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> | |
331744e3 | 28 | #include <inttypes.h> |
0fdd1e2c | 29 | #include <sys/mman.h> |
b73401da | 30 | #include <sys/mount.h> |
1e307fab | 31 | #include <sys/resource.h> |
fac6795d DG |
32 | #include <sys/socket.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
0fdd1e2c | 35 | #include <sys/wait.h> |
5c827ce0 | 36 | #include <urcu/uatomic.h> |
fac6795d | 37 | #include <unistd.h> |
3bd1e081 | 38 | #include <config.h> |
fac6795d | 39 | |
990570ed | 40 | #include <common/common.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" |
7972aab2 | 49 | #include "buffer-registry.h" |
54d01ffb | 50 | #include "channel.h" |
2f77fc4b | 51 | #include "cmd.h" |
00e2e675 | 52 | #include "consumer.h" |
099e26bd | 53 | #include "context.h" |
54d01ffb | 54 | #include "event.h" |
4771f025 | 55 | #include "kernel.h" |
f1e16794 | 56 | #include "kernel-consumer.h" |
096102bd | 57 | #include "modprobe.h" |
0fdd1e2c | 58 | #include "shm.h" |
1e307fab | 59 | #include "ust-ctl.h" |
00e2e675 | 60 | #include "ust-consumer.h" |
8e68d1c8 | 61 | #include "utils.h" |
4063050c | 62 | #include "fd-limit.h" |
8782cc74 | 63 | #include "health-sessiond.h" |
8ac94142 | 64 | #include "testpoint.h" |
d0b96690 | 65 | #include "ust-thread.h" |
fac6795d | 66 | |
ebaeda94 MD |
67 | #define CONSUMERD_FILE "lttng-consumerd" |
68 | ||
fac6795d | 69 | const char *progname; |
6c71277b | 70 | static const char *tracing_group_name = DEFAULT_TRACING_GROUP; |
35f90c40 | 71 | static const char *opt_pidfile; |
5b8719f5 | 72 | static int opt_sig_parent; |
97e19046 | 73 | static int opt_verbose_consumer; |
fac6795d | 74 | static int opt_daemon; |
4fba7219 | 75 | static int opt_no_kernel; |
fac6795d | 76 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 77 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 78 | static char *rundir; |
3bd1e081 | 79 | |
a23ec3a7 DG |
80 | /* |
81 | * Consumer daemon specific control data. Every value not initialized here is | |
82 | * set to 0 by the static definition. | |
83 | */ | |
3bd1e081 MD |
84 | static struct consumer_data kconsumer_data = { |
85 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
86 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
87 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
88 | .err_sock = -1, |
89 | .cmd_sock = -1, | |
173af62f DG |
90 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
91 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
92 | .cond = PTHREAD_COND_INITIALIZER, |
93 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 94 | }; |
7753dea8 MD |
95 | static struct consumer_data ustconsumer64_data = { |
96 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
97 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
98 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
99 | .err_sock = -1, |
100 | .cmd_sock = -1, | |
173af62f DG |
101 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
102 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
103 | .cond = PTHREAD_COND_INITIALIZER, |
104 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
105 | }; |
106 | static struct consumer_data ustconsumer32_data = { | |
107 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
108 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
109 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
110 | .err_sock = -1, |
111 | .cmd_sock = -1, | |
173af62f DG |
112 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
113 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
114 | .cond = PTHREAD_COND_INITIALIZER, |
115 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
116 | }; |
117 | ||
26c9d55e | 118 | /* Shared between threads */ |
099e26bd | 119 | static int dispatch_thread_exit; |
fac6795d | 120 | |
54d01ffb DG |
121 | /* Global application Unix socket path */ |
122 | static char apps_unix_sock_path[PATH_MAX]; | |
123 | /* Global client Unix socket path */ | |
124 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
125 | /* global wait shm path for UST */ |
126 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
127 | /* Global health check unix path */ |
128 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 129 | |
1d4b027a | 130 | /* Sockets and FDs */ |
a4b35e07 MD |
131 | static int client_sock = -1; |
132 | static int apps_sock = -1; | |
2f77fc4b | 133 | int kernel_tracer_fd = -1; |
76d7553f | 134 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 135 | |
273ea72c DG |
136 | /* |
137 | * Quit pipe for all threads. This permits a single cancellation point | |
138 | * for all threads when receiving an event on the pipe. | |
139 | */ | |
76d7553f | 140 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 141 | |
099e26bd DG |
142 | /* |
143 | * This pipe is used to inform the thread managing application communication | |
144 | * that a command is queued and ready to be processed. | |
145 | */ | |
76d7553f | 146 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 147 | |
d0b96690 DG |
148 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
149 | ||
1d4b027a | 150 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 151 | static pthread_t apps_thread; |
d0b96690 | 152 | static pthread_t apps_notify_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; |
0b2dc8df | 158 | static pthread_t ht_cleanup_thread; |
5eb91c98 | 159 | |
099e26bd DG |
160 | /* |
161 | * UST registration command queue. This queue is tied with a futex and uses a N | |
162 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
163 | * | |
164 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
165 | * this queue and the wait/wake scheme. | |
166 | */ | |
167 | static struct ust_cmd_queue ust_cmd_queue; | |
168 | ||
b5541356 DG |
169 | /* |
170 | * Pointer initialized before thread creation. | |
171 | * | |
172 | * This points to the tracing session list containing the session count and a | |
173 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
174 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 175 | * |
d063d709 | 176 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 177 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
178 | */ |
179 | static struct ltt_session_list *session_list_ptr; | |
180 | ||
7753dea8 MD |
181 | int ust_consumerd64_fd = -1; |
182 | int ust_consumerd32_fd = -1; | |
183 | ||
fb6f1fa2 YB |
184 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
185 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
186 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
187 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 188 | |
2f77fc4b DG |
189 | static const char *module_proc_lttng = "/proc/lttng"; |
190 | ||
5c827ce0 DG |
191 | /* |
192 | * Consumer daemon state which is changed when spawning it, killing it or in | |
193 | * case of a fatal error. | |
194 | */ | |
195 | enum consumerd_state { | |
196 | CONSUMER_STARTED = 1, | |
197 | CONSUMER_STOPPED = 2, | |
198 | CONSUMER_ERROR = 3, | |
199 | }; | |
200 | ||
201 | /* | |
202 | * This consumer daemon state is used to validate if a client command will be | |
203 | * able to reach the consumer. If not, the client is informed. For instance, | |
204 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
205 | * error to the client. | |
206 | * | |
207 | * The following example shows a possible race condition of this scheme: | |
208 | * | |
209 | * consumer thread error happens | |
210 | * client cmd arrives | |
211 | * client cmd checks state -> still OK | |
212 | * consumer thread exit, sets error | |
213 | * client cmd try to talk to consumer | |
214 | * ... | |
215 | * | |
216 | * However, since the consumer is a different daemon, we have no way of making | |
217 | * sure the command will reach it safely even with this state flag. This is why | |
218 | * we consider that up to the state validation during command processing, the | |
219 | * command is safe. After that, we can not guarantee the correctness of the | |
220 | * client request vis-a-vis the consumer. | |
221 | */ | |
222 | static enum consumerd_state ust_consumerd_state; | |
223 | static enum consumerd_state kernel_consumerd_state; | |
224 | ||
ae9e45b3 DG |
225 | /* |
226 | * Socket timeout for receiving and sending in seconds. | |
227 | */ | |
228 | static int app_socket_timeout; | |
229 | ||
12744796 DG |
230 | /* Set in main() with the current page size. */ |
231 | long page_size; | |
232 | ||
8782cc74 MD |
233 | /* Application health monitoring */ |
234 | struct health_app *health_sessiond; | |
235 | ||
fb09408a | 236 | static |
7753dea8 | 237 | void setup_consumerd_path(void) |
fb09408a | 238 | { |
fc7a59ce | 239 | const char *bin, *libdir; |
fb09408a | 240 | |
7753dea8 MD |
241 | /* |
242 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
243 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
244 | * has not been defined. | |
7753dea8 | 245 | */ |
ebaeda94 | 246 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
247 | if (!consumerd32_bin[0]) { |
248 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
249 | } |
250 | if (!consumerd32_libdir[0]) { | |
251 | consumerd32_libdir = INSTALL_LIB_PATH; | |
252 | } | |
253 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
254 | if (!consumerd64_bin[0]) { |
255 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 256 | } |
ebaeda94 MD |
257 | if (!consumerd64_libdir[0]) { |
258 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
259 | } |
260 | #else | |
261 | #error "Unknown bitness" | |
262 | #endif | |
263 | ||
fb09408a MD |
264 | /* |
265 | * runtime env. var. overrides the build default. | |
266 | */ | |
fc7a59ce AM |
267 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
268 | if (bin) { | |
269 | consumerd32_bin = bin; | |
7753dea8 | 270 | } |
fc7a59ce AM |
271 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
272 | if (bin) { | |
273 | consumerd64_bin = bin; | |
ebaeda94 | 274 | } |
72f579ee | 275 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
276 | if (libdir) { |
277 | consumerd32_libdir = libdir; | |
278 | } | |
72f579ee | 279 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
280 | if (libdir) { |
281 | consumerd64_libdir = libdir; | |
fb09408a MD |
282 | } |
283 | } | |
284 | ||
5eb91c98 DG |
285 | /* |
286 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
287 | */ | |
d0b96690 | 288 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) |
5eb91c98 DG |
289 | { |
290 | int ret; | |
291 | ||
d0b96690 | 292 | assert(events); |
5eb91c98 DG |
293 | |
294 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
295 | if (ret < 0) { | |
296 | goto error; | |
297 | } | |
298 | ||
299 | /* Add quit pipe */ | |
d0b96690 | 300 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
301 | if (ret < 0) { |
302 | goto error; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | ||
307 | error: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Check if the thread quit pipe was triggered. | |
313 | * | |
314 | * Return 1 if it was triggered else 0; | |
315 | */ | |
d0b96690 | 316 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
5eb91c98 DG |
317 | { |
318 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
319 | return 1; | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
273ea72c | 325 | /* |
5eb91c98 | 326 | * Init thread quit pipe. |
273ea72c DG |
327 | * |
328 | * Return -1 on error or 0 if all pipes are created. | |
329 | */ | |
330 | static int init_thread_quit_pipe(void) | |
331 | { | |
730389d9 | 332 | int ret, i; |
273ea72c | 333 | |
730389d9 | 334 | ret = pipe(thread_quit_pipe); |
273ea72c | 335 | if (ret < 0) { |
730389d9 | 336 | PERROR("thread quit pipe"); |
273ea72c DG |
337 | goto error; |
338 | } | |
339 | ||
730389d9 DG |
340 | for (i = 0; i < 2; i++) { |
341 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
342 | if (ret < 0) { | |
343 | PERROR("fcntl"); | |
344 | goto error; | |
345 | } | |
346 | } | |
347 | ||
273ea72c DG |
348 | error: |
349 | return ret; | |
350 | } | |
351 | ||
099e26bd DG |
352 | /* |
353 | * Stop all threads by closing the thread quit pipe. | |
354 | */ | |
cf3af59e MD |
355 | static void stop_threads(void) |
356 | { | |
5eb91c98 DG |
357 | int ret; |
358 | ||
cf3af59e MD |
359 | /* Stopping all threads */ |
360 | DBG("Terminating all threads"); | |
54d01ffb | 361 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
362 | if (ret < 0) { |
363 | ERR("write error on thread quit pipe"); | |
364 | } | |
365 | ||
099e26bd | 366 | /* Dispatch thread */ |
26c9d55e | 367 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 368 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
369 | } |
370 | ||
e975f9f8 DG |
371 | /* |
372 | * Close every consumer sockets. | |
373 | */ | |
374 | static void close_consumer_sockets(void) | |
375 | { | |
376 | int ret; | |
377 | ||
378 | if (kconsumer_data.err_sock >= 0) { | |
379 | ret = close(kconsumer_data.err_sock); | |
380 | if (ret < 0) { | |
381 | PERROR("kernel consumer err_sock close"); | |
382 | } | |
383 | } | |
384 | if (ustconsumer32_data.err_sock >= 0) { | |
385 | ret = close(ustconsumer32_data.err_sock); | |
386 | if (ret < 0) { | |
a76cbd9f | 387 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
388 | } |
389 | } | |
390 | if (ustconsumer64_data.err_sock >= 0) { | |
391 | ret = close(ustconsumer64_data.err_sock); | |
392 | if (ret < 0) { | |
a76cbd9f | 393 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
394 | } |
395 | } | |
396 | if (kconsumer_data.cmd_sock >= 0) { | |
397 | ret = close(kconsumer_data.cmd_sock); | |
398 | if (ret < 0) { | |
399 | PERROR("kernel consumer cmd_sock close"); | |
400 | } | |
401 | } | |
402 | if (ustconsumer32_data.cmd_sock >= 0) { | |
403 | ret = close(ustconsumer32_data.cmd_sock); | |
404 | if (ret < 0) { | |
a76cbd9f | 405 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
406 | } |
407 | } | |
408 | if (ustconsumer64_data.cmd_sock >= 0) { | |
409 | ret = close(ustconsumer64_data.cmd_sock); | |
410 | if (ret < 0) { | |
a76cbd9f | 411 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
412 | } |
413 | } | |
414 | } | |
415 | ||
fac6795d | 416 | /* |
d063d709 | 417 | * Cleanup the daemon |
fac6795d | 418 | */ |
cf3af59e | 419 | static void cleanup(void) |
fac6795d | 420 | { |
ef599319 | 421 | int ret; |
af9737e9 | 422 | struct ltt_session *sess, *stmp; |
8c6c56c2 | 423 | char path[PATH_MAX]; |
fac6795d | 424 | |
1d4b027a | 425 | DBG("Cleaning up"); |
e07ae692 | 426 | |
4e449f3f MD |
427 | /* |
428 | * Close the thread quit pipe. It has already done its job, | |
429 | * since we are now called. | |
430 | */ | |
2f77fc4b DG |
431 | utils_close_pipe(thread_quit_pipe); |
432 | ||
35f90c40 DG |
433 | /* |
434 | * If opt_pidfile is undefined, the default file will be wiped when | |
435 | * removing the rundir. | |
436 | */ | |
437 | if (opt_pidfile) { | |
438 | ret = remove(opt_pidfile); | |
439 | if (ret < 0) { | |
440 | PERROR("remove pidfile %s", opt_pidfile); | |
441 | } | |
442 | } | |
443 | ||
8c6c56c2 MD |
444 | DBG("Removing sessiond and consumerd content of directory %s", rundir); |
445 | ||
446 | /* sessiond */ | |
447 | snprintf(path, PATH_MAX, | |
448 | "%s/%s", | |
449 | rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE); | |
450 | DBG("Removing %s", path); | |
451 | (void) unlink(path); | |
452 | ||
453 | /* kconsumerd */ | |
454 | snprintf(path, PATH_MAX, | |
455 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, | |
456 | rundir); | |
457 | DBG("Removing %s", path); | |
458 | (void) unlink(path); | |
459 | ||
460 | snprintf(path, PATH_MAX, | |
461 | DEFAULT_KCONSUMERD_PATH, | |
462 | rundir); | |
463 | DBG("Removing directory %s", path); | |
464 | (void) rmdir(path); | |
465 | ||
466 | /* ust consumerd 32 */ | |
467 | snprintf(path, PATH_MAX, | |
468 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, | |
469 | rundir); | |
470 | DBG("Removing %s", path); | |
471 | (void) unlink(path); | |
472 | ||
473 | snprintf(path, PATH_MAX, | |
474 | DEFAULT_USTCONSUMERD32_PATH, | |
475 | rundir); | |
476 | DBG("Removing directory %s", path); | |
477 | (void) rmdir(path); | |
478 | ||
479 | /* ust consumerd 64 */ | |
480 | snprintf(path, PATH_MAX, | |
481 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, | |
482 | rundir); | |
483 | DBG("Removing %s", path); | |
484 | (void) unlink(path); | |
485 | ||
486 | snprintf(path, PATH_MAX, | |
487 | DEFAULT_USTCONSUMERD64_PATH, | |
488 | rundir); | |
489 | DBG("Removing directory %s", path); | |
490 | (void) rmdir(path); | |
5461b305 | 491 | |
bd69add2 | 492 | free(rundir); |
5461b305 | 493 | |
99bab54f | 494 | DBG("Cleaning up all sessions"); |
fac6795d | 495 | |
b5541356 | 496 | /* Destroy session list mutex */ |
273ea72c DG |
497 | if (session_list_ptr != NULL) { |
498 | pthread_mutex_destroy(&session_list_ptr->lock); | |
499 | ||
500 | /* Cleanup ALL session */ | |
54d01ffb DG |
501 | cds_list_for_each_entry_safe(sess, stmp, |
502 | &session_list_ptr->head, list) { | |
2f77fc4b | 503 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
504 | } |
505 | } | |
506 | ||
099e26bd | 507 | DBG("Closing all UST sockets"); |
56fff090 | 508 | ust_app_clean_list(); |
7972aab2 | 509 | buffer_reg_destroy_registries(); |
099e26bd | 510 | |
4fba7219 DG |
511 | if (is_root && !opt_no_kernel) { |
512 | DBG2("Closing kernel fd"); | |
a4b35e07 | 513 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
514 | ret = close(kernel_tracer_fd); |
515 | if (ret) { | |
516 | PERROR("close"); | |
517 | } | |
a4b35e07 | 518 | } |
2f50c8a3 | 519 | DBG("Unloading kernel modules"); |
096102bd | 520 | modprobe_remove_lttng_all(); |
2f50c8a3 | 521 | } |
2f77fc4b | 522 | |
e975f9f8 DG |
523 | close_consumer_sockets(); |
524 | ||
421cb601 | 525 | /* <fun> */ |
f56a39af | 526 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
527 | "Matthew, BEET driven development works!%c[%dm", |
528 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
529 | /* </fun> */ | |
fac6795d DG |
530 | } |
531 | ||
e065084a | 532 | /* |
d063d709 | 533 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 534 | * |
d063d709 | 535 | * Return lttcomm error code. |
e065084a DG |
536 | */ |
537 | static int send_unix_sock(int sock, void *buf, size_t len) | |
538 | { | |
539 | /* Check valid length */ | |
c617c0c6 | 540 | if (len == 0) { |
e065084a DG |
541 | return -1; |
542 | } | |
543 | ||
544 | return lttcomm_send_unix_sock(sock, buf, len); | |
545 | } | |
546 | ||
5461b305 | 547 | /* |
d063d709 | 548 | * Free memory of a command context structure. |
5461b305 | 549 | */ |
a2fb29a5 | 550 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 551 | { |
a2fb29a5 DG |
552 | DBG("Clean command context structure"); |
553 | if (*cmd_ctx) { | |
554 | if ((*cmd_ctx)->llm) { | |
555 | free((*cmd_ctx)->llm); | |
5461b305 | 556 | } |
a2fb29a5 DG |
557 | if ((*cmd_ctx)->lsm) { |
558 | free((*cmd_ctx)->lsm); | |
5461b305 | 559 | } |
a2fb29a5 DG |
560 | free(*cmd_ctx); |
561 | *cmd_ctx = NULL; | |
5461b305 DG |
562 | } |
563 | } | |
564 | ||
fac6795d | 565 | /* |
0fdd1e2c | 566 | * Notify UST applications using the shm mmap futex. |
fac6795d | 567 | */ |
0fdd1e2c | 568 | static int notify_ust_apps(int active) |
fac6795d | 569 | { |
0fdd1e2c | 570 | char *wait_shm_mmap; |
fac6795d | 571 | |
0fdd1e2c | 572 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 573 | |
0fdd1e2c DG |
574 | /* See shm.c for this call implying mmap, shm and futex calls */ |
575 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
576 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
577 | goto error; |
578 | } | |
579 | ||
0fdd1e2c DG |
580 | /* Wake waiting process */ |
581 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
582 | ||
583 | /* Apps notified successfully */ | |
584 | return 0; | |
fac6795d DG |
585 | |
586 | error: | |
0fdd1e2c | 587 | return -1; |
fac6795d DG |
588 | } |
589 | ||
e065084a | 590 | /* |
d063d709 DG |
591 | * Setup the outgoing data buffer for the response (llm) by allocating the |
592 | * right amount of memory and copying the original information from the lsm | |
593 | * structure. | |
ca95a216 | 594 | * |
d063d709 | 595 | * Return total size of the buffer pointed by buf. |
ca95a216 | 596 | */ |
5461b305 | 597 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 598 | { |
f3ed775e | 599 | int ret, buf_size; |
ca95a216 | 600 | |
f3ed775e | 601 | buf_size = size; |
5461b305 | 602 | |
ba7f0ae5 | 603 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 604 | if (cmd_ctx->llm == NULL) { |
76d7553f | 605 | PERROR("zmalloc"); |
5461b305 | 606 | ret = -ENOMEM; |
ca95a216 DG |
607 | goto error; |
608 | } | |
609 | ||
5461b305 DG |
610 | /* Copy common data */ |
611 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 612 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 613 | |
5461b305 DG |
614 | cmd_ctx->llm->data_size = size; |
615 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
616 | ||
ca95a216 DG |
617 | return buf_size; |
618 | ||
619 | error: | |
620 | return ret; | |
621 | } | |
622 | ||
7a485870 | 623 | /* |
5eb91c98 | 624 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 625 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 626 | */ |
5eb91c98 | 627 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 628 | { |
5eb91c98 | 629 | int ret; |
7a485870 DG |
630 | struct ltt_session *session; |
631 | struct ltt_kernel_channel *channel; | |
632 | ||
5eb91c98 | 633 | DBG("Updating kernel poll set"); |
7a485870 | 634 | |
54d01ffb | 635 | session_lock_list(); |
b5541356 | 636 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 637 | session_lock(session); |
7a485870 | 638 | if (session->kernel_session == NULL) { |
54d01ffb | 639 | session_unlock(session); |
7a485870 DG |
640 | continue; |
641 | } | |
7a485870 | 642 | |
54d01ffb DG |
643 | cds_list_for_each_entry(channel, |
644 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
645 | /* Add channel fd to the kernel poll set */ |
646 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
647 | if (ret < 0) { | |
54d01ffb | 648 | session_unlock(session); |
5eb91c98 DG |
649 | goto error; |
650 | } | |
651 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 652 | } |
54d01ffb | 653 | session_unlock(session); |
7a485870 | 654 | } |
54d01ffb | 655 | session_unlock_list(); |
7a485870 | 656 | |
5eb91c98 | 657 | return 0; |
7a485870 DG |
658 | |
659 | error: | |
54d01ffb | 660 | session_unlock_list(); |
7a485870 DG |
661 | return -1; |
662 | } | |
663 | ||
664 | /* | |
54d01ffb | 665 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 666 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 667 | * |
d063d709 | 668 | * Useful for CPU hotplug feature. |
7a485870 | 669 | */ |
2bdd86d4 | 670 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
671 | { |
672 | int ret = 0; | |
673 | struct ltt_session *session; | |
173af62f | 674 | struct ltt_kernel_session *ksess; |
7a485870 DG |
675 | struct ltt_kernel_channel *channel; |
676 | ||
677 | DBG("Updating kernel streams for channel fd %d", fd); | |
678 | ||
54d01ffb | 679 | session_lock_list(); |
b5541356 | 680 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 681 | session_lock(session); |
7a485870 | 682 | if (session->kernel_session == NULL) { |
54d01ffb | 683 | session_unlock(session); |
7a485870 DG |
684 | continue; |
685 | } | |
173af62f | 686 | ksess = session->kernel_session; |
d9800920 | 687 | |
173af62f | 688 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
689 | if (channel->fd == fd) { |
690 | DBG("Channel found, updating kernel streams"); | |
691 | ret = kernel_open_channel_stream(channel); | |
692 | if (ret < 0) { | |
b3c750d2 | 693 | goto error; |
7a485870 | 694 | } |
5c786ded JD |
695 | /* Update the stream global counter */ |
696 | ksess->stream_count_global += ret; | |
d9800920 | 697 | |
7a485870 | 698 | /* |
5eb91c98 DG |
699 | * Have we already sent fds to the consumer? If yes, it means |
700 | * that tracing is started so it is safe to send our updated | |
701 | * stream fds. | |
7a485870 | 702 | */ |
173af62f DG |
703 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
704 | struct lttng_ht_iter iter; | |
705 | struct consumer_socket *socket; | |
706 | ||
e7fe706f | 707 | rcu_read_lock(); |
173af62f DG |
708 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
709 | &iter.iter, socket, node.node) { | |
173af62f | 710 | pthread_mutex_lock(socket->lock); |
f50f23d9 | 711 | ret = kernel_consumer_send_channel_stream(socket, |
2bba9e53 DG |
712 | channel, ksess, |
713 | session->output_traces ? 1 : 0); | |
173af62f DG |
714 | pthread_mutex_unlock(socket->lock); |
715 | if (ret < 0) { | |
e7fe706f | 716 | rcu_read_unlock(); |
173af62f DG |
717 | goto error; |
718 | } | |
7a485870 | 719 | } |
e7fe706f | 720 | rcu_read_unlock(); |
7a485870 | 721 | } |
b3c750d2 | 722 | goto error; |
7a485870 DG |
723 | } |
724 | } | |
54d01ffb | 725 | session_unlock(session); |
7a485870 | 726 | } |
54d01ffb | 727 | session_unlock_list(); |
b3c750d2 | 728 | return ret; |
7a485870 | 729 | |
b3c750d2 | 730 | error: |
54d01ffb DG |
731 | session_unlock(session); |
732 | session_unlock_list(); | |
7a485870 DG |
733 | return ret; |
734 | } | |
735 | ||
487cf67c | 736 | /* |
ffe60014 DG |
737 | * For each tracing session, update newly registered apps. The session list |
738 | * lock MUST be acquired before calling this. | |
487cf67c DG |
739 | */ |
740 | static void update_ust_app(int app_sock) | |
741 | { | |
742 | struct ltt_session *sess, *stmp; | |
743 | ||
fdadac08 DG |
744 | /* Consumer is in an ERROR state. Stop any application update. */ |
745 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
746 | /* Stop the update process since the consumer is dead. */ | |
747 | return; | |
748 | } | |
749 | ||
487cf67c DG |
750 | /* For all tracing session(s) */ |
751 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 752 | session_lock(sess); |
421cb601 DG |
753 | if (sess->ust_session) { |
754 | ust_app_global_update(sess->ust_session, app_sock); | |
755 | } | |
4ee14516 | 756 | session_unlock(sess); |
487cf67c DG |
757 | } |
758 | } | |
759 | ||
7a485870 | 760 | /* |
d063d709 | 761 | * This thread manage event coming from the kernel. |
7a485870 | 762 | * |
d063d709 DG |
763 | * Features supported in this thread: |
764 | * -) CPU Hotplug | |
7a485870 DG |
765 | */ |
766 | static void *thread_manage_kernel(void *data) | |
767 | { | |
139ac872 | 768 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 769 | uint32_t revents, nb_fd; |
7a485870 | 770 | char tmp; |
5eb91c98 | 771 | struct lttng_poll_event events; |
7a485870 | 772 | |
6993eeb3 | 773 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 774 | |
6c71277b | 775 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 776 | |
d5d63bf1 DG |
777 | /* |
778 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 779 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 780 | */ |
6d737ce4 | 781 | lttng_poll_init(&events); |
d5d63bf1 | 782 | |
6993eeb3 CB |
783 | if (testpoint(thread_manage_kernel)) { |
784 | goto error_testpoint; | |
785 | } | |
8ac94142 | 786 | |
840cb59c | 787 | health_code_update(); |
44a5e5eb | 788 | |
6993eeb3 | 789 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 790 | goto error_testpoint; |
6993eeb3 CB |
791 | } |
792 | ||
7a485870 | 793 | while (1) { |
840cb59c | 794 | health_code_update(); |
44a5e5eb | 795 | |
7a485870 | 796 | if (update_poll_flag == 1) { |
d21b0d71 DG |
797 | /* Clean events object. We are about to populate it again. */ |
798 | lttng_poll_clean(&events); | |
799 | ||
d0b96690 | 800 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
801 | if (ret < 0) { |
802 | goto error_poll_create; | |
803 | } | |
804 | ||
805 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
806 | if (ret < 0) { | |
807 | goto error; | |
808 | } | |
5f822d0a | 809 | |
d21b0d71 | 810 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
811 | ret = update_kernel_poll(&events); |
812 | if (ret < 0) { | |
7a485870 DG |
813 | goto error; |
814 | } | |
815 | update_poll_flag = 0; | |
816 | } | |
817 | ||
d21b0d71 | 818 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
819 | |
820 | /* Poll infinite value of time */ | |
88f2b785 | 821 | restart: |
a78af745 | 822 | health_poll_entry(); |
5eb91c98 | 823 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 824 | health_poll_exit(); |
7a485870 | 825 | if (ret < 0) { |
88f2b785 MD |
826 | /* |
827 | * Restart interrupted system call. | |
828 | */ | |
829 | if (errno == EINTR) { | |
830 | goto restart; | |
831 | } | |
7a485870 DG |
832 | goto error; |
833 | } else if (ret == 0) { | |
834 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
835 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
836 | "This should not have happened! Continuing..."); | |
7a485870 DG |
837 | continue; |
838 | } | |
839 | ||
0d9c5d77 DG |
840 | nb_fd = ret; |
841 | ||
5eb91c98 DG |
842 | for (i = 0; i < nb_fd; i++) { |
843 | /* Fetch once the poll data */ | |
844 | revents = LTTNG_POLL_GETEV(&events, i); | |
845 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 846 | |
840cb59c | 847 | health_code_update(); |
44a5e5eb | 848 | |
5eb91c98 | 849 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 850 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 851 | if (ret) { |
139ac872 MD |
852 | err = 0; |
853 | goto exit; | |
5eb91c98 | 854 | } |
7a485870 | 855 | |
5eb91c98 DG |
856 | /* Check for data on kernel pipe */ |
857 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
858 | do { |
859 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
860 | } while (ret < 0 && errno == EINTR); | |
861 | /* | |
862 | * Ret value is useless here, if this pipe gets any actions an | |
863 | * update is required anyway. | |
864 | */ | |
5eb91c98 DG |
865 | update_poll_flag = 1; |
866 | continue; | |
867 | } else { | |
868 | /* | |
869 | * New CPU detected by the kernel. Adding kernel stream to | |
870 | * kernel session and updating the kernel consumer | |
871 | */ | |
872 | if (revents & LPOLLIN) { | |
2bdd86d4 | 873 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
874 | if (ret < 0) { |
875 | continue; | |
876 | } | |
877 | break; | |
878 | /* | |
879 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
880 | * and unregister kernel stream at this point. | |
881 | */ | |
7a485870 | 882 | } |
7a485870 DG |
883 | } |
884 | } | |
885 | } | |
886 | ||
139ac872 | 887 | exit: |
7a485870 | 888 | error: |
5eb91c98 | 889 | lttng_poll_clean(&events); |
76d7553f | 890 | error_poll_create: |
6993eeb3 | 891 | error_testpoint: |
6620da75 DG |
892 | utils_close_pipe(kernel_poll_pipe); |
893 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 894 | if (err) { |
840cb59c | 895 | health_error(); |
139ac872 | 896 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
897 | WARN("Kernel thread died unexpectedly. " |
898 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 899 | } |
8782cc74 | 900 | health_unregister(health_sessiond); |
76d7553f | 901 | DBG("Kernel thread dying"); |
7a485870 DG |
902 | return NULL; |
903 | } | |
904 | ||
a23ec3a7 DG |
905 | /* |
906 | * Signal pthread condition of the consumer data that the thread. | |
907 | */ | |
908 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
909 | { | |
910 | pthread_mutex_lock(&data->cond_mutex); | |
911 | ||
912 | /* | |
913 | * The state is set before signaling. It can be any value, it's the waiter | |
914 | * job to correctly interpret this condition variable associated to the | |
915 | * consumer pthread_cond. | |
916 | * | |
917 | * A value of 0 means that the corresponding thread of the consumer data | |
918 | * was not started. 1 indicates that the thread has started and is ready | |
919 | * for action. A negative value means that there was an error during the | |
920 | * thread bootstrap. | |
921 | */ | |
922 | data->consumer_thread_is_ready = state; | |
923 | (void) pthread_cond_signal(&data->cond); | |
924 | ||
925 | pthread_mutex_unlock(&data->cond_mutex); | |
926 | } | |
927 | ||
1d4b027a | 928 | /* |
3bd1e081 | 929 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 930 | */ |
3bd1e081 | 931 | static void *thread_manage_consumer(void *data) |
1d4b027a | 932 | { |
139ac872 | 933 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 934 | uint32_t revents, nb_fd; |
1d4b027a | 935 | enum lttcomm_return_code code; |
5eb91c98 | 936 | struct lttng_poll_event events; |
3bd1e081 | 937 | struct consumer_data *consumer_data = data; |
1d4b027a | 938 | |
3bd1e081 | 939 | DBG("[thread] Manage consumer started"); |
1d4b027a | 940 | |
6c71277b | 941 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 942 | |
855060f8 | 943 | health_code_update(); |
9449cc75 | 944 | |
5eb91c98 | 945 | /* |
331744e3 JD |
946 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
947 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 948 | */ |
331744e3 | 949 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 950 | if (ret < 0) { |
76d7553f | 951 | goto error_poll; |
5eb91c98 | 952 | } |
273ea72c | 953 | |
edb8b045 DG |
954 | /* |
955 | * The error socket here is already in a listening state which was done | |
956 | * just before spawning this thread to avoid a race between the consumer | |
957 | * daemon exec trying to connect and the listen() call. | |
958 | */ | |
3bd1e081 | 959 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
960 | if (ret < 0) { |
961 | goto error; | |
962 | } | |
963 | ||
840cb59c | 964 | health_code_update(); |
44a5e5eb | 965 | |
331744e3 | 966 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 967 | restart: |
a78af745 | 968 | health_poll_entry(); |
8ac94142 | 969 | |
6993eeb3 CB |
970 | if (testpoint(thread_manage_consumer)) { |
971 | goto error; | |
972 | } | |
8ac94142 | 973 | |
5eb91c98 | 974 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 975 | health_poll_exit(); |
273ea72c | 976 | if (ret < 0) { |
88f2b785 MD |
977 | /* |
978 | * Restart interrupted system call. | |
979 | */ | |
980 | if (errno == EINTR) { | |
981 | goto restart; | |
982 | } | |
273ea72c DG |
983 | goto error; |
984 | } | |
985 | ||
0d9c5d77 DG |
986 | nb_fd = ret; |
987 | ||
5eb91c98 DG |
988 | for (i = 0; i < nb_fd; i++) { |
989 | /* Fetch once the poll data */ | |
990 | revents = LTTNG_POLL_GETEV(&events, i); | |
991 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
992 | ||
840cb59c | 993 | health_code_update(); |
44a5e5eb | 994 | |
5eb91c98 | 995 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 996 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 997 | if (ret) { |
139ac872 MD |
998 | err = 0; |
999 | goto exit; | |
5eb91c98 DG |
1000 | } |
1001 | ||
1002 | /* Event on the registration socket */ | |
3bd1e081 | 1003 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1004 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1005 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1006 | goto error; |
1007 | } | |
1008 | } | |
273ea72c DG |
1009 | } |
1010 | ||
3bd1e081 | 1011 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1012 | if (sock < 0) { |
1013 | goto error; | |
1014 | } | |
1015 | ||
b662582b DG |
1016 | /* |
1017 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1018 | * show must go on. | |
1019 | */ | |
1020 | (void) utils_set_fd_cloexec(sock); | |
1021 | ||
840cb59c | 1022 | health_code_update(); |
44a5e5eb | 1023 | |
3bd1e081 | 1024 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1025 | |
712ea556 | 1026 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1027 | ret = lttcomm_recv_unix_sock(sock, &code, |
1028 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1029 | if (ret <= 0) { |
1030 | goto error; | |
1031 | } | |
1032 | ||
840cb59c | 1033 | health_code_update(); |
44a5e5eb | 1034 | |
f73fabfd | 1035 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1036 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1037 | consumer_data->cmd_sock = |
1038 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
4ce514c4 | 1039 | consumer_data->metadata_fd = |
331744e3 | 1040 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); |
92db7cdc DG |
1041 | if (consumer_data->cmd_sock < 0 |
1042 | || consumer_data->metadata_fd < 0) { | |
331744e3 | 1043 | PERROR("consumer connect cmd socket"); |
a23ec3a7 DG |
1044 | /* On error, signal condition and quit. */ |
1045 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1046 | goto error; |
1047 | } | |
9363801e | 1048 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; |
331744e3 JD |
1049 | /* Create metadata socket lock. */ |
1050 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1051 | if (consumer_data->metadata_sock.lock == NULL) { | |
1052 | PERROR("zmalloc pthread mutex"); | |
1053 | ret = -1; | |
1054 | goto error; | |
1055 | } | |
1056 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1057 | ||
a23ec3a7 | 1058 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1059 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1060 | DBG("Consumer metadata socket ready (fd: %d)", | |
4ce514c4 | 1061 | consumer_data->metadata_fd); |
1d4b027a | 1062 | } else { |
3bd1e081 | 1063 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1064 | lttcomm_get_readable_code(-code)); |
1065 | goto error; | |
1066 | } | |
1067 | ||
331744e3 | 1068 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1069 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1070 | if (ret < 0) { |
72079cae DG |
1071 | goto error; |
1072 | } | |
1073 | ||
331744e3 | 1074 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1075 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1076 | if (ret < 0) { | |
72079cae | 1077 | goto error; |
5eb91c98 DG |
1078 | } |
1079 | ||
331744e3 | 1080 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1081 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1082 | LPOLLIN | LPOLLRDHUP); |
1083 | if (ret < 0) { | |
1084 | goto error; | |
1085 | } | |
1086 | ||
840cb59c | 1087 | health_code_update(); |
44a5e5eb | 1088 | |
331744e3 | 1089 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1090 | restart_poll: |
331744e3 JD |
1091 | while (1) { |
1092 | health_poll_entry(); | |
1093 | ret = lttng_poll_wait(&events, -1); | |
1094 | health_poll_exit(); | |
1095 | if (ret < 0) { | |
1096 | /* | |
1097 | * Restart interrupted system call. | |
1098 | */ | |
1099 | if (errno == EINTR) { | |
1100 | goto restart_poll; | |
1101 | } | |
1102 | goto error; | |
88f2b785 | 1103 | } |
72079cae | 1104 | |
331744e3 | 1105 | nb_fd = ret; |
0d9c5d77 | 1106 | |
331744e3 JD |
1107 | for (i = 0; i < nb_fd; i++) { |
1108 | /* Fetch once the poll data */ | |
1109 | revents = LTTNG_POLL_GETEV(&events, i); | |
1110 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1111 | |
331744e3 | 1112 | health_code_update(); |
44a5e5eb | 1113 | |
331744e3 JD |
1114 | /* Thread quit pipe has been closed. Killing thread. */ |
1115 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
1116 | if (ret) { | |
1117 | err = 0; | |
1118 | goto exit; | |
1119 | } | |
5eb91c98 | 1120 | |
331744e3 JD |
1121 | if (pollfd == sock) { |
1122 | /* Event on the consumerd socket */ | |
1123 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1124 | ERR("consumer err socket second poll error"); | |
1125 | goto error; | |
1126 | } | |
1127 | health_code_update(); | |
1128 | /* Wait for any kconsumerd error */ | |
1129 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1130 | sizeof(enum lttcomm_return_code)); | |
1131 | if (ret <= 0) { | |
1132 | ERR("consumer closed the command socket"); | |
1133 | goto error; | |
1134 | } | |
1135 | ||
1136 | ERR("consumer return code : %s", | |
1137 | lttcomm_get_readable_code(-code)); | |
1138 | ||
1139 | goto exit; | |
4ce514c4 | 1140 | } else if (pollfd == consumer_data->metadata_fd) { |
331744e3 JD |
1141 | /* UST metadata requests */ |
1142 | ret = ust_consumer_metadata_request( | |
1143 | &consumer_data->metadata_sock); | |
1144 | if (ret < 0) { | |
1145 | ERR("Handling metadata request"); | |
1146 | goto error; | |
1147 | } | |
1148 | break; | |
1149 | } else { | |
1150 | ERR("Unknown pollfd"); | |
5eb91c98 DG |
1151 | goto error; |
1152 | } | |
1153 | } | |
331744e3 | 1154 | health_code_update(); |
5eb91c98 DG |
1155 | } |
1156 | ||
139ac872 | 1157 | exit: |
1d4b027a | 1158 | error: |
fdadac08 DG |
1159 | /* |
1160 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1161 | * thread might be using them so get exclusive access which will abort all |
1162 | * other consumer command by other threads. | |
fdadac08 DG |
1163 | */ |
1164 | pthread_mutex_lock(&consumer_data->lock); | |
1165 | ||
5c827ce0 DG |
1166 | /* Immediately set the consumerd state to stopped */ |
1167 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1168 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1169 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1170 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1171 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1172 | } else { | |
1173 | /* Code flow error... */ | |
1174 | assert(0); | |
1175 | } | |
1176 | ||
76d7553f MD |
1177 | if (consumer_data->err_sock >= 0) { |
1178 | ret = close(consumer_data->err_sock); | |
1179 | if (ret) { | |
1180 | PERROR("close"); | |
1181 | } | |
a76cbd9f | 1182 | consumer_data->err_sock = -1; |
76d7553f MD |
1183 | } |
1184 | if (consumer_data->cmd_sock >= 0) { | |
1185 | ret = close(consumer_data->cmd_sock); | |
1186 | if (ret) { | |
1187 | PERROR("close"); | |
1188 | } | |
a76cbd9f | 1189 | consumer_data->cmd_sock = -1; |
76d7553f | 1190 | } |
9363801e DG |
1191 | if (*consumer_data->metadata_sock.fd_ptr >= 0) { |
1192 | ret = close(*consumer_data->metadata_sock.fd_ptr); | |
331744e3 JD |
1193 | if (ret) { |
1194 | PERROR("close"); | |
1195 | } | |
1196 | } | |
331744e3 | 1197 | |
76d7553f MD |
1198 | if (sock >= 0) { |
1199 | ret = close(sock); | |
1200 | if (ret) { | |
1201 | PERROR("close"); | |
1202 | } | |
1203 | } | |
273ea72c | 1204 | |
3bd1e081 MD |
1205 | unlink(consumer_data->err_unix_sock_path); |
1206 | unlink(consumer_data->cmd_unix_sock_path); | |
1207 | consumer_data->pid = 0; | |
fdadac08 | 1208 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1209 | |
fdadac08 DG |
1210 | /* Cleanup metadata socket mutex. */ |
1211 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1212 | free(consumer_data->metadata_sock.lock); | |
1d4b027a | 1213 | |
5eb91c98 | 1214 | lttng_poll_clean(&events); |
76d7553f | 1215 | error_poll: |
139ac872 | 1216 | if (err) { |
840cb59c | 1217 | health_error(); |
139ac872 MD |
1218 | ERR("Health error occurred in %s", __func__); |
1219 | } | |
8782cc74 | 1220 | health_unregister(health_sessiond); |
76d7553f | 1221 | DBG("consumer thread cleanup completed"); |
0177d773 | 1222 | |
5eb91c98 | 1223 | return NULL; |
099e26bd DG |
1224 | } |
1225 | ||
099e26bd DG |
1226 | /* |
1227 | * This thread manage application communication. | |
1d4b027a DG |
1228 | */ |
1229 | static void *thread_manage_apps(void *data) | |
099e26bd | 1230 | { |
139ac872 | 1231 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1232 | uint32_t revents, nb_fd; |
5eb91c98 | 1233 | struct lttng_poll_event events; |
099e26bd DG |
1234 | |
1235 | DBG("[thread] Manage application started"); | |
1236 | ||
f6a9efaa DG |
1237 | rcu_register_thread(); |
1238 | rcu_thread_online(); | |
1239 | ||
6c71277b | 1240 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1241 | |
6993eeb3 CB |
1242 | if (testpoint(thread_manage_apps)) { |
1243 | goto error_testpoint; | |
1244 | } | |
1245 | ||
840cb59c | 1246 | health_code_update(); |
44a5e5eb | 1247 | |
d0b96690 | 1248 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1249 | if (ret < 0) { |
76d7553f | 1250 | goto error_poll_create; |
5eb91c98 | 1251 | } |
099e26bd | 1252 | |
5eb91c98 DG |
1253 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1254 | if (ret < 0) { | |
1255 | goto error; | |
1256 | } | |
099e26bd | 1257 | |
6993eeb3 CB |
1258 | if (testpoint(thread_manage_apps_before_loop)) { |
1259 | goto error; | |
1260 | } | |
8ac94142 | 1261 | |
840cb59c | 1262 | health_code_update(); |
44a5e5eb | 1263 | |
5eb91c98 | 1264 | while (1) { |
d21b0d71 | 1265 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1266 | |
1267 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1268 | restart: |
a78af745 | 1269 | health_poll_entry(); |
5eb91c98 | 1270 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1271 | health_poll_exit(); |
099e26bd | 1272 | if (ret < 0) { |
88f2b785 MD |
1273 | /* |
1274 | * Restart interrupted system call. | |
1275 | */ | |
1276 | if (errno == EINTR) { | |
1277 | goto restart; | |
1278 | } | |
099e26bd DG |
1279 | goto error; |
1280 | } | |
1281 | ||
0d9c5d77 DG |
1282 | nb_fd = ret; |
1283 | ||
5eb91c98 DG |
1284 | for (i = 0; i < nb_fd; i++) { |
1285 | /* Fetch once the poll data */ | |
1286 | revents = LTTNG_POLL_GETEV(&events, i); | |
1287 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1288 | ||
840cb59c | 1289 | health_code_update(); |
44a5e5eb | 1290 | |
5eb91c98 | 1291 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1292 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1293 | if (ret) { |
139ac872 MD |
1294 | err = 0; |
1295 | goto exit; | |
5eb91c98 | 1296 | } |
099e26bd | 1297 | |
5eb91c98 DG |
1298 | /* Inspect the apps cmd pipe */ |
1299 | if (pollfd == apps_cmd_pipe[0]) { | |
1300 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1301 | ERR("Apps command pipe error"); | |
0177d773 | 1302 | goto error; |
5eb91c98 | 1303 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1304 | int sock; |
1305 | ||
5eb91c98 | 1306 | /* Empty pipe */ |
f921c78f | 1307 | do { |
d0b96690 | 1308 | ret = read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
f921c78f | 1309 | } while (ret < 0 && errno == EINTR); |
d0b96690 | 1310 | if (ret < 0 || ret < sizeof(sock)) { |
76d7553f | 1311 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1312 | goto error; |
1313 | } | |
099e26bd | 1314 | |
840cb59c | 1315 | health_code_update(); |
44a5e5eb | 1316 | |
ffe60014 | 1317 | /* |
d0b96690 DG |
1318 | * We only monitor the error events of the socket. This |
1319 | * thread does not handle any incoming data from UST | |
1320 | * (POLLIN). | |
ffe60014 | 1321 | */ |
d0b96690 DG |
1322 | ret = lttng_poll_add(&events, sock, |
1323 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1324 | if (ret < 0) { | |
5eb91c98 | 1325 | goto error; |
e0c7ec2b | 1326 | } |
acc7b41b | 1327 | |
783a3b9a MD |
1328 | /* |
1329 | * Set socket timeout for both receiving and ending. | |
1330 | * app_socket_timeout is in seconds, whereas | |
1331 | * lttcomm_setsockopt_rcv_timeout and | |
1332 | * lttcomm_setsockopt_snd_timeout expect msec as | |
1333 | * parameter. | |
1334 | */ | |
d0b96690 | 1335 | (void) lttcomm_setsockopt_rcv_timeout(sock, |
783a3b9a | 1336 | app_socket_timeout * 1000); |
d0b96690 | 1337 | (void) lttcomm_setsockopt_snd_timeout(sock, |
783a3b9a | 1338 | app_socket_timeout * 1000); |
ae9e45b3 | 1339 | |
d0b96690 | 1340 | DBG("Apps with sock %d added to poll set", sock); |
487cf67c | 1341 | |
840cb59c | 1342 | health_code_update(); |
44a5e5eb | 1343 | |
5eb91c98 | 1344 | break; |
0177d773 | 1345 | } |
5eb91c98 DG |
1346 | } else { |
1347 | /* | |
54d01ffb DG |
1348 | * At this point, we know that a registered application made |
1349 | * the event at poll_wait. | |
5eb91c98 DG |
1350 | */ |
1351 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1352 | /* Removing from the poll set */ | |
1353 | ret = lttng_poll_del(&events, pollfd); | |
1354 | if (ret < 0) { | |
1355 | goto error; | |
1356 | } | |
099e26bd | 1357 | |
b9d9b220 | 1358 | /* Socket closed on remote end. */ |
56fff090 | 1359 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1360 | break; |
1361 | } | |
099e26bd | 1362 | } |
44a5e5eb | 1363 | |
840cb59c | 1364 | health_code_update(); |
099e26bd | 1365 | } |
099e26bd DG |
1366 | } |
1367 | ||
139ac872 | 1368 | exit: |
099e26bd | 1369 | error: |
5eb91c98 | 1370 | lttng_poll_clean(&events); |
76d7553f | 1371 | error_poll_create: |
6993eeb3 | 1372 | error_testpoint: |
6620da75 DG |
1373 | utils_close_pipe(apps_cmd_pipe); |
1374 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1375 | ||
1376 | /* | |
1377 | * We don't clean the UST app hash table here since already registered | |
1378 | * applications can still be controlled so let them be until the session | |
1379 | * daemon dies or the applications stop. | |
1380 | */ | |
1381 | ||
139ac872 | 1382 | if (err) { |
840cb59c | 1383 | health_error(); |
139ac872 MD |
1384 | ERR("Health error occurred in %s", __func__); |
1385 | } | |
8782cc74 | 1386 | health_unregister(health_sessiond); |
76d7553f | 1387 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1388 | rcu_thread_offline(); |
1389 | rcu_unregister_thread(); | |
099e26bd DG |
1390 | return NULL; |
1391 | } | |
1392 | ||
d0b96690 | 1393 | /* |
d88aee68 DG |
1394 | * Send a socket to a thread This is called from the dispatch UST registration |
1395 | * thread once all sockets are set for the application. | |
d0b96690 | 1396 | * |
b85dc84c DG |
1397 | * The sock value can be invalid, we don't really care, the thread will handle |
1398 | * it and make the necessary cleanup if so. | |
1399 | * | |
d0b96690 DG |
1400 | * On success, return 0 else a negative value being the errno message of the |
1401 | * write(). | |
1402 | */ | |
d88aee68 | 1403 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 DG |
1404 | { |
1405 | int ret; | |
1406 | ||
b85dc84c DG |
1407 | /* |
1408 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1409 | * before calling this function being a shutdown state of the thread. | |
1410 | */ | |
1411 | if (fd < 0) { | |
1412 | ret = -EBADF; | |
1413 | goto error; | |
1414 | } | |
d0b96690 DG |
1415 | |
1416 | do { | |
d88aee68 | 1417 | ret = write(fd, &sock, sizeof(sock)); |
d0b96690 | 1418 | } while (ret < 0 && errno == EINTR); |
d88aee68 DG |
1419 | if (ret < 0 || ret != sizeof(sock)) { |
1420 | PERROR("write apps pipe %d", fd); | |
d0b96690 DG |
1421 | if (ret < 0) { |
1422 | ret = -errno; | |
1423 | } | |
1424 | goto error; | |
1425 | } | |
1426 | ||
1427 | /* All good. Don't send back the write positive ret value. */ | |
1428 | ret = 0; | |
1429 | error: | |
1430 | return ret; | |
1431 | } | |
1432 | ||
f45e313d DG |
1433 | /* |
1434 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1435 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1436 | * notify socket is never received. | |
1437 | */ | |
1438 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1439 | { | |
1440 | int ret, nb_fd = 0, i; | |
1441 | unsigned int fd_added = 0; | |
1442 | struct lttng_poll_event events; | |
1443 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1444 | ||
1445 | assert(wait_queue); | |
1446 | ||
1447 | lttng_poll_init(&events); | |
1448 | ||
1449 | /* Just skip everything for an empty queue. */ | |
1450 | if (!wait_queue->count) { | |
1451 | goto end; | |
1452 | } | |
1453 | ||
1454 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1455 | if (ret < 0) { | |
1456 | goto error_create; | |
1457 | } | |
1458 | ||
1459 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1460 | &wait_queue->head, head) { | |
1461 | assert(wait_node->app); | |
1462 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1463 | LPOLLHUP | LPOLLERR); | |
1464 | if (ret < 0) { | |
1465 | goto error; | |
1466 | } | |
1467 | ||
1468 | fd_added = 1; | |
1469 | } | |
1470 | ||
1471 | if (!fd_added) { | |
1472 | goto end; | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * Poll but don't block so we can quickly identify the faulty events and | |
1477 | * clean them afterwards from the wait queue. | |
1478 | */ | |
1479 | ret = lttng_poll_wait(&events, 0); | |
1480 | if (ret < 0) { | |
1481 | goto error; | |
1482 | } | |
1483 | nb_fd = ret; | |
1484 | ||
1485 | for (i = 0; i < nb_fd; i++) { | |
1486 | /* Get faulty FD. */ | |
1487 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1488 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1489 | ||
1490 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1491 | &wait_queue->head, head) { | |
1492 | if (pollfd == wait_node->app->sock && | |
1493 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1494 | cds_list_del(&wait_node->head); | |
1495 | wait_queue->count--; | |
1496 | ust_app_destroy(wait_node->app); | |
1497 | free(wait_node); | |
1498 | break; | |
1499 | } | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | if (nb_fd > 0) { | |
1504 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1505 | } | |
1506 | ||
1507 | end: | |
1508 | lttng_poll_clean(&events); | |
1509 | return; | |
1510 | ||
1511 | error: | |
1512 | lttng_poll_clean(&events); | |
1513 | error_create: | |
1514 | ERR("Unable to sanitize wait queue"); | |
1515 | return; | |
1516 | } | |
1517 | ||
099e26bd DG |
1518 | /* |
1519 | * Dispatch request from the registration threads to the application | |
1520 | * communication thread. | |
1521 | */ | |
1522 | static void *thread_dispatch_ust_registration(void *data) | |
1523 | { | |
12e2b881 | 1524 | int ret, err = -1; |
099e26bd DG |
1525 | struct cds_wfq_node *node; |
1526 | struct ust_command *ust_cmd = NULL; | |
f45e313d DG |
1527 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1528 | struct ust_reg_wait_queue wait_queue = { | |
1529 | .count = 0, | |
1530 | }; | |
d0b96690 | 1531 | |
6c71277b | 1532 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 MD |
1533 | |
1534 | health_code_update(); | |
1535 | ||
f45e313d | 1536 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1537 | |
1538 | DBG("[thread] Dispatch UST command started"); | |
1539 | ||
26c9d55e | 1540 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1541 | health_code_update(); |
1542 | ||
099e26bd DG |
1543 | /* Atomically prepare the queue futex */ |
1544 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1545 | ||
1546 | do { | |
d0b96690 | 1547 | struct ust_app *app = NULL; |
7972aab2 | 1548 | ust_cmd = NULL; |
d0b96690 | 1549 | |
f45e313d DG |
1550 | /* |
1551 | * Make sure we don't have node(s) that have hung up before receiving | |
1552 | * the notify socket. This is to clean the list in order to avoid | |
1553 | * memory leaks from notify socket that are never seen. | |
1554 | */ | |
1555 | sanitize_wait_queue(&wait_queue); | |
1556 | ||
12e2b881 | 1557 | health_code_update(); |
099e26bd DG |
1558 | /* Dequeue command for registration */ |
1559 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1560 | if (node == NULL) { | |
00a17c97 | 1561 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1562 | /* Continue thread execution */ |
1563 | break; | |
1564 | } | |
1565 | ||
1566 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1567 | ||
2f50c8a3 DG |
1568 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1569 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1570 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1571 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1572 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1573 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1574 | |
1575 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1576 | wait_node = zmalloc(sizeof(*wait_node)); | |
1577 | if (!wait_node) { | |
1578 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1579 | ret = close(ust_cmd->sock); |
1580 | if (ret < 0) { | |
1581 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1582 | } | |
1583 | lttng_fd_put(1, LTTNG_FD_APPS); | |
7972aab2 | 1584 | free(ust_cmd); |
d0b96690 DG |
1585 | goto error; |
1586 | } | |
1587 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1588 | ||
1589 | /* Create application object if socket is CMD. */ | |
1590 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1591 | ust_cmd->sock); | |
1592 | if (!wait_node->app) { | |
1593 | ret = close(ust_cmd->sock); | |
1594 | if (ret < 0) { | |
1595 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1596 | } |
d88aee68 DG |
1597 | lttng_fd_put(1, LTTNG_FD_APPS); |
1598 | free(wait_node); | |
7972aab2 | 1599 | free(ust_cmd); |
d0b96690 DG |
1600 | continue; |
1601 | } | |
1602 | /* | |
1603 | * Add application to the wait queue so we can set the notify | |
1604 | * socket before putting this object in the global ht. | |
1605 | */ | |
f45e313d DG |
1606 | cds_list_add(&wait_node->head, &wait_queue.head); |
1607 | wait_queue.count++; | |
d0b96690 | 1608 | |
7972aab2 | 1609 | free(ust_cmd); |
d0b96690 DG |
1610 | /* |
1611 | * We have to continue here since we don't have the notify | |
1612 | * socket and the application MUST be added to the hash table | |
1613 | * only at that moment. | |
1614 | */ | |
1615 | continue; | |
1616 | } else { | |
1617 | /* | |
1618 | * Look for the application in the local wait queue and set the | |
1619 | * notify socket if found. | |
1620 | */ | |
d88aee68 | 1621 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1622 | &wait_queue.head, head) { |
12e2b881 | 1623 | health_code_update(); |
d0b96690 DG |
1624 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1625 | wait_node->app->notify_sock = ust_cmd->sock; | |
1626 | cds_list_del(&wait_node->head); | |
f45e313d | 1627 | wait_queue.count--; |
d0b96690 DG |
1628 | app = wait_node->app; |
1629 | free(wait_node); | |
1630 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1631 | break; | |
1632 | } | |
1633 | } | |
020d7f60 DG |
1634 | |
1635 | /* | |
1636 | * With no application at this stage the received socket is | |
1637 | * basically useless so close it before we free the cmd data | |
1638 | * structure for good. | |
1639 | */ | |
1640 | if (!app) { | |
1641 | ret = close(ust_cmd->sock); | |
1642 | if (ret < 0) { | |
1643 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1644 | } | |
1645 | lttng_fd_put(1, LTTNG_FD_APPS); | |
1646 | } | |
7972aab2 | 1647 | free(ust_cmd); |
d0b96690 DG |
1648 | } |
1649 | ||
1650 | if (app) { | |
d0b96690 DG |
1651 | /* |
1652 | * @session_lock_list | |
1653 | * | |
1654 | * Lock the global session list so from the register up to the | |
1655 | * registration done message, no thread can see the application | |
1656 | * and change its state. | |
1657 | */ | |
1658 | session_lock_list(); | |
1659 | rcu_read_lock(); | |
d88aee68 | 1660 | |
d0b96690 DG |
1661 | /* |
1662 | * Add application to the global hash table. This needs to be | |
1663 | * done before the update to the UST registry can locate the | |
1664 | * application. | |
1665 | */ | |
1666 | ust_app_add(app); | |
d88aee68 DG |
1667 | |
1668 | /* Set app version. This call will print an error if needed. */ | |
1669 | (void) ust_app_version(app); | |
1670 | ||
1671 | /* Send notify socket through the notify pipe. */ | |
1672 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1673 | app->notify_sock); | |
1674 | if (ret < 0) { | |
1675 | rcu_read_unlock(); | |
1676 | session_unlock_list(); | |
b85dc84c DG |
1677 | /* |
1678 | * No notify thread, stop the UST tracing. However, this is | |
1679 | * not an internal error of the this thread thus setting | |
1680 | * the health error code to a normal exit. | |
1681 | */ | |
1682 | err = 0; | |
d88aee68 | 1683 | goto error; |
6620da75 | 1684 | } |
d88aee68 | 1685 | |
d0b96690 DG |
1686 | /* |
1687 | * Update newly registered application with the tracing | |
1688 | * registry info already enabled information. | |
1689 | */ | |
1690 | update_ust_app(app->sock); | |
d88aee68 DG |
1691 | |
1692 | /* | |
1693 | * Don't care about return value. Let the manage apps threads | |
1694 | * handle app unregistration upon socket close. | |
1695 | */ | |
1696 | (void) ust_app_register_done(app->sock); | |
1697 | ||
1698 | /* | |
1699 | * Even if the application socket has been closed, send the app | |
1700 | * to the thread and unregistration will take place at that | |
1701 | * place. | |
1702 | */ | |
1703 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1704 | if (ret < 0) { |
d88aee68 DG |
1705 | rcu_read_unlock(); |
1706 | session_unlock_list(); | |
b85dc84c DG |
1707 | /* |
1708 | * No apps. thread, stop the UST tracing. However, this is | |
1709 | * not an internal error of the this thread thus setting | |
1710 | * the health error code to a normal exit. | |
1711 | */ | |
1712 | err = 0; | |
d88aee68 | 1713 | goto error; |
d0b96690 | 1714 | } |
d88aee68 | 1715 | |
d0b96690 DG |
1716 | rcu_read_unlock(); |
1717 | session_unlock_list(); | |
099e26bd | 1718 | } |
099e26bd DG |
1719 | } while (node != NULL); |
1720 | ||
12e2b881 | 1721 | health_poll_entry(); |
099e26bd DG |
1722 | /* Futex wait on queue. Blocking call on futex() */ |
1723 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1724 | health_poll_exit(); |
099e26bd | 1725 | } |
12e2b881 MD |
1726 | /* Normal exit, no error */ |
1727 | err = 0; | |
099e26bd DG |
1728 | |
1729 | error: | |
d88aee68 DG |
1730 | /* Clean up wait queue. */ |
1731 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1732 | &wait_queue.head, head) { |
d88aee68 | 1733 | cds_list_del(&wait_node->head); |
f45e313d | 1734 | wait_queue.count--; |
d88aee68 DG |
1735 | free(wait_node); |
1736 | } | |
1737 | ||
099e26bd | 1738 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1739 | if (err) { |
1740 | health_error(); | |
1741 | ERR("Health error occurred in %s", __func__); | |
1742 | } | |
8782cc74 | 1743 | health_unregister(health_sessiond); |
099e26bd DG |
1744 | return NULL; |
1745 | } | |
1746 | ||
1747 | /* | |
1748 | * This thread manage application registration. | |
1749 | */ | |
1750 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1751 | { |
139ac872 | 1752 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1753 | uint32_t revents, nb_fd; |
1754 | struct lttng_poll_event events; | |
099e26bd DG |
1755 | /* |
1756 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1757 | * freed in the manage apps thread. | |
1758 | */ | |
1759 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1760 | |
099e26bd | 1761 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1762 | |
6c71277b | 1763 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 1764 | |
6993eeb3 CB |
1765 | if (testpoint(thread_registration_apps)) { |
1766 | goto error_testpoint; | |
1767 | } | |
8ac94142 | 1768 | |
1d4b027a DG |
1769 | ret = lttcomm_listen_unix_sock(apps_sock); |
1770 | if (ret < 0) { | |
76d7553f | 1771 | goto error_listen; |
1d4b027a DG |
1772 | } |
1773 | ||
5eb91c98 DG |
1774 | /* |
1775 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1776 | * more will be added to this poll set. | |
1777 | */ | |
d0b96690 | 1778 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1779 | if (ret < 0) { |
76d7553f | 1780 | goto error_create_poll; |
5eb91c98 | 1781 | } |
273ea72c | 1782 | |
5eb91c98 DG |
1783 | /* Add the application registration socket */ |
1784 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1785 | if (ret < 0) { | |
76d7553f | 1786 | goto error_poll_add; |
5eb91c98 | 1787 | } |
273ea72c | 1788 | |
1d4b027a | 1789 | /* Notify all applications to register */ |
0fdd1e2c DG |
1790 | ret = notify_ust_apps(1); |
1791 | if (ret < 0) { | |
1792 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1793 | "Execution continues but there might be problem for already\n" |
1794 | "running applications that wishes to register."); | |
0fdd1e2c | 1795 | } |
1d4b027a DG |
1796 | |
1797 | while (1) { | |
1798 | DBG("Accepting application registration"); | |
273ea72c DG |
1799 | |
1800 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1801 | restart: |
a78af745 | 1802 | health_poll_entry(); |
5eb91c98 | 1803 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1804 | health_poll_exit(); |
273ea72c | 1805 | if (ret < 0) { |
88f2b785 MD |
1806 | /* |
1807 | * Restart interrupted system call. | |
1808 | */ | |
1809 | if (errno == EINTR) { | |
1810 | goto restart; | |
1811 | } | |
273ea72c DG |
1812 | goto error; |
1813 | } | |
1814 | ||
0d9c5d77 DG |
1815 | nb_fd = ret; |
1816 | ||
5eb91c98 | 1817 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1818 | health_code_update(); |
139ac872 | 1819 | |
5eb91c98 DG |
1820 | /* Fetch once the poll data */ |
1821 | revents = LTTNG_POLL_GETEV(&events, i); | |
1822 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1823 | |
5eb91c98 | 1824 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1825 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1826 | if (ret) { |
139ac872 MD |
1827 | err = 0; |
1828 | goto exit; | |
90014c57 | 1829 | } |
1d4b027a | 1830 | |
5eb91c98 DG |
1831 | /* Event on the registration socket */ |
1832 | if (pollfd == apps_sock) { | |
1833 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1834 | ERR("Register apps socket poll error"); | |
1835 | goto error; | |
1836 | } else if (revents & LPOLLIN) { | |
1837 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1838 | if (sock < 0) { | |
1839 | goto error; | |
1840 | } | |
099e26bd | 1841 | |
b662582b DG |
1842 | /* |
1843 | * Set the CLOEXEC flag. Return code is useless because | |
1844 | * either way, the show must go on. | |
1845 | */ | |
1846 | (void) utils_set_fd_cloexec(sock); | |
1847 | ||
5eb91c98 | 1848 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1849 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1850 | if (ust_cmd == NULL) { |
76d7553f | 1851 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1852 | goto error; |
1853 | } | |
1d4b027a | 1854 | |
5eb91c98 DG |
1855 | /* |
1856 | * Using message-based transmissions to ensure we don't | |
1857 | * have to deal with partially received messages. | |
1858 | */ | |
4063050c MD |
1859 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1860 | if (ret < 0) { | |
1861 | ERR("Exhausted file descriptors allowed for applications."); | |
1862 | free(ust_cmd); | |
1863 | ret = close(sock); | |
1864 | if (ret) { | |
1865 | PERROR("close"); | |
1866 | } | |
1867 | sock = -1; | |
1868 | continue; | |
1869 | } | |
d88aee68 | 1870 | |
840cb59c | 1871 | health_code_update(); |
d0b96690 DG |
1872 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1873 | if (ret < 0) { | |
5eb91c98 | 1874 | free(ust_cmd); |
d0b96690 | 1875 | /* Close socket of the application. */ |
76d7553f MD |
1876 | ret = close(sock); |
1877 | if (ret) { | |
1878 | PERROR("close"); | |
1879 | } | |
4063050c | 1880 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1881 | sock = -1; |
5eb91c98 DG |
1882 | continue; |
1883 | } | |
840cb59c | 1884 | health_code_update(); |
099e26bd | 1885 | |
5eb91c98 | 1886 | ust_cmd->sock = sock; |
34a2494f | 1887 | sock = -1; |
099e26bd | 1888 | |
5eb91c98 DG |
1889 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1890 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1891 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1892 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1893 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1894 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1895 | |
5eb91c98 DG |
1896 | /* |
1897 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1898 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1899 | */ |
1900 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1901 | ||
1902 | /* | |
1903 | * Wake the registration queue futex. Implicit memory | |
1904 | * barrier with the exchange in cds_wfq_enqueue. | |
1905 | */ | |
1906 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1907 | } | |
1908 | } | |
90014c57 | 1909 | } |
1d4b027a DG |
1910 | } |
1911 | ||
139ac872 | 1912 | exit: |
1d4b027a | 1913 | error: |
139ac872 | 1914 | if (err) { |
840cb59c | 1915 | health_error(); |
139ac872 MD |
1916 | ERR("Health error occurred in %s", __func__); |
1917 | } | |
139ac872 | 1918 | |
0fdd1e2c DG |
1919 | /* Notify that the registration thread is gone */ |
1920 | notify_ust_apps(0); | |
1921 | ||
a4b35e07 | 1922 | if (apps_sock >= 0) { |
76d7553f MD |
1923 | ret = close(apps_sock); |
1924 | if (ret) { | |
1925 | PERROR("close"); | |
1926 | } | |
a4b35e07 | 1927 | } |
46c3f085 | 1928 | if (sock >= 0) { |
76d7553f MD |
1929 | ret = close(sock); |
1930 | if (ret) { | |
1931 | PERROR("close"); | |
1932 | } | |
4063050c | 1933 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1934 | } |
273ea72c | 1935 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1936 | |
76d7553f | 1937 | error_poll_add: |
5eb91c98 | 1938 | lttng_poll_clean(&events); |
76d7553f MD |
1939 | error_listen: |
1940 | error_create_poll: | |
6993eeb3 | 1941 | error_testpoint: |
76d7553f | 1942 | DBG("UST Registration thread cleanup complete"); |
8782cc74 | 1943 | health_unregister(health_sessiond); |
5eb91c98 | 1944 | |
1d4b027a DG |
1945 | return NULL; |
1946 | } | |
1947 | ||
8c0faa1d | 1948 | /* |
3bd1e081 | 1949 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1950 | * exec or it will fails. |
8c0faa1d | 1951 | */ |
3bd1e081 | 1952 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1953 | { |
a23ec3a7 | 1954 | int ret, clock_ret; |
ee0b0061 DG |
1955 | struct timespec timeout; |
1956 | ||
a23ec3a7 DG |
1957 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1958 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1959 | |
a23ec3a7 DG |
1960 | /* Setup pthread condition */ |
1961 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1962 | if (ret != 0) { | |
1963 | errno = ret; | |
1964 | PERROR("pthread_condattr_init consumer data"); | |
1965 | goto error; | |
1966 | } | |
1967 | ||
1968 | /* | |
1969 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1970 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1971 | * for a more details and how we noticed it. | |
1972 | */ | |
1973 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1974 | if (ret != 0) { | |
1975 | errno = ret; | |
1976 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1977 | goto error; |
1978 | } | |
8c0faa1d | 1979 | |
a23ec3a7 DG |
1980 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1981 | if (ret != 0) { | |
1982 | errno = ret; | |
1983 | PERROR("pthread_cond_init consumer data"); | |
1984 | goto error; | |
1985 | } | |
1986 | ||
1987 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1988 | consumer_data); | |
8c0faa1d | 1989 | if (ret != 0) { |
3bd1e081 | 1990 | PERROR("pthread_create consumer"); |
ee0b0061 | 1991 | ret = -1; |
8c0faa1d DG |
1992 | goto error; |
1993 | } | |
1994 | ||
a23ec3a7 DG |
1995 | /* We are about to wait on a pthread condition */ |
1996 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1997 | ||
ee0b0061 | 1998 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1999 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
2000 | /* | |
2001 | * Set the timeout for the condition timed wait even if the clock gettime | |
2002 | * call fails since we might loop on that call and we want to avoid to | |
2003 | * increment the timeout too many times. | |
2004 | */ | |
2005 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2006 | ||
2007 | /* | |
2008 | * The following loop COULD be skipped in some conditions so this is why we | |
2009 | * set ret to 0 in order to make sure at least one round of the loop is | |
2010 | * done. | |
2011 | */ | |
2012 | ret = 0; | |
2013 | ||
2014 | /* | |
2015 | * Loop until the condition is reached or when a timeout is reached. Note | |
2016 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2017 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2018 | * possible. This loop does not take any chances and works with both of | |
2019 | * them. | |
2020 | */ | |
2021 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2022 | if (clock_ret < 0) { | |
2023 | PERROR("clock_gettime spawn consumer"); | |
2024 | /* Infinite wait for the consumerd thread to be ready */ | |
2025 | ret = pthread_cond_wait(&consumer_data->cond, | |
2026 | &consumer_data->cond_mutex); | |
2027 | } else { | |
2028 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2029 | &consumer_data->cond_mutex, &timeout); | |
2030 | } | |
ee0b0061 | 2031 | } |
8c0faa1d | 2032 | |
a23ec3a7 DG |
2033 | /* Release the pthread condition */ |
2034 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2035 | ||
2036 | if (ret != 0) { | |
2037 | errno = ret; | |
2038 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
2039 | /* |
2040 | * Call has timed out so we kill the kconsumerd_thread and return | |
2041 | * an error. | |
2042 | */ | |
a23ec3a7 DG |
2043 | ERR("Condition timed out. The consumer thread was never ready." |
2044 | " Killing it"); | |
3bd1e081 | 2045 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 2046 | if (ret < 0) { |
3bd1e081 | 2047 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2048 | } |
2049 | } else { | |
a23ec3a7 | 2050 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
2051 | } |
2052 | goto error; | |
2053 | } | |
2054 | ||
3bd1e081 MD |
2055 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2056 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2057 | ERR("Consumerd did not start"); |
3bd1e081 | 2058 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2059 | goto error; |
2060 | } | |
3bd1e081 | 2061 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2062 | |
8c0faa1d DG |
2063 | return 0; |
2064 | ||
2065 | error: | |
2066 | return ret; | |
2067 | } | |
2068 | ||
d9800920 | 2069 | /* |
3bd1e081 | 2070 | * Join consumer thread |
d9800920 | 2071 | */ |
3bd1e081 | 2072 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2073 | { |
2074 | void *status; | |
cf3af59e | 2075 | |
e8209f6b DG |
2076 | /* Consumer pid must be a real one. */ |
2077 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2078 | int ret; |
3bd1e081 | 2079 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2080 | if (ret) { |
3bd1e081 | 2081 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
2082 | return ret; |
2083 | } | |
3bd1e081 | 2084 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2085 | } else { |
2086 | return 0; | |
2087 | } | |
2088 | } | |
2089 | ||
8c0faa1d | 2090 | /* |
3bd1e081 | 2091 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2092 | * |
d063d709 | 2093 | * Return pid if successful else -1. |
8c0faa1d | 2094 | */ |
3bd1e081 | 2095 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2096 | { |
2097 | int ret; | |
2098 | pid_t pid; | |
94c55f17 | 2099 | const char *consumer_to_use; |
53086306 | 2100 | const char *verbosity; |
94c55f17 | 2101 | struct stat st; |
8c0faa1d | 2102 | |
3bd1e081 | 2103 | DBG("Spawning consumerd"); |
c49dc785 | 2104 | |
8c0faa1d DG |
2105 | pid = fork(); |
2106 | if (pid == 0) { | |
2107 | /* | |
3bd1e081 | 2108 | * Exec consumerd. |
8c0faa1d | 2109 | */ |
daee5345 | 2110 | if (opt_verbose_consumer) { |
53086306 DG |
2111 | verbosity = "--verbose"; |
2112 | } else { | |
2113 | verbosity = "--quiet"; | |
2114 | } | |
3bd1e081 MD |
2115 | switch (consumer_data->type) { |
2116 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2117 | /* |
c7704d57 DG |
2118 | * Find out which consumerd to execute. We will first try the |
2119 | * 64-bit path, then the sessiond's installation directory, and | |
2120 | * fallback on the 32-bit one, | |
94c55f17 | 2121 | */ |
63a799e8 AM |
2122 | DBG3("Looking for a kernel consumer at these locations:"); |
2123 | DBG3(" 1) %s", consumerd64_bin); | |
2124 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2125 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2126 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2127 | DBG3("Found location #1"); |
94c55f17 | 2128 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2129 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2130 | DBG3("Found location #2"); |
94c55f17 | 2131 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2132 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2133 | DBG3("Found location #3"); |
eb1e0bd4 | 2134 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2135 | } else { |
63a799e8 | 2136 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
2137 | break; |
2138 | } | |
2139 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
2140 | execl(consumer_to_use, | |
2141 | "lttng-consumerd", verbosity, "-k", | |
2142 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2143 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2144 | "--group", tracing_group_name, |
94c55f17 | 2145 | NULL); |
3bd1e081 | 2146 | break; |
7753dea8 MD |
2147 | case LTTNG_CONSUMER64_UST: |
2148 | { | |
b1e0b6b6 | 2149 | char *tmpnew = NULL; |
8f4905da MD |
2150 | |
2151 | if (consumerd64_libdir[0] != '\0') { | |
2152 | char *tmp; | |
2153 | size_t tmplen; | |
2154 | ||
2155 | tmp = getenv("LD_LIBRARY_PATH"); | |
2156 | if (!tmp) { | |
2157 | tmp = ""; | |
2158 | } | |
2159 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2160 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2161 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2162 | if (!tmpnew) { | |
2163 | ret = -ENOMEM; | |
2164 | goto error; | |
2165 | } | |
2166 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2167 | strcat(tmpnew, consumerd64_libdir); | |
2168 | if (tmp[0] != '\0') { | |
2169 | strcat(tmpnew, ":"); | |
2170 | strcat(tmpnew, tmp); | |
2171 | } | |
2172 | ret = putenv(tmpnew); | |
2173 | if (ret) { | |
2174 | ret = -errno; | |
c6f76da9 | 2175 | free(tmpnew); |
8f4905da MD |
2176 | goto error; |
2177 | } | |
2178 | } | |
94c55f17 | 2179 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2180 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2181 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2182 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2183 | "--group", tracing_group_name, |
7753dea8 | 2184 | NULL); |
8f4905da MD |
2185 | if (consumerd64_libdir[0] != '\0') { |
2186 | free(tmpnew); | |
2187 | } | |
2188 | if (ret) { | |
2189 | goto error; | |
2190 | } | |
3bd1e081 | 2191 | break; |
7753dea8 MD |
2192 | } |
2193 | case LTTNG_CONSUMER32_UST: | |
2194 | { | |
937dde8e | 2195 | char *tmpnew = NULL; |
8f4905da MD |
2196 | |
2197 | if (consumerd32_libdir[0] != '\0') { | |
2198 | char *tmp; | |
2199 | size_t tmplen; | |
2200 | ||
2201 | tmp = getenv("LD_LIBRARY_PATH"); | |
2202 | if (!tmp) { | |
2203 | tmp = ""; | |
2204 | } | |
2205 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2206 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2207 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2208 | if (!tmpnew) { | |
2209 | ret = -ENOMEM; | |
2210 | goto error; | |
2211 | } | |
2212 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2213 | strcat(tmpnew, consumerd32_libdir); | |
2214 | if (tmp[0] != '\0') { | |
2215 | strcat(tmpnew, ":"); | |
2216 | strcat(tmpnew, tmp); | |
2217 | } | |
2218 | ret = putenv(tmpnew); | |
2219 | if (ret) { | |
2220 | ret = -errno; | |
c6f76da9 | 2221 | free(tmpnew); |
8f4905da MD |
2222 | goto error; |
2223 | } | |
2224 | } | |
94c55f17 | 2225 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2226 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2227 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2228 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2229 | "--group", tracing_group_name, |
7753dea8 | 2230 | NULL); |
8f4905da MD |
2231 | if (consumerd32_libdir[0] != '\0') { |
2232 | free(tmpnew); | |
2233 | } | |
2234 | if (ret) { | |
2235 | goto error; | |
2236 | } | |
7753dea8 MD |
2237 | break; |
2238 | } | |
3bd1e081 | 2239 | default: |
76d7553f | 2240 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2241 | exit(EXIT_FAILURE); |
2242 | } | |
8c0faa1d | 2243 | if (errno != 0) { |
76d7553f | 2244 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
2245 | } |
2246 | exit(EXIT_FAILURE); | |
2247 | } else if (pid > 0) { | |
2248 | ret = pid; | |
8c0faa1d | 2249 | } else { |
76d7553f | 2250 | PERROR("start consumer fork"); |
8c0faa1d | 2251 | ret = -errno; |
8c0faa1d | 2252 | } |
8f4905da | 2253 | error: |
8c0faa1d DG |
2254 | return ret; |
2255 | } | |
2256 | ||
693bd40b | 2257 | /* |
3bd1e081 | 2258 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2259 | */ |
3bd1e081 | 2260 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2261 | { |
c617c0c6 | 2262 | int ret; |
edb8b045 DG |
2263 | |
2264 | /* | |
2265 | * Set the listen() state on the socket since there is a possible race | |
2266 | * between the exec() of the consumer daemon and this call if place in the | |
2267 | * consumer thread. See bug #366 for more details. | |
2268 | */ | |
2269 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2270 | if (ret < 0) { | |
2271 | goto error; | |
2272 | } | |
693bd40b | 2273 | |
3bd1e081 MD |
2274 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2275 | if (consumer_data->pid != 0) { | |
2276 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2277 | goto end; |
2278 | } | |
693bd40b | 2279 | |
3bd1e081 | 2280 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2281 | if (ret < 0) { |
3bd1e081 MD |
2282 | ERR("Spawning consumerd failed"); |
2283 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2284 | goto error; |
693bd40b | 2285 | } |
c49dc785 | 2286 | |
3bd1e081 MD |
2287 | /* Setting up the consumer_data pid */ |
2288 | consumer_data->pid = ret; | |
48842b30 | 2289 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2290 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2291 | |
3bd1e081 MD |
2292 | DBG2("Spawning consumer control thread"); |
2293 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2294 | if (ret < 0) { |
3bd1e081 | 2295 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2296 | goto error; |
2297 | } | |
2298 | ||
c49dc785 | 2299 | end: |
693bd40b DG |
2300 | return 0; |
2301 | ||
2302 | error: | |
331744e3 | 2303 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2304 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2305 | int err; |
2306 | ||
edb8b045 DG |
2307 | err = close(consumer_data->err_sock); |
2308 | if (err < 0) { | |
2309 | PERROR("close consumer data error socket"); | |
2310 | } | |
2311 | } | |
693bd40b DG |
2312 | return ret; |
2313 | } | |
2314 | ||
b73401da | 2315 | /* |
096102bd | 2316 | * Setup necessary data for kernel tracer action. |
b73401da | 2317 | */ |
096102bd | 2318 | static int init_kernel_tracer(void) |
b73401da DG |
2319 | { |
2320 | int ret; | |
b73401da | 2321 | |
096102bd DG |
2322 | /* Modprobe lttng kernel modules */ |
2323 | ret = modprobe_lttng_control(); | |
b73401da | 2324 | if (ret < 0) { |
b73401da DG |
2325 | goto error; |
2326 | } | |
2327 | ||
096102bd DG |
2328 | /* Open debugfs lttng */ |
2329 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2330 | if (kernel_tracer_fd < 0) { | |
2331 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2332 | ret = -1; |
2333 | goto error_open; | |
54d01ffb DG |
2334 | } |
2335 | ||
2f77fc4b DG |
2336 | /* Validate kernel version */ |
2337 | ret = kernel_validate_version(kernel_tracer_fd); | |
2338 | if (ret < 0) { | |
2339 | goto error_version; | |
b551a063 | 2340 | } |
54d01ffb | 2341 | |
2f77fc4b DG |
2342 | ret = modprobe_lttng_data(); |
2343 | if (ret < 0) { | |
2344 | goto error_modules; | |
54d01ffb DG |
2345 | } |
2346 | ||
2f77fc4b DG |
2347 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2348 | return 0; | |
2349 | ||
2350 | error_version: | |
2351 | modprobe_remove_lttng_control(); | |
2352 | ret = close(kernel_tracer_fd); | |
2353 | if (ret) { | |
2354 | PERROR("close"); | |
b551a063 | 2355 | } |
2f77fc4b | 2356 | kernel_tracer_fd = -1; |
f73fabfd | 2357 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2358 | |
2f77fc4b DG |
2359 | error_modules: |
2360 | ret = close(kernel_tracer_fd); | |
2361 | if (ret) { | |
2362 | PERROR("close"); | |
b551a063 | 2363 | } |
54d01ffb | 2364 | |
2f77fc4b DG |
2365 | error_open: |
2366 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2367 | |
2368 | error: | |
2f77fc4b DG |
2369 | WARN("No kernel tracer available"); |
2370 | kernel_tracer_fd = -1; | |
2371 | if (!is_root) { | |
f73fabfd | 2372 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2373 | } else { |
f73fabfd | 2374 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2375 | } |
54d01ffb DG |
2376 | } |
2377 | ||
2f77fc4b | 2378 | |
54d01ffb | 2379 | /* |
2f77fc4b DG |
2380 | * Copy consumer output from the tracing session to the domain session. The |
2381 | * function also applies the right modification on a per domain basis for the | |
2382 | * trace files destination directory. | |
36b588ed MD |
2383 | * |
2384 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2385 | */ |
2f77fc4b | 2386 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2387 | { |
2388 | int ret; | |
2f77fc4b DG |
2389 | const char *dir_name; |
2390 | struct consumer_output *consumer; | |
2391 | ||
2392 | assert(session); | |
2393 | assert(session->consumer); | |
54d01ffb | 2394 | |
b551a063 DG |
2395 | switch (domain) { |
2396 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2397 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2398 | /* |
2399 | * XXX: We should audit the session creation and what this function | |
2400 | * does "extra" in order to avoid a destroy since this function is used | |
2401 | * in the domain session creation (kernel and ust) only. Same for UST | |
2402 | * domain. | |
2403 | */ | |
2404 | if (session->kernel_session->consumer) { | |
2405 | consumer_destroy_output(session->kernel_session->consumer); | |
2406 | } | |
2f77fc4b DG |
2407 | session->kernel_session->consumer = |
2408 | consumer_copy_output(session->consumer); | |
2409 | /* Ease our life a bit for the next part */ | |
2410 | consumer = session->kernel_session->consumer; | |
2411 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2412 | break; |
2413 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2414 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2415 | if (session->ust_session->consumer) { |
2416 | consumer_destroy_output(session->ust_session->consumer); | |
2417 | } | |
2f77fc4b DG |
2418 | session->ust_session->consumer = |
2419 | consumer_copy_output(session->consumer); | |
2420 | /* Ease our life a bit for the next part */ | |
2421 | consumer = session->ust_session->consumer; | |
2422 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2423 | break; |
2424 | default: | |
f73fabfd | 2425 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2426 | goto error; |
2427 | } | |
2428 | ||
2f77fc4b | 2429 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2430 | strncat(consumer->subdir, dir_name, |
2431 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2432 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2433 | ||
f73fabfd | 2434 | ret = LTTNG_OK; |
54d01ffb DG |
2435 | |
2436 | error: | |
2437 | return ret; | |
2438 | } | |
2439 | ||
00e2e675 | 2440 | /* |
2f77fc4b | 2441 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2442 | * |
2443 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2444 | */ |
2f77fc4b DG |
2445 | static int create_ust_session(struct ltt_session *session, |
2446 | struct lttng_domain *domain) | |
00e2e675 DG |
2447 | { |
2448 | int ret; | |
2f77fc4b | 2449 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2450 | |
a4b92340 | 2451 | assert(session); |
2f77fc4b DG |
2452 | assert(domain); |
2453 | assert(session->consumer); | |
a4b92340 | 2454 | |
2f77fc4b DG |
2455 | switch (domain->type) { |
2456 | case LTTNG_DOMAIN_UST: | |
2457 | break; | |
2458 | default: | |
2459 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2460 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2461 | goto error; |
2462 | } | |
2463 | ||
2f77fc4b DG |
2464 | DBG("Creating UST session"); |
2465 | ||
dec56f6c | 2466 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2467 | if (lus == NULL) { |
f73fabfd | 2468 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2469 | goto error; |
2470 | } | |
2471 | ||
2f77fc4b DG |
2472 | lus->uid = session->uid; |
2473 | lus->gid = session->gid; | |
2bba9e53 | 2474 | lus->output_traces = session->output_traces; |
27babd3a | 2475 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2476 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2477 | session->ust_session = lus; |
00e2e675 | 2478 | |
2f77fc4b DG |
2479 | /* Copy session output to the newly created UST session */ |
2480 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2481 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2482 | goto error; |
2483 | } | |
2484 | ||
f73fabfd | 2485 | return LTTNG_OK; |
00e2e675 DG |
2486 | |
2487 | error: | |
2f77fc4b DG |
2488 | free(lus); |
2489 | session->ust_session = NULL; | |
00e2e675 DG |
2490 | return ret; |
2491 | } | |
2492 | ||
2493 | /* | |
2f77fc4b | 2494 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2495 | */ |
2f77fc4b | 2496 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2497 | { |
2498 | int ret; | |
a4b92340 | 2499 | |
2f77fc4b | 2500 | DBG("Creating kernel session"); |
00e2e675 | 2501 | |
2f77fc4b DG |
2502 | ret = kernel_create_session(session, kernel_tracer_fd); |
2503 | if (ret < 0) { | |
f73fabfd | 2504 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2505 | goto error; |
2506 | } | |
2507 | ||
2f77fc4b DG |
2508 | /* Code flow safety */ |
2509 | assert(session->kernel_session); | |
2510 | ||
2511 | /* Copy session output to the newly created Kernel session */ | |
2512 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2513 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2514 | goto error; |
2515 | } | |
2516 | ||
2f77fc4b DG |
2517 | /* Create directory(ies) on local filesystem. */ |
2518 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2519 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2520 | ret = run_as_mkdir_recursive( | |
2521 | session->kernel_session->consumer->dst.trace_path, | |
2522 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2523 | if (ret < 0) { | |
2524 | if (ret != -EEXIST) { | |
2525 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2526 | goto error; |
2527 | } | |
00e2e675 | 2528 | } |
2f77fc4b | 2529 | } |
00e2e675 | 2530 | |
2f77fc4b DG |
2531 | session->kernel_session->uid = session->uid; |
2532 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2533 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2534 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2535 | |
f73fabfd | 2536 | return LTTNG_OK; |
00e2e675 | 2537 | |
2f77fc4b DG |
2538 | error: |
2539 | trace_kernel_destroy_session(session->kernel_session); | |
2540 | session->kernel_session = NULL; | |
2541 | return ret; | |
2542 | } | |
00e2e675 | 2543 | |
2f77fc4b DG |
2544 | /* |
2545 | * Count number of session permitted by uid/gid. | |
2546 | */ | |
2547 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2548 | { | |
2549 | unsigned int i = 0; | |
2550 | struct ltt_session *session; | |
07424f16 | 2551 | |
2f77fc4b DG |
2552 | DBG("Counting number of available session for UID %d GID %d", |
2553 | uid, gid); | |
2554 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2555 | /* |
2f77fc4b | 2556 | * Only list the sessions the user can control. |
00e2e675 | 2557 | */ |
2f77fc4b DG |
2558 | if (!session_access_ok(session, uid, gid)) { |
2559 | continue; | |
2560 | } | |
2561 | i++; | |
a4b92340 | 2562 | } |
2f77fc4b | 2563 | return i; |
00e2e675 DG |
2564 | } |
2565 | ||
54d01ffb DG |
2566 | /* |
2567 | * Process the command requested by the lttng client within the command | |
2568 | * context structure. This function make sure that the return structure (llm) | |
2569 | * is set and ready for transmission before returning. | |
2570 | * | |
2571 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2572 | * |
2573 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2574 | * |
2575 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2576 | */ |
53a80697 MD |
2577 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2578 | int *sock_error) | |
54d01ffb | 2579 | { |
f73fabfd | 2580 | int ret = LTTNG_OK; |
44d3bd01 | 2581 | int need_tracing_session = 1; |
2e09ba09 | 2582 | int need_domain; |
54d01ffb DG |
2583 | |
2584 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2585 | ||
53a80697 MD |
2586 | *sock_error = 0; |
2587 | ||
2e09ba09 MD |
2588 | switch (cmd_ctx->lsm->cmd_type) { |
2589 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2590 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2591 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
2592 | case LTTNG_DESTROY_SESSION: |
2593 | case LTTNG_LIST_SESSIONS: | |
2594 | case LTTNG_LIST_DOMAINS: | |
2595 | case LTTNG_START_TRACE: | |
2596 | case LTTNG_STOP_TRACE: | |
6d805429 | 2597 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2598 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2599 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2600 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2601 | case LTTNG_SNAPSHOT_RECORD: | |
2e09ba09 | 2602 | need_domain = 0; |
3aace903 | 2603 | break; |
2e09ba09 MD |
2604 | default: |
2605 | need_domain = 1; | |
2606 | } | |
2607 | ||
2608 | if (opt_no_kernel && need_domain | |
2609 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2610 | if (!is_root) { |
f73fabfd | 2611 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2612 | } else { |
f73fabfd | 2613 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2614 | } |
4fba7219 DG |
2615 | goto error; |
2616 | } | |
2617 | ||
8d3113b2 DG |
2618 | /* Deny register consumer if we already have a spawned consumer. */ |
2619 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2620 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2621 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2622 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2623 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2624 | goto error; |
2625 | } | |
2626 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2627 | } | |
2628 | ||
54d01ffb DG |
2629 | /* |
2630 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2631 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2632 | * command. |
2633 | */ | |
2634 | switch(cmd_ctx->lsm->cmd_type) { | |
2635 | case LTTNG_LIST_SESSIONS: | |
2636 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2637 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2638 | case LTTNG_LIST_DOMAINS: |
2639 | case LTTNG_LIST_CHANNELS: | |
2640 | case LTTNG_LIST_EVENTS: | |
2641 | break; | |
2642 | default: | |
2643 | /* Setup lttng message with no payload */ | |
2644 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2645 | if (ret < 0) { | |
2646 | /* This label does not try to unlock the session */ | |
2647 | goto init_setup_error; | |
2648 | } | |
2649 | } | |
2650 | ||
2651 | /* Commands that DO NOT need a session. */ | |
2652 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2653 | case LTTNG_CREATE_SESSION: |
27babd3a | 2654 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2655 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 | 2656 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2657 | case LTTNG_LIST_SESSIONS: |
2658 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2659 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2660 | need_tracing_session = 0; |
54d01ffb DG |
2661 | break; |
2662 | default: | |
2663 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2664 | /* |
2665 | * We keep the session list lock across _all_ commands | |
2666 | * for now, because the per-session lock does not | |
2667 | * handle teardown properly. | |
2668 | */ | |
74babd95 | 2669 | session_lock_list(); |
54d01ffb DG |
2670 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2671 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2672 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2673 | goto error; |
2674 | } else { | |
2675 | /* Acquire lock for the session */ | |
2676 | session_lock(cmd_ctx->session); | |
2677 | } | |
2678 | break; | |
2679 | } | |
b389abbe | 2680 | |
2e09ba09 MD |
2681 | if (!need_domain) { |
2682 | goto skip_domain; | |
2683 | } | |
a4b92340 | 2684 | |
54d01ffb DG |
2685 | /* |
2686 | * Check domain type for specific "pre-action". | |
2687 | */ | |
2688 | switch (cmd_ctx->lsm->domain.type) { | |
2689 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2690 | if (!is_root) { |
f73fabfd | 2691 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2692 | goto error; |
2693 | } | |
2694 | ||
54d01ffb | 2695 | /* Kernel tracer check */ |
a4b35e07 | 2696 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2697 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2698 | ret = init_kernel_tracer(); |
2699 | if (ret != 0) { | |
54d01ffb DG |
2700 | goto error; |
2701 | } | |
2702 | } | |
5eb91c98 | 2703 | |
5c827ce0 DG |
2704 | /* Consumer is in an ERROR state. Report back to client */ |
2705 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2706 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2707 | goto error; |
2708 | } | |
2709 | ||
54d01ffb | 2710 | /* Need a session for kernel command */ |
44d3bd01 | 2711 | if (need_tracing_session) { |
54d01ffb | 2712 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2713 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2714 | if (ret < 0) { |
f73fabfd | 2715 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2716 | goto error; |
2717 | } | |
b389abbe | 2718 | } |
7d29a247 | 2719 | |
54d01ffb | 2720 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2721 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2722 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2723 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2724 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2725 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2726 | if (ret < 0) { |
f73fabfd | 2727 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2728 | goto error; |
950131af | 2729 | } |
5c827ce0 | 2730 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2731 | } else { |
2732 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2733 | } |
173af62f | 2734 | |
a4b92340 DG |
2735 | /* |
2736 | * The consumer was just spawned so we need to add the socket to | |
2737 | * the consumer output of the session if exist. | |
2738 | */ | |
2739 | ret = consumer_create_socket(&kconsumer_data, | |
2740 | cmd_ctx->session->kernel_session->consumer); | |
2741 | if (ret < 0) { | |
2742 | goto error; | |
173af62f | 2743 | } |
0d0c377a | 2744 | } |
5c827ce0 | 2745 | |
54d01ffb | 2746 | break; |
2bdd86d4 | 2747 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2748 | { |
b51ec5b4 MD |
2749 | if (!ust_app_supported()) { |
2750 | ret = LTTNG_ERR_NO_UST; | |
2751 | goto error; | |
2752 | } | |
5c827ce0 DG |
2753 | /* Consumer is in an ERROR state. Report back to client */ |
2754 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2755 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2756 | goto error; |
2757 | } | |
2758 | ||
44d3bd01 | 2759 | if (need_tracing_session) { |
a4b92340 | 2760 | /* Create UST session if none exist. */ |
f6a9efaa | 2761 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2762 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2763 | &cmd_ctx->lsm->domain); |
f73fabfd | 2764 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2765 | goto error; |
2766 | } | |
2767 | } | |
00e2e675 | 2768 | |
7753dea8 MD |
2769 | /* Start the UST consumer daemons */ |
2770 | /* 64-bit */ | |
2771 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2772 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2773 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2774 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2775 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2776 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2777 | if (ret < 0) { |
f73fabfd | 2778 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2779 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2780 | goto error; |
2781 | } | |
48842b30 | 2782 | |
173af62f | 2783 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2784 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2785 | } else { |
7753dea8 MD |
2786 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2787 | } | |
173af62f DG |
2788 | |
2789 | /* | |
2790 | * Setup socket for consumer 64 bit. No need for atomic access | |
2791 | * since it was set above and can ONLY be set in this thread. | |
2792 | */ | |
a4b92340 DG |
2793 | ret = consumer_create_socket(&ustconsumer64_data, |
2794 | cmd_ctx->session->ust_session->consumer); | |
2795 | if (ret < 0) { | |
2796 | goto error; | |
173af62f DG |
2797 | } |
2798 | ||
7753dea8 | 2799 | /* 32-bit */ |
fc7a59ce | 2800 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2801 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2802 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2803 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2804 | ret = start_consumerd(&ustconsumer32_data); | |
2805 | if (ret < 0) { | |
f73fabfd | 2806 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2807 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2808 | goto error; |
2809 | } | |
5c827ce0 | 2810 | |
173af62f | 2811 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2812 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2813 | } else { |
2814 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2815 | } |
173af62f DG |
2816 | |
2817 | /* | |
2818 | * Setup socket for consumer 64 bit. No need for atomic access | |
2819 | * since it was set above and can ONLY be set in this thread. | |
2820 | */ | |
a4b92340 DG |
2821 | ret = consumer_create_socket(&ustconsumer32_data, |
2822 | cmd_ctx->session->ust_session->consumer); | |
2823 | if (ret < 0) { | |
2824 | goto error; | |
173af62f | 2825 | } |
44d3bd01 DG |
2826 | } |
2827 | break; | |
48842b30 | 2828 | } |
54d01ffb | 2829 | default: |
54d01ffb DG |
2830 | break; |
2831 | } | |
2e09ba09 | 2832 | skip_domain: |
33a2b854 | 2833 | |
5c827ce0 DG |
2834 | /* Validate consumer daemon state when start/stop trace command */ |
2835 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2836 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2837 | switch (cmd_ctx->lsm->domain.type) { | |
2838 | case LTTNG_DOMAIN_UST: | |
2839 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2840 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2841 | goto error; |
2842 | } | |
2843 | break; | |
2844 | case LTTNG_DOMAIN_KERNEL: | |
2845 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2846 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2847 | goto error; |
2848 | } | |
2849 | break; | |
2850 | } | |
2851 | } | |
2852 | ||
8e0af1b4 MD |
2853 | /* |
2854 | * Check that the UID or GID match that of the tracing session. | |
2855 | * The root user can interact with all sessions. | |
2856 | */ | |
2857 | if (need_tracing_session) { | |
2858 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2859 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2860 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2861 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2862 | goto error; |
2863 | } | |
2864 | } | |
2865 | ||
ffe60014 DG |
2866 | /* |
2867 | * Send relayd information to consumer as soon as we have a domain and a | |
2868 | * session defined. | |
2869 | */ | |
2870 | if (cmd_ctx->session && need_domain) { | |
2871 | /* | |
2872 | * Setup relayd if not done yet. If the relayd information was already | |
2873 | * sent to the consumer, this call will gracefully return. | |
2874 | */ | |
2875 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2876 | if (ret != LTTNG_OK) { | |
2877 | goto error; | |
2878 | } | |
2879 | } | |
2880 | ||
54d01ffb DG |
2881 | /* Process by command type */ |
2882 | switch (cmd_ctx->lsm->cmd_type) { | |
2883 | case LTTNG_ADD_CONTEXT: | |
2884 | { | |
2885 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2886 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2887 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2888 | break; |
2889 | } | |
2890 | case LTTNG_DISABLE_CHANNEL: | |
2891 | { | |
2892 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2893 | cmd_ctx->lsm->u.disable.channel_name); | |
2894 | break; | |
2895 | } | |
2896 | case LTTNG_DISABLE_EVENT: | |
2897 | { | |
2898 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2899 | cmd_ctx->lsm->u.disable.channel_name, | |
2900 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2901 | break; |
2902 | } | |
54d01ffb DG |
2903 | case LTTNG_DISABLE_ALL_EVENT: |
2904 | { | |
2bdd86d4 | 2905 | DBG("Disabling all events"); |
54d01ffb DG |
2906 | |
2907 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2908 | cmd_ctx->lsm->u.disable.channel_name); | |
2909 | break; | |
2910 | } | |
2911 | case LTTNG_ENABLE_CHANNEL: | |
2912 | { | |
7972aab2 | 2913 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 2914 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2915 | break; |
2916 | } | |
2917 | case LTTNG_ENABLE_EVENT: | |
2918 | { | |
7972aab2 | 2919 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb | 2920 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2921 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2922 | break; |
2923 | } | |
2924 | case LTTNG_ENABLE_ALL_EVENT: | |
2925 | { | |
2bdd86d4 | 2926 | DBG("Enabling all events"); |
54d01ffb | 2927 | |
7972aab2 | 2928 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 2929 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2930 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2931 | break; |
2932 | } | |
052da939 | 2933 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2934 | { |
9f19cc17 | 2935 | struct lttng_event *events; |
54d01ffb | 2936 | ssize_t nb_events; |
052da939 | 2937 | |
54d01ffb DG |
2938 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2939 | if (nb_events < 0) { | |
f73fabfd | 2940 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2941 | ret = -nb_events; |
2942 | goto error; | |
2ef84c95 DG |
2943 | } |
2944 | ||
2945 | /* | |
2946 | * Setup lttng message with payload size set to the event list size in | |
2947 | * bytes and then copy list into the llm payload. | |
2948 | */ | |
052da939 | 2949 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2950 | if (ret < 0) { |
052da939 | 2951 | free(events); |
2ef84c95 DG |
2952 | goto setup_error; |
2953 | } | |
2954 | ||
2955 | /* Copy event list into message payload */ | |
9f19cc17 | 2956 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2957 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2958 | |
9f19cc17 | 2959 | free(events); |
2ef84c95 | 2960 | |
f73fabfd | 2961 | ret = LTTNG_OK; |
2ef84c95 DG |
2962 | break; |
2963 | } | |
f37d259d MD |
2964 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2965 | { | |
2966 | struct lttng_event_field *fields; | |
2967 | ssize_t nb_fields; | |
2968 | ||
a4b92340 DG |
2969 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2970 | &fields); | |
f37d259d | 2971 | if (nb_fields < 0) { |
f73fabfd | 2972 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2973 | ret = -nb_fields; |
2974 | goto error; | |
2975 | } | |
2976 | ||
2977 | /* | |
2978 | * Setup lttng message with payload size set to the event list size in | |
2979 | * bytes and then copy list into the llm payload. | |
2980 | */ | |
a4b92340 DG |
2981 | ret = setup_lttng_msg(cmd_ctx, |
2982 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2983 | if (ret < 0) { |
2984 | free(fields); | |
2985 | goto setup_error; | |
2986 | } | |
2987 | ||
2988 | /* Copy event list into message payload */ | |
2989 | memcpy(cmd_ctx->llm->payload, fields, | |
2990 | sizeof(struct lttng_event_field) * nb_fields); | |
2991 | ||
2992 | free(fields); | |
2993 | ||
f73fabfd | 2994 | ret = LTTNG_OK; |
f37d259d MD |
2995 | break; |
2996 | } | |
00e2e675 DG |
2997 | case LTTNG_SET_CONSUMER_URI: |
2998 | { | |
a4b92340 DG |
2999 | size_t nb_uri, len; |
3000 | struct lttng_uri *uris; | |
3001 | ||
3002 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3003 | len = nb_uri * sizeof(struct lttng_uri); | |
3004 | ||
3005 | if (nb_uri == 0) { | |
f73fabfd | 3006 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3007 | goto error; |
3008 | } | |
3009 | ||
3010 | uris = zmalloc(len); | |
3011 | if (uris == NULL) { | |
f73fabfd | 3012 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3013 | goto error; |
3014 | } | |
3015 | ||
3016 | /* Receive variable len data */ | |
77c7c900 | 3017 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3018 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3019 | if (ret <= 0) { | |
3020 | DBG("No URIs received from client... continuing"); | |
3021 | *sock_error = 1; | |
f73fabfd | 3022 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3023 | free(uris); |
a4b92340 DG |
3024 | goto error; |
3025 | } | |
3026 | ||
00e2e675 | 3027 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 3028 | nb_uri, uris); |
f73fabfd | 3029 | if (ret != LTTNG_OK) { |
b1d41407 | 3030 | free(uris); |
a4b92340 DG |
3031 | goto error; |
3032 | } | |
3033 | ||
3034 | /* | |
3035 | * XXX: 0 means that this URI should be applied on the session. Should | |
3036 | * be a DOMAIN enuam. | |
3037 | */ | |
3038 | if (cmd_ctx->lsm->domain.type == 0) { | |
3039 | /* Add the URI for the UST session if a consumer is present. */ | |
3040 | if (cmd_ctx->session->ust_session && | |
3041 | cmd_ctx->session->ust_session->consumer) { | |
3042 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
3043 | nb_uri, uris); | |
3044 | } else if (cmd_ctx->session->kernel_session && | |
3045 | cmd_ctx->session->kernel_session->consumer) { | |
3046 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
3047 | cmd_ctx->session, nb_uri, uris); | |
3048 | } | |
3049 | } | |
3050 | ||
b1d41407 DG |
3051 | free(uris); |
3052 | ||
00e2e675 DG |
3053 | break; |
3054 | } | |
f3ed775e | 3055 | case LTTNG_START_TRACE: |
8c0faa1d | 3056 | { |
54d01ffb | 3057 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3058 | break; |
3059 | } | |
f3ed775e | 3060 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3061 | { |
54d01ffb | 3062 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3063 | break; |
3064 | } | |
5e16da05 MD |
3065 | case LTTNG_CREATE_SESSION: |
3066 | { | |
a4b92340 DG |
3067 | size_t nb_uri, len; |
3068 | struct lttng_uri *uris = NULL; | |
3069 | ||
3070 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3071 | len = nb_uri * sizeof(struct lttng_uri); | |
3072 | ||
3073 | if (nb_uri > 0) { | |
3074 | uris = zmalloc(len); | |
3075 | if (uris == NULL) { | |
f73fabfd | 3076 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3077 | goto error; |
3078 | } | |
3079 | ||
3080 | /* Receive variable len data */ | |
77c7c900 | 3081 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3082 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3083 | if (ret <= 0) { | |
3084 | DBG("No URIs received from client... continuing"); | |
3085 | *sock_error = 1; | |
f73fabfd | 3086 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3087 | free(uris); |
a4b92340 DG |
3088 | goto error; |
3089 | } | |
3090 | ||
3091 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3092 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3093 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3094 | free(uris); |
a4b92340 DG |
3095 | goto error; |
3096 | } | |
3097 | } | |
3098 | ||
3099 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3100 | &cmd_ctx->creds, 0); |
a4b92340 | 3101 | |
b1d41407 DG |
3102 | free(uris); |
3103 | ||
00e2e675 DG |
3104 | break; |
3105 | } | |
5e16da05 MD |
3106 | case LTTNG_DESTROY_SESSION: |
3107 | { | |
2f77fc4b | 3108 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3109 | |
3110 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3111 | cmd_ctx->session = NULL; |
5461b305 | 3112 | break; |
5e16da05 | 3113 | } |
9f19cc17 | 3114 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3115 | { |
54d01ffb DG |
3116 | ssize_t nb_dom; |
3117 | struct lttng_domain *domains; | |
5461b305 | 3118 | |
54d01ffb DG |
3119 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3120 | if (nb_dom < 0) { | |
f73fabfd | 3121 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3122 | ret = -nb_dom; |
3123 | goto error; | |
ce3d728c | 3124 | } |
520ff687 | 3125 | |
54d01ffb | 3126 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3127 | if (ret < 0) { |
ae9c20bc | 3128 | free(domains); |
5461b305 | 3129 | goto setup_error; |
520ff687 | 3130 | } |
57167058 | 3131 | |
54d01ffb DG |
3132 | /* Copy event list into message payload */ |
3133 | memcpy(cmd_ctx->llm->payload, domains, | |
3134 | nb_dom * sizeof(struct lttng_domain)); | |
3135 | ||
3136 | free(domains); | |
5e16da05 | 3137 | |
f73fabfd | 3138 | ret = LTTNG_OK; |
5e16da05 MD |
3139 | break; |
3140 | } | |
9f19cc17 | 3141 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3142 | { |
6775595e | 3143 | int nb_chan; |
54d01ffb DG |
3144 | struct lttng_channel *channels; |
3145 | ||
b551a063 DG |
3146 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3147 | cmd_ctx->session, &channels); | |
54d01ffb | 3148 | if (nb_chan < 0) { |
f73fabfd | 3149 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3150 | ret = -nb_chan; |
3151 | goto error; | |
5461b305 | 3152 | } |
ca95a216 | 3153 | |
54d01ffb | 3154 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3155 | if (ret < 0) { |
ae9c20bc | 3156 | free(channels); |
5461b305 DG |
3157 | goto setup_error; |
3158 | } | |
9f19cc17 | 3159 | |
54d01ffb DG |
3160 | /* Copy event list into message payload */ |
3161 | memcpy(cmd_ctx->llm->payload, channels, | |
3162 | nb_chan * sizeof(struct lttng_channel)); | |
3163 | ||
3164 | free(channels); | |
9f19cc17 | 3165 | |
f73fabfd | 3166 | ret = LTTNG_OK; |
5461b305 | 3167 | break; |
5e16da05 | 3168 | } |
9f19cc17 | 3169 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3170 | { |
b551a063 | 3171 | ssize_t nb_event; |
684d34d2 | 3172 | struct lttng_event *events = NULL; |
9f19cc17 | 3173 | |
b551a063 | 3174 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3175 | cmd_ctx->lsm->u.list.channel_name, &events); |
3176 | if (nb_event < 0) { | |
f73fabfd | 3177 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3178 | ret = -nb_event; |
3179 | goto error; | |
5461b305 | 3180 | } |
ca95a216 | 3181 | |
54d01ffb | 3182 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3183 | if (ret < 0) { |
ae9c20bc | 3184 | free(events); |
5461b305 DG |
3185 | goto setup_error; |
3186 | } | |
9f19cc17 | 3187 | |
54d01ffb DG |
3188 | /* Copy event list into message payload */ |
3189 | memcpy(cmd_ctx->llm->payload, events, | |
3190 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3191 | |
54d01ffb | 3192 | free(events); |
9f19cc17 | 3193 | |
f73fabfd | 3194 | ret = LTTNG_OK; |
5461b305 | 3195 | break; |
5e16da05 MD |
3196 | } |
3197 | case LTTNG_LIST_SESSIONS: | |
3198 | { | |
8e0af1b4 | 3199 | unsigned int nr_sessions; |
5461b305 | 3200 | |
8e0af1b4 | 3201 | session_lock_list(); |
730389d9 DG |
3202 | nr_sessions = lttng_sessions_count( |
3203 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3204 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3205 | |
8e0af1b4 | 3206 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3207 | if (ret < 0) { |
54d01ffb | 3208 | session_unlock_list(); |
5461b305 | 3209 | goto setup_error; |
e065084a | 3210 | } |
5e16da05 | 3211 | |
6c9cc2ab | 3212 | /* Filled the session array */ |
2f77fc4b | 3213 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3214 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3215 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3216 | |
54d01ffb | 3217 | session_unlock_list(); |
5e16da05 | 3218 | |
f73fabfd | 3219 | ret = LTTNG_OK; |
5e16da05 MD |
3220 | break; |
3221 | } | |
d0254c7c MD |
3222 | case LTTNG_CALIBRATE: |
3223 | { | |
54d01ffb DG |
3224 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3225 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3226 | break; |
3227 | } | |
d9800920 DG |
3228 | case LTTNG_REGISTER_CONSUMER: |
3229 | { | |
2f77fc4b DG |
3230 | struct consumer_data *cdata; |
3231 | ||
3232 | switch (cmd_ctx->lsm->domain.type) { | |
3233 | case LTTNG_DOMAIN_KERNEL: | |
3234 | cdata = &kconsumer_data; | |
3235 | break; | |
3236 | default: | |
f73fabfd | 3237 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3238 | goto error; |
3239 | } | |
3240 | ||
54d01ffb | 3241 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3242 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3243 | break; |
3244 | } | |
025faf73 | 3245 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
3246 | { |
3247 | struct lttng_filter_bytecode *bytecode; | |
3248 | ||
025faf73 | 3249 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 3250 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3251 | goto error; |
3252 | } | |
52df2401 MD |
3253 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
3254 | ret = LTTNG_ERR_FILTER_INVAL; | |
3255 | goto error; | |
3256 | } | |
025faf73 | 3257 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 3258 | if (!bytecode) { |
f73fabfd | 3259 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
3260 | goto error; |
3261 | } | |
3262 | /* Receive var. len. data */ | |
3263 | DBG("Receiving var len data from client ..."); | |
3264 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 3265 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
3266 | if (ret <= 0) { |
3267 | DBG("Nothing recv() from client var len data... continuing"); | |
3268 | *sock_error = 1; | |
f73fabfd | 3269 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3270 | goto error; |
3271 | } | |
3272 | ||
3273 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 3274 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 3275 | free(bytecode); |
f73fabfd | 3276 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3277 | goto error; |
3278 | } | |
3279 | ||
7972aab2 | 3280 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
025faf73 DG |
3281 | cmd_ctx->lsm->u.enable.channel_name, |
3282 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
3283 | break; |
3284 | } | |
6d805429 | 3285 | case LTTNG_DATA_PENDING: |
806e2684 | 3286 | { |
6d805429 | 3287 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3288 | break; |
3289 | } | |
da3c9ec1 DG |
3290 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3291 | { | |
6dc3064a DG |
3292 | struct lttcomm_lttng_output_id reply; |
3293 | ||
3294 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3295 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3296 | if (ret != LTTNG_OK) { | |
3297 | goto error; | |
3298 | } | |
3299 | ||
3300 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3301 | if (ret < 0) { | |
3302 | goto setup_error; | |
3303 | } | |
3304 | ||
3305 | /* Copy output list into message payload */ | |
3306 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3307 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3308 | break; |
3309 | } | |
3310 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3311 | { | |
6dc3064a DG |
3312 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3313 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3314 | break; |
3315 | } | |
3316 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3317 | { | |
6dc3064a DG |
3318 | ssize_t nb_output; |
3319 | struct lttng_snapshot_output *outputs = NULL; | |
3320 | ||
3321 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3322 | if (nb_output < 0) { | |
3323 | ret = -nb_output; | |
3324 | goto error; | |
3325 | } | |
3326 | ||
3327 | ret = setup_lttng_msg(cmd_ctx, | |
3328 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3329 | if (ret < 0) { | |
3330 | free(outputs); | |
3331 | goto setup_error; | |
3332 | } | |
3333 | ||
3334 | if (outputs) { | |
3335 | /* Copy output list into message payload */ | |
3336 | memcpy(cmd_ctx->llm->payload, outputs, | |
3337 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3338 | free(outputs); | |
3339 | } | |
3340 | ||
3341 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3342 | break; |
3343 | } | |
3344 | case LTTNG_SNAPSHOT_RECORD: | |
3345 | { | |
6dc3064a DG |
3346 | ret = cmd_snapshot_record(cmd_ctx->session, |
3347 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3348 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3349 | break; |
3350 | } | |
27babd3a DG |
3351 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3352 | { | |
3353 | size_t nb_uri, len; | |
3354 | struct lttng_uri *uris = NULL; | |
3355 | ||
3356 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3357 | len = nb_uri * sizeof(struct lttng_uri); | |
3358 | ||
3359 | if (nb_uri > 0) { | |
3360 | uris = zmalloc(len); | |
3361 | if (uris == NULL) { | |
3362 | ret = LTTNG_ERR_FATAL; | |
3363 | goto error; | |
3364 | } | |
3365 | ||
3366 | /* Receive variable len data */ | |
3367 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3368 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3369 | if (ret <= 0) { | |
3370 | DBG("No URIs received from client... continuing"); | |
3371 | *sock_error = 1; | |
3372 | ret = LTTNG_ERR_SESSION_FAIL; | |
3373 | free(uris); | |
3374 | goto error; | |
3375 | } | |
3376 | ||
3377 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3378 | DBG("Creating session with ONE network URI is a bad call"); | |
3379 | ret = LTTNG_ERR_SESSION_FAIL; | |
3380 | free(uris); | |
3381 | goto error; | |
3382 | } | |
3383 | } | |
3384 | ||
3385 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3386 | nb_uri, &cmd_ctx->creds); | |
3387 | free(uris); | |
3388 | break; | |
3389 | } | |
ecc48a90 JD |
3390 | case LTTNG_CREATE_SESSION_LIVE: |
3391 | { | |
3392 | size_t nb_uri, len; | |
3393 | struct lttng_uri *uris = NULL; | |
3394 | ||
3395 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3396 | len = nb_uri * sizeof(struct lttng_uri); | |
3397 | ||
3398 | if (nb_uri > 0) { | |
3399 | uris = zmalloc(len); | |
3400 | if (uris == NULL) { | |
3401 | ret = LTTNG_ERR_FATAL; | |
3402 | goto error; | |
3403 | } | |
3404 | ||
3405 | /* Receive variable len data */ | |
3406 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3407 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3408 | if (ret <= 0) { | |
3409 | DBG("No URIs received from client... continuing"); | |
3410 | *sock_error = 1; | |
3411 | ret = LTTNG_ERR_SESSION_FAIL; | |
3412 | free(uris); | |
3413 | goto error; | |
3414 | } | |
3415 | ||
3416 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3417 | DBG("Creating session with ONE network URI is a bad call"); | |
3418 | ret = LTTNG_ERR_SESSION_FAIL; | |
3419 | free(uris); | |
3420 | goto error; | |
3421 | } | |
3422 | } | |
3423 | ||
3424 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
3425 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
3426 | free(uris); | |
3427 | break; | |
3428 | } | |
5e16da05 | 3429 | default: |
f73fabfd | 3430 | ret = LTTNG_ERR_UND; |
5461b305 | 3431 | break; |
fac6795d DG |
3432 | } |
3433 | ||
5461b305 | 3434 | error: |
5461b305 DG |
3435 | if (cmd_ctx->llm == NULL) { |
3436 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3437 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3438 | goto setup_error; |
3439 | } | |
3440 | } | |
54d01ffb | 3441 | /* Set return code */ |
5461b305 | 3442 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3443 | setup_error: |
b5541356 | 3444 | if (cmd_ctx->session) { |
54d01ffb | 3445 | session_unlock(cmd_ctx->session); |
b5541356 | 3446 | } |
256a5576 MD |
3447 | if (need_tracing_session) { |
3448 | session_unlock_list(); | |
3449 | } | |
54d01ffb | 3450 | init_setup_error: |
8028d920 | 3451 | return ret; |
fac6795d DG |
3452 | } |
3453 | ||
44a5e5eb DG |
3454 | /* |
3455 | * Thread managing health check socket. | |
3456 | */ | |
3457 | static void *thread_manage_health(void *data) | |
3458 | { | |
eb4a2943 | 3459 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3460 | uint32_t revents, nb_fd; |
3461 | struct lttng_poll_event events; | |
0c89d795 MD |
3462 | struct health_comm_msg msg; |
3463 | struct health_comm_reply reply; | |
44a5e5eb DG |
3464 | |
3465 | DBG("[thread] Manage health check started"); | |
3466 | ||
3467 | rcu_register_thread(); | |
3468 | ||
6d737ce4 DG |
3469 | /* We might hit an error path before this is created. */ |
3470 | lttng_poll_init(&events); | |
3cc04881 | 3471 | |
44a5e5eb DG |
3472 | /* Create unix socket */ |
3473 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3474 | if (sock < 0) { | |
3475 | ERR("Unable to create health check Unix socket"); | |
3476 | ret = -1; | |
3477 | goto error; | |
3478 | } | |
3479 | ||
6c71277b MD |
3480 | if (is_root) { |
3481 | /* lttng health client socket path permissions */ | |
3482 | ret = chown(health_unix_sock_path, 0, | |
3483 | utils_get_group_id(tracing_group_name)); | |
3484 | if (ret < 0) { | |
3485 | ERR("Unable to set group on %s", health_unix_sock_path); | |
3486 | PERROR("chown"); | |
3487 | ret = -1; | |
3488 | goto error; | |
3489 | } | |
3490 | ||
3491 | ret = chmod(health_unix_sock_path, | |
3492 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3493 | if (ret < 0) { | |
3494 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
3495 | PERROR("chmod"); | |
3496 | ret = -1; | |
3497 | goto error; | |
3498 | } | |
3499 | } | |
3500 | ||
b662582b DG |
3501 | /* |
3502 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3503 | * show must go on. | |
3504 | */ | |
3505 | (void) utils_set_fd_cloexec(sock); | |
3506 | ||
44a5e5eb DG |
3507 | ret = lttcomm_listen_unix_sock(sock); |
3508 | if (ret < 0) { | |
3509 | goto error; | |
3510 | } | |
3511 | ||
3512 | /* | |
3513 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3514 | * more will be added to this poll set. | |
3515 | */ | |
d0b96690 | 3516 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3517 | if (ret < 0) { |
3518 | goto error; | |
3519 | } | |
3520 | ||
3521 | /* Add the application registration socket */ | |
3522 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3523 | if (ret < 0) { | |
3524 | goto error; | |
3525 | } | |
3526 | ||
3527 | while (1) { | |
3528 | DBG("Health check ready"); | |
3529 | ||
44a5e5eb DG |
3530 | /* Inifinite blocking call, waiting for transmission */ |
3531 | restart: | |
3532 | ret = lttng_poll_wait(&events, -1); | |
3533 | if (ret < 0) { | |
3534 | /* | |
3535 | * Restart interrupted system call. | |
3536 | */ | |
3537 | if (errno == EINTR) { | |
3538 | goto restart; | |
3539 | } | |
3540 | goto error; | |
3541 | } | |
3542 | ||
0d9c5d77 DG |
3543 | nb_fd = ret; |
3544 | ||
44a5e5eb DG |
3545 | for (i = 0; i < nb_fd; i++) { |
3546 | /* Fetch once the poll data */ | |
3547 | revents = LTTNG_POLL_GETEV(&events, i); | |
3548 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3549 | ||
3550 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3551 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3552 | if (ret) { |
139ac872 MD |
3553 | err = 0; |
3554 | goto exit; | |
44a5e5eb DG |
3555 | } |
3556 | ||
3557 | /* Event on the registration socket */ | |
3558 | if (pollfd == sock) { | |
3559 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3560 | ERR("Health socket poll error"); | |
3561 | goto error; | |
3562 | } | |
3563 | } | |
3564 | } | |
3565 | ||
3566 | new_sock = lttcomm_accept_unix_sock(sock); | |
3567 | if (new_sock < 0) { | |
3568 | goto error; | |
3569 | } | |
3570 | ||
b662582b DG |
3571 | /* |
3572 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3573 | * show must go on. | |
3574 | */ | |
3575 | (void) utils_set_fd_cloexec(new_sock); | |
3576 | ||
44a5e5eb DG |
3577 | DBG("Receiving data from client for health..."); |
3578 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3579 | if (ret <= 0) { | |
3580 | DBG("Nothing recv() from client... continuing"); | |
3581 | ret = close(new_sock); | |
3582 | if (ret) { | |
3583 | PERROR("close"); | |
3584 | } | |
3585 | new_sock = -1; | |
3586 | continue; | |
3587 | } | |
3588 | ||
3589 | rcu_thread_online(); | |
3590 | ||
6c71277b MD |
3591 | reply.ret_code = 0; |
3592 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { | |
3593 | /* | |
3594 | * health_check_state returns 0 if health is | |
3595 | * bad. | |
3596 | */ | |
3597 | if (!health_check_state(health_sessiond, i)) { | |
3598 | reply.ret_code |= 1ULL << i; | |
3599 | } | |
44a5e5eb DG |
3600 | } |
3601 | ||
6c71277b | 3602 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
3603 | |
3604 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3605 | if (ret < 0) { | |
3606 | ERR("Failed to send health data back to client"); | |
3607 | } | |
3608 | ||
3609 | /* End of transmission */ | |
3610 | ret = close(new_sock); | |
3611 | if (ret) { | |
3612 | PERROR("close"); | |
3613 | } | |
3614 | new_sock = -1; | |
3615 | } | |
3616 | ||
139ac872 | 3617 | exit: |
44a5e5eb | 3618 | error: |
139ac872 MD |
3619 | if (err) { |
3620 | ERR("Health error occurred in %s", __func__); | |
3621 | } | |
44a5e5eb DG |
3622 | DBG("Health check thread dying"); |
3623 | unlink(health_unix_sock_path); | |
3624 | if (sock >= 0) { | |
3625 | ret = close(sock); | |
3626 | if (ret) { | |
3627 | PERROR("close"); | |
3628 | } | |
3629 | } | |
44a5e5eb DG |
3630 | |
3631 | lttng_poll_clean(&events); | |
3632 | ||
3633 | rcu_unregister_thread(); | |
3634 | return NULL; | |
3635 | } | |
3636 | ||
1d4b027a | 3637 | /* |
d063d709 DG |
3638 | * This thread manage all clients request using the unix client socket for |
3639 | * communication. | |
1d4b027a DG |
3640 | */ |
3641 | static void *thread_manage_clients(void *data) | |
3642 | { | |
139ac872 | 3643 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3644 | int sock_error; |
5eb91c98 | 3645 | uint32_t revents, nb_fd; |
273ea72c | 3646 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3647 | struct lttng_poll_event events; |
1d4b027a DG |
3648 | |
3649 | DBG("[thread] Manage client started"); | |
3650 | ||
f6a9efaa DG |
3651 | rcu_register_thread(); |
3652 | ||
6c71277b | 3653 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 3654 | |
6993eeb3 CB |
3655 | if (testpoint(thread_manage_clients)) { |
3656 | goto error_testpoint; | |
3657 | } | |
3658 | ||
840cb59c | 3659 | health_code_update(); |
44a5e5eb | 3660 | |
1d4b027a DG |
3661 | ret = lttcomm_listen_unix_sock(client_sock); |
3662 | if (ret < 0) { | |
35df2755 | 3663 | goto error_listen; |
1d4b027a DG |
3664 | } |
3665 | ||
5eb91c98 DG |
3666 | /* |
3667 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3668 | * more will be added to this poll set. | |
3669 | */ | |
d0b96690 | 3670 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3671 | if (ret < 0) { |
35df2755 | 3672 | goto error_create_poll; |
5eb91c98 | 3673 | } |
273ea72c | 3674 | |
5eb91c98 DG |
3675 | /* Add the application registration socket */ |
3676 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3677 | if (ret < 0) { | |
3678 | goto error; | |
3679 | } | |
273ea72c | 3680 | |
bbd973c2 DG |
3681 | /* |
3682 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3683 | */ |
3684 | if (opt_sig_parent) { | |
8db8d1dc | 3685 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3686 | } |
3687 | ||
6993eeb3 CB |
3688 | if (testpoint(thread_manage_clients_before_loop)) { |
3689 | goto error; | |
3690 | } | |
8ac94142 | 3691 | |
840cb59c | 3692 | health_code_update(); |
44a5e5eb | 3693 | |
1d4b027a | 3694 | while (1) { |
1d4b027a | 3695 | DBG("Accepting client command ..."); |
273ea72c DG |
3696 | |
3697 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3698 | restart: |
a78af745 | 3699 | health_poll_entry(); |
5eb91c98 | 3700 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3701 | health_poll_exit(); |
273ea72c | 3702 | if (ret < 0) { |
88f2b785 MD |
3703 | /* |
3704 | * Restart interrupted system call. | |
3705 | */ | |
3706 | if (errno == EINTR) { | |
3707 | goto restart; | |
3708 | } | |
273ea72c DG |
3709 | goto error; |
3710 | } | |
3711 | ||
0d9c5d77 DG |
3712 | nb_fd = ret; |
3713 | ||
5eb91c98 DG |
3714 | for (i = 0; i < nb_fd; i++) { |
3715 | /* Fetch once the poll data */ | |
3716 | revents = LTTNG_POLL_GETEV(&events, i); | |
3717 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3718 | ||
840cb59c | 3719 | health_code_update(); |
44a5e5eb | 3720 | |
5eb91c98 | 3721 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3722 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3723 | if (ret) { |
139ac872 MD |
3724 | err = 0; |
3725 | goto exit; | |
5eb91c98 DG |
3726 | } |
3727 | ||
3728 | /* Event on the registration socket */ | |
3729 | if (pollfd == client_sock) { | |
3730 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3731 | ERR("Client socket poll error"); | |
3732 | goto error; | |
3733 | } | |
3734 | } | |
3735 | } | |
3736 | ||
3737 | DBG("Wait for client response"); | |
3738 | ||
840cb59c | 3739 | health_code_update(); |
44a5e5eb | 3740 | |
5eb91c98 DG |
3741 | sock = lttcomm_accept_unix_sock(client_sock); |
3742 | if (sock < 0) { | |
273ea72c | 3743 | goto error; |
273ea72c DG |
3744 | } |
3745 | ||
b662582b DG |
3746 | /* |
3747 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3748 | * show must go on. | |
3749 | */ | |
3750 | (void) utils_set_fd_cloexec(sock); | |
3751 | ||
be040666 DG |
3752 | /* Set socket option for credentials retrieval */ |
3753 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3754 | if (ret < 0) { | |
3755 | goto error; | |
3756 | } | |
3757 | ||
5eb91c98 | 3758 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3759 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3760 | if (cmd_ctx == NULL) { |
76d7553f | 3761 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3762 | goto error; |
5eb91c98 | 3763 | } |
1d4b027a | 3764 | |
5eb91c98 | 3765 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3766 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3767 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3768 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3769 | goto error; |
3770 | } | |
1d4b027a | 3771 | |
5eb91c98 DG |
3772 | cmd_ctx->llm = NULL; |
3773 | cmd_ctx->session = NULL; | |
1d4b027a | 3774 | |
840cb59c | 3775 | health_code_update(); |
44a5e5eb | 3776 | |
5eb91c98 DG |
3777 | /* |
3778 | * Data is received from the lttng client. The struct | |
3779 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3780 | * the client. | |
3781 | */ | |
3782 | DBG("Receiving data from client ..."); | |
be040666 DG |
3783 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3784 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3785 | if (ret <= 0) { |
3786 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3787 | ret = close(sock); |
3788 | if (ret) { | |
3789 | PERROR("close"); | |
3790 | } | |
3791 | sock = -1; | |
a2c0da86 | 3792 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3793 | continue; |
3794 | } | |
1d4b027a | 3795 | |
840cb59c | 3796 | health_code_update(); |
44a5e5eb | 3797 | |
5eb91c98 DG |
3798 | // TODO: Validate cmd_ctx including sanity check for |
3799 | // security purpose. | |
f7776ea7 | 3800 | |
f6a9efaa | 3801 | rcu_thread_online(); |
5eb91c98 DG |
3802 | /* |
3803 | * This function dispatch the work to the kernel or userspace tracer | |
3804 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3805 | * informations for the client. The command context struct contains | |
3806 | * everything this function may needs. | |
3807 | */ | |
53a80697 | 3808 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3809 | rcu_thread_offline(); |
5eb91c98 | 3810 | if (ret < 0) { |
36134aa1 DG |
3811 | ret = close(sock); |
3812 | if (ret) { | |
3813 | PERROR("close"); | |
53a80697 | 3814 | } |
36134aa1 | 3815 | sock = -1; |
bbd973c2 | 3816 | /* |
5eb91c98 | 3817 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3818 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3819 | * (ENOMEM). Error detected but still accept |
3820 | * command, unless a socket error has been | |
3821 | * detected. | |
bbd973c2 | 3822 | */ |
bbd973c2 | 3823 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3824 | continue; |
3825 | } | |
d6e4fca4 | 3826 | |
840cb59c | 3827 | health_code_update(); |
44a5e5eb | 3828 | |
54d01ffb DG |
3829 | DBG("Sending response (size: %d, retcode: %s)", |
3830 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3831 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3832 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3833 | if (ret < 0) { |
3834 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3835 | } |
1d4b027a | 3836 | |
5eb91c98 | 3837 | /* End of transmission */ |
76d7553f MD |
3838 | ret = close(sock); |
3839 | if (ret) { | |
3840 | PERROR("close"); | |
3841 | } | |
3842 | sock = -1; | |
be040666 DG |
3843 | |
3844 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3845 | |
840cb59c | 3846 | health_code_update(); |
273ea72c DG |
3847 | } |
3848 | ||
139ac872 | 3849 | exit: |
5eb91c98 | 3850 | error: |
35df2755 CB |
3851 | if (sock >= 0) { |
3852 | ret = close(sock); | |
3853 | if (ret) { | |
3854 | PERROR("close"); | |
3855 | } | |
139ac872 | 3856 | } |
44a5e5eb | 3857 | |
35df2755 CB |
3858 | lttng_poll_clean(&events); |
3859 | clean_command_ctx(&cmd_ctx); | |
3860 | ||
3861 | error_listen: | |
3862 | error_create_poll: | |
6993eeb3 | 3863 | error_testpoint: |
273ea72c | 3864 | unlink(client_unix_sock_path); |
76d7553f MD |
3865 | if (client_sock >= 0) { |
3866 | ret = close(client_sock); | |
3867 | if (ret) { | |
3868 | PERROR("close"); | |
3869 | } | |
a4b35e07 | 3870 | } |
35df2755 CB |
3871 | |
3872 | if (err) { | |
840cb59c | 3873 | health_error(); |
35df2755 | 3874 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3875 | } |
273ea72c | 3876 | |
8782cc74 | 3877 | health_unregister(health_sessiond); |
35df2755 CB |
3878 | |
3879 | DBG("Client thread dying"); | |
f6a9efaa DG |
3880 | |
3881 | rcu_unregister_thread(); | |
1d4b027a DG |
3882 | return NULL; |
3883 | } | |
3884 | ||
3885 | ||
fac6795d DG |
3886 | /* |
3887 | * usage function on stderr | |
3888 | */ | |
3889 | static void usage(void) | |
3890 | { | |
b716ce68 | 3891 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3892 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3893 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3894 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3895 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3896 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3897 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3898 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3899 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3900 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3901 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3902 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3903 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3904 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3905 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3906 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3907 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3908 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3909 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3910 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3911 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3912 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3913 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3914 | } |
3915 | ||
3916 | /* | |
3917 | * daemon argument parsing | |
3918 | */ | |
3919 | static int parse_args(int argc, char **argv) | |
3920 | { | |
3921 | int c; | |
3922 | ||
3923 | static struct option long_options[] = { | |
3924 | { "client-sock", 1, 0, 'c' }, | |
3925 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3926 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3927 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3928 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3929 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3930 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3931 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3932 | { "consumerd32-path", 1, 0, 'u' }, | |
3933 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3934 | { "consumerd64-path", 1, 0, 't' }, | |
3935 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3936 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3937 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3938 | { "help", 0, 0, 'h' }, |
3939 | { "group", 1, 0, 'g' }, | |
3940 | { "version", 0, 0, 'V' }, | |
75462a81 | 3941 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3942 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3943 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3944 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3945 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3946 | { NULL, 0, 0, 0 } |
3947 | }; | |
3948 | ||
3949 | while (1) { | |
3950 | int option_index = 0; | |
35f90c40 | 3951 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3952 | long_options, &option_index); |
fac6795d DG |
3953 | if (c == -1) { |
3954 | break; | |
3955 | } | |
3956 | ||
3957 | switch (c) { | |
3958 | case 0: | |
3959 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3960 | if (optarg) { | |
3961 | fprintf(stderr, " with arg %s\n", optarg); | |
3962 | } | |
3963 | break; | |
b716ce68 | 3964 | case 'c': |
fac6795d DG |
3965 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3966 | break; | |
3967 | case 'a': | |
3968 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3969 | break; | |
3970 | case 'd': | |
3971 | opt_daemon = 1; | |
3972 | break; | |
3973 | case 'g': | |
6c71277b | 3974 | tracing_group_name = optarg; |
fac6795d DG |
3975 | break; |
3976 | case 'h': | |
3977 | usage(); | |
3978 | exit(EXIT_FAILURE); | |
3979 | case 'V': | |
3980 | fprintf(stdout, "%s\n", VERSION); | |
3981 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3982 | case 'S': |
3983 | opt_sig_parent = 1; | |
3984 | break; | |
d6f42150 | 3985 | case 'E': |
3bd1e081 | 3986 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3987 | break; |
3988 | case 'C': | |
3bd1e081 MD |
3989 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3990 | break; | |
3991 | case 'F': | |
7753dea8 | 3992 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3993 | break; |
3994 | case 'D': | |
7753dea8 MD |
3995 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3996 | break; | |
3997 | case 'H': | |
3998 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3999 | break; | |
4000 | case 'G': | |
4001 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 4002 | break; |
4fba7219 DG |
4003 | case 'N': |
4004 | opt_no_kernel = 1; | |
4005 | break; | |
75462a81 | 4006 | case 'q': |
97e19046 | 4007 | lttng_opt_quiet = 1; |
75462a81 | 4008 | break; |
3f9947db | 4009 | case 'v': |
53086306 | 4010 | /* Verbose level can increase using multiple -v */ |
97e19046 | 4011 | lttng_opt_verbose += 1; |
3f9947db | 4012 | break; |
31f73cc9 | 4013 | case 'Z': |
3bd1e081 | 4014 | opt_verbose_consumer += 1; |
31f73cc9 | 4015 | break; |
fb09408a | 4016 | case 'u': |
fc7a59ce | 4017 | consumerd32_bin= optarg; |
ebaeda94 MD |
4018 | break; |
4019 | case 'U': | |
4020 | consumerd32_libdir = optarg; | |
7753dea8 MD |
4021 | break; |
4022 | case 't': | |
fc7a59ce | 4023 | consumerd64_bin = optarg; |
ebaeda94 MD |
4024 | break; |
4025 | case 'T': | |
4026 | consumerd64_libdir = optarg; | |
fb09408a | 4027 | break; |
35f90c40 DG |
4028 | case 'p': |
4029 | opt_pidfile = optarg; | |
4030 | break; | |
fac6795d DG |
4031 | default: |
4032 | /* Unknown option or other error. | |
4033 | * Error is printed by getopt, just return */ | |
4034 | return -1; | |
4035 | } | |
4036 | } | |
4037 | ||
4038 | return 0; | |
4039 | } | |
4040 | ||
4041 | /* | |
d063d709 | 4042 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4043 | * apps_sock - The communication socket for all UST apps. |
4044 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4045 | */ |
cf3af59e | 4046 | static int init_daemon_socket(void) |
fac6795d DG |
4047 | { |
4048 | int ret = 0; | |
4049 | mode_t old_umask; | |
4050 | ||
4051 | old_umask = umask(0); | |
4052 | ||
4053 | /* Create client tool unix socket */ | |
d6f42150 DG |
4054 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4055 | if (client_sock < 0) { | |
4056 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4057 | ret = -1; |
4058 | goto end; | |
4059 | } | |
4060 | ||
b662582b DG |
4061 | /* Set the cloexec flag */ |
4062 | ret = utils_set_fd_cloexec(client_sock); | |
4063 | if (ret < 0) { | |
4064 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
4065 | "Continuing but note that the consumer daemon will have a " | |
4066 | "reference to this socket on exec()", client_sock); | |
4067 | } | |
4068 | ||
fac6795d DG |
4069 | /* File permission MUST be 660 */ |
4070 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4071 | if (ret < 0) { | |
d6f42150 | 4072 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4073 | PERROR("chmod"); |
fac6795d DG |
4074 | goto end; |
4075 | } | |
4076 | ||
4077 | /* Create the application unix socket */ | |
d6f42150 DG |
4078 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4079 | if (apps_sock < 0) { | |
4080 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4081 | ret = -1; |
4082 | goto end; | |
4083 | } | |
4084 | ||
b662582b DG |
4085 | /* Set the cloexec flag */ |
4086 | ret = utils_set_fd_cloexec(apps_sock); | |
4087 | if (ret < 0) { | |
4088 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
4089 | "Continuing but note that the consumer daemon will have a " | |
4090 | "reference to this socket on exec()", apps_sock); | |
4091 | } | |
4092 | ||
d6f42150 | 4093 | /* File permission MUST be 666 */ |
54d01ffb DG |
4094 | ret = chmod(apps_unix_sock_path, |
4095 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4096 | if (ret < 0) { |
d6f42150 | 4097 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4098 | PERROR("chmod"); |
fac6795d DG |
4099 | goto end; |
4100 | } | |
4101 | ||
b662582b DG |
4102 | DBG3("Session daemon client socket %d and application socket %d created", |
4103 | client_sock, apps_sock); | |
4104 | ||
fac6795d DG |
4105 | end: |
4106 | umask(old_umask); | |
4107 | return ret; | |
4108 | } | |
4109 | ||
4110 | /* | |
54d01ffb DG |
4111 | * Check if the global socket is available, and if a daemon is answering at the |
4112 | * other side. If yes, error is returned. | |
fac6795d | 4113 | */ |
cf3af59e | 4114 | static int check_existing_daemon(void) |
fac6795d | 4115 | { |
7d8234d9 | 4116 | /* Is there anybody out there ? */ |
099e26bd | 4117 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4118 | return -EEXIST; |
099e26bd | 4119 | } |
b09c7c76 DG |
4120 | |
4121 | return 0; | |
fac6795d DG |
4122 | } |
4123 | ||
fac6795d | 4124 | /* |
d063d709 | 4125 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4126 | * |
d063d709 | 4127 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4128 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4129 | */ |
be040666 | 4130 | static int set_permissions(char *rundir) |
fac6795d DG |
4131 | { |
4132 | int ret; | |
996b65c8 | 4133 | gid_t gid; |
fac6795d | 4134 | |
6c71277b | 4135 | gid = utils_get_group_id(tracing_group_name); |
fac6795d | 4136 | |
d6f42150 | 4137 | /* Set lttng run dir */ |
be040666 | 4138 | ret = chown(rundir, 0, gid); |
d6f42150 | 4139 | if (ret < 0) { |
be040666 | 4140 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4141 | PERROR("chown"); |
d6f42150 DG |
4142 | } |
4143 | ||
6c71277b MD |
4144 | /* |
4145 | * Ensure all applications and tracing group can search the run | |
4146 | * dir. Allow everyone to read the directory, since it does not | |
4147 | * buy us anything to hide its content. | |
4148 | */ | |
4149 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
4150 | if (ret < 0) { |
4151 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4152 | PERROR("chmod"); |
d1613cf5 JN |
4153 | } |
4154 | ||
d6f42150 | 4155 | /* lttng client socket path */ |
996b65c8 | 4156 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4157 | if (ret < 0) { |
d6f42150 | 4158 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4159 | PERROR("chown"); |
d6f42150 DG |
4160 | } |
4161 | ||
3bd1e081 | 4162 | /* kconsumer error socket path */ |
6c71277b | 4163 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 4164 | if (ret < 0) { |
3bd1e081 | 4165 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4166 | PERROR("chown"); |
3bd1e081 MD |
4167 | } |
4168 | ||
7753dea8 | 4169 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 4170 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
4171 | if (ret < 0) { |
4172 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4173 | PERROR("chown"); |
7753dea8 MD |
4174 | } |
4175 | ||
4176 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 4177 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 4178 | if (ret < 0) { |
7753dea8 | 4179 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4180 | PERROR("chown"); |
fac6795d DG |
4181 | } |
4182 | ||
d6f42150 | 4183 | DBG("All permissions are set"); |
e07ae692 | 4184 | |
fac6795d DG |
4185 | return ret; |
4186 | } | |
4187 | ||
d6f42150 | 4188 | /* |
d063d709 | 4189 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4190 | */ |
67e40797 | 4191 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4192 | { |
4193 | int ret; | |
4194 | ||
67e40797 DG |
4195 | DBG3("Creating LTTng run directory: %s", rundir); |
4196 | ||
d1613cf5 | 4197 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4198 | if (ret < 0) { |
b1f11e69 | 4199 | if (errno != EEXIST) { |
67e40797 | 4200 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4201 | goto error; |
4202 | } else { | |
4203 | ret = 0; | |
4204 | } | |
d6f42150 DG |
4205 | } |
4206 | ||
4207 | error: | |
4208 | return ret; | |
4209 | } | |
4210 | ||
4211 | /* | |
d063d709 DG |
4212 | * Setup sockets and directory needed by the kconsumerd communication with the |
4213 | * session daemon. | |
d6f42150 | 4214 | */ |
67e40797 DG |
4215 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4216 | const char *rundir) | |
d6f42150 DG |
4217 | { |
4218 | int ret; | |
67e40797 | 4219 | char path[PATH_MAX]; |
d6f42150 | 4220 | |
6c71277b | 4221 | switch (consumer_data->type) { |
7753dea8 | 4222 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4223 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4224 | break; |
4225 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4226 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4227 | break; |
4228 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4229 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4230 | break; |
4231 | default: | |
4232 | ERR("Consumer type unknown"); | |
4233 | ret = -EINVAL; | |
4234 | goto error; | |
d6f42150 DG |
4235 | } |
4236 | ||
67e40797 DG |
4237 | DBG2("Creating consumer directory: %s", path); |
4238 | ||
6c71277b | 4239 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
d6f42150 | 4240 | if (ret < 0) { |
6beb2242 | 4241 | if (errno != EEXIST) { |
f11e84c2 | 4242 | PERROR("mkdir"); |
3bd1e081 | 4243 | ERR("Failed to create %s", path); |
6beb2242 DG |
4244 | goto error; |
4245 | } | |
f11e84c2 | 4246 | ret = -1; |
d6f42150 | 4247 | } |
6c71277b MD |
4248 | if (is_root) { |
4249 | ret = chown(path, 0, utils_get_group_id(tracing_group_name)); | |
4250 | if (ret < 0) { | |
4251 | ERR("Unable to set group on %s", path); | |
4252 | PERROR("chown"); | |
4253 | goto error; | |
4254 | } | |
4255 | } | |
d6f42150 DG |
4256 | |
4257 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4258 | consumer_data->err_sock = |
4259 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4260 | if (consumer_data->err_sock < 0) { | |
4261 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4262 | ret = -1; |
4263 | goto error; | |
4264 | } | |
4265 | ||
a24f05ab MD |
4266 | /* |
4267 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4268 | * show must go on. | |
4269 | */ | |
4270 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
4271 | if (ret < 0) { | |
4272 | PERROR("utils_set_fd_cloexec"); | |
4273 | /* continue anyway */ | |
4274 | } | |
4275 | ||
d6f42150 | 4276 | /* File permission MUST be 660 */ |
3bd1e081 | 4277 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4278 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4279 | if (ret < 0) { |
3bd1e081 | 4280 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4281 | PERROR("chmod"); |
d6f42150 DG |
4282 | goto error; |
4283 | } | |
4284 | ||
4285 | error: | |
4286 | return ret; | |
4287 | } | |
4288 | ||
fac6795d | 4289 | /* |
d063d709 | 4290 | * Signal handler for the daemon |
cf3af59e | 4291 | * |
54d01ffb DG |
4292 | * Simply stop all worker threads, leaving main() return gracefully after |
4293 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4294 | */ |
4295 | static void sighandler(int sig) | |
4296 | { | |
4297 | switch (sig) { | |
cf3af59e | 4298 | case SIGPIPE: |
af87c45a | 4299 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4300 | return; |
4301 | case SIGINT: | |
af87c45a | 4302 | DBG("SIGINT caught"); |
cf3af59e MD |
4303 | stop_threads(); |
4304 | break; | |
4305 | case SIGTERM: | |
af87c45a | 4306 | DBG("SIGTERM caught"); |
cf3af59e MD |
4307 | stop_threads(); |
4308 | break; | |
4309 | default: | |
4310 | break; | |
fac6795d | 4311 | } |
fac6795d DG |
4312 | } |
4313 | ||
4314 | /* | |
d063d709 | 4315 | * Setup signal handler for : |
1d4b027a | 4316 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4317 | */ |
1d4b027a | 4318 | static int set_signal_handler(void) |
fac6795d | 4319 | { |
1d4b027a DG |
4320 | int ret = 0; |
4321 | struct sigaction sa; | |
4322 | sigset_t sigset; | |
fac6795d | 4323 | |
1d4b027a | 4324 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4325 | PERROR("sigemptyset"); |
1d4b027a DG |
4326 | return ret; |
4327 | } | |
d6f42150 | 4328 | |
1d4b027a DG |
4329 | sa.sa_handler = sighandler; |
4330 | sa.sa_mask = sigset; | |
4331 | sa.sa_flags = 0; | |
4332 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4333 | PERROR("sigaction"); |
1d4b027a | 4334 | return ret; |
d6f42150 DG |
4335 | } |
4336 | ||
1d4b027a | 4337 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4338 | PERROR("sigaction"); |
1d4b027a | 4339 | return ret; |
d6f42150 | 4340 | } |
aaf26714 | 4341 | |
1d4b027a | 4342 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4343 | PERROR("sigaction"); |
1d4b027a | 4344 | return ret; |
8c0faa1d DG |
4345 | } |
4346 | ||
1d4b027a DG |
4347 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4348 | ||
4349 | return ret; | |
fac6795d DG |
4350 | } |
4351 | ||
f3ed775e | 4352 | /* |
d063d709 DG |
4353 | * Set open files limit to unlimited. This daemon can open a large number of |
4354 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4355 | */ |
4356 | static void set_ulimit(void) | |
4357 | { | |
4358 | int ret; | |
4359 | struct rlimit lim; | |
4360 | ||
a88df331 | 4361 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4362 | lim.rlim_cur = 65535; |
4363 | lim.rlim_max = 65535; | |
4364 | ||
4365 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4366 | if (ret < 0) { | |
76d7553f | 4367 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4368 | } |
4369 | } | |
4370 | ||
35f90c40 DG |
4371 | /* |
4372 | * Write pidfile using the rundir and opt_pidfile. | |
4373 | */ | |
4374 | static void write_pidfile(void) | |
4375 | { | |
4376 | int ret; | |
4377 | char pidfile_path[PATH_MAX]; | |
4378 | ||
4379 | assert(rundir); | |
4380 | ||
4381 | if (opt_pidfile) { | |
4382 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
4383 | } else { | |
4384 | /* Build pidfile path from rundir and opt_pidfile. */ | |
4385 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
4386 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
4387 | if (ret < 0) { | |
4388 | PERROR("snprintf pidfile path"); | |
4389 | goto error; | |
4390 | } | |
4391 | } | |
4392 | ||
4393 | /* | |
4394 | * Create pid file in rundir. Return value is of no importance. The | |
4395 | * execution will continue even though we are not able to write the file. | |
4396 | */ | |
4397 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
4398 | ||
4399 | error: | |
4400 | return; | |
4401 | } | |
4402 | ||
fac6795d DG |
4403 | /* |
4404 | * main | |
4405 | */ | |
4406 | int main(int argc, char **argv) | |
4407 | { | |
fac6795d DG |
4408 | int ret = 0; |
4409 | void *status; | |
ae9e45b3 | 4410 | const char *home_path, *env_app_timeout; |
fac6795d | 4411 | |
335a95b7 MD |
4412 | init_kernel_workarounds(); |
4413 | ||
f6a9efaa DG |
4414 | rcu_register_thread(); |
4415 | ||
7753dea8 | 4416 | setup_consumerd_path(); |
fb09408a | 4417 | |
12744796 DG |
4418 | page_size = sysconf(_SC_PAGESIZE); |
4419 | if (page_size < 0) { | |
4420 | PERROR("sysconf _SC_PAGESIZE"); | |
4421 | page_size = LONG_MAX; | |
4422 | WARN("Fallback page size to %ld", page_size); | |
4423 | } | |
4424 | ||
fac6795d DG |
4425 | /* Parse arguments */ |
4426 | progname = argv[0]; | |
c617c0c6 | 4427 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 4428 | goto error; |
fac6795d DG |
4429 | } |
4430 | ||
4431 | /* Daemonize */ | |
4432 | if (opt_daemon) { | |
ceed52b5 MD |
4433 | int i; |
4434 | ||
4435 | /* | |
4436 | * fork | |
4437 | * child: setsid, close FD 0, 1, 2, chdir / | |
4438 | * parent: exit (if fork is successful) | |
4439 | */ | |
53094c05 DG |
4440 | ret = daemon(0, 0); |
4441 | if (ret < 0) { | |
76d7553f | 4442 | PERROR("daemon"); |
cf3af59e | 4443 | goto error; |
53094c05 | 4444 | } |
ceed52b5 MD |
4445 | /* |
4446 | * We are in the child. Make sure all other file | |
4447 | * descriptors are closed, in case we are called with | |
4448 | * more opened file descriptors than the standard ones. | |
4449 | */ | |
4450 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4451 | (void) close(i); | |
4452 | } | |
4453 | } | |
4454 | ||
4455 | /* Create thread quit pipe */ | |
4456 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4457 | goto error; | |
fac6795d DG |
4458 | } |
4459 | ||
4460 | /* Check if daemon is UID = 0 */ | |
4461 | is_root = !getuid(); | |
4462 | ||
fac6795d | 4463 | if (is_root) { |
990570ed | 4464 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4465 | |
4466 | /* Create global run dir with root access */ | |
4467 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4468 | if (ret < 0) { |
cf3af59e | 4469 | goto error; |
d6f42150 DG |
4470 | } |
4471 | ||
fac6795d | 4472 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4473 | snprintf(apps_unix_sock_path, PATH_MAX, |
4474 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4475 | } |
4476 | ||
4477 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4478 | snprintf(client_unix_sock_path, PATH_MAX, |
4479 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4480 | } | |
0fdd1e2c DG |
4481 | |
4482 | /* Set global SHM for ust */ | |
4483 | if (strlen(wait_shm_path) == 0) { | |
4484 | snprintf(wait_shm_path, PATH_MAX, | |
4485 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4486 | } | |
67e40797 | 4487 | |
44a5e5eb DG |
4488 | if (strlen(health_unix_sock_path) == 0) { |
4489 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4490 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4491 | } | |
4492 | ||
67e40797 DG |
4493 | /* Setup kernel consumerd path */ |
4494 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4495 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4496 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4497 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4498 | |
4499 | DBG2("Kernel consumer err path: %s", | |
4500 | kconsumer_data.err_unix_sock_path); | |
4501 | DBG2("Kernel consumer cmd path: %s", | |
4502 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4503 | } else { |
feb0f3e5 | 4504 | home_path = utils_get_home_dir(); |
b082db07 | 4505 | if (home_path == NULL) { |
273ea72c DG |
4506 | /* TODO: Add --socket PATH option */ |
4507 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4508 | ret = -EPERM; |
4509 | goto error; | |
b082db07 DG |
4510 | } |
4511 | ||
67e40797 DG |
4512 | /* |
4513 | * Create rundir from home path. This will create something like | |
4514 | * $HOME/.lttng | |
4515 | */ | |
990570ed | 4516 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4517 | if (ret < 0) { |
4518 | ret = -ENOMEM; | |
4519 | goto error; | |
4520 | } | |
4521 | ||
4522 | ret = create_lttng_rundir(rundir); | |
4523 | if (ret < 0) { | |
4524 | goto error; | |
4525 | } | |
4526 | ||
fac6795d | 4527 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4528 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4529 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4530 | } |
4531 | ||
4532 | /* Set the cli tool unix socket path */ | |
4533 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4534 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4535 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4536 | } |
0fdd1e2c DG |
4537 | |
4538 | /* Set global SHM for ust */ | |
4539 | if (strlen(wait_shm_path) == 0) { | |
4540 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4541 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4542 | } |
44a5e5eb DG |
4543 | |
4544 | /* Set health check Unix path */ | |
4545 | if (strlen(health_unix_sock_path) == 0) { | |
4546 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4547 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4548 | } | |
fac6795d DG |
4549 | } |
4550 | ||
5c827ce0 DG |
4551 | /* Set consumer initial state */ |
4552 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4553 | ust_consumerd_state = CONSUMER_STOPPED; | |
4554 | ||
847177cd DG |
4555 | DBG("Client socket path %s", client_unix_sock_path); |
4556 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4557 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4558 | DBG("LTTng run directory path: %s", rundir); |
4559 | ||
4560 | /* 32 bits consumerd path setup */ | |
4561 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4562 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4563 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4564 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4565 | |
4566 | DBG2("UST consumer 32 bits err path: %s", | |
4567 | ustconsumer32_data.err_unix_sock_path); | |
4568 | DBG2("UST consumer 32 bits cmd path: %s", | |
4569 | ustconsumer32_data.cmd_unix_sock_path); | |
4570 | ||
4571 | /* 64 bits consumerd path setup */ | |
4572 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4573 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4574 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4575 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4576 | |
4577 | DBG2("UST consumer 64 bits err path: %s", | |
4578 | ustconsumer64_data.err_unix_sock_path); | |
4579 | DBG2("UST consumer 64 bits cmd path: %s", | |
4580 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4581 | |
273ea72c | 4582 | /* |
7d8234d9 | 4583 | * See if daemon already exist. |
fac6795d | 4584 | */ |
7d8234d9 | 4585 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4586 | ERR("Already running daemon.\n"); |
273ea72c | 4587 | /* |
cf3af59e MD |
4588 | * We do not goto exit because we must not cleanup() |
4589 | * because a daemon is already running. | |
ab118b20 | 4590 | */ |
cf3af59e | 4591 | goto error; |
a88df331 DG |
4592 | } |
4593 | ||
1427f9b2 DG |
4594 | /* |
4595 | * Init UST app hash table. Alloc hash table before this point since | |
4596 | * cleanup() can get called after that point. | |
4597 | */ | |
4598 | ust_app_ht_alloc(); | |
4599 | ||
54d01ffb | 4600 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4601 | |
4602 | /* | |
4603 | * These actions must be executed as root. We do that *after* setting up | |
4604 | * the sockets path because we MUST make the check for another daemon using | |
4605 | * those paths *before* trying to set the kernel consumer sockets and init | |
4606 | * kernel tracer. | |
4607 | */ | |
4608 | if (is_root) { | |
67e40797 | 4609 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4610 | if (ret < 0) { |
4611 | goto exit; | |
4612 | } | |
4613 | ||
a88df331 | 4614 | /* Setup kernel tracer */ |
4fba7219 DG |
4615 | if (!opt_no_kernel) { |
4616 | init_kernel_tracer(); | |
4617 | } | |
a88df331 DG |
4618 | |
4619 | /* Set ulimit for open files */ | |
4620 | set_ulimit(); | |
fac6795d | 4621 | } |
4063050c MD |
4622 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4623 | lttng_fd_init(); | |
fac6795d | 4624 | |
67e40797 DG |
4625 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4626 | if (ret < 0) { | |
4627 | goto exit; | |
4628 | } | |
4629 | ||
4630 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4631 | if (ret < 0) { | |
4632 | goto exit; | |
4633 | } | |
4634 | ||
cf3af59e MD |
4635 | if ((ret = set_signal_handler()) < 0) { |
4636 | goto exit; | |
fac6795d DG |
4637 | } |
4638 | ||
d6f42150 | 4639 | /* Setup the needed unix socket */ |
cf3af59e MD |
4640 | if ((ret = init_daemon_socket()) < 0) { |
4641 | goto exit; | |
fac6795d DG |
4642 | } |
4643 | ||
4644 | /* Set credentials to socket */ | |
be040666 | 4645 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4646 | goto exit; |
fac6795d DG |
4647 | } |
4648 | ||
5b8719f5 DG |
4649 | /* Get parent pid if -S, --sig-parent is specified. */ |
4650 | if (opt_sig_parent) { | |
4651 | ppid = getppid(); | |
4652 | } | |
4653 | ||
7a485870 | 4654 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4655 | if (is_root && !opt_no_kernel) { |
4656 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4657 | goto exit; | |
4658 | } | |
7a485870 DG |
4659 | } |
4660 | ||
0b2dc8df MD |
4661 | /* Setup the thread ht_cleanup communication pipe. */ |
4662 | if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) { | |
4663 | goto exit; | |
4664 | } | |
4665 | ||
099e26bd | 4666 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4667 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4668 | goto exit; |
4669 | } | |
4670 | ||
d0b96690 DG |
4671 | /* Setup the thread apps notify communication pipe. */ |
4672 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
4673 | goto exit; | |
4674 | } | |
4675 | ||
7972aab2 DG |
4676 | /* Initialize global buffer per UID and PID registry. */ |
4677 | buffer_reg_init_uid_registry(); | |
4678 | buffer_reg_init_pid_registry(); | |
4679 | ||
099e26bd DG |
4680 | /* Init UST command queue. */ |
4681 | cds_wfq_init(&ust_cmd_queue.queue); | |
4682 | ||
273ea72c | 4683 | /* |
54d01ffb DG |
4684 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4685 | * statically declared in session.c | |
273ea72c | 4686 | */ |
54d01ffb | 4687 | session_list_ptr = session_get_list(); |
b5541356 | 4688 | |
5eb91c98 DG |
4689 | /* Set up max poll set size */ |
4690 | lttng_poll_set_max_size(); | |
4691 | ||
2f77fc4b | 4692 | cmd_init(); |
00e2e675 | 4693 | |
ae9e45b3 DG |
4694 | /* Check for the application socket timeout env variable. */ |
4695 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4696 | if (env_app_timeout) { | |
4697 | app_socket_timeout = atoi(env_app_timeout); | |
4698 | } else { | |
4699 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4700 | } | |
4701 | ||
35f90c40 DG |
4702 | write_pidfile(); |
4703 | ||
554831e7 MD |
4704 | /* Initialize communication library */ |
4705 | lttcomm_init(); | |
d831c249 DG |
4706 | /* This is to get the TCP timeout value. */ |
4707 | lttcomm_inet_init(); | |
554831e7 | 4708 | |
67e05644 DG |
4709 | /* |
4710 | * Initialize the health check subsystem. This call should set the | |
4711 | * appropriate time values. | |
4712 | */ | |
6c71277b | 4713 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); |
8782cc74 MD |
4714 | if (!health_sessiond) { |
4715 | PERROR("health_app_create error"); | |
4716 | goto exit_health_sessiond_cleanup; | |
4717 | } | |
67e05644 | 4718 | |
0b2dc8df MD |
4719 | /* Create thread to manage the client socket */ |
4720 | ret = pthread_create(&ht_cleanup_thread, NULL, | |
4721 | thread_ht_cleanup, (void *) NULL); | |
4722 | if (ret != 0) { | |
4723 | PERROR("pthread_create ht_cleanup"); | |
4724 | goto exit_ht_cleanup; | |
4725 | } | |
4726 | ||
44a5e5eb DG |
4727 | /* Create thread to manage the client socket */ |
4728 | ret = pthread_create(&health_thread, NULL, | |
4729 | thread_manage_health, (void *) NULL); | |
4730 | if (ret != 0) { | |
4731 | PERROR("pthread_create health"); | |
4732 | goto exit_health; | |
4733 | } | |
4734 | ||
cf3af59e | 4735 | /* Create thread to manage the client socket */ |
099e26bd DG |
4736 | ret = pthread_create(&client_thread, NULL, |
4737 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4738 | if (ret != 0) { |
76d7553f | 4739 | PERROR("pthread_create clients"); |
cf3af59e MD |
4740 | goto exit_client; |
4741 | } | |
fac6795d | 4742 | |
099e26bd DG |
4743 | /* Create thread to dispatch registration */ |
4744 | ret = pthread_create(&dispatch_thread, NULL, | |
4745 | thread_dispatch_ust_registration, (void *) NULL); | |
4746 | if (ret != 0) { | |
76d7553f | 4747 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4748 | goto exit_dispatch; |
4749 | } | |
4750 | ||
4751 | /* Create thread to manage application registration. */ | |
4752 | ret = pthread_create(®_apps_thread, NULL, | |
4753 | thread_registration_apps, (void *) NULL); | |
4754 | if (ret != 0) { | |
76d7553f | 4755 | PERROR("pthread_create registration"); |
099e26bd DG |
4756 | goto exit_reg_apps; |
4757 | } | |
4758 | ||
cf3af59e | 4759 | /* Create thread to manage application socket */ |
54d01ffb DG |
4760 | ret = pthread_create(&apps_thread, NULL, |
4761 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4762 | if (ret != 0) { |
d0b96690 DG |
4763 | PERROR("pthread_create apps"); |
4764 | goto exit_apps; | |
4765 | } | |
4766 | ||
4767 | /* Create thread to manage application notify socket */ | |
4768 | ret = pthread_create(&apps_notify_thread, NULL, | |
4769 | ust_thread_manage_notify, (void *) NULL); | |
4770 | if (ret != 0) { | |
76d7553f | 4771 | PERROR("pthread_create apps"); |
9563b0ad | 4772 | goto exit_apps_notify; |
cf3af59e | 4773 | } |
fac6795d | 4774 | |
6620da75 DG |
4775 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4776 | if (is_root && !opt_no_kernel) { | |
4777 | /* Create kernel thread to manage kernel event */ | |
4778 | ret = pthread_create(&kernel_thread, NULL, | |
4779 | thread_manage_kernel, (void *) NULL); | |
4780 | if (ret != 0) { | |
4781 | PERROR("pthread_create kernel"); | |
4782 | goto exit_kernel; | |
4783 | } | |
7a485870 | 4784 | |
6620da75 DG |
4785 | ret = pthread_join(kernel_thread, &status); |
4786 | if (ret != 0) { | |
4787 | PERROR("pthread_join"); | |
4788 | goto error; /* join error, exit without cleanup */ | |
4789 | } | |
fac6795d DG |
4790 | } |
4791 | ||
cf3af59e | 4792 | exit_kernel: |
9563b0ad DG |
4793 | ret = pthread_join(apps_notify_thread, &status); |
4794 | if (ret != 0) { | |
4795 | PERROR("pthread_join apps notify"); | |
4796 | goto error; /* join error, exit without cleanup */ | |
4797 | } | |
4798 | ||
4799 | exit_apps_notify: | |
cf3af59e MD |
4800 | ret = pthread_join(apps_thread, &status); |
4801 | if (ret != 0) { | |
9563b0ad | 4802 | PERROR("pthread_join apps"); |
cf3af59e MD |
4803 | goto error; /* join error, exit without cleanup */ |
4804 | } | |
fac6795d | 4805 | |
4ccd8c8f | 4806 | |
cf3af59e | 4807 | exit_apps: |
099e26bd DG |
4808 | ret = pthread_join(reg_apps_thread, &status); |
4809 | if (ret != 0) { | |
76d7553f | 4810 | PERROR("pthread_join"); |
099e26bd DG |
4811 | goto error; /* join error, exit without cleanup */ |
4812 | } | |
4813 | ||
4814 | exit_reg_apps: | |
4815 | ret = pthread_join(dispatch_thread, &status); | |
4816 | if (ret != 0) { | |
76d7553f | 4817 | PERROR("pthread_join"); |
099e26bd DG |
4818 | goto error; /* join error, exit without cleanup */ |
4819 | } | |
4820 | ||
4821 | exit_dispatch: | |
cf3af59e MD |
4822 | ret = pthread_join(client_thread, &status); |
4823 | if (ret != 0) { | |
76d7553f | 4824 | PERROR("pthread_join"); |
cf3af59e MD |
4825 | goto error; /* join error, exit without cleanup */ |
4826 | } | |
4827 | ||
3bd1e081 | 4828 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4829 | if (ret != 0) { |
76d7553f | 4830 | PERROR("join_consumer"); |
cf3af59e MD |
4831 | goto error; /* join error, exit without cleanup */ |
4832 | } | |
a88df331 | 4833 | |
06f525de DG |
4834 | ret = join_consumer_thread(&ustconsumer32_data); |
4835 | if (ret != 0) { | |
4836 | PERROR("join_consumer ust32"); | |
4837 | goto error; /* join error, exit without cleanup */ | |
4838 | } | |
4839 | ||
4840 | ret = join_consumer_thread(&ustconsumer64_data); | |
4841 | if (ret != 0) { | |
4842 | PERROR("join_consumer ust64"); | |
4843 | goto error; /* join error, exit without cleanup */ | |
4844 | } | |
4845 | ||
cf3af59e | 4846 | exit_client: |
06f525de DG |
4847 | ret = pthread_join(health_thread, &status); |
4848 | if (ret != 0) { | |
4849 | PERROR("pthread_join health thread"); | |
4850 | goto error; /* join error, exit without cleanup */ | |
4851 | } | |
4852 | ||
44a5e5eb | 4853 | exit_health: |
0b2dc8df MD |
4854 | ret = pthread_join(ht_cleanup_thread, &status); |
4855 | if (ret != 0) { | |
4856 | PERROR("pthread_join ht cleanup thread"); | |
4857 | goto error; /* join error, exit without cleanup */ | |
4858 | } | |
4859 | exit_ht_cleanup: | |
8782cc74 MD |
4860 | health_app_destroy(health_sessiond); |
4861 | exit_health_sessiond_cleanup: | |
a88df331 | 4862 | exit: |
cf3af59e MD |
4863 | /* |
4864 | * cleanup() is called when no other thread is running. | |
4865 | */ | |
f6a9efaa | 4866 | rcu_thread_online(); |
cf3af59e | 4867 | cleanup(); |
f6a9efaa DG |
4868 | rcu_thread_offline(); |
4869 | rcu_unregister_thread(); | |
67e40797 | 4870 | if (!ret) { |
cf3af59e | 4871 | exit(EXIT_SUCCESS); |
67e40797 | 4872 | } |
cf3af59e | 4873 | error: |
5e16da05 | 4874 | exit(EXIT_FAILURE); |
fac6795d | 4875 | } |