Fix: hash table cleanup call_rcu deadlock
[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>
24#include <signal.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
331744e3 28#include <inttypes.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>
d27c42b8 41#include <common/compat/socket.h>
db758600
DG
42#include <common/defaults.h>
43#include <common/kernel-consumer/kernel-consumer.h>
50c8f484 44#include <common/futex.h>
00e2e675 45#include <common/relayd/relayd.h>
81b86775 46#include <common/utils.h>
fac6795d 47
10a8a223 48#include "lttng-sessiond.h"
7972aab2 49#include "buffer-registry.h"
54d01ffb 50#include "channel.h"
2f77fc4b 51#include "cmd.h"
00e2e675 52#include "consumer.h"
099e26bd 53#include "context.h"
54d01ffb 54#include "event.h"
4771f025 55#include "kernel.h"
f1e16794 56#include "kernel-consumer.h"
096102bd 57#include "modprobe.h"
0fdd1e2c 58#include "shm.h"
1e307fab 59#include "ust-ctl.h"
00e2e675 60#include "ust-consumer.h"
8e68d1c8 61#include "utils.h"
4063050c 62#include "fd-limit.h"
44a5e5eb 63#include "health.h"
8ac94142 64#include "testpoint.h"
d0b96690 65#include "ust-thread.h"
fac6795d 66
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MD
67#define CONSUMERD_FILE "lttng-consumerd"
68
75462a81 69/* Const values */
bbccc3d2 70const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab 71
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DG
72const char *progname;
73const char *opt_tracing_group;
35f90c40 74static const char *opt_pidfile;
5b8719f5 75static int opt_sig_parent;
97e19046 76static int opt_verbose_consumer;
fac6795d 77static int opt_daemon;
4fba7219 78static int opt_no_kernel;
fac6795d 79static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 80static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 81static char *rundir;
3bd1e081 82
a23ec3a7
DG
83/*
84 * Consumer daemon specific control data. Every value not initialized here is
85 * set to 0 by the static definition.
86 */
3bd1e081
MD
87static struct consumer_data kconsumer_data = {
88 .type = LTTNG_CONSUMER_KERNEL,
60922cb0
DG
89 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
90 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
03550b58
MD
91 .err_sock = -1,
92 .cmd_sock = -1,
331744e3 93 .metadata_sock.fd = -1,
173af62f
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94 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
95 .lock = PTHREAD_MUTEX_INITIALIZER,
a23ec3a7
DG
96 .cond = PTHREAD_COND_INITIALIZER,
97 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
3bd1e081 98};
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MD
99static struct consumer_data ustconsumer64_data = {
100 .type = LTTNG_CONSUMER64_UST,
60922cb0
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101 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
03550b58
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103 .err_sock = -1,
104 .cmd_sock = -1,
331744e3 105 .metadata_sock.fd = -1,
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106 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
107 .lock = PTHREAD_MUTEX_INITIALIZER,
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108 .cond = PTHREAD_COND_INITIALIZER,
109 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
7753dea8
MD
110};
111static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
60922cb0
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113 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
03550b58
MD
115 .err_sock = -1,
116 .cmd_sock = -1,
331744e3 117 .metadata_sock.fd = -1,
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118 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
119 .lock = PTHREAD_MUTEX_INITIALIZER,
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120 .cond = PTHREAD_COND_INITIALIZER,
121 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
3bd1e081
MD
122};
123
26c9d55e 124/* Shared between threads */
099e26bd 125static int dispatch_thread_exit;
fac6795d 126
54d01ffb
DG
127/* Global application Unix socket path */
128static char apps_unix_sock_path[PATH_MAX];
129/* Global client Unix socket path */
130static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
131/* global wait shm path for UST */
132static char wait_shm_path[PATH_MAX];
44a5e5eb
DG
133/* Global health check unix path */
134static char health_unix_sock_path[PATH_MAX];
fac6795d 135
1d4b027a 136/* Sockets and FDs */
a4b35e07
MD
137static int client_sock = -1;
138static int apps_sock = -1;
2f77fc4b 139int kernel_tracer_fd = -1;
76d7553f 140static int kernel_poll_pipe[2] = { -1, -1 };
1d4b027a 141
273ea72c
DG
142/*
143 * Quit pipe for all threads. This permits a single cancellation point
144 * for all threads when receiving an event on the pipe.
145 */
76d7553f 146static int thread_quit_pipe[2] = { -1, -1 };
273ea72c 147
099e26bd
DG
148/*
149 * This pipe is used to inform the thread managing application communication
150 * that a command is queued and ready to be processed.
151 */
76d7553f 152static int apps_cmd_pipe[2] = { -1, -1 };
099e26bd 153
d0b96690
DG
154int apps_cmd_notify_pipe[2] = { -1, -1 };
155
1d4b027a 156/* Pthread, Mutexes and Semaphores */
1d4b027a 157static pthread_t apps_thread;
d0b96690 158static pthread_t apps_notify_thread;
099e26bd 159static pthread_t reg_apps_thread;
1d4b027a 160static pthread_t client_thread;
7a485870 161static pthread_t kernel_thread;
099e26bd 162static pthread_t dispatch_thread;
44a5e5eb 163static pthread_t health_thread;
0b2dc8df 164static pthread_t ht_cleanup_thread;
5eb91c98 165
099e26bd
DG
166/*
167 * UST registration command queue. This queue is tied with a futex and uses a N
168 * wakers / 1 waiter implemented and detailed in futex.c/.h
169 *
170 * The thread_manage_apps and thread_dispatch_ust_registration interact with
171 * this queue and the wait/wake scheme.
172 */
173static struct ust_cmd_queue ust_cmd_queue;
174
b5541356
DG
175/*
176 * Pointer initialized before thread creation.
177 *
178 * This points to the tracing session list containing the session count and a
179 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
180 * MUST NOT be taken if you call a public function in session.c.
04ea676f 181 *
d063d709 182 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 183 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
184 */
185static struct ltt_session_list *session_list_ptr;
186
7753dea8
MD
187int ust_consumerd64_fd = -1;
188int ust_consumerd32_fd = -1;
189
fb6f1fa2
YB
190static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
191static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
192static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
193static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a 194
2f77fc4b
DG
195static const char *module_proc_lttng = "/proc/lttng";
196
5c827ce0
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197/*
198 * Consumer daemon state which is changed when spawning it, killing it or in
199 * case of a fatal error.
200 */
201enum consumerd_state {
202 CONSUMER_STARTED = 1,
203 CONSUMER_STOPPED = 2,
204 CONSUMER_ERROR = 3,
205};
206
207/*
208 * This consumer daemon state is used to validate if a client command will be
209 * able to reach the consumer. If not, the client is informed. For instance,
210 * doing a "lttng start" when the consumer state is set to ERROR will return an
211 * error to the client.
212 *
213 * The following example shows a possible race condition of this scheme:
214 *
215 * consumer thread error happens
216 * client cmd arrives
217 * client cmd checks state -> still OK
218 * consumer thread exit, sets error
219 * client cmd try to talk to consumer
220 * ...
221 *
222 * However, since the consumer is a different daemon, we have no way of making
223 * sure the command will reach it safely even with this state flag. This is why
224 * we consider that up to the state validation during command processing, the
225 * command is safe. After that, we can not guarantee the correctness of the
226 * client request vis-a-vis the consumer.
227 */
228static enum consumerd_state ust_consumerd_state;
229static enum consumerd_state kernel_consumerd_state;
230
ae9e45b3
DG
231/*
232 * Socket timeout for receiving and sending in seconds.
233 */
234static int app_socket_timeout;
235
12744796
DG
236/* Set in main() with the current page size. */
237long page_size;
238
fb09408a 239static
7753dea8 240void setup_consumerd_path(void)
fb09408a 241{
fc7a59ce 242 const char *bin, *libdir;
fb09408a 243
7753dea8
MD
244 /*
245 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
246 * native architecture size consumer if CONFIG_CONSUMER*_PATH
247 * has not been defined.
7753dea8 248 */
ebaeda94 249#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
250 if (!consumerd32_bin[0]) {
251 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
252 }
253 if (!consumerd32_libdir[0]) {
254 consumerd32_libdir = INSTALL_LIB_PATH;
255 }
256#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
257 if (!consumerd64_bin[0]) {
258 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 259 }
ebaeda94
MD
260 if (!consumerd64_libdir[0]) {
261 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
262 }
263#else
264#error "Unknown bitness"
265#endif
266
fb09408a
MD
267 /*
268 * runtime env. var. overrides the build default.
269 */
fc7a59ce
AM
270 bin = getenv("LTTNG_CONSUMERD32_BIN");
271 if (bin) {
272 consumerd32_bin = bin;
7753dea8 273 }
fc7a59ce
AM
274 bin = getenv("LTTNG_CONSUMERD64_BIN");
275 if (bin) {
276 consumerd64_bin = bin;
ebaeda94 277 }
72f579ee 278 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
ebaeda94
MD
279 if (libdir) {
280 consumerd32_libdir = libdir;
281 }
72f579ee 282 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD
283 if (libdir) {
284 consumerd64_libdir = libdir;
fb09408a
MD
285 }
286}
287
5eb91c98
DG
288/*
289 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
290 */
d0b96690 291int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
5eb91c98
DG
292{
293 int ret;
294
d0b96690 295 assert(events);
5eb91c98
DG
296
297 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
298 if (ret < 0) {
299 goto error;
300 }
301
302 /* Add quit pipe */
d0b96690 303 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
5eb91c98
DG
304 if (ret < 0) {
305 goto error;
306 }
307
308 return 0;
309
310error:
311 return ret;
312}
313
314/*
315 * Check if the thread quit pipe was triggered.
316 *
317 * Return 1 if it was triggered else 0;
318 */
d0b96690 319int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
5eb91c98
DG
320{
321 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
322 return 1;
323 }
324
325 return 0;
326}
327
0fdd1e2c
DG
328/*
329 * Return group ID of the tracing group or -1 if not found.
330 */
996b65c8
MD
331static gid_t allowed_group(void)
332{
333 struct group *grp;
334
274e143b
MD
335 if (opt_tracing_group) {
336 grp = getgrnam(opt_tracing_group);
337 } else {
338 grp = getgrnam(default_tracing_group);
339 }
996b65c8
MD
340 if (!grp) {
341 return -1;
342 } else {
343 return grp->gr_gid;
344 }
345}
346
273ea72c 347/*
5eb91c98 348 * Init thread quit pipe.
273ea72c
DG
349 *
350 * Return -1 on error or 0 if all pipes are created.
351 */
352static int init_thread_quit_pipe(void)
353{
730389d9 354 int ret, i;
273ea72c 355
730389d9 356 ret = pipe(thread_quit_pipe);
273ea72c 357 if (ret < 0) {
730389d9 358 PERROR("thread quit pipe");
273ea72c
DG
359 goto error;
360 }
361
730389d9
DG
362 for (i = 0; i < 2; i++) {
363 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
364 if (ret < 0) {
365 PERROR("fcntl");
366 goto error;
367 }
368 }
369
273ea72c
DG
370error:
371 return ret;
372}
373
099e26bd
DG
374/*
375 * Stop all threads by closing the thread quit pipe.
376 */
cf3af59e
MD
377static void stop_threads(void)
378{
5eb91c98
DG
379 int ret;
380
cf3af59e
MD
381 /* Stopping all threads */
382 DBG("Terminating all threads");
54d01ffb 383 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
384 if (ret < 0) {
385 ERR("write error on thread quit pipe");
386 }
387
099e26bd 388 /* Dispatch thread */
26c9d55e 389 CMM_STORE_SHARED(dispatch_thread_exit, 1);
099e26bd 390 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
391}
392
fac6795d 393/*
d063d709 394 * Cleanup the daemon
fac6795d 395 */
cf3af59e 396static void cleanup(void)
fac6795d 397{
ef599319 398 int ret;
6620da75 399 char *cmd = NULL;
af9737e9 400 struct ltt_session *sess, *stmp;
fac6795d 401
1d4b027a 402 DBG("Cleaning up");
e07ae692 403
2f77fc4b
DG
404 /* First thing first, stop all threads */
405 utils_close_pipe(thread_quit_pipe);
406
35f90c40
DG
407 /*
408 * If opt_pidfile is undefined, the default file will be wiped when
409 * removing the rundir.
410 */
411 if (opt_pidfile) {
412 ret = remove(opt_pidfile);
413 if (ret < 0) {
414 PERROR("remove pidfile %s", opt_pidfile);
415 }
416 }
417
67e40797
DG
418 DBG("Removing %s directory", rundir);
419 ret = asprintf(&cmd, "rm -rf %s", rundir);
420 if (ret < 0) {
421 ERR("asprintf failed. Something is really wrong!");
422 }
5461b305 423
67e40797
DG
424 /* Remove lttng run directory */
425 ret = system(cmd);
426 if (ret < 0) {
427 ERR("Unable to clean %s", rundir);
1d4b027a 428 }
67e40797 429 free(cmd);
bd69add2 430 free(rundir);
5461b305 431
99bab54f 432 DBG("Cleaning up all sessions");
fac6795d 433
b5541356 434 /* Destroy session list mutex */
273ea72c
DG
435 if (session_list_ptr != NULL) {
436 pthread_mutex_destroy(&session_list_ptr->lock);
437
438 /* Cleanup ALL session */
54d01ffb
DG
439 cds_list_for_each_entry_safe(sess, stmp,
440 &session_list_ptr->head, list) {
2f77fc4b 441 cmd_destroy_session(sess, kernel_poll_pipe[1]);
273ea72c
DG
442 }
443 }
444
099e26bd 445 DBG("Closing all UST sockets");
56fff090 446 ust_app_clean_list();
7972aab2 447 buffer_reg_destroy_registries();
099e26bd 448
4fba7219
DG
449 if (is_root && !opt_no_kernel) {
450 DBG2("Closing kernel fd");
a4b35e07 451 if (kernel_tracer_fd >= 0) {
76d7553f
MD
452 ret = close(kernel_tracer_fd);
453 if (ret) {
454 PERROR("close");
455 }
a4b35e07 456 }
2f50c8a3 457 DBG("Unloading kernel modules");
096102bd 458 modprobe_remove_lttng_all();
2f50c8a3 459 }
2f77fc4b 460
421cb601 461 /* <fun> */
f56a39af 462 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
463 "Matthew, BEET driven development works!%c[%dm",
464 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
465 /* </fun> */
fac6795d
DG
466}
467
e065084a 468/*
d063d709 469 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 470 *
d063d709 471 * Return lttcomm error code.
e065084a
DG
472 */
473static int send_unix_sock(int sock, void *buf, size_t len)
474{
475 /* Check valid length */
c617c0c6 476 if (len == 0) {
e065084a
DG
477 return -1;
478 }
479
480 return lttcomm_send_unix_sock(sock, buf, len);
481}
482
5461b305 483/*
d063d709 484 * Free memory of a command context structure.
5461b305 485 */
a2fb29a5 486static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 487{
a2fb29a5
DG
488 DBG("Clean command context structure");
489 if (*cmd_ctx) {
490 if ((*cmd_ctx)->llm) {
491 free((*cmd_ctx)->llm);
5461b305 492 }
a2fb29a5
DG
493 if ((*cmd_ctx)->lsm) {
494 free((*cmd_ctx)->lsm);
5461b305 495 }
a2fb29a5
DG
496 free(*cmd_ctx);
497 *cmd_ctx = NULL;
5461b305
DG
498 }
499}
500
fac6795d 501/*
0fdd1e2c 502 * Notify UST applications using the shm mmap futex.
fac6795d 503 */
0fdd1e2c 504static int notify_ust_apps(int active)
fac6795d 505{
0fdd1e2c 506 char *wait_shm_mmap;
fac6795d 507
0fdd1e2c 508 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 509
0fdd1e2c
DG
510 /* See shm.c for this call implying mmap, shm and futex calls */
511 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
512 if (wait_shm_mmap == NULL) {
fac6795d
DG
513 goto error;
514 }
515
0fdd1e2c
DG
516 /* Wake waiting process */
517 futex_wait_update((int32_t *) wait_shm_mmap, active);
518
519 /* Apps notified successfully */
520 return 0;
fac6795d
DG
521
522error:
0fdd1e2c 523 return -1;
fac6795d
DG
524}
525
e065084a 526/*
d063d709
DG
527 * Setup the outgoing data buffer for the response (llm) by allocating the
528 * right amount of memory and copying the original information from the lsm
529 * structure.
ca95a216 530 *
d063d709 531 * Return total size of the buffer pointed by buf.
ca95a216 532 */
5461b305 533static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 534{
f3ed775e 535 int ret, buf_size;
ca95a216 536
f3ed775e 537 buf_size = size;
5461b305 538
ba7f0ae5 539 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 540 if (cmd_ctx->llm == NULL) {
76d7553f 541 PERROR("zmalloc");
5461b305 542 ret = -ENOMEM;
ca95a216
DG
543 goto error;
544 }
545
5461b305
DG
546 /* Copy common data */
547 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 548 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 549
5461b305
DG
550 cmd_ctx->llm->data_size = size;
551 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
552
ca95a216
DG
553 return buf_size;
554
555error:
556 return ret;
557}
558
7a485870 559/*
5eb91c98 560 * Update the kernel poll set of all channel fd available over all tracing
d063d709 561 * session. Add the wakeup pipe at the end of the set.
7a485870 562 */
5eb91c98 563static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 564{
5eb91c98 565 int ret;
7a485870
DG
566 struct ltt_session *session;
567 struct ltt_kernel_channel *channel;
568
5eb91c98 569 DBG("Updating kernel poll set");
7a485870 570
54d01ffb 571 session_lock_list();
b5541356 572 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 573 session_lock(session);
7a485870 574 if (session->kernel_session == NULL) {
54d01ffb 575 session_unlock(session);
7a485870
DG
576 continue;
577 }
7a485870 578
54d01ffb
DG
579 cds_list_for_each_entry(channel,
580 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
581 /* Add channel fd to the kernel poll set */
582 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
583 if (ret < 0) {
54d01ffb 584 session_unlock(session);
5eb91c98
DG
585 goto error;
586 }
587 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 588 }
54d01ffb 589 session_unlock(session);
7a485870 590 }
54d01ffb 591 session_unlock_list();
7a485870 592
5eb91c98 593 return 0;
7a485870
DG
594
595error:
54d01ffb 596 session_unlock_list();
7a485870
DG
597 return -1;
598}
599
600/*
54d01ffb 601 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 602 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 603 *
d063d709 604 * Useful for CPU hotplug feature.
7a485870 605 */
2bdd86d4 606static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
607{
608 int ret = 0;
609 struct ltt_session *session;
173af62f 610 struct ltt_kernel_session *ksess;
7a485870
DG
611 struct ltt_kernel_channel *channel;
612
613 DBG("Updating kernel streams for channel fd %d", fd);
614
54d01ffb 615 session_lock_list();
b5541356 616 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 617 session_lock(session);
7a485870 618 if (session->kernel_session == NULL) {
54d01ffb 619 session_unlock(session);
7a485870
DG
620 continue;
621 }
173af62f 622 ksess = session->kernel_session;
d9800920 623
173af62f 624 cds_list_for_each_entry(channel, &ksess->channel_list.head, list) {
7a485870
DG
625 if (channel->fd == fd) {
626 DBG("Channel found, updating kernel streams");
627 ret = kernel_open_channel_stream(channel);
628 if (ret < 0) {
b3c750d2 629 goto error;
7a485870 630 }
d9800920 631
7a485870 632 /*
5eb91c98
DG
633 * Have we already sent fds to the consumer? If yes, it means
634 * that tracing is started so it is safe to send our updated
635 * stream fds.
7a485870 636 */
173af62f
DG
637 if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) {
638 struct lttng_ht_iter iter;
639 struct consumer_socket *socket;
640
e7fe706f 641 rcu_read_lock();
173af62f
DG
642 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
643 &iter.iter, socket, node.node) {
644 /* Code flow error */
645 assert(socket->fd >= 0);
646
647 pthread_mutex_lock(socket->lock);
f50f23d9 648 ret = kernel_consumer_send_channel_stream(socket,
173af62f
DG
649 channel, ksess);
650 pthread_mutex_unlock(socket->lock);
651 if (ret < 0) {
e7fe706f 652 rcu_read_unlock();
173af62f
DG
653 goto error;
654 }
7a485870 655 }
e7fe706f 656 rcu_read_unlock();
7a485870 657 }
b3c750d2 658 goto error;
7a485870
DG
659 }
660 }
54d01ffb 661 session_unlock(session);
7a485870 662 }
54d01ffb 663 session_unlock_list();
b3c750d2 664 return ret;
7a485870 665
b3c750d2 666error:
54d01ffb
DG
667 session_unlock(session);
668 session_unlock_list();
7a485870
DG
669 return ret;
670}
671
487cf67c 672/*
ffe60014
DG
673 * For each tracing session, update newly registered apps. The session list
674 * lock MUST be acquired before calling this.
487cf67c
DG
675 */
676static void update_ust_app(int app_sock)
677{
678 struct ltt_session *sess, *stmp;
679
680 /* For all tracing session(s) */
681 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 682 session_lock(sess);
421cb601
DG
683 if (sess->ust_session) {
684 ust_app_global_update(sess->ust_session, app_sock);
685 }
4ee14516 686 session_unlock(sess);
487cf67c
DG
687 }
688}
689
7a485870 690/*
d063d709 691 * This thread manage event coming from the kernel.
7a485870 692 *
d063d709
DG
693 * Features supported in this thread:
694 * -) CPU Hotplug
7a485870
DG
695 */
696static void *thread_manage_kernel(void *data)
697{
139ac872 698 int ret, i, pollfd, update_poll_flag = 1, err = -1;
5eb91c98 699 uint32_t revents, nb_fd;
7a485870 700 char tmp;
5eb91c98 701 struct lttng_poll_event events;
7a485870 702
6993eeb3 703 DBG("[thread] Thread manage kernel started");
7a485870 704
927ca06a
DG
705 health_register(HEALTH_TYPE_KERNEL);
706
d5d63bf1
DG
707 /*
708 * This first step of the while is to clean this structure which could free
6d737ce4 709 * non NULL pointers so initialize it before the loop.
d5d63bf1 710 */
6d737ce4 711 lttng_poll_init(&events);
d5d63bf1 712
6993eeb3
CB
713 if (testpoint(thread_manage_kernel)) {
714 goto error_testpoint;
715 }
8ac94142 716
840cb59c 717 health_code_update();
44a5e5eb 718
6993eeb3 719 if (testpoint(thread_manage_kernel_before_loop)) {
d21b0d71 720 goto error_testpoint;
6993eeb3
CB
721 }
722
7a485870 723 while (1) {
840cb59c 724 health_code_update();
44a5e5eb 725
7a485870 726 if (update_poll_flag == 1) {
d21b0d71
DG
727 /* Clean events object. We are about to populate it again. */
728 lttng_poll_clean(&events);
729
d0b96690 730 ret = sessiond_set_thread_pollset(&events, 2);
d21b0d71
DG
731 if (ret < 0) {
732 goto error_poll_create;
733 }
734
735 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
736 if (ret < 0) {
737 goto error;
738 }
5f822d0a 739
d21b0d71 740 /* This will add the available kernel channel if any. */
5eb91c98
DG
741 ret = update_kernel_poll(&events);
742 if (ret < 0) {
7a485870
DG
743 goto error;
744 }
745 update_poll_flag = 0;
746 }
747
d21b0d71 748 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events));
7a485870
DG
749
750 /* Poll infinite value of time */
88f2b785 751 restart:
a78af745 752 health_poll_entry();
5eb91c98 753 ret = lttng_poll_wait(&events, -1);
a78af745 754 health_poll_exit();
7a485870 755 if (ret < 0) {
88f2b785
MD
756 /*
757 * Restart interrupted system call.
758 */
759 if (errno == EINTR) {
760 goto restart;
761 }
7a485870
DG
762 goto error;
763 } else if (ret == 0) {
764 /* Should not happen since timeout is infinite */
85611738
DG
765 ERR("Return value of poll is 0 with an infinite timeout.\n"
766 "This should not have happened! Continuing...");
7a485870
DG
767 continue;
768 }
769
0d9c5d77
DG
770 nb_fd = ret;
771
5eb91c98
DG
772 for (i = 0; i < nb_fd; i++) {
773 /* Fetch once the poll data */
774 revents = LTTNG_POLL_GETEV(&events, i);
775 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 776
840cb59c 777 health_code_update();
44a5e5eb 778
5eb91c98 779 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 780 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 781 if (ret) {
139ac872
MD
782 err = 0;
783 goto exit;
5eb91c98 784 }
7a485870 785
5eb91c98
DG
786 /* Check for data on kernel pipe */
787 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
f921c78f
DG
788 do {
789 ret = read(kernel_poll_pipe[0], &tmp, 1);
790 } while (ret < 0 && errno == EINTR);
791 /*
792 * Ret value is useless here, if this pipe gets any actions an
793 * update is required anyway.
794 */
5eb91c98
DG
795 update_poll_flag = 1;
796 continue;
797 } else {
798 /*
799 * New CPU detected by the kernel. Adding kernel stream to
800 * kernel session and updating the kernel consumer
801 */
802 if (revents & LPOLLIN) {
2bdd86d4 803 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
804 if (ret < 0) {
805 continue;
806 }
807 break;
808 /*
809 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
810 * and unregister kernel stream at this point.
811 */
7a485870 812 }
7a485870
DG
813 }
814 }
815 }
816
139ac872 817exit:
7a485870 818error:
5eb91c98 819 lttng_poll_clean(&events);
76d7553f 820error_poll_create:
6993eeb3 821error_testpoint:
6620da75
DG
822 utils_close_pipe(kernel_poll_pipe);
823 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
139ac872 824 if (err) {
840cb59c 825 health_error();
139ac872 826 ERR("Health error occurred in %s", __func__);
6620da75
DG
827 WARN("Kernel thread died unexpectedly. "
828 "Kernel tracing can continue but CPU hotplug is disabled.");
139ac872 829 }
927ca06a 830 health_unregister();
76d7553f 831 DBG("Kernel thread dying");
7a485870
DG
832 return NULL;
833}
834
a23ec3a7
DG
835/*
836 * Signal pthread condition of the consumer data that the thread.
837 */
838static void signal_consumer_condition(struct consumer_data *data, int state)
839{
840 pthread_mutex_lock(&data->cond_mutex);
841
842 /*
843 * The state is set before signaling. It can be any value, it's the waiter
844 * job to correctly interpret this condition variable associated to the
845 * consumer pthread_cond.
846 *
847 * A value of 0 means that the corresponding thread of the consumer data
848 * was not started. 1 indicates that the thread has started and is ready
849 * for action. A negative value means that there was an error during the
850 * thread bootstrap.
851 */
852 data->consumer_thread_is_ready = state;
853 (void) pthread_cond_signal(&data->cond);
854
855 pthread_mutex_unlock(&data->cond_mutex);
856}
857
1d4b027a 858/*
3bd1e081 859 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 860 */
3bd1e081 861static void *thread_manage_consumer(void *data)
1d4b027a 862{
139ac872 863 int sock = -1, i, ret, pollfd, err = -1;
5eb91c98 864 uint32_t revents, nb_fd;
1d4b027a 865 enum lttcomm_return_code code;
5eb91c98 866 struct lttng_poll_event events;
3bd1e081 867 struct consumer_data *consumer_data = data;
1d4b027a 868
3bd1e081 869 DBG("[thread] Manage consumer started");
1d4b027a 870
927ca06a
DG
871 health_register(HEALTH_TYPE_CONSUMER);
872
855060f8 873 health_code_update();
9449cc75 874
5eb91c98 875 /*
331744e3
JD
876 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
877 * metadata_sock. Nothing more will be added to this poll set.
5eb91c98 878 */
331744e3 879 ret = sessiond_set_thread_pollset(&events, 3);
5eb91c98 880 if (ret < 0) {
76d7553f 881 goto error_poll;
5eb91c98 882 }
273ea72c 883
edb8b045
DG
884 /*
885 * The error socket here is already in a listening state which was done
886 * just before spawning this thread to avoid a race between the consumer
887 * daemon exec trying to connect and the listen() call.
888 */
3bd1e081 889 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
890 if (ret < 0) {
891 goto error;
892 }
893
840cb59c 894 health_code_update();
44a5e5eb 895
331744e3 896 /* Infinite blocking call, waiting for transmission */
88f2b785 897restart:
a78af745 898 health_poll_entry();
8ac94142 899
6993eeb3
CB
900 if (testpoint(thread_manage_consumer)) {
901 goto error;
902 }
8ac94142 903
5eb91c98 904 ret = lttng_poll_wait(&events, -1);
a78af745 905 health_poll_exit();
273ea72c 906 if (ret < 0) {
88f2b785
MD
907 /*
908 * Restart interrupted system call.
909 */
910 if (errno == EINTR) {
911 goto restart;
912 }
273ea72c
DG
913 goto error;
914 }
915
0d9c5d77
DG
916 nb_fd = ret;
917
5eb91c98
DG
918 for (i = 0; i < nb_fd; i++) {
919 /* Fetch once the poll data */
920 revents = LTTNG_POLL_GETEV(&events, i);
921 pollfd = LTTNG_POLL_GETFD(&events, i);
922
840cb59c 923 health_code_update();
44a5e5eb 924
5eb91c98 925 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 926 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 927 if (ret) {
139ac872
MD
928 err = 0;
929 goto exit;
5eb91c98
DG
930 }
931
932 /* Event on the registration socket */
3bd1e081 933 if (pollfd == consumer_data->err_sock) {
5eb91c98 934 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 935 ERR("consumer err socket poll error");
5eb91c98
DG
936 goto error;
937 }
938 }
273ea72c
DG
939 }
940
3bd1e081 941 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
942 if (sock < 0) {
943 goto error;
944 }
945
b662582b
DG
946 /*
947 * Set the CLOEXEC flag. Return code is useless because either way, the
948 * show must go on.
949 */
950 (void) utils_set_fd_cloexec(sock);
951
840cb59c 952 health_code_update();
44a5e5eb 953
3bd1e081 954 DBG2("Receiving code from consumer err_sock");
ee0b0061 955
712ea556 956 /* Getting status code from kconsumerd */
54d01ffb
DG
957 ret = lttcomm_recv_unix_sock(sock, &code,
958 sizeof(enum lttcomm_return_code));
1d4b027a
DG
959 if (ret <= 0) {
960 goto error;
961 }
962
840cb59c 963 health_code_update();
44a5e5eb 964
f73fabfd 965 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
331744e3 966 /* Connect both socket, command and metadata. */
3bd1e081
MD
967 consumer_data->cmd_sock =
968 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
331744e3
JD
969 consumer_data->metadata_sock.fd =
970 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
971 if (consumer_data->cmd_sock < 0 ||
972 consumer_data->metadata_sock.fd < 0) {
973 PERROR("consumer connect cmd socket");
a23ec3a7
DG
974 /* On error, signal condition and quit. */
975 signal_consumer_condition(consumer_data, -1);
1d4b027a
DG
976 goto error;
977 }
331744e3
JD
978 /* Create metadata socket lock. */
979 consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
980 if (consumer_data->metadata_sock.lock == NULL) {
981 PERROR("zmalloc pthread mutex");
982 ret = -1;
983 goto error;
984 }
985 pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
986
a23ec3a7 987 signal_consumer_condition(consumer_data, 1);
331744e3
JD
988 DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
989 DBG("Consumer metadata socket ready (fd: %d)",
990 consumer_data->metadata_sock.fd);
1d4b027a 991 } else {
3bd1e081 992 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
993 lttcomm_get_readable_code(-code));
994 goto error;
995 }
996
331744e3 997 /* Remove the consumerd error sock since we've established a connexion */
3bd1e081 998 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 999 if (ret < 0) {
72079cae
DG
1000 goto error;
1001 }
1002
331744e3 1003 /* Add new accepted error socket. */
5eb91c98
DG
1004 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1005 if (ret < 0) {
72079cae 1006 goto error;
5eb91c98
DG
1007 }
1008
331744e3
JD
1009 /* Add metadata socket that is successfully connected. */
1010 ret = lttng_poll_add(&events, consumer_data->metadata_sock.fd,
1011 LPOLLIN | LPOLLRDHUP);
1012 if (ret < 0) {
1013 goto error;
1014 }
1015
840cb59c 1016 health_code_update();
44a5e5eb 1017
331744e3 1018 /* Infinite blocking call, waiting for transmission */
88f2b785 1019restart_poll:
331744e3
JD
1020 while (1) {
1021 health_poll_entry();
1022 ret = lttng_poll_wait(&events, -1);
1023 health_poll_exit();
1024 if (ret < 0) {
1025 /*
1026 * Restart interrupted system call.
1027 */
1028 if (errno == EINTR) {
1029 goto restart_poll;
1030 }
1031 goto error;
88f2b785 1032 }
72079cae 1033
331744e3 1034 nb_fd = ret;
0d9c5d77 1035
331744e3
JD
1036 for (i = 0; i < nb_fd; i++) {
1037 /* Fetch once the poll data */
1038 revents = LTTNG_POLL_GETEV(&events, i);
1039 pollfd = LTTNG_POLL_GETFD(&events, i);
5eb91c98 1040
331744e3 1041 health_code_update();
44a5e5eb 1042
331744e3
JD
1043 /* Thread quit pipe has been closed. Killing thread. */
1044 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1045 if (ret) {
1046 err = 0;
1047 goto exit;
1048 }
5eb91c98 1049
331744e3
JD
1050 if (pollfd == sock) {
1051 /* Event on the consumerd socket */
1052 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1053 ERR("consumer err socket second poll error");
1054 goto error;
1055 }
1056 health_code_update();
1057 /* Wait for any kconsumerd error */
1058 ret = lttcomm_recv_unix_sock(sock, &code,
1059 sizeof(enum lttcomm_return_code));
1060 if (ret <= 0) {
1061 ERR("consumer closed the command socket");
1062 goto error;
1063 }
1064
1065 ERR("consumer return code : %s",
1066 lttcomm_get_readable_code(-code));
1067
1068 goto exit;
1069 } else if (pollfd == consumer_data->metadata_sock.fd) {
1070 /* UST metadata requests */
1071 ret = ust_consumer_metadata_request(
1072 &consumer_data->metadata_sock);
1073 if (ret < 0) {
1074 ERR("Handling metadata request");
1075 goto error;
1076 }
1077 break;
1078 } else {
1079 ERR("Unknown pollfd");
5eb91c98
DG
1080 goto error;
1081 }
1082 }
331744e3 1083 health_code_update();
5eb91c98
DG
1084 }
1085
139ac872 1086exit:
1d4b027a 1087error:
5c827ce0
DG
1088 /* Immediately set the consumerd state to stopped */
1089 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1090 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1091 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1092 consumer_data->type == LTTNG_CONSUMER32_UST) {
1093 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1094 } else {
1095 /* Code flow error... */
1096 assert(0);
1097 }
1098
76d7553f
MD
1099 if (consumer_data->err_sock >= 0) {
1100 ret = close(consumer_data->err_sock);
1101 if (ret) {
1102 PERROR("close");
1103 }
1104 }
1105 if (consumer_data->cmd_sock >= 0) {
1106 ret = close(consumer_data->cmd_sock);
1107 if (ret) {
1108 PERROR("close");
1109 }
1110 }
331744e3
JD
1111 if (consumer_data->metadata_sock.fd >= 0) {
1112 ret = close(consumer_data->metadata_sock.fd);
1113 if (ret) {
1114 PERROR("close");
1115 }
1116 }
1117 /* Cleanup metadata socket mutex. */
1118 pthread_mutex_destroy(consumer_data->metadata_sock.lock);
1119 free(consumer_data->metadata_sock.lock);
1120
76d7553f
MD
1121 if (sock >= 0) {
1122 ret = close(sock);
1123 if (ret) {
1124 PERROR("close");
1125 }
1126 }
273ea72c 1127
3bd1e081
MD
1128 unlink(consumer_data->err_unix_sock_path);
1129 unlink(consumer_data->cmd_unix_sock_path);
1130 consumer_data->pid = 0;
1d4b027a 1131
5eb91c98 1132 lttng_poll_clean(&events);
76d7553f 1133error_poll:
139ac872 1134 if (err) {
840cb59c 1135 health_error();
139ac872
MD
1136 ERR("Health error occurred in %s", __func__);
1137 }
927ca06a 1138 health_unregister();
76d7553f 1139 DBG("consumer thread cleanup completed");
0177d773 1140
5eb91c98 1141 return NULL;
099e26bd
DG
1142}
1143
099e26bd
DG
1144/*
1145 * This thread manage application communication.
1d4b027a
DG
1146 */
1147static void *thread_manage_apps(void *data)
099e26bd 1148{
139ac872 1149 int i, ret, pollfd, err = -1;
5eb91c98 1150 uint32_t revents, nb_fd;
5eb91c98 1151 struct lttng_poll_event events;
099e26bd
DG
1152
1153 DBG("[thread] Manage application started");
1154
f6a9efaa
DG
1155 rcu_register_thread();
1156 rcu_thread_online();
1157
927ca06a
DG
1158 health_register(HEALTH_TYPE_APP_MANAGE);
1159
6993eeb3
CB
1160 if (testpoint(thread_manage_apps)) {
1161 goto error_testpoint;
1162 }
1163
840cb59c 1164 health_code_update();
44a5e5eb 1165
d0b96690 1166 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 1167 if (ret < 0) {
76d7553f 1168 goto error_poll_create;
5eb91c98 1169 }
099e26bd 1170
5eb91c98
DG
1171 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1172 if (ret < 0) {
1173 goto error;
1174 }
099e26bd 1175
6993eeb3
CB
1176 if (testpoint(thread_manage_apps_before_loop)) {
1177 goto error;
1178 }
8ac94142 1179
840cb59c 1180 health_code_update();
44a5e5eb 1181
5eb91c98 1182 while (1) {
d21b0d71 1183 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events));
099e26bd
DG
1184
1185 /* Inifinite blocking call, waiting for transmission */
88f2b785 1186 restart:
a78af745 1187 health_poll_entry();
5eb91c98 1188 ret = lttng_poll_wait(&events, -1);
a78af745 1189 health_poll_exit();
099e26bd 1190 if (ret < 0) {
88f2b785
MD
1191 /*
1192 * Restart interrupted system call.
1193 */
1194 if (errno == EINTR) {
1195 goto restart;
1196 }
099e26bd
DG
1197 goto error;
1198 }
1199
0d9c5d77
DG
1200 nb_fd = ret;
1201
5eb91c98
DG
1202 for (i = 0; i < nb_fd; i++) {
1203 /* Fetch once the poll data */
1204 revents = LTTNG_POLL_GETEV(&events, i);
1205 pollfd = LTTNG_POLL_GETFD(&events, i);
1206
840cb59c 1207 health_code_update();
44a5e5eb 1208
5eb91c98 1209 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 1210 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1211 if (ret) {
139ac872
MD
1212 err = 0;
1213 goto exit;
5eb91c98 1214 }
099e26bd 1215
5eb91c98
DG
1216 /* Inspect the apps cmd pipe */
1217 if (pollfd == apps_cmd_pipe[0]) {
1218 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1219 ERR("Apps command pipe error");
0177d773 1220 goto error;
5eb91c98 1221 } else if (revents & LPOLLIN) {
d0b96690
DG
1222 int sock;
1223
5eb91c98 1224 /* Empty pipe */
f921c78f 1225 do {
d0b96690 1226 ret = read(apps_cmd_pipe[0], &sock, sizeof(sock));
f921c78f 1227 } while (ret < 0 && errno == EINTR);
d0b96690 1228 if (ret < 0 || ret < sizeof(sock)) {
76d7553f 1229 PERROR("read apps cmd pipe");
5eb91c98
DG
1230 goto error;
1231 }
099e26bd 1232
840cb59c 1233 health_code_update();
44a5e5eb 1234
ffe60014 1235 /*
d0b96690
DG
1236 * We only monitor the error events of the socket. This
1237 * thread does not handle any incoming data from UST
1238 * (POLLIN).
ffe60014 1239 */
d0b96690
DG
1240 ret = lttng_poll_add(&events, sock,
1241 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1242 if (ret < 0) {
5eb91c98 1243 goto error;
e0c7ec2b 1244 }
acc7b41b 1245
d0b96690
DG
1246 /* Set socket timeout for both receiving and ending */
1247 (void) lttcomm_setsockopt_rcv_timeout(sock,
1248 app_socket_timeout);
1249 (void) lttcomm_setsockopt_snd_timeout(sock,
1250 app_socket_timeout);
ae9e45b3 1251
d0b96690 1252 DBG("Apps with sock %d added to poll set", sock);
487cf67c 1253
840cb59c 1254 health_code_update();
44a5e5eb 1255
5eb91c98 1256 break;
0177d773 1257 }
5eb91c98
DG
1258 } else {
1259 /*
54d01ffb
DG
1260 * At this point, we know that a registered application made
1261 * the event at poll_wait.
5eb91c98
DG
1262 */
1263 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1264 /* Removing from the poll set */
1265 ret = lttng_poll_del(&events, pollfd);
1266 if (ret < 0) {
1267 goto error;
1268 }
099e26bd 1269
b9d9b220 1270 /* Socket closed on remote end. */
56fff090 1271 ust_app_unregister(pollfd);
5eb91c98
DG
1272 break;
1273 }
099e26bd 1274 }
44a5e5eb 1275
840cb59c 1276 health_code_update();
099e26bd 1277 }
099e26bd
DG
1278 }
1279
139ac872 1280exit:
099e26bd 1281error:
5eb91c98 1282 lttng_poll_clean(&events);
76d7553f 1283error_poll_create:
6993eeb3 1284error_testpoint:
6620da75
DG
1285 utils_close_pipe(apps_cmd_pipe);
1286 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1287
1288 /*
1289 * We don't clean the UST app hash table here since already registered
1290 * applications can still be controlled so let them be until the session
1291 * daemon dies or the applications stop.
1292 */
1293
139ac872 1294 if (err) {
840cb59c 1295 health_error();
139ac872
MD
1296 ERR("Health error occurred in %s", __func__);
1297 }
927ca06a 1298 health_unregister();
76d7553f 1299 DBG("Application communication apps thread cleanup complete");
f6a9efaa
DG
1300 rcu_thread_offline();
1301 rcu_unregister_thread();
099e26bd
DG
1302 return NULL;
1303}
1304
d0b96690 1305/*
d88aee68
DG
1306 * Send a socket to a thread This is called from the dispatch UST registration
1307 * thread once all sockets are set for the application.
d0b96690
DG
1308 *
1309 * On success, return 0 else a negative value being the errno message of the
1310 * write().
1311 */
d88aee68 1312static int send_socket_to_thread(int fd, int sock)
d0b96690
DG
1313{
1314 int ret;
1315
d0b96690 1316 /* Sockets MUST be set or else this should not have been called. */
d88aee68
DG
1317 assert(fd >= 0);
1318 assert(sock >= 0);
d0b96690
DG
1319
1320 do {
d88aee68 1321 ret = write(fd, &sock, sizeof(sock));
d0b96690 1322 } while (ret < 0 && errno == EINTR);
d88aee68
DG
1323 if (ret < 0 || ret != sizeof(sock)) {
1324 PERROR("write apps pipe %d", fd);
d0b96690
DG
1325 if (ret < 0) {
1326 ret = -errno;
1327 }
1328 goto error;
1329 }
1330
1331 /* All good. Don't send back the write positive ret value. */
1332 ret = 0;
1333error:
1334 return ret;
1335}
1336
099e26bd
DG
1337/*
1338 * Dispatch request from the registration threads to the application
1339 * communication thread.
1340 */
1341static void *thread_dispatch_ust_registration(void *data)
1342{
1343 int ret;
1344 struct cds_wfq_node *node;
1345 struct ust_command *ust_cmd = NULL;
d0b96690
DG
1346 struct {
1347 struct ust_app *app;
1348 struct cds_list_head head;
d88aee68 1349 } *wait_node = NULL, *tmp_wait_node;
d0b96690
DG
1350
1351 CDS_LIST_HEAD(wait_queue);
099e26bd
DG
1352
1353 DBG("[thread] Dispatch UST command started");
1354
26c9d55e 1355 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
099e26bd
DG
1356 /* Atomically prepare the queue futex */
1357 futex_nto1_prepare(&ust_cmd_queue.futex);
1358
1359 do {
d0b96690 1360 struct ust_app *app = NULL;
7972aab2 1361 ust_cmd = NULL;
d0b96690 1362
099e26bd
DG
1363 /* Dequeue command for registration */
1364 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1365 if (node == NULL) {
00a17c97 1366 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1367 /* Continue thread execution */
1368 break;
1369 }
1370
1371 ust_cmd = caa_container_of(node, struct ust_command, node);
1372
2f50c8a3
DG
1373 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1374 " gid:%d sock:%d name:%s (version %d.%d)",
1375 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1376 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1377 ust_cmd->sock, ust_cmd->reg_msg.name,
1378 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
d0b96690
DG
1379
1380 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1381 wait_node = zmalloc(sizeof(*wait_node));
1382 if (!wait_node) {
1383 PERROR("zmalloc wait_node dispatch");
020d7f60
DG
1384 ret = close(ust_cmd->sock);
1385 if (ret < 0) {
1386 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1387 }
1388 lttng_fd_put(1, LTTNG_FD_APPS);
7972aab2 1389 free(ust_cmd);
d0b96690
DG
1390 goto error;
1391 }
1392 CDS_INIT_LIST_HEAD(&wait_node->head);
1393
1394 /* Create application object if socket is CMD. */
1395 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1396 ust_cmd->sock);
1397 if (!wait_node->app) {
1398 ret = close(ust_cmd->sock);
1399 if (ret < 0) {
1400 PERROR("close ust sock dispatch %d", ust_cmd->sock);
6620da75 1401 }
d88aee68
DG
1402 lttng_fd_put(1, LTTNG_FD_APPS);
1403 free(wait_node);
7972aab2 1404 free(ust_cmd);
d0b96690
DG
1405 continue;
1406 }
1407 /*
1408 * Add application to the wait queue so we can set the notify
1409 * socket before putting this object in the global ht.
1410 */
1411 cds_list_add(&wait_node->head, &wait_queue);
1412
7972aab2 1413 free(ust_cmd);
d0b96690
DG
1414 /*
1415 * We have to continue here since we don't have the notify
1416 * socket and the application MUST be added to the hash table
1417 * only at that moment.
1418 */
1419 continue;
1420 } else {
1421 /*
1422 * Look for the application in the local wait queue and set the
1423 * notify socket if found.
1424 */
d88aee68
DG
1425 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1426 &wait_queue, head) {
d0b96690
DG
1427 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
1428 wait_node->app->notify_sock = ust_cmd->sock;
1429 cds_list_del(&wait_node->head);
1430 app = wait_node->app;
1431 free(wait_node);
1432 DBG3("UST app notify socket %d is set", ust_cmd->sock);
1433 break;
1434 }
1435 }
020d7f60
DG
1436
1437 /*
1438 * With no application at this stage the received socket is
1439 * basically useless so close it before we free the cmd data
1440 * structure for good.
1441 */
1442 if (!app) {
1443 ret = close(ust_cmd->sock);
1444 if (ret < 0) {
1445 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1446 }
1447 lttng_fd_put(1, LTTNG_FD_APPS);
1448 }
7972aab2 1449 free(ust_cmd);
d0b96690
DG
1450 }
1451
1452 if (app) {
d0b96690
DG
1453 /*
1454 * @session_lock_list
1455 *
1456 * Lock the global session list so from the register up to the
1457 * registration done message, no thread can see the application
1458 * and change its state.
1459 */
1460 session_lock_list();
1461 rcu_read_lock();
d88aee68 1462
d0b96690
DG
1463 /*
1464 * Add application to the global hash table. This needs to be
1465 * done before the update to the UST registry can locate the
1466 * application.
1467 */
1468 ust_app_add(app);
d88aee68
DG
1469
1470 /* Set app version. This call will print an error if needed. */
1471 (void) ust_app_version(app);
1472
1473 /* Send notify socket through the notify pipe. */
1474 ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
1475 app->notify_sock);
1476 if (ret < 0) {
1477 rcu_read_unlock();
1478 session_unlock_list();
1479 /* No notify thread, stop the UST tracing. */
1480 goto error;
6620da75 1481 }
d88aee68 1482
d0b96690
DG
1483 /*
1484 * Update newly registered application with the tracing
1485 * registry info already enabled information.
1486 */
1487 update_ust_app(app->sock);
d88aee68
DG
1488
1489 /*
1490 * Don't care about return value. Let the manage apps threads
1491 * handle app unregistration upon socket close.
1492 */
1493 (void) ust_app_register_done(app->sock);
1494
1495 /*
1496 * Even if the application socket has been closed, send the app
1497 * to the thread and unregistration will take place at that
1498 * place.
1499 */
1500 ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
d0b96690 1501 if (ret < 0) {
d88aee68
DG
1502 rcu_read_unlock();
1503 session_unlock_list();
1504 /* No apps. thread, stop the UST tracing. */
1505 goto error;
d0b96690 1506 }
d88aee68 1507
d0b96690
DG
1508 rcu_read_unlock();
1509 session_unlock_list();
099e26bd 1510 }
099e26bd
DG
1511 } while (node != NULL);
1512
1513 /* Futex wait on queue. Blocking call on futex() */
1514 futex_nto1_wait(&ust_cmd_queue.futex);
1515 }
1516
1517error:
d88aee68
DG
1518 /* Clean up wait queue. */
1519 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1520 &wait_queue, head) {
1521 cds_list_del(&wait_node->head);
1522 free(wait_node);
1523 }
1524
099e26bd
DG
1525 DBG("Dispatch thread dying");
1526 return NULL;
1527}
1528
1529/*
1530 * This thread manage application registration.
1531 */
1532static void *thread_registration_apps(void *data)
1d4b027a 1533{
139ac872 1534 int sock = -1, i, ret, pollfd, err = -1;
5eb91c98
DG
1535 uint32_t revents, nb_fd;
1536 struct lttng_poll_event events;
099e26bd
DG
1537 /*
1538 * Get allocated in this thread, enqueued to a global queue, dequeued and
1539 * freed in the manage apps thread.
1540 */
1541 struct ust_command *ust_cmd = NULL;
1d4b027a 1542
099e26bd 1543 DBG("[thread] Manage application registration started");
1d4b027a 1544
927ca06a
DG
1545 health_register(HEALTH_TYPE_APP_REG);
1546
6993eeb3
CB
1547 if (testpoint(thread_registration_apps)) {
1548 goto error_testpoint;
1549 }
8ac94142 1550
1d4b027a
DG
1551 ret = lttcomm_listen_unix_sock(apps_sock);
1552 if (ret < 0) {
76d7553f 1553 goto error_listen;
1d4b027a
DG
1554 }
1555
5eb91c98
DG
1556 /*
1557 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1558 * more will be added to this poll set.
1559 */
d0b96690 1560 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 1561 if (ret < 0) {
76d7553f 1562 goto error_create_poll;
5eb91c98 1563 }
273ea72c 1564
5eb91c98
DG
1565 /* Add the application registration socket */
1566 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1567 if (ret < 0) {
76d7553f 1568 goto error_poll_add;
5eb91c98 1569 }
273ea72c 1570
1d4b027a 1571 /* Notify all applications to register */
0fdd1e2c
DG
1572 ret = notify_ust_apps(1);
1573 if (ret < 0) {
1574 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1575 "Execution continues but there might be problem for already\n"
1576 "running applications that wishes to register.");
0fdd1e2c 1577 }
1d4b027a
DG
1578
1579 while (1) {
1580 DBG("Accepting application registration");
273ea72c
DG
1581
1582 /* Inifinite blocking call, waiting for transmission */
88f2b785 1583 restart:
a78af745 1584 health_poll_entry();
5eb91c98 1585 ret = lttng_poll_wait(&events, -1);
a78af745 1586 health_poll_exit();
273ea72c 1587 if (ret < 0) {
88f2b785
MD
1588 /*
1589 * Restart interrupted system call.
1590 */
1591 if (errno == EINTR) {
1592 goto restart;
1593 }
273ea72c
DG
1594 goto error;
1595 }
1596
0d9c5d77
DG
1597 nb_fd = ret;
1598
5eb91c98 1599 for (i = 0; i < nb_fd; i++) {
840cb59c 1600 health_code_update();
139ac872 1601
5eb91c98
DG
1602 /* Fetch once the poll data */
1603 revents = LTTNG_POLL_GETEV(&events, i);
1604 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1605
5eb91c98 1606 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 1607 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1608 if (ret) {
139ac872
MD
1609 err = 0;
1610 goto exit;
90014c57 1611 }
1d4b027a 1612
5eb91c98
DG
1613 /* Event on the registration socket */
1614 if (pollfd == apps_sock) {
1615 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1616 ERR("Register apps socket poll error");
1617 goto error;
1618 } else if (revents & LPOLLIN) {
1619 sock = lttcomm_accept_unix_sock(apps_sock);
1620 if (sock < 0) {
1621 goto error;
1622 }
099e26bd 1623
b662582b
DG
1624 /*
1625 * Set the CLOEXEC flag. Return code is useless because
1626 * either way, the show must go on.
1627 */
1628 (void) utils_set_fd_cloexec(sock);
1629
5eb91c98 1630 /* Create UST registration command for enqueuing */
ba7f0ae5 1631 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1632 if (ust_cmd == NULL) {
76d7553f 1633 PERROR("ust command zmalloc");
5eb91c98
DG
1634 goto error;
1635 }
1d4b027a 1636
5eb91c98
DG
1637 /*
1638 * Using message-based transmissions to ensure we don't
1639 * have to deal with partially received messages.
1640 */
4063050c
MD
1641 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1642 if (ret < 0) {
1643 ERR("Exhausted file descriptors allowed for applications.");
1644 free(ust_cmd);
1645 ret = close(sock);
1646 if (ret) {
1647 PERROR("close");
1648 }
1649 sock = -1;
1650 continue;
1651 }
d88aee68 1652
840cb59c 1653 health_code_update();
d0b96690
DG
1654 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
1655 if (ret < 0) {
5eb91c98 1656 free(ust_cmd);
d0b96690 1657 /* Close socket of the application. */
76d7553f
MD
1658 ret = close(sock);
1659 if (ret) {
1660 PERROR("close");
1661 }
4063050c 1662 lttng_fd_put(LTTNG_FD_APPS, 1);
76d7553f 1663 sock = -1;
5eb91c98
DG
1664 continue;
1665 }
840cb59c 1666 health_code_update();
099e26bd 1667
5eb91c98 1668 ust_cmd->sock = sock;
34a2494f 1669 sock = -1;
099e26bd 1670
5eb91c98
DG
1671 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1672 " gid:%d sock:%d name:%s (version %d.%d)",
1673 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1674 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1675 ust_cmd->sock, ust_cmd->reg_msg.name,
1676 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1677
5eb91c98
DG
1678 /*
1679 * Lock free enqueue the registration request. The red pill
54d01ffb 1680 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1681 */
1682 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1683
1684 /*
1685 * Wake the registration queue futex. Implicit memory
1686 * barrier with the exchange in cds_wfq_enqueue.
1687 */
1688 futex_nto1_wake(&ust_cmd_queue.futex);
1689 }
1690 }
90014c57 1691 }
1d4b027a
DG
1692 }
1693
139ac872 1694exit:
1d4b027a 1695error:
139ac872 1696 if (err) {
840cb59c 1697 health_error();
139ac872
MD
1698 ERR("Health error occurred in %s", __func__);
1699 }
139ac872 1700
0fdd1e2c
DG
1701 /* Notify that the registration thread is gone */
1702 notify_ust_apps(0);
1703
a4b35e07 1704 if (apps_sock >= 0) {
76d7553f
MD
1705 ret = close(apps_sock);
1706 if (ret) {
1707 PERROR("close");
1708 }
a4b35e07 1709 }
46c3f085 1710 if (sock >= 0) {
76d7553f
MD
1711 ret = close(sock);
1712 if (ret) {
1713 PERROR("close");
1714 }
4063050c 1715 lttng_fd_put(LTTNG_FD_APPS, 1);
a4b35e07 1716 }
273ea72c 1717 unlink(apps_unix_sock_path);
0fdd1e2c 1718
76d7553f 1719error_poll_add:
5eb91c98 1720 lttng_poll_clean(&events);
76d7553f
MD
1721error_listen:
1722error_create_poll:
6993eeb3 1723error_testpoint:
76d7553f 1724 DBG("UST Registration thread cleanup complete");
927ca06a 1725 health_unregister();
5eb91c98 1726
1d4b027a
DG
1727 return NULL;
1728}
1729
8c0faa1d 1730/*
3bd1e081 1731 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1732 * exec or it will fails.
8c0faa1d 1733 */
3bd1e081 1734static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d 1735{
a23ec3a7 1736 int ret, clock_ret;
ee0b0061
DG
1737 struct timespec timeout;
1738
a23ec3a7
DG
1739 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1740 consumer_data->consumer_thread_is_ready = 0;
8c0faa1d 1741
a23ec3a7
DG
1742 /* Setup pthread condition */
1743 ret = pthread_condattr_init(&consumer_data->condattr);
1744 if (ret != 0) {
1745 errno = ret;
1746 PERROR("pthread_condattr_init consumer data");
1747 goto error;
1748 }
1749
1750 /*
1751 * Set the monotonic clock in order to make sure we DO NOT jump in time
1752 * between the clock_gettime() call and the timedwait call. See bug #324
1753 * for a more details and how we noticed it.
1754 */
1755 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
1756 if (ret != 0) {
1757 errno = ret;
1758 PERROR("pthread_condattr_setclock consumer data");
ee0b0061
DG
1759 goto error;
1760 }
8c0faa1d 1761
a23ec3a7
DG
1762 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
1763 if (ret != 0) {
1764 errno = ret;
1765 PERROR("pthread_cond_init consumer data");
1766 goto error;
1767 }
1768
1769 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
1770 consumer_data);
8c0faa1d 1771 if (ret != 0) {
3bd1e081 1772 PERROR("pthread_create consumer");
ee0b0061 1773 ret = -1;
8c0faa1d
DG
1774 goto error;
1775 }
1776
a23ec3a7
DG
1777 /* We are about to wait on a pthread condition */
1778 pthread_mutex_lock(&consumer_data->cond_mutex);
1779
ee0b0061 1780 /* Get time for sem_timedwait absolute timeout */
a23ec3a7
DG
1781 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
1782 /*
1783 * Set the timeout for the condition timed wait even if the clock gettime
1784 * call fails since we might loop on that call and we want to avoid to
1785 * increment the timeout too many times.
1786 */
1787 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1788
1789 /*
1790 * The following loop COULD be skipped in some conditions so this is why we
1791 * set ret to 0 in order to make sure at least one round of the loop is
1792 * done.
1793 */
1794 ret = 0;
1795
1796 /*
1797 * Loop until the condition is reached or when a timeout is reached. Note
1798 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
1799 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
1800 * possible. This loop does not take any chances and works with both of
1801 * them.
1802 */
1803 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
1804 if (clock_ret < 0) {
1805 PERROR("clock_gettime spawn consumer");
1806 /* Infinite wait for the consumerd thread to be ready */
1807 ret = pthread_cond_wait(&consumer_data->cond,
1808 &consumer_data->cond_mutex);
1809 } else {
1810 ret = pthread_cond_timedwait(&consumer_data->cond,
1811 &consumer_data->cond_mutex, &timeout);
1812 }
ee0b0061 1813 }
8c0faa1d 1814
a23ec3a7
DG
1815 /* Release the pthread condition */
1816 pthread_mutex_unlock(&consumer_data->cond_mutex);
1817
1818 if (ret != 0) {
1819 errno = ret;
1820 if (ret == ETIMEDOUT) {
ee0b0061
DG
1821 /*
1822 * Call has timed out so we kill the kconsumerd_thread and return
1823 * an error.
1824 */
a23ec3a7
DG
1825 ERR("Condition timed out. The consumer thread was never ready."
1826 " Killing it");
3bd1e081 1827 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1828 if (ret < 0) {
3bd1e081 1829 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1830 }
1831 } else {
a23ec3a7 1832 PERROR("pthread_cond_wait failed consumer thread");
ee0b0061
DG
1833 }
1834 goto error;
1835 }
1836
3bd1e081
MD
1837 pthread_mutex_lock(&consumer_data->pid_mutex);
1838 if (consumer_data->pid == 0) {
a23ec3a7 1839 ERR("Consumerd did not start");
3bd1e081 1840 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1841 goto error;
1842 }
3bd1e081 1843 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1844
8c0faa1d
DG
1845 return 0;
1846
1847error:
1848 return ret;
1849}
1850
d9800920 1851/*
3bd1e081 1852 * Join consumer thread
d9800920 1853 */
3bd1e081 1854static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1855{
1856 void *status;
cf3af59e 1857
e8209f6b
DG
1858 /* Consumer pid must be a real one. */
1859 if (consumer_data->pid > 0) {
c617c0c6 1860 int ret;
3bd1e081 1861 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1862 if (ret) {
3bd1e081 1863 ERR("Error killing consumer daemon");
cf3af59e
MD
1864 return ret;
1865 }
3bd1e081 1866 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1867 } else {
1868 return 0;
1869 }
1870}
1871
8c0faa1d 1872/*
3bd1e081 1873 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1874 *
d063d709 1875 * Return pid if successful else -1.
8c0faa1d 1876 */
3bd1e081 1877static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1878{
1879 int ret;
1880 pid_t pid;
94c55f17 1881 const char *consumer_to_use;
53086306 1882 const char *verbosity;
94c55f17 1883 struct stat st;
8c0faa1d 1884
3bd1e081 1885 DBG("Spawning consumerd");
c49dc785 1886
8c0faa1d
DG
1887 pid = fork();
1888 if (pid == 0) {
1889 /*
3bd1e081 1890 * Exec consumerd.
8c0faa1d 1891 */
daee5345 1892 if (opt_verbose_consumer) {
53086306
DG
1893 verbosity = "--verbose";
1894 } else {
1895 verbosity = "--quiet";
1896 }
3bd1e081
MD
1897 switch (consumer_data->type) {
1898 case LTTNG_CONSUMER_KERNEL:
94c55f17 1899 /*
c7704d57
DG
1900 * Find out which consumerd to execute. We will first try the
1901 * 64-bit path, then the sessiond's installation directory, and
1902 * fallback on the 32-bit one,
94c55f17 1903 */
63a799e8
AM
1904 DBG3("Looking for a kernel consumer at these locations:");
1905 DBG3(" 1) %s", consumerd64_bin);
1906 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1907 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1908 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1909 DBG3("Found location #1");
94c55f17 1910 consumer_to_use = consumerd64_bin;
94c55f17 1911 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1912 DBG3("Found location #2");
94c55f17 1913 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1914 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1915 DBG3("Found location #3");
eb1e0bd4 1916 consumer_to_use = consumerd32_bin;
94c55f17 1917 } else {
63a799e8 1918 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1919 break;
1920 }
1921 DBG("Using kernel consumer at: %s", consumer_to_use);
1922 execl(consumer_to_use,
1923 "lttng-consumerd", verbosity, "-k",
1924 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1925 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1926 NULL);
3bd1e081 1927 break;
7753dea8
MD
1928 case LTTNG_CONSUMER64_UST:
1929 {
b1e0b6b6 1930 char *tmpnew = NULL;
8f4905da
MD
1931
1932 if (consumerd64_libdir[0] != '\0') {
1933 char *tmp;
1934 size_t tmplen;
1935
1936 tmp = getenv("LD_LIBRARY_PATH");
1937 if (!tmp) {
1938 tmp = "";
1939 }
1940 tmplen = strlen("LD_LIBRARY_PATH=")
1941 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1942 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1943 if (!tmpnew) {
1944 ret = -ENOMEM;
1945 goto error;
1946 }
1947 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1948 strcat(tmpnew, consumerd64_libdir);
1949 if (tmp[0] != '\0') {
1950 strcat(tmpnew, ":");
1951 strcat(tmpnew, tmp);
1952 }
1953 ret = putenv(tmpnew);
1954 if (ret) {
1955 ret = -errno;
c6f76da9 1956 free(tmpnew);
8f4905da
MD
1957 goto error;
1958 }
1959 }
94c55f17 1960 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1961 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1962 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1963 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1964 NULL);
8f4905da
MD
1965 if (consumerd64_libdir[0] != '\0') {
1966 free(tmpnew);
1967 }
1968 if (ret) {
1969 goto error;
1970 }
3bd1e081 1971 break;
7753dea8
MD
1972 }
1973 case LTTNG_CONSUMER32_UST:
1974 {
937dde8e 1975 char *tmpnew = NULL;
8f4905da
MD
1976
1977 if (consumerd32_libdir[0] != '\0') {
1978 char *tmp;
1979 size_t tmplen;
1980
1981 tmp = getenv("LD_LIBRARY_PATH");
1982 if (!tmp) {
1983 tmp = "";
1984 }
1985 tmplen = strlen("LD_LIBRARY_PATH=")
1986 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1987 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1988 if (!tmpnew) {
1989 ret = -ENOMEM;
1990 goto error;
1991 }
1992 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1993 strcat(tmpnew, consumerd32_libdir);
1994 if (tmp[0] != '\0') {
1995 strcat(tmpnew, ":");
1996 strcat(tmpnew, tmp);
1997 }
1998 ret = putenv(tmpnew);
1999 if (ret) {
2000 ret = -errno;
c6f76da9 2001 free(tmpnew);
8f4905da
MD
2002 goto error;
2003 }
2004 }
94c55f17 2005 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 2006 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
2007 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2008 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2009 NULL);
8f4905da
MD
2010 if (consumerd32_libdir[0] != '\0') {
2011 free(tmpnew);
2012 }
2013 if (ret) {
2014 goto error;
2015 }
7753dea8
MD
2016 break;
2017 }
3bd1e081 2018 default:
76d7553f 2019 PERROR("unknown consumer type");
3bd1e081
MD
2020 exit(EXIT_FAILURE);
2021 }
8c0faa1d 2022 if (errno != 0) {
76d7553f 2023 PERROR("kernel start consumer exec");
8c0faa1d
DG
2024 }
2025 exit(EXIT_FAILURE);
2026 } else if (pid > 0) {
2027 ret = pid;
8c0faa1d 2028 } else {
76d7553f 2029 PERROR("start consumer fork");
8c0faa1d 2030 ret = -errno;
8c0faa1d 2031 }
8f4905da 2032error:
8c0faa1d
DG
2033 return ret;
2034}
2035
693bd40b 2036/*
3bd1e081 2037 * Spawn the consumerd daemon and session daemon thread.
693bd40b 2038 */
3bd1e081 2039static int start_consumerd(struct consumer_data *consumer_data)
693bd40b 2040{
c617c0c6 2041 int ret;
edb8b045
DG
2042
2043 /*
2044 * Set the listen() state on the socket since there is a possible race
2045 * between the exec() of the consumer daemon and this call if place in the
2046 * consumer thread. See bug #366 for more details.
2047 */
2048 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
2049 if (ret < 0) {
2050 goto error;
2051 }
693bd40b 2052
3bd1e081
MD
2053 pthread_mutex_lock(&consumer_data->pid_mutex);
2054 if (consumer_data->pid != 0) {
2055 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
2056 goto end;
2057 }
693bd40b 2058
3bd1e081 2059 ret = spawn_consumerd(consumer_data);
c49dc785 2060 if (ret < 0) {
3bd1e081
MD
2061 ERR("Spawning consumerd failed");
2062 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 2063 goto error;
693bd40b 2064 }
c49dc785 2065
3bd1e081
MD
2066 /* Setting up the consumer_data pid */
2067 consumer_data->pid = ret;
48842b30 2068 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 2069 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 2070
3bd1e081
MD
2071 DBG2("Spawning consumer control thread");
2072 ret = spawn_consumer_thread(consumer_data);
693bd40b 2073 if (ret < 0) {
3bd1e081 2074 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
2075 goto error;
2076 }
2077
c49dc785 2078end:
693bd40b
DG
2079 return 0;
2080
2081error:
331744e3 2082 /* Cleanup already created sockets on error. */
edb8b045 2083 if (consumer_data->err_sock >= 0) {
c617c0c6
MD
2084 int err;
2085
edb8b045
DG
2086 err = close(consumer_data->err_sock);
2087 if (err < 0) {
2088 PERROR("close consumer data error socket");
2089 }
2090 }
693bd40b
DG
2091 return ret;
2092}
2093
44a5e5eb 2094/*
139ac872
MD
2095 * Compute health status of each consumer. If one of them is zero (bad
2096 * state), we return 0.
44a5e5eb
DG
2097 */
2098static int check_consumer_health(void)
2099{
2100 int ret;
2101
927ca06a 2102 ret = health_check_state(HEALTH_TYPE_CONSUMER);
44a5e5eb
DG
2103
2104 DBG3("Health consumer check %d", ret);
2105
2106 return ret;
2107}
2108
b73401da 2109/*
096102bd 2110 * Setup necessary data for kernel tracer action.
b73401da 2111 */
096102bd 2112static int init_kernel_tracer(void)
b73401da
DG
2113{
2114 int ret;
b73401da 2115
096102bd
DG
2116 /* Modprobe lttng kernel modules */
2117 ret = modprobe_lttng_control();
b73401da 2118 if (ret < 0) {
b73401da
DG
2119 goto error;
2120 }
2121
096102bd
DG
2122 /* Open debugfs lttng */
2123 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2124 if (kernel_tracer_fd < 0) {
2125 DBG("Failed to open %s", module_proc_lttng);
2f77fc4b
DG
2126 ret = -1;
2127 goto error_open;
54d01ffb
DG
2128 }
2129
2f77fc4b
DG
2130 /* Validate kernel version */
2131 ret = kernel_validate_version(kernel_tracer_fd);
2132 if (ret < 0) {
2133 goto error_version;
b551a063 2134 }
54d01ffb 2135
2f77fc4b
DG
2136 ret = modprobe_lttng_data();
2137 if (ret < 0) {
2138 goto error_modules;
54d01ffb
DG
2139 }
2140
2f77fc4b
DG
2141 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2142 return 0;
2143
2144error_version:
2145 modprobe_remove_lttng_control();
2146 ret = close(kernel_tracer_fd);
2147 if (ret) {
2148 PERROR("close");
b551a063 2149 }
2f77fc4b 2150 kernel_tracer_fd = -1;
f73fabfd 2151 return LTTNG_ERR_KERN_VERSION;
b551a063 2152
2f77fc4b
DG
2153error_modules:
2154 ret = close(kernel_tracer_fd);
2155 if (ret) {
2156 PERROR("close");
b551a063 2157 }
54d01ffb 2158
2f77fc4b
DG
2159error_open:
2160 modprobe_remove_lttng_control();
54d01ffb
DG
2161
2162error:
2f77fc4b
DG
2163 WARN("No kernel tracer available");
2164 kernel_tracer_fd = -1;
2165 if (!is_root) {
f73fabfd 2166 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2f77fc4b 2167 } else {
f73fabfd 2168 return LTTNG_ERR_KERN_NA;
2f77fc4b 2169 }
54d01ffb
DG
2170}
2171
2f77fc4b 2172
54d01ffb 2173/*
2f77fc4b
DG
2174 * Copy consumer output from the tracing session to the domain session. The
2175 * function also applies the right modification on a per domain basis for the
2176 * trace files destination directory.
36b588ed
MD
2177 *
2178 * Should *NOT* be called with RCU read-side lock held.
54d01ffb 2179 */
2f77fc4b 2180static int copy_session_consumer(int domain, struct ltt_session *session)
54d01ffb
DG
2181{
2182 int ret;
2f77fc4b
DG
2183 const char *dir_name;
2184 struct consumer_output *consumer;
2185
2186 assert(session);
2187 assert(session->consumer);
54d01ffb 2188
b551a063
DG
2189 switch (domain) {
2190 case LTTNG_DOMAIN_KERNEL:
2f77fc4b 2191 DBG3("Copying tracing session consumer output in kernel session");
09a90bcd
DG
2192 /*
2193 * XXX: We should audit the session creation and what this function
2194 * does "extra" in order to avoid a destroy since this function is used
2195 * in the domain session creation (kernel and ust) only. Same for UST
2196 * domain.
2197 */
2198 if (session->kernel_session->consumer) {
2199 consumer_destroy_output(session->kernel_session->consumer);
2200 }
2f77fc4b
DG
2201 session->kernel_session->consumer =
2202 consumer_copy_output(session->consumer);
2203 /* Ease our life a bit for the next part */
2204 consumer = session->kernel_session->consumer;
2205 dir_name = DEFAULT_KERNEL_TRACE_DIR;
b551a063
DG
2206 break;
2207 case LTTNG_DOMAIN_UST:
2f77fc4b 2208 DBG3("Copying tracing session consumer output in UST session");
09a90bcd
DG
2209 if (session->ust_session->consumer) {
2210 consumer_destroy_output(session->ust_session->consumer);
2211 }
2f77fc4b
DG
2212 session->ust_session->consumer =
2213 consumer_copy_output(session->consumer);
2214 /* Ease our life a bit for the next part */
2215 consumer = session->ust_session->consumer;
2216 dir_name = DEFAULT_UST_TRACE_DIR;
b551a063
DG
2217 break;
2218 default:
f73fabfd 2219 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
54d01ffb
DG
2220 goto error;
2221 }
2222
2f77fc4b 2223 /* Append correct directory to subdir */
c30ce0b3
CB
2224 strncat(consumer->subdir, dir_name,
2225 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
2226 DBG3("Copy session consumer subdir %s", consumer->subdir);
2227
f73fabfd 2228 ret = LTTNG_OK;
54d01ffb
DG
2229
2230error:
2231 return ret;
2232}
2233
00e2e675 2234/*
2f77fc4b 2235 * Create an UST session and add it to the session ust list.
36b588ed
MD
2236 *
2237 * Should *NOT* be called with RCU read-side lock held.
00e2e675 2238 */
2f77fc4b
DG
2239static int create_ust_session(struct ltt_session *session,
2240 struct lttng_domain *domain)
00e2e675
DG
2241{
2242 int ret;
2f77fc4b 2243 struct ltt_ust_session *lus = NULL;
00e2e675 2244
a4b92340 2245 assert(session);
2f77fc4b
DG
2246 assert(domain);
2247 assert(session->consumer);
a4b92340 2248
2f77fc4b
DG
2249 switch (domain->type) {
2250 case LTTNG_DOMAIN_UST:
2251 break;
2252 default:
2253 ERR("Unknown UST domain on create session %d", domain->type);
f73fabfd 2254 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
00e2e675
DG
2255 goto error;
2256 }
2257
2f77fc4b
DG
2258 DBG("Creating UST session");
2259
dec56f6c 2260 lus = trace_ust_create_session(session->id);
2f77fc4b 2261 if (lus == NULL) {
f73fabfd 2262 ret = LTTNG_ERR_UST_SESS_FAIL;
a4b92340
DG
2263 goto error;
2264 }
2265
2f77fc4b
DG
2266 lus->uid = session->uid;
2267 lus->gid = session->gid;
2268 session->ust_session = lus;
00e2e675 2269
2f77fc4b
DG
2270 /* Copy session output to the newly created UST session */
2271 ret = copy_session_consumer(domain->type, session);
f73fabfd 2272 if (ret != LTTNG_OK) {
00e2e675
DG
2273 goto error;
2274 }
2275
f73fabfd 2276 return LTTNG_OK;
00e2e675
DG
2277
2278error:
2f77fc4b
DG
2279 free(lus);
2280 session->ust_session = NULL;
00e2e675
DG
2281 return ret;
2282}
2283
2284/*
2f77fc4b 2285 * Create a kernel tracer session then create the default channel.
00e2e675 2286 */
2f77fc4b 2287static int create_kernel_session(struct ltt_session *session)
00e2e675
DG
2288{
2289 int ret;
a4b92340 2290
2f77fc4b 2291 DBG("Creating kernel session");
00e2e675 2292
2f77fc4b
DG
2293 ret = kernel_create_session(session, kernel_tracer_fd);
2294 if (ret < 0) {
f73fabfd 2295 ret = LTTNG_ERR_KERN_SESS_FAIL;
00e2e675
DG
2296 goto error;
2297 }
2298
2f77fc4b
DG
2299 /* Code flow safety */
2300 assert(session->kernel_session);
2301
2302 /* Copy session output to the newly created Kernel session */
2303 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
f73fabfd 2304 if (ret != LTTNG_OK) {
a4b92340
DG
2305 goto error;
2306 }
2307
2f77fc4b
DG
2308 /* Create directory(ies) on local filesystem. */
2309 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2310 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2311 ret = run_as_mkdir_recursive(
2312 session->kernel_session->consumer->dst.trace_path,
2313 S_IRWXU | S_IRWXG, session->uid, session->gid);
2314 if (ret < 0) {
2315 if (ret != -EEXIST) {
2316 ERR("Trace directory creation error");
00e2e675
DG
2317 goto error;
2318 }
00e2e675 2319 }
2f77fc4b 2320 }
00e2e675 2321
2f77fc4b
DG
2322 session->kernel_session->uid = session->uid;
2323 session->kernel_session->gid = session->gid;
00e2e675 2324
f73fabfd 2325 return LTTNG_OK;
00e2e675 2326
2f77fc4b
DG
2327error:
2328 trace_kernel_destroy_session(session->kernel_session);
2329 session->kernel_session = NULL;
2330 return ret;
2331}
00e2e675 2332
2f77fc4b
DG
2333/*
2334 * Count number of session permitted by uid/gid.
2335 */
2336static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2337{
2338 unsigned int i = 0;
2339 struct ltt_session *session;
07424f16 2340
2f77fc4b
DG
2341 DBG("Counting number of available session for UID %d GID %d",
2342 uid, gid);
2343 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
00e2e675 2344 /*
2f77fc4b 2345 * Only list the sessions the user can control.
00e2e675 2346 */
2f77fc4b
DG
2347 if (!session_access_ok(session, uid, gid)) {
2348 continue;
2349 }
2350 i++;
a4b92340 2351 }
2f77fc4b 2352 return i;
00e2e675
DG
2353}
2354
54d01ffb
DG
2355/*
2356 * Process the command requested by the lttng client within the command
2357 * context structure. This function make sure that the return structure (llm)
2358 * is set and ready for transmission before returning.
2359 *
2360 * Return any error encountered or 0 for success.
53a80697
MD
2361 *
2362 * "sock" is only used for special-case var. len data.
36b588ed
MD
2363 *
2364 * Should *NOT* be called with RCU read-side lock held.
54d01ffb 2365 */
53a80697
MD
2366static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2367 int *sock_error)
54d01ffb 2368{
f73fabfd 2369 int ret = LTTNG_OK;
44d3bd01 2370 int need_tracing_session = 1;
2e09ba09 2371 int need_domain;
54d01ffb
DG
2372
2373 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2374
53a80697
MD
2375 *sock_error = 0;
2376
2e09ba09
MD
2377 switch (cmd_ctx->lsm->cmd_type) {
2378 case LTTNG_CREATE_SESSION:
2379 case LTTNG_DESTROY_SESSION:
2380 case LTTNG_LIST_SESSIONS:
2381 case LTTNG_LIST_DOMAINS:
2382 case LTTNG_START_TRACE:
2383 case LTTNG_STOP_TRACE:
6d805429 2384 case LTTNG_DATA_PENDING:
2e09ba09 2385 need_domain = 0;
3aace903 2386 break;
2e09ba09
MD
2387 default:
2388 need_domain = 1;
2389 }
2390
2391 if (opt_no_kernel && need_domain
2392 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
531d29f9 2393 if (!is_root) {
f73fabfd 2394 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
531d29f9 2395 } else {
f73fabfd 2396 ret = LTTNG_ERR_KERN_NA;
531d29f9 2397 }
4fba7219
DG
2398 goto error;
2399 }
2400
8d3113b2
DG
2401 /* Deny register consumer if we already have a spawned consumer. */
2402 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
2403 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2404 if (kconsumer_data.pid > 0) {
f73fabfd 2405 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
fa317f24 2406 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
8d3113b2
DG
2407 goto error;
2408 }
2409 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2410 }
2411
54d01ffb
DG
2412 /*
2413 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2414 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2415 * command.
2416 */
2417 switch(cmd_ctx->lsm->cmd_type) {
2418 case LTTNG_LIST_SESSIONS:
2419 case LTTNG_LIST_TRACEPOINTS:
f37d259d 2420 case LTTNG_LIST_TRACEPOINT_FIELDS:
54d01ffb
DG
2421 case LTTNG_LIST_DOMAINS:
2422 case LTTNG_LIST_CHANNELS:
2423 case LTTNG_LIST_EVENTS:
2424 break;
2425 default:
2426 /* Setup lttng message with no payload */
2427 ret = setup_lttng_msg(cmd_ctx, 0);
2428 if (ret < 0) {
2429 /* This label does not try to unlock the session */
2430 goto init_setup_error;
2431 }
2432 }
2433
2434 /* Commands that DO NOT need a session. */
2435 switch (cmd_ctx->lsm->cmd_type) {
54d01ffb 2436 case LTTNG_CREATE_SESSION:
2e09ba09 2437 case LTTNG_CALIBRATE:
54d01ffb
DG
2438 case LTTNG_LIST_SESSIONS:
2439 case LTTNG_LIST_TRACEPOINTS:
f37d259d 2440 case LTTNG_LIST_TRACEPOINT_FIELDS:
44d3bd01 2441 need_tracing_session = 0;
54d01ffb
DG
2442 break;
2443 default:
2444 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
256a5576
MD
2445 /*
2446 * We keep the session list lock across _all_ commands
2447 * for now, because the per-session lock does not
2448 * handle teardown properly.
2449 */
74babd95 2450 session_lock_list();
54d01ffb
DG
2451 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2452 if (cmd_ctx->session == NULL) {
2453 if (cmd_ctx->lsm->session.name != NULL) {
f73fabfd 2454 ret = LTTNG_ERR_SESS_NOT_FOUND;
54d01ffb
DG
2455 } else {
2456 /* If no session name specified */
f73fabfd 2457 ret = LTTNG_ERR_SELECT_SESS;
54d01ffb
DG
2458 }
2459 goto error;
2460 } else {
2461 /* Acquire lock for the session */
2462 session_lock(cmd_ctx->session);
2463 }
2464 break;
2465 }
b389abbe 2466
2e09ba09
MD
2467 if (!need_domain) {
2468 goto skip_domain;
2469 }
a4b92340 2470
54d01ffb
DG
2471 /*
2472 * Check domain type for specific "pre-action".
2473 */
2474 switch (cmd_ctx->lsm->domain.type) {
2475 case LTTNG_DOMAIN_KERNEL:
d1f1c568 2476 if (!is_root) {
f73fabfd 2477 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
d1f1c568
DG
2478 goto error;
2479 }
2480
54d01ffb 2481 /* Kernel tracer check */
a4b35e07 2482 if (kernel_tracer_fd == -1) {
54d01ffb 2483 /* Basically, load kernel tracer modules */
096102bd
DG
2484 ret = init_kernel_tracer();
2485 if (ret != 0) {
54d01ffb
DG
2486 goto error;
2487 }
2488 }
5eb91c98 2489
5c827ce0
DG
2490 /* Consumer is in an ERROR state. Report back to client */
2491 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
f73fabfd 2492 ret = LTTNG_ERR_NO_KERNCONSUMERD;
5c827ce0
DG
2493 goto error;
2494 }
2495
54d01ffb 2496 /* Need a session for kernel command */
44d3bd01 2497 if (need_tracing_session) {
54d01ffb 2498 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 2499 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2500 if (ret < 0) {
f73fabfd 2501 ret = LTTNG_ERR_KERN_SESS_FAIL;
5eb91c98
DG
2502 goto error;
2503 }
b389abbe 2504 }
7d29a247 2505
54d01ffb 2506 /* Start the kernel consumer daemon */
3bd1e081
MD
2507 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2508 if (kconsumer_data.pid == 0 &&
785d2d0d 2509 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
2510 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2511 ret = start_consumerd(&kconsumer_data);
7d29a247 2512 if (ret < 0) {
f73fabfd 2513 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
54d01ffb 2514 goto error;
950131af 2515 }
5c827ce0 2516 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
3ff2ecac
MD
2517 } else {
2518 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 2519 }
173af62f 2520
a4b92340
DG
2521 /*
2522 * The consumer was just spawned so we need to add the socket to
2523 * the consumer output of the session if exist.
2524 */
2525 ret = consumer_create_socket(&kconsumer_data,
2526 cmd_ctx->session->kernel_session->consumer);
2527 if (ret < 0) {
2528 goto error;
173af62f 2529 }
0d0c377a 2530 }
5c827ce0 2531
54d01ffb 2532 break;
2bdd86d4 2533 case LTTNG_DOMAIN_UST:
44d3bd01 2534 {
5c827ce0
DG
2535 /* Consumer is in an ERROR state. Report back to client */
2536 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
f73fabfd 2537 ret = LTTNG_ERR_NO_USTCONSUMERD;
5c827ce0
DG
2538 goto error;
2539 }
2540
44d3bd01 2541 if (need_tracing_session) {
a4b92340 2542 /* Create UST session if none exist. */
f6a9efaa 2543 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 2544 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 2545 &cmd_ctx->lsm->domain);
f73fabfd 2546 if (ret != LTTNG_OK) {
44d3bd01
DG
2547 goto error;
2548 }
2549 }
00e2e675 2550
7753dea8
MD
2551 /* Start the UST consumer daemons */
2552 /* 64-bit */
2553 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 2554 if (consumerd64_bin[0] != '\0' &&
7753dea8 2555 ustconsumer64_data.pid == 0 &&
785d2d0d 2556 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
2557 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2558 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 2559 if (ret < 0) {
f73fabfd 2560 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
173af62f 2561 uatomic_set(&ust_consumerd64_fd, -EINVAL);
2bdd86d4
MD
2562 goto error;
2563 }
48842b30 2564
173af62f 2565 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
5c827ce0 2566 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3ff2ecac 2567 } else {
7753dea8
MD
2568 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2569 }
173af62f
DG
2570
2571 /*
2572 * Setup socket for consumer 64 bit. No need for atomic access
2573 * since it was set above and can ONLY be set in this thread.
2574 */
a4b92340
DG
2575 ret = consumer_create_socket(&ustconsumer64_data,
2576 cmd_ctx->session->ust_session->consumer);
2577 if (ret < 0) {
2578 goto error;
173af62f
DG
2579 }
2580
7753dea8 2581 /* 32-bit */
fc7a59ce 2582 if (consumerd32_bin[0] != '\0' &&
7753dea8 2583 ustconsumer32_data.pid == 0 &&
785d2d0d 2584 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
2585 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2586 ret = start_consumerd(&ustconsumer32_data);
2587 if (ret < 0) {
f73fabfd 2588 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
173af62f 2589 uatomic_set(&ust_consumerd32_fd, -EINVAL);
7753dea8
MD
2590 goto error;
2591 }
5c827ce0 2592
173af62f 2593 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
5c827ce0 2594 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
7753dea8
MD
2595 } else {
2596 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 2597 }
173af62f
DG
2598
2599 /*
2600 * Setup socket for consumer 64 bit. No need for atomic access
2601 * since it was set above and can ONLY be set in this thread.
2602 */
a4b92340
DG
2603 ret = consumer_create_socket(&ustconsumer32_data,
2604 cmd_ctx->session->ust_session->consumer);
2605 if (ret < 0) {
2606 goto error;
173af62f 2607 }
44d3bd01
DG
2608 }
2609 break;
48842b30 2610 }
54d01ffb 2611 default:
54d01ffb
DG
2612 break;
2613 }
2e09ba09 2614skip_domain:
33a2b854 2615
5c827ce0
DG
2616 /* Validate consumer daemon state when start/stop trace command */
2617 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
2618 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
2619 switch (cmd_ctx->lsm->domain.type) {
2620 case LTTNG_DOMAIN_UST:
2621 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
f73fabfd 2622 ret = LTTNG_ERR_NO_USTCONSUMERD;
5c827ce0
DG
2623 goto error;
2624 }
2625 break;
2626 case LTTNG_DOMAIN_KERNEL:
2627 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
f73fabfd 2628 ret = LTTNG_ERR_NO_KERNCONSUMERD;
5c827ce0
DG
2629 goto error;
2630 }
2631 break;
2632 }
2633 }
2634
8e0af1b4
MD
2635 /*
2636 * Check that the UID or GID match that of the tracing session.
2637 * The root user can interact with all sessions.
2638 */
2639 if (need_tracing_session) {
2640 if (!session_access_ok(cmd_ctx->session,
730389d9
DG
2641 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2642 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
f73fabfd 2643 ret = LTTNG_ERR_EPERM;
8e0af1b4
MD
2644 goto error;
2645 }
2646 }
2647
ffe60014
DG
2648 /*
2649 * Send relayd information to consumer as soon as we have a domain and a
2650 * session defined.
2651 */
2652 if (cmd_ctx->session && need_domain) {
2653 /*
2654 * Setup relayd if not done yet. If the relayd information was already
2655 * sent to the consumer, this call will gracefully return.
2656 */
2657 ret = cmd_setup_relayd(cmd_ctx->session);
2658 if (ret != LTTNG_OK) {
2659 goto error;
2660 }
2661 }
2662
54d01ffb
DG
2663 /* Process by command type */
2664 switch (cmd_ctx->lsm->cmd_type) {
2665 case LTTNG_ADD_CONTEXT:
2666 {
2667 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2668 cmd_ctx->lsm->u.context.channel_name,
979e618e 2669 &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]);
54d01ffb
DG
2670 break;
2671 }
2672 case LTTNG_DISABLE_CHANNEL:
2673 {
2674 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2675 cmd_ctx->lsm->u.disable.channel_name);
2676 break;
2677 }
2678 case LTTNG_DISABLE_EVENT:
2679 {
2680 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2681 cmd_ctx->lsm->u.disable.channel_name,
2682 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2683 break;
2684 }
54d01ffb
DG
2685 case LTTNG_DISABLE_ALL_EVENT:
2686 {
2bdd86d4 2687 DBG("Disabling all events");
54d01ffb
DG
2688
2689 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2690 cmd_ctx->lsm->u.disable.channel_name);
2691 break;
2692 }
2693 case LTTNG_ENABLE_CHANNEL:
2694 {
7972aab2 2695 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
2f77fc4b 2696 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
54d01ffb
DG
2697 break;
2698 }
2699 case LTTNG_ENABLE_EVENT:
2700 {
7972aab2 2701 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
54d01ffb 2702 cmd_ctx->lsm->u.enable.channel_name,
025faf73 2703 &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]);
54d01ffb
DG
2704 break;
2705 }
2706 case LTTNG_ENABLE_ALL_EVENT:
2707 {
2bdd86d4 2708 DBG("Enabling all events");
54d01ffb 2709
7972aab2 2710 ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain,
8c9ae521 2711 cmd_ctx->lsm->u.enable.channel_name,
025faf73 2712 cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]);
54d01ffb
DG
2713 break;
2714 }
052da939 2715 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2716 {
9f19cc17 2717 struct lttng_event *events;
54d01ffb 2718 ssize_t nb_events;
052da939 2719
54d01ffb
DG
2720 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2721 if (nb_events < 0) {
f73fabfd 2722 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2723 ret = -nb_events;
2724 goto error;
2ef84c95
DG
2725 }
2726
2727 /*
2728 * Setup lttng message with payload size set to the event list size in
2729 * bytes and then copy list into the llm payload.
2730 */
052da939 2731 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2732 if (ret < 0) {
052da939 2733 free(events);
2ef84c95
DG
2734 goto setup_error;
2735 }
2736
2737 /* Copy event list into message payload */
9f19cc17 2738 memcpy(cmd_ctx->llm->payload, events,
052da939 2739 sizeof(struct lttng_event) * nb_events);
2ef84c95 2740
9f19cc17 2741 free(events);
2ef84c95 2742
f73fabfd 2743 ret = LTTNG_OK;
2ef84c95
DG
2744 break;
2745 }
f37d259d
MD
2746 case LTTNG_LIST_TRACEPOINT_FIELDS:
2747 {
2748 struct lttng_event_field *fields;
2749 ssize_t nb_fields;
2750
a4b92340
DG
2751 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
2752 &fields);
f37d259d 2753 if (nb_fields < 0) {
f73fabfd 2754 /* Return value is a negative lttng_error_code. */
f37d259d
MD
2755 ret = -nb_fields;
2756 goto error;
2757 }
2758
2759 /*
2760 * Setup lttng message with payload size set to the event list size in
2761 * bytes and then copy list into the llm payload.
2762 */
a4b92340
DG
2763 ret = setup_lttng_msg(cmd_ctx,
2764 sizeof(struct lttng_event_field) * nb_fields);
f37d259d
MD
2765 if (ret < 0) {
2766 free(fields);
2767 goto setup_error;
2768 }
2769
2770 /* Copy event list into message payload */
2771 memcpy(cmd_ctx->llm->payload, fields,
2772 sizeof(struct lttng_event_field) * nb_fields);
2773
2774 free(fields);
2775
f73fabfd 2776 ret = LTTNG_OK;
f37d259d
MD
2777 break;
2778 }
00e2e675
DG
2779 case LTTNG_SET_CONSUMER_URI:
2780 {
a4b92340
DG
2781 size_t nb_uri, len;
2782 struct lttng_uri *uris;
2783
2784 nb_uri = cmd_ctx->lsm->u.uri.size;
2785 len = nb_uri * sizeof(struct lttng_uri);
2786
2787 if (nb_uri == 0) {
f73fabfd 2788 ret = LTTNG_ERR_INVALID;
a4b92340
DG
2789 goto error;
2790 }
2791
2792 uris = zmalloc(len);
2793 if (uris == NULL) {
f73fabfd 2794 ret = LTTNG_ERR_FATAL;
a4b92340
DG
2795 goto error;
2796 }
2797
2798 /* Receive variable len data */
77c7c900 2799 DBG("Receiving %zu URI(s) from client ...", nb_uri);
a4b92340
DG
2800 ret = lttcomm_recv_unix_sock(sock, uris, len);
2801 if (ret <= 0) {
2802 DBG("No URIs received from client... continuing");
2803 *sock_error = 1;
f73fabfd 2804 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2805 free(uris);
a4b92340
DG
2806 goto error;
2807 }
2808
00e2e675 2809 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
a4b92340 2810 nb_uri, uris);
f73fabfd 2811 if (ret != LTTNG_OK) {
b1d41407 2812 free(uris);
a4b92340
DG
2813 goto error;
2814 }
2815
2816 /*
2817 * XXX: 0 means that this URI should be applied on the session. Should
2818 * be a DOMAIN enuam.
2819 */
2820 if (cmd_ctx->lsm->domain.type == 0) {
2821 /* Add the URI for the UST session if a consumer is present. */
2822 if (cmd_ctx->session->ust_session &&
2823 cmd_ctx->session->ust_session->consumer) {
2824 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session,
2825 nb_uri, uris);
2826 } else if (cmd_ctx->session->kernel_session &&
2827 cmd_ctx->session->kernel_session->consumer) {
2828 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL,
2829 cmd_ctx->session, nb_uri, uris);
2830 }
2831 }
2832
b1d41407
DG
2833 free(uris);
2834
00e2e675
DG
2835 break;
2836 }
f3ed775e 2837 case LTTNG_START_TRACE:
8c0faa1d 2838 {
54d01ffb 2839 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2840 break;
2841 }
f3ed775e 2842 case LTTNG_STOP_TRACE:
8c0faa1d 2843 {
54d01ffb 2844 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2845 break;
2846 }
5e16da05
MD
2847 case LTTNG_CREATE_SESSION:
2848 {
a4b92340
DG
2849 size_t nb_uri, len;
2850 struct lttng_uri *uris = NULL;
2851
2852 nb_uri = cmd_ctx->lsm->u.uri.size;
2853 len = nb_uri * sizeof(struct lttng_uri);
2854
2855 if (nb_uri > 0) {
2856 uris = zmalloc(len);
2857 if (uris == NULL) {
f73fabfd 2858 ret = LTTNG_ERR_FATAL;
a4b92340
DG
2859 goto error;
2860 }
2861
2862 /* Receive variable len data */
77c7c900 2863 DBG("Waiting for %zu URIs from client ...", nb_uri);
a4b92340
DG
2864 ret = lttcomm_recv_unix_sock(sock, uris, len);
2865 if (ret <= 0) {
2866 DBG("No URIs received from client... continuing");
2867 *sock_error = 1;
f73fabfd 2868 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2869 free(uris);
a4b92340
DG
2870 goto error;
2871 }
2872
2873 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
2874 DBG("Creating session with ONE network URI is a bad call");
f73fabfd 2875 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2876 free(uris);
a4b92340
DG
2877 goto error;
2878 }
2879 }
2880
2881 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
2882 &cmd_ctx->creds);
2883
b1d41407
DG
2884 free(uris);
2885
00e2e675
DG
2886 break;
2887 }
5e16da05
MD
2888 case LTTNG_DESTROY_SESSION:
2889 {
2f77fc4b 2890 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
a4b92340
DG
2891
2892 /* Set session to NULL so we do not unlock it after free. */
256a5576 2893 cmd_ctx->session = NULL;
5461b305 2894 break;
5e16da05 2895 }
9f19cc17 2896 case LTTNG_LIST_DOMAINS:
5e16da05 2897 {
54d01ffb
DG
2898 ssize_t nb_dom;
2899 struct lttng_domain *domains;
5461b305 2900
54d01ffb
DG
2901 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2902 if (nb_dom < 0) {
f73fabfd 2903 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2904 ret = -nb_dom;
2905 goto error;
ce3d728c 2906 }
520ff687 2907
54d01ffb 2908 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305 2909 if (ret < 0) {
ae9c20bc 2910 free(domains);
5461b305 2911 goto setup_error;
520ff687 2912 }
57167058 2913
54d01ffb
DG
2914 /* Copy event list into message payload */
2915 memcpy(cmd_ctx->llm->payload, domains,
2916 nb_dom * sizeof(struct lttng_domain));
2917
2918 free(domains);
5e16da05 2919
f73fabfd 2920 ret = LTTNG_OK;
5e16da05
MD
2921 break;
2922 }
9f19cc17 2923 case LTTNG_LIST_CHANNELS:
5e16da05 2924 {
6775595e 2925 int nb_chan;
54d01ffb
DG
2926 struct lttng_channel *channels;
2927
b551a063
DG
2928 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
2929 cmd_ctx->session, &channels);
54d01ffb 2930 if (nb_chan < 0) {
f73fabfd 2931 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2932 ret = -nb_chan;
2933 goto error;
5461b305 2934 }
ca95a216 2935
54d01ffb 2936 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305 2937 if (ret < 0) {
ae9c20bc 2938 free(channels);
5461b305
DG
2939 goto setup_error;
2940 }
9f19cc17 2941
54d01ffb
DG
2942 /* Copy event list into message payload */
2943 memcpy(cmd_ctx->llm->payload, channels,
2944 nb_chan * sizeof(struct lttng_channel));
2945
2946 free(channels);
9f19cc17 2947
f73fabfd 2948 ret = LTTNG_OK;
5461b305 2949 break;
5e16da05 2950 }
9f19cc17 2951 case LTTNG_LIST_EVENTS:
5e16da05 2952 {
b551a063 2953 ssize_t nb_event;
684d34d2 2954 struct lttng_event *events = NULL;
9f19cc17 2955
b551a063 2956 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
2957 cmd_ctx->lsm->u.list.channel_name, &events);
2958 if (nb_event < 0) {
f73fabfd 2959 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2960 ret = -nb_event;
2961 goto error;
5461b305 2962 }
ca95a216 2963
54d01ffb 2964 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305 2965 if (ret < 0) {
ae9c20bc 2966 free(events);
5461b305
DG
2967 goto setup_error;
2968 }
9f19cc17 2969
54d01ffb
DG
2970 /* Copy event list into message payload */
2971 memcpy(cmd_ctx->llm->payload, events,
2972 nb_event * sizeof(struct lttng_event));
9f19cc17 2973
54d01ffb 2974 free(events);
9f19cc17 2975
f73fabfd 2976 ret = LTTNG_OK;
5461b305 2977 break;
5e16da05
MD
2978 }
2979 case LTTNG_LIST_SESSIONS:
2980 {
8e0af1b4 2981 unsigned int nr_sessions;
5461b305 2982
8e0af1b4 2983 session_lock_list();
730389d9
DG
2984 nr_sessions = lttng_sessions_count(
2985 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2986 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
d32fb093 2987
8e0af1b4 2988 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 2989 if (ret < 0) {
54d01ffb 2990 session_unlock_list();
5461b305 2991 goto setup_error;
e065084a 2992 }
5e16da05 2993
6c9cc2ab 2994 /* Filled the session array */
2f77fc4b 2995 cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
730389d9
DG
2996 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2997 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
6c9cc2ab 2998
54d01ffb 2999 session_unlock_list();
5e16da05 3000
f73fabfd 3001 ret = LTTNG_OK;
5e16da05
MD
3002 break;
3003 }
d0254c7c
MD
3004 case LTTNG_CALIBRATE:
3005 {
54d01ffb
DG
3006 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3007 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
3008 break;
3009 }
d9800920
DG
3010 case LTTNG_REGISTER_CONSUMER:
3011 {
2f77fc4b
DG
3012 struct consumer_data *cdata;
3013
3014 switch (cmd_ctx->lsm->domain.type) {
3015 case LTTNG_DOMAIN_KERNEL:
3016 cdata = &kconsumer_data;
3017 break;
3018 default:
f73fabfd 3019 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3020 goto error;
3021 }
3022
54d01ffb 3023 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2f77fc4b 3024 cmd_ctx->lsm->u.reg.path, cdata);
d9800920
DG
3025 break;
3026 }
025faf73 3027 case LTTNG_ENABLE_EVENT_WITH_FILTER:
53a80697
MD
3028 {
3029 struct lttng_filter_bytecode *bytecode;
3030
025faf73 3031 if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) {
f73fabfd 3032 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
3033 goto error;
3034 }
52df2401
MD
3035 if (cmd_ctx->lsm->u.enable.bytecode_len == 0) {
3036 ret = LTTNG_ERR_FILTER_INVAL;
3037 goto error;
3038 }
025faf73 3039 bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len);
53a80697 3040 if (!bytecode) {
f73fabfd 3041 ret = LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
3042 goto error;
3043 }
3044 /* Receive var. len. data */
3045 DBG("Receiving var len data from client ...");
3046 ret = lttcomm_recv_unix_sock(sock, bytecode,
025faf73 3047 cmd_ctx->lsm->u.enable.bytecode_len);
53a80697
MD
3048 if (ret <= 0) {
3049 DBG("Nothing recv() from client var len data... continuing");
3050 *sock_error = 1;
f73fabfd 3051 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
3052 goto error;
3053 }
3054
3055 if (bytecode->len + sizeof(*bytecode)
025faf73 3056 != cmd_ctx->lsm->u.enable.bytecode_len) {
53a80697 3057 free(bytecode);
f73fabfd 3058 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
3059 goto error;
3060 }
3061
7972aab2 3062 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
025faf73
DG
3063 cmd_ctx->lsm->u.enable.channel_name,
3064 &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]);
53a80697
MD
3065 break;
3066 }
6d805429 3067 case LTTNG_DATA_PENDING:
806e2684 3068 {
6d805429 3069 ret = cmd_data_pending(cmd_ctx->session);
806e2684
DG
3070 break;
3071 }
5e16da05 3072 default:
f73fabfd 3073 ret = LTTNG_ERR_UND;
5461b305 3074 break;
fac6795d
DG
3075 }
3076
5461b305 3077error:
5461b305
DG
3078 if (cmd_ctx->llm == NULL) {
3079 DBG("Missing llm structure. Allocating one.");
894be886 3080 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
3081 goto setup_error;
3082 }
3083 }
54d01ffb 3084 /* Set return code */
5461b305 3085 cmd_ctx->llm->ret_code = ret;
5461b305 3086setup_error:
b5541356 3087 if (cmd_ctx->session) {
54d01ffb 3088 session_unlock(cmd_ctx->session);
b5541356 3089 }
256a5576
MD
3090 if (need_tracing_session) {
3091 session_unlock_list();
3092 }
54d01ffb 3093init_setup_error:
8028d920 3094 return ret;
fac6795d
DG
3095}
3096
44a5e5eb
DG
3097/*
3098 * Thread managing health check socket.
3099 */
3100static void *thread_manage_health(void *data)
3101{
eb4a2943 3102 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
44a5e5eb
DG
3103 uint32_t revents, nb_fd;
3104 struct lttng_poll_event events;
3105 struct lttcomm_health_msg msg;
3106 struct lttcomm_health_data reply;
3107
3108 DBG("[thread] Manage health check started");
3109
3110 rcu_register_thread();
3111
6d737ce4
DG
3112 /* We might hit an error path before this is created. */
3113 lttng_poll_init(&events);
3cc04881 3114
44a5e5eb
DG
3115 /* Create unix socket */
3116 sock = lttcomm_create_unix_sock(health_unix_sock_path);
3117 if (sock < 0) {
3118 ERR("Unable to create health check Unix socket");
3119 ret = -1;
3120 goto error;
3121 }
3122
b662582b
DG
3123 /*
3124 * Set the CLOEXEC flag. Return code is useless because either way, the
3125 * show must go on.
3126 */
3127 (void) utils_set_fd_cloexec(sock);
3128
44a5e5eb
DG
3129 ret = lttcomm_listen_unix_sock(sock);
3130 if (ret < 0) {
3131 goto error;
3132 }
3133
3134 /*
3135 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3136 * more will be added to this poll set.
3137 */
d0b96690 3138 ret = sessiond_set_thread_pollset(&events, 2);
44a5e5eb
DG
3139 if (ret < 0) {
3140 goto error;
3141 }
3142
3143 /* Add the application registration socket */
3144 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
3145 if (ret < 0) {
3146 goto error;
3147 }
3148
3149 while (1) {
3150 DBG("Health check ready");
3151
44a5e5eb
DG
3152 /* Inifinite blocking call, waiting for transmission */
3153restart:
3154 ret = lttng_poll_wait(&events, -1);
3155 if (ret < 0) {
3156 /*
3157 * Restart interrupted system call.
3158 */
3159 if (errno == EINTR) {
3160 goto restart;
3161 }
3162 goto error;
3163 }
3164
0d9c5d77
DG
3165 nb_fd = ret;
3166
44a5e5eb
DG
3167 for (i = 0; i < nb_fd; i++) {
3168 /* Fetch once the poll data */
3169 revents = LTTNG_POLL_GETEV(&events, i);
3170 pollfd = LTTNG_POLL_GETFD(&events, i);
3171
3172 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 3173 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
44a5e5eb 3174 if (ret) {
139ac872
MD
3175 err = 0;
3176 goto exit;
44a5e5eb
DG
3177 }
3178
3179 /* Event on the registration socket */
3180 if (pollfd == sock) {
3181 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3182 ERR("Health socket poll error");
3183 goto error;
3184 }
3185 }
3186 }
3187
3188 new_sock = lttcomm_accept_unix_sock(sock);
3189 if (new_sock < 0) {
3190 goto error;
3191 }
3192
b662582b
DG
3193 /*
3194 * Set the CLOEXEC flag. Return code is useless because either way, the
3195 * show must go on.
3196 */
3197 (void) utils_set_fd_cloexec(new_sock);
3198
44a5e5eb
DG
3199 DBG("Receiving data from client for health...");
3200 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
3201 if (ret <= 0) {
3202 DBG("Nothing recv() from client... continuing");
3203 ret = close(new_sock);
3204 if (ret) {
3205 PERROR("close");
3206 }
3207 new_sock = -1;
3208 continue;
3209 }
3210
3211 rcu_thread_online();
3212
3213 switch (msg.component) {
3214 case LTTNG_HEALTH_CMD:
927ca06a 3215 reply.ret_code = health_check_state(HEALTH_TYPE_CMD);
44a5e5eb 3216 break;
139ac872 3217 case LTTNG_HEALTH_APP_MANAGE:
927ca06a 3218 reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE);
139ac872 3219 break;
44a5e5eb 3220 case LTTNG_HEALTH_APP_REG:
927ca06a 3221 reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG);
44a5e5eb
DG
3222 break;
3223 case LTTNG_HEALTH_KERNEL:
927ca06a 3224 reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL);
44a5e5eb
DG
3225 break;
3226 case LTTNG_HEALTH_CONSUMER:
3227 reply.ret_code = check_consumer_health();
3228 break;
0b2dc8df
MD
3229 case LTTNG_HEALTH_HT_CLEANUP:
3230 reply.ret_code = health_check_state(HEALTH_TYPE_HT_CLEANUP);
3231 break;
44a5e5eb 3232 case LTTNG_HEALTH_ALL:
44a5e5eb 3233 reply.ret_code =
927ca06a
DG
3234 health_check_state(HEALTH_TYPE_APP_MANAGE) &&
3235 health_check_state(HEALTH_TYPE_APP_REG) &&
3236 health_check_state(HEALTH_TYPE_CMD) &&
3237 health_check_state(HEALTH_TYPE_KERNEL) &&
0b2dc8df
MD
3238 check_consumer_health() &&
3239 health_check_state(HEALTH_TYPE_HT_CLEANUP);
44a5e5eb
DG
3240 break;
3241 default:
f73fabfd 3242 reply.ret_code = LTTNG_ERR_UND;
44a5e5eb
DG
3243 break;
3244 }
3245
3246 /*
3247 * Flip ret value since 0 is a success and 1 indicates a bad health for
3248 * the client where in the sessiond it is the opposite. Again, this is
3249 * just to make things easier for us poor developer which enjoy a lot
3250 * lazyness.
3251 */
3252 if (reply.ret_code == 0 || reply.ret_code == 1) {
3253 reply.ret_code = !reply.ret_code;
3254 }
3255
3256 DBG2("Health check return value %d", reply.ret_code);
3257
3258 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
3259 if (ret < 0) {
3260 ERR("Failed to send health data back to client");
3261 }
3262
3263 /* End of transmission */
3264 ret = close(new_sock);
3265 if (ret) {
3266 PERROR("close");
3267 }
3268 new_sock = -1;
3269 }
3270
139ac872 3271exit:
44a5e5eb 3272error:
139ac872
MD
3273 if (err) {
3274 ERR("Health error occurred in %s", __func__);
3275 }
44a5e5eb
DG
3276 DBG("Health check thread dying");
3277 unlink(health_unix_sock_path);
3278 if (sock >= 0) {
3279 ret = close(sock);
3280 if (ret) {
3281 PERROR("close");
3282 }
3283 }
44a5e5eb
DG
3284
3285 lttng_poll_clean(&events);
3286
3287 rcu_unregister_thread();
3288 return NULL;
3289}
3290
1d4b027a 3291/*
d063d709
DG
3292 * This thread manage all clients request using the unix client socket for
3293 * communication.
1d4b027a
DG
3294 */
3295static void *thread_manage_clients(void *data)
3296{
139ac872 3297 int sock = -1, ret, i, pollfd, err = -1;
53a80697 3298 int sock_error;
5eb91c98 3299 uint32_t revents, nb_fd;
273ea72c 3300 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3301 struct lttng_poll_event events;
1d4b027a
DG
3302
3303 DBG("[thread] Manage client started");
3304
f6a9efaa
DG
3305 rcu_register_thread();
3306
927ca06a
DG
3307 health_register(HEALTH_TYPE_CMD);
3308
6993eeb3
CB
3309 if (testpoint(thread_manage_clients)) {
3310 goto error_testpoint;
3311 }
3312
840cb59c 3313 health_code_update();
44a5e5eb 3314
1d4b027a
DG
3315 ret = lttcomm_listen_unix_sock(client_sock);
3316 if (ret < 0) {
35df2755 3317 goto error_listen;
1d4b027a
DG
3318 }
3319
5eb91c98
DG
3320 /*
3321 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3322 * more will be added to this poll set.
3323 */
d0b96690 3324 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 3325 if (ret < 0) {
35df2755 3326 goto error_create_poll;
5eb91c98 3327 }
273ea72c 3328
5eb91c98
DG
3329 /* Add the application registration socket */
3330 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3331 if (ret < 0) {
3332 goto error;
3333 }
273ea72c 3334
bbd973c2
DG
3335 /*
3336 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
3337 */
3338 if (opt_sig_parent) {
8db8d1dc 3339 kill(ppid, SIGUSR1);
1d4b027a
DG
3340 }
3341
6993eeb3
CB
3342 if (testpoint(thread_manage_clients_before_loop)) {
3343 goto error;
3344 }
8ac94142 3345
840cb59c 3346 health_code_update();
44a5e5eb 3347
1d4b027a 3348 while (1) {
1d4b027a 3349 DBG("Accepting client command ...");
273ea72c
DG
3350
3351 /* Inifinite blocking call, waiting for transmission */
88f2b785 3352 restart:
a78af745 3353 health_poll_entry();
5eb91c98 3354 ret = lttng_poll_wait(&events, -1);
a78af745 3355 health_poll_exit();
273ea72c 3356 if (ret < 0) {
88f2b785
MD
3357 /*
3358 * Restart interrupted system call.
3359 */
3360 if (errno == EINTR) {
3361 goto restart;
3362 }
273ea72c
DG
3363 goto error;
3364 }
3365
0d9c5d77
DG
3366 nb_fd = ret;
3367
5eb91c98
DG
3368 for (i = 0; i < nb_fd; i++) {
3369 /* Fetch once the poll data */
3370 revents = LTTNG_POLL_GETEV(&events, i);
3371 pollfd = LTTNG_POLL_GETFD(&events, i);
3372
840cb59c 3373 health_code_update();
44a5e5eb 3374
5eb91c98 3375 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 3376 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 3377 if (ret) {
139ac872
MD
3378 err = 0;
3379 goto exit;
5eb91c98
DG
3380 }
3381
3382 /* Event on the registration socket */
3383 if (pollfd == client_sock) {
3384 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3385 ERR("Client socket poll error");
3386 goto error;
3387 }
3388 }
3389 }
3390
3391 DBG("Wait for client response");
3392
840cb59c 3393 health_code_update();
44a5e5eb 3394
5eb91c98
DG
3395 sock = lttcomm_accept_unix_sock(client_sock);
3396 if (sock < 0) {
273ea72c 3397 goto error;
273ea72c
DG
3398 }
3399
b662582b
DG
3400 /*
3401 * Set the CLOEXEC flag. Return code is useless because either way, the
3402 * show must go on.
3403 */
3404 (void) utils_set_fd_cloexec(sock);
3405
be040666
DG
3406 /* Set socket option for credentials retrieval */
3407 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3408 if (ret < 0) {
3409 goto error;
3410 }
3411
5eb91c98 3412 /* Allocate context command to process the client request */
ba7f0ae5 3413 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3414 if (cmd_ctx == NULL) {
76d7553f 3415 PERROR("zmalloc cmd_ctx");
1d4b027a 3416 goto error;
5eb91c98 3417 }
1d4b027a 3418
5eb91c98 3419 /* Allocate data buffer for reception */
ba7f0ae5 3420 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3421 if (cmd_ctx->lsm == NULL) {
76d7553f 3422 PERROR("zmalloc cmd_ctx->lsm");
5eb91c98
DG
3423 goto error;
3424 }
1d4b027a 3425
5eb91c98
DG
3426 cmd_ctx->llm = NULL;
3427 cmd_ctx->session = NULL;
1d4b027a 3428
840cb59c 3429 health_code_update();
44a5e5eb 3430
5eb91c98
DG
3431 /*
3432 * Data is received from the lttng client. The struct
3433 * lttcomm_session_msg (lsm) contains the command and data request of
3434 * the client.
3435 */
3436 DBG("Receiving data from client ...");
be040666
DG
3437 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3438 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG
3439 if (ret <= 0) {
3440 DBG("Nothing recv() from client... continuing");
76d7553f
MD
3441 ret = close(sock);
3442 if (ret) {
3443 PERROR("close");
3444 }
3445 sock = -1;
a2c0da86 3446 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
3447 continue;
3448 }
1d4b027a 3449
840cb59c 3450 health_code_update();
44a5e5eb 3451
5eb91c98
DG
3452 // TODO: Validate cmd_ctx including sanity check for
3453 // security purpose.
f7776ea7 3454
f6a9efaa 3455 rcu_thread_online();
5eb91c98
DG
3456 /*
3457 * This function dispatch the work to the kernel or userspace tracer
3458 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3459 * informations for the client. The command context struct contains
3460 * everything this function may needs.
3461 */
53a80697 3462 ret = process_client_msg(cmd_ctx, sock, &sock_error);
f6a9efaa 3463 rcu_thread_offline();
5eb91c98 3464 if (ret < 0) {
36134aa1
DG
3465 ret = close(sock);
3466 if (ret) {
3467 PERROR("close");
53a80697 3468 }
36134aa1 3469 sock = -1;
bbd973c2 3470 /*
5eb91c98 3471 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3472 * this point, ret < 0 means that a zmalloc failed
53a80697
MD
3473 * (ENOMEM). Error detected but still accept
3474 * command, unless a socket error has been
3475 * detected.
bbd973c2 3476 */
bbd973c2 3477 clean_command_ctx(&cmd_ctx);
5eb91c98
DG
3478 continue;
3479 }
d6e4fca4 3480
840cb59c 3481 health_code_update();
44a5e5eb 3482
54d01ffb
DG
3483 DBG("Sending response (size: %d, retcode: %s)",
3484 cmd_ctx->lttng_msg_size,
9a745bc7 3485 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3486 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG
3487 if (ret < 0) {
3488 ERR("Failed to send data back to client");
bbd973c2 3489 }
1d4b027a 3490
5eb91c98 3491 /* End of transmission */
76d7553f
MD
3492 ret = close(sock);
3493 if (ret) {
3494 PERROR("close");
3495 }
3496 sock = -1;
be040666
DG
3497
3498 clean_command_ctx(&cmd_ctx);
44a5e5eb 3499
840cb59c 3500 health_code_update();
273ea72c
DG
3501 }
3502
139ac872 3503exit:
5eb91c98 3504error:
35df2755
CB
3505 if (sock >= 0) {
3506 ret = close(sock);
3507 if (ret) {
3508 PERROR("close");
3509 }
139ac872 3510 }
44a5e5eb 3511
35df2755
CB
3512 lttng_poll_clean(&events);
3513 clean_command_ctx(&cmd_ctx);
3514
3515error_listen:
3516error_create_poll:
6993eeb3 3517error_testpoint:
273ea72c 3518 unlink(client_unix_sock_path);
76d7553f
MD
3519 if (client_sock >= 0) {
3520 ret = close(client_sock);
3521 if (ret) {
3522 PERROR("close");
3523 }
a4b35e07 3524 }
35df2755
CB
3525
3526 if (err) {
840cb59c 3527 health_error();
35df2755 3528 ERR("Health error occurred in %s", __func__);
a4b35e07 3529 }
273ea72c 3530
927ca06a 3531 health_unregister();
35df2755
CB
3532
3533 DBG("Client thread dying");
f6a9efaa
DG
3534
3535 rcu_unregister_thread();
1d4b027a
DG
3536 return NULL;
3537}
3538
3539
fac6795d
DG
3540/*
3541 * usage function on stderr
3542 */
3543static void usage(void)
3544{
b716ce68 3545 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
3546 fprintf(stderr, " -h, --help Display this usage.\n");
3547 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3548 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3549 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3550 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD
3551 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3552 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3553 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3554 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD
3555 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3556 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3557 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3558 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG
3559 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3560 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3561 fprintf(stderr, " -V, --version Show version number.\n");
3562 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3563 fprintf(stderr, " -q, --quiet No output at all.\n");
3564 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
35f90c40 3565 fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3bd1e081 3566 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3567 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG
3568}
3569
3570/*
3571 * daemon argument parsing
3572 */
3573static int parse_args(int argc, char **argv)
3574{
3575 int c;
3576
3577 static struct option long_options[] = {
3578 { "client-sock", 1, 0, 'c' },
3579 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD
3580 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3581 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD
3582 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3583 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD
3584 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3585 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3586 { "consumerd32-path", 1, 0, 'u' },
3587 { "consumerd32-libdir", 1, 0, 'U' },
3588 { "consumerd64-path", 1, 0, 't' },
3589 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3590 { "daemonize", 0, 0, 'd' },
5b8719f5 3591 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
3592 { "help", 0, 0, 'h' },
3593 { "group", 1, 0, 'g' },
3594 { "version", 0, 0, 'V' },
75462a81 3595 { "quiet", 0, 0, 'q' },
3f9947db 3596 { "verbose", 0, 0, 'v' },
3bd1e081 3597 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3598 { "no-kernel", 0, 0, 'N' },
35f90c40 3599 { "pidfile", 1, 0, 'p' },
fac6795d
DG
3600 { NULL, 0, 0, 0 }
3601 };
3602
3603 while (1) {
3604 int option_index = 0;
35f90c40 3605 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:",
54d01ffb 3606 long_options, &option_index);
fac6795d
DG
3607 if (c == -1) {
3608 break;
3609 }
3610
3611 switch (c) {
3612 case 0:
3613 fprintf(stderr, "option %s", long_options[option_index].name);
3614 if (optarg) {
3615 fprintf(stderr, " with arg %s\n", optarg);
3616 }
3617 break;
b716ce68 3618 case 'c':
fac6795d
DG
3619 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3620 break;
3621 case 'a':
3622 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3623 break;
3624 case 'd':
3625 opt_daemon = 1;
3626 break;
3627 case 'g':
fb09408a 3628 opt_tracing_group = optarg;
fac6795d
DG
3629 break;
3630 case 'h':
3631 usage();
3632 exit(EXIT_FAILURE);
3633 case 'V':
3634 fprintf(stdout, "%s\n", VERSION);
3635 exit(EXIT_SUCCESS);
5b8719f5
DG
3636 case 'S':
3637 opt_sig_parent = 1;
3638 break;
d6f42150 3639 case 'E':
3bd1e081 3640 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG
3641 break;
3642 case 'C':
3bd1e081
MD
3643 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3644 break;
3645 case 'F':
7753dea8 3646 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD
3647 break;
3648 case 'D':
7753dea8
MD
3649 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3650 break;
3651 case 'H':
3652 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3653 break;
3654 case 'G':
3655 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3656 break;
4fba7219
DG
3657 case 'N':
3658 opt_no_kernel = 1;
3659 break;
75462a81 3660 case 'q':
97e19046 3661 lttng_opt_quiet = 1;
75462a81 3662 break;
3f9947db 3663 case 'v':
53086306 3664 /* Verbose level can increase using multiple -v */
97e19046 3665 lttng_opt_verbose += 1;
3f9947db 3666 break;
31f73cc9 3667 case 'Z':
3bd1e081 3668 opt_verbose_consumer += 1;
31f73cc9 3669 break;
fb09408a 3670 case 'u':
fc7a59ce 3671 consumerd32_bin= optarg;
ebaeda94
MD
3672 break;
3673 case 'U':
3674 consumerd32_libdir = optarg;
7753dea8
MD
3675 break;
3676 case 't':
fc7a59ce 3677 consumerd64_bin = optarg;
ebaeda94
MD
3678 break;
3679 case 'T':
3680 consumerd64_libdir = optarg;
fb09408a 3681 break;
35f90c40
DG
3682 case 'p':
3683 opt_pidfile = optarg;
3684 break;
fac6795d
DG
3685 default:
3686 /* Unknown option or other error.
3687 * Error is printed by getopt, just return */
3688 return -1;
3689 }
3690 }
3691
3692 return 0;
3693}
3694
3695/*
d063d709 3696 * Creates the two needed socket by the daemon.
d6f42150
DG
3697 * apps_sock - The communication socket for all UST apps.
3698 * client_sock - The communication of the cli tool (lttng).
fac6795d 3699 */
cf3af59e 3700static int init_daemon_socket(void)
fac6795d
DG
3701{
3702 int ret = 0;
3703 mode_t old_umask;
3704
3705 old_umask = umask(0);
3706
3707 /* Create client tool unix socket */
d6f42150
DG
3708 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3709 if (client_sock < 0) {
3710 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
3711 ret = -1;
3712 goto end;
3713 }
3714
b662582b
DG
3715 /* Set the cloexec flag */
3716 ret = utils_set_fd_cloexec(client_sock);
3717 if (ret < 0) {
3718 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
3719 "Continuing but note that the consumer daemon will have a "
3720 "reference to this socket on exec()", client_sock);
3721 }
3722
fac6795d
DG
3723 /* File permission MUST be 660 */
3724 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3725 if (ret < 0) {
d6f42150 3726 ERR("Set file permissions failed: %s", client_unix_sock_path);
76d7553f 3727 PERROR("chmod");
fac6795d
DG
3728 goto end;
3729 }
3730
3731 /* Create the application unix socket */
d6f42150
DG
3732 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3733 if (apps_sock < 0) {
3734 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
3735 ret = -1;
3736 goto end;
3737 }
3738
b662582b
DG
3739 /* Set the cloexec flag */
3740 ret = utils_set_fd_cloexec(apps_sock);
3741 if (ret < 0) {
3742 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
3743 "Continuing but note that the consumer daemon will have a "
3744 "reference to this socket on exec()", apps_sock);
3745 }
3746
d6f42150 3747 /* File permission MUST be 666 */
54d01ffb
DG
3748 ret = chmod(apps_unix_sock_path,
3749 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3750 if (ret < 0) {
d6f42150 3751 ERR("Set file permissions failed: %s", apps_unix_sock_path);
76d7553f 3752 PERROR("chmod");
fac6795d
DG
3753 goto end;
3754 }
3755
b662582b
DG
3756 DBG3("Session daemon client socket %d and application socket %d created",
3757 client_sock, apps_sock);
3758
fac6795d
DG
3759end:
3760 umask(old_umask);
3761 return ret;
3762}
3763
3764/*
54d01ffb
DG
3765 * Check if the global socket is available, and if a daemon is answering at the
3766 * other side. If yes, error is returned.
fac6795d 3767 */
cf3af59e 3768static int check_existing_daemon(void)
fac6795d 3769{
7d8234d9 3770 /* Is there anybody out there ? */
099e26bd 3771 if (lttng_session_daemon_alive()) {
7d8234d9 3772 return -EEXIST;
099e26bd 3773 }
b09c7c76
DG
3774
3775 return 0;
fac6795d
DG
3776}
3777
fac6795d 3778/*
d063d709 3779 * Set the tracing group gid onto the client socket.
5e16da05 3780 *
d063d709 3781 * Race window between mkdir and chown is OK because we are going from more
d1613cf5 3782 * permissive (root.root) to less permissive (root.tracing).
fac6795d 3783 */
be040666 3784static int set_permissions(char *rundir)
fac6795d
DG
3785{
3786 int ret;
996b65c8 3787 gid_t gid;
fac6795d 3788
6775595e
DG
3789 ret = allowed_group();
3790 if (ret < 0) {
be040666
DG
3791 WARN("No tracing group detected");
3792 ret = 0;
fac6795d
DG
3793 goto end;
3794 }
3795
6775595e
DG
3796 gid = ret;
3797
d6f42150 3798 /* Set lttng run dir */
be040666 3799 ret = chown(rundir, 0, gid);
d6f42150 3800 if (ret < 0) {
be040666 3801 ERR("Unable to set group on %s", rundir);
76d7553f 3802 PERROR("chown");
d6f42150
DG
3803 }
3804
d1613cf5 3805 /* Ensure tracing group can search the run dir */
61076f74 3806 ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
d1613cf5
JN
3807 if (ret < 0) {
3808 ERR("Unable to set permissions on %s", rundir);
76d7553f 3809 PERROR("chmod");
d1613cf5
JN
3810 }
3811
d6f42150 3812 /* lttng client socket path */
996b65c8 3813 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3814 if (ret < 0) {
d6f42150 3815 ERR("Unable to set group on %s", client_unix_sock_path);
76d7553f 3816 PERROR("chown");
d6f42150
DG
3817 }
3818
3bd1e081
MD
3819 /* kconsumer error socket path */
3820 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 3821 if (ret < 0) {
3bd1e081 3822 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
76d7553f 3823 PERROR("chown");
3bd1e081
MD
3824 }
3825
7753dea8
MD
3826 /* 64-bit ustconsumer error socket path */
3827 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3828 if (ret < 0) {
3829 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
76d7553f 3830 PERROR("chown");
7753dea8
MD
3831 }
3832
3833 /* 32-bit ustconsumer compat32 error socket path */
3834 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 3835 if (ret < 0) {
7753dea8 3836 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
76d7553f 3837 PERROR("chown");
fac6795d
DG
3838 }
3839
d6f42150 3840 DBG("All permissions are set");
e07ae692 3841
fac6795d
DG
3842end:
3843 return ret;
3844}
3845
d6f42150 3846/*
d063d709 3847 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 3848 */
67e40797 3849static int create_lttng_rundir(const char *rundir)
d6f42150
DG
3850{
3851 int ret;
3852
67e40797
DG
3853 DBG3("Creating LTTng run directory: %s", rundir);
3854
d1613cf5 3855 ret = mkdir(rundir, S_IRWXU);
d6f42150 3856 if (ret < 0) {
b1f11e69 3857 if (errno != EEXIST) {
67e40797 3858 ERR("Unable to create %s", rundir);
b1f11e69
DG
3859 goto error;
3860 } else {
3861 ret = 0;
3862 }
d6f42150
DG
3863 }
3864
3865error:
3866 return ret;
3867}
3868
3869/*
d063d709
DG
3870 * Setup sockets and directory needed by the kconsumerd communication with the
3871 * session daemon.
d6f42150 3872 */
67e40797
DG
3873static int set_consumer_sockets(struct consumer_data *consumer_data,
3874 const char *rundir)
d6f42150
DG
3875{
3876 int ret;
67e40797 3877 char path[PATH_MAX];
d6f42150 3878
67e40797 3879 switch (consumer_data->type) {
7753dea8 3880 case LTTNG_CONSUMER_KERNEL:
60922cb0 3881 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD
3882 break;
3883 case LTTNG_CONSUMER64_UST:
60922cb0 3884 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD
3885 break;
3886 case LTTNG_CONSUMER32_UST:
60922cb0 3887 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD
3888 break;
3889 default:
3890 ERR("Consumer type unknown");
3891 ret = -EINVAL;
3892 goto error;
d6f42150
DG
3893 }
3894
67e40797
DG
3895 DBG2("Creating consumer directory: %s", path);
3896
d1613cf5 3897 ret = mkdir(path, S_IRWXU);
d6f42150 3898 if (ret < 0) {
6beb2242 3899 if (errno != EEXIST) {
f11e84c2 3900 PERROR("mkdir");
3bd1e081 3901 ERR("Failed to create %s", path);
6beb2242
DG
3902 goto error;
3903 }
f11e84c2 3904 ret = -1;
d6f42150
DG
3905 }
3906
3907 /* Create the kconsumerd error unix socket */
3bd1e081
MD
3908 consumer_data->err_sock =
3909 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
3910 if (consumer_data->err_sock < 0) {
3911 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG
3912 ret = -1;
3913 goto error;
3914 }
3915
3916 /* File permission MUST be 660 */
3bd1e081 3917 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 3918 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 3919 if (ret < 0) {
3bd1e081 3920 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 3921 PERROR("chmod");
d6f42150
DG
3922 goto error;
3923 }
3924
3925error:
3926 return ret;
3927}
3928
fac6795d 3929/*
d063d709 3930 * Signal handler for the daemon
cf3af59e 3931 *
54d01ffb
DG
3932 * Simply stop all worker threads, leaving main() return gracefully after
3933 * joining all threads and calling cleanup().
fac6795d
DG
3934 */
3935static void sighandler(int sig)
3936{
3937 switch (sig) {
cf3af59e 3938 case SIGPIPE:
af87c45a 3939 DBG("SIGPIPE caught");
cf3af59e
MD
3940 return;
3941 case SIGINT:
af87c45a 3942 DBG("SIGINT caught");
cf3af59e
MD
3943 stop_threads();
3944 break;
3945 case SIGTERM:
af87c45a 3946 DBG("SIGTERM caught");
cf3af59e
MD
3947 stop_threads();
3948 break;
3949 default:
3950 break;
fac6795d 3951 }
fac6795d
DG
3952}
3953
3954/*
d063d709 3955 * Setup signal handler for :
1d4b027a 3956 * SIGINT, SIGTERM, SIGPIPE
fac6795d 3957 */
1d4b027a 3958static int set_signal_handler(void)
fac6795d 3959{
1d4b027a
DG
3960 int ret = 0;
3961 struct sigaction sa;
3962 sigset_t sigset;
fac6795d 3963
1d4b027a 3964 if ((ret = sigemptyset(&sigset)) < 0) {
76d7553f 3965 PERROR("sigemptyset");
1d4b027a
DG
3966 return ret;
3967 }
d6f42150 3968
1d4b027a
DG
3969 sa.sa_handler = sighandler;
3970 sa.sa_mask = sigset;
3971 sa.sa_flags = 0;
3972 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
76d7553f 3973 PERROR("sigaction");
1d4b027a 3974 return ret;
d6f42150
DG
3975 }
3976
1d4b027a 3977 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
76d7553f 3978 PERROR("sigaction");
1d4b027a 3979 return ret;
d6f42150 3980 }
aaf26714 3981
1d4b027a 3982 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
76d7553f 3983 PERROR("sigaction");
1d4b027a 3984 return ret;
8c0faa1d
DG
3985 }
3986
1d4b027a
DG
3987 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3988
3989 return ret;
fac6795d
DG
3990}
3991
f3ed775e 3992/*
d063d709
DG
3993 * Set open files limit to unlimited. This daemon can open a large number of
3994 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG
3995 */
3996static void set_ulimit(void)
3997{
3998 int ret;
3999 struct rlimit lim;
4000
a88df331 4001 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG
4002 lim.rlim_cur = 65535;
4003 lim.rlim_max = 65535;
4004
4005 ret = setrlimit(RLIMIT_NOFILE, &lim);
4006 if (ret < 0) {
76d7553f 4007 PERROR("failed to set open files limit");
f3ed775e
DG
4008 }
4009}
4010
35f90c40
DG
4011/*
4012 * Write pidfile using the rundir and opt_pidfile.
4013 */
4014static void write_pidfile(void)
4015{
4016 int ret;
4017 char pidfile_path[PATH_MAX];
4018
4019 assert(rundir);
4020
4021 if (opt_pidfile) {
4022 strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path));
4023 } else {
4024 /* Build pidfile path from rundir and opt_pidfile. */
4025 ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
4026 DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir);
4027 if (ret < 0) {
4028 PERROR("snprintf pidfile path");
4029 goto error;
4030 }
4031 }
4032
4033 /*
4034 * Create pid file in rundir. Return value is of no importance. The
4035 * execution will continue even though we are not able to write the file.
4036 */
4037 (void) utils_create_pid_file(getpid(), pidfile_path);
4038
4039error:
4040 return;
4041}
4042
fac6795d
DG
4043/*
4044 * main
4045 */
4046int main(int argc, char **argv)
4047{
fac6795d
DG
4048 int ret = 0;
4049 void *status;
ae9e45b3 4050 const char *home_path, *env_app_timeout;
fac6795d 4051
335a95b7
MD
4052 init_kernel_workarounds();
4053
f6a9efaa
DG
4054 rcu_register_thread();
4055
7753dea8 4056 setup_consumerd_path();
fb09408a 4057
12744796
DG
4058 page_size = sysconf(_SC_PAGESIZE);
4059 if (page_size < 0) {
4060 PERROR("sysconf _SC_PAGESIZE");
4061 page_size = LONG_MAX;
4062 WARN("Fallback page size to %ld", page_size);
4063 }
4064
fac6795d
DG
4065 /* Parse arguments */
4066 progname = argv[0];
c617c0c6 4067 if ((ret = parse_args(argc, argv)) < 0) {
cf3af59e 4068 goto error;
fac6795d
DG
4069 }
4070
4071 /* Daemonize */
4072 if (opt_daemon) {
ceed52b5
MD
4073 int i;
4074
4075 /*
4076 * fork
4077 * child: setsid, close FD 0, 1, 2, chdir /
4078 * parent: exit (if fork is successful)
4079 */
53094c05
DG
4080 ret = daemon(0, 0);
4081 if (ret < 0) {
76d7553f 4082 PERROR("daemon");
cf3af59e 4083 goto error;
53094c05 4084 }
ceed52b5
MD
4085 /*
4086 * We are in the child. Make sure all other file
4087 * descriptors are closed, in case we are called with
4088 * more opened file descriptors than the standard ones.
4089 */
4090 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
4091 (void) close(i);
4092 }
4093 }
4094
4095 /* Create thread quit pipe */
4096 if ((ret = init_thread_quit_pipe()) < 0) {
4097 goto error;
fac6795d
DG
4098 }
4099
4100 /* Check if daemon is UID = 0 */
4101 is_root = !getuid();
4102
fac6795d 4103 if (is_root) {
990570ed 4104 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG
4105
4106 /* Create global run dir with root access */
4107 ret = create_lttng_rundir(rundir);
d6f42150 4108 if (ret < 0) {
cf3af59e 4109 goto error;
d6f42150
DG
4110 }
4111
fac6795d 4112 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
4113 snprintf(apps_unix_sock_path, PATH_MAX,
4114 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
4115 }
4116
4117 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
4118 snprintf(client_unix_sock_path, PATH_MAX,
4119 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4120 }
0fdd1e2c
DG
4121
4122 /* Set global SHM for ust */
4123 if (strlen(wait_shm_path) == 0) {
4124 snprintf(wait_shm_path, PATH_MAX,
4125 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4126 }
67e40797 4127
44a5e5eb
DG
4128 if (strlen(health_unix_sock_path) == 0) {
4129 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4130 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK);
4131 }
4132
67e40797
DG
4133 /* Setup kernel consumerd path */
4134 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 4135 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 4136 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4137 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG
4138
4139 DBG2("Kernel consumer err path: %s",
4140 kconsumer_data.err_unix_sock_path);
4141 DBG2("Kernel consumer cmd path: %s",
4142 kconsumer_data.cmd_unix_sock_path);
fac6795d 4143 } else {
b082db07
DG
4144 home_path = get_home_dir();
4145 if (home_path == NULL) {
273ea72c
DG
4146 /* TODO: Add --socket PATH option */
4147 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD
4148 ret = -EPERM;
4149 goto error;
b082db07
DG
4150 }
4151
67e40797
DG
4152 /*
4153 * Create rundir from home path. This will create something like
4154 * $HOME/.lttng
4155 */
990570ed 4156 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG
4157 if (ret < 0) {
4158 ret = -ENOMEM;
4159 goto error;
4160 }
4161
4162 ret = create_lttng_rundir(rundir);
4163 if (ret < 0) {
4164 goto error;
4165 }
4166
fac6795d 4167 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4168 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4169 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG
4170 }
4171
4172 /* Set the cli tool unix socket path */
4173 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4174 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4175 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4176 }
0fdd1e2c
DG
4177
4178 /* Set global SHM for ust */
4179 if (strlen(wait_shm_path) == 0) {
4180 snprintf(wait_shm_path, PATH_MAX,
d0b96690 4181 DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid());
0fdd1e2c 4182 }
44a5e5eb
DG
4183
4184 /* Set health check Unix path */
4185 if (strlen(health_unix_sock_path) == 0) {
4186 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4187 DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path);
4188 }
fac6795d
DG
4189 }
4190
5c827ce0
DG
4191 /* Set consumer initial state */
4192 kernel_consumerd_state = CONSUMER_STOPPED;
4193 ust_consumerd_state = CONSUMER_STOPPED;
4194
847177cd
DG
4195 DBG("Client socket path %s", client_unix_sock_path);
4196 DBG("Application socket path %s", apps_unix_sock_path);
d0b96690 4197 DBG("Application wait path %s", wait_shm_path);
67e40797
DG
4198 DBG("LTTng run directory path: %s", rundir);
4199
4200 /* 32 bits consumerd path setup */
4201 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 4202 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 4203 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4204 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG
4205
4206 DBG2("UST consumer 32 bits err path: %s",
4207 ustconsumer32_data.err_unix_sock_path);
4208 DBG2("UST consumer 32 bits cmd path: %s",
4209 ustconsumer32_data.cmd_unix_sock_path);
4210
4211 /* 64 bits consumerd path setup */
4212 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 4213 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 4214 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4215 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG
4216
4217 DBG2("UST consumer 64 bits err path: %s",
4218 ustconsumer64_data.err_unix_sock_path);
4219 DBG2("UST consumer 64 bits cmd path: %s",
4220 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4221
273ea72c 4222 /*
7d8234d9 4223 * See if daemon already exist.
fac6795d 4224 */
7d8234d9 4225 if ((ret = check_existing_daemon()) < 0) {
75462a81 4226 ERR("Already running daemon.\n");
273ea72c 4227 /*
cf3af59e
MD
4228 * We do not goto exit because we must not cleanup()
4229 * because a daemon is already running.
ab118b20 4230 */
cf3af59e 4231 goto error;
a88df331
DG
4232 }
4233
1427f9b2
DG
4234 /*
4235 * Init UST app hash table. Alloc hash table before this point since
4236 * cleanup() can get called after that point.
4237 */
4238 ust_app_ht_alloc();
4239
54d01ffb 4240 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG
4241
4242 /*
4243 * These actions must be executed as root. We do that *after* setting up
4244 * the sockets path because we MUST make the check for another daemon using
4245 * those paths *before* trying to set the kernel consumer sockets and init
4246 * kernel tracer.
4247 */
4248 if (is_root) {
67e40797 4249 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD
4250 if (ret < 0) {
4251 goto exit;
4252 }
4253
a88df331 4254 /* Setup kernel tracer */
4fba7219
DG
4255 if (!opt_no_kernel) {
4256 init_kernel_tracer();
4257 }
a88df331
DG
4258
4259 /* Set ulimit for open files */
4260 set_ulimit();
fac6795d 4261 }
4063050c
MD
4262 /* init lttng_fd tracking must be done after set_ulimit. */
4263 lttng_fd_init();
fac6795d 4264
67e40797
DG
4265 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4266 if (ret < 0) {
4267 goto exit;
4268 }
4269
4270 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4271 if (ret < 0) {
4272 goto exit;
4273 }
4274
cf3af59e
MD
4275 if ((ret = set_signal_handler()) < 0) {
4276 goto exit;
fac6795d
DG
4277 }
4278
d6f42150 4279 /* Setup the needed unix socket */
cf3af59e
MD
4280 if ((ret = init_daemon_socket()) < 0) {
4281 goto exit;
fac6795d
DG
4282 }
4283
4284 /* Set credentials to socket */
be040666 4285 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4286 goto exit;
fac6795d
DG
4287 }
4288
5b8719f5
DG
4289 /* Get parent pid if -S, --sig-parent is specified. */
4290 if (opt_sig_parent) {
4291 ppid = getppid();
4292 }
4293
7a485870 4294 /* Setup the kernel pipe for waking up the kernel thread */
6620da75
DG
4295 if (is_root && !opt_no_kernel) {
4296 if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) {
4297 goto exit;
4298 }
7a485870
DG
4299 }
4300
0b2dc8df
MD
4301 /* Setup the thread ht_cleanup communication pipe. */
4302 if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) {
4303 goto exit;
4304 }
4305
099e26bd 4306 /* Setup the thread apps communication pipe. */
ef599319 4307 if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) {
099e26bd
DG
4308 goto exit;
4309 }
4310
d0b96690
DG
4311 /* Setup the thread apps notify communication pipe. */
4312 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) {
4313 goto exit;
4314 }
4315
7972aab2
DG
4316 /* Initialize global buffer per UID and PID registry. */
4317 buffer_reg_init_uid_registry();
4318 buffer_reg_init_pid_registry();
4319
099e26bd
DG
4320 /* Init UST command queue. */
4321 cds_wfq_init(&ust_cmd_queue.queue);
4322
273ea72c 4323 /*
54d01ffb
DG
4324 * Get session list pointer. This pointer MUST NOT be free(). This list is
4325 * statically declared in session.c
273ea72c 4326 */
54d01ffb 4327 session_list_ptr = session_get_list();
b5541356 4328
5eb91c98
DG
4329 /* Set up max poll set size */
4330 lttng_poll_set_max_size();
4331
2f77fc4b 4332 cmd_init();
00e2e675 4333
ae9e45b3
DG
4334 /* Check for the application socket timeout env variable. */
4335 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
4336 if (env_app_timeout) {
4337 app_socket_timeout = atoi(env_app_timeout);
4338 } else {
4339 app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
4340 }
4341
35f90c40
DG
4342 write_pidfile();
4343
0b2dc8df
MD
4344 /* Create thread to manage the client socket */
4345 ret = pthread_create(&ht_cleanup_thread, NULL,
4346 thread_ht_cleanup, (void *) NULL);
4347 if (ret != 0) {
4348 PERROR("pthread_create ht_cleanup");
4349 goto exit_ht_cleanup;
4350 }
4351
44a5e5eb
DG
4352 /* Create thread to manage the client socket */
4353 ret = pthread_create(&health_thread, NULL,
4354 thread_manage_health, (void *) NULL);
4355 if (ret != 0) {
4356 PERROR("pthread_create health");
4357 goto exit_health;
4358 }
4359
cf3af59e 4360 /* Create thread to manage the client socket */
099e26bd
DG
4361 ret = pthread_create(&client_thread, NULL,
4362 thread_manage_clients, (void *) NULL);
cf3af59e 4363 if (ret != 0) {
76d7553f 4364 PERROR("pthread_create clients");
cf3af59e
MD
4365 goto exit_client;
4366 }
fac6795d 4367
099e26bd
DG
4368 /* Create thread to dispatch registration */
4369 ret = pthread_create(&dispatch_thread, NULL,
4370 thread_dispatch_ust_registration, (void *) NULL);
4371 if (ret != 0) {
76d7553f 4372 PERROR("pthread_create dispatch");
099e26bd
DG
4373 goto exit_dispatch;
4374 }
4375
4376 /* Create thread to manage application registration. */
4377 ret = pthread_create(&reg_apps_thread, NULL,
4378 thread_registration_apps, (void *) NULL);
4379 if (ret != 0) {
76d7553f 4380 PERROR("pthread_create registration");
099e26bd
DG
4381 goto exit_reg_apps;
4382 }
4383
cf3af59e 4384 /* Create thread to manage application socket */
54d01ffb
DG
4385 ret = pthread_create(&apps_thread, NULL,
4386 thread_manage_apps, (void *) NULL);
cf3af59e 4387 if (ret != 0) {
d0b96690
DG
4388 PERROR("pthread_create apps");
4389 goto exit_apps;
4390 }
4391
4392 /* Create thread to manage application notify socket */
4393 ret = pthread_create(&apps_notify_thread, NULL,
4394 ust_thread_manage_notify, (void *) NULL);
4395 if (ret != 0) {
76d7553f 4396 PERROR("pthread_create apps");
cf3af59e
MD
4397 goto exit_apps;
4398 }
fac6795d 4399
6620da75
DG
4400 /* Don't start this thread if kernel tracing is not requested nor root */
4401 if (is_root && !opt_no_kernel) {
4402 /* Create kernel thread to manage kernel event */
4403 ret = pthread_create(&kernel_thread, NULL,
4404 thread_manage_kernel, (void *) NULL);
4405 if (ret != 0) {
4406 PERROR("pthread_create kernel");
4407 goto exit_kernel;
4408 }
7a485870 4409
6620da75
DG
4410 ret = pthread_join(kernel_thread, &status);
4411 if (ret != 0) {
4412 PERROR("pthread_join");
4413 goto error; /* join error, exit without cleanup */
4414 }
fac6795d
DG
4415 }
4416
cf3af59e
MD
4417exit_kernel:
4418 ret = pthread_join(apps_thread, &status);
4419 if (ret != 0) {
76d7553f 4420 PERROR("pthread_join");
cf3af59e
MD
4421 goto error; /* join error, exit without cleanup */
4422 }
fac6795d 4423
cf3af59e 4424exit_apps:
099e26bd
DG
4425 ret = pthread_join(reg_apps_thread, &status);
4426 if (ret != 0) {
76d7553f 4427 PERROR("pthread_join");
099e26bd
DG
4428 goto error; /* join error, exit without cleanup */
4429 }
4430
4431exit_reg_apps:
4432 ret = pthread_join(dispatch_thread, &status);
4433 if (ret != 0) {
76d7553f 4434 PERROR("pthread_join");
099e26bd
DG
4435 goto error; /* join error, exit without cleanup */
4436 }
4437
4438exit_dispatch:
cf3af59e
MD
4439 ret = pthread_join(client_thread, &status);
4440 if (ret != 0) {
76d7553f 4441 PERROR("pthread_join");
cf3af59e
MD
4442 goto error; /* join error, exit without cleanup */
4443 }
4444
3bd1e081 4445 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4446 if (ret != 0) {
76d7553f 4447 PERROR("join_consumer");
cf3af59e
MD
4448 goto error; /* join error, exit without cleanup */
4449 }
a88df331 4450
06f525de
DG
4451 ret = join_consumer_thread(&ustconsumer32_data);
4452 if (ret != 0) {
4453 PERROR("join_consumer ust32");
4454 goto error; /* join error, exit without cleanup */
4455 }
4456
4457 ret = join_consumer_thread(&ustconsumer64_data);
4458 if (ret != 0) {
4459 PERROR("join_consumer ust64");
4460 goto error; /* join error, exit without cleanup */
4461 }
4462
cf3af59e 4463exit_client:
06f525de
DG
4464 ret = pthread_join(health_thread, &status);
4465 if (ret != 0) {
4466 PERROR("pthread_join health thread");
4467 goto error; /* join error, exit without cleanup */
4468 }
4469
44a5e5eb 4470exit_health:
0b2dc8df
MD
4471 ret = pthread_join(ht_cleanup_thread, &status);
4472 if (ret != 0) {
4473 PERROR("pthread_join ht cleanup thread");
4474 goto error; /* join error, exit without cleanup */
4475 }
4476exit_ht_cleanup:
a88df331 4477exit:
cf3af59e
MD
4478 /*
4479 * cleanup() is called when no other thread is running.
4480 */
f6a9efaa 4481 rcu_thread_online();
cf3af59e 4482 cleanup();
f6a9efaa
DG
4483 rcu_thread_offline();
4484 rcu_unregister_thread();
67e40797 4485 if (!ret) {
cf3af59e 4486 exit(EXIT_SUCCESS);
67e40797 4487 }
cf3af59e 4488error:
5e16da05 4489 exit(EXIT_FAILURE);
fac6795d 4490}
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