Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
0fdd1e2c | 28 | #include <sys/mman.h> |
b73401da | 29 | #include <sys/mount.h> |
1e307fab | 30 | #include <sys/resource.h> |
fac6795d DG |
31 | #include <sys/socket.h> |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
0fdd1e2c | 34 | #include <sys/wait.h> |
5c827ce0 | 35 | #include <urcu/uatomic.h> |
fac6795d | 36 | #include <unistd.h> |
3bd1e081 | 37 | #include <config.h> |
fac6795d | 38 | |
990570ed | 39 | #include <common/common.h> |
0ba98ebc | 40 | #include <common/compat/poll.h> |
d27c42b8 | 41 | #include <common/compat/socket.h> |
db758600 DG |
42 | #include <common/defaults.h> |
43 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 44 | #include <common/futex.h> |
00e2e675 | 45 | #include <common/relayd/relayd.h> |
81b86775 | 46 | #include <common/utils.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
2f77fc4b | 50 | #include "cmd.h" |
00e2e675 | 51 | #include "consumer.h" |
099e26bd | 52 | #include "context.h" |
54d01ffb | 53 | #include "event.h" |
4771f025 | 54 | #include "kernel.h" |
f1e16794 | 55 | #include "kernel-consumer.h" |
096102bd | 56 | #include "modprobe.h" |
0fdd1e2c | 57 | #include "shm.h" |
1e307fab | 58 | #include "ust-ctl.h" |
00e2e675 | 59 | #include "ust-consumer.h" |
8e68d1c8 | 60 | #include "utils.h" |
4063050c | 61 | #include "fd-limit.h" |
44a5e5eb | 62 | #include "health.h" |
8ac94142 | 63 | #include "testpoint.h" |
fac6795d | 64 | |
ebaeda94 MD |
65 | #define CONSUMERD_FILE "lttng-consumerd" |
66 | ||
75462a81 | 67 | /* Const values */ |
686204ab | 68 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 69 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
70 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
71 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
72 | ||
fac6795d DG |
73 | const char *progname; |
74 | const char *opt_tracing_group; | |
35f90c40 | 75 | static const char *opt_pidfile; |
5b8719f5 | 76 | static int opt_sig_parent; |
97e19046 | 77 | static int opt_verbose_consumer; |
fac6795d | 78 | static int opt_daemon; |
4fba7219 | 79 | static int opt_no_kernel; |
fac6795d | 80 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 81 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 82 | static char *rundir; |
3bd1e081 | 83 | |
a23ec3a7 DG |
84 | /* |
85 | * Consumer daemon specific control data. Every value not initialized here is | |
86 | * set to 0 by the static definition. | |
87 | */ | |
3bd1e081 MD |
88 | static struct consumer_data kconsumer_data = { |
89 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
90 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
91 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
92 | .err_sock = -1, |
93 | .cmd_sock = -1, | |
173af62f DG |
94 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
95 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
96 | .cond = PTHREAD_COND_INITIALIZER, |
97 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 98 | }; |
7753dea8 MD |
99 | static struct consumer_data ustconsumer64_data = { |
100 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
101 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
103 | .err_sock = -1, |
104 | .cmd_sock = -1, | |
173af62f DG |
105 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
106 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
107 | .cond = PTHREAD_COND_INITIALIZER, |
108 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
109 | }; |
110 | static struct consumer_data ustconsumer32_data = { | |
111 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
112 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
113 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
114 | .err_sock = -1, |
115 | .cmd_sock = -1, | |
173af62f DG |
116 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
117 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
118 | .cond = PTHREAD_COND_INITIALIZER, |
119 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
120 | }; |
121 | ||
26c9d55e | 122 | /* Shared between threads */ |
099e26bd | 123 | static int dispatch_thread_exit; |
fac6795d | 124 | |
54d01ffb DG |
125 | /* Global application Unix socket path */ |
126 | static char apps_unix_sock_path[PATH_MAX]; | |
127 | /* Global client Unix socket path */ | |
128 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
129 | /* global wait shm path for UST */ |
130 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
131 | /* Global health check unix path */ |
132 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 133 | |
1d4b027a | 134 | /* Sockets and FDs */ |
a4b35e07 MD |
135 | static int client_sock = -1; |
136 | static int apps_sock = -1; | |
2f77fc4b | 137 | int kernel_tracer_fd = -1; |
76d7553f | 138 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 139 | |
273ea72c DG |
140 | /* |
141 | * Quit pipe for all threads. This permits a single cancellation point | |
142 | * for all threads when receiving an event on the pipe. | |
143 | */ | |
76d7553f | 144 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 145 | |
099e26bd DG |
146 | /* |
147 | * This pipe is used to inform the thread managing application communication | |
148 | * that a command is queued and ready to be processed. | |
149 | */ | |
76d7553f | 150 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 151 | |
1d4b027a | 152 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 153 | static pthread_t apps_thread; |
099e26bd | 154 | static pthread_t reg_apps_thread; |
1d4b027a | 155 | static pthread_t client_thread; |
7a485870 | 156 | static pthread_t kernel_thread; |
099e26bd | 157 | static pthread_t dispatch_thread; |
44a5e5eb | 158 | static pthread_t health_thread; |
5eb91c98 | 159 | |
099e26bd DG |
160 | /* |
161 | * UST registration command queue. This queue is tied with a futex and uses a N | |
162 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
163 | * | |
164 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
165 | * this queue and the wait/wake scheme. | |
166 | */ | |
167 | static struct ust_cmd_queue ust_cmd_queue; | |
168 | ||
b5541356 DG |
169 | /* |
170 | * Pointer initialized before thread creation. | |
171 | * | |
172 | * This points to the tracing session list containing the session count and a | |
173 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
174 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 175 | * |
d063d709 | 176 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 177 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
178 | */ |
179 | static struct ltt_session_list *session_list_ptr; | |
180 | ||
7753dea8 MD |
181 | int ust_consumerd64_fd = -1; |
182 | int ust_consumerd32_fd = -1; | |
183 | ||
fb6f1fa2 YB |
184 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
185 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
186 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
187 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 188 | |
2f77fc4b DG |
189 | static const char *module_proc_lttng = "/proc/lttng"; |
190 | ||
5c827ce0 DG |
191 | /* |
192 | * Consumer daemon state which is changed when spawning it, killing it or in | |
193 | * case of a fatal error. | |
194 | */ | |
195 | enum consumerd_state { | |
196 | CONSUMER_STARTED = 1, | |
197 | CONSUMER_STOPPED = 2, | |
198 | CONSUMER_ERROR = 3, | |
199 | }; | |
200 | ||
201 | /* | |
202 | * This consumer daemon state is used to validate if a client command will be | |
203 | * able to reach the consumer. If not, the client is informed. For instance, | |
204 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
205 | * error to the client. | |
206 | * | |
207 | * The following example shows a possible race condition of this scheme: | |
208 | * | |
209 | * consumer thread error happens | |
210 | * client cmd arrives | |
211 | * client cmd checks state -> still OK | |
212 | * consumer thread exit, sets error | |
213 | * client cmd try to talk to consumer | |
214 | * ... | |
215 | * | |
216 | * However, since the consumer is a different daemon, we have no way of making | |
217 | * sure the command will reach it safely even with this state flag. This is why | |
218 | * we consider that up to the state validation during command processing, the | |
219 | * command is safe. After that, we can not guarantee the correctness of the | |
220 | * client request vis-a-vis the consumer. | |
221 | */ | |
222 | static enum consumerd_state ust_consumerd_state; | |
223 | static enum consumerd_state kernel_consumerd_state; | |
224 | ||
ae9e45b3 DG |
225 | /* |
226 | * Socket timeout for receiving and sending in seconds. | |
227 | */ | |
228 | static int app_socket_timeout; | |
229 | ||
fb09408a | 230 | static |
7753dea8 | 231 | void setup_consumerd_path(void) |
fb09408a | 232 | { |
fc7a59ce | 233 | const char *bin, *libdir; |
fb09408a | 234 | |
7753dea8 MD |
235 | /* |
236 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
237 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
238 | * has not been defined. | |
7753dea8 | 239 | */ |
ebaeda94 | 240 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
241 | if (!consumerd32_bin[0]) { |
242 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
243 | } |
244 | if (!consumerd32_libdir[0]) { | |
245 | consumerd32_libdir = INSTALL_LIB_PATH; | |
246 | } | |
247 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
248 | if (!consumerd64_bin[0]) { |
249 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 250 | } |
ebaeda94 MD |
251 | if (!consumerd64_libdir[0]) { |
252 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
253 | } |
254 | #else | |
255 | #error "Unknown bitness" | |
256 | #endif | |
257 | ||
fb09408a MD |
258 | /* |
259 | * runtime env. var. overrides the build default. | |
260 | */ | |
fc7a59ce AM |
261 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
262 | if (bin) { | |
263 | consumerd32_bin = bin; | |
7753dea8 | 264 | } |
fc7a59ce AM |
265 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
266 | if (bin) { | |
267 | consumerd64_bin = bin; | |
ebaeda94 | 268 | } |
72f579ee | 269 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
270 | if (libdir) { |
271 | consumerd32_libdir = libdir; | |
272 | } | |
72f579ee | 273 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
274 | if (libdir) { |
275 | consumerd64_libdir = libdir; | |
fb09408a MD |
276 | } |
277 | } | |
278 | ||
5eb91c98 DG |
279 | /* |
280 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
281 | */ | |
282 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
283 | unsigned int size) | |
284 | { | |
285 | int ret; | |
286 | ||
287 | if (events == NULL || size == 0) { | |
288 | ret = -1; | |
289 | goto error; | |
290 | } | |
291 | ||
292 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
293 | if (ret < 0) { | |
294 | goto error; | |
295 | } | |
296 | ||
297 | /* Add quit pipe */ | |
298 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
299 | if (ret < 0) { | |
300 | goto error; | |
301 | } | |
302 | ||
303 | return 0; | |
304 | ||
305 | error: | |
306 | return ret; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Check if the thread quit pipe was triggered. | |
311 | * | |
312 | * Return 1 if it was triggered else 0; | |
313 | */ | |
314 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
315 | { | |
316 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
317 | return 1; | |
318 | } | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
0fdd1e2c DG |
323 | /* |
324 | * Return group ID of the tracing group or -1 if not found. | |
325 | */ | |
996b65c8 MD |
326 | static gid_t allowed_group(void) |
327 | { | |
328 | struct group *grp; | |
329 | ||
274e143b MD |
330 | if (opt_tracing_group) { |
331 | grp = getgrnam(opt_tracing_group); | |
332 | } else { | |
333 | grp = getgrnam(default_tracing_group); | |
334 | } | |
996b65c8 MD |
335 | if (!grp) { |
336 | return -1; | |
337 | } else { | |
338 | return grp->gr_gid; | |
339 | } | |
340 | } | |
341 | ||
273ea72c | 342 | /* |
5eb91c98 | 343 | * Init thread quit pipe. |
273ea72c DG |
344 | * |
345 | * Return -1 on error or 0 if all pipes are created. | |
346 | */ | |
347 | static int init_thread_quit_pipe(void) | |
348 | { | |
730389d9 | 349 | int ret, i; |
273ea72c | 350 | |
730389d9 | 351 | ret = pipe(thread_quit_pipe); |
273ea72c | 352 | if (ret < 0) { |
730389d9 | 353 | PERROR("thread quit pipe"); |
273ea72c DG |
354 | goto error; |
355 | } | |
356 | ||
730389d9 DG |
357 | for (i = 0; i < 2; i++) { |
358 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
359 | if (ret < 0) { | |
360 | PERROR("fcntl"); | |
361 | goto error; | |
362 | } | |
363 | } | |
364 | ||
273ea72c DG |
365 | error: |
366 | return ret; | |
367 | } | |
368 | ||
099e26bd DG |
369 | /* |
370 | * Stop all threads by closing the thread quit pipe. | |
371 | */ | |
cf3af59e MD |
372 | static void stop_threads(void) |
373 | { | |
5eb91c98 DG |
374 | int ret; |
375 | ||
cf3af59e MD |
376 | /* Stopping all threads */ |
377 | DBG("Terminating all threads"); | |
54d01ffb | 378 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
379 | if (ret < 0) { |
380 | ERR("write error on thread quit pipe"); | |
381 | } | |
382 | ||
099e26bd | 383 | /* Dispatch thread */ |
26c9d55e | 384 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 385 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
386 | } |
387 | ||
fac6795d | 388 | /* |
d063d709 | 389 | * Cleanup the daemon |
fac6795d | 390 | */ |
cf3af59e | 391 | static void cleanup(void) |
fac6795d | 392 | { |
ef599319 | 393 | int ret; |
6620da75 | 394 | char *cmd = NULL; |
af9737e9 | 395 | struct ltt_session *sess, *stmp; |
fac6795d | 396 | |
1d4b027a | 397 | DBG("Cleaning up"); |
e07ae692 | 398 | |
2f77fc4b DG |
399 | /* First thing first, stop all threads */ |
400 | utils_close_pipe(thread_quit_pipe); | |
401 | ||
35f90c40 DG |
402 | /* |
403 | * If opt_pidfile is undefined, the default file will be wiped when | |
404 | * removing the rundir. | |
405 | */ | |
406 | if (opt_pidfile) { | |
407 | ret = remove(opt_pidfile); | |
408 | if (ret < 0) { | |
409 | PERROR("remove pidfile %s", opt_pidfile); | |
410 | } | |
411 | } | |
412 | ||
67e40797 DG |
413 | DBG("Removing %s directory", rundir); |
414 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
415 | if (ret < 0) { | |
416 | ERR("asprintf failed. Something is really wrong!"); | |
417 | } | |
5461b305 | 418 | |
67e40797 DG |
419 | /* Remove lttng run directory */ |
420 | ret = system(cmd); | |
421 | if (ret < 0) { | |
422 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 423 | } |
67e40797 | 424 | free(cmd); |
bd69add2 | 425 | free(rundir); |
5461b305 | 426 | |
99bab54f | 427 | DBG("Cleaning up all sessions"); |
fac6795d | 428 | |
b5541356 | 429 | /* Destroy session list mutex */ |
273ea72c DG |
430 | if (session_list_ptr != NULL) { |
431 | pthread_mutex_destroy(&session_list_ptr->lock); | |
432 | ||
433 | /* Cleanup ALL session */ | |
54d01ffb DG |
434 | cds_list_for_each_entry_safe(sess, stmp, |
435 | &session_list_ptr->head, list) { | |
2f77fc4b | 436 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
437 | } |
438 | } | |
439 | ||
099e26bd | 440 | DBG("Closing all UST sockets"); |
56fff090 | 441 | ust_app_clean_list(); |
099e26bd | 442 | |
4fba7219 DG |
443 | if (is_root && !opt_no_kernel) { |
444 | DBG2("Closing kernel fd"); | |
a4b35e07 | 445 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
446 | ret = close(kernel_tracer_fd); |
447 | if (ret) { | |
448 | PERROR("close"); | |
449 | } | |
a4b35e07 | 450 | } |
2f50c8a3 | 451 | DBG("Unloading kernel modules"); |
096102bd | 452 | modprobe_remove_lttng_all(); |
2f50c8a3 | 453 | } |
2f77fc4b | 454 | |
421cb601 | 455 | /* <fun> */ |
f56a39af | 456 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
457 | "Matthew, BEET driven development works!%c[%dm", |
458 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
459 | /* </fun> */ | |
fac6795d DG |
460 | } |
461 | ||
e065084a | 462 | /* |
d063d709 | 463 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 464 | * |
d063d709 | 465 | * Return lttcomm error code. |
e065084a DG |
466 | */ |
467 | static int send_unix_sock(int sock, void *buf, size_t len) | |
468 | { | |
469 | /* Check valid length */ | |
c617c0c6 | 470 | if (len == 0) { |
e065084a DG |
471 | return -1; |
472 | } | |
473 | ||
474 | return lttcomm_send_unix_sock(sock, buf, len); | |
475 | } | |
476 | ||
5461b305 | 477 | /* |
d063d709 | 478 | * Free memory of a command context structure. |
5461b305 | 479 | */ |
a2fb29a5 | 480 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 481 | { |
a2fb29a5 DG |
482 | DBG("Clean command context structure"); |
483 | if (*cmd_ctx) { | |
484 | if ((*cmd_ctx)->llm) { | |
485 | free((*cmd_ctx)->llm); | |
5461b305 | 486 | } |
a2fb29a5 DG |
487 | if ((*cmd_ctx)->lsm) { |
488 | free((*cmd_ctx)->lsm); | |
5461b305 | 489 | } |
a2fb29a5 DG |
490 | free(*cmd_ctx); |
491 | *cmd_ctx = NULL; | |
5461b305 DG |
492 | } |
493 | } | |
494 | ||
fac6795d | 495 | /* |
0fdd1e2c | 496 | * Notify UST applications using the shm mmap futex. |
fac6795d | 497 | */ |
0fdd1e2c | 498 | static int notify_ust_apps(int active) |
fac6795d | 499 | { |
0fdd1e2c | 500 | char *wait_shm_mmap; |
fac6795d | 501 | |
0fdd1e2c | 502 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 503 | |
0fdd1e2c DG |
504 | /* See shm.c for this call implying mmap, shm and futex calls */ |
505 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
506 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
507 | goto error; |
508 | } | |
509 | ||
0fdd1e2c DG |
510 | /* Wake waiting process */ |
511 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
512 | ||
513 | /* Apps notified successfully */ | |
514 | return 0; | |
fac6795d DG |
515 | |
516 | error: | |
0fdd1e2c | 517 | return -1; |
fac6795d DG |
518 | } |
519 | ||
e065084a | 520 | /* |
d063d709 DG |
521 | * Setup the outgoing data buffer for the response (llm) by allocating the |
522 | * right amount of memory and copying the original information from the lsm | |
523 | * structure. | |
ca95a216 | 524 | * |
d063d709 | 525 | * Return total size of the buffer pointed by buf. |
ca95a216 | 526 | */ |
5461b305 | 527 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 528 | { |
f3ed775e | 529 | int ret, buf_size; |
ca95a216 | 530 | |
f3ed775e | 531 | buf_size = size; |
5461b305 | 532 | |
ba7f0ae5 | 533 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 534 | if (cmd_ctx->llm == NULL) { |
76d7553f | 535 | PERROR("zmalloc"); |
5461b305 | 536 | ret = -ENOMEM; |
ca95a216 DG |
537 | goto error; |
538 | } | |
539 | ||
5461b305 DG |
540 | /* Copy common data */ |
541 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 542 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 543 | |
5461b305 DG |
544 | cmd_ctx->llm->data_size = size; |
545 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
546 | ||
ca95a216 DG |
547 | return buf_size; |
548 | ||
549 | error: | |
550 | return ret; | |
551 | } | |
552 | ||
7a485870 | 553 | /* |
5eb91c98 | 554 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 555 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 556 | */ |
5eb91c98 | 557 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 558 | { |
5eb91c98 | 559 | int ret; |
7a485870 DG |
560 | struct ltt_session *session; |
561 | struct ltt_kernel_channel *channel; | |
562 | ||
5eb91c98 | 563 | DBG("Updating kernel poll set"); |
7a485870 | 564 | |
54d01ffb | 565 | session_lock_list(); |
b5541356 | 566 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 567 | session_lock(session); |
7a485870 | 568 | if (session->kernel_session == NULL) { |
54d01ffb | 569 | session_unlock(session); |
7a485870 DG |
570 | continue; |
571 | } | |
7a485870 | 572 | |
54d01ffb DG |
573 | cds_list_for_each_entry(channel, |
574 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
575 | /* Add channel fd to the kernel poll set */ |
576 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
577 | if (ret < 0) { | |
54d01ffb | 578 | session_unlock(session); |
5eb91c98 DG |
579 | goto error; |
580 | } | |
581 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 582 | } |
54d01ffb | 583 | session_unlock(session); |
7a485870 | 584 | } |
54d01ffb | 585 | session_unlock_list(); |
7a485870 | 586 | |
5eb91c98 | 587 | return 0; |
7a485870 DG |
588 | |
589 | error: | |
54d01ffb | 590 | session_unlock_list(); |
7a485870 DG |
591 | return -1; |
592 | } | |
593 | ||
594 | /* | |
54d01ffb | 595 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 596 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 597 | * |
d063d709 | 598 | * Useful for CPU hotplug feature. |
7a485870 | 599 | */ |
2bdd86d4 | 600 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
601 | { |
602 | int ret = 0; | |
603 | struct ltt_session *session; | |
173af62f | 604 | struct ltt_kernel_session *ksess; |
7a485870 DG |
605 | struct ltt_kernel_channel *channel; |
606 | ||
607 | DBG("Updating kernel streams for channel fd %d", fd); | |
608 | ||
54d01ffb | 609 | session_lock_list(); |
b5541356 | 610 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 611 | session_lock(session); |
7a485870 | 612 | if (session->kernel_session == NULL) { |
54d01ffb | 613 | session_unlock(session); |
7a485870 DG |
614 | continue; |
615 | } | |
173af62f | 616 | ksess = session->kernel_session; |
d9800920 | 617 | |
173af62f | 618 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
619 | if (channel->fd == fd) { |
620 | DBG("Channel found, updating kernel streams"); | |
621 | ret = kernel_open_channel_stream(channel); | |
622 | if (ret < 0) { | |
b3c750d2 | 623 | goto error; |
7a485870 | 624 | } |
d9800920 | 625 | |
7a485870 | 626 | /* |
5eb91c98 DG |
627 | * Have we already sent fds to the consumer? If yes, it means |
628 | * that tracing is started so it is safe to send our updated | |
629 | * stream fds. | |
7a485870 | 630 | */ |
173af62f DG |
631 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
632 | struct lttng_ht_iter iter; | |
633 | struct consumer_socket *socket; | |
634 | ||
e7fe706f | 635 | rcu_read_lock(); |
173af62f DG |
636 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
637 | &iter.iter, socket, node.node) { | |
638 | /* Code flow error */ | |
639 | assert(socket->fd >= 0); | |
640 | ||
641 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 642 | ret = kernel_consumer_send_channel_stream(socket, |
173af62f DG |
643 | channel, ksess); |
644 | pthread_mutex_unlock(socket->lock); | |
645 | if (ret < 0) { | |
e7fe706f | 646 | rcu_read_unlock(); |
173af62f DG |
647 | goto error; |
648 | } | |
7a485870 | 649 | } |
e7fe706f | 650 | rcu_read_unlock(); |
7a485870 | 651 | } |
b3c750d2 | 652 | goto error; |
7a485870 DG |
653 | } |
654 | } | |
54d01ffb | 655 | session_unlock(session); |
7a485870 | 656 | } |
54d01ffb | 657 | session_unlock_list(); |
b3c750d2 | 658 | return ret; |
7a485870 | 659 | |
b3c750d2 | 660 | error: |
54d01ffb DG |
661 | session_unlock(session); |
662 | session_unlock_list(); | |
7a485870 DG |
663 | return ret; |
664 | } | |
665 | ||
487cf67c DG |
666 | /* |
667 | * For each tracing session, update newly registered apps. | |
668 | */ | |
669 | static void update_ust_app(int app_sock) | |
670 | { | |
671 | struct ltt_session *sess, *stmp; | |
672 | ||
4ee14516 DG |
673 | session_lock_list(); |
674 | ||
487cf67c DG |
675 | /* For all tracing session(s) */ |
676 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 677 | session_lock(sess); |
421cb601 DG |
678 | if (sess->ust_session) { |
679 | ust_app_global_update(sess->ust_session, app_sock); | |
680 | } | |
4ee14516 | 681 | session_unlock(sess); |
487cf67c | 682 | } |
4ee14516 DG |
683 | |
684 | session_unlock_list(); | |
487cf67c DG |
685 | } |
686 | ||
7a485870 | 687 | /* |
d063d709 | 688 | * This thread manage event coming from the kernel. |
7a485870 | 689 | * |
d063d709 DG |
690 | * Features supported in this thread: |
691 | * -) CPU Hotplug | |
7a485870 DG |
692 | */ |
693 | static void *thread_manage_kernel(void *data) | |
694 | { | |
139ac872 | 695 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 696 | uint32_t revents, nb_fd; |
7a485870 | 697 | char tmp; |
5eb91c98 | 698 | struct lttng_poll_event events; |
7a485870 | 699 | |
6993eeb3 | 700 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 701 | |
927ca06a DG |
702 | health_register(HEALTH_TYPE_KERNEL); |
703 | ||
d5d63bf1 DG |
704 | /* |
705 | * This first step of the while is to clean this structure which could free | |
706 | * non NULL pointers so zero it before the loop. | |
707 | */ | |
708 | memset(&events, 0, sizeof(events)); | |
709 | ||
6993eeb3 CB |
710 | if (testpoint(thread_manage_kernel)) { |
711 | goto error_testpoint; | |
712 | } | |
8ac94142 | 713 | |
840cb59c | 714 | health_code_update(); |
44a5e5eb | 715 | |
6993eeb3 | 716 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 717 | goto error_testpoint; |
6993eeb3 CB |
718 | } |
719 | ||
7a485870 | 720 | while (1) { |
840cb59c | 721 | health_code_update(); |
44a5e5eb | 722 | |
7a485870 | 723 | if (update_poll_flag == 1) { |
d21b0d71 DG |
724 | /* Clean events object. We are about to populate it again. */ |
725 | lttng_poll_clean(&events); | |
726 | ||
727 | ret = create_thread_poll_set(&events, 2); | |
728 | if (ret < 0) { | |
729 | goto error_poll_create; | |
730 | } | |
731 | ||
732 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
733 | if (ret < 0) { | |
734 | goto error; | |
735 | } | |
5f822d0a | 736 | |
d21b0d71 | 737 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
738 | ret = update_kernel_poll(&events); |
739 | if (ret < 0) { | |
7a485870 DG |
740 | goto error; |
741 | } | |
742 | update_poll_flag = 0; | |
743 | } | |
744 | ||
d21b0d71 | 745 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
746 | |
747 | /* Poll infinite value of time */ | |
88f2b785 | 748 | restart: |
840cb59c | 749 | health_poll_update(); |
5eb91c98 | 750 | ret = lttng_poll_wait(&events, -1); |
840cb59c | 751 | health_poll_update(); |
7a485870 | 752 | if (ret < 0) { |
88f2b785 MD |
753 | /* |
754 | * Restart interrupted system call. | |
755 | */ | |
756 | if (errno == EINTR) { | |
757 | goto restart; | |
758 | } | |
7a485870 DG |
759 | goto error; |
760 | } else if (ret == 0) { | |
761 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
762 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
763 | "This should not have happened! Continuing..."); | |
7a485870 DG |
764 | continue; |
765 | } | |
766 | ||
0d9c5d77 DG |
767 | nb_fd = ret; |
768 | ||
5eb91c98 DG |
769 | for (i = 0; i < nb_fd; i++) { |
770 | /* Fetch once the poll data */ | |
771 | revents = LTTNG_POLL_GETEV(&events, i); | |
772 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 773 | |
840cb59c | 774 | health_code_update(); |
44a5e5eb | 775 | |
5eb91c98 DG |
776 | /* Thread quit pipe has been closed. Killing thread. */ |
777 | ret = check_thread_quit_pipe(pollfd, revents); | |
778 | if (ret) { | |
139ac872 MD |
779 | err = 0; |
780 | goto exit; | |
5eb91c98 | 781 | } |
7a485870 | 782 | |
5eb91c98 DG |
783 | /* Check for data on kernel pipe */ |
784 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
785 | do { |
786 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
787 | } while (ret < 0 && errno == EINTR); | |
788 | /* | |
789 | * Ret value is useless here, if this pipe gets any actions an | |
790 | * update is required anyway. | |
791 | */ | |
5eb91c98 DG |
792 | update_poll_flag = 1; |
793 | continue; | |
794 | } else { | |
795 | /* | |
796 | * New CPU detected by the kernel. Adding kernel stream to | |
797 | * kernel session and updating the kernel consumer | |
798 | */ | |
799 | if (revents & LPOLLIN) { | |
2bdd86d4 | 800 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
801 | if (ret < 0) { |
802 | continue; | |
803 | } | |
804 | break; | |
805 | /* | |
806 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
807 | * and unregister kernel stream at this point. | |
808 | */ | |
7a485870 | 809 | } |
7a485870 DG |
810 | } |
811 | } | |
812 | } | |
813 | ||
139ac872 | 814 | exit: |
7a485870 | 815 | error: |
5eb91c98 | 816 | lttng_poll_clean(&events); |
76d7553f | 817 | error_poll_create: |
6993eeb3 | 818 | error_testpoint: |
6620da75 DG |
819 | utils_close_pipe(kernel_poll_pipe); |
820 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 821 | if (err) { |
840cb59c | 822 | health_error(); |
139ac872 | 823 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
824 | WARN("Kernel thread died unexpectedly. " |
825 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 826 | } |
927ca06a | 827 | health_unregister(); |
76d7553f | 828 | DBG("Kernel thread dying"); |
7a485870 DG |
829 | return NULL; |
830 | } | |
831 | ||
a23ec3a7 DG |
832 | /* |
833 | * Signal pthread condition of the consumer data that the thread. | |
834 | */ | |
835 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
836 | { | |
837 | pthread_mutex_lock(&data->cond_mutex); | |
838 | ||
839 | /* | |
840 | * The state is set before signaling. It can be any value, it's the waiter | |
841 | * job to correctly interpret this condition variable associated to the | |
842 | * consumer pthread_cond. | |
843 | * | |
844 | * A value of 0 means that the corresponding thread of the consumer data | |
845 | * was not started. 1 indicates that the thread has started and is ready | |
846 | * for action. A negative value means that there was an error during the | |
847 | * thread bootstrap. | |
848 | */ | |
849 | data->consumer_thread_is_ready = state; | |
850 | (void) pthread_cond_signal(&data->cond); | |
851 | ||
852 | pthread_mutex_unlock(&data->cond_mutex); | |
853 | } | |
854 | ||
1d4b027a | 855 | /* |
3bd1e081 | 856 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 857 | */ |
3bd1e081 | 858 | static void *thread_manage_consumer(void *data) |
1d4b027a | 859 | { |
139ac872 | 860 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 861 | uint32_t revents, nb_fd; |
1d4b027a | 862 | enum lttcomm_return_code code; |
5eb91c98 | 863 | struct lttng_poll_event events; |
3bd1e081 | 864 | struct consumer_data *consumer_data = data; |
1d4b027a | 865 | |
3bd1e081 | 866 | DBG("[thread] Manage consumer started"); |
1d4b027a | 867 | |
927ca06a DG |
868 | health_register(HEALTH_TYPE_CONSUMER); |
869 | ||
9449cc75 DG |
870 | /* |
871 | * Since the consumer thread can be spawned at any moment in time, we init | |
872 | * the health to a poll status (1, which is a valid health over time). | |
873 | * When the thread starts, we update here the health to a "code" path being | |
874 | * an even value so this thread, when reaching a poll wait, does not | |
875 | * trigger an error with an even value. | |
876 | * | |
877 | * Here is the use case we avoid. | |
878 | * | |
879 | * +1: the first poll update during initialization (main()) | |
880 | * +2 * x: multiple code update once in this thread. | |
881 | * +1: poll wait in this thread (being a good health state). | |
882 | * == even number which after the wait period shows as a bad health. | |
883 | * | |
884 | * In a nutshell, the following poll update to the health state brings back | |
885 | * the state to an even value meaning a code path. | |
886 | */ | |
840cb59c | 887 | health_poll_update(); |
9449cc75 | 888 | |
5eb91c98 DG |
889 | /* |
890 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
891 | * Nothing more will be added to this poll set. | |
892 | */ | |
893 | ret = create_thread_poll_set(&events, 2); | |
894 | if (ret < 0) { | |
76d7553f | 895 | goto error_poll; |
5eb91c98 | 896 | } |
273ea72c | 897 | |
edb8b045 DG |
898 | /* |
899 | * The error socket here is already in a listening state which was done | |
900 | * just before spawning this thread to avoid a race between the consumer | |
901 | * daemon exec trying to connect and the listen() call. | |
902 | */ | |
3bd1e081 | 903 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
904 | if (ret < 0) { |
905 | goto error; | |
906 | } | |
907 | ||
840cb59c | 908 | health_code_update(); |
44a5e5eb | 909 | |
273ea72c | 910 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 911 | restart: |
840cb59c | 912 | health_poll_update(); |
8ac94142 | 913 | |
6993eeb3 CB |
914 | if (testpoint(thread_manage_consumer)) { |
915 | goto error; | |
916 | } | |
8ac94142 | 917 | |
5eb91c98 | 918 | ret = lttng_poll_wait(&events, -1); |
840cb59c | 919 | health_poll_update(); |
273ea72c | 920 | if (ret < 0) { |
88f2b785 MD |
921 | /* |
922 | * Restart interrupted system call. | |
923 | */ | |
924 | if (errno == EINTR) { | |
925 | goto restart; | |
926 | } | |
273ea72c DG |
927 | goto error; |
928 | } | |
929 | ||
0d9c5d77 DG |
930 | nb_fd = ret; |
931 | ||
5eb91c98 DG |
932 | for (i = 0; i < nb_fd; i++) { |
933 | /* Fetch once the poll data */ | |
934 | revents = LTTNG_POLL_GETEV(&events, i); | |
935 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
936 | ||
840cb59c | 937 | health_code_update(); |
44a5e5eb | 938 | |
5eb91c98 DG |
939 | /* Thread quit pipe has been closed. Killing thread. */ |
940 | ret = check_thread_quit_pipe(pollfd, revents); | |
941 | if (ret) { | |
139ac872 MD |
942 | err = 0; |
943 | goto exit; | |
5eb91c98 DG |
944 | } |
945 | ||
946 | /* Event on the registration socket */ | |
3bd1e081 | 947 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 948 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 949 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
950 | goto error; |
951 | } | |
952 | } | |
273ea72c DG |
953 | } |
954 | ||
3bd1e081 | 955 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
956 | if (sock < 0) { |
957 | goto error; | |
958 | } | |
959 | ||
b662582b DG |
960 | /* |
961 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
962 | * show must go on. | |
963 | */ | |
964 | (void) utils_set_fd_cloexec(sock); | |
965 | ||
840cb59c | 966 | health_code_update(); |
44a5e5eb | 967 | |
3bd1e081 | 968 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 969 | |
712ea556 | 970 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
971 | ret = lttcomm_recv_unix_sock(sock, &code, |
972 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
973 | if (ret <= 0) { |
974 | goto error; | |
975 | } | |
976 | ||
840cb59c | 977 | health_code_update(); |
44a5e5eb | 978 | |
f73fabfd | 979 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 MD |
980 | consumer_data->cmd_sock = |
981 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
982 | if (consumer_data->cmd_sock < 0) { | |
a23ec3a7 DG |
983 | /* On error, signal condition and quit. */ |
984 | signal_consumer_condition(consumer_data, -1); | |
48842b30 | 985 | PERROR("consumer connect"); |
1d4b027a DG |
986 | goto error; |
987 | } | |
a23ec3a7 DG |
988 | signal_consumer_condition(consumer_data, 1); |
989 | DBG("Consumer command socket ready"); | |
1d4b027a | 990 | } else { |
3bd1e081 | 991 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
992 | lttcomm_get_readable_code(-code)); |
993 | goto error; | |
994 | } | |
995 | ||
54d01ffb | 996 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 997 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 998 | if (ret < 0) { |
72079cae DG |
999 | goto error; |
1000 | } | |
1001 | ||
5eb91c98 DG |
1002 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1003 | if (ret < 0) { | |
72079cae | 1004 | goto error; |
5eb91c98 DG |
1005 | } |
1006 | ||
840cb59c | 1007 | health_code_update(); |
44a5e5eb | 1008 | |
5eb91c98 | 1009 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1010 | restart_poll: |
840cb59c | 1011 | health_poll_update(); |
5eb91c98 | 1012 | ret = lttng_poll_wait(&events, -1); |
840cb59c | 1013 | health_poll_update(); |
5eb91c98 | 1014 | if (ret < 0) { |
88f2b785 MD |
1015 | /* |
1016 | * Restart interrupted system call. | |
1017 | */ | |
1018 | if (errno == EINTR) { | |
1019 | goto restart_poll; | |
1020 | } | |
72079cae DG |
1021 | goto error; |
1022 | } | |
1023 | ||
0d9c5d77 DG |
1024 | nb_fd = ret; |
1025 | ||
5eb91c98 DG |
1026 | for (i = 0; i < nb_fd; i++) { |
1027 | /* Fetch once the poll data */ | |
1028 | revents = LTTNG_POLL_GETEV(&events, i); | |
1029 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1030 | ||
840cb59c | 1031 | health_code_update(); |
44a5e5eb | 1032 | |
5eb91c98 DG |
1033 | /* Thread quit pipe has been closed. Killing thread. */ |
1034 | ret = check_thread_quit_pipe(pollfd, revents); | |
1035 | if (ret) { | |
139ac872 MD |
1036 | err = 0; |
1037 | goto exit; | |
5eb91c98 DG |
1038 | } |
1039 | ||
1040 | /* Event on the kconsumerd socket */ | |
1041 | if (pollfd == sock) { | |
1042 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1043 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1044 | goto error; |
1045 | } | |
1046 | } | |
1047 | } | |
1048 | ||
840cb59c | 1049 | health_code_update(); |
44a5e5eb | 1050 | |
712ea556 | 1051 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1052 | ret = lttcomm_recv_unix_sock(sock, &code, |
1053 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1054 | if (ret <= 0) { |
3bd1e081 | 1055 | ERR("consumer closed the command socket"); |
712ea556 | 1056 | goto error; |
6f61d021 | 1057 | } |
1d4b027a | 1058 | |
3bd1e081 | 1059 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1060 | |
139ac872 | 1061 | exit: |
1d4b027a | 1062 | error: |
5c827ce0 DG |
1063 | /* Immediately set the consumerd state to stopped */ |
1064 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1065 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1066 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1067 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1068 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1069 | } else { | |
1070 | /* Code flow error... */ | |
1071 | assert(0); | |
1072 | } | |
1073 | ||
76d7553f MD |
1074 | if (consumer_data->err_sock >= 0) { |
1075 | ret = close(consumer_data->err_sock); | |
1076 | if (ret) { | |
1077 | PERROR("close"); | |
1078 | } | |
1079 | } | |
1080 | if (consumer_data->cmd_sock >= 0) { | |
1081 | ret = close(consumer_data->cmd_sock); | |
1082 | if (ret) { | |
1083 | PERROR("close"); | |
1084 | } | |
1085 | } | |
1086 | if (sock >= 0) { | |
1087 | ret = close(sock); | |
1088 | if (ret) { | |
1089 | PERROR("close"); | |
1090 | } | |
1091 | } | |
273ea72c | 1092 | |
3bd1e081 MD |
1093 | unlink(consumer_data->err_unix_sock_path); |
1094 | unlink(consumer_data->cmd_unix_sock_path); | |
1095 | consumer_data->pid = 0; | |
1d4b027a | 1096 | |
5eb91c98 | 1097 | lttng_poll_clean(&events); |
76d7553f | 1098 | error_poll: |
139ac872 | 1099 | if (err) { |
840cb59c | 1100 | health_error(); |
139ac872 MD |
1101 | ERR("Health error occurred in %s", __func__); |
1102 | } | |
927ca06a | 1103 | health_unregister(); |
76d7553f | 1104 | DBG("consumer thread cleanup completed"); |
0177d773 | 1105 | |
5eb91c98 | 1106 | return NULL; |
099e26bd DG |
1107 | } |
1108 | ||
099e26bd DG |
1109 | /* |
1110 | * This thread manage application communication. | |
1d4b027a DG |
1111 | */ |
1112 | static void *thread_manage_apps(void *data) | |
099e26bd | 1113 | { |
139ac872 | 1114 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1115 | uint32_t revents, nb_fd; |
099e26bd | 1116 | struct ust_command ust_cmd; |
5eb91c98 | 1117 | struct lttng_poll_event events; |
099e26bd DG |
1118 | |
1119 | DBG("[thread] Manage application started"); | |
1120 | ||
f6a9efaa DG |
1121 | rcu_register_thread(); |
1122 | rcu_thread_online(); | |
1123 | ||
927ca06a DG |
1124 | health_register(HEALTH_TYPE_APP_MANAGE); |
1125 | ||
6993eeb3 CB |
1126 | if (testpoint(thread_manage_apps)) { |
1127 | goto error_testpoint; | |
1128 | } | |
1129 | ||
840cb59c | 1130 | health_code_update(); |
44a5e5eb | 1131 | |
5eb91c98 DG |
1132 | ret = create_thread_poll_set(&events, 2); |
1133 | if (ret < 0) { | |
76d7553f | 1134 | goto error_poll_create; |
5eb91c98 | 1135 | } |
099e26bd | 1136 | |
5eb91c98 DG |
1137 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1138 | if (ret < 0) { | |
1139 | goto error; | |
1140 | } | |
099e26bd | 1141 | |
6993eeb3 CB |
1142 | if (testpoint(thread_manage_apps_before_loop)) { |
1143 | goto error; | |
1144 | } | |
8ac94142 | 1145 | |
840cb59c | 1146 | health_code_update(); |
44a5e5eb | 1147 | |
5eb91c98 | 1148 | while (1) { |
d21b0d71 | 1149 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1150 | |
1151 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1152 | restart: |
840cb59c | 1153 | health_poll_update(); |
5eb91c98 | 1154 | ret = lttng_poll_wait(&events, -1); |
840cb59c | 1155 | health_poll_update(); |
099e26bd | 1156 | if (ret < 0) { |
88f2b785 MD |
1157 | /* |
1158 | * Restart interrupted system call. | |
1159 | */ | |
1160 | if (errno == EINTR) { | |
1161 | goto restart; | |
1162 | } | |
099e26bd DG |
1163 | goto error; |
1164 | } | |
1165 | ||
0d9c5d77 DG |
1166 | nb_fd = ret; |
1167 | ||
5eb91c98 DG |
1168 | for (i = 0; i < nb_fd; i++) { |
1169 | /* Fetch once the poll data */ | |
1170 | revents = LTTNG_POLL_GETEV(&events, i); | |
1171 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1172 | ||
840cb59c | 1173 | health_code_update(); |
44a5e5eb | 1174 | |
5eb91c98 DG |
1175 | /* Thread quit pipe has been closed. Killing thread. */ |
1176 | ret = check_thread_quit_pipe(pollfd, revents); | |
1177 | if (ret) { | |
139ac872 MD |
1178 | err = 0; |
1179 | goto exit; | |
5eb91c98 | 1180 | } |
099e26bd | 1181 | |
5eb91c98 DG |
1182 | /* Inspect the apps cmd pipe */ |
1183 | if (pollfd == apps_cmd_pipe[0]) { | |
1184 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1185 | ERR("Apps command pipe error"); | |
0177d773 | 1186 | goto error; |
5eb91c98 DG |
1187 | } else if (revents & LPOLLIN) { |
1188 | /* Empty pipe */ | |
f921c78f DG |
1189 | do { |
1190 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1191 | } while (ret < 0 && errno == EINTR); | |
5eb91c98 | 1192 | if (ret < 0 || ret < sizeof(ust_cmd)) { |
76d7553f | 1193 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1194 | goto error; |
1195 | } | |
099e26bd | 1196 | |
840cb59c | 1197 | health_code_update(); |
44a5e5eb | 1198 | |
5eb91c98 | 1199 | /* Register applicaton to the session daemon */ |
56fff090 | 1200 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1201 | ust_cmd.sock); |
88ff5b7f | 1202 | if (ret == -ENOMEM) { |
5eb91c98 | 1203 | goto error; |
88ff5b7f MD |
1204 | } else if (ret < 0) { |
1205 | break; | |
5eb91c98 DG |
1206 | } |
1207 | ||
840cb59c | 1208 | health_code_update(); |
44a5e5eb | 1209 | |
acc7b41b | 1210 | /* |
e0c7ec2b | 1211 | * Validate UST version compatibility. |
acc7b41b | 1212 | */ |
e0c7ec2b DG |
1213 | ret = ust_app_validate_version(ust_cmd.sock); |
1214 | if (ret >= 0) { | |
1215 | /* | |
1216 | * Add channel(s) and event(s) to newly registered apps | |
1217 | * from lttng global UST domain. | |
1218 | */ | |
1219 | update_ust_app(ust_cmd.sock); | |
1220 | } | |
acc7b41b | 1221 | |
840cb59c | 1222 | health_code_update(); |
44a5e5eb | 1223 | |
f2ca2e25 | 1224 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1225 | if (ret < 0) { |
1226 | /* | |
1227 | * If the registration is not possible, we simply | |
1228 | * unregister the apps and continue | |
1229 | */ | |
56fff090 | 1230 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1231 | } else { |
1232 | /* | |
622c9ecf DG |
1233 | * We only monitor the error events of the socket. This |
1234 | * thread does not handle any incoming data from UST | |
1235 | * (POLLIN). | |
5eb91c98 | 1236 | */ |
622c9ecf DG |
1237 | ret = lttng_poll_add(&events, ust_cmd.sock, |
1238 | LPOLLERR & LPOLLHUP & LPOLLRDHUP); | |
5eb91c98 DG |
1239 | if (ret < 0) { |
1240 | goto error; | |
1241 | } | |
1242 | ||
ae9e45b3 DG |
1243 | /* Set socket timeout for both receiving and ending */ |
1244 | (void) lttcomm_setsockopt_rcv_timeout(ust_cmd.sock, | |
1245 | app_socket_timeout); | |
1246 | (void) lttcomm_setsockopt_snd_timeout(ust_cmd.sock, | |
1247 | app_socket_timeout); | |
1248 | ||
54d01ffb DG |
1249 | DBG("Apps with sock %d added to poll set", |
1250 | ust_cmd.sock); | |
5eb91c98 | 1251 | } |
487cf67c | 1252 | |
840cb59c | 1253 | health_code_update(); |
44a5e5eb | 1254 | |
5eb91c98 | 1255 | break; |
0177d773 | 1256 | } |
5eb91c98 DG |
1257 | } else { |
1258 | /* | |
54d01ffb DG |
1259 | * At this point, we know that a registered application made |
1260 | * the event at poll_wait. | |
5eb91c98 DG |
1261 | */ |
1262 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1263 | /* Removing from the poll set */ | |
1264 | ret = lttng_poll_del(&events, pollfd); | |
1265 | if (ret < 0) { | |
1266 | goto error; | |
1267 | } | |
099e26bd | 1268 | |
b9d9b220 | 1269 | /* Socket closed on remote end. */ |
56fff090 | 1270 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1271 | break; |
1272 | } | |
099e26bd | 1273 | } |
44a5e5eb | 1274 | |
840cb59c | 1275 | health_code_update(); |
099e26bd | 1276 | } |
099e26bd DG |
1277 | } |
1278 | ||
139ac872 | 1279 | exit: |
099e26bd | 1280 | error: |
5eb91c98 | 1281 | lttng_poll_clean(&events); |
76d7553f | 1282 | error_poll_create: |
6993eeb3 | 1283 | error_testpoint: |
6620da75 DG |
1284 | utils_close_pipe(apps_cmd_pipe); |
1285 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1286 | ||
1287 | /* | |
1288 | * We don't clean the UST app hash table here since already registered | |
1289 | * applications can still be controlled so let them be until the session | |
1290 | * daemon dies or the applications stop. | |
1291 | */ | |
1292 | ||
139ac872 | 1293 | if (err) { |
840cb59c | 1294 | health_error(); |
139ac872 MD |
1295 | ERR("Health error occurred in %s", __func__); |
1296 | } | |
927ca06a | 1297 | health_unregister(); |
76d7553f | 1298 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1299 | rcu_thread_offline(); |
1300 | rcu_unregister_thread(); | |
099e26bd DG |
1301 | return NULL; |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Dispatch request from the registration threads to the application | |
1306 | * communication thread. | |
1307 | */ | |
1308 | static void *thread_dispatch_ust_registration(void *data) | |
1309 | { | |
1310 | int ret; | |
1311 | struct cds_wfq_node *node; | |
1312 | struct ust_command *ust_cmd = NULL; | |
1313 | ||
1314 | DBG("[thread] Dispatch UST command started"); | |
1315 | ||
26c9d55e | 1316 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
099e26bd DG |
1317 | /* Atomically prepare the queue futex */ |
1318 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1319 | ||
1320 | do { | |
1321 | /* Dequeue command for registration */ | |
1322 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1323 | if (node == NULL) { | |
00a17c97 | 1324 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1325 | /* Continue thread execution */ |
1326 | break; | |
1327 | } | |
1328 | ||
1329 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1330 | ||
2f50c8a3 DG |
1331 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1332 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1333 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1334 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1335 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1336 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1337 | /* |
1338 | * Inform apps thread of the new application registration. This | |
1339 | * call is blocking so we can be assured that the data will be read | |
1340 | * at some point in time or wait to the end of the world :) | |
1341 | */ | |
6620da75 | 1342 | if (apps_cmd_pipe[1] >= 0) { |
fbb3b395 DG |
1343 | do { |
1344 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1345 | sizeof(struct ust_command)); | |
1346 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 1347 | if (ret < 0 || ret != sizeof(struct ust_command)) { |
6620da75 DG |
1348 | PERROR("write apps cmd pipe"); |
1349 | if (errno == EBADF) { | |
1350 | /* | |
1351 | * We can't inform the application thread to process | |
1352 | * registration. We will exit or else application | |
1353 | * registration will not occur and tracing will never | |
1354 | * start. | |
1355 | */ | |
1356 | goto error; | |
1357 | } | |
1358 | } | |
1359 | } else { | |
1360 | /* Application manager thread is not available. */ | |
1361 | ret = close(ust_cmd->sock); | |
1362 | if (ret < 0) { | |
1363 | PERROR("close ust_cmd sock"); | |
099e26bd DG |
1364 | } |
1365 | } | |
1366 | free(ust_cmd); | |
1367 | } while (node != NULL); | |
1368 | ||
1369 | /* Futex wait on queue. Blocking call on futex() */ | |
1370 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1371 | } | |
1372 | ||
1373 | error: | |
1374 | DBG("Dispatch thread dying"); | |
1375 | return NULL; | |
1376 | } | |
1377 | ||
1378 | /* | |
1379 | * This thread manage application registration. | |
1380 | */ | |
1381 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1382 | { |
139ac872 | 1383 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1384 | uint32_t revents, nb_fd; |
1385 | struct lttng_poll_event events; | |
099e26bd DG |
1386 | /* |
1387 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1388 | * freed in the manage apps thread. | |
1389 | */ | |
1390 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1391 | |
099e26bd | 1392 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1393 | |
927ca06a DG |
1394 | health_register(HEALTH_TYPE_APP_REG); |
1395 | ||
6993eeb3 CB |
1396 | if (testpoint(thread_registration_apps)) { |
1397 | goto error_testpoint; | |
1398 | } | |
8ac94142 | 1399 | |
1d4b027a DG |
1400 | ret = lttcomm_listen_unix_sock(apps_sock); |
1401 | if (ret < 0) { | |
76d7553f | 1402 | goto error_listen; |
1d4b027a DG |
1403 | } |
1404 | ||
5eb91c98 DG |
1405 | /* |
1406 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1407 | * more will be added to this poll set. | |
1408 | */ | |
1409 | ret = create_thread_poll_set(&events, 2); | |
1410 | if (ret < 0) { | |
76d7553f | 1411 | goto error_create_poll; |
5eb91c98 | 1412 | } |
273ea72c | 1413 | |
5eb91c98 DG |
1414 | /* Add the application registration socket */ |
1415 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1416 | if (ret < 0) { | |
76d7553f | 1417 | goto error_poll_add; |
5eb91c98 | 1418 | } |
273ea72c | 1419 | |
1d4b027a | 1420 | /* Notify all applications to register */ |
0fdd1e2c DG |
1421 | ret = notify_ust_apps(1); |
1422 | if (ret < 0) { | |
1423 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1424 | "Execution continues but there might be problem for already\n" |
1425 | "running applications that wishes to register."); | |
0fdd1e2c | 1426 | } |
1d4b027a DG |
1427 | |
1428 | while (1) { | |
1429 | DBG("Accepting application registration"); | |
273ea72c DG |
1430 | |
1431 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1432 | restart: |
840cb59c | 1433 | health_poll_update(); |
5eb91c98 | 1434 | ret = lttng_poll_wait(&events, -1); |
840cb59c | 1435 | health_poll_update(); |
273ea72c | 1436 | if (ret < 0) { |
88f2b785 MD |
1437 | /* |
1438 | * Restart interrupted system call. | |
1439 | */ | |
1440 | if (errno == EINTR) { | |
1441 | goto restart; | |
1442 | } | |
273ea72c DG |
1443 | goto error; |
1444 | } | |
1445 | ||
0d9c5d77 DG |
1446 | nb_fd = ret; |
1447 | ||
5eb91c98 | 1448 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1449 | health_code_update(); |
139ac872 | 1450 | |
5eb91c98 DG |
1451 | /* Fetch once the poll data */ |
1452 | revents = LTTNG_POLL_GETEV(&events, i); | |
1453 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1454 | |
5eb91c98 DG |
1455 | /* Thread quit pipe has been closed. Killing thread. */ |
1456 | ret = check_thread_quit_pipe(pollfd, revents); | |
1457 | if (ret) { | |
139ac872 MD |
1458 | err = 0; |
1459 | goto exit; | |
90014c57 | 1460 | } |
1d4b027a | 1461 | |
5eb91c98 DG |
1462 | /* Event on the registration socket */ |
1463 | if (pollfd == apps_sock) { | |
1464 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1465 | ERR("Register apps socket poll error"); | |
1466 | goto error; | |
1467 | } else if (revents & LPOLLIN) { | |
1468 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1469 | if (sock < 0) { | |
1470 | goto error; | |
1471 | } | |
099e26bd | 1472 | |
b662582b DG |
1473 | /* |
1474 | * Set the CLOEXEC flag. Return code is useless because | |
1475 | * either way, the show must go on. | |
1476 | */ | |
1477 | (void) utils_set_fd_cloexec(sock); | |
1478 | ||
5eb91c98 | 1479 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1480 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1481 | if (ust_cmd == NULL) { |
76d7553f | 1482 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1483 | goto error; |
1484 | } | |
1d4b027a | 1485 | |
5eb91c98 DG |
1486 | /* |
1487 | * Using message-based transmissions to ensure we don't | |
1488 | * have to deal with partially received messages. | |
1489 | */ | |
4063050c MD |
1490 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1491 | if (ret < 0) { | |
1492 | ERR("Exhausted file descriptors allowed for applications."); | |
1493 | free(ust_cmd); | |
1494 | ret = close(sock); | |
1495 | if (ret) { | |
1496 | PERROR("close"); | |
1497 | } | |
1498 | sock = -1; | |
1499 | continue; | |
1500 | } | |
840cb59c | 1501 | health_code_update(); |
5eb91c98 DG |
1502 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1503 | sizeof(struct ust_register_msg)); | |
1504 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1505 | if (ret < 0) { | |
76d7553f | 1506 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1507 | } else { |
1508 | ERR("Wrong size received on apps register"); | |
1509 | } | |
1510 | free(ust_cmd); | |
76d7553f MD |
1511 | ret = close(sock); |
1512 | if (ret) { | |
1513 | PERROR("close"); | |
1514 | } | |
4063050c | 1515 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1516 | sock = -1; |
5eb91c98 DG |
1517 | continue; |
1518 | } | |
840cb59c | 1519 | health_code_update(); |
099e26bd | 1520 | |
5eb91c98 | 1521 | ust_cmd->sock = sock; |
34a2494f | 1522 | sock = -1; |
099e26bd | 1523 | |
5eb91c98 DG |
1524 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1525 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1526 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1527 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1528 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1529 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1530 | |
5eb91c98 DG |
1531 | /* |
1532 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1533 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1534 | */ |
1535 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1536 | ||
1537 | /* | |
1538 | * Wake the registration queue futex. Implicit memory | |
1539 | * barrier with the exchange in cds_wfq_enqueue. | |
1540 | */ | |
1541 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1542 | } | |
1543 | } | |
90014c57 | 1544 | } |
1d4b027a DG |
1545 | } |
1546 | ||
139ac872 | 1547 | exit: |
1d4b027a | 1548 | error: |
139ac872 | 1549 | if (err) { |
840cb59c | 1550 | health_error(); |
139ac872 MD |
1551 | ERR("Health error occurred in %s", __func__); |
1552 | } | |
139ac872 | 1553 | |
0fdd1e2c DG |
1554 | /* Notify that the registration thread is gone */ |
1555 | notify_ust_apps(0); | |
1556 | ||
a4b35e07 | 1557 | if (apps_sock >= 0) { |
76d7553f MD |
1558 | ret = close(apps_sock); |
1559 | if (ret) { | |
1560 | PERROR("close"); | |
1561 | } | |
a4b35e07 | 1562 | } |
46c3f085 | 1563 | if (sock >= 0) { |
76d7553f MD |
1564 | ret = close(sock); |
1565 | if (ret) { | |
1566 | PERROR("close"); | |
1567 | } | |
4063050c | 1568 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1569 | } |
273ea72c | 1570 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1571 | |
76d7553f | 1572 | error_poll_add: |
5eb91c98 | 1573 | lttng_poll_clean(&events); |
76d7553f MD |
1574 | error_listen: |
1575 | error_create_poll: | |
6993eeb3 | 1576 | error_testpoint: |
76d7553f | 1577 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1578 | health_unregister(); |
5eb91c98 | 1579 | |
1d4b027a DG |
1580 | return NULL; |
1581 | } | |
1582 | ||
8c0faa1d | 1583 | /* |
3bd1e081 | 1584 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1585 | * exec or it will fails. |
8c0faa1d | 1586 | */ |
3bd1e081 | 1587 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1588 | { |
a23ec3a7 | 1589 | int ret, clock_ret; |
ee0b0061 DG |
1590 | struct timespec timeout; |
1591 | ||
a23ec3a7 DG |
1592 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1593 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1594 | |
a23ec3a7 DG |
1595 | /* Setup pthread condition */ |
1596 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1597 | if (ret != 0) { | |
1598 | errno = ret; | |
1599 | PERROR("pthread_condattr_init consumer data"); | |
1600 | goto error; | |
1601 | } | |
1602 | ||
1603 | /* | |
1604 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1605 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1606 | * for a more details and how we noticed it. | |
1607 | */ | |
1608 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1609 | if (ret != 0) { | |
1610 | errno = ret; | |
1611 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1612 | goto error; |
1613 | } | |
8c0faa1d | 1614 | |
a23ec3a7 DG |
1615 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1616 | if (ret != 0) { | |
1617 | errno = ret; | |
1618 | PERROR("pthread_cond_init consumer data"); | |
1619 | goto error; | |
1620 | } | |
1621 | ||
1622 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1623 | consumer_data); | |
8c0faa1d | 1624 | if (ret != 0) { |
3bd1e081 | 1625 | PERROR("pthread_create consumer"); |
ee0b0061 | 1626 | ret = -1; |
8c0faa1d DG |
1627 | goto error; |
1628 | } | |
1629 | ||
a23ec3a7 DG |
1630 | /* We are about to wait on a pthread condition */ |
1631 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1632 | ||
ee0b0061 | 1633 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1634 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1635 | /* | |
1636 | * Set the timeout for the condition timed wait even if the clock gettime | |
1637 | * call fails since we might loop on that call and we want to avoid to | |
1638 | * increment the timeout too many times. | |
1639 | */ | |
1640 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1641 | ||
1642 | /* | |
1643 | * The following loop COULD be skipped in some conditions so this is why we | |
1644 | * set ret to 0 in order to make sure at least one round of the loop is | |
1645 | * done. | |
1646 | */ | |
1647 | ret = 0; | |
1648 | ||
1649 | /* | |
1650 | * Loop until the condition is reached or when a timeout is reached. Note | |
1651 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1652 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1653 | * possible. This loop does not take any chances and works with both of | |
1654 | * them. | |
1655 | */ | |
1656 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1657 | if (clock_ret < 0) { | |
1658 | PERROR("clock_gettime spawn consumer"); | |
1659 | /* Infinite wait for the consumerd thread to be ready */ | |
1660 | ret = pthread_cond_wait(&consumer_data->cond, | |
1661 | &consumer_data->cond_mutex); | |
1662 | } else { | |
1663 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1664 | &consumer_data->cond_mutex, &timeout); | |
1665 | } | |
ee0b0061 | 1666 | } |
8c0faa1d | 1667 | |
a23ec3a7 DG |
1668 | /* Release the pthread condition */ |
1669 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1670 | ||
1671 | if (ret != 0) { | |
1672 | errno = ret; | |
1673 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1674 | /* |
1675 | * Call has timed out so we kill the kconsumerd_thread and return | |
1676 | * an error. | |
1677 | */ | |
a23ec3a7 DG |
1678 | ERR("Condition timed out. The consumer thread was never ready." |
1679 | " Killing it"); | |
3bd1e081 | 1680 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1681 | if (ret < 0) { |
3bd1e081 | 1682 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1683 | } |
1684 | } else { | |
a23ec3a7 | 1685 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1686 | } |
1687 | goto error; | |
1688 | } | |
1689 | ||
3bd1e081 MD |
1690 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1691 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 1692 | ERR("Consumerd did not start"); |
3bd1e081 | 1693 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1694 | goto error; |
1695 | } | |
3bd1e081 | 1696 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1697 | |
8c0faa1d DG |
1698 | return 0; |
1699 | ||
1700 | error: | |
1701 | return ret; | |
1702 | } | |
1703 | ||
d9800920 | 1704 | /* |
3bd1e081 | 1705 | * Join consumer thread |
d9800920 | 1706 | */ |
3bd1e081 | 1707 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1708 | { |
1709 | void *status; | |
cf3af59e | 1710 | |
e8209f6b DG |
1711 | /* Consumer pid must be a real one. */ |
1712 | if (consumer_data->pid > 0) { | |
c617c0c6 | 1713 | int ret; |
3bd1e081 | 1714 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 1715 | if (ret) { |
3bd1e081 | 1716 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1717 | return ret; |
1718 | } | |
3bd1e081 | 1719 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1720 | } else { |
1721 | return 0; | |
1722 | } | |
1723 | } | |
1724 | ||
8c0faa1d | 1725 | /* |
3bd1e081 | 1726 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1727 | * |
d063d709 | 1728 | * Return pid if successful else -1. |
8c0faa1d | 1729 | */ |
3bd1e081 | 1730 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1731 | { |
1732 | int ret; | |
1733 | pid_t pid; | |
94c55f17 | 1734 | const char *consumer_to_use; |
53086306 | 1735 | const char *verbosity; |
94c55f17 | 1736 | struct stat st; |
8c0faa1d | 1737 | |
3bd1e081 | 1738 | DBG("Spawning consumerd"); |
c49dc785 | 1739 | |
8c0faa1d DG |
1740 | pid = fork(); |
1741 | if (pid == 0) { | |
1742 | /* | |
3bd1e081 | 1743 | * Exec consumerd. |
8c0faa1d | 1744 | */ |
daee5345 | 1745 | if (opt_verbose_consumer) { |
53086306 DG |
1746 | verbosity = "--verbose"; |
1747 | } else { | |
1748 | verbosity = "--quiet"; | |
1749 | } | |
3bd1e081 MD |
1750 | switch (consumer_data->type) { |
1751 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1752 | /* |
c7704d57 DG |
1753 | * Find out which consumerd to execute. We will first try the |
1754 | * 64-bit path, then the sessiond's installation directory, and | |
1755 | * fallback on the 32-bit one, | |
94c55f17 | 1756 | */ |
63a799e8 AM |
1757 | DBG3("Looking for a kernel consumer at these locations:"); |
1758 | DBG3(" 1) %s", consumerd64_bin); | |
1759 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1760 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1761 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1762 | DBG3("Found location #1"); |
94c55f17 | 1763 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1764 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1765 | DBG3("Found location #2"); |
94c55f17 | 1766 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1767 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1768 | DBG3("Found location #3"); |
eb1e0bd4 | 1769 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1770 | } else { |
63a799e8 | 1771 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1772 | break; |
1773 | } | |
1774 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1775 | execl(consumer_to_use, | |
1776 | "lttng-consumerd", verbosity, "-k", | |
1777 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1778 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1779 | NULL); | |
3bd1e081 | 1780 | break; |
7753dea8 MD |
1781 | case LTTNG_CONSUMER64_UST: |
1782 | { | |
b1e0b6b6 | 1783 | char *tmpnew = NULL; |
8f4905da MD |
1784 | |
1785 | if (consumerd64_libdir[0] != '\0') { | |
1786 | char *tmp; | |
1787 | size_t tmplen; | |
1788 | ||
1789 | tmp = getenv("LD_LIBRARY_PATH"); | |
1790 | if (!tmp) { | |
1791 | tmp = ""; | |
1792 | } | |
1793 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1794 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1795 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1796 | if (!tmpnew) { | |
1797 | ret = -ENOMEM; | |
1798 | goto error; | |
1799 | } | |
1800 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1801 | strcat(tmpnew, consumerd64_libdir); | |
1802 | if (tmp[0] != '\0') { | |
1803 | strcat(tmpnew, ":"); | |
1804 | strcat(tmpnew, tmp); | |
1805 | } | |
1806 | ret = putenv(tmpnew); | |
1807 | if (ret) { | |
1808 | ret = -errno; | |
1809 | goto error; | |
1810 | } | |
1811 | } | |
94c55f17 | 1812 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1813 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1814 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1815 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1816 | NULL); | |
8f4905da MD |
1817 | if (consumerd64_libdir[0] != '\0') { |
1818 | free(tmpnew); | |
1819 | } | |
1820 | if (ret) { | |
1821 | goto error; | |
1822 | } | |
3bd1e081 | 1823 | break; |
7753dea8 MD |
1824 | } |
1825 | case LTTNG_CONSUMER32_UST: | |
1826 | { | |
937dde8e | 1827 | char *tmpnew = NULL; |
8f4905da MD |
1828 | |
1829 | if (consumerd32_libdir[0] != '\0') { | |
1830 | char *tmp; | |
1831 | size_t tmplen; | |
1832 | ||
1833 | tmp = getenv("LD_LIBRARY_PATH"); | |
1834 | if (!tmp) { | |
1835 | tmp = ""; | |
1836 | } | |
1837 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1838 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1839 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1840 | if (!tmpnew) { | |
1841 | ret = -ENOMEM; | |
1842 | goto error; | |
1843 | } | |
1844 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1845 | strcat(tmpnew, consumerd32_libdir); | |
1846 | if (tmp[0] != '\0') { | |
1847 | strcat(tmpnew, ":"); | |
1848 | strcat(tmpnew, tmp); | |
1849 | } | |
1850 | ret = putenv(tmpnew); | |
1851 | if (ret) { | |
1852 | ret = -errno; | |
1853 | goto error; | |
1854 | } | |
1855 | } | |
94c55f17 | 1856 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1857 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1858 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1859 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1860 | NULL); | |
8f4905da MD |
1861 | if (consumerd32_libdir[0] != '\0') { |
1862 | free(tmpnew); | |
1863 | } | |
1864 | if (ret) { | |
1865 | goto error; | |
1866 | } | |
7753dea8 MD |
1867 | break; |
1868 | } | |
3bd1e081 | 1869 | default: |
76d7553f | 1870 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1871 | exit(EXIT_FAILURE); |
1872 | } | |
8c0faa1d | 1873 | if (errno != 0) { |
76d7553f | 1874 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1875 | } |
1876 | exit(EXIT_FAILURE); | |
1877 | } else if (pid > 0) { | |
1878 | ret = pid; | |
8c0faa1d | 1879 | } else { |
76d7553f | 1880 | PERROR("start consumer fork"); |
8c0faa1d | 1881 | ret = -errno; |
8c0faa1d | 1882 | } |
8f4905da | 1883 | error: |
8c0faa1d DG |
1884 | return ret; |
1885 | } | |
1886 | ||
693bd40b | 1887 | /* |
3bd1e081 | 1888 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1889 | */ |
3bd1e081 | 1890 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 1891 | { |
c617c0c6 | 1892 | int ret; |
edb8b045 DG |
1893 | |
1894 | /* | |
1895 | * Set the listen() state on the socket since there is a possible race | |
1896 | * between the exec() of the consumer daemon and this call if place in the | |
1897 | * consumer thread. See bug #366 for more details. | |
1898 | */ | |
1899 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
1900 | if (ret < 0) { | |
1901 | goto error; | |
1902 | } | |
693bd40b | 1903 | |
3bd1e081 MD |
1904 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1905 | if (consumer_data->pid != 0) { | |
1906 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1907 | goto end; |
1908 | } | |
693bd40b | 1909 | |
3bd1e081 | 1910 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1911 | if (ret < 0) { |
3bd1e081 MD |
1912 | ERR("Spawning consumerd failed"); |
1913 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1914 | goto error; |
693bd40b | 1915 | } |
c49dc785 | 1916 | |
3bd1e081 MD |
1917 | /* Setting up the consumer_data pid */ |
1918 | consumer_data->pid = ret; | |
48842b30 | 1919 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1920 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1921 | |
3bd1e081 MD |
1922 | DBG2("Spawning consumer control thread"); |
1923 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1924 | if (ret < 0) { |
3bd1e081 | 1925 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1926 | goto error; |
1927 | } | |
1928 | ||
c49dc785 | 1929 | end: |
693bd40b DG |
1930 | return 0; |
1931 | ||
1932 | error: | |
edb8b045 DG |
1933 | /* Cleanup already created socket on error. */ |
1934 | if (consumer_data->err_sock >= 0) { | |
c617c0c6 MD |
1935 | int err; |
1936 | ||
edb8b045 DG |
1937 | err = close(consumer_data->err_sock); |
1938 | if (err < 0) { | |
1939 | PERROR("close consumer data error socket"); | |
1940 | } | |
1941 | } | |
693bd40b DG |
1942 | return ret; |
1943 | } | |
1944 | ||
44a5e5eb | 1945 | /* |
139ac872 MD |
1946 | * Compute health status of each consumer. If one of them is zero (bad |
1947 | * state), we return 0. | |
44a5e5eb DG |
1948 | */ |
1949 | static int check_consumer_health(void) | |
1950 | { | |
1951 | int ret; | |
1952 | ||
927ca06a | 1953 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
1954 | |
1955 | DBG3("Health consumer check %d", ret); | |
1956 | ||
1957 | return ret; | |
1958 | } | |
1959 | ||
b73401da | 1960 | /* |
096102bd | 1961 | * Setup necessary data for kernel tracer action. |
b73401da | 1962 | */ |
096102bd | 1963 | static int init_kernel_tracer(void) |
b73401da DG |
1964 | { |
1965 | int ret; | |
b73401da | 1966 | |
096102bd DG |
1967 | /* Modprobe lttng kernel modules */ |
1968 | ret = modprobe_lttng_control(); | |
b73401da | 1969 | if (ret < 0) { |
b73401da DG |
1970 | goto error; |
1971 | } | |
1972 | ||
096102bd DG |
1973 | /* Open debugfs lttng */ |
1974 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1975 | if (kernel_tracer_fd < 0) { | |
1976 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
1977 | ret = -1; |
1978 | goto error_open; | |
54d01ffb DG |
1979 | } |
1980 | ||
2f77fc4b DG |
1981 | /* Validate kernel version */ |
1982 | ret = kernel_validate_version(kernel_tracer_fd); | |
1983 | if (ret < 0) { | |
1984 | goto error_version; | |
b551a063 | 1985 | } |
54d01ffb | 1986 | |
2f77fc4b DG |
1987 | ret = modprobe_lttng_data(); |
1988 | if (ret < 0) { | |
1989 | goto error_modules; | |
54d01ffb DG |
1990 | } |
1991 | ||
2f77fc4b DG |
1992 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
1993 | return 0; | |
1994 | ||
1995 | error_version: | |
1996 | modprobe_remove_lttng_control(); | |
1997 | ret = close(kernel_tracer_fd); | |
1998 | if (ret) { | |
1999 | PERROR("close"); | |
b551a063 | 2000 | } |
2f77fc4b | 2001 | kernel_tracer_fd = -1; |
f73fabfd | 2002 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2003 | |
2f77fc4b DG |
2004 | error_modules: |
2005 | ret = close(kernel_tracer_fd); | |
2006 | if (ret) { | |
2007 | PERROR("close"); | |
b551a063 | 2008 | } |
54d01ffb | 2009 | |
2f77fc4b DG |
2010 | error_open: |
2011 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2012 | |
2013 | error: | |
2f77fc4b DG |
2014 | WARN("No kernel tracer available"); |
2015 | kernel_tracer_fd = -1; | |
2016 | if (!is_root) { | |
f73fabfd | 2017 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2018 | } else { |
f73fabfd | 2019 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2020 | } |
54d01ffb DG |
2021 | } |
2022 | ||
2f77fc4b | 2023 | |
54d01ffb | 2024 | /* |
2f77fc4b DG |
2025 | * Copy consumer output from the tracing session to the domain session. The |
2026 | * function also applies the right modification on a per domain basis for the | |
2027 | * trace files destination directory. | |
54d01ffb | 2028 | */ |
2f77fc4b | 2029 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2030 | { |
2031 | int ret; | |
2f77fc4b DG |
2032 | const char *dir_name; |
2033 | struct consumer_output *consumer; | |
2034 | ||
2035 | assert(session); | |
2036 | assert(session->consumer); | |
54d01ffb | 2037 | |
b551a063 DG |
2038 | switch (domain) { |
2039 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2040 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2041 | /* |
2042 | * XXX: We should audit the session creation and what this function | |
2043 | * does "extra" in order to avoid a destroy since this function is used | |
2044 | * in the domain session creation (kernel and ust) only. Same for UST | |
2045 | * domain. | |
2046 | */ | |
2047 | if (session->kernel_session->consumer) { | |
2048 | consumer_destroy_output(session->kernel_session->consumer); | |
2049 | } | |
2f77fc4b DG |
2050 | session->kernel_session->consumer = |
2051 | consumer_copy_output(session->consumer); | |
2052 | /* Ease our life a bit for the next part */ | |
2053 | consumer = session->kernel_session->consumer; | |
2054 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2055 | break; |
2056 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2057 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2058 | if (session->ust_session->consumer) { |
2059 | consumer_destroy_output(session->ust_session->consumer); | |
2060 | } | |
2f77fc4b DG |
2061 | session->ust_session->consumer = |
2062 | consumer_copy_output(session->consumer); | |
2063 | /* Ease our life a bit for the next part */ | |
2064 | consumer = session->ust_session->consumer; | |
2065 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2066 | break; |
2067 | default: | |
f73fabfd | 2068 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2069 | goto error; |
2070 | } | |
2071 | ||
2f77fc4b | 2072 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2073 | strncat(consumer->subdir, dir_name, |
2074 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2075 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2076 | ||
f73fabfd | 2077 | ret = LTTNG_OK; |
54d01ffb DG |
2078 | |
2079 | error: | |
2080 | return ret; | |
2081 | } | |
2082 | ||
00e2e675 | 2083 | /* |
2f77fc4b | 2084 | * Create an UST session and add it to the session ust list. |
00e2e675 | 2085 | */ |
2f77fc4b DG |
2086 | static int create_ust_session(struct ltt_session *session, |
2087 | struct lttng_domain *domain) | |
00e2e675 DG |
2088 | { |
2089 | int ret; | |
2f77fc4b | 2090 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2091 | |
a4b92340 | 2092 | assert(session); |
2f77fc4b DG |
2093 | assert(domain); |
2094 | assert(session->consumer); | |
a4b92340 | 2095 | |
2f77fc4b DG |
2096 | switch (domain->type) { |
2097 | case LTTNG_DOMAIN_UST: | |
2098 | break; | |
2099 | default: | |
2100 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2101 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2102 | goto error; |
2103 | } | |
2104 | ||
2f77fc4b DG |
2105 | DBG("Creating UST session"); |
2106 | ||
fdd9eb17 | 2107 | lus = trace_ust_create_session(session->path, session->id); |
2f77fc4b | 2108 | if (lus == NULL) { |
f73fabfd | 2109 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2110 | goto error; |
2111 | } | |
2112 | ||
2f77fc4b DG |
2113 | lus->uid = session->uid; |
2114 | lus->gid = session->gid; | |
2115 | session->ust_session = lus; | |
00e2e675 | 2116 | |
2f77fc4b DG |
2117 | /* Copy session output to the newly created UST session */ |
2118 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2119 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2120 | goto error; |
2121 | } | |
2122 | ||
f73fabfd | 2123 | return LTTNG_OK; |
00e2e675 DG |
2124 | |
2125 | error: | |
2f77fc4b DG |
2126 | free(lus); |
2127 | session->ust_session = NULL; | |
00e2e675 DG |
2128 | return ret; |
2129 | } | |
2130 | ||
2131 | /* | |
2f77fc4b | 2132 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2133 | */ |
2f77fc4b | 2134 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2135 | { |
2136 | int ret; | |
a4b92340 | 2137 | |
2f77fc4b | 2138 | DBG("Creating kernel session"); |
00e2e675 | 2139 | |
2f77fc4b DG |
2140 | ret = kernel_create_session(session, kernel_tracer_fd); |
2141 | if (ret < 0) { | |
f73fabfd | 2142 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2143 | goto error; |
2144 | } | |
2145 | ||
2f77fc4b DG |
2146 | /* Code flow safety */ |
2147 | assert(session->kernel_session); | |
2148 | ||
2149 | /* Copy session output to the newly created Kernel session */ | |
2150 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2151 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2152 | goto error; |
2153 | } | |
2154 | ||
2f77fc4b DG |
2155 | /* Create directory(ies) on local filesystem. */ |
2156 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2157 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2158 | ret = run_as_mkdir_recursive( | |
2159 | session->kernel_session->consumer->dst.trace_path, | |
2160 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2161 | if (ret < 0) { | |
2162 | if (ret != -EEXIST) { | |
2163 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2164 | goto error; |
2165 | } | |
00e2e675 | 2166 | } |
2f77fc4b | 2167 | } |
00e2e675 | 2168 | |
2f77fc4b DG |
2169 | session->kernel_session->uid = session->uid; |
2170 | session->kernel_session->gid = session->gid; | |
00e2e675 | 2171 | |
f73fabfd | 2172 | return LTTNG_OK; |
00e2e675 | 2173 | |
2f77fc4b DG |
2174 | error: |
2175 | trace_kernel_destroy_session(session->kernel_session); | |
2176 | session->kernel_session = NULL; | |
2177 | return ret; | |
2178 | } | |
00e2e675 | 2179 | |
2f77fc4b DG |
2180 | /* |
2181 | * Count number of session permitted by uid/gid. | |
2182 | */ | |
2183 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2184 | { | |
2185 | unsigned int i = 0; | |
2186 | struct ltt_session *session; | |
07424f16 | 2187 | |
2f77fc4b DG |
2188 | DBG("Counting number of available session for UID %d GID %d", |
2189 | uid, gid); | |
2190 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2191 | /* |
2f77fc4b | 2192 | * Only list the sessions the user can control. |
00e2e675 | 2193 | */ |
2f77fc4b DG |
2194 | if (!session_access_ok(session, uid, gid)) { |
2195 | continue; | |
2196 | } | |
2197 | i++; | |
a4b92340 | 2198 | } |
2f77fc4b | 2199 | return i; |
00e2e675 DG |
2200 | } |
2201 | ||
54d01ffb DG |
2202 | /* |
2203 | * Process the command requested by the lttng client within the command | |
2204 | * context structure. This function make sure that the return structure (llm) | |
2205 | * is set and ready for transmission before returning. | |
2206 | * | |
2207 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2208 | * |
2209 | * "sock" is only used for special-case var. len data. | |
54d01ffb | 2210 | */ |
53a80697 MD |
2211 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2212 | int *sock_error) | |
54d01ffb | 2213 | { |
f73fabfd | 2214 | int ret = LTTNG_OK; |
44d3bd01 | 2215 | int need_tracing_session = 1; |
2e09ba09 | 2216 | int need_domain; |
54d01ffb DG |
2217 | |
2218 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2219 | ||
53a80697 MD |
2220 | *sock_error = 0; |
2221 | ||
2e09ba09 MD |
2222 | switch (cmd_ctx->lsm->cmd_type) { |
2223 | case LTTNG_CREATE_SESSION: | |
2224 | case LTTNG_DESTROY_SESSION: | |
2225 | case LTTNG_LIST_SESSIONS: | |
2226 | case LTTNG_LIST_DOMAINS: | |
2227 | case LTTNG_START_TRACE: | |
2228 | case LTTNG_STOP_TRACE: | |
6d805429 | 2229 | case LTTNG_DATA_PENDING: |
2e09ba09 | 2230 | need_domain = 0; |
3aace903 | 2231 | break; |
2e09ba09 MD |
2232 | default: |
2233 | need_domain = 1; | |
2234 | } | |
2235 | ||
2236 | if (opt_no_kernel && need_domain | |
2237 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2238 | if (!is_root) { |
f73fabfd | 2239 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2240 | } else { |
f73fabfd | 2241 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2242 | } |
4fba7219 DG |
2243 | goto error; |
2244 | } | |
2245 | ||
8d3113b2 DG |
2246 | /* Deny register consumer if we already have a spawned consumer. */ |
2247 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2248 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2249 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2250 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2251 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2252 | goto error; |
2253 | } | |
2254 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2255 | } | |
2256 | ||
54d01ffb DG |
2257 | /* |
2258 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2259 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2260 | * command. |
2261 | */ | |
2262 | switch(cmd_ctx->lsm->cmd_type) { | |
2263 | case LTTNG_LIST_SESSIONS: | |
2264 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2265 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2266 | case LTTNG_LIST_DOMAINS: |
2267 | case LTTNG_LIST_CHANNELS: | |
2268 | case LTTNG_LIST_EVENTS: | |
2269 | break; | |
2270 | default: | |
2271 | /* Setup lttng message with no payload */ | |
2272 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2273 | if (ret < 0) { | |
2274 | /* This label does not try to unlock the session */ | |
2275 | goto init_setup_error; | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | /* Commands that DO NOT need a session. */ | |
2280 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2281 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 2282 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2283 | case LTTNG_LIST_SESSIONS: |
2284 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2285 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2286 | need_tracing_session = 0; |
54d01ffb DG |
2287 | break; |
2288 | default: | |
2289 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2290 | /* |
2291 | * We keep the session list lock across _all_ commands | |
2292 | * for now, because the per-session lock does not | |
2293 | * handle teardown properly. | |
2294 | */ | |
74babd95 | 2295 | session_lock_list(); |
54d01ffb DG |
2296 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2297 | if (cmd_ctx->session == NULL) { | |
2298 | if (cmd_ctx->lsm->session.name != NULL) { | |
f73fabfd | 2299 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2300 | } else { |
2301 | /* If no session name specified */ | |
f73fabfd | 2302 | ret = LTTNG_ERR_SELECT_SESS; |
54d01ffb DG |
2303 | } |
2304 | goto error; | |
2305 | } else { | |
2306 | /* Acquire lock for the session */ | |
2307 | session_lock(cmd_ctx->session); | |
2308 | } | |
2309 | break; | |
2310 | } | |
b389abbe | 2311 | |
2e09ba09 MD |
2312 | if (!need_domain) { |
2313 | goto skip_domain; | |
2314 | } | |
a4b92340 | 2315 | |
54d01ffb DG |
2316 | /* |
2317 | * Check domain type for specific "pre-action". | |
2318 | */ | |
2319 | switch (cmd_ctx->lsm->domain.type) { | |
2320 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2321 | if (!is_root) { |
f73fabfd | 2322 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2323 | goto error; |
2324 | } | |
2325 | ||
54d01ffb | 2326 | /* Kernel tracer check */ |
a4b35e07 | 2327 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2328 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2329 | ret = init_kernel_tracer(); |
2330 | if (ret != 0) { | |
54d01ffb DG |
2331 | goto error; |
2332 | } | |
2333 | } | |
5eb91c98 | 2334 | |
5c827ce0 DG |
2335 | /* Consumer is in an ERROR state. Report back to client */ |
2336 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2337 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2338 | goto error; |
2339 | } | |
2340 | ||
54d01ffb | 2341 | /* Need a session for kernel command */ |
44d3bd01 | 2342 | if (need_tracing_session) { |
54d01ffb | 2343 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2344 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2345 | if (ret < 0) { |
f73fabfd | 2346 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2347 | goto error; |
2348 | } | |
b389abbe | 2349 | } |
7d29a247 | 2350 | |
54d01ffb | 2351 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2352 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2353 | if (kconsumer_data.pid == 0 && | |
a4b92340 DG |
2354 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2355 | cmd_ctx->session->start_consumer) { | |
3bd1e081 MD |
2356 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2357 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2358 | if (ret < 0) { |
f73fabfd | 2359 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2360 | goto error; |
950131af | 2361 | } |
5c827ce0 | 2362 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2363 | } else { |
2364 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2365 | } |
173af62f | 2366 | |
a4b92340 DG |
2367 | /* |
2368 | * The consumer was just spawned so we need to add the socket to | |
2369 | * the consumer output of the session if exist. | |
2370 | */ | |
2371 | ret = consumer_create_socket(&kconsumer_data, | |
2372 | cmd_ctx->session->kernel_session->consumer); | |
2373 | if (ret < 0) { | |
2374 | goto error; | |
173af62f | 2375 | } |
0d0c377a | 2376 | } |
5c827ce0 | 2377 | |
54d01ffb | 2378 | break; |
2bdd86d4 | 2379 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2380 | { |
5c827ce0 DG |
2381 | /* Consumer is in an ERROR state. Report back to client */ |
2382 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2383 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2384 | goto error; |
2385 | } | |
2386 | ||
44d3bd01 | 2387 | if (need_tracing_session) { |
a4b92340 | 2388 | /* Create UST session if none exist. */ |
f6a9efaa | 2389 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2390 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2391 | &cmd_ctx->lsm->domain); |
f73fabfd | 2392 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2393 | goto error; |
2394 | } | |
2395 | } | |
00e2e675 | 2396 | |
7753dea8 MD |
2397 | /* Start the UST consumer daemons */ |
2398 | /* 64-bit */ | |
2399 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2400 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2401 | ustconsumer64_data.pid == 0 && |
a4b92340 DG |
2402 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2403 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2404 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2405 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2406 | if (ret < 0) { |
f73fabfd | 2407 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2408 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2409 | goto error; |
2410 | } | |
48842b30 | 2411 | |
173af62f | 2412 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2413 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2414 | } else { |
7753dea8 MD |
2415 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2416 | } | |
173af62f DG |
2417 | |
2418 | /* | |
2419 | * Setup socket for consumer 64 bit. No need for atomic access | |
2420 | * since it was set above and can ONLY be set in this thread. | |
2421 | */ | |
a4b92340 DG |
2422 | ret = consumer_create_socket(&ustconsumer64_data, |
2423 | cmd_ctx->session->ust_session->consumer); | |
2424 | if (ret < 0) { | |
2425 | goto error; | |
173af62f DG |
2426 | } |
2427 | ||
7753dea8 | 2428 | /* 32-bit */ |
fc7a59ce | 2429 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2430 | ustconsumer32_data.pid == 0 && |
a4b92340 DG |
2431 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2432 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2433 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2434 | ret = start_consumerd(&ustconsumer32_data); | |
2435 | if (ret < 0) { | |
f73fabfd | 2436 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2437 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2438 | goto error; |
2439 | } | |
5c827ce0 | 2440 | |
173af62f | 2441 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2442 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2443 | } else { |
2444 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2445 | } |
173af62f DG |
2446 | |
2447 | /* | |
2448 | * Setup socket for consumer 64 bit. No need for atomic access | |
2449 | * since it was set above and can ONLY be set in this thread. | |
2450 | */ | |
a4b92340 DG |
2451 | ret = consumer_create_socket(&ustconsumer32_data, |
2452 | cmd_ctx->session->ust_session->consumer); | |
2453 | if (ret < 0) { | |
2454 | goto error; | |
173af62f | 2455 | } |
44d3bd01 DG |
2456 | } |
2457 | break; | |
48842b30 | 2458 | } |
54d01ffb | 2459 | default: |
54d01ffb DG |
2460 | break; |
2461 | } | |
2e09ba09 | 2462 | skip_domain: |
33a2b854 | 2463 | |
5c827ce0 DG |
2464 | /* Validate consumer daemon state when start/stop trace command */ |
2465 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2466 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2467 | switch (cmd_ctx->lsm->domain.type) { | |
2468 | case LTTNG_DOMAIN_UST: | |
2469 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2470 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2471 | goto error; |
2472 | } | |
2473 | break; | |
2474 | case LTTNG_DOMAIN_KERNEL: | |
2475 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2476 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2477 | goto error; |
2478 | } | |
2479 | break; | |
2480 | } | |
2481 | } | |
2482 | ||
8e0af1b4 MD |
2483 | /* |
2484 | * Check that the UID or GID match that of the tracing session. | |
2485 | * The root user can interact with all sessions. | |
2486 | */ | |
2487 | if (need_tracing_session) { | |
2488 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2489 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2490 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2491 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2492 | goto error; |
2493 | } | |
2494 | } | |
2495 | ||
54d01ffb DG |
2496 | /* Process by command type */ |
2497 | switch (cmd_ctx->lsm->cmd_type) { | |
2498 | case LTTNG_ADD_CONTEXT: | |
2499 | { | |
2500 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2501 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2502 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2503 | break; |
2504 | } | |
2505 | case LTTNG_DISABLE_CHANNEL: | |
2506 | { | |
2507 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2508 | cmd_ctx->lsm->u.disable.channel_name); | |
2509 | break; | |
2510 | } | |
2511 | case LTTNG_DISABLE_EVENT: | |
2512 | { | |
2513 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2514 | cmd_ctx->lsm->u.disable.channel_name, | |
2515 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2516 | break; |
2517 | } | |
54d01ffb DG |
2518 | case LTTNG_DISABLE_ALL_EVENT: |
2519 | { | |
2bdd86d4 | 2520 | DBG("Disabling all events"); |
54d01ffb DG |
2521 | |
2522 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2523 | cmd_ctx->lsm->u.disable.channel_name); | |
2524 | break; | |
2525 | } | |
00e2e675 DG |
2526 | case LTTNG_DISABLE_CONSUMER: |
2527 | { | |
2528 | ret = cmd_disable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); | |
2529 | break; | |
2530 | } | |
54d01ffb DG |
2531 | case LTTNG_ENABLE_CHANNEL: |
2532 | { | |
aea829b3 | 2533 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2534 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2535 | break; |
2536 | } | |
00e2e675 DG |
2537 | case LTTNG_ENABLE_CONSUMER: |
2538 | { | |
a4b92340 DG |
2539 | /* |
2540 | * XXX: 0 means that this URI should be applied on the session. Should | |
2541 | * be a DOMAIN enuam. | |
2542 | */ | |
00e2e675 | 2543 | ret = cmd_enable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); |
f73fabfd | 2544 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2545 | goto error; |
2546 | } | |
2547 | ||
2548 | if (cmd_ctx->lsm->domain.type == 0) { | |
2549 | /* Add the URI for the UST session if a consumer is present. */ | |
2550 | if (cmd_ctx->session->ust_session && | |
2551 | cmd_ctx->session->ust_session->consumer) { | |
2552 | ret = cmd_enable_consumer(LTTNG_DOMAIN_UST, cmd_ctx->session); | |
2553 | } else if (cmd_ctx->session->kernel_session && | |
2554 | cmd_ctx->session->kernel_session->consumer) { | |
2555 | ret = cmd_enable_consumer(LTTNG_DOMAIN_KERNEL, | |
2556 | cmd_ctx->session); | |
2557 | } | |
2558 | } | |
00e2e675 DG |
2559 | break; |
2560 | } | |
54d01ffb DG |
2561 | case LTTNG_ENABLE_EVENT: |
2562 | { | |
2563 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2564 | cmd_ctx->lsm->u.enable.channel_name, | |
025faf73 | 2565 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2566 | break; |
2567 | } | |
2568 | case LTTNG_ENABLE_ALL_EVENT: | |
2569 | { | |
2bdd86d4 | 2570 | DBG("Enabling all events"); |
54d01ffb DG |
2571 | |
2572 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 | 2573 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2574 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2575 | break; |
2576 | } | |
052da939 | 2577 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2578 | { |
9f19cc17 | 2579 | struct lttng_event *events; |
54d01ffb | 2580 | ssize_t nb_events; |
052da939 | 2581 | |
54d01ffb DG |
2582 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2583 | if (nb_events < 0) { | |
f73fabfd | 2584 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2585 | ret = -nb_events; |
2586 | goto error; | |
2ef84c95 DG |
2587 | } |
2588 | ||
2589 | /* | |
2590 | * Setup lttng message with payload size set to the event list size in | |
2591 | * bytes and then copy list into the llm payload. | |
2592 | */ | |
052da939 | 2593 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2594 | if (ret < 0) { |
052da939 | 2595 | free(events); |
2ef84c95 DG |
2596 | goto setup_error; |
2597 | } | |
2598 | ||
2599 | /* Copy event list into message payload */ | |
9f19cc17 | 2600 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2601 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2602 | |
9f19cc17 | 2603 | free(events); |
2ef84c95 | 2604 | |
f73fabfd | 2605 | ret = LTTNG_OK; |
2ef84c95 DG |
2606 | break; |
2607 | } | |
f37d259d MD |
2608 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2609 | { | |
2610 | struct lttng_event_field *fields; | |
2611 | ssize_t nb_fields; | |
2612 | ||
a4b92340 DG |
2613 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2614 | &fields); | |
f37d259d | 2615 | if (nb_fields < 0) { |
f73fabfd | 2616 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2617 | ret = -nb_fields; |
2618 | goto error; | |
2619 | } | |
2620 | ||
2621 | /* | |
2622 | * Setup lttng message with payload size set to the event list size in | |
2623 | * bytes and then copy list into the llm payload. | |
2624 | */ | |
a4b92340 DG |
2625 | ret = setup_lttng_msg(cmd_ctx, |
2626 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2627 | if (ret < 0) { |
2628 | free(fields); | |
2629 | goto setup_error; | |
2630 | } | |
2631 | ||
2632 | /* Copy event list into message payload */ | |
2633 | memcpy(cmd_ctx->llm->payload, fields, | |
2634 | sizeof(struct lttng_event_field) * nb_fields); | |
2635 | ||
2636 | free(fields); | |
2637 | ||
f73fabfd | 2638 | ret = LTTNG_OK; |
f37d259d MD |
2639 | break; |
2640 | } | |
00e2e675 DG |
2641 | case LTTNG_SET_CONSUMER_URI: |
2642 | { | |
a4b92340 DG |
2643 | size_t nb_uri, len; |
2644 | struct lttng_uri *uris; | |
2645 | ||
2646 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2647 | len = nb_uri * sizeof(struct lttng_uri); | |
2648 | ||
2649 | if (nb_uri == 0) { | |
f73fabfd | 2650 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2651 | goto error; |
2652 | } | |
2653 | ||
2654 | uris = zmalloc(len); | |
2655 | if (uris == NULL) { | |
f73fabfd | 2656 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2657 | goto error; |
2658 | } | |
2659 | ||
2660 | /* Receive variable len data */ | |
77c7c900 | 2661 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2662 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2663 | if (ret <= 0) { | |
2664 | DBG("No URIs received from client... continuing"); | |
2665 | *sock_error = 1; | |
f73fabfd | 2666 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2667 | free(uris); |
a4b92340 DG |
2668 | goto error; |
2669 | } | |
2670 | ||
00e2e675 | 2671 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2672 | nb_uri, uris); |
f73fabfd | 2673 | if (ret != LTTNG_OK) { |
b1d41407 | 2674 | free(uris); |
a4b92340 DG |
2675 | goto error; |
2676 | } | |
2677 | ||
2678 | /* | |
2679 | * XXX: 0 means that this URI should be applied on the session. Should | |
2680 | * be a DOMAIN enuam. | |
2681 | */ | |
2682 | if (cmd_ctx->lsm->domain.type == 0) { | |
2683 | /* Add the URI for the UST session if a consumer is present. */ | |
2684 | if (cmd_ctx->session->ust_session && | |
2685 | cmd_ctx->session->ust_session->consumer) { | |
2686 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2687 | nb_uri, uris); | |
2688 | } else if (cmd_ctx->session->kernel_session && | |
2689 | cmd_ctx->session->kernel_session->consumer) { | |
2690 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2691 | cmd_ctx->session, nb_uri, uris); | |
2692 | } | |
2693 | } | |
2694 | ||
b1d41407 DG |
2695 | free(uris); |
2696 | ||
00e2e675 DG |
2697 | break; |
2698 | } | |
f3ed775e | 2699 | case LTTNG_START_TRACE: |
8c0faa1d | 2700 | { |
54d01ffb | 2701 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2702 | break; |
2703 | } | |
f3ed775e | 2704 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2705 | { |
54d01ffb | 2706 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2707 | break; |
2708 | } | |
5e16da05 MD |
2709 | case LTTNG_CREATE_SESSION: |
2710 | { | |
a4b92340 DG |
2711 | size_t nb_uri, len; |
2712 | struct lttng_uri *uris = NULL; | |
2713 | ||
2714 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2715 | len = nb_uri * sizeof(struct lttng_uri); | |
2716 | ||
2717 | if (nb_uri > 0) { | |
2718 | uris = zmalloc(len); | |
2719 | if (uris == NULL) { | |
f73fabfd | 2720 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2721 | goto error; |
2722 | } | |
2723 | ||
2724 | /* Receive variable len data */ | |
77c7c900 | 2725 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
2726 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2727 | if (ret <= 0) { | |
2728 | DBG("No URIs received from client... continuing"); | |
2729 | *sock_error = 1; | |
f73fabfd | 2730 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2731 | free(uris); |
a4b92340 DG |
2732 | goto error; |
2733 | } | |
2734 | ||
2735 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
2736 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 2737 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2738 | free(uris); |
a4b92340 DG |
2739 | goto error; |
2740 | } | |
2741 | } | |
2742 | ||
2743 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
2744 | &cmd_ctx->creds); | |
2745 | ||
b1d41407 DG |
2746 | free(uris); |
2747 | ||
00e2e675 DG |
2748 | break; |
2749 | } | |
5e16da05 MD |
2750 | case LTTNG_DESTROY_SESSION: |
2751 | { | |
2f77fc4b | 2752 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
2753 | |
2754 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 2755 | cmd_ctx->session = NULL; |
5461b305 | 2756 | break; |
5e16da05 | 2757 | } |
9f19cc17 | 2758 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2759 | { |
54d01ffb DG |
2760 | ssize_t nb_dom; |
2761 | struct lttng_domain *domains; | |
5461b305 | 2762 | |
54d01ffb DG |
2763 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2764 | if (nb_dom < 0) { | |
f73fabfd | 2765 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2766 | ret = -nb_dom; |
2767 | goto error; | |
ce3d728c | 2768 | } |
520ff687 | 2769 | |
54d01ffb | 2770 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2771 | if (ret < 0) { |
2772 | goto setup_error; | |
520ff687 | 2773 | } |
57167058 | 2774 | |
54d01ffb DG |
2775 | /* Copy event list into message payload */ |
2776 | memcpy(cmd_ctx->llm->payload, domains, | |
2777 | nb_dom * sizeof(struct lttng_domain)); | |
2778 | ||
2779 | free(domains); | |
5e16da05 | 2780 | |
f73fabfd | 2781 | ret = LTTNG_OK; |
5e16da05 MD |
2782 | break; |
2783 | } | |
9f19cc17 | 2784 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2785 | { |
6775595e | 2786 | int nb_chan; |
54d01ffb DG |
2787 | struct lttng_channel *channels; |
2788 | ||
b551a063 DG |
2789 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
2790 | cmd_ctx->session, &channels); | |
54d01ffb | 2791 | if (nb_chan < 0) { |
f73fabfd | 2792 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2793 | ret = -nb_chan; |
2794 | goto error; | |
5461b305 | 2795 | } |
ca95a216 | 2796 | |
54d01ffb | 2797 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2798 | if (ret < 0) { |
2799 | goto setup_error; | |
2800 | } | |
9f19cc17 | 2801 | |
54d01ffb DG |
2802 | /* Copy event list into message payload */ |
2803 | memcpy(cmd_ctx->llm->payload, channels, | |
2804 | nb_chan * sizeof(struct lttng_channel)); | |
2805 | ||
2806 | free(channels); | |
9f19cc17 | 2807 | |
f73fabfd | 2808 | ret = LTTNG_OK; |
5461b305 | 2809 | break; |
5e16da05 | 2810 | } |
9f19cc17 | 2811 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2812 | { |
b551a063 | 2813 | ssize_t nb_event; |
684d34d2 | 2814 | struct lttng_event *events = NULL; |
9f19cc17 | 2815 | |
b551a063 | 2816 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
2817 | cmd_ctx->lsm->u.list.channel_name, &events); |
2818 | if (nb_event < 0) { | |
f73fabfd | 2819 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2820 | ret = -nb_event; |
2821 | goto error; | |
5461b305 | 2822 | } |
ca95a216 | 2823 | |
54d01ffb | 2824 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2825 | if (ret < 0) { |
2826 | goto setup_error; | |
2827 | } | |
9f19cc17 | 2828 | |
54d01ffb DG |
2829 | /* Copy event list into message payload */ |
2830 | memcpy(cmd_ctx->llm->payload, events, | |
2831 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2832 | |
54d01ffb | 2833 | free(events); |
9f19cc17 | 2834 | |
f73fabfd | 2835 | ret = LTTNG_OK; |
5461b305 | 2836 | break; |
5e16da05 MD |
2837 | } |
2838 | case LTTNG_LIST_SESSIONS: | |
2839 | { | |
8e0af1b4 | 2840 | unsigned int nr_sessions; |
5461b305 | 2841 | |
8e0af1b4 | 2842 | session_lock_list(); |
730389d9 DG |
2843 | nr_sessions = lttng_sessions_count( |
2844 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2845 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 2846 | |
8e0af1b4 | 2847 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 2848 | if (ret < 0) { |
54d01ffb | 2849 | session_unlock_list(); |
5461b305 | 2850 | goto setup_error; |
e065084a | 2851 | } |
5e16da05 | 2852 | |
6c9cc2ab | 2853 | /* Filled the session array */ |
2f77fc4b | 2854 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
2855 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2856 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 2857 | |
54d01ffb | 2858 | session_unlock_list(); |
5e16da05 | 2859 | |
f73fabfd | 2860 | ret = LTTNG_OK; |
5e16da05 MD |
2861 | break; |
2862 | } | |
d0254c7c MD |
2863 | case LTTNG_CALIBRATE: |
2864 | { | |
54d01ffb DG |
2865 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2866 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2867 | break; |
2868 | } | |
d9800920 DG |
2869 | case LTTNG_REGISTER_CONSUMER: |
2870 | { | |
2f77fc4b DG |
2871 | struct consumer_data *cdata; |
2872 | ||
2873 | switch (cmd_ctx->lsm->domain.type) { | |
2874 | case LTTNG_DOMAIN_KERNEL: | |
2875 | cdata = &kconsumer_data; | |
2876 | break; | |
2877 | default: | |
f73fabfd | 2878 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2879 | goto error; |
2880 | } | |
2881 | ||
54d01ffb | 2882 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2883 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
2884 | break; |
2885 | } | |
025faf73 | 2886 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
2887 | { |
2888 | struct lttng_filter_bytecode *bytecode; | |
2889 | ||
025faf73 | 2890 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 2891 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2892 | goto error; |
2893 | } | |
52df2401 MD |
2894 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
2895 | ret = LTTNG_ERR_FILTER_INVAL; | |
2896 | goto error; | |
2897 | } | |
025faf73 | 2898 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 2899 | if (!bytecode) { |
f73fabfd | 2900 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
2901 | goto error; |
2902 | } | |
2903 | /* Receive var. len. data */ | |
2904 | DBG("Receiving var len data from client ..."); | |
2905 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 2906 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
2907 | if (ret <= 0) { |
2908 | DBG("Nothing recv() from client var len data... continuing"); | |
2909 | *sock_error = 1; | |
f73fabfd | 2910 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2911 | goto error; |
2912 | } | |
2913 | ||
2914 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 2915 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 2916 | free(bytecode); |
f73fabfd | 2917 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2918 | goto error; |
2919 | } | |
2920 | ||
025faf73 DG |
2921 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2922 | cmd_ctx->lsm->u.enable.channel_name, | |
2923 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
2924 | break; |
2925 | } | |
6d805429 | 2926 | case LTTNG_DATA_PENDING: |
806e2684 | 2927 | { |
6d805429 | 2928 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
2929 | break; |
2930 | } | |
5e16da05 | 2931 | default: |
f73fabfd | 2932 | ret = LTTNG_ERR_UND; |
5461b305 | 2933 | break; |
fac6795d DG |
2934 | } |
2935 | ||
5461b305 | 2936 | error: |
5461b305 DG |
2937 | if (cmd_ctx->llm == NULL) { |
2938 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2939 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2940 | goto setup_error; |
2941 | } | |
2942 | } | |
54d01ffb | 2943 | /* Set return code */ |
5461b305 | 2944 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2945 | setup_error: |
b5541356 | 2946 | if (cmd_ctx->session) { |
54d01ffb | 2947 | session_unlock(cmd_ctx->session); |
b5541356 | 2948 | } |
256a5576 MD |
2949 | if (need_tracing_session) { |
2950 | session_unlock_list(); | |
2951 | } | |
54d01ffb | 2952 | init_setup_error: |
8028d920 | 2953 | return ret; |
fac6795d DG |
2954 | } |
2955 | ||
44a5e5eb DG |
2956 | /* |
2957 | * Thread managing health check socket. | |
2958 | */ | |
2959 | static void *thread_manage_health(void *data) | |
2960 | { | |
eb4a2943 | 2961 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
2962 | uint32_t revents, nb_fd; |
2963 | struct lttng_poll_event events; | |
2964 | struct lttcomm_health_msg msg; | |
2965 | struct lttcomm_health_data reply; | |
2966 | ||
2967 | DBG("[thread] Manage health check started"); | |
2968 | ||
2969 | rcu_register_thread(); | |
2970 | ||
2971 | /* Create unix socket */ | |
2972 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
2973 | if (sock < 0) { | |
2974 | ERR("Unable to create health check Unix socket"); | |
2975 | ret = -1; | |
2976 | goto error; | |
2977 | } | |
2978 | ||
b662582b DG |
2979 | /* |
2980 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2981 | * show must go on. | |
2982 | */ | |
2983 | (void) utils_set_fd_cloexec(sock); | |
2984 | ||
44a5e5eb DG |
2985 | ret = lttcomm_listen_unix_sock(sock); |
2986 | if (ret < 0) { | |
2987 | goto error; | |
2988 | } | |
2989 | ||
2990 | /* | |
2991 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2992 | * more will be added to this poll set. | |
2993 | */ | |
2994 | ret = create_thread_poll_set(&events, 2); | |
2995 | if (ret < 0) { | |
2996 | goto error; | |
2997 | } | |
2998 | ||
2999 | /* Add the application registration socket */ | |
3000 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3001 | if (ret < 0) { | |
3002 | goto error; | |
3003 | } | |
3004 | ||
3005 | while (1) { | |
3006 | DBG("Health check ready"); | |
3007 | ||
44a5e5eb DG |
3008 | /* Inifinite blocking call, waiting for transmission */ |
3009 | restart: | |
3010 | ret = lttng_poll_wait(&events, -1); | |
3011 | if (ret < 0) { | |
3012 | /* | |
3013 | * Restart interrupted system call. | |
3014 | */ | |
3015 | if (errno == EINTR) { | |
3016 | goto restart; | |
3017 | } | |
3018 | goto error; | |
3019 | } | |
3020 | ||
0d9c5d77 DG |
3021 | nb_fd = ret; |
3022 | ||
44a5e5eb DG |
3023 | for (i = 0; i < nb_fd; i++) { |
3024 | /* Fetch once the poll data */ | |
3025 | revents = LTTNG_POLL_GETEV(&events, i); | |
3026 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3027 | ||
3028 | /* Thread quit pipe has been closed. Killing thread. */ | |
3029 | ret = check_thread_quit_pipe(pollfd, revents); | |
3030 | if (ret) { | |
139ac872 MD |
3031 | err = 0; |
3032 | goto exit; | |
44a5e5eb DG |
3033 | } |
3034 | ||
3035 | /* Event on the registration socket */ | |
3036 | if (pollfd == sock) { | |
3037 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3038 | ERR("Health socket poll error"); | |
3039 | goto error; | |
3040 | } | |
3041 | } | |
3042 | } | |
3043 | ||
3044 | new_sock = lttcomm_accept_unix_sock(sock); | |
3045 | if (new_sock < 0) { | |
3046 | goto error; | |
3047 | } | |
3048 | ||
b662582b DG |
3049 | /* |
3050 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3051 | * show must go on. | |
3052 | */ | |
3053 | (void) utils_set_fd_cloexec(new_sock); | |
3054 | ||
44a5e5eb DG |
3055 | DBG("Receiving data from client for health..."); |
3056 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3057 | if (ret <= 0) { | |
3058 | DBG("Nothing recv() from client... continuing"); | |
3059 | ret = close(new_sock); | |
3060 | if (ret) { | |
3061 | PERROR("close"); | |
3062 | } | |
3063 | new_sock = -1; | |
3064 | continue; | |
3065 | } | |
3066 | ||
3067 | rcu_thread_online(); | |
3068 | ||
3069 | switch (msg.component) { | |
3070 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3071 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3072 | break; |
139ac872 | 3073 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3074 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3075 | break; |
44a5e5eb | 3076 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3077 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3078 | break; |
3079 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3080 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3081 | break; |
3082 | case LTTNG_HEALTH_CONSUMER: | |
3083 | reply.ret_code = check_consumer_health(); | |
3084 | break; | |
3085 | case LTTNG_HEALTH_ALL: | |
44a5e5eb | 3086 | reply.ret_code = |
927ca06a DG |
3087 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3088 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3089 | health_check_state(HEALTH_TYPE_CMD) && | |
3090 | health_check_state(HEALTH_TYPE_KERNEL) && | |
139ac872 | 3091 | check_consumer_health(); |
44a5e5eb DG |
3092 | break; |
3093 | default: | |
f73fabfd | 3094 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3095 | break; |
3096 | } | |
3097 | ||
3098 | /* | |
3099 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3100 | * the client where in the sessiond it is the opposite. Again, this is | |
3101 | * just to make things easier for us poor developer which enjoy a lot | |
3102 | * lazyness. | |
3103 | */ | |
3104 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3105 | reply.ret_code = !reply.ret_code; | |
3106 | } | |
3107 | ||
3108 | DBG2("Health check return value %d", reply.ret_code); | |
3109 | ||
3110 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3111 | if (ret < 0) { | |
3112 | ERR("Failed to send health data back to client"); | |
3113 | } | |
3114 | ||
3115 | /* End of transmission */ | |
3116 | ret = close(new_sock); | |
3117 | if (ret) { | |
3118 | PERROR("close"); | |
3119 | } | |
3120 | new_sock = -1; | |
3121 | } | |
3122 | ||
139ac872 | 3123 | exit: |
44a5e5eb | 3124 | error: |
139ac872 MD |
3125 | if (err) { |
3126 | ERR("Health error occurred in %s", __func__); | |
3127 | } | |
44a5e5eb DG |
3128 | DBG("Health check thread dying"); |
3129 | unlink(health_unix_sock_path); | |
3130 | if (sock >= 0) { | |
3131 | ret = close(sock); | |
3132 | if (ret) { | |
3133 | PERROR("close"); | |
3134 | } | |
3135 | } | |
3136 | if (new_sock >= 0) { | |
3137 | ret = close(new_sock); | |
3138 | if (ret) { | |
3139 | PERROR("close"); | |
3140 | } | |
3141 | } | |
3142 | ||
3143 | lttng_poll_clean(&events); | |
3144 | ||
3145 | rcu_unregister_thread(); | |
3146 | return NULL; | |
3147 | } | |
3148 | ||
1d4b027a | 3149 | /* |
d063d709 DG |
3150 | * This thread manage all clients request using the unix client socket for |
3151 | * communication. | |
1d4b027a DG |
3152 | */ |
3153 | static void *thread_manage_clients(void *data) | |
3154 | { | |
139ac872 | 3155 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3156 | int sock_error; |
5eb91c98 | 3157 | uint32_t revents, nb_fd; |
273ea72c | 3158 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3159 | struct lttng_poll_event events; |
1d4b027a DG |
3160 | |
3161 | DBG("[thread] Manage client started"); | |
3162 | ||
f6a9efaa DG |
3163 | rcu_register_thread(); |
3164 | ||
927ca06a DG |
3165 | health_register(HEALTH_TYPE_CMD); |
3166 | ||
6993eeb3 CB |
3167 | if (testpoint(thread_manage_clients)) { |
3168 | goto error_testpoint; | |
3169 | } | |
3170 | ||
840cb59c | 3171 | health_code_update(); |
44a5e5eb | 3172 | |
1d4b027a DG |
3173 | ret = lttcomm_listen_unix_sock(client_sock); |
3174 | if (ret < 0) { | |
35df2755 | 3175 | goto error_listen; |
1d4b027a DG |
3176 | } |
3177 | ||
5eb91c98 DG |
3178 | /* |
3179 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3180 | * more will be added to this poll set. | |
3181 | */ | |
3182 | ret = create_thread_poll_set(&events, 2); | |
3183 | if (ret < 0) { | |
35df2755 | 3184 | goto error_create_poll; |
5eb91c98 | 3185 | } |
273ea72c | 3186 | |
5eb91c98 DG |
3187 | /* Add the application registration socket */ |
3188 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3189 | if (ret < 0) { | |
3190 | goto error; | |
3191 | } | |
273ea72c | 3192 | |
bbd973c2 DG |
3193 | /* |
3194 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3195 | */ |
3196 | if (opt_sig_parent) { | |
8db8d1dc | 3197 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3198 | } |
3199 | ||
6993eeb3 CB |
3200 | if (testpoint(thread_manage_clients_before_loop)) { |
3201 | goto error; | |
3202 | } | |
8ac94142 | 3203 | |
840cb59c | 3204 | health_code_update(); |
44a5e5eb | 3205 | |
1d4b027a | 3206 | while (1) { |
1d4b027a | 3207 | DBG("Accepting client command ..."); |
273ea72c DG |
3208 | |
3209 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3210 | restart: |
840cb59c | 3211 | health_poll_update(); |
5eb91c98 | 3212 | ret = lttng_poll_wait(&events, -1); |
840cb59c | 3213 | health_poll_update(); |
273ea72c | 3214 | if (ret < 0) { |
88f2b785 MD |
3215 | /* |
3216 | * Restart interrupted system call. | |
3217 | */ | |
3218 | if (errno == EINTR) { | |
3219 | goto restart; | |
3220 | } | |
273ea72c DG |
3221 | goto error; |
3222 | } | |
3223 | ||
0d9c5d77 DG |
3224 | nb_fd = ret; |
3225 | ||
5eb91c98 DG |
3226 | for (i = 0; i < nb_fd; i++) { |
3227 | /* Fetch once the poll data */ | |
3228 | revents = LTTNG_POLL_GETEV(&events, i); | |
3229 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3230 | ||
840cb59c | 3231 | health_code_update(); |
44a5e5eb | 3232 | |
5eb91c98 DG |
3233 | /* Thread quit pipe has been closed. Killing thread. */ |
3234 | ret = check_thread_quit_pipe(pollfd, revents); | |
3235 | if (ret) { | |
139ac872 MD |
3236 | err = 0; |
3237 | goto exit; | |
5eb91c98 DG |
3238 | } |
3239 | ||
3240 | /* Event on the registration socket */ | |
3241 | if (pollfd == client_sock) { | |
3242 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3243 | ERR("Client socket poll error"); | |
3244 | goto error; | |
3245 | } | |
3246 | } | |
3247 | } | |
3248 | ||
3249 | DBG("Wait for client response"); | |
3250 | ||
840cb59c | 3251 | health_code_update(); |
44a5e5eb | 3252 | |
5eb91c98 DG |
3253 | sock = lttcomm_accept_unix_sock(client_sock); |
3254 | if (sock < 0) { | |
273ea72c | 3255 | goto error; |
273ea72c DG |
3256 | } |
3257 | ||
b662582b DG |
3258 | /* |
3259 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3260 | * show must go on. | |
3261 | */ | |
3262 | (void) utils_set_fd_cloexec(sock); | |
3263 | ||
be040666 DG |
3264 | /* Set socket option for credentials retrieval */ |
3265 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3266 | if (ret < 0) { | |
3267 | goto error; | |
3268 | } | |
3269 | ||
5eb91c98 | 3270 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3271 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3272 | if (cmd_ctx == NULL) { |
76d7553f | 3273 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3274 | goto error; |
5eb91c98 | 3275 | } |
1d4b027a | 3276 | |
5eb91c98 | 3277 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3278 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3279 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3280 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3281 | goto error; |
3282 | } | |
1d4b027a | 3283 | |
5eb91c98 DG |
3284 | cmd_ctx->llm = NULL; |
3285 | cmd_ctx->session = NULL; | |
1d4b027a | 3286 | |
840cb59c | 3287 | health_code_update(); |
44a5e5eb | 3288 | |
5eb91c98 DG |
3289 | /* |
3290 | * Data is received from the lttng client. The struct | |
3291 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3292 | * the client. | |
3293 | */ | |
3294 | DBG("Receiving data from client ..."); | |
be040666 DG |
3295 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3296 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3297 | if (ret <= 0) { |
3298 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3299 | ret = close(sock); |
3300 | if (ret) { | |
3301 | PERROR("close"); | |
3302 | } | |
3303 | sock = -1; | |
a2c0da86 | 3304 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3305 | continue; |
3306 | } | |
1d4b027a | 3307 | |
840cb59c | 3308 | health_code_update(); |
44a5e5eb | 3309 | |
5eb91c98 DG |
3310 | // TODO: Validate cmd_ctx including sanity check for |
3311 | // security purpose. | |
f7776ea7 | 3312 | |
f6a9efaa | 3313 | rcu_thread_online(); |
5eb91c98 DG |
3314 | /* |
3315 | * This function dispatch the work to the kernel or userspace tracer | |
3316 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3317 | * informations for the client. The command context struct contains | |
3318 | * everything this function may needs. | |
3319 | */ | |
53a80697 | 3320 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3321 | rcu_thread_offline(); |
5eb91c98 | 3322 | if (ret < 0) { |
53a80697 MD |
3323 | if (sock_error) { |
3324 | ret = close(sock); | |
3325 | if (ret) { | |
3326 | PERROR("close"); | |
3327 | } | |
3328 | sock = -1; | |
3329 | } | |
bbd973c2 | 3330 | /* |
5eb91c98 | 3331 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3332 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3333 | * (ENOMEM). Error detected but still accept |
3334 | * command, unless a socket error has been | |
3335 | * detected. | |
bbd973c2 | 3336 | */ |
bbd973c2 | 3337 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3338 | continue; |
3339 | } | |
d6e4fca4 | 3340 | |
840cb59c | 3341 | health_code_update(); |
44a5e5eb | 3342 | |
54d01ffb DG |
3343 | DBG("Sending response (size: %d, retcode: %s)", |
3344 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3345 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3346 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3347 | if (ret < 0) { |
3348 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3349 | } |
1d4b027a | 3350 | |
5eb91c98 | 3351 | /* End of transmission */ |
76d7553f MD |
3352 | ret = close(sock); |
3353 | if (ret) { | |
3354 | PERROR("close"); | |
3355 | } | |
3356 | sock = -1; | |
be040666 DG |
3357 | |
3358 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3359 | |
840cb59c | 3360 | health_code_update(); |
273ea72c DG |
3361 | } |
3362 | ||
139ac872 | 3363 | exit: |
5eb91c98 | 3364 | error: |
35df2755 CB |
3365 | if (sock >= 0) { |
3366 | ret = close(sock); | |
3367 | if (ret) { | |
3368 | PERROR("close"); | |
3369 | } | |
139ac872 | 3370 | } |
44a5e5eb | 3371 | |
35df2755 CB |
3372 | lttng_poll_clean(&events); |
3373 | clean_command_ctx(&cmd_ctx); | |
3374 | ||
3375 | error_listen: | |
3376 | error_create_poll: | |
6993eeb3 | 3377 | error_testpoint: |
273ea72c | 3378 | unlink(client_unix_sock_path); |
76d7553f MD |
3379 | if (client_sock >= 0) { |
3380 | ret = close(client_sock); | |
3381 | if (ret) { | |
3382 | PERROR("close"); | |
3383 | } | |
a4b35e07 | 3384 | } |
35df2755 CB |
3385 | |
3386 | if (err) { | |
840cb59c | 3387 | health_error(); |
35df2755 | 3388 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3389 | } |
273ea72c | 3390 | |
927ca06a | 3391 | health_unregister(); |
35df2755 CB |
3392 | |
3393 | DBG("Client thread dying"); | |
f6a9efaa DG |
3394 | |
3395 | rcu_unregister_thread(); | |
1d4b027a DG |
3396 | return NULL; |
3397 | } | |
3398 | ||
3399 | ||
fac6795d DG |
3400 | /* |
3401 | * usage function on stderr | |
3402 | */ | |
3403 | static void usage(void) | |
3404 | { | |
b716ce68 | 3405 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3406 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3407 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3408 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3409 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3410 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3411 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3412 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3413 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3414 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3415 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3416 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3417 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3418 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3419 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3420 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3421 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3422 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3423 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3424 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3425 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3426 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3427 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3428 | } |
3429 | ||
3430 | /* | |
3431 | * daemon argument parsing | |
3432 | */ | |
3433 | static int parse_args(int argc, char **argv) | |
3434 | { | |
3435 | int c; | |
3436 | ||
3437 | static struct option long_options[] = { | |
3438 | { "client-sock", 1, 0, 'c' }, | |
3439 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3440 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3441 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3442 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3443 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3444 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3445 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3446 | { "consumerd32-path", 1, 0, 'u' }, | |
3447 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3448 | { "consumerd64-path", 1, 0, 't' }, | |
3449 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3450 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3451 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3452 | { "help", 0, 0, 'h' }, |
3453 | { "group", 1, 0, 'g' }, | |
3454 | { "version", 0, 0, 'V' }, | |
75462a81 | 3455 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3456 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3457 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3458 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3459 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3460 | { NULL, 0, 0, 0 } |
3461 | }; | |
3462 | ||
3463 | while (1) { | |
3464 | int option_index = 0; | |
35f90c40 | 3465 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3466 | long_options, &option_index); |
fac6795d DG |
3467 | if (c == -1) { |
3468 | break; | |
3469 | } | |
3470 | ||
3471 | switch (c) { | |
3472 | case 0: | |
3473 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3474 | if (optarg) { | |
3475 | fprintf(stderr, " with arg %s\n", optarg); | |
3476 | } | |
3477 | break; | |
b716ce68 | 3478 | case 'c': |
fac6795d DG |
3479 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3480 | break; | |
3481 | case 'a': | |
3482 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3483 | break; | |
3484 | case 'd': | |
3485 | opt_daemon = 1; | |
3486 | break; | |
3487 | case 'g': | |
fb09408a | 3488 | opt_tracing_group = optarg; |
fac6795d DG |
3489 | break; |
3490 | case 'h': | |
3491 | usage(); | |
3492 | exit(EXIT_FAILURE); | |
3493 | case 'V': | |
3494 | fprintf(stdout, "%s\n", VERSION); | |
3495 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3496 | case 'S': |
3497 | opt_sig_parent = 1; | |
3498 | break; | |
d6f42150 | 3499 | case 'E': |
3bd1e081 | 3500 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3501 | break; |
3502 | case 'C': | |
3bd1e081 MD |
3503 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3504 | break; | |
3505 | case 'F': | |
7753dea8 | 3506 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3507 | break; |
3508 | case 'D': | |
7753dea8 MD |
3509 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3510 | break; | |
3511 | case 'H': | |
3512 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3513 | break; | |
3514 | case 'G': | |
3515 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3516 | break; |
4fba7219 DG |
3517 | case 'N': |
3518 | opt_no_kernel = 1; | |
3519 | break; | |
75462a81 | 3520 | case 'q': |
97e19046 | 3521 | lttng_opt_quiet = 1; |
75462a81 | 3522 | break; |
3f9947db | 3523 | case 'v': |
53086306 | 3524 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3525 | lttng_opt_verbose += 1; |
3f9947db | 3526 | break; |
31f73cc9 | 3527 | case 'Z': |
3bd1e081 | 3528 | opt_verbose_consumer += 1; |
31f73cc9 | 3529 | break; |
fb09408a | 3530 | case 'u': |
fc7a59ce | 3531 | consumerd32_bin= optarg; |
ebaeda94 MD |
3532 | break; |
3533 | case 'U': | |
3534 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3535 | break; |
3536 | case 't': | |
fc7a59ce | 3537 | consumerd64_bin = optarg; |
ebaeda94 MD |
3538 | break; |
3539 | case 'T': | |
3540 | consumerd64_libdir = optarg; | |
fb09408a | 3541 | break; |
35f90c40 DG |
3542 | case 'p': |
3543 | opt_pidfile = optarg; | |
3544 | break; | |
fac6795d DG |
3545 | default: |
3546 | /* Unknown option or other error. | |
3547 | * Error is printed by getopt, just return */ | |
3548 | return -1; | |
3549 | } | |
3550 | } | |
3551 | ||
3552 | return 0; | |
3553 | } | |
3554 | ||
3555 | /* | |
d063d709 | 3556 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3557 | * apps_sock - The communication socket for all UST apps. |
3558 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3559 | */ |
cf3af59e | 3560 | static int init_daemon_socket(void) |
fac6795d DG |
3561 | { |
3562 | int ret = 0; | |
3563 | mode_t old_umask; | |
3564 | ||
3565 | old_umask = umask(0); | |
3566 | ||
3567 | /* Create client tool unix socket */ | |
d6f42150 DG |
3568 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3569 | if (client_sock < 0) { | |
3570 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3571 | ret = -1; |
3572 | goto end; | |
3573 | } | |
3574 | ||
b662582b DG |
3575 | /* Set the cloexec flag */ |
3576 | ret = utils_set_fd_cloexec(client_sock); | |
3577 | if (ret < 0) { | |
3578 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3579 | "Continuing but note that the consumer daemon will have a " | |
3580 | "reference to this socket on exec()", client_sock); | |
3581 | } | |
3582 | ||
fac6795d DG |
3583 | /* File permission MUST be 660 */ |
3584 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3585 | if (ret < 0) { | |
d6f42150 | 3586 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 3587 | PERROR("chmod"); |
fac6795d DG |
3588 | goto end; |
3589 | } | |
3590 | ||
3591 | /* Create the application unix socket */ | |
d6f42150 DG |
3592 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3593 | if (apps_sock < 0) { | |
3594 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3595 | ret = -1; |
3596 | goto end; | |
3597 | } | |
3598 | ||
b662582b DG |
3599 | /* Set the cloexec flag */ |
3600 | ret = utils_set_fd_cloexec(apps_sock); | |
3601 | if (ret < 0) { | |
3602 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
3603 | "Continuing but note that the consumer daemon will have a " | |
3604 | "reference to this socket on exec()", apps_sock); | |
3605 | } | |
3606 | ||
d6f42150 | 3607 | /* File permission MUST be 666 */ |
54d01ffb DG |
3608 | ret = chmod(apps_unix_sock_path, |
3609 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3610 | if (ret < 0) { |
d6f42150 | 3611 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 3612 | PERROR("chmod"); |
fac6795d DG |
3613 | goto end; |
3614 | } | |
3615 | ||
b662582b DG |
3616 | DBG3("Session daemon client socket %d and application socket %d created", |
3617 | client_sock, apps_sock); | |
3618 | ||
fac6795d DG |
3619 | end: |
3620 | umask(old_umask); | |
3621 | return ret; | |
3622 | } | |
3623 | ||
3624 | /* | |
54d01ffb DG |
3625 | * Check if the global socket is available, and if a daemon is answering at the |
3626 | * other side. If yes, error is returned. | |
fac6795d | 3627 | */ |
cf3af59e | 3628 | static int check_existing_daemon(void) |
fac6795d | 3629 | { |
7d8234d9 | 3630 | /* Is there anybody out there ? */ |
099e26bd | 3631 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3632 | return -EEXIST; |
099e26bd | 3633 | } |
b09c7c76 DG |
3634 | |
3635 | return 0; | |
fac6795d DG |
3636 | } |
3637 | ||
fac6795d | 3638 | /* |
d063d709 | 3639 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3640 | * |
d063d709 | 3641 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3642 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3643 | */ |
be040666 | 3644 | static int set_permissions(char *rundir) |
fac6795d DG |
3645 | { |
3646 | int ret; | |
996b65c8 | 3647 | gid_t gid; |
fac6795d | 3648 | |
6775595e DG |
3649 | ret = allowed_group(); |
3650 | if (ret < 0) { | |
be040666 DG |
3651 | WARN("No tracing group detected"); |
3652 | ret = 0; | |
fac6795d DG |
3653 | goto end; |
3654 | } | |
3655 | ||
6775595e DG |
3656 | gid = ret; |
3657 | ||
d6f42150 | 3658 | /* Set lttng run dir */ |
be040666 | 3659 | ret = chown(rundir, 0, gid); |
d6f42150 | 3660 | if (ret < 0) { |
be040666 | 3661 | ERR("Unable to set group on %s", rundir); |
76d7553f | 3662 | PERROR("chown"); |
d6f42150 DG |
3663 | } |
3664 | ||
d1613cf5 | 3665 | /* Ensure tracing group can search the run dir */ |
61076f74 | 3666 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
3667 | if (ret < 0) { |
3668 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 3669 | PERROR("chmod"); |
d1613cf5 JN |
3670 | } |
3671 | ||
d6f42150 | 3672 | /* lttng client socket path */ |
996b65c8 | 3673 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3674 | if (ret < 0) { |
d6f42150 | 3675 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 3676 | PERROR("chown"); |
d6f42150 DG |
3677 | } |
3678 | ||
3bd1e081 MD |
3679 | /* kconsumer error socket path */ |
3680 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3681 | if (ret < 0) { |
3bd1e081 | 3682 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 3683 | PERROR("chown"); |
3bd1e081 MD |
3684 | } |
3685 | ||
7753dea8 MD |
3686 | /* 64-bit ustconsumer error socket path */ |
3687 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3688 | if (ret < 0) { | |
3689 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 3690 | PERROR("chown"); |
7753dea8 MD |
3691 | } |
3692 | ||
3693 | /* 32-bit ustconsumer compat32 error socket path */ | |
3694 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3695 | if (ret < 0) { |
7753dea8 | 3696 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 3697 | PERROR("chown"); |
fac6795d DG |
3698 | } |
3699 | ||
d6f42150 | 3700 | DBG("All permissions are set"); |
e07ae692 | 3701 | |
fac6795d DG |
3702 | end: |
3703 | return ret; | |
3704 | } | |
3705 | ||
d6f42150 | 3706 | /* |
d063d709 | 3707 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 3708 | */ |
67e40797 | 3709 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
3710 | { |
3711 | int ret; | |
3712 | ||
67e40797 DG |
3713 | DBG3("Creating LTTng run directory: %s", rundir); |
3714 | ||
d1613cf5 | 3715 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 3716 | if (ret < 0) { |
b1f11e69 | 3717 | if (errno != EEXIST) { |
67e40797 | 3718 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
3719 | goto error; |
3720 | } else { | |
3721 | ret = 0; | |
3722 | } | |
d6f42150 DG |
3723 | } |
3724 | ||
3725 | error: | |
3726 | return ret; | |
3727 | } | |
3728 | ||
3729 | /* | |
d063d709 DG |
3730 | * Setup sockets and directory needed by the kconsumerd communication with the |
3731 | * session daemon. | |
d6f42150 | 3732 | */ |
67e40797 DG |
3733 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
3734 | const char *rundir) | |
d6f42150 DG |
3735 | { |
3736 | int ret; | |
67e40797 | 3737 | char path[PATH_MAX]; |
d6f42150 | 3738 | |
67e40797 | 3739 | switch (consumer_data->type) { |
7753dea8 | 3740 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 3741 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
3742 | break; |
3743 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 3744 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
3745 | break; |
3746 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 3747 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
3748 | break; |
3749 | default: | |
3750 | ERR("Consumer type unknown"); | |
3751 | ret = -EINVAL; | |
3752 | goto error; | |
d6f42150 DG |
3753 | } |
3754 | ||
67e40797 DG |
3755 | DBG2("Creating consumer directory: %s", path); |
3756 | ||
d1613cf5 | 3757 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 3758 | if (ret < 0) { |
6beb2242 | 3759 | if (errno != EEXIST) { |
f11e84c2 | 3760 | PERROR("mkdir"); |
3bd1e081 | 3761 | ERR("Failed to create %s", path); |
6beb2242 DG |
3762 | goto error; |
3763 | } | |
f11e84c2 | 3764 | ret = -1; |
d6f42150 DG |
3765 | } |
3766 | ||
3767 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3768 | consumer_data->err_sock = |
3769 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3770 | if (consumer_data->err_sock < 0) { | |
3771 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3772 | ret = -1; |
3773 | goto error; | |
3774 | } | |
3775 | ||
3776 | /* File permission MUST be 660 */ | |
3bd1e081 | 3777 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3778 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3779 | if (ret < 0) { |
3bd1e081 | 3780 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 3781 | PERROR("chmod"); |
d6f42150 DG |
3782 | goto error; |
3783 | } | |
3784 | ||
3785 | error: | |
3786 | return ret; | |
3787 | } | |
3788 | ||
fac6795d | 3789 | /* |
d063d709 | 3790 | * Signal handler for the daemon |
cf3af59e | 3791 | * |
54d01ffb DG |
3792 | * Simply stop all worker threads, leaving main() return gracefully after |
3793 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3794 | */ |
3795 | static void sighandler(int sig) | |
3796 | { | |
3797 | switch (sig) { | |
cf3af59e | 3798 | case SIGPIPE: |
af87c45a | 3799 | DBG("SIGPIPE caught"); |
cf3af59e MD |
3800 | return; |
3801 | case SIGINT: | |
af87c45a | 3802 | DBG("SIGINT caught"); |
cf3af59e MD |
3803 | stop_threads(); |
3804 | break; | |
3805 | case SIGTERM: | |
af87c45a | 3806 | DBG("SIGTERM caught"); |
cf3af59e MD |
3807 | stop_threads(); |
3808 | break; | |
3809 | default: | |
3810 | break; | |
fac6795d | 3811 | } |
fac6795d DG |
3812 | } |
3813 | ||
3814 | /* | |
d063d709 | 3815 | * Setup signal handler for : |
1d4b027a | 3816 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3817 | */ |
1d4b027a | 3818 | static int set_signal_handler(void) |
fac6795d | 3819 | { |
1d4b027a DG |
3820 | int ret = 0; |
3821 | struct sigaction sa; | |
3822 | sigset_t sigset; | |
fac6795d | 3823 | |
1d4b027a | 3824 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 3825 | PERROR("sigemptyset"); |
1d4b027a DG |
3826 | return ret; |
3827 | } | |
d6f42150 | 3828 | |
1d4b027a DG |
3829 | sa.sa_handler = sighandler; |
3830 | sa.sa_mask = sigset; | |
3831 | sa.sa_flags = 0; | |
3832 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 3833 | PERROR("sigaction"); |
1d4b027a | 3834 | return ret; |
d6f42150 DG |
3835 | } |
3836 | ||
1d4b027a | 3837 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 3838 | PERROR("sigaction"); |
1d4b027a | 3839 | return ret; |
d6f42150 | 3840 | } |
aaf26714 | 3841 | |
1d4b027a | 3842 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 3843 | PERROR("sigaction"); |
1d4b027a | 3844 | return ret; |
8c0faa1d DG |
3845 | } |
3846 | ||
1d4b027a DG |
3847 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3848 | ||
3849 | return ret; | |
fac6795d DG |
3850 | } |
3851 | ||
f3ed775e | 3852 | /* |
d063d709 DG |
3853 | * Set open files limit to unlimited. This daemon can open a large number of |
3854 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3855 | */ |
3856 | static void set_ulimit(void) | |
3857 | { | |
3858 | int ret; | |
3859 | struct rlimit lim; | |
3860 | ||
a88df331 | 3861 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3862 | lim.rlim_cur = 65535; |
3863 | lim.rlim_max = 65535; | |
3864 | ||
3865 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3866 | if (ret < 0) { | |
76d7553f | 3867 | PERROR("failed to set open files limit"); |
f3ed775e DG |
3868 | } |
3869 | } | |
3870 | ||
35f90c40 DG |
3871 | /* |
3872 | * Write pidfile using the rundir and opt_pidfile. | |
3873 | */ | |
3874 | static void write_pidfile(void) | |
3875 | { | |
3876 | int ret; | |
3877 | char pidfile_path[PATH_MAX]; | |
3878 | ||
3879 | assert(rundir); | |
3880 | ||
3881 | if (opt_pidfile) { | |
3882 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
3883 | } else { | |
3884 | /* Build pidfile path from rundir and opt_pidfile. */ | |
3885 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
3886 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
3887 | if (ret < 0) { | |
3888 | PERROR("snprintf pidfile path"); | |
3889 | goto error; | |
3890 | } | |
3891 | } | |
3892 | ||
3893 | /* | |
3894 | * Create pid file in rundir. Return value is of no importance. The | |
3895 | * execution will continue even though we are not able to write the file. | |
3896 | */ | |
3897 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
3898 | ||
3899 | error: | |
3900 | return; | |
3901 | } | |
3902 | ||
fac6795d DG |
3903 | /* |
3904 | * main | |
3905 | */ | |
3906 | int main(int argc, char **argv) | |
3907 | { | |
fac6795d DG |
3908 | int ret = 0; |
3909 | void *status; | |
ae9e45b3 | 3910 | const char *home_path, *env_app_timeout; |
fac6795d | 3911 | |
335a95b7 MD |
3912 | init_kernel_workarounds(); |
3913 | ||
f6a9efaa DG |
3914 | rcu_register_thread(); |
3915 | ||
7753dea8 | 3916 | setup_consumerd_path(); |
fb09408a | 3917 | |
fac6795d DG |
3918 | /* Parse arguments */ |
3919 | progname = argv[0]; | |
c617c0c6 | 3920 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 3921 | goto error; |
fac6795d DG |
3922 | } |
3923 | ||
3924 | /* Daemonize */ | |
3925 | if (opt_daemon) { | |
ceed52b5 MD |
3926 | int i; |
3927 | ||
3928 | /* | |
3929 | * fork | |
3930 | * child: setsid, close FD 0, 1, 2, chdir / | |
3931 | * parent: exit (if fork is successful) | |
3932 | */ | |
53094c05 DG |
3933 | ret = daemon(0, 0); |
3934 | if (ret < 0) { | |
76d7553f | 3935 | PERROR("daemon"); |
cf3af59e | 3936 | goto error; |
53094c05 | 3937 | } |
ceed52b5 MD |
3938 | /* |
3939 | * We are in the child. Make sure all other file | |
3940 | * descriptors are closed, in case we are called with | |
3941 | * more opened file descriptors than the standard ones. | |
3942 | */ | |
3943 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
3944 | (void) close(i); | |
3945 | } | |
3946 | } | |
3947 | ||
3948 | /* Create thread quit pipe */ | |
3949 | if ((ret = init_thread_quit_pipe()) < 0) { | |
3950 | goto error; | |
fac6795d DG |
3951 | } |
3952 | ||
3953 | /* Check if daemon is UID = 0 */ | |
3954 | is_root = !getuid(); | |
3955 | ||
fac6795d | 3956 | if (is_root) { |
990570ed | 3957 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
3958 | |
3959 | /* Create global run dir with root access */ | |
3960 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 3961 | if (ret < 0) { |
cf3af59e | 3962 | goto error; |
d6f42150 DG |
3963 | } |
3964 | ||
fac6795d | 3965 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3966 | snprintf(apps_unix_sock_path, PATH_MAX, |
3967 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3968 | } |
3969 | ||
3970 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3971 | snprintf(client_unix_sock_path, PATH_MAX, |
3972 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3973 | } | |
0fdd1e2c DG |
3974 | |
3975 | /* Set global SHM for ust */ | |
3976 | if (strlen(wait_shm_path) == 0) { | |
3977 | snprintf(wait_shm_path, PATH_MAX, | |
3978 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3979 | } | |
67e40797 | 3980 | |
44a5e5eb DG |
3981 | if (strlen(health_unix_sock_path) == 0) { |
3982 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3983 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
3984 | } | |
3985 | ||
67e40797 DG |
3986 | /* Setup kernel consumerd path */ |
3987 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3988 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 3989 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3990 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3991 | |
3992 | DBG2("Kernel consumer err path: %s", | |
3993 | kconsumer_data.err_unix_sock_path); | |
3994 | DBG2("Kernel consumer cmd path: %s", | |
3995 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 3996 | } else { |
b082db07 DG |
3997 | home_path = get_home_dir(); |
3998 | if (home_path == NULL) { | |
273ea72c DG |
3999 | /* TODO: Add --socket PATH option */ |
4000 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4001 | ret = -EPERM; |
4002 | goto error; | |
b082db07 DG |
4003 | } |
4004 | ||
67e40797 DG |
4005 | /* |
4006 | * Create rundir from home path. This will create something like | |
4007 | * $HOME/.lttng | |
4008 | */ | |
990570ed | 4009 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4010 | if (ret < 0) { |
4011 | ret = -ENOMEM; | |
4012 | goto error; | |
4013 | } | |
4014 | ||
4015 | ret = create_lttng_rundir(rundir); | |
4016 | if (ret < 0) { | |
4017 | goto error; | |
4018 | } | |
4019 | ||
fac6795d | 4020 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4021 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4022 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4023 | } |
4024 | ||
4025 | /* Set the cli tool unix socket path */ | |
4026 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4027 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4028 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4029 | } |
0fdd1e2c DG |
4030 | |
4031 | /* Set global SHM for ust */ | |
4032 | if (strlen(wait_shm_path) == 0) { | |
4033 | snprintf(wait_shm_path, PATH_MAX, | |
4034 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4035 | } | |
44a5e5eb DG |
4036 | |
4037 | /* Set health check Unix path */ | |
4038 | if (strlen(health_unix_sock_path) == 0) { | |
4039 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4040 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4041 | } | |
fac6795d DG |
4042 | } |
4043 | ||
5c827ce0 DG |
4044 | /* Set consumer initial state */ |
4045 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4046 | ust_consumerd_state = CONSUMER_STOPPED; | |
4047 | ||
847177cd DG |
4048 | DBG("Client socket path %s", client_unix_sock_path); |
4049 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4050 | DBG("LTTng run directory path: %s", rundir); |
4051 | ||
4052 | /* 32 bits consumerd path setup */ | |
4053 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4054 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4055 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4056 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4057 | |
4058 | DBG2("UST consumer 32 bits err path: %s", | |
4059 | ustconsumer32_data.err_unix_sock_path); | |
4060 | DBG2("UST consumer 32 bits cmd path: %s", | |
4061 | ustconsumer32_data.cmd_unix_sock_path); | |
4062 | ||
4063 | /* 64 bits consumerd path setup */ | |
4064 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4065 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4066 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4067 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4068 | |
4069 | DBG2("UST consumer 64 bits err path: %s", | |
4070 | ustconsumer64_data.err_unix_sock_path); | |
4071 | DBG2("UST consumer 64 bits cmd path: %s", | |
4072 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4073 | |
273ea72c | 4074 | /* |
7d8234d9 | 4075 | * See if daemon already exist. |
fac6795d | 4076 | */ |
7d8234d9 | 4077 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4078 | ERR("Already running daemon.\n"); |
273ea72c | 4079 | /* |
cf3af59e MD |
4080 | * We do not goto exit because we must not cleanup() |
4081 | * because a daemon is already running. | |
ab118b20 | 4082 | */ |
cf3af59e | 4083 | goto error; |
a88df331 DG |
4084 | } |
4085 | ||
1427f9b2 DG |
4086 | /* |
4087 | * Init UST app hash table. Alloc hash table before this point since | |
4088 | * cleanup() can get called after that point. | |
4089 | */ | |
4090 | ust_app_ht_alloc(); | |
4091 | ||
54d01ffb | 4092 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4093 | |
4094 | /* | |
4095 | * These actions must be executed as root. We do that *after* setting up | |
4096 | * the sockets path because we MUST make the check for another daemon using | |
4097 | * those paths *before* trying to set the kernel consumer sockets and init | |
4098 | * kernel tracer. | |
4099 | */ | |
4100 | if (is_root) { | |
67e40797 | 4101 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4102 | if (ret < 0) { |
4103 | goto exit; | |
4104 | } | |
4105 | ||
a88df331 | 4106 | /* Setup kernel tracer */ |
4fba7219 DG |
4107 | if (!opt_no_kernel) { |
4108 | init_kernel_tracer(); | |
4109 | } | |
a88df331 DG |
4110 | |
4111 | /* Set ulimit for open files */ | |
4112 | set_ulimit(); | |
fac6795d | 4113 | } |
4063050c MD |
4114 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4115 | lttng_fd_init(); | |
fac6795d | 4116 | |
67e40797 DG |
4117 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4118 | if (ret < 0) { | |
4119 | goto exit; | |
4120 | } | |
4121 | ||
4122 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4123 | if (ret < 0) { | |
4124 | goto exit; | |
4125 | } | |
4126 | ||
cf3af59e MD |
4127 | if ((ret = set_signal_handler()) < 0) { |
4128 | goto exit; | |
fac6795d DG |
4129 | } |
4130 | ||
d6f42150 | 4131 | /* Setup the needed unix socket */ |
cf3af59e MD |
4132 | if ((ret = init_daemon_socket()) < 0) { |
4133 | goto exit; | |
fac6795d DG |
4134 | } |
4135 | ||
4136 | /* Set credentials to socket */ | |
be040666 | 4137 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4138 | goto exit; |
fac6795d DG |
4139 | } |
4140 | ||
5b8719f5 DG |
4141 | /* Get parent pid if -S, --sig-parent is specified. */ |
4142 | if (opt_sig_parent) { | |
4143 | ppid = getppid(); | |
4144 | } | |
4145 | ||
7a485870 | 4146 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4147 | if (is_root && !opt_no_kernel) { |
4148 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4149 | goto exit; | |
4150 | } | |
7a485870 DG |
4151 | } |
4152 | ||
099e26bd | 4153 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4154 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4155 | goto exit; |
4156 | } | |
4157 | ||
4158 | /* Init UST command queue. */ | |
4159 | cds_wfq_init(&ust_cmd_queue.queue); | |
4160 | ||
273ea72c | 4161 | /* |
54d01ffb DG |
4162 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4163 | * statically declared in session.c | |
273ea72c | 4164 | */ |
54d01ffb | 4165 | session_list_ptr = session_get_list(); |
b5541356 | 4166 | |
5eb91c98 DG |
4167 | /* Set up max poll set size */ |
4168 | lttng_poll_set_max_size(); | |
4169 | ||
2f77fc4b | 4170 | cmd_init(); |
00e2e675 | 4171 | |
ae9e45b3 DG |
4172 | /* Check for the application socket timeout env variable. */ |
4173 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4174 | if (env_app_timeout) { | |
4175 | app_socket_timeout = atoi(env_app_timeout); | |
4176 | } else { | |
4177 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4178 | } | |
4179 | ||
35f90c40 DG |
4180 | write_pidfile(); |
4181 | ||
44a5e5eb DG |
4182 | /* Create thread to manage the client socket */ |
4183 | ret = pthread_create(&health_thread, NULL, | |
4184 | thread_manage_health, (void *) NULL); | |
4185 | if (ret != 0) { | |
4186 | PERROR("pthread_create health"); | |
4187 | goto exit_health; | |
4188 | } | |
4189 | ||
cf3af59e | 4190 | /* Create thread to manage the client socket */ |
099e26bd DG |
4191 | ret = pthread_create(&client_thread, NULL, |
4192 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4193 | if (ret != 0) { |
76d7553f | 4194 | PERROR("pthread_create clients"); |
cf3af59e MD |
4195 | goto exit_client; |
4196 | } | |
fac6795d | 4197 | |
099e26bd DG |
4198 | /* Create thread to dispatch registration */ |
4199 | ret = pthread_create(&dispatch_thread, NULL, | |
4200 | thread_dispatch_ust_registration, (void *) NULL); | |
4201 | if (ret != 0) { | |
76d7553f | 4202 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4203 | goto exit_dispatch; |
4204 | } | |
4205 | ||
4206 | /* Create thread to manage application registration. */ | |
4207 | ret = pthread_create(®_apps_thread, NULL, | |
4208 | thread_registration_apps, (void *) NULL); | |
4209 | if (ret != 0) { | |
76d7553f | 4210 | PERROR("pthread_create registration"); |
099e26bd DG |
4211 | goto exit_reg_apps; |
4212 | } | |
4213 | ||
cf3af59e | 4214 | /* Create thread to manage application socket */ |
54d01ffb DG |
4215 | ret = pthread_create(&apps_thread, NULL, |
4216 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4217 | if (ret != 0) { |
76d7553f | 4218 | PERROR("pthread_create apps"); |
cf3af59e MD |
4219 | goto exit_apps; |
4220 | } | |
fac6795d | 4221 | |
6620da75 DG |
4222 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4223 | if (is_root && !opt_no_kernel) { | |
4224 | /* Create kernel thread to manage kernel event */ | |
4225 | ret = pthread_create(&kernel_thread, NULL, | |
4226 | thread_manage_kernel, (void *) NULL); | |
4227 | if (ret != 0) { | |
4228 | PERROR("pthread_create kernel"); | |
4229 | goto exit_kernel; | |
4230 | } | |
7a485870 | 4231 | |
6620da75 DG |
4232 | ret = pthread_join(kernel_thread, &status); |
4233 | if (ret != 0) { | |
4234 | PERROR("pthread_join"); | |
4235 | goto error; /* join error, exit without cleanup */ | |
4236 | } | |
fac6795d DG |
4237 | } |
4238 | ||
cf3af59e MD |
4239 | exit_kernel: |
4240 | ret = pthread_join(apps_thread, &status); | |
4241 | if (ret != 0) { | |
76d7553f | 4242 | PERROR("pthread_join"); |
cf3af59e MD |
4243 | goto error; /* join error, exit without cleanup */ |
4244 | } | |
fac6795d | 4245 | |
cf3af59e | 4246 | exit_apps: |
099e26bd DG |
4247 | ret = pthread_join(reg_apps_thread, &status); |
4248 | if (ret != 0) { | |
76d7553f | 4249 | PERROR("pthread_join"); |
099e26bd DG |
4250 | goto error; /* join error, exit without cleanup */ |
4251 | } | |
4252 | ||
4253 | exit_reg_apps: | |
4254 | ret = pthread_join(dispatch_thread, &status); | |
4255 | if (ret != 0) { | |
76d7553f | 4256 | PERROR("pthread_join"); |
099e26bd DG |
4257 | goto error; /* join error, exit without cleanup */ |
4258 | } | |
4259 | ||
4260 | exit_dispatch: | |
cf3af59e MD |
4261 | ret = pthread_join(client_thread, &status); |
4262 | if (ret != 0) { | |
76d7553f | 4263 | PERROR("pthread_join"); |
cf3af59e MD |
4264 | goto error; /* join error, exit without cleanup */ |
4265 | } | |
4266 | ||
3bd1e081 | 4267 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4268 | if (ret != 0) { |
76d7553f | 4269 | PERROR("join_consumer"); |
cf3af59e MD |
4270 | goto error; /* join error, exit without cleanup */ |
4271 | } | |
a88df331 | 4272 | |
06f525de DG |
4273 | ret = join_consumer_thread(&ustconsumer32_data); |
4274 | if (ret != 0) { | |
4275 | PERROR("join_consumer ust32"); | |
4276 | goto error; /* join error, exit without cleanup */ | |
4277 | } | |
4278 | ||
4279 | ret = join_consumer_thread(&ustconsumer64_data); | |
4280 | if (ret != 0) { | |
4281 | PERROR("join_consumer ust64"); | |
4282 | goto error; /* join error, exit without cleanup */ | |
4283 | } | |
4284 | ||
cf3af59e | 4285 | exit_client: |
06f525de DG |
4286 | ret = pthread_join(health_thread, &status); |
4287 | if (ret != 0) { | |
4288 | PERROR("pthread_join health thread"); | |
4289 | goto error; /* join error, exit without cleanup */ | |
4290 | } | |
4291 | ||
44a5e5eb | 4292 | exit_health: |
a88df331 | 4293 | exit: |
cf3af59e MD |
4294 | /* |
4295 | * cleanup() is called when no other thread is running. | |
4296 | */ | |
f6a9efaa | 4297 | rcu_thread_online(); |
cf3af59e | 4298 | cleanup(); |
f6a9efaa DG |
4299 | rcu_thread_offline(); |
4300 | rcu_unregister_thread(); | |
67e40797 | 4301 | if (!ret) { |
cf3af59e | 4302 | exit(EXIT_SUCCESS); |
67e40797 | 4303 | } |
cf3af59e | 4304 | error: |
5e16da05 | 4305 | exit(EXIT_FAILURE); |
fac6795d | 4306 | } |