Implement filter bytecode support in lttng-session, and parse filter string
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
CommitLineData
826d496d
MD
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
d14d33bf
AM
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
91d76f53 8 *
d14d33bf
AM
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
91d76f53 13 *
d14d33bf
AM
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
fac6795d
DG
20#include <getopt.h>
21#include <grp.h>
22#include <limits.h>
23#include <pthread.h>
8c0faa1d 24#include <semaphore.h>
fac6795d
DG
25#include <signal.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
0fdd1e2c 29#include <sys/mman.h>
b73401da 30#include <sys/mount.h>
1e307fab 31#include <sys/resource.h>
fac6795d
DG
32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/types.h>
0fdd1e2c 35#include <sys/wait.h>
5c827ce0 36#include <urcu/uatomic.h>
fac6795d 37#include <unistd.h>
3bd1e081 38#include <config.h>
fac6795d 39
990570ed 40#include <common/common.h>
0ba98ebc 41#include <common/compat/poll.h>
d27c42b8 42#include <common/compat/socket.h>
db758600
DG
43#include <common/defaults.h>
44#include <common/kernel-consumer/kernel-consumer.h>
50c8f484 45#include <common/futex.h>
00e2e675 46#include <common/relayd/relayd.h>
fac6795d 47
10a8a223 48#include "lttng-sessiond.h"
54d01ffb 49#include "channel.h"
00e2e675 50#include "consumer.h"
099e26bd 51#include "context.h"
54d01ffb 52#include "event.h"
4771f025 53#include "kernel.h"
f1e16794 54#include "kernel-consumer.h"
096102bd 55#include "modprobe.h"
0fdd1e2c 56#include "shm.h"
1e307fab 57#include "ust-ctl.h"
00e2e675 58#include "ust-consumer.h"
8e68d1c8 59#include "utils.h"
4063050c 60#include "fd-limit.h"
53a80697 61#include "filter.h"
fac6795d 62
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MD
63#define CONSUMERD_FILE "lttng-consumerd"
64
75462a81 65/* Const values */
686204ab 66const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 67const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD
68const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
69const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
70
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71const char *progname;
72const char *opt_tracing_group;
5b8719f5 73static int opt_sig_parent;
97e19046 74static int opt_verbose_consumer;
fac6795d 75static int opt_daemon;
4fba7219 76static int opt_no_kernel;
fac6795d 77static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 78static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 79static char *rundir;
3bd1e081
MD
80
81/* Consumer daemon specific control data */
82static struct consumer_data kconsumer_data = {
83 .type = LTTNG_CONSUMER_KERNEL,
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DG
84 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
85 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
03550b58
MD
86 .err_sock = -1,
87 .cmd_sock = -1,
3bd1e081 88};
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MD
89static struct consumer_data ustconsumer64_data = {
90 .type = LTTNG_CONSUMER64_UST,
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DG
91 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
92 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
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MD
93 .err_sock = -1,
94 .cmd_sock = -1,
7753dea8
MD
95};
96static struct consumer_data ustconsumer32_data = {
97 .type = LTTNG_CONSUMER32_UST,
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98 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
99 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
03550b58
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100 .err_sock = -1,
101 .cmd_sock = -1,
3bd1e081
MD
102};
103
099e26bd 104static int dispatch_thread_exit;
fac6795d 105
54d01ffb
DG
106/* Global application Unix socket path */
107static char apps_unix_sock_path[PATH_MAX];
108/* Global client Unix socket path */
109static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
110/* global wait shm path for UST */
111static char wait_shm_path[PATH_MAX];
fac6795d 112
1d4b027a 113/* Sockets and FDs */
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MD
114static int client_sock = -1;
115static int apps_sock = -1;
116static int kernel_tracer_fd = -1;
76d7553f 117static int kernel_poll_pipe[2] = { -1, -1 };
1d4b027a 118
273ea72c
DG
119/*
120 * Quit pipe for all threads. This permits a single cancellation point
121 * for all threads when receiving an event on the pipe.
122 */
76d7553f 123static int thread_quit_pipe[2] = { -1, -1 };
273ea72c 124
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125/*
126 * This pipe is used to inform the thread managing application communication
127 * that a command is queued and ready to be processed.
128 */
76d7553f 129static int apps_cmd_pipe[2] = { -1, -1 };
099e26bd 130
1d4b027a 131/* Pthread, Mutexes and Semaphores */
1d4b027a 132static pthread_t apps_thread;
099e26bd 133static pthread_t reg_apps_thread;
1d4b027a 134static pthread_t client_thread;
7a485870 135static pthread_t kernel_thread;
099e26bd 136static pthread_t dispatch_thread;
5eb91c98 137
099e26bd
DG
138/*
139 * UST registration command queue. This queue is tied with a futex and uses a N
140 * wakers / 1 waiter implemented and detailed in futex.c/.h
141 *
142 * The thread_manage_apps and thread_dispatch_ust_registration interact with
143 * this queue and the wait/wake scheme.
144 */
145static struct ust_cmd_queue ust_cmd_queue;
146
b5541356
DG
147/*
148 * Pointer initialized before thread creation.
149 *
150 * This points to the tracing session list containing the session count and a
151 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
152 * MUST NOT be taken if you call a public function in session.c.
04ea676f 153 *
d063d709 154 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 155 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
156 */
157static struct ltt_session_list *session_list_ptr;
158
7753dea8
MD
159int ust_consumerd64_fd = -1;
160int ust_consumerd32_fd = -1;
161
fb6f1fa2
YB
162static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
163static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
164static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
165static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a 166
5c827ce0
DG
167/*
168 * Consumer daemon state which is changed when spawning it, killing it or in
169 * case of a fatal error.
170 */
171enum consumerd_state {
172 CONSUMER_STARTED = 1,
173 CONSUMER_STOPPED = 2,
174 CONSUMER_ERROR = 3,
175};
176
177/*
178 * This consumer daemon state is used to validate if a client command will be
179 * able to reach the consumer. If not, the client is informed. For instance,
180 * doing a "lttng start" when the consumer state is set to ERROR will return an
181 * error to the client.
182 *
183 * The following example shows a possible race condition of this scheme:
184 *
185 * consumer thread error happens
186 * client cmd arrives
187 * client cmd checks state -> still OK
188 * consumer thread exit, sets error
189 * client cmd try to talk to consumer
190 * ...
191 *
192 * However, since the consumer is a different daemon, we have no way of making
193 * sure the command will reach it safely even with this state flag. This is why
194 * we consider that up to the state validation during command processing, the
195 * command is safe. After that, we can not guarantee the correctness of the
196 * client request vis-a-vis the consumer.
197 */
198static enum consumerd_state ust_consumerd_state;
199static enum consumerd_state kernel_consumerd_state;
200
00e2e675
DG
201/*
202 * Used to keep a unique index for each relayd socket created where this value
203 * is associated with streams on the consumer so it can match the right relayd
204 * to send to.
205 *
206 * This value should be incremented atomically for safety purposes and future
207 * possible concurrent access.
208 */
209static unsigned int relayd_net_seq_idx;
210
fb09408a 211static
7753dea8 212void setup_consumerd_path(void)
fb09408a 213{
fc7a59ce 214 const char *bin, *libdir;
fb09408a 215
7753dea8
MD
216 /*
217 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
218 * native architecture size consumer if CONFIG_CONSUMER*_PATH
219 * has not been defined.
7753dea8 220 */
ebaeda94 221#if (CAA_BITS_PER_LONG == 32)
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AM
222 if (!consumerd32_bin[0]) {
223 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
224 }
225 if (!consumerd32_libdir[0]) {
226 consumerd32_libdir = INSTALL_LIB_PATH;
227 }
228#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
229 if (!consumerd64_bin[0]) {
230 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 231 }
ebaeda94
MD
232 if (!consumerd64_libdir[0]) {
233 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
234 }
235#else
236#error "Unknown bitness"
237#endif
238
fb09408a
MD
239 /*
240 * runtime env. var. overrides the build default.
241 */
fc7a59ce
AM
242 bin = getenv("LTTNG_CONSUMERD32_BIN");
243 if (bin) {
244 consumerd32_bin = bin;
7753dea8 245 }
fc7a59ce
AM
246 bin = getenv("LTTNG_CONSUMERD64_BIN");
247 if (bin) {
248 consumerd64_bin = bin;
ebaeda94 249 }
72f579ee 250 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
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MD
251 if (libdir) {
252 consumerd32_libdir = libdir;
253 }
72f579ee 254 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD
255 if (libdir) {
256 consumerd64_libdir = libdir;
fb09408a
MD
257 }
258}
259
5eb91c98
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260/*
261 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
262 */
263static int create_thread_poll_set(struct lttng_poll_event *events,
264 unsigned int size)
265{
266 int ret;
267
268 if (events == NULL || size == 0) {
269 ret = -1;
270 goto error;
271 }
272
273 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
274 if (ret < 0) {
275 goto error;
276 }
277
278 /* Add quit pipe */
279 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
280 if (ret < 0) {
281 goto error;
282 }
283
284 return 0;
285
286error:
287 return ret;
288}
289
290/*
291 * Check if the thread quit pipe was triggered.
292 *
293 * Return 1 if it was triggered else 0;
294 */
295static int check_thread_quit_pipe(int fd, uint32_t events)
296{
297 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
298 return 1;
299 }
300
301 return 0;
302}
303
0fdd1e2c
DG
304/*
305 * Return group ID of the tracing group or -1 if not found.
306 */
996b65c8
MD
307static gid_t allowed_group(void)
308{
309 struct group *grp;
310
274e143b
MD
311 if (opt_tracing_group) {
312 grp = getgrnam(opt_tracing_group);
313 } else {
314 grp = getgrnam(default_tracing_group);
315 }
996b65c8
MD
316 if (!grp) {
317 return -1;
318 } else {
319 return grp->gr_gid;
320 }
321}
322
273ea72c 323/*
5eb91c98 324 * Init thread quit pipe.
273ea72c
DG
325 *
326 * Return -1 on error or 0 if all pipes are created.
327 */
328static int init_thread_quit_pipe(void)
329{
730389d9 330 int ret, i;
273ea72c 331
730389d9 332 ret = pipe(thread_quit_pipe);
273ea72c 333 if (ret < 0) {
730389d9 334 PERROR("thread quit pipe");
273ea72c
DG
335 goto error;
336 }
337
730389d9
DG
338 for (i = 0; i < 2; i++) {
339 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
340 if (ret < 0) {
341 PERROR("fcntl");
342 goto error;
343 }
344 }
345
273ea72c
DG
346error:
347 return ret;
348}
349
fac6795d 350/*
d063d709
DG
351 * Complete teardown of a kernel session. This free all data structure related
352 * to a kernel session and update counter.
fac6795d 353 */
1d4b027a 354static void teardown_kernel_session(struct ltt_session *session)
fac6795d 355{
8f7a84dd 356 if (!session->kernel_session) {
99bab54f 357 DBG3("No kernel session when tearing down session");
84ea9c99 358 return;
8f7a84dd
DG
359 }
360
84ea9c99 361 DBG("Tearing down kernel session");
d9800920 362
84ea9c99
MD
363 /*
364 * If a custom kernel consumer was registered, close the socket before
365 * tearing down the complete kernel session structure
366 */
03550b58
MD
367 if (kconsumer_data.cmd_sock >= 0 &&
368 session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
84ea9c99 369 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 370 }
84ea9c99
MD
371
372 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
373}
374
f6a9efaa
DG
375/*
376 * Complete teardown of all UST sessions. This will free everything on his path
377 * and destroy the core essence of all ust sessions :)
378 */
379static void teardown_ust_session(struct ltt_session *session)
380{
84cd17c6
MD
381 int ret;
382
8f7a84dd 383 if (!session->ust_session) {
99bab54f 384 DBG3("No UST session when tearing down session");
f470a390 385 return;
8f7a84dd
DG
386 }
387
84ea9c99 388 DBG("Tearing down UST session(s)");
8f7a84dd 389
84cd17c6
MD
390 ret = ust_app_destroy_trace_all(session->ust_session);
391 if (ret) {
392 ERR("Error in ust_app_destroy_trace_all");
393 }
8f7a84dd 394
f6a9efaa
DG
395 trace_ust_destroy_session(session->ust_session);
396}
397
099e26bd
DG
398/*
399 * Stop all threads by closing the thread quit pipe.
400 */
cf3af59e
MD
401static void stop_threads(void)
402{
5eb91c98
DG
403 int ret;
404
cf3af59e
MD
405 /* Stopping all threads */
406 DBG("Terminating all threads");
54d01ffb 407 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
408 if (ret < 0) {
409 ERR("write error on thread quit pipe");
410 }
411
099e26bd
DG
412 /* Dispatch thread */
413 dispatch_thread_exit = 1;
414 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
415}
416
fac6795d 417/*
d063d709 418 * Cleanup the daemon
fac6795d 419 */
cf3af59e 420static void cleanup(void)
fac6795d 421{
ef599319 422 int ret;
1d4b027a 423 char *cmd;
af9737e9 424 struct ltt_session *sess, *stmp;
fac6795d 425
1d4b027a 426 DBG("Cleaning up");
e07ae692 427
67e40797
DG
428 DBG("Removing %s directory", rundir);
429 ret = asprintf(&cmd, "rm -rf %s", rundir);
430 if (ret < 0) {
431 ERR("asprintf failed. Something is really wrong!");
432 }
5461b305 433
67e40797
DG
434 /* Remove lttng run directory */
435 ret = system(cmd);
436 if (ret < 0) {
437 ERR("Unable to clean %s", rundir);
1d4b027a 438 }
67e40797 439 free(cmd);
5461b305 440
99bab54f 441 DBG("Cleaning up all sessions");
fac6795d 442
b5541356 443 /* Destroy session list mutex */
273ea72c
DG
444 if (session_list_ptr != NULL) {
445 pthread_mutex_destroy(&session_list_ptr->lock);
446
447 /* Cleanup ALL session */
54d01ffb
DG
448 cds_list_for_each_entry_safe(sess, stmp,
449 &session_list_ptr->head, list) {
273ea72c 450 teardown_kernel_session(sess);
f6a9efaa
DG
451 teardown_ust_session(sess);
452 free(sess);
273ea72c
DG
453 }
454 }
455
099e26bd 456 DBG("Closing all UST sockets");
56fff090 457 ust_app_clean_list();
099e26bd 458
3bd1e081 459 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 460
4fba7219
DG
461 if (is_root && !opt_no_kernel) {
462 DBG2("Closing kernel fd");
a4b35e07 463 if (kernel_tracer_fd >= 0) {
76d7553f
MD
464 ret = close(kernel_tracer_fd);
465 if (ret) {
466 PERROR("close");
467 }
a4b35e07 468 }
2f50c8a3 469 DBG("Unloading kernel modules");
096102bd 470 modprobe_remove_lttng_all();
2f50c8a3 471 }
ef599319
DG
472 utils_close_pipe(kernel_poll_pipe);
473 utils_close_pipe(thread_quit_pipe);
474 utils_close_pipe(apps_cmd_pipe);
421cb601
DG
475
476 /* <fun> */
f56a39af 477 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
478 "Matthew, BEET driven development works!%c[%dm",
479 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
480 /* </fun> */
fac6795d
DG
481}
482
e065084a 483/*
d063d709 484 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 485 *
d063d709 486 * Return lttcomm error code.
e065084a
DG
487 */
488static int send_unix_sock(int sock, void *buf, size_t len)
489{
490 /* Check valid length */
491 if (len <= 0) {
492 return -1;
493 }
494
495 return lttcomm_send_unix_sock(sock, buf, len);
496}
497
5461b305 498/*
d063d709 499 * Free memory of a command context structure.
5461b305 500 */
a2fb29a5 501static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 502{
a2fb29a5
DG
503 DBG("Clean command context structure");
504 if (*cmd_ctx) {
505 if ((*cmd_ctx)->llm) {
506 free((*cmd_ctx)->llm);
5461b305 507 }
a2fb29a5
DG
508 if ((*cmd_ctx)->lsm) {
509 free((*cmd_ctx)->lsm);
5461b305 510 }
a2fb29a5
DG
511 free(*cmd_ctx);
512 *cmd_ctx = NULL;
5461b305
DG
513 }
514}
515
fac6795d 516/*
0fdd1e2c 517 * Notify UST applications using the shm mmap futex.
fac6795d 518 */
0fdd1e2c 519static int notify_ust_apps(int active)
fac6795d 520{
0fdd1e2c 521 char *wait_shm_mmap;
fac6795d 522
0fdd1e2c 523 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 524
0fdd1e2c
DG
525 /* See shm.c for this call implying mmap, shm and futex calls */
526 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
527 if (wait_shm_mmap == NULL) {
fac6795d
DG
528 goto error;
529 }
530
0fdd1e2c
DG
531 /* Wake waiting process */
532 futex_wait_update((int32_t *) wait_shm_mmap, active);
533
534 /* Apps notified successfully */
535 return 0;
fac6795d
DG
536
537error:
0fdd1e2c 538 return -1;
fac6795d
DG
539}
540
e065084a 541/*
d063d709
DG
542 * Setup the outgoing data buffer for the response (llm) by allocating the
543 * right amount of memory and copying the original information from the lsm
544 * structure.
ca95a216 545 *
d063d709 546 * Return total size of the buffer pointed by buf.
ca95a216 547 */
5461b305 548static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 549{
f3ed775e 550 int ret, buf_size;
ca95a216 551
f3ed775e 552 buf_size = size;
5461b305 553
ba7f0ae5 554 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 555 if (cmd_ctx->llm == NULL) {
76d7553f 556 PERROR("zmalloc");
5461b305 557 ret = -ENOMEM;
ca95a216
DG
558 goto error;
559 }
560
5461b305
DG
561 /* Copy common data */
562 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 563 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 564
5461b305
DG
565 cmd_ctx->llm->data_size = size;
566 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
567
ca95a216
DG
568 return buf_size;
569
570error:
571 return ret;
572}
573
7a485870 574/*
5eb91c98 575 * Update the kernel poll set of all channel fd available over all tracing
d063d709 576 * session. Add the wakeup pipe at the end of the set.
7a485870 577 */
5eb91c98 578static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 579{
5eb91c98 580 int ret;
7a485870
DG
581 struct ltt_session *session;
582 struct ltt_kernel_channel *channel;
583
5eb91c98 584 DBG("Updating kernel poll set");
7a485870 585
54d01ffb 586 session_lock_list();
b5541356 587 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 588 session_lock(session);
7a485870 589 if (session->kernel_session == NULL) {
54d01ffb 590 session_unlock(session);
7a485870
DG
591 continue;
592 }
7a485870 593
54d01ffb
DG
594 cds_list_for_each_entry(channel,
595 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
596 /* Add channel fd to the kernel poll set */
597 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
598 if (ret < 0) {
54d01ffb 599 session_unlock(session);
5eb91c98
DG
600 goto error;
601 }
602 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 603 }
54d01ffb 604 session_unlock(session);
7a485870 605 }
54d01ffb 606 session_unlock_list();
7a485870 607
5eb91c98 608 return 0;
7a485870
DG
609
610error:
54d01ffb 611 session_unlock_list();
7a485870
DG
612 return -1;
613}
614
615/*
54d01ffb 616 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 617 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 618 *
d063d709 619 * Useful for CPU hotplug feature.
7a485870 620 */
2bdd86d4 621static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
622{
623 int ret = 0;
624 struct ltt_session *session;
625 struct ltt_kernel_channel *channel;
626
627 DBG("Updating kernel streams for channel fd %d", fd);
628
54d01ffb 629 session_lock_list();
b5541356 630 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 631 session_lock(session);
7a485870 632 if (session->kernel_session == NULL) {
54d01ffb 633 session_unlock(session);
7a485870
DG
634 continue;
635 }
d9800920 636
03550b58
MD
637 /* This is not suppose to be -1 but this is an extra security check */
638 if (session->kernel_session->consumer_fd < 0) {
3bd1e081 639 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
640 }
641
5eb91c98
DG
642 cds_list_for_each_entry(channel,
643 &session->kernel_session->channel_list.head, list) {
7a485870
DG
644 if (channel->fd == fd) {
645 DBG("Channel found, updating kernel streams");
646 ret = kernel_open_channel_stream(channel);
647 if (ret < 0) {
b3c750d2 648 goto error;
7a485870 649 }
d9800920 650
7a485870 651 /*
5eb91c98
DG
652 * Have we already sent fds to the consumer? If yes, it means
653 * that tracing is started so it is safe to send our updated
654 * stream fds.
7a485870 655 */
00e2e675
DG
656 if (session->kernel_session->consumer_fds_sent == 1 &&
657 session->kernel_session->consumer != NULL) {
658 ret = kernel_consumer_send_channel_stream(
659 session->kernel_session->consumer_fd, channel,
660 session->kernel_session);
7a485870 661 if (ret < 0) {
b3c750d2 662 goto error;
7a485870
DG
663 }
664 }
b3c750d2 665 goto error;
7a485870
DG
666 }
667 }
54d01ffb 668 session_unlock(session);
7a485870 669 }
54d01ffb 670 session_unlock_list();
b3c750d2 671 return ret;
7a485870 672
b3c750d2 673error:
54d01ffb
DG
674 session_unlock(session);
675 session_unlock_list();
7a485870
DG
676 return ret;
677}
678
487cf67c
DG
679/*
680 * For each tracing session, update newly registered apps.
681 */
682static void update_ust_app(int app_sock)
683{
684 struct ltt_session *sess, *stmp;
685
4ee14516
DG
686 session_lock_list();
687
487cf67c
DG
688 /* For all tracing session(s) */
689 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 690 session_lock(sess);
421cb601
DG
691 if (sess->ust_session) {
692 ust_app_global_update(sess->ust_session, app_sock);
693 }
4ee14516 694 session_unlock(sess);
487cf67c 695 }
4ee14516
DG
696
697 session_unlock_list();
487cf67c
DG
698}
699
7a485870 700/*
d063d709 701 * This thread manage event coming from the kernel.
7a485870 702 *
d063d709
DG
703 * Features supported in this thread:
704 * -) CPU Hotplug
7a485870
DG
705 */
706static void *thread_manage_kernel(void *data)
707{
5eb91c98
DG
708 int ret, i, pollfd, update_poll_flag = 1;
709 uint32_t revents, nb_fd;
7a485870 710 char tmp;
5eb91c98 711 struct lttng_poll_event events;
7a485870
DG
712
713 DBG("Thread manage kernel started");
714
5eb91c98
DG
715 ret = create_thread_poll_set(&events, 2);
716 if (ret < 0) {
76d7553f 717 goto error_poll_create;
5eb91c98
DG
718 }
719
720 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
721 if (ret < 0) {
722 goto error;
723 }
724
7a485870
DG
725 while (1) {
726 if (update_poll_flag == 1) {
5f822d0a
DG
727 /*
728 * Reset number of fd in the poll set. Always 2 since there is the thread
729 * quit pipe and the kernel pipe.
730 */
731 events.nb_fd = 2;
732
5eb91c98
DG
733 ret = update_kernel_poll(&events);
734 if (ret < 0) {
7a485870
DG
735 goto error;
736 }
737 update_poll_flag = 0;
738 }
739
5eb91c98
DG
740 nb_fd = LTTNG_POLL_GETNB(&events);
741
742 DBG("Thread kernel polling on %d fds", nb_fd);
743
744 /* Zeroed the poll events */
745 lttng_poll_reset(&events);
7a485870
DG
746
747 /* Poll infinite value of time */
88f2b785 748 restart:
5eb91c98 749 ret = lttng_poll_wait(&events, -1);
7a485870 750 if (ret < 0) {
88f2b785
MD
751 /*
752 * Restart interrupted system call.
753 */
754 if (errno == EINTR) {
755 goto restart;
756 }
7a485870
DG
757 goto error;
758 } else if (ret == 0) {
759 /* Should not happen since timeout is infinite */
85611738
DG
760 ERR("Return value of poll is 0 with an infinite timeout.\n"
761 "This should not have happened! Continuing...");
7a485870
DG
762 continue;
763 }
764
5eb91c98
DG
765 for (i = 0; i < nb_fd; i++) {
766 /* Fetch once the poll data */
767 revents = LTTNG_POLL_GETEV(&events, i);
768 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 769
5eb91c98
DG
770 /* Thread quit pipe has been closed. Killing thread. */
771 ret = check_thread_quit_pipe(pollfd, revents);
772 if (ret) {
773 goto error;
774 }
7a485870 775
5eb91c98
DG
776 /* Check for data on kernel pipe */
777 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
778 ret = read(kernel_poll_pipe[0], &tmp, 1);
779 update_poll_flag = 1;
780 continue;
781 } else {
782 /*
783 * New CPU detected by the kernel. Adding kernel stream to
784 * kernel session and updating the kernel consumer
785 */
786 if (revents & LPOLLIN) {
2bdd86d4 787 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
788 if (ret < 0) {
789 continue;
790 }
791 break;
792 /*
793 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
794 * and unregister kernel stream at this point.
795 */
7a485870 796 }
7a485870
DG
797 }
798 }
799 }
800
801error:
5eb91c98 802 lttng_poll_clean(&events);
76d7553f
MD
803error_poll_create:
804 DBG("Kernel thread dying");
7a485870
DG
805 return NULL;
806}
807
1d4b027a 808/*
3bd1e081 809 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 810 */
3bd1e081 811static void *thread_manage_consumer(void *data)
1d4b027a 812{
76d7553f 813 int sock = -1, i, ret, pollfd;
5eb91c98 814 uint32_t revents, nb_fd;
1d4b027a 815 enum lttcomm_return_code code;
5eb91c98 816 struct lttng_poll_event events;
3bd1e081 817 struct consumer_data *consumer_data = data;
1d4b027a 818
3bd1e081 819 DBG("[thread] Manage consumer started");
1d4b027a 820
3bd1e081 821 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a 822 if (ret < 0) {
76d7553f 823 goto error_listen;
1d4b027a
DG
824 }
825
5eb91c98
DG
826 /*
827 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
828 * Nothing more will be added to this poll set.
829 */
830 ret = create_thread_poll_set(&events, 2);
831 if (ret < 0) {
76d7553f 832 goto error_poll;
5eb91c98 833 }
273ea72c 834
3bd1e081 835 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
836 if (ret < 0) {
837 goto error;
838 }
839
840 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
841
842 /* Inifinite blocking call, waiting for transmission */
88f2b785 843restart:
5eb91c98 844 ret = lttng_poll_wait(&events, -1);
273ea72c 845 if (ret < 0) {
88f2b785
MD
846 /*
847 * Restart interrupted system call.
848 */
849 if (errno == EINTR) {
850 goto restart;
851 }
273ea72c
DG
852 goto error;
853 }
854
5eb91c98
DG
855 for (i = 0; i < nb_fd; i++) {
856 /* Fetch once the poll data */
857 revents = LTTNG_POLL_GETEV(&events, i);
858 pollfd = LTTNG_POLL_GETFD(&events, i);
859
860 /* Thread quit pipe has been closed. Killing thread. */
861 ret = check_thread_quit_pipe(pollfd, revents);
862 if (ret) {
863 goto error;
864 }
865
866 /* Event on the registration socket */
3bd1e081 867 if (pollfd == consumer_data->err_sock) {
5eb91c98 868 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 869 ERR("consumer err socket poll error");
5eb91c98
DG
870 goto error;
871 }
872 }
273ea72c
DG
873 }
874
3bd1e081 875 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
876 if (sock < 0) {
877 goto error;
878 }
879
3bd1e081 880 DBG2("Receiving code from consumer err_sock");
ee0b0061 881
712ea556 882 /* Getting status code from kconsumerd */
54d01ffb
DG
883 ret = lttcomm_recv_unix_sock(sock, &code,
884 sizeof(enum lttcomm_return_code));
1d4b027a
DG
885 if (ret <= 0) {
886 goto error;
887 }
888
3bd1e081
MD
889 if (code == CONSUMERD_COMMAND_SOCK_READY) {
890 consumer_data->cmd_sock =
891 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
892 if (consumer_data->cmd_sock < 0) {
893 sem_post(&consumer_data->sem);
48842b30 894 PERROR("consumer connect");
1d4b027a
DG
895 goto error;
896 }
897 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
898 sem_post(&consumer_data->sem);
899 DBG("consumer command socket ready");
1d4b027a 900 } else {
3bd1e081 901 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
902 lttcomm_get_readable_code(-code));
903 goto error;
904 }
905
54d01ffb 906 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 907 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 908 if (ret < 0) {
72079cae
DG
909 goto error;
910 }
911
5eb91c98
DG
912 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
913 if (ret < 0) {
72079cae 914 goto error;
5eb91c98
DG
915 }
916
917 /* Update number of fd */
918 nb_fd = LTTNG_POLL_GETNB(&events);
919
920 /* Inifinite blocking call, waiting for transmission */
88f2b785 921restart_poll:
5eb91c98
DG
922 ret = lttng_poll_wait(&events, -1);
923 if (ret < 0) {
88f2b785
MD
924 /*
925 * Restart interrupted system call.
926 */
927 if (errno == EINTR) {
928 goto restart_poll;
929 }
72079cae
DG
930 goto error;
931 }
932
5eb91c98
DG
933 for (i = 0; i < nb_fd; i++) {
934 /* Fetch once the poll data */
935 revents = LTTNG_POLL_GETEV(&events, i);
936 pollfd = LTTNG_POLL_GETFD(&events, i);
937
938 /* Thread quit pipe has been closed. Killing thread. */
939 ret = check_thread_quit_pipe(pollfd, revents);
940 if (ret) {
941 goto error;
942 }
943
944 /* Event on the kconsumerd socket */
945 if (pollfd == sock) {
946 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 947 ERR("consumer err socket second poll error");
5eb91c98
DG
948 goto error;
949 }
950 }
951 }
952
712ea556 953 /* Wait for any kconsumerd error */
54d01ffb
DG
954 ret = lttcomm_recv_unix_sock(sock, &code,
955 sizeof(enum lttcomm_return_code));
712ea556 956 if (ret <= 0) {
3bd1e081 957 ERR("consumer closed the command socket");
712ea556 958 goto error;
6f61d021 959 }
1d4b027a 960
3bd1e081 961 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 962
1d4b027a 963error:
5c827ce0
DG
964 /* Immediately set the consumerd state to stopped */
965 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
966 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
967 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
968 consumer_data->type == LTTNG_CONSUMER32_UST) {
969 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
970 } else {
971 /* Code flow error... */
972 assert(0);
973 }
974
76d7553f
MD
975 if (consumer_data->err_sock >= 0) {
976 ret = close(consumer_data->err_sock);
977 if (ret) {
978 PERROR("close");
979 }
980 }
981 if (consumer_data->cmd_sock >= 0) {
982 ret = close(consumer_data->cmd_sock);
983 if (ret) {
984 PERROR("close");
985 }
986 }
987 if (sock >= 0) {
988 ret = close(sock);
989 if (ret) {
990 PERROR("close");
991 }
992 }
273ea72c 993
3bd1e081
MD
994 unlink(consumer_data->err_unix_sock_path);
995 unlink(consumer_data->cmd_unix_sock_path);
996 consumer_data->pid = 0;
1d4b027a 997
5eb91c98 998 lttng_poll_clean(&events);
76d7553f
MD
999error_poll:
1000error_listen:
1001 DBG("consumer thread cleanup completed");
0177d773 1002
5eb91c98 1003 return NULL;
099e26bd
DG
1004}
1005
099e26bd
DG
1006/*
1007 * This thread manage application communication.
1d4b027a
DG
1008 */
1009static void *thread_manage_apps(void *data)
099e26bd 1010{
5eb91c98
DG
1011 int i, ret, pollfd;
1012 uint32_t revents, nb_fd;
099e26bd 1013 struct ust_command ust_cmd;
5eb91c98 1014 struct lttng_poll_event events;
099e26bd
DG
1015
1016 DBG("[thread] Manage application started");
1017
f6a9efaa
DG
1018 rcu_register_thread();
1019 rcu_thread_online();
1020
5eb91c98
DG
1021 ret = create_thread_poll_set(&events, 2);
1022 if (ret < 0) {
76d7553f 1023 goto error_poll_create;
5eb91c98 1024 }
099e26bd 1025
5eb91c98
DG
1026 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1027 if (ret < 0) {
1028 goto error;
1029 }
099e26bd 1030
5eb91c98
DG
1031 while (1) {
1032 /* Zeroed the events structure */
1033 lttng_poll_reset(&events);
0177d773 1034
5eb91c98 1035 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1036
1037 DBG("Apps thread polling on %d fds", nb_fd);
1038
1039 /* Inifinite blocking call, waiting for transmission */
88f2b785 1040 restart:
5eb91c98 1041 ret = lttng_poll_wait(&events, -1);
099e26bd 1042 if (ret < 0) {
88f2b785
MD
1043 /*
1044 * Restart interrupted system call.
1045 */
1046 if (errno == EINTR) {
1047 goto restart;
1048 }
099e26bd
DG
1049 goto error;
1050 }
1051
5eb91c98
DG
1052 for (i = 0; i < nb_fd; i++) {
1053 /* Fetch once the poll data */
1054 revents = LTTNG_POLL_GETEV(&events, i);
1055 pollfd = LTTNG_POLL_GETFD(&events, i);
1056
1057 /* Thread quit pipe has been closed. Killing thread. */
1058 ret = check_thread_quit_pipe(pollfd, revents);
1059 if (ret) {
099e26bd 1060 goto error;
5eb91c98 1061 }
099e26bd 1062
5eb91c98
DG
1063 /* Inspect the apps cmd pipe */
1064 if (pollfd == apps_cmd_pipe[0]) {
1065 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1066 ERR("Apps command pipe error");
0177d773 1067 goto error;
5eb91c98
DG
1068 } else if (revents & LPOLLIN) {
1069 /* Empty pipe */
1070 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1071 if (ret < 0 || ret < sizeof(ust_cmd)) {
76d7553f 1072 PERROR("read apps cmd pipe");
5eb91c98
DG
1073 goto error;
1074 }
099e26bd 1075
5eb91c98 1076 /* Register applicaton to the session daemon */
56fff090 1077 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1078 ust_cmd.sock);
88ff5b7f 1079 if (ret == -ENOMEM) {
5eb91c98 1080 goto error;
88ff5b7f
MD
1081 } else if (ret < 0) {
1082 break;
5eb91c98
DG
1083 }
1084
acc7b41b 1085 /*
e0c7ec2b 1086 * Validate UST version compatibility.
acc7b41b 1087 */
e0c7ec2b
DG
1088 ret = ust_app_validate_version(ust_cmd.sock);
1089 if (ret >= 0) {
1090 /*
1091 * Add channel(s) and event(s) to newly registered apps
1092 * from lttng global UST domain.
1093 */
1094 update_ust_app(ust_cmd.sock);
1095 }
acc7b41b 1096
f2ca2e25 1097 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG
1098 if (ret < 0) {
1099 /*
1100 * If the registration is not possible, we simply
1101 * unregister the apps and continue
1102 */
56fff090 1103 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1104 } else {
1105 /*
1106 * We just need here to monitor the close of the UST
1107 * socket and poll set monitor those by default.
a9ade966
MD
1108 * Listen on POLLIN (even if we never expect any
1109 * data) to ensure that hangup wakes us.
5eb91c98 1110 */
a9ade966 1111 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
5eb91c98
DG
1112 if (ret < 0) {
1113 goto error;
1114 }
1115
54d01ffb
DG
1116 DBG("Apps with sock %d added to poll set",
1117 ust_cmd.sock);
5eb91c98 1118 }
487cf67c 1119
5eb91c98 1120 break;
0177d773 1121 }
5eb91c98
DG
1122 } else {
1123 /*
54d01ffb
DG
1124 * At this point, we know that a registered application made
1125 * the event at poll_wait.
5eb91c98
DG
1126 */
1127 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1128 /* Removing from the poll set */
1129 ret = lttng_poll_del(&events, pollfd);
1130 if (ret < 0) {
1131 goto error;
1132 }
099e26bd 1133
b9d9b220 1134 /* Socket closed on remote end. */
56fff090 1135 ust_app_unregister(pollfd);
5eb91c98
DG
1136 break;
1137 }
099e26bd
DG
1138 }
1139 }
099e26bd
DG
1140 }
1141
1142error:
5eb91c98 1143 lttng_poll_clean(&events);
76d7553f
MD
1144error_poll_create:
1145 DBG("Application communication apps thread cleanup complete");
f6a9efaa
DG
1146 rcu_thread_offline();
1147 rcu_unregister_thread();
099e26bd
DG
1148 return NULL;
1149}
1150
1151/*
1152 * Dispatch request from the registration threads to the application
1153 * communication thread.
1154 */
1155static void *thread_dispatch_ust_registration(void *data)
1156{
1157 int ret;
1158 struct cds_wfq_node *node;
1159 struct ust_command *ust_cmd = NULL;
1160
1161 DBG("[thread] Dispatch UST command started");
1162
1163 while (!dispatch_thread_exit) {
1164 /* Atomically prepare the queue futex */
1165 futex_nto1_prepare(&ust_cmd_queue.futex);
1166
1167 do {
1168 /* Dequeue command for registration */
1169 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1170 if (node == NULL) {
00a17c97 1171 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1172 /* Continue thread execution */
1173 break;
1174 }
1175
1176 ust_cmd = caa_container_of(node, struct ust_command, node);
1177
2f50c8a3
DG
1178 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1179 " gid:%d sock:%d name:%s (version %d.%d)",
1180 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1181 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1182 ust_cmd->sock, ust_cmd->reg_msg.name,
1183 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1184 /*
1185 * Inform apps thread of the new application registration. This
1186 * call is blocking so we can be assured that the data will be read
1187 * at some point in time or wait to the end of the world :)
1188 */
1189 ret = write(apps_cmd_pipe[1], ust_cmd,
1190 sizeof(struct ust_command));
1191 if (ret < 0) {
76d7553f 1192 PERROR("write apps cmd pipe");
099e26bd
DG
1193 if (errno == EBADF) {
1194 /*
1195 * We can't inform the application thread to process
1196 * registration. We will exit or else application
1197 * registration will not occur and tracing will never
1198 * start.
1199 */
1200 goto error;
1201 }
1202 }
1203 free(ust_cmd);
1204 } while (node != NULL);
1205
1206 /* Futex wait on queue. Blocking call on futex() */
1207 futex_nto1_wait(&ust_cmd_queue.futex);
1208 }
1209
1210error:
1211 DBG("Dispatch thread dying");
1212 return NULL;
1213}
1214
1215/*
1216 * This thread manage application registration.
1217 */
1218static void *thread_registration_apps(void *data)
1d4b027a 1219{
a4b35e07 1220 int sock = -1, i, ret, pollfd;
5eb91c98
DG
1221 uint32_t revents, nb_fd;
1222 struct lttng_poll_event events;
099e26bd
DG
1223 /*
1224 * Get allocated in this thread, enqueued to a global queue, dequeued and
1225 * freed in the manage apps thread.
1226 */
1227 struct ust_command *ust_cmd = NULL;
1d4b027a 1228
099e26bd 1229 DBG("[thread] Manage application registration started");
1d4b027a
DG
1230
1231 ret = lttcomm_listen_unix_sock(apps_sock);
1232 if (ret < 0) {
76d7553f 1233 goto error_listen;
1d4b027a
DG
1234 }
1235
5eb91c98
DG
1236 /*
1237 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1238 * more will be added to this poll set.
1239 */
1240 ret = create_thread_poll_set(&events, 2);
1241 if (ret < 0) {
76d7553f 1242 goto error_create_poll;
5eb91c98 1243 }
273ea72c 1244
5eb91c98
DG
1245 /* Add the application registration socket */
1246 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1247 if (ret < 0) {
76d7553f 1248 goto error_poll_add;
5eb91c98 1249 }
273ea72c 1250
1d4b027a 1251 /* Notify all applications to register */
0fdd1e2c
DG
1252 ret = notify_ust_apps(1);
1253 if (ret < 0) {
1254 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1255 "Execution continues but there might be problem for already\n"
1256 "running applications that wishes to register.");
0fdd1e2c 1257 }
1d4b027a
DG
1258
1259 while (1) {
1260 DBG("Accepting application registration");
273ea72c 1261
5eb91c98
DG
1262 nb_fd = LTTNG_POLL_GETNB(&events);
1263
273ea72c 1264 /* Inifinite blocking call, waiting for transmission */
88f2b785 1265 restart:
5eb91c98 1266 ret = lttng_poll_wait(&events, -1);
273ea72c 1267 if (ret < 0) {
88f2b785
MD
1268 /*
1269 * Restart interrupted system call.
1270 */
1271 if (errno == EINTR) {
1272 goto restart;
1273 }
273ea72c
DG
1274 goto error;
1275 }
1276
5eb91c98
DG
1277 for (i = 0; i < nb_fd; i++) {
1278 /* Fetch once the poll data */
1279 revents = LTTNG_POLL_GETEV(&events, i);
1280 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1281
5eb91c98
DG
1282 /* Thread quit pipe has been closed. Killing thread. */
1283 ret = check_thread_quit_pipe(pollfd, revents);
1284 if (ret) {
90014c57
DG
1285 goto error;
1286 }
1d4b027a 1287
5eb91c98
DG
1288 /* Event on the registration socket */
1289 if (pollfd == apps_sock) {
1290 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1291 ERR("Register apps socket poll error");
1292 goto error;
1293 } else if (revents & LPOLLIN) {
1294 sock = lttcomm_accept_unix_sock(apps_sock);
1295 if (sock < 0) {
1296 goto error;
1297 }
099e26bd 1298
5eb91c98 1299 /* Create UST registration command for enqueuing */
ba7f0ae5 1300 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1301 if (ust_cmd == NULL) {
76d7553f 1302 PERROR("ust command zmalloc");
5eb91c98
DG
1303 goto error;
1304 }
1d4b027a 1305
5eb91c98
DG
1306 /*
1307 * Using message-based transmissions to ensure we don't
1308 * have to deal with partially received messages.
1309 */
4063050c
MD
1310 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1311 if (ret < 0) {
1312 ERR("Exhausted file descriptors allowed for applications.");
1313 free(ust_cmd);
1314 ret = close(sock);
1315 if (ret) {
1316 PERROR("close");
1317 }
1318 sock = -1;
1319 continue;
1320 }
5eb91c98
DG
1321 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1322 sizeof(struct ust_register_msg));
1323 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1324 if (ret < 0) {
76d7553f 1325 PERROR("lttcomm_recv_unix_sock register apps");
5eb91c98
DG
1326 } else {
1327 ERR("Wrong size received on apps register");
1328 }
1329 free(ust_cmd);
76d7553f
MD
1330 ret = close(sock);
1331 if (ret) {
1332 PERROR("close");
1333 }
4063050c 1334 lttng_fd_put(LTTNG_FD_APPS, 1);
76d7553f 1335 sock = -1;
5eb91c98
DG
1336 continue;
1337 }
099e26bd 1338
5eb91c98 1339 ust_cmd->sock = sock;
34a2494f 1340 sock = -1;
099e26bd 1341
5eb91c98
DG
1342 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1343 " gid:%d sock:%d name:%s (version %d.%d)",
1344 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1345 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1346 ust_cmd->sock, ust_cmd->reg_msg.name,
1347 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1348
5eb91c98
DG
1349 /*
1350 * Lock free enqueue the registration request. The red pill
54d01ffb 1351 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1352 */
1353 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1354
1355 /*
1356 * Wake the registration queue futex. Implicit memory
1357 * barrier with the exchange in cds_wfq_enqueue.
1358 */
1359 futex_nto1_wake(&ust_cmd_queue.futex);
1360 }
1361 }
90014c57 1362 }
1d4b027a
DG
1363 }
1364
1365error:
0fdd1e2c
DG
1366 /* Notify that the registration thread is gone */
1367 notify_ust_apps(0);
1368
a4b35e07 1369 if (apps_sock >= 0) {
76d7553f
MD
1370 ret = close(apps_sock);
1371 if (ret) {
1372 PERROR("close");
1373 }
a4b35e07 1374 }
46c3f085 1375 if (sock >= 0) {
76d7553f
MD
1376 ret = close(sock);
1377 if (ret) {
1378 PERROR("close");
1379 }
4063050c 1380 lttng_fd_put(LTTNG_FD_APPS, 1);
a4b35e07 1381 }
273ea72c 1382 unlink(apps_unix_sock_path);
0fdd1e2c 1383
76d7553f 1384error_poll_add:
5eb91c98 1385 lttng_poll_clean(&events);
76d7553f
MD
1386error_listen:
1387error_create_poll:
1388 DBG("UST Registration thread cleanup complete");
5eb91c98 1389
1d4b027a
DG
1390 return NULL;
1391}
1392
8c0faa1d 1393/*
3bd1e081 1394 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1395 * exec or it will fails.
8c0faa1d 1396 */
3bd1e081 1397static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1398{
1399 int ret;
ee0b0061
DG
1400 struct timespec timeout;
1401
1402 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1403 timeout.tv_nsec = 0;
8c0faa1d
DG
1404
1405 /* Setup semaphore */
3bd1e081 1406 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1407 if (ret < 0) {
3bd1e081 1408 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1409 goto error;
1410 }
8c0faa1d 1411
3bd1e081
MD
1412 ret = pthread_create(&consumer_data->thread, NULL,
1413 thread_manage_consumer, consumer_data);
8c0faa1d 1414 if (ret != 0) {
3bd1e081 1415 PERROR("pthread_create consumer");
ee0b0061 1416 ret = -1;
8c0faa1d
DG
1417 goto error;
1418 }
1419
ee0b0061
DG
1420 /* Get time for sem_timedwait absolute timeout */
1421 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1422 if (ret < 0) {
3bd1e081 1423 PERROR("clock_gettime spawn consumer");
ee0b0061 1424 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1425 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1426 } else {
1427 /* Normal timeout if the gettime was successful */
1428 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1429 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1430 }
8c0faa1d 1431
ee0b0061
DG
1432 if (ret < 0) {
1433 if (errno == ETIMEDOUT) {
1434 /*
1435 * Call has timed out so we kill the kconsumerd_thread and return
1436 * an error.
1437 */
3bd1e081
MD
1438 ERR("The consumer thread was never ready. Killing it");
1439 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1440 if (ret < 0) {
3bd1e081 1441 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1442 }
1443 } else {
3bd1e081 1444 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1445 }
1446 goto error;
1447 }
1448
3bd1e081
MD
1449 pthread_mutex_lock(&consumer_data->pid_mutex);
1450 if (consumer_data->pid == 0) {
712ea556 1451 ERR("Kconsumerd did not start");
3bd1e081 1452 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1453 goto error;
1454 }
3bd1e081 1455 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1456
8c0faa1d
DG
1457 return 0;
1458
1459error:
1460 return ret;
1461}
1462
d9800920 1463/*
3bd1e081 1464 * Join consumer thread
d9800920 1465 */
3bd1e081 1466static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1467{
1468 void *status;
1469 int ret;
1470
3bd1e081
MD
1471 if (consumer_data->pid != 0) {
1472 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1473 if (ret) {
3bd1e081 1474 ERR("Error killing consumer daemon");
cf3af59e
MD
1475 return ret;
1476 }
3bd1e081 1477 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1478 } else {
1479 return 0;
1480 }
1481}
1482
8c0faa1d 1483/*
3bd1e081 1484 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1485 *
d063d709 1486 * Return pid if successful else -1.
8c0faa1d 1487 */
3bd1e081 1488static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1489{
1490 int ret;
1491 pid_t pid;
94c55f17 1492 const char *consumer_to_use;
53086306 1493 const char *verbosity;
94c55f17 1494 struct stat st;
8c0faa1d 1495
3bd1e081 1496 DBG("Spawning consumerd");
c49dc785 1497
8c0faa1d
DG
1498 pid = fork();
1499 if (pid == 0) {
1500 /*
3bd1e081 1501 * Exec consumerd.
8c0faa1d 1502 */
daee5345 1503 if (opt_verbose_consumer) {
53086306
DG
1504 verbosity = "--verbose";
1505 } else {
1506 verbosity = "--quiet";
1507 }
3bd1e081
MD
1508 switch (consumer_data->type) {
1509 case LTTNG_CONSUMER_KERNEL:
94c55f17 1510 /*
c7704d57
DG
1511 * Find out which consumerd to execute. We will first try the
1512 * 64-bit path, then the sessiond's installation directory, and
1513 * fallback on the 32-bit one,
94c55f17 1514 */
63a799e8
AM
1515 DBG3("Looking for a kernel consumer at these locations:");
1516 DBG3(" 1) %s", consumerd64_bin);
1517 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1518 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1519 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1520 DBG3("Found location #1");
94c55f17 1521 consumer_to_use = consumerd64_bin;
94c55f17 1522 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1523 DBG3("Found location #2");
94c55f17 1524 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1525 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1526 DBG3("Found location #3");
eb1e0bd4 1527 consumer_to_use = consumerd32_bin;
94c55f17 1528 } else {
63a799e8 1529 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1530 break;
1531 }
1532 DBG("Using kernel consumer at: %s", consumer_to_use);
1533 execl(consumer_to_use,
1534 "lttng-consumerd", verbosity, "-k",
1535 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1536 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1537 NULL);
3bd1e081 1538 break;
7753dea8
MD
1539 case LTTNG_CONSUMER64_UST:
1540 {
b1e0b6b6 1541 char *tmpnew = NULL;
8f4905da
MD
1542
1543 if (consumerd64_libdir[0] != '\0') {
1544 char *tmp;
1545 size_t tmplen;
1546
1547 tmp = getenv("LD_LIBRARY_PATH");
1548 if (!tmp) {
1549 tmp = "";
1550 }
1551 tmplen = strlen("LD_LIBRARY_PATH=")
1552 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1553 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1554 if (!tmpnew) {
1555 ret = -ENOMEM;
1556 goto error;
1557 }
1558 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1559 strcat(tmpnew, consumerd64_libdir);
1560 if (tmp[0] != '\0') {
1561 strcat(tmpnew, ":");
1562 strcat(tmpnew, tmp);
1563 }
1564 ret = putenv(tmpnew);
1565 if (ret) {
1566 ret = -errno;
1567 goto error;
1568 }
1569 }
94c55f17 1570 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1571 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1572 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1573 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1574 NULL);
8f4905da
MD
1575 if (consumerd64_libdir[0] != '\0') {
1576 free(tmpnew);
1577 }
1578 if (ret) {
1579 goto error;
1580 }
3bd1e081 1581 break;
7753dea8
MD
1582 }
1583 case LTTNG_CONSUMER32_UST:
1584 {
937dde8e 1585 char *tmpnew = NULL;
8f4905da
MD
1586
1587 if (consumerd32_libdir[0] != '\0') {
1588 char *tmp;
1589 size_t tmplen;
1590
1591 tmp = getenv("LD_LIBRARY_PATH");
1592 if (!tmp) {
1593 tmp = "";
1594 }
1595 tmplen = strlen("LD_LIBRARY_PATH=")
1596 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1597 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1598 if (!tmpnew) {
1599 ret = -ENOMEM;
1600 goto error;
1601 }
1602 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1603 strcat(tmpnew, consumerd32_libdir);
1604 if (tmp[0] != '\0') {
1605 strcat(tmpnew, ":");
1606 strcat(tmpnew, tmp);
1607 }
1608 ret = putenv(tmpnew);
1609 if (ret) {
1610 ret = -errno;
1611 goto error;
1612 }
1613 }
94c55f17 1614 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1615 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1616 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1617 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1618 NULL);
8f4905da
MD
1619 if (consumerd32_libdir[0] != '\0') {
1620 free(tmpnew);
1621 }
1622 if (ret) {
1623 goto error;
1624 }
7753dea8
MD
1625 break;
1626 }
3bd1e081 1627 default:
76d7553f 1628 PERROR("unknown consumer type");
3bd1e081
MD
1629 exit(EXIT_FAILURE);
1630 }
8c0faa1d 1631 if (errno != 0) {
76d7553f 1632 PERROR("kernel start consumer exec");
8c0faa1d
DG
1633 }
1634 exit(EXIT_FAILURE);
1635 } else if (pid > 0) {
1636 ret = pid;
8c0faa1d 1637 } else {
76d7553f 1638 PERROR("start consumer fork");
8c0faa1d 1639 ret = -errno;
8c0faa1d 1640 }
8f4905da 1641error:
8c0faa1d
DG
1642 return ret;
1643}
1644
693bd40b 1645/*
3bd1e081 1646 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1647 */
3bd1e081 1648static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1649{
1650 int ret;
1651
3bd1e081
MD
1652 pthread_mutex_lock(&consumer_data->pid_mutex);
1653 if (consumer_data->pid != 0) {
1654 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1655 goto end;
1656 }
693bd40b 1657
3bd1e081 1658 ret = spawn_consumerd(consumer_data);
c49dc785 1659 if (ret < 0) {
3bd1e081
MD
1660 ERR("Spawning consumerd failed");
1661 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1662 goto error;
693bd40b 1663 }
c49dc785 1664
3bd1e081
MD
1665 /* Setting up the consumer_data pid */
1666 consumer_data->pid = ret;
48842b30 1667 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1668 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1669
3bd1e081
MD
1670 DBG2("Spawning consumer control thread");
1671 ret = spawn_consumer_thread(consumer_data);
693bd40b 1672 if (ret < 0) {
3bd1e081 1673 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1674 goto error;
1675 }
1676
c49dc785 1677end:
693bd40b
DG
1678 return 0;
1679
1680error:
1681 return ret;
1682}
1683
b73401da 1684/*
096102bd 1685 * Check version of the lttng-modules.
b73401da 1686 */
096102bd 1687static int validate_lttng_modules_version(void)
b73401da 1688{
096102bd 1689 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD
1690}
1691
b73401da 1692/*
096102bd 1693 * Setup necessary data for kernel tracer action.
b73401da 1694 */
096102bd 1695static int init_kernel_tracer(void)
b73401da
DG
1696{
1697 int ret;
b73401da 1698
096102bd
DG
1699 /* Modprobe lttng kernel modules */
1700 ret = modprobe_lttng_control();
b73401da 1701 if (ret < 0) {
b73401da
DG
1702 goto error;
1703 }
1704
096102bd
DG
1705 /* Open debugfs lttng */
1706 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1707 if (kernel_tracer_fd < 0) {
1708 DBG("Failed to open %s", module_proc_lttng);
1709 ret = -1;
1710 goto error_open;
b73401da
DG
1711 }
1712
096102bd
DG
1713 /* Validate kernel version */
1714 ret = validate_lttng_modules_version();
b73401da 1715 if (ret < 0) {
096102bd 1716 goto error_version;
b73401da
DG
1717 }
1718
096102bd 1719 ret = modprobe_lttng_data();
b73401da 1720 if (ret < 0) {
096102bd 1721 goto error_modules;
8c0faa1d
DG
1722 }
1723
f3ed775e 1724 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG
1725 return 0;
1726
1727error_version:
1728 modprobe_remove_lttng_control();
76d7553f
MD
1729 ret = close(kernel_tracer_fd);
1730 if (ret) {
1731 PERROR("close");
1732 }
1733 kernel_tracer_fd = -1;
096102bd
DG
1734 return LTTCOMM_KERN_VERSION;
1735
1736error_modules:
76d7553f
MD
1737 ret = close(kernel_tracer_fd);
1738 if (ret) {
1739 PERROR("close");
1740 }
096102bd
DG
1741
1742error_open:
1743 modprobe_remove_lttng_control();
b73401da
DG
1744
1745error:
b73401da 1746 WARN("No kernel tracer available");
a4b35e07 1747 kernel_tracer_fd = -1;
531d29f9
MD
1748 if (!is_root) {
1749 return LTTCOMM_NEED_ROOT_SESSIOND;
1750 } else {
1751 return LTTCOMM_KERN_NA;
1752 }
f3ed775e 1753}
33a2b854 1754
f3ed775e 1755/*
54d01ffb 1756 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1757 */
54d01ffb 1758static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1759{
f40799e8 1760 int ret = 0;
8c0faa1d 1761
00e2e675 1762 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
d9800920 1763 /*
54d01ffb 1764 * Assign default kernel consumer socket if no consumer assigned to the
03550b58 1765 * kernel session. At this point, it's NOT supposed to be -1 but this is
54d01ffb 1766 * an extra security check.
d9800920 1767 */
03550b58 1768 if (session->consumer_fd < 0) {
3bd1e081 1769 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1770 }
1771
00e2e675 1772 ret = kernel_consumer_send_session(session->consumer_fd, session);
f3ed775e 1773 if (ret < 0) {
f3ed775e
DG
1774 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1775 goto error;
1776 }
00e2e675 1777 }
1d4b027a 1778
00e2e675
DG
1779error:
1780 return ret;
1781}
1782
1783/*
1784 * Create a socket to the relayd using the URI.
1785 *
1786 * On success, the relayd_sock pointer is set to the created socket.
1787 * Else, it is untouched and an lttcomm error code is returned.
1788 */
1789static int create_connect_relayd(struct consumer_output *output,
1790 const char *session_name, struct lttng_uri *uri,
1791 struct lttcomm_sock **relayd_sock)
1792{
1793 int ret;
1794 struct lttcomm_sock *sock;
1795
1796 /* Create socket object from URI */
1797 sock = lttcomm_alloc_sock_from_uri(uri);
1798 if (sock == NULL) {
1799 ret = LTTCOMM_FATAL;
1800 goto error;
1801 }
1802
1803 ret = lttcomm_create_sock(sock);
1804 if (ret < 0) {
1805 ret = LTTCOMM_FATAL;
1806 goto error;
1807 }
1808
1809 /* Connect to relayd so we can proceed with a session creation. */
1810 ret = relayd_connect(sock);
1811 if (ret < 0) {
1812 ERR("Unable to reach lttng-relayd");
1813 ret = LTTCOMM_RELAYD_SESSION_FAIL;
1814 goto free_sock;
f3ed775e 1815 }
1d4b027a 1816
00e2e675
DG
1817 /* Create socket for control stream. */
1818 if (uri->stype == LTTNG_STREAM_CONTROL) {
1819 DBG3("Creating relayd stream socket from URI");
1820
1821 /* Check relayd version */
1822 ret = relayd_version_check(sock, LTTNG_UST_COMM_MAJOR, 0);
1823 if (ret < 0) {
1824 ret = LTTCOMM_RELAYD_VERSION_FAIL;
1825 goto close_sock;
1826 }
1827 } else if (uri->stype == LTTNG_STREAM_DATA) {
1828 DBG3("Creating relayd data socket from URI");
1829 } else {
1830 /* Command is not valid */
1831 ERR("Relayd invalid stream type: %d", uri->stype);
1832 ret = LTTCOMM_INVALID;
1833 goto close_sock;
1834 }
1835
1836 *relayd_sock = sock;
1837
1838 return LTTCOMM_OK;
1839
1840close_sock:
1841 if (sock) {
1842 (void) relayd_close(sock);
1843 }
1844free_sock:
1845 if (sock) {
1846 lttcomm_destroy_sock(sock);
1847 }
1848error:
1849 return ret;
1850}
1851
1852/*
1853 * Connect to the relayd using URI and send the socket to the right consumer.
1854 */
1855static int send_socket_relayd_consumer(int domain, struct ltt_session *session,
1856 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
1857 int consumer_fd)
1858{
1859 int ret;
1860 struct lttcomm_sock *sock = NULL;
1861
1862 /* Set the network sequence index if not set. */
1863 if (consumer->net_seq_index == -1) {
1864 /*
1865 * Increment net_seq_idx because we are about to transfer the
1866 * new relayd socket to the consumer.
1867 */
1868 uatomic_inc(&relayd_net_seq_idx);
1869 /* Assign unique key so the consumer can match streams */
1870 consumer->net_seq_index = uatomic_read(&relayd_net_seq_idx);
1871 }
1872
1873 /* Connect to relayd and make version check if uri is the control. */
1874 ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock);
1875 if (ret != LTTCOMM_OK) {
1876 goto close_sock;
1877 }
1878
1879 /* If the control socket is connected, network session is ready */
1880 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
1881 session->net_handle = 1;
1882 }
1883
1884 switch (domain) {
1885 case LTTNG_DOMAIN_KERNEL:
1886 /* Send relayd socket to consumer. */
1887 ret = kernel_consumer_send_relayd_socket(consumer_fd, sock,
1888 consumer, relayd_uri->stype);
1889 if (ret < 0) {
1890 ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
1891 goto close_sock;
1892 }
1893 break;
1894 case LTTNG_DOMAIN_UST:
1895 /* Send relayd socket to consumer. */
1896 ret = ust_consumer_send_relayd_socket(consumer_fd, sock,
1897 consumer, relayd_uri->stype);
1898 if (ret < 0) {
1899 ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
1900 goto close_sock;
1901 }
1902 break;
1903 }
1904
1905 ret = LTTCOMM_OK;
1906
1907 /*
1908 * Close socket which was dup on the consumer side. The session daemon does
1909 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1910 */
1911
1912close_sock:
1913 if (sock) {
1914 (void) relayd_close(sock);
1915 lttcomm_destroy_sock(sock);
1916 }
1917
1918 return ret;
1919}
1920
1921/*
1922 * Send both relayd sockets to a specific consumer and domain. This is a
1923 * helper function to facilitate sending the information to the consumer for a
1924 * session.
1925 */
1926static int send_sockets_relayd_consumer(int domain,
1927 struct ltt_session *session, struct consumer_output *consumer, int fd)
1928{
1929 int ret;
1930
1931 /* Sending control relayd socket. */
1932 ret = send_socket_relayd_consumer(domain, session,
1933 &consumer->dst.net.control, consumer, fd);
1934 if (ret != LTTCOMM_OK) {
1935 goto error;
1936 }
1937
1938 /* Sending data relayd socket. */
1939 ret = send_socket_relayd_consumer(domain, session,
1940 &consumer->dst.net.data, consumer, fd);
1941 if (ret != LTTCOMM_OK) {
1942 goto error;
1943 }
1944
1945error:
1946 return ret;
1947}
1948
1949/*
1950 * Setup relayd connections for a tracing session. First creates the socket to
1951 * the relayd and send them to the right domain consumer. Consumer type MUST be
1952 * network.
1953 */
1954static int setup_relayd(struct ltt_session *session)
1955{
1956 int ret = LTTCOMM_OK;
1957 struct ltt_ust_session *usess;
1958 struct ltt_kernel_session *ksess;
1959
1960 assert(session);
1961
1962 usess = session->ust_session;
1963 ksess = session->kernel_session;
1964
1965 DBG2("Setting relayd for session %s", session->name);
1966
1967 if (usess && usess->consumer->sock == -1 &&
1968 usess->consumer->type == CONSUMER_DST_NET &&
1969 usess->consumer->enabled) {
1970 /* Setup relayd for 64 bits consumer */
1971 if (ust_consumerd64_fd >= 0) {
1972 send_sockets_relayd_consumer(LTTNG_DOMAIN_UST, session,
1973 usess->consumer, ust_consumerd64_fd);
1974 if (ret != LTTCOMM_OK) {
1975 goto error;
1976 }
1977 }
1978
1979 /* Setup relayd for 32 bits consumer */
1980 if (ust_consumerd32_fd >= 0) {
1981 send_sockets_relayd_consumer(LTTNG_DOMAIN_UST, session,
1982 usess->consumer, ust_consumerd32_fd);
1983 if (ret != LTTCOMM_OK) {
1984 goto error;
1985 }
1986 }
1987 } else if (ksess && ksess->consumer->sock == -1 &&
1988 ksess->consumer->type == CONSUMER_DST_NET &&
1989 ksess->consumer->enabled) {
1990 send_sockets_relayd_consumer(LTTNG_DOMAIN_KERNEL, session,
1991 ksess->consumer, ksess->consumer_fd);
1992 if (ret != LTTCOMM_OK) {
1993 goto error;
1994 }
1995 }
1996
1997error:
1998 return ret;
1999}
2000
2001/*
2002 * Copy consumer output from the tracing session to the domain session. The
2003 * function also applies the right modification on a per domain basis for the
2004 * trace files destination directory.
2005 */
2006static int copy_session_consumer(int domain, struct ltt_session *session)
2007{
2008 int ret;
2009 const char *dir_name;
2010 struct consumer_output *consumer;
2011
2012 switch (domain) {
2013 case LTTNG_DOMAIN_KERNEL:
2014 DBG3("Copying tracing session consumer output in kernel session");
2015 session->kernel_session->consumer =
2016 consumer_copy_output(session->consumer);
2017 /* Ease our life a bit for the next part */
2018 consumer = session->kernel_session->consumer;
2019 dir_name = DEFAULT_KERNEL_TRACE_DIR;
2020 break;
2021 case LTTNG_DOMAIN_UST:
2022 DBG3("Copying tracing session consumer output in UST session");
2023 session->ust_session->consumer =
2024 consumer_copy_output(session->consumer);
2025 /* Ease our life a bit for the next part */
2026 consumer = session->ust_session->consumer;
2027 dir_name = DEFAULT_UST_TRACE_DIR;
2028 break;
2029 default:
2030 ret = LTTCOMM_UNKNOWN_DOMAIN;
2031 goto error;
2032 }
2033
2034 /* Append correct directory to subdir */
2035 strncat(consumer->subdir, dir_name, sizeof(consumer->subdir));
2036 DBG3("Copy session consumer subdir %s", consumer->subdir);
2037
2038 /* Add default trace directory name */
2039 if (consumer->type == CONSUMER_DST_LOCAL) {
2040 strncat(consumer->dst.trace_path, dir_name,
2041 sizeof(consumer->dst.trace_path));
2042 }
2043
2044 ret = LTTCOMM_OK;
2045
1d4b027a
DG
2046error:
2047 return ret;
8c0faa1d
DG
2048}
2049
0177d773
DG
2050/*
2051 * Create an UST session and add it to the session ust list.
2052 */
44d3bd01 2053static int create_ust_session(struct ltt_session *session,
6df2e2c9 2054 struct lttng_domain *domain)
0177d773 2055{
6df2e2c9 2056 int ret;
00e2e675
DG
2057 struct ltt_ust_session *lus = NULL;
2058
2059 assert(session);
2060 assert(session->consumer);
44d3bd01
DG
2061
2062 switch (domain->type) {
48842b30 2063 case LTTNG_DOMAIN_UST:
44d3bd01
DG
2064 break;
2065 default:
00e2e675 2066 ERR("Unknown UST domain on create session %d", domain->type);
13384287 2067 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
2068 goto error;
2069 }
0177d773
DG
2070
2071 DBG("Creating UST session");
2072
a991f516 2073 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 2074 if (lus == NULL) {
44d3bd01 2075 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
2076 goto error;
2077 }
2078
00e2e675
DG
2079 if (session->consumer->type == CONSUMER_DST_LOCAL) {
2080 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
2081 session->uid, session->gid);
2082 if (ret < 0) {
2083 if (ret != -EEXIST) {
2084 ERR("Trace directory creation error");
2085 ret = LTTCOMM_UST_SESS_FAIL;
2086 goto error;
2087 }
0177d773
DG
2088 }
2089 }
2090
6df2e2c9
MD
2091 lus->uid = session->uid;
2092 lus->gid = session->gid;
f6a9efaa 2093 session->ust_session = lus;
44d3bd01 2094
00e2e675
DG
2095 /* Copy session output to the newly created UST session */
2096 ret = copy_session_consumer(domain->type, session);
2097 if (ret != LTTCOMM_OK) {
2098 goto error;
2099 }
2100
44d3bd01 2101 return LTTCOMM_OK;
0177d773
DG
2102
2103error:
2104 free(lus);
00e2e675 2105 session->ust_session = NULL;
0177d773
DG
2106 return ret;
2107}
2108
333f285e 2109/*
d063d709 2110 * Create a kernel tracer session then create the default channel.
333f285e 2111 */
6df2e2c9 2112static int create_kernel_session(struct ltt_session *session)
333f285e 2113{
f3ed775e 2114 int ret;
f3ed775e
DG
2115
2116 DBG("Creating kernel session");
2117
2118 ret = kernel_create_session(session, kernel_tracer_fd);
2119 if (ret < 0) {
2120 ret = LTTCOMM_KERN_SESS_FAIL;
2121 goto error;
333f285e
DG
2122 }
2123
d9800920 2124 /* Set kernel consumer socket fd */
03550b58 2125 if (kconsumer_data.cmd_sock >= 0) {
3bd1e081 2126 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
2127 }
2128
00e2e675
DG
2129 /* Copy session output to the newly created Kernel session */
2130 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
2131 if (ret != LTTCOMM_OK) {
2132 goto error;
2133 }
2134
2135 /* Create directory(ies) on local filesystem. */
2136 if (session->consumer->type == CONSUMER_DST_LOCAL) {
2137 ret = run_as_mkdir_recursive(
2138 session->kernel_session->consumer->dst.trace_path,
2139 S_IRWXU | S_IRWXG, session->uid, session->gid);
2140 if (ret < 0) {
2141 if (ret != -EEXIST) {
2142 ERR("Trace directory creation error");
2143 goto error;
2144 }
7a485870
DG
2145 }
2146 }
00e2e675 2147
6df2e2c9
MD
2148 session->kernel_session->uid = session->uid;
2149 session->kernel_session->gid = session->gid;
7a485870 2150
00e2e675
DG
2151 return LTTCOMM_OK;
2152
f3ed775e 2153error:
00e2e675
DG
2154 trace_kernel_destroy_session(session->kernel_session);
2155 session->kernel_session = NULL;
f3ed775e 2156 return ret;
333f285e
DG
2157}
2158
8e0af1b4 2159/*
c7704d57
DG
2160 * Check if the UID or GID match the session. Root user has access to all
2161 * sessions.
8e0af1b4 2162 */
c7704d57 2163static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 2164{
c7704d57 2165 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD
2166 return 0;
2167 } else {
2168 return 1;
2169 }
2170}
2171
00e2e675
DG
2172/*
2173 * Count number of session permitted by uid/gid.
2174 */
8e0af1b4
MD
2175static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2176{
2177 unsigned int i = 0;
2178 struct ltt_session *session;
2179
2180 DBG("Counting number of available session for UID %d GID %d",
2181 uid, gid);
2182 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2183 /*
2184 * Only list the sessions the user can control.
2185 */
2186 if (!session_access_ok(session, uid, gid)) {
2187 continue;
2188 }
2189 i++;
2190 }
2191 return i;
2192}
2193
6c9cc2ab
DG
2194/*
2195 * Using the session list, filled a lttng_session array to send back to the
2196 * client for session listing.
2197 *
2198 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 2199 * session_lock_list() and session_unlock_list().
6c9cc2ab 2200 */
c7704d57
DG
2201static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2202 gid_t gid)
6c9cc2ab 2203{
8e0af1b4 2204 unsigned int i = 0;
6c9cc2ab
DG
2205 struct ltt_session *session;
2206
8e0af1b4
MD
2207 DBG("Getting all available session for UID %d GID %d",
2208 uid, gid);
6c9cc2ab
DG
2209 /*
2210 * Iterate over session list and append data after the control struct in
2211 * the buffer.
2212 */
2213 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD
2214 /*
2215 * Only list the sessions the user can control.
2216 */
2217 if (!session_access_ok(session, uid, gid)) {
2218 continue;
2219 }
6c9cc2ab 2220 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 2221 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 2222 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 2223 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 2224 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
2225 i++;
2226 }
2227}
2228
9f19cc17
DG
2229/*
2230 * Fill lttng_channel array of all channels.
2231 */
b551a063 2232static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
2233 struct lttng_channel *channels)
2234{
2235 int i = 0;
2236 struct ltt_kernel_channel *kchan;
2237
2238 DBG("Listing channels for session %s", session->name);
2239
b551a063
DG
2240 switch (domain) {
2241 case LTTNG_DOMAIN_KERNEL:
2242 /* Kernel channels */
2243 if (session->kernel_session != NULL) {
2244 cds_list_for_each_entry(kchan,
2245 &session->kernel_session->channel_list.head, list) {
2246 /* Copy lttng_channel struct to array */
2247 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2248 channels[i].enabled = kchan->enabled;
2249 i++;
2250 }
2251 }
2252 break;
2253 case LTTNG_DOMAIN_UST:
2254 {
bec39940 2255 struct lttng_ht_iter iter;
b551a063
DG
2256 struct ltt_ust_channel *uchan;
2257
bec39940
DG
2258 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2259 &iter.iter, uchan, node.node) {
b551a063
DG
2260 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2261 channels[i].attr.overwrite = uchan->attr.overwrite;
2262 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2263 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2264 channels[i].attr.switch_timer_interval =
2265 uchan->attr.switch_timer_interval;
2266 channels[i].attr.read_timer_interval =
2267 uchan->attr.read_timer_interval;
aea829b3 2268 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2269 switch (uchan->attr.output) {
2270 case LTTNG_UST_MMAP:
2271 default:
2272 channels[i].attr.output = LTTNG_EVENT_MMAP;
2273 break;
2274 }
befe0905 2275 i++;
b551a063
DG
2276 }
2277 break;
2278 }
2279 default:
2280 break;
2281 }
2282}
2283
2284/*
2285 * Create a list of ust global domain events.
2286 */
2287static int list_lttng_ust_global_events(char *channel_name,
2288 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2289{
2290 int i = 0, ret = 0;
2291 unsigned int nb_event = 0;
bec39940
DG
2292 struct lttng_ht_iter iter;
2293 struct lttng_ht_node_str *node;
b551a063
DG
2294 struct ltt_ust_channel *uchan;
2295 struct ltt_ust_event *uevent;
2296 struct lttng_event *tmp;
2297
2298 DBG("Listing UST global events for channel %s", channel_name);
2299
2300 rcu_read_lock();
2301
bec39940
DG
2302 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2303 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG
2304 if (node == NULL) {
2305 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2306 goto error;
b551a063
DG
2307 }
2308
bec39940 2309 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2310
bec39940 2311 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2312
b551a063
DG
2313 if (nb_event == 0) {
2314 ret = nb_event;
2315 goto error;
2316 }
2317
2318 DBG3("Listing UST global %d events", nb_event);
2319
2320 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2321 if (tmp == NULL) {
2322 ret = -LTTCOMM_FATAL;
2323 goto error;
2324 }
2325
bec39940 2326 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG
2327 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2328 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2329 tmp[i].enabled = uevent->enabled;
2330 switch (uevent->attr.instrumentation) {
2331 case LTTNG_UST_TRACEPOINT:
2332 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2333 break;
2334 case LTTNG_UST_PROBE:
2335 tmp[i].type = LTTNG_EVENT_PROBE;
2336 break;
2337 case LTTNG_UST_FUNCTION:
2338 tmp[i].type = LTTNG_EVENT_FUNCTION;
2339 break;
0cda4f28 2340 }
8005f29a 2341 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2342 switch (uevent->attr.loglevel_type) {
8005f29a 2343 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2344 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2345 break;
8005f29a 2346 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2347 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD
2348 break;
2349 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2350 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2351 break;
9f19cc17 2352 }
d7b75b30 2353 i++;
9f19cc17
DG
2354 }
2355
b551a063
DG
2356 ret = nb_event;
2357 *events = tmp;
2358
2359error:
2360 rcu_read_unlock();
2361 return ret;
9f19cc17
DG
2362}
2363
2364/*
b551a063 2365 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2366 */
b551a063
DG
2367static int list_lttng_kernel_events(char *channel_name,
2368 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2369{
b551a063
DG
2370 int i = 0, ret;
2371 unsigned int nb_event;
9f19cc17 2372 struct ltt_kernel_event *event;
b551a063
DG
2373 struct ltt_kernel_channel *kchan;
2374
2375 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2376 if (kchan == NULL) {
2377 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2378 goto error;
2379 }
2380
2381 nb_event = kchan->event_count;
9f19cc17
DG
2382
2383 DBG("Listing events for channel %s", kchan->channel->name);
2384
b551a063
DG
2385 if (nb_event == 0) {
2386 ret = nb_event;
2387 goto error;
2388 }
2389
2390 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2391 if (*events == NULL) {
2392 ret = LTTCOMM_FATAL;
2393 goto error;
2394 }
2395
9f19cc17
DG
2396 /* Kernel channels */
2397 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2398 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2399 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2400 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2401 switch (event->event->instrumentation) {
2402 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2403 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2404 break;
2405 case LTTNG_KERNEL_KPROBE:
2406 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2407 (*events)[i].type = LTTNG_EVENT_PROBE;
2408 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2409 sizeof(struct lttng_kernel_kprobe));
2410 break;
2411 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2412 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2413 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2414 sizeof(struct lttng_kernel_function));
2415 break;
0133c199 2416 case LTTNG_KERNEL_NOOP:
b551a063 2417 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2418 break;
a54bd42d 2419 case LTTNG_KERNEL_SYSCALL:
b551a063 2420 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2421 break;
7a3d1328
MD
2422 case LTTNG_KERNEL_ALL:
2423 assert(0);
2424 break;
9f19cc17
DG
2425 }
2426 i++;
2427 }
b551a063
DG
2428
2429 return nb_event;
2430
2431error:
2432 return ret;
9f19cc17
DG
2433}
2434
fac6795d 2435/*
54d01ffb 2436 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2437 */
54d01ffb
DG
2438static int cmd_disable_channel(struct ltt_session *session,
2439 int domain, char *channel_name)
fac6795d 2440{
54d01ffb 2441 int ret;
78f0bacd
DG
2442 struct ltt_ust_session *usess;
2443
2444 usess = session->ust_session;
379473d2 2445
54d01ffb 2446 switch (domain) {
78f0bacd
DG
2447 case LTTNG_DOMAIN_KERNEL:
2448 {
2449 ret = channel_kernel_disable(session->kernel_session,
2450 channel_name);
2451 if (ret != LTTCOMM_OK) {
2452 goto error;
2453 }
54d01ffb 2454
78f0bacd
DG
2455 kernel_wait_quiescent(kernel_tracer_fd);
2456 break;
2457 }
2458 case LTTNG_DOMAIN_UST:
2459 {
2460 struct ltt_ust_channel *uchan;
bec39940 2461 struct lttng_ht *chan_ht;
78f0bacd 2462
7885e399
DG
2463 chan_ht = usess->domain_global.channels;
2464
2465 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG
2466 if (uchan == NULL) {
2467 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2468 goto error;
78f0bacd
DG
2469 }
2470
7885e399
DG
2471 ret = channel_ust_disable(usess, domain, uchan);
2472 if (ret != LTTCOMM_OK) {
78f0bacd
DG
2473 goto error;
2474 }
78f0bacd
DG
2475 break;
2476 }
d78d6610 2477#if 0
78f0bacd
DG
2478 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2479 case LTTNG_DOMAIN_UST_EXEC_NAME:
2480 case LTTNG_DOMAIN_UST_PID:
d78d6610 2481#endif
78f0bacd
DG
2482 default:
2483 ret = LTTCOMM_UNKNOWN_DOMAIN;
2484 goto error;
20fe2104
DG
2485 }
2486
54d01ffb 2487 ret = LTTCOMM_OK;
d65106b1 2488
54d01ffb
DG
2489error:
2490 return ret;
2491}
2492
2493/*
2494 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2495 */
44d3bd01 2496static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2497 int domain, struct lttng_channel *attr)
54d01ffb
DG
2498{
2499 int ret;
f6a9efaa 2500 struct ltt_ust_session *usess = session->ust_session;
bec39940 2501 struct lttng_ht *chan_ht;
f6a9efaa 2502
5d56b5aa 2503 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2504
aea829b3 2505 switch (domain) {
44d3bd01
DG
2506 case LTTNG_DOMAIN_KERNEL:
2507 {
2508 struct ltt_kernel_channel *kchan;
54d01ffb 2509
44d3bd01
DG
2510 kchan = trace_kernel_get_channel_by_name(attr->name,
2511 session->kernel_session);
2512 if (kchan == NULL) {
2513 ret = channel_kernel_create(session->kernel_session,
2514 attr, kernel_poll_pipe[1]);
2515 } else {
2516 ret = channel_kernel_enable(session->kernel_session, kchan);
2517 }
2518
2519 if (ret != LTTCOMM_OK) {
2520 goto error;
2521 }
2522
2523 kernel_wait_quiescent(kernel_tracer_fd);
2524 break;
2525 }
f6a9efaa
DG
2526 case LTTNG_DOMAIN_UST:
2527 {
2528 struct ltt_ust_channel *uchan;
2529
7885e399 2530 chan_ht = usess->domain_global.channels;
f6a9efaa 2531
7885e399 2532 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2533 if (uchan == NULL) {
7885e399 2534 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2535 } else {
7885e399 2536 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2537 }
f6a9efaa
DG
2538 break;
2539 }
d78d6610 2540#if 0
78f0bacd
DG
2541 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2542 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2543 case LTTNG_DOMAIN_UST_PID:
d78d6610 2544#endif
44d3bd01
DG
2545 default:
2546 ret = LTTCOMM_UNKNOWN_DOMAIN;
2547 goto error;
54d01ffb
DG
2548 }
2549
54d01ffb
DG
2550error:
2551 return ret;
2552}
2553
2554/*
2555 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2556 */
2557static int cmd_disable_event(struct ltt_session *session, int domain,
2558 char *channel_name, char *event_name)
2559{
2560 int ret;
54d01ffb
DG
2561
2562 switch (domain) {
2563 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2564 {
2565 struct ltt_kernel_channel *kchan;
b0a40d28 2566 struct ltt_kernel_session *ksess;
2bdd86d4 2567
b0a40d28
DG
2568 ksess = session->kernel_session;
2569
2570 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2571 if (kchan == NULL) {
2572 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2573 goto error;
d65106b1
DG
2574 }
2575
b0a40d28 2576 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2577 if (ret != LTTCOMM_OK) {
2578 goto error;
2579 }
2580
2581 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2582 break;
2bdd86d4
MD
2583 }
2584 case LTTNG_DOMAIN_UST:
b0a40d28 2585 {
b0a40d28 2586 struct ltt_ust_channel *uchan;
7f79d3a1 2587 struct ltt_ust_session *usess;
b0a40d28
DG
2588
2589 usess = session->ust_session;
2590
2591 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2592 channel_name);
2593 if (uchan == NULL) {
2594 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2595 goto error;
2596 }
2597
7f79d3a1
DG
2598 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2599 if (ret != LTTCOMM_OK) {
b0a40d28
DG
2600 goto error;
2601 }
2602
7f79d3a1 2603 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2604 channel_name);
b0a40d28
DG
2605 break;
2606 }
d78d6610 2607#if 0
2bdd86d4
MD
2608 case LTTNG_DOMAIN_UST_EXEC_NAME:
2609 case LTTNG_DOMAIN_UST_PID:
2610 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2611#endif
54d01ffb 2612 default:
1ab1ea0b 2613 ret = LTTCOMM_UND;
54d01ffb 2614 goto error;
d65106b1 2615 }
26cc6b4e 2616
54d01ffb
DG
2617 ret = LTTCOMM_OK;
2618
2619error:
2620 return ret;
2621}
2622
2623/*
2624 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2625 */
2626static int cmd_disable_event_all(struct ltt_session *session, int domain,
2627 char *channel_name)
2628{
2629 int ret;
54d01ffb
DG
2630
2631 switch (domain) {
2632 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2633 {
2634 struct ltt_kernel_session *ksess;
2635 struct ltt_kernel_channel *kchan;
2636
2637 ksess = session->kernel_session;
2638
2639 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2640 if (kchan == NULL) {
2641 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2642 goto error;
26cc6b4e
DG
2643 }
2644
9730260e 2645 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2646 if (ret != LTTCOMM_OK) {
0b97ec54 2647 goto error;
26cc6b4e
DG
2648 }
2649
54d01ffb 2650 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2651 break;
9730260e
DG
2652 }
2653 case LTTNG_DOMAIN_UST:
2654 {
2655 struct ltt_ust_session *usess;
2656 struct ltt_ust_channel *uchan;
2657
2658 usess = session->ust_session;
2659
2660 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2661 channel_name);
2662 if (uchan == NULL) {
2663 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2664 goto error;
2665 }
2666
7f79d3a1
DG
2667 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2668 if (ret != 0) {
9730260e
DG
2669 goto error;
2670 }
2671
7f79d3a1 2672 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG
2673
2674 break;
2675 }
d78d6610 2676#if 0
9730260e
DG
2677 case LTTNG_DOMAIN_UST_EXEC_NAME:
2678 case LTTNG_DOMAIN_UST_PID:
2679 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2680#endif
54d01ffb 2681 default:
1ab1ea0b 2682 ret = LTTCOMM_UND;
54d01ffb 2683 goto error;
26cc6b4e 2684 }
e953ef25 2685
54d01ffb 2686 ret = LTTCOMM_OK;
e953ef25 2687
54d01ffb
DG
2688error:
2689 return ret;
2690}
f5177a38 2691
54d01ffb
DG
2692/*
2693 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2694 */
2695static int cmd_add_context(struct ltt_session *session, int domain,
2696 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2697{
2698 int ret;
f5177a38 2699
54d01ffb
DG
2700 switch (domain) {
2701 case LTTNG_DOMAIN_KERNEL:
2702 /* Add kernel context to kernel tracer */
2703 ret = context_kernel_add(session->kernel_session, ctx,
2704 event_name, channel_name);
2705 if (ret != LTTCOMM_OK) {
f5177a38 2706 goto error;
e953ef25 2707 }
2bdd86d4
MD
2708 break;
2709 case LTTNG_DOMAIN_UST:
2710 {
55cc08a6 2711 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2712
55cc08a6
DG
2713 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2714 if (ret != LTTCOMM_OK) {
2715 goto error;
2bdd86d4 2716 }
e953ef25 2717 break;
2bdd86d4 2718 }
d78d6610 2719#if 0
55cc08a6
DG
2720 case LTTNG_DOMAIN_UST_EXEC_NAME:
2721 case LTTNG_DOMAIN_UST_PID:
2722 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2723#endif
54d01ffb 2724 default:
1ab1ea0b 2725 ret = LTTCOMM_UND;
54d01ffb 2726 goto error;
e953ef25 2727 }
950131af 2728
54d01ffb 2729 ret = LTTCOMM_OK;
950131af 2730
54d01ffb
DG
2731error:
2732 return ret;
2733}
2734
53a80697
MD
2735/*
2736 * Command LTTNG_SET_FILTER processed by the client thread.
2737 */
2738static int cmd_set_filter(struct ltt_session *session, int domain,
2739 char *channel_name, char *event_name,
2740 struct lttng_filter_bytecode *bytecode)
2741{
2742 int ret;
2743
2744 switch (domain) {
2745 case LTTNG_DOMAIN_KERNEL:
2746 ret = LTTCOMM_FATAL;
2747 break;
2748 case LTTNG_DOMAIN_UST:
2749 {
2750 struct ltt_ust_session *usess = session->ust_session;
2751
2752 ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name);
2753 if (ret != LTTCOMM_OK) {
2754 goto error;
2755 }
2756 break;
2757 }
2758#if 0
2759 case LTTNG_DOMAIN_UST_EXEC_NAME:
2760 case LTTNG_DOMAIN_UST_PID:
2761 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2762#endif
2763 default:
2764 ret = LTTCOMM_UND;
2765 goto error;
2766 }
2767
2768 ret = LTTCOMM_OK;
2769
2770error:
2771 return ret;
2772
2773}
2774
54d01ffb
DG
2775/*
2776 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2777 */
2778static int cmd_enable_event(struct ltt_session *session, int domain,
2779 char *channel_name, struct lttng_event *event)
2780{
2781 int ret;
f6cd6b0f 2782 struct lttng_channel *attr;
48842b30 2783 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2784
2785 switch (domain) {
2786 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2787 {
2788 struct ltt_kernel_channel *kchan;
2789
54d01ffb
DG
2790 kchan = trace_kernel_get_channel_by_name(channel_name,
2791 session->kernel_session);
2792 if (kchan == NULL) {
f6cd6b0f
DG
2793 attr = channel_new_default_attr(domain);
2794 if (attr == NULL) {
2795 ret = LTTCOMM_FATAL;
2796 goto error;
2797 }
2798 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2799
54d01ffb 2800 /* This call will notify the kernel thread */
44d3bd01 2801 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2802 attr, kernel_poll_pipe[1]);
54d01ffb 2803 if (ret != LTTCOMM_OK) {
ff4d74e6 2804 free(attr);
f5177a38
DG
2805 goto error;
2806 }
ff4d74e6 2807 free(attr);
54d01ffb 2808 }
950131af 2809
54d01ffb
DG
2810 /* Get the newly created kernel channel pointer */
2811 kchan = trace_kernel_get_channel_by_name(channel_name,
2812 session->kernel_session);
2813 if (kchan == NULL) {
2814 /* This sould not happen... */
2815 ret = LTTCOMM_FATAL;
2816 goto error;
2817 }
f5177a38 2818
48842b30
DG
2819 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2820 event);
54d01ffb 2821 if (ret != LTTCOMM_OK) {
f5177a38 2822 goto error;
950131af
DG
2823 }
2824
54d01ffb 2825 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2826 break;
2bdd86d4
MD
2827 }
2828 case LTTNG_DOMAIN_UST:
2829 {
aea829b3 2830 struct lttng_channel *attr;
edb67388 2831 struct ltt_ust_channel *uchan;
2bdd86d4 2832
edb67388 2833 /* Get channel from global UST domain */
48842b30
DG
2834 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2835 channel_name);
2836 if (uchan == NULL) {
aea829b3
DG
2837 /* Create default channel */
2838 attr = channel_new_default_attr(domain);
2839 if (attr == NULL) {
2840 ret = LTTCOMM_FATAL;
2841 goto error;
2842 }
596219f7 2843 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2844 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2845
7885e399 2846 ret = channel_ust_create(usess, domain, attr);
edb67388 2847 if (ret != LTTCOMM_OK) {
ff4d74e6 2848 free(attr);
aea829b3
DG
2849 goto error;
2850 }
aea829b3
DG
2851 free(attr);
2852
2853 /* Get the newly created channel reference back */
2854 uchan = trace_ust_find_channel_by_name(
2855 usess->domain_global.channels, channel_name);
2856 if (uchan == NULL) {
2857 /* Something is really wrong */
2858 ret = LTTCOMM_FATAL;
2859 goto error;
2860 }
48842b30 2861 }
2bdd86d4 2862
edb67388 2863 /* At this point, the session and channel exist on the tracer */
edb67388
DG
2864 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2865 if (ret != LTTCOMM_OK) {
48842b30 2866 goto error;
2bdd86d4
MD
2867 }
2868 break;
2869 }
d78d6610 2870#if 0
2bdd86d4
MD
2871 case LTTNG_DOMAIN_UST_EXEC_NAME:
2872 case LTTNG_DOMAIN_UST_PID:
2873 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2874#endif
54d01ffb 2875 default:
1ab1ea0b 2876 ret = LTTCOMM_UND;
54d01ffb 2877 goto error;
950131af 2878 }
d36b8583 2879
54d01ffb 2880 ret = LTTCOMM_OK;
d36b8583 2881
54d01ffb
DG
2882error:
2883 return ret;
2884}
7d29a247 2885
54d01ffb
DG
2886/*
2887 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2888 */
2889static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2890 char *channel_name, int event_type)
54d01ffb
DG
2891{
2892 int ret;
2893 struct ltt_kernel_channel *kchan;
7d29a247 2894
54d01ffb
DG
2895 switch (domain) {
2896 case LTTNG_DOMAIN_KERNEL:
2897 kchan = trace_kernel_get_channel_by_name(channel_name,
2898 session->kernel_session);
2899 if (kchan == NULL) {
2900 /* This call will notify the kernel thread */
44d3bd01
DG
2901 ret = channel_kernel_create(session->kernel_session, NULL,
2902 kernel_poll_pipe[1]);
54d01ffb
DG
2903 if (ret != LTTCOMM_OK) {
2904 goto error;
d36b8583 2905 }
0d0c377a 2906
8f69e5eb
DG
2907 /* Get the newly created kernel channel pointer */
2908 kchan = trace_kernel_get_channel_by_name(channel_name,
2909 session->kernel_session);
2910 if (kchan == NULL) {
2911 /* This sould not happen... */
2912 ret = LTTCOMM_FATAL;
2913 goto error;
2914 }
2915
54d01ffb 2916 }
0fdd1e2c 2917
7a3d1328 2918 switch (event_type) {
76d45b40 2919 case LTTNG_EVENT_SYSCALL:
7a3d1328 2920 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2921 kchan, kernel_tracer_fd);
7a3d1328 2922 break;
76d45b40 2923 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2924 /*
7a3d1328
MD
2925 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2926 * events already registered to the channel.
8c9ae521 2927 */
7a3d1328
MD
2928 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2929 kchan, kernel_tracer_fd);
2930 break;
76d45b40 2931 case LTTNG_EVENT_ALL:
7a3d1328 2932 /* Enable syscalls and tracepoints */
8c9ae521
DG
2933 ret = event_kernel_enable_all(session->kernel_session,
2934 kchan, kernel_tracer_fd);
7a3d1328
MD
2935 break;
2936 default:
2937 ret = LTTCOMM_KERN_ENABLE_FAIL;
2938 goto error;
8c9ae521 2939 }
8f69e5eb
DG
2940
2941 /* Manage return value */
54d01ffb 2942 if (ret != LTTCOMM_OK) {
0d0c377a 2943 goto error;
d36b8583
DG
2944 }
2945
54d01ffb 2946 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2947 break;
76d45b40
DG
2948 case LTTNG_DOMAIN_UST:
2949 {
2950 struct lttng_channel *attr;
2951 struct ltt_ust_channel *uchan;
2952 struct ltt_ust_session *usess = session->ust_session;
2953
2954 /* Get channel from global UST domain */
2955 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2956 channel_name);
2957 if (uchan == NULL) {
2958 /* Create default channel */
2959 attr = channel_new_default_attr(domain);
2960 if (attr == NULL) {
2961 ret = LTTCOMM_FATAL;
2962 goto error;
2963 }
2964 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2965 attr->name[NAME_MAX - 1] = '\0';
2966
2967 /* Use the internal command enable channel */
7885e399 2968 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG
2969 if (ret != LTTCOMM_OK) {
2970 free(attr);
2971 goto error;
2972 }
2973 free(attr);
2974
2975 /* Get the newly created channel reference back */
2976 uchan = trace_ust_find_channel_by_name(
2977 usess->domain_global.channels, channel_name);
2978 if (uchan == NULL) {
2979 /* Something is really wrong */
2980 ret = LTTCOMM_FATAL;
2981 goto error;
2982 }
2983 }
2984
2985 /* At this point, the session and channel exist on the tracer */
2986
2987 switch (event_type) {
2988 case LTTNG_EVENT_ALL:
2989 case LTTNG_EVENT_TRACEPOINT:
2990 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2991 if (ret != LTTCOMM_OK) {
2992 goto error;
2993 }
2994 break;
2995 default:
2996 ret = LTTCOMM_UST_ENABLE_FAIL;
2997 goto error;
2998 }
2999
3000 /* Manage return value */
3001 if (ret != LTTCOMM_OK) {
3002 goto error;
3003 }
3004
3005 break;
3006 }
d78d6610 3007#if 0
76d45b40
DG
3008 case LTTNG_DOMAIN_UST_EXEC_NAME:
3009 case LTTNG_DOMAIN_UST_PID:
3010 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 3011#endif
54d01ffb 3012 default:
1ab1ea0b 3013 ret = LTTCOMM_UND;
54d01ffb 3014 goto error;
d36b8583 3015 }
f3ed775e 3016
54d01ffb
DG
3017 ret = LTTCOMM_OK;
3018
3019error:
3020 return ret;
3021}
3022
3023/*
3024 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
3025 */
3026static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
3027{
3028 int ret;
3029 ssize_t nb_events = 0;
3030
3031 switch (domain) {
3032 case LTTNG_DOMAIN_KERNEL:
3033 nb_events = kernel_list_events(kernel_tracer_fd, events);
3034 if (nb_events < 0) {
3035 ret = LTTCOMM_KERN_LIST_FAIL;
3036 goto error;
894be886 3037 }
54d01ffb 3038 break;
b551a063
DG
3039 case LTTNG_DOMAIN_UST:
3040 nb_events = ust_app_list_events(events);
3041 if (nb_events < 0) {
3042 ret = LTTCOMM_UST_LIST_FAIL;
3043 goto error;
3044 }
3045 break;
54d01ffb 3046 default:
1ab1ea0b 3047 ret = LTTCOMM_UND;
54d01ffb
DG
3048 goto error;
3049 }
894be886 3050
54d01ffb 3051 return nb_events;
7d29a247 3052
54d01ffb
DG
3053error:
3054 /* Return negative value to differentiate return code */
3055 return -ret;
3056}
b389abbe 3057
f37d259d
MD
3058/*
3059 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
3060 */
3061static ssize_t cmd_list_tracepoint_fields(int domain,
3062 struct lttng_event_field **fields)
3063{
3064 int ret;
3065 ssize_t nb_fields = 0;
3066
3067 switch (domain) {
3068 case LTTNG_DOMAIN_UST:
3069 nb_fields = ust_app_list_event_fields(fields);
3070 if (nb_fields < 0) {
3071 ret = LTTCOMM_UST_LIST_FAIL;
3072 goto error;
3073 }
3074 break;
3075 case LTTNG_DOMAIN_KERNEL:
3076 default: /* fall-through */
3077 ret = LTTCOMM_UND;
3078 goto error;
3079 }
3080
3081 return nb_fields;
3082
3083error:
3084 /* Return negative value to differentiate return code */
3085 return -ret;
3086}
3087
54d01ffb
DG
3088/*
3089 * Command LTTNG_START_TRACE processed by the client thread.
3090 */
3091static int cmd_start_trace(struct ltt_session *session)
3092{
3093 int ret;
54d01ffb 3094 struct ltt_kernel_session *ksession;
b9d9b220 3095 struct ltt_ust_session *usess;
00e2e675 3096 struct ltt_kernel_channel *kchan;
b389abbe 3097
00e2e675 3098 /* Ease our life a bit ;) */
54d01ffb 3099 ksession = session->kernel_session;
b9d9b220 3100 usess = session->ust_session;
5eb91c98 3101
b9ef1c83 3102 if (session->enabled) {
80e327fa
DG
3103 /* Already started. */
3104 ret = LTTCOMM_TRACE_ALREADY_STARTED;
b9ef1c83
DG
3105 goto error;
3106 }
3107
464dd62d
MD
3108 session->enabled = 1;
3109
00e2e675
DG
3110 ret = setup_relayd(session);
3111 if (ret != LTTCOMM_OK) {
3112 ERR("Error setting up relayd for session %s", session->name);
3113 goto error;
3114 }
3115
54d01ffb
DG
3116 /* Kernel tracing */
3117 if (ksession != NULL) {
3118 /* Open kernel metadata */
3119 if (ksession->metadata == NULL) {
00e2e675
DG
3120 ret = kernel_open_metadata(ksession,
3121 ksession->consumer->dst.trace_path);
54d01ffb
DG
3122 if (ret < 0) {
3123 ret = LTTCOMM_KERN_META_FAIL;
3124 goto error;
b389abbe 3125 }
54d01ffb 3126 }
7d29a247 3127
54d01ffb 3128 /* Open kernel metadata stream */
03550b58 3129 if (ksession->metadata_stream_fd < 0) {
54d01ffb
DG
3130 ret = kernel_open_metadata_stream(ksession);
3131 if (ret < 0) {
3132 ERR("Kernel create metadata stream failed");
3133 ret = LTTCOMM_KERN_STREAM_FAIL;
3134 goto error;
3135 }
3136 }
3137
3138 /* For each channel */
3139 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
3140 if (kchan->stream_count == 0) {
3141 ret = kernel_open_channel_stream(kchan);
3142 if (ret < 0) {
3143 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
3144 goto error;
3145 }
54d01ffb
DG
3146 /* Update the stream global counter */
3147 ksession->stream_count_global += ret;
7d29a247 3148 }
54d01ffb
DG
3149 }
3150
3151 /* Setup kernel consumer socket and send fds to it */
3152 ret = init_kernel_tracing(ksession);
3153 if (ret < 0) {
3154 ret = LTTCOMM_KERN_START_FAIL;
3155 goto error;
3156 }
3157
3158 /* This start the kernel tracing */
3159 ret = kernel_start_session(ksession);
3160 if (ret < 0) {
3161 ret = LTTCOMM_KERN_START_FAIL;
3162 goto error;
3163 }
3164
3165 /* Quiescent wait after starting trace */
3166 kernel_wait_quiescent(kernel_tracer_fd);
3167 }
3168
36dc12cc 3169 /* Flag session that trace should start automatically */
b9d9b220
DG
3170 if (usess) {
3171 usess->start_trace = 1;
36dc12cc 3172
b9d9b220
DG
3173 ret = ust_app_start_trace_all(usess);
3174 if (ret < 0) {
3175 ret = LTTCOMM_UST_START_FAIL;
3176 goto error;
3177 }
2bdd86d4 3178 }
54d01ffb
DG
3179
3180 ret = LTTCOMM_OK;
3181
3182error:
3183 return ret;
3184}
3185
3186/*
3187 * Command LTTNG_STOP_TRACE processed by the client thread.
3188 */
3189static int cmd_stop_trace(struct ltt_session *session)
3190{
3191 int ret;
3192 struct ltt_kernel_channel *kchan;
3193 struct ltt_kernel_session *ksession;
8be98f9a 3194 struct ltt_ust_session *usess;
54d01ffb
DG
3195
3196 /* Short cut */
3197 ksession = session->kernel_session;
8be98f9a 3198 usess = session->ust_session;
54d01ffb 3199
b9ef1c83 3200 if (!session->enabled) {
80e327fa 3201 ret = LTTCOMM_TRACE_ALREADY_STOPPED;
b9ef1c83
DG
3202 goto error;
3203 }
3204
464dd62d
MD
3205 session->enabled = 0;
3206
54d01ffb
DG
3207 /* Kernel tracer */
3208 if (ksession != NULL) {
3209 DBG("Stop kernel tracing");
3210
00e2e675
DG
3211 /* Flush metadata if exist */
3212 if (ksession->metadata_stream_fd >= 0) {
3213 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
3214 if (ret < 0) {
3215 ERR("Kernel metadata flush failed");
3216 }
54d01ffb 3217 }
f34daff7 3218
00e2e675 3219 /* Flush all buffers before stopping */
54d01ffb
DG
3220 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
3221 ret = kernel_flush_buffer(kchan);
0d0c377a 3222 if (ret < 0) {
54d01ffb 3223 ERR("Kernel flush buffer error");
7d29a247 3224 }
54d01ffb 3225 }
19e70852 3226
54d01ffb
DG
3227 ret = kernel_stop_session(ksession);
3228 if (ret < 0) {
3229 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 3230 goto error;
f3ed775e 3231 }
54d01ffb
DG
3232
3233 kernel_wait_quiescent(kernel_tracer_fd);
894be886 3234 }
54d01ffb 3235
8be98f9a
MD
3236 if (usess) {
3237 usess->start_trace = 0;
2bdd86d4 3238
8be98f9a 3239 ret = ust_app_stop_trace_all(usess);
2bdd86d4 3240 if (ret < 0) {
190df5ac 3241 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD
3242 goto error;
3243 }
2bdd86d4 3244 }
54d01ffb
DG
3245
3246 ret = LTTCOMM_OK;
3247
3248error:
3249 return ret;
3250}
3251
3252/*
00e2e675 3253 * Command LTTNG_CREATE_SESSION_URI processed by the client thread.
54d01ffb 3254 */
00e2e675
DG
3255static int cmd_create_session_uri(char *name, struct lttng_uri *ctrl_uri,
3256 struct lttng_uri *data_uri, unsigned int enable_consumer,
3257 lttng_sock_cred *creds)
54d01ffb
DG
3258{
3259 int ret;
00e2e675
DG
3260 char *path = NULL;
3261 struct ltt_session *session;
3262 struct consumer_output *consumer;
3263
3264 /* Verify if the session already exist */
3265 session = session_find_by_name(name);
3266 if (session != NULL) {
3267 ret = LTTCOMM_EXIST_SESS;
3268 goto error;
3269 }
3270
3271 /* TODO: validate URIs */
3272
3273 /* Create default consumer output */
3274 consumer = consumer_create_output(CONSUMER_DST_LOCAL);
3275 if (consumer == NULL) {
3276 ret = LTTCOMM_FATAL;
3277 goto error;
3278 }
3279 strncpy(consumer->subdir, ctrl_uri->subdir, sizeof(consumer->subdir));
3280 DBG2("Consumer subdir set to %s", consumer->subdir);
3281
3282 switch (ctrl_uri->dtype) {
3283 case LTTNG_DST_IPV4:
3284 case LTTNG_DST_IPV6:
3285 /* Set control URI into consumer output object */
3286 ret = consumer_set_network_uri(consumer, ctrl_uri);
3287 if (ret < 0) {
3288 ret = LTTCOMM_FATAL;
3289 goto error;
3290 }
3291
3292 /* Set data URI into consumer output object */
3293 ret = consumer_set_network_uri(consumer, data_uri);
3294 if (ret < 0) {
3295 ret = LTTCOMM_FATAL;
3296 goto error;
3297 }
3298
3299 /* Empty path since the session is network */
3300 path = "";
3301 break;
3302 case LTTNG_DST_PATH:
3303 /* Very volatile pointer. Only used for the create session. */
3304 path = ctrl_uri->dst.path;
3305 strncpy(consumer->dst.trace_path, path,
3306 sizeof(consumer->dst.trace_path));
3307 break;
3308 }
3309
3310 /* Set if the consumer is enabled or not */
3311 consumer->enabled = enable_consumer;
54d01ffb 3312
730389d9
DG
3313 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
3314 LTTNG_SOCK_GET_GID_CRED(creds));
54d01ffb 3315 if (ret != LTTCOMM_OK) {
00e2e675 3316 goto consumer_error;
54d01ffb
DG
3317 }
3318
00e2e675
DG
3319 /* Get the newly created session pointer back */
3320 session = session_find_by_name(name);
3321 assert(session);
3322
3323 /* Assign consumer to session */
3324 session->consumer = consumer;
3325
3326 return LTTCOMM_OK;
3327
3328consumer_error:
3329 consumer_destroy_output(consumer);
3330error:
3331 return ret;
3332}
3333
3334/*
3335 * Command LTTNG_CREATE_SESSION processed by the client thread.
3336 */
3337static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds)
3338{
3339 int ret;
3340 struct lttng_uri uri;
3341
3342 /* Zeroed temporary URI */
3343 memset(&uri, 0, sizeof(uri));
3344
3345 uri.dtype = LTTNG_DST_PATH;
3346 uri.utype = LTTNG_URI_DST;
3347 strncpy(uri.dst.path, path, sizeof(uri.dst.path));
3348
3349 /* TODO: Strip date-time from path and put it in uri's subdir */
3350
3351 ret = cmd_create_session_uri(name, &uri, NULL, 1, creds);
3352 if (ret != LTTCOMM_OK) {
3353 goto error;
3354 }
54d01ffb
DG
3355
3356error:
3357 return ret;
3358}
3359
3360/*
3361 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3362 */
3363static int cmd_destroy_session(struct ltt_session *session, char *name)
3364{
3365 int ret;
3366
3367 /* Clean kernel session teardown */
3368 teardown_kernel_session(session);
84cd17c6
MD
3369 /* UST session teardown */
3370 teardown_ust_session(session);
54d01ffb
DG
3371
3372 /*
3373 * Must notify the kernel thread here to update it's poll setin order
3374 * to remove the channel(s)' fd just destroyed.
3375 */
3376 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3377 if (ret < 0) {
76d7553f 3378 PERROR("write kernel poll pipe");
54d01ffb
DG
3379 }
3380
271933a4 3381 ret = session_destroy(session);
54d01ffb
DG
3382
3383 return ret;
3384}
3385
3386/*
3387 * Command LTTNG_CALIBRATE processed by the client thread.
3388 */
3389static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3390{
3391 int ret;
3392
3393 switch (domain) {
3394 case LTTNG_DOMAIN_KERNEL:
33a2b854 3395 {
54d01ffb 3396 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3397
54d01ffb
DG
3398 kcalibrate.type = calibrate->type;
3399 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3400 if (ret < 0) {
54d01ffb
DG
3401 ret = LTTCOMM_KERN_ENABLE_FAIL;
3402 goto error;
33a2b854 3403 }
54d01ffb
DG
3404 break;
3405 }
4466912f
DG
3406 case LTTNG_DOMAIN_UST:
3407 {
3408 struct lttng_ust_calibrate ucalibrate;
3409
3410 ucalibrate.type = calibrate->type;
3411 ret = ust_app_calibrate_glb(&ucalibrate);
3412 if (ret < 0) {
3413 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3414 goto error;
3415 }
3416 break;
3417 }
54d01ffb 3418 default:
1ab1ea0b 3419 ret = LTTCOMM_UND;
54d01ffb
DG
3420 goto error;
3421 }
33a2b854 3422
54d01ffb 3423 ret = LTTCOMM_OK;
33a2b854 3424
54d01ffb
DG
3425error:
3426 return ret;
3427}
7d29a247 3428
54d01ffb
DG
3429/*
3430 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3431 */
3432static int cmd_register_consumer(struct ltt_session *session, int domain,
3433 char *sock_path)
3434{
3435 int ret, sock;
b389abbe 3436
54d01ffb
DG
3437 switch (domain) {
3438 case LTTNG_DOMAIN_KERNEL:
3439 /* Can't register a consumer if there is already one */
48c4f28c 3440 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG
3441 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3442 goto error;
3443 }
3444
3445 sock = lttcomm_connect_unix_sock(sock_path);
3446 if (sock < 0) {
3447 ret = LTTCOMM_CONNECT_FAIL;
3448 goto error;
3449 }
3450
3451 session->kernel_session->consumer_fd = sock;
3452 break;
3453 default:
3454 /* TODO: Userspace tracing */
1ab1ea0b 3455 ret = LTTCOMM_UND;
54d01ffb
DG
3456 goto error;
3457 }
3458
3459 ret = LTTCOMM_OK;
3460
3461error:
3462 return ret;
3463}
3464
3465/*
3466 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3467 */
3468static ssize_t cmd_list_domains(struct ltt_session *session,
3469 struct lttng_domain **domains)
3470{
b551a063 3471 int ret, index = 0;
54d01ffb
DG
3472 ssize_t nb_dom = 0;
3473
3474 if (session->kernel_session != NULL) {
b551a063 3475 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3476 nb_dom++;
3477 }
3478
b551a063
DG
3479 if (session->ust_session != NULL) {
3480 DBG3("Listing domains found UST global domain");
3481 nb_dom++;
3482 }
54d01ffb 3483
b551a063 3484 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3485 if (*domains == NULL) {
3486 ret = -LTTCOMM_FATAL;
3487 goto error;
3488 }
3489
b551a063
DG
3490 if (session->kernel_session != NULL) {
3491 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3492 index++;
3493 }
3494
3495 if (session->ust_session != NULL) {
3496 (*domains)[index].type = LTTNG_DOMAIN_UST;
3497 index++;
3498 }
54d01ffb 3499
54d01ffb
DG
3500 return nb_dom;
3501
3502error:
3503 return ret;
3504}
3505
3506/*
3507 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3508 */
b551a063 3509static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG
3510 struct lttng_channel **channels)
3511{
3512 int ret;
3513 ssize_t nb_chan = 0;
3514
b551a063
DG
3515 switch (domain) {
3516 case LTTNG_DOMAIN_KERNEL:
3517 if (session->kernel_session != NULL) {
3518 nb_chan = session->kernel_session->channel_count;
3519 }
0df502fd 3520 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG
3521 break;
3522 case LTTNG_DOMAIN_UST:
3523 if (session->ust_session != NULL) {
bec39940 3524 nb_chan = lttng_ht_get_count(
b551a063
DG
3525 session->ust_session->domain_global.channels);
3526 }
0df502fd 3527 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG
3528 break;
3529 default:
3530 *channels = NULL;
1ab1ea0b 3531 ret = -LTTCOMM_UND;
54d01ffb
DG
3532 goto error;
3533 }
3534
b551a063
DG
3535 if (nb_chan > 0) {
3536 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3537 if (*channels == NULL) {
3538 ret = -LTTCOMM_FATAL;
3539 goto error;
3540 }
54d01ffb 3541
b551a063
DG
3542 list_lttng_channels(domain, session, *channels);
3543 } else {
3544 *channels = NULL;
3545 }
2bdd86d4 3546
54d01ffb
DG
3547 return nb_chan;
3548
3549error:
3550 return ret;
3551}
3552
3553/*
3554 * Command LTTNG_LIST_EVENTS processed by the client thread.
3555 */
b551a063 3556static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG
3557 char *channel_name, struct lttng_event **events)
3558{
b551a063 3559 int ret = 0;
54d01ffb 3560 ssize_t nb_event = 0;
54d01ffb 3561
b551a063
DG
3562 switch (domain) {
3563 case LTTNG_DOMAIN_KERNEL:
3564 if (session->kernel_session != NULL) {
3565 nb_event = list_lttng_kernel_events(channel_name,
3566 session->kernel_session, events);
54d01ffb 3567 }
b551a063
DG
3568 break;
3569 case LTTNG_DOMAIN_UST:
3570 {
3571 if (session->ust_session != NULL) {
3572 nb_event = list_lttng_ust_global_events(channel_name,
3573 &session->ust_session->domain_global, events);
3574 }
3575 break;
54d01ffb 3576 }
b551a063 3577 default:
1ab1ea0b 3578 ret = -LTTCOMM_UND;
54d01ffb
DG
3579 goto error;
3580 }
3581
b551a063 3582 ret = nb_event;
54d01ffb
DG
3583
3584error:
3585 return ret;
3586}
3587
00e2e675
DG
3588/*
3589 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
3590 */
3591static int cmd_set_consumer_uri(int domain, struct ltt_session *session,
3592 struct lttng_uri *uri)
3593{
3594 int ret;
3595 struct ltt_kernel_session *ksess = session->kernel_session;
3596 struct ltt_ust_session *usess = session->ust_session;
3597 struct consumer_output *consumer;
3598
3599 /* Can't enable consumer after session started. */
3600 if (session->enabled) {
3601 ret = LTTCOMM_TRACE_ALREADY_STARTED;
3602 goto error;
3603 }
3604
3605 switch (domain) {
3606 case LTTNG_DOMAIN_KERNEL:
3607 /* Code flow error if we don't have a kernel session here. */
3608 assert(ksess);
3609
3610 /* Create consumer output if none exists */
3611 consumer = ksess->tmp_consumer;
3612 if (consumer == NULL) {
3613 consumer = consumer_copy_output(ksess->consumer);
3614 if (consumer == NULL) {
3615 ret = LTTCOMM_FATAL;
3616 goto error;
3617 }
3618 /* Reassign new pointer */
3619 ksess->tmp_consumer = consumer;
3620 }
3621
3622 switch (uri->dtype) {
3623 case LTTNG_DST_IPV4:
3624 case LTTNG_DST_IPV6:
3625 DBG2("Setting network URI for kernel session %s", session->name);
3626
3627 /* Set URI into consumer output object */
3628 ret = consumer_set_network_uri(consumer, uri);
3629 if (ret < 0) {
3630 ret = LTTCOMM_FATAL;
3631 goto error;
3632 }
3633
3634 /* On a new subdir, reappend the default trace dir. */
3635 if (strlen(uri->subdir) != 0) {
3636 strncat(consumer->subdir, DEFAULT_KERNEL_TRACE_DIR,
3637 sizeof(consumer->subdir));
3638 }
3639
3640 ret = send_socket_relayd_consumer(domain, session, uri, consumer,
3641 ksess->consumer_fd);
3642 if (ret != LTTCOMM_OK) {
3643 goto error;
3644 }
3645 break;
3646 case LTTNG_DST_PATH:
3647 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
3648 memset(consumer->dst.trace_path, 0,
3649 sizeof(consumer->dst.trace_path));
3650 strncpy(consumer->dst.trace_path, uri->dst.path,
3651 sizeof(consumer->dst.trace_path));
3652 /* Append default kernel trace dir */
3653 strncat(consumer->dst.trace_path, DEFAULT_KERNEL_TRACE_DIR,
3654 sizeof(consumer->dst.trace_path));
3655 break;
3656 }
3657
3658 /* All good! */
3659 break;
3660 case LTTNG_DOMAIN_UST:
3661 /* Code flow error if we don't have a kernel session here. */
3662 assert(usess);
3663
3664 /* Create consumer output if none exists */
3665 consumer = usess->tmp_consumer;
3666 if (consumer == NULL) {
3667 consumer = consumer_copy_output(usess->consumer);
3668 if (consumer == NULL) {
3669 ret = LTTCOMM_FATAL;
3670 goto error;
3671 }
3672 /* Reassign new pointer */
3673 usess->tmp_consumer = consumer;
3674 }
3675
3676 switch (uri->dtype) {
3677 case LTTNG_DST_IPV4:
3678 case LTTNG_DST_IPV6:
3679 {
3680 DBG2("Setting network URI for UST session %s", session->name);
3681
3682 /* Set URI into consumer object */
3683 ret = consumer_set_network_uri(consumer, uri);
3684 if (ret < 0) {
3685 ret = LTTCOMM_FATAL;
3686 goto error;
3687 }
3688
3689 /* On a new subdir, reappend the default trace dir. */
3690 if (strlen(uri->subdir) != 0) {
3691 strncat(consumer->subdir, DEFAULT_UST_TRACE_DIR,
3692 sizeof(consumer->subdir));
3693 }
3694
3695 if (ust_consumerd64_fd >= 0) {
3696 ret = send_socket_relayd_consumer(domain, session, uri,
3697 consumer, ust_consumerd64_fd);
3698 if (ret != LTTCOMM_OK) {
3699 goto error;
3700 }
3701 }
3702
3703 if (ust_consumerd32_fd >= 0) {
3704 ret = send_socket_relayd_consumer(domain, session, uri,
3705 consumer, ust_consumerd32_fd);
3706 if (ret != LTTCOMM_OK) {
3707 goto error;
3708 }
3709 }
3710
3711 break;
3712 }
3713 case LTTNG_DST_PATH:
3714 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
3715 memset(consumer->dst.trace_path, 0,
3716 sizeof(consumer->dst.trace_path));
3717 strncpy(consumer->dst.trace_path, uri->dst.path,
3718 sizeof(consumer->dst.trace_path));
3719 /* Append default UST trace dir */
3720 strncat(consumer->dst.trace_path, DEFAULT_UST_TRACE_DIR,
3721 sizeof(consumer->dst.trace_path));
3722 break;
3723 }
3724 break;
3725 }
3726
3727 /* All good! */
3728 ret = LTTCOMM_OK;
3729
3730error:
3731 return ret;
3732}
3733
3734/*
3735 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
3736 */
3737static int cmd_disable_consumer(int domain, struct ltt_session *session)
3738{
3739 int ret;
3740 struct ltt_kernel_session *ksess = session->kernel_session;
3741 struct ltt_ust_session *usess = session->ust_session;
3742 struct consumer_output *consumer;
3743
3744 if (session->enabled) {
3745 /* Can't disable consumer on an already started session */
3746 ret = LTTCOMM_TRACE_ALREADY_STARTED;
3747 goto error;
3748 }
3749
3750 switch (domain) {
3751 case LTTNG_DOMAIN_KERNEL:
3752 /* Code flow error if we don't have a kernel session here. */
3753 assert(ksess);
3754
3755 DBG("Disabling kernel consumer");
3756 consumer = ksess->consumer;
3757
3758 break;
3759 case LTTNG_DOMAIN_UST:
3760 /* Code flow error if we don't have a UST session here. */
3761 assert(usess);
3762
3763 DBG("Disabling UST consumer");
3764 consumer = usess->consumer;
3765
3766 break;
3767 default:
3768 ret = LTTCOMM_UNKNOWN_DOMAIN;
3769 goto error;
3770 }
3771
3772 assert(consumer);
3773 consumer->enabled = 0;
3774
3775 /* Success at this point */
3776 ret = LTTCOMM_OK;
3777
3778error:
3779 return ret;
3780}
3781
3782/*
3783 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
3784 */
3785static int cmd_enable_consumer(int domain, struct ltt_session *session)
3786{
3787 int ret;
3788 struct ltt_kernel_session *ksess = session->kernel_session;
3789 struct ltt_ust_session *usess = session->ust_session;
3790 struct consumer_output *tmp_out;
3791
3792 /* Can't enable consumer after session started. */
3793 if (session->enabled) {
3794 ret = LTTCOMM_TRACE_ALREADY_STARTED;
3795 goto error;
3796 }
3797
3798 switch (domain) {
3799 case LTTNG_DOMAIN_KERNEL:
3800 /* Code flow error if we don't have a kernel session here. */
3801 assert(ksess);
3802
3803 /*
3804 * Check if we have already sent fds to the consumer. In that case,
3805 * the enable-consumer command can't be used because a start trace
3806 * had previously occured.
3807 */
3808 if (ksess->consumer_fds_sent) {
3809 ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
3810 goto error;
3811 }
3812
3813 tmp_out = ksess->tmp_consumer;
3814 if (tmp_out == NULL) {
3815 /* No temp. consumer output exists. Using the current one. */
3816 DBG3("No temporary consumer. Using default");
3817 ret = LTTCOMM_OK;
3818 goto error;
3819 }
3820
3821 switch (tmp_out->type) {
3822 case CONSUMER_DST_LOCAL:
3823 DBG2("Consumer output is local. Creating directory(ies)");
3824
3825 /* Create directory(ies) */
3826 ret = run_as_mkdir_recursive(tmp_out->dst.trace_path,
3827 S_IRWXU | S_IRWXG, session->uid, session->gid);
3828 if (ret < 0) {
3829 if (ret != -EEXIST) {
3830 ERR("Trace directory creation error");
3831 ret = LTTCOMM_FATAL;
3832 goto error;
3833 }
3834 }
3835 break;
3836 case CONSUMER_DST_NET:
3837 DBG2("Consumer output is network. Validating URIs");
3838 /* Validate if we have both control and data path set. */
3839 if (!tmp_out->dst.net.control_isset) {
3840 ret = LTTCOMM_URI_CTRL_MISS;
3841 goto error;
3842 }
3843
3844 if (!tmp_out->dst.net.data_isset) {
3845 ret = LTTCOMM_URI_DATA_MISS;
3846 goto error;
3847 }
3848
3849 /* Check established network session state */
3850 if (session->net_handle == 0) {
3851 ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
3852 ERR("Session network handle is not set on enable-consumer");
3853 goto error;
3854 }
3855
3856 /* Append default kernel trace dir to subdir */
3857 strncat(ksess->consumer->subdir, DEFAULT_KERNEL_TRACE_DIR,
3858 sizeof(ksess->consumer->subdir));
3859
3860 break;
3861 }
3862
3863 /*
3864 * @session-lock
3865 * This is race free for now since the session lock is acquired before
3866 * ending up in this function. No other threads can access this kernel
3867 * session without this lock hence freeing the consumer output object
3868 * is valid.
3869 */
3870 consumer_destroy_output(ksess->consumer);
3871 ksess->consumer = tmp_out;
3872 ksess->tmp_consumer = NULL;
3873
3874 break;
3875 case LTTNG_DOMAIN_UST:
3876 /* Code flow error if we don't have a UST session here. */
3877 assert(usess);
3878
3879 /*
3880 * Check if we have already sent fds to the consumer. In that case,
3881 * the enable-consumer command can't be used because a start trace
3882 * had previously occured.
3883 */
3884 if (usess->start_trace) {
3885 ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
3886 goto error;
3887 }
3888
3889 tmp_out = usess->tmp_consumer;
3890 if (tmp_out == NULL) {
3891 /* No temp. consumer output exists. Using the current one. */
3892 DBG3("No temporary consumer. Using default");
3893 ret = LTTCOMM_OK;
3894 goto error;
3895 }
3896
3897 switch (tmp_out->type) {
3898 case CONSUMER_DST_LOCAL:
3899 DBG2("Consumer output is local. Creating directory(ies)");
3900
3901 /* Create directory(ies) */
3902 ret = run_as_mkdir_recursive(tmp_out->dst.trace_path,
3903 S_IRWXU | S_IRWXG, session->uid, session->gid);
3904 if (ret < 0) {
3905 if (ret != -EEXIST) {
3906 ERR("Trace directory creation error");
3907 ret = LTTCOMM_FATAL;
3908 goto error;
3909 }
3910 }
3911 break;
3912 case CONSUMER_DST_NET:
3913 DBG2("Consumer output is network. Validating URIs");
3914 /* Validate if we have both control and data path set. */
3915 if (!tmp_out->dst.net.control_isset) {
3916 ret = LTTCOMM_URI_CTRL_MISS;
3917 goto error;
3918 }
3919
3920 if (!tmp_out->dst.net.data_isset) {
3921 ret = LTTCOMM_URI_DATA_MISS;
3922 goto error;
3923 }
3924
3925 /* Check established network session state */
3926 if (session->net_handle == 0) {
3927 ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
3928 DBG2("Session network handle is not set on enable-consumer");
3929 goto error;
3930 }
3931
3932 if (tmp_out->net_seq_index == -1) {
3933 ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
3934 DBG2("Network index is not set on the consumer");
3935 goto error;
3936 }
3937
3938 /* Append default kernel trace dir to subdir */
3939 strncat(usess->consumer->subdir, DEFAULT_UST_TRACE_DIR,
3940 sizeof(usess->consumer->subdir));
3941
3942 break;
3943 }
3944
3945 /*
3946 * @session-lock
3947 * This is race free for now since the session lock is acquired before
3948 * ending up in this function. No other threads can access this kernel
3949 * session without this lock hence freeing the consumer output object
3950 * is valid.
3951 */
3952 consumer_destroy_output(usess->consumer);
3953 usess->consumer = tmp_out;
3954 usess->tmp_consumer = NULL;
3955
3956 break;
3957 }
3958
3959 /* Success at this point */
3960 ret = LTTCOMM_OK;
3961
3962error:
3963 return ret;
3964}
3965
54d01ffb
DG
3966/*
3967 * Process the command requested by the lttng client within the command
3968 * context structure. This function make sure that the return structure (llm)
3969 * is set and ready for transmission before returning.
3970 *
3971 * Return any error encountered or 0 for success.
53a80697
MD
3972 *
3973 * "sock" is only used for special-case var. len data.
54d01ffb 3974 */
53a80697
MD
3975static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
3976 int *sock_error)
54d01ffb
DG
3977{
3978 int ret = LTTCOMM_OK;
44d3bd01 3979 int need_tracing_session = 1;
2e09ba09 3980 int need_domain;
54d01ffb
DG
3981
3982 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3983
53a80697
MD
3984 *sock_error = 0;
3985
2e09ba09
MD
3986 switch (cmd_ctx->lsm->cmd_type) {
3987 case LTTNG_CREATE_SESSION:
00e2e675 3988 case LTTNG_CREATE_SESSION_URI:
2e09ba09
MD
3989 case LTTNG_DESTROY_SESSION:
3990 case LTTNG_LIST_SESSIONS:
3991 case LTTNG_LIST_DOMAINS:
3992 case LTTNG_START_TRACE:
3993 case LTTNG_STOP_TRACE:
3994 need_domain = 0;
3aace903 3995 break;
2e09ba09
MD
3996 default:
3997 need_domain = 1;
3998 }
3999
4000 if (opt_no_kernel && need_domain
4001 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
531d29f9
MD
4002 if (!is_root) {
4003 ret = LTTCOMM_NEED_ROOT_SESSIOND;
4004 } else {
4005 ret = LTTCOMM_KERN_NA;
4006 }
4fba7219
DG
4007 goto error;
4008 }
4009
54d01ffb
DG
4010 /*
4011 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 4012 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
4013 * command.
4014 */
4015 switch(cmd_ctx->lsm->cmd_type) {
4016 case LTTNG_LIST_SESSIONS:
4017 case LTTNG_LIST_TRACEPOINTS:
f37d259d 4018 case LTTNG_LIST_TRACEPOINT_FIELDS:
54d01ffb
DG
4019 case LTTNG_LIST_DOMAINS:
4020 case LTTNG_LIST_CHANNELS:
4021 case LTTNG_LIST_EVENTS:
4022 break;
4023 default:
4024 /* Setup lttng message with no payload */
4025 ret = setup_lttng_msg(cmd_ctx, 0);
4026 if (ret < 0) {
4027 /* This label does not try to unlock the session */
4028 goto init_setup_error;
4029 }
4030 }
4031
4032 /* Commands that DO NOT need a session. */
4033 switch (cmd_ctx->lsm->cmd_type) {
54d01ffb 4034 case LTTNG_CREATE_SESSION:
00e2e675 4035 case LTTNG_CREATE_SESSION_URI:
2e09ba09 4036 case LTTNG_CALIBRATE:
54d01ffb
DG
4037 case LTTNG_LIST_SESSIONS:
4038 case LTTNG_LIST_TRACEPOINTS:
f37d259d 4039 case LTTNG_LIST_TRACEPOINT_FIELDS:
44d3bd01 4040 need_tracing_session = 0;
54d01ffb
DG
4041 break;
4042 default:
4043 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
256a5576
MD
4044 /*
4045 * We keep the session list lock across _all_ commands
4046 * for now, because the per-session lock does not
4047 * handle teardown properly.
4048 */
74babd95 4049 session_lock_list();
54d01ffb
DG
4050 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
4051 if (cmd_ctx->session == NULL) {
4052 if (cmd_ctx->lsm->session.name != NULL) {
4053 ret = LTTCOMM_SESS_NOT_FOUND;
4054 } else {
4055 /* If no session name specified */
4056 ret = LTTCOMM_SELECT_SESS;
4057 }
4058 goto error;
4059 } else {
4060 /* Acquire lock for the session */
4061 session_lock(cmd_ctx->session);
4062 }
4063 break;
4064 }
b389abbe 4065
2e09ba09
MD
4066 if (!need_domain) {
4067 goto skip_domain;
4068 }
54d01ffb
DG
4069 /*
4070 * Check domain type for specific "pre-action".
4071 */
4072 switch (cmd_ctx->lsm->domain.type) {
4073 case LTTNG_DOMAIN_KERNEL:
d1f1c568 4074 if (!is_root) {
531d29f9 4075 ret = LTTCOMM_NEED_ROOT_SESSIOND;
d1f1c568
DG
4076 goto error;
4077 }
4078
54d01ffb 4079 /* Kernel tracer check */
a4b35e07 4080 if (kernel_tracer_fd == -1) {
54d01ffb 4081 /* Basically, load kernel tracer modules */
096102bd
DG
4082 ret = init_kernel_tracer();
4083 if (ret != 0) {
54d01ffb
DG
4084 goto error;
4085 }
4086 }
5eb91c98 4087
5c827ce0
DG
4088 /* Consumer is in an ERROR state. Report back to client */
4089 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
4090 ret = LTTCOMM_NO_KERNCONSUMERD;
4091 goto error;
4092 }
4093
54d01ffb 4094 /* Need a session for kernel command */
44d3bd01 4095 if (need_tracing_session) {
54d01ffb 4096 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 4097 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 4098 if (ret < 0) {
54d01ffb 4099 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG
4100 goto error;
4101 }
b389abbe 4102 }
7d29a247 4103
54d01ffb 4104 /* Start the kernel consumer daemon */
3bd1e081
MD
4105 pthread_mutex_lock(&kconsumer_data.pid_mutex);
4106 if (kconsumer_data.pid == 0 &&
54d01ffb 4107 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
4108 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
4109 ret = start_consumerd(&kconsumer_data);
7d29a247 4110 if (ret < 0) {
54d01ffb
DG
4111 ret = LTTCOMM_KERN_CONSUMER_FAIL;
4112 goto error;
950131af 4113 }
5c827ce0 4114 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
00e2e675
DG
4115
4116 /* Set consumer fd of the session */
4117 cmd_ctx->session->kernel_session->consumer_fd =
4118 kconsumer_data.cmd_sock;
3ff2ecac
MD
4119 } else {
4120 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 4121 }
0d0c377a 4122 }
5c827ce0 4123
54d01ffb 4124 break;
2bdd86d4 4125 case LTTNG_DOMAIN_UST:
44d3bd01 4126 {
5c827ce0
DG
4127 /* Consumer is in an ERROR state. Report back to client */
4128 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
4129 ret = LTTCOMM_NO_USTCONSUMERD;
4130 goto error;
4131 }
4132
44d3bd01 4133 if (need_tracing_session) {
f6a9efaa 4134 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 4135 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 4136 &cmd_ctx->lsm->domain);
44d3bd01
DG
4137 if (ret != LTTCOMM_OK) {
4138 goto error;
4139 }
4140 }
00e2e675 4141
7753dea8
MD
4142 /* Start the UST consumer daemons */
4143 /* 64-bit */
4144 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 4145 if (consumerd64_bin[0] != '\0' &&
7753dea8 4146 ustconsumer64_data.pid == 0 &&
2bdd86d4 4147 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
4148 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
4149 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 4150 if (ret < 0) {
7753dea8
MD
4151 ret = LTTCOMM_UST_CONSUMER64_FAIL;
4152 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD
4153 goto error;
4154 }
48842b30 4155
7753dea8 4156 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
5c827ce0 4157 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3ff2ecac 4158 } else {
7753dea8
MD
4159 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
4160 }
4161 /* 32-bit */
fc7a59ce 4162 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD
4163 ustconsumer32_data.pid == 0 &&
4164 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
4165 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
4166 ret = start_consumerd(&ustconsumer32_data);
4167 if (ret < 0) {
4168 ret = LTTCOMM_UST_CONSUMER32_FAIL;
4169 ust_consumerd32_fd = -EINVAL;
4170 goto error;
4171 }
5c827ce0 4172
7753dea8 4173 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
5c827ce0 4174 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
7753dea8
MD
4175 } else {
4176 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 4177 }
44d3bd01
DG
4178 }
4179 break;
48842b30 4180 }
54d01ffb 4181 default:
54d01ffb
DG
4182 break;
4183 }
2e09ba09 4184skip_domain:
33a2b854 4185
5c827ce0
DG
4186 /* Validate consumer daemon state when start/stop trace command */
4187 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
4188 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
4189 switch (cmd_ctx->lsm->domain.type) {
4190 case LTTNG_DOMAIN_UST:
4191 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
4192 ret = LTTCOMM_NO_USTCONSUMERD;
4193 goto error;
4194 }
4195 break;
4196 case LTTNG_DOMAIN_KERNEL:
4197 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
4198 ret = LTTCOMM_NO_KERNCONSUMERD;
4199 goto error;
4200 }
4201 break;
4202 }
4203 }
4204
8e0af1b4
MD
4205 /*
4206 * Check that the UID or GID match that of the tracing session.
4207 * The root user can interact with all sessions.
4208 */
4209 if (need_tracing_session) {
4210 if (!session_access_ok(cmd_ctx->session,
730389d9
DG
4211 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
4212 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
8e0af1b4
MD
4213 ret = LTTCOMM_EPERM;
4214 goto error;
4215 }
4216 }
4217
54d01ffb
DG
4218 /* Process by command type */
4219 switch (cmd_ctx->lsm->cmd_type) {
4220 case LTTNG_ADD_CONTEXT:
4221 {
4222 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
4223 cmd_ctx->lsm->u.context.channel_name,
4224 cmd_ctx->lsm->u.context.event_name,
4225 &cmd_ctx->lsm->u.context.ctx);
4226 break;
4227 }
4228 case LTTNG_DISABLE_CHANNEL:
4229 {
4230 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
4231 cmd_ctx->lsm->u.disable.channel_name);
4232 break;
4233 }
4234 case LTTNG_DISABLE_EVENT:
4235 {
4236 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
4237 cmd_ctx->lsm->u.disable.channel_name,
4238 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
4239 break;
4240 }
54d01ffb
DG
4241 case LTTNG_DISABLE_ALL_EVENT:
4242 {
2bdd86d4 4243 DBG("Disabling all events");
54d01ffb
DG
4244
4245 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
4246 cmd_ctx->lsm->u.disable.channel_name);
4247 break;
4248 }
00e2e675
DG
4249 case LTTNG_DISABLE_CONSUMER:
4250 {
4251 ret = cmd_disable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session);
4252 break;
4253 }
54d01ffb
DG
4254 case LTTNG_ENABLE_CHANNEL:
4255 {
aea829b3 4256 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG
4257 &cmd_ctx->lsm->u.channel.chan);
4258 break;
4259 }
00e2e675
DG
4260 case LTTNG_ENABLE_CONSUMER:
4261 {
4262 ret = cmd_enable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session);
4263 break;
4264 }
54d01ffb
DG
4265 case LTTNG_ENABLE_EVENT:
4266 {
4267 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
4268 cmd_ctx->lsm->u.enable.channel_name,
4269 &cmd_ctx->lsm->u.enable.event);
4270 break;
4271 }
4272 case LTTNG_ENABLE_ALL_EVENT:
4273 {
2bdd86d4 4274 DBG("Enabling all events");
54d01ffb
DG
4275
4276 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG
4277 cmd_ctx->lsm->u.enable.channel_name,
4278 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG
4279 break;
4280 }
052da939 4281 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 4282 {
9f19cc17 4283 struct lttng_event *events;
54d01ffb 4284 ssize_t nb_events;
052da939 4285
54d01ffb
DG
4286 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
4287 if (nb_events < 0) {
4288 ret = -nb_events;
4289 goto error;
2ef84c95
DG
4290 }
4291
4292 /*
4293 * Setup lttng message with payload size set to the event list size in
4294 * bytes and then copy list into the llm payload.
4295 */
052da939 4296 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 4297 if (ret < 0) {
052da939 4298 free(events);
2ef84c95
DG
4299 goto setup_error;
4300 }
4301
4302 /* Copy event list into message payload */
9f19cc17 4303 memcpy(cmd_ctx->llm->payload, events,
052da939 4304 sizeof(struct lttng_event) * nb_events);
2ef84c95 4305
9f19cc17 4306 free(events);
2ef84c95
DG
4307
4308 ret = LTTCOMM_OK;
4309 break;
4310 }
f37d259d
MD
4311 case LTTNG_LIST_TRACEPOINT_FIELDS:
4312 {
4313 struct lttng_event_field *fields;
4314 ssize_t nb_fields;
4315
4316 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, &fields);
4317 if (nb_fields < 0) {
4318 ret = -nb_fields;
4319 goto error;
4320 }
4321
4322 /*
4323 * Setup lttng message with payload size set to the event list size in
4324 * bytes and then copy list into the llm payload.
4325 */
4326 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event_field) * nb_fields);
4327 if (ret < 0) {
4328 free(fields);
4329 goto setup_error;
4330 }
4331
4332 /* Copy event list into message payload */
4333 memcpy(cmd_ctx->llm->payload, fields,
4334 sizeof(struct lttng_event_field) * nb_fields);
4335
4336 free(fields);
4337
4338 ret = LTTCOMM_OK;
4339 break;
4340 }
00e2e675
DG
4341 case LTTNG_SET_CONSUMER_URI:
4342 {
4343 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
4344 &cmd_ctx->lsm->u.uri);
4345 break;
4346 }
f3ed775e 4347 case LTTNG_START_TRACE:
8c0faa1d 4348 {
54d01ffb 4349 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
4350 break;
4351 }
f3ed775e 4352 case LTTNG_STOP_TRACE:
8c0faa1d 4353 {
54d01ffb 4354 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
4355 break;
4356 }
5e16da05
MD
4357 case LTTNG_CREATE_SESSION:
4358 {
54d01ffb 4359 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 4360 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
5e16da05
MD
4361 break;
4362 }
00e2e675
DG
4363 case LTTNG_CREATE_SESSION_URI:
4364 {
4365 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name,
4366 &cmd_ctx->lsm->u.create_uri.ctrl_uri,
4367 &cmd_ctx->lsm->u.create_uri.data_uri,
4368 cmd_ctx->lsm->u.create_uri.enable_consumer, &cmd_ctx->creds);
4369 break;
4370 }
5e16da05
MD
4371 case LTTNG_DESTROY_SESSION:
4372 {
54d01ffb
DG
4373 ret = cmd_destroy_session(cmd_ctx->session,
4374 cmd_ctx->lsm->session.name);
256a5576
MD
4375 /*
4376 * Set session to NULL so we do not unlock it after
4377 * free.
4378 */
4379 cmd_ctx->session = NULL;
5461b305 4380 break;
5e16da05 4381 }
9f19cc17 4382 case LTTNG_LIST_DOMAINS:
5e16da05 4383 {
54d01ffb
DG
4384 ssize_t nb_dom;
4385 struct lttng_domain *domains;
5461b305 4386
54d01ffb
DG
4387 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
4388 if (nb_dom < 0) {
4389 ret = -nb_dom;
4390 goto error;
ce3d728c 4391 }
520ff687 4392
54d01ffb 4393 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
4394 if (ret < 0) {
4395 goto setup_error;
520ff687 4396 }
57167058 4397
54d01ffb
DG
4398 /* Copy event list into message payload */
4399 memcpy(cmd_ctx->llm->payload, domains,
4400 nb_dom * sizeof(struct lttng_domain));
4401
4402 free(domains);
5e16da05 4403
5461b305 4404 ret = LTTCOMM_OK;
5e16da05
MD
4405 break;
4406 }
9f19cc17 4407 case LTTNG_LIST_CHANNELS:
5e16da05 4408 {
6775595e 4409 int nb_chan;
54d01ffb
DG
4410 struct lttng_channel *channels;
4411
b551a063
DG
4412 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
4413 cmd_ctx->session, &channels);
54d01ffb
DG
4414 if (nb_chan < 0) {
4415 ret = -nb_chan;
4416 goto error;
5461b305 4417 }
ca95a216 4418
54d01ffb 4419 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
4420 if (ret < 0) {
4421 goto setup_error;
4422 }
9f19cc17 4423
54d01ffb
DG
4424 /* Copy event list into message payload */
4425 memcpy(cmd_ctx->llm->payload, channels,
4426 nb_chan * sizeof(struct lttng_channel));
4427
4428 free(channels);
9f19cc17
DG
4429
4430 ret = LTTCOMM_OK;
5461b305 4431 break;
5e16da05 4432 }
9f19cc17 4433 case LTTNG_LIST_EVENTS:
5e16da05 4434 {
b551a063 4435 ssize_t nb_event;
684d34d2 4436 struct lttng_event *events = NULL;
9f19cc17 4437
b551a063 4438 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
4439 cmd_ctx->lsm->u.list.channel_name, &events);
4440 if (nb_event < 0) {
4441 ret = -nb_event;
4442 goto error;
5461b305 4443 }
ca95a216 4444
54d01ffb 4445 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
4446 if (ret < 0) {
4447 goto setup_error;
4448 }
9f19cc17 4449
54d01ffb
DG
4450 /* Copy event list into message payload */
4451 memcpy(cmd_ctx->llm->payload, events,
4452 nb_event * sizeof(struct lttng_event));
9f19cc17 4453
54d01ffb 4454 free(events);
9f19cc17
DG
4455
4456 ret = LTTCOMM_OK;
5461b305 4457 break;
5e16da05
MD
4458 }
4459 case LTTNG_LIST_SESSIONS:
4460 {
8e0af1b4 4461 unsigned int nr_sessions;
5461b305 4462
8e0af1b4 4463 session_lock_list();
730389d9
DG
4464 nr_sessions = lttng_sessions_count(
4465 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
4466 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
d32fb093 4467
8e0af1b4 4468 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 4469 if (ret < 0) {
54d01ffb 4470 session_unlock_list();
5461b305 4471 goto setup_error;
e065084a 4472 }
5e16da05 4473
6c9cc2ab 4474 /* Filled the session array */
8e0af1b4 4475 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
730389d9
DG
4476 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
4477 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
6c9cc2ab 4478
54d01ffb 4479 session_unlock_list();
5e16da05 4480
5461b305 4481 ret = LTTCOMM_OK;
5e16da05
MD
4482 break;
4483 }
d0254c7c
MD
4484 case LTTNG_CALIBRATE:
4485 {
54d01ffb
DG
4486 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
4487 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
4488 break;
4489 }
d9800920
DG
4490 case LTTNG_REGISTER_CONSUMER:
4491 {
54d01ffb
DG
4492 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
4493 cmd_ctx->lsm->u.reg.path);
d9800920
DG
4494 break;
4495 }
53a80697
MD
4496 case LTTNG_SET_FILTER:
4497 {
4498 struct lttng_filter_bytecode *bytecode;
4499
4500 if (cmd_ctx->lsm->u.filter.bytecode_len > 65336) {
4501 ret = LTTCOMM_FILTER_INVAL;
4502 goto error;
4503 }
4504 bytecode = zmalloc(cmd_ctx->lsm->u.filter.bytecode_len);
4505 if (!bytecode) {
4506 ret = LTTCOMM_FILTER_NOMEM;
4507 goto error;
4508 }
4509 /* Receive var. len. data */
4510 DBG("Receiving var len data from client ...");
4511 ret = lttcomm_recv_unix_sock(sock, bytecode,
4512 cmd_ctx->lsm->u.filter.bytecode_len);
4513 if (ret <= 0) {
4514 DBG("Nothing recv() from client var len data... continuing");
4515 *sock_error = 1;
4516 ret = LTTCOMM_FILTER_INVAL;
4517 goto error;
4518 }
4519
4520 if (bytecode->len + sizeof(*bytecode)
4521 != cmd_ctx->lsm->u.filter.bytecode_len) {
4522 free(bytecode);
4523 ret = LTTCOMM_FILTER_INVAL;
4524 goto error;
4525 }
4526
4527 ret = cmd_set_filter(cmd_ctx->session, cmd_ctx->lsm->domain.type,
4528 cmd_ctx->lsm->u.filter.channel_name,
4529 cmd_ctx->lsm->u.filter.event_name,
4530 bytecode);
4531 break;
4532 }
5e16da05 4533 default:
5e16da05 4534 ret = LTTCOMM_UND;
5461b305 4535 break;
fac6795d
DG
4536 }
4537
5461b305 4538error:
5461b305
DG
4539 if (cmd_ctx->llm == NULL) {
4540 DBG("Missing llm structure. Allocating one.");
894be886 4541 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
4542 goto setup_error;
4543 }
4544 }
54d01ffb 4545 /* Set return code */
5461b305 4546 cmd_ctx->llm->ret_code = ret;
5461b305 4547setup_error:
b5541356 4548 if (cmd_ctx->session) {
54d01ffb 4549 session_unlock(cmd_ctx->session);
b5541356 4550 }
256a5576
MD
4551 if (need_tracing_session) {
4552 session_unlock_list();
4553 }
54d01ffb 4554init_setup_error:
8028d920 4555 return ret;
fac6795d
DG
4556}
4557
1d4b027a 4558/*
d063d709
DG
4559 * This thread manage all clients request using the unix client socket for
4560 * communication.
1d4b027a
DG
4561 */
4562static void *thread_manage_clients(void *data)
4563{
a4b35e07 4564 int sock = -1, ret, i, pollfd;
53a80697 4565 int sock_error;
5eb91c98 4566 uint32_t revents, nb_fd;
273ea72c 4567 struct command_ctx *cmd_ctx = NULL;
5eb91c98 4568 struct lttng_poll_event events;
1d4b027a
DG
4569
4570 DBG("[thread] Manage client started");
4571
f6a9efaa
DG
4572 rcu_register_thread();
4573
1d4b027a
DG
4574 ret = lttcomm_listen_unix_sock(client_sock);
4575 if (ret < 0) {
4576 goto error;
4577 }
4578
5eb91c98
DG
4579 /*
4580 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4581 * more will be added to this poll set.
4582 */
4583 ret = create_thread_poll_set(&events, 2);
4584 if (ret < 0) {
4585 goto error;
4586 }
273ea72c 4587
5eb91c98
DG
4588 /* Add the application registration socket */
4589 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
4590 if (ret < 0) {
4591 goto error;
4592 }
273ea72c 4593
bbd973c2
DG
4594 /*
4595 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
4596 */
4597 if (opt_sig_parent) {
8db8d1dc 4598 kill(ppid, SIGUSR1);
1d4b027a
DG
4599 }
4600
4601 while (1) {
1d4b027a 4602 DBG("Accepting client command ...");
273ea72c 4603
5eb91c98
DG
4604 nb_fd = LTTNG_POLL_GETNB(&events);
4605
273ea72c 4606 /* Inifinite blocking call, waiting for transmission */
88f2b785 4607 restart:
5eb91c98 4608 ret = lttng_poll_wait(&events, -1);
273ea72c 4609 if (ret < 0) {
88f2b785
MD
4610 /*
4611 * Restart interrupted system call.
4612 */
4613 if (errno == EINTR) {
4614 goto restart;
4615 }
273ea72c
DG
4616 goto error;
4617 }
4618
5eb91c98
DG
4619 for (i = 0; i < nb_fd; i++) {
4620 /* Fetch once the poll data */
4621 revents = LTTNG_POLL_GETEV(&events, i);
4622 pollfd = LTTNG_POLL_GETFD(&events, i);
4623
4624 /* Thread quit pipe has been closed. Killing thread. */
4625 ret = check_thread_quit_pipe(pollfd, revents);
4626 if (ret) {
4627 goto error;
4628 }
4629
4630 /* Event on the registration socket */
4631 if (pollfd == client_sock) {
4632 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
4633 ERR("Client socket poll error");
4634 goto error;
4635 }
4636 }
4637 }
4638
4639 DBG("Wait for client response");
4640
4641 sock = lttcomm_accept_unix_sock(client_sock);
4642 if (sock < 0) {
273ea72c 4643 goto error;
273ea72c
DG
4644 }
4645
be040666
DG
4646 /* Set socket option for credentials retrieval */
4647 ret = lttcomm_setsockopt_creds_unix_sock(sock);
4648 if (ret < 0) {
4649 goto error;
4650 }
4651
5eb91c98 4652 /* Allocate context command to process the client request */
ba7f0ae5 4653 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 4654 if (cmd_ctx == NULL) {
76d7553f 4655 PERROR("zmalloc cmd_ctx");
1d4b027a 4656 goto error;
5eb91c98 4657 }
1d4b027a 4658
5eb91c98 4659 /* Allocate data buffer for reception */
ba7f0ae5 4660 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 4661 if (cmd_ctx->lsm == NULL) {
76d7553f 4662 PERROR("zmalloc cmd_ctx->lsm");
5eb91c98
DG
4663 goto error;
4664 }
1d4b027a 4665
5eb91c98
DG
4666 cmd_ctx->llm = NULL;
4667 cmd_ctx->session = NULL;
1d4b027a 4668
5eb91c98
DG
4669 /*
4670 * Data is received from the lttng client. The struct
4671 * lttcomm_session_msg (lsm) contains the command and data request of
4672 * the client.
4673 */
4674 DBG("Receiving data from client ...");
be040666
DG
4675 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
4676 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG
4677 if (ret <= 0) {
4678 DBG("Nothing recv() from client... continuing");
76d7553f
MD
4679 ret = close(sock);
4680 if (ret) {
4681 PERROR("close");
4682 }
4683 sock = -1;
a2c0da86 4684 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
4685 continue;
4686 }
1d4b027a 4687
5eb91c98
DG
4688 // TODO: Validate cmd_ctx including sanity check for
4689 // security purpose.
f7776ea7 4690
f6a9efaa 4691 rcu_thread_online();
5eb91c98
DG
4692 /*
4693 * This function dispatch the work to the kernel or userspace tracer
4694 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4695 * informations for the client. The command context struct contains
4696 * everything this function may needs.
4697 */
53a80697 4698 ret = process_client_msg(cmd_ctx, sock, &sock_error);
f6a9efaa 4699 rcu_thread_offline();
5eb91c98 4700 if (ret < 0) {
53a80697
MD
4701 if (sock_error) {
4702 ret = close(sock);
4703 if (ret) {
4704 PERROR("close");
4705 }
4706 sock = -1;
4707 }
bbd973c2 4708 /*
5eb91c98 4709 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 4710 * this point, ret < 0 means that a zmalloc failed
53a80697
MD
4711 * (ENOMEM). Error detected but still accept
4712 * command, unless a socket error has been
4713 * detected.
bbd973c2 4714 */
bbd973c2 4715 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
4716 continue;
4717 }
d6e4fca4 4718
54d01ffb
DG
4719 DBG("Sending response (size: %d, retcode: %s)",
4720 cmd_ctx->lttng_msg_size,
9a745bc7 4721 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 4722 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
4723 if (ret < 0) {
4724 ERR("Failed to send data back to client");
bbd973c2 4725 }
1d4b027a 4726
5eb91c98 4727 /* End of transmission */
76d7553f
MD
4728 ret = close(sock);
4729 if (ret) {
4730 PERROR("close");
4731 }
4732 sock = -1;
be040666
DG
4733
4734 clean_command_ctx(&cmd_ctx);
273ea72c
DG
4735 }
4736
5eb91c98
DG
4737error:
4738 DBG("Client thread dying");
273ea72c 4739 unlink(client_unix_sock_path);
76d7553f
MD
4740 if (client_sock >= 0) {
4741 ret = close(client_sock);
4742 if (ret) {
4743 PERROR("close");
4744 }
a4b35e07
MD
4745 }
4746 if (sock >= 0) {
76d7553f
MD
4747 ret = close(sock);
4748 if (ret) {
4749 PERROR("close");
4750 }
a4b35e07 4751 }
273ea72c 4752
5eb91c98 4753 lttng_poll_clean(&events);
a2fb29a5 4754 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG
4755
4756 rcu_unregister_thread();
1d4b027a
DG
4757 return NULL;
4758}
4759
4760
fac6795d
DG
4761/*
4762 * usage function on stderr
4763 */
4764static void usage(void)
4765{
b716ce68 4766 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
4767 fprintf(stderr, " -h, --help Display this usage.\n");
4768 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
4769 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
4770 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
4771 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD
4772 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
4773 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
4774 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
4775 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD
4776 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
4777 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
4778 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
4779 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG
4780 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
4781 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
4782 fprintf(stderr, " -V, --version Show version number.\n");
4783 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
4784 fprintf(stderr, " -q, --quiet No output at all.\n");
4785 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 4786 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 4787 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG
4788}
4789
4790/*
4791 * daemon argument parsing
4792 */
4793static int parse_args(int argc, char **argv)
4794{
4795 int c;
4796
4797 static struct option long_options[] = {
4798 { "client-sock", 1, 0, 'c' },
4799 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD
4800 { "kconsumerd-cmd-sock", 1, 0, 'C' },
4801 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD
4802 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
4803 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD
4804 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
4805 { "ustconsumerd64-err-sock", 1, 0, 'F' },
4806 { "consumerd32-path", 1, 0, 'u' },
4807 { "consumerd32-libdir", 1, 0, 'U' },
4808 { "consumerd64-path", 1, 0, 't' },
4809 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 4810 { "daemonize", 0, 0, 'd' },
5b8719f5 4811 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
4812 { "help", 0, 0, 'h' },
4813 { "group", 1, 0, 'g' },
4814 { "version", 0, 0, 'V' },
75462a81 4815 { "quiet", 0, 0, 'q' },
3f9947db 4816 { "verbose", 0, 0, 'v' },
3bd1e081 4817 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 4818 { "no-kernel", 0, 0, 'N' },
fac6795d
DG
4819 { NULL, 0, 0, 0 }
4820 };
4821
4822 while (1) {
4823 int option_index = 0;
4fba7219 4824 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 4825 long_options, &option_index);
fac6795d
DG
4826 if (c == -1) {
4827 break;
4828 }
4829
4830 switch (c) {
4831 case 0:
4832 fprintf(stderr, "option %s", long_options[option_index].name);
4833 if (optarg) {
4834 fprintf(stderr, " with arg %s\n", optarg);
4835 }
4836 break;
b716ce68 4837 case 'c':
fac6795d
DG
4838 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
4839 break;
4840 case 'a':
4841 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
4842 break;
4843 case 'd':
4844 opt_daemon = 1;
4845 break;
4846 case 'g':
fb09408a 4847 opt_tracing_group = optarg;
fac6795d
DG
4848 break;
4849 case 'h':
4850 usage();
4851 exit(EXIT_FAILURE);
4852 case 'V':
4853 fprintf(stdout, "%s\n", VERSION);
4854 exit(EXIT_SUCCESS);
5b8719f5
DG
4855 case 'S':
4856 opt_sig_parent = 1;
4857 break;
d6f42150 4858 case 'E':
3bd1e081 4859 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG
4860 break;
4861 case 'C':
3bd1e081
MD
4862 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
4863 break;
4864 case 'F':
7753dea8 4865 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD
4866 break;
4867 case 'D':
7753dea8
MD
4868 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
4869 break;
4870 case 'H':
4871 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
4872 break;
4873 case 'G':
4874 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 4875 break;
4fba7219
DG
4876 case 'N':
4877 opt_no_kernel = 1;
4878 break;
75462a81 4879 case 'q':
97e19046 4880 lttng_opt_quiet = 1;
75462a81 4881 break;
3f9947db 4882 case 'v':
53086306 4883 /* Verbose level can increase using multiple -v */
97e19046 4884 lttng_opt_verbose += 1;
3f9947db 4885 break;
31f73cc9 4886 case 'Z':
3bd1e081 4887 opt_verbose_consumer += 1;
31f73cc9 4888 break;
fb09408a 4889 case 'u':
fc7a59ce 4890 consumerd32_bin= optarg;
ebaeda94
MD
4891 break;
4892 case 'U':
4893 consumerd32_libdir = optarg;
7753dea8
MD
4894 break;
4895 case 't':
fc7a59ce 4896 consumerd64_bin = optarg;
ebaeda94
MD
4897 break;
4898 case 'T':
4899 consumerd64_libdir = optarg;
fb09408a 4900 break;
fac6795d
DG
4901 default:
4902 /* Unknown option or other error.
4903 * Error is printed by getopt, just return */
4904 return -1;
4905 }
4906 }
4907
4908 return 0;
4909}
4910
4911/*
d063d709 4912 * Creates the two needed socket by the daemon.
d6f42150
DG
4913 * apps_sock - The communication socket for all UST apps.
4914 * client_sock - The communication of the cli tool (lttng).
fac6795d 4915 */
cf3af59e 4916static int init_daemon_socket(void)
fac6795d
DG
4917{
4918 int ret = 0;
4919 mode_t old_umask;
4920
4921 old_umask = umask(0);
4922
4923 /* Create client tool unix socket */
d6f42150
DG
4924 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4925 if (client_sock < 0) {
4926 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
4927 ret = -1;
4928 goto end;
4929 }
4930
4931 /* File permission MUST be 660 */
4932 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4933 if (ret < 0) {
d6f42150 4934 ERR("Set file permissions failed: %s", client_unix_sock_path);
76d7553f 4935 PERROR("chmod");
fac6795d
DG
4936 goto end;
4937 }
4938
4939 /* Create the application unix socket */
d6f42150
DG
4940 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4941 if (apps_sock < 0) {
4942 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
4943 ret = -1;
4944 goto end;
4945 }
4946
d6f42150 4947 /* File permission MUST be 666 */
54d01ffb
DG
4948 ret = chmod(apps_unix_sock_path,
4949 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 4950 if (ret < 0) {
d6f42150 4951 ERR("Set file permissions failed: %s", apps_unix_sock_path);
76d7553f 4952 PERROR("chmod");
fac6795d
DG
4953 goto end;
4954 }
4955
4956end:
4957 umask(old_umask);
4958 return ret;
4959}
4960
4961/*
54d01ffb
DG
4962 * Check if the global socket is available, and if a daemon is answering at the
4963 * other side. If yes, error is returned.
fac6795d 4964 */
cf3af59e 4965static int check_existing_daemon(void)
fac6795d 4966{
7d8234d9 4967 /* Is there anybody out there ? */
099e26bd 4968 if (lttng_session_daemon_alive()) {
7d8234d9 4969 return -EEXIST;
099e26bd 4970 }
b09c7c76
DG
4971
4972 return 0;
fac6795d
DG
4973}
4974
fac6795d 4975/*
d063d709 4976 * Set the tracing group gid onto the client socket.
5e16da05 4977 *
d063d709 4978 * Race window between mkdir and chown is OK because we are going from more
d1613cf5 4979 * permissive (root.root) to less permissive (root.tracing).
fac6795d 4980 */
be040666 4981static int set_permissions(char *rundir)
fac6795d
DG
4982{
4983 int ret;
996b65c8 4984 gid_t gid;
fac6795d 4985
6775595e
DG
4986 ret = allowed_group();
4987 if (ret < 0) {
be040666
DG
4988 WARN("No tracing group detected");
4989 ret = 0;
fac6795d
DG
4990 goto end;
4991 }
4992
6775595e
DG
4993 gid = ret;
4994
d6f42150 4995 /* Set lttng run dir */
be040666 4996 ret = chown(rundir, 0, gid);
d6f42150 4997 if (ret < 0) {
be040666 4998 ERR("Unable to set group on %s", rundir);
76d7553f 4999 PERROR("chown");
d6f42150
DG
5000 }
5001
d1613cf5 5002 /* Ensure tracing group can search the run dir */
61076f74 5003 ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
d1613cf5
JN
5004 if (ret < 0) {
5005 ERR("Unable to set permissions on %s", rundir);
76d7553f 5006 PERROR("chmod");
d1613cf5
JN
5007 }
5008
d6f42150 5009 /* lttng client socket path */
996b65c8 5010 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 5011 if (ret < 0) {
d6f42150 5012 ERR("Unable to set group on %s", client_unix_sock_path);
76d7553f 5013 PERROR("chown");
d6f42150
DG
5014 }
5015
3bd1e081
MD
5016 /* kconsumer error socket path */
5017 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 5018 if (ret < 0) {
3bd1e081 5019 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
76d7553f 5020 PERROR("chown");
3bd1e081
MD
5021 }
5022
7753dea8
MD
5023 /* 64-bit ustconsumer error socket path */
5024 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
5025 if (ret < 0) {
5026 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
76d7553f 5027 PERROR("chown");
7753dea8
MD
5028 }
5029
5030 /* 32-bit ustconsumer compat32 error socket path */
5031 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 5032 if (ret < 0) {
7753dea8 5033 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
76d7553f 5034 PERROR("chown");
fac6795d
DG
5035 }
5036
d6f42150 5037 DBG("All permissions are set");
e07ae692 5038
fac6795d
DG
5039end:
5040 return ret;
5041}
5042
d6f42150 5043/*
d063d709 5044 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 5045 */
67e40797 5046static int create_lttng_rundir(const char *rundir)
d6f42150
DG
5047{
5048 int ret;
5049
67e40797
DG
5050 DBG3("Creating LTTng run directory: %s", rundir);
5051
d1613cf5 5052 ret = mkdir(rundir, S_IRWXU);
d6f42150 5053 if (ret < 0) {
b1f11e69 5054 if (errno != EEXIST) {
67e40797 5055 ERR("Unable to create %s", rundir);
b1f11e69
DG
5056 goto error;
5057 } else {
5058 ret = 0;
5059 }
d6f42150
DG
5060 }
5061
5062error:
5063 return ret;
5064}
5065
5066/*
d063d709
DG
5067 * Setup sockets and directory needed by the kconsumerd communication with the
5068 * session daemon.
d6f42150 5069 */
67e40797
DG
5070static int set_consumer_sockets(struct consumer_data *consumer_data,
5071 const char *rundir)
d6f42150
DG
5072{
5073 int ret;
67e40797 5074 char path[PATH_MAX];
d6f42150 5075
67e40797 5076 switch (consumer_data->type) {
7753dea8 5077 case LTTNG_CONSUMER_KERNEL:
60922cb0 5078 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD
5079 break;
5080 case LTTNG_CONSUMER64_UST:
60922cb0 5081 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD
5082 break;
5083 case LTTNG_CONSUMER32_UST:
60922cb0 5084 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD
5085 break;
5086 default:
5087 ERR("Consumer type unknown");
5088 ret = -EINVAL;
5089 goto error;
d6f42150
DG
5090 }
5091
67e40797
DG
5092 DBG2("Creating consumer directory: %s", path);
5093
d1613cf5 5094 ret = mkdir(path, S_IRWXU);
d6f42150 5095 if (ret < 0) {
6beb2242 5096 if (errno != EEXIST) {
f11e84c2 5097 PERROR("mkdir");
3bd1e081 5098 ERR("Failed to create %s", path);
6beb2242
DG
5099 goto error;
5100 }
f11e84c2 5101 ret = -1;
d6f42150
DG
5102 }
5103
5104 /* Create the kconsumerd error unix socket */
3bd1e081
MD
5105 consumer_data->err_sock =
5106 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
5107 if (consumer_data->err_sock < 0) {
5108 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG
5109 ret = -1;
5110 goto error;
5111 }
5112
5113 /* File permission MUST be 660 */
3bd1e081 5114 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 5115 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 5116 if (ret < 0) {
3bd1e081 5117 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 5118 PERROR("chmod");
d6f42150
DG
5119 goto error;
5120 }
5121
5122error:
5123 return ret;
5124}
5125
fac6795d 5126/*
d063d709 5127 * Signal handler for the daemon
cf3af59e 5128 *
54d01ffb
DG
5129 * Simply stop all worker threads, leaving main() return gracefully after
5130 * joining all threads and calling cleanup().
fac6795d
DG
5131 */
5132static void sighandler(int sig)
5133{
5134 switch (sig) {
cf3af59e 5135 case SIGPIPE:
af87c45a 5136 DBG("SIGPIPE caught");
cf3af59e
MD
5137 return;
5138 case SIGINT:
af87c45a 5139 DBG("SIGINT caught");
cf3af59e
MD
5140 stop_threads();
5141 break;
5142 case SIGTERM:
af87c45a 5143 DBG("SIGTERM caught");
cf3af59e
MD
5144 stop_threads();
5145 break;
5146 default:
5147 break;
fac6795d 5148 }
fac6795d
DG
5149}
5150
5151/*
d063d709 5152 * Setup signal handler for :
1d4b027a 5153 * SIGINT, SIGTERM, SIGPIPE
fac6795d 5154 */
1d4b027a 5155static int set_signal_handler(void)
fac6795d 5156{
1d4b027a
DG
5157 int ret = 0;
5158 struct sigaction sa;
5159 sigset_t sigset;
fac6795d 5160
1d4b027a 5161 if ((ret = sigemptyset(&sigset)) < 0) {
76d7553f 5162 PERROR("sigemptyset");
1d4b027a
DG
5163 return ret;
5164 }
d6f42150 5165
1d4b027a
DG
5166 sa.sa_handler = sighandler;
5167 sa.sa_mask = sigset;
5168 sa.sa_flags = 0;
5169 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
76d7553f 5170 PERROR("sigaction");
1d4b027a 5171 return ret;
d6f42150
DG
5172 }
5173
1d4b027a 5174 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
76d7553f 5175 PERROR("sigaction");
1d4b027a 5176 return ret;
d6f42150 5177 }
aaf26714 5178
1d4b027a 5179 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
76d7553f 5180 PERROR("sigaction");
1d4b027a 5181 return ret;
8c0faa1d
DG
5182 }
5183
1d4b027a
DG
5184 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
5185
5186 return ret;
fac6795d
DG
5187}
5188
f3ed775e 5189/*
d063d709
DG
5190 * Set open files limit to unlimited. This daemon can open a large number of
5191 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
5192 */
5193static void set_ulimit(void)
5194{
5195 int ret;
5196 struct rlimit lim;
5197
a88df331 5198 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
5199 lim.rlim_cur = 65535;
5200 lim.rlim_max = 65535;
5201
5202 ret = setrlimit(RLIMIT_NOFILE, &lim);
5203 if (ret < 0) {
76d7553f 5204 PERROR("failed to set open files limit");
f3ed775e
DG
5205 }
5206}
5207
fac6795d
DG
5208/*
5209 * main
5210 */
5211int main(int argc, char **argv)
5212{
fac6795d
DG
5213 int ret = 0;
5214 void *status;
b082db07 5215 const char *home_path;
fac6795d 5216
335a95b7
MD
5217 init_kernel_workarounds();
5218
f6a9efaa
DG
5219 rcu_register_thread();
5220
7753dea8 5221 setup_consumerd_path();
fb09408a 5222
fac6795d
DG
5223 /* Parse arguments */
5224 progname = argv[0];
5225 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 5226 goto error;
fac6795d
DG
5227 }
5228
5229 /* Daemonize */
5230 if (opt_daemon) {
ceed52b5
MD
5231 int i;
5232
5233 /*
5234 * fork
5235 * child: setsid, close FD 0, 1, 2, chdir /
5236 * parent: exit (if fork is successful)
5237 */
53094c05
DG
5238 ret = daemon(0, 0);
5239 if (ret < 0) {
76d7553f 5240 PERROR("daemon");
cf3af59e 5241 goto error;
53094c05 5242 }
ceed52b5
MD
5243 /*
5244 * We are in the child. Make sure all other file
5245 * descriptors are closed, in case we are called with
5246 * more opened file descriptors than the standard ones.
5247 */
5248 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
5249 (void) close(i);
5250 }
5251 }
5252
5253 /* Create thread quit pipe */
5254 if ((ret = init_thread_quit_pipe()) < 0) {
5255 goto error;
fac6795d
DG
5256 }
5257
5258 /* Check if daemon is UID = 0 */
5259 is_root = !getuid();
5260
fac6795d 5261 if (is_root) {
990570ed 5262 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG
5263
5264 /* Create global run dir with root access */
5265 ret = create_lttng_rundir(rundir);
d6f42150 5266 if (ret < 0) {
cf3af59e 5267 goto error;
d6f42150
DG
5268 }
5269
fac6795d 5270 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
5271 snprintf(apps_unix_sock_path, PATH_MAX,
5272 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
5273 }
5274
5275 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
5276 snprintf(client_unix_sock_path, PATH_MAX,
5277 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
5278 }
0fdd1e2c
DG
5279
5280 /* Set global SHM for ust */
5281 if (strlen(wait_shm_path) == 0) {
5282 snprintf(wait_shm_path, PATH_MAX,
5283 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
5284 }
67e40797
DG
5285
5286 /* Setup kernel consumerd path */
5287 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 5288 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 5289 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 5290 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG
5291
5292 DBG2("Kernel consumer err path: %s",
5293 kconsumer_data.err_unix_sock_path);
5294 DBG2("Kernel consumer cmd path: %s",
5295 kconsumer_data.cmd_unix_sock_path);
fac6795d 5296 } else {
b082db07
DG
5297 home_path = get_home_dir();
5298 if (home_path == NULL) {
273ea72c
DG
5299 /* TODO: Add --socket PATH option */
5300 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD
5301 ret = -EPERM;
5302 goto error;
b082db07
DG
5303 }
5304
67e40797
DG
5305 /*
5306 * Create rundir from home path. This will create something like
5307 * $HOME/.lttng
5308 */
990570ed 5309 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG
5310 if (ret < 0) {
5311 ret = -ENOMEM;
5312 goto error;
5313 }
5314
5315 ret = create_lttng_rundir(rundir);
5316 if (ret < 0) {
5317 goto error;
5318 }
5319
fac6795d 5320 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 5321 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 5322 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
5323 }
5324
5325 /* Set the cli tool unix socket path */
5326 if (strlen(client_unix_sock_path) == 0) {
d6f42150 5327 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 5328 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 5329 }
0fdd1e2c
DG
5330
5331 /* Set global SHM for ust */
5332 if (strlen(wait_shm_path) == 0) {
5333 snprintf(wait_shm_path, PATH_MAX,
5334 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
5335 }
fac6795d
DG
5336 }
5337
5c827ce0
DG
5338 /* Set consumer initial state */
5339 kernel_consumerd_state = CONSUMER_STOPPED;
5340 ust_consumerd_state = CONSUMER_STOPPED;
5341
847177cd
DG
5342 DBG("Client socket path %s", client_unix_sock_path);
5343 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG
5344 DBG("LTTng run directory path: %s", rundir);
5345
5346 /* 32 bits consumerd path setup */
5347 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 5348 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 5349 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 5350 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG
5351
5352 DBG2("UST consumer 32 bits err path: %s",
5353 ustconsumer32_data.err_unix_sock_path);
5354 DBG2("UST consumer 32 bits cmd path: %s",
5355 ustconsumer32_data.cmd_unix_sock_path);
5356
5357 /* 64 bits consumerd path setup */
5358 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 5359 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 5360 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 5361 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG
5362
5363 DBG2("UST consumer 64 bits err path: %s",
5364 ustconsumer64_data.err_unix_sock_path);
5365 DBG2("UST consumer 64 bits cmd path: %s",
5366 ustconsumer64_data.cmd_unix_sock_path);
847177cd 5367
273ea72c 5368 /*
7d8234d9 5369 * See if daemon already exist.
fac6795d 5370 */
7d8234d9 5371 if ((ret = check_existing_daemon()) < 0) {
75462a81 5372 ERR("Already running daemon.\n");
273ea72c 5373 /*
cf3af59e
MD
5374 * We do not goto exit because we must not cleanup()
5375 * because a daemon is already running.
ab118b20 5376 */
cf3af59e 5377 goto error;
a88df331
DG
5378 }
5379
1427f9b2
DG
5380 /*
5381 * Init UST app hash table. Alloc hash table before this point since
5382 * cleanup() can get called after that point.
5383 */
5384 ust_app_ht_alloc();
5385
54d01ffb 5386 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG
5387
5388 /*
5389 * These actions must be executed as root. We do that *after* setting up
5390 * the sockets path because we MUST make the check for another daemon using
5391 * those paths *before* trying to set the kernel consumer sockets and init
5392 * kernel tracer.
5393 */
5394 if (is_root) {
67e40797 5395 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD
5396 if (ret < 0) {
5397 goto exit;
5398 }
5399
a88df331 5400 /* Setup kernel tracer */
4fba7219
DG
5401 if (!opt_no_kernel) {
5402 init_kernel_tracer();
5403 }
a88df331
DG
5404
5405 /* Set ulimit for open files */
5406 set_ulimit();
fac6795d 5407 }
4063050c
MD
5408 /* init lttng_fd tracking must be done after set_ulimit. */
5409 lttng_fd_init();
fac6795d 5410
67e40797
DG
5411 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
5412 if (ret < 0) {
5413 goto exit;
5414 }
5415
5416 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
5417 if (ret < 0) {
5418 goto exit;
5419 }
5420
cf3af59e
MD
5421 if ((ret = set_signal_handler()) < 0) {
5422 goto exit;
fac6795d
DG
5423 }
5424
d6f42150 5425 /* Setup the needed unix socket */
cf3af59e
MD
5426 if ((ret = init_daemon_socket()) < 0) {
5427 goto exit;
fac6795d
DG
5428 }
5429
5430 /* Set credentials to socket */
be040666 5431 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 5432 goto exit;
fac6795d
DG
5433 }
5434
5b8719f5
DG
5435 /* Get parent pid if -S, --sig-parent is specified. */
5436 if (opt_sig_parent) {
5437 ppid = getppid();
5438 }
5439
7a485870 5440 /* Setup the kernel pipe for waking up the kernel thread */
ef599319 5441 if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) {
cf3af59e 5442 goto exit;
7a485870
DG
5443 }
5444
099e26bd 5445 /* Setup the thread apps communication pipe. */
ef599319 5446 if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) {
099e26bd
DG
5447 goto exit;
5448 }
5449
5450 /* Init UST command queue. */
5451 cds_wfq_init(&ust_cmd_queue.queue);
5452
273ea72c 5453 /*
54d01ffb
DG
5454 * Get session list pointer. This pointer MUST NOT be free(). This list is
5455 * statically declared in session.c
273ea72c 5456 */
54d01ffb 5457 session_list_ptr = session_get_list();
b5541356 5458
5eb91c98
DG
5459 /* Set up max poll set size */
5460 lttng_poll_set_max_size();
5461
00e2e675
DG
5462 /*
5463 * Set network sequence index to 1 for streams to match a relayd socket on
5464 * the consumer side.
5465 */
5466 uatomic_set(&relayd_net_seq_idx, 1);
5467
cf3af59e 5468 /* Create thread to manage the client socket */
099e26bd
DG
5469 ret = pthread_create(&client_thread, NULL,
5470 thread_manage_clients, (void *) NULL);
cf3af59e 5471 if (ret != 0) {
76d7553f 5472 PERROR("pthread_create clients");
cf3af59e
MD
5473 goto exit_client;
5474 }
fac6795d 5475
099e26bd
DG
5476 /* Create thread to dispatch registration */
5477 ret = pthread_create(&dispatch_thread, NULL,
5478 thread_dispatch_ust_registration, (void *) NULL);
5479 if (ret != 0) {
76d7553f 5480 PERROR("pthread_create dispatch");
099e26bd
DG
5481 goto exit_dispatch;
5482 }
5483
5484 /* Create thread to manage application registration. */
5485 ret = pthread_create(&reg_apps_thread, NULL,
5486 thread_registration_apps, (void *) NULL);
5487 if (ret != 0) {
76d7553f 5488 PERROR("pthread_create registration");
099e26bd
DG
5489 goto exit_reg_apps;
5490 }
5491
cf3af59e 5492 /* Create thread to manage application socket */
54d01ffb
DG
5493 ret = pthread_create(&apps_thread, NULL,
5494 thread_manage_apps, (void *) NULL);
cf3af59e 5495 if (ret != 0) {
76d7553f 5496 PERROR("pthread_create apps");
cf3af59e
MD
5497 goto exit_apps;
5498 }
fac6795d 5499
cf3af59e 5500 /* Create kernel thread to manage kernel event */
54d01ffb
DG
5501 ret = pthread_create(&kernel_thread, NULL,
5502 thread_manage_kernel, (void *) NULL);
cf3af59e 5503 if (ret != 0) {
76d7553f 5504 PERROR("pthread_create kernel");
cf3af59e
MD
5505 goto exit_kernel;
5506 }
7a485870 5507
cf3af59e
MD
5508 ret = pthread_join(kernel_thread, &status);
5509 if (ret != 0) {
76d7553f 5510 PERROR("pthread_join");
cf3af59e 5511 goto error; /* join error, exit without cleanup */
fac6795d
DG
5512 }
5513
cf3af59e
MD
5514exit_kernel:
5515 ret = pthread_join(apps_thread, &status);
5516 if (ret != 0) {
76d7553f 5517 PERROR("pthread_join");
cf3af59e
MD
5518 goto error; /* join error, exit without cleanup */
5519 }
fac6795d 5520
cf3af59e 5521exit_apps:
099e26bd
DG
5522 ret = pthread_join(reg_apps_thread, &status);
5523 if (ret != 0) {
76d7553f 5524 PERROR("pthread_join");
099e26bd
DG
5525 goto error; /* join error, exit without cleanup */
5526 }
5527
5528exit_reg_apps:
5529 ret = pthread_join(dispatch_thread, &status);
5530 if (ret != 0) {
76d7553f 5531 PERROR("pthread_join");
099e26bd
DG
5532 goto error; /* join error, exit without cleanup */
5533 }
5534
5535exit_dispatch:
cf3af59e
MD
5536 ret = pthread_join(client_thread, &status);
5537 if (ret != 0) {
76d7553f 5538 PERROR("pthread_join");
cf3af59e
MD
5539 goto error; /* join error, exit without cleanup */
5540 }
5541
3bd1e081 5542 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 5543 if (ret != 0) {
76d7553f 5544 PERROR("join_consumer");
cf3af59e
MD
5545 goto error; /* join error, exit without cleanup */
5546 }
a88df331 5547
cf3af59e 5548exit_client:
a88df331 5549exit:
cf3af59e
MD
5550 /*
5551 * cleanup() is called when no other thread is running.
5552 */
f6a9efaa 5553 rcu_thread_online();
cf3af59e 5554 cleanup();
f6a9efaa
DG
5555 rcu_thread_offline();
5556 rcu_unregister_thread();
67e40797 5557 if (!ret) {
cf3af59e 5558 exit(EXIT_SUCCESS);
67e40797 5559 }
cf3af59e 5560error:
5e16da05 5561 exit(EXIT_FAILURE);
fac6795d 5562}
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