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" |
44a5e5eb | 63 | #include "health.h" |
8ac94142 | 64 | #include "testpoint.h" |
d0b96690 | 65 | #include "ust-thread.h" |
fac6795d | 66 | |
ebaeda94 MD |
67 | #define CONSUMERD_FILE "lttng-consumerd" |
68 | ||
75462a81 | 69 | /* Const values */ |
bbccc3d2 | 70 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab | 71 | |
fac6795d DG |
72 | const char *progname; |
73 | const char *opt_tracing_group; | |
35f90c40 | 74 | static const char *opt_pidfile; |
5b8719f5 | 75 | static int opt_sig_parent; |
97e19046 | 76 | static int opt_verbose_consumer; |
fac6795d | 77 | static int opt_daemon; |
4fba7219 | 78 | static int opt_no_kernel; |
fac6795d | 79 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 80 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 81 | static char *rundir; |
3bd1e081 | 82 | |
a23ec3a7 DG |
83 | /* |
84 | * Consumer daemon specific control data. Every value not initialized here is | |
85 | * set to 0 by the static definition. | |
86 | */ | |
3bd1e081 MD |
87 | static struct consumer_data kconsumer_data = { |
88 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
89 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
90 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
91 | .err_sock = -1, |
92 | .cmd_sock = -1, | |
331744e3 | 93 | .metadata_sock.fd = -1, |
173af62f DG |
94 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
95 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
96 | .cond = PTHREAD_COND_INITIALIZER, |
97 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 98 | }; |
7753dea8 MD |
99 | static struct consumer_data ustconsumer64_data = { |
100 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
101 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
102 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
103 | .err_sock = -1, |
104 | .cmd_sock = -1, | |
331744e3 | 105 | .metadata_sock.fd = -1, |
173af62f DG |
106 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
107 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
108 | .cond = PTHREAD_COND_INITIALIZER, |
109 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
110 | }; |
111 | static struct consumer_data ustconsumer32_data = { | |
112 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
113 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
114 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
115 | .err_sock = -1, |
116 | .cmd_sock = -1, | |
331744e3 | 117 | .metadata_sock.fd = -1, |
173af62f DG |
118 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
119 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
120 | .cond = PTHREAD_COND_INITIALIZER, |
121 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
122 | }; |
123 | ||
26c9d55e | 124 | /* Shared between threads */ |
099e26bd | 125 | static int dispatch_thread_exit; |
fac6795d | 126 | |
54d01ffb DG |
127 | /* Global application Unix socket path */ |
128 | static char apps_unix_sock_path[PATH_MAX]; | |
129 | /* Global client Unix socket path */ | |
130 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
131 | /* global wait shm path for UST */ |
132 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
133 | /* Global health check unix path */ |
134 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 135 | |
1d4b027a | 136 | /* Sockets and FDs */ |
a4b35e07 MD |
137 | static int client_sock = -1; |
138 | static int apps_sock = -1; | |
2f77fc4b | 139 | int kernel_tracer_fd = -1; |
76d7553f | 140 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 141 | |
273ea72c DG |
142 | /* |
143 | * Quit pipe for all threads. This permits a single cancellation point | |
144 | * for all threads when receiving an event on the pipe. | |
145 | */ | |
76d7553f | 146 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 147 | |
099e26bd DG |
148 | /* |
149 | * This pipe is used to inform the thread managing application communication | |
150 | * that a command is queued and ready to be processed. | |
151 | */ | |
76d7553f | 152 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 153 | |
d0b96690 DG |
154 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
155 | ||
1d4b027a | 156 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 157 | static pthread_t apps_thread; |
d0b96690 | 158 | static pthread_t apps_notify_thread; |
099e26bd | 159 | static pthread_t reg_apps_thread; |
1d4b027a | 160 | static pthread_t client_thread; |
7a485870 | 161 | static pthread_t kernel_thread; |
099e26bd | 162 | static pthread_t dispatch_thread; |
44a5e5eb | 163 | static pthread_t health_thread; |
0b2dc8df | 164 | static pthread_t ht_cleanup_thread; |
5eb91c98 | 165 | |
099e26bd DG |
166 | /* |
167 | * UST registration command queue. This queue is tied with a futex and uses a N | |
168 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
169 | * | |
170 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
171 | * this queue and the wait/wake scheme. | |
172 | */ | |
173 | static struct ust_cmd_queue ust_cmd_queue; | |
174 | ||
b5541356 DG |
175 | /* |
176 | * Pointer initialized before thread creation. | |
177 | * | |
178 | * This points to the tracing session list containing the session count and a | |
179 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
180 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 181 | * |
d063d709 | 182 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 183 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
184 | */ |
185 | static struct ltt_session_list *session_list_ptr; | |
186 | ||
7753dea8 MD |
187 | int ust_consumerd64_fd = -1; |
188 | int ust_consumerd32_fd = -1; | |
189 | ||
fb6f1fa2 YB |
190 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
191 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
192 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
193 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 194 | |
2f77fc4b DG |
195 | static const char *module_proc_lttng = "/proc/lttng"; |
196 | ||
5c827ce0 DG |
197 | /* |
198 | * Consumer daemon state which is changed when spawning it, killing it or in | |
199 | * case of a fatal error. | |
200 | */ | |
201 | enum consumerd_state { | |
202 | CONSUMER_STARTED = 1, | |
203 | CONSUMER_STOPPED = 2, | |
204 | CONSUMER_ERROR = 3, | |
205 | }; | |
206 | ||
207 | /* | |
208 | * This consumer daemon state is used to validate if a client command will be | |
209 | * able to reach the consumer. If not, the client is informed. For instance, | |
210 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
211 | * error to the client. | |
212 | * | |
213 | * The following example shows a possible race condition of this scheme: | |
214 | * | |
215 | * consumer thread error happens | |
216 | * client cmd arrives | |
217 | * client cmd checks state -> still OK | |
218 | * consumer thread exit, sets error | |
219 | * client cmd try to talk to consumer | |
220 | * ... | |
221 | * | |
222 | * However, since the consumer is a different daemon, we have no way of making | |
223 | * sure the command will reach it safely even with this state flag. This is why | |
224 | * we consider that up to the state validation during command processing, the | |
225 | * command is safe. After that, we can not guarantee the correctness of the | |
226 | * client request vis-a-vis the consumer. | |
227 | */ | |
228 | static enum consumerd_state ust_consumerd_state; | |
229 | static enum consumerd_state kernel_consumerd_state; | |
230 | ||
ae9e45b3 DG |
231 | /* |
232 | * Socket timeout for receiving and sending in seconds. | |
233 | */ | |
234 | static int app_socket_timeout; | |
235 | ||
12744796 DG |
236 | /* Set in main() with the current page size. */ |
237 | long page_size; | |
238 | ||
fb09408a | 239 | static |
7753dea8 | 240 | void setup_consumerd_path(void) |
fb09408a | 241 | { |
fc7a59ce | 242 | const char *bin, *libdir; |
fb09408a | 243 | |
7753dea8 MD |
244 | /* |
245 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
246 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
247 | * has not been defined. | |
7753dea8 | 248 | */ |
ebaeda94 | 249 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
250 | if (!consumerd32_bin[0]) { |
251 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
252 | } |
253 | if (!consumerd32_libdir[0]) { | |
254 | consumerd32_libdir = INSTALL_LIB_PATH; | |
255 | } | |
256 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
257 | if (!consumerd64_bin[0]) { |
258 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 259 | } |
ebaeda94 MD |
260 | if (!consumerd64_libdir[0]) { |
261 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
262 | } |
263 | #else | |
264 | #error "Unknown bitness" | |
265 | #endif | |
266 | ||
fb09408a MD |
267 | /* |
268 | * runtime env. var. overrides the build default. | |
269 | */ | |
fc7a59ce AM |
270 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
271 | if (bin) { | |
272 | consumerd32_bin = bin; | |
7753dea8 | 273 | } |
fc7a59ce AM |
274 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
275 | if (bin) { | |
276 | consumerd64_bin = bin; | |
ebaeda94 | 277 | } |
72f579ee | 278 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
279 | if (libdir) { |
280 | consumerd32_libdir = libdir; | |
281 | } | |
72f579ee | 282 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
283 | if (libdir) { |
284 | consumerd64_libdir = libdir; | |
fb09408a MD |
285 | } |
286 | } | |
287 | ||
5eb91c98 DG |
288 | /* |
289 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
290 | */ | |
d0b96690 | 291 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) |
5eb91c98 DG |
292 | { |
293 | int ret; | |
294 | ||
d0b96690 | 295 | assert(events); |
5eb91c98 DG |
296 | |
297 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
298 | if (ret < 0) { | |
299 | goto error; | |
300 | } | |
301 | ||
302 | /* Add quit pipe */ | |
d0b96690 | 303 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
304 | if (ret < 0) { |
305 | goto error; | |
306 | } | |
307 | ||
308 | return 0; | |
309 | ||
310 | error: | |
311 | return ret; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Check if the thread quit pipe was triggered. | |
316 | * | |
317 | * Return 1 if it was triggered else 0; | |
318 | */ | |
d0b96690 | 319 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
5eb91c98 DG |
320 | { |
321 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
322 | return 1; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
0fdd1e2c DG |
328 | /* |
329 | * Return group ID of the tracing group or -1 if not found. | |
330 | */ | |
996b65c8 MD |
331 | static gid_t allowed_group(void) |
332 | { | |
333 | struct group *grp; | |
334 | ||
274e143b MD |
335 | if (opt_tracing_group) { |
336 | grp = getgrnam(opt_tracing_group); | |
337 | } else { | |
338 | grp = getgrnam(default_tracing_group); | |
339 | } | |
996b65c8 MD |
340 | if (!grp) { |
341 | return -1; | |
342 | } else { | |
343 | return grp->gr_gid; | |
344 | } | |
345 | } | |
346 | ||
273ea72c | 347 | /* |
5eb91c98 | 348 | * Init thread quit pipe. |
273ea72c DG |
349 | * |
350 | * Return -1 on error or 0 if all pipes are created. | |
351 | */ | |
352 | static int init_thread_quit_pipe(void) | |
353 | { | |
730389d9 | 354 | int ret, i; |
273ea72c | 355 | |
730389d9 | 356 | ret = pipe(thread_quit_pipe); |
273ea72c | 357 | if (ret < 0) { |
730389d9 | 358 | PERROR("thread quit pipe"); |
273ea72c DG |
359 | goto error; |
360 | } | |
361 | ||
730389d9 DG |
362 | for (i = 0; i < 2; i++) { |
363 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
364 | if (ret < 0) { | |
365 | PERROR("fcntl"); | |
366 | goto error; | |
367 | } | |
368 | } | |
369 | ||
273ea72c DG |
370 | error: |
371 | return ret; | |
372 | } | |
373 | ||
099e26bd DG |
374 | /* |
375 | * Stop all threads by closing the thread quit pipe. | |
376 | */ | |
cf3af59e MD |
377 | static void stop_threads(void) |
378 | { | |
5eb91c98 DG |
379 | int ret; |
380 | ||
cf3af59e MD |
381 | /* Stopping all threads */ |
382 | DBG("Terminating all threads"); | |
54d01ffb | 383 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
384 | if (ret < 0) { |
385 | ERR("write error on thread quit pipe"); | |
386 | } | |
387 | ||
099e26bd | 388 | /* Dispatch thread */ |
26c9d55e | 389 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 390 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
391 | } |
392 | ||
e975f9f8 DG |
393 | /* |
394 | * Close every consumer sockets. | |
395 | */ | |
396 | static void close_consumer_sockets(void) | |
397 | { | |
398 | int ret; | |
399 | ||
400 | if (kconsumer_data.err_sock >= 0) { | |
401 | ret = close(kconsumer_data.err_sock); | |
402 | if (ret < 0) { | |
403 | PERROR("kernel consumer err_sock close"); | |
404 | } | |
405 | } | |
406 | if (ustconsumer32_data.err_sock >= 0) { | |
407 | ret = close(ustconsumer32_data.err_sock); | |
408 | if (ret < 0) { | |
a76cbd9f | 409 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
410 | } |
411 | } | |
412 | if (ustconsumer64_data.err_sock >= 0) { | |
413 | ret = close(ustconsumer64_data.err_sock); | |
414 | if (ret < 0) { | |
a76cbd9f | 415 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
416 | } |
417 | } | |
418 | if (kconsumer_data.cmd_sock >= 0) { | |
419 | ret = close(kconsumer_data.cmd_sock); | |
420 | if (ret < 0) { | |
421 | PERROR("kernel consumer cmd_sock close"); | |
422 | } | |
423 | } | |
424 | if (ustconsumer32_data.cmd_sock >= 0) { | |
425 | ret = close(ustconsumer32_data.cmd_sock); | |
426 | if (ret < 0) { | |
a76cbd9f | 427 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
428 | } |
429 | } | |
430 | if (ustconsumer64_data.cmd_sock >= 0) { | |
431 | ret = close(ustconsumer64_data.cmd_sock); | |
432 | if (ret < 0) { | |
a76cbd9f | 433 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
434 | } |
435 | } | |
436 | } | |
437 | ||
fac6795d | 438 | /* |
d063d709 | 439 | * Cleanup the daemon |
fac6795d | 440 | */ |
cf3af59e | 441 | static void cleanup(void) |
fac6795d | 442 | { |
ef599319 | 443 | int ret; |
6620da75 | 444 | char *cmd = NULL; |
af9737e9 | 445 | struct ltt_session *sess, *stmp; |
fac6795d | 446 | |
1d4b027a | 447 | DBG("Cleaning up"); |
e07ae692 | 448 | |
2f77fc4b DG |
449 | /* First thing first, stop all threads */ |
450 | utils_close_pipe(thread_quit_pipe); | |
451 | ||
35f90c40 DG |
452 | /* |
453 | * If opt_pidfile is undefined, the default file will be wiped when | |
454 | * removing the rundir. | |
455 | */ | |
456 | if (opt_pidfile) { | |
457 | ret = remove(opt_pidfile); | |
458 | if (ret < 0) { | |
459 | PERROR("remove pidfile %s", opt_pidfile); | |
460 | } | |
461 | } | |
462 | ||
67e40797 DG |
463 | DBG("Removing %s directory", rundir); |
464 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
465 | if (ret < 0) { | |
466 | ERR("asprintf failed. Something is really wrong!"); | |
467 | } | |
5461b305 | 468 | |
67e40797 DG |
469 | /* Remove lttng run directory */ |
470 | ret = system(cmd); | |
471 | if (ret < 0) { | |
472 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 473 | } |
67e40797 | 474 | free(cmd); |
bd69add2 | 475 | free(rundir); |
5461b305 | 476 | |
99bab54f | 477 | DBG("Cleaning up all sessions"); |
fac6795d | 478 | |
b5541356 | 479 | /* Destroy session list mutex */ |
273ea72c DG |
480 | if (session_list_ptr != NULL) { |
481 | pthread_mutex_destroy(&session_list_ptr->lock); | |
482 | ||
483 | /* Cleanup ALL session */ | |
54d01ffb DG |
484 | cds_list_for_each_entry_safe(sess, stmp, |
485 | &session_list_ptr->head, list) { | |
2f77fc4b | 486 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
487 | } |
488 | } | |
489 | ||
099e26bd | 490 | DBG("Closing all UST sockets"); |
56fff090 | 491 | ust_app_clean_list(); |
7972aab2 | 492 | buffer_reg_destroy_registries(); |
099e26bd | 493 | |
4fba7219 DG |
494 | if (is_root && !opt_no_kernel) { |
495 | DBG2("Closing kernel fd"); | |
a4b35e07 | 496 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
497 | ret = close(kernel_tracer_fd); |
498 | if (ret) { | |
499 | PERROR("close"); | |
500 | } | |
a4b35e07 | 501 | } |
2f50c8a3 | 502 | DBG("Unloading kernel modules"); |
096102bd | 503 | modprobe_remove_lttng_all(); |
2f50c8a3 | 504 | } |
2f77fc4b | 505 | |
e975f9f8 DG |
506 | close_consumer_sockets(); |
507 | ||
421cb601 | 508 | /* <fun> */ |
f56a39af | 509 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
510 | "Matthew, BEET driven development works!%c[%dm", |
511 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
512 | /* </fun> */ | |
fac6795d DG |
513 | } |
514 | ||
e065084a | 515 | /* |
d063d709 | 516 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 517 | * |
d063d709 | 518 | * Return lttcomm error code. |
e065084a DG |
519 | */ |
520 | static int send_unix_sock(int sock, void *buf, size_t len) | |
521 | { | |
522 | /* Check valid length */ | |
c617c0c6 | 523 | if (len == 0) { |
e065084a DG |
524 | return -1; |
525 | } | |
526 | ||
527 | return lttcomm_send_unix_sock(sock, buf, len); | |
528 | } | |
529 | ||
5461b305 | 530 | /* |
d063d709 | 531 | * Free memory of a command context structure. |
5461b305 | 532 | */ |
a2fb29a5 | 533 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 534 | { |
a2fb29a5 DG |
535 | DBG("Clean command context structure"); |
536 | if (*cmd_ctx) { | |
537 | if ((*cmd_ctx)->llm) { | |
538 | free((*cmd_ctx)->llm); | |
5461b305 | 539 | } |
a2fb29a5 DG |
540 | if ((*cmd_ctx)->lsm) { |
541 | free((*cmd_ctx)->lsm); | |
5461b305 | 542 | } |
a2fb29a5 DG |
543 | free(*cmd_ctx); |
544 | *cmd_ctx = NULL; | |
5461b305 DG |
545 | } |
546 | } | |
547 | ||
fac6795d | 548 | /* |
0fdd1e2c | 549 | * Notify UST applications using the shm mmap futex. |
fac6795d | 550 | */ |
0fdd1e2c | 551 | static int notify_ust_apps(int active) |
fac6795d | 552 | { |
0fdd1e2c | 553 | char *wait_shm_mmap; |
fac6795d | 554 | |
0fdd1e2c | 555 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 556 | |
0fdd1e2c DG |
557 | /* See shm.c for this call implying mmap, shm and futex calls */ |
558 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
559 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
560 | goto error; |
561 | } | |
562 | ||
0fdd1e2c DG |
563 | /* Wake waiting process */ |
564 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
565 | ||
566 | /* Apps notified successfully */ | |
567 | return 0; | |
fac6795d DG |
568 | |
569 | error: | |
0fdd1e2c | 570 | return -1; |
fac6795d DG |
571 | } |
572 | ||
e065084a | 573 | /* |
d063d709 DG |
574 | * Setup the outgoing data buffer for the response (llm) by allocating the |
575 | * right amount of memory and copying the original information from the lsm | |
576 | * structure. | |
ca95a216 | 577 | * |
d063d709 | 578 | * Return total size of the buffer pointed by buf. |
ca95a216 | 579 | */ |
5461b305 | 580 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 581 | { |
f3ed775e | 582 | int ret, buf_size; |
ca95a216 | 583 | |
f3ed775e | 584 | buf_size = size; |
5461b305 | 585 | |
ba7f0ae5 | 586 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 587 | if (cmd_ctx->llm == NULL) { |
76d7553f | 588 | PERROR("zmalloc"); |
5461b305 | 589 | ret = -ENOMEM; |
ca95a216 DG |
590 | goto error; |
591 | } | |
592 | ||
5461b305 DG |
593 | /* Copy common data */ |
594 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 595 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 596 | |
5461b305 DG |
597 | cmd_ctx->llm->data_size = size; |
598 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
599 | ||
ca95a216 DG |
600 | return buf_size; |
601 | ||
602 | error: | |
603 | return ret; | |
604 | } | |
605 | ||
7a485870 | 606 | /* |
5eb91c98 | 607 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 608 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 609 | */ |
5eb91c98 | 610 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 611 | { |
5eb91c98 | 612 | int ret; |
7a485870 DG |
613 | struct ltt_session *session; |
614 | struct ltt_kernel_channel *channel; | |
615 | ||
5eb91c98 | 616 | DBG("Updating kernel poll set"); |
7a485870 | 617 | |
54d01ffb | 618 | session_lock_list(); |
b5541356 | 619 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 620 | session_lock(session); |
7a485870 | 621 | if (session->kernel_session == NULL) { |
54d01ffb | 622 | session_unlock(session); |
7a485870 DG |
623 | continue; |
624 | } | |
7a485870 | 625 | |
54d01ffb DG |
626 | cds_list_for_each_entry(channel, |
627 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
628 | /* Add channel fd to the kernel poll set */ |
629 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
630 | if (ret < 0) { | |
54d01ffb | 631 | session_unlock(session); |
5eb91c98 DG |
632 | goto error; |
633 | } | |
634 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 635 | } |
54d01ffb | 636 | session_unlock(session); |
7a485870 | 637 | } |
54d01ffb | 638 | session_unlock_list(); |
7a485870 | 639 | |
5eb91c98 | 640 | return 0; |
7a485870 DG |
641 | |
642 | error: | |
54d01ffb | 643 | session_unlock_list(); |
7a485870 DG |
644 | return -1; |
645 | } | |
646 | ||
647 | /* | |
54d01ffb | 648 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 649 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 650 | * |
d063d709 | 651 | * Useful for CPU hotplug feature. |
7a485870 | 652 | */ |
2bdd86d4 | 653 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
654 | { |
655 | int ret = 0; | |
656 | struct ltt_session *session; | |
173af62f | 657 | struct ltt_kernel_session *ksess; |
7a485870 DG |
658 | struct ltt_kernel_channel *channel; |
659 | ||
660 | DBG("Updating kernel streams for channel fd %d", fd); | |
661 | ||
54d01ffb | 662 | session_lock_list(); |
b5541356 | 663 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 664 | session_lock(session); |
7a485870 | 665 | if (session->kernel_session == NULL) { |
54d01ffb | 666 | session_unlock(session); |
7a485870 DG |
667 | continue; |
668 | } | |
173af62f | 669 | ksess = session->kernel_session; |
d9800920 | 670 | |
173af62f | 671 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
672 | if (channel->fd == fd) { |
673 | DBG("Channel found, updating kernel streams"); | |
674 | ret = kernel_open_channel_stream(channel); | |
675 | if (ret < 0) { | |
b3c750d2 | 676 | goto error; |
7a485870 | 677 | } |
d9800920 | 678 | |
7a485870 | 679 | /* |
5eb91c98 DG |
680 | * Have we already sent fds to the consumer? If yes, it means |
681 | * that tracing is started so it is safe to send our updated | |
682 | * stream fds. | |
7a485870 | 683 | */ |
173af62f DG |
684 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
685 | struct lttng_ht_iter iter; | |
686 | struct consumer_socket *socket; | |
687 | ||
e7fe706f | 688 | rcu_read_lock(); |
173af62f DG |
689 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
690 | &iter.iter, socket, node.node) { | |
691 | /* Code flow error */ | |
692 | assert(socket->fd >= 0); | |
693 | ||
694 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 695 | ret = kernel_consumer_send_channel_stream(socket, |
2bba9e53 DG |
696 | channel, ksess, |
697 | session->output_traces ? 1 : 0); | |
173af62f DG |
698 | pthread_mutex_unlock(socket->lock); |
699 | if (ret < 0) { | |
e7fe706f | 700 | rcu_read_unlock(); |
173af62f DG |
701 | goto error; |
702 | } | |
7a485870 | 703 | } |
e7fe706f | 704 | rcu_read_unlock(); |
7a485870 | 705 | } |
b3c750d2 | 706 | goto error; |
7a485870 DG |
707 | } |
708 | } | |
54d01ffb | 709 | session_unlock(session); |
7a485870 | 710 | } |
54d01ffb | 711 | session_unlock_list(); |
b3c750d2 | 712 | return ret; |
7a485870 | 713 | |
b3c750d2 | 714 | error: |
54d01ffb DG |
715 | session_unlock(session); |
716 | session_unlock_list(); | |
7a485870 DG |
717 | return ret; |
718 | } | |
719 | ||
487cf67c | 720 | /* |
ffe60014 DG |
721 | * For each tracing session, update newly registered apps. The session list |
722 | * lock MUST be acquired before calling this. | |
487cf67c DG |
723 | */ |
724 | static void update_ust_app(int app_sock) | |
725 | { | |
726 | struct ltt_session *sess, *stmp; | |
727 | ||
728 | /* For all tracing session(s) */ | |
729 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 730 | session_lock(sess); |
421cb601 DG |
731 | if (sess->ust_session) { |
732 | ust_app_global_update(sess->ust_session, app_sock); | |
733 | } | |
4ee14516 | 734 | session_unlock(sess); |
487cf67c DG |
735 | } |
736 | } | |
737 | ||
7a485870 | 738 | /* |
d063d709 | 739 | * This thread manage event coming from the kernel. |
7a485870 | 740 | * |
d063d709 DG |
741 | * Features supported in this thread: |
742 | * -) CPU Hotplug | |
7a485870 DG |
743 | */ |
744 | static void *thread_manage_kernel(void *data) | |
745 | { | |
139ac872 | 746 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 747 | uint32_t revents, nb_fd; |
7a485870 | 748 | char tmp; |
5eb91c98 | 749 | struct lttng_poll_event events; |
7a485870 | 750 | |
6993eeb3 | 751 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 752 | |
927ca06a DG |
753 | health_register(HEALTH_TYPE_KERNEL); |
754 | ||
d5d63bf1 DG |
755 | /* |
756 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 757 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 758 | */ |
6d737ce4 | 759 | lttng_poll_init(&events); |
d5d63bf1 | 760 | |
6993eeb3 CB |
761 | if (testpoint(thread_manage_kernel)) { |
762 | goto error_testpoint; | |
763 | } | |
8ac94142 | 764 | |
840cb59c | 765 | health_code_update(); |
44a5e5eb | 766 | |
6993eeb3 | 767 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 768 | goto error_testpoint; |
6993eeb3 CB |
769 | } |
770 | ||
7a485870 | 771 | while (1) { |
840cb59c | 772 | health_code_update(); |
44a5e5eb | 773 | |
7a485870 | 774 | if (update_poll_flag == 1) { |
d21b0d71 DG |
775 | /* Clean events object. We are about to populate it again. */ |
776 | lttng_poll_clean(&events); | |
777 | ||
d0b96690 | 778 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
779 | if (ret < 0) { |
780 | goto error_poll_create; | |
781 | } | |
782 | ||
783 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
784 | if (ret < 0) { | |
785 | goto error; | |
786 | } | |
5f822d0a | 787 | |
d21b0d71 | 788 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
789 | ret = update_kernel_poll(&events); |
790 | if (ret < 0) { | |
7a485870 DG |
791 | goto error; |
792 | } | |
793 | update_poll_flag = 0; | |
794 | } | |
795 | ||
d21b0d71 | 796 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
797 | |
798 | /* Poll infinite value of time */ | |
88f2b785 | 799 | restart: |
a78af745 | 800 | health_poll_entry(); |
5eb91c98 | 801 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 802 | health_poll_exit(); |
7a485870 | 803 | if (ret < 0) { |
88f2b785 MD |
804 | /* |
805 | * Restart interrupted system call. | |
806 | */ | |
807 | if (errno == EINTR) { | |
808 | goto restart; | |
809 | } | |
7a485870 DG |
810 | goto error; |
811 | } else if (ret == 0) { | |
812 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
813 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
814 | "This should not have happened! Continuing..."); | |
7a485870 DG |
815 | continue; |
816 | } | |
817 | ||
0d9c5d77 DG |
818 | nb_fd = ret; |
819 | ||
5eb91c98 DG |
820 | for (i = 0; i < nb_fd; i++) { |
821 | /* Fetch once the poll data */ | |
822 | revents = LTTNG_POLL_GETEV(&events, i); | |
823 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 824 | |
840cb59c | 825 | health_code_update(); |
44a5e5eb | 826 | |
5eb91c98 | 827 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 828 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 829 | if (ret) { |
139ac872 MD |
830 | err = 0; |
831 | goto exit; | |
5eb91c98 | 832 | } |
7a485870 | 833 | |
5eb91c98 DG |
834 | /* Check for data on kernel pipe */ |
835 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
836 | do { |
837 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
838 | } while (ret < 0 && errno == EINTR); | |
839 | /* | |
840 | * Ret value is useless here, if this pipe gets any actions an | |
841 | * update is required anyway. | |
842 | */ | |
5eb91c98 DG |
843 | update_poll_flag = 1; |
844 | continue; | |
845 | } else { | |
846 | /* | |
847 | * New CPU detected by the kernel. Adding kernel stream to | |
848 | * kernel session and updating the kernel consumer | |
849 | */ | |
850 | if (revents & LPOLLIN) { | |
2bdd86d4 | 851 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
852 | if (ret < 0) { |
853 | continue; | |
854 | } | |
855 | break; | |
856 | /* | |
857 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
858 | * and unregister kernel stream at this point. | |
859 | */ | |
7a485870 | 860 | } |
7a485870 DG |
861 | } |
862 | } | |
863 | } | |
864 | ||
139ac872 | 865 | exit: |
7a485870 | 866 | error: |
5eb91c98 | 867 | lttng_poll_clean(&events); |
76d7553f | 868 | error_poll_create: |
6993eeb3 | 869 | error_testpoint: |
6620da75 DG |
870 | utils_close_pipe(kernel_poll_pipe); |
871 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 872 | if (err) { |
840cb59c | 873 | health_error(); |
139ac872 | 874 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
875 | WARN("Kernel thread died unexpectedly. " |
876 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 877 | } |
927ca06a | 878 | health_unregister(); |
76d7553f | 879 | DBG("Kernel thread dying"); |
7a485870 DG |
880 | return NULL; |
881 | } | |
882 | ||
a23ec3a7 DG |
883 | /* |
884 | * Signal pthread condition of the consumer data that the thread. | |
885 | */ | |
886 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
887 | { | |
888 | pthread_mutex_lock(&data->cond_mutex); | |
889 | ||
890 | /* | |
891 | * The state is set before signaling. It can be any value, it's the waiter | |
892 | * job to correctly interpret this condition variable associated to the | |
893 | * consumer pthread_cond. | |
894 | * | |
895 | * A value of 0 means that the corresponding thread of the consumer data | |
896 | * was not started. 1 indicates that the thread has started and is ready | |
897 | * for action. A negative value means that there was an error during the | |
898 | * thread bootstrap. | |
899 | */ | |
900 | data->consumer_thread_is_ready = state; | |
901 | (void) pthread_cond_signal(&data->cond); | |
902 | ||
903 | pthread_mutex_unlock(&data->cond_mutex); | |
904 | } | |
905 | ||
1d4b027a | 906 | /* |
3bd1e081 | 907 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 908 | */ |
3bd1e081 | 909 | static void *thread_manage_consumer(void *data) |
1d4b027a | 910 | { |
139ac872 | 911 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 912 | uint32_t revents, nb_fd; |
1d4b027a | 913 | enum lttcomm_return_code code; |
5eb91c98 | 914 | struct lttng_poll_event events; |
3bd1e081 | 915 | struct consumer_data *consumer_data = data; |
1d4b027a | 916 | |
3bd1e081 | 917 | DBG("[thread] Manage consumer started"); |
1d4b027a | 918 | |
927ca06a DG |
919 | health_register(HEALTH_TYPE_CONSUMER); |
920 | ||
855060f8 | 921 | health_code_update(); |
9449cc75 | 922 | |
5eb91c98 | 923 | /* |
331744e3 JD |
924 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
925 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 926 | */ |
331744e3 | 927 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 928 | if (ret < 0) { |
76d7553f | 929 | goto error_poll; |
5eb91c98 | 930 | } |
273ea72c | 931 | |
edb8b045 DG |
932 | /* |
933 | * The error socket here is already in a listening state which was done | |
934 | * just before spawning this thread to avoid a race between the consumer | |
935 | * daemon exec trying to connect and the listen() call. | |
936 | */ | |
3bd1e081 | 937 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
938 | if (ret < 0) { |
939 | goto error; | |
940 | } | |
941 | ||
840cb59c | 942 | health_code_update(); |
44a5e5eb | 943 | |
331744e3 | 944 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 945 | restart: |
a78af745 | 946 | health_poll_entry(); |
8ac94142 | 947 | |
6993eeb3 CB |
948 | if (testpoint(thread_manage_consumer)) { |
949 | goto error; | |
950 | } | |
8ac94142 | 951 | |
5eb91c98 | 952 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 953 | health_poll_exit(); |
273ea72c | 954 | if (ret < 0) { |
88f2b785 MD |
955 | /* |
956 | * Restart interrupted system call. | |
957 | */ | |
958 | if (errno == EINTR) { | |
959 | goto restart; | |
960 | } | |
273ea72c DG |
961 | goto error; |
962 | } | |
963 | ||
0d9c5d77 DG |
964 | nb_fd = ret; |
965 | ||
5eb91c98 DG |
966 | for (i = 0; i < nb_fd; i++) { |
967 | /* Fetch once the poll data */ | |
968 | revents = LTTNG_POLL_GETEV(&events, i); | |
969 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
970 | ||
840cb59c | 971 | health_code_update(); |
44a5e5eb | 972 | |
5eb91c98 | 973 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 974 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 975 | if (ret) { |
139ac872 MD |
976 | err = 0; |
977 | goto exit; | |
5eb91c98 DG |
978 | } |
979 | ||
980 | /* Event on the registration socket */ | |
3bd1e081 | 981 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 982 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 983 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
984 | goto error; |
985 | } | |
986 | } | |
273ea72c DG |
987 | } |
988 | ||
3bd1e081 | 989 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
990 | if (sock < 0) { |
991 | goto error; | |
992 | } | |
993 | ||
b662582b DG |
994 | /* |
995 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
996 | * show must go on. | |
997 | */ | |
998 | (void) utils_set_fd_cloexec(sock); | |
999 | ||
840cb59c | 1000 | health_code_update(); |
44a5e5eb | 1001 | |
3bd1e081 | 1002 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1003 | |
712ea556 | 1004 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1005 | ret = lttcomm_recv_unix_sock(sock, &code, |
1006 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1007 | if (ret <= 0) { |
1008 | goto error; | |
1009 | } | |
1010 | ||
840cb59c | 1011 | health_code_update(); |
44a5e5eb | 1012 | |
f73fabfd | 1013 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1014 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1015 | consumer_data->cmd_sock = |
1016 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
331744e3 JD |
1017 | consumer_data->metadata_sock.fd = |
1018 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1019 | if (consumer_data->cmd_sock < 0 || | |
1020 | consumer_data->metadata_sock.fd < 0) { | |
1021 | PERROR("consumer connect cmd socket"); | |
a23ec3a7 DG |
1022 | /* On error, signal condition and quit. */ |
1023 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1024 | goto error; |
1025 | } | |
331744e3 JD |
1026 | /* Create metadata socket lock. */ |
1027 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1028 | if (consumer_data->metadata_sock.lock == NULL) { | |
1029 | PERROR("zmalloc pthread mutex"); | |
1030 | ret = -1; | |
1031 | goto error; | |
1032 | } | |
1033 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1034 | ||
a23ec3a7 | 1035 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1036 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1037 | DBG("Consumer metadata socket ready (fd: %d)", | |
1038 | consumer_data->metadata_sock.fd); | |
1d4b027a | 1039 | } else { |
3bd1e081 | 1040 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1041 | lttcomm_get_readable_code(-code)); |
1042 | goto error; | |
1043 | } | |
1044 | ||
331744e3 | 1045 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1046 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1047 | if (ret < 0) { |
72079cae DG |
1048 | goto error; |
1049 | } | |
1050 | ||
331744e3 | 1051 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1052 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1053 | if (ret < 0) { | |
72079cae | 1054 | goto error; |
5eb91c98 DG |
1055 | } |
1056 | ||
331744e3 JD |
1057 | /* Add metadata socket that is successfully connected. */ |
1058 | ret = lttng_poll_add(&events, consumer_data->metadata_sock.fd, | |
1059 | LPOLLIN | LPOLLRDHUP); | |
1060 | if (ret < 0) { | |
1061 | goto error; | |
1062 | } | |
1063 | ||
840cb59c | 1064 | health_code_update(); |
44a5e5eb | 1065 | |
331744e3 | 1066 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1067 | restart_poll: |
331744e3 JD |
1068 | while (1) { |
1069 | health_poll_entry(); | |
1070 | ret = lttng_poll_wait(&events, -1); | |
1071 | health_poll_exit(); | |
1072 | if (ret < 0) { | |
1073 | /* | |
1074 | * Restart interrupted system call. | |
1075 | */ | |
1076 | if (errno == EINTR) { | |
1077 | goto restart_poll; | |
1078 | } | |
1079 | goto error; | |
88f2b785 | 1080 | } |
72079cae | 1081 | |
331744e3 | 1082 | nb_fd = ret; |
0d9c5d77 | 1083 | |
331744e3 JD |
1084 | for (i = 0; i < nb_fd; i++) { |
1085 | /* Fetch once the poll data */ | |
1086 | revents = LTTNG_POLL_GETEV(&events, i); | |
1087 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1088 | |
331744e3 | 1089 | health_code_update(); |
44a5e5eb | 1090 | |
331744e3 JD |
1091 | /* Thread quit pipe has been closed. Killing thread. */ |
1092 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
1093 | if (ret) { | |
1094 | err = 0; | |
1095 | goto exit; | |
1096 | } | |
5eb91c98 | 1097 | |
331744e3 JD |
1098 | if (pollfd == sock) { |
1099 | /* Event on the consumerd socket */ | |
1100 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1101 | ERR("consumer err socket second poll error"); | |
1102 | goto error; | |
1103 | } | |
1104 | health_code_update(); | |
1105 | /* Wait for any kconsumerd error */ | |
1106 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1107 | sizeof(enum lttcomm_return_code)); | |
1108 | if (ret <= 0) { | |
1109 | ERR("consumer closed the command socket"); | |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | ERR("consumer return code : %s", | |
1114 | lttcomm_get_readable_code(-code)); | |
1115 | ||
1116 | goto exit; | |
1117 | } else if (pollfd == consumer_data->metadata_sock.fd) { | |
1118 | /* UST metadata requests */ | |
1119 | ret = ust_consumer_metadata_request( | |
1120 | &consumer_data->metadata_sock); | |
1121 | if (ret < 0) { | |
1122 | ERR("Handling metadata request"); | |
1123 | goto error; | |
1124 | } | |
1125 | break; | |
1126 | } else { | |
1127 | ERR("Unknown pollfd"); | |
5eb91c98 DG |
1128 | goto error; |
1129 | } | |
1130 | } | |
331744e3 | 1131 | health_code_update(); |
5eb91c98 DG |
1132 | } |
1133 | ||
139ac872 | 1134 | exit: |
1d4b027a | 1135 | error: |
5c827ce0 DG |
1136 | /* Immediately set the consumerd state to stopped */ |
1137 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1138 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1139 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1140 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1141 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1142 | } else { | |
1143 | /* Code flow error... */ | |
1144 | assert(0); | |
1145 | } | |
1146 | ||
76d7553f MD |
1147 | if (consumer_data->err_sock >= 0) { |
1148 | ret = close(consumer_data->err_sock); | |
1149 | if (ret) { | |
1150 | PERROR("close"); | |
1151 | } | |
a76cbd9f | 1152 | consumer_data->err_sock = -1; |
76d7553f MD |
1153 | } |
1154 | if (consumer_data->cmd_sock >= 0) { | |
1155 | ret = close(consumer_data->cmd_sock); | |
1156 | if (ret) { | |
1157 | PERROR("close"); | |
1158 | } | |
a76cbd9f | 1159 | consumer_data->cmd_sock = -1; |
76d7553f | 1160 | } |
331744e3 JD |
1161 | if (consumer_data->metadata_sock.fd >= 0) { |
1162 | ret = close(consumer_data->metadata_sock.fd); | |
1163 | if (ret) { | |
1164 | PERROR("close"); | |
1165 | } | |
1166 | } | |
1167 | /* Cleanup metadata socket mutex. */ | |
1168 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1169 | free(consumer_data->metadata_sock.lock); | |
1170 | ||
76d7553f MD |
1171 | if (sock >= 0) { |
1172 | ret = close(sock); | |
1173 | if (ret) { | |
1174 | PERROR("close"); | |
1175 | } | |
1176 | } | |
273ea72c | 1177 | |
3bd1e081 MD |
1178 | unlink(consumer_data->err_unix_sock_path); |
1179 | unlink(consumer_data->cmd_unix_sock_path); | |
1180 | consumer_data->pid = 0; | |
1d4b027a | 1181 | |
5eb91c98 | 1182 | lttng_poll_clean(&events); |
76d7553f | 1183 | error_poll: |
139ac872 | 1184 | if (err) { |
840cb59c | 1185 | health_error(); |
139ac872 MD |
1186 | ERR("Health error occurred in %s", __func__); |
1187 | } | |
927ca06a | 1188 | health_unregister(); |
76d7553f | 1189 | DBG("consumer thread cleanup completed"); |
0177d773 | 1190 | |
5eb91c98 | 1191 | return NULL; |
099e26bd DG |
1192 | } |
1193 | ||
099e26bd DG |
1194 | /* |
1195 | * This thread manage application communication. | |
1d4b027a DG |
1196 | */ |
1197 | static void *thread_manage_apps(void *data) | |
099e26bd | 1198 | { |
139ac872 | 1199 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1200 | uint32_t revents, nb_fd; |
5eb91c98 | 1201 | struct lttng_poll_event events; |
099e26bd DG |
1202 | |
1203 | DBG("[thread] Manage application started"); | |
1204 | ||
f6a9efaa DG |
1205 | rcu_register_thread(); |
1206 | rcu_thread_online(); | |
1207 | ||
927ca06a DG |
1208 | health_register(HEALTH_TYPE_APP_MANAGE); |
1209 | ||
6993eeb3 CB |
1210 | if (testpoint(thread_manage_apps)) { |
1211 | goto error_testpoint; | |
1212 | } | |
1213 | ||
840cb59c | 1214 | health_code_update(); |
44a5e5eb | 1215 | |
d0b96690 | 1216 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1217 | if (ret < 0) { |
76d7553f | 1218 | goto error_poll_create; |
5eb91c98 | 1219 | } |
099e26bd | 1220 | |
5eb91c98 DG |
1221 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1222 | if (ret < 0) { | |
1223 | goto error; | |
1224 | } | |
099e26bd | 1225 | |
6993eeb3 CB |
1226 | if (testpoint(thread_manage_apps_before_loop)) { |
1227 | goto error; | |
1228 | } | |
8ac94142 | 1229 | |
840cb59c | 1230 | health_code_update(); |
44a5e5eb | 1231 | |
5eb91c98 | 1232 | while (1) { |
d21b0d71 | 1233 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1234 | |
1235 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1236 | restart: |
a78af745 | 1237 | health_poll_entry(); |
5eb91c98 | 1238 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1239 | health_poll_exit(); |
099e26bd | 1240 | if (ret < 0) { |
88f2b785 MD |
1241 | /* |
1242 | * Restart interrupted system call. | |
1243 | */ | |
1244 | if (errno == EINTR) { | |
1245 | goto restart; | |
1246 | } | |
099e26bd DG |
1247 | goto error; |
1248 | } | |
1249 | ||
0d9c5d77 DG |
1250 | nb_fd = ret; |
1251 | ||
5eb91c98 DG |
1252 | for (i = 0; i < nb_fd; i++) { |
1253 | /* Fetch once the poll data */ | |
1254 | revents = LTTNG_POLL_GETEV(&events, i); | |
1255 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1256 | ||
840cb59c | 1257 | health_code_update(); |
44a5e5eb | 1258 | |
5eb91c98 | 1259 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1260 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1261 | if (ret) { |
139ac872 MD |
1262 | err = 0; |
1263 | goto exit; | |
5eb91c98 | 1264 | } |
099e26bd | 1265 | |
5eb91c98 DG |
1266 | /* Inspect the apps cmd pipe */ |
1267 | if (pollfd == apps_cmd_pipe[0]) { | |
1268 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1269 | ERR("Apps command pipe error"); | |
0177d773 | 1270 | goto error; |
5eb91c98 | 1271 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1272 | int sock; |
1273 | ||
5eb91c98 | 1274 | /* Empty pipe */ |
f921c78f | 1275 | do { |
d0b96690 | 1276 | ret = read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
f921c78f | 1277 | } while (ret < 0 && errno == EINTR); |
d0b96690 | 1278 | if (ret < 0 || ret < sizeof(sock)) { |
76d7553f | 1279 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1280 | goto error; |
1281 | } | |
099e26bd | 1282 | |
840cb59c | 1283 | health_code_update(); |
44a5e5eb | 1284 | |
ffe60014 | 1285 | /* |
d0b96690 DG |
1286 | * We only monitor the error events of the socket. This |
1287 | * thread does not handle any incoming data from UST | |
1288 | * (POLLIN). | |
ffe60014 | 1289 | */ |
d0b96690 DG |
1290 | ret = lttng_poll_add(&events, sock, |
1291 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1292 | if (ret < 0) { | |
5eb91c98 | 1293 | goto error; |
e0c7ec2b | 1294 | } |
acc7b41b | 1295 | |
d0b96690 DG |
1296 | /* Set socket timeout for both receiving and ending */ |
1297 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
1298 | app_socket_timeout); | |
1299 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
1300 | app_socket_timeout); | |
ae9e45b3 | 1301 | |
d0b96690 | 1302 | DBG("Apps with sock %d added to poll set", sock); |
487cf67c | 1303 | |
840cb59c | 1304 | health_code_update(); |
44a5e5eb | 1305 | |
5eb91c98 | 1306 | break; |
0177d773 | 1307 | } |
5eb91c98 DG |
1308 | } else { |
1309 | /* | |
54d01ffb DG |
1310 | * At this point, we know that a registered application made |
1311 | * the event at poll_wait. | |
5eb91c98 DG |
1312 | */ |
1313 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1314 | /* Removing from the poll set */ | |
1315 | ret = lttng_poll_del(&events, pollfd); | |
1316 | if (ret < 0) { | |
1317 | goto error; | |
1318 | } | |
099e26bd | 1319 | |
b9d9b220 | 1320 | /* Socket closed on remote end. */ |
56fff090 | 1321 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1322 | break; |
1323 | } | |
099e26bd | 1324 | } |
44a5e5eb | 1325 | |
840cb59c | 1326 | health_code_update(); |
099e26bd | 1327 | } |
099e26bd DG |
1328 | } |
1329 | ||
139ac872 | 1330 | exit: |
099e26bd | 1331 | error: |
5eb91c98 | 1332 | lttng_poll_clean(&events); |
76d7553f | 1333 | error_poll_create: |
6993eeb3 | 1334 | error_testpoint: |
6620da75 DG |
1335 | utils_close_pipe(apps_cmd_pipe); |
1336 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1337 | ||
1338 | /* | |
1339 | * We don't clean the UST app hash table here since already registered | |
1340 | * applications can still be controlled so let them be until the session | |
1341 | * daemon dies or the applications stop. | |
1342 | */ | |
1343 | ||
139ac872 | 1344 | if (err) { |
840cb59c | 1345 | health_error(); |
139ac872 MD |
1346 | ERR("Health error occurred in %s", __func__); |
1347 | } | |
927ca06a | 1348 | health_unregister(); |
76d7553f | 1349 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1350 | rcu_thread_offline(); |
1351 | rcu_unregister_thread(); | |
099e26bd DG |
1352 | return NULL; |
1353 | } | |
1354 | ||
d0b96690 | 1355 | /* |
d88aee68 DG |
1356 | * Send a socket to a thread This is called from the dispatch UST registration |
1357 | * thread once all sockets are set for the application. | |
d0b96690 DG |
1358 | * |
1359 | * On success, return 0 else a negative value being the errno message of the | |
1360 | * write(). | |
1361 | */ | |
d88aee68 | 1362 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 DG |
1363 | { |
1364 | int ret; | |
1365 | ||
d0b96690 | 1366 | /* Sockets MUST be set or else this should not have been called. */ |
d88aee68 DG |
1367 | assert(fd >= 0); |
1368 | assert(sock >= 0); | |
d0b96690 DG |
1369 | |
1370 | do { | |
d88aee68 | 1371 | ret = write(fd, &sock, sizeof(sock)); |
d0b96690 | 1372 | } while (ret < 0 && errno == EINTR); |
d88aee68 DG |
1373 | if (ret < 0 || ret != sizeof(sock)) { |
1374 | PERROR("write apps pipe %d", fd); | |
d0b96690 DG |
1375 | if (ret < 0) { |
1376 | ret = -errno; | |
1377 | } | |
1378 | goto error; | |
1379 | } | |
1380 | ||
1381 | /* All good. Don't send back the write positive ret value. */ | |
1382 | ret = 0; | |
1383 | error: | |
1384 | return ret; | |
1385 | } | |
1386 | ||
f45e313d DG |
1387 | /* |
1388 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1389 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1390 | * notify socket is never received. | |
1391 | */ | |
1392 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1393 | { | |
1394 | int ret, nb_fd = 0, i; | |
1395 | unsigned int fd_added = 0; | |
1396 | struct lttng_poll_event events; | |
1397 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1398 | ||
1399 | assert(wait_queue); | |
1400 | ||
1401 | lttng_poll_init(&events); | |
1402 | ||
1403 | /* Just skip everything for an empty queue. */ | |
1404 | if (!wait_queue->count) { | |
1405 | goto end; | |
1406 | } | |
1407 | ||
1408 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1409 | if (ret < 0) { | |
1410 | goto error_create; | |
1411 | } | |
1412 | ||
1413 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1414 | &wait_queue->head, head) { | |
1415 | assert(wait_node->app); | |
1416 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1417 | LPOLLHUP | LPOLLERR); | |
1418 | if (ret < 0) { | |
1419 | goto error; | |
1420 | } | |
1421 | ||
1422 | fd_added = 1; | |
1423 | } | |
1424 | ||
1425 | if (!fd_added) { | |
1426 | goto end; | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * Poll but don't block so we can quickly identify the faulty events and | |
1431 | * clean them afterwards from the wait queue. | |
1432 | */ | |
1433 | ret = lttng_poll_wait(&events, 0); | |
1434 | if (ret < 0) { | |
1435 | goto error; | |
1436 | } | |
1437 | nb_fd = ret; | |
1438 | ||
1439 | for (i = 0; i < nb_fd; i++) { | |
1440 | /* Get faulty FD. */ | |
1441 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1442 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1443 | ||
1444 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1445 | &wait_queue->head, head) { | |
1446 | if (pollfd == wait_node->app->sock && | |
1447 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1448 | cds_list_del(&wait_node->head); | |
1449 | wait_queue->count--; | |
1450 | ust_app_destroy(wait_node->app); | |
1451 | free(wait_node); | |
1452 | break; | |
1453 | } | |
1454 | } | |
1455 | } | |
1456 | ||
1457 | if (nb_fd > 0) { | |
1458 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1459 | } | |
1460 | ||
1461 | end: | |
1462 | lttng_poll_clean(&events); | |
1463 | return; | |
1464 | ||
1465 | error: | |
1466 | lttng_poll_clean(&events); | |
1467 | error_create: | |
1468 | ERR("Unable to sanitize wait queue"); | |
1469 | return; | |
1470 | } | |
1471 | ||
099e26bd DG |
1472 | /* |
1473 | * Dispatch request from the registration threads to the application | |
1474 | * communication thread. | |
1475 | */ | |
1476 | static void *thread_dispatch_ust_registration(void *data) | |
1477 | { | |
12e2b881 | 1478 | int ret, err = -1; |
099e26bd DG |
1479 | struct cds_wfq_node *node; |
1480 | struct ust_command *ust_cmd = NULL; | |
f45e313d DG |
1481 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1482 | struct ust_reg_wait_queue wait_queue = { | |
1483 | .count = 0, | |
1484 | }; | |
d0b96690 | 1485 | |
12e2b881 MD |
1486 | health_register(HEALTH_TYPE_APP_REG_DISPATCH); |
1487 | ||
1488 | health_code_update(); | |
1489 | ||
f45e313d | 1490 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1491 | |
1492 | DBG("[thread] Dispatch UST command started"); | |
1493 | ||
26c9d55e | 1494 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1495 | health_code_update(); |
1496 | ||
099e26bd DG |
1497 | /* Atomically prepare the queue futex */ |
1498 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1499 | ||
1500 | do { | |
d0b96690 | 1501 | struct ust_app *app = NULL; |
7972aab2 | 1502 | ust_cmd = NULL; |
d0b96690 | 1503 | |
f45e313d DG |
1504 | /* |
1505 | * Make sure we don't have node(s) that have hung up before receiving | |
1506 | * the notify socket. This is to clean the list in order to avoid | |
1507 | * memory leaks from notify socket that are never seen. | |
1508 | */ | |
1509 | sanitize_wait_queue(&wait_queue); | |
1510 | ||
12e2b881 | 1511 | health_code_update(); |
099e26bd DG |
1512 | /* Dequeue command for registration */ |
1513 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1514 | if (node == NULL) { | |
00a17c97 | 1515 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1516 | /* Continue thread execution */ |
1517 | break; | |
1518 | } | |
1519 | ||
1520 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1521 | ||
2f50c8a3 DG |
1522 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1523 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1524 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1525 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1526 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1527 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1528 | |
1529 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1530 | wait_node = zmalloc(sizeof(*wait_node)); | |
1531 | if (!wait_node) { | |
1532 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1533 | ret = close(ust_cmd->sock); |
1534 | if (ret < 0) { | |
1535 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1536 | } | |
1537 | lttng_fd_put(1, LTTNG_FD_APPS); | |
7972aab2 | 1538 | free(ust_cmd); |
d0b96690 DG |
1539 | goto error; |
1540 | } | |
1541 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1542 | ||
1543 | /* Create application object if socket is CMD. */ | |
1544 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1545 | ust_cmd->sock); | |
1546 | if (!wait_node->app) { | |
1547 | ret = close(ust_cmd->sock); | |
1548 | if (ret < 0) { | |
1549 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1550 | } |
d88aee68 DG |
1551 | lttng_fd_put(1, LTTNG_FD_APPS); |
1552 | free(wait_node); | |
7972aab2 | 1553 | free(ust_cmd); |
d0b96690 DG |
1554 | continue; |
1555 | } | |
1556 | /* | |
1557 | * Add application to the wait queue so we can set the notify | |
1558 | * socket before putting this object in the global ht. | |
1559 | */ | |
f45e313d DG |
1560 | cds_list_add(&wait_node->head, &wait_queue.head); |
1561 | wait_queue.count++; | |
d0b96690 | 1562 | |
7972aab2 | 1563 | free(ust_cmd); |
d0b96690 DG |
1564 | /* |
1565 | * We have to continue here since we don't have the notify | |
1566 | * socket and the application MUST be added to the hash table | |
1567 | * only at that moment. | |
1568 | */ | |
1569 | continue; | |
1570 | } else { | |
1571 | /* | |
1572 | * Look for the application in the local wait queue and set the | |
1573 | * notify socket if found. | |
1574 | */ | |
d88aee68 | 1575 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1576 | &wait_queue.head, head) { |
12e2b881 | 1577 | health_code_update(); |
d0b96690 DG |
1578 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1579 | wait_node->app->notify_sock = ust_cmd->sock; | |
1580 | cds_list_del(&wait_node->head); | |
f45e313d | 1581 | wait_queue.count--; |
d0b96690 DG |
1582 | app = wait_node->app; |
1583 | free(wait_node); | |
1584 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1585 | break; | |
1586 | } | |
1587 | } | |
020d7f60 DG |
1588 | |
1589 | /* | |
1590 | * With no application at this stage the received socket is | |
1591 | * basically useless so close it before we free the cmd data | |
1592 | * structure for good. | |
1593 | */ | |
1594 | if (!app) { | |
1595 | ret = close(ust_cmd->sock); | |
1596 | if (ret < 0) { | |
1597 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1598 | } | |
1599 | lttng_fd_put(1, LTTNG_FD_APPS); | |
1600 | } | |
7972aab2 | 1601 | free(ust_cmd); |
d0b96690 DG |
1602 | } |
1603 | ||
1604 | if (app) { | |
d0b96690 DG |
1605 | /* |
1606 | * @session_lock_list | |
1607 | * | |
1608 | * Lock the global session list so from the register up to the | |
1609 | * registration done message, no thread can see the application | |
1610 | * and change its state. | |
1611 | */ | |
1612 | session_lock_list(); | |
1613 | rcu_read_lock(); | |
d88aee68 | 1614 | |
d0b96690 DG |
1615 | /* |
1616 | * Add application to the global hash table. This needs to be | |
1617 | * done before the update to the UST registry can locate the | |
1618 | * application. | |
1619 | */ | |
1620 | ust_app_add(app); | |
d88aee68 DG |
1621 | |
1622 | /* Set app version. This call will print an error if needed. */ | |
1623 | (void) ust_app_version(app); | |
1624 | ||
1625 | /* Send notify socket through the notify pipe. */ | |
1626 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1627 | app->notify_sock); | |
1628 | if (ret < 0) { | |
1629 | rcu_read_unlock(); | |
1630 | session_unlock_list(); | |
1631 | /* No notify thread, stop the UST tracing. */ | |
1632 | goto error; | |
6620da75 | 1633 | } |
d88aee68 | 1634 | |
d0b96690 DG |
1635 | /* |
1636 | * Update newly registered application with the tracing | |
1637 | * registry info already enabled information. | |
1638 | */ | |
1639 | update_ust_app(app->sock); | |
d88aee68 DG |
1640 | |
1641 | /* | |
1642 | * Don't care about return value. Let the manage apps threads | |
1643 | * handle app unregistration upon socket close. | |
1644 | */ | |
1645 | (void) ust_app_register_done(app->sock); | |
1646 | ||
1647 | /* | |
1648 | * Even if the application socket has been closed, send the app | |
1649 | * to the thread and unregistration will take place at that | |
1650 | * place. | |
1651 | */ | |
1652 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1653 | if (ret < 0) { |
d88aee68 DG |
1654 | rcu_read_unlock(); |
1655 | session_unlock_list(); | |
1656 | /* No apps. thread, stop the UST tracing. */ | |
1657 | goto error; | |
d0b96690 | 1658 | } |
d88aee68 | 1659 | |
d0b96690 DG |
1660 | rcu_read_unlock(); |
1661 | session_unlock_list(); | |
099e26bd | 1662 | } |
099e26bd DG |
1663 | } while (node != NULL); |
1664 | ||
12e2b881 | 1665 | health_poll_entry(); |
099e26bd DG |
1666 | /* Futex wait on queue. Blocking call on futex() */ |
1667 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1668 | health_poll_exit(); |
099e26bd | 1669 | } |
12e2b881 MD |
1670 | /* Normal exit, no error */ |
1671 | err = 0; | |
099e26bd DG |
1672 | |
1673 | error: | |
d88aee68 DG |
1674 | /* Clean up wait queue. */ |
1675 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1676 | &wait_queue.head, head) { |
d88aee68 | 1677 | cds_list_del(&wait_node->head); |
f45e313d | 1678 | wait_queue.count--; |
d88aee68 DG |
1679 | free(wait_node); |
1680 | } | |
1681 | ||
099e26bd | 1682 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1683 | if (err) { |
1684 | health_error(); | |
1685 | ERR("Health error occurred in %s", __func__); | |
1686 | } | |
1687 | health_unregister(); | |
099e26bd DG |
1688 | return NULL; |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * This thread manage application registration. | |
1693 | */ | |
1694 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1695 | { |
139ac872 | 1696 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1697 | uint32_t revents, nb_fd; |
1698 | struct lttng_poll_event events; | |
099e26bd DG |
1699 | /* |
1700 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1701 | * freed in the manage apps thread. | |
1702 | */ | |
1703 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1704 | |
099e26bd | 1705 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1706 | |
927ca06a DG |
1707 | health_register(HEALTH_TYPE_APP_REG); |
1708 | ||
6993eeb3 CB |
1709 | if (testpoint(thread_registration_apps)) { |
1710 | goto error_testpoint; | |
1711 | } | |
8ac94142 | 1712 | |
1d4b027a DG |
1713 | ret = lttcomm_listen_unix_sock(apps_sock); |
1714 | if (ret < 0) { | |
76d7553f | 1715 | goto error_listen; |
1d4b027a DG |
1716 | } |
1717 | ||
5eb91c98 DG |
1718 | /* |
1719 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1720 | * more will be added to this poll set. | |
1721 | */ | |
d0b96690 | 1722 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1723 | if (ret < 0) { |
76d7553f | 1724 | goto error_create_poll; |
5eb91c98 | 1725 | } |
273ea72c | 1726 | |
5eb91c98 DG |
1727 | /* Add the application registration socket */ |
1728 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1729 | if (ret < 0) { | |
76d7553f | 1730 | goto error_poll_add; |
5eb91c98 | 1731 | } |
273ea72c | 1732 | |
1d4b027a | 1733 | /* Notify all applications to register */ |
0fdd1e2c DG |
1734 | ret = notify_ust_apps(1); |
1735 | if (ret < 0) { | |
1736 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1737 | "Execution continues but there might be problem for already\n" |
1738 | "running applications that wishes to register."); | |
0fdd1e2c | 1739 | } |
1d4b027a DG |
1740 | |
1741 | while (1) { | |
1742 | DBG("Accepting application registration"); | |
273ea72c DG |
1743 | |
1744 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1745 | restart: |
a78af745 | 1746 | health_poll_entry(); |
5eb91c98 | 1747 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1748 | health_poll_exit(); |
273ea72c | 1749 | if (ret < 0) { |
88f2b785 MD |
1750 | /* |
1751 | * Restart interrupted system call. | |
1752 | */ | |
1753 | if (errno == EINTR) { | |
1754 | goto restart; | |
1755 | } | |
273ea72c DG |
1756 | goto error; |
1757 | } | |
1758 | ||
0d9c5d77 DG |
1759 | nb_fd = ret; |
1760 | ||
5eb91c98 | 1761 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1762 | health_code_update(); |
139ac872 | 1763 | |
5eb91c98 DG |
1764 | /* Fetch once the poll data */ |
1765 | revents = LTTNG_POLL_GETEV(&events, i); | |
1766 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1767 | |
5eb91c98 | 1768 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1769 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1770 | if (ret) { |
139ac872 MD |
1771 | err = 0; |
1772 | goto exit; | |
90014c57 | 1773 | } |
1d4b027a | 1774 | |
5eb91c98 DG |
1775 | /* Event on the registration socket */ |
1776 | if (pollfd == apps_sock) { | |
1777 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1778 | ERR("Register apps socket poll error"); | |
1779 | goto error; | |
1780 | } else if (revents & LPOLLIN) { | |
1781 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1782 | if (sock < 0) { | |
1783 | goto error; | |
1784 | } | |
099e26bd | 1785 | |
b662582b DG |
1786 | /* |
1787 | * Set the CLOEXEC flag. Return code is useless because | |
1788 | * either way, the show must go on. | |
1789 | */ | |
1790 | (void) utils_set_fd_cloexec(sock); | |
1791 | ||
5eb91c98 | 1792 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1793 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1794 | if (ust_cmd == NULL) { |
76d7553f | 1795 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1796 | goto error; |
1797 | } | |
1d4b027a | 1798 | |
5eb91c98 DG |
1799 | /* |
1800 | * Using message-based transmissions to ensure we don't | |
1801 | * have to deal with partially received messages. | |
1802 | */ | |
4063050c MD |
1803 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1804 | if (ret < 0) { | |
1805 | ERR("Exhausted file descriptors allowed for applications."); | |
1806 | free(ust_cmd); | |
1807 | ret = close(sock); | |
1808 | if (ret) { | |
1809 | PERROR("close"); | |
1810 | } | |
1811 | sock = -1; | |
1812 | continue; | |
1813 | } | |
d88aee68 | 1814 | |
840cb59c | 1815 | health_code_update(); |
d0b96690 DG |
1816 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1817 | if (ret < 0) { | |
5eb91c98 | 1818 | free(ust_cmd); |
d0b96690 | 1819 | /* Close socket of the application. */ |
76d7553f MD |
1820 | ret = close(sock); |
1821 | if (ret) { | |
1822 | PERROR("close"); | |
1823 | } | |
4063050c | 1824 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1825 | sock = -1; |
5eb91c98 DG |
1826 | continue; |
1827 | } | |
840cb59c | 1828 | health_code_update(); |
099e26bd | 1829 | |
5eb91c98 | 1830 | ust_cmd->sock = sock; |
34a2494f | 1831 | sock = -1; |
099e26bd | 1832 | |
5eb91c98 DG |
1833 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1834 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1835 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1836 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1837 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1838 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1839 | |
5eb91c98 DG |
1840 | /* |
1841 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1842 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1843 | */ |
1844 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1845 | ||
1846 | /* | |
1847 | * Wake the registration queue futex. Implicit memory | |
1848 | * barrier with the exchange in cds_wfq_enqueue. | |
1849 | */ | |
1850 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1851 | } | |
1852 | } | |
90014c57 | 1853 | } |
1d4b027a DG |
1854 | } |
1855 | ||
139ac872 | 1856 | exit: |
1d4b027a | 1857 | error: |
139ac872 | 1858 | if (err) { |
840cb59c | 1859 | health_error(); |
139ac872 MD |
1860 | ERR("Health error occurred in %s", __func__); |
1861 | } | |
139ac872 | 1862 | |
0fdd1e2c DG |
1863 | /* Notify that the registration thread is gone */ |
1864 | notify_ust_apps(0); | |
1865 | ||
a4b35e07 | 1866 | if (apps_sock >= 0) { |
76d7553f MD |
1867 | ret = close(apps_sock); |
1868 | if (ret) { | |
1869 | PERROR("close"); | |
1870 | } | |
a4b35e07 | 1871 | } |
46c3f085 | 1872 | if (sock >= 0) { |
76d7553f MD |
1873 | ret = close(sock); |
1874 | if (ret) { | |
1875 | PERROR("close"); | |
1876 | } | |
4063050c | 1877 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1878 | } |
273ea72c | 1879 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1880 | |
76d7553f | 1881 | error_poll_add: |
5eb91c98 | 1882 | lttng_poll_clean(&events); |
76d7553f MD |
1883 | error_listen: |
1884 | error_create_poll: | |
6993eeb3 | 1885 | error_testpoint: |
76d7553f | 1886 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1887 | health_unregister(); |
5eb91c98 | 1888 | |
1d4b027a DG |
1889 | return NULL; |
1890 | } | |
1891 | ||
8c0faa1d | 1892 | /* |
3bd1e081 | 1893 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1894 | * exec or it will fails. |
8c0faa1d | 1895 | */ |
3bd1e081 | 1896 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1897 | { |
a23ec3a7 | 1898 | int ret, clock_ret; |
ee0b0061 DG |
1899 | struct timespec timeout; |
1900 | ||
a23ec3a7 DG |
1901 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1902 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1903 | |
a23ec3a7 DG |
1904 | /* Setup pthread condition */ |
1905 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1906 | if (ret != 0) { | |
1907 | errno = ret; | |
1908 | PERROR("pthread_condattr_init consumer data"); | |
1909 | goto error; | |
1910 | } | |
1911 | ||
1912 | /* | |
1913 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1914 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1915 | * for a more details and how we noticed it. | |
1916 | */ | |
1917 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1918 | if (ret != 0) { | |
1919 | errno = ret; | |
1920 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1921 | goto error; |
1922 | } | |
8c0faa1d | 1923 | |
a23ec3a7 DG |
1924 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1925 | if (ret != 0) { | |
1926 | errno = ret; | |
1927 | PERROR("pthread_cond_init consumer data"); | |
1928 | goto error; | |
1929 | } | |
1930 | ||
1931 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1932 | consumer_data); | |
8c0faa1d | 1933 | if (ret != 0) { |
3bd1e081 | 1934 | PERROR("pthread_create consumer"); |
ee0b0061 | 1935 | ret = -1; |
8c0faa1d DG |
1936 | goto error; |
1937 | } | |
1938 | ||
a23ec3a7 DG |
1939 | /* We are about to wait on a pthread condition */ |
1940 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1941 | ||
ee0b0061 | 1942 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1943 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1944 | /* | |
1945 | * Set the timeout for the condition timed wait even if the clock gettime | |
1946 | * call fails since we might loop on that call and we want to avoid to | |
1947 | * increment the timeout too many times. | |
1948 | */ | |
1949 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1950 | ||
1951 | /* | |
1952 | * The following loop COULD be skipped in some conditions so this is why we | |
1953 | * set ret to 0 in order to make sure at least one round of the loop is | |
1954 | * done. | |
1955 | */ | |
1956 | ret = 0; | |
1957 | ||
1958 | /* | |
1959 | * Loop until the condition is reached or when a timeout is reached. Note | |
1960 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1961 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1962 | * possible. This loop does not take any chances and works with both of | |
1963 | * them. | |
1964 | */ | |
1965 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1966 | if (clock_ret < 0) { | |
1967 | PERROR("clock_gettime spawn consumer"); | |
1968 | /* Infinite wait for the consumerd thread to be ready */ | |
1969 | ret = pthread_cond_wait(&consumer_data->cond, | |
1970 | &consumer_data->cond_mutex); | |
1971 | } else { | |
1972 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1973 | &consumer_data->cond_mutex, &timeout); | |
1974 | } | |
ee0b0061 | 1975 | } |
8c0faa1d | 1976 | |
a23ec3a7 DG |
1977 | /* Release the pthread condition */ |
1978 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1979 | ||
1980 | if (ret != 0) { | |
1981 | errno = ret; | |
1982 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1983 | /* |
1984 | * Call has timed out so we kill the kconsumerd_thread and return | |
1985 | * an error. | |
1986 | */ | |
a23ec3a7 DG |
1987 | ERR("Condition timed out. The consumer thread was never ready." |
1988 | " Killing it"); | |
3bd1e081 | 1989 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1990 | if (ret < 0) { |
3bd1e081 | 1991 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1992 | } |
1993 | } else { | |
a23ec3a7 | 1994 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1995 | } |
1996 | goto error; | |
1997 | } | |
1998 | ||
3bd1e081 MD |
1999 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2000 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2001 | ERR("Consumerd did not start"); |
3bd1e081 | 2002 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2003 | goto error; |
2004 | } | |
3bd1e081 | 2005 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2006 | |
8c0faa1d DG |
2007 | return 0; |
2008 | ||
2009 | error: | |
2010 | return ret; | |
2011 | } | |
2012 | ||
d9800920 | 2013 | /* |
3bd1e081 | 2014 | * Join consumer thread |
d9800920 | 2015 | */ |
3bd1e081 | 2016 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2017 | { |
2018 | void *status; | |
cf3af59e | 2019 | |
e8209f6b DG |
2020 | /* Consumer pid must be a real one. */ |
2021 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2022 | int ret; |
3bd1e081 | 2023 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2024 | if (ret) { |
3bd1e081 | 2025 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
2026 | return ret; |
2027 | } | |
3bd1e081 | 2028 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2029 | } else { |
2030 | return 0; | |
2031 | } | |
2032 | } | |
2033 | ||
8c0faa1d | 2034 | /* |
3bd1e081 | 2035 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2036 | * |
d063d709 | 2037 | * Return pid if successful else -1. |
8c0faa1d | 2038 | */ |
3bd1e081 | 2039 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2040 | { |
2041 | int ret; | |
2042 | pid_t pid; | |
94c55f17 | 2043 | const char *consumer_to_use; |
53086306 | 2044 | const char *verbosity; |
94c55f17 | 2045 | struct stat st; |
8c0faa1d | 2046 | |
3bd1e081 | 2047 | DBG("Spawning consumerd"); |
c49dc785 | 2048 | |
8c0faa1d DG |
2049 | pid = fork(); |
2050 | if (pid == 0) { | |
2051 | /* | |
3bd1e081 | 2052 | * Exec consumerd. |
8c0faa1d | 2053 | */ |
daee5345 | 2054 | if (opt_verbose_consumer) { |
53086306 DG |
2055 | verbosity = "--verbose"; |
2056 | } else { | |
2057 | verbosity = "--quiet"; | |
2058 | } | |
3bd1e081 MD |
2059 | switch (consumer_data->type) { |
2060 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2061 | /* |
c7704d57 DG |
2062 | * Find out which consumerd to execute. We will first try the |
2063 | * 64-bit path, then the sessiond's installation directory, and | |
2064 | * fallback on the 32-bit one, | |
94c55f17 | 2065 | */ |
63a799e8 AM |
2066 | DBG3("Looking for a kernel consumer at these locations:"); |
2067 | DBG3(" 1) %s", consumerd64_bin); | |
2068 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2069 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2070 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2071 | DBG3("Found location #1"); |
94c55f17 | 2072 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2073 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2074 | DBG3("Found location #2"); |
94c55f17 | 2075 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2076 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2077 | DBG3("Found location #3"); |
eb1e0bd4 | 2078 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2079 | } else { |
63a799e8 | 2080 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
2081 | break; |
2082 | } | |
2083 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
2084 | execl(consumer_to_use, | |
2085 | "lttng-consumerd", verbosity, "-k", | |
2086 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2087 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2088 | NULL); | |
3bd1e081 | 2089 | break; |
7753dea8 MD |
2090 | case LTTNG_CONSUMER64_UST: |
2091 | { | |
b1e0b6b6 | 2092 | char *tmpnew = NULL; |
8f4905da MD |
2093 | |
2094 | if (consumerd64_libdir[0] != '\0') { | |
2095 | char *tmp; | |
2096 | size_t tmplen; | |
2097 | ||
2098 | tmp = getenv("LD_LIBRARY_PATH"); | |
2099 | if (!tmp) { | |
2100 | tmp = ""; | |
2101 | } | |
2102 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2103 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2104 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2105 | if (!tmpnew) { | |
2106 | ret = -ENOMEM; | |
2107 | goto error; | |
2108 | } | |
2109 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2110 | strcat(tmpnew, consumerd64_libdir); | |
2111 | if (tmp[0] != '\0') { | |
2112 | strcat(tmpnew, ":"); | |
2113 | strcat(tmpnew, tmp); | |
2114 | } | |
2115 | ret = putenv(tmpnew); | |
2116 | if (ret) { | |
2117 | ret = -errno; | |
c6f76da9 | 2118 | free(tmpnew); |
8f4905da MD |
2119 | goto error; |
2120 | } | |
2121 | } | |
94c55f17 | 2122 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2123 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2124 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2125 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2126 | NULL); | |
8f4905da MD |
2127 | if (consumerd64_libdir[0] != '\0') { |
2128 | free(tmpnew); | |
2129 | } | |
2130 | if (ret) { | |
2131 | goto error; | |
2132 | } | |
3bd1e081 | 2133 | break; |
7753dea8 MD |
2134 | } |
2135 | case LTTNG_CONSUMER32_UST: | |
2136 | { | |
937dde8e | 2137 | char *tmpnew = NULL; |
8f4905da MD |
2138 | |
2139 | if (consumerd32_libdir[0] != '\0') { | |
2140 | char *tmp; | |
2141 | size_t tmplen; | |
2142 | ||
2143 | tmp = getenv("LD_LIBRARY_PATH"); | |
2144 | if (!tmp) { | |
2145 | tmp = ""; | |
2146 | } | |
2147 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2148 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2149 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2150 | if (!tmpnew) { | |
2151 | ret = -ENOMEM; | |
2152 | goto error; | |
2153 | } | |
2154 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2155 | strcat(tmpnew, consumerd32_libdir); | |
2156 | if (tmp[0] != '\0') { | |
2157 | strcat(tmpnew, ":"); | |
2158 | strcat(tmpnew, tmp); | |
2159 | } | |
2160 | ret = putenv(tmpnew); | |
2161 | if (ret) { | |
2162 | ret = -errno; | |
c6f76da9 | 2163 | free(tmpnew); |
8f4905da MD |
2164 | goto error; |
2165 | } | |
2166 | } | |
94c55f17 | 2167 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2168 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2169 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2170 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2171 | NULL); | |
8f4905da MD |
2172 | if (consumerd32_libdir[0] != '\0') { |
2173 | free(tmpnew); | |
2174 | } | |
2175 | if (ret) { | |
2176 | goto error; | |
2177 | } | |
7753dea8 MD |
2178 | break; |
2179 | } | |
3bd1e081 | 2180 | default: |
76d7553f | 2181 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2182 | exit(EXIT_FAILURE); |
2183 | } | |
8c0faa1d | 2184 | if (errno != 0) { |
76d7553f | 2185 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
2186 | } |
2187 | exit(EXIT_FAILURE); | |
2188 | } else if (pid > 0) { | |
2189 | ret = pid; | |
8c0faa1d | 2190 | } else { |
76d7553f | 2191 | PERROR("start consumer fork"); |
8c0faa1d | 2192 | ret = -errno; |
8c0faa1d | 2193 | } |
8f4905da | 2194 | error: |
8c0faa1d DG |
2195 | return ret; |
2196 | } | |
2197 | ||
693bd40b | 2198 | /* |
3bd1e081 | 2199 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2200 | */ |
3bd1e081 | 2201 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2202 | { |
c617c0c6 | 2203 | int ret; |
edb8b045 DG |
2204 | |
2205 | /* | |
2206 | * Set the listen() state on the socket since there is a possible race | |
2207 | * between the exec() of the consumer daemon and this call if place in the | |
2208 | * consumer thread. See bug #366 for more details. | |
2209 | */ | |
2210 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2211 | if (ret < 0) { | |
2212 | goto error; | |
2213 | } | |
693bd40b | 2214 | |
3bd1e081 MD |
2215 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2216 | if (consumer_data->pid != 0) { | |
2217 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2218 | goto end; |
2219 | } | |
693bd40b | 2220 | |
3bd1e081 | 2221 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2222 | if (ret < 0) { |
3bd1e081 MD |
2223 | ERR("Spawning consumerd failed"); |
2224 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2225 | goto error; |
693bd40b | 2226 | } |
c49dc785 | 2227 | |
3bd1e081 MD |
2228 | /* Setting up the consumer_data pid */ |
2229 | consumer_data->pid = ret; | |
48842b30 | 2230 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2231 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2232 | |
3bd1e081 MD |
2233 | DBG2("Spawning consumer control thread"); |
2234 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2235 | if (ret < 0) { |
3bd1e081 | 2236 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2237 | goto error; |
2238 | } | |
2239 | ||
c49dc785 | 2240 | end: |
693bd40b DG |
2241 | return 0; |
2242 | ||
2243 | error: | |
331744e3 | 2244 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2245 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2246 | int err; |
2247 | ||
edb8b045 DG |
2248 | err = close(consumer_data->err_sock); |
2249 | if (err < 0) { | |
2250 | PERROR("close consumer data error socket"); | |
2251 | } | |
2252 | } | |
693bd40b DG |
2253 | return ret; |
2254 | } | |
2255 | ||
44a5e5eb | 2256 | /* |
139ac872 MD |
2257 | * Compute health status of each consumer. If one of them is zero (bad |
2258 | * state), we return 0. | |
44a5e5eb DG |
2259 | */ |
2260 | static int check_consumer_health(void) | |
2261 | { | |
2262 | int ret; | |
2263 | ||
927ca06a | 2264 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
2265 | |
2266 | DBG3("Health consumer check %d", ret); | |
2267 | ||
2268 | return ret; | |
2269 | } | |
2270 | ||
b73401da | 2271 | /* |
096102bd | 2272 | * Setup necessary data for kernel tracer action. |
b73401da | 2273 | */ |
096102bd | 2274 | static int init_kernel_tracer(void) |
b73401da DG |
2275 | { |
2276 | int ret; | |
b73401da | 2277 | |
096102bd DG |
2278 | /* Modprobe lttng kernel modules */ |
2279 | ret = modprobe_lttng_control(); | |
b73401da | 2280 | if (ret < 0) { |
b73401da DG |
2281 | goto error; |
2282 | } | |
2283 | ||
096102bd DG |
2284 | /* Open debugfs lttng */ |
2285 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2286 | if (kernel_tracer_fd < 0) { | |
2287 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2288 | ret = -1; |
2289 | goto error_open; | |
54d01ffb DG |
2290 | } |
2291 | ||
2f77fc4b DG |
2292 | /* Validate kernel version */ |
2293 | ret = kernel_validate_version(kernel_tracer_fd); | |
2294 | if (ret < 0) { | |
2295 | goto error_version; | |
b551a063 | 2296 | } |
54d01ffb | 2297 | |
2f77fc4b DG |
2298 | ret = modprobe_lttng_data(); |
2299 | if (ret < 0) { | |
2300 | goto error_modules; | |
54d01ffb DG |
2301 | } |
2302 | ||
2f77fc4b DG |
2303 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2304 | return 0; | |
2305 | ||
2306 | error_version: | |
2307 | modprobe_remove_lttng_control(); | |
2308 | ret = close(kernel_tracer_fd); | |
2309 | if (ret) { | |
2310 | PERROR("close"); | |
b551a063 | 2311 | } |
2f77fc4b | 2312 | kernel_tracer_fd = -1; |
f73fabfd | 2313 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2314 | |
2f77fc4b DG |
2315 | error_modules: |
2316 | ret = close(kernel_tracer_fd); | |
2317 | if (ret) { | |
2318 | PERROR("close"); | |
b551a063 | 2319 | } |
54d01ffb | 2320 | |
2f77fc4b DG |
2321 | error_open: |
2322 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2323 | |
2324 | error: | |
2f77fc4b DG |
2325 | WARN("No kernel tracer available"); |
2326 | kernel_tracer_fd = -1; | |
2327 | if (!is_root) { | |
f73fabfd | 2328 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2329 | } else { |
f73fabfd | 2330 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2331 | } |
54d01ffb DG |
2332 | } |
2333 | ||
2f77fc4b | 2334 | |
54d01ffb | 2335 | /* |
2f77fc4b DG |
2336 | * Copy consumer output from the tracing session to the domain session. The |
2337 | * function also applies the right modification on a per domain basis for the | |
2338 | * trace files destination directory. | |
36b588ed MD |
2339 | * |
2340 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2341 | */ |
2f77fc4b | 2342 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2343 | { |
2344 | int ret; | |
2f77fc4b DG |
2345 | const char *dir_name; |
2346 | struct consumer_output *consumer; | |
2347 | ||
2348 | assert(session); | |
2349 | assert(session->consumer); | |
54d01ffb | 2350 | |
b551a063 DG |
2351 | switch (domain) { |
2352 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2353 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2354 | /* |
2355 | * XXX: We should audit the session creation and what this function | |
2356 | * does "extra" in order to avoid a destroy since this function is used | |
2357 | * in the domain session creation (kernel and ust) only. Same for UST | |
2358 | * domain. | |
2359 | */ | |
2360 | if (session->kernel_session->consumer) { | |
2361 | consumer_destroy_output(session->kernel_session->consumer); | |
2362 | } | |
2f77fc4b DG |
2363 | session->kernel_session->consumer = |
2364 | consumer_copy_output(session->consumer); | |
2365 | /* Ease our life a bit for the next part */ | |
2366 | consumer = session->kernel_session->consumer; | |
2367 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2368 | break; |
2369 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2370 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2371 | if (session->ust_session->consumer) { |
2372 | consumer_destroy_output(session->ust_session->consumer); | |
2373 | } | |
2f77fc4b DG |
2374 | session->ust_session->consumer = |
2375 | consumer_copy_output(session->consumer); | |
2376 | /* Ease our life a bit for the next part */ | |
2377 | consumer = session->ust_session->consumer; | |
2378 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2379 | break; |
2380 | default: | |
f73fabfd | 2381 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2382 | goto error; |
2383 | } | |
2384 | ||
2f77fc4b | 2385 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2386 | strncat(consumer->subdir, dir_name, |
2387 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2388 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2389 | ||
f73fabfd | 2390 | ret = LTTNG_OK; |
54d01ffb DG |
2391 | |
2392 | error: | |
2393 | return ret; | |
2394 | } | |
2395 | ||
00e2e675 | 2396 | /* |
2f77fc4b | 2397 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2398 | * |
2399 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2400 | */ |
2f77fc4b DG |
2401 | static int create_ust_session(struct ltt_session *session, |
2402 | struct lttng_domain *domain) | |
00e2e675 DG |
2403 | { |
2404 | int ret; | |
2f77fc4b | 2405 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2406 | |
a4b92340 | 2407 | assert(session); |
2f77fc4b DG |
2408 | assert(domain); |
2409 | assert(session->consumer); | |
a4b92340 | 2410 | |
2f77fc4b DG |
2411 | switch (domain->type) { |
2412 | case LTTNG_DOMAIN_UST: | |
2413 | break; | |
2414 | default: | |
2415 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2416 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2417 | goto error; |
2418 | } | |
2419 | ||
2f77fc4b DG |
2420 | DBG("Creating UST session"); |
2421 | ||
dec56f6c | 2422 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2423 | if (lus == NULL) { |
f73fabfd | 2424 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2425 | goto error; |
2426 | } | |
2427 | ||
2f77fc4b DG |
2428 | lus->uid = session->uid; |
2429 | lus->gid = session->gid; | |
2bba9e53 | 2430 | lus->output_traces = session->output_traces; |
27babd3a | 2431 | lus->snapshot_mode = session->snapshot_mode; |
2f77fc4b | 2432 | session->ust_session = lus; |
00e2e675 | 2433 | |
2f77fc4b DG |
2434 | /* Copy session output to the newly created UST session */ |
2435 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2436 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2437 | goto error; |
2438 | } | |
2439 | ||
f73fabfd | 2440 | return LTTNG_OK; |
00e2e675 DG |
2441 | |
2442 | error: | |
2f77fc4b DG |
2443 | free(lus); |
2444 | session->ust_session = NULL; | |
00e2e675 DG |
2445 | return ret; |
2446 | } | |
2447 | ||
2448 | /* | |
2f77fc4b | 2449 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2450 | */ |
2f77fc4b | 2451 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2452 | { |
2453 | int ret; | |
a4b92340 | 2454 | |
2f77fc4b | 2455 | DBG("Creating kernel session"); |
00e2e675 | 2456 | |
2f77fc4b DG |
2457 | ret = kernel_create_session(session, kernel_tracer_fd); |
2458 | if (ret < 0) { | |
f73fabfd | 2459 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2460 | goto error; |
2461 | } | |
2462 | ||
2f77fc4b DG |
2463 | /* Code flow safety */ |
2464 | assert(session->kernel_session); | |
2465 | ||
2466 | /* Copy session output to the newly created Kernel session */ | |
2467 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2468 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2469 | goto error; |
2470 | } | |
2471 | ||
2f77fc4b DG |
2472 | /* Create directory(ies) on local filesystem. */ |
2473 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2474 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2475 | ret = run_as_mkdir_recursive( | |
2476 | session->kernel_session->consumer->dst.trace_path, | |
2477 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2478 | if (ret < 0) { | |
2479 | if (ret != -EEXIST) { | |
2480 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2481 | goto error; |
2482 | } | |
00e2e675 | 2483 | } |
2f77fc4b | 2484 | } |
00e2e675 | 2485 | |
2f77fc4b DG |
2486 | session->kernel_session->uid = session->uid; |
2487 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2488 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2489 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2490 | |
f73fabfd | 2491 | return LTTNG_OK; |
00e2e675 | 2492 | |
2f77fc4b DG |
2493 | error: |
2494 | trace_kernel_destroy_session(session->kernel_session); | |
2495 | session->kernel_session = NULL; | |
2496 | return ret; | |
2497 | } | |
00e2e675 | 2498 | |
2f77fc4b DG |
2499 | /* |
2500 | * Count number of session permitted by uid/gid. | |
2501 | */ | |
2502 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2503 | { | |
2504 | unsigned int i = 0; | |
2505 | struct ltt_session *session; | |
07424f16 | 2506 | |
2f77fc4b DG |
2507 | DBG("Counting number of available session for UID %d GID %d", |
2508 | uid, gid); | |
2509 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2510 | /* |
2f77fc4b | 2511 | * Only list the sessions the user can control. |
00e2e675 | 2512 | */ |
2f77fc4b DG |
2513 | if (!session_access_ok(session, uid, gid)) { |
2514 | continue; | |
2515 | } | |
2516 | i++; | |
a4b92340 | 2517 | } |
2f77fc4b | 2518 | return i; |
00e2e675 DG |
2519 | } |
2520 | ||
54d01ffb DG |
2521 | /* |
2522 | * Process the command requested by the lttng client within the command | |
2523 | * context structure. This function make sure that the return structure (llm) | |
2524 | * is set and ready for transmission before returning. | |
2525 | * | |
2526 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2527 | * |
2528 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2529 | * |
2530 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2531 | */ |
53a80697 MD |
2532 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2533 | int *sock_error) | |
54d01ffb | 2534 | { |
f73fabfd | 2535 | int ret = LTTNG_OK; |
44d3bd01 | 2536 | int need_tracing_session = 1; |
2e09ba09 | 2537 | int need_domain; |
54d01ffb DG |
2538 | |
2539 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2540 | ||
53a80697 MD |
2541 | *sock_error = 0; |
2542 | ||
2e09ba09 MD |
2543 | switch (cmd_ctx->lsm->cmd_type) { |
2544 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2545 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
2e09ba09 MD |
2546 | case LTTNG_DESTROY_SESSION: |
2547 | case LTTNG_LIST_SESSIONS: | |
2548 | case LTTNG_LIST_DOMAINS: | |
2549 | case LTTNG_START_TRACE: | |
2550 | case LTTNG_STOP_TRACE: | |
6d805429 | 2551 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2552 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2553 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2554 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2555 | case LTTNG_SNAPSHOT_RECORD: | |
2e09ba09 | 2556 | need_domain = 0; |
3aace903 | 2557 | break; |
2e09ba09 MD |
2558 | default: |
2559 | need_domain = 1; | |
2560 | } | |
2561 | ||
2562 | if (opt_no_kernel && need_domain | |
2563 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2564 | if (!is_root) { |
f73fabfd | 2565 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2566 | } else { |
f73fabfd | 2567 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2568 | } |
4fba7219 DG |
2569 | goto error; |
2570 | } | |
2571 | ||
8d3113b2 DG |
2572 | /* Deny register consumer if we already have a spawned consumer. */ |
2573 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2574 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2575 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2576 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2577 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2578 | goto error; |
2579 | } | |
2580 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2581 | } | |
2582 | ||
54d01ffb DG |
2583 | /* |
2584 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2585 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2586 | * command. |
2587 | */ | |
2588 | switch(cmd_ctx->lsm->cmd_type) { | |
2589 | case LTTNG_LIST_SESSIONS: | |
2590 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2591 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2592 | case LTTNG_LIST_DOMAINS: |
2593 | case LTTNG_LIST_CHANNELS: | |
2594 | case LTTNG_LIST_EVENTS: | |
2595 | break; | |
2596 | default: | |
2597 | /* Setup lttng message with no payload */ | |
2598 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2599 | if (ret < 0) { | |
2600 | /* This label does not try to unlock the session */ | |
2601 | goto init_setup_error; | |
2602 | } | |
2603 | } | |
2604 | ||
2605 | /* Commands that DO NOT need a session. */ | |
2606 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2607 | case LTTNG_CREATE_SESSION: |
27babd3a | 2608 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
2e09ba09 | 2609 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2610 | case LTTNG_LIST_SESSIONS: |
2611 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2612 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2613 | need_tracing_session = 0; |
54d01ffb DG |
2614 | break; |
2615 | default: | |
2616 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2617 | /* |
2618 | * We keep the session list lock across _all_ commands | |
2619 | * for now, because the per-session lock does not | |
2620 | * handle teardown properly. | |
2621 | */ | |
74babd95 | 2622 | session_lock_list(); |
54d01ffb DG |
2623 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2624 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2625 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2626 | goto error; |
2627 | } else { | |
2628 | /* Acquire lock for the session */ | |
2629 | session_lock(cmd_ctx->session); | |
2630 | } | |
2631 | break; | |
2632 | } | |
b389abbe | 2633 | |
2e09ba09 MD |
2634 | if (!need_domain) { |
2635 | goto skip_domain; | |
2636 | } | |
a4b92340 | 2637 | |
54d01ffb DG |
2638 | /* |
2639 | * Check domain type for specific "pre-action". | |
2640 | */ | |
2641 | switch (cmd_ctx->lsm->domain.type) { | |
2642 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2643 | if (!is_root) { |
f73fabfd | 2644 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2645 | goto error; |
2646 | } | |
2647 | ||
54d01ffb | 2648 | /* Kernel tracer check */ |
a4b35e07 | 2649 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2650 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2651 | ret = init_kernel_tracer(); |
2652 | if (ret != 0) { | |
54d01ffb DG |
2653 | goto error; |
2654 | } | |
2655 | } | |
5eb91c98 | 2656 | |
5c827ce0 DG |
2657 | /* Consumer is in an ERROR state. Report back to client */ |
2658 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2659 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2660 | goto error; |
2661 | } | |
2662 | ||
54d01ffb | 2663 | /* Need a session for kernel command */ |
44d3bd01 | 2664 | if (need_tracing_session) { |
54d01ffb | 2665 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2666 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2667 | if (ret < 0) { |
f73fabfd | 2668 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2669 | goto error; |
2670 | } | |
b389abbe | 2671 | } |
7d29a247 | 2672 | |
54d01ffb | 2673 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2674 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2675 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2676 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2677 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2678 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2679 | if (ret < 0) { |
f73fabfd | 2680 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2681 | goto error; |
950131af | 2682 | } |
5c827ce0 | 2683 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2684 | } else { |
2685 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2686 | } |
173af62f | 2687 | |
a4b92340 DG |
2688 | /* |
2689 | * The consumer was just spawned so we need to add the socket to | |
2690 | * the consumer output of the session if exist. | |
2691 | */ | |
2692 | ret = consumer_create_socket(&kconsumer_data, | |
2693 | cmd_ctx->session->kernel_session->consumer); | |
2694 | if (ret < 0) { | |
2695 | goto error; | |
173af62f | 2696 | } |
0d0c377a | 2697 | } |
5c827ce0 | 2698 | |
54d01ffb | 2699 | break; |
2bdd86d4 | 2700 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2701 | { |
5c827ce0 DG |
2702 | /* Consumer is in an ERROR state. Report back to client */ |
2703 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2704 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2705 | goto error; |
2706 | } | |
2707 | ||
44d3bd01 | 2708 | if (need_tracing_session) { |
a4b92340 | 2709 | /* Create UST session if none exist. */ |
f6a9efaa | 2710 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2711 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2712 | &cmd_ctx->lsm->domain); |
f73fabfd | 2713 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2714 | goto error; |
2715 | } | |
2716 | } | |
00e2e675 | 2717 | |
7753dea8 MD |
2718 | /* Start the UST consumer daemons */ |
2719 | /* 64-bit */ | |
2720 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2721 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2722 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2723 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2724 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2725 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2726 | if (ret < 0) { |
f73fabfd | 2727 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2728 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2729 | goto error; |
2730 | } | |
48842b30 | 2731 | |
173af62f | 2732 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2733 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2734 | } else { |
7753dea8 MD |
2735 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2736 | } | |
173af62f DG |
2737 | |
2738 | /* | |
2739 | * Setup socket for consumer 64 bit. No need for atomic access | |
2740 | * since it was set above and can ONLY be set in this thread. | |
2741 | */ | |
a4b92340 DG |
2742 | ret = consumer_create_socket(&ustconsumer64_data, |
2743 | cmd_ctx->session->ust_session->consumer); | |
2744 | if (ret < 0) { | |
2745 | goto error; | |
173af62f DG |
2746 | } |
2747 | ||
7753dea8 | 2748 | /* 32-bit */ |
fc7a59ce | 2749 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2750 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2751 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2752 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2753 | ret = start_consumerd(&ustconsumer32_data); | |
2754 | if (ret < 0) { | |
f73fabfd | 2755 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2756 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2757 | goto error; |
2758 | } | |
5c827ce0 | 2759 | |
173af62f | 2760 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2761 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2762 | } else { |
2763 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2764 | } |
173af62f DG |
2765 | |
2766 | /* | |
2767 | * Setup socket for consumer 64 bit. No need for atomic access | |
2768 | * since it was set above and can ONLY be set in this thread. | |
2769 | */ | |
a4b92340 DG |
2770 | ret = consumer_create_socket(&ustconsumer32_data, |
2771 | cmd_ctx->session->ust_session->consumer); | |
2772 | if (ret < 0) { | |
2773 | goto error; | |
173af62f | 2774 | } |
44d3bd01 DG |
2775 | } |
2776 | break; | |
48842b30 | 2777 | } |
54d01ffb | 2778 | default: |
54d01ffb DG |
2779 | break; |
2780 | } | |
2e09ba09 | 2781 | skip_domain: |
33a2b854 | 2782 | |
5c827ce0 DG |
2783 | /* Validate consumer daemon state when start/stop trace command */ |
2784 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2785 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2786 | switch (cmd_ctx->lsm->domain.type) { | |
2787 | case LTTNG_DOMAIN_UST: | |
2788 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2789 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2790 | goto error; |
2791 | } | |
2792 | break; | |
2793 | case LTTNG_DOMAIN_KERNEL: | |
2794 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2795 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2796 | goto error; |
2797 | } | |
2798 | break; | |
2799 | } | |
2800 | } | |
2801 | ||
8e0af1b4 MD |
2802 | /* |
2803 | * Check that the UID or GID match that of the tracing session. | |
2804 | * The root user can interact with all sessions. | |
2805 | */ | |
2806 | if (need_tracing_session) { | |
2807 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2808 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2809 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2810 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2811 | goto error; |
2812 | } | |
2813 | } | |
2814 | ||
ffe60014 DG |
2815 | /* |
2816 | * Send relayd information to consumer as soon as we have a domain and a | |
2817 | * session defined. | |
2818 | */ | |
2819 | if (cmd_ctx->session && need_domain) { | |
2820 | /* | |
2821 | * Setup relayd if not done yet. If the relayd information was already | |
2822 | * sent to the consumer, this call will gracefully return. | |
2823 | */ | |
2824 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2825 | if (ret != LTTNG_OK) { | |
2826 | goto error; | |
2827 | } | |
2828 | } | |
2829 | ||
54d01ffb DG |
2830 | /* Process by command type */ |
2831 | switch (cmd_ctx->lsm->cmd_type) { | |
2832 | case LTTNG_ADD_CONTEXT: | |
2833 | { | |
2834 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2835 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2836 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2837 | break; |
2838 | } | |
2839 | case LTTNG_DISABLE_CHANNEL: | |
2840 | { | |
2841 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2842 | cmd_ctx->lsm->u.disable.channel_name); | |
2843 | break; | |
2844 | } | |
2845 | case LTTNG_DISABLE_EVENT: | |
2846 | { | |
2847 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2848 | cmd_ctx->lsm->u.disable.channel_name, | |
2849 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2850 | break; |
2851 | } | |
54d01ffb DG |
2852 | case LTTNG_DISABLE_ALL_EVENT: |
2853 | { | |
2bdd86d4 | 2854 | DBG("Disabling all events"); |
54d01ffb DG |
2855 | |
2856 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2857 | cmd_ctx->lsm->u.disable.channel_name); | |
2858 | break; | |
2859 | } | |
2860 | case LTTNG_ENABLE_CHANNEL: | |
2861 | { | |
7972aab2 | 2862 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 2863 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2864 | break; |
2865 | } | |
2866 | case LTTNG_ENABLE_EVENT: | |
2867 | { | |
7972aab2 | 2868 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb | 2869 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2870 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2871 | break; |
2872 | } | |
2873 | case LTTNG_ENABLE_ALL_EVENT: | |
2874 | { | |
2bdd86d4 | 2875 | DBG("Enabling all events"); |
54d01ffb | 2876 | |
7972aab2 | 2877 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 2878 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2879 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2880 | break; |
2881 | } | |
052da939 | 2882 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2883 | { |
9f19cc17 | 2884 | struct lttng_event *events; |
54d01ffb | 2885 | ssize_t nb_events; |
052da939 | 2886 | |
54d01ffb DG |
2887 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2888 | if (nb_events < 0) { | |
f73fabfd | 2889 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2890 | ret = -nb_events; |
2891 | goto error; | |
2ef84c95 DG |
2892 | } |
2893 | ||
2894 | /* | |
2895 | * Setup lttng message with payload size set to the event list size in | |
2896 | * bytes and then copy list into the llm payload. | |
2897 | */ | |
052da939 | 2898 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2899 | if (ret < 0) { |
052da939 | 2900 | free(events); |
2ef84c95 DG |
2901 | goto setup_error; |
2902 | } | |
2903 | ||
2904 | /* Copy event list into message payload */ | |
9f19cc17 | 2905 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2906 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2907 | |
9f19cc17 | 2908 | free(events); |
2ef84c95 | 2909 | |
f73fabfd | 2910 | ret = LTTNG_OK; |
2ef84c95 DG |
2911 | break; |
2912 | } | |
f37d259d MD |
2913 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2914 | { | |
2915 | struct lttng_event_field *fields; | |
2916 | ssize_t nb_fields; | |
2917 | ||
a4b92340 DG |
2918 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2919 | &fields); | |
f37d259d | 2920 | if (nb_fields < 0) { |
f73fabfd | 2921 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2922 | ret = -nb_fields; |
2923 | goto error; | |
2924 | } | |
2925 | ||
2926 | /* | |
2927 | * Setup lttng message with payload size set to the event list size in | |
2928 | * bytes and then copy list into the llm payload. | |
2929 | */ | |
a4b92340 DG |
2930 | ret = setup_lttng_msg(cmd_ctx, |
2931 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2932 | if (ret < 0) { |
2933 | free(fields); | |
2934 | goto setup_error; | |
2935 | } | |
2936 | ||
2937 | /* Copy event list into message payload */ | |
2938 | memcpy(cmd_ctx->llm->payload, fields, | |
2939 | sizeof(struct lttng_event_field) * nb_fields); | |
2940 | ||
2941 | free(fields); | |
2942 | ||
f73fabfd | 2943 | ret = LTTNG_OK; |
f37d259d MD |
2944 | break; |
2945 | } | |
00e2e675 DG |
2946 | case LTTNG_SET_CONSUMER_URI: |
2947 | { | |
a4b92340 DG |
2948 | size_t nb_uri, len; |
2949 | struct lttng_uri *uris; | |
2950 | ||
2951 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2952 | len = nb_uri * sizeof(struct lttng_uri); | |
2953 | ||
2954 | if (nb_uri == 0) { | |
f73fabfd | 2955 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2956 | goto error; |
2957 | } | |
2958 | ||
2959 | uris = zmalloc(len); | |
2960 | if (uris == NULL) { | |
f73fabfd | 2961 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2962 | goto error; |
2963 | } | |
2964 | ||
2965 | /* Receive variable len data */ | |
77c7c900 | 2966 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2967 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2968 | if (ret <= 0) { | |
2969 | DBG("No URIs received from client... continuing"); | |
2970 | *sock_error = 1; | |
f73fabfd | 2971 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2972 | free(uris); |
a4b92340 DG |
2973 | goto error; |
2974 | } | |
2975 | ||
00e2e675 | 2976 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2977 | nb_uri, uris); |
f73fabfd | 2978 | if (ret != LTTNG_OK) { |
b1d41407 | 2979 | free(uris); |
a4b92340 DG |
2980 | goto error; |
2981 | } | |
2982 | ||
2983 | /* | |
2984 | * XXX: 0 means that this URI should be applied on the session. Should | |
2985 | * be a DOMAIN enuam. | |
2986 | */ | |
2987 | if (cmd_ctx->lsm->domain.type == 0) { | |
2988 | /* Add the URI for the UST session if a consumer is present. */ | |
2989 | if (cmd_ctx->session->ust_session && | |
2990 | cmd_ctx->session->ust_session->consumer) { | |
2991 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2992 | nb_uri, uris); | |
2993 | } else if (cmd_ctx->session->kernel_session && | |
2994 | cmd_ctx->session->kernel_session->consumer) { | |
2995 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2996 | cmd_ctx->session, nb_uri, uris); | |
2997 | } | |
2998 | } | |
2999 | ||
b1d41407 DG |
3000 | free(uris); |
3001 | ||
00e2e675 DG |
3002 | break; |
3003 | } | |
f3ed775e | 3004 | case LTTNG_START_TRACE: |
8c0faa1d | 3005 | { |
54d01ffb | 3006 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3007 | break; |
3008 | } | |
f3ed775e | 3009 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3010 | { |
54d01ffb | 3011 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3012 | break; |
3013 | } | |
5e16da05 MD |
3014 | case LTTNG_CREATE_SESSION: |
3015 | { | |
a4b92340 DG |
3016 | size_t nb_uri, len; |
3017 | struct lttng_uri *uris = NULL; | |
3018 | ||
3019 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3020 | len = nb_uri * sizeof(struct lttng_uri); | |
3021 | ||
3022 | if (nb_uri > 0) { | |
3023 | uris = zmalloc(len); | |
3024 | if (uris == NULL) { | |
f73fabfd | 3025 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3026 | goto error; |
3027 | } | |
3028 | ||
3029 | /* Receive variable len data */ | |
77c7c900 | 3030 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3031 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3032 | if (ret <= 0) { | |
3033 | DBG("No URIs received from client... continuing"); | |
3034 | *sock_error = 1; | |
f73fabfd | 3035 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3036 | free(uris); |
a4b92340 DG |
3037 | goto error; |
3038 | } | |
3039 | ||
3040 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3041 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3042 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3043 | free(uris); |
a4b92340 DG |
3044 | goto error; |
3045 | } | |
3046 | } | |
3047 | ||
3048 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
3049 | &cmd_ctx->creds); | |
3050 | ||
b1d41407 DG |
3051 | free(uris); |
3052 | ||
00e2e675 DG |
3053 | break; |
3054 | } | |
5e16da05 MD |
3055 | case LTTNG_DESTROY_SESSION: |
3056 | { | |
2f77fc4b | 3057 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3058 | |
3059 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3060 | cmd_ctx->session = NULL; |
5461b305 | 3061 | break; |
5e16da05 | 3062 | } |
9f19cc17 | 3063 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3064 | { |
54d01ffb DG |
3065 | ssize_t nb_dom; |
3066 | struct lttng_domain *domains; | |
5461b305 | 3067 | |
54d01ffb DG |
3068 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3069 | if (nb_dom < 0) { | |
f73fabfd | 3070 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3071 | ret = -nb_dom; |
3072 | goto error; | |
ce3d728c | 3073 | } |
520ff687 | 3074 | |
54d01ffb | 3075 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3076 | if (ret < 0) { |
ae9c20bc | 3077 | free(domains); |
5461b305 | 3078 | goto setup_error; |
520ff687 | 3079 | } |
57167058 | 3080 | |
54d01ffb DG |
3081 | /* Copy event list into message payload */ |
3082 | memcpy(cmd_ctx->llm->payload, domains, | |
3083 | nb_dom * sizeof(struct lttng_domain)); | |
3084 | ||
3085 | free(domains); | |
5e16da05 | 3086 | |
f73fabfd | 3087 | ret = LTTNG_OK; |
5e16da05 MD |
3088 | break; |
3089 | } | |
9f19cc17 | 3090 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3091 | { |
6775595e | 3092 | int nb_chan; |
54d01ffb DG |
3093 | struct lttng_channel *channels; |
3094 | ||
b551a063 DG |
3095 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3096 | cmd_ctx->session, &channels); | |
54d01ffb | 3097 | if (nb_chan < 0) { |
f73fabfd | 3098 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3099 | ret = -nb_chan; |
3100 | goto error; | |
5461b305 | 3101 | } |
ca95a216 | 3102 | |
54d01ffb | 3103 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3104 | if (ret < 0) { |
ae9c20bc | 3105 | free(channels); |
5461b305 DG |
3106 | goto setup_error; |
3107 | } | |
9f19cc17 | 3108 | |
54d01ffb DG |
3109 | /* Copy event list into message payload */ |
3110 | memcpy(cmd_ctx->llm->payload, channels, | |
3111 | nb_chan * sizeof(struct lttng_channel)); | |
3112 | ||
3113 | free(channels); | |
9f19cc17 | 3114 | |
f73fabfd | 3115 | ret = LTTNG_OK; |
5461b305 | 3116 | break; |
5e16da05 | 3117 | } |
9f19cc17 | 3118 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3119 | { |
b551a063 | 3120 | ssize_t nb_event; |
684d34d2 | 3121 | struct lttng_event *events = NULL; |
9f19cc17 | 3122 | |
b551a063 | 3123 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3124 | cmd_ctx->lsm->u.list.channel_name, &events); |
3125 | if (nb_event < 0) { | |
f73fabfd | 3126 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3127 | ret = -nb_event; |
3128 | goto error; | |
5461b305 | 3129 | } |
ca95a216 | 3130 | |
54d01ffb | 3131 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3132 | if (ret < 0) { |
ae9c20bc | 3133 | free(events); |
5461b305 DG |
3134 | goto setup_error; |
3135 | } | |
9f19cc17 | 3136 | |
54d01ffb DG |
3137 | /* Copy event list into message payload */ |
3138 | memcpy(cmd_ctx->llm->payload, events, | |
3139 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3140 | |
54d01ffb | 3141 | free(events); |
9f19cc17 | 3142 | |
f73fabfd | 3143 | ret = LTTNG_OK; |
5461b305 | 3144 | break; |
5e16da05 MD |
3145 | } |
3146 | case LTTNG_LIST_SESSIONS: | |
3147 | { | |
8e0af1b4 | 3148 | unsigned int nr_sessions; |
5461b305 | 3149 | |
8e0af1b4 | 3150 | session_lock_list(); |
730389d9 DG |
3151 | nr_sessions = lttng_sessions_count( |
3152 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3153 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3154 | |
8e0af1b4 | 3155 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3156 | if (ret < 0) { |
54d01ffb | 3157 | session_unlock_list(); |
5461b305 | 3158 | goto setup_error; |
e065084a | 3159 | } |
5e16da05 | 3160 | |
6c9cc2ab | 3161 | /* Filled the session array */ |
2f77fc4b | 3162 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3163 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3164 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3165 | |
54d01ffb | 3166 | session_unlock_list(); |
5e16da05 | 3167 | |
f73fabfd | 3168 | ret = LTTNG_OK; |
5e16da05 MD |
3169 | break; |
3170 | } | |
d0254c7c MD |
3171 | case LTTNG_CALIBRATE: |
3172 | { | |
54d01ffb DG |
3173 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3174 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3175 | break; |
3176 | } | |
d9800920 DG |
3177 | case LTTNG_REGISTER_CONSUMER: |
3178 | { | |
2f77fc4b DG |
3179 | struct consumer_data *cdata; |
3180 | ||
3181 | switch (cmd_ctx->lsm->domain.type) { | |
3182 | case LTTNG_DOMAIN_KERNEL: | |
3183 | cdata = &kconsumer_data; | |
3184 | break; | |
3185 | default: | |
f73fabfd | 3186 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3187 | goto error; |
3188 | } | |
3189 | ||
54d01ffb | 3190 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3191 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3192 | break; |
3193 | } | |
025faf73 | 3194 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
3195 | { |
3196 | struct lttng_filter_bytecode *bytecode; | |
3197 | ||
025faf73 | 3198 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 3199 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3200 | goto error; |
3201 | } | |
52df2401 MD |
3202 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
3203 | ret = LTTNG_ERR_FILTER_INVAL; | |
3204 | goto error; | |
3205 | } | |
025faf73 | 3206 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 3207 | if (!bytecode) { |
f73fabfd | 3208 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
3209 | goto error; |
3210 | } | |
3211 | /* Receive var. len. data */ | |
3212 | DBG("Receiving var len data from client ..."); | |
3213 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 3214 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
3215 | if (ret <= 0) { |
3216 | DBG("Nothing recv() from client var len data... continuing"); | |
3217 | *sock_error = 1; | |
f73fabfd | 3218 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3219 | goto error; |
3220 | } | |
3221 | ||
3222 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 3223 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 3224 | free(bytecode); |
f73fabfd | 3225 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3226 | goto error; |
3227 | } | |
3228 | ||
7972aab2 | 3229 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
025faf73 DG |
3230 | cmd_ctx->lsm->u.enable.channel_name, |
3231 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
3232 | break; |
3233 | } | |
6d805429 | 3234 | case LTTNG_DATA_PENDING: |
806e2684 | 3235 | { |
6d805429 | 3236 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3237 | break; |
3238 | } | |
da3c9ec1 DG |
3239 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3240 | { | |
6dc3064a DG |
3241 | struct lttcomm_lttng_output_id reply; |
3242 | ||
3243 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3244 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3245 | if (ret != LTTNG_OK) { | |
3246 | goto error; | |
3247 | } | |
3248 | ||
3249 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3250 | if (ret < 0) { | |
3251 | goto setup_error; | |
3252 | } | |
3253 | ||
3254 | /* Copy output list into message payload */ | |
3255 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3256 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3257 | break; |
3258 | } | |
3259 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3260 | { | |
6dc3064a DG |
3261 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3262 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3263 | break; |
3264 | } | |
3265 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3266 | { | |
6dc3064a DG |
3267 | ssize_t nb_output; |
3268 | struct lttng_snapshot_output *outputs = NULL; | |
3269 | ||
3270 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3271 | if (nb_output < 0) { | |
3272 | ret = -nb_output; | |
3273 | goto error; | |
3274 | } | |
3275 | ||
3276 | ret = setup_lttng_msg(cmd_ctx, | |
3277 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3278 | if (ret < 0) { | |
3279 | free(outputs); | |
3280 | goto setup_error; | |
3281 | } | |
3282 | ||
3283 | if (outputs) { | |
3284 | /* Copy output list into message payload */ | |
3285 | memcpy(cmd_ctx->llm->payload, outputs, | |
3286 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3287 | free(outputs); | |
3288 | } | |
3289 | ||
3290 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3291 | break; |
3292 | } | |
3293 | case LTTNG_SNAPSHOT_RECORD: | |
3294 | { | |
6dc3064a DG |
3295 | ret = cmd_snapshot_record(cmd_ctx->session, |
3296 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3297 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3298 | break; |
3299 | } | |
27babd3a DG |
3300 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3301 | { | |
3302 | size_t nb_uri, len; | |
3303 | struct lttng_uri *uris = NULL; | |
3304 | ||
3305 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3306 | len = nb_uri * sizeof(struct lttng_uri); | |
3307 | ||
3308 | if (nb_uri > 0) { | |
3309 | uris = zmalloc(len); | |
3310 | if (uris == NULL) { | |
3311 | ret = LTTNG_ERR_FATAL; | |
3312 | goto error; | |
3313 | } | |
3314 | ||
3315 | /* Receive variable len data */ | |
3316 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3317 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3318 | if (ret <= 0) { | |
3319 | DBG("No URIs received from client... continuing"); | |
3320 | *sock_error = 1; | |
3321 | ret = LTTNG_ERR_SESSION_FAIL; | |
3322 | free(uris); | |
3323 | goto error; | |
3324 | } | |
3325 | ||
3326 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3327 | DBG("Creating session with ONE network URI is a bad call"); | |
3328 | ret = LTTNG_ERR_SESSION_FAIL; | |
3329 | free(uris); | |
3330 | goto error; | |
3331 | } | |
3332 | } | |
3333 | ||
3334 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3335 | nb_uri, &cmd_ctx->creds); | |
3336 | free(uris); | |
3337 | break; | |
3338 | } | |
5e16da05 | 3339 | default: |
f73fabfd | 3340 | ret = LTTNG_ERR_UND; |
5461b305 | 3341 | break; |
fac6795d DG |
3342 | } |
3343 | ||
5461b305 | 3344 | error: |
5461b305 DG |
3345 | if (cmd_ctx->llm == NULL) { |
3346 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3347 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3348 | goto setup_error; |
3349 | } | |
3350 | } | |
54d01ffb | 3351 | /* Set return code */ |
5461b305 | 3352 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3353 | setup_error: |
b5541356 | 3354 | if (cmd_ctx->session) { |
54d01ffb | 3355 | session_unlock(cmd_ctx->session); |
b5541356 | 3356 | } |
256a5576 MD |
3357 | if (need_tracing_session) { |
3358 | session_unlock_list(); | |
3359 | } | |
54d01ffb | 3360 | init_setup_error: |
8028d920 | 3361 | return ret; |
fac6795d DG |
3362 | } |
3363 | ||
44a5e5eb DG |
3364 | /* |
3365 | * Thread managing health check socket. | |
3366 | */ | |
3367 | static void *thread_manage_health(void *data) | |
3368 | { | |
eb4a2943 | 3369 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3370 | uint32_t revents, nb_fd; |
3371 | struct lttng_poll_event events; | |
3372 | struct lttcomm_health_msg msg; | |
3373 | struct lttcomm_health_data reply; | |
3374 | ||
3375 | DBG("[thread] Manage health check started"); | |
3376 | ||
3377 | rcu_register_thread(); | |
3378 | ||
6d737ce4 DG |
3379 | /* We might hit an error path before this is created. */ |
3380 | lttng_poll_init(&events); | |
3cc04881 | 3381 | |
44a5e5eb DG |
3382 | /* Create unix socket */ |
3383 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3384 | if (sock < 0) { | |
3385 | ERR("Unable to create health check Unix socket"); | |
3386 | ret = -1; | |
3387 | goto error; | |
3388 | } | |
3389 | ||
b662582b DG |
3390 | /* |
3391 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3392 | * show must go on. | |
3393 | */ | |
3394 | (void) utils_set_fd_cloexec(sock); | |
3395 | ||
44a5e5eb DG |
3396 | ret = lttcomm_listen_unix_sock(sock); |
3397 | if (ret < 0) { | |
3398 | goto error; | |
3399 | } | |
3400 | ||
3401 | /* | |
3402 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3403 | * more will be added to this poll set. | |
3404 | */ | |
d0b96690 | 3405 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3406 | if (ret < 0) { |
3407 | goto error; | |
3408 | } | |
3409 | ||
3410 | /* Add the application registration socket */ | |
3411 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3412 | if (ret < 0) { | |
3413 | goto error; | |
3414 | } | |
3415 | ||
3416 | while (1) { | |
3417 | DBG("Health check ready"); | |
3418 | ||
44a5e5eb DG |
3419 | /* Inifinite blocking call, waiting for transmission */ |
3420 | restart: | |
3421 | ret = lttng_poll_wait(&events, -1); | |
3422 | if (ret < 0) { | |
3423 | /* | |
3424 | * Restart interrupted system call. | |
3425 | */ | |
3426 | if (errno == EINTR) { | |
3427 | goto restart; | |
3428 | } | |
3429 | goto error; | |
3430 | } | |
3431 | ||
0d9c5d77 DG |
3432 | nb_fd = ret; |
3433 | ||
44a5e5eb DG |
3434 | for (i = 0; i < nb_fd; i++) { |
3435 | /* Fetch once the poll data */ | |
3436 | revents = LTTNG_POLL_GETEV(&events, i); | |
3437 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3438 | ||
3439 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3440 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3441 | if (ret) { |
139ac872 MD |
3442 | err = 0; |
3443 | goto exit; | |
44a5e5eb DG |
3444 | } |
3445 | ||
3446 | /* Event on the registration socket */ | |
3447 | if (pollfd == sock) { | |
3448 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3449 | ERR("Health socket poll error"); | |
3450 | goto error; | |
3451 | } | |
3452 | } | |
3453 | } | |
3454 | ||
3455 | new_sock = lttcomm_accept_unix_sock(sock); | |
3456 | if (new_sock < 0) { | |
3457 | goto error; | |
3458 | } | |
3459 | ||
b662582b DG |
3460 | /* |
3461 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3462 | * show must go on. | |
3463 | */ | |
3464 | (void) utils_set_fd_cloexec(new_sock); | |
3465 | ||
44a5e5eb DG |
3466 | DBG("Receiving data from client for health..."); |
3467 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3468 | if (ret <= 0) { | |
3469 | DBG("Nothing recv() from client... continuing"); | |
3470 | ret = close(new_sock); | |
3471 | if (ret) { | |
3472 | PERROR("close"); | |
3473 | } | |
3474 | new_sock = -1; | |
3475 | continue; | |
3476 | } | |
3477 | ||
3478 | rcu_thread_online(); | |
3479 | ||
3480 | switch (msg.component) { | |
3481 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3482 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3483 | break; |
139ac872 | 3484 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3485 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3486 | break; |
44a5e5eb | 3487 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3488 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3489 | break; |
3490 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3491 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3492 | break; |
3493 | case LTTNG_HEALTH_CONSUMER: | |
3494 | reply.ret_code = check_consumer_health(); | |
3495 | break; | |
0b2dc8df MD |
3496 | case LTTNG_HEALTH_HT_CLEANUP: |
3497 | reply.ret_code = health_check_state(HEALTH_TYPE_HT_CLEANUP); | |
3498 | break; | |
380e8d6f MD |
3499 | case LTTNG_HEALTH_APP_MANAGE_NOTIFY: |
3500 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY); | |
3501 | break; | |
12e2b881 MD |
3502 | case LTTNG_HEALTH_APP_REG_DISPATCH: |
3503 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
3504 | break; | |
44a5e5eb | 3505 | case LTTNG_HEALTH_ALL: |
44a5e5eb | 3506 | reply.ret_code = |
927ca06a DG |
3507 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3508 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3509 | health_check_state(HEALTH_TYPE_CMD) && | |
3510 | health_check_state(HEALTH_TYPE_KERNEL) && | |
0b2dc8df | 3511 | check_consumer_health() && |
380e8d6f | 3512 | health_check_state(HEALTH_TYPE_HT_CLEANUP) && |
12e2b881 MD |
3513 | health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY) && |
3514 | health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
44a5e5eb DG |
3515 | break; |
3516 | default: | |
f73fabfd | 3517 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3518 | break; |
3519 | } | |
3520 | ||
3521 | /* | |
3522 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3523 | * the client where in the sessiond it is the opposite. Again, this is | |
3524 | * just to make things easier for us poor developer which enjoy a lot | |
3525 | * lazyness. | |
3526 | */ | |
3527 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3528 | reply.ret_code = !reply.ret_code; | |
3529 | } | |
3530 | ||
3531 | DBG2("Health check return value %d", reply.ret_code); | |
3532 | ||
3533 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3534 | if (ret < 0) { | |
3535 | ERR("Failed to send health data back to client"); | |
3536 | } | |
3537 | ||
3538 | /* End of transmission */ | |
3539 | ret = close(new_sock); | |
3540 | if (ret) { | |
3541 | PERROR("close"); | |
3542 | } | |
3543 | new_sock = -1; | |
3544 | } | |
3545 | ||
139ac872 | 3546 | exit: |
44a5e5eb | 3547 | error: |
139ac872 MD |
3548 | if (err) { |
3549 | ERR("Health error occurred in %s", __func__); | |
3550 | } | |
44a5e5eb DG |
3551 | DBG("Health check thread dying"); |
3552 | unlink(health_unix_sock_path); | |
3553 | if (sock >= 0) { | |
3554 | ret = close(sock); | |
3555 | if (ret) { | |
3556 | PERROR("close"); | |
3557 | } | |
3558 | } | |
44a5e5eb DG |
3559 | |
3560 | lttng_poll_clean(&events); | |
3561 | ||
3562 | rcu_unregister_thread(); | |
3563 | return NULL; | |
3564 | } | |
3565 | ||
1d4b027a | 3566 | /* |
d063d709 DG |
3567 | * This thread manage all clients request using the unix client socket for |
3568 | * communication. | |
1d4b027a DG |
3569 | */ |
3570 | static void *thread_manage_clients(void *data) | |
3571 | { | |
139ac872 | 3572 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3573 | int sock_error; |
5eb91c98 | 3574 | uint32_t revents, nb_fd; |
273ea72c | 3575 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3576 | struct lttng_poll_event events; |
1d4b027a DG |
3577 | |
3578 | DBG("[thread] Manage client started"); | |
3579 | ||
f6a9efaa DG |
3580 | rcu_register_thread(); |
3581 | ||
927ca06a DG |
3582 | health_register(HEALTH_TYPE_CMD); |
3583 | ||
6993eeb3 CB |
3584 | if (testpoint(thread_manage_clients)) { |
3585 | goto error_testpoint; | |
3586 | } | |
3587 | ||
840cb59c | 3588 | health_code_update(); |
44a5e5eb | 3589 | |
1d4b027a DG |
3590 | ret = lttcomm_listen_unix_sock(client_sock); |
3591 | if (ret < 0) { | |
35df2755 | 3592 | goto error_listen; |
1d4b027a DG |
3593 | } |
3594 | ||
5eb91c98 DG |
3595 | /* |
3596 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3597 | * more will be added to this poll set. | |
3598 | */ | |
d0b96690 | 3599 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3600 | if (ret < 0) { |
35df2755 | 3601 | goto error_create_poll; |
5eb91c98 | 3602 | } |
273ea72c | 3603 | |
5eb91c98 DG |
3604 | /* Add the application registration socket */ |
3605 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3606 | if (ret < 0) { | |
3607 | goto error; | |
3608 | } | |
273ea72c | 3609 | |
bbd973c2 DG |
3610 | /* |
3611 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3612 | */ |
3613 | if (opt_sig_parent) { | |
8db8d1dc | 3614 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3615 | } |
3616 | ||
6993eeb3 CB |
3617 | if (testpoint(thread_manage_clients_before_loop)) { |
3618 | goto error; | |
3619 | } | |
8ac94142 | 3620 | |
840cb59c | 3621 | health_code_update(); |
44a5e5eb | 3622 | |
1d4b027a | 3623 | while (1) { |
1d4b027a | 3624 | DBG("Accepting client command ..."); |
273ea72c DG |
3625 | |
3626 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3627 | restart: |
a78af745 | 3628 | health_poll_entry(); |
5eb91c98 | 3629 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3630 | health_poll_exit(); |
273ea72c | 3631 | if (ret < 0) { |
88f2b785 MD |
3632 | /* |
3633 | * Restart interrupted system call. | |
3634 | */ | |
3635 | if (errno == EINTR) { | |
3636 | goto restart; | |
3637 | } | |
273ea72c DG |
3638 | goto error; |
3639 | } | |
3640 | ||
0d9c5d77 DG |
3641 | nb_fd = ret; |
3642 | ||
5eb91c98 DG |
3643 | for (i = 0; i < nb_fd; i++) { |
3644 | /* Fetch once the poll data */ | |
3645 | revents = LTTNG_POLL_GETEV(&events, i); | |
3646 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3647 | ||
840cb59c | 3648 | health_code_update(); |
44a5e5eb | 3649 | |
5eb91c98 | 3650 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3651 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3652 | if (ret) { |
139ac872 MD |
3653 | err = 0; |
3654 | goto exit; | |
5eb91c98 DG |
3655 | } |
3656 | ||
3657 | /* Event on the registration socket */ | |
3658 | if (pollfd == client_sock) { | |
3659 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3660 | ERR("Client socket poll error"); | |
3661 | goto error; | |
3662 | } | |
3663 | } | |
3664 | } | |
3665 | ||
3666 | DBG("Wait for client response"); | |
3667 | ||
840cb59c | 3668 | health_code_update(); |
44a5e5eb | 3669 | |
5eb91c98 DG |
3670 | sock = lttcomm_accept_unix_sock(client_sock); |
3671 | if (sock < 0) { | |
273ea72c | 3672 | goto error; |
273ea72c DG |
3673 | } |
3674 | ||
b662582b DG |
3675 | /* |
3676 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3677 | * show must go on. | |
3678 | */ | |
3679 | (void) utils_set_fd_cloexec(sock); | |
3680 | ||
be040666 DG |
3681 | /* Set socket option for credentials retrieval */ |
3682 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3683 | if (ret < 0) { | |
3684 | goto error; | |
3685 | } | |
3686 | ||
5eb91c98 | 3687 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3688 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3689 | if (cmd_ctx == NULL) { |
76d7553f | 3690 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3691 | goto error; |
5eb91c98 | 3692 | } |
1d4b027a | 3693 | |
5eb91c98 | 3694 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3695 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3696 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3697 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3698 | goto error; |
3699 | } | |
1d4b027a | 3700 | |
5eb91c98 DG |
3701 | cmd_ctx->llm = NULL; |
3702 | cmd_ctx->session = NULL; | |
1d4b027a | 3703 | |
840cb59c | 3704 | health_code_update(); |
44a5e5eb | 3705 | |
5eb91c98 DG |
3706 | /* |
3707 | * Data is received from the lttng client. The struct | |
3708 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3709 | * the client. | |
3710 | */ | |
3711 | DBG("Receiving data from client ..."); | |
be040666 DG |
3712 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3713 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3714 | if (ret <= 0) { |
3715 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3716 | ret = close(sock); |
3717 | if (ret) { | |
3718 | PERROR("close"); | |
3719 | } | |
3720 | sock = -1; | |
a2c0da86 | 3721 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3722 | continue; |
3723 | } | |
1d4b027a | 3724 | |
840cb59c | 3725 | health_code_update(); |
44a5e5eb | 3726 | |
5eb91c98 DG |
3727 | // TODO: Validate cmd_ctx including sanity check for |
3728 | // security purpose. | |
f7776ea7 | 3729 | |
f6a9efaa | 3730 | rcu_thread_online(); |
5eb91c98 DG |
3731 | /* |
3732 | * This function dispatch the work to the kernel or userspace tracer | |
3733 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3734 | * informations for the client. The command context struct contains | |
3735 | * everything this function may needs. | |
3736 | */ | |
53a80697 | 3737 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3738 | rcu_thread_offline(); |
5eb91c98 | 3739 | if (ret < 0) { |
36134aa1 DG |
3740 | ret = close(sock); |
3741 | if (ret) { | |
3742 | PERROR("close"); | |
53a80697 | 3743 | } |
36134aa1 | 3744 | sock = -1; |
bbd973c2 | 3745 | /* |
5eb91c98 | 3746 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3747 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3748 | * (ENOMEM). Error detected but still accept |
3749 | * command, unless a socket error has been | |
3750 | * detected. | |
bbd973c2 | 3751 | */ |
bbd973c2 | 3752 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3753 | continue; |
3754 | } | |
d6e4fca4 | 3755 | |
840cb59c | 3756 | health_code_update(); |
44a5e5eb | 3757 | |
54d01ffb DG |
3758 | DBG("Sending response (size: %d, retcode: %s)", |
3759 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3760 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3761 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3762 | if (ret < 0) { |
3763 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3764 | } |
1d4b027a | 3765 | |
5eb91c98 | 3766 | /* End of transmission */ |
76d7553f MD |
3767 | ret = close(sock); |
3768 | if (ret) { | |
3769 | PERROR("close"); | |
3770 | } | |
3771 | sock = -1; | |
be040666 DG |
3772 | |
3773 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3774 | |
840cb59c | 3775 | health_code_update(); |
273ea72c DG |
3776 | } |
3777 | ||
139ac872 | 3778 | exit: |
5eb91c98 | 3779 | error: |
35df2755 CB |
3780 | if (sock >= 0) { |
3781 | ret = close(sock); | |
3782 | if (ret) { | |
3783 | PERROR("close"); | |
3784 | } | |
139ac872 | 3785 | } |
44a5e5eb | 3786 | |
35df2755 CB |
3787 | lttng_poll_clean(&events); |
3788 | clean_command_ctx(&cmd_ctx); | |
3789 | ||
3790 | error_listen: | |
3791 | error_create_poll: | |
6993eeb3 | 3792 | error_testpoint: |
273ea72c | 3793 | unlink(client_unix_sock_path); |
76d7553f MD |
3794 | if (client_sock >= 0) { |
3795 | ret = close(client_sock); | |
3796 | if (ret) { | |
3797 | PERROR("close"); | |
3798 | } | |
a4b35e07 | 3799 | } |
35df2755 CB |
3800 | |
3801 | if (err) { | |
840cb59c | 3802 | health_error(); |
35df2755 | 3803 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3804 | } |
273ea72c | 3805 | |
927ca06a | 3806 | health_unregister(); |
35df2755 CB |
3807 | |
3808 | DBG("Client thread dying"); | |
f6a9efaa DG |
3809 | |
3810 | rcu_unregister_thread(); | |
1d4b027a DG |
3811 | return NULL; |
3812 | } | |
3813 | ||
3814 | ||
fac6795d DG |
3815 | /* |
3816 | * usage function on stderr | |
3817 | */ | |
3818 | static void usage(void) | |
3819 | { | |
b716ce68 | 3820 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3821 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3822 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3823 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3824 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3825 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3826 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3827 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3828 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3829 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3830 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3831 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3832 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3833 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3834 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3835 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3836 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3837 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3838 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3839 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3840 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3841 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3842 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3843 | } |
3844 | ||
3845 | /* | |
3846 | * daemon argument parsing | |
3847 | */ | |
3848 | static int parse_args(int argc, char **argv) | |
3849 | { | |
3850 | int c; | |
3851 | ||
3852 | static struct option long_options[] = { | |
3853 | { "client-sock", 1, 0, 'c' }, | |
3854 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3855 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3856 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3857 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3858 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3859 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3860 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3861 | { "consumerd32-path", 1, 0, 'u' }, | |
3862 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3863 | { "consumerd64-path", 1, 0, 't' }, | |
3864 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3865 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3866 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3867 | { "help", 0, 0, 'h' }, |
3868 | { "group", 1, 0, 'g' }, | |
3869 | { "version", 0, 0, 'V' }, | |
75462a81 | 3870 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3871 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3872 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3873 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3874 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3875 | { NULL, 0, 0, 0 } |
3876 | }; | |
3877 | ||
3878 | while (1) { | |
3879 | int option_index = 0; | |
35f90c40 | 3880 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3881 | long_options, &option_index); |
fac6795d DG |
3882 | if (c == -1) { |
3883 | break; | |
3884 | } | |
3885 | ||
3886 | switch (c) { | |
3887 | case 0: | |
3888 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3889 | if (optarg) { | |
3890 | fprintf(stderr, " with arg %s\n", optarg); | |
3891 | } | |
3892 | break; | |
b716ce68 | 3893 | case 'c': |
fac6795d DG |
3894 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3895 | break; | |
3896 | case 'a': | |
3897 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3898 | break; | |
3899 | case 'd': | |
3900 | opt_daemon = 1; | |
3901 | break; | |
3902 | case 'g': | |
fb09408a | 3903 | opt_tracing_group = optarg; |
fac6795d DG |
3904 | break; |
3905 | case 'h': | |
3906 | usage(); | |
3907 | exit(EXIT_FAILURE); | |
3908 | case 'V': | |
3909 | fprintf(stdout, "%s\n", VERSION); | |
3910 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3911 | case 'S': |
3912 | opt_sig_parent = 1; | |
3913 | break; | |
d6f42150 | 3914 | case 'E': |
3bd1e081 | 3915 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3916 | break; |
3917 | case 'C': | |
3bd1e081 MD |
3918 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3919 | break; | |
3920 | case 'F': | |
7753dea8 | 3921 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3922 | break; |
3923 | case 'D': | |
7753dea8 MD |
3924 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3925 | break; | |
3926 | case 'H': | |
3927 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3928 | break; | |
3929 | case 'G': | |
3930 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3931 | break; |
4fba7219 DG |
3932 | case 'N': |
3933 | opt_no_kernel = 1; | |
3934 | break; | |
75462a81 | 3935 | case 'q': |
97e19046 | 3936 | lttng_opt_quiet = 1; |
75462a81 | 3937 | break; |
3f9947db | 3938 | case 'v': |
53086306 | 3939 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3940 | lttng_opt_verbose += 1; |
3f9947db | 3941 | break; |
31f73cc9 | 3942 | case 'Z': |
3bd1e081 | 3943 | opt_verbose_consumer += 1; |
31f73cc9 | 3944 | break; |
fb09408a | 3945 | case 'u': |
fc7a59ce | 3946 | consumerd32_bin= optarg; |
ebaeda94 MD |
3947 | break; |
3948 | case 'U': | |
3949 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3950 | break; |
3951 | case 't': | |
fc7a59ce | 3952 | consumerd64_bin = optarg; |
ebaeda94 MD |
3953 | break; |
3954 | case 'T': | |
3955 | consumerd64_libdir = optarg; | |
fb09408a | 3956 | break; |
35f90c40 DG |
3957 | case 'p': |
3958 | opt_pidfile = optarg; | |
3959 | break; | |
fac6795d DG |
3960 | default: |
3961 | /* Unknown option or other error. | |
3962 | * Error is printed by getopt, just return */ | |
3963 | return -1; | |
3964 | } | |
3965 | } | |
3966 | ||
3967 | return 0; | |
3968 | } | |
3969 | ||
3970 | /* | |
d063d709 | 3971 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3972 | * apps_sock - The communication socket for all UST apps. |
3973 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3974 | */ |
cf3af59e | 3975 | static int init_daemon_socket(void) |
fac6795d DG |
3976 | { |
3977 | int ret = 0; | |
3978 | mode_t old_umask; | |
3979 | ||
3980 | old_umask = umask(0); | |
3981 | ||
3982 | /* Create client tool unix socket */ | |
d6f42150 DG |
3983 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3984 | if (client_sock < 0) { | |
3985 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3986 | ret = -1; |
3987 | goto end; | |
3988 | } | |
3989 | ||
b662582b DG |
3990 | /* Set the cloexec flag */ |
3991 | ret = utils_set_fd_cloexec(client_sock); | |
3992 | if (ret < 0) { | |
3993 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3994 | "Continuing but note that the consumer daemon will have a " | |
3995 | "reference to this socket on exec()", client_sock); | |
3996 | } | |
3997 | ||
fac6795d DG |
3998 | /* File permission MUST be 660 */ |
3999 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4000 | if (ret < 0) { | |
d6f42150 | 4001 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4002 | PERROR("chmod"); |
fac6795d DG |
4003 | goto end; |
4004 | } | |
4005 | ||
4006 | /* Create the application unix socket */ | |
d6f42150 DG |
4007 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4008 | if (apps_sock < 0) { | |
4009 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4010 | ret = -1; |
4011 | goto end; | |
4012 | } | |
4013 | ||
b662582b DG |
4014 | /* Set the cloexec flag */ |
4015 | ret = utils_set_fd_cloexec(apps_sock); | |
4016 | if (ret < 0) { | |
4017 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
4018 | "Continuing but note that the consumer daemon will have a " | |
4019 | "reference to this socket on exec()", apps_sock); | |
4020 | } | |
4021 | ||
d6f42150 | 4022 | /* File permission MUST be 666 */ |
54d01ffb DG |
4023 | ret = chmod(apps_unix_sock_path, |
4024 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4025 | if (ret < 0) { |
d6f42150 | 4026 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4027 | PERROR("chmod"); |
fac6795d DG |
4028 | goto end; |
4029 | } | |
4030 | ||
b662582b DG |
4031 | DBG3("Session daemon client socket %d and application socket %d created", |
4032 | client_sock, apps_sock); | |
4033 | ||
fac6795d DG |
4034 | end: |
4035 | umask(old_umask); | |
4036 | return ret; | |
4037 | } | |
4038 | ||
4039 | /* | |
54d01ffb DG |
4040 | * Check if the global socket is available, and if a daemon is answering at the |
4041 | * other side. If yes, error is returned. | |
fac6795d | 4042 | */ |
cf3af59e | 4043 | static int check_existing_daemon(void) |
fac6795d | 4044 | { |
7d8234d9 | 4045 | /* Is there anybody out there ? */ |
099e26bd | 4046 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4047 | return -EEXIST; |
099e26bd | 4048 | } |
b09c7c76 DG |
4049 | |
4050 | return 0; | |
fac6795d DG |
4051 | } |
4052 | ||
fac6795d | 4053 | /* |
d063d709 | 4054 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4055 | * |
d063d709 | 4056 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4057 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4058 | */ |
be040666 | 4059 | static int set_permissions(char *rundir) |
fac6795d DG |
4060 | { |
4061 | int ret; | |
996b65c8 | 4062 | gid_t gid; |
fac6795d | 4063 | |
6775595e DG |
4064 | ret = allowed_group(); |
4065 | if (ret < 0) { | |
be040666 DG |
4066 | WARN("No tracing group detected"); |
4067 | ret = 0; | |
fac6795d DG |
4068 | goto end; |
4069 | } | |
4070 | ||
6775595e DG |
4071 | gid = ret; |
4072 | ||
d6f42150 | 4073 | /* Set lttng run dir */ |
be040666 | 4074 | ret = chown(rundir, 0, gid); |
d6f42150 | 4075 | if (ret < 0) { |
be040666 | 4076 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4077 | PERROR("chown"); |
d6f42150 DG |
4078 | } |
4079 | ||
d1613cf5 | 4080 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4081 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4082 | if (ret < 0) { |
4083 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4084 | PERROR("chmod"); |
d1613cf5 JN |
4085 | } |
4086 | ||
d6f42150 | 4087 | /* lttng client socket path */ |
996b65c8 | 4088 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4089 | if (ret < 0) { |
d6f42150 | 4090 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4091 | PERROR("chown"); |
d6f42150 DG |
4092 | } |
4093 | ||
3bd1e081 MD |
4094 | /* kconsumer error socket path */ |
4095 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4096 | if (ret < 0) { |
3bd1e081 | 4097 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4098 | PERROR("chown"); |
3bd1e081 MD |
4099 | } |
4100 | ||
7753dea8 MD |
4101 | /* 64-bit ustconsumer error socket path */ |
4102 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4103 | if (ret < 0) { | |
4104 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4105 | PERROR("chown"); |
7753dea8 MD |
4106 | } |
4107 | ||
4108 | /* 32-bit ustconsumer compat32 error socket path */ | |
4109 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4110 | if (ret < 0) { |
7753dea8 | 4111 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4112 | PERROR("chown"); |
fac6795d DG |
4113 | } |
4114 | ||
d6f42150 | 4115 | DBG("All permissions are set"); |
e07ae692 | 4116 | |
fac6795d DG |
4117 | end: |
4118 | return ret; | |
4119 | } | |
4120 | ||
d6f42150 | 4121 | /* |
d063d709 | 4122 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4123 | */ |
67e40797 | 4124 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4125 | { |
4126 | int ret; | |
4127 | ||
67e40797 DG |
4128 | DBG3("Creating LTTng run directory: %s", rundir); |
4129 | ||
d1613cf5 | 4130 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4131 | if (ret < 0) { |
b1f11e69 | 4132 | if (errno != EEXIST) { |
67e40797 | 4133 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4134 | goto error; |
4135 | } else { | |
4136 | ret = 0; | |
4137 | } | |
d6f42150 DG |
4138 | } |
4139 | ||
4140 | error: | |
4141 | return ret; | |
4142 | } | |
4143 | ||
4144 | /* | |
d063d709 DG |
4145 | * Setup sockets and directory needed by the kconsumerd communication with the |
4146 | * session daemon. | |
d6f42150 | 4147 | */ |
67e40797 DG |
4148 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4149 | const char *rundir) | |
d6f42150 DG |
4150 | { |
4151 | int ret; | |
67e40797 | 4152 | char path[PATH_MAX]; |
d6f42150 | 4153 | |
67e40797 | 4154 | switch (consumer_data->type) { |
7753dea8 | 4155 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4156 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4157 | break; |
4158 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4159 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4160 | break; |
4161 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4162 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4163 | break; |
4164 | default: | |
4165 | ERR("Consumer type unknown"); | |
4166 | ret = -EINVAL; | |
4167 | goto error; | |
d6f42150 DG |
4168 | } |
4169 | ||
67e40797 DG |
4170 | DBG2("Creating consumer directory: %s", path); |
4171 | ||
d1613cf5 | 4172 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4173 | if (ret < 0) { |
6beb2242 | 4174 | if (errno != EEXIST) { |
f11e84c2 | 4175 | PERROR("mkdir"); |
3bd1e081 | 4176 | ERR("Failed to create %s", path); |
6beb2242 DG |
4177 | goto error; |
4178 | } | |
f11e84c2 | 4179 | ret = -1; |
d6f42150 DG |
4180 | } |
4181 | ||
4182 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4183 | consumer_data->err_sock = |
4184 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4185 | if (consumer_data->err_sock < 0) { | |
4186 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4187 | ret = -1; |
4188 | goto error; | |
4189 | } | |
4190 | ||
a24f05ab MD |
4191 | /* |
4192 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4193 | * show must go on. | |
4194 | */ | |
4195 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
4196 | if (ret < 0) { | |
4197 | PERROR("utils_set_fd_cloexec"); | |
4198 | /* continue anyway */ | |
4199 | } | |
4200 | ||
d6f42150 | 4201 | /* File permission MUST be 660 */ |
3bd1e081 | 4202 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4203 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4204 | if (ret < 0) { |
3bd1e081 | 4205 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4206 | PERROR("chmod"); |
d6f42150 DG |
4207 | goto error; |
4208 | } | |
4209 | ||
4210 | error: | |
4211 | return ret; | |
4212 | } | |
4213 | ||
fac6795d | 4214 | /* |
d063d709 | 4215 | * Signal handler for the daemon |
cf3af59e | 4216 | * |
54d01ffb DG |
4217 | * Simply stop all worker threads, leaving main() return gracefully after |
4218 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4219 | */ |
4220 | static void sighandler(int sig) | |
4221 | { | |
4222 | switch (sig) { | |
cf3af59e | 4223 | case SIGPIPE: |
af87c45a | 4224 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4225 | return; |
4226 | case SIGINT: | |
af87c45a | 4227 | DBG("SIGINT caught"); |
cf3af59e MD |
4228 | stop_threads(); |
4229 | break; | |
4230 | case SIGTERM: | |
af87c45a | 4231 | DBG("SIGTERM caught"); |
cf3af59e MD |
4232 | stop_threads(); |
4233 | break; | |
4234 | default: | |
4235 | break; | |
fac6795d | 4236 | } |
fac6795d DG |
4237 | } |
4238 | ||
4239 | /* | |
d063d709 | 4240 | * Setup signal handler for : |
1d4b027a | 4241 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4242 | */ |
1d4b027a | 4243 | static int set_signal_handler(void) |
fac6795d | 4244 | { |
1d4b027a DG |
4245 | int ret = 0; |
4246 | struct sigaction sa; | |
4247 | sigset_t sigset; | |
fac6795d | 4248 | |
1d4b027a | 4249 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4250 | PERROR("sigemptyset"); |
1d4b027a DG |
4251 | return ret; |
4252 | } | |
d6f42150 | 4253 | |
1d4b027a DG |
4254 | sa.sa_handler = sighandler; |
4255 | sa.sa_mask = sigset; | |
4256 | sa.sa_flags = 0; | |
4257 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4258 | PERROR("sigaction"); |
1d4b027a | 4259 | return ret; |
d6f42150 DG |
4260 | } |
4261 | ||
1d4b027a | 4262 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4263 | PERROR("sigaction"); |
1d4b027a | 4264 | return ret; |
d6f42150 | 4265 | } |
aaf26714 | 4266 | |
1d4b027a | 4267 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4268 | PERROR("sigaction"); |
1d4b027a | 4269 | return ret; |
8c0faa1d DG |
4270 | } |
4271 | ||
1d4b027a DG |
4272 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4273 | ||
4274 | return ret; | |
fac6795d DG |
4275 | } |
4276 | ||
f3ed775e | 4277 | /* |
d063d709 DG |
4278 | * Set open files limit to unlimited. This daemon can open a large number of |
4279 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4280 | */ |
4281 | static void set_ulimit(void) | |
4282 | { | |
4283 | int ret; | |
4284 | struct rlimit lim; | |
4285 | ||
a88df331 | 4286 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4287 | lim.rlim_cur = 65535; |
4288 | lim.rlim_max = 65535; | |
4289 | ||
4290 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4291 | if (ret < 0) { | |
76d7553f | 4292 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4293 | } |
4294 | } | |
4295 | ||
35f90c40 DG |
4296 | /* |
4297 | * Write pidfile using the rundir and opt_pidfile. | |
4298 | */ | |
4299 | static void write_pidfile(void) | |
4300 | { | |
4301 | int ret; | |
4302 | char pidfile_path[PATH_MAX]; | |
4303 | ||
4304 | assert(rundir); | |
4305 | ||
4306 | if (opt_pidfile) { | |
4307 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
4308 | } else { | |
4309 | /* Build pidfile path from rundir and opt_pidfile. */ | |
4310 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
4311 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
4312 | if (ret < 0) { | |
4313 | PERROR("snprintf pidfile path"); | |
4314 | goto error; | |
4315 | } | |
4316 | } | |
4317 | ||
4318 | /* | |
4319 | * Create pid file in rundir. Return value is of no importance. The | |
4320 | * execution will continue even though we are not able to write the file. | |
4321 | */ | |
4322 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
4323 | ||
4324 | error: | |
4325 | return; | |
4326 | } | |
4327 | ||
fac6795d DG |
4328 | /* |
4329 | * main | |
4330 | */ | |
4331 | int main(int argc, char **argv) | |
4332 | { | |
fac6795d DG |
4333 | int ret = 0; |
4334 | void *status; | |
ae9e45b3 | 4335 | const char *home_path, *env_app_timeout; |
fac6795d | 4336 | |
335a95b7 MD |
4337 | init_kernel_workarounds(); |
4338 | ||
f6a9efaa DG |
4339 | rcu_register_thread(); |
4340 | ||
7753dea8 | 4341 | setup_consumerd_path(); |
fb09408a | 4342 | |
12744796 DG |
4343 | page_size = sysconf(_SC_PAGESIZE); |
4344 | if (page_size < 0) { | |
4345 | PERROR("sysconf _SC_PAGESIZE"); | |
4346 | page_size = LONG_MAX; | |
4347 | WARN("Fallback page size to %ld", page_size); | |
4348 | } | |
4349 | ||
fac6795d DG |
4350 | /* Parse arguments */ |
4351 | progname = argv[0]; | |
c617c0c6 | 4352 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 4353 | goto error; |
fac6795d DG |
4354 | } |
4355 | ||
4356 | /* Daemonize */ | |
4357 | if (opt_daemon) { | |
ceed52b5 MD |
4358 | int i; |
4359 | ||
4360 | /* | |
4361 | * fork | |
4362 | * child: setsid, close FD 0, 1, 2, chdir / | |
4363 | * parent: exit (if fork is successful) | |
4364 | */ | |
53094c05 DG |
4365 | ret = daemon(0, 0); |
4366 | if (ret < 0) { | |
76d7553f | 4367 | PERROR("daemon"); |
cf3af59e | 4368 | goto error; |
53094c05 | 4369 | } |
ceed52b5 MD |
4370 | /* |
4371 | * We are in the child. Make sure all other file | |
4372 | * descriptors are closed, in case we are called with | |
4373 | * more opened file descriptors than the standard ones. | |
4374 | */ | |
4375 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4376 | (void) close(i); | |
4377 | } | |
4378 | } | |
4379 | ||
4380 | /* Create thread quit pipe */ | |
4381 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4382 | goto error; | |
fac6795d DG |
4383 | } |
4384 | ||
4385 | /* Check if daemon is UID = 0 */ | |
4386 | is_root = !getuid(); | |
4387 | ||
fac6795d | 4388 | if (is_root) { |
990570ed | 4389 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4390 | |
4391 | /* Create global run dir with root access */ | |
4392 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4393 | if (ret < 0) { |
cf3af59e | 4394 | goto error; |
d6f42150 DG |
4395 | } |
4396 | ||
fac6795d | 4397 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4398 | snprintf(apps_unix_sock_path, PATH_MAX, |
4399 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4400 | } |
4401 | ||
4402 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4403 | snprintf(client_unix_sock_path, PATH_MAX, |
4404 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4405 | } | |
0fdd1e2c DG |
4406 | |
4407 | /* Set global SHM for ust */ | |
4408 | if (strlen(wait_shm_path) == 0) { | |
4409 | snprintf(wait_shm_path, PATH_MAX, | |
4410 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4411 | } | |
67e40797 | 4412 | |
44a5e5eb DG |
4413 | if (strlen(health_unix_sock_path) == 0) { |
4414 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4415 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4416 | } | |
4417 | ||
67e40797 DG |
4418 | /* Setup kernel consumerd path */ |
4419 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4420 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4421 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4422 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4423 | |
4424 | DBG2("Kernel consumer err path: %s", | |
4425 | kconsumer_data.err_unix_sock_path); | |
4426 | DBG2("Kernel consumer cmd path: %s", | |
4427 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4428 | } else { |
feb0f3e5 | 4429 | home_path = utils_get_home_dir(); |
b082db07 | 4430 | if (home_path == NULL) { |
273ea72c DG |
4431 | /* TODO: Add --socket PATH option */ |
4432 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4433 | ret = -EPERM; |
4434 | goto error; | |
b082db07 DG |
4435 | } |
4436 | ||
67e40797 DG |
4437 | /* |
4438 | * Create rundir from home path. This will create something like | |
4439 | * $HOME/.lttng | |
4440 | */ | |
990570ed | 4441 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4442 | if (ret < 0) { |
4443 | ret = -ENOMEM; | |
4444 | goto error; | |
4445 | } | |
4446 | ||
4447 | ret = create_lttng_rundir(rundir); | |
4448 | if (ret < 0) { | |
4449 | goto error; | |
4450 | } | |
4451 | ||
fac6795d | 4452 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4453 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4454 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4455 | } |
4456 | ||
4457 | /* Set the cli tool unix socket path */ | |
4458 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4459 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4460 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4461 | } |
0fdd1e2c DG |
4462 | |
4463 | /* Set global SHM for ust */ | |
4464 | if (strlen(wait_shm_path) == 0) { | |
4465 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4466 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4467 | } |
44a5e5eb DG |
4468 | |
4469 | /* Set health check Unix path */ | |
4470 | if (strlen(health_unix_sock_path) == 0) { | |
4471 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4472 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4473 | } | |
fac6795d DG |
4474 | } |
4475 | ||
5c827ce0 DG |
4476 | /* Set consumer initial state */ |
4477 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4478 | ust_consumerd_state = CONSUMER_STOPPED; | |
4479 | ||
847177cd DG |
4480 | DBG("Client socket path %s", client_unix_sock_path); |
4481 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4482 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4483 | DBG("LTTng run directory path: %s", rundir); |
4484 | ||
4485 | /* 32 bits consumerd path setup */ | |
4486 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4487 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4488 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4489 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4490 | |
4491 | DBG2("UST consumer 32 bits err path: %s", | |
4492 | ustconsumer32_data.err_unix_sock_path); | |
4493 | DBG2("UST consumer 32 bits cmd path: %s", | |
4494 | ustconsumer32_data.cmd_unix_sock_path); | |
4495 | ||
4496 | /* 64 bits consumerd path setup */ | |
4497 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4498 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4499 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4500 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4501 | |
4502 | DBG2("UST consumer 64 bits err path: %s", | |
4503 | ustconsumer64_data.err_unix_sock_path); | |
4504 | DBG2("UST consumer 64 bits cmd path: %s", | |
4505 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4506 | |
273ea72c | 4507 | /* |
7d8234d9 | 4508 | * See if daemon already exist. |
fac6795d | 4509 | */ |
7d8234d9 | 4510 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4511 | ERR("Already running daemon.\n"); |
273ea72c | 4512 | /* |
cf3af59e MD |
4513 | * We do not goto exit because we must not cleanup() |
4514 | * because a daemon is already running. | |
ab118b20 | 4515 | */ |
cf3af59e | 4516 | goto error; |
a88df331 DG |
4517 | } |
4518 | ||
1427f9b2 DG |
4519 | /* |
4520 | * Init UST app hash table. Alloc hash table before this point since | |
4521 | * cleanup() can get called after that point. | |
4522 | */ | |
4523 | ust_app_ht_alloc(); | |
4524 | ||
54d01ffb | 4525 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4526 | |
4527 | /* | |
4528 | * These actions must be executed as root. We do that *after* setting up | |
4529 | * the sockets path because we MUST make the check for another daemon using | |
4530 | * those paths *before* trying to set the kernel consumer sockets and init | |
4531 | * kernel tracer. | |
4532 | */ | |
4533 | if (is_root) { | |
67e40797 | 4534 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4535 | if (ret < 0) { |
4536 | goto exit; | |
4537 | } | |
4538 | ||
a88df331 | 4539 | /* Setup kernel tracer */ |
4fba7219 DG |
4540 | if (!opt_no_kernel) { |
4541 | init_kernel_tracer(); | |
4542 | } | |
a88df331 DG |
4543 | |
4544 | /* Set ulimit for open files */ | |
4545 | set_ulimit(); | |
fac6795d | 4546 | } |
4063050c MD |
4547 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4548 | lttng_fd_init(); | |
fac6795d | 4549 | |
67e40797 DG |
4550 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4551 | if (ret < 0) { | |
4552 | goto exit; | |
4553 | } | |
4554 | ||
4555 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4556 | if (ret < 0) { | |
4557 | goto exit; | |
4558 | } | |
4559 | ||
cf3af59e MD |
4560 | if ((ret = set_signal_handler()) < 0) { |
4561 | goto exit; | |
fac6795d DG |
4562 | } |
4563 | ||
d6f42150 | 4564 | /* Setup the needed unix socket */ |
cf3af59e MD |
4565 | if ((ret = init_daemon_socket()) < 0) { |
4566 | goto exit; | |
fac6795d DG |
4567 | } |
4568 | ||
4569 | /* Set credentials to socket */ | |
be040666 | 4570 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4571 | goto exit; |
fac6795d DG |
4572 | } |
4573 | ||
5b8719f5 DG |
4574 | /* Get parent pid if -S, --sig-parent is specified. */ |
4575 | if (opt_sig_parent) { | |
4576 | ppid = getppid(); | |
4577 | } | |
4578 | ||
7a485870 | 4579 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4580 | if (is_root && !opt_no_kernel) { |
4581 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4582 | goto exit; | |
4583 | } | |
7a485870 DG |
4584 | } |
4585 | ||
0b2dc8df MD |
4586 | /* Setup the thread ht_cleanup communication pipe. */ |
4587 | if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) { | |
4588 | goto exit; | |
4589 | } | |
4590 | ||
099e26bd | 4591 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4592 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4593 | goto exit; |
4594 | } | |
4595 | ||
d0b96690 DG |
4596 | /* Setup the thread apps notify communication pipe. */ |
4597 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
4598 | goto exit; | |
4599 | } | |
4600 | ||
7972aab2 DG |
4601 | /* Initialize global buffer per UID and PID registry. */ |
4602 | buffer_reg_init_uid_registry(); | |
4603 | buffer_reg_init_pid_registry(); | |
4604 | ||
099e26bd DG |
4605 | /* Init UST command queue. */ |
4606 | cds_wfq_init(&ust_cmd_queue.queue); | |
4607 | ||
273ea72c | 4608 | /* |
54d01ffb DG |
4609 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4610 | * statically declared in session.c | |
273ea72c | 4611 | */ |
54d01ffb | 4612 | session_list_ptr = session_get_list(); |
b5541356 | 4613 | |
5eb91c98 DG |
4614 | /* Set up max poll set size */ |
4615 | lttng_poll_set_max_size(); | |
4616 | ||
2f77fc4b | 4617 | cmd_init(); |
00e2e675 | 4618 | |
ae9e45b3 DG |
4619 | /* Check for the application socket timeout env variable. */ |
4620 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4621 | if (env_app_timeout) { | |
4622 | app_socket_timeout = atoi(env_app_timeout); | |
4623 | } else { | |
4624 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4625 | } | |
4626 | ||
35f90c40 DG |
4627 | write_pidfile(); |
4628 | ||
0b2dc8df MD |
4629 | /* Create thread to manage the client socket */ |
4630 | ret = pthread_create(&ht_cleanup_thread, NULL, | |
4631 | thread_ht_cleanup, (void *) NULL); | |
4632 | if (ret != 0) { | |
4633 | PERROR("pthread_create ht_cleanup"); | |
4634 | goto exit_ht_cleanup; | |
4635 | } | |
4636 | ||
44a5e5eb DG |
4637 | /* Create thread to manage the client socket */ |
4638 | ret = pthread_create(&health_thread, NULL, | |
4639 | thread_manage_health, (void *) NULL); | |
4640 | if (ret != 0) { | |
4641 | PERROR("pthread_create health"); | |
4642 | goto exit_health; | |
4643 | } | |
4644 | ||
cf3af59e | 4645 | /* Create thread to manage the client socket */ |
099e26bd DG |
4646 | ret = pthread_create(&client_thread, NULL, |
4647 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4648 | if (ret != 0) { |
76d7553f | 4649 | PERROR("pthread_create clients"); |
cf3af59e MD |
4650 | goto exit_client; |
4651 | } | |
fac6795d | 4652 | |
099e26bd DG |
4653 | /* Create thread to dispatch registration */ |
4654 | ret = pthread_create(&dispatch_thread, NULL, | |
4655 | thread_dispatch_ust_registration, (void *) NULL); | |
4656 | if (ret != 0) { | |
76d7553f | 4657 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4658 | goto exit_dispatch; |
4659 | } | |
4660 | ||
4661 | /* Create thread to manage application registration. */ | |
4662 | ret = pthread_create(®_apps_thread, NULL, | |
4663 | thread_registration_apps, (void *) NULL); | |
4664 | if (ret != 0) { | |
76d7553f | 4665 | PERROR("pthread_create registration"); |
099e26bd DG |
4666 | goto exit_reg_apps; |
4667 | } | |
4668 | ||
cf3af59e | 4669 | /* Create thread to manage application socket */ |
54d01ffb DG |
4670 | ret = pthread_create(&apps_thread, NULL, |
4671 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4672 | if (ret != 0) { |
d0b96690 DG |
4673 | PERROR("pthread_create apps"); |
4674 | goto exit_apps; | |
4675 | } | |
4676 | ||
4677 | /* Create thread to manage application notify socket */ | |
4678 | ret = pthread_create(&apps_notify_thread, NULL, | |
4679 | ust_thread_manage_notify, (void *) NULL); | |
4680 | if (ret != 0) { | |
76d7553f | 4681 | PERROR("pthread_create apps"); |
cf3af59e MD |
4682 | goto exit_apps; |
4683 | } | |
fac6795d | 4684 | |
6620da75 DG |
4685 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4686 | if (is_root && !opt_no_kernel) { | |
4687 | /* Create kernel thread to manage kernel event */ | |
4688 | ret = pthread_create(&kernel_thread, NULL, | |
4689 | thread_manage_kernel, (void *) NULL); | |
4690 | if (ret != 0) { | |
4691 | PERROR("pthread_create kernel"); | |
4692 | goto exit_kernel; | |
4693 | } | |
7a485870 | 4694 | |
6620da75 DG |
4695 | ret = pthread_join(kernel_thread, &status); |
4696 | if (ret != 0) { | |
4697 | PERROR("pthread_join"); | |
4698 | goto error; /* join error, exit without cleanup */ | |
4699 | } | |
fac6795d DG |
4700 | } |
4701 | ||
cf3af59e MD |
4702 | exit_kernel: |
4703 | ret = pthread_join(apps_thread, &status); | |
4704 | if (ret != 0) { | |
76d7553f | 4705 | PERROR("pthread_join"); |
cf3af59e MD |
4706 | goto error; /* join error, exit without cleanup */ |
4707 | } | |
fac6795d | 4708 | |
cf3af59e | 4709 | exit_apps: |
099e26bd DG |
4710 | ret = pthread_join(reg_apps_thread, &status); |
4711 | if (ret != 0) { | |
76d7553f | 4712 | PERROR("pthread_join"); |
099e26bd DG |
4713 | goto error; /* join error, exit without cleanup */ |
4714 | } | |
4715 | ||
4716 | exit_reg_apps: | |
4717 | ret = pthread_join(dispatch_thread, &status); | |
4718 | if (ret != 0) { | |
76d7553f | 4719 | PERROR("pthread_join"); |
099e26bd DG |
4720 | goto error; /* join error, exit without cleanup */ |
4721 | } | |
4722 | ||
4723 | exit_dispatch: | |
cf3af59e MD |
4724 | ret = pthread_join(client_thread, &status); |
4725 | if (ret != 0) { | |
76d7553f | 4726 | PERROR("pthread_join"); |
cf3af59e MD |
4727 | goto error; /* join error, exit without cleanup */ |
4728 | } | |
4729 | ||
3bd1e081 | 4730 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4731 | if (ret != 0) { |
76d7553f | 4732 | PERROR("join_consumer"); |
cf3af59e MD |
4733 | goto error; /* join error, exit without cleanup */ |
4734 | } | |
a88df331 | 4735 | |
06f525de DG |
4736 | ret = join_consumer_thread(&ustconsumer32_data); |
4737 | if (ret != 0) { | |
4738 | PERROR("join_consumer ust32"); | |
4739 | goto error; /* join error, exit without cleanup */ | |
4740 | } | |
4741 | ||
4742 | ret = join_consumer_thread(&ustconsumer64_data); | |
4743 | if (ret != 0) { | |
4744 | PERROR("join_consumer ust64"); | |
4745 | goto error; /* join error, exit without cleanup */ | |
4746 | } | |
4747 | ||
cf3af59e | 4748 | exit_client: |
06f525de DG |
4749 | ret = pthread_join(health_thread, &status); |
4750 | if (ret != 0) { | |
4751 | PERROR("pthread_join health thread"); | |
4752 | goto error; /* join error, exit without cleanup */ | |
4753 | } | |
4754 | ||
44a5e5eb | 4755 | exit_health: |
0b2dc8df MD |
4756 | ret = pthread_join(ht_cleanup_thread, &status); |
4757 | if (ret != 0) { | |
4758 | PERROR("pthread_join ht cleanup thread"); | |
4759 | goto error; /* join error, exit without cleanup */ | |
4760 | } | |
4761 | exit_ht_cleanup: | |
a88df331 | 4762 | exit: |
cf3af59e MD |
4763 | /* |
4764 | * cleanup() is called when no other thread is running. | |
4765 | */ | |
f6a9efaa | 4766 | rcu_thread_online(); |
cf3af59e | 4767 | cleanup(); |
f6a9efaa DG |
4768 | rcu_thread_offline(); |
4769 | rcu_unregister_thread(); | |
67e40797 | 4770 | if (!ret) { |
cf3af59e | 4771 | exit(EXIT_SUCCESS); |
67e40797 | 4772 | } |
cf3af59e | 4773 | error: |
5e16da05 | 4774 | exit(EXIT_FAILURE); |
fac6795d | 4775 | } |