 1813 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1814 }
1815
2bdd86d4 1816 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1817 if (ret < 0) {
f3ed775e
DG		 1818 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1819 goto error;
1820 }
1d4b027a 1821
3bd1e081 1822 session->consumer_fds_sent = 1;
f3ed775e 1823 }
1d4b027a
DG		 1824
1825error:
1826 return ret;
8c0faa1d
DG		 1827}
1828
0177d773
DG		 1829/*
1830 * Create an UST session and add it to the session ust list.
1831 */
44d3bd01
DG		 1832static int create_ust_session(struct ltt_session *session,
1833 struct lttng_domain *domain)
0177d773 1834{
13384287 1835 struct ltt_ust_session *lus = NULL;
6df2e2c9 1836 int ret;
44d3bd01
DG		 1837
1838 switch (domain->type) {
48842b30 1839 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1840 break;
1841 default:
13384287 1842 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1843 goto error;
1844 }
0177d773
DG		 1845
1846 DBG("Creating UST session");
1847
a991f516 1848 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1849 if (lus == NULL) {
44d3bd01 1850 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1851 goto error;
1852 }
1853
e11d277b 1854 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1855 session->uid, session->gid);
0177d773
DG		 1856 if (ret < 0) {
1857 if (ret != -EEXIST) {
1858 ERR("Trace directory creation error");
44d3bd01 1859 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1860 goto error;
1861 }
1862 }
1863
f6a9efaa
DG		 1864 /* The domain type dictate different actions on session creation */
1865 switch (domain->type) {
48842b30
DG		 1866 case LTTNG_DOMAIN_UST:
1867 /* No ustctl for the global UST domain */
1868 break;
1869 default:
36dc12cc 1870 ERR("Unknown UST domain on create session %d", domain->type);
0177d773
DG		 1871 goto error;
1872 }
6df2e2c9
MD		 1873 lus->uid = session->uid;
1874 lus->gid = session->gid;
f6a9efaa 1875 session->ust_session = lus;
44d3bd01
DG		 1876
1877 return LTTCOMM_OK;
0177d773
DG		 1878
1879error:
1880 free(lus);
1881 return ret;
1882}
1883
333f285e 1884/*
d063d709 1885 * Create a kernel tracer session then create the default channel.
333f285e 1886 */
f3ed775e 1887static int create_kernel_session(struct ltt_session *session)
333f285e 1888{
f3ed775e 1889 int ret;
f3ed775e
DG		 1890
1891 DBG("Creating kernel session");
1892
1893 ret = kernel_create_session(session, kernel_tracer_fd);
1894 if (ret < 0) {
1895 ret = LTTCOMM_KERN_SESS_FAIL;
1896 goto error;
333f285e
DG		 1897 }
1898
d9800920 1899 /* Set kernel consumer socket fd */
3bd1e081
MD		 1900 if (kconsumer_data.cmd_sock) {
1901 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1902 }
1903
e11d277b 1904 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1905 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1906 if (ret < 0) {
996b65c8 1907 if (ret != -EEXIST) {
7a485870
DG		 1908 ERR("Trace directory creation error");
1909 goto error;
1910 }
1911 }
6df2e2c9
MD		 1912 session->kernel_session->uid = session->uid;
1913 session->kernel_session->gid = session->gid;
7a485870 1914
f3ed775e
DG		 1915error:
1916 return ret;
333f285e
DG		 1917}
1918
8e0af1b4 1919/*
c7704d57
DG		 1920 * Check if the UID or GID match the session. Root user has access to all
1921 * sessions.
8e0af1b4 1922 */
c7704d57 1923static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1924{
c7704d57 1925 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD		 1926 return 0;
1927 } else {
1928 return 1;
1929 }
1930}
1931
1932static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1933{
1934 unsigned int i = 0;
1935 struct ltt_session *session;
1936
1937 DBG("Counting number of available session for UID %d GID %d",
1938 uid, gid);
1939 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1940 /*
1941 * Only list the sessions the user can control.
1942 */
1943 if (!session_access_ok(session, uid, gid)) {
1944 continue;
1945 }
1946 i++;
1947 }
1948 return i;
1949}
1950
6c9cc2ab
DG		 1951/*
1952 * Using the session list, filled a lttng_session array to send back to the
1953 * client for session listing.
1954 *
1955 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1956 * session_lock_list() and session_unlock_list().
6c9cc2ab 1957 */
c7704d57
DG		 1958static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1959 gid_t gid)
6c9cc2ab 1960{
8e0af1b4 1961 unsigned int i = 0;
6c9cc2ab
DG		 1962 struct ltt_session *session;
1963
8e0af1b4
MD		 1964 DBG("Getting all available session for UID %d GID %d",
1965 uid, gid);
6c9cc2ab
DG		 1966 /*
1967 * Iterate over session list and append data after the control struct in
1968 * the buffer.
1969 */
1970 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD		 1971 /*
1972 * Only list the sessions the user can control.
1973 */
1974 if (!session_access_ok(session, uid, gid)) {
1975 continue;
1976 }
6c9cc2ab 1977 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1978 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1979 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1980 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1981 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1982 i++;
1983 }
1984}
1985
9f19cc17
DG		 1986/*
1987 * Fill lttng_channel array of all channels.
1988 */
b551a063 1989static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1990 struct lttng_channel *channels)
1991{
1992 int i = 0;
1993 struct ltt_kernel_channel *kchan;
1994
1995 DBG("Listing channels for session %s", session->name);
1996
b551a063
DG		 1997 switch (domain) {
1998 case LTTNG_DOMAIN_KERNEL:
1999 /* Kernel channels */
2000 if (session->kernel_session != NULL) {
2001 cds_list_for_each_entry(kchan,
2002 &session->kernel_session->channel_list.head, list) {
2003 /* Copy lttng_channel struct to array */
2004 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2005 channels[i].enabled = kchan->enabled;
2006 i++;
2007 }
2008 }
2009 break;
2010 case LTTNG_DOMAIN_UST:
2011 {
bec39940 2012 struct lttng_ht_iter iter;
b551a063
DG		 2013 struct ltt_ust_channel *uchan;
2014
bec39940
DG		 2015 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2016 &iter.iter, uchan, node.node) {
b551a063
DG		 2017 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2018 channels[i].attr.overwrite = uchan->attr.overwrite;
2019 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2020 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2021 channels[i].attr.switch_timer_interval =
2022 uchan->attr.switch_timer_interval;
2023 channels[i].attr.read_timer_interval =
2024 uchan->attr.read_timer_interval;
aea829b3 2025 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2026 switch (uchan->attr.output) {
2027 case LTTNG_UST_MMAP:
2028 default:
2029 channels[i].attr.output = LTTNG_EVENT_MMAP;
2030 break;
2031 }
9f19cc17
DG		 2032 i++;
2033 }
b551a063
DG		 2034 break;
2035 }
2036 default:
2037 break;
9f19cc17 2038 }
b551a063 2039}
9f19cc17 2040
b551a063
DG		 2041/*
2042 * Create a list of ust global domain events.
2043 */
2044static int list_lttng_ust_global_events(char *channel_name,
2045 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2046{
2047 int i = 0, ret = 0;
2048 unsigned int nb_event = 0;
bec39940
DG		 2049 struct lttng_ht_iter iter;
2050 struct lttng_ht_node_str *node;
b551a063
DG		 2051 struct ltt_ust_channel *uchan;
2052 struct ltt_ust_event *uevent;
2053 struct lttng_event *tmp;
2054
2055 DBG("Listing UST global events for channel %s", channel_name);
2056
2057 rcu_read_lock();
2058
bec39940
DG		 2059 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2060 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG		 2061 if (node == NULL) {
2062 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2063 goto error;
b551a063
DG		 2064 }
2065
bec39940 2066 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2067
bec39940 2068 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2069
b551a063
DG		 2070 if (nb_event == 0) {
2071 ret = nb_event;
2072 goto error;
2073 }
2074
2075 DBG3("Listing UST global %d events", nb_event);
2076
2077 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2078 if (tmp == NULL) {
2079 ret = -LTTCOMM_FATAL;
2080 goto error;
2081 }
2082
bec39940 2083 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG		 2084 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2085 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2086 tmp[i].enabled = uevent->enabled;
2087 switch (uevent->attr.instrumentation) {
2088 case LTTNG_UST_TRACEPOINT:
2089 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2090 break;
2091 case LTTNG_UST_PROBE:
2092 tmp[i].type = LTTNG_EVENT_PROBE;
2093 break;
2094 case LTTNG_UST_FUNCTION:
2095 tmp[i].type = LTTNG_EVENT_FUNCTION;
2096 break;
0cda4f28 2097 }
8005f29a 2098 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2099 switch (uevent->attr.loglevel_type) {
8005f29a 2100 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2101 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2102 break;
8005f29a 2103 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2104 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD		 2105 break;
2106 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2107 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2108 break;
9f19cc17 2109 }
d7b75b30 2110 i++;
9f19cc17
DG		 2111 }
2112
b551a063
DG		 2113 ret = nb_event;
2114 *events = tmp;
2115
2116error:
2117 rcu_read_unlock();
2118 return ret;
9f19cc17
DG		 2119}
2120
2121/*
b551a063 2122 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2123 */
b551a063
DG		 2124static int list_lttng_kernel_events(char *channel_name,
2125 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2126{
b551a063
DG		 2127 int i = 0, ret;
2128 unsigned int nb_event;
9f19cc17 2129 struct ltt_kernel_event *event;
b551a063
DG		 2130 struct ltt_kernel_channel *kchan;
2131
2132 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2133 if (kchan == NULL) {
2134 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2135 goto error;
2136 }
2137
2138 nb_event = kchan->event_count;
9f19cc17
DG		 2139
2140 DBG("Listing events for channel %s", kchan->channel->name);
2141
b551a063
DG		 2142 if (nb_event == 0) {
2143 ret = nb_event;
2144 goto error;
2145 }
2146
2147 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2148 if (*events == NULL) {
2149 ret = LTTCOMM_FATAL;
2150 goto error;
2151 }
2152
9f19cc17
DG		 2153 /* Kernel channels */
2154 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2155 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2156 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2157 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2158 switch (event->event->instrumentation) {
2159 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2160 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2161 break;
2162 case LTTNG_KERNEL_KPROBE:
2163 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2164 (*events)[i].type = LTTNG_EVENT_PROBE;
2165 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2166 sizeof(struct lttng_kernel_kprobe));
2167 break;
2168 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2169 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2170 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2171 sizeof(struct lttng_kernel_function));
2172 break;
0133c199 2173 case LTTNG_KERNEL_NOOP:
b551a063 2174 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2175 break;
a54bd42d 2176 case LTTNG_KERNEL_SYSCALL:
b551a063 2177 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2178 break;
7a3d1328
MD		 2179 case LTTNG_KERNEL_ALL:
2180 assert(0);
2181 break;
9f19cc17
DG		 2182 }
2183 i++;
2184 }
b551a063
DG		 2185
2186 return nb_event;
2187
2188error:
2189 return ret;
9f19cc17
DG		 2190}
2191
fac6795d 2192/*
54d01ffb 2193 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2194 */
54d01ffb
DG		 2195static int cmd_disable_channel(struct ltt_session *session,
2196 int domain, char *channel_name)
fac6795d 2197{
54d01ffb 2198 int ret;
78f0bacd
DG		 2199 struct ltt_ust_session *usess;
2200
2201 usess = session->ust_session;
379473d2 2202
54d01ffb 2203 switch (domain) {
78f0bacd
DG		 2204 case LTTNG_DOMAIN_KERNEL:
2205 {
2206 ret = channel_kernel_disable(session->kernel_session,
2207 channel_name);
2208 if (ret != LTTCOMM_OK) {
2209 goto error;
2210 }
54d01ffb 2211
78f0bacd
DG		 2212 kernel_wait_quiescent(kernel_tracer_fd);
2213 break;
2214 }
2215 case LTTNG_DOMAIN_UST:
2216 {
2217 struct ltt_ust_channel *uchan;
bec39940 2218 struct lttng_ht *chan_ht;
78f0bacd 2219
7885e399
DG		 2220 chan_ht = usess->domain_global.channels;
2221
2222 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2223 if (uchan == NULL) {
2224 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2225 goto error;
78f0bacd
DG		 2226 }
2227
7885e399
DG		 2228 ret = channel_ust_disable(usess, domain, uchan);
2229 if (ret != LTTCOMM_OK) {
54d01ffb 2230 goto error;
78f0bacd 2231 }
78f0bacd
DG		 2232 break;
2233 }
d78d6610 2234#if 0
78f0bacd
DG		 2235 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2236 case LTTNG_DOMAIN_UST_EXEC_NAME:
2237 case LTTNG_DOMAIN_UST_PID:
d78d6610 2238#endif
78f0bacd
DG		 2239 default:
2240 ret = LTTCOMM_UNKNOWN_DOMAIN;
2241 goto error;
20fe2104
DG		 2242 }
2243
54d01ffb 2244 ret = LTTCOMM_OK;
d65106b1 2245
54d01ffb
DG		 2246error:
2247 return ret;
2248}
2249
2250/*
2251 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2252 */
44d3bd01 2253static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2254 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2255{
2256 int ret;
f6a9efaa 2257 struct ltt_ust_session *usess = session->ust_session;
bec39940 2258 struct lttng_ht *chan_ht;
f6a9efaa 2259
5d56b5aa 2260 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2261
aea829b3 2262 switch (domain) {
44d3bd01
DG		 2263 case LTTNG_DOMAIN_KERNEL:
2264 {
2265 struct ltt_kernel_channel *kchan;
54d01ffb 2266
44d3bd01
DG		 2267 kchan = trace_kernel_get_channel_by_name(attr->name,
2268 session->kernel_session);
2269 if (kchan == NULL) {
2270 ret = channel_kernel_create(session->kernel_session,
2271 attr, kernel_poll_pipe[1]);
2272 } else {
2273 ret = channel_kernel_enable(session->kernel_session, kchan);
2274 }
2275
2276 if (ret != LTTCOMM_OK) {
2277 goto error;
2278 }
2279
2280 kernel_wait_quiescent(kernel_tracer_fd);
2281 break;
2282 }
f6a9efaa
DG		 2283 case LTTNG_DOMAIN_UST:
2284 {
2285 struct ltt_ust_channel *uchan;
2286
7885e399 2287 chan_ht = usess->domain_global.channels;
f6a9efaa 2288
7885e399 2289 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2290 if (uchan == NULL) {
7885e399 2291 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2292 } else {
7885e399 2293 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2294 }
f6a9efaa
DG		 2295 break;
2296 }
d78d6610 2297#if 0
78f0bacd
DG		 2298 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2299 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2300 case LTTNG_DOMAIN_UST_PID:
d78d6610 2301#endif
44d3bd01
DG		 2302 default:
2303 ret = LTTCOMM_UNKNOWN_DOMAIN;
2304 goto error;
54d01ffb
DG		 2305 }
2306
54d01ffb
DG		 2307error:
2308 return ret;
2309}
2310
2311/*
2312 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2313 */
2314static int cmd_disable_event(struct ltt_session *session, int domain,
2315 char *channel_name, char *event_name)
2316{
2317 int ret;
54d01ffb
DG		 2318
2319 switch (domain) {
2320 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2321 {
2322 struct ltt_kernel_channel *kchan;
b0a40d28 2323 struct ltt_kernel_session *ksess;
2bdd86d4 2324
b0a40d28
DG		 2325 ksess = session->kernel_session;
2326
2327 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2328 if (kchan == NULL) {
2329 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2330 goto error;
d65106b1
DG		 2331 }
2332
b0a40d28 2333 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2334 if (ret != LTTCOMM_OK) {
2335 goto error;
2336 }
2337
2338 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2339 break;
2bdd86d4
MD		 2340 }
2341 case LTTNG_DOMAIN_UST:
b0a40d28 2342 {
b0a40d28 2343 struct ltt_ust_channel *uchan;
7f79d3a1 2344 struct ltt_ust_session *usess;
b0a40d28
DG		 2345
2346 usess = session->ust_session;
2347
2348 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2349 channel_name);
2350 if (uchan == NULL) {
2351 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2352 goto error;
2353 }
2354
7f79d3a1
DG		 2355 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2356 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2357 goto error;
2358 }
2359
7f79d3a1 2360 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2361 channel_name);
b0a40d28
DG		 2362 break;
2363 }
d78d6610 2364#if 0
2bdd86d4
MD		 2365 case LTTNG_DOMAIN_UST_EXEC_NAME:
2366 case LTTNG_DOMAIN_UST_PID:
2367 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2368#endif
54d01ffb 2369 default:
1ab1ea0b 2370 ret = LTTCOMM_UND;
54d01ffb 2371 goto error;
d65106b1 2372 }
26cc6b4e 2373
54d01ffb
DG		 2374 ret = LTTCOMM_OK;
2375
2376error:
2377 return ret;
2378}
2379
2380/*
2381 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2382 */
2383static int cmd_disable_event_all(struct ltt_session *session, int domain,
2384 char *channel_name)
2385{
2386 int ret;
54d01ffb
DG		 2387
2388 switch (domain) {
2389 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2390 {
2391 struct ltt_kernel_session *ksess;
2392 struct ltt_kernel_channel *kchan;
2393
2394 ksess = session->kernel_session;
2395
2396 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2397 if (kchan == NULL) {
2398 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2399 goto error;
26cc6b4e
DG		 2400 }
2401
9730260e 2402 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2403 if (ret != LTTCOMM_OK) {
0b97ec54 2404 goto error;
26cc6b4e
DG		 2405 }
2406
54d01ffb 2407 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2408 break;
9730260e
DG		 2409 }
2410 case LTTNG_DOMAIN_UST:
2411 {
2412 struct ltt_ust_session *usess;
2413 struct ltt_ust_channel *uchan;
2414
2415 usess = session->ust_session;
2416
2417 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2418 channel_name);
2419 if (uchan == NULL) {
2420 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2421 goto error;
2422 }
2423
7f79d3a1
DG		 2424 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2425 if (ret != 0) {
9730260e
DG		 2426 goto error;
2427 }
2428
7f79d3a1 2429 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2430
2431 break;
2432 }
d78d6610 2433#if 0
9730260e
DG		 2434 case LTTNG_DOMAIN_UST_EXEC_NAME:
2435 case LTTNG_DOMAIN_UST_PID:
2436 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2437#endif
54d01ffb 2438 default:
1ab1ea0b 2439 ret = LTTCOMM_UND;
54d01ffb 2440 goto error;
26cc6b4e 2441 }
e953ef25 2442
54d01ffb 2443 ret = LTTCOMM_OK;
e953ef25 2444
54d01ffb
DG		 2445error:
2446 return ret;
2447}
f5177a38 2448
54d01ffb
DG		 2449/*
2450 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2451 */
2452static int cmd_add_context(struct ltt_session *session, int domain,
2453 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2454{
2455 int ret;
f5177a38 2456
54d01ffb
DG		 2457 switch (domain) {
2458 case LTTNG_DOMAIN_KERNEL:
2459 /* Add kernel context to kernel tracer */
2460 ret = context_kernel_add(session->kernel_session, ctx,
2461 event_name, channel_name);
2462 if (ret != LTTCOMM_OK) {
f5177a38 2463 goto error;
e953ef25 2464 }
2bdd86d4
MD		 2465 break;
2466 case LTTNG_DOMAIN_UST:
2467 {
55cc08a6 2468 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2469
55cc08a6
DG		 2470 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2471 if (ret != LTTCOMM_OK) {
2472 goto error;
2bdd86d4 2473 }
e953ef25 2474 break;
2bdd86d4 2475 }
d78d6610 2476#if 0
55cc08a6
DG		 2477 case LTTNG_DOMAIN_UST_EXEC_NAME:
2478 case LTTNG_DOMAIN_UST_PID:
2479 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2480#endif
54d01ffb 2481 default:
1ab1ea0b 2482 ret = LTTCOMM_UND;
54d01ffb 2483 goto error;
e953ef25 2484 }
950131af 2485
54d01ffb 2486 ret = LTTCOMM_OK;
950131af 2487
54d01ffb
DG		 2488error:
2489 return ret;
2490}
2491
2492/*
2493 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2494 */
2495static int cmd_enable_event(struct ltt_session *session, int domain,
2496 char *channel_name, struct lttng_event *event)
2497{
2498 int ret;
f6cd6b0f 2499 struct lttng_channel *attr;
48842b30 2500 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2501
2502 switch (domain) {
2503 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2504 {
2505 struct ltt_kernel_channel *kchan;
2506
54d01ffb
DG		 2507 kchan = trace_kernel_get_channel_by_name(channel_name,
2508 session->kernel_session);
2509 if (kchan == NULL) {
f6cd6b0f
DG		 2510 attr = channel_new_default_attr(domain);
2511 if (attr == NULL) {
2512 ret = LTTCOMM_FATAL;
2513 goto error;
2514 }
2515 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2516
54d01ffb 2517 /* This call will notify the kernel thread */
44d3bd01 2518 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2519 attr, kernel_poll_pipe[1]);
54d01ffb 2520 if (ret != LTTCOMM_OK) {
ff4d74e6 2521 free(attr);
f5177a38
DG		 2522 goto error;
2523 }
ff4d74e6 2524 free(attr);
54d01ffb 2525 }
950131af 2526
54d01ffb
DG		 2527 /* Get the newly created kernel channel pointer */
2528 kchan = trace_kernel_get_channel_by_name(channel_name,
2529 session->kernel_session);
2530 if (kchan == NULL) {
2531 /* This sould not happen... */
2532 ret = LTTCOMM_FATAL;
2533 goto error;
2534 }
f5177a38 2535
48842b30
DG		 2536 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2537 event);
54d01ffb 2538 if (ret != LTTCOMM_OK) {
f5177a38 2539 goto error;
950131af
DG		 2540 }
2541
54d01ffb 2542 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2543 break;
2bdd86d4
MD		 2544 }
2545 case LTTNG_DOMAIN_UST:
2546 {
aea829b3 2547 struct lttng_channel *attr;
48842b30 2548 struct ltt_ust_channel *uchan;
2bdd86d4 2549
edb67388 2550 /* Get channel from global UST domain */
48842b30
DG		 2551 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2552 channel_name);
2553 if (uchan == NULL) {
aea829b3
DG		 2554 /* Create default channel */
2555 attr = channel_new_default_attr(domain);
2556 if (attr == NULL) {
2557 ret = LTTCOMM_FATAL;
2558 goto error;
2559 }
596219f7 2560 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2561 attr->name[NAME_MAX - 1] = '\0';
2bdd86d4 2562
7885e399 2563 ret = channel_ust_create(usess, domain, attr);
edb67388 2564 if (ret != LTTCOMM_OK) {
ff4d74e6 2565 free(attr);
aea829b3
DG		 2566 goto error;
2567 }
aea829b3
DG		 2568 free(attr);
2569
2570 /* Get the newly created channel reference back */
2571 uchan = trace_ust_find_channel_by_name(
2572 usess->domain_global.channels, channel_name);
2573 if (uchan == NULL) {
2574 /* Something is really wrong */
2bdd86d4
MD		 2575 ret = LTTCOMM_FATAL;
2576 goto error;
2577 }
48842b30 2578 }
2bdd86d4 2579
edb67388 2580 /* At this point, the session and channel exist on the tracer */
edb67388
DG		 2581 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2582 if (ret != LTTCOMM_OK) {
48842b30 2583 goto error;
2bdd86d4
MD		 2584 }
2585 break;
2586 }
d78d6610 2587#if 0
2bdd86d4
MD		 2588 case LTTNG_DOMAIN_UST_EXEC_NAME:
2589 case LTTNG_DOMAIN_UST_PID:
2590 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2591#endif
54d01ffb 2592 default:
1ab1ea0b 2593 ret = LTTCOMM_UND;
54d01ffb 2594 goto error;
950131af 2595 }
d36b8583 2596
54d01ffb 2597 ret = LTTCOMM_OK;
d36b8583 2598
54d01ffb
DG		 2599error:
2600 return ret;
2601}
7d29a247 2602
54d01ffb
DG		 2603/*
2604 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2605 */
2606static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2607 char *channel_name, int event_type)
54d01ffb
DG		 2608{
2609 int ret;
2610 struct ltt_kernel_channel *kchan;
7d29a247 2611
54d01ffb
DG		 2612 switch (domain) {
2613 case LTTNG_DOMAIN_KERNEL:
2614 kchan = trace_kernel_get_channel_by_name(channel_name,
2615 session->kernel_session);
2616 if (kchan == NULL) {
2617 /* This call will notify the kernel thread */
44d3bd01
DG		 2618 ret = channel_kernel_create(session->kernel_session, NULL,
2619 kernel_poll_pipe[1]);
54d01ffb
DG		 2620 if (ret != LTTCOMM_OK) {
2621 goto error;
d36b8583 2622 }
0d0c377a 2623
8f69e5eb
DG		 2624 /* Get the newly created kernel channel pointer */
2625 kchan = trace_kernel_get_channel_by_name(channel_name,
2626 session->kernel_session);
2627 if (kchan == NULL) {
2628 /* This sould not happen... */
2629 ret = LTTCOMM_FATAL;
2630 goto error;
2631 }
2632
54d01ffb 2633 }
0fdd1e2c 2634
7a3d1328 2635 switch (event_type) {
76d45b40 2636 case LTTNG_EVENT_SYSCALL:
7a3d1328 2637 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2638 kchan, kernel_tracer_fd);
7a3d1328 2639 break;
76d45b40 2640 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2641 /*
7a3d1328
MD		 2642 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2643 * events already registered to the channel.
8c9ae521 2644 */
7a3d1328
MD		 2645 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2646 kchan, kernel_tracer_fd);
2647 break;
76d45b40 2648 case LTTNG_EVENT_ALL:
7a3d1328 2649 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2650 ret = event_kernel_enable_all(session->kernel_session,
2651 kchan, kernel_tracer_fd);
7a3d1328
MD		 2652 break;
2653 default:
2654 ret = LTTCOMM_KERN_ENABLE_FAIL;
2655 goto error;
8c9ae521 2656 }
8f69e5eb
DG		 2657
2658 /* Manage return value */
54d01ffb 2659 if (ret != LTTCOMM_OK) {
0d0c377a 2660 goto error;
d36b8583
DG		 2661 }
2662
54d01ffb 2663 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2664 break;
76d45b40
DG		 2665 case LTTNG_DOMAIN_UST:
2666 {
2667 struct lttng_channel *attr;
2668 struct ltt_ust_channel *uchan;
2669 struct ltt_ust_session *usess = session->ust_session;
2670
2671 /* Get channel from global UST domain */
2672 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2673 channel_name);
2674 if (uchan == NULL) {
2675 /* Create default channel */
2676 attr = channel_new_default_attr(domain);
2677 if (attr == NULL) {
2678 ret = LTTCOMM_FATAL;
2679 goto error;
2680 }
2681 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2682 attr->name[NAME_MAX - 1] = '\0';
2683
2684 /* Use the internal command enable channel */
7885e399 2685 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2686 if (ret != LTTCOMM_OK) {
2687 free(attr);
2688 goto error;
2689 }
2690 free(attr);
2691
2692 /* Get the newly created channel reference back */
2693 uchan = trace_ust_find_channel_by_name(
2694 usess->domain_global.channels, channel_name);
2695 if (uchan == NULL) {
2696 /* Something is really wrong */
2697 ret = LTTCOMM_FATAL;
2698 goto error;
2699 }
2700 }
2701
2702 /* At this point, the session and channel exist on the tracer */
2703
2704 switch (event_type) {
2705 case LTTNG_EVENT_ALL:
2706 case LTTNG_EVENT_TRACEPOINT:
2707 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2708 if (ret != LTTCOMM_OK) {
2709 goto error;
2710 }
2711 break;
2712 default:
2713 ret = LTTCOMM_UST_ENABLE_FAIL;
2714 goto error;
2715 }
2716
2717 /* Manage return value */
2718 if (ret != LTTCOMM_OK) {
2719 goto error;
2720 }
2721
2722 break;
2723 }
d78d6610 2724#if 0
76d45b40
DG		 2725 case LTTNG_DOMAIN_UST_EXEC_NAME:
2726 case LTTNG_DOMAIN_UST_PID:
2727 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2728#endif
54d01ffb 2729 default:
1ab1ea0b 2730 ret = LTTCOMM_UND;
54d01ffb 2731 goto error;
d36b8583 2732 }
f3ed775e 2733
54d01ffb
DG		 2734 ret = LTTCOMM_OK;
2735
2736error:
2737 return ret;
2738}
2739
2740/*
2741 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2742 */
2743static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2744{
2745 int ret;
2746 ssize_t nb_events = 0;
2747
2748 switch (domain) {
2749 case LTTNG_DOMAIN_KERNEL:
2750 nb_events = kernel_list_events(kernel_tracer_fd, events);
2751 if (nb_events < 0) {
2752 ret = LTTCOMM_KERN_LIST_FAIL;
2753 goto error;
894be886 2754 }
54d01ffb 2755 break;
b551a063
DG		 2756 case LTTNG_DOMAIN_UST:
2757 nb_events = ust_app_list_events(events);
2758 if (nb_events < 0) {
2759 ret = LTTCOMM_UST_LIST_FAIL;
2760 goto error;
2761 }
2762 break;
54d01ffb 2763 default:
1ab1ea0b 2764 ret = LTTCOMM_UND;
54d01ffb
DG		 2765 goto error;
2766 }
894be886 2767
54d01ffb 2768 return nb_events;
7d29a247 2769
54d01ffb
DG		 2770error:
2771 /* Return negative value to differentiate return code */
2772 return -ret;
2773}
b389abbe 2774
54d01ffb
DG		 2775/*
2776 * Command LTTNG_START_TRACE processed by the client thread.
2777 */
2778static int cmd_start_trace(struct ltt_session *session)
2779{
2780 int ret;
54d01ffb 2781 struct ltt_kernel_session *ksession;
b9d9b220 2782 struct ltt_ust_session *usess;
b389abbe 2783
54d01ffb
DG		 2784 /* Short cut */
2785 ksession = session->kernel_session;
b9d9b220 2786 usess = session->ust_session;
5eb91c98 2787
b9ef1c83
DG		 2788 if (session->enabled) {
2789 ret = LTTCOMM_UST_START_FAIL;
2790 goto error;
2791 }
2792
464dd62d 2793 session->enabled = 1;
5eb91c98 2794
54d01ffb
DG		 2795 /* Kernel tracing */
2796 if (ksession != NULL) {
2bdd86d4
MD		 2797 struct ltt_kernel_channel *kchan;
2798
54d01ffb
DG		 2799 /* Open kernel metadata */
2800 if (ksession->metadata == NULL) {
2801 ret = kernel_open_metadata(ksession, ksession->trace_path);
2802 if (ret < 0) {
2803 ret = LTTCOMM_KERN_META_FAIL;
2804 goto error;
b389abbe 2805 }
54d01ffb 2806 }
7d29a247 2807
54d01ffb
DG		 2808 /* Open kernel metadata stream */
2809 if (ksession->metadata_stream_fd == 0) {
2810 ret = kernel_open_metadata_stream(ksession);
2811 if (ret < 0) {
2812 ERR("Kernel create metadata stream failed");
2813 ret = LTTCOMM_KERN_STREAM_FAIL;
2814 goto error;
2815 }
2816 }
2817
2818 /* For each channel */
2819 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2820 if (kchan->stream_count == 0) {
2821 ret = kernel_open_channel_stream(kchan);
2822 if (ret < 0) {
2823 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2824 goto error;
2825 }
54d01ffb
DG		 2826 /* Update the stream global counter */
2827 ksession->stream_count_global += ret;
7d29a247 2828 }
54d01ffb
DG		 2829 }
2830
2831 /* Setup kernel consumer socket and send fds to it */
2832 ret = init_kernel_tracing(ksession);
2833 if (ret < 0) {
2834 ret = LTTCOMM_KERN_START_FAIL;
2835 goto error;
2836 }
2837
2838 /* This start the kernel tracing */
2839 ret = kernel_start_session(ksession);
2840 if (ret < 0) {
2841 ret = LTTCOMM_KERN_START_FAIL;
2842 goto error;
2843 }
2844
2845 /* Quiescent wait after starting trace */
2846 kernel_wait_quiescent(kernel_tracer_fd);
2847 }
2848
36dc12cc 2849 /* Flag session that trace should start automatically */
b9d9b220
DG		 2850 if (usess) {
2851 usess->start_trace = 1;
36dc12cc 2852
b9d9b220
DG		 2853 ret = ust_app_start_trace_all(usess);
2854 if (ret < 0) {
2855 ret = LTTCOMM_UST_START_FAIL;
2856 goto error;
2857 }
2bdd86d4 2858 }
54d01ffb
DG		 2859
2860 ret = LTTCOMM_OK;
2861
2862error:
2863 return ret;
2864}
2865
2866/*
2867 * Command LTTNG_STOP_TRACE processed by the client thread.
2868 */
2869static int cmd_stop_trace(struct ltt_session *session)
2870{
2871 int ret;
2872 struct ltt_kernel_channel *kchan;
2873 struct ltt_kernel_session *ksession;
8be98f9a 2874 struct ltt_ust_session *usess;
54d01ffb
DG		 2875
2876 /* Short cut */
2877 ksession = session->kernel_session;
8be98f9a 2878 usess = session->ust_session;
54d01ffb 2879
b9ef1c83 2880 if (!session->enabled) {
190df5ac 2881 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG		 2882 goto error;
2883 }
2884
464dd62d 2885 session->enabled = 0;
54d01ffb
DG		 2886
2887 /* Kernel tracer */
2888 if (ksession != NULL) {
2889 DBG("Stop kernel tracing");
2890
2891 /* Flush all buffers before stopping */
2892 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2893 if (ret < 0) {
2894 ERR("Kernel metadata flush failed");
2895 }
f34daff7 2896
54d01ffb
DG		 2897 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2898 ret = kernel_flush_buffer(kchan);
0d0c377a 2899 if (ret < 0) {
54d01ffb 2900 ERR("Kernel flush buffer error");
7d29a247 2901 }
54d01ffb 2902 }
19e70852 2903
54d01ffb
DG		 2904 ret = kernel_stop_session(ksession);
2905 if (ret < 0) {
2906 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2907 goto error;
f3ed775e 2908 }
54d01ffb
DG		 2909
2910 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2911 }
54d01ffb 2912
8be98f9a
MD		 2913 if (usess) {
2914 usess->start_trace = 0;
2bdd86d4 2915
8be98f9a 2916 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2917 if (ret < 0) {
190df5ac 2918 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD		 2919 goto error;
2920 }
2bdd86d4 2921 }
54d01ffb
DG		 2922
2923 ret = LTTCOMM_OK;
2924
2925error:
2926 return ret;
2927}
2928
2929/*
2930 * Command LTTNG_CREATE_SESSION processed by the client thread.
2931 */
6df2e2c9 2932static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG		 2933{
2934 int ret;
2935
6df2e2c9 2936 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG		 2937 if (ret != LTTCOMM_OK) {
2938 goto error;
2939 }
2940
2941 ret = LTTCOMM_OK;
2942
2943error:
2944 return ret;
2945}
2946
2947/*
2948 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2949 */
2950static int cmd_destroy_session(struct ltt_session *session, char *name)
2951{
2952 int ret;
2953
2954 /* Clean kernel session teardown */
2955 teardown_kernel_session(session);
84cd17c6
MD		 2956 /* UST session teardown */
2957 teardown_ust_session(session);
54d01ffb
DG		 2958
2959 /*
2960 * Must notify the kernel thread here to update it's poll setin order
2961 * to remove the channel(s)' fd just destroyed.
2962 */
2963 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2964 if (ret < 0) {
2965 perror("write kernel poll pipe");
2966 }
2967
271933a4 2968 ret = session_destroy(session);
54d01ffb
DG		 2969
2970 return ret;
2971}
2972
2973/*
2974 * Command LTTNG_CALIBRATE processed by the client thread.
2975 */
2976static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2977{
2978 int ret;
2979
2980 switch (domain) {
2981 case LTTNG_DOMAIN_KERNEL:
33a2b854 2982 {
54d01ffb 2983 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2984
54d01ffb
DG		 2985 kcalibrate.type = calibrate->type;
2986 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2987 if (ret < 0) {
54d01ffb
DG		 2988 ret = LTTCOMM_KERN_ENABLE_FAIL;
2989 goto error;
33a2b854 2990 }
54d01ffb
DG		 2991 break;
2992 }
4466912f
DG		 2993 case LTTNG_DOMAIN_UST:
2994 {
2995 struct lttng_ust_calibrate ucalibrate;
2996
2997 ucalibrate.type = calibrate->type;
2998 ret = ust_app_calibrate_glb(&ucalibrate);
2999 if (ret < 0) {
3000 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3001 goto error;
3002 }
3003 break;
3004 }
54d01ffb 3005 default:
1ab1ea0b 3006 ret = LTTCOMM_UND;
54d01ffb
DG		 3007 goto error;
3008 }
33a2b854 3009
54d01ffb 3010 ret = LTTCOMM_OK;
33a2b854 3011
54d01ffb
DG		 3012error:
3013 return ret;
3014}
7d29a247 3015
54d01ffb
DG		 3016/*
3017 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3018 */
3019static int cmd_register_consumer(struct ltt_session *session, int domain,
3020 char *sock_path)
3021{
3022 int ret, sock;
b389abbe 3023
54d01ffb
DG		 3024 switch (domain) {
3025 case LTTNG_DOMAIN_KERNEL:
3026 /* Can't register a consumer if there is already one */
48c4f28c 3027 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 3028 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3029 goto error;
3030 }
3031
3032 sock = lttcomm_connect_unix_sock(sock_path);
3033 if (sock < 0) {
3034 ret = LTTCOMM_CONNECT_FAIL;
3035 goto error;
3036 }
3037
3038 session->kernel_session->consumer_fd = sock;
3039 break;
3040 default:
3041 /* TODO: Userspace tracing */
1ab1ea0b 3042 ret = LTTCOMM_UND;
54d01ffb
DG		 3043 goto error;
3044 }
3045
3046 ret = LTTCOMM_OK;
3047
3048error:
3049 return ret;
3050}
3051
3052/*
3053 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3054 */
3055static ssize_t cmd_list_domains(struct ltt_session *session,
3056 struct lttng_domain **domains)
3057{
b551a063 3058 int ret, index = 0;
54d01ffb
DG		 3059 ssize_t nb_dom = 0;
3060
3061 if (session->kernel_session != NULL) {
b551a063 3062 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3063 nb_dom++;
3064 }
3065
b551a063
DG		 3066 if (session->ust_session != NULL) {
3067 DBG3("Listing domains found UST global domain");
3068 nb_dom++;
3069 }
54d01ffb 3070
b551a063 3071 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3072 if (*domains == NULL) {
3073 ret = -LTTCOMM_FATAL;
3074 goto error;
3075 }
3076
b551a063
DG		 3077 if (session->kernel_session != NULL) {
3078 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3079 index++;
3080 }
3081
3082 if (session->ust_session != NULL) {
3083 (*domains)[index].type = LTTNG_DOMAIN_UST;
3084 index++;
3085 }
54d01ffb 3086
54d01ffb
DG		 3087 return nb_dom;
3088
3089error:
3090 return ret;
3091}
3092
3093/*
3094 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3095 */
b551a063 3096static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3097 struct lttng_channel **channels)
3098{
3099 int ret;
3100 ssize_t nb_chan = 0;
3101
b551a063
DG		 3102 switch (domain) {
3103 case LTTNG_DOMAIN_KERNEL:
3104 if (session->kernel_session != NULL) {
3105 nb_chan = session->kernel_session->channel_count;
3106 }
0df502fd 3107 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3108 break;
3109 case LTTNG_DOMAIN_UST:
3110 if (session->ust_session != NULL) {
bec39940 3111 nb_chan = lttng_ht_get_count(
b551a063
DG		 3112 session->ust_session->domain_global.channels);
3113 }
0df502fd 3114 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3115 break;
3116 default:
3117 *channels = NULL;
1ab1ea0b 3118 ret = -LTTCOMM_UND;
54d01ffb
DG		 3119 goto error;
3120 }
3121
b551a063
DG		 3122 if (nb_chan > 0) {
3123 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3124 if (*channels == NULL) {
3125 ret = -LTTCOMM_FATAL;
3126 goto error;
3127 }
54d01ffb 3128
b551a063
DG		 3129 list_lttng_channels(domain, session, *channels);
3130 } else {
3131 *channels = NULL;
3132 }
2bdd86d4 3133
54d01ffb
DG		 3134 return nb_chan;
3135
3136error:
3137 return ret;
3138}
3139
3140/*
3141 * Command LTTNG_LIST_EVENTS processed by the client thread.
3142 */
b551a063 3143static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3144 char *channel_name, struct lttng_event **events)
3145{
b551a063 3146 int ret = 0;
54d01ffb 3147 ssize_t nb_event = 0;
54d01ffb 3148
b551a063
DG		 3149 switch (domain) {
3150 case LTTNG_DOMAIN_KERNEL:
3151 if (session->kernel_session != NULL) {
3152 nb_event = list_lttng_kernel_events(channel_name,
3153 session->kernel_session, events);
54d01ffb 3154 }
b551a063
DG		 3155 break;
3156 case LTTNG_DOMAIN_UST:
3157 {
3158 if (session->ust_session != NULL) {
3159 nb_event = list_lttng_ust_global_events(channel_name,
3160 &session->ust_session->domain_global, events);
54d01ffb 3161 }
b551a063 3162 break;
54d01ffb 3163 }
b551a063 3164 default:
1ab1ea0b 3165 ret = -LTTCOMM_UND;
54d01ffb
DG		 3166 goto error;
3167 }
3168
b551a063 3169 ret = nb_event;
54d01ffb
DG		 3170
3171error:
3172 return ret;
3173}
3174
3175/*
3176 * Process the command requested by the lttng client within the command
3177 * context structure. This function make sure that the return structure (llm)
3178 * is set and ready for transmission before returning.
3179 *
3180 * Return any error encountered or 0 for success.
3181 */
3182static int process_client_msg(struct command_ctx *cmd_ctx)
3183{
3184 int ret = LTTCOMM_OK;
44d3bd01 3185 int need_tracing_session = 1;
54d01ffb
DG		 3186
3187 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3188
4fba7219
DG		 3189 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3190 ret = LTTCOMM_KERN_NA;
3191 goto error;
3192 }
3193
54d01ffb
DG		 3194 /*
3195 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3196 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3197 * command.
3198 */
3199 switch(cmd_ctx->lsm->cmd_type) {
3200 case LTTNG_LIST_SESSIONS:
3201 case LTTNG_LIST_TRACEPOINTS:
3202 case LTTNG_LIST_DOMAINS:
3203 case LTTNG_LIST_CHANNELS:
3204 case LTTNG_LIST_EVENTS:
3205 break;
3206 default:
3207 /* Setup lttng message with no payload */
3208 ret = setup_lttng_msg(cmd_ctx, 0);
3209 if (ret < 0) {
3210 /* This label does not try to unlock the session */
3211 goto init_setup_error;
3212 }
3213 }
3214
3215 /* Commands that DO NOT need a session. */
3216 switch (cmd_ctx->lsm->cmd_type) {
3217 case LTTNG_CALIBRATE:
3218 case LTTNG_CREATE_SESSION:
3219 case LTTNG_LIST_SESSIONS:
3220 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3221 need_tracing_session = 0;
54d01ffb
DG		 3222 break;
3223 default:
3224 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3225 session_lock_list();
54d01ffb 3226 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3227 session_unlock_list();
54d01ffb
DG		 3228 if (cmd_ctx->session == NULL) {
3229 if (cmd_ctx->lsm->session.name != NULL) {
3230 ret = LTTCOMM_SESS_NOT_FOUND;
3231 } else {
3232 /* If no session name specified */
3233 ret = LTTCOMM_SELECT_SESS;
3234 }
3235 goto error;
3236 } else {
3237 /* Acquire lock for the session */
3238 session_lock(cmd_ctx->session);
3239 }
3240 break;
3241 }
b389abbe 3242
54d01ffb
DG		 3243 /*
3244 * Check domain type for specific "pre-action".
3245 */
3246 switch (cmd_ctx->lsm->domain.type) {
3247 case LTTNG_DOMAIN_KERNEL:
d1f1c568
DG		 3248 if (!is_root) {
3249 ret = LTTCOMM_KERN_NA;
3250 goto error;
3251 }
3252
54d01ffb
DG		 3253 /* Kernel tracer check */
3254 if (kernel_tracer_fd == 0) {
3255 /* Basically, load kernel tracer modules */
096102bd
DG		 3256 ret = init_kernel_tracer();
3257 if (ret != 0) {
54d01ffb
DG		 3258 goto error;
3259 }
3260 }
5eb91c98 3261
54d01ffb 3262 /* Need a session for kernel command */
44d3bd01 3263 if (need_tracing_session) {
54d01ffb
DG		 3264 if (cmd_ctx->session->kernel_session == NULL) {
3265 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3266 if (ret < 0) {
54d01ffb 3267 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3268 goto error;
3269 }
b389abbe 3270 }
7d29a247 3271
54d01ffb 3272 /* Start the kernel consumer daemon */
3bd1e081
MD		 3273 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3274 if (kconsumer_data.pid == 0 &&
54d01ffb 3275 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3276 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3277 ret = start_consumerd(&kconsumer_data);
7d29a247 3278 if (ret < 0) {
54d01ffb
DG		 3279 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3280 goto error;
950131af 3281 }
3ff2ecac
MD		 3282 } else {
3283 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3284 }
0d0c377a 3285 }
54d01ffb 3286 break;
2bdd86d4 3287 case LTTNG_DOMAIN_UST:
44d3bd01 3288 {
44d3bd01 3289 if (need_tracing_session) {
f6a9efaa 3290 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG		 3291 ret = create_ust_session(cmd_ctx->session,
3292 &cmd_ctx->lsm->domain);
3293 if (ret != LTTCOMM_OK) {
3294 goto error;
3295 }
3296 }
7753dea8
MD		 3297 /* Start the UST consumer daemons */
3298 /* 64-bit */
3299 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3300 if (consumerd64_bin[0] != '\0' &&
7753dea8 3301 ustconsumer64_data.pid == 0 &&
2bdd86d4 3302 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3303 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3304 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3305 if (ret < 0) {
7753dea8
MD		 3306 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3307 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3308 goto error;
3309 }
48842b30 3310
7753dea8 3311 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3312 } else {
7753dea8
MD		 3313 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3314 }
3315 /* 32-bit */
fc7a59ce 3316 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3317 ustconsumer32_data.pid == 0 &&
3318 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3319 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3320 ret = start_consumerd(&ustconsumer32_data);
3321 if (ret < 0) {
3322 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3323 ust_consumerd32_fd = -EINVAL;
3324 goto error;
3325 }
3326 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3327 } else {
3328 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3329 }
44d3bd01
DG		 3330 }
3331 break;
3332 }
54d01ffb 3333 default:
54d01ffb
DG		 3334 break;
3335 }
33a2b854 3336
8e0af1b4
MD		 3337 /*
3338 * Check that the UID or GID match that of the tracing session.
3339 * The root user can interact with all sessions.
3340 */
3341 if (need_tracing_session) {
3342 if (!session_access_ok(cmd_ctx->session,
3343 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3344 ret = LTTCOMM_EPERM;
3345 goto error;
3346 }
3347 }
3348
54d01ffb
DG		 3349 /* Process by command type */
3350 switch (cmd_ctx->lsm->cmd_type) {
3351 case LTTNG_ADD_CONTEXT:
3352 {
3353 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3354 cmd_ctx->lsm->u.context.channel_name,
3355 cmd_ctx->lsm->u.context.event_name,
3356 &cmd_ctx->lsm->u.context.ctx);
3357 break;
3358 }
3359 case LTTNG_DISABLE_CHANNEL:
3360 {
3361 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3362 cmd_ctx->lsm->u.disable.channel_name);
3363 break;
3364 }
3365 case LTTNG_DISABLE_EVENT:
3366 {
3367 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3368 cmd_ctx->lsm->u.disable.channel_name,
3369 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3370 break;
3371 }
54d01ffb
DG		 3372 case LTTNG_DISABLE_ALL_EVENT:
3373 {
2bdd86d4 3374 DBG("Disabling all events");
54d01ffb
DG		 3375
3376 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3377 cmd_ctx->lsm->u.disable.channel_name);
3378 break;
3379 }
3380 case LTTNG_ENABLE_CHANNEL:
3381 {
aea829b3 3382 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3383 &cmd_ctx->lsm->u.channel.chan);
3384 break;
3385 }
3386 case LTTNG_ENABLE_EVENT:
3387 {
3388 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3389 cmd_ctx->lsm->u.enable.channel_name,
3390 &cmd_ctx->lsm->u.enable.event);
3391 break;
3392 }
3393 case LTTNG_ENABLE_ALL_EVENT:
3394 {
2bdd86d4 3395 DBG("Enabling all events");
54d01ffb
DG		 3396
3397 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3398 cmd_ctx->lsm->u.enable.channel_name,
3399 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3400 break;
3401 }
052da939 3402 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3403 {
9f19cc17 3404 struct lttng_event *events;
54d01ffb 3405 ssize_t nb_events;
052da939 3406
54d01ffb
DG		 3407 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3408 if (nb_events < 0) {
3409 ret = -nb_events;
3410 goto error;
2ef84c95
DG		 3411 }
3412
3413 /*
3414 * Setup lttng message with payload size set to the event list size in
3415 * bytes and then copy list into the llm payload.
3416 */
052da939 3417 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3418 if (ret < 0) {
052da939 3419 free(events);
2ef84c95
DG		 3420 goto setup_error;
3421 }
3422
3423 /* Copy event list into message payload */
9f19cc17 3424 memcpy(cmd_ctx->llm->payload, events,
052da939 3425 sizeof(struct lttng_event) * nb_events);
2ef84c95 3426
9f19cc17 3427 free(events);
2ef84c95
DG		 3428
3429 ret = LTTCOMM_OK;
3430 break;
3431 }
f3ed775e 3432 case LTTNG_START_TRACE:
8c0faa1d 3433 {
54d01ffb 3434 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3435 break;
3436 }
f3ed775e 3437 case LTTNG_STOP_TRACE:
8c0faa1d 3438 {
54d01ffb 3439 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3440 break;
3441 }
5e16da05
MD		 3442 case LTTNG_CREATE_SESSION:
3443 {
3c6bae61 3444 tracepoint(create_session_start);
54d01ffb 3445 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3446 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3c6bae61 3447 tracepoint(create_session_end);
5e16da05
MD		 3448 break;
3449 }
3450 case LTTNG_DESTROY_SESSION:
3451 {
3c6bae61 3452 tracepoint(destroy_session_start);
54d01ffb
DG		 3453 ret = cmd_destroy_session(cmd_ctx->session,
3454 cmd_ctx->lsm->session.name);
3c6bae61 3455 tracepoint(destroy_session_end);
5461b305 3456 break;
5e16da05 3457 }
9f19cc17 3458 case LTTNG_LIST_DOMAINS:
5e16da05 3459 {
54d01ffb
DG		 3460 ssize_t nb_dom;
3461 struct lttng_domain *domains;
5461b305 3462
54d01ffb
DG		 3463 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3464 if (nb_dom < 0) {
3465 ret = -nb_dom;
3466 goto error;
ce3d728c 3467 }
520ff687 3468
54d01ffb 3469 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3470 if (ret < 0) {
3471 goto setup_error;
520ff687 3472 }
57167058 3473
54d01ffb
DG		 3474 /* Copy event list into message payload */
3475 memcpy(cmd_ctx->llm->payload, domains,
3476 nb_dom * sizeof(struct lttng_domain));
3477
3478 free(domains);
5e16da05 3479
5461b305 3480 ret = LTTCOMM_OK;
5e16da05
MD		 3481 break;
3482 }
9f19cc17 3483 case LTTNG_LIST_CHANNELS:
5e16da05 3484 {
54d01ffb
DG		 3485 size_t nb_chan;
3486 struct lttng_channel *channels;
3487
b551a063
DG		 3488 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3489 cmd_ctx->session, &channels);
54d01ffb
DG		 3490 if (nb_chan < 0) {
3491 ret = -nb_chan;
3492 goto error;
5461b305 3493 }
ca95a216 3494
54d01ffb 3495 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3496 if (ret < 0) {
3497 goto setup_error;
3498 }
9f19cc17 3499
54d01ffb
DG		 3500 /* Copy event list into message payload */
3501 memcpy(cmd_ctx->llm->payload, channels,
3502 nb_chan * sizeof(struct lttng_channel));
3503
3504 free(channels);
9f19cc17
DG		 3505
3506 ret = LTTCOMM_OK;
5461b305 3507 break;
5e16da05 3508 }
9f19cc17 3509 case LTTNG_LIST_EVENTS:
5e16da05 3510 {
b551a063 3511 ssize_t nb_event;
684d34d2 3512 struct lttng_event *events = NULL;
9f19cc17 3513
b551a063 3514 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3515 cmd_ctx->lsm->u.list.channel_name, &events);
3516 if (nb_event < 0) {
3517 ret = -nb_event;
3518 goto error;
5461b305 3519 }
ca95a216 3520
54d01ffb 3521 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3522 if (ret < 0) {
3523 goto setup_error;
3524 }
9f19cc17 3525
54d01ffb
DG		 3526 /* Copy event list into message payload */
3527 memcpy(cmd_ctx->llm->payload, events,
3528 nb_event * sizeof(struct lttng_event));
9f19cc17 3529
54d01ffb 3530 free(events);
9f19cc17
DG		 3531
3532 ret = LTTCOMM_OK;
5461b305 3533 break;
5e16da05
MD		 3534 }
3535 case LTTNG_LIST_SESSIONS:
3536 {
8e0af1b4 3537 unsigned int nr_sessions;
5461b305 3538
8e0af1b4
MD		 3539 session_lock_list();
3540 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3541 if (nr_sessions == 0) {
f3ed775e 3542 ret = LTTCOMM_NO_SESSION;
54d01ffb 3543 session_unlock_list();
5461b305 3544 goto error;
57167058 3545 }
8e0af1b4 3546 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3547 if (ret < 0) {
54d01ffb 3548 session_unlock_list();
5461b305 3549 goto setup_error;
e065084a 3550 }
5e16da05 3551
6c9cc2ab 3552 /* Filled the session array */
8e0af1b4
MD		 3553 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3554 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
6c9cc2ab 3555
54d01ffb 3556 session_unlock_list();
5e16da05 3557
5461b305 3558 ret = LTTCOMM_OK;
5e16da05
MD		 3559 break;
3560 }
d0254c7c
MD		 3561 case LTTNG_CALIBRATE:
3562 {
54d01ffb
DG		 3563 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3564 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3565 break;
3566 }
d9800920
DG		 3567 case LTTNG_REGISTER_CONSUMER:
3568 {
54d01ffb
DG		 3569 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3570 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3571 break;
3572 }
5e16da05 3573 default:
5e16da05 3574 ret = LTTCOMM_UND;
5461b305 3575 break;
fac6795d
DG		 3576 }
3577
5461b305 3578error:
5461b305
DG		 3579 if (cmd_ctx->llm == NULL) {
3580 DBG("Missing llm structure. Allocating one.");
894be886 3581 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3582 goto setup_error;
3583 }
3584 }
54d01ffb 3585 /* Set return code */
5461b305 3586 cmd_ctx->llm->ret_code = ret;
5461b305 3587setup_error:
b5541356 3588 if (cmd_ctx->session) {
54d01ffb 3589 session_unlock(cmd_ctx->session);
b5541356 3590 }
54d01ffb 3591init_setup_error:
8028d920 3592 return ret;
fac6795d
DG		 3593}
3594
1d4b027a 3595/*
d063d709
DG		 3596 * This thread manage all clients request using the unix client socket for
3597 * communication.
1d4b027a
DG		 3598 */
3599static void *thread_manage_clients(void *data)
3600{
5eb91c98
DG		 3601 int sock = 0, ret, i, pollfd;
3602 uint32_t revents, nb_fd;
273ea72c 3603 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3604 struct lttng_poll_event events;
1d4b027a 3605
b25a8868
DG		 3606 tracepoint(sessiond_th_cli_start);
3607
1d4b027a
DG		 3608 DBG("[thread] Manage client started");
3609
f6a9efaa
DG		 3610 rcu_register_thread();
3611
1d4b027a
DG		 3612 ret = lttcomm_listen_unix_sock(client_sock);
3613 if (ret < 0) {
3614 goto error;
3615 }
3616
5eb91c98
DG		 3617 /*
3618 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3619 * more will be added to this poll set.
3620 */
3621 ret = create_thread_poll_set(&events, 2);
3622 if (ret < 0) {
3623 goto error;
3624 }
273ea72c 3625
5eb91c98
DG		 3626 /* Add the application registration socket */
3627 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3628 if (ret < 0) {
3629 goto error;
3630 }
273ea72c 3631
bbd973c2
DG		 3632 /*
3633 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3634 */
3635 if (opt_sig_parent) {
8db8d1dc 3636 kill(ppid, SIGUSR1);
1d4b027a
DG		 3637 }
3638
3639 while (1) {
1d4b027a 3640 DBG("Accepting client command ...");
273ea72c 3641
b25a8868
DG		 3642 tracepoint(sessiond_th_cli_poll);
3643
5eb91c98
DG		 3644 nb_fd = LTTNG_POLL_GETNB(&events);
3645
273ea72c 3646 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3647 ret = lttng_poll_wait(&events, -1);
273ea72c 3648 if (ret < 0) {
273ea72c
DG		 3649 goto error;
3650 }
3651
5eb91c98
DG		 3652 for (i = 0; i < nb_fd; i++) {
3653 /* Fetch once the poll data */
3654 revents = LTTNG_POLL_GETEV(&events, i);
3655 pollfd = LTTNG_POLL_GETFD(&events, i);
3656
3657 /* Thread quit pipe has been closed. Killing thread. */
3658 ret = check_thread_quit_pipe(pollfd, revents);
3659 if (ret) {
3660 goto error;
3661 }
3662
3663 /* Event on the registration socket */
3664 if (pollfd == client_sock) {
3665 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3666 ERR("Client socket poll error");
3667 goto error;
3668 }
3669 }
273ea72c
DG		 3670 }
3671
5eb91c98
DG		 3672 DBG("Wait for client response");
3673
1d4b027a
DG		 3674 sock = lttcomm_accept_unix_sock(client_sock);
3675 if (sock < 0) {
3676 goto error;
3677 }
3678
be040666
DG		 3679 /* Set socket option for credentials retrieval */
3680 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3681 if (ret < 0) {
3682 goto error;
3683 }
3684
1d4b027a 3685 /* Allocate context command to process the client request */
ba7f0ae5 3686 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3687 if (cmd_ctx == NULL) {
ba7f0ae5 3688 perror("zmalloc cmd_ctx");
1d4b027a 3689 goto error;
5eb91c98 3690 }
1d4b027a
DG		 3691
3692 /* Allocate data buffer for reception */
ba7f0ae5 3693 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3694 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3695 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3696 goto error;
3697 }
1d4b027a 3698
1d4b027a
DG		 3699 cmd_ctx->llm = NULL;
3700 cmd_ctx->session = NULL;
3701
3702 /*
3703 * Data is received from the lttng client. The struct
3704 * lttcomm_session_msg (lsm) contains the command and data request of
3705 * the client.
3706 */
3707 DBG("Receiving data from client ...");
be040666
DG		 3708 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3709 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
1d4b027a 3710 if (ret <= 0) {
5eb91c98
DG		 3711 DBG("Nothing recv() from client... continuing");
3712 close(sock);
3713 free(cmd_ctx);
1d4b027a
DG		 3714 continue;
3715 }
3716
5eb91c98
DG		 3717 // TODO: Validate cmd_ctx including sanity check for
3718 // security purpose.
f7776ea7 3719
f6a9efaa 3720 rcu_thread_online();
1d4b027a
DG		 3721 /*
3722 * This function dispatch the work to the kernel or userspace tracer
3723 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3724 * informations for the client. The command context struct contains
3725 * everything this function may needs.
3726 */
3727 ret = process_client_msg(cmd_ctx);
f6a9efaa 3728 rcu_thread_offline();
1d4b027a 3729 if (ret < 0) {
bbd973c2 3730 /*
5eb91c98 3731 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3732 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3733 * (ENOMEM). Error detected but still accept command.
bbd973c2 3734 */
a2fb29a5 3735 clean_command_ctx(&cmd_ctx);
1d4b027a
DG		 3736 continue;
3737 }
3738
54d01ffb
DG		 3739 DBG("Sending response (size: %d, retcode: %s)",
3740 cmd_ctx->lttng_msg_size,
9a745bc7 3741 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3742 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
1d4b027a
DG		 3743 if (ret < 0) {
3744 ERR("Failed to send data back to client");
3745 }
3746
d6e4fca4
DG		 3747 /* End of transmission */
3748 close(sock);
be040666
DG		 3749
3750 clean_command_ctx(&cmd_ctx);
1d4b027a
DG		 3751 }
3752
3753error:
273ea72c 3754 DBG("Client thread dying");
273ea72c 3755 unlink(client_unix_sock_path);
5eb91c98
DG		 3756 close(client_sock);
3757 close(sock);
273ea72c 3758
5eb91c98 3759 lttng_poll_clean(&events);
a2fb29a5 3760 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3761
3762 rcu_unregister_thread();
1d4b027a
DG		 3763 return NULL;
3764}
3765
3766
fac6795d
DG		 3767/*
3768 * usage function on stderr
3769 */
3770static void usage(void)
3771{
b716ce68 3772 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3773 fprintf(stderr, " -h, --help Display this usage.\n");
3774 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3775 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3776 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3777 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3778 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3779 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3780 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3781 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3782 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3783 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3784 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3785 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3786 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3787 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3788 fprintf(stderr, " -V, --version Show version number.\n");
3789 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3790 fprintf(stderr, " -q, --quiet No output at all.\n");
3791 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3792 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3793 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3794}
3795
3796/*
3797 * daemon argument parsing
3798 */
3799static int parse_args(int argc, char **argv)
3800{
3801 int c;
3802
3803 static struct option long_options[] = {
3804 { "client-sock", 1, 0, 'c' },
3805 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3806 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3807 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3808 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3809 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3810 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3811 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3812 { "consumerd32-path", 1, 0, 'u' },
3813 { "consumerd32-libdir", 1, 0, 'U' },
3814 { "consumerd64-path", 1, 0, 't' },
3815 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3816 { "daemonize", 0, 0, 'd' },
5b8719f5 3817 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3818 { "help", 0, 0, 'h' },
3819 { "group", 1, 0, 'g' },
3820 { "version", 0, 0, 'V' },
75462a81 3821 { "quiet", 0, 0, 'q' },
3f9947db 3822 { "verbose", 0, 0, 'v' },
3bd1e081 3823 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3824 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3825 { NULL, 0, 0, 0 }
3826 };
3827
3828 while (1) {
3829 int option_index = 0;
4fba7219 3830 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3831 long_options, &option_index);
fac6795d
DG		 3832 if (c == -1) {
3833 break;
3834 }
3835
3836 switch (c) {
3837 case 0:
3838 fprintf(stderr, "option %s", long_options[option_index].name);
3839 if (optarg) {
3840 fprintf(stderr, " with arg %s\n", optarg);
3841 }
3842 break;
b716ce68 3843 case 'c':
fac6795d
DG		 3844 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3845 break;
3846 case 'a':
3847 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3848 break;
3849 case 'd':
3850 opt_daemon = 1;
3851 break;
3852 case 'g':
fb09408a 3853 opt_tracing_group = optarg;
fac6795d
DG		 3854 break;
3855 case 'h':
3856 usage();
3857 exit(EXIT_FAILURE);
3858 case 'V':
3859 fprintf(stdout, "%s\n", VERSION);
3860 exit(EXIT_SUCCESS);
5b8719f5
DG		 3861 case 'S':
3862 opt_sig_parent = 1;
3863 break;
d6f42150 3864 case 'E':
3bd1e081 3865 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3866 break;
3867 case 'C':
3bd1e081
MD		 3868 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3869 break;
3870 case 'F':
7753dea8 3871 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3872 break;
3873 case 'D':
7753dea8
MD		 3874 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3875 break;
3876 case 'H':
3877 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3878 break;
3879 case 'G':
3880 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3881 break;
4fba7219
DG		 3882 case 'N':
3883 opt_no_kernel = 1;
3884 break;
75462a81
DG		 3885 case 'q':
3886 opt_quiet = 1;
3887 break;
3f9947db 3888 case 'v':
53086306
DG		 3889 /* Verbose level can increase using multiple -v */
3890 opt_verbose += 1;
3f9947db 3891 break;
31f73cc9 3892 case 'Z':
3bd1e081 3893 opt_verbose_consumer += 1;
31f73cc9 3894 break;
fb09408a 3895 case 'u':
fc7a59ce 3896 consumerd32_bin= optarg;
ebaeda94
MD		 3897 break;
3898 case 'U':
3899 consumerd32_libdir = optarg;
7753dea8
MD		 3900 break;
3901 case 't':
fc7a59ce 3902 consumerd64_bin = optarg;
ebaeda94
MD		 3903 break;
3904 case 'T':
3905 consumerd64_libdir = optarg;
fb09408a 3906 break;
fac6795d
DG		 3907 default:
3908 /* Unknown option or other error.
3909 * Error is printed by getopt, just return */
3910 return -1;
3911 }
3912 }
3913
3914 return 0;
3915}
3916
3917/*
d063d709 3918 * Creates the two needed socket by the daemon.
d6f42150
DG		 3919 * apps_sock - The communication socket for all UST apps.
3920 * client_sock - The communication of the cli tool (lttng).
fac6795d 3921 */
cf3af59e 3922static int init_daemon_socket(void)
fac6795d
DG		 3923{
3924 int ret = 0;
3925 mode_t old_umask;
3926
3927 old_umask = umask(0);
3928
3929 /* Create client tool unix socket */
d6f42150
DG		 3930 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3931 if (client_sock < 0) {
3932 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3933 ret = -1;
3934 goto end;
3935 }
3936
3937 /* File permission MUST be 660 */
3938 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3939 if (ret < 0) {
d6f42150 3940 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3941 perror("chmod");
3942 goto end;
3943 }
3944
3945 /* Create the application unix socket */
d6f42150
DG		 3946 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3947 if (apps_sock < 0) {
3948 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3949 ret = -1;
3950 goto end;
3951 }
3952
d6f42150 3953 /* File permission MUST be 666 */
54d01ffb
DG		 3954 ret = chmod(apps_unix_sock_path,
3955 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3956 if (ret < 0) {
d6f42150 3957 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3958 perror("chmod");
3959 goto end;
3960 }
3961
3962end:
3963 umask(old_umask);
3964 return ret;
3965}
3966
3967/*
54d01ffb
DG		 3968 * Check if the global socket is available, and if a daemon is answering at the
3969 * other side. If yes, error is returned.
fac6795d 3970 */
cf3af59e 3971static int check_existing_daemon(void)
fac6795d 3972{
7d8234d9 3973 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3974 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3975 return 0;
099e26bd 3976 }
54d01ffb 3977
7d8234d9 3978 /* Is there anybody out there ? */
099e26bd 3979 if (lttng_session_daemon_alive()) {
7d8234d9 3980 return -EEXIST;
099e26bd 3981 } else {
7d8234d9 3982 return 0;
099e26bd 3983 }
fac6795d
DG		 3984}
3985
fac6795d 3986/*
d063d709 3987 * Set the tracing group gid onto the client socket.
5e16da05 3988 *
d063d709
DG		 3989 * Race window between mkdir and chown is OK because we are going from more
3990 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3991 */
be040666 3992static int set_permissions(char *rundir)
fac6795d
DG		 3993{
3994 int ret;
996b65c8 3995 gid_t gid;
fac6795d 3996
996b65c8
MD		 3997 gid = allowed_group();
3998 if (gid < 0) {
be040666
DG		 3999 WARN("No tracing group detected");
4000 ret = 0;
fac6795d
DG		 4001 goto end;
4002 }
4003
d6f42150 4004 /* Set lttng run dir */
be040666 4005 ret = chown(rundir, 0, gid);
d6f42150 4006 if (ret < 0) {
be040666 4007 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 4008 perror("chown");
4009 }
4010
4011 /* lttng client socket path */
996b65c8 4012 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 4013 if (ret < 0) {
d6f42150
DG		 4014 ERR("Unable to set group on %s", client_unix_sock_path);
4015 perror("chown");
4016 }
4017
3bd1e081
MD		 4018 /* kconsumer error socket path */
4019 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 4020 if (ret < 0) {
3bd1e081
MD		 4021 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4022 perror("chown");
4023 }
4024
7753dea8
MD		 4025 /* 64-bit ustconsumer error socket path */
4026 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4027 if (ret < 0) {
4028 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4029 perror("chown");
4030 }
4031
4032 /* 32-bit ustconsumer compat32 error socket path */
4033 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 4034 if (ret < 0) {
7753dea8 4035 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 4036 perror("chown");
4037 }
4038
d6f42150 4039 DBG("All permissions are set");
e07ae692 4040
fac6795d
DG		 4041end:
4042 return ret;
4043}
4044
7a485870 4045/*
d063d709 4046 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 4047 */
4048static int create_kernel_poll_pipe(void)
4049{
4050 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4051}
4052
099e26bd
DG		 4053/*
4054 * Create the application command pipe to wake thread_manage_apps.
4055 */
4056static int create_apps_cmd_pipe(void)
4057{
4058 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4059}
4060
d6f42150 4061/*
d063d709 4062 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4063 */
67e40797 4064static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 4065{
4066 int ret;
4067
67e40797
DG		 4068 DBG3("Creating LTTng run directory: %s", rundir);
4069
4070 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
d6f42150 4071 if (ret < 0) {
b1f11e69 4072 if (errno != EEXIST) {
67e40797 4073 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4074 goto error;
4075 } else {
4076 ret = 0;
4077 }
d6f42150
DG		 4078 }
4079
4080error:
4081 return ret;
4082}
4083
4084/*
d063d709
DG		 4085 * Setup sockets and directory needed by the kconsumerd communication with the
4086 * session daemon.
d6f42150 4087 */
67e40797
DG		 4088static int set_consumer_sockets(struct consumer_data *consumer_data,
4089 const char *rundir)
d6f42150
DG		 4090{
4091 int ret;
67e40797 4092 char path[PATH_MAX];
d6f42150 4093
67e40797 4094 switch (consumer_data->type) {
7753dea8 4095 case LTTNG_CONSUMER_KERNEL:
60922cb0 4096 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD		 4097 break;
4098 case LTTNG_CONSUMER64_UST:
60922cb0 4099 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4100 break;
4101 case LTTNG_CONSUMER32_UST:
60922cb0 4102 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4103 break;
4104 default:
4105 ERR("Consumer type unknown");
4106 ret = -EINVAL;
4107 goto error;
d6f42150
DG		 4108 }
4109
67e40797
DG		 4110 DBG2("Creating consumer directory: %s", path);
4111
3bd1e081 4112 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4113 if (ret < 0) {
6beb2242 4114 if (errno != EEXIST) {
3bd1e081 4115 ERR("Failed to create %s", path);
6beb2242
DG		 4116 goto error;
4117 }
4118 ret = 0;
d6f42150
DG		 4119 }
4120
4121 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4122 consumer_data->err_sock =
4123 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4124 if (consumer_data->err_sock < 0) {
4125 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4126 ret = -1;
4127 goto error;
4128 }
4129
4130 /* File permission MUST be 660 */
3bd1e081 4131 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4132 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4133 if (ret < 0) {
3bd1e081 4134 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4135 PERROR("chmod");
d6f42150
DG		 4136 goto error;
4137 }
4138
4139error:
4140 return ret;
4141}
4142
fac6795d 4143/*
d063d709 4144 * Signal handler for the daemon
cf3af59e 4145 *
54d01ffb
DG		 4146 * Simply stop all worker threads, leaving main() return gracefully after
4147 * joining all threads and calling cleanup().
fac6795d
DG		 4148 */
4149static void sighandler(int sig)
4150{
4151 switch (sig) {
cf3af59e 4152 case SIGPIPE:
af87c45a 4153 DBG("SIGPIPE caught");
cf3af59e
MD		 4154 return;
4155 case SIGINT:
af87c45a 4156 DBG("SIGINT caught");
cf3af59e
MD		 4157 stop_threads();
4158 break;
4159 case SIGTERM:
af87c45a 4160 DBG("SIGTERM caught");
cf3af59e
MD		 4161 stop_threads();
4162 break;
4163 default:
4164 break;
fac6795d 4165 }
fac6795d
DG		 4166}
4167
4168/*
d063d709 4169 * Setup signal handler for :
1d4b027a 4170 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4171 */
1d4b027a 4172static int set_signal_handler(void)
fac6795d 4173{
1d4b027a
DG		 4174 int ret = 0;
4175 struct sigaction sa;
4176 sigset_t sigset;
fac6795d 4177
1d4b027a
DG		 4178 if ((ret = sigemptyset(&sigset)) < 0) {
4179 perror("sigemptyset");
4180 return ret;
4181 }
d6f42150 4182
1d4b027a
DG		 4183 sa.sa_handler = sighandler;
4184 sa.sa_mask = sigset;
4185 sa.sa_flags = 0;
4186 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4187 perror("sigaction");
4188 return ret;
d6f42150
DG		 4189 }
4190
1d4b027a
DG		 4191 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4192 perror("sigaction");
4193 return ret;
d6f42150 4194 }
aaf26714 4195
1d4b027a
DG		 4196 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4197 perror("sigaction");
4198 return ret;
8c0faa1d
DG		 4199 }
4200
1d4b027a
DG		 4201 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4202
4203 return ret;
fac6795d
DG		 4204}
4205
f3ed775e 4206/*
d063d709
DG		 4207 * Set open files limit to unlimited. This daemon can open a large number of
4208 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4209 */
4210static void set_ulimit(void)
4211{
4212 int ret;
4213 struct rlimit lim;
4214
a88df331 4215 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4216 lim.rlim_cur = 65535;
4217 lim.rlim_max = 65535;
4218
4219 ret = setrlimit(RLIMIT_NOFILE, &lim);
4220 if (ret < 0) {
4221 perror("failed to set open files limit");
4222 }
4223}
4224
fac6795d
DG		 4225/*
4226 * main
4227 */
4228int main(int argc, char **argv)
4229{
fac6795d
DG		 4230 int ret = 0;
4231 void *status;
b082db07 4232 const char *home_path;
fac6795d 4233
b25a8868 4234 tracepoint(sessiond_boot_start);
7bb1478a 4235
335a95b7
MD		 4236 init_kernel_workarounds();
4237
f6a9efaa 4238 rcu_register_thread();
b25a8868 4239
273ea72c 4240 /* Create thread quit pipe */
cf3af59e
MD		 4241 if ((ret = init_thread_quit_pipe()) < 0) {
4242 goto error;
273ea72c
DG		 4243 }
4244
7753dea8 4245 setup_consumerd_path();
fb09408a 4246
fac6795d
DG		 4247 /* Parse arguments */
4248 progname = argv[0];
4249 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4250 goto error;
fac6795d
DG		 4251 }
4252
4253 /* Daemonize */
4254 if (opt_daemon) {
53094c05
DG		 4255 ret = daemon(0, 0);
4256 if (ret < 0) {
4257 perror("daemon");
cf3af59e 4258 goto error;
53094c05 4259 }
fac6795d
DG		 4260 }
4261
4262 /* Check if daemon is UID = 0 */
4263 is_root = !getuid();
4264
fac6795d 4265 if (is_root) {
990570ed 4266 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG		 4267
4268 /* Create global run dir with root access */
4269 ret = create_lttng_rundir(rundir);
d6f42150 4270 if (ret < 0) {
cf3af59e 4271 goto error;
d6f42150
DG		 4272 }
4273
fac6795d 4274 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4275 snprintf(apps_unix_sock_path, PATH_MAX,
4276 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4277 }
4278
4279 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4280 snprintf(client_unix_sock_path, PATH_MAX,
4281 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4282 }
0fdd1e2c
DG		 4283
4284 /* Set global SHM for ust */
4285 if (strlen(wait_shm_path) == 0) {
4286 snprintf(wait_shm_path, PATH_MAX,
4287 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4288 }
67e40797
DG		 4289
4290 /* Setup kernel consumerd path */
4291 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 4292 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 4293 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4294 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG		 4295
4296 DBG2("Kernel consumer err path: %s",
4297 kconsumer_data.err_unix_sock_path);
4298 DBG2("Kernel consumer cmd path: %s",
4299 kconsumer_data.cmd_unix_sock_path);
fac6795d 4300 } else {
b082db07
DG		 4301 home_path = get_home_dir();
4302 if (home_path == NULL) {
273ea72c
DG		 4303 /* TODO: Add --socket PATH option */
4304 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4305 ret = -EPERM;
4306 goto error;
b082db07
DG		 4307 }
4308
67e40797
DG		 4309 /*
4310 * Create rundir from home path. This will create something like
4311 * $HOME/.lttng
4312 */
990570ed 4313 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG		 4314 if (ret < 0) {
4315 ret = -ENOMEM;
4316 goto error;
4317 }
4318
4319 ret = create_lttng_rundir(rundir);
4320 if (ret < 0) {
4321 goto error;
4322 }
4323
fac6795d 4324 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4325 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4326 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4327 }
4328
4329 /* Set the cli tool unix socket path */
4330 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4331 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4332 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4333 }
0fdd1e2c
DG		 4334
4335 /* Set global SHM for ust */
4336 if (strlen(wait_shm_path) == 0) {
4337 snprintf(wait_shm_path, PATH_MAX,
4338 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4339 }
fac6795d
DG		 4340 }
4341
847177cd
DG		 4342 DBG("Client socket path %s", client_unix_sock_path);
4343 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4344 DBG("LTTng run directory path: %s", rundir);
4345
4346 /* 32 bits consumerd path setup */
4347 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 4348 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 4349 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4350 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG		 4351
4352 DBG2("UST consumer 32 bits err path: %s",
4353 ustconsumer32_data.err_unix_sock_path);
4354 DBG2("UST consumer 32 bits cmd path: %s",
4355 ustconsumer32_data.cmd_unix_sock_path);
4356
4357 /* 64 bits consumerd path setup */
4358 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 4359 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 4360 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4361 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG		 4362
4363 DBG2("UST consumer 64 bits err path: %s",
4364 ustconsumer64_data.err_unix_sock_path);
4365 DBG2("UST consumer 64 bits cmd path: %s",
4366 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4367
273ea72c 4368 /*
7d8234d9 4369 * See if daemon already exist.
fac6795d 4370 */
7d8234d9 4371 if ((ret = check_existing_daemon()) < 0) {
75462a81 4372 ERR("Already running daemon.\n");
273ea72c 4373 /*
cf3af59e
MD		 4374 * We do not goto exit because we must not cleanup()
4375 * because a daemon is already running.
ab118b20 4376 */
cf3af59e 4377 goto error;
a88df331
DG		 4378 }
4379
54d01ffb 4380 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4381
4382 /*
4383 * These actions must be executed as root. We do that *after* setting up
4384 * the sockets path because we MUST make the check for another daemon using
4385 * those paths *before* trying to set the kernel consumer sockets and init
4386 * kernel tracer.
4387 */
4388 if (is_root) {
67e40797 4389 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4390 if (ret < 0) {
4391 goto exit;
4392 }
4393
a88df331 4394 /* Setup kernel tracer */
4fba7219
DG		 4395 if (!opt_no_kernel) {
4396 init_kernel_tracer();
4397 }
a88df331
DG		 4398
4399 /* Set ulimit for open files */
4400 set_ulimit();
fac6795d
DG		 4401 }
4402
67e40797
DG		 4403 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4404 if (ret < 0) {
4405 goto exit;
4406 }
4407
4408 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4409 if (ret < 0) {
4410 goto exit;
4411 }
4412
cf3af59e
MD		 4413 if ((ret = set_signal_handler()) < 0) {
4414 goto exit;
fac6795d
DG		 4415 }
4416
d6f42150 4417 /* Setup the needed unix socket */
cf3af59e
MD		 4418 if ((ret = init_daemon_socket()) < 0) {
4419 goto exit;
fac6795d
DG		 4420 }
4421
4422 /* Set credentials to socket */
be040666 4423 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4424 goto exit;
fac6795d
DG		 4425 }
4426
5b8719f5
DG		 4427 /* Get parent pid if -S, --sig-parent is specified. */
4428 if (opt_sig_parent) {
4429 ppid = getppid();
4430 }
4431
7a485870 4432 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4433 if ((ret = create_kernel_poll_pipe()) < 0) {
4434 goto exit;
7a485870
DG		 4435 }
4436
099e26bd
DG		 4437 /* Setup the thread apps communication pipe. */
4438 if ((ret = create_apps_cmd_pipe()) < 0) {
4439 goto exit;
4440 }
4441
4442 /* Init UST command queue. */
4443 cds_wfq_init(&ust_cmd_queue.queue);
4444
f6a9efaa
DG		 4445 /* Init UST app hash table */
4446 ust_app_ht_alloc();
4447
273ea72c 4448 /*
54d01ffb
DG		 4449 * Get session list pointer. This pointer MUST NOT be free(). This list is
4450 * statically declared in session.c
273ea72c 4451 */
54d01ffb 4452 session_list_ptr = session_get_list();
b5541356 4453
5eb91c98
DG		 4454 /* Set up max poll set size */
4455 lttng_poll_set_max_size();
4456
cf3af59e 4457 /* Create thread to manage the client socket */
099e26bd
DG		 4458 ret = pthread_create(&client_thread, NULL,
4459 thread_manage_clients, (void *) NULL);
cf3af59e 4460 if (ret != 0) {
099e26bd 4461 perror("pthread_create clients");
cf3af59e
MD		 4462 goto exit_client;
4463 }
fac6795d 4464
099e26bd
DG		 4465 /* Create thread to dispatch registration */
4466 ret = pthread_create(&dispatch_thread, NULL,
4467 thread_dispatch_ust_registration, (void *) NULL);
4468 if (ret != 0) {
4469 perror("pthread_create dispatch");
4470 goto exit_dispatch;
4471 }
4472
4473 /* Create thread to manage application registration. */
4474 ret = pthread_create(&reg_apps_thread, NULL,
4475 thread_registration_apps, (void *) NULL);
4476 if (ret != 0) {
4477 perror("pthread_create registration");
4478 goto exit_reg_apps;
4479 }
4480
cf3af59e 4481 /* Create thread to manage application socket */
54d01ffb
DG		 4482 ret = pthread_create(&apps_thread, NULL,
4483 thread_manage_apps, (void *) NULL);
cf3af59e 4484 if (ret != 0) {
099e26bd 4485 perror("pthread_create apps");
cf3af59e
MD		 4486 goto exit_apps;
4487 }
fac6795d 4488
cf3af59e 4489 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4490 ret = pthread_create(&kernel_thread, NULL,
4491 thread_manage_kernel, (void *) NULL);
cf3af59e 4492 if (ret != 0) {
099e26bd 4493 perror("pthread_create kernel");
cf3af59e
MD		 4494 goto exit_kernel;
4495 }
7a485870 4496
b25a8868
DG		 4497 tracepoint(sessiond_boot_end);
4498
cf3af59e
MD		 4499 ret = pthread_join(kernel_thread, &status);
4500 if (ret != 0) {
4501 perror("pthread_join");
4502 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4503 }
4504
cf3af59e
MD		 4505exit_kernel:
4506 ret = pthread_join(apps_thread, &status);
4507 if (ret != 0) {
4508 perror("pthread_join");
4509 goto error; /* join error, exit without cleanup */
4510 }
fac6795d 4511
cf3af59e 4512exit_apps:
099e26bd
DG		 4513 ret = pthread_join(reg_apps_thread, &status);
4514 if (ret != 0) {
4515 perror("pthread_join");
4516 goto error; /* join error, exit without cleanup */
4517 }
4518
4519exit_reg_apps:
4520 ret = pthread_join(dispatch_thread, &status);
4521 if (ret != 0) {
4522 perror("pthread_join");
4523 goto error; /* join error, exit without cleanup */
4524 }
4525
4526exit_dispatch:
cf3af59e
MD		 4527 ret = pthread_join(client_thread, &status);
4528 if (ret != 0) {
4529 perror("pthread_join");
4530 goto error; /* join error, exit without cleanup */
4531 }
4532
3bd1e081 4533 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4534 if (ret != 0) {
3bd1e081 4535 perror("join_consumer");
cf3af59e
MD		 4536 goto error; /* join error, exit without cleanup */
4537 }
a88df331 4538
cf3af59e 4539exit_client:
a88df331 4540exit:
cf3af59e
MD		 4541 /*
4542 * cleanup() is called when no other thread is running.
4543 */
f6a9efaa 4544 rcu_thread_online();
cf3af59e 4545 cleanup();
f6a9efaa
DG		 4546 rcu_thread_offline();
4547 rcu_unregister_thread();
67e40797 4548 if (!ret) {
cf3af59e 4549 exit(EXIT_SUCCESS);
67e40797 4550 }
cf3af59e 4551error:
5e16da05 4552 exit(EXIT_FAILURE);
fac6795d 4553}
LTTng 2.0 tools and control repository
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