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Add UST test ust-nprocesses
[lttng-tools.git] / lttng-sessiond / main.c
CommitLineData
826d496d
MD		 1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
54d01ffb
DG		 5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG		 9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG		 14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG		 17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG		 26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG		 33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG		 36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
bec39940 42#include <lttng-ht.h>
e88129fc 43#include <lttng-sessiond-comm.h>
3bd1e081 44#include <lttng/lttng-consumer.h>
2bdd86d4 45
1e307fab 46#include <lttngerr.h>
0857097f 47#include "common/runas.h"
fac6795d 48
54d01ffb 49#include "channel.h"
5eb91c98 50#include "compat/poll.h"
099e26bd 51#include "context.h"
54d01ffb 52#include "event.h"
099e26bd 53#include "futex.h"
4771f025 54#include "kernel.h"
32258573 55#include "lttng-sessiond.h"
0fdd1e2c 56#include "shm.h"
56fff090 57#include "ust-app.h"
1e307fab 58#include "ust-ctl.h"
8e68d1c8 59#include "utils.h"
fac6795d 60
ebaeda94
MD		 61#define CONSUMERD_FILE "lttng-consumerd"
62
3bd1e081
MD		 63struct consumer_data {
64 enum lttng_consumer_type type;
65
66 pthread_t thread; /* Worker thread interacting with the consumer */
67 sem_t sem;
68
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex;
71 pid_t pid;
72
73 int err_sock;
74 int cmd_sock;
75
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path[PATH_MAX];
78 char cmd_unix_sock_path[PATH_MAX];
79};
80
75462a81 81/* Const values */
686204ab 82const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 83const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD		 84const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
85const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
86
fac6795d 87/* Variables */
1d4b027a 88int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 89int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 90int opt_quiet; /* Not static for lttngerr.h */
d063d709 91
fac6795d
DG		 92const char *progname;
93const char *opt_tracing_group;
5b8719f5 94static int opt_sig_parent;
fac6795d 95static int opt_daemon;
4fba7219 96static int opt_no_kernel;
fac6795d 97static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 98static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 99static char *rundir;
3bd1e081
MD		 100
101/* Consumer daemon specific control data */
102static struct consumer_data kconsumer_data = {
103 .type = LTTNG_CONSUMER_KERNEL,
7753dea8
MD		 104 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
105 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 106};
7753dea8
MD		 107static struct consumer_data ustconsumer64_data = {
108 .type = LTTNG_CONSUMER64_UST,
109 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
110 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
111};
112static struct consumer_data ustconsumer32_data = {
113 .type = LTTNG_CONSUMER32_UST,
114 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
115 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 116};
117
099e26bd 118static int dispatch_thread_exit;
fac6795d 119
54d01ffb
DG		 120/* Global application Unix socket path */
121static char apps_unix_sock_path[PATH_MAX];
122/* Global client Unix socket path */
123static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 124/* global wait shm path for UST */
125static char wait_shm_path[PATH_MAX];
fac6795d 126
1d4b027a 127/* Sockets and FDs */
d6f42150
DG		 128static int client_sock;
129static int apps_sock;
20fe2104 130static int kernel_tracer_fd;
7a485870 131static int kernel_poll_pipe[2];
1d4b027a 132
273ea72c
DG		 133/*
134 * Quit pipe for all threads. This permits a single cancellation point
135 * for all threads when receiving an event on the pipe.
136 */
137static int thread_quit_pipe[2];
138
099e26bd
DG		 139/*
140 * This pipe is used to inform the thread managing application communication
141 * that a command is queued and ready to be processed.
142 */
143static int apps_cmd_pipe[2];
144
1d4b027a 145/* Pthread, Mutexes and Semaphores */
1d4b027a 146static pthread_t apps_thread;
099e26bd 147static pthread_t reg_apps_thread;
1d4b027a 148static pthread_t client_thread;
7a485870 149static pthread_t kernel_thread;
099e26bd 150static pthread_t dispatch_thread;
5eb91c98 151
fac6795d 152
099e26bd
DG		 153/*
154 * UST registration command queue. This queue is tied with a futex and uses a N
155 * wakers / 1 waiter implemented and detailed in futex.c/.h
156 *
157 * The thread_manage_apps and thread_dispatch_ust_registration interact with
158 * this queue and the wait/wake scheme.
159 */
160static struct ust_cmd_queue ust_cmd_queue;
161
b5541356
DG		 162/*
163 * Pointer initialized before thread creation.
164 *
165 * This points to the tracing session list containing the session count and a
166 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
167 * MUST NOT be taken if you call a public function in session.c.
04ea676f 168 *
d063d709 169 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 170 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 171 */
172static struct ltt_session_list *session_list_ptr;
173
7753dea8
MD		 174int ust_consumerd64_fd = -1;
175int ust_consumerd32_fd = -1;
176
fb6f1fa2
YB		 177static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
178static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
179static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
180static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD		 181
182static
7753dea8 183void setup_consumerd_path(void)
fb09408a 184{
fc7a59ce 185 const char *bin, *libdir;
fb09408a 186
7753dea8
MD		 187 /*
188 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 189 * native architecture size consumer if CONFIG_CONSUMER*_PATH
190 * has not been defined.
7753dea8 191 */
ebaeda94 192#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 193 if (!consumerd32_bin[0]) {
194 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 195 }
196 if (!consumerd32_libdir[0]) {
197 consumerd32_libdir = INSTALL_LIB_PATH;
198 }
199#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 200 if (!consumerd64_bin[0]) {
201 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 202 }
ebaeda94
MD		 203 if (!consumerd64_libdir[0]) {
204 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 205 }
206#else
207#error "Unknown bitness"
208#endif
209
fb09408a
MD		 210 /*
211 * runtime env. var. overrides the build default.
212 */
fc7a59ce
AM		 213 bin = getenv("LTTNG_CONSUMERD32_BIN");
214 if (bin) {
215 consumerd32_bin = bin;
7753dea8 216 }
fc7a59ce
AM		 217 bin = getenv("LTTNG_CONSUMERD64_BIN");
218 if (bin) {
219 consumerd64_bin = bin;
ebaeda94
MD		 220 }
221 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
222 if (libdir) {
223 consumerd32_libdir = libdir;
224 }
225 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
226 if (libdir) {
227 consumerd64_libdir = libdir;
fb09408a
MD		 228 }
229}
230
5eb91c98
DG		 231/*
232 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
233 */
234static int create_thread_poll_set(struct lttng_poll_event *events,
235 unsigned int size)
236{
237 int ret;
238
239 if (events == NULL || size == 0) {
240 ret = -1;
241 goto error;
242 }
243
244 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
245 if (ret < 0) {
246 goto error;
247 }
248
249 /* Add quit pipe */
250 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
251 if (ret < 0) {
252 goto error;
253 }
254
255 return 0;
256
257error:
258 return ret;
259}
260
261/*
262 * Check if the thread quit pipe was triggered.
263 *
264 * Return 1 if it was triggered else 0;
265 */
266static int check_thread_quit_pipe(int fd, uint32_t events)
267{
268 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
269 return 1;
270 }
271
272 return 0;
273}
274
0fdd1e2c
DG		 275/*
276 * Remove modules in reverse load order.
277 */
278static int modprobe_remove_kernel_modules(void)
279{
280 int ret = 0, i;
281 char modprobe[256];
282
283 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
284 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 285 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG		 286 kernel_modules_list[i].name);
287 if (ret < 0) {
24b487b8 288 perror("snprintf modprobe -r");
0fdd1e2c
DG		 289 goto error;
290 }
291 modprobe[sizeof(modprobe) - 1] = '\0';
292 ret = system(modprobe);
293 if (ret == -1) {
24b487b8 294 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG		 295 kernel_modules_list[i].name);
296 } else if (kernel_modules_list[i].required
297 && WEXITSTATUS(ret) != 0) {
298 ERR("Unable to remove module %s",
299 kernel_modules_list[i].name);
300 } else {
301 DBG("Modprobe removal successful %s",
302 kernel_modules_list[i].name);
303 }
304 }
305
306error:
307 return ret;
308}
309
310/*
311 * Return group ID of the tracing group or -1 if not found.
312 */
996b65c8
MD		 313static gid_t allowed_group(void)
314{
315 struct group *grp;
316
274e143b
MD		 317 if (opt_tracing_group) {
318 grp = getgrnam(opt_tracing_group);
319 } else {
320 grp = getgrnam(default_tracing_group);
321 }
996b65c8
MD		 322 if (!grp) {
323 return -1;
324 } else {
325 return grp->gr_gid;
326 }
327}
328
273ea72c 329/*
5eb91c98 330 * Init thread quit pipe.
273ea72c
DG		 331 *
332 * Return -1 on error or 0 if all pipes are created.
333 */
334static int init_thread_quit_pipe(void)
335{
336 int ret;
337
338 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
339 if (ret < 0) {
340 perror("thread quit pipe");
341 goto error;
342 }
343
344error:
345 return ret;
346}
347
fac6795d 348/*
d063d709
DG		 349 * Complete teardown of a kernel session. This free all data structure related
350 * to a kernel session and update counter.
fac6795d 351 */
1d4b027a 352static void teardown_kernel_session(struct ltt_session *session)
fac6795d 353{
8f7a84dd
DG		 354 if (!session->kernel_session) {
355 DBG3("No kernel session when tearingdown session");
84ea9c99 356 return;
8f7a84dd
DG		 357 }
358
84ea9c99 359 DBG("Tearing down kernel session");
d9800920 360
84ea9c99
MD		 361 /*
362 * If a custom kernel consumer was registered, close the socket before
363 * tearing down the complete kernel session structure
364 */
365 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
366 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 367 }
84ea9c99
MD		 368
369 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 370}
371
f6a9efaa
DG		 372/*
373 * Complete teardown of all UST sessions. This will free everything on his path
374 * and destroy the core essence of all ust sessions :)
375 */
376static void teardown_ust_session(struct ltt_session *session)
377{
84cd17c6
MD		 378 int ret;
379
8f7a84dd
DG		 380 if (!session->ust_session) {
381 DBG3("No UST session when tearingdown session");
f470a390 382 return;
8f7a84dd
DG		 383 }
384
84ea9c99 385 DBG("Tearing down UST session(s)");
8f7a84dd 386
84cd17c6
MD		 387 ret = ust_app_destroy_trace_all(session->ust_session);
388 if (ret) {
389 ERR("Error in ust_app_destroy_trace_all");
390 }
8f7a84dd 391
f6a9efaa
DG		 392 trace_ust_destroy_session(session->ust_session);
393}
394
099e26bd
DG		 395/*
396 * Stop all threads by closing the thread quit pipe.
397 */
cf3af59e
MD		 398static void stop_threads(void)
399{
5eb91c98
DG		 400 int ret;
401
cf3af59e
MD		 402 /* Stopping all threads */
403 DBG("Terminating all threads");
54d01ffb 404 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 405 if (ret < 0) {
406 ERR("write error on thread quit pipe");
407 }
408
099e26bd
DG		 409 /* Dispatch thread */
410 dispatch_thread_exit = 1;
411 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 412}
413
fac6795d 414/*
d063d709 415 * Cleanup the daemon
fac6795d 416 */
cf3af59e 417static void cleanup(void)
fac6795d 418{
1d4b027a
DG		 419 int ret;
420 char *cmd;
af9737e9 421 struct ltt_session *sess, *stmp;
fac6795d 422
1d4b027a 423 DBG("Cleaning up");
e07ae692 424
67e40797
DG		 425 DBG("Removing %s directory", rundir);
426 ret = asprintf(&cmd, "rm -rf %s", rundir);
427 if (ret < 0) {
428 ERR("asprintf failed. Something is really wrong!");
429 }
5461b305 430
67e40797
DG		 431 /* Remove lttng run directory */
432 ret = system(cmd);
433 if (ret < 0) {
434 ERR("Unable to clean %s", rundir);
1d4b027a 435 }
67e40797 436 free(cmd);
5461b305 437
1d4b027a 438 DBG("Cleaning up all session");
fac6795d 439
b5541356 440 /* Destroy session list mutex */
273ea72c
DG		 441 if (session_list_ptr != NULL) {
442 pthread_mutex_destroy(&session_list_ptr->lock);
443
444 /* Cleanup ALL session */
54d01ffb
DG		 445 cds_list_for_each_entry_safe(sess, stmp,
446 &session_list_ptr->head, list) {
273ea72c 447 teardown_kernel_session(sess);
f6a9efaa
DG		 448 teardown_ust_session(sess);
449 free(sess);
273ea72c
DG		 450 }
451 }
452
099e26bd 453 DBG("Closing all UST sockets");
56fff090 454 ust_app_clean_list();
099e26bd 455
3bd1e081 456 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 457
4fba7219
DG		 458 if (is_root && !opt_no_kernel) {
459 DBG2("Closing kernel fd");
460 close(kernel_tracer_fd);
2f50c8a3
DG		 461 DBG("Unloading kernel modules");
462 modprobe_remove_kernel_modules();
463 }
5eb91c98
DG		 464
465 close(thread_quit_pipe[0]);
466 close(thread_quit_pipe[1]);
421cb601
DG		 467
468 /* <fun> */
f56a39af 469 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG		 470 "Matthew, BEET driven development works!%c[%dm",
471 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
472 /* </fun> */
fac6795d
DG		 473}
474
e065084a 475/*
d063d709 476 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 477 *
d063d709 478 * Return lttcomm error code.
e065084a
DG		 479 */
480static int send_unix_sock(int sock, void *buf, size_t len)
481{
482 /* Check valid length */
483 if (len <= 0) {
484 return -1;
485 }
486
487 return lttcomm_send_unix_sock(sock, buf, len);
488}
489
5461b305 490/*
d063d709 491 * Free memory of a command context structure.
5461b305 492 */
a2fb29a5 493static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 494{
a2fb29a5
DG		 495 DBG("Clean command context structure");
496 if (*cmd_ctx) {
497 if ((*cmd_ctx)->llm) {
498 free((*cmd_ctx)->llm);
5461b305 499 }
a2fb29a5
DG		 500 if ((*cmd_ctx)->lsm) {
501 free((*cmd_ctx)->lsm);
5461b305 502 }
a2fb29a5
DG		 503 free(*cmd_ctx);
504 *cmd_ctx = NULL;
5461b305
DG		 505 }
506}
507
f3ed775e 508/*
d063d709 509 * Send all stream fds of kernel channel to the consumer.
f3ed775e 510 */
2bdd86d4 511static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD		 512 int sock, struct ltt_kernel_channel *channel,
513 uid_t uid, gid_t gid)
f3ed775e
DG		 514{
515 int ret;
f3ed775e 516 struct ltt_kernel_stream *stream;
3bd1e081 517 struct lttcomm_consumer_msg lkm;
f3ed775e 518
3bd1e081 519 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 520 channel->channel->name);
f3ed775e 521
3bd1e081
MD		 522 /* Send channel */
523 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
524 lkm.u.channel.channel_key = channel->fd;
525 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
526 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 527 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 528 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 529 if (ret < 0) {
3bd1e081 530 perror("send consumer channel");
f3ed775e
DG		 531 goto error;
532 }
533
3bd1e081 534 /* Send streams */
7a485870 535 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 536 if (!stream->fd) {
537 continue;
538 }
539 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
540 lkm.u.stream.channel_key = channel->fd;
541 lkm.u.stream.stream_key = stream->fd;
542 lkm.u.stream.state = stream->state;
543 lkm.u.stream.output = channel->channel->attr.output;
544 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 545 lkm.u.stream.uid = uid;
546 lkm.u.stream.gid = gid;
3bd1e081
MD		 547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
f3ed775e
DG		 559 }
560 }
561
3bd1e081 562 DBG("consumer channel streams sent");
f3ed775e
DG		 563
564 return 0;
565
566error:
567 return ret;
568}
569
570/*
d063d709 571 * Send all stream fds of the kernel session to the consumer.
f3ed775e 572 */
2bdd86d4 573static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 574 struct ltt_kernel_session *session)
f3ed775e
DG		 575{
576 int ret;
577 struct ltt_kernel_channel *chan;
3bd1e081
MD		 578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
7a485870
DG		 580
581 DBG("Sending metadata stream fd");
582
2bdd86d4 583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 584 if (session->consumer_fd == 0) {
3bd1e081 585 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 586 }
587
7a485870 588 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 608 lkm.u.stream.uid = session->uid;
609 lkm.u.stream.gid = session->gid;
3bd1e081
MD		 610 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
611 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
612 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
613 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
614 if (ret < 0) {
615 perror("send consumer stream");
616 goto error;
617 }
618 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 619 if (ret < 0) {
3bd1e081 620 perror("send consumer stream");
7a485870
DG		 621 goto error;
622 }
623 }
f3ed775e 624
f3ed775e 625 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD		 626 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
627 session->uid, session->gid);
2bdd86d4
MD		 628 if (ret < 0) {
629 goto error;
630 }
631 }
632
633 DBG("consumer fds (metadata and channel streams) sent");
634
635 return 0;
636
637error:
638 return ret;
639}
640
fac6795d 641/*
0fdd1e2c 642 * Notify UST applications using the shm mmap futex.
fac6795d 643 */
0fdd1e2c 644static int notify_ust_apps(int active)
fac6795d 645{
0fdd1e2c 646 char *wait_shm_mmap;
fac6795d 647
0fdd1e2c 648 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 649
0fdd1e2c
DG		 650 /* See shm.c for this call implying mmap, shm and futex calls */
651 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
652 if (wait_shm_mmap == NULL) {
fac6795d
DG		 653 goto error;
654 }
655
0fdd1e2c
DG		 656 /* Wake waiting process */
657 futex_wait_update((int32_t *) wait_shm_mmap, active);
658
659 /* Apps notified successfully */
660 return 0;
fac6795d
DG		 661
662error:
0fdd1e2c 663 return -1;
fac6795d
DG		 664}
665
e065084a 666/*
d063d709
DG		 667 * Setup the outgoing data buffer for the response (llm) by allocating the
668 * right amount of memory and copying the original information from the lsm
669 * structure.
ca95a216 670 *
d063d709 671 * Return total size of the buffer pointed by buf.
ca95a216 672 */
5461b305 673static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 674{
f3ed775e 675 int ret, buf_size;
ca95a216 676
f3ed775e 677 buf_size = size;
5461b305 678
ba7f0ae5 679 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 680 if (cmd_ctx->llm == NULL) {
ba7f0ae5 681 perror("zmalloc");
5461b305 682 ret = -ENOMEM;
ca95a216
DG		 683 goto error;
684 }
685
5461b305
DG		 686 /* Copy common data */
687 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 688 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 689
5461b305
DG		 690 cmd_ctx->llm->data_size = size;
691 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
692
ca95a216
DG		 693 return buf_size;
694
695error:
696 return ret;
697}
698
7a485870 699/*
5eb91c98 700 * Update the kernel poll set of all channel fd available over all tracing
d063d709 701 * session. Add the wakeup pipe at the end of the set.
7a485870 702 */
5eb91c98 703static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 704{
5eb91c98 705 int ret;
7a485870
DG		 706 struct ltt_session *session;
707 struct ltt_kernel_channel *channel;
708
5eb91c98 709 DBG("Updating kernel poll set");
7a485870 710
54d01ffb 711 session_lock_list();
b5541356 712 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 713 session_lock(session);
7a485870 714 if (session->kernel_session == NULL) {
54d01ffb 715 session_unlock(session);
7a485870
DG		 716 continue;
717 }
7a485870 718
54d01ffb
DG		 719 cds_list_for_each_entry(channel,
720 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 721 /* Add channel fd to the kernel poll set */
722 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
723 if (ret < 0) {
54d01ffb 724 session_unlock(session);
5eb91c98
DG		 725 goto error;
726 }
727 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 728 }
54d01ffb 729 session_unlock(session);
7a485870 730 }
54d01ffb 731 session_unlock_list();
7a485870 732
5eb91c98 733 return 0;
7a485870
DG		 734
735error:
54d01ffb 736 session_unlock_list();
7a485870
DG		 737 return -1;
738}
739
740/*
54d01ffb 741 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 742 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 743 *
d063d709 744 * Useful for CPU hotplug feature.
7a485870 745 */
2bdd86d4 746static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 747{
748 int ret = 0;
749 struct ltt_session *session;
750 struct ltt_kernel_channel *channel;
751
752 DBG("Updating kernel streams for channel fd %d", fd);
753
54d01ffb 754 session_lock_list();
b5541356 755 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 756 session_lock(session);
7a485870 757 if (session->kernel_session == NULL) {
54d01ffb 758 session_unlock(session);
7a485870
DG		 759 continue;
760 }
d9800920
DG		 761
762 /* This is not suppose to be 0 but this is an extra security check */
763 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 764 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 765 }
766
5eb91c98
DG		 767 cds_list_for_each_entry(channel,
768 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 769 if (channel->fd == fd) {
770 DBG("Channel found, updating kernel streams");
771 ret = kernel_open_channel_stream(channel);
772 if (ret < 0) {
b3c750d2 773 goto error;
7a485870 774 }
d9800920 775
7a485870 776 /*
5eb91c98
DG		 777 * Have we already sent fds to the consumer? If yes, it means
778 * that tracing is started so it is safe to send our updated
779 * stream fds.
7a485870 780 */
3bd1e081 781 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 782 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD		 783 session->kernel_session->consumer_fd, channel,
784 session->uid, session->gid);
7a485870 785 if (ret < 0) {
b3c750d2 786 goto error;
7a485870
DG		 787 }
788 }
b3c750d2 789 goto error;
7a485870
DG		 790 }
791 }
54d01ffb 792 session_unlock(session);
7a485870 793 }
54d01ffb 794 session_unlock_list();
b3c750d2 795 return ret;
7a485870 796
b3c750d2 797error:
54d01ffb
DG		 798 session_unlock(session);
799 session_unlock_list();
7a485870
DG		 800 return ret;
801}
802
487cf67c
DG		 803/*
804 * For each tracing session, update newly registered apps.
805 */
806static void update_ust_app(int app_sock)
807{
808 struct ltt_session *sess, *stmp;
809
810 /* For all tracing session(s) */
811 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG		 812 if (sess->ust_session) {
813 ust_app_global_update(sess->ust_session, app_sock);
814 }
487cf67c
DG		 815 }
816}
817
7a485870 818/*
d063d709 819 * This thread manage event coming from the kernel.
7a485870 820 *
d063d709
DG		 821 * Features supported in this thread:
822 * -) CPU Hotplug
7a485870
DG		 823 */
824static void *thread_manage_kernel(void *data)
825{
5eb91c98
DG		 826 int ret, i, pollfd, update_poll_flag = 1;
827 uint32_t revents, nb_fd;
7a485870 828 char tmp;
5eb91c98 829 struct lttng_poll_event events;
7a485870
DG		 830
831 DBG("Thread manage kernel started");
832
5eb91c98
DG		 833 ret = create_thread_poll_set(&events, 2);
834 if (ret < 0) {
835 goto error;
836 }
837
838 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
839 if (ret < 0) {
840 goto error;
841 }
842
7a485870
DG		 843 while (1) {
844 if (update_poll_flag == 1) {
5f822d0a
DG		 845 /*
846 * Reset number of fd in the poll set. Always 2 since there is the thread
847 * quit pipe and the kernel pipe.
848 */
849 events.nb_fd = 2;
850
5eb91c98
DG		 851 ret = update_kernel_poll(&events);
852 if (ret < 0) {
7a485870
DG		 853 goto error;
854 }
855 update_poll_flag = 0;
856 }
857
5eb91c98
DG		 858 nb_fd = LTTNG_POLL_GETNB(&events);
859
860 DBG("Thread kernel polling on %d fds", nb_fd);
861
862 /* Zeroed the poll events */
863 lttng_poll_reset(&events);
7a485870
DG		 864
865 /* Poll infinite value of time */
5eb91c98 866 ret = lttng_poll_wait(&events, -1);
7a485870 867 if (ret < 0) {
7a485870
DG		 868 goto error;
869 } else if (ret == 0) {
870 /* Should not happen since timeout is infinite */
85611738
DG		 871 ERR("Return value of poll is 0 with an infinite timeout.\n"
872 "This should not have happened! Continuing...");
7a485870
DG		 873 continue;
874 }
875
5eb91c98
DG		 876 for (i = 0; i < nb_fd; i++) {
877 /* Fetch once the poll data */
878 revents = LTTNG_POLL_GETEV(&events, i);
879 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 880
5eb91c98
DG		 881 /* Thread quit pipe has been closed. Killing thread. */
882 ret = check_thread_quit_pipe(pollfd, revents);
883 if (ret) {
884 goto error;
885 }
7a485870 886
5eb91c98
DG		 887 /* Check for data on kernel pipe */
888 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
889 ret = read(kernel_poll_pipe[0], &tmp, 1);
890 update_poll_flag = 1;
891 continue;
892 } else {
893 /*
894 * New CPU detected by the kernel. Adding kernel stream to
895 * kernel session and updating the kernel consumer
896 */
897 if (revents & LPOLLIN) {
2bdd86d4 898 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 899 if (ret < 0) {
900 continue;
901 }
902 break;
903 /*
904 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
905 * and unregister kernel stream at this point.
906 */
7a485870 907 }
7a485870
DG		 908 }
909 }
910 }
911
912error:
913 DBG("Kernel thread dying");
273ea72c
DG		 914 close(kernel_poll_pipe[0]);
915 close(kernel_poll_pipe[1]);
5eb91c98
DG		 916
917 lttng_poll_clean(&events);
918
7a485870
DG		 919 return NULL;
920}
921
1d4b027a 922/*
3bd1e081 923 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 924 */
3bd1e081 925static void *thread_manage_consumer(void *data)
1d4b027a 926{
5eb91c98
DG		 927 int sock = 0, i, ret, pollfd;
928 uint32_t revents, nb_fd;
1d4b027a 929 enum lttcomm_return_code code;
5eb91c98 930 struct lttng_poll_event events;
3bd1e081 931 struct consumer_data *consumer_data = data;
1d4b027a 932
3bd1e081 933 DBG("[thread] Manage consumer started");
1d4b027a 934
3bd1e081 935 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 936 if (ret < 0) {
937 goto error;
938 }
939
5eb91c98
DG		 940 /*
941 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
942 * Nothing more will be added to this poll set.
943 */
944 ret = create_thread_poll_set(&events, 2);
945 if (ret < 0) {
946 goto error;
947 }
273ea72c 948
3bd1e081 949 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 950 if (ret < 0) {
951 goto error;
952 }
953
954 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 955
956 /* Inifinite blocking call, waiting for transmission */
5eb91c98 957 ret = lttng_poll_wait(&events, -1);
273ea72c 958 if (ret < 0) {
273ea72c
DG		 959 goto error;
960 }
961
5eb91c98
DG		 962 for (i = 0; i < nb_fd; i++) {
963 /* Fetch once the poll data */
964 revents = LTTNG_POLL_GETEV(&events, i);
965 pollfd = LTTNG_POLL_GETFD(&events, i);
966
967 /* Thread quit pipe has been closed. Killing thread. */
968 ret = check_thread_quit_pipe(pollfd, revents);
969 if (ret) {
970 goto error;
971 }
972
973 /* Event on the registration socket */
3bd1e081 974 if (pollfd == consumer_data->err_sock) {
5eb91c98 975 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 976 ERR("consumer err socket poll error");
5eb91c98
DG		 977 goto error;
978 }
979 }
273ea72c
DG		 980 }
981
3bd1e081 982 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 983 if (sock < 0) {
984 goto error;
985 }
986
3bd1e081 987 DBG2("Receiving code from consumer err_sock");
ee0b0061 988
712ea556 989 /* Getting status code from kconsumerd */
54d01ffb
DG		 990 ret = lttcomm_recv_unix_sock(sock, &code,
991 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 992 if (ret <= 0) {
993 goto error;
994 }
995
3bd1e081
MD		 996 if (code == CONSUMERD_COMMAND_SOCK_READY) {
997 consumer_data->cmd_sock =
998 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
999 if (consumer_data->cmd_sock < 0) {
1000 sem_post(&consumer_data->sem);
48842b30 1001 PERROR("consumer connect");
1d4b027a
DG		 1002 goto error;
1003 }
1004 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 1005 sem_post(&consumer_data->sem);
1006 DBG("consumer command socket ready");
1d4b027a 1007 } else {
3bd1e081 1008 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 1009 lttcomm_get_readable_code(-code));
1010 goto error;
1011 }
1012
54d01ffb 1013 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1014 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1015 if (ret < 0) {
72079cae
DG		 1016 goto error;
1017 }
1018
5eb91c98
DG		 1019 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1020 if (ret < 0) {
72079cae 1021 goto error;
5eb91c98
DG		 1022 }
1023
1024 /* Update number of fd */
1025 nb_fd = LTTNG_POLL_GETNB(&events);
1026
1027 /* Inifinite blocking call, waiting for transmission */
1028 ret = lttng_poll_wait(&events, -1);
1029 if (ret < 0) {
72079cae
DG		 1030 goto error;
1031 }
1032
5eb91c98
DG		 1033 for (i = 0; i < nb_fd; i++) {
1034 /* Fetch once the poll data */
1035 revents = LTTNG_POLL_GETEV(&events, i);
1036 pollfd = LTTNG_POLL_GETFD(&events, i);
1037
1038 /* Thread quit pipe has been closed. Killing thread. */
1039 ret = check_thread_quit_pipe(pollfd, revents);
1040 if (ret) {
1041 goto error;
1042 }
1043
1044 /* Event on the kconsumerd socket */
1045 if (pollfd == sock) {
1046 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1047 ERR("consumer err socket second poll error");
5eb91c98
DG		 1048 goto error;
1049 }
1050 }
1051 }
1052
712ea556 1053 /* Wait for any kconsumerd error */
54d01ffb
DG		 1054 ret = lttcomm_recv_unix_sock(sock, &code,
1055 sizeof(enum lttcomm_return_code));
712ea556 1056 if (ret <= 0) {
3bd1e081 1057 ERR("consumer closed the command socket");
712ea556 1058 goto error;
6f61d021 1059 }
1d4b027a 1060
3bd1e081 1061 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1062
1d4b027a 1063error:
3bd1e081
MD		 1064 DBG("consumer thread dying");
1065 close(consumer_data->err_sock);
1066 close(consumer_data->cmd_sock);
5eb91c98 1067 close(sock);
273ea72c 1068
3bd1e081
MD		 1069 unlink(consumer_data->err_unix_sock_path);
1070 unlink(consumer_data->cmd_unix_sock_path);
1071 consumer_data->pid = 0;
1d4b027a 1072
5eb91c98 1073 lttng_poll_clean(&events);
0177d773 1074
5eb91c98 1075 return NULL;
099e26bd
DG		 1076}
1077
099e26bd
DG		 1078/*
1079 * This thread manage application communication.
1d4b027a
DG		 1080 */
1081static void *thread_manage_apps(void *data)
099e26bd 1082{
5eb91c98
DG		 1083 int i, ret, pollfd;
1084 uint32_t revents, nb_fd;
099e26bd 1085 struct ust_command ust_cmd;
5eb91c98 1086 struct lttng_poll_event events;
099e26bd
DG		 1087
1088 DBG("[thread] Manage application started");
1089
f6a9efaa
DG		 1090 rcu_register_thread();
1091 rcu_thread_online();
1092
5eb91c98
DG		 1093 ret = create_thread_poll_set(&events, 2);
1094 if (ret < 0) {
1095 goto error;
1096 }
099e26bd 1097
5eb91c98
DG		 1098 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1099 if (ret < 0) {
1100 goto error;
1101 }
099e26bd 1102
5eb91c98
DG		 1103 while (1) {
1104 /* Zeroed the events structure */
1105 lttng_poll_reset(&events);
0177d773 1106
5eb91c98 1107 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1108
1109 DBG("Apps thread polling on %d fds", nb_fd);
1110
1111 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1112 ret = lttng_poll_wait(&events, -1);
099e26bd 1113 if (ret < 0) {
099e26bd
DG		 1114 goto error;
1115 }
1116
5eb91c98
DG		 1117 for (i = 0; i < nb_fd; i++) {
1118 /* Fetch once the poll data */
1119 revents = LTTNG_POLL_GETEV(&events, i);
1120 pollfd = LTTNG_POLL_GETFD(&events, i);
1121
1122 /* Thread quit pipe has been closed. Killing thread. */
1123 ret = check_thread_quit_pipe(pollfd, revents);
1124 if (ret) {
099e26bd 1125 goto error;
5eb91c98 1126 }
099e26bd 1127
5eb91c98
DG		 1128 /* Inspect the apps cmd pipe */
1129 if (pollfd == apps_cmd_pipe[0]) {
1130 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1131 ERR("Apps command pipe error");
0177d773 1132 goto error;
5eb91c98
DG		 1133 } else if (revents & LPOLLIN) {
1134 /* Empty pipe */
1135 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1136 if (ret < 0 || ret < sizeof(ust_cmd)) {
1137 perror("read apps cmd pipe");
1138 goto error;
1139 }
099e26bd 1140
5eb91c98 1141 /* Register applicaton to the session daemon */
56fff090 1142 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1143 ust_cmd.sock);
88ff5b7f 1144 if (ret == -ENOMEM) {
5eb91c98 1145 goto error;
88ff5b7f
MD		 1146 } else if (ret < 0) {
1147 break;
5eb91c98
DG		 1148 }
1149
acc7b41b
MD		 1150 /*
1151 * Add channel(s) and event(s) to newly registered apps
1152 * from lttng global UST domain.
1153 */
1154 update_ust_app(ust_cmd.sock);
1155
f2ca2e25 1156 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG		 1157 if (ret < 0) {
1158 /*
1159 * If the registration is not possible, we simply
1160 * unregister the apps and continue
1161 */
56fff090 1162 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1163 } else {
1164 /*
1165 * We just need here to monitor the close of the UST
1166 * socket and poll set monitor those by default.
1167 */
1168 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1169 if (ret < 0) {
1170 goto error;
1171 }
1172
54d01ffb
DG		 1173 DBG("Apps with sock %d added to poll set",
1174 ust_cmd.sock);
5eb91c98 1175 }
487cf67c 1176
5eb91c98 1177 break;
0177d773 1178 }
5eb91c98
DG		 1179 } else {
1180 /*
54d01ffb
DG		 1181 * At this point, we know that a registered application made
1182 * the event at poll_wait.
5eb91c98
DG		 1183 */
1184 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1185 /* Removing from the poll set */
1186 ret = lttng_poll_del(&events, pollfd);
1187 if (ret < 0) {
1188 goto error;
1189 }
099e26bd 1190
b9d9b220 1191 /* Socket closed on remote end. */
56fff090 1192 ust_app_unregister(pollfd);
5eb91c98
DG		 1193 break;
1194 }
099e26bd
DG		 1195 }
1196 }
099e26bd
DG		 1197 }
1198
1199error:
1200 DBG("Application communication apps dying");
1201 close(apps_cmd_pipe[0]);
1202 close(apps_cmd_pipe[1]);
1203
5eb91c98 1204 lttng_poll_clean(&events);
099e26bd 1205
f6a9efaa
DG		 1206 rcu_thread_offline();
1207 rcu_unregister_thread();
099e26bd
DG		 1208 return NULL;
1209}
1210
1211/*
1212 * Dispatch request from the registration threads to the application
1213 * communication thread.
1214 */
1215static void *thread_dispatch_ust_registration(void *data)
1216{
1217 int ret;
1218 struct cds_wfq_node *node;
1219 struct ust_command *ust_cmd = NULL;
1220
1221 DBG("[thread] Dispatch UST command started");
1222
1223 while (!dispatch_thread_exit) {
1224 /* Atomically prepare the queue futex */
1225 futex_nto1_prepare(&ust_cmd_queue.futex);
1226
1227 do {
1228 /* Dequeue command for registration */
1229 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1230 if (node == NULL) {
00a17c97 1231 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1232 /* Continue thread execution */
1233 break;
1234 }
1235
1236 ust_cmd = caa_container_of(node, struct ust_command, node);
1237
2f50c8a3
DG		 1238 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1239 " gid:%d sock:%d name:%s (version %d.%d)",
1240 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1241 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1242 ust_cmd->sock, ust_cmd->reg_msg.name,
1243 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1244 /*
1245 * Inform apps thread of the new application registration. This
1246 * call is blocking so we can be assured that the data will be read
1247 * at some point in time or wait to the end of the world :)
1248 */
1249 ret = write(apps_cmd_pipe[1], ust_cmd,
1250 sizeof(struct ust_command));
1251 if (ret < 0) {
1252 perror("write apps cmd pipe");
1253 if (errno == EBADF) {
1254 /*
1255 * We can't inform the application thread to process
1256 * registration. We will exit or else application
1257 * registration will not occur and tracing will never
1258 * start.
1259 */
1260 goto error;
1261 }
1262 }
1263 free(ust_cmd);
1264 } while (node != NULL);
1265
1266 /* Futex wait on queue. Blocking call on futex() */
1267 futex_nto1_wait(&ust_cmd_queue.futex);
1268 }
1269
1270error:
1271 DBG("Dispatch thread dying");
1272 return NULL;
1273}
1274
1275/*
1276 * This thread manage application registration.
1277 */
1278static void *thread_registration_apps(void *data)
1d4b027a 1279{
5eb91c98
DG		 1280 int sock = 0, i, ret, pollfd;
1281 uint32_t revents, nb_fd;
1282 struct lttng_poll_event events;
099e26bd
DG		 1283 /*
1284 * Get allocated in this thread, enqueued to a global queue, dequeued and
1285 * freed in the manage apps thread.
1286 */
1287 struct ust_command *ust_cmd = NULL;
1d4b027a 1288
099e26bd 1289 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1290
1291 ret = lttcomm_listen_unix_sock(apps_sock);
1292 if (ret < 0) {
1293 goto error;
1294 }
1295
5eb91c98
DG		 1296 /*
1297 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1298 * more will be added to this poll set.
1299 */
1300 ret = create_thread_poll_set(&events, 2);
1301 if (ret < 0) {
1302 goto error;
1303 }
273ea72c 1304
5eb91c98
DG		 1305 /* Add the application registration socket */
1306 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1307 if (ret < 0) {
1308 goto error;
1309 }
273ea72c 1310
1d4b027a 1311 /* Notify all applications to register */
0fdd1e2c
DG		 1312 ret = notify_ust_apps(1);
1313 if (ret < 0) {
1314 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1315 "Execution continues but there might be problem for already\n"
1316 "running applications that wishes to register.");
0fdd1e2c 1317 }
1d4b027a
DG		 1318
1319 while (1) {
1320 DBG("Accepting application registration");
273ea72c 1321
5eb91c98
DG		 1322 nb_fd = LTTNG_POLL_GETNB(&events);
1323
273ea72c 1324 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1325 ret = lttng_poll_wait(&events, -1);
273ea72c 1326 if (ret < 0) {
273ea72c
DG		 1327 goto error;
1328 }
1329
5eb91c98
DG		 1330 for (i = 0; i < nb_fd; i++) {
1331 /* Fetch once the poll data */
1332 revents = LTTNG_POLL_GETEV(&events, i);
1333 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1334
5eb91c98
DG		 1335 /* Thread quit pipe has been closed. Killing thread. */
1336 ret = check_thread_quit_pipe(pollfd, revents);
1337 if (ret) {
90014c57
DG		 1338 goto error;
1339 }
1d4b027a 1340
5eb91c98
DG		 1341 /* Event on the registration socket */
1342 if (pollfd == apps_sock) {
1343 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1344 ERR("Register apps socket poll error");
1345 goto error;
1346 } else if (revents & LPOLLIN) {
1347 sock = lttcomm_accept_unix_sock(apps_sock);
1348 if (sock < 0) {
1349 goto error;
1350 }
099e26bd 1351
5eb91c98 1352 /* Create UST registration command for enqueuing */
ba7f0ae5 1353 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1354 if (ust_cmd == NULL) {
ba7f0ae5 1355 perror("ust command zmalloc");
5eb91c98
DG		 1356 goto error;
1357 }
1d4b027a 1358
5eb91c98
DG		 1359 /*
1360 * Using message-based transmissions to ensure we don't
1361 * have to deal with partially received messages.
1362 */
1363 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1364 sizeof(struct ust_register_msg));
1365 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1366 if (ret < 0) {
1367 perror("lttcomm_recv_unix_sock register apps");
1368 } else {
1369 ERR("Wrong size received on apps register");
1370 }
1371 free(ust_cmd);
1372 close(sock);
1373 continue;
1374 }
099e26bd 1375
5eb91c98 1376 ust_cmd->sock = sock;
099e26bd 1377
5eb91c98
DG		 1378 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1379 " gid:%d sock:%d name:%s (version %d.%d)",
1380 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1381 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1382 ust_cmd->sock, ust_cmd->reg_msg.name,
1383 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1384
5eb91c98
DG		 1385 /*
1386 * Lock free enqueue the registration request. The red pill
54d01ffb 1387 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1388 */
1389 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1390
1391 /*
1392 * Wake the registration queue futex. Implicit memory
1393 * barrier with the exchange in cds_wfq_enqueue.
1394 */
1395 futex_nto1_wake(&ust_cmd_queue.futex);
1396 }
1397 }
90014c57 1398 }
1d4b027a
DG		 1399 }
1400
1401error:
0fdd1e2c
DG		 1402 DBG("UST Registration thread dying");
1403
1404 /* Notify that the registration thread is gone */
1405 notify_ust_apps(0);
1406
1407 close(apps_sock);
1408 close(sock);
273ea72c 1409 unlink(apps_unix_sock_path);
0fdd1e2c 1410
5eb91c98
DG		 1411 lttng_poll_clean(&events);
1412
1d4b027a
DG		 1413 return NULL;
1414}
1415
8c0faa1d 1416/*
3bd1e081 1417 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1418 * exec or it will fails.
8c0faa1d 1419 */
3bd1e081 1420static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1421{
1422 int ret;
ee0b0061
DG		 1423 struct timespec timeout;
1424
1425 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1426 timeout.tv_nsec = 0;
8c0faa1d
DG		 1427
1428 /* Setup semaphore */
3bd1e081 1429 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1430 if (ret < 0) {
3bd1e081 1431 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1432 goto error;
1433 }
8c0faa1d 1434
3bd1e081
MD		 1435 ret = pthread_create(&consumer_data->thread, NULL,
1436 thread_manage_consumer, consumer_data);
8c0faa1d 1437 if (ret != 0) {
3bd1e081 1438 PERROR("pthread_create consumer");
ee0b0061 1439 ret = -1;
8c0faa1d
DG		 1440 goto error;
1441 }
1442
ee0b0061
DG		 1443 /* Get time for sem_timedwait absolute timeout */
1444 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1445 if (ret < 0) {
3bd1e081 1446 PERROR("clock_gettime spawn consumer");
ee0b0061 1447 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1448 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1449 } else {
1450 /* Normal timeout if the gettime was successful */
1451 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1452 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1453 }
8c0faa1d 1454
ee0b0061
DG		 1455 if (ret < 0) {
1456 if (errno == ETIMEDOUT) {
1457 /*
1458 * Call has timed out so we kill the kconsumerd_thread and return
1459 * an error.
1460 */
3bd1e081
MD		 1461 ERR("The consumer thread was never ready. Killing it");
1462 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1463 if (ret < 0) {
3bd1e081 1464 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1465 }
1466 } else {
3bd1e081 1467 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1468 }
1469 goto error;
1470 }
1471
3bd1e081
MD		 1472 pthread_mutex_lock(&consumer_data->pid_mutex);
1473 if (consumer_data->pid == 0) {
712ea556 1474 ERR("Kconsumerd did not start");
3bd1e081 1475 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1476 goto error;
1477 }
3bd1e081 1478 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1479
8c0faa1d
DG		 1480 return 0;
1481
1482error:
1483 return ret;
1484}
1485
d9800920 1486/*
3bd1e081 1487 * Join consumer thread
d9800920 1488 */
3bd1e081 1489static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1490{
1491 void *status;
1492 int ret;
1493
3bd1e081
MD		 1494 if (consumer_data->pid != 0) {
1495 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1496 if (ret) {
3bd1e081 1497 ERR("Error killing consumer daemon");
cf3af59e
MD		 1498 return ret;
1499 }
3bd1e081 1500 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1501 } else {
1502 return 0;
1503 }
1504}
1505
8c0faa1d 1506/*
3bd1e081 1507 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1508 *
d063d709 1509 * Return pid if successful else -1.
8c0faa1d 1510 */
3bd1e081 1511static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1512{
1513 int ret;
1514 pid_t pid;
94c55f17 1515 const char *consumer_to_use;
53086306 1516 const char *verbosity;
94c55f17 1517 struct stat st;
8c0faa1d 1518
3bd1e081 1519 DBG("Spawning consumerd");
c49dc785 1520
8c0faa1d
DG		 1521 pid = fork();
1522 if (pid == 0) {
1523 /*
3bd1e081 1524 * Exec consumerd.
8c0faa1d 1525 */
daee5345 1526 if (opt_verbose_consumer) {
53086306
DG		 1527 verbosity = "--verbose";
1528 } else {
1529 verbosity = "--quiet";
1530 }
3bd1e081
MD		 1531 switch (consumer_data->type) {
1532 case LTTNG_CONSUMER_KERNEL:
94c55f17 1533 /*
f806231f
MD		 1534 * Find out which consumerd to execute. We will
1535 * first try the 64-bit path, then the
1536 * sessiond's installation directory, and
1537 * fallback on the 32-bit one,
94c55f17 1538 */
63a799e8
AM		 1539 DBG3("Looking for a kernel consumer at these locations:");
1540 DBG3(" 1) %s", consumerd64_bin);
1541 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1542 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1543 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1544 DBG3("Found location #1");
94c55f17 1545 consumer_to_use = consumerd64_bin;
94c55f17 1546 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1547 DBG3("Found location #2");
94c55f17 1548 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1549 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1550 DBG3("Found location #3");
eb1e0bd4 1551 consumer_to_use = consumerd32_bin;
94c55f17 1552 } else {
63a799e8 1553 DBG("Could not find any valid consumerd executable");
94c55f17
AM		 1554 break;
1555 }
1556 DBG("Using kernel consumer at: %s", consumer_to_use);
1557 execl(consumer_to_use,
1558 "lttng-consumerd", verbosity, "-k",
1559 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1560 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1561 NULL);
3bd1e081 1562 break;
7753dea8
MD		 1563 case LTTNG_CONSUMER64_UST:
1564 {
b1e0b6b6 1565 char *tmpnew = NULL;
8f4905da
MD		 1566
1567 if (consumerd64_libdir[0] != '\0') {
1568 char *tmp;
1569 size_t tmplen;
1570
1571 tmp = getenv("LD_LIBRARY_PATH");
1572 if (!tmp) {
1573 tmp = "";
1574 }
1575 tmplen = strlen("LD_LIBRARY_PATH=")
1576 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1577 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1578 if (!tmpnew) {
1579 ret = -ENOMEM;
1580 goto error;
1581 }
1582 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1583 strcat(tmpnew, consumerd64_libdir);
1584 if (tmp[0] != '\0') {
1585 strcat(tmpnew, ":");
1586 strcat(tmpnew, tmp);
1587 }
1588 ret = putenv(tmpnew);
1589 if (ret) {
1590 ret = -errno;
1591 goto error;
1592 }
1593 }
94c55f17 1594 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1595 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1596 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1597 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1598 NULL);
8f4905da
MD		 1599 if (consumerd64_libdir[0] != '\0') {
1600 free(tmpnew);
1601 }
1602 if (ret) {
1603 goto error;
1604 }
3bd1e081 1605 break;
7753dea8
MD		 1606 }
1607 case LTTNG_CONSUMER32_UST:
1608 {
937dde8e 1609 char *tmpnew = NULL;
8f4905da
MD		 1610
1611 if (consumerd32_libdir[0] != '\0') {
1612 char *tmp;
1613 size_t tmplen;
1614
1615 tmp = getenv("LD_LIBRARY_PATH");
1616 if (!tmp) {
1617 tmp = "";
1618 }
1619 tmplen = strlen("LD_LIBRARY_PATH=")
1620 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1621 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1622 if (!tmpnew) {
1623 ret = -ENOMEM;
1624 goto error;
1625 }
1626 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1627 strcat(tmpnew, consumerd32_libdir);
1628 if (tmp[0] != '\0') {
1629 strcat(tmpnew, ":");
1630 strcat(tmpnew, tmp);
1631 }
1632 ret = putenv(tmpnew);
1633 if (ret) {
1634 ret = -errno;
1635 goto error;
1636 }
1637 }
94c55f17 1638 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1639 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1640 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1641 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1642 NULL);
8f4905da
MD		 1643 if (consumerd32_libdir[0] != '\0') {
1644 free(tmpnew);
1645 }
1646 if (ret) {
1647 goto error;
1648 }
7753dea8
MD		 1649 break;
1650 }
3bd1e081
MD		 1651 default:
1652 perror("unknown consumer type");
1653 exit(EXIT_FAILURE);
1654 }
8c0faa1d
DG		 1655 if (errno != 0) {
1656 perror("kernel start consumer exec");
1657 }
1658 exit(EXIT_FAILURE);
1659 } else if (pid > 0) {
1660 ret = pid;
8c0faa1d 1661 } else {
3bd1e081 1662 perror("start consumer fork");
8c0faa1d 1663 ret = -errno;
8c0faa1d 1664 }
8f4905da 1665error:
8c0faa1d
DG		 1666 return ret;
1667}
1668
693bd40b 1669/*
3bd1e081 1670 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1671 */
3bd1e081 1672static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1673{
1674 int ret;
1675
3bd1e081
MD		 1676 pthread_mutex_lock(&consumer_data->pid_mutex);
1677 if (consumer_data->pid != 0) {
1678 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1679 goto end;
1680 }
693bd40b 1681
3bd1e081 1682 ret = spawn_consumerd(consumer_data);
c49dc785 1683 if (ret < 0) {
3bd1e081
MD		 1684 ERR("Spawning consumerd failed");
1685 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1686 goto error;
693bd40b 1687 }
c49dc785 1688
3bd1e081
MD		 1689 /* Setting up the consumer_data pid */
1690 consumer_data->pid = ret;
48842b30 1691 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1692 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1693
3bd1e081
MD		 1694 DBG2("Spawning consumer control thread");
1695 ret = spawn_consumer_thread(consumer_data);
693bd40b 1696 if (ret < 0) {
3bd1e081 1697 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1698 goto error;
1699 }
1700
c49dc785 1701end:
693bd40b
DG		 1702 return 0;
1703
1704error:
1705 return ret;
1706}
1707
b73401da 1708/*
d063d709 1709 * modprobe_kernel_modules
b73401da
DG		 1710 */
1711static int modprobe_kernel_modules(void)
1712{
ab147185 1713 int ret = 0, i;
b73401da
DG		 1714 char modprobe[256];
1715
ab147185
MD		 1716 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1717 ret = snprintf(modprobe, sizeof(modprobe),
1718 "/sbin/modprobe %s%s",
24b487b8 1719 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1720 kernel_modules_list[i].name);
b73401da
DG		 1721 if (ret < 0) {
1722 perror("snprintf modprobe");
1723 goto error;
1724 }
ab147185 1725 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1726 ret = system(modprobe);
ab147185
MD		 1727 if (ret == -1) {
1728 ERR("Unable to launch modprobe for module %s",
1729 kernel_modules_list[i].name);
1730 } else if (kernel_modules_list[i].required
d9800920 1731 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1732 ERR("Unable to load module %s",
1733 kernel_modules_list[i].name);
1734 } else {
1735 DBG("Modprobe successfully %s",
1736 kernel_modules_list[i].name);
1737 }
1738 }
1739
1740error:
1741 return ret;
1742}
1743
b73401da 1744/*
d063d709 1745 * mount_debugfs
b73401da
DG		 1746 */
1747static int mount_debugfs(char *path)
1748{
1749 int ret;
1750 char *type = "debugfs";
1751
e11d277b 1752 ret = run_as_mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1753 if (ret < 0) {
7272acf5 1754 PERROR("Cannot create debugfs path");
b73401da
DG		 1755 goto error;
1756 }
1757
1758 ret = mount(type, path, type, 0, NULL);
1759 if (ret < 0) {
7272acf5 1760 PERROR("Cannot mount debugfs");
b73401da
DG		 1761 goto error;
1762 }
1763
1764 DBG("Mounted debugfs successfully at %s", path);
1765
1766error:
1767 return ret;
1768}
1769
8c0faa1d 1770/*
d063d709 1771 * Setup necessary data for kernel tracer action.
8c0faa1d 1772 */
f3ed775e 1773static void init_kernel_tracer(void)
8c0faa1d 1774{
b73401da
DG		 1775 int ret;
1776 char *proc_mounts = "/proc/mounts";
1777 char line[256];
684d34d2 1778 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1779 FILE *fp;
1780
1781 /* Detect debugfs */
1782 fp = fopen(proc_mounts, "r");
1783 if (fp == NULL) {
1784 ERR("Unable to probe %s", proc_mounts);
1785 goto error;
1786 }
1787
1788 while (fgets(line, sizeof(line), fp) != NULL) {
1789 if (strstr(line, "debugfs") != NULL) {
1790 /* Remove first string */
1791 strtok(line, " ");
1792 /* Dup string here so we can reuse line later on */
1793 debugfs_path = strdup(strtok(NULL, " "));
1794 DBG("Got debugfs path : %s", debugfs_path);
1795 break;
1796 }
1797 }
1798
1799 fclose(fp);
1800
1801 /* Mount debugfs if needded */
1802 if (debugfs_path == NULL) {
1803 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1804 if (ret < 0) {
1805 perror("asprintf debugfs path");
1806 goto error;
1807 }
1808 ret = mount_debugfs(debugfs_path);
1809 if (ret < 0) {
7272acf5 1810 perror("Cannot mount debugfs");
b73401da
DG		 1811 goto error;
1812 }
1813 }
1814
1815 /* Modprobe lttng kernel modules */
1816 ret = modprobe_kernel_modules();
1817 if (ret < 0) {
1818 goto error;
1819 }
1820
1821 /* Setup lttng kernel path */
1822 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1823 if (ret < 0) {
1824 perror("asprintf lttng path");
1825 goto error;
1826 }
1827
1828 /* Open debugfs lttng */
1829 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1830 if (kernel_tracer_fd < 0) {
b73401da
DG		 1831 DBG("Failed to open %s", lttng_path);
1832 goto error;
8c0faa1d
DG		 1833 }
1834
b73401da
DG		 1835 free(lttng_path);
1836 free(debugfs_path);
f3ed775e 1837 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1838 return;
1839
1840error:
1841 if (lttng_path) {
1842 free(lttng_path);
1843 }
1844 if (debugfs_path) {
1845 free(debugfs_path);
1846 }
1847 WARN("No kernel tracer available");
1848 kernel_tracer_fd = 0;
1849 return;
f3ed775e 1850}
33a2b854 1851
f3ed775e 1852/*
54d01ffb 1853 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1854 */
54d01ffb 1855static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1856{
f40799e8 1857 int ret = 0;
8c0faa1d 1858
3bd1e081 1859 if (session->consumer_fds_sent == 0) {
d9800920 1860 /*
54d01ffb
DG		 1861 * Assign default kernel consumer socket if no consumer assigned to the
1862 * kernel session. At this point, it's NOT suppose to be 0 but this is
1863 * an extra security check.
d9800920
DG		 1864 */
1865 if (session->consumer_fd == 0) {
3bd1e081 1866 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1867 }
1868
2bdd86d4 1869 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1870 if (ret < 0) {
f3ed775e
DG		 1871 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1872 goto error;
1873 }
1d4b027a 1874
3bd1e081 1875 session->consumer_fds_sent = 1;
f3ed775e 1876 }
1d4b027a
DG		 1877
1878error:
1879 return ret;
8c0faa1d
DG		 1880}
1881
0177d773
DG		 1882/*
1883 * Create an UST session and add it to the session ust list.
1884 */
44d3bd01 1885static int create_ust_session(struct ltt_session *session,
6df2e2c9 1886 struct lttng_domain *domain)
0177d773 1887{
13384287 1888 struct ltt_ust_session *lus = NULL;
6df2e2c9 1889 int ret;
44d3bd01
DG		 1890
1891 switch (domain->type) {
48842b30 1892 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1893 break;
1894 default:
13384287 1895 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1896 goto error;
1897 }
0177d773
DG		 1898
1899 DBG("Creating UST session");
1900
a991f516 1901 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1902 if (lus == NULL) {
44d3bd01 1903 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1904 goto error;
1905 }
1906
e11d277b 1907 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1908 session->uid, session->gid);
0177d773
DG		 1909 if (ret < 0) {
1910 if (ret != -EEXIST) {
1911 ERR("Trace directory creation error");
44d3bd01 1912 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1913 goto error;
1914 }
1915 }
1916
f6a9efaa
DG		 1917 /* The domain type dictate different actions on session creation */
1918 switch (domain->type) {
48842b30
DG		 1919 case LTTNG_DOMAIN_UST:
1920 /* No ustctl for the global UST domain */
1921 break;
1922 default:
36dc12cc 1923 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1924 goto error;
0177d773 1925 }
6df2e2c9
MD		 1926 lus->uid = session->uid;
1927 lus->gid = session->gid;
f6a9efaa 1928 session->ust_session = lus;
44d3bd01
DG		 1929
1930 return LTTCOMM_OK;
0177d773
DG		 1931
1932error:
1933 free(lus);
1934 return ret;
1935}
1936
333f285e 1937/*
d063d709 1938 * Create a kernel tracer session then create the default channel.
333f285e 1939 */
6df2e2c9 1940static int create_kernel_session(struct ltt_session *session)
333f285e 1941{
f3ed775e 1942 int ret;
f3ed775e
DG		 1943
1944 DBG("Creating kernel session");
1945
1946 ret = kernel_create_session(session, kernel_tracer_fd);
1947 if (ret < 0) {
1948 ret = LTTCOMM_KERN_SESS_FAIL;
1949 goto error;
333f285e
DG		 1950 }
1951
d9800920 1952 /* Set kernel consumer socket fd */
3bd1e081
MD		 1953 if (kconsumer_data.cmd_sock) {
1954 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1955 }
1956
e11d277b 1957 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1958 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1959 if (ret < 0) {
996b65c8 1960 if (ret != -EEXIST) {
7a485870
DG		 1961 ERR("Trace directory creation error");
1962 goto error;
1963 }
1964 }
6df2e2c9
MD		 1965 session->kernel_session->uid = session->uid;
1966 session->kernel_session->gid = session->gid;
7a485870 1967
f3ed775e
DG		 1968error:
1969 return ret;
333f285e
DG		 1970}
1971
8e0af1b4
MD		 1972/*
1973 * Check if the UID or GID match the session. Root user has access to
1974 * all sessions.
1975 */
1976static int session_access_ok(struct ltt_session *session,
1977 uid_t uid, gid_t gid)
1978{
1979 if (uid != session->uid && gid != session->gid
1980 && uid != 0) {
1981 return 0;
1982 } else {
1983 return 1;
1984 }
1985}
1986
1987static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1988{
1989 unsigned int i = 0;
1990 struct ltt_session *session;
1991
1992 DBG("Counting number of available session for UID %d GID %d",
1993 uid, gid);
1994 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1995 /*
1996 * Only list the sessions the user can control.
1997 */
1998 if (!session_access_ok(session, uid, gid)) {
1999 continue;
2000 }
2001 i++;
2002 }
2003 return i;
2004}
2005
6c9cc2ab
DG		 2006/*
2007 * Using the session list, filled a lttng_session array to send back to the
2008 * client for session listing.
2009 *
2010 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 2011 * session_lock_list() and session_unlock_list().
6c9cc2ab 2012 */
8e0af1b4
MD		 2013static void list_lttng_sessions(struct lttng_session *sessions,
2014 uid_t uid, gid_t gid)
6c9cc2ab 2015{
8e0af1b4 2016 unsigned int i = 0;
6c9cc2ab
DG		 2017 struct ltt_session *session;
2018
8e0af1b4
MD		 2019 DBG("Getting all available session for UID %d GID %d",
2020 uid, gid);
6c9cc2ab
DG		 2021 /*
2022 * Iterate over session list and append data after the control struct in
2023 * the buffer.
2024 */
2025 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD		 2026 /*
2027 * Only list the sessions the user can control.
2028 */
2029 if (!session_access_ok(session, uid, gid)) {
2030 continue;
2031 }
6c9cc2ab 2032 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 2033 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 2034 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 2035 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 2036 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 2037 i++;
2038 }
2039}
2040
9f19cc17
DG		 2041/*
2042 * Fill lttng_channel array of all channels.
2043 */
b551a063 2044static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 2045 struct lttng_channel *channels)
2046{
2047 int i = 0;
2048 struct ltt_kernel_channel *kchan;
2049
2050 DBG("Listing channels for session %s", session->name);
2051
b551a063
DG		 2052 switch (domain) {
2053 case LTTNG_DOMAIN_KERNEL:
2054 /* Kernel channels */
2055 if (session->kernel_session != NULL) {
2056 cds_list_for_each_entry(kchan,
2057 &session->kernel_session->channel_list.head, list) {
2058 /* Copy lttng_channel struct to array */
2059 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2060 channels[i].enabled = kchan->enabled;
2061 i++;
2062 }
2063 }
2064 break;
2065 case LTTNG_DOMAIN_UST:
2066 {
bec39940 2067 struct lttng_ht_iter iter;
b551a063
DG		 2068 struct ltt_ust_channel *uchan;
2069
bec39940
DG		 2070 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2071 &iter.iter, uchan, node.node) {
b551a063
DG		 2072 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2073 channels[i].attr.overwrite = uchan->attr.overwrite;
2074 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2075 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2076 channels[i].attr.switch_timer_interval =
2077 uchan->attr.switch_timer_interval;
2078 channels[i].attr.read_timer_interval =
2079 uchan->attr.read_timer_interval;
aea829b3 2080 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2081 switch (uchan->attr.output) {
2082 case LTTNG_UST_MMAP:
2083 default:
2084 channels[i].attr.output = LTTNG_EVENT_MMAP;
2085 break;
2086 }
befe0905 2087 i++;
b551a063
DG		 2088 }
2089 break;
2090 }
2091 default:
2092 break;
2093 }
2094}
2095
2096/*
2097 * Create a list of ust global domain events.
2098 */
2099static int list_lttng_ust_global_events(char *channel_name,
2100 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2101{
2102 int i = 0, ret = 0;
2103 unsigned int nb_event = 0;
bec39940
DG		 2104 struct lttng_ht_iter iter;
2105 struct lttng_ht_node_str *node;
b551a063
DG		 2106 struct ltt_ust_channel *uchan;
2107 struct ltt_ust_event *uevent;
2108 struct lttng_event *tmp;
2109
2110 DBG("Listing UST global events for channel %s", channel_name);
2111
2112 rcu_read_lock();
2113
bec39940
DG		 2114 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2115 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG		 2116 if (node == NULL) {
2117 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2118 goto error;
b551a063
DG		 2119 }
2120
bec39940 2121 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2122
bec39940 2123 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2124
b551a063
DG		 2125 if (nb_event == 0) {
2126 ret = nb_event;
2127 goto error;
2128 }
2129
2130 DBG3("Listing UST global %d events", nb_event);
2131
2132 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2133 if (tmp == NULL) {
2134 ret = -LTTCOMM_FATAL;
2135 goto error;
2136 }
2137
bec39940 2138 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG		 2139 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2140 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2141 tmp[i].enabled = uevent->enabled;
2142 switch (uevent->attr.instrumentation) {
2143 case LTTNG_UST_TRACEPOINT:
2144 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2145 break;
2146 case LTTNG_UST_PROBE:
2147 tmp[i].type = LTTNG_EVENT_PROBE;
2148 break;
2149 case LTTNG_UST_FUNCTION:
2150 tmp[i].type = LTTNG_EVENT_FUNCTION;
2151 break;
ac3bd9c0 2152 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2153 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2154 break;
9f19cc17 2155 }
d7b75b30 2156 i++;
9f19cc17
DG		 2157 }
2158
b551a063
DG		 2159 ret = nb_event;
2160 *events = tmp;
2161
2162error:
2163 rcu_read_unlock();
2164 return ret;
9f19cc17
DG		 2165}
2166
2167/*
b551a063 2168 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2169 */
b551a063
DG		 2170static int list_lttng_kernel_events(char *channel_name,
2171 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2172{
b551a063
DG		 2173 int i = 0, ret;
2174 unsigned int nb_event;
9f19cc17 2175 struct ltt_kernel_event *event;
b551a063
DG		 2176 struct ltt_kernel_channel *kchan;
2177
2178 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2179 if (kchan == NULL) {
2180 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2181 goto error;
2182 }
2183
2184 nb_event = kchan->event_count;
9f19cc17
DG		 2185
2186 DBG("Listing events for channel %s", kchan->channel->name);
2187
b551a063
DG		 2188 if (nb_event == 0) {
2189 ret = nb_event;
2190 goto error;
2191 }
2192
2193 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2194 if (*events == NULL) {
2195 ret = LTTCOMM_FATAL;
2196 goto error;
2197 }
2198
9f19cc17
DG		 2199 /* Kernel channels */
2200 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2201 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2202 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2203 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2204 switch (event->event->instrumentation) {
2205 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2206 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2207 break;
2208 case LTTNG_KERNEL_KPROBE:
2209 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2210 (*events)[i].type = LTTNG_EVENT_PROBE;
2211 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2212 sizeof(struct lttng_kernel_kprobe));
2213 break;
2214 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2215 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2216 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2217 sizeof(struct lttng_kernel_function));
2218 break;
0133c199 2219 case LTTNG_KERNEL_NOOP:
b551a063 2220 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2221 break;
a54bd42d 2222 case LTTNG_KERNEL_SYSCALL:
b551a063 2223 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2224 break;
7a3d1328
MD		 2225 case LTTNG_KERNEL_ALL:
2226 assert(0);
2227 break;
9f19cc17
DG		 2228 }
2229 i++;
2230 }
b551a063
DG		 2231
2232 return nb_event;
2233
2234error:
2235 return ret;
9f19cc17
DG		 2236}
2237
fac6795d 2238/*
54d01ffb 2239 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2240 */
54d01ffb
DG		 2241static int cmd_disable_channel(struct ltt_session *session,
2242 int domain, char *channel_name)
fac6795d 2243{
54d01ffb 2244 int ret;
78f0bacd
DG		 2245 struct ltt_ust_session *usess;
2246
2247 usess = session->ust_session;
379473d2 2248
54d01ffb 2249 switch (domain) {
78f0bacd
DG		 2250 case LTTNG_DOMAIN_KERNEL:
2251 {
2252 ret = channel_kernel_disable(session->kernel_session,
2253 channel_name);
2254 if (ret != LTTCOMM_OK) {
2255 goto error;
2256 }
54d01ffb 2257
78f0bacd
DG		 2258 kernel_wait_quiescent(kernel_tracer_fd);
2259 break;
2260 }
2261 case LTTNG_DOMAIN_UST:
2262 {
2263 struct ltt_ust_channel *uchan;
bec39940 2264 struct lttng_ht *chan_ht;
78f0bacd 2265
7885e399
DG		 2266 chan_ht = usess->domain_global.channels;
2267
2268 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2269 if (uchan == NULL) {
2270 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2271 goto error;
78f0bacd
DG		 2272 }
2273
7885e399
DG		 2274 ret = channel_ust_disable(usess, domain, uchan);
2275 if (ret != LTTCOMM_OK) {
78f0bacd
DG		 2276 goto error;
2277 }
78f0bacd
DG		 2278 break;
2279 }
2280 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2281 case LTTNG_DOMAIN_UST_EXEC_NAME:
2282 case LTTNG_DOMAIN_UST_PID:
2283 ret = LTTCOMM_NOT_IMPLEMENTED;
2284 goto error;
2285 default:
2286 ret = LTTCOMM_UNKNOWN_DOMAIN;
2287 goto error;
20fe2104
DG		 2288 }
2289
54d01ffb 2290 ret = LTTCOMM_OK;
d65106b1 2291
54d01ffb
DG		 2292error:
2293 return ret;
2294}
2295
2296/*
2297 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2298 */
44d3bd01 2299static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2300 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2301{
2302 int ret;
f6a9efaa 2303 struct ltt_ust_session *usess = session->ust_session;
bec39940 2304 struct lttng_ht *chan_ht;
f6a9efaa 2305
5d56b5aa 2306 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2307
aea829b3 2308 switch (domain) {
44d3bd01
DG		 2309 case LTTNG_DOMAIN_KERNEL:
2310 {
2311 struct ltt_kernel_channel *kchan;
54d01ffb 2312
44d3bd01
DG		 2313 kchan = trace_kernel_get_channel_by_name(attr->name,
2314 session->kernel_session);
2315 if (kchan == NULL) {
2316 ret = channel_kernel_create(session->kernel_session,
2317 attr, kernel_poll_pipe[1]);
2318 } else {
2319 ret = channel_kernel_enable(session->kernel_session, kchan);
2320 }
2321
2322 if (ret != LTTCOMM_OK) {
2323 goto error;
2324 }
2325
2326 kernel_wait_quiescent(kernel_tracer_fd);
2327 break;
2328 }
f6a9efaa
DG		 2329 case LTTNG_DOMAIN_UST:
2330 {
2331 struct ltt_ust_channel *uchan;
2332
7885e399 2333 chan_ht = usess->domain_global.channels;
f6a9efaa 2334
7885e399 2335 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2336 if (uchan == NULL) {
7885e399 2337 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2338 } else {
7885e399 2339 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2340 }
f6a9efaa
DG		 2341 break;
2342 }
78f0bacd
DG		 2343 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2344 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2345 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG		 2346 ret = LTTCOMM_NOT_IMPLEMENTED;
2347 goto error;
44d3bd01
DG		 2348 default:
2349 ret = LTTCOMM_UNKNOWN_DOMAIN;
2350 goto error;
54d01ffb
DG		 2351 }
2352
54d01ffb
DG		 2353error:
2354 return ret;
2355}
2356
2357/*
2358 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2359 */
2360static int cmd_disable_event(struct ltt_session *session, int domain,
2361 char *channel_name, char *event_name)
2362{
2363 int ret;
54d01ffb
DG		 2364
2365 switch (domain) {
2366 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2367 {
2368 struct ltt_kernel_channel *kchan;
b0a40d28 2369 struct ltt_kernel_session *ksess;
2bdd86d4 2370
b0a40d28
DG		 2371 ksess = session->kernel_session;
2372
2373 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2374 if (kchan == NULL) {
2375 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2376 goto error;
d65106b1
DG		 2377 }
2378
b0a40d28 2379 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2380 if (ret != LTTCOMM_OK) {
2381 goto error;
2382 }
2383
2384 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2385 break;
2bdd86d4
MD		 2386 }
2387 case LTTNG_DOMAIN_UST:
b0a40d28 2388 {
b0a40d28 2389 struct ltt_ust_channel *uchan;
7f79d3a1 2390 struct ltt_ust_session *usess;
b0a40d28
DG		 2391
2392 usess = session->ust_session;
2393
2394 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2395 channel_name);
2396 if (uchan == NULL) {
2397 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2398 goto error;
2399 }
2400
7f79d3a1
DG		 2401 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2402 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2403 goto error;
2404 }
2405
7f79d3a1 2406 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2407 channel_name);
b0a40d28
DG		 2408 break;
2409 }
2bdd86d4
MD		 2410 case LTTNG_DOMAIN_UST_EXEC_NAME:
2411 case LTTNG_DOMAIN_UST_PID:
2412 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2413 default:
54d01ffb
DG		 2414 ret = LTTCOMM_NOT_IMPLEMENTED;
2415 goto error;
d65106b1 2416 }
26cc6b4e 2417
54d01ffb
DG		 2418 ret = LTTCOMM_OK;
2419
2420error:
2421 return ret;
2422}
2423
2424/*
2425 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2426 */
2427static int cmd_disable_event_all(struct ltt_session *session, int domain,
2428 char *channel_name)
2429{
2430 int ret;
54d01ffb
DG		 2431
2432 switch (domain) {
2433 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2434 {
2435 struct ltt_kernel_session *ksess;
2436 struct ltt_kernel_channel *kchan;
2437
2438 ksess = session->kernel_session;
2439
2440 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2441 if (kchan == NULL) {
2442 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2443 goto error;
26cc6b4e
DG		 2444 }
2445
9730260e 2446 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2447 if (ret != LTTCOMM_OK) {
0b97ec54 2448 goto error;
26cc6b4e
DG		 2449 }
2450
54d01ffb 2451 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2452 break;
9730260e
DG		 2453 }
2454 case LTTNG_DOMAIN_UST:
2455 {
2456 struct ltt_ust_session *usess;
2457 struct ltt_ust_channel *uchan;
2458
2459 usess = session->ust_session;
2460
2461 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2462 channel_name);
2463 if (uchan == NULL) {
2464 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2465 goto error;
2466 }
2467
7f79d3a1
DG		 2468 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2469 if (ret != 0) {
9730260e
DG		 2470 goto error;
2471 }
2472
7f79d3a1 2473 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2474
2475 break;
2476 }
2477 case LTTNG_DOMAIN_UST_EXEC_NAME:
2478 case LTTNG_DOMAIN_UST_PID:
2479 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2480 default:
54d01ffb
DG		 2481 ret = LTTCOMM_NOT_IMPLEMENTED;
2482 goto error;
26cc6b4e 2483 }
e953ef25 2484
54d01ffb 2485 ret = LTTCOMM_OK;
e953ef25 2486
54d01ffb
DG		 2487error:
2488 return ret;
2489}
f5177a38 2490
54d01ffb
DG		 2491/*
2492 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2493 */
2494static int cmd_add_context(struct ltt_session *session, int domain,
2495 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2496{
2497 int ret;
f5177a38 2498
54d01ffb
DG		 2499 switch (domain) {
2500 case LTTNG_DOMAIN_KERNEL:
2501 /* Add kernel context to kernel tracer */
2502 ret = context_kernel_add(session->kernel_session, ctx,
2503 event_name, channel_name);
2504 if (ret != LTTCOMM_OK) {
f5177a38 2505 goto error;
e953ef25 2506 }
2bdd86d4
MD		 2507 break;
2508 case LTTNG_DOMAIN_UST:
2509 {
55cc08a6 2510 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2511
55cc08a6
DG		 2512 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2513 if (ret != LTTCOMM_OK) {
2514 goto error;
2bdd86d4 2515 }
e953ef25 2516 break;
2bdd86d4 2517 }
55cc08a6
DG		 2518 case LTTNG_DOMAIN_UST_EXEC_NAME:
2519 case LTTNG_DOMAIN_UST_PID:
2520 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2521 default:
54d01ffb
DG		 2522 ret = LTTCOMM_NOT_IMPLEMENTED;
2523 goto error;
e953ef25 2524 }
950131af 2525
54d01ffb 2526 ret = LTTCOMM_OK;
950131af 2527
54d01ffb
DG		 2528error:
2529 return ret;
2530}
2531
2532/*
2533 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD		 2534 *
2535 * TODO: currently, both events and loglevels are kept within the same
2536 * namespace for UST global registry/app registery, so if an event
2537 * happen to have the same name as the loglevel (very unlikely though),
2538 * and an attempt is made to enable/disable both in the same session,
2539 * the first to be created will be the only one allowed to exist.
54d01ffb
DG		 2540 */
2541static int cmd_enable_event(struct ltt_session *session, int domain,
2542 char *channel_name, struct lttng_event *event)
2543{
2544 int ret;
f6cd6b0f 2545 struct lttng_channel *attr;
48842b30 2546 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2547
2548 switch (domain) {
2549 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2550 {
2551 struct ltt_kernel_channel *kchan;
2552
54d01ffb
DG		 2553 kchan = trace_kernel_get_channel_by_name(channel_name,
2554 session->kernel_session);
2555 if (kchan == NULL) {
f6cd6b0f
DG		 2556 attr = channel_new_default_attr(domain);
2557 if (attr == NULL) {
2558 ret = LTTCOMM_FATAL;
2559 goto error;
2560 }
2561 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2562
54d01ffb 2563 /* This call will notify the kernel thread */
44d3bd01 2564 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2565 attr, kernel_poll_pipe[1]);
54d01ffb 2566 if (ret != LTTCOMM_OK) {
ff4d74e6 2567 free(attr);
f5177a38
DG		 2568 goto error;
2569 }
ff4d74e6 2570 free(attr);
54d01ffb 2571 }
950131af 2572
54d01ffb
DG		 2573 /* Get the newly created kernel channel pointer */
2574 kchan = trace_kernel_get_channel_by_name(channel_name,
2575 session->kernel_session);
2576 if (kchan == NULL) {
2577 /* This sould not happen... */
2578 ret = LTTCOMM_FATAL;
2579 goto error;
2580 }
f5177a38 2581
48842b30
DG		 2582 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2583 event);
54d01ffb 2584 if (ret != LTTCOMM_OK) {
f5177a38 2585 goto error;
950131af
DG		 2586 }
2587
54d01ffb 2588 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2589 break;
2bdd86d4
MD		 2590 }
2591 case LTTNG_DOMAIN_UST:
2592 {
aea829b3 2593 struct lttng_channel *attr;
edb67388 2594 struct ltt_ust_channel *uchan;
2bdd86d4 2595
edb67388 2596 /* Get channel from global UST domain */
48842b30
DG		 2597 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2598 channel_name);
2599 if (uchan == NULL) {
aea829b3
DG		 2600 /* Create default channel */
2601 attr = channel_new_default_attr(domain);
2602 if (attr == NULL) {
2603 ret = LTTCOMM_FATAL;
2604 goto error;
2605 }
596219f7 2606 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2607 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2608
7885e399 2609 ret = channel_ust_create(usess, domain, attr);
edb67388 2610 if (ret != LTTCOMM_OK) {
ff4d74e6 2611 free(attr);
aea829b3
DG		 2612 goto error;
2613 }
aea829b3
DG		 2614 free(attr);
2615
2616 /* Get the newly created channel reference back */
2617 uchan = trace_ust_find_channel_by_name(
2618 usess->domain_global.channels, channel_name);
2619 if (uchan == NULL) {
2620 /* Something is really wrong */
2621 ret = LTTCOMM_FATAL;
2622 goto error;
2623 }
48842b30 2624 }
2bdd86d4 2625
edb67388 2626 /* At this point, the session and channel exist on the tracer */
edb67388
DG		 2627 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2628 if (ret != LTTCOMM_OK) {
48842b30 2629 goto error;
2bdd86d4
MD		 2630 }
2631 break;
2632 }
2633 case LTTNG_DOMAIN_UST_EXEC_NAME:
2634 case LTTNG_DOMAIN_UST_PID:
2635 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2636 default:
54d01ffb
DG		 2637 ret = LTTCOMM_NOT_IMPLEMENTED;
2638 goto error;
950131af 2639 }
d36b8583 2640
54d01ffb 2641 ret = LTTCOMM_OK;
d36b8583 2642
54d01ffb
DG		 2643error:
2644 return ret;
2645}
7d29a247 2646
54d01ffb
DG		 2647/*
2648 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2649 */
2650static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2651 char *channel_name, int event_type)
54d01ffb
DG		 2652{
2653 int ret;
2654 struct ltt_kernel_channel *kchan;
7d29a247 2655
54d01ffb
DG		 2656 switch (domain) {
2657 case LTTNG_DOMAIN_KERNEL:
2658 kchan = trace_kernel_get_channel_by_name(channel_name,
2659 session->kernel_session);
2660 if (kchan == NULL) {
2661 /* This call will notify the kernel thread */
44d3bd01
DG		 2662 ret = channel_kernel_create(session->kernel_session, NULL,
2663 kernel_poll_pipe[1]);
54d01ffb
DG		 2664 if (ret != LTTCOMM_OK) {
2665 goto error;
d36b8583 2666 }
0d0c377a 2667
8f69e5eb
DG		 2668 /* Get the newly created kernel channel pointer */
2669 kchan = trace_kernel_get_channel_by_name(channel_name,
2670 session->kernel_session);
2671 if (kchan == NULL) {
2672 /* This sould not happen... */
2673 ret = LTTCOMM_FATAL;
2674 goto error;
2675 }
2676
54d01ffb 2677 }
0fdd1e2c 2678
7a3d1328 2679 switch (event_type) {
76d45b40 2680 case LTTNG_EVENT_SYSCALL:
7a3d1328 2681 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2682 kchan, kernel_tracer_fd);
7a3d1328 2683 break;
76d45b40 2684 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2685 /*
7a3d1328
MD		 2686 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2687 * events already registered to the channel.
8c9ae521 2688 */
7a3d1328
MD		 2689 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2690 kchan, kernel_tracer_fd);
2691 break;
76d45b40 2692 case LTTNG_EVENT_ALL:
7a3d1328 2693 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2694 ret = event_kernel_enable_all(session->kernel_session,
2695 kchan, kernel_tracer_fd);
7a3d1328
MD		 2696 break;
2697 default:
2698 ret = LTTCOMM_KERN_ENABLE_FAIL;
2699 goto error;
8c9ae521 2700 }
8f69e5eb
DG		 2701
2702 /* Manage return value */
54d01ffb 2703 if (ret != LTTCOMM_OK) {
0d0c377a 2704 goto error;
d36b8583
DG		 2705 }
2706
54d01ffb 2707 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2708 break;
76d45b40
DG		 2709 case LTTNG_DOMAIN_UST:
2710 {
2711 struct lttng_channel *attr;
2712 struct ltt_ust_channel *uchan;
2713 struct ltt_ust_session *usess = session->ust_session;
2714
2715 /* Get channel from global UST domain */
2716 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2717 channel_name);
2718 if (uchan == NULL) {
2719 /* Create default channel */
2720 attr = channel_new_default_attr(domain);
2721 if (attr == NULL) {
2722 ret = LTTCOMM_FATAL;
2723 goto error;
2724 }
2725 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2726 attr->name[NAME_MAX - 1] = '\0';
2727
2728 /* Use the internal command enable channel */
7885e399 2729 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2730 if (ret != LTTCOMM_OK) {
2731 free(attr);
2732 goto error;
2733 }
2734 free(attr);
2735
2736 /* Get the newly created channel reference back */
2737 uchan = trace_ust_find_channel_by_name(
2738 usess->domain_global.channels, channel_name);
2739 if (uchan == NULL) {
2740 /* Something is really wrong */
2741 ret = LTTCOMM_FATAL;
2742 goto error;
2743 }
2744 }
2745
2746 /* At this point, the session and channel exist on the tracer */
2747
2748 switch (event_type) {
2749 case LTTNG_EVENT_ALL:
2750 case LTTNG_EVENT_TRACEPOINT:
2751 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2752 if (ret != LTTCOMM_OK) {
2753 goto error;
2754 }
2755 break;
2756 default:
2757 ret = LTTCOMM_UST_ENABLE_FAIL;
2758 goto error;
2759 }
2760
2761 /* Manage return value */
2762 if (ret != LTTCOMM_OK) {
2763 goto error;
2764 }
2765
2766 break;
2767 }
2768 case LTTNG_DOMAIN_UST_EXEC_NAME:
2769 case LTTNG_DOMAIN_UST_PID:
2770 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2771 default:
54d01ffb
DG		 2772 ret = LTTCOMM_NOT_IMPLEMENTED;
2773 goto error;
d36b8583 2774 }
f3ed775e 2775
54d01ffb
DG		 2776 ret = LTTCOMM_OK;
2777
2778error:
2779 return ret;
2780}
2781
2782/*
2783 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2784 */
2785static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2786{
2787 int ret;
2788 ssize_t nb_events = 0;
2789
2790 switch (domain) {
2791 case LTTNG_DOMAIN_KERNEL:
2792 nb_events = kernel_list_events(kernel_tracer_fd, events);
2793 if (nb_events < 0) {
2794 ret = LTTCOMM_KERN_LIST_FAIL;
2795 goto error;
894be886 2796 }
54d01ffb 2797 break;
b551a063
DG		 2798 case LTTNG_DOMAIN_UST:
2799 nb_events = ust_app_list_events(events);
2800 if (nb_events < 0) {
2801 ret = LTTCOMM_UST_LIST_FAIL;
2802 goto error;
2803 }
2804 break;
54d01ffb 2805 default:
54d01ffb
DG		 2806 ret = LTTCOMM_NOT_IMPLEMENTED;
2807 goto error;
2808 }
894be886 2809
54d01ffb 2810 return nb_events;
7d29a247 2811
54d01ffb
DG		 2812error:
2813 /* Return negative value to differentiate return code */
2814 return -ret;
2815}
b389abbe 2816
54d01ffb
DG		 2817/*
2818 * Command LTTNG_START_TRACE processed by the client thread.
2819 */
2820static int cmd_start_trace(struct ltt_session *session)
2821{
2822 int ret;
54d01ffb 2823 struct ltt_kernel_session *ksession;
b9d9b220 2824 struct ltt_ust_session *usess;
b389abbe 2825
54d01ffb
DG		 2826 /* Short cut */
2827 ksession = session->kernel_session;
b9d9b220 2828 usess = session->ust_session;
5eb91c98 2829
b9ef1c83
DG		 2830 if (session->enabled) {
2831 ret = LTTCOMM_UST_START_FAIL;
2832 goto error;
2833 }
2834
464dd62d
MD		 2835 session->enabled = 1;
2836
54d01ffb
DG		 2837 /* Kernel tracing */
2838 if (ksession != NULL) {
2bdd86d4
MD		 2839 struct ltt_kernel_channel *kchan;
2840
54d01ffb
DG		 2841 /* Open kernel metadata */
2842 if (ksession->metadata == NULL) {
2843 ret = kernel_open_metadata(ksession, ksession->trace_path);
2844 if (ret < 0) {
2845 ret = LTTCOMM_KERN_META_FAIL;
2846 goto error;
b389abbe 2847 }
54d01ffb 2848 }
7d29a247 2849
54d01ffb
DG		 2850 /* Open kernel metadata stream */
2851 if (ksession->metadata_stream_fd == 0) {
2852 ret = kernel_open_metadata_stream(ksession);
2853 if (ret < 0) {
2854 ERR("Kernel create metadata stream failed");
2855 ret = LTTCOMM_KERN_STREAM_FAIL;
2856 goto error;
2857 }
2858 }
2859
2860 /* For each channel */
2861 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2862 if (kchan->stream_count == 0) {
2863 ret = kernel_open_channel_stream(kchan);
2864 if (ret < 0) {
2865 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2866 goto error;
2867 }
54d01ffb
DG		 2868 /* Update the stream global counter */
2869 ksession->stream_count_global += ret;
7d29a247 2870 }
54d01ffb
DG		 2871 }
2872
2873 /* Setup kernel consumer socket and send fds to it */
2874 ret = init_kernel_tracing(ksession);
2875 if (ret < 0) {
2876 ret = LTTCOMM_KERN_START_FAIL;
2877 goto error;
2878 }
2879
2880 /* This start the kernel tracing */
2881 ret = kernel_start_session(ksession);
2882 if (ret < 0) {
2883 ret = LTTCOMM_KERN_START_FAIL;
2884 goto error;
2885 }
2886
2887 /* Quiescent wait after starting trace */
2888 kernel_wait_quiescent(kernel_tracer_fd);
2889 }
2890
36dc12cc 2891 /* Flag session that trace should start automatically */
b9d9b220
DG		 2892 if (usess) {
2893 usess->start_trace = 1;
36dc12cc 2894
b9d9b220
DG		 2895 ret = ust_app_start_trace_all(usess);
2896 if (ret < 0) {
2897 ret = LTTCOMM_UST_START_FAIL;
2898 goto error;
2899 }
2bdd86d4 2900 }
54d01ffb
DG		 2901
2902 ret = LTTCOMM_OK;
2903
2904error:
2905 return ret;
2906}
2907
2908/*
2909 * Command LTTNG_STOP_TRACE processed by the client thread.
2910 */
2911static int cmd_stop_trace(struct ltt_session *session)
2912{
2913 int ret;
2914 struct ltt_kernel_channel *kchan;
2915 struct ltt_kernel_session *ksession;
8be98f9a 2916 struct ltt_ust_session *usess;
54d01ffb
DG		 2917
2918 /* Short cut */
2919 ksession = session->kernel_session;
8be98f9a 2920 usess = session->ust_session;
54d01ffb 2921
b9ef1c83 2922 if (!session->enabled) {
190df5ac 2923 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG		 2924 goto error;
2925 }
2926
464dd62d
MD		 2927 session->enabled = 0;
2928
54d01ffb
DG		 2929 /* Kernel tracer */
2930 if (ksession != NULL) {
2931 DBG("Stop kernel tracing");
2932
2933 /* Flush all buffers before stopping */
2934 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2935 if (ret < 0) {
2936 ERR("Kernel metadata flush failed");
2937 }
f34daff7 2938
54d01ffb
DG		 2939 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2940 ret = kernel_flush_buffer(kchan);
0d0c377a 2941 if (ret < 0) {
54d01ffb 2942 ERR("Kernel flush buffer error");
7d29a247 2943 }
54d01ffb 2944 }
19e70852 2945
54d01ffb
DG		 2946 ret = kernel_stop_session(ksession);
2947 if (ret < 0) {
2948 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2949 goto error;
f3ed775e 2950 }
54d01ffb
DG		 2951
2952 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2953 }
54d01ffb 2954
8be98f9a
MD		 2955 if (usess) {
2956 usess->start_trace = 0;
2bdd86d4 2957
8be98f9a 2958 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2959 if (ret < 0) {
190df5ac 2960 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD		 2961 goto error;
2962 }
2bdd86d4 2963 }
54d01ffb
DG		 2964
2965 ret = LTTCOMM_OK;
2966
2967error:
2968 return ret;
2969}
2970
2971/*
2972 * Command LTTNG_CREATE_SESSION processed by the client thread.
2973 */
6df2e2c9 2974static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG		 2975{
2976 int ret;
2977
6df2e2c9 2978 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG		 2979 if (ret != LTTCOMM_OK) {
2980 goto error;
2981 }
2982
2983 ret = LTTCOMM_OK;
2984
2985error:
2986 return ret;
2987}
2988
2989/*
2990 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2991 */
2992static int cmd_destroy_session(struct ltt_session *session, char *name)
2993{
2994 int ret;
2995
2996 /* Clean kernel session teardown */
2997 teardown_kernel_session(session);
84cd17c6
MD		 2998 /* UST session teardown */
2999 teardown_ust_session(session);
54d01ffb
DG		 3000
3001 /*
3002 * Must notify the kernel thread here to update it's poll setin order
3003 * to remove the channel(s)' fd just destroyed.
3004 */
3005 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3006 if (ret < 0) {
3007 perror("write kernel poll pipe");
3008 }
3009
271933a4 3010 ret = session_destroy(session);
54d01ffb
DG		 3011
3012 return ret;
3013}
3014
3015/*
3016 * Command LTTNG_CALIBRATE processed by the client thread.
3017 */
3018static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3019{
3020 int ret;
3021
3022 switch (domain) {
3023 case LTTNG_DOMAIN_KERNEL:
33a2b854 3024 {
54d01ffb 3025 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3026
54d01ffb
DG		 3027 kcalibrate.type = calibrate->type;
3028 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3029 if (ret < 0) {
54d01ffb
DG		 3030 ret = LTTCOMM_KERN_ENABLE_FAIL;
3031 goto error;
33a2b854 3032 }
54d01ffb
DG		 3033 break;
3034 }
3035 default:
3036 /* TODO: Userspace tracing */
3037 ret = LTTCOMM_NOT_IMPLEMENTED;
3038 goto error;
3039 }
33a2b854 3040
54d01ffb 3041 ret = LTTCOMM_OK;
33a2b854 3042
54d01ffb
DG		 3043error:
3044 return ret;
3045}
7d29a247 3046
54d01ffb
DG		 3047/*
3048 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3049 */
3050static int cmd_register_consumer(struct ltt_session *session, int domain,
3051 char *sock_path)
3052{
3053 int ret, sock;
b389abbe 3054
54d01ffb
DG		 3055 switch (domain) {
3056 case LTTNG_DOMAIN_KERNEL:
3057 /* Can't register a consumer if there is already one */
48c4f28c 3058 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 3059 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3060 goto error;
3061 }
3062
3063 sock = lttcomm_connect_unix_sock(sock_path);
3064 if (sock < 0) {
3065 ret = LTTCOMM_CONNECT_FAIL;
3066 goto error;
3067 }
3068
3069 session->kernel_session->consumer_fd = sock;
3070 break;
3071 default:
3072 /* TODO: Userspace tracing */
3073 ret = LTTCOMM_NOT_IMPLEMENTED;
3074 goto error;
3075 }
3076
3077 ret = LTTCOMM_OK;
3078
3079error:
3080 return ret;
3081}
3082
3083/*
3084 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3085 */
3086static ssize_t cmd_list_domains(struct ltt_session *session,
3087 struct lttng_domain **domains)
3088{
b551a063 3089 int ret, index = 0;
54d01ffb
DG		 3090 ssize_t nb_dom = 0;
3091
3092 if (session->kernel_session != NULL) {
b551a063 3093 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3094 nb_dom++;
3095 }
3096
b551a063
DG		 3097 if (session->ust_session != NULL) {
3098 DBG3("Listing domains found UST global domain");
3099 nb_dom++;
3100 }
54d01ffb 3101
b551a063 3102 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3103 if (*domains == NULL) {
3104 ret = -LTTCOMM_FATAL;
3105 goto error;
3106 }
3107
b551a063
DG		 3108 if (session->kernel_session != NULL) {
3109 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3110 index++;
3111 }
3112
3113 if (session->ust_session != NULL) {
3114 (*domains)[index].type = LTTNG_DOMAIN_UST;
3115 index++;
3116 }
54d01ffb 3117
54d01ffb
DG		 3118 return nb_dom;
3119
3120error:
3121 return ret;
3122}
3123
3124/*
3125 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3126 */
b551a063 3127static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3128 struct lttng_channel **channels)
3129{
3130 int ret;
3131 ssize_t nb_chan = 0;
3132
b551a063
DG		 3133 switch (domain) {
3134 case LTTNG_DOMAIN_KERNEL:
3135 if (session->kernel_session != NULL) {
3136 nb_chan = session->kernel_session->channel_count;
3137 }
0df502fd 3138 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3139 break;
3140 case LTTNG_DOMAIN_UST:
3141 if (session->ust_session != NULL) {
bec39940 3142 nb_chan = lttng_ht_get_count(
b551a063
DG		 3143 session->ust_session->domain_global.channels);
3144 }
0df502fd 3145 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3146 break;
3147 default:
3148 *channels = NULL;
3149 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3150 goto error;
3151 }
3152
b551a063
DG		 3153 if (nb_chan > 0) {
3154 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3155 if (*channels == NULL) {
3156 ret = -LTTCOMM_FATAL;
3157 goto error;
3158 }
54d01ffb 3159
b551a063
DG		 3160 list_lttng_channels(domain, session, *channels);
3161 } else {
3162 *channels = NULL;
3163 }
2bdd86d4 3164
54d01ffb
DG		 3165 return nb_chan;
3166
3167error:
3168 return ret;
3169}
3170
3171/*
3172 * Command LTTNG_LIST_EVENTS processed by the client thread.
3173 */
b551a063 3174static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3175 char *channel_name, struct lttng_event **events)
3176{
b551a063 3177 int ret = 0;
54d01ffb 3178 ssize_t nb_event = 0;
54d01ffb 3179
b551a063
DG		 3180 switch (domain) {
3181 case LTTNG_DOMAIN_KERNEL:
3182 if (session->kernel_session != NULL) {
3183 nb_event = list_lttng_kernel_events(channel_name,
3184 session->kernel_session, events);
54d01ffb 3185 }
b551a063
DG		 3186 break;
3187 case LTTNG_DOMAIN_UST:
3188 {
3189 if (session->ust_session != NULL) {
3190 nb_event = list_lttng_ust_global_events(channel_name,
3191 &session->ust_session->domain_global, events);
3192 }
3193 break;
54d01ffb 3194 }
b551a063
DG		 3195 default:
3196 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3197 goto error;
3198 }
3199
b551a063 3200 ret = nb_event;
54d01ffb
DG		 3201
3202error:
3203 return ret;
3204}
3205
3206/*
3207 * Process the command requested by the lttng client within the command
3208 * context structure. This function make sure that the return structure (llm)
3209 * is set and ready for transmission before returning.
3210 *
3211 * Return any error encountered or 0 for success.
3212 */
3213static int process_client_msg(struct command_ctx *cmd_ctx)
3214{
3215 int ret = LTTCOMM_OK;
44d3bd01 3216 int need_tracing_session = 1;
54d01ffb
DG		 3217
3218 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3219
4fba7219
DG		 3220 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3221 ret = LTTCOMM_KERN_NA;
3222 goto error;
3223 }
3224
54d01ffb
DG		 3225 /*
3226 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3227 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3228 * command.
3229 */
3230 switch(cmd_ctx->lsm->cmd_type) {
3231 case LTTNG_LIST_SESSIONS:
3232 case LTTNG_LIST_TRACEPOINTS:
3233 case LTTNG_LIST_DOMAINS:
3234 case LTTNG_LIST_CHANNELS:
3235 case LTTNG_LIST_EVENTS:
3236 break;
3237 default:
3238 /* Setup lttng message with no payload */
3239 ret = setup_lttng_msg(cmd_ctx, 0);
3240 if (ret < 0) {
3241 /* This label does not try to unlock the session */
3242 goto init_setup_error;
3243 }
3244 }
3245
3246 /* Commands that DO NOT need a session. */
3247 switch (cmd_ctx->lsm->cmd_type) {
3248 case LTTNG_CALIBRATE:
3249 case LTTNG_CREATE_SESSION:
3250 case LTTNG_LIST_SESSIONS:
3251 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3252 need_tracing_session = 0;
54d01ffb
DG		 3253 break;
3254 default:
3255 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3256 session_lock_list();
54d01ffb 3257 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3258 session_unlock_list();
54d01ffb
DG		 3259 if (cmd_ctx->session == NULL) {
3260 if (cmd_ctx->lsm->session.name != NULL) {
3261 ret = LTTCOMM_SESS_NOT_FOUND;
3262 } else {
3263 /* If no session name specified */
3264 ret = LTTCOMM_SELECT_SESS;
3265 }
3266 goto error;
3267 } else {
3268 /* Acquire lock for the session */
3269 session_lock(cmd_ctx->session);
3270 }
3271 break;
3272 }
b389abbe 3273
54d01ffb
DG		 3274 /*
3275 * Check domain type for specific "pre-action".
3276 */
3277 switch (cmd_ctx->lsm->domain.type) {
3278 case LTTNG_DOMAIN_KERNEL:
3279 /* Kernel tracer check */
3280 if (kernel_tracer_fd == 0) {
3281 /* Basically, load kernel tracer modules */
3282 init_kernel_tracer();
3283 if (kernel_tracer_fd == 0) {
3284 ret = LTTCOMM_KERN_NA;
3285 goto error;
3286 }
3287 }
5eb91c98 3288
54d01ffb 3289 /* Need a session for kernel command */
44d3bd01 3290 if (need_tracing_session) {
54d01ffb 3291 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 3292 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3293 if (ret < 0) {
54d01ffb 3294 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3295 goto error;
3296 }
b389abbe 3297 }
7d29a247 3298
54d01ffb 3299 /* Start the kernel consumer daemon */
3bd1e081
MD		 3300 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3301 if (kconsumer_data.pid == 0 &&
54d01ffb 3302 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3303 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3304 ret = start_consumerd(&kconsumer_data);
7d29a247 3305 if (ret < 0) {
54d01ffb
DG		 3306 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3307 goto error;
950131af 3308 }
3ff2ecac
MD		 3309 } else {
3310 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3311 }
0d0c377a 3312 }
54d01ffb 3313 break;
2bdd86d4 3314 case LTTNG_DOMAIN_UST:
44d3bd01 3315 {
44d3bd01 3316 if (need_tracing_session) {
f6a9efaa 3317 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3318 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3319 &cmd_ctx->lsm->domain);
44d3bd01
DG		 3320 if (ret != LTTCOMM_OK) {
3321 goto error;
3322 }
3323 }
7753dea8
MD		 3324 /* Start the UST consumer daemons */
3325 /* 64-bit */
3326 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3327 if (consumerd64_bin[0] != '\0' &&
7753dea8 3328 ustconsumer64_data.pid == 0 &&
2bdd86d4 3329 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3330 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3331 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3332 if (ret < 0) {
7753dea8
MD		 3333 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3334 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3335 goto error;
3336 }
48842b30 3337
7753dea8 3338 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3339 } else {
7753dea8
MD		 3340 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3341 }
3342 /* 32-bit */
fc7a59ce 3343 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3344 ustconsumer32_data.pid == 0 &&
3345 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3346 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3347 ret = start_consumerd(&ustconsumer32_data);
3348 if (ret < 0) {
3349 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3350 ust_consumerd32_fd = -EINVAL;
3351 goto error;
3352 }
3353 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3354 } else {
3355 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3356 }
44d3bd01
DG		 3357 }
3358 break;
48842b30 3359 }
54d01ffb 3360 default:
54d01ffb
DG		 3361 break;
3362 }
33a2b854 3363
8e0af1b4
MD		 3364 /*
3365 * Check that the UID or GID match that of the tracing session.
3366 * The root user can interact with all sessions.
3367 */
3368 if (need_tracing_session) {
3369 if (!session_access_ok(cmd_ctx->session,
3370 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3371 ret = LTTCOMM_EPERM;
3372 goto error;
3373 }
3374 }
3375
54d01ffb
DG		 3376 /* Process by command type */
3377 switch (cmd_ctx->lsm->cmd_type) {
3378 case LTTNG_ADD_CONTEXT:
3379 {
3380 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3381 cmd_ctx->lsm->u.context.channel_name,
3382 cmd_ctx->lsm->u.context.event_name,
3383 &cmd_ctx->lsm->u.context.ctx);
3384 break;
3385 }
3386 case LTTNG_DISABLE_CHANNEL:
3387 {
3388 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3389 cmd_ctx->lsm->u.disable.channel_name);
3390 break;
3391 }
3392 case LTTNG_DISABLE_EVENT:
3393 {
3394 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3395 cmd_ctx->lsm->u.disable.channel_name,
3396 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3397 ret = LTTCOMM_OK;
3398 break;
3399 }
54d01ffb
DG		 3400 case LTTNG_DISABLE_ALL_EVENT:
3401 {
2bdd86d4 3402 DBG("Disabling all events");
54d01ffb
DG		 3403
3404 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3405 cmd_ctx->lsm->u.disable.channel_name);
3406 break;
3407 }
3408 case LTTNG_ENABLE_CHANNEL:
3409 {
aea829b3 3410 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3411 &cmd_ctx->lsm->u.channel.chan);
3412 break;
3413 }
3414 case LTTNG_ENABLE_EVENT:
3415 {
3416 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3417 cmd_ctx->lsm->u.enable.channel_name,
3418 &cmd_ctx->lsm->u.enable.event);
3419 break;
3420 }
3421 case LTTNG_ENABLE_ALL_EVENT:
3422 {
2bdd86d4 3423 DBG("Enabling all events");
54d01ffb
DG		 3424
3425 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3426 cmd_ctx->lsm->u.enable.channel_name,
3427 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3428 break;
3429 }
052da939 3430 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3431 {
9f19cc17 3432 struct lttng_event *events;
54d01ffb 3433 ssize_t nb_events;
052da939 3434
54d01ffb
DG		 3435 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3436 if (nb_events < 0) {
3437 ret = -nb_events;
3438 goto error;
2ef84c95
DG		 3439 }
3440
3441 /*
3442 * Setup lttng message with payload size set to the event list size in
3443 * bytes and then copy list into the llm payload.
3444 */
052da939 3445 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3446 if (ret < 0) {
052da939 3447 free(events);
2ef84c95
DG		 3448 goto setup_error;
3449 }
3450
3451 /* Copy event list into message payload */
9f19cc17 3452 memcpy(cmd_ctx->llm->payload, events,
052da939 3453 sizeof(struct lttng_event) * nb_events);
2ef84c95 3454
9f19cc17 3455 free(events);
2ef84c95
DG		 3456
3457 ret = LTTCOMM_OK;
3458 break;
3459 }
f3ed775e 3460 case LTTNG_START_TRACE:
8c0faa1d 3461 {
54d01ffb 3462 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3463 break;
3464 }
f3ed775e 3465 case LTTNG_STOP_TRACE:
8c0faa1d 3466 {
54d01ffb 3467 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3468 break;
3469 }
5e16da05
MD		 3470 case LTTNG_CREATE_SESSION:
3471 {
54d01ffb 3472 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3473 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
5e16da05
MD		 3474 break;
3475 }
3476 case LTTNG_DESTROY_SESSION:
3477 {
54d01ffb
DG		 3478 ret = cmd_destroy_session(cmd_ctx->session,
3479 cmd_ctx->lsm->session.name);
5461b305 3480 break;
5e16da05 3481 }
9f19cc17 3482 case LTTNG_LIST_DOMAINS:
5e16da05 3483 {
54d01ffb
DG		 3484 ssize_t nb_dom;
3485 struct lttng_domain *domains;
5461b305 3486
54d01ffb
DG		 3487 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3488 if (nb_dom < 0) {
3489 ret = -nb_dom;
3490 goto error;
ce3d728c 3491 }
520ff687 3492
54d01ffb 3493 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3494 if (ret < 0) {
3495 goto setup_error;
520ff687 3496 }
57167058 3497
54d01ffb
DG		 3498 /* Copy event list into message payload */
3499 memcpy(cmd_ctx->llm->payload, domains,
3500 nb_dom * sizeof(struct lttng_domain));
3501
3502 free(domains);
5e16da05 3503
5461b305 3504 ret = LTTCOMM_OK;
5e16da05
MD		 3505 break;
3506 }
9f19cc17 3507 case LTTNG_LIST_CHANNELS:
5e16da05 3508 {
54d01ffb
DG		 3509 size_t nb_chan;
3510 struct lttng_channel *channels;
3511
b551a063
DG		 3512 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3513 cmd_ctx->session, &channels);
54d01ffb
DG		 3514 if (nb_chan < 0) {
3515 ret = -nb_chan;
3516 goto error;
5461b305 3517 }
ca95a216 3518
54d01ffb 3519 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3520 if (ret < 0) {
3521 goto setup_error;
3522 }
9f19cc17 3523
54d01ffb
DG		 3524 /* Copy event list into message payload */
3525 memcpy(cmd_ctx->llm->payload, channels,
3526 nb_chan * sizeof(struct lttng_channel));
3527
3528 free(channels);
9f19cc17
DG		 3529
3530 ret = LTTCOMM_OK;
5461b305 3531 break;
5e16da05 3532 }
9f19cc17 3533 case LTTNG_LIST_EVENTS:
5e16da05 3534 {
b551a063 3535 ssize_t nb_event;
684d34d2 3536 struct lttng_event *events = NULL;
9f19cc17 3537
b551a063 3538 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3539 cmd_ctx->lsm->u.list.channel_name, &events);
3540 if (nb_event < 0) {
3541 ret = -nb_event;
3542 goto error;
5461b305 3543 }
ca95a216 3544
54d01ffb 3545 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3546 if (ret < 0) {
3547 goto setup_error;
3548 }
9f19cc17 3549
54d01ffb
DG		 3550 /* Copy event list into message payload */
3551 memcpy(cmd_ctx->llm->payload, events,
3552 nb_event * sizeof(struct lttng_event));
9f19cc17 3553
54d01ffb 3554 free(events);
9f19cc17
DG		 3555
3556 ret = LTTCOMM_OK;
5461b305 3557 break;
5e16da05
MD		 3558 }
3559 case LTTNG_LIST_SESSIONS:
3560 {
8e0af1b4 3561 unsigned int nr_sessions;
5461b305 3562
8e0af1b4
MD		 3563 session_lock_list();
3564 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3565 if (nr_sessions == 0) {
f3ed775e 3566 ret = LTTCOMM_NO_SESSION;
54d01ffb 3567 session_unlock_list();
5461b305 3568 goto error;
57167058 3569 }
8e0af1b4 3570 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3571 if (ret < 0) {
54d01ffb 3572 session_unlock_list();
5461b305 3573 goto setup_error;
e065084a 3574 }
5e16da05 3575
6c9cc2ab 3576 /* Filled the session array */
8e0af1b4
MD		 3577 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3578 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
6c9cc2ab 3579
54d01ffb 3580 session_unlock_list();
5e16da05 3581
5461b305 3582 ret = LTTCOMM_OK;
5e16da05
MD		 3583 break;
3584 }
d0254c7c
MD		 3585 case LTTNG_CALIBRATE:
3586 {
54d01ffb
DG		 3587 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3588 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3589 break;
3590 }
d9800920
DG		 3591 case LTTNG_REGISTER_CONSUMER:
3592 {
54d01ffb
DG		 3593 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3594 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3595 break;
3596 }
5e16da05 3597 default:
5e16da05 3598 ret = LTTCOMM_UND;
5461b305 3599 break;
fac6795d
DG		 3600 }
3601
5461b305 3602error:
5461b305
DG		 3603 if (cmd_ctx->llm == NULL) {
3604 DBG("Missing llm structure. Allocating one.");
894be886 3605 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3606 goto setup_error;
3607 }
3608 }
54d01ffb 3609 /* Set return code */
5461b305 3610 cmd_ctx->llm->ret_code = ret;
5461b305 3611setup_error:
b5541356 3612 if (cmd_ctx->session) {
54d01ffb 3613 session_unlock(cmd_ctx->session);
b5541356 3614 }
54d01ffb 3615init_setup_error:
8028d920 3616 return ret;
fac6795d
DG		 3617}
3618
1d4b027a 3619/*
d063d709
DG		 3620 * This thread manage all clients request using the unix client socket for
3621 * communication.
1d4b027a
DG		 3622 */
3623static void *thread_manage_clients(void *data)
3624{
5eb91c98
DG		 3625 int sock = 0, ret, i, pollfd;
3626 uint32_t revents, nb_fd;
273ea72c 3627 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3628 struct lttng_poll_event events;
1d4b027a
DG		 3629
3630 DBG("[thread] Manage client started");
3631
f6a9efaa
DG		 3632 rcu_register_thread();
3633
1d4b027a
DG		 3634 ret = lttcomm_listen_unix_sock(client_sock);
3635 if (ret < 0) {
3636 goto error;
3637 }
3638
5eb91c98
DG		 3639 /*
3640 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3641 * more will be added to this poll set.
3642 */
3643 ret = create_thread_poll_set(&events, 2);
3644 if (ret < 0) {
3645 goto error;
3646 }
273ea72c 3647
5eb91c98
DG		 3648 /* Add the application registration socket */
3649 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3650 if (ret < 0) {
3651 goto error;
3652 }
273ea72c 3653
bbd973c2
DG		 3654 /*
3655 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3656 */
3657 if (opt_sig_parent) {
3658 kill(ppid, SIGCHLD);
3659 }
3660
3661 while (1) {
1d4b027a 3662 DBG("Accepting client command ...");
273ea72c 3663
5eb91c98
DG		 3664 nb_fd = LTTNG_POLL_GETNB(&events);
3665
273ea72c 3666 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3667 ret = lttng_poll_wait(&events, -1);
273ea72c 3668 if (ret < 0) {
273ea72c
DG		 3669 goto error;
3670 }
3671
5eb91c98
DG		 3672 for (i = 0; i < nb_fd; i++) {
3673 /* Fetch once the poll data */
3674 revents = LTTNG_POLL_GETEV(&events, i);
3675 pollfd = LTTNG_POLL_GETFD(&events, i);
3676
3677 /* Thread quit pipe has been closed. Killing thread. */
3678 ret = check_thread_quit_pipe(pollfd, revents);
3679 if (ret) {
3680 goto error;
3681 }
3682
3683 /* Event on the registration socket */
3684 if (pollfd == client_sock) {
3685 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3686 ERR("Client socket poll error");
3687 goto error;
3688 }
3689 }
3690 }
3691
3692 DBG("Wait for client response");
3693
3694 sock = lttcomm_accept_unix_sock(client_sock);
3695 if (sock < 0) {
273ea72c 3696 goto error;
273ea72c
DG		 3697 }
3698
be040666
DG		 3699 /* Set socket option for credentials retrieval */
3700 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3701 if (ret < 0) {
3702 goto error;
3703 }
3704
5eb91c98 3705 /* Allocate context command to process the client request */
ba7f0ae5 3706 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3707 if (cmd_ctx == NULL) {
ba7f0ae5 3708 perror("zmalloc cmd_ctx");
1d4b027a 3709 goto error;
5eb91c98 3710 }
1d4b027a 3711
5eb91c98 3712 /* Allocate data buffer for reception */
ba7f0ae5 3713 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3714 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3715 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3716 goto error;
3717 }
1d4b027a 3718
5eb91c98
DG		 3719 cmd_ctx->llm = NULL;
3720 cmd_ctx->session = NULL;
1d4b027a 3721
5eb91c98
DG		 3722 /*
3723 * Data is received from the lttng client. The struct
3724 * lttcomm_session_msg (lsm) contains the command and data request of
3725 * the client.
3726 */
3727 DBG("Receiving data from client ...");
be040666
DG		 3728 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3729 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG		 3730 if (ret <= 0) {
3731 DBG("Nothing recv() from client... continuing");
3732 close(sock);
3733 free(cmd_ctx);
3734 continue;
3735 }
1d4b027a 3736
5eb91c98
DG		 3737 // TODO: Validate cmd_ctx including sanity check for
3738 // security purpose.
f7776ea7 3739
f6a9efaa 3740 rcu_thread_online();
5eb91c98
DG		 3741 /*
3742 * This function dispatch the work to the kernel or userspace tracer
3743 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3744 * informations for the client. The command context struct contains
3745 * everything this function may needs.
3746 */
3747 ret = process_client_msg(cmd_ctx);
f6a9efaa 3748 rcu_thread_offline();
5eb91c98 3749 if (ret < 0) {
bbd973c2 3750 /*
5eb91c98 3751 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3752 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3753 * (ENOMEM). Error detected but still accept command.
bbd973c2 3754 */
bbd973c2 3755 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3756 continue;
3757 }
d6e4fca4 3758
54d01ffb
DG		 3759 DBG("Sending response (size: %d, retcode: %s)",
3760 cmd_ctx->lttng_msg_size,
9a745bc7 3761 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3762 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3763 if (ret < 0) {
3764 ERR("Failed to send data back to client");
bbd973c2 3765 }
1d4b027a 3766
5eb91c98 3767 /* End of transmission */
273ea72c 3768 close(sock);
be040666
DG		 3769
3770 clean_command_ctx(&cmd_ctx);
273ea72c
DG		 3771 }
3772
5eb91c98
DG		 3773error:
3774 DBG("Client thread dying");
273ea72c 3775 unlink(client_unix_sock_path);
5eb91c98
DG		 3776 close(client_sock);
3777 close(sock);
273ea72c 3778
5eb91c98 3779 lttng_poll_clean(&events);
a2fb29a5 3780 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3781
3782 rcu_unregister_thread();
1d4b027a
DG		 3783 return NULL;
3784}
3785
3786
fac6795d
DG		 3787/*
3788 * usage function on stderr
3789 */
3790static void usage(void)
3791{
b716ce68 3792 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3793 fprintf(stderr, " -h, --help Display this usage.\n");
3794 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3795 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3796 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3797 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3798 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3799 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3800 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3801 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3802 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3803 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3804 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3805 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3806 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3807 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3808 fprintf(stderr, " -V, --version Show version number.\n");
3809 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3810 fprintf(stderr, " -q, --quiet No output at all.\n");
3811 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3812 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3813 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3814}
3815
3816/*
3817 * daemon argument parsing
3818 */
3819static int parse_args(int argc, char **argv)
3820{
3821 int c;
3822
3823 static struct option long_options[] = {
3824 { "client-sock", 1, 0, 'c' },
3825 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3826 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3827 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3828 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3829 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3830 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3831 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3832 { "consumerd32-path", 1, 0, 'u' },
3833 { "consumerd32-libdir", 1, 0, 'U' },
3834 { "consumerd64-path", 1, 0, 't' },
3835 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3836 { "daemonize", 0, 0, 'd' },
5b8719f5 3837 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3838 { "help", 0, 0, 'h' },
3839 { "group", 1, 0, 'g' },
3840 { "version", 0, 0, 'V' },
75462a81 3841 { "quiet", 0, 0, 'q' },
3f9947db 3842 { "verbose", 0, 0, 'v' },
3bd1e081 3843 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3844 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3845 { NULL, 0, 0, 0 }
3846 };
3847
3848 while (1) {
3849 int option_index = 0;
4fba7219 3850 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3851 long_options, &option_index);
fac6795d
DG		 3852 if (c == -1) {
3853 break;
3854 }
3855
3856 switch (c) {
3857 case 0:
3858 fprintf(stderr, "option %s", long_options[option_index].name);
3859 if (optarg) {
3860 fprintf(stderr, " with arg %s\n", optarg);
3861 }
3862 break;
b716ce68 3863 case 'c':
fac6795d
DG		 3864 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3865 break;
3866 case 'a':
3867 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3868 break;
3869 case 'd':
3870 opt_daemon = 1;
3871 break;
3872 case 'g':
fb09408a 3873 opt_tracing_group = optarg;
fac6795d
DG		 3874 break;
3875 case 'h':
3876 usage();
3877 exit(EXIT_FAILURE);
3878 case 'V':
3879 fprintf(stdout, "%s\n", VERSION);
3880 exit(EXIT_SUCCESS);
5b8719f5
DG		 3881 case 'S':
3882 opt_sig_parent = 1;
3883 break;
d6f42150 3884 case 'E':
3bd1e081 3885 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3886 break;
3887 case 'C':
3bd1e081
MD		 3888 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3889 break;
3890 case 'F':
7753dea8 3891 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3892 break;
3893 case 'D':
7753dea8
MD		 3894 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3895 break;
3896 case 'H':
3897 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3898 break;
3899 case 'G':
3900 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3901 break;
4fba7219
DG		 3902 case 'N':
3903 opt_no_kernel = 1;
3904 break;
75462a81
DG		 3905 case 'q':
3906 opt_quiet = 1;
3907 break;
3f9947db 3908 case 'v':
53086306
DG		 3909 /* Verbose level can increase using multiple -v */
3910 opt_verbose += 1;
3f9947db 3911 break;
31f73cc9 3912 case 'Z':
3bd1e081 3913 opt_verbose_consumer += 1;
31f73cc9 3914 break;
fb09408a 3915 case 'u':
fc7a59ce 3916 consumerd32_bin= optarg;
ebaeda94
MD		 3917 break;
3918 case 'U':
3919 consumerd32_libdir = optarg;
7753dea8
MD		 3920 break;
3921 case 't':
fc7a59ce 3922 consumerd64_bin = optarg;
ebaeda94
MD		 3923 break;
3924 case 'T':
3925 consumerd64_libdir = optarg;
fb09408a 3926 break;
fac6795d
DG		 3927 default:
3928 /* Unknown option or other error.
3929 * Error is printed by getopt, just return */
3930 return -1;
3931 }
3932 }
3933
3934 return 0;
3935}
3936
3937/*
d063d709 3938 * Creates the two needed socket by the daemon.
d6f42150
DG		 3939 * apps_sock - The communication socket for all UST apps.
3940 * client_sock - The communication of the cli tool (lttng).
fac6795d 3941 */
cf3af59e 3942static int init_daemon_socket(void)
fac6795d
DG		 3943{
3944 int ret = 0;
3945 mode_t old_umask;
3946
3947 old_umask = umask(0);
3948
3949 /* Create client tool unix socket */
d6f42150
DG		 3950 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3951 if (client_sock < 0) {
3952 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3953 ret = -1;
3954 goto end;
3955 }
3956
3957 /* File permission MUST be 660 */
3958 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3959 if (ret < 0) {
d6f42150 3960 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3961 perror("chmod");
3962 goto end;
3963 }
3964
3965 /* Create the application unix socket */
d6f42150
DG		 3966 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3967 if (apps_sock < 0) {
3968 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3969 ret = -1;
3970 goto end;
3971 }
3972
d6f42150 3973 /* File permission MUST be 666 */
54d01ffb
DG		 3974 ret = chmod(apps_unix_sock_path,
3975 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3976 if (ret < 0) {
d6f42150 3977 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3978 perror("chmod");
3979 goto end;
3980 }
3981
3982end:
3983 umask(old_umask);
3984 return ret;
3985}
3986
3987/*
54d01ffb
DG		 3988 * Check if the global socket is available, and if a daemon is answering at the
3989 * other side. If yes, error is returned.
fac6795d 3990 */
cf3af59e 3991static int check_existing_daemon(void)
fac6795d 3992{
7d8234d9 3993 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3994 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3995 return 0;
099e26bd 3996 }
54d01ffb 3997
7d8234d9 3998 /* Is there anybody out there ? */
099e26bd 3999 if (lttng_session_daemon_alive()) {
7d8234d9 4000 return -EEXIST;
099e26bd 4001 } else {
7d8234d9 4002 return 0;
099e26bd 4003 }
fac6795d
DG		 4004}
4005
fac6795d 4006/*
d063d709 4007 * Set the tracing group gid onto the client socket.
5e16da05 4008 *
d063d709
DG		 4009 * Race window between mkdir and chown is OK because we are going from more
4010 * permissive (root.root) to les permissive (root.tracing).
fac6795d 4011 */
be040666 4012static int set_permissions(char *rundir)
fac6795d
DG		 4013{
4014 int ret;
996b65c8 4015 gid_t gid;
fac6795d 4016
996b65c8
MD		 4017 gid = allowed_group();
4018 if (gid < 0) {
be040666
DG		 4019 WARN("No tracing group detected");
4020 ret = 0;
fac6795d
DG		 4021 goto end;
4022 }
4023
d6f42150 4024 /* Set lttng run dir */
be040666 4025 ret = chown(rundir, 0, gid);
d6f42150 4026 if (ret < 0) {
be040666 4027 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 4028 perror("chown");
4029 }
4030
4031 /* lttng client socket path */
996b65c8 4032 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 4033 if (ret < 0) {
d6f42150
DG		 4034 ERR("Unable to set group on %s", client_unix_sock_path);
4035 perror("chown");
4036 }
4037
3bd1e081
MD		 4038 /* kconsumer error socket path */
4039 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 4040 if (ret < 0) {
3bd1e081
MD		 4041 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4042 perror("chown");
4043 }
4044
7753dea8
MD		 4045 /* 64-bit ustconsumer error socket path */
4046 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4047 if (ret < 0) {
4048 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4049 perror("chown");
4050 }
4051
4052 /* 32-bit ustconsumer compat32 error socket path */
4053 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 4054 if (ret < 0) {
7753dea8 4055 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 4056 perror("chown");
4057 }
4058
d6f42150 4059 DBG("All permissions are set");
e07ae692 4060
fac6795d
DG		 4061end:
4062 return ret;
4063}
4064
7a485870 4065/*
d063d709 4066 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 4067 */
4068static int create_kernel_poll_pipe(void)
4069{
4070 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4071}
4072
099e26bd
DG		 4073/*
4074 * Create the application command pipe to wake thread_manage_apps.
4075 */
4076static int create_apps_cmd_pipe(void)
4077{
4078 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4079}
4080
d6f42150 4081/*
d063d709 4082 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4083 */
67e40797 4084static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 4085{
4086 int ret;
4087
67e40797
DG		 4088 DBG3("Creating LTTng run directory: %s", rundir);
4089
4090 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
d6f42150 4091 if (ret < 0) {
b1f11e69 4092 if (errno != EEXIST) {
67e40797 4093 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4094 goto error;
4095 } else {
4096 ret = 0;
4097 }
d6f42150
DG		 4098 }
4099
4100error:
4101 return ret;
4102}
4103
4104/*
d063d709
DG		 4105 * Setup sockets and directory needed by the kconsumerd communication with the
4106 * session daemon.
d6f42150 4107 */
67e40797
DG		 4108static int set_consumer_sockets(struct consumer_data *consumer_data,
4109 const char *rundir)
d6f42150
DG		 4110{
4111 int ret;
67e40797 4112 char path[PATH_MAX];
d6f42150 4113
67e40797 4114 switch (consumer_data->type) {
7753dea8 4115 case LTTNG_CONSUMER_KERNEL:
67e40797 4116 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
7753dea8
MD		 4117 break;
4118 case LTTNG_CONSUMER64_UST:
67e40797 4119 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4120 break;
4121 case LTTNG_CONSUMER32_UST:
67e40797 4122 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4123 break;
4124 default:
4125 ERR("Consumer type unknown");
4126 ret = -EINVAL;
4127 goto error;
d6f42150
DG		 4128 }
4129
67e40797
DG		 4130 DBG2("Creating consumer directory: %s", path);
4131
3bd1e081 4132 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4133 if (ret < 0) {
6beb2242 4134 if (errno != EEXIST) {
3bd1e081 4135 ERR("Failed to create %s", path);
6beb2242
DG		 4136 goto error;
4137 }
4138 ret = 0;
d6f42150
DG		 4139 }
4140
4141 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4142 consumer_data->err_sock =
4143 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4144 if (consumer_data->err_sock < 0) {
4145 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4146 ret = -1;
4147 goto error;
4148 }
4149
4150 /* File permission MUST be 660 */
3bd1e081 4151 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4152 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4153 if (ret < 0) {
3bd1e081 4154 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4155 PERROR("chmod");
d6f42150
DG		 4156 goto error;
4157 }
4158
4159error:
4160 return ret;
4161}
4162
fac6795d 4163/*
d063d709 4164 * Signal handler for the daemon
cf3af59e 4165 *
54d01ffb
DG		 4166 * Simply stop all worker threads, leaving main() return gracefully after
4167 * joining all threads and calling cleanup().
fac6795d
DG		 4168 */
4169static void sighandler(int sig)
4170{
4171 switch (sig) {
cf3af59e
MD		 4172 case SIGPIPE:
4173 DBG("SIGPIPE catched");
4174 return;
4175 case SIGINT:
4176 DBG("SIGINT catched");
4177 stop_threads();
4178 break;
4179 case SIGTERM:
4180 DBG("SIGTERM catched");
4181 stop_threads();
4182 break;
4183 default:
4184 break;
fac6795d 4185 }
fac6795d
DG		 4186}
4187
4188/*
d063d709 4189 * Setup signal handler for :
1d4b027a 4190 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4191 */
1d4b027a 4192static int set_signal_handler(void)
fac6795d 4193{
1d4b027a
DG		 4194 int ret = 0;
4195 struct sigaction sa;
4196 sigset_t sigset;
fac6795d 4197
1d4b027a
DG		 4198 if ((ret = sigemptyset(&sigset)) < 0) {
4199 perror("sigemptyset");
4200 return ret;
4201 }
d6f42150 4202
1d4b027a
DG		 4203 sa.sa_handler = sighandler;
4204 sa.sa_mask = sigset;
4205 sa.sa_flags = 0;
4206 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4207 perror("sigaction");
4208 return ret;
d6f42150
DG		 4209 }
4210
1d4b027a
DG		 4211 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4212 perror("sigaction");
4213 return ret;
d6f42150 4214 }
aaf26714 4215
1d4b027a
DG		 4216 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4217 perror("sigaction");
4218 return ret;
8c0faa1d
DG		 4219 }
4220
1d4b027a
DG		 4221 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4222
4223 return ret;
fac6795d
DG		 4224}
4225
f3ed775e 4226/*
d063d709
DG		 4227 * Set open files limit to unlimited. This daemon can open a large number of
4228 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4229 */
4230static void set_ulimit(void)
4231{
4232 int ret;
4233 struct rlimit lim;
4234
a88df331 4235 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4236 lim.rlim_cur = 65535;
4237 lim.rlim_max = 65535;
4238
4239 ret = setrlimit(RLIMIT_NOFILE, &lim);
4240 if (ret < 0) {
4241 perror("failed to set open files limit");
4242 }
4243}
4244
fac6795d
DG		 4245/*
4246 * main
4247 */
4248int main(int argc, char **argv)
4249{
fac6795d
DG		 4250 int ret = 0;
4251 void *status;
b082db07 4252 const char *home_path;
fac6795d 4253
f6a9efaa
DG		 4254 rcu_register_thread();
4255
273ea72c 4256 /* Create thread quit pipe */
cf3af59e
MD		 4257 if ((ret = init_thread_quit_pipe()) < 0) {
4258 goto error;
273ea72c
DG		 4259 }
4260
7753dea8 4261 setup_consumerd_path();
fb09408a 4262
fac6795d
DG		 4263 /* Parse arguments */
4264 progname = argv[0];
4265 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4266 goto error;
fac6795d
DG		 4267 }
4268
4269 /* Daemonize */
4270 if (opt_daemon) {
53094c05
DG		 4271 ret = daemon(0, 0);
4272 if (ret < 0) {
4273 perror("daemon");
cf3af59e 4274 goto error;
53094c05 4275 }
fac6795d
DG		 4276 }
4277
4278 /* Check if daemon is UID = 0 */
4279 is_root = !getuid();
4280
fac6795d 4281 if (is_root) {
67e40797
DG		 4282 rundir = strdup(LTTNG_RUNDIR);
4283
4284 /* Create global run dir with root access */
4285 ret = create_lttng_rundir(rundir);
d6f42150 4286 if (ret < 0) {
cf3af59e 4287 goto error;
d6f42150
DG		 4288 }
4289
fac6795d 4290 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4291 snprintf(apps_unix_sock_path, PATH_MAX,
4292 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4293 }
4294
4295 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4296 snprintf(client_unix_sock_path, PATH_MAX,
4297 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4298 }
0fdd1e2c
DG		 4299
4300 /* Set global SHM for ust */
4301 if (strlen(wait_shm_path) == 0) {
4302 snprintf(wait_shm_path, PATH_MAX,
4303 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4304 }
67e40797
DG		 4305
4306 /* Setup kernel consumerd path */
4307 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4308 KCONSUMERD_ERR_SOCK_PATH, rundir);
4309 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4310 KCONSUMERD_CMD_SOCK_PATH, rundir);
4311
4312 DBG2("Kernel consumer err path: %s",
4313 kconsumer_data.err_unix_sock_path);
4314 DBG2("Kernel consumer cmd path: %s",
4315 kconsumer_data.cmd_unix_sock_path);
fac6795d 4316 } else {
b082db07
DG		 4317 home_path = get_home_dir();
4318 if (home_path == NULL) {
273ea72c
DG		 4319 /* TODO: Add --socket PATH option */
4320 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4321 ret = -EPERM;
4322 goto error;
b082db07
DG		 4323 }
4324
67e40797
DG		 4325 /*
4326 * Create rundir from home path. This will create something like
4327 * $HOME/.lttng
4328 */
4329 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4330 if (ret < 0) {
4331 ret = -ENOMEM;
4332 goto error;
4333 }
4334
4335 ret = create_lttng_rundir(rundir);
4336 if (ret < 0) {
4337 goto error;
4338 }
4339
fac6795d 4340 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4341 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4342 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4343 }
4344
4345 /* Set the cli tool unix socket path */
4346 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4347 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4348 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4349 }
0fdd1e2c
DG		 4350
4351 /* Set global SHM for ust */
4352 if (strlen(wait_shm_path) == 0) {
4353 snprintf(wait_shm_path, PATH_MAX,
4354 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4355 }
fac6795d
DG		 4356 }
4357
847177cd
DG		 4358 DBG("Client socket path %s", client_unix_sock_path);
4359 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4360 DBG("LTTng run directory path: %s", rundir);
4361
4362 /* 32 bits consumerd path setup */
4363 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4364 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4365 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4366 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4367
4368 DBG2("UST consumer 32 bits err path: %s",
4369 ustconsumer32_data.err_unix_sock_path);
4370 DBG2("UST consumer 32 bits cmd path: %s",
4371 ustconsumer32_data.cmd_unix_sock_path);
4372
4373 /* 64 bits consumerd path setup */
4374 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4375 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4376 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4377 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4378
4379 DBG2("UST consumer 64 bits err path: %s",
4380 ustconsumer64_data.err_unix_sock_path);
4381 DBG2("UST consumer 64 bits cmd path: %s",
4382 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4383
273ea72c 4384 /*
7d8234d9 4385 * See if daemon already exist.
fac6795d 4386 */
7d8234d9 4387 if ((ret = check_existing_daemon()) < 0) {
75462a81 4388 ERR("Already running daemon.\n");
273ea72c 4389 /*
cf3af59e
MD		 4390 * We do not goto exit because we must not cleanup()
4391 * because a daemon is already running.
ab118b20 4392 */
cf3af59e 4393 goto error;
a88df331
DG		 4394 }
4395
54d01ffb 4396 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4397
4398 /*
4399 * These actions must be executed as root. We do that *after* setting up
4400 * the sockets path because we MUST make the check for another daemon using
4401 * those paths *before* trying to set the kernel consumer sockets and init
4402 * kernel tracer.
4403 */
4404 if (is_root) {
67e40797 4405 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4406 if (ret < 0) {
4407 goto exit;
4408 }
4409
a88df331 4410 /* Setup kernel tracer */
4fba7219
DG		 4411 if (!opt_no_kernel) {
4412 init_kernel_tracer();
4413 }
a88df331
DG		 4414
4415 /* Set ulimit for open files */
4416 set_ulimit();
fac6795d
DG		 4417 }
4418
67e40797
DG		 4419 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4420 if (ret < 0) {
4421 goto exit;
4422 }
4423
4424 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4425 if (ret < 0) {
4426 goto exit;
4427 }
4428
cf3af59e
MD		 4429 if ((ret = set_signal_handler()) < 0) {
4430 goto exit;
fac6795d
DG		 4431 }
4432
d6f42150 4433 /* Setup the needed unix socket */
cf3af59e
MD		 4434 if ((ret = init_daemon_socket()) < 0) {
4435 goto exit;
fac6795d
DG		 4436 }
4437
4438 /* Set credentials to socket */
be040666 4439 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4440 goto exit;
fac6795d
DG		 4441 }
4442
5b8719f5
DG		 4443 /* Get parent pid if -S, --sig-parent is specified. */
4444 if (opt_sig_parent) {
4445 ppid = getppid();
4446 }
4447
7a485870 4448 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4449 if ((ret = create_kernel_poll_pipe()) < 0) {
4450 goto exit;
7a485870
DG		 4451 }
4452
099e26bd
DG		 4453 /* Setup the thread apps communication pipe. */
4454 if ((ret = create_apps_cmd_pipe()) < 0) {
4455 goto exit;
4456 }
4457
4458 /* Init UST command queue. */
4459 cds_wfq_init(&ust_cmd_queue.queue);
4460
f6a9efaa
DG		 4461 /* Init UST app hash table */
4462 ust_app_ht_alloc();
4463
273ea72c 4464 /*
54d01ffb
DG		 4465 * Get session list pointer. This pointer MUST NOT be free(). This list is
4466 * statically declared in session.c
273ea72c 4467 */
54d01ffb 4468 session_list_ptr = session_get_list();
b5541356 4469
5eb91c98
DG		 4470 /* Set up max poll set size */
4471 lttng_poll_set_max_size();
4472
cf3af59e 4473 /* Create thread to manage the client socket */
099e26bd
DG		 4474 ret = pthread_create(&client_thread, NULL,
4475 thread_manage_clients, (void *) NULL);
cf3af59e 4476 if (ret != 0) {
099e26bd 4477 perror("pthread_create clients");
cf3af59e
MD		 4478 goto exit_client;
4479 }
fac6795d 4480
099e26bd
DG		 4481 /* Create thread to dispatch registration */
4482 ret = pthread_create(&dispatch_thread, NULL,
4483 thread_dispatch_ust_registration, (void *) NULL);
4484 if (ret != 0) {
4485 perror("pthread_create dispatch");
4486 goto exit_dispatch;
4487 }
4488
4489 /* Create thread to manage application registration. */
4490 ret = pthread_create(&reg_apps_thread, NULL,
4491 thread_registration_apps, (void *) NULL);
4492 if (ret != 0) {
4493 perror("pthread_create registration");
4494 goto exit_reg_apps;
4495 }
4496
cf3af59e 4497 /* Create thread to manage application socket */
54d01ffb
DG		 4498 ret = pthread_create(&apps_thread, NULL,
4499 thread_manage_apps, (void *) NULL);
cf3af59e 4500 if (ret != 0) {
099e26bd 4501 perror("pthread_create apps");
cf3af59e
MD		 4502 goto exit_apps;
4503 }
fac6795d 4504
cf3af59e 4505 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4506 ret = pthread_create(&kernel_thread, NULL,
4507 thread_manage_kernel, (void *) NULL);
cf3af59e 4508 if (ret != 0) {
099e26bd 4509 perror("pthread_create kernel");
cf3af59e
MD		 4510 goto exit_kernel;
4511 }
7a485870 4512
cf3af59e
MD		 4513 ret = pthread_join(kernel_thread, &status);
4514 if (ret != 0) {
4515 perror("pthread_join");
4516 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4517 }
4518
cf3af59e
MD		 4519exit_kernel:
4520 ret = pthread_join(apps_thread, &status);
4521 if (ret != 0) {
4522 perror("pthread_join");
4523 goto error; /* join error, exit without cleanup */
4524 }
fac6795d 4525
cf3af59e 4526exit_apps:
099e26bd
DG		 4527 ret = pthread_join(reg_apps_thread, &status);
4528 if (ret != 0) {
4529 perror("pthread_join");
4530 goto error; /* join error, exit without cleanup */
4531 }
4532
4533exit_reg_apps:
4534 ret = pthread_join(dispatch_thread, &status);
4535 if (ret != 0) {
4536 perror("pthread_join");
4537 goto error; /* join error, exit without cleanup */
4538 }
4539
4540exit_dispatch:
cf3af59e
MD		 4541 ret = pthread_join(client_thread, &status);
4542 if (ret != 0) {
4543 perror("pthread_join");
4544 goto error; /* join error, exit without cleanup */
4545 }
4546
3bd1e081 4547 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4548 if (ret != 0) {
3bd1e081 4549 perror("join_consumer");
cf3af59e
MD		 4550 goto error; /* join error, exit without cleanup */
4551 }
a88df331 4552
cf3af59e 4553exit_client:
a88df331 4554exit:
cf3af59e
MD		 4555 /*
4556 * cleanup() is called when no other thread is running.
4557 */
f6a9efaa 4558 rcu_thread_online();
cf3af59e 4559 cleanup();
f6a9efaa
DG		 4560 rcu_thread_offline();
4561 rcu_unregister_thread();
67e40797 4562 if (!ret) {
cf3af59e 4563 exit(EXIT_SUCCESS);
67e40797 4564 }
cf3af59e 4565error:
5e16da05 4566 exit(EXIT_FAILURE);
fac6795d 4567}
LTTng 2.0 tools and control repository
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