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 | } |
5c786ded JD |
678 | /* Update the stream global counter */ |
679 | ksess->stream_count_global += ret; | |
d9800920 | 680 | |
7a485870 | 681 | /* |
5eb91c98 DG |
682 | * Have we already sent fds to the consumer? If yes, it means |
683 | * that tracing is started so it is safe to send our updated | |
684 | * stream fds. | |
7a485870 | 685 | */ |
173af62f DG |
686 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
687 | struct lttng_ht_iter iter; | |
688 | struct consumer_socket *socket; | |
689 | ||
e7fe706f | 690 | rcu_read_lock(); |
173af62f DG |
691 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
692 | &iter.iter, socket, node.node) { | |
693 | /* Code flow error */ | |
694 | assert(socket->fd >= 0); | |
695 | ||
696 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 697 | ret = kernel_consumer_send_channel_stream(socket, |
2bba9e53 DG |
698 | channel, ksess, |
699 | session->output_traces ? 1 : 0); | |
173af62f DG |
700 | pthread_mutex_unlock(socket->lock); |
701 | if (ret < 0) { | |
e7fe706f | 702 | rcu_read_unlock(); |
173af62f DG |
703 | goto error; |
704 | } | |
7a485870 | 705 | } |
e7fe706f | 706 | rcu_read_unlock(); |
7a485870 | 707 | } |
b3c750d2 | 708 | goto error; |
7a485870 DG |
709 | } |
710 | } | |
54d01ffb | 711 | session_unlock(session); |
7a485870 | 712 | } |
54d01ffb | 713 | session_unlock_list(); |
b3c750d2 | 714 | return ret; |
7a485870 | 715 | |
b3c750d2 | 716 | error: |
54d01ffb DG |
717 | session_unlock(session); |
718 | session_unlock_list(); | |
7a485870 DG |
719 | return ret; |
720 | } | |
721 | ||
487cf67c | 722 | /* |
ffe60014 DG |
723 | * For each tracing session, update newly registered apps. The session list |
724 | * lock MUST be acquired before calling this. | |
487cf67c DG |
725 | */ |
726 | static void update_ust_app(int app_sock) | |
727 | { | |
728 | struct ltt_session *sess, *stmp; | |
729 | ||
730 | /* For all tracing session(s) */ | |
731 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 732 | session_lock(sess); |
421cb601 DG |
733 | if (sess->ust_session) { |
734 | ust_app_global_update(sess->ust_session, app_sock); | |
735 | } | |
4ee14516 | 736 | session_unlock(sess); |
487cf67c DG |
737 | } |
738 | } | |
739 | ||
7a485870 | 740 | /* |
d063d709 | 741 | * This thread manage event coming from the kernel. |
7a485870 | 742 | * |
d063d709 DG |
743 | * Features supported in this thread: |
744 | * -) CPU Hotplug | |
7a485870 DG |
745 | */ |
746 | static void *thread_manage_kernel(void *data) | |
747 | { | |
139ac872 | 748 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 749 | uint32_t revents, nb_fd; |
7a485870 | 750 | char tmp; |
5eb91c98 | 751 | struct lttng_poll_event events; |
7a485870 | 752 | |
6993eeb3 | 753 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 754 | |
927ca06a DG |
755 | health_register(HEALTH_TYPE_KERNEL); |
756 | ||
d5d63bf1 DG |
757 | /* |
758 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 759 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 760 | */ |
6d737ce4 | 761 | lttng_poll_init(&events); |
d5d63bf1 | 762 | |
6993eeb3 CB |
763 | if (testpoint(thread_manage_kernel)) { |
764 | goto error_testpoint; | |
765 | } | |
8ac94142 | 766 | |
840cb59c | 767 | health_code_update(); |
44a5e5eb | 768 | |
6993eeb3 | 769 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 770 | goto error_testpoint; |
6993eeb3 CB |
771 | } |
772 | ||
7a485870 | 773 | while (1) { |
840cb59c | 774 | health_code_update(); |
44a5e5eb | 775 | |
7a485870 | 776 | if (update_poll_flag == 1) { |
d21b0d71 DG |
777 | /* Clean events object. We are about to populate it again. */ |
778 | lttng_poll_clean(&events); | |
779 | ||
d0b96690 | 780 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
781 | if (ret < 0) { |
782 | goto error_poll_create; | |
783 | } | |
784 | ||
785 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
786 | if (ret < 0) { | |
787 | goto error; | |
788 | } | |
5f822d0a | 789 | |
d21b0d71 | 790 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
791 | ret = update_kernel_poll(&events); |
792 | if (ret < 0) { | |
7a485870 DG |
793 | goto error; |
794 | } | |
795 | update_poll_flag = 0; | |
796 | } | |
797 | ||
d21b0d71 | 798 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
799 | |
800 | /* Poll infinite value of time */ | |
88f2b785 | 801 | restart: |
a78af745 | 802 | health_poll_entry(); |
5eb91c98 | 803 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 804 | health_poll_exit(); |
7a485870 | 805 | if (ret < 0) { |
88f2b785 MD |
806 | /* |
807 | * Restart interrupted system call. | |
808 | */ | |
809 | if (errno == EINTR) { | |
810 | goto restart; | |
811 | } | |
7a485870 DG |
812 | goto error; |
813 | } else if (ret == 0) { | |
814 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
815 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
816 | "This should not have happened! Continuing..."); | |
7a485870 DG |
817 | continue; |
818 | } | |
819 | ||
0d9c5d77 DG |
820 | nb_fd = ret; |
821 | ||
5eb91c98 DG |
822 | for (i = 0; i < nb_fd; i++) { |
823 | /* Fetch once the poll data */ | |
824 | revents = LTTNG_POLL_GETEV(&events, i); | |
825 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 826 | |
840cb59c | 827 | health_code_update(); |
44a5e5eb | 828 | |
5eb91c98 | 829 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 830 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 831 | if (ret) { |
139ac872 MD |
832 | err = 0; |
833 | goto exit; | |
5eb91c98 | 834 | } |
7a485870 | 835 | |
5eb91c98 DG |
836 | /* Check for data on kernel pipe */ |
837 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
838 | do { |
839 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
840 | } while (ret < 0 && errno == EINTR); | |
841 | /* | |
842 | * Ret value is useless here, if this pipe gets any actions an | |
843 | * update is required anyway. | |
844 | */ | |
5eb91c98 DG |
845 | update_poll_flag = 1; |
846 | continue; | |
847 | } else { | |
848 | /* | |
849 | * New CPU detected by the kernel. Adding kernel stream to | |
850 | * kernel session and updating the kernel consumer | |
851 | */ | |
852 | if (revents & LPOLLIN) { | |
2bdd86d4 | 853 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
854 | if (ret < 0) { |
855 | continue; | |
856 | } | |
857 | break; | |
858 | /* | |
859 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
860 | * and unregister kernel stream at this point. | |
861 | */ | |
7a485870 | 862 | } |
7a485870 DG |
863 | } |
864 | } | |
865 | } | |
866 | ||
139ac872 | 867 | exit: |
7a485870 | 868 | error: |
5eb91c98 | 869 | lttng_poll_clean(&events); |
76d7553f | 870 | error_poll_create: |
6993eeb3 | 871 | error_testpoint: |
6620da75 DG |
872 | utils_close_pipe(kernel_poll_pipe); |
873 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 874 | if (err) { |
840cb59c | 875 | health_error(); |
139ac872 | 876 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
877 | WARN("Kernel thread died unexpectedly. " |
878 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 879 | } |
927ca06a | 880 | health_unregister(); |
76d7553f | 881 | DBG("Kernel thread dying"); |
7a485870 DG |
882 | return NULL; |
883 | } | |
884 | ||
a23ec3a7 DG |
885 | /* |
886 | * Signal pthread condition of the consumer data that the thread. | |
887 | */ | |
888 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
889 | { | |
890 | pthread_mutex_lock(&data->cond_mutex); | |
891 | ||
892 | /* | |
893 | * The state is set before signaling. It can be any value, it's the waiter | |
894 | * job to correctly interpret this condition variable associated to the | |
895 | * consumer pthread_cond. | |
896 | * | |
897 | * A value of 0 means that the corresponding thread of the consumer data | |
898 | * was not started. 1 indicates that the thread has started and is ready | |
899 | * for action. A negative value means that there was an error during the | |
900 | * thread bootstrap. | |
901 | */ | |
902 | data->consumer_thread_is_ready = state; | |
903 | (void) pthread_cond_signal(&data->cond); | |
904 | ||
905 | pthread_mutex_unlock(&data->cond_mutex); | |
906 | } | |
907 | ||
1d4b027a | 908 | /* |
3bd1e081 | 909 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 910 | */ |
3bd1e081 | 911 | static void *thread_manage_consumer(void *data) |
1d4b027a | 912 | { |
139ac872 | 913 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 914 | uint32_t revents, nb_fd; |
1d4b027a | 915 | enum lttcomm_return_code code; |
5eb91c98 | 916 | struct lttng_poll_event events; |
3bd1e081 | 917 | struct consumer_data *consumer_data = data; |
1d4b027a | 918 | |
3bd1e081 | 919 | DBG("[thread] Manage consumer started"); |
1d4b027a | 920 | |
927ca06a DG |
921 | health_register(HEALTH_TYPE_CONSUMER); |
922 | ||
855060f8 | 923 | health_code_update(); |
9449cc75 | 924 | |
5eb91c98 | 925 | /* |
331744e3 JD |
926 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
927 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 928 | */ |
331744e3 | 929 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 930 | if (ret < 0) { |
76d7553f | 931 | goto error_poll; |
5eb91c98 | 932 | } |
273ea72c | 933 | |
edb8b045 DG |
934 | /* |
935 | * The error socket here is already in a listening state which was done | |
936 | * just before spawning this thread to avoid a race between the consumer | |
937 | * daemon exec trying to connect and the listen() call. | |
938 | */ | |
3bd1e081 | 939 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
940 | if (ret < 0) { |
941 | goto error; | |
942 | } | |
943 | ||
840cb59c | 944 | health_code_update(); |
44a5e5eb | 945 | |
331744e3 | 946 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 947 | restart: |
a78af745 | 948 | health_poll_entry(); |
8ac94142 | 949 | |
6993eeb3 CB |
950 | if (testpoint(thread_manage_consumer)) { |
951 | goto error; | |
952 | } | |
8ac94142 | 953 | |
5eb91c98 | 954 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 955 | health_poll_exit(); |
273ea72c | 956 | if (ret < 0) { |
88f2b785 MD |
957 | /* |
958 | * Restart interrupted system call. | |
959 | */ | |
960 | if (errno == EINTR) { | |
961 | goto restart; | |
962 | } | |
273ea72c DG |
963 | goto error; |
964 | } | |
965 | ||
0d9c5d77 DG |
966 | nb_fd = ret; |
967 | ||
5eb91c98 DG |
968 | for (i = 0; i < nb_fd; i++) { |
969 | /* Fetch once the poll data */ | |
970 | revents = LTTNG_POLL_GETEV(&events, i); | |
971 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
972 | ||
840cb59c | 973 | health_code_update(); |
44a5e5eb | 974 | |
5eb91c98 | 975 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 976 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 977 | if (ret) { |
139ac872 MD |
978 | err = 0; |
979 | goto exit; | |
5eb91c98 DG |
980 | } |
981 | ||
982 | /* Event on the registration socket */ | |
3bd1e081 | 983 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 984 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 985 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
986 | goto error; |
987 | } | |
988 | } | |
273ea72c DG |
989 | } |
990 | ||
3bd1e081 | 991 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
992 | if (sock < 0) { |
993 | goto error; | |
994 | } | |
995 | ||
b662582b DG |
996 | /* |
997 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
998 | * show must go on. | |
999 | */ | |
1000 | (void) utils_set_fd_cloexec(sock); | |
1001 | ||
840cb59c | 1002 | health_code_update(); |
44a5e5eb | 1003 | |
3bd1e081 | 1004 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1005 | |
712ea556 | 1006 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1007 | ret = lttcomm_recv_unix_sock(sock, &code, |
1008 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1009 | if (ret <= 0) { |
1010 | goto error; | |
1011 | } | |
1012 | ||
840cb59c | 1013 | health_code_update(); |
44a5e5eb | 1014 | |
f73fabfd | 1015 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1016 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1017 | consumer_data->cmd_sock = |
1018 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
331744e3 JD |
1019 | consumer_data->metadata_sock.fd = |
1020 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1021 | if (consumer_data->cmd_sock < 0 || | |
1022 | consumer_data->metadata_sock.fd < 0) { | |
1023 | PERROR("consumer connect cmd socket"); | |
a23ec3a7 DG |
1024 | /* On error, signal condition and quit. */ |
1025 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1026 | goto error; |
1027 | } | |
331744e3 JD |
1028 | /* Create metadata socket lock. */ |
1029 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1030 | if (consumer_data->metadata_sock.lock == NULL) { | |
1031 | PERROR("zmalloc pthread mutex"); | |
1032 | ret = -1; | |
1033 | goto error; | |
1034 | } | |
1035 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1036 | ||
a23ec3a7 | 1037 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1038 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1039 | DBG("Consumer metadata socket ready (fd: %d)", | |
1040 | consumer_data->metadata_sock.fd); | |
1d4b027a | 1041 | } else { |
3bd1e081 | 1042 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1043 | lttcomm_get_readable_code(-code)); |
1044 | goto error; | |
1045 | } | |
1046 | ||
331744e3 | 1047 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1048 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1049 | if (ret < 0) { |
72079cae DG |
1050 | goto error; |
1051 | } | |
1052 | ||
331744e3 | 1053 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1054 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1055 | if (ret < 0) { | |
72079cae | 1056 | goto error; |
5eb91c98 DG |
1057 | } |
1058 | ||
331744e3 JD |
1059 | /* Add metadata socket that is successfully connected. */ |
1060 | ret = lttng_poll_add(&events, consumer_data->metadata_sock.fd, | |
1061 | LPOLLIN | LPOLLRDHUP); | |
1062 | if (ret < 0) { | |
1063 | goto error; | |
1064 | } | |
1065 | ||
840cb59c | 1066 | health_code_update(); |
44a5e5eb | 1067 | |
331744e3 | 1068 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1069 | restart_poll: |
331744e3 JD |
1070 | while (1) { |
1071 | health_poll_entry(); | |
1072 | ret = lttng_poll_wait(&events, -1); | |
1073 | health_poll_exit(); | |
1074 | if (ret < 0) { | |
1075 | /* | |
1076 | * Restart interrupted system call. | |
1077 | */ | |
1078 | if (errno == EINTR) { | |
1079 | goto restart_poll; | |
1080 | } | |
1081 | goto error; | |
88f2b785 | 1082 | } |
72079cae | 1083 | |
331744e3 | 1084 | nb_fd = ret; |
0d9c5d77 | 1085 | |
331744e3 JD |
1086 | for (i = 0; i < nb_fd; i++) { |
1087 | /* Fetch once the poll data */ | |
1088 | revents = LTTNG_POLL_GETEV(&events, i); | |
1089 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1090 | |
331744e3 | 1091 | health_code_update(); |
44a5e5eb | 1092 | |
331744e3 JD |
1093 | /* Thread quit pipe has been closed. Killing thread. */ |
1094 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
1095 | if (ret) { | |
1096 | err = 0; | |
1097 | goto exit; | |
1098 | } | |
5eb91c98 | 1099 | |
331744e3 JD |
1100 | if (pollfd == sock) { |
1101 | /* Event on the consumerd socket */ | |
1102 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1103 | ERR("consumer err socket second poll error"); | |
1104 | goto error; | |
1105 | } | |
1106 | health_code_update(); | |
1107 | /* Wait for any kconsumerd error */ | |
1108 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1109 | sizeof(enum lttcomm_return_code)); | |
1110 | if (ret <= 0) { | |
1111 | ERR("consumer closed the command socket"); | |
1112 | goto error; | |
1113 | } | |
1114 | ||
1115 | ERR("consumer return code : %s", | |
1116 | lttcomm_get_readable_code(-code)); | |
1117 | ||
1118 | goto exit; | |
1119 | } else if (pollfd == consumer_data->metadata_sock.fd) { | |
1120 | /* UST metadata requests */ | |
1121 | ret = ust_consumer_metadata_request( | |
1122 | &consumer_data->metadata_sock); | |
1123 | if (ret < 0) { | |
1124 | ERR("Handling metadata request"); | |
1125 | goto error; | |
1126 | } | |
1127 | break; | |
1128 | } else { | |
1129 | ERR("Unknown pollfd"); | |
5eb91c98 DG |
1130 | goto error; |
1131 | } | |
1132 | } | |
331744e3 | 1133 | health_code_update(); |
5eb91c98 DG |
1134 | } |
1135 | ||
139ac872 | 1136 | exit: |
1d4b027a | 1137 | error: |
5c827ce0 DG |
1138 | /* Immediately set the consumerd state to stopped */ |
1139 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1140 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1141 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1142 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1143 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1144 | } else { | |
1145 | /* Code flow error... */ | |
1146 | assert(0); | |
1147 | } | |
1148 | ||
76d7553f MD |
1149 | if (consumer_data->err_sock >= 0) { |
1150 | ret = close(consumer_data->err_sock); | |
1151 | if (ret) { | |
1152 | PERROR("close"); | |
1153 | } | |
a76cbd9f | 1154 | consumer_data->err_sock = -1; |
76d7553f MD |
1155 | } |
1156 | if (consumer_data->cmd_sock >= 0) { | |
1157 | ret = close(consumer_data->cmd_sock); | |
1158 | if (ret) { | |
1159 | PERROR("close"); | |
1160 | } | |
a76cbd9f | 1161 | consumer_data->cmd_sock = -1; |
76d7553f | 1162 | } |
331744e3 JD |
1163 | if (consumer_data->metadata_sock.fd >= 0) { |
1164 | ret = close(consumer_data->metadata_sock.fd); | |
1165 | if (ret) { | |
1166 | PERROR("close"); | |
1167 | } | |
1168 | } | |
1169 | /* Cleanup metadata socket mutex. */ | |
1170 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1171 | free(consumer_data->metadata_sock.lock); | |
1172 | ||
76d7553f MD |
1173 | if (sock >= 0) { |
1174 | ret = close(sock); | |
1175 | if (ret) { | |
1176 | PERROR("close"); | |
1177 | } | |
1178 | } | |
273ea72c | 1179 | |
3bd1e081 MD |
1180 | unlink(consumer_data->err_unix_sock_path); |
1181 | unlink(consumer_data->cmd_unix_sock_path); | |
1182 | consumer_data->pid = 0; | |
1d4b027a | 1183 | |
5eb91c98 | 1184 | lttng_poll_clean(&events); |
76d7553f | 1185 | error_poll: |
139ac872 | 1186 | if (err) { |
840cb59c | 1187 | health_error(); |
139ac872 MD |
1188 | ERR("Health error occurred in %s", __func__); |
1189 | } | |
927ca06a | 1190 | health_unregister(); |
76d7553f | 1191 | DBG("consumer thread cleanup completed"); |
0177d773 | 1192 | |
5eb91c98 | 1193 | return NULL; |
099e26bd DG |
1194 | } |
1195 | ||
099e26bd DG |
1196 | /* |
1197 | * This thread manage application communication. | |
1d4b027a DG |
1198 | */ |
1199 | static void *thread_manage_apps(void *data) | |
099e26bd | 1200 | { |
139ac872 | 1201 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1202 | uint32_t revents, nb_fd; |
5eb91c98 | 1203 | struct lttng_poll_event events; |
099e26bd DG |
1204 | |
1205 | DBG("[thread] Manage application started"); | |
1206 | ||
f6a9efaa DG |
1207 | rcu_register_thread(); |
1208 | rcu_thread_online(); | |
1209 | ||
927ca06a DG |
1210 | health_register(HEALTH_TYPE_APP_MANAGE); |
1211 | ||
6993eeb3 CB |
1212 | if (testpoint(thread_manage_apps)) { |
1213 | goto error_testpoint; | |
1214 | } | |
1215 | ||
840cb59c | 1216 | health_code_update(); |
44a5e5eb | 1217 | |
d0b96690 | 1218 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1219 | if (ret < 0) { |
76d7553f | 1220 | goto error_poll_create; |
5eb91c98 | 1221 | } |
099e26bd | 1222 | |
5eb91c98 DG |
1223 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1224 | if (ret < 0) { | |
1225 | goto error; | |
1226 | } | |
099e26bd | 1227 | |
6993eeb3 CB |
1228 | if (testpoint(thread_manage_apps_before_loop)) { |
1229 | goto error; | |
1230 | } | |
8ac94142 | 1231 | |
840cb59c | 1232 | health_code_update(); |
44a5e5eb | 1233 | |
5eb91c98 | 1234 | while (1) { |
d21b0d71 | 1235 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1236 | |
1237 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1238 | restart: |
a78af745 | 1239 | health_poll_entry(); |
5eb91c98 | 1240 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1241 | health_poll_exit(); |
099e26bd | 1242 | if (ret < 0) { |
88f2b785 MD |
1243 | /* |
1244 | * Restart interrupted system call. | |
1245 | */ | |
1246 | if (errno == EINTR) { | |
1247 | goto restart; | |
1248 | } | |
099e26bd DG |
1249 | goto error; |
1250 | } | |
1251 | ||
0d9c5d77 DG |
1252 | nb_fd = ret; |
1253 | ||
5eb91c98 DG |
1254 | for (i = 0; i < nb_fd; i++) { |
1255 | /* Fetch once the poll data */ | |
1256 | revents = LTTNG_POLL_GETEV(&events, i); | |
1257 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1258 | ||
840cb59c | 1259 | health_code_update(); |
44a5e5eb | 1260 | |
5eb91c98 | 1261 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1262 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1263 | if (ret) { |
139ac872 MD |
1264 | err = 0; |
1265 | goto exit; | |
5eb91c98 | 1266 | } |
099e26bd | 1267 | |
5eb91c98 DG |
1268 | /* Inspect the apps cmd pipe */ |
1269 | if (pollfd == apps_cmd_pipe[0]) { | |
1270 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1271 | ERR("Apps command pipe error"); | |
0177d773 | 1272 | goto error; |
5eb91c98 | 1273 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1274 | int sock; |
1275 | ||
5eb91c98 | 1276 | /* Empty pipe */ |
f921c78f | 1277 | do { |
d0b96690 | 1278 | ret = read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
f921c78f | 1279 | } while (ret < 0 && errno == EINTR); |
d0b96690 | 1280 | if (ret < 0 || ret < sizeof(sock)) { |
76d7553f | 1281 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1282 | goto error; |
1283 | } | |
099e26bd | 1284 | |
840cb59c | 1285 | health_code_update(); |
44a5e5eb | 1286 | |
ffe60014 | 1287 | /* |
d0b96690 DG |
1288 | * We only monitor the error events of the socket. This |
1289 | * thread does not handle any incoming data from UST | |
1290 | * (POLLIN). | |
ffe60014 | 1291 | */ |
d0b96690 DG |
1292 | ret = lttng_poll_add(&events, sock, |
1293 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1294 | if (ret < 0) { | |
5eb91c98 | 1295 | goto error; |
e0c7ec2b | 1296 | } |
acc7b41b | 1297 | |
d0b96690 DG |
1298 | /* Set socket timeout for both receiving and ending */ |
1299 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
1300 | app_socket_timeout); | |
1301 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
1302 | app_socket_timeout); | |
ae9e45b3 | 1303 | |
d0b96690 | 1304 | DBG("Apps with sock %d added to poll set", sock); |
487cf67c | 1305 | |
840cb59c | 1306 | health_code_update(); |
44a5e5eb | 1307 | |
5eb91c98 | 1308 | break; |
0177d773 | 1309 | } |
5eb91c98 DG |
1310 | } else { |
1311 | /* | |
54d01ffb DG |
1312 | * At this point, we know that a registered application made |
1313 | * the event at poll_wait. | |
5eb91c98 DG |
1314 | */ |
1315 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1316 | /* Removing from the poll set */ | |
1317 | ret = lttng_poll_del(&events, pollfd); | |
1318 | if (ret < 0) { | |
1319 | goto error; | |
1320 | } | |
099e26bd | 1321 | |
b9d9b220 | 1322 | /* Socket closed on remote end. */ |
56fff090 | 1323 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1324 | break; |
1325 | } | |
099e26bd | 1326 | } |
44a5e5eb | 1327 | |
840cb59c | 1328 | health_code_update(); |
099e26bd | 1329 | } |
099e26bd DG |
1330 | } |
1331 | ||
139ac872 | 1332 | exit: |
099e26bd | 1333 | error: |
5eb91c98 | 1334 | lttng_poll_clean(&events); |
76d7553f | 1335 | error_poll_create: |
6993eeb3 | 1336 | error_testpoint: |
6620da75 DG |
1337 | utils_close_pipe(apps_cmd_pipe); |
1338 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1339 | ||
1340 | /* | |
1341 | * We don't clean the UST app hash table here since already registered | |
1342 | * applications can still be controlled so let them be until the session | |
1343 | * daemon dies or the applications stop. | |
1344 | */ | |
1345 | ||
139ac872 | 1346 | if (err) { |
840cb59c | 1347 | health_error(); |
139ac872 MD |
1348 | ERR("Health error occurred in %s", __func__); |
1349 | } | |
927ca06a | 1350 | health_unregister(); |
76d7553f | 1351 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1352 | rcu_thread_offline(); |
1353 | rcu_unregister_thread(); | |
099e26bd DG |
1354 | return NULL; |
1355 | } | |
1356 | ||
d0b96690 | 1357 | /* |
d88aee68 DG |
1358 | * Send a socket to a thread This is called from the dispatch UST registration |
1359 | * thread once all sockets are set for the application. | |
d0b96690 DG |
1360 | * |
1361 | * On success, return 0 else a negative value being the errno message of the | |
1362 | * write(). | |
1363 | */ | |
d88aee68 | 1364 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 DG |
1365 | { |
1366 | int ret; | |
1367 | ||
d0b96690 | 1368 | /* Sockets MUST be set or else this should not have been called. */ |
d88aee68 DG |
1369 | assert(fd >= 0); |
1370 | assert(sock >= 0); | |
d0b96690 DG |
1371 | |
1372 | do { | |
d88aee68 | 1373 | ret = write(fd, &sock, sizeof(sock)); |
d0b96690 | 1374 | } while (ret < 0 && errno == EINTR); |
d88aee68 DG |
1375 | if (ret < 0 || ret != sizeof(sock)) { |
1376 | PERROR("write apps pipe %d", fd); | |
d0b96690 DG |
1377 | if (ret < 0) { |
1378 | ret = -errno; | |
1379 | } | |
1380 | goto error; | |
1381 | } | |
1382 | ||
1383 | /* All good. Don't send back the write positive ret value. */ | |
1384 | ret = 0; | |
1385 | error: | |
1386 | return ret; | |
1387 | } | |
1388 | ||
f45e313d DG |
1389 | /* |
1390 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1391 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1392 | * notify socket is never received. | |
1393 | */ | |
1394 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1395 | { | |
1396 | int ret, nb_fd = 0, i; | |
1397 | unsigned int fd_added = 0; | |
1398 | struct lttng_poll_event events; | |
1399 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1400 | ||
1401 | assert(wait_queue); | |
1402 | ||
1403 | lttng_poll_init(&events); | |
1404 | ||
1405 | /* Just skip everything for an empty queue. */ | |
1406 | if (!wait_queue->count) { | |
1407 | goto end; | |
1408 | } | |
1409 | ||
1410 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1411 | if (ret < 0) { | |
1412 | goto error_create; | |
1413 | } | |
1414 | ||
1415 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1416 | &wait_queue->head, head) { | |
1417 | assert(wait_node->app); | |
1418 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1419 | LPOLLHUP | LPOLLERR); | |
1420 | if (ret < 0) { | |
1421 | goto error; | |
1422 | } | |
1423 | ||
1424 | fd_added = 1; | |
1425 | } | |
1426 | ||
1427 | if (!fd_added) { | |
1428 | goto end; | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * Poll but don't block so we can quickly identify the faulty events and | |
1433 | * clean them afterwards from the wait queue. | |
1434 | */ | |
1435 | ret = lttng_poll_wait(&events, 0); | |
1436 | if (ret < 0) { | |
1437 | goto error; | |
1438 | } | |
1439 | nb_fd = ret; | |
1440 | ||
1441 | for (i = 0; i < nb_fd; i++) { | |
1442 | /* Get faulty FD. */ | |
1443 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1444 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1445 | ||
1446 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1447 | &wait_queue->head, head) { | |
1448 | if (pollfd == wait_node->app->sock && | |
1449 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1450 | cds_list_del(&wait_node->head); | |
1451 | wait_queue->count--; | |
1452 | ust_app_destroy(wait_node->app); | |
1453 | free(wait_node); | |
1454 | break; | |
1455 | } | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | if (nb_fd > 0) { | |
1460 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1461 | } | |
1462 | ||
1463 | end: | |
1464 | lttng_poll_clean(&events); | |
1465 | return; | |
1466 | ||
1467 | error: | |
1468 | lttng_poll_clean(&events); | |
1469 | error_create: | |
1470 | ERR("Unable to sanitize wait queue"); | |
1471 | return; | |
1472 | } | |
1473 | ||
099e26bd DG |
1474 | /* |
1475 | * Dispatch request from the registration threads to the application | |
1476 | * communication thread. | |
1477 | */ | |
1478 | static void *thread_dispatch_ust_registration(void *data) | |
1479 | { | |
12e2b881 | 1480 | int ret, err = -1; |
099e26bd DG |
1481 | struct cds_wfq_node *node; |
1482 | struct ust_command *ust_cmd = NULL; | |
f45e313d DG |
1483 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1484 | struct ust_reg_wait_queue wait_queue = { | |
1485 | .count = 0, | |
1486 | }; | |
d0b96690 | 1487 | |
12e2b881 MD |
1488 | health_register(HEALTH_TYPE_APP_REG_DISPATCH); |
1489 | ||
1490 | health_code_update(); | |
1491 | ||
f45e313d | 1492 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1493 | |
1494 | DBG("[thread] Dispatch UST command started"); | |
1495 | ||
26c9d55e | 1496 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1497 | health_code_update(); |
1498 | ||
099e26bd DG |
1499 | /* Atomically prepare the queue futex */ |
1500 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1501 | ||
1502 | do { | |
d0b96690 | 1503 | struct ust_app *app = NULL; |
7972aab2 | 1504 | ust_cmd = NULL; |
d0b96690 | 1505 | |
f45e313d DG |
1506 | /* |
1507 | * Make sure we don't have node(s) that have hung up before receiving | |
1508 | * the notify socket. This is to clean the list in order to avoid | |
1509 | * memory leaks from notify socket that are never seen. | |
1510 | */ | |
1511 | sanitize_wait_queue(&wait_queue); | |
1512 | ||
12e2b881 | 1513 | health_code_update(); |
099e26bd DG |
1514 | /* Dequeue command for registration */ |
1515 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1516 | if (node == NULL) { | |
00a17c97 | 1517 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1518 | /* Continue thread execution */ |
1519 | break; | |
1520 | } | |
1521 | ||
1522 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1523 | ||
2f50c8a3 DG |
1524 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1525 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1526 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1527 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1528 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1529 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1530 | |
1531 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1532 | wait_node = zmalloc(sizeof(*wait_node)); | |
1533 | if (!wait_node) { | |
1534 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1535 | ret = close(ust_cmd->sock); |
1536 | if (ret < 0) { | |
1537 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1538 | } | |
1539 | lttng_fd_put(1, LTTNG_FD_APPS); | |
7972aab2 | 1540 | free(ust_cmd); |
d0b96690 DG |
1541 | goto error; |
1542 | } | |
1543 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1544 | ||
1545 | /* Create application object if socket is CMD. */ | |
1546 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1547 | ust_cmd->sock); | |
1548 | if (!wait_node->app) { | |
1549 | ret = close(ust_cmd->sock); | |
1550 | if (ret < 0) { | |
1551 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1552 | } |
d88aee68 DG |
1553 | lttng_fd_put(1, LTTNG_FD_APPS); |
1554 | free(wait_node); | |
7972aab2 | 1555 | free(ust_cmd); |
d0b96690 DG |
1556 | continue; |
1557 | } | |
1558 | /* | |
1559 | * Add application to the wait queue so we can set the notify | |
1560 | * socket before putting this object in the global ht. | |
1561 | */ | |
f45e313d DG |
1562 | cds_list_add(&wait_node->head, &wait_queue.head); |
1563 | wait_queue.count++; | |
d0b96690 | 1564 | |
7972aab2 | 1565 | free(ust_cmd); |
d0b96690 DG |
1566 | /* |
1567 | * We have to continue here since we don't have the notify | |
1568 | * socket and the application MUST be added to the hash table | |
1569 | * only at that moment. | |
1570 | */ | |
1571 | continue; | |
1572 | } else { | |
1573 | /* | |
1574 | * Look for the application in the local wait queue and set the | |
1575 | * notify socket if found. | |
1576 | */ | |
d88aee68 | 1577 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1578 | &wait_queue.head, head) { |
12e2b881 | 1579 | health_code_update(); |
d0b96690 DG |
1580 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1581 | wait_node->app->notify_sock = ust_cmd->sock; | |
1582 | cds_list_del(&wait_node->head); | |
f45e313d | 1583 | wait_queue.count--; |
d0b96690 DG |
1584 | app = wait_node->app; |
1585 | free(wait_node); | |
1586 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1587 | break; | |
1588 | } | |
1589 | } | |
020d7f60 DG |
1590 | |
1591 | /* | |
1592 | * With no application at this stage the received socket is | |
1593 | * basically useless so close it before we free the cmd data | |
1594 | * structure for good. | |
1595 | */ | |
1596 | if (!app) { | |
1597 | ret = close(ust_cmd->sock); | |
1598 | if (ret < 0) { | |
1599 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1600 | } | |
1601 | lttng_fd_put(1, LTTNG_FD_APPS); | |
1602 | } | |
7972aab2 | 1603 | free(ust_cmd); |
d0b96690 DG |
1604 | } |
1605 | ||
1606 | if (app) { | |
d0b96690 DG |
1607 | /* |
1608 | * @session_lock_list | |
1609 | * | |
1610 | * Lock the global session list so from the register up to the | |
1611 | * registration done message, no thread can see the application | |
1612 | * and change its state. | |
1613 | */ | |
1614 | session_lock_list(); | |
1615 | rcu_read_lock(); | |
d88aee68 | 1616 | |
d0b96690 DG |
1617 | /* |
1618 | * Add application to the global hash table. This needs to be | |
1619 | * done before the update to the UST registry can locate the | |
1620 | * application. | |
1621 | */ | |
1622 | ust_app_add(app); | |
d88aee68 DG |
1623 | |
1624 | /* Set app version. This call will print an error if needed. */ | |
1625 | (void) ust_app_version(app); | |
1626 | ||
1627 | /* Send notify socket through the notify pipe. */ | |
1628 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1629 | app->notify_sock); | |
1630 | if (ret < 0) { | |
1631 | rcu_read_unlock(); | |
1632 | session_unlock_list(); | |
1633 | /* No notify thread, stop the UST tracing. */ | |
1634 | goto error; | |
6620da75 | 1635 | } |
d88aee68 | 1636 | |
d0b96690 DG |
1637 | /* |
1638 | * Update newly registered application with the tracing | |
1639 | * registry info already enabled information. | |
1640 | */ | |
1641 | update_ust_app(app->sock); | |
d88aee68 DG |
1642 | |
1643 | /* | |
1644 | * Don't care about return value. Let the manage apps threads | |
1645 | * handle app unregistration upon socket close. | |
1646 | */ | |
1647 | (void) ust_app_register_done(app->sock); | |
1648 | ||
1649 | /* | |
1650 | * Even if the application socket has been closed, send the app | |
1651 | * to the thread and unregistration will take place at that | |
1652 | * place. | |
1653 | */ | |
1654 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1655 | if (ret < 0) { |
d88aee68 DG |
1656 | rcu_read_unlock(); |
1657 | session_unlock_list(); | |
1658 | /* No apps. thread, stop the UST tracing. */ | |
1659 | goto error; | |
d0b96690 | 1660 | } |
d88aee68 | 1661 | |
d0b96690 DG |
1662 | rcu_read_unlock(); |
1663 | session_unlock_list(); | |
099e26bd | 1664 | } |
099e26bd DG |
1665 | } while (node != NULL); |
1666 | ||
12e2b881 | 1667 | health_poll_entry(); |
099e26bd DG |
1668 | /* Futex wait on queue. Blocking call on futex() */ |
1669 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1670 | health_poll_exit(); |
099e26bd | 1671 | } |
12e2b881 MD |
1672 | /* Normal exit, no error */ |
1673 | err = 0; | |
099e26bd DG |
1674 | |
1675 | error: | |
d88aee68 DG |
1676 | /* Clean up wait queue. */ |
1677 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1678 | &wait_queue.head, head) { |
d88aee68 | 1679 | cds_list_del(&wait_node->head); |
f45e313d | 1680 | wait_queue.count--; |
d88aee68 DG |
1681 | free(wait_node); |
1682 | } | |
1683 | ||
099e26bd | 1684 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1685 | if (err) { |
1686 | health_error(); | |
1687 | ERR("Health error occurred in %s", __func__); | |
1688 | } | |
1689 | health_unregister(); | |
099e26bd DG |
1690 | return NULL; |
1691 | } | |
1692 | ||
1693 | /* | |
1694 | * This thread manage application registration. | |
1695 | */ | |
1696 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1697 | { |
139ac872 | 1698 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1699 | uint32_t revents, nb_fd; |
1700 | struct lttng_poll_event events; | |
099e26bd DG |
1701 | /* |
1702 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1703 | * freed in the manage apps thread. | |
1704 | */ | |
1705 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1706 | |
099e26bd | 1707 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1708 | |
927ca06a DG |
1709 | health_register(HEALTH_TYPE_APP_REG); |
1710 | ||
6993eeb3 CB |
1711 | if (testpoint(thread_registration_apps)) { |
1712 | goto error_testpoint; | |
1713 | } | |
8ac94142 | 1714 | |
1d4b027a DG |
1715 | ret = lttcomm_listen_unix_sock(apps_sock); |
1716 | if (ret < 0) { | |
76d7553f | 1717 | goto error_listen; |
1d4b027a DG |
1718 | } |
1719 | ||
5eb91c98 DG |
1720 | /* |
1721 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1722 | * more will be added to this poll set. | |
1723 | */ | |
d0b96690 | 1724 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1725 | if (ret < 0) { |
76d7553f | 1726 | goto error_create_poll; |
5eb91c98 | 1727 | } |
273ea72c | 1728 | |
5eb91c98 DG |
1729 | /* Add the application registration socket */ |
1730 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1731 | if (ret < 0) { | |
76d7553f | 1732 | goto error_poll_add; |
5eb91c98 | 1733 | } |
273ea72c | 1734 | |
1d4b027a | 1735 | /* Notify all applications to register */ |
0fdd1e2c DG |
1736 | ret = notify_ust_apps(1); |
1737 | if (ret < 0) { | |
1738 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1739 | "Execution continues but there might be problem for already\n" |
1740 | "running applications that wishes to register."); | |
0fdd1e2c | 1741 | } |
1d4b027a DG |
1742 | |
1743 | while (1) { | |
1744 | DBG("Accepting application registration"); | |
273ea72c DG |
1745 | |
1746 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1747 | restart: |
a78af745 | 1748 | health_poll_entry(); |
5eb91c98 | 1749 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1750 | health_poll_exit(); |
273ea72c | 1751 | if (ret < 0) { |
88f2b785 MD |
1752 | /* |
1753 | * Restart interrupted system call. | |
1754 | */ | |
1755 | if (errno == EINTR) { | |
1756 | goto restart; | |
1757 | } | |
273ea72c DG |
1758 | goto error; |
1759 | } | |
1760 | ||
0d9c5d77 DG |
1761 | nb_fd = ret; |
1762 | ||
5eb91c98 | 1763 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1764 | health_code_update(); |
139ac872 | 1765 | |
5eb91c98 DG |
1766 | /* Fetch once the poll data */ |
1767 | revents = LTTNG_POLL_GETEV(&events, i); | |
1768 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1769 | |
5eb91c98 | 1770 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1771 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1772 | if (ret) { |
139ac872 MD |
1773 | err = 0; |
1774 | goto exit; | |
90014c57 | 1775 | } |
1d4b027a | 1776 | |
5eb91c98 DG |
1777 | /* Event on the registration socket */ |
1778 | if (pollfd == apps_sock) { | |
1779 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1780 | ERR("Register apps socket poll error"); | |
1781 | goto error; | |
1782 | } else if (revents & LPOLLIN) { | |
1783 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1784 | if (sock < 0) { | |
1785 | goto error; | |
1786 | } | |
099e26bd | 1787 | |
b662582b DG |
1788 | /* |
1789 | * Set the CLOEXEC flag. Return code is useless because | |
1790 | * either way, the show must go on. | |
1791 | */ | |
1792 | (void) utils_set_fd_cloexec(sock); | |
1793 | ||
5eb91c98 | 1794 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1795 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1796 | if (ust_cmd == NULL) { |
76d7553f | 1797 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1798 | goto error; |
1799 | } | |
1d4b027a | 1800 | |
5eb91c98 DG |
1801 | /* |
1802 | * Using message-based transmissions to ensure we don't | |
1803 | * have to deal with partially received messages. | |
1804 | */ | |
4063050c MD |
1805 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1806 | if (ret < 0) { | |
1807 | ERR("Exhausted file descriptors allowed for applications."); | |
1808 | free(ust_cmd); | |
1809 | ret = close(sock); | |
1810 | if (ret) { | |
1811 | PERROR("close"); | |
1812 | } | |
1813 | sock = -1; | |
1814 | continue; | |
1815 | } | |
d88aee68 | 1816 | |
840cb59c | 1817 | health_code_update(); |
d0b96690 DG |
1818 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1819 | if (ret < 0) { | |
5eb91c98 | 1820 | free(ust_cmd); |
d0b96690 | 1821 | /* Close socket of the application. */ |
76d7553f MD |
1822 | ret = close(sock); |
1823 | if (ret) { | |
1824 | PERROR("close"); | |
1825 | } | |
4063050c | 1826 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1827 | sock = -1; |
5eb91c98 DG |
1828 | continue; |
1829 | } | |
840cb59c | 1830 | health_code_update(); |
099e26bd | 1831 | |
5eb91c98 | 1832 | ust_cmd->sock = sock; |
34a2494f | 1833 | sock = -1; |
099e26bd | 1834 | |
5eb91c98 DG |
1835 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1836 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1837 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1838 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1839 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1840 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1841 | |
5eb91c98 DG |
1842 | /* |
1843 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1844 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1845 | */ |
1846 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1847 | ||
1848 | /* | |
1849 | * Wake the registration queue futex. Implicit memory | |
1850 | * barrier with the exchange in cds_wfq_enqueue. | |
1851 | */ | |
1852 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1853 | } | |
1854 | } | |
90014c57 | 1855 | } |
1d4b027a DG |
1856 | } |
1857 | ||
139ac872 | 1858 | exit: |
1d4b027a | 1859 | error: |
139ac872 | 1860 | if (err) { |
840cb59c | 1861 | health_error(); |
139ac872 MD |
1862 | ERR("Health error occurred in %s", __func__); |
1863 | } | |
139ac872 | 1864 | |
0fdd1e2c DG |
1865 | /* Notify that the registration thread is gone */ |
1866 | notify_ust_apps(0); | |
1867 | ||
a4b35e07 | 1868 | if (apps_sock >= 0) { |
76d7553f MD |
1869 | ret = close(apps_sock); |
1870 | if (ret) { | |
1871 | PERROR("close"); | |
1872 | } | |
a4b35e07 | 1873 | } |
46c3f085 | 1874 | if (sock >= 0) { |
76d7553f MD |
1875 | ret = close(sock); |
1876 | if (ret) { | |
1877 | PERROR("close"); | |
1878 | } | |
4063050c | 1879 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1880 | } |
273ea72c | 1881 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1882 | |
76d7553f | 1883 | error_poll_add: |
5eb91c98 | 1884 | lttng_poll_clean(&events); |
76d7553f MD |
1885 | error_listen: |
1886 | error_create_poll: | |
6993eeb3 | 1887 | error_testpoint: |
76d7553f | 1888 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1889 | health_unregister(); |
5eb91c98 | 1890 | |
1d4b027a DG |
1891 | return NULL; |
1892 | } | |
1893 | ||
8c0faa1d | 1894 | /* |
3bd1e081 | 1895 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1896 | * exec or it will fails. |
8c0faa1d | 1897 | */ |
3bd1e081 | 1898 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1899 | { |
a23ec3a7 | 1900 | int ret, clock_ret; |
ee0b0061 DG |
1901 | struct timespec timeout; |
1902 | ||
a23ec3a7 DG |
1903 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1904 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1905 | |
a23ec3a7 DG |
1906 | /* Setup pthread condition */ |
1907 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1908 | if (ret != 0) { | |
1909 | errno = ret; | |
1910 | PERROR("pthread_condattr_init consumer data"); | |
1911 | goto error; | |
1912 | } | |
1913 | ||
1914 | /* | |
1915 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1916 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1917 | * for a more details and how we noticed it. | |
1918 | */ | |
1919 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1920 | if (ret != 0) { | |
1921 | errno = ret; | |
1922 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1923 | goto error; |
1924 | } | |
8c0faa1d | 1925 | |
a23ec3a7 DG |
1926 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1927 | if (ret != 0) { | |
1928 | errno = ret; | |
1929 | PERROR("pthread_cond_init consumer data"); | |
1930 | goto error; | |
1931 | } | |
1932 | ||
1933 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1934 | consumer_data); | |
8c0faa1d | 1935 | if (ret != 0) { |
3bd1e081 | 1936 | PERROR("pthread_create consumer"); |
ee0b0061 | 1937 | ret = -1; |
8c0faa1d DG |
1938 | goto error; |
1939 | } | |
1940 | ||
a23ec3a7 DG |
1941 | /* We are about to wait on a pthread condition */ |
1942 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1943 | ||
ee0b0061 | 1944 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1945 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1946 | /* | |
1947 | * Set the timeout for the condition timed wait even if the clock gettime | |
1948 | * call fails since we might loop on that call and we want to avoid to | |
1949 | * increment the timeout too many times. | |
1950 | */ | |
1951 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1952 | ||
1953 | /* | |
1954 | * The following loop COULD be skipped in some conditions so this is why we | |
1955 | * set ret to 0 in order to make sure at least one round of the loop is | |
1956 | * done. | |
1957 | */ | |
1958 | ret = 0; | |
1959 | ||
1960 | /* | |
1961 | * Loop until the condition is reached or when a timeout is reached. Note | |
1962 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1963 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1964 | * possible. This loop does not take any chances and works with both of | |
1965 | * them. | |
1966 | */ | |
1967 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1968 | if (clock_ret < 0) { | |
1969 | PERROR("clock_gettime spawn consumer"); | |
1970 | /* Infinite wait for the consumerd thread to be ready */ | |
1971 | ret = pthread_cond_wait(&consumer_data->cond, | |
1972 | &consumer_data->cond_mutex); | |
1973 | } else { | |
1974 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1975 | &consumer_data->cond_mutex, &timeout); | |
1976 | } | |
ee0b0061 | 1977 | } |
8c0faa1d | 1978 | |
a23ec3a7 DG |
1979 | /* Release the pthread condition */ |
1980 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1981 | ||
1982 | if (ret != 0) { | |
1983 | errno = ret; | |
1984 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1985 | /* |
1986 | * Call has timed out so we kill the kconsumerd_thread and return | |
1987 | * an error. | |
1988 | */ | |
a23ec3a7 DG |
1989 | ERR("Condition timed out. The consumer thread was never ready." |
1990 | " Killing it"); | |
3bd1e081 | 1991 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1992 | if (ret < 0) { |
3bd1e081 | 1993 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1994 | } |
1995 | } else { | |
a23ec3a7 | 1996 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1997 | } |
1998 | goto error; | |
1999 | } | |
2000 | ||
3bd1e081 MD |
2001 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2002 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2003 | ERR("Consumerd did not start"); |
3bd1e081 | 2004 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2005 | goto error; |
2006 | } | |
3bd1e081 | 2007 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2008 | |
8c0faa1d DG |
2009 | return 0; |
2010 | ||
2011 | error: | |
2012 | return ret; | |
2013 | } | |
2014 | ||
d9800920 | 2015 | /* |
3bd1e081 | 2016 | * Join consumer thread |
d9800920 | 2017 | */ |
3bd1e081 | 2018 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2019 | { |
2020 | void *status; | |
cf3af59e | 2021 | |
e8209f6b DG |
2022 | /* Consumer pid must be a real one. */ |
2023 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2024 | int ret; |
3bd1e081 | 2025 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2026 | if (ret) { |
3bd1e081 | 2027 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
2028 | return ret; |
2029 | } | |
3bd1e081 | 2030 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2031 | } else { |
2032 | return 0; | |
2033 | } | |
2034 | } | |
2035 | ||
8c0faa1d | 2036 | /* |
3bd1e081 | 2037 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2038 | * |
d063d709 | 2039 | * Return pid if successful else -1. |
8c0faa1d | 2040 | */ |
3bd1e081 | 2041 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2042 | { |
2043 | int ret; | |
2044 | pid_t pid; | |
94c55f17 | 2045 | const char *consumer_to_use; |
53086306 | 2046 | const char *verbosity; |
94c55f17 | 2047 | struct stat st; |
8c0faa1d | 2048 | |
3bd1e081 | 2049 | DBG("Spawning consumerd"); |
c49dc785 | 2050 | |
8c0faa1d DG |
2051 | pid = fork(); |
2052 | if (pid == 0) { | |
2053 | /* | |
3bd1e081 | 2054 | * Exec consumerd. |
8c0faa1d | 2055 | */ |
daee5345 | 2056 | if (opt_verbose_consumer) { |
53086306 DG |
2057 | verbosity = "--verbose"; |
2058 | } else { | |
2059 | verbosity = "--quiet"; | |
2060 | } | |
3bd1e081 MD |
2061 | switch (consumer_data->type) { |
2062 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2063 | /* |
c7704d57 DG |
2064 | * Find out which consumerd to execute. We will first try the |
2065 | * 64-bit path, then the sessiond's installation directory, and | |
2066 | * fallback on the 32-bit one, | |
94c55f17 | 2067 | */ |
63a799e8 AM |
2068 | DBG3("Looking for a kernel consumer at these locations:"); |
2069 | DBG3(" 1) %s", consumerd64_bin); | |
2070 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2071 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2072 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2073 | DBG3("Found location #1"); |
94c55f17 | 2074 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2075 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2076 | DBG3("Found location #2"); |
94c55f17 | 2077 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2078 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2079 | DBG3("Found location #3"); |
eb1e0bd4 | 2080 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2081 | } else { |
63a799e8 | 2082 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
2083 | break; |
2084 | } | |
2085 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
2086 | execl(consumer_to_use, | |
2087 | "lttng-consumerd", verbosity, "-k", | |
2088 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2089 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2090 | NULL); | |
3bd1e081 | 2091 | break; |
7753dea8 MD |
2092 | case LTTNG_CONSUMER64_UST: |
2093 | { | |
b1e0b6b6 | 2094 | char *tmpnew = NULL; |
8f4905da MD |
2095 | |
2096 | if (consumerd64_libdir[0] != '\0') { | |
2097 | char *tmp; | |
2098 | size_t tmplen; | |
2099 | ||
2100 | tmp = getenv("LD_LIBRARY_PATH"); | |
2101 | if (!tmp) { | |
2102 | tmp = ""; | |
2103 | } | |
2104 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2105 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2106 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2107 | if (!tmpnew) { | |
2108 | ret = -ENOMEM; | |
2109 | goto error; | |
2110 | } | |
2111 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2112 | strcat(tmpnew, consumerd64_libdir); | |
2113 | if (tmp[0] != '\0') { | |
2114 | strcat(tmpnew, ":"); | |
2115 | strcat(tmpnew, tmp); | |
2116 | } | |
2117 | ret = putenv(tmpnew); | |
2118 | if (ret) { | |
2119 | ret = -errno; | |
c6f76da9 | 2120 | free(tmpnew); |
8f4905da MD |
2121 | goto error; |
2122 | } | |
2123 | } | |
94c55f17 | 2124 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2125 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2126 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2127 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2128 | NULL); | |
8f4905da MD |
2129 | if (consumerd64_libdir[0] != '\0') { |
2130 | free(tmpnew); | |
2131 | } | |
2132 | if (ret) { | |
2133 | goto error; | |
2134 | } | |
3bd1e081 | 2135 | break; |
7753dea8 MD |
2136 | } |
2137 | case LTTNG_CONSUMER32_UST: | |
2138 | { | |
937dde8e | 2139 | char *tmpnew = NULL; |
8f4905da MD |
2140 | |
2141 | if (consumerd32_libdir[0] != '\0') { | |
2142 | char *tmp; | |
2143 | size_t tmplen; | |
2144 | ||
2145 | tmp = getenv("LD_LIBRARY_PATH"); | |
2146 | if (!tmp) { | |
2147 | tmp = ""; | |
2148 | } | |
2149 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2150 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2151 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2152 | if (!tmpnew) { | |
2153 | ret = -ENOMEM; | |
2154 | goto error; | |
2155 | } | |
2156 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2157 | strcat(tmpnew, consumerd32_libdir); | |
2158 | if (tmp[0] != '\0') { | |
2159 | strcat(tmpnew, ":"); | |
2160 | strcat(tmpnew, tmp); | |
2161 | } | |
2162 | ret = putenv(tmpnew); | |
2163 | if (ret) { | |
2164 | ret = -errno; | |
c6f76da9 | 2165 | free(tmpnew); |
8f4905da MD |
2166 | goto error; |
2167 | } | |
2168 | } | |
94c55f17 | 2169 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2170 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2171 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2172 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2173 | NULL); | |
8f4905da MD |
2174 | if (consumerd32_libdir[0] != '\0') { |
2175 | free(tmpnew); | |
2176 | } | |
2177 | if (ret) { | |
2178 | goto error; | |
2179 | } | |
7753dea8 MD |
2180 | break; |
2181 | } | |
3bd1e081 | 2182 | default: |
76d7553f | 2183 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2184 | exit(EXIT_FAILURE); |
2185 | } | |
8c0faa1d | 2186 | if (errno != 0) { |
76d7553f | 2187 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
2188 | } |
2189 | exit(EXIT_FAILURE); | |
2190 | } else if (pid > 0) { | |
2191 | ret = pid; | |
8c0faa1d | 2192 | } else { |
76d7553f | 2193 | PERROR("start consumer fork"); |
8c0faa1d | 2194 | ret = -errno; |
8c0faa1d | 2195 | } |
8f4905da | 2196 | error: |
8c0faa1d DG |
2197 | return ret; |
2198 | } | |
2199 | ||
693bd40b | 2200 | /* |
3bd1e081 | 2201 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2202 | */ |
3bd1e081 | 2203 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2204 | { |
c617c0c6 | 2205 | int ret; |
edb8b045 DG |
2206 | |
2207 | /* | |
2208 | * Set the listen() state on the socket since there is a possible race | |
2209 | * between the exec() of the consumer daemon and this call if place in the | |
2210 | * consumer thread. See bug #366 for more details. | |
2211 | */ | |
2212 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2213 | if (ret < 0) { | |
2214 | goto error; | |
2215 | } | |
693bd40b | 2216 | |
3bd1e081 MD |
2217 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2218 | if (consumer_data->pid != 0) { | |
2219 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2220 | goto end; |
2221 | } | |
693bd40b | 2222 | |
3bd1e081 | 2223 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2224 | if (ret < 0) { |
3bd1e081 MD |
2225 | ERR("Spawning consumerd failed"); |
2226 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2227 | goto error; |
693bd40b | 2228 | } |
c49dc785 | 2229 | |
3bd1e081 MD |
2230 | /* Setting up the consumer_data pid */ |
2231 | consumer_data->pid = ret; | |
48842b30 | 2232 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2233 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2234 | |
3bd1e081 MD |
2235 | DBG2("Spawning consumer control thread"); |
2236 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2237 | if (ret < 0) { |
3bd1e081 | 2238 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2239 | goto error; |
2240 | } | |
2241 | ||
c49dc785 | 2242 | end: |
693bd40b DG |
2243 | return 0; |
2244 | ||
2245 | error: | |
331744e3 | 2246 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2247 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2248 | int err; |
2249 | ||
edb8b045 DG |
2250 | err = close(consumer_data->err_sock); |
2251 | if (err < 0) { | |
2252 | PERROR("close consumer data error socket"); | |
2253 | } | |
2254 | } | |
693bd40b DG |
2255 | return ret; |
2256 | } | |
2257 | ||
44a5e5eb | 2258 | /* |
139ac872 MD |
2259 | * Compute health status of each consumer. If one of them is zero (bad |
2260 | * state), we return 0. | |
44a5e5eb DG |
2261 | */ |
2262 | static int check_consumer_health(void) | |
2263 | { | |
2264 | int ret; | |
2265 | ||
927ca06a | 2266 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
2267 | |
2268 | DBG3("Health consumer check %d", ret); | |
2269 | ||
2270 | return ret; | |
2271 | } | |
2272 | ||
b73401da | 2273 | /* |
096102bd | 2274 | * Setup necessary data for kernel tracer action. |
b73401da | 2275 | */ |
096102bd | 2276 | static int init_kernel_tracer(void) |
b73401da DG |
2277 | { |
2278 | int ret; | |
b73401da | 2279 | |
096102bd DG |
2280 | /* Modprobe lttng kernel modules */ |
2281 | ret = modprobe_lttng_control(); | |
b73401da | 2282 | if (ret < 0) { |
b73401da DG |
2283 | goto error; |
2284 | } | |
2285 | ||
096102bd DG |
2286 | /* Open debugfs lttng */ |
2287 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2288 | if (kernel_tracer_fd < 0) { | |
2289 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2290 | ret = -1; |
2291 | goto error_open; | |
54d01ffb DG |
2292 | } |
2293 | ||
2f77fc4b DG |
2294 | /* Validate kernel version */ |
2295 | ret = kernel_validate_version(kernel_tracer_fd); | |
2296 | if (ret < 0) { | |
2297 | goto error_version; | |
b551a063 | 2298 | } |
54d01ffb | 2299 | |
2f77fc4b DG |
2300 | ret = modprobe_lttng_data(); |
2301 | if (ret < 0) { | |
2302 | goto error_modules; | |
54d01ffb DG |
2303 | } |
2304 | ||
2f77fc4b DG |
2305 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2306 | return 0; | |
2307 | ||
2308 | error_version: | |
2309 | modprobe_remove_lttng_control(); | |
2310 | ret = close(kernel_tracer_fd); | |
2311 | if (ret) { | |
2312 | PERROR("close"); | |
b551a063 | 2313 | } |
2f77fc4b | 2314 | kernel_tracer_fd = -1; |
f73fabfd | 2315 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2316 | |
2f77fc4b DG |
2317 | error_modules: |
2318 | ret = close(kernel_tracer_fd); | |
2319 | if (ret) { | |
2320 | PERROR("close"); | |
b551a063 | 2321 | } |
54d01ffb | 2322 | |
2f77fc4b DG |
2323 | error_open: |
2324 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2325 | |
2326 | error: | |
2f77fc4b DG |
2327 | WARN("No kernel tracer available"); |
2328 | kernel_tracer_fd = -1; | |
2329 | if (!is_root) { | |
f73fabfd | 2330 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2331 | } else { |
f73fabfd | 2332 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2333 | } |
54d01ffb DG |
2334 | } |
2335 | ||
2f77fc4b | 2336 | |
54d01ffb | 2337 | /* |
2f77fc4b DG |
2338 | * Copy consumer output from the tracing session to the domain session. The |
2339 | * function also applies the right modification on a per domain basis for the | |
2340 | * trace files destination directory. | |
36b588ed MD |
2341 | * |
2342 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2343 | */ |
2f77fc4b | 2344 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2345 | { |
2346 | int ret; | |
2f77fc4b DG |
2347 | const char *dir_name; |
2348 | struct consumer_output *consumer; | |
2349 | ||
2350 | assert(session); | |
2351 | assert(session->consumer); | |
54d01ffb | 2352 | |
b551a063 DG |
2353 | switch (domain) { |
2354 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2355 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2356 | /* |
2357 | * XXX: We should audit the session creation and what this function | |
2358 | * does "extra" in order to avoid a destroy since this function is used | |
2359 | * in the domain session creation (kernel and ust) only. Same for UST | |
2360 | * domain. | |
2361 | */ | |
2362 | if (session->kernel_session->consumer) { | |
2363 | consumer_destroy_output(session->kernel_session->consumer); | |
2364 | } | |
2f77fc4b DG |
2365 | session->kernel_session->consumer = |
2366 | consumer_copy_output(session->consumer); | |
2367 | /* Ease our life a bit for the next part */ | |
2368 | consumer = session->kernel_session->consumer; | |
2369 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2370 | break; |
2371 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2372 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2373 | if (session->ust_session->consumer) { |
2374 | consumer_destroy_output(session->ust_session->consumer); | |
2375 | } | |
2f77fc4b DG |
2376 | session->ust_session->consumer = |
2377 | consumer_copy_output(session->consumer); | |
2378 | /* Ease our life a bit for the next part */ | |
2379 | consumer = session->ust_session->consumer; | |
2380 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2381 | break; |
2382 | default: | |
f73fabfd | 2383 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2384 | goto error; |
2385 | } | |
2386 | ||
2f77fc4b | 2387 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2388 | strncat(consumer->subdir, dir_name, |
2389 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2390 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2391 | ||
f73fabfd | 2392 | ret = LTTNG_OK; |
54d01ffb DG |
2393 | |
2394 | error: | |
2395 | return ret; | |
2396 | } | |
2397 | ||
00e2e675 | 2398 | /* |
2f77fc4b | 2399 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2400 | * |
2401 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2402 | */ |
2f77fc4b DG |
2403 | static int create_ust_session(struct ltt_session *session, |
2404 | struct lttng_domain *domain) | |
00e2e675 DG |
2405 | { |
2406 | int ret; | |
2f77fc4b | 2407 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2408 | |
a4b92340 | 2409 | assert(session); |
2f77fc4b DG |
2410 | assert(domain); |
2411 | assert(session->consumer); | |
a4b92340 | 2412 | |
2f77fc4b DG |
2413 | switch (domain->type) { |
2414 | case LTTNG_DOMAIN_UST: | |
2415 | break; | |
2416 | default: | |
2417 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2418 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2419 | goto error; |
2420 | } | |
2421 | ||
2f77fc4b DG |
2422 | DBG("Creating UST session"); |
2423 | ||
dec56f6c | 2424 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2425 | if (lus == NULL) { |
f73fabfd | 2426 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2427 | goto error; |
2428 | } | |
2429 | ||
2f77fc4b DG |
2430 | lus->uid = session->uid; |
2431 | lus->gid = session->gid; | |
2bba9e53 | 2432 | lus->output_traces = session->output_traces; |
27babd3a | 2433 | lus->snapshot_mode = session->snapshot_mode; |
2f77fc4b | 2434 | session->ust_session = lus; |
00e2e675 | 2435 | |
2f77fc4b DG |
2436 | /* Copy session output to the newly created UST session */ |
2437 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2438 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2439 | goto error; |
2440 | } | |
2441 | ||
f73fabfd | 2442 | return LTTNG_OK; |
00e2e675 DG |
2443 | |
2444 | error: | |
2f77fc4b DG |
2445 | free(lus); |
2446 | session->ust_session = NULL; | |
00e2e675 DG |
2447 | return ret; |
2448 | } | |
2449 | ||
2450 | /* | |
2f77fc4b | 2451 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2452 | */ |
2f77fc4b | 2453 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2454 | { |
2455 | int ret; | |
a4b92340 | 2456 | |
2f77fc4b | 2457 | DBG("Creating kernel session"); |
00e2e675 | 2458 | |
2f77fc4b DG |
2459 | ret = kernel_create_session(session, kernel_tracer_fd); |
2460 | if (ret < 0) { | |
f73fabfd | 2461 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2462 | goto error; |
2463 | } | |
2464 | ||
2f77fc4b DG |
2465 | /* Code flow safety */ |
2466 | assert(session->kernel_session); | |
2467 | ||
2468 | /* Copy session output to the newly created Kernel session */ | |
2469 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2470 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2471 | goto error; |
2472 | } | |
2473 | ||
2f77fc4b DG |
2474 | /* Create directory(ies) on local filesystem. */ |
2475 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2476 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2477 | ret = run_as_mkdir_recursive( | |
2478 | session->kernel_session->consumer->dst.trace_path, | |
2479 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2480 | if (ret < 0) { | |
2481 | if (ret != -EEXIST) { | |
2482 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2483 | goto error; |
2484 | } | |
00e2e675 | 2485 | } |
2f77fc4b | 2486 | } |
00e2e675 | 2487 | |
2f77fc4b DG |
2488 | session->kernel_session->uid = session->uid; |
2489 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2490 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2491 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2492 | |
f73fabfd | 2493 | return LTTNG_OK; |
00e2e675 | 2494 | |
2f77fc4b DG |
2495 | error: |
2496 | trace_kernel_destroy_session(session->kernel_session); | |
2497 | session->kernel_session = NULL; | |
2498 | return ret; | |
2499 | } | |
00e2e675 | 2500 | |
2f77fc4b DG |
2501 | /* |
2502 | * Count number of session permitted by uid/gid. | |
2503 | */ | |
2504 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2505 | { | |
2506 | unsigned int i = 0; | |
2507 | struct ltt_session *session; | |
07424f16 | 2508 | |
2f77fc4b DG |
2509 | DBG("Counting number of available session for UID %d GID %d", |
2510 | uid, gid); | |
2511 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2512 | /* |
2f77fc4b | 2513 | * Only list the sessions the user can control. |
00e2e675 | 2514 | */ |
2f77fc4b DG |
2515 | if (!session_access_ok(session, uid, gid)) { |
2516 | continue; | |
2517 | } | |
2518 | i++; | |
a4b92340 | 2519 | } |
2f77fc4b | 2520 | return i; |
00e2e675 DG |
2521 | } |
2522 | ||
54d01ffb DG |
2523 | /* |
2524 | * Process the command requested by the lttng client within the command | |
2525 | * context structure. This function make sure that the return structure (llm) | |
2526 | * is set and ready for transmission before returning. | |
2527 | * | |
2528 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2529 | * |
2530 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2531 | * |
2532 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2533 | */ |
53a80697 MD |
2534 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2535 | int *sock_error) | |
54d01ffb | 2536 | { |
f73fabfd | 2537 | int ret = LTTNG_OK; |
44d3bd01 | 2538 | int need_tracing_session = 1; |
2e09ba09 | 2539 | int need_domain; |
54d01ffb DG |
2540 | |
2541 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2542 | ||
53a80697 MD |
2543 | *sock_error = 0; |
2544 | ||
2e09ba09 MD |
2545 | switch (cmd_ctx->lsm->cmd_type) { |
2546 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2547 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
2e09ba09 MD |
2548 | case LTTNG_DESTROY_SESSION: |
2549 | case LTTNG_LIST_SESSIONS: | |
2550 | case LTTNG_LIST_DOMAINS: | |
2551 | case LTTNG_START_TRACE: | |
2552 | case LTTNG_STOP_TRACE: | |
6d805429 | 2553 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2554 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2555 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2556 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2557 | case LTTNG_SNAPSHOT_RECORD: | |
2e09ba09 | 2558 | need_domain = 0; |
3aace903 | 2559 | break; |
2e09ba09 MD |
2560 | default: |
2561 | need_domain = 1; | |
2562 | } | |
2563 | ||
2564 | if (opt_no_kernel && need_domain | |
2565 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2566 | if (!is_root) { |
f73fabfd | 2567 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2568 | } else { |
f73fabfd | 2569 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2570 | } |
4fba7219 DG |
2571 | goto error; |
2572 | } | |
2573 | ||
8d3113b2 DG |
2574 | /* Deny register consumer if we already have a spawned consumer. */ |
2575 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2576 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2577 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2578 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2579 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2580 | goto error; |
2581 | } | |
2582 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2583 | } | |
2584 | ||
54d01ffb DG |
2585 | /* |
2586 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2587 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2588 | * command. |
2589 | */ | |
2590 | switch(cmd_ctx->lsm->cmd_type) { | |
2591 | case LTTNG_LIST_SESSIONS: | |
2592 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2593 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2594 | case LTTNG_LIST_DOMAINS: |
2595 | case LTTNG_LIST_CHANNELS: | |
2596 | case LTTNG_LIST_EVENTS: | |
2597 | break; | |
2598 | default: | |
2599 | /* Setup lttng message with no payload */ | |
2600 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2601 | if (ret < 0) { | |
2602 | /* This label does not try to unlock the session */ | |
2603 | goto init_setup_error; | |
2604 | } | |
2605 | } | |
2606 | ||
2607 | /* Commands that DO NOT need a session. */ | |
2608 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2609 | case LTTNG_CREATE_SESSION: |
27babd3a | 2610 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
2e09ba09 | 2611 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2612 | case LTTNG_LIST_SESSIONS: |
2613 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2614 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2615 | need_tracing_session = 0; |
54d01ffb DG |
2616 | break; |
2617 | default: | |
2618 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2619 | /* |
2620 | * We keep the session list lock across _all_ commands | |
2621 | * for now, because the per-session lock does not | |
2622 | * handle teardown properly. | |
2623 | */ | |
74babd95 | 2624 | session_lock_list(); |
54d01ffb DG |
2625 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2626 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2627 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2628 | goto error; |
2629 | } else { | |
2630 | /* Acquire lock for the session */ | |
2631 | session_lock(cmd_ctx->session); | |
2632 | } | |
2633 | break; | |
2634 | } | |
b389abbe | 2635 | |
2e09ba09 MD |
2636 | if (!need_domain) { |
2637 | goto skip_domain; | |
2638 | } | |
a4b92340 | 2639 | |
54d01ffb DG |
2640 | /* |
2641 | * Check domain type for specific "pre-action". | |
2642 | */ | |
2643 | switch (cmd_ctx->lsm->domain.type) { | |
2644 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2645 | if (!is_root) { |
f73fabfd | 2646 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2647 | goto error; |
2648 | } | |
2649 | ||
54d01ffb | 2650 | /* Kernel tracer check */ |
a4b35e07 | 2651 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2652 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2653 | ret = init_kernel_tracer(); |
2654 | if (ret != 0) { | |
54d01ffb DG |
2655 | goto error; |
2656 | } | |
2657 | } | |
5eb91c98 | 2658 | |
5c827ce0 DG |
2659 | /* Consumer is in an ERROR state. Report back to client */ |
2660 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2661 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2662 | goto error; |
2663 | } | |
2664 | ||
54d01ffb | 2665 | /* Need a session for kernel command */ |
44d3bd01 | 2666 | if (need_tracing_session) { |
54d01ffb | 2667 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2668 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2669 | if (ret < 0) { |
f73fabfd | 2670 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2671 | goto error; |
2672 | } | |
b389abbe | 2673 | } |
7d29a247 | 2674 | |
54d01ffb | 2675 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2676 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2677 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2678 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2679 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2680 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2681 | if (ret < 0) { |
f73fabfd | 2682 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2683 | goto error; |
950131af | 2684 | } |
5c827ce0 | 2685 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2686 | } else { |
2687 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2688 | } |
173af62f | 2689 | |
a4b92340 DG |
2690 | /* |
2691 | * The consumer was just spawned so we need to add the socket to | |
2692 | * the consumer output of the session if exist. | |
2693 | */ | |
2694 | ret = consumer_create_socket(&kconsumer_data, | |
2695 | cmd_ctx->session->kernel_session->consumer); | |
2696 | if (ret < 0) { | |
2697 | goto error; | |
173af62f | 2698 | } |
0d0c377a | 2699 | } |
5c827ce0 | 2700 | |
54d01ffb | 2701 | break; |
2bdd86d4 | 2702 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2703 | { |
5c827ce0 DG |
2704 | /* Consumer is in an ERROR state. Report back to client */ |
2705 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2706 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2707 | goto error; |
2708 | } | |
2709 | ||
44d3bd01 | 2710 | if (need_tracing_session) { |
a4b92340 | 2711 | /* Create UST session if none exist. */ |
f6a9efaa | 2712 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2713 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2714 | &cmd_ctx->lsm->domain); |
f73fabfd | 2715 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2716 | goto error; |
2717 | } | |
2718 | } | |
00e2e675 | 2719 | |
7753dea8 MD |
2720 | /* Start the UST consumer daemons */ |
2721 | /* 64-bit */ | |
2722 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2723 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2724 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2725 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2726 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2727 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2728 | if (ret < 0) { |
f73fabfd | 2729 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2730 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2731 | goto error; |
2732 | } | |
48842b30 | 2733 | |
173af62f | 2734 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2735 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2736 | } else { |
7753dea8 MD |
2737 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2738 | } | |
173af62f DG |
2739 | |
2740 | /* | |
2741 | * Setup socket for consumer 64 bit. No need for atomic access | |
2742 | * since it was set above and can ONLY be set in this thread. | |
2743 | */ | |
a4b92340 DG |
2744 | ret = consumer_create_socket(&ustconsumer64_data, |
2745 | cmd_ctx->session->ust_session->consumer); | |
2746 | if (ret < 0) { | |
2747 | goto error; | |
173af62f DG |
2748 | } |
2749 | ||
7753dea8 | 2750 | /* 32-bit */ |
fc7a59ce | 2751 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2752 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2753 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2754 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2755 | ret = start_consumerd(&ustconsumer32_data); | |
2756 | if (ret < 0) { | |
f73fabfd | 2757 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2758 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2759 | goto error; |
2760 | } | |
5c827ce0 | 2761 | |
173af62f | 2762 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2763 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2764 | } else { |
2765 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2766 | } |
173af62f DG |
2767 | |
2768 | /* | |
2769 | * Setup socket for consumer 64 bit. No need for atomic access | |
2770 | * since it was set above and can ONLY be set in this thread. | |
2771 | */ | |
a4b92340 DG |
2772 | ret = consumer_create_socket(&ustconsumer32_data, |
2773 | cmd_ctx->session->ust_session->consumer); | |
2774 | if (ret < 0) { | |
2775 | goto error; | |
173af62f | 2776 | } |
44d3bd01 DG |
2777 | } |
2778 | break; | |
48842b30 | 2779 | } |
54d01ffb | 2780 | default: |
54d01ffb DG |
2781 | break; |
2782 | } | |
2e09ba09 | 2783 | skip_domain: |
33a2b854 | 2784 | |
5c827ce0 DG |
2785 | /* Validate consumer daemon state when start/stop trace command */ |
2786 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2787 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2788 | switch (cmd_ctx->lsm->domain.type) { | |
2789 | case LTTNG_DOMAIN_UST: | |
2790 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2791 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2792 | goto error; |
2793 | } | |
2794 | break; | |
2795 | case LTTNG_DOMAIN_KERNEL: | |
2796 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2797 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2798 | goto error; |
2799 | } | |
2800 | break; | |
2801 | } | |
2802 | } | |
2803 | ||
8e0af1b4 MD |
2804 | /* |
2805 | * Check that the UID or GID match that of the tracing session. | |
2806 | * The root user can interact with all sessions. | |
2807 | */ | |
2808 | if (need_tracing_session) { | |
2809 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2810 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2811 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2812 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2813 | goto error; |
2814 | } | |
2815 | } | |
2816 | ||
ffe60014 DG |
2817 | /* |
2818 | * Send relayd information to consumer as soon as we have a domain and a | |
2819 | * session defined. | |
2820 | */ | |
2821 | if (cmd_ctx->session && need_domain) { | |
2822 | /* | |
2823 | * Setup relayd if not done yet. If the relayd information was already | |
2824 | * sent to the consumer, this call will gracefully return. | |
2825 | */ | |
2826 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2827 | if (ret != LTTNG_OK) { | |
2828 | goto error; | |
2829 | } | |
2830 | } | |
2831 | ||
54d01ffb DG |
2832 | /* Process by command type */ |
2833 | switch (cmd_ctx->lsm->cmd_type) { | |
2834 | case LTTNG_ADD_CONTEXT: | |
2835 | { | |
2836 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2837 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2838 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2839 | break; |
2840 | } | |
2841 | case LTTNG_DISABLE_CHANNEL: | |
2842 | { | |
2843 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2844 | cmd_ctx->lsm->u.disable.channel_name); | |
2845 | break; | |
2846 | } | |
2847 | case LTTNG_DISABLE_EVENT: | |
2848 | { | |
2849 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2850 | cmd_ctx->lsm->u.disable.channel_name, | |
2851 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2852 | break; |
2853 | } | |
54d01ffb DG |
2854 | case LTTNG_DISABLE_ALL_EVENT: |
2855 | { | |
2bdd86d4 | 2856 | DBG("Disabling all events"); |
54d01ffb DG |
2857 | |
2858 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2859 | cmd_ctx->lsm->u.disable.channel_name); | |
2860 | break; | |
2861 | } | |
2862 | case LTTNG_ENABLE_CHANNEL: | |
2863 | { | |
7972aab2 | 2864 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 2865 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2866 | break; |
2867 | } | |
2868 | case LTTNG_ENABLE_EVENT: | |
2869 | { | |
7972aab2 | 2870 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb | 2871 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2872 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2873 | break; |
2874 | } | |
2875 | case LTTNG_ENABLE_ALL_EVENT: | |
2876 | { | |
2bdd86d4 | 2877 | DBG("Enabling all events"); |
54d01ffb | 2878 | |
7972aab2 | 2879 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 2880 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2881 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2882 | break; |
2883 | } | |
052da939 | 2884 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2885 | { |
9f19cc17 | 2886 | struct lttng_event *events; |
54d01ffb | 2887 | ssize_t nb_events; |
052da939 | 2888 | |
54d01ffb DG |
2889 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2890 | if (nb_events < 0) { | |
f73fabfd | 2891 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2892 | ret = -nb_events; |
2893 | goto error; | |
2ef84c95 DG |
2894 | } |
2895 | ||
2896 | /* | |
2897 | * Setup lttng message with payload size set to the event list size in | |
2898 | * bytes and then copy list into the llm payload. | |
2899 | */ | |
052da939 | 2900 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2901 | if (ret < 0) { |
052da939 | 2902 | free(events); |
2ef84c95 DG |
2903 | goto setup_error; |
2904 | } | |
2905 | ||
2906 | /* Copy event list into message payload */ | |
9f19cc17 | 2907 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2908 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2909 | |
9f19cc17 | 2910 | free(events); |
2ef84c95 | 2911 | |
f73fabfd | 2912 | ret = LTTNG_OK; |
2ef84c95 DG |
2913 | break; |
2914 | } | |
f37d259d MD |
2915 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2916 | { | |
2917 | struct lttng_event_field *fields; | |
2918 | ssize_t nb_fields; | |
2919 | ||
a4b92340 DG |
2920 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2921 | &fields); | |
f37d259d | 2922 | if (nb_fields < 0) { |
f73fabfd | 2923 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2924 | ret = -nb_fields; |
2925 | goto error; | |
2926 | } | |
2927 | ||
2928 | /* | |
2929 | * Setup lttng message with payload size set to the event list size in | |
2930 | * bytes and then copy list into the llm payload. | |
2931 | */ | |
a4b92340 DG |
2932 | ret = setup_lttng_msg(cmd_ctx, |
2933 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2934 | if (ret < 0) { |
2935 | free(fields); | |
2936 | goto setup_error; | |
2937 | } | |
2938 | ||
2939 | /* Copy event list into message payload */ | |
2940 | memcpy(cmd_ctx->llm->payload, fields, | |
2941 | sizeof(struct lttng_event_field) * nb_fields); | |
2942 | ||
2943 | free(fields); | |
2944 | ||
f73fabfd | 2945 | ret = LTTNG_OK; |
f37d259d MD |
2946 | break; |
2947 | } | |
00e2e675 DG |
2948 | case LTTNG_SET_CONSUMER_URI: |
2949 | { | |
a4b92340 DG |
2950 | size_t nb_uri, len; |
2951 | struct lttng_uri *uris; | |
2952 | ||
2953 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2954 | len = nb_uri * sizeof(struct lttng_uri); | |
2955 | ||
2956 | if (nb_uri == 0) { | |
f73fabfd | 2957 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2958 | goto error; |
2959 | } | |
2960 | ||
2961 | uris = zmalloc(len); | |
2962 | if (uris == NULL) { | |
f73fabfd | 2963 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2964 | goto error; |
2965 | } | |
2966 | ||
2967 | /* Receive variable len data */ | |
77c7c900 | 2968 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2969 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2970 | if (ret <= 0) { | |
2971 | DBG("No URIs received from client... continuing"); | |
2972 | *sock_error = 1; | |
f73fabfd | 2973 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2974 | free(uris); |
a4b92340 DG |
2975 | goto error; |
2976 | } | |
2977 | ||
00e2e675 | 2978 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2979 | nb_uri, uris); |
f73fabfd | 2980 | if (ret != LTTNG_OK) { |
b1d41407 | 2981 | free(uris); |
a4b92340 DG |
2982 | goto error; |
2983 | } | |
2984 | ||
2985 | /* | |
2986 | * XXX: 0 means that this URI should be applied on the session. Should | |
2987 | * be a DOMAIN enuam. | |
2988 | */ | |
2989 | if (cmd_ctx->lsm->domain.type == 0) { | |
2990 | /* Add the URI for the UST session if a consumer is present. */ | |
2991 | if (cmd_ctx->session->ust_session && | |
2992 | cmd_ctx->session->ust_session->consumer) { | |
2993 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2994 | nb_uri, uris); | |
2995 | } else if (cmd_ctx->session->kernel_session && | |
2996 | cmd_ctx->session->kernel_session->consumer) { | |
2997 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2998 | cmd_ctx->session, nb_uri, uris); | |
2999 | } | |
3000 | } | |
3001 | ||
b1d41407 DG |
3002 | free(uris); |
3003 | ||
00e2e675 DG |
3004 | break; |
3005 | } | |
f3ed775e | 3006 | case LTTNG_START_TRACE: |
8c0faa1d | 3007 | { |
54d01ffb | 3008 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3009 | break; |
3010 | } | |
f3ed775e | 3011 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3012 | { |
54d01ffb | 3013 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3014 | break; |
3015 | } | |
5e16da05 MD |
3016 | case LTTNG_CREATE_SESSION: |
3017 | { | |
a4b92340 DG |
3018 | size_t nb_uri, len; |
3019 | struct lttng_uri *uris = NULL; | |
3020 | ||
3021 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3022 | len = nb_uri * sizeof(struct lttng_uri); | |
3023 | ||
3024 | if (nb_uri > 0) { | |
3025 | uris = zmalloc(len); | |
3026 | if (uris == NULL) { | |
f73fabfd | 3027 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3028 | goto error; |
3029 | } | |
3030 | ||
3031 | /* Receive variable len data */ | |
77c7c900 | 3032 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3033 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3034 | if (ret <= 0) { | |
3035 | DBG("No URIs received from client... continuing"); | |
3036 | *sock_error = 1; | |
f73fabfd | 3037 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3038 | free(uris); |
a4b92340 DG |
3039 | goto error; |
3040 | } | |
3041 | ||
3042 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3043 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3044 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3045 | free(uris); |
a4b92340 DG |
3046 | goto error; |
3047 | } | |
3048 | } | |
3049 | ||
3050 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
3051 | &cmd_ctx->creds); | |
3052 | ||
b1d41407 DG |
3053 | free(uris); |
3054 | ||
00e2e675 DG |
3055 | break; |
3056 | } | |
5e16da05 MD |
3057 | case LTTNG_DESTROY_SESSION: |
3058 | { | |
2f77fc4b | 3059 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3060 | |
3061 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3062 | cmd_ctx->session = NULL; |
5461b305 | 3063 | break; |
5e16da05 | 3064 | } |
9f19cc17 | 3065 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3066 | { |
54d01ffb DG |
3067 | ssize_t nb_dom; |
3068 | struct lttng_domain *domains; | |
5461b305 | 3069 | |
54d01ffb DG |
3070 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3071 | if (nb_dom < 0) { | |
f73fabfd | 3072 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3073 | ret = -nb_dom; |
3074 | goto error; | |
ce3d728c | 3075 | } |
520ff687 | 3076 | |
54d01ffb | 3077 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3078 | if (ret < 0) { |
ae9c20bc | 3079 | free(domains); |
5461b305 | 3080 | goto setup_error; |
520ff687 | 3081 | } |
57167058 | 3082 | |
54d01ffb DG |
3083 | /* Copy event list into message payload */ |
3084 | memcpy(cmd_ctx->llm->payload, domains, | |
3085 | nb_dom * sizeof(struct lttng_domain)); | |
3086 | ||
3087 | free(domains); | |
5e16da05 | 3088 | |
f73fabfd | 3089 | ret = LTTNG_OK; |
5e16da05 MD |
3090 | break; |
3091 | } | |
9f19cc17 | 3092 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3093 | { |
6775595e | 3094 | int nb_chan; |
54d01ffb DG |
3095 | struct lttng_channel *channels; |
3096 | ||
b551a063 DG |
3097 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3098 | cmd_ctx->session, &channels); | |
54d01ffb | 3099 | if (nb_chan < 0) { |
f73fabfd | 3100 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3101 | ret = -nb_chan; |
3102 | goto error; | |
5461b305 | 3103 | } |
ca95a216 | 3104 | |
54d01ffb | 3105 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3106 | if (ret < 0) { |
ae9c20bc | 3107 | free(channels); |
5461b305 DG |
3108 | goto setup_error; |
3109 | } | |
9f19cc17 | 3110 | |
54d01ffb DG |
3111 | /* Copy event list into message payload */ |
3112 | memcpy(cmd_ctx->llm->payload, channels, | |
3113 | nb_chan * sizeof(struct lttng_channel)); | |
3114 | ||
3115 | free(channels); | |
9f19cc17 | 3116 | |
f73fabfd | 3117 | ret = LTTNG_OK; |
5461b305 | 3118 | break; |
5e16da05 | 3119 | } |
9f19cc17 | 3120 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3121 | { |
b551a063 | 3122 | ssize_t nb_event; |
684d34d2 | 3123 | struct lttng_event *events = NULL; |
9f19cc17 | 3124 | |
b551a063 | 3125 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3126 | cmd_ctx->lsm->u.list.channel_name, &events); |
3127 | if (nb_event < 0) { | |
f73fabfd | 3128 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3129 | ret = -nb_event; |
3130 | goto error; | |
5461b305 | 3131 | } |
ca95a216 | 3132 | |
54d01ffb | 3133 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3134 | if (ret < 0) { |
ae9c20bc | 3135 | free(events); |
5461b305 DG |
3136 | goto setup_error; |
3137 | } | |
9f19cc17 | 3138 | |
54d01ffb DG |
3139 | /* Copy event list into message payload */ |
3140 | memcpy(cmd_ctx->llm->payload, events, | |
3141 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3142 | |
54d01ffb | 3143 | free(events); |
9f19cc17 | 3144 | |
f73fabfd | 3145 | ret = LTTNG_OK; |
5461b305 | 3146 | break; |
5e16da05 MD |
3147 | } |
3148 | case LTTNG_LIST_SESSIONS: | |
3149 | { | |
8e0af1b4 | 3150 | unsigned int nr_sessions; |
5461b305 | 3151 | |
8e0af1b4 | 3152 | session_lock_list(); |
730389d9 DG |
3153 | nr_sessions = lttng_sessions_count( |
3154 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3155 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3156 | |
8e0af1b4 | 3157 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3158 | if (ret < 0) { |
54d01ffb | 3159 | session_unlock_list(); |
5461b305 | 3160 | goto setup_error; |
e065084a | 3161 | } |
5e16da05 | 3162 | |
6c9cc2ab | 3163 | /* Filled the session array */ |
2f77fc4b | 3164 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3165 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3166 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3167 | |
54d01ffb | 3168 | session_unlock_list(); |
5e16da05 | 3169 | |
f73fabfd | 3170 | ret = LTTNG_OK; |
5e16da05 MD |
3171 | break; |
3172 | } | |
d0254c7c MD |
3173 | case LTTNG_CALIBRATE: |
3174 | { | |
54d01ffb DG |
3175 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3176 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3177 | break; |
3178 | } | |
d9800920 DG |
3179 | case LTTNG_REGISTER_CONSUMER: |
3180 | { | |
2f77fc4b DG |
3181 | struct consumer_data *cdata; |
3182 | ||
3183 | switch (cmd_ctx->lsm->domain.type) { | |
3184 | case LTTNG_DOMAIN_KERNEL: | |
3185 | cdata = &kconsumer_data; | |
3186 | break; | |
3187 | default: | |
f73fabfd | 3188 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3189 | goto error; |
3190 | } | |
3191 | ||
54d01ffb | 3192 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3193 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3194 | break; |
3195 | } | |
025faf73 | 3196 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
3197 | { |
3198 | struct lttng_filter_bytecode *bytecode; | |
3199 | ||
025faf73 | 3200 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 3201 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3202 | goto error; |
3203 | } | |
52df2401 MD |
3204 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
3205 | ret = LTTNG_ERR_FILTER_INVAL; | |
3206 | goto error; | |
3207 | } | |
025faf73 | 3208 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 3209 | if (!bytecode) { |
f73fabfd | 3210 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
3211 | goto error; |
3212 | } | |
3213 | /* Receive var. len. data */ | |
3214 | DBG("Receiving var len data from client ..."); | |
3215 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 3216 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
3217 | if (ret <= 0) { |
3218 | DBG("Nothing recv() from client var len data... continuing"); | |
3219 | *sock_error = 1; | |
f73fabfd | 3220 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3221 | goto error; |
3222 | } | |
3223 | ||
3224 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 3225 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 3226 | free(bytecode); |
f73fabfd | 3227 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3228 | goto error; |
3229 | } | |
3230 | ||
7972aab2 | 3231 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
025faf73 DG |
3232 | cmd_ctx->lsm->u.enable.channel_name, |
3233 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
3234 | break; |
3235 | } | |
6d805429 | 3236 | case LTTNG_DATA_PENDING: |
806e2684 | 3237 | { |
6d805429 | 3238 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3239 | break; |
3240 | } | |
da3c9ec1 DG |
3241 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3242 | { | |
6dc3064a DG |
3243 | struct lttcomm_lttng_output_id reply; |
3244 | ||
3245 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3246 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3247 | if (ret != LTTNG_OK) { | |
3248 | goto error; | |
3249 | } | |
3250 | ||
3251 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3252 | if (ret < 0) { | |
3253 | goto setup_error; | |
3254 | } | |
3255 | ||
3256 | /* Copy output list into message payload */ | |
3257 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3258 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3259 | break; |
3260 | } | |
3261 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3262 | { | |
6dc3064a DG |
3263 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3264 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3265 | break; |
3266 | } | |
3267 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3268 | { | |
6dc3064a DG |
3269 | ssize_t nb_output; |
3270 | struct lttng_snapshot_output *outputs = NULL; | |
3271 | ||
3272 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3273 | if (nb_output < 0) { | |
3274 | ret = -nb_output; | |
3275 | goto error; | |
3276 | } | |
3277 | ||
3278 | ret = setup_lttng_msg(cmd_ctx, | |
3279 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3280 | if (ret < 0) { | |
3281 | free(outputs); | |
3282 | goto setup_error; | |
3283 | } | |
3284 | ||
3285 | if (outputs) { | |
3286 | /* Copy output list into message payload */ | |
3287 | memcpy(cmd_ctx->llm->payload, outputs, | |
3288 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3289 | free(outputs); | |
3290 | } | |
3291 | ||
3292 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3293 | break; |
3294 | } | |
3295 | case LTTNG_SNAPSHOT_RECORD: | |
3296 | { | |
6dc3064a DG |
3297 | ret = cmd_snapshot_record(cmd_ctx->session, |
3298 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3299 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3300 | break; |
3301 | } | |
27babd3a DG |
3302 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3303 | { | |
3304 | size_t nb_uri, len; | |
3305 | struct lttng_uri *uris = NULL; | |
3306 | ||
3307 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3308 | len = nb_uri * sizeof(struct lttng_uri); | |
3309 | ||
3310 | if (nb_uri > 0) { | |
3311 | uris = zmalloc(len); | |
3312 | if (uris == NULL) { | |
3313 | ret = LTTNG_ERR_FATAL; | |
3314 | goto error; | |
3315 | } | |
3316 | ||
3317 | /* Receive variable len data */ | |
3318 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3319 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3320 | if (ret <= 0) { | |
3321 | DBG("No URIs received from client... continuing"); | |
3322 | *sock_error = 1; | |
3323 | ret = LTTNG_ERR_SESSION_FAIL; | |
3324 | free(uris); | |
3325 | goto error; | |
3326 | } | |
3327 | ||
3328 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3329 | DBG("Creating session with ONE network URI is a bad call"); | |
3330 | ret = LTTNG_ERR_SESSION_FAIL; | |
3331 | free(uris); | |
3332 | goto error; | |
3333 | } | |
3334 | } | |
3335 | ||
3336 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3337 | nb_uri, &cmd_ctx->creds); | |
3338 | free(uris); | |
3339 | break; | |
3340 | } | |
5e16da05 | 3341 | default: |
f73fabfd | 3342 | ret = LTTNG_ERR_UND; |
5461b305 | 3343 | break; |
fac6795d DG |
3344 | } |
3345 | ||
5461b305 | 3346 | error: |
5461b305 DG |
3347 | if (cmd_ctx->llm == NULL) { |
3348 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3349 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3350 | goto setup_error; |
3351 | } | |
3352 | } | |
54d01ffb | 3353 | /* Set return code */ |
5461b305 | 3354 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3355 | setup_error: |
b5541356 | 3356 | if (cmd_ctx->session) { |
54d01ffb | 3357 | session_unlock(cmd_ctx->session); |
b5541356 | 3358 | } |
256a5576 MD |
3359 | if (need_tracing_session) { |
3360 | session_unlock_list(); | |
3361 | } | |
54d01ffb | 3362 | init_setup_error: |
8028d920 | 3363 | return ret; |
fac6795d DG |
3364 | } |
3365 | ||
44a5e5eb DG |
3366 | /* |
3367 | * Thread managing health check socket. | |
3368 | */ | |
3369 | static void *thread_manage_health(void *data) | |
3370 | { | |
eb4a2943 | 3371 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3372 | uint32_t revents, nb_fd; |
3373 | struct lttng_poll_event events; | |
3374 | struct lttcomm_health_msg msg; | |
3375 | struct lttcomm_health_data reply; | |
3376 | ||
3377 | DBG("[thread] Manage health check started"); | |
3378 | ||
3379 | rcu_register_thread(); | |
3380 | ||
6d737ce4 DG |
3381 | /* We might hit an error path before this is created. */ |
3382 | lttng_poll_init(&events); | |
3cc04881 | 3383 | |
44a5e5eb DG |
3384 | /* Create unix socket */ |
3385 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3386 | if (sock < 0) { | |
3387 | ERR("Unable to create health check Unix socket"); | |
3388 | ret = -1; | |
3389 | goto error; | |
3390 | } | |
3391 | ||
b662582b DG |
3392 | /* |
3393 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3394 | * show must go on. | |
3395 | */ | |
3396 | (void) utils_set_fd_cloexec(sock); | |
3397 | ||
44a5e5eb DG |
3398 | ret = lttcomm_listen_unix_sock(sock); |
3399 | if (ret < 0) { | |
3400 | goto error; | |
3401 | } | |
3402 | ||
3403 | /* | |
3404 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3405 | * more will be added to this poll set. | |
3406 | */ | |
d0b96690 | 3407 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3408 | if (ret < 0) { |
3409 | goto error; | |
3410 | } | |
3411 | ||
3412 | /* Add the application registration socket */ | |
3413 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3414 | if (ret < 0) { | |
3415 | goto error; | |
3416 | } | |
3417 | ||
3418 | while (1) { | |
3419 | DBG("Health check ready"); | |
3420 | ||
44a5e5eb DG |
3421 | /* Inifinite blocking call, waiting for transmission */ |
3422 | restart: | |
3423 | ret = lttng_poll_wait(&events, -1); | |
3424 | if (ret < 0) { | |
3425 | /* | |
3426 | * Restart interrupted system call. | |
3427 | */ | |
3428 | if (errno == EINTR) { | |
3429 | goto restart; | |
3430 | } | |
3431 | goto error; | |
3432 | } | |
3433 | ||
0d9c5d77 DG |
3434 | nb_fd = ret; |
3435 | ||
44a5e5eb DG |
3436 | for (i = 0; i < nb_fd; i++) { |
3437 | /* Fetch once the poll data */ | |
3438 | revents = LTTNG_POLL_GETEV(&events, i); | |
3439 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3440 | ||
3441 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3442 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3443 | if (ret) { |
139ac872 MD |
3444 | err = 0; |
3445 | goto exit; | |
44a5e5eb DG |
3446 | } |
3447 | ||
3448 | /* Event on the registration socket */ | |
3449 | if (pollfd == sock) { | |
3450 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3451 | ERR("Health socket poll error"); | |
3452 | goto error; | |
3453 | } | |
3454 | } | |
3455 | } | |
3456 | ||
3457 | new_sock = lttcomm_accept_unix_sock(sock); | |
3458 | if (new_sock < 0) { | |
3459 | goto error; | |
3460 | } | |
3461 | ||
b662582b DG |
3462 | /* |
3463 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3464 | * show must go on. | |
3465 | */ | |
3466 | (void) utils_set_fd_cloexec(new_sock); | |
3467 | ||
44a5e5eb DG |
3468 | DBG("Receiving data from client for health..."); |
3469 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3470 | if (ret <= 0) { | |
3471 | DBG("Nothing recv() from client... continuing"); | |
3472 | ret = close(new_sock); | |
3473 | if (ret) { | |
3474 | PERROR("close"); | |
3475 | } | |
3476 | new_sock = -1; | |
3477 | continue; | |
3478 | } | |
3479 | ||
3480 | rcu_thread_online(); | |
3481 | ||
3482 | switch (msg.component) { | |
3483 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3484 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3485 | break; |
139ac872 | 3486 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3487 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3488 | break; |
44a5e5eb | 3489 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3490 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3491 | break; |
3492 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3493 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3494 | break; |
3495 | case LTTNG_HEALTH_CONSUMER: | |
3496 | reply.ret_code = check_consumer_health(); | |
3497 | break; | |
0b2dc8df MD |
3498 | case LTTNG_HEALTH_HT_CLEANUP: |
3499 | reply.ret_code = health_check_state(HEALTH_TYPE_HT_CLEANUP); | |
3500 | break; | |
380e8d6f MD |
3501 | case LTTNG_HEALTH_APP_MANAGE_NOTIFY: |
3502 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY); | |
3503 | break; | |
12e2b881 MD |
3504 | case LTTNG_HEALTH_APP_REG_DISPATCH: |
3505 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
3506 | break; | |
44a5e5eb | 3507 | case LTTNG_HEALTH_ALL: |
44a5e5eb | 3508 | reply.ret_code = |
927ca06a DG |
3509 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3510 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3511 | health_check_state(HEALTH_TYPE_CMD) && | |
3512 | health_check_state(HEALTH_TYPE_KERNEL) && | |
0b2dc8df | 3513 | check_consumer_health() && |
380e8d6f | 3514 | health_check_state(HEALTH_TYPE_HT_CLEANUP) && |
12e2b881 MD |
3515 | health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY) && |
3516 | health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
44a5e5eb DG |
3517 | break; |
3518 | default: | |
f73fabfd | 3519 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3520 | break; |
3521 | } | |
3522 | ||
3523 | /* | |
3524 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3525 | * the client where in the sessiond it is the opposite. Again, this is | |
3526 | * just to make things easier for us poor developer which enjoy a lot | |
3527 | * lazyness. | |
3528 | */ | |
3529 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3530 | reply.ret_code = !reply.ret_code; | |
3531 | } | |
3532 | ||
3533 | DBG2("Health check return value %d", reply.ret_code); | |
3534 | ||
3535 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3536 | if (ret < 0) { | |
3537 | ERR("Failed to send health data back to client"); | |
3538 | } | |
3539 | ||
3540 | /* End of transmission */ | |
3541 | ret = close(new_sock); | |
3542 | if (ret) { | |
3543 | PERROR("close"); | |
3544 | } | |
3545 | new_sock = -1; | |
3546 | } | |
3547 | ||
139ac872 | 3548 | exit: |
44a5e5eb | 3549 | error: |
139ac872 MD |
3550 | if (err) { |
3551 | ERR("Health error occurred in %s", __func__); | |
3552 | } | |
44a5e5eb DG |
3553 | DBG("Health check thread dying"); |
3554 | unlink(health_unix_sock_path); | |
3555 | if (sock >= 0) { | |
3556 | ret = close(sock); | |
3557 | if (ret) { | |
3558 | PERROR("close"); | |
3559 | } | |
3560 | } | |
44a5e5eb DG |
3561 | |
3562 | lttng_poll_clean(&events); | |
3563 | ||
3564 | rcu_unregister_thread(); | |
3565 | return NULL; | |
3566 | } | |
3567 | ||
1d4b027a | 3568 | /* |
d063d709 DG |
3569 | * This thread manage all clients request using the unix client socket for |
3570 | * communication. | |
1d4b027a DG |
3571 | */ |
3572 | static void *thread_manage_clients(void *data) | |
3573 | { | |
139ac872 | 3574 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3575 | int sock_error; |
5eb91c98 | 3576 | uint32_t revents, nb_fd; |
273ea72c | 3577 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3578 | struct lttng_poll_event events; |
1d4b027a DG |
3579 | |
3580 | DBG("[thread] Manage client started"); | |
3581 | ||
f6a9efaa DG |
3582 | rcu_register_thread(); |
3583 | ||
927ca06a DG |
3584 | health_register(HEALTH_TYPE_CMD); |
3585 | ||
6993eeb3 CB |
3586 | if (testpoint(thread_manage_clients)) { |
3587 | goto error_testpoint; | |
3588 | } | |
3589 | ||
840cb59c | 3590 | health_code_update(); |
44a5e5eb | 3591 | |
1d4b027a DG |
3592 | ret = lttcomm_listen_unix_sock(client_sock); |
3593 | if (ret < 0) { | |
35df2755 | 3594 | goto error_listen; |
1d4b027a DG |
3595 | } |
3596 | ||
5eb91c98 DG |
3597 | /* |
3598 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3599 | * more will be added to this poll set. | |
3600 | */ | |
d0b96690 | 3601 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3602 | if (ret < 0) { |
35df2755 | 3603 | goto error_create_poll; |
5eb91c98 | 3604 | } |
273ea72c | 3605 | |
5eb91c98 DG |
3606 | /* Add the application registration socket */ |
3607 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3608 | if (ret < 0) { | |
3609 | goto error; | |
3610 | } | |
273ea72c | 3611 | |
bbd973c2 DG |
3612 | /* |
3613 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3614 | */ |
3615 | if (opt_sig_parent) { | |
8db8d1dc | 3616 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3617 | } |
3618 | ||
6993eeb3 CB |
3619 | if (testpoint(thread_manage_clients_before_loop)) { |
3620 | goto error; | |
3621 | } | |
8ac94142 | 3622 | |
840cb59c | 3623 | health_code_update(); |
44a5e5eb | 3624 | |
1d4b027a | 3625 | while (1) { |
1d4b027a | 3626 | DBG("Accepting client command ..."); |
273ea72c DG |
3627 | |
3628 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3629 | restart: |
a78af745 | 3630 | health_poll_entry(); |
5eb91c98 | 3631 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3632 | health_poll_exit(); |
273ea72c | 3633 | if (ret < 0) { |
88f2b785 MD |
3634 | /* |
3635 | * Restart interrupted system call. | |
3636 | */ | |
3637 | if (errno == EINTR) { | |
3638 | goto restart; | |
3639 | } | |
273ea72c DG |
3640 | goto error; |
3641 | } | |
3642 | ||
0d9c5d77 DG |
3643 | nb_fd = ret; |
3644 | ||
5eb91c98 DG |
3645 | for (i = 0; i < nb_fd; i++) { |
3646 | /* Fetch once the poll data */ | |
3647 | revents = LTTNG_POLL_GETEV(&events, i); | |
3648 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3649 | ||
840cb59c | 3650 | health_code_update(); |
44a5e5eb | 3651 | |
5eb91c98 | 3652 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3653 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3654 | if (ret) { |
139ac872 MD |
3655 | err = 0; |
3656 | goto exit; | |
5eb91c98 DG |
3657 | } |
3658 | ||
3659 | /* Event on the registration socket */ | |
3660 | if (pollfd == client_sock) { | |
3661 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3662 | ERR("Client socket poll error"); | |
3663 | goto error; | |
3664 | } | |
3665 | } | |
3666 | } | |
3667 | ||
3668 | DBG("Wait for client response"); | |
3669 | ||
840cb59c | 3670 | health_code_update(); |
44a5e5eb | 3671 | |
5eb91c98 DG |
3672 | sock = lttcomm_accept_unix_sock(client_sock); |
3673 | if (sock < 0) { | |
273ea72c | 3674 | goto error; |
273ea72c DG |
3675 | } |
3676 | ||
b662582b DG |
3677 | /* |
3678 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3679 | * show must go on. | |
3680 | */ | |
3681 | (void) utils_set_fd_cloexec(sock); | |
3682 | ||
be040666 DG |
3683 | /* Set socket option for credentials retrieval */ |
3684 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3685 | if (ret < 0) { | |
3686 | goto error; | |
3687 | } | |
3688 | ||
5eb91c98 | 3689 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3690 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3691 | if (cmd_ctx == NULL) { |
76d7553f | 3692 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3693 | goto error; |
5eb91c98 | 3694 | } |
1d4b027a | 3695 | |
5eb91c98 | 3696 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3697 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3698 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3699 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3700 | goto error; |
3701 | } | |
1d4b027a | 3702 | |
5eb91c98 DG |
3703 | cmd_ctx->llm = NULL; |
3704 | cmd_ctx->session = NULL; | |
1d4b027a | 3705 | |
840cb59c | 3706 | health_code_update(); |
44a5e5eb | 3707 | |
5eb91c98 DG |
3708 | /* |
3709 | * Data is received from the lttng client. The struct | |
3710 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3711 | * the client. | |
3712 | */ | |
3713 | DBG("Receiving data from client ..."); | |
be040666 DG |
3714 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3715 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3716 | if (ret <= 0) { |
3717 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3718 | ret = close(sock); |
3719 | if (ret) { | |
3720 | PERROR("close"); | |
3721 | } | |
3722 | sock = -1; | |
a2c0da86 | 3723 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3724 | continue; |
3725 | } | |
1d4b027a | 3726 | |
840cb59c | 3727 | health_code_update(); |
44a5e5eb | 3728 | |
5eb91c98 DG |
3729 | // TODO: Validate cmd_ctx including sanity check for |
3730 | // security purpose. | |
f7776ea7 | 3731 | |
f6a9efaa | 3732 | rcu_thread_online(); |
5eb91c98 DG |
3733 | /* |
3734 | * This function dispatch the work to the kernel or userspace tracer | |
3735 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3736 | * informations for the client. The command context struct contains | |
3737 | * everything this function may needs. | |
3738 | */ | |
53a80697 | 3739 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3740 | rcu_thread_offline(); |
5eb91c98 | 3741 | if (ret < 0) { |
36134aa1 DG |
3742 | ret = close(sock); |
3743 | if (ret) { | |
3744 | PERROR("close"); | |
53a80697 | 3745 | } |
36134aa1 | 3746 | sock = -1; |
bbd973c2 | 3747 | /* |
5eb91c98 | 3748 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3749 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3750 | * (ENOMEM). Error detected but still accept |
3751 | * command, unless a socket error has been | |
3752 | * detected. | |
bbd973c2 | 3753 | */ |
bbd973c2 | 3754 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3755 | continue; |
3756 | } | |
d6e4fca4 | 3757 | |
840cb59c | 3758 | health_code_update(); |
44a5e5eb | 3759 | |
54d01ffb DG |
3760 | DBG("Sending response (size: %d, retcode: %s)", |
3761 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3762 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3763 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3764 | if (ret < 0) { |
3765 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3766 | } |
1d4b027a | 3767 | |
5eb91c98 | 3768 | /* End of transmission */ |
76d7553f MD |
3769 | ret = close(sock); |
3770 | if (ret) { | |
3771 | PERROR("close"); | |
3772 | } | |
3773 | sock = -1; | |
be040666 DG |
3774 | |
3775 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3776 | |
840cb59c | 3777 | health_code_update(); |
273ea72c DG |
3778 | } |
3779 | ||
139ac872 | 3780 | exit: |
5eb91c98 | 3781 | error: |
35df2755 CB |
3782 | if (sock >= 0) { |
3783 | ret = close(sock); | |
3784 | if (ret) { | |
3785 | PERROR("close"); | |
3786 | } | |
139ac872 | 3787 | } |
44a5e5eb | 3788 | |
35df2755 CB |
3789 | lttng_poll_clean(&events); |
3790 | clean_command_ctx(&cmd_ctx); | |
3791 | ||
3792 | error_listen: | |
3793 | error_create_poll: | |
6993eeb3 | 3794 | error_testpoint: |
273ea72c | 3795 | unlink(client_unix_sock_path); |
76d7553f MD |
3796 | if (client_sock >= 0) { |
3797 | ret = close(client_sock); | |
3798 | if (ret) { | |
3799 | PERROR("close"); | |
3800 | } | |
a4b35e07 | 3801 | } |
35df2755 CB |
3802 | |
3803 | if (err) { | |
840cb59c | 3804 | health_error(); |
35df2755 | 3805 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3806 | } |
273ea72c | 3807 | |
927ca06a | 3808 | health_unregister(); |
35df2755 CB |
3809 | |
3810 | DBG("Client thread dying"); | |
f6a9efaa DG |
3811 | |
3812 | rcu_unregister_thread(); | |
1d4b027a DG |
3813 | return NULL; |
3814 | } | |
3815 | ||
3816 | ||
fac6795d DG |
3817 | /* |
3818 | * usage function on stderr | |
3819 | */ | |
3820 | static void usage(void) | |
3821 | { | |
b716ce68 | 3822 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3823 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3824 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3825 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3826 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3827 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3828 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3829 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3830 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3831 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3832 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3833 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3834 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3835 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3836 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3837 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3838 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3839 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3840 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3841 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3842 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3843 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3844 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3845 | } |
3846 | ||
3847 | /* | |
3848 | * daemon argument parsing | |
3849 | */ | |
3850 | static int parse_args(int argc, char **argv) | |
3851 | { | |
3852 | int c; | |
3853 | ||
3854 | static struct option long_options[] = { | |
3855 | { "client-sock", 1, 0, 'c' }, | |
3856 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3857 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3858 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3859 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3860 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3861 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3862 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3863 | { "consumerd32-path", 1, 0, 'u' }, | |
3864 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3865 | { "consumerd64-path", 1, 0, 't' }, | |
3866 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3867 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3868 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3869 | { "help", 0, 0, 'h' }, |
3870 | { "group", 1, 0, 'g' }, | |
3871 | { "version", 0, 0, 'V' }, | |
75462a81 | 3872 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3873 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3874 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3875 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3876 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3877 | { NULL, 0, 0, 0 } |
3878 | }; | |
3879 | ||
3880 | while (1) { | |
3881 | int option_index = 0; | |
35f90c40 | 3882 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3883 | long_options, &option_index); |
fac6795d DG |
3884 | if (c == -1) { |
3885 | break; | |
3886 | } | |
3887 | ||
3888 | switch (c) { | |
3889 | case 0: | |
3890 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3891 | if (optarg) { | |
3892 | fprintf(stderr, " with arg %s\n", optarg); | |
3893 | } | |
3894 | break; | |
b716ce68 | 3895 | case 'c': |
fac6795d DG |
3896 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3897 | break; | |
3898 | case 'a': | |
3899 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3900 | break; | |
3901 | case 'd': | |
3902 | opt_daemon = 1; | |
3903 | break; | |
3904 | case 'g': | |
fb09408a | 3905 | opt_tracing_group = optarg; |
fac6795d DG |
3906 | break; |
3907 | case 'h': | |
3908 | usage(); | |
3909 | exit(EXIT_FAILURE); | |
3910 | case 'V': | |
3911 | fprintf(stdout, "%s\n", VERSION); | |
3912 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3913 | case 'S': |
3914 | opt_sig_parent = 1; | |
3915 | break; | |
d6f42150 | 3916 | case 'E': |
3bd1e081 | 3917 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3918 | break; |
3919 | case 'C': | |
3bd1e081 MD |
3920 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3921 | break; | |
3922 | case 'F': | |
7753dea8 | 3923 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3924 | break; |
3925 | case 'D': | |
7753dea8 MD |
3926 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3927 | break; | |
3928 | case 'H': | |
3929 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3930 | break; | |
3931 | case 'G': | |
3932 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3933 | break; |
4fba7219 DG |
3934 | case 'N': |
3935 | opt_no_kernel = 1; | |
3936 | break; | |
75462a81 | 3937 | case 'q': |
97e19046 | 3938 | lttng_opt_quiet = 1; |
75462a81 | 3939 | break; |
3f9947db | 3940 | case 'v': |
53086306 | 3941 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3942 | lttng_opt_verbose += 1; |
3f9947db | 3943 | break; |
31f73cc9 | 3944 | case 'Z': |
3bd1e081 | 3945 | opt_verbose_consumer += 1; |
31f73cc9 | 3946 | break; |
fb09408a | 3947 | case 'u': |
fc7a59ce | 3948 | consumerd32_bin= optarg; |
ebaeda94 MD |
3949 | break; |
3950 | case 'U': | |
3951 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3952 | break; |
3953 | case 't': | |
fc7a59ce | 3954 | consumerd64_bin = optarg; |
ebaeda94 MD |
3955 | break; |
3956 | case 'T': | |
3957 | consumerd64_libdir = optarg; | |
fb09408a | 3958 | break; |
35f90c40 DG |
3959 | case 'p': |
3960 | opt_pidfile = optarg; | |
3961 | break; | |
fac6795d DG |
3962 | default: |
3963 | /* Unknown option or other error. | |
3964 | * Error is printed by getopt, just return */ | |
3965 | return -1; | |
3966 | } | |
3967 | } | |
3968 | ||
3969 | return 0; | |
3970 | } | |
3971 | ||
3972 | /* | |
d063d709 | 3973 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3974 | * apps_sock - The communication socket for all UST apps. |
3975 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3976 | */ |
cf3af59e | 3977 | static int init_daemon_socket(void) |
fac6795d DG |
3978 | { |
3979 | int ret = 0; | |
3980 | mode_t old_umask; | |
3981 | ||
3982 | old_umask = umask(0); | |
3983 | ||
3984 | /* Create client tool unix socket */ | |
d6f42150 DG |
3985 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3986 | if (client_sock < 0) { | |
3987 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3988 | ret = -1; |
3989 | goto end; | |
3990 | } | |
3991 | ||
b662582b DG |
3992 | /* Set the cloexec flag */ |
3993 | ret = utils_set_fd_cloexec(client_sock); | |
3994 | if (ret < 0) { | |
3995 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3996 | "Continuing but note that the consumer daemon will have a " | |
3997 | "reference to this socket on exec()", client_sock); | |
3998 | } | |
3999 | ||
fac6795d DG |
4000 | /* File permission MUST be 660 */ |
4001 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4002 | if (ret < 0) { | |
d6f42150 | 4003 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4004 | PERROR("chmod"); |
fac6795d DG |
4005 | goto end; |
4006 | } | |
4007 | ||
4008 | /* Create the application unix socket */ | |
d6f42150 DG |
4009 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4010 | if (apps_sock < 0) { | |
4011 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4012 | ret = -1; |
4013 | goto end; | |
4014 | } | |
4015 | ||
b662582b DG |
4016 | /* Set the cloexec flag */ |
4017 | ret = utils_set_fd_cloexec(apps_sock); | |
4018 | if (ret < 0) { | |
4019 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
4020 | "Continuing but note that the consumer daemon will have a " | |
4021 | "reference to this socket on exec()", apps_sock); | |
4022 | } | |
4023 | ||
d6f42150 | 4024 | /* File permission MUST be 666 */ |
54d01ffb DG |
4025 | ret = chmod(apps_unix_sock_path, |
4026 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4027 | if (ret < 0) { |
d6f42150 | 4028 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4029 | PERROR("chmod"); |
fac6795d DG |
4030 | goto end; |
4031 | } | |
4032 | ||
b662582b DG |
4033 | DBG3("Session daemon client socket %d and application socket %d created", |
4034 | client_sock, apps_sock); | |
4035 | ||
fac6795d DG |
4036 | end: |
4037 | umask(old_umask); | |
4038 | return ret; | |
4039 | } | |
4040 | ||
4041 | /* | |
54d01ffb DG |
4042 | * Check if the global socket is available, and if a daemon is answering at the |
4043 | * other side. If yes, error is returned. | |
fac6795d | 4044 | */ |
cf3af59e | 4045 | static int check_existing_daemon(void) |
fac6795d | 4046 | { |
7d8234d9 | 4047 | /* Is there anybody out there ? */ |
099e26bd | 4048 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4049 | return -EEXIST; |
099e26bd | 4050 | } |
b09c7c76 DG |
4051 | |
4052 | return 0; | |
fac6795d DG |
4053 | } |
4054 | ||
fac6795d | 4055 | /* |
d063d709 | 4056 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4057 | * |
d063d709 | 4058 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4059 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4060 | */ |
be040666 | 4061 | static int set_permissions(char *rundir) |
fac6795d DG |
4062 | { |
4063 | int ret; | |
996b65c8 | 4064 | gid_t gid; |
fac6795d | 4065 | |
6775595e DG |
4066 | ret = allowed_group(); |
4067 | if (ret < 0) { | |
be040666 DG |
4068 | WARN("No tracing group detected"); |
4069 | ret = 0; | |
fac6795d DG |
4070 | goto end; |
4071 | } | |
4072 | ||
6775595e DG |
4073 | gid = ret; |
4074 | ||
d6f42150 | 4075 | /* Set lttng run dir */ |
be040666 | 4076 | ret = chown(rundir, 0, gid); |
d6f42150 | 4077 | if (ret < 0) { |
be040666 | 4078 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4079 | PERROR("chown"); |
d6f42150 DG |
4080 | } |
4081 | ||
d1613cf5 | 4082 | /* Ensure tracing group can search the run dir */ |
61076f74 | 4083 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4084 | if (ret < 0) { |
4085 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4086 | PERROR("chmod"); |
d1613cf5 JN |
4087 | } |
4088 | ||
d6f42150 | 4089 | /* lttng client socket path */ |
996b65c8 | 4090 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4091 | if (ret < 0) { |
d6f42150 | 4092 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4093 | PERROR("chown"); |
d6f42150 DG |
4094 | } |
4095 | ||
3bd1e081 MD |
4096 | /* kconsumer error socket path */ |
4097 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4098 | if (ret < 0) { |
3bd1e081 | 4099 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4100 | PERROR("chown"); |
3bd1e081 MD |
4101 | } |
4102 | ||
7753dea8 MD |
4103 | /* 64-bit ustconsumer error socket path */ |
4104 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4105 | if (ret < 0) { | |
4106 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4107 | PERROR("chown"); |
7753dea8 MD |
4108 | } |
4109 | ||
4110 | /* 32-bit ustconsumer compat32 error socket path */ | |
4111 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4112 | if (ret < 0) { |
7753dea8 | 4113 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4114 | PERROR("chown"); |
fac6795d DG |
4115 | } |
4116 | ||
d6f42150 | 4117 | DBG("All permissions are set"); |
e07ae692 | 4118 | |
fac6795d DG |
4119 | end: |
4120 | return ret; | |
4121 | } | |
4122 | ||
d6f42150 | 4123 | /* |
d063d709 | 4124 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4125 | */ |
67e40797 | 4126 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4127 | { |
4128 | int ret; | |
4129 | ||
67e40797 DG |
4130 | DBG3("Creating LTTng run directory: %s", rundir); |
4131 | ||
d1613cf5 | 4132 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4133 | if (ret < 0) { |
b1f11e69 | 4134 | if (errno != EEXIST) { |
67e40797 | 4135 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4136 | goto error; |
4137 | } else { | |
4138 | ret = 0; | |
4139 | } | |
d6f42150 DG |
4140 | } |
4141 | ||
4142 | error: | |
4143 | return ret; | |
4144 | } | |
4145 | ||
4146 | /* | |
d063d709 DG |
4147 | * Setup sockets and directory needed by the kconsumerd communication with the |
4148 | * session daemon. | |
d6f42150 | 4149 | */ |
67e40797 DG |
4150 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4151 | const char *rundir) | |
d6f42150 DG |
4152 | { |
4153 | int ret; | |
67e40797 | 4154 | char path[PATH_MAX]; |
d6f42150 | 4155 | |
67e40797 | 4156 | switch (consumer_data->type) { |
7753dea8 | 4157 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4158 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4159 | break; |
4160 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4161 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4162 | break; |
4163 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4164 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4165 | break; |
4166 | default: | |
4167 | ERR("Consumer type unknown"); | |
4168 | ret = -EINVAL; | |
4169 | goto error; | |
d6f42150 DG |
4170 | } |
4171 | ||
67e40797 DG |
4172 | DBG2("Creating consumer directory: %s", path); |
4173 | ||
d1613cf5 | 4174 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4175 | if (ret < 0) { |
6beb2242 | 4176 | if (errno != EEXIST) { |
f11e84c2 | 4177 | PERROR("mkdir"); |
3bd1e081 | 4178 | ERR("Failed to create %s", path); |
6beb2242 DG |
4179 | goto error; |
4180 | } | |
f11e84c2 | 4181 | ret = -1; |
d6f42150 DG |
4182 | } |
4183 | ||
4184 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4185 | consumer_data->err_sock = |
4186 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4187 | if (consumer_data->err_sock < 0) { | |
4188 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4189 | ret = -1; |
4190 | goto error; | |
4191 | } | |
4192 | ||
a24f05ab MD |
4193 | /* |
4194 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4195 | * show must go on. | |
4196 | */ | |
4197 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
4198 | if (ret < 0) { | |
4199 | PERROR("utils_set_fd_cloexec"); | |
4200 | /* continue anyway */ | |
4201 | } | |
4202 | ||
d6f42150 | 4203 | /* File permission MUST be 660 */ |
3bd1e081 | 4204 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4205 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4206 | if (ret < 0) { |
3bd1e081 | 4207 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4208 | PERROR("chmod"); |
d6f42150 DG |
4209 | goto error; |
4210 | } | |
4211 | ||
4212 | error: | |
4213 | return ret; | |
4214 | } | |
4215 | ||
fac6795d | 4216 | /* |
d063d709 | 4217 | * Signal handler for the daemon |
cf3af59e | 4218 | * |
54d01ffb DG |
4219 | * Simply stop all worker threads, leaving main() return gracefully after |
4220 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4221 | */ |
4222 | static void sighandler(int sig) | |
4223 | { | |
4224 | switch (sig) { | |
cf3af59e | 4225 | case SIGPIPE: |
af87c45a | 4226 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4227 | return; |
4228 | case SIGINT: | |
af87c45a | 4229 | DBG("SIGINT caught"); |
cf3af59e MD |
4230 | stop_threads(); |
4231 | break; | |
4232 | case SIGTERM: | |
af87c45a | 4233 | DBG("SIGTERM caught"); |
cf3af59e MD |
4234 | stop_threads(); |
4235 | break; | |
4236 | default: | |
4237 | break; | |
fac6795d | 4238 | } |
fac6795d DG |
4239 | } |
4240 | ||
4241 | /* | |
d063d709 | 4242 | * Setup signal handler for : |
1d4b027a | 4243 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4244 | */ |
1d4b027a | 4245 | static int set_signal_handler(void) |
fac6795d | 4246 | { |
1d4b027a DG |
4247 | int ret = 0; |
4248 | struct sigaction sa; | |
4249 | sigset_t sigset; | |
fac6795d | 4250 | |
1d4b027a | 4251 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4252 | PERROR("sigemptyset"); |
1d4b027a DG |
4253 | return ret; |
4254 | } | |
d6f42150 | 4255 | |
1d4b027a DG |
4256 | sa.sa_handler = sighandler; |
4257 | sa.sa_mask = sigset; | |
4258 | sa.sa_flags = 0; | |
4259 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4260 | PERROR("sigaction"); |
1d4b027a | 4261 | return ret; |
d6f42150 DG |
4262 | } |
4263 | ||
1d4b027a | 4264 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4265 | PERROR("sigaction"); |
1d4b027a | 4266 | return ret; |
d6f42150 | 4267 | } |
aaf26714 | 4268 | |
1d4b027a | 4269 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4270 | PERROR("sigaction"); |
1d4b027a | 4271 | return ret; |
8c0faa1d DG |
4272 | } |
4273 | ||
1d4b027a DG |
4274 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4275 | ||
4276 | return ret; | |
fac6795d DG |
4277 | } |
4278 | ||
f3ed775e | 4279 | /* |
d063d709 DG |
4280 | * Set open files limit to unlimited. This daemon can open a large number of |
4281 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4282 | */ |
4283 | static void set_ulimit(void) | |
4284 | { | |
4285 | int ret; | |
4286 | struct rlimit lim; | |
4287 | ||
a88df331 | 4288 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4289 | lim.rlim_cur = 65535; |
4290 | lim.rlim_max = 65535; | |
4291 | ||
4292 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4293 | if (ret < 0) { | |
76d7553f | 4294 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4295 | } |
4296 | } | |
4297 | ||
35f90c40 DG |
4298 | /* |
4299 | * Write pidfile using the rundir and opt_pidfile. | |
4300 | */ | |
4301 | static void write_pidfile(void) | |
4302 | { | |
4303 | int ret; | |
4304 | char pidfile_path[PATH_MAX]; | |
4305 | ||
4306 | assert(rundir); | |
4307 | ||
4308 | if (opt_pidfile) { | |
4309 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
4310 | } else { | |
4311 | /* Build pidfile path from rundir and opt_pidfile. */ | |
4312 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
4313 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
4314 | if (ret < 0) { | |
4315 | PERROR("snprintf pidfile path"); | |
4316 | goto error; | |
4317 | } | |
4318 | } | |
4319 | ||
4320 | /* | |
4321 | * Create pid file in rundir. Return value is of no importance. The | |
4322 | * execution will continue even though we are not able to write the file. | |
4323 | */ | |
4324 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
4325 | ||
4326 | error: | |
4327 | return; | |
4328 | } | |
4329 | ||
fac6795d DG |
4330 | /* |
4331 | * main | |
4332 | */ | |
4333 | int main(int argc, char **argv) | |
4334 | { | |
fac6795d DG |
4335 | int ret = 0; |
4336 | void *status; | |
ae9e45b3 | 4337 | const char *home_path, *env_app_timeout; |
fac6795d | 4338 | |
335a95b7 MD |
4339 | init_kernel_workarounds(); |
4340 | ||
f6a9efaa DG |
4341 | rcu_register_thread(); |
4342 | ||
7753dea8 | 4343 | setup_consumerd_path(); |
fb09408a | 4344 | |
12744796 DG |
4345 | page_size = sysconf(_SC_PAGESIZE); |
4346 | if (page_size < 0) { | |
4347 | PERROR("sysconf _SC_PAGESIZE"); | |
4348 | page_size = LONG_MAX; | |
4349 | WARN("Fallback page size to %ld", page_size); | |
4350 | } | |
4351 | ||
fac6795d DG |
4352 | /* Parse arguments */ |
4353 | progname = argv[0]; | |
c617c0c6 | 4354 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 4355 | goto error; |
fac6795d DG |
4356 | } |
4357 | ||
4358 | /* Daemonize */ | |
4359 | if (opt_daemon) { | |
ceed52b5 MD |
4360 | int i; |
4361 | ||
4362 | /* | |
4363 | * fork | |
4364 | * child: setsid, close FD 0, 1, 2, chdir / | |
4365 | * parent: exit (if fork is successful) | |
4366 | */ | |
53094c05 DG |
4367 | ret = daemon(0, 0); |
4368 | if (ret < 0) { | |
76d7553f | 4369 | PERROR("daemon"); |
cf3af59e | 4370 | goto error; |
53094c05 | 4371 | } |
ceed52b5 MD |
4372 | /* |
4373 | * We are in the child. Make sure all other file | |
4374 | * descriptors are closed, in case we are called with | |
4375 | * more opened file descriptors than the standard ones. | |
4376 | */ | |
4377 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4378 | (void) close(i); | |
4379 | } | |
4380 | } | |
4381 | ||
4382 | /* Create thread quit pipe */ | |
4383 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4384 | goto error; | |
fac6795d DG |
4385 | } |
4386 | ||
4387 | /* Check if daemon is UID = 0 */ | |
4388 | is_root = !getuid(); | |
4389 | ||
fac6795d | 4390 | if (is_root) { |
990570ed | 4391 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4392 | |
4393 | /* Create global run dir with root access */ | |
4394 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4395 | if (ret < 0) { |
cf3af59e | 4396 | goto error; |
d6f42150 DG |
4397 | } |
4398 | ||
fac6795d | 4399 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4400 | snprintf(apps_unix_sock_path, PATH_MAX, |
4401 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4402 | } |
4403 | ||
4404 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4405 | snprintf(client_unix_sock_path, PATH_MAX, |
4406 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4407 | } | |
0fdd1e2c DG |
4408 | |
4409 | /* Set global SHM for ust */ | |
4410 | if (strlen(wait_shm_path) == 0) { | |
4411 | snprintf(wait_shm_path, PATH_MAX, | |
4412 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4413 | } | |
67e40797 | 4414 | |
44a5e5eb DG |
4415 | if (strlen(health_unix_sock_path) == 0) { |
4416 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4417 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4418 | } | |
4419 | ||
67e40797 DG |
4420 | /* Setup kernel consumerd path */ |
4421 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4422 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4423 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4424 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4425 | |
4426 | DBG2("Kernel consumer err path: %s", | |
4427 | kconsumer_data.err_unix_sock_path); | |
4428 | DBG2("Kernel consumer cmd path: %s", | |
4429 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4430 | } else { |
feb0f3e5 | 4431 | home_path = utils_get_home_dir(); |
b082db07 | 4432 | if (home_path == NULL) { |
273ea72c DG |
4433 | /* TODO: Add --socket PATH option */ |
4434 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4435 | ret = -EPERM; |
4436 | goto error; | |
b082db07 DG |
4437 | } |
4438 | ||
67e40797 DG |
4439 | /* |
4440 | * Create rundir from home path. This will create something like | |
4441 | * $HOME/.lttng | |
4442 | */ | |
990570ed | 4443 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4444 | if (ret < 0) { |
4445 | ret = -ENOMEM; | |
4446 | goto error; | |
4447 | } | |
4448 | ||
4449 | ret = create_lttng_rundir(rundir); | |
4450 | if (ret < 0) { | |
4451 | goto error; | |
4452 | } | |
4453 | ||
fac6795d | 4454 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4455 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4456 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4457 | } |
4458 | ||
4459 | /* Set the cli tool unix socket path */ | |
4460 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4461 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4462 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4463 | } |
0fdd1e2c DG |
4464 | |
4465 | /* Set global SHM for ust */ | |
4466 | if (strlen(wait_shm_path) == 0) { | |
4467 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4468 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4469 | } |
44a5e5eb DG |
4470 | |
4471 | /* Set health check Unix path */ | |
4472 | if (strlen(health_unix_sock_path) == 0) { | |
4473 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4474 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4475 | } | |
fac6795d DG |
4476 | } |
4477 | ||
5c827ce0 DG |
4478 | /* Set consumer initial state */ |
4479 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4480 | ust_consumerd_state = CONSUMER_STOPPED; | |
4481 | ||
847177cd DG |
4482 | DBG("Client socket path %s", client_unix_sock_path); |
4483 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4484 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4485 | DBG("LTTng run directory path: %s", rundir); |
4486 | ||
4487 | /* 32 bits consumerd path setup */ | |
4488 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4489 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4490 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4491 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4492 | |
4493 | DBG2("UST consumer 32 bits err path: %s", | |
4494 | ustconsumer32_data.err_unix_sock_path); | |
4495 | DBG2("UST consumer 32 bits cmd path: %s", | |
4496 | ustconsumer32_data.cmd_unix_sock_path); | |
4497 | ||
4498 | /* 64 bits consumerd path setup */ | |
4499 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4500 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4501 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4502 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4503 | |
4504 | DBG2("UST consumer 64 bits err path: %s", | |
4505 | ustconsumer64_data.err_unix_sock_path); | |
4506 | DBG2("UST consumer 64 bits cmd path: %s", | |
4507 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4508 | |
273ea72c | 4509 | /* |
7d8234d9 | 4510 | * See if daemon already exist. |
fac6795d | 4511 | */ |
7d8234d9 | 4512 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4513 | ERR("Already running daemon.\n"); |
273ea72c | 4514 | /* |
cf3af59e MD |
4515 | * We do not goto exit because we must not cleanup() |
4516 | * because a daemon is already running. | |
ab118b20 | 4517 | */ |
cf3af59e | 4518 | goto error; |
a88df331 DG |
4519 | } |
4520 | ||
1427f9b2 DG |
4521 | /* |
4522 | * Init UST app hash table. Alloc hash table before this point since | |
4523 | * cleanup() can get called after that point. | |
4524 | */ | |
4525 | ust_app_ht_alloc(); | |
4526 | ||
54d01ffb | 4527 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4528 | |
4529 | /* | |
4530 | * These actions must be executed as root. We do that *after* setting up | |
4531 | * the sockets path because we MUST make the check for another daemon using | |
4532 | * those paths *before* trying to set the kernel consumer sockets and init | |
4533 | * kernel tracer. | |
4534 | */ | |
4535 | if (is_root) { | |
67e40797 | 4536 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4537 | if (ret < 0) { |
4538 | goto exit; | |
4539 | } | |
4540 | ||
a88df331 | 4541 | /* Setup kernel tracer */ |
4fba7219 DG |
4542 | if (!opt_no_kernel) { |
4543 | init_kernel_tracer(); | |
4544 | } | |
a88df331 DG |
4545 | |
4546 | /* Set ulimit for open files */ | |
4547 | set_ulimit(); | |
fac6795d | 4548 | } |
4063050c MD |
4549 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4550 | lttng_fd_init(); | |
fac6795d | 4551 | |
67e40797 DG |
4552 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4553 | if (ret < 0) { | |
4554 | goto exit; | |
4555 | } | |
4556 | ||
4557 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4558 | if (ret < 0) { | |
4559 | goto exit; | |
4560 | } | |
4561 | ||
cf3af59e MD |
4562 | if ((ret = set_signal_handler()) < 0) { |
4563 | goto exit; | |
fac6795d DG |
4564 | } |
4565 | ||
d6f42150 | 4566 | /* Setup the needed unix socket */ |
cf3af59e MD |
4567 | if ((ret = init_daemon_socket()) < 0) { |
4568 | goto exit; | |
fac6795d DG |
4569 | } |
4570 | ||
4571 | /* Set credentials to socket */ | |
be040666 | 4572 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4573 | goto exit; |
fac6795d DG |
4574 | } |
4575 | ||
5b8719f5 DG |
4576 | /* Get parent pid if -S, --sig-parent is specified. */ |
4577 | if (opt_sig_parent) { | |
4578 | ppid = getppid(); | |
4579 | } | |
4580 | ||
7a485870 | 4581 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4582 | if (is_root && !opt_no_kernel) { |
4583 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4584 | goto exit; | |
4585 | } | |
7a485870 DG |
4586 | } |
4587 | ||
0b2dc8df MD |
4588 | /* Setup the thread ht_cleanup communication pipe. */ |
4589 | if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) { | |
4590 | goto exit; | |
4591 | } | |
4592 | ||
099e26bd | 4593 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4594 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4595 | goto exit; |
4596 | } | |
4597 | ||
d0b96690 DG |
4598 | /* Setup the thread apps notify communication pipe. */ |
4599 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
4600 | goto exit; | |
4601 | } | |
4602 | ||
7972aab2 DG |
4603 | /* Initialize global buffer per UID and PID registry. */ |
4604 | buffer_reg_init_uid_registry(); | |
4605 | buffer_reg_init_pid_registry(); | |
4606 | ||
099e26bd DG |
4607 | /* Init UST command queue. */ |
4608 | cds_wfq_init(&ust_cmd_queue.queue); | |
4609 | ||
273ea72c | 4610 | /* |
54d01ffb DG |
4611 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4612 | * statically declared in session.c | |
273ea72c | 4613 | */ |
54d01ffb | 4614 | session_list_ptr = session_get_list(); |
b5541356 | 4615 | |
5eb91c98 DG |
4616 | /* Set up max poll set size */ |
4617 | lttng_poll_set_max_size(); | |
4618 | ||
2f77fc4b | 4619 | cmd_init(); |
00e2e675 | 4620 | |
ae9e45b3 DG |
4621 | /* Check for the application socket timeout env variable. */ |
4622 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4623 | if (env_app_timeout) { | |
4624 | app_socket_timeout = atoi(env_app_timeout); | |
4625 | } else { | |
4626 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4627 | } | |
4628 | ||
35f90c40 DG |
4629 | write_pidfile(); |
4630 | ||
0b2dc8df MD |
4631 | /* Create thread to manage the client socket */ |
4632 | ret = pthread_create(&ht_cleanup_thread, NULL, | |
4633 | thread_ht_cleanup, (void *) NULL); | |
4634 | if (ret != 0) { | |
4635 | PERROR("pthread_create ht_cleanup"); | |
4636 | goto exit_ht_cleanup; | |
4637 | } | |
4638 | ||
44a5e5eb DG |
4639 | /* Create thread to manage the client socket */ |
4640 | ret = pthread_create(&health_thread, NULL, | |
4641 | thread_manage_health, (void *) NULL); | |
4642 | if (ret != 0) { | |
4643 | PERROR("pthread_create health"); | |
4644 | goto exit_health; | |
4645 | } | |
4646 | ||
cf3af59e | 4647 | /* Create thread to manage the client socket */ |
099e26bd DG |
4648 | ret = pthread_create(&client_thread, NULL, |
4649 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4650 | if (ret != 0) { |
76d7553f | 4651 | PERROR("pthread_create clients"); |
cf3af59e MD |
4652 | goto exit_client; |
4653 | } | |
fac6795d | 4654 | |
099e26bd DG |
4655 | /* Create thread to dispatch registration */ |
4656 | ret = pthread_create(&dispatch_thread, NULL, | |
4657 | thread_dispatch_ust_registration, (void *) NULL); | |
4658 | if (ret != 0) { | |
76d7553f | 4659 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4660 | goto exit_dispatch; |
4661 | } | |
4662 | ||
4663 | /* Create thread to manage application registration. */ | |
4664 | ret = pthread_create(®_apps_thread, NULL, | |
4665 | thread_registration_apps, (void *) NULL); | |
4666 | if (ret != 0) { | |
76d7553f | 4667 | PERROR("pthread_create registration"); |
099e26bd DG |
4668 | goto exit_reg_apps; |
4669 | } | |
4670 | ||
cf3af59e | 4671 | /* Create thread to manage application socket */ |
54d01ffb DG |
4672 | ret = pthread_create(&apps_thread, NULL, |
4673 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4674 | if (ret != 0) { |
d0b96690 DG |
4675 | PERROR("pthread_create apps"); |
4676 | goto exit_apps; | |
4677 | } | |
4678 | ||
4679 | /* Create thread to manage application notify socket */ | |
4680 | ret = pthread_create(&apps_notify_thread, NULL, | |
4681 | ust_thread_manage_notify, (void *) NULL); | |
4682 | if (ret != 0) { | |
76d7553f | 4683 | PERROR("pthread_create apps"); |
cf3af59e MD |
4684 | goto exit_apps; |
4685 | } | |
fac6795d | 4686 | |
6620da75 DG |
4687 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4688 | if (is_root && !opt_no_kernel) { | |
4689 | /* Create kernel thread to manage kernel event */ | |
4690 | ret = pthread_create(&kernel_thread, NULL, | |
4691 | thread_manage_kernel, (void *) NULL); | |
4692 | if (ret != 0) { | |
4693 | PERROR("pthread_create kernel"); | |
4694 | goto exit_kernel; | |
4695 | } | |
7a485870 | 4696 | |
6620da75 DG |
4697 | ret = pthread_join(kernel_thread, &status); |
4698 | if (ret != 0) { | |
4699 | PERROR("pthread_join"); | |
4700 | goto error; /* join error, exit without cleanup */ | |
4701 | } | |
fac6795d DG |
4702 | } |
4703 | ||
cf3af59e MD |
4704 | exit_kernel: |
4705 | ret = pthread_join(apps_thread, &status); | |
4706 | if (ret != 0) { | |
76d7553f | 4707 | PERROR("pthread_join"); |
cf3af59e MD |
4708 | goto error; /* join error, exit without cleanup */ |
4709 | } | |
fac6795d | 4710 | |
cf3af59e | 4711 | exit_apps: |
099e26bd DG |
4712 | ret = pthread_join(reg_apps_thread, &status); |
4713 | if (ret != 0) { | |
76d7553f | 4714 | PERROR("pthread_join"); |
099e26bd DG |
4715 | goto error; /* join error, exit without cleanup */ |
4716 | } | |
4717 | ||
4718 | exit_reg_apps: | |
4719 | ret = pthread_join(dispatch_thread, &status); | |
4720 | if (ret != 0) { | |
76d7553f | 4721 | PERROR("pthread_join"); |
099e26bd DG |
4722 | goto error; /* join error, exit without cleanup */ |
4723 | } | |
4724 | ||
4725 | exit_dispatch: | |
cf3af59e MD |
4726 | ret = pthread_join(client_thread, &status); |
4727 | if (ret != 0) { | |
76d7553f | 4728 | PERROR("pthread_join"); |
cf3af59e MD |
4729 | goto error; /* join error, exit without cleanup */ |
4730 | } | |
4731 | ||
3bd1e081 | 4732 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4733 | if (ret != 0) { |
76d7553f | 4734 | PERROR("join_consumer"); |
cf3af59e MD |
4735 | goto error; /* join error, exit without cleanup */ |
4736 | } | |
a88df331 | 4737 | |
06f525de DG |
4738 | ret = join_consumer_thread(&ustconsumer32_data); |
4739 | if (ret != 0) { | |
4740 | PERROR("join_consumer ust32"); | |
4741 | goto error; /* join error, exit without cleanup */ | |
4742 | } | |
4743 | ||
4744 | ret = join_consumer_thread(&ustconsumer64_data); | |
4745 | if (ret != 0) { | |
4746 | PERROR("join_consumer ust64"); | |
4747 | goto error; /* join error, exit without cleanup */ | |
4748 | } | |
4749 | ||
cf3af59e | 4750 | exit_client: |
06f525de DG |
4751 | ret = pthread_join(health_thread, &status); |
4752 | if (ret != 0) { | |
4753 | PERROR("pthread_join health thread"); | |
4754 | goto error; /* join error, exit without cleanup */ | |
4755 | } | |
4756 | ||
44a5e5eb | 4757 | exit_health: |
0b2dc8df MD |
4758 | ret = pthread_join(ht_cleanup_thread, &status); |
4759 | if (ret != 0) { | |
4760 | PERROR("pthread_join ht cleanup thread"); | |
4761 | goto error; /* join error, exit without cleanup */ | |
4762 | } | |
4763 | exit_ht_cleanup: | |
a88df331 | 4764 | exit: |
cf3af59e MD |
4765 | /* |
4766 | * cleanup() is called when no other thread is running. | |
4767 | */ | |
f6a9efaa | 4768 | rcu_thread_online(); |
cf3af59e | 4769 | cleanup(); |
f6a9efaa DG |
4770 | rcu_thread_offline(); |
4771 | rcu_unregister_thread(); | |
67e40797 | 4772 | if (!ret) { |
cf3af59e | 4773 | exit(EXIT_SUCCESS); |
67e40797 | 4774 | } |
cf3af59e | 4775 | error: |
5e16da05 | 4776 | exit(EXIT_FAILURE); |
fac6795d | 4777 | } |