Fix: Wrong poll events on UST application socket
[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>
0fdd1e2c 28#include <sys/mman.h>
b73401da 29#include <sys/mount.h>
1e307fab 30#include <sys/resource.h>
fac6795d
DG
31#include <sys/socket.h>
32#include <sys/stat.h>
33#include <sys/types.h>
0fdd1e2c 34#include <sys/wait.h>
5c827ce0 35#include <urcu/uatomic.h>
fac6795d 36#include <unistd.h>
3bd1e081 37#include <config.h>
fac6795d 38
990570ed 39#include <common/common.h>
0ba98ebc 40#include <common/compat/poll.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"
54d01ffb 49#include "channel.h"
2f77fc4b 50#include "cmd.h"
00e2e675 51#include "consumer.h"
099e26bd 52#include "context.h"
54d01ffb 53#include "event.h"
4771f025 54#include "kernel.h"
f1e16794 55#include "kernel-consumer.h"
096102bd 56#include "modprobe.h"
0fdd1e2c 57#include "shm.h"
1e307fab 58#include "ust-ctl.h"
00e2e675 59#include "ust-consumer.h"
8e68d1c8 60#include "utils.h"
4063050c 61#include "fd-limit.h"
53a80697 62#include "filter.h"
44a5e5eb 63#include "health.h"
8ac94142 64#include "testpoint.h"
fac6795d 65
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MD
66#define CONSUMERD_FILE "lttng-consumerd"
67
75462a81 68/* Const values */
686204ab 69const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 70const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD
71const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
72const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
73
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74const char *progname;
75const char *opt_tracing_group;
5b8719f5 76static int opt_sig_parent;
97e19046 77static int opt_verbose_consumer;
fac6795d 78static int opt_daemon;
4fba7219 79static int opt_no_kernel;
fac6795d 80static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 81static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 82static char *rundir;
3bd1e081 83
a23ec3a7
DG
84/*
85 * Consumer daemon specific control data. Every value not initialized here is
86 * set to 0 by the static definition.
87 */
3bd1e081
MD
88static struct consumer_data kconsumer_data = {
89 .type = LTTNG_CONSUMER_KERNEL,
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90 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
91 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
03550b58
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92 .err_sock = -1,
93 .cmd_sock = -1,
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94 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
95 .lock = PTHREAD_MUTEX_INITIALIZER,
a23ec3a7
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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,
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101 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
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103 .err_sock = -1,
104 .cmd_sock = -1,
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105 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
106 .lock = PTHREAD_MUTEX_INITIALIZER,
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107 .cond = PTHREAD_COND_INITIALIZER,
108 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
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MD
109};
110static struct consumer_data ustconsumer32_data = {
111 .type = LTTNG_CONSUMER32_UST,
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112 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
113 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
03550b58
MD
114 .err_sock = -1,
115 .cmd_sock = -1,
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116 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
117 .lock = PTHREAD_MUTEX_INITIALIZER,
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118 .cond = PTHREAD_COND_INITIALIZER,
119 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
3bd1e081
MD
120};
121
26c9d55e 122/* Shared between threads */
099e26bd 123static int dispatch_thread_exit;
fac6795d 124
54d01ffb
DG
125/* Global application Unix socket path */
126static char apps_unix_sock_path[PATH_MAX];
127/* Global client Unix socket path */
128static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
129/* global wait shm path for UST */
130static char wait_shm_path[PATH_MAX];
44a5e5eb
DG
131/* Global health check unix path */
132static char health_unix_sock_path[PATH_MAX];
fac6795d 133
1d4b027a 134/* Sockets and FDs */
a4b35e07
MD
135static int client_sock = -1;
136static int apps_sock = -1;
2f77fc4b 137int kernel_tracer_fd = -1;
76d7553f 138static int kernel_poll_pipe[2] = { -1, -1 };
1d4b027a 139
273ea72c
DG
140/*
141 * Quit pipe for all threads. This permits a single cancellation point
142 * for all threads when receiving an event on the pipe.
143 */
76d7553f 144static int thread_quit_pipe[2] = { -1, -1 };
273ea72c 145
099e26bd
DG
146/*
147 * This pipe is used to inform the thread managing application communication
148 * that a command is queued and ready to be processed.
149 */
76d7553f 150static int apps_cmd_pipe[2] = { -1, -1 };
099e26bd 151
1d4b027a 152/* Pthread, Mutexes and Semaphores */
1d4b027a 153static pthread_t apps_thread;
099e26bd 154static pthread_t reg_apps_thread;
1d4b027a 155static pthread_t client_thread;
7a485870 156static pthread_t kernel_thread;
099e26bd 157static pthread_t dispatch_thread;
44a5e5eb 158static pthread_t health_thread;
5eb91c98 159
099e26bd
DG
160/*
161 * UST registration command queue. This queue is tied with a futex and uses a N
162 * wakers / 1 waiter implemented and detailed in futex.c/.h
163 *
164 * The thread_manage_apps and thread_dispatch_ust_registration interact with
165 * this queue and the wait/wake scheme.
166 */
167static struct ust_cmd_queue ust_cmd_queue;
168
b5541356
DG
169/*
170 * Pointer initialized before thread creation.
171 *
172 * This points to the tracing session list containing the session count and a
173 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
174 * MUST NOT be taken if you call a public function in session.c.
04ea676f 175 *
d063d709 176 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 177 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG
178 */
179static struct ltt_session_list *session_list_ptr;
180
7753dea8
MD
181int ust_consumerd64_fd = -1;
182int ust_consumerd32_fd = -1;
183
fb6f1fa2
YB
184static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
185static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
186static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
187static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a 188
2f77fc4b
DG
189static const char *module_proc_lttng = "/proc/lttng";
190
5c827ce0
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191/*
192 * Consumer daemon state which is changed when spawning it, killing it or in
193 * case of a fatal error.
194 */
195enum consumerd_state {
196 CONSUMER_STARTED = 1,
197 CONSUMER_STOPPED = 2,
198 CONSUMER_ERROR = 3,
199};
200
201/*
202 * This consumer daemon state is used to validate if a client command will be
203 * able to reach the consumer. If not, the client is informed. For instance,
204 * doing a "lttng start" when the consumer state is set to ERROR will return an
205 * error to the client.
206 *
207 * The following example shows a possible race condition of this scheme:
208 *
209 * consumer thread error happens
210 * client cmd arrives
211 * client cmd checks state -> still OK
212 * consumer thread exit, sets error
213 * client cmd try to talk to consumer
214 * ...
215 *
216 * However, since the consumer is a different daemon, we have no way of making
217 * sure the command will reach it safely even with this state flag. This is why
218 * we consider that up to the state validation during command processing, the
219 * command is safe. After that, we can not guarantee the correctness of the
220 * client request vis-a-vis the consumer.
221 */
222static enum consumerd_state ust_consumerd_state;
223static enum consumerd_state kernel_consumerd_state;
224
44a5e5eb
DG
225/* Used for the health monitoring of the session daemon. See health.h */
226struct health_state health_thread_cmd;
139ac872 227struct health_state health_thread_app_manage;
44a5e5eb
DG
228struct health_state health_thread_app_reg;
229struct health_state health_thread_kernel;
230
fb09408a 231static
7753dea8 232void setup_consumerd_path(void)
fb09408a 233{
fc7a59ce 234 const char *bin, *libdir;
fb09408a 235
7753dea8
MD
236 /*
237 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
238 * native architecture size consumer if CONFIG_CONSUMER*_PATH
239 * has not been defined.
7753dea8 240 */
ebaeda94 241#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
242 if (!consumerd32_bin[0]) {
243 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
244 }
245 if (!consumerd32_libdir[0]) {
246 consumerd32_libdir = INSTALL_LIB_PATH;
247 }
248#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM
249 if (!consumerd64_bin[0]) {
250 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 251 }
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252 if (!consumerd64_libdir[0]) {
253 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
254 }
255#else
256#error "Unknown bitness"
257#endif
258
fb09408a
MD
259 /*
260 * runtime env. var. overrides the build default.
261 */
fc7a59ce
AM
262 bin = getenv("LTTNG_CONSUMERD32_BIN");
263 if (bin) {
264 consumerd32_bin = bin;
7753dea8 265 }
fc7a59ce
AM
266 bin = getenv("LTTNG_CONSUMERD64_BIN");
267 if (bin) {
268 consumerd64_bin = bin;
ebaeda94 269 }
72f579ee 270 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
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MD
271 if (libdir) {
272 consumerd32_libdir = libdir;
273 }
72f579ee 274 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD
275 if (libdir) {
276 consumerd64_libdir = libdir;
fb09408a
MD
277 }
278}
279
5eb91c98
DG
280/*
281 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
282 */
283static int create_thread_poll_set(struct lttng_poll_event *events,
284 unsigned int size)
285{
286 int ret;
287
288 if (events == NULL || size == 0) {
289 ret = -1;
290 goto error;
291 }
292
293 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
294 if (ret < 0) {
295 goto error;
296 }
297
298 /* Add quit pipe */
299 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
300 if (ret < 0) {
301 goto error;
302 }
303
304 return 0;
305
306error:
307 return ret;
308}
309
310/*
311 * Check if the thread quit pipe was triggered.
312 *
313 * Return 1 if it was triggered else 0;
314 */
315static int check_thread_quit_pipe(int fd, uint32_t events)
316{
317 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
318 return 1;
319 }
320
321 return 0;
322}
323
0fdd1e2c
DG
324/*
325 * Return group ID of the tracing group or -1 if not found.
326 */
996b65c8
MD
327static gid_t allowed_group(void)
328{
329 struct group *grp;
330
274e143b
MD
331 if (opt_tracing_group) {
332 grp = getgrnam(opt_tracing_group);
333 } else {
334 grp = getgrnam(default_tracing_group);
335 }
996b65c8
MD
336 if (!grp) {
337 return -1;
338 } else {
339 return grp->gr_gid;
340 }
341}
342
273ea72c 343/*
5eb91c98 344 * Init thread quit pipe.
273ea72c
DG
345 *
346 * Return -1 on error or 0 if all pipes are created.
347 */
348static int init_thread_quit_pipe(void)
349{
730389d9 350 int ret, i;
273ea72c 351
730389d9 352 ret = pipe(thread_quit_pipe);
273ea72c 353 if (ret < 0) {
730389d9 354 PERROR("thread quit pipe");
273ea72c
DG
355 goto error;
356 }
357
730389d9
DG
358 for (i = 0; i < 2; i++) {
359 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
360 if (ret < 0) {
361 PERROR("fcntl");
362 goto error;
363 }
364 }
365
273ea72c
DG
366error:
367 return ret;
368}
369
099e26bd
DG
370/*
371 * Stop all threads by closing the thread quit pipe.
372 */
cf3af59e
MD
373static void stop_threads(void)
374{
5eb91c98
DG
375 int ret;
376
cf3af59e
MD
377 /* Stopping all threads */
378 DBG("Terminating all threads");
54d01ffb 379 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
380 if (ret < 0) {
381 ERR("write error on thread quit pipe");
382 }
383
099e26bd 384 /* Dispatch thread */
26c9d55e 385 CMM_STORE_SHARED(dispatch_thread_exit, 1);
099e26bd 386 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
387}
388
fac6795d 389/*
d063d709 390 * Cleanup the daemon
fac6795d 391 */
cf3af59e 392static void cleanup(void)
fac6795d 393{
ef599319 394 int ret;
1d4b027a 395 char *cmd;
af9737e9 396 struct ltt_session *sess, *stmp;
fac6795d 397
1d4b027a 398 DBG("Cleaning up");
e07ae692 399
2f77fc4b
DG
400 /* First thing first, stop all threads */
401 utils_close_pipe(thread_quit_pipe);
402
67e40797
DG
403 DBG("Removing %s directory", rundir);
404 ret = asprintf(&cmd, "rm -rf %s", rundir);
405 if (ret < 0) {
406 ERR("asprintf failed. Something is really wrong!");
407 }
5461b305 408
67e40797
DG
409 /* Remove lttng run directory */
410 ret = system(cmd);
411 if (ret < 0) {
412 ERR("Unable to clean %s", rundir);
1d4b027a 413 }
67e40797 414 free(cmd);
bd69add2 415 free(rundir);
5461b305 416
99bab54f 417 DBG("Cleaning up all sessions");
fac6795d 418
b5541356 419 /* Destroy session list mutex */
273ea72c
DG
420 if (session_list_ptr != NULL) {
421 pthread_mutex_destroy(&session_list_ptr->lock);
422
423 /* Cleanup ALL session */
54d01ffb
DG
424 cds_list_for_each_entry_safe(sess, stmp,
425 &session_list_ptr->head, list) {
2f77fc4b 426 cmd_destroy_session(sess, kernel_poll_pipe[1]);
273ea72c
DG
427 }
428 }
429
099e26bd 430 DBG("Closing all UST sockets");
56fff090 431 ust_app_clean_list();
099e26bd 432
4fba7219
DG
433 if (is_root && !opt_no_kernel) {
434 DBG2("Closing kernel fd");
a4b35e07 435 if (kernel_tracer_fd >= 0) {
76d7553f
MD
436 ret = close(kernel_tracer_fd);
437 if (ret) {
438 PERROR("close");
439 }
a4b35e07 440 }
2f50c8a3 441 DBG("Unloading kernel modules");
096102bd 442 modprobe_remove_lttng_all();
2f50c8a3 443 }
2f77fc4b 444
ef599319 445 utils_close_pipe(kernel_poll_pipe);
ef599319 446 utils_close_pipe(apps_cmd_pipe);
421cb601
DG
447
448 /* <fun> */
f56a39af 449 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
450 "Matthew, BEET driven development works!%c[%dm",
451 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
452 /* </fun> */
fac6795d
DG
453}
454
e065084a 455/*
d063d709 456 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 457 *
d063d709 458 * Return lttcomm error code.
e065084a
DG
459 */
460static int send_unix_sock(int sock, void *buf, size_t len)
461{
462 /* Check valid length */
463 if (len <= 0) {
464 return -1;
465 }
466
467 return lttcomm_send_unix_sock(sock, buf, len);
468}
469
5461b305 470/*
d063d709 471 * Free memory of a command context structure.
5461b305 472 */
a2fb29a5 473static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 474{
a2fb29a5
DG
475 DBG("Clean command context structure");
476 if (*cmd_ctx) {
477 if ((*cmd_ctx)->llm) {
478 free((*cmd_ctx)->llm);
5461b305 479 }
a2fb29a5
DG
480 if ((*cmd_ctx)->lsm) {
481 free((*cmd_ctx)->lsm);
5461b305 482 }
a2fb29a5
DG
483 free(*cmd_ctx);
484 *cmd_ctx = NULL;
5461b305
DG
485 }
486}
487
fac6795d 488/*
0fdd1e2c 489 * Notify UST applications using the shm mmap futex.
fac6795d 490 */
0fdd1e2c 491static int notify_ust_apps(int active)
fac6795d 492{
0fdd1e2c 493 char *wait_shm_mmap;
fac6795d 494
0fdd1e2c 495 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 496
0fdd1e2c
DG
497 /* See shm.c for this call implying mmap, shm and futex calls */
498 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
499 if (wait_shm_mmap == NULL) {
fac6795d
DG
500 goto error;
501 }
502
0fdd1e2c
DG
503 /* Wake waiting process */
504 futex_wait_update((int32_t *) wait_shm_mmap, active);
505
506 /* Apps notified successfully */
507 return 0;
fac6795d
DG
508
509error:
0fdd1e2c 510 return -1;
fac6795d
DG
511}
512
e065084a 513/*
d063d709
DG
514 * Setup the outgoing data buffer for the response (llm) by allocating the
515 * right amount of memory and copying the original information from the lsm
516 * structure.
ca95a216 517 *
d063d709 518 * Return total size of the buffer pointed by buf.
ca95a216 519 */
5461b305 520static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 521{
f3ed775e 522 int ret, buf_size;
ca95a216 523
f3ed775e 524 buf_size = size;
5461b305 525
ba7f0ae5 526 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 527 if (cmd_ctx->llm == NULL) {
76d7553f 528 PERROR("zmalloc");
5461b305 529 ret = -ENOMEM;
ca95a216
DG
530 goto error;
531 }
532
5461b305
DG
533 /* Copy common data */
534 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 535 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 536
5461b305
DG
537 cmd_ctx->llm->data_size = size;
538 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
539
ca95a216
DG
540 return buf_size;
541
542error:
543 return ret;
544}
545
7a485870 546/*
5eb91c98 547 * Update the kernel poll set of all channel fd available over all tracing
d063d709 548 * session. Add the wakeup pipe at the end of the set.
7a485870 549 */
5eb91c98 550static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 551{
5eb91c98 552 int ret;
7a485870
DG
553 struct ltt_session *session;
554 struct ltt_kernel_channel *channel;
555
5eb91c98 556 DBG("Updating kernel poll set");
7a485870 557
54d01ffb 558 session_lock_list();
b5541356 559 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 560 session_lock(session);
7a485870 561 if (session->kernel_session == NULL) {
54d01ffb 562 session_unlock(session);
7a485870
DG
563 continue;
564 }
7a485870 565
54d01ffb
DG
566 cds_list_for_each_entry(channel,
567 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
568 /* Add channel fd to the kernel poll set */
569 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
570 if (ret < 0) {
54d01ffb 571 session_unlock(session);
5eb91c98
DG
572 goto error;
573 }
574 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 575 }
54d01ffb 576 session_unlock(session);
7a485870 577 }
54d01ffb 578 session_unlock_list();
7a485870 579
5eb91c98 580 return 0;
7a485870
DG
581
582error:
54d01ffb 583 session_unlock_list();
7a485870
DG
584 return -1;
585}
586
587/*
54d01ffb 588 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 589 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 590 *
d063d709 591 * Useful for CPU hotplug feature.
7a485870 592 */
2bdd86d4 593static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
594{
595 int ret = 0;
596 struct ltt_session *session;
173af62f 597 struct ltt_kernel_session *ksess;
7a485870
DG
598 struct ltt_kernel_channel *channel;
599
600 DBG("Updating kernel streams for channel fd %d", fd);
601
54d01ffb 602 session_lock_list();
b5541356 603 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 604 session_lock(session);
7a485870 605 if (session->kernel_session == NULL) {
54d01ffb 606 session_unlock(session);
7a485870
DG
607 continue;
608 }
173af62f 609 ksess = session->kernel_session;
d9800920 610
173af62f 611 cds_list_for_each_entry(channel, &ksess->channel_list.head, list) {
7a485870
DG
612 if (channel->fd == fd) {
613 DBG("Channel found, updating kernel streams");
614 ret = kernel_open_channel_stream(channel);
615 if (ret < 0) {
b3c750d2 616 goto error;
7a485870 617 }
d9800920 618
7a485870 619 /*
5eb91c98
DG
620 * Have we already sent fds to the consumer? If yes, it means
621 * that tracing is started so it is safe to send our updated
622 * stream fds.
7a485870 623 */
173af62f
DG
624 if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) {
625 struct lttng_ht_iter iter;
626 struct consumer_socket *socket;
627
628
629 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
630 &iter.iter, socket, node.node) {
631 /* Code flow error */
632 assert(socket->fd >= 0);
633
634 pthread_mutex_lock(socket->lock);
635 ret = kernel_consumer_send_channel_stream(socket->fd,
636 channel, ksess);
637 pthread_mutex_unlock(socket->lock);
638 if (ret < 0) {
639 goto error;
640 }
7a485870
DG
641 }
642 }
b3c750d2 643 goto error;
7a485870
DG
644 }
645 }
54d01ffb 646 session_unlock(session);
7a485870 647 }
54d01ffb 648 session_unlock_list();
b3c750d2 649 return ret;
7a485870 650
b3c750d2 651error:
54d01ffb
DG
652 session_unlock(session);
653 session_unlock_list();
7a485870
DG
654 return ret;
655}
656
487cf67c
DG
657/*
658 * For each tracing session, update newly registered apps.
659 */
660static void update_ust_app(int app_sock)
661{
662 struct ltt_session *sess, *stmp;
663
4ee14516
DG
664 session_lock_list();
665
487cf67c
DG
666 /* For all tracing session(s) */
667 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 668 session_lock(sess);
421cb601
DG
669 if (sess->ust_session) {
670 ust_app_global_update(sess->ust_session, app_sock);
671 }
4ee14516 672 session_unlock(sess);
487cf67c 673 }
4ee14516
DG
674
675 session_unlock_list();
487cf67c
DG
676}
677
7a485870 678/*
d063d709 679 * This thread manage event coming from the kernel.
7a485870 680 *
d063d709
DG
681 * Features supported in this thread:
682 * -) CPU Hotplug
7a485870
DG
683 */
684static void *thread_manage_kernel(void *data)
685{
139ac872 686 int ret, i, pollfd, update_poll_flag = 1, err = -1;
5eb91c98 687 uint32_t revents, nb_fd;
7a485870 688 char tmp;
5eb91c98 689 struct lttng_poll_event events;
7a485870
DG
690
691 DBG("Thread manage kernel started");
692
8ac94142
CB
693 testpoint(thread_manage_kernel);
694
44a5e5eb
DG
695 health_code_update(&health_thread_kernel);
696
8ac94142
CB
697 testpoint(thread_manage_kernel_before_loop);
698
5eb91c98
DG
699 ret = create_thread_poll_set(&events, 2);
700 if (ret < 0) {
76d7553f 701 goto error_poll_create;
5eb91c98
DG
702 }
703
704 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
705 if (ret < 0) {
706 goto error;
707 }
708
7a485870 709 while (1) {
44a5e5eb
DG
710 health_code_update(&health_thread_kernel);
711
7a485870 712 if (update_poll_flag == 1) {
5f822d0a
DG
713 /*
714 * Reset number of fd in the poll set. Always 2 since there is the thread
715 * quit pipe and the kernel pipe.
716 */
717 events.nb_fd = 2;
718
5eb91c98
DG
719 ret = update_kernel_poll(&events);
720 if (ret < 0) {
7a485870
DG
721 goto error;
722 }
723 update_poll_flag = 0;
724 }
725
5eb91c98
DG
726 nb_fd = LTTNG_POLL_GETNB(&events);
727
728 DBG("Thread kernel polling on %d fds", nb_fd);
729
730 /* Zeroed the poll events */
731 lttng_poll_reset(&events);
7a485870
DG
732
733 /* Poll infinite value of time */
88f2b785 734 restart:
44a5e5eb 735 health_poll_update(&health_thread_kernel);
5eb91c98 736 ret = lttng_poll_wait(&events, -1);
44a5e5eb 737 health_poll_update(&health_thread_kernel);
7a485870 738 if (ret < 0) {
88f2b785
MD
739 /*
740 * Restart interrupted system call.
741 */
742 if (errno == EINTR) {
743 goto restart;
744 }
7a485870
DG
745 goto error;
746 } else if (ret == 0) {
747 /* Should not happen since timeout is infinite */
85611738
DG
748 ERR("Return value of poll is 0 with an infinite timeout.\n"
749 "This should not have happened! Continuing...");
7a485870
DG
750 continue;
751 }
752
5eb91c98
DG
753 for (i = 0; i < nb_fd; i++) {
754 /* Fetch once the poll data */
755 revents = LTTNG_POLL_GETEV(&events, i);
756 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 757
44a5e5eb
DG
758 health_code_update(&health_thread_kernel);
759
5eb91c98
DG
760 /* Thread quit pipe has been closed. Killing thread. */
761 ret = check_thread_quit_pipe(pollfd, revents);
762 if (ret) {
139ac872
MD
763 err = 0;
764 goto exit;
5eb91c98 765 }
7a485870 766
5eb91c98
DG
767 /* Check for data on kernel pipe */
768 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
769 ret = read(kernel_poll_pipe[0], &tmp, 1);
770 update_poll_flag = 1;
771 continue;
772 } else {
773 /*
774 * New CPU detected by the kernel. Adding kernel stream to
775 * kernel session and updating the kernel consumer
776 */
777 if (revents & LPOLLIN) {
2bdd86d4 778 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
779 if (ret < 0) {
780 continue;
781 }
782 break;
783 /*
784 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
785 * and unregister kernel stream at this point.
786 */
7a485870 787 }
7a485870
DG
788 }
789 }
790 }
791
139ac872 792exit:
7a485870 793error:
5eb91c98 794 lttng_poll_clean(&events);
76d7553f 795error_poll_create:
139ac872
MD
796 if (err) {
797 health_error(&health_thread_kernel);
798 ERR("Health error occurred in %s", __func__);
799 }
800 health_exit(&health_thread_kernel);
76d7553f 801 DBG("Kernel thread dying");
7a485870
DG
802 return NULL;
803}
804
a23ec3a7
DG
805/*
806 * Signal pthread condition of the consumer data that the thread.
807 */
808static void signal_consumer_condition(struct consumer_data *data, int state)
809{
810 pthread_mutex_lock(&data->cond_mutex);
811
812 /*
813 * The state is set before signaling. It can be any value, it's the waiter
814 * job to correctly interpret this condition variable associated to the
815 * consumer pthread_cond.
816 *
817 * A value of 0 means that the corresponding thread of the consumer data
818 * was not started. 1 indicates that the thread has started and is ready
819 * for action. A negative value means that there was an error during the
820 * thread bootstrap.
821 */
822 data->consumer_thread_is_ready = state;
823 (void) pthread_cond_signal(&data->cond);
824
825 pthread_mutex_unlock(&data->cond_mutex);
826}
827
1d4b027a 828/*
3bd1e081 829 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 830 */
3bd1e081 831static void *thread_manage_consumer(void *data)
1d4b027a 832{
139ac872 833 int sock = -1, i, ret, pollfd, err = -1;
5eb91c98 834 uint32_t revents, nb_fd;
1d4b027a 835 enum lttcomm_return_code code;
5eb91c98 836 struct lttng_poll_event events;
3bd1e081 837 struct consumer_data *consumer_data = data;
1d4b027a 838
3bd1e081 839 DBG("[thread] Manage consumer started");
1d4b027a 840
9449cc75
DG
841 /*
842 * Since the consumer thread can be spawned at any moment in time, we init
843 * the health to a poll status (1, which is a valid health over time).
844 * When the thread starts, we update here the health to a "code" path being
845 * an even value so this thread, when reaching a poll wait, does not
846 * trigger an error with an even value.
847 *
848 * Here is the use case we avoid.
849 *
850 * +1: the first poll update during initialization (main())
851 * +2 * x: multiple code update once in this thread.
852 * +1: poll wait in this thread (being a good health state).
853 * == even number which after the wait period shows as a bad health.
854 *
855 * In a nutshell, the following poll update to the health state brings back
856 * the state to an even value meaning a code path.
857 */
858 health_poll_update(&consumer_data->health);
859
44a5e5eb
DG
860 health_code_update(&consumer_data->health);
861
3bd1e081 862 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a 863 if (ret < 0) {
76d7553f 864 goto error_listen;
1d4b027a
DG
865 }
866
5eb91c98
DG
867 /*
868 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
869 * Nothing more will be added to this poll set.
870 */
871 ret = create_thread_poll_set(&events, 2);
872 if (ret < 0) {
76d7553f 873 goto error_poll;
5eb91c98 874 }
273ea72c 875
3bd1e081 876 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
877 if (ret < 0) {
878 goto error;
879 }
880
881 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c 882
44a5e5eb
DG
883 health_code_update(&consumer_data->health);
884
273ea72c 885 /* Inifinite blocking call, waiting for transmission */
88f2b785 886restart:
44a5e5eb 887 health_poll_update(&consumer_data->health);
8ac94142
CB
888
889 testpoint(thread_manage_consumer);
890
5eb91c98 891 ret = lttng_poll_wait(&events, -1);
44a5e5eb 892 health_poll_update(&consumer_data->health);
273ea72c 893 if (ret < 0) {
88f2b785
MD
894 /*
895 * Restart interrupted system call.
896 */
897 if (errno == EINTR) {
898 goto restart;
899 }
273ea72c
DG
900 goto error;
901 }
902
5eb91c98
DG
903 for (i = 0; i < nb_fd; i++) {
904 /* Fetch once the poll data */
905 revents = LTTNG_POLL_GETEV(&events, i);
906 pollfd = LTTNG_POLL_GETFD(&events, i);
907
44a5e5eb
DG
908 health_code_update(&consumer_data->health);
909
5eb91c98
DG
910 /* Thread quit pipe has been closed. Killing thread. */
911 ret = check_thread_quit_pipe(pollfd, revents);
912 if (ret) {
139ac872
MD
913 err = 0;
914 goto exit;
5eb91c98
DG
915 }
916
917 /* Event on the registration socket */
3bd1e081 918 if (pollfd == consumer_data->err_sock) {
5eb91c98 919 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 920 ERR("consumer err socket poll error");
5eb91c98
DG
921 goto error;
922 }
923 }
273ea72c
DG
924 }
925
3bd1e081 926 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
927 if (sock < 0) {
928 goto error;
929 }
930
44a5e5eb
DG
931 health_code_update(&consumer_data->health);
932
3bd1e081 933 DBG2("Receiving code from consumer err_sock");
ee0b0061 934
712ea556 935 /* Getting status code from kconsumerd */
54d01ffb
DG
936 ret = lttcomm_recv_unix_sock(sock, &code,
937 sizeof(enum lttcomm_return_code));
1d4b027a
DG
938 if (ret <= 0) {
939 goto error;
940 }
941
44a5e5eb
DG
942 health_code_update(&consumer_data->health);
943
f73fabfd 944 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
3bd1e081
MD
945 consumer_data->cmd_sock =
946 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
947 if (consumer_data->cmd_sock < 0) {
a23ec3a7
DG
948 /* On error, signal condition and quit. */
949 signal_consumer_condition(consumer_data, -1);
48842b30 950 PERROR("consumer connect");
1d4b027a
DG
951 goto error;
952 }
a23ec3a7
DG
953 signal_consumer_condition(consumer_data, 1);
954 DBG("Consumer command socket ready");
1d4b027a 955 } else {
3bd1e081 956 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
957 lttcomm_get_readable_code(-code));
958 goto error;
959 }
960
54d01ffb 961 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 962 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 963 if (ret < 0) {
72079cae
DG
964 goto error;
965 }
966
5eb91c98
DG
967 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
968 if (ret < 0) {
72079cae 969 goto error;
5eb91c98
DG
970 }
971
44a5e5eb
DG
972 health_code_update(&consumer_data->health);
973
5eb91c98
DG
974 /* Update number of fd */
975 nb_fd = LTTNG_POLL_GETNB(&events);
976
977 /* Inifinite blocking call, waiting for transmission */
88f2b785 978restart_poll:
44a5e5eb 979 health_poll_update(&consumer_data->health);
5eb91c98 980 ret = lttng_poll_wait(&events, -1);
44a5e5eb 981 health_poll_update(&consumer_data->health);
5eb91c98 982 if (ret < 0) {
88f2b785
MD
983 /*
984 * Restart interrupted system call.
985 */
986 if (errno == EINTR) {
987 goto restart_poll;
988 }
72079cae
DG
989 goto error;
990 }
991
5eb91c98
DG
992 for (i = 0; i < nb_fd; i++) {
993 /* Fetch once the poll data */
994 revents = LTTNG_POLL_GETEV(&events, i);
995 pollfd = LTTNG_POLL_GETFD(&events, i);
996
44a5e5eb
DG
997 health_code_update(&consumer_data->health);
998
5eb91c98
DG
999 /* Thread quit pipe has been closed. Killing thread. */
1000 ret = check_thread_quit_pipe(pollfd, revents);
1001 if (ret) {
139ac872
MD
1002 err = 0;
1003 goto exit;
5eb91c98
DG
1004 }
1005
1006 /* Event on the kconsumerd socket */
1007 if (pollfd == sock) {
1008 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1009 ERR("consumer err socket second poll error");
5eb91c98
DG
1010 goto error;
1011 }
1012 }
1013 }
1014
44a5e5eb
DG
1015 health_code_update(&consumer_data->health);
1016
712ea556 1017 /* Wait for any kconsumerd error */
54d01ffb
DG
1018 ret = lttcomm_recv_unix_sock(sock, &code,
1019 sizeof(enum lttcomm_return_code));
712ea556 1020 if (ret <= 0) {
3bd1e081 1021 ERR("consumer closed the command socket");
712ea556 1022 goto error;
6f61d021 1023 }
1d4b027a 1024
3bd1e081 1025 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1026
139ac872 1027exit:
1d4b027a 1028error:
5c827ce0
DG
1029 /* Immediately set the consumerd state to stopped */
1030 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1031 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1032 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1033 consumer_data->type == LTTNG_CONSUMER32_UST) {
1034 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1035 } else {
1036 /* Code flow error... */
1037 assert(0);
1038 }
1039
76d7553f
MD
1040 if (consumer_data->err_sock >= 0) {
1041 ret = close(consumer_data->err_sock);
1042 if (ret) {
1043 PERROR("close");
1044 }
1045 }
1046 if (consumer_data->cmd_sock >= 0) {
1047 ret = close(consumer_data->cmd_sock);
1048 if (ret) {
1049 PERROR("close");
1050 }
1051 }
1052 if (sock >= 0) {
1053 ret = close(sock);
1054 if (ret) {
1055 PERROR("close");
1056 }
1057 }
273ea72c 1058
3bd1e081
MD
1059 unlink(consumer_data->err_unix_sock_path);
1060 unlink(consumer_data->cmd_unix_sock_path);
1061 consumer_data->pid = 0;
1d4b027a 1062
5eb91c98 1063 lttng_poll_clean(&events);
76d7553f
MD
1064error_poll:
1065error_listen:
139ac872
MD
1066 if (err) {
1067 health_error(&consumer_data->health);
1068 ERR("Health error occurred in %s", __func__);
1069 }
1070 health_exit(&consumer_data->health);
76d7553f 1071 DBG("consumer thread cleanup completed");
0177d773 1072
5eb91c98 1073 return NULL;
099e26bd
DG
1074}
1075
099e26bd
DG
1076/*
1077 * This thread manage application communication.
1d4b027a
DG
1078 */
1079static void *thread_manage_apps(void *data)
099e26bd 1080{
139ac872 1081 int i, ret, pollfd, err = -1;
5eb91c98 1082 uint32_t revents, nb_fd;
099e26bd 1083 struct ust_command ust_cmd;
5eb91c98 1084 struct lttng_poll_event events;
099e26bd
DG
1085
1086 DBG("[thread] Manage application started");
1087
8ac94142
CB
1088 testpoint(thread_manage_apps);
1089
f6a9efaa
DG
1090 rcu_register_thread();
1091 rcu_thread_online();
1092
139ac872 1093 health_code_update(&health_thread_app_manage);
44a5e5eb 1094
5eb91c98
DG
1095 ret = create_thread_poll_set(&events, 2);
1096 if (ret < 0) {
76d7553f 1097 goto error_poll_create;
5eb91c98 1098 }
099e26bd 1099
5eb91c98
DG
1100 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1101 if (ret < 0) {
1102 goto error;
1103 }
099e26bd 1104
8ac94142
CB
1105 testpoint(thread_manage_apps_before_loop);
1106
139ac872 1107 health_code_update(&health_thread_app_manage);
44a5e5eb 1108
5eb91c98
DG
1109 while (1) {
1110 /* Zeroed the events structure */
1111 lttng_poll_reset(&events);
0177d773 1112
5eb91c98 1113 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1114
1115 DBG("Apps thread polling on %d fds", nb_fd);
1116
1117 /* Inifinite blocking call, waiting for transmission */
88f2b785 1118 restart:
139ac872 1119 health_poll_update(&health_thread_app_manage);
5eb91c98 1120 ret = lttng_poll_wait(&events, -1);
139ac872 1121 health_poll_update(&health_thread_app_manage);
099e26bd 1122 if (ret < 0) {
88f2b785
MD
1123 /*
1124 * Restart interrupted system call.
1125 */
1126 if (errno == EINTR) {
1127 goto restart;
1128 }
099e26bd
DG
1129 goto error;
1130 }
1131
5eb91c98
DG
1132 for (i = 0; i < nb_fd; i++) {
1133 /* Fetch once the poll data */
1134 revents = LTTNG_POLL_GETEV(&events, i);
1135 pollfd = LTTNG_POLL_GETFD(&events, i);
1136
139ac872 1137 health_code_update(&health_thread_app_manage);
44a5e5eb 1138
5eb91c98
DG
1139 /* Thread quit pipe has been closed. Killing thread. */
1140 ret = check_thread_quit_pipe(pollfd, revents);
1141 if (ret) {
139ac872
MD
1142 err = 0;
1143 goto exit;
5eb91c98 1144 }
099e26bd 1145
5eb91c98
DG
1146 /* Inspect the apps cmd pipe */
1147 if (pollfd == apps_cmd_pipe[0]) {
1148 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1149 ERR("Apps command pipe error");
0177d773 1150 goto error;
5eb91c98
DG
1151 } else if (revents & LPOLLIN) {
1152 /* Empty pipe */
1153 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1154 if (ret < 0 || ret < sizeof(ust_cmd)) {
76d7553f 1155 PERROR("read apps cmd pipe");
5eb91c98
DG
1156 goto error;
1157 }
099e26bd 1158
139ac872 1159 health_code_update(&health_thread_app_manage);
44a5e5eb 1160
5eb91c98 1161 /* Register applicaton to the session daemon */
56fff090 1162 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1163 ust_cmd.sock);
88ff5b7f 1164 if (ret == -ENOMEM) {
5eb91c98 1165 goto error;
88ff5b7f
MD
1166 } else if (ret < 0) {
1167 break;
5eb91c98
DG
1168 }
1169
139ac872 1170 health_code_update(&health_thread_app_manage);
44a5e5eb 1171
acc7b41b 1172 /*
e0c7ec2b 1173 * Validate UST version compatibility.
acc7b41b 1174 */
e0c7ec2b
DG
1175 ret = ust_app_validate_version(ust_cmd.sock);
1176 if (ret >= 0) {
1177 /*
1178 * Add channel(s) and event(s) to newly registered apps
1179 * from lttng global UST domain.
1180 */
1181 update_ust_app(ust_cmd.sock);
1182 }
acc7b41b 1183
139ac872 1184 health_code_update(&health_thread_app_manage);
44a5e5eb 1185
f2ca2e25 1186 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG
1187 if (ret < 0) {
1188 /*
1189 * If the registration is not possible, we simply
1190 * unregister the apps and continue
1191 */
56fff090 1192 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1193 } else {
1194 /*
622c9ecf
DG
1195 * We only monitor the error events of the socket. This
1196 * thread does not handle any incoming data from UST
1197 * (POLLIN).
5eb91c98 1198 */
622c9ecf
DG
1199 ret = lttng_poll_add(&events, ust_cmd.sock,
1200 LPOLLERR & LPOLLHUP & LPOLLRDHUP);
5eb91c98
DG
1201 if (ret < 0) {
1202 goto error;
1203 }
1204
54d01ffb
DG
1205 DBG("Apps with sock %d added to poll set",
1206 ust_cmd.sock);
5eb91c98 1207 }
487cf67c 1208
139ac872 1209 health_code_update(&health_thread_app_manage);
44a5e5eb 1210
5eb91c98 1211 break;
0177d773 1212 }
5eb91c98
DG
1213 } else {
1214 /*
54d01ffb
DG
1215 * At this point, we know that a registered application made
1216 * the event at poll_wait.
5eb91c98
DG
1217 */
1218 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1219 /* Removing from the poll set */
1220 ret = lttng_poll_del(&events, pollfd);
1221 if (ret < 0) {
1222 goto error;
1223 }
099e26bd 1224
b9d9b220 1225 /* Socket closed on remote end. */
56fff090 1226 ust_app_unregister(pollfd);
5eb91c98
DG
1227 break;
1228 }
099e26bd 1229 }
44a5e5eb 1230
139ac872 1231 health_code_update(&health_thread_app_manage);
099e26bd 1232 }
099e26bd
DG
1233 }
1234
139ac872 1235exit:
099e26bd 1236error:
5eb91c98 1237 lttng_poll_clean(&events);
76d7553f 1238error_poll_create:
139ac872
MD
1239 if (err) {
1240 health_error(&health_thread_app_manage);
1241 ERR("Health error occurred in %s", __func__);
1242 }
1243 health_exit(&health_thread_app_manage);
76d7553f 1244 DBG("Application communication apps thread cleanup complete");
f6a9efaa
DG
1245 rcu_thread_offline();
1246 rcu_unregister_thread();
099e26bd
DG
1247 return NULL;
1248}
1249
1250/*
1251 * Dispatch request from the registration threads to the application
1252 * communication thread.
1253 */
1254static void *thread_dispatch_ust_registration(void *data)
1255{
1256 int ret;
1257 struct cds_wfq_node *node;
1258 struct ust_command *ust_cmd = NULL;
1259
1260 DBG("[thread] Dispatch UST command started");
1261
26c9d55e 1262 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
099e26bd
DG
1263 /* Atomically prepare the queue futex */
1264 futex_nto1_prepare(&ust_cmd_queue.futex);
1265
1266 do {
1267 /* Dequeue command for registration */
1268 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1269 if (node == NULL) {
00a17c97 1270 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1271 /* Continue thread execution */
1272 break;
1273 }
1274
1275 ust_cmd = caa_container_of(node, struct ust_command, node);
1276
2f50c8a3
DG
1277 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1278 " gid:%d sock:%d name:%s (version %d.%d)",
1279 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1280 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1281 ust_cmd->sock, ust_cmd->reg_msg.name,
1282 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1283 /*
1284 * Inform apps thread of the new application registration. This
1285 * call is blocking so we can be assured that the data will be read
1286 * at some point in time or wait to the end of the world :)
1287 */
1288 ret = write(apps_cmd_pipe[1], ust_cmd,
1289 sizeof(struct ust_command));
1290 if (ret < 0) {
76d7553f 1291 PERROR("write apps cmd pipe");
099e26bd
DG
1292 if (errno == EBADF) {
1293 /*
1294 * We can't inform the application thread to process
1295 * registration. We will exit or else application
1296 * registration will not occur and tracing will never
1297 * start.
1298 */
1299 goto error;
1300 }
1301 }
1302 free(ust_cmd);
1303 } while (node != NULL);
1304
1305 /* Futex wait on queue. Blocking call on futex() */
1306 futex_nto1_wait(&ust_cmd_queue.futex);
1307 }
1308
1309error:
1310 DBG("Dispatch thread dying");
1311 return NULL;
1312}
1313
1314/*
1315 * This thread manage application registration.
1316 */
1317static void *thread_registration_apps(void *data)
1d4b027a 1318{
139ac872 1319 int sock = -1, i, ret, pollfd, err = -1;
5eb91c98
DG
1320 uint32_t revents, nb_fd;
1321 struct lttng_poll_event events;
099e26bd
DG
1322 /*
1323 * Get allocated in this thread, enqueued to a global queue, dequeued and
1324 * freed in the manage apps thread.
1325 */
1326 struct ust_command *ust_cmd = NULL;
1d4b027a 1327
099e26bd 1328 DBG("[thread] Manage application registration started");
1d4b027a 1329
8ac94142
CB
1330 testpoint(thread_registration_apps);
1331
1d4b027a
DG
1332 ret = lttcomm_listen_unix_sock(apps_sock);
1333 if (ret < 0) {
76d7553f 1334 goto error_listen;
1d4b027a
DG
1335 }
1336
5eb91c98
DG
1337 /*
1338 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1339 * more will be added to this poll set.
1340 */
1341 ret = create_thread_poll_set(&events, 2);
1342 if (ret < 0) {
76d7553f 1343 goto error_create_poll;
5eb91c98 1344 }
273ea72c 1345
5eb91c98
DG
1346 /* Add the application registration socket */
1347 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1348 if (ret < 0) {
76d7553f 1349 goto error_poll_add;
5eb91c98 1350 }
273ea72c 1351
1d4b027a 1352 /* Notify all applications to register */
0fdd1e2c
DG
1353 ret = notify_ust_apps(1);
1354 if (ret < 0) {
1355 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1356 "Execution continues but there might be problem for already\n"
1357 "running applications that wishes to register.");
0fdd1e2c 1358 }
1d4b027a
DG
1359
1360 while (1) {
1361 DBG("Accepting application registration");
273ea72c 1362
5eb91c98
DG
1363 nb_fd = LTTNG_POLL_GETNB(&events);
1364
273ea72c 1365 /* Inifinite blocking call, waiting for transmission */
88f2b785 1366 restart:
139ac872 1367 health_poll_update(&health_thread_app_reg);
5eb91c98 1368 ret = lttng_poll_wait(&events, -1);
139ac872 1369 health_poll_update(&health_thread_app_reg);
273ea72c 1370 if (ret < 0) {
88f2b785
MD
1371 /*
1372 * Restart interrupted system call.
1373 */
1374 if (errno == EINTR) {
1375 goto restart;
1376 }
273ea72c
DG
1377 goto error;
1378 }
1379
5eb91c98 1380 for (i = 0; i < nb_fd; i++) {
139ac872
MD
1381 health_code_update(&health_thread_app_reg);
1382
5eb91c98
DG
1383 /* Fetch once the poll data */
1384 revents = LTTNG_POLL_GETEV(&events, i);
1385 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1386
5eb91c98
DG
1387 /* Thread quit pipe has been closed. Killing thread. */
1388 ret = check_thread_quit_pipe(pollfd, revents);
1389 if (ret) {
139ac872
MD
1390 err = 0;
1391 goto exit;
90014c57 1392 }
1d4b027a 1393
5eb91c98
DG
1394 /* Event on the registration socket */
1395 if (pollfd == apps_sock) {
1396 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1397 ERR("Register apps socket poll error");
1398 goto error;
1399 } else if (revents & LPOLLIN) {
1400 sock = lttcomm_accept_unix_sock(apps_sock);
1401 if (sock < 0) {
1402 goto error;
1403 }
099e26bd 1404
5eb91c98 1405 /* Create UST registration command for enqueuing */
ba7f0ae5 1406 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1407 if (ust_cmd == NULL) {
76d7553f 1408 PERROR("ust command zmalloc");
5eb91c98
DG
1409 goto error;
1410 }
1d4b027a 1411
5eb91c98
DG
1412 /*
1413 * Using message-based transmissions to ensure we don't
1414 * have to deal with partially received messages.
1415 */
4063050c
MD
1416 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1417 if (ret < 0) {
1418 ERR("Exhausted file descriptors allowed for applications.");
1419 free(ust_cmd);
1420 ret = close(sock);
1421 if (ret) {
1422 PERROR("close");
1423 }
1424 sock = -1;
1425 continue;
1426 }
139ac872 1427 health_code_update(&health_thread_app_reg);
5eb91c98
DG
1428 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1429 sizeof(struct ust_register_msg));
1430 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1431 if (ret < 0) {
76d7553f 1432 PERROR("lttcomm_recv_unix_sock register apps");
5eb91c98
DG
1433 } else {
1434 ERR("Wrong size received on apps register");
1435 }
1436 free(ust_cmd);
76d7553f
MD
1437 ret = close(sock);
1438 if (ret) {
1439 PERROR("close");
1440 }
4063050c 1441 lttng_fd_put(LTTNG_FD_APPS, 1);
76d7553f 1442 sock = -1;
5eb91c98
DG
1443 continue;
1444 }
139ac872 1445 health_code_update(&health_thread_app_reg);
099e26bd 1446
5eb91c98 1447 ust_cmd->sock = sock;
34a2494f 1448 sock = -1;
099e26bd 1449
5eb91c98
DG
1450 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1451 " gid:%d sock:%d name:%s (version %d.%d)",
1452 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1453 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1454 ust_cmd->sock, ust_cmd->reg_msg.name,
1455 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1456
5eb91c98
DG
1457 /*
1458 * Lock free enqueue the registration request. The red pill
54d01ffb 1459 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1460 */
1461 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1462
1463 /*
1464 * Wake the registration queue futex. Implicit memory
1465 * barrier with the exchange in cds_wfq_enqueue.
1466 */
1467 futex_nto1_wake(&ust_cmd_queue.futex);
1468 }
1469 }
90014c57 1470 }
1d4b027a
DG
1471 }
1472
139ac872 1473exit:
1d4b027a 1474error:
139ac872
MD
1475 if (err) {
1476 health_error(&health_thread_app_reg);
1477 ERR("Health error occurred in %s", __func__);
1478 }
1479 health_exit(&health_thread_app_reg);
1480
0fdd1e2c
DG
1481 /* Notify that the registration thread is gone */
1482 notify_ust_apps(0);
1483
a4b35e07 1484 if (apps_sock >= 0) {
76d7553f
MD
1485 ret = close(apps_sock);
1486 if (ret) {
1487 PERROR("close");
1488 }
a4b35e07 1489 }
46c3f085 1490 if (sock >= 0) {
76d7553f
MD
1491 ret = close(sock);
1492 if (ret) {
1493 PERROR("close");
1494 }
4063050c 1495 lttng_fd_put(LTTNG_FD_APPS, 1);
a4b35e07 1496 }
273ea72c 1497 unlink(apps_unix_sock_path);
0fdd1e2c 1498
76d7553f 1499error_poll_add:
5eb91c98 1500 lttng_poll_clean(&events);
76d7553f
MD
1501error_listen:
1502error_create_poll:
1503 DBG("UST Registration thread cleanup complete");
5eb91c98 1504
1d4b027a
DG
1505 return NULL;
1506}
1507
8c0faa1d 1508/*
3bd1e081 1509 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1510 * exec or it will fails.
8c0faa1d 1511 */
3bd1e081 1512static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d 1513{
a23ec3a7 1514 int ret, clock_ret;
ee0b0061
DG
1515 struct timespec timeout;
1516
a23ec3a7
DG
1517 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1518 consumer_data->consumer_thread_is_ready = 0;
8c0faa1d 1519
a23ec3a7
DG
1520 /* Setup pthread condition */
1521 ret = pthread_condattr_init(&consumer_data->condattr);
1522 if (ret != 0) {
1523 errno = ret;
1524 PERROR("pthread_condattr_init consumer data");
1525 goto error;
1526 }
1527
1528 /*
1529 * Set the monotonic clock in order to make sure we DO NOT jump in time
1530 * between the clock_gettime() call and the timedwait call. See bug #324
1531 * for a more details and how we noticed it.
1532 */
1533 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
1534 if (ret != 0) {
1535 errno = ret;
1536 PERROR("pthread_condattr_setclock consumer data");
ee0b0061
DG
1537 goto error;
1538 }
8c0faa1d 1539
a23ec3a7
DG
1540 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
1541 if (ret != 0) {
1542 errno = ret;
1543 PERROR("pthread_cond_init consumer data");
1544 goto error;
1545 }
1546
1547 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
1548 consumer_data);
8c0faa1d 1549 if (ret != 0) {
3bd1e081 1550 PERROR("pthread_create consumer");
ee0b0061 1551 ret = -1;
8c0faa1d
DG
1552 goto error;
1553 }
1554
a23ec3a7
DG
1555 /* We are about to wait on a pthread condition */
1556 pthread_mutex_lock(&consumer_data->cond_mutex);
1557
ee0b0061 1558 /* Get time for sem_timedwait absolute timeout */
a23ec3a7
DG
1559 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
1560 /*
1561 * Set the timeout for the condition timed wait even if the clock gettime
1562 * call fails since we might loop on that call and we want to avoid to
1563 * increment the timeout too many times.
1564 */
1565 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1566
1567 /*
1568 * The following loop COULD be skipped in some conditions so this is why we
1569 * set ret to 0 in order to make sure at least one round of the loop is
1570 * done.
1571 */
1572 ret = 0;
1573
1574 /*
1575 * Loop until the condition is reached or when a timeout is reached. Note
1576 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
1577 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
1578 * possible. This loop does not take any chances and works with both of
1579 * them.
1580 */
1581 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
1582 if (clock_ret < 0) {
1583 PERROR("clock_gettime spawn consumer");
1584 /* Infinite wait for the consumerd thread to be ready */
1585 ret = pthread_cond_wait(&consumer_data->cond,
1586 &consumer_data->cond_mutex);
1587 } else {
1588 ret = pthread_cond_timedwait(&consumer_data->cond,
1589 &consumer_data->cond_mutex, &timeout);
1590 }
ee0b0061 1591 }
8c0faa1d 1592
a23ec3a7
DG
1593 /* Release the pthread condition */
1594 pthread_mutex_unlock(&consumer_data->cond_mutex);
1595
1596 if (ret != 0) {
1597 errno = ret;
1598 if (ret == ETIMEDOUT) {
ee0b0061
DG
1599 /*
1600 * Call has timed out so we kill the kconsumerd_thread and return
1601 * an error.
1602 */
a23ec3a7
DG
1603 ERR("Condition timed out. The consumer thread was never ready."
1604 " Killing it");
3bd1e081 1605 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1606 if (ret < 0) {
3bd1e081 1607 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1608 }
1609 } else {
a23ec3a7 1610 PERROR("pthread_cond_wait failed consumer thread");
ee0b0061
DG
1611 }
1612 goto error;
1613 }
1614
3bd1e081
MD
1615 pthread_mutex_lock(&consumer_data->pid_mutex);
1616 if (consumer_data->pid == 0) {
a23ec3a7 1617 ERR("Consumerd did not start");
3bd1e081 1618 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1619 goto error;
1620 }
3bd1e081 1621 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1622
8c0faa1d
DG
1623 return 0;
1624
1625error:
1626 return ret;
1627}
1628
d9800920 1629/*
3bd1e081 1630 * Join consumer thread
d9800920 1631 */
3bd1e081 1632static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1633{
1634 void *status;
1635 int ret;
1636
e8209f6b
DG
1637 /* Consumer pid must be a real one. */
1638 if (consumer_data->pid > 0) {
3bd1e081 1639 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1640 if (ret) {
3bd1e081 1641 ERR("Error killing consumer daemon");
cf3af59e
MD
1642 return ret;
1643 }
3bd1e081 1644 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1645 } else {
1646 return 0;
1647 }
1648}
1649
8c0faa1d 1650/*
3bd1e081 1651 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1652 *
d063d709 1653 * Return pid if successful else -1.
8c0faa1d 1654 */
3bd1e081 1655static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1656{
1657 int ret;
1658 pid_t pid;
94c55f17 1659 const char *consumer_to_use;
53086306 1660 const char *verbosity;
94c55f17 1661 struct stat st;
8c0faa1d 1662
3bd1e081 1663 DBG("Spawning consumerd");
c49dc785 1664
8c0faa1d
DG
1665 pid = fork();
1666 if (pid == 0) {
1667 /*
3bd1e081 1668 * Exec consumerd.
8c0faa1d 1669 */
daee5345 1670 if (opt_verbose_consumer) {
53086306
DG
1671 verbosity = "--verbose";
1672 } else {
1673 verbosity = "--quiet";
1674 }
3bd1e081
MD
1675 switch (consumer_data->type) {
1676 case LTTNG_CONSUMER_KERNEL:
94c55f17 1677 /*
c7704d57
DG
1678 * Find out which consumerd to execute. We will first try the
1679 * 64-bit path, then the sessiond's installation directory, and
1680 * fallback on the 32-bit one,
94c55f17 1681 */
63a799e8
AM
1682 DBG3("Looking for a kernel consumer at these locations:");
1683 DBG3(" 1) %s", consumerd64_bin);
1684 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1685 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1686 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1687 DBG3("Found location #1");
94c55f17 1688 consumer_to_use = consumerd64_bin;
94c55f17 1689 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1690 DBG3("Found location #2");
94c55f17 1691 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1692 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1693 DBG3("Found location #3");
eb1e0bd4 1694 consumer_to_use = consumerd32_bin;
94c55f17 1695 } else {
63a799e8 1696 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1697 break;
1698 }
1699 DBG("Using kernel consumer at: %s", consumer_to_use);
1700 execl(consumer_to_use,
1701 "lttng-consumerd", verbosity, "-k",
1702 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1703 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1704 NULL);
3bd1e081 1705 break;
7753dea8
MD
1706 case LTTNG_CONSUMER64_UST:
1707 {
b1e0b6b6 1708 char *tmpnew = NULL;
8f4905da
MD
1709
1710 if (consumerd64_libdir[0] != '\0') {
1711 char *tmp;
1712 size_t tmplen;
1713
1714 tmp = getenv("LD_LIBRARY_PATH");
1715 if (!tmp) {
1716 tmp = "";
1717 }
1718 tmplen = strlen("LD_LIBRARY_PATH=")
1719 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1720 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1721 if (!tmpnew) {
1722 ret = -ENOMEM;
1723 goto error;
1724 }
1725 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1726 strcat(tmpnew, consumerd64_libdir);
1727 if (tmp[0] != '\0') {
1728 strcat(tmpnew, ":");
1729 strcat(tmpnew, tmp);
1730 }
1731 ret = putenv(tmpnew);
1732 if (ret) {
1733 ret = -errno;
1734 goto error;
1735 }
1736 }
94c55f17 1737 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1738 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1739 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1740 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1741 NULL);
8f4905da
MD
1742 if (consumerd64_libdir[0] != '\0') {
1743 free(tmpnew);
1744 }
1745 if (ret) {
1746 goto error;
1747 }
3bd1e081 1748 break;
7753dea8
MD
1749 }
1750 case LTTNG_CONSUMER32_UST:
1751 {
937dde8e 1752 char *tmpnew = NULL;
8f4905da
MD
1753
1754 if (consumerd32_libdir[0] != '\0') {
1755 char *tmp;
1756 size_t tmplen;
1757
1758 tmp = getenv("LD_LIBRARY_PATH");
1759 if (!tmp) {
1760 tmp = "";
1761 }
1762 tmplen = strlen("LD_LIBRARY_PATH=")
1763 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1764 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1765 if (!tmpnew) {
1766 ret = -ENOMEM;
1767 goto error;
1768 }
1769 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1770 strcat(tmpnew, consumerd32_libdir);
1771 if (tmp[0] != '\0') {
1772 strcat(tmpnew, ":");
1773 strcat(tmpnew, tmp);
1774 }
1775 ret = putenv(tmpnew);
1776 if (ret) {
1777 ret = -errno;
1778 goto error;
1779 }
1780 }
94c55f17 1781 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1782 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1783 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1784 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1785 NULL);
8f4905da
MD
1786 if (consumerd32_libdir[0] != '\0') {
1787 free(tmpnew);
1788 }
1789 if (ret) {
1790 goto error;
1791 }
7753dea8
MD
1792 break;
1793 }
3bd1e081 1794 default:
76d7553f 1795 PERROR("unknown consumer type");
3bd1e081
MD
1796 exit(EXIT_FAILURE);
1797 }
8c0faa1d 1798 if (errno != 0) {
76d7553f 1799 PERROR("kernel start consumer exec");
8c0faa1d
DG
1800 }
1801 exit(EXIT_FAILURE);
1802 } else if (pid > 0) {
1803 ret = pid;
8c0faa1d 1804 } else {
76d7553f 1805 PERROR("start consumer fork");
8c0faa1d 1806 ret = -errno;
8c0faa1d 1807 }
8f4905da 1808error:
8c0faa1d
DG
1809 return ret;
1810}
1811
693bd40b 1812/*
3bd1e081 1813 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1814 */
3bd1e081 1815static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1816{
1817 int ret;
1818
3bd1e081
MD
1819 pthread_mutex_lock(&consumer_data->pid_mutex);
1820 if (consumer_data->pid != 0) {
1821 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1822 goto end;
1823 }
693bd40b 1824
3bd1e081 1825 ret = spawn_consumerd(consumer_data);
c49dc785 1826 if (ret < 0) {
3bd1e081
MD
1827 ERR("Spawning consumerd failed");
1828 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1829 goto error;
693bd40b 1830 }
c49dc785 1831
3bd1e081
MD
1832 /* Setting up the consumer_data pid */
1833 consumer_data->pid = ret;
48842b30 1834 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1835 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1836
3bd1e081
MD
1837 DBG2("Spawning consumer control thread");
1838 ret = spawn_consumer_thread(consumer_data);
693bd40b 1839 if (ret < 0) {
3bd1e081 1840 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1841 goto error;
1842 }
1843
c49dc785 1844end:
693bd40b
DG
1845 return 0;
1846
1847error:
1848 return ret;
1849}
1850
44a5e5eb 1851/*
139ac872
MD
1852 * Compute health status of each consumer. If one of them is zero (bad
1853 * state), we return 0.
44a5e5eb
DG
1854 */
1855static int check_consumer_health(void)
1856{
1857 int ret;
1858
139ac872
MD
1859 ret = health_check_state(&kconsumer_data.health) &&
1860 health_check_state(&ustconsumer32_data.health) &&
44a5e5eb
DG
1861 health_check_state(&ustconsumer64_data.health);
1862
1863 DBG3("Health consumer check %d", ret);
1864
1865 return ret;
1866}
1867
b73401da 1868/*
096102bd 1869 * Setup necessary data for kernel tracer action.
b73401da 1870 */
096102bd 1871static int init_kernel_tracer(void)
b73401da
DG
1872{
1873 int ret;
b73401da 1874
096102bd
DG
1875 /* Modprobe lttng kernel modules */
1876 ret = modprobe_lttng_control();
b73401da 1877 if (ret < 0) {
b73401da
DG
1878 goto error;
1879 }
1880
096102bd
DG
1881 /* Open debugfs lttng */
1882 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1883 if (kernel_tracer_fd < 0) {
1884 DBG("Failed to open %s", module_proc_lttng);
2f77fc4b
DG
1885 ret = -1;
1886 goto error_open;
54d01ffb
DG
1887 }
1888
2f77fc4b
DG
1889 /* Validate kernel version */
1890 ret = kernel_validate_version(kernel_tracer_fd);
1891 if (ret < 0) {
1892 goto error_version;
b551a063 1893 }
54d01ffb 1894
2f77fc4b
DG
1895 ret = modprobe_lttng_data();
1896 if (ret < 0) {
1897 goto error_modules;
54d01ffb
DG
1898 }
1899
2f77fc4b
DG
1900 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1901 return 0;
1902
1903error_version:
1904 modprobe_remove_lttng_control();
1905 ret = close(kernel_tracer_fd);
1906 if (ret) {
1907 PERROR("close");
b551a063 1908 }
2f77fc4b 1909 kernel_tracer_fd = -1;
f73fabfd 1910 return LTTNG_ERR_KERN_VERSION;
b551a063 1911
2f77fc4b
DG
1912error_modules:
1913 ret = close(kernel_tracer_fd);
1914 if (ret) {
1915 PERROR("close");
b551a063 1916 }
54d01ffb 1917
2f77fc4b
DG
1918error_open:
1919 modprobe_remove_lttng_control();
54d01ffb
DG
1920
1921error:
2f77fc4b
DG
1922 WARN("No kernel tracer available");
1923 kernel_tracer_fd = -1;
1924 if (!is_root) {
f73fabfd 1925 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2f77fc4b 1926 } else {
f73fabfd 1927 return LTTNG_ERR_KERN_NA;
2f77fc4b 1928 }
54d01ffb
DG
1929}
1930
2f77fc4b 1931
54d01ffb 1932/*
2f77fc4b
DG
1933 * Copy consumer output from the tracing session to the domain session. The
1934 * function also applies the right modification on a per domain basis for the
1935 * trace files destination directory.
54d01ffb 1936 */
2f77fc4b 1937static int copy_session_consumer(int domain, struct ltt_session *session)
54d01ffb
DG
1938{
1939 int ret;
2f77fc4b
DG
1940 const char *dir_name;
1941 struct consumer_output *consumer;
1942
1943 assert(session);
1944 assert(session->consumer);
54d01ffb 1945
b551a063
DG
1946 switch (domain) {
1947 case LTTNG_DOMAIN_KERNEL:
2f77fc4b 1948 DBG3("Copying tracing session consumer output in kernel session");
09a90bcd
DG
1949 /*
1950 * XXX: We should audit the session creation and what this function
1951 * does "extra" in order to avoid a destroy since this function is used
1952 * in the domain session creation (kernel and ust) only. Same for UST
1953 * domain.
1954 */
1955 if (session->kernel_session->consumer) {
1956 consumer_destroy_output(session->kernel_session->consumer);
1957 }
2f77fc4b
DG
1958 session->kernel_session->consumer =
1959 consumer_copy_output(session->consumer);
1960 /* Ease our life a bit for the next part */
1961 consumer = session->kernel_session->consumer;
1962 dir_name = DEFAULT_KERNEL_TRACE_DIR;
b551a063
DG
1963 break;
1964 case LTTNG_DOMAIN_UST:
2f77fc4b 1965 DBG3("Copying tracing session consumer output in UST session");
09a90bcd
DG
1966 if (session->ust_session->consumer) {
1967 consumer_destroy_output(session->ust_session->consumer);
1968 }
2f77fc4b
DG
1969 session->ust_session->consumer =
1970 consumer_copy_output(session->consumer);
1971 /* Ease our life a bit for the next part */
1972 consumer = session->ust_session->consumer;
1973 dir_name = DEFAULT_UST_TRACE_DIR;
b551a063
DG
1974 break;
1975 default:
f73fabfd 1976 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
54d01ffb
DG
1977 goto error;
1978 }
1979
2f77fc4b 1980 /* Append correct directory to subdir */
c30ce0b3
CB
1981 strncat(consumer->subdir, dir_name,
1982 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
1983 DBG3("Copy session consumer subdir %s", consumer->subdir);
1984
f73fabfd 1985 ret = LTTNG_OK;
54d01ffb
DG
1986
1987error:
1988 return ret;
1989}
1990
00e2e675 1991/*
2f77fc4b 1992 * Create an UST session and add it to the session ust list.
00e2e675 1993 */
2f77fc4b
DG
1994static int create_ust_session(struct ltt_session *session,
1995 struct lttng_domain *domain)
00e2e675
DG
1996{
1997 int ret;
2f77fc4b 1998 struct ltt_ust_session *lus = NULL;
00e2e675 1999
a4b92340 2000 assert(session);
2f77fc4b
DG
2001 assert(domain);
2002 assert(session->consumer);
a4b92340 2003
2f77fc4b
DG
2004 switch (domain->type) {
2005 case LTTNG_DOMAIN_UST:
2006 break;
2007 default:
2008 ERR("Unknown UST domain on create session %d", domain->type);
f73fabfd 2009 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
00e2e675
DG
2010 goto error;
2011 }
2012
2f77fc4b
DG
2013 DBG("Creating UST session");
2014
2015 lus = trace_ust_create_session(session->path, session->id, domain);
2016 if (lus == NULL) {
f73fabfd 2017 ret = LTTNG_ERR_UST_SESS_FAIL;
a4b92340
DG
2018 goto error;
2019 }
2020
2f77fc4b
DG
2021 lus->uid = session->uid;
2022 lus->gid = session->gid;
2023 session->ust_session = lus;
00e2e675 2024
2f77fc4b
DG
2025 /* Copy session output to the newly created UST session */
2026 ret = copy_session_consumer(domain->type, session);
f73fabfd 2027 if (ret != LTTNG_OK) {
00e2e675
DG
2028 goto error;
2029 }
2030
f73fabfd 2031 return LTTNG_OK;
00e2e675
DG
2032
2033error:
2f77fc4b
DG
2034 free(lus);
2035 session->ust_session = NULL;
00e2e675
DG
2036 return ret;
2037}
2038
2039/*
2f77fc4b 2040 * Create a kernel tracer session then create the default channel.
00e2e675 2041 */
2f77fc4b 2042static int create_kernel_session(struct ltt_session *session)
00e2e675
DG
2043{
2044 int ret;
a4b92340 2045
2f77fc4b 2046 DBG("Creating kernel session");
00e2e675 2047
2f77fc4b
DG
2048 ret = kernel_create_session(session, kernel_tracer_fd);
2049 if (ret < 0) {
f73fabfd 2050 ret = LTTNG_ERR_KERN_SESS_FAIL;
00e2e675
DG
2051 goto error;
2052 }
2053
2f77fc4b
DG
2054 /* Code flow safety */
2055 assert(session->kernel_session);
2056
2057 /* Copy session output to the newly created Kernel session */
2058 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
f73fabfd 2059 if (ret != LTTNG_OK) {
a4b92340
DG
2060 goto error;
2061 }
2062
2f77fc4b
DG
2063 /* Create directory(ies) on local filesystem. */
2064 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2065 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2066 ret = run_as_mkdir_recursive(
2067 session->kernel_session->consumer->dst.trace_path,
2068 S_IRWXU | S_IRWXG, session->uid, session->gid);
2069 if (ret < 0) {
2070 if (ret != -EEXIST) {
2071 ERR("Trace directory creation error");
00e2e675
DG
2072 goto error;
2073 }
00e2e675 2074 }
2f77fc4b 2075 }
00e2e675 2076
2f77fc4b
DG
2077 session->kernel_session->uid = session->uid;
2078 session->kernel_session->gid = session->gid;
00e2e675 2079
f73fabfd 2080 return LTTNG_OK;
00e2e675 2081
2f77fc4b
DG
2082error:
2083 trace_kernel_destroy_session(session->kernel_session);
2084 session->kernel_session = NULL;
2085 return ret;
2086}
00e2e675 2087
2f77fc4b
DG
2088/*
2089 * Count number of session permitted by uid/gid.
2090 */
2091static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2092{
2093 unsigned int i = 0;
2094 struct ltt_session *session;
07424f16 2095
2f77fc4b
DG
2096 DBG("Counting number of available session for UID %d GID %d",
2097 uid, gid);
2098 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
00e2e675 2099 /*
2f77fc4b 2100 * Only list the sessions the user can control.
00e2e675 2101 */
2f77fc4b
DG
2102 if (!session_access_ok(session, uid, gid)) {
2103 continue;
2104 }
2105 i++;
a4b92340 2106 }
2f77fc4b 2107 return i;
00e2e675
DG
2108}
2109
54d01ffb
DG
2110/*
2111 * Process the command requested by the lttng client within the command
2112 * context structure. This function make sure that the return structure (llm)
2113 * is set and ready for transmission before returning.
2114 *
2115 * Return any error encountered or 0 for success.
53a80697
MD
2116 *
2117 * "sock" is only used for special-case var. len data.
54d01ffb 2118 */
53a80697
MD
2119static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2120 int *sock_error)
54d01ffb 2121{
f73fabfd 2122 int ret = LTTNG_OK;
44d3bd01 2123 int need_tracing_session = 1;
2e09ba09 2124 int need_domain;
54d01ffb
DG
2125
2126 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2127
53a80697
MD
2128 *sock_error = 0;
2129
2e09ba09
MD
2130 switch (cmd_ctx->lsm->cmd_type) {
2131 case LTTNG_CREATE_SESSION:
2132 case LTTNG_DESTROY_SESSION:
2133 case LTTNG_LIST_SESSIONS:
2134 case LTTNG_LIST_DOMAINS:
2135 case LTTNG_START_TRACE:
2136 case LTTNG_STOP_TRACE:
6d805429 2137 case LTTNG_DATA_PENDING:
2e09ba09 2138 need_domain = 0;
3aace903 2139 break;
2e09ba09
MD
2140 default:
2141 need_domain = 1;
2142 }
2143
2144 if (opt_no_kernel && need_domain
2145 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
531d29f9 2146 if (!is_root) {
f73fabfd 2147 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
531d29f9 2148 } else {
f73fabfd 2149 ret = LTTNG_ERR_KERN_NA;
531d29f9 2150 }
4fba7219
DG
2151 goto error;
2152 }
2153
8d3113b2
DG
2154 /* Deny register consumer if we already have a spawned consumer. */
2155 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
2156 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2157 if (kconsumer_data.pid > 0) {
f73fabfd 2158 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
fa317f24 2159 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
8d3113b2
DG
2160 goto error;
2161 }
2162 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2163 }
2164
54d01ffb
DG
2165 /*
2166 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2167 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2168 * command.
2169 */
2170 switch(cmd_ctx->lsm->cmd_type) {
2171 case LTTNG_LIST_SESSIONS:
2172 case LTTNG_LIST_TRACEPOINTS:
f37d259d 2173 case LTTNG_LIST_TRACEPOINT_FIELDS:
54d01ffb
DG
2174 case LTTNG_LIST_DOMAINS:
2175 case LTTNG_LIST_CHANNELS:
2176 case LTTNG_LIST_EVENTS:
2177 break;
2178 default:
2179 /* Setup lttng message with no payload */
2180 ret = setup_lttng_msg(cmd_ctx, 0);
2181 if (ret < 0) {
2182 /* This label does not try to unlock the session */
2183 goto init_setup_error;
2184 }
2185 }
2186
2187 /* Commands that DO NOT need a session. */
2188 switch (cmd_ctx->lsm->cmd_type) {
54d01ffb 2189 case LTTNG_CREATE_SESSION:
2e09ba09 2190 case LTTNG_CALIBRATE:
54d01ffb
DG
2191 case LTTNG_LIST_SESSIONS:
2192 case LTTNG_LIST_TRACEPOINTS:
f37d259d 2193 case LTTNG_LIST_TRACEPOINT_FIELDS:
44d3bd01 2194 need_tracing_session = 0;
54d01ffb
DG
2195 break;
2196 default:
2197 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
256a5576
MD
2198 /*
2199 * We keep the session list lock across _all_ commands
2200 * for now, because the per-session lock does not
2201 * handle teardown properly.
2202 */
74babd95 2203 session_lock_list();
54d01ffb
DG
2204 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2205 if (cmd_ctx->session == NULL) {
2206 if (cmd_ctx->lsm->session.name != NULL) {
f73fabfd 2207 ret = LTTNG_ERR_SESS_NOT_FOUND;
54d01ffb
DG
2208 } else {
2209 /* If no session name specified */
f73fabfd 2210 ret = LTTNG_ERR_SELECT_SESS;
54d01ffb
DG
2211 }
2212 goto error;
2213 } else {
2214 /* Acquire lock for the session */
2215 session_lock(cmd_ctx->session);
2216 }
2217 break;
2218 }
b389abbe 2219
2e09ba09
MD
2220 if (!need_domain) {
2221 goto skip_domain;
2222 }
a4b92340 2223
54d01ffb
DG
2224 /*
2225 * Check domain type for specific "pre-action".
2226 */
2227 switch (cmd_ctx->lsm->domain.type) {
2228 case LTTNG_DOMAIN_KERNEL:
d1f1c568 2229 if (!is_root) {
f73fabfd 2230 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
d1f1c568
DG
2231 goto error;
2232 }
2233
54d01ffb 2234 /* Kernel tracer check */
a4b35e07 2235 if (kernel_tracer_fd == -1) {
54d01ffb 2236 /* Basically, load kernel tracer modules */
096102bd
DG
2237 ret = init_kernel_tracer();
2238 if (ret != 0) {
54d01ffb
DG
2239 goto error;
2240 }
2241 }
5eb91c98 2242
5c827ce0
DG
2243 /* Consumer is in an ERROR state. Report back to client */
2244 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
f73fabfd 2245 ret = LTTNG_ERR_NO_KERNCONSUMERD;
5c827ce0
DG
2246 goto error;
2247 }
2248
54d01ffb 2249 /* Need a session for kernel command */
44d3bd01 2250 if (need_tracing_session) {
54d01ffb 2251 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 2252 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2253 if (ret < 0) {
f73fabfd 2254 ret = LTTNG_ERR_KERN_SESS_FAIL;
5eb91c98
DG
2255 goto error;
2256 }
b389abbe 2257 }
7d29a247 2258
54d01ffb 2259 /* Start the kernel consumer daemon */
3bd1e081
MD
2260 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2261 if (kconsumer_data.pid == 0 &&
a4b92340
DG
2262 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER &&
2263 cmd_ctx->session->start_consumer) {
3bd1e081
MD
2264 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2265 ret = start_consumerd(&kconsumer_data);
7d29a247 2266 if (ret < 0) {
f73fabfd 2267 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
54d01ffb 2268 goto error;
950131af 2269 }
5c827ce0 2270 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
3ff2ecac
MD
2271 } else {
2272 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 2273 }
173af62f 2274
a4b92340
DG
2275 /*
2276 * The consumer was just spawned so we need to add the socket to
2277 * the consumer output of the session if exist.
2278 */
2279 ret = consumer_create_socket(&kconsumer_data,
2280 cmd_ctx->session->kernel_session->consumer);
2281 if (ret < 0) {
2282 goto error;
173af62f 2283 }
0d0c377a 2284 }
5c827ce0 2285
54d01ffb 2286 break;
2bdd86d4 2287 case LTTNG_DOMAIN_UST:
44d3bd01 2288 {
5c827ce0
DG
2289 /* Consumer is in an ERROR state. Report back to client */
2290 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
f73fabfd 2291 ret = LTTNG_ERR_NO_USTCONSUMERD;
5c827ce0
DG
2292 goto error;
2293 }
2294
44d3bd01 2295 if (need_tracing_session) {
a4b92340 2296 /* Create UST session if none exist. */
f6a9efaa 2297 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 2298 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 2299 &cmd_ctx->lsm->domain);
f73fabfd 2300 if (ret != LTTNG_OK) {
44d3bd01
DG
2301 goto error;
2302 }
2303 }
00e2e675 2304
7753dea8
MD
2305 /* Start the UST consumer daemons */
2306 /* 64-bit */
2307 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 2308 if (consumerd64_bin[0] != '\0' &&
7753dea8 2309 ustconsumer64_data.pid == 0 &&
a4b92340
DG
2310 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER &&
2311 cmd_ctx->session->start_consumer) {
7753dea8
MD
2312 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2313 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 2314 if (ret < 0) {
f73fabfd 2315 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
173af62f 2316 uatomic_set(&ust_consumerd64_fd, -EINVAL);
2bdd86d4
MD
2317 goto error;
2318 }
48842b30 2319
173af62f 2320 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
5c827ce0 2321 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3ff2ecac 2322 } else {
7753dea8
MD
2323 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2324 }
173af62f
DG
2325
2326 /*
2327 * Setup socket for consumer 64 bit. No need for atomic access
2328 * since it was set above and can ONLY be set in this thread.
2329 */
a4b92340
DG
2330 ret = consumer_create_socket(&ustconsumer64_data,
2331 cmd_ctx->session->ust_session->consumer);
2332 if (ret < 0) {
2333 goto error;
173af62f
DG
2334 }
2335
7753dea8 2336 /* 32-bit */
fc7a59ce 2337 if (consumerd32_bin[0] != '\0' &&
7753dea8 2338 ustconsumer32_data.pid == 0 &&
a4b92340
DG
2339 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER &&
2340 cmd_ctx->session->start_consumer) {
7753dea8
MD
2341 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2342 ret = start_consumerd(&ustconsumer32_data);
2343 if (ret < 0) {
f73fabfd 2344 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
173af62f 2345 uatomic_set(&ust_consumerd32_fd, -EINVAL);
7753dea8
MD
2346 goto error;
2347 }
5c827ce0 2348
173af62f 2349 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
5c827ce0 2350 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
7753dea8
MD
2351 } else {
2352 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 2353 }
173af62f
DG
2354
2355 /*
2356 * Setup socket for consumer 64 bit. No need for atomic access
2357 * since it was set above and can ONLY be set in this thread.
2358 */
a4b92340
DG
2359 ret = consumer_create_socket(&ustconsumer32_data,
2360 cmd_ctx->session->ust_session->consumer);
2361 if (ret < 0) {
2362 goto error;
173af62f 2363 }
44d3bd01
DG
2364 }
2365 break;
48842b30 2366 }
54d01ffb 2367 default:
54d01ffb
DG
2368 break;
2369 }
2e09ba09 2370skip_domain:
33a2b854 2371
5c827ce0
DG
2372 /* Validate consumer daemon state when start/stop trace command */
2373 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
2374 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
2375 switch (cmd_ctx->lsm->domain.type) {
2376 case LTTNG_DOMAIN_UST:
2377 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
f73fabfd 2378 ret = LTTNG_ERR_NO_USTCONSUMERD;
5c827ce0
DG
2379 goto error;
2380 }
2381 break;
2382 case LTTNG_DOMAIN_KERNEL:
2383 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
f73fabfd 2384 ret = LTTNG_ERR_NO_KERNCONSUMERD;
5c827ce0
DG
2385 goto error;
2386 }
2387 break;
2388 }
2389 }
2390
8e0af1b4
MD
2391 /*
2392 * Check that the UID or GID match that of the tracing session.
2393 * The root user can interact with all sessions.
2394 */
2395 if (need_tracing_session) {
2396 if (!session_access_ok(cmd_ctx->session,
730389d9
DG
2397 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2398 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
f73fabfd 2399 ret = LTTNG_ERR_EPERM;
8e0af1b4
MD
2400 goto error;
2401 }
2402 }
2403
54d01ffb
DG
2404 /* Process by command type */
2405 switch (cmd_ctx->lsm->cmd_type) {
2406 case LTTNG_ADD_CONTEXT:
2407 {
2408 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2409 cmd_ctx->lsm->u.context.channel_name,
2410 cmd_ctx->lsm->u.context.event_name,
2411 &cmd_ctx->lsm->u.context.ctx);
2412 break;
2413 }
2414 case LTTNG_DISABLE_CHANNEL:
2415 {
2416 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2417 cmd_ctx->lsm->u.disable.channel_name);
2418 break;
2419 }
2420 case LTTNG_DISABLE_EVENT:
2421 {
2422 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2423 cmd_ctx->lsm->u.disable.channel_name,
2424 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2425 break;
2426 }
54d01ffb
DG
2427 case LTTNG_DISABLE_ALL_EVENT:
2428 {
2bdd86d4 2429 DBG("Disabling all events");
54d01ffb
DG
2430
2431 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2432 cmd_ctx->lsm->u.disable.channel_name);
2433 break;
2434 }
00e2e675
DG
2435 case LTTNG_DISABLE_CONSUMER:
2436 {
2437 ret = cmd_disable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session);
2438 break;
2439 }
54d01ffb
DG
2440 case LTTNG_ENABLE_CHANNEL:
2441 {
aea829b3 2442 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2f77fc4b 2443 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
54d01ffb
DG
2444 break;
2445 }
00e2e675
DG
2446 case LTTNG_ENABLE_CONSUMER:
2447 {
a4b92340
DG
2448 /*
2449 * XXX: 0 means that this URI should be applied on the session. Should
2450 * be a DOMAIN enuam.
2451 */
00e2e675 2452 ret = cmd_enable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session);
f73fabfd 2453 if (ret != LTTNG_OK) {
a4b92340
DG
2454 goto error;
2455 }
2456
2457 if (cmd_ctx->lsm->domain.type == 0) {
2458 /* Add the URI for the UST session if a consumer is present. */
2459 if (cmd_ctx->session->ust_session &&
2460 cmd_ctx->session->ust_session->consumer) {
2461 ret = cmd_enable_consumer(LTTNG_DOMAIN_UST, cmd_ctx->session);
2462 } else if (cmd_ctx->session->kernel_session &&
2463 cmd_ctx->session->kernel_session->consumer) {
2464 ret = cmd_enable_consumer(LTTNG_DOMAIN_KERNEL,
2465 cmd_ctx->session);
2466 }
2467 }
00e2e675
DG
2468 break;
2469 }
54d01ffb
DG
2470 case LTTNG_ENABLE_EVENT:
2471 {
2472 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2473 cmd_ctx->lsm->u.enable.channel_name,
2f77fc4b 2474 &cmd_ctx->lsm->u.enable.event, kernel_poll_pipe[1]);
54d01ffb
DG
2475 break;
2476 }
2477 case LTTNG_ENABLE_ALL_EVENT:
2478 {
2bdd86d4 2479 DBG("Enabling all events");
54d01ffb
DG
2480
2481 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521 2482 cmd_ctx->lsm->u.enable.channel_name,
2f77fc4b 2483 cmd_ctx->lsm->u.enable.event.type, kernel_poll_pipe[1]);
54d01ffb
DG
2484 break;
2485 }
052da939 2486 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2487 {
9f19cc17 2488 struct lttng_event *events;
54d01ffb 2489 ssize_t nb_events;
052da939 2490
54d01ffb
DG
2491 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2492 if (nb_events < 0) {
f73fabfd 2493 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2494 ret = -nb_events;
2495 goto error;
2ef84c95
DG
2496 }
2497
2498 /*
2499 * Setup lttng message with payload size set to the event list size in
2500 * bytes and then copy list into the llm payload.
2501 */
052da939 2502 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2503 if (ret < 0) {
052da939 2504 free(events);
2ef84c95
DG
2505 goto setup_error;
2506 }
2507
2508 /* Copy event list into message payload */
9f19cc17 2509 memcpy(cmd_ctx->llm->payload, events,
052da939 2510 sizeof(struct lttng_event) * nb_events);
2ef84c95 2511
9f19cc17 2512 free(events);
2ef84c95 2513
f73fabfd 2514 ret = LTTNG_OK;
2ef84c95
DG
2515 break;
2516 }
f37d259d
MD
2517 case LTTNG_LIST_TRACEPOINT_FIELDS:
2518 {
2519 struct lttng_event_field *fields;
2520 ssize_t nb_fields;
2521
a4b92340
DG
2522 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
2523 &fields);
f37d259d 2524 if (nb_fields < 0) {
f73fabfd 2525 /* Return value is a negative lttng_error_code. */
f37d259d
MD
2526 ret = -nb_fields;
2527 goto error;
2528 }
2529
2530 /*
2531 * Setup lttng message with payload size set to the event list size in
2532 * bytes and then copy list into the llm payload.
2533 */
a4b92340
DG
2534 ret = setup_lttng_msg(cmd_ctx,
2535 sizeof(struct lttng_event_field) * nb_fields);
f37d259d
MD
2536 if (ret < 0) {
2537 free(fields);
2538 goto setup_error;
2539 }
2540
2541 /* Copy event list into message payload */
2542 memcpy(cmd_ctx->llm->payload, fields,
2543 sizeof(struct lttng_event_field) * nb_fields);
2544
2545 free(fields);
2546
f73fabfd 2547 ret = LTTNG_OK;
f37d259d
MD
2548 break;
2549 }
00e2e675
DG
2550 case LTTNG_SET_CONSUMER_URI:
2551 {
a4b92340
DG
2552 size_t nb_uri, len;
2553 struct lttng_uri *uris;
2554
2555 nb_uri = cmd_ctx->lsm->u.uri.size;
2556 len = nb_uri * sizeof(struct lttng_uri);
2557
2558 if (nb_uri == 0) {
f73fabfd 2559 ret = LTTNG_ERR_INVALID;
a4b92340
DG
2560 goto error;
2561 }
2562
2563 uris = zmalloc(len);
2564 if (uris == NULL) {
f73fabfd 2565 ret = LTTNG_ERR_FATAL;
a4b92340
DG
2566 goto error;
2567 }
2568
2569 /* Receive variable len data */
77c7c900 2570 DBG("Receiving %zu URI(s) from client ...", nb_uri);
a4b92340
DG
2571 ret = lttcomm_recv_unix_sock(sock, uris, len);
2572 if (ret <= 0) {
2573 DBG("No URIs received from client... continuing");
2574 *sock_error = 1;
f73fabfd 2575 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2576 free(uris);
a4b92340
DG
2577 goto error;
2578 }
2579
00e2e675 2580 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
a4b92340 2581 nb_uri, uris);
f73fabfd 2582 if (ret != LTTNG_OK) {
b1d41407 2583 free(uris);
a4b92340
DG
2584 goto error;
2585 }
2586
2587 /*
2588 * XXX: 0 means that this URI should be applied on the session. Should
2589 * be a DOMAIN enuam.
2590 */
2591 if (cmd_ctx->lsm->domain.type == 0) {
2592 /* Add the URI for the UST session if a consumer is present. */
2593 if (cmd_ctx->session->ust_session &&
2594 cmd_ctx->session->ust_session->consumer) {
2595 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session,
2596 nb_uri, uris);
2597 } else if (cmd_ctx->session->kernel_session &&
2598 cmd_ctx->session->kernel_session->consumer) {
2599 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL,
2600 cmd_ctx->session, nb_uri, uris);
2601 }
2602 }
2603
b1d41407
DG
2604 free(uris);
2605
00e2e675
DG
2606 break;
2607 }
f3ed775e 2608 case LTTNG_START_TRACE:
8c0faa1d 2609 {
54d01ffb 2610 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2611 break;
2612 }
f3ed775e 2613 case LTTNG_STOP_TRACE:
8c0faa1d 2614 {
54d01ffb 2615 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2616 break;
2617 }
5e16da05
MD
2618 case LTTNG_CREATE_SESSION:
2619 {
a4b92340
DG
2620 size_t nb_uri, len;
2621 struct lttng_uri *uris = NULL;
2622
2623 nb_uri = cmd_ctx->lsm->u.uri.size;
2624 len = nb_uri * sizeof(struct lttng_uri);
2625
2626 if (nb_uri > 0) {
2627 uris = zmalloc(len);
2628 if (uris == NULL) {
f73fabfd 2629 ret = LTTNG_ERR_FATAL;
a4b92340
DG
2630 goto error;
2631 }
2632
2633 /* Receive variable len data */
77c7c900 2634 DBG("Waiting for %zu URIs from client ...", nb_uri);
a4b92340
DG
2635 ret = lttcomm_recv_unix_sock(sock, uris, len);
2636 if (ret <= 0) {
2637 DBG("No URIs received from client... continuing");
2638 *sock_error = 1;
f73fabfd 2639 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2640 free(uris);
a4b92340
DG
2641 goto error;
2642 }
2643
2644 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
2645 DBG("Creating session with ONE network URI is a bad call");
f73fabfd 2646 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2647 free(uris);
a4b92340
DG
2648 goto error;
2649 }
2650 }
2651
2652 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
2653 &cmd_ctx->creds);
2654
b1d41407
DG
2655 free(uris);
2656
00e2e675
DG
2657 break;
2658 }
5e16da05
MD
2659 case LTTNG_DESTROY_SESSION:
2660 {
2f77fc4b 2661 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
a4b92340
DG
2662
2663 /* Set session to NULL so we do not unlock it after free. */
256a5576 2664 cmd_ctx->session = NULL;
5461b305 2665 break;
5e16da05 2666 }
9f19cc17 2667 case LTTNG_LIST_DOMAINS:
5e16da05 2668 {
54d01ffb
DG
2669 ssize_t nb_dom;
2670 struct lttng_domain *domains;
5461b305 2671
54d01ffb
DG
2672 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2673 if (nb_dom < 0) {
f73fabfd 2674 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2675 ret = -nb_dom;
2676 goto error;
ce3d728c 2677 }
520ff687 2678
54d01ffb 2679 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
2680 if (ret < 0) {
2681 goto setup_error;
520ff687 2682 }
57167058 2683
54d01ffb
DG
2684 /* Copy event list into message payload */
2685 memcpy(cmd_ctx->llm->payload, domains,
2686 nb_dom * sizeof(struct lttng_domain));
2687
2688 free(domains);
5e16da05 2689
f73fabfd 2690 ret = LTTNG_OK;
5e16da05
MD
2691 break;
2692 }
9f19cc17 2693 case LTTNG_LIST_CHANNELS:
5e16da05 2694 {
6775595e 2695 int nb_chan;
54d01ffb
DG
2696 struct lttng_channel *channels;
2697
b551a063
DG
2698 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
2699 cmd_ctx->session, &channels);
54d01ffb 2700 if (nb_chan < 0) {
f73fabfd 2701 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2702 ret = -nb_chan;
2703 goto error;
5461b305 2704 }
ca95a216 2705
54d01ffb 2706 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
2707 if (ret < 0) {
2708 goto setup_error;
2709 }
9f19cc17 2710
54d01ffb
DG
2711 /* Copy event list into message payload */
2712 memcpy(cmd_ctx->llm->payload, channels,
2713 nb_chan * sizeof(struct lttng_channel));
2714
2715 free(channels);
9f19cc17 2716
f73fabfd 2717 ret = LTTNG_OK;
5461b305 2718 break;
5e16da05 2719 }
9f19cc17 2720 case LTTNG_LIST_EVENTS:
5e16da05 2721 {
b551a063 2722 ssize_t nb_event;
684d34d2 2723 struct lttng_event *events = NULL;
9f19cc17 2724
b551a063 2725 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
2726 cmd_ctx->lsm->u.list.channel_name, &events);
2727 if (nb_event < 0) {
f73fabfd 2728 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2729 ret = -nb_event;
2730 goto error;
5461b305 2731 }
ca95a216 2732
54d01ffb 2733 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
2734 if (ret < 0) {
2735 goto setup_error;
2736 }
9f19cc17 2737
54d01ffb
DG
2738 /* Copy event list into message payload */
2739 memcpy(cmd_ctx->llm->payload, events,
2740 nb_event * sizeof(struct lttng_event));
9f19cc17 2741
54d01ffb 2742 free(events);
9f19cc17 2743
f73fabfd 2744 ret = LTTNG_OK;
5461b305 2745 break;
5e16da05
MD
2746 }
2747 case LTTNG_LIST_SESSIONS:
2748 {
8e0af1b4 2749 unsigned int nr_sessions;
5461b305 2750
8e0af1b4 2751 session_lock_list();
730389d9
DG
2752 nr_sessions = lttng_sessions_count(
2753 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2754 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
d32fb093 2755
8e0af1b4 2756 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 2757 if (ret < 0) {
54d01ffb 2758 session_unlock_list();
5461b305 2759 goto setup_error;
e065084a 2760 }
5e16da05 2761
6c9cc2ab 2762 /* Filled the session array */
2f77fc4b 2763 cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
730389d9
DG
2764 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2765 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
6c9cc2ab 2766
54d01ffb 2767 session_unlock_list();
5e16da05 2768
f73fabfd 2769 ret = LTTNG_OK;
5e16da05
MD
2770 break;
2771 }
d0254c7c
MD
2772 case LTTNG_CALIBRATE:
2773 {
54d01ffb
DG
2774 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
2775 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
2776 break;
2777 }
d9800920
DG
2778 case LTTNG_REGISTER_CONSUMER:
2779 {
2f77fc4b
DG
2780 struct consumer_data *cdata;
2781
2782 switch (cmd_ctx->lsm->domain.type) {
2783 case LTTNG_DOMAIN_KERNEL:
2784 cdata = &kconsumer_data;
2785 break;
2786 default:
f73fabfd 2787 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2788 goto error;
2789 }
2790
54d01ffb 2791 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2f77fc4b 2792 cmd_ctx->lsm->u.reg.path, cdata);
d9800920
DG
2793 break;
2794 }
53a80697
MD
2795 case LTTNG_SET_FILTER:
2796 {
2797 struct lttng_filter_bytecode *bytecode;
2798
d93c4f1f 2799 if (cmd_ctx->lsm->u.filter.bytecode_len > LTTNG_FILTER_MAX_LEN) {
f73fabfd 2800 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
2801 goto error;
2802 }
2803 bytecode = zmalloc(cmd_ctx->lsm->u.filter.bytecode_len);
2804 if (!bytecode) {
f73fabfd 2805 ret = LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
2806 goto error;
2807 }
2808 /* Receive var. len. data */
2809 DBG("Receiving var len data from client ...");
2810 ret = lttcomm_recv_unix_sock(sock, bytecode,
2811 cmd_ctx->lsm->u.filter.bytecode_len);
2812 if (ret <= 0) {
2813 DBG("Nothing recv() from client var len data... continuing");
2814 *sock_error = 1;
f73fabfd 2815 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
2816 goto error;
2817 }
2818
2819 if (bytecode->len + sizeof(*bytecode)
2820 != cmd_ctx->lsm->u.filter.bytecode_len) {
2821 free(bytecode);
f73fabfd 2822 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
2823 goto error;
2824 }
2825
2826 ret = cmd_set_filter(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2827 cmd_ctx->lsm->u.filter.channel_name,
2828 cmd_ctx->lsm->u.filter.event_name,
2829 bytecode);
2830 break;
2831 }
6d805429 2832 case LTTNG_DATA_PENDING:
806e2684 2833 {
6d805429 2834 ret = cmd_data_pending(cmd_ctx->session);
806e2684
DG
2835 break;
2836 }
5e16da05 2837 default:
f73fabfd 2838 ret = LTTNG_ERR_UND;
5461b305 2839 break;
fac6795d
DG
2840 }
2841
5461b305 2842error:
5461b305
DG
2843 if (cmd_ctx->llm == NULL) {
2844 DBG("Missing llm structure. Allocating one.");
894be886 2845 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
2846 goto setup_error;
2847 }
2848 }
54d01ffb 2849 /* Set return code */
5461b305 2850 cmd_ctx->llm->ret_code = ret;
5461b305 2851setup_error:
b5541356 2852 if (cmd_ctx->session) {
54d01ffb 2853 session_unlock(cmd_ctx->session);
b5541356 2854 }
256a5576
MD
2855 if (need_tracing_session) {
2856 session_unlock_list();
2857 }
54d01ffb 2858init_setup_error:
8028d920 2859 return ret;
fac6795d
DG
2860}
2861
44a5e5eb
DG
2862/*
2863 * Thread managing health check socket.
2864 */
2865static void *thread_manage_health(void *data)
2866{
eb4a2943 2867 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
44a5e5eb
DG
2868 uint32_t revents, nb_fd;
2869 struct lttng_poll_event events;
2870 struct lttcomm_health_msg msg;
2871 struct lttcomm_health_data reply;
2872
2873 DBG("[thread] Manage health check started");
2874
2875 rcu_register_thread();
2876
2877 /* Create unix socket */
2878 sock = lttcomm_create_unix_sock(health_unix_sock_path);
2879 if (sock < 0) {
2880 ERR("Unable to create health check Unix socket");
2881 ret = -1;
2882 goto error;
2883 }
2884
2885 ret = lttcomm_listen_unix_sock(sock);
2886 if (ret < 0) {
2887 goto error;
2888 }
2889
2890 /*
2891 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2892 * more will be added to this poll set.
2893 */
2894 ret = create_thread_poll_set(&events, 2);
2895 if (ret < 0) {
2896 goto error;
2897 }
2898
2899 /* Add the application registration socket */
2900 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
2901 if (ret < 0) {
2902 goto error;
2903 }
2904
2905 while (1) {
2906 DBG("Health check ready");
2907
2908 nb_fd = LTTNG_POLL_GETNB(&events);
2909
2910 /* Inifinite blocking call, waiting for transmission */
2911restart:
2912 ret = lttng_poll_wait(&events, -1);
2913 if (ret < 0) {
2914 /*
2915 * Restart interrupted system call.
2916 */
2917 if (errno == EINTR) {
2918 goto restart;
2919 }
2920 goto error;
2921 }
2922
2923 for (i = 0; i < nb_fd; i++) {
2924 /* Fetch once the poll data */
2925 revents = LTTNG_POLL_GETEV(&events, i);
2926 pollfd = LTTNG_POLL_GETFD(&events, i);
2927
2928 /* Thread quit pipe has been closed. Killing thread. */
2929 ret = check_thread_quit_pipe(pollfd, revents);
2930 if (ret) {
139ac872
MD
2931 err = 0;
2932 goto exit;
44a5e5eb
DG
2933 }
2934
2935 /* Event on the registration socket */
2936 if (pollfd == sock) {
2937 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2938 ERR("Health socket poll error");
2939 goto error;
2940 }
2941 }
2942 }
2943
2944 new_sock = lttcomm_accept_unix_sock(sock);
2945 if (new_sock < 0) {
2946 goto error;
2947 }
2948
2949 DBG("Receiving data from client for health...");
2950 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
2951 if (ret <= 0) {
2952 DBG("Nothing recv() from client... continuing");
2953 ret = close(new_sock);
2954 if (ret) {
2955 PERROR("close");
2956 }
2957 new_sock = -1;
2958 continue;
2959 }
2960
2961 rcu_thread_online();
2962
2963 switch (msg.component) {
2964 case LTTNG_HEALTH_CMD:
2965 reply.ret_code = health_check_state(&health_thread_cmd);
2966 break;
139ac872
MD
2967 case LTTNG_HEALTH_APP_MANAGE:
2968 reply.ret_code = health_check_state(&health_thread_app_manage);
2969 break;
44a5e5eb
DG
2970 case LTTNG_HEALTH_APP_REG:
2971 reply.ret_code = health_check_state(&health_thread_app_reg);
2972 break;
2973 case LTTNG_HEALTH_KERNEL:
2974 reply.ret_code = health_check_state(&health_thread_kernel);
2975 break;
2976 case LTTNG_HEALTH_CONSUMER:
2977 reply.ret_code = check_consumer_health();
2978 break;
2979 case LTTNG_HEALTH_ALL:
44a5e5eb 2980 reply.ret_code =
139ac872
MD
2981 health_check_state(&health_thread_app_manage) &&
2982 health_check_state(&health_thread_app_reg) &&
2983 health_check_state(&health_thread_cmd) &&
2984 health_check_state(&health_thread_kernel) &&
2985 check_consumer_health();
44a5e5eb
DG
2986 break;
2987 default:
f73fabfd 2988 reply.ret_code = LTTNG_ERR_UND;
44a5e5eb
DG
2989 break;
2990 }
2991
2992 /*
2993 * Flip ret value since 0 is a success and 1 indicates a bad health for
2994 * the client where in the sessiond it is the opposite. Again, this is
2995 * just to make things easier for us poor developer which enjoy a lot
2996 * lazyness.
2997 */
2998 if (reply.ret_code == 0 || reply.ret_code == 1) {
2999 reply.ret_code = !reply.ret_code;
3000 }
3001
3002 DBG2("Health check return value %d", reply.ret_code);
3003
3004 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
3005 if (ret < 0) {
3006 ERR("Failed to send health data back to client");
3007 }
3008
3009 /* End of transmission */
3010 ret = close(new_sock);
3011 if (ret) {
3012 PERROR("close");
3013 }
3014 new_sock = -1;
3015 }
3016
139ac872 3017exit:
44a5e5eb 3018error:
139ac872
MD
3019 if (err) {
3020 ERR("Health error occurred in %s", __func__);
3021 }
44a5e5eb
DG
3022 DBG("Health check thread dying");
3023 unlink(health_unix_sock_path);
3024 if (sock >= 0) {
3025 ret = close(sock);
3026 if (ret) {
3027 PERROR("close");
3028 }
3029 }
3030 if (new_sock >= 0) {
3031 ret = close(new_sock);
3032 if (ret) {
3033 PERROR("close");
3034 }
3035 }
3036
3037 lttng_poll_clean(&events);
3038
3039 rcu_unregister_thread();
3040 return NULL;
3041}
3042
1d4b027a 3043/*
d063d709
DG
3044 * This thread manage all clients request using the unix client socket for
3045 * communication.
1d4b027a
DG
3046 */
3047static void *thread_manage_clients(void *data)
3048{
139ac872 3049 int sock = -1, ret, i, pollfd, err = -1;
53a80697 3050 int sock_error;
5eb91c98 3051 uint32_t revents, nb_fd;
273ea72c 3052 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3053 struct lttng_poll_event events;
1d4b027a
DG
3054
3055 DBG("[thread] Manage client started");
3056
8ac94142
CB
3057 testpoint(thread_manage_clients);
3058
f6a9efaa
DG
3059 rcu_register_thread();
3060
44a5e5eb
DG
3061 health_code_update(&health_thread_cmd);
3062
1d4b027a
DG
3063 ret = lttcomm_listen_unix_sock(client_sock);
3064 if (ret < 0) {
3065 goto error;
3066 }
3067
5eb91c98
DG
3068 /*
3069 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3070 * more will be added to this poll set.
3071 */
3072 ret = create_thread_poll_set(&events, 2);
3073 if (ret < 0) {
3074 goto error;
3075 }
273ea72c 3076
5eb91c98
DG
3077 /* Add the application registration socket */
3078 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3079 if (ret < 0) {
3080 goto error;
3081 }
273ea72c 3082
bbd973c2
DG
3083 /*
3084 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG
3085 */
3086 if (opt_sig_parent) {
8db8d1dc 3087 kill(ppid, SIGUSR1);
1d4b027a
DG
3088 }
3089
8ac94142
CB
3090 testpoint(thread_manage_clients_before_loop);
3091
44a5e5eb
DG
3092 health_code_update(&health_thread_cmd);
3093
1d4b027a 3094 while (1) {
1d4b027a 3095 DBG("Accepting client command ...");
273ea72c 3096
5eb91c98
DG
3097 nb_fd = LTTNG_POLL_GETNB(&events);
3098
273ea72c 3099 /* Inifinite blocking call, waiting for transmission */
88f2b785 3100 restart:
44a5e5eb 3101 health_poll_update(&health_thread_cmd);
5eb91c98 3102 ret = lttng_poll_wait(&events, -1);
44a5e5eb 3103 health_poll_update(&health_thread_cmd);
273ea72c 3104 if (ret < 0) {
88f2b785
MD
3105 /*
3106 * Restart interrupted system call.
3107 */
3108 if (errno == EINTR) {
3109 goto restart;
3110 }
273ea72c
DG
3111 goto error;
3112 }
3113
5eb91c98
DG
3114 for (i = 0; i < nb_fd; i++) {
3115 /* Fetch once the poll data */
3116 revents = LTTNG_POLL_GETEV(&events, i);
3117 pollfd = LTTNG_POLL_GETFD(&events, i);
3118
44a5e5eb
DG
3119 health_code_update(&health_thread_cmd);
3120
5eb91c98
DG
3121 /* Thread quit pipe has been closed. Killing thread. */
3122 ret = check_thread_quit_pipe(pollfd, revents);
3123 if (ret) {
139ac872
MD
3124 err = 0;
3125 goto exit;
5eb91c98
DG
3126 }
3127
3128 /* Event on the registration socket */
3129 if (pollfd == client_sock) {
3130 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3131 ERR("Client socket poll error");
3132 goto error;
3133 }
3134 }
3135 }
3136
3137 DBG("Wait for client response");
3138
44a5