Move UST registry into sessiond and implement notifiers
[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>
d27c42b8 40#include <common/compat/socket.h>
db758600
DG
41#include <common/defaults.h>
42#include <common/kernel-consumer/kernel-consumer.h>
50c8f484 43#include <common/futex.h>
00e2e675 44#include <common/relayd/relayd.h>
81b86775 45#include <common/utils.h>
fac6795d 46
10a8a223 47#include "lttng-sessiond.h"
54d01ffb 48#include "channel.h"
2f77fc4b 49#include "cmd.h"
00e2e675 50#include "consumer.h"
099e26bd 51#include "context.h"
54d01ffb 52#include "event.h"
4771f025 53#include "kernel.h"
f1e16794 54#include "kernel-consumer.h"
096102bd 55#include "modprobe.h"
0fdd1e2c 56#include "shm.h"
1e307fab 57#include "ust-ctl.h"
00e2e675 58#include "ust-consumer.h"
8e68d1c8 59#include "utils.h"
4063050c 60#include "fd-limit.h"
44a5e5eb 61#include "health.h"
8ac94142 62#include "testpoint.h"
d0b96690 63#include "ust-thread.h"
fac6795d 64
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MD
65#define CONSUMERD_FILE "lttng-consumerd"
66
75462a81 67/* Const values */
bbccc3d2 68const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab 69
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DG
70const char *progname;
71const char *opt_tracing_group;
35f90c40 72static const char *opt_pidfile;
5b8719f5 73static int opt_sig_parent;
97e19046 74static int opt_verbose_consumer;
fac6795d 75static int opt_daemon;
4fba7219 76static int opt_no_kernel;
fac6795d 77static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 78static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 79static char *rundir;
3bd1e081 80
a23ec3a7
DG
81/*
82 * Consumer daemon specific control data. Every value not initialized here is
83 * set to 0 by the static definition.
84 */
3bd1e081
MD
85static struct consumer_data kconsumer_data = {
86 .type = LTTNG_CONSUMER_KERNEL,
60922cb0
DG
87 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
88 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
03550b58
MD
89 .err_sock = -1,
90 .cmd_sock = -1,
173af62f
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91 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
92 .lock = PTHREAD_MUTEX_INITIALIZER,
a23ec3a7
DG
93 .cond = PTHREAD_COND_INITIALIZER,
94 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
3bd1e081 95};
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MD
96static struct consumer_data ustconsumer64_data = {
97 .type = LTTNG_CONSUMER64_UST,
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DG
98 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
99 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
03550b58
MD
100 .err_sock = -1,
101 .cmd_sock = -1,
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102 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
103 .lock = PTHREAD_MUTEX_INITIALIZER,
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104 .cond = PTHREAD_COND_INITIALIZER,
105 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
7753dea8
MD
106};
107static struct consumer_data ustconsumer32_data = {
108 .type = LTTNG_CONSUMER32_UST,
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109 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
110 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
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MD
111 .err_sock = -1,
112 .cmd_sock = -1,
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113 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
114 .lock = PTHREAD_MUTEX_INITIALIZER,
a23ec3a7
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115 .cond = PTHREAD_COND_INITIALIZER,
116 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
3bd1e081
MD
117};
118
26c9d55e 119/* Shared between threads */
099e26bd 120static int dispatch_thread_exit;
fac6795d 121
54d01ffb
DG
122/* Global application Unix socket path */
123static char apps_unix_sock_path[PATH_MAX];
124/* Global client Unix socket path */
125static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG
126/* global wait shm path for UST */
127static char wait_shm_path[PATH_MAX];
44a5e5eb
DG
128/* Global health check unix path */
129static char health_unix_sock_path[PATH_MAX];
fac6795d 130
1d4b027a 131/* Sockets and FDs */
a4b35e07
MD
132static int client_sock = -1;
133static int apps_sock = -1;
2f77fc4b 134int kernel_tracer_fd = -1;
76d7553f 135static int kernel_poll_pipe[2] = { -1, -1 };
1d4b027a 136
273ea72c
DG
137/*
138 * Quit pipe for all threads. This permits a single cancellation point
139 * for all threads when receiving an event on the pipe.
140 */
76d7553f 141static int thread_quit_pipe[2] = { -1, -1 };
273ea72c 142
099e26bd
DG
143/*
144 * This pipe is used to inform the thread managing application communication
145 * that a command is queued and ready to be processed.
146 */
76d7553f 147static int apps_cmd_pipe[2] = { -1, -1 };
099e26bd 148
d0b96690
DG
149int apps_cmd_notify_pipe[2] = { -1, -1 };
150
1d4b027a 151/* Pthread, Mutexes and Semaphores */
1d4b027a 152static pthread_t apps_thread;
d0b96690 153static pthread_t apps_notify_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
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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
ae9e45b3
DG
225/*
226 * Socket timeout for receiving and sending in seconds.
227 */
228static int app_socket_timeout;
229
fb09408a 230static
7753dea8 231void setup_consumerd_path(void)
fb09408a 232{
fc7a59ce 233 const char *bin, *libdir;
fb09408a 234
7753dea8
MD
235 /*
236 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD
237 * native architecture size consumer if CONFIG_CONSUMER*_PATH
238 * has not been defined.
7753dea8 239 */
ebaeda94 240#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM
241 if (!consumerd32_bin[0]) {
242 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD
243 }
244 if (!consumerd32_libdir[0]) {
245 consumerd32_libdir = INSTALL_LIB_PATH;
246 }
247#elif (CAA_BITS_PER_LONG == 64)
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AM
248 if (!consumerd64_bin[0]) {
249 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 250 }
ebaeda94
MD
251 if (!consumerd64_libdir[0]) {
252 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD
253 }
254#else
255#error "Unknown bitness"
256#endif
257
fb09408a
MD
258 /*
259 * runtime env. var. overrides the build default.
260 */
fc7a59ce
AM
261 bin = getenv("LTTNG_CONSUMERD32_BIN");
262 if (bin) {
263 consumerd32_bin = bin;
7753dea8 264 }
fc7a59ce
AM
265 bin = getenv("LTTNG_CONSUMERD64_BIN");
266 if (bin) {
267 consumerd64_bin = bin;
ebaeda94 268 }
72f579ee 269 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
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MD
270 if (libdir) {
271 consumerd32_libdir = libdir;
272 }
72f579ee 273 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD
274 if (libdir) {
275 consumerd64_libdir = libdir;
fb09408a
MD
276 }
277}
278
5eb91c98
DG
279/*
280 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
281 */
d0b96690 282int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
5eb91c98
DG
283{
284 int ret;
285
d0b96690 286 assert(events);
5eb91c98
DG
287
288 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
289 if (ret < 0) {
290 goto error;
291 }
292
293 /* Add quit pipe */
d0b96690 294 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
5eb91c98
DG
295 if (ret < 0) {
296 goto error;
297 }
298
299 return 0;
300
301error:
302 return ret;
303}
304
305/*
306 * Check if the thread quit pipe was triggered.
307 *
308 * Return 1 if it was triggered else 0;
309 */
d0b96690 310int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
5eb91c98
DG
311{
312 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
313 return 1;
314 }
315
316 return 0;
317}
318
0fdd1e2c
DG
319/*
320 * Return group ID of the tracing group or -1 if not found.
321 */
996b65c8
MD
322static gid_t allowed_group(void)
323{
324 struct group *grp;
325
274e143b
MD
326 if (opt_tracing_group) {
327 grp = getgrnam(opt_tracing_group);
328 } else {
329 grp = getgrnam(default_tracing_group);
330 }
996b65c8
MD
331 if (!grp) {
332 return -1;
333 } else {
334 return grp->gr_gid;
335 }
336}
337
273ea72c 338/*
5eb91c98 339 * Init thread quit pipe.
273ea72c
DG
340 *
341 * Return -1 on error or 0 if all pipes are created.
342 */
343static int init_thread_quit_pipe(void)
344{
730389d9 345 int ret, i;
273ea72c 346
730389d9 347 ret = pipe(thread_quit_pipe);
273ea72c 348 if (ret < 0) {
730389d9 349 PERROR("thread quit pipe");
273ea72c
DG
350 goto error;
351 }
352
730389d9
DG
353 for (i = 0; i < 2; i++) {
354 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
355 if (ret < 0) {
356 PERROR("fcntl");
357 goto error;
358 }
359 }
360
273ea72c
DG
361error:
362 return ret;
363}
364
099e26bd
DG
365/*
366 * Stop all threads by closing the thread quit pipe.
367 */
cf3af59e
MD
368static void stop_threads(void)
369{
5eb91c98
DG
370 int ret;
371
cf3af59e
MD
372 /* Stopping all threads */
373 DBG("Terminating all threads");
54d01ffb 374 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
375 if (ret < 0) {
376 ERR("write error on thread quit pipe");
377 }
378
099e26bd 379 /* Dispatch thread */
26c9d55e 380 CMM_STORE_SHARED(dispatch_thread_exit, 1);
099e26bd 381 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
382}
383
fac6795d 384/*
d063d709 385 * Cleanup the daemon
fac6795d 386 */
cf3af59e 387static void cleanup(void)
fac6795d 388{
ef599319 389 int ret;
6620da75 390 char *cmd = NULL;
af9737e9 391 struct ltt_session *sess, *stmp;
fac6795d 392
1d4b027a 393 DBG("Cleaning up");
e07ae692 394
2f77fc4b
DG
395 /* First thing first, stop all threads */
396 utils_close_pipe(thread_quit_pipe);
397
35f90c40
DG
398 /*
399 * If opt_pidfile is undefined, the default file will be wiped when
400 * removing the rundir.
401 */
402 if (opt_pidfile) {
403 ret = remove(opt_pidfile);
404 if (ret < 0) {
405 PERROR("remove pidfile %s", opt_pidfile);
406 }
407 }
408
67e40797
DG
409 DBG("Removing %s directory", rundir);
410 ret = asprintf(&cmd, "rm -rf %s", rundir);
411 if (ret < 0) {
412 ERR("asprintf failed. Something is really wrong!");
413 }
5461b305 414
67e40797
DG
415 /* Remove lttng run directory */
416 ret = system(cmd);
417 if (ret < 0) {
418 ERR("Unable to clean %s", rundir);
1d4b027a 419 }
67e40797 420 free(cmd);
bd69add2 421 free(rundir);
5461b305 422
99bab54f 423 DBG("Cleaning up all sessions");
fac6795d 424
b5541356 425 /* Destroy session list mutex */
273ea72c
DG
426 if (session_list_ptr != NULL) {
427 pthread_mutex_destroy(&session_list_ptr->lock);
428
429 /* Cleanup ALL session */
54d01ffb
DG
430 cds_list_for_each_entry_safe(sess, stmp,
431 &session_list_ptr->head, list) {
2f77fc4b 432 cmd_destroy_session(sess, kernel_poll_pipe[1]);
273ea72c
DG
433 }
434 }
435
099e26bd 436 DBG("Closing all UST sockets");
56fff090 437 ust_app_clean_list();
099e26bd 438
4fba7219
DG
439 if (is_root && !opt_no_kernel) {
440 DBG2("Closing kernel fd");
a4b35e07 441 if (kernel_tracer_fd >= 0) {
76d7553f
MD
442 ret = close(kernel_tracer_fd);
443 if (ret) {
444 PERROR("close");
445 }
a4b35e07 446 }
2f50c8a3 447 DBG("Unloading kernel modules");
096102bd 448 modprobe_remove_lttng_all();
2f50c8a3 449 }
2f77fc4b 450
421cb601 451 /* <fun> */
f56a39af 452 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
453 "Matthew, BEET driven development works!%c[%dm",
454 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
455 /* </fun> */
fac6795d
DG
456}
457
e065084a 458/*
d063d709 459 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 460 *
d063d709 461 * Return lttcomm error code.
e065084a
DG
462 */
463static int send_unix_sock(int sock, void *buf, size_t len)
464{
465 /* Check valid length */
c617c0c6 466 if (len == 0) {
e065084a
DG
467 return -1;
468 }
469
470 return lttcomm_send_unix_sock(sock, buf, len);
471}
472
5461b305 473/*
d063d709 474 * Free memory of a command context structure.
5461b305 475 */
a2fb29a5 476static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 477{
a2fb29a5
DG
478 DBG("Clean command context structure");
479 if (*cmd_ctx) {
480 if ((*cmd_ctx)->llm) {
481 free((*cmd_ctx)->llm);
5461b305 482 }
a2fb29a5
DG
483 if ((*cmd_ctx)->lsm) {
484 free((*cmd_ctx)->lsm);
5461b305 485 }
a2fb29a5
DG
486 free(*cmd_ctx);
487 *cmd_ctx = NULL;
5461b305
DG
488 }
489}
490
fac6795d 491/*
0fdd1e2c 492 * Notify UST applications using the shm mmap futex.
fac6795d 493 */
0fdd1e2c 494static int notify_ust_apps(int active)
fac6795d 495{
0fdd1e2c 496 char *wait_shm_mmap;
fac6795d 497
0fdd1e2c 498 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 499
0fdd1e2c
DG
500 /* See shm.c for this call implying mmap, shm and futex calls */
501 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
502 if (wait_shm_mmap == NULL) {
fac6795d
DG
503 goto error;
504 }
505
0fdd1e2c
DG
506 /* Wake waiting process */
507 futex_wait_update((int32_t *) wait_shm_mmap, active);
508
509 /* Apps notified successfully */
510 return 0;
fac6795d
DG
511
512error:
0fdd1e2c 513 return -1;
fac6795d
DG
514}
515
e065084a 516/*
d063d709
DG
517 * Setup the outgoing data buffer for the response (llm) by allocating the
518 * right amount of memory and copying the original information from the lsm
519 * structure.
ca95a216 520 *
d063d709 521 * Return total size of the buffer pointed by buf.
ca95a216 522 */
5461b305 523static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 524{
f3ed775e 525 int ret, buf_size;
ca95a216 526
f3ed775e 527 buf_size = size;
5461b305 528
ba7f0ae5 529 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 530 if (cmd_ctx->llm == NULL) {
76d7553f 531 PERROR("zmalloc");
5461b305 532 ret = -ENOMEM;
ca95a216
DG
533 goto error;
534 }
535
5461b305
DG
536 /* Copy common data */
537 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 538 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 539
5461b305
DG
540 cmd_ctx->llm->data_size = size;
541 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
542
ca95a216
DG
543 return buf_size;
544
545error:
546 return ret;
547}
548
7a485870 549/*
5eb91c98 550 * Update the kernel poll set of all channel fd available over all tracing
d063d709 551 * session. Add the wakeup pipe at the end of the set.
7a485870 552 */
5eb91c98 553static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 554{
5eb91c98 555 int ret;
7a485870
DG
556 struct ltt_session *session;
557 struct ltt_kernel_channel *channel;
558
5eb91c98 559 DBG("Updating kernel poll set");
7a485870 560
54d01ffb 561 session_lock_list();
b5541356 562 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 563 session_lock(session);
7a485870 564 if (session->kernel_session == NULL) {
54d01ffb 565 session_unlock(session);
7a485870
DG
566 continue;
567 }
7a485870 568
54d01ffb
DG
569 cds_list_for_each_entry(channel,
570 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
571 /* Add channel fd to the kernel poll set */
572 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
573 if (ret < 0) {
54d01ffb 574 session_unlock(session);
5eb91c98
DG
575 goto error;
576 }
577 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 578 }
54d01ffb 579 session_unlock(session);
7a485870 580 }
54d01ffb 581 session_unlock_list();
7a485870 582
5eb91c98 583 return 0;
7a485870
DG
584
585error:
54d01ffb 586 session_unlock_list();
7a485870
DG
587 return -1;
588}
589
590/*
54d01ffb 591 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 592 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 593 *
d063d709 594 * Useful for CPU hotplug feature.
7a485870 595 */
2bdd86d4 596static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
597{
598 int ret = 0;
599 struct ltt_session *session;
173af62f 600 struct ltt_kernel_session *ksess;
7a485870
DG
601 struct ltt_kernel_channel *channel;
602
603 DBG("Updating kernel streams for channel fd %d", fd);
604
54d01ffb 605 session_lock_list();
b5541356 606 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 607 session_lock(session);
7a485870 608 if (session->kernel_session == NULL) {
54d01ffb 609 session_unlock(session);
7a485870
DG
610 continue;
611 }
173af62f 612 ksess = session->kernel_session;
d9800920 613
173af62f 614 cds_list_for_each_entry(channel, &ksess->channel_list.head, list) {
7a485870
DG
615 if (channel->fd == fd) {
616 DBG("Channel found, updating kernel streams");
617 ret = kernel_open_channel_stream(channel);
618 if (ret < 0) {
b3c750d2 619 goto error;
7a485870 620 }
d9800920 621
7a485870 622 /*
5eb91c98
DG
623 * Have we already sent fds to the consumer? If yes, it means
624 * that tracing is started so it is safe to send our updated
625 * stream fds.
7a485870 626 */
173af62f
DG
627 if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) {
628 struct lttng_ht_iter iter;
629 struct consumer_socket *socket;
630
e7fe706f 631 rcu_read_lock();
173af62f
DG
632 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
633 &iter.iter, socket, node.node) {
634 /* Code flow error */
635 assert(socket->fd >= 0);
636
637 pthread_mutex_lock(socket->lock);
f50f23d9 638 ret = kernel_consumer_send_channel_stream(socket,
173af62f
DG
639 channel, ksess);
640 pthread_mutex_unlock(socket->lock);
641 if (ret < 0) {
e7fe706f 642 rcu_read_unlock();
173af62f
DG
643 goto error;
644 }
7a485870 645 }
e7fe706f 646 rcu_read_unlock();
7a485870 647 }
b3c750d2 648 goto error;
7a485870
DG
649 }
650 }
54d01ffb 651 session_unlock(session);
7a485870 652 }
54d01ffb 653 session_unlock_list();
b3c750d2 654 return ret;
7a485870 655
b3c750d2 656error:
54d01ffb
DG
657 session_unlock(session);
658 session_unlock_list();
7a485870
DG
659 return ret;
660}
661
487cf67c 662/*
ffe60014
DG
663 * For each tracing session, update newly registered apps. The session list
664 * lock MUST be acquired before calling this.
487cf67c
DG
665 */
666static void update_ust_app(int app_sock)
667{
668 struct ltt_session *sess, *stmp;
669
670 /* For all tracing session(s) */
671 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 672 session_lock(sess);
421cb601
DG
673 if (sess->ust_session) {
674 ust_app_global_update(sess->ust_session, app_sock);
675 }
4ee14516 676 session_unlock(sess);
487cf67c
DG
677 }
678}
679
7a485870 680/*
d063d709 681 * This thread manage event coming from the kernel.
7a485870 682 *
d063d709
DG
683 * Features supported in this thread:
684 * -) CPU Hotplug
7a485870
DG
685 */
686static void *thread_manage_kernel(void *data)
687{
139ac872 688 int ret, i, pollfd, update_poll_flag = 1, err = -1;
5eb91c98 689 uint32_t revents, nb_fd;
7a485870 690 char tmp;
5eb91c98 691 struct lttng_poll_event events;
7a485870 692
6993eeb3 693 DBG("[thread] Thread manage kernel started");
7a485870 694
927ca06a
DG
695 health_register(HEALTH_TYPE_KERNEL);
696
d5d63bf1
DG
697 /*
698 * This first step of the while is to clean this structure which could free
699 * non NULL pointers so zero it before the loop.
700 */
701 memset(&events, 0, sizeof(events));
702
6993eeb3
CB
703 if (testpoint(thread_manage_kernel)) {
704 goto error_testpoint;
705 }
8ac94142 706
840cb59c 707 health_code_update();
44a5e5eb 708
6993eeb3 709 if (testpoint(thread_manage_kernel_before_loop)) {
d21b0d71 710 goto error_testpoint;
6993eeb3
CB
711 }
712
7a485870 713 while (1) {
840cb59c 714 health_code_update();
44a5e5eb 715
7a485870 716 if (update_poll_flag == 1) {
d21b0d71
DG
717 /* Clean events object. We are about to populate it again. */
718 lttng_poll_clean(&events);
719
d0b96690 720 ret = sessiond_set_thread_pollset(&events, 2);
d21b0d71
DG
721 if (ret < 0) {
722 goto error_poll_create;
723 }
724
725 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
726 if (ret < 0) {
727 goto error;
728 }
5f822d0a 729
d21b0d71 730 /* This will add the available kernel channel if any. */
5eb91c98
DG
731 ret = update_kernel_poll(&events);
732 if (ret < 0) {
7a485870
DG
733 goto error;
734 }
735 update_poll_flag = 0;
736 }
737
d21b0d71 738 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events));
7a485870
DG
739
740 /* Poll infinite value of time */
88f2b785 741 restart:
a78af745 742 health_poll_entry();
5eb91c98 743 ret = lttng_poll_wait(&events, -1);
a78af745 744 health_poll_exit();
7a485870 745 if (ret < 0) {
88f2b785
MD
746 /*
747 * Restart interrupted system call.
748 */
749 if (errno == EINTR) {
750 goto restart;
751 }
7a485870
DG
752 goto error;
753 } else if (ret == 0) {
754 /* Should not happen since timeout is infinite */
85611738
DG
755 ERR("Return value of poll is 0 with an infinite timeout.\n"
756 "This should not have happened! Continuing...");
7a485870
DG
757 continue;
758 }
759
0d9c5d77
DG
760 nb_fd = ret;
761
5eb91c98
DG
762 for (i = 0; i < nb_fd; i++) {
763 /* Fetch once the poll data */
764 revents = LTTNG_POLL_GETEV(&events, i);
765 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 766
840cb59c 767 health_code_update();
44a5e5eb 768
5eb91c98 769 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 770 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 771 if (ret) {
139ac872
MD
772 err = 0;
773 goto exit;
5eb91c98 774 }
7a485870 775
5eb91c98
DG
776 /* Check for data on kernel pipe */
777 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
f921c78f
DG
778 do {
779 ret = read(kernel_poll_pipe[0], &tmp, 1);
780 } while (ret < 0 && errno == EINTR);
781 /*
782 * Ret value is useless here, if this pipe gets any actions an
783 * update is required anyway.
784 */
5eb91c98
DG
785 update_poll_flag = 1;
786 continue;
787 } else {
788 /*
789 * New CPU detected by the kernel. Adding kernel stream to
790 * kernel session and updating the kernel consumer
791 */
792 if (revents & LPOLLIN) {
2bdd86d4 793 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
794 if (ret < 0) {
795 continue;
796 }
797 break;
798 /*
799 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
800 * and unregister kernel stream at this point.
801 */
7a485870 802 }
7a485870
DG
803 }
804 }
805 }
806
139ac872 807exit:
7a485870 808error:
5eb91c98 809 lttng_poll_clean(&events);
76d7553f 810error_poll_create:
6993eeb3 811error_testpoint:
6620da75
DG
812 utils_close_pipe(kernel_poll_pipe);
813 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
139ac872 814 if (err) {
840cb59c 815 health_error();
139ac872 816 ERR("Health error occurred in %s", __func__);
6620da75
DG
817 WARN("Kernel thread died unexpectedly. "
818 "Kernel tracing can continue but CPU hotplug is disabled.");
139ac872 819 }
927ca06a 820 health_unregister();
76d7553f 821 DBG("Kernel thread dying");
7a485870
DG
822 return NULL;
823}
824
a23ec3a7
DG
825/*
826 * Signal pthread condition of the consumer data that the thread.
827 */
828static void signal_consumer_condition(struct consumer_data *data, int state)
829{
830 pthread_mutex_lock(&data->cond_mutex);
831
832 /*
833 * The state is set before signaling. It can be any value, it's the waiter
834 * job to correctly interpret this condition variable associated to the
835 * consumer pthread_cond.
836 *
837 * A value of 0 means that the corresponding thread of the consumer data
838 * was not started. 1 indicates that the thread has started and is ready
839 * for action. A negative value means that there was an error during the
840 * thread bootstrap.
841 */
842 data->consumer_thread_is_ready = state;
843 (void) pthread_cond_signal(&data->cond);
844
845 pthread_mutex_unlock(&data->cond_mutex);
846}
847
1d4b027a 848/*
3bd1e081 849 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 850 */
3bd1e081 851static void *thread_manage_consumer(void *data)
1d4b027a 852{
139ac872 853 int sock = -1, i, ret, pollfd, err = -1;
5eb91c98 854 uint32_t revents, nb_fd;
1d4b027a 855 enum lttcomm_return_code code;
5eb91c98 856 struct lttng_poll_event events;
3bd1e081 857 struct consumer_data *consumer_data = data;
1d4b027a 858
3bd1e081 859 DBG("[thread] Manage consumer started");
1d4b027a 860
927ca06a
DG
861 health_register(HEALTH_TYPE_CONSUMER);
862
855060f8 863 health_code_update();
9449cc75 864
5eb91c98
DG
865 /*
866 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
867 * Nothing more will be added to this poll set.
868 */
d0b96690 869 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 870 if (ret < 0) {
76d7553f 871 goto error_poll;
5eb91c98 872 }
273ea72c 873
edb8b045
DG
874 /*
875 * The error socket here is already in a listening state which was done
876 * just before spawning this thread to avoid a race between the consumer
877 * daemon exec trying to connect and the listen() call.
878 */
3bd1e081 879 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
880 if (ret < 0) {
881 goto error;
882 }
883
840cb59c 884 health_code_update();
44a5e5eb 885
273ea72c 886 /* Inifinite blocking call, waiting for transmission */
88f2b785 887restart:
a78af745 888 health_poll_entry();
8ac94142 889
6993eeb3
CB
890 if (testpoint(thread_manage_consumer)) {
891 goto error;
892 }
8ac94142 893
5eb91c98 894 ret = lttng_poll_wait(&events, -1);
a78af745 895 health_poll_exit();
273ea72c 896 if (ret < 0) {
88f2b785
MD
897 /*
898 * Restart interrupted system call.
899 */
900 if (errno == EINTR) {
901 goto restart;
902 }
273ea72c
DG
903 goto error;
904 }
905
0d9c5d77
DG
906 nb_fd = ret;
907
5eb91c98
DG
908 for (i = 0; i < nb_fd; i++) {
909 /* Fetch once the poll data */
910 revents = LTTNG_POLL_GETEV(&events, i);
911 pollfd = LTTNG_POLL_GETFD(&events, i);
912
840cb59c 913 health_code_update();
44a5e5eb 914
5eb91c98 915 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 916 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 917 if (ret) {
139ac872
MD
918 err = 0;
919 goto exit;
5eb91c98
DG
920 }
921
922 /* Event on the registration socket */
3bd1e081 923 if (pollfd == consumer_data->err_sock) {
5eb91c98 924 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 925 ERR("consumer err socket poll error");
5eb91c98
DG
926 goto error;
927 }
928 }
273ea72c
DG
929 }
930
3bd1e081 931 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
932 if (sock < 0) {
933 goto error;
934 }
935
b662582b
DG
936 /*
937 * Set the CLOEXEC flag. Return code is useless because either way, the
938 * show must go on.
939 */
940 (void) utils_set_fd_cloexec(sock);
941
840cb59c 942 health_code_update();
44a5e5eb 943
3bd1e081 944 DBG2("Receiving code from consumer err_sock");
ee0b0061 945
712ea556 946 /* Getting status code from kconsumerd */
54d01ffb
DG
947 ret = lttcomm_recv_unix_sock(sock, &code,
948 sizeof(enum lttcomm_return_code));
1d4b027a
DG
949 if (ret <= 0) {
950 goto error;
951 }
952
840cb59c 953 health_code_update();
44a5e5eb 954
f73fabfd 955 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
3bd1e081
MD
956 consumer_data->cmd_sock =
957 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
958 if (consumer_data->cmd_sock < 0) {
a23ec3a7
DG
959 /* On error, signal condition and quit. */
960 signal_consumer_condition(consumer_data, -1);
48842b30 961 PERROR("consumer connect");
1d4b027a
DG
962 goto error;
963 }
a23ec3a7
DG
964 signal_consumer_condition(consumer_data, 1);
965 DBG("Consumer command socket ready");
1d4b027a 966 } else {
3bd1e081 967 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
968 lttcomm_get_readable_code(-code));
969 goto error;
970 }
971
54d01ffb 972 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 973 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 974 if (ret < 0) {
72079cae
DG
975 goto error;
976 }
977
5eb91c98
DG
978 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
979 if (ret < 0) {
72079cae 980 goto error;
5eb91c98
DG
981 }
982
840cb59c 983 health_code_update();
44a5e5eb 984
5eb91c98 985 /* Inifinite blocking call, waiting for transmission */
88f2b785 986restart_poll:
a78af745 987 health_poll_entry();
5eb91c98 988 ret = lttng_poll_wait(&events, -1);
a78af745 989 health_poll_exit();
5eb91c98 990 if (ret < 0) {
88f2b785
MD
991 /*
992 * Restart interrupted system call.
993 */
994 if (errno == EINTR) {
995 goto restart_poll;
996 }
72079cae
DG
997 goto error;
998 }
999
0d9c5d77
DG
1000 nb_fd = ret;
1001
5eb91c98
DG
1002 for (i = 0; i < nb_fd; i++) {
1003 /* Fetch once the poll data */
1004 revents = LTTNG_POLL_GETEV(&events, i);
1005 pollfd = LTTNG_POLL_GETFD(&events, i);
1006
840cb59c 1007 health_code_update();
44a5e5eb 1008
5eb91c98 1009 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 1010 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1011 if (ret) {
139ac872
MD
1012 err = 0;
1013 goto exit;
5eb91c98
DG
1014 }
1015
1016 /* Event on the kconsumerd socket */
1017 if (pollfd == sock) {
1018 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1019 ERR("consumer err socket second poll error");
5eb91c98
DG
1020 goto error;
1021 }
1022 }
1023 }
1024
840cb59c 1025 health_code_update();
44a5e5eb 1026
712ea556 1027 /* Wait for any kconsumerd error */
54d01ffb
DG
1028 ret = lttcomm_recv_unix_sock(sock, &code,
1029 sizeof(enum lttcomm_return_code));
712ea556 1030 if (ret <= 0) {
3bd1e081 1031 ERR("consumer closed the command socket");
712ea556 1032 goto error;
6f61d021 1033 }
1d4b027a 1034
3bd1e081 1035 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1036
139ac872 1037exit:
1d4b027a 1038error:
5c827ce0
DG
1039 /* Immediately set the consumerd state to stopped */
1040 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1041 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1042 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1043 consumer_data->type == LTTNG_CONSUMER32_UST) {
1044 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1045 } else {
1046 /* Code flow error... */
1047 assert(0);
1048 }
1049
76d7553f
MD
1050 if (consumer_data->err_sock >= 0) {
1051 ret = close(consumer_data->err_sock);
1052 if (ret) {
1053 PERROR("close");
1054 }
1055 }
1056 if (consumer_data->cmd_sock >= 0) {
1057 ret = close(consumer_data->cmd_sock);
1058 if (ret) {
1059 PERROR("close");
1060 }
1061 }
1062 if (sock >= 0) {
1063 ret = close(sock);
1064 if (ret) {
1065 PERROR("close");
1066 }
1067 }
273ea72c 1068
3bd1e081
MD
1069 unlink(consumer_data->err_unix_sock_path);
1070 unlink(consumer_data->cmd_unix_sock_path);
1071 consumer_data->pid = 0;
1d4b027a 1072
5eb91c98 1073 lttng_poll_clean(&events);
76d7553f 1074error_poll:
139ac872 1075 if (err) {
840cb59c 1076 health_error();
139ac872
MD
1077 ERR("Health error occurred in %s", __func__);
1078 }
927ca06a 1079 health_unregister();
76d7553f 1080 DBG("consumer thread cleanup completed");
0177d773 1081
5eb91c98 1082 return NULL;
099e26bd
DG
1083}
1084
099e26bd
DG
1085/*
1086 * This thread manage application communication.
1d4b027a
DG
1087 */
1088static void *thread_manage_apps(void *data)
099e26bd 1089{
139ac872 1090 int i, ret, pollfd, err = -1;
5eb91c98 1091 uint32_t revents, nb_fd;
5eb91c98 1092 struct lttng_poll_event events;
099e26bd
DG
1093
1094 DBG("[thread] Manage application started");
1095
f6a9efaa
DG
1096 rcu_register_thread();
1097 rcu_thread_online();
1098
927ca06a
DG
1099 health_register(HEALTH_TYPE_APP_MANAGE);
1100
6993eeb3
CB
1101 if (testpoint(thread_manage_apps)) {
1102 goto error_testpoint;
1103 }
1104
840cb59c 1105 health_code_update();
44a5e5eb 1106
d0b96690 1107 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 1108 if (ret < 0) {
76d7553f 1109 goto error_poll_create;
5eb91c98 1110 }
099e26bd 1111
5eb91c98
DG
1112 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1113 if (ret < 0) {
1114 goto error;
1115 }
099e26bd 1116
6993eeb3
CB
1117 if (testpoint(thread_manage_apps_before_loop)) {
1118 goto error;
1119 }
8ac94142 1120
840cb59c 1121 health_code_update();
44a5e5eb 1122
5eb91c98 1123 while (1) {
d21b0d71 1124 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events));
099e26bd
DG
1125
1126 /* Inifinite blocking call, waiting for transmission */
88f2b785 1127 restart:
a78af745 1128 health_poll_entry();
5eb91c98 1129 ret = lttng_poll_wait(&events, -1);
a78af745 1130 health_poll_exit();
099e26bd 1131 if (ret < 0) {
88f2b785
MD
1132 /*
1133 * Restart interrupted system call.
1134 */
1135 if (errno == EINTR) {
1136 goto restart;
1137 }
099e26bd
DG
1138 goto error;
1139 }
1140
0d9c5d77
DG
1141 nb_fd = ret;
1142
5eb91c98
DG
1143 for (i = 0; i < nb_fd; i++) {
1144 /* Fetch once the poll data */
1145 revents = LTTNG_POLL_GETEV(&events, i);
1146 pollfd = LTTNG_POLL_GETFD(&events, i);
1147
840cb59c 1148 health_code_update();
44a5e5eb 1149
5eb91c98 1150 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 1151 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1152 if (ret) {
139ac872
MD
1153 err = 0;
1154 goto exit;
5eb91c98 1155 }
099e26bd 1156
5eb91c98
DG
1157 /* Inspect the apps cmd pipe */
1158 if (pollfd == apps_cmd_pipe[0]) {
1159 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1160 ERR("Apps command pipe error");
0177d773 1161 goto error;
5eb91c98 1162 } else if (revents & LPOLLIN) {
d0b96690
DG
1163 int sock;
1164
5eb91c98 1165 /* Empty pipe */
f921c78f 1166 do {
d0b96690 1167 ret = read(apps_cmd_pipe[0], &sock, sizeof(sock));
f921c78f 1168 } while (ret < 0 && errno == EINTR);
d0b96690 1169 if (ret < 0 || ret < sizeof(sock)) {
76d7553f 1170 PERROR("read apps cmd pipe");
5eb91c98
DG
1171 goto error;
1172 }
099e26bd 1173
840cb59c 1174 health_code_update();
44a5e5eb 1175
ffe60014 1176 /*
d0b96690
DG
1177 * We only monitor the error events of the socket. This
1178 * thread does not handle any incoming data from UST
1179 * (POLLIN).
ffe60014 1180 */
d0b96690
DG
1181 ret = lttng_poll_add(&events, sock,
1182 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1183 if (ret < 0) {
5eb91c98 1184 goto error;
e0c7ec2b 1185 }
acc7b41b 1186
d0b96690
DG
1187 /* Set socket timeout for both receiving and ending */
1188 (void) lttcomm_setsockopt_rcv_timeout(sock,
1189 app_socket_timeout);
1190 (void) lttcomm_setsockopt_snd_timeout(sock,
1191 app_socket_timeout);
ae9e45b3 1192
d0b96690 1193 DBG("Apps with sock %d added to poll set", sock);
487cf67c 1194
840cb59c 1195 health_code_update();
44a5e5eb 1196
5eb91c98 1197 break;
0177d773 1198 }
5eb91c98
DG
1199 } else {
1200 /*
54d01ffb
DG
1201 * At this point, we know that a registered application made
1202 * the event at poll_wait.
5eb91c98
DG
1203 */
1204 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1205 /* Removing from the poll set */
1206 ret = lttng_poll_del(&events, pollfd);
1207 if (ret < 0) {
1208 goto error;
1209 }
099e26bd 1210
b9d9b220 1211 /* Socket closed on remote end. */
56fff090 1212 ust_app_unregister(pollfd);
5eb91c98
DG
1213 break;
1214 }
099e26bd 1215 }
44a5e5eb 1216
840cb59c 1217 health_code_update();
099e26bd 1218 }
099e26bd
DG
1219 }
1220
139ac872 1221exit:
099e26bd 1222error:
5eb91c98 1223 lttng_poll_clean(&events);
76d7553f 1224error_poll_create:
6993eeb3 1225error_testpoint:
6620da75
DG
1226 utils_close_pipe(apps_cmd_pipe);
1227 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1228
1229 /*
1230 * We don't clean the UST app hash table here since already registered
1231 * applications can still be controlled so let them be until the session
1232 * daemon dies or the applications stop.
1233 */
1234
139ac872 1235 if (err) {
840cb59c 1236 health_error();
139ac872
MD
1237 ERR("Health error occurred in %s", __func__);
1238 }
927ca06a 1239 health_unregister();
76d7553f 1240 DBG("Application communication apps thread cleanup complete");
f6a9efaa
DG
1241 rcu_thread_offline();
1242 rcu_unregister_thread();
099e26bd
DG
1243 return NULL;
1244}
1245
d0b96690
DG
1246/*
1247 * Send the application sockets (cmd and notify) to the respective threads.
1248 * This is called from the dispatch UST registration thread once all sockets
1249 * are set for the application.
1250 *
1251 * On success, return 0 else a negative value being the errno message of the
1252 * write().
1253 */
1254static int send_app_sockets_to_threads(struct ust_app *app)
1255{
1256 int ret;
1257
1258 assert(app);
1259 /* Sockets MUST be set or else this should not have been called. */
1260 assert(app->sock >= 0);
1261 assert(app->notify_sock >= 0);
1262 assert(apps_cmd_pipe[1] >= 0);
1263 assert(apps_cmd_notify_pipe[1] >= 0);
1264
1265 do {
1266 ret = write(apps_cmd_pipe[1], &app->sock, sizeof(app->sock));
1267 } while (ret < 0 && errno == EINTR);
1268 if (ret < 0 || ret != sizeof(app->sock)) {
1269 PERROR("write apps cmd pipe %d", apps_cmd_pipe[1]);
1270 if (ret < 0) {
1271 ret = -errno;
1272 }
1273 goto error;
1274 }
1275
1276 do {
1277 ret = write(apps_cmd_notify_pipe[1], &app->notify_sock,
1278 sizeof(app->notify_sock));
1279 } while (ret < 0 && errno == EINTR);
1280 if (ret < 0 || ret != sizeof(app->notify_sock)) {
1281 PERROR("write apps notify cmd pipe %d", apps_cmd_notify_pipe[1]);
1282 if (ret < 0) {
1283 ret = -errno;
1284 }
1285 goto error;
1286 }
1287
1288 /* All good. Don't send back the write positive ret value. */
1289 ret = 0;
1290error:
1291 return ret;
1292}
1293
099e26bd
DG
1294/*
1295 * Dispatch request from the registration threads to the application
1296 * communication thread.
1297 */
1298static void *thread_dispatch_ust_registration(void *data)
1299{
1300 int ret;
1301 struct cds_wfq_node *node;
1302 struct ust_command *ust_cmd = NULL;
d0b96690
DG
1303 struct {
1304 struct ust_app *app;
1305 struct cds_list_head head;
1306 } *wait_node = NULL;
1307
1308 CDS_LIST_HEAD(wait_queue);
099e26bd
DG
1309
1310 DBG("[thread] Dispatch UST command started");
1311
26c9d55e 1312 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
099e26bd
DG
1313 /* Atomically prepare the queue futex */
1314 futex_nto1_prepare(&ust_cmd_queue.futex);
1315
1316 do {
d0b96690
DG
1317 struct ust_app *app = NULL;
1318
099e26bd
DG
1319 /* Dequeue command for registration */
1320 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1321 if (node == NULL) {
00a17c97 1322 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1323 /* Continue thread execution */
1324 break;
1325 }
1326
1327 ust_cmd = caa_container_of(node, struct ust_command, node);
1328
2f50c8a3
DG
1329 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1330 " gid:%d sock:%d name:%s (version %d.%d)",
1331 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1332 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1333 ust_cmd->sock, ust_cmd->reg_msg.name,
1334 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
d0b96690
DG
1335
1336 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1337 wait_node = zmalloc(sizeof(*wait_node));
1338 if (!wait_node) {
1339 PERROR("zmalloc wait_node dispatch");
1340 goto error;
1341 }
1342 CDS_INIT_LIST_HEAD(&wait_node->head);
1343
1344 /* Create application object if socket is CMD. */
1345 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1346 ust_cmd->sock);
1347 if (!wait_node->app) {
1348 ret = close(ust_cmd->sock);
1349 if (ret < 0) {
1350 PERROR("close ust sock dispatch %d", ust_cmd->sock);
6620da75 1351 }
d0b96690
DG
1352 continue;
1353 }
1354 /*
1355 * Add application to the wait queue so we can set the notify
1356 * socket before putting this object in the global ht.
1357 */
1358 cds_list_add(&wait_node->head, &wait_queue);
1359
1360 /*
1361 * We have to continue here since we don't have the notify
1362 * socket and the application MUST be added to the hash table
1363 * only at that moment.
1364 */
1365 continue;
1366 } else {
1367 /*
1368 * Look for the application in the local wait queue and set the
1369 * notify socket if found.
1370 */
1371 cds_list_for_each_entry(wait_node, &wait_queue, head) {
1372 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
1373 wait_node->app->notify_sock = ust_cmd->sock;
1374 cds_list_del(&wait_node->head);
1375 app = wait_node->app;
1376 free(wait_node);
1377 DBG3("UST app notify socket %d is set", ust_cmd->sock);
1378 break;
1379 }
1380 }
1381 }
1382
1383 if (app) {
1384 ret = send_app_sockets_to_threads(app);
1385 if (ret < 0) {
1386 goto error;
1387 }
1388 /*
1389 * @session_lock_list
1390 *
1391 * Lock the global session list so from the register up to the
1392 * registration done message, no thread can see the application
1393 * and change its state.
1394 */
1395 session_lock_list();
1396 rcu_read_lock();
1397 /*
1398 * Add application to the global hash table. This needs to be
1399 * done before the update to the UST registry can locate the
1400 * application.
1401 */
1402 ust_app_add(app);
1403 /*
1404 * Get app version.
1405 */
1406 ret = ust_app_version(app);
1407 if (ret) {
1408 ERR("Unable to get app version");
6620da75 1409 }
d0b96690
DG
1410 /*
1411 * Update newly registered application with the tracing
1412 * registry info already enabled information.
1413 */
1414 update_ust_app(app->sock);
1415 ret = ust_app_register_done(app->sock);
1416 if (ret < 0) {
1417 /* Remove application from the registry. */
1418 ust_app_unregister(app->sock);
1419 }
1420 rcu_read_unlock();
1421 session_unlock_list();
6620da75 1422 } else {
d0b96690 1423 /* Application manager threads are not available. */
6620da75
DG
1424 ret = close(ust_cmd->sock);
1425 if (ret < 0) {
1426 PERROR("close ust_cmd sock");
099e26bd
DG
1427 }
1428 }
1429 free(ust_cmd);
1430 } while (node != NULL);
1431
1432 /* Futex wait on queue. Blocking call on futex() */
1433 futex_nto1_wait(&ust_cmd_queue.futex);
1434 }
1435
1436error:
1437 DBG("Dispatch thread dying");
1438 return NULL;
1439}
1440
1441/*
1442 * This thread manage application registration.
1443 */
1444static void *thread_registration_apps(void *data)
1d4b027a 1445{
139ac872 1446 int sock = -1, i, ret, pollfd, err = -1;
5eb91c98
DG
1447 uint32_t revents, nb_fd;
1448 struct lttng_poll_event events;
099e26bd
DG
1449 /*
1450 * Get allocated in this thread, enqueued to a global queue, dequeued and
1451 * freed in the manage apps thread.
1452 */
1453 struct ust_command *ust_cmd = NULL;
1d4b027a 1454
099e26bd 1455 DBG("[thread] Manage application registration started");
1d4b027a 1456
927ca06a
DG
1457 health_register(HEALTH_TYPE_APP_REG);
1458
6993eeb3
CB
1459 if (testpoint(thread_registration_apps)) {
1460 goto error_testpoint;
1461 }
8ac94142 1462
1d4b027a
DG
1463 ret = lttcomm_listen_unix_sock(apps_sock);
1464 if (ret < 0) {
76d7553f 1465 goto error_listen;
1d4b027a
DG
1466 }
1467
5eb91c98
DG
1468 /*
1469 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1470 * more will be added to this poll set.
1471 */
d0b96690 1472 ret = sessiond_set_thread_pollset(&events, 2);
5eb91c98 1473 if (ret < 0) {
76d7553f 1474 goto error_create_poll;
5eb91c98 1475 }
273ea72c 1476
5eb91c98
DG
1477 /* Add the application registration socket */
1478 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1479 if (ret < 0) {
76d7553f 1480 goto error_poll_add;
5eb91c98 1481 }
273ea72c 1482
1d4b027a 1483 /* Notify all applications to register */
0fdd1e2c
DG
1484 ret = notify_ust_apps(1);
1485 if (ret < 0) {
1486 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1487 "Execution continues but there might be problem for already\n"
1488 "running applications that wishes to register.");
0fdd1e2c 1489 }
1d4b027a
DG
1490
1491 while (1) {
1492 DBG("Accepting application registration");
273ea72c
DG
1493
1494 /* Inifinite blocking call, waiting for transmission */
88f2b785 1495 restart:
a78af745 1496 health_poll_entry();
5eb91c98 1497 ret = lttng_poll_wait(&events, -1);
a78af745 1498 health_poll_exit();
273ea72c 1499 if (ret < 0) {
88f2b785
MD
1500 /*
1501 * Restart interrupted system call.
1502 */
1503 if (errno == EINTR) {
1504 goto restart;
1505 }
273ea72c
DG
1506 goto error;
1507 }
1508
0d9c5d77
DG
1509 nb_fd = ret;
1510
5eb91c98 1511 for (i = 0; i < nb_fd; i++) {
840cb59c 1512 health_code_update();
139ac872 1513
5eb91c98
DG
1514 /* Fetch once the poll data */
1515 revents = LTTNG_POLL_GETEV(&events, i);
1516 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1517
5eb91c98 1518 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 1519 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
5eb91c98 1520 if (ret) {
139ac872
MD
1521 err = 0;
1522 goto exit;
90014c57 1523 }
1d4b027a 1524
5eb91c98
DG
1525 /* Event on the registration socket */
1526 if (pollfd == apps_sock) {
1527 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1528 ERR("Register apps socket poll error");
1529 goto error;
1530 } else if (revents & LPOLLIN) {
1531 sock = lttcomm_accept_unix_sock(apps_sock);
1532 if (sock < 0) {
1533 goto error;
1534 }
099e26bd 1535
b662582b
DG
1536 /*
1537 * Set the CLOEXEC flag. Return code is useless because
1538 * either way, the show must go on.
1539 */
1540 (void) utils_set_fd_cloexec(sock);
1541
5eb91c98 1542 /* Create UST registration command for enqueuing */
ba7f0ae5 1543 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1544 if (ust_cmd == NULL) {
76d7553f 1545 PERROR("ust command zmalloc");
5eb91c98
DG
1546 goto error;
1547 }
1d4b027a 1548
5eb91c98
DG
1549 /*
1550 * Using message-based transmissions to ensure we don't
1551 * have to deal with partially received messages.
1552 */
4063050c
MD
1553 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1554 if (ret < 0) {
1555 ERR("Exhausted file descriptors allowed for applications.");
1556 free(ust_cmd);
1557 ret = close(sock);
1558 if (ret) {
1559 PERROR("close");
1560 }
1561 sock = -1;
1562 continue;
1563 }
840cb59c 1564 health_code_update();
d0b96690
DG
1565 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
1566 if (ret < 0) {
5eb91c98 1567 free(ust_cmd);
d0b96690 1568 /* Close socket of the application. */
76d7553f
MD
1569 ret = close(sock);
1570 if (ret) {
1571 PERROR("close");
1572 }
4063050c 1573 lttng_fd_put(LTTNG_FD_APPS, 1);
76d7553f 1574 sock = -1;
5eb91c98
DG
1575 continue;
1576 }
840cb59c 1577 health_code_update();
099e26bd 1578
5eb91c98 1579 ust_cmd->sock = sock;
34a2494f 1580 sock = -1;
099e26bd 1581
5eb91c98
DG
1582 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1583 " gid:%d sock:%d name:%s (version %d.%d)",
1584 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1585 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1586 ust_cmd->sock, ust_cmd->reg_msg.name,
1587 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1588
5eb91c98
DG
1589 /*
1590 * Lock free enqueue the registration request. The red pill
54d01ffb 1591 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1592 */
1593 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1594
1595 /*
1596 * Wake the registration queue futex. Implicit memory
1597 * barrier with the exchange in cds_wfq_enqueue.
1598 */
1599 futex_nto1_wake(&ust_cmd_queue.futex);
1600 }
1601 }
90014c57 1602 }
1d4b027a
DG
1603 }
1604
139ac872 1605exit:
1d4b027a 1606error:
139ac872 1607 if (err) {
840cb59c 1608 health_error();
139ac872
MD
1609 ERR("Health error occurred in %s", __func__);
1610 }
139ac872 1611
0fdd1e2c
DG
1612 /* Notify that the registration thread is gone */
1613 notify_ust_apps(0);
1614
a4b35e07 1615 if (apps_sock >= 0) {
76d7553f
MD
1616 ret = close(apps_sock);
1617 if (ret) {
1618 PERROR("close");
1619 }
a4b35e07 1620 }
46c3f085 1621 if (sock >= 0) {
76d7553f
MD
1622 ret = close(sock);
1623 if (ret) {
1624 PERROR("close");
1625 }
4063050c 1626 lttng_fd_put(LTTNG_FD_APPS, 1);
a4b35e07 1627 }
273ea72c 1628 unlink(apps_unix_sock_path);
0fdd1e2c 1629
76d7553f 1630error_poll_add:
5eb91c98 1631 lttng_poll_clean(&events);
76d7553f
MD
1632error_listen:
1633error_create_poll:
6993eeb3 1634error_testpoint:
76d7553f 1635 DBG("UST Registration thread cleanup complete");
927ca06a 1636 health_unregister();
5eb91c98 1637
1d4b027a
DG
1638 return NULL;
1639}
1640
8c0faa1d 1641/*
3bd1e081 1642 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1643 * exec or it will fails.
8c0faa1d 1644 */
3bd1e081 1645static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d 1646{
a23ec3a7 1647 int ret, clock_ret;
ee0b0061
DG
1648 struct timespec timeout;
1649
a23ec3a7
DG
1650 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1651 consumer_data->consumer_thread_is_ready = 0;
8c0faa1d 1652
a23ec3a7
DG
1653 /* Setup pthread condition */
1654 ret = pthread_condattr_init(&consumer_data->condattr);
1655 if (ret != 0) {
1656 errno = ret;
1657 PERROR("pthread_condattr_init consumer data");
1658 goto error;
1659 }
1660
1661 /*
1662 * Set the monotonic clock in order to make sure we DO NOT jump in time
1663 * between the clock_gettime() call and the timedwait call. See bug #324
1664 * for a more details and how we noticed it.
1665 */
1666 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
1667 if (ret != 0) {
1668 errno = ret;
1669 PERROR("pthread_condattr_setclock consumer data");
ee0b0061
DG
1670 goto error;
1671 }
8c0faa1d 1672
a23ec3a7
DG
1673 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
1674 if (ret != 0) {
1675 errno = ret;
1676 PERROR("pthread_cond_init consumer data");
1677 goto error;
1678 }
1679
1680 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
1681 consumer_data);
8c0faa1d 1682 if (ret != 0) {
3bd1e081 1683 PERROR("pthread_create consumer");
ee0b0061 1684 ret = -1;
8c0faa1d
DG
1685 goto error;
1686 }
1687
a23ec3a7
DG
1688 /* We are about to wait on a pthread condition */
1689 pthread_mutex_lock(&consumer_data->cond_mutex);
1690
ee0b0061 1691 /* Get time for sem_timedwait absolute timeout */
a23ec3a7
DG
1692 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
1693 /*
1694 * Set the timeout for the condition timed wait even if the clock gettime
1695 * call fails since we might loop on that call and we want to avoid to
1696 * increment the timeout too many times.
1697 */
1698 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1699
1700 /*
1701 * The following loop COULD be skipped in some conditions so this is why we
1702 * set ret to 0 in order to make sure at least one round of the loop is
1703 * done.
1704 */
1705 ret = 0;
1706
1707 /*
1708 * Loop until the condition is reached or when a timeout is reached. Note
1709 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
1710 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
1711 * possible. This loop does not take any chances and works with both of
1712 * them.
1713 */
1714 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
1715 if (clock_ret < 0) {
1716 PERROR("clock_gettime spawn consumer");
1717 /* Infinite wait for the consumerd thread to be ready */
1718 ret = pthread_cond_wait(&consumer_data->cond,
1719 &consumer_data->cond_mutex);
1720 } else {
1721 ret = pthread_cond_timedwait(&consumer_data->cond,
1722 &consumer_data->cond_mutex, &timeout);
1723 }
ee0b0061 1724 }
8c0faa1d 1725
a23ec3a7
DG
1726 /* Release the pthread condition */
1727 pthread_mutex_unlock(&consumer_data->cond_mutex);
1728
1729 if (ret != 0) {
1730 errno = ret;
1731 if (ret == ETIMEDOUT) {
ee0b0061
DG
1732 /*
1733 * Call has timed out so we kill the kconsumerd_thread and return
1734 * an error.
1735 */
a23ec3a7
DG
1736 ERR("Condition timed out. The consumer thread was never ready."
1737 " Killing it");
3bd1e081 1738 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1739 if (ret < 0) {
3bd1e081 1740 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1741 }
1742 } else {
a23ec3a7 1743 PERROR("pthread_cond_wait failed consumer thread");
ee0b0061
DG
1744 }
1745 goto error;
1746 }
1747
3bd1e081
MD
1748 pthread_mutex_lock(&consumer_data->pid_mutex);
1749 if (consumer_data->pid == 0) {
a23ec3a7 1750 ERR("Consumerd did not start");
3bd1e081 1751 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1752 goto error;
1753 }
3bd1e081 1754 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1755
8c0faa1d
DG
1756 return 0;
1757
1758error:
1759 return ret;
1760}
1761
d9800920 1762/*
3bd1e081 1763 * Join consumer thread
d9800920 1764 */
3bd1e081 1765static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1766{
1767 void *status;
cf3af59e 1768
e8209f6b
DG
1769 /* Consumer pid must be a real one. */
1770 if (consumer_data->pid > 0) {
c617c0c6 1771 int ret;
3bd1e081 1772 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1773 if (ret) {
3bd1e081 1774 ERR("Error killing consumer daemon");
cf3af59e
MD
1775 return ret;
1776 }
3bd1e081 1777 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1778 } else {
1779 return 0;
1780 }
1781}
1782
8c0faa1d 1783/*
3bd1e081 1784 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1785 *
d063d709 1786 * Return pid if successful else -1.
8c0faa1d 1787 */
3bd1e081 1788static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1789{
1790 int ret;
1791 pid_t pid;
94c55f17 1792 const char *consumer_to_use;
53086306 1793 const char *verbosity;
94c55f17 1794 struct stat st;
8c0faa1d 1795
3bd1e081 1796 DBG("Spawning consumerd");
c49dc785 1797
8c0faa1d
DG
1798 pid = fork();
1799 if (pid == 0) {
1800 /*
3bd1e081 1801 * Exec consumerd.
8c0faa1d 1802 */
daee5345 1803 if (opt_verbose_consumer) {
53086306
DG
1804 verbosity = "--verbose";
1805 } else {
1806 verbosity = "--quiet";
1807 }
3bd1e081
MD
1808 switch (consumer_data->type) {
1809 case LTTNG_CONSUMER_KERNEL:
94c55f17 1810 /*
c7704d57
DG
1811 * Find out which consumerd to execute. We will first try the
1812 * 64-bit path, then the sessiond's installation directory, and
1813 * fallback on the 32-bit one,
94c55f17 1814 */
63a799e8
AM
1815 DBG3("Looking for a kernel consumer at these locations:");
1816 DBG3(" 1) %s", consumerd64_bin);
1817 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1818 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1819 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1820 DBG3("Found location #1");
94c55f17 1821 consumer_to_use = consumerd64_bin;
94c55f17 1822 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1823 DBG3("Found location #2");
94c55f17 1824 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1825 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1826 DBG3("Found location #3");
eb1e0bd4 1827 consumer_to_use = consumerd32_bin;
94c55f17 1828 } else {
63a799e8 1829 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1830 break;
1831 }
1832 DBG("Using kernel consumer at: %s", consumer_to_use);
1833 execl(consumer_to_use,
1834 "lttng-consumerd", verbosity, "-k",
1835 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1836 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1837 NULL);
3bd1e081 1838 break;
7753dea8
MD
1839 case LTTNG_CONSUMER64_UST:
1840 {
b1e0b6b6 1841 char *tmpnew = NULL;
8f4905da
MD
1842
1843 if (consumerd64_libdir[0] != '\0') {
1844 char *tmp;
1845 size_t tmplen;
1846
1847 tmp = getenv("LD_LIBRARY_PATH");
1848 if (!tmp) {
1849 tmp = "";
1850 }
1851 tmplen = strlen("LD_LIBRARY_PATH=")
1852 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1853 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1854 if (!tmpnew) {
1855 ret = -ENOMEM;
1856 goto error;
1857 }
1858 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1859 strcat(tmpnew, consumerd64_libdir);
1860 if (tmp[0] != '\0') {
1861 strcat(tmpnew, ":");
1862 strcat(tmpnew, tmp);
1863 }
1864 ret = putenv(tmpnew);
1865 if (ret) {
1866 ret = -errno;
1867 goto error;
1868 }
1869 }
94c55f17 1870 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1871 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1872 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1873 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1874 NULL);
8f4905da
MD
1875 if (consumerd64_libdir[0] != '\0') {
1876 free(tmpnew);
1877 }
1878 if (ret) {
1879 goto error;
1880 }
3bd1e081 1881 break;
7753dea8
MD
1882 }
1883 case LTTNG_CONSUMER32_UST:
1884 {
937dde8e 1885 char *tmpnew = NULL;
8f4905da
MD
1886
1887 if (consumerd32_libdir[0] != '\0') {
1888 char *tmp;
1889 size_t tmplen;
1890
1891 tmp = getenv("LD_LIBRARY_PATH");
1892 if (!tmp) {
1893 tmp = "";
1894 }
1895 tmplen = strlen("LD_LIBRARY_PATH=")
1896 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1897 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1898 if (!tmpnew) {
1899 ret = -ENOMEM;
1900 goto error;
1901 }
1902 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1903 strcat(tmpnew, consumerd32_libdir);
1904 if (tmp[0] != '\0') {
1905 strcat(tmpnew, ":");
1906 strcat(tmpnew, tmp);
1907 }
1908 ret = putenv(tmpnew);
1909 if (ret) {
1910 ret = -errno;
1911 goto error;
1912 }
1913 }
94c55f17 1914 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1915 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1916 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1917 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1918 NULL);
8f4905da
MD
1919 if (consumerd32_libdir[0] != '\0') {
1920 free(tmpnew);
1921 }
1922 if (ret) {
1923 goto error;
1924 }
7753dea8
MD
1925 break;
1926 }
3bd1e081 1927 default:
76d7553f 1928 PERROR("unknown consumer type");
3bd1e081
MD
1929 exit(EXIT_FAILURE);
1930 }
8c0faa1d 1931 if (errno != 0) {
76d7553f 1932 PERROR("kernel start consumer exec");
8c0faa1d
DG
1933 }
1934 exit(EXIT_FAILURE);
1935 } else if (pid > 0) {
1936 ret = pid;
8c0faa1d 1937 } else {
76d7553f 1938 PERROR("start consumer fork");
8c0faa1d 1939 ret = -errno;
8c0faa1d 1940 }
8f4905da 1941error:
8c0faa1d
DG
1942 return ret;
1943}
1944
693bd40b 1945/*
3bd1e081 1946 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1947 */
3bd1e081 1948static int start_consumerd(struct consumer_data *consumer_data)
693bd40b 1949{
c617c0c6 1950 int ret;
edb8b045
DG
1951
1952 /*
1953 * Set the listen() state on the socket since there is a possible race
1954 * between the exec() of the consumer daemon and this call if place in the
1955 * consumer thread. See bug #366 for more details.
1956 */
1957 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1958 if (ret < 0) {
1959 goto error;
1960 }
693bd40b 1961
3bd1e081
MD
1962 pthread_mutex_lock(&consumer_data->pid_mutex);
1963 if (consumer_data->pid != 0) {
1964 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1965 goto end;
1966 }
693bd40b 1967
3bd1e081 1968 ret = spawn_consumerd(consumer_data);
c49dc785 1969 if (ret < 0) {
3bd1e081
MD
1970 ERR("Spawning consumerd failed");
1971 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1972 goto error;
693bd40b 1973 }
c49dc785 1974
3bd1e081
MD
1975 /* Setting up the consumer_data pid */
1976 consumer_data->pid = ret;
48842b30 1977 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1978 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1979
3bd1e081
MD
1980 DBG2("Spawning consumer control thread");
1981 ret = spawn_consumer_thread(consumer_data);
693bd40b 1982 if (ret < 0) {
3bd1e081 1983 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1984 goto error;
1985 }
1986
c49dc785 1987end:
693bd40b
DG
1988 return 0;
1989
1990error:
edb8b045
DG
1991 /* Cleanup already created socket on error. */
1992 if (consumer_data->err_sock >= 0) {
c617c0c6
MD
1993 int err;
1994
edb8b045
DG
1995 err = close(consumer_data->err_sock);
1996 if (err < 0) {
1997 PERROR("close consumer data error socket");
1998 }
1999 }
693bd40b
DG
2000 return ret;
2001}
2002
44a5e5eb 2003/*
139ac872
MD
2004 * Compute health status of each consumer. If one of them is zero (bad
2005 * state), we return 0.
44a5e5eb
DG
2006 */
2007static int check_consumer_health(void)
2008{
2009 int ret;
2010
927ca06a 2011 ret = health_check_state(HEALTH_TYPE_CONSUMER);
44a5e5eb
DG
2012
2013 DBG3("Health consumer check %d", ret);
2014
2015 return ret;
2016}
2017
b73401da 2018/*
096102bd 2019 * Setup necessary data for kernel tracer action.
b73401da 2020 */
096102bd 2021static int init_kernel_tracer(void)
b73401da
DG
2022{
2023 int ret;
b73401da 2024
096102bd
DG
2025 /* Modprobe lttng kernel modules */
2026 ret = modprobe_lttng_control();
b73401da 2027 if (ret < 0) {
b73401da
DG
2028 goto error;
2029 }
2030
096102bd
DG
2031 /* Open debugfs lttng */
2032 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2033 if (kernel_tracer_fd < 0) {
2034 DBG("Failed to open %s", module_proc_lttng);
2f77fc4b
DG
2035 ret = -1;
2036 goto error_open;
54d01ffb
DG
2037 }
2038
2f77fc4b
DG
2039 /* Validate kernel version */
2040 ret = kernel_validate_version(kernel_tracer_fd);
2041 if (ret < 0) {
2042 goto error_version;
b551a063 2043 }
54d01ffb 2044
2f77fc4b
DG
2045 ret = modprobe_lttng_data();
2046 if (ret < 0) {
2047 goto error_modules;
54d01ffb
DG
2048 }
2049
2f77fc4b
DG
2050 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2051 return 0;
2052
2053error_version:
2054 modprobe_remove_lttng_control();
2055 ret = close(kernel_tracer_fd);
2056 if (ret) {
2057 PERROR("close");
b551a063 2058 }
2f77fc4b 2059 kernel_tracer_fd = -1;
f73fabfd 2060 return LTTNG_ERR_KERN_VERSION;
b551a063 2061
2f77fc4b
DG
2062error_modules:
2063 ret = close(kernel_tracer_fd);
2064 if (ret) {
2065 PERROR("close");
b551a063 2066 }
54d01ffb 2067
2f77fc4b
DG
2068error_open:
2069 modprobe_remove_lttng_control();
54d01ffb
DG
2070
2071error:
2f77fc4b
DG
2072 WARN("No kernel tracer available");
2073 kernel_tracer_fd = -1;
2074 if (!is_root) {
f73fabfd 2075 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2f77fc4b 2076 } else {
f73fabfd 2077 return LTTNG_ERR_KERN_NA;
2f77fc4b 2078 }
54d01ffb
DG
2079}
2080
2f77fc4b 2081
54d01ffb 2082/*
2f77fc4b
DG
2083 * Copy consumer output from the tracing session to the domain session. The
2084 * function also applies the right modification on a per domain basis for the
2085 * trace files destination directory.
54d01ffb 2086 */
2f77fc4b 2087static int copy_session_consumer(int domain, struct ltt_session *session)
54d01ffb
DG
2088{
2089 int ret;
2f77fc4b
DG
2090 const char *dir_name;
2091 struct consumer_output *consumer;
2092
2093 assert(session);
2094 assert(session->consumer);
54d01ffb 2095
b551a063
DG
2096 switch (domain) {
2097 case LTTNG_DOMAIN_KERNEL:
2f77fc4b 2098 DBG3("Copying tracing session consumer output in kernel session");
09a90bcd
DG
2099 /*
2100 * XXX: We should audit the session creation and what this function
2101 * does "extra" in order to avoid a destroy since this function is used
2102 * in the domain session creation (kernel and ust) only. Same for UST
2103 * domain.
2104 */
2105 if (session->kernel_session->consumer) {
2106 consumer_destroy_output(session->kernel_session->consumer);
2107 }
2f77fc4b
DG
2108 session->kernel_session->consumer =
2109 consumer_copy_output(session->consumer);
2110 /* Ease our life a bit for the next part */
2111 consumer = session->kernel_session->consumer;
2112 dir_name = DEFAULT_KERNEL_TRACE_DIR;
b551a063
DG
2113 break;
2114 case LTTNG_DOMAIN_UST:
2f77fc4b 2115 DBG3("Copying tracing session consumer output in UST session");
09a90bcd
DG
2116 if (session->ust_session->consumer) {
2117 consumer_destroy_output(session->ust_session->consumer);
2118 }
2f77fc4b
DG
2119 session->ust_session->consumer =
2120 consumer_copy_output(session->consumer);
2121 /* Ease our life a bit for the next part */
2122 consumer = session->ust_session->consumer;
2123 dir_name = DEFAULT_UST_TRACE_DIR;
b551a063
DG
2124 break;
2125 default:
f73fabfd 2126 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
54d01ffb
DG
2127 goto error;
2128 }
2129
2f77fc4b 2130 /* Append correct directory to subdir */
c30ce0b3
CB
2131 strncat(consumer->subdir, dir_name,
2132 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
2133 DBG3("Copy session consumer subdir %s", consumer->subdir);
2134
f73fabfd 2135 ret = LTTNG_OK;
54d01ffb
DG
2136
2137error:
2138 return ret;
2139}
2140
00e2e675 2141/*
2f77fc4b 2142 * Create an UST session and add it to the session ust list.
00e2e675 2143 */
2f77fc4b
DG
2144static int create_ust_session(struct ltt_session *session,
2145 struct lttng_domain *domain)
00e2e675
DG
2146{
2147 int ret;
2f77fc4b 2148 struct ltt_ust_session *lus = NULL;
00e2e675 2149
a4b92340 2150 assert(session);
2f77fc4b
DG
2151 assert(domain);
2152 assert(session->consumer);
a4b92340 2153
2f77fc4b
DG
2154 switch (domain->type) {
2155 case LTTNG_DOMAIN_UST:
2156 break;
2157 default:
2158 ERR("Unknown UST domain on create session %d", domain->type);
f73fabfd 2159 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
00e2e675
DG
2160 goto error;
2161 }
2162
2f77fc4b
DG
2163 DBG("Creating UST session");
2164
fdd9eb17 2165 lus = trace_ust_create_session(session->path, session->id);
2f77fc4b 2166 if (lus == NULL) {
f73fabfd 2167 ret = LTTNG_ERR_UST_SESS_FAIL;
a4b92340
DG
2168 goto error;
2169 }
2170
2f77fc4b
DG
2171 lus->uid = session->uid;
2172 lus->gid = session->gid;
2173 session->ust_session = lus;
00e2e675 2174
2f77fc4b
DG
2175 /* Copy session output to the newly created UST session */
2176 ret = copy_session_consumer(domain->type, session);
f73fabfd 2177 if (ret != LTTNG_OK) {
00e2e675
DG
2178 goto error;
2179 }
2180
f73fabfd 2181 return LTTNG_OK;
00e2e675
DG
2182
2183error:
2f77fc4b
DG
2184 free(lus);
2185 session->ust_session = NULL;
00e2e675
DG
2186 return ret;
2187}
2188
2189/*
2f77fc4b 2190 * Create a kernel tracer session then create the default channel.
00e2e675 2191 */
2f77fc4b 2192static int create_kernel_session(struct ltt_session *session)
00e2e675
DG
2193{
2194 int ret;
a4b92340 2195
2f77fc4b 2196 DBG("Creating kernel session");
00e2e675 2197
2f77fc4b
DG
2198 ret = kernel_create_session(session, kernel_tracer_fd);
2199 if (ret < 0) {
f73fabfd 2200 ret = LTTNG_ERR_KERN_SESS_FAIL;
00e2e675
DG
2201 goto error;
2202 }
2203
2f77fc4b
DG
2204 /* Code flow safety */
2205 assert(session->kernel_session);
2206
2207 /* Copy session output to the newly created Kernel session */
2208 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
f73fabfd 2209 if (ret != LTTNG_OK) {
a4b92340
DG
2210 goto error;
2211 }
2212
2f77fc4b
DG
2213 /* Create directory(ies) on local filesystem. */
2214 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2215 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2216 ret = run_as_mkdir_recursive(
2217 session->kernel_session->consumer->dst.trace_path,
2218 S_IRWXU | S_IRWXG, session->uid, session->gid);
2219 if (ret < 0) {
2220 if (ret != -EEXIST) {
2221 ERR("Trace directory creation error");
00e2e675
DG
2222 goto error;
2223 }
00e2e675 2224 }
2f77fc4b 2225 }
00e2e675 2226
2f77fc4b
DG
2227 session->kernel_session->uid = session->uid;
2228 session->kernel_session->gid = session->gid;
00e2e675 2229
f73fabfd 2230 return LTTNG_OK;
00e2e675 2231
2f77fc4b
DG
2232error:
2233 trace_kernel_destroy_session(session->kernel_session);
2234 session->kernel_session = NULL;
2235 return ret;
2236}
00e2e675 2237
2f77fc4b
DG
2238/*
2239 * Count number of session permitted by uid/gid.
2240 */
2241static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2242{
2243 unsigned int i = 0;
2244 struct ltt_session *session;
07424f16 2245
2f77fc4b
DG
2246 DBG("Counting number of available session for UID %d GID %d",
2247 uid, gid);
2248 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
00e2e675 2249 /*
2f77fc4b 2250 * Only list the sessions the user can control.
00e2e675 2251 */
2f77fc4b
DG
2252 if (!session_access_ok(session, uid, gid)) {
2253 continue;
2254 }
2255 i++;
a4b92340 2256 }
2f77fc4b 2257 return i;
00e2e675
DG
2258}
2259
54d01ffb
DG
2260/*
2261 * Process the command requested by the lttng client within the command
2262 * context structure. This function make sure that the return structure (llm)
2263 * is set and ready for transmission before returning.
2264 *
2265 * Return any error encountered or 0 for success.
53a80697
MD
2266 *
2267 * "sock" is only used for special-case var. len data.
54d01ffb 2268 */
53a80697
MD
2269static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2270 int *sock_error)
54d01ffb 2271{
f73fabfd 2272 int ret = LTTNG_OK;
44d3bd01 2273 int need_tracing_session = 1;
2e09ba09 2274 int need_domain;
54d01ffb
DG
2275
2276 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2277
53a80697
MD
2278 *sock_error = 0;
2279
2e09ba09
MD
2280 switch (cmd_ctx->lsm->cmd_type) {
2281 case LTTNG_CREATE_SESSION:
2282 case LTTNG_DESTROY_SESSION:
2283 case LTTNG_LIST_SESSIONS:
2284 case LTTNG_LIST_DOMAINS:
2285 case LTTNG_START_TRACE:
2286 case LTTNG_STOP_TRACE:
6d805429 2287 case LTTNG_DATA_PENDING:
2e09ba09 2288 need_domain = 0;
3aace903 2289 break;
2e09ba09
MD
2290 default:
2291 need_domain = 1;
2292 }
2293
2294 if (opt_no_kernel && need_domain
2295 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
531d29f9 2296 if (!is_root) {
f73fabfd 2297 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
531d29f9 2298 } else {
f73fabfd 2299 ret = LTTNG_ERR_KERN_NA;
531d29f9 2300 }
4fba7219
DG
2301 goto error;
2302 }
2303
8d3113b2
DG
2304 /* Deny register consumer if we already have a spawned consumer. */
2305 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
2306 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2307 if (kconsumer_data.pid > 0) {
f73fabfd 2308 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
fa317f24 2309 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
8d3113b2
DG
2310 goto error;
2311 }
2312 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2313 }
2314
54d01ffb
DG
2315 /*
2316 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 2317 * this here so we don't have to make the call for no payload at each
54d01ffb
DG
2318 * command.
2319 */
2320 switch(cmd_ctx->lsm->cmd_type) {
2321 case LTTNG_LIST_SESSIONS:
2322 case LTTNG_LIST_TRACEPOINTS:
f37d259d 2323 case LTTNG_LIST_TRACEPOINT_FIELDS:
54d01ffb
DG
2324 case LTTNG_LIST_DOMAINS:
2325 case LTTNG_LIST_CHANNELS:
2326 case LTTNG_LIST_EVENTS:
2327 break;
2328 default:
2329 /* Setup lttng message with no payload */
2330 ret = setup_lttng_msg(cmd_ctx, 0);
2331 if (ret < 0) {
2332 /* This label does not try to unlock the session */
2333 goto init_setup_error;
2334 }
2335 }
2336
2337 /* Commands that DO NOT need a session. */
2338 switch (cmd_ctx->lsm->cmd_type) {
54d01ffb 2339 case LTTNG_CREATE_SESSION:
2e09ba09 2340 case LTTNG_CALIBRATE:
54d01ffb
DG
2341 case LTTNG_LIST_SESSIONS:
2342 case LTTNG_LIST_TRACEPOINTS:
f37d259d 2343 case LTTNG_LIST_TRACEPOINT_FIELDS:
44d3bd01 2344 need_tracing_session = 0;
54d01ffb
DG
2345 break;
2346 default:
2347 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
256a5576
MD
2348 /*
2349 * We keep the session list lock across _all_ commands
2350 * for now, because the per-session lock does not
2351 * handle teardown properly.
2352 */
74babd95 2353 session_lock_list();
54d01ffb
DG
2354 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2355 if (cmd_ctx->session == NULL) {
2356 if (cmd_ctx->lsm->session.name != NULL) {
f73fabfd 2357 ret = LTTNG_ERR_SESS_NOT_FOUND;
54d01ffb
DG
2358 } else {
2359 /* If no session name specified */
f73fabfd 2360 ret = LTTNG_ERR_SELECT_SESS;
54d01ffb
DG
2361 }
2362 goto error;
2363 } else {
2364 /* Acquire lock for the session */
2365 session_lock(cmd_ctx->session);
2366 }
2367 break;
2368 }
b389abbe 2369
2e09ba09
MD
2370 if (!need_domain) {
2371 goto skip_domain;
2372 }
a4b92340 2373
54d01ffb
DG
2374 /*
2375 * Check domain type for specific "pre-action".
2376 */
2377 switch (cmd_ctx->lsm->domain.type) {
2378 case LTTNG_DOMAIN_KERNEL:
d1f1c568 2379 if (!is_root) {
f73fabfd 2380 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
d1f1c568
DG
2381 goto error;
2382 }
2383
54d01ffb 2384 /* Kernel tracer check */
a4b35e07 2385 if (kernel_tracer_fd == -1) {
54d01ffb 2386 /* Basically, load kernel tracer modules */
096102bd
DG
2387 ret = init_kernel_tracer();
2388 if (ret != 0) {
54d01ffb
DG
2389 goto error;
2390 }
2391 }
5eb91c98 2392
5c827ce0
DG
2393 /* Consumer is in an ERROR state. Report back to client */
2394 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
f73fabfd 2395 ret = LTTNG_ERR_NO_KERNCONSUMERD;
5c827ce0
DG
2396 goto error;
2397 }
2398
54d01ffb 2399 /* Need a session for kernel command */
44d3bd01 2400 if (need_tracing_session) {
54d01ffb 2401 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 2402 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 2403 if (ret < 0) {
f73fabfd 2404 ret = LTTNG_ERR_KERN_SESS_FAIL;
5eb91c98
DG
2405 goto error;
2406 }
b389abbe 2407 }
7d29a247 2408
54d01ffb 2409 /* Start the kernel consumer daemon */
3bd1e081
MD
2410 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2411 if (kconsumer_data.pid == 0 &&
785d2d0d 2412 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD
2413 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2414 ret = start_consumerd(&kconsumer_data);
7d29a247 2415 if (ret < 0) {
f73fabfd 2416 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
54d01ffb 2417 goto error;
950131af 2418 }
5c827ce0 2419 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
3ff2ecac
MD
2420 } else {
2421 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 2422 }
173af62f 2423
a4b92340
DG
2424 /*
2425 * The consumer was just spawned so we need to add the socket to
2426 * the consumer output of the session if exist.
2427 */
2428 ret = consumer_create_socket(&kconsumer_data,
2429 cmd_ctx->session->kernel_session->consumer);
2430 if (ret < 0) {
2431 goto error;
173af62f 2432 }
0d0c377a 2433 }
5c827ce0 2434
54d01ffb 2435 break;
2bdd86d4 2436 case LTTNG_DOMAIN_UST:
44d3bd01 2437 {
5c827ce0
DG
2438 /* Consumer is in an ERROR state. Report back to client */
2439 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
f73fabfd 2440 ret = LTTNG_ERR_NO_USTCONSUMERD;
5c827ce0
DG
2441 goto error;
2442 }
2443
44d3bd01 2444 if (need_tracing_session) {
a4b92340 2445 /* Create UST session if none exist. */
f6a9efaa 2446 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 2447 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 2448 &cmd_ctx->lsm->domain);
f73fabfd 2449 if (ret != LTTNG_OK) {
44d3bd01
DG
2450 goto error;
2451 }
2452 }
00e2e675 2453
7753dea8
MD
2454 /* Start the UST consumer daemons */
2455 /* 64-bit */
2456 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 2457 if (consumerd64_bin[0] != '\0' &&
7753dea8 2458 ustconsumer64_data.pid == 0 &&
785d2d0d 2459 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
2460 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2461 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 2462 if (ret < 0) {
f73fabfd 2463 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
173af62f 2464 uatomic_set(&ust_consumerd64_fd, -EINVAL);
2bdd86d4
MD
2465 goto error;
2466 }
48842b30 2467
173af62f 2468 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
5c827ce0 2469 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3ff2ecac 2470 } else {
7753dea8
MD
2471 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2472 }
173af62f
DG
2473
2474 /*
2475 * Setup socket for consumer 64 bit. No need for atomic access
2476 * since it was set above and can ONLY be set in this thread.
2477 */
a4b92340
DG
2478 ret = consumer_create_socket(&ustconsumer64_data,
2479 cmd_ctx->session->ust_session->consumer);
2480 if (ret < 0) {
2481 goto error;
173af62f
DG
2482 }
2483
7753dea8 2484 /* 32-bit */
fc7a59ce 2485 if (consumerd32_bin[0] != '\0' &&
7753dea8 2486 ustconsumer32_data.pid == 0 &&
785d2d0d 2487 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD
2488 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2489 ret = start_consumerd(&ustconsumer32_data);
2490 if (ret < 0) {
f73fabfd 2491 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
173af62f 2492 uatomic_set(&ust_consumerd32_fd, -EINVAL);
7753dea8
MD
2493 goto error;
2494 }
5c827ce0 2495
173af62f 2496 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
5c827ce0 2497 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
7753dea8
MD
2498 } else {
2499 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 2500 }
173af62f
DG
2501
2502 /*
2503 * Setup socket for consumer 64 bit. No need for atomic access
2504 * since it was set above and can ONLY be set in this thread.
2505 */
a4b92340
DG
2506 ret = consumer_create_socket(&ustconsumer32_data,
2507 cmd_ctx->session->ust_session->consumer);
2508 if (ret < 0) {
2509 goto error;
173af62f 2510 }
44d3bd01
DG
2511 }
2512 break;
48842b30 2513 }
54d01ffb 2514 default:
54d01ffb
DG
2515 break;
2516 }
2e09ba09 2517skip_domain:
33a2b854 2518
5c827ce0
DG
2519 /* Validate consumer daemon state when start/stop trace command */
2520 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
2521 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
2522 switch (cmd_ctx->lsm->domain.type) {
2523 case LTTNG_DOMAIN_UST:
2524 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
f73fabfd 2525 ret = LTTNG_ERR_NO_USTCONSUMERD;
5c827ce0
DG
2526 goto error;
2527 }
2528 break;
2529 case LTTNG_DOMAIN_KERNEL:
2530 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
f73fabfd 2531 ret = LTTNG_ERR_NO_KERNCONSUMERD;
5c827ce0
DG
2532 goto error;
2533 }
2534 break;
2535 }
2536 }
2537
8e0af1b4
MD
2538 /*
2539 * Check that the UID or GID match that of the tracing session.
2540 * The root user can interact with all sessions.
2541 */
2542 if (need_tracing_session) {
2543 if (!session_access_ok(cmd_ctx->session,
730389d9
DG
2544 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2545 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
f73fabfd 2546 ret = LTTNG_ERR_EPERM;
8e0af1b4
MD
2547 goto error;
2548 }
2549 }
2550
ffe60014
DG
2551 /*
2552 * Send relayd information to consumer as soon as we have a domain and a
2553 * session defined.
2554 */
2555 if (cmd_ctx->session && need_domain) {
2556 /*
2557 * Setup relayd if not done yet. If the relayd information was already
2558 * sent to the consumer, this call will gracefully return.
2559 */
2560 ret = cmd_setup_relayd(cmd_ctx->session);
2561 if (ret != LTTNG_OK) {
2562 goto error;
2563 }
2564 }
2565
54d01ffb
DG
2566 /* Process by command type */
2567 switch (cmd_ctx->lsm->cmd_type) {
2568 case LTTNG_ADD_CONTEXT:
2569 {
2570 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2571 cmd_ctx->lsm->u.context.channel_name,
979e618e 2572 &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]);
54d01ffb
DG
2573 break;
2574 }
2575 case LTTNG_DISABLE_CHANNEL:
2576 {
2577 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2578 cmd_ctx->lsm->u.disable.channel_name);
2579 break;
2580 }
2581 case LTTNG_DISABLE_EVENT:
2582 {
2583 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2584 cmd_ctx->lsm->u.disable.channel_name,
2585 cmd_ctx->lsm->u.disable.name);
33a2b854
DG
2586 break;
2587 }
54d01ffb
DG
2588 case LTTNG_DISABLE_ALL_EVENT:
2589 {
2bdd86d4 2590 DBG("Disabling all events");
54d01ffb
DG
2591
2592 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2593 cmd_ctx->lsm->u.disable.channel_name);
2594 break;
2595 }
2596 case LTTNG_ENABLE_CHANNEL:
2597 {
aea829b3 2598 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2f77fc4b 2599 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
54d01ffb
DG
2600 break;
2601 }
2602 case LTTNG_ENABLE_EVENT:
2603 {
2604 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2605 cmd_ctx->lsm->u.enable.channel_name,
025faf73 2606 &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]);
54d01ffb
DG
2607 break;
2608 }
2609 case LTTNG_ENABLE_ALL_EVENT:
2610 {
2bdd86d4 2611 DBG("Enabling all events");
54d01ffb
DG
2612
2613 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521 2614 cmd_ctx->lsm->u.enable.channel_name,
025faf73 2615 cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]);
54d01ffb
DG
2616 break;
2617 }
052da939 2618 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 2619 {
9f19cc17 2620 struct lttng_event *events;
54d01ffb 2621 ssize_t nb_events;
052da939 2622
54d01ffb
DG
2623 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2624 if (nb_events < 0) {
f73fabfd 2625 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2626 ret = -nb_events;
2627 goto error;
2ef84c95
DG
2628 }
2629
2630 /*
2631 * Setup lttng message with payload size set to the event list size in
2632 * bytes and then copy list into the llm payload.
2633 */
052da939 2634 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 2635 if (ret < 0) {
052da939 2636 free(events);
2ef84c95
DG
2637 goto setup_error;
2638 }
2639
2640 /* Copy event list into message payload */
9f19cc17 2641 memcpy(cmd_ctx->llm->payload, events,
052da939 2642 sizeof(struct lttng_event) * nb_events);
2ef84c95 2643
9f19cc17 2644 free(events);
2ef84c95 2645
f73fabfd 2646 ret = LTTNG_OK;
2ef84c95
DG
2647 break;
2648 }
f37d259d
MD
2649 case LTTNG_LIST_TRACEPOINT_FIELDS:
2650 {
2651 struct lttng_event_field *fields;
2652 ssize_t nb_fields;
2653
a4b92340
DG
2654 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
2655 &fields);
f37d259d 2656 if (nb_fields < 0) {
f73fabfd 2657 /* Return value is a negative lttng_error_code. */
f37d259d
MD
2658 ret = -nb_fields;
2659 goto error;
2660 }
2661
2662 /*
2663 * Setup lttng message with payload size set to the event list size in
2664 * bytes and then copy list into the llm payload.
2665 */
a4b92340
DG
2666 ret = setup_lttng_msg(cmd_ctx,
2667 sizeof(struct lttng_event_field) * nb_fields);
f37d259d
MD
2668 if (ret < 0) {
2669 free(fields);
2670 goto setup_error;
2671 }
2672
2673 /* Copy event list into message payload */
2674 memcpy(cmd_ctx->llm->payload, fields,
2675 sizeof(struct lttng_event_field) * nb_fields);
2676
2677 free(fields);
2678
f73fabfd 2679 ret = LTTNG_OK;
f37d259d
MD
2680 break;
2681 }
00e2e675
DG
2682 case LTTNG_SET_CONSUMER_URI:
2683 {
a4b92340
DG
2684 size_t nb_uri, len;
2685 struct lttng_uri *uris;
2686
2687 nb_uri = cmd_ctx->lsm->u.uri.size;
2688 len = nb_uri * sizeof(struct lttng_uri);
2689
2690 if (nb_uri == 0) {
f73fabfd 2691 ret = LTTNG_ERR_INVALID;
a4b92340
DG
2692 goto error;
2693 }
2694
2695 uris = zmalloc(len);
2696 if (uris == NULL) {
f73fabfd 2697 ret = LTTNG_ERR_FATAL;
a4b92340
DG
2698 goto error;
2699 }
2700
2701 /* Receive variable len data */
77c7c900 2702 DBG("Receiving %zu URI(s) from client ...", nb_uri);
a4b92340
DG
2703 ret = lttcomm_recv_unix_sock(sock, uris, len);
2704 if (ret <= 0) {
2705 DBG("No URIs received from client... continuing");
2706 *sock_error = 1;
f73fabfd 2707 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2708 free(uris);
a4b92340
DG
2709 goto error;
2710 }
2711
00e2e675 2712 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
a4b92340 2713 nb_uri, uris);
f73fabfd 2714 if (ret != LTTNG_OK) {
b1d41407 2715 free(uris);
a4b92340
DG
2716 goto error;
2717 }
2718
2719 /*
2720 * XXX: 0 means that this URI should be applied on the session. Should
2721 * be a DOMAIN enuam.
2722 */
2723 if (cmd_ctx->lsm->domain.type == 0) {
2724 /* Add the URI for the UST session if a consumer is present. */
2725 if (cmd_ctx->session->ust_session &&
2726 cmd_ctx->session->ust_session->consumer) {
2727 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session,
2728 nb_uri, uris);
2729 } else if (cmd_ctx->session->kernel_session &&
2730 cmd_ctx->session->kernel_session->consumer) {
2731 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL,
2732 cmd_ctx->session, nb_uri, uris);
2733 }
2734 }
2735
b1d41407
DG
2736 free(uris);
2737
00e2e675
DG
2738 break;
2739 }
f3ed775e 2740 case LTTNG_START_TRACE:
8c0faa1d 2741 {
54d01ffb 2742 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG
2743 break;
2744 }
f3ed775e 2745 case LTTNG_STOP_TRACE:
8c0faa1d 2746 {
54d01ffb 2747 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG
2748 break;
2749 }
5e16da05
MD
2750 case LTTNG_CREATE_SESSION:
2751 {
a4b92340
DG
2752 size_t nb_uri, len;
2753 struct lttng_uri *uris = NULL;
2754
2755 nb_uri = cmd_ctx->lsm->u.uri.size;
2756 len = nb_uri * sizeof(struct lttng_uri);
2757
2758 if (nb_uri > 0) {
2759 uris = zmalloc(len);
2760 if (uris == NULL) {
f73fabfd 2761 ret = LTTNG_ERR_FATAL;
a4b92340
DG
2762 goto error;
2763 }
2764
2765 /* Receive variable len data */
77c7c900 2766 DBG("Waiting for %zu URIs from client ...", nb_uri);
a4b92340
DG
2767 ret = lttcomm_recv_unix_sock(sock, uris, len);
2768 if (ret <= 0) {
2769 DBG("No URIs received from client... continuing");
2770 *sock_error = 1;
f73fabfd 2771 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2772 free(uris);
a4b92340
DG
2773 goto error;
2774 }
2775
2776 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
2777 DBG("Creating session with ONE network URI is a bad call");
f73fabfd 2778 ret = LTTNG_ERR_SESSION_FAIL;
b1d41407 2779 free(uris);
a4b92340
DG
2780 goto error;
2781 }
2782 }
2783
2784 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
2785 &cmd_ctx->creds);
2786
b1d41407
DG
2787 free(uris);
2788
00e2e675
DG
2789 break;
2790 }
5e16da05
MD
2791 case LTTNG_DESTROY_SESSION:
2792 {
2f77fc4b 2793 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
a4b92340
DG
2794
2795 /* Set session to NULL so we do not unlock it after free. */
256a5576 2796 cmd_ctx->session = NULL;
5461b305 2797 break;
5e16da05 2798 }
9f19cc17 2799 case LTTNG_LIST_DOMAINS:
5e16da05 2800 {
54d01ffb
DG
2801 ssize_t nb_dom;
2802 struct lttng_domain *domains;
5461b305 2803
54d01ffb
DG
2804 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
2805 if (nb_dom < 0) {
f73fabfd 2806 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2807 ret = -nb_dom;
2808 goto error;
ce3d728c 2809 }
520ff687 2810
54d01ffb 2811 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG
2812 if (ret < 0) {
2813 goto setup_error;
520ff687 2814 }
57167058 2815
54d01ffb
DG
2816 /* Copy event list into message payload */
2817 memcpy(cmd_ctx->llm->payload, domains,
2818 nb_dom * sizeof(struct lttng_domain));
2819
2820 free(domains);
5e16da05 2821
f73fabfd 2822 ret = LTTNG_OK;
5e16da05
MD
2823 break;
2824 }
9f19cc17 2825 case LTTNG_LIST_CHANNELS:
5e16da05 2826 {
6775595e 2827 int nb_chan;
54d01ffb
DG
2828 struct lttng_channel *channels;
2829
b551a063
DG
2830 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
2831 cmd_ctx->session, &channels);
54d01ffb 2832 if (nb_chan < 0) {
f73fabfd 2833 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2834 ret = -nb_chan;
2835 goto error;
5461b305 2836 }
ca95a216 2837
54d01ffb 2838 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG
2839 if (ret < 0) {
2840 goto setup_error;
2841 }
9f19cc17 2842
54d01ffb
DG
2843 /* Copy event list into message payload */
2844 memcpy(cmd_ctx->llm->payload, channels,
2845 nb_chan * sizeof(struct lttng_channel));
2846
2847 free(channels);
9f19cc17 2848
f73fabfd 2849 ret = LTTNG_OK;
5461b305 2850 break;
5e16da05 2851 }
9f19cc17 2852 case LTTNG_LIST_EVENTS:
5e16da05 2853 {
b551a063 2854 ssize_t nb_event;
684d34d2 2855 struct lttng_event *events = NULL;
9f19cc17 2856
b551a063 2857 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG
2858 cmd_ctx->lsm->u.list.channel_name, &events);
2859 if (nb_event < 0) {
f73fabfd 2860 /* Return value is a negative lttng_error_code. */
54d01ffb
DG
2861 ret = -nb_event;
2862 goto error;
5461b305 2863 }
ca95a216 2864
54d01ffb 2865 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG
2866 if (ret < 0) {
2867 goto setup_error;
2868 }
9f19cc17 2869
54d01ffb
DG
2870 /* Copy event list into message payload */
2871 memcpy(cmd_ctx->llm->payload, events,
2872 nb_event * sizeof(struct lttng_event));
9f19cc17 2873
54d01ffb 2874 free(events);
9f19cc17 2875
f73fabfd 2876 ret = LTTNG_OK;
5461b305 2877 break;
5e16da05
MD
2878 }
2879 case LTTNG_LIST_SESSIONS:
2880 {
8e0af1b4 2881 unsigned int nr_sessions;
5461b305 2882
8e0af1b4 2883 session_lock_list();
730389d9
DG
2884 nr_sessions = lttng_sessions_count(
2885 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2886 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
d32fb093 2887
8e0af1b4 2888 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 2889 if (ret < 0) {
54d01ffb 2890 session_unlock_list();
5461b305 2891 goto setup_error;
e065084a 2892 }
5e16da05 2893
6c9cc2ab 2894 /* Filled the session array */
2f77fc4b 2895 cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
730389d9
DG
2896 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2897 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
6c9cc2ab 2898
54d01ffb 2899 session_unlock_list();
5e16da05 2900
f73fabfd 2901 ret = LTTNG_OK;
5e16da05
MD
2902 break;
2903 }
d0254c7c
MD
2904 case LTTNG_CALIBRATE:
2905 {
54d01ffb
DG
2906 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
2907 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD
2908 break;
2909 }
d9800920
DG
2910 case LTTNG_REGISTER_CONSUMER:
2911 {
2f77fc4b
DG
2912 struct consumer_data *cdata;
2913
2914 switch (cmd_ctx->lsm->domain.type) {
2915 case LTTNG_DOMAIN_KERNEL:
2916 cdata = &kconsumer_data;
2917 break;
2918 default:
f73fabfd 2919 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2920 goto error;
2921 }
2922
54d01ffb 2923 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2f77fc4b 2924 cmd_ctx->lsm->u.reg.path, cdata);
d9800920
DG
2925 break;
2926 }
025faf73 2927 case LTTNG_ENABLE_EVENT_WITH_FILTER:
53a80697
MD
2928 {
2929 struct lttng_filter_bytecode *bytecode;
2930
025faf73 2931 if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) {
f73fabfd 2932 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
2933 goto error;
2934 }
52df2401
MD
2935 if (cmd_ctx->lsm->u.enable.bytecode_len == 0) {
2936 ret = LTTNG_ERR_FILTER_INVAL;
2937 goto error;
2938 }
025faf73 2939 bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len);
53a80697 2940 if (!bytecode) {
f73fabfd 2941 ret = LTTNG_ERR_FILTER_NOMEM;
53a80697
MD
2942 goto error;
2943 }
2944 /* Receive var. len. data */
2945 DBG("Receiving var len data from client ...");
2946 ret = lttcomm_recv_unix_sock(sock, bytecode,
025faf73 2947 cmd_ctx->lsm->u.enable.bytecode_len);
53a80697
MD
2948 if (ret <= 0) {
2949 DBG("Nothing recv() from client var len data... continuing");
2950 *sock_error = 1;
f73fabfd 2951 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
2952 goto error;
2953 }
2954
2955 if (bytecode->len + sizeof(*bytecode)
025faf73 2956 != cmd_ctx->lsm->u.enable.bytecode_len) {
53a80697 2957 free(bytecode);
f73fabfd 2958 ret = LTTNG_ERR_FILTER_INVAL;
53a80697
MD
2959 goto error;
2960 }
2961
025faf73
DG
2962 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2963 cmd_ctx->lsm->u.enable.channel_name,
2964 &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]);
53a80697
MD
2965 break;
2966 }
6d805429 2967 case LTTNG_DATA_PENDING:
806e2684 2968 {
6d805429 2969 ret = cmd_data_pending(cmd_ctx->session);
806e2684
DG
2970 break;
2971 }
5e16da05 2972 default:
f73fabfd 2973 ret = LTTNG_ERR_UND;
5461b305 2974 break;
fac6795d
DG
2975 }
2976
5461b305 2977error:
5461b305
DG
2978 if (cmd_ctx->llm == NULL) {
2979 DBG("Missing llm structure. Allocating one.");
894be886 2980 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
2981 goto setup_error;
2982 }
2983 }
54d01ffb 2984 /* Set return code */
5461b305 2985 cmd_ctx->llm->ret_code = ret;
5461b305 2986setup_error:
b5541356 2987 if (cmd_ctx->session) {
54d01ffb 2988 session_unlock(cmd_ctx->session);
b5541356 2989 }
256a5576
MD
2990 if (need_tracing_session) {
2991 session_unlock_list();
2992 }
54d01ffb 2993init_setup_error:
8028d920 2994 return ret;
fac6795d
DG
2995}
2996
44a5e5eb
DG
2997/*
2998 * Thread managing health check socket.
2999 */
3000static void *thread_manage_health(void *data)
3001{
eb4a2943 3002 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
44a5e5eb
DG
3003 uint32_t revents, nb_fd;
3004 struct lttng_poll_event events;
3005 struct lttcomm_health_msg msg;
3006 struct lttcomm_health_data reply;
3007
3008 DBG("[thread] Manage health check started");
3009
3010 rcu_register_thread();
3011
3012 /* Create unix socket */
3013 sock = lttcomm_create_unix_sock(health_unix_sock_path);
3014 if (sock < 0) {
3015 ERR("Unable to create health check Unix socket");
3016 ret = -1;
3017 goto error;
3018 }
3019
b662582b
DG
3020 /*
3021 * Set the CLOEXEC flag. Return code is useless because either way, the
3022 * show must go on.
3023 */
3024 (void) utils_set_fd_cloexec(sock);
3025
44a5e5eb
DG
3026 ret = lttcomm_listen_unix_sock(sock);
3027 if (ret < 0) {
3028 goto error;
3029 }
3030
3031 /*
3032 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3033 * more will be added to this poll set.
3034 */
d0b96690 3035 ret = sessiond_set_thread_pollset(&events, 2);
44a5e5eb
DG
3036 if (ret < 0) {
3037 goto error;
3038 }
3039
3040 /* Add the application registration socket */
3041 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
3042 if (ret < 0) {
3043 goto error;
3044 }
3045
3046 while (1) {
3047 DBG("Health check ready");
3048
44a5e5eb
DG
3049 /* Inifinite blocking call, waiting for transmission */
3050restart:
3051 ret = lttng_poll_wait(&events, -1);
3052 if (ret < 0) {
3053 /*
3054 * Restart interrupted system call.
3055 */
3056 if (errno == EINTR) {
3057 goto restart;
3058 }
3059 goto error;
3060 }
3061
0d9c5d77
DG
3062 nb_fd = ret;
3063
44a5e5eb
DG
3064 for (i = 0; i < nb_fd; i++) {
3065 /* Fetch once the poll data */
3066 revents = LTTNG_POLL_GETEV(&events, i);
3067 pollfd = LTTNG_POLL_GETFD(&events, i);
3068
3069 /* Thread quit pipe has been closed. Killing thread. */
d0b96690 3070 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
44a5e5eb 3071 if (ret) {
139ac872
MD
3072 err = 0;
3073 goto exit;
44a5e5eb
DG
3074 }
3075
3076 /* Event on the registration socket */
3077 if (pollfd == sock) {
3078 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3079 ERR("Health socket poll error");
3080 goto error;
3081 }
3082 }
3083 }
3084
3085 new_sock = lttcomm_accept_unix_sock(sock);
3086 if (new_sock < 0) {
3087 goto error;
3088 }
3089
b662582b
DG
3090 /*
3091 * Set the CLOEXEC flag. Return code is useless because either way, the
3092 * show must go on.
3093 */
3094 (void) utils_set_fd_cloexec(new_sock);
3095
44a5e5eb
DG
<