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Add debug output to sessiond's kernel consumer selection
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD		 1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG		 5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG		 9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG		 14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG		 17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG		 26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG		 33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG		 36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
bec39940 42#include <lttng-ht.h>
e88129fc 43#include <lttng-sessiond-comm.h>
3bd1e081 44#include <lttng/lttng-consumer.h>
2bdd86d4 45
1e307fab 46#include <lttngerr.h>
60b6c79c 47#include <runas.h>
fac6795d 48
54d01ffb 49#include "channel.h"
5eb91c98 50#include "compat/poll.h"
099e26bd 51#include "context.h"
54d01ffb 52#include "event.h"
099e26bd 53#include "futex.h"
4771f025 54#include "kernel.h"
32258573 55#include "lttng-sessiond.h"
0fdd1e2c 56#include "shm.h"
56fff090 57#include "ust-app.h"
1e307fab 58#include "ust-ctl.h"
8e68d1c8 59#include "utils.h"
fac6795d 60
ebaeda94
MD		 61#define CONSUMERD_FILE "lttng-consumerd"
62
3bd1e081
MD		 63struct consumer_data {
64 enum lttng_consumer_type type;
65
66 pthread_t thread; /* Worker thread interacting with the consumer */
67 sem_t sem;
68
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex;
71 pid_t pid;
72
73 int err_sock;
74 int cmd_sock;
75
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path[PATH_MAX];
78 char cmd_unix_sock_path[PATH_MAX];
79};
80
75462a81 81/* Const values */
686204ab 82const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 83const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD		 84const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
85const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
86
fac6795d 87/* Variables */
1d4b027a 88int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 89int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 90int opt_quiet; /* Not static for lttngerr.h */
d063d709 91
fac6795d
DG		 92const char *progname;
93const char *opt_tracing_group;
5b8719f5 94static int opt_sig_parent;
fac6795d 95static int opt_daemon;
4fba7219 96static int opt_no_kernel;
fac6795d 97static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 98static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 99static char *rundir;
3bd1e081
MD		 100
101/* Consumer daemon specific control data */
102static struct consumer_data kconsumer_data = {
103 .type = LTTNG_CONSUMER_KERNEL,
7753dea8
MD		 104 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
105 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 106};
7753dea8
MD		 107static struct consumer_data ustconsumer64_data = {
108 .type = LTTNG_CONSUMER64_UST,
109 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
110 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
111};
112static struct consumer_data ustconsumer32_data = {
113 .type = LTTNG_CONSUMER32_UST,
114 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
115 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 116};
117
099e26bd 118static int dispatch_thread_exit;
fac6795d 119
54d01ffb
DG		 120/* Global application Unix socket path */
121static char apps_unix_sock_path[PATH_MAX];
122/* Global client Unix socket path */
123static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 124/* global wait shm path for UST */
125static char wait_shm_path[PATH_MAX];
fac6795d 126
1d4b027a 127/* Sockets and FDs */
d6f42150
DG		 128static int client_sock;
129static int apps_sock;
20fe2104 130static int kernel_tracer_fd;
7a485870 131static int kernel_poll_pipe[2];
1d4b027a 132
273ea72c
DG		 133/*
134 * Quit pipe for all threads. This permits a single cancellation point
135 * for all threads when receiving an event on the pipe.
136 */
137static int thread_quit_pipe[2];
138
099e26bd
DG		 139/*
140 * This pipe is used to inform the thread managing application communication
141 * that a command is queued and ready to be processed.
142 */
143static int apps_cmd_pipe[2];
144
1d4b027a 145/* Pthread, Mutexes and Semaphores */
1d4b027a 146static pthread_t apps_thread;
099e26bd 147static pthread_t reg_apps_thread;
1d4b027a 148static pthread_t client_thread;
7a485870 149static pthread_t kernel_thread;
099e26bd 150static pthread_t dispatch_thread;
5eb91c98 151
fac6795d 152
099e26bd
DG		 153/*
154 * UST registration command queue. This queue is tied with a futex and uses a N
155 * wakers / 1 waiter implemented and detailed in futex.c/.h
156 *
157 * The thread_manage_apps and thread_dispatch_ust_registration interact with
158 * this queue and the wait/wake scheme.
159 */
160static struct ust_cmd_queue ust_cmd_queue;
161
b5541356
DG		 162/*
163 * Pointer initialized before thread creation.
164 *
165 * This points to the tracing session list containing the session count and a
166 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
167 * MUST NOT be taken if you call a public function in session.c.
04ea676f 168 *
d063d709 169 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 170 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 171 */
172static struct ltt_session_list *session_list_ptr;
173
7753dea8
MD		 174int ust_consumerd64_fd = -1;
175int ust_consumerd32_fd = -1;
176
fc7a59ce
AM		 177static const char *consumerd32_bin =
178 __stringify(CONFIG_CONSUMERD32_BIN);
179static const char *consumerd64_bin =
180 __stringify(CONFIG_CONSUMERD64_BIN);
ebaeda94
MD		 181static const char *consumerd32_libdir =
182 __stringify(CONFIG_CONSUMERD32_LIBDIR);
183static const char *consumerd64_libdir =
184 __stringify(CONFIG_CONSUMERD64_LIBDIR);
fb09408a
MD		 185
186static
7753dea8 187void setup_consumerd_path(void)
fb09408a 188{
fc7a59ce 189 const char *bin, *libdir;
fb09408a 190
7753dea8
MD		 191 /*
192 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 193 * native architecture size consumer if CONFIG_CONSUMER*_PATH
194 * has not been defined.
7753dea8 195 */
ebaeda94 196#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 197 if (!consumerd32_bin[0]) {
198 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 199 }
200 if (!consumerd32_libdir[0]) {
201 consumerd32_libdir = INSTALL_LIB_PATH;
202 }
203#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 204 if (!consumerd64_bin[0]) {
205 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 206 }
ebaeda94
MD		 207 if (!consumerd64_libdir[0]) {
208 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 209 }
210#else
211#error "Unknown bitness"
212#endif
213
fb09408a
MD		 214 /*
215 * runtime env. var. overrides the build default.
216 */
fc7a59ce
AM		 217 bin = getenv("LTTNG_CONSUMERD32_BIN");
218 if (bin) {
219 consumerd32_bin = bin;
7753dea8 220 }
fc7a59ce
AM		 221 bin = getenv("LTTNG_CONSUMERD64_BIN");
222 if (bin) {
223 consumerd64_bin = bin;
ebaeda94
MD		 224 }
225 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
226 if (libdir) {
227 consumerd32_libdir = libdir;
228 }
229 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
230 if (libdir) {
231 consumerd64_libdir = libdir;
fb09408a
MD		 232 }
233}
234
5eb91c98
DG		 235/*
236 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
237 */
238static int create_thread_poll_set(struct lttng_poll_event *events,
239 unsigned int size)
240{
241 int ret;
242
243 if (events == NULL || size == 0) {
244 ret = -1;
245 goto error;
246 }
247
248 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
249 if (ret < 0) {
250 goto error;
251 }
252
253 /* Add quit pipe */
254 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
255 if (ret < 0) {
256 goto error;
257 }
258
259 return 0;
260
261error:
262 return ret;
263}
264
265/*
266 * Check if the thread quit pipe was triggered.
267 *
268 * Return 1 if it was triggered else 0;
269 */
270static int check_thread_quit_pipe(int fd, uint32_t events)
271{
272 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
273 return 1;
274 }
275
276 return 0;
277}
278
0fdd1e2c
DG		 279/*
280 * Remove modules in reverse load order.
281 */
282static int modprobe_remove_kernel_modules(void)
283{
284 int ret = 0, i;
285 char modprobe[256];
286
287 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
288 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 289 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG		 290 kernel_modules_list[i].name);
291 if (ret < 0) {
24b487b8 292 perror("snprintf modprobe -r");
0fdd1e2c
DG		 293 goto error;
294 }
295 modprobe[sizeof(modprobe) - 1] = '\0';
296 ret = system(modprobe);
297 if (ret == -1) {
24b487b8 298 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG		 299 kernel_modules_list[i].name);
300 } else if (kernel_modules_list[i].required
301 && WEXITSTATUS(ret) != 0) {
302 ERR("Unable to remove module %s",
303 kernel_modules_list[i].name);
304 } else {
305 DBG("Modprobe removal successful %s",
306 kernel_modules_list[i].name);
307 }
308 }
309
310error:
311 return ret;
312}
313
314/*
315 * Return group ID of the tracing group or -1 if not found.
316 */
996b65c8
MD		 317static gid_t allowed_group(void)
318{
319 struct group *grp;
320
274e143b
MD		 321 if (opt_tracing_group) {
322 grp = getgrnam(opt_tracing_group);
323 } else {
324 grp = getgrnam(default_tracing_group);
325 }
996b65c8
MD		 326 if (!grp) {
327 return -1;
328 } else {
329 return grp->gr_gid;
330 }
331}
332
273ea72c 333/*
5eb91c98 334 * Init thread quit pipe.
273ea72c
DG		 335 *
336 * Return -1 on error or 0 if all pipes are created.
337 */
338static int init_thread_quit_pipe(void)
339{
340 int ret;
341
342 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
343 if (ret < 0) {
344 perror("thread quit pipe");
345 goto error;
346 }
347
348error:
349 return ret;
350}
351
fac6795d 352/*
d063d709
DG		 353 * Complete teardown of a kernel session. This free all data structure related
354 * to a kernel session and update counter.
fac6795d 355 */
1d4b027a 356static void teardown_kernel_session(struct ltt_session *session)
fac6795d 357{
8f7a84dd
DG		 358 if (!session->kernel_session) {
359 DBG3("No kernel session when tearingdown session");
84ea9c99 360 return;
8f7a84dd
DG		 361 }
362
84ea9c99 363 DBG("Tearing down kernel session");
d9800920 364
84ea9c99
MD		 365 /*
366 * If a custom kernel consumer was registered, close the socket before
367 * tearing down the complete kernel session structure
368 */
369 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
370 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 371 }
84ea9c99
MD		 372
373 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 374}
375
f6a9efaa
DG		 376/*
377 * Complete teardown of all UST sessions. This will free everything on his path
378 * and destroy the core essence of all ust sessions :)
379 */
380static void teardown_ust_session(struct ltt_session *session)
381{
84cd17c6
MD		 382 int ret;
383
8f7a84dd
DG		 384 if (!session->ust_session) {
385 DBG3("No UST session when tearingdown session");
f470a390 386 return;
8f7a84dd
DG		 387 }
388
84ea9c99 389 DBG("Tearing down UST session(s)");
8f7a84dd 390
84cd17c6
MD		 391 ret = ust_app_destroy_trace_all(session->ust_session);
392 if (ret) {
393 ERR("Error in ust_app_destroy_trace_all");
394 }
8f7a84dd 395
f6a9efaa
DG		 396 trace_ust_destroy_session(session->ust_session);
397}
398
099e26bd
DG		 399/*
400 * Stop all threads by closing the thread quit pipe.
401 */
cf3af59e
MD		 402static void stop_threads(void)
403{
5eb91c98
DG		 404 int ret;
405
cf3af59e
MD		 406 /* Stopping all threads */
407 DBG("Terminating all threads");
54d01ffb 408 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 409 if (ret < 0) {
410 ERR("write error on thread quit pipe");
411 }
412
099e26bd
DG		 413 /* Dispatch thread */
414 dispatch_thread_exit = 1;
415 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 416}
417
fac6795d 418/*
d063d709 419 * Cleanup the daemon
fac6795d 420 */
cf3af59e 421static void cleanup(void)
fac6795d 422{
1d4b027a
DG		 423 int ret;
424 char *cmd;
af9737e9 425 struct ltt_session *sess, *stmp;
fac6795d 426
1d4b027a 427 DBG("Cleaning up");
e07ae692 428
67e40797
DG		 429 DBG("Removing %s directory", rundir);
430 ret = asprintf(&cmd, "rm -rf %s", rundir);
431 if (ret < 0) {
432 ERR("asprintf failed. Something is really wrong!");
433 }
5461b305 434
67e40797
DG		 435 /* Remove lttng run directory */
436 ret = system(cmd);
437 if (ret < 0) {
438 ERR("Unable to clean %s", rundir);
1d4b027a 439 }
67e40797 440 free(cmd);
5461b305 441
1d4b027a 442 DBG("Cleaning up all session");
fac6795d 443
b5541356 444 /* Destroy session list mutex */
273ea72c
DG		 445 if (session_list_ptr != NULL) {
446 pthread_mutex_destroy(&session_list_ptr->lock);
447
448 /* Cleanup ALL session */
54d01ffb
DG		 449 cds_list_for_each_entry_safe(sess, stmp,
450 &session_list_ptr->head, list) {
273ea72c 451 teardown_kernel_session(sess);
f6a9efaa
DG		 452 teardown_ust_session(sess);
453 free(sess);
273ea72c
DG		 454 }
455 }
456
099e26bd 457 DBG("Closing all UST sockets");
56fff090 458 ust_app_clean_list();
099e26bd 459
3bd1e081 460 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 461
4fba7219
DG		 462 if (is_root && !opt_no_kernel) {
463 DBG2("Closing kernel fd");
464 close(kernel_tracer_fd);
2f50c8a3
DG		 465 DBG("Unloading kernel modules");
466 modprobe_remove_kernel_modules();
467 }
5eb91c98
DG		 468
469 close(thread_quit_pipe[0]);
470 close(thread_quit_pipe[1]);
421cb601
DG		 471
472 /* <fun> */
f56a39af 473 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG		 474 "Matthew, BEET driven development works!%c[%dm",
475 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
476 /* </fun> */
fac6795d
DG		 477}
478
e065084a 479/*
d063d709 480 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 481 *
d063d709 482 * Return lttcomm error code.
e065084a
DG		 483 */
484static int send_unix_sock(int sock, void *buf, size_t len)
485{
486 /* Check valid length */
487 if (len <= 0) {
488 return -1;
489 }
490
491 return lttcomm_send_unix_sock(sock, buf, len);
492}
493
5461b305 494/*
d063d709 495 * Free memory of a command context structure.
5461b305 496 */
a2fb29a5 497static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 498{
a2fb29a5
DG		 499 DBG("Clean command context structure");
500 if (*cmd_ctx) {
501 if ((*cmd_ctx)->llm) {
502 free((*cmd_ctx)->llm);
5461b305 503 }
a2fb29a5
DG		 504 if ((*cmd_ctx)->lsm) {
505 free((*cmd_ctx)->lsm);
5461b305 506 }
a2fb29a5
DG		 507 free(*cmd_ctx);
508 *cmd_ctx = NULL;
5461b305
DG		 509 }
510}
511
f3ed775e 512/*
d063d709 513 * Send all stream fds of kernel channel to the consumer.
f3ed775e 514 */
2bdd86d4 515static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD		 516 int sock, struct ltt_kernel_channel *channel,
517 uid_t uid, gid_t gid)
f3ed775e
DG		 518{
519 int ret;
f3ed775e 520 struct ltt_kernel_stream *stream;
3bd1e081 521 struct lttcomm_consumer_msg lkm;
f3ed775e 522
3bd1e081 523 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 524 channel->channel->name);
f3ed775e 525
3bd1e081
MD		 526 /* Send channel */
527 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
528 lkm.u.channel.channel_key = channel->fd;
529 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
530 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 531 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 532 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 533 if (ret < 0) {
3bd1e081 534 perror("send consumer channel");
f3ed775e
DG		 535 goto error;
536 }
537
3bd1e081 538 /* Send streams */
7a485870 539 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 540 if (!stream->fd) {
541 continue;
542 }
543 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
544 lkm.u.stream.channel_key = channel->fd;
545 lkm.u.stream.stream_key = stream->fd;
546 lkm.u.stream.state = stream->state;
547 lkm.u.stream.output = channel->channel->attr.output;
548 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 549 lkm.u.stream.uid = uid;
550 lkm.u.stream.gid = gid;
3bd1e081
MD		 551 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
552 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
553 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
554 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
555 if (ret < 0) {
556 perror("send consumer stream");
557 goto error;
558 }
559 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
560 if (ret < 0) {
561 perror("send consumer stream ancillary data");
562 goto error;
f3ed775e
DG		 563 }
564 }
565
3bd1e081 566 DBG("consumer channel streams sent");
f3ed775e
DG		 567
568 return 0;
569
570error:
571 return ret;
572}
573
574/*
d063d709 575 * Send all stream fds of the kernel session to the consumer.
f3ed775e 576 */
2bdd86d4 577static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 578 struct ltt_kernel_session *session)
f3ed775e
DG		 579{
580 int ret;
581 struct ltt_kernel_channel *chan;
3bd1e081
MD		 582 struct lttcomm_consumer_msg lkm;
583 int sock = session->consumer_fd;
7a485870
DG		 584
585 DBG("Sending metadata stream fd");
586
2bdd86d4 587 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 588 if (session->consumer_fd == 0) {
3bd1e081 589 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 590 }
591
7a485870 592 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 593 /* Send metadata channel fd */
594 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
595 lkm.u.channel.channel_key = session->metadata->fd;
596 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
597 lkm.u.channel.mmap_len = 0; /* for kernel */
598 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
599 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
600 if (ret < 0) {
601 perror("send consumer channel");
602 goto error;
603 }
604
605 /* Send metadata stream fd */
606 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
607 lkm.u.stream.channel_key = session->metadata->fd;
608 lkm.u.stream.stream_key = session->metadata_stream_fd;
609 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
610 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
611 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 612 lkm.u.stream.uid = session->uid;
613 lkm.u.stream.gid = session->gid;
3bd1e081
MD		 614 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
615 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
616 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
617 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
618 if (ret < 0) {
619 perror("send consumer stream");
620 goto error;
621 }
622 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 623 if (ret < 0) {
3bd1e081 624 perror("send consumer stream");
7a485870
DG		 625 goto error;
626 }
627 }
f3ed775e 628
f3ed775e 629 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD		 630 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
631 session->uid, session->gid);
2bdd86d4
MD		 632 if (ret < 0) {
633 goto error;
634 }
635 }
636
637 DBG("consumer fds (metadata and channel streams) sent");
638
639 return 0;
640
641error:
642 return ret;
643}
644
fac6795d 645/*
0fdd1e2c 646 * Notify UST applications using the shm mmap futex.
fac6795d 647 */
0fdd1e2c 648static int notify_ust_apps(int active)
fac6795d 649{
0fdd1e2c 650 char *wait_shm_mmap;
fac6795d 651
0fdd1e2c 652 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 653
0fdd1e2c
DG		 654 /* See shm.c for this call implying mmap, shm and futex calls */
655 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
656 if (wait_shm_mmap == NULL) {
fac6795d
DG		 657 goto error;
658 }
659
0fdd1e2c
DG		 660 /* Wake waiting process */
661 futex_wait_update((int32_t *) wait_shm_mmap, active);
662
663 /* Apps notified successfully */
664 return 0;
fac6795d
DG		 665
666error:
0fdd1e2c 667 return -1;
fac6795d
DG		 668}
669
e065084a 670/*
d063d709
DG		 671 * Setup the outgoing data buffer for the response (llm) by allocating the
672 * right amount of memory and copying the original information from the lsm
673 * structure.
ca95a216 674 *
d063d709 675 * Return total size of the buffer pointed by buf.
ca95a216 676 */
5461b305 677static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 678{
f3ed775e 679 int ret, buf_size;
ca95a216 680
f3ed775e 681 buf_size = size;
5461b305 682
ba7f0ae5 683 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 684 if (cmd_ctx->llm == NULL) {
ba7f0ae5 685 perror("zmalloc");
5461b305 686 ret = -ENOMEM;
ca95a216
DG		 687 goto error;
688 }
689
5461b305
DG		 690 /* Copy common data */
691 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 692 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 693
5461b305
DG		 694 cmd_ctx->llm->data_size = size;
695 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
696
ca95a216
DG		 697 return buf_size;
698
699error:
700 return ret;
701}
702
7a485870 703/*
5eb91c98 704 * Update the kernel poll set of all channel fd available over all tracing
d063d709 705 * session. Add the wakeup pipe at the end of the set.
7a485870 706 */
5eb91c98 707static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 708{
5eb91c98 709 int ret;
7a485870
DG		 710 struct ltt_session *session;
711 struct ltt_kernel_channel *channel;
712
5eb91c98 713 DBG("Updating kernel poll set");
7a485870 714
54d01ffb 715 session_lock_list();
b5541356 716 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 717 session_lock(session);
7a485870 718 if (session->kernel_session == NULL) {
54d01ffb 719 session_unlock(session);
7a485870
DG		 720 continue;
721 }
7a485870 722
54d01ffb
DG		 723 cds_list_for_each_entry(channel,
724 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 725 /* Add channel fd to the kernel poll set */
726 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
727 if (ret < 0) {
54d01ffb 728 session_unlock(session);
5eb91c98
DG		 729 goto error;
730 }
731 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 732 }
54d01ffb 733 session_unlock(session);
7a485870 734 }
54d01ffb 735 session_unlock_list();
7a485870 736
5eb91c98 737 return 0;
7a485870
DG		 738
739error:
54d01ffb 740 session_unlock_list();
7a485870
DG		 741 return -1;
742}
743
744/*
54d01ffb 745 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 746 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 747 *
d063d709 748 * Useful for CPU hotplug feature.
7a485870 749 */
2bdd86d4 750static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 751{
752 int ret = 0;
753 struct ltt_session *session;
754 struct ltt_kernel_channel *channel;
755
756 DBG("Updating kernel streams for channel fd %d", fd);
757
54d01ffb 758 session_lock_list();
b5541356 759 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 760 session_lock(session);
7a485870 761 if (session->kernel_session == NULL) {
54d01ffb 762 session_unlock(session);
7a485870
DG		 763 continue;
764 }
d9800920
DG		 765
766 /* This is not suppose to be 0 but this is an extra security check */
767 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 768 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 769 }
770
5eb91c98
DG		 771 cds_list_for_each_entry(channel,
772 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 773 if (channel->fd == fd) {
774 DBG("Channel found, updating kernel streams");
775 ret = kernel_open_channel_stream(channel);
776 if (ret < 0) {
b3c750d2 777 goto error;
7a485870 778 }
d9800920 779
7a485870 780 /*
5eb91c98
DG		 781 * Have we already sent fds to the consumer? If yes, it means
782 * that tracing is started so it is safe to send our updated
783 * stream fds.
7a485870 784 */
3bd1e081 785 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 786 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD		 787 session->kernel_session->consumer_fd, channel,
788 session->uid, session->gid);
7a485870 789 if (ret < 0) {
b3c750d2 790 goto error;
7a485870
DG		 791 }
792 }
b3c750d2 793 goto error;
7a485870
DG		 794 }
795 }
54d01ffb 796 session_unlock(session);
7a485870 797 }
54d01ffb 798 session_unlock_list();
b3c750d2 799 return ret;
7a485870 800
b3c750d2 801error:
54d01ffb
DG		 802 session_unlock(session);
803 session_unlock_list();
7a485870
DG		 804 return ret;
805}
806
487cf67c
DG		 807/*
808 * For each tracing session, update newly registered apps.
809 */
810static void update_ust_app(int app_sock)
811{
812 struct ltt_session *sess, *stmp;
813
814 /* For all tracing session(s) */
815 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG		 816 if (sess->ust_session) {
817 ust_app_global_update(sess->ust_session, app_sock);
818 }
487cf67c
DG		 819 }
820}
821
7a485870 822/*
d063d709 823 * This thread manage event coming from the kernel.
7a485870 824 *
d063d709
DG		 825 * Features supported in this thread:
826 * -) CPU Hotplug
7a485870
DG		 827 */
828static void *thread_manage_kernel(void *data)
829{
5eb91c98
DG		 830 int ret, i, pollfd, update_poll_flag = 1;
831 uint32_t revents, nb_fd;
7a485870 832 char tmp;
5eb91c98 833 struct lttng_poll_event events;
7a485870
DG		 834
835 DBG("Thread manage kernel started");
836
5eb91c98
DG		 837 ret = create_thread_poll_set(&events, 2);
838 if (ret < 0) {
839 goto error;
840 }
841
842 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
843 if (ret < 0) {
844 goto error;
845 }
846
7a485870
DG		 847 while (1) {
848 if (update_poll_flag == 1) {
5f822d0a
DG		 849 /*
850 * Reset number of fd in the poll set. Always 2 since there is the thread
851 * quit pipe and the kernel pipe.
852 */
853 events.nb_fd = 2;
854
5eb91c98
DG		 855 ret = update_kernel_poll(&events);
856 if (ret < 0) {
7a485870
DG		 857 goto error;
858 }
859 update_poll_flag = 0;
860 }
861
5eb91c98
DG		 862 nb_fd = LTTNG_POLL_GETNB(&events);
863
864 DBG("Thread kernel polling on %d fds", nb_fd);
865
866 /* Zeroed the poll events */
867 lttng_poll_reset(&events);
7a485870
DG		 868
869 /* Poll infinite value of time */
5eb91c98 870 ret = lttng_poll_wait(&events, -1);
7a485870 871 if (ret < 0) {
7a485870
DG		 872 goto error;
873 } else if (ret == 0) {
874 /* Should not happen since timeout is infinite */
85611738
DG		 875 ERR("Return value of poll is 0 with an infinite timeout.\n"
876 "This should not have happened! Continuing...");
7a485870
DG		 877 continue;
878 }
879
5eb91c98
DG		 880 for (i = 0; i < nb_fd; i++) {
881 /* Fetch once the poll data */
882 revents = LTTNG_POLL_GETEV(&events, i);
883 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 884
5eb91c98
DG		 885 /* Thread quit pipe has been closed. Killing thread. */
886 ret = check_thread_quit_pipe(pollfd, revents);
887 if (ret) {
888 goto error;
889 }
7a485870 890
5eb91c98
DG		 891 /* Check for data on kernel pipe */
892 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
893 ret = read(kernel_poll_pipe[0], &tmp, 1);
894 update_poll_flag = 1;
895 continue;
896 } else {
897 /*
898 * New CPU detected by the kernel. Adding kernel stream to
899 * kernel session and updating the kernel consumer
900 */
901 if (revents & LPOLLIN) {
2bdd86d4 902 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 903 if (ret < 0) {
904 continue;
905 }
906 break;
907 /*
908 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
909 * and unregister kernel stream at this point.
910 */
7a485870 911 }
7a485870
DG		 912 }
913 }
914 }
915
916error:
917 DBG("Kernel thread dying");
273ea72c
DG		 918 close(kernel_poll_pipe[0]);
919 close(kernel_poll_pipe[1]);
5eb91c98
DG		 920
921 lttng_poll_clean(&events);
922
7a485870
DG		 923 return NULL;
924}
925
1d4b027a 926/*
3bd1e081 927 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 928 */
3bd1e081 929static void *thread_manage_consumer(void *data)
1d4b027a 930{
5eb91c98
DG		 931 int sock = 0, i, ret, pollfd;
932 uint32_t revents, nb_fd;
1d4b027a 933 enum lttcomm_return_code code;
5eb91c98 934 struct lttng_poll_event events;
3bd1e081 935 struct consumer_data *consumer_data = data;
1d4b027a 936
3bd1e081 937 DBG("[thread] Manage consumer started");
1d4b027a 938
3bd1e081 939 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 940 if (ret < 0) {
941 goto error;
942 }
943
5eb91c98
DG		 944 /*
945 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
946 * Nothing more will be added to this poll set.
947 */
948 ret = create_thread_poll_set(&events, 2);
949 if (ret < 0) {
950 goto error;
951 }
273ea72c 952
3bd1e081 953 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 954 if (ret < 0) {
955 goto error;
956 }
957
958 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 959
960 /* Inifinite blocking call, waiting for transmission */
5eb91c98 961 ret = lttng_poll_wait(&events, -1);
273ea72c 962 if (ret < 0) {
273ea72c
DG		 963 goto error;
964 }
965
5eb91c98
DG		 966 for (i = 0; i < nb_fd; i++) {
967 /* Fetch once the poll data */
968 revents = LTTNG_POLL_GETEV(&events, i);
969 pollfd = LTTNG_POLL_GETFD(&events, i);
970
971 /* Thread quit pipe has been closed. Killing thread. */
972 ret = check_thread_quit_pipe(pollfd, revents);
973 if (ret) {
974 goto error;
975 }
976
977 /* Event on the registration socket */
3bd1e081 978 if (pollfd == consumer_data->err_sock) {
5eb91c98 979 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 980 ERR("consumer err socket poll error");
5eb91c98
DG		 981 goto error;
982 }
983 }
273ea72c
DG		 984 }
985
3bd1e081 986 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 987 if (sock < 0) {
988 goto error;
989 }
990
3bd1e081 991 DBG2("Receiving code from consumer err_sock");
ee0b0061 992
712ea556 993 /* Getting status code from kconsumerd */
54d01ffb
DG		 994 ret = lttcomm_recv_unix_sock(sock, &code,
995 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 996 if (ret <= 0) {
997 goto error;
998 }
999
3bd1e081
MD		 1000 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1001 consumer_data->cmd_sock =
1002 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1003 if (consumer_data->cmd_sock < 0) {
1004 sem_post(&consumer_data->sem);
48842b30 1005 PERROR("consumer connect");
1d4b027a
DG		 1006 goto error;
1007 }
1008 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 1009 sem_post(&consumer_data->sem);
1010 DBG("consumer command socket ready");
1d4b027a 1011 } else {
3bd1e081 1012 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 1013 lttcomm_get_readable_code(-code));
1014 goto error;
1015 }
1016
54d01ffb 1017 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1018 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1019 if (ret < 0) {
72079cae
DG		 1020 goto error;
1021 }
1022
5eb91c98
DG		 1023 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1024 if (ret < 0) {
72079cae 1025 goto error;
5eb91c98
DG		 1026 }
1027
1028 /* Update number of fd */
1029 nb_fd = LTTNG_POLL_GETNB(&events);
1030
1031 /* Inifinite blocking call, waiting for transmission */
1032 ret = lttng_poll_wait(&events, -1);
1033 if (ret < 0) {
72079cae
DG		 1034 goto error;
1035 }
1036
5eb91c98
DG		 1037 for (i = 0; i < nb_fd; i++) {
1038 /* Fetch once the poll data */
1039 revents = LTTNG_POLL_GETEV(&events, i);
1040 pollfd = LTTNG_POLL_GETFD(&events, i);
1041
1042 /* Thread quit pipe has been closed. Killing thread. */
1043 ret = check_thread_quit_pipe(pollfd, revents);
1044 if (ret) {
1045 goto error;
1046 }
1047
1048 /* Event on the kconsumerd socket */
1049 if (pollfd == sock) {
1050 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1051 ERR("consumer err socket second poll error");
5eb91c98
DG		 1052 goto error;
1053 }
1054 }
1055 }
1056
712ea556 1057 /* Wait for any kconsumerd error */
54d01ffb
DG		 1058 ret = lttcomm_recv_unix_sock(sock, &code,
1059 sizeof(enum lttcomm_return_code));
712ea556 1060 if (ret <= 0) {
3bd1e081 1061 ERR("consumer closed the command socket");
712ea556 1062 goto error;
6f61d021 1063 }
1d4b027a 1064
3bd1e081 1065 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1066
1d4b027a 1067error:
3bd1e081
MD		 1068 DBG("consumer thread dying");
1069 close(consumer_data->err_sock);
1070 close(consumer_data->cmd_sock);
5eb91c98 1071 close(sock);
273ea72c 1072
3bd1e081
MD		 1073 unlink(consumer_data->err_unix_sock_path);
1074 unlink(consumer_data->cmd_unix_sock_path);
1075 consumer_data->pid = 0;
1d4b027a 1076
5eb91c98 1077 lttng_poll_clean(&events);
0177d773 1078
5eb91c98 1079 return NULL;
099e26bd
DG		 1080}
1081
099e26bd
DG		 1082/*
1083 * This thread manage application communication.
1d4b027a
DG		 1084 */
1085static void *thread_manage_apps(void *data)
099e26bd 1086{
5eb91c98
DG		 1087 int i, ret, pollfd;
1088 uint32_t revents, nb_fd;
099e26bd 1089 struct ust_command ust_cmd;
5eb91c98 1090 struct lttng_poll_event events;
099e26bd
DG		 1091
1092 DBG("[thread] Manage application started");
1093
f6a9efaa
DG		 1094 rcu_register_thread();
1095 rcu_thread_online();
1096
5eb91c98
DG		 1097 ret = create_thread_poll_set(&events, 2);
1098 if (ret < 0) {
1099 goto error;
1100 }
099e26bd 1101
5eb91c98
DG		 1102 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1103 if (ret < 0) {
1104 goto error;
1105 }
099e26bd 1106
5eb91c98
DG		 1107 while (1) {
1108 /* Zeroed the events structure */
1109 lttng_poll_reset(&events);
0177d773 1110
5eb91c98 1111 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1112
1113 DBG("Apps thread polling on %d fds", nb_fd);
1114
1115 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1116 ret = lttng_poll_wait(&events, -1);
099e26bd 1117 if (ret < 0) {
099e26bd
DG		 1118 goto error;
1119 }
1120
5eb91c98
DG		 1121 for (i = 0; i < nb_fd; i++) {
1122 /* Fetch once the poll data */
1123 revents = LTTNG_POLL_GETEV(&events, i);
1124 pollfd = LTTNG_POLL_GETFD(&events, i);
1125
1126 /* Thread quit pipe has been closed. Killing thread. */
1127 ret = check_thread_quit_pipe(pollfd, revents);
1128 if (ret) {
099e26bd 1129 goto error;
5eb91c98 1130 }
099e26bd 1131
5eb91c98
DG		 1132 /* Inspect the apps cmd pipe */
1133 if (pollfd == apps_cmd_pipe[0]) {
1134 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1135 ERR("Apps command pipe error");
0177d773 1136 goto error;
5eb91c98
DG		 1137 } else if (revents & LPOLLIN) {
1138 /* Empty pipe */
1139 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1140 if (ret < 0 || ret < sizeof(ust_cmd)) {
1141 perror("read apps cmd pipe");
1142 goto error;
1143 }
099e26bd 1144
5eb91c98 1145 /* Register applicaton to the session daemon */
56fff090 1146 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1147 ust_cmd.sock);
88ff5b7f 1148 if (ret == -ENOMEM) {
5eb91c98 1149 goto error;
88ff5b7f
MD		 1150 } else if (ret < 0) {
1151 break;
5eb91c98
DG		 1152 }
1153
acc7b41b
MD		 1154 /*
1155 * Add channel(s) and event(s) to newly registered apps
1156 * from lttng global UST domain.
1157 */
1158 update_ust_app(ust_cmd.sock);
1159
f2ca2e25 1160 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG		 1161 if (ret < 0) {
1162 /*
1163 * If the registration is not possible, we simply
1164 * unregister the apps and continue
1165 */
56fff090 1166 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1167 } else {
1168 /*
1169 * We just need here to monitor the close of the UST
1170 * socket and poll set monitor those by default.
1171 */
1172 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1173 if (ret < 0) {
1174 goto error;
1175 }
1176
54d01ffb
DG		 1177 DBG("Apps with sock %d added to poll set",
1178 ust_cmd.sock);
5eb91c98 1179 }
487cf67c 1180
5eb91c98 1181 break;
0177d773 1182 }
5eb91c98
DG		 1183 } else {
1184 /*
54d01ffb
DG		 1185 * At this point, we know that a registered application made
1186 * the event at poll_wait.
5eb91c98
DG		 1187 */
1188 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1189 /* Removing from the poll set */
1190 ret = lttng_poll_del(&events, pollfd);
1191 if (ret < 0) {
1192 goto error;
1193 }
099e26bd 1194
b9d9b220 1195 /* Socket closed on remote end. */
56fff090 1196 ust_app_unregister(pollfd);
5eb91c98
DG		 1197 break;
1198 }
099e26bd
DG		 1199 }
1200 }
099e26bd
DG		 1201 }
1202
1203error:
1204 DBG("Application communication apps dying");
1205 close(apps_cmd_pipe[0]);
1206 close(apps_cmd_pipe[1]);
1207
5eb91c98 1208 lttng_poll_clean(&events);
099e26bd 1209
f6a9efaa
DG		 1210 rcu_thread_offline();
1211 rcu_unregister_thread();
099e26bd
DG		 1212 return NULL;
1213}
1214
1215/*
1216 * Dispatch request from the registration threads to the application
1217 * communication thread.
1218 */
1219static void *thread_dispatch_ust_registration(void *data)
1220{
1221 int ret;
1222 struct cds_wfq_node *node;
1223 struct ust_command *ust_cmd = NULL;
1224
1225 DBG("[thread] Dispatch UST command started");
1226
1227 while (!dispatch_thread_exit) {
1228 /* Atomically prepare the queue futex */
1229 futex_nto1_prepare(&ust_cmd_queue.futex);
1230
1231 do {
1232 /* Dequeue command for registration */
1233 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1234 if (node == NULL) {
00a17c97 1235 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1236 /* Continue thread execution */
1237 break;
1238 }
1239
1240 ust_cmd = caa_container_of(node, struct ust_command, node);
1241
2f50c8a3
DG		 1242 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1243 " gid:%d sock:%d name:%s (version %d.%d)",
1244 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1245 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1246 ust_cmd->sock, ust_cmd->reg_msg.name,
1247 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1248 /*
1249 * Inform apps thread of the new application registration. This
1250 * call is blocking so we can be assured that the data will be read
1251 * at some point in time or wait to the end of the world :)
1252 */
1253 ret = write(apps_cmd_pipe[1], ust_cmd,
1254 sizeof(struct ust_command));
1255 if (ret < 0) {
1256 perror("write apps cmd pipe");
1257 if (errno == EBADF) {
1258 /*
1259 * We can't inform the application thread to process
1260 * registration. We will exit or else application
1261 * registration will not occur and tracing will never
1262 * start.
1263 */
1264 goto error;
1265 }
1266 }
1267 free(ust_cmd);
1268 } while (node != NULL);
1269
1270 /* Futex wait on queue. Blocking call on futex() */
1271 futex_nto1_wait(&ust_cmd_queue.futex);
1272 }
1273
1274error:
1275 DBG("Dispatch thread dying");
1276 return NULL;
1277}
1278
1279/*
1280 * This thread manage application registration.
1281 */
1282static void *thread_registration_apps(void *data)
1d4b027a 1283{
5eb91c98
DG		 1284 int sock = 0, i, ret, pollfd;
1285 uint32_t revents, nb_fd;
1286 struct lttng_poll_event events;
099e26bd
DG		 1287 /*
1288 * Get allocated in this thread, enqueued to a global queue, dequeued and
1289 * freed in the manage apps thread.
1290 */
1291 struct ust_command *ust_cmd = NULL;
1d4b027a 1292
099e26bd 1293 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1294
1295 ret = lttcomm_listen_unix_sock(apps_sock);
1296 if (ret < 0) {
1297 goto error;
1298 }
1299
5eb91c98
DG		 1300 /*
1301 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1302 * more will be added to this poll set.
1303 */
1304 ret = create_thread_poll_set(&events, 2);
1305 if (ret < 0) {
1306 goto error;
1307 }
273ea72c 1308
5eb91c98
DG		 1309 /* Add the application registration socket */
1310 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1311 if (ret < 0) {
1312 goto error;
1313 }
273ea72c 1314
1d4b027a 1315 /* Notify all applications to register */
0fdd1e2c
DG		 1316 ret = notify_ust_apps(1);
1317 if (ret < 0) {
1318 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1319 "Execution continues but there might be problem for already\n"
1320 "running applications that wishes to register.");
0fdd1e2c 1321 }
1d4b027a
DG		 1322
1323 while (1) {
1324 DBG("Accepting application registration");
273ea72c 1325
5eb91c98
DG		 1326 nb_fd = LTTNG_POLL_GETNB(&events);
1327
273ea72c 1328 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1329 ret = lttng_poll_wait(&events, -1);
273ea72c 1330 if (ret < 0) {
273ea72c
DG		 1331 goto error;
1332 }
1333
5eb91c98
DG		 1334 for (i = 0; i < nb_fd; i++) {
1335 /* Fetch once the poll data */
1336 revents = LTTNG_POLL_GETEV(&events, i);
1337 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1338
5eb91c98
DG		 1339 /* Thread quit pipe has been closed. Killing thread. */
1340 ret = check_thread_quit_pipe(pollfd, revents);
1341 if (ret) {
90014c57
DG		 1342 goto error;
1343 }
1d4b027a 1344
5eb91c98
DG		 1345 /* Event on the registration socket */
1346 if (pollfd == apps_sock) {
1347 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1348 ERR("Register apps socket poll error");
1349 goto error;
1350 } else if (revents & LPOLLIN) {
1351 sock = lttcomm_accept_unix_sock(apps_sock);
1352 if (sock < 0) {
1353 goto error;
1354 }
099e26bd 1355
5eb91c98 1356 /* Create UST registration command for enqueuing */
ba7f0ae5 1357 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1358 if (ust_cmd == NULL) {
ba7f0ae5 1359 perror("ust command zmalloc");
5eb91c98
DG		 1360 goto error;
1361 }
1d4b027a 1362
5eb91c98
DG		 1363 /*
1364 * Using message-based transmissions to ensure we don't
1365 * have to deal with partially received messages.
1366 */
1367 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1368 sizeof(struct ust_register_msg));
1369 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1370 if (ret < 0) {
1371 perror("lttcomm_recv_unix_sock register apps");
1372 } else {
1373 ERR("Wrong size received on apps register");
1374 }
1375 free(ust_cmd);
1376 close(sock);
1377 continue;
1378 }
099e26bd 1379
5eb91c98 1380 ust_cmd->sock = sock;
099e26bd 1381
5eb91c98
DG		 1382 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1383 " gid:%d sock:%d name:%s (version %d.%d)",
1384 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1385 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1386 ust_cmd->sock, ust_cmd->reg_msg.name,
1387 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1388
5eb91c98
DG		 1389 /*
1390 * Lock free enqueue the registration request. The red pill
54d01ffb 1391 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1392 */
1393 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1394
1395 /*
1396 * Wake the registration queue futex. Implicit memory
1397 * barrier with the exchange in cds_wfq_enqueue.
1398 */
1399 futex_nto1_wake(&ust_cmd_queue.futex);
1400 }
1401 }
90014c57 1402 }
1d4b027a
DG		 1403 }
1404
1405error:
0fdd1e2c
DG		 1406 DBG("UST Registration thread dying");
1407
1408 /* Notify that the registration thread is gone */
1409 notify_ust_apps(0);
1410
1411 close(apps_sock);
1412 close(sock);
273ea72c 1413 unlink(apps_unix_sock_path);
0fdd1e2c 1414
5eb91c98
DG		 1415 lttng_poll_clean(&events);
1416
1d4b027a
DG		 1417 return NULL;
1418}
1419
8c0faa1d 1420/*
3bd1e081 1421 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1422 * exec or it will fails.
8c0faa1d 1423 */
3bd1e081 1424static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1425{
1426 int ret;
ee0b0061
DG		 1427 struct timespec timeout;
1428
1429 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1430 timeout.tv_nsec = 0;
8c0faa1d
DG		 1431
1432 /* Setup semaphore */
3bd1e081 1433 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1434 if (ret < 0) {
3bd1e081 1435 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1436 goto error;
1437 }
8c0faa1d 1438
3bd1e081
MD		 1439 ret = pthread_create(&consumer_data->thread, NULL,
1440 thread_manage_consumer, consumer_data);
8c0faa1d 1441 if (ret != 0) {
3bd1e081 1442 PERROR("pthread_create consumer");
ee0b0061 1443 ret = -1;
8c0faa1d
DG		 1444 goto error;
1445 }
1446
ee0b0061
DG		 1447 /* Get time for sem_timedwait absolute timeout */
1448 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1449 if (ret < 0) {
3bd1e081 1450 PERROR("clock_gettime spawn consumer");
ee0b0061 1451 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1452 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1453 } else {
1454 /* Normal timeout if the gettime was successful */
1455 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1456 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1457 }
8c0faa1d 1458
ee0b0061
DG		 1459 if (ret < 0) {
1460 if (errno == ETIMEDOUT) {
1461 /*
1462 * Call has timed out so we kill the kconsumerd_thread and return
1463 * an error.
1464 */
3bd1e081
MD		 1465 ERR("The consumer thread was never ready. Killing it");
1466 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1467 if (ret < 0) {
3bd1e081 1468 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1469 }
1470 } else {
3bd1e081 1471 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1472 }
1473 goto error;
1474 }
1475
3bd1e081
MD		 1476 pthread_mutex_lock(&consumer_data->pid_mutex);
1477 if (consumer_data->pid == 0) {
712ea556 1478 ERR("Kconsumerd did not start");
3bd1e081 1479 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1480 goto error;
1481 }
3bd1e081 1482 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1483
8c0faa1d
DG		 1484 return 0;
1485
1486error:
1487 return ret;
1488}
1489
d9800920 1490/*
3bd1e081 1491 * Join consumer thread
d9800920 1492 */
3bd1e081 1493static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1494{
1495 void *status;
1496 int ret;
1497
3bd1e081
MD		 1498 if (consumer_data->pid != 0) {
1499 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1500 if (ret) {
3bd1e081 1501 ERR("Error killing consumer daemon");
cf3af59e
MD		 1502 return ret;
1503 }
3bd1e081 1504 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1505 } else {
1506 return 0;
1507 }
1508}
1509
8c0faa1d 1510/*
3bd1e081 1511 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1512 *
d063d709 1513 * Return pid if successful else -1.
8c0faa1d 1514 */
3bd1e081 1515static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1516{
1517 int ret;
1518 pid_t pid;
94c55f17 1519 const char *consumer_to_use;
53086306 1520 const char *verbosity;
94c55f17 1521 struct stat st;
8c0faa1d 1522
3bd1e081 1523 DBG("Spawning consumerd");
c49dc785 1524
8c0faa1d
DG		 1525 pid = fork();
1526 if (pid == 0) {
1527 /*
3bd1e081 1528 * Exec consumerd.
8c0faa1d 1529 */
daee5345 1530 if (opt_verbose_consumer) {
53086306
DG		 1531 verbosity = "--verbose";
1532 } else {
1533 verbosity = "--quiet";
1534 }
3bd1e081
MD		 1535 switch (consumer_data->type) {
1536 case LTTNG_CONSUMER_KERNEL:
94c55f17 1537 /*
f806231f
MD		 1538 * Find out which consumerd to execute. We will
1539 * first try the 64-bit path, then the
1540 * sessiond's installation directory, and
1541 * fallback on the 32-bit one,
94c55f17 1542 */
63a799e8
AM		 1543 DBG3("Looking for a kernel consumer at these locations:");
1544 DBG3(" 1) %s", consumerd64_bin);
1545 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1546 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1547 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1548 DBG3("Found location #1");
94c55f17 1549 consumer_to_use = consumerd64_bin;
94c55f17 1550 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1551 DBG3("Found location #2");
94c55f17 1552 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1553 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1554 DBG3("Found location #3");
eb1e0bd4 1555 consumer_to_use = consumerd32_bin;
94c55f17 1556 } else {
63a799e8 1557 DBG("Could not find any valid consumerd executable");
94c55f17
AM		 1558 break;
1559 }
1560 DBG("Using kernel consumer at: %s", consumer_to_use);
1561 execl(consumer_to_use,
1562 "lttng-consumerd", verbosity, "-k",
1563 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1564 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1565 NULL);
3bd1e081 1566 break;
7753dea8
MD		 1567 case LTTNG_CONSUMER64_UST:
1568 {
b1e0b6b6 1569 char *tmpnew = NULL;
8f4905da
MD		 1570
1571 if (consumerd64_libdir[0] != '\0') {
1572 char *tmp;
1573 size_t tmplen;
1574
1575 tmp = getenv("LD_LIBRARY_PATH");
1576 if (!tmp) {
1577 tmp = "";
1578 }
1579 tmplen = strlen("LD_LIBRARY_PATH=")
1580 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1581 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1582 if (!tmpnew) {
1583 ret = -ENOMEM;
1584 goto error;
1585 }
1586 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1587 strcat(tmpnew, consumerd64_libdir);
1588 if (tmp[0] != '\0') {
1589 strcat(tmpnew, ":");
1590 strcat(tmpnew, tmp);
1591 }
1592 ret = putenv(tmpnew);
1593 if (ret) {
1594 ret = -errno;
1595 goto error;
1596 }
1597 }
94c55f17 1598 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1599 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1600 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1601 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1602 NULL);
8f4905da
MD		 1603 if (consumerd64_libdir[0] != '\0') {
1604 free(tmpnew);
1605 }
1606 if (ret) {
1607 goto error;
1608 }
3bd1e081 1609 break;
7753dea8
MD		 1610 }
1611 case LTTNG_CONSUMER32_UST:
1612 {
937dde8e 1613 char *tmpnew = NULL;
8f4905da
MD		 1614
1615 if (consumerd32_libdir[0] != '\0') {
1616 char *tmp;
1617 size_t tmplen;
1618
1619 tmp = getenv("LD_LIBRARY_PATH");
1620 if (!tmp) {
1621 tmp = "";
1622 }
1623 tmplen = strlen("LD_LIBRARY_PATH=")
1624 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1625 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1626 if (!tmpnew) {
1627 ret = -ENOMEM;
1628 goto error;
1629 }
1630 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1631 strcat(tmpnew, consumerd32_libdir);
1632 if (tmp[0] != '\0') {
1633 strcat(tmpnew, ":");
1634 strcat(tmpnew, tmp);
1635 }
1636 ret = putenv(tmpnew);
1637 if (ret) {
1638 ret = -errno;
1639 goto error;
1640 }
1641 }
94c55f17 1642 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1643 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1644 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1645 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1646 NULL);
8f4905da
MD		 1647 if (consumerd32_libdir[0] != '\0') {
1648 free(tmpnew);
1649 }
1650 if (ret) {
1651 goto error;
1652 }
7753dea8
MD		 1653 break;
1654 }
3bd1e081
MD		 1655 default:
1656 perror("unknown consumer type");
1657 exit(EXIT_FAILURE);
1658 }
8c0faa1d
DG		 1659 if (errno != 0) {
1660 perror("kernel start consumer exec");
1661 }
1662 exit(EXIT_FAILURE);
1663 } else if (pid > 0) {
1664 ret = pid;
8c0faa1d 1665 } else {
3bd1e081 1666 perror("start consumer fork");
8c0faa1d 1667 ret = -errno;
8c0faa1d 1668 }
8f4905da 1669error:
8c0faa1d
DG		 1670 return ret;
1671}
1672
693bd40b 1673/*
3bd1e081 1674 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1675 */
3bd1e081 1676static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1677{
1678 int ret;
1679
3bd1e081
MD		 1680 pthread_mutex_lock(&consumer_data->pid_mutex);
1681 if (consumer_data->pid != 0) {
1682 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1683 goto end;
1684 }
693bd40b 1685
3bd1e081 1686 ret = spawn_consumerd(consumer_data);
c49dc785 1687 if (ret < 0) {
3bd1e081
MD		 1688 ERR("Spawning consumerd failed");
1689 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1690 goto error;
693bd40b 1691 }
c49dc785 1692
3bd1e081
MD		 1693 /* Setting up the consumer_data pid */
1694 consumer_data->pid = ret;
48842b30 1695 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1696 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1697
3bd1e081
MD		 1698 DBG2("Spawning consumer control thread");
1699 ret = spawn_consumer_thread(consumer_data);
693bd40b 1700 if (ret < 0) {
3bd1e081 1701 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1702 goto error;
1703 }
1704
c49dc785 1705end:
693bd40b
DG		 1706 return 0;
1707
1708error:
1709 return ret;
1710}
1711
b73401da 1712/*
d063d709 1713 * modprobe_kernel_modules
b73401da
DG		 1714 */
1715static int modprobe_kernel_modules(void)
1716{
ab147185 1717 int ret = 0, i;
b73401da
DG		 1718 char modprobe[256];
1719
ab147185
MD		 1720 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1721 ret = snprintf(modprobe, sizeof(modprobe),
1722 "/sbin/modprobe %s%s",
24b487b8 1723 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1724 kernel_modules_list[i].name);
b73401da
DG		 1725 if (ret < 0) {
1726 perror("snprintf modprobe");
1727 goto error;
1728 }
ab147185 1729 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1730 ret = system(modprobe);
ab147185
MD		 1731 if (ret == -1) {
1732 ERR("Unable to launch modprobe for module %s",
1733 kernel_modules_list[i].name);
1734 } else if (kernel_modules_list[i].required
d9800920 1735 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1736 ERR("Unable to load module %s",
1737 kernel_modules_list[i].name);
1738 } else {
1739 DBG("Modprobe successfully %s",
1740 kernel_modules_list[i].name);
1741 }
1742 }
1743
1744error:
1745 return ret;
1746}
1747
b73401da 1748/*
d063d709 1749 * mount_debugfs
b73401da
DG		 1750 */
1751static int mount_debugfs(char *path)
1752{
1753 int ret;
1754 char *type = "debugfs";
1755
67f747d8 1756 ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1757 if (ret < 0) {
7272acf5 1758 PERROR("Cannot create debugfs path");
b73401da
DG		 1759 goto error;
1760 }
1761
1762 ret = mount(type, path, type, 0, NULL);
1763 if (ret < 0) {
7272acf5 1764 PERROR("Cannot mount debugfs");
b73401da
DG		 1765 goto error;
1766 }
1767
1768 DBG("Mounted debugfs successfully at %s", path);
1769
1770error:
1771 return ret;
1772}
1773
8c0faa1d 1774/*
d063d709 1775 * Setup necessary data for kernel tracer action.
8c0faa1d 1776 */
f3ed775e 1777static void init_kernel_tracer(void)
8c0faa1d 1778{
b73401da
DG		 1779 int ret;
1780 char *proc_mounts = "/proc/mounts";
1781 char line[256];
684d34d2 1782 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1783 FILE *fp;
1784
1785 /* Detect debugfs */
1786 fp = fopen(proc_mounts, "r");
1787 if (fp == NULL) {
1788 ERR("Unable to probe %s", proc_mounts);
1789 goto error;
1790 }
1791
1792 while (fgets(line, sizeof(line), fp) != NULL) {
1793 if (strstr(line, "debugfs") != NULL) {
1794 /* Remove first string */
1795 strtok(line, " ");
1796 /* Dup string here so we can reuse line later on */
1797 debugfs_path = strdup(strtok(NULL, " "));
1798 DBG("Got debugfs path : %s", debugfs_path);
1799 break;
1800 }
1801 }
1802
1803 fclose(fp);
1804
1805 /* Mount debugfs if needded */
1806 if (debugfs_path == NULL) {
1807 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1808 if (ret < 0) {
1809 perror("asprintf debugfs path");
1810 goto error;
1811 }
1812 ret = mount_debugfs(debugfs_path);
1813 if (ret < 0) {
7272acf5 1814 perror("Cannot mount debugfs");
b73401da
DG		 1815 goto error;
1816 }
1817 }
1818
1819 /* Modprobe lttng kernel modules */
1820 ret = modprobe_kernel_modules();
1821 if (ret < 0) {
1822 goto error;
1823 }
1824
1825 /* Setup lttng kernel path */
1826 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1827 if (ret < 0) {
1828 perror("asprintf lttng path");
1829 goto error;
1830 }
1831
1832 /* Open debugfs lttng */
1833 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1834 if (kernel_tracer_fd < 0) {
b73401da
DG		 1835 DBG("Failed to open %s", lttng_path);
1836 goto error;
8c0faa1d
DG		 1837 }
1838
b73401da
DG		 1839 free(lttng_path);
1840 free(debugfs_path);
f3ed775e 1841 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1842 return;
1843
1844error:
1845 if (lttng_path) {
1846 free(lttng_path);
1847 }
1848 if (debugfs_path) {
1849 free(debugfs_path);
1850 }
1851 WARN("No kernel tracer available");
1852 kernel_tracer_fd = 0;
1853 return;
f3ed775e 1854}
33a2b854 1855
f3ed775e 1856/*
54d01ffb 1857 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1858 */
54d01ffb 1859static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1860{
f40799e8 1861 int ret = 0;
8c0faa1d 1862
3bd1e081 1863 if (session->consumer_fds_sent == 0) {
d9800920 1864 /*
54d01ffb
DG		 1865 * Assign default kernel consumer socket if no consumer assigned to the
1866 * kernel session. At this point, it's NOT suppose to be 0 but this is
1867 * an extra security check.
d9800920
DG		 1868 */
1869 if (session->consumer_fd == 0) {
3bd1e081 1870 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1871 }
1872
2bdd86d4 1873 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1874 if (ret < 0) {
f3ed775e
DG		 1875 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1876 goto error;
1877 }
1d4b027a 1878
3bd1e081 1879 session->consumer_fds_sent = 1;
f3ed775e 1880 }
1d4b027a
DG		 1881
1882error:
1883 return ret;
8c0faa1d
DG		 1884}
1885
0177d773
DG		 1886/*
1887 * Create an UST session and add it to the session ust list.
1888 */
44d3bd01 1889static int create_ust_session(struct ltt_session *session,
6df2e2c9 1890 struct lttng_domain *domain)
0177d773 1891{
13384287 1892 struct ltt_ust_session *lus = NULL;
6df2e2c9 1893 int ret;
44d3bd01
DG		 1894
1895 switch (domain->type) {
48842b30 1896 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1897 break;
1898 default:
13384287 1899 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1900 goto error;
1901 }
0177d773
DG		 1902
1903 DBG("Creating UST session");
1904
a991f516 1905 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1906 if (lus == NULL) {
44d3bd01 1907 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1908 goto error;
1909 }
1910
67f747d8 1911 ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1912 session->uid, session->gid);
0177d773
DG		 1913 if (ret < 0) {
1914 if (ret != -EEXIST) {
1915 ERR("Trace directory creation error");
44d3bd01 1916 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1917 goto error;
1918 }
1919 }
1920
f6a9efaa
DG		 1921 /* The domain type dictate different actions on session creation */
1922 switch (domain->type) {
48842b30
DG		 1923 case LTTNG_DOMAIN_UST:
1924 /* No ustctl for the global UST domain */
1925 break;
1926 default:
36dc12cc 1927 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1928 goto error;
0177d773 1929 }
6df2e2c9
MD		 1930 lus->uid = session->uid;
1931 lus->gid = session->gid;
f6a9efaa 1932 session->ust_session = lus;
44d3bd01
DG		 1933
1934 return LTTCOMM_OK;
0177d773
DG		 1935
1936error:
1937 free(lus);
1938 return ret;
1939}
1940
333f285e 1941/*
d063d709 1942 * Create a kernel tracer session then create the default channel.
333f285e 1943 */
6df2e2c9 1944static int create_kernel_session(struct ltt_session *session)
333f285e 1945{
f3ed775e 1946 int ret;
f3ed775e
DG		 1947
1948 DBG("Creating kernel session");
1949
1950 ret = kernel_create_session(session, kernel_tracer_fd);
1951 if (ret < 0) {
1952 ret = LTTCOMM_KERN_SESS_FAIL;
1953 goto error;
333f285e
DG		 1954 }
1955
d9800920 1956 /* Set kernel consumer socket fd */
3bd1e081
MD		 1957 if (kconsumer_data.cmd_sock) {
1958 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1959 }
1960
67f747d8 1961 ret = mkdir_recursive_run_as(session->kernel_session->trace_path,
6df2e2c9 1962 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1963 if (ret < 0) {
996b65c8 1964 if (ret != -EEXIST) {
7a485870
DG		 1965 ERR("Trace directory creation error");
1966 goto error;
1967 }
1968 }
6df2e2c9
MD		 1969 session->kernel_session->uid = session->uid;
1970 session->kernel_session->gid = session->gid;
7a485870 1971
f3ed775e
DG		 1972error:
1973 return ret;
333f285e
DG		 1974}
1975
8e0af1b4
MD		 1976/*
1977 * Check if the UID or GID match the session. Root user has access to
1978 * all sessions.
1979 */
1980static int session_access_ok(struct ltt_session *session,
1981 uid_t uid, gid_t gid)
1982{
1983 if (uid != session->uid && gid != session->gid
1984 && uid != 0) {
1985 return 0;
1986 } else {
1987 return 1;
1988 }
1989}
1990
1991static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1992{
1993 unsigned int i = 0;
1994 struct ltt_session *session;
1995
1996 DBG("Counting number of available session for UID %d GID %d",
1997 uid, gid);
1998 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1999 /*
2000 * Only list the sessions the user can control.
2001 */
2002 if (!session_access_ok(session, uid, gid)) {
2003 continue;
2004 }
2005 i++;
2006 }
2007 return i;
2008}
2009
6c9cc2ab
DG		 2010/*
2011 * Using the session list, filled a lttng_session array to send back to the
2012 * client for session listing.
2013 *
2014 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 2015 * session_lock_list() and session_unlock_list().
6c9cc2ab 2016 */
8e0af1b4
MD		 2017static void list_lttng_sessions(struct lttng_session *sessions,
2018 uid_t uid, gid_t gid)
6c9cc2ab 2019{
8e0af1b4 2020 unsigned int i = 0;
6c9cc2ab
DG		 2021 struct ltt_session *session;
2022
8e0af1b4
MD		 2023 DBG("Getting all available session for UID %d GID %d",
2024 uid, gid);
6c9cc2ab
DG		 2025 /*
2026 * Iterate over session list and append data after the control struct in
2027 * the buffer.
2028 */
2029 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD		 2030 /*
2031 * Only list the sessions the user can control.
2032 */
2033 if (!session_access_ok(session, uid, gid)) {
2034 continue;
2035 }
6c9cc2ab 2036 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 2037 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 2038 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 2039 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 2040 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 2041 i++;
2042 }
2043}
2044
9f19cc17
DG		 2045/*
2046 * Fill lttng_channel array of all channels.
2047 */
b551a063 2048static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 2049 struct lttng_channel *channels)
2050{
2051 int i = 0;
2052 struct ltt_kernel_channel *kchan;
2053
2054 DBG("Listing channels for session %s", session->name);
2055
b551a063
DG		 2056 switch (domain) {
2057 case LTTNG_DOMAIN_KERNEL:
2058 /* Kernel channels */
2059 if (session->kernel_session != NULL) {
2060 cds_list_for_each_entry(kchan,
2061 &session->kernel_session->channel_list.head, list) {
2062 /* Copy lttng_channel struct to array */
2063 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2064 channels[i].enabled = kchan->enabled;
2065 i++;
2066 }
2067 }
2068 break;
2069 case LTTNG_DOMAIN_UST:
2070 {
bec39940 2071 struct lttng_ht_iter iter;
b551a063
DG		 2072 struct ltt_ust_channel *uchan;
2073
bec39940
DG		 2074 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2075 &iter.iter, uchan, node.node) {
b551a063
DG		 2076 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2077 channels[i].attr.overwrite = uchan->attr.overwrite;
2078 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2079 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2080 channels[i].attr.switch_timer_interval =
2081 uchan->attr.switch_timer_interval;
2082 channels[i].attr.read_timer_interval =
2083 uchan->attr.read_timer_interval;
aea829b3 2084 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2085 switch (uchan->attr.output) {
2086 case LTTNG_UST_MMAP:
2087 default:
2088 channels[i].attr.output = LTTNG_EVENT_MMAP;
2089 break;
2090 }
befe0905 2091 i++;
b551a063
DG		 2092 }
2093 break;
2094 }
2095 default:
2096 break;
2097 }
2098}
2099
2100/*
2101 * Create a list of ust global domain events.
2102 */
2103static int list_lttng_ust_global_events(char *channel_name,
2104 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2105{
2106 int i = 0, ret = 0;
2107 unsigned int nb_event = 0;
bec39940
DG		 2108 struct lttng_ht_iter iter;
2109 struct lttng_ht_node_str *node;
b551a063
DG		 2110 struct ltt_ust_channel *uchan;
2111 struct ltt_ust_event *uevent;
2112 struct lttng_event *tmp;
2113
2114 DBG("Listing UST global events for channel %s", channel_name);
2115
2116 rcu_read_lock();
2117
bec39940
DG		 2118 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2119 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG		 2120 if (node == NULL) {
2121 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2122 goto error;
b551a063
DG		 2123 }
2124
bec39940 2125 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2126
bec39940 2127 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2128
b551a063
DG		 2129 if (nb_event == 0) {
2130 ret = nb_event;
2131 goto error;
2132 }
2133
2134 DBG3("Listing UST global %d events", nb_event);
2135
2136 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2137 if (tmp == NULL) {
2138 ret = -LTTCOMM_FATAL;
2139 goto error;
2140 }
2141
bec39940 2142 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG		 2143 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2144 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2145 tmp[i].enabled = uevent->enabled;
2146 switch (uevent->attr.instrumentation) {
2147 case LTTNG_UST_TRACEPOINT:
2148 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2149 break;
2150 case LTTNG_UST_PROBE:
2151 tmp[i].type = LTTNG_EVENT_PROBE;
2152 break;
2153 case LTTNG_UST_FUNCTION:
2154 tmp[i].type = LTTNG_EVENT_FUNCTION;
2155 break;
ac3bd9c0 2156 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2157 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2158 break;
9f19cc17 2159 }
d7b75b30 2160 i++;
9f19cc17
DG		 2161 }
2162
b551a063
DG		 2163 ret = nb_event;
2164 *events = tmp;
2165
2166error:
2167 rcu_read_unlock();
2168 return ret;
9f19cc17
DG		 2169}
2170
2171/*
b551a063 2172 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2173 */
b551a063
DG		 2174static int list_lttng_kernel_events(char *channel_name,
2175 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2176{
b551a063
DG		 2177 int i = 0, ret;
2178 unsigned int nb_event;
9f19cc17 2179 struct ltt_kernel_event *event;
b551a063
DG		 2180 struct ltt_kernel_channel *kchan;
2181
2182 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2183 if (kchan == NULL) {
2184 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2185 goto error;
2186 }
2187
2188 nb_event = kchan->event_count;
9f19cc17
DG		 2189
2190 DBG("Listing events for channel %s", kchan->channel->name);
2191
b551a063
DG		 2192 if (nb_event == 0) {
2193 ret = nb_event;
2194 goto error;
2195 }
2196
2197 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2198 if (*events == NULL) {
2199 ret = LTTCOMM_FATAL;
2200 goto error;
2201 }
2202
9f19cc17
DG		 2203 /* Kernel channels */
2204 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2205 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2206 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2207 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2208 switch (event->event->instrumentation) {
2209 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2210 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2211 break;
2212 case LTTNG_KERNEL_KPROBE:
2213 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2214 (*events)[i].type = LTTNG_EVENT_PROBE;
2215 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2216 sizeof(struct lttng_kernel_kprobe));
2217 break;
2218 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2219 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2220 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2221 sizeof(struct lttng_kernel_function));
2222 break;
0133c199 2223 case LTTNG_KERNEL_NOOP:
b551a063 2224 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2225 break;
a54bd42d 2226 case LTTNG_KERNEL_SYSCALL:
b551a063 2227 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2228 break;
7a3d1328
MD		 2229 case LTTNG_KERNEL_ALL:
2230 assert(0);
2231 break;
9f19cc17
DG		 2232 }
2233 i++;
2234 }
b551a063
DG		 2235
2236 return nb_event;
2237
2238error:
2239 return ret;
9f19cc17
DG		 2240}
2241
fac6795d 2242/*
54d01ffb 2243 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2244 */
54d01ffb
DG		 2245static int cmd_disable_channel(struct ltt_session *session,
2246 int domain, char *channel_name)
fac6795d 2247{
54d01ffb 2248 int ret;
78f0bacd
DG		 2249 struct ltt_ust_session *usess;
2250
2251 usess = session->ust_session;
379473d2 2252
54d01ffb 2253 switch (domain) {
78f0bacd
DG		 2254 case LTTNG_DOMAIN_KERNEL:
2255 {
2256 ret = channel_kernel_disable(session->kernel_session,
2257 channel_name);
2258 if (ret != LTTCOMM_OK) {
2259 goto error;
2260 }
54d01ffb 2261
78f0bacd
DG		 2262 kernel_wait_quiescent(kernel_tracer_fd);
2263 break;
2264 }
2265 case LTTNG_DOMAIN_UST:
2266 {
2267 struct ltt_ust_channel *uchan;
bec39940 2268 struct lttng_ht *chan_ht;
78f0bacd 2269
7885e399
DG		 2270 chan_ht = usess->domain_global.channels;
2271
2272 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2273 if (uchan == NULL) {
2274 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2275 goto error;
78f0bacd
DG		 2276 }
2277
7885e399
DG		 2278 ret = channel_ust_disable(usess, domain, uchan);
2279 if (ret != LTTCOMM_OK) {
78f0bacd
DG		 2280 goto error;
2281 }
78f0bacd
DG		 2282 break;
2283 }
2284 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2285 case LTTNG_DOMAIN_UST_EXEC_NAME:
2286 case LTTNG_DOMAIN_UST_PID:
2287 ret = LTTCOMM_NOT_IMPLEMENTED;
2288 goto error;
2289 default:
2290 ret = LTTCOMM_UNKNOWN_DOMAIN;
2291 goto error;
20fe2104
DG		 2292 }
2293
54d01ffb 2294 ret = LTTCOMM_OK;
d65106b1 2295
54d01ffb
DG		 2296error:
2297 return ret;
2298}
2299
2300/*
2301 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2302 */
44d3bd01 2303static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2304 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2305{
2306 int ret;
f6a9efaa 2307 struct ltt_ust_session *usess = session->ust_session;
bec39940 2308 struct lttng_ht *chan_ht;
f6a9efaa 2309
5d56b5aa 2310 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2311
aea829b3 2312 switch (domain) {
44d3bd01
DG		 2313 case LTTNG_DOMAIN_KERNEL:
2314 {
2315 struct ltt_kernel_channel *kchan;
54d01ffb 2316
44d3bd01
DG		 2317 kchan = trace_kernel_get_channel_by_name(attr->name,
2318 session->kernel_session);
2319 if (kchan == NULL) {
2320 ret = channel_kernel_create(session->kernel_session,
2321 attr, kernel_poll_pipe[1]);
2322 } else {
2323 ret = channel_kernel_enable(session->kernel_session, kchan);
2324 }
2325
2326 if (ret != LTTCOMM_OK) {
2327 goto error;
2328 }
2329
2330 kernel_wait_quiescent(kernel_tracer_fd);
2331 break;
2332 }
f6a9efaa
DG		 2333 case LTTNG_DOMAIN_UST:
2334 {
2335 struct ltt_ust_channel *uchan;
2336
7885e399 2337 chan_ht = usess->domain_global.channels;
f6a9efaa 2338
7885e399 2339 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2340 if (uchan == NULL) {
7885e399 2341 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2342 } else {
7885e399 2343 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2344 }
f6a9efaa
DG		 2345 break;
2346 }
78f0bacd
DG		 2347 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2348 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2349 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG		 2350 ret = LTTCOMM_NOT_IMPLEMENTED;
2351 goto error;
44d3bd01
DG		 2352 default:
2353 ret = LTTCOMM_UNKNOWN_DOMAIN;
2354 goto error;
54d01ffb
DG		 2355 }
2356
54d01ffb
DG		 2357error:
2358 return ret;
2359}
2360
2361/*
2362 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2363 */
2364static int cmd_disable_event(struct ltt_session *session, int domain,
2365 char *channel_name, char *event_name)
2366{
2367 int ret;
54d01ffb
DG		 2368
2369 switch (domain) {
2370 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2371 {
2372 struct ltt_kernel_channel *kchan;
b0a40d28 2373 struct ltt_kernel_session *ksess;
2bdd86d4 2374
b0a40d28
DG		 2375 ksess = session->kernel_session;
2376
2377 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2378 if (kchan == NULL) {
2379 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2380 goto error;
d65106b1
DG		 2381 }
2382
b0a40d28 2383 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2384 if (ret != LTTCOMM_OK) {
2385 goto error;
2386 }
2387
2388 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2389 break;
2bdd86d4
MD		 2390 }
2391 case LTTNG_DOMAIN_UST:
b0a40d28 2392 {
b0a40d28 2393 struct ltt_ust_channel *uchan;
7f79d3a1 2394 struct ltt_ust_session *usess;
b0a40d28
DG		 2395
2396 usess = session->ust_session;
2397
2398 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2399 channel_name);
2400 if (uchan == NULL) {
2401 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2402 goto error;
2403 }
2404
7f79d3a1
DG		 2405 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2406 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2407 goto error;
2408 }
2409
7f79d3a1 2410 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2411 channel_name);
b0a40d28
DG		 2412 break;
2413 }
2bdd86d4
MD		 2414 case LTTNG_DOMAIN_UST_EXEC_NAME:
2415 case LTTNG_DOMAIN_UST_PID:
2416 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2417 default:
54d01ffb
DG		 2418 ret = LTTCOMM_NOT_IMPLEMENTED;
2419 goto error;
d65106b1 2420 }
26cc6b4e 2421
54d01ffb
DG		 2422 ret = LTTCOMM_OK;
2423
2424error:
2425 return ret;
2426}
2427
2428/*
2429 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2430 */
2431static int cmd_disable_event_all(struct ltt_session *session, int domain,
2432 char *channel_name)
2433{
2434 int ret;
54d01ffb
DG		 2435
2436 switch (domain) {
2437 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2438 {
2439 struct ltt_kernel_session *ksess;
2440 struct ltt_kernel_channel *kchan;
2441
2442 ksess = session->kernel_session;
2443
2444 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2445 if (kchan == NULL) {
2446 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2447 goto error;
26cc6b4e
DG		 2448 }
2449
9730260e 2450 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2451 if (ret != LTTCOMM_OK) {
0b97ec54 2452 goto error;
26cc6b4e
DG		 2453 }
2454
54d01ffb 2455 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2456 break;
9730260e
DG		 2457 }
2458 case LTTNG_DOMAIN_UST:
2459 {
2460 struct ltt_ust_session *usess;
2461 struct ltt_ust_channel *uchan;
2462
2463 usess = session->ust_session;
2464
2465 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2466 channel_name);
2467 if (uchan == NULL) {
2468 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2469 goto error;
2470 }
2471
7f79d3a1
DG		 2472 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2473 if (ret != 0) {
9730260e
DG		 2474 goto error;
2475 }
2476
7f79d3a1 2477 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2478
2479 break;
2480 }
2481 case LTTNG_DOMAIN_UST_EXEC_NAME:
2482 case LTTNG_DOMAIN_UST_PID:
2483 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2484 default:
54d01ffb
DG		 2485 ret = LTTCOMM_NOT_IMPLEMENTED;
2486 goto error;
26cc6b4e 2487 }
e953ef25 2488
54d01ffb 2489 ret = LTTCOMM_OK;
e953ef25 2490
54d01ffb
DG		 2491error:
2492 return ret;
2493}
f5177a38 2494
54d01ffb
DG		 2495/*
2496 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2497 */
2498static int cmd_add_context(struct ltt_session *session, int domain,
2499 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2500{
2501 int ret;
f5177a38 2502
54d01ffb
DG		 2503 switch (domain) {
2504 case LTTNG_DOMAIN_KERNEL:
2505 /* Add kernel context to kernel tracer */
2506 ret = context_kernel_add(session->kernel_session, ctx,
2507 event_name, channel_name);
2508 if (ret != LTTCOMM_OK) {
f5177a38 2509 goto error;
e953ef25 2510 }
2bdd86d4
MD		 2511 break;
2512 case LTTNG_DOMAIN_UST:
2513 {
55cc08a6 2514 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2515
55cc08a6
DG		 2516 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2517 if (ret != LTTCOMM_OK) {
2518 goto error;
2bdd86d4 2519 }
e953ef25 2520 break;
2bdd86d4 2521 }
55cc08a6
DG		 2522 case LTTNG_DOMAIN_UST_EXEC_NAME:
2523 case LTTNG_DOMAIN_UST_PID:
2524 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2525 default:
54d01ffb
DG		 2526 ret = LTTCOMM_NOT_IMPLEMENTED;
2527 goto error;
e953ef25 2528 }
950131af 2529
54d01ffb 2530 ret = LTTCOMM_OK;
950131af 2531
54d01ffb
DG		 2532error:
2533 return ret;
2534}
2535
2536/*
2537 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD		 2538 *
2539 * TODO: currently, both events and loglevels are kept within the same
2540 * namespace for UST global registry/app registery, so if an event
2541 * happen to have the same name as the loglevel (very unlikely though),
2542 * and an attempt is made to enable/disable both in the same session,
2543 * the first to be created will be the only one allowed to exist.
54d01ffb
DG		 2544 */
2545static int cmd_enable_event(struct ltt_session *session, int domain,
2546 char *channel_name, struct lttng_event *event)
2547{
2548 int ret;
f6cd6b0f 2549 struct lttng_channel *attr;
48842b30 2550 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2551
2552 switch (domain) {
2553 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2554 {
2555 struct ltt_kernel_channel *kchan;
2556
54d01ffb
DG		 2557 kchan = trace_kernel_get_channel_by_name(channel_name,
2558 session->kernel_session);
2559 if (kchan == NULL) {
f6cd6b0f
DG		 2560 attr = channel_new_default_attr(domain);
2561 if (attr == NULL) {
2562 ret = LTTCOMM_FATAL;
2563 goto error;
2564 }
2565 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2566
54d01ffb 2567 /* This call will notify the kernel thread */
44d3bd01 2568 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2569 attr, kernel_poll_pipe[1]);
54d01ffb 2570 if (ret != LTTCOMM_OK) {
ff4d74e6 2571 free(attr);
f5177a38
DG		 2572 goto error;
2573 }
ff4d74e6 2574 free(attr);
54d01ffb 2575 }
950131af 2576
54d01ffb
DG		 2577 /* Get the newly created kernel channel pointer */
2578 kchan = trace_kernel_get_channel_by_name(channel_name,
2579 session->kernel_session);
2580 if (kchan == NULL) {
2581 /* This sould not happen... */
2582 ret = LTTCOMM_FATAL;
2583 goto error;
2584 }
f5177a38 2585
48842b30
DG		 2586 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2587 event);
54d01ffb 2588 if (ret != LTTCOMM_OK) {
f5177a38 2589 goto error;
950131af
DG		 2590 }
2591
54d01ffb 2592 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2593 break;
2bdd86d4
MD		 2594 }
2595 case LTTNG_DOMAIN_UST:
2596 {
aea829b3 2597 struct lttng_channel *attr;
edb67388 2598 struct ltt_ust_channel *uchan;
2bdd86d4 2599
edb67388 2600 /* Get channel from global UST domain */
48842b30
DG		 2601 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2602 channel_name);
2603 if (uchan == NULL) {
aea829b3
DG		 2604 /* Create default channel */
2605 attr = channel_new_default_attr(domain);
2606 if (attr == NULL) {
2607 ret = LTTCOMM_FATAL;
2608 goto error;
2609 }
596219f7 2610 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2611 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2612
7885e399 2613 ret = channel_ust_create(usess, domain, attr);
edb67388 2614 if (ret != LTTCOMM_OK) {
ff4d74e6 2615 free(attr);
aea829b3
DG		 2616 goto error;
2617 }
aea829b3
DG		 2618 free(attr);
2619
2620 /* Get the newly created channel reference back */
2621 uchan = trace_ust_find_channel_by_name(
2622 usess->domain_global.channels, channel_name);
2623 if (uchan == NULL) {
2624 /* Something is really wrong */
2625 ret = LTTCOMM_FATAL;
2626 goto error;
2627 }
48842b30 2628 }
2bdd86d4 2629
edb67388 2630 /* At this point, the session and channel exist on the tracer */
edb67388
DG		 2631 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2632 if (ret != LTTCOMM_OK) {
48842b30 2633 goto error;
2bdd86d4
MD		 2634 }
2635 break;
2636 }
2637 case LTTNG_DOMAIN_UST_EXEC_NAME:
2638 case LTTNG_DOMAIN_UST_PID:
2639 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2640 default:
54d01ffb
DG		 2641 ret = LTTCOMM_NOT_IMPLEMENTED;
2642 goto error;
950131af 2643 }
d36b8583 2644
54d01ffb 2645 ret = LTTCOMM_OK;
d36b8583 2646
54d01ffb
DG		 2647error:
2648 return ret;
2649}
7d29a247 2650
54d01ffb
DG		 2651/*
2652 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2653 */
2654static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2655 char *channel_name, int event_type)
54d01ffb
DG		 2656{
2657 int ret;
2658 struct ltt_kernel_channel *kchan;
7d29a247 2659
54d01ffb
DG		 2660 switch (domain) {
2661 case LTTNG_DOMAIN_KERNEL:
2662 kchan = trace_kernel_get_channel_by_name(channel_name,
2663 session->kernel_session);
2664 if (kchan == NULL) {
2665 /* This call will notify the kernel thread */
44d3bd01
DG		 2666 ret = channel_kernel_create(session->kernel_session, NULL,
2667 kernel_poll_pipe[1]);
54d01ffb
DG		 2668 if (ret != LTTCOMM_OK) {
2669 goto error;
d36b8583 2670 }
0d0c377a 2671
8f69e5eb
DG		 2672 /* Get the newly created kernel channel pointer */
2673 kchan = trace_kernel_get_channel_by_name(channel_name,
2674 session->kernel_session);
2675 if (kchan == NULL) {
2676 /* This sould not happen... */
2677 ret = LTTCOMM_FATAL;
2678 goto error;
2679 }
2680
54d01ffb 2681 }
0fdd1e2c 2682
7a3d1328 2683 switch (event_type) {
76d45b40 2684 case LTTNG_EVENT_SYSCALL:
7a3d1328 2685 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2686 kchan, kernel_tracer_fd);
7a3d1328 2687 break;
76d45b40 2688 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2689 /*
7a3d1328
MD		 2690 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2691 * events already registered to the channel.
8c9ae521 2692 */
7a3d1328
MD		 2693 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2694 kchan, kernel_tracer_fd);
2695 break;
76d45b40 2696 case LTTNG_EVENT_ALL:
7a3d1328 2697 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2698 ret = event_kernel_enable_all(session->kernel_session,
2699 kchan, kernel_tracer_fd);
7a3d1328
MD		 2700 break;
2701 default:
2702 ret = LTTCOMM_KERN_ENABLE_FAIL;
2703 goto error;
8c9ae521 2704 }
8f69e5eb
DG		 2705
2706 /* Manage return value */
54d01ffb 2707 if (ret != LTTCOMM_OK) {
0d0c377a 2708 goto error;
d36b8583
DG		 2709 }
2710
54d01ffb 2711 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2712 break;
76d45b40
DG		 2713 case LTTNG_DOMAIN_UST:
2714 {
2715 struct lttng_channel *attr;
2716 struct ltt_ust_channel *uchan;
2717 struct ltt_ust_session *usess = session->ust_session;
2718
2719 /* Get channel from global UST domain */
2720 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2721 channel_name);
2722 if (uchan == NULL) {
2723 /* Create default channel */
2724 attr = channel_new_default_attr(domain);
2725 if (attr == NULL) {
2726 ret = LTTCOMM_FATAL;
2727 goto error;
2728 }
2729 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2730 attr->name[NAME_MAX - 1] = '\0';
2731
2732 /* Use the internal command enable channel */
7885e399 2733 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2734 if (ret != LTTCOMM_OK) {
2735 free(attr);
2736 goto error;
2737 }
2738 free(attr);
2739
2740 /* Get the newly created channel reference back */
2741 uchan = trace_ust_find_channel_by_name(
2742 usess->domain_global.channels, channel_name);
2743 if (uchan == NULL) {
2744 /* Something is really wrong */
2745 ret = LTTCOMM_FATAL;
2746 goto error;
2747 }
2748 }
2749
2750 /* At this point, the session and channel exist on the tracer */
2751
2752 switch (event_type) {
2753 case LTTNG_EVENT_ALL:
2754 case LTTNG_EVENT_TRACEPOINT:
2755 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2756 if (ret != LTTCOMM_OK) {
2757 goto error;
2758 }
2759 break;
2760 default:
2761 ret = LTTCOMM_UST_ENABLE_FAIL;
2762 goto error;
2763 }
2764
2765 /* Manage return value */
2766 if (ret != LTTCOMM_OK) {
2767 goto error;
2768 }
2769
2770 break;
2771 }
2772 case LTTNG_DOMAIN_UST_EXEC_NAME:
2773 case LTTNG_DOMAIN_UST_PID:
2774 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2775 default:
54d01ffb
DG		 2776 ret = LTTCOMM_NOT_IMPLEMENTED;
2777 goto error;
d36b8583 2778 }
f3ed775e 2779
54d01ffb
DG		 2780 ret = LTTCOMM_OK;
2781
2782error:
2783 return ret;
2784}
2785
2786/*
2787 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2788 */
2789static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2790{
2791 int ret;
2792 ssize_t nb_events = 0;
2793
2794 switch (domain) {
2795 case LTTNG_DOMAIN_KERNEL:
2796 nb_events = kernel_list_events(kernel_tracer_fd, events);
2797 if (nb_events < 0) {
2798 ret = LTTCOMM_KERN_LIST_FAIL;
2799 goto error;
894be886 2800 }
54d01ffb 2801 break;
b551a063
DG		 2802 case LTTNG_DOMAIN_UST:
2803 nb_events = ust_app_list_events(events);
2804 if (nb_events < 0) {
2805 ret = LTTCOMM_UST_LIST_FAIL;
2806 goto error;
2807 }
2808 break;
54d01ffb 2809 default:
54d01ffb
DG		 2810 ret = LTTCOMM_NOT_IMPLEMENTED;
2811 goto error;
2812 }
894be886 2813
54d01ffb 2814 return nb_events;
7d29a247 2815
54d01ffb
DG		 2816error:
2817 /* Return negative value to differentiate return code */
2818 return -ret;
2819}
b389abbe 2820
54d01ffb
DG		 2821/*
2822 * Command LTTNG_START_TRACE processed by the client thread.
2823 */
2824static int cmd_start_trace(struct ltt_session *session)
2825{
2826 int ret;
54d01ffb 2827 struct ltt_kernel_session *ksession;
b9d9b220 2828 struct ltt_ust_session *usess;
b389abbe 2829
54d01ffb
DG		 2830 /* Short cut */
2831 ksession = session->kernel_session;
b9d9b220 2832 usess = session->ust_session;
5eb91c98 2833
b9ef1c83
DG		 2834 if (session->enabled) {
2835 ret = LTTCOMM_UST_START_FAIL;
2836 goto error;
2837 }
2838
464dd62d
MD		 2839 session->enabled = 1;
2840
54d01ffb
DG		 2841 /* Kernel tracing */
2842 if (ksession != NULL) {
2bdd86d4
MD		 2843 struct ltt_kernel_channel *kchan;
2844
54d01ffb
DG		 2845 /* Open kernel metadata */
2846 if (ksession->metadata == NULL) {
2847 ret = kernel_open_metadata(ksession, ksession->trace_path);
2848 if (ret < 0) {
2849 ret = LTTCOMM_KERN_META_FAIL;
2850 goto error;
b389abbe 2851 }
54d01ffb 2852 }
7d29a247 2853
54d01ffb
DG		 2854 /* Open kernel metadata stream */
2855 if (ksession->metadata_stream_fd == 0) {
2856 ret = kernel_open_metadata_stream(ksession);
2857 if (ret < 0) {
2858 ERR("Kernel create metadata stream failed");
2859 ret = LTTCOMM_KERN_STREAM_FAIL;
2860 goto error;
2861 }
2862 }
2863
2864 /* For each channel */
2865 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2866 if (kchan->stream_count == 0) {
2867 ret = kernel_open_channel_stream(kchan);
2868 if (ret < 0) {
2869 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2870 goto error;
2871 }
54d01ffb
DG		 2872 /* Update the stream global counter */
2873 ksession->stream_count_global += ret;
7d29a247 2874 }
54d01ffb
DG		 2875 }
2876
2877 /* Setup kernel consumer socket and send fds to it */
2878 ret = init_kernel_tracing(ksession);
2879 if (ret < 0) {
2880 ret = LTTCOMM_KERN_START_FAIL;
2881 goto error;
2882 }
2883
2884 /* This start the kernel tracing */
2885 ret = kernel_start_session(ksession);
2886 if (ret < 0) {
2887 ret = LTTCOMM_KERN_START_FAIL;
2888 goto error;
2889 }
2890
2891 /* Quiescent wait after starting trace */
2892 kernel_wait_quiescent(kernel_tracer_fd);
2893 }
2894
36dc12cc 2895 /* Flag session that trace should start automatically */
b9d9b220
DG		 2896 if (usess) {
2897 usess->start_trace = 1;
36dc12cc 2898
b9d9b220
DG		 2899 ret = ust_app_start_trace_all(usess);
2900 if (ret < 0) {
2901 ret = LTTCOMM_UST_START_FAIL;
2902 goto error;
2903 }
2bdd86d4 2904 }
54d01ffb
DG		 2905
2906 ret = LTTCOMM_OK;
2907
2908error:
2909 return ret;
2910}
2911
2912/*
2913 * Command LTTNG_STOP_TRACE processed by the client thread.
2914 */
2915static int cmd_stop_trace(struct ltt_session *session)
2916{
2917 int ret;
2918 struct ltt_kernel_channel *kchan;
2919 struct ltt_kernel_session *ksession;
8be98f9a 2920 struct ltt_ust_session *usess;
54d01ffb
DG		 2921
2922 /* Short cut */
2923 ksession = session->kernel_session;
8be98f9a 2924 usess = session->ust_session;
54d01ffb 2925
b9ef1c83 2926 if (!session->enabled) {
190df5ac 2927 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG		 2928 goto error;
2929 }
2930
464dd62d
MD		 2931 session->enabled = 0;
2932
54d01ffb
DG		 2933 /* Kernel tracer */
2934 if (ksession != NULL) {
2935 DBG("Stop kernel tracing");
2936
2937 /* Flush all buffers before stopping */
2938 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2939 if (ret < 0) {
2940 ERR("Kernel metadata flush failed");
2941 }
f34daff7 2942
54d01ffb
DG		 2943 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2944 ret = kernel_flush_buffer(kchan);
0d0c377a 2945 if (ret < 0) {
54d01ffb 2946 ERR("Kernel flush buffer error");
7d29a247 2947 }
54d01ffb 2948 }
19e70852 2949
54d01ffb
DG		 2950 ret = kernel_stop_session(ksession);
2951 if (ret < 0) {
2952 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2953 goto error;
f3ed775e 2954 }
54d01ffb
DG		 2955
2956 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2957 }
54d01ffb 2958
8be98f9a
MD		 2959 if (usess) {
2960 usess->start_trace = 0;
2bdd86d4 2961
8be98f9a 2962 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2963 if (ret < 0) {
190df5ac 2964 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD		 2965 goto error;
2966 }
2bdd86d4 2967 }
54d01ffb
DG		 2968
2969 ret = LTTCOMM_OK;
2970
2971error:
2972 return ret;
2973}
2974
2975/*
2976 * Command LTTNG_CREATE_SESSION processed by the client thread.
2977 */
6df2e2c9 2978static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG		 2979{
2980 int ret;
2981
6df2e2c9 2982 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG		 2983 if (ret != LTTCOMM_OK) {
2984 goto error;
2985 }
2986
2987 ret = LTTCOMM_OK;
2988
2989error:
2990 return ret;
2991}
2992
2993/*
2994 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2995 */
2996static int cmd_destroy_session(struct ltt_session *session, char *name)
2997{
2998 int ret;
2999
3000 /* Clean kernel session teardown */
3001 teardown_kernel_session(session);
84cd17c6
MD		 3002 /* UST session teardown */
3003 teardown_ust_session(session);
54d01ffb
DG		 3004
3005 /*
3006 * Must notify the kernel thread here to update it's poll setin order
3007 * to remove the channel(s)' fd just destroyed.
3008 */
3009 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3010 if (ret < 0) {
3011 perror("write kernel poll pipe");
3012 }
3013
271933a4 3014 ret = session_destroy(session);
54d01ffb
DG		 3015
3016 return ret;
3017}
3018
3019/*
3020 * Command LTTNG_CALIBRATE processed by the client thread.
3021 */
3022static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3023{
3024 int ret;
3025
3026 switch (domain) {
3027 case LTTNG_DOMAIN_KERNEL:
33a2b854 3028 {
54d01ffb 3029 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3030
54d01ffb
DG		 3031 kcalibrate.type = calibrate->type;
3032 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3033 if (ret < 0) {
54d01ffb
DG		 3034 ret = LTTCOMM_KERN_ENABLE_FAIL;
3035 goto error;
33a2b854 3036 }
54d01ffb
DG		 3037 break;
3038 }
3039 default:
3040 /* TODO: Userspace tracing */
3041 ret = LTTCOMM_NOT_IMPLEMENTED;
3042 goto error;
3043 }
33a2b854 3044
54d01ffb 3045 ret = LTTCOMM_OK;
33a2b854 3046
54d01ffb
DG		 3047error:
3048 return ret;
3049}
7d29a247 3050
54d01ffb
DG		 3051/*
3052 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3053 */
3054static int cmd_register_consumer(struct ltt_session *session, int domain,
3055 char *sock_path)
3056{
3057 int ret, sock;
b389abbe 3058
54d01ffb
DG		 3059 switch (domain) {
3060 case LTTNG_DOMAIN_KERNEL:
3061 /* Can't register a consumer if there is already one */
48c4f28c 3062 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 3063 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3064 goto error;
3065 }
3066
3067 sock = lttcomm_connect_unix_sock(sock_path);
3068 if (sock < 0) {
3069 ret = LTTCOMM_CONNECT_FAIL;
3070 goto error;
3071 }
3072
3073 session->kernel_session->consumer_fd = sock;
3074 break;
3075 default:
3076 /* TODO: Userspace tracing */
3077 ret = LTTCOMM_NOT_IMPLEMENTED;
3078 goto error;
3079 }
3080
3081 ret = LTTCOMM_OK;
3082
3083error:
3084 return ret;
3085}
3086
3087/*
3088 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3089 */
3090static ssize_t cmd_list_domains(struct ltt_session *session,
3091 struct lttng_domain **domains)
3092{
b551a063 3093 int ret, index = 0;
54d01ffb
DG		 3094 ssize_t nb_dom = 0;
3095
3096 if (session->kernel_session != NULL) {
b551a063 3097 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3098 nb_dom++;
3099 }
3100
b551a063
DG		 3101 if (session->ust_session != NULL) {
3102 DBG3("Listing domains found UST global domain");
3103 nb_dom++;
3104 }
54d01ffb 3105
b551a063 3106 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3107 if (*domains == NULL) {
3108 ret = -LTTCOMM_FATAL;
3109 goto error;
3110 }
3111
b551a063
DG		 3112 if (session->kernel_session != NULL) {
3113 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3114 index++;
3115 }
3116
3117 if (session->ust_session != NULL) {
3118 (*domains)[index].type = LTTNG_DOMAIN_UST;
3119 index++;
3120 }
54d01ffb 3121
54d01ffb
DG		 3122 return nb_dom;
3123
3124error:
3125 return ret;
3126}
3127
3128/*
3129 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3130 */
b551a063 3131static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3132 struct lttng_channel **channels)
3133{
3134 int ret;
3135 ssize_t nb_chan = 0;
3136
b551a063
DG		 3137 switch (domain) {
3138 case LTTNG_DOMAIN_KERNEL:
3139 if (session->kernel_session != NULL) {
3140 nb_chan = session->kernel_session->channel_count;
3141 }
0df502fd 3142 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3143 break;
3144 case LTTNG_DOMAIN_UST:
3145 if (session->ust_session != NULL) {
bec39940 3146 nb_chan = lttng_ht_get_count(
b551a063
DG		 3147 session->ust_session->domain_global.channels);
3148 }
0df502fd 3149 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3150 break;
3151 default:
3152 *channels = NULL;
3153 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3154 goto error;
3155 }
3156
b551a063
DG		 3157 if (nb_chan > 0) {
3158 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3159 if (*channels == NULL) {
3160 ret = -LTTCOMM_FATAL;
3161 goto error;
3162 }
54d01ffb 3163
b551a063
DG		 3164 list_lttng_channels(domain, session, *channels);
3165 } else {
3166 *channels = NULL;
3167 }
2bdd86d4 3168
54d01ffb
DG		 3169 return nb_chan;
3170
3171error:
3172 return ret;
3173}
3174
3175/*
3176 * Command LTTNG_LIST_EVENTS processed by the client thread.
3177 */
b551a063 3178static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3179 char *channel_name, struct lttng_event **events)
3180{
b551a063 3181 int ret = 0;
54d01ffb 3182 ssize_t nb_event = 0;
54d01ffb 3183
b551a063
DG		 3184 switch (domain) {
3185 case LTTNG_DOMAIN_KERNEL:
3186 if (session->kernel_session != NULL) {
3187 nb_event = list_lttng_kernel_events(channel_name,
3188 session->kernel_session, events);
54d01ffb 3189 }
b551a063
DG		 3190 break;
3191 case LTTNG_DOMAIN_UST:
3192 {
3193 if (session->ust_session != NULL) {
3194 nb_event = list_lttng_ust_global_events(channel_name,
3195 &session->ust_session->domain_global, events);
3196 }
3197 break;
54d01ffb 3198 }
b551a063
DG		 3199 default:
3200 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3201 goto error;
3202 }
3203
b551a063 3204 ret = nb_event;
54d01ffb
DG		 3205
3206error:
3207 return ret;
3208}
3209
3210/*
3211 * Process the command requested by the lttng client within the command
3212 * context structure. This function make sure that the return structure (llm)
3213 * is set and ready for transmission before returning.
3214 *
3215 * Return any error encountered or 0 for success.
3216 */
3217static int process_client_msg(struct command_ctx *cmd_ctx)
3218{
3219 int ret = LTTCOMM_OK;
44d3bd01 3220 int need_tracing_session = 1;
54d01ffb
DG		 3221
3222 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3223
4fba7219
DG		 3224 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3225 ret = LTTCOMM_KERN_NA;
3226 goto error;
3227 }
3228
54d01ffb
DG		 3229 /*
3230 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3231 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3232 * command.
3233 */
3234 switch(cmd_ctx->lsm->cmd_type) {
3235 case LTTNG_LIST_SESSIONS:
3236 case LTTNG_LIST_TRACEPOINTS:
3237 case LTTNG_LIST_DOMAINS:
3238 case LTTNG_LIST_CHANNELS:
3239 case LTTNG_LIST_EVENTS:
3240 break;
3241 default:
3242 /* Setup lttng message with no payload */
3243 ret = setup_lttng_msg(cmd_ctx, 0);
3244 if (ret < 0) {
3245 /* This label does not try to unlock the session */
3246 goto init_setup_error;
3247 }
3248 }
3249
3250 /* Commands that DO NOT need a session. */
3251 switch (cmd_ctx->lsm->cmd_type) {
3252 case LTTNG_CALIBRATE:
3253 case LTTNG_CREATE_SESSION:
3254 case LTTNG_LIST_SESSIONS:
3255 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3256 need_tracing_session = 0;
54d01ffb
DG		 3257 break;
3258 default:
3259 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3260 session_lock_list();
54d01ffb 3261 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3262 session_unlock_list();
54d01ffb
DG		 3263 if (cmd_ctx->session == NULL) {
3264 if (cmd_ctx->lsm->session.name != NULL) {
3265 ret = LTTCOMM_SESS_NOT_FOUND;
3266 } else {
3267 /* If no session name specified */
3268 ret = LTTCOMM_SELECT_SESS;
3269 }
3270 goto error;
3271 } else {
3272 /* Acquire lock for the session */
3273 session_lock(cmd_ctx->session);
3274 }
3275 break;
3276 }
b389abbe 3277
54d01ffb
DG		 3278 /*
3279 * Check domain type for specific "pre-action".
3280 */
3281 switch (cmd_ctx->lsm->domain.type) {
3282 case LTTNG_DOMAIN_KERNEL:
3283 /* Kernel tracer check */
3284 if (kernel_tracer_fd == 0) {
3285 /* Basically, load kernel tracer modules */
3286 init_kernel_tracer();
3287 if (kernel_tracer_fd == 0) {
3288 ret = LTTCOMM_KERN_NA;
3289 goto error;
3290 }
3291 }
5eb91c98 3292
54d01ffb 3293 /* Need a session for kernel command */
44d3bd01 3294 if (need_tracing_session) {
54d01ffb 3295 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 3296 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3297 if (ret < 0) {
54d01ffb 3298 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3299 goto error;
3300 }
b389abbe 3301 }
7d29a247 3302
54d01ffb 3303 /* Start the kernel consumer daemon */
3bd1e081
MD		 3304 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3305 if (kconsumer_data.pid == 0 &&
54d01ffb 3306 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3307 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3308 ret = start_consumerd(&kconsumer_data);
7d29a247 3309 if (ret < 0) {
54d01ffb
DG		 3310 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3311 goto error;
950131af 3312 }
3ff2ecac
MD		 3313 } else {
3314 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3315 }
0d0c377a 3316 }
54d01ffb 3317 break;
2bdd86d4 3318 case LTTNG_DOMAIN_UST:
44d3bd01 3319 {
44d3bd01 3320 if (need_tracing_session) {
f6a9efaa 3321 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3322 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3323 &cmd_ctx->lsm->domain);
44d3bd01
DG		 3324 if (ret != LTTCOMM_OK) {
3325 goto error;
3326 }
3327 }
7753dea8
MD		 3328 /* Start the UST consumer daemons */
3329 /* 64-bit */
3330 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3331 if (consumerd64_bin[0] != '\0' &&
7753dea8 3332 ustconsumer64_data.pid == 0 &&
2bdd86d4 3333 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3334 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3335 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3336 if (ret < 0) {
7753dea8
MD		 3337 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3338 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3339 goto error;
3340 }
48842b30 3341
7753dea8 3342 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3343 } else {
7753dea8
MD		 3344 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3345 }
3346 /* 32-bit */
fc7a59ce 3347 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3348 ustconsumer32_data.pid == 0 &&
3349 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3350 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3351 ret = start_consumerd(&ustconsumer32_data);
3352 if (ret < 0) {
3353 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3354 ust_consumerd32_fd = -EINVAL;
3355 goto error;
3356 }
3357 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3358 } else {
3359 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3360 }
44d3bd01
DG		 3361 }
3362 break;
48842b30 3363 }
54d01ffb 3364 default:
54d01ffb
DG		 3365 break;
3366 }
33a2b854 3367
8e0af1b4
MD		 3368 /*
3369 * Check that the UID or GID match that of the tracing session.
3370 * The root user can interact with all sessions.
3371 */
3372 if (need_tracing_session) {
3373 if (!session_access_ok(cmd_ctx->session,
3374 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3375 ret = LTTCOMM_EPERM;
3376 goto error;
3377 }
3378 }
3379
54d01ffb
DG		 3380 /* Process by command type */
3381 switch (cmd_ctx->lsm->cmd_type) {
3382 case LTTNG_ADD_CONTEXT:
3383 {
3384 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3385 cmd_ctx->lsm->u.context.channel_name,
3386 cmd_ctx->lsm->u.context.event_name,
3387 &cmd_ctx->lsm->u.context.ctx);
3388 break;
3389 }
3390 case LTTNG_DISABLE_CHANNEL:
3391 {
3392 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3393 cmd_ctx->lsm->u.disable.channel_name);
3394 break;
3395 }
3396 case LTTNG_DISABLE_EVENT:
3397 {
3398 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3399 cmd_ctx->lsm->u.disable.channel_name,
3400 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3401 ret = LTTCOMM_OK;
3402 break;
3403 }
54d01ffb
DG		 3404 case LTTNG_DISABLE_ALL_EVENT:
3405 {
2bdd86d4 3406 DBG("Disabling all events");
54d01ffb
DG		 3407
3408 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3409 cmd_ctx->lsm->u.disable.channel_name);
3410 break;
3411 }
3412 case LTTNG_ENABLE_CHANNEL:
3413 {
aea829b3 3414 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3415 &cmd_ctx->lsm->u.channel.chan);
3416 break;
3417 }
3418 case LTTNG_ENABLE_EVENT:
3419 {
3420 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3421 cmd_ctx->lsm->u.enable.channel_name,
3422 &cmd_ctx->lsm->u.enable.event);
3423 break;
3424 }
3425 case LTTNG_ENABLE_ALL_EVENT:
3426 {
2bdd86d4 3427 DBG("Enabling all events");
54d01ffb
DG		 3428
3429 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3430 cmd_ctx->lsm->u.enable.channel_name,
3431 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3432 break;
3433 }
052da939 3434 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3435 {
9f19cc17 3436 struct lttng_event *events;
54d01ffb 3437 ssize_t nb_events;
052da939 3438
54d01ffb
DG		 3439 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3440 if (nb_events < 0) {
3441 ret = -nb_events;
3442 goto error;
2ef84c95
DG		 3443 }
3444
3445 /*
3446 * Setup lttng message with payload size set to the event list size in
3447 * bytes and then copy list into the llm payload.
3448 */
052da939 3449 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3450 if (ret < 0) {
052da939 3451 free(events);
2ef84c95
DG		 3452 goto setup_error;
3453 }
3454
3455 /* Copy event list into message payload */
9f19cc17 3456 memcpy(cmd_ctx->llm->payload, events,
052da939 3457 sizeof(struct lttng_event) * nb_events);
2ef84c95 3458
9f19cc17 3459 free(events);
2ef84c95
DG		 3460
3461 ret = LTTCOMM_OK;
3462 break;
3463 }
f3ed775e 3464 case LTTNG_START_TRACE:
8c0faa1d 3465 {
54d01ffb 3466 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3467 break;
3468 }
f3ed775e 3469 case LTTNG_STOP_TRACE:
8c0faa1d 3470 {
54d01ffb 3471 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3472 break;
3473 }
5e16da05
MD		 3474 case LTTNG_CREATE_SESSION:
3475 {
54d01ffb 3476 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3477 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
5e16da05
MD		 3478 break;
3479 }
3480 case LTTNG_DESTROY_SESSION:
3481 {
54d01ffb
DG		 3482 ret = cmd_destroy_session(cmd_ctx->session,
3483 cmd_ctx->lsm->session.name);
5461b305 3484 break;
5e16da05 3485 }
9f19cc17 3486 case LTTNG_LIST_DOMAINS:
5e16da05 3487 {
54d01ffb
DG		 3488 ssize_t nb_dom;
3489 struct lttng_domain *domains;
5461b305 3490
54d01ffb
DG		 3491 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3492 if (nb_dom < 0) {
3493 ret = -nb_dom;
3494 goto error;
ce3d728c 3495 }
520ff687 3496
54d01ffb 3497 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3498 if (ret < 0) {
3499 goto setup_error;
520ff687 3500 }
57167058 3501
54d01ffb
DG		 3502 /* Copy event list into message payload */
3503 memcpy(cmd_ctx->llm->payload, domains,
3504 nb_dom * sizeof(struct lttng_domain));
3505
3506 free(domains);
5e16da05 3507
5461b305 3508 ret = LTTCOMM_OK;
5e16da05
MD		 3509 break;
3510 }
9f19cc17 3511 case LTTNG_LIST_CHANNELS:
5e16da05 3512 {
54d01ffb
DG		 3513 size_t nb_chan;
3514 struct lttng_channel *channels;
3515
b551a063
DG		 3516 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3517 cmd_ctx->session, &channels);
54d01ffb
DG		 3518 if (nb_chan < 0) {
3519 ret = -nb_chan;
3520 goto error;
5461b305 3521 }
ca95a216 3522
54d01ffb 3523 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3524 if (ret < 0) {
3525 goto setup_error;
3526 }
9f19cc17 3527
54d01ffb
DG		 3528 /* Copy event list into message payload */
3529 memcpy(cmd_ctx->llm->payload, channels,
3530 nb_chan * sizeof(struct lttng_channel));
3531
3532 free(channels);
9f19cc17
DG		 3533
3534 ret = LTTCOMM_OK;
5461b305 3535 break;
5e16da05 3536 }
9f19cc17 3537 case LTTNG_LIST_EVENTS:
5e16da05 3538 {
b551a063 3539 ssize_t nb_event;
684d34d2 3540 struct lttng_event *events = NULL;
9f19cc17 3541
b551a063 3542 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3543 cmd_ctx->lsm->u.list.channel_name, &events);
3544 if (nb_event < 0) {
3545 ret = -nb_event;
3546 goto error;
5461b305 3547 }
ca95a216 3548
54d01ffb 3549 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3550 if (ret < 0) {
3551 goto setup_error;
3552 }
9f19cc17 3553
54d01ffb
DG		 3554 /* Copy event list into message payload */
3555 memcpy(cmd_ctx->llm->payload, events,
3556 nb_event * sizeof(struct lttng_event));
9f19cc17 3557
54d01ffb 3558 free(events);
9f19cc17
DG		 3559
3560 ret = LTTCOMM_OK;
5461b305 3561 break;
5e16da05
MD		 3562 }
3563 case LTTNG_LIST_SESSIONS:
3564 {
8e0af1b4 3565 unsigned int nr_sessions;
5461b305 3566
8e0af1b4
MD		 3567 session_lock_list();
3568 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3569 if (nr_sessions == 0) {
f3ed775e 3570 ret = LTTCOMM_NO_SESSION;
54d01ffb 3571 session_unlock_list();
5461b305 3572 goto error;
57167058 3573 }
8e0af1b4 3574 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3575 if (ret < 0) {
54d01ffb 3576 session_unlock_list();
5461b305 3577 goto setup_error;
e065084a 3578 }
5e16da05 3579
6c9cc2ab 3580 /* Filled the session array */
8e0af1b4
MD		 3581 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3582 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
6c9cc2ab 3583
54d01ffb 3584 session_unlock_list();
5e16da05 3585
5461b305 3586 ret = LTTCOMM_OK;
5e16da05
MD		 3587 break;
3588 }
d0254c7c
MD		 3589 case LTTNG_CALIBRATE:
3590 {
54d01ffb
DG		 3591 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3592 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3593 break;
3594 }
d9800920
DG		 3595 case LTTNG_REGISTER_CONSUMER:
3596 {
54d01ffb
DG		 3597 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3598 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3599 break;
3600 }
5e16da05 3601 default:
5e16da05 3602 ret = LTTCOMM_UND;
5461b305 3603 break;
fac6795d
DG		 3604 }
3605
5461b305 3606error:
5461b305
DG		 3607 if (cmd_ctx->llm == NULL) {
3608 DBG("Missing llm structure. Allocating one.");
894be886 3609 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3610 goto setup_error;
3611 }
3612 }
54d01ffb 3613 /* Set return code */
5461b305 3614 cmd_ctx->llm->ret_code = ret;
5461b305 3615setup_error:
b5541356 3616 if (cmd_ctx->session) {
54d01ffb 3617 session_unlock(cmd_ctx->session);
b5541356 3618 }
54d01ffb 3619init_setup_error:
8028d920 3620 return ret;
fac6795d
DG		 3621}
3622
1d4b027a 3623/*
d063d709
DG		 3624 * This thread manage all clients request using the unix client socket for
3625 * communication.
1d4b027a
DG		 3626 */
3627static void *thread_manage_clients(void *data)
3628{
5eb91c98
DG		 3629 int sock = 0, ret, i, pollfd;
3630 uint32_t revents, nb_fd;
273ea72c 3631 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3632 struct lttng_poll_event events;
1d4b027a
DG		 3633
3634 DBG("[thread] Manage client started");
3635
f6a9efaa
DG		 3636 rcu_register_thread();
3637
1d4b027a
DG		 3638 ret = lttcomm_listen_unix_sock(client_sock);
3639 if (ret < 0) {
3640 goto error;
3641 }
3642
5eb91c98
DG		 3643 /*
3644 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3645 * more will be added to this poll set.
3646 */
3647 ret = create_thread_poll_set(&events, 2);
3648 if (ret < 0) {
3649 goto error;
3650 }
273ea72c 3651
5eb91c98
DG		 3652 /* Add the application registration socket */
3653 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3654 if (ret < 0) {
3655 goto error;
3656 }
273ea72c 3657
bbd973c2
DG		 3658 /*
3659 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3660 */
3661 if (opt_sig_parent) {
3662 kill(ppid, SIGCHLD);
3663 }
3664
3665 while (1) {
1d4b027a 3666 DBG("Accepting client command ...");
273ea72c 3667
5eb91c98
DG		 3668 nb_fd = LTTNG_POLL_GETNB(&events);
3669
273ea72c 3670 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3671 ret = lttng_poll_wait(&events, -1);
273ea72c 3672 if (ret < 0) {
273ea72c
DG		 3673 goto error;
3674 }
3675
5eb91c98
DG		 3676 for (i = 0; i < nb_fd; i++) {
3677 /* Fetch once the poll data */
3678 revents = LTTNG_POLL_GETEV(&events, i);
3679 pollfd = LTTNG_POLL_GETFD(&events, i);
3680
3681 /* Thread quit pipe has been closed. Killing thread. */
3682 ret = check_thread_quit_pipe(pollfd, revents);
3683 if (ret) {
3684 goto error;
3685 }
3686
3687 /* Event on the registration socket */
3688 if (pollfd == client_sock) {
3689 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3690 ERR("Client socket poll error");
3691 goto error;
3692 }
3693 }
3694 }
3695
3696 DBG("Wait for client response");
3697
3698 sock = lttcomm_accept_unix_sock(client_sock);
3699 if (sock < 0) {
273ea72c 3700 goto error;
273ea72c
DG		 3701 }
3702
be040666
DG		 3703 /* Set socket option for credentials retrieval */
3704 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3705 if (ret < 0) {
3706 goto error;
3707 }
3708
5eb91c98 3709 /* Allocate context command to process the client request */
ba7f0ae5 3710 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3711 if (cmd_ctx == NULL) {
ba7f0ae5 3712 perror("zmalloc cmd_ctx");
1d4b027a 3713 goto error;
5eb91c98 3714 }
1d4b027a 3715
5eb91c98 3716 /* Allocate data buffer for reception */
ba7f0ae5 3717 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3718 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3719 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3720 goto error;
3721 }
1d4b027a 3722
5eb91c98
DG		 3723 cmd_ctx->llm = NULL;
3724 cmd_ctx->session = NULL;
1d4b027a 3725
5eb91c98
DG		 3726 /*
3727 * Data is received from the lttng client. The struct
3728 * lttcomm_session_msg (lsm) contains the command and data request of
3729 * the client.
3730 */
3731 DBG("Receiving data from client ...");
be040666
DG		 3732 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3733 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG		 3734 if (ret <= 0) {
3735 DBG("Nothing recv() from client... continuing");
3736 close(sock);
3737 free(cmd_ctx);
3738 continue;
3739 }
1d4b027a 3740
5eb91c98
DG		 3741 // TODO: Validate cmd_ctx including sanity check for
3742 // security purpose.
f7776ea7 3743
f6a9efaa 3744 rcu_thread_online();
5eb91c98
DG		 3745 /*
3746 * This function dispatch the work to the kernel or userspace tracer
3747 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3748 * informations for the client. The command context struct contains
3749 * everything this function may needs.
3750 */
3751 ret = process_client_msg(cmd_ctx);
f6a9efaa 3752 rcu_thread_offline();
5eb91c98 3753 if (ret < 0) {
bbd973c2 3754 /*
5eb91c98 3755 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3756 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3757 * (ENOMEM). Error detected but still accept command.
bbd973c2 3758 */
bbd973c2 3759 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3760 continue;
3761 }
d6e4fca4 3762
54d01ffb
DG		 3763 DBG("Sending response (size: %d, retcode: %s)",
3764 cmd_ctx->lttng_msg_size,
9a745bc7 3765 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3766 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3767 if (ret < 0) {
3768 ERR("Failed to send data back to client");
bbd973c2 3769 }
1d4b027a 3770
5eb91c98 3771 /* End of transmission */
273ea72c 3772 close(sock);
be040666
DG		 3773
3774 clean_command_ctx(&cmd_ctx);
273ea72c
DG		 3775 }
3776
5eb91c98
DG		 3777error:
3778 DBG("Client thread dying");
273ea72c 3779 unlink(client_unix_sock_path);
5eb91c98
DG		 3780 close(client_sock);
3781 close(sock);
273ea72c 3782
5eb91c98 3783 lttng_poll_clean(&events);
a2fb29a5 3784 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3785
3786 rcu_unregister_thread();
1d4b027a
DG		 3787 return NULL;
3788}
3789
3790
fac6795d
DG		 3791/*
3792 * usage function on stderr
3793 */
3794static void usage(void)
3795{
b716ce68 3796 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3797 fprintf(stderr, " -h, --help Display this usage.\n");
3798 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3799 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3800 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3801 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3802 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3803 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3804 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3805 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3806 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3807 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3808 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3809 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3810 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3811 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3812 fprintf(stderr, " -V, --version Show version number.\n");
3813 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3814 fprintf(stderr, " -q, --quiet No output at all.\n");
3815 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3816 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3817 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3818}
3819
3820/*
3821 * daemon argument parsing
3822 */
3823static int parse_args(int argc, char **argv)
3824{
3825 int c;
3826
3827 static struct option long_options[] = {
3828 { "client-sock", 1, 0, 'c' },
3829 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3830 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3831 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3832 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3833 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3834 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3835 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3836 { "consumerd32-path", 1, 0, 'u' },
3837 { "consumerd32-libdir", 1, 0, 'U' },
3838 { "consumerd64-path", 1, 0, 't' },
3839 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3840 { "daemonize", 0, 0, 'd' },
5b8719f5 3841 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3842 { "help", 0, 0, 'h' },
3843 { "group", 1, 0, 'g' },
3844 { "version", 0, 0, 'V' },
75462a81 3845 { "quiet", 0, 0, 'q' },
3f9947db 3846 { "verbose", 0, 0, 'v' },
3bd1e081 3847 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3848 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3849 { NULL, 0, 0, 0 }
3850 };
3851
3852 while (1) {
3853 int option_index = 0;
4fba7219 3854 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3855 long_options, &option_index);
fac6795d
DG		 3856 if (c == -1) {
3857 break;
3858 }
3859
3860 switch (c) {
3861 case 0:
3862 fprintf(stderr, "option %s", long_options[option_index].name);
3863 if (optarg) {
3864 fprintf(stderr, " with arg %s\n", optarg);
3865 }
3866 break;
b716ce68 3867 case 'c':
fac6795d
DG		 3868 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3869 break;
3870 case 'a':
3871 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3872 break;
3873 case 'd':
3874 opt_daemon = 1;
3875 break;
3876 case 'g':
fb09408a 3877 opt_tracing_group = optarg;
fac6795d
DG		 3878 break;
3879 case 'h':
3880 usage();
3881 exit(EXIT_FAILURE);
3882 case 'V':
3883 fprintf(stdout, "%s\n", VERSION);
3884 exit(EXIT_SUCCESS);
5b8719f5
DG		 3885 case 'S':
3886 opt_sig_parent = 1;
3887 break;
d6f42150 3888 case 'E':
3bd1e081 3889 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3890 break;
3891 case 'C':
3bd1e081
MD		 3892 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3893 break;
3894 case 'F':
7753dea8 3895 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3896 break;
3897 case 'D':
7753dea8
MD		 3898 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3899 break;
3900 case 'H':
3901 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3902 break;
3903 case 'G':
3904 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3905 break;
4fba7219
DG		 3906 case 'N':
3907 opt_no_kernel = 1;
3908 break;
75462a81
DG		 3909 case 'q':
3910 opt_quiet = 1;
3911 break;
3f9947db 3912 case 'v':
53086306
DG		 3913 /* Verbose level can increase using multiple -v */
3914 opt_verbose += 1;
3f9947db 3915 break;
31f73cc9 3916 case 'Z':
3bd1e081 3917 opt_verbose_consumer += 1;
31f73cc9 3918 break;
fb09408a 3919 case 'u':
fc7a59ce 3920 consumerd32_bin= optarg;
ebaeda94
MD		 3921 break;
3922 case 'U':
3923 consumerd32_libdir = optarg;
7753dea8
MD		 3924 break;
3925 case 't':
fc7a59ce 3926 consumerd64_bin = optarg;
ebaeda94
MD		 3927 break;
3928 case 'T':
3929 consumerd64_libdir = optarg;
fb09408a 3930 break;
fac6795d
DG		 3931 default:
3932 /* Unknown option or other error.
3933 * Error is printed by getopt, just return */
3934 return -1;
3935 }
3936 }
3937
3938 return 0;
3939}
3940
3941/*
d063d709 3942 * Creates the two needed socket by the daemon.
d6f42150
DG		 3943 * apps_sock - The communication socket for all UST apps.
3944 * client_sock - The communication of the cli tool (lttng).
fac6795d 3945 */
cf3af59e 3946static int init_daemon_socket(void)
fac6795d
DG		 3947{
3948 int ret = 0;
3949 mode_t old_umask;
3950
3951 old_umask = umask(0);
3952
3953 /* Create client tool unix socket */
d6f42150
DG		 3954 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3955 if (client_sock < 0) {
3956 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3957 ret = -1;
3958 goto end;
3959 }
3960
3961 /* File permission MUST be 660 */
3962 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3963 if (ret < 0) {
d6f42150 3964 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3965 perror("chmod");
3966 goto end;
3967 }
3968
3969 /* Create the application unix socket */
d6f42150
DG		 3970 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3971 if (apps_sock < 0) {
3972 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3973 ret = -1;
3974 goto end;
3975 }
3976
d6f42150 3977 /* File permission MUST be 666 */
54d01ffb
DG		 3978 ret = chmod(apps_unix_sock_path,
3979 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3980 if (ret < 0) {
d6f42150 3981 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3982 perror("chmod");
3983 goto end;
3984 }
3985
3986end:
3987 umask(old_umask);
3988 return ret;
3989}
3990
3991/*
54d01ffb
DG		 3992 * Check if the global socket is available, and if a daemon is answering at the
3993 * other side. If yes, error is returned.
fac6795d 3994 */
cf3af59e 3995static int check_existing_daemon(void)
fac6795d 3996{
7d8234d9 3997 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3998 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3999 return 0;
099e26bd 4000 }
54d01ffb 4001
7d8234d9 4002 /* Is there anybody out there ? */
099e26bd 4003 if (lttng_session_daemon_alive()) {
7d8234d9 4004 return -EEXIST;
099e26bd 4005 } else {
7d8234d9 4006 return 0;
099e26bd 4007 }
fac6795d
DG		 4008}
4009
fac6795d 4010/*
d063d709 4011 * Set the tracing group gid onto the client socket.
5e16da05 4012 *
d063d709
DG		 4013 * Race window between mkdir and chown is OK because we are going from more
4014 * permissive (root.root) to les permissive (root.tracing).
fac6795d 4015 */
be040666 4016static int set_permissions(char *rundir)
fac6795d
DG		 4017{
4018 int ret;
996b65c8 4019 gid_t gid;
fac6795d 4020
996b65c8
MD		 4021 gid = allowed_group();
4022 if (gid < 0) {
be040666
DG		 4023 WARN("No tracing group detected");
4024 ret = 0;
fac6795d
DG		 4025 goto end;
4026 }
4027
d6f42150 4028 /* Set lttng run dir */
be040666 4029 ret = chown(rundir, 0, gid);
d6f42150 4030 if (ret < 0) {
be040666 4031 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 4032 perror("chown");
4033 }
4034
4035 /* lttng client socket path */
996b65c8 4036 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 4037 if (ret < 0) {
d6f42150
DG		 4038 ERR("Unable to set group on %s", client_unix_sock_path);
4039 perror("chown");
4040 }
4041
3bd1e081
MD		 4042 /* kconsumer error socket path */
4043 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 4044 if (ret < 0) {
3bd1e081
MD		 4045 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4046 perror("chown");
4047 }
4048
7753dea8
MD		 4049 /* 64-bit ustconsumer error socket path */
4050 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4051 if (ret < 0) {
4052 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4053 perror("chown");
4054 }
4055
4056 /* 32-bit ustconsumer compat32 error socket path */
4057 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 4058 if (ret < 0) {
7753dea8 4059 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 4060 perror("chown");
4061 }
4062
d6f42150 4063 DBG("All permissions are set");
e07ae692 4064
fac6795d
DG		 4065end:
4066 return ret;
4067}
4068
7a485870 4069/*
d063d709 4070 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 4071 */
4072static int create_kernel_poll_pipe(void)
4073{
4074 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4075}
4076
099e26bd
DG		 4077/*
4078 * Create the application command pipe to wake thread_manage_apps.
4079 */
4080static int create_apps_cmd_pipe(void)
4081{
4082 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4083}
4084
d6f42150 4085/*
d063d709 4086 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4087 */
67e40797 4088static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 4089{
4090 int ret;
4091
67e40797
DG		 4092 DBG3("Creating LTTng run directory: %s", rundir);
4093
4094 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
d6f42150 4095 if (ret < 0) {
b1f11e69 4096 if (errno != EEXIST) {
67e40797 4097 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4098 goto error;
4099 } else {
4100 ret = 0;
4101 }
d6f42150
DG		 4102 }
4103
4104error:
4105 return ret;
4106}
4107
4108/*
d063d709
DG		 4109 * Setup sockets and directory needed by the kconsumerd communication with the
4110 * session daemon.
d6f42150 4111 */
67e40797
DG		 4112static int set_consumer_sockets(struct consumer_data *consumer_data,
4113 const char *rundir)
d6f42150
DG		 4114{
4115 int ret;
67e40797 4116 char path[PATH_MAX];
d6f42150 4117
67e40797 4118 switch (consumer_data->type) {
7753dea8 4119 case LTTNG_CONSUMER_KERNEL:
67e40797 4120 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
7753dea8
MD		 4121 break;
4122 case LTTNG_CONSUMER64_UST:
67e40797 4123 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4124 break;
4125 case LTTNG_CONSUMER32_UST:
67e40797 4126 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4127 break;
4128 default:
4129 ERR("Consumer type unknown");
4130 ret = -EINVAL;
4131 goto error;
d6f42150
DG		 4132 }
4133
67e40797
DG		 4134 DBG2("Creating consumer directory: %s", path);
4135
3bd1e081 4136 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4137 if (ret < 0) {
6beb2242 4138 if (errno != EEXIST) {
3bd1e081 4139 ERR("Failed to create %s", path);
6beb2242
DG		 4140 goto error;
4141 }
4142 ret = 0;
d6f42150
DG		 4143 }
4144
4145 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4146 consumer_data->err_sock =
4147 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4148 if (consumer_data->err_sock < 0) {
4149 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4150 ret = -1;
4151 goto error;
4152 }
4153
4154 /* File permission MUST be 660 */
3bd1e081 4155 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4156 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4157 if (ret < 0) {
3bd1e081 4158 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4159 PERROR("chmod");
d6f42150
DG		 4160 goto error;
4161 }
4162
4163error:
4164 return ret;
4165}
4166
fac6795d 4167/*
d063d709 4168 * Signal handler for the daemon
cf3af59e 4169 *
54d01ffb
DG		 4170 * Simply stop all worker threads, leaving main() return gracefully after
4171 * joining all threads and calling cleanup().
fac6795d
DG		 4172 */
4173static void sighandler(int sig)
4174{
4175 switch (sig) {
cf3af59e
MD		 4176 case SIGPIPE:
4177 DBG("SIGPIPE catched");
4178 return;
4179 case SIGINT:
4180 DBG("SIGINT catched");
4181 stop_threads();
4182 break;
4183 case SIGTERM:
4184 DBG("SIGTERM catched");
4185 stop_threads();
4186 break;
4187 default:
4188 break;
fac6795d 4189 }
fac6795d
DG		 4190}
4191
4192/*
d063d709 4193 * Setup signal handler for :
1d4b027a 4194 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4195 */
1d4b027a 4196static int set_signal_handler(void)
fac6795d 4197{
1d4b027a
DG		 4198 int ret = 0;
4199 struct sigaction sa;
4200 sigset_t sigset;
fac6795d 4201
1d4b027a
DG		 4202 if ((ret = sigemptyset(&sigset)) < 0) {
4203 perror("sigemptyset");
4204 return ret;
4205 }
d6f42150 4206
1d4b027a
DG		 4207 sa.sa_handler = sighandler;
4208 sa.sa_mask = sigset;
4209 sa.sa_flags = 0;
4210 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4211 perror("sigaction");
4212 return ret;
d6f42150
DG		 4213 }
4214
1d4b027a
DG		 4215 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4216 perror("sigaction");
4217 return ret;
d6f42150 4218 }
aaf26714 4219
1d4b027a
DG		 4220 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4221 perror("sigaction");
4222 return ret;
8c0faa1d
DG		 4223 }
4224
1d4b027a
DG		 4225 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4226
4227 return ret;
fac6795d
DG		 4228}
4229
f3ed775e 4230/*
d063d709
DG		 4231 * Set open files limit to unlimited. This daemon can open a large number of
4232 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4233 */
4234static void set_ulimit(void)
4235{
4236 int ret;
4237 struct rlimit lim;
4238
a88df331 4239 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4240 lim.rlim_cur = 65535;
4241 lim.rlim_max = 65535;
4242
4243 ret = setrlimit(RLIMIT_NOFILE, &lim);
4244 if (ret < 0) {
4245 perror("failed to set open files limit");
4246 }
4247}
4248
fac6795d
DG		 4249/*
4250 * main
4251 */
4252int main(int argc, char **argv)
4253{
fac6795d
DG		 4254 int ret = 0;
4255 void *status;
b082db07 4256 const char *home_path;
fac6795d 4257
f6a9efaa
DG		 4258 rcu_register_thread();
4259
273ea72c 4260 /* Create thread quit pipe */
cf3af59e
MD		 4261 if ((ret = init_thread_quit_pipe()) < 0) {
4262 goto error;
273ea72c
DG		 4263 }
4264
7753dea8 4265 setup_consumerd_path();
fb09408a 4266
fac6795d
DG		 4267 /* Parse arguments */
4268 progname = argv[0];
4269 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4270 goto error;
fac6795d
DG		 4271 }
4272
4273 /* Daemonize */
4274 if (opt_daemon) {
53094c05
DG		 4275 ret = daemon(0, 0);
4276 if (ret < 0) {
4277 perror("daemon");
cf3af59e 4278 goto error;
53094c05 4279 }
fac6795d
DG		 4280 }
4281
4282 /* Check if daemon is UID = 0 */
4283 is_root = !getuid();
4284
fac6795d 4285 if (is_root) {
67e40797
DG		 4286 rundir = strdup(LTTNG_RUNDIR);
4287
4288 /* Create global run dir with root access */
4289 ret = create_lttng_rundir(rundir);
d6f42150 4290 if (ret < 0) {
cf3af59e 4291 goto error;
d6f42150
DG		 4292 }
4293
fac6795d 4294 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4295 snprintf(apps_unix_sock_path, PATH_MAX,
4296 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4297 }
4298
4299 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4300 snprintf(client_unix_sock_path, PATH_MAX,
4301 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4302 }
0fdd1e2c
DG		 4303
4304 /* Set global SHM for ust */
4305 if (strlen(wait_shm_path) == 0) {
4306 snprintf(wait_shm_path, PATH_MAX,
4307 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4308 }
67e40797
DG		 4309
4310 /* Setup kernel consumerd path */
4311 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4312 KCONSUMERD_ERR_SOCK_PATH, rundir);
4313 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4314 KCONSUMERD_CMD_SOCK_PATH, rundir);
4315
4316 DBG2("Kernel consumer err path: %s",
4317 kconsumer_data.err_unix_sock_path);
4318 DBG2("Kernel consumer cmd path: %s",
4319 kconsumer_data.cmd_unix_sock_path);
fac6795d 4320 } else {
b082db07
DG		 4321 home_path = get_home_dir();
4322 if (home_path == NULL) {
273ea72c
DG		 4323 /* TODO: Add --socket PATH option */
4324 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4325 ret = -EPERM;
4326 goto error;
b082db07
DG		 4327 }
4328
67e40797
DG		 4329 /*
4330 * Create rundir from home path. This will create something like
4331 * $HOME/.lttng
4332 */
4333 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4334 if (ret < 0) {
4335 ret = -ENOMEM;
4336 goto error;
4337 }
4338
4339 ret = create_lttng_rundir(rundir);
4340 if (ret < 0) {
4341 goto error;
4342 }
4343
fac6795d 4344 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4345 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4346 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4347 }
4348
4349 /* Set the cli tool unix socket path */
4350 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4351 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4352 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4353 }
0fdd1e2c
DG		 4354
4355 /* Set global SHM for ust */
4356 if (strlen(wait_shm_path) == 0) {
4357 snprintf(wait_shm_path, PATH_MAX,
4358 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4359 }
fac6795d
DG		 4360 }
4361
847177cd
DG		 4362 DBG("Client socket path %s", client_unix_sock_path);
4363 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4364 DBG("LTTng run directory path: %s", rundir);
4365
4366 /* 32 bits consumerd path setup */
4367 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4368 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4369 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4370 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4371
4372 DBG2("UST consumer 32 bits err path: %s",
4373 ustconsumer32_data.err_unix_sock_path);
4374 DBG2("UST consumer 32 bits cmd path: %s",
4375 ustconsumer32_data.cmd_unix_sock_path);
4376
4377 /* 64 bits consumerd path setup */
4378 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4379 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4380 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4381 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4382
4383 DBG2("UST consumer 64 bits err path: %s",
4384 ustconsumer64_data.err_unix_sock_path);
4385 DBG2("UST consumer 64 bits cmd path: %s",
4386 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4387
273ea72c 4388 /*
7d8234d9 4389 * See if daemon already exist.
fac6795d 4390 */
7d8234d9 4391 if ((ret = check_existing_daemon()) < 0) {
75462a81 4392 ERR("Already running daemon.\n");
273ea72c 4393 /*
cf3af59e
MD		 4394 * We do not goto exit because we must not cleanup()
4395 * because a daemon is already running.
ab118b20 4396 */
cf3af59e 4397 goto error;
a88df331
DG		 4398 }
4399
54d01ffb 4400 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4401
4402 /*
4403 * These actions must be executed as root. We do that *after* setting up
4404 * the sockets path because we MUST make the check for another daemon using
4405 * those paths *before* trying to set the kernel consumer sockets and init
4406 * kernel tracer.
4407 */
4408 if (is_root) {
67e40797 4409 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4410 if (ret < 0) {
4411 goto exit;
4412 }
4413
a88df331 4414 /* Setup kernel tracer */
4fba7219
DG		 4415 if (!opt_no_kernel) {
4416 init_kernel_tracer();
4417 }
a88df331
DG		 4418
4419 /* Set ulimit for open files */
4420 set_ulimit();
fac6795d
DG		 4421 }
4422
67e40797
DG		 4423 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4424 if (ret < 0) {
4425 goto exit;
4426 }
4427
4428 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4429 if (ret < 0) {
4430 goto exit;
4431 }
4432
cf3af59e
MD		 4433 if ((ret = set_signal_handler()) < 0) {
4434 goto exit;
fac6795d
DG		 4435 }
4436
d6f42150 4437 /* Setup the needed unix socket */
cf3af59e
MD		 4438 if ((ret = init_daemon_socket()) < 0) {
4439 goto exit;
fac6795d
DG		 4440 }
4441
4442 /* Set credentials to socket */
be040666 4443 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4444 goto exit;
fac6795d
DG		 4445 }
4446
5b8719f5
DG		 4447 /* Get parent pid if -S, --sig-parent is specified. */
4448 if (opt_sig_parent) {
4449 ppid = getppid();
4450 }
4451
7a485870 4452 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4453 if ((ret = create_kernel_poll_pipe()) < 0) {
4454 goto exit;
7a485870
DG		 4455 }
4456
099e26bd
DG		 4457 /* Setup the thread apps communication pipe. */
4458 if ((ret = create_apps_cmd_pipe()) < 0) {
4459 goto exit;
4460 }
4461
4462 /* Init UST command queue. */
4463 cds_wfq_init(&ust_cmd_queue.queue);
4464
f6a9efaa
DG		 4465 /* Init UST app hash table */
4466 ust_app_ht_alloc();
4467
273ea72c 4468 /*
54d01ffb
DG		 4469 * Get session list pointer. This pointer MUST NOT be free(). This list is
4470 * statically declared in session.c
273ea72c 4471 */
54d01ffb 4472 session_list_ptr = session_get_list();
b5541356 4473
5eb91c98
DG		 4474 /* Set up max poll set size */
4475 lttng_poll_set_max_size();
4476
cf3af59e 4477 /* Create thread to manage the client socket */
099e26bd
DG		 4478 ret = pthread_create(&client_thread, NULL,
4479 thread_manage_clients, (void *) NULL);
cf3af59e 4480 if (ret != 0) {
099e26bd 4481 perror("pthread_create clients");
cf3af59e
MD		 4482 goto exit_client;
4483 }
fac6795d 4484
099e26bd
DG		 4485 /* Create thread to dispatch registration */
4486 ret = pthread_create(&dispatch_thread, NULL,
4487 thread_dispatch_ust_registration, (void *) NULL);
4488 if (ret != 0) {
4489 perror("pthread_create dispatch");
4490 goto exit_dispatch;
4491 }
4492
4493 /* Create thread to manage application registration. */
4494 ret = pthread_create(&reg_apps_thread, NULL,
4495 thread_registration_apps, (void *) NULL);
4496 if (ret != 0) {
4497 perror("pthread_create registration");
4498 goto exit_reg_apps;
4499 }
4500
cf3af59e 4501 /* Create thread to manage application socket */
54d01ffb
DG		 4502 ret = pthread_create(&apps_thread, NULL,
4503 thread_manage_apps, (void *) NULL);
cf3af59e 4504 if (ret != 0) {
099e26bd 4505 perror("pthread_create apps");
cf3af59e
MD		 4506 goto exit_apps;
4507 }
fac6795d 4508
cf3af59e 4509 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4510 ret = pthread_create(&kernel_thread, NULL,
4511 thread_manage_kernel, (void *) NULL);
cf3af59e 4512 if (ret != 0) {
099e26bd 4513 perror("pthread_create kernel");
cf3af59e
MD		 4514 goto exit_kernel;
4515 }
7a485870 4516
cf3af59e
MD		 4517 ret = pthread_join(kernel_thread, &status);
4518 if (ret != 0) {
4519 perror("pthread_join");
4520 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4521 }
4522
cf3af59e
MD		 4523exit_kernel:
4524 ret = pthread_join(apps_thread, &status);
4525 if (ret != 0) {
4526 perror("pthread_join");
4527 goto error; /* join error, exit without cleanup */
4528 }
fac6795d 4529
cf3af59e 4530exit_apps:
099e26bd
DG		 4531 ret = pthread_join(reg_apps_thread, &status);
4532 if (ret != 0) {
4533 perror("pthread_join");
4534 goto error; /* join error, exit without cleanup */
4535 }
4536
4537exit_reg_apps:
4538 ret = pthread_join(dispatch_thread, &status);
4539 if (ret != 0) {
4540 perror("pthread_join");
4541 goto error; /* join error, exit without cleanup */
4542 }
4543
4544exit_dispatch:
cf3af59e
MD		 4545 ret = pthread_join(client_thread, &status);
4546 if (ret != 0) {
4547 perror("pthread_join");
4548 goto error; /* join error, exit without cleanup */
4549 }
4550
3bd1e081 4551 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4552 if (ret != 0) {
3bd1e081 4553 perror("join_consumer");
cf3af59e
MD		 4554 goto error; /* join error, exit without cleanup */
4555 }
a88df331 4556
cf3af59e 4557exit_client:
a88df331 4558exit:
cf3af59e
MD		 4559 /*
4560 * cleanup() is called when no other thread is running.
4561 */
f6a9efaa 4562 rcu_thread_online();
cf3af59e 4563 cleanup();
f6a9efaa
DG		 4564 rcu_thread_offline();
4565 rcu_unregister_thread();
67e40797 4566 if (!ret) {
cf3af59e 4567 exit(EXIT_SUCCESS);
67e40797 4568 }
cf3af59e 4569error:
5e16da05 4570 exit(EXIT_FAILURE);
fac6795d 4571}
LTTng 2.0 tools and control repository
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