Fix: report error to client on consumerd error
[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 *
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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
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20#include <getopt.h>
21#include <grp.h>
22#include <limits.h>
23#include <pthread.h>
8c0faa1d 24#include <semaphore.h>
fac6795d
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25#include <signal.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
0fdd1e2c 29#include <sys/mman.h>
b73401da 30#include <sys/mount.h>
1e307fab 31#include <sys/resource.h>
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32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/types.h>
0fdd1e2c
DG
35#include <sys/wait.h>
36#include <urcu/futex.h>
5c827ce0 37#include <urcu/uatomic.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
990570ed 41#include <common/common.h>
0ba98ebc 42#include <common/compat/poll.h>
d27c42b8 43#include <common/compat/socket.h>
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44#include <common/defaults.h>
45#include <common/kernel-consumer/kernel-consumer.h>
46#include <common/ust-consumer/ust-consumer.h>
fac6795d 47
10a8a223 48#include "lttng-sessiond.h"
54d01ffb 49#include "channel.h"
099e26bd 50#include "context.h"
54d01ffb 51#include "event.h"
099e26bd 52#include "futex.h"
4771f025 53#include "kernel.h"
096102bd 54#include "modprobe.h"
0fdd1e2c 55#include "shm.h"
1e307fab 56#include "ust-ctl.h"
8e68d1c8 57#include "utils.h"
4063050c 58#include "fd-limit.h"
fac6795d 59
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60#define CONSUMERD_FILE "lttng-consumerd"
61
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MD
62struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78};
79
75462a81 80/* Const values */
686204ab 81const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 82const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
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MD
83const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
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86const char *progname;
87const char *opt_tracing_group;
5b8719f5 88static int opt_sig_parent;
97e19046 89static int opt_verbose_consumer;
fac6795d 90static int opt_daemon;
4fba7219 91static int opt_no_kernel;
fac6795d 92static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 93static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 94static char *rundir;
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95
96/* Consumer daemon specific control data */
97static struct consumer_data kconsumer_data = {
98 .type = LTTNG_CONSUMER_KERNEL,
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99 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
100 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
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101 .err_sock = -1,
102 .cmd_sock = -1,
3bd1e081 103};
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104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
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106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
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108 .err_sock = -1,
109 .cmd_sock = -1,
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110};
111static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
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113 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
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115 .err_sock = -1,
116 .cmd_sock = -1,
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117};
118
099e26bd 119static int dispatch_thread_exit;
fac6795d 120
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121/* Global application Unix socket path */
122static char apps_unix_sock_path[PATH_MAX];
123/* Global client Unix socket path */
124static char client_unix_sock_path[PATH_MAX];
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125/* global wait shm path for UST */
126static char wait_shm_path[PATH_MAX];
fac6795d 127
1d4b027a 128/* Sockets and FDs */
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129static int client_sock = -1;
130static int apps_sock = -1;
131static int kernel_tracer_fd = -1;
76d7553f 132static int kernel_poll_pipe[2] = { -1, -1 };
1d4b027a 133
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134/*
135 * Quit pipe for all threads. This permits a single cancellation point
136 * for all threads when receiving an event on the pipe.
137 */
76d7553f 138static int thread_quit_pipe[2] = { -1, -1 };
273ea72c 139
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140/*
141 * This pipe is used to inform the thread managing application communication
142 * that a command is queued and ready to be processed.
143 */
76d7553f 144static int apps_cmd_pipe[2] = { -1, -1 };
099e26bd 145
1d4b027a 146/* Pthread, Mutexes and Semaphores */
1d4b027a 147static pthread_t apps_thread;
099e26bd 148static pthread_t reg_apps_thread;
1d4b027a 149static pthread_t client_thread;
7a485870 150static pthread_t kernel_thread;
099e26bd 151static pthread_t dispatch_thread;
5eb91c98 152
fac6795d 153
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154/*
155 * UST registration command queue. This queue is tied with a futex and uses a N
156 * wakers / 1 waiter implemented and detailed in futex.c/.h
157 *
158 * The thread_manage_apps and thread_dispatch_ust_registration interact with
159 * this queue and the wait/wake scheme.
160 */
161static struct ust_cmd_queue ust_cmd_queue;
162
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163/*
164 * Pointer initialized before thread creation.
165 *
166 * This points to the tracing session list containing the session count and a
167 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
168 * MUST NOT be taken if you call a public function in session.c.
04ea676f 169 *
d063d709 170 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 171 * session_lock_list and session_unlock_list for lock acquisition.
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172 */
173static struct ltt_session_list *session_list_ptr;
174
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175int ust_consumerd64_fd = -1;
176int ust_consumerd32_fd = -1;
177
fb6f1fa2
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178static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
179static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
180static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
181static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a 182
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183/*
184 * Consumer daemon state which is changed when spawning it, killing it or in
185 * case of a fatal error.
186 */
187enum consumerd_state {
188 CONSUMER_STARTED = 1,
189 CONSUMER_STOPPED = 2,
190 CONSUMER_ERROR = 3,
191};
192
193/*
194 * This consumer daemon state is used to validate if a client command will be
195 * able to reach the consumer. If not, the client is informed. For instance,
196 * doing a "lttng start" when the consumer state is set to ERROR will return an
197 * error to the client.
198 *
199 * The following example shows a possible race condition of this scheme:
200 *
201 * consumer thread error happens
202 * client cmd arrives
203 * client cmd checks state -> still OK
204 * consumer thread exit, sets error
205 * client cmd try to talk to consumer
206 * ...
207 *
208 * However, since the consumer is a different daemon, we have no way of making
209 * sure the command will reach it safely even with this state flag. This is why
210 * we consider that up to the state validation during command processing, the
211 * command is safe. After that, we can not guarantee the correctness of the
212 * client request vis-a-vis the consumer.
213 */
214static enum consumerd_state ust_consumerd_state;
215static enum consumerd_state kernel_consumerd_state;
216
fb09408a 217static
7753dea8 218void setup_consumerd_path(void)
fb09408a 219{
fc7a59ce 220 const char *bin, *libdir;
fb09408a 221
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222 /*
223 * Allow INSTALL_BIN_PATH to be used as a target path for the
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224 * native architecture size consumer if CONFIG_CONSUMER*_PATH
225 * has not been defined.
7753dea8 226 */
ebaeda94 227#if (CAA_BITS_PER_LONG == 32)
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228 if (!consumerd32_bin[0]) {
229 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
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230 }
231 if (!consumerd32_libdir[0]) {
232 consumerd32_libdir = INSTALL_LIB_PATH;
233 }
234#elif (CAA_BITS_PER_LONG == 64)
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235 if (!consumerd64_bin[0]) {
236 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 237 }
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238 if (!consumerd64_libdir[0]) {
239 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
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240 }
241#else
242#error "Unknown bitness"
243#endif
244
fb09408a
MD
245 /*
246 * runtime env. var. overrides the build default.
247 */
fc7a59ce
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248 bin = getenv("LTTNG_CONSUMERD32_BIN");
249 if (bin) {
250 consumerd32_bin = bin;
7753dea8 251 }
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252 bin = getenv("LTTNG_CONSUMERD64_BIN");
253 if (bin) {
254 consumerd64_bin = bin;
ebaeda94 255 }
72f579ee 256 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
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257 if (libdir) {
258 consumerd32_libdir = libdir;
259 }
72f579ee 260 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
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261 if (libdir) {
262 consumerd64_libdir = libdir;
fb09408a
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263 }
264}
265
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266/*
267 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
268 */
269static int create_thread_poll_set(struct lttng_poll_event *events,
270 unsigned int size)
271{
272 int ret;
273
274 if (events == NULL || size == 0) {
275 ret = -1;
276 goto error;
277 }
278
279 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
280 if (ret < 0) {
281 goto error;
282 }
283
284 /* Add quit pipe */
285 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
286 if (ret < 0) {
287 goto error;
288 }
289
290 return 0;
291
292error:
293 return ret;
294}
295
296/*
297 * Check if the thread quit pipe was triggered.
298 *
299 * Return 1 if it was triggered else 0;
300 */
301static int check_thread_quit_pipe(int fd, uint32_t events)
302{
303 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
304 return 1;
305 }
306
307 return 0;
308}
309
0fdd1e2c
DG
310/*
311 * Return group ID of the tracing group or -1 if not found.
312 */
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MD
313static gid_t allowed_group(void)
314{
315 struct group *grp;
316
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MD
317 if (opt_tracing_group) {
318 grp = getgrnam(opt_tracing_group);
319 } else {
320 grp = getgrnam(default_tracing_group);
321 }
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MD
322 if (!grp) {
323 return -1;
324 } else {
325 return grp->gr_gid;
326 }
327}
328
273ea72c 329/*
5eb91c98 330 * Init thread quit pipe.
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DG
331 *
332 * Return -1 on error or 0 if all pipes are created.
333 */
334static int init_thread_quit_pipe(void)
335{
730389d9 336 int ret, i;
273ea72c 337
730389d9 338 ret = pipe(thread_quit_pipe);
273ea72c 339 if (ret < 0) {
730389d9 340 PERROR("thread quit pipe");
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DG
341 goto error;
342 }
343
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DG
344 for (i = 0; i < 2; i++) {
345 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
346 if (ret < 0) {
347 PERROR("fcntl");
348 goto error;
349 }
350 }
351
273ea72c
DG
352error:
353 return ret;
354}
355
fac6795d 356/*
d063d709
DG
357 * Complete teardown of a kernel session. This free all data structure related
358 * to a kernel session and update counter.
fac6795d 359 */
1d4b027a 360static void teardown_kernel_session(struct ltt_session *session)
fac6795d 361{
8f7a84dd 362 if (!session->kernel_session) {
99bab54f 363 DBG3("No kernel session when tearing down session");
84ea9c99 364 return;
8f7a84dd
DG
365 }
366
84ea9c99 367 DBG("Tearing down kernel session");
d9800920 368
84ea9c99
MD
369 /*
370 * If a custom kernel consumer was registered, close the socket before
371 * tearing down the complete kernel session structure
372 */
03550b58
MD
373 if (kconsumer_data.cmd_sock >= 0 &&
374 session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
84ea9c99 375 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 376 }
84ea9c99
MD
377
378 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG
379}
380
f6a9efaa
DG
381/*
382 * Complete teardown of all UST sessions. This will free everything on his path
383 * and destroy the core essence of all ust sessions :)
384 */
385static void teardown_ust_session(struct ltt_session *session)
386{
84cd17c6
MD
387 int ret;
388
8f7a84dd 389 if (!session->ust_session) {
99bab54f 390 DBG3("No UST session when tearing down session");
f470a390 391 return;
8f7a84dd
DG
392 }
393
84ea9c99 394 DBG("Tearing down UST session(s)");
8f7a84dd 395
84cd17c6
MD
396 ret = ust_app_destroy_trace_all(session->ust_session);
397 if (ret) {
398 ERR("Error in ust_app_destroy_trace_all");
399 }
8f7a84dd 400
f6a9efaa
DG
401 trace_ust_destroy_session(session->ust_session);
402}
403
099e26bd
DG
404/*
405 * Stop all threads by closing the thread quit pipe.
406 */
cf3af59e
MD
407static void stop_threads(void)
408{
5eb91c98
DG
409 int ret;
410
cf3af59e
MD
411 /* Stopping all threads */
412 DBG("Terminating all threads");
54d01ffb 413 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG
414 if (ret < 0) {
415 ERR("write error on thread quit pipe");
416 }
417
099e26bd
DG
418 /* Dispatch thread */
419 dispatch_thread_exit = 1;
420 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD
421}
422
fac6795d 423/*
d063d709 424 * Cleanup the daemon
fac6795d 425 */
cf3af59e 426static void cleanup(void)
fac6795d 427{
76d7553f 428 int ret, i;
1d4b027a 429 char *cmd;
af9737e9 430 struct ltt_session *sess, *stmp;
fac6795d 431
1d4b027a 432 DBG("Cleaning up");
e07ae692 433
67e40797
DG
434 DBG("Removing %s directory", rundir);
435 ret = asprintf(&cmd, "rm -rf %s", rundir);
436 if (ret < 0) {
437 ERR("asprintf failed. Something is really wrong!");
438 }
5461b305 439
67e40797
DG
440 /* Remove lttng run directory */
441 ret = system(cmd);
442 if (ret < 0) {
443 ERR("Unable to clean %s", rundir);
1d4b027a 444 }
67e40797 445 free(cmd);
5461b305 446
99bab54f 447 DBG("Cleaning up all sessions");
fac6795d 448
b5541356 449 /* Destroy session list mutex */
273ea72c
DG
450 if (session_list_ptr != NULL) {
451 pthread_mutex_destroy(&session_list_ptr->lock);
452
453 /* Cleanup ALL session */
54d01ffb
DG
454 cds_list_for_each_entry_safe(sess, stmp,
455 &session_list_ptr->head, list) {
273ea72c 456 teardown_kernel_session(sess);
f6a9efaa
DG
457 teardown_ust_session(sess);
458 free(sess);
273ea72c
DG
459 }
460 }
461
099e26bd 462 DBG("Closing all UST sockets");
56fff090 463 ust_app_clean_list();
099e26bd 464
3bd1e081 465 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 466
4fba7219
DG
467 if (is_root && !opt_no_kernel) {
468 DBG2("Closing kernel fd");
a4b35e07 469 if (kernel_tracer_fd >= 0) {
76d7553f
MD
470 ret = close(kernel_tracer_fd);
471 if (ret) {
472 PERROR("close");
473 }
a4b35e07 474 }
2f50c8a3 475 DBG("Unloading kernel modules");
096102bd 476 modprobe_remove_lttng_all();
2f50c8a3 477 }
5eb91c98 478
76d7553f
MD
479 /*
480 * Closing all pipes used for communication between threads.
481 */
482 for (i = 0; i < 2; i++) {
483 if (kernel_poll_pipe[i] >= 0) {
484 ret = close(kernel_poll_pipe[i]);
485 if (ret) {
486 PERROR("close");
487 }
76d7553f
MD
488 }
489 }
490 for (i = 0; i < 2; i++) {
491 if (thread_quit_pipe[i] >= 0) {
492 ret = close(thread_quit_pipe[i]);
493 if (ret) {
494 PERROR("close");
495 }
496 }
497 }
498 for (i = 0; i < 2; i++) {
499 if (apps_cmd_pipe[i] >= 0) {
500 ret = close(apps_cmd_pipe[i]);
501 if (ret) {
502 PERROR("close");
503 }
504 }
505 }
421cb601
DG
506
507 /* <fun> */
f56a39af 508 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG
509 "Matthew, BEET driven development works!%c[%dm",
510 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
511 /* </fun> */
fac6795d
DG
512}
513
e065084a 514/*
d063d709 515 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 516 *
d063d709 517 * Return lttcomm error code.
e065084a
DG
518 */
519static int send_unix_sock(int sock, void *buf, size_t len)
520{
521 /* Check valid length */
522 if (len <= 0) {
523 return -1;
524 }
525
526 return lttcomm_send_unix_sock(sock, buf, len);
527}
528
5461b305 529/*
d063d709 530 * Free memory of a command context structure.
5461b305 531 */
a2fb29a5 532static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 533{
a2fb29a5
DG
534 DBG("Clean command context structure");
535 if (*cmd_ctx) {
536 if ((*cmd_ctx)->llm) {
537 free((*cmd_ctx)->llm);
5461b305 538 }
a2fb29a5
DG
539 if ((*cmd_ctx)->lsm) {
540 free((*cmd_ctx)->lsm);
5461b305 541 }
a2fb29a5
DG
542 free(*cmd_ctx);
543 *cmd_ctx = NULL;
5461b305
DG
544 }
545}
546
f3ed775e 547/*
d063d709 548 * Send all stream fds of kernel channel to the consumer.
f3ed775e 549 */
2bdd86d4 550static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD
551 int sock, struct ltt_kernel_channel *channel,
552 uid_t uid, gid_t gid)
f3ed775e
DG
553{
554 int ret;
f3ed775e 555 struct ltt_kernel_stream *stream;
3bd1e081 556 struct lttcomm_consumer_msg lkm;
f3ed775e 557
3bd1e081 558 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 559 channel->channel->name);
f3ed775e 560
3bd1e081
MD
561 /* Send channel */
562 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
563 lkm.u.channel.channel_key = channel->fd;
564 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
565 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 566 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 567 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 568 if (ret < 0) {
76d7553f 569 PERROR("send consumer channel");
f3ed775e
DG
570 goto error;
571 }
572
3bd1e081 573 /* Send streams */
7a485870 574 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD
575 if (!stream->fd) {
576 continue;
577 }
578 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
579 lkm.u.stream.channel_key = channel->fd;
580 lkm.u.stream.stream_key = stream->fd;
581 lkm.u.stream.state = stream->state;
582 lkm.u.stream.output = channel->channel->attr.output;
583 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
584 lkm.u.stream.uid = uid;
585 lkm.u.stream.gid = gid;
3bd1e081
MD
586 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
587 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
588 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
589 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
590 if (ret < 0) {
76d7553f 591 PERROR("send consumer stream");
3bd1e081
MD
592 goto error;
593 }
594 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
595 if (ret < 0) {
76d7553f 596 PERROR("send consumer stream ancillary data");
3bd1e081 597 goto error;
f3ed775e
DG
598 }
599 }
600
3bd1e081 601 DBG("consumer channel streams sent");
f3ed775e
DG
602
603 return 0;
604
605error:
606 return ret;
607}
608
609/*
d063d709 610 * Send all stream fds of the kernel session to the consumer.
f3ed775e 611 */
2bdd86d4 612static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 613 struct ltt_kernel_session *session)
f3ed775e
DG
614{
615 int ret;
616 struct ltt_kernel_channel *chan;
3bd1e081
MD
617 struct lttcomm_consumer_msg lkm;
618 int sock = session->consumer_fd;
7a485870
DG
619
620 DBG("Sending metadata stream fd");
621
03550b58
MD
622 /* Extra protection. It's NOT supposed to be set to -1 at this point */
623 if (session->consumer_fd < 0) {
3bd1e081 624 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
625 }
626
03550b58 627 if (session->metadata_stream_fd >= 0) {
3bd1e081
MD
628 /* Send metadata channel fd */
629 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
630 lkm.u.channel.channel_key = session->metadata->fd;
631 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
632 lkm.u.channel.mmap_len = 0; /* for kernel */
032b44f0 633 DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081
MD
634 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
635 if (ret < 0) {
76d7553f 636 PERROR("send consumer channel");
3bd1e081
MD
637 goto error;
638 }
639
640 /* Send metadata stream fd */
641 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
642 lkm.u.stream.channel_key = session->metadata->fd;
643 lkm.u.stream.stream_key = session->metadata_stream_fd;
644 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
645 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
646 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD
647 lkm.u.stream.uid = session->uid;
648 lkm.u.stream.gid = session->gid;
3bd1e081
MD
649 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
650 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
651 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
652 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
653 if (ret < 0) {
76d7553f 654 PERROR("send consumer stream");
3bd1e081
MD
655 goto error;
656 }
657 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 658 if (ret < 0) {
76d7553f 659 PERROR("send consumer stream");
7a485870
DG
660 goto error;
661 }
662 }
f3ed775e 663
f3ed775e 664 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD
665 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
666 session->uid, session->gid);
2bdd86d4
MD
667 if (ret < 0) {
668 goto error;
669 }
670 }
671
672 DBG("consumer fds (metadata and channel streams) sent");
673
674 return 0;
675
676error:
677 return ret;
678}
679
fac6795d 680/*
0fdd1e2c 681 * Notify UST applications using the shm mmap futex.
fac6795d 682 */
0fdd1e2c 683static int notify_ust_apps(int active)
fac6795d 684{
0fdd1e2c 685 char *wait_shm_mmap;
fac6795d 686
0fdd1e2c 687 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 688
0fdd1e2c
DG
689 /* See shm.c for this call implying mmap, shm and futex calls */
690 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
691 if (wait_shm_mmap == NULL) {
fac6795d
DG
692 goto error;
693 }
694
0fdd1e2c
DG
695 /* Wake waiting process */
696 futex_wait_update((int32_t *) wait_shm_mmap, active);
697
698 /* Apps notified successfully */
699 return 0;
fac6795d
DG
700
701error:
0fdd1e2c 702 return -1;
fac6795d
DG
703}
704
e065084a 705/*
d063d709
DG
706 * Setup the outgoing data buffer for the response (llm) by allocating the
707 * right amount of memory and copying the original information from the lsm
708 * structure.
ca95a216 709 *
d063d709 710 * Return total size of the buffer pointed by buf.
ca95a216 711 */
5461b305 712static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 713{
f3ed775e 714 int ret, buf_size;
ca95a216 715
f3ed775e 716 buf_size = size;
5461b305 717
ba7f0ae5 718 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 719 if (cmd_ctx->llm == NULL) {
76d7553f 720 PERROR("zmalloc");
5461b305 721 ret = -ENOMEM;
ca95a216
DG
722 goto error;
723 }
724
5461b305
DG
725 /* Copy common data */
726 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 727 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 728
5461b305
DG
729 cmd_ctx->llm->data_size = size;
730 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
731
ca95a216
DG
732 return buf_size;
733
734error:
735 return ret;
736}
737
7a485870 738/*
5eb91c98 739 * Update the kernel poll set of all channel fd available over all tracing
d063d709 740 * session. Add the wakeup pipe at the end of the set.
7a485870 741 */
5eb91c98 742static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 743{
5eb91c98 744 int ret;
7a485870
DG
745 struct ltt_session *session;
746 struct ltt_kernel_channel *channel;
747
5eb91c98 748 DBG("Updating kernel poll set");
7a485870 749
54d01ffb 750 session_lock_list();
b5541356 751 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 752 session_lock(session);
7a485870 753 if (session->kernel_session == NULL) {
54d01ffb 754 session_unlock(session);
7a485870
DG
755 continue;
756 }
7a485870 757
54d01ffb
DG
758 cds_list_for_each_entry(channel,
759 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG
760 /* Add channel fd to the kernel poll set */
761 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
762 if (ret < 0) {
54d01ffb 763 session_unlock(session);
5eb91c98
DG
764 goto error;
765 }
766 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 767 }
54d01ffb 768 session_unlock(session);
7a485870 769 }
54d01ffb 770 session_unlock_list();
7a485870 771
5eb91c98 772 return 0;
7a485870
DG
773
774error:
54d01ffb 775 session_unlock_list();
7a485870
DG
776 return -1;
777}
778
779/*
54d01ffb 780 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 781 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 782 *
d063d709 783 * Useful for CPU hotplug feature.
7a485870 784 */
2bdd86d4 785static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG
786{
787 int ret = 0;
788 struct ltt_session *session;
789 struct ltt_kernel_channel *channel;
790
791 DBG("Updating kernel streams for channel fd %d", fd);
792
54d01ffb 793 session_lock_list();
b5541356 794 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 795 session_lock(session);
7a485870 796 if (session->kernel_session == NULL) {
54d01ffb 797 session_unlock(session);
7a485870
DG
798 continue;
799 }
d9800920 800
03550b58
MD
801 /* This is not suppose to be -1 but this is an extra security check */
802 if (session->kernel_session->consumer_fd < 0) {
3bd1e081 803 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG
804 }
805
5eb91c98
DG
806 cds_list_for_each_entry(channel,
807 &session->kernel_session->channel_list.head, list) {
7a485870
DG
808 if (channel->fd == fd) {
809 DBG("Channel found, updating kernel streams");
810 ret = kernel_open_channel_stream(channel);
811 if (ret < 0) {
b3c750d2 812 goto error;
7a485870 813 }
d9800920 814
7a485870 815 /*
5eb91c98
DG
816 * Have we already sent fds to the consumer? If yes, it means
817 * that tracing is started so it is safe to send our updated
818 * stream fds.
7a485870 819 */
3bd1e081 820 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 821 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD
822 session->kernel_session->consumer_fd, channel,
823 session->uid, session->gid);
7a485870 824 if (ret < 0) {
b3c750d2 825 goto error;
7a485870
DG
826 }
827 }
b3c750d2 828 goto error;
7a485870
DG
829 }
830 }
54d01ffb 831 session_unlock(session);
7a485870 832 }
54d01ffb 833 session_unlock_list();
b3c750d2 834 return ret;
7a485870 835
b3c750d2 836error:
54d01ffb
DG
837 session_unlock(session);
838 session_unlock_list();
7a485870
DG
839 return ret;
840}
841
487cf67c
DG
842/*
843 * For each tracing session, update newly registered apps.
844 */
845static void update_ust_app(int app_sock)
846{
847 struct ltt_session *sess, *stmp;
848
4ee14516
DG
849 session_lock_list();
850
487cf67c
DG
851 /* For all tracing session(s) */
852 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 853 session_lock(sess);
421cb601
DG
854 if (sess->ust_session) {
855 ust_app_global_update(sess->ust_session, app_sock);
856 }
4ee14516 857 session_unlock(sess);
487cf67c 858 }
4ee14516
DG
859
860 session_unlock_list();
487cf67c
DG
861}
862
7a485870 863/*
d063d709 864 * This thread manage event coming from the kernel.
7a485870 865 *
d063d709
DG
866 * Features supported in this thread:
867 * -) CPU Hotplug
7a485870
DG
868 */
869static void *thread_manage_kernel(void *data)
870{
5eb91c98
DG
871 int ret, i, pollfd, update_poll_flag = 1;
872 uint32_t revents, nb_fd;
7a485870 873 char tmp;
5eb91c98 874 struct lttng_poll_event events;
7a485870
DG
875
876 DBG("Thread manage kernel started");
877
5eb91c98
DG
878 ret = create_thread_poll_set(&events, 2);
879 if (ret < 0) {
76d7553f 880 goto error_poll_create;
5eb91c98
DG
881 }
882
883 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
884 if (ret < 0) {
885 goto error;
886 }
887
7a485870
DG
888 while (1) {
889 if (update_poll_flag == 1) {
5f822d0a
DG
890 /*
891 * Reset number of fd in the poll set. Always 2 since there is the thread
892 * quit pipe and the kernel pipe.
893 */
894 events.nb_fd = 2;
895
5eb91c98
DG
896 ret = update_kernel_poll(&events);
897 if (ret < 0) {
7a485870
DG
898 goto error;
899 }
900 update_poll_flag = 0;
901 }
902
5eb91c98
DG
903 nb_fd = LTTNG_POLL_GETNB(&events);
904
905 DBG("Thread kernel polling on %d fds", nb_fd);
906
907 /* Zeroed the poll events */
908 lttng_poll_reset(&events);
7a485870
DG
909
910 /* Poll infinite value of time */
88f2b785 911 restart:
5eb91c98 912 ret = lttng_poll_wait(&events, -1);
7a485870 913 if (ret < 0) {
88f2b785
MD
914 /*
915 * Restart interrupted system call.
916 */
917 if (errno == EINTR) {
918 goto restart;
919 }
7a485870
DG
920 goto error;
921 } else if (ret == 0) {
922 /* Should not happen since timeout is infinite */
85611738
DG
923 ERR("Return value of poll is 0 with an infinite timeout.\n"
924 "This should not have happened! Continuing...");
7a485870
DG
925 continue;
926 }
927
5eb91c98
DG
928 for (i = 0; i < nb_fd; i++) {
929 /* Fetch once the poll data */
930 revents = LTTNG_POLL_GETEV(&events, i);
931 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 932
5eb91c98
DG
933 /* Thread quit pipe has been closed. Killing thread. */
934 ret = check_thread_quit_pipe(pollfd, revents);
935 if (ret) {
936 goto error;
937 }
7a485870 938
5eb91c98
DG
939 /* Check for data on kernel pipe */
940 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
941 ret = read(kernel_poll_pipe[0], &tmp, 1);
942 update_poll_flag = 1;
943 continue;
944 } else {
945 /*
946 * New CPU detected by the kernel. Adding kernel stream to
947 * kernel session and updating the kernel consumer
948 */
949 if (revents & LPOLLIN) {
2bdd86d4 950 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG
951 if (ret < 0) {
952 continue;
953 }
954 break;
955 /*
956 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
957 * and unregister kernel stream at this point.
958 */
7a485870 959 }
7a485870
DG
960 }
961 }
962 }
963
964error:
5eb91c98 965 lttng_poll_clean(&events);
76d7553f
MD
966error_poll_create:
967 DBG("Kernel thread dying");
7a485870
DG
968 return NULL;
969}
970
1d4b027a 971/*
3bd1e081 972 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 973 */
3bd1e081 974static void *thread_manage_consumer(void *data)
1d4b027a 975{
76d7553f 976 int sock = -1, i, ret, pollfd;
5eb91c98 977 uint32_t revents, nb_fd;
1d4b027a 978 enum lttcomm_return_code code;
5eb91c98 979 struct lttng_poll_event events;
3bd1e081 980 struct consumer_data *consumer_data = data;
1d4b027a 981
3bd1e081 982 DBG("[thread] Manage consumer started");
1d4b027a 983
3bd1e081 984 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a 985 if (ret < 0) {
76d7553f 986 goto error_listen;
1d4b027a
DG
987 }
988
5eb91c98
DG
989 /*
990 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
991 * Nothing more will be added to this poll set.
992 */
993 ret = create_thread_poll_set(&events, 2);
994 if (ret < 0) {
76d7553f 995 goto error_poll;
5eb91c98 996 }
273ea72c 997
3bd1e081 998 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG
999 if (ret < 0) {
1000 goto error;
1001 }
1002
1003 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG
1004
1005 /* Inifinite blocking call, waiting for transmission */
88f2b785 1006restart:
5eb91c98 1007 ret = lttng_poll_wait(&events, -1);
273ea72c 1008 if (ret < 0) {
88f2b785
MD
1009 /*
1010 * Restart interrupted system call.
1011 */
1012 if (errno == EINTR) {
1013 goto restart;
1014 }
273ea72c
DG
1015 goto error;
1016 }
1017
5eb91c98
DG
1018 for (i = 0; i < nb_fd; i++) {
1019 /* Fetch once the poll data */
1020 revents = LTTNG_POLL_GETEV(&events, i);
1021 pollfd = LTTNG_POLL_GETFD(&events, i);
1022
1023 /* Thread quit pipe has been closed. Killing thread. */
1024 ret = check_thread_quit_pipe(pollfd, revents);
1025 if (ret) {
1026 goto error;
1027 }
1028
1029 /* Event on the registration socket */
3bd1e081 1030 if (pollfd == consumer_data->err_sock) {
5eb91c98 1031 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1032 ERR("consumer err socket poll error");
5eb91c98
DG
1033 goto error;
1034 }
1035 }
273ea72c
DG
1036 }
1037
3bd1e081 1038 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG
1039 if (sock < 0) {
1040 goto error;
1041 }
1042
3bd1e081 1043 DBG2("Receiving code from consumer err_sock");
ee0b0061 1044
712ea556 1045 /* Getting status code from kconsumerd */
54d01ffb
DG
1046 ret = lttcomm_recv_unix_sock(sock, &code,
1047 sizeof(enum lttcomm_return_code));
1d4b027a
DG
1048 if (ret <= 0) {
1049 goto error;
1050 }
1051
3bd1e081
MD
1052 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1053 consumer_data->cmd_sock =
1054 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1055 if (consumer_data->cmd_sock < 0) {
1056 sem_post(&consumer_data->sem);
48842b30 1057 PERROR("consumer connect");
1d4b027a
DG
1058 goto error;
1059 }
1060 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD
1061 sem_post(&consumer_data->sem);
1062 DBG("consumer command socket ready");
1d4b027a 1063 } else {
3bd1e081 1064 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG
1065 lttcomm_get_readable_code(-code));
1066 goto error;
1067 }
1068
54d01ffb 1069 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1070 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1071 if (ret < 0) {
72079cae
DG
1072 goto error;
1073 }
1074
5eb91c98
DG
1075 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1076 if (ret < 0) {
72079cae 1077 goto error;
5eb91c98
DG
1078 }
1079
1080 /* Update number of fd */
1081 nb_fd = LTTNG_POLL_GETNB(&events);
1082
1083 /* Inifinite blocking call, waiting for transmission */
88f2b785 1084restart_poll:
5eb91c98
DG
1085 ret = lttng_poll_wait(&events, -1);
1086 if (ret < 0) {
88f2b785
MD
1087 /*
1088 * Restart interrupted system call.
1089 */
1090 if (errno == EINTR) {
1091 goto restart_poll;
1092 }
72079cae
DG
1093 goto error;
1094 }
1095
5eb91c98
DG
1096 for (i = 0; i < nb_fd; i++) {
1097 /* Fetch once the poll data */
1098 revents = LTTNG_POLL_GETEV(&events, i);
1099 pollfd = LTTNG_POLL_GETFD(&events, i);
1100
1101 /* Thread quit pipe has been closed. Killing thread. */
1102 ret = check_thread_quit_pipe(pollfd, revents);
1103 if (ret) {
1104 goto error;
1105 }
1106
1107 /* Event on the kconsumerd socket */
1108 if (pollfd == sock) {
1109 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1110 ERR("consumer err socket second poll error");
5eb91c98
DG
1111 goto error;
1112 }
1113 }
1114 }
1115
712ea556 1116 /* Wait for any kconsumerd error */
54d01ffb
DG
1117 ret = lttcomm_recv_unix_sock(sock, &code,
1118 sizeof(enum lttcomm_return_code));
712ea556 1119 if (ret <= 0) {
3bd1e081 1120 ERR("consumer closed the command socket");
712ea556 1121 goto error;
6f61d021 1122 }
1d4b027a 1123
3bd1e081 1124 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1125
1d4b027a 1126error:
5c827ce0
DG
1127 /* Immediately set the consumerd state to stopped */
1128 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1129 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1130 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1131 consumer_data->type == LTTNG_CONSUMER32_UST) {
1132 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1133 } else {
1134 /* Code flow error... */
1135 assert(0);
1136 }
1137
76d7553f
MD
1138 if (consumer_data->err_sock >= 0) {
1139 ret = close(consumer_data->err_sock);
1140 if (ret) {
1141 PERROR("close");
1142 }
1143 }
1144 if (consumer_data->cmd_sock >= 0) {
1145 ret = close(consumer_data->cmd_sock);
1146 if (ret) {
1147 PERROR("close");
1148 }
1149 }
1150 if (sock >= 0) {
1151 ret = close(sock);
1152 if (ret) {
1153 PERROR("close");
1154 }
1155 }
273ea72c 1156
3bd1e081
MD
1157 unlink(consumer_data->err_unix_sock_path);
1158 unlink(consumer_data->cmd_unix_sock_path);
1159 consumer_data->pid = 0;
1d4b027a 1160
5eb91c98 1161 lttng_poll_clean(&events);
76d7553f
MD
1162error_poll:
1163error_listen:
1164 DBG("consumer thread cleanup completed");
0177d773 1165
5eb91c98 1166 return NULL;
099e26bd
DG
1167}
1168
099e26bd
DG
1169/*
1170 * This thread manage application communication.
1d4b027a
DG
1171 */
1172static void *thread_manage_apps(void *data)
099e26bd 1173{
5eb91c98
DG
1174 int i, ret, pollfd;
1175 uint32_t revents, nb_fd;
099e26bd 1176 struct ust_command ust_cmd;
5eb91c98 1177 struct lttng_poll_event events;
099e26bd
DG
1178
1179 DBG("[thread] Manage application started");
1180
f6a9efaa
DG
1181 rcu_register_thread();
1182 rcu_thread_online();
1183
5eb91c98
DG
1184 ret = create_thread_poll_set(&events, 2);
1185 if (ret < 0) {
76d7553f 1186 goto error_poll_create;
5eb91c98 1187 }
099e26bd 1188
5eb91c98
DG
1189 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1190 if (ret < 0) {
1191 goto error;
1192 }
099e26bd 1193
5eb91c98
DG
1194 while (1) {
1195 /* Zeroed the events structure */
1196 lttng_poll_reset(&events);
0177d773 1197
5eb91c98 1198 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG
1199
1200 DBG("Apps thread polling on %d fds", nb_fd);
1201
1202 /* Inifinite blocking call, waiting for transmission */
88f2b785 1203 restart:
5eb91c98 1204 ret = lttng_poll_wait(&events, -1);
099e26bd 1205 if (ret < 0) {
88f2b785
MD
1206 /*
1207 * Restart interrupted system call.
1208 */
1209 if (errno == EINTR) {
1210 goto restart;
1211 }
099e26bd
DG
1212 goto error;
1213 }
1214
5eb91c98
DG
1215 for (i = 0; i < nb_fd; i++) {
1216 /* Fetch once the poll data */
1217 revents = LTTNG_POLL_GETEV(&events, i);
1218 pollfd = LTTNG_POLL_GETFD(&events, i);
1219
1220 /* Thread quit pipe has been closed. Killing thread. */
1221 ret = check_thread_quit_pipe(pollfd, revents);
1222 if (ret) {
099e26bd 1223 goto error;
5eb91c98 1224 }
099e26bd 1225
5eb91c98
DG
1226 /* Inspect the apps cmd pipe */
1227 if (pollfd == apps_cmd_pipe[0]) {
1228 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1229 ERR("Apps command pipe error");
0177d773 1230 goto error;
5eb91c98
DG
1231 } else if (revents & LPOLLIN) {
1232 /* Empty pipe */
1233 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1234 if (ret < 0 || ret < sizeof(ust_cmd)) {
76d7553f 1235 PERROR("read apps cmd pipe");
5eb91c98
DG
1236 goto error;
1237 }
099e26bd 1238
5eb91c98 1239 /* Register applicaton to the session daemon */
56fff090 1240 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1241 ust_cmd.sock);
88ff5b7f 1242 if (ret == -ENOMEM) {
5eb91c98 1243 goto error;
88ff5b7f
MD
1244 } else if (ret < 0) {
1245 break;
5eb91c98
DG
1246 }
1247
acc7b41b 1248 /*
e0c7ec2b 1249 * Validate UST version compatibility.
acc7b41b 1250 */
e0c7ec2b
DG
1251 ret = ust_app_validate_version(ust_cmd.sock);
1252 if (ret >= 0) {
1253 /*
1254 * Add channel(s) and event(s) to newly registered apps
1255 * from lttng global UST domain.
1256 */
1257 update_ust_app(ust_cmd.sock);
1258 }
acc7b41b 1259
f2ca2e25 1260 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG
1261 if (ret < 0) {
1262 /*
1263 * If the registration is not possible, we simply
1264 * unregister the apps and continue
1265 */
56fff090 1266 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG
1267 } else {
1268 /*
1269 * We just need here to monitor the close of the UST
1270 * socket and poll set monitor those by default.
a9ade966
MD
1271 * Listen on POLLIN (even if we never expect any
1272 * data) to ensure that hangup wakes us.
5eb91c98 1273 */
a9ade966 1274 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
5eb91c98
DG
1275 if (ret < 0) {
1276 goto error;
1277 }
1278
54d01ffb
DG
1279 DBG("Apps with sock %d added to poll set",
1280 ust_cmd.sock);
5eb91c98 1281 }
487cf67c 1282
5eb91c98 1283 break;
0177d773 1284 }
5eb91c98
DG
1285 } else {
1286 /*
54d01ffb
DG
1287 * At this point, we know that a registered application made
1288 * the event at poll_wait.
5eb91c98
DG
1289 */
1290 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1291 /* Removing from the poll set */
1292 ret = lttng_poll_del(&events, pollfd);
1293 if (ret < 0) {
1294 goto error;
1295 }
099e26bd 1296
b9d9b220 1297 /* Socket closed on remote end. */
56fff090 1298 ust_app_unregister(pollfd);
5eb91c98
DG
1299 break;
1300 }
099e26bd
DG
1301 }
1302 }
099e26bd
DG
1303 }
1304
1305error:
5eb91c98 1306 lttng_poll_clean(&events);
76d7553f
MD
1307error_poll_create:
1308 DBG("Application communication apps thread cleanup complete");
f6a9efaa
DG
1309 rcu_thread_offline();
1310 rcu_unregister_thread();
099e26bd
DG
1311 return NULL;
1312}
1313
1314/*
1315 * Dispatch request from the registration threads to the application
1316 * communication thread.
1317 */
1318static void *thread_dispatch_ust_registration(void *data)
1319{
1320 int ret;
1321 struct cds_wfq_node *node;
1322 struct ust_command *ust_cmd = NULL;
1323
1324 DBG("[thread] Dispatch UST command started");
1325
1326 while (!dispatch_thread_exit) {
1327 /* Atomically prepare the queue futex */
1328 futex_nto1_prepare(&ust_cmd_queue.futex);
1329
1330 do {
1331 /* Dequeue command for registration */
1332 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1333 if (node == NULL) {
00a17c97 1334 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG
1335 /* Continue thread execution */
1336 break;
1337 }
1338
1339 ust_cmd = caa_container_of(node, struct ust_command, node);
1340
2f50c8a3
DG
1341 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1342 " gid:%d sock:%d name:%s (version %d.%d)",
1343 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1344 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1345 ust_cmd->sock, ust_cmd->reg_msg.name,
1346 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG
1347 /*
1348 * Inform apps thread of the new application registration. This
1349 * call is blocking so we can be assured that the data will be read
1350 * at some point in time or wait to the end of the world :)
1351 */
1352 ret = write(apps_cmd_pipe[1], ust_cmd,
1353 sizeof(struct ust_command));
1354 if (ret < 0) {
76d7553f 1355 PERROR("write apps cmd pipe");
099e26bd
DG
1356 if (errno == EBADF) {
1357 /*
1358 * We can't inform the application thread to process
1359 * registration. We will exit or else application
1360 * registration will not occur and tracing will never
1361 * start.
1362 */
1363 goto error;
1364 }
1365 }
1366 free(ust_cmd);
1367 } while (node != NULL);
1368
1369 /* Futex wait on queue. Blocking call on futex() */
1370 futex_nto1_wait(&ust_cmd_queue.futex);
1371 }
1372
1373error:
1374 DBG("Dispatch thread dying");
1375 return NULL;
1376}
1377
1378/*
1379 * This thread manage application registration.
1380 */
1381static void *thread_registration_apps(void *data)
1d4b027a 1382{
a4b35e07 1383 int sock = -1, i, ret, pollfd;
5eb91c98
DG
1384 uint32_t revents, nb_fd;
1385 struct lttng_poll_event events;
099e26bd
DG
1386 /*
1387 * Get allocated in this thread, enqueued to a global queue, dequeued and
1388 * freed in the manage apps thread.
1389 */
1390 struct ust_command *ust_cmd = NULL;
1d4b027a 1391
099e26bd 1392 DBG("[thread] Manage application registration started");
1d4b027a
DG
1393
1394 ret = lttcomm_listen_unix_sock(apps_sock);
1395 if (ret < 0) {
76d7553f 1396 goto error_listen;
1d4b027a
DG
1397 }
1398
5eb91c98
DG
1399 /*
1400 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1401 * more will be added to this poll set.
1402 */
1403 ret = create_thread_poll_set(&events, 2);
1404 if (ret < 0) {
76d7553f 1405 goto error_create_poll;
5eb91c98 1406 }
273ea72c 1407
5eb91c98
DG
1408 /* Add the application registration socket */
1409 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1410 if (ret < 0) {
76d7553f 1411 goto error_poll_add;
5eb91c98 1412 }
273ea72c 1413
1d4b027a 1414 /* Notify all applications to register */
0fdd1e2c
DG
1415 ret = notify_ust_apps(1);
1416 if (ret < 0) {
1417 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG
1418 "Execution continues but there might be problem for already\n"
1419 "running applications that wishes to register.");
0fdd1e2c 1420 }
1d4b027a
DG
1421
1422 while (1) {
1423 DBG("Accepting application registration");
273ea72c 1424
5eb91c98
DG
1425 nb_fd = LTTNG_POLL_GETNB(&events);
1426
273ea72c 1427 /* Inifinite blocking call, waiting for transmission */
88f2b785 1428 restart:
5eb91c98 1429 ret = lttng_poll_wait(&events, -1);
273ea72c 1430 if (ret < 0) {
88f2b785
MD
1431 /*
1432 * Restart interrupted system call.
1433 */
1434 if (errno == EINTR) {
1435 goto restart;
1436 }
273ea72c
DG
1437 goto error;
1438 }
1439
5eb91c98
DG
1440 for (i = 0; i < nb_fd; i++) {
1441 /* Fetch once the poll data */
1442 revents = LTTNG_POLL_GETEV(&events, i);
1443 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1444
5eb91c98
DG
1445 /* Thread quit pipe has been closed. Killing thread. */
1446 ret = check_thread_quit_pipe(pollfd, revents);
1447 if (ret) {
90014c57
DG
1448 goto error;
1449 }
1d4b027a 1450
5eb91c98
DG
1451 /* Event on the registration socket */
1452 if (pollfd == apps_sock) {
1453 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1454 ERR("Register apps socket poll error");
1455 goto error;
1456 } else if (revents & LPOLLIN) {
1457 sock = lttcomm_accept_unix_sock(apps_sock);
1458 if (sock < 0) {
1459 goto error;
1460 }
099e26bd 1461
5eb91c98 1462 /* Create UST registration command for enqueuing */
ba7f0ae5 1463 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1464 if (ust_cmd == NULL) {
76d7553f 1465 PERROR("ust command zmalloc");
5eb91c98
DG
1466 goto error;
1467 }
1d4b027a 1468
5eb91c98
DG
1469 /*
1470 * Using message-based transmissions to ensure we don't
1471 * have to deal with partially received messages.
1472 */
4063050c
MD
1473 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1474 if (ret < 0) {
1475 ERR("Exhausted file descriptors allowed for applications.");
1476 free(ust_cmd);
1477 ret = close(sock);
1478 if (ret) {
1479 PERROR("close");
1480 }
1481 sock = -1;
1482 continue;
1483 }
5eb91c98
DG
1484 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1485 sizeof(struct ust_register_msg));
1486 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1487 if (ret < 0) {
76d7553f 1488 PERROR("lttcomm_recv_unix_sock register apps");
5eb91c98
DG
1489 } else {
1490 ERR("Wrong size received on apps register");
1491 }
1492 free(ust_cmd);
76d7553f
MD
1493 ret = close(sock);
1494 if (ret) {
1495 PERROR("close");
1496 }
4063050c 1497 lttng_fd_put(LTTNG_FD_APPS, 1);
76d7553f 1498 sock = -1;
5eb91c98
DG
1499 continue;
1500 }
099e26bd 1501
5eb91c98 1502 ust_cmd->sock = sock;
34a2494f 1503 sock = -1;
099e26bd 1504
5eb91c98
DG
1505 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1506 " gid:%d sock:%d name:%s (version %d.%d)",
1507 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1508 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1509 ust_cmd->sock, ust_cmd->reg_msg.name,
1510 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1511
5eb91c98
DG
1512 /*
1513 * Lock free enqueue the registration request. The red pill
54d01ffb 1514 * has been taken! This apps will be part of the *system*.
5eb91c98
DG
1515 */
1516 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1517
1518 /*
1519 * Wake the registration queue futex. Implicit memory
1520 * barrier with the exchange in cds_wfq_enqueue.
1521 */
1522 futex_nto1_wake(&ust_cmd_queue.futex);
1523 }
1524 }
90014c57 1525 }
1d4b027a
DG
1526 }
1527
1528error:
0fdd1e2c
DG
1529 /* Notify that the registration thread is gone */
1530 notify_ust_apps(0);
1531
a4b35e07 1532 if (apps_sock >= 0) {
76d7553f
MD
1533 ret = close(apps_sock);
1534 if (ret) {
1535 PERROR("close");
1536 }
a4b35e07 1537 }
46c3f085 1538 if (sock >= 0) {
76d7553f
MD
1539 ret = close(sock);
1540 if (ret) {
1541 PERROR("close");
1542 }
4063050c 1543 lttng_fd_put(LTTNG_FD_APPS, 1);
a4b35e07 1544 }
273ea72c 1545 unlink(apps_unix_sock_path);
0fdd1e2c 1546
76d7553f 1547error_poll_add:
5eb91c98 1548 lttng_poll_clean(&events);
76d7553f
MD
1549error_listen:
1550error_create_poll:
1551 DBG("UST Registration thread cleanup complete");
5eb91c98 1552
1d4b027a
DG
1553 return NULL;
1554}
1555
8c0faa1d 1556/*
3bd1e081 1557 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1558 * exec or it will fails.
8c0faa1d 1559 */
3bd1e081 1560static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG
1561{
1562 int ret;
ee0b0061
DG
1563 struct timespec timeout;
1564
1565 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1566 timeout.tv_nsec = 0;
8c0faa1d
DG
1567
1568 /* Setup semaphore */
3bd1e081 1569 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1570 if (ret < 0) {
3bd1e081 1571 PERROR("sem_init consumer semaphore");
ee0b0061
DG
1572 goto error;
1573 }
8c0faa1d 1574
3bd1e081
MD
1575 ret = pthread_create(&consumer_data->thread, NULL,
1576 thread_manage_consumer, consumer_data);
8c0faa1d 1577 if (ret != 0) {
3bd1e081 1578 PERROR("pthread_create consumer");
ee0b0061 1579 ret = -1;
8c0faa1d
DG
1580 goto error;
1581 }
1582
ee0b0061
DG
1583 /* Get time for sem_timedwait absolute timeout */
1584 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1585 if (ret < 0) {
3bd1e081 1586 PERROR("clock_gettime spawn consumer");
ee0b0061 1587 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1588 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG
1589 } else {
1590 /* Normal timeout if the gettime was successful */
1591 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1592 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1593 }
8c0faa1d 1594
ee0b0061
DG
1595 if (ret < 0) {
1596 if (errno == ETIMEDOUT) {
1597 /*
1598 * Call has timed out so we kill the kconsumerd_thread and return
1599 * an error.
1600 */
3bd1e081
MD
1601 ERR("The consumer thread was never ready. Killing it");
1602 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1603 if (ret < 0) {
3bd1e081 1604 PERROR("pthread_cancel consumer thread");
ee0b0061
DG
1605 }
1606 } else {
3bd1e081 1607 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG
1608 }
1609 goto error;
1610 }
1611
3bd1e081
MD
1612 pthread_mutex_lock(&consumer_data->pid_mutex);
1613 if (consumer_data->pid == 0) {
712ea556 1614 ERR("Kconsumerd did not start");
3bd1e081 1615 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG
1616 goto error;
1617 }
3bd1e081 1618 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1619
8c0faa1d
DG
1620 return 0;
1621
1622error:
1623 return ret;
1624}
1625
d9800920 1626/*
3bd1e081 1627 * Join consumer thread
d9800920 1628 */
3bd1e081 1629static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD
1630{
1631 void *status;
1632 int ret;
1633
3bd1e081
MD
1634 if (consumer_data->pid != 0) {
1635 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1636 if (ret) {
3bd1e081 1637 ERR("Error killing consumer daemon");
cf3af59e
MD
1638 return ret;
1639 }
3bd1e081 1640 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD
1641 } else {
1642 return 0;
1643 }
1644}
1645
8c0faa1d 1646/*
3bd1e081 1647 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1648 *
d063d709 1649 * Return pid if successful else -1.
8c0faa1d 1650 */
3bd1e081 1651static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG
1652{
1653 int ret;
1654 pid_t pid;
94c55f17 1655 const char *consumer_to_use;
53086306 1656 const char *verbosity;
94c55f17 1657 struct stat st;
8c0faa1d 1658
3bd1e081 1659 DBG("Spawning consumerd");
c49dc785 1660
8c0faa1d
DG
1661 pid = fork();
1662 if (pid == 0) {
1663 /*
3bd1e081 1664 * Exec consumerd.
8c0faa1d 1665 */
daee5345 1666 if (opt_verbose_consumer) {
53086306
DG
1667 verbosity = "--verbose";
1668 } else {
1669 verbosity = "--quiet";
1670 }
3bd1e081
MD
1671 switch (consumer_data->type) {
1672 case LTTNG_CONSUMER_KERNEL:
94c55f17 1673 /*
c7704d57
DG
1674 * Find out which consumerd to execute. We will first try the
1675 * 64-bit path, then the sessiond's installation directory, and
1676 * fallback on the 32-bit one,
94c55f17 1677 */
63a799e8
AM
1678 DBG3("Looking for a kernel consumer at these locations:");
1679 DBG3(" 1) %s", consumerd64_bin);
1680 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1681 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1682 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1683 DBG3("Found location #1");
94c55f17 1684 consumer_to_use = consumerd64_bin;
94c55f17 1685 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1686 DBG3("Found location #2");
94c55f17 1687 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1688 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1689 DBG3("Found location #3");
eb1e0bd4 1690 consumer_to_use = consumerd32_bin;
94c55f17 1691 } else {
63a799e8 1692 DBG("Could not find any valid consumerd executable");
94c55f17
AM
1693 break;
1694 }
1695 DBG("Using kernel consumer at: %s", consumer_to_use);
1696 execl(consumer_to_use,
1697 "lttng-consumerd", verbosity, "-k",
1698 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1699 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1700 NULL);
3bd1e081 1701 break;
7753dea8
MD
1702 case LTTNG_CONSUMER64_UST:
1703 {
b1e0b6b6 1704 char *tmpnew = NULL;
8f4905da
MD
1705
1706 if (consumerd64_libdir[0] != '\0') {
1707 char *tmp;
1708 size_t tmplen;
1709
1710 tmp = getenv("LD_LIBRARY_PATH");
1711 if (!tmp) {
1712 tmp = "";
1713 }
1714 tmplen = strlen("LD_LIBRARY_PATH=")
1715 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1716 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1717 if (!tmpnew) {
1718 ret = -ENOMEM;
1719 goto error;
1720 }
1721 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1722 strcat(tmpnew, consumerd64_libdir);
1723 if (tmp[0] != '\0') {
1724 strcat(tmpnew, ":");
1725 strcat(tmpnew, tmp);
1726 }
1727 ret = putenv(tmpnew);
1728 if (ret) {
1729 ret = -errno;
1730 goto error;
1731 }
1732 }
94c55f17 1733 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1734 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1735 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1736 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1737 NULL);
8f4905da
MD
1738 if (consumerd64_libdir[0] != '\0') {
1739 free(tmpnew);
1740 }
1741 if (ret) {
1742 goto error;
1743 }
3bd1e081 1744 break;
7753dea8
MD
1745 }
1746 case LTTNG_CONSUMER32_UST:
1747 {
937dde8e 1748 char *tmpnew = NULL;
8f4905da
MD
1749
1750 if (consumerd32_libdir[0] != '\0') {
1751 char *tmp;
1752 size_t tmplen;
1753
1754 tmp = getenv("LD_LIBRARY_PATH");
1755 if (!tmp) {
1756 tmp = "";
1757 }
1758 tmplen = strlen("LD_LIBRARY_PATH=")
1759 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1760 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1761 if (!tmpnew) {
1762 ret = -ENOMEM;
1763 goto error;
1764 }
1765 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1766 strcat(tmpnew, consumerd32_libdir);
1767 if (tmp[0] != '\0') {
1768 strcat(tmpnew, ":");
1769 strcat(tmpnew, tmp);
1770 }
1771 ret = putenv(tmpnew);
1772 if (ret) {
1773 ret = -errno;
1774 goto error;
1775 }
1776 }
94c55f17 1777 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1778 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD
1779 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1780 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1781 NULL);
8f4905da
MD
1782 if (consumerd32_libdir[0] != '\0') {
1783 free(tmpnew);
1784 }
1785 if (ret) {
1786 goto error;
1787 }
7753dea8
MD
1788 break;
1789 }
3bd1e081 1790 default:
76d7553f 1791 PERROR("unknown consumer type");
3bd1e081
MD
1792 exit(EXIT_FAILURE);
1793 }
8c0faa1d 1794 if (errno != 0) {
76d7553f 1795 PERROR("kernel start consumer exec");
8c0faa1d
DG
1796 }
1797 exit(EXIT_FAILURE);
1798 } else if (pid > 0) {
1799 ret = pid;
8c0faa1d 1800 } else {
76d7553f 1801 PERROR("start consumer fork");
8c0faa1d 1802 ret = -errno;
8c0faa1d 1803 }
8f4905da 1804error:
8c0faa1d
DG
1805 return ret;
1806}
1807
693bd40b 1808/*
3bd1e081 1809 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1810 */
3bd1e081 1811static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG
1812{
1813 int ret;
1814
3bd1e081
MD
1815 pthread_mutex_lock(&consumer_data->pid_mutex);
1816 if (consumer_data->pid != 0) {
1817 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG
1818 goto end;
1819 }
693bd40b 1820
3bd1e081 1821 ret = spawn_consumerd(consumer_data);
c49dc785 1822 if (ret < 0) {
3bd1e081
MD
1823 ERR("Spawning consumerd failed");
1824 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1825 goto error;
693bd40b 1826 }
c49dc785 1827
3bd1e081
MD
1828 /* Setting up the consumer_data pid */
1829 consumer_data->pid = ret;
48842b30 1830 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1831 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1832
3bd1e081
MD
1833 DBG2("Spawning consumer control thread");
1834 ret = spawn_consumer_thread(consumer_data);
693bd40b 1835 if (ret < 0) {
3bd1e081 1836 ERR("Fatal error spawning consumer control thread");
693bd40b
DG
1837 goto error;
1838 }
1839
c49dc785 1840end:
693bd40b
DG
1841 return 0;
1842
1843error:
1844 return ret;
1845}
1846
b73401da 1847/*
096102bd 1848 * Check version of the lttng-modules.
b73401da 1849 */
096102bd 1850static int validate_lttng_modules_version(void)
b73401da 1851{
096102bd 1852 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD
1853}
1854
b73401da 1855/*
096102bd 1856 * Setup necessary data for kernel tracer action.
b73401da 1857 */
096102bd 1858static int init_kernel_tracer(void)
b73401da
DG
1859{
1860 int ret;
b73401da 1861
096102bd
DG
1862 /* Modprobe lttng kernel modules */
1863 ret = modprobe_lttng_control();
b73401da 1864 if (ret < 0) {
b73401da
DG
1865 goto error;
1866 }
1867
096102bd
DG
1868 /* Open debugfs lttng */
1869 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1870 if (kernel_tracer_fd < 0) {
1871 DBG("Failed to open %s", module_proc_lttng);
1872 ret = -1;
1873 goto error_open;
b73401da
DG
1874 }
1875
096102bd
DG
1876 /* Validate kernel version */
1877 ret = validate_lttng_modules_version();
b73401da 1878 if (ret < 0) {
096102bd 1879 goto error_version;
b73401da
DG
1880 }
1881
096102bd 1882 ret = modprobe_lttng_data();
b73401da 1883 if (ret < 0) {
096102bd 1884 goto error_modules;
8c0faa1d
DG
1885 }
1886
f3ed775e 1887 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG
1888 return 0;
1889
1890error_version:
1891 modprobe_remove_lttng_control();
76d7553f
MD
1892 ret = close(kernel_tracer_fd);
1893 if (ret) {
1894 PERROR("close");
1895 }
1896 kernel_tracer_fd = -1;
096102bd
DG
1897 return LTTCOMM_KERN_VERSION;
1898
1899error_modules:
76d7553f
MD
1900 ret = close(kernel_tracer_fd);
1901 if (ret) {
1902 PERROR("close");
1903 }
096102bd
DG
1904
1905error_open:
1906 modprobe_remove_lttng_control();
b73401da
DG
1907
1908error:
b73401da 1909 WARN("No kernel tracer available");
a4b35e07 1910 kernel_tracer_fd = -1;
531d29f9
MD
1911 if (!is_root) {
1912 return LTTCOMM_NEED_ROOT_SESSIOND;
1913 } else {
1914 return LTTCOMM_KERN_NA;
1915 }
f3ed775e 1916}
33a2b854 1917
f3ed775e 1918/*
54d01ffb 1919 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1920 */
54d01ffb 1921static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1922{
f40799e8 1923 int ret = 0;
8c0faa1d 1924
3bd1e081 1925 if (session->consumer_fds_sent == 0) {
d9800920 1926 /*
54d01ffb 1927 * Assign default kernel consumer socket if no consumer assigned to the
03550b58 1928 * kernel session. At this point, it's NOT supposed to be -1 but this is
54d01ffb 1929 * an extra security check.
d9800920 1930 */
03550b58 1931 if (session->consumer_fd < 0) {
3bd1e081 1932 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
1933 }
1934
2bdd86d4 1935 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1936 if (ret < 0) {
f3ed775e
DG
1937 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1938 goto error;
1939 }
1d4b027a 1940
3bd1e081 1941 session->consumer_fds_sent = 1;
f3ed775e 1942 }
1d4b027a
DG
1943
1944error:
1945 return ret;
8c0faa1d
DG
1946}
1947
0177d773
DG
1948/*
1949 * Create an UST session and add it to the session ust list.
1950 */
44d3bd01 1951static int create_ust_session(struct ltt_session *session,
6df2e2c9 1952 struct lttng_domain *domain)
0177d773 1953{
13384287 1954 struct ltt_ust_session *lus = NULL;
6df2e2c9 1955 int ret;
44d3bd01
DG
1956
1957 switch (domain->type) {
48842b30 1958 case LTTNG_DOMAIN_UST:
44d3bd01
DG
1959 break;
1960 default:
13384287 1961 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG
1962 goto error;
1963 }
0177d773
DG
1964
1965 DBG("Creating UST session");
1966
a991f516 1967 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1968 if (lus == NULL) {
44d3bd01 1969 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1970 goto error;
1971 }
1972
e11d277b 1973 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1974 session->uid, session->gid);
0177d773
DG
1975 if (ret < 0) {
1976 if (ret != -EEXIST) {
1977 ERR("Trace directory creation error");
44d3bd01 1978 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG
1979 goto error;
1980 }
1981 }
1982
f6a9efaa
DG
1983 /* The domain type dictate different actions on session creation */
1984 switch (domain->type) {
48842b30
DG
1985 case LTTNG_DOMAIN_UST:
1986 /* No ustctl for the global UST domain */
1987 break;
1988 default:
36dc12cc 1989 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1990 goto error;
0177d773 1991 }
6df2e2c9
MD
1992 lus->uid = session->uid;
1993 lus->gid = session->gid;
f6a9efaa 1994 session->ust_session = lus;
44d3bd01
DG
1995
1996 return LTTCOMM_OK;
0177d773
DG
1997
1998error:
1999 free(lus);
2000 return ret;
2001}
2002
333f285e 2003/*
d063d709 2004 * Create a kernel tracer session then create the default channel.
333f285e 2005 */
6df2e2c9 2006static int create_kernel_session(struct ltt_session *session)
333f285e 2007{
f3ed775e 2008 int ret;
f3ed775e
DG
2009
2010 DBG("Creating kernel session");
2011
2012 ret = kernel_create_session(session, kernel_tracer_fd);
2013 if (ret < 0) {
2014 ret = LTTCOMM_KERN_SESS_FAIL;
2015 goto error;
333f285e
DG
2016 }
2017
d9800920 2018 /* Set kernel consumer socket fd */
03550b58 2019 if (kconsumer_data.cmd_sock >= 0) {
3bd1e081 2020 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG
2021 }
2022
e11d277b 2023 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 2024 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 2025 if (ret < 0) {
996b65c8 2026 if (ret != -EEXIST) {
7a485870
DG
2027 ERR("Trace directory creation error");
2028 goto error;
2029 }
2030 }
6df2e2c9
MD
2031 session->kernel_session->uid = session->uid;
2032 session->kernel_session->gid = session->gid;
7a485870 2033
f3ed775e
DG
2034error:
2035 return ret;
333f285e
DG
2036}
2037
8e0af1b4 2038/*
c7704d57
DG
2039 * Check if the UID or GID match the session. Root user has access to all
2040 * sessions.
8e0af1b4 2041 */
c7704d57 2042static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 2043{
c7704d57 2044 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD
2045 return 0;
2046 } else {
2047 return 1;
2048 }
2049}
2050
2051static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2052{
2053 unsigned int i = 0;
2054 struct ltt_session *session;
2055
2056 DBG("Counting number of available session for UID %d GID %d",
2057 uid, gid);
2058 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2059 /*
2060 * Only list the sessions the user can control.
2061 */
2062 if (!session_access_ok(session, uid, gid)) {
2063 continue;
2064 }
2065 i++;
2066 }
2067 return i;
2068}
2069
6c9cc2ab
DG
2070/*
2071 * Using the session list, filled a lttng_session array to send back to the
2072 * client for session listing.
2073 *
2074 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 2075 * session_lock_list() and session_unlock_list().
6c9cc2ab 2076 */
c7704d57
DG
2077static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2078 gid_t gid)
6c9cc2ab 2079{
8e0af1b4 2080 unsigned int i = 0;
6c9cc2ab
DG
2081 struct ltt_session *session;
2082
8e0af1b4
MD
2083 DBG("Getting all available session for UID %d GID %d",
2084 uid, gid);
6c9cc2ab
DG
2085 /*
2086 * Iterate over session list and append data after the control struct in
2087 * the buffer.
2088 */
2089 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD
2090 /*
2091 * Only list the sessions the user can control.
2092 */
2093 if (!session_access_ok(session, uid, gid)) {
2094 continue;
2095 }
6c9cc2ab 2096 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 2097 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 2098 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 2099 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 2100 sessions[i].enabled = session->enabled;
6c9cc2ab
DG
2101 i++;
2102 }
2103}
2104
9f19cc17
DG
2105/*
2106 * Fill lttng_channel array of all channels.
2107 */
b551a063 2108static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG
2109 struct lttng_channel *channels)
2110{
2111 int i = 0;
2112 struct ltt_kernel_channel *kchan;
2113
2114 DBG("Listing channels for session %s", session->name);
2115
b551a063
DG
2116 switch (domain) {
2117 case LTTNG_DOMAIN_KERNEL:
2118 /* Kernel channels */
2119 if (session->kernel_session != NULL) {
2120 cds_list_for_each_entry(kchan,
2121 &session->kernel_session->channel_list.head, list) {
2122 /* Copy lttng_channel struct to array */
2123 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2124 channels[i].enabled = kchan->enabled;
2125 i++;
2126 }
2127 }
2128 break;
2129 case LTTNG_DOMAIN_UST:
2130 {
bec39940 2131 struct lttng_ht_iter iter;
b551a063
DG
2132 struct ltt_ust_channel *uchan;
2133
bec39940
DG
2134 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2135 &iter.iter, uchan, node.node) {
b551a063
DG
2136 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2137 channels[i].attr.overwrite = uchan->attr.overwrite;
2138 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2139 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2140 channels[i].attr.switch_timer_interval =
2141 uchan->attr.switch_timer_interval;
2142 channels[i].attr.read_timer_interval =
2143 uchan->attr.read_timer_interval;
aea829b3 2144 channels[i].enabled = uchan->enabled;
5edd7e09
DG
2145 switch (uchan->attr.output) {
2146 case LTTNG_UST_MMAP:
2147 default:
2148 channels[i].attr.output = LTTNG_EVENT_MMAP;
2149 break;
2150 }
befe0905 2151 i++;
b551a063
DG
2152 }
2153 break;
2154 }
2155 default:
2156 break;
2157 }
2158}
2159
2160/*
2161 * Create a list of ust global domain events.
2162 */
2163static int list_lttng_ust_global_events(char *channel_name,
2164 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2165{
2166 int i = 0, ret = 0;
2167 unsigned int nb_event = 0;
bec39940
DG
2168 struct lttng_ht_iter iter;
2169 struct lttng_ht_node_str *node;
b551a063
DG
2170 struct ltt_ust_channel *uchan;
2171 struct ltt_ust_event *uevent;
2172 struct lttng_event *tmp;
2173
2174 DBG("Listing UST global events for channel %s", channel_name);
2175
2176 rcu_read_lock();
2177
bec39940
DG
2178 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2179 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG
2180 if (node == NULL) {
2181 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2182 goto error;
b551a063
DG
2183 }
2184
bec39940 2185 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2186
bec39940 2187 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2188
b551a063
DG
2189 if (nb_event == 0) {
2190 ret = nb_event;
2191 goto error;
2192 }
2193
2194 DBG3("Listing UST global %d events", nb_event);
2195
2196 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2197 if (tmp == NULL) {
2198 ret = -LTTCOMM_FATAL;
2199 goto error;
2200 }
2201
bec39940 2202 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG
2203 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2204 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2205 tmp[i].enabled = uevent->enabled;
2206 switch (uevent->attr.instrumentation) {
2207 case LTTNG_UST_TRACEPOINT:
2208 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2209 break;
2210 case LTTNG_UST_PROBE:
2211 tmp[i].type = LTTNG_EVENT_PROBE;
2212 break;
2213 case LTTNG_UST_FUNCTION:
2214 tmp[i].type = LTTNG_EVENT_FUNCTION;
2215 break;
0cda4f28 2216 }
8005f29a 2217 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2218 switch (uevent->attr.loglevel_type) {
8005f29a 2219 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2220 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2221 break;
8005f29a 2222 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2223 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD
2224 break;
2225 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2226 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2227 break;
9f19cc17 2228 }
d7b75b30 2229 i++;
9f19cc17
DG
2230 }
2231
b551a063
DG
2232 ret = nb_event;
2233 *events = tmp;
2234
2235error:
2236 rcu_read_unlock();
2237 return ret;
9f19cc17
DG
2238}
2239
2240/*
b551a063 2241 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2242 */
b551a063
DG
2243static int list_lttng_kernel_events(char *channel_name,
2244 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2245{
b551a063
DG
2246 int i = 0, ret;
2247 unsigned int nb_event;
9f19cc17 2248 struct ltt_kernel_event *event;
b551a063
DG
2249 struct ltt_kernel_channel *kchan;
2250
2251 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2252 if (kchan == NULL) {
2253 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2254 goto error;
2255 }
2256
2257 nb_event = kchan->event_count;
9f19cc17
DG
2258
2259 DBG("Listing events for channel %s", kchan->channel->name);
2260
b551a063
DG
2261 if (nb_event == 0) {
2262 ret = nb_event;
2263 goto error;
2264 }
2265
2266 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2267 if (*events == NULL) {
2268 ret = LTTCOMM_FATAL;
2269 goto error;
2270 }
2271
9f19cc17
DG
2272 /* Kernel channels */
2273 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG
2274 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2275 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2276 (*events)[i].enabled = event->enabled;
9f19cc17
DG
2277 switch (event->event->instrumentation) {
2278 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2279 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG
2280 break;
2281 case LTTNG_KERNEL_KPROBE:
2282 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG
2283 (*events)[i].type = LTTNG_EVENT_PROBE;
2284 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG
2285 sizeof(struct lttng_kernel_kprobe));
2286 break;
2287 case LTTNG_KERNEL_FUNCTION:
b551a063
DG
2288 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2289 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG
2290 sizeof(struct lttng_kernel_function));
2291 break;
0133c199 2292 case LTTNG_KERNEL_NOOP:
b551a063 2293 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2294 break;
a54bd42d 2295 case LTTNG_KERNEL_SYSCALL:
b551a063 2296 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2297 break;
7a3d1328
MD
2298 case LTTNG_KERNEL_ALL:
2299 assert(0);
2300 break;
9f19cc17
DG
2301 }
2302 i++;
2303 }
b551a063
DG
2304
2305 return nb_event;
2306
2307error:
2308 return ret;
9f19cc17
DG
2309}
2310
fac6795d 2311/*
54d01ffb 2312 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2313 */
54d01ffb
DG
2314static int cmd_disable_channel(struct ltt_session *session,
2315 int domain, char *channel_name)
fac6795d 2316{
54d01ffb 2317 int ret;
78f0bacd
DG
2318 struct ltt_ust_session *usess;
2319
2320 usess = session->ust_session;
379473d2 2321
54d01ffb 2322 switch (domain) {
78f0bacd
DG
2323 case LTTNG_DOMAIN_KERNEL:
2324 {
2325 ret = channel_kernel_disable(session->kernel_session,
2326 channel_name);
2327 if (ret != LTTCOMM_OK) {
2328 goto error;
2329 }
54d01ffb 2330
78f0bacd
DG
2331 kernel_wait_quiescent(kernel_tracer_fd);
2332 break;
2333 }
2334 case LTTNG_DOMAIN_UST:
2335 {
2336 struct ltt_ust_channel *uchan;
bec39940 2337 struct lttng_ht *chan_ht;
78f0bacd 2338
7885e399
DG
2339 chan_ht = usess->domain_global.channels;
2340
2341 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG
2342 if (uchan == NULL) {
2343 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2344 goto error;
78f0bacd
DG
2345 }
2346
7885e399
DG
2347 ret = channel_ust_disable(usess, domain, uchan);
2348 if (ret != LTTCOMM_OK) {
78f0bacd
DG
2349 goto error;
2350 }
78f0bacd
DG
2351 break;
2352 }
d78d6610 2353#if 0
78f0bacd
DG
2354 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2355 case LTTNG_DOMAIN_UST_EXEC_NAME:
2356 case LTTNG_DOMAIN_UST_PID:
d78d6610 2357#endif
78f0bacd
DG
2358 default:
2359 ret = LTTCOMM_UNKNOWN_DOMAIN;
2360 goto error;
20fe2104
DG
2361 }
2362
54d01ffb 2363 ret = LTTCOMM_OK;
d65106b1 2364
54d01ffb
DG
2365error:
2366 return ret;
2367}
2368
2369/*
2370 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2371 */
44d3bd01 2372static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2373 int domain, struct lttng_channel *attr)
54d01ffb
DG
2374{
2375 int ret;
f6a9efaa 2376 struct ltt_ust_session *usess = session->ust_session;
bec39940 2377 struct lttng_ht *chan_ht;
f6a9efaa 2378
5d56b5aa 2379 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2380
aea829b3 2381 switch (domain) {
44d3bd01
DG
2382 case LTTNG_DOMAIN_KERNEL:
2383 {
2384 struct ltt_kernel_channel *kchan;
54d01ffb 2385
44d3bd01
DG
2386 kchan = trace_kernel_get_channel_by_name(attr->name,
2387 session->kernel_session);
2388 if (kchan == NULL) {
2389 ret = channel_kernel_create(session->kernel_session,
2390 attr, kernel_poll_pipe[1]);
2391 } else {
2392 ret = channel_kernel_enable(session->kernel_session, kchan);
2393 }
2394
2395 if (ret != LTTCOMM_OK) {
2396 goto error;
2397 }
2398
2399 kernel_wait_quiescent(kernel_tracer_fd);
2400 break;
2401 }
f6a9efaa
DG
2402 case LTTNG_DOMAIN_UST:
2403 {
2404 struct ltt_ust_channel *uchan;
2405
7885e399 2406 chan_ht = usess->domain_global.channels;
f6a9efaa 2407
7885e399 2408 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2409 if (uchan == NULL) {
7885e399 2410 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2411 } else {
7885e399 2412 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2413 }
f6a9efaa
DG
2414 break;
2415 }
d78d6610 2416#if 0
78f0bacd
DG
2417 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2418 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2419 case LTTNG_DOMAIN_UST_PID:
d78d6610 2420#endif
44d3bd01
DG
2421 default:
2422 ret = LTTCOMM_UNKNOWN_DOMAIN;
2423 goto error;
54d01ffb
DG
2424 }
2425
54d01ffb
DG
2426error:
2427 return ret;
2428}
2429
2430/*
2431 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2432 */
2433static int cmd_disable_event(struct ltt_session *session, int domain,
2434 char *channel_name, char *event_name)
2435{
2436 int ret;
54d01ffb
DG
2437
2438 switch (domain) {
2439 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2440 {
2441 struct ltt_kernel_channel *kchan;
b0a40d28 2442 struct ltt_kernel_session *ksess;
2bdd86d4 2443
b0a40d28
DG
2444 ksess = session->kernel_session;
2445
2446 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2447 if (kchan == NULL) {
2448 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2449 goto error;
d65106b1
DG
2450 }
2451
b0a40d28 2452 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG
2453 if (ret != LTTCOMM_OK) {
2454 goto error;
2455 }
2456
2457 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2458 break;
2bdd86d4
MD
2459 }
2460 case LTTNG_DOMAIN_UST:
b0a40d28 2461 {
b0a40d28 2462 struct ltt_ust_channel *uchan;
7f79d3a1 2463 struct ltt_ust_session *usess;
b0a40d28
DG
2464
2465 usess = session->ust_session;
2466
2467 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2468 channel_name);
2469 if (uchan == NULL) {
2470 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2471 goto error;
2472 }
2473
7f79d3a1
DG
2474 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2475 if (ret != LTTCOMM_OK) {
b0a40d28
DG
2476 goto error;
2477 }
2478
7f79d3a1 2479 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2480 channel_name);
b0a40d28
DG
2481 break;
2482 }
d78d6610 2483#if 0
2bdd86d4
MD
2484 case LTTNG_DOMAIN_UST_EXEC_NAME:
2485 case LTTNG_DOMAIN_UST_PID:
2486 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2487#endif
54d01ffb 2488 default:
1ab1ea0b 2489 ret = LTTCOMM_UND;
54d01ffb 2490 goto error;
d65106b1 2491 }
26cc6b4e 2492
54d01ffb
DG
2493 ret = LTTCOMM_OK;
2494
2495error:
2496 return ret;
2497}
2498
2499/*
2500 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2501 */
2502static int cmd_disable_event_all(struct ltt_session *session, int domain,
2503 char *channel_name)
2504{
2505 int ret;
54d01ffb
DG
2506
2507 switch (domain) {
2508 case LTTNG_DOMAIN_KERNEL:
9730260e
DG
2509 {
2510 struct ltt_kernel_session *ksess;
2511 struct ltt_kernel_channel *kchan;
2512
2513 ksess = session->kernel_session;
2514
2515 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG
2516 if (kchan == NULL) {
2517 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2518 goto error;
26cc6b4e
DG
2519 }
2520
9730260e 2521 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2522 if (ret != LTTCOMM_OK) {
0b97ec54 2523 goto error;
26cc6b4e
DG
2524 }
2525
54d01ffb 2526 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2527 break;
9730260e
DG
2528 }
2529 case LTTNG_DOMAIN_UST:
2530 {
2531 struct ltt_ust_session *usess;
2532 struct ltt_ust_channel *uchan;
2533
2534 usess = session->ust_session;
2535
2536 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2537 channel_name);
2538 if (uchan == NULL) {
2539 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2540 goto error;
2541 }
2542
7f79d3a1
DG
2543 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2544 if (ret != 0) {
9730260e
DG
2545 goto error;
2546 }
2547
7f79d3a1 2548 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG
2549
2550 break;
2551 }
d78d6610 2552#if 0
9730260e
DG
2553 case LTTNG_DOMAIN_UST_EXEC_NAME:
2554 case LTTNG_DOMAIN_UST_PID:
2555 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2556#endif
54d01ffb 2557 default:
1ab1ea0b 2558 ret = LTTCOMM_UND;
54d01ffb 2559 goto error;
26cc6b4e 2560 }
e953ef25 2561
54d01ffb 2562 ret = LTTCOMM_OK;
e953ef25 2563
54d01ffb
DG
2564error:
2565 return ret;
2566}
f5177a38 2567
54d01ffb
DG
2568/*
2569 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2570 */
2571static int cmd_add_context(struct ltt_session *session, int domain,
2572 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2573{
2574 int ret;
f5177a38 2575
54d01ffb
DG
2576 switch (domain) {
2577 case LTTNG_DOMAIN_KERNEL:
2578 /* Add kernel context to kernel tracer */
2579 ret = context_kernel_add(session->kernel_session, ctx,
2580 event_name, channel_name);
2581 if (ret != LTTCOMM_OK) {
f5177a38 2582 goto error;
e953ef25 2583 }
2bdd86d4
MD
2584 break;
2585 case LTTNG_DOMAIN_UST:
2586 {
55cc08a6 2587 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2588
55cc08a6
DG
2589 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2590 if (ret != LTTCOMM_OK) {
2591 goto error;
2bdd86d4 2592 }
e953ef25 2593 break;
2bdd86d4 2594 }
d78d6610 2595#if 0
55cc08a6
DG
2596 case LTTNG_DOMAIN_UST_EXEC_NAME:
2597 case LTTNG_DOMAIN_UST_PID:
2598 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2599#endif
54d01ffb 2600 default:
1ab1ea0b 2601 ret = LTTCOMM_UND;
54d01ffb 2602 goto error;
e953ef25 2603 }
950131af 2604
54d01ffb 2605 ret = LTTCOMM_OK;
950131af 2606
54d01ffb
DG
2607error:
2608 return ret;
2609}
2610
2611/*
2612 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2613 */
2614static int cmd_enable_event(struct ltt_session *session, int domain,
2615 char *channel_name, struct lttng_event *event)
2616{
2617 int ret;
f6cd6b0f 2618 struct lttng_channel *attr;
48842b30 2619 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG
2620
2621 switch (domain) {
2622 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD
2623 {
2624 struct ltt_kernel_channel *kchan;
2625
54d01ffb
DG
2626 kchan = trace_kernel_get_channel_by_name(channel_name,
2627 session->kernel_session);
2628 if (kchan == NULL) {
f6cd6b0f
DG
2629 attr = channel_new_default_attr(domain);
2630 if (attr == NULL) {
2631 ret = LTTCOMM_FATAL;
2632 goto error;
2633 }
2634 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2635
54d01ffb 2636 /* This call will notify the kernel thread */
44d3bd01 2637 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2638 attr, kernel_poll_pipe[1]);
54d01ffb 2639 if (ret != LTTCOMM_OK) {
ff4d74e6 2640 free(attr);
f5177a38
DG
2641 goto error;
2642 }
ff4d74e6 2643 free(attr);
54d01ffb 2644 }
950131af 2645
54d01ffb
DG
2646 /* Get the newly created kernel channel pointer */
2647 kchan = trace_kernel_get_channel_by_name(channel_name,
2648 session->kernel_session);
2649 if (kchan == NULL) {
2650 /* This sould not happen... */
2651 ret = LTTCOMM_FATAL;
2652 goto error;
2653 }
f5177a38 2654
48842b30
DG
2655 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2656 event);
54d01ffb 2657 if (ret != LTTCOMM_OK) {
f5177a38 2658 goto error;
950131af
DG
2659 }
2660
54d01ffb 2661 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2662 break;
2bdd86d4
MD
2663 }
2664 case LTTNG_DOMAIN_UST:
2665 {
aea829b3 2666 struct lttng_channel *attr;
edb67388 2667 struct ltt_ust_channel *uchan;
2bdd86d4 2668
edb67388 2669 /* Get channel from global UST domain */
48842b30
DG
2670 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2671 channel_name);
2672 if (uchan == NULL) {
aea829b3
DG
2673 /* Create default channel */
2674 attr = channel_new_default_attr(domain);
2675 if (attr == NULL) {
2676 ret = LTTCOMM_FATAL;
2677 goto error;
2678 }
596219f7 2679 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2680 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2681
7885e399 2682 ret = channel_ust_create(usess, domain, attr);
edb67388 2683 if (ret != LTTCOMM_OK) {
ff4d74e6 2684 free(attr);
aea829b3
DG
2685 goto error;
2686 }
aea829b3
DG
2687 free(attr);
2688
2689 /* Get the newly created channel reference back */
2690 uchan = trace_ust_find_channel_by_name(
2691 usess->domain_global.channels, channel_name);
2692 if (uchan == NULL) {
2693 /* Something is really wrong */
2694 ret = LTTCOMM_FATAL;
2695 goto error;
2696 }
48842b30 2697 }
2bdd86d4 2698
edb67388 2699 /* At this point, the session and channel exist on the tracer */
edb67388
DG
2700 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2701 if (ret != LTTCOMM_OK) {
48842b30 2702 goto error;
2bdd86d4
MD
2703 }
2704 break;
2705 }
d78d6610 2706#if 0
2bdd86d4
MD
2707 case LTTNG_DOMAIN_UST_EXEC_NAME:
2708 case LTTNG_DOMAIN_UST_PID:
2709 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2710#endif
54d01ffb 2711 default:
1ab1ea0b 2712 ret = LTTCOMM_UND;
54d01ffb 2713 goto error;
950131af 2714 }
d36b8583 2715
54d01ffb 2716 ret = LTTCOMM_OK;
d36b8583 2717
54d01ffb
DG
2718error:
2719 return ret;
2720}
7d29a247 2721
54d01ffb
DG
2722/*
2723 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2724 */
2725static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2726 char *channel_name, int event_type)
54d01ffb
DG
2727{
2728 int ret;
2729 struct ltt_kernel_channel *kchan;
7d29a247 2730
54d01ffb
DG
2731 switch (domain) {
2732 case LTTNG_DOMAIN_KERNEL:
2733 kchan = trace_kernel_get_channel_by_name(channel_name,
2734 session->kernel_session);
2735 if (kchan == NULL) {
2736 /* This call will notify the kernel thread */
44d3bd01
DG
2737 ret = channel_kernel_create(session->kernel_session, NULL,
2738 kernel_poll_pipe[1]);
54d01ffb
DG
2739 if (ret != LTTCOMM_OK) {
2740 goto error;
d36b8583 2741 }
0d0c377a 2742
8f69e5eb
DG
2743 /* Get the newly created kernel channel pointer */
2744 kchan = trace_kernel_get_channel_by_name(channel_name,
2745 session->kernel_session);
2746 if (kchan == NULL) {
2747 /* This sould not happen... */
2748 ret = LTTCOMM_FATAL;
2749 goto error;
2750 }
2751
54d01ffb 2752 }
0fdd1e2c 2753
7a3d1328 2754 switch (event_type) {
76d45b40 2755 case LTTNG_EVENT_SYSCALL:
7a3d1328 2756 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2757 kchan, kernel_tracer_fd);
7a3d1328 2758 break;
76d45b40 2759 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2760 /*
7a3d1328
MD
2761 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2762 * events already registered to the channel.
8c9ae521 2763 */
7a3d1328
MD
2764 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2765 kchan, kernel_tracer_fd);
2766 break;
76d45b40 2767 case LTTNG_EVENT_ALL:
7a3d1328 2768 /* Enable syscalls and tracepoints */
8c9ae521
DG
2769 ret = event_kernel_enable_all(session->kernel_session,
2770 kchan, kernel_tracer_fd);
7a3d1328
MD
2771 break;
2772 default:
2773 ret = LTTCOMM_KERN_ENABLE_FAIL;
2774 goto error;
8c9ae521 2775 }
8f69e5eb
DG
2776
2777 /* Manage return value */
54d01ffb 2778 if (ret != LTTCOMM_OK) {
0d0c377a 2779 goto error;
d36b8583
DG
2780 }
2781
54d01ffb 2782 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2783 break;
76d45b40
DG
2784 case LTTNG_DOMAIN_UST:
2785 {
2786 struct lttng_channel *attr;
2787 struct ltt_ust_channel *uchan;
2788 struct ltt_ust_session *usess = session->ust_session;
2789
2790 /* Get channel from global UST domain */
2791 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2792 channel_name);
2793 if (uchan == NULL) {
2794 /* Create default channel */
2795 attr = channel_new_default_attr(domain);
2796 if (attr == NULL) {
2797 ret = LTTCOMM_FATAL;
2798 goto error;
2799 }
2800 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2801 attr->name[NAME_MAX - 1] = '\0';
2802
2803 /* Use the internal command enable channel */
7885e399 2804 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG
2805 if (ret != LTTCOMM_OK) {
2806 free(attr);
2807 goto error;
2808 }
2809 free(attr);
2810
2811 /* Get the newly created channel reference back */
2812 uchan = trace_ust_find_channel_by_name(
2813 usess->domain_global.channels, channel_name);
2814 if (uchan == NULL) {
2815 /* Something is really wrong */
2816 ret = LTTCOMM_FATAL;
2817 goto error;
2818 }
2819 }
2820
2821 /* At this point, the session and channel exist on the tracer */
2822
2823 switch (event_type) {
2824 case LTTNG_EVENT_ALL:
2825 case LTTNG_EVENT_TRACEPOINT:
2826 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2827 if (ret != LTTCOMM_OK) {
2828 goto error;
2829 }
2830 break;
2831 default:
2832 ret = LTTCOMM_UST_ENABLE_FAIL;
2833 goto error;
2834 }
2835
2836 /* Manage return value */
2837 if (ret != LTTCOMM_OK) {
2838 goto error;
2839 }
2840
2841 break;
2842 }
d78d6610 2843#if 0
76d45b40
DG
2844 case LTTNG_DOMAIN_UST_EXEC_NAME:
2845 case LTTNG_DOMAIN_UST_PID:
2846 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2847#endif
54d01ffb 2848 default:
1ab1ea0b 2849 ret = LTTCOMM_UND;
54d01ffb 2850 goto error;
d36b8583 2851 }
f3ed775e 2852
54d01ffb
DG
2853 ret = LTTCOMM_OK;
2854
2855error:
2856 return ret;
2857}
2858
2859/*
2860 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2861 */
2862static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2863{
2864 int ret;
2865 ssize_t nb_events = 0;
2866
2867 switch (domain) {
2868 case LTTNG_DOMAIN_KERNEL:
2869 nb_events = kernel_list_events(kernel_tracer_fd, events);
2870 if (nb_events < 0) {
2871 ret = LTTCOMM_KERN_LIST_FAIL;
2872 goto error;
894be886 2873 }
54d01ffb 2874 break;
b551a063
DG
2875 case LTTNG_DOMAIN_UST:
2876 nb_events = ust_app_list_events(events);
2877 if (nb_events < 0) {
2878 ret = LTTCOMM_UST_LIST_FAIL;
2879 goto error;
2880 }
2881 break;
54d01ffb 2882 default:
1ab1ea0b 2883 ret = LTTCOMM_UND;
54d01ffb
DG
2884 goto error;
2885 }
894be886 2886
54d01ffb 2887 return nb_events;
7d29a247 2888
54d01ffb
DG
2889error:
2890 /* Return negative value to differentiate return code */
2891 return -ret;
2892}
b389abbe 2893
54d01ffb
DG
2894/*
2895 * Command LTTNG_START_TRACE processed by the client thread.
2896 */
2897static int cmd_start_trace(struct ltt_session *session)
2898{
2899 int ret;
54d01ffb 2900 struct ltt_kernel_session *ksession;
b9d9b220 2901 struct ltt_ust_session *usess;
b389abbe 2902
54d01ffb
DG
2903 /* Short cut */
2904 ksession = session->kernel_session;
b9d9b220 2905 usess = session->ust_session;
5eb91c98 2906
b9ef1c83 2907 if (session->enabled) {
80e327fa
DG
2908 /* Already started. */
2909 ret = LTTCOMM_TRACE_ALREADY_STARTED;
b9ef1c83
DG
2910 goto error;
2911 }
2912
464dd62d
MD
2913 session->enabled = 1;
2914
54d01ffb
DG
2915 /* Kernel tracing */
2916 if (ksession != NULL) {
2bdd86d4
MD
2917 struct ltt_kernel_channel *kchan;
2918
54d01ffb
DG
2919 /* Open kernel metadata */
2920 if (ksession->metadata == NULL) {
2921 ret = kernel_open_metadata(ksession, ksession->trace_path);
2922 if (ret < 0) {
2923 ret = LTTCOMM_KERN_META_FAIL;
2924 goto error;
b389abbe 2925 }
54d01ffb 2926 }
7d29a247 2927
54d01ffb 2928 /* Open kernel metadata stream */
03550b58 2929 if (ksession->metadata_stream_fd < 0) {
54d01ffb
DG
2930 ret = kernel_open_metadata_stream(ksession);
2931 if (ret < 0) {
2932 ERR("Kernel create metadata stream failed");
2933 ret = LTTCOMM_KERN_STREAM_FAIL;
2934 goto error;
2935 }
2936 }
2937
2938 /* For each channel */
2939 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2940 if (kchan->stream_count == 0) {
2941 ret = kernel_open_channel_stream(kchan);
2942 if (ret < 0) {
2943 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG
2944 goto error;
2945 }
54d01ffb
DG
2946 /* Update the stream global counter */
2947 ksession->stream_count_global += ret;
7d29a247 2948 }
54d01ffb
DG
2949 }
2950
2951 /* Setup kernel consumer socket and send fds to it */
2952 ret = init_kernel_tracing(ksession);
2953 if (ret < 0) {
2954 ret = LTTCOMM_KERN_START_FAIL;
2955 goto error;
2956 }
2957
2958 /* This start the kernel tracing */
2959 ret = kernel_start_session(ksession);
2960 if (ret < 0) {
2961 ret = LTTCOMM_KERN_START_FAIL;
2962 goto error;
2963 }
2964
2965 /* Quiescent wait after starting trace */
2966 kernel_wait_quiescent(kernel_tracer_fd);
2967 }
2968
36dc12cc 2969 /* Flag session that trace should start automatically */
b9d9b220
DG
2970 if (usess) {
2971 usess->start_trace = 1;
36dc12cc 2972
b9d9b220
DG
2973 ret = ust_app_start_trace_all(usess);
2974 if (ret < 0) {
2975 ret = LTTCOMM_UST_START_FAIL;
2976 goto error;
2977 }
2bdd86d4 2978 }
54d01ffb
DG
2979
2980 ret = LTTCOMM_OK;
2981
2982error:
2983 return ret;
2984}
2985
2986/*
2987 * Command LTTNG_STOP_TRACE processed by the client thread.
2988 */
2989static int cmd_stop_trace(struct ltt_session *session)
2990{
2991 int ret;
2992 struct ltt_kernel_channel *kchan;
2993 struct ltt_kernel_session *ksession;
8be98f9a 2994 struct ltt_ust_session *usess;
54d01ffb
DG
2995
2996 /* Short cut */
2997 ksession = session->kernel_session;
8be98f9a 2998 usess = session->ust_session;
54d01ffb 2999
b9ef1c83 3000 if (!session->enabled) {
80e327fa 3001 ret = LTTCOMM_TRACE_ALREADY_STOPPED;
b9ef1c83
DG
3002 goto error;
3003 }
3004
464dd62d
MD
3005 session->enabled = 0;
3006
54d01ffb
DG
3007 /* Kernel tracer */
3008 if (ksession != NULL) {
3009 DBG("Stop kernel tracing");
3010
3011 /* Flush all buffers before stopping */
3012 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
3013 if (ret < 0) {
3014 ERR("Kernel metadata flush failed");
3015 }
f34daff7 3016
54d01ffb
DG
3017 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
3018 ret = kernel_flush_buffer(kchan);
0d0c377a 3019 if (ret < 0) {
54d01ffb 3020 ERR("Kernel flush buffer error");
7d29a247 3021 }
54d01ffb 3022 }
19e70852 3023
54d01ffb
DG
3024 ret = kernel_stop_session(ksession);
3025 if (ret < 0) {
3026 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 3027 goto error;
f3ed775e 3028 }
54d01ffb
DG
3029
3030 kernel_wait_quiescent(kernel_tracer_fd);
894be886 3031 }
54d01ffb 3032
8be98f9a
MD
3033 if (usess) {
3034 usess->start_trace = 0;
2bdd86d4 3035
8be98f9a 3036 ret = ust_app_stop_trace_all(usess);
2bdd86d4 3037 if (ret < 0) {
190df5ac 3038 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD
3039 goto error;
3040 }
2bdd86d4 3041 }
54d01ffb
DG
3042
3043 ret = LTTCOMM_OK;
3044
3045error:
3046 return ret;
3047}
3048
3049/*
3050 * Command LTTNG_CREATE_SESSION processed by the client thread.
3051 */
730389d9 3052static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds)
54d01ffb
DG
3053{
3054 int ret;
3055
730389d9
DG
3056 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
3057 LTTNG_SOCK_GET_GID_CRED(creds));
54d01ffb
DG
3058 if (ret != LTTCOMM_OK) {
3059 goto error;
3060 }
3061
3062 ret = LTTCOMM_OK;
3063
3064error:
3065 return ret;
3066}
3067
3068/*
3069 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3070 */
3071static int cmd_destroy_session(struct ltt_session *session, char *name)
3072{
3073 int ret;
3074
3075 /* Clean kernel session teardown */
3076 teardown_kernel_session(session);
84cd17c6
MD
3077 /* UST session teardown */
3078 teardown_ust_session(session);
54d01ffb
DG
3079
3080 /*
3081 * Must notify the kernel thread here to update it's poll setin order
3082 * to remove the channel(s)' fd just destroyed.
3083 */
3084 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3085 if (ret < 0) {
76d7553f 3086 PERROR("write kernel poll pipe");
54d01ffb
DG
3087 }
3088
271933a4 3089 ret = session_destroy(session);
54d01ffb
DG
3090
3091 return ret;
3092}
3093
3094/*
3095 * Command LTTNG_CALIBRATE processed by the client thread.
3096 */
3097static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3098{
3099 int ret;
3100
3101 switch (domain) {
3102 case LTTNG_DOMAIN_KERNEL:
33a2b854 3103 {
54d01ffb 3104 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3105
54d01ffb
DG
3106 kcalibrate.type = calibrate->type;
3107 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3108 if (ret < 0) {
54d01ffb
DG
3109 ret = LTTCOMM_KERN_ENABLE_FAIL;
3110 goto error;
33a2b854 3111 }
54d01ffb
DG
3112 break;
3113 }
4466912f
DG
3114 case LTTNG_DOMAIN_UST:
3115 {
3116 struct lttng_ust_calibrate ucalibrate;
3117
3118 ucalibrate.type = calibrate->type;
3119 ret = ust_app_calibrate_glb(&ucalibrate);
3120 if (ret < 0) {
3121 ret = LTTCOMM_UST_CALIBRATE_FAIL;
3122 goto error;
3123 }
3124 break;
3125 }
54d01ffb 3126 default:
1ab1ea0b 3127 ret = LTTCOMM_UND;
54d01ffb
DG
3128 goto error;
3129 }
33a2b854 3130
54d01ffb 3131 ret = LTTCOMM_OK;
33a2b854 3132
54d01ffb
DG
3133error:
3134 return ret;
3135}
7d29a247 3136
54d01ffb
DG
3137/*
3138 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3139 */
3140static int cmd_register_consumer(struct ltt_session *session, int domain,
3141 char *sock_path)
3142{
3143 int ret, sock;
b389abbe 3144
54d01ffb
DG
3145 switch (domain) {
3146 case LTTNG_DOMAIN_KERNEL:
3147 /* Can't register a consumer if there is already one */
48c4f28c 3148 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG
3149 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3150 goto error;
3151 }
3152
3153 sock = lttcomm_connect_unix_sock(sock_path);
3154 if (sock < 0) {
3155 ret = LTTCOMM_CONNECT_FAIL;
3156 goto error;
3157 }
3158
3159 session->kernel_session->consumer_fd = sock;
3160 break;
3161 default:
3162 /* TODO: Userspace tracing */
1ab1ea0b 3163 ret = LTTCOMM_UND;
54d01ffb
DG
3164 goto error;
3165 }
3166
3167 ret = LTTCOMM_OK;
3168
3169error:
3170 return ret;
3171}
3172
3173/*
3174 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3175 */
3176static ssize_t cmd_list_domains(struct ltt_session *session,
3177 struct lttng_domain **domains)
3178{
b551a063 3179 int ret, index = 0;
54d01ffb
DG
3180 ssize_t nb_dom = 0;
3181
3182 if (session->kernel_session != NULL) {
b551a063 3183 DBG3("Listing domains found kernel domain");
54d01ffb
DG
3184 nb_dom++;
3185 }
3186
b551a063
DG
3187 if (session->ust_session != NULL) {
3188 DBG3("Listing domains found UST global domain");
3189 nb_dom++;
3190 }
54d01ffb 3191
b551a063 3192 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG
3193 if (*domains == NULL) {
3194 ret = -LTTCOMM_FATAL;
3195 goto error;
3196 }
3197
b551a063
DG