Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
91d76f53 | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
fac6795d DG |
20 | #include <getopt.h> |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
0fdd1e2c | 28 | #include <sys/mman.h> |
b73401da | 29 | #include <sys/mount.h> |
1e307fab | 30 | #include <sys/resource.h> |
fac6795d DG |
31 | #include <sys/socket.h> |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
0fdd1e2c | 34 | #include <sys/wait.h> |
5c827ce0 | 35 | #include <urcu/uatomic.h> |
fac6795d | 36 | #include <unistd.h> |
3bd1e081 | 37 | #include <config.h> |
fac6795d | 38 | |
990570ed | 39 | #include <common/common.h> |
0ba98ebc | 40 | #include <common/compat/poll.h> |
d27c42b8 | 41 | #include <common/compat/socket.h> |
db758600 DG |
42 | #include <common/defaults.h> |
43 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 44 | #include <common/futex.h> |
00e2e675 | 45 | #include <common/relayd/relayd.h> |
81b86775 | 46 | #include <common/utils.h> |
fac6795d | 47 | |
10a8a223 | 48 | #include "lttng-sessiond.h" |
54d01ffb | 49 | #include "channel.h" |
2f77fc4b | 50 | #include "cmd.h" |
00e2e675 | 51 | #include "consumer.h" |
099e26bd | 52 | #include "context.h" |
54d01ffb | 53 | #include "event.h" |
4771f025 | 54 | #include "kernel.h" |
f1e16794 | 55 | #include "kernel-consumer.h" |
096102bd | 56 | #include "modprobe.h" |
0fdd1e2c | 57 | #include "shm.h" |
1e307fab | 58 | #include "ust-ctl.h" |
00e2e675 | 59 | #include "ust-consumer.h" |
8e68d1c8 | 60 | #include "utils.h" |
4063050c | 61 | #include "fd-limit.h" |
44a5e5eb | 62 | #include "health.h" |
8ac94142 | 63 | #include "testpoint.h" |
fac6795d | 64 | |
ebaeda94 MD |
65 | #define CONSUMERD_FILE "lttng-consumerd" |
66 | ||
75462a81 | 67 | /* Const values */ |
686204ab | 68 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
bbccc3d2 | 69 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab MD |
70 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
71 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
72 | ||
fac6795d DG |
73 | const char *progname; |
74 | const char *opt_tracing_group; | |
35f90c40 | 75 | static const char *opt_pidfile; |
5b8719f5 | 76 | static int opt_sig_parent; |
97e19046 | 77 | static int opt_verbose_consumer; |
fac6795d | 78 | static int opt_daemon; |
4fba7219 | 79 | static int opt_no_kernel; |
fac6795d | 80 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 81 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 82 | static char *rundir; |
3bd1e081 | 83 | |
a23ec3a7 DG |
84 | /* |
85 | * Consumer daemon specific control data. Every value not initialized here is | |
86 | * set to 0 by the static definition. | |
87 | */ | |
3bd1e081 MD |
88 | static struct consumer_data kconsumer_data = { |
89 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
90 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
91 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
92 | .err_sock = -1, |
93 | .cmd_sock = -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, | |
173af62f DG |
105 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
106 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
107 | .cond = PTHREAD_COND_INITIALIZER, |
108 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
109 | }; |
110 | static struct consumer_data ustconsumer32_data = { | |
111 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
112 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
113 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
114 | .err_sock = -1, |
115 | .cmd_sock = -1, | |
173af62f DG |
116 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
117 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
118 | .cond = PTHREAD_COND_INITIALIZER, |
119 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
120 | }; |
121 | ||
26c9d55e | 122 | /* Shared between threads */ |
099e26bd | 123 | static int dispatch_thread_exit; |
fac6795d | 124 | |
54d01ffb DG |
125 | /* Global application Unix socket path */ |
126 | static char apps_unix_sock_path[PATH_MAX]; | |
127 | /* Global client Unix socket path */ | |
128 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
129 | /* global wait shm path for UST */ |
130 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
131 | /* Global health check unix path */ |
132 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 133 | |
1d4b027a | 134 | /* Sockets and FDs */ |
a4b35e07 MD |
135 | static int client_sock = -1; |
136 | static int apps_sock = -1; | |
2f77fc4b | 137 | int kernel_tracer_fd = -1; |
76d7553f | 138 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 139 | |
273ea72c DG |
140 | /* |
141 | * Quit pipe for all threads. This permits a single cancellation point | |
142 | * for all threads when receiving an event on the pipe. | |
143 | */ | |
76d7553f | 144 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 145 | |
099e26bd DG |
146 | /* |
147 | * This pipe is used to inform the thread managing application communication | |
148 | * that a command is queued and ready to be processed. | |
149 | */ | |
76d7553f | 150 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 151 | |
1d4b027a | 152 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 153 | static pthread_t apps_thread; |
099e26bd | 154 | static pthread_t reg_apps_thread; |
1d4b027a | 155 | static pthread_t client_thread; |
7a485870 | 156 | static pthread_t kernel_thread; |
099e26bd | 157 | static pthread_t dispatch_thread; |
44a5e5eb | 158 | static pthread_t health_thread; |
5eb91c98 | 159 | |
099e26bd DG |
160 | /* |
161 | * UST registration command queue. This queue is tied with a futex and uses a N | |
162 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
163 | * | |
164 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
165 | * this queue and the wait/wake scheme. | |
166 | */ | |
167 | static struct ust_cmd_queue ust_cmd_queue; | |
168 | ||
b5541356 DG |
169 | /* |
170 | * Pointer initialized before thread creation. | |
171 | * | |
172 | * This points to the tracing session list containing the session count and a | |
173 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
174 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 175 | * |
d063d709 | 176 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 177 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
178 | */ |
179 | static struct ltt_session_list *session_list_ptr; | |
180 | ||
7753dea8 MD |
181 | int ust_consumerd64_fd = -1; |
182 | int ust_consumerd32_fd = -1; | |
183 | ||
fb6f1fa2 YB |
184 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
185 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
186 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
187 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 188 | |
2f77fc4b DG |
189 | static const char *module_proc_lttng = "/proc/lttng"; |
190 | ||
5c827ce0 DG |
191 | /* |
192 | * Consumer daemon state which is changed when spawning it, killing it or in | |
193 | * case of a fatal error. | |
194 | */ | |
195 | enum consumerd_state { | |
196 | CONSUMER_STARTED = 1, | |
197 | CONSUMER_STOPPED = 2, | |
198 | CONSUMER_ERROR = 3, | |
199 | }; | |
200 | ||
201 | /* | |
202 | * This consumer daemon state is used to validate if a client command will be | |
203 | * able to reach the consumer. If not, the client is informed. For instance, | |
204 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
205 | * error to the client. | |
206 | * | |
207 | * The following example shows a possible race condition of this scheme: | |
208 | * | |
209 | * consumer thread error happens | |
210 | * client cmd arrives | |
211 | * client cmd checks state -> still OK | |
212 | * consumer thread exit, sets error | |
213 | * client cmd try to talk to consumer | |
214 | * ... | |
215 | * | |
216 | * However, since the consumer is a different daemon, we have no way of making | |
217 | * sure the command will reach it safely even with this state flag. This is why | |
218 | * we consider that up to the state validation during command processing, the | |
219 | * command is safe. After that, we can not guarantee the correctness of the | |
220 | * client request vis-a-vis the consumer. | |
221 | */ | |
222 | static enum consumerd_state ust_consumerd_state; | |
223 | static enum consumerd_state kernel_consumerd_state; | |
224 | ||
44a5e5eb DG |
225 | /* Used for the health monitoring of the session daemon. See health.h */ |
226 | struct health_state health_thread_cmd; | |
139ac872 | 227 | struct health_state health_thread_app_manage; |
44a5e5eb DG |
228 | struct health_state health_thread_app_reg; |
229 | struct health_state health_thread_kernel; | |
230 | ||
ae9e45b3 DG |
231 | /* |
232 | * Socket timeout for receiving and sending in seconds. | |
233 | */ | |
234 | static int app_socket_timeout; | |
235 | ||
fb09408a | 236 | static |
7753dea8 | 237 | void setup_consumerd_path(void) |
fb09408a | 238 | { |
fc7a59ce | 239 | const char *bin, *libdir; |
fb09408a | 240 | |
7753dea8 MD |
241 | /* |
242 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
243 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
244 | * has not been defined. | |
7753dea8 | 245 | */ |
ebaeda94 | 246 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
247 | if (!consumerd32_bin[0]) { |
248 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
249 | } |
250 | if (!consumerd32_libdir[0]) { | |
251 | consumerd32_libdir = INSTALL_LIB_PATH; | |
252 | } | |
253 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
254 | if (!consumerd64_bin[0]) { |
255 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 256 | } |
ebaeda94 MD |
257 | if (!consumerd64_libdir[0]) { |
258 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
259 | } |
260 | #else | |
261 | #error "Unknown bitness" | |
262 | #endif | |
263 | ||
fb09408a MD |
264 | /* |
265 | * runtime env. var. overrides the build default. | |
266 | */ | |
fc7a59ce AM |
267 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
268 | if (bin) { | |
269 | consumerd32_bin = bin; | |
7753dea8 | 270 | } |
fc7a59ce AM |
271 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
272 | if (bin) { | |
273 | consumerd64_bin = bin; | |
ebaeda94 | 274 | } |
72f579ee | 275 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
276 | if (libdir) { |
277 | consumerd32_libdir = libdir; | |
278 | } | |
72f579ee | 279 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
280 | if (libdir) { |
281 | consumerd64_libdir = libdir; | |
fb09408a MD |
282 | } |
283 | } | |
284 | ||
5eb91c98 DG |
285 | /* |
286 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
287 | */ | |
288 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
289 | unsigned int size) | |
290 | { | |
291 | int ret; | |
292 | ||
293 | if (events == NULL || size == 0) { | |
294 | ret = -1; | |
295 | goto error; | |
296 | } | |
297 | ||
298 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
299 | if (ret < 0) { | |
300 | goto error; | |
301 | } | |
302 | ||
303 | /* Add quit pipe */ | |
304 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
305 | if (ret < 0) { | |
306 | goto error; | |
307 | } | |
308 | ||
309 | return 0; | |
310 | ||
311 | error: | |
312 | return ret; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Check if the thread quit pipe was triggered. | |
317 | * | |
318 | * Return 1 if it was triggered else 0; | |
319 | */ | |
320 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
321 | { | |
322 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
323 | return 1; | |
324 | } | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
0fdd1e2c DG |
329 | /* |
330 | * Return group ID of the tracing group or -1 if not found. | |
331 | */ | |
996b65c8 MD |
332 | static gid_t allowed_group(void) |
333 | { | |
334 | struct group *grp; | |
335 | ||
274e143b MD |
336 | if (opt_tracing_group) { |
337 | grp = getgrnam(opt_tracing_group); | |
338 | } else { | |
339 | grp = getgrnam(default_tracing_group); | |
340 | } | |
996b65c8 MD |
341 | if (!grp) { |
342 | return -1; | |
343 | } else { | |
344 | return grp->gr_gid; | |
345 | } | |
346 | } | |
347 | ||
273ea72c | 348 | /* |
5eb91c98 | 349 | * Init thread quit pipe. |
273ea72c DG |
350 | * |
351 | * Return -1 on error or 0 if all pipes are created. | |
352 | */ | |
353 | static int init_thread_quit_pipe(void) | |
354 | { | |
730389d9 | 355 | int ret, i; |
273ea72c | 356 | |
730389d9 | 357 | ret = pipe(thread_quit_pipe); |
273ea72c | 358 | if (ret < 0) { |
730389d9 | 359 | PERROR("thread quit pipe"); |
273ea72c DG |
360 | goto error; |
361 | } | |
362 | ||
730389d9 DG |
363 | for (i = 0; i < 2; i++) { |
364 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
365 | if (ret < 0) { | |
366 | PERROR("fcntl"); | |
367 | goto error; | |
368 | } | |
369 | } | |
370 | ||
273ea72c DG |
371 | error: |
372 | return ret; | |
373 | } | |
374 | ||
099e26bd DG |
375 | /* |
376 | * Stop all threads by closing the thread quit pipe. | |
377 | */ | |
cf3af59e MD |
378 | static void stop_threads(void) |
379 | { | |
5eb91c98 DG |
380 | int ret; |
381 | ||
cf3af59e MD |
382 | /* Stopping all threads */ |
383 | DBG("Terminating all threads"); | |
54d01ffb | 384 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
385 | if (ret < 0) { |
386 | ERR("write error on thread quit pipe"); | |
387 | } | |
388 | ||
099e26bd | 389 | /* Dispatch thread */ |
26c9d55e | 390 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 391 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
392 | } |
393 | ||
fac6795d | 394 | /* |
d063d709 | 395 | * Cleanup the daemon |
fac6795d | 396 | */ |
cf3af59e | 397 | static void cleanup(void) |
fac6795d | 398 | { |
ef599319 | 399 | int ret; |
6620da75 | 400 | char *cmd = NULL; |
af9737e9 | 401 | struct ltt_session *sess, *stmp; |
fac6795d | 402 | |
1d4b027a | 403 | DBG("Cleaning up"); |
e07ae692 | 404 | |
2f77fc4b DG |
405 | /* First thing first, stop all threads */ |
406 | utils_close_pipe(thread_quit_pipe); | |
407 | ||
35f90c40 DG |
408 | /* |
409 | * If opt_pidfile is undefined, the default file will be wiped when | |
410 | * removing the rundir. | |
411 | */ | |
412 | if (opt_pidfile) { | |
413 | ret = remove(opt_pidfile); | |
414 | if (ret < 0) { | |
415 | PERROR("remove pidfile %s", opt_pidfile); | |
416 | } | |
417 | } | |
418 | ||
67e40797 DG |
419 | DBG("Removing %s directory", rundir); |
420 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
421 | if (ret < 0) { | |
422 | ERR("asprintf failed. Something is really wrong!"); | |
423 | } | |
5461b305 | 424 | |
67e40797 DG |
425 | /* Remove lttng run directory */ |
426 | ret = system(cmd); | |
427 | if (ret < 0) { | |
428 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 429 | } |
67e40797 | 430 | free(cmd); |
bd69add2 | 431 | free(rundir); |
5461b305 | 432 | |
99bab54f | 433 | DBG("Cleaning up all sessions"); |
fac6795d | 434 | |
b5541356 | 435 | /* Destroy session list mutex */ |
273ea72c DG |
436 | if (session_list_ptr != NULL) { |
437 | pthread_mutex_destroy(&session_list_ptr->lock); | |
438 | ||
439 | /* Cleanup ALL session */ | |
54d01ffb DG |
440 | cds_list_for_each_entry_safe(sess, stmp, |
441 | &session_list_ptr->head, list) { | |
2f77fc4b | 442 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
443 | } |
444 | } | |
445 | ||
099e26bd | 446 | DBG("Closing all UST sockets"); |
56fff090 | 447 | ust_app_clean_list(); |
099e26bd | 448 | |
4fba7219 DG |
449 | if (is_root && !opt_no_kernel) { |
450 | DBG2("Closing kernel fd"); | |
a4b35e07 | 451 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
452 | ret = close(kernel_tracer_fd); |
453 | if (ret) { | |
454 | PERROR("close"); | |
455 | } | |
a4b35e07 | 456 | } |
2f50c8a3 | 457 | DBG("Unloading kernel modules"); |
096102bd | 458 | modprobe_remove_lttng_all(); |
2f50c8a3 | 459 | } |
2f77fc4b | 460 | |
421cb601 | 461 | /* <fun> */ |
f56a39af | 462 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
463 | "Matthew, BEET driven development works!%c[%dm", |
464 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
465 | /* </fun> */ | |
fac6795d DG |
466 | } |
467 | ||
e065084a | 468 | /* |
d063d709 | 469 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 470 | * |
d063d709 | 471 | * Return lttcomm error code. |
e065084a DG |
472 | */ |
473 | static int send_unix_sock(int sock, void *buf, size_t len) | |
474 | { | |
475 | /* Check valid length */ | |
c617c0c6 | 476 | if (len == 0) { |
e065084a DG |
477 | return -1; |
478 | } | |
479 | ||
480 | return lttcomm_send_unix_sock(sock, buf, len); | |
481 | } | |
482 | ||
5461b305 | 483 | /* |
d063d709 | 484 | * Free memory of a command context structure. |
5461b305 | 485 | */ |
a2fb29a5 | 486 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 487 | { |
a2fb29a5 DG |
488 | DBG("Clean command context structure"); |
489 | if (*cmd_ctx) { | |
490 | if ((*cmd_ctx)->llm) { | |
491 | free((*cmd_ctx)->llm); | |
5461b305 | 492 | } |
a2fb29a5 DG |
493 | if ((*cmd_ctx)->lsm) { |
494 | free((*cmd_ctx)->lsm); | |
5461b305 | 495 | } |
a2fb29a5 DG |
496 | free(*cmd_ctx); |
497 | *cmd_ctx = NULL; | |
5461b305 DG |
498 | } |
499 | } | |
500 | ||
fac6795d | 501 | /* |
0fdd1e2c | 502 | * Notify UST applications using the shm mmap futex. |
fac6795d | 503 | */ |
0fdd1e2c | 504 | static int notify_ust_apps(int active) |
fac6795d | 505 | { |
0fdd1e2c | 506 | char *wait_shm_mmap; |
fac6795d | 507 | |
0fdd1e2c | 508 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 509 | |
0fdd1e2c DG |
510 | /* See shm.c for this call implying mmap, shm and futex calls */ |
511 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
512 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
513 | goto error; |
514 | } | |
515 | ||
0fdd1e2c DG |
516 | /* Wake waiting process */ |
517 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
518 | ||
519 | /* Apps notified successfully */ | |
520 | return 0; | |
fac6795d DG |
521 | |
522 | error: | |
0fdd1e2c | 523 | return -1; |
fac6795d DG |
524 | } |
525 | ||
e065084a | 526 | /* |
d063d709 DG |
527 | * Setup the outgoing data buffer for the response (llm) by allocating the |
528 | * right amount of memory and copying the original information from the lsm | |
529 | * structure. | |
ca95a216 | 530 | * |
d063d709 | 531 | * Return total size of the buffer pointed by buf. |
ca95a216 | 532 | */ |
5461b305 | 533 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 534 | { |
f3ed775e | 535 | int ret, buf_size; |
ca95a216 | 536 | |
f3ed775e | 537 | buf_size = size; |
5461b305 | 538 | |
ba7f0ae5 | 539 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 540 | if (cmd_ctx->llm == NULL) { |
76d7553f | 541 | PERROR("zmalloc"); |
5461b305 | 542 | ret = -ENOMEM; |
ca95a216 DG |
543 | goto error; |
544 | } | |
545 | ||
5461b305 DG |
546 | /* Copy common data */ |
547 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 548 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 549 | |
5461b305 DG |
550 | cmd_ctx->llm->data_size = size; |
551 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
552 | ||
ca95a216 DG |
553 | return buf_size; |
554 | ||
555 | error: | |
556 | return ret; | |
557 | } | |
558 | ||
7a485870 | 559 | /* |
5eb91c98 | 560 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 561 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 562 | */ |
5eb91c98 | 563 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 564 | { |
5eb91c98 | 565 | int ret; |
7a485870 DG |
566 | struct ltt_session *session; |
567 | struct ltt_kernel_channel *channel; | |
568 | ||
5eb91c98 | 569 | DBG("Updating kernel poll set"); |
7a485870 | 570 | |
54d01ffb | 571 | session_lock_list(); |
b5541356 | 572 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 573 | session_lock(session); |
7a485870 | 574 | if (session->kernel_session == NULL) { |
54d01ffb | 575 | session_unlock(session); |
7a485870 DG |
576 | continue; |
577 | } | |
7a485870 | 578 | |
54d01ffb DG |
579 | cds_list_for_each_entry(channel, |
580 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
581 | /* Add channel fd to the kernel poll set */ |
582 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
583 | if (ret < 0) { | |
54d01ffb | 584 | session_unlock(session); |
5eb91c98 DG |
585 | goto error; |
586 | } | |
587 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 588 | } |
54d01ffb | 589 | session_unlock(session); |
7a485870 | 590 | } |
54d01ffb | 591 | session_unlock_list(); |
7a485870 | 592 | |
5eb91c98 | 593 | return 0; |
7a485870 DG |
594 | |
595 | error: | |
54d01ffb | 596 | session_unlock_list(); |
7a485870 DG |
597 | return -1; |
598 | } | |
599 | ||
600 | /* | |
54d01ffb | 601 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 602 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 603 | * |
d063d709 | 604 | * Useful for CPU hotplug feature. |
7a485870 | 605 | */ |
2bdd86d4 | 606 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
607 | { |
608 | int ret = 0; | |
609 | struct ltt_session *session; | |
173af62f | 610 | struct ltt_kernel_session *ksess; |
7a485870 DG |
611 | struct ltt_kernel_channel *channel; |
612 | ||
613 | DBG("Updating kernel streams for channel fd %d", fd); | |
614 | ||
54d01ffb | 615 | session_lock_list(); |
b5541356 | 616 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 617 | session_lock(session); |
7a485870 | 618 | if (session->kernel_session == NULL) { |
54d01ffb | 619 | session_unlock(session); |
7a485870 DG |
620 | continue; |
621 | } | |
173af62f | 622 | ksess = session->kernel_session; |
d9800920 | 623 | |
173af62f | 624 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
625 | if (channel->fd == fd) { |
626 | DBG("Channel found, updating kernel streams"); | |
627 | ret = kernel_open_channel_stream(channel); | |
628 | if (ret < 0) { | |
b3c750d2 | 629 | goto error; |
7a485870 | 630 | } |
d9800920 | 631 | |
7a485870 | 632 | /* |
5eb91c98 DG |
633 | * Have we already sent fds to the consumer? If yes, it means |
634 | * that tracing is started so it is safe to send our updated | |
635 | * stream fds. | |
7a485870 | 636 | */ |
173af62f DG |
637 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
638 | struct lttng_ht_iter iter; | |
639 | struct consumer_socket *socket; | |
640 | ||
e7fe706f | 641 | rcu_read_lock(); |
173af62f DG |
642 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
643 | &iter.iter, socket, node.node) { | |
644 | /* Code flow error */ | |
645 | assert(socket->fd >= 0); | |
646 | ||
647 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 648 | ret = kernel_consumer_send_channel_stream(socket, |
173af62f DG |
649 | channel, ksess); |
650 | pthread_mutex_unlock(socket->lock); | |
651 | if (ret < 0) { | |
e7fe706f | 652 | rcu_read_unlock(); |
173af62f DG |
653 | goto error; |
654 | } | |
7a485870 | 655 | } |
e7fe706f | 656 | rcu_read_unlock(); |
7a485870 | 657 | } |
b3c750d2 | 658 | goto error; |
7a485870 DG |
659 | } |
660 | } | |
54d01ffb | 661 | session_unlock(session); |
7a485870 | 662 | } |
54d01ffb | 663 | session_unlock_list(); |
b3c750d2 | 664 | return ret; |
7a485870 | 665 | |
b3c750d2 | 666 | error: |
54d01ffb DG |
667 | session_unlock(session); |
668 | session_unlock_list(); | |
7a485870 DG |
669 | return ret; |
670 | } | |
671 | ||
487cf67c DG |
672 | /* |
673 | * For each tracing session, update newly registered apps. | |
674 | */ | |
675 | static void update_ust_app(int app_sock) | |
676 | { | |
677 | struct ltt_session *sess, *stmp; | |
678 | ||
4ee14516 DG |
679 | session_lock_list(); |
680 | ||
487cf67c DG |
681 | /* For all tracing session(s) */ |
682 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 683 | session_lock(sess); |
421cb601 DG |
684 | if (sess->ust_session) { |
685 | ust_app_global_update(sess->ust_session, app_sock); | |
686 | } | |
4ee14516 | 687 | session_unlock(sess); |
487cf67c | 688 | } |
4ee14516 DG |
689 | |
690 | session_unlock_list(); | |
487cf67c DG |
691 | } |
692 | ||
7a485870 | 693 | /* |
d063d709 | 694 | * This thread manage event coming from the kernel. |
7a485870 | 695 | * |
d063d709 DG |
696 | * Features supported in this thread: |
697 | * -) CPU Hotplug | |
7a485870 DG |
698 | */ |
699 | static void *thread_manage_kernel(void *data) | |
700 | { | |
139ac872 | 701 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 702 | uint32_t revents, nb_fd; |
7a485870 | 703 | char tmp; |
5eb91c98 | 704 | struct lttng_poll_event events; |
7a485870 | 705 | |
6993eeb3 | 706 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 707 | |
927ca06a DG |
708 | health_register(HEALTH_TYPE_KERNEL); |
709 | ||
d5d63bf1 DG |
710 | /* |
711 | * This first step of the while is to clean this structure which could free | |
712 | * non NULL pointers so zero it before the loop. | |
713 | */ | |
714 | memset(&events, 0, sizeof(events)); | |
715 | ||
6993eeb3 CB |
716 | if (testpoint(thread_manage_kernel)) { |
717 | goto error_testpoint; | |
718 | } | |
8ac94142 | 719 | |
44a5e5eb DG |
720 | health_code_update(&health_thread_kernel); |
721 | ||
6993eeb3 | 722 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 723 | goto error_testpoint; |
6993eeb3 CB |
724 | } |
725 | ||
7a485870 | 726 | while (1) { |
44a5e5eb DG |
727 | health_code_update(&health_thread_kernel); |
728 | ||
7a485870 | 729 | if (update_poll_flag == 1) { |
d21b0d71 DG |
730 | /* Clean events object. We are about to populate it again. */ |
731 | lttng_poll_clean(&events); | |
732 | ||
733 | ret = create_thread_poll_set(&events, 2); | |
734 | if (ret < 0) { | |
735 | goto error_poll_create; | |
736 | } | |
737 | ||
738 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
739 | if (ret < 0) { | |
740 | goto error; | |
741 | } | |
5f822d0a | 742 | |
d21b0d71 | 743 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
744 | ret = update_kernel_poll(&events); |
745 | if (ret < 0) { | |
7a485870 DG |
746 | goto error; |
747 | } | |
748 | update_poll_flag = 0; | |
749 | } | |
750 | ||
d21b0d71 | 751 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
752 | |
753 | /* Poll infinite value of time */ | |
88f2b785 | 754 | restart: |
44a5e5eb | 755 | health_poll_update(&health_thread_kernel); |
5eb91c98 | 756 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 757 | health_poll_update(&health_thread_kernel); |
7a485870 | 758 | if (ret < 0) { |
88f2b785 MD |
759 | /* |
760 | * Restart interrupted system call. | |
761 | */ | |
762 | if (errno == EINTR) { | |
763 | goto restart; | |
764 | } | |
7a485870 DG |
765 | goto error; |
766 | } else if (ret == 0) { | |
767 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
768 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
769 | "This should not have happened! Continuing..."); | |
7a485870 DG |
770 | continue; |
771 | } | |
772 | ||
0d9c5d77 DG |
773 | nb_fd = ret; |
774 | ||
5eb91c98 DG |
775 | for (i = 0; i < nb_fd; i++) { |
776 | /* Fetch once the poll data */ | |
777 | revents = LTTNG_POLL_GETEV(&events, i); | |
778 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 779 | |
44a5e5eb DG |
780 | health_code_update(&health_thread_kernel); |
781 | ||
5eb91c98 DG |
782 | /* Thread quit pipe has been closed. Killing thread. */ |
783 | ret = check_thread_quit_pipe(pollfd, revents); | |
784 | if (ret) { | |
139ac872 MD |
785 | err = 0; |
786 | goto exit; | |
5eb91c98 | 787 | } |
7a485870 | 788 | |
5eb91c98 DG |
789 | /* Check for data on kernel pipe */ |
790 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
791 | do { |
792 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
793 | } while (ret < 0 && errno == EINTR); | |
794 | /* | |
795 | * Ret value is useless here, if this pipe gets any actions an | |
796 | * update is required anyway. | |
797 | */ | |
5eb91c98 DG |
798 | update_poll_flag = 1; |
799 | continue; | |
800 | } else { | |
801 | /* | |
802 | * New CPU detected by the kernel. Adding kernel stream to | |
803 | * kernel session and updating the kernel consumer | |
804 | */ | |
805 | if (revents & LPOLLIN) { | |
2bdd86d4 | 806 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
807 | if (ret < 0) { |
808 | continue; | |
809 | } | |
810 | break; | |
811 | /* | |
812 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
813 | * and unregister kernel stream at this point. | |
814 | */ | |
7a485870 | 815 | } |
7a485870 DG |
816 | } |
817 | } | |
818 | } | |
819 | ||
139ac872 | 820 | exit: |
7a485870 | 821 | error: |
5eb91c98 | 822 | lttng_poll_clean(&events); |
76d7553f | 823 | error_poll_create: |
6993eeb3 | 824 | error_testpoint: |
6620da75 DG |
825 | utils_close_pipe(kernel_poll_pipe); |
826 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 MD |
827 | if (err) { |
828 | health_error(&health_thread_kernel); | |
829 | ERR("Health error occurred in %s", __func__); | |
6620da75 DG |
830 | WARN("Kernel thread died unexpectedly. " |
831 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 832 | } |
927ca06a | 833 | health_unregister(); |
76d7553f | 834 | DBG("Kernel thread dying"); |
7a485870 DG |
835 | return NULL; |
836 | } | |
837 | ||
a23ec3a7 DG |
838 | /* |
839 | * Signal pthread condition of the consumer data that the thread. | |
840 | */ | |
841 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
842 | { | |
843 | pthread_mutex_lock(&data->cond_mutex); | |
844 | ||
845 | /* | |
846 | * The state is set before signaling. It can be any value, it's the waiter | |
847 | * job to correctly interpret this condition variable associated to the | |
848 | * consumer pthread_cond. | |
849 | * | |
850 | * A value of 0 means that the corresponding thread of the consumer data | |
851 | * was not started. 1 indicates that the thread has started and is ready | |
852 | * for action. A negative value means that there was an error during the | |
853 | * thread bootstrap. | |
854 | */ | |
855 | data->consumer_thread_is_ready = state; | |
856 | (void) pthread_cond_signal(&data->cond); | |
857 | ||
858 | pthread_mutex_unlock(&data->cond_mutex); | |
859 | } | |
860 | ||
1d4b027a | 861 | /* |
3bd1e081 | 862 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 863 | */ |
3bd1e081 | 864 | static void *thread_manage_consumer(void *data) |
1d4b027a | 865 | { |
139ac872 | 866 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 867 | uint32_t revents, nb_fd; |
1d4b027a | 868 | enum lttcomm_return_code code; |
5eb91c98 | 869 | struct lttng_poll_event events; |
3bd1e081 | 870 | struct consumer_data *consumer_data = data; |
1d4b027a | 871 | |
3bd1e081 | 872 | DBG("[thread] Manage consumer started"); |
1d4b027a | 873 | |
927ca06a DG |
874 | health_register(HEALTH_TYPE_CONSUMER); |
875 | ||
9449cc75 DG |
876 | /* |
877 | * Since the consumer thread can be spawned at any moment in time, we init | |
878 | * the health to a poll status (1, which is a valid health over time). | |
879 | * When the thread starts, we update here the health to a "code" path being | |
880 | * an even value so this thread, when reaching a poll wait, does not | |
881 | * trigger an error with an even value. | |
882 | * | |
883 | * Here is the use case we avoid. | |
884 | * | |
885 | * +1: the first poll update during initialization (main()) | |
886 | * +2 * x: multiple code update once in this thread. | |
887 | * +1: poll wait in this thread (being a good health state). | |
888 | * == even number which after the wait period shows as a bad health. | |
889 | * | |
890 | * In a nutshell, the following poll update to the health state brings back | |
891 | * the state to an even value meaning a code path. | |
892 | */ | |
893 | health_poll_update(&consumer_data->health); | |
894 | ||
5eb91c98 DG |
895 | /* |
896 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
897 | * Nothing more will be added to this poll set. | |
898 | */ | |
899 | ret = create_thread_poll_set(&events, 2); | |
900 | if (ret < 0) { | |
76d7553f | 901 | goto error_poll; |
5eb91c98 | 902 | } |
273ea72c | 903 | |
edb8b045 DG |
904 | /* |
905 | * The error socket here is already in a listening state which was done | |
906 | * just before spawning this thread to avoid a race between the consumer | |
907 | * daemon exec trying to connect and the listen() call. | |
908 | */ | |
3bd1e081 | 909 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
910 | if (ret < 0) { |
911 | goto error; | |
912 | } | |
913 | ||
44a5e5eb DG |
914 | health_code_update(&consumer_data->health); |
915 | ||
273ea72c | 916 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 917 | restart: |
44a5e5eb | 918 | health_poll_update(&consumer_data->health); |
8ac94142 | 919 | |
6993eeb3 CB |
920 | if (testpoint(thread_manage_consumer)) { |
921 | goto error; | |
922 | } | |
8ac94142 | 923 | |
5eb91c98 | 924 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 925 | health_poll_update(&consumer_data->health); |
273ea72c | 926 | if (ret < 0) { |
88f2b785 MD |
927 | /* |
928 | * Restart interrupted system call. | |
929 | */ | |
930 | if (errno == EINTR) { | |
931 | goto restart; | |
932 | } | |
273ea72c DG |
933 | goto error; |
934 | } | |
935 | ||
0d9c5d77 DG |
936 | nb_fd = ret; |
937 | ||
5eb91c98 DG |
938 | for (i = 0; i < nb_fd; i++) { |
939 | /* Fetch once the poll data */ | |
940 | revents = LTTNG_POLL_GETEV(&events, i); | |
941 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
942 | ||
44a5e5eb DG |
943 | health_code_update(&consumer_data->health); |
944 | ||
5eb91c98 DG |
945 | /* Thread quit pipe has been closed. Killing thread. */ |
946 | ret = check_thread_quit_pipe(pollfd, revents); | |
947 | if (ret) { | |
139ac872 MD |
948 | err = 0; |
949 | goto exit; | |
5eb91c98 DG |
950 | } |
951 | ||
952 | /* Event on the registration socket */ | |
3bd1e081 | 953 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 954 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 955 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
956 | goto error; |
957 | } | |
958 | } | |
273ea72c DG |
959 | } |
960 | ||
3bd1e081 | 961 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
962 | if (sock < 0) { |
963 | goto error; | |
964 | } | |
965 | ||
b662582b DG |
966 | /* |
967 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
968 | * show must go on. | |
969 | */ | |
970 | (void) utils_set_fd_cloexec(sock); | |
971 | ||
44a5e5eb DG |
972 | health_code_update(&consumer_data->health); |
973 | ||
3bd1e081 | 974 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 975 | |
712ea556 | 976 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
977 | ret = lttcomm_recv_unix_sock(sock, &code, |
978 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
979 | if (ret <= 0) { |
980 | goto error; | |
981 | } | |
982 | ||
44a5e5eb DG |
983 | health_code_update(&consumer_data->health); |
984 | ||
f73fabfd | 985 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 MD |
986 | consumer_data->cmd_sock = |
987 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
988 | if (consumer_data->cmd_sock < 0) { | |
a23ec3a7 DG |
989 | /* On error, signal condition and quit. */ |
990 | signal_consumer_condition(consumer_data, -1); | |
48842b30 | 991 | PERROR("consumer connect"); |
1d4b027a DG |
992 | goto error; |
993 | } | |
a23ec3a7 DG |
994 | signal_consumer_condition(consumer_data, 1); |
995 | DBG("Consumer command socket ready"); | |
1d4b027a | 996 | } else { |
3bd1e081 | 997 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
998 | lttcomm_get_readable_code(-code)); |
999 | goto error; | |
1000 | } | |
1001 | ||
54d01ffb | 1002 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1003 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1004 | if (ret < 0) { |
72079cae DG |
1005 | goto error; |
1006 | } | |
1007 | ||
5eb91c98 DG |
1008 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1009 | if (ret < 0) { | |
72079cae | 1010 | goto error; |
5eb91c98 DG |
1011 | } |
1012 | ||
44a5e5eb DG |
1013 | health_code_update(&consumer_data->health); |
1014 | ||
5eb91c98 | 1015 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 1016 | restart_poll: |
44a5e5eb | 1017 | health_poll_update(&consumer_data->health); |
5eb91c98 | 1018 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 1019 | health_poll_update(&consumer_data->health); |
5eb91c98 | 1020 | if (ret < 0) { |
88f2b785 MD |
1021 | /* |
1022 | * Restart interrupted system call. | |
1023 | */ | |
1024 | if (errno == EINTR) { | |
1025 | goto restart_poll; | |
1026 | } | |
72079cae DG |
1027 | goto error; |
1028 | } | |
1029 | ||
0d9c5d77 DG |
1030 | nb_fd = ret; |
1031 | ||
5eb91c98 DG |
1032 | for (i = 0; i < nb_fd; i++) { |
1033 | /* Fetch once the poll data */ | |
1034 | revents = LTTNG_POLL_GETEV(&events, i); | |
1035 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1036 | ||
44a5e5eb DG |
1037 | health_code_update(&consumer_data->health); |
1038 | ||
5eb91c98 DG |
1039 | /* Thread quit pipe has been closed. Killing thread. */ |
1040 | ret = check_thread_quit_pipe(pollfd, revents); | |
1041 | if (ret) { | |
139ac872 MD |
1042 | err = 0; |
1043 | goto exit; | |
5eb91c98 DG |
1044 | } |
1045 | ||
1046 | /* Event on the kconsumerd socket */ | |
1047 | if (pollfd == sock) { | |
1048 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1049 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1050 | goto error; |
1051 | } | |
1052 | } | |
1053 | } | |
1054 | ||
44a5e5eb DG |
1055 | health_code_update(&consumer_data->health); |
1056 | ||
712ea556 | 1057 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1058 | ret = lttcomm_recv_unix_sock(sock, &code, |
1059 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1060 | if (ret <= 0) { |
3bd1e081 | 1061 | ERR("consumer closed the command socket"); |
712ea556 | 1062 | goto error; |
6f61d021 | 1063 | } |
1d4b027a | 1064 | |
3bd1e081 | 1065 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1066 | |
139ac872 | 1067 | exit: |
1d4b027a | 1068 | error: |
5c827ce0 DG |
1069 | /* Immediately set the consumerd state to stopped */ |
1070 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1071 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1072 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1073 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1074 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1075 | } else { | |
1076 | /* Code flow error... */ | |
1077 | assert(0); | |
1078 | } | |
1079 | ||
76d7553f MD |
1080 | if (consumer_data->err_sock >= 0) { |
1081 | ret = close(consumer_data->err_sock); | |
1082 | if (ret) { | |
1083 | PERROR("close"); | |
1084 | } | |
1085 | } | |
1086 | if (consumer_data->cmd_sock >= 0) { | |
1087 | ret = close(consumer_data->cmd_sock); | |
1088 | if (ret) { | |
1089 | PERROR("close"); | |
1090 | } | |
1091 | } | |
1092 | if (sock >= 0) { | |
1093 | ret = close(sock); | |
1094 | if (ret) { | |
1095 | PERROR("close"); | |
1096 | } | |
1097 | } | |
273ea72c | 1098 | |
3bd1e081 MD |
1099 | unlink(consumer_data->err_unix_sock_path); |
1100 | unlink(consumer_data->cmd_unix_sock_path); | |
1101 | consumer_data->pid = 0; | |
1d4b027a | 1102 | |
5eb91c98 | 1103 | lttng_poll_clean(&events); |
76d7553f | 1104 | error_poll: |
139ac872 MD |
1105 | if (err) { |
1106 | health_error(&consumer_data->health); | |
1107 | ERR("Health error occurred in %s", __func__); | |
1108 | } | |
927ca06a | 1109 | health_unregister(); |
76d7553f | 1110 | DBG("consumer thread cleanup completed"); |
0177d773 | 1111 | |
5eb91c98 | 1112 | return NULL; |
099e26bd DG |
1113 | } |
1114 | ||
099e26bd DG |
1115 | /* |
1116 | * This thread manage application communication. | |
1d4b027a DG |
1117 | */ |
1118 | static void *thread_manage_apps(void *data) | |
099e26bd | 1119 | { |
139ac872 | 1120 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1121 | uint32_t revents, nb_fd; |
099e26bd | 1122 | struct ust_command ust_cmd; |
5eb91c98 | 1123 | struct lttng_poll_event events; |
099e26bd DG |
1124 | |
1125 | DBG("[thread] Manage application started"); | |
1126 | ||
f6a9efaa DG |
1127 | rcu_register_thread(); |
1128 | rcu_thread_online(); | |
1129 | ||
927ca06a DG |
1130 | health_register(HEALTH_TYPE_APP_MANAGE); |
1131 | ||
6993eeb3 CB |
1132 | if (testpoint(thread_manage_apps)) { |
1133 | goto error_testpoint; | |
1134 | } | |
1135 | ||
139ac872 | 1136 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1137 | |
5eb91c98 DG |
1138 | ret = create_thread_poll_set(&events, 2); |
1139 | if (ret < 0) { | |
76d7553f | 1140 | goto error_poll_create; |
5eb91c98 | 1141 | } |
099e26bd | 1142 | |
5eb91c98 DG |
1143 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1144 | if (ret < 0) { | |
1145 | goto error; | |
1146 | } | |
099e26bd | 1147 | |
6993eeb3 CB |
1148 | if (testpoint(thread_manage_apps_before_loop)) { |
1149 | goto error; | |
1150 | } | |
8ac94142 | 1151 | |
139ac872 | 1152 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1153 | |
5eb91c98 | 1154 | while (1) { |
d21b0d71 | 1155 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1156 | |
1157 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1158 | restart: |
139ac872 | 1159 | health_poll_update(&health_thread_app_manage); |
5eb91c98 | 1160 | ret = lttng_poll_wait(&events, -1); |
139ac872 | 1161 | health_poll_update(&health_thread_app_manage); |
099e26bd | 1162 | if (ret < 0) { |
88f2b785 MD |
1163 | /* |
1164 | * Restart interrupted system call. | |
1165 | */ | |
1166 | if (errno == EINTR) { | |
1167 | goto restart; | |
1168 | } | |
099e26bd DG |
1169 | goto error; |
1170 | } | |
1171 | ||
0d9c5d77 DG |
1172 | nb_fd = ret; |
1173 | ||
5eb91c98 DG |
1174 | for (i = 0; i < nb_fd; i++) { |
1175 | /* Fetch once the poll data */ | |
1176 | revents = LTTNG_POLL_GETEV(&events, i); | |
1177 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1178 | ||
139ac872 | 1179 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1180 | |
5eb91c98 DG |
1181 | /* Thread quit pipe has been closed. Killing thread. */ |
1182 | ret = check_thread_quit_pipe(pollfd, revents); | |
1183 | if (ret) { | |
139ac872 MD |
1184 | err = 0; |
1185 | goto exit; | |
5eb91c98 | 1186 | } |
099e26bd | 1187 | |
5eb91c98 DG |
1188 | /* Inspect the apps cmd pipe */ |
1189 | if (pollfd == apps_cmd_pipe[0]) { | |
1190 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1191 | ERR("Apps command pipe error"); | |
0177d773 | 1192 | goto error; |
5eb91c98 DG |
1193 | } else if (revents & LPOLLIN) { |
1194 | /* Empty pipe */ | |
f921c78f DG |
1195 | do { |
1196 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1197 | } while (ret < 0 && errno == EINTR); | |
5eb91c98 | 1198 | if (ret < 0 || ret < sizeof(ust_cmd)) { |
76d7553f | 1199 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1200 | goto error; |
1201 | } | |
099e26bd | 1202 | |
139ac872 | 1203 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1204 | |
5eb91c98 | 1205 | /* Register applicaton to the session daemon */ |
56fff090 | 1206 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1207 | ust_cmd.sock); |
88ff5b7f | 1208 | if (ret == -ENOMEM) { |
5eb91c98 | 1209 | goto error; |
88ff5b7f MD |
1210 | } else if (ret < 0) { |
1211 | break; | |
5eb91c98 DG |
1212 | } |
1213 | ||
139ac872 | 1214 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1215 | |
acc7b41b | 1216 | /* |
e0c7ec2b | 1217 | * Validate UST version compatibility. |
acc7b41b | 1218 | */ |
e0c7ec2b DG |
1219 | ret = ust_app_validate_version(ust_cmd.sock); |
1220 | if (ret >= 0) { | |
1221 | /* | |
1222 | * Add channel(s) and event(s) to newly registered apps | |
1223 | * from lttng global UST domain. | |
1224 | */ | |
1225 | update_ust_app(ust_cmd.sock); | |
1226 | } | |
acc7b41b | 1227 | |
139ac872 | 1228 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1229 | |
f2ca2e25 | 1230 | ret = ust_app_register_done(ust_cmd.sock); |
5eb91c98 DG |
1231 | if (ret < 0) { |
1232 | /* | |
1233 | * If the registration is not possible, we simply | |
1234 | * unregister the apps and continue | |
1235 | */ | |
56fff090 | 1236 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1237 | } else { |
1238 | /* | |
622c9ecf DG |
1239 | * We only monitor the error events of the socket. This |
1240 | * thread does not handle any incoming data from UST | |
1241 | * (POLLIN). | |
5eb91c98 | 1242 | */ |
622c9ecf DG |
1243 | ret = lttng_poll_add(&events, ust_cmd.sock, |
1244 | LPOLLERR & LPOLLHUP & LPOLLRDHUP); | |
5eb91c98 DG |
1245 | if (ret < 0) { |
1246 | goto error; | |
1247 | } | |
1248 | ||
ae9e45b3 DG |
1249 | /* Set socket timeout for both receiving and ending */ |
1250 | (void) lttcomm_setsockopt_rcv_timeout(ust_cmd.sock, | |
1251 | app_socket_timeout); | |
1252 | (void) lttcomm_setsockopt_snd_timeout(ust_cmd.sock, | |
1253 | app_socket_timeout); | |
1254 | ||
54d01ffb DG |
1255 | DBG("Apps with sock %d added to poll set", |
1256 | ust_cmd.sock); | |
5eb91c98 | 1257 | } |
487cf67c | 1258 | |
139ac872 | 1259 | health_code_update(&health_thread_app_manage); |
44a5e5eb | 1260 | |
5eb91c98 | 1261 | break; |
0177d773 | 1262 | } |
5eb91c98 DG |
1263 | } else { |
1264 | /* | |
54d01ffb DG |
1265 | * At this point, we know that a registered application made |
1266 | * the event at poll_wait. | |
5eb91c98 DG |
1267 | */ |
1268 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1269 | /* Removing from the poll set */ | |
1270 | ret = lttng_poll_del(&events, pollfd); | |
1271 | if (ret < 0) { | |
1272 | goto error; | |
1273 | } | |
099e26bd | 1274 | |
b9d9b220 | 1275 | /* Socket closed on remote end. */ |
56fff090 | 1276 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1277 | break; |
1278 | } | |
099e26bd | 1279 | } |
44a5e5eb | 1280 | |
139ac872 | 1281 | health_code_update(&health_thread_app_manage); |
099e26bd | 1282 | } |
099e26bd DG |
1283 | } |
1284 | ||
139ac872 | 1285 | exit: |
099e26bd | 1286 | error: |
5eb91c98 | 1287 | lttng_poll_clean(&events); |
76d7553f | 1288 | error_poll_create: |
6993eeb3 | 1289 | error_testpoint: |
6620da75 DG |
1290 | utils_close_pipe(apps_cmd_pipe); |
1291 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1292 | ||
1293 | /* | |
1294 | * We don't clean the UST app hash table here since already registered | |
1295 | * applications can still be controlled so let them be until the session | |
1296 | * daemon dies or the applications stop. | |
1297 | */ | |
1298 | ||
139ac872 MD |
1299 | if (err) { |
1300 | health_error(&health_thread_app_manage); | |
1301 | ERR("Health error occurred in %s", __func__); | |
1302 | } | |
927ca06a | 1303 | health_unregister(); |
76d7553f | 1304 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1305 | rcu_thread_offline(); |
1306 | rcu_unregister_thread(); | |
099e26bd DG |
1307 | return NULL; |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * Dispatch request from the registration threads to the application | |
1312 | * communication thread. | |
1313 | */ | |
1314 | static void *thread_dispatch_ust_registration(void *data) | |
1315 | { | |
1316 | int ret; | |
1317 | struct cds_wfq_node *node; | |
1318 | struct ust_command *ust_cmd = NULL; | |
1319 | ||
1320 | DBG("[thread] Dispatch UST command started"); | |
1321 | ||
26c9d55e | 1322 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
099e26bd DG |
1323 | /* Atomically prepare the queue futex */ |
1324 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1325 | ||
1326 | do { | |
1327 | /* Dequeue command for registration */ | |
1328 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1329 | if (node == NULL) { | |
00a17c97 | 1330 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1331 | /* Continue thread execution */ |
1332 | break; | |
1333 | } | |
1334 | ||
1335 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1336 | ||
2f50c8a3 DG |
1337 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1338 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1339 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1340 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1341 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1342 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1343 | /* |
1344 | * Inform apps thread of the new application registration. This | |
1345 | * call is blocking so we can be assured that the data will be read | |
1346 | * at some point in time or wait to the end of the world :) | |
1347 | */ | |
6620da75 | 1348 | if (apps_cmd_pipe[1] >= 0) { |
fbb3b395 DG |
1349 | do { |
1350 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1351 | sizeof(struct ust_command)); | |
1352 | } while (ret < 0 && errno == EINTR); | |
4cec016f | 1353 | if (ret < 0 || ret != sizeof(struct ust_command)) { |
6620da75 DG |
1354 | PERROR("write apps cmd pipe"); |
1355 | if (errno == EBADF) { | |
1356 | /* | |
1357 | * We can't inform the application thread to process | |
1358 | * registration. We will exit or else application | |
1359 | * registration will not occur and tracing will never | |
1360 | * start. | |
1361 | */ | |
1362 | goto error; | |
1363 | } | |
1364 | } | |
1365 | } else { | |
1366 | /* Application manager thread is not available. */ | |
1367 | ret = close(ust_cmd->sock); | |
1368 | if (ret < 0) { | |
1369 | PERROR("close ust_cmd sock"); | |
099e26bd DG |
1370 | } |
1371 | } | |
1372 | free(ust_cmd); | |
1373 | } while (node != NULL); | |
1374 | ||
1375 | /* Futex wait on queue. Blocking call on futex() */ | |
1376 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1377 | } | |
1378 | ||
1379 | error: | |
1380 | DBG("Dispatch thread dying"); | |
1381 | return NULL; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * This thread manage application registration. | |
1386 | */ | |
1387 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1388 | { |
139ac872 | 1389 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1390 | uint32_t revents, nb_fd; |
1391 | struct lttng_poll_event events; | |
099e26bd DG |
1392 | /* |
1393 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1394 | * freed in the manage apps thread. | |
1395 | */ | |
1396 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1397 | |
099e26bd | 1398 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1399 | |
927ca06a DG |
1400 | health_register(HEALTH_TYPE_APP_REG); |
1401 | ||
6993eeb3 CB |
1402 | if (testpoint(thread_registration_apps)) { |
1403 | goto error_testpoint; | |
1404 | } | |
8ac94142 | 1405 | |
1d4b027a DG |
1406 | ret = lttcomm_listen_unix_sock(apps_sock); |
1407 | if (ret < 0) { | |
76d7553f | 1408 | goto error_listen; |
1d4b027a DG |
1409 | } |
1410 | ||
5eb91c98 DG |
1411 | /* |
1412 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1413 | * more will be added to this poll set. | |
1414 | */ | |
1415 | ret = create_thread_poll_set(&events, 2); | |
1416 | if (ret < 0) { | |
76d7553f | 1417 | goto error_create_poll; |
5eb91c98 | 1418 | } |
273ea72c | 1419 | |
5eb91c98 DG |
1420 | /* Add the application registration socket */ |
1421 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1422 | if (ret < 0) { | |
76d7553f | 1423 | goto error_poll_add; |
5eb91c98 | 1424 | } |
273ea72c | 1425 | |
1d4b027a | 1426 | /* Notify all applications to register */ |
0fdd1e2c DG |
1427 | ret = notify_ust_apps(1); |
1428 | if (ret < 0) { | |
1429 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1430 | "Execution continues but there might be problem for already\n" |
1431 | "running applications that wishes to register."); | |
0fdd1e2c | 1432 | } |
1d4b027a DG |
1433 | |
1434 | while (1) { | |
1435 | DBG("Accepting application registration"); | |
273ea72c DG |
1436 | |
1437 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1438 | restart: |
139ac872 | 1439 | health_poll_update(&health_thread_app_reg); |
5eb91c98 | 1440 | ret = lttng_poll_wait(&events, -1); |
139ac872 | 1441 | health_poll_update(&health_thread_app_reg); |
273ea72c | 1442 | if (ret < 0) { |
88f2b785 MD |
1443 | /* |
1444 | * Restart interrupted system call. | |
1445 | */ | |
1446 | if (errno == EINTR) { | |
1447 | goto restart; | |
1448 | } | |
273ea72c DG |
1449 | goto error; |
1450 | } | |
1451 | ||
0d9c5d77 DG |
1452 | nb_fd = ret; |
1453 | ||
5eb91c98 | 1454 | for (i = 0; i < nb_fd; i++) { |
139ac872 MD |
1455 | health_code_update(&health_thread_app_reg); |
1456 | ||
5eb91c98 DG |
1457 | /* Fetch once the poll data */ |
1458 | revents = LTTNG_POLL_GETEV(&events, i); | |
1459 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1460 | |
5eb91c98 DG |
1461 | /* Thread quit pipe has been closed. Killing thread. */ |
1462 | ret = check_thread_quit_pipe(pollfd, revents); | |
1463 | if (ret) { | |
139ac872 MD |
1464 | err = 0; |
1465 | goto exit; | |
90014c57 | 1466 | } |
1d4b027a | 1467 | |
5eb91c98 DG |
1468 | /* Event on the registration socket */ |
1469 | if (pollfd == apps_sock) { | |
1470 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1471 | ERR("Register apps socket poll error"); | |
1472 | goto error; | |
1473 | } else if (revents & LPOLLIN) { | |
1474 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1475 | if (sock < 0) { | |
1476 | goto error; | |
1477 | } | |
099e26bd | 1478 | |
b662582b DG |
1479 | /* |
1480 | * Set the CLOEXEC flag. Return code is useless because | |
1481 | * either way, the show must go on. | |
1482 | */ | |
1483 | (void) utils_set_fd_cloexec(sock); | |
1484 | ||
5eb91c98 | 1485 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1486 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1487 | if (ust_cmd == NULL) { |
76d7553f | 1488 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1489 | goto error; |
1490 | } | |
1d4b027a | 1491 | |
5eb91c98 DG |
1492 | /* |
1493 | * Using message-based transmissions to ensure we don't | |
1494 | * have to deal with partially received messages. | |
1495 | */ | |
4063050c MD |
1496 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1497 | if (ret < 0) { | |
1498 | ERR("Exhausted file descriptors allowed for applications."); | |
1499 | free(ust_cmd); | |
1500 | ret = close(sock); | |
1501 | if (ret) { | |
1502 | PERROR("close"); | |
1503 | } | |
1504 | sock = -1; | |
1505 | continue; | |
1506 | } | |
139ac872 | 1507 | health_code_update(&health_thread_app_reg); |
5eb91c98 DG |
1508 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1509 | sizeof(struct ust_register_msg)); | |
1510 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1511 | if (ret < 0) { | |
76d7553f | 1512 | PERROR("lttcomm_recv_unix_sock register apps"); |
5eb91c98 DG |
1513 | } else { |
1514 | ERR("Wrong size received on apps register"); | |
1515 | } | |
1516 | free(ust_cmd); | |
76d7553f MD |
1517 | ret = close(sock); |
1518 | if (ret) { | |
1519 | PERROR("close"); | |
1520 | } | |
4063050c | 1521 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1522 | sock = -1; |
5eb91c98 DG |
1523 | continue; |
1524 | } | |
139ac872 | 1525 | health_code_update(&health_thread_app_reg); |
099e26bd | 1526 | |
5eb91c98 | 1527 | ust_cmd->sock = sock; |
34a2494f | 1528 | sock = -1; |
099e26bd | 1529 | |
5eb91c98 DG |
1530 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1531 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1532 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1533 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1534 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1535 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1536 | |
5eb91c98 DG |
1537 | /* |
1538 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1539 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1540 | */ |
1541 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1542 | ||
1543 | /* | |
1544 | * Wake the registration queue futex. Implicit memory | |
1545 | * barrier with the exchange in cds_wfq_enqueue. | |
1546 | */ | |
1547 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1548 | } | |
1549 | } | |
90014c57 | 1550 | } |
1d4b027a DG |
1551 | } |
1552 | ||
139ac872 | 1553 | exit: |
1d4b027a | 1554 | error: |
139ac872 MD |
1555 | if (err) { |
1556 | health_error(&health_thread_app_reg); | |
1557 | ERR("Health error occurred in %s", __func__); | |
1558 | } | |
139ac872 | 1559 | |
0fdd1e2c DG |
1560 | /* Notify that the registration thread is gone */ |
1561 | notify_ust_apps(0); | |
1562 | ||
a4b35e07 | 1563 | if (apps_sock >= 0) { |
76d7553f MD |
1564 | ret = close(apps_sock); |
1565 | if (ret) { | |
1566 | PERROR("close"); | |
1567 | } | |
a4b35e07 | 1568 | } |
46c3f085 | 1569 | if (sock >= 0) { |
76d7553f MD |
1570 | ret = close(sock); |
1571 | if (ret) { | |
1572 | PERROR("close"); | |
1573 | } | |
4063050c | 1574 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1575 | } |
273ea72c | 1576 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1577 | |
76d7553f | 1578 | error_poll_add: |
5eb91c98 | 1579 | lttng_poll_clean(&events); |
76d7553f MD |
1580 | error_listen: |
1581 | error_create_poll: | |
6993eeb3 | 1582 | error_testpoint: |
76d7553f | 1583 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1584 | health_unregister(); |
5eb91c98 | 1585 | |
1d4b027a DG |
1586 | return NULL; |
1587 | } | |
1588 | ||
8c0faa1d | 1589 | /* |
3bd1e081 | 1590 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1591 | * exec or it will fails. |
8c0faa1d | 1592 | */ |
3bd1e081 | 1593 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1594 | { |
a23ec3a7 | 1595 | int ret, clock_ret; |
ee0b0061 DG |
1596 | struct timespec timeout; |
1597 | ||
a23ec3a7 DG |
1598 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1599 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1600 | |
a23ec3a7 DG |
1601 | /* Setup pthread condition */ |
1602 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1603 | if (ret != 0) { | |
1604 | errno = ret; | |
1605 | PERROR("pthread_condattr_init consumer data"); | |
1606 | goto error; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1611 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1612 | * for a more details and how we noticed it. | |
1613 | */ | |
1614 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1615 | if (ret != 0) { | |
1616 | errno = ret; | |
1617 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1618 | goto error; |
1619 | } | |
8c0faa1d | 1620 | |
a23ec3a7 DG |
1621 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1622 | if (ret != 0) { | |
1623 | errno = ret; | |
1624 | PERROR("pthread_cond_init consumer data"); | |
1625 | goto error; | |
1626 | } | |
1627 | ||
1628 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1629 | consumer_data); | |
8c0faa1d | 1630 | if (ret != 0) { |
3bd1e081 | 1631 | PERROR("pthread_create consumer"); |
ee0b0061 | 1632 | ret = -1; |
8c0faa1d DG |
1633 | goto error; |
1634 | } | |
1635 | ||
a23ec3a7 DG |
1636 | /* We are about to wait on a pthread condition */ |
1637 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1638 | ||
ee0b0061 | 1639 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1640 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1641 | /* | |
1642 | * Set the timeout for the condition timed wait even if the clock gettime | |
1643 | * call fails since we might loop on that call and we want to avoid to | |
1644 | * increment the timeout too many times. | |
1645 | */ | |
1646 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1647 | ||
1648 | /* | |
1649 | * The following loop COULD be skipped in some conditions so this is why we | |
1650 | * set ret to 0 in order to make sure at least one round of the loop is | |
1651 | * done. | |
1652 | */ | |
1653 | ret = 0; | |
1654 | ||
1655 | /* | |
1656 | * Loop until the condition is reached or when a timeout is reached. Note | |
1657 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1658 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1659 | * possible. This loop does not take any chances and works with both of | |
1660 | * them. | |
1661 | */ | |
1662 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1663 | if (clock_ret < 0) { | |
1664 | PERROR("clock_gettime spawn consumer"); | |
1665 | /* Infinite wait for the consumerd thread to be ready */ | |
1666 | ret = pthread_cond_wait(&consumer_data->cond, | |
1667 | &consumer_data->cond_mutex); | |
1668 | } else { | |
1669 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1670 | &consumer_data->cond_mutex, &timeout); | |
1671 | } | |
ee0b0061 | 1672 | } |
8c0faa1d | 1673 | |
a23ec3a7 DG |
1674 | /* Release the pthread condition */ |
1675 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1676 | ||
1677 | if (ret != 0) { | |
1678 | errno = ret; | |
1679 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1680 | /* |
1681 | * Call has timed out so we kill the kconsumerd_thread and return | |
1682 | * an error. | |
1683 | */ | |
a23ec3a7 DG |
1684 | ERR("Condition timed out. The consumer thread was never ready." |
1685 | " Killing it"); | |
3bd1e081 | 1686 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1687 | if (ret < 0) { |
3bd1e081 | 1688 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1689 | } |
1690 | } else { | |
a23ec3a7 | 1691 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1692 | } |
1693 | goto error; | |
1694 | } | |
1695 | ||
3bd1e081 MD |
1696 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1697 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 1698 | ERR("Consumerd did not start"); |
3bd1e081 | 1699 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1700 | goto error; |
1701 | } | |
3bd1e081 | 1702 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1703 | |
8c0faa1d DG |
1704 | return 0; |
1705 | ||
1706 | error: | |
1707 | return ret; | |
1708 | } | |
1709 | ||
d9800920 | 1710 | /* |
3bd1e081 | 1711 | * Join consumer thread |
d9800920 | 1712 | */ |
3bd1e081 | 1713 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1714 | { |
1715 | void *status; | |
cf3af59e | 1716 | |
e8209f6b DG |
1717 | /* Consumer pid must be a real one. */ |
1718 | if (consumer_data->pid > 0) { | |
c617c0c6 | 1719 | int ret; |
3bd1e081 | 1720 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 1721 | if (ret) { |
3bd1e081 | 1722 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1723 | return ret; |
1724 | } | |
3bd1e081 | 1725 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1726 | } else { |
1727 | return 0; | |
1728 | } | |
1729 | } | |
1730 | ||
8c0faa1d | 1731 | /* |
3bd1e081 | 1732 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1733 | * |
d063d709 | 1734 | * Return pid if successful else -1. |
8c0faa1d | 1735 | */ |
3bd1e081 | 1736 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1737 | { |
1738 | int ret; | |
1739 | pid_t pid; | |
94c55f17 | 1740 | const char *consumer_to_use; |
53086306 | 1741 | const char *verbosity; |
94c55f17 | 1742 | struct stat st; |
8c0faa1d | 1743 | |
3bd1e081 | 1744 | DBG("Spawning consumerd"); |
c49dc785 | 1745 | |
8c0faa1d DG |
1746 | pid = fork(); |
1747 | if (pid == 0) { | |
1748 | /* | |
3bd1e081 | 1749 | * Exec consumerd. |
8c0faa1d | 1750 | */ |
daee5345 | 1751 | if (opt_verbose_consumer) { |
53086306 DG |
1752 | verbosity = "--verbose"; |
1753 | } else { | |
1754 | verbosity = "--quiet"; | |
1755 | } | |
3bd1e081 MD |
1756 | switch (consumer_data->type) { |
1757 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1758 | /* |
c7704d57 DG |
1759 | * Find out which consumerd to execute. We will first try the |
1760 | * 64-bit path, then the sessiond's installation directory, and | |
1761 | * fallback on the 32-bit one, | |
94c55f17 | 1762 | */ |
63a799e8 AM |
1763 | DBG3("Looking for a kernel consumer at these locations:"); |
1764 | DBG3(" 1) %s", consumerd64_bin); | |
1765 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1766 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1767 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1768 | DBG3("Found location #1"); |
94c55f17 | 1769 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1770 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1771 | DBG3("Found location #2"); |
94c55f17 | 1772 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1773 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1774 | DBG3("Found location #3"); |
eb1e0bd4 | 1775 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1776 | } else { |
63a799e8 | 1777 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1778 | break; |
1779 | } | |
1780 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1781 | execl(consumer_to_use, | |
1782 | "lttng-consumerd", verbosity, "-k", | |
1783 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1784 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1785 | NULL); | |
3bd1e081 | 1786 | break; |
7753dea8 MD |
1787 | case LTTNG_CONSUMER64_UST: |
1788 | { | |
b1e0b6b6 | 1789 | char *tmpnew = NULL; |
8f4905da MD |
1790 | |
1791 | if (consumerd64_libdir[0] != '\0') { | |
1792 | char *tmp; | |
1793 | size_t tmplen; | |
1794 | ||
1795 | tmp = getenv("LD_LIBRARY_PATH"); | |
1796 | if (!tmp) { | |
1797 | tmp = ""; | |
1798 | } | |
1799 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1800 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1801 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1802 | if (!tmpnew) { | |
1803 | ret = -ENOMEM; | |
1804 | goto error; | |
1805 | } | |
1806 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1807 | strcat(tmpnew, consumerd64_libdir); | |
1808 | if (tmp[0] != '\0') { | |
1809 | strcat(tmpnew, ":"); | |
1810 | strcat(tmpnew, tmp); | |
1811 | } | |
1812 | ret = putenv(tmpnew); | |
1813 | if (ret) { | |
1814 | ret = -errno; | |
1815 | goto error; | |
1816 | } | |
1817 | } | |
94c55f17 | 1818 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1819 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1820 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1821 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1822 | NULL); | |
8f4905da MD |
1823 | if (consumerd64_libdir[0] != '\0') { |
1824 | free(tmpnew); | |
1825 | } | |
1826 | if (ret) { | |
1827 | goto error; | |
1828 | } | |
3bd1e081 | 1829 | break; |
7753dea8 MD |
1830 | } |
1831 | case LTTNG_CONSUMER32_UST: | |
1832 | { | |
937dde8e | 1833 | char *tmpnew = NULL; |
8f4905da MD |
1834 | |
1835 | if (consumerd32_libdir[0] != '\0') { | |
1836 | char *tmp; | |
1837 | size_t tmplen; | |
1838 | ||
1839 | tmp = getenv("LD_LIBRARY_PATH"); | |
1840 | if (!tmp) { | |
1841 | tmp = ""; | |
1842 | } | |
1843 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1844 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1845 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1846 | if (!tmpnew) { | |
1847 | ret = -ENOMEM; | |
1848 | goto error; | |
1849 | } | |
1850 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1851 | strcat(tmpnew, consumerd32_libdir); | |
1852 | if (tmp[0] != '\0') { | |
1853 | strcat(tmpnew, ":"); | |
1854 | strcat(tmpnew, tmp); | |
1855 | } | |
1856 | ret = putenv(tmpnew); | |
1857 | if (ret) { | |
1858 | ret = -errno; | |
1859 | goto error; | |
1860 | } | |
1861 | } | |
94c55f17 | 1862 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1863 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1864 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1865 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1866 | NULL); | |
8f4905da MD |
1867 | if (consumerd32_libdir[0] != '\0') { |
1868 | free(tmpnew); | |
1869 | } | |
1870 | if (ret) { | |
1871 | goto error; | |
1872 | } | |
7753dea8 MD |
1873 | break; |
1874 | } | |
3bd1e081 | 1875 | default: |
76d7553f | 1876 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1877 | exit(EXIT_FAILURE); |
1878 | } | |
8c0faa1d | 1879 | if (errno != 0) { |
76d7553f | 1880 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1881 | } |
1882 | exit(EXIT_FAILURE); | |
1883 | } else if (pid > 0) { | |
1884 | ret = pid; | |
8c0faa1d | 1885 | } else { |
76d7553f | 1886 | PERROR("start consumer fork"); |
8c0faa1d | 1887 | ret = -errno; |
8c0faa1d | 1888 | } |
8f4905da | 1889 | error: |
8c0faa1d DG |
1890 | return ret; |
1891 | } | |
1892 | ||
693bd40b | 1893 | /* |
3bd1e081 | 1894 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1895 | */ |
3bd1e081 | 1896 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 1897 | { |
c617c0c6 | 1898 | int ret; |
edb8b045 DG |
1899 | |
1900 | /* | |
1901 | * Set the listen() state on the socket since there is a possible race | |
1902 | * between the exec() of the consumer daemon and this call if place in the | |
1903 | * consumer thread. See bug #366 for more details. | |
1904 | */ | |
1905 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
1906 | if (ret < 0) { | |
1907 | goto error; | |
1908 | } | |
693bd40b | 1909 | |
3bd1e081 MD |
1910 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1911 | if (consumer_data->pid != 0) { | |
1912 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1913 | goto end; |
1914 | } | |
693bd40b | 1915 | |
3bd1e081 | 1916 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1917 | if (ret < 0) { |
3bd1e081 MD |
1918 | ERR("Spawning consumerd failed"); |
1919 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1920 | goto error; |
693bd40b | 1921 | } |
c49dc785 | 1922 | |
3bd1e081 MD |
1923 | /* Setting up the consumer_data pid */ |
1924 | consumer_data->pid = ret; | |
48842b30 | 1925 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1926 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1927 | |
3bd1e081 MD |
1928 | DBG2("Spawning consumer control thread"); |
1929 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1930 | if (ret < 0) { |
3bd1e081 | 1931 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1932 | goto error; |
1933 | } | |
1934 | ||
c49dc785 | 1935 | end: |
693bd40b DG |
1936 | return 0; |
1937 | ||
1938 | error: | |
edb8b045 DG |
1939 | /* Cleanup already created socket on error. */ |
1940 | if (consumer_data->err_sock >= 0) { | |
c617c0c6 MD |
1941 | int err; |
1942 | ||
edb8b045 DG |
1943 | err = close(consumer_data->err_sock); |
1944 | if (err < 0) { | |
1945 | PERROR("close consumer data error socket"); | |
1946 | } | |
1947 | } | |
693bd40b DG |
1948 | return ret; |
1949 | } | |
1950 | ||
44a5e5eb | 1951 | /* |
139ac872 MD |
1952 | * Compute health status of each consumer. If one of them is zero (bad |
1953 | * state), we return 0. | |
44a5e5eb DG |
1954 | */ |
1955 | static int check_consumer_health(void) | |
1956 | { | |
1957 | int ret; | |
1958 | ||
927ca06a | 1959 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
1960 | |
1961 | DBG3("Health consumer check %d", ret); | |
1962 | ||
1963 | return ret; | |
1964 | } | |
1965 | ||
b73401da | 1966 | /* |
096102bd | 1967 | * Setup necessary data for kernel tracer action. |
b73401da | 1968 | */ |
096102bd | 1969 | static int init_kernel_tracer(void) |
b73401da DG |
1970 | { |
1971 | int ret; | |
b73401da | 1972 | |
096102bd DG |
1973 | /* Modprobe lttng kernel modules */ |
1974 | ret = modprobe_lttng_control(); | |
b73401da | 1975 | if (ret < 0) { |
b73401da DG |
1976 | goto error; |
1977 | } | |
1978 | ||
096102bd DG |
1979 | /* Open debugfs lttng */ |
1980 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
1981 | if (kernel_tracer_fd < 0) { | |
1982 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
1983 | ret = -1; |
1984 | goto error_open; | |
54d01ffb DG |
1985 | } |
1986 | ||
2f77fc4b DG |
1987 | /* Validate kernel version */ |
1988 | ret = kernel_validate_version(kernel_tracer_fd); | |
1989 | if (ret < 0) { | |
1990 | goto error_version; | |
b551a063 | 1991 | } |
54d01ffb | 1992 | |
2f77fc4b DG |
1993 | ret = modprobe_lttng_data(); |
1994 | if (ret < 0) { | |
1995 | goto error_modules; | |
54d01ffb DG |
1996 | } |
1997 | ||
2f77fc4b DG |
1998 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
1999 | return 0; | |
2000 | ||
2001 | error_version: | |
2002 | modprobe_remove_lttng_control(); | |
2003 | ret = close(kernel_tracer_fd); | |
2004 | if (ret) { | |
2005 | PERROR("close"); | |
b551a063 | 2006 | } |
2f77fc4b | 2007 | kernel_tracer_fd = -1; |
f73fabfd | 2008 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2009 | |
2f77fc4b DG |
2010 | error_modules: |
2011 | ret = close(kernel_tracer_fd); | |
2012 | if (ret) { | |
2013 | PERROR("close"); | |
b551a063 | 2014 | } |
54d01ffb | 2015 | |
2f77fc4b DG |
2016 | error_open: |
2017 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2018 | |
2019 | error: | |
2f77fc4b DG |
2020 | WARN("No kernel tracer available"); |
2021 | kernel_tracer_fd = -1; | |
2022 | if (!is_root) { | |
f73fabfd | 2023 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2024 | } else { |
f73fabfd | 2025 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2026 | } |
54d01ffb DG |
2027 | } |
2028 | ||
2f77fc4b | 2029 | |
54d01ffb | 2030 | /* |
2f77fc4b DG |
2031 | * Copy consumer output from the tracing session to the domain session. The |
2032 | * function also applies the right modification on a per domain basis for the | |
2033 | * trace files destination directory. | |
54d01ffb | 2034 | */ |
2f77fc4b | 2035 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2036 | { |
2037 | int ret; | |
2f77fc4b DG |
2038 | const char *dir_name; |
2039 | struct consumer_output *consumer; | |
2040 | ||
2041 | assert(session); | |
2042 | assert(session->consumer); | |
54d01ffb | 2043 | |
b551a063 DG |
2044 | switch (domain) { |
2045 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2046 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2047 | /* |
2048 | * XXX: We should audit the session creation and what this function | |
2049 | * does "extra" in order to avoid a destroy since this function is used | |
2050 | * in the domain session creation (kernel and ust) only. Same for UST | |
2051 | * domain. | |
2052 | */ | |
2053 | if (session->kernel_session->consumer) { | |
2054 | consumer_destroy_output(session->kernel_session->consumer); | |
2055 | } | |
2f77fc4b DG |
2056 | session->kernel_session->consumer = |
2057 | consumer_copy_output(session->consumer); | |
2058 | /* Ease our life a bit for the next part */ | |
2059 | consumer = session->kernel_session->consumer; | |
2060 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2061 | break; |
2062 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2063 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2064 | if (session->ust_session->consumer) { |
2065 | consumer_destroy_output(session->ust_session->consumer); | |
2066 | } | |
2f77fc4b DG |
2067 | session->ust_session->consumer = |
2068 | consumer_copy_output(session->consumer); | |
2069 | /* Ease our life a bit for the next part */ | |
2070 | consumer = session->ust_session->consumer; | |
2071 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2072 | break; |
2073 | default: | |
f73fabfd | 2074 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2075 | goto error; |
2076 | } | |
2077 | ||
2f77fc4b | 2078 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2079 | strncat(consumer->subdir, dir_name, |
2080 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2081 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2082 | ||
f73fabfd | 2083 | ret = LTTNG_OK; |
54d01ffb DG |
2084 | |
2085 | error: | |
2086 | return ret; | |
2087 | } | |
2088 | ||
00e2e675 | 2089 | /* |
2f77fc4b | 2090 | * Create an UST session and add it to the session ust list. |
00e2e675 | 2091 | */ |
2f77fc4b DG |
2092 | static int create_ust_session(struct ltt_session *session, |
2093 | struct lttng_domain *domain) | |
00e2e675 DG |
2094 | { |
2095 | int ret; | |
2f77fc4b | 2096 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2097 | |
a4b92340 | 2098 | assert(session); |
2f77fc4b DG |
2099 | assert(domain); |
2100 | assert(session->consumer); | |
a4b92340 | 2101 | |
2f77fc4b DG |
2102 | switch (domain->type) { |
2103 | case LTTNG_DOMAIN_UST: | |
2104 | break; | |
2105 | default: | |
2106 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2107 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2108 | goto error; |
2109 | } | |
2110 | ||
2f77fc4b DG |
2111 | DBG("Creating UST session"); |
2112 | ||
fdd9eb17 | 2113 | lus = trace_ust_create_session(session->path, session->id); |
2f77fc4b | 2114 | if (lus == NULL) { |
f73fabfd | 2115 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2116 | goto error; |
2117 | } | |
2118 | ||
2f77fc4b DG |
2119 | lus->uid = session->uid; |
2120 | lus->gid = session->gid; | |
2121 | session->ust_session = lus; | |
00e2e675 | 2122 | |
2f77fc4b DG |
2123 | /* Copy session output to the newly created UST session */ |
2124 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2125 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2126 | goto error; |
2127 | } | |
2128 | ||
f73fabfd | 2129 | return LTTNG_OK; |
00e2e675 DG |
2130 | |
2131 | error: | |
2f77fc4b DG |
2132 | free(lus); |
2133 | session->ust_session = NULL; | |
00e2e675 DG |
2134 | return ret; |
2135 | } | |
2136 | ||
2137 | /* | |
2f77fc4b | 2138 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2139 | */ |
2f77fc4b | 2140 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2141 | { |
2142 | int ret; | |
a4b92340 | 2143 | |
2f77fc4b | 2144 | DBG("Creating kernel session"); |
00e2e675 | 2145 | |
2f77fc4b DG |
2146 | ret = kernel_create_session(session, kernel_tracer_fd); |
2147 | if (ret < 0) { | |
f73fabfd | 2148 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2149 | goto error; |
2150 | } | |
2151 | ||
2f77fc4b DG |
2152 | /* Code flow safety */ |
2153 | assert(session->kernel_session); | |
2154 | ||
2155 | /* Copy session output to the newly created Kernel session */ | |
2156 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2157 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2158 | goto error; |
2159 | } | |
2160 | ||
2f77fc4b DG |
2161 | /* Create directory(ies) on local filesystem. */ |
2162 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2163 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2164 | ret = run_as_mkdir_recursive( | |
2165 | session->kernel_session->consumer->dst.trace_path, | |
2166 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2167 | if (ret < 0) { | |
2168 | if (ret != -EEXIST) { | |
2169 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2170 | goto error; |
2171 | } | |
00e2e675 | 2172 | } |
2f77fc4b | 2173 | } |
00e2e675 | 2174 | |
2f77fc4b DG |
2175 | session->kernel_session->uid = session->uid; |
2176 | session->kernel_session->gid = session->gid; | |
00e2e675 | 2177 | |
f73fabfd | 2178 | return LTTNG_OK; |
00e2e675 | 2179 | |
2f77fc4b DG |
2180 | error: |
2181 | trace_kernel_destroy_session(session->kernel_session); | |
2182 | session->kernel_session = NULL; | |
2183 | return ret; | |
2184 | } | |
00e2e675 | 2185 | |
2f77fc4b DG |
2186 | /* |
2187 | * Count number of session permitted by uid/gid. | |
2188 | */ | |
2189 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2190 | { | |
2191 | unsigned int i = 0; | |
2192 | struct ltt_session *session; | |
07424f16 | 2193 | |
2f77fc4b DG |
2194 | DBG("Counting number of available session for UID %d GID %d", |
2195 | uid, gid); | |
2196 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2197 | /* |
2f77fc4b | 2198 | * Only list the sessions the user can control. |
00e2e675 | 2199 | */ |
2f77fc4b DG |
2200 | if (!session_access_ok(session, uid, gid)) { |
2201 | continue; | |
2202 | } | |
2203 | i++; | |
a4b92340 | 2204 | } |
2f77fc4b | 2205 | return i; |
00e2e675 DG |
2206 | } |
2207 | ||
54d01ffb DG |
2208 | /* |
2209 | * Process the command requested by the lttng client within the command | |
2210 | * context structure. This function make sure that the return structure (llm) | |
2211 | * is set and ready for transmission before returning. | |
2212 | * | |
2213 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2214 | * |
2215 | * "sock" is only used for special-case var. len data. | |
54d01ffb | 2216 | */ |
53a80697 MD |
2217 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2218 | int *sock_error) | |
54d01ffb | 2219 | { |
f73fabfd | 2220 | int ret = LTTNG_OK; |
44d3bd01 | 2221 | int need_tracing_session = 1; |
2e09ba09 | 2222 | int need_domain; |
54d01ffb DG |
2223 | |
2224 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2225 | ||
53a80697 MD |
2226 | *sock_error = 0; |
2227 | ||
2e09ba09 MD |
2228 | switch (cmd_ctx->lsm->cmd_type) { |
2229 | case LTTNG_CREATE_SESSION: | |
2230 | case LTTNG_DESTROY_SESSION: | |
2231 | case LTTNG_LIST_SESSIONS: | |
2232 | case LTTNG_LIST_DOMAINS: | |
2233 | case LTTNG_START_TRACE: | |
2234 | case LTTNG_STOP_TRACE: | |
6d805429 | 2235 | case LTTNG_DATA_PENDING: |
2e09ba09 | 2236 | need_domain = 0; |
3aace903 | 2237 | break; |
2e09ba09 MD |
2238 | default: |
2239 | need_domain = 1; | |
2240 | } | |
2241 | ||
2242 | if (opt_no_kernel && need_domain | |
2243 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2244 | if (!is_root) { |
f73fabfd | 2245 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2246 | } else { |
f73fabfd | 2247 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2248 | } |
4fba7219 DG |
2249 | goto error; |
2250 | } | |
2251 | ||
8d3113b2 DG |
2252 | /* Deny register consumer if we already have a spawned consumer. */ |
2253 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2254 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2255 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2256 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2257 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2258 | goto error; |
2259 | } | |
2260 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2261 | } | |
2262 | ||
54d01ffb DG |
2263 | /* |
2264 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2265 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2266 | * command. |
2267 | */ | |
2268 | switch(cmd_ctx->lsm->cmd_type) { | |
2269 | case LTTNG_LIST_SESSIONS: | |
2270 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2271 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2272 | case LTTNG_LIST_DOMAINS: |
2273 | case LTTNG_LIST_CHANNELS: | |
2274 | case LTTNG_LIST_EVENTS: | |
2275 | break; | |
2276 | default: | |
2277 | /* Setup lttng message with no payload */ | |
2278 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2279 | if (ret < 0) { | |
2280 | /* This label does not try to unlock the session */ | |
2281 | goto init_setup_error; | |
2282 | } | |
2283 | } | |
2284 | ||
2285 | /* Commands that DO NOT need a session. */ | |
2286 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2287 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 2288 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2289 | case LTTNG_LIST_SESSIONS: |
2290 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2291 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2292 | need_tracing_session = 0; |
54d01ffb DG |
2293 | break; |
2294 | default: | |
2295 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2296 | /* |
2297 | * We keep the session list lock across _all_ commands | |
2298 | * for now, because the per-session lock does not | |
2299 | * handle teardown properly. | |
2300 | */ | |
74babd95 | 2301 | session_lock_list(); |
54d01ffb DG |
2302 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2303 | if (cmd_ctx->session == NULL) { | |
2304 | if (cmd_ctx->lsm->session.name != NULL) { | |
f73fabfd | 2305 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2306 | } else { |
2307 | /* If no session name specified */ | |
f73fabfd | 2308 | ret = LTTNG_ERR_SELECT_SESS; |
54d01ffb DG |
2309 | } |
2310 | goto error; | |
2311 | } else { | |
2312 | /* Acquire lock for the session */ | |
2313 | session_lock(cmd_ctx->session); | |
2314 | } | |
2315 | break; | |
2316 | } | |
b389abbe | 2317 | |
2e09ba09 MD |
2318 | if (!need_domain) { |
2319 | goto skip_domain; | |
2320 | } | |
a4b92340 | 2321 | |
54d01ffb DG |
2322 | /* |
2323 | * Check domain type for specific "pre-action". | |
2324 | */ | |
2325 | switch (cmd_ctx->lsm->domain.type) { | |
2326 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2327 | if (!is_root) { |
f73fabfd | 2328 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2329 | goto error; |
2330 | } | |
2331 | ||
54d01ffb | 2332 | /* Kernel tracer check */ |
a4b35e07 | 2333 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2334 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2335 | ret = init_kernel_tracer(); |
2336 | if (ret != 0) { | |
54d01ffb DG |
2337 | goto error; |
2338 | } | |
2339 | } | |
5eb91c98 | 2340 | |
5c827ce0 DG |
2341 | /* Consumer is in an ERROR state. Report back to client */ |
2342 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2343 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2344 | goto error; |
2345 | } | |
2346 | ||
54d01ffb | 2347 | /* Need a session for kernel command */ |
44d3bd01 | 2348 | if (need_tracing_session) { |
54d01ffb | 2349 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2350 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2351 | if (ret < 0) { |
f73fabfd | 2352 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2353 | goto error; |
2354 | } | |
b389abbe | 2355 | } |
7d29a247 | 2356 | |
54d01ffb | 2357 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2358 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2359 | if (kconsumer_data.pid == 0 && | |
a4b92340 DG |
2360 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2361 | cmd_ctx->session->start_consumer) { | |
3bd1e081 MD |
2362 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2363 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2364 | if (ret < 0) { |
f73fabfd | 2365 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2366 | goto error; |
950131af | 2367 | } |
5c827ce0 | 2368 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2369 | } else { |
2370 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2371 | } |
173af62f | 2372 | |
a4b92340 DG |
2373 | /* |
2374 | * The consumer was just spawned so we need to add the socket to | |
2375 | * the consumer output of the session if exist. | |
2376 | */ | |
2377 | ret = consumer_create_socket(&kconsumer_data, | |
2378 | cmd_ctx->session->kernel_session->consumer); | |
2379 | if (ret < 0) { | |
2380 | goto error; | |
173af62f | 2381 | } |
0d0c377a | 2382 | } |
5c827ce0 | 2383 | |
54d01ffb | 2384 | break; |
2bdd86d4 | 2385 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2386 | { |
5c827ce0 DG |
2387 | /* Consumer is in an ERROR state. Report back to client */ |
2388 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2389 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2390 | goto error; |
2391 | } | |
2392 | ||
44d3bd01 | 2393 | if (need_tracing_session) { |
a4b92340 | 2394 | /* Create UST session if none exist. */ |
f6a9efaa | 2395 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2396 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2397 | &cmd_ctx->lsm->domain); |
f73fabfd | 2398 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2399 | goto error; |
2400 | } | |
2401 | } | |
00e2e675 | 2402 | |
7753dea8 MD |
2403 | /* Start the UST consumer daemons */ |
2404 | /* 64-bit */ | |
2405 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2406 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2407 | ustconsumer64_data.pid == 0 && |
a4b92340 DG |
2408 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2409 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2410 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2411 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2412 | if (ret < 0) { |
f73fabfd | 2413 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2414 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2415 | goto error; |
2416 | } | |
48842b30 | 2417 | |
173af62f | 2418 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2419 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2420 | } else { |
7753dea8 MD |
2421 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2422 | } | |
173af62f DG |
2423 | |
2424 | /* | |
2425 | * Setup socket for consumer 64 bit. No need for atomic access | |
2426 | * since it was set above and can ONLY be set in this thread. | |
2427 | */ | |
a4b92340 DG |
2428 | ret = consumer_create_socket(&ustconsumer64_data, |
2429 | cmd_ctx->session->ust_session->consumer); | |
2430 | if (ret < 0) { | |
2431 | goto error; | |
173af62f DG |
2432 | } |
2433 | ||
7753dea8 | 2434 | /* 32-bit */ |
fc7a59ce | 2435 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2436 | ustconsumer32_data.pid == 0 && |
a4b92340 DG |
2437 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER && |
2438 | cmd_ctx->session->start_consumer) { | |
7753dea8 MD |
2439 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2440 | ret = start_consumerd(&ustconsumer32_data); | |
2441 | if (ret < 0) { | |
f73fabfd | 2442 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2443 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2444 | goto error; |
2445 | } | |
5c827ce0 | 2446 | |
173af62f | 2447 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2448 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2449 | } else { |
2450 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2451 | } |
173af62f DG |
2452 | |
2453 | /* | |
2454 | * Setup socket for consumer 64 bit. No need for atomic access | |
2455 | * since it was set above and can ONLY be set in this thread. | |
2456 | */ | |
a4b92340 DG |
2457 | ret = consumer_create_socket(&ustconsumer32_data, |
2458 | cmd_ctx->session->ust_session->consumer); | |
2459 | if (ret < 0) { | |
2460 | goto error; | |
173af62f | 2461 | } |
44d3bd01 DG |
2462 | } |
2463 | break; | |
48842b30 | 2464 | } |
54d01ffb | 2465 | default: |
54d01ffb DG |
2466 | break; |
2467 | } | |
2e09ba09 | 2468 | skip_domain: |
33a2b854 | 2469 | |
5c827ce0 DG |
2470 | /* Validate consumer daemon state when start/stop trace command */ |
2471 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2472 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2473 | switch (cmd_ctx->lsm->domain.type) { | |
2474 | case LTTNG_DOMAIN_UST: | |
2475 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2476 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2477 | goto error; |
2478 | } | |
2479 | break; | |
2480 | case LTTNG_DOMAIN_KERNEL: | |
2481 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2482 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2483 | goto error; |
2484 | } | |
2485 | break; | |
2486 | } | |
2487 | } | |
2488 | ||
8e0af1b4 MD |
2489 | /* |
2490 | * Check that the UID or GID match that of the tracing session. | |
2491 | * The root user can interact with all sessions. | |
2492 | */ | |
2493 | if (need_tracing_session) { | |
2494 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2495 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2496 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2497 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2498 | goto error; |
2499 | } | |
2500 | } | |
2501 | ||
54d01ffb DG |
2502 | /* Process by command type */ |
2503 | switch (cmd_ctx->lsm->cmd_type) { | |
2504 | case LTTNG_ADD_CONTEXT: | |
2505 | { | |
2506 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2507 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2508 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2509 | break; |
2510 | } | |
2511 | case LTTNG_DISABLE_CHANNEL: | |
2512 | { | |
2513 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2514 | cmd_ctx->lsm->u.disable.channel_name); | |
2515 | break; | |
2516 | } | |
2517 | case LTTNG_DISABLE_EVENT: | |
2518 | { | |
2519 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2520 | cmd_ctx->lsm->u.disable.channel_name, | |
2521 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2522 | break; |
2523 | } | |
54d01ffb DG |
2524 | case LTTNG_DISABLE_ALL_EVENT: |
2525 | { | |
2bdd86d4 | 2526 | DBG("Disabling all events"); |
54d01ffb DG |
2527 | |
2528 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2529 | cmd_ctx->lsm->u.disable.channel_name); | |
2530 | break; | |
2531 | } | |
00e2e675 DG |
2532 | case LTTNG_DISABLE_CONSUMER: |
2533 | { | |
2534 | ret = cmd_disable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); | |
2535 | break; | |
2536 | } | |
54d01ffb DG |
2537 | case LTTNG_ENABLE_CHANNEL: |
2538 | { | |
aea829b3 | 2539 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2540 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2541 | break; |
2542 | } | |
00e2e675 DG |
2543 | case LTTNG_ENABLE_CONSUMER: |
2544 | { | |
a4b92340 DG |
2545 | /* |
2546 | * XXX: 0 means that this URI should be applied on the session. Should | |
2547 | * be a DOMAIN enuam. | |
2548 | */ | |
00e2e675 | 2549 | ret = cmd_enable_consumer(cmd_ctx->lsm->domain.type, cmd_ctx->session); |
f73fabfd | 2550 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2551 | goto error; |
2552 | } | |
2553 | ||
2554 | if (cmd_ctx->lsm->domain.type == 0) { | |
2555 | /* Add the URI for the UST session if a consumer is present. */ | |
2556 | if (cmd_ctx->session->ust_session && | |
2557 | cmd_ctx->session->ust_session->consumer) { | |
2558 | ret = cmd_enable_consumer(LTTNG_DOMAIN_UST, cmd_ctx->session); | |
2559 | } else if (cmd_ctx->session->kernel_session && | |
2560 | cmd_ctx->session->kernel_session->consumer) { | |
2561 | ret = cmd_enable_consumer(LTTNG_DOMAIN_KERNEL, | |
2562 | cmd_ctx->session); | |
2563 | } | |
2564 | } | |
00e2e675 DG |
2565 | break; |
2566 | } | |
54d01ffb DG |
2567 | case LTTNG_ENABLE_EVENT: |
2568 | { | |
2569 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2570 | cmd_ctx->lsm->u.enable.channel_name, | |
025faf73 | 2571 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2572 | break; |
2573 | } | |
2574 | case LTTNG_ENABLE_ALL_EVENT: | |
2575 | { | |
2bdd86d4 | 2576 | DBG("Enabling all events"); |
54d01ffb DG |
2577 | |
2578 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 | 2579 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2580 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2581 | break; |
2582 | } | |
052da939 | 2583 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2584 | { |
9f19cc17 | 2585 | struct lttng_event *events; |
54d01ffb | 2586 | ssize_t nb_events; |
052da939 | 2587 | |
54d01ffb DG |
2588 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2589 | if (nb_events < 0) { | |
f73fabfd | 2590 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2591 | ret = -nb_events; |
2592 | goto error; | |
2ef84c95 DG |
2593 | } |
2594 | ||
2595 | /* | |
2596 | * Setup lttng message with payload size set to the event list size in | |
2597 | * bytes and then copy list into the llm payload. | |
2598 | */ | |
052da939 | 2599 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2600 | if (ret < 0) { |
052da939 | 2601 | free(events); |
2ef84c95 DG |
2602 | goto setup_error; |
2603 | } | |
2604 | ||
2605 | /* Copy event list into message payload */ | |
9f19cc17 | 2606 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2607 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2608 | |
9f19cc17 | 2609 | free(events); |
2ef84c95 | 2610 | |
f73fabfd | 2611 | ret = LTTNG_OK; |
2ef84c95 DG |
2612 | break; |
2613 | } | |
f37d259d MD |
2614 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2615 | { | |
2616 | struct lttng_event_field *fields; | |
2617 | ssize_t nb_fields; | |
2618 | ||
a4b92340 DG |
2619 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2620 | &fields); | |
f37d259d | 2621 | if (nb_fields < 0) { |
f73fabfd | 2622 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2623 | ret = -nb_fields; |
2624 | goto error; | |
2625 | } | |
2626 | ||
2627 | /* | |
2628 | * Setup lttng message with payload size set to the event list size in | |
2629 | * bytes and then copy list into the llm payload. | |
2630 | */ | |
a4b92340 DG |
2631 | ret = setup_lttng_msg(cmd_ctx, |
2632 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2633 | if (ret < 0) { |
2634 | free(fields); | |
2635 | goto setup_error; | |
2636 | } | |
2637 | ||
2638 | /* Copy event list into message payload */ | |
2639 | memcpy(cmd_ctx->llm->payload, fields, | |
2640 | sizeof(struct lttng_event_field) * nb_fields); | |
2641 | ||
2642 | free(fields); | |
2643 | ||
f73fabfd | 2644 | ret = LTTNG_OK; |
f37d259d MD |
2645 | break; |
2646 | } | |
00e2e675 DG |
2647 | case LTTNG_SET_CONSUMER_URI: |
2648 | { | |
a4b92340 DG |
2649 | size_t nb_uri, len; |
2650 | struct lttng_uri *uris; | |
2651 | ||
2652 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2653 | len = nb_uri * sizeof(struct lttng_uri); | |
2654 | ||
2655 | if (nb_uri == 0) { | |
f73fabfd | 2656 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2657 | goto error; |
2658 | } | |
2659 | ||
2660 | uris = zmalloc(len); | |
2661 | if (uris == NULL) { | |
f73fabfd | 2662 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2663 | goto error; |
2664 | } | |
2665 | ||
2666 | /* Receive variable len data */ | |
77c7c900 | 2667 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2668 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2669 | if (ret <= 0) { | |
2670 | DBG("No URIs received from client... continuing"); | |
2671 | *sock_error = 1; | |
f73fabfd | 2672 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2673 | free(uris); |
a4b92340 DG |
2674 | goto error; |
2675 | } | |
2676 | ||
00e2e675 | 2677 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2678 | nb_uri, uris); |
f73fabfd | 2679 | if (ret != LTTNG_OK) { |
b1d41407 | 2680 | free(uris); |
a4b92340 DG |
2681 | goto error; |
2682 | } | |
2683 | ||
2684 | /* | |
2685 | * XXX: 0 means that this URI should be applied on the session. Should | |
2686 | * be a DOMAIN enuam. | |
2687 | */ | |
2688 | if (cmd_ctx->lsm->domain.type == 0) { | |
2689 | /* Add the URI for the UST session if a consumer is present. */ | |
2690 | if (cmd_ctx->session->ust_session && | |
2691 | cmd_ctx->session->ust_session->consumer) { | |
2692 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2693 | nb_uri, uris); | |
2694 | } else if (cmd_ctx->session->kernel_session && | |
2695 | cmd_ctx->session->kernel_session->consumer) { | |
2696 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2697 | cmd_ctx->session, nb_uri, uris); | |
2698 | } | |
2699 | } | |
2700 | ||
b1d41407 DG |
2701 | free(uris); |
2702 | ||
00e2e675 DG |
2703 | break; |
2704 | } | |
f3ed775e | 2705 | case LTTNG_START_TRACE: |
8c0faa1d | 2706 | { |
54d01ffb | 2707 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2708 | break; |
2709 | } | |
f3ed775e | 2710 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2711 | { |
54d01ffb | 2712 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2713 | break; |
2714 | } | |
5e16da05 MD |
2715 | case LTTNG_CREATE_SESSION: |
2716 | { | |
a4b92340 DG |
2717 | size_t nb_uri, len; |
2718 | struct lttng_uri *uris = NULL; | |
2719 | ||
2720 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2721 | len = nb_uri * sizeof(struct lttng_uri); | |
2722 | ||
2723 | if (nb_uri > 0) { | |
2724 | uris = zmalloc(len); | |
2725 | if (uris == NULL) { | |
f73fabfd | 2726 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2727 | goto error; |
2728 | } | |
2729 | ||
2730 | /* Receive variable len data */ | |
77c7c900 | 2731 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
2732 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2733 | if (ret <= 0) { | |
2734 | DBG("No URIs received from client... continuing"); | |
2735 | *sock_error = 1; | |
f73fabfd | 2736 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2737 | free(uris); |
a4b92340 DG |
2738 | goto error; |
2739 | } | |
2740 | ||
2741 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
2742 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 2743 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2744 | free(uris); |
a4b92340 DG |
2745 | goto error; |
2746 | } | |
2747 | } | |
2748 | ||
2749 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
2750 | &cmd_ctx->creds); | |
2751 | ||
b1d41407 DG |
2752 | free(uris); |
2753 | ||
00e2e675 DG |
2754 | break; |
2755 | } | |
5e16da05 MD |
2756 | case LTTNG_DESTROY_SESSION: |
2757 | { | |
2f77fc4b | 2758 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
2759 | |
2760 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 2761 | cmd_ctx->session = NULL; |
5461b305 | 2762 | break; |
5e16da05 | 2763 | } |
9f19cc17 | 2764 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2765 | { |
54d01ffb DG |
2766 | ssize_t nb_dom; |
2767 | struct lttng_domain *domains; | |
5461b305 | 2768 | |
54d01ffb DG |
2769 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2770 | if (nb_dom < 0) { | |
f73fabfd | 2771 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2772 | ret = -nb_dom; |
2773 | goto error; | |
ce3d728c | 2774 | } |
520ff687 | 2775 | |
54d01ffb | 2776 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2777 | if (ret < 0) { |
2778 | goto setup_error; | |
520ff687 | 2779 | } |
57167058 | 2780 | |
54d01ffb DG |
2781 | /* Copy event list into message payload */ |
2782 | memcpy(cmd_ctx->llm->payload, domains, | |
2783 | nb_dom * sizeof(struct lttng_domain)); | |
2784 | ||
2785 | free(domains); | |
5e16da05 | 2786 | |
f73fabfd | 2787 | ret = LTTNG_OK; |
5e16da05 MD |
2788 | break; |
2789 | } | |
9f19cc17 | 2790 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2791 | { |
6775595e | 2792 | int nb_chan; |
54d01ffb DG |
2793 | struct lttng_channel *channels; |
2794 | ||
b551a063 DG |
2795 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
2796 | cmd_ctx->session, &channels); | |
54d01ffb | 2797 | if (nb_chan < 0) { |
f73fabfd | 2798 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2799 | ret = -nb_chan; |
2800 | goto error; | |
5461b305 | 2801 | } |
ca95a216 | 2802 | |
54d01ffb | 2803 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2804 | if (ret < 0) { |
2805 | goto setup_error; | |
2806 | } | |
9f19cc17 | 2807 | |
54d01ffb DG |
2808 | /* Copy event list into message payload */ |
2809 | memcpy(cmd_ctx->llm->payload, channels, | |
2810 | nb_chan * sizeof(struct lttng_channel)); | |
2811 | ||
2812 | free(channels); | |
9f19cc17 | 2813 | |
f73fabfd | 2814 | ret = LTTNG_OK; |
5461b305 | 2815 | break; |
5e16da05 | 2816 | } |
9f19cc17 | 2817 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2818 | { |
b551a063 | 2819 | ssize_t nb_event; |
684d34d2 | 2820 | struct lttng_event *events = NULL; |
9f19cc17 | 2821 | |
b551a063 | 2822 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
2823 | cmd_ctx->lsm->u.list.channel_name, &events); |
2824 | if (nb_event < 0) { | |
f73fabfd | 2825 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2826 | ret = -nb_event; |
2827 | goto error; | |
5461b305 | 2828 | } |
ca95a216 | 2829 | |
54d01ffb | 2830 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2831 | if (ret < 0) { |
2832 | goto setup_error; | |
2833 | } | |
9f19cc17 | 2834 | |
54d01ffb DG |
2835 | /* Copy event list into message payload */ |
2836 | memcpy(cmd_ctx->llm->payload, events, | |
2837 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2838 | |
54d01ffb | 2839 | free(events); |
9f19cc17 | 2840 | |
f73fabfd | 2841 | ret = LTTNG_OK; |
5461b305 | 2842 | break; |
5e16da05 MD |
2843 | } |
2844 | case LTTNG_LIST_SESSIONS: | |
2845 | { | |
8e0af1b4 | 2846 | unsigned int nr_sessions; |
5461b305 | 2847 | |
8e0af1b4 | 2848 | session_lock_list(); |
730389d9 DG |
2849 | nr_sessions = lttng_sessions_count( |
2850 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2851 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 2852 | |
8e0af1b4 | 2853 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 2854 | if (ret < 0) { |
54d01ffb | 2855 | session_unlock_list(); |
5461b305 | 2856 | goto setup_error; |
e065084a | 2857 | } |
5e16da05 | 2858 | |
6c9cc2ab | 2859 | /* Filled the session array */ |
2f77fc4b | 2860 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
2861 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2862 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 2863 | |
54d01ffb | 2864 | session_unlock_list(); |
5e16da05 | 2865 | |
f73fabfd | 2866 | ret = LTTNG_OK; |
5e16da05 MD |
2867 | break; |
2868 | } | |
d0254c7c MD |
2869 | case LTTNG_CALIBRATE: |
2870 | { | |
54d01ffb DG |
2871 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2872 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2873 | break; |
2874 | } | |
d9800920 DG |
2875 | case LTTNG_REGISTER_CONSUMER: |
2876 | { | |
2f77fc4b DG |
2877 | struct consumer_data *cdata; |
2878 | ||
2879 | switch (cmd_ctx->lsm->domain.type) { | |
2880 | case LTTNG_DOMAIN_KERNEL: | |
2881 | cdata = &kconsumer_data; | |
2882 | break; | |
2883 | default: | |
f73fabfd | 2884 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2885 | goto error; |
2886 | } | |
2887 | ||
54d01ffb | 2888 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2889 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
2890 | break; |
2891 | } | |
025faf73 | 2892 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
2893 | { |
2894 | struct lttng_filter_bytecode *bytecode; | |
2895 | ||
025faf73 | 2896 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 2897 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2898 | goto error; |
2899 | } | |
52df2401 MD |
2900 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
2901 | ret = LTTNG_ERR_FILTER_INVAL; | |
2902 | goto error; | |
2903 | } | |
025faf73 | 2904 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 2905 | if (!bytecode) { |
f73fabfd | 2906 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
2907 | goto error; |
2908 | } | |
2909 | /* Receive var. len. data */ | |
2910 | DBG("Receiving var len data from client ..."); | |
2911 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 2912 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
2913 | if (ret <= 0) { |
2914 | DBG("Nothing recv() from client var len data... continuing"); | |
2915 | *sock_error = 1; | |
f73fabfd | 2916 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2917 | goto error; |
2918 | } | |
2919 | ||
2920 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 2921 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 2922 | free(bytecode); |
f73fabfd | 2923 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2924 | goto error; |
2925 | } | |
2926 | ||
025faf73 DG |
2927 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2928 | cmd_ctx->lsm->u.enable.channel_name, | |
2929 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
2930 | break; |
2931 | } | |
6d805429 | 2932 | case LTTNG_DATA_PENDING: |
806e2684 | 2933 | { |
6d805429 | 2934 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
2935 | break; |
2936 | } | |
5e16da05 | 2937 | default: |
f73fabfd | 2938 | ret = LTTNG_ERR_UND; |
5461b305 | 2939 | break; |
fac6795d DG |
2940 | } |
2941 | ||
5461b305 | 2942 | error: |
5461b305 DG |
2943 | if (cmd_ctx->llm == NULL) { |
2944 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2945 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2946 | goto setup_error; |
2947 | } | |
2948 | } | |
54d01ffb | 2949 | /* Set return code */ |
5461b305 | 2950 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 2951 | setup_error: |
b5541356 | 2952 | if (cmd_ctx->session) { |
54d01ffb | 2953 | session_unlock(cmd_ctx->session); |
b5541356 | 2954 | } |
256a5576 MD |
2955 | if (need_tracing_session) { |
2956 | session_unlock_list(); | |
2957 | } | |
54d01ffb | 2958 | init_setup_error: |
8028d920 | 2959 | return ret; |
fac6795d DG |
2960 | } |
2961 | ||
44a5e5eb DG |
2962 | /* |
2963 | * Thread managing health check socket. | |
2964 | */ | |
2965 | static void *thread_manage_health(void *data) | |
2966 | { | |
eb4a2943 | 2967 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
2968 | uint32_t revents, nb_fd; |
2969 | struct lttng_poll_event events; | |
2970 | struct lttcomm_health_msg msg; | |
2971 | struct lttcomm_health_data reply; | |
2972 | ||
2973 | DBG("[thread] Manage health check started"); | |
2974 | ||
2975 | rcu_register_thread(); | |
2976 | ||
2977 | /* Create unix socket */ | |
2978 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
2979 | if (sock < 0) { | |
2980 | ERR("Unable to create health check Unix socket"); | |
2981 | ret = -1; | |
2982 | goto error; | |
2983 | } | |
2984 | ||
b662582b DG |
2985 | /* |
2986 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2987 | * show must go on. | |
2988 | */ | |
2989 | (void) utils_set_fd_cloexec(sock); | |
2990 | ||
44a5e5eb DG |
2991 | ret = lttcomm_listen_unix_sock(sock); |
2992 | if (ret < 0) { | |
2993 | goto error; | |
2994 | } | |
2995 | ||
2996 | /* | |
2997 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2998 | * more will be added to this poll set. | |
2999 | */ | |
3000 | ret = create_thread_poll_set(&events, 2); | |
3001 | if (ret < 0) { | |
3002 | goto error; | |
3003 | } | |
3004 | ||
3005 | /* Add the application registration socket */ | |
3006 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3007 | if (ret < 0) { | |
3008 | goto error; | |
3009 | } | |
3010 | ||
3011 | while (1) { | |
3012 | DBG("Health check ready"); | |
3013 | ||
44a5e5eb DG |
3014 | /* Inifinite blocking call, waiting for transmission */ |
3015 | restart: | |
3016 | ret = lttng_poll_wait(&events, -1); | |
3017 | if (ret < 0) { | |
3018 | /* | |
3019 | * Restart interrupted system call. | |
3020 | */ | |
3021 | if (errno == EINTR) { | |
3022 | goto restart; | |
3023 | } | |
3024 | goto error; | |
3025 | } | |
3026 | ||
0d9c5d77 DG |
3027 | nb_fd = ret; |
3028 | ||
44a5e5eb DG |
3029 | for (i = 0; i < nb_fd; i++) { |
3030 | /* Fetch once the poll data */ | |
3031 | revents = LTTNG_POLL_GETEV(&events, i); | |
3032 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3033 | ||
3034 | /* Thread quit pipe has been closed. Killing thread. */ | |
3035 | ret = check_thread_quit_pipe(pollfd, revents); | |
3036 | if (ret) { | |
139ac872 MD |
3037 | err = 0; |
3038 | goto exit; | |
44a5e5eb DG |
3039 | } |
3040 | ||
3041 | /* Event on the registration socket */ | |
3042 | if (pollfd == sock) { | |
3043 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3044 | ERR("Health socket poll error"); | |
3045 | goto error; | |
3046 | } | |
3047 | } | |
3048 | } | |
3049 | ||
3050 | new_sock = lttcomm_accept_unix_sock(sock); | |
3051 | if (new_sock < 0) { | |
3052 | goto error; | |
3053 | } | |
3054 | ||
b662582b DG |
3055 | /* |
3056 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3057 | * show must go on. | |
3058 | */ | |
3059 | (void) utils_set_fd_cloexec(new_sock); | |
3060 | ||
44a5e5eb DG |
3061 | DBG("Receiving data from client for health..."); |
3062 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3063 | if (ret <= 0) { | |
3064 | DBG("Nothing recv() from client... continuing"); | |
3065 | ret = close(new_sock); | |
3066 | if (ret) { | |
3067 | PERROR("close"); | |
3068 | } | |
3069 | new_sock = -1; | |
3070 | continue; | |
3071 | } | |
3072 | ||
3073 | rcu_thread_online(); | |
3074 | ||
3075 | switch (msg.component) { | |
3076 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3077 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3078 | break; |
139ac872 | 3079 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3080 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3081 | break; |
44a5e5eb | 3082 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3083 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3084 | break; |
3085 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3086 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3087 | break; |
3088 | case LTTNG_HEALTH_CONSUMER: | |
3089 | reply.ret_code = check_consumer_health(); | |
3090 | break; | |
3091 | case LTTNG_HEALTH_ALL: | |
44a5e5eb | 3092 | reply.ret_code = |
927ca06a DG |
3093 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3094 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3095 | health_check_state(HEALTH_TYPE_CMD) && | |
3096 | health_check_state(HEALTH_TYPE_KERNEL) && | |
139ac872 | 3097 | check_consumer_health(); |
44a5e5eb DG |
3098 | break; |
3099 | default: | |
f73fabfd | 3100 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3101 | break; |
3102 | } | |
3103 | ||
3104 | /* | |
3105 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3106 | * the client where in the sessiond it is the opposite. Again, this is | |
3107 | * just to make things easier for us poor developer which enjoy a lot | |
3108 | * lazyness. | |
3109 | */ | |
3110 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3111 | reply.ret_code = !reply.ret_code; | |
3112 | } | |
3113 | ||
3114 | DBG2("Health check return value %d", reply.ret_code); | |
3115 | ||
3116 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3117 | if (ret < 0) { | |
3118 | ERR("Failed to send health data back to client"); | |
3119 | } | |
3120 | ||
3121 | /* End of transmission */ | |
3122 | ret = close(new_sock); | |
3123 | if (ret) { | |
3124 | PERROR("close"); | |
3125 | } | |
3126 | new_sock = -1; | |
3127 | } | |
3128 | ||
139ac872 | 3129 | exit: |
44a5e5eb | 3130 | error: |
139ac872 MD |
3131 | if (err) { |
3132 | ERR("Health error occurred in %s", __func__); | |
3133 | } | |
44a5e5eb DG |
3134 | DBG("Health check thread dying"); |
3135 | unlink(health_unix_sock_path); | |
3136 | if (sock >= 0) { | |
3137 | ret = close(sock); | |
3138 | if (ret) { | |
3139 | PERROR("close"); | |
3140 | } | |
3141 | } | |
3142 | if (new_sock >= 0) { | |
3143 | ret = close(new_sock); | |
3144 | if (ret) { | |
3145 | PERROR("close"); | |
3146 | } | |
3147 | } | |
3148 | ||
3149 | lttng_poll_clean(&events); | |
3150 | ||
3151 | rcu_unregister_thread(); | |
3152 | return NULL; | |
3153 | } | |
3154 | ||
1d4b027a | 3155 | /* |
d063d709 DG |
3156 | * This thread manage all clients request using the unix client socket for |
3157 | * communication. | |
1d4b027a DG |
3158 | */ |
3159 | static void *thread_manage_clients(void *data) | |
3160 | { | |
139ac872 | 3161 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3162 | int sock_error; |
5eb91c98 | 3163 | uint32_t revents, nb_fd; |
273ea72c | 3164 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3165 | struct lttng_poll_event events; |
1d4b027a DG |
3166 | |
3167 | DBG("[thread] Manage client started"); | |
3168 | ||
f6a9efaa DG |
3169 | rcu_register_thread(); |
3170 | ||
927ca06a DG |
3171 | health_register(HEALTH_TYPE_CMD); |
3172 | ||
6993eeb3 CB |
3173 | if (testpoint(thread_manage_clients)) { |
3174 | goto error_testpoint; | |
3175 | } | |
3176 | ||
44a5e5eb DG |
3177 | health_code_update(&health_thread_cmd); |
3178 | ||
1d4b027a DG |
3179 | ret = lttcomm_listen_unix_sock(client_sock); |
3180 | if (ret < 0) { | |
35df2755 | 3181 | goto error_listen; |
1d4b027a DG |
3182 | } |
3183 | ||
5eb91c98 DG |
3184 | /* |
3185 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3186 | * more will be added to this poll set. | |
3187 | */ | |
3188 | ret = create_thread_poll_set(&events, 2); | |
3189 | if (ret < 0) { | |
35df2755 | 3190 | goto error_create_poll; |
5eb91c98 | 3191 | } |
273ea72c | 3192 | |
5eb91c98 DG |
3193 | /* Add the application registration socket */ |
3194 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3195 | if (ret < 0) { | |
3196 | goto error; | |
3197 | } | |
273ea72c | 3198 | |
bbd973c2 DG |
3199 | /* |
3200 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3201 | */ |
3202 | if (opt_sig_parent) { | |
8db8d1dc | 3203 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3204 | } |
3205 | ||
6993eeb3 CB |
3206 | if (testpoint(thread_manage_clients_before_loop)) { |
3207 | goto error; | |
3208 | } | |
8ac94142 | 3209 | |
44a5e5eb DG |
3210 | health_code_update(&health_thread_cmd); |
3211 | ||
1d4b027a | 3212 | while (1) { |
1d4b027a | 3213 | DBG("Accepting client command ..."); |
273ea72c DG |
3214 | |
3215 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3216 | restart: |
44a5e5eb | 3217 | health_poll_update(&health_thread_cmd); |
5eb91c98 | 3218 | ret = lttng_poll_wait(&events, -1); |
44a5e5eb | 3219 | health_poll_update(&health_thread_cmd); |
273ea72c | 3220 | if (ret < 0) { |
88f2b785 MD |
3221 | /* |
3222 | * Restart interrupted system call. | |
3223 | */ | |
3224 | if (errno == EINTR) { | |
3225 | goto restart; | |
3226 | } | |
273ea72c DG |
3227 | goto error; |
3228 | } | |
3229 | ||
0d9c5d77 DG |
3230 | nb_fd = ret; |
3231 | ||
5eb91c98 DG |
3232 | for (i = 0; i < nb_fd; i++) { |
3233 | /* Fetch once the poll data */ | |
3234 | revents = LTTNG_POLL_GETEV(&events, i); | |
3235 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3236 | ||
44a5e5eb DG |
3237 | health_code_update(&health_thread_cmd); |
3238 | ||
5eb91c98 DG |
3239 | /* Thread quit pipe has been closed. Killing thread. */ |
3240 | ret = check_thread_quit_pipe(pollfd, revents); | |
3241 | if (ret) { | |
139ac872 MD |
3242 | err = 0; |
3243 | goto exit; | |
5eb91c98 DG |
3244 | } |
3245 | ||
3246 | /* Event on the registration socket */ | |
3247 | if (pollfd == client_sock) { | |
3248 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3249 | ERR("Client socket poll error"); | |
3250 | goto error; | |
3251 | } | |
3252 | } | |
3253 | } | |
3254 | ||
3255 | DBG("Wait for client response"); | |
3256 | ||
44a5e5eb DG |
3257 | health_code_update(&health_thread_cmd); |
3258 | ||
5eb91c98 DG |
3259 | sock = lttcomm_accept_unix_sock(client_sock); |
3260 | if (sock < 0) { | |
273ea72c | 3261 | goto error; |
273ea72c DG |
3262 | } |
3263 | ||
b662582b DG |
3264 | /* |
3265 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3266 | * show must go on. | |
3267 | */ | |
3268 | (void) utils_set_fd_cloexec(sock); | |
3269 | ||
be040666 DG |
3270 | /* Set socket option for credentials retrieval */ |
3271 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3272 | if (ret < 0) { | |
3273 | goto error; | |
3274 | } | |
3275 | ||
5eb91c98 | 3276 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3277 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3278 | if (cmd_ctx == NULL) { |
76d7553f | 3279 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3280 | goto error; |
5eb91c98 | 3281 | } |
1d4b027a | 3282 | |
5eb91c98 | 3283 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3284 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3285 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3286 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3287 | goto error; |
3288 | } | |
1d4b027a | 3289 | |
5eb91c98 DG |
3290 | cmd_ctx->llm = NULL; |
3291 | cmd_ctx->session = NULL; | |
1d4b027a | 3292 | |
44a5e5eb DG |
3293 | health_code_update(&health_thread_cmd); |
3294 | ||
5eb91c98 DG |
3295 | /* |
3296 | * Data is received from the lttng client. The struct | |
3297 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3298 | * the client. | |
3299 | */ | |
3300 | DBG("Receiving data from client ..."); | |
be040666 DG |
3301 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3302 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3303 | if (ret <= 0) { |
3304 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3305 | ret = close(sock); |
3306 | if (ret) { | |
3307 | PERROR("close"); | |
3308 | } | |
3309 | sock = -1; | |
a2c0da86 | 3310 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3311 | continue; |
3312 | } | |
1d4b027a | 3313 | |
44a5e5eb DG |
3314 | health_code_update(&health_thread_cmd); |
3315 | ||
5eb91c98 DG |
3316 | // TODO: Validate cmd_ctx including sanity check for |
3317 | // security purpose. | |
f7776ea7 | 3318 | |
f6a9efaa | 3319 | rcu_thread_online(); |
5eb91c98 DG |
3320 | /* |
3321 | * This function dispatch the work to the kernel or userspace tracer | |
3322 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3323 | * informations for the client. The command context struct contains | |
3324 | * everything this function may needs. | |
3325 | */ | |
53a80697 | 3326 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3327 | rcu_thread_offline(); |
5eb91c98 | 3328 | if (ret < 0) { |
53a80697 MD |
3329 | if (sock_error) { |
3330 | ret = close(sock); | |
3331 | if (ret) { | |
3332 | PERROR("close"); | |
3333 | } | |
3334 | sock = -1; | |
3335 | } | |
bbd973c2 | 3336 | /* |
5eb91c98 | 3337 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3338 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3339 | * (ENOMEM). Error detected but still accept |
3340 | * command, unless a socket error has been | |
3341 | * detected. | |
bbd973c2 | 3342 | */ |
bbd973c2 | 3343 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3344 | continue; |
3345 | } | |
d6e4fca4 | 3346 | |
44a5e5eb DG |
3347 | health_code_update(&health_thread_cmd); |
3348 | ||
54d01ffb DG |
3349 | DBG("Sending response (size: %d, retcode: %s)", |
3350 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3351 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3352 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3353 | if (ret < 0) { |
3354 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3355 | } |
1d4b027a | 3356 | |
5eb91c98 | 3357 | /* End of transmission */ |
76d7553f MD |
3358 | ret = close(sock); |
3359 | if (ret) { | |
3360 | PERROR("close"); | |
3361 | } | |
3362 | sock = -1; | |
be040666 DG |
3363 | |
3364 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb DG |
3365 | |
3366 | health_code_update(&health_thread_cmd); | |
273ea72c DG |
3367 | } |
3368 | ||
139ac872 | 3369 | exit: |
5eb91c98 | 3370 | error: |
35df2755 CB |
3371 | if (sock >= 0) { |
3372 | ret = close(sock); | |
3373 | if (ret) { | |
3374 | PERROR("close"); | |
3375 | } | |
139ac872 | 3376 | } |
44a5e5eb | 3377 | |
35df2755 CB |
3378 | lttng_poll_clean(&events); |
3379 | clean_command_ctx(&cmd_ctx); | |
3380 | ||
3381 | error_listen: | |
3382 | error_create_poll: | |
6993eeb3 | 3383 | error_testpoint: |
273ea72c | 3384 | unlink(client_unix_sock_path); |
76d7553f MD |
3385 | if (client_sock >= 0) { |
3386 | ret = close(client_sock); | |
3387 | if (ret) { | |
3388 | PERROR("close"); | |
3389 | } | |
a4b35e07 | 3390 | } |
35df2755 CB |
3391 | |
3392 | if (err) { | |
3393 | health_error(&health_thread_cmd); | |
3394 | ERR("Health error occurred in %s", __func__); | |
a4b35e07 | 3395 | } |
273ea72c | 3396 | |
927ca06a | 3397 | health_unregister(); |
35df2755 CB |
3398 | |
3399 | DBG("Client thread dying"); | |
f6a9efaa DG |
3400 | |
3401 | rcu_unregister_thread(); | |
1d4b027a DG |
3402 | return NULL; |
3403 | } | |
3404 | ||
3405 | ||
fac6795d DG |
3406 | /* |
3407 | * usage function on stderr | |
3408 | */ | |
3409 | static void usage(void) | |
3410 | { | |
b716ce68 | 3411 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3412 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3413 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3414 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3415 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3416 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3417 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3418 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3419 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3420 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3421 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3422 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3423 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3424 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3425 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3426 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3427 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3428 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3429 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3430 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3431 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3432 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3433 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3434 | } |
3435 | ||
3436 | /* | |
3437 | * daemon argument parsing | |
3438 | */ | |
3439 | static int parse_args(int argc, char **argv) | |
3440 | { | |
3441 | int c; | |
3442 | ||
3443 | static struct option long_options[] = { | |
3444 | { "client-sock", 1, 0, 'c' }, | |
3445 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3446 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3447 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3448 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3449 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3450 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3451 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3452 | { "consumerd32-path", 1, 0, 'u' }, | |
3453 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3454 | { "consumerd64-path", 1, 0, 't' }, | |
3455 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3456 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3457 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3458 | { "help", 0, 0, 'h' }, |
3459 | { "group", 1, 0, 'g' }, | |
3460 | { "version", 0, 0, 'V' }, | |
75462a81 | 3461 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3462 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3463 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3464 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3465 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3466 | { NULL, 0, 0, 0 } |
3467 | }; | |
3468 | ||
3469 | while (1) { | |
3470 | int option_index = 0; | |
35f90c40 | 3471 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3472 | long_options, &option_index); |
fac6795d DG |
3473 | if (c == -1) { |
3474 | break; | |
3475 | } | |
3476 | ||
3477 | switch (c) { | |
3478 | case 0: | |
3479 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3480 | if (optarg) { | |
3481 | fprintf(stderr, " with arg %s\n", optarg); | |
3482 | } | |
3483 | break; | |
b716ce68 | 3484 | case 'c': |
fac6795d DG |
3485 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3486 | break; | |
3487 | case 'a': | |
3488 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3489 | break; | |
3490 | case 'd': | |
3491 | opt_daemon = 1; | |
3492 | break; | |
3493 | case 'g': | |
fb09408a | 3494 | opt_tracing_group = optarg; |
fac6795d DG |
3495 | break; |
3496 | case 'h': | |
3497 | usage(); | |
3498 | exit(EXIT_FAILURE); | |
3499 | case 'V': | |
3500 | fprintf(stdout, "%s\n", VERSION); | |
3501 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3502 | case 'S': |
3503 | opt_sig_parent = 1; | |
3504 | break; | |
d6f42150 | 3505 | case 'E': |
3bd1e081 | 3506 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3507 | break; |
3508 | case 'C': | |
3bd1e081 MD |
3509 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3510 | break; | |
3511 | case 'F': | |
7753dea8 | 3512 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3513 | break; |
3514 | case 'D': | |
7753dea8 MD |
3515 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3516 | break; | |
3517 | case 'H': | |
3518 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3519 | break; | |
3520 | case 'G': | |
3521 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3522 | break; |
4fba7219 DG |
3523 | case 'N': |
3524 | opt_no_kernel = 1; | |
3525 | break; | |
75462a81 | 3526 | case 'q': |
97e19046 | 3527 | lttng_opt_quiet = 1; |
75462a81 | 3528 | break; |
3f9947db | 3529 | case 'v': |
53086306 | 3530 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3531 | lttng_opt_verbose += 1; |
3f9947db | 3532 | break; |
31f73cc9 | 3533 | case 'Z': |
3bd1e081 | 3534 | opt_verbose_consumer += 1; |
31f73cc9 | 3535 | break; |
fb09408a | 3536 | case 'u': |
fc7a59ce | 3537 | consumerd32_bin= optarg; |
ebaeda94 MD |
3538 | break; |
3539 | case 'U': | |
3540 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3541 | break; |
3542 | case 't': | |
fc7a59ce | 3543 | consumerd64_bin = optarg; |
ebaeda94 MD |
3544 | break; |
3545 | case 'T': | |
3546 | consumerd64_libdir = optarg; | |
fb09408a | 3547 | break; |
35f90c40 DG |
3548 | case 'p': |
3549 | opt_pidfile = optarg; | |
3550 | break; | |
fac6795d DG |
3551 | default: |
3552 | /* Unknown option or other error. | |
3553 | * Error is printed by getopt, just return */ | |
3554 | return -1; | |
3555 | } | |
3556 | } | |
3557 | ||
3558 | return 0; | |
3559 | } | |
3560 | ||
3561 | /* | |
d063d709 | 3562 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3563 | * apps_sock - The communication socket for all UST apps. |
3564 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3565 | */ |
cf3af59e | 3566 | static int init_daemon_socket(void) |
fac6795d DG |
3567 | { |
3568 | int ret = 0; | |
3569 | mode_t old_umask; | |
3570 | ||
3571 | old_umask = umask(0); | |
3572 | ||
3573 | /* Create client tool unix socket */ | |
d6f42150 DG |
3574 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3575 | if (client_sock < 0) { | |
3576 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3577 | ret = -1; |
3578 | goto end; | |
3579 | } | |
3580 | ||
b662582b DG |
3581 | /* Set the cloexec flag */ |
3582 | ret = utils_set_fd_cloexec(client_sock); | |
3583 | if (ret < 0) { | |
3584 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3585 | "Continuing but note that the consumer daemon will have a " | |
3586 | "reference to this socket on exec()", client_sock); | |
3587 | } | |
3588 | ||
fac6795d DG |
3589 | /* File permission MUST be 660 */ |
3590 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3591 | if (ret < 0) { | |
d6f42150 | 3592 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 3593 | PERROR("chmod"); |
fac6795d DG |
3594 | goto end; |
3595 | } | |
3596 | ||
3597 | /* Create the application unix socket */ | |
d6f42150 DG |
3598 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3599 | if (apps_sock < 0) { | |
3600 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3601 | ret = -1; |
3602 | goto end; | |
3603 | } | |
3604 | ||
b662582b DG |
3605 | /* Set the cloexec flag */ |
3606 | ret = utils_set_fd_cloexec(apps_sock); | |
3607 | if (ret < 0) { | |
3608 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
3609 | "Continuing but note that the consumer daemon will have a " | |
3610 | "reference to this socket on exec()", apps_sock); | |
3611 | } | |
3612 | ||
d6f42150 | 3613 | /* File permission MUST be 666 */ |
54d01ffb DG |
3614 | ret = chmod(apps_unix_sock_path, |
3615 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3616 | if (ret < 0) { |
d6f42150 | 3617 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 3618 | PERROR("chmod"); |
fac6795d DG |
3619 | goto end; |
3620 | } | |
3621 | ||
b662582b DG |
3622 | DBG3("Session daemon client socket %d and application socket %d created", |
3623 | client_sock, apps_sock); | |
3624 | ||
fac6795d DG |
3625 | end: |
3626 | umask(old_umask); | |
3627 | return ret; | |
3628 | } | |
3629 | ||
3630 | /* | |
54d01ffb DG |
3631 | * Check if the global socket is available, and if a daemon is answering at the |
3632 | * other side. If yes, error is returned. | |
fac6795d | 3633 | */ |
cf3af59e | 3634 | static int check_existing_daemon(void) |
fac6795d | 3635 | { |
7d8234d9 | 3636 | /* Is there anybody out there ? */ |
099e26bd | 3637 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3638 | return -EEXIST; |
099e26bd | 3639 | } |
b09c7c76 DG |
3640 | |
3641 | return 0; | |
fac6795d DG |
3642 | } |
3643 | ||
fac6795d | 3644 | /* |
d063d709 | 3645 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3646 | * |
d063d709 | 3647 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3648 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3649 | */ |
be040666 | 3650 | static int set_permissions(char *rundir) |
fac6795d DG |
3651 | { |
3652 | int ret; | |
996b65c8 | 3653 | gid_t gid; |
fac6795d | 3654 | |
6775595e DG |
3655 | ret = allowed_group(); |
3656 | if (ret < 0) { | |
be040666 DG |
3657 | WARN("No tracing group detected"); |
3658 | ret = 0; | |
fac6795d DG |
3659 | goto end; |
3660 | } | |
3661 | ||
6775595e DG |
3662 | gid = ret; |
3663 | ||
d6f42150 | 3664 | /* Set lttng run dir */ |
be040666 | 3665 | ret = chown(rundir, 0, gid); |
d6f42150 | 3666 | if (ret < 0) { |
be040666 | 3667 | ERR("Unable to set group on %s", rundir); |
76d7553f | 3668 | PERROR("chown"); |
d6f42150 DG |
3669 | } |
3670 | ||
d1613cf5 | 3671 | /* Ensure tracing group can search the run dir */ |
61076f74 | 3672 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
3673 | if (ret < 0) { |
3674 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 3675 | PERROR("chmod"); |
d1613cf5 JN |
3676 | } |
3677 | ||
d6f42150 | 3678 | /* lttng client socket path */ |
996b65c8 | 3679 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3680 | if (ret < 0) { |
d6f42150 | 3681 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 3682 | PERROR("chown"); |
d6f42150 DG |
3683 | } |
3684 | ||
3bd1e081 MD |
3685 | /* kconsumer error socket path */ |
3686 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3687 | if (ret < 0) { |
3bd1e081 | 3688 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 3689 | PERROR("chown"); |
3bd1e081 MD |
3690 | } |
3691 | ||
7753dea8 MD |
3692 | /* 64-bit ustconsumer error socket path */ |
3693 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3694 | if (ret < 0) { | |
3695 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 3696 | PERROR("chown"); |
7753dea8 MD |
3697 | } |
3698 | ||
3699 | /* 32-bit ustconsumer compat32 error socket path */ | |
3700 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3701 | if (ret < 0) { |
7753dea8 | 3702 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 3703 | PERROR("chown"); |
fac6795d DG |
3704 | } |
3705 | ||
d6f42150 | 3706 | DBG("All permissions are set"); |
e07ae692 | 3707 | |
fac6795d DG |
3708 | end: |
3709 | return ret; | |
3710 | } | |
3711 | ||
d6f42150 | 3712 | /* |
d063d709 | 3713 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 3714 | */ |
67e40797 | 3715 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
3716 | { |
3717 | int ret; | |
3718 | ||
67e40797 DG |
3719 | DBG3("Creating LTTng run directory: %s", rundir); |
3720 | ||
d1613cf5 | 3721 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 3722 | if (ret < 0) { |
b1f11e69 | 3723 | if (errno != EEXIST) { |
67e40797 | 3724 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
3725 | goto error; |
3726 | } else { | |
3727 | ret = 0; | |
3728 | } | |
d6f42150 DG |
3729 | } |
3730 | ||
3731 | error: | |
3732 | return ret; | |
3733 | } | |
3734 | ||
3735 | /* | |
d063d709 DG |
3736 | * Setup sockets and directory needed by the kconsumerd communication with the |
3737 | * session daemon. | |
d6f42150 | 3738 | */ |
67e40797 DG |
3739 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
3740 | const char *rundir) | |
d6f42150 DG |
3741 | { |
3742 | int ret; | |
67e40797 | 3743 | char path[PATH_MAX]; |
d6f42150 | 3744 | |
67e40797 | 3745 | switch (consumer_data->type) { |
7753dea8 | 3746 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 3747 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
3748 | break; |
3749 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 3750 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
3751 | break; |
3752 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 3753 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
3754 | break; |
3755 | default: | |
3756 | ERR("Consumer type unknown"); | |
3757 | ret = -EINVAL; | |
3758 | goto error; | |
d6f42150 DG |
3759 | } |
3760 | ||
67e40797 DG |
3761 | DBG2("Creating consumer directory: %s", path); |
3762 | ||
d1613cf5 | 3763 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 3764 | if (ret < 0) { |
6beb2242 | 3765 | if (errno != EEXIST) { |
f11e84c2 | 3766 | PERROR("mkdir"); |
3bd1e081 | 3767 | ERR("Failed to create %s", path); |
6beb2242 DG |
3768 | goto error; |
3769 | } | |
f11e84c2 | 3770 | ret = -1; |
d6f42150 DG |
3771 | } |
3772 | ||
3773 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3774 | consumer_data->err_sock = |
3775 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3776 | if (consumer_data->err_sock < 0) { | |
3777 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3778 | ret = -1; |
3779 | goto error; | |
3780 | } | |
3781 | ||
3782 | /* File permission MUST be 660 */ | |
3bd1e081 | 3783 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3784 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3785 | if (ret < 0) { |
3bd1e081 | 3786 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 3787 | PERROR("chmod"); |
d6f42150 DG |
3788 | goto error; |
3789 | } | |
3790 | ||
3791 | error: | |
3792 | return ret; | |
3793 | } | |
3794 | ||
fac6795d | 3795 | /* |
d063d709 | 3796 | * Signal handler for the daemon |
cf3af59e | 3797 | * |
54d01ffb DG |
3798 | * Simply stop all worker threads, leaving main() return gracefully after |
3799 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3800 | */ |
3801 | static void sighandler(int sig) | |
3802 | { | |
3803 | switch (sig) { | |
cf3af59e | 3804 | case SIGPIPE: |
af87c45a | 3805 | DBG("SIGPIPE caught"); |
cf3af59e MD |
3806 | return; |
3807 | case SIGINT: | |
af87c45a | 3808 | DBG("SIGINT caught"); |
cf3af59e MD |
3809 | stop_threads(); |
3810 | break; | |
3811 | case SIGTERM: | |
af87c45a | 3812 | DBG("SIGTERM caught"); |
cf3af59e MD |
3813 | stop_threads(); |
3814 | break; | |
3815 | default: | |
3816 | break; | |
fac6795d | 3817 | } |
fac6795d DG |
3818 | } |
3819 | ||
3820 | /* | |
d063d709 | 3821 | * Setup signal handler for : |
1d4b027a | 3822 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3823 | */ |
1d4b027a | 3824 | static int set_signal_handler(void) |
fac6795d | 3825 | { |
1d4b027a DG |
3826 | int ret = 0; |
3827 | struct sigaction sa; | |
3828 | sigset_t sigset; | |
fac6795d | 3829 | |
1d4b027a | 3830 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 3831 | PERROR("sigemptyset"); |
1d4b027a DG |
3832 | return ret; |
3833 | } | |
d6f42150 | 3834 | |
1d4b027a DG |
3835 | sa.sa_handler = sighandler; |
3836 | sa.sa_mask = sigset; | |
3837 | sa.sa_flags = 0; | |
3838 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 3839 | PERROR("sigaction"); |
1d4b027a | 3840 | return ret; |
d6f42150 DG |
3841 | } |
3842 | ||
1d4b027a | 3843 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 3844 | PERROR("sigaction"); |
1d4b027a | 3845 | return ret; |
d6f42150 | 3846 | } |
aaf26714 | 3847 | |
1d4b027a | 3848 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 3849 | PERROR("sigaction"); |
1d4b027a | 3850 | return ret; |
8c0faa1d DG |
3851 | } |
3852 | ||
1d4b027a DG |
3853 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3854 | ||
3855 | return ret; | |
fac6795d DG |
3856 | } |
3857 | ||
f3ed775e | 3858 | /* |
d063d709 DG |
3859 | * Set open files limit to unlimited. This daemon can open a large number of |
3860 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3861 | */ |
3862 | static void set_ulimit(void) | |
3863 | { | |
3864 | int ret; | |
3865 | struct rlimit lim; | |
3866 | ||
a88df331 | 3867 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3868 | lim.rlim_cur = 65535; |
3869 | lim.rlim_max = 65535; | |
3870 | ||
3871 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3872 | if (ret < 0) { | |
76d7553f | 3873 | PERROR("failed to set open files limit"); |
f3ed775e DG |
3874 | } |
3875 | } | |
3876 | ||
35f90c40 DG |
3877 | /* |
3878 | * Write pidfile using the rundir and opt_pidfile. | |
3879 | */ | |
3880 | static void write_pidfile(void) | |
3881 | { | |
3882 | int ret; | |
3883 | char pidfile_path[PATH_MAX]; | |
3884 | ||
3885 | assert(rundir); | |
3886 | ||
3887 | if (opt_pidfile) { | |
3888 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
3889 | } else { | |
3890 | /* Build pidfile path from rundir and opt_pidfile. */ | |
3891 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
3892 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
3893 | if (ret < 0) { | |
3894 | PERROR("snprintf pidfile path"); | |
3895 | goto error; | |
3896 | } | |
3897 | } | |
3898 | ||
3899 | /* | |
3900 | * Create pid file in rundir. Return value is of no importance. The | |
3901 | * execution will continue even though we are not able to write the file. | |
3902 | */ | |
3903 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
3904 | ||
3905 | error: | |
3906 | return; | |
3907 | } | |
3908 | ||
fac6795d DG |
3909 | /* |
3910 | * main | |
3911 | */ | |
3912 | int main(int argc, char **argv) | |
3913 | { | |
fac6795d DG |
3914 | int ret = 0; |
3915 | void *status; | |
ae9e45b3 | 3916 | const char *home_path, *env_app_timeout; |
fac6795d | 3917 | |
335a95b7 MD |
3918 | init_kernel_workarounds(); |
3919 | ||
f6a9efaa DG |
3920 | rcu_register_thread(); |
3921 | ||
7753dea8 | 3922 | setup_consumerd_path(); |
fb09408a | 3923 | |
fac6795d DG |
3924 | /* Parse arguments */ |
3925 | progname = argv[0]; | |
c617c0c6 | 3926 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 3927 | goto error; |
fac6795d DG |
3928 | } |
3929 | ||
3930 | /* Daemonize */ | |
3931 | if (opt_daemon) { | |
ceed52b5 MD |
3932 | int i; |
3933 | ||
3934 | /* | |
3935 | * fork | |
3936 | * child: setsid, close FD 0, 1, 2, chdir / | |
3937 | * parent: exit (if fork is successful) | |
3938 | */ | |
53094c05 DG |
3939 | ret = daemon(0, 0); |
3940 | if (ret < 0) { | |
76d7553f | 3941 | PERROR("daemon"); |
cf3af59e | 3942 | goto error; |
53094c05 | 3943 | } |
ceed52b5 MD |
3944 | /* |
3945 | * We are in the child. Make sure all other file | |
3946 | * descriptors are closed, in case we are called with | |
3947 | * more opened file descriptors than the standard ones. | |
3948 | */ | |
3949 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
3950 | (void) close(i); | |
3951 | } | |
3952 | } | |
3953 | ||
3954 | /* Create thread quit pipe */ | |
3955 | if ((ret = init_thread_quit_pipe()) < 0) { | |
3956 | goto error; | |
fac6795d DG |
3957 | } |
3958 | ||
3959 | /* Check if daemon is UID = 0 */ | |
3960 | is_root = !getuid(); | |
3961 | ||
fac6795d | 3962 | if (is_root) { |
990570ed | 3963 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
3964 | |
3965 | /* Create global run dir with root access */ | |
3966 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 3967 | if (ret < 0) { |
cf3af59e | 3968 | goto error; |
d6f42150 DG |
3969 | } |
3970 | ||
fac6795d | 3971 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3972 | snprintf(apps_unix_sock_path, PATH_MAX, |
3973 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3974 | } |
3975 | ||
3976 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3977 | snprintf(client_unix_sock_path, PATH_MAX, |
3978 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3979 | } | |
0fdd1e2c DG |
3980 | |
3981 | /* Set global SHM for ust */ | |
3982 | if (strlen(wait_shm_path) == 0) { | |
3983 | snprintf(wait_shm_path, PATH_MAX, | |
3984 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
3985 | } | |
67e40797 | 3986 | |
44a5e5eb DG |
3987 | if (strlen(health_unix_sock_path) == 0) { |
3988 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
3989 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
3990 | } | |
3991 | ||
67e40797 DG |
3992 | /* Setup kernel consumerd path */ |
3993 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 3994 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 3995 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 3996 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
3997 | |
3998 | DBG2("Kernel consumer err path: %s", | |
3999 | kconsumer_data.err_unix_sock_path); | |
4000 | DBG2("Kernel consumer cmd path: %s", | |
4001 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4002 | } else { |
b082db07 DG |
4003 | home_path = get_home_dir(); |
4004 | if (home_path == NULL) { | |
273ea72c DG |
4005 | /* TODO: Add --socket PATH option */ |
4006 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4007 | ret = -EPERM; |
4008 | goto error; | |
b082db07 DG |
4009 | } |
4010 | ||
67e40797 DG |
4011 | /* |
4012 | * Create rundir from home path. This will create something like | |
4013 | * $HOME/.lttng | |
4014 | */ | |
990570ed | 4015 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4016 | if (ret < 0) { |
4017 | ret = -ENOMEM; | |
4018 | goto error; | |
4019 | } | |
4020 | ||
4021 | ret = create_lttng_rundir(rundir); | |
4022 | if (ret < 0) { | |
4023 | goto error; | |
4024 | } | |
4025 | ||
fac6795d | 4026 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4027 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4028 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4029 | } |
4030 | ||
4031 | /* Set the cli tool unix socket path */ | |
4032 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4033 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4034 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4035 | } |
0fdd1e2c DG |
4036 | |
4037 | /* Set global SHM for ust */ | |
4038 | if (strlen(wait_shm_path) == 0) { | |
4039 | snprintf(wait_shm_path, PATH_MAX, | |
4040 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4041 | } | |
44a5e5eb DG |
4042 | |
4043 | /* Set health check Unix path */ | |
4044 | if (strlen(health_unix_sock_path) == 0) { | |
4045 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4046 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4047 | } | |
fac6795d DG |
4048 | } |
4049 | ||
5c827ce0 DG |
4050 | /* Set consumer initial state */ |
4051 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4052 | ust_consumerd_state = CONSUMER_STOPPED; | |
4053 | ||
847177cd DG |
4054 | DBG("Client socket path %s", client_unix_sock_path); |
4055 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4056 | DBG("LTTng run directory path: %s", rundir); |
4057 | ||
4058 | /* 32 bits consumerd path setup */ | |
4059 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4060 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4061 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4062 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4063 | |
4064 | DBG2("UST consumer 32 bits err path: %s", | |
4065 | ustconsumer32_data.err_unix_sock_path); | |
4066 | DBG2("UST consumer 32 bits cmd path: %s", | |
4067 | ustconsumer32_data.cmd_unix_sock_path); | |
4068 | ||
4069 | /* 64 bits consumerd path setup */ | |
4070 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4071 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4072 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4073 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4074 | |
4075 | DBG2("UST consumer 64 bits err path: %s", | |
4076 | ustconsumer64_data.err_unix_sock_path); | |
4077 | DBG2("UST consumer 64 bits cmd path: %s", | |
4078 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4079 | |
273ea72c | 4080 | /* |
7d8234d9 | 4081 | * See if daemon already exist. |
fac6795d | 4082 | */ |
7d8234d9 | 4083 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4084 | ERR("Already running daemon.\n"); |
273ea72c | 4085 | /* |
cf3af59e MD |
4086 | * We do not goto exit because we must not cleanup() |
4087 | * because a daemon is already running. | |
ab118b20 | 4088 | */ |
cf3af59e | 4089 | goto error; |
a88df331 DG |
4090 | } |
4091 | ||
1427f9b2 DG |
4092 | /* |
4093 | * Init UST app hash table. Alloc hash table before this point since | |
4094 | * cleanup() can get called after that point. | |
4095 | */ | |
4096 | ust_app_ht_alloc(); | |
4097 | ||
54d01ffb | 4098 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4099 | |
4100 | /* | |
4101 | * These actions must be executed as root. We do that *after* setting up | |
4102 | * the sockets path because we MUST make the check for another daemon using | |
4103 | * those paths *before* trying to set the kernel consumer sockets and init | |
4104 | * kernel tracer. | |
4105 | */ | |
4106 | if (is_root) { | |
67e40797 | 4107 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4108 | if (ret < 0) { |
4109 | goto exit; | |
4110 | } | |
4111 | ||
a88df331 | 4112 | /* Setup kernel tracer */ |
4fba7219 DG |
4113 | if (!opt_no_kernel) { |
4114 | init_kernel_tracer(); | |
4115 | } | |
a88df331 DG |
4116 | |
4117 | /* Set ulimit for open files */ | |
4118 | set_ulimit(); | |
fac6795d | 4119 | } |
4063050c MD |
4120 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4121 | lttng_fd_init(); | |
fac6795d | 4122 | |
67e40797 DG |
4123 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4124 | if (ret < 0) { | |
4125 | goto exit; | |
4126 | } | |
4127 | ||
4128 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4129 | if (ret < 0) { | |
4130 | goto exit; | |
4131 | } | |
4132 | ||
cf3af59e MD |
4133 | if ((ret = set_signal_handler()) < 0) { |
4134 | goto exit; | |
fac6795d DG |
4135 | } |
4136 | ||
d6f42150 | 4137 | /* Setup the needed unix socket */ |
cf3af59e MD |
4138 | if ((ret = init_daemon_socket()) < 0) { |
4139 | goto exit; | |
fac6795d DG |
4140 | } |
4141 | ||
4142 | /* Set credentials to socket */ | |
be040666 | 4143 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4144 | goto exit; |
fac6795d DG |
4145 | } |
4146 | ||
5b8719f5 DG |
4147 | /* Get parent pid if -S, --sig-parent is specified. */ |
4148 | if (opt_sig_parent) { | |
4149 | ppid = getppid(); | |
4150 | } | |
4151 | ||
7a485870 | 4152 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4153 | if (is_root && !opt_no_kernel) { |
4154 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4155 | goto exit; | |
4156 | } | |
7a485870 DG |
4157 | } |
4158 | ||
099e26bd | 4159 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4160 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4161 | goto exit; |
4162 | } | |
4163 | ||
4164 | /* Init UST command queue. */ | |
4165 | cds_wfq_init(&ust_cmd_queue.queue); | |
4166 | ||
273ea72c | 4167 | /* |
54d01ffb DG |
4168 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4169 | * statically declared in session.c | |
273ea72c | 4170 | */ |
54d01ffb | 4171 | session_list_ptr = session_get_list(); |
b5541356 | 4172 | |
5eb91c98 DG |
4173 | /* Set up max poll set size */ |
4174 | lttng_poll_set_max_size(); | |
4175 | ||
2f77fc4b | 4176 | cmd_init(); |
00e2e675 | 4177 | |
ae9e45b3 DG |
4178 | /* Check for the application socket timeout env variable. */ |
4179 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4180 | if (env_app_timeout) { | |
4181 | app_socket_timeout = atoi(env_app_timeout); | |
4182 | } else { | |
4183 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4184 | } | |
4185 | ||
35f90c40 DG |
4186 | write_pidfile(); |
4187 | ||
44a5e5eb DG |
4188 | /* Create thread to manage the client socket */ |
4189 | ret = pthread_create(&health_thread, NULL, | |
4190 | thread_manage_health, (void *) NULL); | |
4191 | if (ret != 0) { | |
4192 | PERROR("pthread_create health"); | |
4193 | goto exit_health; | |
4194 | } | |
4195 | ||
cf3af59e | 4196 | /* Create thread to manage the client socket */ |
099e26bd DG |
4197 | ret = pthread_create(&client_thread, NULL, |
4198 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4199 | if (ret != 0) { |
76d7553f | 4200 | PERROR("pthread_create clients"); |
cf3af59e MD |
4201 | goto exit_client; |
4202 | } | |
fac6795d | 4203 | |
099e26bd DG |
4204 | /* Create thread to dispatch registration */ |
4205 | ret = pthread_create(&dispatch_thread, NULL, | |
4206 | thread_dispatch_ust_registration, (void *) NULL); | |
4207 | if (ret != 0) { | |
76d7553f | 4208 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4209 | goto exit_dispatch; |
4210 | } | |
4211 | ||
4212 | /* Create thread to manage application registration. */ | |
4213 | ret = pthread_create(®_apps_thread, NULL, | |
4214 | thread_registration_apps, (void *) NULL); | |
4215 | if (ret != 0) { | |
76d7553f | 4216 | PERROR("pthread_create registration"); |
099e26bd DG |
4217 | goto exit_reg_apps; |
4218 | } | |
4219 | ||
cf3af59e | 4220 | /* Create thread to manage application socket */ |
54d01ffb DG |
4221 | ret = pthread_create(&apps_thread, NULL, |
4222 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4223 | if (ret != 0) { |
76d7553f | 4224 | PERROR("pthread_create apps"); |
cf3af59e MD |
4225 | goto exit_apps; |
4226 | } | |
fac6795d | 4227 | |
6620da75 DG |
4228 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4229 | if (is_root && !opt_no_kernel) { | |
4230 | /* Create kernel thread to manage kernel event */ | |
4231 | ret = pthread_create(&kernel_thread, NULL, | |
4232 | thread_manage_kernel, (void *) NULL); | |
4233 | if (ret != 0) { | |
4234 | PERROR("pthread_create kernel"); | |
4235 | goto exit_kernel; | |
4236 | } | |
7a485870 | 4237 | |
6620da75 DG |
4238 | ret = pthread_join(kernel_thread, &status); |
4239 | if (ret != 0) { | |
4240 | PERROR("pthread_join"); | |
4241 | goto error; /* join error, exit without cleanup */ | |
4242 | } | |
fac6795d DG |
4243 | } |
4244 | ||
cf3af59e MD |
4245 | exit_kernel: |
4246 | ret = pthread_join(apps_thread, &status); | |
4247 | if (ret != 0) { | |
76d7553f | 4248 | PERROR("pthread_join"); |
cf3af59e MD |
4249 | goto error; /* join error, exit without cleanup */ |
4250 | } | |
fac6795d | 4251 | |
cf3af59e | 4252 | exit_apps: |
099e26bd DG |
4253 | ret = pthread_join(reg_apps_thread, &status); |
4254 | if (ret != 0) { | |
76d7553f | 4255 | PERROR("pthread_join"); |
099e26bd DG |
4256 | goto error; /* join error, exit without cleanup */ |
4257 | } | |
4258 | ||
4259 | exit_reg_apps: | |
4260 | ret = pthread_join(dispatch_thread, &status); | |
4261 | if (ret != 0) { | |
76d7553f | 4262 | PERROR("pthread_join"); |
099e26bd DG |
4263 | goto error; /* join error, exit without cleanup */ |
4264 | } | |
4265 | ||
4266 | exit_dispatch: | |
cf3af59e MD |
4267 | ret = pthread_join(client_thread, &status); |
4268 | if (ret != 0) { | |
76d7553f | 4269 | PERROR("pthread_join"); |
cf3af59e MD |
4270 | goto error; /* join error, exit without cleanup */ |
4271 | } | |
4272 | ||
3bd1e081 | 4273 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4274 | if (ret != 0) { |
76d7553f | 4275 | PERROR("join_consumer"); |
cf3af59e MD |
4276 | goto error; /* join error, exit without cleanup */ |
4277 | } | |
a88df331 | 4278 | |
06f525de DG |
4279 | ret = join_consumer_thread(&ustconsumer32_data); |
4280 | if (ret != 0) { | |
4281 | PERROR("join_consumer ust32"); | |
4282 | goto error; /* join error, exit without cleanup */ | |
4283 | } | |
4284 | ||
4285 | ret = join_consumer_thread(&ustconsumer64_data); | |
4286 | if (ret != 0) { | |
4287 | PERROR("join_consumer ust64"); | |
4288 | goto error; /* join error, exit without cleanup */ | |
4289 | } | |
4290 | ||
cf3af59e | 4291 | exit_client: |
06f525de DG |
4292 | ret = pthread_join(health_thread, &status); |
4293 | if (ret != 0) { | |
4294 | PERROR("pthread_join health thread"); | |
4295 | goto error; /* join error, exit without cleanup */ | |
4296 | } | |
4297 | ||
44a5e5eb | 4298 | exit_health: |
a88df331 | 4299 | exit: |
cf3af59e MD |
4300 | /* |
4301 | * cleanup() is called when no other thread is running. | |
4302 | */ | |
f6a9efaa | 4303 | rcu_thread_online(); |
cf3af59e | 4304 | cleanup(); |
f6a9efaa DG |
4305 | rcu_thread_offline(); |
4306 | rcu_unregister_thread(); | |
67e40797 | 4307 | if (!ret) { |
cf3af59e | 4308 | exit(EXIT_SUCCESS); |
67e40797 | 4309 | } |
cf3af59e | 4310 | error: |
5e16da05 | 4311 | exit(EXIT_FAILURE); |
fac6795d | 4312 | } |