Commit | Line | Data |
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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; | |
5b8719f5 | 75 | static int opt_sig_parent; |
97e19046 | 76 | static int opt_verbose_consumer; |
fac6795d | 77 | static int opt_daemon; |
4fba7219 | 78 | static int opt_no_kernel; |
fac6795d | 79 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 80 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 81 | static char *rundir; |
3bd1e081 | 82 | |
a23ec3a7 DG |
83 | /* |
84 | * Consumer daemon specific control data. Every value not initialized here is | |
85 | * set to 0 by the static definition. | |
86 | */ | |
3bd1e081 MD |
87 | static struct consumer_data kconsumer_data = { |
88 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
89 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
90 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
91 | .err_sock = -1, |
92 | .cmd_sock = -1, | |
173af62f DG |
93 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
94 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
95 | .cond = PTHREAD_COND_INITIALIZER, |
96 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 97 | }; |
7753dea8 MD |
98 | static struct consumer_data ustconsumer64_data = { |
99 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
100 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
101 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
102 | .err_sock = -1, |
103 | .cmd_sock = -1, | |
173af62f DG |
104 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
105 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
106 | .cond = PTHREAD_COND_INITIALIZER, |
107 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
108 | }; |
109 | static struct consumer_data ustconsumer32_data = { | |
110 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
111 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
112 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
113 | .err_sock = -1, |
114 | .cmd_sock = -1, | |
173af62f DG |
115 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
116 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
117 | .cond = PTHREAD_COND_INITIALIZER, |
118 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
119 | }; |
120 | ||
26c9d55e | 121 | /* Shared between threads */ |
099e26bd | 122 | static int dispatch_thread_exit; |
fac6795d | 123 | |
54d01ffb DG |
124 | /* Global application Unix socket path */ |
125 | static char apps_unix_sock_path[PATH_MAX]; | |
126 | /* Global client Unix socket path */ | |
127 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
128 | /* global wait shm path for UST */ |
129 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
130 | /* Global health check unix path */ |
131 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 132 | |
1d4b027a | 133 | /* Sockets and FDs */ |
a4b35e07 MD |
134 | static int client_sock = -1; |
135 | static int apps_sock = -1; | |
2f77fc4b | 136 | int kernel_tracer_fd = -1; |
76d7553f | 137 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 138 | |
273ea72c DG |
139 | /* |
140 | * Quit pipe for all threads. This permits a single cancellation point | |
141 | * for all threads when receiving an event on the pipe. | |
142 | */ | |
76d7553f | 143 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 144 | |
099e26bd DG |
145 | /* |
146 | * This pipe is used to inform the thread managing application communication | |
147 | * that a command is queued and ready to be processed. | |
148 | */ | |
76d7553f | 149 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 150 | |
1d4b027a | 151 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 152 | static pthread_t apps_thread; |
099e26bd | 153 | static pthread_t reg_apps_thread; |
1d4b027a | 154 | static pthread_t client_thread; |
7a485870 | 155 | static pthread_t kernel_thread; |
099e26bd | 156 | static pthread_t dispatch_thread; |
44a5e5eb | 157 | static pthread_t health_thread; |
5eb91c98 | 158 | |
099e26bd DG |
159 | /* |
160 | * UST registration command queue. This queue is tied with a futex and uses a N | |
161 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
162 | * | |
163 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
164 | * this queue and the wait/wake scheme. | |
165 | */ | |
166 | static struct ust_cmd_queue ust_cmd_queue; | |
167 | ||
b5541356 DG |
168 | /* |
169 | * Pointer initialized before thread creation. | |
170 | * | |
171 | * This points to the tracing session list containing the session count and a | |
172 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
173 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 174 | * |
d063d709 | 175 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 176 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
177 | */ |
178 | static struct ltt_session_list *session_list_ptr; | |
179 | ||
7753dea8 MD |
180 | int ust_consumerd64_fd = -1; |
181 | int ust_consumerd32_fd = -1; | |
182 | ||
fb6f1fa2 YB |
183 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
184 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
185 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
186 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 187 | |
2f77fc4b DG |
188 | static const char *module_proc_lttng = "/proc/lttng"; |
189 | ||
5c827ce0 DG |
190 | /* |
191 | * Consumer daemon state which is changed when spawning it, killing it or in | |
192 | * case of a fatal error. | |
193 | */ | |
194 | enum consumerd_state { | |
195 | CONSUMER_STARTED = 1, | |
196 | CONSUMER_STOPPED = 2, | |
197 | CONSUMER_ERROR = 3, | |
198 | }; | |
199 | ||
200 | /* | |
201 | * This consumer daemon state is used to validate if a client command will be | |
202 | * able to reach the consumer. If not, the client is informed. For instance, | |
203 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
204 | * error to the client. | |
205 | * | |
206 | * The following example shows a possible race condition of this scheme: | |
207 | * | |
208 | * consumer thread error happens | |
209 | * client cmd arrives | |
210 | * client cmd checks state -> still OK | |
211 | * consumer thread exit, sets error | |
212 | * client cmd try to talk to consumer | |
213 | * ... | |
214 | * | |
215 | * However, since the consumer is a different daemon, we have no way of making | |
216 | * sure the command will reach it safely even with this state flag. This is why | |
217 | * we consider that up to the state validation during command processing, the | |
218 | * command is safe. After that, we can not guarantee the correctness of the | |
219 | * client request vis-a-vis the consumer. | |
220 | */ | |
221 | static enum consumerd_state ust_consumerd_state; | |
222 | static enum consumerd_state kernel_consumerd_state; | |
223 | ||
44a5e5eb DG |
224 | /* Used for the health monitoring of the session daemon. See health.h */ |
225 | struct health_state health_thread_cmd; | |
139ac872 | 226 | struct health_state health_thread_app_manage; |
44a5e5eb DG |
227 | struct health_state health_thread_app_reg; |
228 | struct health_state health_thread_kernel; | |
229 | ||
ae9e45b3 DG |
230 | /* |
231 | * Socket timeout for receiving and sending in seconds. | |
232 | */ | |
233 | static int app_socket_timeout; | |
234 | ||
fb09408a | 235 | static |
7753dea8 | 236 | void setup_consumerd_path(void) |
fb09408a | 237 | { |
fc7a59ce | 238 | const char *bin, *libdir; |
fb09408a | 239 | |
7753dea8 MD |
240 | /* |
241 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
242 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
243 | * has not been defined. | |
7753dea8 | 244 | */ |
ebaeda94 | 245 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
246 | if (!consumerd32_bin[0]) { |
247 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
248 | } |
249 | if (!consumerd32_libdir[0]) { | |
250 | consumerd32_libdir = INSTALL_LIB_PATH; | |
251 | } | |
252 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
253 | if (!consumerd64_bin[0]) { |
254 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 255 | } |
ebaeda94 MD |
256 | if (!consumerd64_libdir[0]) { |
257 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
258 | } |
259 | #else | |
260 | #error "Unknown bitness" | |
261 | #endif | |
262 | ||
fb09408a MD |
263 | /* |
264 | * runtime env. var. overrides the build default. | |
265 | */ | |
fc7a59ce AM |
266 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
267 | if (bin) { | |
268 | consumerd32_bin = bin; | |
7753dea8 | 269 | } |
fc7a59ce AM |
270 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
271 | if (bin) { | |
272 | consumerd64_bin = bin; | |
ebaeda94 | 273 | } |
72f579ee | 274 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
275 | if (libdir) { |
276 | consumerd32_libdir = libdir; | |
277 | } | |
72f579ee | 278 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
279 | if (libdir) { |
280 | consumerd64_libdir = libdir; | |
fb09408a MD |
281 | } |
282 | } | |
283 | ||
5eb91c98 DG |
284 | /* |
285 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
286 | */ | |
287 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
288 | unsigned int size) | |
289 | { | |
290 | int ret; | |
291 | ||
292 | if (events == NULL || size == 0) { | |
293 | ret = -1; | |
294 | goto error; | |
295 | } | |
296 | ||
297 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
298 | if (ret < 0) { | |
299 | goto error; | |
300 | } | |
301 | ||
302 | /* Add quit pipe */ | |
303 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
304 | if (ret < 0) { | |
305 | goto error; | |
306 | } | |
307 | ||
308 | return 0; | |
309 | ||
310 | error: | |
311 | return ret; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Check if the thread quit pipe was triggered. | |
316 | * | |
317 | * Return 1 if it was triggered else 0; | |
318 | */ | |
319 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
320 | { | |
321 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
322 | return 1; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
0fdd1e2c DG |
328 | /* |
329 | * Return group ID of the tracing group or -1 if not found. | |
330 | */ | |
996b65c8 MD |
331 | static gid_t allowed_group(void) |
332 | { | |
333 | struct group *grp; | |
334 | ||
274e143b MD |
335 | if (opt_tracing_group) { |
336 | grp = getgrnam(opt_tracing_group); | |
337 | } else { | |
338 | grp = getgrnam(default_tracing_group); | |
339 | } | |
996b65c8 MD |
340 | if (!grp) { |
341 | return -1; | |
342 | } else { | |
343 | return grp->gr_gid; | |
344 | } | |
345 | } | |
346 | ||
273ea72c | 347 | /* |
5eb91c98 | 348 | * Init thread quit pipe. |
273ea72c DG |
349 | * |
350 | * Return -1 on error or 0 if all pipes are created. | |
351 | */ | |
352 | static int init_thread_quit_pipe(void) | |
353 | { | |
730389d9 | 354 | int ret, i; |
273ea72c | 355 | |
730389d9 | 356 | ret = pipe(thread_quit_pipe); |
273ea72c | 357 | if (ret < 0) { |
730389d9 | 358 | PERROR("thread quit pipe"); |
273ea72c DG |
359 | goto error; |
360 | } | |
361 | ||
730389d9 DG |
362 | for (i = 0; i < 2; i++) { |
363 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
364 | if (ret < 0) { | |
365 | PERROR("fcntl"); | |
366 | goto error; | |
367 | } | |
368 | } | |
369 | ||
273ea72c DG |
370 | error: |
371 | return ret; | |
372 | } | |
373 | ||
099e26bd DG |
374 | /* |
375 | * Stop all threads by closing the thread quit pipe. | |
376 | */ | |
cf3af59e MD |
377 | static void stop_threads(void) |
378 | { | |
5eb91c98 DG |
379 | int ret; |
380 | ||
cf3af59e MD |
381 | /* Stopping all threads */ |
382 | DBG("Terminating all threads"); | |
54d01ffb | 383 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
384 | if (ret < 0) { |
385 | ERR("write error on thread quit pipe"); | |
386 | } | |
387 | ||
099e26bd | 388 | /* Dispatch thread */ |
26c9d55e | 389 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 390 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
391 | } |
392 | ||
fac6795d | 393 | /* |
d063d709 | 394 | * Cleanup the daemon |
fac6795d | 395 | */ |
cf3af59e | 396 | static void cleanup(void) |
fac6795d | 397 | { |
ef599319 | 398 | int ret; |
6620da75 | 399 | char *cmd = NULL; |
af9737e9 | 400 | struct ltt_session *sess, *stmp; |
fac6795d | 401 | |
1d4b027a | 402 | DBG("Cleaning up"); |
e07ae692 | 403 | |
2f77fc4b DG |
404 | /* First thing first, stop all threads */ |
405 | utils_close_pipe(thread_quit_pipe); | |
406 | ||
67e40797 DG |
407 | DBG("Removing %s directory", rundir); |
408 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
409 | if (ret < 0) { | |
410 | ERR("asprintf failed. Something is really wrong!"); | |
411 | } | |
5461b305 | 412 | |
67e40797 DG |
413 | /* Remove lttng run directory */ |
414 | ret = system(cmd); | |
415 | if (ret < 0) { | |
416 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 417 | } |
67e40797 | 418 | free(cmd); |
bd69add2 | 419 | free(rundir); |
5461b305 | 420 | |
99bab54f | 421 | DBG("Cleaning up all sessions"); |
fac6795d | 422 | |
b5541356 | 423 | /* Destroy session list mutex */ |
273ea72c DG |
424 | if (session_list_ptr != NULL) { |
425 | pthread_mutex_destroy(&session_list_ptr->lock); | |
426 | ||
427 | /* Cleanup ALL session */ | |
54d01ffb DG |
428 | cds_list_for_each_entry_safe(sess, stmp, |
429 | &session_list_ptr->head, list) { | |
2f77fc4b | 430 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
431 | } |
432 | } | |
433 | ||
099e26bd | 434 | DBG("Closing all UST sockets"); |
56fff090 | 435 | ust_app_clean_list(); |
099e26bd | 436 | |
4fba7219 DG |
437 | if (is_root && !opt_no_kernel) { |
438 | DBG2("Closing kernel fd"); | |
a4b35e07 | 439 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
440 | ret = close(kernel_tracer_fd); |
441 | if (ret) { | |
442 | PERROR("close"); | |
443 | } | |
a4b35e07 | 444 | } |
2f50c8a3 | 445 | DBG("Unloading kernel modules"); |
096102bd | 446 | modprobe_remove_lttng_all(); |
2f50c8a3 | 447 | } |
2f77fc4b | 448 | |
421cb601 | 449 | /* <fun> */ |
f56a39af | 450 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
451 | "Matthew, BEET driven development works!%c[%dm", |
452 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
453 | /* </fun> */ | |
fac6795d DG |
454 | } |
455 | ||
e065084a | 456 | /* |
d063d709 | 457 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 458 | * |
d063d709 | 459 | * Return lttcomm error code. |
e065084a DG |
460 | */ |
461 | static int send_unix_sock(int sock, void *buf, size_t len) | |
462 | { | |
463 | /* Check valid length */ | |
c617c0c6 | 464 | if (len == 0) { |
e065084a DG |
465 | return -1; |
466 | } | |
467 | ||
468 | return lttcomm_send_unix_sock(sock, buf, len); | |
469 | } | |
470 | ||
5461b305 | 471 | /* |
d063d709 | 472 | * Free memory of a command context structure. |
5461b305 | 473 | */ |
a2fb29a5 | 474 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 475 | { |
a2fb29a5 DG |
476 | DBG("Clean command context structure"); |
477 | if (*cmd_ctx) { | |
478 | if ((*cmd_ctx)->llm) { | |
479 | free((*cmd_ctx)->llm); | |
5461b305 | 480 | } |
a2fb29a5 DG |
481 | if ((*cmd_ctx)->lsm) { |
482 | free((*cmd_ctx)->lsm); | |
5461b305 | 483 | } |
a2fb29a5 DG |
484 | free(*cmd_ctx); |
485 | *cmd_ctx = NULL; | |
5461b305 DG |
486 | } |
487 | } | |
488 | ||
fac6795d | 489 | /* |
0fdd1e2c | 490 | * Notify UST applications using the shm mmap futex. |
fac6795d | 491 | */ |
0fdd1e2c | 492 | static int notify_ust_apps(int active) |
fac6795d | 493 | { |
0fdd1e2c | 494 | char *wait_shm_mmap; |
fac6795d | 495 | |
0fdd1e2c | 496 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 497 | |
0fdd1e2c DG |
498 | /* See shm.c for this call implying mmap, shm and futex calls */ |
499 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
500 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
501 | goto error; |
502 | } | |
503 | ||
0fdd1e2c DG |
504 | /* Wake waiting process */ |
505 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
506 | ||
507 | /* Apps notified successfully */ | |
508 | return 0; | |
fac6795d DG |
509 | |
510 | error: | |
0fdd1e2c | 511 | return -1; |
fac6795d DG |
512 | } |
513 | ||
e065084a | 514 | /* |
d063d709 DG |
515 | * Setup the outgoing data buffer for the response (llm) by allocating the |
516 | * right amount of memory and copying the original information from the lsm | |
517 | * structure. | |
ca95a216 | 518 | * |
d063d709 | 519 | * Return total size of the buffer pointed by buf. |
ca95a216 | 520 | */ |
5461b305 | 521 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 522 | { |
f3ed775e | 523 | int ret, buf_size; |
ca95a216 | 524 | |
f3ed775e | 525 | buf_size = size; |
5461b305 | 526 | |
ba7f0ae5 | 527 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 528 | if (cmd_ctx->llm == NULL) { |
76d7553f | 529 | PERROR("zmalloc"); |
5461b305 | 530 | ret = -ENOMEM; |
ca95a216 DG |
531 | goto error; |
532 | } | |
533 | ||
5461b305 DG |
534 | /* Copy common data */ |
535 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 536 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 537 | |
5461b305 DG |
538 | cmd_ctx->llm->data_size = size; |
539 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
540 | ||
ca95a216 DG |
541 | return buf_size; |
542 | ||
543 | error: | |
544 | return ret; | |
545 | } | |
546 | ||
7a485870 | 547 | /* |
5eb91c98 | 548 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 549 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 550 | */ |
5eb91c98 | 551 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 552 | { |
5eb91c98 | 553 | int ret; |
7a485870 DG |
554 | struct ltt_session *session; |
555 | struct ltt_kernel_channel *channel; | |
556 | ||
5eb91c98 | 557 | DBG("Updating kernel poll set"); |
7a485870 | 558 | |
54d01ffb | 559 | session_lock_list(); |
b5541356 | 560 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 561 | session_lock(session); |
7a485870 | 562 | if (session->kernel_session == NULL) { |
54d01ffb | 563 | session_unlock(session); |
7a485870 DG |
564 | continue; |
565 | } | |
7a485870 | 566 | |
54d01ffb DG |
567 | cds_list_for_each_entry(channel, |
568 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
569 | /* Add channel fd to the kernel poll set */ |
570 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
571 | if (ret < 0) { | |
54d01ffb | 572 | session_unlock(session); |
5eb91c98 DG |
573 | goto error; |
574 | } | |
575 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 576 | } |
54d01ffb | 577 | session_unlock(session); |
7a485870 | 578 | } |
54d01ffb | 579 | session_unlock_list(); |
7a485870 | 580 | |
5eb91c98 | 581 | return 0; |
7a485870 DG |
582 | |
583 | error: | |
54d01ffb | 584 | session_unlock_list(); |
7a485870 DG |
585 | return -1; |
586 | } | |
587 | ||
588 | /* | |
54d01ffb | 589 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 590 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 591 | * |
d063d709 | 592 | * Useful for CPU hotplug feature. |
7a485870 | 593 | */ |
2bdd86d4 | 594 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
595 | { |
596 | int ret = 0; | |
597 | struct ltt_session *session; | |
173af62f | 598 | struct ltt_kernel_session *ksess; |
7a485870 DG |
599 | struct ltt_kernel_channel *channel; |
600 | ||
601 | DBG("Updating kernel streams for channel fd %d", fd); | |
602 | ||
54d01ffb | 603 | session_lock_list(); |
b5541356 | 604 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 605 | session_lock(session); |
7a485870 | 606 | if (session->kernel_session == NULL) { |
54d01ffb | 607 | session_unlock(session); |
7a485870 DG |
608 | continue; |
609 | } | |
173af62f | 610 | ksess = session->kernel_session; |
d9800920 | 611 | |
173af62f | 612 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
613 | if (channel->fd == fd) { |
614 | DBG("Channel found, updating kernel streams"); | |
615 | ret = kernel_open_channel_stream(channel); | |
616 | if (ret < 0) { | |
b3c750d2 | 617 | goto error; |
7a485870 | 618 | } |
d9800920 | 619 | |
7a485870 | 620 | /* |
5eb91c98 DG |
621 | * Have we already sent fds to the consumer? If yes, it means |
622 | * that tracing is started so it is safe to send our updated | |
623 | * stream fds. | |
7a485870 | 624 | */ |
173af62f DG |
625 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
626 | struct lttng_ht_iter iter; | |
627 | struct consumer_socket *socket; | |
628 | ||
629 | ||
630 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
631 | &iter.iter, socket, node.node) { | |
632 | /* Code flow error */ | |
633 | assert(socket->fd >= 0); | |
634 | ||
635 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 636 | ret = kernel_consumer_send_channel_stream(socket, |
173af62f DG |
637 | channel, ksess); |
638 | pthread_mutex_unlock(socket->lock); | |
639 | if (ret < 0) { | |
640 | goto error; | |
641 | } | |
7a485870 DG |
642 | } |
643 | } | |
b3c750d2 | 644 | goto error; |
7a485870 DG |
645 | } |
646 | } | |
54d01ffb | 647 | session_unlock(session); |
7a485870 | 648 | } |
54d01ffb | 649 | session_unlock_list(); |
b3c750d2 | 650 | return ret; |
7a485870 | 651 | |
b3c750d2 | 652 | error: |
54d01ffb DG |
653 | session_unlock(session); |
654 | session_unlock_list(); | |
7a485870 DG |
655 | return ret; |
656 | } | |
657 | ||
487cf67c DG |
658 | /* |
659 | * For each tracing session, update newly registered apps. | |
660 | */ | |
661 | static void update_ust_app(int app_sock) | |
662 | { | |
663 | struct ltt_session *sess, *stmp; | |
664 | ||
4ee14516 DG |
665 | session_lock_list(); |
666 | ||
487cf67c DG |
667 | /* For all tracing session(s) */ |
668 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 669 | session_lock(sess); |
421cb601 DG |
670 | if (sess->ust_session) { |
671 | ust_app_global_update(sess->ust_session, app_sock); | |
672 | } | |
4ee14516 | 673 | session_unlock(sess); |
487cf67c | 674 | } |
4ee14516 DG |
675 | |
676 | session_unlock_list(); | |
487cf67c DG |
677 | } |
678 | ||
7a485870 | 679 | /* |
d063d709 | 680 | * This thread manage event coming from the kernel. |
7a485870 | 681 | * |
d063d709 DG |
682 | * Features supported in this thread: |
683 | * -) CPU Hotplug | |
7a485870 DG |
684 | */ |
685 | static void *thread_manage_kernel(void *data) | |
686 | { | |
139ac872 | 687 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 688 | uint32_t revents, nb_fd; |
7a485870 | 689 | char tmp; |
5eb91c98 | 690 | struct lttng_poll_event events; |
7a485870 | 691 | |
6993eeb3 | 692 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 693 | |
d5d63bf1 DG |
694 | /* |
695 | * This first step of the while is to clean this structure which could free | |
696 | * non NULL pointers so zero it before the loop. | |
697 | */ | |
698 | memset(&events, 0, sizeof(events)); | |
699 | ||
6993eeb3 CB |
700 | if (testpoint(thread_manage_kernel)) { |
701 | goto error_testpoint; | |
702 | } | |
8ac94142 | 703 | |
44a5e5eb DG |
704 | health_code_update(&health_thread_kernel); |
705 | ||
6993eeb3 | 706 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 707 | goto error_testpoint; |
6993eeb3 CB |
708 | } |
709 | ||
7a485870 | 710 | while (1) { |
44a5e5eb DG |
711 | health_code_update(&health_thread_kernel); |
712 | ||
7a485870 | 713 | if (update_poll_flag == 1) { |
d21b0d71 DG |
714 | /* Clean events object. We are about to populate it again. */ |
715 | lttng_poll_clean(&events); | |
716 | ||
717 | ret = create_thread_poll_set(&events, 2); | |
718 | if (ret < 0) { | |
719 | goto error_poll_create; | |
720 | } | |
721 | ||
722 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
723 | if (ret < 0) { | |
724 | goto error; | |
725 | } | |
5f822d0a | 726 | |
d21b0d71 | 727 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
728 | ret = update_kernel_poll(&events); |
729 | if (ret < 0) { | |
7a485870 DG |
730 | goto error; |
731 | } | |
732 | update_poll_flag = 0; | |
733 | } | |
734 | ||
d21b0d71 | 735 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
736 | |
737 | /* Poll infinite value of time */ | |
88f2b785 | 738 | restart: |
44a5e5eb | 739 | health_poll_update(&health_thread_kernel); |
5eb91c98 | 740 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 741 | health_poll_update(&health_thread_kernel); |
7a485870 | 742 | if (ret < 0) { |
88f2b785 MD |
743 | /* |
744 | * Restart interrupted system call. | |
745 | */ | |
746 | if (errno == EINTR) { | |
747 | goto restart; | |
748 | } | |
7a485870 DG |
749 | goto error; |
750 | } else if (ret == 0) { | |
751 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
752 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
753 | "This should not have happened! Continuing..."); | |
7a485870 DG |
754 | continue; |
755 | } | |
756 | ||
0d9c5d77 DG |
757 | nb_fd = ret; |
758 | ||
5eb91c98 DG |
759 | for (i = 0; i < nb_fd; i++) { |
760 | /* Fetch once the poll data */ | |
761 | revents = LTTNG_POLL_GETEV(&events, i); | |
762 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 763 | |
44a5e5eb DG |
764 | health_code_update(&health_thread_kernel); |
765 | ||
5eb91c98 DG |
766 | /* Thread quit pipe has been closed. Killing thread. */ |
767 | ret = check_thread_quit_pipe(pollfd, revents); | |
768 | if (ret) { | |
139ac872 MD |
769 | err = 0; |
770 | goto exit; | |
5eb91c98 | 771 | } |
7a485870 | 772 | |
5eb91c98 DG |
773 | /* Check for data on kernel pipe */ |
774 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
775 | do { |
776 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
777 | } while (ret < 0 && errno == EINTR); | |
778 | /* | |
779 | * Ret value is useless here, if this pipe gets any actions an | |
780 | * update is required anyway. | |
781 | */ | |
5eb91c98 DG |
782 | update_poll_flag = 1; |
783 | continue; | |
784 | } else { | |
785 | /* | |
786 | * New CPU detected by the kernel. Adding kernel stream to | |
787 | * kernel session and updating the kernel consumer | |
788 | */ | |
789 | if (revents & LPOLLIN) { | |
2bdd86d4 | 790 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
791 | if (ret < 0) { |
792 | continue; | |
793 | } | |
794 | break; | |
795 | /* | |
796 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
797 | * and unregister kernel stream at this point. | |
798 | */ | |
7a485870 | 799 | } |
7a485870 DG |
800 | } |
801 | } | |
802 | } | |
803 | ||
139ac872 | 804 | exit: |
7a485870 | 805 | error: |
5eb91c98 | 806 | lttng_poll_clean(&events); |
76d7553f | 807 | error_poll_create: |
6993eeb3 | 808 | error_testpoint: |
6620da75 DG |
809 | utils_close_pipe(kernel_poll_pipe); |
810 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 MD |
811 | if (err) { |
812 | health_error(&health_thread_kernel); | |
813 | ERR("Health error occurred in %s", __func__); | |
6620da75 DG |
814 | WARN("Kernel thread died unexpectedly. " |
815 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 MD |
816 | } |
817 | health_exit(&health_thread_kernel); | |
76d7553f | 818 | DBG("Kernel thread dying"); |
7a485870 DG |
819 | return NULL; |
820 | } | |
821 | ||
a23ec3a7 DG |
822 | /* |
823 | * Signal pthread condition of the consumer data that the thread. | |
824 | */ | |
825 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
826 | { | |
827 | pthread_mutex_lock(&data->cond_mutex); | |
828 | ||
829 | /* | |
830 | * The state is set before signaling. It can be any value, it's the waiter | |
831 | * job to correctly interpret this condition variable associated to the | |
832 | * consumer pthread_cond. | |
833 | * | |
834 | * A value of 0 means that the corresponding thread of the consumer data | |
835 | * was not started. 1 indicates that the thread has started and is ready | |
836 | * for action. A negative value means that there was an error during the | |
837 | * thread bootstrap. | |
838 | */ | |
839 | data->consumer_thread_is_ready = state; | |
840 | (void) pthread_cond_signal(&data->cond); | |
841 | ||
842 | pthread_mutex_unlock(&data->cond_mutex); | |
843 | } | |
844 | ||
1d4b027a | 845 | /* |
3bd1e081 | 846 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 847 | */ |
3bd1e081 | 848 | static void *thread_manage_consumer(void *data) |
1d4b027a | 849 | { |
139ac872 | 850 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 851 | uint32_t revents, nb_fd; |
1d4b027a | 852 | enum lttcomm_return_code code; |
5eb91c98 | 853 | struct lttng_poll_event events; |
3bd1e081 | 854 | struct consumer_data *consumer_data = data; |
1d4b027a | 855 | |
3bd1e081 | 856 | DBG("[thread] Manage consumer started"); |
1d4b027a | 857 | |
9449cc75 DG |
858 | /* |
859 | * Since the consumer thread can be spawned at any moment in time, we init | |
860 | * the health to a poll status (1, which is a valid health over time). | |
861 | * When the thread starts, we update here the health to a "code" path being | |
862 | * an even value so this thread, when reaching a poll wait, does not | |
863 | * trigger an error with an even value. | |
864 | * | |
865 | * Here is the use case we avoid. | |
866 | * | |
867 | * +1: the first poll update during initialization (main()) | |
868 | * +2 * x: multiple code update once in this thread. | |
869 | * +1: poll wait in this thread (being a good health state). | |
870 | * == even number which after the wait period shows as a bad health. | |
871 | * | |
872 | * In a nutshell, the following poll update to the health state brings back | |
873 | * the state to an even value meaning a code path. | |
874 | */ | |
875 | health_poll_update(&consumer_data->health); | |
876 | ||
5eb91c98 DG |
877 | /* |
878 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
879 | * Nothing more will be added to this poll set. | |
880 | */ | |
881 | ret = create_thread_poll_set(&events, 2); | |
882 | if (ret < 0) { | |
76d7553f | 883 | goto error_poll; |
5eb91c98 | 884 | } |
273ea72c | 885 | |
edb8b045 DG |
886 | /* |
887 | * The error socket here is already in a listening state which was done | |
888 | * just before spawning this thread to avoid a race between the consumer | |
889 | * daemon exec trying to connect and the listen() call. | |
890 | */ | |
3bd1e081 | 891 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
892 | if (ret < 0) { |
893 | goto error; | |
894 | } | |
895 | ||
44a5e5eb DG |
896 | health_code_update(&consumer_data->health); |
897 | ||
273ea72c | 898 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 899 | restart: |
44a5e5eb | 900 | health_poll_update(&consumer_data->health); |
8ac94142 | 901 | |
6993eeb3 CB |
902 | if (testpoint(thread_manage_consumer)) { |
903 | goto error; | |
904 | } | |
8ac94142 | 905 | |
5eb91c98 | 906 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 907 | health_poll_update(&consumer_data->health); |
273ea72c | 908 | if (ret < 0) { |
88f2b785 MD |
909 | /* |
910 | * Restart interrupted system call. | |
911 | */ | |
912 | if (errno == EINTR) { | |
913 | goto restart; | |
914 | } | |
273ea72c DG |
915 | goto error; |
916 | } | |
917 | ||
0d9c5d77 DG |
918 | nb_fd = ret; |
919 | ||
5eb91c98 DG |
920 | for (i = 0; i < nb_fd; i++) { |
921 | /* Fetch once the poll data */ | |
922 | revents = LTTNG_POLL_GETEV(&events, i); | |
923 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
924 | ||
44a5e5eb DG |
925 | health_code_update(&consumer_data->health); |
926 | ||
5eb91c98 DG |
927 | /* Thread quit pipe has been closed. Killing thread. */ |
928 | ret = check_thread_quit_pipe(pollfd, revents); | |
929 | if (ret) { | |
139ac872 MD |
930 | err = 0; |
931 | goto exit; | |
5eb91c98 DG |
932 | } |
933 | ||
934 | /* Event on the registration socket */ | |
3bd1e081 | 935 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 936 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 937 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
938 | goto error; |
939 | } | |
940 | } | |
273ea72c DG |
941 | } |
942 | ||
3bd1e081 | 943 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
944 | if (sock < 0) { |
945 | goto error; | |
946 | } | |
947 | ||
b662582b DG |
948 | /* |
949 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
950 | * show must go on. | |
951 | */ | |
952 | (void) utils_set_fd_cloexec(sock); | |
953 | ||
44a5e5eb DG |
954 | health_code_update(&consumer_data->health); |
955 | ||
3bd1e081 | 956 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 957 | |
712ea556 | 958 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
959 | ret = lttcomm_recv_unix_sock(sock, &code, |
960 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
961 | if (ret <= 0) { |
962 | goto error; | |
963 | } | |
964 | ||
44a5e5eb DG |
965 | health_code_update(&consumer_data->health); |
966 | ||
f73fabfd | 967 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 MD |
968 | consumer_data->cmd_sock = |
969 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
970 | if (consumer_data->cmd_sock < 0) { | |
a23ec3a7 DG |
971 | /* On error, signal condition and quit. */ |
972 | signal_consumer_condition(consumer_data, -1); | |
48842b30 | 973 | PERROR("consumer connect"); |
1d4b027a DG |
974 | goto error; |
975 | } | |
a23ec3a7 DG |
976 | signal_consumer_condition(consumer_data, 1); |
977 | DBG("Consumer command socket ready"); | |
1d4b027a | 978 | } else { |
3bd1e081 | 979 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
980 | lttcomm_get_readable_code(-code)); |
981 | goto error; | |
982 | } | |
983 | ||
54d01ffb | 984 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 985 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 986 | if (ret < 0) { |
72079cae DG |
987 | goto error; |
988 | } | |
989 | ||
5eb91c98 DG |
990 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
991 | if (ret < 0) { | |
72079cae | 992 | goto error; |
5eb91c98 DG |
993 | } |
994 | ||
44a5e5eb DG |
995 | health_code_update(&consumer_data->health); |
996 | ||
5eb91c98 | 997 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 998 | restart_poll: |
44a5e5eb | 999 | health_poll_update(&consumer_data->health); |
5eb91c98 | 1000 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 1001 | health_poll_update(&consumer_data->health); |
5eb91c98 | 1002 | if (ret < 0) { |
88f2b785 MD |
1003 | /* |
1004 | * Restart interrupted system call. | |
1005 | */ | |
1006 | if (errno == EINTR) { | |
1007 | goto restart_poll; | |
1008 | } | |
72079cae DG |
1009 | goto error; |
1010 | } | |
1011 | ||
0d9c5d77 DG |
1012 | nb_fd = ret; |
1013 | ||
5eb91c98 DG |
1014 | for (i = 0; i < nb_fd; i++) { |
1015 | /* Fetch once the poll data */ | |
1016 | revents = LTTNG_POLL_GETEV(&events, i); | |
1017 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1018 | ||
44a5e5eb DG |
1019 | health_code_update(&consumer_data->health); |
1020 | ||
5eb91c98 DG |
1021 | /* Thread quit pipe has been closed. Killing thread. */ |
1022 | ret = check_thread_quit_pipe(pollfd, revents); | |
1023 | if (ret) { | |
139ac872 MD |
1024 | err = 0; |
1025 | goto exit; | |
5eb91c98 DG |
1026 | } |
1027 | ||
1028 | /* Event on the kconsumerd socket */ | |
1029 | if (pollfd == sock) { | |
1030 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1031 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1032 | goto error; |
1033 | } | |
1034 | } | |
1035 | } | |
1036 | ||
44a5e5eb DG |
1037 | health_code_update(&consumer_data->health); |
1038 | ||
712ea556 | 1039 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1040 | ret = lttcomm_recv_unix_sock(sock, &code, |
1041 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1042 | if (ret <= 0) { |
3bd1e081 | 1043 | ERR("consumer closed the command socket"); |
712ea556 | 1044 | goto error; |
6f61d021 | 1045 | } |
1d4b027a | 1046 | |
3bd1e081 | 1047 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1048 | |
139ac872 | 1049 | exit: |
1d4b027a | 1050 | error: |
5c827ce0 DG |
1051 | /* Immediately set the consumerd state to stopped */ |
1052 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1053 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1054 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1055 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1056 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1057 | } else { | |
1058 | /* Code flow error... */ | |
1059 | assert(0); | |
1060 | } | |
1061 | ||
76d7553f MD |
1062 | if (consumer_data->err_sock >= 0) { |
1063 | ret = close(consumer_data->err_sock); | |
1064 | if (ret) { | |
1065 | PERROR("close"); | |
1066 | } | |
1067 | } | |
1068 | if (consumer_data->cmd_sock >= 0) { | |
1069 | ret = close(consumer_data->cmd_sock); | |
1070 | if (ret) { | |
1071 | PERROR("close"); | |
1072 | } | |
1073 | } | |
1074 | if (sock >= 0) { | |
1075 | ret = close(sock); | |
1076 | if (ret) { | |
1077 | PERROR("close"); | |
1078 | } | |
1079 | } | |
273ea72c | 1080 | |
3bd1e081 MD |
1081 | unlink(consumer_data->err_unix_sock_path); |
1082 | unlink(consumer_data->cmd_unix_sock_path); | |
1083 | consumer_data->pid = 0; | |
1d4b027a | 1084 | |
5eb91c98 | 1085 | lttng_poll_clean(&events); |
76d7553f | 1086 | error_poll: |
139ac872 MD |
1087 | if (err) { |
1088 | health_error(&consumer_data->health); | |
1089 | ERR("Health error occurred in %s", __func__); | |
1090 | } | |
1091 | health_exit(&consumer_data->health); | |
76d7553f | 1092 | DBG("consumer thread cleanup completed"); |
0177d773 | 1093 | |
5eb91c98 | 1094 | return NULL; |
099e26bd DG |
1095 | } |
1096 | ||
099e26bd DG |
1097 | /* |
1098 | * This thread manage application communication. | |
1d4b027a DG |
1099 | */ |
1100 | static void *thread_manage_apps(void *data) | |
099e26bd | 1101 | { |
139ac872 | 1102 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1103 | uint32_t revents, nb_fd; |
099e26bd | 1104 | struct ust_command ust_cmd; |
5eb91c98 | 1105 | struct lttng_poll_event events; |
099e26bd DG |
1106 | |
1107 | DBG("[thread] Manage application started"); | |
1108 | ||
f6a9efaa DG |
1109 | rcu_register_thread(); |
1110 | rcu_thread_online(); | |
1111 | ||
6993eeb3 CB |
1112 | if (testpoint(thread_manage_apps)) { |
1113 | goto error_testpoint; | |
1114 | } | |
1115 | ||
139ac872 | 1116 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1117 | |
5eb91c98 DG |
1118 | ret = create_thread_poll_set(&events, 2); |
1119 | if (ret < 0) { | |
76d7553f | 1120 | goto error_poll_create; |
5eb91c98 | 1121 | } |
099e26bd | 1122 | |
5eb91c98 DG |
1123 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1124 | if (ret < 0) { | |
1125 | goto error; | |
1126 | } | |
099e26bd | 1127 | |
6993eeb3 CB |
1128 | if (testpoint(thread_manage_apps_before_loop)) { |
1129 | goto error; | |
1130 | } | |
8ac94142 | 1131 | |
139ac872 | 1132 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1133 | |
5eb91c98 | 1134 | while (1) { |
d21b0d71 | 1135 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1136 | |
1137 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1138 | restart: |
139ac872 | 1139 | health_poll_update(&health_thread_app_manage); |
5eb91c98 | 1140 | ret = lttng_poll_wait(&events, -1); |
139ac872 | 1141 | health_poll_update(&health_thread_app_manage); |
099e26bd | 1142 | if (ret < 0) { |
88f2b785 MD |
1143 | /* |
1144 | * Restart interrupted system call. | |
1145 | */ | |
1146 | if (errno == EINTR) { | |
1147 | goto restart; | |
1148 | } | |
099e26bd DG |
1149 | goto error; |
1150 | } | |
1151 | ||
0d9c5d77 DG |
1152 | nb_fd = ret; |
1153 | ||
5eb91c98 DG |
1154 | for (i = 0; i < nb_fd; i++) { |
1155 | /* Fetch once the poll data */ | |
1156 | revents = LTTNG_POLL_GETEV(&events, i); | |
1157 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1158 | ||
139ac872 | 1159 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1160 | |
5eb91c98 DG |
1161 | /* Thread quit pipe has been closed. Killing thread. */ |
1162 | ret = check_thread_quit_pipe(pollfd, revents); | |
1163 | if (ret) { | |
139ac872 MD |
1164 | err = 0; |
1165 | goto exit; | |
5eb91c98 | 1166 | } |
099e26bd | 1167 | |
5eb91c98 DG |
1168 | /* Inspect the apps cmd pipe */ |
1169 | if (pollfd == apps_cmd_pipe[0]) { | |
1170 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1171 | ERR("Apps command pipe error"); | |
0177d773 | 1172 | goto error; |
5eb91c98 DG |
1173 | } else if (revents & LPOLLIN) { |
1174 | /* Empty pipe */ | |
f921c78f DG |
1175 | do { |
1176 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1177 | } while (ret < 0 && errno == EINTR); | |
5eb91c98 | 1178 | if (ret < 0 || ret < sizeof(ust_cmd)) { |
76d7553f | 1179 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1180 | goto error; |
1181 | } | |
099e26bd | 1182 | |
139ac872 | 1183 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1184 | |
5eb91c98 | 1185 | /* Register applicaton to the session daemon */ |
56fff090 | 1186 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1187 | ust_cmd.sock); |
88ff5b7f | 1188 | if (ret == -ENOMEM) { |
5eb91c98 | 1189 | goto error; |
88ff5b7f MD |
1190 | } else if (ret < 0) { |
1191 | break; | |
5eb91c98 DG |
1192 | } |
1193 | ||
139ac872 | 1194 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1195 | |
acc7b41b | 1196 | /* |
e0c7ec2b | 1197 | * Validate UST version compatibility. |
acc7b41b | 1198 | */ |
e0c7ec2b DG |
1199 | ret = ust_app_validate_version(ust_cmd.sock); |
1200 | if (ret >= 0) { | |
1201 | /* | |
1202 | * Add channel(s) and event(s) to newly registered apps | |
1203 | * from lttng global UST domain. | |
1204 | */ | |
1205 | update_ust_app(ust_cmd.sock); | |
1206 | } | |
acc7b41b | 1207 | |
139ac872 | 1208 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1209 | |
f2ca2e25 | 1210 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1211 | if (ret < 0) { |
1212 | /* | |
1213 | * If the registration is not possible, we simply | |
1214 | * unregister the apps and continue | |
1215 | */ | |
56fff090 | 1216 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1217 | } else { |
1218 | /* | |
622c9ecf DG |
1219 | * We only monitor the error events of the socket. This |
1220 | * thread does not handle any incoming data from UST | |
1221 | * (POLLIN). | |
5eb91c98 | 1222 | */ |
622c9ecf DG |
1223 | ret = lttng_poll_add(&events, ust_cmd.sock, |
1224 | LPOLLERR & LPOLLHUP & LPOLLRDHUP); | |
5eb91c98 DG |
1225 | if (ret < 0) { |
1226 | goto error; | |
1227 | } | |
1228 | ||
ae9e45b3 DG |
1229 | /* Set socket timeout for both receiving and ending */ |
1230 | (void) lttcomm_setsockopt_rcv_timeout(ust_cmd.sock, | |
1231 | app_socket_timeout); | |
1232 | (void) lttcomm_setsockopt_snd_timeout(ust_cmd.sock, | |
1233 | app_socket_timeout); | |
1234 | ||
54d01ffb DG |
1235 | DBG("Apps with sock %d added to poll set", |
1236 | ust_cmd.sock); | |
5eb91c98 | 1237 | } |
487cf67c | 1238 | |
139ac872 | 1239 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1240 | |
5eb91c98 | 1241 | break; |
0177d773 | 1242 | } |
5eb91c98 DG |
1243 | } else { |
1244 | /* | |
54d01ffb DG |
1245 | * At this point, we know that a registered application made |
1246 | * the event at poll_wait. | |
5eb91c98 DG |
1247 | */ |
1248 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1249 | /* Removing from the poll set */ | |
1250 | ret = lttng_poll_del(&events, pollfd); | |
1251 | if (ret < 0) { | |
1252 | goto error; | |
1253 | } | |
099e26bd | 1254 | |
b9d9b220 | 1255 | /* Socket closed on remote end. */ |
56fff090 | 1256 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1257 | break; |
1258 | } | |
099e26bd | 1259 | } |
44a5e5eb | 1260 | |
139ac872 | 1261 | health_code_update(&health_thread_app_manage); |
099e26bd | 1262 | } |
099e26bd DG |
1263 | } |
1264 | ||
139ac872 | 1265 | exit: |
099e26bd | 1266 | error: |
5eb91c98 | 1267 | lttng_poll_clean(&events); |
76d7553f | 1268 | error_poll_create: |
6993eeb3 | 1269 | error_testpoint: |
6620da75 DG |
1270 | utils_close_pipe(apps_cmd_pipe); |
1271 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1272 | ||
1273 | /* | |
1274 | * We don't clean the UST app hash table here since already registered | |
1275 | * applications can still be controlled so let them be until the session | |
1276 | * daemon dies or the applications stop. | |
1277 | */ | |
1278 | ||
139ac872 MD |
1279 | if (err) { |
1280 | health_error(&health_thread_app_manage); | |
1281 | ERR("Health error occurred in %s", __func__); | |
1282 | } | |
1283 | health_exit(&health_thread_app_manage); | |
76d7553f | 1284 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1285 | rcu_thread_offline(); |
1286 | rcu_unregister_thread(); | |
099e26bd DG |
1287 | return NULL; |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Dispatch request from the registration threads to the application | |
1292 | * communication thread. | |
1293 | */ | |
1294 | static void *thread_dispatch_ust_registration(void *data) | |
1295 | { | |
1296 | int ret; | |
1297 | struct cds_wfq_node *node; | |
1298 | struct ust_command *ust_cmd = NULL; | |
1299 | ||
1300 | DBG("[thread] Dispatch UST command started"); | |
1301 | ||
26c9d55e | 1302 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
099e26bd DG |
1303 | /* Atomically prepare the queue futex */ |
1304 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1305 | ||
1306 | do { | |
1307 | /* Dequeue command for registration */ | |
1308 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1309 | if (node == NULL) { | |
00a17c97 | 1310 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1311 | /* Continue thread execution */ |
1312 | break; | |
1313 | } | |
1314 | ||
1315 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1316 | ||
2f50c8a3 DG |
1317 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1318 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1319 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1320 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1321 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1322 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1323 | /* |
1324 | * Inform apps thread of the new application registration. This | |
1325 | * call is blocking so we can be assured that the data will be read | |
1326 | * at some point in time or wait to the end of the world :) | |
1327 | */ | |
6620da75 DG |
1328 | if (apps_cmd_pipe[1] >= 0) { |
1329 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1330 | sizeof(struct ust_command)); | |
1331 | if (ret < 0) { | |
1332 | PERROR("write apps cmd pipe"); | |
1333 | if (errno == EBADF) { | |
1334 | /* | |
1335 | * We can't inform the application thread to process | |
1336 | * registration. We will exit or else application | |
1337 | * registration will not occur and tracing will never | |
1338 | * start. | |
1339 | */ | |
1340 | goto error; | |
1341 | } | |
1342 | } | |
1343 | } else { | |
1344 | /* Application manager thread is not available. */ | |
1345 | ret = close(ust_cmd->sock); | |
1346 | if (ret < 0) { | |
1347 | PERROR("close ust_cmd sock"); | |
099e26bd DG |
1348 | } |
1349 | } | |
1350 | free(ust_cmd); | |
1351 | } while (node != NULL); | |
1352 | ||
1353 | /* Futex wait on queue. Blocking call on futex() */ | |
1354 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1355 | } | |
1356 | ||
1357 | error: | |
1358 | DBG("Dispatch thread dying"); | |
1359 | return NULL; | |
1360 | } | |
1361 | ||
1362 | /* | |
1363 | * This thread manage application registration. | |
1364 | */ | |
1365 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1366 | { |
139ac872 | 1367 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1368 | uint32_t revents, nb_fd; |
1369 | struct lttng_poll_event events; | |
099e26bd DG |
1370 | /* |
1371 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1372 | * freed in the manage apps thread. | |
1373 | */ | |
1374 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1375 | |
099e26bd | 1376 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1377 | |
6993eeb3 CB |
1378 | if (testpoint(thread_registration_apps)) { |
1379 | goto error_testpoint; | |
1380 | } | |
8ac94142 | 1381 | |
1d4b027a DG |
1382 | ret = lttcomm_listen_unix_sock(apps_sock); |
1383 | if (ret < 0) { | |
76d7553f | 1384 | goto error_listen; |
1d4b027a DG |
1385 | } |
1386 | ||
5eb91c98 DG |
1387 | /* |
1388 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1389 | * more will be added to this poll set. | |
1390 | */ | |
1391 | ret = create_thread_poll_set(&events, 2); | |
1392 | if (ret < 0) { | |
76d7553f | 1393 | goto error_create_poll; |
5eb91c98 | 1394 | } |
273ea72c | 1395 | |
5eb91c98 DG |
1396 | /* Add the application registration socket */ |
1397 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1398 | if (ret < 0) { | |
76d7553f | 1399 | goto error_poll_add; |
5eb91c98 | 1400 | } |
273ea72c | 1401 | |
1d4b027a | 1402 | /* Notify all applications to register */ |
0fdd1e2c DG |
1403 | ret = notify_ust_apps(1); |
1404 | if (ret < 0) { | |
1405 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1406 | "Execution continues but there might be problem for already\n" |
1407 | "running applications that wishes to register."); | |
0fdd1e2c | 1408 | } |
1d4b027a DG |
1409 | |
1410 | while (1) { | |
1411 | DBG("Accepting application registration"); | |
273ea72c DG |
1412 | |
1413 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1414 | restart: |
139ac872 | 1415 | health_poll_update(&health_thread_app_reg); |
5eb91c98 | 1416 | ret = lttng_poll_wait(&events, -1); |
139ac872 | 1417 | health_poll_update(&health_thread_app_reg); |
273ea72c | 1418 | if (ret < 0) { |
88f2b785 MD |
1419 | /* |
1420 | * Restart interrupted system call. | |
1421 | */ | |
1422 | if (errno == EINTR) { | |
1423 | goto restart; | |
1424 | } | |
273ea72c DG |
1425 | goto error; |
1426 | } | |
1427 | ||
0d9c5d77 DG |
1428 | nb_fd = ret; |
1429 | ||
5eb91c98 | 1430 | for (i = 0; i < nb_fd; i++) { |
139ac872 MD |
1431 | health_code_update(&health_thread_app_reg); |
1432 | ||
5eb91c98 DG |
1433 | /* Fetch once the poll data */ |
1434 | revents = LTTNG_POLL_GETEV(&events, i); | |
1435 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1436 | |
5eb91c98 DG |
1437 | /* Thread quit pipe has been closed. Killing thread. */ |
1438 | ret = check_thread_quit_pipe(pollfd, revents); | |
1439 | if (ret) { | |
139ac872 MD |
1440 | err = 0; |
1441 | goto exit; | |
90014c57 | 1442 | } |
1d4b027a | 1443 | |
5eb91c98 DG |
1444 | /* Event on the registration socket */ |
1445 | if (pollfd == apps_sock) { | |
1446 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1447 | ERR("Register apps socket poll error"); | |
1448 | goto error; | |
1449 | } else if (revents & LPOLLIN) { | |
1450 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1451 | if (sock < 0) { | |
1452 | goto error; | |
1453 | } | |
099e26bd | 1454 | |
b662582b DG |
1455 | /* |
1456 | * Set the CLOEXEC flag. Return code is useless because | |
1457 | * either way, the show must go on. | |
1458 | */ | |
1459 | (void) utils_set_fd_cloexec(sock); | |
1460 | ||
5eb91c98 | 1461 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1462 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1463 | if (ust_cmd == NULL) { |
76d7553f | 1464 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1465 | goto error; |
1466 | } | |
1d4b027a | 1467 | |
5eb91c98 DG |
1468 | /* |
1469 | * Using message-based transmissions to ensure we don't | |
1470 | * have to deal with partially received messages. | |
1471 | */ | |
4063050c MD |
1472 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1473 | if (ret < 0) { | |
1474 | ERR("Exhausted file descriptors allowed for applications."); | |
1475 | free(ust_cmd); | |
1476 | ret = close(sock); | |
1477 | if (ret) { | |
1478 | PERROR("close"); | |
1479 | } | |
1480 | sock = -1; | |
1481 | continue; | |
1482 | } | |
139ac872 | 1483 | health_code_update(&health_thread_app_reg); |
5eb91c98 DG |
1484 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1485 | sizeof(struct ust_register_msg)); | |
1486 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1487 | if (ret < 0) { | |
76d7553f | 1488 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1489 | } else { |
1490 | ERR("Wrong size received on apps register"); | |
1491 | } | |
1492 | free(ust_cmd); | |
76d7553f MD |
1493 | ret = close(sock); |
1494 | if (ret) { | |
1495 | PERROR("close"); | |
1496 | } | |
4063050c | 1497 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1498 | sock = -1; |
5eb91c98 DG |
1499 | continue; |
1500 | } | |
139ac872 | 1501 | health_code_update(&health_thread_app_reg); |
099e26bd | 1502 | |
5eb91c98 | 1503 | ust_cmd->sock = sock; |
34a2494f | 1504 | sock = -1; |
099e26bd | 1505 | |
5eb91c98 DG |
1506 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1507 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1508 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1509 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1510 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1511 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1512 | |
5eb91c98 DG |
1513 | /* |
1514 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1515 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1516 | */ |
1517 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1518 | ||
1519 | /* | |
1520 | * Wake the registration queue futex. Implicit memory | |
1521 | * barrier with the exchange in cds_wfq_enqueue. | |
1522 | */ | |
1523 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1524 | } | |
1525 | } | |
90014c57 | 1526 | } |
1d4b027a DG |
1527 | } |
1528 | ||
139ac872 | 1529 | exit: |
1d4b027a | 1530 | error: |
139ac872 MD |
1531 | if (err) { |
1532 | health_error(&health_thread_app_reg); | |
1533 | ERR("Health error occurred in %s", __func__); | |
1534 | } | |
139ac872 | 1535 | |
0fdd1e2c DG |
1536 | /* Notify that the registration thread is gone */ |
1537 | notify_ust_apps(0); | |
1538 | ||
a4b35e07 | 1539 | if (apps_sock >= 0) { |
76d7553f MD |
1540 | ret = close(apps_sock); |
1541 | if (ret) { | |
1542 | PERROR("close"); | |
1543 | } | |
a4b35e07 | 1544 | } |
46c3f085 | 1545 | if (sock >= 0) { |
76d7553f MD |
1546 | ret = close(sock); |
1547 | if (ret) { | |
1548 | PERROR("close"); | |
1549 | } | |
4063050c | 1550 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1551 | } |
273ea72c | 1552 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1553 | |
76d7553f | 1554 | error_poll_add: |
5eb91c98 | 1555 | lttng_poll_clean(&events); |
76d7553f MD |
1556 | error_listen: |
1557 | error_create_poll: | |
6993eeb3 | 1558 | error_testpoint: |
76d7553f | 1559 | DBG("UST Registration thread cleanup complete"); |
152413a0 | 1560 | health_exit(&health_thread_app_reg); |
5eb91c98 | 1561 | |
1d4b027a DG |
1562 | return NULL; |
1563 | } | |
1564 | ||
8c0faa1d | 1565 | /* |
3bd1e081 | 1566 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1567 | * exec or it will fails. |
8c0faa1d | 1568 | */ |
3bd1e081 | 1569 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1570 | { |
a23ec3a7 | 1571 | int ret, clock_ret; |
ee0b0061 DG |
1572 | struct timespec timeout; |
1573 | ||
a23ec3a7 DG |
1574 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1575 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1576 | |
a23ec3a7 DG |
1577 | /* Setup pthread condition */ |
1578 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1579 | if (ret != 0) { | |
1580 | errno = ret; | |
1581 | PERROR("pthread_condattr_init consumer data"); | |
1582 | goto error; | |
1583 | } | |
1584 | ||
1585 | /* | |
1586 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1587 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1588 | * for a more details and how we noticed it. | |
1589 | */ | |
1590 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1591 | if (ret != 0) { | |
1592 | errno = ret; | |
1593 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1594 | goto error; |
1595 | } | |
8c0faa1d | 1596 | |
a23ec3a7 DG |
1597 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1598 | if (ret != 0) { | |
1599 | errno = ret; | |
1600 | PERROR("pthread_cond_init consumer data"); | |
1601 | goto error; | |
1602 | } | |
1603 | ||
1604 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1605 | consumer_data); | |
8c0faa1d | 1606 | if (ret != 0) { |
3bd1e081 | 1607 | PERROR("pthread_create consumer"); |
ee0b0061 | 1608 | ret = -1; |
8c0faa1d DG |
1609 | goto error; |
1610 | } | |
1611 | ||
a23ec3a7 DG |
1612 | /* We are about to wait on a pthread condition */ |
1613 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1614 | ||
ee0b0061 | 1615 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1616 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1617 | /* | |
1618 | * Set the timeout for the condition timed wait even if the clock gettime | |
1619 | * call fails since we might loop on that call and we want to avoid to | |
1620 | * increment the timeout too many times. | |
1621 | */ | |
1622 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1623 | ||
1624 | /* | |
1625 | * The following loop COULD be skipped in some conditions so this is why we | |
1626 | * set ret to 0 in order to make sure at least one round of the loop is | |
1627 | * done. | |
1628 | */ | |
1629 | ret = 0; | |
1630 | ||
1631 | /* | |
1632 | * Loop until the condition is reached or when a timeout is reached. Note | |
1633 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1634 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1635 | * possible. This loop does not take any chances and works with both of | |
1636 | * them. | |
1637 | */ | |
1638 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1639 | if (clock_ret < 0) { | |
1640 | PERROR("clock_gettime spawn consumer"); | |
1641 | /* Infinite wait for the consumerd thread to be ready */ | |
1642 | ret = pthread_cond_wait(&consumer_data->cond, | |
1643 | &consumer_data->cond_mutex); | |
1644 | } else { | |
1645 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1646 | &consumer_data->cond_mutex, &timeout); | |
1647 | } | |
ee0b0061 | 1648 | } |
8c0faa1d | 1649 | |
a23ec3a7 DG |
1650 | /* Release the pthread condition */ |
1651 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1652 | ||
1653 | if (ret != 0) { | |
1654 | errno = ret; | |
1655 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1656 | /* |
1657 | * Call has timed out so we kill the kconsumerd_thread and return | |
1658 | * an error. | |
1659 | */ | |
a23ec3a7 DG |
1660 | ERR("Condition timed out. The consumer thread was never ready." |
1661 | " Killing it"); | |
3bd1e081 | 1662 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1663 | if (ret < 0) { |
3bd1e081 | 1664 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1665 | } |
1666 | } else { | |
a23ec3a7 | 1667 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1668 | } |
1669 | goto error; | |
1670 | } | |
1671 | ||
3bd1e081 MD |
1672 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1673 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 1674 | ERR("Consumerd did not start"); |
3bd1e081 | 1675 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1676 | goto error; |
1677 | } | |
3bd1e081 | 1678 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1679 | |
8c0faa1d DG |
1680 | return 0; |
1681 | ||
1682 | error: | |
1683 | return ret; | |
1684 | } | |
1685 | ||
d9800920 | 1686 | /* |
3bd1e081 | 1687 | * Join consumer thread |
d9800920 | 1688 | */ |
3bd1e081 | 1689 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1690 | { |
1691 | void *status; | |
cf3af59e | 1692 | |
e8209f6b DG |
1693 | /* Consumer pid must be a real one. */ |
1694 | if (consumer_data->pid > 0) { | |
c617c0c6 | 1695 | int ret; |
3bd1e081 | 1696 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 1697 | if (ret) { |
3bd1e081 | 1698 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1699 | return ret; |
1700 | } | |
3bd1e081 | 1701 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1702 | } else { |
1703 | return 0; | |
1704 | } | |
1705 | } | |
1706 | ||
8c0faa1d | 1707 | /* |
3bd1e081 | 1708 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1709 | * |
d063d709 | 1710 | * Return pid if successful else -1. |
8c0faa1d | 1711 | */ |
3bd1e081 | 1712 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1713 | { |
1714 | int ret; | |
1715 | pid_t pid; | |
94c55f17 | 1716 | const char *consumer_to_use; |
53086306 | 1717 | const char *verbosity; |
94c55f17 | 1718 | struct stat st; |
8c0faa1d | 1719 | |
3bd1e081 | 1720 | DBG("Spawning consumerd"); |
c49dc785 | 1721 | |
8c0faa1d DG |
1722 | pid = fork(); |
1723 | if (pid == 0) { | |
1724 | /* | |
3bd1e081 | 1725 | * Exec consumerd. |
8c0faa1d | 1726 | */ |
daee5345 | 1727 | if (opt_verbose_consumer) { |
53086306 DG |
1728 | verbosity = "--verbose"; |
1729 | } else { | |
1730 | verbosity = "--quiet"; | |
1731 | } | |
3bd1e081 MD |
1732 | switch (consumer_data->type) { |
1733 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1734 | /* |
c7704d57 DG |
1735 | * Find out which consumerd to execute. We will first try the |
1736 | * 64-bit path, then the sessiond's installation directory, and | |
1737 | * fallback on the 32-bit one, | |
94c55f17 | 1738 | */ |
63a799e8 AM |
1739 | DBG3("Looking for a kernel consumer at these locations:"); |
1740 | DBG3(" 1) %s", consumerd64_bin); | |
1741 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1742 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1743 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1744 | DBG3("Found location #1"); |
94c55f17 | 1745 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1746 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1747 | DBG3("Found location #2"); |
94c55f17 | 1748 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1749 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1750 | DBG3("Found location #3"); |
eb1e0bd4 | 1751 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1752 | } else { |
63a799e8 | 1753 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1754 | break; |
1755 | } | |
1756 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1757 | execl(consumer_to_use, | |
1758 | "lttng-consumerd", verbosity, "-k", | |
1759 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1760 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1761 | NULL); | |
3bd1e081 | 1762 | break; |
7753dea8 MD |
1763 | case LTTNG_CONSUMER64_UST: |
1764 | { | |
b1e0b6b6 | 1765 | char *tmpnew = NULL; |
8f4905da MD |
1766 | |
1767 | if (consumerd64_libdir[0] != '\0') { | |
1768 | char *tmp; | |
1769 | size_t tmplen; | |
1770 | ||
1771 | tmp = getenv("LD_LIBRARY_PATH"); | |
1772 | if (!tmp) { | |
1773 | tmp = ""; | |
1774 | } | |
1775 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1776 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1777 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1778 | if (!tmpnew) { | |
1779 | ret = -ENOMEM; | |
1780 | goto error; | |
1781 | } | |
1782 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1783 | strcat(tmpnew, consumerd64_libdir); | |
1784 | if (tmp[0] != '\0') { | |
1785 | strcat(tmpnew, ":"); | |
1786 | strcat(tmpnew, tmp); | |
1787 | } | |
1788 | ret = putenv(tmpnew); | |
1789 | if (ret) { | |
1790 | ret = -errno; | |
1791 | goto error; | |
1792 | } | |
1793 | } | |
94c55f17 | 1794 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1795 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1796 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1797 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1798 | NULL); | |
8f4905da MD |
1799 | if (consumerd64_libdir[0] != '\0') { |
1800 | free(tmpnew); | |
1801 | } | |
1802 | if (ret) { | |
1803 | goto error; | |
1804 | } | |
3bd1e081 | 1805 | break; |
7753dea8 MD |
1806 | } |
1807 | case LTTNG_CONSUMER32_UST: | |
1808 | { | |
937dde8e | 1809 | char *tmpnew = NULL; |
8f4905da MD |
1810 | |
1811 | if (consumerd32_libdir[0] != '\0') { | |
1812 | char *tmp; | |
1813 | size_t tmplen; | |
1814 | ||
1815 | tmp = getenv("LD_LIBRARY_PATH"); | |
1816 | if (!tmp) { | |
1817 | tmp = ""; | |
1818 | } | |
1819 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1820 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1821 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1822 | if (!tmpnew) { | |
1823 | ret = -ENOMEM; | |
1824 | goto error; | |
1825 | } | |
1826 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1827 | strcat(tmpnew, consumerd32_libdir); | |
1828 | if (tmp[0] != '\0') { | |
1829 | strcat(tmpnew, ":"); | |
1830 | strcat(tmpnew, tmp); | |
1831 | } | |
1832 | ret = putenv(tmpnew); | |
1833 | if (ret) { | |
1834 | ret = -errno; | |
1835 | goto error; | |
1836 | } | |
1837 | } | |
94c55f17 | 1838 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1839 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1840 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1841 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1842 | NULL); | |
8f4905da MD |
1843 | if (consumerd32_libdir[0] != '\0') { |
1844 | free(tmpnew); | |
1845 | } | |
1846 | if (ret) { | |
1847 | goto error; | |
1848 | } | |
7753dea8 MD |
1849 | break; |
1850 | } | |
3bd1e081 | 1851 | default: |
76d7553f | 1852 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1853 | exit(EXIT_FAILURE); |
1854 | } | |
8c0faa1d | 1855 | if (errno != 0) { |
76d7553f | 1856 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1857 | } |
1858 | exit(EXIT_FAILURE); | |
1859 | } else if (pid > 0) { | |
1860 | ret = pid; | |
8c0faa1d | 1861 | } else { |
76d7553f | 1862 | PERROR("start consumer fork"); |
8c0faa1d | 1863 | ret = -errno; |
8c0faa1d | 1864 | } |
8f4905da | 1865 | error: |
8c0faa1d DG |
1866 | return ret; |
1867 | } | |
1868 | ||
693bd40b | 1869 | /* |
3bd1e081 | 1870 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1871 | */ |
3bd1e081 | 1872 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 1873 | { |
c617c0c6 | 1874 | int ret; |
edb8b045 DG |
1875 | |
1876 | /* | |
1877 | * Set the listen() state on the socket since there is a possible race | |
1878 | * between the exec() of the consumer daemon and this call if place in the | |
1879 | * consumer thread. See bug #366 for more details. | |
1880 | */ | |
1881 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
1882 | if (ret < 0) { | |
1883 | goto error; | |
1884 | } | |
693bd40b | 1885 | |
3bd1e081 MD |
1886 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1887 | if (consumer_data->pid != 0) { | |
1888 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1889 | goto end; |
1890 | } | |
693bd40b | 1891 | |
3bd1e081 | 1892 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1893 | if (ret < 0) { |
3bd1e081 MD |
1894 | ERR("Spawning consumerd failed"); |
1895 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1896 | goto error; |
693bd40b | 1897 | } |
c49dc785 | 1898 | |
3bd1e081 MD |
1899 | /* Setting up the consumer_data pid */ |
1900 | consumer_data->pid = ret; | |
48842b30 | 1901 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1902 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1903 | |
3bd1e081 MD |
1904 | DBG2("Spawning consumer control thread"); |
1905 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1906 | if (ret < 0) { |
3bd1e081 | 1907 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1908 | goto error; |
1909 | } | |
1910 | ||
c49dc785 | 1911 | end: |
693bd40b DG |
1912 | return 0; |
1913 | ||
1914 | error: | |
edb8b045 DG |
1915 | /* Cleanup already created socket on error. */ |
1916 | if (consumer_data->err_sock >= 0) { | |
c617c0c6 MD |
1917 | int err; |
1918 | ||
edb8b045 DG |
1919 | err = close(consumer_data->err_sock); |
1920 | if (err < 0) { | |
1921 | PERROR("close consumer data error socket"); | |
1922 | } | |
1923 | } | |
693bd40b DG |
1924 | return ret; |
1925 | } | |
1926 | ||
44a5e5eb | 1927 | /* |
139ac872 MD |
1928 | * Compute health status of each consumer. If one of them is zero (bad |
1929 | * state), we return 0. | |
44a5e5eb DG |
1930 | */ |
1931 | static int check_consumer_health(void) | |
1932 | { | |
1933 | int ret; | |
1934 | ||
139ac872 MD |
1935 | ret = health_check_state(&kconsumer_data.health) && |
1936 | health_check_state(&ustconsumer32_data.health) && | |
44a5e5eb DG |
1937 | health_check_state(&ustconsumer64_data.health); |
1938 | ||
1939 | DBG3("Health consumer check %d", ret); | |
1940 | ||
1941 | return ret; | |
1942 | } | |
1943 | ||
b73401da | 1944 | /* |
096102bd | 1945 | * Setup necessary data for kernel tracer action. |
b73401da | 1946 | */ |
096102bd | 1947 | static int init_kernel_tracer(void) |
b73401da DG |
1948 | { |
1949 | int ret; | |
b73401da | 1950 | |
096102bd DG |
1951 | /* Modprobe lttng kernel modules */ |
1952 | ret = modprobe_lttng_control(); | |
b73401da | 1953 | if (ret < 0) { |
b73401da DG |
1954 | goto error; |
1955 | } | |
1956 | ||
096102bd DG |
1957 | /* Open debugfs lttng */ |
1958 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1959 | if (kernel_tracer_fd < 0) { | |
1960 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
1961 | ret = -1; |
1962 | goto error_open; | |
54d01ffb DG |
1963 | } |
1964 | ||
2f77fc4b DG |
1965 | /* Validate kernel version */ |
1966 | ret = kernel_validate_version(kernel_tracer_fd); | |
1967 | if (ret < 0) { | |
1968 | goto error_version; | |
b551a063 | 1969 | } |
54d01ffb | 1970 | |
2f77fc4b DG |
1971 | ret = modprobe_lttng_data(); |
1972 | if (ret < 0) { | |
1973 | goto error_modules; | |
54d01ffb DG |
1974 | } |
1975 | ||
2f77fc4b DG |
1976 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
1977 | return 0; | |
1978 | ||
1979 | error_version: | |
1980 | modprobe_remove_lttng_control(); | |
1981 | ret = close(kernel_tracer_fd); | |
1982 | if (ret) { | |
1983 | PERROR("close"); | |
b551a063 | 1984 | } |
2f77fc4b | 1985 | kernel_tracer_fd = -1; |
f73fabfd | 1986 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 1987 | |
2f77fc4b DG |
1988 | error_modules: |
1989 | ret = close(kernel_tracer_fd); | |
1990 | if (ret) { | |
1991 | PERROR("close"); | |
b551a063 | 1992 | } |
54d01ffb | 1993 | |
2f77fc4b DG |
1994 | error_open: |
1995 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
1996 | |
1997 | error: | |
2f77fc4b DG |
1998 | WARN("No kernel tracer available"); |
1999 | kernel_tracer_fd = -1; | |
2000 | if (!is_root) { | |
f73fabfd | 2001 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2002 | } else { |
f73fabfd | 2003 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2004 | } |
54d01ffb DG |
2005 | } |
2006 | ||
2f77fc4b | 2007 | |
54d01ffb | 2008 | /* |
2f77fc4b DG |
2009 | * Copy consumer output from the tracing session to the domain session. The |
2010 | * function also applies the right modification on a per domain basis for the | |
2011 | * trace files destination directory. | |
54d01ffb | 2012 | */ |
2f77fc4b | 2013 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2014 | { |
2015 | int ret; | |
2f77fc4b DG |
2016 | const char *dir_name; |
2017 | struct consumer_output *consumer; | |
2018 | ||
2019 | assert(session); | |
2020 | assert(session->consumer); | |
54d01ffb | 2021 | |
b551a063 DG |
2022 | switch (domain) { |
2023 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2024 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2025 | /* |
2026 | * XXX: We should audit the session creation and what this function | |
2027 | * does "extra" in order to avoid a destroy since this function is used | |
2028 | * in the domain session creation (kernel and ust) only. Same for UST | |
2029 | * domain. | |
2030 | */ | |
2031 | if (session->kernel_session->consumer) { | |
2032 | consumer_destroy_output(session->kernel_session->consumer); | |
2033 | } | |
2f77fc4b DG |
2034 | session->kernel_session->consumer = |
2035 | consumer_copy_output(session->consumer); | |
2036 | /* Ease our life a bit for the next part */ | |
2037 | consumer = session->kernel_session->consumer; | |
2038 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2039 | break; |
2040 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2041 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2042 | if (session->ust_session->consumer) { |
2043 | consumer_destroy_output(session->ust_session->consumer); | |
2044 | } | |
2f77fc4b DG |
2045 | session->ust_session->consumer = |
2046 | consumer_copy_output(session->consumer); | |
2047 | /* Ease our life a bit for the next part */ | |
2048 | consumer = session->ust_session->consumer; | |
2049 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2050 | break; |
2051 | default: | |
f73fabfd | 2052 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2053 | goto error; |
2054 | } | |
2055 | ||
2f77fc4b | 2056 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2057 | strncat(consumer->subdir, dir_name, |
2058 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2059 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2060 | ||
f73fabfd | 2061 | ret = LTTNG_OK; |
54d01ffb DG |
2062 | |
2063 | error: | |
2064 | return ret; | |
2065 | } | |
2066 | ||
00e2e675 | 2067 | /* |
2f77fc4b | 2068 | * Create an UST session and add it to the session ust list. |
00e2e675 | 2069 | */ |
2f77fc4b DG |
2070 | static int create_ust_session(struct ltt_session *session, |
2071 | struct lttng_domain *domain) | |
00e2e675 DG |
2072 | { |
2073 | int ret; | |
2f77fc4b | 2074 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2075 | |
a4b92340 | 2076 | assert(session); |
2f77fc4b DG |
2077 | assert(domain); |
2078 | assert(session->consumer); | |
a4b92340 | 2079 | |
2f77fc4b DG |
2080 | switch (domain->type) { |
2081 | case LTTNG_DOMAIN_UST: | |
2082 | break; | |
2083 | default: | |
2084 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2085 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2086 | goto error; |
2087 | } | |
2088 | ||
2f77fc4b DG |
2089 | DBG("Creating UST session"); |
2090 | ||
2091 | lus = trace_ust_create_session(session->path, session->id, domain); | |
2092 | if (lus == NULL) { | |
f73fabfd | 2093 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2094 | goto error; |
2095 | } | |
2096 | ||
2f77fc4b DG |
2097 | lus->uid = session->uid; |
2098 | lus->gid = session->gid; | |
2099 | session->ust_session = lus; | |
00e2e675 | 2100 | |
2f77fc4b DG |
2101 | /* Copy session output to the newly created UST session */ |
2102 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2103 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2104 | goto error; |
2105 | } | |
2106 | ||
f73fabfd | 2107 | return LTTNG_OK; |
00e2e675 DG |
2108 | |
2109 | error: | |
2f77fc4b DG |
2110 | free(lus); |
2111 | session->ust_session = NULL; | |
00e2e675 DG |
2112 | return ret; |
2113 | } | |
2114 | ||
2115 | /* | |
2f77fc4b | 2116 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2117 | */ |
2f77fc4b | 2118 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2119 | { |
2120 | int ret; | |
a4b92340 | 2121 | |
2f77fc4b | 2122 | DBG("Creating kernel session"); |
00e2e675 | 2123 | |
2f77fc4b DG |
2124 | ret = kernel_create_session(session, kernel_tracer_fd); |
2125 | if (ret < 0) { | |
f73fabfd | 2126 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2127 | goto error; |
2128 | } | |
2129 | ||
2f77fc4b DG |
2130 | /* Code flow safety */ |
2131 | assert(session->kernel_session); | |
2132 | ||
2133 | /* Copy session output to the newly created Kernel session */ | |
2134 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2135 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2136 | goto error; |
2137 | } | |
2138 | ||
2f77fc4b DG |
2139 | /* Create directory(ies) on local filesystem. */ |
2140 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2141 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2142 | ret = run_as_mkdir_recursive( | |
2143 | session->kernel_session->consumer->dst.trace_path, | |
2144 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2145 | if (ret < 0) { | |
2146 | if (ret != -EEXIST) { | |
2147 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2148 | goto error; |
2149 | } | |
00e2e675 | 2150 | } |
2f77fc4b | 2151 | } |
00e2e675 | 2152 | |
2f77fc4b DG |
2153 | session->kernel_session->uid = session->uid; |
2154 | session->kernel_session->gid = session->gid; | |
00e2e675 | 2155 | |
f73fabfd | 2156 | return LTTNG_OK; |
00e2e675 | 2157 | |
2f77fc4b DG |
2158 | error: |
2159 | trace_kernel_destroy_session(session->kernel_session); | |
2160 | session->kernel_session = NULL; | |
2161 | return ret; | |
2162 | } | |
00e2e675 | 2163 | |
2f77fc4b DG |
2164 | /* |
2165 | * Count number of session permitted by uid/gid. | |
2166 | */ | |
2167 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2168 | { | |
2169 | unsigned int i = 0; | |
2170 | struct ltt_session *session; | |
07424f16 | 2171 | |
2f77fc4b DG |
2172 | DBG("Counting number of available session for UID %d GID %d", |
2173 | uid, gid); | |
2174 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2175 | /* |
2f77fc4b | 2176 | * Only list the sessions the user can control. |
00e2e675 | 2177 | */ |
2f77fc4b DG |
2178 | if (!session_access_ok(session, uid, gid)) { |
2179 | continue; | |
2180 | } | |
2181 | i++; | |
a4b92340 | 2182 | } |
2f77fc4b | 2183 | return i; |
00e2e675 DG |
2184 | } |
2185 | ||
54d01ffb DG |
2186 | /* |
2187 | * Process the command requested by the lttng client within the command | |
2188 | * context structure. This function make sure that the return structure (llm) | |
2189 | * is set and ready for transmission before returning. | |
2190 | * | |
2191 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2192 | * |
2193 | * "sock" is only used for special-case var. len data. | |
54d01ffb | 2194 | */ |
53a80697 MD |
2195 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2196 | int *sock_error) | |
54d01ffb | 2197 | { |
f73fabfd | 2198 | int ret = LTTNG_OK; |
44d3bd01 | 2199 | int need_tracing_session = 1; |
2e09ba09 | 2200 | int need_domain; |
54d01ffb DG |
2201 | |
2202 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2203 | ||
53a80697 MD |
2204 | *sock_error = 0; |
2205 | ||
2e09ba09 MD |
2206 | switch (cmd_ctx->lsm->cmd_type) { |
2207 | case LTTNG_CREATE_SESSION: | |
2208 | case LTTNG_DESTROY_SESSION: | |
2209 | case LTTNG_LIST_SESSIONS: | |
2210 | case LTTNG_LIST_DOMAINS: | |
2211 | case LTTNG_START_TRACE: | |
2212 | case LTTNG_STOP_TRACE: | |
6d805429 | 2213 | case LTTNG_DATA_PENDING: |
2e09ba09 | 2214 | need_domain = 0; |
3aace903 | 2215 | break; |
2e09ba09 MD |
2216 | default: |
2217 | need_domain = 1; | |
2218 | } | |
2219 | ||
2220 | if (opt_no_kernel && need_domain | |
2221 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2222 | if (!is_root) { |
f73fabfd | 2223 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2224 | } else { |
f73fabfd | 2225 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2226 | } |
4fba7219 DG |
2227 | goto error; |
2228 | } | |
2229 | ||
8d3113b2 DG |
2230 | /* Deny register consumer if we already have a spawned consumer. */ |
2231 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2232 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2233 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2234 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2235 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2236 | goto error; |
2237 | } | |
2238 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2239 | } | |
2240 | ||
54d01ffb DG |
2241 | /* |
2242 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2243 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2244 | * command. |
2245 | */ | |
2246 | switch(cmd_ctx->lsm->cmd_type) { | |
2247 | case LTTNG_LIST_SESSIONS: | |
2248 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2249 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2250 | case LTTNG_LIST_DOMAINS: |
2251 | case LTTNG_LIST_CHANNELS: | |
2252 | case LTTNG_LIST_EVENTS: | |
2253 | break; | |
2254 | default: | |
2255 | /* Setup lttng message with no payload */ | |
2256 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2257 | if (ret < 0) { | |
2258 | /* This label does not try to unlock the session */ | |
2259 | goto init_setup_error; | |
2260 | } | |
2261 | } | |
2262 | ||
2263 | /* Commands that DO NOT need a session. */ | |
2264 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2265 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 2266 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2267 | case LTTNG_LIST_SESSIONS: |
2268 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2269 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2270 | need_tracing_session = 0; |
54d01ffb DG |
2271 | break; |
2272 | default: | |
2273 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2274 | /* |
2275 | * We keep the session list lock across _all_ commands | |
2276 | * for now, because the per-session lock does not | |
2277 | * handle teardown properly. | |
2278 | */ | |
74babd95 | 2279 | session_lock_list(); |
54d01ffb DG |
2280 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2281 | if (cmd_ctx->session == NULL) { | |
2282 | if (cmd_ctx->lsm->session.name != NULL) { | |
f73fabfd | 2283 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2284 | } else { |
2285 | /* If no session name specified */ | |
f73fabfd | 2286 | ret = LTTNG_ERR_SELECT_SESS; |
54d01ffb DG |
2287 | } |
2288 | goto error; | |
2289 | } else { | |
2290 | /* Acquire lock for the session */ | |
2291 | session_lock(cmd_ctx->session); | |
2292 | } | |
2293 | break; | |
2294 | } | |
b389abbe | 2295 | |
2e09ba09 MD |
2296 | if (!need_domain) { |
2297 | goto skip_domain; | |
2298 | } | |
a4b92340 | 2299 | |
54d01ffb DG |
2300 | /* |
2301 | * Check domain type for specific "pre-action". | |
2302 | */ | |
2303 | switch (cmd_ctx->lsm->domain.type) { | |
2304 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2305 | if (!is_root) { |
f73fabfd | 2306 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2307 | goto error; |
2308 | } | |
2309 | ||
54d01ffb | 2310 | /* Kernel tracer check */ |
a4b35e07 | 2311 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2312 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2313 | ret = init_kernel_tracer(); |
2314 | if (ret != 0) { | |
54d01ffb DG |
2315 | goto error; |
2316 | } | |
2317 | } | |
5eb91c98 | 2318 | |
5c827ce0 DG |
2319 | /* Consumer is in an ERROR state. Report back to client */ |
2320 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2321 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2322 | goto error; |
2323 | } | |
2324 | ||
54d01ffb | 2325 | /* Need a session for kernel command */ |
44d3bd01 | 2326 | if (need_tracing_session) { |
54d01ffb | 2327 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2328 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2329 | if (ret < 0) { |
f73fabfd | 2330 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2331 | goto error; |
2332 | } | |
b389abbe | 2333 | } |
7d29a247 | 2334 | |
54d01ffb | 2335 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2336 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2337 | if (kconsumer_data.pid == 0 && | |
a4b92340 DG |
2338 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2339 | cmd_ctx->session->start_consumer) { | |
3bd1e081 MD |
2340 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2341 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2342 | if (ret < 0) { |
f73fabfd | 2343 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2344 | goto error; |
950131af | 2345 | } |
5c827ce0 | 2346 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2347 | } else { |
2348 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2349 | } |
173af62f | 2350 | |
a4b92340 DG |
2351 | /* |
2352 | * The consumer was just spawned so we need to add the socket to | |
2353 | * the consumer output of the session if exist. | |
2354 | */ | |
2355 | ret = consumer_create_socket(&kconsumer_data, | |
2356 | cmd_ctx->session->kernel_session->consumer); | |
2357 | if (ret < 0) { | |
2358 | goto error; | |
173af62f | 2359 | } |
0d0c377a | 2360 | } |
5c827ce0 | 2361 | |
54d01ffb | 2362 | break; |
2bdd86d4 | 2363 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2364 | { |
5c827ce0 DG |
2365 | /* Consumer is in an ERROR state. Report back to client */ |
2366 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2367 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2368 | goto error; |
2369 | } | |
2370 | ||
44d3bd01 | 2371 | if (need_tracing_session) { |
a4b92340 | 2372 | /* Create UST session if none exist. */ |
f6a9efaa | 2373 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2374 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2375 | &cmd_ctx->lsm->domain); |
f73fabfd | 2376 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2377 | goto error; |
2378 | } | |
2379 | } | |
00e2e675 | 2380 | |
7753dea8 MD |
2381 | /* Start the UST consumer daemons */ |
2382 | /* 64-bit */ | |
2383 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2384 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2385 | ustconsumer64_data.pid == 0 && |
a4b92340 DG |
2386 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2387 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2388 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2389 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2390 | if (ret < 0) { |
f73fabfd | 2391 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2392 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2393 | goto error; |
2394 | } | |
48842b30 | 2395 | |
173af62f | 2396 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2397 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2398 | } else { |
7753dea8 MD |
2399 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2400 | } | |
173af62f DG |
2401 | |
2402 | /* | |
2403 | * Setup socket for consumer 64 bit. No need for atomic access | |
2404 | * since it was set above and can ONLY be set in this thread. | |
2405 | */ | |
a4b92340 DG |
2406 | ret = consumer_create_socket(&ustconsumer64_data, |
2407 | cmd_ctx->session->ust_session->consumer); | |
2408 | if (ret < 0) { | |
2409 | goto error; | |
173af62f DG |
2410 | } |
2411 | ||
7753dea8 | 2412 | /* 32-bit */ |
fc7a59ce | 2413 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2414 | ustconsumer32_data.pid == 0 && |
a4b92340 DG |
2415 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2416 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2417 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2418 | ret = start_consumerd(&ustconsumer32_data); | |
2419 | if (ret < 0) { | |
f73fabfd | 2420 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2421 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2422 | goto error; |
2423 | } | |
5c827ce0 | 2424 | |
173af62f | 2425 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2426 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2427 | } else { |
2428 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2429 | } |
173af62f DG |
2430 | |
2431 | /* | |
2432 | * Setup socket for consumer 64 bit. No need for atomic access | |
2433 | * since it was set above and can ONLY be set in this thread. | |
2434 | */ | |
a4b92340 DG |
2435 | ret = consumer_create_socket(&ustconsumer32_data, |
2436 | cmd_ctx->session->ust_session->consumer); | |
2437 | if (ret < 0) { | |
2438 | goto error; | |
173af62f | 2439 | } |
44d3bd01 DG |
2440 | } |
2441 | break; | |
48842b30 | 2442 | } |
54d01ffb | 2443 | default: |
54d01ffb DG |
2444 | break; |
2445 | } | |
2e09ba09 | 2446 | skip_domain: |
33a2b854 | 2447 | |
5c827ce0 DG |
2448 | /* Validate consumer daemon state when start/stop trace command */ |
2449 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2450 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2451 | switch (cmd_ctx->lsm->domain.type) { | |
2452 | case LTTNG_DOMAIN_UST: | |
2453 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2454 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2455 | goto error; |
2456 | } | |
2457 | break; | |
2458 | case LTTNG_DOMAIN_KERNEL: | |
2459 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2460 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2461 | goto error; |
2462 | } | |
2463 | break; | |
2464 | } | |
2465 | } | |
2466 | ||
8e0af1b4 MD |
2467 | /* |
2468 | * Check that the UID or GID match that of the tracing session. | |
2469 | * The root user can interact with all sessions. | |
2470 | */ | |
2471 | if (need_tracing_session) { | |
2472 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2473 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2474 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2475 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2476 | goto error; |
2477 | } | |
2478 | } | |
2479 | ||
54d01ffb DG |
2480 | /* Process by command type */ |
2481 | switch (cmd_ctx->lsm->cmd_type) { | |
2482 | case LTTNG_ADD_CONTEXT: | |
2483 | { | |
2484 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2485 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2486 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2487 | break; |
2488 | } | |
2489 | case LTTNG_DISABLE_CHANNEL: | |
2490 | { | |
2491 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2492 | cmd_ctx->lsm->u.disable.channel_name); | |
2493 | break; | |
2494 | } | |
2495 | case LTTNG_DISABLE_EVENT: | |
2496 | { | |
2497 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2498 | cmd_ctx->lsm->u.disable.channel_name, | |
2499 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2500 | break; |
2501 | } | |
54d01ffb DG |
2502 | case LTTNG_DISABLE_ALL_EVENT: |
2503 | { | |
2bdd86d4 | 2504 | DBG("Disabling all events"); |
54d01ffb DG |
2505 | |
2506 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2507 | cmd_ctx->lsm->u.disable.channel_name); | |
2508 | break; | |
2509 | } | |
00e2e675 DG |
2510 | case LTTNG_DISABLE_CONSUMER: |
2511 | { | |
2512 | ret = cmd_disable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); | |
2513 | break; | |
2514 | } | |
54d01ffb DG |
2515 | case LTTNG_ENABLE_CHANNEL: |
2516 | { | |
aea829b3 | 2517 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2518 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2519 | break; |
2520 | } | |
00e2e675 DG |
2521 | case LTTNG_ENABLE_CONSUMER: |
2522 | { | |
a4b92340 DG |
2523 | /* |
2524 | * XXX: 0 means that this URI should be applied on the session. Should | |
2525 | * be a DOMAIN enuam. | |
2526 | */ | |
00e2e675 | 2527 | ret = cmd_enable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); |
f73fabfd | 2528 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2529 | goto error; |
2530 | } | |
2531 | ||
2532 | if (cmd_ctx->lsm->domain.type == 0) { | |
2533 | /* Add the URI for the UST session if a consumer is present. */ | |
2534 | if (cmd_ctx->session->ust_session && | |
2535 | cmd_ctx->session->ust_session->consumer) { | |
2536 | ret = cmd_enable_consumer(LTTNG_DOMAIN_UST, cmd_ctx->session); | |
2537 | } else if (cmd_ctx->session->kernel_session && | |
2538 | cmd_ctx->session->kernel_session->consumer) { | |
2539 | ret = cmd_enable_consumer(LTTNG_DOMAIN_KERNEL, | |
2540 | cmd_ctx->session); | |
2541 | } | |
2542 | } | |
00e2e675 DG |
2543 | break; |
2544 | } | |
54d01ffb DG |
2545 | case LTTNG_ENABLE_EVENT: |
2546 | { | |
2547 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2548 | cmd_ctx->lsm->u.enable.channel_name, | |
025faf73 | 2549 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2550 | break; |
2551 | } | |
2552 | case LTTNG_ENABLE_ALL_EVENT: | |
2553 | { | |
2bdd86d4 | 2554 | DBG("Enabling all events"); |
54d01ffb DG |
2555 | |
2556 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 | 2557 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2558 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2559 | break; |
2560 | } | |
052da939 | 2561 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2562 | { |
9f19cc17 | 2563 | struct lttng_event *events; |
54d01ffb | 2564 | ssize_t nb_events; |
052da939 | 2565 | |
54d01ffb DG |
2566 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2567 | if (nb_events < 0) { | |
f73fabfd | 2568 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2569 | ret = -nb_events; |
2570 | goto error; | |
2ef84c95 DG |
2571 | } |
2572 | ||
2573 | /* | |
2574 | * Setup lttng message with payload size set to the event list size in | |
2575 | * bytes and then copy list into the llm payload. | |
2576 | */ | |
052da939 | 2577 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2578 | if (ret < 0) { |
052da939 | 2579 | free(events); |
2ef84c95 DG |
2580 | goto setup_error; |
2581 | } | |
2582 | ||
2583 | /* Copy event list into message payload */ | |
9f19cc17 | 2584 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2585 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2586 | |
9f19cc17 | 2587 | free(events); |
2ef84c95 | 2588 | |
f73fabfd | 2589 | ret = LTTNG_OK; |
2ef84c95 DG |
2590 | break; |
2591 | } | |
f37d259d MD |
2592 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2593 | { | |
2594 | struct lttng_event_field *fields; | |
2595 | ssize_t nb_fields; | |
2596 | ||
a4b92340 DG |
2597 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2598 | &fields); | |
f37d259d | 2599 | if (nb_fields < 0) { |
f73fabfd | 2600 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2601 | ret = -nb_fields; |
2602 | goto error; | |
2603 | } | |
2604 | ||
2605 | /* | |
2606 | * Setup lttng message with payload size set to the event list size in | |
2607 | * bytes and then copy list into the llm payload. | |
2608 | */ | |
a4b92340 DG |
2609 | ret = setup_lttng_msg(cmd_ctx, |
2610 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2611 | if (ret < 0) { |
2612 | free(fields); | |
2613 | goto setup_error; | |
2614 | } | |
2615 | ||
2616 | /* Copy event list into message payload */ | |
2617 | memcpy(cmd_ctx->llm->payload, fields, | |
2618 | sizeof(struct lttng_event_field) * nb_fields); | |
2619 | ||
2620 | free(fields); | |
2621 | ||
f73fabfd | 2622 | ret = LTTNG_OK; |
f37d259d MD |
2623 | break; |
2624 | } | |
00e2e675 DG |
2625 | case LTTNG_SET_CONSUMER_URI: |
2626 | { | |
a4b92340 DG |
2627 | size_t nb_uri, len; |
2628 | struct lttng_uri *uris; | |
2629 | ||
2630 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2631 | len = nb_uri * sizeof(struct lttng_uri); | |
2632 | ||
2633 | if (nb_uri == 0) { | |
f73fabfd | 2634 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2635 | goto error; |
2636 | } | |
2637 | ||
2638 | uris = zmalloc(len); | |
2639 | if (uris == NULL) { | |
f73fabfd | 2640 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2641 | goto error; |
2642 | } | |
2643 | ||
2644 | /* Receive variable len data */ | |
77c7c900 | 2645 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2646 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2647 | if (ret <= 0) { | |
2648 | DBG("No URIs received from client... continuing"); | |
2649 | *sock_error = 1; | |
f73fabfd | 2650 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2651 | free(uris); |
a4b92340 DG |
2652 | goto error; |
2653 | } | |
2654 | ||
00e2e675 | 2655 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2656 | nb_uri, uris); |
f73fabfd | 2657 | if (ret != LTTNG_OK) { |
b1d41407 | 2658 | free(uris); |
a4b92340 DG |
2659 | goto error; |
2660 | } | |
2661 | ||
2662 | /* | |
2663 | * XXX: 0 means that this URI should be applied on the session. Should | |
2664 | * be a DOMAIN enuam. | |
2665 | */ | |
2666 | if (cmd_ctx->lsm->domain.type == 0) { | |
2667 | /* Add the URI for the UST session if a consumer is present. */ | |
2668 | if (cmd_ctx->session->ust_session && | |
2669 | cmd_ctx->session->ust_session->consumer) { | |
2670 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2671 | nb_uri, uris); | |
2672 | } else if (cmd_ctx->session->kernel_session && | |
2673 | cmd_ctx->session->kernel_session->consumer) { | |
2674 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2675 | cmd_ctx->session, nb_uri, uris); | |
2676 | } | |
2677 | } | |
2678 | ||
b1d41407 DG |
2679 | free(uris); |
2680 | ||
00e2e675 DG |
2681 | break; |
2682 | } | |
f3ed775e | 2683 | case LTTNG_START_TRACE: |
8c0faa1d | 2684 | { |
54d01ffb | 2685 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2686 | break; |
2687 | } | |
f3ed775e | 2688 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2689 | { |
54d01ffb | 2690 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2691 | break; |
2692 | } | |
5e16da05 MD |
2693 | case LTTNG_CREATE_SESSION: |
2694 | { | |
a4b92340 DG |
2695 | size_t nb_uri, len; |
2696 | struct lttng_uri *uris = NULL; | |
2697 | ||
2698 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2699 | len = nb_uri * sizeof(struct lttng_uri); | |
2700 | ||
2701 | if (nb_uri > 0) { | |
2702 | uris = zmalloc(len); | |
2703 | if (uris == NULL) { | |
f73fabfd | 2704 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2705 | goto error; |
2706 | } | |
2707 | ||
2708 | /* Receive variable len data */ | |
77c7c900 | 2709 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
2710 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2711 | if (ret <= 0) { | |
2712 | DBG("No URIs received from client... continuing"); | |
2713 | *sock_error = 1; | |
f73fabfd | 2714 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2715 | free(uris); |
a4b92340 DG |
2716 | goto error; |
2717 | } | |
2718 | ||
2719 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
2720 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 2721 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2722 | free(uris); |
a4b92340 DG |
2723 | goto error; |
2724 | } | |
2725 | } | |
2726 | ||
2727 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
2728 | &cmd_ctx->creds); | |
2729 | ||
b1d41407 DG |
2730 | free(uris); |
2731 | ||
00e2e675 DG |
2732 | break; |
2733 | } | |
5e16da05 MD |
2734 | case LTTNG_DESTROY_SESSION: |
2735 | { | |
2f77fc4b | 2736 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
2737 | |
2738 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 2739 | cmd_ctx->session = NULL; |
5461b305 | 2740 | break; |
5e16da05 | 2741 | } |
9f19cc17 | 2742 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2743 | { |
54d01ffb DG |
2744 | ssize_t nb_dom; |
2745 | struct lttng_domain *domains; | |
5461b305 | 2746 | |
54d01ffb DG |
2747 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2748 | if (nb_dom < 0) { | |
f73fabfd | 2749 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2750 | ret = -nb_dom; |
2751 | goto error; | |
ce3d728c | 2752 | } |
520ff687 | 2753 | |
54d01ffb | 2754 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2755 | if (ret < 0) { |
2756 | goto setup_error; | |
520ff687 | 2757 | } |
57167058 | 2758 | |
54d01ffb DG |
2759 | /* Copy event list into message payload */ |
2760 | memcpy(cmd_ctx->llm->payload, domains, | |
2761 | nb_dom * sizeof(struct lttng_domain)); | |
2762 | ||
2763 | free(domains); | |
5e16da05 | 2764 | |
f73fabfd | 2765 | ret = LTTNG_OK; |
5e16da05 MD |
2766 | break; |
2767 | } | |
9f19cc17 | 2768 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2769 | { |
6775595e | 2770 | int nb_chan; |
54d01ffb DG |
2771 | struct lttng_channel *channels; |
2772 | ||
b551a063 DG |
2773 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
2774 | cmd_ctx->session, &channels); | |
54d01ffb | 2775 | if (nb_chan < 0) { |
f73fabfd | 2776 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2777 | ret = -nb_chan; |
2778 | goto error; | |
5461b305 | 2779 | } |
ca95a216 | 2780 | |
54d01ffb | 2781 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2782 | if (ret < 0) { |
2783 | goto setup_error; | |
2784 | } | |
9f19cc17 | 2785 | |
54d01ffb DG |
2786 | /* Copy event list into message payload */ |
2787 | memcpy(cmd_ctx->llm->payload, channels, | |
2788 | nb_chan * sizeof(struct lttng_channel)); | |
2789 | ||
2790 | free(channels); | |
9f19cc17 | 2791 | |
f73fabfd | 2792 | ret = LTTNG_OK; |
5461b305 | 2793 | break; |
5e16da05 | 2794 | } |
9f19cc17 | 2795 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2796 | { |
b551a063 | 2797 | ssize_t nb_event; |
684d34d2 | 2798 | struct lttng_event *events = NULL; |
9f19cc17 | 2799 | |
b551a063 | 2800 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
2801 | cmd_ctx->lsm->u.list.channel_name, &events); |
2802 | if (nb_event < 0) { | |
f73fabfd | 2803 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2804 | ret = -nb_event; |
2805 | goto error; | |
5461b305 | 2806 | } |
ca95a216 | 2807 | |
54d01ffb | 2808 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2809 | if (ret < 0) { |
2810 | goto setup_error; | |
2811 | } | |
9f19cc17 | 2812 | |
54d01ffb DG |
2813 | /* Copy event list into message payload */ |
2814 | memcpy(cmd_ctx->llm->payload, events, | |
2815 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2816 | |
54d01ffb | 2817 | free(events); |
9f19cc17 | 2818 | |
f73fabfd | 2819 | ret = LTTNG_OK; |
5461b305 | 2820 | break; |
5e16da05 MD |
2821 | } |
2822 | case LTTNG_LIST_SESSIONS: | |
2823 | { | |
8e0af1b4 | 2824 | unsigned int nr_sessions; |
5461b305 | 2825 | |
8e0af1b4 | 2826 | session_lock_list(); |
730389d9 DG |
2827 | nr_sessions = lttng_sessions_count( |
2828 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2829 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 2830 | |
8e0af1b4 | 2831 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 2832 | if (ret < 0) { |
54d01ffb | 2833 | session_unlock_list(); |
5461b305 | 2834 | goto setup_error; |
e065084a | 2835 | } |
5e16da05 | 2836 | |
6c9cc2ab | 2837 | /* Filled the session array */ |
2f77fc4b | 2838 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
2839 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2840 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 2841 | |
54d01ffb | 2842 | session_unlock_list(); |
5e16da05 | 2843 | |
f73fabfd | 2844 | ret = LTTNG_OK; |
5e16da05 MD |
2845 | break; |
2846 | } | |
d0254c7c MD |
2847 | case LTTNG_CALIBRATE: |
2848 | { | |
54d01ffb DG |
2849 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2850 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2851 | break; |
2852 | } | |
d9800920 DG |
2853 | case LTTNG_REGISTER_CONSUMER: |
2854 | { | |
2f77fc4b DG |
2855 | struct consumer_data *cdata; |
2856 | ||
2857 | switch (cmd_ctx->lsm->domain.type) { | |
2858 | case LTTNG_DOMAIN_KERNEL: | |
2859 | cdata = &kconsumer_data; | |
2860 | break; | |
2861 | default: | |
f73fabfd | 2862 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2863 | goto error; |
2864 | } | |
2865 | ||
54d01ffb | 2866 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2867 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
2868 | break; |
2869 | } | |
025faf73 | 2870 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
2871 | { |
2872 | struct lttng_filter_bytecode *bytecode; | |
2873 | ||
025faf73 | 2874 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 2875 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2876 | goto error; |
2877 | } | |
52df2401 MD |
2878 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
2879 | ret = LTTNG_ERR_FILTER_INVAL; | |
2880 | goto error; | |
2881 | } | |
025faf73 | 2882 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 2883 | if (!bytecode) { |
f73fabfd | 2884 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
2885 | goto error; |
2886 | } | |
2887 | /* Receive var. len. data */ | |
2888 | DBG("Receiving var len data from client ..."); | |
2889 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 2890 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
2891 | if (ret <= 0) { |
2892 | DBG("Nothing recv() from client var len data... continuing"); | |
2893 | *sock_error = 1; | |
f73fabfd | 2894 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2895 | goto error; |
2896 | } | |
2897 | ||
2898 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 2899 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 2900 | free(bytecode); |
f73fabfd | 2901 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2902 | goto error; |
2903 | } | |
2904 | ||
025faf73 DG |
2905 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2906 | cmd_ctx->lsm->u.enable.channel_name, | |
2907 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
2908 | break; |
2909 | } | |
6d805429 | 2910 | case LTTNG_DATA_PENDING: |
806e2684 | 2911 | { |
6d805429 | 2912 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
2913 | break; |
2914 | } | |
5e16da05 | 2915 | default: |
f73fabfd | 2916 | ret = LTTNG_ERR_UND; |
5461b305 | 2917 | break; |
fac6795d DG |
2918 | } |
2919 | ||
5461b305 | 2920 | error: |
5461b305 DG |
2921 | if (cmd_ctx->llm == NULL) { |
2922 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2923 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2924 | goto setup_error; |
2925 | } | |
2926 | } | |
54d01ffb | 2927 | /* Set return code */ |
5461b305 | 2928 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2929 | setup_error: |
b5541356 | 2930 | if (cmd_ctx->session) { |
54d01ffb | 2931 | session_unlock(cmd_ctx->session); |
b5541356 | 2932 | } |
256a5576 MD |
2933 | if (need_tracing_session) { |
2934 | session_unlock_list(); | |
2935 | } | |
54d01ffb | 2936 | init_setup_error: |
8028d920 | 2937 | return ret; |
fac6795d DG |
2938 | } |
2939 | ||
44a5e5eb DG |
2940 | /* |
2941 | * Thread managing health check socket. | |
2942 | */ | |
2943 | static void *thread_manage_health(void *data) | |
2944 | { | |
eb4a2943 | 2945 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
2946 | uint32_t revents, nb_fd; |
2947 | struct lttng_poll_event events; | |
2948 | struct lttcomm_health_msg msg; | |
2949 | struct lttcomm_health_data reply; | |
2950 | ||
2951 | DBG("[thread] Manage health check started"); | |
2952 | ||
2953 | rcu_register_thread(); | |
2954 | ||
2955 | /* Create unix socket */ | |
2956 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
2957 | if (sock < 0) { | |
2958 | ERR("Unable to create health check Unix socket"); | |
2959 | ret = -1; | |
2960 | goto error; | |
2961 | } | |
2962 | ||
b662582b DG |
2963 | /* |
2964 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2965 | * show must go on. | |
2966 | */ | |
2967 | (void) utils_set_fd_cloexec(sock); | |
2968 | ||
44a5e5eb DG |
2969 | ret = lttcomm_listen_unix_sock(sock); |
2970 | if (ret < 0) { | |
2971 | goto error; | |
2972 | } | |
2973 | ||
2974 | /* | |
2975 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2976 | * more will be added to this poll set. | |
2977 | */ | |
2978 | ret = create_thread_poll_set(&events, 2); | |
2979 | if (ret < 0) { | |
2980 | goto error; | |
2981 | } | |
2982 | ||
2983 | /* Add the application registration socket */ | |
2984 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
2985 | if (ret < 0) { | |
2986 | goto error; | |
2987 | } | |
2988 | ||
2989 | while (1) { | |
2990 | DBG("Health check ready"); | |
2991 | ||
44a5e5eb DG |
2992 | /* Inifinite blocking call, waiting for transmission */ |
2993 | restart: | |
2994 | ret = lttng_poll_wait(&events, -1); | |
2995 | if (ret < 0) { | |
2996 | /* | |
2997 | * Restart interrupted system call. | |
2998 | */ | |
2999 | if (errno == EINTR) { | |
3000 | goto restart; | |
3001 | } | |
3002 | goto error; | |
3003 | } | |
3004 | ||
0d9c5d77 DG |
3005 | nb_fd = ret; |
3006 | ||
44a5e5eb DG |
3007 | for (i = 0; i < nb_fd; i++) { |
3008 | /* Fetch once the poll data */ | |
3009 | revents = LTTNG_POLL_GETEV(&events, i); | |
3010 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3011 | ||
3012 | /* Thread quit pipe has been closed. Killing thread. */ | |
3013 | ret = check_thread_quit_pipe(pollfd, revents); | |
3014 | if (ret) { | |
139ac872 MD |
3015 | err = 0; |
3016 | goto exit; | |
44a5e5eb DG |
3017 | } |
3018 | ||
3019 | /* Event on the registration socket */ | |
3020 | if (pollfd == sock) { | |
3021 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3022 | ERR("Health socket poll error"); | |
3023 | goto error; | |
3024 | } | |
3025 | } | |
3026 | } | |
3027 | ||
3028 | new_sock = lttcomm_accept_unix_sock(sock); | |
3029 | if (new_sock < 0) { | |
3030 | goto error; | |
3031 | } | |
3032 | ||
b662582b DG |
3033 | /* |
3034 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3035 | * show must go on. | |
3036 | */ | |
3037 | (void) utils_set_fd_cloexec(new_sock); | |
3038 | ||
44a5e5eb DG |
3039 | DBG("Receiving data from client for health..."); |
3040 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3041 | if (ret <= 0) { | |
3042 | DBG("Nothing recv() from client... continuing"); | |
3043 | ret = close(new_sock); | |
3044 | if (ret) { | |
3045 | PERROR("close"); | |
3046 | } | |
3047 | new_sock = -1; | |
3048 | continue; | |
3049 | } | |
3050 | ||
3051 | rcu_thread_online(); | |
3052 | ||
3053 | switch (msg.component) { | |
3054 | case LTTNG_HEALTH_CMD: | |
3055 | reply.ret_code = health_check_state(&health_thread_cmd); | |
3056 | break; | |
139ac872 MD |
3057 | case LTTNG_HEALTH_APP_MANAGE: |
3058 | reply.ret_code = health_check_state(&health_thread_app_manage); | |
3059 | break; | |
44a5e5eb DG |
3060 | case LTTNG_HEALTH_APP_REG: |
3061 | reply.ret_code = health_check_state(&health_thread_app_reg); | |
3062 | break; | |
3063 | case LTTNG_HEALTH_KERNEL: | |
3064 | reply.ret_code = health_check_state(&health_thread_kernel); | |
3065 | break; | |
3066 | case LTTNG_HEALTH_CONSUMER: | |
3067 | reply.ret_code = check_consumer_health(); | |
3068 | break; | |
3069 | case LTTNG_HEALTH_ALL: | |
44a5e5eb | 3070 | reply.ret_code = |
139ac872 MD |
3071 | health_check_state(&health_thread_app_manage) && |
3072 | health_check_state(&health_thread_app_reg) && | |
3073 | health_check_state(&health_thread_cmd) && | |
3074 | health_check_state(&health_thread_kernel) && | |
3075 | check_consumer_health(); | |
44a5e5eb DG |
3076 | break; |
3077 | default: | |
f73fabfd | 3078 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3079 | break; |
3080 | } | |
3081 | ||
3082 | /* | |
3083 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3084 | * the client where in the sessiond it is the opposite. Again, this is | |
3085 | * just to make things easier for us poor developer which enjoy a lot | |
3086 | * lazyness. | |
3087 | */ | |
3088 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3089 | reply.ret_code = !reply.ret_code; | |
3090 | } | |
3091 | ||
3092 | DBG2("Health check return value %d", reply.ret_code); | |
3093 | ||
3094 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3095 | if (ret < 0) { | |
3096 | ERR("Failed to send health data back to client"); | |
3097 | } | |
3098 | ||
3099 | /* End of transmission */ | |
3100 | ret = close(new_sock); | |
3101 | if (ret) { | |
3102 | PERROR("close"); | |
3103 | } | |
3104 | new_sock = -1; | |
3105 | } | |
3106 | ||
139ac872 | 3107 | exit: |
44a5e5eb | 3108 | error: |
139ac872 MD |
3109 | if (err) { |
3110 | ERR("Health error occurred in %s", __func__); | |
3111 | } | |
44a5e5eb DG |
3112 | DBG("Health check thread dying"); |
3113 | unlink(health_unix_sock_path); | |
3114 | if (sock >= 0) { | |
3115 | ret = close(sock); | |
3116 | if (ret) { | |
3117 | PERROR("close"); | |
3118 | } | |
3119 | } | |
3120 | if (new_sock >= 0) { | |
3121 | ret = close(new_sock); | |
3122 | if (ret) { | |
3123 | PERROR("close"); | |
3124 | } | |
3125 | } | |
3126 | ||
3127 | lttng_poll_clean(&events); | |
3128 | ||
3129 | rcu_unregister_thread(); | |
3130 | return NULL; | |
3131 | } | |
3132 | ||
1d4b027a | 3133 | /* |
d063d709 DG |
3134 | * This thread manage all clients request using the unix client socket for |
3135 | * communication. | |
1d4b027a DG |
3136 | */ |
3137 | static void *thread_manage_clients(void *data) | |
3138 | { | |
139ac872 | 3139 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3140 | int sock_error; |
5eb91c98 | 3141 | uint32_t revents, nb_fd; |
273ea72c | 3142 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3143 | struct lttng_poll_event events; |
1d4b027a DG |
3144 | |
3145 | DBG("[thread] Manage client started"); | |
3146 | ||
f6a9efaa DG |
3147 | rcu_register_thread(); |
3148 | ||
6993eeb3 CB |
3149 | if (testpoint(thread_manage_clients)) { |
3150 | goto error_testpoint; | |
3151 | } | |
3152 | ||
44a5e5eb DG |
3153 | health_code_update(&health_thread_cmd); |
3154 | ||
1d4b027a DG |
3155 | ret = lttcomm_listen_unix_sock(client_sock); |
3156 | if (ret < 0) { | |
35df2755 | 3157 | goto error_listen; |
1d4b027a DG |
3158 | } |
3159 | ||
5eb91c98 DG |
3160 | /* |
3161 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3162 | * more will be added to this poll set. | |
3163 | */ | |
3164 | ret = create_thread_poll_set(&events, 2); | |
3165 | if (ret < 0) { | |
35df2755 | 3166 | goto error_create_poll; |
5eb91c98 | 3167 | } |
273ea72c | 3168 | |
5eb91c98 DG |
3169 | /* Add the application registration socket */ |
3170 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3171 | if (ret < 0) { | |
3172 | goto error; | |
3173 | } | |
273ea72c | 3174 | |
bbd973c2 DG |
3175 | /* |
3176 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3177 | */ |
3178 | if (opt_sig_parent) { | |
8db8d1dc | 3179 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3180 | } |
3181 | ||
6993eeb3 CB |
3182 | if (testpoint(thread_manage_clients_before_loop)) { |
3183 | goto error; | |
3184 | } | |
8ac94142 | 3185 | |
44a5e5eb DG |
3186 | health_code_update(&health_thread_cmd); |
3187 | ||
1d4b027a | 3188 | while (1) { |
1d4b027a | 3189 | DBG("Accepting client command ..."); |
273ea72c DG |
3190 | |
3191 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3192 | restart: |
44a5e5eb | 3193 | health_poll_update(&health_thread_cmd); |
5eb91c98 | 3194 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 3195 | health_poll_update(&health_thread_cmd); |
273ea72c | 3196 | if (ret < 0) { |
88f2b785 MD |
3197 | /* |
3198 | * Restart interrupted system call. | |
3199 | */ | |
3200 | if (errno == EINTR) { | |
3201 | goto restart; | |
3202 | } | |
273ea72c DG |
3203 | goto error; |
3204 | } | |
3205 | ||
0d9c5d77 DG |
3206 | nb_fd = ret; |
3207 | ||
5eb91c98 DG |
3208 | for (i = 0; i < nb_fd; i++) { |
3209 | /* Fetch once the poll data */ | |
3210 | revents = LTTNG_POLL_GETEV(&events, i); | |
3211 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3212 | ||
44a5e5eb DG |
3213 | health_code_update(&health_thread_cmd); |
3214 | ||
5eb91c98 DG |
3215 | /* Thread quit pipe has been closed. Killing thread. */ |
3216 | ret = check_thread_quit_pipe(pollfd, revents); | |
3217 | if (ret) { | |
139ac872 MD |
3218 | err = 0; |
3219 | goto exit; | |
5eb91c98 DG |
3220 | } |
3221 | ||
3222 | /* Event on the registration socket */ | |
3223 | if (pollfd == client_sock) { | |
3224 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3225 | ERR("Client socket poll error"); | |
3226 | goto error; | |
3227 | } | |
3228 | } | |
3229 | } | |
3230 | ||
3231 | DBG("Wait for client response"); | |
3232 | ||
44a5e5eb DG |
3233 | health_code_update(&health_thread_cmd); |
3234 | ||
5eb91c98 DG |
3235 | sock = lttcomm_accept_unix_sock(client_sock); |
3236 | if (sock < 0) { | |
273ea72c | 3237 | goto error; |
273ea72c DG |
3238 | } |
3239 | ||
b662582b DG |
3240 | /* |
3241 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3242 | * show must go on. | |
3243 | */ | |
3244 | (void) utils_set_fd_cloexec(sock); | |
3245 | ||
be040666 DG |
3246 | /* Set socket option for credentials retrieval */ |
3247 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3248 | if (ret < 0) { | |
3249 | goto error; | |
3250 | } | |
3251 | ||
5eb91c98 | 3252 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3253 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3254 | if (cmd_ctx == NULL) { |
76d7553f | 3255 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3256 | goto error; |
5eb91c98 | 3257 | } |
1d4b027a | 3258 | |
5eb91c98 | 3259 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3260 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3261 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3262 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3263 | goto error; |
3264 | } | |
1d4b027a | 3265 | |
5eb91c98 DG |
3266 | cmd_ctx->llm = NULL; |
3267 | cmd_ctx->session = NULL; | |
1d4b027a | 3268 | |
44a5e5eb DG |
3269 | health_code_update(&health_thread_cmd); |
3270 | ||
5eb91c98 DG |
3271 | /* |
3272 | * Data is received from the lttng client. The struct | |
3273 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3274 | * the client. | |
3275 | */ | |
3276 | DBG("Receiving data from client ..."); | |
be040666 DG |
3277 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3278 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3279 | if (ret <= 0) { |
3280 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3281 | ret = close(sock); |
3282 | if (ret) { | |
3283 | PERROR("close"); | |
3284 | } | |
3285 | sock = -1; | |
a2c0da86 | 3286 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3287 | continue; |
3288 | } | |
1d4b027a | 3289 | |
44a5e5eb DG |
3290 | health_code_update(&health_thread_cmd); |
3291 | ||
5eb91c98 DG |
3292 | // TODO: Validate cmd_ctx including sanity check for |
3293 | // security purpose. | |
f7776ea7 | 3294 | |
f6a9efaa | 3295 | rcu_thread_online(); |
5eb91c98 DG |
3296 | /* |
3297 | * This function dispatch the work to the kernel or userspace tracer | |
3298 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3299 | * informations for the client. The command context struct contains | |
3300 | * everything this function may needs. | |
3301 | */ | |
53a80697 | 3302 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3303 | rcu_thread_offline(); |
5eb91c98 | 3304 | if (ret < 0) { |
53a80697 MD |
3305 | if (sock_error) { |
3306 | ret = close(sock); | |
3307 | if (ret) { | |
3308 | PERROR("close"); | |
3309 | } | |
3310 | sock = -1; | |
3311 | } | |
bbd973c2 | 3312 | /* |
5eb91c98 | 3313 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3314 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3315 | * (ENOMEM). Error detected but still accept |
3316 | * command, unless a socket error has been | |
3317 | * detected. | |
bbd973c2 | 3318 | */ |
bbd973c2 | 3319 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3320 | continue; |
3321 | } | |
d6e4fca4 | 3322 | |
44a5e5eb DG |
3323 | health_code_update(&health_thread_cmd); |
3324 | ||
54d01ffb DG |
3325 | DBG("Sending response (size: %d, retcode: %s)", |
3326 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3327 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3328 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3329 | if (ret < 0) { |
3330 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3331 | } |
1d4b027a | 3332 | |
5eb91c98 | 3333 | /* End of transmission */ |
76d7553f MD |
3334 | ret = close(sock); |
3335 | if (ret) { | |
3336 | PERROR("close"); | |
3337 | } | |
3338 | sock = -1; | |
be040666 DG |
3339 | |
3340 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb DG |
3341 | |
3342 | health_code_update(&health_thread_cmd); | |
273ea72c DG |
3343 | } |
3344 | ||
139ac872 | 3345 | exit: |
5eb91c98 | 3346 | error: |
35df2755 CB |
3347 | if (sock >= 0) { |
3348 | ret = close(sock); | |
3349 | if (ret) { | |
3350 | PERROR("close"); | |
3351 | } | |
139ac872 | 3352 | } |
44a5e5eb | 3353 | |
35df2755 CB |
3354 | lttng_poll_clean(&events); |
3355 | clean_command_ctx(&cmd_ctx); | |
3356 | ||
3357 | error_listen: | |
3358 | error_create_poll: | |
6993eeb3 | 3359 | error_testpoint: |
273ea72c | 3360 | unlink(client_unix_sock_path); |
76d7553f MD |
3361 | if (client_sock >= 0) { |
3362 | ret = close(client_sock); | |
3363 | if (ret) { | |
3364 | PERROR("close"); | |
3365 | } | |
a4b35e07 | 3366 | } |
35df2755 CB |
3367 | |
3368 | if (err) { | |
3369 | health_error(&health_thread_cmd); | |
3370 | ERR("Health error occurred in %s", __func__); | |
a4b35e07 | 3371 | } |
273ea72c | 3372 | |
35df2755 CB |
3373 | health_exit(&health_thread_cmd); |
3374 | ||
3375 | DBG("Client thread dying"); | |
f6a9efaa DG |
3376 | |
3377 | rcu_unregister_thread(); | |
1d4b027a DG |
3378 | return NULL; |
3379 | } | |
3380 | ||
3381 | ||
fac6795d DG |
3382 | /* |
3383 | * usage function on stderr | |
3384 | */ | |
3385 | static void usage(void) | |
3386 | { | |
b716ce68 | 3387 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3388 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3389 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3390 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3391 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3392 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3393 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3394 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3395 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3396 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3397 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3398 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3399 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3400 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3401 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3402 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3403 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3404 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3405 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3406 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3407 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3408 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3409 | } |
3410 | ||
3411 | /* | |
3412 | * daemon argument parsing | |
3413 | */ | |
3414 | static int parse_args(int argc, char **argv) | |
3415 | { | |
3416 | int c; | |
3417 | ||
3418 | static struct option long_options[] = { | |
3419 | { "client-sock", 1, 0, 'c' }, | |
3420 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3421 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3422 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3423 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3424 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3425 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3426 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3427 | { "consumerd32-path", 1, 0, 'u' }, | |
3428 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3429 | { "consumerd64-path", 1, 0, 't' }, | |
3430 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3431 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3432 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3433 | { "help", 0, 0, 'h' }, |
3434 | { "group", 1, 0, 'g' }, | |
3435 | { "version", 0, 0, 'V' }, | |
75462a81 | 3436 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3437 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3438 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3439 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3440 | { NULL, 0, 0, 0 } |
3441 | }; | |
3442 | ||
3443 | while (1) { | |
3444 | int option_index = 0; | |
4fba7219 | 3445 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3446 | long_options, &option_index); |
fac6795d DG |
3447 | if (c == -1) { |
3448 | break; | |
3449 | } | |
3450 | ||
3451 | switch (c) { | |
3452 | case 0: | |
3453 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3454 | if (optarg) { | |
3455 | fprintf(stderr, " with arg %s\n", optarg); | |
3456 | } | |
3457 | break; | |
b716ce68 | 3458 | case 'c': |
fac6795d DG |
3459 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3460 | break; | |
3461 | case 'a': | |
3462 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3463 | break; | |
3464 | case 'd': | |
3465 | opt_daemon = 1; | |
3466 | break; | |
3467 | case 'g': | |
fb09408a | 3468 | opt_tracing_group = optarg; |
fac6795d DG |
3469 | break; |
3470 | case 'h': | |
3471 | usage(); | |
3472 | exit(EXIT_FAILURE); | |
3473 | case 'V': | |
3474 | fprintf(stdout, "%s\n", VERSION); | |
3475 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3476 | case 'S': |
3477 | opt_sig_parent = 1; | |
3478 | break; | |
d6f42150 | 3479 | case 'E': |
3bd1e081 | 3480 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3481 | break; |
3482 | case 'C': | |
3bd1e081 MD |
3483 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3484 | break; | |
3485 | case 'F': | |
7753dea8 | 3486 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3487 | break; |
3488 | case 'D': | |
7753dea8 MD |
3489 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3490 | break; | |
3491 | case 'H': | |
3492 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3493 | break; | |
3494 | case 'G': | |
3495 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3496 | break; |
4fba7219 DG |
3497 | case 'N': |
3498 | opt_no_kernel = 1; | |
3499 | break; | |
75462a81 | 3500 | case 'q': |
97e19046 | 3501 | lttng_opt_quiet = 1; |
75462a81 | 3502 | break; |
3f9947db | 3503 | case 'v': |
53086306 | 3504 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3505 | lttng_opt_verbose += 1; |
3f9947db | 3506 | break; |
31f73cc9 | 3507 | case 'Z': |
3bd1e081 | 3508 | opt_verbose_consumer += 1; |
31f73cc9 | 3509 | break; |
fb09408a | 3510 | case 'u': |
fc7a59ce | 3511 | consumerd32_bin= optarg; |
ebaeda94 MD |
3512 | break; |
3513 | case 'U': | |
3514 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3515 | break; |
3516 | case 't': | |
fc7a59ce | 3517 | consumerd64_bin = optarg; |
ebaeda94 MD |
3518 | break; |
3519 | case 'T': | |
3520 | consumerd64_libdir = optarg; | |
fb09408a | 3521 | break; |
fac6795d DG |
3522 | default: |
3523 | /* Unknown option or other error. | |
3524 | * Error is printed by getopt, just return */ | |
3525 | return -1; | |
3526 | } | |
3527 | } | |
3528 | ||
3529 | return 0; | |
3530 | } | |
3531 | ||
3532 | /* | |
d063d709 | 3533 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3534 | * apps_sock - The communication socket for all UST apps. |
3535 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3536 | */ |
cf3af59e | 3537 | static int init_daemon_socket(void) |
fac6795d DG |
3538 | { |
3539 | int ret = 0; | |
3540 | mode_t old_umask; | |
3541 | ||
3542 | old_umask = umask(0); | |
3543 | ||
3544 | /* Create client tool unix socket */ | |
d6f42150 DG |
3545 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3546 | if (client_sock < 0) { | |
3547 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3548 | ret = -1; |
3549 | goto end; | |
3550 | } | |
3551 | ||
b662582b DG |
3552 | /* Set the cloexec flag */ |
3553 | ret = utils_set_fd_cloexec(client_sock); | |
3554 | if (ret < 0) { | |
3555 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3556 | "Continuing but note that the consumer daemon will have a " | |
3557 | "reference to this socket on exec()", client_sock); | |
3558 | } | |
3559 | ||
fac6795d DG |
3560 | /* File permission MUST be 660 */ |
3561 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3562 | if (ret < 0) { | |
d6f42150 | 3563 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 3564 | PERROR("chmod"); |
fac6795d DG |
3565 | goto end; |
3566 | } | |
3567 | ||
3568 | /* Create the application unix socket */ | |
d6f42150 DG |
3569 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3570 | if (apps_sock < 0) { | |
3571 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3572 | ret = -1; |
3573 | goto end; | |
3574 | } | |
3575 | ||
b662582b DG |
3576 | /* Set the cloexec flag */ |
3577 | ret = utils_set_fd_cloexec(apps_sock); | |
3578 | if (ret < 0) { | |
3579 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
3580 | "Continuing but note that the consumer daemon will have a " | |
3581 | "reference to this socket on exec()", apps_sock); | |
3582 | } | |
3583 | ||
d6f42150 | 3584 | /* File permission MUST be 666 */ |
54d01ffb DG |
3585 | ret = chmod(apps_unix_sock_path, |
3586 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3587 | if (ret < 0) { |
d6f42150 | 3588 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 3589 | PERROR("chmod"); |
fac6795d DG |
3590 | goto end; |
3591 | } | |
3592 | ||
b662582b DG |
3593 | DBG3("Session daemon client socket %d and application socket %d created", |
3594 | client_sock, apps_sock); | |
3595 | ||
fac6795d DG |
3596 | end: |
3597 | umask(old_umask); | |
3598 | return ret; | |
3599 | } | |
3600 | ||
3601 | /* | |
54d01ffb DG |
3602 | * Check if the global socket is available, and if a daemon is answering at the |
3603 | * other side. If yes, error is returned. | |
fac6795d | 3604 | */ |
cf3af59e | 3605 | static int check_existing_daemon(void) |
fac6795d | 3606 | { |
7d8234d9 | 3607 | /* Is there anybody out there ? */ |
099e26bd | 3608 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3609 | return -EEXIST; |
099e26bd | 3610 | } |
b09c7c76 DG |
3611 | |
3612 | return 0; | |
fac6795d DG |
3613 | } |
3614 | ||
fac6795d | 3615 | /* |
d063d709 | 3616 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3617 | * |
d063d709 | 3618 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3619 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3620 | */ |
be040666 | 3621 | static int set_permissions(char *rundir) |
fac6795d DG |
3622 | { |
3623 | int ret; | |
996b65c8 | 3624 | gid_t gid; |
fac6795d | 3625 | |
6775595e DG |
3626 | ret = allowed_group(); |
3627 | if (ret < 0) { | |
be040666 DG |
3628 | WARN("No tracing group detected"); |
3629 | ret = 0; | |
fac6795d DG |
3630 | goto end; |
3631 | } | |
3632 | ||
6775595e DG |
3633 | gid = ret; |
3634 | ||
d6f42150 | 3635 | /* Set lttng run dir */ |
be040666 | 3636 | ret = chown(rundir, 0, gid); |
d6f42150 | 3637 | if (ret < 0) { |
be040666 | 3638 | ERR("Unable to set group on %s", rundir); |
76d7553f | 3639 | PERROR("chown"); |
d6f42150 DG |
3640 | } |
3641 | ||
d1613cf5 | 3642 | /* Ensure tracing group can search the run dir */ |
61076f74 | 3643 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
3644 | if (ret < 0) { |
3645 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 3646 | PERROR("chmod"); |
d1613cf5 JN |
3647 | } |
3648 | ||
d6f42150 | 3649 | /* lttng client socket path */ |
996b65c8 | 3650 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3651 | if (ret < 0) { |
d6f42150 | 3652 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 3653 | PERROR("chown"); |
d6f42150 DG |
3654 | } |
3655 | ||
3bd1e081 MD |
3656 | /* kconsumer error socket path */ |
3657 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3658 | if (ret < 0) { |
3bd1e081 | 3659 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 3660 | PERROR("chown"); |
3bd1e081 MD |
3661 | } |
3662 | ||
7753dea8 MD |
3663 | /* 64-bit ustconsumer error socket path */ |
3664 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3665 | if (ret < 0) { | |
3666 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 3667 | PERROR("chown"); |
7753dea8 MD |
3668 | } |
3669 | ||
3670 | /* 32-bit ustconsumer compat32 error socket path */ | |
3671 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3672 | if (ret < 0) { |
7753dea8 | 3673 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 3674 | PERROR("chown"); |
fac6795d DG |
3675 | } |
3676 | ||
d6f42150 | 3677 | DBG("All permissions are set"); |
e07ae692 | 3678 | |
fac6795d DG |
3679 | end: |
3680 | return ret; | |
3681 | } | |
3682 | ||
d6f42150 | 3683 | /* |
d063d709 | 3684 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 3685 | */ |
67e40797 | 3686 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
3687 | { |
3688 | int ret; | |
3689 | ||
67e40797 DG |
3690 | DBG3("Creating LTTng run directory: %s", rundir); |
3691 | ||
d1613cf5 | 3692 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 3693 | if (ret < 0) { |
b1f11e69 | 3694 | if (errno != EEXIST) { |
67e40797 | 3695 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
3696 | goto error; |
3697 | } else { | |
3698 | ret = 0; | |
3699 | } | |
d6f42150 DG |
3700 | } |
3701 | ||
3702 | error: | |
3703 | return ret; | |
3704 | } | |
3705 | ||
3706 | /* | |
d063d709 DG |
3707 | * Setup sockets and directory needed by the kconsumerd communication with the |
3708 | * session daemon. | |
d6f42150 | 3709 | */ |
67e40797 DG |
3710 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
3711 | const char *rundir) | |
d6f42150 DG |
3712 | { |
3713 | int ret; | |
67e40797 | 3714 | char path[PATH_MAX]; |
d6f42150 | 3715 | |
67e40797 | 3716 | switch (consumer_data->type) { |
7753dea8 | 3717 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 3718 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
3719 | break; |
3720 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 3721 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
3722 | break; |
3723 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 3724 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
3725 | break; |
3726 | default: | |
3727 | ERR("Consumer type unknown"); | |
3728 | ret = -EINVAL; | |
3729 | goto error; | |
d6f42150 DG |
3730 | } |
3731 | ||
67e40797 DG |
3732 | DBG2("Creating consumer directory: %s", path); |
3733 | ||
d1613cf5 | 3734 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 3735 | if (ret < 0) { |
6beb2242 | 3736 | if (errno != EEXIST) { |
f11e84c2 | 3737 | PERROR("mkdir"); |
3bd1e081 | 3738 | ERR("Failed to create %s", path); |
6beb2242 DG |
3739 | goto error; |
3740 | } | |
f11e84c2 | 3741 | ret = -1; |
d6f42150 DG |
3742 | } |
3743 | ||
3744 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3745 | consumer_data->err_sock = |
3746 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3747 | if (consumer_data->err_sock < 0) { | |
3748 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3749 | ret = -1; |
3750 | goto error; | |
3751 | } | |
3752 | ||
3753 | /* File permission MUST be 660 */ | |
3bd1e081 | 3754 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3755 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3756 | if (ret < 0) { |
3bd1e081 | 3757 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 3758 | PERROR("chmod"); |
d6f42150 DG |
3759 | goto error; |
3760 | } | |
3761 | ||
3762 | error: | |
3763 | return ret; | |
3764 | } | |
3765 | ||
fac6795d | 3766 | /* |
d063d709 | 3767 | * Signal handler for the daemon |
cf3af59e | 3768 | * |
54d01ffb DG |
3769 | * Simply stop all worker threads, leaving main() return gracefully after |
3770 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3771 | */ |
3772 | static void sighandler(int sig) | |
3773 | { | |
3774 | switch (sig) { | |
cf3af59e | 3775 | case SIGPIPE: |
af87c45a | 3776 | DBG("SIGPIPE caught"); |
cf3af59e MD |
3777 | return; |
3778 | case SIGINT: | |
af87c45a | 3779 | DBG("SIGINT caught"); |
cf3af59e MD |
3780 | stop_threads(); |
3781 | break; | |
3782 | case SIGTERM: | |
af87c45a | 3783 | DBG("SIGTERM caught"); |
cf3af59e MD |
3784 | stop_threads(); |
3785 | break; | |
3786 | default: | |
3787 | break; | |
fac6795d | 3788 | } |
fac6795d DG |
3789 | } |
3790 | ||
3791 | /* | |
d063d709 | 3792 | * Setup signal handler for : |
1d4b027a | 3793 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3794 | */ |
1d4b027a | 3795 | static int set_signal_handler(void) |
fac6795d | 3796 | { |
1d4b027a DG |
3797 | int ret = 0; |
3798 | struct sigaction sa; | |
3799 | sigset_t sigset; | |
fac6795d | 3800 | |
1d4b027a | 3801 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 3802 | PERROR("sigemptyset"); |
1d4b027a DG |
3803 | return ret; |
3804 | } | |
d6f42150 | 3805 | |
1d4b027a DG |
3806 | sa.sa_handler = sighandler; |
3807 | sa.sa_mask = sigset; | |
3808 | sa.sa_flags = 0; | |
3809 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 3810 | PERROR("sigaction"); |
1d4b027a | 3811 | return ret; |
d6f42150 DG |
3812 | } |
3813 | ||
1d4b027a | 3814 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 3815 | PERROR("sigaction"); |
1d4b027a | 3816 | return ret; |
d6f42150 | 3817 | } |
aaf26714 | 3818 | |
1d4b027a | 3819 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 3820 | PERROR("sigaction"); |
1d4b027a | 3821 | return ret; |
8c0faa1d DG |
3822 | } |
3823 | ||
1d4b027a DG |
3824 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3825 | ||
3826 | return ret; | |
fac6795d DG |
3827 | } |
3828 | ||
f3ed775e | 3829 | /* |
d063d709 DG |
3830 | * Set open files limit to unlimited. This daemon can open a large number of |
3831 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3832 | */ |
3833 | static void set_ulimit(void) | |
3834 | { | |
3835 | int ret; | |
3836 | struct rlimit lim; | |
3837 | ||
a88df331 | 3838 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3839 | lim.rlim_cur = 65535; |
3840 | lim.rlim_max = 65535; | |
3841 | ||
3842 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3843 | if (ret < 0) { | |
76d7553f | 3844 | PERROR("failed to set open files limit"); |
f3ed775e DG |
3845 | } |
3846 | } | |
3847 | ||
fac6795d DG |
3848 | /* |
3849 | * main | |
3850 | */ | |
3851 | int main(int argc, char **argv) | |
3852 | { | |
fac6795d DG |
3853 | int ret = 0; |
3854 | void *status; | |
ae9e45b3 | 3855 | const char *home_path, *env_app_timeout; |
fac6795d | 3856 | |
335a95b7 MD |
3857 | init_kernel_workarounds(); |
3858 | ||
f6a9efaa DG |
3859 | rcu_register_thread(); |
3860 | ||
7753dea8 | 3861 | setup_consumerd_path(); |
fb09408a | 3862 | |
fac6795d DG |
3863 | /* Parse arguments */ |
3864 | progname = argv[0]; | |
c617c0c6 | 3865 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 3866 | goto error; |
fac6795d DG |
3867 | } |
3868 | ||
3869 | /* Daemonize */ | |
3870 | if (opt_daemon) { | |
ceed52b5 MD |
3871 | int i; |
3872 | ||
3873 | /* | |
3874 | * fork | |
3875 | * child: setsid, close FD 0, 1, 2, chdir / | |
3876 | * parent: exit (if fork is successful) | |
3877 | */ | |
53094c05 DG |
3878 | ret = daemon(0, 0); |
3879 | if (ret < 0) { | |
76d7553f | 3880 | PERROR("daemon"); |
cf3af59e | 3881 | goto error; |
53094c05 | 3882 | } |
ceed52b5 MD |
3883 | /* |
3884 | * We are in the child. Make sure all other file | |
3885 | * descriptors are closed, in case we are called with | |
3886 | * more opened file descriptors than the standard ones. | |
3887 | */ | |
3888 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
3889 | (void) close(i); | |
3890 | } | |
3891 | } | |
3892 | ||
3893 | /* Create thread quit pipe */ | |
3894 | if ((ret = init_thread_quit_pipe()) < 0) { | |
3895 | goto error; | |
fac6795d DG |
3896 | } |
3897 | ||
3898 | /* Check if daemon is UID = 0 */ | |
3899 | is_root = !getuid(); | |
3900 | ||
fac6795d | 3901 | if (is_root) { |
990570ed | 3902 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
3903 | |
3904 | /* Create global run dir with root access */ | |
3905 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 3906 | if (ret < 0) { |
cf3af59e | 3907 | goto error; |
d6f42150 DG |
3908 | } |
3909 | ||
fac6795d | 3910 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3911 | snprintf(apps_unix_sock_path, PATH_MAX, |
3912 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3913 | } |
3914 | ||
3915 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3916 | snprintf(client_unix_sock_path, PATH_MAX, |
3917 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3918 | } | |
0fdd1e2c DG |
3919 | |
3920 | /* Set global SHM for ust */ | |
3921 | if (strlen(wait_shm_path) == 0) { | |
3922 | snprintf(wait_shm_path, PATH_MAX, | |
3923 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3924 | } | |
67e40797 | 3925 | |
44a5e5eb DG |
3926 | if (strlen(health_unix_sock_path) == 0) { |
3927 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3928 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
3929 | } | |
3930 | ||
67e40797 DG |
3931 | /* Setup kernel consumerd path */ |
3932 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3933 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 3934 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3935 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3936 | |
3937 | DBG2("Kernel consumer err path: %s", | |
3938 | kconsumer_data.err_unix_sock_path); | |
3939 | DBG2("Kernel consumer cmd path: %s", | |
3940 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 3941 | } else { |
b082db07 DG |
3942 | home_path = get_home_dir(); |
3943 | if (home_path == NULL) { | |
273ea72c DG |
3944 | /* TODO: Add --socket PATH option */ |
3945 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3946 | ret = -EPERM; |
3947 | goto error; | |
b082db07 DG |
3948 | } |
3949 | ||
67e40797 DG |
3950 | /* |
3951 | * Create rundir from home path. This will create something like | |
3952 | * $HOME/.lttng | |
3953 | */ | |
990570ed | 3954 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
3955 | if (ret < 0) { |
3956 | ret = -ENOMEM; | |
3957 | goto error; | |
3958 | } | |
3959 | ||
3960 | ret = create_lttng_rundir(rundir); | |
3961 | if (ret < 0) { | |
3962 | goto error; | |
3963 | } | |
3964 | ||
fac6795d | 3965 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3966 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3967 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3968 | } |
3969 | ||
3970 | /* Set the cli tool unix socket path */ | |
3971 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3972 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3973 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 3974 | } |
0fdd1e2c DG |
3975 | |
3976 | /* Set global SHM for ust */ | |
3977 | if (strlen(wait_shm_path) == 0) { | |
3978 | snprintf(wait_shm_path, PATH_MAX, | |
3979 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
3980 | } | |
44a5e5eb DG |
3981 | |
3982 | /* Set health check Unix path */ | |
3983 | if (strlen(health_unix_sock_path) == 0) { | |
3984 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3985 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
3986 | } | |
fac6795d DG |
3987 | } |
3988 | ||
5c827ce0 DG |
3989 | /* Set consumer initial state */ |
3990 | kernel_consumerd_state = CONSUMER_STOPPED; | |
3991 | ust_consumerd_state = CONSUMER_STOPPED; | |
3992 | ||
847177cd DG |
3993 | DBG("Client socket path %s", client_unix_sock_path); |
3994 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
3995 | DBG("LTTng run directory path: %s", rundir); |
3996 | ||
3997 | /* 32 bits consumerd path setup */ | |
3998 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3999 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4000 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4001 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4002 | |
4003 | DBG2("UST consumer 32 bits err path: %s", | |
4004 | ustconsumer32_data.err_unix_sock_path); | |
4005 | DBG2("UST consumer 32 bits cmd path: %s", | |
4006 | ustconsumer32_data.cmd_unix_sock_path); | |
4007 | ||
4008 | /* 64 bits consumerd path setup */ | |
4009 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4010 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4011 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4012 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4013 | |
4014 | DBG2("UST consumer 64 bits err path: %s", | |
4015 | ustconsumer64_data.err_unix_sock_path); | |
4016 | DBG2("UST consumer 64 bits cmd path: %s", | |
4017 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4018 | |
273ea72c | 4019 | /* |
7d8234d9 | 4020 | * See if daemon already exist. |
fac6795d | 4021 | */ |
7d8234d9 | 4022 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4023 | ERR("Already running daemon.\n"); |
273ea72c | 4024 | /* |
cf3af59e MD |
4025 | * We do not goto exit because we must not cleanup() |
4026 | * because a daemon is already running. | |
ab118b20 | 4027 | */ |
cf3af59e | 4028 | goto error; |
a88df331 DG |
4029 | } |
4030 | ||
1427f9b2 DG |
4031 | /* |
4032 | * Init UST app hash table. Alloc hash table before this point since | |
4033 | * cleanup() can get called after that point. | |
4034 | */ | |
4035 | ust_app_ht_alloc(); | |
4036 | ||
54d01ffb | 4037 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4038 | |
4039 | /* | |
4040 | * These actions must be executed as root. We do that *after* setting up | |
4041 | * the sockets path because we MUST make the check for another daemon using | |
4042 | * those paths *before* trying to set the kernel consumer sockets and init | |
4043 | * kernel tracer. | |
4044 | */ | |
4045 | if (is_root) { | |
67e40797 | 4046 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4047 | if (ret < 0) { |
4048 | goto exit; | |
4049 | } | |
4050 | ||
a88df331 | 4051 | /* Setup kernel tracer */ |
4fba7219 DG |
4052 | if (!opt_no_kernel) { |
4053 | init_kernel_tracer(); | |
4054 | } | |
a88df331 DG |
4055 | |
4056 | /* Set ulimit for open files */ | |
4057 | set_ulimit(); | |
fac6795d | 4058 | } |
4063050c MD |
4059 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4060 | lttng_fd_init(); | |
fac6795d | 4061 | |
67e40797 DG |
4062 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4063 | if (ret < 0) { | |
4064 | goto exit; | |
4065 | } | |
4066 | ||
4067 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4068 | if (ret < 0) { | |
4069 | goto exit; | |
4070 | } | |
4071 | ||
cf3af59e MD |
4072 | if ((ret = set_signal_handler()) < 0) { |
4073 | goto exit; | |
fac6795d DG |
4074 | } |
4075 | ||
d6f42150 | 4076 | /* Setup the needed unix socket */ |
cf3af59e MD |
4077 | if ((ret = init_daemon_socket()) < 0) { |
4078 | goto exit; | |
fac6795d DG |
4079 | } |
4080 | ||
4081 | /* Set credentials to socket */ | |
be040666 | 4082 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4083 | goto exit; |
fac6795d DG |
4084 | } |
4085 | ||
5b8719f5 DG |
4086 | /* Get parent pid if -S, --sig-parent is specified. */ |
4087 | if (opt_sig_parent) { | |
4088 | ppid = getppid(); | |
4089 | } | |
4090 | ||
7a485870 | 4091 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4092 | if (is_root && !opt_no_kernel) { |
4093 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4094 | goto exit; | |
4095 | } | |
7a485870 DG |
4096 | } |
4097 | ||
099e26bd | 4098 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4099 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4100 | goto exit; |
4101 | } | |
4102 | ||
4103 | /* Init UST command queue. */ | |
4104 | cds_wfq_init(&ust_cmd_queue.queue); | |
4105 | ||
273ea72c | 4106 | /* |
54d01ffb DG |
4107 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4108 | * statically declared in session.c | |
273ea72c | 4109 | */ |
54d01ffb | 4110 | session_list_ptr = session_get_list(); |
b5541356 | 4111 | |
5eb91c98 DG |
4112 | /* Set up max poll set size */ |
4113 | lttng_poll_set_max_size(); | |
4114 | ||
2f77fc4b | 4115 | cmd_init(); |
00e2e675 | 4116 | |
44a5e5eb DG |
4117 | /* Init all health thread counters. */ |
4118 | health_init(&health_thread_cmd); | |
4119 | health_init(&health_thread_kernel); | |
139ac872 | 4120 | health_init(&health_thread_app_manage); |
44a5e5eb DG |
4121 | health_init(&health_thread_app_reg); |
4122 | ||
4123 | /* | |
4124 | * Init health counters of the consumer thread. We do a quick hack here to | |
4125 | * the state of the consumer health is fine even if the thread is not | |
9449cc75 DG |
4126 | * started. Once the thread starts, the health state is updated with a poll |
4127 | * value to set a health code path. This is simply to ease our life and has | |
4128 | * no cost what so ever. | |
44a5e5eb DG |
4129 | */ |
4130 | health_init(&kconsumer_data.health); | |
4131 | health_poll_update(&kconsumer_data.health); | |
4132 | health_init(&ustconsumer32_data.health); | |
4133 | health_poll_update(&ustconsumer32_data.health); | |
4134 | health_init(&ustconsumer64_data.health); | |
4135 | health_poll_update(&ustconsumer64_data.health); | |
4136 | ||
ae9e45b3 DG |
4137 | /* Check for the application socket timeout env variable. */ |
4138 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4139 | if (env_app_timeout) { | |
4140 | app_socket_timeout = atoi(env_app_timeout); | |
4141 | } else { | |
4142 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4143 | } | |
4144 | ||
44a5e5eb DG |
4145 | /* Create thread to manage the client socket */ |
4146 | ret = pthread_create(&health_thread, NULL, | |
4147 | thread_manage_health, (void *) NULL); | |
4148 | if (ret != 0) { | |
4149 | PERROR("pthread_create health"); | |
4150 | goto exit_health; | |
4151 | } | |
4152 | ||
cf3af59e | 4153 | /* Create thread to manage the client socket */ |
099e26bd DG |
4154 | ret = pthread_create(&client_thread, NULL, |
4155 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4156 | if (ret != 0) { |
76d7553f | 4157 | PERROR("pthread_create clients"); |
cf3af59e MD |
4158 | goto exit_client; |
4159 | } | |
fac6795d | 4160 | |
099e26bd DG |
4161 | /* Create thread to dispatch registration */ |
4162 | ret = pthread_create(&dispatch_thread, NULL, | |
4163 | thread_dispatch_ust_registration, (void *) NULL); | |
4164 | if (ret != 0) { | |
76d7553f | 4165 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4166 | goto exit_dispatch; |
4167 | } | |
4168 | ||
4169 | /* Create thread to manage application registration. */ | |
4170 | ret = pthread_create(®_apps_thread, NULL, | |
4171 | thread_registration_apps, (void *) NULL); | |
4172 | if (ret != 0) { | |
76d7553f | 4173 | PERROR("pthread_create registration"); |
099e26bd DG |
4174 | goto exit_reg_apps; |
4175 | } | |
4176 | ||
cf3af59e | 4177 | /* Create thread to manage application socket */ |
54d01ffb DG |
4178 | ret = pthread_create(&apps_thread, NULL, |
4179 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4180 | if (ret != 0) { |
76d7553f | 4181 | PERROR("pthread_create apps"); |
cf3af59e MD |
4182 | goto exit_apps; |
4183 | } | |
fac6795d | 4184 | |
6620da75 DG |
4185 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4186 | if (is_root && !opt_no_kernel) { | |
4187 | /* Create kernel thread to manage kernel event */ | |
4188 | ret = pthread_create(&kernel_thread, NULL, | |
4189 | thread_manage_kernel, (void *) NULL); | |
4190 | if (ret != 0) { | |
4191 | PERROR("pthread_create kernel"); | |
4192 | goto exit_kernel; | |
4193 | } | |
7a485870 | 4194 | |
6620da75 DG |
4195 | ret = pthread_join(kernel_thread, &status); |
4196 | if (ret != 0) { | |
4197 | PERROR("pthread_join"); | |
4198 | goto error; /* join error, exit without cleanup */ | |
4199 | } | |
fac6795d DG |
4200 | } |
4201 | ||
cf3af59e MD |
4202 | exit_kernel: |
4203 | ret = pthread_join(apps_thread, &status); | |
4204 | if (ret != 0) { | |
76d7553f | 4205 | PERROR("pthread_join"); |
cf3af59e MD |
4206 | goto error; /* join error, exit without cleanup */ |
4207 | } | |
fac6795d | 4208 | |
cf3af59e | 4209 | exit_apps: |
099e26bd DG |
4210 | ret = pthread_join(reg_apps_thread, &status); |
4211 | if (ret != 0) { | |
76d7553f | 4212 | PERROR("pthread_join"); |
099e26bd DG |
4213 | goto error; /* join error, exit without cleanup */ |
4214 | } | |
4215 | ||
4216 | exit_reg_apps: | |
4217 | ret = pthread_join(dispatch_thread, &status); | |
4218 | if (ret != 0) { | |
76d7553f | 4219 | PERROR("pthread_join"); |
099e26bd DG |
4220 | goto error; /* join error, exit without cleanup */ |
4221 | } | |
4222 | ||
4223 | exit_dispatch: | |
cf3af59e MD |
4224 | ret = pthread_join(client_thread, &status); |
4225 | if (ret != 0) { | |
76d7553f | 4226 | PERROR("pthread_join"); |
cf3af59e MD |
4227 | goto error; /* join error, exit without cleanup */ |
4228 | } | |
4229 | ||
3bd1e081 | 4230 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4231 | if (ret != 0) { |
76d7553f | 4232 | PERROR("join_consumer"); |
cf3af59e MD |
4233 | goto error; /* join error, exit without cleanup */ |
4234 | } | |
a88df331 | 4235 | |
06f525de DG |
4236 | ret = join_consumer_thread(&ustconsumer32_data); |
4237 | if (ret != 0) { | |
4238 | PERROR("join_consumer ust32"); | |
4239 | goto error; /* join error, exit without cleanup */ | |
4240 | } | |
4241 | ||
4242 | ret = join_consumer_thread(&ustconsumer64_data); | |
4243 | if (ret != 0) { | |
4244 | PERROR("join_consumer ust64"); | |
4245 | goto error; /* join error, exit without cleanup */ | |
4246 | } | |
4247 | ||
cf3af59e | 4248 | exit_client: |
06f525de DG |
4249 | ret = pthread_join(health_thread, &status); |
4250 | if (ret != 0) { | |
4251 | PERROR("pthread_join health thread"); | |
4252 | goto error; /* join error, exit without cleanup */ | |
4253 | } | |
4254 | ||
44a5e5eb | 4255 | exit_health: |
a88df331 | 4256 | exit: |
cf3af59e MD |
4257 | /* |
4258 | * cleanup() is called when no other thread is running. | |
4259 | */ | |
f6a9efaa | 4260 | rcu_thread_online(); |
cf3af59e | 4261 | cleanup(); |
f6a9efaa DG |
4262 | rcu_thread_offline(); |
4263 | rcu_unregister_thread(); | |
67e40797 | 4264 | if (!ret) { |
cf3af59e | 4265 | exit(EXIT_SUCCESS); |
67e40797 | 4266 | } |
cf3af59e | 4267 | error: |
5e16da05 | 4268 | exit(EXIT_FAILURE); |
fac6795d | 4269 | } |