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Fix: restart consumerd and sessiond when interrupted in poll()
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
CommitLineData
826d496d
MD		 1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG		 5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG		 9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG		 14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG		 17 */
18
19#define _GNU_SOURCE
fac6795d
DG		 20#include <getopt.h>
21#include <grp.h>
22#include <limits.h>
23#include <pthread.h>
8c0faa1d 24#include <semaphore.h>
fac6795d
DG		 25#include <signal.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
0fdd1e2c 29#include <sys/mman.h>
b73401da 30#include <sys/mount.h>
1e307fab 31#include <sys/resource.h>
fac6795d
DG		 32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/types.h>
0fdd1e2c
DG		 35#include <sys/wait.h>
36#include <urcu/futex.h>
fac6795d 37#include <unistd.h>
3bd1e081 38#include <config.h>
fac6795d 39
990570ed 40#include <common/common.h>
0ba98ebc 41#include <common/compat/poll.h>
d27c42b8 42#include <common/compat/socket.h>
db758600
DG		 43#include <common/defaults.h>
44#include <common/kernel-consumer/kernel-consumer.h>
45#include <common/ust-consumer/ust-consumer.h>
fac6795d 46
10a8a223 47#include "lttng-sessiond.h"
54d01ffb 48#include "channel.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
4771f025 52#include "kernel.h"
096102bd 53#include "modprobe.h"
0fdd1e2c 54#include "shm.h"
1e307fab 55#include "ust-ctl.h"
8e68d1c8 56#include "utils.h"
fac6795d 57
ebaeda94
MD		 58#define CONSUMERD_FILE "lttng-consumerd"
59
3bd1e081
MD		 60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 80const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD		 81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG		 89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d 92static int opt_daemon;
4fba7219 93static int opt_no_kernel;
fac6795d 94static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 95static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 96static char *rundir;
3bd1e081
MD		 97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
60922cb0
DG		 101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
7753dea8
MD		 104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
60922cb0
DG		 106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
7753dea8
MD		 108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
60922cb0
DG		 111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
DG		 117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
d6f42150
DG		 125static int client_sock;
126static int apps_sock;
20fe2104 127static int kernel_tracer_fd;
7a485870 128static int kernel_poll_pipe[2];
1d4b027a 129
273ea72c
DG		 130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134static int thread_quit_pipe[2];
135
099e26bd
DG		 136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140static int apps_cmd_pipe[2];
141
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG		 150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
b5541356
DG		 159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD		 171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
fb6f1fa2
YB		 174static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD		 178
179static
7753dea8 180void setup_consumerd_path(void)
fb09408a 181{
fc7a59ce 182 const char *bin, *libdir;
fb09408a 183
7753dea8
MD		 184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
7753dea8 188 */
ebaeda94 189#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 199 }
ebaeda94
MD		 200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 202 }
203#else
204#error "Unknown bitness"
205#endif
206
fb09408a
MD		 207 /*
208 * runtime env. var. overrides the build default.
209 */
fc7a59ce
AM		 210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
7753dea8 213 }
fc7a59ce
AM		 214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
ebaeda94 217 }
72f579ee 218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
ebaeda94
MD		 219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
72f579ee 222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD		 223 if (libdir) {
224 consumerd64_libdir = libdir;
fb09408a
MD		 225 }
226}
227
5eb91c98
DG		 228/*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233{
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254error:
255 return ret;
256}
257
258/*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263static int check_thread_quit_pipe(int fd, uint32_t events)
264{
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270}
271
0fdd1e2c
DG		 272/*
273 * Return group ID of the tracing group or -1 if not found.
274 */
996b65c8
MD		 275static gid_t allowed_group(void)
276{
277 struct group *grp;
278
274e143b
MD		 279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
996b65c8
MD		 284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289}
290
273ea72c 291/*
5eb91c98 292 * Init thread quit pipe.
273ea72c
DG		 293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296static int init_thread_quit_pipe(void)
297{
730389d9 298 int ret, i;
273ea72c 299
730389d9 300 ret = pipe(thread_quit_pipe);
273ea72c 301 if (ret < 0) {
730389d9 302 PERROR("thread quit pipe");
273ea72c
DG		 303 goto error;
304 }
305
730389d9
DG		 306 for (i = 0; i < 2; i++) {
307 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
308 if (ret < 0) {
309 PERROR("fcntl");
310 goto error;
311 }
312 }
313
273ea72c
DG		 314error:
315 return ret;
316}
317
fac6795d 318/*
d063d709
DG		 319 * Complete teardown of a kernel session. This free all data structure related
320 * to a kernel session and update counter.
fac6795d 321 */
1d4b027a 322static void teardown_kernel_session(struct ltt_session *session)
fac6795d 323{
8f7a84dd 324 if (!session->kernel_session) {
99bab54f 325 DBG3("No kernel session when tearing down session");
84ea9c99 326 return;
8f7a84dd
DG		 327 }
328
84ea9c99 329 DBG("Tearing down kernel session");
d9800920 330
84ea9c99
MD		 331 /*
332 * If a custom kernel consumer was registered, close the socket before
333 * tearing down the complete kernel session structure
334 */
335 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
336 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 337 }
84ea9c99
MD		 338
339 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 340}
341
f6a9efaa
DG		 342/*
343 * Complete teardown of all UST sessions. This will free everything on his path
344 * and destroy the core essence of all ust sessions :)
345 */
346static void teardown_ust_session(struct ltt_session *session)
347{
84cd17c6
MD		 348 int ret;
349
8f7a84dd 350 if (!session->ust_session) {
99bab54f 351 DBG3("No UST session when tearing down session");
f470a390 352 return;
8f7a84dd
DG		 353 }
354
84ea9c99 355 DBG("Tearing down UST session(s)");
8f7a84dd 356
84cd17c6
MD		 357 ret = ust_app_destroy_trace_all(session->ust_session);
358 if (ret) {
359 ERR("Error in ust_app_destroy_trace_all");
360 }
8f7a84dd 361
f6a9efaa
DG		 362 trace_ust_destroy_session(session->ust_session);
363}
364
099e26bd
DG		 365/*
366 * Stop all threads by closing the thread quit pipe.
367 */
cf3af59e
MD		 368static void stop_threads(void)
369{
5eb91c98
DG		 370 int ret;
371
cf3af59e
MD		 372 /* Stopping all threads */
373 DBG("Terminating all threads");
54d01ffb 374 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 375 if (ret < 0) {
376 ERR("write error on thread quit pipe");
377 }
378
099e26bd
DG		 379 /* Dispatch thread */
380 dispatch_thread_exit = 1;
381 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 382}
383
fac6795d 384/*
d063d709 385 * Cleanup the daemon
fac6795d 386 */
cf3af59e 387static void cleanup(void)
fac6795d 388{
1d4b027a
DG		 389 int ret;
390 char *cmd;
af9737e9 391 struct ltt_session *sess, *stmp;
fac6795d 392
1d4b027a 393 DBG("Cleaning up");
e07ae692 394
67e40797
DG		 395 DBG("Removing %s directory", rundir);
396 ret = asprintf(&cmd, "rm -rf %s", rundir);
397 if (ret < 0) {
398 ERR("asprintf failed. Something is really wrong!");
399 }
5461b305 400
67e40797
DG		 401 /* Remove lttng run directory */
402 ret = system(cmd);
403 if (ret < 0) {
404 ERR("Unable to clean %s", rundir);
1d4b027a 405 }
67e40797 406 free(cmd);
5461b305 407
99bab54f 408 DBG("Cleaning up all sessions");
fac6795d 409
b5541356 410 /* Destroy session list mutex */
273ea72c
DG		 411 if (session_list_ptr != NULL) {
412 pthread_mutex_destroy(&session_list_ptr->lock);
413
414 /* Cleanup ALL session */
54d01ffb
DG		 415 cds_list_for_each_entry_safe(sess, stmp,
416 &session_list_ptr->head, list) {
273ea72c 417 teardown_kernel_session(sess);
f6a9efaa
DG		 418 teardown_ust_session(sess);
419 free(sess);
273ea72c
DG		 420 }
421 }
422
099e26bd 423 DBG("Closing all UST sockets");
56fff090 424 ust_app_clean_list();
099e26bd 425
3bd1e081 426 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 427
4fba7219
DG		 428 if (is_root && !opt_no_kernel) {
429 DBG2("Closing kernel fd");
430 close(kernel_tracer_fd);
2f50c8a3 431 DBG("Unloading kernel modules");
096102bd 432 modprobe_remove_lttng_all();
2f50c8a3 433 }
5eb91c98
DG		 434
435 close(thread_quit_pipe[0]);
436 close(thread_quit_pipe[1]);
421cb601
DG		 437
438 /* <fun> */
f56a39af 439 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG		 440 "Matthew, BEET driven development works!%c[%dm",
441 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
442 /* </fun> */
fac6795d
DG		 443}
444
e065084a 445/*
d063d709 446 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 447 *
d063d709 448 * Return lttcomm error code.
e065084a
DG		 449 */
450static int send_unix_sock(int sock, void *buf, size_t len)
451{
452 /* Check valid length */
453 if (len <= 0) {
454 return -1;
455 }
456
457 return lttcomm_send_unix_sock(sock, buf, len);
458}
459
5461b305 460/*
d063d709 461 * Free memory of a command context structure.
5461b305 462 */
a2fb29a5 463static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 464{
a2fb29a5
DG		 465 DBG("Clean command context structure");
466 if (*cmd_ctx) {
467 if ((*cmd_ctx)->llm) {
468 free((*cmd_ctx)->llm);
5461b305 469 }
a2fb29a5
DG		 470 if ((*cmd_ctx)->lsm) {
471 free((*cmd_ctx)->lsm);
5461b305 472 }
a2fb29a5
DG		 473 free(*cmd_ctx);
474 *cmd_ctx = NULL;
5461b305
DG		 475 }
476}
477
f3ed775e 478/*
d063d709 479 * Send all stream fds of kernel channel to the consumer.
f3ed775e 480 */
2bdd86d4 481static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD		 482 int sock, struct ltt_kernel_channel *channel,
483 uid_t uid, gid_t gid)
f3ed775e
DG		 484{
485 int ret;
f3ed775e 486 struct ltt_kernel_stream *stream;
3bd1e081 487 struct lttcomm_consumer_msg lkm;
f3ed775e 488
3bd1e081 489 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 490 channel->channel->name);
f3ed775e 491
3bd1e081
MD		 492 /* Send channel */
493 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
494 lkm.u.channel.channel_key = channel->fd;
495 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
496 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 497 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 498 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 499 if (ret < 0) {
3bd1e081 500 perror("send consumer channel");
f3ed775e
DG		 501 goto error;
502 }
503
3bd1e081 504 /* Send streams */
7a485870 505 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 506 if (!stream->fd) {
507 continue;
508 }
509 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
510 lkm.u.stream.channel_key = channel->fd;
511 lkm.u.stream.stream_key = stream->fd;
512 lkm.u.stream.state = stream->state;
513 lkm.u.stream.output = channel->channel->attr.output;
514 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 515 lkm.u.stream.uid = uid;
516 lkm.u.stream.gid = gid;
3bd1e081
MD		 517 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
518 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
519 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
520 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
521 if (ret < 0) {
522 perror("send consumer stream");
523 goto error;
524 }
525 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
526 if (ret < 0) {
527 perror("send consumer stream ancillary data");
528 goto error;
f3ed775e
DG		 529 }
530 }
531
3bd1e081 532 DBG("consumer channel streams sent");
f3ed775e
DG		 533
534 return 0;
535
536error:
537 return ret;
538}
539
540/*
d063d709 541 * Send all stream fds of the kernel session to the consumer.
f3ed775e 542 */
2bdd86d4 543static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 544 struct ltt_kernel_session *session)
f3ed775e
DG		 545{
546 int ret;
547 struct ltt_kernel_channel *chan;
3bd1e081
MD		 548 struct lttcomm_consumer_msg lkm;
549 int sock = session->consumer_fd;
7a485870
DG		 550
551 DBG("Sending metadata stream fd");
552
2bdd86d4 553 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 554 if (session->consumer_fd == 0) {
3bd1e081 555 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 556 }
557
7a485870 558 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 559 /* Send metadata channel fd */
560 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
561 lkm.u.channel.channel_key = session->metadata->fd;
562 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
563 lkm.u.channel.mmap_len = 0; /* for kernel */
564 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
565 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
566 if (ret < 0) {
567 perror("send consumer channel");
568 goto error;
569 }
570
571 /* Send metadata stream fd */
572 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
573 lkm.u.stream.channel_key = session->metadata->fd;
574 lkm.u.stream.stream_key = session->metadata_stream_fd;
575 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
576 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
577 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 578 lkm.u.stream.uid = session->uid;
579 lkm.u.stream.gid = session->gid;
3bd1e081
MD		 580 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
581 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
582 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
583 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
584 if (ret < 0) {
585 perror("send consumer stream");
586 goto error;
587 }
588 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 589 if (ret < 0) {
3bd1e081 590 perror("send consumer stream");
7a485870
DG		 591 goto error;
592 }
593 }
f3ed775e 594
f3ed775e 595 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD		 596 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
597 session->uid, session->gid);
2bdd86d4
MD		 598 if (ret < 0) {
599 goto error;
600 }
601 }
602
603 DBG("consumer fds (metadata and channel streams) sent");
604
605 return 0;
606
607error:
608 return ret;
609}
610
fac6795d 611/*
0fdd1e2c 612 * Notify UST applications using the shm mmap futex.
fac6795d 613 */
0fdd1e2c 614static int notify_ust_apps(int active)
fac6795d 615{
0fdd1e2c 616 char *wait_shm_mmap;
fac6795d 617
0fdd1e2c 618 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 619
0fdd1e2c
DG		 620 /* See shm.c for this call implying mmap, shm and futex calls */
621 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
622 if (wait_shm_mmap == NULL) {
fac6795d
DG		 623 goto error;
624 }
625
0fdd1e2c
DG		 626 /* Wake waiting process */
627 futex_wait_update((int32_t *) wait_shm_mmap, active);
628
629 /* Apps notified successfully */
630 return 0;
fac6795d
DG		 631
632error:
0fdd1e2c 633 return -1;
fac6795d
DG		 634}
635
e065084a 636/*
d063d709
DG		 637 * Setup the outgoing data buffer for the response (llm) by allocating the
638 * right amount of memory and copying the original information from the lsm
639 * structure.
ca95a216 640 *
d063d709 641 * Return total size of the buffer pointed by buf.
ca95a216 642 */
5461b305 643static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 644{
f3ed775e 645 int ret, buf_size;
ca95a216 646
f3ed775e 647 buf_size = size;
5461b305 648
ba7f0ae5 649 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 650 if (cmd_ctx->llm == NULL) {
ba7f0ae5 651 perror("zmalloc");
5461b305 652 ret = -ENOMEM;
ca95a216
DG		 653 goto error;
654 }
655
5461b305
DG		 656 /* Copy common data */
657 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 658 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 659
5461b305
DG		 660 cmd_ctx->llm->data_size = size;
661 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
662
ca95a216
DG		 663 return buf_size;
664
665error:
666 return ret;
667}
668
7a485870 669/*
5eb91c98 670 * Update the kernel poll set of all channel fd available over all tracing
d063d709 671 * session. Add the wakeup pipe at the end of the set.
7a485870 672 */
5eb91c98 673static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 674{
5eb91c98 675 int ret;
7a485870
DG		 676 struct ltt_session *session;
677 struct ltt_kernel_channel *channel;
678
5eb91c98 679 DBG("Updating kernel poll set");
7a485870 680
54d01ffb 681 session_lock_list();
b5541356 682 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 683 session_lock(session);
7a485870 684 if (session->kernel_session == NULL) {
54d01ffb 685 session_unlock(session);
7a485870
DG		 686 continue;
687 }
7a485870 688
54d01ffb
DG		 689 cds_list_for_each_entry(channel,
690 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 691 /* Add channel fd to the kernel poll set */
692 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
693 if (ret < 0) {
54d01ffb 694 session_unlock(session);
5eb91c98
DG		 695 goto error;
696 }
697 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 698 }
54d01ffb 699 session_unlock(session);
7a485870 700 }
54d01ffb 701 session_unlock_list();
7a485870 702
5eb91c98 703 return 0;
7a485870
DG		 704
705error:
54d01ffb 706 session_unlock_list();
7a485870
DG		 707 return -1;
708}
709
710/*
54d01ffb 711 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 712 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 713 *
d063d709 714 * Useful for CPU hotplug feature.
7a485870 715 */
2bdd86d4 716static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 717{
718 int ret = 0;
719 struct ltt_session *session;
720 struct ltt_kernel_channel *channel;
721
722 DBG("Updating kernel streams for channel fd %d", fd);
723
54d01ffb 724 session_lock_list();
b5541356 725 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 726 session_lock(session);
7a485870 727 if (session->kernel_session == NULL) {
54d01ffb 728 session_unlock(session);
7a485870
DG		 729 continue;
730 }
d9800920
DG		 731
732 /* This is not suppose to be 0 but this is an extra security check */
733 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 734 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 735 }
736
5eb91c98
DG		 737 cds_list_for_each_entry(channel,
738 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 739 if (channel->fd == fd) {
740 DBG("Channel found, updating kernel streams");
741 ret = kernel_open_channel_stream(channel);
742 if (ret < 0) {
b3c750d2 743 goto error;
7a485870 744 }
d9800920 745
7a485870 746 /*
5eb91c98
DG		 747 * Have we already sent fds to the consumer? If yes, it means
748 * that tracing is started so it is safe to send our updated
749 * stream fds.
7a485870 750 */
3bd1e081 751 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 752 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD		 753 session->kernel_session->consumer_fd, channel,
754 session->uid, session->gid);
7a485870 755 if (ret < 0) {
b3c750d2 756 goto error;
7a485870
DG		 757 }
758 }
b3c750d2 759 goto error;
7a485870
DG		 760 }
761 }
54d01ffb 762 session_unlock(session);
7a485870 763 }
54d01ffb 764 session_unlock_list();
b3c750d2 765 return ret;
7a485870 766
b3c750d2 767error:
54d01ffb
DG		 768 session_unlock(session);
769 session_unlock_list();
7a485870
DG		 770 return ret;
771}
772
487cf67c
DG		 773/*
774 * For each tracing session, update newly registered apps.
775 */
776static void update_ust_app(int app_sock)
777{
778 struct ltt_session *sess, *stmp;
779
4ee14516
DG		 780 session_lock_list();
781
487cf67c
DG		 782 /* For all tracing session(s) */
783 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 784 session_lock(sess);
421cb601
DG		 785 if (sess->ust_session) {
786 ust_app_global_update(sess->ust_session, app_sock);
787 }
4ee14516 788 session_unlock(sess);
487cf67c 789 }
4ee14516
DG		 790
791 session_unlock_list();
487cf67c
DG		 792}
793
7a485870 794/*
d063d709 795 * This thread manage event coming from the kernel.
7a485870 796 *
d063d709
DG		 797 * Features supported in this thread:
798 * -) CPU Hotplug
7a485870
DG		 799 */
800static void *thread_manage_kernel(void *data)
801{
5eb91c98
DG		 802 int ret, i, pollfd, update_poll_flag = 1;
803 uint32_t revents, nb_fd;
7a485870 804 char tmp;
5eb91c98 805 struct lttng_poll_event events;
7a485870
DG		 806
807 DBG("Thread manage kernel started");
808
5eb91c98
DG		 809 ret = create_thread_poll_set(&events, 2);
810 if (ret < 0) {
811 goto error;
812 }
813
814 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
815 if (ret < 0) {
816 goto error;
817 }
818
7a485870
DG		 819 while (1) {
820 if (update_poll_flag == 1) {
5f822d0a
DG		 821 /*
822 * Reset number of fd in the poll set. Always 2 since there is the thread
823 * quit pipe and the kernel pipe.
824 */
825 events.nb_fd = 2;
826
5eb91c98
DG		 827 ret = update_kernel_poll(&events);
828 if (ret < 0) {
7a485870
DG		 829 goto error;
830 }
831 update_poll_flag = 0;
832 }
833
5eb91c98
DG		 834 nb_fd = LTTNG_POLL_GETNB(&events);
835
836 DBG("Thread kernel polling on %d fds", nb_fd);
837
838 /* Zeroed the poll events */
839 lttng_poll_reset(&events);
7a485870
DG		 840
841 /* Poll infinite value of time */
88f2b785 842 restart:
5eb91c98 843 ret = lttng_poll_wait(&events, -1);
7a485870 844 if (ret < 0) {
88f2b785
MD		 845 /*
846 * Restart interrupted system call.
847 */
848 if (errno == EINTR) {
849 goto restart;
850 }
7a485870
DG		 851 goto error;
852 } else if (ret == 0) {
853 /* Should not happen since timeout is infinite */
85611738
DG		 854 ERR("Return value of poll is 0 with an infinite timeout.\n"
855 "This should not have happened! Continuing...");
7a485870
DG		 856 continue;
857 }
858
5eb91c98
DG		 859 for (i = 0; i < nb_fd; i++) {
860 /* Fetch once the poll data */
861 revents = LTTNG_POLL_GETEV(&events, i);
862 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 863
5eb91c98
DG		 864 /* Thread quit pipe has been closed. Killing thread. */
865 ret = check_thread_quit_pipe(pollfd, revents);
866 if (ret) {
867 goto error;
868 }
7a485870 869
5eb91c98
DG		 870 /* Check for data on kernel pipe */
871 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
872 ret = read(kernel_poll_pipe[0], &tmp, 1);
873 update_poll_flag = 1;
874 continue;
875 } else {
876 /*
877 * New CPU detected by the kernel. Adding kernel stream to
878 * kernel session and updating the kernel consumer
879 */
880 if (revents & LPOLLIN) {
2bdd86d4 881 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 882 if (ret < 0) {
883 continue;
884 }
885 break;
886 /*
887 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
888 * and unregister kernel stream at this point.
889 */
7a485870 890 }
7a485870
DG		 891 }
892 }
893 }
894
895error:
896 DBG("Kernel thread dying");
273ea72c
DG		 897 close(kernel_poll_pipe[0]);
898 close(kernel_poll_pipe[1]);
5eb91c98
DG		 899
900 lttng_poll_clean(&events);
901
7a485870
DG		 902 return NULL;
903}
904
1d4b027a 905/*
3bd1e081 906 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 907 */
3bd1e081 908static void *thread_manage_consumer(void *data)
1d4b027a 909{
5eb91c98
DG		 910 int sock = 0, i, ret, pollfd;
911 uint32_t revents, nb_fd;
1d4b027a 912 enum lttcomm_return_code code;
5eb91c98 913 struct lttng_poll_event events;
3bd1e081 914 struct consumer_data *consumer_data = data;
1d4b027a 915
3bd1e081 916 DBG("[thread] Manage consumer started");
1d4b027a 917
3bd1e081 918 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 919 if (ret < 0) {
920 goto error;
921 }
922
5eb91c98
DG		 923 /*
924 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
925 * Nothing more will be added to this poll set.
926 */
927 ret = create_thread_poll_set(&events, 2);
928 if (ret < 0) {
929 goto error;
930 }
273ea72c 931
3bd1e081 932 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 933 if (ret < 0) {
934 goto error;
935 }
936
937 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 938
939 /* Inifinite blocking call, waiting for transmission */
88f2b785 940restart:
5eb91c98 941 ret = lttng_poll_wait(&events, -1);
273ea72c 942 if (ret < 0) {
88f2b785
MD		 943 /*
944 * Restart interrupted system call.
945 */
946 if (errno == EINTR) {
947 goto restart;
948 }
273ea72c
DG		 949 goto error;
950 }
951
5eb91c98
DG		 952 for (i = 0; i < nb_fd; i++) {
953 /* Fetch once the poll data */
954 revents = LTTNG_POLL_GETEV(&events, i);
955 pollfd = LTTNG_POLL_GETFD(&events, i);
956
957 /* Thread quit pipe has been closed. Killing thread. */
958 ret = check_thread_quit_pipe(pollfd, revents);
959 if (ret) {
960 goto error;
961 }
962
963 /* Event on the registration socket */
3bd1e081 964 if (pollfd == consumer_data->err_sock) {
5eb91c98 965 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 966 ERR("consumer err socket poll error");
5eb91c98
DG		 967 goto error;
968 }
969 }
273ea72c
DG		 970 }
971
3bd1e081 972 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 973 if (sock < 0) {
974 goto error;
975 }
976
3bd1e081 977 DBG2("Receiving code from consumer err_sock");
ee0b0061 978
712ea556 979 /* Getting status code from kconsumerd */
54d01ffb
DG		 980 ret = lttcomm_recv_unix_sock(sock, &code,
981 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 982 if (ret <= 0) {
983 goto error;
984 }
985
3bd1e081
MD		 986 if (code == CONSUMERD_COMMAND_SOCK_READY) {
987 consumer_data->cmd_sock =
988 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
989 if (consumer_data->cmd_sock < 0) {
990 sem_post(&consumer_data->sem);
48842b30 991 PERROR("consumer connect");
1d4b027a
DG		 992 goto error;
993 }
994 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 995 sem_post(&consumer_data->sem);
996 DBG("consumer command socket ready");
1d4b027a 997 } else {
3bd1e081 998 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 999 lttcomm_get_readable_code(-code));
1000 goto error;
1001 }
1002
54d01ffb 1003 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1004 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1005 if (ret < 0) {
72079cae
DG		 1006 goto error;
1007 }
1008
5eb91c98
DG		 1009 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1010 if (ret < 0) {
72079cae 1011 goto error;
5eb91c98
DG		 1012 }
1013
1014 /* Update number of fd */
1015 nb_fd = LTTNG_POLL_GETNB(&events);
1016
1017 /* Inifinite blocking call, waiting for transmission */
88f2b785 1018restart_poll:
5eb91c98
DG		 1019 ret = lttng_poll_wait(&events, -1);
1020 if (ret < 0) {
88f2b785
MD		 1021 /*
1022 * Restart interrupted system call.
1023 */
1024 if (errno == EINTR) {
1025 goto restart_poll;
1026 }
72079cae
DG		 1027 goto error;
1028 }
1029
5eb91c98
DG		 1030 for (i = 0; i < nb_fd; i++) {
1031 /* Fetch once the poll data */
1032 revents = LTTNG_POLL_GETEV(&events, i);
1033 pollfd = LTTNG_POLL_GETFD(&events, i);
1034
1035 /* Thread quit pipe has been closed. Killing thread. */
1036 ret = check_thread_quit_pipe(pollfd, revents);
1037 if (ret) {
1038 goto error;
1039 }
1040
1041 /* Event on the kconsumerd socket */
1042 if (pollfd == sock) {
1043 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1044 ERR("consumer err socket second poll error");
5eb91c98
DG		 1045 goto error;
1046 }
1047 }
1048 }
1049
712ea556 1050 /* Wait for any kconsumerd error */
54d01ffb
DG		 1051 ret = lttcomm_recv_unix_sock(sock, &code,
1052 sizeof(enum lttcomm_return_code));
712ea556 1053 if (ret <= 0) {
3bd1e081 1054 ERR("consumer closed the command socket");
712ea556 1055 goto error;
6f61d021 1056 }
1d4b027a 1057
3bd1e081 1058 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1059
1d4b027a 1060error:
3bd1e081
MD		 1061 DBG("consumer thread dying");
1062 close(consumer_data->err_sock);
1063 close(consumer_data->cmd_sock);
5eb91c98 1064 close(sock);
273ea72c 1065
3bd1e081
MD		 1066 unlink(consumer_data->err_unix_sock_path);
1067 unlink(consumer_data->cmd_unix_sock_path);
1068 consumer_data->pid = 0;
1d4b027a 1069
5eb91c98 1070 lttng_poll_clean(&events);
0177d773 1071
5eb91c98 1072 return NULL;
099e26bd
DG		 1073}
1074
099e26bd
DG		 1075/*
1076 * This thread manage application communication.
1d4b027a
DG		 1077 */
1078static void *thread_manage_apps(void *data)
099e26bd 1079{
5eb91c98
DG		 1080 int i, ret, pollfd;
1081 uint32_t revents, nb_fd;
099e26bd 1082 struct ust_command ust_cmd;
5eb91c98 1083 struct lttng_poll_event events;
099e26bd
DG		 1084
1085 DBG("[thread] Manage application started");
1086
f6a9efaa
DG		 1087 rcu_register_thread();
1088 rcu_thread_online();
1089
5eb91c98
DG		 1090 ret = create_thread_poll_set(&events, 2);
1091 if (ret < 0) {
1092 goto error;
1093 }
099e26bd 1094
5eb91c98
DG		 1095 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1096 if (ret < 0) {
1097 goto error;
1098 }
099e26bd 1099
5eb91c98
DG		 1100 while (1) {
1101 /* Zeroed the events structure */
1102 lttng_poll_reset(&events);
0177d773 1103
5eb91c98 1104 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1105
1106 DBG("Apps thread polling on %d fds", nb_fd);
1107
1108 /* Inifinite blocking call, waiting for transmission */
88f2b785 1109 restart:
5eb91c98 1110 ret = lttng_poll_wait(&events, -1);
099e26bd 1111 if (ret < 0) {
88f2b785
MD		 1112 /*
1113 * Restart interrupted system call.
1114 */
1115 if (errno == EINTR) {
1116 goto restart;
1117 }
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 1154 /*
e0c7ec2b 1155 * Validate UST version compatibility.
acc7b41b 1156 */
e0c7ec2b
DG		 1157 ret = ust_app_validate_version(ust_cmd.sock);
1158 if (ret >= 0) {
1159 /*
1160 * Add channel(s) and event(s) to newly registered apps
1161 * from lttng global UST domain.
1162 */
1163 update_ust_app(ust_cmd.sock);
1164 }
acc7b41b 1165
f2ca2e25 1166 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG		 1167 if (ret < 0) {
1168 /*
1169 * If the registration is not possible, we simply
1170 * unregister the apps and continue
1171 */
56fff090 1172 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1173 } else {
1174 /*
1175 * We just need here to monitor the close of the UST
1176 * socket and poll set monitor those by default.
1177 */
1178 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1179 if (ret < 0) {
1180 goto error;
1181 }
1182
54d01ffb
DG		 1183 DBG("Apps with sock %d added to poll set",
1184 ust_cmd.sock);
5eb91c98 1185 }
487cf67c 1186
5eb91c98 1187 break;
0177d773 1188 }
5eb91c98
DG		 1189 } else {
1190 /*
54d01ffb
DG		 1191 * At this point, we know that a registered application made
1192 * the event at poll_wait.
5eb91c98
DG		 1193 */
1194 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1195 /* Removing from the poll set */
1196 ret = lttng_poll_del(&events, pollfd);
1197 if (ret < 0) {
1198 goto error;
1199 }
099e26bd 1200
b9d9b220 1201 /* Socket closed on remote end. */
56fff090 1202 ust_app_unregister(pollfd);
5eb91c98
DG		 1203 break;
1204 }
099e26bd
DG		 1205 }
1206 }
099e26bd
DG		 1207 }
1208
1209error:
1210 DBG("Application communication apps dying");
1211 close(apps_cmd_pipe[0]);
1212 close(apps_cmd_pipe[1]);
1213
5eb91c98 1214 lttng_poll_clean(&events);
099e26bd 1215
f6a9efaa
DG		 1216 rcu_thread_offline();
1217 rcu_unregister_thread();
099e26bd
DG		 1218 return NULL;
1219}
1220
1221/*
1222 * Dispatch request from the registration threads to the application
1223 * communication thread.
1224 */
1225static void *thread_dispatch_ust_registration(void *data)
1226{
1227 int ret;
1228 struct cds_wfq_node *node;
1229 struct ust_command *ust_cmd = NULL;
1230
1231 DBG("[thread] Dispatch UST command started");
1232
1233 while (!dispatch_thread_exit) {
1234 /* Atomically prepare the queue futex */
1235 futex_nto1_prepare(&ust_cmd_queue.futex);
1236
1237 do {
1238 /* Dequeue command for registration */
1239 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1240 if (node == NULL) {
00a17c97 1241 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1242 /* Continue thread execution */
1243 break;
1244 }
1245
1246 ust_cmd = caa_container_of(node, struct ust_command, node);
1247
2f50c8a3
DG		 1248 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1249 " gid:%d sock:%d name:%s (version %d.%d)",
1250 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1251 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1252 ust_cmd->sock, ust_cmd->reg_msg.name,
1253 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1254 /*
1255 * Inform apps thread of the new application registration. This
1256 * call is blocking so we can be assured that the data will be read
1257 * at some point in time or wait to the end of the world :)
1258 */
1259 ret = write(apps_cmd_pipe[1], ust_cmd,
1260 sizeof(struct ust_command));
1261 if (ret < 0) {
1262 perror("write apps cmd pipe");
1263 if (errno == EBADF) {
1264 /*
1265 * We can't inform the application thread to process
1266 * registration. We will exit or else application
1267 * registration will not occur and tracing will never
1268 * start.
1269 */
1270 goto error;
1271 }
1272 }
1273 free(ust_cmd);
1274 } while (node != NULL);
1275
1276 /* Futex wait on queue. Blocking call on futex() */
1277 futex_nto1_wait(&ust_cmd_queue.futex);
1278 }
1279
1280error:
1281 DBG("Dispatch thread dying");
1282 return NULL;
1283}
1284
1285/*
1286 * This thread manage application registration.
1287 */
1288static void *thread_registration_apps(void *data)
1d4b027a 1289{
5eb91c98
DG		 1290 int sock = 0, i, ret, pollfd;
1291 uint32_t revents, nb_fd;
1292 struct lttng_poll_event events;
099e26bd
DG		 1293 /*
1294 * Get allocated in this thread, enqueued to a global queue, dequeued and
1295 * freed in the manage apps thread.
1296 */
1297 struct ust_command *ust_cmd = NULL;
1d4b027a 1298
099e26bd 1299 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1300
1301 ret = lttcomm_listen_unix_sock(apps_sock);
1302 if (ret < 0) {
1303 goto error;
1304 }
1305
5eb91c98
DG		 1306 /*
1307 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1308 * more will be added to this poll set.
1309 */
1310 ret = create_thread_poll_set(&events, 2);
1311 if (ret < 0) {
1312 goto error;
1313 }
273ea72c 1314
5eb91c98
DG		 1315 /* Add the application registration socket */
1316 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1317 if (ret < 0) {
1318 goto error;
1319 }
273ea72c 1320
1d4b027a 1321 /* Notify all applications to register */
0fdd1e2c
DG		 1322 ret = notify_ust_apps(1);
1323 if (ret < 0) {
1324 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1325 "Execution continues but there might be problem for already\n"
1326 "running applications that wishes to register.");
0fdd1e2c 1327 }
1d4b027a
DG		 1328
1329 while (1) {
1330 DBG("Accepting application registration");
273ea72c 1331
5eb91c98
DG		 1332 nb_fd = LTTNG_POLL_GETNB(&events);
1333
273ea72c 1334 /* Inifinite blocking call, waiting for transmission */
88f2b785 1335 restart:
5eb91c98 1336 ret = lttng_poll_wait(&events, -1);
273ea72c 1337 if (ret < 0) {
88f2b785
MD		 1338 /*
1339 * Restart interrupted system call.
1340 */
1341 if (errno == EINTR) {
1342 goto restart;
1343 }
273ea72c
DG		 1344 goto error;
1345 }
1346
5eb91c98
DG		 1347 for (i = 0; i < nb_fd; i++) {
1348 /* Fetch once the poll data */
1349 revents = LTTNG_POLL_GETEV(&events, i);
1350 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1351
5eb91c98
DG		 1352 /* Thread quit pipe has been closed. Killing thread. */
1353 ret = check_thread_quit_pipe(pollfd, revents);
1354 if (ret) {
90014c57
DG		 1355 goto error;
1356 }
1d4b027a 1357
5eb91c98
DG		 1358 /* Event on the registration socket */
1359 if (pollfd == apps_sock) {
1360 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1361 ERR("Register apps socket poll error");
1362 goto error;
1363 } else if (revents & LPOLLIN) {
1364 sock = lttcomm_accept_unix_sock(apps_sock);
1365 if (sock < 0) {
1366 goto error;
1367 }
099e26bd 1368
5eb91c98 1369 /* Create UST registration command for enqueuing */
ba7f0ae5 1370 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1371 if (ust_cmd == NULL) {
ba7f0ae5 1372 perror("ust command zmalloc");
5eb91c98
DG		 1373 goto error;
1374 }
1d4b027a 1375
5eb91c98
DG		 1376 /*
1377 * Using message-based transmissions to ensure we don't
1378 * have to deal with partially received messages.
1379 */
1380 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1381 sizeof(struct ust_register_msg));
1382 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1383 if (ret < 0) {
1384 perror("lttcomm_recv_unix_sock register apps");
1385 } else {
1386 ERR("Wrong size received on apps register");
1387 }
1388 free(ust_cmd);
1389 close(sock);
1390 continue;
1391 }
099e26bd 1392
5eb91c98 1393 ust_cmd->sock = sock;
099e26bd 1394
5eb91c98
DG		 1395 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1396 " gid:%d sock:%d name:%s (version %d.%d)",
1397 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1398 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1399 ust_cmd->sock, ust_cmd->reg_msg.name,
1400 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1401
5eb91c98
DG		 1402 /*
1403 * Lock free enqueue the registration request. The red pill
54d01ffb 1404 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1405 */
1406 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1407
1408 /*
1409 * Wake the registration queue futex. Implicit memory
1410 * barrier with the exchange in cds_wfq_enqueue.
1411 */
1412 futex_nto1_wake(&ust_cmd_queue.futex);
1413 }
1414 }
90014c57 1415 }
1d4b027a
DG		 1416 }
1417
1418error:
0fdd1e2c
DG		 1419 DBG("UST Registration thread dying");
1420
1421 /* Notify that the registration thread is gone */
1422 notify_ust_apps(0);
1423
1424 close(apps_sock);
1425 close(sock);
273ea72c 1426 unlink(apps_unix_sock_path);
0fdd1e2c 1427
5eb91c98
DG		 1428 lttng_poll_clean(&events);
1429
1d4b027a
DG		 1430 return NULL;
1431}
1432
8c0faa1d 1433/*
3bd1e081 1434 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1435 * exec or it will fails.
8c0faa1d 1436 */
3bd1e081 1437static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1438{
1439 int ret;
ee0b0061
DG		 1440 struct timespec timeout;
1441
1442 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1443 timeout.tv_nsec = 0;
8c0faa1d
DG		 1444
1445 /* Setup semaphore */
3bd1e081 1446 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1447 if (ret < 0) {
3bd1e081 1448 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1449 goto error;
1450 }
8c0faa1d 1451
3bd1e081
MD		 1452 ret = pthread_create(&consumer_data->thread, NULL,
1453 thread_manage_consumer, consumer_data);
8c0faa1d 1454 if (ret != 0) {
3bd1e081 1455 PERROR("pthread_create consumer");
ee0b0061 1456 ret = -1;
8c0faa1d
DG		 1457 goto error;
1458 }
1459
ee0b0061
DG		 1460 /* Get time for sem_timedwait absolute timeout */
1461 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1462 if (ret < 0) {
3bd1e081 1463 PERROR("clock_gettime spawn consumer");
ee0b0061 1464 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1465 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1466 } else {
1467 /* Normal timeout if the gettime was successful */
1468 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1469 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1470 }
8c0faa1d 1471
ee0b0061
DG		 1472 if (ret < 0) {
1473 if (errno == ETIMEDOUT) {
1474 /*
1475 * Call has timed out so we kill the kconsumerd_thread and return
1476 * an error.
1477 */
3bd1e081
MD		 1478 ERR("The consumer thread was never ready. Killing it");
1479 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1480 if (ret < 0) {
3bd1e081 1481 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1482 }
1483 } else {
3bd1e081 1484 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1485 }
1486 goto error;
1487 }
1488
3bd1e081
MD		 1489 pthread_mutex_lock(&consumer_data->pid_mutex);
1490 if (consumer_data->pid == 0) {
712ea556 1491 ERR("Kconsumerd did not start");
3bd1e081 1492 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1493 goto error;
1494 }
3bd1e081 1495 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1496
8c0faa1d
DG		 1497 return 0;
1498
1499error:
1500 return ret;
1501}
1502
d9800920 1503/*
3bd1e081 1504 * Join consumer thread
d9800920 1505 */
3bd1e081 1506static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1507{
1508 void *status;
1509 int ret;
1510
3bd1e081
MD		 1511 if (consumer_data->pid != 0) {
1512 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1513 if (ret) {
3bd1e081 1514 ERR("Error killing consumer daemon");
cf3af59e
MD		 1515 return ret;
1516 }
3bd1e081 1517 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1518 } else {
1519 return 0;
1520 }
1521}
1522
8c0faa1d 1523/*
3bd1e081 1524 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1525 *
d063d709 1526 * Return pid if successful else -1.
8c0faa1d 1527 */
3bd1e081 1528static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1529{
1530 int ret;
1531 pid_t pid;
94c55f17 1532 const char *consumer_to_use;
53086306 1533 const char *verbosity;
94c55f17 1534 struct stat st;
8c0faa1d 1535
3bd1e081 1536 DBG("Spawning consumerd");
c49dc785 1537
8c0faa1d
DG		 1538 pid = fork();
1539 if (pid == 0) {
1540 /*
3bd1e081 1541 * Exec consumerd.
8c0faa1d 1542 */
daee5345 1543 if (opt_verbose_consumer) {
53086306
DG		 1544 verbosity = "--verbose";
1545 } else {
1546 verbosity = "--quiet";
1547 }
3bd1e081
MD		 1548 switch (consumer_data->type) {
1549 case LTTNG_CONSUMER_KERNEL:
94c55f17 1550 /*
c7704d57
DG		 1551 * Find out which consumerd to execute. We will first try the
1552 * 64-bit path, then the sessiond's installation directory, and
1553 * fallback on the 32-bit one,
94c55f17 1554 */
63a799e8
AM		 1555 DBG3("Looking for a kernel consumer at these locations:");
1556 DBG3(" 1) %s", consumerd64_bin);
1557 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1558 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1559 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1560 DBG3("Found location #1");
94c55f17 1561 consumer_to_use = consumerd64_bin;
94c55f17 1562 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1563 DBG3("Found location #2");
94c55f17 1564 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1565 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1566 DBG3("Found location #3");
eb1e0bd4 1567 consumer_to_use = consumerd32_bin;
94c55f17 1568 } else {
63a799e8 1569 DBG("Could not find any valid consumerd executable");
94c55f17
AM		 1570 break;
1571 }
1572 DBG("Using kernel consumer at: %s", consumer_to_use);
1573 execl(consumer_to_use,
1574 "lttng-consumerd", verbosity, "-k",
1575 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1576 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1577 NULL);
3bd1e081 1578 break;
7753dea8
MD		 1579 case LTTNG_CONSUMER64_UST:
1580 {
b1e0b6b6 1581 char *tmpnew = NULL;
8f4905da
MD		 1582
1583 if (consumerd64_libdir[0] != '\0') {
1584 char *tmp;
1585 size_t tmplen;
1586
1587 tmp = getenv("LD_LIBRARY_PATH");
1588 if (!tmp) {
1589 tmp = "";
1590 }
1591 tmplen = strlen("LD_LIBRARY_PATH=")
1592 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1593 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1594 if (!tmpnew) {
1595 ret = -ENOMEM;
1596 goto error;
1597 }
1598 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1599 strcat(tmpnew, consumerd64_libdir);
1600 if (tmp[0] != '\0') {
1601 strcat(tmpnew, ":");
1602 strcat(tmpnew, tmp);
1603 }
1604 ret = putenv(tmpnew);
1605 if (ret) {
1606 ret = -errno;
1607 goto error;
1608 }
1609 }
94c55f17 1610 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1611 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1612 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1613 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1614 NULL);
8f4905da
MD		 1615 if (consumerd64_libdir[0] != '\0') {
1616 free(tmpnew);
1617 }
1618 if (ret) {
1619 goto error;
1620 }
3bd1e081 1621 break;
7753dea8
MD		 1622 }
1623 case LTTNG_CONSUMER32_UST:
1624 {
937dde8e 1625 char *tmpnew = NULL;
8f4905da
MD		 1626
1627 if (consumerd32_libdir[0] != '\0') {
1628 char *tmp;
1629 size_t tmplen;
1630
1631 tmp = getenv("LD_LIBRARY_PATH");
1632 if (!tmp) {
1633 tmp = "";
1634 }
1635 tmplen = strlen("LD_LIBRARY_PATH=")
1636 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1637 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1638 if (!tmpnew) {
1639 ret = -ENOMEM;
1640 goto error;
1641 }
1642 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1643 strcat(tmpnew, consumerd32_libdir);
1644 if (tmp[0] != '\0') {
1645 strcat(tmpnew, ":");
1646 strcat(tmpnew, tmp);
1647 }
1648 ret = putenv(tmpnew);
1649 if (ret) {
1650 ret = -errno;
1651 goto error;
1652 }
1653 }
94c55f17 1654 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1655 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1656 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1657 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1658 NULL);
8f4905da
MD		 1659 if (consumerd32_libdir[0] != '\0') {
1660 free(tmpnew);
1661 }
1662 if (ret) {
1663 goto error;
1664 }
7753dea8
MD		 1665 break;
1666 }
3bd1e081
MD		 1667 default:
1668 perror("unknown consumer type");
1669 exit(EXIT_FAILURE);
1670 }
8c0faa1d
DG		 1671 if (errno != 0) {
1672 perror("kernel start consumer exec");
1673 }
1674 exit(EXIT_FAILURE);
1675 } else if (pid > 0) {
1676 ret = pid;
8c0faa1d 1677 } else {
3bd1e081 1678 perror("start consumer fork");
8c0faa1d 1679 ret = -errno;
8c0faa1d 1680 }
8f4905da 1681error:
8c0faa1d
DG		 1682 return ret;
1683}
1684
693bd40b 1685/*
3bd1e081 1686 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1687 */
3bd1e081 1688static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1689{
1690 int ret;
1691
3bd1e081
MD		 1692 pthread_mutex_lock(&consumer_data->pid_mutex);
1693 if (consumer_data->pid != 0) {
1694 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1695 goto end;
1696 }
693bd40b 1697
3bd1e081 1698 ret = spawn_consumerd(consumer_data);
c49dc785 1699 if (ret < 0) {
3bd1e081
MD		 1700 ERR("Spawning consumerd failed");
1701 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1702 goto error;
693bd40b 1703 }
c49dc785 1704
3bd1e081
MD		 1705 /* Setting up the consumer_data pid */
1706 consumer_data->pid = ret;
48842b30 1707 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1708 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1709
3bd1e081
MD		 1710 DBG2("Spawning consumer control thread");
1711 ret = spawn_consumer_thread(consumer_data);
693bd40b 1712 if (ret < 0) {
3bd1e081 1713 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1714 goto error;
1715 }
1716
c49dc785 1717end:
693bd40b
DG		 1718 return 0;
1719
1720error:
1721 return ret;
1722}
1723
b73401da 1724/*
096102bd 1725 * Check version of the lttng-modules.
b73401da 1726 */
096102bd 1727static int validate_lttng_modules_version(void)
b73401da 1728{
096102bd 1729 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD		 1730}
1731
b73401da 1732/*
096102bd 1733 * Setup necessary data for kernel tracer action.
b73401da 1734 */
096102bd 1735static int init_kernel_tracer(void)
b73401da
DG		 1736{
1737 int ret;
b73401da 1738
096102bd
DG		 1739 /* Modprobe lttng kernel modules */
1740 ret = modprobe_lttng_control();
b73401da 1741 if (ret < 0) {
b73401da
DG		 1742 goto error;
1743 }
1744
096102bd
DG		 1745 /* Open debugfs lttng */
1746 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1747 if (kernel_tracer_fd < 0) {
1748 DBG("Failed to open %s", module_proc_lttng);
1749 ret = -1;
1750 goto error_open;
b73401da
DG		 1751 }
1752
096102bd
DG		 1753 /* Validate kernel version */
1754 ret = validate_lttng_modules_version();
b73401da 1755 if (ret < 0) {
096102bd 1756 goto error_version;
b73401da
DG		 1757 }
1758
096102bd 1759 ret = modprobe_lttng_data();
b73401da 1760 if (ret < 0) {
096102bd 1761 goto error_modules;
8c0faa1d
DG		 1762 }
1763
f3ed775e 1764 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG		 1765 return 0;
1766
1767error_version:
1768 modprobe_remove_lttng_control();
1769 close(kernel_tracer_fd);
1770 kernel_tracer_fd = 0;
1771 return LTTCOMM_KERN_VERSION;
1772
1773error_modules:
1774 close(kernel_tracer_fd);
1775
1776error_open:
1777 modprobe_remove_lttng_control();
b73401da
DG		 1778
1779error:
b73401da
DG		 1780 WARN("No kernel tracer available");
1781 kernel_tracer_fd = 0;
096102bd 1782 return LTTCOMM_KERN_NA;
f3ed775e 1783}
33a2b854 1784
f3ed775e 1785/*
54d01ffb 1786 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1787 */
54d01ffb 1788static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1789{
f40799e8 1790 int ret = 0;
8c0faa1d 1791
3bd1e081 1792 if (session->consumer_fds_sent == 0) {
d9800920 1793 /*
54d01ffb
DG		 1794 * Assign default kernel consumer socket if no consumer assigned to the
1795 * kernel session. At this point, it's NOT suppose to be 0 but this is
1796 * an extra security check.
d9800920
DG		 1797 */
1798 if (session->consumer_fd == 0) {
3bd1e081 1799 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1800 }
1801
2bdd86d4 1802 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1803 if (ret < 0) {
f3ed775e
DG		 1804 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1805 goto error;
1806 }
1d4b027a 1807
3bd1e081 1808 session->consumer_fds_sent = 1;
f3ed775e 1809 }
1d4b027a
DG		 1810
1811error:
1812 return ret;
8c0faa1d
DG		 1813}
1814
0177d773
DG		 1815/*
1816 * Create an UST session and add it to the session ust list.
1817 */
44d3bd01 1818static int create_ust_session(struct ltt_session *session,
6df2e2c9 1819 struct lttng_domain *domain)
0177d773 1820{
13384287 1821 struct ltt_ust_session *lus = NULL;
6df2e2c9 1822 int ret;
44d3bd01
DG		 1823
1824 switch (domain->type) {
48842b30 1825 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1826 break;
1827 default:
13384287 1828 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1829 goto error;
1830 }
0177d773
DG		 1831
1832 DBG("Creating UST session");
1833
a991f516 1834 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1835 if (lus == NULL) {
44d3bd01 1836 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1837 goto error;
1838 }
1839
e11d277b 1840 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1841 session->uid, session->gid);
0177d773
DG		 1842 if (ret < 0) {
1843 if (ret != -EEXIST) {
1844 ERR("Trace directory creation error");
44d3bd01 1845 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1846 goto error;
1847 }
1848 }
1849
f6a9efaa
DG		 1850 /* The domain type dictate different actions on session creation */
1851 switch (domain->type) {
48842b30
DG		 1852 case LTTNG_DOMAIN_UST:
1853 /* No ustctl for the global UST domain */
1854 break;
1855 default:
36dc12cc 1856 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1857 goto error;
0177d773 1858 }
6df2e2c9
MD		 1859 lus->uid = session->uid;
1860 lus->gid = session->gid;
f6a9efaa 1861 session->ust_session = lus;
44d3bd01
DG		 1862
1863 return LTTCOMM_OK;
0177d773
DG		 1864
1865error:
1866 free(lus);
1867 return ret;
1868}
1869
333f285e 1870/*
d063d709 1871 * Create a kernel tracer session then create the default channel.
333f285e 1872 */
6df2e2c9 1873static int create_kernel_session(struct ltt_session *session)
333f285e 1874{
f3ed775e 1875 int ret;
f3ed775e
DG		 1876
1877 DBG("Creating kernel session");
1878
1879 ret = kernel_create_session(session, kernel_tracer_fd);
1880 if (ret < 0) {
1881 ret = LTTCOMM_KERN_SESS_FAIL;
1882 goto error;
333f285e
DG		 1883 }
1884
d9800920 1885 /* Set kernel consumer socket fd */
3bd1e081
MD		 1886 if (kconsumer_data.cmd_sock) {
1887 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1888 }
1889
e11d277b 1890 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1891 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1892 if (ret < 0) {
996b65c8 1893 if (ret != -EEXIST) {
7a485870
DG		 1894 ERR("Trace directory creation error");
1895 goto error;
1896 }
1897 }
6df2e2c9
MD		 1898 session->kernel_session->uid = session->uid;
1899 session->kernel_session->gid = session->gid;
7a485870 1900
f3ed775e
DG		 1901error:
1902 return ret;
333f285e
DG		 1903}
1904
8e0af1b4 1905/*
c7704d57
DG		 1906 * Check if the UID or GID match the session. Root user has access to all
1907 * sessions.
8e0af1b4 1908 */
c7704d57 1909static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1910{
c7704d57 1911 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD		 1912 return 0;
1913 } else {
1914 return 1;
1915 }
1916}
1917
1918static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1919{
1920 unsigned int i = 0;
1921 struct ltt_session *session;
1922
1923 DBG("Counting number of available session for UID %d GID %d",
1924 uid, gid);
1925 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1926 /*
1927 * Only list the sessions the user can control.
1928 */
1929 if (!session_access_ok(session, uid, gid)) {
1930 continue;
1931 }
1932 i++;
1933 }
1934 return i;
1935}
1936
6c9cc2ab
DG		 1937/*
1938 * Using the session list, filled a lttng_session array to send back to the
1939 * client for session listing.
1940 *
1941 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1942 * session_lock_list() and session_unlock_list().
6c9cc2ab 1943 */
c7704d57
DG		 1944static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1945 gid_t gid)
6c9cc2ab 1946{
8e0af1b4 1947 unsigned int i = 0;
6c9cc2ab
DG		 1948 struct ltt_session *session;
1949
8e0af1b4
MD		 1950 DBG("Getting all available session for UID %d GID %d",
1951 uid, gid);
6c9cc2ab
DG		 1952 /*
1953 * Iterate over session list and append data after the control struct in
1954 * the buffer.
1955 */
1956 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD		 1957 /*
1958 * Only list the sessions the user can control.
1959 */
1960 if (!session_access_ok(session, uid, gid)) {
1961 continue;
1962 }
6c9cc2ab 1963 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1964 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1965 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1966 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1967 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1968 i++;
1969 }
1970}
1971
9f19cc17
DG		 1972/*
1973 * Fill lttng_channel array of all channels.
1974 */
b551a063 1975static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1976 struct lttng_channel *channels)
1977{
1978 int i = 0;
1979 struct ltt_kernel_channel *kchan;
1980
1981 DBG("Listing channels for session %s", session->name);
1982
b551a063
DG		 1983 switch (domain) {
1984 case LTTNG_DOMAIN_KERNEL:
1985 /* Kernel channels */
1986 if (session->kernel_session != NULL) {
1987 cds_list_for_each_entry(kchan,
1988 &session->kernel_session->channel_list.head, list) {
1989 /* Copy lttng_channel struct to array */
1990 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1991 channels[i].enabled = kchan->enabled;
1992 i++;
1993 }
1994 }
1995 break;
1996 case LTTNG_DOMAIN_UST:
1997 {
bec39940 1998 struct lttng_ht_iter iter;
b551a063
DG		 1999 struct ltt_ust_channel *uchan;
2000
bec39940
DG		 2001 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2002 &iter.iter, uchan, node.node) {
b551a063
DG		 2003 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2004 channels[i].attr.overwrite = uchan->attr.overwrite;
2005 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2006 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2007 channels[i].attr.switch_timer_interval =
2008 uchan->attr.switch_timer_interval;
2009 channels[i].attr.read_timer_interval =
2010 uchan->attr.read_timer_interval;
aea829b3 2011 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2012 switch (uchan->attr.output) {
2013 case LTTNG_UST_MMAP:
2014 default:
2015 channels[i].attr.output = LTTNG_EVENT_MMAP;
2016 break;
2017 }
befe0905 2018 i++;
b551a063
DG		 2019 }
2020 break;
2021 }
2022 default:
2023 break;
2024 }
2025}
2026
2027/*
2028 * Create a list of ust global domain events.
2029 */
2030static int list_lttng_ust_global_events(char *channel_name,
2031 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2032{
2033 int i = 0, ret = 0;
2034 unsigned int nb_event = 0;
bec39940
DG		 2035 struct lttng_ht_iter iter;
2036 struct lttng_ht_node_str *node;
b551a063
DG		 2037 struct ltt_ust_channel *uchan;
2038 struct ltt_ust_event *uevent;
2039 struct lttng_event *tmp;
2040
2041 DBG("Listing UST global events for channel %s", channel_name);
2042
2043 rcu_read_lock();
2044
bec39940
DG		 2045 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2046 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG		 2047 if (node == NULL) {
2048 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2049 goto error;
b551a063
DG		 2050 }
2051
bec39940 2052 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2053
bec39940 2054 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2055
b551a063
DG		 2056 if (nb_event == 0) {
2057 ret = nb_event;
2058 goto error;
2059 }
2060
2061 DBG3("Listing UST global %d events", nb_event);
2062
2063 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2064 if (tmp == NULL) {
2065 ret = -LTTCOMM_FATAL;
2066 goto error;
2067 }
2068
bec39940 2069 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG		 2070 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2071 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2072 tmp[i].enabled = uevent->enabled;
2073 switch (uevent->attr.instrumentation) {
2074 case LTTNG_UST_TRACEPOINT:
2075 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2076 break;
2077 case LTTNG_UST_PROBE:
2078 tmp[i].type = LTTNG_EVENT_PROBE;
2079 break;
2080 case LTTNG_UST_FUNCTION:
2081 tmp[i].type = LTTNG_EVENT_FUNCTION;
2082 break;
0cda4f28 2083 }
8005f29a 2084 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2085 switch (uevent->attr.loglevel_type) {
8005f29a 2086 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2087 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2088 break;
8005f29a 2089 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2090 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD		 2091 break;
2092 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2093 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2094 break;
9f19cc17 2095 }
d7b75b30 2096 i++;
9f19cc17
DG		 2097 }
2098
b551a063
DG		 2099 ret = nb_event;
2100 *events = tmp;
2101
2102error:
2103 rcu_read_unlock();
2104 return ret;
9f19cc17
DG		 2105}
2106
2107/*
b551a063 2108 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2109 */
b551a063
DG		 2110static int list_lttng_kernel_events(char *channel_name,
2111 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2112{
b551a063
DG		 2113 int i = 0, ret;
2114 unsigned int nb_event;
9f19cc17 2115 struct ltt_kernel_event *event;
b551a063
DG		 2116 struct ltt_kernel_channel *kchan;
2117
2118 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2119 if (kchan == NULL) {
2120 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2121 goto error;
2122 }
2123
2124 nb_event = kchan->event_count;
9f19cc17
DG		 2125
2126 DBG("Listing events for channel %s", kchan->channel->name);
2127
b551a063
DG		 2128 if (nb_event == 0) {
2129 ret = nb_event;
2130 goto error;
2131 }
2132
2133 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2134 if (*events == NULL) {
2135 ret = LTTCOMM_FATAL;
2136 goto error;
2137 }
2138
9f19cc17
DG		 2139 /* Kernel channels */
2140 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2141 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2142 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2143 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2144 switch (event->event->instrumentation) {
2145 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2146 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2147 break;
2148 case LTTNG_KERNEL_KPROBE:
2149 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2150 (*events)[i].type = LTTNG_EVENT_PROBE;
2151 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2152 sizeof(struct lttng_kernel_kprobe));
2153 break;
2154 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2155 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2156 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2157 sizeof(struct lttng_kernel_function));
2158 break;
0133c199 2159 case LTTNG_KERNEL_NOOP:
b551a063 2160 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2161 break;
a54bd42d 2162 case LTTNG_KERNEL_SYSCALL:
b551a063 2163 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2164 break;
7a3d1328
MD		 2165 case LTTNG_KERNEL_ALL:
2166 assert(0);
2167 break;
9f19cc17
DG		 2168 }
2169 i++;
2170 }
b551a063
DG		 2171
2172 return nb_event;
2173
2174error:
2175 return ret;
9f19cc17
DG		 2176}
2177
fac6795d 2178/*
54d01ffb 2179 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2180 */
54d01ffb
DG		 2181static int cmd_disable_channel(struct ltt_session *session,
2182 int domain, char *channel_name)
fac6795d 2183{
54d01ffb 2184 int ret;
78f0bacd
DG		 2185 struct ltt_ust_session *usess;
2186
2187 usess = session->ust_session;
379473d2 2188
54d01ffb 2189 switch (domain) {
78f0bacd
DG		 2190 case LTTNG_DOMAIN_KERNEL:
2191 {
2192 ret = channel_kernel_disable(session->kernel_session,
2193 channel_name);
2194 if (ret != LTTCOMM_OK) {
2195 goto error;
2196 }
54d01ffb 2197
78f0bacd
DG		 2198 kernel_wait_quiescent(kernel_tracer_fd);
2199 break;
2200 }
2201 case LTTNG_DOMAIN_UST:
2202 {
2203 struct ltt_ust_channel *uchan;
bec39940 2204 struct lttng_ht *chan_ht;
78f0bacd 2205
7885e399
DG		 2206 chan_ht = usess->domain_global.channels;
2207
2208 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2209 if (uchan == NULL) {
2210 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2211 goto error;
78f0bacd
DG		 2212 }
2213
7885e399
DG		 2214 ret = channel_ust_disable(usess, domain, uchan);
2215 if (ret != LTTCOMM_OK) {
78f0bacd
DG		 2216 goto error;
2217 }
78f0bacd
DG		 2218 break;
2219 }
d78d6610 2220#if 0
78f0bacd
DG		 2221 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2222 case LTTNG_DOMAIN_UST_EXEC_NAME:
2223 case LTTNG_DOMAIN_UST_PID:
d78d6610 2224#endif
78f0bacd
DG		 2225 default:
2226 ret = LTTCOMM_UNKNOWN_DOMAIN;
2227 goto error;
20fe2104
DG		 2228 }
2229
54d01ffb 2230 ret = LTTCOMM_OK;
d65106b1 2231
54d01ffb
DG		 2232error:
2233 return ret;
2234}
2235
2236/*
2237 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2238 */
44d3bd01 2239static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2240 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2241{
2242 int ret;
f6a9efaa 2243 struct ltt_ust_session *usess = session->ust_session;
bec39940 2244 struct lttng_ht *chan_ht;
f6a9efaa 2245
5d56b5aa 2246 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2247
aea829b3 2248 switch (domain) {
44d3bd01
DG		 2249 case LTTNG_DOMAIN_KERNEL:
2250 {
2251 struct ltt_kernel_channel *kchan;
54d01ffb 2252
44d3bd01
DG		 2253 kchan = trace_kernel_get_channel_by_name(attr->name,
2254 session->kernel_session);
2255 if (kchan == NULL) {
2256 ret = channel_kernel_create(session->kernel_session,
2257 attr, kernel_poll_pipe[1]);
2258 } else {
2259 ret = channel_kernel_enable(session->kernel_session, kchan);
2260 }
2261
2262 if (ret != LTTCOMM_OK) {
2263 goto error;
2264 }
2265
2266 kernel_wait_quiescent(kernel_tracer_fd);
2267 break;
2268 }
f6a9efaa
DG		 2269 case LTTNG_DOMAIN_UST:
2270 {
2271 struct ltt_ust_channel *uchan;
2272
7885e399 2273 chan_ht = usess->domain_global.channels;
f6a9efaa 2274
7885e399 2275 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2276 if (uchan == NULL) {
7885e399 2277 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2278 } else {
7885e399 2279 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2280 }
f6a9efaa
DG		 2281 break;
2282 }
d78d6610 2283#if 0
78f0bacd
DG		 2284 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2285 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2286 case LTTNG_DOMAIN_UST_PID:
d78d6610 2287#endif
44d3bd01
DG		 2288 default:
2289 ret = LTTCOMM_UNKNOWN_DOMAIN;
2290 goto error;
54d01ffb
DG		 2291 }
2292
54d01ffb
DG		 2293error:
2294 return ret;
2295}
2296
2297/*
2298 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2299 */
2300static int cmd_disable_event(struct ltt_session *session, int domain,
2301 char *channel_name, char *event_name)
2302{
2303 int ret;
54d01ffb
DG		 2304
2305 switch (domain) {
2306 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2307 {
2308 struct ltt_kernel_channel *kchan;
b0a40d28 2309 struct ltt_kernel_session *ksess;
2bdd86d4 2310
b0a40d28
DG		 2311 ksess = session->kernel_session;
2312
2313 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2314 if (kchan == NULL) {
2315 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2316 goto error;
d65106b1
DG		 2317 }
2318
b0a40d28 2319 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2320 if (ret != LTTCOMM_OK) {
2321 goto error;
2322 }
2323
2324 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2325 break;
2bdd86d4
MD		 2326 }
2327 case LTTNG_DOMAIN_UST:
b0a40d28 2328 {
b0a40d28 2329 struct ltt_ust_channel *uchan;
7f79d3a1 2330 struct ltt_ust_session *usess;
b0a40d28
DG		 2331
2332 usess = session->ust_session;
2333
2334 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2335 channel_name);
2336 if (uchan == NULL) {
2337 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2338 goto error;
2339 }
2340
7f79d3a1
DG		 2341 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2342 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2343 goto error;
2344 }
2345
7f79d3a1 2346 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2347 channel_name);
b0a40d28
DG		 2348 break;
2349 }
d78d6610 2350#if 0
2bdd86d4
MD		 2351 case LTTNG_DOMAIN_UST_EXEC_NAME:
2352 case LTTNG_DOMAIN_UST_PID:
2353 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2354#endif
54d01ffb 2355 default:
1ab1ea0b 2356 ret = LTTCOMM_UND;
54d01ffb 2357 goto error;
d65106b1 2358 }
26cc6b4e 2359
54d01ffb
DG		 2360 ret = LTTCOMM_OK;
2361
2362error:
2363 return ret;
2364}
2365
2366/*
2367 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2368 */
2369static int cmd_disable_event_all(struct ltt_session *session, int domain,
2370 char *channel_name)
2371{
2372 int ret;
54d01ffb
DG		 2373
2374 switch (domain) {
2375 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2376 {
2377 struct ltt_kernel_session *ksess;
2378 struct ltt_kernel_channel *kchan;
2379
2380 ksess = session->kernel_session;
2381
2382 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2383 if (kchan == NULL) {
2384 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2385 goto error;
26cc6b4e
DG		 2386 }
2387
9730260e 2388 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2389 if (ret != LTTCOMM_OK) {
0b97ec54 2390 goto error;
26cc6b4e
DG		 2391 }
2392
54d01ffb 2393 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2394 break;
9730260e
DG		 2395 }
2396 case LTTNG_DOMAIN_UST:
2397 {
2398 struct ltt_ust_session *usess;
2399 struct ltt_ust_channel *uchan;
2400
2401 usess = session->ust_session;
2402
2403 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2404 channel_name);
2405 if (uchan == NULL) {
2406 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2407 goto error;
2408 }
2409
7f79d3a1
DG		 2410 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2411 if (ret != 0) {
9730260e
DG		 2412 goto error;
2413 }
2414
7f79d3a1 2415 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2416
2417 break;
2418 }
d78d6610 2419#if 0
9730260e
DG		 2420 case LTTNG_DOMAIN_UST_EXEC_NAME:
2421 case LTTNG_DOMAIN_UST_PID:
2422 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2423#endif
54d01ffb 2424 default:
1ab1ea0b 2425 ret = LTTCOMM_UND;
54d01ffb 2426 goto error;
26cc6b4e 2427 }
e953ef25 2428
54d01ffb 2429 ret = LTTCOMM_OK;
e953ef25 2430
54d01ffb
DG		 2431error:
2432 return ret;
2433}
f5177a38 2434
54d01ffb
DG		 2435/*
2436 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2437 */
2438static int cmd_add_context(struct ltt_session *session, int domain,
2439 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2440{
2441 int ret;
f5177a38 2442
54d01ffb
DG		 2443 switch (domain) {
2444 case LTTNG_DOMAIN_KERNEL:
2445 /* Add kernel context to kernel tracer */
2446 ret = context_kernel_add(session->kernel_session, ctx,
2447 event_name, channel_name);
2448 if (ret != LTTCOMM_OK) {
f5177a38 2449 goto error;
e953ef25 2450 }
2bdd86d4
MD		 2451 break;
2452 case LTTNG_DOMAIN_UST:
2453 {
55cc08a6 2454 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2455
55cc08a6
DG		 2456 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2457 if (ret != LTTCOMM_OK) {
2458 goto error;
2bdd86d4 2459 }
e953ef25 2460 break;
2bdd86d4 2461 }
d78d6610 2462#if 0
55cc08a6
DG		 2463 case LTTNG_DOMAIN_UST_EXEC_NAME:
2464 case LTTNG_DOMAIN_UST_PID:
2465 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2466#endif
54d01ffb 2467 default:
1ab1ea0b 2468 ret = LTTCOMM_UND;
54d01ffb 2469 goto error;
e953ef25 2470 }
950131af 2471
54d01ffb 2472 ret = LTTCOMM_OK;
950131af 2473
54d01ffb
DG		 2474error:
2475 return ret;
2476}
2477
2478/*
2479 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2480 */
2481static int cmd_enable_event(struct ltt_session *session, int domain,
2482 char *channel_name, struct lttng_event *event)
2483{
2484 int ret;
f6cd6b0f 2485 struct lttng_channel *attr;
48842b30 2486 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2487
2488 switch (domain) {
2489 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2490 {
2491 struct ltt_kernel_channel *kchan;
2492
54d01ffb
DG		 2493 kchan = trace_kernel_get_channel_by_name(channel_name,
2494 session->kernel_session);
2495 if (kchan == NULL) {
f6cd6b0f
DG		 2496 attr = channel_new_default_attr(domain);
2497 if (attr == NULL) {
2498 ret = LTTCOMM_FATAL;
2499 goto error;
2500 }
2501 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2502
54d01ffb 2503 /* This call will notify the kernel thread */
44d3bd01 2504 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2505 attr, kernel_poll_pipe[1]);
54d01ffb 2506 if (ret != LTTCOMM_OK) {
ff4d74e6 2507 free(attr);
f5177a38
DG		 2508 goto error;
2509 }
ff4d74e6 2510 free(attr);
54d01ffb 2511 }
950131af 2512
54d01ffb
DG		 2513 /* Get the newly created kernel channel pointer */
2514 kchan = trace_kernel_get_channel_by_name(channel_name,
2515 session->kernel_session);
2516 if (kchan == NULL) {
2517 /* This sould not happen... */
2518 ret = LTTCOMM_FATAL;
2519 goto error;
2520 }
f5177a38 2521
48842b30
DG		 2522 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2523 event);
54d01ffb 2524 if (ret != LTTCOMM_OK) {
f5177a38 2525 goto error;
950131af
DG		 2526 }
2527
54d01ffb 2528 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2529 break;
2bdd86d4
MD		 2530 }
2531 case LTTNG_DOMAIN_UST:
2532 {
aea829b3 2533 struct lttng_channel *attr;
edb67388 2534 struct ltt_ust_channel *uchan;
2bdd86d4 2535
edb67388 2536 /* Get channel from global UST domain */
48842b30
DG		 2537 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2538 channel_name);
2539 if (uchan == NULL) {
aea829b3
DG		 2540 /* Create default channel */
2541 attr = channel_new_default_attr(domain);
2542 if (attr == NULL) {
2543 ret = LTTCOMM_FATAL;
2544 goto error;
2545 }
596219f7 2546 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2547 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2548
7885e399 2549 ret = channel_ust_create(usess, domain, attr);
edb67388 2550 if (ret != LTTCOMM_OK) {
ff4d74e6 2551 free(attr);
aea829b3
DG		 2552 goto error;
2553 }
aea829b3
DG		 2554 free(attr);
2555
2556 /* Get the newly created channel reference back */
2557 uchan = trace_ust_find_channel_by_name(
2558 usess->domain_global.channels, channel_name);
2559 if (uchan == NULL) {
2560 /* Something is really wrong */
2561 ret = LTTCOMM_FATAL;
2562 goto error;
2563 }
48842b30 2564 }
2bdd86d4 2565
edb67388 2566 /* At this point, the session and channel exist on the tracer */
edb67388
DG		 2567 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2568 if (ret != LTTCOMM_OK) {
48842b30 2569 goto error;
2bdd86d4
MD		 2570 }
2571 break;
2572 }
d78d6610 2573#if 0
2bdd86d4
MD		 2574 case LTTNG_DOMAIN_UST_EXEC_NAME:
2575 case LTTNG_DOMAIN_UST_PID:
2576 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2577#endif
54d01ffb 2578 default:
1ab1ea0b 2579 ret = LTTCOMM_UND;
54d01ffb 2580 goto error;
950131af 2581 }
d36b8583 2582
54d01ffb 2583 ret = LTTCOMM_OK;
d36b8583 2584
54d01ffb
DG		 2585error:
2586 return ret;
2587}
7d29a247 2588
54d01ffb
DG		 2589/*
2590 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2591 */
2592static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2593 char *channel_name, int event_type)
54d01ffb
DG		 2594{
2595 int ret;
2596 struct ltt_kernel_channel *kchan;
7d29a247 2597
54d01ffb
DG		 2598 switch (domain) {
2599 case LTTNG_DOMAIN_KERNEL:
2600 kchan = trace_kernel_get_channel_by_name(channel_name,
2601 session->kernel_session);
2602 if (kchan == NULL) {
2603 /* This call will notify the kernel thread */
44d3bd01
DG		 2604 ret = channel_kernel_create(session->kernel_session, NULL,
2605 kernel_poll_pipe[1]);
54d01ffb
DG		 2606 if (ret != LTTCOMM_OK) {
2607 goto error;
d36b8583 2608 }
0d0c377a 2609
8f69e5eb
DG		 2610 /* Get the newly created kernel channel pointer */
2611 kchan = trace_kernel_get_channel_by_name(channel_name,
2612 session->kernel_session);
2613 if (kchan == NULL) {
2614 /* This sould not happen... */
2615 ret = LTTCOMM_FATAL;
2616 goto error;
2617 }
2618
54d01ffb 2619 }
0fdd1e2c 2620
7a3d1328 2621 switch (event_type) {
76d45b40 2622 case LTTNG_EVENT_SYSCALL:
7a3d1328 2623 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2624 kchan, kernel_tracer_fd);
7a3d1328 2625 break;
76d45b40 2626 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2627 /*
7a3d1328
MD		 2628 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2629 * events already registered to the channel.
8c9ae521 2630 */
7a3d1328
MD		 2631 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2632 kchan, kernel_tracer_fd);
2633 break;
76d45b40 2634 case LTTNG_EVENT_ALL:
7a3d1328 2635 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2636 ret = event_kernel_enable_all(session->kernel_session,
2637 kchan, kernel_tracer_fd);
7a3d1328
MD		 2638 break;
2639 default:
2640 ret = LTTCOMM_KERN_ENABLE_FAIL;
2641 goto error;
8c9ae521 2642 }
8f69e5eb
DG		 2643
2644 /* Manage return value */
54d01ffb 2645 if (ret != LTTCOMM_OK) {
0d0c377a 2646 goto error;
d36b8583
DG		 2647 }
2648
54d01ffb 2649 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2650 break;
76d45b40
DG		 2651 case LTTNG_DOMAIN_UST:
2652 {
2653 struct lttng_channel *attr;
2654 struct ltt_ust_channel *uchan;
2655 struct ltt_ust_session *usess = session->ust_session;
2656
2657 /* Get channel from global UST domain */
2658 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2659 channel_name);
2660 if (uchan == NULL) {
2661 /* Create default channel */
2662 attr = channel_new_default_attr(domain);
2663 if (attr == NULL) {
2664 ret = LTTCOMM_FATAL;
2665 goto error;
2666 }
2667 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2668 attr->name[NAME_MAX - 1] = '\0';
2669
2670 /* Use the internal command enable channel */
7885e399 2671 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2672 if (ret != LTTCOMM_OK) {
2673 free(attr);
2674 goto error;
2675 }
2676 free(attr);
2677
2678 /* Get the newly created channel reference back */
2679 uchan = trace_ust_find_channel_by_name(
2680 usess->domain_global.channels, channel_name);
2681 if (uchan == NULL) {
2682 /* Something is really wrong */
2683 ret = LTTCOMM_FATAL;
2684 goto error;
2685 }
2686 }
2687
2688 /* At this point, the session and channel exist on the tracer */
2689
2690 switch (event_type) {
2691 case LTTNG_EVENT_ALL:
2692 case LTTNG_EVENT_TRACEPOINT:
2693 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2694 if (ret != LTTCOMM_OK) {
2695 goto error;
2696 }
2697 break;
2698 default:
2699 ret = LTTCOMM_UST_ENABLE_FAIL;
2700 goto error;
2701 }
2702
2703 /* Manage return value */
2704 if (ret != LTTCOMM_OK) {
2705 goto error;
2706 }
2707
2708 break;
2709 }
d78d6610 2710#if 0
76d45b40
DG		 2711 case LTTNG_DOMAIN_UST_EXEC_NAME:
2712 case LTTNG_DOMAIN_UST_PID:
2713 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2714#endif
54d01ffb 2715 default:
1ab1ea0b 2716 ret = LTTCOMM_UND;
54d01ffb 2717 goto error;
d36b8583 2718 }
f3ed775e 2719
54d01ffb
DG		 2720 ret = LTTCOMM_OK;
2721
2722error:
2723 return ret;
2724}
2725
2726/*
2727 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2728 */
2729static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2730{
2731 int ret;
2732 ssize_t nb_events = 0;
2733
2734 switch (domain) {
2735 case LTTNG_DOMAIN_KERNEL:
2736 nb_events = kernel_list_events(kernel_tracer_fd, events);
2737 if (nb_events < 0) {
2738 ret = LTTCOMM_KERN_LIST_FAIL;
2739 goto error;
894be886 2740 }
54d01ffb 2741 break;
b551a063
DG		 2742 case LTTNG_DOMAIN_UST:
2743 nb_events = ust_app_list_events(events);
2744 if (nb_events < 0) {
2745 ret = LTTCOMM_UST_LIST_FAIL;
2746 goto error;
2747 }
2748 break;
54d01ffb 2749 default:
1ab1ea0b 2750 ret = LTTCOMM_UND;
54d01ffb
DG		 2751 goto error;
2752 }
894be886 2753
54d01ffb 2754 return nb_events;
7d29a247 2755
54d01ffb
DG		 2756error:
2757 /* Return negative value to differentiate return code */
2758 return -ret;
2759}
b389abbe 2760
54d01ffb
DG		 2761/*
2762 * Command LTTNG_START_TRACE processed by the client thread.
2763 */
2764static int cmd_start_trace(struct ltt_session *session)
2765{
2766 int ret;
54d01ffb 2767 struct ltt_kernel_session *ksession;
b9d9b220 2768 struct ltt_ust_session *usess;
b389abbe 2769
54d01ffb
DG		 2770 /* Short cut */
2771 ksession = session->kernel_session;
b9d9b220 2772 usess = session->ust_session;
5eb91c98 2773
b9ef1c83
DG		 2774 if (session->enabled) {
2775 ret = LTTCOMM_UST_START_FAIL;
2776 goto error;
2777 }
2778
464dd62d
MD		 2779 session->enabled = 1;
2780
54d01ffb
DG		 2781 /* Kernel tracing */
2782 if (ksession != NULL) {
2bdd86d4
MD		 2783 struct ltt_kernel_channel *kchan;
2784
54d01ffb
DG		 2785 /* Open kernel metadata */
2786 if (ksession->metadata == NULL) {
2787 ret = kernel_open_metadata(ksession, ksession->trace_path);
2788 if (ret < 0) {
2789 ret = LTTCOMM_KERN_META_FAIL;
2790 goto error;
b389abbe 2791 }
54d01ffb 2792 }
7d29a247 2793
54d01ffb
DG		 2794 /* Open kernel metadata stream */
2795 if (ksession->metadata_stream_fd == 0) {
2796 ret = kernel_open_metadata_stream(ksession);
2797 if (ret < 0) {
2798 ERR("Kernel create metadata stream failed");
2799 ret = LTTCOMM_KERN_STREAM_FAIL;
2800 goto error;
2801 }
2802 }
2803
2804 /* For each channel */
2805 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2806 if (kchan->stream_count == 0) {
2807 ret = kernel_open_channel_stream(kchan);
2808 if (ret < 0) {
2809 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2810 goto error;
2811 }
54d01ffb
DG		 2812 /* Update the stream global counter */
2813 ksession->stream_count_global += ret;
7d29a247 2814 }
54d01ffb
DG		 2815 }
2816
2817 /* Setup kernel consumer socket and send fds to it */
2818 ret = init_kernel_tracing(ksession);
2819 if (ret < 0) {
2820 ret = LTTCOMM_KERN_START_FAIL;
2821 goto error;
2822 }
2823
2824 /* This start the kernel tracing */
2825 ret = kernel_start_session(ksession);
2826 if (ret < 0) {
2827 ret = LTTCOMM_KERN_START_FAIL;
2828 goto error;
2829 }
2830
2831 /* Quiescent wait after starting trace */
2832 kernel_wait_quiescent(kernel_tracer_fd);
2833 }
2834
36dc12cc 2835 /* Flag session that trace should start automatically */
b9d9b220
DG		 2836 if (usess) {
2837 usess->start_trace = 1;
36dc12cc 2838
b9d9b220
DG		 2839 ret = ust_app_start_trace_all(usess);
2840 if (ret < 0) {
2841 ret = LTTCOMM_UST_START_FAIL;
2842 goto error;
2843 }
2bdd86d4 2844 }
54d01ffb
DG		 2845
2846 ret = LTTCOMM_OK;
2847
2848error:
2849 return ret;
2850}
2851
2852/*
2853 * Command LTTNG_STOP_TRACE processed by the client thread.
2854 */
2855static int cmd_stop_trace(struct ltt_session *session)
2856{
2857 int ret;
2858 struct ltt_kernel_channel *kchan;
2859 struct ltt_kernel_session *ksession;
8be98f9a 2860 struct ltt_ust_session *usess;
54d01ffb
DG		 2861
2862 /* Short cut */
2863 ksession = session->kernel_session;
8be98f9a 2864 usess = session->ust_session;
54d01ffb 2865
b9ef1c83 2866 if (!session->enabled) {
190df5ac 2867 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG		 2868 goto error;
2869 }
2870
464dd62d
MD		 2871 session->enabled = 0;
2872
54d01ffb
DG		 2873 /* Kernel tracer */
2874 if (ksession != NULL) {
2875 DBG("Stop kernel tracing");
2876
2877 /* Flush all buffers before stopping */
2878 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2879 if (ret < 0) {
2880 ERR("Kernel metadata flush failed");
2881 }
f34daff7 2882
54d01ffb
DG		 2883 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2884 ret = kernel_flush_buffer(kchan);
0d0c377a 2885 if (ret < 0) {
54d01ffb 2886 ERR("Kernel flush buffer error");
7d29a247 2887 }
54d01ffb 2888 }
19e70852 2889
54d01ffb
DG		 2890 ret = kernel_stop_session(ksession);
2891 if (ret < 0) {
2892 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2893 goto error;
f3ed775e 2894 }
54d01ffb
DG		 2895
2896 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2897 }
54d01ffb 2898
8be98f9a
MD		 2899 if (usess) {
2900 usess->start_trace = 0;
2bdd86d4 2901
8be98f9a 2902 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2903 if (ret < 0) {
190df5ac 2904 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD		 2905 goto error;
2906 }
2bdd86d4 2907 }
54d01ffb
DG		 2908
2909 ret = LTTCOMM_OK;
2910
2911error:
2912 return ret;
2913}
2914
2915/*
2916 * Command LTTNG_CREATE_SESSION processed by the client thread.
2917 */
730389d9 2918static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds)
54d01ffb
DG		 2919{
2920 int ret;
2921
730389d9
DG		 2922 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
2923 LTTNG_SOCK_GET_GID_CRED(creds));
54d01ffb
DG		 2924 if (ret != LTTCOMM_OK) {
2925 goto error;
2926 }
2927
2928 ret = LTTCOMM_OK;
2929
2930error:
2931 return ret;
2932}
2933
2934/*
2935 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2936 */
2937static int cmd_destroy_session(struct ltt_session *session, char *name)
2938{
2939 int ret;
2940
2941 /* Clean kernel session teardown */
2942 teardown_kernel_session(session);
84cd17c6
MD		 2943 /* UST session teardown */
2944 teardown_ust_session(session);
54d01ffb
DG		 2945
2946 /*
2947 * Must notify the kernel thread here to update it's poll setin order
2948 * to remove the channel(s)' fd just destroyed.
2949 */
2950 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2951 if (ret < 0) {
2952 perror("write kernel poll pipe");
2953 }
2954
271933a4 2955 ret = session_destroy(session);
54d01ffb
DG		 2956
2957 return ret;
2958}
2959
2960/*
2961 * Command LTTNG_CALIBRATE processed by the client thread.
2962 */
2963static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2964{
2965 int ret;
2966
2967 switch (domain) {
2968 case LTTNG_DOMAIN_KERNEL:
33a2b854 2969 {
54d01ffb 2970 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2971
54d01ffb
DG		 2972 kcalibrate.type = calibrate->type;
2973 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2974 if (ret < 0) {
54d01ffb
DG		 2975 ret = LTTCOMM_KERN_ENABLE_FAIL;
2976 goto error;
33a2b854 2977 }
54d01ffb
DG		 2978 break;
2979 }
4466912f
DG		 2980 case LTTNG_DOMAIN_UST:
2981 {
2982 struct lttng_ust_calibrate ucalibrate;
2983
2984 ucalibrate.type = calibrate->type;
2985 ret = ust_app_calibrate_glb(&ucalibrate);
2986 if (ret < 0) {
2987 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2988 goto error;
2989 }
2990 break;
2991 }
54d01ffb 2992 default:
1ab1ea0b 2993 ret = LTTCOMM_UND;
54d01ffb
DG		 2994 goto error;
2995 }
33a2b854 2996
54d01ffb 2997 ret = LTTCOMM_OK;
33a2b854 2998
54d01ffb
DG		 2999error:
3000 return ret;
3001}
7d29a247 3002
54d01ffb
DG		 3003/*
3004 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3005 */
3006static int cmd_register_consumer(struct ltt_session *session, int domain,
3007 char *sock_path)
3008{
3009 int ret, sock;
b389abbe 3010
54d01ffb
DG		 3011 switch (domain) {
3012 case LTTNG_DOMAIN_KERNEL:
3013 /* Can't register a consumer if there is already one */
48c4f28c 3014 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 3015 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3016 goto error;
3017 }
3018
3019 sock = lttcomm_connect_unix_sock(sock_path);
3020 if (sock < 0) {
3021 ret = LTTCOMM_CONNECT_FAIL;
3022 goto error;
3023 }
3024
3025 session->kernel_session->consumer_fd = sock;
3026 break;
3027 default:
3028 /* TODO: Userspace tracing */
1ab1ea0b 3029 ret = LTTCOMM_UND;
54d01ffb
DG		 3030 goto error;
3031 }
3032
3033 ret = LTTCOMM_OK;
3034
3035error:
3036 return ret;
3037}
3038
3039/*
3040 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3041 */
3042static ssize_t cmd_list_domains(struct ltt_session *session,
3043 struct lttng_domain **domains)
3044{
b551a063 3045 int ret, index = 0;
54d01ffb
DG		 3046 ssize_t nb_dom = 0;
3047
3048 if (session->kernel_session != NULL) {
b551a063 3049 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3050 nb_dom++;
3051 }
3052
b551a063
DG		 3053 if (session->ust_session != NULL) {
3054 DBG3("Listing domains found UST global domain");
3055 nb_dom++;
3056 }
54d01ffb 3057
b551a063 3058 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3059 if (*domains == NULL) {
3060 ret = -LTTCOMM_FATAL;
3061 goto error;
3062 }
3063
b551a063
DG		 3064 if (session->kernel_session != NULL) {
3065 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3066 index++;
3067 }
3068
3069 if (session->ust_session != NULL) {
3070 (*domains)[index].type = LTTNG_DOMAIN_UST;
3071 index++;
3072 }
54d01ffb 3073
54d01ffb
DG		 3074 return nb_dom;
3075
3076error:
3077 return ret;
3078}
3079
3080/*
3081 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3082 */
b551a063 3083static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3084 struct lttng_channel **channels)
3085{
3086 int ret;
3087 ssize_t nb_chan = 0;
3088
b551a063
DG		 3089 switch (domain) {
3090 case LTTNG_DOMAIN_KERNEL:
3091 if (session->kernel_session != NULL) {
3092 nb_chan = session->kernel_session->channel_count;
3093 }
0df502fd 3094 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3095 break;
3096 case LTTNG_DOMAIN_UST:
3097 if (session->ust_session != NULL) {
bec39940 3098 nb_chan = lttng_ht_get_count(
b551a063
DG		 3099 session->ust_session->domain_global.channels);
3100 }
0df502fd 3101 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3102 break;
3103 default:
3104 *channels = NULL;
1ab1ea0b 3105 ret = -LTTCOMM_UND;
54d01ffb
DG		 3106 goto error;
3107 }
3108
b551a063
DG		 3109 if (nb_chan > 0) {
3110 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3111 if (*channels == NULL) {
3112 ret = -LTTCOMM_FATAL;
3113 goto error;
3114 }
54d01ffb 3115
b551a063
DG		 3116 list_lttng_channels(domain, session, *channels);
3117 } else {
3118 *channels = NULL;
3119 }
2bdd86d4 3120
54d01ffb
DG		 3121 return nb_chan;
3122
3123error:
3124 return ret;
3125}
3126
3127/*
3128 * Command LTTNG_LIST_EVENTS processed by the client thread.
3129 */
b551a063 3130static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3131 char *channel_name, struct lttng_event **events)
3132{
b551a063 3133 int ret = 0;
54d01ffb 3134 ssize_t nb_event = 0;
54d01ffb 3135
b551a063
DG		 3136 switch (domain) {
3137 case LTTNG_DOMAIN_KERNEL:
3138 if (session->kernel_session != NULL) {
3139 nb_event = list_lttng_kernel_events(channel_name,
3140 session->kernel_session, events);
54d01ffb 3141 }
b551a063
DG		 3142 break;
3143 case LTTNG_DOMAIN_UST:
3144 {
3145 if (session->ust_session != NULL) {
3146 nb_event = list_lttng_ust_global_events(channel_name,
3147 &session->ust_session->domain_global, events);
3148 }
3149 break;
54d01ffb 3150 }
b551a063 3151 default:
1ab1ea0b 3152 ret = -LTTCOMM_UND;
54d01ffb
DG		 3153 goto error;
3154 }
3155
b551a063 3156 ret = nb_event;
54d01ffb
DG		 3157
3158error:
3159 return ret;
3160}
3161
3162/*
3163 * Process the command requested by the lttng client within the command
3164 * context structure. This function make sure that the return structure (llm)
3165 * is set and ready for transmission before returning.
3166 *
3167 * Return any error encountered or 0 for success.
3168 */
3169static int process_client_msg(struct command_ctx *cmd_ctx)
3170{
3171 int ret = LTTCOMM_OK;
44d3bd01 3172 int need_tracing_session = 1;
2e09ba09 3173 int need_domain;
54d01ffb
DG		 3174
3175 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3176
2e09ba09
MD		 3177 switch (cmd_ctx->lsm->cmd_type) {
3178 case LTTNG_CREATE_SESSION:
3179 case LTTNG_DESTROY_SESSION:
3180 case LTTNG_LIST_SESSIONS:
3181 case LTTNG_LIST_DOMAINS:
3182 case LTTNG_START_TRACE:
3183 case LTTNG_STOP_TRACE:
3184 need_domain = 0;
3aace903 3185 break;
2e09ba09
MD		 3186 default:
3187 need_domain = 1;
3188 }
3189
3190 if (opt_no_kernel && need_domain
3191 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
4fba7219
DG		 3192 ret = LTTCOMM_KERN_NA;
3193 goto error;
3194 }
3195
54d01ffb
DG		 3196 /*
3197 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3198 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3199 * command.
3200 */
3201 switch(cmd_ctx->lsm->cmd_type) {
3202 case LTTNG_LIST_SESSIONS:
3203 case LTTNG_LIST_TRACEPOINTS:
3204 case LTTNG_LIST_DOMAINS:
3205 case LTTNG_LIST_CHANNELS:
3206 case LTTNG_LIST_EVENTS:
3207 break;
3208 default:
3209 /* Setup lttng message with no payload */
3210 ret = setup_lttng_msg(cmd_ctx, 0);
3211 if (ret < 0) {
3212 /* This label does not try to unlock the session */
3213 goto init_setup_error;
3214 }
3215 }
3216
3217 /* Commands that DO NOT need a session. */
3218 switch (cmd_ctx->lsm->cmd_type) {
54d01ffb 3219 case LTTNG_CREATE_SESSION:
2e09ba09 3220 case LTTNG_CALIBRATE:
54d01ffb
DG		 3221 case LTTNG_LIST_SESSIONS:
3222 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3223 need_tracing_session = 0;
54d01ffb
DG		 3224 break;
3225 default:
3226 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3227 session_lock_list();
54d01ffb 3228 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3229 session_unlock_list();
54d01ffb
DG		 3230 if (cmd_ctx->session == NULL) {
3231 if (cmd_ctx->lsm->session.name != NULL) {
3232 ret = LTTCOMM_SESS_NOT_FOUND;
3233 } else {
3234 /* If no session name specified */
3235 ret = LTTCOMM_SELECT_SESS;
3236 }
3237 goto error;
3238 } else {
3239 /* Acquire lock for the session */
3240 session_lock(cmd_ctx->session);
3241 }
3242 break;
3243 }
b389abbe 3244
2e09ba09
MD		 3245 if (!need_domain) {
3246 goto skip_domain;
3247 }
54d01ffb
DG		 3248 /*
3249 * Check domain type for specific "pre-action".
3250 */
3251 switch (cmd_ctx->lsm->domain.type) {
3252 case LTTNG_DOMAIN_KERNEL:
d1f1c568
DG		 3253 if (!is_root) {
3254 ret = LTTCOMM_KERN_NA;
3255 goto error;
3256 }
3257
54d01ffb
DG		 3258 /* Kernel tracer check */
3259 if (kernel_tracer_fd == 0) {
3260 /* Basically, load kernel tracer modules */
096102bd
DG		 3261 ret = init_kernel_tracer();
3262 if (ret != 0) {
54d01ffb
DG		 3263 goto error;
3264 }
3265 }
5eb91c98 3266
54d01ffb 3267 /* Need a session for kernel command */
44d3bd01 3268 if (need_tracing_session) {
54d01ffb 3269 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 3270 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3271 if (ret < 0) {
54d01ffb 3272 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3273 goto error;
3274 }
b389abbe 3275 }
7d29a247 3276
54d01ffb 3277 /* Start the kernel consumer daemon */
3bd1e081
MD		 3278 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3279 if (kconsumer_data.pid == 0 &&
54d01ffb 3280 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3281 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3282 ret = start_consumerd(&kconsumer_data);
7d29a247 3283 if (ret < 0) {
54d01ffb
DG		 3284 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3285 goto error;
950131af 3286 }
3ff2ecac
MD		 3287 } else {
3288 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3289 }
0d0c377a 3290 }
54d01ffb 3291 break;
2bdd86d4 3292 case LTTNG_DOMAIN_UST:
44d3bd01 3293 {
44d3bd01 3294 if (need_tracing_session) {
f6a9efaa 3295 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3296 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3297 &cmd_ctx->lsm->domain);
44d3bd01
DG		 3298 if (ret != LTTCOMM_OK) {
3299 goto error;
3300 }
3301 }
7753dea8
MD		 3302 /* Start the UST consumer daemons */
3303 /* 64-bit */
3304 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3305 if (consumerd64_bin[0] != '\0' &&
7753dea8 3306 ustconsumer64_data.pid == 0 &&
2bdd86d4 3307 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3308 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3309 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3310 if (ret < 0) {
7753dea8
MD		 3311 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3312 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3313 goto error;
3314 }
48842b30 3315
7753dea8 3316 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3317 } else {
7753dea8
MD		 3318 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3319 }
3320 /* 32-bit */
fc7a59ce 3321 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3322 ustconsumer32_data.pid == 0 &&
3323 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3324 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3325 ret = start_consumerd(&ustconsumer32_data);
3326 if (ret < 0) {
3327 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3328 ust_consumerd32_fd = -EINVAL;
3329 goto error;
3330 }
3331 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3332 } else {
3333 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3334 }
44d3bd01
DG		 3335 }
3336 break;
48842b30 3337 }
54d01ffb 3338 default:
54d01ffb
DG		 3339 break;
3340 }
2e09ba09 3341skip_domain:
33a2b854 3342
8e0af1b4
MD		 3343 /*
3344 * Check that the UID or GID match that of the tracing session.
3345 * The root user can interact with all sessions.
3346 */
3347 if (need_tracing_session) {
3348 if (!session_access_ok(cmd_ctx->session,
730389d9
DG		 3349 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3350 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
8e0af1b4
MD		 3351 ret = LTTCOMM_EPERM;
3352 goto error;
3353 }
3354 }
3355
54d01ffb
DG		 3356 /* Process by command type */
3357 switch (cmd_ctx->lsm->cmd_type) {
3358 case LTTNG_ADD_CONTEXT:
3359 {
3360 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3361 cmd_ctx->lsm->u.context.channel_name,
3362 cmd_ctx->lsm->u.context.event_name,
3363 &cmd_ctx->lsm->u.context.ctx);
3364 break;
3365 }
3366 case LTTNG_DISABLE_CHANNEL:
3367 {
3368 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3369 cmd_ctx->lsm->u.disable.channel_name);
3370 break;
3371 }
3372 case LTTNG_DISABLE_EVENT:
3373 {
3374 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3375 cmd_ctx->lsm->u.disable.channel_name,
3376 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3377 break;
3378 }
54d01ffb
DG		 3379 case LTTNG_DISABLE_ALL_EVENT:
3380 {
2bdd86d4 3381 DBG("Disabling all events");
54d01ffb
DG		 3382
3383 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3384 cmd_ctx->lsm->u.disable.channel_name);
3385 break;
3386 }
3387 case LTTNG_ENABLE_CHANNEL:
3388 {
aea829b3 3389 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3390 &cmd_ctx->lsm->u.channel.chan);
3391 break;
3392 }
3393 case LTTNG_ENABLE_EVENT:
3394 {
3395 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3396 cmd_ctx->lsm->u.enable.channel_name,
3397 &cmd_ctx->lsm->u.enable.event);
3398 break;
3399 }
3400 case LTTNG_ENABLE_ALL_EVENT:
3401 {
2bdd86d4 3402 DBG("Enabling all events");
54d01ffb
DG		 3403
3404 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3405 cmd_ctx->lsm->u.enable.channel_name,
3406 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3407 break;
3408 }
052da939 3409 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3410 {
9f19cc17 3411 struct lttng_event *events;
54d01ffb 3412 ssize_t nb_events;
052da939 3413
54d01ffb
DG		 3414 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3415 if (nb_events < 0) {
3416 ret = -nb_events;
3417 goto error;
2ef84c95
DG		 3418 }
3419
3420 /*
3421 * Setup lttng message with payload size set to the event list size in
3422 * bytes and then copy list into the llm payload.
3423 */
052da939 3424 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3425 if (ret < 0) {
052da939 3426 free(events);
2ef84c95
DG		 3427 goto setup_error;
3428 }
3429
3430 /* Copy event list into message payload */
9f19cc17 3431 memcpy(cmd_ctx->llm->payload, events,
052da939 3432 sizeof(struct lttng_event) * nb_events);
2ef84c95 3433
9f19cc17 3434 free(events);
2ef84c95
DG		 3435
3436 ret = LTTCOMM_OK;
3437 break;
3438 }
f3ed775e 3439 case LTTNG_START_TRACE:
8c0faa1d 3440 {
54d01ffb 3441 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3442 break;
3443 }
f3ed775e 3444 case LTTNG_STOP_TRACE:
8c0faa1d 3445 {
54d01ffb 3446 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3447 break;
3448 }
5e16da05
MD		 3449 case LTTNG_CREATE_SESSION:
3450 {
54d01ffb 3451 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3452 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
5e16da05
MD		 3453 break;
3454 }
3455 case LTTNG_DESTROY_SESSION:
3456 {
54d01ffb
DG		 3457 ret = cmd_destroy_session(cmd_ctx->session,
3458 cmd_ctx->lsm->session.name);
5461b305 3459 break;
5e16da05 3460 }
9f19cc17 3461 case LTTNG_LIST_DOMAINS:
5e16da05 3462 {
54d01ffb
DG		 3463 ssize_t nb_dom;
3464 struct lttng_domain *domains;
5461b305 3465
54d01ffb
DG		 3466 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3467 if (nb_dom < 0) {
3468 ret = -nb_dom;
3469 goto error;
ce3d728c 3470 }
520ff687 3471
54d01ffb 3472 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3473 if (ret < 0) {
3474 goto setup_error;
520ff687 3475 }
57167058 3476
54d01ffb
DG		 3477 /* Copy event list into message payload */
3478 memcpy(cmd_ctx->llm->payload, domains,
3479 nb_dom * sizeof(struct lttng_domain));
3480
3481 free(domains);
5e16da05 3482
5461b305 3483 ret = LTTCOMM_OK;
5e16da05
MD		 3484 break;
3485 }
9f19cc17 3486 case LTTNG_LIST_CHANNELS:
5e16da05 3487 {
54d01ffb
DG		 3488 size_t nb_chan;
3489 struct lttng_channel *channels;
3490
b551a063
DG		 3491 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3492 cmd_ctx->session, &channels);
54d01ffb
DG		 3493 if (nb_chan < 0) {
3494 ret = -nb_chan;
3495 goto error;
5461b305 3496 }
ca95a216 3497
54d01ffb 3498 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3499 if (ret < 0) {
3500 goto setup_error;
3501 }
9f19cc17 3502
54d01ffb
DG		 3503 /* Copy event list into message payload */
3504 memcpy(cmd_ctx->llm->payload, channels,
3505 nb_chan * sizeof(struct lttng_channel));
3506
3507 free(channels);
9f19cc17
DG		 3508
3509 ret = LTTCOMM_OK;
5461b305 3510 break;
5e16da05 3511 }
9f19cc17 3512 case LTTNG_LIST_EVENTS:
5e16da05 3513 {
b551a063 3514 ssize_t nb_event;
684d34d2 3515 struct lttng_event *events = NULL;
9f19cc17 3516
b551a063 3517 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3518 cmd_ctx->lsm->u.list.channel_name, &events);
3519 if (nb_event < 0) {
3520 ret = -nb_event;
3521 goto error;
5461b305 3522 }
ca95a216 3523
54d01ffb 3524 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3525 if (ret < 0) {
3526 goto setup_error;
3527 }
9f19cc17 3528
54d01ffb
DG		 3529 /* Copy event list into message payload */
3530 memcpy(cmd_ctx->llm->payload, events,
3531 nb_event * sizeof(struct lttng_event));
9f19cc17 3532
54d01ffb 3533 free(events);
9f19cc17
DG		 3534
3535 ret = LTTCOMM_OK;
5461b305 3536 break;
5e16da05
MD		 3537 }
3538 case LTTNG_LIST_SESSIONS:
3539 {
8e0af1b4 3540 unsigned int nr_sessions;
5461b305 3541
8e0af1b4 3542 session_lock_list();
730389d9
DG		 3543 nr_sessions = lttng_sessions_count(
3544 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3545 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
d32fb093 3546
8e0af1b4 3547 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3548 if (ret < 0) {
54d01ffb 3549 session_unlock_list();
5461b305 3550 goto setup_error;
e065084a 3551 }
5e16da05 3552
6c9cc2ab 3553 /* Filled the session array */
8e0af1b4 3554 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
730389d9
DG		 3555 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3556 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
6c9cc2ab 3557
54d01ffb 3558 session_unlock_list();
5e16da05 3559
5461b305 3560 ret = LTTCOMM_OK;
5e16da05
MD		 3561 break;
3562 }
d0254c7c
MD		 3563 case LTTNG_CALIBRATE:
3564 {
54d01ffb
DG		 3565 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3566 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3567 break;
3568 }
d9800920
DG		 3569 case LTTNG_REGISTER_CONSUMER:
3570 {
54d01ffb
DG		 3571 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3572 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3573 break;
3574 }
5e16da05 3575 default:
5e16da05 3576 ret = LTTCOMM_UND;
5461b305 3577 break;
fac6795d
DG		 3578 }
3579
5461b305 3580error:
5461b305
DG		 3581 if (cmd_ctx->llm == NULL) {
3582 DBG("Missing llm structure. Allocating one.");
894be886 3583 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3584 goto setup_error;
3585 }
3586 }
54d01ffb 3587 /* Set return code */
5461b305 3588 cmd_ctx->llm->ret_code = ret;
5461b305 3589setup_error:
b5541356 3590 if (cmd_ctx->session) {
54d01ffb 3591 session_unlock(cmd_ctx->session);
b5541356 3592 }
54d01ffb 3593init_setup_error:
8028d920 3594 return ret;
fac6795d
DG		 3595}
3596
1d4b027a 3597/*
d063d709
DG		 3598 * This thread manage all clients request using the unix client socket for
3599 * communication.
1d4b027a
DG		 3600 */
3601static void *thread_manage_clients(void *data)
3602{
5eb91c98
DG		 3603 int sock = 0, ret, i, pollfd;
3604 uint32_t revents, nb_fd;
273ea72c 3605 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3606 struct lttng_poll_event events;
1d4b027a
DG		 3607
3608 DBG("[thread] Manage client started");
3609
f6a9efaa
DG		 3610 rcu_register_thread();
3611
1d4b027a
DG		 3612 ret = lttcomm_listen_unix_sock(client_sock);
3613 if (ret < 0) {
3614 goto error;
3615 }
3616
5eb91c98
DG		 3617 /*
3618 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3619 * more will be added to this poll set.
3620 */
3621 ret = create_thread_poll_set(&events, 2);
3622 if (ret < 0) {
3623 goto error;
3624 }
273ea72c 3625
5eb91c98
DG		 3626 /* Add the application registration socket */
3627 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3628 if (ret < 0) {
3629 goto error;
3630 }
273ea72c 3631
bbd973c2
DG		 3632 /*
3633 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3634 */
3635 if (opt_sig_parent) {
8db8d1dc 3636 kill(ppid, SIGUSR1);
1d4b027a
DG		 3637 }
3638
3639 while (1) {
1d4b027a 3640 DBG("Accepting client command ...");
273ea72c 3641
5eb91c98
DG		 3642 nb_fd = LTTNG_POLL_GETNB(&events);
3643
273ea72c 3644 /* Inifinite blocking call, waiting for transmission */
88f2b785 3645 restart:
5eb91c98 3646 ret = lttng_poll_wait(&events, -1);
273ea72c 3647 if (ret < 0) {
88f2b785
MD		 3648 /*
3649 * Restart interrupted system call.
3650 */
3651 if (errno == EINTR) {
3652 goto restart;
3653 }
273ea72c
DG		 3654 goto error;
3655 }
3656
5eb91c98
DG		 3657 for (i = 0; i < nb_fd; i++) {
3658 /* Fetch once the poll data */
3659 revents = LTTNG_POLL_GETEV(&events, i);
3660 pollfd = LTTNG_POLL_GETFD(&events, i);
3661
3662 /* Thread quit pipe has been closed. Killing thread. */
3663 ret = check_thread_quit_pipe(pollfd, revents);
3664 if (ret) {
3665 goto error;
3666 }
3667
3668 /* Event on the registration socket */
3669 if (pollfd == client_sock) {
3670 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3671 ERR("Client socket poll error");
3672 goto error;
3673 }
3674 }
3675 }
3676
3677 DBG("Wait for client response");
3678
3679 sock = lttcomm_accept_unix_sock(client_sock);
3680 if (sock < 0) {
273ea72c 3681 goto error;
273ea72c
DG		 3682 }
3683
be040666
DG		 3684 /* Set socket option for credentials retrieval */
3685 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3686 if (ret < 0) {
3687 goto error;
3688 }
3689
5eb91c98 3690 /* Allocate context command to process the client request */
ba7f0ae5 3691 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3692 if (cmd_ctx == NULL) {
ba7f0ae5 3693 perror("zmalloc cmd_ctx");
1d4b027a 3694 goto error;
5eb91c98 3695 }
1d4b027a 3696
5eb91c98 3697 /* Allocate data buffer for reception */
ba7f0ae5 3698 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3699 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3700 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3701 goto error;
3702 }
1d4b027a 3703
5eb91c98
DG		 3704 cmd_ctx->llm = NULL;
3705 cmd_ctx->session = NULL;
1d4b027a 3706
5eb91c98
DG		 3707 /*
3708 * Data is received from the lttng client. The struct
3709 * lttcomm_session_msg (lsm) contains the command and data request of
3710 * the client.
3711 */
3712 DBG("Receiving data from client ...");
be040666
DG		 3713 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3714 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG		 3715 if (ret <= 0) {
3716 DBG("Nothing recv() from client... continuing");
3717 close(sock);
3718 free(cmd_ctx);
3719 continue;
3720 }
1d4b027a 3721
5eb91c98
DG		 3722 // TODO: Validate cmd_ctx including sanity check for
3723 // security purpose.
f7776ea7 3724
f6a9efaa 3725 rcu_thread_online();
5eb91c98
DG		 3726 /*
3727 * This function dispatch the work to the kernel or userspace tracer
3728 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3729 * informations for the client. The command context struct contains
3730 * everything this function may needs.
3731 */
3732 ret = process_client_msg(cmd_ctx);
f6a9efaa 3733 rcu_thread_offline();
5eb91c98 3734 if (ret < 0) {
bbd973c2 3735 /*
5eb91c98 3736 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3737 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3738 * (ENOMEM). Error detected but still accept command.
bbd973c2 3739 */
bbd973c2 3740 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3741 continue;
3742 }
d6e4fca4 3743
54d01ffb
DG		 3744 DBG("Sending response (size: %d, retcode: %s)",
3745 cmd_ctx->lttng_msg_size,
9a745bc7 3746 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3747 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3748 if (ret < 0) {
3749 ERR("Failed to send data back to client");
bbd973c2 3750 }
1d4b027a 3751
5eb91c98 3752 /* End of transmission */
273ea72c 3753 close(sock);
be040666
DG		 3754
3755 clean_command_ctx(&cmd_ctx);
273ea72c
DG		 3756 }
3757
5eb91c98
DG		 3758error:
3759 DBG("Client thread dying");
273ea72c 3760 unlink(client_unix_sock_path);
5eb91c98
DG		 3761 close(client_sock);
3762 close(sock);
273ea72c 3763
5eb91c98 3764 lttng_poll_clean(&events);
a2fb29a5 3765 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3766
3767 rcu_unregister_thread();
1d4b027a
DG		 3768 return NULL;
3769}
3770
3771
fac6795d
DG		 3772/*
3773 * usage function on stderr
3774 */
3775static void usage(void)
3776{
b716ce68 3777 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3778 fprintf(stderr, " -h, --help Display this usage.\n");
3779 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3780 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3781 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3782 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3783 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3784 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3785 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3786 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3787 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3788 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3789 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3790 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3791 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3792 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3793 fprintf(stderr, " -V, --version Show version number.\n");
3794 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3795 fprintf(stderr, " -q, --quiet No output at all.\n");
3796 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3797 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3798 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3799}
3800
3801/*
3802 * daemon argument parsing
3803 */
3804static int parse_args(int argc, char **argv)
3805{
3806 int c;
3807
3808 static struct option long_options[] = {
3809 { "client-sock", 1, 0, 'c' },
3810 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3811 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3812 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3813 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3814 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3815 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3816 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3817 { "consumerd32-path", 1, 0, 'u' },
3818 { "consumerd32-libdir", 1, 0, 'U' },
3819 { "consumerd64-path", 1, 0, 't' },
3820 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3821 { "daemonize", 0, 0, 'd' },
5b8719f5 3822 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3823 { "help", 0, 0, 'h' },
3824 { "group", 1, 0, 'g' },
3825 { "version", 0, 0, 'V' },
75462a81 3826 { "quiet", 0, 0, 'q' },
3f9947db 3827 { "verbose", 0, 0, 'v' },
3bd1e081 3828 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3829 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3830 { NULL, 0, 0, 0 }
3831 };
3832
3833 while (1) {
3834 int option_index = 0;
4fba7219 3835 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3836 long_options, &option_index);
fac6795d
DG		 3837 if (c == -1) {
3838 break;
3839 }
3840
3841 switch (c) {
3842 case 0:
3843 fprintf(stderr, "option %s", long_options[option_index].name);
3844 if (optarg) {
3845 fprintf(stderr, " with arg %s\n", optarg);
3846 }
3847 break;
b716ce68 3848 case 'c':
fac6795d
DG		 3849 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3850 break;
3851 case 'a':
3852 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3853 break;
3854 case 'd':
3855 opt_daemon = 1;
3856 break;
3857 case 'g':
fb09408a 3858 opt_tracing_group = optarg;
fac6795d
DG		 3859 break;
3860 case 'h':
3861 usage();
3862 exit(EXIT_FAILURE);
3863 case 'V':
3864 fprintf(stdout, "%s\n", VERSION);
3865 exit(EXIT_SUCCESS);
5b8719f5
DG		 3866 case 'S':
3867 opt_sig_parent = 1;
3868 break;
d6f42150 3869 case 'E':
3bd1e081 3870 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3871 break;
3872 case 'C':
3bd1e081
MD		 3873 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3874 break;
3875 case 'F':
7753dea8 3876 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3877 break;
3878 case 'D':
7753dea8
MD		 3879 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3880 break;
3881 case 'H':
3882 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3883 break;
3884 case 'G':
3885 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3886 break;
4fba7219
DG		 3887 case 'N':
3888 opt_no_kernel = 1;
3889 break;
75462a81
DG		 3890 case 'q':
3891 opt_quiet = 1;
3892 break;
3f9947db 3893 case 'v':
53086306
DG		 3894 /* Verbose level can increase using multiple -v */
3895 opt_verbose += 1;
3f9947db 3896 break;
31f73cc9 3897 case 'Z':
3bd1e081 3898 opt_verbose_consumer += 1;
31f73cc9 3899 break;
fb09408a 3900 case 'u':
fc7a59ce 3901 consumerd32_bin= optarg;
ebaeda94
MD		 3902 break;
3903 case 'U':
3904 consumerd32_libdir = optarg;
7753dea8
MD		 3905 break;
3906 case 't':
fc7a59ce 3907 consumerd64_bin = optarg;
ebaeda94
MD		 3908 break;
3909 case 'T':
3910 consumerd64_libdir = optarg;
fb09408a 3911 break;
fac6795d
DG		 3912 default:
3913 /* Unknown option or other error.
3914 * Error is printed by getopt, just return */
3915 return -1;
3916 }
3917 }
3918
3919 return 0;
3920}
3921
3922/*
d063d709 3923 * Creates the two needed socket by the daemon.
d6f42150
DG		 3924 * apps_sock - The communication socket for all UST apps.
3925 * client_sock - The communication of the cli tool (lttng).
fac6795d 3926 */
cf3af59e 3927static int init_daemon_socket(void)
fac6795d
DG		 3928{
3929 int ret = 0;
3930 mode_t old_umask;
3931
3932 old_umask = umask(0);
3933
3934 /* Create client tool unix socket */
d6f42150
DG		 3935 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3936 if (client_sock < 0) {
3937 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3938 ret = -1;
3939 goto end;
3940 }
3941
3942 /* File permission MUST be 660 */
3943 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3944 if (ret < 0) {
d6f42150 3945 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3946 perror("chmod");
3947 goto end;
3948 }
3949
3950 /* Create the application unix socket */
d6f42150
DG		 3951 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3952 if (apps_sock < 0) {
3953 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3954 ret = -1;
3955 goto end;
3956 }
3957
d6f42150 3958 /* File permission MUST be 666 */
54d01ffb
DG		 3959 ret = chmod(apps_unix_sock_path,
3960 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3961 if (ret < 0) {
d6f42150 3962 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3963 perror("chmod");
3964 goto end;
3965 }
3966
3967end:
3968 umask(old_umask);
3969 return ret;
3970}
3971
3972/*
54d01ffb
DG		 3973 * Check if the global socket is available, and if a daemon is answering at the
3974 * other side. If yes, error is returned.
fac6795d 3975 */
cf3af59e 3976static int check_existing_daemon(void)
fac6795d 3977{
7d8234d9 3978 /* Is there anybody out there ? */
099e26bd 3979 if (lttng_session_daemon_alive()) {
7d8234d9 3980 return -EEXIST;
099e26bd 3981 }
b09c7c76
DG		 3982
3983 return 0;
fac6795d
DG		 3984}
3985
fac6795d 3986/*
d063d709 3987 * Set the tracing group gid onto the client socket.
5e16da05 3988 *
d063d709 3989 * Race window between mkdir and chown is OK because we are going from more
d1613cf5 3990 * permissive (root.root) to less permissive (root.tracing).
fac6795d 3991 */
be040666 3992static int set_permissions(char *rundir)
fac6795d
DG		 3993{
3994 int ret;
996b65c8 3995 gid_t gid;
fac6795d 3996
996b65c8
MD		 3997 gid = allowed_group();
3998 if (gid < 0) {
be040666
DG		 3999 WARN("No tracing group detected");
4000 ret = 0;
fac6795d
DG		 4001 goto end;
4002 }
4003
d6f42150 4004 /* Set lttng run dir */
be040666 4005 ret = chown(rundir, 0, gid);
d6f42150 4006 if (ret < 0) {
be040666 4007 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 4008 perror("chown");
4009 }
4010
d1613cf5
JN		 4011 /* Ensure tracing group can search the run dir */
4012 ret = chmod(rundir, S_IRWXU | S_IXGRP);
4013 if (ret < 0) {
4014 ERR("Unable to set permissions on %s", rundir);
4015 perror("chmod");
4016 }
4017
d6f42150 4018 /* lttng client socket path */
996b65c8 4019 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 4020 if (ret < 0) {
d6f42150
DG		 4021 ERR("Unable to set group on %s", client_unix_sock_path);
4022 perror("chown");
4023 }
4024
3bd1e081
MD		 4025 /* kconsumer error socket path */
4026 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 4027 if (ret < 0) {
3bd1e081
MD		 4028 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4029 perror("chown");
4030 }
4031
7753dea8
MD		 4032 /* 64-bit ustconsumer error socket path */
4033 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4034 if (ret < 0) {
4035 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4036 perror("chown");
4037 }
4038
4039 /* 32-bit ustconsumer compat32 error socket path */
4040 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 4041 if (ret < 0) {
7753dea8 4042 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 4043 perror("chown");
4044 }
4045
d6f42150 4046 DBG("All permissions are set");
e07ae692 4047
fac6795d
DG		 4048end:
4049 return ret;
4050}
4051
7a485870 4052/*
d063d709 4053 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 4054 */
4055static int create_kernel_poll_pipe(void)
4056{
730389d9
DG		 4057 int ret, i;
4058
4059 ret = pipe(kernel_poll_pipe);
4060 if (ret < 0) {
4061 PERROR("kernel poll pipe");
4062 goto error;
4063 }
4064
4065 for (i = 0; i < 2; i++) {
4066 ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC);
4067 if (ret < 0) {
4068 PERROR("fcntl kernel_poll_pipe");
4069 goto error;
4070 }
4071 }
4072
4073error:
4074 return ret;
7a485870
DG		 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{
730389d9
DG		 4082 int ret, i;
4083
4084 ret = pipe(apps_cmd_pipe);
4085 if (ret < 0) {
4086 PERROR("apps cmd pipe");
4087 goto error;
4088 }
4089
4090 for (i = 0; i < 2; i++) {
4091 ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC);
4092 if (ret < 0) {
4093 PERROR("fcntl apps_cmd_pipe");
4094 goto error;
4095 }
4096 }
4097
4098error:
4099 return ret;
099e26bd
DG		 4100}
4101
d6f42150 4102/*
d063d709 4103 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4104 */
67e40797 4105static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 4106{
4107 int ret;
4108
67e40797
DG		 4109 DBG3("Creating LTTng run directory: %s", rundir);
4110
d1613cf5 4111 ret = mkdir(rundir, S_IRWXU);
d6f42150 4112 if (ret < 0) {
b1f11e69 4113 if (errno != EEXIST) {
67e40797 4114 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4115 goto error;
4116 } else {
4117 ret = 0;
4118 }
d6f42150
DG		 4119 }
4120
4121error:
4122 return ret;
4123}
4124
4125/*
d063d709
DG		 4126 * Setup sockets and directory needed by the kconsumerd communication with the
4127 * session daemon.
d6f42150 4128 */
67e40797
DG		 4129static int set_consumer_sockets(struct consumer_data *consumer_data,
4130 const char *rundir)
d6f42150
DG		 4131{
4132 int ret;
67e40797 4133 char path[PATH_MAX];
d6f42150 4134
67e40797 4135 switch (consumer_data->type) {
7753dea8 4136 case LTTNG_CONSUMER_KERNEL:
60922cb0 4137 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD		 4138 break;
4139 case LTTNG_CONSUMER64_UST:
60922cb0 4140 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4141 break;
4142 case LTTNG_CONSUMER32_UST:
60922cb0 4143 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4144 break;
4145 default:
4146 ERR("Consumer type unknown");
4147 ret = -EINVAL;
4148 goto error;
d6f42150
DG		 4149 }
4150
67e40797
DG		 4151 DBG2("Creating consumer directory: %s", path);
4152
d1613cf5 4153 ret = mkdir(path, S_IRWXU);
d6f42150 4154 if (ret < 0) {
6beb2242 4155 if (errno != EEXIST) {
3bd1e081 4156 ERR("Failed to create %s", path);
6beb2242
DG		 4157 goto error;
4158 }
4159 ret = 0;
d6f42150
DG		 4160 }
4161
4162 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4163 consumer_data->err_sock =
4164 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4165 if (consumer_data->err_sock < 0) {
4166 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4167 ret = -1;
4168 goto error;
4169 }
4170
4171 /* File permission MUST be 660 */
3bd1e081 4172 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4173 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4174 if (ret < 0) {
3bd1e081 4175 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4176 PERROR("chmod");
d6f42150
DG		 4177 goto error;
4178 }
4179
4180error:
4181 return ret;
4182}
4183
fac6795d 4184/*
d063d709 4185 * Signal handler for the daemon
cf3af59e 4186 *
54d01ffb
DG		 4187 * Simply stop all worker threads, leaving main() return gracefully after
4188 * joining all threads and calling cleanup().
fac6795d
DG		 4189 */
4190static void sighandler(int sig)
4191{
4192 switch (sig) {
cf3af59e 4193 case SIGPIPE:
af87c45a 4194 DBG("SIGPIPE caught");
cf3af59e
MD		 4195 return;
4196 case SIGINT:
af87c45a 4197 DBG("SIGINT caught");
cf3af59e
MD		 4198 stop_threads();
4199 break;
4200 case SIGTERM:
af87c45a 4201 DBG("SIGTERM caught");
cf3af59e
MD		 4202 stop_threads();
4203 break;
4204 default:
4205 break;
fac6795d 4206 }
fac6795d
DG		 4207}
4208
4209/*
d063d709 4210 * Setup signal handler for :
1d4b027a 4211 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4212 */
1d4b027a 4213static int set_signal_handler(void)
fac6795d 4214{
1d4b027a
DG		 4215 int ret = 0;
4216 struct sigaction sa;
4217 sigset_t sigset;
fac6795d 4218
1d4b027a
DG		 4219 if ((ret = sigemptyset(&sigset)) < 0) {
4220 perror("sigemptyset");
4221 return ret;
4222 }
d6f42150 4223
1d4b027a
DG		 4224 sa.sa_handler = sighandler;
4225 sa.sa_mask = sigset;
4226 sa.sa_flags = 0;
4227 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4228 perror("sigaction");
4229 return ret;
d6f42150
DG		 4230 }
4231
1d4b027a
DG		 4232 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4233 perror("sigaction");
4234 return ret;
d6f42150 4235 }
aaf26714 4236
1d4b027a
DG		 4237 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4238 perror("sigaction");
4239 return ret;
8c0faa1d
DG		 4240 }
4241
1d4b027a
DG		 4242 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4243
4244 return ret;
fac6795d
DG		 4245}
4246
f3ed775e 4247/*
d063d709
DG		 4248 * Set open files limit to unlimited. This daemon can open a large number of
4249 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4250 */
4251static void set_ulimit(void)
4252{
4253 int ret;
4254 struct rlimit lim;
4255
a88df331 4256 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4257 lim.rlim_cur = 65535;
4258 lim.rlim_max = 65535;
4259
4260 ret = setrlimit(RLIMIT_NOFILE, &lim);
4261 if (ret < 0) {
4262 perror("failed to set open files limit");
4263 }
4264}
4265
fac6795d
DG		 4266/*
4267 * main
4268 */
4269int main(int argc, char **argv)
4270{
fac6795d
DG		 4271 int ret = 0;
4272 void *status;
b082db07 4273 const char *home_path;
fac6795d 4274
335a95b7
MD		 4275 init_kernel_workarounds();
4276
f6a9efaa
DG		 4277 rcu_register_thread();
4278
273ea72c 4279 /* Create thread quit pipe */
cf3af59e
MD		 4280 if ((ret = init_thread_quit_pipe()) < 0) {
4281 goto error;
273ea72c
DG		 4282 }
4283
7753dea8 4284 setup_consumerd_path();
fb09408a 4285
fac6795d
DG		 4286 /* Parse arguments */
4287 progname = argv[0];
4288 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4289 goto error;
fac6795d
DG		 4290 }
4291
4292 /* Daemonize */
4293 if (opt_daemon) {
53094c05
DG		 4294 ret = daemon(0, 0);
4295 if (ret < 0) {
4296 perror("daemon");
cf3af59e 4297 goto error;
53094c05 4298 }
fac6795d
DG		 4299 }
4300
4301 /* Check if daemon is UID = 0 */
4302 is_root = !getuid();
4303
fac6795d 4304 if (is_root) {
990570ed 4305 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG		 4306
4307 /* Create global run dir with root access */
4308 ret = create_lttng_rundir(rundir);
d6f42150 4309 if (ret < 0) {
cf3af59e 4310 goto error;
d6f42150
DG		 4311 }
4312
fac6795d 4313 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4314 snprintf(apps_unix_sock_path, PATH_MAX,
4315 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4316 }
4317
4318 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4319 snprintf(client_unix_sock_path, PATH_MAX,
4320 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4321 }
0fdd1e2c
DG		 4322
4323 /* Set global SHM for ust */
4324 if (strlen(wait_shm_path) == 0) {
4325 snprintf(wait_shm_path, PATH_MAX,
4326 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4327 }
67e40797
DG		 4328
4329 /* Setup kernel consumerd path */
4330 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 4331 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 4332 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4333 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG		 4334
4335 DBG2("Kernel consumer err path: %s",
4336 kconsumer_data.err_unix_sock_path);
4337 DBG2("Kernel consumer cmd path: %s",
4338 kconsumer_data.cmd_unix_sock_path);
fac6795d 4339 } else {
b082db07
DG		 4340 home_path = get_home_dir();
4341 if (home_path == NULL) {
273ea72c
DG		 4342 /* TODO: Add --socket PATH option */
4343 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4344 ret = -EPERM;
4345 goto error;
b082db07
DG		 4346 }
4347
67e40797
DG		 4348 /*
4349 * Create rundir from home path. This will create something like
4350 * $HOME/.lttng
4351 */
990570ed 4352 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG		 4353 if (ret < 0) {
4354 ret = -ENOMEM;
4355 goto error;
4356 }
4357
4358 ret = create_lttng_rundir(rundir);
4359 if (ret < 0) {
4360 goto error;
4361 }
4362
fac6795d 4363 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4364 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4365 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4366 }
4367
4368 /* Set the cli tool unix socket path */
4369 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4370 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4371 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4372 }
0fdd1e2c
DG		 4373
4374 /* Set global SHM for ust */
4375 if (strlen(wait_shm_path) == 0) {
4376 snprintf(wait_shm_path, PATH_MAX,
4377 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4378 }
fac6795d
DG		 4379 }
4380
847177cd
DG		 4381 DBG("Client socket path %s", client_unix_sock_path);
4382 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4383 DBG("LTTng run directory path: %s", rundir);
4384
4385 /* 32 bits consumerd path setup */
4386 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 4387 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 4388 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4389 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG		 4390
4391 DBG2("UST consumer 32 bits err path: %s",
4392 ustconsumer32_data.err_unix_sock_path);
4393 DBG2("UST consumer 32 bits cmd path: %s",
4394 ustconsumer32_data.cmd_unix_sock_path);
4395
4396 /* 64 bits consumerd path setup */
4397 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 4398 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 4399 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4400 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG		 4401
4402 DBG2("UST consumer 64 bits err path: %s",
4403 ustconsumer64_data.err_unix_sock_path);
4404 DBG2("UST consumer 64 bits cmd path: %s",
4405 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4406
273ea72c 4407 /*
7d8234d9 4408 * See if daemon already exist.
fac6795d 4409 */
7d8234d9 4410 if ((ret = check_existing_daemon()) < 0) {
75462a81 4411 ERR("Already running daemon.\n");
273ea72c 4412 /*
cf3af59e
MD		 4413 * We do not goto exit because we must not cleanup()
4414 * because a daemon is already running.
ab118b20 4415 */
cf3af59e 4416 goto error;
a88df331
DG		 4417 }
4418
54d01ffb 4419 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4420
4421 /*
4422 * These actions must be executed as root. We do that *after* setting up
4423 * the sockets path because we MUST make the check for another daemon using
4424 * those paths *before* trying to set the kernel consumer sockets and init
4425 * kernel tracer.
4426 */
4427 if (is_root) {
67e40797 4428 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4429 if (ret < 0) {
4430 goto exit;
4431 }
4432
a88df331 4433 /* Setup kernel tracer */
4fba7219
DG		 4434 if (!opt_no_kernel) {
4435 init_kernel_tracer();
4436 }
a88df331
DG		 4437
4438 /* Set ulimit for open files */
4439 set_ulimit();
fac6795d
DG		 4440 }
4441
67e40797
DG		 4442 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4443 if (ret < 0) {
4444 goto exit;
4445 }
4446
4447 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4448 if (ret < 0) {
4449 goto exit;
4450 }
4451
cf3af59e
MD		 4452 if ((ret = set_signal_handler()) < 0) {
4453 goto exit;
fac6795d
DG		 4454 }
4455
d6f42150 4456 /* Setup the needed unix socket */
cf3af59e
MD		 4457 if ((ret = init_daemon_socket()) < 0) {
4458 goto exit;
fac6795d
DG		 4459 }
4460
4461 /* Set credentials to socket */
be040666 4462 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4463 goto exit;
fac6795d
DG		 4464 }
4465
5b8719f5
DG		 4466 /* Get parent pid if -S, --sig-parent is specified. */
4467 if (opt_sig_parent) {
4468 ppid = getppid();
4469 }
4470
7a485870 4471 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4472 if ((ret = create_kernel_poll_pipe()) < 0) {
4473 goto exit;
7a485870
DG		 4474 }
4475
099e26bd
DG		 4476 /* Setup the thread apps communication pipe. */
4477 if ((ret = create_apps_cmd_pipe()) < 0) {
4478 goto exit;
4479 }
4480
4481 /* Init UST command queue. */
4482 cds_wfq_init(&ust_cmd_queue.queue);
4483
f6a9efaa
DG		 4484 /* Init UST app hash table */
4485 ust_app_ht_alloc();
4486
273ea72c 4487 /*
54d01ffb
DG		 4488 * Get session list pointer. This pointer MUST NOT be free(). This list is
4489 * statically declared in session.c
273ea72c 4490 */
54d01ffb 4491 session_list_ptr = session_get_list();
b5541356 4492
5eb91c98
DG		 4493 /* Set up max poll set size */
4494 lttng_poll_set_max_size();
4495
cf3af59e 4496 /* Create thread to manage the client socket */
099e26bd
DG		 4497 ret = pthread_create(&client_thread, NULL,
4498 thread_manage_clients, (void *) NULL);
cf3af59e 4499 if (ret != 0) {
099e26bd 4500 perror("pthread_create clients");
cf3af59e
MD		 4501 goto exit_client;
4502 }
fac6795d 4503
099e26bd
DG		 4504 /* Create thread to dispatch registration */
4505 ret = pthread_create(&dispatch_thread, NULL,
4506 thread_dispatch_ust_registration, (void *) NULL);
4507 if (ret != 0) {
4508 perror("pthread_create dispatch");
4509 goto exit_dispatch;
4510 }
4511
4512 /* Create thread to manage application registration. */
4513 ret = pthread_create(&reg_apps_thread, NULL,
4514 thread_registration_apps, (void *) NULL);
4515 if (ret != 0) {
4516 perror("pthread_create registration");
4517 goto exit_reg_apps;
4518 }
4519
cf3af59e 4520 /* Create thread to manage application socket */
54d01ffb
DG		 4521 ret = pthread_create(&apps_thread, NULL,
4522 thread_manage_apps, (void *) NULL);
cf3af59e 4523 if (ret != 0) {
099e26bd 4524 perror("pthread_create apps");
cf3af59e
MD		 4525 goto exit_apps;
4526 }
fac6795d 4527
cf3af59e 4528 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4529 ret = pthread_create(&kernel_thread, NULL,
4530 thread_manage_kernel, (void *) NULL);
cf3af59e 4531 if (ret != 0) {
099e26bd 4532 perror("pthread_create kernel");
cf3af59e
MD		 4533 goto exit_kernel;
4534 }
7a485870 4535
cf3af59e
MD		 4536 ret = pthread_join(kernel_thread, &status);
4537 if (ret != 0) {
4538 perror("pthread_join");
4539 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4540 }
4541
cf3af59e
MD		 4542exit_kernel:
4543 ret = pthread_join(apps_thread, &status);
4544 if (ret != 0) {
4545 perror("pthread_join");
4546 goto error; /* join error, exit without cleanup */
4547 }
fac6795d 4548
cf3af59e 4549exit_apps:
099e26bd
DG		 4550 ret = pthread_join(reg_apps_thread, &status);
4551 if (ret != 0) {
4552 perror("pthread_join");
4553 goto error; /* join error, exit without cleanup */
4554 }
4555
4556exit_reg_apps:
4557 ret = pthread_join(dispatch_thread, &status);
4558 if (ret != 0) {
4559 perror("pthread_join");
4560 goto error; /* join error, exit without cleanup */
4561 }
4562
4563exit_dispatch:
cf3af59e
MD		 4564 ret = pthread_join(client_thread, &status);
4565 if (ret != 0) {
4566 perror("pthread_join");
4567 goto error; /* join error, exit without cleanup */
4568 }
4569
3bd1e081 4570 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4571 if (ret != 0) {
3bd1e081 4572 perror("join_consumer");
cf3af59e
MD		 4573 goto error; /* join error, exit without cleanup */
4574 }
a88df331 4575
cf3af59e 4576exit_client:
a88df331 4577exit:
cf3af59e
MD		 4578 /*
4579 * cleanup() is called when no other thread is running.
4580 */
f6a9efaa 4581 rcu_thread_online();
cf3af59e 4582 cleanup();
f6a9efaa
DG		 4583 rcu_thread_offline();
4584 rcu_unregister_thread();
67e40797 4585 if (!ret) {
cf3af59e 4586 exit(EXIT_SUCCESS);
67e40797 4587 }
cf3af59e 4588error:
5e16da05 4589 exit(EXIT_FAILURE);
fac6795d 4590}
LTTng 2.0 tools and control repository
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