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librarize run_as
[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>
e88129fc 42#include <lttng-sessiond-comm.h>
3bd1e081 43#include <lttng/lttng-consumer.h>
2bdd86d4 44
1e307fab 45#include <lttngerr.h>
60b6c79c 46#include <runas.h>
fac6795d 47
54d01ffb 48#include "channel.h"
5eb91c98 49#include "compat/poll.h"
099e26bd 50#include "context.h"
54d01ffb 51#include "event.h"
099e26bd 52#include "futex.h"
f6a9efaa 53#include "hashtable.h"
4771f025 54#include "kernel.h"
32258573 55#include "lttng-sessiond.h"
0fdd1e2c 56#include "shm.h"
56fff090 57#include "ust-app.h"
1e307fab 58#include "ust-ctl.h"
8e68d1c8 59#include "utils.h"
fac6795d 60
ebaeda94
MD		 61#define CONSUMERD_FILE "lttng-consumerd"
62
3bd1e081
MD		 63struct consumer_data {
64 enum lttng_consumer_type type;
65
66 pthread_t thread; /* Worker thread interacting with the consumer */
67 sem_t sem;
68
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex;
71 pid_t pid;
72
73 int err_sock;
74 int cmd_sock;
75
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path[PATH_MAX];
78 char cmd_unix_sock_path[PATH_MAX];
79};
80
75462a81 81/* Const values */
686204ab 82const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 83const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD		 84const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
85const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
86
fac6795d 87/* Variables */
1d4b027a 88int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 89int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 90int opt_quiet; /* Not static for lttngerr.h */
d063d709 91
fac6795d
DG		 92const char *progname;
93const char *opt_tracing_group;
5b8719f5 94static int opt_sig_parent;
fac6795d 95static int opt_daemon;
4fba7219 96static int opt_no_kernel;
fac6795d 97static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 98static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 99static char *rundir;
3bd1e081
MD		 100
101/* Consumer daemon specific control data */
102static struct consumer_data kconsumer_data = {
103 .type = LTTNG_CONSUMER_KERNEL,
7753dea8
MD		 104 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
105 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 106};
7753dea8
MD		 107static struct consumer_data ustconsumer64_data = {
108 .type = LTTNG_CONSUMER64_UST,
109 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
110 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
111};
112static struct consumer_data ustconsumer32_data = {
113 .type = LTTNG_CONSUMER32_UST,
114 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
115 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 116};
117
099e26bd 118static int dispatch_thread_exit;
fac6795d 119
54d01ffb
DG		 120/* Global application Unix socket path */
121static char apps_unix_sock_path[PATH_MAX];
122/* Global client Unix socket path */
123static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 124/* global wait shm path for UST */
125static char wait_shm_path[PATH_MAX];
fac6795d 126
1d4b027a 127/* Sockets and FDs */
d6f42150
DG		 128static int client_sock;
129static int apps_sock;
20fe2104 130static int kernel_tracer_fd;
7a485870 131static int kernel_poll_pipe[2];
1d4b027a 132
273ea72c
DG		 133/*
134 * Quit pipe for all threads. This permits a single cancellation point
135 * for all threads when receiving an event on the pipe.
136 */
137static int thread_quit_pipe[2];
138
099e26bd
DG		 139/*
140 * This pipe is used to inform the thread managing application communication
141 * that a command is queued and ready to be processed.
142 */
143static int apps_cmd_pipe[2];
144
1d4b027a 145/* Pthread, Mutexes and Semaphores */
1d4b027a 146static pthread_t apps_thread;
099e26bd 147static pthread_t reg_apps_thread;
1d4b027a 148static pthread_t client_thread;
7a485870 149static pthread_t kernel_thread;
099e26bd 150static pthread_t dispatch_thread;
5eb91c98 151
fac6795d 152
099e26bd
DG		 153/*
154 * UST registration command queue. This queue is tied with a futex and uses a N
155 * wakers / 1 waiter implemented and detailed in futex.c/.h
156 *
157 * The thread_manage_apps and thread_dispatch_ust_registration interact with
158 * this queue and the wait/wake scheme.
159 */
160static struct ust_cmd_queue ust_cmd_queue;
161
b5541356
DG		 162/*
163 * Pointer initialized before thread creation.
164 *
165 * This points to the tracing session list containing the session count and a
166 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
167 * MUST NOT be taken if you call a public function in session.c.
04ea676f 168 *
d063d709 169 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 170 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 171 */
172static struct ltt_session_list *session_list_ptr;
173
7753dea8
MD		 174int ust_consumerd64_fd = -1;
175int ust_consumerd32_fd = -1;
176
fc7a59ce
AM		 177static const char *consumerd32_bin =
178 __stringify(CONFIG_CONSUMERD32_BIN);
179static const char *consumerd64_bin =
180 __stringify(CONFIG_CONSUMERD64_BIN);
ebaeda94
MD		 181static const char *consumerd32_libdir =
182 __stringify(CONFIG_CONSUMERD32_LIBDIR);
183static const char *consumerd64_libdir =
184 __stringify(CONFIG_CONSUMERD64_LIBDIR);
fb09408a
MD		 185
186static
7753dea8 187void setup_consumerd_path(void)
fb09408a 188{
fc7a59ce 189 const char *bin, *libdir;
fb09408a 190
7753dea8
MD		 191 /*
192 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 193 * native architecture size consumer if CONFIG_CONSUMER*_PATH
194 * has not been defined.
7753dea8 195 */
ebaeda94 196#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 197 if (!consumerd32_bin[0]) {
198 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 199 }
200 if (!consumerd32_libdir[0]) {
201 consumerd32_libdir = INSTALL_LIB_PATH;
202 }
203#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 204 if (!consumerd64_bin[0]) {
205 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 206 }
ebaeda94
MD		 207 if (!consumerd64_libdir[0]) {
208 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 209 }
210#else
211#error "Unknown bitness"
212#endif
213
fb09408a
MD		 214 /*
215 * runtime env. var. overrides the build default.
216 */
fc7a59ce
AM		 217 bin = getenv("LTTNG_CONSUMERD32_BIN");
218 if (bin) {
219 consumerd32_bin = bin;
7753dea8 220 }
fc7a59ce
AM		 221 bin = getenv("LTTNG_CONSUMERD64_BIN");
222 if (bin) {
223 consumerd64_bin = bin;
ebaeda94
MD		 224 }
225 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
226 if (libdir) {
227 consumerd32_libdir = libdir;
228 }
229 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
230 if (libdir) {
231 consumerd64_libdir = libdir;
fb09408a
MD		 232 }
233}
234
5eb91c98
DG		 235/*
236 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
237 */
238static int create_thread_poll_set(struct lttng_poll_event *events,
239 unsigned int size)
240{
241 int ret;
242
243 if (events == NULL || size == 0) {
244 ret = -1;
245 goto error;
246 }
247
248 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
249 if (ret < 0) {
250 goto error;
251 }
252
253 /* Add quit pipe */
254 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
255 if (ret < 0) {
256 goto error;
257 }
258
259 return 0;
260
261error:
262 return ret;
263}
264
265/*
266 * Check if the thread quit pipe was triggered.
267 *
268 * Return 1 if it was triggered else 0;
269 */
270static int check_thread_quit_pipe(int fd, uint32_t events)
271{
272 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
273 return 1;
274 }
275
276 return 0;
277}
278
0fdd1e2c
DG		 279/*
280 * Remove modules in reverse load order.
281 */
282static int modprobe_remove_kernel_modules(void)
283{
284 int ret = 0, i;
285 char modprobe[256];
286
287 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
288 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 289 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG		 290 kernel_modules_list[i].name);
291 if (ret < 0) {
24b487b8 292 perror("snprintf modprobe -r");
0fdd1e2c
DG		 293 goto error;
294 }
295 modprobe[sizeof(modprobe) - 1] = '\0';
296 ret = system(modprobe);
297 if (ret == -1) {
24b487b8 298 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG		 299 kernel_modules_list[i].name);
300 } else if (kernel_modules_list[i].required
301 && WEXITSTATUS(ret) != 0) {
302 ERR("Unable to remove module %s",
303 kernel_modules_list[i].name);
304 } else {
305 DBG("Modprobe removal successful %s",
306 kernel_modules_list[i].name);
307 }
308 }
309
310error:
311 return ret;
312}
313
314/*
315 * Return group ID of the tracing group or -1 if not found.
316 */
996b65c8
MD		 317static gid_t allowed_group(void)
318{
319 struct group *grp;
320
274e143b
MD		 321 if (opt_tracing_group) {
322 grp = getgrnam(opt_tracing_group);
323 } else {
324 grp = getgrnam(default_tracing_group);
325 }
996b65c8
MD		 326 if (!grp) {
327 return -1;
328 } else {
329 return grp->gr_gid;
330 }
331}
332
273ea72c 333/*
5eb91c98 334 * Init thread quit pipe.
273ea72c
DG		 335 *
336 * Return -1 on error or 0 if all pipes are created.
337 */
338static int init_thread_quit_pipe(void)
339{
340 int ret;
341
342 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
343 if (ret < 0) {
344 perror("thread quit pipe");
345 goto error;
346 }
347
348error:
349 return ret;
350}
351
fac6795d 352/*
d063d709
DG		 353 * Complete teardown of a kernel session. This free all data structure related
354 * to a kernel session and update counter.
fac6795d 355 */
1d4b027a 356static void teardown_kernel_session(struct ltt_session *session)
fac6795d 357{
8f7a84dd
DG		 358 if (!session->kernel_session) {
359 DBG3("No kernel session when tearingdown session");
84ea9c99 360 return;
8f7a84dd
DG		 361 }
362
84ea9c99 363 DBG("Tearing down kernel session");
d9800920 364
84ea9c99
MD		 365 /*
366 * If a custom kernel consumer was registered, close the socket before
367 * tearing down the complete kernel session structure
368 */
369 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
370 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 371 }
84ea9c99
MD		 372
373 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 374}
375
f6a9efaa
DG		 376/*
377 * Complete teardown of all UST sessions. This will free everything on his path
378 * and destroy the core essence of all ust sessions :)
379 */
380static void teardown_ust_session(struct ltt_session *session)
381{
84cd17c6
MD		 382 int ret;
383
8f7a84dd
DG		 384 if (!session->ust_session) {
385 DBG3("No UST session when tearingdown session");
f470a390 386 return;
8f7a84dd
DG		 387 }
388
84ea9c99 389 DBG("Tearing down UST session(s)");
8f7a84dd 390
84cd17c6
MD		 391 ret = ust_app_destroy_trace_all(session->ust_session);
392 if (ret) {
393 ERR("Error in ust_app_destroy_trace_all");
394 }
8f7a84dd 395
f6a9efaa
DG		 396 trace_ust_destroy_session(session->ust_session);
397}
398
099e26bd
DG		 399/*
400 * Stop all threads by closing the thread quit pipe.
401 */
cf3af59e
MD		 402static void stop_threads(void)
403{
5eb91c98
DG		 404 int ret;
405
cf3af59e
MD		 406 /* Stopping all threads */
407 DBG("Terminating all threads");
54d01ffb 408 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 409 if (ret < 0) {
410 ERR("write error on thread quit pipe");
411 }
412
099e26bd
DG		 413 /* Dispatch thread */
414 dispatch_thread_exit = 1;
415 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 416}
417
fac6795d 418/*
d063d709 419 * Cleanup the daemon
fac6795d 420 */
cf3af59e 421static void cleanup(void)
fac6795d 422{
1d4b027a
DG		 423 int ret;
424 char *cmd;
af9737e9 425 struct ltt_session *sess, *stmp;
fac6795d 426
1d4b027a 427 DBG("Cleaning up");
e07ae692 428
67e40797
DG		 429 DBG("Removing %s directory", rundir);
430 ret = asprintf(&cmd, "rm -rf %s", rundir);
431 if (ret < 0) {
432 ERR("asprintf failed. Something is really wrong!");
433 }
5461b305 434
67e40797
DG		 435 /* Remove lttng run directory */
436 ret = system(cmd);
437 if (ret < 0) {
438 ERR("Unable to clean %s", rundir);
1d4b027a 439 }
67e40797 440 free(cmd);
5461b305 441
1d4b027a 442 DBG("Cleaning up all session");
fac6795d 443
b5541356 444 /* Destroy session list mutex */
273ea72c
DG		 445 if (session_list_ptr != NULL) {
446 pthread_mutex_destroy(&session_list_ptr->lock);
447
448 /* Cleanup ALL session */
54d01ffb
DG		 449 cds_list_for_each_entry_safe(sess, stmp,
450 &session_list_ptr->head, list) {
273ea72c 451 teardown_kernel_session(sess);
f6a9efaa
DG		 452 teardown_ust_session(sess);
453 free(sess);
273ea72c
DG		 454 }
455 }
456
099e26bd 457 DBG("Closing all UST sockets");
56fff090 458 ust_app_clean_list();
099e26bd 459
3bd1e081 460 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 461
4fba7219
DG		 462 if (is_root && !opt_no_kernel) {
463 DBG2("Closing kernel fd");
464 close(kernel_tracer_fd);
2f50c8a3
DG		 465 DBG("Unloading kernel modules");
466 modprobe_remove_kernel_modules();
467 }
5eb91c98
DG		 468
469 close(thread_quit_pipe[0]);
470 close(thread_quit_pipe[1]);
421cb601
DG		 471
472 /* <fun> */
f56a39af 473 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG		 474 "Matthew, BEET driven development works!%c[%dm",
475 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
476 /* </fun> */
fac6795d
DG		 477}
478
e065084a 479/*
d063d709 480 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 481 *
d063d709 482 * Return lttcomm error code.
e065084a
DG		 483 */
484static int send_unix_sock(int sock, void *buf, size_t len)
485{
486 /* Check valid length */
487 if (len <= 0) {
488 return -1;
489 }
490
491 return lttcomm_send_unix_sock(sock, buf, len);
492}
493
5461b305 494/*
d063d709 495 * Free memory of a command context structure.
5461b305 496 */
a2fb29a5 497static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 498{
a2fb29a5
DG		 499 DBG("Clean command context structure");
500 if (*cmd_ctx) {
501 if ((*cmd_ctx)->llm) {
502 free((*cmd_ctx)->llm);
5461b305 503 }
a2fb29a5
DG		 504 if ((*cmd_ctx)->lsm) {
505 free((*cmd_ctx)->lsm);
5461b305 506 }
a2fb29a5
DG		 507 free(*cmd_ctx);
508 *cmd_ctx = NULL;
5461b305
DG		 509 }
510}
511
f3ed775e 512/*
d063d709 513 * Send all stream fds of kernel channel to the consumer.
f3ed775e 514 */
2bdd86d4 515static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD		 516 int sock, struct ltt_kernel_channel *channel,
517 uid_t uid, gid_t gid)
f3ed775e
DG		 518{
519 int ret;
f3ed775e 520 struct ltt_kernel_stream *stream;
3bd1e081 521 struct lttcomm_consumer_msg lkm;
f3ed775e 522
3bd1e081 523 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 524 channel->channel->name);
f3ed775e 525
3bd1e081
MD		 526 /* Send channel */
527 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
528 lkm.u.channel.channel_key = channel->fd;
529 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
530 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 531 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 532 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 533 if (ret < 0) {
3bd1e081 534 perror("send consumer channel");
f3ed775e
DG		 535 goto error;
536 }
537
3bd1e081 538 /* Send streams */
7a485870 539 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 540 if (!stream->fd) {
541 continue;
542 }
543 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
544 lkm.u.stream.channel_key = channel->fd;
545 lkm.u.stream.stream_key = stream->fd;
546 lkm.u.stream.state = stream->state;
547 lkm.u.stream.output = channel->channel->attr.output;
548 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 549 lkm.u.stream.uid = uid;
550 lkm.u.stream.gid = gid;
3bd1e081
MD		 551 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
552 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
553 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
554 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
555 if (ret < 0) {
556 perror("send consumer stream");
557 goto error;
558 }
559 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
560 if (ret < 0) {
561 perror("send consumer stream ancillary data");
562 goto error;
f3ed775e
DG		 563 }
564 }
565
3bd1e081 566 DBG("consumer channel streams sent");
f3ed775e
DG		 567
568 return 0;
569
570error:
571 return ret;
572}
573
574/*
d063d709 575 * Send all stream fds of the kernel session to the consumer.
f3ed775e 576 */
2bdd86d4 577static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 578 struct ltt_kernel_session *session)
f3ed775e
DG		 579{
580 int ret;
581 struct ltt_kernel_channel *chan;
3bd1e081
MD		 582 struct lttcomm_consumer_msg lkm;
583 int sock = session->consumer_fd;
7a485870
DG		 584
585 DBG("Sending metadata stream fd");
586
2bdd86d4 587 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 588 if (session->consumer_fd == 0) {
3bd1e081 589 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 590 }
591
7a485870 592 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 593 /* Send metadata channel fd */
594 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
595 lkm.u.channel.channel_key = session->metadata->fd;
596 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
597 lkm.u.channel.mmap_len = 0; /* for kernel */
598 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
599 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
600 if (ret < 0) {
601 perror("send consumer channel");
602 goto error;
603 }
604
605 /* Send metadata stream fd */
606 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
607 lkm.u.stream.channel_key = session->metadata->fd;
608 lkm.u.stream.stream_key = session->metadata_stream_fd;
609 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
610 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
611 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 612 lkm.u.stream.uid = session->uid;
613 lkm.u.stream.gid = session->gid;
3bd1e081
MD		 614 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
615 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
616 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
617 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
618 if (ret < 0) {
619 perror("send consumer stream");
620 goto error;
621 }
622 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 623 if (ret < 0) {
3bd1e081 624 perror("send consumer stream");
7a485870
DG		 625 goto error;
626 }
627 }
f3ed775e 628
f3ed775e 629 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD		 630 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
631 session->uid, session->gid);
2bdd86d4
MD		 632 if (ret < 0) {
633 goto error;
634 }
635 }
636
637 DBG("consumer fds (metadata and channel streams) sent");
638
639 return 0;
640
641error:
642 return ret;
643}
644
fac6795d 645/*
0fdd1e2c 646 * Notify UST applications using the shm mmap futex.
fac6795d 647 */
0fdd1e2c 648static int notify_ust_apps(int active)
fac6795d 649{
0fdd1e2c 650 char *wait_shm_mmap;
fac6795d 651
0fdd1e2c 652 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 653
0fdd1e2c
DG		 654 /* See shm.c for this call implying mmap, shm and futex calls */
655 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
656 if (wait_shm_mmap == NULL) {
fac6795d
DG		 657 goto error;
658 }
659
0fdd1e2c
DG		 660 /* Wake waiting process */
661 futex_wait_update((int32_t *) wait_shm_mmap, active);
662
663 /* Apps notified successfully */
664 return 0;
fac6795d
DG		 665
666error:
0fdd1e2c 667 return -1;
fac6795d
DG		 668}
669
e065084a 670/*
d063d709
DG		 671 * Setup the outgoing data buffer for the response (llm) by allocating the
672 * right amount of memory and copying the original information from the lsm
673 * structure.
ca95a216 674 *
d063d709 675 * Return total size of the buffer pointed by buf.
ca95a216 676 */
5461b305 677static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 678{
f3ed775e 679 int ret, buf_size;
ca95a216 680
f3ed775e 681 buf_size = size;
5461b305 682
ba7f0ae5 683 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 684 if (cmd_ctx->llm == NULL) {
ba7f0ae5 685 perror("zmalloc");
5461b305 686 ret = -ENOMEM;
ca95a216
DG		 687 goto error;
688 }
689
5461b305
DG		 690 /* Copy common data */
691 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 692 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 693
5461b305
DG		 694 cmd_ctx->llm->data_size = size;
695 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
696
ca95a216
DG		 697 return buf_size;
698
699error:
700 return ret;
701}
702
7a485870 703/*
5eb91c98 704 * Update the kernel poll set of all channel fd available over all tracing
d063d709 705 * session. Add the wakeup pipe at the end of the set.
7a485870 706 */
5eb91c98 707static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 708{
5eb91c98 709 int ret;
7a485870
DG		 710 struct ltt_session *session;
711 struct ltt_kernel_channel *channel;
712
5eb91c98 713 DBG("Updating kernel poll set");
7a485870 714
54d01ffb 715 session_lock_list();
b5541356 716 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 717 session_lock(session);
7a485870 718 if (session->kernel_session == NULL) {
54d01ffb 719 session_unlock(session);
7a485870
DG		 720 continue;
721 }
7a485870 722
54d01ffb
DG		 723 cds_list_for_each_entry(channel,
724 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 725 /* Add channel fd to the kernel poll set */
726 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
727 if (ret < 0) {
54d01ffb 728 session_unlock(session);
5eb91c98
DG		 729 goto error;
730 }
731 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 732 }
54d01ffb 733 session_unlock(session);
7a485870 734 }
54d01ffb 735 session_unlock_list();
7a485870 736
5eb91c98 737 return 0;
7a485870
DG		 738
739error:
54d01ffb 740 session_unlock_list();
7a485870
DG		 741 return -1;
742}
743
744/*
54d01ffb 745 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 746 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 747 *
d063d709 748 * Useful for CPU hotplug feature.
7a485870 749 */
2bdd86d4 750static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 751{
752 int ret = 0;
753 struct ltt_session *session;
754 struct ltt_kernel_channel *channel;
755
756 DBG("Updating kernel streams for channel fd %d", fd);
757
54d01ffb 758 session_lock_list();
b5541356 759 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 760 session_lock(session);
7a485870 761 if (session->kernel_session == NULL) {
54d01ffb 762 session_unlock(session);
7a485870
DG		 763 continue;
764 }
d9800920
DG		 765
766 /* This is not suppose to be 0 but this is an extra security check */
767 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 768 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 769 }
770
5eb91c98
DG		 771 cds_list_for_each_entry(channel,
772 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 773 if (channel->fd == fd) {
774 DBG("Channel found, updating kernel streams");
775 ret = kernel_open_channel_stream(channel);
776 if (ret < 0) {
b3c750d2 777 goto error;
7a485870 778 }
d9800920 779
7a485870 780 /*
5eb91c98
DG		 781 * Have we already sent fds to the consumer? If yes, it means
782 * that tracing is started so it is safe to send our updated
783 * stream fds.
7a485870 784 */
3bd1e081 785 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 786 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD		 787 session->kernel_session->consumer_fd, channel,
788 session->uid, session->gid);
7a485870 789 if (ret < 0) {
b3c750d2 790 goto error;
7a485870
DG		 791 }
792 }
b3c750d2 793 goto error;
7a485870
DG		 794 }
795 }
54d01ffb 796 session_unlock(session);
7a485870 797 }
54d01ffb 798 session_unlock_list();
b3c750d2 799 return ret;
7a485870 800
b3c750d2 801error:
54d01ffb
DG		 802 session_unlock(session);
803 session_unlock_list();
7a485870
DG		 804 return ret;
805}
806
487cf67c
DG		 807/*
808 * For each tracing session, update newly registered apps.
809 */
810static void update_ust_app(int app_sock)
811{
812 struct ltt_session *sess, *stmp;
813
814 /* For all tracing session(s) */
815 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG		 816 if (sess->ust_session) {
817 ust_app_global_update(sess->ust_session, app_sock);
818 }
487cf67c
DG		 819 }
820}
821
7a485870 822/*
d063d709 823 * This thread manage event coming from the kernel.
7a485870 824 *
d063d709
DG		 825 * Features supported in this thread:
826 * -) CPU Hotplug
7a485870
DG		 827 */
828static void *thread_manage_kernel(void *data)
829{
5eb91c98
DG		 830 int ret, i, pollfd, update_poll_flag = 1;
831 uint32_t revents, nb_fd;
7a485870 832 char tmp;
5eb91c98 833 struct lttng_poll_event events;
7a485870
DG		 834
835 DBG("Thread manage kernel started");
836
5eb91c98
DG		 837 ret = create_thread_poll_set(&events, 2);
838 if (ret < 0) {
839 goto error;
840 }
841
842 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
843 if (ret < 0) {
844 goto error;
845 }
846
7a485870
DG		 847 while (1) {
848 if (update_poll_flag == 1) {
5f822d0a
DG		 849 /*
850 * Reset number of fd in the poll set. Always 2 since there is the thread
851 * quit pipe and the kernel pipe.
852 */
853 events.nb_fd = 2;
854
5eb91c98
DG		 855 ret = update_kernel_poll(&events);
856 if (ret < 0) {
7a485870
DG		 857 goto error;
858 }
859 update_poll_flag = 0;
860 }
861
5eb91c98
DG		 862 nb_fd = LTTNG_POLL_GETNB(&events);
863
864 DBG("Thread kernel polling on %d fds", nb_fd);
865
866 /* Zeroed the poll events */
867 lttng_poll_reset(&events);
7a485870
DG		 868
869 /* Poll infinite value of time */
5eb91c98 870 ret = lttng_poll_wait(&events, -1);
7a485870 871 if (ret < 0) {
7a485870
DG		 872 goto error;
873 } else if (ret == 0) {
874 /* Should not happen since timeout is infinite */
85611738
DG		 875 ERR("Return value of poll is 0 with an infinite timeout.\n"
876 "This should not have happened! Continuing...");
7a485870
DG		 877 continue;
878 }
879
5eb91c98
DG		 880 for (i = 0; i < nb_fd; i++) {
881 /* Fetch once the poll data */
882 revents = LTTNG_POLL_GETEV(&events, i);
883 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 884
5eb91c98
DG		 885 /* Thread quit pipe has been closed. Killing thread. */
886 ret = check_thread_quit_pipe(pollfd, revents);
887 if (ret) {
888 goto error;
889 }
7a485870 890
5eb91c98
DG		 891 /* Check for data on kernel pipe */
892 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
893 ret = read(kernel_poll_pipe[0], &tmp, 1);
894 update_poll_flag = 1;
895 continue;
896 } else {
897 /*
898 * New CPU detected by the kernel. Adding kernel stream to
899 * kernel session and updating the kernel consumer
900 */
901 if (revents & LPOLLIN) {
2bdd86d4 902 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 903 if (ret < 0) {
904 continue;
905 }
906 break;
907 /*
908 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
909 * and unregister kernel stream at this point.
910 */
7a485870 911 }
7a485870
DG		 912 }
913 }
914 }
915
916error:
917 DBG("Kernel thread dying");
273ea72c
DG		 918 close(kernel_poll_pipe[0]);
919 close(kernel_poll_pipe[1]);
5eb91c98
DG		 920
921 lttng_poll_clean(&events);
922
7a485870
DG		 923 return NULL;
924}
925
1d4b027a 926/*
3bd1e081 927 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 928 */
3bd1e081 929static void *thread_manage_consumer(void *data)
1d4b027a 930{
5eb91c98
DG		 931 int sock = 0, i, ret, pollfd;
932 uint32_t revents, nb_fd;
1d4b027a 933 enum lttcomm_return_code code;
5eb91c98 934 struct lttng_poll_event events;
3bd1e081 935 struct consumer_data *consumer_data = data;
1d4b027a 936
3bd1e081 937 DBG("[thread] Manage consumer started");
1d4b027a 938
3bd1e081 939 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 940 if (ret < 0) {
941 goto error;
942 }
943
5eb91c98
DG		 944 /*
945 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
946 * Nothing more will be added to this poll set.
947 */
948 ret = create_thread_poll_set(&events, 2);
949 if (ret < 0) {
950 goto error;
951 }
273ea72c 952
3bd1e081 953 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 954 if (ret < 0) {
955 goto error;
956 }
957
958 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 959
960 /* Inifinite blocking call, waiting for transmission */
5eb91c98 961 ret = lttng_poll_wait(&events, -1);
273ea72c 962 if (ret < 0) {
273ea72c
DG		 963 goto error;
964 }
965
5eb91c98
DG		 966 for (i = 0; i < nb_fd; i++) {
967 /* Fetch once the poll data */
968 revents = LTTNG_POLL_GETEV(&events, i);
969 pollfd = LTTNG_POLL_GETFD(&events, i);
970
971 /* Thread quit pipe has been closed. Killing thread. */
972 ret = check_thread_quit_pipe(pollfd, revents);
973 if (ret) {
974 goto error;
975 }
976
977 /* Event on the registration socket */
3bd1e081 978 if (pollfd == consumer_data->err_sock) {
5eb91c98 979 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 980 ERR("consumer err socket poll error");
5eb91c98
DG		 981 goto error;
982 }
983 }
273ea72c
DG		 984 }
985
3bd1e081 986 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 987 if (sock < 0) {
988 goto error;
989 }
990
3bd1e081 991 DBG2("Receiving code from consumer err_sock");
ee0b0061 992
712ea556 993 /* Getting status code from kconsumerd */
54d01ffb
DG		 994 ret = lttcomm_recv_unix_sock(sock, &code,
995 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 996 if (ret <= 0) {
997 goto error;
998 }
999
3bd1e081
MD		 1000 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1001 consumer_data->cmd_sock =
1002 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1003 if (consumer_data->cmd_sock < 0) {
1004 sem_post(&consumer_data->sem);
48842b30 1005 PERROR("consumer connect");
1d4b027a
DG		 1006 goto error;
1007 }
1008 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 1009 sem_post(&consumer_data->sem);
1010 DBG("consumer command socket ready");
1d4b027a 1011 } else {
3bd1e081 1012 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 1013 lttcomm_get_readable_code(-code));
1014 goto error;
1015 }
1016
54d01ffb 1017 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1018 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1019 if (ret < 0) {
72079cae
DG		 1020 goto error;
1021 }
1022
5eb91c98
DG		 1023 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1024 if (ret < 0) {
72079cae 1025 goto error;
5eb91c98
DG		 1026 }
1027
1028 /* Update number of fd */
1029 nb_fd = LTTNG_POLL_GETNB(&events);
1030
1031 /* Inifinite blocking call, waiting for transmission */
1032 ret = lttng_poll_wait(&events, -1);
1033 if (ret < 0) {
72079cae
DG		 1034 goto error;
1035 }
1036
5eb91c98
DG		 1037 for (i = 0; i < nb_fd; i++) {
1038 /* Fetch once the poll data */
1039 revents = LTTNG_POLL_GETEV(&events, i);
1040 pollfd = LTTNG_POLL_GETFD(&events, i);
1041
1042 /* Thread quit pipe has been closed. Killing thread. */
1043 ret = check_thread_quit_pipe(pollfd, revents);
1044 if (ret) {
1045 goto error;
1046 }
1047
1048 /* Event on the kconsumerd socket */
1049 if (pollfd == sock) {
1050 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1051 ERR("consumer err socket second poll error");
5eb91c98
DG		 1052 goto error;
1053 }
1054 }
1055 }
1056
712ea556 1057 /* Wait for any kconsumerd error */
54d01ffb
DG		 1058 ret = lttcomm_recv_unix_sock(sock, &code,
1059 sizeof(enum lttcomm_return_code));
712ea556 1060 if (ret <= 0) {
3bd1e081 1061 ERR("consumer closed the command socket");
712ea556 1062 goto error;
6f61d021 1063 }
1d4b027a 1064
3bd1e081 1065 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1066
1d4b027a 1067error:
3bd1e081
MD		 1068 DBG("consumer thread dying");
1069 close(consumer_data->err_sock);
1070 close(consumer_data->cmd_sock);
5eb91c98 1071 close(sock);
273ea72c 1072
3bd1e081
MD		 1073 unlink(consumer_data->err_unix_sock_path);
1074 unlink(consumer_data->cmd_unix_sock_path);
1075 consumer_data->pid = 0;
1d4b027a 1076
5eb91c98 1077 lttng_poll_clean(&events);
0177d773 1078
5eb91c98 1079 return NULL;
099e26bd
DG		 1080}
1081
099e26bd
DG		 1082/*
1083 * This thread manage application communication.
1d4b027a
DG		 1084 */
1085static void *thread_manage_apps(void *data)
099e26bd 1086{
5eb91c98
DG		 1087 int i, ret, pollfd;
1088 uint32_t revents, nb_fd;
099e26bd 1089 struct ust_command ust_cmd;
5eb91c98 1090 struct lttng_poll_event events;
099e26bd
DG		 1091
1092 DBG("[thread] Manage application started");
1093
f6a9efaa
DG		 1094 rcu_register_thread();
1095 rcu_thread_online();
1096
5eb91c98
DG		 1097 ret = create_thread_poll_set(&events, 2);
1098 if (ret < 0) {
1099 goto error;
1100 }
099e26bd 1101
5eb91c98
DG		 1102 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1103 if (ret < 0) {
1104 goto error;
1105 }
099e26bd 1106
5eb91c98
DG		 1107 while (1) {
1108 /* Zeroed the events structure */
1109 lttng_poll_reset(&events);
0177d773 1110
5eb91c98 1111 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1112
1113 DBG("Apps thread polling on %d fds", nb_fd);
1114
1115 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1116 ret = lttng_poll_wait(&events, -1);
099e26bd 1117 if (ret < 0) {
099e26bd
DG		 1118 goto error;
1119 }
1120
5eb91c98
DG		 1121 for (i = 0; i < nb_fd; i++) {
1122 /* Fetch once the poll data */
1123 revents = LTTNG_POLL_GETEV(&events, i);
1124 pollfd = LTTNG_POLL_GETFD(&events, i);
1125
1126 /* Thread quit pipe has been closed. Killing thread. */
1127 ret = check_thread_quit_pipe(pollfd, revents);
1128 if (ret) {
099e26bd 1129 goto error;
5eb91c98 1130 }
099e26bd 1131
5eb91c98
DG		 1132 /* Inspect the apps cmd pipe */
1133 if (pollfd == apps_cmd_pipe[0]) {
1134 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1135 ERR("Apps command pipe error");
0177d773 1136 goto error;
5eb91c98
DG		 1137 } else if (revents & LPOLLIN) {
1138 /* Empty pipe */
1139 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1140 if (ret < 0 || ret < sizeof(ust_cmd)) {
1141 perror("read apps cmd pipe");
1142 goto error;
1143 }
099e26bd 1144
5eb91c98 1145 /* Register applicaton to the session daemon */
56fff090 1146 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1147 ust_cmd.sock);
88ff5b7f 1148 if (ret == -ENOMEM) {
5eb91c98 1149 goto error;
88ff5b7f
MD		 1150 } else if (ret < 0) {
1151 break;
5eb91c98
DG		 1152 }
1153
acc7b41b
MD		 1154 /*
1155 * Add channel(s) and event(s) to newly registered apps
1156 * from lttng global UST domain.
1157 */
1158 update_ust_app(ust_cmd.sock);
1159
5eb91c98
DG		 1160 ret = ustctl_register_done(ust_cmd.sock);
1161 if (ret < 0) {
1162 /*
1163 * If the registration is not possible, we simply
1164 * unregister the apps and continue
1165 */
56fff090 1166 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1167 } else {
1168 /*
1169 * We just need here to monitor the close of the UST
1170 * socket and poll set monitor those by default.
1171 */
1172 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1173 if (ret < 0) {
1174 goto error;
1175 }
1176
54d01ffb
DG		 1177 DBG("Apps with sock %d added to poll set",
1178 ust_cmd.sock);
5eb91c98 1179 }
487cf67c 1180
5eb91c98 1181 break;
0177d773 1182 }
5eb91c98
DG		 1183 } else {
1184 /*
54d01ffb
DG		 1185 * At this point, we know that a registered application made
1186 * the event at poll_wait.
5eb91c98
DG		 1187 */
1188 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1189 /* Removing from the poll set */
1190 ret = lttng_poll_del(&events, pollfd);
1191 if (ret < 0) {
1192 goto error;
1193 }
099e26bd 1194
b9d9b220 1195 /* Socket closed on remote end. */
56fff090 1196 ust_app_unregister(pollfd);
5eb91c98
DG		 1197 break;
1198 }
099e26bd
DG		 1199 }
1200 }
099e26bd
DG		 1201 }
1202
1203error:
1204 DBG("Application communication apps dying");
1205 close(apps_cmd_pipe[0]);
1206 close(apps_cmd_pipe[1]);
1207
5eb91c98 1208 lttng_poll_clean(&events);
099e26bd 1209
f6a9efaa
DG		 1210 rcu_thread_offline();
1211 rcu_unregister_thread();
099e26bd
DG		 1212 return NULL;
1213}
1214
1215/*
1216 * Dispatch request from the registration threads to the application
1217 * communication thread.
1218 */
1219static void *thread_dispatch_ust_registration(void *data)
1220{
1221 int ret;
1222 struct cds_wfq_node *node;
1223 struct ust_command *ust_cmd = NULL;
1224
1225 DBG("[thread] Dispatch UST command started");
1226
1227 while (!dispatch_thread_exit) {
1228 /* Atomically prepare the queue futex */
1229 futex_nto1_prepare(&ust_cmd_queue.futex);
1230
1231 do {
1232 /* Dequeue command for registration */
1233 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1234 if (node == NULL) {
00a17c97 1235 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1236 /* Continue thread execution */
1237 break;
1238 }
1239
1240 ust_cmd = caa_container_of(node, struct ust_command, node);
1241
2f50c8a3
DG		 1242 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1243 " gid:%d sock:%d name:%s (version %d.%d)",
1244 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1245 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1246 ust_cmd->sock, ust_cmd->reg_msg.name,
1247 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1248 /*
1249 * Inform apps thread of the new application registration. This
1250 * call is blocking so we can be assured that the data will be read
1251 * at some point in time or wait to the end of the world :)
1252 */
1253 ret = write(apps_cmd_pipe[1], ust_cmd,
1254 sizeof(struct ust_command));
1255 if (ret < 0) {
1256 perror("write apps cmd pipe");
1257 if (errno == EBADF) {
1258 /*
1259 * We can't inform the application thread to process
1260 * registration. We will exit or else application
1261 * registration will not occur and tracing will never
1262 * start.
1263 */
1264 goto error;
1265 }
1266 }
1267 free(ust_cmd);
1268 } while (node != NULL);
1269
1270 /* Futex wait on queue. Blocking call on futex() */
1271 futex_nto1_wait(&ust_cmd_queue.futex);
1272 }
1273
1274error:
1275 DBG("Dispatch thread dying");
1276 return NULL;
1277}
1278
1279/*
1280 * This thread manage application registration.
1281 */
1282static void *thread_registration_apps(void *data)
1d4b027a 1283{
5eb91c98
DG		 1284 int sock = 0, i, ret, pollfd;
1285 uint32_t revents, nb_fd;
1286 struct lttng_poll_event events;
099e26bd
DG		 1287 /*
1288 * Get allocated in this thread, enqueued to a global queue, dequeued and
1289 * freed in the manage apps thread.
1290 */
1291 struct ust_command *ust_cmd = NULL;
1d4b027a 1292
099e26bd 1293 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1294
1295 ret = lttcomm_listen_unix_sock(apps_sock);
1296 if (ret < 0) {
1297 goto error;
1298 }
1299
5eb91c98
DG		 1300 /*
1301 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1302 * more will be added to this poll set.
1303 */
1304 ret = create_thread_poll_set(&events, 2);
1305 if (ret < 0) {
1306 goto error;
1307 }
273ea72c 1308
5eb91c98
DG		 1309 /* Add the application registration socket */
1310 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1311 if (ret < 0) {
1312 goto error;
1313 }
273ea72c 1314
1d4b027a 1315 /* Notify all applications to register */
0fdd1e2c
DG		 1316 ret = notify_ust_apps(1);
1317 if (ret < 0) {
1318 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1319 "Execution continues but there might be problem for already\n"
1320 "running applications that wishes to register.");
0fdd1e2c 1321 }
1d4b027a
DG		 1322
1323 while (1) {
1324 DBG("Accepting application registration");
273ea72c 1325
5eb91c98
DG		 1326 nb_fd = LTTNG_POLL_GETNB(&events);
1327
273ea72c 1328 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1329 ret = lttng_poll_wait(&events, -1);
273ea72c 1330 if (ret < 0) {
273ea72c
DG		 1331 goto error;
1332 }
1333
5eb91c98
DG		 1334 for (i = 0; i < nb_fd; i++) {
1335 /* Fetch once the poll data */
1336 revents = LTTNG_POLL_GETEV(&events, i);
1337 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1338
5eb91c98
DG		 1339 /* Thread quit pipe has been closed. Killing thread. */
1340 ret = check_thread_quit_pipe(pollfd, revents);
1341 if (ret) {
90014c57
DG		 1342 goto error;
1343 }
1d4b027a 1344
5eb91c98
DG		 1345 /* Event on the registration socket */
1346 if (pollfd == apps_sock) {
1347 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1348 ERR("Register apps socket poll error");
1349 goto error;
1350 } else if (revents & LPOLLIN) {
1351 sock = lttcomm_accept_unix_sock(apps_sock);
1352 if (sock < 0) {
1353 goto error;
1354 }
099e26bd 1355
5eb91c98 1356 /* Create UST registration command for enqueuing */
ba7f0ae5 1357 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1358 if (ust_cmd == NULL) {
ba7f0ae5 1359 perror("ust command zmalloc");
5eb91c98
DG		 1360 goto error;
1361 }
1d4b027a 1362
5eb91c98
DG		 1363 /*
1364 * Using message-based transmissions to ensure we don't
1365 * have to deal with partially received messages.
1366 */
1367 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1368 sizeof(struct ust_register_msg));
1369 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1370 if (ret < 0) {
1371 perror("lttcomm_recv_unix_sock register apps");
1372 } else {
1373 ERR("Wrong size received on apps register");
1374 }
1375 free(ust_cmd);
1376 close(sock);
1377 continue;
1378 }
099e26bd 1379
5eb91c98 1380 ust_cmd->sock = sock;
099e26bd 1381
5eb91c98
DG		 1382 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1383 " gid:%d sock:%d name:%s (version %d.%d)",
1384 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1385 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1386 ust_cmd->sock, ust_cmd->reg_msg.name,
1387 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1388
5eb91c98
DG		 1389 /*
1390 * Lock free enqueue the registration request. The red pill
54d01ffb 1391 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1392 */
1393 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1394
1395 /*
1396 * Wake the registration queue futex. Implicit memory
1397 * barrier with the exchange in cds_wfq_enqueue.
1398 */
1399 futex_nto1_wake(&ust_cmd_queue.futex);
1400 }
1401 }
90014c57 1402 }
1d4b027a
DG		 1403 }
1404
1405error:
0fdd1e2c
DG		 1406 DBG("UST Registration thread dying");
1407
1408 /* Notify that the registration thread is gone */
1409 notify_ust_apps(0);
1410
1411 close(apps_sock);
1412 close(sock);
273ea72c 1413 unlink(apps_unix_sock_path);
0fdd1e2c 1414
5eb91c98
DG		 1415 lttng_poll_clean(&events);
1416
1d4b027a
DG		 1417 return NULL;
1418}
1419
8c0faa1d 1420/*
3bd1e081 1421 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1422 * exec or it will fails.
8c0faa1d 1423 */
3bd1e081 1424static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1425{
1426 int ret;
ee0b0061
DG		 1427 struct timespec timeout;
1428
1429 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1430 timeout.tv_nsec = 0;
8c0faa1d
DG		 1431
1432 /* Setup semaphore */
3bd1e081 1433 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1434 if (ret < 0) {
3bd1e081 1435 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1436 goto error;
1437 }
8c0faa1d 1438
3bd1e081
MD		 1439 ret = pthread_create(&consumer_data->thread, NULL,
1440 thread_manage_consumer, consumer_data);
8c0faa1d 1441 if (ret != 0) {
3bd1e081 1442 PERROR("pthread_create consumer");
ee0b0061 1443 ret = -1;
8c0faa1d
DG		 1444 goto error;
1445 }
1446
ee0b0061
DG		 1447 /* Get time for sem_timedwait absolute timeout */
1448 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1449 if (ret < 0) {
3bd1e081 1450 PERROR("clock_gettime spawn consumer");
ee0b0061 1451 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1452 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1453 } else {
1454 /* Normal timeout if the gettime was successful */
1455 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1456 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1457 }
8c0faa1d 1458
ee0b0061
DG		 1459 if (ret < 0) {
1460 if (errno == ETIMEDOUT) {
1461 /*
1462 * Call has timed out so we kill the kconsumerd_thread and return
1463 * an error.
1464 */
3bd1e081
MD		 1465 ERR("The consumer thread was never ready. Killing it");
1466 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1467 if (ret < 0) {
3bd1e081 1468 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1469 }
1470 } else {
3bd1e081 1471 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1472 }
1473 goto error;
1474 }
1475
3bd1e081
MD		 1476 pthread_mutex_lock(&consumer_data->pid_mutex);
1477 if (consumer_data->pid == 0) {
712ea556 1478 ERR("Kconsumerd did not start");
3bd1e081 1479 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1480 goto error;
1481 }
3bd1e081 1482 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1483
8c0faa1d
DG		 1484 return 0;
1485
1486error:
1487 return ret;
1488}
1489
d9800920 1490/*
3bd1e081 1491 * Join consumer thread
d9800920 1492 */
3bd1e081 1493static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1494{
1495 void *status;
1496 int ret;
1497
3bd1e081
MD		 1498 if (consumer_data->pid != 0) {
1499 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1500 if (ret) {
3bd1e081 1501 ERR("Error killing consumer daemon");
cf3af59e
MD		 1502 return ret;
1503 }
3bd1e081 1504 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1505 } else {
1506 return 0;
1507 }
1508}
1509
8c0faa1d 1510/*
3bd1e081 1511 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1512 *
d063d709 1513 * Return pid if successful else -1.
8c0faa1d 1514 */
3bd1e081 1515static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1516{
1517 int ret;
1518 pid_t pid;
94c55f17 1519 const char *consumer_to_use;
53086306 1520 const char *verbosity;
94c55f17 1521 struct stat st;
8c0faa1d 1522
3bd1e081 1523 DBG("Spawning consumerd");
c49dc785 1524
8c0faa1d
DG		 1525 pid = fork();
1526 if (pid == 0) {
1527 /*
3bd1e081 1528 * Exec consumerd.
8c0faa1d 1529 */
3bd1e081 1530 if (opt_verbose > 1 || opt_verbose_consumer) {
53086306
DG		 1531 verbosity = "--verbose";
1532 } else {
1533 verbosity = "--quiet";
1534 }
3bd1e081
MD		 1535 switch (consumer_data->type) {
1536 case LTTNG_CONSUMER_KERNEL:
94c55f17 1537 /*
f806231f
MD		 1538 * Find out which consumerd to execute. We will
1539 * first try the 64-bit path, then the
1540 * sessiond's installation directory, and
1541 * fallback on the 32-bit one,
94c55f17
AM		 1542 */
1543 if (stat(consumerd64_bin, &st) == 0) {
1544 consumer_to_use = consumerd64_bin;
94c55f17
AM		 1545 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1546 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4
MD		 1547 } else if (stat(consumerd32_bin, &st) == 0) {
1548 consumer_to_use = consumerd32_bin;
94c55f17
AM		 1549 } else {
1550 break;
1551 }
1552 DBG("Using kernel consumer at: %s", consumer_to_use);
1553 execl(consumer_to_use,
1554 "lttng-consumerd", verbosity, "-k",
1555 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1556 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1557 NULL);
3bd1e081 1558 break;
7753dea8
MD		 1559 case LTTNG_CONSUMER64_UST:
1560 {
b1e0b6b6 1561 char *tmpnew = NULL;
8f4905da
MD		 1562
1563 if (consumerd64_libdir[0] != '\0') {
1564 char *tmp;
1565 size_t tmplen;
1566
1567 tmp = getenv("LD_LIBRARY_PATH");
1568 if (!tmp) {
1569 tmp = "";
1570 }
1571 tmplen = strlen("LD_LIBRARY_PATH=")
1572 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1573 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1574 if (!tmpnew) {
1575 ret = -ENOMEM;
1576 goto error;
1577 }
1578 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1579 strcat(tmpnew, consumerd64_libdir);
1580 if (tmp[0] != '\0') {
1581 strcat(tmpnew, ":");
1582 strcat(tmpnew, tmp);
1583 }
1584 ret = putenv(tmpnew);
1585 if (ret) {
1586 ret = -errno;
1587 goto error;
1588 }
1589 }
94c55f17 1590 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1591 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1592 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1593 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1594 NULL);
8f4905da
MD		 1595 if (consumerd64_libdir[0] != '\0') {
1596 free(tmpnew);
1597 }
1598 if (ret) {
1599 goto error;
1600 }
3bd1e081 1601 break;
7753dea8
MD		 1602 }
1603 case LTTNG_CONSUMER32_UST:
1604 {
937dde8e 1605 char *tmpnew = NULL;
8f4905da
MD		 1606
1607 if (consumerd32_libdir[0] != '\0') {
1608 char *tmp;
1609 size_t tmplen;
1610
1611 tmp = getenv("LD_LIBRARY_PATH");
1612 if (!tmp) {
1613 tmp = "";
1614 }
1615 tmplen = strlen("LD_LIBRARY_PATH=")
1616 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1617 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1618 if (!tmpnew) {
1619 ret = -ENOMEM;
1620 goto error;
1621 }
1622 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1623 strcat(tmpnew, consumerd32_libdir);
1624 if (tmp[0] != '\0') {
1625 strcat(tmpnew, ":");
1626 strcat(tmpnew, tmp);
1627 }
1628 ret = putenv(tmpnew);
1629 if (ret) {
1630 ret = -errno;
1631 goto error;
1632 }
1633 }
94c55f17 1634 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1635 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1636 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1637 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1638 NULL);
8f4905da
MD		 1639 if (consumerd32_libdir[0] != '\0') {
1640 free(tmpnew);
1641 }
1642 if (ret) {
1643 goto error;
1644 }
7753dea8
MD		 1645 break;
1646 }
3bd1e081
MD		 1647 default:
1648 perror("unknown consumer type");
1649 exit(EXIT_FAILURE);
1650 }
8c0faa1d
DG		 1651 if (errno != 0) {
1652 perror("kernel start consumer exec");
1653 }
1654 exit(EXIT_FAILURE);
1655 } else if (pid > 0) {
1656 ret = pid;
8c0faa1d 1657 } else {
3bd1e081 1658 perror("start consumer fork");
8c0faa1d 1659 ret = -errno;
8c0faa1d 1660 }
8f4905da 1661error:
8c0faa1d
DG		 1662 return ret;
1663}
1664
693bd40b 1665/*
3bd1e081 1666 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1667 */
3bd1e081 1668static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1669{
1670 int ret;
1671
3bd1e081
MD		 1672 pthread_mutex_lock(&consumer_data->pid_mutex);
1673 if (consumer_data->pid != 0) {
1674 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1675 goto end;
1676 }
693bd40b 1677
3bd1e081 1678 ret = spawn_consumerd(consumer_data);
c49dc785 1679 if (ret < 0) {
3bd1e081
MD		 1680 ERR("Spawning consumerd failed");
1681 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1682 goto error;
693bd40b 1683 }
c49dc785 1684
3bd1e081
MD		 1685 /* Setting up the consumer_data pid */
1686 consumer_data->pid = ret;
48842b30 1687 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1688 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1689
3bd1e081
MD		 1690 DBG2("Spawning consumer control thread");
1691 ret = spawn_consumer_thread(consumer_data);
693bd40b 1692 if (ret < 0) {
3bd1e081 1693 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1694 goto error;
1695 }
1696
c49dc785 1697end:
693bd40b
DG		 1698 return 0;
1699
1700error:
1701 return ret;
1702}
1703
b73401da 1704/*
d063d709 1705 * modprobe_kernel_modules
b73401da
DG		 1706 */
1707static int modprobe_kernel_modules(void)
1708{
ab147185 1709 int ret = 0, i;
b73401da
DG		 1710 char modprobe[256];
1711
ab147185
MD		 1712 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1713 ret = snprintf(modprobe, sizeof(modprobe),
1714 "/sbin/modprobe %s%s",
24b487b8 1715 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1716 kernel_modules_list[i].name);
b73401da
DG		 1717 if (ret < 0) {
1718 perror("snprintf modprobe");
1719 goto error;
1720 }
ab147185 1721 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1722 ret = system(modprobe);
ab147185
MD		 1723 if (ret == -1) {
1724 ERR("Unable to launch modprobe for module %s",
1725 kernel_modules_list[i].name);
1726 } else if (kernel_modules_list[i].required
d9800920 1727 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1728 ERR("Unable to load module %s",
1729 kernel_modules_list[i].name);
1730 } else {
1731 DBG("Modprobe successfully %s",
1732 kernel_modules_list[i].name);
1733 }
1734 }
1735
1736error:
1737 return ret;
1738}
1739
b73401da 1740/*
d063d709 1741 * mount_debugfs
b73401da
DG		 1742 */
1743static int mount_debugfs(char *path)
1744{
1745 int ret;
1746 char *type = "debugfs";
1747
67f747d8 1748 ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1749 if (ret < 0) {
7272acf5 1750 PERROR("Cannot create debugfs path");
b73401da
DG		 1751 goto error;
1752 }
1753
1754 ret = mount(type, path, type, 0, NULL);
1755 if (ret < 0) {
7272acf5 1756 PERROR("Cannot mount debugfs");
b73401da
DG		 1757 goto error;
1758 }
1759
1760 DBG("Mounted debugfs successfully at %s", path);
1761
1762error:
1763 return ret;
1764}
1765
8c0faa1d 1766/*
d063d709 1767 * Setup necessary data for kernel tracer action.
8c0faa1d 1768 */
f3ed775e 1769static void init_kernel_tracer(void)
8c0faa1d 1770{
b73401da
DG		 1771 int ret;
1772 char *proc_mounts = "/proc/mounts";
1773 char line[256];
684d34d2 1774 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1775 FILE *fp;
1776
1777 /* Detect debugfs */
1778 fp = fopen(proc_mounts, "r");
1779 if (fp == NULL) {
1780 ERR("Unable to probe %s", proc_mounts);
1781 goto error;
1782 }
1783
1784 while (fgets(line, sizeof(line), fp) != NULL) {
1785 if (strstr(line, "debugfs") != NULL) {
1786 /* Remove first string */
1787 strtok(line, " ");
1788 /* Dup string here so we can reuse line later on */
1789 debugfs_path = strdup(strtok(NULL, " "));
1790 DBG("Got debugfs path : %s", debugfs_path);
1791 break;
1792 }
1793 }
1794
1795 fclose(fp);
1796
1797 /* Mount debugfs if needded */
1798 if (debugfs_path == NULL) {
1799 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1800 if (ret < 0) {
1801 perror("asprintf debugfs path");
1802 goto error;
1803 }
1804 ret = mount_debugfs(debugfs_path);
1805 if (ret < 0) {
7272acf5 1806 perror("Cannot mount debugfs");
b73401da
DG		 1807 goto error;
1808 }
1809 }
1810
1811 /* Modprobe lttng kernel modules */
1812 ret = modprobe_kernel_modules();
1813 if (ret < 0) {
1814 goto error;
1815 }
1816
1817 /* Setup lttng kernel path */
1818 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1819 if (ret < 0) {
1820 perror("asprintf lttng path");
1821 goto error;
1822 }
1823
1824 /* Open debugfs lttng */
1825 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1826 if (kernel_tracer_fd < 0) {
b73401da
DG		 1827 DBG("Failed to open %s", lttng_path);
1828 goto error;
8c0faa1d
DG		 1829 }
1830
b73401da
DG		 1831 free(lttng_path);
1832 free(debugfs_path);
f3ed775e 1833 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1834 return;
1835
1836error:
1837 if (lttng_path) {
1838 free(lttng_path);
1839 }
1840 if (debugfs_path) {
1841 free(debugfs_path);
1842 }
1843 WARN("No kernel tracer available");
1844 kernel_tracer_fd = 0;
1845 return;
f3ed775e 1846}
33a2b854 1847
f3ed775e 1848/*
54d01ffb 1849 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1850 */
54d01ffb 1851static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1852{
f40799e8 1853 int ret = 0;
8c0faa1d 1854
3bd1e081 1855 if (session->consumer_fds_sent == 0) {
d9800920 1856 /*
54d01ffb
DG		 1857 * Assign default kernel consumer socket if no consumer assigned to the
1858 * kernel session. At this point, it's NOT suppose to be 0 but this is
1859 * an extra security check.
d9800920
DG		 1860 */
1861 if (session->consumer_fd == 0) {
3bd1e081 1862 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1863 }
1864
2bdd86d4 1865 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1866 if (ret < 0) {
f3ed775e
DG		 1867 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1868 goto error;
1869 }
1d4b027a 1870
3bd1e081 1871 session->consumer_fds_sent = 1;
f3ed775e 1872 }
1d4b027a
DG		 1873
1874error:
1875 return ret;
8c0faa1d
DG		 1876}
1877
0177d773
DG		 1878/*
1879 * Create an UST session and add it to the session ust list.
1880 */
44d3bd01 1881static int create_ust_session(struct ltt_session *session,
6df2e2c9 1882 struct lttng_domain *domain)
0177d773 1883{
13384287 1884 struct ltt_ust_session *lus = NULL;
6df2e2c9 1885 int ret;
44d3bd01
DG		 1886
1887 switch (domain->type) {
48842b30 1888 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1889 break;
1890 default:
13384287 1891 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1892 goto error;
1893 }
0177d773
DG		 1894
1895 DBG("Creating UST session");
1896
a991f516 1897 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1898 if (lus == NULL) {
44d3bd01 1899 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1900 goto error;
1901 }
1902
67f747d8 1903 ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1904 session->uid, session->gid);
0177d773
DG		 1905 if (ret < 0) {
1906 if (ret != -EEXIST) {
1907 ERR("Trace directory creation error");
44d3bd01 1908 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1909 goto error;
1910 }
1911 }
1912
f6a9efaa
DG		 1913 /* The domain type dictate different actions on session creation */
1914 switch (domain->type) {
48842b30
DG		 1915 case LTTNG_DOMAIN_UST:
1916 /* No ustctl for the global UST domain */
1917 break;
1918 default:
36dc12cc 1919 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1920 goto error;
0177d773 1921 }
6df2e2c9
MD		 1922 lus->uid = session->uid;
1923 lus->gid = session->gid;
f6a9efaa 1924 session->ust_session = lus;
44d3bd01
DG		 1925
1926 return LTTCOMM_OK;
0177d773
DG		 1927
1928error:
1929 free(lus);
1930 return ret;
1931}
1932
333f285e 1933/*
d063d709 1934 * Create a kernel tracer session then create the default channel.
333f285e 1935 */
6df2e2c9 1936static int create_kernel_session(struct ltt_session *session)
333f285e 1937{
f3ed775e 1938 int ret;
f3ed775e
DG		 1939
1940 DBG("Creating kernel session");
1941
1942 ret = kernel_create_session(session, kernel_tracer_fd);
1943 if (ret < 0) {
1944 ret = LTTCOMM_KERN_SESS_FAIL;
1945 goto error;
333f285e
DG		 1946 }
1947
d9800920 1948 /* Set kernel consumer socket fd */
3bd1e081
MD		 1949 if (kconsumer_data.cmd_sock) {
1950 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1951 }
1952
67f747d8 1953 ret = mkdir_recursive_run_as(session->kernel_session->trace_path,
6df2e2c9 1954 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1955 if (ret < 0) {
996b65c8 1956 if (ret != -EEXIST) {
7a485870
DG		 1957 ERR("Trace directory creation error");
1958 goto error;
1959 }
1960 }
6df2e2c9
MD		 1961 session->kernel_session->uid = session->uid;
1962 session->kernel_session->gid = session->gid;
7a485870 1963
f3ed775e
DG		 1964error:
1965 return ret;
333f285e
DG		 1966}
1967
6c9cc2ab
DG		 1968/*
1969 * Using the session list, filled a lttng_session array to send back to the
1970 * client for session listing.
1971 *
1972 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1973 * session_lock_list() and session_unlock_list().
6c9cc2ab
DG		 1974 */
1975static void list_lttng_sessions(struct lttng_session *sessions)
1976{
1977 int i = 0;
1978 struct ltt_session *session;
1979
1980 DBG("Getting all available session");
1981 /*
1982 * Iterate over session list and append data after the control struct in
1983 * the buffer.
1984 */
1985 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1986 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1987 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1988 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1989 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1990 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1991 i++;
1992 }
1993}
1994
9f19cc17
DG		 1995/*
1996 * Fill lttng_channel array of all channels.
1997 */
b551a063 1998static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1999 struct lttng_channel *channels)
2000{
2001 int i = 0;
2002 struct ltt_kernel_channel *kchan;
2003
2004 DBG("Listing channels for session %s", session->name);
2005
b551a063
DG		 2006 switch (domain) {
2007 case LTTNG_DOMAIN_KERNEL:
2008 /* Kernel channels */
2009 if (session->kernel_session != NULL) {
2010 cds_list_for_each_entry(kchan,
2011 &session->kernel_session->channel_list.head, list) {
2012 /* Copy lttng_channel struct to array */
2013 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2014 channels[i].enabled = kchan->enabled;
2015 i++;
2016 }
2017 }
2018 break;
2019 case LTTNG_DOMAIN_UST:
2020 {
2021 struct cds_lfht_iter iter;
2022 struct ltt_ust_channel *uchan;
2023
2024 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2025 &iter, uchan, node) {
2026 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2027 channels[i].attr.overwrite = uchan->attr.overwrite;
2028 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2029 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2030 channels[i].attr.switch_timer_interval =
2031 uchan->attr.switch_timer_interval;
2032 channels[i].attr.read_timer_interval =
2033 uchan->attr.read_timer_interval;
aea829b3 2034 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2035 switch (uchan->attr.output) {
2036 case LTTNG_UST_MMAP:
2037 default:
2038 channels[i].attr.output = LTTNG_EVENT_MMAP;
2039 break;
2040 }
befe0905 2041 i++;
b551a063
DG		 2042 }
2043 break;
2044 }
2045 default:
2046 break;
2047 }
2048}
2049
2050/*
2051 * Create a list of ust global domain events.
2052 */
2053static int list_lttng_ust_global_events(char *channel_name,
2054 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2055{
2056 int i = 0, ret = 0;
2057 unsigned int nb_event = 0;
2058 struct cds_lfht_iter iter;
d7b75b30 2059 struct cds_lfht_node *node;
b551a063
DG		 2060 struct ltt_ust_channel *uchan;
2061 struct ltt_ust_event *uevent;
2062 struct lttng_event *tmp;
2063
2064 DBG("Listing UST global events for channel %s", channel_name);
2065
2066 rcu_read_lock();
2067
d7b75b30
DG		 2068 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2069 strlen(channel_name), &iter);
2070 if (node == NULL) {
2071 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2072 goto error;
b551a063
DG		 2073 }
2074
d7b75b30
DG		 2075 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2076
2077 nb_event += hashtable_get_count(uchan->events);
2078
b551a063
DG		 2079 if (nb_event == 0) {
2080 ret = nb_event;
2081 goto error;
2082 }
2083
2084 DBG3("Listing UST global %d events", nb_event);
2085
2086 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2087 if (tmp == NULL) {
2088 ret = -LTTCOMM_FATAL;
2089 goto error;
2090 }
2091
d7b75b30
DG		 2092 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2093 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2094 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2095 tmp[i].enabled = uevent->enabled;
2096 switch (uevent->attr.instrumentation) {
2097 case LTTNG_UST_TRACEPOINT:
2098 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2099 break;
2100 case LTTNG_UST_PROBE:
2101 tmp[i].type = LTTNG_EVENT_PROBE;
2102 break;
2103 case LTTNG_UST_FUNCTION:
2104 tmp[i].type = LTTNG_EVENT_FUNCTION;
2105 break;
ac3bd9c0 2106 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2107 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2108 break;
9f19cc17 2109 }
d7b75b30 2110 i++;
9f19cc17
DG		 2111 }
2112
b551a063
DG		 2113 ret = nb_event;
2114 *events = tmp;
2115
2116error:
2117 rcu_read_unlock();
2118 return ret;
9f19cc17
DG		 2119}
2120
2121/*
b551a063 2122 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2123 */
b551a063
DG		 2124static int list_lttng_kernel_events(char *channel_name,
2125 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2126{
b551a063
DG		 2127 int i = 0, ret;
2128 unsigned int nb_event;
9f19cc17 2129 struct ltt_kernel_event *event;
b551a063
DG		 2130 struct ltt_kernel_channel *kchan;
2131
2132 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2133 if (kchan == NULL) {
2134 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2135 goto error;
2136 }
2137
2138 nb_event = kchan->event_count;
9f19cc17
DG		 2139
2140 DBG("Listing events for channel %s", kchan->channel->name);
2141
b551a063
DG		 2142 if (nb_event == 0) {
2143 ret = nb_event;
2144 goto error;
2145 }
2146
2147 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2148 if (*events == NULL) {
2149 ret = LTTCOMM_FATAL;
2150 goto error;
2151 }
2152
9f19cc17
DG		 2153 /* Kernel channels */
2154 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2155 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2156 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2157 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2158 switch (event->event->instrumentation) {
2159 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2160 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2161 break;
2162 case LTTNG_KERNEL_KPROBE:
2163 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2164 (*events)[i].type = LTTNG_EVENT_PROBE;
2165 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2166 sizeof(struct lttng_kernel_kprobe));
2167 break;
2168 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2169 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2170 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2171 sizeof(struct lttng_kernel_function));
2172 break;
0133c199 2173 case LTTNG_KERNEL_NOOP:
b551a063 2174 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2175 break;
a54bd42d 2176 case LTTNG_KERNEL_SYSCALL:
b551a063 2177 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2178 break;
7a3d1328
MD		 2179 case LTTNG_KERNEL_ALL:
2180 assert(0);
2181 break;
9f19cc17
DG		 2182 }
2183 i++;
2184 }
b551a063
DG		 2185
2186 return nb_event;
2187
2188error:
2189 return ret;
9f19cc17
DG		 2190}
2191
fac6795d 2192/*
54d01ffb 2193 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2194 */
54d01ffb
DG		 2195static int cmd_disable_channel(struct ltt_session *session,
2196 int domain, char *channel_name)
fac6795d 2197{
54d01ffb 2198 int ret;
78f0bacd
DG		 2199 struct ltt_ust_session *usess;
2200
2201 usess = session->ust_session;
379473d2 2202
54d01ffb 2203 switch (domain) {
78f0bacd
DG		 2204 case LTTNG_DOMAIN_KERNEL:
2205 {
2206 ret = channel_kernel_disable(session->kernel_session,
2207 channel_name);
2208 if (ret != LTTCOMM_OK) {
2209 goto error;
2210 }
54d01ffb 2211
78f0bacd
DG		 2212 kernel_wait_quiescent(kernel_tracer_fd);
2213 break;
2214 }
2215 case LTTNG_DOMAIN_UST:
2216 {
2217 struct ltt_ust_channel *uchan;
7885e399 2218 struct cds_lfht *chan_ht;
78f0bacd 2219
7885e399
DG		 2220 chan_ht = usess->domain_global.channels;
2221
2222 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2223 if (uchan == NULL) {
2224 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2225 goto error;
78f0bacd
DG		 2226 }
2227
7885e399
DG		 2228 ret = channel_ust_disable(usess, domain, uchan);
2229 if (ret != LTTCOMM_OK) {
78f0bacd
DG		 2230 goto error;
2231 }
78f0bacd
DG		 2232 break;
2233 }
2234 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2235 case LTTNG_DOMAIN_UST_EXEC_NAME:
2236 case LTTNG_DOMAIN_UST_PID:
2237 ret = LTTCOMM_NOT_IMPLEMENTED;
2238 goto error;
2239 default:
2240 ret = LTTCOMM_UNKNOWN_DOMAIN;
2241 goto error;
20fe2104
DG		 2242 }
2243
54d01ffb 2244 ret = LTTCOMM_OK;
d65106b1 2245
54d01ffb
DG		 2246error:
2247 return ret;
2248}
2249
2250/*
2251 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2252 */
44d3bd01 2253static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2254 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2255{
2256 int ret;
f6a9efaa 2257 struct ltt_ust_session *usess = session->ust_session;
7885e399 2258 struct cds_lfht *chan_ht;
f6a9efaa 2259
5d56b5aa 2260 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2261
aea829b3 2262 switch (domain) {
44d3bd01
DG		 2263 case LTTNG_DOMAIN_KERNEL:
2264 {
2265 struct ltt_kernel_channel *kchan;
54d01ffb 2266
44d3bd01
DG		 2267 kchan = trace_kernel_get_channel_by_name(attr->name,
2268 session->kernel_session);
2269 if (kchan == NULL) {
2270 ret = channel_kernel_create(session->kernel_session,
2271 attr, kernel_poll_pipe[1]);
2272 } else {
2273 ret = channel_kernel_enable(session->kernel_session, kchan);
2274 }
2275
2276 if (ret != LTTCOMM_OK) {
2277 goto error;
2278 }
2279
2280 kernel_wait_quiescent(kernel_tracer_fd);
2281 break;
2282 }
f6a9efaa
DG		 2283 case LTTNG_DOMAIN_UST:
2284 {
2285 struct ltt_ust_channel *uchan;
2286
7885e399 2287 chan_ht = usess->domain_global.channels;
f6a9efaa 2288
7885e399 2289 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2290 if (uchan == NULL) {
7885e399 2291 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2292 } else {
7885e399 2293 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2294 }
f6a9efaa
DG		 2295 break;
2296 }
78f0bacd
DG		 2297 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2298 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2299 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG		 2300 ret = LTTCOMM_NOT_IMPLEMENTED;
2301 goto error;
44d3bd01
DG		 2302 default:
2303 ret = LTTCOMM_UNKNOWN_DOMAIN;
2304 goto error;
54d01ffb
DG		 2305 }
2306
54d01ffb
DG		 2307error:
2308 return ret;
2309}
2310
2311/*
2312 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2313 */
2314static int cmd_disable_event(struct ltt_session *session, int domain,
2315 char *channel_name, char *event_name)
2316{
2317 int ret;
54d01ffb
DG		 2318
2319 switch (domain) {
2320 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2321 {
2322 struct ltt_kernel_channel *kchan;
b0a40d28 2323 struct ltt_kernel_session *ksess;
2bdd86d4 2324
b0a40d28
DG		 2325 ksess = session->kernel_session;
2326
2327 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2328 if (kchan == NULL) {
2329 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2330 goto error;
d65106b1
DG		 2331 }
2332
b0a40d28 2333 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2334 if (ret != LTTCOMM_OK) {
2335 goto error;
2336 }
2337
2338 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2339 break;
2bdd86d4
MD		 2340 }
2341 case LTTNG_DOMAIN_UST:
b0a40d28 2342 {
b0a40d28 2343 struct ltt_ust_channel *uchan;
7f79d3a1 2344 struct ltt_ust_session *usess;
b0a40d28
DG		 2345
2346 usess = session->ust_session;
2347
2348 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2349 channel_name);
2350 if (uchan == NULL) {
2351 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2352 goto error;
2353 }
2354
7f79d3a1
DG		 2355 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2356 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2357 goto error;
2358 }
2359
7f79d3a1 2360 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2361 channel_name);
b0a40d28
DG		 2362 break;
2363 }
2bdd86d4
MD		 2364 case LTTNG_DOMAIN_UST_EXEC_NAME:
2365 case LTTNG_DOMAIN_UST_PID:
2366 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2367 default:
54d01ffb
DG		 2368 ret = LTTCOMM_NOT_IMPLEMENTED;
2369 goto error;
d65106b1 2370 }
26cc6b4e 2371
54d01ffb
DG		 2372 ret = LTTCOMM_OK;
2373
2374error:
2375 return ret;
2376}
2377
2378/*
2379 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2380 */
2381static int cmd_disable_event_all(struct ltt_session *session, int domain,
2382 char *channel_name)
2383{
2384 int ret;
54d01ffb
DG		 2385
2386 switch (domain) {
2387 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2388 {
2389 struct ltt_kernel_session *ksess;
2390 struct ltt_kernel_channel *kchan;
2391
2392 ksess = session->kernel_session;
2393
2394 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2395 if (kchan == NULL) {
2396 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2397 goto error;
26cc6b4e
DG		 2398 }
2399
9730260e 2400 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2401 if (ret != LTTCOMM_OK) {
0b97ec54 2402 goto error;
26cc6b4e
DG		 2403 }
2404
54d01ffb 2405 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2406 break;
9730260e
DG		 2407 }
2408 case LTTNG_DOMAIN_UST:
2409 {
2410 struct ltt_ust_session *usess;
2411 struct ltt_ust_channel *uchan;
2412
2413 usess = session->ust_session;
2414
2415 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2416 channel_name);
2417 if (uchan == NULL) {
2418 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2419 goto error;
2420 }
2421
7f79d3a1
DG		 2422 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2423 if (ret != 0) {
9730260e
DG		 2424 goto error;
2425 }
2426
7f79d3a1 2427 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2428
2429 break;
2430 }
2431 case LTTNG_DOMAIN_UST_EXEC_NAME:
2432 case LTTNG_DOMAIN_UST_PID:
2433 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2434 default:
54d01ffb
DG		 2435 ret = LTTCOMM_NOT_IMPLEMENTED;
2436 goto error;
26cc6b4e 2437 }
e953ef25 2438
54d01ffb 2439 ret = LTTCOMM_OK;
e953ef25 2440
54d01ffb
DG		 2441error:
2442 return ret;
2443}
f5177a38 2444
54d01ffb
DG		 2445/*
2446 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2447 */
2448static int cmd_add_context(struct ltt_session *session, int domain,
2449 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2450{
2451 int ret;
f5177a38 2452
54d01ffb
DG		 2453 switch (domain) {
2454 case LTTNG_DOMAIN_KERNEL:
2455 /* Add kernel context to kernel tracer */
2456 ret = context_kernel_add(session->kernel_session, ctx,
2457 event_name, channel_name);
2458 if (ret != LTTCOMM_OK) {
f5177a38 2459 goto error;
e953ef25 2460 }
2bdd86d4
MD		 2461 break;
2462 case LTTNG_DOMAIN_UST:
2463 {
55cc08a6 2464 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2465
55cc08a6
DG		 2466 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2467 if (ret != LTTCOMM_OK) {
2468 goto error;
2bdd86d4 2469 }
e953ef25 2470 break;
2bdd86d4 2471 }
55cc08a6
DG		 2472 case LTTNG_DOMAIN_UST_EXEC_NAME:
2473 case LTTNG_DOMAIN_UST_PID:
2474 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2475 default:
54d01ffb
DG		 2476 ret = LTTCOMM_NOT_IMPLEMENTED;
2477 goto error;
e953ef25 2478 }
950131af 2479
54d01ffb 2480 ret = LTTCOMM_OK;
950131af 2481
54d01ffb
DG		 2482error:
2483 return ret;
2484}
2485
2486/*
2487 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD		 2488 *
2489 * TODO: currently, both events and loglevels are kept within the same
2490 * namespace for UST global registry/app registery, so if an event
2491 * happen to have the same name as the loglevel (very unlikely though),
2492 * and an attempt is made to enable/disable both in the same session,
2493 * the first to be created will be the only one allowed to exist.
54d01ffb
DG		 2494 */
2495static int cmd_enable_event(struct ltt_session *session, int domain,
2496 char *channel_name, struct lttng_event *event)
2497{
2498 int ret;
f6cd6b0f 2499 struct lttng_channel *attr;
48842b30 2500 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2501
2502 switch (domain) {
2503 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2504 {
2505 struct ltt_kernel_channel *kchan;
2506
54d01ffb
DG		 2507 kchan = trace_kernel_get_channel_by_name(channel_name,
2508 session->kernel_session);
2509 if (kchan == NULL) {
f6cd6b0f
DG		 2510 attr = channel_new_default_attr(domain);
2511 if (attr == NULL) {
2512 ret = LTTCOMM_FATAL;
2513 goto error;
2514 }
2515 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2516
54d01ffb 2517 /* This call will notify the kernel thread */
44d3bd01 2518 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2519 attr, kernel_poll_pipe[1]);
54d01ffb 2520 if (ret != LTTCOMM_OK) {
ff4d74e6 2521 free(attr);
f5177a38
DG		 2522 goto error;
2523 }
ff4d74e6 2524 free(attr);
54d01ffb 2525 }
950131af 2526
54d01ffb
DG		 2527 /* Get the newly created kernel channel pointer */
2528 kchan = trace_kernel_get_channel_by_name(channel_name,
2529 session->kernel_session);
2530 if (kchan == NULL) {
2531 /* This sould not happen... */
2532 ret = LTTCOMM_FATAL;
2533 goto error;
2534 }
f5177a38 2535
48842b30
DG		 2536 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2537 event);
54d01ffb 2538 if (ret != LTTCOMM_OK) {
f5177a38 2539 goto error;
950131af
DG		 2540 }
2541
54d01ffb 2542 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2543 break;
2bdd86d4
MD		 2544 }
2545 case LTTNG_DOMAIN_UST:
2546 {
aea829b3 2547 struct lttng_channel *attr;
edb67388 2548 struct ltt_ust_channel *uchan;
2bdd86d4 2549
edb67388 2550 /* Get channel from global UST domain */
48842b30
DG		 2551 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2552 channel_name);
2553 if (uchan == NULL) {
aea829b3
DG		 2554 /* Create default channel */
2555 attr = channel_new_default_attr(domain);
2556 if (attr == NULL) {
2557 ret = LTTCOMM_FATAL;
2558 goto error;
2559 }
596219f7 2560 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2561 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2562
7885e399 2563 ret = channel_ust_create(usess, domain, attr);
edb67388 2564 if (ret != LTTCOMM_OK) {
ff4d74e6 2565 free(attr);
aea829b3
DG		 2566 goto error;
2567 }
aea829b3
DG		 2568 free(attr);
2569
2570 /* Get the newly created channel reference back */
2571 uchan = trace_ust_find_channel_by_name(
2572 usess->domain_global.channels, channel_name);
2573 if (uchan == NULL) {
2574 /* Something is really wrong */
2575 ret = LTTCOMM_FATAL;
2576 goto error;
2577 }
48842b30 2578 }
2bdd86d4 2579
edb67388 2580 /* At this point, the session and channel exist on the tracer */
d5cd1f34 2581
edb67388
DG		 2582 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2583 if (ret != LTTCOMM_OK) {
48842b30 2584 goto error;
2bdd86d4
MD		 2585 }
2586 break;
2587 }
2588 case LTTNG_DOMAIN_UST_EXEC_NAME:
2589 case LTTNG_DOMAIN_UST_PID:
2590 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2591 default:
54d01ffb
DG		 2592 ret = LTTCOMM_NOT_IMPLEMENTED;
2593 goto error;
950131af 2594 }
d36b8583 2595
54d01ffb 2596 ret = LTTCOMM_OK;
d36b8583 2597
54d01ffb
DG		 2598error:
2599 return ret;
2600}
7d29a247 2601
54d01ffb
DG		 2602/*
2603 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2604 */
2605static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2606 char *channel_name, int event_type)
54d01ffb
DG		 2607{
2608 int ret;
2609 struct ltt_kernel_channel *kchan;
7d29a247 2610
54d01ffb
DG		 2611 switch (domain) {
2612 case LTTNG_DOMAIN_KERNEL:
2613 kchan = trace_kernel_get_channel_by_name(channel_name,
2614 session->kernel_session);
2615 if (kchan == NULL) {
2616 /* This call will notify the kernel thread */
44d3bd01
DG		 2617 ret = channel_kernel_create(session->kernel_session, NULL,
2618 kernel_poll_pipe[1]);
54d01ffb
DG		 2619 if (ret != LTTCOMM_OK) {
2620 goto error;
d36b8583 2621 }
0d0c377a 2622
8f69e5eb
DG		 2623 /* Get the newly created kernel channel pointer */
2624 kchan = trace_kernel_get_channel_by_name(channel_name,
2625 session->kernel_session);
2626 if (kchan == NULL) {
2627 /* This sould not happen... */
2628 ret = LTTCOMM_FATAL;
2629 goto error;
2630 }
2631
54d01ffb 2632 }
0fdd1e2c 2633
7a3d1328 2634 switch (event_type) {
76d45b40 2635 case LTTNG_EVENT_SYSCALL:
7a3d1328 2636 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2637 kchan, kernel_tracer_fd);
7a3d1328 2638 break;
76d45b40 2639 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2640 /*
7a3d1328
MD		 2641 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2642 * events already registered to the channel.
8c9ae521 2643 */
7a3d1328
MD		 2644 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2645 kchan, kernel_tracer_fd);
2646 break;
76d45b40 2647 case LTTNG_EVENT_ALL:
7a3d1328 2648 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2649 ret = event_kernel_enable_all(session->kernel_session,
2650 kchan, kernel_tracer_fd);
7a3d1328
MD		 2651 break;
2652 default:
2653 ret = LTTCOMM_KERN_ENABLE_FAIL;
2654 goto error;
8c9ae521 2655 }
8f69e5eb
DG		 2656
2657 /* Manage return value */
54d01ffb 2658 if (ret != LTTCOMM_OK) {
0d0c377a 2659 goto error;
d36b8583
DG		 2660 }
2661
54d01ffb 2662 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2663 break;
76d45b40
DG		 2664 case LTTNG_DOMAIN_UST:
2665 {
2666 struct lttng_channel *attr;
2667 struct ltt_ust_channel *uchan;
2668 struct ltt_ust_session *usess = session->ust_session;
2669
2670 /* Get channel from global UST domain */
2671 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2672 channel_name);
2673 if (uchan == NULL) {
2674 /* Create default channel */
2675 attr = channel_new_default_attr(domain);
2676 if (attr == NULL) {
2677 ret = LTTCOMM_FATAL;
2678 goto error;
2679 }
2680 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2681 attr->name[NAME_MAX - 1] = '\0';
2682
2683 /* Use the internal command enable channel */
7885e399 2684 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2685 if (ret != LTTCOMM_OK) {
2686 free(attr);
2687 goto error;
2688 }
2689 free(attr);
2690
2691 /* Get the newly created channel reference back */
2692 uchan = trace_ust_find_channel_by_name(
2693 usess->domain_global.channels, channel_name);
2694 if (uchan == NULL) {
2695 /* Something is really wrong */
2696 ret = LTTCOMM_FATAL;
2697 goto error;
2698 }
2699 }
2700
2701 /* At this point, the session and channel exist on the tracer */
2702
2703 switch (event_type) {
2704 case LTTNG_EVENT_ALL:
2705 case LTTNG_EVENT_TRACEPOINT:
2706 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2707 if (ret != LTTCOMM_OK) {
2708 goto error;
2709 }
2710 break;
2711 default:
2712 ret = LTTCOMM_UST_ENABLE_FAIL;
2713 goto error;
2714 }
2715
2716 /* Manage return value */
2717 if (ret != LTTCOMM_OK) {
2718 goto error;
2719 }
2720
2721 break;
2722 }
2723 case LTTNG_DOMAIN_UST_EXEC_NAME:
2724 case LTTNG_DOMAIN_UST_PID:
2725 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2726 default:
54d01ffb
DG		 2727 ret = LTTCOMM_NOT_IMPLEMENTED;
2728 goto error;
d36b8583 2729 }
f3ed775e 2730
54d01ffb
DG		 2731 ret = LTTCOMM_OK;
2732
2733error:
2734 return ret;
2735}
2736
2737/*
2738 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2739 */
2740static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2741{
2742 int ret;
2743 ssize_t nb_events = 0;
2744
2745 switch (domain) {
2746 case LTTNG_DOMAIN_KERNEL:
2747 nb_events = kernel_list_events(kernel_tracer_fd, events);
2748 if (nb_events < 0) {
2749 ret = LTTCOMM_KERN_LIST_FAIL;
2750 goto error;
894be886 2751 }
54d01ffb 2752 break;
b551a063
DG		 2753 case LTTNG_DOMAIN_UST:
2754 nb_events = ust_app_list_events(events);
2755 if (nb_events < 0) {
2756 ret = LTTCOMM_UST_LIST_FAIL;
2757 goto error;
2758 }
2759 break;
54d01ffb 2760 default:
54d01ffb
DG		 2761 ret = LTTCOMM_NOT_IMPLEMENTED;
2762 goto error;
2763 }
894be886 2764
54d01ffb 2765 return nb_events;
7d29a247 2766
54d01ffb
DG		 2767error:
2768 /* Return negative value to differentiate return code */
2769 return -ret;
2770}
b389abbe 2771
54d01ffb
DG		 2772/*
2773 * Command LTTNG_START_TRACE processed by the client thread.
2774 */
2775static int cmd_start_trace(struct ltt_session *session)
2776{
2777 int ret;
54d01ffb 2778 struct ltt_kernel_session *ksession;
b9d9b220 2779 struct ltt_ust_session *usess;
b389abbe 2780
54d01ffb
DG		 2781 /* Short cut */
2782 ksession = session->kernel_session;
b9d9b220 2783 usess = session->ust_session;
5eb91c98 2784
b9ef1c83
DG		 2785 if (session->enabled) {
2786 ret = LTTCOMM_UST_START_FAIL;
2787 goto error;
2788 }
2789
464dd62d
MD		 2790 session->enabled = 1;
2791
54d01ffb
DG		 2792 /* Kernel tracing */
2793 if (ksession != NULL) {
2bdd86d4
MD		 2794 struct ltt_kernel_channel *kchan;
2795
54d01ffb
DG		 2796 /* Open kernel metadata */
2797 if (ksession->metadata == NULL) {
2798 ret = kernel_open_metadata(ksession, ksession->trace_path);
2799 if (ret < 0) {
2800 ret = LTTCOMM_KERN_META_FAIL;
2801 goto error;
b389abbe 2802 }
54d01ffb 2803 }
7d29a247 2804
54d01ffb
DG		 2805 /* Open kernel metadata stream */
2806 if (ksession->metadata_stream_fd == 0) {
2807 ret = kernel_open_metadata_stream(ksession);
2808 if (ret < 0) {
2809 ERR("Kernel create metadata stream failed");
2810 ret = LTTCOMM_KERN_STREAM_FAIL;
2811 goto error;
2812 }
2813 }
2814
2815 /* For each channel */
2816 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2817 if (kchan->stream_count == 0) {
2818 ret = kernel_open_channel_stream(kchan);
2819 if (ret < 0) {
2820 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2821 goto error;
2822 }
54d01ffb
DG		 2823 /* Update the stream global counter */
2824 ksession->stream_count_global += ret;
7d29a247 2825 }
54d01ffb
DG		 2826 }
2827
2828 /* Setup kernel consumer socket and send fds to it */
2829 ret = init_kernel_tracing(ksession);
2830 if (ret < 0) {
2831 ret = LTTCOMM_KERN_START_FAIL;
2832 goto error;
2833 }
2834
2835 /* This start the kernel tracing */
2836 ret = kernel_start_session(ksession);
2837 if (ret < 0) {
2838 ret = LTTCOMM_KERN_START_FAIL;
2839 goto error;
2840 }
2841
2842 /* Quiescent wait after starting trace */
2843 kernel_wait_quiescent(kernel_tracer_fd);
2844 }
2845
36dc12cc 2846 /* Flag session that trace should start automatically */
b9d9b220
DG		 2847 if (usess) {
2848 usess->start_trace = 1;
36dc12cc 2849
b9d9b220
DG		 2850 ret = ust_app_start_trace_all(usess);
2851 if (ret < 0) {
2852 ret = LTTCOMM_UST_START_FAIL;
2853 goto error;
2854 }
2bdd86d4 2855 }
54d01ffb
DG		 2856
2857 ret = LTTCOMM_OK;
2858
2859error:
2860 return ret;
2861}
2862
2863/*
2864 * Command LTTNG_STOP_TRACE processed by the client thread.
2865 */
2866static int cmd_stop_trace(struct ltt_session *session)
2867{
2868 int ret;
2869 struct ltt_kernel_channel *kchan;
2870 struct ltt_kernel_session *ksession;
8be98f9a 2871 struct ltt_ust_session *usess;
54d01ffb
DG		 2872
2873 /* Short cut */
2874 ksession = session->kernel_session;
8be98f9a 2875 usess = session->ust_session;
54d01ffb 2876
b9ef1c83
DG		 2877 if (!session->enabled) {
2878 ret = LTTCOMM_UST_START_FAIL;
2879 goto error;
2880 }
2881
464dd62d
MD		 2882 session->enabled = 0;
2883
54d01ffb
DG		 2884 /* Kernel tracer */
2885 if (ksession != NULL) {
2886 DBG("Stop kernel tracing");
2887
2888 /* Flush all buffers before stopping */
2889 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2890 if (ret < 0) {
2891 ERR("Kernel metadata flush failed");
2892 }
f34daff7 2893
54d01ffb
DG		 2894 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2895 ret = kernel_flush_buffer(kchan);
0d0c377a 2896 if (ret < 0) {
54d01ffb 2897 ERR("Kernel flush buffer error");
7d29a247 2898 }
54d01ffb 2899 }
19e70852 2900
54d01ffb
DG		 2901 ret = kernel_stop_session(ksession);
2902 if (ret < 0) {
2903 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2904 goto error;
f3ed775e 2905 }
54d01ffb
DG		 2906
2907 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2908 }
54d01ffb 2909
8be98f9a
MD		 2910 if (usess) {
2911 usess->start_trace = 0;
2bdd86d4 2912
8be98f9a 2913 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2914 if (ret < 0) {
8be98f9a 2915 ret = LTTCOMM_UST_START_FAIL;
2bdd86d4
MD		 2916 goto error;
2917 }
2bdd86d4 2918 }
54d01ffb
DG		 2919
2920 ret = LTTCOMM_OK;
2921
2922error:
2923 return ret;
2924}
2925
2926/*
2927 * Command LTTNG_CREATE_SESSION processed by the client thread.
2928 */
6df2e2c9 2929static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG		 2930{
2931 int ret;
2932
6df2e2c9 2933 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG		 2934 if (ret != LTTCOMM_OK) {
2935 goto error;
2936 }
2937
2938 ret = LTTCOMM_OK;
2939
2940error:
2941 return ret;
2942}
2943
2944/*
2945 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2946 */
2947static int cmd_destroy_session(struct ltt_session *session, char *name)
2948{
2949 int ret;
2950
2951 /* Clean kernel session teardown */
2952 teardown_kernel_session(session);
84cd17c6
MD		 2953 /* UST session teardown */
2954 teardown_ust_session(session);
54d01ffb
DG		 2955
2956 /*
2957 * Must notify the kernel thread here to update it's poll setin order
2958 * to remove the channel(s)' fd just destroyed.
2959 */
2960 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2961 if (ret < 0) {
2962 perror("write kernel poll pipe");
2963 }
2964
271933a4 2965 ret = session_destroy(session);
54d01ffb
DG		 2966
2967 return ret;
2968}
2969
2970/*
2971 * Command LTTNG_CALIBRATE processed by the client thread.
2972 */
2973static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2974{
2975 int ret;
2976
2977 switch (domain) {
2978 case LTTNG_DOMAIN_KERNEL:
33a2b854 2979 {
54d01ffb 2980 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2981
54d01ffb
DG		 2982 kcalibrate.type = calibrate->type;
2983 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2984 if (ret < 0) {
54d01ffb
DG		 2985 ret = LTTCOMM_KERN_ENABLE_FAIL;
2986 goto error;
33a2b854 2987 }
54d01ffb
DG		 2988 break;
2989 }
2990 default:
2991 /* TODO: Userspace tracing */
2992 ret = LTTCOMM_NOT_IMPLEMENTED;
2993 goto error;
2994 }
33a2b854 2995
54d01ffb 2996 ret = LTTCOMM_OK;
33a2b854 2997
54d01ffb
DG		 2998error:
2999 return ret;
3000}
7d29a247 3001
54d01ffb
DG		 3002/*
3003 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3004 */
3005static int cmd_register_consumer(struct ltt_session *session, int domain,
3006 char *sock_path)
3007{
3008 int ret, sock;
b389abbe 3009
54d01ffb
DG		 3010 switch (domain) {
3011 case LTTNG_DOMAIN_KERNEL:
3012 /* Can't register a consumer if there is already one */
48c4f28c 3013 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 3014 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3015 goto error;
3016 }
3017
3018 sock = lttcomm_connect_unix_sock(sock_path);
3019 if (sock < 0) {
3020 ret = LTTCOMM_CONNECT_FAIL;
3021 goto error;
3022 }
3023
3024 session->kernel_session->consumer_fd = sock;
3025 break;
3026 default:
3027 /* TODO: Userspace tracing */
3028 ret = LTTCOMM_NOT_IMPLEMENTED;
3029 goto error;
3030 }
3031
3032 ret = LTTCOMM_OK;
3033
3034error:
3035 return ret;
3036}
3037
3038/*
3039 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3040 */
3041static ssize_t cmd_list_domains(struct ltt_session *session,
3042 struct lttng_domain **domains)
3043{
b551a063 3044 int ret, index = 0;
54d01ffb
DG		 3045 ssize_t nb_dom = 0;
3046
3047 if (session->kernel_session != NULL) {
b551a063 3048 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3049 nb_dom++;
3050 }
3051
b551a063
DG		 3052 if (session->ust_session != NULL) {
3053 DBG3("Listing domains found UST global domain");
3054 nb_dom++;
3055 }
54d01ffb 3056
b551a063 3057 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3058 if (*domains == NULL) {
3059 ret = -LTTCOMM_FATAL;
3060 goto error;
3061 }
3062
b551a063
DG		 3063 if (session->kernel_session != NULL) {
3064 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3065 index++;
3066 }
3067
3068 if (session->ust_session != NULL) {
3069 (*domains)[index].type = LTTNG_DOMAIN_UST;
3070 index++;
3071 }
54d01ffb 3072
54d01ffb
DG		 3073 return nb_dom;
3074
3075error:
3076 return ret;
3077}
3078
3079/*
3080 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3081 */
b551a063 3082static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3083 struct lttng_channel **channels)
3084{
3085 int ret;
3086 ssize_t nb_chan = 0;
3087
b551a063
DG		 3088 switch (domain) {
3089 case LTTNG_DOMAIN_KERNEL:
3090 if (session->kernel_session != NULL) {
3091 nb_chan = session->kernel_session->channel_count;
3092 }
0df502fd 3093 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3094 break;
3095 case LTTNG_DOMAIN_UST:
3096 if (session->ust_session != NULL) {
3097 nb_chan = hashtable_get_count(
3098 session->ust_session->domain_global.channels);
3099 }
0df502fd 3100 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3101 break;
3102 default:
3103 *channels = NULL;
3104 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3105 goto error;
3106 }
3107
b551a063
DG		 3108 if (nb_chan > 0) {
3109 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3110 if (*channels == NULL) {
3111 ret = -LTTCOMM_FATAL;
3112 goto error;
3113 }
54d01ffb 3114
b551a063
DG		 3115 list_lttng_channels(domain, session, *channels);
3116 } else {
3117 *channels = NULL;
3118 }
2bdd86d4 3119
54d01ffb
DG		 3120 return nb_chan;
3121
3122error:
3123 return ret;
3124}
3125
3126/*
3127 * Command LTTNG_LIST_EVENTS processed by the client thread.
3128 */
b551a063 3129static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3130 char *channel_name, struct lttng_event **events)
3131{
b551a063 3132 int ret = 0;
54d01ffb 3133 ssize_t nb_event = 0;
54d01ffb 3134
b551a063
DG		 3135 switch (domain) {
3136 case LTTNG_DOMAIN_KERNEL:
3137 if (session->kernel_session != NULL) {
3138 nb_event = list_lttng_kernel_events(channel_name,
3139 session->kernel_session, events);
54d01ffb 3140 }
b551a063
DG		 3141 break;
3142 case LTTNG_DOMAIN_UST:
3143 {
3144 if (session->ust_session != NULL) {
3145 nb_event = list_lttng_ust_global_events(channel_name,
3146 &session->ust_session->domain_global, events);
3147 }
3148 break;
54d01ffb 3149 }
b551a063
DG		 3150 default:
3151 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3152 goto error;
3153 }
3154
b551a063 3155 ret = nb_event;
54d01ffb
DG		 3156
3157error:
3158 return ret;
3159}
3160
3161/*
3162 * Process the command requested by the lttng client within the command
3163 * context structure. This function make sure that the return structure (llm)
3164 * is set and ready for transmission before returning.
3165 *
3166 * Return any error encountered or 0 for success.
3167 */
3168static int process_client_msg(struct command_ctx *cmd_ctx)
3169{
3170 int ret = LTTCOMM_OK;
44d3bd01 3171 int need_tracing_session = 1;
54d01ffb
DG		 3172
3173 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3174
4fba7219
DG		 3175 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3176 ret = LTTCOMM_KERN_NA;
3177 goto error;
3178 }
3179
54d01ffb
DG		 3180 /*
3181 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3182 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3183 * command.
3184 */
3185 switch(cmd_ctx->lsm->cmd_type) {
3186 case LTTNG_LIST_SESSIONS:
3187 case LTTNG_LIST_TRACEPOINTS:
3188 case LTTNG_LIST_DOMAINS:
3189 case LTTNG_LIST_CHANNELS:
3190 case LTTNG_LIST_EVENTS:
3191 break;
3192 default:
3193 /* Setup lttng message with no payload */
3194 ret = setup_lttng_msg(cmd_ctx, 0);
3195 if (ret < 0) {
3196 /* This label does not try to unlock the session */
3197 goto init_setup_error;
3198 }
3199 }
3200
3201 /* Commands that DO NOT need a session. */
3202 switch (cmd_ctx->lsm->cmd_type) {
3203 case LTTNG_CALIBRATE:
3204 case LTTNG_CREATE_SESSION:
3205 case LTTNG_LIST_SESSIONS:
3206 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3207 need_tracing_session = 0;
54d01ffb
DG		 3208 break;
3209 default:
3210 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3211 session_lock_list();
54d01ffb 3212 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3213 session_unlock_list();
54d01ffb
DG		 3214 if (cmd_ctx->session == NULL) {
3215 if (cmd_ctx->lsm->session.name != NULL) {
3216 ret = LTTCOMM_SESS_NOT_FOUND;
3217 } else {
3218 /* If no session name specified */
3219 ret = LTTCOMM_SELECT_SESS;
3220 }
3221 goto error;
3222 } else {
3223 /* Acquire lock for the session */
3224 session_lock(cmd_ctx->session);
3225 }
3226 break;
3227 }
b389abbe 3228
54d01ffb
DG		 3229 /*
3230 * Check domain type for specific "pre-action".
3231 */
3232 switch (cmd_ctx->lsm->domain.type) {
3233 case LTTNG_DOMAIN_KERNEL:
3234 /* Kernel tracer check */
3235 if (kernel_tracer_fd == 0) {
3236 /* Basically, load kernel tracer modules */
3237 init_kernel_tracer();
3238 if (kernel_tracer_fd == 0) {
3239 ret = LTTCOMM_KERN_NA;
3240 goto error;
3241 }
3242 }
5eb91c98 3243
54d01ffb 3244 /* Need a session for kernel command */
44d3bd01 3245 if (need_tracing_session) {
54d01ffb 3246 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 3247 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3248 if (ret < 0) {
54d01ffb 3249 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3250 goto error;
3251 }
b389abbe 3252 }
7d29a247 3253
54d01ffb 3254 /* Start the kernel consumer daemon */
3bd1e081
MD		 3255 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3256 if (kconsumer_data.pid == 0 &&
54d01ffb 3257 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3258 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3259 ret = start_consumerd(&kconsumer_data);
7d29a247 3260 if (ret < 0) {
54d01ffb
DG		 3261 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3262 goto error;
950131af 3263 }
3ff2ecac
MD		 3264 } else {
3265 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3266 }
0d0c377a 3267 }
54d01ffb 3268 break;
2bdd86d4 3269 case LTTNG_DOMAIN_UST:
44d3bd01 3270 {
44d3bd01 3271 if (need_tracing_session) {
f6a9efaa 3272 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3273 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3274 &cmd_ctx->lsm->domain);
44d3bd01
DG		 3275 if (ret != LTTCOMM_OK) {
3276 goto error;
3277 }
3278 }
7753dea8
MD		 3279 /* Start the UST consumer daemons */
3280 /* 64-bit */
3281 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3282 if (consumerd64_bin[0] != '\0' &&
7753dea8 3283 ustconsumer64_data.pid == 0 &&
2bdd86d4 3284 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3285 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3286 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3287 if (ret < 0) {
7753dea8
MD		 3288 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3289 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3290 goto error;
3291 }
48842b30 3292
7753dea8 3293 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3294 } else {
7753dea8
MD		 3295 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3296 }
3297 /* 32-bit */
fc7a59ce 3298 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3299 ustconsumer32_data.pid == 0 &&
3300 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3301 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3302 ret = start_consumerd(&ustconsumer32_data);
3303 if (ret < 0) {
3304 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3305 ust_consumerd32_fd = -EINVAL;
3306 goto error;
3307 }
3308 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3309 } else {
3310 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3311 }
44d3bd01
DG		 3312 }
3313 break;
48842b30 3314 }
54d01ffb 3315 default:
54d01ffb
DG		 3316 break;
3317 }
33a2b854 3318
54d01ffb
DG		 3319 /* Process by command type */
3320 switch (cmd_ctx->lsm->cmd_type) {
3321 case LTTNG_ADD_CONTEXT:
3322 {
3323 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3324 cmd_ctx->lsm->u.context.channel_name,
3325 cmd_ctx->lsm->u.context.event_name,
3326 &cmd_ctx->lsm->u.context.ctx);
3327 break;
3328 }
3329 case LTTNG_DISABLE_CHANNEL:
3330 {
3331 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3332 cmd_ctx->lsm->u.disable.channel_name);
3333 break;
3334 }
3335 case LTTNG_DISABLE_EVENT:
3336 {
3337 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3338 cmd_ctx->lsm->u.disable.channel_name,
3339 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3340 ret = LTTCOMM_OK;
3341 break;
3342 }
54d01ffb
DG		 3343 case LTTNG_DISABLE_ALL_EVENT:
3344 {
2bdd86d4 3345 DBG("Disabling all events");
54d01ffb
DG		 3346
3347 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3348 cmd_ctx->lsm->u.disable.channel_name);
3349 break;
3350 }
3351 case LTTNG_ENABLE_CHANNEL:
3352 {
aea829b3 3353 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3354 &cmd_ctx->lsm->u.channel.chan);
3355 break;
3356 }
3357 case LTTNG_ENABLE_EVENT:
3358 {
3359 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3360 cmd_ctx->lsm->u.enable.channel_name,
3361 &cmd_ctx->lsm->u.enable.event);
3362 break;
3363 }
3364 case LTTNG_ENABLE_ALL_EVENT:
3365 {
2bdd86d4 3366 DBG("Enabling all events");
54d01ffb
DG		 3367
3368 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3369 cmd_ctx->lsm->u.enable.channel_name,
3370 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3371 break;
3372 }
052da939 3373 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3374 {
9f19cc17 3375 struct lttng_event *events;
54d01ffb 3376 ssize_t nb_events;
052da939 3377
54d01ffb
DG		 3378 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3379 if (nb_events < 0) {
3380 ret = -nb_events;
3381 goto error;
2ef84c95
DG		 3382 }
3383
3384 /*
3385 * Setup lttng message with payload size set to the event list size in
3386 * bytes and then copy list into the llm payload.
3387 */
052da939 3388 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3389 if (ret < 0) {
052da939 3390 free(events);
2ef84c95
DG		 3391 goto setup_error;
3392 }
3393
3394 /* Copy event list into message payload */
9f19cc17 3395 memcpy(cmd_ctx->llm->payload, events,
052da939 3396 sizeof(struct lttng_event) * nb_events);
2ef84c95 3397
9f19cc17 3398 free(events);
2ef84c95
DG		 3399
3400 ret = LTTCOMM_OK;
3401 break;
3402 }
f3ed775e 3403 case LTTNG_START_TRACE:
8c0faa1d 3404 {
54d01ffb 3405 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3406 break;
3407 }
f3ed775e 3408 case LTTNG_STOP_TRACE:
8c0faa1d 3409 {
54d01ffb 3410 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3411 break;
3412 }
5e16da05
MD		 3413 case LTTNG_CREATE_SESSION:
3414 {
54d01ffb 3415 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3416 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
5e16da05
MD		 3417 break;
3418 }
3419 case LTTNG_DESTROY_SESSION:
3420 {
54d01ffb
DG		 3421 ret = cmd_destroy_session(cmd_ctx->session,
3422 cmd_ctx->lsm->session.name);
5461b305 3423 break;
5e16da05 3424 }
9f19cc17 3425 case LTTNG_LIST_DOMAINS:
5e16da05 3426 {
54d01ffb
DG		 3427 ssize_t nb_dom;
3428 struct lttng_domain *domains;
5461b305 3429
54d01ffb
DG		 3430 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3431 if (nb_dom < 0) {
3432 ret = -nb_dom;
3433 goto error;
ce3d728c 3434 }
520ff687 3435
54d01ffb 3436 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3437 if (ret < 0) {
3438 goto setup_error;
520ff687 3439 }
57167058 3440
54d01ffb
DG		 3441 /* Copy event list into message payload */
3442 memcpy(cmd_ctx->llm->payload, domains,
3443 nb_dom * sizeof(struct lttng_domain));
3444
3445 free(domains);
5e16da05 3446
5461b305 3447 ret = LTTCOMM_OK;
5e16da05
MD		 3448 break;
3449 }
9f19cc17 3450 case LTTNG_LIST_CHANNELS:
5e16da05 3451 {
54d01ffb
DG		 3452 size_t nb_chan;
3453 struct lttng_channel *channels;
3454
b551a063
DG		 3455 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3456 cmd_ctx->session, &channels);
54d01ffb
DG		 3457 if (nb_chan < 0) {
3458 ret = -nb_chan;
3459 goto error;
5461b305 3460 }
ca95a216 3461
54d01ffb 3462 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3463 if (ret < 0) {
3464 goto setup_error;
3465 }
9f19cc17 3466
54d01ffb
DG		 3467 /* Copy event list into message payload */
3468 memcpy(cmd_ctx->llm->payload, channels,
3469 nb_chan * sizeof(struct lttng_channel));
3470
3471 free(channels);
9f19cc17
DG		 3472
3473 ret = LTTCOMM_OK;
5461b305 3474 break;
5e16da05 3475 }
9f19cc17 3476 case LTTNG_LIST_EVENTS:
5e16da05 3477 {
b551a063 3478 ssize_t nb_event;
684d34d2 3479 struct lttng_event *events = NULL;
9f19cc17 3480
b551a063 3481 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3482 cmd_ctx->lsm->u.list.channel_name, &events);
3483 if (nb_event < 0) {
3484 ret = -nb_event;
3485 goto error;
5461b305 3486 }
ca95a216 3487
54d01ffb 3488 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3489 if (ret < 0) {
3490 goto setup_error;
3491 }
9f19cc17 3492
54d01ffb
DG		 3493 /* Copy event list into message payload */
3494 memcpy(cmd_ctx->llm->payload, events,
3495 nb_event * sizeof(struct lttng_event));
9f19cc17 3496
54d01ffb 3497 free(events);
9f19cc17
DG		 3498
3499 ret = LTTCOMM_OK;
5461b305 3500 break;
5e16da05
MD		 3501 }
3502 case LTTNG_LIST_SESSIONS:
3503 {
54d01ffb 3504 session_lock_list();
5461b305 3505
6c9cc2ab 3506 if (session_list_ptr->count == 0) {
f3ed775e 3507 ret = LTTCOMM_NO_SESSION;
54d01ffb 3508 session_unlock_list();
5461b305 3509 goto error;
57167058 3510 }
5e16da05 3511
6c9cc2ab
DG		 3512 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3513 session_list_ptr->count);
5461b305 3514 if (ret < 0) {
54d01ffb 3515 session_unlock_list();
5461b305 3516 goto setup_error;
e065084a 3517 }
5e16da05 3518
6c9cc2ab
DG		 3519 /* Filled the session array */
3520 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3521
54d01ffb 3522 session_unlock_list();
5e16da05 3523
5461b305 3524 ret = LTTCOMM_OK;
5e16da05
MD		 3525 break;
3526 }
d0254c7c
MD		 3527 case LTTNG_CALIBRATE:
3528 {
54d01ffb
DG		 3529 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3530 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3531 break;
3532 }
d9800920
DG		 3533 case LTTNG_REGISTER_CONSUMER:
3534 {
54d01ffb
DG		 3535 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3536 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3537 break;
3538 }
5e16da05 3539 default:
5e16da05 3540 ret = LTTCOMM_UND;
5461b305 3541 break;
fac6795d
DG		 3542 }
3543
5461b305 3544error:
5461b305
DG		 3545 if (cmd_ctx->llm == NULL) {
3546 DBG("Missing llm structure. Allocating one.");
894be886 3547 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3548 goto setup_error;
3549 }
3550 }
54d01ffb 3551 /* Set return code */
5461b305 3552 cmd_ctx->llm->ret_code = ret;
5461b305 3553setup_error:
b5541356 3554 if (cmd_ctx->session) {
54d01ffb 3555 session_unlock(cmd_ctx->session);
b5541356 3556 }
54d01ffb 3557init_setup_error:
8028d920 3558 return ret;
fac6795d
DG		 3559}
3560
1d4b027a 3561/*
d063d709
DG		 3562 * This thread manage all clients request using the unix client socket for
3563 * communication.
1d4b027a
DG		 3564 */
3565static void *thread_manage_clients(void *data)
3566{
5eb91c98
DG		 3567 int sock = 0, ret, i, pollfd;
3568 uint32_t revents, nb_fd;
273ea72c 3569 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3570 struct lttng_poll_event events;
1d4b027a
DG		 3571
3572 DBG("[thread] Manage client started");
3573
f6a9efaa
DG		 3574 rcu_register_thread();
3575
1d4b027a
DG		 3576 ret = lttcomm_listen_unix_sock(client_sock);
3577 if (ret < 0) {
3578 goto error;
3579 }
3580
5eb91c98
DG		 3581 /*
3582 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3583 * more will be added to this poll set.
3584 */
3585 ret = create_thread_poll_set(&events, 2);
3586 if (ret < 0) {
3587 goto error;
3588 }
273ea72c 3589
5eb91c98
DG		 3590 /* Add the application registration socket */
3591 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3592 if (ret < 0) {
3593 goto error;
3594 }
273ea72c 3595
bbd973c2
DG		 3596 /*
3597 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3598 */
3599 if (opt_sig_parent) {
3600 kill(ppid, SIGCHLD);
3601 }
3602
3603 while (1) {
1d4b027a 3604 DBG("Accepting client command ...");
273ea72c 3605
5eb91c98
DG		 3606 nb_fd = LTTNG_POLL_GETNB(&events);
3607
273ea72c 3608 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3609 ret = lttng_poll_wait(&events, -1);
273ea72c 3610 if (ret < 0) {
273ea72c
DG		 3611 goto error;
3612 }
3613
5eb91c98
DG		 3614 for (i = 0; i < nb_fd; i++) {
3615 /* Fetch once the poll data */
3616 revents = LTTNG_POLL_GETEV(&events, i);
3617 pollfd = LTTNG_POLL_GETFD(&events, i);
3618
3619 /* Thread quit pipe has been closed. Killing thread. */
3620 ret = check_thread_quit_pipe(pollfd, revents);
3621 if (ret) {
3622 goto error;
3623 }
3624
3625 /* Event on the registration socket */
3626 if (pollfd == client_sock) {
3627 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3628 ERR("Client socket poll error");
3629 goto error;
3630 }
3631 }
3632 }
3633
3634 DBG("Wait for client response");
3635
3636 sock = lttcomm_accept_unix_sock(client_sock);
3637 if (sock < 0) {
273ea72c 3638 goto error;
273ea72c
DG		 3639 }
3640
be040666
DG		 3641 /* Set socket option for credentials retrieval */
3642 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3643 if (ret < 0) {
3644 goto error;
3645 }
3646
5eb91c98 3647 /* Allocate context command to process the client request */
ba7f0ae5 3648 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3649 if (cmd_ctx == NULL) {
ba7f0ae5 3650 perror("zmalloc cmd_ctx");
1d4b027a 3651 goto error;
5eb91c98 3652 }
1d4b027a 3653
5eb91c98 3654 /* Allocate data buffer for reception */
ba7f0ae5 3655 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3656 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3657 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3658 goto error;
3659 }
1d4b027a 3660
5eb91c98
DG		 3661 cmd_ctx->llm = NULL;
3662 cmd_ctx->session = NULL;
1d4b027a 3663
5eb91c98
DG		 3664 /*
3665 * Data is received from the lttng client. The struct
3666 * lttcomm_session_msg (lsm) contains the command and data request of
3667 * the client.
3668 */
3669 DBG("Receiving data from client ...");
be040666
DG		 3670 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3671 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG		 3672 if (ret <= 0) {
3673 DBG("Nothing recv() from client... continuing");
3674 close(sock);
3675 free(cmd_ctx);
3676 continue;
3677 }
1d4b027a 3678
5eb91c98
DG		 3679 // TODO: Validate cmd_ctx including sanity check for
3680 // security purpose.
f7776ea7 3681
f6a9efaa 3682 rcu_thread_online();
5eb91c98
DG		 3683 /*
3684 * This function dispatch the work to the kernel or userspace tracer
3685 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3686 * informations for the client. The command context struct contains
3687 * everything this function may needs.
3688 */
3689 ret = process_client_msg(cmd_ctx);
f6a9efaa 3690 rcu_thread_offline();
5eb91c98 3691 if (ret < 0) {
bbd973c2 3692 /*
5eb91c98 3693 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3694 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3695 * (ENOMEM). Error detected but still accept command.
bbd973c2 3696 */
bbd973c2 3697 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3698 continue;
3699 }
d6e4fca4 3700
54d01ffb
DG		 3701 DBG("Sending response (size: %d, retcode: %s)",
3702 cmd_ctx->lttng_msg_size,
9a745bc7 3703 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3704 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3705 if (ret < 0) {
3706 ERR("Failed to send data back to client");
bbd973c2 3707 }
1d4b027a 3708
5eb91c98 3709 /* End of transmission */
273ea72c 3710 close(sock);
be040666
DG		 3711
3712 clean_command_ctx(&cmd_ctx);
273ea72c
DG		 3713 }
3714
5eb91c98
DG		 3715error:
3716 DBG("Client thread dying");
273ea72c 3717 unlink(client_unix_sock_path);
5eb91c98
DG		 3718 close(client_sock);
3719 close(sock);
273ea72c 3720
5eb91c98 3721 lttng_poll_clean(&events);
a2fb29a5 3722 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3723
3724 rcu_unregister_thread();
1d4b027a
DG		 3725 return NULL;
3726}
3727
3728
fac6795d
DG		 3729/*
3730 * usage function on stderr
3731 */
3732static void usage(void)
3733{
b716ce68 3734 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3735 fprintf(stderr, " -h, --help Display this usage.\n");
3736 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3737 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3738 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3739 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3740 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3741 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3742 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3743 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3744 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3745 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3746 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3747 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3748 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3749 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3750 fprintf(stderr, " -V, --version Show version number.\n");
3751 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3752 fprintf(stderr, " -q, --quiet No output at all.\n");
3753 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3754 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3755 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3756}
3757
3758/*
3759 * daemon argument parsing
3760 */
3761static int parse_args(int argc, char **argv)
3762{
3763 int c;
3764
3765 static struct option long_options[] = {
3766 { "client-sock", 1, 0, 'c' },
3767 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3768 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3769 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3770 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3771 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3772 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3773 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3774 { "consumerd32-path", 1, 0, 'u' },
3775 { "consumerd32-libdir", 1, 0, 'U' },
3776 { "consumerd64-path", 1, 0, 't' },
3777 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3778 { "daemonize", 0, 0, 'd' },
5b8719f5 3779 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3780 { "help", 0, 0, 'h' },
3781 { "group", 1, 0, 'g' },
3782 { "version", 0, 0, 'V' },
75462a81 3783 { "quiet", 0, 0, 'q' },
3f9947db 3784 { "verbose", 0, 0, 'v' },
3bd1e081 3785 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3786 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3787 { NULL, 0, 0, 0 }
3788 };
3789
3790 while (1) {
3791 int option_index = 0;
4fba7219 3792 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3793 long_options, &option_index);
fac6795d
DG		 3794 if (c == -1) {
3795 break;
3796 }
3797
3798 switch (c) {
3799 case 0:
3800 fprintf(stderr, "option %s", long_options[option_index].name);
3801 if (optarg) {
3802 fprintf(stderr, " with arg %s\n", optarg);
3803 }
3804 break;
b716ce68 3805 case 'c':
fac6795d
DG		 3806 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3807 break;
3808 case 'a':
3809 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3810 break;
3811 case 'd':
3812 opt_daemon = 1;
3813 break;
3814 case 'g':
fb09408a 3815 opt_tracing_group = optarg;
fac6795d
DG		 3816 break;
3817 case 'h':
3818 usage();
3819 exit(EXIT_FAILURE);
3820 case 'V':
3821 fprintf(stdout, "%s\n", VERSION);
3822 exit(EXIT_SUCCESS);
5b8719f5
DG		 3823 case 'S':
3824 opt_sig_parent = 1;
3825 break;
d6f42150 3826 case 'E':
3bd1e081 3827 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3828 break;
3829 case 'C':
3bd1e081
MD		 3830 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3831 break;
3832 case 'F':
7753dea8 3833 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3834 break;
3835 case 'D':
7753dea8
MD		 3836 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3837 break;
3838 case 'H':
3839 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3840 break;
3841 case 'G':
3842 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3843 break;
4fba7219
DG		 3844 case 'N':
3845 opt_no_kernel = 1;
3846 break;
75462a81
DG		 3847 case 'q':
3848 opt_quiet = 1;
3849 break;
3f9947db 3850 case 'v':
53086306
DG		 3851 /* Verbose level can increase using multiple -v */
3852 opt_verbose += 1;
3f9947db 3853 break;
31f73cc9 3854 case 'Z':
3bd1e081 3855 opt_verbose_consumer += 1;
31f73cc9 3856 break;
fb09408a 3857 case 'u':
fc7a59ce 3858 consumerd32_bin= optarg;
ebaeda94
MD		 3859 break;
3860 case 'U':
3861 consumerd32_libdir = optarg;
7753dea8
MD		 3862 break;
3863 case 't':
fc7a59ce 3864 consumerd64_bin = optarg;
ebaeda94
MD		 3865 break;
3866 case 'T':
3867 consumerd64_libdir = optarg;
fb09408a 3868 break;
fac6795d
DG		 3869 default:
3870 /* Unknown option or other error.
3871 * Error is printed by getopt, just return */
3872 return -1;
3873 }
3874 }
3875
3876 return 0;
3877}
3878
3879/*
d063d709 3880 * Creates the two needed socket by the daemon.
d6f42150
DG		 3881 * apps_sock - The communication socket for all UST apps.
3882 * client_sock - The communication of the cli tool (lttng).
fac6795d 3883 */
cf3af59e 3884static int init_daemon_socket(void)
fac6795d
DG		 3885{
3886 int ret = 0;
3887 mode_t old_umask;
3888
3889 old_umask = umask(0);
3890
3891 /* Create client tool unix socket */
d6f42150
DG		 3892 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3893 if (client_sock < 0) {
3894 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3895 ret = -1;
3896 goto end;
3897 }
3898
3899 /* File permission MUST be 660 */
3900 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3901 if (ret < 0) {
d6f42150 3902 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3903 perror("chmod");
3904 goto end;
3905 }
3906
3907 /* Create the application unix socket */
d6f42150
DG		 3908 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3909 if (apps_sock < 0) {
3910 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3911 ret = -1;
3912 goto end;
3913 }
3914
d6f42150 3915 /* File permission MUST be 666 */
54d01ffb
DG		 3916 ret = chmod(apps_unix_sock_path,
3917 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3918 if (ret < 0) {
d6f42150 3919 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3920 perror("chmod");
3921 goto end;
3922 }
3923
3924end:
3925 umask(old_umask);
3926 return ret;
3927}
3928
3929/*
54d01ffb
DG		 3930 * Check if the global socket is available, and if a daemon is answering at the
3931 * other side. If yes, error is returned.
fac6795d 3932 */
cf3af59e 3933static int check_existing_daemon(void)
fac6795d 3934{
7d8234d9 3935 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 3936 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 3937 return 0;
099e26bd 3938 }
54d01ffb 3939
7d8234d9 3940 /* Is there anybody out there ? */
099e26bd 3941 if (lttng_session_daemon_alive()) {
7d8234d9 3942 return -EEXIST;
099e26bd 3943 } else {
7d8234d9 3944 return 0;
099e26bd 3945 }
fac6795d
DG		 3946}
3947
fac6795d 3948/*
d063d709 3949 * Set the tracing group gid onto the client socket.
5e16da05 3950 *
d063d709
DG		 3951 * Race window between mkdir and chown is OK because we are going from more
3952 * permissive (root.root) to les permissive (root.tracing).
fac6795d 3953 */
be040666 3954static int set_permissions(char *rundir)
fac6795d
DG		 3955{
3956 int ret;
996b65c8 3957 gid_t gid;
fac6795d 3958
996b65c8
MD		 3959 gid = allowed_group();
3960 if (gid < 0) {
be040666
DG		 3961 WARN("No tracing group detected");
3962 ret = 0;
fac6795d
DG		 3963 goto end;
3964 }
3965
d6f42150 3966 /* Set lttng run dir */
be040666 3967 ret = chown(rundir, 0, gid);
d6f42150 3968 if (ret < 0) {
be040666 3969 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 3970 perror("chown");
3971 }
3972
3973 /* lttng client socket path */
996b65c8 3974 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3975 if (ret < 0) {
d6f42150
DG		 3976 ERR("Unable to set group on %s", client_unix_sock_path);
3977 perror("chown");
3978 }
3979
3bd1e081
MD		 3980 /* kconsumer error socket path */
3981 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 3982 if (ret < 0) {
3bd1e081
MD		 3983 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3984 perror("chown");
3985 }
3986
7753dea8
MD		 3987 /* 64-bit ustconsumer error socket path */
3988 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3989 if (ret < 0) {
3990 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3991 perror("chown");
3992 }
3993
3994 /* 32-bit ustconsumer compat32 error socket path */
3995 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 3996 if (ret < 0) {
7753dea8 3997 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 3998 perror("chown");
3999 }
4000
d6f42150 4001 DBG("All permissions are set");
e07ae692 4002
fac6795d
DG		 4003end:
4004 return ret;
4005}
4006
7a485870 4007/*
d063d709 4008 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 4009 */
4010static int create_kernel_poll_pipe(void)
4011{
4012 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4013}
4014
099e26bd
DG		 4015/*
4016 * Create the application command pipe to wake thread_manage_apps.
4017 */
4018static int create_apps_cmd_pipe(void)
4019{
4020 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4021}
4022
d6f42150 4023/*
d063d709 4024 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4025 */
67e40797 4026static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 4027{
4028 int ret;
4029
67e40797
DG		 4030 DBG3("Creating LTTng run directory: %s", rundir);
4031
4032 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
d6f42150 4033 if (ret < 0) {
b1f11e69 4034 if (errno != EEXIST) {
67e40797 4035 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4036 goto error;
4037 } else {
4038 ret = 0;
4039 }
d6f42150
DG		 4040 }
4041
4042error:
4043 return ret;
4044}
4045
4046/*
d063d709
DG		 4047 * Setup sockets and directory needed by the kconsumerd communication with the
4048 * session daemon.
d6f42150 4049 */
67e40797
DG		 4050static int set_consumer_sockets(struct consumer_data *consumer_data,
4051 const char *rundir)
d6f42150
DG		 4052{
4053 int ret;
67e40797 4054 char path[PATH_MAX];
d6f42150 4055
67e40797 4056 switch (consumer_data->type) {
7753dea8 4057 case LTTNG_CONSUMER_KERNEL:
67e40797 4058 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
7753dea8
MD		 4059 break;
4060 case LTTNG_CONSUMER64_UST:
67e40797 4061 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4062 break;
4063 case LTTNG_CONSUMER32_UST:
67e40797 4064 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4065 break;
4066 default:
4067 ERR("Consumer type unknown");
4068 ret = -EINVAL;
4069 goto error;
d6f42150
DG		 4070 }
4071
67e40797
DG		 4072 DBG2("Creating consumer directory: %s", path);
4073
3bd1e081 4074 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4075 if (ret < 0) {
6beb2242 4076 if (errno != EEXIST) {
3bd1e081 4077 ERR("Failed to create %s", path);
6beb2242
DG		 4078 goto error;
4079 }
4080 ret = 0;
d6f42150
DG		 4081 }
4082
4083 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4084 consumer_data->err_sock =
4085 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4086 if (consumer_data->err_sock < 0) {
4087 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4088 ret = -1;
4089 goto error;
4090 }
4091
4092 /* File permission MUST be 660 */
3bd1e081 4093 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4094 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4095 if (ret < 0) {
3bd1e081 4096 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4097 PERROR("chmod");
d6f42150
DG		 4098 goto error;
4099 }
4100
4101error:
4102 return ret;
4103}
4104
fac6795d 4105/*
d063d709 4106 * Signal handler for the daemon
cf3af59e 4107 *
54d01ffb
DG		 4108 * Simply stop all worker threads, leaving main() return gracefully after
4109 * joining all threads and calling cleanup().
fac6795d
DG		 4110 */
4111static void sighandler(int sig)
4112{
4113 switch (sig) {
cf3af59e
MD		 4114 case SIGPIPE:
4115 DBG("SIGPIPE catched");
4116 return;
4117 case SIGINT:
4118 DBG("SIGINT catched");
4119 stop_threads();
4120 break;
4121 case SIGTERM:
4122 DBG("SIGTERM catched");
4123 stop_threads();
4124 break;
4125 default:
4126 break;
fac6795d 4127 }
fac6795d
DG		 4128}
4129
4130/*
d063d709 4131 * Setup signal handler for :
1d4b027a 4132 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4133 */
1d4b027a 4134static int set_signal_handler(void)
fac6795d 4135{
1d4b027a
DG		 4136 int ret = 0;
4137 struct sigaction sa;
4138 sigset_t sigset;
fac6795d 4139
1d4b027a
DG		 4140 if ((ret = sigemptyset(&sigset)) < 0) {
4141 perror("sigemptyset");
4142 return ret;
4143 }
d6f42150 4144
1d4b027a
DG		 4145 sa.sa_handler = sighandler;
4146 sa.sa_mask = sigset;
4147 sa.sa_flags = 0;
4148 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4149 perror("sigaction");
4150 return ret;
d6f42150
DG		 4151 }
4152
1d4b027a
DG		 4153 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4154 perror("sigaction");
4155 return ret;
d6f42150 4156 }
aaf26714 4157
1d4b027a
DG		 4158 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4159 perror("sigaction");
4160 return ret;
8c0faa1d
DG		 4161 }
4162
1d4b027a
DG		 4163 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4164
4165 return ret;
fac6795d
DG		 4166}
4167
f3ed775e 4168/*
d063d709
DG		 4169 * Set open files limit to unlimited. This daemon can open a large number of
4170 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4171 */
4172static void set_ulimit(void)
4173{
4174 int ret;
4175 struct rlimit lim;
4176
a88df331 4177 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4178 lim.rlim_cur = 65535;
4179 lim.rlim_max = 65535;
4180
4181 ret = setrlimit(RLIMIT_NOFILE, &lim);
4182 if (ret < 0) {
4183 perror("failed to set open files limit");
4184 }
4185}
4186
fac6795d
DG		 4187/*
4188 * main
4189 */
4190int main(int argc, char **argv)
4191{
fac6795d
DG		 4192 int ret = 0;
4193 void *status;
b082db07 4194 const char *home_path;
fac6795d 4195
f6a9efaa
DG		 4196 rcu_register_thread();
4197
273ea72c 4198 /* Create thread quit pipe */
cf3af59e
MD		 4199 if ((ret = init_thread_quit_pipe()) < 0) {
4200 goto error;
273ea72c
DG		 4201 }
4202
7753dea8 4203 setup_consumerd_path();
fb09408a 4204
fac6795d
DG		 4205 /* Parse arguments */
4206 progname = argv[0];
4207 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4208 goto error;
fac6795d
DG		 4209 }
4210
4211 /* Daemonize */
4212 if (opt_daemon) {
53094c05
DG		 4213 ret = daemon(0, 0);
4214 if (ret < 0) {
4215 perror("daemon");
cf3af59e 4216 goto error;
53094c05 4217 }
fac6795d
DG		 4218 }
4219
4220 /* Check if daemon is UID = 0 */
4221 is_root = !getuid();
4222
fac6795d 4223 if (is_root) {
67e40797
DG		 4224 rundir = strdup(LTTNG_RUNDIR);
4225
4226 /* Create global run dir with root access */
4227 ret = create_lttng_rundir(rundir);
d6f42150 4228 if (ret < 0) {
cf3af59e 4229 goto error;
d6f42150
DG		 4230 }
4231
fac6795d 4232 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4233 snprintf(apps_unix_sock_path, PATH_MAX,
4234 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4235 }
4236
4237 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4238 snprintf(client_unix_sock_path, PATH_MAX,
4239 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4240 }
0fdd1e2c
DG		 4241
4242 /* Set global SHM for ust */
4243 if (strlen(wait_shm_path) == 0) {
4244 snprintf(wait_shm_path, PATH_MAX,
4245 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4246 }
67e40797
DG		 4247
4248 /* Setup kernel consumerd path */
4249 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4250 KCONSUMERD_ERR_SOCK_PATH, rundir);
4251 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4252 KCONSUMERD_CMD_SOCK_PATH, rundir);
4253
4254 DBG2("Kernel consumer err path: %s",
4255 kconsumer_data.err_unix_sock_path);
4256 DBG2("Kernel consumer cmd path: %s",
4257 kconsumer_data.cmd_unix_sock_path);
fac6795d 4258 } else {
b082db07
DG		 4259 home_path = get_home_dir();
4260 if (home_path == NULL) {
273ea72c
DG		 4261 /* TODO: Add --socket PATH option */
4262 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4263 ret = -EPERM;
4264 goto error;
b082db07
DG		 4265 }
4266
67e40797
DG		 4267 /*
4268 * Create rundir from home path. This will create something like
4269 * $HOME/.lttng
4270 */
4271 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4272 if (ret < 0) {
4273 ret = -ENOMEM;
4274 goto error;
4275 }
4276
4277 ret = create_lttng_rundir(rundir);
4278 if (ret < 0) {
4279 goto error;
4280 }
4281
fac6795d 4282 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4283 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4284 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4285 }
4286
4287 /* Set the cli tool unix socket path */
4288 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4289 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4290 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4291 }
0fdd1e2c
DG		 4292
4293 /* Set global SHM for ust */
4294 if (strlen(wait_shm_path) == 0) {
4295 snprintf(wait_shm_path, PATH_MAX,
4296 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4297 }
fac6795d
DG		 4298 }
4299
847177cd
DG		 4300 DBG("Client socket path %s", client_unix_sock_path);
4301 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4302 DBG("LTTng run directory path: %s", rundir);
4303
4304 /* 32 bits consumerd path setup */
4305 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4306 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4307 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4308 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4309
4310 DBG2("UST consumer 32 bits err path: %s",
4311 ustconsumer32_data.err_unix_sock_path);
4312 DBG2("UST consumer 32 bits cmd path: %s",
4313 ustconsumer32_data.cmd_unix_sock_path);
4314
4315 /* 64 bits consumerd path setup */
4316 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4317 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4318 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4319 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4320
4321 DBG2("UST consumer 64 bits err path: %s",
4322 ustconsumer64_data.err_unix_sock_path);
4323 DBG2("UST consumer 64 bits cmd path: %s",
4324 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4325
273ea72c 4326 /*
7d8234d9 4327 * See if daemon already exist.
fac6795d 4328 */
7d8234d9 4329 if ((ret = check_existing_daemon()) < 0) {
75462a81 4330 ERR("Already running daemon.\n");
273ea72c 4331 /*
cf3af59e
MD		 4332 * We do not goto exit because we must not cleanup()
4333 * because a daemon is already running.
ab118b20 4334 */
cf3af59e 4335 goto error;
a88df331
DG		 4336 }
4337
54d01ffb 4338 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4339
4340 /*
4341 * These actions must be executed as root. We do that *after* setting up
4342 * the sockets path because we MUST make the check for another daemon using
4343 * those paths *before* trying to set the kernel consumer sockets and init
4344 * kernel tracer.
4345 */
4346 if (is_root) {
67e40797 4347 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4348 if (ret < 0) {
4349 goto exit;
4350 }
4351
a88df331 4352 /* Setup kernel tracer */
4fba7219
DG		 4353 if (!opt_no_kernel) {
4354 init_kernel_tracer();
4355 }
a88df331
DG		 4356
4357 /* Set ulimit for open files */
4358 set_ulimit();
fac6795d
DG		 4359 }
4360
67e40797
DG		 4361 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4362 if (ret < 0) {
4363 goto exit;
4364 }
4365
4366 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4367 if (ret < 0) {
4368 goto exit;
4369 }
4370
cf3af59e
MD		 4371 if ((ret = set_signal_handler()) < 0) {
4372 goto exit;
fac6795d
DG		 4373 }
4374
d6f42150 4375 /* Setup the needed unix socket */
cf3af59e
MD		 4376 if ((ret = init_daemon_socket()) < 0) {
4377 goto exit;
fac6795d
DG		 4378 }
4379
4380 /* Set credentials to socket */
be040666 4381 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4382 goto exit;
fac6795d
DG		 4383 }
4384
5b8719f5
DG		 4385 /* Get parent pid if -S, --sig-parent is specified. */
4386 if (opt_sig_parent) {
4387 ppid = getppid();
4388 }
4389
7a485870 4390 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4391 if ((ret = create_kernel_poll_pipe()) < 0) {
4392 goto exit;
7a485870
DG		 4393 }
4394
099e26bd
DG		 4395 /* Setup the thread apps communication pipe. */
4396 if ((ret = create_apps_cmd_pipe()) < 0) {
4397 goto exit;
4398 }
4399
4400 /* Init UST command queue. */
4401 cds_wfq_init(&ust_cmd_queue.queue);
4402
f6a9efaa
DG		 4403 /* Init UST app hash table */
4404 ust_app_ht_alloc();
4405
273ea72c 4406 /*
54d01ffb
DG		 4407 * Get session list pointer. This pointer MUST NOT be free(). This list is
4408 * statically declared in session.c
273ea72c 4409 */
54d01ffb 4410 session_list_ptr = session_get_list();
b5541356 4411
5eb91c98
DG		 4412 /* Set up max poll set size */
4413 lttng_poll_set_max_size();
4414
cf3af59e 4415 /* Create thread to manage the client socket */
099e26bd
DG		 4416 ret = pthread_create(&client_thread, NULL,
4417 thread_manage_clients, (void *) NULL);
cf3af59e 4418 if (ret != 0) {
099e26bd 4419 perror("pthread_create clients");
cf3af59e
MD		 4420 goto exit_client;
4421 }
fac6795d 4422
099e26bd
DG		 4423 /* Create thread to dispatch registration */
4424 ret = pthread_create(&dispatch_thread, NULL,
4425 thread_dispatch_ust_registration, (void *) NULL);
4426 if (ret != 0) {
4427 perror("pthread_create dispatch");
4428 goto exit_dispatch;
4429 }
4430
4431 /* Create thread to manage application registration. */
4432 ret = pthread_create(&reg_apps_thread, NULL,
4433 thread_registration_apps, (void *) NULL);
4434 if (ret != 0) {
4435 perror("pthread_create registration");
4436 goto exit_reg_apps;
4437 }
4438
cf3af59e 4439 /* Create thread to manage application socket */
54d01ffb
DG		 4440 ret = pthread_create(&apps_thread, NULL,
4441 thread_manage_apps, (void *) NULL);
cf3af59e 4442 if (ret != 0) {
099e26bd 4443 perror("pthread_create apps");
cf3af59e
MD		 4444 goto exit_apps;
4445 }
fac6795d 4446
cf3af59e 4447 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4448 ret = pthread_create(&kernel_thread, NULL,
4449 thread_manage_kernel, (void *) NULL);
cf3af59e 4450 if (ret != 0) {
099e26bd 4451 perror("pthread_create kernel");
cf3af59e
MD		 4452 goto exit_kernel;
4453 }
7a485870 4454
cf3af59e
MD		 4455 ret = pthread_join(kernel_thread, &status);
4456 if (ret != 0) {
4457 perror("pthread_join");
4458 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4459 }
4460
cf3af59e
MD		 4461exit_kernel:
4462 ret = pthread_join(apps_thread, &status);
4463 if (ret != 0) {
4464 perror("pthread_join");
4465 goto error; /* join error, exit without cleanup */
4466 }
fac6795d 4467
cf3af59e 4468exit_apps:
099e26bd
DG		 4469 ret = pthread_join(reg_apps_thread, &status);
4470 if (ret != 0) {
4471 perror("pthread_join");
4472 goto error; /* join error, exit without cleanup */
4473 }
4474
4475exit_reg_apps:
4476 ret = pthread_join(dispatch_thread, &status);
4477 if (ret != 0) {
4478 perror("pthread_join");
4479 goto error; /* join error, exit without cleanup */
4480 }
4481
4482exit_dispatch:
cf3af59e
MD		 4483 ret = pthread_join(client_thread, &status);
4484 if (ret != 0) {
4485 perror("pthread_join");
4486 goto error; /* join error, exit without cleanup */
4487 }
4488
3bd1e081 4489 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4490 if (ret != 0) {
3bd1e081 4491 perror("join_consumer");
cf3af59e
MD		 4492 goto error; /* join error, exit without cleanup */
4493 }
a88df331 4494
cf3af59e 4495exit_client:
a88df331 4496exit:
cf3af59e
MD		 4497 /*
4498 * cleanup() is called when no other thread is running.
4499 */
f6a9efaa 4500 rcu_thread_online();
cf3af59e 4501 cleanup();
f6a9efaa
DG		 4502 rcu_thread_offline();
4503 rcu_unregister_thread();
67e40797 4504 if (!ret) {
cf3af59e 4505 exit(EXIT_SUCCESS);
67e40797 4506 }
cf3af59e 4507error:
5e16da05 4508 exit(EXIT_FAILURE);
fac6795d 4509}
LTTng 2.0 tools and control repository
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