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Verify UST comm proto version
[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"
099e26bd 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};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 80const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD		 81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG		 89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d 92static int opt_daemon;
4fba7219 93static int opt_no_kernel;
fac6795d 94static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 95static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 96static char *rundir;
3bd1e081
MD		 97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
60922cb0
DG		 101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
7753dea8
MD		 104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
60922cb0
DG		 106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
7753dea8
MD		 108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
60922cb0
DG		 111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
DG		 117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
d6f42150
DG		 125static int client_sock;
126static int apps_sock;
20fe2104 127static int kernel_tracer_fd;
7a485870 128static int kernel_poll_pipe[2];
1d4b027a 129
273ea72c
DG		 130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134static int thread_quit_pipe[2];
135
099e26bd
DG		 136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140static int apps_cmd_pipe[2];
141
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG		 150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
b5541356
DG		 159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD		 171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
fb6f1fa2
YB		 174static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD		 178
179static
7753dea8 180void setup_consumerd_path(void)
fb09408a 181{
fc7a59ce 182 const char *bin, *libdir;
fb09408a 183
7753dea8
MD		 184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
7753dea8 188 */
ebaeda94 189#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 199 }
ebaeda94
MD		 200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 202 }
203#else
204#error "Unknown bitness"
205#endif
206
fb09408a
MD		 207 /*
208 * runtime env. var. overrides the build default.
209 */
fc7a59ce
AM		 210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
7753dea8 213 }
fc7a59ce
AM		 214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
ebaeda94 217 }
72f579ee 218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
ebaeda94
MD		 219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
72f579ee 222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD		 223 if (libdir) {
224 consumerd64_libdir = libdir;
fb09408a
MD		 225 }
226}
227
5eb91c98
DG		 228/*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233{
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254error:
255 return ret;
256}
257
258/*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263static int check_thread_quit_pipe(int fd, uint32_t events)
264{
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270}
271
0fdd1e2c
DG		 272/*
273 * Return group ID of the tracing group or -1 if not found.
274 */
996b65c8
MD		 275static gid_t allowed_group(void)
276{
277 struct group *grp;
278
274e143b
MD		 279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
996b65c8
MD		 284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289}
290
273ea72c 291/*
5eb91c98 292 * Init thread quit pipe.
273ea72c
DG		 293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296static int init_thread_quit_pipe(void)
297{
298 int ret;
299
300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
301 if (ret < 0) {
302 perror("thread quit pipe");
303 goto error;
304 }
305
306error:
307 return ret;
308}
309
fac6795d 310/*
d063d709
DG		 311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
fac6795d 313 */
1d4b027a 314static void teardown_kernel_session(struct ltt_session *session)
fac6795d 315{
8f7a84dd 316 if (!session->kernel_session) {
99bab54f 317 DBG3("No kernel session when tearing down session");
84ea9c99 318 return;
8f7a84dd
DG		 319 }
320
84ea9c99 321 DBG("Tearing down kernel session");
d9800920 322
84ea9c99
MD		 323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 329 }
84ea9c99
MD		 330
331 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 332}
333
f6a9efaa
DG		 334/*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338static void teardown_ust_session(struct ltt_session *session)
339{
84cd17c6
MD		 340 int ret;
341
8f7a84dd 342 if (!session->ust_session) {
99bab54f 343 DBG3("No UST session when tearing down session");
f470a390 344 return;
8f7a84dd
DG		 345 }
346
84ea9c99 347 DBG("Tearing down UST session(s)");
8f7a84dd 348
84cd17c6
MD		 349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
8f7a84dd 353
f6a9efaa
DG		 354 trace_ust_destroy_session(session->ust_session);
355}
356
099e26bd
DG		 357/*
358 * Stop all threads by closing the thread quit pipe.
359 */
cf3af59e
MD		 360static void stop_threads(void)
361{
5eb91c98
DG		 362 int ret;
363
cf3af59e
MD		 364 /* Stopping all threads */
365 DBG("Terminating all threads");
54d01ffb 366 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
099e26bd
DG		 371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 374}
375
fac6795d 376/*
d063d709 377 * Cleanup the daemon
fac6795d 378 */
cf3af59e 379static void cleanup(void)
fac6795d 380{
1d4b027a
DG		 381 int ret;
382 char *cmd;
af9737e9 383 struct ltt_session *sess, *stmp;
fac6795d 384
1d4b027a 385 DBG("Cleaning up");
e07ae692 386
67e40797
DG		 387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
5461b305 392
67e40797
DG		 393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
1d4b027a 397 }
67e40797 398 free(cmd);
5461b305 399
99bab54f 400 DBG("Cleaning up all sessions");
fac6795d 401
b5541356 402 /* Destroy session list mutex */
273ea72c
DG		 403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
54d01ffb
DG		 407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
273ea72c 409 teardown_kernel_session(sess);
f6a9efaa
DG		 410 teardown_ust_session(sess);
411 free(sess);
273ea72c
DG		 412 }
413 }
414
099e26bd 415 DBG("Closing all UST sockets");
56fff090 416 ust_app_clean_list();
099e26bd 417
3bd1e081 418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 419
4fba7219
DG		 420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
422 close(kernel_tracer_fd);
2f50c8a3 423 DBG("Unloading kernel modules");
096102bd 424 modprobe_remove_lttng_all();
2f50c8a3 425 }
5eb91c98
DG		 426
427 close(thread_quit_pipe[0]);
428 close(thread_quit_pipe[1]);
421cb601
DG		 429
430 /* <fun> */
f56a39af 431 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG		 432 "Matthew, BEET driven development works!%c[%dm",
433 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
434 /* </fun> */
fac6795d
DG		 435}
436
e065084a 437/*
d063d709 438 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 439 *
d063d709 440 * Return lttcomm error code.
e065084a
DG		 441 */
442static int send_unix_sock(int sock, void *buf, size_t len)
443{
444 /* Check valid length */
445 if (len <= 0) {
446 return -1;
447 }
448
449 return lttcomm_send_unix_sock(sock, buf, len);
450}
451
5461b305 452/*
d063d709 453 * Free memory of a command context structure.
5461b305 454 */
a2fb29a5 455static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 456{
a2fb29a5
DG		 457 DBG("Clean command context structure");
458 if (*cmd_ctx) {
459 if ((*cmd_ctx)->llm) {
460 free((*cmd_ctx)->llm);
5461b305 461 }
a2fb29a5
DG		 462 if ((*cmd_ctx)->lsm) {
463 free((*cmd_ctx)->lsm);
5461b305 464 }
a2fb29a5
DG		 465 free(*cmd_ctx);
466 *cmd_ctx = NULL;
5461b305
DG		 467 }
468}
469
f3ed775e 470/*
d063d709 471 * Send all stream fds of kernel channel to the consumer.
f3ed775e 472 */
2bdd86d4 473static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD		 474 int sock, struct ltt_kernel_channel *channel,
475 uid_t uid, gid_t gid)
f3ed775e
DG		 476{
477 int ret;
f3ed775e 478 struct ltt_kernel_stream *stream;
3bd1e081 479 struct lttcomm_consumer_msg lkm;
f3ed775e 480
3bd1e081 481 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 482 channel->channel->name);
f3ed775e 483
3bd1e081
MD		 484 /* Send channel */
485 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
486 lkm.u.channel.channel_key = channel->fd;
487 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
488 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 489 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 490 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 491 if (ret < 0) {
3bd1e081 492 perror("send consumer channel");
f3ed775e
DG		 493 goto error;
494 }
495
3bd1e081 496 /* Send streams */
7a485870 497 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 498 if (!stream->fd) {
499 continue;
500 }
501 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
502 lkm.u.stream.channel_key = channel->fd;
503 lkm.u.stream.stream_key = stream->fd;
504 lkm.u.stream.state = stream->state;
505 lkm.u.stream.output = channel->channel->attr.output;
506 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 507 lkm.u.stream.uid = uid;
508 lkm.u.stream.gid = gid;
3bd1e081
MD		 509 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
510 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
511 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
512 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
513 if (ret < 0) {
514 perror("send consumer stream");
515 goto error;
516 }
517 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
518 if (ret < 0) {
519 perror("send consumer stream ancillary data");
520 goto error;
f3ed775e
DG		 521 }
522 }
523
3bd1e081 524 DBG("consumer channel streams sent");
f3ed775e
DG		 525
526 return 0;
527
528error:
529 return ret;
530}
531
532/*
d063d709 533 * Send all stream fds of the kernel session to the consumer.
f3ed775e 534 */
2bdd86d4 535static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 536 struct ltt_kernel_session *session)
f3ed775e
DG		 537{
538 int ret;
539 struct ltt_kernel_channel *chan;
3bd1e081
MD		 540 struct lttcomm_consumer_msg lkm;
541 int sock = session->consumer_fd;
7a485870
DG		 542
543 DBG("Sending metadata stream fd");
544
2bdd86d4 545 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 546 if (session->consumer_fd == 0) {
3bd1e081 547 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 548 }
549
7a485870 550 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 551 /* Send metadata channel fd */
552 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
553 lkm.u.channel.channel_key = session->metadata->fd;
554 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
555 lkm.u.channel.mmap_len = 0; /* for kernel */
556 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
557 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
558 if (ret < 0) {
559 perror("send consumer channel");
560 goto error;
561 }
562
563 /* Send metadata stream fd */
564 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
565 lkm.u.stream.channel_key = session->metadata->fd;
566 lkm.u.stream.stream_key = session->metadata_stream_fd;
567 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
568 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
569 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 570 lkm.u.stream.uid = session->uid;
571 lkm.u.stream.gid = session->gid;
3bd1e081
MD		 572 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
573 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
574 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
575 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
576 if (ret < 0) {
577 perror("send consumer stream");
578 goto error;
579 }
580 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 581 if (ret < 0) {
3bd1e081 582 perror("send consumer stream");
7a485870
DG		 583 goto error;
584 }
585 }
f3ed775e 586
f3ed775e 587 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD		 588 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
589 session->uid, session->gid);
2bdd86d4
MD		 590 if (ret < 0) {
591 goto error;
592 }
593 }
594
595 DBG("consumer fds (metadata and channel streams) sent");
596
597 return 0;
598
599error:
600 return ret;
601}
602
fac6795d 603/*
0fdd1e2c 604 * Notify UST applications using the shm mmap futex.
fac6795d 605 */
0fdd1e2c 606static int notify_ust_apps(int active)
fac6795d 607{
0fdd1e2c 608 char *wait_shm_mmap;
fac6795d 609
0fdd1e2c 610 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 611
0fdd1e2c
DG		 612 /* See shm.c for this call implying mmap, shm and futex calls */
613 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
614 if (wait_shm_mmap == NULL) {
fac6795d
DG		 615 goto error;
616 }
617
0fdd1e2c
DG		 618 /* Wake waiting process */
619 futex_wait_update((int32_t *) wait_shm_mmap, active);
620
621 /* Apps notified successfully */
622 return 0;
fac6795d
DG		 623
624error:
0fdd1e2c 625 return -1;
fac6795d
DG		 626}
627
e065084a 628/*
d063d709
DG		 629 * Setup the outgoing data buffer for the response (llm) by allocating the
630 * right amount of memory and copying the original information from the lsm
631 * structure.
ca95a216 632 *
d063d709 633 * Return total size of the buffer pointed by buf.
ca95a216 634 */
5461b305 635static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 636{
f3ed775e 637 int ret, buf_size;
ca95a216 638
f3ed775e 639 buf_size = size;
5461b305 640
ba7f0ae5 641 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 642 if (cmd_ctx->llm == NULL) {
ba7f0ae5 643 perror("zmalloc");
5461b305 644 ret = -ENOMEM;
ca95a216
DG		 645 goto error;
646 }
647
5461b305
DG		 648 /* Copy common data */
649 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 650 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 651
5461b305
DG		 652 cmd_ctx->llm->data_size = size;
653 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
654
ca95a216
DG		 655 return buf_size;
656
657error:
658 return ret;
659}
660
7a485870 661/*
5eb91c98 662 * Update the kernel poll set of all channel fd available over all tracing
d063d709 663 * session. Add the wakeup pipe at the end of the set.
7a485870 664 */
5eb91c98 665static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 666{
5eb91c98 667 int ret;
7a485870
DG		 668 struct ltt_session *session;
669 struct ltt_kernel_channel *channel;
670
5eb91c98 671 DBG("Updating kernel poll set");
7a485870 672
54d01ffb 673 session_lock_list();
b5541356 674 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 675 session_lock(session);
7a485870 676 if (session->kernel_session == NULL) {
54d01ffb 677 session_unlock(session);
7a485870
DG		 678 continue;
679 }
7a485870 680
54d01ffb
DG		 681 cds_list_for_each_entry(channel,
682 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 683 /* Add channel fd to the kernel poll set */
684 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
685 if (ret < 0) {
54d01ffb 686 session_unlock(session);
5eb91c98
DG		 687 goto error;
688 }
689 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 690 }
54d01ffb 691 session_unlock(session);
7a485870 692 }
54d01ffb 693 session_unlock_list();
7a485870 694
5eb91c98 695 return 0;
7a485870
DG		 696
697error:
54d01ffb 698 session_unlock_list();
7a485870
DG		 699 return -1;
700}
701
702/*
54d01ffb 703 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 704 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 705 *
d063d709 706 * Useful for CPU hotplug feature.
7a485870 707 */
2bdd86d4 708static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 709{
710 int ret = 0;
711 struct ltt_session *session;
712 struct ltt_kernel_channel *channel;
713
714 DBG("Updating kernel streams for channel fd %d", fd);
715
54d01ffb 716 session_lock_list();
b5541356 717 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 718 session_lock(session);
7a485870 719 if (session->kernel_session == NULL) {
54d01ffb 720 session_unlock(session);
7a485870
DG		 721 continue;
722 }
d9800920
DG		 723
724 /* This is not suppose to be 0 but this is an extra security check */
725 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 726 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 727 }
728
5eb91c98
DG		 729 cds_list_for_each_entry(channel,
730 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 731 if (channel->fd == fd) {
732 DBG("Channel found, updating kernel streams");
733 ret = kernel_open_channel_stream(channel);
734 if (ret < 0) {
b3c750d2 735 goto error;
7a485870 736 }
d9800920 737
7a485870 738 /*
5eb91c98
DG		 739 * Have we already sent fds to the consumer? If yes, it means
740 * that tracing is started so it is safe to send our updated
741 * stream fds.
7a485870 742 */
3bd1e081 743 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 744 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD		 745 session->kernel_session->consumer_fd, channel,
746 session->uid, session->gid);
7a485870 747 if (ret < 0) {
b3c750d2 748 goto error;
7a485870
DG		 749 }
750 }
b3c750d2 751 goto error;
7a485870
DG		 752 }
753 }
54d01ffb 754 session_unlock(session);
7a485870 755 }
54d01ffb 756 session_unlock_list();
b3c750d2 757 return ret;
7a485870 758
b3c750d2 759error:
54d01ffb
DG		 760 session_unlock(session);
761 session_unlock_list();
7a485870
DG		 762 return ret;
763}
764
487cf67c
DG		 765/*
766 * For each tracing session, update newly registered apps.
767 */
768static void update_ust_app(int app_sock)
769{
770 struct ltt_session *sess, *stmp;
771
772 /* For all tracing session(s) */
773 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG		 774 if (sess->ust_session) {
775 ust_app_global_update(sess->ust_session, app_sock);
776 }
487cf67c
DG		 777 }
778}
779
7a485870 780/*
d063d709 781 * This thread manage event coming from the kernel.
7a485870 782 *
d063d709
DG		 783 * Features supported in this thread:
784 * -) CPU Hotplug
7a485870
DG		 785 */
786static void *thread_manage_kernel(void *data)
787{
5eb91c98
DG		 788 int ret, i, pollfd, update_poll_flag = 1;
789 uint32_t revents, nb_fd;
7a485870 790 char tmp;
5eb91c98 791 struct lttng_poll_event events;
7a485870
DG		 792
793 DBG("Thread manage kernel started");
794
5eb91c98
DG		 795 ret = create_thread_poll_set(&events, 2);
796 if (ret < 0) {
797 goto error;
798 }
799
800 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
801 if (ret < 0) {
802 goto error;
803 }
804
7a485870
DG		 805 while (1) {
806 if (update_poll_flag == 1) {
5f822d0a
DG		 807 /*
808 * Reset number of fd in the poll set. Always 2 since there is the thread
809 * quit pipe and the kernel pipe.
810 */
811 events.nb_fd = 2;
812
5eb91c98
DG		 813 ret = update_kernel_poll(&events);
814 if (ret < 0) {
7a485870
DG		 815 goto error;
816 }
817 update_poll_flag = 0;
818 }
819
5eb91c98
DG		 820 nb_fd = LTTNG_POLL_GETNB(&events);
821
822 DBG("Thread kernel polling on %d fds", nb_fd);
823
824 /* Zeroed the poll events */
825 lttng_poll_reset(&events);
7a485870
DG		 826
827 /* Poll infinite value of time */
5eb91c98 828 ret = lttng_poll_wait(&events, -1);
7a485870 829 if (ret < 0) {
7a485870
DG		 830 goto error;
831 } else if (ret == 0) {
832 /* Should not happen since timeout is infinite */
85611738
DG		 833 ERR("Return value of poll is 0 with an infinite timeout.\n"
834 "This should not have happened! Continuing...");
7a485870
DG		 835 continue;
836 }
837
5eb91c98
DG		 838 for (i = 0; i < nb_fd; i++) {
839 /* Fetch once the poll data */
840 revents = LTTNG_POLL_GETEV(&events, i);
841 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 842
5eb91c98
DG		 843 /* Thread quit pipe has been closed. Killing thread. */
844 ret = check_thread_quit_pipe(pollfd, revents);
845 if (ret) {
846 goto error;
847 }
7a485870 848
5eb91c98
DG		 849 /* Check for data on kernel pipe */
850 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
851 ret = read(kernel_poll_pipe[0], &tmp, 1);
852 update_poll_flag = 1;
853 continue;
854 } else {
855 /*
856 * New CPU detected by the kernel. Adding kernel stream to
857 * kernel session and updating the kernel consumer
858 */
859 if (revents & LPOLLIN) {
2bdd86d4 860 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 861 if (ret < 0) {
862 continue;
863 }
864 break;
865 /*
866 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
867 * and unregister kernel stream at this point.
868 */
7a485870 869 }
7a485870
DG		 870 }
871 }
872 }
873
874error:
875 DBG("Kernel thread dying");
273ea72c
DG		 876 close(kernel_poll_pipe[0]);
877 close(kernel_poll_pipe[1]);
5eb91c98
DG		 878
879 lttng_poll_clean(&events);
880
7a485870
DG		 881 return NULL;
882}
883
1d4b027a 884/*
3bd1e081 885 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 886 */
3bd1e081 887static void *thread_manage_consumer(void *data)
1d4b027a 888{
5eb91c98
DG		 889 int sock = 0, i, ret, pollfd;
890 uint32_t revents, nb_fd;
1d4b027a 891 enum lttcomm_return_code code;
5eb91c98 892 struct lttng_poll_event events;
3bd1e081 893 struct consumer_data *consumer_data = data;
1d4b027a 894
3bd1e081 895 DBG("[thread] Manage consumer started");
1d4b027a 896
3bd1e081 897 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 898 if (ret < 0) {
899 goto error;
900 }
901
5eb91c98
DG		 902 /*
903 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
904 * Nothing more will be added to this poll set.
905 */
906 ret = create_thread_poll_set(&events, 2);
907 if (ret < 0) {
908 goto error;
909 }
273ea72c 910
3bd1e081 911 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 912 if (ret < 0) {
913 goto error;
914 }
915
916 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 917
918 /* Inifinite blocking call, waiting for transmission */
5eb91c98 919 ret = lttng_poll_wait(&events, -1);
273ea72c 920 if (ret < 0) {
273ea72c
DG		 921 goto error;
922 }
923
5eb91c98
DG		 924 for (i = 0; i < nb_fd; i++) {
925 /* Fetch once the poll data */
926 revents = LTTNG_POLL_GETEV(&events, i);
927 pollfd = LTTNG_POLL_GETFD(&events, i);
928
929 /* Thread quit pipe has been closed. Killing thread. */
930 ret = check_thread_quit_pipe(pollfd, revents);
931 if (ret) {
932 goto error;
933 }
934
935 /* Event on the registration socket */
3bd1e081 936 if (pollfd == consumer_data->err_sock) {
5eb91c98 937 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 938 ERR("consumer err socket poll error");
5eb91c98
DG		 939 goto error;
940 }
941 }
273ea72c
DG		 942 }
943
3bd1e081 944 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 945 if (sock < 0) {
946 goto error;
947 }
948
3bd1e081 949 DBG2("Receiving code from consumer err_sock");
ee0b0061 950
712ea556 951 /* Getting status code from kconsumerd */
54d01ffb
DG		 952 ret = lttcomm_recv_unix_sock(sock, &code,
953 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 954 if (ret <= 0) {
955 goto error;
956 }
957
3bd1e081
MD		 958 if (code == CONSUMERD_COMMAND_SOCK_READY) {
959 consumer_data->cmd_sock =
960 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
961 if (consumer_data->cmd_sock < 0) {
962 sem_post(&consumer_data->sem);
48842b30 963 PERROR("consumer connect");
1d4b027a
DG		 964 goto error;
965 }
966 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 967 sem_post(&consumer_data->sem);
968 DBG("consumer command socket ready");
1d4b027a 969 } else {
3bd1e081 970 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 971 lttcomm_get_readable_code(-code));
972 goto error;
973 }
974
54d01ffb 975 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 976 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 977 if (ret < 0) {
72079cae
DG		 978 goto error;
979 }
980
5eb91c98
DG		 981 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
982 if (ret < 0) {
72079cae 983 goto error;
5eb91c98
DG		 984 }
985
986 /* Update number of fd */
987 nb_fd = LTTNG_POLL_GETNB(&events);
988
989 /* Inifinite blocking call, waiting for transmission */
990 ret = lttng_poll_wait(&events, -1);
991 if (ret < 0) {
72079cae
DG		 992 goto error;
993 }
994
5eb91c98
DG		 995 for (i = 0; i < nb_fd; i++) {
996 /* Fetch once the poll data */
997 revents = LTTNG_POLL_GETEV(&events, i);
998 pollfd = LTTNG_POLL_GETFD(&events, i);
999
1000 /* Thread quit pipe has been closed. Killing thread. */
1001 ret = check_thread_quit_pipe(pollfd, revents);
1002 if (ret) {
1003 goto error;
1004 }
1005
1006 /* Event on the kconsumerd socket */
1007 if (pollfd == sock) {
1008 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1009 ERR("consumer err socket second poll error");
5eb91c98
DG		 1010 goto error;
1011 }
1012 }
1013 }
1014
712ea556 1015 /* Wait for any kconsumerd error */
54d01ffb
DG		 1016 ret = lttcomm_recv_unix_sock(sock, &code,
1017 sizeof(enum lttcomm_return_code));
712ea556 1018 if (ret <= 0) {
3bd1e081 1019 ERR("consumer closed the command socket");
712ea556 1020 goto error;
6f61d021 1021 }
1d4b027a 1022
3bd1e081 1023 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1024
1d4b027a 1025error:
3bd1e081
MD		 1026 DBG("consumer thread dying");
1027 close(consumer_data->err_sock);
1028 close(consumer_data->cmd_sock);
5eb91c98 1029 close(sock);
273ea72c 1030
3bd1e081
MD		 1031 unlink(consumer_data->err_unix_sock_path);
1032 unlink(consumer_data->cmd_unix_sock_path);
1033 consumer_data->pid = 0;
1d4b027a 1034
5eb91c98 1035 lttng_poll_clean(&events);
0177d773 1036
5eb91c98 1037 return NULL;
099e26bd
DG		 1038}
1039
099e26bd
DG		 1040/*
1041 * This thread manage application communication.
1d4b027a
DG		 1042 */
1043static void *thread_manage_apps(void *data)
099e26bd 1044{
5eb91c98
DG		 1045 int i, ret, pollfd;
1046 uint32_t revents, nb_fd;
099e26bd 1047 struct ust_command ust_cmd;
5eb91c98 1048 struct lttng_poll_event events;
099e26bd
DG		 1049
1050 DBG("[thread] Manage application started");
1051
f6a9efaa
DG		 1052 rcu_register_thread();
1053 rcu_thread_online();
1054
5eb91c98
DG		 1055 ret = create_thread_poll_set(&events, 2);
1056 if (ret < 0) {
1057 goto error;
1058 }
099e26bd 1059
5eb91c98
DG		 1060 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1061 if (ret < 0) {
1062 goto error;
1063 }
099e26bd 1064
5eb91c98
DG		 1065 while (1) {
1066 /* Zeroed the events structure */
1067 lttng_poll_reset(&events);
0177d773 1068
5eb91c98 1069 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1070
1071 DBG("Apps thread polling on %d fds", nb_fd);
1072
1073 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1074 ret = lttng_poll_wait(&events, -1);
099e26bd 1075 if (ret < 0) {
099e26bd
DG		 1076 goto error;
1077 }
1078
5eb91c98
DG		 1079 for (i = 0; i < nb_fd; i++) {
1080 /* Fetch once the poll data */
1081 revents = LTTNG_POLL_GETEV(&events, i);
1082 pollfd = LTTNG_POLL_GETFD(&events, i);
1083
1084 /* Thread quit pipe has been closed. Killing thread. */
1085 ret = check_thread_quit_pipe(pollfd, revents);
1086 if (ret) {
099e26bd 1087 goto error;
5eb91c98 1088 }
099e26bd 1089
5eb91c98
DG		 1090 /* Inspect the apps cmd pipe */
1091 if (pollfd == apps_cmd_pipe[0]) {
1092 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1093 ERR("Apps command pipe error");
0177d773 1094 goto error;
5eb91c98
DG		 1095 } else if (revents & LPOLLIN) {
1096 /* Empty pipe */
1097 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1098 if (ret < 0 || ret < sizeof(ust_cmd)) {
1099 perror("read apps cmd pipe");
1100 goto error;
1101 }
099e26bd 1102
5eb91c98 1103 /* Register applicaton to the session daemon */
56fff090 1104 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1105 ust_cmd.sock);
88ff5b7f 1106 if (ret == -ENOMEM) {
5eb91c98 1107 goto error;
88ff5b7f
MD		 1108 } else if (ret < 0) {
1109 break;
5eb91c98
DG		 1110 }
1111
acc7b41b 1112 /*
e0c7ec2b 1113 * Validate UST version compatibility.
acc7b41b 1114 */
e0c7ec2b
DG		 1115 ret = ust_app_validate_version(ust_cmd.sock);
1116 if (ret >= 0) {
1117 /*
1118 * Add channel(s) and event(s) to newly registered apps
1119 * from lttng global UST domain.
1120 */
1121 update_ust_app(ust_cmd.sock);
1122 }
acc7b41b 1123
f2ca2e25 1124 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG		 1125 if (ret < 0) {
1126 /*
1127 * If the registration is not possible, we simply
1128 * unregister the apps and continue
1129 */
56fff090 1130 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1131 } else {
1132 /*
1133 * We just need here to monitor the close of the UST
1134 * socket and poll set monitor those by default.
1135 */
1136 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1137 if (ret < 0) {
1138 goto error;
1139 }
1140
54d01ffb
DG		 1141 DBG("Apps with sock %d added to poll set",
1142 ust_cmd.sock);
5eb91c98 1143 }
487cf67c 1144
5eb91c98 1145 break;
0177d773 1146 }
5eb91c98
DG		 1147 } else {
1148 /*
54d01ffb
DG		 1149 * At this point, we know that a registered application made
1150 * the event at poll_wait.
5eb91c98
DG		 1151 */
1152 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1153 /* Removing from the poll set */
1154 ret = lttng_poll_del(&events, pollfd);
1155 if (ret < 0) {
1156 goto error;
1157 }
099e26bd 1158
b9d9b220 1159 /* Socket closed on remote end. */
56fff090 1160 ust_app_unregister(pollfd);
5eb91c98
DG		 1161 break;
1162 }
099e26bd
DG		 1163 }
1164 }
099e26bd
DG		 1165 }
1166
1167error:
1168 DBG("Application communication apps dying");
1169 close(apps_cmd_pipe[0]);
1170 close(apps_cmd_pipe[1]);
1171
5eb91c98 1172 lttng_poll_clean(&events);
099e26bd 1173
f6a9efaa
DG		 1174 rcu_thread_offline();
1175 rcu_unregister_thread();
099e26bd
DG		 1176 return NULL;
1177}
1178
1179/*
1180 * Dispatch request from the registration threads to the application
1181 * communication thread.
1182 */
1183static void *thread_dispatch_ust_registration(void *data)
1184{
1185 int ret;
1186 struct cds_wfq_node *node;
1187 struct ust_command *ust_cmd = NULL;
1188
1189 DBG("[thread] Dispatch UST command started");
1190
1191 while (!dispatch_thread_exit) {
1192 /* Atomically prepare the queue futex */
1193 futex_nto1_prepare(&ust_cmd_queue.futex);
1194
1195 do {
1196 /* Dequeue command for registration */
1197 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1198 if (node == NULL) {
00a17c97 1199 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1200 /* Continue thread execution */
1201 break;
1202 }
1203
1204 ust_cmd = caa_container_of(node, struct ust_command, node);
1205
2f50c8a3
DG		 1206 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1207 " gid:%d sock:%d name:%s (version %d.%d)",
1208 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1209 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1210 ust_cmd->sock, ust_cmd->reg_msg.name,
1211 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1212 /*
1213 * Inform apps thread of the new application registration. This
1214 * call is blocking so we can be assured that the data will be read
1215 * at some point in time or wait to the end of the world :)
1216 */
1217 ret = write(apps_cmd_pipe[1], ust_cmd,
1218 sizeof(struct ust_command));
1219 if (ret < 0) {
1220 perror("write apps cmd pipe");
1221 if (errno == EBADF) {
1222 /*
1223 * We can't inform the application thread to process
1224 * registration. We will exit or else application
1225 * registration will not occur and tracing will never
1226 * start.
1227 */
1228 goto error;
1229 }
1230 }
1231 free(ust_cmd);
1232 } while (node != NULL);
1233
1234 /* Futex wait on queue. Blocking call on futex() */
1235 futex_nto1_wait(&ust_cmd_queue.futex);
1236 }
1237
1238error:
1239 DBG("Dispatch thread dying");
1240 return NULL;
1241}
1242
1243/*
1244 * This thread manage application registration.
1245 */
1246static void *thread_registration_apps(void *data)
1d4b027a 1247{
5eb91c98
DG		 1248 int sock = 0, i, ret, pollfd;
1249 uint32_t revents, nb_fd;
1250 struct lttng_poll_event events;
099e26bd
DG		 1251 /*
1252 * Get allocated in this thread, enqueued to a global queue, dequeued and
1253 * freed in the manage apps thread.
1254 */
1255 struct ust_command *ust_cmd = NULL;
1d4b027a 1256
099e26bd 1257 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1258
1259 ret = lttcomm_listen_unix_sock(apps_sock);
1260 if (ret < 0) {
1261 goto error;
1262 }
1263
5eb91c98
DG		 1264 /*
1265 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1266 * more will be added to this poll set.
1267 */
1268 ret = create_thread_poll_set(&events, 2);
1269 if (ret < 0) {
1270 goto error;
1271 }
273ea72c 1272
5eb91c98
DG		 1273 /* Add the application registration socket */
1274 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1275 if (ret < 0) {
1276 goto error;
1277 }
273ea72c 1278
1d4b027a 1279 /* Notify all applications to register */
0fdd1e2c
DG		 1280 ret = notify_ust_apps(1);
1281 if (ret < 0) {
1282 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1283 "Execution continues but there might be problem for already\n"
1284 "running applications that wishes to register.");
0fdd1e2c 1285 }
1d4b027a
DG		 1286
1287 while (1) {
1288 DBG("Accepting application registration");
273ea72c 1289
5eb91c98
DG		 1290 nb_fd = LTTNG_POLL_GETNB(&events);
1291
273ea72c 1292 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1293 ret = lttng_poll_wait(&events, -1);
273ea72c 1294 if (ret < 0) {
273ea72c
DG		 1295 goto error;
1296 }
1297
5eb91c98
DG		 1298 for (i = 0; i < nb_fd; i++) {
1299 /* Fetch once the poll data */
1300 revents = LTTNG_POLL_GETEV(&events, i);
1301 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1302
5eb91c98
DG		 1303 /* Thread quit pipe has been closed. Killing thread. */
1304 ret = check_thread_quit_pipe(pollfd, revents);
1305 if (ret) {
90014c57
DG		 1306 goto error;
1307 }
1d4b027a 1308
5eb91c98
DG		 1309 /* Event on the registration socket */
1310 if (pollfd == apps_sock) {
1311 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1312 ERR("Register apps socket poll error");
1313 goto error;
1314 } else if (revents & LPOLLIN) {
1315 sock = lttcomm_accept_unix_sock(apps_sock);
1316 if (sock < 0) {
1317 goto error;
1318 }
099e26bd 1319
5eb91c98 1320 /* Create UST registration command for enqueuing */
ba7f0ae5 1321 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1322 if (ust_cmd == NULL) {
ba7f0ae5 1323 perror("ust command zmalloc");
5eb91c98
DG		 1324 goto error;
1325 }
1d4b027a 1326
5eb91c98
DG		 1327 /*
1328 * Using message-based transmissions to ensure we don't
1329 * have to deal with partially received messages.
1330 */
1331 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1332 sizeof(struct ust_register_msg));
1333 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1334 if (ret < 0) {
1335 perror("lttcomm_recv_unix_sock register apps");
1336 } else {
1337 ERR("Wrong size received on apps register");
1338 }
1339 free(ust_cmd);
1340 close(sock);
1341 continue;
1342 }
099e26bd 1343
5eb91c98 1344 ust_cmd->sock = sock;
099e26bd 1345
5eb91c98
DG		 1346 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1347 " gid:%d sock:%d name:%s (version %d.%d)",
1348 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1349 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1350 ust_cmd->sock, ust_cmd->reg_msg.name,
1351 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1352
5eb91c98
DG		 1353 /*
1354 * Lock free enqueue the registration request. The red pill
54d01ffb 1355 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1356 */
1357 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1358
1359 /*
1360 * Wake the registration queue futex. Implicit memory
1361 * barrier with the exchange in cds_wfq_enqueue.
1362 */
1363 futex_nto1_wake(&ust_cmd_queue.futex);
1364 }
1365 }
90014c57 1366 }
1d4b027a
DG		 1367 }
1368
1369error:
0fdd1e2c
DG		 1370 DBG("UST Registration thread dying");
1371
1372 /* Notify that the registration thread is gone */
1373 notify_ust_apps(0);
1374
1375 close(apps_sock);
1376 close(sock);
273ea72c 1377 unlink(apps_unix_sock_path);
0fdd1e2c 1378
5eb91c98
DG		 1379 lttng_poll_clean(&events);
1380
1d4b027a
DG		 1381 return NULL;
1382}
1383
8c0faa1d 1384/*
3bd1e081 1385 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1386 * exec or it will fails.
8c0faa1d 1387 */
3bd1e081 1388static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1389{
1390 int ret;
ee0b0061
DG		 1391 struct timespec timeout;
1392
1393 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1394 timeout.tv_nsec = 0;
8c0faa1d
DG		 1395
1396 /* Setup semaphore */
3bd1e081 1397 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1398 if (ret < 0) {
3bd1e081 1399 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1400 goto error;
1401 }
8c0faa1d 1402
3bd1e081
MD		 1403 ret = pthread_create(&consumer_data->thread, NULL,
1404 thread_manage_consumer, consumer_data);
8c0faa1d 1405 if (ret != 0) {
3bd1e081 1406 PERROR("pthread_create consumer");
ee0b0061 1407 ret = -1;
8c0faa1d
DG		 1408 goto error;
1409 }
1410
ee0b0061
DG		 1411 /* Get time for sem_timedwait absolute timeout */
1412 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1413 if (ret < 0) {
3bd1e081 1414 PERROR("clock_gettime spawn consumer");
ee0b0061 1415 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1416 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1417 } else {
1418 /* Normal timeout if the gettime was successful */
1419 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1420 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1421 }
8c0faa1d 1422
ee0b0061
DG		 1423 if (ret < 0) {
1424 if (errno == ETIMEDOUT) {
1425 /*
1426 * Call has timed out so we kill the kconsumerd_thread and return
1427 * an error.
1428 */
3bd1e081
MD		 1429 ERR("The consumer thread was never ready. Killing it");
1430 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1431 if (ret < 0) {
3bd1e081 1432 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1433 }
1434 } else {
3bd1e081 1435 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1436 }
1437 goto error;
1438 }
1439
3bd1e081
MD		 1440 pthread_mutex_lock(&consumer_data->pid_mutex);
1441 if (consumer_data->pid == 0) {
712ea556 1442 ERR("Kconsumerd did not start");
3bd1e081 1443 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1444 goto error;
1445 }
3bd1e081 1446 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1447
8c0faa1d
DG		 1448 return 0;
1449
1450error:
1451 return ret;
1452}
1453
d9800920 1454/*
3bd1e081 1455 * Join consumer thread
d9800920 1456 */
3bd1e081 1457static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1458{
1459 void *status;
1460 int ret;
1461
3bd1e081
MD		 1462 if (consumer_data->pid != 0) {
1463 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1464 if (ret) {
3bd1e081 1465 ERR("Error killing consumer daemon");
cf3af59e
MD		 1466 return ret;
1467 }
3bd1e081 1468 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1469 } else {
1470 return 0;
1471 }
1472}
1473
8c0faa1d 1474/*
3bd1e081 1475 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1476 *
d063d709 1477 * Return pid if successful else -1.
8c0faa1d 1478 */
3bd1e081 1479static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1480{
1481 int ret;
1482 pid_t pid;
94c55f17 1483 const char *consumer_to_use;
53086306 1484 const char *verbosity;
94c55f17 1485 struct stat st;
8c0faa1d 1486
3bd1e081 1487 DBG("Spawning consumerd");
c49dc785 1488
8c0faa1d
DG		 1489 pid = fork();
1490 if (pid == 0) {
1491 /*
3bd1e081 1492 * Exec consumerd.
8c0faa1d 1493 */
daee5345 1494 if (opt_verbose_consumer) {
53086306
DG		 1495 verbosity = "--verbose";
1496 } else {
1497 verbosity = "--quiet";
1498 }
3bd1e081
MD		 1499 switch (consumer_data->type) {
1500 case LTTNG_CONSUMER_KERNEL:
94c55f17 1501 /*
c7704d57
DG		 1502 * Find out which consumerd to execute. We will first try the
1503 * 64-bit path, then the sessiond's installation directory, and
1504 * fallback on the 32-bit one,
94c55f17 1505 */
63a799e8
AM		 1506 DBG3("Looking for a kernel consumer at these locations:");
1507 DBG3(" 1) %s", consumerd64_bin);
1508 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1509 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1510 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1511 DBG3("Found location #1");
94c55f17 1512 consumer_to_use = consumerd64_bin;
94c55f17 1513 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1514 DBG3("Found location #2");
94c55f17 1515 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1516 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1517 DBG3("Found location #3");
eb1e0bd4 1518 consumer_to_use = consumerd32_bin;
94c55f17 1519 } else {
63a799e8 1520 DBG("Could not find any valid consumerd executable");
94c55f17
AM		 1521 break;
1522 }
1523 DBG("Using kernel consumer at: %s", consumer_to_use);
1524 execl(consumer_to_use,
1525 "lttng-consumerd", verbosity, "-k",
1526 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1527 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1528 NULL);
3bd1e081 1529 break;
7753dea8
MD		 1530 case LTTNG_CONSUMER64_UST:
1531 {
b1e0b6b6 1532 char *tmpnew = NULL;
8f4905da
MD		 1533
1534 if (consumerd64_libdir[0] != '\0') {
1535 char *tmp;
1536 size_t tmplen;
1537
1538 tmp = getenv("LD_LIBRARY_PATH");
1539 if (!tmp) {
1540 tmp = "";
1541 }
1542 tmplen = strlen("LD_LIBRARY_PATH=")
1543 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1544 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1545 if (!tmpnew) {
1546 ret = -ENOMEM;
1547 goto error;
1548 }
1549 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1550 strcat(tmpnew, consumerd64_libdir);
1551 if (tmp[0] != '\0') {
1552 strcat(tmpnew, ":");
1553 strcat(tmpnew, tmp);
1554 }
1555 ret = putenv(tmpnew);
1556 if (ret) {
1557 ret = -errno;
1558 goto error;
1559 }
1560 }
94c55f17 1561 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1562 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1563 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1564 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1565 NULL);
8f4905da
MD		 1566 if (consumerd64_libdir[0] != '\0') {
1567 free(tmpnew);
1568 }
1569 if (ret) {
1570 goto error;
1571 }
3bd1e081 1572 break;
7753dea8
MD		 1573 }
1574 case LTTNG_CONSUMER32_UST:
1575 {
937dde8e 1576 char *tmpnew = NULL;
8f4905da
MD		 1577
1578 if (consumerd32_libdir[0] != '\0') {
1579 char *tmp;
1580 size_t tmplen;
1581
1582 tmp = getenv("LD_LIBRARY_PATH");
1583 if (!tmp) {
1584 tmp = "";
1585 }
1586 tmplen = strlen("LD_LIBRARY_PATH=")
1587 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1588 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1589 if (!tmpnew) {
1590 ret = -ENOMEM;
1591 goto error;
1592 }
1593 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1594 strcat(tmpnew, consumerd32_libdir);
1595 if (tmp[0] != '\0') {
1596 strcat(tmpnew, ":");
1597 strcat(tmpnew, tmp);
1598 }
1599 ret = putenv(tmpnew);
1600 if (ret) {
1601 ret = -errno;
1602 goto error;
1603 }
1604 }
94c55f17 1605 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1606 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1607 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1608 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1609 NULL);
8f4905da
MD		 1610 if (consumerd32_libdir[0] != '\0') {
1611 free(tmpnew);
1612 }
1613 if (ret) {
1614 goto error;
1615 }
7753dea8
MD		 1616 break;
1617 }
3bd1e081
MD		 1618 default:
1619 perror("unknown consumer type");
1620 exit(EXIT_FAILURE);
1621 }
8c0faa1d
DG		 1622 if (errno != 0) {
1623 perror("kernel start consumer exec");
1624 }
1625 exit(EXIT_FAILURE);
1626 } else if (pid > 0) {
1627 ret = pid;
8c0faa1d 1628 } else {
3bd1e081 1629 perror("start consumer fork");
8c0faa1d 1630 ret = -errno;
8c0faa1d 1631 }
8f4905da 1632error:
8c0faa1d
DG		 1633 return ret;
1634}
1635
693bd40b 1636/*
3bd1e081 1637 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1638 */
3bd1e081 1639static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1640{
1641 int ret;
1642
3bd1e081
MD		 1643 pthread_mutex_lock(&consumer_data->pid_mutex);
1644 if (consumer_data->pid != 0) {
1645 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1646 goto end;
1647 }
693bd40b 1648
3bd1e081 1649 ret = spawn_consumerd(consumer_data);
c49dc785 1650 if (ret < 0) {
3bd1e081
MD		 1651 ERR("Spawning consumerd failed");
1652 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1653 goto error;
693bd40b 1654 }
c49dc785 1655
3bd1e081
MD		 1656 /* Setting up the consumer_data pid */
1657 consumer_data->pid = ret;
48842b30 1658 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1659 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1660
3bd1e081
MD		 1661 DBG2("Spawning consumer control thread");
1662 ret = spawn_consumer_thread(consumer_data);
693bd40b 1663 if (ret < 0) {
3bd1e081 1664 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1665 goto error;
1666 }
1667
c49dc785 1668end:
693bd40b
DG		 1669 return 0;
1670
1671error:
1672 return ret;
1673}
1674
b73401da 1675/*
096102bd 1676 * Check version of the lttng-modules.
b73401da 1677 */
096102bd 1678static int validate_lttng_modules_version(void)
b73401da 1679{
096102bd 1680 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD		 1681}
1682
b73401da 1683/*
096102bd 1684 * Setup necessary data for kernel tracer action.
b73401da 1685 */
096102bd 1686static int init_kernel_tracer(void)
b73401da
DG		 1687{
1688 int ret;
b73401da 1689
096102bd
DG		 1690 /* Modprobe lttng kernel modules */
1691 ret = modprobe_lttng_control();
b73401da 1692 if (ret < 0) {
b73401da
DG		 1693 goto error;
1694 }
1695
096102bd
DG		 1696 /* Open debugfs lttng */
1697 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1698 if (kernel_tracer_fd < 0) {
1699 DBG("Failed to open %s", module_proc_lttng);
1700 ret = -1;
1701 goto error_open;
b73401da
DG		 1702 }
1703
096102bd
DG		 1704 /* Validate kernel version */
1705 ret = validate_lttng_modules_version();
b73401da 1706 if (ret < 0) {
096102bd 1707 goto error_version;
b73401da
DG		 1708 }
1709
096102bd 1710 ret = modprobe_lttng_data();
b73401da 1711 if (ret < 0) {
096102bd 1712 goto error_modules;
8c0faa1d
DG		 1713 }
1714
f3ed775e 1715 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG		 1716 return 0;
1717
1718error_version:
1719 modprobe_remove_lttng_control();
1720 close(kernel_tracer_fd);
1721 kernel_tracer_fd = 0;
1722 return LTTCOMM_KERN_VERSION;
1723
1724error_modules:
1725 close(kernel_tracer_fd);
1726
1727error_open:
1728 modprobe_remove_lttng_control();
b73401da
DG		 1729
1730error:
b73401da
DG		 1731 WARN("No kernel tracer available");
1732 kernel_tracer_fd = 0;
096102bd 1733 return LTTCOMM_KERN_NA;
f3ed775e 1734}
33a2b854 1735
f3ed775e 1736/*
54d01ffb 1737 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1738 */
54d01ffb 1739static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1740{
f40799e8 1741 int ret = 0;
8c0faa1d 1742
3bd1e081 1743 if (session->consumer_fds_sent == 0) {
d9800920 1744 /*
54d01ffb
DG		 1745 * Assign default kernel consumer socket if no consumer assigned to the
1746 * kernel session. At this point, it's NOT suppose to be 0 but this is
1747 * an extra security check.
d9800920
DG		 1748 */
1749 if (session->consumer_fd == 0) {
3bd1e081 1750 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1751 }
1752
2bdd86d4 1753 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1754 if (ret < 0) {
f3ed775e
DG		 1755 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1756 goto error;
1757 }
1d4b027a 1758
3bd1e081 1759 session->consumer_fds_sent = 1;
f3ed775e 1760 }
1d4b027a
DG		 1761
1762error:
1763 return ret;
8c0faa1d
DG		 1764}
1765
0177d773
DG		 1766/*
1767 * Create an UST session and add it to the session ust list.
1768 */
44d3bd01 1769static int create_ust_session(struct ltt_session *session,
6df2e2c9 1770 struct lttng_domain *domain)
0177d773 1771{
13384287 1772 struct ltt_ust_session *lus = NULL;
6df2e2c9 1773 int ret;
44d3bd01
DG		 1774
1775 switch (domain->type) {
48842b30 1776 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1777 break;
1778 default:
13384287 1779 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1780 goto error;
1781 }
0177d773
DG		 1782
1783 DBG("Creating UST session");
1784
a991f516 1785 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1786 if (lus == NULL) {
44d3bd01 1787 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1788 goto error;
1789 }
1790
e11d277b 1791 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1792 session->uid, session->gid);
0177d773
DG		 1793 if (ret < 0) {
1794 if (ret != -EEXIST) {
1795 ERR("Trace directory creation error");
44d3bd01 1796 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1797 goto error;
1798 }
1799 }
1800
f6a9efaa
DG		 1801 /* The domain type dictate different actions on session creation */
1802 switch (domain->type) {
48842b30
DG		 1803 case LTTNG_DOMAIN_UST:
1804 /* No ustctl for the global UST domain */
1805 break;
1806 default:
36dc12cc 1807 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1808 goto error;
0177d773 1809 }
6df2e2c9
MD		 1810 lus->uid = session->uid;
1811 lus->gid = session->gid;
f6a9efaa 1812 session->ust_session = lus;
44d3bd01
DG		 1813
1814 return LTTCOMM_OK;
0177d773
DG		 1815
1816error:
1817 free(lus);
1818 return ret;
1819}
1820
333f285e 1821/*
d063d709 1822 * Create a kernel tracer session then create the default channel.
333f285e 1823 */
6df2e2c9 1824static int create_kernel_session(struct ltt_session *session)
333f285e 1825{
f3ed775e 1826 int ret;
f3ed775e
DG		 1827
1828 DBG("Creating kernel session");
1829
1830 ret = kernel_create_session(session, kernel_tracer_fd);
1831 if (ret < 0) {
1832 ret = LTTCOMM_KERN_SESS_FAIL;
1833 goto error;
333f285e
DG		 1834 }
1835
d9800920 1836 /* Set kernel consumer socket fd */
3bd1e081
MD		 1837 if (kconsumer_data.cmd_sock) {
1838 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1839 }
1840
e11d277b 1841 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1842 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1843 if (ret < 0) {
996b65c8 1844 if (ret != -EEXIST) {
7a485870
DG		 1845 ERR("Trace directory creation error");
1846 goto error;
1847 }
1848 }
6df2e2c9
MD		 1849 session->kernel_session->uid = session->uid;
1850 session->kernel_session->gid = session->gid;
7a485870 1851
f3ed775e
DG		 1852error:
1853 return ret;
333f285e
DG		 1854}
1855
8e0af1b4 1856/*
c7704d57
DG		 1857 * Check if the UID or GID match the session. Root user has access to all
1858 * sessions.
8e0af1b4 1859 */
c7704d57 1860static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1861{
c7704d57 1862 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD		 1863 return 0;
1864 } else {
1865 return 1;
1866 }
1867}
1868
1869static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1870{
1871 unsigned int i = 0;
1872 struct ltt_session *session;
1873
1874 DBG("Counting number of available session for UID %d GID %d",
1875 uid, gid);
1876 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1877 /*
1878 * Only list the sessions the user can control.
1879 */
1880 if (!session_access_ok(session, uid, gid)) {
1881 continue;
1882 }
1883 i++;
1884 }
1885 return i;
1886}
1887
6c9cc2ab
DG		 1888/*
1889 * Using the session list, filled a lttng_session array to send back to the
1890 * client for session listing.
1891 *
1892 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1893 * session_lock_list() and session_unlock_list().
6c9cc2ab 1894 */
c7704d57
DG		 1895static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1896 gid_t gid)
6c9cc2ab 1897{
8e0af1b4 1898 unsigned int i = 0;
6c9cc2ab
DG		 1899 struct ltt_session *session;
1900
8e0af1b4
MD		 1901 DBG("Getting all available session for UID %d GID %d",
1902 uid, gid);
6c9cc2ab
DG		 1903 /*
1904 * Iterate over session list and append data after the control struct in
1905 * the buffer.
1906 */
1907 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD		 1908 /*
1909 * Only list the sessions the user can control.
1910 */
1911 if (!session_access_ok(session, uid, gid)) {
1912 continue;
1913 }
6c9cc2ab 1914 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1915 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1916 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1917 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1918 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1919 i++;
1920 }
1921}
1922
9f19cc17
DG		 1923/*
1924 * Fill lttng_channel array of all channels.
1925 */
b551a063 1926static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1927 struct lttng_channel *channels)
1928{
1929 int i = 0;
1930 struct ltt_kernel_channel *kchan;
1931
1932 DBG("Listing channels for session %s", session->name);
1933
b551a063
DG		 1934 switch (domain) {
1935 case LTTNG_DOMAIN_KERNEL:
1936 /* Kernel channels */
1937 if (session->kernel_session != NULL) {
1938 cds_list_for_each_entry(kchan,
1939 &session->kernel_session->channel_list.head, list) {
1940 /* Copy lttng_channel struct to array */
1941 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1942 channels[i].enabled = kchan->enabled;
1943 i++;
1944 }
1945 }
1946 break;
1947 case LTTNG_DOMAIN_UST:
1948 {
bec39940 1949 struct lttng_ht_iter iter;
b551a063
DG		 1950 struct ltt_ust_channel *uchan;
1951
bec39940
DG		 1952 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1953 &iter.iter, uchan, node.node) {
b551a063
DG		 1954 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1955 channels[i].attr.overwrite = uchan->attr.overwrite;
1956 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1957 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1958 channels[i].attr.switch_timer_interval =
1959 uchan->attr.switch_timer_interval;
1960 channels[i].attr.read_timer_interval =
1961 uchan->attr.read_timer_interval;
aea829b3 1962 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 1963 switch (uchan->attr.output) {
1964 case LTTNG_UST_MMAP:
1965 default:
1966 channels[i].attr.output = LTTNG_EVENT_MMAP;
1967 break;
1968 }
befe0905 1969 i++;
b551a063
DG		 1970 }
1971 break;
1972 }
1973 default:
1974 break;
1975 }
1976}
1977
1978/*
1979 * Create a list of ust global domain events.
1980 */
1981static int list_lttng_ust_global_events(char *channel_name,
1982 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1983{
1984 int i = 0, ret = 0;
1985 unsigned int nb_event = 0;
bec39940
DG		 1986 struct lttng_ht_iter iter;
1987 struct lttng_ht_node_str *node;
b551a063
DG		 1988 struct ltt_ust_channel *uchan;
1989 struct ltt_ust_event *uevent;
1990 struct lttng_event *tmp;
1991
1992 DBG("Listing UST global events for channel %s", channel_name);
1993
1994 rcu_read_lock();
1995
bec39940
DG		 1996 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
1997 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG		 1998 if (node == NULL) {
1999 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2000 goto error;
b551a063
DG		 2001 }
2002
bec39940 2003 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2004
bec39940 2005 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2006
b551a063
DG		 2007 if (nb_event == 0) {
2008 ret = nb_event;
2009 goto error;
2010 }
2011
2012 DBG3("Listing UST global %d events", nb_event);
2013
2014 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2015 if (tmp == NULL) {
2016 ret = -LTTCOMM_FATAL;
2017 goto error;
2018 }
2019
bec39940 2020 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG		 2021 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2022 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2023 tmp[i].enabled = uevent->enabled;
2024 switch (uevent->attr.instrumentation) {
2025 case LTTNG_UST_TRACEPOINT:
2026 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2027 break;
2028 case LTTNG_UST_PROBE:
2029 tmp[i].type = LTTNG_EVENT_PROBE;
2030 break;
2031 case LTTNG_UST_FUNCTION:
2032 tmp[i].type = LTTNG_EVENT_FUNCTION;
2033 break;
0cda4f28 2034 }
8005f29a 2035 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2036 switch (uevent->attr.loglevel_type) {
8005f29a
MD		 2037 case LTTNG_UST_LOGLEVEL_ALL:
2038 tmp[i].type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2039 break;
8005f29a
MD		 2040 case LTTNG_UST_LOGLEVEL_RANGE:
2041 tmp[i].type = LTTNG_EVENT_LOGLEVEL_RANGE;
2042 break;
2043 case LTTNG_UST_LOGLEVEL_SINGLE:
2044 tmp[i].type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2045 break;
9f19cc17 2046 }
d7b75b30 2047 i++;
9f19cc17
DG		 2048 }
2049
b551a063
DG		 2050 ret = nb_event;
2051 *events = tmp;
2052
2053error:
2054 rcu_read_unlock();
2055 return ret;
9f19cc17
DG		 2056}
2057
2058/*
b551a063 2059 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2060 */
b551a063
DG		 2061static int list_lttng_kernel_events(char *channel_name,
2062 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2063{
b551a063
DG		 2064 int i = 0, ret;
2065 unsigned int nb_event;
9f19cc17 2066 struct ltt_kernel_event *event;
b551a063
DG		 2067 struct ltt_kernel_channel *kchan;
2068
2069 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2070 if (kchan == NULL) {
2071 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2072 goto error;
2073 }
2074
2075 nb_event = kchan->event_count;
9f19cc17
DG		 2076
2077 DBG("Listing events for channel %s", kchan->channel->name);
2078
b551a063
DG		 2079 if (nb_event == 0) {
2080 ret = nb_event;
2081 goto error;
2082 }
2083
2084 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2085 if (*events == NULL) {
2086 ret = LTTCOMM_FATAL;
2087 goto error;
2088 }
2089
9f19cc17
DG		 2090 /* Kernel channels */
2091 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2092 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2093 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2094 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2095 switch (event->event->instrumentation) {
2096 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2097 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2098 break;
2099 case LTTNG_KERNEL_KPROBE:
2100 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2101 (*events)[i].type = LTTNG_EVENT_PROBE;
2102 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2103 sizeof(struct lttng_kernel_kprobe));
2104 break;
2105 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2106 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2107 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2108 sizeof(struct lttng_kernel_function));
2109 break;
0133c199 2110 case LTTNG_KERNEL_NOOP:
b551a063 2111 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2112 break;
a54bd42d 2113 case LTTNG_KERNEL_SYSCALL:
b551a063 2114 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2115 break;
7a3d1328
MD		 2116 case LTTNG_KERNEL_ALL:
2117 assert(0);
2118 break;
9f19cc17
DG		 2119 }
2120 i++;
2121 }
b551a063
DG		 2122
2123 return nb_event;
2124
2125error:
2126 return ret;
9f19cc17
DG		 2127}
2128
fac6795d 2129/*
54d01ffb 2130 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2131 */
54d01ffb
DG		 2132static int cmd_disable_channel(struct ltt_session *session,
2133 int domain, char *channel_name)
fac6795d 2134{
54d01ffb 2135 int ret;
78f0bacd
DG		 2136 struct ltt_ust_session *usess;
2137
2138 usess = session->ust_session;
379473d2 2139
54d01ffb 2140 switch (domain) {
78f0bacd
DG		 2141 case LTTNG_DOMAIN_KERNEL:
2142 {
2143 ret = channel_kernel_disable(session->kernel_session,
2144 channel_name);
2145 if (ret != LTTCOMM_OK) {
2146 goto error;
2147 }
54d01ffb 2148
78f0bacd
DG		 2149 kernel_wait_quiescent(kernel_tracer_fd);
2150 break;
2151 }
2152 case LTTNG_DOMAIN_UST:
2153 {
2154 struct ltt_ust_channel *uchan;
bec39940 2155 struct lttng_ht *chan_ht;
78f0bacd 2156
7885e399
DG		 2157 chan_ht = usess->domain_global.channels;
2158
2159 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2160 if (uchan == NULL) {
2161 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2162 goto error;
78f0bacd
DG		 2163 }
2164
7885e399
DG		 2165 ret = channel_ust_disable(usess, domain, uchan);
2166 if (ret != LTTCOMM_OK) {
78f0bacd
DG		 2167 goto error;
2168 }
78f0bacd
DG		 2169 break;
2170 }
d78d6610 2171#if 0
78f0bacd
DG		 2172 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2173 case LTTNG_DOMAIN_UST_EXEC_NAME:
2174 case LTTNG_DOMAIN_UST_PID:
d78d6610 2175#endif
78f0bacd
DG		 2176 default:
2177 ret = LTTCOMM_UNKNOWN_DOMAIN;
2178 goto error;
20fe2104
DG		 2179 }
2180
54d01ffb 2181 ret = LTTCOMM_OK;
d65106b1 2182
54d01ffb
DG		 2183error:
2184 return ret;
2185}
2186
2187/*
2188 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2189 */
44d3bd01 2190static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2191 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2192{
2193 int ret;
f6a9efaa 2194 struct ltt_ust_session *usess = session->ust_session;
bec39940 2195 struct lttng_ht *chan_ht;
f6a9efaa 2196
5d56b5aa 2197 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2198
aea829b3 2199 switch (domain) {
44d3bd01
DG		 2200 case LTTNG_DOMAIN_KERNEL:
2201 {
2202 struct ltt_kernel_channel *kchan;
54d01ffb 2203
44d3bd01
DG		 2204 kchan = trace_kernel_get_channel_by_name(attr->name,
2205 session->kernel_session);
2206 if (kchan == NULL) {
2207 ret = channel_kernel_create(session->kernel_session,
2208 attr, kernel_poll_pipe[1]);
2209 } else {
2210 ret = channel_kernel_enable(session->kernel_session, kchan);
2211 }
2212
2213 if (ret != LTTCOMM_OK) {
2214 goto error;
2215 }
2216
2217 kernel_wait_quiescent(kernel_tracer_fd);
2218 break;
2219 }
f6a9efaa
DG		 2220 case LTTNG_DOMAIN_UST:
2221 {
2222 struct ltt_ust_channel *uchan;
2223
7885e399 2224 chan_ht = usess->domain_global.channels;
f6a9efaa 2225
7885e399 2226 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2227 if (uchan == NULL) {
7885e399 2228 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2229 } else {
7885e399 2230 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2231 }
f6a9efaa
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:
44d3bd01 2237 case LTTNG_DOMAIN_UST_PID:
d78d6610 2238#endif
44d3bd01
DG		 2239 default:
2240 ret = LTTCOMM_UNKNOWN_DOMAIN;
2241 goto error;
54d01ffb
DG		 2242 }
2243
54d01ffb
DG		 2244error:
2245 return ret;
2246}
2247
2248/*
2249 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2250 */
2251static int cmd_disable_event(struct ltt_session *session, int domain,
2252 char *channel_name, char *event_name)
2253{
2254 int ret;
54d01ffb
DG		 2255
2256 switch (domain) {
2257 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2258 {
2259 struct ltt_kernel_channel *kchan;
b0a40d28 2260 struct ltt_kernel_session *ksess;
2bdd86d4 2261
b0a40d28
DG		 2262 ksess = session->kernel_session;
2263
2264 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2265 if (kchan == NULL) {
2266 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2267 goto error;
d65106b1
DG		 2268 }
2269
b0a40d28 2270 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2271 if (ret != LTTCOMM_OK) {
2272 goto error;
2273 }
2274
2275 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2276 break;
2bdd86d4
MD		 2277 }
2278 case LTTNG_DOMAIN_UST:
b0a40d28 2279 {
b0a40d28 2280 struct ltt_ust_channel *uchan;
7f79d3a1 2281 struct ltt_ust_session *usess;
b0a40d28
DG		 2282
2283 usess = session->ust_session;
2284
2285 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2286 channel_name);
2287 if (uchan == NULL) {
2288 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2289 goto error;
2290 }
2291
7f79d3a1
DG		 2292 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2293 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2294 goto error;
2295 }
2296
7f79d3a1 2297 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2298 channel_name);
b0a40d28
DG		 2299 break;
2300 }
d78d6610 2301#if 0
2bdd86d4
MD		 2302 case LTTNG_DOMAIN_UST_EXEC_NAME:
2303 case LTTNG_DOMAIN_UST_PID:
2304 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2305#endif
54d01ffb 2306 default:
1ab1ea0b 2307 ret = LTTCOMM_UND;
54d01ffb 2308 goto error;
d65106b1 2309 }
26cc6b4e 2310
54d01ffb
DG		 2311 ret = LTTCOMM_OK;
2312
2313error:
2314 return ret;
2315}
2316
2317/*
2318 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2319 */
2320static int cmd_disable_event_all(struct ltt_session *session, int domain,
2321 char *channel_name)
2322{
2323 int ret;
54d01ffb
DG		 2324
2325 switch (domain) {
2326 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2327 {
2328 struct ltt_kernel_session *ksess;
2329 struct ltt_kernel_channel *kchan;
2330
2331 ksess = session->kernel_session;
2332
2333 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2334 if (kchan == NULL) {
2335 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2336 goto error;
26cc6b4e
DG		 2337 }
2338
9730260e 2339 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2340 if (ret != LTTCOMM_OK) {
0b97ec54 2341 goto error;
26cc6b4e
DG		 2342 }
2343
54d01ffb 2344 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2345 break;
9730260e
DG		 2346 }
2347 case LTTNG_DOMAIN_UST:
2348 {
2349 struct ltt_ust_session *usess;
2350 struct ltt_ust_channel *uchan;
2351
2352 usess = session->ust_session;
2353
2354 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2355 channel_name);
2356 if (uchan == NULL) {
2357 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2358 goto error;
2359 }
2360
7f79d3a1
DG		 2361 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2362 if (ret != 0) {
9730260e
DG		 2363 goto error;
2364 }
2365
7f79d3a1 2366 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2367
2368 break;
2369 }
d78d6610 2370#if 0
9730260e
DG		 2371 case LTTNG_DOMAIN_UST_EXEC_NAME:
2372 case LTTNG_DOMAIN_UST_PID:
2373 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2374#endif
54d01ffb 2375 default:
1ab1ea0b 2376 ret = LTTCOMM_UND;
54d01ffb 2377 goto error;
26cc6b4e 2378 }
e953ef25 2379
54d01ffb 2380 ret = LTTCOMM_OK;
e953ef25 2381
54d01ffb
DG		 2382error:
2383 return ret;
2384}
f5177a38 2385
54d01ffb
DG		 2386/*
2387 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2388 */
2389static int cmd_add_context(struct ltt_session *session, int domain,
2390 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2391{
2392 int ret;
f5177a38 2393
54d01ffb
DG		 2394 switch (domain) {
2395 case LTTNG_DOMAIN_KERNEL:
2396 /* Add kernel context to kernel tracer */
2397 ret = context_kernel_add(session->kernel_session, ctx,
2398 event_name, channel_name);
2399 if (ret != LTTCOMM_OK) {
f5177a38 2400 goto error;
e953ef25 2401 }
2bdd86d4
MD		 2402 break;
2403 case LTTNG_DOMAIN_UST:
2404 {
55cc08a6 2405 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2406
55cc08a6
DG		 2407 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2408 if (ret != LTTCOMM_OK) {
2409 goto error;
2bdd86d4 2410 }
e953ef25 2411 break;
2bdd86d4 2412 }
d78d6610 2413#if 0
55cc08a6
DG		 2414 case LTTNG_DOMAIN_UST_EXEC_NAME:
2415 case LTTNG_DOMAIN_UST_PID:
2416 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2417#endif
54d01ffb 2418 default:
1ab1ea0b 2419 ret = LTTCOMM_UND;
54d01ffb 2420 goto error;
e953ef25 2421 }
950131af 2422
54d01ffb 2423 ret = LTTCOMM_OK;
950131af 2424
54d01ffb
DG		 2425error:
2426 return ret;
2427}
2428
2429/*
2430 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2431 */
2432static int cmd_enable_event(struct ltt_session *session, int domain,
2433 char *channel_name, struct lttng_event *event)
2434{
2435 int ret;
f6cd6b0f 2436 struct lttng_channel *attr;
48842b30 2437 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2438
2439 switch (domain) {
2440 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2441 {
2442 struct ltt_kernel_channel *kchan;
2443
54d01ffb
DG		 2444 kchan = trace_kernel_get_channel_by_name(channel_name,
2445 session->kernel_session);
2446 if (kchan == NULL) {
f6cd6b0f
DG		 2447 attr = channel_new_default_attr(domain);
2448 if (attr == NULL) {
2449 ret = LTTCOMM_FATAL;
2450 goto error;
2451 }
2452 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2453
54d01ffb 2454 /* This call will notify the kernel thread */
44d3bd01 2455 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2456 attr, kernel_poll_pipe[1]);
54d01ffb 2457 if (ret != LTTCOMM_OK) {
ff4d74e6 2458 free(attr);
f5177a38
DG		 2459 goto error;
2460 }
ff4d74e6 2461 free(attr);
54d01ffb 2462 }
950131af 2463
54d01ffb
DG		 2464 /* Get the newly created kernel channel pointer */
2465 kchan = trace_kernel_get_channel_by_name(channel_name,
2466 session->kernel_session);
2467 if (kchan == NULL) {
2468 /* This sould not happen... */
2469 ret = LTTCOMM_FATAL;
2470 goto error;
2471 }
f5177a38 2472
48842b30
DG		 2473 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2474 event);
54d01ffb 2475 if (ret != LTTCOMM_OK) {
f5177a38 2476 goto error;
950131af
DG		 2477 }
2478
54d01ffb 2479 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2480 break;
2bdd86d4
MD		 2481 }
2482 case LTTNG_DOMAIN_UST:
2483 {
aea829b3 2484 struct lttng_channel *attr;
edb67388 2485 struct ltt_ust_channel *uchan;
2bdd86d4 2486
edb67388 2487 /* Get channel from global UST domain */
48842b30
DG		 2488 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2489 channel_name);
2490 if (uchan == NULL) {
aea829b3
DG		 2491 /* Create default channel */
2492 attr = channel_new_default_attr(domain);
2493 if (attr == NULL) {
2494 ret = LTTCOMM_FATAL;
2495 goto error;
2496 }
596219f7 2497 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2498 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2499
7885e399 2500 ret = channel_ust_create(usess, domain, attr);
edb67388 2501 if (ret != LTTCOMM_OK) {
ff4d74e6 2502 free(attr);
aea829b3
DG		 2503 goto error;
2504 }
aea829b3
DG		 2505 free(attr);
2506
2507 /* Get the newly created channel reference back */
2508 uchan = trace_ust_find_channel_by_name(
2509 usess->domain_global.channels, channel_name);
2510 if (uchan == NULL) {
2511 /* Something is really wrong */
2512 ret = LTTCOMM_FATAL;
2513 goto error;
2514 }
48842b30 2515 }
2bdd86d4 2516
edb67388 2517 /* At this point, the session and channel exist on the tracer */
edb67388
DG		 2518 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2519 if (ret != LTTCOMM_OK) {
48842b30 2520 goto error;
2bdd86d4
MD		 2521 }
2522 break;
2523 }
d78d6610 2524#if 0
2bdd86d4
MD		 2525 case LTTNG_DOMAIN_UST_EXEC_NAME:
2526 case LTTNG_DOMAIN_UST_PID:
2527 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2528#endif
54d01ffb 2529 default:
1ab1ea0b 2530 ret = LTTCOMM_UND;
54d01ffb 2531 goto error;
950131af 2532 }
d36b8583 2533
54d01ffb 2534 ret = LTTCOMM_OK;
d36b8583 2535
54d01ffb
DG		 2536error:
2537 return ret;
2538}
7d29a247 2539
54d01ffb
DG		 2540/*
2541 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2542 */
2543static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2544 char *channel_name, int event_type)
54d01ffb
DG		 2545{
2546 int ret;
2547 struct ltt_kernel_channel *kchan;
7d29a247 2548
54d01ffb
DG		 2549 switch (domain) {
2550 case LTTNG_DOMAIN_KERNEL:
2551 kchan = trace_kernel_get_channel_by_name(channel_name,
2552 session->kernel_session);
2553 if (kchan == NULL) {
2554 /* This call will notify the kernel thread */
44d3bd01
DG		 2555 ret = channel_kernel_create(session->kernel_session, NULL,
2556 kernel_poll_pipe[1]);
54d01ffb
DG		 2557 if (ret != LTTCOMM_OK) {
2558 goto error;
d36b8583 2559 }
0d0c377a 2560
8f69e5eb
DG		 2561 /* Get the newly created kernel channel pointer */
2562 kchan = trace_kernel_get_channel_by_name(channel_name,
2563 session->kernel_session);
2564 if (kchan == NULL) {
2565 /* This sould not happen... */
2566 ret = LTTCOMM_FATAL;
2567 goto error;
2568 }
2569
54d01ffb 2570 }
0fdd1e2c 2571
7a3d1328 2572 switch (event_type) {
76d45b40 2573 case LTTNG_EVENT_SYSCALL:
7a3d1328 2574 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2575 kchan, kernel_tracer_fd);
7a3d1328 2576 break;
76d45b40 2577 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2578 /*
7a3d1328
MD		 2579 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2580 * events already registered to the channel.
8c9ae521 2581 */
7a3d1328
MD		 2582 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2583 kchan, kernel_tracer_fd);
2584 break;
76d45b40 2585 case LTTNG_EVENT_ALL:
7a3d1328 2586 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2587 ret = event_kernel_enable_all(session->kernel_session,
2588 kchan, kernel_tracer_fd);
7a3d1328
MD		 2589 break;
2590 default:
2591 ret = LTTCOMM_KERN_ENABLE_FAIL;
2592 goto error;
8c9ae521 2593 }
8f69e5eb
DG		 2594
2595 /* Manage return value */
54d01ffb 2596 if (ret != LTTCOMM_OK) {
0d0c377a 2597 goto error;
d36b8583
DG		 2598 }
2599
54d01ffb 2600 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2601 break;
76d45b40
DG		 2602 case LTTNG_DOMAIN_UST:
2603 {
2604 struct lttng_channel *attr;
2605 struct ltt_ust_channel *uchan;
2606 struct ltt_ust_session *usess = session->ust_session;
2607
2608 /* Get channel from global UST domain */
2609 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2610 channel_name);
2611 if (uchan == NULL) {
2612 /* Create default channel */
2613 attr = channel_new_default_attr(domain);
2614 if (attr == NULL) {
2615 ret = LTTCOMM_FATAL;
2616 goto error;
2617 }
2618 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2619 attr->name[NAME_MAX - 1] = '\0';
2620
2621 /* Use the internal command enable channel */
7885e399 2622 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2623 if (ret != LTTCOMM_OK) {
2624 free(attr);
2625 goto error;
2626 }
2627 free(attr);
2628
2629 /* Get the newly created channel reference back */
2630 uchan = trace_ust_find_channel_by_name(
2631 usess->domain_global.channels, channel_name);
2632 if (uchan == NULL) {
2633 /* Something is really wrong */
2634 ret = LTTCOMM_FATAL;
2635 goto error;
2636 }
2637 }
2638
2639 /* At this point, the session and channel exist on the tracer */
2640
2641 switch (event_type) {
2642 case LTTNG_EVENT_ALL:
2643 case LTTNG_EVENT_TRACEPOINT:
2644 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2645 if (ret != LTTCOMM_OK) {
2646 goto error;
2647 }
2648 break;
2649 default:
2650 ret = LTTCOMM_UST_ENABLE_FAIL;
2651 goto error;
2652 }
2653
2654 /* Manage return value */
2655 if (ret != LTTCOMM_OK) {
2656 goto error;
2657 }
2658
2659 break;
2660 }
d78d6610 2661#if 0
76d45b40
DG		 2662 case LTTNG_DOMAIN_UST_EXEC_NAME:
2663 case LTTNG_DOMAIN_UST_PID:
2664 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2665#endif
54d01ffb 2666 default:
1ab1ea0b 2667 ret = LTTCOMM_UND;
54d01ffb 2668 goto error;
d36b8583 2669 }
f3ed775e 2670
54d01ffb
DG		 2671 ret = LTTCOMM_OK;
2672
2673error:
2674 return ret;
2675}
2676
2677/*
2678 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2679 */
2680static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2681{
2682 int ret;
2683 ssize_t nb_events = 0;
2684
2685 switch (domain) {
2686 case LTTNG_DOMAIN_KERNEL:
2687 nb_events = kernel_list_events(kernel_tracer_fd, events);
2688 if (nb_events < 0) {
2689 ret = LTTCOMM_KERN_LIST_FAIL;
2690 goto error;
894be886 2691 }
54d01ffb 2692 break;
b551a063
DG		 2693 case LTTNG_DOMAIN_UST:
2694 nb_events = ust_app_list_events(events);
2695 if (nb_events < 0) {
2696 ret = LTTCOMM_UST_LIST_FAIL;
2697 goto error;
2698 }
2699 break;
54d01ffb 2700 default:
1ab1ea0b 2701 ret = LTTCOMM_UND;
54d01ffb
DG		 2702 goto error;
2703 }
894be886 2704
54d01ffb 2705 return nb_events;
7d29a247 2706
54d01ffb
DG		 2707error:
2708 /* Return negative value to differentiate return code */
2709 return -ret;
2710}
b389abbe 2711
54d01ffb
DG		 2712/*
2713 * Command LTTNG_START_TRACE processed by the client thread.
2714 */
2715static int cmd_start_trace(struct ltt_session *session)
2716{
2717 int ret;
54d01ffb 2718 struct ltt_kernel_session *ksession;
b9d9b220 2719 struct ltt_ust_session *usess;
b389abbe 2720
54d01ffb
DG		 2721 /* Short cut */
2722 ksession = session->kernel_session;
b9d9b220 2723 usess = session->ust_session;
5eb91c98 2724
b9ef1c83
DG		 2725 if (session->enabled) {
2726 ret = LTTCOMM_UST_START_FAIL;
2727 goto error;
2728 }
2729
464dd62d
MD		 2730 session->enabled = 1;
2731
54d01ffb
DG		 2732 /* Kernel tracing */
2733 if (ksession != NULL) {
2bdd86d4
MD		 2734 struct ltt_kernel_channel *kchan;
2735
54d01ffb
DG		 2736 /* Open kernel metadata */
2737 if (ksession->metadata == NULL) {
2738 ret = kernel_open_metadata(ksession, ksession->trace_path);
2739 if (ret < 0) {
2740 ret = LTTCOMM_KERN_META_FAIL;
2741 goto error;
b389abbe 2742 }
54d01ffb 2743 }
7d29a247 2744
54d01ffb
DG		 2745 /* Open kernel metadata stream */
2746 if (ksession->metadata_stream_fd == 0) {
2747 ret = kernel_open_metadata_stream(ksession);
2748 if (ret < 0) {
2749 ERR("Kernel create metadata stream failed");
2750 ret = LTTCOMM_KERN_STREAM_FAIL;
2751 goto error;
2752 }
2753 }
2754
2755 /* For each channel */
2756 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2757 if (kchan->stream_count == 0) {
2758 ret = kernel_open_channel_stream(kchan);
2759 if (ret < 0) {
2760 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2761 goto error;
2762 }
54d01ffb
DG		 2763 /* Update the stream global counter */
2764 ksession->stream_count_global += ret;
7d29a247 2765 }
54d01ffb
DG		 2766 }
2767
2768 /* Setup kernel consumer socket and send fds to it */
2769 ret = init_kernel_tracing(ksession);
2770 if (ret < 0) {
2771 ret = LTTCOMM_KERN_START_FAIL;
2772 goto error;
2773 }
2774
2775 /* This start the kernel tracing */
2776 ret = kernel_start_session(ksession);
2777 if (ret < 0) {
2778 ret = LTTCOMM_KERN_START_FAIL;
2779 goto error;
2780 }
2781
2782 /* Quiescent wait after starting trace */
2783 kernel_wait_quiescent(kernel_tracer_fd);
2784 }
2785
36dc12cc 2786 /* Flag session that trace should start automatically */
b9d9b220
DG		 2787 if (usess) {
2788 usess->start_trace = 1;
36dc12cc 2789
b9d9b220
DG		 2790 ret = ust_app_start_trace_all(usess);
2791 if (ret < 0) {
2792 ret = LTTCOMM_UST_START_FAIL;
2793 goto error;
2794 }
2bdd86d4 2795 }
54d01ffb
DG		 2796
2797 ret = LTTCOMM_OK;
2798
2799error:
2800 return ret;
2801}
2802
2803/*
2804 * Command LTTNG_STOP_TRACE processed by the client thread.
2805 */
2806static int cmd_stop_trace(struct ltt_session *session)
2807{
2808 int ret;
2809 struct ltt_kernel_channel *kchan;
2810 struct ltt_kernel_session *ksession;
8be98f9a 2811 struct ltt_ust_session *usess;
54d01ffb
DG		 2812
2813 /* Short cut */
2814 ksession = session->kernel_session;
8be98f9a 2815 usess = session->ust_session;
54d01ffb 2816
b9ef1c83 2817 if (!session->enabled) {
190df5ac 2818 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG		 2819 goto error;
2820 }
2821
464dd62d
MD		 2822 session->enabled = 0;
2823
54d01ffb
DG		 2824 /* Kernel tracer */
2825 if (ksession != NULL) {
2826 DBG("Stop kernel tracing");
2827
2828 /* Flush all buffers before stopping */
2829 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2830 if (ret < 0) {
2831 ERR("Kernel metadata flush failed");
2832 }
f34daff7 2833
54d01ffb
DG		 2834 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2835 ret = kernel_flush_buffer(kchan);
0d0c377a 2836 if (ret < 0) {
54d01ffb 2837 ERR("Kernel flush buffer error");
7d29a247 2838 }
54d01ffb 2839 }
19e70852 2840
54d01ffb
DG		 2841 ret = kernel_stop_session(ksession);
2842 if (ret < 0) {
2843 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2844 goto error;
f3ed775e 2845 }
54d01ffb
DG		 2846
2847 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2848 }
54d01ffb 2849
8be98f9a
MD		 2850 if (usess) {
2851 usess->start_trace = 0;
2bdd86d4 2852
8be98f9a 2853 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2854 if (ret < 0) {
190df5ac 2855 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD		 2856 goto error;
2857 }
2bdd86d4 2858 }
54d01ffb
DG		 2859
2860 ret = LTTCOMM_OK;
2861
2862error:
2863 return ret;
2864}
2865
2866/*
2867 * Command LTTNG_CREATE_SESSION processed by the client thread.
2868 */
6df2e2c9 2869static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG		 2870{
2871 int ret;
2872
6df2e2c9 2873 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG		 2874 if (ret != LTTCOMM_OK) {
2875 goto error;
2876 }
2877
2878 ret = LTTCOMM_OK;
2879
2880error:
2881 return ret;
2882}
2883
2884/*
2885 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2886 */
2887static int cmd_destroy_session(struct ltt_session *session, char *name)
2888{
2889 int ret;
2890
2891 /* Clean kernel session teardown */
2892 teardown_kernel_session(session);
84cd17c6
MD		 2893 /* UST session teardown */
2894 teardown_ust_session(session);
54d01ffb
DG		 2895
2896 /*
2897 * Must notify the kernel thread here to update it's poll setin order
2898 * to remove the channel(s)' fd just destroyed.
2899 */
2900 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2901 if (ret < 0) {
2902 perror("write kernel poll pipe");
2903 }
2904
271933a4 2905 ret = session_destroy(session);
54d01ffb
DG		 2906
2907 return ret;
2908}
2909
2910/*
2911 * Command LTTNG_CALIBRATE processed by the client thread.
2912 */
2913static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2914{
2915 int ret;
2916
2917 switch (domain) {
2918 case LTTNG_DOMAIN_KERNEL:
33a2b854 2919 {
54d01ffb 2920 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2921
54d01ffb
DG		 2922 kcalibrate.type = calibrate->type;
2923 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2924 if (ret < 0) {
54d01ffb
DG		 2925 ret = LTTCOMM_KERN_ENABLE_FAIL;
2926 goto error;
33a2b854 2927 }
54d01ffb
DG		 2928 break;
2929 }
4466912f
DG		 2930 case LTTNG_DOMAIN_UST:
2931 {
2932 struct lttng_ust_calibrate ucalibrate;
2933
2934 ucalibrate.type = calibrate->type;
2935 ret = ust_app_calibrate_glb(&ucalibrate);
2936 if (ret < 0) {
2937 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2938 goto error;
2939 }
2940 break;
2941 }
54d01ffb 2942 default:
1ab1ea0b 2943 ret = LTTCOMM_UND;
54d01ffb
DG		 2944 goto error;
2945 }
33a2b854 2946
54d01ffb 2947 ret = LTTCOMM_OK;
33a2b854 2948
54d01ffb
DG		 2949error:
2950 return ret;
2951}
7d29a247 2952
54d01ffb
DG		 2953/*
2954 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2955 */
2956static int cmd_register_consumer(struct ltt_session *session, int domain,
2957 char *sock_path)
2958{
2959 int ret, sock;
b389abbe 2960
54d01ffb
DG		 2961 switch (domain) {
2962 case LTTNG_DOMAIN_KERNEL:
2963 /* Can't register a consumer if there is already one */
48c4f28c 2964 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 2965 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2966 goto error;
2967 }
2968
2969 sock = lttcomm_connect_unix_sock(sock_path);
2970 if (sock < 0) {
2971 ret = LTTCOMM_CONNECT_FAIL;
2972 goto error;
2973 }
2974
2975 session->kernel_session->consumer_fd = sock;
2976 break;
2977 default:
2978 /* TODO: Userspace tracing */
1ab1ea0b 2979 ret = LTTCOMM_UND;
54d01ffb
DG		 2980 goto error;
2981 }
2982
2983 ret = LTTCOMM_OK;
2984
2985error:
2986 return ret;
2987}
2988
2989/*
2990 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2991 */
2992static ssize_t cmd_list_domains(struct ltt_session *session,
2993 struct lttng_domain **domains)
2994{
b551a063 2995 int ret, index = 0;
54d01ffb
DG		 2996 ssize_t nb_dom = 0;
2997
2998 if (session->kernel_session != NULL) {
b551a063 2999 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3000 nb_dom++;
3001 }
3002
b551a063
DG		 3003 if (session->ust_session != NULL) {
3004 DBG3("Listing domains found UST global domain");
3005 nb_dom++;
3006 }
54d01ffb 3007
b551a063 3008 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3009 if (*domains == NULL) {
3010 ret = -LTTCOMM_FATAL;
3011 goto error;
3012 }
3013
b551a063
DG		 3014 if (session->kernel_session != NULL) {
3015 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3016 index++;
3017 }
3018
3019 if (session->ust_session != NULL) {
3020 (*domains)[index].type = LTTNG_DOMAIN_UST;
3021 index++;
3022 }
54d01ffb 3023
54d01ffb
DG		 3024 return nb_dom;
3025
3026error:
3027 return ret;
3028}
3029
3030/*
3031 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3032 */
b551a063 3033static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3034 struct lttng_channel **channels)
3035{
3036 int ret;
3037 ssize_t nb_chan = 0;
3038
b551a063
DG		 3039 switch (domain) {
3040 case LTTNG_DOMAIN_KERNEL:
3041 if (session->kernel_session != NULL) {
3042 nb_chan = session->kernel_session->channel_count;
3043 }
0df502fd 3044 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3045 break;
3046 case LTTNG_DOMAIN_UST:
3047 if (session->ust_session != NULL) {
bec39940 3048 nb_chan = lttng_ht_get_count(
b551a063
DG		 3049 session->ust_session->domain_global.channels);
3050 }
0df502fd 3051 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3052 break;
3053 default:
3054 *channels = NULL;
1ab1ea0b 3055 ret = -LTTCOMM_UND;
54d01ffb
DG		 3056 goto error;
3057 }
3058
b551a063
DG		 3059 if (nb_chan > 0) {
3060 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3061 if (*channels == NULL) {
3062 ret = -LTTCOMM_FATAL;
3063 goto error;
3064 }
54d01ffb 3065
b551a063
DG		 3066 list_lttng_channels(domain, session, *channels);
3067 } else {
3068 *channels = NULL;
3069 }
2bdd86d4 3070
54d01ffb
DG		 3071 return nb_chan;
3072
3073error:
3074 return ret;
3075}
3076
3077/*
3078 * Command LTTNG_LIST_EVENTS processed by the client thread.
3079 */
b551a063 3080static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3081 char *channel_name, struct lttng_event **events)
3082{
b551a063 3083 int ret = 0;
54d01ffb 3084 ssize_t nb_event = 0;
54d01ffb 3085
b551a063
DG		 3086 switch (domain) {
3087 case LTTNG_DOMAIN_KERNEL:
3088 if (session->kernel_session != NULL) {
3089 nb_event = list_lttng_kernel_events(channel_name,
3090 session->kernel_session, events);
54d01ffb 3091 }
b551a063
DG		 3092 break;
3093 case LTTNG_DOMAIN_UST:
3094 {
3095 if (session->ust_session != NULL) {
3096 nb_event = list_lttng_ust_global_events(channel_name,
3097 &session->ust_session->domain_global, events);
3098 }
3099 break;
54d01ffb 3100 }
b551a063 3101 default:
1ab1ea0b 3102 ret = -LTTCOMM_UND;
54d01ffb
DG		 3103 goto error;
3104 }
3105
b551a063 3106 ret = nb_event;
54d01ffb
DG		 3107
3108error:
3109 return ret;
3110}
3111
3112/*
3113 * Process the command requested by the lttng client within the command
3114 * context structure. This function make sure that the return structure (llm)
3115 * is set and ready for transmission before returning.
3116 *
3117 * Return any error encountered or 0 for success.
3118 */
3119static int process_client_msg(struct command_ctx *cmd_ctx)
3120{
3121 int ret = LTTCOMM_OK;
44d3bd01 3122 int need_tracing_session = 1;
54d01ffb
DG		 3123
3124 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3125
4fba7219
DG		 3126 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3127 ret = LTTCOMM_KERN_NA;
3128 goto error;
3129 }
3130
54d01ffb
DG		 3131 /*
3132 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3133 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3134 * command.
3135 */
3136 switch(cmd_ctx->lsm->cmd_type) {
3137 case LTTNG_LIST_SESSIONS:
3138 case LTTNG_LIST_TRACEPOINTS:
3139 case LTTNG_LIST_DOMAINS:
3140 case LTTNG_LIST_CHANNELS:
3141 case LTTNG_LIST_EVENTS:
3142 break;
3143 default:
3144 /* Setup lttng message with no payload */
3145 ret = setup_lttng_msg(cmd_ctx, 0);
3146 if (ret < 0) {
3147 /* This label does not try to unlock the session */
3148 goto init_setup_error;
3149 }
3150 }
3151
3152 /* Commands that DO NOT need a session. */
3153 switch (cmd_ctx->lsm->cmd_type) {
3154 case LTTNG_CALIBRATE:
3155 case LTTNG_CREATE_SESSION:
3156 case LTTNG_LIST_SESSIONS:
3157 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3158 need_tracing_session = 0;
54d01ffb
DG		 3159 break;
3160 default:
3161 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3162 session_lock_list();
54d01ffb 3163 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3164 session_unlock_list();
54d01ffb
DG		 3165 if (cmd_ctx->session == NULL) {
3166 if (cmd_ctx->lsm->session.name != NULL) {
3167 ret = LTTCOMM_SESS_NOT_FOUND;
3168 } else {
3169 /* If no session name specified */
3170 ret = LTTCOMM_SELECT_SESS;
3171 }
3172 goto error;
3173 } else {
3174 /* Acquire lock for the session */
3175 session_lock(cmd_ctx->session);
3176 }
3177 break;
3178 }
b389abbe 3179
54d01ffb
DG		 3180 /*
3181 * Check domain type for specific "pre-action".
3182 */
3183 switch (cmd_ctx->lsm->domain.type) {
3184 case LTTNG_DOMAIN_KERNEL:
d1f1c568
DG		 3185 if (!is_root) {
3186 ret = LTTCOMM_KERN_NA;
3187 goto error;
3188 }
3189
54d01ffb
DG		 3190 /* Kernel tracer check */
3191 if (kernel_tracer_fd == 0) {
3192 /* Basically, load kernel tracer modules */
096102bd
DG		 3193 ret = init_kernel_tracer();
3194 if (ret != 0) {
54d01ffb
DG		 3195 goto error;
3196 }
3197 }
5eb91c98 3198
54d01ffb 3199 /* Need a session for kernel command */
44d3bd01 3200 if (need_tracing_session) {
54d01ffb 3201 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 3202 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3203 if (ret < 0) {
54d01ffb 3204 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3205 goto error;
3206 }
b389abbe 3207 }
7d29a247 3208
54d01ffb 3209 /* Start the kernel consumer daemon */
3bd1e081
MD		 3210 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3211 if (kconsumer_data.pid == 0 &&
54d01ffb 3212 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3213 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3214 ret = start_consumerd(&kconsumer_data);
7d29a247 3215 if (ret < 0) {
54d01ffb
DG		 3216 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3217 goto error;
950131af 3218 }
3ff2ecac
MD		 3219 } else {
3220 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3221 }
0d0c377a 3222 }
54d01ffb 3223 break;
2bdd86d4 3224 case LTTNG_DOMAIN_UST:
44d3bd01 3225 {
44d3bd01 3226 if (need_tracing_session) {
f6a9efaa 3227 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3228 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3229 &cmd_ctx->lsm->domain);
44d3bd01
DG		 3230 if (ret != LTTCOMM_OK) {
3231 goto error;
3232 }
3233 }
7753dea8
MD		 3234 /* Start the UST consumer daemons */
3235 /* 64-bit */
3236 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3237 if (consumerd64_bin[0] != '\0' &&
7753dea8 3238 ustconsumer64_data.pid == 0 &&
2bdd86d4 3239 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3240 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3241 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3242 if (ret < 0) {
7753dea8
MD		 3243 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3244 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3245 goto error;
3246 }
48842b30 3247
7753dea8 3248 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3249 } else {
7753dea8
MD		 3250 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3251 }
3252 /* 32-bit */
fc7a59ce 3253 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3254 ustconsumer32_data.pid == 0 &&
3255 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3256 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3257 ret = start_consumerd(&ustconsumer32_data);
3258 if (ret < 0) {
3259 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3260 ust_consumerd32_fd = -EINVAL;
3261 goto error;
3262 }
3263 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3264 } else {
3265 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3266 }
44d3bd01
DG		 3267 }
3268 break;
48842b30 3269 }
54d01ffb 3270 default:
54d01ffb
DG		 3271 break;
3272 }
33a2b854 3273
8e0af1b4
MD		 3274 /*
3275 * Check that the UID or GID match that of the tracing session.
3276 * The root user can interact with all sessions.
3277 */
3278 if (need_tracing_session) {
3279 if (!session_access_ok(cmd_ctx->session,
3280 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3281 ret = LTTCOMM_EPERM;
3282 goto error;
3283 }
3284 }
3285
54d01ffb
DG		 3286 /* Process by command type */
3287 switch (cmd_ctx->lsm->cmd_type) {
3288 case LTTNG_ADD_CONTEXT:
3289 {
3290 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3291 cmd_ctx->lsm->u.context.channel_name,
3292 cmd_ctx->lsm->u.context.event_name,
3293 &cmd_ctx->lsm->u.context.ctx);
3294 break;
3295 }
3296 case LTTNG_DISABLE_CHANNEL:
3297 {
3298 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3299 cmd_ctx->lsm->u.disable.channel_name);
3300 break;
3301 }
3302 case LTTNG_DISABLE_EVENT:
3303 {
3304 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3305 cmd_ctx->lsm->u.disable.channel_name,
3306 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3307 break;
3308 }
54d01ffb
DG		 3309 case LTTNG_DISABLE_ALL_EVENT:
3310 {
2bdd86d4 3311 DBG("Disabling all events");
54d01ffb
DG		 3312
3313 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3314 cmd_ctx->lsm->u.disable.channel_name);
3315 break;
3316 }
3317 case LTTNG_ENABLE_CHANNEL:
3318 {
aea829b3 3319 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3320 &cmd_ctx->lsm->u.channel.chan);
3321 break;
3322 }
3323 case LTTNG_ENABLE_EVENT:
3324 {
3325 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3326 cmd_ctx->lsm->u.enable.channel_name,
3327 &cmd_ctx->lsm->u.enable.event);
3328 break;
3329 }
3330 case LTTNG_ENABLE_ALL_EVENT:
3331 {
2bdd86d4 3332 DBG("Enabling all events");
54d01ffb
DG		 3333
3334 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3335 cmd_ctx->lsm->u.enable.channel_name,
3336 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3337 break;
3338 }
052da939 3339 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3340 {
9f19cc17 3341 struct lttng_event *events;
54d01ffb 3342 ssize_t nb_events;
052da939 3343
54d01ffb
DG		 3344 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3345 if (nb_events < 0) {
3346 ret = -nb_events;
3347 goto error;
2ef84c95
DG		 3348 }
3349
3350 /*
3351 * Setup lttng message with payload size set to the event list size in
3352 * bytes and then copy list into the llm payload.
3353 */
052da939 3354 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3355 if (ret < 0) {
052da939 3356 free(events);
2ef84c95
DG		 3357 goto setup_error;
3358 }
3359
3360 /* Copy event list into message payload */
9f19cc17 3361 memcpy(cmd_ctx->llm->payload, events,
052da939 3362 sizeof(struct lttng_event) * nb_events);
2ef84c95 3363
9f19cc17 3364 free(events);
2ef84c95
DG		 3365
3366 ret = LTTCOMM_OK;
3367 break;
3368 }
f3ed775e 3369 case LTTNG_START_TRACE:
8c0faa1d 3370 {
54d01ffb 3371 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3372 break;
3373 }
f3ed775e 3374 case LTTNG_STOP_TRACE:
8c0faa1d 3375 {
54d01ffb 3376 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3377 break;
3378 }
5e16da05
MD		 3379 case LTTNG_CREATE_SESSION:
3380 {
54d01ffb 3381 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3382 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
5e16da05
MD		 3383 break;
3384 }
3385 case LTTNG_DESTROY_SESSION:
3386 {
54d01ffb
DG		 3387 ret = cmd_destroy_session(cmd_ctx->session,
3388 cmd_ctx->lsm->session.name);
5461b305 3389 break;
5e16da05 3390 }
9f19cc17 3391 case LTTNG_LIST_DOMAINS:
5e16da05 3392 {
54d01ffb
DG		 3393 ssize_t nb_dom;
3394 struct lttng_domain *domains;
5461b305 3395
54d01ffb
DG		 3396 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3397 if (nb_dom < 0) {
3398 ret = -nb_dom;
3399 goto error;
ce3d728c 3400 }
520ff687 3401
54d01ffb 3402 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3403 if (ret < 0) {
3404 goto setup_error;
520ff687 3405 }
57167058 3406
54d01ffb
DG		 3407 /* Copy event list into message payload */
3408 memcpy(cmd_ctx->llm->payload, domains,
3409 nb_dom * sizeof(struct lttng_domain));
3410
3411 free(domains);
5e16da05 3412
5461b305 3413 ret = LTTCOMM_OK;
5e16da05
MD		 3414 break;
3415 }
9f19cc17 3416 case LTTNG_LIST_CHANNELS:
5e16da05 3417 {
54d01ffb
DG		 3418 size_t nb_chan;
3419 struct lttng_channel *channels;
3420
b551a063
DG		 3421 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3422 cmd_ctx->session, &channels);
54d01ffb
DG		 3423 if (nb_chan < 0) {
3424 ret = -nb_chan;
3425 goto error;
5461b305 3426 }
ca95a216 3427
54d01ffb 3428 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3429 if (ret < 0) {
3430 goto setup_error;
3431 }
9f19cc17 3432
54d01ffb
DG		 3433 /* Copy event list into message payload */
3434 memcpy(cmd_ctx->llm->payload, channels,
3435 nb_chan * sizeof(struct lttng_channel));
3436
3437 free(channels);
9f19cc17
DG		 3438
3439 ret = LTTCOMM_OK;
5461b305 3440 break;
5e16da05 3441 }
9f19cc17 3442 case LTTNG_LIST_EVENTS:
5e16da05 3443 {
b551a063 3444 ssize_t nb_event;
684d34d2 3445 struct lttng_event *events = NULL;
9f19cc17 3446
b551a063 3447 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3448 cmd_ctx->lsm->u.list.channel_name, &events);
3449 if (nb_event < 0) {
3450 ret = -nb_event;
3451 goto error;
5461b305 3452 }
ca95a216 3453
54d01ffb 3454 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3455 if (ret < 0) {
3456 goto setup_error;
3457 }
9f19cc17 3458
54d01ffb
DG		 3459 /* Copy event list into message payload */
3460 memcpy(cmd_ctx->llm->payload, events,
3461 nb_event * sizeof(struct lttng_event));
9f19cc17 3462
54d01ffb 3463 free(events);
9f19cc17
DG		 3464
3465 ret = LTTCOMM_OK;
5461b305 3466 break;
5e16da05
MD		 3467 }
3468 case LTTNG_LIST_SESSIONS:
3469 {
8e0af1b4 3470 unsigned int nr_sessions;
5461b305 3471
8e0af1b4
MD		 3472 session_lock_list();
3473 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3474 if (nr_sessions == 0) {
f3ed775e 3475 ret = LTTCOMM_NO_SESSION;
54d01ffb 3476 session_unlock_list();
5461b305 3477 goto error;
57167058 3478 }
8e0af1b4 3479 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3480 if (ret < 0) {
54d01ffb 3481 session_unlock_list();
5461b305 3482 goto setup_error;
e065084a 3483 }
5e16da05 3484
6c9cc2ab 3485 /* Filled the session array */
8e0af1b4
MD		 3486 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3487 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
6c9cc2ab 3488
54d01ffb 3489 session_unlock_list();
5e16da05 3490
5461b305 3491 ret = LTTCOMM_OK;
5e16da05
MD		 3492 break;
3493 }
d0254c7c
MD		 3494 case LTTNG_CALIBRATE:
3495 {
54d01ffb
DG		 3496 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3497 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3498 break;
3499 }
d9800920
DG		 3500 case LTTNG_REGISTER_CONSUMER:
3501 {
54d01ffb
DG		 3502 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3503 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3504 break;
3505 }
5e16da05 3506 default:
5e16da05 3507 ret = LTTCOMM_UND;
5461b305 3508 break;
fac6795d
DG		 3509 }
3510
5461b305 3511error:
5461b305
DG		 3512 if (cmd_ctx->llm == NULL) {
3513 DBG("Missing llm structure. Allocating one.");
894be886 3514 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3515 goto setup_error;
3516 }
3517 }
54d01ffb 3518 /* Set return code */
5461b305 3519 cmd_ctx->llm->ret_code = ret;
5461b305 3520setup_error:
b5541356 3521 if (cmd_ctx->session) {
54d01ffb 3522 session_unlock(cmd_ctx->session);
b5541356 3523 }
54d01ffb 3524init_setup_error:
8028d920 3525 return ret;
fac6795d
DG		 3526}
3527
1d4b027a 3528/*
d063d709
DG		 3529 * This thread manage all clients request using the unix client socket for
3530 * communication.
1d4b027a
DG		 3531 */
3532static void *thread_manage_clients(void *data)
3533{
5eb91c98
DG		 3534 int sock = 0, ret, i, pollfd;
3535 uint32_t revents, nb_fd;
273ea72c 3536 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3537 struct lttng_poll_event events;
1d4b027a
DG		 3538
3539 DBG("[thread] Manage client started");
3540
f6a9efaa
DG		 3541 rcu_register_thread();
3542
1d4b027a
DG		 3543 ret = lttcomm_listen_unix_sock(client_sock);
3544 if (ret < 0) {
3545 goto error;
3546 }
3547
5eb91c98
DG		 3548 /*
3549 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3550 * more will be added to this poll set.
3551 */
3552 ret = create_thread_poll_set(&events, 2);
3553 if (ret < 0) {
3554 goto error;
3555 }
273ea72c 3556
5eb91c98
DG		 3557 /* Add the application registration socket */
3558 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3559 if (ret < 0) {
3560 goto error;
3561 }
273ea72c 3562
bbd973c2
DG		 3563 /*
3564 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3565 */
3566 if (opt_sig_parent) {
8db8d1dc 3567 kill(ppid, SIGUSR1);
1d4b027a
DG		 3568 }
3569
3570 while (1) {
1d4b027a 3571 DBG("Accepting client command ...");
273ea72c 3572
5eb91c98
DG		 3573 nb_fd = LTTNG_POLL_GETNB(&events);
3574
273ea72c 3575 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3576 ret = lttng_poll_wait(&events, -1);
273ea72c 3577 if (ret < 0) {
273ea72c
DG		 3578 goto error;
3579 }
3580
5eb91c98
DG		 3581 for (i = 0; i < nb_fd; i++) {
3582 /* Fetch once the poll data */
3583 revents = LTTNG_POLL_GETEV(&events, i);
3584 pollfd = LTTNG_POLL_GETFD(&events, i);
3585
3586 /* Thread quit pipe has been closed. Killing thread. */
3587 ret = check_thread_quit_pipe(pollfd, revents);
3588 if (ret) {
3589 goto error;
3590 }
3591
3592 /* Event on the registration socket */
3593 if (pollfd == client_sock) {
3594 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3595 ERR("Client socket poll error");
3596 goto error;
3597 }
3598 }
3599 }
3600
3601 DBG("Wait for client response");
3602
3603 sock = lttcomm_accept_unix_sock(client_sock);
3604 if (sock < 0) {
273ea72c 3605 goto error;
273ea72c
DG		 3606 }
3607
be040666
DG		 3608 /* Set socket option for credentials retrieval */
3609 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3610 if (ret < 0) {
3611 goto error;
3612 }
3613
5eb91c98 3614 /* Allocate context command to process the client request */
ba7f0ae5 3615 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3616 if (cmd_ctx == NULL) {
ba7f0ae5 3617 perror("zmalloc cmd_ctx");
1d4b027a 3618 goto error;
5eb91c98 3619 }
1d4b027a 3620
5eb91c98 3621 /* Allocate data buffer for reception */
ba7f0ae5 3622 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3623 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3624 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3625 goto error;
3626 }
1d4b027a 3627
5eb91c98
DG		 3628 cmd_ctx->llm = NULL;
3629 cmd_ctx->session = NULL;
1d4b027a 3630
5eb91c98
DG		 3631 /*
3632 * Data is received from the lttng client. The struct
3633 * lttcomm_session_msg (lsm) contains the command and data request of
3634 * the client.
3635 */
3636 DBG("Receiving data from client ...");
be040666
DG		 3637 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3638 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG		 3639 if (ret <= 0) {
3640 DBG("Nothing recv() from client... continuing");
3641 close(sock);
3642 free(cmd_ctx);
3643 continue;
3644 }
1d4b027a 3645
5eb91c98
DG		 3646 // TODO: Validate cmd_ctx including sanity check for
3647 // security purpose.
f7776ea7 3648
f6a9efaa 3649 rcu_thread_online();
5eb91c98
DG		 3650 /*
3651 * This function dispatch the work to the kernel or userspace tracer
3652 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3653 * informations for the client. The command context struct contains
3654 * everything this function may needs.
3655 */
3656 ret = process_client_msg(cmd_ctx);
f6a9efaa 3657 rcu_thread_offline();
5eb91c98 3658 if (ret < 0) {
bbd973c2 3659 /*
5eb91c98 3660 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3661 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3662 * (ENOMEM). Error detected but still accept command.
bbd973c2 3663 */
bbd973c2 3664 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3665 continue;
3666 }
d6e4fca4 3667
54d01ffb
DG		 3668 DBG("Sending response (size: %d, retcode: %s)",
3669 cmd_ctx->lttng_msg_size,
9a745bc7 3670 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3671 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3672 if (ret < 0) {
3673 ERR("Failed to send data back to client");
bbd973c2 3674 }
1d4b027a 3675
5eb91c98 3676 /* End of transmission */
273ea72c 3677 close(sock);
be040666
DG		 3678
3679 clean_command_ctx(&cmd_ctx);
273ea72c
DG		 3680 }
3681
5eb91c98
DG		 3682error:
3683 DBG("Client thread dying");
273ea72c 3684 unlink(client_unix_sock_path);
5eb91c98
DG		 3685 close(client_sock);
3686 close(sock);
273ea72c 3687
5eb91c98 3688 lttng_poll_clean(&events);
a2fb29a5 3689 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3690
3691 rcu_unregister_thread();
1d4b027a
DG		 3692 return NULL;
3693}
3694
3695
fac6795d
DG		 3696/*
3697 * usage function on stderr
3698 */
3699static void usage(void)
3700{
b716ce68 3701 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3702 fprintf(stderr, " -h, --help Display this usage.\n");
3703 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3704 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3705 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3706 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3707 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3708 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3709 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3710 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3711 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3712 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3713 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3714 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3715 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3716 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3717 fprintf(stderr, " -V, --version Show version number.\n");
3718 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3719 fprintf(stderr, " -q, --quiet No output at all.\n");
3720 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3721 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3722 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3723}
3724
3725/*
3726 * daemon argument parsing
3727 */
3728static int parse_args(int argc, char **argv)
3729{
3730 int c;
3731
3732 static struct option long_options[] = {
3733 { "client-sock", 1, 0, 'c' },
3734 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3735 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3736 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3737 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3738 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3739 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3740 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3741 { "consumerd32-path", 1, 0, 'u' },
3742 { "consumerd32-libdir", 1, 0, 'U' },
3743 { "consumerd64-path", 1, 0, 't' },
3744 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3745 { "daemonize", 0, 0, 'd' },
5b8719f5 3746 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3747 { "help", 0, 0, 'h' },
3748 { "group", 1, 0, 'g' },
3749 { "version", 0, 0, 'V' },
75462a81 3750 { "quiet", 0, 0, 'q' },
3f9947db 3751 { "verbose", 0, 0, 'v' },
3bd1e081 3752 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3753 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3754 { NULL, 0, 0, 0 }
3755 };
3756
3757 while (1) {
3758 int option_index = 0;
4fba7219 3759 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3760 long_options, &option_index);
fac6795d
DG		 3761 if (c == -1) {
3762 break;
3763 }
3764
3765 switch (c) {
3766 case 0:
3767 fprintf(stderr, "option %s", long_options[option_index].name);
3768 if (optarg) {
3769 fprintf(stderr, " with arg %s\n", optarg);
3770 }
3771 break;
b716ce68 3772 case 'c':
fac6795d
DG		 3773 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3774 break;
3775 case 'a':
3776 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3777 break;
3778 case 'd':
3779 opt_daemon = 1;
3780 break;
3781 case 'g':
fb09408a 3782 opt_tracing_group = optarg;
fac6795d
DG		 3783 break;
3784 case 'h':
3785 usage();
3786 exit(EXIT_FAILURE);
3787 case 'V':
3788 fprintf(stdout, "%s\n", VERSION);
3789 exit(EXIT_SUCCESS);
5b8719f5
DG		 3790 case 'S':
3791 opt_sig_parent = 1;
3792 break;
d6f42150 3793 case 'E':
3bd1e081 3794 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3795 break;
3796 case 'C':
3bd1e081
MD		 3797 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3798 break;
3799 case 'F':
7753dea8 3800 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3801 break;
3802 case 'D':
7753dea8
MD		 3803 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3804 break;
3805 case 'H':
3806 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3807 break;
3808 case 'G':
3809 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3810 break;
4fba7219
DG		 3811 case 'N':
3812 opt_no_kernel = 1;
3813 break;
75462a81
DG		 3814 case 'q':
3815 opt_quiet = 1;
3816 break;
3f9947db 3817 case 'v':
53086306
DG		 3818 /* Verbose level can increase using multiple -v */
3819 opt_verbose += 1;
3f9947db 3820 break;
31f73cc9 3821 case 'Z':
3bd1e081 3822 opt_verbose_consumer += 1;
31f73cc9 3823 break;
fb09408a 3824 case 'u':
fc7a59ce 3825 consumerd32_bin= optarg;
ebaeda94
MD		 3826 break;
3827 case 'U':
3828 consumerd32_libdir = optarg;
7753dea8
MD		 3829 break;
3830 case 't':
fc7a59ce 3831 consumerd64_bin = optarg;
ebaeda94
MD		 3832 break;
3833 case 'T':
3834 consumerd64_libdir = optarg;
fb09408a 3835 break;
fac6795d
DG		 3836 default:
3837 /* Unknown option or other error.
3838 * Error is printed by getopt, just return */
3839 return -1;
3840 }
3841 }
3842
3843 return 0;
3844}
3845
3846/*
d063d709 3847 * Creates the two needed socket by the daemon.
d6f42150
DG		 3848 * apps_sock - The communication socket for all UST apps.
3849 * client_sock - The communication of the cli tool (lttng).
fac6795d 3850 */
cf3af59e 3851static int init_daemon_socket(void)
fac6795d
DG		 3852{
3853 int ret = 0;
3854 mode_t old_umask;
3855
3856 old_umask = umask(0);
3857
3858 /* Create client tool unix socket */
d6f42150
DG		 3859 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3860 if (client_sock < 0) {
3861 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3862 ret = -1;
3863 goto end;
3864 }
3865
3866 /* File permission MUST be 660 */
3867 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3868 if (ret < 0) {
d6f42150 3869 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3870 perror("chmod");
3871 goto end;
3872 }
3873
3874 /* Create the application unix socket */
d6f42150
DG		 3875 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3876 if (apps_sock < 0) {
3877 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3878 ret = -1;
3879 goto end;
3880 }
3881
d6f42150 3882 /* File permission MUST be 666 */
54d01ffb
DG		 3883 ret = chmod(apps_unix_sock_path,
3884 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3885 if (ret < 0) {
d6f42150 3886 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3887 perror("chmod");
3888 goto end;
3889 }
3890
3891end:
3892 umask(old_umask);
3893 return ret;
3894}
3895
3896/*
54d01ffb
DG		 3897 * Check if the global socket is available, and if a daemon is answering at the
3898 * other side. If yes, error is returned.
fac6795d 3899 */
cf3af59e 3900static int check_existing_daemon(void)
fac6795d 3901{
7d8234d9 3902 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3903 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3904 return 0;
099e26bd 3905 }
54d01ffb 3906
7d8234d9 3907 /* Is there anybody out there ? */
099e26bd 3908 if (lttng_session_daemon_alive()) {
7d8234d9 3909 return -EEXIST;
099e26bd 3910 } else {
7d8234d9 3911 return 0;
099e26bd 3912 }
fac6795d
DG		 3913}
3914
fac6795d 3915/*
d063d709 3916 * Set the tracing group gid onto the client socket.
5e16da05 3917 *
d063d709
DG		 3918 * Race window between mkdir and chown is OK because we are going from more
3919 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3920 */
be040666 3921static int set_permissions(char *rundir)
fac6795d
DG		 3922{
3923 int ret;
996b65c8 3924 gid_t gid;
fac6795d 3925
996b65c8
MD		 3926 gid = allowed_group();
3927 if (gid < 0) {
be040666
DG		 3928 WARN("No tracing group detected");
3929 ret = 0;
fac6795d
DG		 3930 goto end;
3931 }
3932
d6f42150 3933 /* Set lttng run dir */
be040666 3934 ret = chown(rundir, 0, gid);
d6f42150 3935 if (ret < 0) {
be040666 3936 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 3937 perror("chown");
3938 }
3939
3940 /* lttng client socket path */
996b65c8 3941 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3942 if (ret < 0) {
d6f42150
DG		 3943 ERR("Unable to set group on %s", client_unix_sock_path);
3944 perror("chown");
3945 }
3946
3bd1e081
MD		 3947 /* kconsumer error socket path */
3948 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 3949 if (ret < 0) {
3bd1e081
MD		 3950 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3951 perror("chown");
3952 }
3953
7753dea8
MD		 3954 /* 64-bit ustconsumer error socket path */
3955 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3956 if (ret < 0) {
3957 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3958 perror("chown");
3959 }
3960
3961 /* 32-bit ustconsumer compat32 error socket path */
3962 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 3963 if (ret < 0) {
7753dea8 3964 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 3965 perror("chown");
3966 }
3967
d6f42150 3968 DBG("All permissions are set");
e07ae692 3969
fac6795d
DG		 3970end:
3971 return ret;
3972}
3973
7a485870 3974/*
d063d709 3975 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 3976 */
3977static int create_kernel_poll_pipe(void)
3978{
3979 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3980}
3981
099e26bd
DG		 3982/*
3983 * Create the application command pipe to wake thread_manage_apps.
3984 */
3985static int create_apps_cmd_pipe(void)
3986{
3987 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3988}
3989
d6f42150 3990/*
d063d709 3991 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 3992 */
67e40797 3993static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 3994{
3995 int ret;
3996
67e40797
DG		 3997 DBG3("Creating LTTng run directory: %s", rundir);
3998
3999 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
d6f42150 4000 if (ret < 0) {
b1f11e69 4001 if (errno != EEXIST) {
67e40797 4002 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4003 goto error;
4004 } else {
4005 ret = 0;
4006 }
d6f42150
DG		 4007 }
4008
4009error:
4010 return ret;
4011}
4012
4013/*
d063d709
DG		 4014 * Setup sockets and directory needed by the kconsumerd communication with the
4015 * session daemon.
d6f42150 4016 */
67e40797
DG		 4017static int set_consumer_sockets(struct consumer_data *consumer_data,
4018 const char *rundir)
d6f42150
DG		 4019{
4020 int ret;
67e40797 4021 char path[PATH_MAX];
d6f42150 4022
67e40797 4023 switch (consumer_data->type) {
7753dea8 4024 case LTTNG_CONSUMER_KERNEL:
60922cb0 4025 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD		 4026 break;
4027 case LTTNG_CONSUMER64_UST:
60922cb0 4028 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4029 break;
4030 case LTTNG_CONSUMER32_UST:
60922cb0 4031 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4032 break;
4033 default:
4034 ERR("Consumer type unknown");
4035 ret = -EINVAL;
4036 goto error;
d6f42150
DG		 4037 }
4038
67e40797
DG		 4039 DBG2("Creating consumer directory: %s", path);
4040
3bd1e081 4041 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4042 if (ret < 0) {
6beb2242 4043 if (errno != EEXIST) {
3bd1e081 4044 ERR("Failed to create %s", path);
6beb2242
DG		 4045 goto error;
4046 }
4047 ret = 0;
d6f42150
DG		 4048 }
4049
4050 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4051 consumer_data->err_sock =
4052 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4053 if (consumer_data->err_sock < 0) {
4054 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4055 ret = -1;
4056 goto error;
4057 }
4058
4059 /* File permission MUST be 660 */
3bd1e081 4060 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4061 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4062 if (ret < 0) {
3bd1e081 4063 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4064 PERROR("chmod");
d6f42150
DG		 4065 goto error;
4066 }
4067
4068error:
4069 return ret;
4070}
4071
fac6795d 4072/*
d063d709 4073 * Signal handler for the daemon
cf3af59e 4074 *
54d01ffb
DG		 4075 * Simply stop all worker threads, leaving main() return gracefully after
4076 * joining all threads and calling cleanup().
fac6795d
DG		 4077 */
4078static void sighandler(int sig)
4079{
4080 switch (sig) {
cf3af59e 4081 case SIGPIPE:
af87c45a 4082 DBG("SIGPIPE caught");
cf3af59e
MD		 4083 return;
4084 case SIGINT:
af87c45a 4085 DBG("SIGINT caught");
cf3af59e
MD		 4086 stop_threads();
4087 break;
4088 case SIGTERM:
af87c45a 4089 DBG("SIGTERM caught");
cf3af59e
MD		 4090 stop_threads();
4091 break;
4092 default:
4093 break;
fac6795d 4094 }
fac6795d
DG		 4095}
4096
4097/*
d063d709 4098 * Setup signal handler for :
1d4b027a 4099 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4100 */
1d4b027a 4101static int set_signal_handler(void)
fac6795d 4102{
1d4b027a
DG		 4103 int ret = 0;
4104 struct sigaction sa;
4105 sigset_t sigset;
fac6795d 4106
1d4b027a
DG		 4107 if ((ret = sigemptyset(&sigset)) < 0) {
4108 perror("sigemptyset");
4109 return ret;
4110 }
d6f42150 4111
1d4b027a
DG		 4112 sa.sa_handler = sighandler;
4113 sa.sa_mask = sigset;
4114 sa.sa_flags = 0;
4115 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4116 perror("sigaction");
4117 return ret;
d6f42150
DG		 4118 }
4119
1d4b027a
DG		 4120 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4121 perror("sigaction");
4122 return ret;
d6f42150 4123 }
aaf26714 4124
1d4b027a
DG		 4125 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4126 perror("sigaction");
4127 return ret;
8c0faa1d
DG		 4128 }
4129
1d4b027a
DG		 4130 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4131
4132 return ret;
fac6795d
DG		 4133}
4134
f3ed775e 4135/*
d063d709
DG		 4136 * Set open files limit to unlimited. This daemon can open a large number of
4137 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4138 */
4139static void set_ulimit(void)
4140{
4141 int ret;
4142 struct rlimit lim;
4143
a88df331 4144 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4145 lim.rlim_cur = 65535;
4146 lim.rlim_max = 65535;
4147
4148 ret = setrlimit(RLIMIT_NOFILE, &lim);
4149 if (ret < 0) {
4150 perror("failed to set open files limit");
4151 }
4152}
4153
fac6795d
DG		 4154/*
4155 * main
4156 */
4157int main(int argc, char **argv)
4158{
fac6795d
DG		 4159 int ret = 0;
4160 void *status;
b082db07 4161 const char *home_path;
fac6795d 4162
335a95b7
MD		 4163 init_kernel_workarounds();
4164
f6a9efaa
DG		 4165 rcu_register_thread();
4166
273ea72c 4167 /* Create thread quit pipe */
cf3af59e
MD		 4168 if ((ret = init_thread_quit_pipe()) < 0) {
4169 goto error;
273ea72c
DG		 4170 }
4171
7753dea8 4172 setup_consumerd_path();
fb09408a 4173
fac6795d
DG		 4174 /* Parse arguments */
4175 progname = argv[0];
4176 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4177 goto error;
fac6795d
DG		 4178 }
4179
4180 /* Daemonize */
4181 if (opt_daemon) {
53094c05
DG		 4182 ret = daemon(0, 0);
4183 if (ret < 0) {
4184 perror("daemon");
cf3af59e 4185 goto error;
53094c05 4186 }
fac6795d
DG		 4187 }
4188
4189 /* Check if daemon is UID = 0 */
4190 is_root = !getuid();
4191
fac6795d 4192 if (is_root) {
990570ed 4193 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG		 4194
4195 /* Create global run dir with root access */
4196 ret = create_lttng_rundir(rundir);
d6f42150 4197 if (ret < 0) {
cf3af59e 4198 goto error;
d6f42150
DG		 4199 }
4200
fac6795d 4201 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4202 snprintf(apps_unix_sock_path, PATH_MAX,
4203 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4204 }
4205
4206 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4207 snprintf(client_unix_sock_path, PATH_MAX,
4208 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4209 }
0fdd1e2c
DG		 4210
4211 /* Set global SHM for ust */
4212 if (strlen(wait_shm_path) == 0) {
4213 snprintf(wait_shm_path, PATH_MAX,
4214 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4215 }
67e40797
DG		 4216
4217 /* Setup kernel consumerd path */
4218 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 4219 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 4220 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4221 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG		 4222
4223 DBG2("Kernel consumer err path: %s",
4224 kconsumer_data.err_unix_sock_path);
4225 DBG2("Kernel consumer cmd path: %s",
4226 kconsumer_data.cmd_unix_sock_path);
fac6795d 4227 } else {
b082db07
DG		 4228 home_path = get_home_dir();
4229 if (home_path == NULL) {
273ea72c
DG		 4230 /* TODO: Add --socket PATH option */
4231 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4232 ret = -EPERM;
4233 goto error;
b082db07
DG		 4234 }
4235
67e40797
DG		 4236 /*
4237 * Create rundir from home path. This will create something like
4238 * $HOME/.lttng
4239 */
990570ed 4240 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG		 4241 if (ret < 0) {
4242 ret = -ENOMEM;
4243 goto error;
4244 }
4245
4246 ret = create_lttng_rundir(rundir);
4247 if (ret < 0) {
4248 goto error;
4249 }
4250
fac6795d 4251 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4252 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4253 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4254 }
4255
4256 /* Set the cli tool unix socket path */
4257 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4258 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4259 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4260 }
0fdd1e2c
DG		 4261
4262 /* Set global SHM for ust */
4263 if (strlen(wait_shm_path) == 0) {
4264 snprintf(wait_shm_path, PATH_MAX,
4265 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4266 }
fac6795d
DG		 4267 }
4268
847177cd
DG		 4269 DBG("Client socket path %s", client_unix_sock_path);
4270 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4271 DBG("LTTng run directory path: %s", rundir);
4272
4273 /* 32 bits consumerd path setup */
4274 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 4275 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 4276 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4277 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG		 4278
4279 DBG2("UST consumer 32 bits err path: %s",
4280 ustconsumer32_data.err_unix_sock_path);
4281 DBG2("UST consumer 32 bits cmd path: %s",
4282 ustconsumer32_data.cmd_unix_sock_path);
4283
4284 /* 64 bits consumerd path setup */
4285 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 4286 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 4287 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4288 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG		 4289
4290 DBG2("UST consumer 64 bits err path: %s",
4291 ustconsumer64_data.err_unix_sock_path);
4292 DBG2("UST consumer 64 bits cmd path: %s",
4293 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4294
273ea72c 4295 /*
7d8234d9 4296 * See if daemon already exist.
fac6795d 4297 */
7d8234d9 4298 if ((ret = check_existing_daemon()) < 0) {
75462a81 4299 ERR("Already running daemon.\n");
273ea72c 4300 /*
cf3af59e
MD		 4301 * We do not goto exit because we must not cleanup()
4302 * because a daemon is already running.
ab118b20 4303 */
cf3af59e 4304 goto error;
a88df331
DG		 4305 }
4306
54d01ffb 4307 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4308
4309 /*
4310 * These actions must be executed as root. We do that *after* setting up
4311 * the sockets path because we MUST make the check for another daemon using
4312 * those paths *before* trying to set the kernel consumer sockets and init
4313 * kernel tracer.
4314 */
4315 if (is_root) {
67e40797 4316 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4317 if (ret < 0) {
4318 goto exit;
4319 }
4320
a88df331 4321 /* Setup kernel tracer */
4fba7219
DG		 4322 if (!opt_no_kernel) {
4323 init_kernel_tracer();
4324 }
a88df331
DG		 4325
4326 /* Set ulimit for open files */
4327 set_ulimit();
fac6795d
DG		 4328 }
4329
67e40797
DG		 4330 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4331 if (ret < 0) {
4332 goto exit;
4333 }
4334
4335 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4336 if (ret < 0) {
4337 goto exit;
4338 }
4339
cf3af59e
MD		 4340 if ((ret = set_signal_handler()) < 0) {
4341 goto exit;
fac6795d
DG		 4342 }
4343
d6f42150 4344 /* Setup the needed unix socket */
cf3af59e
MD		 4345 if ((ret = init_daemon_socket()) < 0) {
4346 goto exit;
fac6795d
DG		 4347 }
4348
4349 /* Set credentials to socket */
be040666 4350 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4351 goto exit;
fac6795d
DG		 4352 }
4353
5b8719f5
DG		 4354 /* Get parent pid if -S, --sig-parent is specified. */
4355 if (opt_sig_parent) {
4356 ppid = getppid();
4357 }
4358
7a485870 4359 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4360 if ((ret = create_kernel_poll_pipe()) < 0) {
4361 goto exit;
7a485870
DG		 4362 }
4363
099e26bd
DG		 4364 /* Setup the thread apps communication pipe. */
4365 if ((ret = create_apps_cmd_pipe()) < 0) {
4366 goto exit;
4367 }
4368
4369 /* Init UST command queue. */
4370 cds_wfq_init(&ust_cmd_queue.queue);
4371
f6a9efaa
DG		 4372 /* Init UST app hash table */
4373 ust_app_ht_alloc();
4374
273ea72c 4375 /*
54d01ffb
DG		 4376 * Get session list pointer. This pointer MUST NOT be free(). This list is
4377 * statically declared in session.c
273ea72c 4378 */
54d01ffb 4379 session_list_ptr = session_get_list();
b5541356 4380
5eb91c98
DG		 4381 /* Set up max poll set size */
4382 lttng_poll_set_max_size();
4383
cf3af59e 4384 /* Create thread to manage the client socket */
099e26bd
DG		 4385 ret = pthread_create(&client_thread, NULL,
4386 thread_manage_clients, (void *) NULL);
cf3af59e 4387 if (ret != 0) {
099e26bd 4388 perror("pthread_create clients");
cf3af59e
MD		 4389 goto exit_client;
4390 }
fac6795d 4391
099e26bd
DG		 4392 /* Create thread to dispatch registration */
4393 ret = pthread_create(&dispatch_thread, NULL,
4394 thread_dispatch_ust_registration, (void *) NULL);
4395 if (ret != 0) {
4396 perror("pthread_create dispatch");
4397 goto exit_dispatch;
4398 }
4399
4400 /* Create thread to manage application registration. */
4401 ret = pthread_create(&reg_apps_thread, NULL,
4402 thread_registration_apps, (void *) NULL);
4403 if (ret != 0) {
4404 perror("pthread_create registration");
4405 goto exit_reg_apps;
4406 }
4407
cf3af59e 4408 /* Create thread to manage application socket */
54d01ffb
DG		 4409 ret = pthread_create(&apps_thread, NULL,
4410 thread_manage_apps, (void *) NULL);
cf3af59e 4411 if (ret != 0) {
099e26bd 4412 perror("pthread_create apps");
cf3af59e
MD		 4413 goto exit_apps;
4414 }
fac6795d 4415
cf3af59e 4416 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4417 ret = pthread_create(&kernel_thread, NULL,
4418 thread_manage_kernel, (void *) NULL);
cf3af59e 4419 if (ret != 0) {
099e26bd 4420 perror("pthread_create kernel");
cf3af59e
MD		 4421 goto exit_kernel;
4422 }
7a485870 4423
cf3af59e
MD		 4424 ret = pthread_join(kernel_thread, &status);
4425 if (ret != 0) {
4426 perror("pthread_join");
4427 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4428 }
4429
cf3af59e
MD		 4430exit_kernel:
4431 ret = pthread_join(apps_thread, &status);
4432 if (ret != 0) {
4433 perror("pthread_join");
4434 goto error; /* join error, exit without cleanup */
4435 }
fac6795d 4436
cf3af59e 4437exit_apps:
099e26bd
DG		 4438 ret = pthread_join(reg_apps_thread, &status);
4439 if (ret != 0) {
4440 perror("pthread_join");
4441 goto error; /* join error, exit without cleanup */
4442 }
4443
4444exit_reg_apps:
4445 ret = pthread_join(dispatch_thread, &status);
4446 if (ret != 0) {
4447 perror("pthread_join");
4448 goto error; /* join error, exit without cleanup */
4449 }
4450
4451exit_dispatch:
cf3af59e
MD		 4452 ret = pthread_join(client_thread, &status);
4453 if (ret != 0) {
4454 perror("pthread_join");
4455 goto error; /* join error, exit without cleanup */
4456 }
4457
3bd1e081 4458 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4459 if (ret != 0) {
3bd1e081 4460 perror("join_consumer");
cf3af59e
MD		 4461 goto error; /* join error, exit without cleanup */
4462 }
a88df331 4463
cf3af59e 4464exit_client:
a88df331 4465exit:
cf3af59e
MD		 4466 /*
4467 * cleanup() is called when no other thread is running.
4468 */
f6a9efaa 4469 rcu_thread_online();
cf3af59e 4470 cleanup();
f6a9efaa
DG		 4471 rcu_thread_offline();
4472 rcu_unregister_thread();
67e40797 4473 if (!ret) {
cf3af59e 4474 exit(EXIT_SUCCESS);
67e40797 4475 }
cf3af59e 4476error:
5e16da05 4477 exit(EXIT_FAILURE);
fac6795d 4478}
LTTng 2.0 tools and control repository
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