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Merge branch 'master' into benchmark
[lttng-tools.git] / 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 *
54d01ffb
DG		 5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
91d76f53 8 *
54d01ffb
DG		 9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
91d76f53 13 *
54d01ffb
DG		 14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG		 17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
fac6795d
DG		 26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
0fdd1e2c 30#include <sys/mman.h>
b73401da 31#include <sys/mount.h>
1e307fab 32#include <sys/resource.h>
fac6795d
DG		 33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
0fdd1e2c
DG		 36#include <sys/wait.h>
37#include <urcu/futex.h>
fac6795d 38#include <unistd.h>
3bd1e081 39#include <config.h>
fac6795d 40
3bd1e081 41#include <lttng-consumerd.h>
bec39940 42#include <lttng-ht.h>
e88129fc 43#include <lttng-sessiond-comm.h>
3bd1e081 44#include <lttng/lttng-consumer.h>
2bdd86d4 45
1e307fab 46#include <lttngerr.h>
60b6c79c 47#include <runas.h>
fac6795d 48
54d01ffb 49#include "channel.h"
5eb91c98 50#include "compat/poll.h"
b579acd9 51#include "context.h"
54d01ffb 52#include "event.h"
099e26bd 53#include "futex.h"
4771f025 54#include "kernel.h"
32258573 55#include "lttng-sessiond.h"
0fdd1e2c 56#include "shm.h"
56fff090 57#include "ust-app.h"
1e307fab 58#include "ust-ctl.h"
8e68d1c8 59#include "utils.h"
fac6795d 60
ebaeda94
MD		 61#define CONSUMERD_FILE "lttng-consumerd"
62
3bd1e081
MD		 63struct consumer_data {
64 enum lttng_consumer_type type;
65
66 pthread_t thread; /* Worker thread interacting with the consumer */
67 sem_t sem;
68
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex;
71 pid_t pid;
72
73 int err_sock;
74 int cmd_sock;
75
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path[PATH_MAX];
78 char cmd_unix_sock_path[PATH_MAX];
79};
fac6795d 80
b25a8868
DG		 81#include "benchmark.h"
82
75462a81 83/* Const values */
686204ab 84const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 85const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD		 86const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
87const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
88
fac6795d 89/* Variables */
1d4b027a 90int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 91int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 92int opt_quiet; /* Not static for lttngerr.h */
d063d709 93
fac6795d
DG		 94const char *progname;
95const char *opt_tracing_group;
5b8719f5 96static int opt_sig_parent;
fac6795d 97static int opt_daemon;
4fba7219 98static int opt_no_kernel;
fac6795d 99static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 100static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 101static char *rundir;
3bd1e081
MD		 102
103/* Consumer daemon specific control data */
104static struct consumer_data kconsumer_data = {
105 .type = LTTNG_CONSUMER_KERNEL,
7753dea8
MD		 106 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 108};
7753dea8
MD		 109static struct consumer_data ustconsumer64_data = {
110 .type = LTTNG_CONSUMER64_UST,
111 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
3bd1e081 113};
7753dea8
MD		 114static struct consumer_data ustconsumer32_data = {
115 .type = LTTNG_CONSUMER32_UST,
116 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
117 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 118};
119
099e26bd 120static int dispatch_thread_exit;
fac6795d 121
54d01ffb
DG		 122/* Global application Unix socket path */
123static char apps_unix_sock_path[PATH_MAX];
124/* Global client Unix socket path */
125static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 126/* global wait shm path for UST */
127static char wait_shm_path[PATH_MAX];
fac6795d 128
1d4b027a 129/* Sockets and FDs */
d6f42150
DG		 130static int client_sock;
131static int apps_sock;
20fe2104 132static int kernel_tracer_fd;
7a485870 133static int kernel_poll_pipe[2];
1d4b027a 134
273ea72c
DG		 135/*
136 * Quit pipe for all threads. This permits a single cancellation point
137 * for all threads when receiving an event on the pipe.
138 */
139static int thread_quit_pipe[2];
140
099e26bd
DG		 141/*
142 * This pipe is used to inform the thread managing application communication
143 * that a command is queued and ready to be processed.
144 */
145static int apps_cmd_pipe[2];
146
1d4b027a 147/* Pthread, Mutexes and Semaphores */
1d4b027a 148static pthread_t apps_thread;
099e26bd 149static pthread_t reg_apps_thread;
1d4b027a 150static pthread_t client_thread;
7a485870 151static pthread_t kernel_thread;
099e26bd 152static pthread_t dispatch_thread;
5eb91c98 153
fac6795d 154
099e26bd
DG		 155/*
156 * UST registration command queue. This queue is tied with a futex and uses a N
157 * wakers / 1 waiter implemented and detailed in futex.c/.h
158 *
159 * The thread_manage_apps and thread_dispatch_ust_registration interact with
160 * this queue and the wait/wake scheme.
161 */
162static struct ust_cmd_queue ust_cmd_queue;
163
b5541356
DG		 164/*
165 * Pointer initialized before thread creation.
166 *
167 * This points to the tracing session list containing the session count and a
168 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
169 * MUST NOT be taken if you call a public function in session.c.
04ea676f 170 *
d063d709 171 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 172 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 173 */
174static struct ltt_session_list *session_list_ptr;
175
7753dea8
MD		 176int ust_consumerd64_fd = -1;
177int ust_consumerd32_fd = -1;
178
fb6f1fa2
YB		 179static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
180static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
181static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
182static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD		 183
184static
7753dea8 185void setup_consumerd_path(void)
fb09408a 186{
fc7a59ce 187 const char *bin, *libdir;
fb09408a 188
7753dea8
MD		 189 /*
190 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 191 * native architecture size consumer if CONFIG_CONSUMER*_PATH
192 * has not been defined.
7753dea8 193 */
ebaeda94 194#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 195 if (!consumerd32_bin[0]) {
196 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 197 }
198 if (!consumerd32_libdir[0]) {
199 consumerd32_libdir = INSTALL_LIB_PATH;
200 }
201#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 202 if (!consumerd64_bin[0]) {
203 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 204 }
ebaeda94
MD		 205 if (!consumerd64_libdir[0]) {
206 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 207 }
208#else
209#error "Unknown bitness"
210#endif
211
fb09408a
MD		 212 /*
213 * runtime env. var. overrides the build default.
214 */
fc7a59ce
AM		 215 bin = getenv("LTTNG_CONSUMERD32_BIN");
216 if (bin) {
217 consumerd32_bin = bin;
7753dea8 218 }
fc7a59ce
AM		 219 bin = getenv("LTTNG_CONSUMERD64_BIN");
220 if (bin) {
221 consumerd64_bin = bin;
ebaeda94
MD		 222 }
223 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
224 if (libdir) {
225 consumerd32_libdir = libdir;
226 }
227 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
228 if (libdir) {
229 consumerd64_libdir = libdir;
fb09408a
MD		 230 }
231}
232
5eb91c98
DG		 233/*
234 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
235 */
236static int create_thread_poll_set(struct lttng_poll_event *events,
237 unsigned int size)
238{
239 int ret;
240
241 if (events == NULL || size == 0) {
242 ret = -1;
243 goto error;
244 }
245
246 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
247 if (ret < 0) {
248 goto error;
249 }
250
251 /* Add quit pipe */
252 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
253 if (ret < 0) {
254 goto error;
255 }
256
257 return 0;
258
259error:
260 return ret;
261}
262
263/*
264 * Check if the thread quit pipe was triggered.
265 *
266 * Return 1 if it was triggered else 0;
267 */
268static int check_thread_quit_pipe(int fd, uint32_t events)
269{
270 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
271 return 1;
272 }
273
274 return 0;
275}
276
0fdd1e2c
DG		 277/*
278 * Remove modules in reverse load order.
279 */
280static int modprobe_remove_kernel_modules(void)
281{
282 int ret = 0, i;
283 char modprobe[256];
284
285 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
286 ret = snprintf(modprobe, sizeof(modprobe),
24b487b8 287 "/sbin/modprobe -r -q %s",
0fdd1e2c
DG		 288 kernel_modules_list[i].name);
289 if (ret < 0) {
24b487b8 290 perror("snprintf modprobe -r");
0fdd1e2c
DG		 291 goto error;
292 }
293 modprobe[sizeof(modprobe) - 1] = '\0';
294 ret = system(modprobe);
295 if (ret == -1) {
24b487b8 296 ERR("Unable to launch modprobe -r for module %s",
0fdd1e2c
DG		 297 kernel_modules_list[i].name);
298 } else if (kernel_modules_list[i].required
299 && WEXITSTATUS(ret) != 0) {
300 ERR("Unable to remove module %s",
301 kernel_modules_list[i].name);
302 } else {
303 DBG("Modprobe removal successful %s",
304 kernel_modules_list[i].name);
305 }
306 }
307
308error:
309 return ret;
310}
311
312/*
313 * Return group ID of the tracing group or -1 if not found.
314 */
996b65c8
MD		 315static gid_t allowed_group(void)
316{
317 struct group *grp;
318
274e143b
MD		 319 if (opt_tracing_group) {
320 grp = getgrnam(opt_tracing_group);
321 } else {
322 grp = getgrnam(default_tracing_group);
323 }
996b65c8
MD		 324 if (!grp) {
325 return -1;
326 } else {
327 return grp->gr_gid;
328 }
329}
330
273ea72c 331/*
5eb91c98 332 * Init thread quit pipe.
273ea72c
DG		 333 *
334 * Return -1 on error or 0 if all pipes are created.
335 */
336static int init_thread_quit_pipe(void)
337{
338 int ret;
339
340 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
341 if (ret < 0) {
342 perror("thread quit pipe");
343 goto error;
344 }
345
346error:
347 return ret;
348}
349
fac6795d 350/*
d063d709
DG		 351 * Complete teardown of a kernel session. This free all data structure related
352 * to a kernel session and update counter.
fac6795d 353 */
1d4b027a 354static void teardown_kernel_session(struct ltt_session *session)
fac6795d 355{
8f7a84dd
DG		 356 if (!session->kernel_session) {
357 DBG3("No kernel session when tearingdown session");
84ea9c99 358 return;
8f7a84dd 359 }
d9800920 360
84ea9c99 361 DBG("Tearing down kernel session");
d9800920 362
84ea9c99
MD		 363 /*
364 * If a custom kernel consumer was registered, close the socket before
365 * tearing down the complete kernel session structure
366 */
367 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
368 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 369 }
84ea9c99
MD		 370
371 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 372}
373
f6a9efaa
DG		 374/*
375 * Complete teardown of all UST sessions. This will free everything on his path
376 * and destroy the core essence of all ust sessions :)
377 */
378static void teardown_ust_session(struct ltt_session *session)
379{
84cd17c6
MD		 380 int ret;
381
8f7a84dd
DG		 382 if (!session->ust_session) {
383 DBG3("No UST session when tearingdown session");
f470a390 384 return;
8f7a84dd
DG		 385 }
386
f6a9efaa
DG		 387 DBG("Tearing down UST session(s)");
388
84cd17c6
MD		 389 ret = ust_app_destroy_trace_all(session->ust_session);
390 if (ret) {
391 ERR("Error in ust_app_destroy_trace_all");
392 }
8f7a84dd 393
f6a9efaa
DG		 394 trace_ust_destroy_session(session->ust_session);
395}
396
099e26bd
DG		 397/*
398 * Stop all threads by closing the thread quit pipe.
399 */
cf3af59e
MD		 400static void stop_threads(void)
401{
5eb91c98
DG		 402 int ret;
403
cf3af59e
MD		 404 /* Stopping all threads */
405 DBG("Terminating all threads");
54d01ffb 406 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 407 if (ret < 0) {
408 ERR("write error on thread quit pipe");
409 }
410
099e26bd
DG		 411 /* Dispatch thread */
412 dispatch_thread_exit = 1;
413 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 414}
415
fac6795d 416/*
d063d709 417 * Cleanup the daemon
fac6795d 418 */
cf3af59e 419static void cleanup(void)
fac6795d 420{
1d4b027a
DG		 421 int ret;
422 char *cmd;
af9737e9 423 struct ltt_session *sess, *stmp;
fac6795d 424
1d4b027a 425 DBG("Cleaning up");
e07ae692 426
67e40797
DG		 427 DBG("Removing %s directory", rundir);
428 ret = asprintf(&cmd, "rm -rf %s", rundir);
429 if (ret < 0) {
430 ERR("asprintf failed. Something is really wrong!");
431 }
5461b305 432
67e40797
DG		 433 /* Remove lttng run directory */
434 ret = system(cmd);
435 if (ret < 0) {
436 ERR("Unable to clean %s", rundir);
1d4b027a 437 }
67e40797 438 free(cmd);
5461b305 439
1d4b027a 440 DBG("Cleaning up all session");
fac6795d 441
b5541356 442 /* Destroy session list mutex */
273ea72c
DG		 443 if (session_list_ptr != NULL) {
444 pthread_mutex_destroy(&session_list_ptr->lock);
445
446 /* Cleanup ALL session */
54d01ffb
DG		 447 cds_list_for_each_entry_safe(sess, stmp,
448 &session_list_ptr->head, list) {
273ea72c 449 teardown_kernel_session(sess);
f6a9efaa
DG		 450 teardown_ust_session(sess);
451 free(sess);
273ea72c
DG		 452 }
453 }
454
099e26bd 455 DBG("Closing all UST sockets");
56fff090 456 ust_app_clean_list();
099e26bd 457
3bd1e081 458 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 459
4fba7219
DG		 460 if (is_root && !opt_no_kernel) {
461 DBG2("Closing kernel fd");
462 close(kernel_tracer_fd);
2f50c8a3
DG		 463 DBG("Unloading kernel modules");
464 modprobe_remove_kernel_modules();
465 }
b25a8868 466
5eb91c98
DG		 467 close(thread_quit_pipe[0]);
468 close(thread_quit_pipe[1]);
dab4c8a1 469
3c6bae61
DG		 470 /* OUTPUT BENCHMARK RESULTS */
471 bench_init();
472
62d53818
DG		 473 if (getenv("BENCH_UST_NOTIFY")) {
474 bench_print_ust_notification();
475 }
476
477 if (getenv("BENCH_UST_REGISTER")) {
478 bench_print_ust_register();
ccca3fea 479 bench_print_ust_unregister();
62d53818
DG		 480 }
481
482 if (getenv("BENCH_BOOT_PROCESS")) {
483 bench_print_boot_process();
484 }
3c6bae61
DG		 485
486 bench_close();
487 /* END BENCHMARK */
bb3037a9 488
421cb601 489 /* <fun> */
f56a39af 490 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG		 491 "Matthew, BEET driven development works!%c[%dm",
492 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
493 /* </fun> */
fac6795d
DG		 494}
495
e065084a 496/*
d063d709 497 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 498 *
d063d709 499 * Return lttcomm error code.
e065084a
DG		 500 */
501static int send_unix_sock(int sock, void *buf, size_t len)
502{
503 /* Check valid length */
504 if (len <= 0) {
505 return -1;
506 }
507
508 return lttcomm_send_unix_sock(sock, buf, len);
509}
510
5461b305 511/*
d063d709 512 * Free memory of a command context structure.
5461b305 513 */
a2fb29a5 514static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 515{
a2fb29a5
DG		 516 DBG("Clean command context structure");
517 if (*cmd_ctx) {
518 if ((*cmd_ctx)->llm) {
519 free((*cmd_ctx)->llm);
5461b305 520 }
a2fb29a5
DG		 521 if ((*cmd_ctx)->lsm) {
522 free((*cmd_ctx)->lsm);
5461b305 523 }
a2fb29a5
DG		 524 free(*cmd_ctx);
525 *cmd_ctx = NULL;
5461b305
DG		 526 }
527}
528
f3ed775e 529/*
d063d709 530 * Send all stream fds of kernel channel to the consumer.
f3ed775e 531 */
2bdd86d4 532static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD		 533 int sock, struct ltt_kernel_channel *channel,
534 uid_t uid, gid_t gid)
f3ed775e
DG		 535{
536 int ret;
f3ed775e 537 struct ltt_kernel_stream *stream;
3bd1e081 538 struct lttcomm_consumer_msg lkm;
f3ed775e 539
3bd1e081 540 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 541 channel->channel->name);
7a485870 542
3bd1e081
MD		 543 /* Send channel */
544 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
545 lkm.u.channel.channel_key = channel->fd;
546 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
547 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 548 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 549 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 550 if (ret < 0) {
3bd1e081 551 perror("send consumer channel");
f3ed775e
DG		 552 goto error;
553 }
554
3bd1e081 555 /* Send streams */
7a485870 556 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 557 if (!stream->fd) {
558 continue;
559 }
560 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
561 lkm.u.stream.channel_key = channel->fd;
562 lkm.u.stream.stream_key = stream->fd;
563 lkm.u.stream.state = stream->state;
564 lkm.u.stream.output = channel->channel->attr.output;
565 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 566 lkm.u.stream.uid = uid;
567 lkm.u.stream.gid = gid;
3bd1e081
MD		 568 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
569 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
570 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
571 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
572 if (ret < 0) {
573 perror("send consumer stream");
574 goto error;
575 }
576 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
577 if (ret < 0) {
578 perror("send consumer stream ancillary data");
579 goto error;
f3ed775e
DG		 580 }
581 }
582
3bd1e081 583 DBG("consumer channel streams sent");
f3ed775e
DG		 584
585 return 0;
586
587error:
588 return ret;
589}
590
591/*
d063d709 592 * Send all stream fds of the kernel session to the consumer.
f3ed775e 593 */
2bdd86d4 594static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 595 struct ltt_kernel_session *session)
f3ed775e
DG		 596{
597 int ret;
598 struct ltt_kernel_channel *chan;
3bd1e081
MD		 599 struct lttcomm_consumer_msg lkm;
600 int sock = session->consumer_fd;
7a485870
DG		 601
602 DBG("Sending metadata stream fd");
603
2bdd86d4 604 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 605 if (session->consumer_fd == 0) {
3bd1e081 606 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 607 }
608
7a485870 609 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 610 /* Send metadata channel fd */
611 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
612 lkm.u.channel.channel_key = session->metadata->fd;
613 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
614 lkm.u.channel.mmap_len = 0; /* for kernel */
615 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
616 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
617 if (ret < 0) {
618 perror("send consumer channel");
619 goto error;
620 }
621
622 /* Send metadata stream fd */
623 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
624 lkm.u.stream.channel_key = session->metadata->fd;
625 lkm.u.stream.stream_key = session->metadata_stream_fd;
626 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
627 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
628 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 629 lkm.u.stream.uid = session->uid;
630 lkm.u.stream.gid = session->gid;
3bd1e081
MD		 631 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
632 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
633 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
634 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
7a485870 635 if (ret < 0) {
3bd1e081
MD		 636 perror("send consumer stream");
637 goto error;
638 }
639 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 640 if (ret < 0) {
3bd1e081 641 perror("send consumer stream");
7a485870
DG		 642 goto error;
643 }
644 }
f3ed775e 645
f3ed775e 646 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD		 647 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
648 session->uid, session->gid);
f3ed775e 649 if (ret < 0) {
7a485870 650 goto error;
f3ed775e
DG		 651 }
652 }
653
2bdd86d4 654 DBG("consumer fds (metadata and channel streams) sent");
7a485870 655
f3ed775e
DG		 656 return 0;
657
658error:
659 return ret;
660}
661
fac6795d 662/*
0fdd1e2c 663 * Notify UST applications using the shm mmap futex.
fac6795d 664 */
0fdd1e2c 665static int notify_ust_apps(int active)
fac6795d 666{
0fdd1e2c 667 char *wait_shm_mmap;
fac6795d 668
0fdd1e2c 669 DBG("Notifying applications of session daemon state: %d", active);
fac6795d 670
62d53818
DG		 671 tracepoint(ust_notify_apps_start);
672
0fdd1e2c
DG		 673 /* See shm.c for this call implying mmap, shm and futex calls */
674 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
675 if (wait_shm_mmap == NULL) {
fac6795d
DG		 676 goto error;
677 }
678
0fdd1e2c
DG		 679 /* Wake waiting process */
680 futex_wait_update((int32_t *) wait_shm_mmap, active);
681
62d53818
DG		 682 tracepoint(ust_notify_apps_stop);
683
0fdd1e2c
DG		 684 /* Apps notified successfully */
685 return 0;
fac6795d
DG		 686
687error:
0fdd1e2c 688 return -1;
fac6795d
DG		 689}
690
e065084a 691/*
d063d709
DG		 692 * Setup the outgoing data buffer for the response (llm) by allocating the
693 * right amount of memory and copying the original information from the lsm
694 * structure.
ca95a216 695 *
d063d709 696 * Return total size of the buffer pointed by buf.
ca95a216 697 */
5461b305 698static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 699{
f3ed775e 700 int ret, buf_size;
ca95a216 701
f3ed775e 702 buf_size = size;
5461b305 703
ba7f0ae5 704 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 705 if (cmd_ctx->llm == NULL) {
ba7f0ae5 706 perror("zmalloc");
5461b305 707 ret = -ENOMEM;
ca95a216
DG		 708 goto error;
709 }
710
5461b305
DG		 711 /* Copy common data */
712 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 713 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 714
5461b305
DG		 715 cmd_ctx->llm->data_size = size;
716 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
717
ca95a216
DG		 718 return buf_size;
719
720error:
721 return ret;
722}
723
7a485870 724/*
5eb91c98 725 * Update the kernel poll set of all channel fd available over all tracing
d063d709 726 * session. Add the wakeup pipe at the end of the set.
7a485870 727 */
5eb91c98 728static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 729{
5eb91c98 730 int ret;
7a485870
DG		 731 struct ltt_session *session;
732 struct ltt_kernel_channel *channel;
733
5eb91c98 734 DBG("Updating kernel poll set");
7a485870 735
54d01ffb 736 session_lock_list();
b5541356 737 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 738 session_lock(session);
7a485870 739 if (session->kernel_session == NULL) {
54d01ffb 740 session_unlock(session);
7a485870
DG		 741 continue;
742 }
7a485870 743
54d01ffb
DG		 744 cds_list_for_each_entry(channel,
745 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 746 /* Add channel fd to the kernel poll set */
747 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
748 if (ret < 0) {
54d01ffb 749 session_unlock(session);
5eb91c98
DG		 750 goto error;
751 }
752 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 753 }
54d01ffb 754 session_unlock(session);
7a485870 755 }
54d01ffb 756 session_unlock_list();
7a485870 757
5eb91c98 758 return 0;
7a485870
DG		 759
760error:
54d01ffb 761 session_unlock_list();
7a485870
DG		 762 return -1;
763}
764
765/*
54d01ffb 766 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 767 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 768 *
d063d709 769 * Useful for CPU hotplug feature.
7a485870 770 */
2bdd86d4 771static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 772{
773 int ret = 0;
774 struct ltt_session *session;
775 struct ltt_kernel_channel *channel;
776
777 DBG("Updating kernel streams for channel fd %d", fd);
778
54d01ffb 779 session_lock_list();
b5541356 780 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 781 session_lock(session);
7a485870 782 if (session->kernel_session == NULL) {
54d01ffb 783 session_unlock(session);
7a485870
DG		 784 continue;
785 }
d9800920
DG		 786
787 /* This is not suppose to be 0 but this is an extra security check */
788 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 789 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 790 }
791
5eb91c98
DG		 792 cds_list_for_each_entry(channel,
793 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 794 if (channel->fd == fd) {
795 DBG("Channel found, updating kernel streams");
796 ret = kernel_open_channel_stream(channel);
797 if (ret < 0) {
b3c750d2 798 goto error;
7a485870 799 }
d9800920 800
7a485870 801 /*
5eb91c98
DG		 802 * Have we already sent fds to the consumer? If yes, it means
803 * that tracing is started so it is safe to send our updated
804 * stream fds.
7a485870 805 */
3bd1e081 806 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 807 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD		 808 session->kernel_session->consumer_fd, channel,
809 session->uid, session->gid);
7a485870 810 if (ret < 0) {
b3c750d2 811 goto error;
7a485870
DG		 812 }
813 }
b3c750d2 814 goto error;
7a485870
DG		 815 }
816 }
54d01ffb 817 session_unlock(session);
7a485870 818 }
54d01ffb 819 session_unlock_list();
b3c750d2 820 return ret;
7a485870 821
b3c750d2 822error:
54d01ffb
DG		 823 session_unlock(session);
824 session_unlock_list();
7a485870
DG		 825 return ret;
826}
827
487cf67c
DG		 828/*
829 * For each tracing session, update newly registered apps.
830 */
831static void update_ust_app(int app_sock)
832{
833 struct ltt_session *sess, *stmp;
834
835 /* For all tracing session(s) */
836 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
421cb601
DG		 837 if (sess->ust_session) {
838 ust_app_global_update(sess->ust_session, app_sock);
839 }
487cf67c
DG		 840 }
841}
842
7a485870 843/*
d063d709 844 * This thread manage event coming from the kernel.
7a485870 845 *
d063d709
DG		 846 * Features supported in this thread:
847 * -) CPU Hotplug
7a485870
DG		 848 */
849static void *thread_manage_kernel(void *data)
850{
5eb91c98
DG		 851 int ret, i, pollfd, update_poll_flag = 1;
852 uint32_t revents, nb_fd;
7a485870 853 char tmp;
5eb91c98 854 struct lttng_poll_event events;
7a485870 855
b25a8868
DG		 856 tracepoint(sessiond_th_kern_start);
857
7a485870
DG		 858 DBG("Thread manage kernel started");
859
5eb91c98
DG		 860 ret = create_thread_poll_set(&events, 2);
861 if (ret < 0) {
862 goto error;
863 }
864
865 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
866 if (ret < 0) {
867 goto error;
868 }
869
7a485870
DG		 870 while (1) {
871 if (update_poll_flag == 1) {
5f822d0a
DG		 872 /*
873 * Reset number of fd in the poll set. Always 2 since there is the thread
874 * quit pipe and the kernel pipe.
875 */
876 events.nb_fd = 2;
877
5eb91c98
DG		 878 ret = update_kernel_poll(&events);
879 if (ret < 0) {
7a485870
DG		 880 goto error;
881 }
882 update_poll_flag = 0;
883 }
884
5eb91c98
DG		 885 nb_fd = LTTNG_POLL_GETNB(&events);
886
887 DBG("Thread kernel polling on %d fds", nb_fd);
888
889 /* Zeroed the poll events */
890 lttng_poll_reset(&events);
7a485870 891
b25a8868
DG		 892 tracepoint(sessiond_th_kern_poll);
893
7a485870 894 /* Poll infinite value of time */
5eb91c98 895 ret = lttng_poll_wait(&events, -1);
7a485870 896 if (ret < 0) {
7a485870
DG		 897 goto error;
898 } else if (ret == 0) {
899 /* Should not happen since timeout is infinite */
85611738
DG		 900 ERR("Return value of poll is 0 with an infinite timeout.\n"
901 "This should not have happened! Continuing...");
7a485870
DG		 902 continue;
903 }
904
5eb91c98
DG		 905 for (i = 0; i < nb_fd; i++) {
906 /* Fetch once the poll data */
907 revents = LTTNG_POLL_GETEV(&events, i);
908 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 909
5eb91c98
DG		 910 /* Thread quit pipe has been closed. Killing thread. */
911 ret = check_thread_quit_pipe(pollfd, revents);
912 if (ret) {
913 goto error;
914 }
7a485870 915
5eb91c98
DG		 916 /* Check for data on kernel pipe */
917 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
918 ret = read(kernel_poll_pipe[0], &tmp, 1);
919 update_poll_flag = 1;
920 continue;
921 } else {
922 /*
923 * New CPU detected by the kernel. Adding kernel stream to
924 * kernel session and updating the kernel consumer
925 */
926 if (revents & LPOLLIN) {
2bdd86d4 927 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 928 if (ret < 0) {
929 continue;
930 }
931 break;
932 /*
933 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
934 * and unregister kernel stream at this point.
935 */
7a485870 936 }
7a485870
DG		 937 }
938 }
939 }
940
941error:
942 DBG("Kernel thread dying");
273ea72c
DG		 943 close(kernel_poll_pipe[0]);
944 close(kernel_poll_pipe[1]);
5eb91c98
DG		 945
946 lttng_poll_clean(&events);
947
7a485870
DG		 948 return NULL;
949}
950
1d4b027a 951/*
3bd1e081 952 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 953 */
3bd1e081 954static void *thread_manage_consumer(void *data)
1d4b027a 955{
5eb91c98
DG		 956 int sock = 0, i, ret, pollfd;
957 uint32_t revents, nb_fd;
1d4b027a 958 enum lttcomm_return_code code;
5eb91c98 959 struct lttng_poll_event events;
3bd1e081 960 struct consumer_data *consumer_data = data;
1d4b027a 961
b25a8868
DG		 962 tracepoint(sessiond_th_kcon_start);
963
3bd1e081 964 DBG("[thread] Manage consumer started");
1d4b027a 965
3bd1e081 966 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 967 if (ret < 0) {
968 goto error;
969 }
970
5eb91c98
DG		 971 /*
972 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
973 * Nothing more will be added to this poll set.
974 */
975 ret = create_thread_poll_set(&events, 2);
976 if (ret < 0) {
977 goto error;
978 }
273ea72c 979
3bd1e081 980 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 981 if (ret < 0) {
982 goto error;
983 }
273ea72c 984
5eb91c98 985 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c 986
b25a8868
DG		 987 tracepoint(sessiond_th_kcon_poll);
988
273ea72c 989 /* Inifinite blocking call, waiting for transmission */
5eb91c98 990 ret = lttng_poll_wait(&events, -1);
273ea72c 991 if (ret < 0) {
273ea72c
DG		 992 goto error;
993 }
994
5eb91c98
DG		 995 for (i = 0; i < nb_fd; i++) {
996 /* Fetch once the poll data */
997 revents = LTTNG_POLL_GETEV(&events, i);
998 pollfd = LTTNG_POLL_GETFD(&events, i);
999
1000 /* Thread quit pipe has been closed. Killing thread. */
1001 ret = check_thread_quit_pipe(pollfd, revents);
1002 if (ret) {
1003 goto error;
1004 }
1005
1006 /* Event on the registration socket */
3bd1e081 1007 if (pollfd == consumer_data->err_sock) {
5eb91c98 1008 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1009 ERR("consumer err socket poll error");
5eb91c98
DG		 1010 goto error;
1011 }
1012 }
273ea72c
DG		 1013 }
1014
3bd1e081 1015 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 1016 if (sock < 0) {
1017 goto error;
1018 }
1019
3bd1e081 1020 DBG2("Receiving code from consumer err_sock");
ee0b0061 1021
712ea556 1022 /* Getting status code from kconsumerd */
54d01ffb
DG		 1023 ret = lttcomm_recv_unix_sock(sock, &code,
1024 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 1025 if (ret <= 0) {
1026 goto error;
1027 }
1028
3bd1e081
MD		 1029 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1030 consumer_data->cmd_sock =
1031 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1032 if (consumer_data->cmd_sock < 0) {
1033 sem_post(&consumer_data->sem);
48842b30 1034 PERROR("consumer connect");
1d4b027a
DG		 1035 goto error;
1036 }
1037 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 1038 sem_post(&consumer_data->sem);
1039 DBG("consumer command socket ready");
1d4b027a 1040 } else {
3bd1e081 1041 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 1042 lttcomm_get_readable_code(-code));
1043 goto error;
1044 }
1045
54d01ffb 1046 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 1047 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 1048 if (ret < 0) {
72079cae
DG		 1049 goto error;
1050 }
1051
5eb91c98
DG		 1052 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1053 if (ret < 0) {
72079cae 1054 goto error;
5eb91c98
DG		 1055 }
1056
1057 /* Update number of fd */
1058 nb_fd = LTTNG_POLL_GETNB(&events);
1059
1060 /* Inifinite blocking call, waiting for transmission */
1061 ret = lttng_poll_wait(&events, -1);
1062 if (ret < 0) {
72079cae
DG		 1063 goto error;
1064 }
1065
5eb91c98
DG		 1066 for (i = 0; i < nb_fd; i++) {
1067 /* Fetch once the poll data */
1068 revents = LTTNG_POLL_GETEV(&events, i);
1069 pollfd = LTTNG_POLL_GETFD(&events, i);
1070
1071 /* Thread quit pipe has been closed. Killing thread. */
1072 ret = check_thread_quit_pipe(pollfd, revents);
1073 if (ret) {
1074 goto error;
1075 }
1076
1077 /* Event on the kconsumerd socket */
1078 if (pollfd == sock) {
1079 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1080 ERR("consumer err socket second poll error");
5eb91c98
DG		 1081 goto error;
1082 }
1083 }
1084 }
1085
712ea556 1086 /* Wait for any kconsumerd error */
54d01ffb
DG		 1087 ret = lttcomm_recv_unix_sock(sock, &code,
1088 sizeof(enum lttcomm_return_code));
712ea556 1089 if (ret <= 0) {
3bd1e081 1090 ERR("consumer closed the command socket");
712ea556 1091 goto error;
6f61d021 1092 }
1d4b027a 1093
3bd1e081 1094 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1095
1d4b027a 1096error:
3bd1e081
MD		 1097 DBG("consumer thread dying");
1098 close(consumer_data->err_sock);
1099 close(consumer_data->cmd_sock);
5eb91c98 1100 close(sock);
273ea72c 1101
3bd1e081
MD		 1102 unlink(consumer_data->err_unix_sock_path);
1103 unlink(consumer_data->cmd_unix_sock_path);
1104 consumer_data->pid = 0;
0177d773 1105
5eb91c98 1106 lttng_poll_clean(&events);
0177d773 1107
5eb91c98 1108 return NULL;
099e26bd
DG		 1109}
1110
099e26bd
DG		 1111/*
1112 * This thread manage application communication.
1d4b027a
DG		 1113 */
1114static void *thread_manage_apps(void *data)
099e26bd 1115{
5eb91c98
DG		 1116 int i, ret, pollfd;
1117 uint32_t revents, nb_fd;
099e26bd 1118 struct ust_command ust_cmd;
5eb91c98 1119 struct lttng_poll_event events;
099e26bd 1120
85c434ee
DG		 1121 tracepoint(sessiond_th_apps_start);
1122
099e26bd
DG		 1123 DBG("[thread] Manage application started");
1124
f6a9efaa
DG		 1125 rcu_register_thread();
1126 rcu_thread_online();
1127
5eb91c98
DG		 1128 ret = create_thread_poll_set(&events, 2);
1129 if (ret < 0) {
1130 goto error;
1131 }
099e26bd 1132
5eb91c98
DG		 1133 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1134 if (ret < 0) {
1135 goto error;
1136 }
099e26bd 1137
5eb91c98
DG		 1138 while (1) {
1139 /* Zeroed the events structure */
1140 lttng_poll_reset(&events);
0177d773 1141
5eb91c98 1142 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1143
1144 DBG("Apps thread polling on %d fds", nb_fd);
1145
85c434ee
DG		 1146 tracepoint(sessiond_th_apps_poll);
1147
099e26bd 1148 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1149 ret = lttng_poll_wait(&events, -1);
099e26bd 1150 if (ret < 0) {
099e26bd
DG		 1151 goto error;
1152 }
1153
5eb91c98
DG		 1154 for (i = 0; i < nb_fd; i++) {
1155 /* Fetch once the poll data */
1156 revents = LTTNG_POLL_GETEV(&events, i);
1157 pollfd = LTTNG_POLL_GETFD(&events, i);
1158
1159 /* Thread quit pipe has been closed. Killing thread. */
1160 ret = check_thread_quit_pipe(pollfd, revents);
1161 if (ret) {
099e26bd 1162 goto error;
5eb91c98 1163 }
62d53818 1164
5eb91c98
DG		 1165 /* Inspect the apps cmd pipe */
1166 if (pollfd == apps_cmd_pipe[0]) {
1167 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1168 ERR("Apps command pipe error");
0177d773 1169 goto error;
5eb91c98 1170 } else if (revents & LPOLLIN) {
dab4c8a1 1171 tracepoint(ust_register_read_start);
5eb91c98
DG		 1172 /* Empty pipe */
1173 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1174 if (ret < 0 || ret < sizeof(ust_cmd)) {
1175 perror("read apps cmd pipe");
1176 goto error;
1177 }
a89c7d1b 1178 tracepoint(ust_register_read_stop);
099e26bd 1179
a89c7d1b 1180 tracepoint(ust_register_add_start);
5eb91c98 1181 /* Register applicaton to the session daemon */
56fff090 1182 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1183 ust_cmd.sock);
88ff5b7f 1184 if (ret == -ENOMEM) {
5eb91c98 1185 goto error;
88ff5b7f
MD		 1186 } else if (ret < 0) {
1187 break;
5eb91c98 1188 }
a89c7d1b 1189 tracepoint(ust_register_add_stop);
85c434ee 1190
a89c7d1b 1191 tracepoint(ust_register_done_start);
acc7b41b
MD		 1192 /*
1193 * Add channel(s) and event(s) to newly registered apps
1194 * from lttng global UST domain.
1195 */
1196 update_ust_app(ust_cmd.sock);
1197
f2ca2e25 1198 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG		 1199 if (ret < 0) {
1200 /*
1201 * If the registration is not possible, we simply
1202 * unregister the apps and continue
1203 */
56fff090 1204 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1205 } else {
1206 /*
1207 * We just need here to monitor the close of the UST
1208 * socket and poll set monitor those by default.
1209 */
1210 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1211 if (ret < 0) {
1212 goto error;
1213 }
1214
54d01ffb
DG		 1215 DBG("Apps with sock %d added to poll set",
1216 ust_cmd.sock);
5eb91c98 1217 }
a89c7d1b 1218 tracepoint(ust_register_done_stop);
5eb91c98 1219 break;
0177d773 1220 }
5eb91c98
DG		 1221 } else {
1222 /*
54d01ffb
DG		 1223 * At this point, we know that a registered application made
1224 * the event at poll_wait.
5eb91c98
DG		 1225 */
1226 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
aa231298
DG		 1227 tracepoint(ust_unregister_start);
1228
5eb91c98
DG		 1229 /* Removing from the poll set */
1230 ret = lttng_poll_del(&events, pollfd);
1231 if (ret < 0) {
1232 goto error;
1233 }
099e26bd 1234
b9d9b220 1235 /* Socket closed on remote end. */
56fff090 1236 ust_app_unregister(pollfd);
aa231298
DG		 1237
1238 tracepoint(ust_unregister_stop);
5eb91c98 1239 break;
0177d773 1240 }
099e26bd
DG		 1241 }
1242 }
099e26bd
DG		 1243 }
1244
1245error:
1246 DBG("Application communication apps dying");
1247 close(apps_cmd_pipe[0]);
1248 close(apps_cmd_pipe[1]);
1249
5eb91c98 1250 lttng_poll_clean(&events);
099e26bd 1251
f6a9efaa
DG		 1252 rcu_thread_offline();
1253 rcu_unregister_thread();
099e26bd
DG		 1254 return NULL;
1255}
1256
1257/*
1258 * Dispatch request from the registration threads to the application
1259 * communication thread.
1260 */
1261static void *thread_dispatch_ust_registration(void *data)
1262{
1263 int ret;
1264 struct cds_wfq_node *node;
1265 struct ust_command *ust_cmd = NULL;
1266
85c434ee
DG		 1267 tracepoint(sessiond_th_dispatch_start);
1268
099e26bd
DG		 1269 DBG("[thread] Dispatch UST command started");
1270
1271 while (!dispatch_thread_exit) {
1272 /* Atomically prepare the queue futex */
1273 futex_nto1_prepare(&ust_cmd_queue.futex);
1274
1275 do {
85c434ee
DG		 1276 tracepoint(sessiond_th_dispatch_block);
1277
099e26bd
DG		 1278 /* Dequeue command for registration */
1279 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1280 if (node == NULL) {
00a17c97 1281 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1282 /* Continue thread execution */
1283 break;
1284 }
1285
62d53818
DG		 1286 tracepoint(ust_dispatch_register_start);
1287
099e26bd
DG		 1288 ust_cmd = caa_container_of(node, struct ust_command, node);
1289
2f50c8a3
DG		 1290 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1291 " gid:%d sock:%d name:%s (version %d.%d)",
1292 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1293 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1294 ust_cmd->sock, ust_cmd->reg_msg.name,
1295 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1296 /*
1297 * Inform apps thread of the new application registration. This
1298 * call is blocking so we can be assured that the data will be read
1299 * at some point in time or wait to the end of the world :)
1300 */
1301 ret = write(apps_cmd_pipe[1], ust_cmd,
1302 sizeof(struct ust_command));
1303 if (ret < 0) {
1304 perror("write apps cmd pipe");
1305 if (errno == EBADF) {
1306 /*
1307 * We can't inform the application thread to process
1308 * registration. We will exit or else application
1309 * registration will not occur and tracing will never
1310 * start.
1311 */
1312 goto error;
1313 }
1314 }
1315 free(ust_cmd);
1316 } while (node != NULL);
1317
62d53818
DG		 1318 tracepoint(ust_dispatch_register_stop);
1319
099e26bd
DG		 1320 /* Futex wait on queue. Blocking call on futex() */
1321 futex_nto1_wait(&ust_cmd_queue.futex);
1322 }
1323
1324error:
1325 DBG("Dispatch thread dying");
1326 return NULL;
1327}
1328
1329/*
1330 * This thread manage application registration.
1331 */
1332static void *thread_registration_apps(void *data)
1d4b027a 1333{
5eb91c98
DG		 1334 int sock = 0, i, ret, pollfd;
1335 uint32_t revents, nb_fd;
1336 struct lttng_poll_event events;
099e26bd
DG		 1337 /*
1338 * Get allocated in this thread, enqueued to a global queue, dequeued and
1339 * freed in the manage apps thread.
1340 */
1341 struct ust_command *ust_cmd = NULL;
1d4b027a 1342
62d53818 1343 tracepoint(sessiond_th_reg_start);
b25a8868 1344
099e26bd 1345 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1346
1347 ret = lttcomm_listen_unix_sock(apps_sock);
1348 if (ret < 0) {
1349 goto error;
1350 }
1351
5eb91c98
DG		 1352 /*
1353 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1354 * more will be added to this poll set.
1355 */
1356 ret = create_thread_poll_set(&events, 2);
1357 if (ret < 0) {
1358 goto error;
1359 }
273ea72c 1360
5eb91c98
DG		 1361 /* Add the application registration socket */
1362 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1363 if (ret < 0) {
1364 goto error;
1365 }
273ea72c 1366
1d4b027a 1367 /* Notify all applications to register */
0fdd1e2c
DG		 1368 ret = notify_ust_apps(1);
1369 if (ret < 0) {
1370 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1371 "Execution continues but there might be problem for already\n"
1372 "running applications that wishes to register.");
0fdd1e2c 1373 }
1d4b027a
DG		 1374
1375 while (1) {
1376 DBG("Accepting application registration");
273ea72c 1377
62d53818 1378 tracepoint(sessiond_th_reg_poll);
b25a8868 1379
5eb91c98
DG		 1380 nb_fd = LTTNG_POLL_GETNB(&events);
1381
273ea72c 1382 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1383 ret = lttng_poll_wait(&events, -1);
273ea72c 1384 if (ret < 0) {
273ea72c
DG		 1385 goto error;
1386 }
1387
5eb91c98
DG		 1388 for (i = 0; i < nb_fd; i++) {
1389 /* Fetch once the poll data */
1390 revents = LTTNG_POLL_GETEV(&events, i);
1391 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1392
5eb91c98
DG		 1393 /* Thread quit pipe has been closed. Killing thread. */
1394 ret = check_thread_quit_pipe(pollfd, revents);
1395 if (ret) {
90014c57
DG		 1396 goto error;
1397 }
62d53818 1398
5eb91c98
DG		 1399 /* Event on the registration socket */
1400 if (pollfd == apps_sock) {
1401 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1402 ERR("Register apps socket poll error");
1403 goto error;
1404 } else if (revents & LPOLLIN) {
dab4c8a1
DG		 1405 /* Registration starts here. Recording cycles */
1406 tracepoint(ust_register_start);
1d4b027a 1407
5eb91c98
DG		 1408 sock = lttcomm_accept_unix_sock(apps_sock);
1409 if (sock < 0) {
1410 goto error;
1411 }
099e26bd 1412
5eb91c98 1413 /* Create UST registration command for enqueuing */
ba7f0ae5 1414 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1415 if (ust_cmd == NULL) {
ba7f0ae5 1416 perror("ust command zmalloc");
5eb91c98
DG		 1417 goto error;
1418 }
1d4b027a 1419
5eb91c98
DG		 1420 /*
1421 * Using message-based transmissions to ensure we don't
1422 * have to deal with partially received messages.
1423 */
1424 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1425 sizeof(struct ust_register_msg));
1426 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1427 if (ret < 0) {
1428 perror("lttcomm_recv_unix_sock register apps");
1429 } else {
1430 ERR("Wrong size received on apps register");
1431 }
1432 free(ust_cmd);
1433 close(sock);
1434 continue;
1435 }
099e26bd 1436
5eb91c98 1437 ust_cmd->sock = sock;
099e26bd 1438
5eb91c98
DG		 1439 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1440 " gid:%d sock:%d name:%s (version %d.%d)",
1441 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1442 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1443 ust_cmd->sock, ust_cmd->reg_msg.name,
1444 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1445
5eb91c98
DG		 1446 /*
1447 * Lock free enqueue the registration request. The red pill
54d01ffb 1448 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1449 */
1450 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
62d53818 1451
5eb91c98
DG		 1452 /*
1453 * Wake the registration queue futex. Implicit memory
1454 * barrier with the exchange in cds_wfq_enqueue.
1455 */
1456 futex_nto1_wake(&ust_cmd_queue.futex);
dab4c8a1
DG		 1457
1458 tracepoint(ust_register_stop);
5eb91c98
DG		 1459 }
1460 }
90014c57 1461 }
1d4b027a
DG		 1462 }
1463
1464error:
0fdd1e2c
DG		 1465 DBG("UST Registration thread dying");
1466
1467 /* Notify that the registration thread is gone */
1468 notify_ust_apps(0);
1469
1470 close(apps_sock);
1471 close(sock);
273ea72c 1472 unlink(apps_unix_sock_path);
0fdd1e2c 1473
5eb91c98
DG		 1474 lttng_poll_clean(&events);
1475
1d4b027a
DG		 1476 return NULL;
1477}
1478
8c0faa1d 1479/*
3bd1e081 1480 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1481 * exec or it will fails.
8c0faa1d 1482 */
3bd1e081 1483static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1484{
1485 int ret;
ee0b0061
DG		 1486 struct timespec timeout;
1487
1488 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1489 timeout.tv_nsec = 0;
8c0faa1d
DG		 1490
1491 /* Setup semaphore */
3bd1e081 1492 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1493 if (ret < 0) {
3bd1e081 1494 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1495 goto error;
1496 }
8c0faa1d 1497
3bd1e081
MD		 1498 ret = pthread_create(&consumer_data->thread, NULL,
1499 thread_manage_consumer, consumer_data);
8c0faa1d 1500 if (ret != 0) {
3bd1e081 1501 PERROR("pthread_create consumer");
ee0b0061 1502 ret = -1;
8c0faa1d
DG		 1503 goto error;
1504 }
1505
ee0b0061
DG		 1506 /* Get time for sem_timedwait absolute timeout */
1507 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1508 if (ret < 0) {
3bd1e081 1509 PERROR("clock_gettime spawn consumer");
ee0b0061 1510 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1511 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1512 } else {
1513 /* Normal timeout if the gettime was successful */
1514 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1515 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1516 }
8c0faa1d 1517
ee0b0061
DG		 1518 if (ret < 0) {
1519 if (errno == ETIMEDOUT) {
1520 /*
1521 * Call has timed out so we kill the kconsumerd_thread and return
1522 * an error.
1523 */
3bd1e081
MD		 1524 ERR("The consumer thread was never ready. Killing it");
1525 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1526 if (ret < 0) {
3bd1e081 1527 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1528 }
1529 } else {
3bd1e081 1530 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1531 }
1532 goto error;
1533 }
1534
3bd1e081
MD		 1535 pthread_mutex_lock(&consumer_data->pid_mutex);
1536 if (consumer_data->pid == 0) {
712ea556 1537 ERR("Kconsumerd did not start");
3bd1e081 1538 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1539 goto error;
1540 }
3bd1e081 1541 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1542
8c0faa1d
DG		 1543 return 0;
1544
1545error:
1546 return ret;
1547}
1548
d9800920 1549/*
3bd1e081 1550 * Join consumer thread
d9800920 1551 */
3bd1e081 1552static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1553{
1554 void *status;
1555 int ret;
1556
3bd1e081
MD		 1557 if (consumer_data->pid != 0) {
1558 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1559 if (ret) {
3bd1e081 1560 ERR("Error killing consumer daemon");
cf3af59e
MD		 1561 return ret;
1562 }
3bd1e081 1563 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1564 } else {
1565 return 0;
1566 }
1567}
1568
8c0faa1d 1569/*
3bd1e081 1570 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1571 *
d063d709 1572 * Return pid if successful else -1.
8c0faa1d 1573 */
3bd1e081 1574static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1575{
1576 int ret;
1577 pid_t pid;
94c55f17 1578 const char *consumer_to_use;
53086306 1579 const char *verbosity;
94c55f17 1580 struct stat st;
8c0faa1d 1581
3bd1e081 1582 DBG("Spawning consumerd");
c49dc785 1583
8c0faa1d
DG		 1584 pid = fork();
1585 if (pid == 0) {
1586 /*
3bd1e081 1587 * Exec consumerd.
8c0faa1d 1588 */
daee5345 1589 if (opt_verbose_consumer) {
53086306
DG		 1590 verbosity = "--verbose";
1591 } else {
1592 verbosity = "--quiet";
1593 }
3bd1e081
MD		 1594 switch (consumer_data->type) {
1595 case LTTNG_CONSUMER_KERNEL:
94c55f17 1596 /*
f806231f
MD		 1597 * Find out which consumerd to execute. We will
1598 * first try the 64-bit path, then the
1599 * sessiond's installation directory, and
1600 * fallback on the 32-bit one,
94c55f17 1601 */
63a799e8
AM		 1602 DBG3("Looking for a kernel consumer at these locations:");
1603 DBG3(" 1) %s", consumerd64_bin);
1604 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1605 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1606 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1607 DBG3("Found location #1");
94c55f17 1608 consumer_to_use = consumerd64_bin;
94c55f17 1609 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1610 DBG3("Found location #2");
94c55f17 1611 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1612 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1613 DBG3("Found location #3");
eb1e0bd4 1614 consumer_to_use = consumerd32_bin;
94c55f17 1615 } else {
63a799e8 1616 DBG("Could not find any valid consumerd executable");
94c55f17
AM		 1617 break;
1618 }
1619 DBG("Using kernel consumer at: %s", consumer_to_use);
1620 execl(consumer_to_use,
1621 "lttng-consumerd", verbosity, "-k",
1622 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1623 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1624 NULL);
3bd1e081 1625 break;
7753dea8
MD		 1626 case LTTNG_CONSUMER64_UST:
1627 {
b1e0b6b6 1628 char *tmpnew = NULL;
8f4905da
MD		 1629
1630 if (consumerd64_libdir[0] != '\0') {
1631 char *tmp;
1632 size_t tmplen;
1633
1634 tmp = getenv("LD_LIBRARY_PATH");
1635 if (!tmp) {
1636 tmp = "";
1637 }
1638 tmplen = strlen("LD_LIBRARY_PATH=")
1639 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1640 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1641 if (!tmpnew) {
1642 ret = -ENOMEM;
1643 goto error;
1644 }
1645 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1646 strcat(tmpnew, consumerd64_libdir);
1647 if (tmp[0] != '\0') {
1648 strcat(tmpnew, ":");
1649 strcat(tmpnew, tmp);
1650 }
1651 ret = putenv(tmpnew);
1652 if (ret) {
1653 ret = -errno;
1654 goto error;
1655 }
1656 }
94c55f17 1657 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1658 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1659 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1660 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1661 NULL);
8f4905da
MD		 1662 if (consumerd64_libdir[0] != '\0') {
1663 free(tmpnew);
1664 }
1665 if (ret) {
1666 goto error;
1667 }
3bd1e081 1668 break;
7753dea8
MD		 1669 }
1670 case LTTNG_CONSUMER32_UST:
1671 {
937dde8e 1672 char *tmpnew = NULL;
8f4905da
MD		 1673
1674 if (consumerd32_libdir[0] != '\0') {
1675 char *tmp;
1676 size_t tmplen;
1677
1678 tmp = getenv("LD_LIBRARY_PATH");
1679 if (!tmp) {
1680 tmp = "";
1681 }
1682 tmplen = strlen("LD_LIBRARY_PATH=")
1683 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1684 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1685 if (!tmpnew) {
1686 ret = -ENOMEM;
1687 goto error;
1688 }
1689 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1690 strcat(tmpnew, consumerd32_libdir);
1691 if (tmp[0] != '\0') {
1692 strcat(tmpnew, ":");
1693 strcat(tmpnew, tmp);
1694 }
1695 ret = putenv(tmpnew);
1696 if (ret) {
1697 ret = -errno;
1698 goto error;
1699 }
1700 }
94c55f17 1701 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1702 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1703 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1704 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1705 NULL);
8f4905da
MD		 1706 if (consumerd32_libdir[0] != '\0') {
1707 free(tmpnew);
1708 }
1709 if (ret) {
1710 goto error;
1711 }
3bd1e081 1712 break;
7753dea8 1713 }
3bd1e081
MD		 1714 default:
1715 perror("unknown consumer type");
1716 exit(EXIT_FAILURE);
1717 }
8c0faa1d
DG		 1718 if (errno != 0) {
1719 perror("kernel start consumer exec");
1720 }
1721 exit(EXIT_FAILURE);
1722 } else if (pid > 0) {
1723 ret = pid;
8c0faa1d 1724 } else {
3bd1e081 1725 perror("start consumer fork");
8c0faa1d 1726 ret = -errno;
8c0faa1d 1727 }
8f4905da 1728error:
8c0faa1d
DG		 1729 return ret;
1730}
1731
693bd40b 1732/*
3bd1e081 1733 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1734 */
3bd1e081 1735static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1736{
1737 int ret;
1738
3bd1e081
MD		 1739 pthread_mutex_lock(&consumer_data->pid_mutex);
1740 if (consumer_data->pid != 0) {
1741 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1742 goto end;
1743 }
693bd40b 1744
3bd1e081 1745 ret = spawn_consumerd(consumer_data);
c49dc785 1746 if (ret < 0) {
3bd1e081
MD		 1747 ERR("Spawning consumerd failed");
1748 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1749 goto error;
693bd40b 1750 }
c49dc785 1751
3bd1e081
MD		 1752 /* Setting up the consumer_data pid */
1753 consumer_data->pid = ret;
48842b30 1754 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1755 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1756
3bd1e081
MD		 1757 DBG2("Spawning consumer control thread");
1758 ret = spawn_consumer_thread(consumer_data);
693bd40b 1759 if (ret < 0) {
3bd1e081 1760 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1761 goto error;
1762 }
1763
c49dc785 1764end:
693bd40b
DG		 1765 return 0;
1766
1767error:
1768 return ret;
1769}
1770
b73401da 1771/*
d063d709 1772 * modprobe_kernel_modules
b73401da
DG		 1773 */
1774static int modprobe_kernel_modules(void)
1775{
ab147185 1776 int ret = 0, i;
b73401da
DG		 1777 char modprobe[256];
1778
ab147185
MD		 1779 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1780 ret = snprintf(modprobe, sizeof(modprobe),
1781 "/sbin/modprobe %s%s",
24b487b8 1782 kernel_modules_list[i].required ? "" : "-q ",
ab147185 1783 kernel_modules_list[i].name);
b73401da
DG		 1784 if (ret < 0) {
1785 perror("snprintf modprobe");
1786 goto error;
1787 }
ab147185 1788 modprobe[sizeof(modprobe) - 1] = '\0';
b73401da 1789 ret = system(modprobe);
ab147185
MD		 1790 if (ret == -1) {
1791 ERR("Unable to launch modprobe for module %s",
1792 kernel_modules_list[i].name);
1793 } else if (kernel_modules_list[i].required
d9800920 1794 && WEXITSTATUS(ret) != 0) {
ab147185
MD		 1795 ERR("Unable to load module %s",
1796 kernel_modules_list[i].name);
1797 } else {
1798 DBG("Modprobe successfully %s",
1799 kernel_modules_list[i].name);
1800 }
1801 }
1802
1803error:
1804 return ret;
1805}
1806
b73401da 1807/*
d063d709 1808 * mount_debugfs
b73401da
DG		 1809 */
1810static int mount_debugfs(char *path)
1811{
1812 int ret;
1813 char *type = "debugfs";
1814
67f747d8 1815 ret = mkdir_recursive_run_as(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
b73401da 1816 if (ret < 0) {
7272acf5 1817 PERROR("Cannot create debugfs path");
b73401da
DG		 1818 goto error;
1819 }
1820
1821 ret = mount(type, path, type, 0, NULL);
1822 if (ret < 0) {
7272acf5 1823 PERROR("Cannot mount debugfs");
b73401da
DG		 1824 goto error;
1825 }
1826
1827 DBG("Mounted debugfs successfully at %s", path);
1828
1829error:
1830 return ret;
1831}
1832
8c0faa1d 1833/*
d063d709 1834 * Setup necessary data for kernel tracer action.
8c0faa1d 1835 */
f3ed775e 1836static void init_kernel_tracer(void)
8c0faa1d 1837{
b73401da
DG		 1838 int ret;
1839 char *proc_mounts = "/proc/mounts";
1840 char line[256];
684d34d2 1841 char *debugfs_path = NULL, *lttng_path = NULL;
b73401da
DG		 1842 FILE *fp;
1843
1844 /* Detect debugfs */
1845 fp = fopen(proc_mounts, "r");
1846 if (fp == NULL) {
1847 ERR("Unable to probe %s", proc_mounts);
1848 goto error;
1849 }
1850
1851 while (fgets(line, sizeof(line), fp) != NULL) {
1852 if (strstr(line, "debugfs") != NULL) {
1853 /* Remove first string */
1854 strtok(line, " ");
1855 /* Dup string here so we can reuse line later on */
1856 debugfs_path = strdup(strtok(NULL, " "));
1857 DBG("Got debugfs path : %s", debugfs_path);
1858 break;
1859 }
1860 }
1861
1862 fclose(fp);
1863
1864 /* Mount debugfs if needded */
1865 if (debugfs_path == NULL) {
1866 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1867 if (ret < 0) {
1868 perror("asprintf debugfs path");
1869 goto error;
1870 }
1871 ret = mount_debugfs(debugfs_path);
1872 if (ret < 0) {
7272acf5 1873 perror("Cannot mount debugfs");
b73401da
DG		 1874 goto error;
1875 }
1876 }
1877
1878 /* Modprobe lttng kernel modules */
1879 ret = modprobe_kernel_modules();
1880 if (ret < 0) {
1881 goto error;
1882 }
1883
1884 /* Setup lttng kernel path */
1885 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1886 if (ret < 0) {
1887 perror("asprintf lttng path");
1888 goto error;
1889 }
1890
1891 /* Open debugfs lttng */
1892 kernel_tracer_fd = open(lttng_path, O_RDWR);
f3ed775e 1893 if (kernel_tracer_fd < 0) {
b73401da
DG		 1894 DBG("Failed to open %s", lttng_path);
1895 goto error;
8c0faa1d
DG		 1896 }
1897
b73401da
DG		 1898 free(lttng_path);
1899 free(debugfs_path);
f3ed775e 1900 DBG("Kernel tracer fd %d", kernel_tracer_fd);
b73401da
DG		 1901 return;
1902
1903error:
1904 if (lttng_path) {
1905 free(lttng_path);
1906 }
1907 if (debugfs_path) {
1908 free(debugfs_path);
1909 }
1910 WARN("No kernel tracer available");
1911 kernel_tracer_fd = 0;
1912 return;
f3ed775e 1913}
33a2b854 1914
f3ed775e 1915/*
54d01ffb 1916 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1917 */
54d01ffb 1918static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1919{
f40799e8 1920 int ret = 0;
8c0faa1d 1921
3bd1e081 1922 if (session->consumer_fds_sent == 0) {
d9800920 1923 /*
54d01ffb
DG		 1924 * Assign default kernel consumer socket if no consumer assigned to the
1925 * kernel session. At this point, it's NOT suppose to be 0 but this is
1926 * an extra security check.
d9800920
DG		 1927 */
1928 if (session->consumer_fd == 0) {
3bd1e081 1929 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1930 }
1931
2bdd86d4 1932 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1933 if (ret < 0) {
f3ed775e
DG		 1934 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1935 goto error;
1936 }
1d4b027a 1937
3bd1e081 1938 session->consumer_fds_sent = 1;
f3ed775e 1939 }
1d4b027a
DG		 1940
1941error:
1942 return ret;
8c0faa1d
DG		 1943}
1944
0177d773
DG		 1945/*
1946 * Create an UST session and add it to the session ust list.
1947 */
44d3bd01
DG		 1948static int create_ust_session(struct ltt_session *session,
1949 struct lttng_domain *domain)
0177d773 1950{
13384287 1951 struct ltt_ust_session *lus = NULL;
6df2e2c9 1952 int ret;
44d3bd01
DG		 1953
1954 switch (domain->type) {
48842b30 1955 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1956 break;
1957 default:
13384287 1958 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1959 goto error;
1960 }
0177d773
DG		 1961
1962 DBG("Creating UST session");
1963
a991f516 1964 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1965 if (lus == NULL) {
44d3bd01 1966 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1967 goto error;
1968 }
1969
67f747d8 1970 ret = mkdir_recursive_run_as(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1971 session->uid, session->gid);
0177d773
DG		 1972 if (ret < 0) {
1973 if (ret != -EEXIST) {
1974 ERR("Trace directory creation error");
44d3bd01 1975 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1976 goto error;
1977 }
1978 }
1979
f6a9efaa
DG		 1980 /* The domain type dictate different actions on session creation */
1981 switch (domain->type) {
48842b30
DG		 1982 case LTTNG_DOMAIN_UST:
1983 /* No ustctl for the global UST domain */
1984 break;
1985 default:
36dc12cc 1986 ERR("Unknown UST domain on create session %d", domain->type);
0177d773
DG		 1987 goto error;
1988 }
6df2e2c9
MD		 1989 lus->uid = session->uid;
1990 lus->gid = session->gid;
f6a9efaa 1991 session->ust_session = lus;
44d3bd01
DG		 1992
1993 return LTTCOMM_OK;
0177d773
DG		 1994
1995error:
1996 free(lus);
1997 return ret;
1998}
1999
333f285e 2000/*
d063d709 2001 * Create a kernel tracer session then create the default channel.
333f285e 2002 */
f3ed775e 2003static int create_kernel_session(struct ltt_session *session)
333f285e 2004{
f3ed775e 2005 int ret;
f3ed775e
DG		 2006
2007 DBG("Creating kernel session");
2008
2009 ret = kernel_create_session(session, kernel_tracer_fd);
2010 if (ret < 0) {
2011 ret = LTTCOMM_KERN_SESS_FAIL;
2012 goto error;
333f285e
DG		 2013 }
2014
d9800920 2015 /* Set kernel consumer socket fd */
3bd1e081
MD		 2016 if (kconsumer_data.cmd_sock) {
2017 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 2018 }
2019
67f747d8 2020 ret = mkdir_recursive_run_as(session->kernel_session->trace_path,
6df2e2c9 2021 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 2022 if (ret < 0) {
996b65c8 2023 if (ret != -EEXIST) {
7a485870
DG		 2024 ERR("Trace directory creation error");
2025 goto error;
2026 }
2027 }
6df2e2c9
MD		 2028 session->kernel_session->uid = session->uid;
2029 session->kernel_session->gid = session->gid;
7a485870 2030
f3ed775e
DG		 2031error:
2032 return ret;
333f285e
DG		 2033}
2034
8e0af1b4
MD		 2035/*
2036 * Check if the UID or GID match the session. Root user has access to
2037 * all sessions.
2038 */
2039static int session_access_ok(struct ltt_session *session,
2040 uid_t uid, gid_t gid)
2041{
2042 if (uid != session->uid && gid != session->gid
2043 && uid != 0) {
2044 return 0;
2045 } else {
2046 return 1;
2047 }
2048}
2049
2050static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2051{
2052 unsigned int i = 0;
2053 struct ltt_session *session;
2054
2055 DBG("Counting number of available session for UID %d GID %d",
2056 uid, gid);
2057 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2058 /*
2059 * Only list the sessions the user can control.
2060 */
2061 if (!session_access_ok(session, uid, gid)) {
2062 continue;
2063 }
2064 i++;
2065 }
2066 return i;
2067}
2068
6c9cc2ab
DG		 2069/*
2070 * Using the session list, filled a lttng_session array to send back to the
2071 * client for session listing.
2072 *
2073 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 2074 * session_lock_list() and session_unlock_list().
6c9cc2ab 2075 */
8e0af1b4
MD		 2076static void list_lttng_sessions(struct lttng_session *sessions,
2077 uid_t uid, gid_t gid)
6c9cc2ab 2078{
8e0af1b4 2079 unsigned int i = 0;
6c9cc2ab
DG		 2080 struct ltt_session *session;
2081
8e0af1b4
MD		 2082 DBG("Getting all available session for UID %d GID %d",
2083 uid, gid);
6c9cc2ab
DG		 2084 /*
2085 * Iterate over session list and append data after the control struct in
2086 * the buffer.
2087 */
2088 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD		 2089 /*
2090 * Only list the sessions the user can control.
2091 */
2092 if (!session_access_ok(session, uid, gid)) {
2093 continue;
2094 }
6c9cc2ab 2095 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 2096 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 2097 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 2098 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 2099 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 2100 i++;
2101 }
2102}
2103
9f19cc17
DG		 2104/*
2105 * Fill lttng_channel array of all channels.
2106 */
b551a063 2107static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 2108 struct lttng_channel *channels)
2109{
2110 int i = 0;
2111 struct ltt_kernel_channel *kchan;
2112
2113 DBG("Listing channels for session %s", session->name);
2114
b551a063
DG		 2115 switch (domain) {
2116 case LTTNG_DOMAIN_KERNEL:
2117 /* Kernel channels */
2118 if (session->kernel_session != NULL) {
2119 cds_list_for_each_entry(kchan,
2120 &session->kernel_session->channel_list.head, list) {
2121 /* Copy lttng_channel struct to array */
2122 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2123 channels[i].enabled = kchan->enabled;
2124 i++;
2125 }
2126 }
2127 break;
2128 case LTTNG_DOMAIN_UST:
2129 {
bec39940 2130 struct lttng_ht_iter iter;
b551a063
DG		 2131 struct ltt_ust_channel *uchan;
2132
bec39940
DG		 2133 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
2134 &iter.iter, uchan, node.node) {
b551a063
DG		 2135 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2136 channels[i].attr.overwrite = uchan->attr.overwrite;
2137 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2138 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2139 channels[i].attr.switch_timer_interval =
2140 uchan->attr.switch_timer_interval;
2141 channels[i].attr.read_timer_interval =
2142 uchan->attr.read_timer_interval;
aea829b3 2143 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 2144 switch (uchan->attr.output) {
2145 case LTTNG_UST_MMAP:
2146 default:
2147 channels[i].attr.output = LTTNG_EVENT_MMAP;
2148 break;
2149 }
9f19cc17
DG		 2150 i++;
2151 }
b551a063
DG		 2152 break;
2153 }
2154 default:
2155 break;
9f19cc17 2156 }
b551a063 2157}
9f19cc17 2158
b551a063
DG		 2159/*
2160 * Create a list of ust global domain events.
2161 */
2162static int list_lttng_ust_global_events(char *channel_name,
2163 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2164{
2165 int i = 0, ret = 0;
2166 unsigned int nb_event = 0;
bec39940
DG		 2167 struct lttng_ht_iter iter;
2168 struct lttng_ht_node_str *node;
b551a063
DG		 2169 struct ltt_ust_channel *uchan;
2170 struct ltt_ust_event *uevent;
2171 struct lttng_event *tmp;
2172
2173 DBG("Listing UST global events for channel %s", channel_name);
2174
2175 rcu_read_lock();
2176
bec39940
DG		 2177 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2178 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG		 2179 if (node == NULL) {
2180 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2181 goto error;
b551a063
DG		 2182 }
2183
bec39940 2184 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2185
bec39940 2186 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2187
b551a063
DG		 2188 if (nb_event == 0) {
2189 ret = nb_event;
2190 goto error;
2191 }
2192
2193 DBG3("Listing UST global %d events", nb_event);
2194
2195 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2196 if (tmp == NULL) {
2197 ret = -LTTCOMM_FATAL;
2198 goto error;
2199 }
2200
bec39940 2201 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG		 2202 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2203 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2204 tmp[i].enabled = uevent->enabled;
2205 switch (uevent->attr.instrumentation) {
2206 case LTTNG_UST_TRACEPOINT:
2207 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2208 break;
2209 case LTTNG_UST_PROBE:
2210 tmp[i].type = LTTNG_EVENT_PROBE;
2211 break;
2212 case LTTNG_UST_FUNCTION:
2213 tmp[i].type = LTTNG_EVENT_FUNCTION;
2214 break;
ac3bd9c0 2215 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
e4baff1e 2216 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
ac3bd9c0 2217 break;
9f19cc17 2218 }
d7b75b30 2219 i++;
9f19cc17
DG		 2220 }
2221
b551a063
DG		 2222 ret = nb_event;
2223 *events = tmp;
2224
2225error:
2226 rcu_read_unlock();
2227 return ret;
9f19cc17
DG		 2228}
2229
2230/*
b551a063 2231 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2232 */
b551a063
DG		 2233static int list_lttng_kernel_events(char *channel_name,
2234 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2235{
b551a063
DG		 2236 int i = 0, ret;
2237 unsigned int nb_event;
9f19cc17 2238 struct ltt_kernel_event *event;
b551a063
DG		 2239 struct ltt_kernel_channel *kchan;
2240
2241 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2242 if (kchan == NULL) {
2243 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2244 goto error;
2245 }
2246
2247 nb_event = kchan->event_count;
9f19cc17
DG		 2248
2249 DBG("Listing events for channel %s", kchan->channel->name);
2250
b551a063
DG		 2251 if (nb_event == 0) {
2252 ret = nb_event;
2253 goto error;
2254 }
2255
2256 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2257 if (*events == NULL) {
2258 ret = LTTCOMM_FATAL;
2259 goto error;
2260 }
2261
9f19cc17
DG		 2262 /* Kernel channels */
2263 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2264 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2265 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2266 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2267 switch (event->event->instrumentation) {
2268 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2269 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2270 break;
2271 case LTTNG_KERNEL_KPROBE:
2272 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2273 (*events)[i].type = LTTNG_EVENT_PROBE;
2274 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2275 sizeof(struct lttng_kernel_kprobe));
2276 break;
2277 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2278 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2279 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2280 sizeof(struct lttng_kernel_function));
2281 break;
0133c199 2282 case LTTNG_KERNEL_NOOP:
b551a063 2283 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2284 break;
a54bd42d 2285 case LTTNG_KERNEL_SYSCALL:
b551a063 2286 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2287 break;
7a3d1328
MD		 2288 case LTTNG_KERNEL_ALL:
2289 assert(0);
2290 break;
9f19cc17
DG		 2291 }
2292 i++;
2293 }
b551a063
DG		 2294
2295 return nb_event;
2296
2297error:
2298 return ret;
9f19cc17
DG		 2299}
2300
fac6795d 2301/*
54d01ffb 2302 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2303 */
54d01ffb
DG		 2304static int cmd_disable_channel(struct ltt_session *session,
2305 int domain, char *channel_name)
fac6795d 2306{
54d01ffb 2307 int ret;
78f0bacd
DG		 2308 struct ltt_ust_session *usess;
2309
2310 usess = session->ust_session;
379473d2 2311
54d01ffb 2312 switch (domain) {
78f0bacd
DG		 2313 case LTTNG_DOMAIN_KERNEL:
2314 {
2315 ret = channel_kernel_disable(session->kernel_session,
2316 channel_name);
2317 if (ret != LTTCOMM_OK) {
2318 goto error;
2319 }
54d01ffb 2320
78f0bacd
DG		 2321 kernel_wait_quiescent(kernel_tracer_fd);
2322 break;
2323 }
2324 case LTTNG_DOMAIN_UST:
2325 {
2326 struct ltt_ust_channel *uchan;
bec39940 2327 struct lttng_ht *chan_ht;
78f0bacd 2328
7885e399
DG		 2329 chan_ht = usess->domain_global.channels;
2330
2331 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2332 if (uchan == NULL) {
2333 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2334 goto error;
78f0bacd
DG		 2335 }
2336
7885e399
DG		 2337 ret = channel_ust_disable(usess, domain, uchan);
2338 if (ret != LTTCOMM_OK) {
54d01ffb 2339 goto error;
78f0bacd 2340 }
78f0bacd
DG		 2341 break;
2342 }
2343 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2344 case LTTNG_DOMAIN_UST_EXEC_NAME:
2345 case LTTNG_DOMAIN_UST_PID:
2346 ret = LTTCOMM_NOT_IMPLEMENTED;
2347 goto error;
2348 default:
2349 ret = LTTCOMM_UNKNOWN_DOMAIN;
2350 goto error;
20fe2104
DG		 2351 }
2352
54d01ffb 2353 ret = LTTCOMM_OK;
d65106b1 2354
54d01ffb
DG		 2355error:
2356 return ret;
2357}
2358
2359/*
2360 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2361 */
44d3bd01 2362static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2363 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2364{
2365 int ret;
f6a9efaa 2366 struct ltt_ust_session *usess = session->ust_session;
bec39940 2367 struct lttng_ht *chan_ht;
f6a9efaa 2368
5d56b5aa 2369 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2370
aea829b3 2371 switch (domain) {
44d3bd01
DG		 2372 case LTTNG_DOMAIN_KERNEL:
2373 {
2374 struct ltt_kernel_channel *kchan;
54d01ffb 2375
44d3bd01
DG		 2376 kchan = trace_kernel_get_channel_by_name(attr->name,
2377 session->kernel_session);
2378 if (kchan == NULL) {
2379 ret = channel_kernel_create(session->kernel_session,
2380 attr, kernel_poll_pipe[1]);
2381 } else {
2382 ret = channel_kernel_enable(session->kernel_session, kchan);
2383 }
2384
2385 if (ret != LTTCOMM_OK) {
2386 goto error;
2387 }
2388
2389 kernel_wait_quiescent(kernel_tracer_fd);
2390 break;
2391 }
f6a9efaa
DG		 2392 case LTTNG_DOMAIN_UST:
2393 {
2394 struct ltt_ust_channel *uchan;
2395
7885e399 2396 chan_ht = usess->domain_global.channels;
f6a9efaa 2397
7885e399 2398 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2399 if (uchan == NULL) {
7885e399 2400 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2401 } else {
7885e399 2402 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2403 }
f6a9efaa
DG		 2404 break;
2405 }
78f0bacd
DG		 2406 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2407 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2408 case LTTNG_DOMAIN_UST_PID:
f6a9efaa
DG		 2409 ret = LTTCOMM_NOT_IMPLEMENTED;
2410 goto error;
44d3bd01
DG		 2411 default:
2412 ret = LTTCOMM_UNKNOWN_DOMAIN;
2413 goto error;
54d01ffb
DG		 2414 }
2415
54d01ffb
DG		 2416error:
2417 return ret;
2418}
2419
2420/*
2421 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2422 */
2423static int cmd_disable_event(struct ltt_session *session, int domain,
2424 char *channel_name, char *event_name)
2425{
2426 int ret;
54d01ffb
DG		 2427
2428 switch (domain) {
2429 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2430 {
2431 struct ltt_kernel_channel *kchan;
b0a40d28 2432 struct ltt_kernel_session *ksess;
2bdd86d4 2433
b0a40d28
DG		 2434 ksess = session->kernel_session;
2435
2436 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2437 if (kchan == NULL) {
2438 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2439 goto error;
d65106b1
DG		 2440 }
2441
b0a40d28 2442 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2443 if (ret != LTTCOMM_OK) {
2444 goto error;
2445 }
2446
2447 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2448 break;
2bdd86d4
MD		 2449 }
2450 case LTTNG_DOMAIN_UST:
b0a40d28 2451 {
b0a40d28 2452 struct ltt_ust_channel *uchan;
7f79d3a1 2453 struct ltt_ust_session *usess;
b0a40d28
DG		 2454
2455 usess = session->ust_session;
2456
2457 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2458 channel_name);
2459 if (uchan == NULL) {
2460 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2461 goto error;
2462 }
2463
7f79d3a1
DG		 2464 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2465 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2466 goto error;
2467 }
2468
7f79d3a1 2469 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2470 channel_name);
b0a40d28
DG		 2471 break;
2472 }
2bdd86d4
MD		 2473 case LTTNG_DOMAIN_UST_EXEC_NAME:
2474 case LTTNG_DOMAIN_UST_PID:
2475 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2476 default:
54d01ffb
DG		 2477 ret = LTTCOMM_NOT_IMPLEMENTED;
2478 goto error;
d65106b1 2479 }
26cc6b4e 2480
54d01ffb
DG		 2481 ret = LTTCOMM_OK;
2482
2483error:
2484 return ret;
2485}
2486
2487/*
2488 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2489 */
2490static int cmd_disable_event_all(struct ltt_session *session, int domain,
2491 char *channel_name)
2492{
2493 int ret;
54d01ffb
DG		 2494
2495 switch (domain) {
2496 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2497 {
2498 struct ltt_kernel_session *ksess;
2499 struct ltt_kernel_channel *kchan;
2500
2501 ksess = session->kernel_session;
2502
2503 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2504 if (kchan == NULL) {
2505 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2506 goto error;
26cc6b4e
DG		 2507 }
2508
9730260e 2509 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2510 if (ret != LTTCOMM_OK) {
0b97ec54 2511 goto error;
26cc6b4e
DG		 2512 }
2513
54d01ffb 2514 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2515 break;
9730260e
DG		 2516 }
2517 case LTTNG_DOMAIN_UST:
2518 {
2519 struct ltt_ust_session *usess;
2520 struct ltt_ust_channel *uchan;
2521
2522 usess = session->ust_session;
2523
2524 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2525 channel_name);
2526 if (uchan == NULL) {
2527 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2528 goto error;
2529 }
2530
7f79d3a1
DG		 2531 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2532 if (ret != 0) {
9730260e
DG		 2533 goto error;
2534 }
2535
7f79d3a1 2536 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2537
2538 break;
2539 }
2540 case LTTNG_DOMAIN_UST_EXEC_NAME:
2541 case LTTNG_DOMAIN_UST_PID:
2542 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2543 default:
54d01ffb
DG		 2544 ret = LTTCOMM_NOT_IMPLEMENTED;
2545 goto error;
26cc6b4e 2546 }
e953ef25 2547
54d01ffb 2548 ret = LTTCOMM_OK;
e953ef25 2549
54d01ffb
DG		 2550error:
2551 return ret;
2552}
f5177a38 2553
54d01ffb
DG		 2554/*
2555 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2556 */
2557static int cmd_add_context(struct ltt_session *session, int domain,
2558 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2559{
2560 int ret;
f5177a38 2561
54d01ffb
DG		 2562 switch (domain) {
2563 case LTTNG_DOMAIN_KERNEL:
2564 /* Add kernel context to kernel tracer */
2565 ret = context_kernel_add(session->kernel_session, ctx,
2566 event_name, channel_name);
2567 if (ret != LTTCOMM_OK) {
f5177a38 2568 goto error;
e953ef25 2569 }
2bdd86d4
MD		 2570 break;
2571 case LTTNG_DOMAIN_UST:
2572 {
55cc08a6 2573 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2574
55cc08a6
DG		 2575 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2576 if (ret != LTTCOMM_OK) {
2577 goto error;
2bdd86d4 2578 }
e953ef25 2579 break;
2bdd86d4 2580 }
55cc08a6
DG		 2581 case LTTNG_DOMAIN_UST_EXEC_NAME:
2582 case LTTNG_DOMAIN_UST_PID:
2583 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2584 default:
54d01ffb
DG		 2585 ret = LTTCOMM_NOT_IMPLEMENTED;
2586 goto error;
e953ef25 2587 }
950131af 2588
54d01ffb 2589 ret = LTTCOMM_OK;
950131af 2590
54d01ffb
DG		 2591error:
2592 return ret;
2593}
2594
2595/*
2596 * Command LTTNG_ENABLE_EVENT processed by the client thread.
13dce3b7
MD		 2597 *
2598 * TODO: currently, both events and loglevels are kept within the same
2599 * namespace for UST global registry/app registery, so if an event
2600 * happen to have the same name as the loglevel (very unlikely though),
2601 * and an attempt is made to enable/disable both in the same session,
2602 * the first to be created will be the only one allowed to exist.
54d01ffb
DG		 2603 */
2604static int cmd_enable_event(struct ltt_session *session, int domain,
2605 char *channel_name, struct lttng_event *event)
2606{
2607 int ret;
f6cd6b0f 2608 struct lttng_channel *attr;
48842b30 2609 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2610
2611 switch (domain) {
2612 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2613 {
2614 struct ltt_kernel_channel *kchan;
2615
54d01ffb
DG		 2616 kchan = trace_kernel_get_channel_by_name(channel_name,
2617 session->kernel_session);
2618 if (kchan == NULL) {
f6cd6b0f
DG		 2619 attr = channel_new_default_attr(domain);
2620 if (attr == NULL) {
2621 ret = LTTCOMM_FATAL;
2622 goto error;
2623 }
2624 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2625
54d01ffb 2626 /* This call will notify the kernel thread */
44d3bd01 2627 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2628 attr, kernel_poll_pipe[1]);
54d01ffb 2629 if (ret != LTTCOMM_OK) {
ff4d74e6 2630 free(attr);
f5177a38
DG		 2631 goto error;
2632 }
ff4d74e6 2633 free(attr);
54d01ffb 2634 }
950131af 2635
54d01ffb
DG		 2636 /* Get the newly created kernel channel pointer */
2637 kchan = trace_kernel_get_channel_by_name(channel_name,
2638 session->kernel_session);
2639 if (kchan == NULL) {
2640 /* This sould not happen... */
2641 ret = LTTCOMM_FATAL;
2642 goto error;
2643 }
f5177a38 2644
48842b30
DG		 2645 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2646 event);
54d01ffb 2647 if (ret != LTTCOMM_OK) {
f5177a38 2648 goto error;
950131af
DG		 2649 }
2650
54d01ffb 2651 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2652 break;
2bdd86d4
MD		 2653 }
2654 case LTTNG_DOMAIN_UST:
2655 {
aea829b3 2656 struct lttng_channel *attr;
48842b30 2657 struct ltt_ust_channel *uchan;
2bdd86d4 2658
edb67388 2659 /* Get channel from global UST domain */
48842b30
DG		 2660 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2661 channel_name);
2662 if (uchan == NULL) {
aea829b3
DG		 2663 /* Create default channel */
2664 attr = channel_new_default_attr(domain);
2665 if (attr == NULL) {
2666 ret = LTTCOMM_FATAL;
2667 goto error;
2668 }
596219f7 2669 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2670 attr->name[NAME_MAX - 1] = '\0';
2bdd86d4 2671
7885e399 2672 ret = channel_ust_create(usess, domain, attr);
edb67388 2673 if (ret != LTTCOMM_OK) {
ff4d74e6 2674 free(attr);
aea829b3
DG		 2675 goto error;
2676 }
aea829b3
DG		 2677 free(attr);
2678
2679 /* Get the newly created channel reference back */
2680 uchan = trace_ust_find_channel_by_name(
2681 usess->domain_global.channels, channel_name);
2682 if (uchan == NULL) {
2683 /* Something is really wrong */
2bdd86d4
MD		 2684 ret = LTTCOMM_FATAL;
2685 goto error;
2686 }
48842b30 2687 }
2bdd86d4 2688
edb67388 2689 /* At this point, the session and channel exist on the tracer */
edb67388
DG		 2690 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2691 if (ret != LTTCOMM_OK) {
48842b30 2692 goto error;
2bdd86d4
MD		 2693 }
2694 break;
2695 }
2696 case LTTNG_DOMAIN_UST_EXEC_NAME:
2697 case LTTNG_DOMAIN_UST_PID:
2698 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2699 default:
54d01ffb
DG		 2700 ret = LTTCOMM_NOT_IMPLEMENTED;
2701 goto error;
950131af 2702 }
d36b8583 2703
54d01ffb 2704 ret = LTTCOMM_OK;
d36b8583 2705
54d01ffb
DG		 2706error:
2707 return ret;
2708}
7d29a247 2709
54d01ffb
DG		 2710/*
2711 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2712 */
2713static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2714 char *channel_name, int event_type)
54d01ffb
DG		 2715{
2716 int ret;
2717 struct ltt_kernel_channel *kchan;
7d29a247 2718
54d01ffb
DG		 2719 switch (domain) {
2720 case LTTNG_DOMAIN_KERNEL:
2721 kchan = trace_kernel_get_channel_by_name(channel_name,
2722 session->kernel_session);
2723 if (kchan == NULL) {
2724 /* This call will notify the kernel thread */
44d3bd01
DG		 2725 ret = channel_kernel_create(session->kernel_session, NULL,
2726 kernel_poll_pipe[1]);
54d01ffb
DG		 2727 if (ret != LTTCOMM_OK) {
2728 goto error;
d36b8583 2729 }
0d0c377a 2730
8f69e5eb
DG		 2731 /* Get the newly created kernel channel pointer */
2732 kchan = trace_kernel_get_channel_by_name(channel_name,
2733 session->kernel_session);
2734 if (kchan == NULL) {
2735 /* This sould not happen... */
2736 ret = LTTCOMM_FATAL;
2737 goto error;
2738 }
2739
54d01ffb 2740 }
0fdd1e2c 2741
7a3d1328 2742 switch (event_type) {
76d45b40 2743 case LTTNG_EVENT_SYSCALL:
7a3d1328 2744 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2745 kchan, kernel_tracer_fd);
7a3d1328 2746 break;
76d45b40 2747 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2748 /*
7a3d1328
MD		 2749 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2750 * events already registered to the channel.
8c9ae521 2751 */
7a3d1328
MD		 2752 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2753 kchan, kernel_tracer_fd);
2754 break;
76d45b40 2755 case LTTNG_EVENT_ALL:
7a3d1328 2756 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2757 ret = event_kernel_enable_all(session->kernel_session,
2758 kchan, kernel_tracer_fd);
7a3d1328
MD		 2759 break;
2760 default:
2761 ret = LTTCOMM_KERN_ENABLE_FAIL;
2762 goto error;
8c9ae521 2763 }
8f69e5eb
DG		 2764
2765 /* Manage return value */
54d01ffb 2766 if (ret != LTTCOMM_OK) {
0d0c377a 2767 goto error;
d36b8583
DG		 2768 }
2769
54d01ffb 2770 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2771 break;
76d45b40
DG		 2772 case LTTNG_DOMAIN_UST:
2773 {
2774 struct lttng_channel *attr;
2775 struct ltt_ust_channel *uchan;
2776 struct ltt_ust_session *usess = session->ust_session;
2777
2778 /* Get channel from global UST domain */
2779 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2780 channel_name);
2781 if (uchan == NULL) {
2782 /* Create default channel */
2783 attr = channel_new_default_attr(domain);
2784 if (attr == NULL) {
2785 ret = LTTCOMM_FATAL;
2786 goto error;
2787 }
2788 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2789 attr->name[NAME_MAX - 1] = '\0';
2790
2791 /* Use the internal command enable channel */
7885e399 2792 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2793 if (ret != LTTCOMM_OK) {
2794 free(attr);
2795 goto error;
2796 }
2797 free(attr);
2798
2799 /* Get the newly created channel reference back */
2800 uchan = trace_ust_find_channel_by_name(
2801 usess->domain_global.channels, channel_name);
2802 if (uchan == NULL) {
2803 /* Something is really wrong */
2804 ret = LTTCOMM_FATAL;
2805 goto error;
2806 }
2807 }
2808
2809 /* At this point, the session and channel exist on the tracer */
2810
2811 switch (event_type) {
2812 case LTTNG_EVENT_ALL:
2813 case LTTNG_EVENT_TRACEPOINT:
2814 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2815 if (ret != LTTCOMM_OK) {
2816 goto error;
2817 }
2818 break;
2819 default:
2820 ret = LTTCOMM_UST_ENABLE_FAIL;
2821 goto error;
2822 }
2823
2824 /* Manage return value */
2825 if (ret != LTTCOMM_OK) {
2826 goto error;
2827 }
2828
2829 break;
2830 }
2831 case LTTNG_DOMAIN_UST_EXEC_NAME:
2832 case LTTNG_DOMAIN_UST_PID:
2833 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
54d01ffb 2834 default:
54d01ffb
DG		 2835 ret = LTTCOMM_NOT_IMPLEMENTED;
2836 goto error;
d36b8583 2837 }
f3ed775e 2838
54d01ffb
DG		 2839 ret = LTTCOMM_OK;
2840
2841error:
2842 return ret;
2843}
2844
2845/*
2846 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2847 */
2848static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2849{
2850 int ret;
2851 ssize_t nb_events = 0;
2852
2853 switch (domain) {
2854 case LTTNG_DOMAIN_KERNEL:
2855 nb_events = kernel_list_events(kernel_tracer_fd, events);
2856 if (nb_events < 0) {
2857 ret = LTTCOMM_KERN_LIST_FAIL;
2858 goto error;
894be886 2859 }
54d01ffb 2860 break;
b551a063
DG		 2861 case LTTNG_DOMAIN_UST:
2862 nb_events = ust_app_list_events(events);
2863 if (nb_events < 0) {
2864 ret = LTTCOMM_UST_LIST_FAIL;
2865 goto error;
2866 }
2867 break;
54d01ffb 2868 default:
54d01ffb
DG		 2869 ret = LTTCOMM_NOT_IMPLEMENTED;
2870 goto error;
2871 }
894be886 2872
54d01ffb 2873 return nb_events;
7d29a247 2874
54d01ffb
DG		 2875error:
2876 /* Return negative value to differentiate return code */
2877 return -ret;
2878}
b389abbe 2879
54d01ffb
DG		 2880/*
2881 * Command LTTNG_START_TRACE processed by the client thread.
2882 */
2883static int cmd_start_trace(struct ltt_session *session)
2884{
2885 int ret;
54d01ffb 2886 struct ltt_kernel_session *ksession;
b9d9b220 2887 struct ltt_ust_session *usess;
b389abbe 2888
54d01ffb
DG		 2889 /* Short cut */
2890 ksession = session->kernel_session;
b9d9b220 2891 usess = session->ust_session;
5eb91c98 2892
b9ef1c83
DG		 2893 if (session->enabled) {
2894 ret = LTTCOMM_UST_START_FAIL;
2895 goto error;
2896 }
2897
464dd62d 2898 session->enabled = 1;
5eb91c98 2899
54d01ffb
DG		 2900 /* Kernel tracing */
2901 if (ksession != NULL) {
2bdd86d4
MD		 2902 struct ltt_kernel_channel *kchan;
2903
54d01ffb
DG		 2904 /* Open kernel metadata */
2905 if (ksession->metadata == NULL) {
2906 ret = kernel_open_metadata(ksession, ksession->trace_path);
2907 if (ret < 0) {
2908 ret = LTTCOMM_KERN_META_FAIL;
2909 goto error;
b389abbe 2910 }
54d01ffb 2911 }
7d29a247 2912
54d01ffb
DG		 2913 /* Open kernel metadata stream */
2914 if (ksession->metadata_stream_fd == 0) {
2915 ret = kernel_open_metadata_stream(ksession);
2916 if (ret < 0) {
2917 ERR("Kernel create metadata stream failed");
2918 ret = LTTCOMM_KERN_STREAM_FAIL;
2919 goto error;
2920 }
2921 }
2922
2923 /* For each channel */
2924 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2925 if (kchan->stream_count == 0) {
2926 ret = kernel_open_channel_stream(kchan);
2927 if (ret < 0) {
2928 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2929 goto error;
2930 }
54d01ffb
DG		 2931 /* Update the stream global counter */
2932 ksession->stream_count_global += ret;
7d29a247 2933 }
54d01ffb
DG		 2934 }
2935
2936 /* Setup kernel consumer socket and send fds to it */
2937 ret = init_kernel_tracing(ksession);
2938 if (ret < 0) {
2939 ret = LTTCOMM_KERN_START_FAIL;
2940 goto error;
2941 }
2942
2943 /* This start the kernel tracing */
2944 ret = kernel_start_session(ksession);
2945 if (ret < 0) {
2946 ret = LTTCOMM_KERN_START_FAIL;
2947 goto error;
2948 }
2949
2950 /* Quiescent wait after starting trace */
2951 kernel_wait_quiescent(kernel_tracer_fd);
2952 }
2953
36dc12cc 2954 /* Flag session that trace should start automatically */
b9d9b220
DG		 2955 if (usess) {
2956 usess->start_trace = 1;
36dc12cc 2957
b9d9b220
DG		 2958 ret = ust_app_start_trace_all(usess);
2959 if (ret < 0) {
2960 ret = LTTCOMM_UST_START_FAIL;
2961 goto error;
2962 }
2bdd86d4 2963 }
54d01ffb
DG		 2964
2965 ret = LTTCOMM_OK;
2966
2967error:
2968 return ret;
2969}
2970
2971/*
2972 * Command LTTNG_STOP_TRACE processed by the client thread.
2973 */
2974static int cmd_stop_trace(struct ltt_session *session)
2975{
2976 int ret;
2977 struct ltt_kernel_channel *kchan;
2978 struct ltt_kernel_session *ksession;
8be98f9a 2979 struct ltt_ust_session *usess;
54d01ffb
DG		 2980
2981 /* Short cut */
2982 ksession = session->kernel_session;
8be98f9a 2983 usess = session->ust_session;
54d01ffb 2984
b9ef1c83 2985 if (!session->enabled) {
190df5ac 2986 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG		 2987 goto error;
2988 }
2989
464dd62d 2990 session->enabled = 0;
54d01ffb
DG		 2991
2992 /* Kernel tracer */
2993 if (ksession != NULL) {
2994 DBG("Stop kernel tracing");
2995
2996 /* Flush all buffers before stopping */
2997 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2998 if (ret < 0) {
2999 ERR("Kernel metadata flush failed");
3000 }
f34daff7 3001
54d01ffb
DG		 3002 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
3003 ret = kernel_flush_buffer(kchan);
0d0c377a 3004 if (ret < 0) {
54d01ffb 3005 ERR("Kernel flush buffer error");
7d29a247 3006 }
54d01ffb 3007 }
19e70852 3008
54d01ffb
DG		 3009 ret = kernel_stop_session(ksession);
3010 if (ret < 0) {
3011 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 3012 goto error;
f3ed775e 3013 }
54d01ffb
DG		 3014
3015 kernel_wait_quiescent(kernel_tracer_fd);
894be886 3016 }
54d01ffb 3017
8be98f9a
MD		 3018 if (usess) {
3019 usess->start_trace = 0;
2bdd86d4 3020
8be98f9a 3021 ret = ust_app_stop_trace_all(usess);
2bdd86d4 3022 if (ret < 0) {
190df5ac 3023 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD		 3024 goto error;
3025 }
2bdd86d4 3026 }
54d01ffb
DG		 3027
3028 ret = LTTCOMM_OK;
3029
3030error:
3031 return ret;
3032}
3033
3034/*
3035 * Command LTTNG_CREATE_SESSION processed by the client thread.
3036 */
6df2e2c9 3037static int cmd_create_session(char *name, char *path, struct ucred *creds)
54d01ffb
DG		 3038{
3039 int ret;
3040
6df2e2c9 3041 ret = session_create(name, path, creds->uid, creds->gid);
54d01ffb
DG		 3042 if (ret != LTTCOMM_OK) {
3043 goto error;
3044 }
3045
3046 ret = LTTCOMM_OK;
3047
3048error:
3049 return ret;
3050}
3051
3052/*
3053 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3054 */
3055static int cmd_destroy_session(struct ltt_session *session, char *name)
3056{
3057 int ret;
3058
3059 /* Clean kernel session teardown */
3060 teardown_kernel_session(session);
84cd17c6
MD		 3061 /* UST session teardown */
3062 teardown_ust_session(session);
54d01ffb
DG		 3063
3064 /*
3065 * Must notify the kernel thread here to update it's poll setin order
3066 * to remove the channel(s)' fd just destroyed.
3067 */
3068 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3069 if (ret < 0) {
3070 perror("write kernel poll pipe");
3071 }
3072
271933a4 3073 ret = session_destroy(session);
54d01ffb
DG		 3074
3075 return ret;
3076}
3077
3078/*
3079 * Command LTTNG_CALIBRATE processed by the client thread.
3080 */
3081static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3082{
3083 int ret;
3084
3085 switch (domain) {
3086 case LTTNG_DOMAIN_KERNEL:
33a2b854 3087 {
54d01ffb 3088 struct lttng_kernel_calibrate kcalibrate;
33a2b854 3089
54d01ffb
DG		 3090 kcalibrate.type = calibrate->type;
3091 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 3092 if (ret < 0) {
54d01ffb
DG		 3093 ret = LTTCOMM_KERN_ENABLE_FAIL;
3094 goto error;
33a2b854 3095 }
54d01ffb
DG		 3096 break;
3097 }
3098 default:
3099 /* TODO: Userspace tracing */
3100 ret = LTTCOMM_NOT_IMPLEMENTED;
3101 goto error;
3102 }
33a2b854 3103
54d01ffb 3104 ret = LTTCOMM_OK;
33a2b854 3105
54d01ffb
DG		 3106error:
3107 return ret;
3108}
7d29a247 3109
54d01ffb
DG		 3110/*
3111 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3112 */
3113static int cmd_register_consumer(struct ltt_session *session, int domain,
3114 char *sock_path)
3115{
3116 int ret, sock;
b389abbe 3117
54d01ffb
DG		 3118 switch (domain) {
3119 case LTTNG_DOMAIN_KERNEL:
3120 /* Can't register a consumer if there is already one */
48c4f28c 3121 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 3122 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3123 goto error;
3124 }
3125
3126 sock = lttcomm_connect_unix_sock(sock_path);
3127 if (sock < 0) {
3128 ret = LTTCOMM_CONNECT_FAIL;
3129 goto error;
3130 }
3131
3132 session->kernel_session->consumer_fd = sock;
3133 break;
3134 default:
3135 /* TODO: Userspace tracing */
3136 ret = LTTCOMM_NOT_IMPLEMENTED;
3137 goto error;
3138 }
3139
3140 ret = LTTCOMM_OK;
3141
3142error:
3143 return ret;
3144}
3145
3146/*
3147 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3148 */
3149static ssize_t cmd_list_domains(struct ltt_session *session,
3150 struct lttng_domain **domains)
3151{
b551a063 3152 int ret, index = 0;
54d01ffb
DG		 3153 ssize_t nb_dom = 0;
3154
3155 if (session->kernel_session != NULL) {
b551a063 3156 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3157 nb_dom++;
3158 }
3159
b551a063
DG		 3160 if (session->ust_session != NULL) {
3161 DBG3("Listing domains found UST global domain");
3162 nb_dom++;
3163 }
54d01ffb 3164
b551a063 3165 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3166 if (*domains == NULL) {
3167 ret = -LTTCOMM_FATAL;
3168 goto error;
3169 }
3170
b551a063
DG		 3171 if (session->kernel_session != NULL) {
3172 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3173 index++;
3174 }
3175
3176 if (session->ust_session != NULL) {
3177 (*domains)[index].type = LTTNG_DOMAIN_UST;
3178 index++;
3179 }
54d01ffb 3180
54d01ffb
DG		 3181 return nb_dom;
3182
3183error:
3184 return ret;
3185}
3186
3187/*
3188 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3189 */
b551a063 3190static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3191 struct lttng_channel **channels)
3192{
3193 int ret;
3194 ssize_t nb_chan = 0;
3195
b551a063
DG		 3196 switch (domain) {
3197 case LTTNG_DOMAIN_KERNEL:
3198 if (session->kernel_session != NULL) {
3199 nb_chan = session->kernel_session->channel_count;
3200 }
0df502fd 3201 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3202 break;
3203 case LTTNG_DOMAIN_UST:
3204 if (session->ust_session != NULL) {
bec39940 3205 nb_chan = lttng_ht_get_count(
b551a063
DG		 3206 session->ust_session->domain_global.channels);
3207 }
0df502fd 3208 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3209 break;
3210 default:
3211 *channels = NULL;
3212 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3213 goto error;
3214 }
3215
b551a063
DG		 3216 if (nb_chan > 0) {
3217 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3218 if (*channels == NULL) {
3219 ret = -LTTCOMM_FATAL;
3220 goto error;
3221 }
54d01ffb 3222
b551a063
DG		 3223 list_lttng_channels(domain, session, *channels);
3224 } else {
3225 *channels = NULL;
3226 }
2bdd86d4 3227
54d01ffb
DG		 3228 return nb_chan;
3229
3230error:
3231 return ret;
3232}
3233
3234/*
3235 * Command LTTNG_LIST_EVENTS processed by the client thread.
3236 */
b551a063 3237static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3238 char *channel_name, struct lttng_event **events)
3239{
b551a063 3240 int ret = 0;
54d01ffb 3241 ssize_t nb_event = 0;
54d01ffb 3242
b551a063
DG		 3243 switch (domain) {
3244 case LTTNG_DOMAIN_KERNEL:
3245 if (session->kernel_session != NULL) {
3246 nb_event = list_lttng_kernel_events(channel_name,
3247 session->kernel_session, events);
54d01ffb 3248 }
b551a063
DG		 3249 break;
3250 case LTTNG_DOMAIN_UST:
3251 {
3252 if (session->ust_session != NULL) {
3253 nb_event = list_lttng_ust_global_events(channel_name,
3254 &session->ust_session->domain_global, events);
54d01ffb 3255 }
b551a063 3256 break;
54d01ffb 3257 }
b551a063
DG		 3258 default:
3259 ret = -LTTCOMM_NOT_IMPLEMENTED;
54d01ffb
DG		 3260 goto error;
3261 }
3262
b551a063 3263 ret = nb_event;
54d01ffb
DG		 3264
3265error:
3266 return ret;
3267}
3268
3269/*
3270 * Process the command requested by the lttng client within the command
3271 * context structure. This function make sure that the return structure (llm)
3272 * is set and ready for transmission before returning.
3273 *
3274 * Return any error encountered or 0 for success.
3275 */
3276static int process_client_msg(struct command_ctx *cmd_ctx)
3277{
3278 int ret = LTTCOMM_OK;
44d3bd01 3279 int need_tracing_session = 1;
54d01ffb
DG		 3280
3281 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3282
4fba7219
DG		 3283 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3284 ret = LTTCOMM_KERN_NA;
3285 goto error;
3286 }
3287
54d01ffb
DG		 3288 /*
3289 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3290 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3291 * command.
3292 */
3293 switch(cmd_ctx->lsm->cmd_type) {
3294 case LTTNG_LIST_SESSIONS:
3295 case LTTNG_LIST_TRACEPOINTS:
3296 case LTTNG_LIST_DOMAINS:
3297 case LTTNG_LIST_CHANNELS:
3298 case LTTNG_LIST_EVENTS:
3299 break;
3300 default:
3301 /* Setup lttng message with no payload */
3302 ret = setup_lttng_msg(cmd_ctx, 0);
3303 if (ret < 0) {
3304 /* This label does not try to unlock the session */
3305 goto init_setup_error;
3306 }
3307 }
3308
3309 /* Commands that DO NOT need a session. */
3310 switch (cmd_ctx->lsm->cmd_type) {
3311 case LTTNG_CALIBRATE:
3312 case LTTNG_CREATE_SESSION:
3313 case LTTNG_LIST_SESSIONS:
3314 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3315 need_tracing_session = 0;
54d01ffb
DG		 3316 break;
3317 default:
3318 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3319 session_lock_list();
54d01ffb 3320 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3321 session_unlock_list();
54d01ffb
DG		 3322 if (cmd_ctx->session == NULL) {
3323 if (cmd_ctx->lsm->session.name != NULL) {
3324 ret = LTTCOMM_SESS_NOT_FOUND;
3325 } else {
3326 /* If no session name specified */
3327 ret = LTTCOMM_SELECT_SESS;
3328 }
3329 goto error;
3330 } else {
3331 /* Acquire lock for the session */
3332 session_lock(cmd_ctx->session);
3333 }
3334 break;
3335 }
b389abbe 3336
54d01ffb
DG		 3337 /*
3338 * Check domain type for specific "pre-action".
3339 */
3340 switch (cmd_ctx->lsm->domain.type) {
3341 case LTTNG_DOMAIN_KERNEL:
3342 /* Kernel tracer check */
3343 if (kernel_tracer_fd == 0) {
3344 /* Basically, load kernel tracer modules */
3345 init_kernel_tracer();
3346 if (kernel_tracer_fd == 0) {
3347 ret = LTTCOMM_KERN_NA;
3348 goto error;
3349 }
3350 }
5eb91c98 3351
54d01ffb 3352 /* Need a session for kernel command */
44d3bd01 3353 if (need_tracing_session) {
54d01ffb
DG		 3354 if (cmd_ctx->session->kernel_session == NULL) {
3355 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3356 if (ret < 0) {
54d01ffb 3357 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3358 goto error;
3359 }
b389abbe 3360 }
7d29a247 3361
54d01ffb 3362 /* Start the kernel consumer daemon */
3bd1e081
MD		 3363 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3364 if (kconsumer_data.pid == 0 &&
54d01ffb 3365 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3366 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3367 ret = start_consumerd(&kconsumer_data);
7d29a247 3368 if (ret < 0) {
54d01ffb
DG		 3369 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3370 goto error;
950131af 3371 }
3ff2ecac
MD		 3372 } else {
3373 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3374 }
0d0c377a 3375 }
54d01ffb 3376 break;
2bdd86d4 3377 case LTTNG_DOMAIN_UST:
44d3bd01 3378 {
44d3bd01 3379 if (need_tracing_session) {
f6a9efaa 3380 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01
DG		 3381 ret = create_ust_session(cmd_ctx->session,
3382 &cmd_ctx->lsm->domain);
3383 if (ret != LTTCOMM_OK) {
3384 goto error;
3385 }
3386 }
7753dea8
MD		 3387 /* Start the UST consumer daemons */
3388 /* 64-bit */
3389 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3390 if (consumerd64_bin[0] != '\0' &&
7753dea8 3391 ustconsumer64_data.pid == 0 &&
2bdd86d4 3392 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3393 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3394 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3395 if (ret < 0) {
7753dea8
MD		 3396 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3397 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3398 goto error;
3399 }
48842b30 3400
7753dea8 3401 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3402 } else {
7753dea8
MD		 3403 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3404 }
3405 /* 32-bit */
fc7a59ce 3406 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3407 ustconsumer32_data.pid == 0 &&
3408 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3409 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3410 ret = start_consumerd(&ustconsumer32_data);
3411 if (ret < 0) {
3412 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3413 ust_consumerd32_fd = -EINVAL;
3414 goto error;
3415 }
3416 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3417 } else {
3418 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3419 }
44d3bd01
DG		 3420 }
3421 break;
3422 }
54d01ffb 3423 default:
54d01ffb
DG		 3424 break;
3425 }
33a2b854 3426
8e0af1b4
MD		 3427 /*
3428 * Check that the UID or GID match that of the tracing session.
3429 * The root user can interact with all sessions.
3430 */
3431 if (need_tracing_session) {
3432 if (!session_access_ok(cmd_ctx->session,
3433 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3434 ret = LTTCOMM_EPERM;
3435 goto error;
3436 }
3437 }
3438
54d01ffb
DG		 3439 /* Process by command type */
3440 switch (cmd_ctx->lsm->cmd_type) {
3441 case LTTNG_ADD_CONTEXT:
3442 {
3443 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3444 cmd_ctx->lsm->u.context.channel_name,
3445 cmd_ctx->lsm->u.context.event_name,
3446 &cmd_ctx->lsm->u.context.ctx);
3447 break;
3448 }
3449 case LTTNG_DISABLE_CHANNEL:
3450 {
3451 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3452 cmd_ctx->lsm->u.disable.channel_name);
3453 break;
3454 }
3455 case LTTNG_DISABLE_EVENT:
3456 {
3457 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3458 cmd_ctx->lsm->u.disable.channel_name,
3459 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3460 ret = LTTCOMM_OK;
3461 break;
3462 }
54d01ffb
DG		 3463 case LTTNG_DISABLE_ALL_EVENT:
3464 {
2bdd86d4 3465 DBG("Disabling all events");
54d01ffb
DG		 3466
3467 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3468 cmd_ctx->lsm->u.disable.channel_name);
3469 break;
3470 }
3471 case LTTNG_ENABLE_CHANNEL:
3472 {
aea829b3 3473 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3474 &cmd_ctx->lsm->u.channel.chan);
3475 break;
3476 }
3477 case LTTNG_ENABLE_EVENT:
3478 {
3479 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3480 cmd_ctx->lsm->u.enable.channel_name,
3481 &cmd_ctx->lsm->u.enable.event);
3482 break;
3483 }
3484 case LTTNG_ENABLE_ALL_EVENT:
3485 {
2bdd86d4 3486 DBG("Enabling all events");
54d01ffb
DG		 3487
3488 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3489 cmd_ctx->lsm->u.enable.channel_name,
3490 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3491 break;
3492 }
052da939 3493 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3494 {
9f19cc17 3495 struct lttng_event *events;
54d01ffb 3496 ssize_t nb_events;
052da939 3497
54d01ffb
DG		 3498 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3499 if (nb_events < 0) {
3500 ret = -nb_events;
3501 goto error;
2ef84c95
DG		 3502 }
3503
3504 /*
3505 * Setup lttng message with payload size set to the event list size in
3506 * bytes and then copy list into the llm payload.
3507 */
052da939 3508 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3509 if (ret < 0) {
052da939 3510 free(events);
2ef84c95
DG		 3511 goto setup_error;
3512 }
3513
3514 /* Copy event list into message payload */
9f19cc17 3515 memcpy(cmd_ctx->llm->payload, events,
052da939 3516 sizeof(struct lttng_event) * nb_events);
2ef84c95 3517
9f19cc17 3518 free(events);
2ef84c95
DG		 3519
3520 ret = LTTCOMM_OK;
3521 break;
3522 }
f3ed775e 3523 case LTTNG_START_TRACE:
8c0faa1d 3524 {
54d01ffb 3525 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3526 break;
3527 }
f3ed775e 3528 case LTTNG_STOP_TRACE:
8c0faa1d 3529 {
54d01ffb 3530 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3531 break;
3532 }
5e16da05
MD		 3533 case LTTNG_CREATE_SESSION:
3534 {
3c6bae61 3535 tracepoint(create_session_start);
54d01ffb 3536 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3537 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3c6bae61 3538 tracepoint(create_session_end);
5e16da05
MD		 3539 break;
3540 }
3541 case LTTNG_DESTROY_SESSION:
3542 {
3c6bae61 3543 tracepoint(destroy_session_start);
54d01ffb
DG		 3544 ret = cmd_destroy_session(cmd_ctx->session,
3545 cmd_ctx->lsm->session.name);
3c6bae61 3546 tracepoint(destroy_session_end);
5461b305 3547 break;
5e16da05 3548 }
9f19cc17 3549 case LTTNG_LIST_DOMAINS:
5e16da05 3550 {
54d01ffb
DG		 3551 ssize_t nb_dom;
3552 struct lttng_domain *domains;
5461b305 3553
54d01ffb
DG		 3554 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3555 if (nb_dom < 0) {
3556 ret = -nb_dom;
3557 goto error;
ce3d728c 3558 }
520ff687 3559
54d01ffb 3560 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3561 if (ret < 0) {
3562 goto setup_error;
520ff687 3563 }
57167058 3564
54d01ffb
DG		 3565 /* Copy event list into message payload */
3566 memcpy(cmd_ctx->llm->payload, domains,
3567 nb_dom * sizeof(struct lttng_domain));
3568
3569 free(domains);
5e16da05 3570
5461b305 3571 ret = LTTCOMM_OK;
5e16da05
MD		 3572 break;
3573 }
9f19cc17 3574 case LTTNG_LIST_CHANNELS:
5e16da05 3575 {
54d01ffb
DG		 3576 size_t nb_chan;
3577 struct lttng_channel *channels;
3578
b551a063
DG		 3579 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3580 cmd_ctx->session, &channels);
54d01ffb
DG		 3581 if (nb_chan < 0) {
3582 ret = -nb_chan;
3583 goto error;
5461b305 3584 }
ca95a216 3585
54d01ffb 3586 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3587 if (ret < 0) {
3588 goto setup_error;
3589 }
9f19cc17 3590
54d01ffb
DG		 3591 /* Copy event list into message payload */
3592 memcpy(cmd_ctx->llm->payload, channels,
3593 nb_chan * sizeof(struct lttng_channel));
3594
3595 free(channels);
9f19cc17
DG		 3596
3597 ret = LTTCOMM_OK;
5461b305 3598 break;
5e16da05 3599 }
9f19cc17 3600 case LTTNG_LIST_EVENTS:
5e16da05 3601 {
b551a063 3602 ssize_t nb_event;
684d34d2 3603 struct lttng_event *events = NULL;
9f19cc17 3604
b551a063 3605 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3606 cmd_ctx->lsm->u.list.channel_name, &events);
3607 if (nb_event < 0) {
3608 ret = -nb_event;
3609 goto error;
5461b305 3610 }
ca95a216 3611
54d01ffb 3612 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3613 if (ret < 0) {
3614 goto setup_error;
3615 }
9f19cc17 3616
54d01ffb
DG		 3617 /* Copy event list into message payload */
3618 memcpy(cmd_ctx->llm->payload, events,
3619 nb_event * sizeof(struct lttng_event));
9f19cc17 3620
54d01ffb 3621 free(events);
9f19cc17
DG		 3622
3623 ret = LTTCOMM_OK;
5461b305 3624 break;
5e16da05
MD		 3625 }
3626 case LTTNG_LIST_SESSIONS:
3627 {
8e0af1b4 3628 unsigned int nr_sessions;
5461b305 3629
8e0af1b4
MD		 3630 session_lock_list();
3631 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3632 if (nr_sessions == 0) {
f3ed775e 3633 ret = LTTCOMM_NO_SESSION;
54d01ffb 3634 session_unlock_list();
5461b305 3635 goto error;
57167058 3636 }
8e0af1b4 3637 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3638 if (ret < 0) {
54d01ffb 3639 session_unlock_list();
5461b305 3640 goto setup_error;
e065084a 3641 }
5e16da05 3642
6c9cc2ab 3643 /* Filled the session array */
8e0af1b4
MD		 3644 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3645 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
6c9cc2ab 3646
54d01ffb 3647 session_unlock_list();
5e16da05 3648
5461b305 3649 ret = LTTCOMM_OK;
5e16da05
MD		 3650 break;
3651 }
d0254c7c
MD		 3652 case LTTNG_CALIBRATE:
3653 {
54d01ffb
DG		 3654 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3655 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3656 break;
3657 }
d9800920
DG		 3658 case LTTNG_REGISTER_CONSUMER:
3659 {
54d01ffb
DG		 3660 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3661 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3662 break;
3663 }
5e16da05 3664 default:
5e16da05 3665 ret = LTTCOMM_UND;
5461b305 3666 break;
fac6795d
DG		 3667 }
3668
5461b305 3669error:
5461b305
DG		 3670 if (cmd_ctx->llm == NULL) {
3671 DBG("Missing llm structure. Allocating one.");
894be886 3672 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3673 goto setup_error;
3674 }
3675 }
54d01ffb 3676 /* Set return code */
5461b305 3677 cmd_ctx->llm->ret_code = ret;
5461b305 3678setup_error:
b5541356 3679 if (cmd_ctx->session) {
54d01ffb 3680 session_unlock(cmd_ctx->session);
b5541356 3681 }
54d01ffb 3682init_setup_error:
8028d920 3683 return ret;
fac6795d
DG		 3684}
3685
1d4b027a 3686/*
d063d709
DG		 3687 * This thread manage all clients request using the unix client socket for
3688 * communication.
1d4b027a
DG		 3689 */
3690static void *thread_manage_clients(void *data)
3691{
5eb91c98
DG		 3692 int sock = 0, ret, i, pollfd;
3693 uint32_t revents, nb_fd;
273ea72c 3694 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3695 struct lttng_poll_event events;
1d4b027a 3696
b25a8868
DG		 3697 tracepoint(sessiond_th_cli_start);
3698
1d4b027a
DG		 3699 DBG("[thread] Manage client started");
3700
f6a9efaa
DG		 3701 rcu_register_thread();
3702
1d4b027a
DG		 3703 ret = lttcomm_listen_unix_sock(client_sock);
3704 if (ret < 0) {
3705 goto error;
3706 }
3707
5eb91c98
DG		 3708 /*
3709 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3710 * more will be added to this poll set.
3711 */
3712 ret = create_thread_poll_set(&events, 2);
3713 if (ret < 0) {
3714 goto error;
3715 }
273ea72c 3716
5eb91c98
DG		 3717 /* Add the application registration socket */
3718 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3719 if (ret < 0) {
3720 goto error;
3721 }
273ea72c 3722
bbd973c2
DG		 3723 /*
3724 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3725 */
3726 if (opt_sig_parent) {
3727 kill(ppid, SIGCHLD);
3728 }
3729
3730 while (1) {
1d4b027a 3731 DBG("Accepting client command ...");
273ea72c 3732
b25a8868
DG		 3733 tracepoint(sessiond_th_cli_poll);
3734
5eb91c98
DG		 3735 nb_fd = LTTNG_POLL_GETNB(&events);
3736
273ea72c 3737 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3738 ret = lttng_poll_wait(&events, -1);
273ea72c 3739 if (ret < 0) {
273ea72c
DG		 3740 goto error;
3741 }
3742
5eb91c98
DG		 3743 for (i = 0; i < nb_fd; i++) {
3744 /* Fetch once the poll data */
3745 revents = LTTNG_POLL_GETEV(&events, i);
3746 pollfd = LTTNG_POLL_GETFD(&events, i);
3747
3748 /* Thread quit pipe has been closed. Killing thread. */
3749 ret = check_thread_quit_pipe(pollfd, revents);
3750 if (ret) {
3751 goto error;
3752 }
3753
3754 /* Event on the registration socket */
3755 if (pollfd == client_sock) {
3756 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3757 ERR("Client socket poll error");
3758 goto error;
3759 }
3760 }
273ea72c
DG		 3761 }
3762
5eb91c98
DG		 3763 DBG("Wait for client response");
3764
1d4b027a
DG		 3765 sock = lttcomm_accept_unix_sock(client_sock);
3766 if (sock < 0) {
3767 goto error;
3768 }
3769
be040666
DG		 3770 /* Set socket option for credentials retrieval */
3771 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3772 if (ret < 0) {
3773 goto error;
3774 }
3775
1d4b027a 3776 /* Allocate context command to process the client request */
ba7f0ae5 3777 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3778 if (cmd_ctx == NULL) {
ba7f0ae5 3779 perror("zmalloc cmd_ctx");
1d4b027a 3780 goto error;
5eb91c98 3781 }
1d4b027a
DG		 3782
3783 /* Allocate data buffer for reception */
ba7f0ae5 3784 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3785 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3786 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3787 goto error;
3788 }
1d4b027a 3789
1d4b027a
DG		 3790 cmd_ctx->llm = NULL;
3791 cmd_ctx->session = NULL;
3792
3793 /*
3794 * Data is received from the lttng client. The struct
3795 * lttcomm_session_msg (lsm) contains the command and data request of
3796 * the client.
3797 */
3798 DBG("Receiving data from client ...");
be040666
DG		 3799 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3800 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
1d4b027a 3801 if (ret <= 0) {
5eb91c98
DG		 3802 DBG("Nothing recv() from client... continuing");
3803 close(sock);
3804 free(cmd_ctx);
1d4b027a
DG		 3805 continue;
3806 }
3807
5eb91c98
DG		 3808 // TODO: Validate cmd_ctx including sanity check for
3809 // security purpose.
f7776ea7 3810
f6a9efaa 3811 rcu_thread_online();
1d4b027a
DG		 3812 /*
3813 * This function dispatch the work to the kernel or userspace tracer
3814 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3815 * informations for the client. The command context struct contains
3816 * everything this function may needs.
3817 */
3818 ret = process_client_msg(cmd_ctx);
f6a9efaa 3819 rcu_thread_offline();
1d4b027a 3820 if (ret < 0) {
bbd973c2 3821 /*
5eb91c98 3822 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3823 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3824 * (ENOMEM). Error detected but still accept command.
bbd973c2 3825 */
a2fb29a5 3826 clean_command_ctx(&cmd_ctx);
1d4b027a
DG		 3827 continue;
3828 }
3829
54d01ffb
DG		 3830 DBG("Sending response (size: %d, retcode: %s)",
3831 cmd_ctx->lttng_msg_size,
9a745bc7 3832 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3833 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
1d4b027a
DG		 3834 if (ret < 0) {
3835 ERR("Failed to send data back to client");
3836 }
3837
d6e4fca4
DG		 3838 /* End of transmission */
3839 close(sock);
be040666
DG		 3840
3841 clean_command_ctx(&cmd_ctx);
1d4b027a
DG		 3842 }
3843
3844error:
273ea72c 3845 DBG("Client thread dying");
273ea72c 3846 unlink(client_unix_sock_path);
5eb91c98
DG		 3847 close(client_sock);
3848 close(sock);
273ea72c 3849
5eb91c98 3850 lttng_poll_clean(&events);
a2fb29a5 3851 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3852
3853 rcu_unregister_thread();
1d4b027a
DG		 3854 return NULL;
3855}
3856
3857
fac6795d
DG		 3858/*
3859 * usage function on stderr
3860 */
3861static void usage(void)
3862{
b716ce68 3863 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3864 fprintf(stderr, " -h, --help Display this usage.\n");
3865 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3866 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3867 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3868 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3869 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3870 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3871 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3872 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3873 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3874 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3875 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3876 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3877 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3878 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3879 fprintf(stderr, " -V, --version Show version number.\n");
3880 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3881 fprintf(stderr, " -q, --quiet No output at all.\n");
3882 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3883 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3884 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3885}
3886
3887/*
3888 * daemon argument parsing
3889 */
3890static int parse_args(int argc, char **argv)
3891{
3892 int c;
3893
3894 static struct option long_options[] = {
3895 { "client-sock", 1, 0, 'c' },
3896 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3897 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3898 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3899 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3900 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3901 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3902 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3903 { "consumerd32-path", 1, 0, 'u' },
3904 { "consumerd32-libdir", 1, 0, 'U' },
3905 { "consumerd64-path", 1, 0, 't' },
3906 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3907 { "daemonize", 0, 0, 'd' },
5b8719f5 3908 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3909 { "help", 0, 0, 'h' },
3910 { "group", 1, 0, 'g' },
3911 { "version", 0, 0, 'V' },
75462a81 3912 { "quiet", 0, 0, 'q' },
3f9947db 3913 { "verbose", 0, 0, 'v' },
3bd1e081 3914 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3915 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3916 { NULL, 0, 0, 0 }
3917 };
3918
3919 while (1) {
3920 int option_index = 0;
4fba7219 3921 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3922 long_options, &option_index);
fac6795d
DG		 3923 if (c == -1) {
3924 break;
3925 }
3926
3927 switch (c) {
3928 case 0:
3929 fprintf(stderr, "option %s", long_options[option_index].name);
3930 if (optarg) {
3931 fprintf(stderr, " with arg %s\n", optarg);
3932 }
3933 break;
b716ce68 3934 case 'c':
fac6795d
DG		 3935 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3936 break;
3937 case 'a':
3938 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3939 break;
3940 case 'd':
3941 opt_daemon = 1;
3942 break;
3943 case 'g':
fb09408a 3944 opt_tracing_group = optarg;
fac6795d
DG		 3945 break;
3946 case 'h':
3947 usage();
3948 exit(EXIT_FAILURE);
3949 case 'V':
3950 fprintf(stdout, "%s\n", VERSION);
3951 exit(EXIT_SUCCESS);
5b8719f5
DG		 3952 case 'S':
3953 opt_sig_parent = 1;
3954 break;
d6f42150 3955 case 'E':
3bd1e081 3956 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3957 break;
3958 case 'C':
3bd1e081
MD		 3959 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3960 break;
3961 case 'F':
7753dea8 3962 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3963 break;
3964 case 'D':
7753dea8
MD		 3965 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3966 break;
3967 case 'H':
3968 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3969 break;
3970 case 'G':
3971 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3972 break;
4fba7219
DG		 3973 case 'N':
3974 opt_no_kernel = 1;
3975 break;
75462a81
DG		 3976 case 'q':
3977 opt_quiet = 1;
3978 break;
3f9947db 3979 case 'v':
53086306
DG		 3980 /* Verbose level can increase using multiple -v */
3981 opt_verbose += 1;
3f9947db 3982 break;
31f73cc9 3983 case 'Z':
3bd1e081 3984 opt_verbose_consumer += 1;
31f73cc9 3985 break;
fb09408a 3986 case 'u':
fc7a59ce 3987 consumerd32_bin= optarg;
ebaeda94
MD		 3988 break;
3989 case 'U':
3990 consumerd32_libdir = optarg;
7753dea8
MD		 3991 break;
3992 case 't':
fc7a59ce 3993 consumerd64_bin = optarg;
ebaeda94
MD		 3994 break;
3995 case 'T':
3996 consumerd64_libdir = optarg;
fb09408a 3997 break;
fac6795d
DG		 3998 default:
3999 /* Unknown option or other error.
4000 * Error is printed by getopt, just return */
4001 return -1;
4002 }
4003 }
4004
4005 return 0;
4006}
4007
4008/*
d063d709 4009 * Creates the two needed socket by the daemon.
d6f42150
DG		 4010 * apps_sock - The communication socket for all UST apps.
4011 * client_sock - The communication of the cli tool (lttng).
fac6795d 4012 */
cf3af59e 4013static int init_daemon_socket(void)
fac6795d
DG		 4014{
4015 int ret = 0;
4016 mode_t old_umask;
4017
4018 old_umask = umask(0);
4019
4020 /* Create client tool unix socket */
d6f42150
DG		 4021 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4022 if (client_sock < 0) {
4023 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 4024 ret = -1;
4025 goto end;
4026 }
4027
4028 /* File permission MUST be 660 */
4029 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4030 if (ret < 0) {
d6f42150 4031 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 4032 perror("chmod");
4033 goto end;
4034 }
4035
4036 /* Create the application unix socket */
d6f42150
DG		 4037 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4038 if (apps_sock < 0) {
4039 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 4040 ret = -1;
4041 goto end;
4042 }
4043
d6f42150 4044 /* File permission MUST be 666 */
54d01ffb
DG		 4045 ret = chmod(apps_unix_sock_path,
4046 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 4047 if (ret < 0) {
d6f42150 4048 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 4049 perror("chmod");
4050 goto end;
4051 }
4052
4053end:
4054 umask(old_umask);
4055 return ret;
4056}
4057
4058/*
54d01ffb
DG		 4059 * Check if the global socket is available, and if a daemon is answering at the
4060 * other side. If yes, error is returned.
fac6795d 4061 */
cf3af59e 4062static int check_existing_daemon(void)
fac6795d 4063{
7d8234d9 4064 if (access(client_unix_sock_path, F_OK) < 0 &&
099e26bd 4065 access(apps_unix_sock_path, F_OK) < 0) {
7d8234d9 4066 return 0;
099e26bd 4067 }
54d01ffb 4068
7d8234d9 4069 /* Is there anybody out there ? */
099e26bd 4070 if (lttng_session_daemon_alive()) {
7d8234d9 4071 return -EEXIST;
099e26bd 4072 } else {
7d8234d9 4073 return 0;
099e26bd 4074 }
fac6795d
DG		 4075}
4076
fac6795d 4077/*
d063d709 4078 * Set the tracing group gid onto the client socket.
5e16da05 4079 *
d063d709
DG		 4080 * Race window between mkdir and chown is OK because we are going from more
4081 * permissive (root.root) to les permissive (root.tracing).
fac6795d 4082 */
be040666 4083static int set_permissions(char *rundir)
fac6795d
DG		 4084{
4085 int ret;
996b65c8 4086 gid_t gid;
fac6795d 4087
996b65c8
MD		 4088 gid = allowed_group();
4089 if (gid < 0) {
be040666
DG		 4090 WARN("No tracing group detected");
4091 ret = 0;
fac6795d
DG		 4092 goto end;
4093 }
4094
d6f42150 4095 /* Set lttng run dir */
be040666 4096 ret = chown(rundir, 0, gid);
d6f42150 4097 if (ret < 0) {
be040666 4098 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 4099 perror("chown");
4100 }
4101
4102 /* lttng client socket path */
996b65c8 4103 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 4104 if (ret < 0) {
d6f42150
DG		 4105 ERR("Unable to set group on %s", client_unix_sock_path);
4106 perror("chown");
4107 }
4108
3bd1e081
MD		 4109 /* kconsumer error socket path */
4110 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 4111 if (ret < 0) {
3bd1e081
MD		 4112 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4113 perror("chown");
4114 }
4115
7753dea8
MD		 4116 /* 64-bit ustconsumer error socket path */
4117 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4118 if (ret < 0) {
4119 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4120 perror("chown");
4121 }
4122
4123 /* 32-bit ustconsumer compat32 error socket path */
4124 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 4125 if (ret < 0) {
7753dea8 4126 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 4127 perror("chown");
4128 }
4129
d6f42150 4130 DBG("All permissions are set");
e07ae692 4131
fac6795d
DG		 4132end:
4133 return ret;
4134}
4135
7a485870 4136/*
d063d709 4137 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 4138 */
4139static int create_kernel_poll_pipe(void)
4140{
4141 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4142}
4143
099e26bd
DG		 4144/*
4145 * Create the application command pipe to wake thread_manage_apps.
4146 */
4147static int create_apps_cmd_pipe(void)
4148{
4149 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4150}
4151
d6f42150 4152/*
d063d709 4153 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4154 */
67e40797 4155static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 4156{
4157 int ret;
4158
67e40797
DG		 4159 DBG3("Creating LTTng run directory: %s", rundir);
4160
4161 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
d6f42150 4162 if (ret < 0) {
b1f11e69 4163 if (errno != EEXIST) {
67e40797 4164 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4165 goto error;
4166 } else {
4167 ret = 0;
4168 }
d6f42150
DG		 4169 }
4170
4171error:
4172 return ret;
4173}
4174
4175/*
d063d709
DG		 4176 * Setup sockets and directory needed by the kconsumerd communication with the
4177 * session daemon.
d6f42150 4178 */
67e40797
DG		 4179static int set_consumer_sockets(struct consumer_data *consumer_data,
4180 const char *rundir)
d6f42150
DG		 4181{
4182 int ret;
67e40797 4183 char path[PATH_MAX];
d6f42150 4184
67e40797 4185 switch (consumer_data->type) {
7753dea8 4186 case LTTNG_CONSUMER_KERNEL:
67e40797 4187 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
7753dea8
MD		 4188 break;
4189 case LTTNG_CONSUMER64_UST:
67e40797 4190 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4191 break;
4192 case LTTNG_CONSUMER32_UST:
67e40797 4193 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4194 break;
4195 default:
4196 ERR("Consumer type unknown");
4197 ret = -EINVAL;
4198 goto error;
d6f42150
DG		 4199 }
4200
67e40797
DG		 4201 DBG2("Creating consumer directory: %s", path);
4202
3bd1e081 4203 ret = mkdir(path, S_IRWXU | S_IRWXG);
d6f42150 4204 if (ret < 0) {
6beb2242 4205 if (errno != EEXIST) {
3bd1e081 4206 ERR("Failed to create %s", path);
6beb2242
DG		 4207 goto error;
4208 }
4209 ret = 0;
d6f42150
DG		 4210 }
4211
4212 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4213 consumer_data->err_sock =
4214 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4215 if (consumer_data->err_sock < 0) {
4216 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4217 ret = -1;
4218 goto error;
4219 }
4220
4221 /* File permission MUST be 660 */
3bd1e081 4222 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4223 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4224 if (ret < 0) {
3bd1e081 4225 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4226 PERROR("chmod");
d6f42150
DG		 4227 goto error;
4228 }
4229
4230error:
4231 return ret;
4232}
4233
fac6795d 4234/*
d063d709 4235 * Signal handler for the daemon
cf3af59e 4236 *
54d01ffb
DG		 4237 * Simply stop all worker threads, leaving main() return gracefully after
4238 * joining all threads and calling cleanup().
fac6795d
DG		 4239 */
4240static void sighandler(int sig)
4241{
4242 switch (sig) {
cf3af59e
MD		 4243 case SIGPIPE:
4244 DBG("SIGPIPE catched");
4245 return;
4246 case SIGINT:
4247 DBG("SIGINT catched");
4248 stop_threads();
4249 break;
4250 case SIGTERM:
4251 DBG("SIGTERM catched");
4252 stop_threads();
4253 break;
4254 default:
4255 break;
fac6795d 4256 }
fac6795d
DG		 4257}
4258
4259/*
d063d709 4260 * Setup signal handler for :
1d4b027a 4261 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4262 */
1d4b027a 4263static int set_signal_handler(void)
fac6795d 4264{
1d4b027a
DG		 4265 int ret = 0;
4266 struct sigaction sa;
4267 sigset_t sigset;
fac6795d 4268
1d4b027a
DG		 4269 if ((ret = sigemptyset(&sigset)) < 0) {
4270 perror("sigemptyset");
4271 return ret;
4272 }
d6f42150 4273
1d4b027a
DG		 4274 sa.sa_handler = sighandler;
4275 sa.sa_mask = sigset;
4276 sa.sa_flags = 0;
4277 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4278 perror("sigaction");
4279 return ret;
d6f42150
DG		 4280 }
4281
1d4b027a
DG		 4282 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4283 perror("sigaction");
4284 return ret;
d6f42150 4285 }
aaf26714 4286
1d4b027a
DG		 4287 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4288 perror("sigaction");
4289 return ret;
8c0faa1d
DG		 4290 }
4291
1d4b027a
DG		 4292 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4293
4294 return ret;
fac6795d
DG		 4295}
4296
f3ed775e 4297/*
d063d709
DG		 4298 * Set open files limit to unlimited. This daemon can open a large number of
4299 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4300 */
4301static void set_ulimit(void)
4302{
4303 int ret;
4304 struct rlimit lim;
4305
a88df331 4306 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4307 lim.rlim_cur = 65535;
4308 lim.rlim_max = 65535;
4309
4310 ret = setrlimit(RLIMIT_NOFILE, &lim);
4311 if (ret < 0) {
4312 perror("failed to set open files limit");
4313 }
4314}
4315
fac6795d
DG		 4316/*
4317 * main
4318 */
4319int main(int argc, char **argv)
4320{
fac6795d
DG		 4321 int ret = 0;
4322 void *status;
b082db07 4323 const char *home_path;
fac6795d 4324
b25a8868 4325 tracepoint(sessiond_boot_start);
f6a9efaa 4326 rcu_register_thread();
b25a8868 4327
273ea72c 4328 /* Create thread quit pipe */
cf3af59e
MD		 4329 if ((ret = init_thread_quit_pipe()) < 0) {
4330 goto error;
273ea72c
DG		 4331 }
4332
7753dea8 4333 setup_consumerd_path();
fb09408a 4334
fac6795d
DG		 4335 /* Parse arguments */
4336 progname = argv[0];
4337 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4338 goto error;
fac6795d
DG		 4339 }
4340
4341 /* Daemonize */
4342 if (opt_daemon) {
53094c05
DG		 4343 ret = daemon(0, 0);
4344 if (ret < 0) {
4345 perror("daemon");
cf3af59e 4346 goto error;
53094c05 4347 }
fac6795d
DG		 4348 }
4349
4350 /* Check if daemon is UID = 0 */
4351 is_root = !getuid();
4352
fac6795d 4353 if (is_root) {
67e40797
DG		 4354 rundir = strdup(LTTNG_RUNDIR);
4355
4356 /* Create global run dir with root access */
4357 ret = create_lttng_rundir(rundir);
d6f42150 4358 if (ret < 0) {
cf3af59e 4359 goto error;
d6f42150
DG		 4360 }
4361
fac6795d 4362 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4363 snprintf(apps_unix_sock_path, PATH_MAX,
4364 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4365 }
4366
4367 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4368 snprintf(client_unix_sock_path, PATH_MAX,
4369 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4370 }
0fdd1e2c
DG		 4371
4372 /* Set global SHM for ust */
4373 if (strlen(wait_shm_path) == 0) {
4374 snprintf(wait_shm_path, PATH_MAX,
4375 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4376 }
67e40797
DG		 4377
4378 /* Setup kernel consumerd path */
4379 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4380 KCONSUMERD_ERR_SOCK_PATH, rundir);
4381 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4382 KCONSUMERD_CMD_SOCK_PATH, rundir);
4383
4384 DBG2("Kernel consumer err path: %s",
4385 kconsumer_data.err_unix_sock_path);
4386 DBG2("Kernel consumer cmd path: %s",
4387 kconsumer_data.cmd_unix_sock_path);
fac6795d 4388 } else {
b082db07
DG		 4389 home_path = get_home_dir();
4390 if (home_path == NULL) {
273ea72c
DG		 4391 /* TODO: Add --socket PATH option */
4392 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4393 ret = -EPERM;
4394 goto error;
b082db07
DG		 4395 }
4396
67e40797
DG		 4397 /*
4398 * Create rundir from home path. This will create something like
4399 * $HOME/.lttng
4400 */
4401 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4402 if (ret < 0) {
4403 ret = -ENOMEM;
4404 goto error;
4405 }
4406
4407 ret = create_lttng_rundir(rundir);
4408 if (ret < 0) {
4409 goto error;
4410 }
4411
fac6795d 4412 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4413 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4414 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4415 }
4416
4417 /* Set the cli tool unix socket path */
4418 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4419 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4420 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4421 }
0fdd1e2c
DG		 4422
4423 /* Set global SHM for ust */
4424 if (strlen(wait_shm_path) == 0) {
4425 snprintf(wait_shm_path, PATH_MAX,
4426 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4427 }
fac6795d
DG		 4428 }
4429
847177cd
DG		 4430 DBG("Client socket path %s", client_unix_sock_path);
4431 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4432 DBG("LTTng run directory path: %s", rundir);
4433
4434 /* 32 bits consumerd path setup */
4435 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4436 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4437 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4438 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4439
4440 DBG2("UST consumer 32 bits err path: %s",
4441 ustconsumer32_data.err_unix_sock_path);
4442 DBG2("UST consumer 32 bits cmd path: %s",
4443 ustconsumer32_data.cmd_unix_sock_path);
4444
4445 /* 64 bits consumerd path setup */
4446 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4447 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4448 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4449 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4450
4451 DBG2("UST consumer 64 bits err path: %s",
4452 ustconsumer64_data.err_unix_sock_path);
4453 DBG2("UST consumer 64 bits cmd path: %s",
4454 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4455
273ea72c 4456 /*
7d8234d9 4457 * See if daemon already exist.
fac6795d 4458 */
7d8234d9 4459 if ((ret = check_existing_daemon()) < 0) {
75462a81 4460 ERR("Already running daemon.\n");
273ea72c 4461 /*
cf3af59e
MD		 4462 * We do not goto exit because we must not cleanup()
4463 * because a daemon is already running.
ab118b20 4464 */
cf3af59e 4465 goto error;
a88df331
DG		 4466 }
4467
54d01ffb 4468 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4469
4470 /*
4471 * These actions must be executed as root. We do that *after* setting up
4472 * the sockets path because we MUST make the check for another daemon using
4473 * those paths *before* trying to set the kernel consumer sockets and init
4474 * kernel tracer.
4475 */
4476 if (is_root) {
67e40797 4477 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4478 if (ret < 0) {
4479 goto exit;
4480 }
4481
a88df331 4482 /* Setup kernel tracer */
4fba7219
DG		 4483 if (!opt_no_kernel) {
4484 init_kernel_tracer();
4485 }
a88df331
DG		 4486
4487 /* Set ulimit for open files */
4488 set_ulimit();
fac6795d
DG		 4489 }
4490
67e40797
DG		 4491 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4492 if (ret < 0) {
4493 goto exit;
4494 }
4495
4496 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4497 if (ret < 0) {
4498 goto exit;
4499 }
4500
cf3af59e
MD		 4501 if ((ret = set_signal_handler()) < 0) {
4502 goto exit;
fac6795d
DG		 4503 }
4504
d6f42150 4505 /* Setup the needed unix socket */
cf3af59e
MD		 4506 if ((ret = init_daemon_socket()) < 0) {
4507 goto exit;
fac6795d
DG		 4508 }
4509
4510 /* Set credentials to socket */
be040666 4511 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4512 goto exit;
fac6795d
DG		 4513 }
4514
5b8719f5
DG		 4515 /* Get parent pid if -S, --sig-parent is specified. */
4516 if (opt_sig_parent) {
4517 ppid = getppid();
4518 }
4519
7a485870 4520 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4521 if ((ret = create_kernel_poll_pipe()) < 0) {
4522 goto exit;
7a485870
DG		 4523 }
4524
099e26bd
DG		 4525 /* Setup the thread apps communication pipe. */
4526 if ((ret = create_apps_cmd_pipe()) < 0) {
4527 goto exit;
4528 }
4529
4530 /* Init UST command queue. */
4531 cds_wfq_init(&ust_cmd_queue.queue);
4532
f6a9efaa
DG		 4533 /* Init UST app hash table */
4534 ust_app_ht_alloc();
4535
273ea72c 4536 /*
54d01ffb
DG		 4537 * Get session list pointer. This pointer MUST NOT be free(). This list is
4538 * statically declared in session.c
273ea72c 4539 */
54d01ffb 4540 session_list_ptr = session_get_list();
b5541356 4541
5eb91c98
DG		 4542 /* Set up max poll set size */
4543 lttng_poll_set_max_size();
4544
cf3af59e 4545 /* Create thread to manage the client socket */
099e26bd
DG		 4546 ret = pthread_create(&client_thread, NULL,
4547 thread_manage_clients, (void *) NULL);
cf3af59e 4548 if (ret != 0) {
099e26bd 4549 perror("pthread_create clients");
cf3af59e
MD		 4550 goto exit_client;
4551 }
fac6795d 4552
099e26bd
DG		 4553 /* Create thread to dispatch registration */
4554 ret = pthread_create(&dispatch_thread, NULL,
4555 thread_dispatch_ust_registration, (void *) NULL);
4556 if (ret != 0) {
4557 perror("pthread_create dispatch");
4558 goto exit_dispatch;
4559 }
4560
4561 /* Create thread to manage application registration. */
4562 ret = pthread_create(&reg_apps_thread, NULL,
4563 thread_registration_apps, (void *) NULL);
4564 if (ret != 0) {
4565 perror("pthread_create registration");
4566 goto exit_reg_apps;
4567 }
4568
cf3af59e 4569 /* Create thread to manage application socket */
54d01ffb
DG		 4570 ret = pthread_create(&apps_thread, NULL,
4571 thread_manage_apps, (void *) NULL);
cf3af59e 4572 if (ret != 0) {
099e26bd 4573 perror("pthread_create apps");
cf3af59e
MD		 4574 goto exit_apps;
4575 }
fac6795d 4576
cf3af59e 4577 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4578 ret = pthread_create(&kernel_thread, NULL,
4579 thread_manage_kernel, (void *) NULL);
cf3af59e 4580 if (ret != 0) {
099e26bd 4581 perror("pthread_create kernel");
cf3af59e
MD		 4582 goto exit_kernel;
4583 }
7a485870 4584
b25a8868
DG		 4585 tracepoint(sessiond_boot_end);
4586
cf3af59e
MD		 4587 ret = pthread_join(kernel_thread, &status);
4588 if (ret != 0) {
4589 perror("pthread_join");
4590 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4591 }
4592
cf3af59e
MD		 4593exit_kernel:
4594 ret = pthread_join(apps_thread, &status);
4595 if (ret != 0) {
4596 perror("pthread_join");
4597 goto error; /* join error, exit without cleanup */
4598 }
fac6795d 4599
cf3af59e 4600exit_apps:
099e26bd
DG		 4601 ret = pthread_join(reg_apps_thread, &status);
4602 if (ret != 0) {
4603 perror("pthread_join");
4604 goto error; /* join error, exit without cleanup */
4605 }
4606
4607exit_reg_apps:
4608 ret = pthread_join(dispatch_thread, &status);
4609 if (ret != 0) {
4610 perror("pthread_join");
4611 goto error; /* join error, exit without cleanup */
4612 }
4613
4614exit_dispatch:
cf3af59e
MD		 4615 ret = pthread_join(client_thread, &status);
4616 if (ret != 0) {
4617 perror("pthread_join");
4618 goto error; /* join error, exit without cleanup */
4619 }
4620
3bd1e081 4621 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4622 if (ret != 0) {
3bd1e081 4623 perror("join_consumer");
cf3af59e
MD		 4624 goto error; /* join error, exit without cleanup */
4625 }
a88df331 4626
cf3af59e 4627exit_client:
a88df331 4628exit:
cf3af59e
MD		 4629 /*
4630 * cleanup() is called when no other thread is running.
4631 */
f6a9efaa 4632 rcu_thread_online();
cf3af59e 4633 cleanup();
f6a9efaa
DG		 4634 rcu_thread_offline();
4635 rcu_unregister_thread();
67e40797 4636 if (!ret) {
cf3af59e 4637 exit(EXIT_SUCCESS);
67e40797 4638 }
cf3af59e 4639error:
5e16da05 4640 exit(EXIT_FAILURE);
fac6795d 4641}
LTTng 2.0 tools and control repository
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