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 | |
4e449f3f MD |
449 | /* |
450 | * Close the thread quit pipe. It has already done its job, | |
451 | * since we are now called. | |
452 | */ | |
2f77fc4b DG |
453 | utils_close_pipe(thread_quit_pipe); |
454 | ||
35f90c40 DG |
455 | /* |
456 | * If opt_pidfile is undefined, the default file will be wiped when | |
457 | * removing the rundir. | |
458 | */ | |
459 | if (opt_pidfile) { | |
460 | ret = remove(opt_pidfile); | |
461 | if (ret < 0) { | |
462 | PERROR("remove pidfile %s", opt_pidfile); | |
463 | } | |
464 | } | |
465 | ||
67e40797 DG |
466 | DBG("Removing %s directory", rundir); |
467 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
468 | if (ret < 0) { | |
469 | ERR("asprintf failed. Something is really wrong!"); | |
470 | } | |
5461b305 | 471 | |
67e40797 DG |
472 | /* Remove lttng run directory */ |
473 | ret = system(cmd); | |
474 | if (ret < 0) { | |
475 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 476 | } |
67e40797 | 477 | free(cmd); |
bd69add2 | 478 | free(rundir); |
5461b305 | 479 | |
99bab54f | 480 | DBG("Cleaning up all sessions"); |
fac6795d | 481 | |
b5541356 | 482 | /* Destroy session list mutex */ |
273ea72c DG |
483 | if (session_list_ptr != NULL) { |
484 | pthread_mutex_destroy(&session_list_ptr->lock); | |
485 | ||
486 | /* Cleanup ALL session */ | |
54d01ffb DG |
487 | cds_list_for_each_entry_safe(sess, stmp, |
488 | &session_list_ptr->head, list) { | |
2f77fc4b | 489 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
490 | } |
491 | } | |
492 | ||
099e26bd | 493 | DBG("Closing all UST sockets"); |
56fff090 | 494 | ust_app_clean_list(); |
7972aab2 | 495 | buffer_reg_destroy_registries(); |
099e26bd | 496 | |
4fba7219 DG |
497 | if (is_root && !opt_no_kernel) { |
498 | DBG2("Closing kernel fd"); | |
a4b35e07 | 499 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
500 | ret = close(kernel_tracer_fd); |
501 | if (ret) { | |
502 | PERROR("close"); | |
503 | } | |
a4b35e07 | 504 | } |
2f50c8a3 | 505 | DBG("Unloading kernel modules"); |
096102bd | 506 | modprobe_remove_lttng_all(); |
2f50c8a3 | 507 | } |
2f77fc4b | 508 | |
e975f9f8 DG |
509 | close_consumer_sockets(); |
510 | ||
421cb601 | 511 | /* <fun> */ |
f56a39af | 512 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
513 | "Matthew, BEET driven development works!%c[%dm", |
514 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
515 | /* </fun> */ | |
fac6795d DG |
516 | } |
517 | ||
e065084a | 518 | /* |
d063d709 | 519 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 520 | * |
d063d709 | 521 | * Return lttcomm error code. |
e065084a DG |
522 | */ |
523 | static int send_unix_sock(int sock, void *buf, size_t len) | |
524 | { | |
525 | /* Check valid length */ | |
c617c0c6 | 526 | if (len == 0) { |
e065084a DG |
527 | return -1; |
528 | } | |
529 | ||
530 | return lttcomm_send_unix_sock(sock, buf, len); | |
531 | } | |
532 | ||
5461b305 | 533 | /* |
d063d709 | 534 | * Free memory of a command context structure. |
5461b305 | 535 | */ |
a2fb29a5 | 536 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 537 | { |
a2fb29a5 DG |
538 | DBG("Clean command context structure"); |
539 | if (*cmd_ctx) { | |
540 | if ((*cmd_ctx)->llm) { | |
541 | free((*cmd_ctx)->llm); | |
5461b305 | 542 | } |
a2fb29a5 DG |
543 | if ((*cmd_ctx)->lsm) { |
544 | free((*cmd_ctx)->lsm); | |
5461b305 | 545 | } |
a2fb29a5 DG |
546 | free(*cmd_ctx); |
547 | *cmd_ctx = NULL; | |
5461b305 DG |
548 | } |
549 | } | |
550 | ||
fac6795d | 551 | /* |
0fdd1e2c | 552 | * Notify UST applications using the shm mmap futex. |
fac6795d | 553 | */ |
0fdd1e2c | 554 | static int notify_ust_apps(int active) |
fac6795d | 555 | { |
0fdd1e2c | 556 | char *wait_shm_mmap; |
fac6795d | 557 | |
0fdd1e2c | 558 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 559 | |
0fdd1e2c DG |
560 | /* See shm.c for this call implying mmap, shm and futex calls */ |
561 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
562 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
563 | goto error; |
564 | } | |
565 | ||
0fdd1e2c DG |
566 | /* Wake waiting process */ |
567 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
568 | ||
569 | /* Apps notified successfully */ | |
570 | return 0; | |
fac6795d DG |
571 | |
572 | error: | |
0fdd1e2c | 573 | return -1; |
fac6795d DG |
574 | } |
575 | ||
e065084a | 576 | /* |
d063d709 DG |
577 | * Setup the outgoing data buffer for the response (llm) by allocating the |
578 | * right amount of memory and copying the original information from the lsm | |
579 | * structure. | |
ca95a216 | 580 | * |
d063d709 | 581 | * Return total size of the buffer pointed by buf. |
ca95a216 | 582 | */ |
5461b305 | 583 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 584 | { |
f3ed775e | 585 | int ret, buf_size; |
ca95a216 | 586 | |
f3ed775e | 587 | buf_size = size; |
5461b305 | 588 | |
ba7f0ae5 | 589 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 590 | if (cmd_ctx->llm == NULL) { |
76d7553f | 591 | PERROR("zmalloc"); |
5461b305 | 592 | ret = -ENOMEM; |
ca95a216 DG |
593 | goto error; |
594 | } | |
595 | ||
5461b305 DG |
596 | /* Copy common data */ |
597 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 598 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 599 | |
5461b305 DG |
600 | cmd_ctx->llm->data_size = size; |
601 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
602 | ||
ca95a216 DG |
603 | return buf_size; |
604 | ||
605 | error: | |
606 | return ret; | |
607 | } | |
608 | ||
7a485870 | 609 | /* |
5eb91c98 | 610 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 611 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 612 | */ |
5eb91c98 | 613 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 614 | { |
5eb91c98 | 615 | int ret; |
7a485870 DG |
616 | struct ltt_session *session; |
617 | struct ltt_kernel_channel *channel; | |
618 | ||
5eb91c98 | 619 | DBG("Updating kernel poll set"); |
7a485870 | 620 | |
54d01ffb | 621 | session_lock_list(); |
b5541356 | 622 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 623 | session_lock(session); |
7a485870 | 624 | if (session->kernel_session == NULL) { |
54d01ffb | 625 | session_unlock(session); |
7a485870 DG |
626 | continue; |
627 | } | |
7a485870 | 628 | |
54d01ffb DG |
629 | cds_list_for_each_entry(channel, |
630 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
631 | /* Add channel fd to the kernel poll set */ |
632 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
633 | if (ret < 0) { | |
54d01ffb | 634 | session_unlock(session); |
5eb91c98 DG |
635 | goto error; |
636 | } | |
637 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 638 | } |
54d01ffb | 639 | session_unlock(session); |
7a485870 | 640 | } |
54d01ffb | 641 | session_unlock_list(); |
7a485870 | 642 | |
5eb91c98 | 643 | return 0; |
7a485870 DG |
644 | |
645 | error: | |
54d01ffb | 646 | session_unlock_list(); |
7a485870 DG |
647 | return -1; |
648 | } | |
649 | ||
650 | /* | |
54d01ffb | 651 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 652 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 653 | * |
d063d709 | 654 | * Useful for CPU hotplug feature. |
7a485870 | 655 | */ |
2bdd86d4 | 656 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
657 | { |
658 | int ret = 0; | |
659 | struct ltt_session *session; | |
173af62f | 660 | struct ltt_kernel_session *ksess; |
7a485870 DG |
661 | struct ltt_kernel_channel *channel; |
662 | ||
663 | DBG("Updating kernel streams for channel fd %d", fd); | |
664 | ||
54d01ffb | 665 | session_lock_list(); |
b5541356 | 666 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 667 | session_lock(session); |
7a485870 | 668 | if (session->kernel_session == NULL) { |
54d01ffb | 669 | session_unlock(session); |
7a485870 DG |
670 | continue; |
671 | } | |
173af62f | 672 | ksess = session->kernel_session; |
d9800920 | 673 | |
173af62f | 674 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
675 | if (channel->fd == fd) { |
676 | DBG("Channel found, updating kernel streams"); | |
677 | ret = kernel_open_channel_stream(channel); | |
678 | if (ret < 0) { | |
b3c750d2 | 679 | goto error; |
7a485870 | 680 | } |
5c786ded JD |
681 | /* Update the stream global counter */ |
682 | ksess->stream_count_global += ret; | |
d9800920 | 683 | |
7a485870 | 684 | /* |
5eb91c98 DG |
685 | * Have we already sent fds to the consumer? If yes, it means |
686 | * that tracing is started so it is safe to send our updated | |
687 | * stream fds. | |
7a485870 | 688 | */ |
173af62f DG |
689 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
690 | struct lttng_ht_iter iter; | |
691 | struct consumer_socket *socket; | |
692 | ||
e7fe706f | 693 | rcu_read_lock(); |
173af62f DG |
694 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
695 | &iter.iter, socket, node.node) { | |
696 | /* Code flow error */ | |
697 | assert(socket->fd >= 0); | |
698 | ||
699 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 700 | ret = kernel_consumer_send_channel_stream(socket, |
2bba9e53 DG |
701 | channel, ksess, |
702 | session->output_traces ? 1 : 0); | |
173af62f DG |
703 | pthread_mutex_unlock(socket->lock); |
704 | if (ret < 0) { | |
e7fe706f | 705 | rcu_read_unlock(); |
173af62f DG |
706 | goto error; |
707 | } | |
7a485870 | 708 | } |
e7fe706f | 709 | rcu_read_unlock(); |
7a485870 | 710 | } |
b3c750d2 | 711 | goto error; |
7a485870 DG |
712 | } |
713 | } | |
54d01ffb | 714 | session_unlock(session); |
7a485870 | 715 | } |
54d01ffb | 716 | session_unlock_list(); |
b3c750d2 | 717 | return ret; |
7a485870 | 718 | |
b3c750d2 | 719 | error: |
54d01ffb DG |
720 | session_unlock(session); |
721 | session_unlock_list(); | |
7a485870 DG |
722 | return ret; |
723 | } | |
724 | ||
487cf67c | 725 | /* |
ffe60014 DG |
726 | * For each tracing session, update newly registered apps. The session list |
727 | * lock MUST be acquired before calling this. | |
487cf67c DG |
728 | */ |
729 | static void update_ust_app(int app_sock) | |
730 | { | |
731 | struct ltt_session *sess, *stmp; | |
732 | ||
733 | /* For all tracing session(s) */ | |
734 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 735 | session_lock(sess); |
421cb601 DG |
736 | if (sess->ust_session) { |
737 | ust_app_global_update(sess->ust_session, app_sock); | |
738 | } | |
4ee14516 | 739 | session_unlock(sess); |
487cf67c DG |
740 | } |
741 | } | |
742 | ||
7a485870 | 743 | /* |
d063d709 | 744 | * This thread manage event coming from the kernel. |
7a485870 | 745 | * |
d063d709 DG |
746 | * Features supported in this thread: |
747 | * -) CPU Hotplug | |
7a485870 DG |
748 | */ |
749 | static void *thread_manage_kernel(void *data) | |
750 | { | |
139ac872 | 751 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 752 | uint32_t revents, nb_fd; |
7a485870 | 753 | char tmp; |
5eb91c98 | 754 | struct lttng_poll_event events; |
7a485870 | 755 | |
6993eeb3 | 756 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 757 | |
927ca06a DG |
758 | health_register(HEALTH_TYPE_KERNEL); |
759 | ||
d5d63bf1 DG |
760 | /* |
761 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 762 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 763 | */ |
6d737ce4 | 764 | lttng_poll_init(&events); |
d5d63bf1 | 765 | |
6993eeb3 CB |
766 | if (testpoint(thread_manage_kernel)) { |
767 | goto error_testpoint; | |
768 | } | |
8ac94142 | 769 | |
840cb59c | 770 | health_code_update(); |
44a5e5eb | 771 | |
6993eeb3 | 772 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 773 | goto error_testpoint; |
6993eeb3 CB |
774 | } |
775 | ||
7a485870 | 776 | while (1) { |
840cb59c | 777 | health_code_update(); |
44a5e5eb | 778 | |
7a485870 | 779 | if (update_poll_flag == 1) { |
d21b0d71 DG |
780 | /* Clean events object. We are about to populate it again. */ |
781 | lttng_poll_clean(&events); | |
782 | ||
d0b96690 | 783 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
784 | if (ret < 0) { |
785 | goto error_poll_create; | |
786 | } | |
787 | ||
788 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
789 | if (ret < 0) { | |
790 | goto error; | |
791 | } | |
5f822d0a | 792 | |
d21b0d71 | 793 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
794 | ret = update_kernel_poll(&events); |
795 | if (ret < 0) { | |
7a485870 DG |
796 | goto error; |
797 | } | |
798 | update_poll_flag = 0; | |
799 | } | |
800 | ||
d21b0d71 | 801 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
802 | |
803 | /* Poll infinite value of time */ | |
88f2b785 | 804 | restart: |
a78af745 | 805 | health_poll_entry(); |
5eb91c98 | 806 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 807 | health_poll_exit(); |
7a485870 | 808 | if (ret < 0) { |
88f2b785 MD |
809 | /* |
810 | * Restart interrupted system call. | |
811 | */ | |
812 | if (errno == EINTR) { | |
813 | goto restart; | |
814 | } | |
7a485870 DG |
815 | goto error; |
816 | } else if (ret == 0) { | |
817 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
818 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
819 | "This should not have happened! Continuing..."); | |
7a485870 DG |
820 | continue; |
821 | } | |
822 | ||
0d9c5d77 DG |
823 | nb_fd = ret; |
824 | ||
5eb91c98 DG |
825 | for (i = 0; i < nb_fd; i++) { |
826 | /* Fetch once the poll data */ | |
827 | revents = LTTNG_POLL_GETEV(&events, i); | |
828 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 829 | |
840cb59c | 830 | health_code_update(); |
44a5e5eb | 831 | |
5eb91c98 | 832 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 833 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 834 | if (ret) { |
139ac872 MD |
835 | err = 0; |
836 | goto exit; | |
5eb91c98 | 837 | } |
7a485870 | 838 | |
5eb91c98 DG |
839 | /* Check for data on kernel pipe */ |
840 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
841 | do { |
842 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
843 | } while (ret < 0 && errno == EINTR); | |
844 | /* | |
845 | * Ret value is useless here, if this pipe gets any actions an | |
846 | * update is required anyway. | |
847 | */ | |
5eb91c98 DG |
848 | update_poll_flag = 1; |
849 | continue; | |
850 | } else { | |
851 | /* | |
852 | * New CPU detected by the kernel. Adding kernel stream to | |
853 | * kernel session and updating the kernel consumer | |
854 | */ | |
855 | if (revents & LPOLLIN) { | |
2bdd86d4 | 856 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
857 | if (ret < 0) { |
858 | continue; | |
859 | } | |
860 | break; | |
861 | /* | |
862 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
863 | * and unregister kernel stream at this point. | |
864 | */ | |
7a485870 | 865 | } |
7a485870 DG |
866 | } |
867 | } | |
868 | } | |
869 | ||
139ac872 | 870 | exit: |
7a485870 | 871 | error: |
5eb91c98 | 872 | lttng_poll_clean(&events); |
76d7553f | 873 | error_poll_create: |
6993eeb3 | 874 | error_testpoint: |
6620da75 DG |
875 | utils_close_pipe(kernel_poll_pipe); |
876 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 877 | if (err) { |
840cb59c | 878 | health_error(); |
139ac872 | 879 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
880 | WARN("Kernel thread died unexpectedly. " |
881 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 882 | } |
927ca06a | 883 | health_unregister(); |
76d7553f | 884 | DBG("Kernel thread dying"); |
7a485870 DG |
885 | return NULL; |
886 | } | |
887 | ||
a23ec3a7 DG |
888 | /* |
889 | * Signal pthread condition of the consumer data that the thread. | |
890 | */ | |
891 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
892 | { | |
893 | pthread_mutex_lock(&data->cond_mutex); | |
894 | ||
895 | /* | |
896 | * The state is set before signaling. It can be any value, it's the waiter | |
897 | * job to correctly interpret this condition variable associated to the | |
898 | * consumer pthread_cond. | |
899 | * | |
900 | * A value of 0 means that the corresponding thread of the consumer data | |
901 | * was not started. 1 indicates that the thread has started and is ready | |
902 | * for action. A negative value means that there was an error during the | |
903 | * thread bootstrap. | |
904 | */ | |
905 | data->consumer_thread_is_ready = state; | |
906 | (void) pthread_cond_signal(&data->cond); | |
907 | ||
908 | pthread_mutex_unlock(&data->cond_mutex); | |
909 | } | |
910 | ||
1d4b027a | 911 | /* |
3bd1e081 | 912 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 913 | */ |
3bd1e081 | 914 | static void *thread_manage_consumer(void *data) |
1d4b027a | 915 | { |
139ac872 | 916 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 917 | uint32_t revents, nb_fd; |
1d4b027a | 918 | enum lttcomm_return_code code; |
5eb91c98 | 919 | struct lttng_poll_event events; |
3bd1e081 | 920 | struct consumer_data *consumer_data = data; |
1d4b027a | 921 | |
3bd1e081 | 922 | DBG("[thread] Manage consumer started"); |
1d4b027a | 923 | |
927ca06a DG |
924 | health_register(HEALTH_TYPE_CONSUMER); |
925 | ||
855060f8 | 926 | health_code_update(); |
9449cc75 | 927 | |
5eb91c98 | 928 | /* |
331744e3 JD |
929 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
930 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 931 | */ |
331744e3 | 932 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 933 | if (ret < 0) { |
76d7553f | 934 | goto error_poll; |
5eb91c98 | 935 | } |
273ea72c | 936 | |
edb8b045 DG |
937 | /* |
938 | * The error socket here is already in a listening state which was done | |
939 | * just before spawning this thread to avoid a race between the consumer | |
940 | * daemon exec trying to connect and the listen() call. | |
941 | */ | |
3bd1e081 | 942 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
943 | if (ret < 0) { |
944 | goto error; | |
945 | } | |
946 | ||
840cb59c | 947 | health_code_update(); |
44a5e5eb | 948 | |
331744e3 | 949 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 950 | restart: |
a78af745 | 951 | health_poll_entry(); |
8ac94142 | 952 | |
6993eeb3 CB |
953 | if (testpoint(thread_manage_consumer)) { |
954 | goto error; | |
955 | } | |
8ac94142 | 956 | |
5eb91c98 | 957 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 958 | health_poll_exit(); |
273ea72c | 959 | if (ret < 0) { |
88f2b785 MD |
960 | /* |
961 | * Restart interrupted system call. | |
962 | */ | |
963 | if (errno == EINTR) { | |
964 | goto restart; | |
965 | } | |
273ea72c DG |
966 | goto error; |
967 | } | |
968 | ||
0d9c5d77 DG |
969 | nb_fd = ret; |
970 | ||
5eb91c98 DG |
971 | for (i = 0; i < nb_fd; i++) { |
972 | /* Fetch once the poll data */ | |
973 | revents = LTTNG_POLL_GETEV(&events, i); | |
974 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
975 | ||
840cb59c | 976 | health_code_update(); |
44a5e5eb | 977 | |
5eb91c98 | 978 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 979 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 980 | if (ret) { |
139ac872 MD |
981 | err = 0; |
982 | goto exit; | |
5eb91c98 DG |
983 | } |
984 | ||
985 | /* Event on the registration socket */ | |
3bd1e081 | 986 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 987 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 988 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
989 | goto error; |
990 | } | |
991 | } | |
273ea72c DG |
992 | } |
993 | ||
3bd1e081 | 994 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
995 | if (sock < 0) { |
996 | goto error; | |
997 | } | |
998 | ||
b662582b DG |
999 | /* |
1000 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1001 | * show must go on. | |
1002 | */ | |
1003 | (void) utils_set_fd_cloexec(sock); | |
1004 | ||
840cb59c | 1005 | health_code_update(); |
44a5e5eb | 1006 | |
3bd1e081 | 1007 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1008 | |
712ea556 | 1009 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1010 | ret = lttcomm_recv_unix_sock(sock, &code, |
1011 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1012 | if (ret <= 0) { |
1013 | goto error; | |
1014 | } | |
1015 | ||
840cb59c | 1016 | health_code_update(); |
44a5e5eb | 1017 | |
f73fabfd | 1018 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1019 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1020 | consumer_data->cmd_sock = |
1021 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
331744e3 JD |
1022 | consumer_data->metadata_sock.fd = |
1023 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
1024 | if (consumer_data->cmd_sock < 0 || | |
1025 | consumer_data->metadata_sock.fd < 0) { | |
1026 | PERROR("consumer connect cmd socket"); | |
a23ec3a7 DG |
1027 | /* On error, signal condition and quit. */ |
1028 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1029 | goto error; |
1030 | } | |
331744e3 JD |
1031 | /* Create metadata socket lock. */ |
1032 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1033 | if (consumer_data->metadata_sock.lock == NULL) { | |
1034 | PERROR("zmalloc pthread mutex"); | |
1035 | ret = -1; | |
1036 | goto error; | |
1037 | } | |
1038 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1039 | ||
a23ec3a7 | 1040 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1041 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1042 | DBG("Consumer metadata socket ready (fd: %d)", | |
1043 | consumer_data->metadata_sock.fd); | |
1d4b027a | 1044 | } else { |
3bd1e081 | 1045 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1046 | lttcomm_get_readable_code(-code)); |
1047 | goto error; | |
1048 | } | |
1049 | ||
331744e3 | 1050 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1051 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1052 | if (ret < 0) { |
72079cae DG |
1053 | goto error; |
1054 | } | |
1055 | ||
331744e3 | 1056 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1057 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1058 | if (ret < 0) { | |
72079cae | 1059 | goto error; |
5eb91c98 DG |
1060 | } |
1061 | ||
331744e3 JD |
1062 | /* Add metadata socket that is successfully connected. */ |
1063 | ret = lttng_poll_add(&events, consumer_data->metadata_sock.fd, | |
1064 | LPOLLIN | LPOLLRDHUP); | |
1065 | if (ret < 0) { | |
1066 | goto error; | |
1067 | } | |
1068 | ||
840cb59c | 1069 | health_code_update(); |
44a5e5eb | 1070 | |
331744e3 | 1071 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1072 | restart_poll: |
331744e3 JD |
1073 | while (1) { |
1074 | health_poll_entry(); | |
1075 | ret = lttng_poll_wait(&events, -1); | |
1076 | health_poll_exit(); | |
1077 | if (ret < 0) { | |
1078 | /* | |
1079 | * Restart interrupted system call. | |
1080 | */ | |
1081 | if (errno == EINTR) { | |
1082 | goto restart_poll; | |
1083 | } | |
1084 | goto error; | |
88f2b785 | 1085 | } |
72079cae | 1086 | |
331744e3 | 1087 | nb_fd = ret; |
0d9c5d77 | 1088 | |
331744e3 JD |
1089 | for (i = 0; i < nb_fd; i++) { |
1090 | /* Fetch once the poll data */ | |
1091 | revents = LTTNG_POLL_GETEV(&events, i); | |
1092 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1093 | |
331744e3 | 1094 | health_code_update(); |
44a5e5eb | 1095 | |
331744e3 JD |
1096 | /* Thread quit pipe has been closed. Killing thread. */ |
1097 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); | |
1098 | if (ret) { | |
1099 | err = 0; | |
1100 | goto exit; | |
1101 | } | |
5eb91c98 | 1102 | |
331744e3 JD |
1103 | if (pollfd == sock) { |
1104 | /* Event on the consumerd socket */ | |
1105 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1106 | ERR("consumer err socket second poll error"); | |
1107 | goto error; | |
1108 | } | |
1109 | health_code_update(); | |
1110 | /* Wait for any kconsumerd error */ | |
1111 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1112 | sizeof(enum lttcomm_return_code)); | |
1113 | if (ret <= 0) { | |
1114 | ERR("consumer closed the command socket"); | |
1115 | goto error; | |
1116 | } | |
1117 | ||
1118 | ERR("consumer return code : %s", | |
1119 | lttcomm_get_readable_code(-code)); | |
1120 | ||
1121 | goto exit; | |
1122 | } else if (pollfd == consumer_data->metadata_sock.fd) { | |
1123 | /* UST metadata requests */ | |
1124 | ret = ust_consumer_metadata_request( | |
1125 | &consumer_data->metadata_sock); | |
1126 | if (ret < 0) { | |
1127 | ERR("Handling metadata request"); | |
1128 | goto error; | |
1129 | } | |
1130 | break; | |
1131 | } else { | |
1132 | ERR("Unknown pollfd"); | |
5eb91c98 DG |
1133 | goto error; |
1134 | } | |
1135 | } | |
331744e3 | 1136 | health_code_update(); |
5eb91c98 DG |
1137 | } |
1138 | ||
139ac872 | 1139 | exit: |
1d4b027a | 1140 | error: |
5c827ce0 DG |
1141 | /* Immediately set the consumerd state to stopped */ |
1142 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1143 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1144 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1145 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1146 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1147 | } else { | |
1148 | /* Code flow error... */ | |
1149 | assert(0); | |
1150 | } | |
1151 | ||
76d7553f MD |
1152 | if (consumer_data->err_sock >= 0) { |
1153 | ret = close(consumer_data->err_sock); | |
1154 | if (ret) { | |
1155 | PERROR("close"); | |
1156 | } | |
a76cbd9f | 1157 | consumer_data->err_sock = -1; |
76d7553f MD |
1158 | } |
1159 | if (consumer_data->cmd_sock >= 0) { | |
1160 | ret = close(consumer_data->cmd_sock); | |
1161 | if (ret) { | |
1162 | PERROR("close"); | |
1163 | } | |
a76cbd9f | 1164 | consumer_data->cmd_sock = -1; |
76d7553f | 1165 | } |
331744e3 JD |
1166 | if (consumer_data->metadata_sock.fd >= 0) { |
1167 | ret = close(consumer_data->metadata_sock.fd); | |
1168 | if (ret) { | |
1169 | PERROR("close"); | |
1170 | } | |
1171 | } | |
1172 | /* Cleanup metadata socket mutex. */ | |
1173 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1174 | free(consumer_data->metadata_sock.lock); | |
1175 | ||
76d7553f MD |
1176 | if (sock >= 0) { |
1177 | ret = close(sock); | |
1178 | if (ret) { | |
1179 | PERROR("close"); | |
1180 | } | |
1181 | } | |
273ea72c | 1182 | |
3bd1e081 MD |
1183 | unlink(consumer_data->err_unix_sock_path); |
1184 | unlink(consumer_data->cmd_unix_sock_path); | |
1185 | consumer_data->pid = 0; | |
1d4b027a | 1186 | |
5eb91c98 | 1187 | lttng_poll_clean(&events); |
76d7553f | 1188 | error_poll: |
139ac872 | 1189 | if (err) { |
840cb59c | 1190 | health_error(); |
139ac872 MD |
1191 | ERR("Health error occurred in %s", __func__); |
1192 | } | |
927ca06a | 1193 | health_unregister(); |
76d7553f | 1194 | DBG("consumer thread cleanup completed"); |
0177d773 | 1195 | |
5eb91c98 | 1196 | return NULL; |
099e26bd DG |
1197 | } |
1198 | ||
099e26bd DG |
1199 | /* |
1200 | * This thread manage application communication. | |
1d4b027a DG |
1201 | */ |
1202 | static void *thread_manage_apps(void *data) | |
099e26bd | 1203 | { |
139ac872 | 1204 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1205 | uint32_t revents, nb_fd; |
5eb91c98 | 1206 | struct lttng_poll_event events; |
099e26bd DG |
1207 | |
1208 | DBG("[thread] Manage application started"); | |
1209 | ||
f6a9efaa DG |
1210 | rcu_register_thread(); |
1211 | rcu_thread_online(); | |
1212 | ||
927ca06a DG |
1213 | health_register(HEALTH_TYPE_APP_MANAGE); |
1214 | ||
6993eeb3 CB |
1215 | if (testpoint(thread_manage_apps)) { |
1216 | goto error_testpoint; | |
1217 | } | |
1218 | ||
840cb59c | 1219 | health_code_update(); |
44a5e5eb | 1220 | |
d0b96690 | 1221 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1222 | if (ret < 0) { |
76d7553f | 1223 | goto error_poll_create; |
5eb91c98 | 1224 | } |
099e26bd | 1225 | |
5eb91c98 DG |
1226 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1227 | if (ret < 0) { | |
1228 | goto error; | |
1229 | } | |
099e26bd | 1230 | |
6993eeb3 CB |
1231 | if (testpoint(thread_manage_apps_before_loop)) { |
1232 | goto error; | |
1233 | } | |
8ac94142 | 1234 | |
840cb59c | 1235 | health_code_update(); |
44a5e5eb | 1236 | |
5eb91c98 | 1237 | while (1) { |
d21b0d71 | 1238 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1239 | |
1240 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1241 | restart: |
a78af745 | 1242 | health_poll_entry(); |
5eb91c98 | 1243 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1244 | health_poll_exit(); |
099e26bd | 1245 | if (ret < 0) { |
88f2b785 MD |
1246 | /* |
1247 | * Restart interrupted system call. | |
1248 | */ | |
1249 | if (errno == EINTR) { | |
1250 | goto restart; | |
1251 | } | |
099e26bd DG |
1252 | goto error; |
1253 | } | |
1254 | ||
0d9c5d77 DG |
1255 | nb_fd = ret; |
1256 | ||
5eb91c98 DG |
1257 | for (i = 0; i < nb_fd; i++) { |
1258 | /* Fetch once the poll data */ | |
1259 | revents = LTTNG_POLL_GETEV(&events, i); | |
1260 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1261 | ||
840cb59c | 1262 | health_code_update(); |
44a5e5eb | 1263 | |
5eb91c98 | 1264 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1265 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1266 | if (ret) { |
139ac872 MD |
1267 | err = 0; |
1268 | goto exit; | |
5eb91c98 | 1269 | } |
099e26bd | 1270 | |
5eb91c98 DG |
1271 | /* Inspect the apps cmd pipe */ |
1272 | if (pollfd == apps_cmd_pipe[0]) { | |
1273 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1274 | ERR("Apps command pipe error"); | |
0177d773 | 1275 | goto error; |
5eb91c98 | 1276 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1277 | int sock; |
1278 | ||
5eb91c98 | 1279 | /* Empty pipe */ |
f921c78f | 1280 | do { |
d0b96690 | 1281 | ret = read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
f921c78f | 1282 | } while (ret < 0 && errno == EINTR); |
d0b96690 | 1283 | if (ret < 0 || ret < sizeof(sock)) { |
76d7553f | 1284 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1285 | goto error; |
1286 | } | |
099e26bd | 1287 | |
840cb59c | 1288 | health_code_update(); |
44a5e5eb | 1289 | |
ffe60014 | 1290 | /* |
d0b96690 DG |
1291 | * We only monitor the error events of the socket. This |
1292 | * thread does not handle any incoming data from UST | |
1293 | * (POLLIN). | |
ffe60014 | 1294 | */ |
d0b96690 DG |
1295 | ret = lttng_poll_add(&events, sock, |
1296 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1297 | if (ret < 0) { | |
5eb91c98 | 1298 | goto error; |
e0c7ec2b | 1299 | } |
acc7b41b | 1300 | |
783a3b9a MD |
1301 | /* |
1302 | * Set socket timeout for both receiving and ending. | |
1303 | * app_socket_timeout is in seconds, whereas | |
1304 | * lttcomm_setsockopt_rcv_timeout and | |
1305 | * lttcomm_setsockopt_snd_timeout expect msec as | |
1306 | * parameter. | |
1307 | */ | |
d0b96690 | 1308 | (void) lttcomm_setsockopt_rcv_timeout(sock, |
783a3b9a | 1309 | app_socket_timeout * 1000); |
d0b96690 | 1310 | (void) lttcomm_setsockopt_snd_timeout(sock, |
783a3b9a | 1311 | app_socket_timeout * 1000); |
ae9e45b3 | 1312 | |
d0b96690 | 1313 | DBG("Apps with sock %d added to poll set", sock); |
487cf67c | 1314 | |
840cb59c | 1315 | health_code_update(); |
44a5e5eb | 1316 | |
5eb91c98 | 1317 | break; |
0177d773 | 1318 | } |
5eb91c98 DG |
1319 | } else { |
1320 | /* | |
54d01ffb DG |
1321 | * At this point, we know that a registered application made |
1322 | * the event at poll_wait. | |
5eb91c98 DG |
1323 | */ |
1324 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1325 | /* Removing from the poll set */ | |
1326 | ret = lttng_poll_del(&events, pollfd); | |
1327 | if (ret < 0) { | |
1328 | goto error; | |
1329 | } | |
099e26bd | 1330 | |
b9d9b220 | 1331 | /* Socket closed on remote end. */ |
56fff090 | 1332 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1333 | break; |
1334 | } | |
099e26bd | 1335 | } |
44a5e5eb | 1336 | |
840cb59c | 1337 | health_code_update(); |
099e26bd | 1338 | } |
099e26bd DG |
1339 | } |
1340 | ||
139ac872 | 1341 | exit: |
099e26bd | 1342 | error: |
5eb91c98 | 1343 | lttng_poll_clean(&events); |
76d7553f | 1344 | error_poll_create: |
6993eeb3 | 1345 | error_testpoint: |
6620da75 DG |
1346 | utils_close_pipe(apps_cmd_pipe); |
1347 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1348 | ||
1349 | /* | |
1350 | * We don't clean the UST app hash table here since already registered | |
1351 | * applications can still be controlled so let them be until the session | |
1352 | * daemon dies or the applications stop. | |
1353 | */ | |
1354 | ||
139ac872 | 1355 | if (err) { |
840cb59c | 1356 | health_error(); |
139ac872 MD |
1357 | ERR("Health error occurred in %s", __func__); |
1358 | } | |
927ca06a | 1359 | health_unregister(); |
76d7553f | 1360 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1361 | rcu_thread_offline(); |
1362 | rcu_unregister_thread(); | |
099e26bd DG |
1363 | return NULL; |
1364 | } | |
1365 | ||
d0b96690 | 1366 | /* |
d88aee68 DG |
1367 | * Send a socket to a thread This is called from the dispatch UST registration |
1368 | * thread once all sockets are set for the application. | |
d0b96690 DG |
1369 | * |
1370 | * On success, return 0 else a negative value being the errno message of the | |
1371 | * write(). | |
1372 | */ | |
d88aee68 | 1373 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 DG |
1374 | { |
1375 | int ret; | |
1376 | ||
d0b96690 | 1377 | /* Sockets MUST be set or else this should not have been called. */ |
d88aee68 DG |
1378 | assert(fd >= 0); |
1379 | assert(sock >= 0); | |
d0b96690 DG |
1380 | |
1381 | do { | |
d88aee68 | 1382 | ret = write(fd, &sock, sizeof(sock)); |
d0b96690 | 1383 | } while (ret < 0 && errno == EINTR); |
d88aee68 DG |
1384 | if (ret < 0 || ret != sizeof(sock)) { |
1385 | PERROR("write apps pipe %d", fd); | |
d0b96690 DG |
1386 | if (ret < 0) { |
1387 | ret = -errno; | |
1388 | } | |
1389 | goto error; | |
1390 | } | |
1391 | ||
1392 | /* All good. Don't send back the write positive ret value. */ | |
1393 | ret = 0; | |
1394 | error: | |
1395 | return ret; | |
1396 | } | |
1397 | ||
f45e313d DG |
1398 | /* |
1399 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1400 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1401 | * notify socket is never received. | |
1402 | */ | |
1403 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1404 | { | |
1405 | int ret, nb_fd = 0, i; | |
1406 | unsigned int fd_added = 0; | |
1407 | struct lttng_poll_event events; | |
1408 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1409 | ||
1410 | assert(wait_queue); | |
1411 | ||
1412 | lttng_poll_init(&events); | |
1413 | ||
1414 | /* Just skip everything for an empty queue. */ | |
1415 | if (!wait_queue->count) { | |
1416 | goto end; | |
1417 | } | |
1418 | ||
1419 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1420 | if (ret < 0) { | |
1421 | goto error_create; | |
1422 | } | |
1423 | ||
1424 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1425 | &wait_queue->head, head) { | |
1426 | assert(wait_node->app); | |
1427 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1428 | LPOLLHUP | LPOLLERR); | |
1429 | if (ret < 0) { | |
1430 | goto error; | |
1431 | } | |
1432 | ||
1433 | fd_added = 1; | |
1434 | } | |
1435 | ||
1436 | if (!fd_added) { | |
1437 | goto end; | |
1438 | } | |
1439 | ||
1440 | /* | |
1441 | * Poll but don't block so we can quickly identify the faulty events and | |
1442 | * clean them afterwards from the wait queue. | |
1443 | */ | |
1444 | ret = lttng_poll_wait(&events, 0); | |
1445 | if (ret < 0) { | |
1446 | goto error; | |
1447 | } | |
1448 | nb_fd = ret; | |
1449 | ||
1450 | for (i = 0; i < nb_fd; i++) { | |
1451 | /* Get faulty FD. */ | |
1452 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1453 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1454 | ||
1455 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1456 | &wait_queue->head, head) { | |
1457 | if (pollfd == wait_node->app->sock && | |
1458 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1459 | cds_list_del(&wait_node->head); | |
1460 | wait_queue->count--; | |
1461 | ust_app_destroy(wait_node->app); | |
1462 | free(wait_node); | |
1463 | break; | |
1464 | } | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | if (nb_fd > 0) { | |
1469 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1470 | } | |
1471 | ||
1472 | end: | |
1473 | lttng_poll_clean(&events); | |
1474 | return; | |
1475 | ||
1476 | error: | |
1477 | lttng_poll_clean(&events); | |
1478 | error_create: | |
1479 | ERR("Unable to sanitize wait queue"); | |
1480 | return; | |
1481 | } | |
1482 | ||
099e26bd DG |
1483 | /* |
1484 | * Dispatch request from the registration threads to the application | |
1485 | * communication thread. | |
1486 | */ | |
1487 | static void *thread_dispatch_ust_registration(void *data) | |
1488 | { | |
12e2b881 | 1489 | int ret, err = -1; |
099e26bd DG |
1490 | struct cds_wfq_node *node; |
1491 | struct ust_command *ust_cmd = NULL; | |
f45e313d DG |
1492 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1493 | struct ust_reg_wait_queue wait_queue = { | |
1494 | .count = 0, | |
1495 | }; | |
d0b96690 | 1496 | |
12e2b881 MD |
1497 | health_register(HEALTH_TYPE_APP_REG_DISPATCH); |
1498 | ||
1499 | health_code_update(); | |
1500 | ||
f45e313d | 1501 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1502 | |
1503 | DBG("[thread] Dispatch UST command started"); | |
1504 | ||
26c9d55e | 1505 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1506 | health_code_update(); |
1507 | ||
099e26bd DG |
1508 | /* Atomically prepare the queue futex */ |
1509 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1510 | ||
1511 | do { | |
d0b96690 | 1512 | struct ust_app *app = NULL; |
7972aab2 | 1513 | ust_cmd = NULL; |
d0b96690 | 1514 | |
f45e313d DG |
1515 | /* |
1516 | * Make sure we don't have node(s) that have hung up before receiving | |
1517 | * the notify socket. This is to clean the list in order to avoid | |
1518 | * memory leaks from notify socket that are never seen. | |
1519 | */ | |
1520 | sanitize_wait_queue(&wait_queue); | |
1521 | ||
12e2b881 | 1522 | health_code_update(); |
099e26bd DG |
1523 | /* Dequeue command for registration */ |
1524 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1525 | if (node == NULL) { | |
00a17c97 | 1526 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1527 | /* Continue thread execution */ |
1528 | break; | |
1529 | } | |
1530 | ||
1531 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1532 | ||
2f50c8a3 DG |
1533 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1534 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1535 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1536 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1537 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1538 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1539 | |
1540 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1541 | wait_node = zmalloc(sizeof(*wait_node)); | |
1542 | if (!wait_node) { | |
1543 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1544 | ret = close(ust_cmd->sock); |
1545 | if (ret < 0) { | |
1546 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1547 | } | |
1548 | lttng_fd_put(1, LTTNG_FD_APPS); | |
7972aab2 | 1549 | free(ust_cmd); |
d0b96690 DG |
1550 | goto error; |
1551 | } | |
1552 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1553 | ||
1554 | /* Create application object if socket is CMD. */ | |
1555 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1556 | ust_cmd->sock); | |
1557 | if (!wait_node->app) { | |
1558 | ret = close(ust_cmd->sock); | |
1559 | if (ret < 0) { | |
1560 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1561 | } |
d88aee68 DG |
1562 | lttng_fd_put(1, LTTNG_FD_APPS); |
1563 | free(wait_node); | |
7972aab2 | 1564 | free(ust_cmd); |
d0b96690 DG |
1565 | continue; |
1566 | } | |
1567 | /* | |
1568 | * Add application to the wait queue so we can set the notify | |
1569 | * socket before putting this object in the global ht. | |
1570 | */ | |
f45e313d DG |
1571 | cds_list_add(&wait_node->head, &wait_queue.head); |
1572 | wait_queue.count++; | |
d0b96690 | 1573 | |
7972aab2 | 1574 | free(ust_cmd); |
d0b96690 DG |
1575 | /* |
1576 | * We have to continue here since we don't have the notify | |
1577 | * socket and the application MUST be added to the hash table | |
1578 | * only at that moment. | |
1579 | */ | |
1580 | continue; | |
1581 | } else { | |
1582 | /* | |
1583 | * Look for the application in the local wait queue and set the | |
1584 | * notify socket if found. | |
1585 | */ | |
d88aee68 | 1586 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1587 | &wait_queue.head, head) { |
12e2b881 | 1588 | health_code_update(); |
d0b96690 DG |
1589 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1590 | wait_node->app->notify_sock = ust_cmd->sock; | |
1591 | cds_list_del(&wait_node->head); | |
f45e313d | 1592 | wait_queue.count--; |
d0b96690 DG |
1593 | app = wait_node->app; |
1594 | free(wait_node); | |
1595 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1596 | break; | |
1597 | } | |
1598 | } | |
020d7f60 DG |
1599 | |
1600 | /* | |
1601 | * With no application at this stage the received socket is | |
1602 | * basically useless so close it before we free the cmd data | |
1603 | * structure for good. | |
1604 | */ | |
1605 | if (!app) { | |
1606 | ret = close(ust_cmd->sock); | |
1607 | if (ret < 0) { | |
1608 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1609 | } | |
1610 | lttng_fd_put(1, LTTNG_FD_APPS); | |
1611 | } | |
7972aab2 | 1612 | free(ust_cmd); |
d0b96690 DG |
1613 | } |
1614 | ||
1615 | if (app) { | |
d0b96690 DG |
1616 | /* |
1617 | * @session_lock_list | |
1618 | * | |
1619 | * Lock the global session list so from the register up to the | |
1620 | * registration done message, no thread can see the application | |
1621 | * and change its state. | |
1622 | */ | |
1623 | session_lock_list(); | |
1624 | rcu_read_lock(); | |
d88aee68 | 1625 | |
d0b96690 DG |
1626 | /* |
1627 | * Add application to the global hash table. This needs to be | |
1628 | * done before the update to the UST registry can locate the | |
1629 | * application. | |
1630 | */ | |
1631 | ust_app_add(app); | |
d88aee68 DG |
1632 | |
1633 | /* Set app version. This call will print an error if needed. */ | |
1634 | (void) ust_app_version(app); | |
1635 | ||
1636 | /* Send notify socket through the notify pipe. */ | |
1637 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1638 | app->notify_sock); | |
1639 | if (ret < 0) { | |
1640 | rcu_read_unlock(); | |
1641 | session_unlock_list(); | |
1642 | /* No notify thread, stop the UST tracing. */ | |
1643 | goto error; | |
6620da75 | 1644 | } |
d88aee68 | 1645 | |
d0b96690 DG |
1646 | /* |
1647 | * Update newly registered application with the tracing | |
1648 | * registry info already enabled information. | |
1649 | */ | |
1650 | update_ust_app(app->sock); | |
d88aee68 DG |
1651 | |
1652 | /* | |
1653 | * Don't care about return value. Let the manage apps threads | |
1654 | * handle app unregistration upon socket close. | |
1655 | */ | |
1656 | (void) ust_app_register_done(app->sock); | |
1657 | ||
1658 | /* | |
1659 | * Even if the application socket has been closed, send the app | |
1660 | * to the thread and unregistration will take place at that | |
1661 | * place. | |
1662 | */ | |
1663 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1664 | if (ret < 0) { |
d88aee68 DG |
1665 | rcu_read_unlock(); |
1666 | session_unlock_list(); | |
1667 | /* No apps. thread, stop the UST tracing. */ | |
1668 | goto error; | |
d0b96690 | 1669 | } |
d88aee68 | 1670 | |
d0b96690 DG |
1671 | rcu_read_unlock(); |
1672 | session_unlock_list(); | |
099e26bd | 1673 | } |
099e26bd DG |
1674 | } while (node != NULL); |
1675 | ||
12e2b881 | 1676 | health_poll_entry(); |
099e26bd DG |
1677 | /* Futex wait on queue. Blocking call on futex() */ |
1678 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1679 | health_poll_exit(); |
099e26bd | 1680 | } |
12e2b881 MD |
1681 | /* Normal exit, no error */ |
1682 | err = 0; | |
099e26bd DG |
1683 | |
1684 | error: | |
d88aee68 DG |
1685 | /* Clean up wait queue. */ |
1686 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1687 | &wait_queue.head, head) { |
d88aee68 | 1688 | cds_list_del(&wait_node->head); |
f45e313d | 1689 | wait_queue.count--; |
d88aee68 DG |
1690 | free(wait_node); |
1691 | } | |
1692 | ||
099e26bd | 1693 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1694 | if (err) { |
1695 | health_error(); | |
1696 | ERR("Health error occurred in %s", __func__); | |
1697 | } | |
1698 | health_unregister(); | |
099e26bd DG |
1699 | return NULL; |
1700 | } | |
1701 | ||
1702 | /* | |
1703 | * This thread manage application registration. | |
1704 | */ | |
1705 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1706 | { |
139ac872 | 1707 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1708 | uint32_t revents, nb_fd; |
1709 | struct lttng_poll_event events; | |
099e26bd DG |
1710 | /* |
1711 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1712 | * freed in the manage apps thread. | |
1713 | */ | |
1714 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1715 | |
099e26bd | 1716 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1717 | |
927ca06a DG |
1718 | health_register(HEALTH_TYPE_APP_REG); |
1719 | ||
6993eeb3 CB |
1720 | if (testpoint(thread_registration_apps)) { |
1721 | goto error_testpoint; | |
1722 | } | |
8ac94142 | 1723 | |
1d4b027a DG |
1724 | ret = lttcomm_listen_unix_sock(apps_sock); |
1725 | if (ret < 0) { | |
76d7553f | 1726 | goto error_listen; |
1d4b027a DG |
1727 | } |
1728 | ||
5eb91c98 DG |
1729 | /* |
1730 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1731 | * more will be added to this poll set. | |
1732 | */ | |
d0b96690 | 1733 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1734 | if (ret < 0) { |
76d7553f | 1735 | goto error_create_poll; |
5eb91c98 | 1736 | } |
273ea72c | 1737 | |
5eb91c98 DG |
1738 | /* Add the application registration socket */ |
1739 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1740 | if (ret < 0) { | |
76d7553f | 1741 | goto error_poll_add; |
5eb91c98 | 1742 | } |
273ea72c | 1743 | |
1d4b027a | 1744 | /* Notify all applications to register */ |
0fdd1e2c DG |
1745 | ret = notify_ust_apps(1); |
1746 | if (ret < 0) { | |
1747 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1748 | "Execution continues but there might be problem for already\n" |
1749 | "running applications that wishes to register."); | |
0fdd1e2c | 1750 | } |
1d4b027a DG |
1751 | |
1752 | while (1) { | |
1753 | DBG("Accepting application registration"); | |
273ea72c DG |
1754 | |
1755 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1756 | restart: |
a78af745 | 1757 | health_poll_entry(); |
5eb91c98 | 1758 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1759 | health_poll_exit(); |
273ea72c | 1760 | if (ret < 0) { |
88f2b785 MD |
1761 | /* |
1762 | * Restart interrupted system call. | |
1763 | */ | |
1764 | if (errno == EINTR) { | |
1765 | goto restart; | |
1766 | } | |
273ea72c DG |
1767 | goto error; |
1768 | } | |
1769 | ||
0d9c5d77 DG |
1770 | nb_fd = ret; |
1771 | ||
5eb91c98 | 1772 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1773 | health_code_update(); |
139ac872 | 1774 | |
5eb91c98 DG |
1775 | /* Fetch once the poll data */ |
1776 | revents = LTTNG_POLL_GETEV(&events, i); | |
1777 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1778 | |
5eb91c98 | 1779 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1780 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1781 | if (ret) { |
139ac872 MD |
1782 | err = 0; |
1783 | goto exit; | |
90014c57 | 1784 | } |
1d4b027a | 1785 | |
5eb91c98 DG |
1786 | /* Event on the registration socket */ |
1787 | if (pollfd == apps_sock) { | |
1788 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1789 | ERR("Register apps socket poll error"); | |
1790 | goto error; | |
1791 | } else if (revents & LPOLLIN) { | |
1792 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1793 | if (sock < 0) { | |
1794 | goto error; | |
1795 | } | |
099e26bd | 1796 | |
b662582b DG |
1797 | /* |
1798 | * Set the CLOEXEC flag. Return code is useless because | |
1799 | * either way, the show must go on. | |
1800 | */ | |
1801 | (void) utils_set_fd_cloexec(sock); | |
1802 | ||
5eb91c98 | 1803 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1804 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1805 | if (ust_cmd == NULL) { |
76d7553f | 1806 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1807 | goto error; |
1808 | } | |
1d4b027a | 1809 | |
5eb91c98 DG |
1810 | /* |
1811 | * Using message-based transmissions to ensure we don't | |
1812 | * have to deal with partially received messages. | |
1813 | */ | |
4063050c MD |
1814 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1815 | if (ret < 0) { | |
1816 | ERR("Exhausted file descriptors allowed for applications."); | |
1817 | free(ust_cmd); | |
1818 | ret = close(sock); | |
1819 | if (ret) { | |
1820 | PERROR("close"); | |
1821 | } | |
1822 | sock = -1; | |
1823 | continue; | |
1824 | } | |
d88aee68 | 1825 | |
840cb59c | 1826 | health_code_update(); |
d0b96690 DG |
1827 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1828 | if (ret < 0) { | |
5eb91c98 | 1829 | free(ust_cmd); |
d0b96690 | 1830 | /* Close socket of the application. */ |
76d7553f MD |
1831 | ret = close(sock); |
1832 | if (ret) { | |
1833 | PERROR("close"); | |
1834 | } | |
4063050c | 1835 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1836 | sock = -1; |
5eb91c98 DG |
1837 | continue; |
1838 | } | |
840cb59c | 1839 | health_code_update(); |
099e26bd | 1840 | |
5eb91c98 | 1841 | ust_cmd->sock = sock; |
34a2494f | 1842 | sock = -1; |
099e26bd | 1843 | |
5eb91c98 DG |
1844 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1845 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1846 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1847 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1848 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1849 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1850 | |
5eb91c98 DG |
1851 | /* |
1852 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1853 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1854 | */ |
1855 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1856 | ||
1857 | /* | |
1858 | * Wake the registration queue futex. Implicit memory | |
1859 | * barrier with the exchange in cds_wfq_enqueue. | |
1860 | */ | |
1861 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1862 | } | |
1863 | } | |
90014c57 | 1864 | } |
1d4b027a DG |
1865 | } |
1866 | ||
139ac872 | 1867 | exit: |
1d4b027a | 1868 | error: |
139ac872 | 1869 | if (err) { |
840cb59c | 1870 | health_error(); |
139ac872 MD |
1871 | ERR("Health error occurred in %s", __func__); |
1872 | } | |
139ac872 | 1873 | |
0fdd1e2c DG |
1874 | /* Notify that the registration thread is gone */ |
1875 | notify_ust_apps(0); | |
1876 | ||
a4b35e07 | 1877 | if (apps_sock >= 0) { |
76d7553f MD |
1878 | ret = close(apps_sock); |
1879 | if (ret) { | |
1880 | PERROR("close"); | |
1881 | } | |
a4b35e07 | 1882 | } |
46c3f085 | 1883 | if (sock >= 0) { |
76d7553f MD |
1884 | ret = close(sock); |
1885 | if (ret) { | |
1886 | PERROR("close"); | |
1887 | } | |
4063050c | 1888 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1889 | } |
273ea72c | 1890 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1891 | |
76d7553f | 1892 | error_poll_add: |
5eb91c98 | 1893 | lttng_poll_clean(&events); |
76d7553f MD |
1894 | error_listen: |
1895 | error_create_poll: | |
6993eeb3 | 1896 | error_testpoint: |
76d7553f | 1897 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1898 | health_unregister(); |
5eb91c98 | 1899 | |
1d4b027a DG |
1900 | return NULL; |
1901 | } | |
1902 | ||
8c0faa1d | 1903 | /* |
3bd1e081 | 1904 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1905 | * exec or it will fails. |
8c0faa1d | 1906 | */ |
3bd1e081 | 1907 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1908 | { |
a23ec3a7 | 1909 | int ret, clock_ret; |
ee0b0061 DG |
1910 | struct timespec timeout; |
1911 | ||
a23ec3a7 DG |
1912 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1913 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1914 | |
a23ec3a7 DG |
1915 | /* Setup pthread condition */ |
1916 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1917 | if (ret != 0) { | |
1918 | errno = ret; | |
1919 | PERROR("pthread_condattr_init consumer data"); | |
1920 | goto error; | |
1921 | } | |
1922 | ||
1923 | /* | |
1924 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1925 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1926 | * for a more details and how we noticed it. | |
1927 | */ | |
1928 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1929 | if (ret != 0) { | |
1930 | errno = ret; | |
1931 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1932 | goto error; |
1933 | } | |
8c0faa1d | 1934 | |
a23ec3a7 DG |
1935 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1936 | if (ret != 0) { | |
1937 | errno = ret; | |
1938 | PERROR("pthread_cond_init consumer data"); | |
1939 | goto error; | |
1940 | } | |
1941 | ||
1942 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1943 | consumer_data); | |
8c0faa1d | 1944 | if (ret != 0) { |
3bd1e081 | 1945 | PERROR("pthread_create consumer"); |
ee0b0061 | 1946 | ret = -1; |
8c0faa1d DG |
1947 | goto error; |
1948 | } | |
1949 | ||
a23ec3a7 DG |
1950 | /* We are about to wait on a pthread condition */ |
1951 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1952 | ||
ee0b0061 | 1953 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1954 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1955 | /* | |
1956 | * Set the timeout for the condition timed wait even if the clock gettime | |
1957 | * call fails since we might loop on that call and we want to avoid to | |
1958 | * increment the timeout too many times. | |
1959 | */ | |
1960 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1961 | ||
1962 | /* | |
1963 | * The following loop COULD be skipped in some conditions so this is why we | |
1964 | * set ret to 0 in order to make sure at least one round of the loop is | |
1965 | * done. | |
1966 | */ | |
1967 | ret = 0; | |
1968 | ||
1969 | /* | |
1970 | * Loop until the condition is reached or when a timeout is reached. Note | |
1971 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1972 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1973 | * possible. This loop does not take any chances and works with both of | |
1974 | * them. | |
1975 | */ | |
1976 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1977 | if (clock_ret < 0) { | |
1978 | PERROR("clock_gettime spawn consumer"); | |
1979 | /* Infinite wait for the consumerd thread to be ready */ | |
1980 | ret = pthread_cond_wait(&consumer_data->cond, | |
1981 | &consumer_data->cond_mutex); | |
1982 | } else { | |
1983 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1984 | &consumer_data->cond_mutex, &timeout); | |
1985 | } | |
ee0b0061 | 1986 | } |
8c0faa1d | 1987 | |
a23ec3a7 DG |
1988 | /* Release the pthread condition */ |
1989 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1990 | ||
1991 | if (ret != 0) { | |
1992 | errno = ret; | |
1993 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1994 | /* |
1995 | * Call has timed out so we kill the kconsumerd_thread and return | |
1996 | * an error. | |
1997 | */ | |
a23ec3a7 DG |
1998 | ERR("Condition timed out. The consumer thread was never ready." |
1999 | " Killing it"); | |
3bd1e081 | 2000 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 2001 | if (ret < 0) { |
3bd1e081 | 2002 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2003 | } |
2004 | } else { | |
a23ec3a7 | 2005 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
2006 | } |
2007 | goto error; | |
2008 | } | |
2009 | ||
3bd1e081 MD |
2010 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2011 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2012 | ERR("Consumerd did not start"); |
3bd1e081 | 2013 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2014 | goto error; |
2015 | } | |
3bd1e081 | 2016 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2017 | |
8c0faa1d DG |
2018 | return 0; |
2019 | ||
2020 | error: | |
2021 | return ret; | |
2022 | } | |
2023 | ||
d9800920 | 2024 | /* |
3bd1e081 | 2025 | * Join consumer thread |
d9800920 | 2026 | */ |
3bd1e081 | 2027 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2028 | { |
2029 | void *status; | |
cf3af59e | 2030 | |
e8209f6b DG |
2031 | /* Consumer pid must be a real one. */ |
2032 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2033 | int ret; |
3bd1e081 | 2034 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2035 | if (ret) { |
3bd1e081 | 2036 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
2037 | return ret; |
2038 | } | |
3bd1e081 | 2039 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2040 | } else { |
2041 | return 0; | |
2042 | } | |
2043 | } | |
2044 | ||
8c0faa1d | 2045 | /* |
3bd1e081 | 2046 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2047 | * |
d063d709 | 2048 | * Return pid if successful else -1. |
8c0faa1d | 2049 | */ |
3bd1e081 | 2050 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2051 | { |
2052 | int ret; | |
2053 | pid_t pid; | |
94c55f17 | 2054 | const char *consumer_to_use; |
53086306 | 2055 | const char *verbosity; |
94c55f17 | 2056 | struct stat st; |
8c0faa1d | 2057 | |
3bd1e081 | 2058 | DBG("Spawning consumerd"); |
c49dc785 | 2059 | |
8c0faa1d DG |
2060 | pid = fork(); |
2061 | if (pid == 0) { | |
2062 | /* | |
3bd1e081 | 2063 | * Exec consumerd. |
8c0faa1d | 2064 | */ |
daee5345 | 2065 | if (opt_verbose_consumer) { |
53086306 DG |
2066 | verbosity = "--verbose"; |
2067 | } else { | |
2068 | verbosity = "--quiet"; | |
2069 | } | |
3bd1e081 MD |
2070 | switch (consumer_data->type) { |
2071 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2072 | /* |
c7704d57 DG |
2073 | * Find out which consumerd to execute. We will first try the |
2074 | * 64-bit path, then the sessiond's installation directory, and | |
2075 | * fallback on the 32-bit one, | |
94c55f17 | 2076 | */ |
63a799e8 AM |
2077 | DBG3("Looking for a kernel consumer at these locations:"); |
2078 | DBG3(" 1) %s", consumerd64_bin); | |
2079 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2080 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2081 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2082 | DBG3("Found location #1"); |
94c55f17 | 2083 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2084 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2085 | DBG3("Found location #2"); |
94c55f17 | 2086 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2087 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2088 | DBG3("Found location #3"); |
eb1e0bd4 | 2089 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2090 | } else { |
63a799e8 | 2091 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
2092 | break; |
2093 | } | |
2094 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
2095 | execl(consumer_to_use, | |
2096 | "lttng-consumerd", verbosity, "-k", | |
2097 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2098 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2099 | NULL); | |
3bd1e081 | 2100 | break; |
7753dea8 MD |
2101 | case LTTNG_CONSUMER64_UST: |
2102 | { | |
b1e0b6b6 | 2103 | char *tmpnew = NULL; |
8f4905da MD |
2104 | |
2105 | if (consumerd64_libdir[0] != '\0') { | |
2106 | char *tmp; | |
2107 | size_t tmplen; | |
2108 | ||
2109 | tmp = getenv("LD_LIBRARY_PATH"); | |
2110 | if (!tmp) { | |
2111 | tmp = ""; | |
2112 | } | |
2113 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2114 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2115 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2116 | if (!tmpnew) { | |
2117 | ret = -ENOMEM; | |
2118 | goto error; | |
2119 | } | |
2120 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2121 | strcat(tmpnew, consumerd64_libdir); | |
2122 | if (tmp[0] != '\0') { | |
2123 | strcat(tmpnew, ":"); | |
2124 | strcat(tmpnew, tmp); | |
2125 | } | |
2126 | ret = putenv(tmpnew); | |
2127 | if (ret) { | |
2128 | ret = -errno; | |
c6f76da9 | 2129 | free(tmpnew); |
8f4905da MD |
2130 | goto error; |
2131 | } | |
2132 | } | |
94c55f17 | 2133 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2134 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2135 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2136 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2137 | NULL); | |
8f4905da MD |
2138 | if (consumerd64_libdir[0] != '\0') { |
2139 | free(tmpnew); | |
2140 | } | |
2141 | if (ret) { | |
2142 | goto error; | |
2143 | } | |
3bd1e081 | 2144 | break; |
7753dea8 MD |
2145 | } |
2146 | case LTTNG_CONSUMER32_UST: | |
2147 | { | |
937dde8e | 2148 | char *tmpnew = NULL; |
8f4905da MD |
2149 | |
2150 | if (consumerd32_libdir[0] != '\0') { | |
2151 | char *tmp; | |
2152 | size_t tmplen; | |
2153 | ||
2154 | tmp = getenv("LD_LIBRARY_PATH"); | |
2155 | if (!tmp) { | |
2156 | tmp = ""; | |
2157 | } | |
2158 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2159 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2160 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2161 | if (!tmpnew) { | |
2162 | ret = -ENOMEM; | |
2163 | goto error; | |
2164 | } | |
2165 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2166 | strcat(tmpnew, consumerd32_libdir); | |
2167 | if (tmp[0] != '\0') { | |
2168 | strcat(tmpnew, ":"); | |
2169 | strcat(tmpnew, tmp); | |
2170 | } | |
2171 | ret = putenv(tmpnew); | |
2172 | if (ret) { | |
2173 | ret = -errno; | |
c6f76da9 | 2174 | free(tmpnew); |
8f4905da MD |
2175 | goto error; |
2176 | } | |
2177 | } | |
94c55f17 | 2178 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2179 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2180 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2181 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
2182 | NULL); | |
8f4905da MD |
2183 | if (consumerd32_libdir[0] != '\0') { |
2184 | free(tmpnew); | |
2185 | } | |
2186 | if (ret) { | |
2187 | goto error; | |
2188 | } | |
7753dea8 MD |
2189 | break; |
2190 | } | |
3bd1e081 | 2191 | default: |
76d7553f | 2192 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2193 | exit(EXIT_FAILURE); |
2194 | } | |
8c0faa1d | 2195 | if (errno != 0) { |
76d7553f | 2196 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
2197 | } |
2198 | exit(EXIT_FAILURE); | |
2199 | } else if (pid > 0) { | |
2200 | ret = pid; | |
8c0faa1d | 2201 | } else { |
76d7553f | 2202 | PERROR("start consumer fork"); |
8c0faa1d | 2203 | ret = -errno; |
8c0faa1d | 2204 | } |
8f4905da | 2205 | error: |
8c0faa1d DG |
2206 | return ret; |
2207 | } | |
2208 | ||
693bd40b | 2209 | /* |
3bd1e081 | 2210 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2211 | */ |
3bd1e081 | 2212 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2213 | { |
c617c0c6 | 2214 | int ret; |
edb8b045 DG |
2215 | |
2216 | /* | |
2217 | * Set the listen() state on the socket since there is a possible race | |
2218 | * between the exec() of the consumer daemon and this call if place in the | |
2219 | * consumer thread. See bug #366 for more details. | |
2220 | */ | |
2221 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2222 | if (ret < 0) { | |
2223 | goto error; | |
2224 | } | |
693bd40b | 2225 | |
3bd1e081 MD |
2226 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2227 | if (consumer_data->pid != 0) { | |
2228 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2229 | goto end; |
2230 | } | |
693bd40b | 2231 | |
3bd1e081 | 2232 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2233 | if (ret < 0) { |
3bd1e081 MD |
2234 | ERR("Spawning consumerd failed"); |
2235 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2236 | goto error; |
693bd40b | 2237 | } |
c49dc785 | 2238 | |
3bd1e081 MD |
2239 | /* Setting up the consumer_data pid */ |
2240 | consumer_data->pid = ret; | |
48842b30 | 2241 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2242 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2243 | |
3bd1e081 MD |
2244 | DBG2("Spawning consumer control thread"); |
2245 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2246 | if (ret < 0) { |
3bd1e081 | 2247 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2248 | goto error; |
2249 | } | |
2250 | ||
c49dc785 | 2251 | end: |
693bd40b DG |
2252 | return 0; |
2253 | ||
2254 | error: | |
331744e3 | 2255 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2256 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2257 | int err; |
2258 | ||
edb8b045 DG |
2259 | err = close(consumer_data->err_sock); |
2260 | if (err < 0) { | |
2261 | PERROR("close consumer data error socket"); | |
2262 | } | |
2263 | } | |
693bd40b DG |
2264 | return ret; |
2265 | } | |
2266 | ||
44a5e5eb | 2267 | /* |
139ac872 MD |
2268 | * Compute health status of each consumer. If one of them is zero (bad |
2269 | * state), we return 0. | |
44a5e5eb DG |
2270 | */ |
2271 | static int check_consumer_health(void) | |
2272 | { | |
2273 | int ret; | |
2274 | ||
927ca06a | 2275 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
2276 | |
2277 | DBG3("Health consumer check %d", ret); | |
2278 | ||
2279 | return ret; | |
2280 | } | |
2281 | ||
b73401da | 2282 | /* |
096102bd | 2283 | * Setup necessary data for kernel tracer action. |
b73401da | 2284 | */ |
096102bd | 2285 | static int init_kernel_tracer(void) |
b73401da DG |
2286 | { |
2287 | int ret; | |
b73401da | 2288 | |
096102bd DG |
2289 | /* Modprobe lttng kernel modules */ |
2290 | ret = modprobe_lttng_control(); | |
b73401da | 2291 | if (ret < 0) { |
b73401da DG |
2292 | goto error; |
2293 | } | |
2294 | ||
096102bd DG |
2295 | /* Open debugfs lttng */ |
2296 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2297 | if (kernel_tracer_fd < 0) { | |
2298 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2299 | ret = -1; |
2300 | goto error_open; | |
54d01ffb DG |
2301 | } |
2302 | ||
2f77fc4b DG |
2303 | /* Validate kernel version */ |
2304 | ret = kernel_validate_version(kernel_tracer_fd); | |
2305 | if (ret < 0) { | |
2306 | goto error_version; | |
b551a063 | 2307 | } |
54d01ffb | 2308 | |
2f77fc4b DG |
2309 | ret = modprobe_lttng_data(); |
2310 | if (ret < 0) { | |
2311 | goto error_modules; | |
54d01ffb DG |
2312 | } |
2313 | ||
2f77fc4b DG |
2314 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2315 | return 0; | |
2316 | ||
2317 | error_version: | |
2318 | modprobe_remove_lttng_control(); | |
2319 | ret = close(kernel_tracer_fd); | |
2320 | if (ret) { | |
2321 | PERROR("close"); | |
b551a063 | 2322 | } |
2f77fc4b | 2323 | kernel_tracer_fd = -1; |
f73fabfd | 2324 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2325 | |
2f77fc4b DG |
2326 | error_modules: |
2327 | ret = close(kernel_tracer_fd); | |
2328 | if (ret) { | |
2329 | PERROR("close"); | |
b551a063 | 2330 | } |
54d01ffb | 2331 | |
2f77fc4b DG |
2332 | error_open: |
2333 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2334 | |
2335 | error: | |
2f77fc4b DG |
2336 | WARN("No kernel tracer available"); |
2337 | kernel_tracer_fd = -1; | |
2338 | if (!is_root) { | |
f73fabfd | 2339 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2340 | } else { |
f73fabfd | 2341 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2342 | } |
54d01ffb DG |
2343 | } |
2344 | ||
2f77fc4b | 2345 | |
54d01ffb | 2346 | /* |
2f77fc4b DG |
2347 | * Copy consumer output from the tracing session to the domain session. The |
2348 | * function also applies the right modification on a per domain basis for the | |
2349 | * trace files destination directory. | |
36b588ed MD |
2350 | * |
2351 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2352 | */ |
2f77fc4b | 2353 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2354 | { |
2355 | int ret; | |
2f77fc4b DG |
2356 | const char *dir_name; |
2357 | struct consumer_output *consumer; | |
2358 | ||
2359 | assert(session); | |
2360 | assert(session->consumer); | |
54d01ffb | 2361 | |
b551a063 DG |
2362 | switch (domain) { |
2363 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2364 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2365 | /* |
2366 | * XXX: We should audit the session creation and what this function | |
2367 | * does "extra" in order to avoid a destroy since this function is used | |
2368 | * in the domain session creation (kernel and ust) only. Same for UST | |
2369 | * domain. | |
2370 | */ | |
2371 | if (session->kernel_session->consumer) { | |
2372 | consumer_destroy_output(session->kernel_session->consumer); | |
2373 | } | |
2f77fc4b DG |
2374 | session->kernel_session->consumer = |
2375 | consumer_copy_output(session->consumer); | |
2376 | /* Ease our life a bit for the next part */ | |
2377 | consumer = session->kernel_session->consumer; | |
2378 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2379 | break; |
2380 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2381 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2382 | if (session->ust_session->consumer) { |
2383 | consumer_destroy_output(session->ust_session->consumer); | |
2384 | } | |
2f77fc4b DG |
2385 | session->ust_session->consumer = |
2386 | consumer_copy_output(session->consumer); | |
2387 | /* Ease our life a bit for the next part */ | |
2388 | consumer = session->ust_session->consumer; | |
2389 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2390 | break; |
2391 | default: | |
f73fabfd | 2392 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2393 | goto error; |
2394 | } | |
2395 | ||
2f77fc4b | 2396 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2397 | strncat(consumer->subdir, dir_name, |
2398 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2399 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2400 | ||
f73fabfd | 2401 | ret = LTTNG_OK; |
54d01ffb DG |
2402 | |
2403 | error: | |
2404 | return ret; | |
2405 | } | |
2406 | ||
00e2e675 | 2407 | /* |
2f77fc4b | 2408 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2409 | * |
2410 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2411 | */ |
2f77fc4b DG |
2412 | static int create_ust_session(struct ltt_session *session, |
2413 | struct lttng_domain *domain) | |
00e2e675 DG |
2414 | { |
2415 | int ret; | |
2f77fc4b | 2416 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2417 | |
a4b92340 | 2418 | assert(session); |
2f77fc4b DG |
2419 | assert(domain); |
2420 | assert(session->consumer); | |
a4b92340 | 2421 | |
2f77fc4b DG |
2422 | switch (domain->type) { |
2423 | case LTTNG_DOMAIN_UST: | |
2424 | break; | |
2425 | default: | |
2426 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2427 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2428 | goto error; |
2429 | } | |
2430 | ||
2f77fc4b DG |
2431 | DBG("Creating UST session"); |
2432 | ||
dec56f6c | 2433 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2434 | if (lus == NULL) { |
f73fabfd | 2435 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2436 | goto error; |
2437 | } | |
2438 | ||
2f77fc4b DG |
2439 | lus->uid = session->uid; |
2440 | lus->gid = session->gid; | |
2bba9e53 | 2441 | lus->output_traces = session->output_traces; |
27babd3a | 2442 | lus->snapshot_mode = session->snapshot_mode; |
2f77fc4b | 2443 | session->ust_session = lus; |
00e2e675 | 2444 | |
2f77fc4b DG |
2445 | /* Copy session output to the newly created UST session */ |
2446 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2447 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2448 | goto error; |
2449 | } | |
2450 | ||
f73fabfd | 2451 | return LTTNG_OK; |
00e2e675 DG |
2452 | |
2453 | error: | |
2f77fc4b DG |
2454 | free(lus); |
2455 | session->ust_session = NULL; | |
00e2e675 DG |
2456 | return ret; |
2457 | } | |
2458 | ||
2459 | /* | |
2f77fc4b | 2460 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2461 | */ |
2f77fc4b | 2462 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2463 | { |
2464 | int ret; | |
a4b92340 | 2465 | |
2f77fc4b | 2466 | DBG("Creating kernel session"); |
00e2e675 | 2467 | |
2f77fc4b DG |
2468 | ret = kernel_create_session(session, kernel_tracer_fd); |
2469 | if (ret < 0) { | |
f73fabfd | 2470 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2471 | goto error; |
2472 | } | |
2473 | ||
2f77fc4b DG |
2474 | /* Code flow safety */ |
2475 | assert(session->kernel_session); | |
2476 | ||
2477 | /* Copy session output to the newly created Kernel session */ | |
2478 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2479 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2480 | goto error; |
2481 | } | |
2482 | ||
2f77fc4b DG |
2483 | /* Create directory(ies) on local filesystem. */ |
2484 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2485 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2486 | ret = run_as_mkdir_recursive( | |
2487 | session->kernel_session->consumer->dst.trace_path, | |
2488 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2489 | if (ret < 0) { | |
2490 | if (ret != -EEXIST) { | |
2491 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2492 | goto error; |
2493 | } | |
00e2e675 | 2494 | } |
2f77fc4b | 2495 | } |
00e2e675 | 2496 | |
2f77fc4b DG |
2497 | session->kernel_session->uid = session->uid; |
2498 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2499 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2500 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2501 | |
f73fabfd | 2502 | return LTTNG_OK; |
00e2e675 | 2503 | |
2f77fc4b DG |
2504 | error: |
2505 | trace_kernel_destroy_session(session->kernel_session); | |
2506 | session->kernel_session = NULL; | |
2507 | return ret; | |
2508 | } | |
00e2e675 | 2509 | |
2f77fc4b DG |
2510 | /* |
2511 | * Count number of session permitted by uid/gid. | |
2512 | */ | |
2513 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2514 | { | |
2515 | unsigned int i = 0; | |
2516 | struct ltt_session *session; | |
07424f16 | 2517 | |
2f77fc4b DG |
2518 | DBG("Counting number of available session for UID %d GID %d", |
2519 | uid, gid); | |
2520 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2521 | /* |
2f77fc4b | 2522 | * Only list the sessions the user can control. |
00e2e675 | 2523 | */ |
2f77fc4b DG |
2524 | if (!session_access_ok(session, uid, gid)) { |
2525 | continue; | |
2526 | } | |
2527 | i++; | |
a4b92340 | 2528 | } |
2f77fc4b | 2529 | return i; |
00e2e675 DG |
2530 | } |
2531 | ||
54d01ffb DG |
2532 | /* |
2533 | * Process the command requested by the lttng client within the command | |
2534 | * context structure. This function make sure that the return structure (llm) | |
2535 | * is set and ready for transmission before returning. | |
2536 | * | |
2537 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2538 | * |
2539 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2540 | * |
2541 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2542 | */ |
53a80697 MD |
2543 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2544 | int *sock_error) | |
54d01ffb | 2545 | { |
f73fabfd | 2546 | int ret = LTTNG_OK; |
44d3bd01 | 2547 | int need_tracing_session = 1; |
2e09ba09 | 2548 | int need_domain; |
54d01ffb DG |
2549 | |
2550 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2551 | ||
53a80697 MD |
2552 | *sock_error = 0; |
2553 | ||
2e09ba09 MD |
2554 | switch (cmd_ctx->lsm->cmd_type) { |
2555 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2556 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
2e09ba09 MD |
2557 | case LTTNG_DESTROY_SESSION: |
2558 | case LTTNG_LIST_SESSIONS: | |
2559 | case LTTNG_LIST_DOMAINS: | |
2560 | case LTTNG_START_TRACE: | |
2561 | case LTTNG_STOP_TRACE: | |
6d805429 | 2562 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2563 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2564 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2565 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2566 | case LTTNG_SNAPSHOT_RECORD: | |
2e09ba09 | 2567 | need_domain = 0; |
3aace903 | 2568 | break; |
2e09ba09 MD |
2569 | default: |
2570 | need_domain = 1; | |
2571 | } | |
2572 | ||
2573 | if (opt_no_kernel && need_domain | |
2574 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2575 | if (!is_root) { |
f73fabfd | 2576 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2577 | } else { |
f73fabfd | 2578 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2579 | } |
4fba7219 DG |
2580 | goto error; |
2581 | } | |
2582 | ||
8d3113b2 DG |
2583 | /* Deny register consumer if we already have a spawned consumer. */ |
2584 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2585 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2586 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2587 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2588 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2589 | goto error; |
2590 | } | |
2591 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2592 | } | |
2593 | ||
54d01ffb DG |
2594 | /* |
2595 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2596 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2597 | * command. |
2598 | */ | |
2599 | switch(cmd_ctx->lsm->cmd_type) { | |
2600 | case LTTNG_LIST_SESSIONS: | |
2601 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2602 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2603 | case LTTNG_LIST_DOMAINS: |
2604 | case LTTNG_LIST_CHANNELS: | |
2605 | case LTTNG_LIST_EVENTS: | |
2606 | break; | |
2607 | default: | |
2608 | /* Setup lttng message with no payload */ | |
2609 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2610 | if (ret < 0) { | |
2611 | /* This label does not try to unlock the session */ | |
2612 | goto init_setup_error; | |
2613 | } | |
2614 | } | |
2615 | ||
2616 | /* Commands that DO NOT need a session. */ | |
2617 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2618 | case LTTNG_CREATE_SESSION: |
27babd3a | 2619 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
2e09ba09 | 2620 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2621 | case LTTNG_LIST_SESSIONS: |
2622 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2623 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2624 | need_tracing_session = 0; |
54d01ffb DG |
2625 | break; |
2626 | default: | |
2627 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2628 | /* |
2629 | * We keep the session list lock across _all_ commands | |
2630 | * for now, because the per-session lock does not | |
2631 | * handle teardown properly. | |
2632 | */ | |
74babd95 | 2633 | session_lock_list(); |
54d01ffb DG |
2634 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2635 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2636 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2637 | goto error; |
2638 | } else { | |
2639 | /* Acquire lock for the session */ | |
2640 | session_lock(cmd_ctx->session); | |
2641 | } | |
2642 | break; | |
2643 | } | |
b389abbe | 2644 | |
2e09ba09 MD |
2645 | if (!need_domain) { |
2646 | goto skip_domain; | |
2647 | } | |
a4b92340 | 2648 | |
54d01ffb DG |
2649 | /* |
2650 | * Check domain type for specific "pre-action". | |
2651 | */ | |
2652 | switch (cmd_ctx->lsm->domain.type) { | |
2653 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2654 | if (!is_root) { |
f73fabfd | 2655 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2656 | goto error; |
2657 | } | |
2658 | ||
54d01ffb | 2659 | /* Kernel tracer check */ |
a4b35e07 | 2660 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2661 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2662 | ret = init_kernel_tracer(); |
2663 | if (ret != 0) { | |
54d01ffb DG |
2664 | goto error; |
2665 | } | |
2666 | } | |
5eb91c98 | 2667 | |
5c827ce0 DG |
2668 | /* Consumer is in an ERROR state. Report back to client */ |
2669 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2670 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2671 | goto error; |
2672 | } | |
2673 | ||
54d01ffb | 2674 | /* Need a session for kernel command */ |
44d3bd01 | 2675 | if (need_tracing_session) { |
54d01ffb | 2676 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2677 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2678 | if (ret < 0) { |
f73fabfd | 2679 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2680 | goto error; |
2681 | } | |
b389abbe | 2682 | } |
7d29a247 | 2683 | |
54d01ffb | 2684 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2685 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2686 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2687 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2688 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2689 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2690 | if (ret < 0) { |
f73fabfd | 2691 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2692 | goto error; |
950131af | 2693 | } |
5c827ce0 | 2694 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2695 | } else { |
2696 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2697 | } |
173af62f | 2698 | |
a4b92340 DG |
2699 | /* |
2700 | * The consumer was just spawned so we need to add the socket to | |
2701 | * the consumer output of the session if exist. | |
2702 | */ | |
2703 | ret = consumer_create_socket(&kconsumer_data, | |
2704 | cmd_ctx->session->kernel_session->consumer); | |
2705 | if (ret < 0) { | |
2706 | goto error; | |
173af62f | 2707 | } |
0d0c377a | 2708 | } |
5c827ce0 | 2709 | |
54d01ffb | 2710 | break; |
2bdd86d4 | 2711 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2712 | { |
5c827ce0 DG |
2713 | /* Consumer is in an ERROR state. Report back to client */ |
2714 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2715 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2716 | goto error; |
2717 | } | |
2718 | ||
44d3bd01 | 2719 | if (need_tracing_session) { |
a4b92340 | 2720 | /* Create UST session if none exist. */ |
f6a9efaa | 2721 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2722 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2723 | &cmd_ctx->lsm->domain); |
f73fabfd | 2724 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2725 | goto error; |
2726 | } | |
2727 | } | |
00e2e675 | 2728 | |
7753dea8 MD |
2729 | /* Start the UST consumer daemons */ |
2730 | /* 64-bit */ | |
2731 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2732 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2733 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2734 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2735 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2736 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2737 | if (ret < 0) { |
f73fabfd | 2738 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2739 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2740 | goto error; |
2741 | } | |
48842b30 | 2742 | |
173af62f | 2743 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2744 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2745 | } else { |
7753dea8 MD |
2746 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2747 | } | |
173af62f DG |
2748 | |
2749 | /* | |
2750 | * Setup socket for consumer 64 bit. No need for atomic access | |
2751 | * since it was set above and can ONLY be set in this thread. | |
2752 | */ | |
a4b92340 DG |
2753 | ret = consumer_create_socket(&ustconsumer64_data, |
2754 | cmd_ctx->session->ust_session->consumer); | |
2755 | if (ret < 0) { | |
2756 | goto error; | |
173af62f DG |
2757 | } |
2758 | ||
7753dea8 | 2759 | /* 32-bit */ |
fc7a59ce | 2760 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2761 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2762 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2763 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2764 | ret = start_consumerd(&ustconsumer32_data); | |
2765 | if (ret < 0) { | |
f73fabfd | 2766 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2767 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2768 | goto error; |
2769 | } | |
5c827ce0 | 2770 | |
173af62f | 2771 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2772 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2773 | } else { |
2774 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2775 | } |
173af62f DG |
2776 | |
2777 | /* | |
2778 | * Setup socket for consumer 64 bit. No need for atomic access | |
2779 | * since it was set above and can ONLY be set in this thread. | |
2780 | */ | |
a4b92340 DG |
2781 | ret = consumer_create_socket(&ustconsumer32_data, |
2782 | cmd_ctx->session->ust_session->consumer); | |
2783 | if (ret < 0) { | |
2784 | goto error; | |
173af62f | 2785 | } |
44d3bd01 DG |
2786 | } |
2787 | break; | |
48842b30 | 2788 | } |
54d01ffb | 2789 | default: |
54d01ffb DG |
2790 | break; |
2791 | } | |
2e09ba09 | 2792 | skip_domain: |
33a2b854 | 2793 | |
5c827ce0 DG |
2794 | /* Validate consumer daemon state when start/stop trace command */ |
2795 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2796 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2797 | switch (cmd_ctx->lsm->domain.type) { | |
2798 | case LTTNG_DOMAIN_UST: | |
2799 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2800 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2801 | goto error; |
2802 | } | |
2803 | break; | |
2804 | case LTTNG_DOMAIN_KERNEL: | |
2805 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2806 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2807 | goto error; |
2808 | } | |
2809 | break; | |
2810 | } | |
2811 | } | |
2812 | ||
8e0af1b4 MD |
2813 | /* |
2814 | * Check that the UID or GID match that of the tracing session. | |
2815 | * The root user can interact with all sessions. | |
2816 | */ | |
2817 | if (need_tracing_session) { | |
2818 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2819 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2820 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2821 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2822 | goto error; |
2823 | } | |
2824 | } | |
2825 | ||
ffe60014 DG |
2826 | /* |
2827 | * Send relayd information to consumer as soon as we have a domain and a | |
2828 | * session defined. | |
2829 | */ | |
2830 | if (cmd_ctx->session && need_domain) { | |
2831 | /* | |
2832 | * Setup relayd if not done yet. If the relayd information was already | |
2833 | * sent to the consumer, this call will gracefully return. | |
2834 | */ | |
2835 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2836 | if (ret != LTTNG_OK) { | |
2837 | goto error; | |
2838 | } | |
2839 | } | |
2840 | ||
54d01ffb DG |
2841 | /* Process by command type */ |
2842 | switch (cmd_ctx->lsm->cmd_type) { | |
2843 | case LTTNG_ADD_CONTEXT: | |
2844 | { | |
2845 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2846 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2847 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2848 | break; |
2849 | } | |
2850 | case LTTNG_DISABLE_CHANNEL: | |
2851 | { | |
2852 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2853 | cmd_ctx->lsm->u.disable.channel_name); | |
2854 | break; | |
2855 | } | |
2856 | case LTTNG_DISABLE_EVENT: | |
2857 | { | |
2858 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2859 | cmd_ctx->lsm->u.disable.channel_name, | |
2860 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2861 | break; |
2862 | } | |
54d01ffb DG |
2863 | case LTTNG_DISABLE_ALL_EVENT: |
2864 | { | |
2bdd86d4 | 2865 | DBG("Disabling all events"); |
54d01ffb DG |
2866 | |
2867 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2868 | cmd_ctx->lsm->u.disable.channel_name); | |
2869 | break; | |
2870 | } | |
2871 | case LTTNG_ENABLE_CHANNEL: | |
2872 | { | |
7972aab2 | 2873 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 2874 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2875 | break; |
2876 | } | |
2877 | case LTTNG_ENABLE_EVENT: | |
2878 | { | |
7972aab2 | 2879 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb | 2880 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2881 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2882 | break; |
2883 | } | |
2884 | case LTTNG_ENABLE_ALL_EVENT: | |
2885 | { | |
2bdd86d4 | 2886 | DBG("Enabling all events"); |
54d01ffb | 2887 | |
7972aab2 | 2888 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 2889 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2890 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2891 | break; |
2892 | } | |
052da939 | 2893 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2894 | { |
9f19cc17 | 2895 | struct lttng_event *events; |
54d01ffb | 2896 | ssize_t nb_events; |
052da939 | 2897 | |
54d01ffb DG |
2898 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2899 | if (nb_events < 0) { | |
f73fabfd | 2900 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2901 | ret = -nb_events; |
2902 | goto error; | |
2ef84c95 DG |
2903 | } |
2904 | ||
2905 | /* | |
2906 | * Setup lttng message with payload size set to the event list size in | |
2907 | * bytes and then copy list into the llm payload. | |
2908 | */ | |
052da939 | 2909 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2910 | if (ret < 0) { |
052da939 | 2911 | free(events); |
2ef84c95 DG |
2912 | goto setup_error; |
2913 | } | |
2914 | ||
2915 | /* Copy event list into message payload */ | |
9f19cc17 | 2916 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2917 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2918 | |
9f19cc17 | 2919 | free(events); |
2ef84c95 | 2920 | |
f73fabfd | 2921 | ret = LTTNG_OK; |
2ef84c95 DG |
2922 | break; |
2923 | } | |
f37d259d MD |
2924 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2925 | { | |
2926 | struct lttng_event_field *fields; | |
2927 | ssize_t nb_fields; | |
2928 | ||
a4b92340 DG |
2929 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2930 | &fields); | |
f37d259d | 2931 | if (nb_fields < 0) { |
f73fabfd | 2932 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2933 | ret = -nb_fields; |
2934 | goto error; | |
2935 | } | |
2936 | ||
2937 | /* | |
2938 | * Setup lttng message with payload size set to the event list size in | |
2939 | * bytes and then copy list into the llm payload. | |
2940 | */ | |
a4b92340 DG |
2941 | ret = setup_lttng_msg(cmd_ctx, |
2942 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2943 | if (ret < 0) { |
2944 | free(fields); | |
2945 | goto setup_error; | |
2946 | } | |
2947 | ||
2948 | /* Copy event list into message payload */ | |
2949 | memcpy(cmd_ctx->llm->payload, fields, | |
2950 | sizeof(struct lttng_event_field) * nb_fields); | |
2951 | ||
2952 | free(fields); | |
2953 | ||
f73fabfd | 2954 | ret = LTTNG_OK; |
f37d259d MD |
2955 | break; |
2956 | } | |
00e2e675 DG |
2957 | case LTTNG_SET_CONSUMER_URI: |
2958 | { | |
a4b92340 DG |
2959 | size_t nb_uri, len; |
2960 | struct lttng_uri *uris; | |
2961 | ||
2962 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2963 | len = nb_uri * sizeof(struct lttng_uri); | |
2964 | ||
2965 | if (nb_uri == 0) { | |
f73fabfd | 2966 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2967 | goto error; |
2968 | } | |
2969 | ||
2970 | uris = zmalloc(len); | |
2971 | if (uris == NULL) { | |
f73fabfd | 2972 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2973 | goto error; |
2974 | } | |
2975 | ||
2976 | /* Receive variable len data */ | |
77c7c900 | 2977 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2978 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2979 | if (ret <= 0) { | |
2980 | DBG("No URIs received from client... continuing"); | |
2981 | *sock_error = 1; | |
f73fabfd | 2982 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2983 | free(uris); |
a4b92340 DG |
2984 | goto error; |
2985 | } | |
2986 | ||
00e2e675 | 2987 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2988 | nb_uri, uris); |
f73fabfd | 2989 | if (ret != LTTNG_OK) { |
b1d41407 | 2990 | free(uris); |
a4b92340 DG |
2991 | goto error; |
2992 | } | |
2993 | ||
2994 | /* | |
2995 | * XXX: 0 means that this URI should be applied on the session. Should | |
2996 | * be a DOMAIN enuam. | |
2997 | */ | |
2998 | if (cmd_ctx->lsm->domain.type == 0) { | |
2999 | /* Add the URI for the UST session if a consumer is present. */ | |
3000 | if (cmd_ctx->session->ust_session && | |
3001 | cmd_ctx->session->ust_session->consumer) { | |
3002 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
3003 | nb_uri, uris); | |
3004 | } else if (cmd_ctx->session->kernel_session && | |
3005 | cmd_ctx->session->kernel_session->consumer) { | |
3006 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
3007 | cmd_ctx->session, nb_uri, uris); | |
3008 | } | |
3009 | } | |
3010 | ||
b1d41407 DG |
3011 | free(uris); |
3012 | ||
00e2e675 DG |
3013 | break; |
3014 | } | |
f3ed775e | 3015 | case LTTNG_START_TRACE: |
8c0faa1d | 3016 | { |
54d01ffb | 3017 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3018 | break; |
3019 | } | |
f3ed775e | 3020 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3021 | { |
54d01ffb | 3022 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3023 | break; |
3024 | } | |
5e16da05 MD |
3025 | case LTTNG_CREATE_SESSION: |
3026 | { | |
a4b92340 DG |
3027 | size_t nb_uri, len; |
3028 | struct lttng_uri *uris = NULL; | |
3029 | ||
3030 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3031 | len = nb_uri * sizeof(struct lttng_uri); | |
3032 | ||
3033 | if (nb_uri > 0) { | |
3034 | uris = zmalloc(len); | |
3035 | if (uris == NULL) { | |
f73fabfd | 3036 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3037 | goto error; |
3038 | } | |
3039 | ||
3040 | /* Receive variable len data */ | |
77c7c900 | 3041 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3042 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3043 | if (ret <= 0) { | |
3044 | DBG("No URIs received from client... continuing"); | |
3045 | *sock_error = 1; | |
f73fabfd | 3046 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3047 | free(uris); |
a4b92340 DG |
3048 | goto error; |
3049 | } | |
3050 | ||
3051 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3052 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3053 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3054 | free(uris); |
a4b92340 DG |
3055 | goto error; |
3056 | } | |
3057 | } | |
3058 | ||
3059 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
3060 | &cmd_ctx->creds); | |
3061 | ||
b1d41407 DG |
3062 | free(uris); |
3063 | ||
00e2e675 DG |
3064 | break; |
3065 | } | |
5e16da05 MD |
3066 | case LTTNG_DESTROY_SESSION: |
3067 | { | |
2f77fc4b | 3068 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3069 | |
3070 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3071 | cmd_ctx->session = NULL; |
5461b305 | 3072 | break; |
5e16da05 | 3073 | } |
9f19cc17 | 3074 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3075 | { |
54d01ffb DG |
3076 | ssize_t nb_dom; |
3077 | struct lttng_domain *domains; | |
5461b305 | 3078 | |
54d01ffb DG |
3079 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3080 | if (nb_dom < 0) { | |
f73fabfd | 3081 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3082 | ret = -nb_dom; |
3083 | goto error; | |
ce3d728c | 3084 | } |
520ff687 | 3085 | |
54d01ffb | 3086 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3087 | if (ret < 0) { |
ae9c20bc | 3088 | free(domains); |
5461b305 | 3089 | goto setup_error; |
520ff687 | 3090 | } |
57167058 | 3091 | |
54d01ffb DG |
3092 | /* Copy event list into message payload */ |
3093 | memcpy(cmd_ctx->llm->payload, domains, | |
3094 | nb_dom * sizeof(struct lttng_domain)); | |
3095 | ||
3096 | free(domains); | |
5e16da05 | 3097 | |
f73fabfd | 3098 | ret = LTTNG_OK; |
5e16da05 MD |
3099 | break; |
3100 | } | |
9f19cc17 | 3101 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3102 | { |
6775595e | 3103 | int nb_chan; |
54d01ffb DG |
3104 | struct lttng_channel *channels; |
3105 | ||
b551a063 DG |
3106 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3107 | cmd_ctx->session, &channels); | |
54d01ffb | 3108 | if (nb_chan < 0) { |
f73fabfd | 3109 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3110 | ret = -nb_chan; |
3111 | goto error; | |
5461b305 | 3112 | } |
ca95a216 | 3113 | |
54d01ffb | 3114 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3115 | if (ret < 0) { |
ae9c20bc | 3116 | free(channels); |
5461b305 DG |
3117 | goto setup_error; |
3118 | } | |
9f19cc17 | 3119 | |
54d01ffb DG |
3120 | /* Copy event list into message payload */ |
3121 | memcpy(cmd_ctx->llm->payload, channels, | |
3122 | nb_chan * sizeof(struct lttng_channel)); | |
3123 | ||
3124 | free(channels); | |
9f19cc17 | 3125 | |
f73fabfd | 3126 | ret = LTTNG_OK; |
5461b305 | 3127 | break; |
5e16da05 | 3128 | } |
9f19cc17 | 3129 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3130 | { |
b551a063 | 3131 | ssize_t nb_event; |
684d34d2 | 3132 | struct lttng_event *events = NULL; |
9f19cc17 | 3133 | |
b551a063 | 3134 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3135 | cmd_ctx->lsm->u.list.channel_name, &events); |
3136 | if (nb_event < 0) { | |
f73fabfd | 3137 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3138 | ret = -nb_event; |
3139 | goto error; | |
5461b305 | 3140 | } |
ca95a216 | 3141 | |
54d01ffb | 3142 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3143 | if (ret < 0) { |
ae9c20bc | 3144 | free(events); |
5461b305 DG |
3145 | goto setup_error; |
3146 | } | |
9f19cc17 | 3147 | |
54d01ffb DG |
3148 | /* Copy event list into message payload */ |
3149 | memcpy(cmd_ctx->llm->payload, events, | |
3150 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3151 | |
54d01ffb | 3152 | free(events); |
9f19cc17 | 3153 | |
f73fabfd | 3154 | ret = LTTNG_OK; |
5461b305 | 3155 | break; |
5e16da05 MD |
3156 | } |
3157 | case LTTNG_LIST_SESSIONS: | |
3158 | { | |
8e0af1b4 | 3159 | unsigned int nr_sessions; |
5461b305 | 3160 | |
8e0af1b4 | 3161 | session_lock_list(); |
730389d9 DG |
3162 | nr_sessions = lttng_sessions_count( |
3163 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3164 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3165 | |
8e0af1b4 | 3166 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3167 | if (ret < 0) { |
54d01ffb | 3168 | session_unlock_list(); |
5461b305 | 3169 | goto setup_error; |
e065084a | 3170 | } |
5e16da05 | 3171 | |
6c9cc2ab | 3172 | /* Filled the session array */ |
2f77fc4b | 3173 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3174 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3175 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3176 | |
54d01ffb | 3177 | session_unlock_list(); |
5e16da05 | 3178 | |
f73fabfd | 3179 | ret = LTTNG_OK; |
5e16da05 MD |
3180 | break; |
3181 | } | |
d0254c7c MD |
3182 | case LTTNG_CALIBRATE: |
3183 | { | |
54d01ffb DG |
3184 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3185 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3186 | break; |
3187 | } | |
d9800920 DG |
3188 | case LTTNG_REGISTER_CONSUMER: |
3189 | { | |
2f77fc4b DG |
3190 | struct consumer_data *cdata; |
3191 | ||
3192 | switch (cmd_ctx->lsm->domain.type) { | |
3193 | case LTTNG_DOMAIN_KERNEL: | |
3194 | cdata = &kconsumer_data; | |
3195 | break; | |
3196 | default: | |
f73fabfd | 3197 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3198 | goto error; |
3199 | } | |
3200 | ||
54d01ffb | 3201 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3202 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3203 | break; |
3204 | } | |
025faf73 | 3205 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
3206 | { |
3207 | struct lttng_filter_bytecode *bytecode; | |
3208 | ||
025faf73 | 3209 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 3210 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3211 | goto error; |
3212 | } | |
52df2401 MD |
3213 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
3214 | ret = LTTNG_ERR_FILTER_INVAL; | |
3215 | goto error; | |
3216 | } | |
025faf73 | 3217 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 3218 | if (!bytecode) { |
f73fabfd | 3219 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
3220 | goto error; |
3221 | } | |
3222 | /* Receive var. len. data */ | |
3223 | DBG("Receiving var len data from client ..."); | |
3224 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 3225 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
3226 | if (ret <= 0) { |
3227 | DBG("Nothing recv() from client var len data... continuing"); | |
3228 | *sock_error = 1; | |
f73fabfd | 3229 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3230 | goto error; |
3231 | } | |
3232 | ||
3233 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 3234 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 3235 | free(bytecode); |
f73fabfd | 3236 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
3237 | goto error; |
3238 | } | |
3239 | ||
7972aab2 | 3240 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
025faf73 DG |
3241 | cmd_ctx->lsm->u.enable.channel_name, |
3242 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
3243 | break; |
3244 | } | |
6d805429 | 3245 | case LTTNG_DATA_PENDING: |
806e2684 | 3246 | { |
6d805429 | 3247 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3248 | break; |
3249 | } | |
da3c9ec1 DG |
3250 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3251 | { | |
6dc3064a DG |
3252 | struct lttcomm_lttng_output_id reply; |
3253 | ||
3254 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3255 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3256 | if (ret != LTTNG_OK) { | |
3257 | goto error; | |
3258 | } | |
3259 | ||
3260 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3261 | if (ret < 0) { | |
3262 | goto setup_error; | |
3263 | } | |
3264 | ||
3265 | /* Copy output list into message payload */ | |
3266 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3267 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3268 | break; |
3269 | } | |
3270 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3271 | { | |
6dc3064a DG |
3272 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3273 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3274 | break; |
3275 | } | |
3276 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3277 | { | |
6dc3064a DG |
3278 | ssize_t nb_output; |
3279 | struct lttng_snapshot_output *outputs = NULL; | |
3280 | ||
3281 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3282 | if (nb_output < 0) { | |
3283 | ret = -nb_output; | |
3284 | goto error; | |
3285 | } | |
3286 | ||
3287 | ret = setup_lttng_msg(cmd_ctx, | |
3288 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3289 | if (ret < 0) { | |
3290 | free(outputs); | |
3291 | goto setup_error; | |
3292 | } | |
3293 | ||
3294 | if (outputs) { | |
3295 | /* Copy output list into message payload */ | |
3296 | memcpy(cmd_ctx->llm->payload, outputs, | |
3297 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3298 | free(outputs); | |
3299 | } | |
3300 | ||
3301 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3302 | break; |
3303 | } | |
3304 | case LTTNG_SNAPSHOT_RECORD: | |
3305 | { | |
6dc3064a DG |
3306 | ret = cmd_snapshot_record(cmd_ctx->session, |
3307 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3308 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3309 | break; |
3310 | } | |
27babd3a DG |
3311 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3312 | { | |
3313 | size_t nb_uri, len; | |
3314 | struct lttng_uri *uris = NULL; | |
3315 | ||
3316 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3317 | len = nb_uri * sizeof(struct lttng_uri); | |
3318 | ||
3319 | if (nb_uri > 0) { | |
3320 | uris = zmalloc(len); | |
3321 | if (uris == NULL) { | |
3322 | ret = LTTNG_ERR_FATAL; | |
3323 | goto error; | |
3324 | } | |
3325 | ||
3326 | /* Receive variable len data */ | |
3327 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3328 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3329 | if (ret <= 0) { | |
3330 | DBG("No URIs received from client... continuing"); | |
3331 | *sock_error = 1; | |
3332 | ret = LTTNG_ERR_SESSION_FAIL; | |
3333 | free(uris); | |
3334 | goto error; | |
3335 | } | |
3336 | ||
3337 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3338 | DBG("Creating session with ONE network URI is a bad call"); | |
3339 | ret = LTTNG_ERR_SESSION_FAIL; | |
3340 | free(uris); | |
3341 | goto error; | |
3342 | } | |
3343 | } | |
3344 | ||
3345 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3346 | nb_uri, &cmd_ctx->creds); | |
3347 | free(uris); | |
3348 | break; | |
3349 | } | |
5e16da05 | 3350 | default: |
f73fabfd | 3351 | ret = LTTNG_ERR_UND; |
5461b305 | 3352 | break; |
fac6795d DG |
3353 | } |
3354 | ||
5461b305 | 3355 | error: |
5461b305 DG |
3356 | if (cmd_ctx->llm == NULL) { |
3357 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3358 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3359 | goto setup_error; |
3360 | } | |
3361 | } | |
54d01ffb | 3362 | /* Set return code */ |
5461b305 | 3363 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3364 | setup_error: |
b5541356 | 3365 | if (cmd_ctx->session) { |
54d01ffb | 3366 | session_unlock(cmd_ctx->session); |
b5541356 | 3367 | } |
256a5576 MD |
3368 | if (need_tracing_session) { |
3369 | session_unlock_list(); | |
3370 | } | |
54d01ffb | 3371 | init_setup_error: |
8028d920 | 3372 | return ret; |
fac6795d DG |
3373 | } |
3374 | ||
44a5e5eb DG |
3375 | /* |
3376 | * Thread managing health check socket. | |
3377 | */ | |
3378 | static void *thread_manage_health(void *data) | |
3379 | { | |
eb4a2943 | 3380 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3381 | uint32_t revents, nb_fd; |
3382 | struct lttng_poll_event events; | |
3383 | struct lttcomm_health_msg msg; | |
3384 | struct lttcomm_health_data reply; | |
3385 | ||
3386 | DBG("[thread] Manage health check started"); | |
3387 | ||
3388 | rcu_register_thread(); | |
3389 | ||
6d737ce4 DG |
3390 | /* We might hit an error path before this is created. */ |
3391 | lttng_poll_init(&events); | |
3cc04881 | 3392 | |
44a5e5eb DG |
3393 | /* Create unix socket */ |
3394 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3395 | if (sock < 0) { | |
3396 | ERR("Unable to create health check Unix socket"); | |
3397 | ret = -1; | |
3398 | goto error; | |
3399 | } | |
3400 | ||
b662582b DG |
3401 | /* |
3402 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3403 | * show must go on. | |
3404 | */ | |
3405 | (void) utils_set_fd_cloexec(sock); | |
3406 | ||
44a5e5eb DG |
3407 | ret = lttcomm_listen_unix_sock(sock); |
3408 | if (ret < 0) { | |
3409 | goto error; | |
3410 | } | |
3411 | ||
3412 | /* | |
3413 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3414 | * more will be added to this poll set. | |
3415 | */ | |
d0b96690 | 3416 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3417 | if (ret < 0) { |
3418 | goto error; | |
3419 | } | |
3420 | ||
3421 | /* Add the application registration socket */ | |
3422 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3423 | if (ret < 0) { | |
3424 | goto error; | |
3425 | } | |
3426 | ||
3427 | while (1) { | |
3428 | DBG("Health check ready"); | |
3429 | ||
44a5e5eb DG |
3430 | /* Inifinite blocking call, waiting for transmission */ |
3431 | restart: | |
3432 | ret = lttng_poll_wait(&events, -1); | |
3433 | if (ret < 0) { | |
3434 | /* | |
3435 | * Restart interrupted system call. | |
3436 | */ | |
3437 | if (errno == EINTR) { | |
3438 | goto restart; | |
3439 | } | |
3440 | goto error; | |
3441 | } | |
3442 | ||
0d9c5d77 DG |
3443 | nb_fd = ret; |
3444 | ||
44a5e5eb DG |
3445 | for (i = 0; i < nb_fd; i++) { |
3446 | /* Fetch once the poll data */ | |
3447 | revents = LTTNG_POLL_GETEV(&events, i); | |
3448 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3449 | ||
3450 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3451 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3452 | if (ret) { |
139ac872 MD |
3453 | err = 0; |
3454 | goto exit; | |
44a5e5eb DG |
3455 | } |
3456 | ||
3457 | /* Event on the registration socket */ | |
3458 | if (pollfd == sock) { | |
3459 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3460 | ERR("Health socket poll error"); | |
3461 | goto error; | |
3462 | } | |
3463 | } | |
3464 | } | |
3465 | ||
3466 | new_sock = lttcomm_accept_unix_sock(sock); | |
3467 | if (new_sock < 0) { | |
3468 | goto error; | |
3469 | } | |
3470 | ||
b662582b DG |
3471 | /* |
3472 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3473 | * show must go on. | |
3474 | */ | |
3475 | (void) utils_set_fd_cloexec(new_sock); | |
3476 | ||
44a5e5eb DG |
3477 | DBG("Receiving data from client for health..."); |
3478 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3479 | if (ret <= 0) { | |
3480 | DBG("Nothing recv() from client... continuing"); | |
3481 | ret = close(new_sock); | |
3482 | if (ret) { | |
3483 | PERROR("close"); | |
3484 | } | |
3485 | new_sock = -1; | |
3486 | continue; | |
3487 | } | |
3488 | ||
3489 | rcu_thread_online(); | |
3490 | ||
3491 | switch (msg.component) { | |
3492 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3493 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3494 | break; |
139ac872 | 3495 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3496 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3497 | break; |
44a5e5eb | 3498 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3499 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3500 | break; |
3501 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3502 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3503 | break; |
3504 | case LTTNG_HEALTH_CONSUMER: | |
3505 | reply.ret_code = check_consumer_health(); | |
3506 | break; | |
0b2dc8df MD |
3507 | case LTTNG_HEALTH_HT_CLEANUP: |
3508 | reply.ret_code = health_check_state(HEALTH_TYPE_HT_CLEANUP); | |
3509 | break; | |
380e8d6f MD |
3510 | case LTTNG_HEALTH_APP_MANAGE_NOTIFY: |
3511 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY); | |
3512 | break; | |
12e2b881 MD |
3513 | case LTTNG_HEALTH_APP_REG_DISPATCH: |
3514 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
3515 | break; | |
44a5e5eb | 3516 | case LTTNG_HEALTH_ALL: |
44a5e5eb | 3517 | reply.ret_code = |
927ca06a DG |
3518 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3519 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3520 | health_check_state(HEALTH_TYPE_CMD) && | |
3521 | health_check_state(HEALTH_TYPE_KERNEL) && | |
0b2dc8df | 3522 | check_consumer_health() && |
380e8d6f | 3523 | health_check_state(HEALTH_TYPE_HT_CLEANUP) && |
12e2b881 MD |
3524 | health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY) && |
3525 | health_check_state(HEALTH_TYPE_APP_REG_DISPATCH); | |
44a5e5eb DG |
3526 | break; |
3527 | default: | |
f73fabfd | 3528 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3529 | break; |
3530 | } | |
3531 | ||
3532 | /* | |
3533 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3534 | * the client where in the sessiond it is the opposite. Again, this is | |
3535 | * just to make things easier for us poor developer which enjoy a lot | |
3536 | * lazyness. | |
3537 | */ | |
3538 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3539 | reply.ret_code = !reply.ret_code; | |
3540 | } | |
3541 | ||
3542 | DBG2("Health check return value %d", reply.ret_code); | |
3543 | ||
3544 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3545 | if (ret < 0) { | |
3546 | ERR("Failed to send health data back to client"); | |
3547 | } | |
3548 | ||
3549 | /* End of transmission */ | |
3550 | ret = close(new_sock); | |
3551 | if (ret) { | |
3552 | PERROR("close"); | |
3553 | } | |
3554 | new_sock = -1; | |
3555 | } | |
3556 | ||
139ac872 | 3557 | exit: |
44a5e5eb | 3558 | error: |
139ac872 MD |
3559 | if (err) { |
3560 | ERR("Health error occurred in %s", __func__); | |
3561 | } | |
44a5e5eb DG |
3562 | DBG("Health check thread dying"); |
3563 | unlink(health_unix_sock_path); | |
3564 | if (sock >= 0) { | |
3565 | ret = close(sock); | |
3566 | if (ret) { | |
3567 | PERROR("close"); | |
3568 | } | |
3569 | } | |
44a5e5eb DG |
3570 | |
3571 | lttng_poll_clean(&events); | |
3572 | ||
3573 | rcu_unregister_thread(); | |
3574 | return NULL; | |
3575 | } | |
3576 | ||
1d4b027a | 3577 | /* |
d063d709 DG |
3578 | * This thread manage all clients request using the unix client socket for |
3579 | * communication. | |
1d4b027a DG |
3580 | */ |
3581 | static void *thread_manage_clients(void *data) | |
3582 | { | |
139ac872 | 3583 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3584 | int sock_error; |
5eb91c98 | 3585 | uint32_t revents, nb_fd; |
273ea72c | 3586 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3587 | struct lttng_poll_event events; |
1d4b027a DG |
3588 | |
3589 | DBG("[thread] Manage client started"); | |
3590 | ||
f6a9efaa DG |
3591 | rcu_register_thread(); |
3592 | ||
927ca06a DG |
3593 | health_register(HEALTH_TYPE_CMD); |
3594 | ||
6993eeb3 CB |
3595 | if (testpoint(thread_manage_clients)) { |
3596 | goto error_testpoint; | |
3597 | } | |
3598 | ||
840cb59c | 3599 | health_code_update(); |
44a5e5eb | 3600 | |
1d4b027a DG |
3601 | ret = lttcomm_listen_unix_sock(client_sock); |
3602 | if (ret < 0) { | |
35df2755 | 3603 | goto error_listen; |
1d4b027a DG |
3604 | } |
3605 | ||
5eb91c98 DG |
3606 | /* |
3607 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3608 | * more will be added to this poll set. | |
3609 | */ | |
d0b96690 | 3610 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3611 | if (ret < 0) { |
35df2755 | 3612 | goto error_create_poll; |
5eb91c98 | 3613 | } |
273ea72c | 3614 | |
5eb91c98 DG |
3615 | /* Add the application registration socket */ |
3616 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3617 | if (ret < 0) { | |
3618 | goto error; | |
3619 | } | |
273ea72c | 3620 | |
bbd973c2 DG |
3621 | /* |
3622 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3623 | */ |
3624 | if (opt_sig_parent) { | |
8db8d1dc | 3625 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3626 | } |
3627 | ||
6993eeb3 CB |
3628 | if (testpoint(thread_manage_clients_before_loop)) { |
3629 | goto error; | |
3630 | } | |
8ac94142 | 3631 | |
840cb59c | 3632 | health_code_update(); |
44a5e5eb | 3633 | |
1d4b027a | 3634 | while (1) { |
1d4b027a | 3635 | DBG("Accepting client command ..."); |
273ea72c DG |
3636 | |
3637 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3638 | restart: |
a78af745 | 3639 | health_poll_entry(); |
5eb91c98 | 3640 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3641 | health_poll_exit(); |
273ea72c | 3642 | if (ret < 0) { |
88f2b785 MD |
3643 | /* |
3644 | * Restart interrupted system call. | |
3645 | */ | |
3646 | if (errno == EINTR) { | |
3647 | goto restart; | |
3648 | } | |
273ea72c DG |
3649 | goto error; |
3650 | } | |
3651 | ||
0d9c5d77 DG |
3652 | nb_fd = ret; |
3653 | ||
5eb91c98 DG |
3654 | for (i = 0; i < nb_fd; i++) { |
3655 | /* Fetch once the poll data */ | |
3656 | revents = LTTNG_POLL_GETEV(&events, i); | |
3657 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3658 | ||
840cb59c | 3659 | health_code_update(); |
44a5e5eb | 3660 | |
5eb91c98 | 3661 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3662 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3663 | if (ret) { |
139ac872 MD |
3664 | err = 0; |
3665 | goto exit; | |
5eb91c98 DG |
3666 | } |
3667 | ||
3668 | /* Event on the registration socket */ | |
3669 | if (pollfd == client_sock) { | |
3670 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3671 | ERR("Client socket poll error"); | |
3672 | goto error; | |
3673 | } | |
3674 | } | |
3675 | } | |
3676 | ||
3677 | DBG("Wait for client response"); | |
3678 | ||
840cb59c | 3679 | health_code_update(); |
44a5e5eb | 3680 | |
5eb91c98 DG |
3681 | sock = lttcomm_accept_unix_sock(client_sock); |
3682 | if (sock < 0) { | |
273ea72c | 3683 | goto error; |
273ea72c DG |
3684 | } |
3685 | ||
b662582b DG |
3686 | /* |
3687 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3688 | * show must go on. | |
3689 | */ | |
3690 | (void) utils_set_fd_cloexec(sock); | |
3691 | ||
be040666 DG |
3692 | /* Set socket option for credentials retrieval */ |
3693 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3694 | if (ret < 0) { | |
3695 | goto error; | |
3696 | } | |
3697 | ||
5eb91c98 | 3698 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3699 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3700 | if (cmd_ctx == NULL) { |
76d7553f | 3701 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3702 | goto error; |
5eb91c98 | 3703 | } |
1d4b027a | 3704 | |
5eb91c98 | 3705 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3706 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3707 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3708 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3709 | goto error; |
3710 | } | |
1d4b027a | 3711 | |
5eb91c98 DG |
3712 | cmd_ctx->llm = NULL; |
3713 | cmd_ctx->session = NULL; | |
1d4b027a | 3714 | |
840cb59c | 3715 | health_code_update(); |
44a5e5eb | 3716 | |
5eb91c98 DG |
3717 | /* |
3718 | * Data is received from the lttng client. The struct | |
3719 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3720 | * the client. | |
3721 | */ | |
3722 | DBG("Receiving data from client ..."); | |
be040666 DG |
3723 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3724 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3725 | if (ret <= 0) { |
3726 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3727 | ret = close(sock); |
3728 | if (ret) { | |
3729 | PERROR("close"); | |
3730 | } | |
3731 | sock = -1; | |
a2c0da86 | 3732 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3733 | continue; |
3734 | } | |
1d4b027a | 3735 | |
840cb59c | 3736 | health_code_update(); |
44a5e5eb | 3737 | |
5eb91c98 DG |
3738 | // TODO: Validate cmd_ctx including sanity check for |
3739 | // security purpose. | |
f7776ea7 | 3740 | |
f6a9efaa | 3741 | rcu_thread_online(); |
5eb91c98 DG |
3742 | /* |
3743 | * This function dispatch the work to the kernel or userspace tracer | |
3744 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3745 | * informations for the client. The command context struct contains | |
3746 | * everything this function may needs. | |
3747 | */ | |
53a80697 | 3748 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3749 | rcu_thread_offline(); |
5eb91c98 | 3750 | if (ret < 0) { |
36134aa1 DG |
3751 | ret = close(sock); |
3752 | if (ret) { | |
3753 | PERROR("close"); | |
53a80697 | 3754 | } |
36134aa1 | 3755 | sock = -1; |
bbd973c2 | 3756 | /* |
5eb91c98 | 3757 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3758 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3759 | * (ENOMEM). Error detected but still accept |
3760 | * command, unless a socket error has been | |
3761 | * detected. | |
bbd973c2 | 3762 | */ |
bbd973c2 | 3763 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3764 | continue; |
3765 | } | |
d6e4fca4 | 3766 | |
840cb59c | 3767 | health_code_update(); |
44a5e5eb | 3768 | |
54d01ffb DG |
3769 | DBG("Sending response (size: %d, retcode: %s)", |
3770 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3771 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3772 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3773 | if (ret < 0) { |
3774 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3775 | } |
1d4b027a | 3776 | |
5eb91c98 | 3777 | /* End of transmission */ |
76d7553f MD |
3778 | ret = close(sock); |
3779 | if (ret) { | |
3780 | PERROR("close"); | |
3781 | } | |
3782 | sock = -1; | |
be040666 DG |
3783 | |
3784 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3785 | |
840cb59c | 3786 | health_code_update(); |
273ea72c DG |
3787 | } |
3788 | ||
139ac872 | 3789 | exit: |
5eb91c98 | 3790 | error: |
35df2755 CB |
3791 | if (sock >= 0) { |
3792 | ret = close(sock); | |
3793 | if (ret) { | |
3794 | PERROR("close"); | |
3795 | } | |
139ac872 | 3796 | } |
44a5e5eb | 3797 | |
35df2755 CB |
3798 | lttng_poll_clean(&events); |
3799 | clean_command_ctx(&cmd_ctx); | |
3800 | ||
3801 | error_listen: | |
3802 | error_create_poll: | |
6993eeb3 | 3803 | error_testpoint: |
273ea72c | 3804 | unlink(client_unix_sock_path); |
76d7553f MD |
3805 | if (client_sock >= 0) { |
3806 | ret = close(client_sock); | |
3807 | if (ret) { | |
3808 | PERROR("close"); | |
3809 | } | |
a4b35e07 | 3810 | } |
35df2755 CB |
3811 | |
3812 | if (err) { | |
840cb59c | 3813 | health_error(); |
35df2755 | 3814 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3815 | } |
273ea72c | 3816 | |
927ca06a | 3817 | health_unregister(); |
35df2755 CB |
3818 | |
3819 | DBG("Client thread dying"); | |
f6a9efaa DG |
3820 | |
3821 | rcu_unregister_thread(); | |
1d4b027a DG |
3822 | return NULL; |
3823 | } | |
3824 | ||
3825 | ||
fac6795d DG |
3826 | /* |
3827 | * usage function on stderr | |
3828 | */ | |
3829 | static void usage(void) | |
3830 | { | |
b716ce68 | 3831 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3832 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3833 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3834 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3835 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3836 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3837 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3838 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3839 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3840 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3841 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3842 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3843 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3844 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3845 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3846 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3847 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3848 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3849 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3850 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3851 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3852 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3853 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3854 | } |
3855 | ||
3856 | /* | |
3857 | * daemon argument parsing | |
3858 | */ | |
3859 | static int parse_args(int argc, char **argv) | |
3860 | { | |
3861 | int c; | |
3862 | ||
3863 | static struct option long_options[] = { | |
3864 | { "client-sock", 1, 0, 'c' }, | |
3865 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3866 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3867 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3868 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3869 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3870 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3871 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3872 | { "consumerd32-path", 1, 0, 'u' }, | |
3873 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3874 | { "consumerd64-path", 1, 0, 't' }, | |
3875 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3876 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3877 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3878 | { "help", 0, 0, 'h' }, |
3879 | { "group", 1, 0, 'g' }, | |
3880 | { "version", 0, 0, 'V' }, | |
75462a81 | 3881 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3882 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3883 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3884 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3885 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3886 | { NULL, 0, 0, 0 } |
3887 | }; | |
3888 | ||
3889 | while (1) { | |
3890 | int option_index = 0; | |
35f90c40 | 3891 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3892 | long_options, &option_index); |
fac6795d DG |
3893 | if (c == -1) { |
3894 | break; | |
3895 | } | |
3896 | ||
3897 | switch (c) { | |
3898 | case 0: | |
3899 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3900 | if (optarg) { | |
3901 | fprintf(stderr, " with arg %s\n", optarg); | |
3902 | } | |
3903 | break; | |
b716ce68 | 3904 | case 'c': |
fac6795d DG |
3905 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3906 | break; | |
3907 | case 'a': | |
3908 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3909 | break; | |
3910 | case 'd': | |
3911 | opt_daemon = 1; | |
3912 | break; | |
3913 | case 'g': | |
fb09408a | 3914 | opt_tracing_group = optarg; |
fac6795d DG |
3915 | break; |
3916 | case 'h': | |
3917 | usage(); | |
3918 | exit(EXIT_FAILURE); | |
3919 | case 'V': | |
3920 | fprintf(stdout, "%s\n", VERSION); | |
3921 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3922 | case 'S': |
3923 | opt_sig_parent = 1; | |
3924 | break; | |
d6f42150 | 3925 | case 'E': |
3bd1e081 | 3926 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3927 | break; |
3928 | case 'C': | |
3bd1e081 MD |
3929 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3930 | break; | |
3931 | case 'F': | |
7753dea8 | 3932 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3933 | break; |
3934 | case 'D': | |
7753dea8 MD |
3935 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3936 | break; | |
3937 | case 'H': | |
3938 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3939 | break; | |
3940 | case 'G': | |
3941 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3942 | break; |
4fba7219 DG |
3943 | case 'N': |
3944 | opt_no_kernel = 1; | |
3945 | break; | |
75462a81 | 3946 | case 'q': |
97e19046 | 3947 | lttng_opt_quiet = 1; |
75462a81 | 3948 | break; |
3f9947db | 3949 | case 'v': |
53086306 | 3950 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3951 | lttng_opt_verbose += 1; |
3f9947db | 3952 | break; |
31f73cc9 | 3953 | case 'Z': |
3bd1e081 | 3954 | opt_verbose_consumer += 1; |
31f73cc9 | 3955 | break; |
fb09408a | 3956 | case 'u': |
fc7a59ce | 3957 | consumerd32_bin= optarg; |
ebaeda94 MD |
3958 | break; |
3959 | case 'U': | |
3960 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3961 | break; |
3962 | case 't': | |
fc7a59ce | 3963 | consumerd64_bin = optarg; |
ebaeda94 MD |
3964 | break; |
3965 | case 'T': | |
3966 | consumerd64_libdir = optarg; | |
fb09408a | 3967 | break; |
35f90c40 DG |
3968 | case 'p': |
3969 | opt_pidfile = optarg; | |
3970 | break; | |
fac6795d DG |
3971 | default: |
3972 | /* Unknown option or other error. | |
3973 | * Error is printed by getopt, just return */ | |
3974 | return -1; | |
3975 | } | |
3976 | } | |
3977 | ||
3978 | return 0; | |
3979 | } | |
3980 | ||
3981 | /* | |
d063d709 | 3982 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3983 | * apps_sock - The communication socket for all UST apps. |
3984 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3985 | */ |
cf3af59e | 3986 | static int init_daemon_socket(void) |
fac6795d DG |
3987 | { |
3988 | int ret = 0; | |
3989 | mode_t old_umask; | |
3990 | ||
3991 | old_umask = umask(0); | |
3992 | ||
3993 | /* Create client tool unix socket */ | |
d6f42150 DG |
3994 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3995 | if (client_sock < 0) { | |
3996 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3997 | ret = -1; |
3998 | goto end; | |
3999 | } | |
4000 | ||
b662582b DG |
4001 | /* Set the cloexec flag */ |
4002 | ret = utils_set_fd_cloexec(client_sock); | |
4003 | if (ret < 0) { | |
4004 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
4005 | "Continuing but note that the consumer daemon will have a " | |
4006 | "reference to this socket on exec()", client_sock); | |
4007 | } | |
4008 | ||
fac6795d DG |
4009 | /* File permission MUST be 660 */ |
4010 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4011 | if (ret < 0) { | |
d6f42150 | 4012 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4013 | PERROR("chmod"); |
fac6795d DG |
4014 | goto end; |
4015 | } | |
4016 | ||
4017 | /* Create the application unix socket */ | |
d6f42150 DG |
4018 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4019 | if (apps_sock < 0) { | |
4020 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4021 | ret = -1; |
4022 | goto end; | |
4023 | } | |
4024 | ||
b662582b DG |
4025 | /* Set the cloexec flag */ |
4026 | ret = utils_set_fd_cloexec(apps_sock); | |
4027 | if (ret < 0) { | |
4028 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
4029 | "Continuing but note that the consumer daemon will have a " | |
4030 | "reference to this socket on exec()", apps_sock); | |
4031 | } | |
4032 | ||
d6f42150 | 4033 | /* File permission MUST be 666 */ |
54d01ffb DG |
4034 | ret = chmod(apps_unix_sock_path, |
4035 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4036 | if (ret < 0) { |
d6f42150 | 4037 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4038 | PERROR("chmod"); |
fac6795d DG |
4039 | goto end; |
4040 | } | |
4041 | ||
b662582b DG |
4042 | DBG3("Session daemon client socket %d and application socket %d created", |
4043 | client_sock, apps_sock); | |
4044 | ||
fac6795d DG |
4045 | end: |
4046 | umask(old_umask); | |
4047 | return ret; | |
4048 | } | |
4049 | ||
4050 | /* | |
54d01ffb DG |
4051 | * Check if the global socket is available, and if a daemon is answering at the |
4052 | * other side. If yes, error is returned. | |
fac6795d | 4053 | */ |
cf3af59e | 4054 | static int check_existing_daemon(void) |
fac6795d | 4055 | { |
7d8234d9 | 4056 | /* Is there anybody out there ? */ |
099e26bd | 4057 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4058 | return -EEXIST; |
099e26bd | 4059 | } |
b09c7c76 DG |
4060 | |
4061 | return 0; | |
fac6795d DG |
4062 | } |
4063 | ||
fac6795d | 4064 | /* |
d063d709 | 4065 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4066 | * |
d063d709 | 4067 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4068 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4069 | */ |
be040666 | 4070 | static int set_permissions(char *rundir) |
fac6795d DG |
4071 | { |
4072 | int ret; | |
996b65c8 | 4073 | gid_t gid; |
fac6795d | 4074 | |
6775595e DG |
4075 | ret = allowed_group(); |
4076 | if (ret < 0) { | |
be040666 | 4077 | WARN("No tracing group detected"); |
360e82e5 MD |
4078 | /* Setting gid to 0 if no tracing group is found */ |
4079 | gid = 0; | |
4080 | } else { | |
4081 | gid = ret; | |
fac6795d DG |
4082 | } |
4083 | ||
d6f42150 | 4084 | /* Set lttng run dir */ |
be040666 | 4085 | ret = chown(rundir, 0, gid); |
d6f42150 | 4086 | if (ret < 0) { |
be040666 | 4087 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4088 | PERROR("chown"); |
d6f42150 DG |
4089 | } |
4090 | ||
360e82e5 | 4091 | /* Ensure all applications and tracing group can search the run dir */ |
61076f74 | 4092 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
4093 | if (ret < 0) { |
4094 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 4095 | PERROR("chmod"); |
d1613cf5 JN |
4096 | } |
4097 | ||
d6f42150 | 4098 | /* lttng client socket path */ |
996b65c8 | 4099 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 4100 | if (ret < 0) { |
d6f42150 | 4101 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 4102 | PERROR("chown"); |
d6f42150 DG |
4103 | } |
4104 | ||
3bd1e081 MD |
4105 | /* kconsumer error socket path */ |
4106 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 4107 | if (ret < 0) { |
3bd1e081 | 4108 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 4109 | PERROR("chown"); |
3bd1e081 MD |
4110 | } |
4111 | ||
7753dea8 MD |
4112 | /* 64-bit ustconsumer error socket path */ |
4113 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
4114 | if (ret < 0) { | |
4115 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 4116 | PERROR("chown"); |
7753dea8 MD |
4117 | } |
4118 | ||
4119 | /* 32-bit ustconsumer compat32 error socket path */ | |
4120 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4121 | if (ret < 0) { |
7753dea8 | 4122 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 4123 | PERROR("chown"); |
fac6795d DG |
4124 | } |
4125 | ||
d6f42150 | 4126 | DBG("All permissions are set"); |
e07ae692 | 4127 | |
fac6795d DG |
4128 | return ret; |
4129 | } | |
4130 | ||
d6f42150 | 4131 | /* |
d063d709 | 4132 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4133 | */ |
67e40797 | 4134 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4135 | { |
4136 | int ret; | |
4137 | ||
67e40797 DG |
4138 | DBG3("Creating LTTng run directory: %s", rundir); |
4139 | ||
d1613cf5 | 4140 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 4141 | if (ret < 0) { |
b1f11e69 | 4142 | if (errno != EEXIST) { |
67e40797 | 4143 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4144 | goto error; |
4145 | } else { | |
4146 | ret = 0; | |
4147 | } | |
d6f42150 DG |
4148 | } |
4149 | ||
4150 | error: | |
4151 | return ret; | |
4152 | } | |
4153 | ||
4154 | /* | |
d063d709 DG |
4155 | * Setup sockets and directory needed by the kconsumerd communication with the |
4156 | * session daemon. | |
d6f42150 | 4157 | */ |
67e40797 DG |
4158 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4159 | const char *rundir) | |
d6f42150 DG |
4160 | { |
4161 | int ret; | |
67e40797 | 4162 | char path[PATH_MAX]; |
d6f42150 | 4163 | |
67e40797 | 4164 | switch (consumer_data->type) { |
7753dea8 | 4165 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 4166 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4167 | break; |
4168 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 4169 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4170 | break; |
4171 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 4172 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4173 | break; |
4174 | default: | |
4175 | ERR("Consumer type unknown"); | |
4176 | ret = -EINVAL; | |
4177 | goto error; | |
d6f42150 DG |
4178 | } |
4179 | ||
67e40797 DG |
4180 | DBG2("Creating consumer directory: %s", path); |
4181 | ||
d1613cf5 | 4182 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 4183 | if (ret < 0) { |
6beb2242 | 4184 | if (errno != EEXIST) { |
f11e84c2 | 4185 | PERROR("mkdir"); |
3bd1e081 | 4186 | ERR("Failed to create %s", path); |
6beb2242 DG |
4187 | goto error; |
4188 | } | |
f11e84c2 | 4189 | ret = -1; |
d6f42150 DG |
4190 | } |
4191 | ||
4192 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4193 | consumer_data->err_sock = |
4194 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4195 | if (consumer_data->err_sock < 0) { | |
4196 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4197 | ret = -1; |
4198 | goto error; | |
4199 | } | |
4200 | ||
a24f05ab MD |
4201 | /* |
4202 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4203 | * show must go on. | |
4204 | */ | |
4205 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
4206 | if (ret < 0) { | |
4207 | PERROR("utils_set_fd_cloexec"); | |
4208 | /* continue anyway */ | |
4209 | } | |
4210 | ||
d6f42150 | 4211 | /* File permission MUST be 660 */ |
3bd1e081 | 4212 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4213 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4214 | if (ret < 0) { |
3bd1e081 | 4215 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4216 | PERROR("chmod"); |
d6f42150 DG |
4217 | goto error; |
4218 | } | |
4219 | ||
4220 | error: | |
4221 | return ret; | |
4222 | } | |
4223 | ||
fac6795d | 4224 | /* |
d063d709 | 4225 | * Signal handler for the daemon |
cf3af59e | 4226 | * |
54d01ffb DG |
4227 | * Simply stop all worker threads, leaving main() return gracefully after |
4228 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4229 | */ |
4230 | static void sighandler(int sig) | |
4231 | { | |
4232 | switch (sig) { | |
cf3af59e | 4233 | case SIGPIPE: |
af87c45a | 4234 | DBG("SIGPIPE caught"); |
cf3af59e MD |
4235 | return; |
4236 | case SIGINT: | |
af87c45a | 4237 | DBG("SIGINT caught"); |
cf3af59e MD |
4238 | stop_threads(); |
4239 | break; | |
4240 | case SIGTERM: | |
af87c45a | 4241 | DBG("SIGTERM caught"); |
cf3af59e MD |
4242 | stop_threads(); |
4243 | break; | |
4244 | default: | |
4245 | break; | |
fac6795d | 4246 | } |
fac6795d DG |
4247 | } |
4248 | ||
4249 | /* | |
d063d709 | 4250 | * Setup signal handler for : |
1d4b027a | 4251 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4252 | */ |
1d4b027a | 4253 | static int set_signal_handler(void) |
fac6795d | 4254 | { |
1d4b027a DG |
4255 | int ret = 0; |
4256 | struct sigaction sa; | |
4257 | sigset_t sigset; | |
fac6795d | 4258 | |
1d4b027a | 4259 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 4260 | PERROR("sigemptyset"); |
1d4b027a DG |
4261 | return ret; |
4262 | } | |
d6f42150 | 4263 | |
1d4b027a DG |
4264 | sa.sa_handler = sighandler; |
4265 | sa.sa_mask = sigset; | |
4266 | sa.sa_flags = 0; | |
4267 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 4268 | PERROR("sigaction"); |
1d4b027a | 4269 | return ret; |
d6f42150 DG |
4270 | } |
4271 | ||
1d4b027a | 4272 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 4273 | PERROR("sigaction"); |
1d4b027a | 4274 | return ret; |
d6f42150 | 4275 | } |
aaf26714 | 4276 | |
1d4b027a | 4277 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 4278 | PERROR("sigaction"); |
1d4b027a | 4279 | return ret; |
8c0faa1d DG |
4280 | } |
4281 | ||
1d4b027a DG |
4282 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4283 | ||
4284 | return ret; | |
fac6795d DG |
4285 | } |
4286 | ||
f3ed775e | 4287 | /* |
d063d709 DG |
4288 | * Set open files limit to unlimited. This daemon can open a large number of |
4289 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4290 | */ |
4291 | static void set_ulimit(void) | |
4292 | { | |
4293 | int ret; | |
4294 | struct rlimit lim; | |
4295 | ||
a88df331 | 4296 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4297 | lim.rlim_cur = 65535; |
4298 | lim.rlim_max = 65535; | |
4299 | ||
4300 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4301 | if (ret < 0) { | |
76d7553f | 4302 | PERROR("failed to set open files limit"); |
f3ed775e DG |
4303 | } |
4304 | } | |
4305 | ||
35f90c40 DG |
4306 | /* |
4307 | * Write pidfile using the rundir and opt_pidfile. | |
4308 | */ | |
4309 | static void write_pidfile(void) | |
4310 | { | |
4311 | int ret; | |
4312 | char pidfile_path[PATH_MAX]; | |
4313 | ||
4314 | assert(rundir); | |
4315 | ||
4316 | if (opt_pidfile) { | |
4317 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
4318 | } else { | |
4319 | /* Build pidfile path from rundir and opt_pidfile. */ | |
4320 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
4321 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
4322 | if (ret < 0) { | |
4323 | PERROR("snprintf pidfile path"); | |
4324 | goto error; | |
4325 | } | |
4326 | } | |
4327 | ||
4328 | /* | |
4329 | * Create pid file in rundir. Return value is of no importance. The | |
4330 | * execution will continue even though we are not able to write the file. | |
4331 | */ | |
4332 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
4333 | ||
4334 | error: | |
4335 | return; | |
4336 | } | |
4337 | ||
fac6795d DG |
4338 | /* |
4339 | * main | |
4340 | */ | |
4341 | int main(int argc, char **argv) | |
4342 | { | |
fac6795d DG |
4343 | int ret = 0; |
4344 | void *status; | |
ae9e45b3 | 4345 | const char *home_path, *env_app_timeout; |
fac6795d | 4346 | |
335a95b7 MD |
4347 | init_kernel_workarounds(); |
4348 | ||
f6a9efaa DG |
4349 | rcu_register_thread(); |
4350 | ||
7753dea8 | 4351 | setup_consumerd_path(); |
fb09408a | 4352 | |
12744796 DG |
4353 | page_size = sysconf(_SC_PAGESIZE); |
4354 | if (page_size < 0) { | |
4355 | PERROR("sysconf _SC_PAGESIZE"); | |
4356 | page_size = LONG_MAX; | |
4357 | WARN("Fallback page size to %ld", page_size); | |
4358 | } | |
4359 | ||
fac6795d DG |
4360 | /* Parse arguments */ |
4361 | progname = argv[0]; | |
c617c0c6 | 4362 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 4363 | goto error; |
fac6795d DG |
4364 | } |
4365 | ||
4366 | /* Daemonize */ | |
4367 | if (opt_daemon) { | |
ceed52b5 MD |
4368 | int i; |
4369 | ||
4370 | /* | |
4371 | * fork | |
4372 | * child: setsid, close FD 0, 1, 2, chdir / | |
4373 | * parent: exit (if fork is successful) | |
4374 | */ | |
53094c05 DG |
4375 | ret = daemon(0, 0); |
4376 | if (ret < 0) { | |
76d7553f | 4377 | PERROR("daemon"); |
cf3af59e | 4378 | goto error; |
53094c05 | 4379 | } |
ceed52b5 MD |
4380 | /* |
4381 | * We are in the child. Make sure all other file | |
4382 | * descriptors are closed, in case we are called with | |
4383 | * more opened file descriptors than the standard ones. | |
4384 | */ | |
4385 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4386 | (void) close(i); | |
4387 | } | |
4388 | } | |
4389 | ||
4390 | /* Create thread quit pipe */ | |
4391 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4392 | goto error; | |
fac6795d DG |
4393 | } |
4394 | ||
4395 | /* Check if daemon is UID = 0 */ | |
4396 | is_root = !getuid(); | |
4397 | ||
fac6795d | 4398 | if (is_root) { |
990570ed | 4399 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4400 | |
4401 | /* Create global run dir with root access */ | |
4402 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4403 | if (ret < 0) { |
cf3af59e | 4404 | goto error; |
d6f42150 DG |
4405 | } |
4406 | ||
fac6795d | 4407 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4408 | snprintf(apps_unix_sock_path, PATH_MAX, |
4409 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4410 | } |
4411 | ||
4412 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4413 | snprintf(client_unix_sock_path, PATH_MAX, |
4414 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4415 | } | |
0fdd1e2c DG |
4416 | |
4417 | /* Set global SHM for ust */ | |
4418 | if (strlen(wait_shm_path) == 0) { | |
4419 | snprintf(wait_shm_path, PATH_MAX, | |
4420 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4421 | } | |
67e40797 | 4422 | |
44a5e5eb DG |
4423 | if (strlen(health_unix_sock_path) == 0) { |
4424 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4425 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4426 | } | |
4427 | ||
67e40797 DG |
4428 | /* Setup kernel consumerd path */ |
4429 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4430 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4431 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4432 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4433 | |
4434 | DBG2("Kernel consumer err path: %s", | |
4435 | kconsumer_data.err_unix_sock_path); | |
4436 | DBG2("Kernel consumer cmd path: %s", | |
4437 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4438 | } else { |
feb0f3e5 | 4439 | home_path = utils_get_home_dir(); |
b082db07 | 4440 | if (home_path == NULL) { |
273ea72c DG |
4441 | /* TODO: Add --socket PATH option */ |
4442 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4443 | ret = -EPERM; |
4444 | goto error; | |
b082db07 DG |
4445 | } |
4446 | ||
67e40797 DG |
4447 | /* |
4448 | * Create rundir from home path. This will create something like | |
4449 | * $HOME/.lttng | |
4450 | */ | |
990570ed | 4451 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4452 | if (ret < 0) { |
4453 | ret = -ENOMEM; | |
4454 | goto error; | |
4455 | } | |
4456 | ||
4457 | ret = create_lttng_rundir(rundir); | |
4458 | if (ret < 0) { | |
4459 | goto error; | |
4460 | } | |
4461 | ||
fac6795d | 4462 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4463 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4464 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4465 | } |
4466 | ||
4467 | /* Set the cli tool unix socket path */ | |
4468 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4469 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4470 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4471 | } |
0fdd1e2c DG |
4472 | |
4473 | /* Set global SHM for ust */ | |
4474 | if (strlen(wait_shm_path) == 0) { | |
4475 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4476 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4477 | } |
44a5e5eb DG |
4478 | |
4479 | /* Set health check Unix path */ | |
4480 | if (strlen(health_unix_sock_path) == 0) { | |
4481 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4482 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4483 | } | |
fac6795d DG |
4484 | } |
4485 | ||
5c827ce0 DG |
4486 | /* Set consumer initial state */ |
4487 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4488 | ust_consumerd_state = CONSUMER_STOPPED; | |
4489 | ||
847177cd DG |
4490 | DBG("Client socket path %s", client_unix_sock_path); |
4491 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4492 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4493 | DBG("LTTng run directory path: %s", rundir); |
4494 | ||
4495 | /* 32 bits consumerd path setup */ | |
4496 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4497 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4498 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4499 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4500 | |
4501 | DBG2("UST consumer 32 bits err path: %s", | |
4502 | ustconsumer32_data.err_unix_sock_path); | |
4503 | DBG2("UST consumer 32 bits cmd path: %s", | |
4504 | ustconsumer32_data.cmd_unix_sock_path); | |
4505 | ||
4506 | /* 64 bits consumerd path setup */ | |
4507 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4508 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4509 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4510 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4511 | |
4512 | DBG2("UST consumer 64 bits err path: %s", | |
4513 | ustconsumer64_data.err_unix_sock_path); | |
4514 | DBG2("UST consumer 64 bits cmd path: %s", | |
4515 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4516 | |
273ea72c | 4517 | /* |
7d8234d9 | 4518 | * See if daemon already exist. |
fac6795d | 4519 | */ |
7d8234d9 | 4520 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4521 | ERR("Already running daemon.\n"); |
273ea72c | 4522 | /* |
cf3af59e MD |
4523 | * We do not goto exit because we must not cleanup() |
4524 | * because a daemon is already running. | |
ab118b20 | 4525 | */ |
cf3af59e | 4526 | goto error; |
a88df331 DG |
4527 | } |
4528 | ||
1427f9b2 DG |
4529 | /* |
4530 | * Init UST app hash table. Alloc hash table before this point since | |
4531 | * cleanup() can get called after that point. | |
4532 | */ | |
4533 | ust_app_ht_alloc(); | |
4534 | ||
54d01ffb | 4535 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4536 | |
4537 | /* | |
4538 | * These actions must be executed as root. We do that *after* setting up | |
4539 | * the sockets path because we MUST make the check for another daemon using | |
4540 | * those paths *before* trying to set the kernel consumer sockets and init | |
4541 | * kernel tracer. | |
4542 | */ | |
4543 | if (is_root) { | |
67e40797 | 4544 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4545 | if (ret < 0) { |
4546 | goto exit; | |
4547 | } | |
4548 | ||
a88df331 | 4549 | /* Setup kernel tracer */ |
4fba7219 DG |
4550 | if (!opt_no_kernel) { |
4551 | init_kernel_tracer(); | |
4552 | } | |
a88df331 DG |
4553 | |
4554 | /* Set ulimit for open files */ | |
4555 | set_ulimit(); | |
fac6795d | 4556 | } |
4063050c MD |
4557 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4558 | lttng_fd_init(); | |
fac6795d | 4559 | |
67e40797 DG |
4560 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4561 | if (ret < 0) { | |
4562 | goto exit; | |
4563 | } | |
4564 | ||
4565 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4566 | if (ret < 0) { | |
4567 | goto exit; | |
4568 | } | |
4569 | ||
cf3af59e MD |
4570 | if ((ret = set_signal_handler()) < 0) { |
4571 | goto exit; | |
fac6795d DG |
4572 | } |
4573 | ||
d6f42150 | 4574 | /* Setup the needed unix socket */ |
cf3af59e MD |
4575 | if ((ret = init_daemon_socket()) < 0) { |
4576 | goto exit; | |
fac6795d DG |
4577 | } |
4578 | ||
4579 | /* Set credentials to socket */ | |
be040666 | 4580 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4581 | goto exit; |
fac6795d DG |
4582 | } |
4583 | ||
5b8719f5 DG |
4584 | /* Get parent pid if -S, --sig-parent is specified. */ |
4585 | if (opt_sig_parent) { | |
4586 | ppid = getppid(); | |
4587 | } | |
4588 | ||
7a485870 | 4589 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4590 | if (is_root && !opt_no_kernel) { |
4591 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4592 | goto exit; | |
4593 | } | |
7a485870 DG |
4594 | } |
4595 | ||
0b2dc8df MD |
4596 | /* Setup the thread ht_cleanup communication pipe. */ |
4597 | if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) { | |
4598 | goto exit; | |
4599 | } | |
4600 | ||
099e26bd | 4601 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4602 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4603 | goto exit; |
4604 | } | |
4605 | ||
d0b96690 DG |
4606 | /* Setup the thread apps notify communication pipe. */ |
4607 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
4608 | goto exit; | |
4609 | } | |
4610 | ||
7972aab2 DG |
4611 | /* Initialize global buffer per UID and PID registry. */ |
4612 | buffer_reg_init_uid_registry(); | |
4613 | buffer_reg_init_pid_registry(); | |
4614 | ||
099e26bd DG |
4615 | /* Init UST command queue. */ |
4616 | cds_wfq_init(&ust_cmd_queue.queue); | |
4617 | ||
273ea72c | 4618 | /* |
54d01ffb DG |
4619 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4620 | * statically declared in session.c | |
273ea72c | 4621 | */ |
54d01ffb | 4622 | session_list_ptr = session_get_list(); |
b5541356 | 4623 | |
5eb91c98 DG |
4624 | /* Set up max poll set size */ |
4625 | lttng_poll_set_max_size(); | |
4626 | ||
2f77fc4b | 4627 | cmd_init(); |
00e2e675 | 4628 | |
ae9e45b3 DG |
4629 | /* Check for the application socket timeout env variable. */ |
4630 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4631 | if (env_app_timeout) { | |
4632 | app_socket_timeout = atoi(env_app_timeout); | |
4633 | } else { | |
4634 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4635 | } | |
4636 | ||
35f90c40 DG |
4637 | write_pidfile(); |
4638 | ||
554831e7 MD |
4639 | /* Initialize communication library */ |
4640 | lttcomm_init(); | |
4641 | ||
0b2dc8df MD |
4642 | /* Create thread to manage the client socket */ |
4643 | ret = pthread_create(&ht_cleanup_thread, NULL, | |
4644 | thread_ht_cleanup, (void *) NULL); | |
4645 | if (ret != 0) { | |
4646 | PERROR("pthread_create ht_cleanup"); | |
4647 | goto exit_ht_cleanup; | |
4648 | } | |
4649 | ||
44a5e5eb DG |
4650 | /* Create thread to manage the client socket */ |
4651 | ret = pthread_create(&health_thread, NULL, | |
4652 | thread_manage_health, (void *) NULL); | |
4653 | if (ret != 0) { | |
4654 | PERROR("pthread_create health"); | |
4655 | goto exit_health; | |
4656 | } | |
4657 | ||
cf3af59e | 4658 | /* Create thread to manage the client socket */ |
099e26bd DG |
4659 | ret = pthread_create(&client_thread, NULL, |
4660 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4661 | if (ret != 0) { |
76d7553f | 4662 | PERROR("pthread_create clients"); |
cf3af59e MD |
4663 | goto exit_client; |
4664 | } | |
fac6795d | 4665 | |
099e26bd DG |
4666 | /* Create thread to dispatch registration */ |
4667 | ret = pthread_create(&dispatch_thread, NULL, | |
4668 | thread_dispatch_ust_registration, (void *) NULL); | |
4669 | if (ret != 0) { | |
76d7553f | 4670 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4671 | goto exit_dispatch; |
4672 | } | |
4673 | ||
4674 | /* Create thread to manage application registration. */ | |
4675 | ret = pthread_create(®_apps_thread, NULL, | |
4676 | thread_registration_apps, (void *) NULL); | |
4677 | if (ret != 0) { | |
76d7553f | 4678 | PERROR("pthread_create registration"); |
099e26bd DG |
4679 | goto exit_reg_apps; |
4680 | } | |
4681 | ||
cf3af59e | 4682 | /* Create thread to manage application socket */ |
54d01ffb DG |
4683 | ret = pthread_create(&apps_thread, NULL, |
4684 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4685 | if (ret != 0) { |
d0b96690 DG |
4686 | PERROR("pthread_create apps"); |
4687 | goto exit_apps; | |
4688 | } | |
4689 | ||
4690 | /* Create thread to manage application notify socket */ | |
4691 | ret = pthread_create(&apps_notify_thread, NULL, | |
4692 | ust_thread_manage_notify, (void *) NULL); | |
4693 | if (ret != 0) { | |
76d7553f | 4694 | PERROR("pthread_create apps"); |
cf3af59e MD |
4695 | goto exit_apps; |
4696 | } | |
fac6795d | 4697 | |
6620da75 DG |
4698 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4699 | if (is_root && !opt_no_kernel) { | |
4700 | /* Create kernel thread to manage kernel event */ | |
4701 | ret = pthread_create(&kernel_thread, NULL, | |
4702 | thread_manage_kernel, (void *) NULL); | |
4703 | if (ret != 0) { | |
4704 | PERROR("pthread_create kernel"); | |
4705 | goto exit_kernel; | |
4706 | } | |
7a485870 | 4707 | |
6620da75 DG |
4708 | ret = pthread_join(kernel_thread, &status); |
4709 | if (ret != 0) { | |
4710 | PERROR("pthread_join"); | |
4711 | goto error; /* join error, exit without cleanup */ | |
4712 | } | |
fac6795d DG |
4713 | } |
4714 | ||
cf3af59e MD |
4715 | exit_kernel: |
4716 | ret = pthread_join(apps_thread, &status); | |
4717 | if (ret != 0) { | |
76d7553f | 4718 | PERROR("pthread_join"); |
cf3af59e MD |
4719 | goto error; /* join error, exit without cleanup */ |
4720 | } | |
fac6795d | 4721 | |
cf3af59e | 4722 | exit_apps: |
099e26bd DG |
4723 | ret = pthread_join(reg_apps_thread, &status); |
4724 | if (ret != 0) { | |
76d7553f | 4725 | PERROR("pthread_join"); |
099e26bd DG |
4726 | goto error; /* join error, exit without cleanup */ |
4727 | } | |
4728 | ||
4729 | exit_reg_apps: | |
4730 | ret = pthread_join(dispatch_thread, &status); | |
4731 | if (ret != 0) { | |
76d7553f | 4732 | PERROR("pthread_join"); |
099e26bd DG |
4733 | goto error; /* join error, exit without cleanup */ |
4734 | } | |
4735 | ||
4736 | exit_dispatch: | |
cf3af59e MD |
4737 | ret = pthread_join(client_thread, &status); |
4738 | if (ret != 0) { | |
76d7553f | 4739 | PERROR("pthread_join"); |
cf3af59e MD |
4740 | goto error; /* join error, exit without cleanup */ |
4741 | } | |
4742 | ||
3bd1e081 | 4743 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4744 | if (ret != 0) { |
76d7553f | 4745 | PERROR("join_consumer"); |
cf3af59e MD |
4746 | goto error; /* join error, exit without cleanup */ |
4747 | } | |
a88df331 | 4748 | |
06f525de DG |
4749 | ret = join_consumer_thread(&ustconsumer32_data); |
4750 | if (ret != 0) { | |
4751 | PERROR("join_consumer ust32"); | |
4752 | goto error; /* join error, exit without cleanup */ | |
4753 | } | |
4754 | ||
4755 | ret = join_consumer_thread(&ustconsumer64_data); | |
4756 | if (ret != 0) { | |
4757 | PERROR("join_consumer ust64"); | |
4758 | goto error; /* join error, exit without cleanup */ | |
4759 | } | |
4760 | ||
cf3af59e | 4761 | exit_client: |
06f525de DG |
4762 | ret = pthread_join(health_thread, &status); |
4763 | if (ret != 0) { | |
4764 | PERROR("pthread_join health thread"); | |
4765 | goto error; /* join error, exit without cleanup */ | |
4766 | } | |
4767 | ||
44a5e5eb | 4768 | exit_health: |
0b2dc8df MD |
4769 | ret = pthread_join(ht_cleanup_thread, &status); |
4770 | if (ret != 0) { | |
4771 | PERROR("pthread_join ht cleanup thread"); | |
4772 | goto error; /* join error, exit without cleanup */ | |
4773 | } | |
4774 | exit_ht_cleanup: | |
a88df331 | 4775 | exit: |
cf3af59e MD |
4776 | /* |
4777 | * cleanup() is called when no other thread is running. | |
4778 | */ | |
f6a9efaa | 4779 | rcu_thread_online(); |
cf3af59e | 4780 | cleanup(); |
f6a9efaa DG |
4781 | rcu_thread_offline(); |
4782 | rcu_unregister_thread(); | |
67e40797 | 4783 | if (!ret) { |
cf3af59e | 4784 | exit(EXIT_SUCCESS); |
67e40797 | 4785 | } |
cf3af59e | 4786 | error: |
5e16da05 | 4787 | exit(EXIT_FAILURE); |
fac6795d | 4788 | } |