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fix: if tracing group does not exist, do not report a client error
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
CommitLineData
826d496d
MD		 1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
0fdd1e2c 3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
fac6795d 4 *
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
fac6795d
DG		 20#include <getopt.h>
21#include <grp.h>
22#include <limits.h>
23#include <pthread.h>
8c0faa1d 24#include <semaphore.h>
fac6795d
DG		 25#include <signal.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
0fdd1e2c 29#include <sys/mman.h>
b73401da 30#include <sys/mount.h>
1e307fab 31#include <sys/resource.h>
fac6795d
DG		 32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/types.h>
0fdd1e2c
DG		 35#include <sys/wait.h>
36#include <urcu/futex.h>
fac6795d 37#include <unistd.h>
3bd1e081 38#include <config.h>
fac6795d 39
990570ed 40#include <common/common.h>
0ba98ebc 41#include <common/compat/poll.h>
d27c42b8 42#include <common/compat/socket.h>
db758600
DG		 43#include <common/defaults.h>
44#include <common/kernel-consumer/kernel-consumer.h>
45#include <common/ust-consumer/ust-consumer.h>
fac6795d 46
10a8a223 47#include "lttng-sessiond.h"
54d01ffb 48#include "channel.h"
099e26bd 49#include "context.h"
54d01ffb 50#include "event.h"
099e26bd 51#include "futex.h"
4771f025 52#include "kernel.h"
096102bd 53#include "modprobe.h"
0fdd1e2c 54#include "shm.h"
1e307fab 55#include "ust-ctl.h"
8e68d1c8 56#include "utils.h"
fac6795d 57
ebaeda94
MD		 58#define CONSUMERD_FILE "lttng-consumerd"
59
3bd1e081
MD		 60struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76};
77
75462a81 78/* Const values */
686204ab 79const char default_home_dir[] = DEFAULT_HOME_DIR;
bbccc3d2 80const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
686204ab
MD		 81const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
fac6795d 84/* Variables */
1d4b027a 85int opt_verbose; /* Not static for lttngerr.h */
3bd1e081 86int opt_verbose_consumer; /* Not static for lttngerr.h */
1d4b027a 87int opt_quiet; /* Not static for lttngerr.h */
d063d709 88
fac6795d
DG		 89const char *progname;
90const char *opt_tracing_group;
5b8719f5 91static int opt_sig_parent;
fac6795d 92static int opt_daemon;
4fba7219 93static int opt_no_kernel;
fac6795d 94static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a 95static pid_t ppid; /* Parent PID for --sig-parent option */
67e40797 96static char *rundir;
3bd1e081
MD		 97
98/* Consumer daemon specific control data */
99static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
60922cb0
DG		 101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
3bd1e081 103};
7753dea8
MD		 104static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
60922cb0
DG		 106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
7753dea8
MD		 108};
109static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
60922cb0
DG		 111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
3bd1e081
MD		 113};
114
099e26bd 115static int dispatch_thread_exit;
fac6795d 116
54d01ffb
DG		 117/* Global application Unix socket path */
118static char apps_unix_sock_path[PATH_MAX];
119/* Global client Unix socket path */
120static char client_unix_sock_path[PATH_MAX];
54d01ffb
DG		 121/* global wait shm path for UST */
122static char wait_shm_path[PATH_MAX];
fac6795d 123
1d4b027a 124/* Sockets and FDs */
d6f42150
DG		 125static int client_sock;
126static int apps_sock;
20fe2104 127static int kernel_tracer_fd;
7a485870 128static int kernel_poll_pipe[2];
1d4b027a 129
273ea72c
DG		 130/*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134static int thread_quit_pipe[2];
135
099e26bd
DG		 136/*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140static int apps_cmd_pipe[2];
141
1d4b027a 142/* Pthread, Mutexes and Semaphores */
1d4b027a 143static pthread_t apps_thread;
099e26bd 144static pthread_t reg_apps_thread;
1d4b027a 145static pthread_t client_thread;
7a485870 146static pthread_t kernel_thread;
099e26bd 147static pthread_t dispatch_thread;
5eb91c98 148
fac6795d 149
099e26bd
DG		 150/*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
b5541356
DG		 159/*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
04ea676f 165 *
d063d709 166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
54d01ffb 167 * session_lock_list and session_unlock_list for lock acquisition.
b5541356
DG		 168 */
169static struct ltt_session_list *session_list_ptr;
170
7753dea8
MD		 171int ust_consumerd64_fd = -1;
172int ust_consumerd32_fd = -1;
173
fb6f1fa2
YB		 174static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
fb09408a
MD		 178
179static
7753dea8 180void setup_consumerd_path(void)
fb09408a 181{
fc7a59ce 182 const char *bin, *libdir;
fb09408a 183
7753dea8
MD		 184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
ebaeda94
MD		 186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
7753dea8 188 */
ebaeda94 189#if (CAA_BITS_PER_LONG == 32)
fc7a59ce
AM		 190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
ebaeda94
MD		 192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196#elif (CAA_BITS_PER_LONG == 64)
fc7a59ce
AM		 197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
7753dea8 199 }
ebaeda94
MD		 200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
7753dea8
MD		 202 }
203#else
204#error "Unknown bitness"
205#endif
206
fb09408a
MD		 207 /*
208 * runtime env. var. overrides the build default.
209 */
fc7a59ce
AM		 210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
7753dea8 213 }
fc7a59ce
AM		 214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
ebaeda94 217 }
72f579ee 218 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
ebaeda94
MD		 219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
72f579ee 222 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
ebaeda94
MD		 223 if (libdir) {
224 consumerd64_libdir = libdir;
fb09408a
MD		 225 }
226}
227
5eb91c98
DG		 228/*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233{
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254error:
255 return ret;
256}
257
258/*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263static int check_thread_quit_pipe(int fd, uint32_t events)
264{
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270}
271
0fdd1e2c
DG		 272/*
273 * Return group ID of the tracing group or -1 if not found.
274 */
996b65c8
MD		 275static gid_t allowed_group(void)
276{
277 struct group *grp;
278
274e143b
MD		 279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
996b65c8
MD		 284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289}
290
273ea72c 291/*
5eb91c98 292 * Init thread quit pipe.
273ea72c
DG		 293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296static int init_thread_quit_pipe(void)
297{
730389d9 298 int ret, i;
273ea72c 299
730389d9 300 ret = pipe(thread_quit_pipe);
273ea72c 301 if (ret < 0) {
730389d9 302 PERROR("thread quit pipe");
273ea72c
DG		 303 goto error;
304 }
305
730389d9
DG		 306 for (i = 0; i < 2; i++) {
307 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
308 if (ret < 0) {
309 PERROR("fcntl");
310 goto error;
311 }
312 }
313
273ea72c
DG		 314error:
315 return ret;
316}
317
fac6795d 318/*
d063d709
DG		 319 * Complete teardown of a kernel session. This free all data structure related
320 * to a kernel session and update counter.
fac6795d 321 */
1d4b027a 322static void teardown_kernel_session(struct ltt_session *session)
fac6795d 323{
8f7a84dd 324 if (!session->kernel_session) {
99bab54f 325 DBG3("No kernel session when tearing down session");
84ea9c99 326 return;
8f7a84dd
DG		 327 }
328
84ea9c99 329 DBG("Tearing down kernel session");
d9800920 330
84ea9c99
MD		 331 /*
332 * If a custom kernel consumer was registered, close the socket before
333 * tearing down the complete kernel session structure
334 */
335 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
336 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
fac6795d 337 }
84ea9c99
MD		 338
339 trace_kernel_destroy_session(session->kernel_session);
fac6795d
DG		 340}
341
f6a9efaa
DG		 342/*
343 * Complete teardown of all UST sessions. This will free everything on his path
344 * and destroy the core essence of all ust sessions :)
345 */
346static void teardown_ust_session(struct ltt_session *session)
347{
84cd17c6
MD		 348 int ret;
349
8f7a84dd 350 if (!session->ust_session) {
99bab54f 351 DBG3("No UST session when tearing down session");
f470a390 352 return;
8f7a84dd
DG		 353 }
354
84ea9c99 355 DBG("Tearing down UST session(s)");
8f7a84dd 356
84cd17c6
MD		 357 ret = ust_app_destroy_trace_all(session->ust_session);
358 if (ret) {
359 ERR("Error in ust_app_destroy_trace_all");
360 }
8f7a84dd 361
f6a9efaa
DG		 362 trace_ust_destroy_session(session->ust_session);
363}
364
099e26bd
DG		 365/*
366 * Stop all threads by closing the thread quit pipe.
367 */
cf3af59e
MD		 368static void stop_threads(void)
369{
5eb91c98
DG		 370 int ret;
371
cf3af59e
MD		 372 /* Stopping all threads */
373 DBG("Terminating all threads");
54d01ffb 374 ret = notify_thread_pipe(thread_quit_pipe[1]);
5eb91c98
DG		 375 if (ret < 0) {
376 ERR("write error on thread quit pipe");
377 }
378
099e26bd
DG		 379 /* Dispatch thread */
380 dispatch_thread_exit = 1;
381 futex_nto1_wake(&ust_cmd_queue.futex);
cf3af59e
MD		 382}
383
fac6795d 384/*
d063d709 385 * Cleanup the daemon
fac6795d 386 */
cf3af59e 387static void cleanup(void)
fac6795d 388{
1d4b027a
DG		 389 int ret;
390 char *cmd;
af9737e9 391 struct ltt_session *sess, *stmp;
fac6795d 392
1d4b027a 393 DBG("Cleaning up");
e07ae692 394
67e40797
DG		 395 DBG("Removing %s directory", rundir);
396 ret = asprintf(&cmd, "rm -rf %s", rundir);
397 if (ret < 0) {
398 ERR("asprintf failed. Something is really wrong!");
399 }
5461b305 400
67e40797
DG		 401 /* Remove lttng run directory */
402 ret = system(cmd);
403 if (ret < 0) {
404 ERR("Unable to clean %s", rundir);
1d4b027a 405 }
67e40797 406 free(cmd);
5461b305 407
99bab54f 408 DBG("Cleaning up all sessions");
fac6795d 409
b5541356 410 /* Destroy session list mutex */
273ea72c
DG		 411 if (session_list_ptr != NULL) {
412 pthread_mutex_destroy(&session_list_ptr->lock);
413
414 /* Cleanup ALL session */
54d01ffb
DG		 415 cds_list_for_each_entry_safe(sess, stmp,
416 &session_list_ptr->head, list) {
273ea72c 417 teardown_kernel_session(sess);
f6a9efaa
DG		 418 teardown_ust_session(sess);
419 free(sess);
273ea72c
DG		 420 }
421 }
422
099e26bd 423 DBG("Closing all UST sockets");
56fff090 424 ust_app_clean_list();
099e26bd 425
3bd1e081 426 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
b5541356 427
4fba7219
DG		 428 if (is_root && !opt_no_kernel) {
429 DBG2("Closing kernel fd");
430 close(kernel_tracer_fd);
2f50c8a3 431 DBG("Unloading kernel modules");
096102bd 432 modprobe_remove_lttng_all();
2f50c8a3 433 }
5eb91c98
DG		 434
435 close(thread_quit_pipe[0]);
436 close(thread_quit_pipe[1]);
421cb601
DG		 437
438 /* <fun> */
f56a39af 439 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
421cb601
DG		 440 "Matthew, BEET driven development works!%c[%dm",
441 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
442 /* </fun> */
fac6795d
DG		 443}
444
e065084a 445/*
d063d709 446 * Send data on a unix socket using the liblttsessiondcomm API.
e065084a 447 *
d063d709 448 * Return lttcomm error code.
e065084a
DG		 449 */
450static int send_unix_sock(int sock, void *buf, size_t len)
451{
452 /* Check valid length */
453 if (len <= 0) {
454 return -1;
455 }
456
457 return lttcomm_send_unix_sock(sock, buf, len);
458}
459
5461b305 460/*
d063d709 461 * Free memory of a command context structure.
5461b305 462 */
a2fb29a5 463static void clean_command_ctx(struct command_ctx **cmd_ctx)
5461b305 464{
a2fb29a5
DG		 465 DBG("Clean command context structure");
466 if (*cmd_ctx) {
467 if ((*cmd_ctx)->llm) {
468 free((*cmd_ctx)->llm);
5461b305 469 }
a2fb29a5
DG		 470 if ((*cmd_ctx)->lsm) {
471 free((*cmd_ctx)->lsm);
5461b305 472 }
a2fb29a5
DG		 473 free(*cmd_ctx);
474 *cmd_ctx = NULL;
5461b305
DG		 475 }
476}
477
f3ed775e 478/*
d063d709 479 * Send all stream fds of kernel channel to the consumer.
f3ed775e 480 */
2bdd86d4 481static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
6df2e2c9
MD		 482 int sock, struct ltt_kernel_channel *channel,
483 uid_t uid, gid_t gid)
f3ed775e
DG		 484{
485 int ret;
f3ed775e 486 struct ltt_kernel_stream *stream;
3bd1e081 487 struct lttcomm_consumer_msg lkm;
f3ed775e 488
3bd1e081 489 DBG("Sending streams of channel %s to kernel consumer",
54d01ffb 490 channel->channel->name);
f3ed775e 491
3bd1e081
MD		 492 /* Send channel */
493 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
494 lkm.u.channel.channel_key = channel->fd;
495 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
496 lkm.u.channel.mmap_len = 0; /* for kernel */
2bdd86d4 497 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
3bd1e081 498 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
f3ed775e 499 if (ret < 0) {
3bd1e081 500 perror("send consumer channel");
f3ed775e
DG		 501 goto error;
502 }
503
3bd1e081 504 /* Send streams */
7a485870 505 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
3bd1e081
MD		 506 if (!stream->fd) {
507 continue;
508 }
509 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
510 lkm.u.stream.channel_key = channel->fd;
511 lkm.u.stream.stream_key = stream->fd;
512 lkm.u.stream.state = stream->state;
513 lkm.u.stream.output = channel->channel->attr.output;
514 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 515 lkm.u.stream.uid = uid;
516 lkm.u.stream.gid = gid;
3bd1e081
MD		 517 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
518 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
519 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
520 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
521 if (ret < 0) {
522 perror("send consumer stream");
523 goto error;
524 }
525 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
526 if (ret < 0) {
527 perror("send consumer stream ancillary data");
528 goto error;
f3ed775e
DG		 529 }
530 }
531
3bd1e081 532 DBG("consumer channel streams sent");
f3ed775e
DG		 533
534 return 0;
535
536error:
537 return ret;
538}
539
540/*
d063d709 541 * Send all stream fds of the kernel session to the consumer.
f3ed775e 542 */
2bdd86d4 543static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
3bd1e081 544 struct ltt_kernel_session *session)
f3ed775e
DG		 545{
546 int ret;
547 struct ltt_kernel_channel *chan;
3bd1e081
MD		 548 struct lttcomm_consumer_msg lkm;
549 int sock = session->consumer_fd;
7a485870
DG		 550
551 DBG("Sending metadata stream fd");
552
2bdd86d4 553 /* Extra protection. It's NOT supposed to be set to 0 at this point */
d9800920 554 if (session->consumer_fd == 0) {
3bd1e081 555 session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 556 }
557
7a485870 558 if (session->metadata_stream_fd != 0) {
3bd1e081
MD		 559 /* Send metadata channel fd */
560 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
561 lkm.u.channel.channel_key = session->metadata->fd;
562 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
563 lkm.u.channel.mmap_len = 0; /* for kernel */
564 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
565 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
566 if (ret < 0) {
567 perror("send consumer channel");
568 goto error;
569 }
570
571 /* Send metadata stream fd */
572 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
573 lkm.u.stream.channel_key = session->metadata->fd;
574 lkm.u.stream.stream_key = session->metadata_stream_fd;
575 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
576 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
577 lkm.u.stream.mmap_len = 0; /* for kernel */
6df2e2c9
MD		 578 lkm.u.stream.uid = session->uid;
579 lkm.u.stream.gid = session->gid;
3bd1e081
MD		 580 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
581 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
582 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
583 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
584 if (ret < 0) {
585 perror("send consumer stream");
586 goto error;
587 }
588 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
7a485870 589 if (ret < 0) {
3bd1e081 590 perror("send consumer stream");
7a485870
DG		 591 goto error;
592 }
593 }
f3ed775e 594
f3ed775e 595 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
6df2e2c9
MD		 596 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
597 session->uid, session->gid);
2bdd86d4
MD		 598 if (ret < 0) {
599 goto error;
600 }
601 }
602
603 DBG("consumer fds (metadata and channel streams) sent");
604
605 return 0;
606
607error:
608 return ret;
609}
610
fac6795d 611/*
0fdd1e2c 612 * Notify UST applications using the shm mmap futex.
fac6795d 613 */
0fdd1e2c 614static int notify_ust_apps(int active)
fac6795d 615{
0fdd1e2c 616 char *wait_shm_mmap;
fac6795d 617
0fdd1e2c 618 DBG("Notifying applications of session daemon state: %d", active);
e07ae692 619
0fdd1e2c
DG		 620 /* See shm.c for this call implying mmap, shm and futex calls */
621 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
622 if (wait_shm_mmap == NULL) {
fac6795d
DG		 623 goto error;
624 }
625
0fdd1e2c
DG		 626 /* Wake waiting process */
627 futex_wait_update((int32_t *) wait_shm_mmap, active);
628
629 /* Apps notified successfully */
630 return 0;
fac6795d
DG		 631
632error:
0fdd1e2c 633 return -1;
fac6795d
DG		 634}
635
e065084a 636/*
d063d709
DG		 637 * Setup the outgoing data buffer for the response (llm) by allocating the
638 * right amount of memory and copying the original information from the lsm
639 * structure.
ca95a216 640 *
d063d709 641 * Return total size of the buffer pointed by buf.
ca95a216 642 */
5461b305 643static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 644{
f3ed775e 645 int ret, buf_size;
ca95a216 646
f3ed775e 647 buf_size = size;
5461b305 648
ba7f0ae5 649 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
5461b305 650 if (cmd_ctx->llm == NULL) {
ba7f0ae5 651 perror("zmalloc");
5461b305 652 ret = -ENOMEM;
ca95a216
DG		 653 goto error;
654 }
655
5461b305
DG		 656 /* Copy common data */
657 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
9f19cc17 658 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
5461b305 659
5461b305
DG		 660 cmd_ctx->llm->data_size = size;
661 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
662
ca95a216
DG		 663 return buf_size;
664
665error:
666 return ret;
667}
668
7a485870 669/*
5eb91c98 670 * Update the kernel poll set of all channel fd available over all tracing
d063d709 671 * session. Add the wakeup pipe at the end of the set.
7a485870 672 */
5eb91c98 673static int update_kernel_poll(struct lttng_poll_event *events)
7a485870 674{
5eb91c98 675 int ret;
7a485870
DG		 676 struct ltt_session *session;
677 struct ltt_kernel_channel *channel;
678
5eb91c98 679 DBG("Updating kernel poll set");
7a485870 680
54d01ffb 681 session_lock_list();
b5541356 682 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 683 session_lock(session);
7a485870 684 if (session->kernel_session == NULL) {
54d01ffb 685 session_unlock(session);
7a485870
DG		 686 continue;
687 }
7a485870 688
54d01ffb
DG		 689 cds_list_for_each_entry(channel,
690 &session->kernel_session->channel_list.head, list) {
5eb91c98
DG		 691 /* Add channel fd to the kernel poll set */
692 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
693 if (ret < 0) {
54d01ffb 694 session_unlock(session);
5eb91c98
DG		 695 goto error;
696 }
697 DBG("Channel fd %d added to kernel set", channel->fd);
7a485870 698 }
54d01ffb 699 session_unlock(session);
7a485870 700 }
54d01ffb 701 session_unlock_list();
7a485870 702
5eb91c98 703 return 0;
7a485870
DG		 704
705error:
54d01ffb 706 session_unlock_list();
7a485870
DG		 707 return -1;
708}
709
710/*
54d01ffb 711 * Find the channel fd from 'fd' over all tracing session. When found, check
d063d709 712 * for new channel stream and send those stream fds to the kernel consumer.
7a485870 713 *
d063d709 714 * Useful for CPU hotplug feature.
7a485870 715 */
2bdd86d4 716static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
7a485870
DG		 717{
718 int ret = 0;
719 struct ltt_session *session;
720 struct ltt_kernel_channel *channel;
721
722 DBG("Updating kernel streams for channel fd %d", fd);
723
54d01ffb 724 session_lock_list();
b5541356 725 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
54d01ffb 726 session_lock(session);
7a485870 727 if (session->kernel_session == NULL) {
54d01ffb 728 session_unlock(session);
7a485870
DG		 729 continue;
730 }
d9800920
DG		 731
732 /* This is not suppose to be 0 but this is an extra security check */
733 if (session->kernel_session->consumer_fd == 0) {
3bd1e081 734 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
d9800920
DG		 735 }
736
5eb91c98
DG		 737 cds_list_for_each_entry(channel,
738 &session->kernel_session->channel_list.head, list) {
7a485870
DG		 739 if (channel->fd == fd) {
740 DBG("Channel found, updating kernel streams");
741 ret = kernel_open_channel_stream(channel);
742 if (ret < 0) {
b3c750d2 743 goto error;
7a485870 744 }
d9800920 745
7a485870 746 /*
5eb91c98
DG		 747 * Have we already sent fds to the consumer? If yes, it means
748 * that tracing is started so it is safe to send our updated
749 * stream fds.
7a485870 750 */
3bd1e081 751 if (session->kernel_session->consumer_fds_sent == 1) {
2bdd86d4 752 ret = send_kconsumer_channel_streams(consumer_data,
6df2e2c9
MD		 753 session->kernel_session->consumer_fd, channel,
754 session->uid, session->gid);
7a485870 755 if (ret < 0) {
b3c750d2 756 goto error;
7a485870
DG		 757 }
758 }
b3c750d2 759 goto error;
7a485870
DG		 760 }
761 }
54d01ffb 762 session_unlock(session);
7a485870 763 }
54d01ffb 764 session_unlock_list();
b3c750d2 765 return ret;
7a485870 766
b3c750d2 767error:
54d01ffb
DG		 768 session_unlock(session);
769 session_unlock_list();
7a485870
DG		 770 return ret;
771}
772
487cf67c
DG		 773/*
774 * For each tracing session, update newly registered apps.
775 */
776static void update_ust_app(int app_sock)
777{
778 struct ltt_session *sess, *stmp;
779
4ee14516
DG		 780 session_lock_list();
781
487cf67c
DG		 782 /* For all tracing session(s) */
783 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
4ee14516 784 session_lock(sess);
421cb601
DG		 785 if (sess->ust_session) {
786 ust_app_global_update(sess->ust_session, app_sock);
787 }
4ee14516 788 session_unlock(sess);
487cf67c 789 }
4ee14516
DG		 790
791 session_unlock_list();
487cf67c
DG		 792}
793
7a485870 794/*
d063d709 795 * This thread manage event coming from the kernel.
7a485870 796 *
d063d709
DG		 797 * Features supported in this thread:
798 * -) CPU Hotplug
7a485870
DG		 799 */
800static void *thread_manage_kernel(void *data)
801{
5eb91c98
DG		 802 int ret, i, pollfd, update_poll_flag = 1;
803 uint32_t revents, nb_fd;
7a485870 804 char tmp;
5eb91c98 805 struct lttng_poll_event events;
7a485870
DG		 806
807 DBG("Thread manage kernel started");
808
5eb91c98
DG		 809 ret = create_thread_poll_set(&events, 2);
810 if (ret < 0) {
811 goto error;
812 }
813
814 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
815 if (ret < 0) {
816 goto error;
817 }
818
7a485870
DG		 819 while (1) {
820 if (update_poll_flag == 1) {
5f822d0a
DG		 821 /*
822 * Reset number of fd in the poll set. Always 2 since there is the thread
823 * quit pipe and the kernel pipe.
824 */
825 events.nb_fd = 2;
826
5eb91c98
DG		 827 ret = update_kernel_poll(&events);
828 if (ret < 0) {
7a485870
DG		 829 goto error;
830 }
831 update_poll_flag = 0;
832 }
833
5eb91c98
DG		 834 nb_fd = LTTNG_POLL_GETNB(&events);
835
836 DBG("Thread kernel polling on %d fds", nb_fd);
837
838 /* Zeroed the poll events */
839 lttng_poll_reset(&events);
7a485870
DG		 840
841 /* Poll infinite value of time */
5eb91c98 842 ret = lttng_poll_wait(&events, -1);
7a485870 843 if (ret < 0) {
7a485870
DG		 844 goto error;
845 } else if (ret == 0) {
846 /* Should not happen since timeout is infinite */
85611738
DG		 847 ERR("Return value of poll is 0 with an infinite timeout.\n"
848 "This should not have happened! Continuing...");
7a485870
DG		 849 continue;
850 }
851
5eb91c98
DG		 852 for (i = 0; i < nb_fd; i++) {
853 /* Fetch once the poll data */
854 revents = LTTNG_POLL_GETEV(&events, i);
855 pollfd = LTTNG_POLL_GETFD(&events, i);
7a485870 856
5eb91c98
DG		 857 /* Thread quit pipe has been closed. Killing thread. */
858 ret = check_thread_quit_pipe(pollfd, revents);
859 if (ret) {
860 goto error;
861 }
7a485870 862
5eb91c98
DG		 863 /* Check for data on kernel pipe */
864 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
865 ret = read(kernel_poll_pipe[0], &tmp, 1);
866 update_poll_flag = 1;
867 continue;
868 } else {
869 /*
870 * New CPU detected by the kernel. Adding kernel stream to
871 * kernel session and updating the kernel consumer
872 */
873 if (revents & LPOLLIN) {
2bdd86d4 874 ret = update_kernel_stream(&kconsumer_data, pollfd);
5eb91c98
DG		 875 if (ret < 0) {
876 continue;
877 }
878 break;
879 /*
880 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
881 * and unregister kernel stream at this point.
882 */
7a485870 883 }
7a485870
DG		 884 }
885 }
886 }
887
888error:
889 DBG("Kernel thread dying");
273ea72c
DG		 890 close(kernel_poll_pipe[0]);
891 close(kernel_poll_pipe[1]);
5eb91c98
DG		 892
893 lttng_poll_clean(&events);
894
7a485870
DG		 895 return NULL;
896}
897
1d4b027a 898/*
3bd1e081 899 * This thread manage the consumer error sent back to the session daemon.
1d4b027a 900 */
3bd1e081 901static void *thread_manage_consumer(void *data)
1d4b027a 902{
5eb91c98
DG		 903 int sock = 0, i, ret, pollfd;
904 uint32_t revents, nb_fd;
1d4b027a 905 enum lttcomm_return_code code;
5eb91c98 906 struct lttng_poll_event events;
3bd1e081 907 struct consumer_data *consumer_data = data;
1d4b027a 908
3bd1e081 909 DBG("[thread] Manage consumer started");
1d4b027a 910
3bd1e081 911 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 912 if (ret < 0) {
913 goto error;
914 }
915
5eb91c98
DG		 916 /*
917 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
918 * Nothing more will be added to this poll set.
919 */
920 ret = create_thread_poll_set(&events, 2);
921 if (ret < 0) {
922 goto error;
923 }
273ea72c 924
3bd1e081 925 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
5eb91c98
DG		 926 if (ret < 0) {
927 goto error;
928 }
929
930 nb_fd = LTTNG_POLL_GETNB(&events);
273ea72c
DG		 931
932 /* Inifinite blocking call, waiting for transmission */
5eb91c98 933 ret = lttng_poll_wait(&events, -1);
273ea72c 934 if (ret < 0) {
273ea72c
DG		 935 goto error;
936 }
937
5eb91c98
DG		 938 for (i = 0; i < nb_fd; i++) {
939 /* Fetch once the poll data */
940 revents = LTTNG_POLL_GETEV(&events, i);
941 pollfd = LTTNG_POLL_GETFD(&events, i);
942
943 /* Thread quit pipe has been closed. Killing thread. */
944 ret = check_thread_quit_pipe(pollfd, revents);
945 if (ret) {
946 goto error;
947 }
948
949 /* Event on the registration socket */
3bd1e081 950 if (pollfd == consumer_data->err_sock) {
5eb91c98 951 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 952 ERR("consumer err socket poll error");
5eb91c98
DG		 953 goto error;
954 }
955 }
273ea72c
DG		 956 }
957
3bd1e081 958 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1d4b027a
DG		 959 if (sock < 0) {
960 goto error;
961 }
962
3bd1e081 963 DBG2("Receiving code from consumer err_sock");
ee0b0061 964
712ea556 965 /* Getting status code from kconsumerd */
54d01ffb
DG		 966 ret = lttcomm_recv_unix_sock(sock, &code,
967 sizeof(enum lttcomm_return_code));
1d4b027a
DG		 968 if (ret <= 0) {
969 goto error;
970 }
971
3bd1e081
MD		 972 if (code == CONSUMERD_COMMAND_SOCK_READY) {
973 consumer_data->cmd_sock =
974 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
975 if (consumer_data->cmd_sock < 0) {
976 sem_post(&consumer_data->sem);
48842b30 977 PERROR("consumer connect");
1d4b027a
DG		 978 goto error;
979 }
980 /* Signal condition to tell that the kconsumerd is ready */
3bd1e081
MD		 981 sem_post(&consumer_data->sem);
982 DBG("consumer command socket ready");
1d4b027a 983 } else {
3bd1e081 984 ERR("consumer error when waiting for SOCK_READY : %s",
1d4b027a
DG		 985 lttcomm_get_readable_code(-code));
986 goto error;
987 }
988
54d01ffb 989 /* Remove the kconsumerd error sock since we've established a connexion */
3bd1e081 990 ret = lttng_poll_del(&events, consumer_data->err_sock);
72079cae 991 if (ret < 0) {
72079cae
DG		 992 goto error;
993 }
994
5eb91c98
DG		 995 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
996 if (ret < 0) {
72079cae 997 goto error;
5eb91c98
DG		 998 }
999
1000 /* Update number of fd */
1001 nb_fd = LTTNG_POLL_GETNB(&events);
1002
1003 /* Inifinite blocking call, waiting for transmission */
1004 ret = lttng_poll_wait(&events, -1);
1005 if (ret < 0) {
72079cae
DG		 1006 goto error;
1007 }
1008
5eb91c98
DG		 1009 for (i = 0; i < nb_fd; i++) {
1010 /* Fetch once the poll data */
1011 revents = LTTNG_POLL_GETEV(&events, i);
1012 pollfd = LTTNG_POLL_GETFD(&events, i);
1013
1014 /* Thread quit pipe has been closed. Killing thread. */
1015 ret = check_thread_quit_pipe(pollfd, revents);
1016 if (ret) {
1017 goto error;
1018 }
1019
1020 /* Event on the kconsumerd socket */
1021 if (pollfd == sock) {
1022 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3bd1e081 1023 ERR("consumer err socket second poll error");
5eb91c98
DG		 1024 goto error;
1025 }
1026 }
1027 }
1028
712ea556 1029 /* Wait for any kconsumerd error */
54d01ffb
DG		 1030 ret = lttcomm_recv_unix_sock(sock, &code,
1031 sizeof(enum lttcomm_return_code));
712ea556 1032 if (ret <= 0) {
3bd1e081 1033 ERR("consumer closed the command socket");
712ea556 1034 goto error;
6f61d021 1035 }
1d4b027a 1036
3bd1e081 1037 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
712ea556 1038
1d4b027a 1039error:
3bd1e081
MD		 1040 DBG("consumer thread dying");
1041 close(consumer_data->err_sock);
1042 close(consumer_data->cmd_sock);
5eb91c98 1043 close(sock);
273ea72c 1044
3bd1e081
MD		 1045 unlink(consumer_data->err_unix_sock_path);
1046 unlink(consumer_data->cmd_unix_sock_path);
1047 consumer_data->pid = 0;
1d4b027a 1048
5eb91c98 1049 lttng_poll_clean(&events);
0177d773 1050
5eb91c98 1051 return NULL;
099e26bd
DG		 1052}
1053
099e26bd
DG		 1054/*
1055 * This thread manage application communication.
1d4b027a
DG		 1056 */
1057static void *thread_manage_apps(void *data)
099e26bd 1058{
5eb91c98
DG		 1059 int i, ret, pollfd;
1060 uint32_t revents, nb_fd;
099e26bd 1061 struct ust_command ust_cmd;
5eb91c98 1062 struct lttng_poll_event events;
099e26bd
DG		 1063
1064 DBG("[thread] Manage application started");
1065
f6a9efaa
DG		 1066 rcu_register_thread();
1067 rcu_thread_online();
1068
5eb91c98
DG		 1069 ret = create_thread_poll_set(&events, 2);
1070 if (ret < 0) {
1071 goto error;
1072 }
099e26bd 1073
5eb91c98
DG		 1074 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1075 if (ret < 0) {
1076 goto error;
1077 }
099e26bd 1078
5eb91c98
DG		 1079 while (1) {
1080 /* Zeroed the events structure */
1081 lttng_poll_reset(&events);
0177d773 1082
5eb91c98 1083 nb_fd = LTTNG_POLL_GETNB(&events);
099e26bd
DG		 1084
1085 DBG("Apps thread polling on %d fds", nb_fd);
1086
1087 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1088 ret = lttng_poll_wait(&events, -1);
099e26bd 1089 if (ret < 0) {
099e26bd
DG		 1090 goto error;
1091 }
1092
5eb91c98
DG		 1093 for (i = 0; i < nb_fd; i++) {
1094 /* Fetch once the poll data */
1095 revents = LTTNG_POLL_GETEV(&events, i);
1096 pollfd = LTTNG_POLL_GETFD(&events, i);
1097
1098 /* Thread quit pipe has been closed. Killing thread. */
1099 ret = check_thread_quit_pipe(pollfd, revents);
1100 if (ret) {
099e26bd 1101 goto error;
5eb91c98 1102 }
099e26bd 1103
5eb91c98
DG		 1104 /* Inspect the apps cmd pipe */
1105 if (pollfd == apps_cmd_pipe[0]) {
1106 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1107 ERR("Apps command pipe error");
0177d773 1108 goto error;
5eb91c98
DG		 1109 } else if (revents & LPOLLIN) {
1110 /* Empty pipe */
1111 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1112 if (ret < 0 || ret < sizeof(ust_cmd)) {
1113 perror("read apps cmd pipe");
1114 goto error;
1115 }
099e26bd 1116
5eb91c98 1117 /* Register applicaton to the session daemon */
56fff090 1118 ret = ust_app_register(&ust_cmd.reg_msg,
54d01ffb 1119 ust_cmd.sock);
88ff5b7f 1120 if (ret == -ENOMEM) {
5eb91c98 1121 goto error;
88ff5b7f
MD		 1122 } else if (ret < 0) {
1123 break;
5eb91c98
DG		 1124 }
1125
acc7b41b 1126 /*
e0c7ec2b 1127 * Validate UST version compatibility.
acc7b41b 1128 */
e0c7ec2b
DG		 1129 ret = ust_app_validate_version(ust_cmd.sock);
1130 if (ret >= 0) {
1131 /*
1132 * Add channel(s) and event(s) to newly registered apps
1133 * from lttng global UST domain.
1134 */
1135 update_ust_app(ust_cmd.sock);
1136 }
acc7b41b 1137
f2ca2e25 1138 ret = ust_app_register_done(ust_cmd.sock);
5eb91c98
DG		 1139 if (ret < 0) {
1140 /*
1141 * If the registration is not possible, we simply
1142 * unregister the apps and continue
1143 */
56fff090 1144 ust_app_unregister(ust_cmd.sock);
5eb91c98
DG		 1145 } else {
1146 /*
1147 * We just need here to monitor the close of the UST
1148 * socket and poll set monitor those by default.
1149 */
1150 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1151 if (ret < 0) {
1152 goto error;
1153 }
1154
54d01ffb
DG		 1155 DBG("Apps with sock %d added to poll set",
1156 ust_cmd.sock);
5eb91c98 1157 }
487cf67c 1158
5eb91c98 1159 break;
0177d773 1160 }
5eb91c98
DG		 1161 } else {
1162 /*
54d01ffb
DG		 1163 * At this point, we know that a registered application made
1164 * the event at poll_wait.
5eb91c98
DG		 1165 */
1166 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1167 /* Removing from the poll set */
1168 ret = lttng_poll_del(&events, pollfd);
1169 if (ret < 0) {
1170 goto error;
1171 }
099e26bd 1172
b9d9b220 1173 /* Socket closed on remote end. */
56fff090 1174 ust_app_unregister(pollfd);
5eb91c98
DG		 1175 break;
1176 }
099e26bd
DG		 1177 }
1178 }
099e26bd
DG		 1179 }
1180
1181error:
1182 DBG("Application communication apps dying");
1183 close(apps_cmd_pipe[0]);
1184 close(apps_cmd_pipe[1]);
1185
5eb91c98 1186 lttng_poll_clean(&events);
099e26bd 1187
f6a9efaa
DG		 1188 rcu_thread_offline();
1189 rcu_unregister_thread();
099e26bd
DG		 1190 return NULL;
1191}
1192
1193/*
1194 * Dispatch request from the registration threads to the application
1195 * communication thread.
1196 */
1197static void *thread_dispatch_ust_registration(void *data)
1198{
1199 int ret;
1200 struct cds_wfq_node *node;
1201 struct ust_command *ust_cmd = NULL;
1202
1203 DBG("[thread] Dispatch UST command started");
1204
1205 while (!dispatch_thread_exit) {
1206 /* Atomically prepare the queue futex */
1207 futex_nto1_prepare(&ust_cmd_queue.futex);
1208
1209 do {
1210 /* Dequeue command for registration */
1211 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1212 if (node == NULL) {
00a17c97 1213 DBG("Woken up but nothing in the UST command queue");
099e26bd
DG		 1214 /* Continue thread execution */
1215 break;
1216 }
1217
1218 ust_cmd = caa_container_of(node, struct ust_command, node);
1219
2f50c8a3
DG		 1220 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1221 " gid:%d sock:%d name:%s (version %d.%d)",
1222 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1223 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1224 ust_cmd->sock, ust_cmd->reg_msg.name,
1225 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
099e26bd
DG		 1226 /*
1227 * Inform apps thread of the new application registration. This
1228 * call is blocking so we can be assured that the data will be read
1229 * at some point in time or wait to the end of the world :)
1230 */
1231 ret = write(apps_cmd_pipe[1], ust_cmd,
1232 sizeof(struct ust_command));
1233 if (ret < 0) {
1234 perror("write apps cmd pipe");
1235 if (errno == EBADF) {
1236 /*
1237 * We can't inform the application thread to process
1238 * registration. We will exit or else application
1239 * registration will not occur and tracing will never
1240 * start.
1241 */
1242 goto error;
1243 }
1244 }
1245 free(ust_cmd);
1246 } while (node != NULL);
1247
1248 /* Futex wait on queue. Blocking call on futex() */
1249 futex_nto1_wait(&ust_cmd_queue.futex);
1250 }
1251
1252error:
1253 DBG("Dispatch thread dying");
1254 return NULL;
1255}
1256
1257/*
1258 * This thread manage application registration.
1259 */
1260static void *thread_registration_apps(void *data)
1d4b027a 1261{
5eb91c98
DG		 1262 int sock = 0, i, ret, pollfd;
1263 uint32_t revents, nb_fd;
1264 struct lttng_poll_event events;
099e26bd
DG		 1265 /*
1266 * Get allocated in this thread, enqueued to a global queue, dequeued and
1267 * freed in the manage apps thread.
1268 */
1269 struct ust_command *ust_cmd = NULL;
1d4b027a 1270
099e26bd 1271 DBG("[thread] Manage application registration started");
1d4b027a
DG		 1272
1273 ret = lttcomm_listen_unix_sock(apps_sock);
1274 if (ret < 0) {
1275 goto error;
1276 }
1277
5eb91c98
DG		 1278 /*
1279 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1280 * more will be added to this poll set.
1281 */
1282 ret = create_thread_poll_set(&events, 2);
1283 if (ret < 0) {
1284 goto error;
1285 }
273ea72c 1286
5eb91c98
DG		 1287 /* Add the application registration socket */
1288 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1289 if (ret < 0) {
1290 goto error;
1291 }
273ea72c 1292
1d4b027a 1293 /* Notify all applications to register */
0fdd1e2c
DG		 1294 ret = notify_ust_apps(1);
1295 if (ret < 0) {
1296 ERR("Failed to notify applications or create the wait shared memory.\n"
54d01ffb
DG		 1297 "Execution continues but there might be problem for already\n"
1298 "running applications that wishes to register.");
0fdd1e2c 1299 }
1d4b027a
DG		 1300
1301 while (1) {
1302 DBG("Accepting application registration");
273ea72c 1303
5eb91c98
DG		 1304 nb_fd = LTTNG_POLL_GETNB(&events);
1305
273ea72c 1306 /* Inifinite blocking call, waiting for transmission */
5eb91c98 1307 ret = lttng_poll_wait(&events, -1);
273ea72c 1308 if (ret < 0) {
273ea72c
DG		 1309 goto error;
1310 }
1311
5eb91c98
DG		 1312 for (i = 0; i < nb_fd; i++) {
1313 /* Fetch once the poll data */
1314 revents = LTTNG_POLL_GETEV(&events, i);
1315 pollfd = LTTNG_POLL_GETFD(&events, i);
273ea72c 1316
5eb91c98
DG		 1317 /* Thread quit pipe has been closed. Killing thread. */
1318 ret = check_thread_quit_pipe(pollfd, revents);
1319 if (ret) {
90014c57
DG		 1320 goto error;
1321 }
1d4b027a 1322
5eb91c98
DG		 1323 /* Event on the registration socket */
1324 if (pollfd == apps_sock) {
1325 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1326 ERR("Register apps socket poll error");
1327 goto error;
1328 } else if (revents & LPOLLIN) {
1329 sock = lttcomm_accept_unix_sock(apps_sock);
1330 if (sock < 0) {
1331 goto error;
1332 }
099e26bd 1333
5eb91c98 1334 /* Create UST registration command for enqueuing */
ba7f0ae5 1335 ust_cmd = zmalloc(sizeof(struct ust_command));
5eb91c98 1336 if (ust_cmd == NULL) {
ba7f0ae5 1337 perror("ust command zmalloc");
5eb91c98
DG		 1338 goto error;
1339 }
1d4b027a 1340
5eb91c98
DG		 1341 /*
1342 * Using message-based transmissions to ensure we don't
1343 * have to deal with partially received messages.
1344 */
1345 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1346 sizeof(struct ust_register_msg));
1347 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1348 if (ret < 0) {
1349 perror("lttcomm_recv_unix_sock register apps");
1350 } else {
1351 ERR("Wrong size received on apps register");
1352 }
1353 free(ust_cmd);
1354 close(sock);
1355 continue;
1356 }
099e26bd 1357
5eb91c98 1358 ust_cmd->sock = sock;
099e26bd 1359
5eb91c98
DG		 1360 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1361 " gid:%d sock:%d name:%s (version %d.%d)",
1362 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1363 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1364 ust_cmd->sock, ust_cmd->reg_msg.name,
1365 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
54d01ffb 1366
5eb91c98
DG		 1367 /*
1368 * Lock free enqueue the registration request. The red pill
54d01ffb 1369 * has been taken! This apps will be part of the *system*.
5eb91c98
DG		 1370 */
1371 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1372
1373 /*
1374 * Wake the registration queue futex. Implicit memory
1375 * barrier with the exchange in cds_wfq_enqueue.
1376 */
1377 futex_nto1_wake(&ust_cmd_queue.futex);
1378 }
1379 }
90014c57 1380 }
1d4b027a
DG		 1381 }
1382
1383error:
0fdd1e2c
DG		 1384 DBG("UST Registration thread dying");
1385
1386 /* Notify that the registration thread is gone */
1387 notify_ust_apps(0);
1388
1389 close(apps_sock);
1390 close(sock);
273ea72c 1391 unlink(apps_unix_sock_path);
0fdd1e2c 1392
5eb91c98
DG		 1393 lttng_poll_clean(&events);
1394
1d4b027a
DG		 1395 return NULL;
1396}
1397
8c0faa1d 1398/*
3bd1e081 1399 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
d063d709 1400 * exec or it will fails.
8c0faa1d 1401 */
3bd1e081 1402static int spawn_consumer_thread(struct consumer_data *consumer_data)
8c0faa1d
DG		 1403{
1404 int ret;
ee0b0061
DG		 1405 struct timespec timeout;
1406
1407 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1408 timeout.tv_nsec = 0;
8c0faa1d
DG		 1409
1410 /* Setup semaphore */
3bd1e081 1411 ret = sem_init(&consumer_data->sem, 0, 0);
ee0b0061 1412 if (ret < 0) {
3bd1e081 1413 PERROR("sem_init consumer semaphore");
ee0b0061
DG		 1414 goto error;
1415 }
8c0faa1d 1416
3bd1e081
MD		 1417 ret = pthread_create(&consumer_data->thread, NULL,
1418 thread_manage_consumer, consumer_data);
8c0faa1d 1419 if (ret != 0) {
3bd1e081 1420 PERROR("pthread_create consumer");
ee0b0061 1421 ret = -1;
8c0faa1d
DG		 1422 goto error;
1423 }
1424
ee0b0061
DG		 1425 /* Get time for sem_timedwait absolute timeout */
1426 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1427 if (ret < 0) {
3bd1e081 1428 PERROR("clock_gettime spawn consumer");
ee0b0061 1429 /* Infinite wait for the kconsumerd thread to be ready */
3bd1e081 1430 ret = sem_wait(&consumer_data->sem);
ee0b0061
DG		 1431 } else {
1432 /* Normal timeout if the gettime was successful */
1433 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
3bd1e081 1434 ret = sem_timedwait(&consumer_data->sem, &timeout);
ee0b0061 1435 }
8c0faa1d 1436
ee0b0061
DG		 1437 if (ret < 0) {
1438 if (errno == ETIMEDOUT) {
1439 /*
1440 * Call has timed out so we kill the kconsumerd_thread and return
1441 * an error.
1442 */
3bd1e081
MD		 1443 ERR("The consumer thread was never ready. Killing it");
1444 ret = pthread_cancel(consumer_data->thread);
ee0b0061 1445 if (ret < 0) {
3bd1e081 1446 PERROR("pthread_cancel consumer thread");
ee0b0061
DG		 1447 }
1448 } else {
3bd1e081 1449 PERROR("semaphore wait failed consumer thread");
ee0b0061
DG		 1450 }
1451 goto error;
1452 }
1453
3bd1e081
MD		 1454 pthread_mutex_lock(&consumer_data->pid_mutex);
1455 if (consumer_data->pid == 0) {
712ea556 1456 ERR("Kconsumerd did not start");
3bd1e081 1457 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556
DG		 1458 goto error;
1459 }
3bd1e081 1460 pthread_mutex_unlock(&consumer_data->pid_mutex);
712ea556 1461
8c0faa1d
DG		 1462 return 0;
1463
1464error:
1465 return ret;
1466}
1467
d9800920 1468/*
3bd1e081 1469 * Join consumer thread
d9800920 1470 */
3bd1e081 1471static int join_consumer_thread(struct consumer_data *consumer_data)
cf3af59e
MD		 1472{
1473 void *status;
1474 int ret;
1475
3bd1e081
MD		 1476 if (consumer_data->pid != 0) {
1477 ret = kill(consumer_data->pid, SIGTERM);
cf3af59e 1478 if (ret) {
3bd1e081 1479 ERR("Error killing consumer daemon");
cf3af59e
MD		 1480 return ret;
1481 }
3bd1e081 1482 return pthread_join(consumer_data->thread, &status);
cf3af59e
MD		 1483 } else {
1484 return 0;
1485 }
1486}
1487
8c0faa1d 1488/*
3bd1e081 1489 * Fork and exec a consumer daemon (consumerd).
8c0faa1d 1490 *
d063d709 1491 * Return pid if successful else -1.
8c0faa1d 1492 */
3bd1e081 1493static pid_t spawn_consumerd(struct consumer_data *consumer_data)
8c0faa1d
DG		 1494{
1495 int ret;
1496 pid_t pid;
94c55f17 1497 const char *consumer_to_use;
53086306 1498 const char *verbosity;
94c55f17 1499 struct stat st;
8c0faa1d 1500
3bd1e081 1501 DBG("Spawning consumerd");
c49dc785 1502
8c0faa1d
DG		 1503 pid = fork();
1504 if (pid == 0) {
1505 /*
3bd1e081 1506 * Exec consumerd.
8c0faa1d 1507 */
daee5345 1508 if (opt_verbose_consumer) {
53086306
DG		 1509 verbosity = "--verbose";
1510 } else {
1511 verbosity = "--quiet";
1512 }
3bd1e081
MD		 1513 switch (consumer_data->type) {
1514 case LTTNG_CONSUMER_KERNEL:
94c55f17 1515 /*
c7704d57
DG		 1516 * Find out which consumerd to execute. We will first try the
1517 * 64-bit path, then the sessiond's installation directory, and
1518 * fallback on the 32-bit one,
94c55f17 1519 */
63a799e8
AM		 1520 DBG3("Looking for a kernel consumer at these locations:");
1521 DBG3(" 1) %s", consumerd64_bin);
1522 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1523 DBG3(" 3) %s", consumerd32_bin);
94c55f17 1524 if (stat(consumerd64_bin, &st) == 0) {
63a799e8 1525 DBG3("Found location #1");
94c55f17 1526 consumer_to_use = consumerd64_bin;
94c55f17 1527 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
63a799e8 1528 DBG3("Found location #2");
94c55f17 1529 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
eb1e0bd4 1530 } else if (stat(consumerd32_bin, &st) == 0) {
63a799e8 1531 DBG3("Found location #3");
eb1e0bd4 1532 consumer_to_use = consumerd32_bin;
94c55f17 1533 } else {
63a799e8 1534 DBG("Could not find any valid consumerd executable");
94c55f17
AM		 1535 break;
1536 }
1537 DBG("Using kernel consumer at: %s", consumer_to_use);
1538 execl(consumer_to_use,
1539 "lttng-consumerd", verbosity, "-k",
1540 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1541 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1542 NULL);
3bd1e081 1543 break;
7753dea8
MD		 1544 case LTTNG_CONSUMER64_UST:
1545 {
b1e0b6b6 1546 char *tmpnew = NULL;
8f4905da
MD		 1547
1548 if (consumerd64_libdir[0] != '\0') {
1549 char *tmp;
1550 size_t tmplen;
1551
1552 tmp = getenv("LD_LIBRARY_PATH");
1553 if (!tmp) {
1554 tmp = "";
1555 }
1556 tmplen = strlen("LD_LIBRARY_PATH=")
1557 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1558 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1559 if (!tmpnew) {
1560 ret = -ENOMEM;
1561 goto error;
1562 }
1563 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1564 strcat(tmpnew, consumerd64_libdir);
1565 if (tmp[0] != '\0') {
1566 strcat(tmpnew, ":");
1567 strcat(tmpnew, tmp);
1568 }
1569 ret = putenv(tmpnew);
1570 if (ret) {
1571 ret = -errno;
1572 goto error;
1573 }
1574 }
94c55f17 1575 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
a5a6aff3 1576 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1577 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1578 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1579 NULL);
8f4905da
MD		 1580 if (consumerd64_libdir[0] != '\0') {
1581 free(tmpnew);
1582 }
1583 if (ret) {
1584 goto error;
1585 }
3bd1e081 1586 break;
7753dea8
MD		 1587 }
1588 case LTTNG_CONSUMER32_UST:
1589 {
937dde8e 1590 char *tmpnew = NULL;
8f4905da
MD		 1591
1592 if (consumerd32_libdir[0] != '\0') {
1593 char *tmp;
1594 size_t tmplen;
1595
1596 tmp = getenv("LD_LIBRARY_PATH");
1597 if (!tmp) {
1598 tmp = "";
1599 }
1600 tmplen = strlen("LD_LIBRARY_PATH=")
1601 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1602 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1603 if (!tmpnew) {
1604 ret = -ENOMEM;
1605 goto error;
1606 }
1607 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1608 strcat(tmpnew, consumerd32_libdir);
1609 if (tmp[0] != '\0') {
1610 strcat(tmpnew, ":");
1611 strcat(tmpnew, tmp);
1612 }
1613 ret = putenv(tmpnew);
1614 if (ret) {
1615 ret = -errno;
1616 goto error;
1617 }
1618 }
94c55f17 1619 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
a5a6aff3 1620 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
7753dea8
MD		 1621 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1622 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1623 NULL);
8f4905da
MD		 1624 if (consumerd32_libdir[0] != '\0') {
1625 free(tmpnew);
1626 }
1627 if (ret) {
1628 goto error;
1629 }
7753dea8
MD		 1630 break;
1631 }
3bd1e081
MD		 1632 default:
1633 perror("unknown consumer type");
1634 exit(EXIT_FAILURE);
1635 }
8c0faa1d
DG		 1636 if (errno != 0) {
1637 perror("kernel start consumer exec");
1638 }
1639 exit(EXIT_FAILURE);
1640 } else if (pid > 0) {
1641 ret = pid;
8c0faa1d 1642 } else {
3bd1e081 1643 perror("start consumer fork");
8c0faa1d 1644 ret = -errno;
8c0faa1d 1645 }
8f4905da 1646error:
8c0faa1d
DG		 1647 return ret;
1648}
1649
693bd40b 1650/*
3bd1e081 1651 * Spawn the consumerd daemon and session daemon thread.
693bd40b 1652 */
3bd1e081 1653static int start_consumerd(struct consumer_data *consumer_data)
693bd40b
DG		 1654{
1655 int ret;
1656
3bd1e081
MD		 1657 pthread_mutex_lock(&consumer_data->pid_mutex);
1658 if (consumer_data->pid != 0) {
1659 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785
DG		 1660 goto end;
1661 }
693bd40b 1662
3bd1e081 1663 ret = spawn_consumerd(consumer_data);
c49dc785 1664 if (ret < 0) {
3bd1e081
MD		 1665 ERR("Spawning consumerd failed");
1666 pthread_mutex_unlock(&consumer_data->pid_mutex);
c49dc785 1667 goto error;
693bd40b 1668 }
c49dc785 1669
3bd1e081
MD		 1670 /* Setting up the consumer_data pid */
1671 consumer_data->pid = ret;
48842b30 1672 DBG2("Consumer pid %d", consumer_data->pid);
3bd1e081 1673 pthread_mutex_unlock(&consumer_data->pid_mutex);
693bd40b 1674
3bd1e081
MD		 1675 DBG2("Spawning consumer control thread");
1676 ret = spawn_consumer_thread(consumer_data);
693bd40b 1677 if (ret < 0) {
3bd1e081 1678 ERR("Fatal error spawning consumer control thread");
693bd40b
DG		 1679 goto error;
1680 }
1681
c49dc785 1682end:
693bd40b
DG		 1683 return 0;
1684
1685error:
1686 return ret;
1687}
1688
b73401da 1689/*
096102bd 1690 * Check version of the lttng-modules.
b73401da 1691 */
096102bd 1692static int validate_lttng_modules_version(void)
b73401da 1693{
096102bd 1694 return kernel_validate_version(kernel_tracer_fd);
ab147185
MD		 1695}
1696
b73401da 1697/*
096102bd 1698 * Setup necessary data for kernel tracer action.
b73401da 1699 */
096102bd 1700static int init_kernel_tracer(void)
b73401da
DG		 1701{
1702 int ret;
b73401da 1703
096102bd
DG		 1704 /* Modprobe lttng kernel modules */
1705 ret = modprobe_lttng_control();
b73401da 1706 if (ret < 0) {
b73401da
DG		 1707 goto error;
1708 }
1709
096102bd
DG		 1710 /* Open debugfs lttng */
1711 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1712 if (kernel_tracer_fd < 0) {
1713 DBG("Failed to open %s", module_proc_lttng);
1714 ret = -1;
1715 goto error_open;
b73401da
DG		 1716 }
1717
096102bd
DG		 1718 /* Validate kernel version */
1719 ret = validate_lttng_modules_version();
b73401da 1720 if (ret < 0) {
096102bd 1721 goto error_version;
b73401da
DG		 1722 }
1723
096102bd 1724 ret = modprobe_lttng_data();
b73401da 1725 if (ret < 0) {
096102bd 1726 goto error_modules;
8c0faa1d
DG		 1727 }
1728
f3ed775e 1729 DBG("Kernel tracer fd %d", kernel_tracer_fd);
096102bd
DG		 1730 return 0;
1731
1732error_version:
1733 modprobe_remove_lttng_control();
1734 close(kernel_tracer_fd);
1735 kernel_tracer_fd = 0;
1736 return LTTCOMM_KERN_VERSION;
1737
1738error_modules:
1739 close(kernel_tracer_fd);
1740
1741error_open:
1742 modprobe_remove_lttng_control();
b73401da
DG		 1743
1744error:
b73401da
DG		 1745 WARN("No kernel tracer available");
1746 kernel_tracer_fd = 0;
096102bd 1747 return LTTCOMM_KERN_NA;
f3ed775e 1748}
33a2b854 1749
f3ed775e 1750/*
54d01ffb 1751 * Init tracing by creating trace directory and sending fds kernel consumer.
f3ed775e 1752 */
54d01ffb 1753static int init_kernel_tracing(struct ltt_kernel_session *session)
f3ed775e 1754{
f40799e8 1755 int ret = 0;
8c0faa1d 1756
3bd1e081 1757 if (session->consumer_fds_sent == 0) {
d9800920 1758 /*
54d01ffb
DG		 1759 * Assign default kernel consumer socket if no consumer assigned to the
1760 * kernel session. At this point, it's NOT suppose to be 0 but this is
1761 * an extra security check.
d9800920
DG		 1762 */
1763 if (session->consumer_fd == 0) {
3bd1e081 1764 session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1765 }
1766
2bdd86d4 1767 ret = send_kconsumer_session_streams(&kconsumer_data, session);
f3ed775e 1768 if (ret < 0) {
f3ed775e
DG		 1769 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1770 goto error;
1771 }
1d4b027a 1772
3bd1e081 1773 session->consumer_fds_sent = 1;
f3ed775e 1774 }
1d4b027a
DG		 1775
1776error:
1777 return ret;
8c0faa1d
DG		 1778}
1779
0177d773
DG		 1780/*
1781 * Create an UST session and add it to the session ust list.
1782 */
44d3bd01 1783static int create_ust_session(struct ltt_session *session,
6df2e2c9 1784 struct lttng_domain *domain)
0177d773 1785{
13384287 1786 struct ltt_ust_session *lus = NULL;
6df2e2c9 1787 int ret;
44d3bd01
DG		 1788
1789 switch (domain->type) {
48842b30 1790 case LTTNG_DOMAIN_UST:
44d3bd01
DG		 1791 break;
1792 default:
13384287 1793 ret = LTTCOMM_UNKNOWN_DOMAIN;
44d3bd01
DG		 1794 goto error;
1795 }
0177d773
DG		 1796
1797 DBG("Creating UST session");
1798
a991f516 1799 lus = trace_ust_create_session(session->path, session->id, domain);
0177d773 1800 if (lus == NULL) {
44d3bd01 1801 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1802 goto error;
1803 }
1804
e11d277b 1805 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
6df2e2c9 1806 session->uid, session->gid);
0177d773
DG		 1807 if (ret < 0) {
1808 if (ret != -EEXIST) {
1809 ERR("Trace directory creation error");
44d3bd01 1810 ret = LTTCOMM_UST_SESS_FAIL;
0177d773
DG		 1811 goto error;
1812 }
1813 }
1814
f6a9efaa
DG		 1815 /* The domain type dictate different actions on session creation */
1816 switch (domain->type) {
48842b30
DG		 1817 case LTTNG_DOMAIN_UST:
1818 /* No ustctl for the global UST domain */
1819 break;
1820 default:
36dc12cc 1821 ERR("Unknown UST domain on create session %d", domain->type);
48842b30 1822 goto error;
0177d773 1823 }
6df2e2c9
MD		 1824 lus->uid = session->uid;
1825 lus->gid = session->gid;
f6a9efaa 1826 session->ust_session = lus;
44d3bd01
DG		 1827
1828 return LTTCOMM_OK;
0177d773
DG		 1829
1830error:
1831 free(lus);
1832 return ret;
1833}
1834
333f285e 1835/*
d063d709 1836 * Create a kernel tracer session then create the default channel.
333f285e 1837 */
6df2e2c9 1838static int create_kernel_session(struct ltt_session *session)
333f285e 1839{
f3ed775e 1840 int ret;
f3ed775e
DG		 1841
1842 DBG("Creating kernel session");
1843
1844 ret = kernel_create_session(session, kernel_tracer_fd);
1845 if (ret < 0) {
1846 ret = LTTCOMM_KERN_SESS_FAIL;
1847 goto error;
333f285e
DG		 1848 }
1849
d9800920 1850 /* Set kernel consumer socket fd */
3bd1e081
MD		 1851 if (kconsumer_data.cmd_sock) {
1852 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
d9800920
DG		 1853 }
1854
e11d277b 1855 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
6df2e2c9 1856 S_IRWXU | S_IRWXG, session->uid, session->gid);
7a485870 1857 if (ret < 0) {
996b65c8 1858 if (ret != -EEXIST) {
7a485870
DG		 1859 ERR("Trace directory creation error");
1860 goto error;
1861 }
1862 }
6df2e2c9
MD		 1863 session->kernel_session->uid = session->uid;
1864 session->kernel_session->gid = session->gid;
7a485870 1865
f3ed775e
DG		 1866error:
1867 return ret;
333f285e
DG		 1868}
1869
8e0af1b4 1870/*
c7704d57
DG		 1871 * Check if the UID or GID match the session. Root user has access to all
1872 * sessions.
8e0af1b4 1873 */
c7704d57 1874static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
8e0af1b4 1875{
c7704d57 1876 if (uid != session->uid && gid != session->gid && uid != 0) {
8e0af1b4
MD		 1877 return 0;
1878 } else {
1879 return 1;
1880 }
1881}
1882
1883static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1884{
1885 unsigned int i = 0;
1886 struct ltt_session *session;
1887
1888 DBG("Counting number of available session for UID %d GID %d",
1889 uid, gid);
1890 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1891 /*
1892 * Only list the sessions the user can control.
1893 */
1894 if (!session_access_ok(session, uid, gid)) {
1895 continue;
1896 }
1897 i++;
1898 }
1899 return i;
1900}
1901
6c9cc2ab
DG		 1902/*
1903 * Using the session list, filled a lttng_session array to send back to the
1904 * client for session listing.
1905 *
1906 * The session list lock MUST be acquired before calling this function. Use
54d01ffb 1907 * session_lock_list() and session_unlock_list().
6c9cc2ab 1908 */
c7704d57
DG		 1909static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1910 gid_t gid)
6c9cc2ab 1911{
8e0af1b4 1912 unsigned int i = 0;
6c9cc2ab
DG		 1913 struct ltt_session *session;
1914
8e0af1b4
MD		 1915 DBG("Getting all available session for UID %d GID %d",
1916 uid, gid);
6c9cc2ab
DG		 1917 /*
1918 * Iterate over session list and append data after the control struct in
1919 * the buffer.
1920 */
1921 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
8e0af1b4
MD		 1922 /*
1923 * Only list the sessions the user can control.
1924 */
1925 if (!session_access_ok(session, uid, gid)) {
1926 continue;
1927 }
6c9cc2ab 1928 strncpy(sessions[i].path, session->path, PATH_MAX);
99497cd0 1929 sessions[i].path[PATH_MAX - 1] = '\0';
6c9cc2ab 1930 strncpy(sessions[i].name, session->name, NAME_MAX);
99497cd0 1931 sessions[i].name[NAME_MAX - 1] = '\0';
464dd62d 1932 sessions[i].enabled = session->enabled;
6c9cc2ab
DG		 1933 i++;
1934 }
1935}
1936
9f19cc17
DG		 1937/*
1938 * Fill lttng_channel array of all channels.
1939 */
b551a063 1940static void list_lttng_channels(int domain, struct ltt_session *session,
9f19cc17
DG		 1941 struct lttng_channel *channels)
1942{
1943 int i = 0;
1944 struct ltt_kernel_channel *kchan;
1945
1946 DBG("Listing channels for session %s", session->name);
1947
b551a063
DG		 1948 switch (domain) {
1949 case LTTNG_DOMAIN_KERNEL:
1950 /* Kernel channels */
1951 if (session->kernel_session != NULL) {
1952 cds_list_for_each_entry(kchan,
1953 &session->kernel_session->channel_list.head, list) {
1954 /* Copy lttng_channel struct to array */
1955 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1956 channels[i].enabled = kchan->enabled;
1957 i++;
1958 }
1959 }
1960 break;
1961 case LTTNG_DOMAIN_UST:
1962 {
bec39940 1963 struct lttng_ht_iter iter;
b551a063
DG		 1964 struct ltt_ust_channel *uchan;
1965
bec39940
DG		 1966 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1967 &iter.iter, uchan, node.node) {
b551a063
DG		 1968 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1969 channels[i].attr.overwrite = uchan->attr.overwrite;
1970 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1971 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1972 channels[i].attr.switch_timer_interval =
1973 uchan->attr.switch_timer_interval;
1974 channels[i].attr.read_timer_interval =
1975 uchan->attr.read_timer_interval;
aea829b3 1976 channels[i].enabled = uchan->enabled;
5edd7e09
DG		 1977 switch (uchan->attr.output) {
1978 case LTTNG_UST_MMAP:
1979 default:
1980 channels[i].attr.output = LTTNG_EVENT_MMAP;
1981 break;
1982 }
befe0905 1983 i++;
b551a063
DG		 1984 }
1985 break;
1986 }
1987 default:
1988 break;
1989 }
1990}
1991
1992/*
1993 * Create a list of ust global domain events.
1994 */
1995static int list_lttng_ust_global_events(char *channel_name,
1996 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1997{
1998 int i = 0, ret = 0;
1999 unsigned int nb_event = 0;
bec39940
DG		 2000 struct lttng_ht_iter iter;
2001 struct lttng_ht_node_str *node;
b551a063
DG		 2002 struct ltt_ust_channel *uchan;
2003 struct ltt_ust_event *uevent;
2004 struct lttng_event *tmp;
2005
2006 DBG("Listing UST global events for channel %s", channel_name);
2007
2008 rcu_read_lock();
2009
bec39940
DG		 2010 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2011 node = lttng_ht_iter_get_node_str(&iter);
d7b75b30
DG		 2012 if (node == NULL) {
2013 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2014 goto error;
b551a063
DG		 2015 }
2016
bec39940 2017 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
d7b75b30 2018
bec39940 2019 nb_event += lttng_ht_get_count(uchan->events);
d7b75b30 2020
b551a063
DG		 2021 if (nb_event == 0) {
2022 ret = nb_event;
2023 goto error;
2024 }
2025
2026 DBG3("Listing UST global %d events", nb_event);
2027
2028 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2029 if (tmp == NULL) {
2030 ret = -LTTCOMM_FATAL;
2031 goto error;
2032 }
2033
bec39940 2034 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
d7b75b30
DG		 2035 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2036 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2037 tmp[i].enabled = uevent->enabled;
2038 switch (uevent->attr.instrumentation) {
2039 case LTTNG_UST_TRACEPOINT:
2040 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2041 break;
2042 case LTTNG_UST_PROBE:
2043 tmp[i].type = LTTNG_EVENT_PROBE;
2044 break;
2045 case LTTNG_UST_FUNCTION:
2046 tmp[i].type = LTTNG_EVENT_FUNCTION;
2047 break;
0cda4f28 2048 }
8005f29a 2049 tmp[i].loglevel = uevent->attr.loglevel;
0cda4f28 2050 switch (uevent->attr.loglevel_type) {
8005f29a 2051 case LTTNG_UST_LOGLEVEL_ALL:
22e25b71 2052 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
0cda4f28 2053 break;
8005f29a 2054 case LTTNG_UST_LOGLEVEL_RANGE:
22e25b71 2055 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
8005f29a
MD		 2056 break;
2057 case LTTNG_UST_LOGLEVEL_SINGLE:
22e25b71 2058 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
ac3bd9c0 2059 break;
9f19cc17 2060 }
d7b75b30 2061 i++;
9f19cc17
DG		 2062 }
2063
b551a063
DG		 2064 ret = nb_event;
2065 *events = tmp;
2066
2067error:
2068 rcu_read_unlock();
2069 return ret;
9f19cc17
DG		 2070}
2071
2072/*
b551a063 2073 * Fill lttng_event array of all kernel events in the channel.
9f19cc17 2074 */
b551a063
DG		 2075static int list_lttng_kernel_events(char *channel_name,
2076 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
9f19cc17 2077{
b551a063
DG		 2078 int i = 0, ret;
2079 unsigned int nb_event;
9f19cc17 2080 struct ltt_kernel_event *event;
b551a063
DG		 2081 struct ltt_kernel_channel *kchan;
2082
2083 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2084 if (kchan == NULL) {
2085 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2086 goto error;
2087 }
2088
2089 nb_event = kchan->event_count;
9f19cc17
DG		 2090
2091 DBG("Listing events for channel %s", kchan->channel->name);
2092
b551a063
DG		 2093 if (nb_event == 0) {
2094 ret = nb_event;
2095 goto error;
2096 }
2097
2098 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2099 if (*events == NULL) {
2100 ret = LTTCOMM_FATAL;
2101 goto error;
2102 }
2103
9f19cc17
DG		 2104 /* Kernel channels */
2105 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
b551a063
DG		 2106 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2107 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2108 (*events)[i].enabled = event->enabled;
9f19cc17
DG		 2109 switch (event->event->instrumentation) {
2110 case LTTNG_KERNEL_TRACEPOINT:
b551a063 2111 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
9f19cc17
DG		 2112 break;
2113 case LTTNG_KERNEL_KPROBE:
2114 case LTTNG_KERNEL_KRETPROBE:
b551a063
DG		 2115 (*events)[i].type = LTTNG_EVENT_PROBE;
2116 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
9f19cc17
DG		 2117 sizeof(struct lttng_kernel_kprobe));
2118 break;
2119 case LTTNG_KERNEL_FUNCTION:
b551a063
DG		 2120 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2121 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
9f19cc17
DG		 2122 sizeof(struct lttng_kernel_function));
2123 break;
0133c199 2124 case LTTNG_KERNEL_NOOP:
b551a063 2125 (*events)[i].type = LTTNG_EVENT_NOOP;
0133c199 2126 break;
a54bd42d 2127 case LTTNG_KERNEL_SYSCALL:
b551a063 2128 (*events)[i].type = LTTNG_EVENT_SYSCALL;
0133c199 2129 break;
7a3d1328
MD		 2130 case LTTNG_KERNEL_ALL:
2131 assert(0);
2132 break;
9f19cc17
DG		 2133 }
2134 i++;
2135 }
b551a063
DG		 2136
2137 return nb_event;
2138
2139error:
2140 return ret;
9f19cc17
DG		 2141}
2142
fac6795d 2143/*
54d01ffb 2144 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
fac6795d 2145 */
54d01ffb
DG		 2146static int cmd_disable_channel(struct ltt_session *session,
2147 int domain, char *channel_name)
fac6795d 2148{
54d01ffb 2149 int ret;
78f0bacd
DG		 2150 struct ltt_ust_session *usess;
2151
2152 usess = session->ust_session;
379473d2 2153
54d01ffb 2154 switch (domain) {
78f0bacd
DG		 2155 case LTTNG_DOMAIN_KERNEL:
2156 {
2157 ret = channel_kernel_disable(session->kernel_session,
2158 channel_name);
2159 if (ret != LTTCOMM_OK) {
2160 goto error;
2161 }
54d01ffb 2162
78f0bacd
DG		 2163 kernel_wait_quiescent(kernel_tracer_fd);
2164 break;
2165 }
2166 case LTTNG_DOMAIN_UST:
2167 {
2168 struct ltt_ust_channel *uchan;
bec39940 2169 struct lttng_ht *chan_ht;
78f0bacd 2170
7885e399
DG		 2171 chan_ht = usess->domain_global.channels;
2172
2173 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
78f0bacd
DG		 2174 if (uchan == NULL) {
2175 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
54d01ffb 2176 goto error;
78f0bacd
DG		 2177 }
2178
7885e399
DG		 2179 ret = channel_ust_disable(usess, domain, uchan);
2180 if (ret != LTTCOMM_OK) {
78f0bacd
DG		 2181 goto error;
2182 }
78f0bacd
DG		 2183 break;
2184 }
d78d6610 2185#if 0
78f0bacd
DG		 2186 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2187 case LTTNG_DOMAIN_UST_EXEC_NAME:
2188 case LTTNG_DOMAIN_UST_PID:
d78d6610 2189#endif
78f0bacd
DG		 2190 default:
2191 ret = LTTCOMM_UNKNOWN_DOMAIN;
2192 goto error;
20fe2104
DG		 2193 }
2194
54d01ffb 2195 ret = LTTCOMM_OK;
d65106b1 2196
54d01ffb
DG		 2197error:
2198 return ret;
2199}
2200
2201/*
2202 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2203 */
44d3bd01 2204static int cmd_enable_channel(struct ltt_session *session,
aea829b3 2205 int domain, struct lttng_channel *attr)
54d01ffb
DG		 2206{
2207 int ret;
f6a9efaa 2208 struct ltt_ust_session *usess = session->ust_session;
bec39940 2209 struct lttng_ht *chan_ht;
f6a9efaa 2210
5d56b5aa 2211 DBG("Enabling channel %s for session %s", attr->name, session->name);
d65106b1 2212
aea829b3 2213 switch (domain) {
44d3bd01
DG		 2214 case LTTNG_DOMAIN_KERNEL:
2215 {
2216 struct ltt_kernel_channel *kchan;
54d01ffb 2217
44d3bd01
DG		 2218 kchan = trace_kernel_get_channel_by_name(attr->name,
2219 session->kernel_session);
2220 if (kchan == NULL) {
2221 ret = channel_kernel_create(session->kernel_session,
2222 attr, kernel_poll_pipe[1]);
2223 } else {
2224 ret = channel_kernel_enable(session->kernel_session, kchan);
2225 }
2226
2227 if (ret != LTTCOMM_OK) {
2228 goto error;
2229 }
2230
2231 kernel_wait_quiescent(kernel_tracer_fd);
2232 break;
2233 }
f6a9efaa
DG		 2234 case LTTNG_DOMAIN_UST:
2235 {
2236 struct ltt_ust_channel *uchan;
2237
7885e399 2238 chan_ht = usess->domain_global.channels;
f6a9efaa 2239
7885e399 2240 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
f6a9efaa 2241 if (uchan == NULL) {
7885e399 2242 ret = channel_ust_create(usess, domain, attr);
f6a9efaa 2243 } else {
7885e399 2244 ret = channel_ust_enable(usess, domain, uchan);
48842b30 2245 }
f6a9efaa
DG		 2246 break;
2247 }
d78d6610 2248#if 0
78f0bacd
DG		 2249 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2250 case LTTNG_DOMAIN_UST_EXEC_NAME:
44d3bd01 2251 case LTTNG_DOMAIN_UST_PID:
d78d6610 2252#endif
44d3bd01
DG		 2253 default:
2254 ret = LTTCOMM_UNKNOWN_DOMAIN;
2255 goto error;
54d01ffb
DG		 2256 }
2257
54d01ffb
DG		 2258error:
2259 return ret;
2260}
2261
2262/*
2263 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2264 */
2265static int cmd_disable_event(struct ltt_session *session, int domain,
2266 char *channel_name, char *event_name)
2267{
2268 int ret;
54d01ffb
DG		 2269
2270 switch (domain) {
2271 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2272 {
2273 struct ltt_kernel_channel *kchan;
b0a40d28 2274 struct ltt_kernel_session *ksess;
2bdd86d4 2275
b0a40d28
DG		 2276 ksess = session->kernel_session;
2277
2278 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2279 if (kchan == NULL) {
2280 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2281 goto error;
d65106b1
DG		 2282 }
2283
b0a40d28 2284 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
54d01ffb
DG		 2285 if (ret != LTTCOMM_OK) {
2286 goto error;
2287 }
2288
2289 kernel_wait_quiescent(kernel_tracer_fd);
d65106b1 2290 break;
2bdd86d4
MD		 2291 }
2292 case LTTNG_DOMAIN_UST:
b0a40d28 2293 {
b0a40d28 2294 struct ltt_ust_channel *uchan;
7f79d3a1 2295 struct ltt_ust_session *usess;
b0a40d28
DG		 2296
2297 usess = session->ust_session;
2298
2299 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2300 channel_name);
2301 if (uchan == NULL) {
2302 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2303 goto error;
2304 }
2305
7f79d3a1
DG		 2306 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2307 if (ret != LTTCOMM_OK) {
b0a40d28
DG		 2308 goto error;
2309 }
2310
7f79d3a1 2311 DBG3("Disable UST event %s in channel %s completed", event_name,
b0a40d28 2312 channel_name);
b0a40d28
DG		 2313 break;
2314 }
d78d6610 2315#if 0
2bdd86d4
MD		 2316 case LTTNG_DOMAIN_UST_EXEC_NAME:
2317 case LTTNG_DOMAIN_UST_PID:
2318 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2319#endif
54d01ffb 2320 default:
1ab1ea0b 2321 ret = LTTCOMM_UND;
54d01ffb 2322 goto error;
d65106b1 2323 }
26cc6b4e 2324
54d01ffb
DG		 2325 ret = LTTCOMM_OK;
2326
2327error:
2328 return ret;
2329}
2330
2331/*
2332 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2333 */
2334static int cmd_disable_event_all(struct ltt_session *session, int domain,
2335 char *channel_name)
2336{
2337 int ret;
54d01ffb
DG		 2338
2339 switch (domain) {
2340 case LTTNG_DOMAIN_KERNEL:
9730260e
DG		 2341 {
2342 struct ltt_kernel_session *ksess;
2343 struct ltt_kernel_channel *kchan;
2344
2345 ksess = session->kernel_session;
2346
2347 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
54d01ffb
DG		 2348 if (kchan == NULL) {
2349 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2350 goto error;
26cc6b4e
DG		 2351 }
2352
9730260e 2353 ret = event_kernel_disable_all(ksess, kchan);
54d01ffb 2354 if (ret != LTTCOMM_OK) {
0b97ec54 2355 goto error;
26cc6b4e
DG		 2356 }
2357
54d01ffb 2358 kernel_wait_quiescent(kernel_tracer_fd);
26cc6b4e 2359 break;
9730260e
DG		 2360 }
2361 case LTTNG_DOMAIN_UST:
2362 {
2363 struct ltt_ust_session *usess;
2364 struct ltt_ust_channel *uchan;
2365
2366 usess = session->ust_session;
2367
2368 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2369 channel_name);
2370 if (uchan == NULL) {
2371 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2372 goto error;
2373 }
2374
7f79d3a1
DG		 2375 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2376 if (ret != 0) {
9730260e
DG		 2377 goto error;
2378 }
2379
7f79d3a1 2380 DBG3("Disable all UST events in channel %s completed", channel_name);
9730260e
DG		 2381
2382 break;
2383 }
d78d6610 2384#if 0
9730260e
DG		 2385 case LTTNG_DOMAIN_UST_EXEC_NAME:
2386 case LTTNG_DOMAIN_UST_PID:
2387 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2388#endif
54d01ffb 2389 default:
1ab1ea0b 2390 ret = LTTCOMM_UND;
54d01ffb 2391 goto error;
26cc6b4e 2392 }
e953ef25 2393
54d01ffb 2394 ret = LTTCOMM_OK;
e953ef25 2395
54d01ffb
DG		 2396error:
2397 return ret;
2398}
f5177a38 2399
54d01ffb
DG		 2400/*
2401 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2402 */
2403static int cmd_add_context(struct ltt_session *session, int domain,
2404 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2405{
2406 int ret;
f5177a38 2407
54d01ffb
DG		 2408 switch (domain) {
2409 case LTTNG_DOMAIN_KERNEL:
2410 /* Add kernel context to kernel tracer */
2411 ret = context_kernel_add(session->kernel_session, ctx,
2412 event_name, channel_name);
2413 if (ret != LTTCOMM_OK) {
f5177a38 2414 goto error;
e953ef25 2415 }
2bdd86d4
MD		 2416 break;
2417 case LTTNG_DOMAIN_UST:
2418 {
55cc08a6 2419 struct ltt_ust_session *usess = session->ust_session;
e953ef25 2420
55cc08a6
DG		 2421 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2422 if (ret != LTTCOMM_OK) {
2423 goto error;
2bdd86d4 2424 }
e953ef25 2425 break;
2bdd86d4 2426 }
d78d6610 2427#if 0
55cc08a6
DG		 2428 case LTTNG_DOMAIN_UST_EXEC_NAME:
2429 case LTTNG_DOMAIN_UST_PID:
2430 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2431#endif
54d01ffb 2432 default:
1ab1ea0b 2433 ret = LTTCOMM_UND;
54d01ffb 2434 goto error;
e953ef25 2435 }
950131af 2436
54d01ffb 2437 ret = LTTCOMM_OK;
950131af 2438
54d01ffb
DG		 2439error:
2440 return ret;
2441}
2442
2443/*
2444 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2445 */
2446static int cmd_enable_event(struct ltt_session *session, int domain,
2447 char *channel_name, struct lttng_event *event)
2448{
2449 int ret;
f6cd6b0f 2450 struct lttng_channel *attr;
48842b30 2451 struct ltt_ust_session *usess = session->ust_session;
54d01ffb
DG		 2452
2453 switch (domain) {
2454 case LTTNG_DOMAIN_KERNEL:
2bdd86d4
MD		 2455 {
2456 struct ltt_kernel_channel *kchan;
2457
54d01ffb
DG		 2458 kchan = trace_kernel_get_channel_by_name(channel_name,
2459 session->kernel_session);
2460 if (kchan == NULL) {
f6cd6b0f
DG		 2461 attr = channel_new_default_attr(domain);
2462 if (attr == NULL) {
2463 ret = LTTCOMM_FATAL;
2464 goto error;
2465 }
2466 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2467
54d01ffb 2468 /* This call will notify the kernel thread */
44d3bd01 2469 ret = channel_kernel_create(session->kernel_session,
f6cd6b0f 2470 attr, kernel_poll_pipe[1]);
54d01ffb 2471 if (ret != LTTCOMM_OK) {
ff4d74e6 2472 free(attr);
f5177a38
DG		 2473 goto error;
2474 }
ff4d74e6 2475 free(attr);
54d01ffb 2476 }
950131af 2477
54d01ffb
DG		 2478 /* Get the newly created kernel channel pointer */
2479 kchan = trace_kernel_get_channel_by_name(channel_name,
2480 session->kernel_session);
2481 if (kchan == NULL) {
2482 /* This sould not happen... */
2483 ret = LTTCOMM_FATAL;
2484 goto error;
2485 }
f5177a38 2486
48842b30
DG		 2487 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2488 event);
54d01ffb 2489 if (ret != LTTCOMM_OK) {
f5177a38 2490 goto error;
950131af
DG		 2491 }
2492
54d01ffb 2493 kernel_wait_quiescent(kernel_tracer_fd);
950131af 2494 break;
2bdd86d4
MD		 2495 }
2496 case LTTNG_DOMAIN_UST:
2497 {
aea829b3 2498 struct lttng_channel *attr;
edb67388 2499 struct ltt_ust_channel *uchan;
2bdd86d4 2500
edb67388 2501 /* Get channel from global UST domain */
48842b30
DG		 2502 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2503 channel_name);
2504 if (uchan == NULL) {
aea829b3
DG		 2505 /* Create default channel */
2506 attr = channel_new_default_attr(domain);
2507 if (attr == NULL) {
2508 ret = LTTCOMM_FATAL;
2509 goto error;
2510 }
596219f7 2511 snprintf(attr->name, NAME_MAX, "%s", channel_name);
edb67388 2512 attr->name[NAME_MAX - 1] = '\0';
aea829b3 2513
7885e399 2514 ret = channel_ust_create(usess, domain, attr);
edb67388 2515 if (ret != LTTCOMM_OK) {
ff4d74e6 2516 free(attr);
aea829b3
DG		 2517 goto error;
2518 }
aea829b3
DG		 2519 free(attr);
2520
2521 /* Get the newly created channel reference back */
2522 uchan = trace_ust_find_channel_by_name(
2523 usess->domain_global.channels, channel_name);
2524 if (uchan == NULL) {
2525 /* Something is really wrong */
2526 ret = LTTCOMM_FATAL;
2527 goto error;
2528 }
48842b30 2529 }
2bdd86d4 2530
edb67388 2531 /* At this point, the session and channel exist on the tracer */
edb67388
DG		 2532 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2533 if (ret != LTTCOMM_OK) {
48842b30 2534 goto error;
2bdd86d4
MD		 2535 }
2536 break;
2537 }
d78d6610 2538#if 0
2bdd86d4
MD		 2539 case LTTNG_DOMAIN_UST_EXEC_NAME:
2540 case LTTNG_DOMAIN_UST_PID:
2541 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2542#endif
54d01ffb 2543 default:
1ab1ea0b 2544 ret = LTTCOMM_UND;
54d01ffb 2545 goto error;
950131af 2546 }
d36b8583 2547
54d01ffb 2548 ret = LTTCOMM_OK;
d36b8583 2549
54d01ffb
DG		 2550error:
2551 return ret;
2552}
7d29a247 2553
54d01ffb
DG		 2554/*
2555 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2556 */
2557static int cmd_enable_event_all(struct ltt_session *session, int domain,
8c9ae521 2558 char *channel_name, int event_type)
54d01ffb
DG		 2559{
2560 int ret;
2561 struct ltt_kernel_channel *kchan;
7d29a247 2562
54d01ffb
DG		 2563 switch (domain) {
2564 case LTTNG_DOMAIN_KERNEL:
2565 kchan = trace_kernel_get_channel_by_name(channel_name,
2566 session->kernel_session);
2567 if (kchan == NULL) {
2568 /* This call will notify the kernel thread */
44d3bd01
DG		 2569 ret = channel_kernel_create(session->kernel_session, NULL,
2570 kernel_poll_pipe[1]);
54d01ffb
DG		 2571 if (ret != LTTCOMM_OK) {
2572 goto error;
d36b8583 2573 }
0d0c377a 2574
8f69e5eb
DG		 2575 /* Get the newly created kernel channel pointer */
2576 kchan = trace_kernel_get_channel_by_name(channel_name,
2577 session->kernel_session);
2578 if (kchan == NULL) {
2579 /* This sould not happen... */
2580 ret = LTTCOMM_FATAL;
2581 goto error;
2582 }
2583
54d01ffb 2584 }
0fdd1e2c 2585
7a3d1328 2586 switch (event_type) {
76d45b40 2587 case LTTNG_EVENT_SYSCALL:
7a3d1328 2588 ret = event_kernel_enable_all_syscalls(session->kernel_session,
8c9ae521 2589 kchan, kernel_tracer_fd);
7a3d1328 2590 break;
76d45b40 2591 case LTTNG_EVENT_TRACEPOINT:
8c9ae521 2592 /*
7a3d1328
MD		 2593 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2594 * events already registered to the channel.
8c9ae521 2595 */
7a3d1328
MD		 2596 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2597 kchan, kernel_tracer_fd);
2598 break;
76d45b40 2599 case LTTNG_EVENT_ALL:
7a3d1328 2600 /* Enable syscalls and tracepoints */
8c9ae521
DG		 2601 ret = event_kernel_enable_all(session->kernel_session,
2602 kchan, kernel_tracer_fd);
7a3d1328
MD		 2603 break;
2604 default:
2605 ret = LTTCOMM_KERN_ENABLE_FAIL;
2606 goto error;
8c9ae521 2607 }
8f69e5eb
DG		 2608
2609 /* Manage return value */
54d01ffb 2610 if (ret != LTTCOMM_OK) {
0d0c377a 2611 goto error;
d36b8583
DG		 2612 }
2613
54d01ffb 2614 kernel_wait_quiescent(kernel_tracer_fd);
d36b8583 2615 break;
76d45b40
DG		 2616 case LTTNG_DOMAIN_UST:
2617 {
2618 struct lttng_channel *attr;
2619 struct ltt_ust_channel *uchan;
2620 struct ltt_ust_session *usess = session->ust_session;
2621
2622 /* Get channel from global UST domain */
2623 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2624 channel_name);
2625 if (uchan == NULL) {
2626 /* Create default channel */
2627 attr = channel_new_default_attr(domain);
2628 if (attr == NULL) {
2629 ret = LTTCOMM_FATAL;
2630 goto error;
2631 }
2632 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2633 attr->name[NAME_MAX - 1] = '\0';
2634
2635 /* Use the internal command enable channel */
7885e399 2636 ret = channel_ust_create(usess, domain, attr);
76d45b40
DG		 2637 if (ret != LTTCOMM_OK) {
2638 free(attr);
2639 goto error;
2640 }
2641 free(attr);
2642
2643 /* Get the newly created channel reference back */
2644 uchan = trace_ust_find_channel_by_name(
2645 usess->domain_global.channels, channel_name);
2646 if (uchan == NULL) {
2647 /* Something is really wrong */
2648 ret = LTTCOMM_FATAL;
2649 goto error;
2650 }
2651 }
2652
2653 /* At this point, the session and channel exist on the tracer */
2654
2655 switch (event_type) {
2656 case LTTNG_EVENT_ALL:
2657 case LTTNG_EVENT_TRACEPOINT:
2658 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2659 if (ret != LTTCOMM_OK) {
2660 goto error;
2661 }
2662 break;
2663 default:
2664 ret = LTTCOMM_UST_ENABLE_FAIL;
2665 goto error;
2666 }
2667
2668 /* Manage return value */
2669 if (ret != LTTCOMM_OK) {
2670 goto error;
2671 }
2672
2673 break;
2674 }
d78d6610 2675#if 0
76d45b40
DG		 2676 case LTTNG_DOMAIN_UST_EXEC_NAME:
2677 case LTTNG_DOMAIN_UST_PID:
2678 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
d78d6610 2679#endif
54d01ffb 2680 default:
1ab1ea0b 2681 ret = LTTCOMM_UND;
54d01ffb 2682 goto error;
d36b8583 2683 }
f3ed775e 2684
54d01ffb
DG		 2685 ret = LTTCOMM_OK;
2686
2687error:
2688 return ret;
2689}
2690
2691/*
2692 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2693 */
2694static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2695{
2696 int ret;
2697 ssize_t nb_events = 0;
2698
2699 switch (domain) {
2700 case LTTNG_DOMAIN_KERNEL:
2701 nb_events = kernel_list_events(kernel_tracer_fd, events);
2702 if (nb_events < 0) {
2703 ret = LTTCOMM_KERN_LIST_FAIL;
2704 goto error;
894be886 2705 }
54d01ffb 2706 break;
b551a063
DG		 2707 case LTTNG_DOMAIN_UST:
2708 nb_events = ust_app_list_events(events);
2709 if (nb_events < 0) {
2710 ret = LTTCOMM_UST_LIST_FAIL;
2711 goto error;
2712 }
2713 break;
54d01ffb 2714 default:
1ab1ea0b 2715 ret = LTTCOMM_UND;
54d01ffb
DG		 2716 goto error;
2717 }
894be886 2718
54d01ffb 2719 return nb_events;
7d29a247 2720
54d01ffb
DG		 2721error:
2722 /* Return negative value to differentiate return code */
2723 return -ret;
2724}
b389abbe 2725
54d01ffb
DG		 2726/*
2727 * Command LTTNG_START_TRACE processed by the client thread.
2728 */
2729static int cmd_start_trace(struct ltt_session *session)
2730{
2731 int ret;
54d01ffb 2732 struct ltt_kernel_session *ksession;
b9d9b220 2733 struct ltt_ust_session *usess;
b389abbe 2734
54d01ffb
DG		 2735 /* Short cut */
2736 ksession = session->kernel_session;
b9d9b220 2737 usess = session->ust_session;
5eb91c98 2738
b9ef1c83
DG		 2739 if (session->enabled) {
2740 ret = LTTCOMM_UST_START_FAIL;
2741 goto error;
2742 }
2743
464dd62d
MD		 2744 session->enabled = 1;
2745
54d01ffb
DG		 2746 /* Kernel tracing */
2747 if (ksession != NULL) {
2bdd86d4
MD		 2748 struct ltt_kernel_channel *kchan;
2749
54d01ffb
DG		 2750 /* Open kernel metadata */
2751 if (ksession->metadata == NULL) {
2752 ret = kernel_open_metadata(ksession, ksession->trace_path);
2753 if (ret < 0) {
2754 ret = LTTCOMM_KERN_META_FAIL;
2755 goto error;
b389abbe 2756 }
54d01ffb 2757 }
7d29a247 2758
54d01ffb
DG		 2759 /* Open kernel metadata stream */
2760 if (ksession->metadata_stream_fd == 0) {
2761 ret = kernel_open_metadata_stream(ksession);
2762 if (ret < 0) {
2763 ERR("Kernel create metadata stream failed");
2764 ret = LTTCOMM_KERN_STREAM_FAIL;
2765 goto error;
2766 }
2767 }
2768
2769 /* For each channel */
2770 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2771 if (kchan->stream_count == 0) {
2772 ret = kernel_open_channel_stream(kchan);
2773 if (ret < 0) {
2774 ret = LTTCOMM_KERN_STREAM_FAIL;
7d29a247
DG		 2775 goto error;
2776 }
54d01ffb
DG		 2777 /* Update the stream global counter */
2778 ksession->stream_count_global += ret;
7d29a247 2779 }
54d01ffb
DG		 2780 }
2781
2782 /* Setup kernel consumer socket and send fds to it */
2783 ret = init_kernel_tracing(ksession);
2784 if (ret < 0) {
2785 ret = LTTCOMM_KERN_START_FAIL;
2786 goto error;
2787 }
2788
2789 /* This start the kernel tracing */
2790 ret = kernel_start_session(ksession);
2791 if (ret < 0) {
2792 ret = LTTCOMM_KERN_START_FAIL;
2793 goto error;
2794 }
2795
2796 /* Quiescent wait after starting trace */
2797 kernel_wait_quiescent(kernel_tracer_fd);
2798 }
2799
36dc12cc 2800 /* Flag session that trace should start automatically */
b9d9b220
DG		 2801 if (usess) {
2802 usess->start_trace = 1;
36dc12cc 2803
b9d9b220
DG		 2804 ret = ust_app_start_trace_all(usess);
2805 if (ret < 0) {
2806 ret = LTTCOMM_UST_START_FAIL;
2807 goto error;
2808 }
2bdd86d4 2809 }
54d01ffb
DG		 2810
2811 ret = LTTCOMM_OK;
2812
2813error:
2814 return ret;
2815}
2816
2817/*
2818 * Command LTTNG_STOP_TRACE processed by the client thread.
2819 */
2820static int cmd_stop_trace(struct ltt_session *session)
2821{
2822 int ret;
2823 struct ltt_kernel_channel *kchan;
2824 struct ltt_kernel_session *ksession;
8be98f9a 2825 struct ltt_ust_session *usess;
54d01ffb
DG		 2826
2827 /* Short cut */
2828 ksession = session->kernel_session;
8be98f9a 2829 usess = session->ust_session;
54d01ffb 2830
b9ef1c83 2831 if (!session->enabled) {
190df5ac 2832 ret = LTTCOMM_UST_STOP_FAIL;
b9ef1c83
DG		 2833 goto error;
2834 }
2835
464dd62d
MD		 2836 session->enabled = 0;
2837
54d01ffb
DG		 2838 /* Kernel tracer */
2839 if (ksession != NULL) {
2840 DBG("Stop kernel tracing");
2841
2842 /* Flush all buffers before stopping */
2843 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2844 if (ret < 0) {
2845 ERR("Kernel metadata flush failed");
2846 }
f34daff7 2847
54d01ffb
DG		 2848 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2849 ret = kernel_flush_buffer(kchan);
0d0c377a 2850 if (ret < 0) {
54d01ffb 2851 ERR("Kernel flush buffer error");
7d29a247 2852 }
54d01ffb 2853 }
19e70852 2854
54d01ffb
DG		 2855 ret = kernel_stop_session(ksession);
2856 if (ret < 0) {
2857 ret = LTTCOMM_KERN_STOP_FAIL;
19e70852 2858 goto error;
f3ed775e 2859 }
54d01ffb
DG		 2860
2861 kernel_wait_quiescent(kernel_tracer_fd);
894be886 2862 }
54d01ffb 2863
8be98f9a
MD		 2864 if (usess) {
2865 usess->start_trace = 0;
2bdd86d4 2866
8be98f9a 2867 ret = ust_app_stop_trace_all(usess);
2bdd86d4 2868 if (ret < 0) {
190df5ac 2869 ret = LTTCOMM_UST_STOP_FAIL;
2bdd86d4
MD		 2870 goto error;
2871 }
2bdd86d4 2872 }
54d01ffb
DG		 2873
2874 ret = LTTCOMM_OK;
2875
2876error:
2877 return ret;
2878}
2879
2880/*
2881 * Command LTTNG_CREATE_SESSION processed by the client thread.
2882 */
730389d9 2883static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds)
54d01ffb
DG		 2884{
2885 int ret;
2886
730389d9
DG		 2887 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
2888 LTTNG_SOCK_GET_GID_CRED(creds));
54d01ffb
DG		 2889 if (ret != LTTCOMM_OK) {
2890 goto error;
2891 }
2892
2893 ret = LTTCOMM_OK;
2894
2895error:
2896 return ret;
2897}
2898
2899/*
2900 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2901 */
2902static int cmd_destroy_session(struct ltt_session *session, char *name)
2903{
2904 int ret;
2905
2906 /* Clean kernel session teardown */
2907 teardown_kernel_session(session);
84cd17c6
MD		 2908 /* UST session teardown */
2909 teardown_ust_session(session);
54d01ffb
DG		 2910
2911 /*
2912 * Must notify the kernel thread here to update it's poll setin order
2913 * to remove the channel(s)' fd just destroyed.
2914 */
2915 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2916 if (ret < 0) {
2917 perror("write kernel poll pipe");
2918 }
2919
271933a4 2920 ret = session_destroy(session);
54d01ffb
DG		 2921
2922 return ret;
2923}
2924
2925/*
2926 * Command LTTNG_CALIBRATE processed by the client thread.
2927 */
2928static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2929{
2930 int ret;
2931
2932 switch (domain) {
2933 case LTTNG_DOMAIN_KERNEL:
33a2b854 2934 {
54d01ffb 2935 struct lttng_kernel_calibrate kcalibrate;
33a2b854 2936
54d01ffb
DG		 2937 kcalibrate.type = calibrate->type;
2938 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
33a2b854 2939 if (ret < 0) {
54d01ffb
DG		 2940 ret = LTTCOMM_KERN_ENABLE_FAIL;
2941 goto error;
33a2b854 2942 }
54d01ffb
DG		 2943 break;
2944 }
4466912f
DG		 2945 case LTTNG_DOMAIN_UST:
2946 {
2947 struct lttng_ust_calibrate ucalibrate;
2948
2949 ucalibrate.type = calibrate->type;
2950 ret = ust_app_calibrate_glb(&ucalibrate);
2951 if (ret < 0) {
2952 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2953 goto error;
2954 }
2955 break;
2956 }
54d01ffb 2957 default:
1ab1ea0b 2958 ret = LTTCOMM_UND;
54d01ffb
DG		 2959 goto error;
2960 }
33a2b854 2961
54d01ffb 2962 ret = LTTCOMM_OK;
33a2b854 2963
54d01ffb
DG		 2964error:
2965 return ret;
2966}
7d29a247 2967
54d01ffb
DG		 2968/*
2969 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2970 */
2971static int cmd_register_consumer(struct ltt_session *session, int domain,
2972 char *sock_path)
2973{
2974 int ret, sock;
b389abbe 2975
54d01ffb
DG		 2976 switch (domain) {
2977 case LTTNG_DOMAIN_KERNEL:
2978 /* Can't register a consumer if there is already one */
48c4f28c 2979 if (session->kernel_session->consumer_fds_sent != 0) {
54d01ffb
DG		 2980 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2981 goto error;
2982 }
2983
2984 sock = lttcomm_connect_unix_sock(sock_path);
2985 if (sock < 0) {
2986 ret = LTTCOMM_CONNECT_FAIL;
2987 goto error;
2988 }
2989
2990 session->kernel_session->consumer_fd = sock;
2991 break;
2992 default:
2993 /* TODO: Userspace tracing */
1ab1ea0b 2994 ret = LTTCOMM_UND;
54d01ffb
DG		 2995 goto error;
2996 }
2997
2998 ret = LTTCOMM_OK;
2999
3000error:
3001 return ret;
3002}
3003
3004/*
3005 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3006 */
3007static ssize_t cmd_list_domains(struct ltt_session *session,
3008 struct lttng_domain **domains)
3009{
b551a063 3010 int ret, index = 0;
54d01ffb
DG		 3011 ssize_t nb_dom = 0;
3012
3013 if (session->kernel_session != NULL) {
b551a063 3014 DBG3("Listing domains found kernel domain");
54d01ffb
DG		 3015 nb_dom++;
3016 }
3017
b551a063
DG		 3018 if (session->ust_session != NULL) {
3019 DBG3("Listing domains found UST global domain");
3020 nb_dom++;
3021 }
54d01ffb 3022
b551a063 3023 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
54d01ffb
DG		 3024 if (*domains == NULL) {
3025 ret = -LTTCOMM_FATAL;
3026 goto error;
3027 }
3028
b551a063
DG		 3029 if (session->kernel_session != NULL) {
3030 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3031 index++;
3032 }
3033
3034 if (session->ust_session != NULL) {
3035 (*domains)[index].type = LTTNG_DOMAIN_UST;
3036 index++;
3037 }
54d01ffb 3038
54d01ffb
DG		 3039 return nb_dom;
3040
3041error:
3042 return ret;
3043}
3044
3045/*
3046 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3047 */
b551a063 3048static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
54d01ffb
DG		 3049 struct lttng_channel **channels)
3050{
3051 int ret;
3052 ssize_t nb_chan = 0;
3053
b551a063
DG		 3054 switch (domain) {
3055 case LTTNG_DOMAIN_KERNEL:
3056 if (session->kernel_session != NULL) {
3057 nb_chan = session->kernel_session->channel_count;
3058 }
0df502fd 3059 DBG3("Number of kernel channels %zd", nb_chan);
b551a063
DG		 3060 break;
3061 case LTTNG_DOMAIN_UST:
3062 if (session->ust_session != NULL) {
bec39940 3063 nb_chan = lttng_ht_get_count(
b551a063
DG		 3064 session->ust_session->domain_global.channels);
3065 }
0df502fd 3066 DBG3("Number of UST global channels %zd", nb_chan);
b551a063
DG		 3067 break;
3068 default:
3069 *channels = NULL;
1ab1ea0b 3070 ret = -LTTCOMM_UND;
54d01ffb
DG		 3071 goto error;
3072 }
3073
b551a063
DG		 3074 if (nb_chan > 0) {
3075 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3076 if (*channels == NULL) {
3077 ret = -LTTCOMM_FATAL;
3078 goto error;
3079 }
54d01ffb 3080
b551a063
DG		 3081 list_lttng_channels(domain, session, *channels);
3082 } else {
3083 *channels = NULL;
3084 }
2bdd86d4 3085
54d01ffb
DG		 3086 return nb_chan;
3087
3088error:
3089 return ret;
3090}
3091
3092/*
3093 * Command LTTNG_LIST_EVENTS processed by the client thread.
3094 */
b551a063 3095static ssize_t cmd_list_events(int domain, struct ltt_session *session,
54d01ffb
DG		 3096 char *channel_name, struct lttng_event **events)
3097{
b551a063 3098 int ret = 0;
54d01ffb 3099 ssize_t nb_event = 0;
54d01ffb 3100
b551a063
DG		 3101 switch (domain) {
3102 case LTTNG_DOMAIN_KERNEL:
3103 if (session->kernel_session != NULL) {
3104 nb_event = list_lttng_kernel_events(channel_name,
3105 session->kernel_session, events);
54d01ffb 3106 }
b551a063
DG		 3107 break;
3108 case LTTNG_DOMAIN_UST:
3109 {
3110 if (session->ust_session != NULL) {
3111 nb_event = list_lttng_ust_global_events(channel_name,
3112 &session->ust_session->domain_global, events);
3113 }
3114 break;
54d01ffb 3115 }
b551a063 3116 default:
1ab1ea0b 3117 ret = -LTTCOMM_UND;
54d01ffb
DG		 3118 goto error;
3119 }
3120
b551a063 3121 ret = nb_event;
54d01ffb
DG		 3122
3123error:
3124 return ret;
3125}
3126
3127/*
3128 * Process the command requested by the lttng client within the command
3129 * context structure. This function make sure that the return structure (llm)
3130 * is set and ready for transmission before returning.
3131 *
3132 * Return any error encountered or 0 for success.
3133 */
3134static int process_client_msg(struct command_ctx *cmd_ctx)
3135{
3136 int ret = LTTCOMM_OK;
44d3bd01 3137 int need_tracing_session = 1;
54d01ffb
DG		 3138
3139 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3140
4fba7219
DG		 3141 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3142 ret = LTTCOMM_KERN_NA;
3143 goto error;
3144 }
3145
54d01ffb
DG		 3146 /*
3147 * Check for command that don't needs to allocate a returned payload. We do
44d3bd01 3148 * this here so we don't have to make the call for no payload at each
54d01ffb
DG		 3149 * command.
3150 */
3151 switch(cmd_ctx->lsm->cmd_type) {
3152 case LTTNG_LIST_SESSIONS:
3153 case LTTNG_LIST_TRACEPOINTS:
3154 case LTTNG_LIST_DOMAINS:
3155 case LTTNG_LIST_CHANNELS:
3156 case LTTNG_LIST_EVENTS:
3157 break;
3158 default:
3159 /* Setup lttng message with no payload */
3160 ret = setup_lttng_msg(cmd_ctx, 0);
3161 if (ret < 0) {
3162 /* This label does not try to unlock the session */
3163 goto init_setup_error;
3164 }
3165 }
3166
3167 /* Commands that DO NOT need a session. */
3168 switch (cmd_ctx->lsm->cmd_type) {
3169 case LTTNG_CALIBRATE:
3170 case LTTNG_CREATE_SESSION:
3171 case LTTNG_LIST_SESSIONS:
3172 case LTTNG_LIST_TRACEPOINTS:
44d3bd01 3173 need_tracing_session = 0;
54d01ffb
DG		 3174 break;
3175 default:
3176 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
74babd95 3177 session_lock_list();
54d01ffb 3178 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
74babd95 3179 session_unlock_list();
54d01ffb
DG		 3180 if (cmd_ctx->session == NULL) {
3181 if (cmd_ctx->lsm->session.name != NULL) {
3182 ret = LTTCOMM_SESS_NOT_FOUND;
3183 } else {
3184 /* If no session name specified */
3185 ret = LTTCOMM_SELECT_SESS;
3186 }
3187 goto error;
3188 } else {
3189 /* Acquire lock for the session */
3190 session_lock(cmd_ctx->session);
3191 }
3192 break;
3193 }
b389abbe 3194
54d01ffb
DG		 3195 /*
3196 * Check domain type for specific "pre-action".
3197 */
3198 switch (cmd_ctx->lsm->domain.type) {
3199 case LTTNG_DOMAIN_KERNEL:
d1f1c568
DG		 3200 if (!is_root) {
3201 ret = LTTCOMM_KERN_NA;
3202 goto error;
3203 }
3204
54d01ffb
DG		 3205 /* Kernel tracer check */
3206 if (kernel_tracer_fd == 0) {
3207 /* Basically, load kernel tracer modules */
096102bd
DG		 3208 ret = init_kernel_tracer();
3209 if (ret != 0) {
54d01ffb
DG		 3210 goto error;
3211 }
3212 }
5eb91c98 3213
54d01ffb 3214 /* Need a session for kernel command */
44d3bd01 3215 if (need_tracing_session) {
54d01ffb 3216 if (cmd_ctx->session->kernel_session == NULL) {
6df2e2c9 3217 ret = create_kernel_session(cmd_ctx->session);
5eb91c98 3218 if (ret < 0) {
54d01ffb 3219 ret = LTTCOMM_KERN_SESS_FAIL;
5eb91c98
DG		 3220 goto error;
3221 }
b389abbe 3222 }
7d29a247 3223
54d01ffb 3224 /* Start the kernel consumer daemon */
3bd1e081
MD		 3225 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3226 if (kconsumer_data.pid == 0 &&
54d01ffb 3227 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3bd1e081
MD		 3228 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3229 ret = start_consumerd(&kconsumer_data);
7d29a247 3230 if (ret < 0) {
54d01ffb
DG		 3231 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3232 goto error;
950131af 3233 }
3ff2ecac
MD		 3234 } else {
3235 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
33a2b854 3236 }
0d0c377a 3237 }
54d01ffb 3238 break;
2bdd86d4 3239 case LTTNG_DOMAIN_UST:
44d3bd01 3240 {
44d3bd01 3241 if (need_tracing_session) {
f6a9efaa 3242 if (cmd_ctx->session->ust_session == NULL) {
44d3bd01 3243 ret = create_ust_session(cmd_ctx->session,
6df2e2c9 3244 &cmd_ctx->lsm->domain);
44d3bd01
DG		 3245 if (ret != LTTCOMM_OK) {
3246 goto error;
3247 }
3248 }
7753dea8
MD		 3249 /* Start the UST consumer daemons */
3250 /* 64-bit */
3251 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
fc7a59ce 3252 if (consumerd64_bin[0] != '\0' &&
7753dea8 3253 ustconsumer64_data.pid == 0 &&
2bdd86d4 3254 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
7753dea8
MD		 3255 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3256 ret = start_consumerd(&ustconsumer64_data);
2bdd86d4 3257 if (ret < 0) {
7753dea8
MD		 3258 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3259 ust_consumerd64_fd = -EINVAL;
2bdd86d4
MD		 3260 goto error;
3261 }
48842b30 3262
7753dea8 3263 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3ff2ecac 3264 } else {
7753dea8
MD		 3265 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3266 }
3267 /* 32-bit */
fc7a59ce 3268 if (consumerd32_bin[0] != '\0' &&
7753dea8
MD		 3269 ustconsumer32_data.pid == 0 &&
3270 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3271 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3272 ret = start_consumerd(&ustconsumer32_data);
3273 if (ret < 0) {
3274 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3275 ust_consumerd32_fd = -EINVAL;
3276 goto error;
3277 }
3278 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3279 } else {
3280 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2bdd86d4 3281 }
44d3bd01
DG		 3282 }
3283 break;
48842b30 3284 }
54d01ffb 3285 default:
54d01ffb
DG		 3286 break;
3287 }
33a2b854 3288
8e0af1b4
MD		 3289 /*
3290 * Check that the UID or GID match that of the tracing session.
3291 * The root user can interact with all sessions.
3292 */
3293 if (need_tracing_session) {
3294 if (!session_access_ok(cmd_ctx->session,
730389d9
DG		 3295 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3296 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
8e0af1b4
MD		 3297 ret = LTTCOMM_EPERM;
3298 goto error;
3299 }
3300 }
3301
54d01ffb
DG		 3302 /* Process by command type */
3303 switch (cmd_ctx->lsm->cmd_type) {
3304 case LTTNG_ADD_CONTEXT:
3305 {
3306 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3307 cmd_ctx->lsm->u.context.channel_name,
3308 cmd_ctx->lsm->u.context.event_name,
3309 &cmd_ctx->lsm->u.context.ctx);
3310 break;
3311 }
3312 case LTTNG_DISABLE_CHANNEL:
3313 {
3314 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3315 cmd_ctx->lsm->u.disable.channel_name);
3316 break;
3317 }
3318 case LTTNG_DISABLE_EVENT:
3319 {
3320 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3321 cmd_ctx->lsm->u.disable.channel_name,
3322 cmd_ctx->lsm->u.disable.name);
33a2b854
DG		 3323 break;
3324 }
54d01ffb
DG		 3325 case LTTNG_DISABLE_ALL_EVENT:
3326 {
2bdd86d4 3327 DBG("Disabling all events");
54d01ffb
DG		 3328
3329 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3330 cmd_ctx->lsm->u.disable.channel_name);
3331 break;
3332 }
3333 case LTTNG_ENABLE_CHANNEL:
3334 {
aea829b3 3335 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
54d01ffb
DG		 3336 &cmd_ctx->lsm->u.channel.chan);
3337 break;
3338 }
3339 case LTTNG_ENABLE_EVENT:
3340 {
3341 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3342 cmd_ctx->lsm->u.enable.channel_name,
3343 &cmd_ctx->lsm->u.enable.event);
3344 break;
3345 }
3346 case LTTNG_ENABLE_ALL_EVENT:
3347 {
2bdd86d4 3348 DBG("Enabling all events");
54d01ffb
DG		 3349
3350 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
8c9ae521
DG		 3351 cmd_ctx->lsm->u.enable.channel_name,
3352 cmd_ctx->lsm->u.enable.event.type);
54d01ffb
DG		 3353 break;
3354 }
052da939 3355 case LTTNG_LIST_TRACEPOINTS:
2ef84c95 3356 {
9f19cc17 3357 struct lttng_event *events;
54d01ffb 3358 ssize_t nb_events;
052da939 3359
54d01ffb
DG		 3360 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3361 if (nb_events < 0) {
3362 ret = -nb_events;
3363 goto error;
2ef84c95
DG		 3364 }
3365
3366 /*
3367 * Setup lttng message with payload size set to the event list size in
3368 * bytes and then copy list into the llm payload.
3369 */
052da939 3370 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2ef84c95 3371 if (ret < 0) {
052da939 3372 free(events);
2ef84c95
DG		 3373 goto setup_error;
3374 }
3375
3376 /* Copy event list into message payload */
9f19cc17 3377 memcpy(cmd_ctx->llm->payload, events,
052da939 3378 sizeof(struct lttng_event) * nb_events);
2ef84c95 3379
9f19cc17 3380 free(events);
2ef84c95
DG		 3381
3382 ret = LTTCOMM_OK;
3383 break;
3384 }
f3ed775e 3385 case LTTNG_START_TRACE:
8c0faa1d 3386 {
54d01ffb 3387 ret = cmd_start_trace(cmd_ctx->session);
8c0faa1d
DG		 3388 break;
3389 }
f3ed775e 3390 case LTTNG_STOP_TRACE:
8c0faa1d 3391 {
54d01ffb 3392 ret = cmd_stop_trace(cmd_ctx->session);
8c0faa1d
DG		 3393 break;
3394 }
5e16da05
MD		 3395 case LTTNG_CREATE_SESSION:
3396 {
54d01ffb 3397 ret = cmd_create_session(cmd_ctx->lsm->session.name,
6df2e2c9 3398 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
5e16da05
MD		 3399 break;
3400 }
3401 case LTTNG_DESTROY_SESSION:
3402 {
54d01ffb
DG		 3403 ret = cmd_destroy_session(cmd_ctx->session,
3404 cmd_ctx->lsm->session.name);
5461b305 3405 break;
5e16da05 3406 }
9f19cc17 3407 case LTTNG_LIST_DOMAINS:
5e16da05 3408 {
54d01ffb
DG		 3409 ssize_t nb_dom;
3410 struct lttng_domain *domains;
5461b305 3411
54d01ffb
DG		 3412 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3413 if (nb_dom < 0) {
3414 ret = -nb_dom;
3415 goto error;
ce3d728c 3416 }
520ff687 3417
54d01ffb 3418 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
5461b305
DG		 3419 if (ret < 0) {
3420 goto setup_error;
520ff687 3421 }
57167058 3422
54d01ffb
DG		 3423 /* Copy event list into message payload */
3424 memcpy(cmd_ctx->llm->payload, domains,
3425 nb_dom * sizeof(struct lttng_domain));
3426
3427 free(domains);
5e16da05 3428
5461b305 3429 ret = LTTCOMM_OK;
5e16da05
MD		 3430 break;
3431 }
9f19cc17 3432 case LTTNG_LIST_CHANNELS:
5e16da05 3433 {
54d01ffb
DG		 3434 size_t nb_chan;
3435 struct lttng_channel *channels;
3436
b551a063
DG		 3437 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3438 cmd_ctx->session, &channels);
54d01ffb
DG		 3439 if (nb_chan < 0) {
3440 ret = -nb_chan;
3441 goto error;
5461b305 3442 }
ca95a216 3443
54d01ffb 3444 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
5461b305
DG		 3445 if (ret < 0) {
3446 goto setup_error;
3447 }
9f19cc17 3448
54d01ffb
DG		 3449 /* Copy event list into message payload */
3450 memcpy(cmd_ctx->llm->payload, channels,
3451 nb_chan * sizeof(struct lttng_channel));
3452
3453 free(channels);
9f19cc17
DG		 3454
3455 ret = LTTCOMM_OK;
5461b305 3456 break;
5e16da05 3457 }
9f19cc17 3458 case LTTNG_LIST_EVENTS:
5e16da05 3459 {
b551a063 3460 ssize_t nb_event;
684d34d2 3461 struct lttng_event *events = NULL;
9f19cc17 3462
b551a063 3463 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
54d01ffb
DG		 3464 cmd_ctx->lsm->u.list.channel_name, &events);
3465 if (nb_event < 0) {
3466 ret = -nb_event;
3467 goto error;
5461b305 3468 }
ca95a216 3469
54d01ffb 3470 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
5461b305
DG		 3471 if (ret < 0) {
3472 goto setup_error;
3473 }
9f19cc17 3474
54d01ffb
DG		 3475 /* Copy event list into message payload */
3476 memcpy(cmd_ctx->llm->payload, events,
3477 nb_event * sizeof(struct lttng_event));
9f19cc17 3478
54d01ffb 3479 free(events);
9f19cc17
DG		 3480
3481 ret = LTTCOMM_OK;
5461b305 3482 break;
5e16da05
MD		 3483 }
3484 case LTTNG_LIST_SESSIONS:
3485 {
8e0af1b4 3486 unsigned int nr_sessions;
5461b305 3487
8e0af1b4 3488 session_lock_list();
730389d9
DG		 3489 nr_sessions = lttng_sessions_count(
3490 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3491 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
d32fb093 3492
8e0af1b4 3493 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
5461b305 3494 if (ret < 0) {
54d01ffb 3495 session_unlock_list();
5461b305 3496 goto setup_error;
e065084a 3497 }
5e16da05 3498
6c9cc2ab 3499 /* Filled the session array */
8e0af1b4 3500 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
730389d9
DG		 3501 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3502 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
6c9cc2ab 3503
54d01ffb 3504 session_unlock_list();
5e16da05 3505
5461b305 3506 ret = LTTCOMM_OK;
5e16da05
MD		 3507 break;
3508 }
d0254c7c
MD		 3509 case LTTNG_CALIBRATE:
3510 {
54d01ffb
DG		 3511 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3512 &cmd_ctx->lsm->u.calibrate);
d0254c7c
MD		 3513 break;
3514 }
d9800920
DG		 3515 case LTTNG_REGISTER_CONSUMER:
3516 {
54d01ffb
DG		 3517 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3518 cmd_ctx->lsm->u.reg.path);
d9800920
DG		 3519 break;
3520 }
5e16da05 3521 default:
5e16da05 3522 ret = LTTCOMM_UND;
5461b305 3523 break;
fac6795d
DG		 3524 }
3525
5461b305 3526error:
5461b305
DG		 3527 if (cmd_ctx->llm == NULL) {
3528 DBG("Missing llm structure. Allocating one.");
894be886 3529 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG		 3530 goto setup_error;
3531 }
3532 }
54d01ffb 3533 /* Set return code */
5461b305 3534 cmd_ctx->llm->ret_code = ret;
5461b305 3535setup_error:
b5541356 3536 if (cmd_ctx->session) {
54d01ffb 3537 session_unlock(cmd_ctx->session);
b5541356 3538 }
54d01ffb 3539init_setup_error:
8028d920 3540 return ret;
fac6795d
DG		 3541}
3542
1d4b027a 3543/*
d063d709
DG		 3544 * This thread manage all clients request using the unix client socket for
3545 * communication.
1d4b027a
DG		 3546 */
3547static void *thread_manage_clients(void *data)
3548{
5eb91c98
DG		 3549 int sock = 0, ret, i, pollfd;
3550 uint32_t revents, nb_fd;
273ea72c 3551 struct command_ctx *cmd_ctx = NULL;
5eb91c98 3552 struct lttng_poll_event events;
1d4b027a
DG		 3553
3554 DBG("[thread] Manage client started");
3555
f6a9efaa
DG		 3556 rcu_register_thread();
3557
1d4b027a
DG		 3558 ret = lttcomm_listen_unix_sock(client_sock);
3559 if (ret < 0) {
3560 goto error;
3561 }
3562
5eb91c98
DG		 3563 /*
3564 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3565 * more will be added to this poll set.
3566 */
3567 ret = create_thread_poll_set(&events, 2);
3568 if (ret < 0) {
3569 goto error;
3570 }
273ea72c 3571
5eb91c98
DG		 3572 /* Add the application registration socket */
3573 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3574 if (ret < 0) {
3575 goto error;
3576 }
273ea72c 3577
bbd973c2
DG		 3578 /*
3579 * Notify parent pid that we are ready to accept command for client side.
1d4b027a
DG		 3580 */
3581 if (opt_sig_parent) {
8db8d1dc 3582 kill(ppid, SIGUSR1);
1d4b027a
DG		 3583 }
3584
3585 while (1) {
1d4b027a 3586 DBG("Accepting client command ...");
273ea72c 3587
5eb91c98
DG		 3588 nb_fd = LTTNG_POLL_GETNB(&events);
3589
273ea72c 3590 /* Inifinite blocking call, waiting for transmission */
5eb91c98 3591 ret = lttng_poll_wait(&events, -1);
273ea72c 3592 if (ret < 0) {
273ea72c
DG		 3593 goto error;
3594 }
3595
5eb91c98
DG		 3596 for (i = 0; i < nb_fd; i++) {
3597 /* Fetch once the poll data */
3598 revents = LTTNG_POLL_GETEV(&events, i);
3599 pollfd = LTTNG_POLL_GETFD(&events, i);
3600
3601 /* Thread quit pipe has been closed. Killing thread. */
3602 ret = check_thread_quit_pipe(pollfd, revents);
3603 if (ret) {
3604 goto error;
3605 }
3606
3607 /* Event on the registration socket */
3608 if (pollfd == client_sock) {
3609 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3610 ERR("Client socket poll error");
3611 goto error;
3612 }
3613 }
3614 }
3615
3616 DBG("Wait for client response");
3617
3618 sock = lttcomm_accept_unix_sock(client_sock);
3619 if (sock < 0) {
273ea72c 3620 goto error;
273ea72c
DG		 3621 }
3622
be040666
DG		 3623 /* Set socket option for credentials retrieval */
3624 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3625 if (ret < 0) {
3626 goto error;
3627 }
3628
5eb91c98 3629 /* Allocate context command to process the client request */
ba7f0ae5 3630 cmd_ctx = zmalloc(sizeof(struct command_ctx));
5eb91c98 3631 if (cmd_ctx == NULL) {
ba7f0ae5 3632 perror("zmalloc cmd_ctx");
1d4b027a 3633 goto error;
5eb91c98 3634 }
1d4b027a 3635
5eb91c98 3636 /* Allocate data buffer for reception */
ba7f0ae5 3637 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
5eb91c98 3638 if (cmd_ctx->lsm == NULL) {
ba7f0ae5 3639 perror("zmalloc cmd_ctx->lsm");
5eb91c98
DG		 3640 goto error;
3641 }
1d4b027a 3642
5eb91c98
DG		 3643 cmd_ctx->llm = NULL;
3644 cmd_ctx->session = NULL;
1d4b027a 3645
5eb91c98
DG		 3646 /*
3647 * Data is received from the lttng client. The struct
3648 * lttcomm_session_msg (lsm) contains the command and data request of
3649 * the client.
3650 */
3651 DBG("Receiving data from client ...");
be040666
DG		 3652 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3653 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
5eb91c98
DG		 3654 if (ret <= 0) {
3655 DBG("Nothing recv() from client... continuing");
3656 close(sock);
3657 free(cmd_ctx);
3658 continue;
3659 }
1d4b027a 3660
5eb91c98
DG		 3661 // TODO: Validate cmd_ctx including sanity check for
3662 // security purpose.
f7776ea7 3663
f6a9efaa 3664 rcu_thread_online();
5eb91c98
DG		 3665 /*
3666 * This function dispatch the work to the kernel or userspace tracer
3667 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3668 * informations for the client. The command context struct contains
3669 * everything this function may needs.
3670 */
3671 ret = process_client_msg(cmd_ctx);
f6a9efaa 3672 rcu_thread_offline();
5eb91c98 3673 if (ret < 0) {
bbd973c2 3674 /*
5eb91c98 3675 * TODO: Inform client somehow of the fatal error. At
ba7f0ae5 3676 * this point, ret < 0 means that a zmalloc failed
5eb91c98 3677 * (ENOMEM). Error detected but still accept command.
bbd973c2 3678 */
bbd973c2 3679 clean_command_ctx(&cmd_ctx);
5eb91c98
DG		 3680 continue;
3681 }
d6e4fca4 3682
54d01ffb
DG		 3683 DBG("Sending response (size: %d, retcode: %s)",
3684 cmd_ctx->lttng_msg_size,
9a745bc7 3685 lttng_strerror(-cmd_ctx->llm->ret_code));
54d01ffb 3686 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
5eb91c98
DG		 3687 if (ret < 0) {
3688 ERR("Failed to send data back to client");
bbd973c2 3689 }
1d4b027a 3690
5eb91c98 3691 /* End of transmission */
273ea72c 3692 close(sock);
be040666
DG		 3693
3694 clean_command_ctx(&cmd_ctx);
273ea72c
DG		 3695 }
3696
5eb91c98
DG		 3697error:
3698 DBG("Client thread dying");
273ea72c 3699 unlink(client_unix_sock_path);
5eb91c98
DG		 3700 close(client_sock);
3701 close(sock);
273ea72c 3702
5eb91c98 3703 lttng_poll_clean(&events);
a2fb29a5 3704 clean_command_ctx(&cmd_ctx);
f6a9efaa
DG		 3705
3706 rcu_unregister_thread();
1d4b027a
DG		 3707 return NULL;
3708}
3709
3710
fac6795d
DG		 3711/*
3712 * usage function on stderr
3713 */
3714static void usage(void)
3715{
b716ce68 3716 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG		 3717 fprintf(stderr, " -h, --help Display this usage.\n");
3718 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3719 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3720 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3721 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
7753dea8
MD		 3722 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3723 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3724 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3725 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
ebaeda94
MD		 3726 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3727 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3728 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3729 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
d6f42150
DG		 3730 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3731 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3732 fprintf(stderr, " -V, --version Show version number.\n");
3733 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3734 fprintf(stderr, " -q, --quiet No output at all.\n");
3735 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3bd1e081 3736 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4fba7219 3737 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
fac6795d
DG		 3738}
3739
3740/*
3741 * daemon argument parsing
3742 */
3743static int parse_args(int argc, char **argv)
3744{
3745 int c;
3746
3747 static struct option long_options[] = {
3748 { "client-sock", 1, 0, 'c' },
3749 { "apps-sock", 1, 0, 'a' },
3bd1e081
MD		 3750 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3751 { "kconsumerd-err-sock", 1, 0, 'E' },
7753dea8
MD		 3752 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3753 { "ustconsumerd32-err-sock", 1, 0, 'H' },
ebaeda94
MD		 3754 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3755 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3756 { "consumerd32-path", 1, 0, 'u' },
3757 { "consumerd32-libdir", 1, 0, 'U' },
3758 { "consumerd64-path", 1, 0, 't' },
3759 { "consumerd64-libdir", 1, 0, 'T' },
fac6795d 3760 { "daemonize", 0, 0, 'd' },
5b8719f5 3761 { "sig-parent", 0, 0, 'S' },
fac6795d
DG		 3762 { "help", 0, 0, 'h' },
3763 { "group", 1, 0, 'g' },
3764 { "version", 0, 0, 'V' },
75462a81 3765 { "quiet", 0, 0, 'q' },
3f9947db 3766 { "verbose", 0, 0, 'v' },
3bd1e081 3767 { "verbose-consumer", 0, 0, 'Z' },
4fba7219 3768 { "no-kernel", 0, 0, 'N' },
fac6795d
DG		 3769 { NULL, 0, 0, 0 }
3770 };
3771
3772 while (1) {
3773 int option_index = 0;
4fba7219 3774 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
54d01ffb 3775 long_options, &option_index);
fac6795d
DG		 3776 if (c == -1) {
3777 break;
3778 }
3779
3780 switch (c) {
3781 case 0:
3782 fprintf(stderr, "option %s", long_options[option_index].name);
3783 if (optarg) {
3784 fprintf(stderr, " with arg %s\n", optarg);
3785 }
3786 break;
b716ce68 3787 case 'c':
fac6795d
DG		 3788 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3789 break;
3790 case 'a':
3791 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3792 break;
3793 case 'd':
3794 opt_daemon = 1;
3795 break;
3796 case 'g':
fb09408a 3797 opt_tracing_group = optarg;
fac6795d
DG		 3798 break;
3799 case 'h':
3800 usage();
3801 exit(EXIT_FAILURE);
3802 case 'V':
3803 fprintf(stdout, "%s\n", VERSION);
3804 exit(EXIT_SUCCESS);
5b8719f5
DG		 3805 case 'S':
3806 opt_sig_parent = 1;
3807 break;
d6f42150 3808 case 'E':
3bd1e081 3809 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150
DG		 3810 break;
3811 case 'C':
3bd1e081
MD		 3812 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3813 break;
3814 case 'F':
7753dea8 3815 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3bd1e081
MD		 3816 break;
3817 case 'D':
7753dea8
MD		 3818 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3819 break;
3820 case 'H':
3821 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3822 break;
3823 case 'G':
3824 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
d6f42150 3825 break;
4fba7219
DG		 3826 case 'N':
3827 opt_no_kernel = 1;
3828 break;
75462a81
DG		 3829 case 'q':
3830 opt_quiet = 1;
3831 break;
3f9947db 3832 case 'v':
53086306
DG		 3833 /* Verbose level can increase using multiple -v */
3834 opt_verbose += 1;
3f9947db 3835 break;
31f73cc9 3836 case 'Z':
3bd1e081 3837 opt_verbose_consumer += 1;
31f73cc9 3838 break;
fb09408a 3839 case 'u':
fc7a59ce 3840 consumerd32_bin= optarg;
ebaeda94
MD		 3841 break;
3842 case 'U':
3843 consumerd32_libdir = optarg;
7753dea8
MD		 3844 break;
3845 case 't':
fc7a59ce 3846 consumerd64_bin = optarg;
ebaeda94
MD		 3847 break;
3848 case 'T':
3849 consumerd64_libdir = optarg;
fb09408a 3850 break;
fac6795d
DG		 3851 default:
3852 /* Unknown option or other error.
3853 * Error is printed by getopt, just return */
3854 return -1;
3855 }
3856 }
3857
3858 return 0;
3859}
3860
3861/*
d063d709 3862 * Creates the two needed socket by the daemon.
d6f42150
DG		 3863 * apps_sock - The communication socket for all UST apps.
3864 * client_sock - The communication of the cli tool (lttng).
fac6795d 3865 */
cf3af59e 3866static int init_daemon_socket(void)
fac6795d
DG		 3867{
3868 int ret = 0;
3869 mode_t old_umask;
3870
3871 old_umask = umask(0);
3872
3873 /* Create client tool unix socket */
d6f42150
DG		 3874 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3875 if (client_sock < 0) {
3876 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG		 3877 ret = -1;
3878 goto end;
3879 }
3880
3881 /* File permission MUST be 660 */
3882 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3883 if (ret < 0) {
d6f42150 3884 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG		 3885 perror("chmod");
3886 goto end;
3887 }
3888
3889 /* Create the application unix socket */
d6f42150
DG		 3890 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3891 if (apps_sock < 0) {
3892 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG		 3893 ret = -1;
3894 goto end;
3895 }
3896
d6f42150 3897 /* File permission MUST be 666 */
54d01ffb
DG		 3898 ret = chmod(apps_unix_sock_path,
3899 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fac6795d 3900 if (ret < 0) {
d6f42150 3901 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG		 3902 perror("chmod");
3903 goto end;
3904 }
3905
3906end:
3907 umask(old_umask);
3908 return ret;
3909}
3910
3911/*
54d01ffb
DG		 3912 * Check if the global socket is available, and if a daemon is answering at the
3913 * other side. If yes, error is returned.
fac6795d 3914 */
cf3af59e 3915static int check_existing_daemon(void)
fac6795d 3916{
7d8234d9 3917 /* Is there anybody out there ? */
099e26bd 3918 if (lttng_session_daemon_alive()) {
7d8234d9 3919 return -EEXIST;
099e26bd 3920 }
b09c7c76
DG		 3921
3922 return 0;
fac6795d
DG		 3923}
3924
fac6795d 3925/*
d063d709 3926 * Set the tracing group gid onto the client socket.
5e16da05 3927 *
d063d709 3928 * Race window between mkdir and chown is OK because we are going from more
d1613cf5 3929 * permissive (root.root) to less permissive (root.tracing).
fac6795d 3930 */
be040666 3931static int set_permissions(char *rundir)
fac6795d
DG		 3932{
3933 int ret;
996b65c8 3934 gid_t gid;
fac6795d 3935
996b65c8
MD		 3936 gid = allowed_group();
3937 if (gid < 0) {
be040666
DG		 3938 WARN("No tracing group detected");
3939 ret = 0;
fac6795d
DG		 3940 goto end;
3941 }
3942
d6f42150 3943 /* Set lttng run dir */
be040666 3944 ret = chown(rundir, 0, gid);
d6f42150 3945 if (ret < 0) {
be040666 3946 ERR("Unable to set group on %s", rundir);
d6f42150
DG		 3947 perror("chown");
3948 }
3949
d1613cf5
JN		 3950 /* Ensure tracing group can search the run dir */
3951 ret = chmod(rundir, S_IRWXU | S_IXGRP);
3952 if (ret < 0) {
3953 ERR("Unable to set permissions on %s", rundir);
3954 perror("chmod");
3955 }
3956
d6f42150 3957 /* lttng client socket path */
996b65c8 3958 ret = chown(client_unix_sock_path, 0, gid);
fac6795d 3959 if (ret < 0) {
d6f42150
DG		 3960 ERR("Unable to set group on %s", client_unix_sock_path);
3961 perror("chown");
3962 }
3963
3bd1e081
MD		 3964 /* kconsumer error socket path */
3965 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
d6f42150 3966 if (ret < 0) {
3bd1e081
MD		 3967 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3968 perror("chown");
3969 }
3970
7753dea8
MD		 3971 /* 64-bit ustconsumer error socket path */
3972 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3973 if (ret < 0) {
3974 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3975 perror("chown");
3976 }
3977
3978 /* 32-bit ustconsumer compat32 error socket path */
3979 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3bd1e081 3980 if (ret < 0) {
7753dea8 3981 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
fac6795d
DG		 3982 perror("chown");
3983 }
3984
d6f42150 3985 DBG("All permissions are set");
e07ae692 3986
fac6795d
DG		 3987end:
3988 return ret;
3989}
3990
7a485870 3991/*
d063d709 3992 * Create the pipe used to wake up the kernel thread.
7a485870
DG		 3993 */
3994static int create_kernel_poll_pipe(void)
3995{
730389d9
DG		 3996 int ret, i;
3997
3998 ret = pipe(kernel_poll_pipe);
3999 if (ret < 0) {
4000 PERROR("kernel poll pipe");
4001 goto error;
4002 }
4003
4004 for (i = 0; i < 2; i++) {
4005 ret = fcntl(kernel_poll_pipe[i], F_SETFD, FD_CLOEXEC);
4006 if (ret < 0) {
4007 PERROR("fcntl kernel_poll_pipe");
4008 goto error;
4009 }
4010 }
4011
4012error:
4013 return ret;
7a485870
DG		 4014}
4015
099e26bd
DG		 4016/*
4017 * Create the application command pipe to wake thread_manage_apps.
4018 */
4019static int create_apps_cmd_pipe(void)
4020{
730389d9
DG		 4021 int ret, i;
4022
4023 ret = pipe(apps_cmd_pipe);
4024 if (ret < 0) {
4025 PERROR("apps cmd pipe");
4026 goto error;
4027 }
4028
4029 for (i = 0; i < 2; i++) {
4030 ret = fcntl(apps_cmd_pipe[i], F_SETFD, FD_CLOEXEC);
4031 if (ret < 0) {
4032 PERROR("fcntl apps_cmd_pipe");
4033 goto error;
4034 }
4035 }
4036
4037error:
4038 return ret;
099e26bd
DG		 4039}
4040
d6f42150 4041/*
d063d709 4042 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 4043 */
67e40797 4044static int create_lttng_rundir(const char *rundir)
d6f42150
DG		 4045{
4046 int ret;
4047
67e40797
DG		 4048 DBG3("Creating LTTng run directory: %s", rundir);
4049
d1613cf5 4050 ret = mkdir(rundir, S_IRWXU);
d6f42150 4051 if (ret < 0) {
b1f11e69 4052 if (errno != EEXIST) {
67e40797 4053 ERR("Unable to create %s", rundir);
b1f11e69
DG		 4054 goto error;
4055 } else {
4056 ret = 0;
4057 }
d6f42150
DG		 4058 }
4059
4060error:
4061 return ret;
4062}
4063
4064/*
d063d709
DG		 4065 * Setup sockets and directory needed by the kconsumerd communication with the
4066 * session daemon.
d6f42150 4067 */
67e40797
DG		 4068static int set_consumer_sockets(struct consumer_data *consumer_data,
4069 const char *rundir)
d6f42150
DG		 4070{
4071 int ret;
67e40797 4072 char path[PATH_MAX];
d6f42150 4073
67e40797 4074 switch (consumer_data->type) {
7753dea8 4075 case LTTNG_CONSUMER_KERNEL:
60922cb0 4076 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
7753dea8
MD		 4077 break;
4078 case LTTNG_CONSUMER64_UST:
60922cb0 4079 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
7753dea8
MD		 4080 break;
4081 case LTTNG_CONSUMER32_UST:
60922cb0 4082 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
7753dea8
MD		 4083 break;
4084 default:
4085 ERR("Consumer type unknown");
4086 ret = -EINVAL;
4087 goto error;
d6f42150
DG		 4088 }
4089
67e40797
DG		 4090 DBG2("Creating consumer directory: %s", path);
4091
d1613cf5 4092 ret = mkdir(path, S_IRWXU);
d6f42150 4093 if (ret < 0) {
6beb2242 4094 if (errno != EEXIST) {
3bd1e081 4095 ERR("Failed to create %s", path);
6beb2242
DG		 4096 goto error;
4097 }
4098 ret = 0;
d6f42150
DG		 4099 }
4100
4101 /* Create the kconsumerd error unix socket */
3bd1e081
MD		 4102 consumer_data->err_sock =
4103 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4104 if (consumer_data->err_sock < 0) {
4105 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG		 4106 ret = -1;
4107 goto error;
4108 }
4109
4110 /* File permission MUST be 660 */
3bd1e081 4111 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 4112 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 4113 if (ret < 0) {
3bd1e081 4114 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 4115 PERROR("chmod");
d6f42150
DG		 4116 goto error;
4117 }
4118
4119error:
4120 return ret;
4121}
4122
fac6795d 4123/*
d063d709 4124 * Signal handler for the daemon
cf3af59e 4125 *
54d01ffb
DG		 4126 * Simply stop all worker threads, leaving main() return gracefully after
4127 * joining all threads and calling cleanup().
fac6795d
DG		 4128 */
4129static void sighandler(int sig)
4130{
4131 switch (sig) {
cf3af59e 4132 case SIGPIPE:
af87c45a 4133 DBG("SIGPIPE caught");
cf3af59e
MD		 4134 return;
4135 case SIGINT:
af87c45a 4136 DBG("SIGINT caught");
cf3af59e
MD		 4137 stop_threads();
4138 break;
4139 case SIGTERM:
af87c45a 4140 DBG("SIGTERM caught");
cf3af59e
MD		 4141 stop_threads();
4142 break;
4143 default:
4144 break;
fac6795d 4145 }
fac6795d
DG		 4146}
4147
4148/*
d063d709 4149 * Setup signal handler for :
1d4b027a 4150 * SIGINT, SIGTERM, SIGPIPE
fac6795d 4151 */
1d4b027a 4152static int set_signal_handler(void)
fac6795d 4153{
1d4b027a
DG		 4154 int ret = 0;
4155 struct sigaction sa;
4156 sigset_t sigset;
fac6795d 4157
1d4b027a
DG		 4158 if ((ret = sigemptyset(&sigset)) < 0) {
4159 perror("sigemptyset");
4160 return ret;
4161 }
d6f42150 4162
1d4b027a
DG		 4163 sa.sa_handler = sighandler;
4164 sa.sa_mask = sigset;
4165 sa.sa_flags = 0;
4166 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4167 perror("sigaction");
4168 return ret;
d6f42150
DG		 4169 }
4170
1d4b027a
DG		 4171 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4172 perror("sigaction");
4173 return ret;
d6f42150 4174 }
aaf26714 4175
1d4b027a
DG		 4176 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4177 perror("sigaction");
4178 return ret;
8c0faa1d
DG		 4179 }
4180
1d4b027a
DG		 4181 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4182
4183 return ret;
fac6795d
DG		 4184}
4185
f3ed775e 4186/*
d063d709
DG		 4187 * Set open files limit to unlimited. This daemon can open a large number of
4188 * file descriptors in order to consumer multiple kernel traces.
f3ed775e
DG		 4189 */
4190static void set_ulimit(void)
4191{
4192 int ret;
4193 struct rlimit lim;
4194
a88df331 4195 /* The kernel does not allowed an infinite limit for open files */
f3ed775e
DG		 4196 lim.rlim_cur = 65535;
4197 lim.rlim_max = 65535;
4198
4199 ret = setrlimit(RLIMIT_NOFILE, &lim);
4200 if (ret < 0) {
4201 perror("failed to set open files limit");
4202 }
4203}
4204
fac6795d
DG		 4205/*
4206 * main
4207 */
4208int main(int argc, char **argv)
4209{
fac6795d
DG		 4210 int ret = 0;
4211 void *status;
b082db07 4212 const char *home_path;
fac6795d 4213
335a95b7
MD		 4214 init_kernel_workarounds();
4215
f6a9efaa
DG		 4216 rcu_register_thread();
4217
273ea72c 4218 /* Create thread quit pipe */
cf3af59e
MD		 4219 if ((ret = init_thread_quit_pipe()) < 0) {
4220 goto error;
273ea72c
DG		 4221 }
4222
7753dea8 4223 setup_consumerd_path();
fb09408a 4224
fac6795d
DG		 4225 /* Parse arguments */
4226 progname = argv[0];
4227 if ((ret = parse_args(argc, argv) < 0)) {
cf3af59e 4228 goto error;
fac6795d
DG		 4229 }
4230
4231 /* Daemonize */
4232 if (opt_daemon) {
53094c05
DG		 4233 ret = daemon(0, 0);
4234 if (ret < 0) {
4235 perror("daemon");
cf3af59e 4236 goto error;
53094c05 4237 }
fac6795d
DG		 4238 }
4239
4240 /* Check if daemon is UID = 0 */
4241 is_root = !getuid();
4242
fac6795d 4243 if (is_root) {
990570ed 4244 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
67e40797
DG		 4245
4246 /* Create global run dir with root access */
4247 ret = create_lttng_rundir(rundir);
d6f42150 4248 if (ret < 0) {
cf3af59e 4249 goto error;
d6f42150
DG		 4250 }
4251
fac6795d 4252 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG		 4253 snprintf(apps_unix_sock_path, PATH_MAX,
4254 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG		 4255 }
4256
4257 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG		 4258 snprintf(client_unix_sock_path, PATH_MAX,
4259 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4260 }
0fdd1e2c
DG		 4261
4262 /* Set global SHM for ust */
4263 if (strlen(wait_shm_path) == 0) {
4264 snprintf(wait_shm_path, PATH_MAX,
4265 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4266 }
67e40797
DG		 4267
4268 /* Setup kernel consumerd path */
4269 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
60922cb0 4270 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
67e40797 4271 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4272 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
67e40797
DG		 4273
4274 DBG2("Kernel consumer err path: %s",
4275 kconsumer_data.err_unix_sock_path);
4276 DBG2("Kernel consumer cmd path: %s",
4277 kconsumer_data.cmd_unix_sock_path);
fac6795d 4278 } else {
b082db07
DG		 4279 home_path = get_home_dir();
4280 if (home_path == NULL) {
273ea72c
DG		 4281 /* TODO: Add --socket PATH option */
4282 ERR("Can't get HOME directory for sockets creation.");
cf3af59e
MD		 4283 ret = -EPERM;
4284 goto error;
b082db07
DG		 4285 }
4286
67e40797
DG		 4287 /*
4288 * Create rundir from home path. This will create something like
4289 * $HOME/.lttng
4290 */
990570ed 4291 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
67e40797
DG		 4292 if (ret < 0) {
4293 ret = -ENOMEM;
4294 goto error;
4295 }
4296
4297 ret = create_lttng_rundir(rundir);
4298 if (ret < 0) {
4299 goto error;
4300 }
4301
fac6795d 4302 if (strlen(apps_unix_sock_path) == 0) {
d6f42150 4303 snprintf(apps_unix_sock_path, PATH_MAX,
b082db07 4304 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
fac6795d
DG		 4305 }
4306
4307 /* Set the cli tool unix socket path */
4308 if (strlen(client_unix_sock_path) == 0) {
d6f42150 4309 snprintf(client_unix_sock_path, PATH_MAX,
b082db07 4310 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
fac6795d 4311 }
0fdd1e2c
DG		 4312
4313 /* Set global SHM for ust */
4314 if (strlen(wait_shm_path) == 0) {
4315 snprintf(wait_shm_path, PATH_MAX,
4316 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4317 }
fac6795d
DG		 4318 }
4319
847177cd
DG		 4320 DBG("Client socket path %s", client_unix_sock_path);
4321 DBG("Application socket path %s", apps_unix_sock_path);
67e40797
DG		 4322 DBG("LTTng run directory path: %s", rundir);
4323
4324 /* 32 bits consumerd path setup */
4325 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
60922cb0 4326 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
67e40797 4327 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4328 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
67e40797
DG		 4329
4330 DBG2("UST consumer 32 bits err path: %s",
4331 ustconsumer32_data.err_unix_sock_path);
4332 DBG2("UST consumer 32 bits cmd path: %s",
4333 ustconsumer32_data.cmd_unix_sock_path);
4334
4335 /* 64 bits consumerd path setup */
4336 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
60922cb0 4337 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
67e40797 4338 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
60922cb0 4339 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
67e40797
DG		 4340
4341 DBG2("UST consumer 64 bits err path: %s",
4342 ustconsumer64_data.err_unix_sock_path);
4343 DBG2("UST consumer 64 bits cmd path: %s",
4344 ustconsumer64_data.cmd_unix_sock_path);
847177cd 4345
273ea72c 4346 /*
7d8234d9 4347 * See if daemon already exist.
fac6795d 4348 */
7d8234d9 4349 if ((ret = check_existing_daemon()) < 0) {
75462a81 4350 ERR("Already running daemon.\n");
273ea72c 4351 /*
cf3af59e
MD		 4352 * We do not goto exit because we must not cleanup()
4353 * because a daemon is already running.
ab118b20 4354 */
cf3af59e 4355 goto error;
a88df331
DG		 4356 }
4357
54d01ffb 4358 /* After this point, we can safely call cleanup() with "goto exit" */
a88df331
DG		 4359
4360 /*
4361 * These actions must be executed as root. We do that *after* setting up
4362 * the sockets path because we MUST make the check for another daemon using
4363 * those paths *before* trying to set the kernel consumer sockets and init
4364 * kernel tracer.
4365 */
4366 if (is_root) {
67e40797 4367 ret = set_consumer_sockets(&kconsumer_data, rundir);
7753dea8
MD		 4368 if (ret < 0) {
4369 goto exit;
4370 }
4371
a88df331 4372 /* Setup kernel tracer */
4fba7219
DG		 4373 if (!opt_no_kernel) {
4374 init_kernel_tracer();
4375 }
a88df331
DG		 4376
4377 /* Set ulimit for open files */
4378 set_ulimit();
fac6795d
DG		 4379 }
4380
67e40797
DG		 4381 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4382 if (ret < 0) {
4383 goto exit;
4384 }
4385
4386 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4387 if (ret < 0) {
4388 goto exit;
4389 }
4390
cf3af59e
MD		 4391 if ((ret = set_signal_handler()) < 0) {
4392 goto exit;
fac6795d
DG		 4393 }
4394
d6f42150 4395 /* Setup the needed unix socket */
cf3af59e
MD		 4396 if ((ret = init_daemon_socket()) < 0) {
4397 goto exit;
fac6795d
DG		 4398 }
4399
4400 /* Set credentials to socket */
be040666 4401 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
cf3af59e 4402 goto exit;
fac6795d
DG		 4403 }
4404
5b8719f5
DG		 4405 /* Get parent pid if -S, --sig-parent is specified. */
4406 if (opt_sig_parent) {
4407 ppid = getppid();
4408 }
4409
7a485870 4410 /* Setup the kernel pipe for waking up the kernel thread */
cf3af59e
MD		 4411 if ((ret = create_kernel_poll_pipe()) < 0) {
4412 goto exit;
7a485870
DG		 4413 }
4414
099e26bd
DG		 4415 /* Setup the thread apps communication pipe. */
4416 if ((ret = create_apps_cmd_pipe()) < 0) {
4417 goto exit;
4418 }
4419
4420 /* Init UST command queue. */
4421 cds_wfq_init(&ust_cmd_queue.queue);
4422
f6a9efaa
DG		 4423 /* Init UST app hash table */
4424 ust_app_ht_alloc();
4425
273ea72c 4426 /*
54d01ffb
DG		 4427 * Get session list pointer. This pointer MUST NOT be free(). This list is
4428 * statically declared in session.c
273ea72c 4429 */
54d01ffb 4430 session_list_ptr = session_get_list();
b5541356 4431
5eb91c98
DG		 4432 /* Set up max poll set size */
4433 lttng_poll_set_max_size();
4434
cf3af59e 4435 /* Create thread to manage the client socket */
099e26bd
DG		 4436 ret = pthread_create(&client_thread, NULL,
4437 thread_manage_clients, (void *) NULL);
cf3af59e 4438 if (ret != 0) {
099e26bd 4439 perror("pthread_create clients");
cf3af59e
MD		 4440 goto exit_client;
4441 }
fac6795d 4442
099e26bd
DG		 4443 /* Create thread to dispatch registration */
4444 ret = pthread_create(&dispatch_thread, NULL,
4445 thread_dispatch_ust_registration, (void *) NULL);
4446 if (ret != 0) {
4447 perror("pthread_create dispatch");
4448 goto exit_dispatch;
4449 }
4450
4451 /* Create thread to manage application registration. */
4452 ret = pthread_create(&reg_apps_thread, NULL,
4453 thread_registration_apps, (void *) NULL);
4454 if (ret != 0) {
4455 perror("pthread_create registration");
4456 goto exit_reg_apps;
4457 }
4458
cf3af59e 4459 /* Create thread to manage application socket */
54d01ffb
DG		 4460 ret = pthread_create(&apps_thread, NULL,
4461 thread_manage_apps, (void *) NULL);
cf3af59e 4462 if (ret != 0) {
099e26bd 4463 perror("pthread_create apps");
cf3af59e
MD		 4464 goto exit_apps;
4465 }
fac6795d 4466
cf3af59e 4467 /* Create kernel thread to manage kernel event */
54d01ffb
DG		 4468 ret = pthread_create(&kernel_thread, NULL,
4469 thread_manage_kernel, (void *) NULL);
cf3af59e 4470 if (ret != 0) {
099e26bd 4471 perror("pthread_create kernel");
cf3af59e
MD		 4472 goto exit_kernel;
4473 }
7a485870 4474
cf3af59e
MD		 4475 ret = pthread_join(kernel_thread, &status);
4476 if (ret != 0) {
4477 perror("pthread_join");
4478 goto error; /* join error, exit without cleanup */
fac6795d
DG		 4479 }
4480
cf3af59e
MD		 4481exit_kernel:
4482 ret = pthread_join(apps_thread, &status);
4483 if (ret != 0) {
4484 perror("pthread_join");
4485 goto error; /* join error, exit without cleanup */
4486 }
fac6795d 4487
cf3af59e 4488exit_apps:
099e26bd
DG		 4489 ret = pthread_join(reg_apps_thread, &status);
4490 if (ret != 0) {
4491 perror("pthread_join");
4492 goto error; /* join error, exit without cleanup */
4493 }
4494
4495exit_reg_apps:
4496 ret = pthread_join(dispatch_thread, &status);
4497 if (ret != 0) {
4498 perror("pthread_join");
4499 goto error; /* join error, exit without cleanup */
4500 }
4501
4502exit_dispatch:
cf3af59e
MD		 4503 ret = pthread_join(client_thread, &status);
4504 if (ret != 0) {
4505 perror("pthread_join");
4506 goto error; /* join error, exit without cleanup */
4507 }
4508
3bd1e081 4509 ret = join_consumer_thread(&kconsumer_data);
cf3af59e 4510 if (ret != 0) {
3bd1e081 4511 perror("join_consumer");
cf3af59e
MD		 4512 goto error; /* join error, exit without cleanup */
4513 }
a88df331 4514
cf3af59e 4515exit_client:
a88df331 4516exit:
cf3af59e
MD		 4517 /*
4518 * cleanup() is called when no other thread is running.
4519 */
f6a9efaa 4520 rcu_thread_online();
cf3af59e 4521 cleanup();
f6a9efaa
DG		 4522 rcu_thread_offline();
4523 rcu_unregister_thread();
67e40797 4524 if (!ret) {
cf3af59e 4525 exit(EXIT_SUCCESS);
67e40797 4526 }
cf3af59e 4527error:
5e16da05 4528 exit(EXIT_FAILURE);
fac6795d 4529}
LTTng 2.0 tools and control repository
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