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> |
d27c42b8 | 40 | #include <common/compat/socket.h> |
db758600 DG |
41 | #include <common/defaults.h> |
42 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 43 | #include <common/futex.h> |
00e2e675 | 44 | #include <common/relayd/relayd.h> |
81b86775 | 45 | #include <common/utils.h> |
fac6795d | 46 | |
10a8a223 | 47 | #include "lttng-sessiond.h" |
7972aab2 | 48 | #include "buffer-registry.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" |
d0b96690 | 64 | #include "ust-thread.h" |
fac6795d | 65 | |
ebaeda94 MD |
66 | #define CONSUMERD_FILE "lttng-consumerd" |
67 | ||
75462a81 | 68 | /* Const values */ |
bbccc3d2 | 69 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
686204ab | 70 | |
fac6795d DG |
71 | const char *progname; |
72 | const char *opt_tracing_group; | |
35f90c40 | 73 | static const char *opt_pidfile; |
5b8719f5 | 74 | static int opt_sig_parent; |
97e19046 | 75 | static int opt_verbose_consumer; |
fac6795d | 76 | static int opt_daemon; |
4fba7219 | 77 | static int opt_no_kernel; |
fac6795d | 78 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 79 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 80 | static char *rundir; |
3bd1e081 | 81 | |
a23ec3a7 DG |
82 | /* |
83 | * Consumer daemon specific control data. Every value not initialized here is | |
84 | * set to 0 by the static definition. | |
85 | */ | |
3bd1e081 MD |
86 | static struct consumer_data kconsumer_data = { |
87 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
88 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
89 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
90 | .err_sock = -1, |
91 | .cmd_sock = -1, | |
173af62f DG |
92 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
93 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
94 | .cond = PTHREAD_COND_INITIALIZER, |
95 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 96 | }; |
7753dea8 MD |
97 | static struct consumer_data ustconsumer64_data = { |
98 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
99 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
100 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
101 | .err_sock = -1, |
102 | .cmd_sock = -1, | |
173af62f DG |
103 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
104 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
105 | .cond = PTHREAD_COND_INITIALIZER, |
106 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
107 | }; |
108 | static struct consumer_data ustconsumer32_data = { | |
109 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
110 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
111 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
112 | .err_sock = -1, |
113 | .cmd_sock = -1, | |
173af62f DG |
114 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
115 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
116 | .cond = PTHREAD_COND_INITIALIZER, |
117 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
118 | }; |
119 | ||
26c9d55e | 120 | /* Shared between threads */ |
099e26bd | 121 | static int dispatch_thread_exit; |
fac6795d | 122 | |
54d01ffb DG |
123 | /* Global application Unix socket path */ |
124 | static char apps_unix_sock_path[PATH_MAX]; | |
125 | /* Global client Unix socket path */ | |
126 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
127 | /* global wait shm path for UST */ |
128 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
129 | /* Global health check unix path */ |
130 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 131 | |
1d4b027a | 132 | /* Sockets and FDs */ |
a4b35e07 MD |
133 | static int client_sock = -1; |
134 | static int apps_sock = -1; | |
2f77fc4b | 135 | int kernel_tracer_fd = -1; |
76d7553f | 136 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 137 | |
273ea72c DG |
138 | /* |
139 | * Quit pipe for all threads. This permits a single cancellation point | |
140 | * for all threads when receiving an event on the pipe. | |
141 | */ | |
76d7553f | 142 | static int thread_quit_pipe[2] = { -1, -1 }; |
273ea72c | 143 | |
099e26bd DG |
144 | /* |
145 | * This pipe is used to inform the thread managing application communication | |
146 | * that a command is queued and ready to be processed. | |
147 | */ | |
76d7553f | 148 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 149 | |
d0b96690 DG |
150 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
151 | ||
1d4b027a | 152 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 153 | static pthread_t apps_thread; |
d0b96690 | 154 | static pthread_t apps_notify_thread; |
099e26bd | 155 | static pthread_t reg_apps_thread; |
1d4b027a | 156 | static pthread_t client_thread; |
7a485870 | 157 | static pthread_t kernel_thread; |
099e26bd | 158 | static pthread_t dispatch_thread; |
44a5e5eb | 159 | static pthread_t health_thread; |
5eb91c98 | 160 | |
099e26bd DG |
161 | /* |
162 | * UST registration command queue. This queue is tied with a futex and uses a N | |
163 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
164 | * | |
165 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
166 | * this queue and the wait/wake scheme. | |
167 | */ | |
168 | static struct ust_cmd_queue ust_cmd_queue; | |
169 | ||
b5541356 DG |
170 | /* |
171 | * Pointer initialized before thread creation. | |
172 | * | |
173 | * This points to the tracing session list containing the session count and a | |
174 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
175 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 176 | * |
d063d709 | 177 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 178 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
179 | */ |
180 | static struct ltt_session_list *session_list_ptr; | |
181 | ||
7753dea8 MD |
182 | int ust_consumerd64_fd = -1; |
183 | int ust_consumerd32_fd = -1; | |
184 | ||
fb6f1fa2 YB |
185 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
186 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
187 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
188 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
fb09408a | 189 | |
2f77fc4b DG |
190 | static const char *module_proc_lttng = "/proc/lttng"; |
191 | ||
5c827ce0 DG |
192 | /* |
193 | * Consumer daemon state which is changed when spawning it, killing it or in | |
194 | * case of a fatal error. | |
195 | */ | |
196 | enum consumerd_state { | |
197 | CONSUMER_STARTED = 1, | |
198 | CONSUMER_STOPPED = 2, | |
199 | CONSUMER_ERROR = 3, | |
200 | }; | |
201 | ||
202 | /* | |
203 | * This consumer daemon state is used to validate if a client command will be | |
204 | * able to reach the consumer. If not, the client is informed. For instance, | |
205 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
206 | * error to the client. | |
207 | * | |
208 | * The following example shows a possible race condition of this scheme: | |
209 | * | |
210 | * consumer thread error happens | |
211 | * client cmd arrives | |
212 | * client cmd checks state -> still OK | |
213 | * consumer thread exit, sets error | |
214 | * client cmd try to talk to consumer | |
215 | * ... | |
216 | * | |
217 | * However, since the consumer is a different daemon, we have no way of making | |
218 | * sure the command will reach it safely even with this state flag. This is why | |
219 | * we consider that up to the state validation during command processing, the | |
220 | * command is safe. After that, we can not guarantee the correctness of the | |
221 | * client request vis-a-vis the consumer. | |
222 | */ | |
223 | static enum consumerd_state ust_consumerd_state; | |
224 | static enum consumerd_state kernel_consumerd_state; | |
225 | ||
ae9e45b3 DG |
226 | /* |
227 | * Socket timeout for receiving and sending in seconds. | |
228 | */ | |
229 | static int app_socket_timeout; | |
230 | ||
fb09408a | 231 | static |
7753dea8 | 232 | void setup_consumerd_path(void) |
fb09408a | 233 | { |
fc7a59ce | 234 | const char *bin, *libdir; |
fb09408a | 235 | |
7753dea8 MD |
236 | /* |
237 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
238 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
239 | * has not been defined. | |
7753dea8 | 240 | */ |
ebaeda94 | 241 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
242 | if (!consumerd32_bin[0]) { |
243 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
244 | } |
245 | if (!consumerd32_libdir[0]) { | |
246 | consumerd32_libdir = INSTALL_LIB_PATH; | |
247 | } | |
248 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
249 | if (!consumerd64_bin[0]) { |
250 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 251 | } |
ebaeda94 MD |
252 | if (!consumerd64_libdir[0]) { |
253 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
254 | } |
255 | #else | |
256 | #error "Unknown bitness" | |
257 | #endif | |
258 | ||
fb09408a MD |
259 | /* |
260 | * runtime env. var. overrides the build default. | |
261 | */ | |
fc7a59ce AM |
262 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
263 | if (bin) { | |
264 | consumerd32_bin = bin; | |
7753dea8 | 265 | } |
fc7a59ce AM |
266 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
267 | if (bin) { | |
268 | consumerd64_bin = bin; | |
ebaeda94 | 269 | } |
72f579ee | 270 | libdir = getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
271 | if (libdir) { |
272 | consumerd32_libdir = libdir; | |
273 | } | |
72f579ee | 274 | libdir = getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
275 | if (libdir) { |
276 | consumerd64_libdir = libdir; | |
fb09408a MD |
277 | } |
278 | } | |
279 | ||
5eb91c98 DG |
280 | /* |
281 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
282 | */ | |
d0b96690 | 283 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) |
5eb91c98 DG |
284 | { |
285 | int ret; | |
286 | ||
d0b96690 | 287 | assert(events); |
5eb91c98 DG |
288 | |
289 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
290 | if (ret < 0) { | |
291 | goto error; | |
292 | } | |
293 | ||
294 | /* Add quit pipe */ | |
d0b96690 | 295 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
296 | if (ret < 0) { |
297 | goto error; | |
298 | } | |
299 | ||
300 | return 0; | |
301 | ||
302 | error: | |
303 | return ret; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Check if the thread quit pipe was triggered. | |
308 | * | |
309 | * Return 1 if it was triggered else 0; | |
310 | */ | |
d0b96690 | 311 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
5eb91c98 DG |
312 | { |
313 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
314 | return 1; | |
315 | } | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
0fdd1e2c DG |
320 | /* |
321 | * Return group ID of the tracing group or -1 if not found. | |
322 | */ | |
996b65c8 MD |
323 | static gid_t allowed_group(void) |
324 | { | |
325 | struct group *grp; | |
326 | ||
274e143b MD |
327 | if (opt_tracing_group) { |
328 | grp = getgrnam(opt_tracing_group); | |
329 | } else { | |
330 | grp = getgrnam(default_tracing_group); | |
331 | } | |
996b65c8 MD |
332 | if (!grp) { |
333 | return -1; | |
334 | } else { | |
335 | return grp->gr_gid; | |
336 | } | |
337 | } | |
338 | ||
273ea72c | 339 | /* |
5eb91c98 | 340 | * Init thread quit pipe. |
273ea72c DG |
341 | * |
342 | * Return -1 on error or 0 if all pipes are created. | |
343 | */ | |
344 | static int init_thread_quit_pipe(void) | |
345 | { | |
730389d9 | 346 | int ret, i; |
273ea72c | 347 | |
730389d9 | 348 | ret = pipe(thread_quit_pipe); |
273ea72c | 349 | if (ret < 0) { |
730389d9 | 350 | PERROR("thread quit pipe"); |
273ea72c DG |
351 | goto error; |
352 | } | |
353 | ||
730389d9 DG |
354 | for (i = 0; i < 2; i++) { |
355 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
356 | if (ret < 0) { | |
357 | PERROR("fcntl"); | |
358 | goto error; | |
359 | } | |
360 | } | |
361 | ||
273ea72c DG |
362 | error: |
363 | return ret; | |
364 | } | |
365 | ||
099e26bd DG |
366 | /* |
367 | * Stop all threads by closing the thread quit pipe. | |
368 | */ | |
cf3af59e MD |
369 | static void stop_threads(void) |
370 | { | |
5eb91c98 DG |
371 | int ret; |
372 | ||
cf3af59e MD |
373 | /* Stopping all threads */ |
374 | DBG("Terminating all threads"); | |
54d01ffb | 375 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
376 | if (ret < 0) { |
377 | ERR("write error on thread quit pipe"); | |
378 | } | |
379 | ||
099e26bd | 380 | /* Dispatch thread */ |
26c9d55e | 381 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 382 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
383 | } |
384 | ||
fac6795d | 385 | /* |
d063d709 | 386 | * Cleanup the daemon |
fac6795d | 387 | */ |
cf3af59e | 388 | static void cleanup(void) |
fac6795d | 389 | { |
ef599319 | 390 | int ret; |
6620da75 | 391 | char *cmd = NULL; |
af9737e9 | 392 | struct ltt_session *sess, *stmp; |
fac6795d | 393 | |
1d4b027a | 394 | DBG("Cleaning up"); |
e07ae692 | 395 | |
2f77fc4b DG |
396 | /* First thing first, stop all threads */ |
397 | utils_close_pipe(thread_quit_pipe); | |
398 | ||
35f90c40 DG |
399 | /* |
400 | * If opt_pidfile is undefined, the default file will be wiped when | |
401 | * removing the rundir. | |
402 | */ | |
403 | if (opt_pidfile) { | |
404 | ret = remove(opt_pidfile); | |
405 | if (ret < 0) { | |
406 | PERROR("remove pidfile %s", opt_pidfile); | |
407 | } | |
408 | } | |
409 | ||
67e40797 DG |
410 | DBG("Removing %s directory", rundir); |
411 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
412 | if (ret < 0) { | |
413 | ERR("asprintf failed. Something is really wrong!"); | |
414 | } | |
5461b305 | 415 | |
67e40797 DG |
416 | /* Remove lttng run directory */ |
417 | ret = system(cmd); | |
418 | if (ret < 0) { | |
419 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 420 | } |
67e40797 | 421 | free(cmd); |
bd69add2 | 422 | free(rundir); |
5461b305 | 423 | |
99bab54f | 424 | DBG("Cleaning up all sessions"); |
fac6795d | 425 | |
b5541356 | 426 | /* Destroy session list mutex */ |
273ea72c DG |
427 | if (session_list_ptr != NULL) { |
428 | pthread_mutex_destroy(&session_list_ptr->lock); | |
429 | ||
430 | /* Cleanup ALL session */ | |
54d01ffb DG |
431 | cds_list_for_each_entry_safe(sess, stmp, |
432 | &session_list_ptr->head, list) { | |
2f77fc4b | 433 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
434 | } |
435 | } | |
436 | ||
099e26bd | 437 | DBG("Closing all UST sockets"); |
56fff090 | 438 | ust_app_clean_list(); |
7972aab2 | 439 | buffer_reg_destroy_registries(); |
099e26bd | 440 | |
4fba7219 DG |
441 | if (is_root && !opt_no_kernel) { |
442 | DBG2("Closing kernel fd"); | |
a4b35e07 | 443 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
444 | ret = close(kernel_tracer_fd); |
445 | if (ret) { | |
446 | PERROR("close"); | |
447 | } | |
a4b35e07 | 448 | } |
2f50c8a3 | 449 | DBG("Unloading kernel modules"); |
096102bd | 450 | modprobe_remove_lttng_all(); |
2f50c8a3 | 451 | } |
2f77fc4b | 452 | |
421cb601 | 453 | /* <fun> */ |
f56a39af | 454 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
455 | "Matthew, BEET driven development works!%c[%dm", |
456 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
457 | /* </fun> */ | |
fac6795d DG |
458 | } |
459 | ||
e065084a | 460 | /* |
d063d709 | 461 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 462 | * |
d063d709 | 463 | * Return lttcomm error code. |
e065084a DG |
464 | */ |
465 | static int send_unix_sock(int sock, void *buf, size_t len) | |
466 | { | |
467 | /* Check valid length */ | |
c617c0c6 | 468 | if (len == 0) { |
e065084a DG |
469 | return -1; |
470 | } | |
471 | ||
472 | return lttcomm_send_unix_sock(sock, buf, len); | |
473 | } | |
474 | ||
5461b305 | 475 | /* |
d063d709 | 476 | * Free memory of a command context structure. |
5461b305 | 477 | */ |
a2fb29a5 | 478 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 479 | { |
a2fb29a5 DG |
480 | DBG("Clean command context structure"); |
481 | if (*cmd_ctx) { | |
482 | if ((*cmd_ctx)->llm) { | |
483 | free((*cmd_ctx)->llm); | |
5461b305 | 484 | } |
a2fb29a5 DG |
485 | if ((*cmd_ctx)->lsm) { |
486 | free((*cmd_ctx)->lsm); | |
5461b305 | 487 | } |
a2fb29a5 DG |
488 | free(*cmd_ctx); |
489 | *cmd_ctx = NULL; | |
5461b305 DG |
490 | } |
491 | } | |
492 | ||
fac6795d | 493 | /* |
0fdd1e2c | 494 | * Notify UST applications using the shm mmap futex. |
fac6795d | 495 | */ |
0fdd1e2c | 496 | static int notify_ust_apps(int active) |
fac6795d | 497 | { |
0fdd1e2c | 498 | char *wait_shm_mmap; |
fac6795d | 499 | |
0fdd1e2c | 500 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 501 | |
0fdd1e2c DG |
502 | /* See shm.c for this call implying mmap, shm and futex calls */ |
503 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
504 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
505 | goto error; |
506 | } | |
507 | ||
0fdd1e2c DG |
508 | /* Wake waiting process */ |
509 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
510 | ||
511 | /* Apps notified successfully */ | |
512 | return 0; | |
fac6795d DG |
513 | |
514 | error: | |
0fdd1e2c | 515 | return -1; |
fac6795d DG |
516 | } |
517 | ||
e065084a | 518 | /* |
d063d709 DG |
519 | * Setup the outgoing data buffer for the response (llm) by allocating the |
520 | * right amount of memory and copying the original information from the lsm | |
521 | * structure. | |
ca95a216 | 522 | * |
d063d709 | 523 | * Return total size of the buffer pointed by buf. |
ca95a216 | 524 | */ |
5461b305 | 525 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 526 | { |
f3ed775e | 527 | int ret, buf_size; |
ca95a216 | 528 | |
f3ed775e | 529 | buf_size = size; |
5461b305 | 530 | |
ba7f0ae5 | 531 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 532 | if (cmd_ctx->llm == NULL) { |
76d7553f | 533 | PERROR("zmalloc"); |
5461b305 | 534 | ret = -ENOMEM; |
ca95a216 DG |
535 | goto error; |
536 | } | |
537 | ||
5461b305 DG |
538 | /* Copy common data */ |
539 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 540 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 541 | |
5461b305 DG |
542 | cmd_ctx->llm->data_size = size; |
543 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
544 | ||
ca95a216 DG |
545 | return buf_size; |
546 | ||
547 | error: | |
548 | return ret; | |
549 | } | |
550 | ||
7a485870 | 551 | /* |
5eb91c98 | 552 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 553 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 554 | */ |
5eb91c98 | 555 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 556 | { |
5eb91c98 | 557 | int ret; |
7a485870 DG |
558 | struct ltt_session *session; |
559 | struct ltt_kernel_channel *channel; | |
560 | ||
5eb91c98 | 561 | DBG("Updating kernel poll set"); |
7a485870 | 562 | |
54d01ffb | 563 | session_lock_list(); |
b5541356 | 564 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 565 | session_lock(session); |
7a485870 | 566 | if (session->kernel_session == NULL) { |
54d01ffb | 567 | session_unlock(session); |
7a485870 DG |
568 | continue; |
569 | } | |
7a485870 | 570 | |
54d01ffb DG |
571 | cds_list_for_each_entry(channel, |
572 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
573 | /* Add channel fd to the kernel poll set */ |
574 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
575 | if (ret < 0) { | |
54d01ffb | 576 | session_unlock(session); |
5eb91c98 DG |
577 | goto error; |
578 | } | |
579 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 580 | } |
54d01ffb | 581 | session_unlock(session); |
7a485870 | 582 | } |
54d01ffb | 583 | session_unlock_list(); |
7a485870 | 584 | |
5eb91c98 | 585 | return 0; |
7a485870 DG |
586 | |
587 | error: | |
54d01ffb | 588 | session_unlock_list(); |
7a485870 DG |
589 | return -1; |
590 | } | |
591 | ||
592 | /* | |
54d01ffb | 593 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 594 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 595 | * |
d063d709 | 596 | * Useful for CPU hotplug feature. |
7a485870 | 597 | */ |
2bdd86d4 | 598 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
599 | { |
600 | int ret = 0; | |
601 | struct ltt_session *session; | |
173af62f | 602 | struct ltt_kernel_session *ksess; |
7a485870 DG |
603 | struct ltt_kernel_channel *channel; |
604 | ||
605 | DBG("Updating kernel streams for channel fd %d", fd); | |
606 | ||
54d01ffb | 607 | session_lock_list(); |
b5541356 | 608 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 609 | session_lock(session); |
7a485870 | 610 | if (session->kernel_session == NULL) { |
54d01ffb | 611 | session_unlock(session); |
7a485870 DG |
612 | continue; |
613 | } | |
173af62f | 614 | ksess = session->kernel_session; |
d9800920 | 615 | |
173af62f | 616 | cds_list_for_each_entry(channel, &ksess->channel_list.head, list) { |
7a485870 DG |
617 | if (channel->fd == fd) { |
618 | DBG("Channel found, updating kernel streams"); | |
619 | ret = kernel_open_channel_stream(channel); | |
620 | if (ret < 0) { | |
b3c750d2 | 621 | goto error; |
7a485870 | 622 | } |
d9800920 | 623 | |
7a485870 | 624 | /* |
5eb91c98 DG |
625 | * Have we already sent fds to the consumer? If yes, it means |
626 | * that tracing is started so it is safe to send our updated | |
627 | * stream fds. | |
7a485870 | 628 | */ |
173af62f DG |
629 | if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) { |
630 | struct lttng_ht_iter iter; | |
631 | struct consumer_socket *socket; | |
632 | ||
e7fe706f | 633 | rcu_read_lock(); |
173af62f DG |
634 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
635 | &iter.iter, socket, node.node) { | |
636 | /* Code flow error */ | |
637 | assert(socket->fd >= 0); | |
638 | ||
639 | pthread_mutex_lock(socket->lock); | |
f50f23d9 | 640 | ret = kernel_consumer_send_channel_stream(socket, |
173af62f DG |
641 | channel, ksess); |
642 | pthread_mutex_unlock(socket->lock); | |
643 | if (ret < 0) { | |
e7fe706f | 644 | rcu_read_unlock(); |
173af62f DG |
645 | goto error; |
646 | } | |
7a485870 | 647 | } |
e7fe706f | 648 | rcu_read_unlock(); |
7a485870 | 649 | } |
b3c750d2 | 650 | goto error; |
7a485870 DG |
651 | } |
652 | } | |
54d01ffb | 653 | session_unlock(session); |
7a485870 | 654 | } |
54d01ffb | 655 | session_unlock_list(); |
b3c750d2 | 656 | return ret; |
7a485870 | 657 | |
b3c750d2 | 658 | error: |
54d01ffb DG |
659 | session_unlock(session); |
660 | session_unlock_list(); | |
7a485870 DG |
661 | return ret; |
662 | } | |
663 | ||
487cf67c | 664 | /* |
ffe60014 DG |
665 | * For each tracing session, update newly registered apps. The session list |
666 | * lock MUST be acquired before calling this. | |
487cf67c DG |
667 | */ |
668 | static void update_ust_app(int app_sock) | |
669 | { | |
670 | struct ltt_session *sess, *stmp; | |
671 | ||
672 | /* For all tracing session(s) */ | |
673 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
4ee14516 | 674 | session_lock(sess); |
421cb601 DG |
675 | if (sess->ust_session) { |
676 | ust_app_global_update(sess->ust_session, app_sock); | |
677 | } | |
4ee14516 | 678 | session_unlock(sess); |
487cf67c DG |
679 | } |
680 | } | |
681 | ||
7a485870 | 682 | /* |
d063d709 | 683 | * This thread manage event coming from the kernel. |
7a485870 | 684 | * |
d063d709 DG |
685 | * Features supported in this thread: |
686 | * -) CPU Hotplug | |
7a485870 DG |
687 | */ |
688 | static void *thread_manage_kernel(void *data) | |
689 | { | |
139ac872 | 690 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 691 | uint32_t revents, nb_fd; |
7a485870 | 692 | char tmp; |
5eb91c98 | 693 | struct lttng_poll_event events; |
7a485870 | 694 | |
6993eeb3 | 695 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 696 | |
927ca06a DG |
697 | health_register(HEALTH_TYPE_KERNEL); |
698 | ||
d5d63bf1 DG |
699 | /* |
700 | * This first step of the while is to clean this structure which could free | |
701 | * non NULL pointers so zero it before the loop. | |
702 | */ | |
703 | memset(&events, 0, sizeof(events)); | |
704 | ||
6993eeb3 CB |
705 | if (testpoint(thread_manage_kernel)) { |
706 | goto error_testpoint; | |
707 | } | |
8ac94142 | 708 | |
840cb59c | 709 | health_code_update(); |
44a5e5eb | 710 | |
6993eeb3 | 711 | if (testpoint(thread_manage_kernel_before_loop)) { |
d21b0d71 | 712 | goto error_testpoint; |
6993eeb3 CB |
713 | } |
714 | ||
7a485870 | 715 | while (1) { |
840cb59c | 716 | health_code_update(); |
44a5e5eb | 717 | |
7a485870 | 718 | if (update_poll_flag == 1) { |
d21b0d71 DG |
719 | /* Clean events object. We are about to populate it again. */ |
720 | lttng_poll_clean(&events); | |
721 | ||
d0b96690 | 722 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
723 | if (ret < 0) { |
724 | goto error_poll_create; | |
725 | } | |
726 | ||
727 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
728 | if (ret < 0) { | |
729 | goto error; | |
730 | } | |
5f822d0a | 731 | |
d21b0d71 | 732 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
733 | ret = update_kernel_poll(&events); |
734 | if (ret < 0) { | |
7a485870 DG |
735 | goto error; |
736 | } | |
737 | update_poll_flag = 0; | |
738 | } | |
739 | ||
d21b0d71 | 740 | DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events)); |
7a485870 DG |
741 | |
742 | /* Poll infinite value of time */ | |
88f2b785 | 743 | restart: |
a78af745 | 744 | health_poll_entry(); |
5eb91c98 | 745 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 746 | health_poll_exit(); |
7a485870 | 747 | if (ret < 0) { |
88f2b785 MD |
748 | /* |
749 | * Restart interrupted system call. | |
750 | */ | |
751 | if (errno == EINTR) { | |
752 | goto restart; | |
753 | } | |
7a485870 DG |
754 | goto error; |
755 | } else if (ret == 0) { | |
756 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
757 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
758 | "This should not have happened! Continuing..."); | |
7a485870 DG |
759 | continue; |
760 | } | |
761 | ||
0d9c5d77 DG |
762 | nb_fd = ret; |
763 | ||
5eb91c98 DG |
764 | for (i = 0; i < nb_fd; i++) { |
765 | /* Fetch once the poll data */ | |
766 | revents = LTTNG_POLL_GETEV(&events, i); | |
767 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 768 | |
840cb59c | 769 | health_code_update(); |
44a5e5eb | 770 | |
5eb91c98 | 771 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 772 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 773 | if (ret) { |
139ac872 MD |
774 | err = 0; |
775 | goto exit; | |
5eb91c98 | 776 | } |
7a485870 | 777 | |
5eb91c98 DG |
778 | /* Check for data on kernel pipe */ |
779 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
f921c78f DG |
780 | do { |
781 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
782 | } while (ret < 0 && errno == EINTR); | |
783 | /* | |
784 | * Ret value is useless here, if this pipe gets any actions an | |
785 | * update is required anyway. | |
786 | */ | |
5eb91c98 DG |
787 | update_poll_flag = 1; |
788 | continue; | |
789 | } else { | |
790 | /* | |
791 | * New CPU detected by the kernel. Adding kernel stream to | |
792 | * kernel session and updating the kernel consumer | |
793 | */ | |
794 | if (revents & LPOLLIN) { | |
2bdd86d4 | 795 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
796 | if (ret < 0) { |
797 | continue; | |
798 | } | |
799 | break; | |
800 | /* | |
801 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
802 | * and unregister kernel stream at this point. | |
803 | */ | |
7a485870 | 804 | } |
7a485870 DG |
805 | } |
806 | } | |
807 | } | |
808 | ||
139ac872 | 809 | exit: |
7a485870 | 810 | error: |
5eb91c98 | 811 | lttng_poll_clean(&events); |
76d7553f | 812 | error_poll_create: |
6993eeb3 | 813 | error_testpoint: |
6620da75 DG |
814 | utils_close_pipe(kernel_poll_pipe); |
815 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 816 | if (err) { |
840cb59c | 817 | health_error(); |
139ac872 | 818 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
819 | WARN("Kernel thread died unexpectedly. " |
820 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 821 | } |
927ca06a | 822 | health_unregister(); |
76d7553f | 823 | DBG("Kernel thread dying"); |
7a485870 DG |
824 | return NULL; |
825 | } | |
826 | ||
a23ec3a7 DG |
827 | /* |
828 | * Signal pthread condition of the consumer data that the thread. | |
829 | */ | |
830 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
831 | { | |
832 | pthread_mutex_lock(&data->cond_mutex); | |
833 | ||
834 | /* | |
835 | * The state is set before signaling. It can be any value, it's the waiter | |
836 | * job to correctly interpret this condition variable associated to the | |
837 | * consumer pthread_cond. | |
838 | * | |
839 | * A value of 0 means that the corresponding thread of the consumer data | |
840 | * was not started. 1 indicates that the thread has started and is ready | |
841 | * for action. A negative value means that there was an error during the | |
842 | * thread bootstrap. | |
843 | */ | |
844 | data->consumer_thread_is_ready = state; | |
845 | (void) pthread_cond_signal(&data->cond); | |
846 | ||
847 | pthread_mutex_unlock(&data->cond_mutex); | |
848 | } | |
849 | ||
1d4b027a | 850 | /* |
3bd1e081 | 851 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 852 | */ |
3bd1e081 | 853 | static void *thread_manage_consumer(void *data) |
1d4b027a | 854 | { |
139ac872 | 855 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 | 856 | uint32_t revents, nb_fd; |
1d4b027a | 857 | enum lttcomm_return_code code; |
5eb91c98 | 858 | struct lttng_poll_event events; |
3bd1e081 | 859 | struct consumer_data *consumer_data = data; |
1d4b027a | 860 | |
3bd1e081 | 861 | DBG("[thread] Manage consumer started"); |
1d4b027a | 862 | |
927ca06a DG |
863 | health_register(HEALTH_TYPE_CONSUMER); |
864 | ||
855060f8 | 865 | health_code_update(); |
9449cc75 | 866 | |
5eb91c98 DG |
867 | /* |
868 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
869 | * Nothing more will be added to this poll set. | |
870 | */ | |
d0b96690 | 871 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 872 | if (ret < 0) { |
76d7553f | 873 | goto error_poll; |
5eb91c98 | 874 | } |
273ea72c | 875 | |
edb8b045 DG |
876 | /* |
877 | * The error socket here is already in a listening state which was done | |
878 | * just before spawning this thread to avoid a race between the consumer | |
879 | * daemon exec trying to connect and the listen() call. | |
880 | */ | |
3bd1e081 | 881 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
882 | if (ret < 0) { |
883 | goto error; | |
884 | } | |
885 | ||
840cb59c | 886 | health_code_update(); |
44a5e5eb | 887 | |
273ea72c | 888 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 889 | restart: |
a78af745 | 890 | health_poll_entry(); |
8ac94142 | 891 | |
6993eeb3 CB |
892 | if (testpoint(thread_manage_consumer)) { |
893 | goto error; | |
894 | } | |
8ac94142 | 895 | |
5eb91c98 | 896 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 897 | health_poll_exit(); |
273ea72c | 898 | if (ret < 0) { |
88f2b785 MD |
899 | /* |
900 | * Restart interrupted system call. | |
901 | */ | |
902 | if (errno == EINTR) { | |
903 | goto restart; | |
904 | } | |
273ea72c DG |
905 | goto error; |
906 | } | |
907 | ||
0d9c5d77 DG |
908 | nb_fd = ret; |
909 | ||
5eb91c98 DG |
910 | for (i = 0; i < nb_fd; i++) { |
911 | /* Fetch once the poll data */ | |
912 | revents = LTTNG_POLL_GETEV(&events, i); | |
913 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
914 | ||
840cb59c | 915 | health_code_update(); |
44a5e5eb | 916 | |
5eb91c98 | 917 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 918 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 919 | if (ret) { |
139ac872 MD |
920 | err = 0; |
921 | goto exit; | |
5eb91c98 DG |
922 | } |
923 | ||
924 | /* Event on the registration socket */ | |
3bd1e081 | 925 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 926 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 927 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
928 | goto error; |
929 | } | |
930 | } | |
273ea72c DG |
931 | } |
932 | ||
3bd1e081 | 933 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
934 | if (sock < 0) { |
935 | goto error; | |
936 | } | |
937 | ||
b662582b DG |
938 | /* |
939 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
940 | * show must go on. | |
941 | */ | |
942 | (void) utils_set_fd_cloexec(sock); | |
943 | ||
840cb59c | 944 | health_code_update(); |
44a5e5eb | 945 | |
3bd1e081 | 946 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 947 | |
712ea556 | 948 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
949 | ret = lttcomm_recv_unix_sock(sock, &code, |
950 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
951 | if (ret <= 0) { |
952 | goto error; | |
953 | } | |
954 | ||
840cb59c | 955 | health_code_update(); |
44a5e5eb | 956 | |
f73fabfd | 957 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 MD |
958 | consumer_data->cmd_sock = |
959 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
960 | if (consumer_data->cmd_sock < 0) { | |
a23ec3a7 DG |
961 | /* On error, signal condition and quit. */ |
962 | signal_consumer_condition(consumer_data, -1); | |
48842b30 | 963 | PERROR("consumer connect"); |
1d4b027a DG |
964 | goto error; |
965 | } | |
a23ec3a7 DG |
966 | signal_consumer_condition(consumer_data, 1); |
967 | DBG("Consumer command socket ready"); | |
1d4b027a | 968 | } else { |
3bd1e081 | 969 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
970 | lttcomm_get_readable_code(-code)); |
971 | goto error; | |
972 | } | |
973 | ||
54d01ffb | 974 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 975 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 976 | if (ret < 0) { |
72079cae DG |
977 | goto error; |
978 | } | |
979 | ||
5eb91c98 DG |
980 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
981 | if (ret < 0) { | |
72079cae | 982 | goto error; |
5eb91c98 DG |
983 | } |
984 | ||
840cb59c | 985 | health_code_update(); |
44a5e5eb | 986 | |
5eb91c98 | 987 | /* Inifinite blocking call, waiting for transmission */ |
88f2b785 | 988 | restart_poll: |
a78af745 | 989 | health_poll_entry(); |
5eb91c98 | 990 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 991 | health_poll_exit(); |
5eb91c98 | 992 | if (ret < 0) { |
88f2b785 MD |
993 | /* |
994 | * Restart interrupted system call. | |
995 | */ | |
996 | if (errno == EINTR) { | |
997 | goto restart_poll; | |
998 | } | |
72079cae DG |
999 | goto error; |
1000 | } | |
1001 | ||
0d9c5d77 DG |
1002 | nb_fd = ret; |
1003 | ||
5eb91c98 DG |
1004 | for (i = 0; i < nb_fd; i++) { |
1005 | /* Fetch once the poll data */ | |
1006 | revents = LTTNG_POLL_GETEV(&events, i); | |
1007 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1008 | ||
840cb59c | 1009 | health_code_update(); |
44a5e5eb | 1010 | |
5eb91c98 | 1011 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1012 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1013 | if (ret) { |
139ac872 MD |
1014 | err = 0; |
1015 | goto exit; | |
5eb91c98 DG |
1016 | } |
1017 | ||
1018 | /* Event on the kconsumerd socket */ | |
1019 | if (pollfd == sock) { | |
1020 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1021 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1022 | goto error; |
1023 | } | |
1024 | } | |
1025 | } | |
1026 | ||
840cb59c | 1027 | health_code_update(); |
44a5e5eb | 1028 | |
712ea556 | 1029 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1030 | ret = lttcomm_recv_unix_sock(sock, &code, |
1031 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1032 | if (ret <= 0) { |
3bd1e081 | 1033 | ERR("consumer closed the command socket"); |
712ea556 | 1034 | goto error; |
6f61d021 | 1035 | } |
1d4b027a | 1036 | |
3bd1e081 | 1037 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1038 | |
139ac872 | 1039 | exit: |
1d4b027a | 1040 | error: |
5c827ce0 DG |
1041 | /* Immediately set the consumerd state to stopped */ |
1042 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1043 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1044 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1045 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1046 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1047 | } else { | |
1048 | /* Code flow error... */ | |
1049 | assert(0); | |
1050 | } | |
1051 | ||
76d7553f MD |
1052 | if (consumer_data->err_sock >= 0) { |
1053 | ret = close(consumer_data->err_sock); | |
1054 | if (ret) { | |
1055 | PERROR("close"); | |
1056 | } | |
1057 | } | |
1058 | if (consumer_data->cmd_sock >= 0) { | |
1059 | ret = close(consumer_data->cmd_sock); | |
1060 | if (ret) { | |
1061 | PERROR("close"); | |
1062 | } | |
1063 | } | |
1064 | if (sock >= 0) { | |
1065 | ret = close(sock); | |
1066 | if (ret) { | |
1067 | PERROR("close"); | |
1068 | } | |
1069 | } | |
273ea72c | 1070 | |
3bd1e081 MD |
1071 | unlink(consumer_data->err_unix_sock_path); |
1072 | unlink(consumer_data->cmd_unix_sock_path); | |
1073 | consumer_data->pid = 0; | |
1d4b027a | 1074 | |
5eb91c98 | 1075 | lttng_poll_clean(&events); |
76d7553f | 1076 | error_poll: |
139ac872 | 1077 | if (err) { |
840cb59c | 1078 | health_error(); |
139ac872 MD |
1079 | ERR("Health error occurred in %s", __func__); |
1080 | } | |
927ca06a | 1081 | health_unregister(); |
76d7553f | 1082 | DBG("consumer thread cleanup completed"); |
0177d773 | 1083 | |
5eb91c98 | 1084 | return NULL; |
099e26bd DG |
1085 | } |
1086 | ||
099e26bd DG |
1087 | /* |
1088 | * This thread manage application communication. | |
1d4b027a DG |
1089 | */ |
1090 | static void *thread_manage_apps(void *data) | |
099e26bd | 1091 | { |
139ac872 | 1092 | int i, ret, pollfd, err = -1; |
5eb91c98 | 1093 | uint32_t revents, nb_fd; |
5eb91c98 | 1094 | struct lttng_poll_event events; |
099e26bd DG |
1095 | |
1096 | DBG("[thread] Manage application started"); | |
1097 | ||
f6a9efaa DG |
1098 | rcu_register_thread(); |
1099 | rcu_thread_online(); | |
1100 | ||
927ca06a DG |
1101 | health_register(HEALTH_TYPE_APP_MANAGE); |
1102 | ||
6993eeb3 CB |
1103 | if (testpoint(thread_manage_apps)) { |
1104 | goto error_testpoint; | |
1105 | } | |
1106 | ||
840cb59c | 1107 | health_code_update(); |
44a5e5eb | 1108 | |
d0b96690 | 1109 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1110 | if (ret < 0) { |
76d7553f | 1111 | goto error_poll_create; |
5eb91c98 | 1112 | } |
099e26bd | 1113 | |
5eb91c98 DG |
1114 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1115 | if (ret < 0) { | |
1116 | goto error; | |
1117 | } | |
099e26bd | 1118 | |
6993eeb3 CB |
1119 | if (testpoint(thread_manage_apps_before_loop)) { |
1120 | goto error; | |
1121 | } | |
8ac94142 | 1122 | |
840cb59c | 1123 | health_code_update(); |
44a5e5eb | 1124 | |
5eb91c98 | 1125 | while (1) { |
d21b0d71 | 1126 | DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events)); |
099e26bd DG |
1127 | |
1128 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1129 | restart: |
a78af745 | 1130 | health_poll_entry(); |
5eb91c98 | 1131 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1132 | health_poll_exit(); |
099e26bd | 1133 | if (ret < 0) { |
88f2b785 MD |
1134 | /* |
1135 | * Restart interrupted system call. | |
1136 | */ | |
1137 | if (errno == EINTR) { | |
1138 | goto restart; | |
1139 | } | |
099e26bd DG |
1140 | goto error; |
1141 | } | |
1142 | ||
0d9c5d77 DG |
1143 | nb_fd = ret; |
1144 | ||
5eb91c98 DG |
1145 | for (i = 0; i < nb_fd; i++) { |
1146 | /* Fetch once the poll data */ | |
1147 | revents = LTTNG_POLL_GETEV(&events, i); | |
1148 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1149 | ||
840cb59c | 1150 | health_code_update(); |
44a5e5eb | 1151 | |
5eb91c98 | 1152 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1153 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1154 | if (ret) { |
139ac872 MD |
1155 | err = 0; |
1156 | goto exit; | |
5eb91c98 | 1157 | } |
099e26bd | 1158 | |
5eb91c98 DG |
1159 | /* Inspect the apps cmd pipe */ |
1160 | if (pollfd == apps_cmd_pipe[0]) { | |
1161 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1162 | ERR("Apps command pipe error"); | |
0177d773 | 1163 | goto error; |
5eb91c98 | 1164 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1165 | int sock; |
1166 | ||
5eb91c98 | 1167 | /* Empty pipe */ |
f921c78f | 1168 | do { |
d0b96690 | 1169 | ret = read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
f921c78f | 1170 | } while (ret < 0 && errno == EINTR); |
d0b96690 | 1171 | if (ret < 0 || ret < sizeof(sock)) { |
76d7553f | 1172 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1173 | goto error; |
1174 | } | |
099e26bd | 1175 | |
840cb59c | 1176 | health_code_update(); |
44a5e5eb | 1177 | |
ffe60014 | 1178 | /* |
d0b96690 DG |
1179 | * We only monitor the error events of the socket. This |
1180 | * thread does not handle any incoming data from UST | |
1181 | * (POLLIN). | |
ffe60014 | 1182 | */ |
d0b96690 DG |
1183 | ret = lttng_poll_add(&events, sock, |
1184 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1185 | if (ret < 0) { | |
5eb91c98 | 1186 | goto error; |
e0c7ec2b | 1187 | } |
acc7b41b | 1188 | |
d0b96690 DG |
1189 | /* Set socket timeout for both receiving and ending */ |
1190 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
1191 | app_socket_timeout); | |
1192 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
1193 | app_socket_timeout); | |
ae9e45b3 | 1194 | |
d0b96690 | 1195 | DBG("Apps with sock %d added to poll set", sock); |
487cf67c | 1196 | |
840cb59c | 1197 | health_code_update(); |
44a5e5eb | 1198 | |
5eb91c98 | 1199 | break; |
0177d773 | 1200 | } |
5eb91c98 DG |
1201 | } else { |
1202 | /* | |
54d01ffb DG |
1203 | * At this point, we know that a registered application made |
1204 | * the event at poll_wait. | |
5eb91c98 DG |
1205 | */ |
1206 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1207 | /* Removing from the poll set */ | |
1208 | ret = lttng_poll_del(&events, pollfd); | |
1209 | if (ret < 0) { | |
1210 | goto error; | |
1211 | } | |
099e26bd | 1212 | |
b9d9b220 | 1213 | /* Socket closed on remote end. */ |
56fff090 | 1214 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1215 | break; |
1216 | } | |
099e26bd | 1217 | } |
44a5e5eb | 1218 | |
840cb59c | 1219 | health_code_update(); |
099e26bd | 1220 | } |
099e26bd DG |
1221 | } |
1222 | ||
139ac872 | 1223 | exit: |
099e26bd | 1224 | error: |
5eb91c98 | 1225 | lttng_poll_clean(&events); |
76d7553f | 1226 | error_poll_create: |
6993eeb3 | 1227 | error_testpoint: |
6620da75 DG |
1228 | utils_close_pipe(apps_cmd_pipe); |
1229 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1230 | ||
1231 | /* | |
1232 | * We don't clean the UST app hash table here since already registered | |
1233 | * applications can still be controlled so let them be until the session | |
1234 | * daemon dies or the applications stop. | |
1235 | */ | |
1236 | ||
139ac872 | 1237 | if (err) { |
840cb59c | 1238 | health_error(); |
139ac872 MD |
1239 | ERR("Health error occurred in %s", __func__); |
1240 | } | |
927ca06a | 1241 | health_unregister(); |
76d7553f | 1242 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1243 | rcu_thread_offline(); |
1244 | rcu_unregister_thread(); | |
099e26bd DG |
1245 | return NULL; |
1246 | } | |
1247 | ||
d0b96690 | 1248 | /* |
d88aee68 DG |
1249 | * Send a socket to a thread This is called from the dispatch UST registration |
1250 | * thread once all sockets are set for the application. | |
d0b96690 DG |
1251 | * |
1252 | * On success, return 0 else a negative value being the errno message of the | |
1253 | * write(). | |
1254 | */ | |
d88aee68 | 1255 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 DG |
1256 | { |
1257 | int ret; | |
1258 | ||
d0b96690 | 1259 | /* Sockets MUST be set or else this should not have been called. */ |
d88aee68 DG |
1260 | assert(fd >= 0); |
1261 | assert(sock >= 0); | |
d0b96690 DG |
1262 | |
1263 | do { | |
d88aee68 | 1264 | ret = write(fd, &sock, sizeof(sock)); |
d0b96690 | 1265 | } while (ret < 0 && errno == EINTR); |
d88aee68 DG |
1266 | if (ret < 0 || ret != sizeof(sock)) { |
1267 | PERROR("write apps pipe %d", fd); | |
d0b96690 DG |
1268 | if (ret < 0) { |
1269 | ret = -errno; | |
1270 | } | |
1271 | goto error; | |
1272 | } | |
1273 | ||
1274 | /* All good. Don't send back the write positive ret value. */ | |
1275 | ret = 0; | |
1276 | error: | |
1277 | return ret; | |
1278 | } | |
1279 | ||
099e26bd DG |
1280 | /* |
1281 | * Dispatch request from the registration threads to the application | |
1282 | * communication thread. | |
1283 | */ | |
1284 | static void *thread_dispatch_ust_registration(void *data) | |
1285 | { | |
1286 | int ret; | |
1287 | struct cds_wfq_node *node; | |
1288 | struct ust_command *ust_cmd = NULL; | |
d0b96690 DG |
1289 | struct { |
1290 | struct ust_app *app; | |
1291 | struct cds_list_head head; | |
d88aee68 | 1292 | } *wait_node = NULL, *tmp_wait_node; |
d0b96690 DG |
1293 | |
1294 | CDS_LIST_HEAD(wait_queue); | |
099e26bd DG |
1295 | |
1296 | DBG("[thread] Dispatch UST command started"); | |
1297 | ||
26c9d55e | 1298 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
099e26bd DG |
1299 | /* Atomically prepare the queue futex */ |
1300 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1301 | ||
1302 | do { | |
d0b96690 | 1303 | struct ust_app *app = NULL; |
7972aab2 | 1304 | ust_cmd = NULL; |
d0b96690 | 1305 | |
099e26bd DG |
1306 | /* Dequeue command for registration */ |
1307 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1308 | if (node == NULL) { | |
00a17c97 | 1309 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1310 | /* Continue thread execution */ |
1311 | break; | |
1312 | } | |
1313 | ||
1314 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1315 | ||
2f50c8a3 DG |
1316 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1317 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1318 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1319 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1320 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1321 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1322 | |
1323 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1324 | wait_node = zmalloc(sizeof(*wait_node)); | |
1325 | if (!wait_node) { | |
1326 | PERROR("zmalloc wait_node dispatch"); | |
7972aab2 | 1327 | free(ust_cmd); |
d0b96690 DG |
1328 | goto error; |
1329 | } | |
1330 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1331 | ||
1332 | /* Create application object if socket is CMD. */ | |
1333 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1334 | ust_cmd->sock); | |
1335 | if (!wait_node->app) { | |
1336 | ret = close(ust_cmd->sock); | |
1337 | if (ret < 0) { | |
1338 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1339 | } |
d88aee68 DG |
1340 | lttng_fd_put(1, LTTNG_FD_APPS); |
1341 | free(wait_node); | |
7972aab2 | 1342 | free(ust_cmd); |
d0b96690 DG |
1343 | continue; |
1344 | } | |
1345 | /* | |
1346 | * Add application to the wait queue so we can set the notify | |
1347 | * socket before putting this object in the global ht. | |
1348 | */ | |
1349 | cds_list_add(&wait_node->head, &wait_queue); | |
1350 | ||
7972aab2 | 1351 | free(ust_cmd); |
d0b96690 DG |
1352 | /* |
1353 | * We have to continue here since we don't have the notify | |
1354 | * socket and the application MUST be added to the hash table | |
1355 | * only at that moment. | |
1356 | */ | |
1357 | continue; | |
1358 | } else { | |
1359 | /* | |
1360 | * Look for the application in the local wait queue and set the | |
1361 | * notify socket if found. | |
1362 | */ | |
d88aee68 DG |
1363 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1364 | &wait_queue, head) { | |
d0b96690 DG |
1365 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1366 | wait_node->app->notify_sock = ust_cmd->sock; | |
1367 | cds_list_del(&wait_node->head); | |
1368 | app = wait_node->app; | |
1369 | free(wait_node); | |
1370 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1371 | break; | |
1372 | } | |
1373 | } | |
7972aab2 | 1374 | free(ust_cmd); |
d0b96690 DG |
1375 | } |
1376 | ||
1377 | if (app) { | |
d0b96690 DG |
1378 | /* |
1379 | * @session_lock_list | |
1380 | * | |
1381 | * Lock the global session list so from the register up to the | |
1382 | * registration done message, no thread can see the application | |
1383 | * and change its state. | |
1384 | */ | |
1385 | session_lock_list(); | |
1386 | rcu_read_lock(); | |
d88aee68 | 1387 | |
d0b96690 DG |
1388 | /* |
1389 | * Add application to the global hash table. This needs to be | |
1390 | * done before the update to the UST registry can locate the | |
1391 | * application. | |
1392 | */ | |
1393 | ust_app_add(app); | |
d88aee68 DG |
1394 | |
1395 | /* Set app version. This call will print an error if needed. */ | |
1396 | (void) ust_app_version(app); | |
1397 | ||
1398 | /* Send notify socket through the notify pipe. */ | |
1399 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1400 | app->notify_sock); | |
1401 | if (ret < 0) { | |
1402 | rcu_read_unlock(); | |
1403 | session_unlock_list(); | |
1404 | /* No notify thread, stop the UST tracing. */ | |
1405 | goto error; | |
6620da75 | 1406 | } |
d88aee68 | 1407 | |
d0b96690 DG |
1408 | /* |
1409 | * Update newly registered application with the tracing | |
1410 | * registry info already enabled information. | |
1411 | */ | |
1412 | update_ust_app(app->sock); | |
d88aee68 DG |
1413 | |
1414 | /* | |
1415 | * Don't care about return value. Let the manage apps threads | |
1416 | * handle app unregistration upon socket close. | |
1417 | */ | |
1418 | (void) ust_app_register_done(app->sock); | |
1419 | ||
1420 | /* | |
1421 | * Even if the application socket has been closed, send the app | |
1422 | * to the thread and unregistration will take place at that | |
1423 | * place. | |
1424 | */ | |
1425 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1426 | if (ret < 0) { |
d88aee68 DG |
1427 | rcu_read_unlock(); |
1428 | session_unlock_list(); | |
1429 | /* No apps. thread, stop the UST tracing. */ | |
1430 | goto error; | |
d0b96690 | 1431 | } |
d88aee68 | 1432 | |
d0b96690 DG |
1433 | rcu_read_unlock(); |
1434 | session_unlock_list(); | |
6620da75 | 1435 | } else { |
d0b96690 | 1436 | /* Application manager threads are not available. */ |
6620da75 DG |
1437 | ret = close(ust_cmd->sock); |
1438 | if (ret < 0) { | |
1439 | PERROR("close ust_cmd sock"); | |
099e26bd | 1440 | } |
d88aee68 | 1441 | lttng_fd_put(1, LTTNG_FD_APPS); |
099e26bd | 1442 | } |
099e26bd DG |
1443 | } while (node != NULL); |
1444 | ||
1445 | /* Futex wait on queue. Blocking call on futex() */ | |
1446 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1447 | } | |
1448 | ||
1449 | error: | |
d88aee68 DG |
1450 | /* Clean up wait queue. */ |
1451 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1452 | &wait_queue, head) { | |
1453 | cds_list_del(&wait_node->head); | |
1454 | free(wait_node); | |
1455 | } | |
1456 | ||
099e26bd DG |
1457 | DBG("Dispatch thread dying"); |
1458 | return NULL; | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * This thread manage application registration. | |
1463 | */ | |
1464 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1465 | { |
139ac872 | 1466 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1467 | uint32_t revents, nb_fd; |
1468 | struct lttng_poll_event events; | |
099e26bd DG |
1469 | /* |
1470 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1471 | * freed in the manage apps thread. | |
1472 | */ | |
1473 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1474 | |
099e26bd | 1475 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1476 | |
927ca06a DG |
1477 | health_register(HEALTH_TYPE_APP_REG); |
1478 | ||
6993eeb3 CB |
1479 | if (testpoint(thread_registration_apps)) { |
1480 | goto error_testpoint; | |
1481 | } | |
8ac94142 | 1482 | |
1d4b027a DG |
1483 | ret = lttcomm_listen_unix_sock(apps_sock); |
1484 | if (ret < 0) { | |
76d7553f | 1485 | goto error_listen; |
1d4b027a DG |
1486 | } |
1487 | ||
5eb91c98 DG |
1488 | /* |
1489 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1490 | * more will be added to this poll set. | |
1491 | */ | |
d0b96690 | 1492 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1493 | if (ret < 0) { |
76d7553f | 1494 | goto error_create_poll; |
5eb91c98 | 1495 | } |
273ea72c | 1496 | |
5eb91c98 DG |
1497 | /* Add the application registration socket */ |
1498 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1499 | if (ret < 0) { | |
76d7553f | 1500 | goto error_poll_add; |
5eb91c98 | 1501 | } |
273ea72c | 1502 | |
1d4b027a | 1503 | /* Notify all applications to register */ |
0fdd1e2c DG |
1504 | ret = notify_ust_apps(1); |
1505 | if (ret < 0) { | |
1506 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1507 | "Execution continues but there might be problem for already\n" |
1508 | "running applications that wishes to register."); | |
0fdd1e2c | 1509 | } |
1d4b027a DG |
1510 | |
1511 | while (1) { | |
1512 | DBG("Accepting application registration"); | |
273ea72c DG |
1513 | |
1514 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1515 | restart: |
a78af745 | 1516 | health_poll_entry(); |
5eb91c98 | 1517 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1518 | health_poll_exit(); |
273ea72c | 1519 | if (ret < 0) { |
88f2b785 MD |
1520 | /* |
1521 | * Restart interrupted system call. | |
1522 | */ | |
1523 | if (errno == EINTR) { | |
1524 | goto restart; | |
1525 | } | |
273ea72c DG |
1526 | goto error; |
1527 | } | |
1528 | ||
0d9c5d77 DG |
1529 | nb_fd = ret; |
1530 | ||
5eb91c98 | 1531 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1532 | health_code_update(); |
139ac872 | 1533 | |
5eb91c98 DG |
1534 | /* Fetch once the poll data */ |
1535 | revents = LTTNG_POLL_GETEV(&events, i); | |
1536 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1537 | |
5eb91c98 | 1538 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1539 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1540 | if (ret) { |
139ac872 MD |
1541 | err = 0; |
1542 | goto exit; | |
90014c57 | 1543 | } |
1d4b027a | 1544 | |
5eb91c98 DG |
1545 | /* Event on the registration socket */ |
1546 | if (pollfd == apps_sock) { | |
1547 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1548 | ERR("Register apps socket poll error"); | |
1549 | goto error; | |
1550 | } else if (revents & LPOLLIN) { | |
1551 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1552 | if (sock < 0) { | |
1553 | goto error; | |
1554 | } | |
099e26bd | 1555 | |
b662582b DG |
1556 | /* |
1557 | * Set the CLOEXEC flag. Return code is useless because | |
1558 | * either way, the show must go on. | |
1559 | */ | |
1560 | (void) utils_set_fd_cloexec(sock); | |
1561 | ||
5eb91c98 | 1562 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1563 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1564 | if (ust_cmd == NULL) { |
76d7553f | 1565 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
1566 | goto error; |
1567 | } | |
1d4b027a | 1568 | |
5eb91c98 DG |
1569 | /* |
1570 | * Using message-based transmissions to ensure we don't | |
1571 | * have to deal with partially received messages. | |
1572 | */ | |
4063050c MD |
1573 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1574 | if (ret < 0) { | |
1575 | ERR("Exhausted file descriptors allowed for applications."); | |
1576 | free(ust_cmd); | |
1577 | ret = close(sock); | |
1578 | if (ret) { | |
1579 | PERROR("close"); | |
1580 | } | |
1581 | sock = -1; | |
1582 | continue; | |
1583 | } | |
d88aee68 | 1584 | |
840cb59c | 1585 | health_code_update(); |
d0b96690 DG |
1586 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
1587 | if (ret < 0) { | |
5eb91c98 | 1588 | free(ust_cmd); |
d0b96690 | 1589 | /* Close socket of the application. */ |
76d7553f MD |
1590 | ret = close(sock); |
1591 | if (ret) { | |
1592 | PERROR("close"); | |
1593 | } | |
4063050c | 1594 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 1595 | sock = -1; |
5eb91c98 DG |
1596 | continue; |
1597 | } | |
840cb59c | 1598 | health_code_update(); |
099e26bd | 1599 | |
5eb91c98 | 1600 | ust_cmd->sock = sock; |
34a2494f | 1601 | sock = -1; |
099e26bd | 1602 | |
5eb91c98 DG |
1603 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1604 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1605 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1606 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1607 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1608 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1609 | |
5eb91c98 DG |
1610 | /* |
1611 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1612 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1613 | */ |
1614 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1615 | ||
1616 | /* | |
1617 | * Wake the registration queue futex. Implicit memory | |
1618 | * barrier with the exchange in cds_wfq_enqueue. | |
1619 | */ | |
1620 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1621 | } | |
1622 | } | |
90014c57 | 1623 | } |
1d4b027a DG |
1624 | } |
1625 | ||
139ac872 | 1626 | exit: |
1d4b027a | 1627 | error: |
139ac872 | 1628 | if (err) { |
840cb59c | 1629 | health_error(); |
139ac872 MD |
1630 | ERR("Health error occurred in %s", __func__); |
1631 | } | |
139ac872 | 1632 | |
0fdd1e2c DG |
1633 | /* Notify that the registration thread is gone */ |
1634 | notify_ust_apps(0); | |
1635 | ||
a4b35e07 | 1636 | if (apps_sock >= 0) { |
76d7553f MD |
1637 | ret = close(apps_sock); |
1638 | if (ret) { | |
1639 | PERROR("close"); | |
1640 | } | |
a4b35e07 | 1641 | } |
46c3f085 | 1642 | if (sock >= 0) { |
76d7553f MD |
1643 | ret = close(sock); |
1644 | if (ret) { | |
1645 | PERROR("close"); | |
1646 | } | |
4063050c | 1647 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 1648 | } |
273ea72c | 1649 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1650 | |
76d7553f | 1651 | error_poll_add: |
5eb91c98 | 1652 | lttng_poll_clean(&events); |
76d7553f MD |
1653 | error_listen: |
1654 | error_create_poll: | |
6993eeb3 | 1655 | error_testpoint: |
76d7553f | 1656 | DBG("UST Registration thread cleanup complete"); |
927ca06a | 1657 | health_unregister(); |
5eb91c98 | 1658 | |
1d4b027a DG |
1659 | return NULL; |
1660 | } | |
1661 | ||
8c0faa1d | 1662 | /* |
3bd1e081 | 1663 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1664 | * exec or it will fails. |
8c0faa1d | 1665 | */ |
3bd1e081 | 1666 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 1667 | { |
a23ec3a7 | 1668 | int ret, clock_ret; |
ee0b0061 DG |
1669 | struct timespec timeout; |
1670 | ||
a23ec3a7 DG |
1671 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
1672 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 1673 | |
a23ec3a7 DG |
1674 | /* Setup pthread condition */ |
1675 | ret = pthread_condattr_init(&consumer_data->condattr); | |
1676 | if (ret != 0) { | |
1677 | errno = ret; | |
1678 | PERROR("pthread_condattr_init consumer data"); | |
1679 | goto error; | |
1680 | } | |
1681 | ||
1682 | /* | |
1683 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
1684 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
1685 | * for a more details and how we noticed it. | |
1686 | */ | |
1687 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
1688 | if (ret != 0) { | |
1689 | errno = ret; | |
1690 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
1691 | goto error; |
1692 | } | |
8c0faa1d | 1693 | |
a23ec3a7 DG |
1694 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
1695 | if (ret != 0) { | |
1696 | errno = ret; | |
1697 | PERROR("pthread_cond_init consumer data"); | |
1698 | goto error; | |
1699 | } | |
1700 | ||
1701 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
1702 | consumer_data); | |
8c0faa1d | 1703 | if (ret != 0) { |
3bd1e081 | 1704 | PERROR("pthread_create consumer"); |
ee0b0061 | 1705 | ret = -1; |
8c0faa1d DG |
1706 | goto error; |
1707 | } | |
1708 | ||
a23ec3a7 DG |
1709 | /* We are about to wait on a pthread condition */ |
1710 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
1711 | ||
ee0b0061 | 1712 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
1713 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
1714 | /* | |
1715 | * Set the timeout for the condition timed wait even if the clock gettime | |
1716 | * call fails since we might loop on that call and we want to avoid to | |
1717 | * increment the timeout too many times. | |
1718 | */ | |
1719 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
1720 | ||
1721 | /* | |
1722 | * The following loop COULD be skipped in some conditions so this is why we | |
1723 | * set ret to 0 in order to make sure at least one round of the loop is | |
1724 | * done. | |
1725 | */ | |
1726 | ret = 0; | |
1727 | ||
1728 | /* | |
1729 | * Loop until the condition is reached or when a timeout is reached. Note | |
1730 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
1731 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
1732 | * possible. This loop does not take any chances and works with both of | |
1733 | * them. | |
1734 | */ | |
1735 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
1736 | if (clock_ret < 0) { | |
1737 | PERROR("clock_gettime spawn consumer"); | |
1738 | /* Infinite wait for the consumerd thread to be ready */ | |
1739 | ret = pthread_cond_wait(&consumer_data->cond, | |
1740 | &consumer_data->cond_mutex); | |
1741 | } else { | |
1742 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
1743 | &consumer_data->cond_mutex, &timeout); | |
1744 | } | |
ee0b0061 | 1745 | } |
8c0faa1d | 1746 | |
a23ec3a7 DG |
1747 | /* Release the pthread condition */ |
1748 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
1749 | ||
1750 | if (ret != 0) { | |
1751 | errno = ret; | |
1752 | if (ret == ETIMEDOUT) { | |
ee0b0061 DG |
1753 | /* |
1754 | * Call has timed out so we kill the kconsumerd_thread and return | |
1755 | * an error. | |
1756 | */ | |
a23ec3a7 DG |
1757 | ERR("Condition timed out. The consumer thread was never ready." |
1758 | " Killing it"); | |
3bd1e081 | 1759 | ret = pthread_cancel(consumer_data->thread); |
ee0b0061 | 1760 | if (ret < 0) { |
3bd1e081 | 1761 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1762 | } |
1763 | } else { | |
a23ec3a7 | 1764 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 DG |
1765 | } |
1766 | goto error; | |
1767 | } | |
1768 | ||
3bd1e081 MD |
1769 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1770 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 1771 | ERR("Consumerd did not start"); |
3bd1e081 | 1772 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1773 | goto error; |
1774 | } | |
3bd1e081 | 1775 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1776 | |
8c0faa1d DG |
1777 | return 0; |
1778 | ||
1779 | error: | |
1780 | return ret; | |
1781 | } | |
1782 | ||
d9800920 | 1783 | /* |
3bd1e081 | 1784 | * Join consumer thread |
d9800920 | 1785 | */ |
3bd1e081 | 1786 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1787 | { |
1788 | void *status; | |
cf3af59e | 1789 | |
e8209f6b DG |
1790 | /* Consumer pid must be a real one. */ |
1791 | if (consumer_data->pid > 0) { | |
c617c0c6 | 1792 | int ret; |
3bd1e081 | 1793 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 1794 | if (ret) { |
3bd1e081 | 1795 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1796 | return ret; |
1797 | } | |
3bd1e081 | 1798 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1799 | } else { |
1800 | return 0; | |
1801 | } | |
1802 | } | |
1803 | ||
8c0faa1d | 1804 | /* |
3bd1e081 | 1805 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1806 | * |
d063d709 | 1807 | * Return pid if successful else -1. |
8c0faa1d | 1808 | */ |
3bd1e081 | 1809 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1810 | { |
1811 | int ret; | |
1812 | pid_t pid; | |
94c55f17 | 1813 | const char *consumer_to_use; |
53086306 | 1814 | const char *verbosity; |
94c55f17 | 1815 | struct stat st; |
8c0faa1d | 1816 | |
3bd1e081 | 1817 | DBG("Spawning consumerd"); |
c49dc785 | 1818 | |
8c0faa1d DG |
1819 | pid = fork(); |
1820 | if (pid == 0) { | |
1821 | /* | |
3bd1e081 | 1822 | * Exec consumerd. |
8c0faa1d | 1823 | */ |
daee5345 | 1824 | if (opt_verbose_consumer) { |
53086306 DG |
1825 | verbosity = "--verbose"; |
1826 | } else { | |
1827 | verbosity = "--quiet"; | |
1828 | } | |
3bd1e081 MD |
1829 | switch (consumer_data->type) { |
1830 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1831 | /* |
c7704d57 DG |
1832 | * Find out which consumerd to execute. We will first try the |
1833 | * 64-bit path, then the sessiond's installation directory, and | |
1834 | * fallback on the 32-bit one, | |
94c55f17 | 1835 | */ |
63a799e8 AM |
1836 | DBG3("Looking for a kernel consumer at these locations:"); |
1837 | DBG3(" 1) %s", consumerd64_bin); | |
1838 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
1839 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 1840 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 1841 | DBG3("Found location #1"); |
94c55f17 | 1842 | consumer_to_use = consumerd64_bin; |
94c55f17 | 1843 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 1844 | DBG3("Found location #2"); |
94c55f17 | 1845 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 1846 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 1847 | DBG3("Found location #3"); |
eb1e0bd4 | 1848 | consumer_to_use = consumerd32_bin; |
94c55f17 | 1849 | } else { |
63a799e8 | 1850 | DBG("Could not find any valid consumerd executable"); |
94c55f17 AM |
1851 | break; |
1852 | } | |
1853 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1854 | execl(consumer_to_use, | |
1855 | "lttng-consumerd", verbosity, "-k", | |
1856 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1857 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1858 | NULL); | |
3bd1e081 | 1859 | break; |
7753dea8 MD |
1860 | case LTTNG_CONSUMER64_UST: |
1861 | { | |
b1e0b6b6 | 1862 | char *tmpnew = NULL; |
8f4905da MD |
1863 | |
1864 | if (consumerd64_libdir[0] != '\0') { | |
1865 | char *tmp; | |
1866 | size_t tmplen; | |
1867 | ||
1868 | tmp = getenv("LD_LIBRARY_PATH"); | |
1869 | if (!tmp) { | |
1870 | tmp = ""; | |
1871 | } | |
1872 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1873 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1874 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1875 | if (!tmpnew) { | |
1876 | ret = -ENOMEM; | |
1877 | goto error; | |
1878 | } | |
1879 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1880 | strcat(tmpnew, consumerd64_libdir); | |
1881 | if (tmp[0] != '\0') { | |
1882 | strcat(tmpnew, ":"); | |
1883 | strcat(tmpnew, tmp); | |
1884 | } | |
1885 | ret = putenv(tmpnew); | |
1886 | if (ret) { | |
1887 | ret = -errno; | |
c6f76da9 | 1888 | free(tmpnew); |
8f4905da MD |
1889 | goto error; |
1890 | } | |
1891 | } | |
94c55f17 | 1892 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1893 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1894 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1895 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1896 | NULL); | |
8f4905da MD |
1897 | if (consumerd64_libdir[0] != '\0') { |
1898 | free(tmpnew); | |
1899 | } | |
1900 | if (ret) { | |
1901 | goto error; | |
1902 | } | |
3bd1e081 | 1903 | break; |
7753dea8 MD |
1904 | } |
1905 | case LTTNG_CONSUMER32_UST: | |
1906 | { | |
937dde8e | 1907 | char *tmpnew = NULL; |
8f4905da MD |
1908 | |
1909 | if (consumerd32_libdir[0] != '\0') { | |
1910 | char *tmp; | |
1911 | size_t tmplen; | |
1912 | ||
1913 | tmp = getenv("LD_LIBRARY_PATH"); | |
1914 | if (!tmp) { | |
1915 | tmp = ""; | |
1916 | } | |
1917 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1918 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1919 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1920 | if (!tmpnew) { | |
1921 | ret = -ENOMEM; | |
1922 | goto error; | |
1923 | } | |
1924 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1925 | strcat(tmpnew, consumerd32_libdir); | |
1926 | if (tmp[0] != '\0') { | |
1927 | strcat(tmpnew, ":"); | |
1928 | strcat(tmpnew, tmp); | |
1929 | } | |
1930 | ret = putenv(tmpnew); | |
1931 | if (ret) { | |
1932 | ret = -errno; | |
c6f76da9 | 1933 | free(tmpnew); |
8f4905da MD |
1934 | goto error; |
1935 | } | |
1936 | } | |
94c55f17 | 1937 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1938 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1939 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1940 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1941 | NULL); | |
8f4905da MD |
1942 | if (consumerd32_libdir[0] != '\0') { |
1943 | free(tmpnew); | |
1944 | } | |
1945 | if (ret) { | |
1946 | goto error; | |
1947 | } | |
7753dea8 MD |
1948 | break; |
1949 | } | |
3bd1e081 | 1950 | default: |
76d7553f | 1951 | PERROR("unknown consumer type"); |
3bd1e081 MD |
1952 | exit(EXIT_FAILURE); |
1953 | } | |
8c0faa1d | 1954 | if (errno != 0) { |
76d7553f | 1955 | PERROR("kernel start consumer exec"); |
8c0faa1d DG |
1956 | } |
1957 | exit(EXIT_FAILURE); | |
1958 | } else if (pid > 0) { | |
1959 | ret = pid; | |
8c0faa1d | 1960 | } else { |
76d7553f | 1961 | PERROR("start consumer fork"); |
8c0faa1d | 1962 | ret = -errno; |
8c0faa1d | 1963 | } |
8f4905da | 1964 | error: |
8c0faa1d DG |
1965 | return ret; |
1966 | } | |
1967 | ||
693bd40b | 1968 | /* |
3bd1e081 | 1969 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1970 | */ |
3bd1e081 | 1971 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 1972 | { |
c617c0c6 | 1973 | int ret; |
edb8b045 DG |
1974 | |
1975 | /* | |
1976 | * Set the listen() state on the socket since there is a possible race | |
1977 | * between the exec() of the consumer daemon and this call if place in the | |
1978 | * consumer thread. See bug #366 for more details. | |
1979 | */ | |
1980 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
1981 | if (ret < 0) { | |
1982 | goto error; | |
1983 | } | |
693bd40b | 1984 | |
3bd1e081 MD |
1985 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1986 | if (consumer_data->pid != 0) { | |
1987 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1988 | goto end; |
1989 | } | |
693bd40b | 1990 | |
3bd1e081 | 1991 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1992 | if (ret < 0) { |
3bd1e081 MD |
1993 | ERR("Spawning consumerd failed"); |
1994 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1995 | goto error; |
693bd40b | 1996 | } |
c49dc785 | 1997 | |
3bd1e081 MD |
1998 | /* Setting up the consumer_data pid */ |
1999 | consumer_data->pid = ret; | |
48842b30 | 2000 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2001 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2002 | |
3bd1e081 MD |
2003 | DBG2("Spawning consumer control thread"); |
2004 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2005 | if (ret < 0) { |
3bd1e081 | 2006 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2007 | goto error; |
2008 | } | |
2009 | ||
c49dc785 | 2010 | end: |
693bd40b DG |
2011 | return 0; |
2012 | ||
2013 | error: | |
edb8b045 DG |
2014 | /* Cleanup already created socket on error. */ |
2015 | if (consumer_data->err_sock >= 0) { | |
c617c0c6 MD |
2016 | int err; |
2017 | ||
edb8b045 DG |
2018 | err = close(consumer_data->err_sock); |
2019 | if (err < 0) { | |
2020 | PERROR("close consumer data error socket"); | |
2021 | } | |
2022 | } | |
693bd40b DG |
2023 | return ret; |
2024 | } | |
2025 | ||
44a5e5eb | 2026 | /* |
139ac872 MD |
2027 | * Compute health status of each consumer. If one of them is zero (bad |
2028 | * state), we return 0. | |
44a5e5eb DG |
2029 | */ |
2030 | static int check_consumer_health(void) | |
2031 | { | |
2032 | int ret; | |
2033 | ||
927ca06a | 2034 | ret = health_check_state(HEALTH_TYPE_CONSUMER); |
44a5e5eb DG |
2035 | |
2036 | DBG3("Health consumer check %d", ret); | |
2037 | ||
2038 | return ret; | |
2039 | } | |
2040 | ||
b73401da | 2041 | /* |
096102bd | 2042 | * Setup necessary data for kernel tracer action. |
b73401da | 2043 | */ |
096102bd | 2044 | static int init_kernel_tracer(void) |
b73401da DG |
2045 | { |
2046 | int ret; | |
b73401da | 2047 | |
096102bd DG |
2048 | /* Modprobe lttng kernel modules */ |
2049 | ret = modprobe_lttng_control(); | |
b73401da | 2050 | if (ret < 0) { |
b73401da DG |
2051 | goto error; |
2052 | } | |
2053 | ||
096102bd DG |
2054 | /* Open debugfs lttng */ |
2055 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2056 | if (kernel_tracer_fd < 0) { | |
2057 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2058 | ret = -1; |
2059 | goto error_open; | |
54d01ffb DG |
2060 | } |
2061 | ||
2f77fc4b DG |
2062 | /* Validate kernel version */ |
2063 | ret = kernel_validate_version(kernel_tracer_fd); | |
2064 | if (ret < 0) { | |
2065 | goto error_version; | |
b551a063 | 2066 | } |
54d01ffb | 2067 | |
2f77fc4b DG |
2068 | ret = modprobe_lttng_data(); |
2069 | if (ret < 0) { | |
2070 | goto error_modules; | |
54d01ffb DG |
2071 | } |
2072 | ||
2f77fc4b DG |
2073 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2074 | return 0; | |
2075 | ||
2076 | error_version: | |
2077 | modprobe_remove_lttng_control(); | |
2078 | ret = close(kernel_tracer_fd); | |
2079 | if (ret) { | |
2080 | PERROR("close"); | |
b551a063 | 2081 | } |
2f77fc4b | 2082 | kernel_tracer_fd = -1; |
f73fabfd | 2083 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2084 | |
2f77fc4b DG |
2085 | error_modules: |
2086 | ret = close(kernel_tracer_fd); | |
2087 | if (ret) { | |
2088 | PERROR("close"); | |
b551a063 | 2089 | } |
54d01ffb | 2090 | |
2f77fc4b DG |
2091 | error_open: |
2092 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2093 | |
2094 | error: | |
2f77fc4b DG |
2095 | WARN("No kernel tracer available"); |
2096 | kernel_tracer_fd = -1; | |
2097 | if (!is_root) { | |
f73fabfd | 2098 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2099 | } else { |
f73fabfd | 2100 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2101 | } |
54d01ffb DG |
2102 | } |
2103 | ||
2f77fc4b | 2104 | |
54d01ffb | 2105 | /* |
2f77fc4b DG |
2106 | * Copy consumer output from the tracing session to the domain session. The |
2107 | * function also applies the right modification on a per domain basis for the | |
2108 | * trace files destination directory. | |
54d01ffb | 2109 | */ |
2f77fc4b | 2110 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2111 | { |
2112 | int ret; | |
2f77fc4b DG |
2113 | const char *dir_name; |
2114 | struct consumer_output *consumer; | |
2115 | ||
2116 | assert(session); | |
2117 | assert(session->consumer); | |
54d01ffb | 2118 | |
b551a063 DG |
2119 | switch (domain) { |
2120 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2121 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2122 | /* |
2123 | * XXX: We should audit the session creation and what this function | |
2124 | * does "extra" in order to avoid a destroy since this function is used | |
2125 | * in the domain session creation (kernel and ust) only. Same for UST | |
2126 | * domain. | |
2127 | */ | |
2128 | if (session->kernel_session->consumer) { | |
2129 | consumer_destroy_output(session->kernel_session->consumer); | |
2130 | } | |
2f77fc4b DG |
2131 | session->kernel_session->consumer = |
2132 | consumer_copy_output(session->consumer); | |
2133 | /* Ease our life a bit for the next part */ | |
2134 | consumer = session->kernel_session->consumer; | |
2135 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 DG |
2136 | break; |
2137 | case LTTNG_DOMAIN_UST: | |
2f77fc4b | 2138 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2139 | if (session->ust_session->consumer) { |
2140 | consumer_destroy_output(session->ust_session->consumer); | |
2141 | } | |
2f77fc4b DG |
2142 | session->ust_session->consumer = |
2143 | consumer_copy_output(session->consumer); | |
2144 | /* Ease our life a bit for the next part */ | |
2145 | consumer = session->ust_session->consumer; | |
2146 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2147 | break; |
2148 | default: | |
f73fabfd | 2149 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2150 | goto error; |
2151 | } | |
2152 | ||
2f77fc4b | 2153 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2154 | strncat(consumer->subdir, dir_name, |
2155 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2156 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2157 | ||
f73fabfd | 2158 | ret = LTTNG_OK; |
54d01ffb DG |
2159 | |
2160 | error: | |
2161 | return ret; | |
2162 | } | |
2163 | ||
00e2e675 | 2164 | /* |
2f77fc4b | 2165 | * Create an UST session and add it to the session ust list. |
00e2e675 | 2166 | */ |
2f77fc4b DG |
2167 | static int create_ust_session(struct ltt_session *session, |
2168 | struct lttng_domain *domain) | |
00e2e675 DG |
2169 | { |
2170 | int ret; | |
2f77fc4b | 2171 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2172 | |
a4b92340 | 2173 | assert(session); |
2f77fc4b DG |
2174 | assert(domain); |
2175 | assert(session->consumer); | |
a4b92340 | 2176 | |
2f77fc4b DG |
2177 | switch (domain->type) { |
2178 | case LTTNG_DOMAIN_UST: | |
2179 | break; | |
2180 | default: | |
2181 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2182 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2183 | goto error; |
2184 | } | |
2185 | ||
2f77fc4b DG |
2186 | DBG("Creating UST session"); |
2187 | ||
fdd9eb17 | 2188 | lus = trace_ust_create_session(session->path, session->id); |
2f77fc4b | 2189 | if (lus == NULL) { |
f73fabfd | 2190 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2191 | goto error; |
2192 | } | |
2193 | ||
2f77fc4b DG |
2194 | lus->uid = session->uid; |
2195 | lus->gid = session->gid; | |
2196 | session->ust_session = lus; | |
00e2e675 | 2197 | |
2f77fc4b DG |
2198 | /* Copy session output to the newly created UST session */ |
2199 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2200 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2201 | goto error; |
2202 | } | |
2203 | ||
f73fabfd | 2204 | return LTTNG_OK; |
00e2e675 DG |
2205 | |
2206 | error: | |
2f77fc4b DG |
2207 | free(lus); |
2208 | session->ust_session = NULL; | |
00e2e675 DG |
2209 | return ret; |
2210 | } | |
2211 | ||
2212 | /* | |
2f77fc4b | 2213 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2214 | */ |
2f77fc4b | 2215 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2216 | { |
2217 | int ret; | |
a4b92340 | 2218 | |
2f77fc4b | 2219 | DBG("Creating kernel session"); |
00e2e675 | 2220 | |
2f77fc4b DG |
2221 | ret = kernel_create_session(session, kernel_tracer_fd); |
2222 | if (ret < 0) { | |
f73fabfd | 2223 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2224 | goto error; |
2225 | } | |
2226 | ||
2f77fc4b DG |
2227 | /* Code flow safety */ |
2228 | assert(session->kernel_session); | |
2229 | ||
2230 | /* Copy session output to the newly created Kernel session */ | |
2231 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2232 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2233 | goto error; |
2234 | } | |
2235 | ||
2f77fc4b DG |
2236 | /* Create directory(ies) on local filesystem. */ |
2237 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2238 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2239 | ret = run_as_mkdir_recursive( | |
2240 | session->kernel_session->consumer->dst.trace_path, | |
2241 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2242 | if (ret < 0) { | |
2243 | if (ret != -EEXIST) { | |
2244 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2245 | goto error; |
2246 | } | |
00e2e675 | 2247 | } |
2f77fc4b | 2248 | } |
00e2e675 | 2249 | |
2f77fc4b DG |
2250 | session->kernel_session->uid = session->uid; |
2251 | session->kernel_session->gid = session->gid; | |
00e2e675 | 2252 | |
f73fabfd | 2253 | return LTTNG_OK; |
00e2e675 | 2254 | |
2f77fc4b DG |
2255 | error: |
2256 | trace_kernel_destroy_session(session->kernel_session); | |
2257 | session->kernel_session = NULL; | |
2258 | return ret; | |
2259 | } | |
00e2e675 | 2260 | |
2f77fc4b DG |
2261 | /* |
2262 | * Count number of session permitted by uid/gid. | |
2263 | */ | |
2264 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2265 | { | |
2266 | unsigned int i = 0; | |
2267 | struct ltt_session *session; | |
07424f16 | 2268 | |
2f77fc4b DG |
2269 | DBG("Counting number of available session for UID %d GID %d", |
2270 | uid, gid); | |
2271 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2272 | /* |
2f77fc4b | 2273 | * Only list the sessions the user can control. |
00e2e675 | 2274 | */ |
2f77fc4b DG |
2275 | if (!session_access_ok(session, uid, gid)) { |
2276 | continue; | |
2277 | } | |
2278 | i++; | |
a4b92340 | 2279 | } |
2f77fc4b | 2280 | return i; |
00e2e675 DG |
2281 | } |
2282 | ||
54d01ffb DG |
2283 | /* |
2284 | * Process the command requested by the lttng client within the command | |
2285 | * context structure. This function make sure that the return structure (llm) | |
2286 | * is set and ready for transmission before returning. | |
2287 | * | |
2288 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2289 | * |
2290 | * "sock" is only used for special-case var. len data. | |
54d01ffb | 2291 | */ |
53a80697 MD |
2292 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2293 | int *sock_error) | |
54d01ffb | 2294 | { |
f73fabfd | 2295 | int ret = LTTNG_OK; |
44d3bd01 | 2296 | int need_tracing_session = 1; |
2e09ba09 | 2297 | int need_domain; |
54d01ffb DG |
2298 | |
2299 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2300 | ||
53a80697 MD |
2301 | *sock_error = 0; |
2302 | ||
2e09ba09 MD |
2303 | switch (cmd_ctx->lsm->cmd_type) { |
2304 | case LTTNG_CREATE_SESSION: | |
2305 | case LTTNG_DESTROY_SESSION: | |
2306 | case LTTNG_LIST_SESSIONS: | |
2307 | case LTTNG_LIST_DOMAINS: | |
2308 | case LTTNG_START_TRACE: | |
2309 | case LTTNG_STOP_TRACE: | |
6d805429 | 2310 | case LTTNG_DATA_PENDING: |
2e09ba09 | 2311 | need_domain = 0; |
3aace903 | 2312 | break; |
2e09ba09 MD |
2313 | default: |
2314 | need_domain = 1; | |
2315 | } | |
2316 | ||
2317 | if (opt_no_kernel && need_domain | |
2318 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2319 | if (!is_root) { |
f73fabfd | 2320 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2321 | } else { |
f73fabfd | 2322 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2323 | } |
4fba7219 DG |
2324 | goto error; |
2325 | } | |
2326 | ||
8d3113b2 DG |
2327 | /* Deny register consumer if we already have a spawned consumer. */ |
2328 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2329 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2330 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2331 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2332 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2333 | goto error; |
2334 | } | |
2335 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2336 | } | |
2337 | ||
54d01ffb DG |
2338 | /* |
2339 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2340 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2341 | * command. |
2342 | */ | |
2343 | switch(cmd_ctx->lsm->cmd_type) { | |
2344 | case LTTNG_LIST_SESSIONS: | |
2345 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2346 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2347 | case LTTNG_LIST_DOMAINS: |
2348 | case LTTNG_LIST_CHANNELS: | |
2349 | case LTTNG_LIST_EVENTS: | |
2350 | break; | |
2351 | default: | |
2352 | /* Setup lttng message with no payload */ | |
2353 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2354 | if (ret < 0) { | |
2355 | /* This label does not try to unlock the session */ | |
2356 | goto init_setup_error; | |
2357 | } | |
2358 | } | |
2359 | ||
2360 | /* Commands that DO NOT need a session. */ | |
2361 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2362 | case LTTNG_CREATE_SESSION: |
2e09ba09 | 2363 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2364 | case LTTNG_LIST_SESSIONS: |
2365 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2366 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
44d3bd01 | 2367 | need_tracing_session = 0; |
54d01ffb DG |
2368 | break; |
2369 | default: | |
2370 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2371 | /* |
2372 | * We keep the session list lock across _all_ commands | |
2373 | * for now, because the per-session lock does not | |
2374 | * handle teardown properly. | |
2375 | */ | |
74babd95 | 2376 | session_lock_list(); |
54d01ffb DG |
2377 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2378 | if (cmd_ctx->session == NULL) { | |
2379 | if (cmd_ctx->lsm->session.name != NULL) { | |
f73fabfd | 2380 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2381 | } else { |
2382 | /* If no session name specified */ | |
f73fabfd | 2383 | ret = LTTNG_ERR_SELECT_SESS; |
54d01ffb DG |
2384 | } |
2385 | goto error; | |
2386 | } else { | |
2387 | /* Acquire lock for the session */ | |
2388 | session_lock(cmd_ctx->session); | |
2389 | } | |
2390 | break; | |
2391 | } | |
b389abbe | 2392 | |
2e09ba09 MD |
2393 | if (!need_domain) { |
2394 | goto skip_domain; | |
2395 | } | |
a4b92340 | 2396 | |
54d01ffb DG |
2397 | /* |
2398 | * Check domain type for specific "pre-action". | |
2399 | */ | |
2400 | switch (cmd_ctx->lsm->domain.type) { | |
2401 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 2402 | if (!is_root) { |
f73fabfd | 2403 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
2404 | goto error; |
2405 | } | |
2406 | ||
54d01ffb | 2407 | /* Kernel tracer check */ |
a4b35e07 | 2408 | if (kernel_tracer_fd == -1) { |
54d01ffb | 2409 | /* Basically, load kernel tracer modules */ |
096102bd DG |
2410 | ret = init_kernel_tracer(); |
2411 | if (ret != 0) { | |
54d01ffb DG |
2412 | goto error; |
2413 | } | |
2414 | } | |
5eb91c98 | 2415 | |
5c827ce0 DG |
2416 | /* Consumer is in an ERROR state. Report back to client */ |
2417 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2418 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2419 | goto error; |
2420 | } | |
2421 | ||
54d01ffb | 2422 | /* Need a session for kernel command */ |
44d3bd01 | 2423 | if (need_tracing_session) { |
54d01ffb | 2424 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 2425 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 2426 | if (ret < 0) { |
f73fabfd | 2427 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
2428 | goto error; |
2429 | } | |
b389abbe | 2430 | } |
7d29a247 | 2431 | |
54d01ffb | 2432 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
2433 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
2434 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 2435 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
2436 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
2437 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 2438 | if (ret < 0) { |
f73fabfd | 2439 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 2440 | goto error; |
950131af | 2441 | } |
5c827ce0 | 2442 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
2443 | } else { |
2444 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 2445 | } |
173af62f | 2446 | |
a4b92340 DG |
2447 | /* |
2448 | * The consumer was just spawned so we need to add the socket to | |
2449 | * the consumer output of the session if exist. | |
2450 | */ | |
2451 | ret = consumer_create_socket(&kconsumer_data, | |
2452 | cmd_ctx->session->kernel_session->consumer); | |
2453 | if (ret < 0) { | |
2454 | goto error; | |
173af62f | 2455 | } |
0d0c377a | 2456 | } |
5c827ce0 | 2457 | |
54d01ffb | 2458 | break; |
2bdd86d4 | 2459 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 2460 | { |
5c827ce0 DG |
2461 | /* Consumer is in an ERROR state. Report back to client */ |
2462 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 2463 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2464 | goto error; |
2465 | } | |
2466 | ||
44d3bd01 | 2467 | if (need_tracing_session) { |
a4b92340 | 2468 | /* Create UST session if none exist. */ |
f6a9efaa | 2469 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 2470 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 2471 | &cmd_ctx->lsm->domain); |
f73fabfd | 2472 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
2473 | goto error; |
2474 | } | |
2475 | } | |
00e2e675 | 2476 | |
7753dea8 MD |
2477 | /* Start the UST consumer daemons */ |
2478 | /* 64-bit */ | |
2479 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 2480 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 2481 | ustconsumer64_data.pid == 0 && |
785d2d0d | 2482 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2483 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2484 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 2485 | if (ret < 0) { |
f73fabfd | 2486 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 2487 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
2488 | goto error; |
2489 | } | |
48842b30 | 2490 | |
173af62f | 2491 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 2492 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 2493 | } else { |
7753dea8 MD |
2494 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
2495 | } | |
173af62f DG |
2496 | |
2497 | /* | |
2498 | * Setup socket for consumer 64 bit. No need for atomic access | |
2499 | * since it was set above and can ONLY be set in this thread. | |
2500 | */ | |
a4b92340 DG |
2501 | ret = consumer_create_socket(&ustconsumer64_data, |
2502 | cmd_ctx->session->ust_session->consumer); | |
2503 | if (ret < 0) { | |
2504 | goto error; | |
173af62f DG |
2505 | } |
2506 | ||
7753dea8 | 2507 | /* 32-bit */ |
fc7a59ce | 2508 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 2509 | ustconsumer32_data.pid == 0 && |
785d2d0d | 2510 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
2511 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
2512 | ret = start_consumerd(&ustconsumer32_data); | |
2513 | if (ret < 0) { | |
f73fabfd | 2514 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 2515 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
2516 | goto error; |
2517 | } | |
5c827ce0 | 2518 | |
173af62f | 2519 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 2520 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
2521 | } else { |
2522 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 2523 | } |
173af62f DG |
2524 | |
2525 | /* | |
2526 | * Setup socket for consumer 64 bit. No need for atomic access | |
2527 | * since it was set above and can ONLY be set in this thread. | |
2528 | */ | |
a4b92340 DG |
2529 | ret = consumer_create_socket(&ustconsumer32_data, |
2530 | cmd_ctx->session->ust_session->consumer); | |
2531 | if (ret < 0) { | |
2532 | goto error; | |
173af62f | 2533 | } |
44d3bd01 DG |
2534 | } |
2535 | break; | |
48842b30 | 2536 | } |
54d01ffb | 2537 | default: |
54d01ffb DG |
2538 | break; |
2539 | } | |
2e09ba09 | 2540 | skip_domain: |
33a2b854 | 2541 | |
5c827ce0 DG |
2542 | /* Validate consumer daemon state when start/stop trace command */ |
2543 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
2544 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
2545 | switch (cmd_ctx->lsm->domain.type) { | |
2546 | case LTTNG_DOMAIN_UST: | |
2547 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2548 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
2549 | goto error; |
2550 | } | |
2551 | break; | |
2552 | case LTTNG_DOMAIN_KERNEL: | |
2553 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 2554 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
2555 | goto error; |
2556 | } | |
2557 | break; | |
2558 | } | |
2559 | } | |
2560 | ||
8e0af1b4 MD |
2561 | /* |
2562 | * Check that the UID or GID match that of the tracing session. | |
2563 | * The root user can interact with all sessions. | |
2564 | */ | |
2565 | if (need_tracing_session) { | |
2566 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
2567 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2568 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 2569 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
2570 | goto error; |
2571 | } | |
2572 | } | |
2573 | ||
ffe60014 DG |
2574 | /* |
2575 | * Send relayd information to consumer as soon as we have a domain and a | |
2576 | * session defined. | |
2577 | */ | |
2578 | if (cmd_ctx->session && need_domain) { | |
2579 | /* | |
2580 | * Setup relayd if not done yet. If the relayd information was already | |
2581 | * sent to the consumer, this call will gracefully return. | |
2582 | */ | |
2583 | ret = cmd_setup_relayd(cmd_ctx->session); | |
2584 | if (ret != LTTNG_OK) { | |
2585 | goto error; | |
2586 | } | |
2587 | } | |
2588 | ||
54d01ffb DG |
2589 | /* Process by command type */ |
2590 | switch (cmd_ctx->lsm->cmd_type) { | |
2591 | case LTTNG_ADD_CONTEXT: | |
2592 | { | |
2593 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2594 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 2595 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
2596 | break; |
2597 | } | |
2598 | case LTTNG_DISABLE_CHANNEL: | |
2599 | { | |
2600 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2601 | cmd_ctx->lsm->u.disable.channel_name); | |
2602 | break; | |
2603 | } | |
2604 | case LTTNG_DISABLE_EVENT: | |
2605 | { | |
2606 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2607 | cmd_ctx->lsm->u.disable.channel_name, | |
2608 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
2609 | break; |
2610 | } | |
54d01ffb DG |
2611 | case LTTNG_DISABLE_ALL_EVENT: |
2612 | { | |
2bdd86d4 | 2613 | DBG("Disabling all events"); |
54d01ffb DG |
2614 | |
2615 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
2616 | cmd_ctx->lsm->u.disable.channel_name); | |
2617 | break; | |
2618 | } | |
2619 | case LTTNG_ENABLE_CHANNEL: | |
2620 | { | |
7972aab2 | 2621 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 2622 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
2623 | break; |
2624 | } | |
2625 | case LTTNG_ENABLE_EVENT: | |
2626 | { | |
7972aab2 | 2627 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
54d01ffb | 2628 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2629 | &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2630 | break; |
2631 | } | |
2632 | case LTTNG_ENABLE_ALL_EVENT: | |
2633 | { | |
2bdd86d4 | 2634 | DBG("Enabling all events"); |
54d01ffb | 2635 | |
7972aab2 | 2636 | ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain, |
8c9ae521 | 2637 | cmd_ctx->lsm->u.enable.channel_name, |
025faf73 | 2638 | cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]); |
54d01ffb DG |
2639 | break; |
2640 | } | |
052da939 | 2641 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2642 | { |
9f19cc17 | 2643 | struct lttng_event *events; |
54d01ffb | 2644 | ssize_t nb_events; |
052da939 | 2645 | |
54d01ffb DG |
2646 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
2647 | if (nb_events < 0) { | |
f73fabfd | 2648 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2649 | ret = -nb_events; |
2650 | goto error; | |
2ef84c95 DG |
2651 | } |
2652 | ||
2653 | /* | |
2654 | * Setup lttng message with payload size set to the event list size in | |
2655 | * bytes and then copy list into the llm payload. | |
2656 | */ | |
052da939 | 2657 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2658 | if (ret < 0) { |
052da939 | 2659 | free(events); |
2ef84c95 DG |
2660 | goto setup_error; |
2661 | } | |
2662 | ||
2663 | /* Copy event list into message payload */ | |
9f19cc17 | 2664 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2665 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2666 | |
9f19cc17 | 2667 | free(events); |
2ef84c95 | 2668 | |
f73fabfd | 2669 | ret = LTTNG_OK; |
2ef84c95 DG |
2670 | break; |
2671 | } | |
f37d259d MD |
2672 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
2673 | { | |
2674 | struct lttng_event_field *fields; | |
2675 | ssize_t nb_fields; | |
2676 | ||
a4b92340 DG |
2677 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
2678 | &fields); | |
f37d259d | 2679 | if (nb_fields < 0) { |
f73fabfd | 2680 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
2681 | ret = -nb_fields; |
2682 | goto error; | |
2683 | } | |
2684 | ||
2685 | /* | |
2686 | * Setup lttng message with payload size set to the event list size in | |
2687 | * bytes and then copy list into the llm payload. | |
2688 | */ | |
a4b92340 DG |
2689 | ret = setup_lttng_msg(cmd_ctx, |
2690 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
2691 | if (ret < 0) { |
2692 | free(fields); | |
2693 | goto setup_error; | |
2694 | } | |
2695 | ||
2696 | /* Copy event list into message payload */ | |
2697 | memcpy(cmd_ctx->llm->payload, fields, | |
2698 | sizeof(struct lttng_event_field) * nb_fields); | |
2699 | ||
2700 | free(fields); | |
2701 | ||
f73fabfd | 2702 | ret = LTTNG_OK; |
f37d259d MD |
2703 | break; |
2704 | } | |
00e2e675 DG |
2705 | case LTTNG_SET_CONSUMER_URI: |
2706 | { | |
a4b92340 DG |
2707 | size_t nb_uri, len; |
2708 | struct lttng_uri *uris; | |
2709 | ||
2710 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2711 | len = nb_uri * sizeof(struct lttng_uri); | |
2712 | ||
2713 | if (nb_uri == 0) { | |
f73fabfd | 2714 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
2715 | goto error; |
2716 | } | |
2717 | ||
2718 | uris = zmalloc(len); | |
2719 | if (uris == NULL) { | |
f73fabfd | 2720 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2721 | goto error; |
2722 | } | |
2723 | ||
2724 | /* Receive variable len data */ | |
77c7c900 | 2725 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
2726 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2727 | if (ret <= 0) { | |
2728 | DBG("No URIs received from client... continuing"); | |
2729 | *sock_error = 1; | |
f73fabfd | 2730 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2731 | free(uris); |
a4b92340 DG |
2732 | goto error; |
2733 | } | |
2734 | ||
00e2e675 | 2735 | ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
a4b92340 | 2736 | nb_uri, uris); |
f73fabfd | 2737 | if (ret != LTTNG_OK) { |
b1d41407 | 2738 | free(uris); |
a4b92340 DG |
2739 | goto error; |
2740 | } | |
2741 | ||
2742 | /* | |
2743 | * XXX: 0 means that this URI should be applied on the session. Should | |
2744 | * be a DOMAIN enuam. | |
2745 | */ | |
2746 | if (cmd_ctx->lsm->domain.type == 0) { | |
2747 | /* Add the URI for the UST session if a consumer is present. */ | |
2748 | if (cmd_ctx->session->ust_session && | |
2749 | cmd_ctx->session->ust_session->consumer) { | |
2750 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session, | |
2751 | nb_uri, uris); | |
2752 | } else if (cmd_ctx->session->kernel_session && | |
2753 | cmd_ctx->session->kernel_session->consumer) { | |
2754 | ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL, | |
2755 | cmd_ctx->session, nb_uri, uris); | |
2756 | } | |
2757 | } | |
2758 | ||
b1d41407 DG |
2759 | free(uris); |
2760 | ||
00e2e675 DG |
2761 | break; |
2762 | } | |
f3ed775e | 2763 | case LTTNG_START_TRACE: |
8c0faa1d | 2764 | { |
54d01ffb | 2765 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
2766 | break; |
2767 | } | |
f3ed775e | 2768 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2769 | { |
54d01ffb | 2770 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
2771 | break; |
2772 | } | |
5e16da05 MD |
2773 | case LTTNG_CREATE_SESSION: |
2774 | { | |
a4b92340 DG |
2775 | size_t nb_uri, len; |
2776 | struct lttng_uri *uris = NULL; | |
2777 | ||
2778 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
2779 | len = nb_uri * sizeof(struct lttng_uri); | |
2780 | ||
2781 | if (nb_uri > 0) { | |
2782 | uris = zmalloc(len); | |
2783 | if (uris == NULL) { | |
f73fabfd | 2784 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
2785 | goto error; |
2786 | } | |
2787 | ||
2788 | /* Receive variable len data */ | |
77c7c900 | 2789 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
2790 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
2791 | if (ret <= 0) { | |
2792 | DBG("No URIs received from client... continuing"); | |
2793 | *sock_error = 1; | |
f73fabfd | 2794 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2795 | free(uris); |
a4b92340 DG |
2796 | goto error; |
2797 | } | |
2798 | ||
2799 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
2800 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 2801 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 2802 | free(uris); |
a4b92340 DG |
2803 | goto error; |
2804 | } | |
2805 | } | |
2806 | ||
2807 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
2808 | &cmd_ctx->creds); | |
2809 | ||
b1d41407 DG |
2810 | free(uris); |
2811 | ||
00e2e675 DG |
2812 | break; |
2813 | } | |
5e16da05 MD |
2814 | case LTTNG_DESTROY_SESSION: |
2815 | { | |
2f77fc4b | 2816 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
2817 | |
2818 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 2819 | cmd_ctx->session = NULL; |
5461b305 | 2820 | break; |
5e16da05 | 2821 | } |
9f19cc17 | 2822 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2823 | { |
54d01ffb DG |
2824 | ssize_t nb_dom; |
2825 | struct lttng_domain *domains; | |
5461b305 | 2826 | |
54d01ffb DG |
2827 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
2828 | if (nb_dom < 0) { | |
f73fabfd | 2829 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2830 | ret = -nb_dom; |
2831 | goto error; | |
ce3d728c | 2832 | } |
520ff687 | 2833 | |
54d01ffb | 2834 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
2835 | if (ret < 0) { |
2836 | goto setup_error; | |
520ff687 | 2837 | } |
57167058 | 2838 | |
54d01ffb DG |
2839 | /* Copy event list into message payload */ |
2840 | memcpy(cmd_ctx->llm->payload, domains, | |
2841 | nb_dom * sizeof(struct lttng_domain)); | |
2842 | ||
2843 | free(domains); | |
5e16da05 | 2844 | |
f73fabfd | 2845 | ret = LTTNG_OK; |
5e16da05 MD |
2846 | break; |
2847 | } | |
9f19cc17 | 2848 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2849 | { |
6775595e | 2850 | int nb_chan; |
54d01ffb DG |
2851 | struct lttng_channel *channels; |
2852 | ||
b551a063 DG |
2853 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
2854 | cmd_ctx->session, &channels); | |
54d01ffb | 2855 | if (nb_chan < 0) { |
f73fabfd | 2856 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2857 | ret = -nb_chan; |
2858 | goto error; | |
5461b305 | 2859 | } |
ca95a216 | 2860 | |
54d01ffb | 2861 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
2862 | if (ret < 0) { |
2863 | goto setup_error; | |
2864 | } | |
9f19cc17 | 2865 | |
54d01ffb DG |
2866 | /* Copy event list into message payload */ |
2867 | memcpy(cmd_ctx->llm->payload, channels, | |
2868 | nb_chan * sizeof(struct lttng_channel)); | |
2869 | ||
2870 | free(channels); | |
9f19cc17 | 2871 | |
f73fabfd | 2872 | ret = LTTNG_OK; |
5461b305 | 2873 | break; |
5e16da05 | 2874 | } |
9f19cc17 | 2875 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2876 | { |
b551a063 | 2877 | ssize_t nb_event; |
684d34d2 | 2878 | struct lttng_event *events = NULL; |
9f19cc17 | 2879 | |
b551a063 | 2880 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
2881 | cmd_ctx->lsm->u.list.channel_name, &events); |
2882 | if (nb_event < 0) { | |
f73fabfd | 2883 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
2884 | ret = -nb_event; |
2885 | goto error; | |
5461b305 | 2886 | } |
ca95a216 | 2887 | |
54d01ffb | 2888 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
2889 | if (ret < 0) { |
2890 | goto setup_error; | |
2891 | } | |
9f19cc17 | 2892 | |
54d01ffb DG |
2893 | /* Copy event list into message payload */ |
2894 | memcpy(cmd_ctx->llm->payload, events, | |
2895 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 2896 | |
54d01ffb | 2897 | free(events); |
9f19cc17 | 2898 | |
f73fabfd | 2899 | ret = LTTNG_OK; |
5461b305 | 2900 | break; |
5e16da05 MD |
2901 | } |
2902 | case LTTNG_LIST_SESSIONS: | |
2903 | { | |
8e0af1b4 | 2904 | unsigned int nr_sessions; |
5461b305 | 2905 | |
8e0af1b4 | 2906 | session_lock_list(); |
730389d9 DG |
2907 | nr_sessions = lttng_sessions_count( |
2908 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
2909 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 2910 | |
8e0af1b4 | 2911 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 2912 | if (ret < 0) { |
54d01ffb | 2913 | session_unlock_list(); |
5461b305 | 2914 | goto setup_error; |
e065084a | 2915 | } |
5e16da05 | 2916 | |
6c9cc2ab | 2917 | /* Filled the session array */ |
2f77fc4b | 2918 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
2919 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
2920 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 2921 | |
54d01ffb | 2922 | session_unlock_list(); |
5e16da05 | 2923 | |
f73fabfd | 2924 | ret = LTTNG_OK; |
5e16da05 MD |
2925 | break; |
2926 | } | |
d0254c7c MD |
2927 | case LTTNG_CALIBRATE: |
2928 | { | |
54d01ffb DG |
2929 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
2930 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
2931 | break; |
2932 | } | |
d9800920 DG |
2933 | case LTTNG_REGISTER_CONSUMER: |
2934 | { | |
2f77fc4b DG |
2935 | struct consumer_data *cdata; |
2936 | ||
2937 | switch (cmd_ctx->lsm->domain.type) { | |
2938 | case LTTNG_DOMAIN_KERNEL: | |
2939 | cdata = &kconsumer_data; | |
2940 | break; | |
2941 | default: | |
f73fabfd | 2942 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
2943 | goto error; |
2944 | } | |
2945 | ||
54d01ffb | 2946 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 2947 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
2948 | break; |
2949 | } | |
025faf73 | 2950 | case LTTNG_ENABLE_EVENT_WITH_FILTER: |
53a80697 MD |
2951 | { |
2952 | struct lttng_filter_bytecode *bytecode; | |
2953 | ||
025faf73 | 2954 | if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) { |
f73fabfd | 2955 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2956 | goto error; |
2957 | } | |
52df2401 MD |
2958 | if (cmd_ctx->lsm->u.enable.bytecode_len == 0) { |
2959 | ret = LTTNG_ERR_FILTER_INVAL; | |
2960 | goto error; | |
2961 | } | |
025faf73 | 2962 | bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 | 2963 | if (!bytecode) { |
f73fabfd | 2964 | ret = LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
2965 | goto error; |
2966 | } | |
2967 | /* Receive var. len. data */ | |
2968 | DBG("Receiving var len data from client ..."); | |
2969 | ret = lttcomm_recv_unix_sock(sock, bytecode, | |
025faf73 | 2970 | cmd_ctx->lsm->u.enable.bytecode_len); |
53a80697 MD |
2971 | if (ret <= 0) { |
2972 | DBG("Nothing recv() from client var len data... continuing"); | |
2973 | *sock_error = 1; | |
f73fabfd | 2974 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2975 | goto error; |
2976 | } | |
2977 | ||
2978 | if (bytecode->len + sizeof(*bytecode) | |
025faf73 | 2979 | != cmd_ctx->lsm->u.enable.bytecode_len) { |
53a80697 | 2980 | free(bytecode); |
f73fabfd | 2981 | ret = LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
2982 | goto error; |
2983 | } | |
2984 | ||
7972aab2 | 2985 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
025faf73 DG |
2986 | cmd_ctx->lsm->u.enable.channel_name, |
2987 | &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]); | |
53a80697 MD |
2988 | break; |
2989 | } | |
6d805429 | 2990 | case LTTNG_DATA_PENDING: |
806e2684 | 2991 | { |
6d805429 | 2992 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
2993 | break; |
2994 | } | |
5e16da05 | 2995 | default: |
f73fabfd | 2996 | ret = LTTNG_ERR_UND; |
5461b305 | 2997 | break; |
fac6795d DG |
2998 | } |
2999 | ||
5461b305 | 3000 | error: |
5461b305 DG |
3001 | if (cmd_ctx->llm == NULL) { |
3002 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3003 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3004 | goto setup_error; |
3005 | } | |
3006 | } | |
54d01ffb | 3007 | /* Set return code */ |
5461b305 | 3008 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3009 | setup_error: |
b5541356 | 3010 | if (cmd_ctx->session) { |
54d01ffb | 3011 | session_unlock(cmd_ctx->session); |
b5541356 | 3012 | } |
256a5576 MD |
3013 | if (need_tracing_session) { |
3014 | session_unlock_list(); | |
3015 | } | |
54d01ffb | 3016 | init_setup_error: |
8028d920 | 3017 | return ret; |
fac6795d DG |
3018 | } |
3019 | ||
44a5e5eb DG |
3020 | /* |
3021 | * Thread managing health check socket. | |
3022 | */ | |
3023 | static void *thread_manage_health(void *data) | |
3024 | { | |
eb4a2943 | 3025 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3026 | uint32_t revents, nb_fd; |
3027 | struct lttng_poll_event events; | |
3028 | struct lttcomm_health_msg msg; | |
3029 | struct lttcomm_health_data reply; | |
3030 | ||
3031 | DBG("[thread] Manage health check started"); | |
3032 | ||
3033 | rcu_register_thread(); | |
3034 | ||
3035 | /* Create unix socket */ | |
3036 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3037 | if (sock < 0) { | |
3038 | ERR("Unable to create health check Unix socket"); | |
3039 | ret = -1; | |
3040 | goto error; | |
3041 | } | |
3042 | ||
b662582b DG |
3043 | /* |
3044 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3045 | * show must go on. | |
3046 | */ | |
3047 | (void) utils_set_fd_cloexec(sock); | |
3048 | ||
44a5e5eb DG |
3049 | ret = lttcomm_listen_unix_sock(sock); |
3050 | if (ret < 0) { | |
3051 | goto error; | |
3052 | } | |
3053 | ||
3054 | /* | |
3055 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3056 | * more will be added to this poll set. | |
3057 | */ | |
d0b96690 | 3058 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
3059 | if (ret < 0) { |
3060 | goto error; | |
3061 | } | |
3062 | ||
3063 | /* Add the application registration socket */ | |
3064 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
3065 | if (ret < 0) { | |
3066 | goto error; | |
3067 | } | |
3068 | ||
3069 | while (1) { | |
3070 | DBG("Health check ready"); | |
3071 | ||
44a5e5eb DG |
3072 | /* Inifinite blocking call, waiting for transmission */ |
3073 | restart: | |
3074 | ret = lttng_poll_wait(&events, -1); | |
3075 | if (ret < 0) { | |
3076 | /* | |
3077 | * Restart interrupted system call. | |
3078 | */ | |
3079 | if (errno == EINTR) { | |
3080 | goto restart; | |
3081 | } | |
3082 | goto error; | |
3083 | } | |
3084 | ||
0d9c5d77 DG |
3085 | nb_fd = ret; |
3086 | ||
44a5e5eb DG |
3087 | for (i = 0; i < nb_fd; i++) { |
3088 | /* Fetch once the poll data */ | |
3089 | revents = LTTNG_POLL_GETEV(&events, i); | |
3090 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3091 | ||
3092 | /* Thread quit pipe has been closed. Killing thread. */ | |
d0b96690 | 3093 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 3094 | if (ret) { |
139ac872 MD |
3095 | err = 0; |
3096 | goto exit; | |
44a5e5eb DG |
3097 | } |
3098 | ||
3099 | /* Event on the registration socket */ | |
3100 | if (pollfd == sock) { | |
3101 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3102 | ERR("Health socket poll error"); | |
3103 | goto error; | |
3104 | } | |
3105 | } | |
3106 | } | |
3107 | ||
3108 | new_sock = lttcomm_accept_unix_sock(sock); | |
3109 | if (new_sock < 0) { | |
3110 | goto error; | |
3111 | } | |
3112 | ||
b662582b DG |
3113 | /* |
3114 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3115 | * show must go on. | |
3116 | */ | |
3117 | (void) utils_set_fd_cloexec(new_sock); | |
3118 | ||
44a5e5eb DG |
3119 | DBG("Receiving data from client for health..."); |
3120 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
3121 | if (ret <= 0) { | |
3122 | DBG("Nothing recv() from client... continuing"); | |
3123 | ret = close(new_sock); | |
3124 | if (ret) { | |
3125 | PERROR("close"); | |
3126 | } | |
3127 | new_sock = -1; | |
3128 | continue; | |
3129 | } | |
3130 | ||
3131 | rcu_thread_online(); | |
3132 | ||
3133 | switch (msg.component) { | |
3134 | case LTTNG_HEALTH_CMD: | |
927ca06a | 3135 | reply.ret_code = health_check_state(HEALTH_TYPE_CMD); |
44a5e5eb | 3136 | break; |
139ac872 | 3137 | case LTTNG_HEALTH_APP_MANAGE: |
927ca06a | 3138 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE); |
139ac872 | 3139 | break; |
44a5e5eb | 3140 | case LTTNG_HEALTH_APP_REG: |
927ca06a | 3141 | reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG); |
44a5e5eb DG |
3142 | break; |
3143 | case LTTNG_HEALTH_KERNEL: | |
927ca06a | 3144 | reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL); |
44a5e5eb DG |
3145 | break; |
3146 | case LTTNG_HEALTH_CONSUMER: | |
3147 | reply.ret_code = check_consumer_health(); | |
3148 | break; | |
3149 | case LTTNG_HEALTH_ALL: | |
44a5e5eb | 3150 | reply.ret_code = |
927ca06a DG |
3151 | health_check_state(HEALTH_TYPE_APP_MANAGE) && |
3152 | health_check_state(HEALTH_TYPE_APP_REG) && | |
3153 | health_check_state(HEALTH_TYPE_CMD) && | |
3154 | health_check_state(HEALTH_TYPE_KERNEL) && | |
139ac872 | 3155 | check_consumer_health(); |
44a5e5eb DG |
3156 | break; |
3157 | default: | |
f73fabfd | 3158 | reply.ret_code = LTTNG_ERR_UND; |
44a5e5eb DG |
3159 | break; |
3160 | } | |
3161 | ||
3162 | /* | |
3163 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
3164 | * the client where in the sessiond it is the opposite. Again, this is | |
3165 | * just to make things easier for us poor developer which enjoy a lot | |
3166 | * lazyness. | |
3167 | */ | |
3168 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
3169 | reply.ret_code = !reply.ret_code; | |
3170 | } | |
3171 | ||
3172 | DBG2("Health check return value %d", reply.ret_code); | |
3173 | ||
3174 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
3175 | if (ret < 0) { | |
3176 | ERR("Failed to send health data back to client"); | |
3177 | } | |
3178 | ||
3179 | /* End of transmission */ | |
3180 | ret = close(new_sock); | |
3181 | if (ret) { | |
3182 | PERROR("close"); | |
3183 | } | |
3184 | new_sock = -1; | |
3185 | } | |
3186 | ||
139ac872 | 3187 | exit: |
44a5e5eb | 3188 | error: |
139ac872 MD |
3189 | if (err) { |
3190 | ERR("Health error occurred in %s", __func__); | |
3191 | } | |
44a5e5eb DG |
3192 | DBG("Health check thread dying"); |
3193 | unlink(health_unix_sock_path); | |
3194 | if (sock >= 0) { | |
3195 | ret = close(sock); | |
3196 | if (ret) { | |
3197 | PERROR("close"); | |
3198 | } | |
3199 | } | |
3200 | if (new_sock >= 0) { | |
3201 | ret = close(new_sock); | |
3202 | if (ret) { | |
3203 | PERROR("close"); | |
3204 | } | |
3205 | } | |
3206 | ||
3207 | lttng_poll_clean(&events); | |
3208 | ||
3209 | rcu_unregister_thread(); | |
3210 | return NULL; | |
3211 | } | |
3212 | ||
1d4b027a | 3213 | /* |
d063d709 DG |
3214 | * This thread manage all clients request using the unix client socket for |
3215 | * communication. | |
1d4b027a DG |
3216 | */ |
3217 | static void *thread_manage_clients(void *data) | |
3218 | { | |
139ac872 | 3219 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 3220 | int sock_error; |
5eb91c98 | 3221 | uint32_t revents, nb_fd; |
273ea72c | 3222 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3223 | struct lttng_poll_event events; |
1d4b027a DG |
3224 | |
3225 | DBG("[thread] Manage client started"); | |
3226 | ||
f6a9efaa DG |
3227 | rcu_register_thread(); |
3228 | ||
927ca06a DG |
3229 | health_register(HEALTH_TYPE_CMD); |
3230 | ||
6993eeb3 CB |
3231 | if (testpoint(thread_manage_clients)) { |
3232 | goto error_testpoint; | |
3233 | } | |
3234 | ||
840cb59c | 3235 | health_code_update(); |
44a5e5eb | 3236 | |
1d4b027a DG |
3237 | ret = lttcomm_listen_unix_sock(client_sock); |
3238 | if (ret < 0) { | |
35df2755 | 3239 | goto error_listen; |
1d4b027a DG |
3240 | } |
3241 | ||
5eb91c98 DG |
3242 | /* |
3243 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3244 | * more will be added to this poll set. | |
3245 | */ | |
d0b96690 | 3246 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 3247 | if (ret < 0) { |
35df2755 | 3248 | goto error_create_poll; |
5eb91c98 | 3249 | } |
273ea72c | 3250 | |
5eb91c98 DG |
3251 | /* Add the application registration socket */ |
3252 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3253 | if (ret < 0) { | |
3254 | goto error; | |
3255 | } | |
273ea72c | 3256 | |
bbd973c2 DG |
3257 | /* |
3258 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3259 | */ |
3260 | if (opt_sig_parent) { | |
8db8d1dc | 3261 | kill(ppid, SIGUSR1); |
1d4b027a DG |
3262 | } |
3263 | ||
6993eeb3 CB |
3264 | if (testpoint(thread_manage_clients_before_loop)) { |
3265 | goto error; | |
3266 | } | |
8ac94142 | 3267 | |
840cb59c | 3268 | health_code_update(); |
44a5e5eb | 3269 | |
1d4b027a | 3270 | while (1) { |
1d4b027a | 3271 | DBG("Accepting client command ..."); |
273ea72c DG |
3272 | |
3273 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 3274 | restart: |
a78af745 | 3275 | health_poll_entry(); |
5eb91c98 | 3276 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 3277 | health_poll_exit(); |
273ea72c | 3278 | if (ret < 0) { |
88f2b785 MD |
3279 | /* |
3280 | * Restart interrupted system call. | |
3281 | */ | |
3282 | if (errno == EINTR) { | |
3283 | goto restart; | |
3284 | } | |
273ea72c DG |
3285 | goto error; |
3286 | } | |
3287 | ||
0d9c5d77 DG |
3288 | nb_fd = ret; |
3289 | ||
5eb91c98 DG |
3290 | for (i = 0; i < nb_fd; i++) { |
3291 | /* Fetch once the poll data */ | |
3292 | revents = LTTNG_POLL_GETEV(&events, i); | |
3293 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3294 | ||
840cb59c | 3295 | health_code_update(); |
44a5e5eb | 3296 | |
5eb91c98 | 3297 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 3298 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 3299 | if (ret) { |
139ac872 MD |
3300 | err = 0; |
3301 | goto exit; | |
5eb91c98 DG |
3302 | } |
3303 | ||
3304 | /* Event on the registration socket */ | |
3305 | if (pollfd == client_sock) { | |
3306 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3307 | ERR("Client socket poll error"); | |
3308 | goto error; | |
3309 | } | |
3310 | } | |
3311 | } | |
3312 | ||
3313 | DBG("Wait for client response"); | |
3314 | ||
840cb59c | 3315 | health_code_update(); |
44a5e5eb | 3316 | |
5eb91c98 DG |
3317 | sock = lttcomm_accept_unix_sock(client_sock); |
3318 | if (sock < 0) { | |
273ea72c | 3319 | goto error; |
273ea72c DG |
3320 | } |
3321 | ||
b662582b DG |
3322 | /* |
3323 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3324 | * show must go on. | |
3325 | */ | |
3326 | (void) utils_set_fd_cloexec(sock); | |
3327 | ||
be040666 DG |
3328 | /* Set socket option for credentials retrieval */ |
3329 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3330 | if (ret < 0) { | |
3331 | goto error; | |
3332 | } | |
3333 | ||
5eb91c98 | 3334 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3335 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3336 | if (cmd_ctx == NULL) { |
76d7553f | 3337 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 3338 | goto error; |
5eb91c98 | 3339 | } |
1d4b027a | 3340 | |
5eb91c98 | 3341 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3342 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3343 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 3344 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3345 | goto error; |
3346 | } | |
1d4b027a | 3347 | |
5eb91c98 DG |
3348 | cmd_ctx->llm = NULL; |
3349 | cmd_ctx->session = NULL; | |
1d4b027a | 3350 | |
840cb59c | 3351 | health_code_update(); |
44a5e5eb | 3352 | |
5eb91c98 DG |
3353 | /* |
3354 | * Data is received from the lttng client. The struct | |
3355 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3356 | * the client. | |
3357 | */ | |
3358 | DBG("Receiving data from client ..."); | |
be040666 DG |
3359 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3360 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3361 | if (ret <= 0) { |
3362 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
3363 | ret = close(sock); |
3364 | if (ret) { | |
3365 | PERROR("close"); | |
3366 | } | |
3367 | sock = -1; | |
a2c0da86 | 3368 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3369 | continue; |
3370 | } | |
1d4b027a | 3371 | |
840cb59c | 3372 | health_code_update(); |
44a5e5eb | 3373 | |
5eb91c98 DG |
3374 | // TODO: Validate cmd_ctx including sanity check for |
3375 | // security purpose. | |
f7776ea7 | 3376 | |
f6a9efaa | 3377 | rcu_thread_online(); |
5eb91c98 DG |
3378 | /* |
3379 | * This function dispatch the work to the kernel or userspace tracer | |
3380 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3381 | * informations for the client. The command context struct contains | |
3382 | * everything this function may needs. | |
3383 | */ | |
53a80697 | 3384 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 3385 | rcu_thread_offline(); |
5eb91c98 | 3386 | if (ret < 0) { |
53a80697 MD |
3387 | if (sock_error) { |
3388 | ret = close(sock); | |
3389 | if (ret) { | |
3390 | PERROR("close"); | |
3391 | } | |
3392 | sock = -1; | |
3393 | } | |
bbd973c2 | 3394 | /* |
5eb91c98 | 3395 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3396 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
3397 | * (ENOMEM). Error detected but still accept |
3398 | * command, unless a socket error has been | |
3399 | * detected. | |
bbd973c2 | 3400 | */ |
bbd973c2 | 3401 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3402 | continue; |
3403 | } | |
d6e4fca4 | 3404 | |
840cb59c | 3405 | health_code_update(); |
44a5e5eb | 3406 | |
54d01ffb DG |
3407 | DBG("Sending response (size: %d, retcode: %s)", |
3408 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3409 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3410 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3411 | if (ret < 0) { |
3412 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3413 | } |
1d4b027a | 3414 | |
5eb91c98 | 3415 | /* End of transmission */ |
76d7553f MD |
3416 | ret = close(sock); |
3417 | if (ret) { | |
3418 | PERROR("close"); | |
3419 | } | |
3420 | sock = -1; | |
be040666 DG |
3421 | |
3422 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 3423 | |
840cb59c | 3424 | health_code_update(); |
273ea72c DG |
3425 | } |
3426 | ||
139ac872 | 3427 | exit: |
5eb91c98 | 3428 | error: |
35df2755 CB |
3429 | if (sock >= 0) { |
3430 | ret = close(sock); | |
3431 | if (ret) { | |
3432 | PERROR("close"); | |
3433 | } | |
139ac872 | 3434 | } |
44a5e5eb | 3435 | |
35df2755 CB |
3436 | lttng_poll_clean(&events); |
3437 | clean_command_ctx(&cmd_ctx); | |
3438 | ||
3439 | error_listen: | |
3440 | error_create_poll: | |
6993eeb3 | 3441 | error_testpoint: |
273ea72c | 3442 | unlink(client_unix_sock_path); |
76d7553f MD |
3443 | if (client_sock >= 0) { |
3444 | ret = close(client_sock); | |
3445 | if (ret) { | |
3446 | PERROR("close"); | |
3447 | } | |
a4b35e07 | 3448 | } |
35df2755 CB |
3449 | |
3450 | if (err) { | |
840cb59c | 3451 | health_error(); |
35df2755 | 3452 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 3453 | } |
273ea72c | 3454 | |
927ca06a | 3455 | health_unregister(); |
35df2755 CB |
3456 | |
3457 | DBG("Client thread dying"); | |
f6a9efaa DG |
3458 | |
3459 | rcu_unregister_thread(); | |
1d4b027a DG |
3460 | return NULL; |
3461 | } | |
3462 | ||
3463 | ||
fac6795d DG |
3464 | /* |
3465 | * usage function on stderr | |
3466 | */ | |
3467 | static void usage(void) | |
3468 | { | |
b716ce68 | 3469 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3470 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3471 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3472 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3473 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3474 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3475 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3476 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3477 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3478 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3479 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3480 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3481 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3482 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3483 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3484 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3485 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3486 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3487 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3488 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 3489 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 3490 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3491 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3492 | } |
3493 | ||
3494 | /* | |
3495 | * daemon argument parsing | |
3496 | */ | |
3497 | static int parse_args(int argc, char **argv) | |
3498 | { | |
3499 | int c; | |
3500 | ||
3501 | static struct option long_options[] = { | |
3502 | { "client-sock", 1, 0, 'c' }, | |
3503 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3504 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3505 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3506 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3507 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3508 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3509 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3510 | { "consumerd32-path", 1, 0, 'u' }, | |
3511 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3512 | { "consumerd64-path", 1, 0, 't' }, | |
3513 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3514 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3515 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3516 | { "help", 0, 0, 'h' }, |
3517 | { "group", 1, 0, 'g' }, | |
3518 | { "version", 0, 0, 'V' }, | |
75462a81 | 3519 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3520 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3521 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3522 | { "no-kernel", 0, 0, 'N' }, |
35f90c40 | 3523 | { "pidfile", 1, 0, 'p' }, |
fac6795d DG |
3524 | { NULL, 0, 0, 0 } |
3525 | }; | |
3526 | ||
3527 | while (1) { | |
3528 | int option_index = 0; | |
35f90c40 | 3529 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:", |
54d01ffb | 3530 | long_options, &option_index); |
fac6795d DG |
3531 | if (c == -1) { |
3532 | break; | |
3533 | } | |
3534 | ||
3535 | switch (c) { | |
3536 | case 0: | |
3537 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3538 | if (optarg) { | |
3539 | fprintf(stderr, " with arg %s\n", optarg); | |
3540 | } | |
3541 | break; | |
b716ce68 | 3542 | case 'c': |
fac6795d DG |
3543 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3544 | break; | |
3545 | case 'a': | |
3546 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3547 | break; | |
3548 | case 'd': | |
3549 | opt_daemon = 1; | |
3550 | break; | |
3551 | case 'g': | |
fb09408a | 3552 | opt_tracing_group = optarg; |
fac6795d DG |
3553 | break; |
3554 | case 'h': | |
3555 | usage(); | |
3556 | exit(EXIT_FAILURE); | |
3557 | case 'V': | |
3558 | fprintf(stdout, "%s\n", VERSION); | |
3559 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3560 | case 'S': |
3561 | opt_sig_parent = 1; | |
3562 | break; | |
d6f42150 | 3563 | case 'E': |
3bd1e081 | 3564 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3565 | break; |
3566 | case 'C': | |
3bd1e081 MD |
3567 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3568 | break; | |
3569 | case 'F': | |
7753dea8 | 3570 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3571 | break; |
3572 | case 'D': | |
7753dea8 MD |
3573 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3574 | break; | |
3575 | case 'H': | |
3576 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3577 | break; | |
3578 | case 'G': | |
3579 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3580 | break; |
4fba7219 DG |
3581 | case 'N': |
3582 | opt_no_kernel = 1; | |
3583 | break; | |
75462a81 | 3584 | case 'q': |
97e19046 | 3585 | lttng_opt_quiet = 1; |
75462a81 | 3586 | break; |
3f9947db | 3587 | case 'v': |
53086306 | 3588 | /* Verbose level can increase using multiple -v */ |
97e19046 | 3589 | lttng_opt_verbose += 1; |
3f9947db | 3590 | break; |
31f73cc9 | 3591 | case 'Z': |
3bd1e081 | 3592 | opt_verbose_consumer += 1; |
31f73cc9 | 3593 | break; |
fb09408a | 3594 | case 'u': |
fc7a59ce | 3595 | consumerd32_bin= optarg; |
ebaeda94 MD |
3596 | break; |
3597 | case 'U': | |
3598 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3599 | break; |
3600 | case 't': | |
fc7a59ce | 3601 | consumerd64_bin = optarg; |
ebaeda94 MD |
3602 | break; |
3603 | case 'T': | |
3604 | consumerd64_libdir = optarg; | |
fb09408a | 3605 | break; |
35f90c40 DG |
3606 | case 'p': |
3607 | opt_pidfile = optarg; | |
3608 | break; | |
fac6795d DG |
3609 | default: |
3610 | /* Unknown option or other error. | |
3611 | * Error is printed by getopt, just return */ | |
3612 | return -1; | |
3613 | } | |
3614 | } | |
3615 | ||
3616 | return 0; | |
3617 | } | |
3618 | ||
3619 | /* | |
d063d709 | 3620 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3621 | * apps_sock - The communication socket for all UST apps. |
3622 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3623 | */ |
cf3af59e | 3624 | static int init_daemon_socket(void) |
fac6795d DG |
3625 | { |
3626 | int ret = 0; | |
3627 | mode_t old_umask; | |
3628 | ||
3629 | old_umask = umask(0); | |
3630 | ||
3631 | /* Create client tool unix socket */ | |
d6f42150 DG |
3632 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3633 | if (client_sock < 0) { | |
3634 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3635 | ret = -1; |
3636 | goto end; | |
3637 | } | |
3638 | ||
b662582b DG |
3639 | /* Set the cloexec flag */ |
3640 | ret = utils_set_fd_cloexec(client_sock); | |
3641 | if (ret < 0) { | |
3642 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
3643 | "Continuing but note that the consumer daemon will have a " | |
3644 | "reference to this socket on exec()", client_sock); | |
3645 | } | |
3646 | ||
fac6795d DG |
3647 | /* File permission MUST be 660 */ |
3648 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3649 | if (ret < 0) { | |
d6f42150 | 3650 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 3651 | PERROR("chmod"); |
fac6795d DG |
3652 | goto end; |
3653 | } | |
3654 | ||
3655 | /* Create the application unix socket */ | |
d6f42150 DG |
3656 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3657 | if (apps_sock < 0) { | |
3658 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3659 | ret = -1; |
3660 | goto end; | |
3661 | } | |
3662 | ||
b662582b DG |
3663 | /* Set the cloexec flag */ |
3664 | ret = utils_set_fd_cloexec(apps_sock); | |
3665 | if (ret < 0) { | |
3666 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
3667 | "Continuing but note that the consumer daemon will have a " | |
3668 | "reference to this socket on exec()", apps_sock); | |
3669 | } | |
3670 | ||
d6f42150 | 3671 | /* File permission MUST be 666 */ |
54d01ffb DG |
3672 | ret = chmod(apps_unix_sock_path, |
3673 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3674 | if (ret < 0) { |
d6f42150 | 3675 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 3676 | PERROR("chmod"); |
fac6795d DG |
3677 | goto end; |
3678 | } | |
3679 | ||
b662582b DG |
3680 | DBG3("Session daemon client socket %d and application socket %d created", |
3681 | client_sock, apps_sock); | |
3682 | ||
fac6795d DG |
3683 | end: |
3684 | umask(old_umask); | |
3685 | return ret; | |
3686 | } | |
3687 | ||
3688 | /* | |
54d01ffb DG |
3689 | * Check if the global socket is available, and if a daemon is answering at the |
3690 | * other side. If yes, error is returned. | |
fac6795d | 3691 | */ |
cf3af59e | 3692 | static int check_existing_daemon(void) |
fac6795d | 3693 | { |
7d8234d9 | 3694 | /* Is there anybody out there ? */ |
099e26bd | 3695 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3696 | return -EEXIST; |
099e26bd | 3697 | } |
b09c7c76 DG |
3698 | |
3699 | return 0; | |
fac6795d DG |
3700 | } |
3701 | ||
fac6795d | 3702 | /* |
d063d709 | 3703 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3704 | * |
d063d709 | 3705 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 3706 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 3707 | */ |
be040666 | 3708 | static int set_permissions(char *rundir) |
fac6795d DG |
3709 | { |
3710 | int ret; | |
996b65c8 | 3711 | gid_t gid; |
fac6795d | 3712 | |
6775595e DG |
3713 | ret = allowed_group(); |
3714 | if (ret < 0) { | |
be040666 DG |
3715 | WARN("No tracing group detected"); |
3716 | ret = 0; | |
fac6795d DG |
3717 | goto end; |
3718 | } | |
3719 | ||
6775595e DG |
3720 | gid = ret; |
3721 | ||
d6f42150 | 3722 | /* Set lttng run dir */ |
be040666 | 3723 | ret = chown(rundir, 0, gid); |
d6f42150 | 3724 | if (ret < 0) { |
be040666 | 3725 | ERR("Unable to set group on %s", rundir); |
76d7553f | 3726 | PERROR("chown"); |
d6f42150 DG |
3727 | } |
3728 | ||
d1613cf5 | 3729 | /* Ensure tracing group can search the run dir */ |
61076f74 | 3730 | ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH); |
d1613cf5 JN |
3731 | if (ret < 0) { |
3732 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 3733 | PERROR("chmod"); |
d1613cf5 JN |
3734 | } |
3735 | ||
d6f42150 | 3736 | /* lttng client socket path */ |
996b65c8 | 3737 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3738 | if (ret < 0) { |
d6f42150 | 3739 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 3740 | PERROR("chown"); |
d6f42150 DG |
3741 | } |
3742 | ||
3bd1e081 MD |
3743 | /* kconsumer error socket path */ |
3744 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3745 | if (ret < 0) { |
3bd1e081 | 3746 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 3747 | PERROR("chown"); |
3bd1e081 MD |
3748 | } |
3749 | ||
7753dea8 MD |
3750 | /* 64-bit ustconsumer error socket path */ |
3751 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3752 | if (ret < 0) { | |
3753 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 3754 | PERROR("chown"); |
7753dea8 MD |
3755 | } |
3756 | ||
3757 | /* 32-bit ustconsumer compat32 error socket path */ | |
3758 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 3759 | if (ret < 0) { |
7753dea8 | 3760 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 3761 | PERROR("chown"); |
fac6795d DG |
3762 | } |
3763 | ||
d6f42150 | 3764 | DBG("All permissions are set"); |
e07ae692 | 3765 | |
fac6795d DG |
3766 | end: |
3767 | return ret; | |
3768 | } | |
3769 | ||
d6f42150 | 3770 | /* |
d063d709 | 3771 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 3772 | */ |
67e40797 | 3773 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
3774 | { |
3775 | int ret; | |
3776 | ||
67e40797 DG |
3777 | DBG3("Creating LTTng run directory: %s", rundir); |
3778 | ||
d1613cf5 | 3779 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 3780 | if (ret < 0) { |
b1f11e69 | 3781 | if (errno != EEXIST) { |
67e40797 | 3782 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
3783 | goto error; |
3784 | } else { | |
3785 | ret = 0; | |
3786 | } | |
d6f42150 DG |
3787 | } |
3788 | ||
3789 | error: | |
3790 | return ret; | |
3791 | } | |
3792 | ||
3793 | /* | |
d063d709 DG |
3794 | * Setup sockets and directory needed by the kconsumerd communication with the |
3795 | * session daemon. | |
d6f42150 | 3796 | */ |
67e40797 DG |
3797 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
3798 | const char *rundir) | |
d6f42150 DG |
3799 | { |
3800 | int ret; | |
67e40797 | 3801 | char path[PATH_MAX]; |
d6f42150 | 3802 | |
67e40797 | 3803 | switch (consumer_data->type) { |
7753dea8 | 3804 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 3805 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
3806 | break; |
3807 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 3808 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
3809 | break; |
3810 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 3811 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
3812 | break; |
3813 | default: | |
3814 | ERR("Consumer type unknown"); | |
3815 | ret = -EINVAL; | |
3816 | goto error; | |
d6f42150 DG |
3817 | } |
3818 | ||
67e40797 DG |
3819 | DBG2("Creating consumer directory: %s", path); |
3820 | ||
d1613cf5 | 3821 | ret = mkdir(path, S_IRWXU); |
d6f42150 | 3822 | if (ret < 0) { |
6beb2242 | 3823 | if (errno != EEXIST) { |
f11e84c2 | 3824 | PERROR("mkdir"); |
3bd1e081 | 3825 | ERR("Failed to create %s", path); |
6beb2242 DG |
3826 | goto error; |
3827 | } | |
f11e84c2 | 3828 | ret = -1; |
d6f42150 DG |
3829 | } |
3830 | ||
3831 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
3832 | consumer_data->err_sock = |
3833 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
3834 | if (consumer_data->err_sock < 0) { | |
3835 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
3836 | ret = -1; |
3837 | goto error; | |
3838 | } | |
3839 | ||
3840 | /* File permission MUST be 660 */ | |
3bd1e081 | 3841 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 3842 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 3843 | if (ret < 0) { |
3bd1e081 | 3844 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 3845 | PERROR("chmod"); |
d6f42150 DG |
3846 | goto error; |
3847 | } | |
3848 | ||
3849 | error: | |
3850 | return ret; | |
3851 | } | |
3852 | ||
fac6795d | 3853 | /* |
d063d709 | 3854 | * Signal handler for the daemon |
cf3af59e | 3855 | * |
54d01ffb DG |
3856 | * Simply stop all worker threads, leaving main() return gracefully after |
3857 | * joining all threads and calling cleanup(). | |
fac6795d DG |
3858 | */ |
3859 | static void sighandler(int sig) | |
3860 | { | |
3861 | switch (sig) { | |
cf3af59e | 3862 | case SIGPIPE: |
af87c45a | 3863 | DBG("SIGPIPE caught"); |
cf3af59e MD |
3864 | return; |
3865 | case SIGINT: | |
af87c45a | 3866 | DBG("SIGINT caught"); |
cf3af59e MD |
3867 | stop_threads(); |
3868 | break; | |
3869 | case SIGTERM: | |
af87c45a | 3870 | DBG("SIGTERM caught"); |
cf3af59e MD |
3871 | stop_threads(); |
3872 | break; | |
3873 | default: | |
3874 | break; | |
fac6795d | 3875 | } |
fac6795d DG |
3876 | } |
3877 | ||
3878 | /* | |
d063d709 | 3879 | * Setup signal handler for : |
1d4b027a | 3880 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3881 | */ |
1d4b027a | 3882 | static int set_signal_handler(void) |
fac6795d | 3883 | { |
1d4b027a DG |
3884 | int ret = 0; |
3885 | struct sigaction sa; | |
3886 | sigset_t sigset; | |
fac6795d | 3887 | |
1d4b027a | 3888 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 3889 | PERROR("sigemptyset"); |
1d4b027a DG |
3890 | return ret; |
3891 | } | |
d6f42150 | 3892 | |
1d4b027a DG |
3893 | sa.sa_handler = sighandler; |
3894 | sa.sa_mask = sigset; | |
3895 | sa.sa_flags = 0; | |
3896 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 3897 | PERROR("sigaction"); |
1d4b027a | 3898 | return ret; |
d6f42150 DG |
3899 | } |
3900 | ||
1d4b027a | 3901 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 3902 | PERROR("sigaction"); |
1d4b027a | 3903 | return ret; |
d6f42150 | 3904 | } |
aaf26714 | 3905 | |
1d4b027a | 3906 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 3907 | PERROR("sigaction"); |
1d4b027a | 3908 | return ret; |
8c0faa1d DG |
3909 | } |
3910 | ||
1d4b027a DG |
3911 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3912 | ||
3913 | return ret; | |
fac6795d DG |
3914 | } |
3915 | ||
f3ed775e | 3916 | /* |
d063d709 DG |
3917 | * Set open files limit to unlimited. This daemon can open a large number of |
3918 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3919 | */ |
3920 | static void set_ulimit(void) | |
3921 | { | |
3922 | int ret; | |
3923 | struct rlimit lim; | |
3924 | ||
a88df331 | 3925 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3926 | lim.rlim_cur = 65535; |
3927 | lim.rlim_max = 65535; | |
3928 | ||
3929 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3930 | if (ret < 0) { | |
76d7553f | 3931 | PERROR("failed to set open files limit"); |
f3ed775e DG |
3932 | } |
3933 | } | |
3934 | ||
35f90c40 DG |
3935 | /* |
3936 | * Write pidfile using the rundir and opt_pidfile. | |
3937 | */ | |
3938 | static void write_pidfile(void) | |
3939 | { | |
3940 | int ret; | |
3941 | char pidfile_path[PATH_MAX]; | |
3942 | ||
3943 | assert(rundir); | |
3944 | ||
3945 | if (opt_pidfile) { | |
3946 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
3947 | } else { | |
3948 | /* Build pidfile path from rundir and opt_pidfile. */ | |
3949 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
3950 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
3951 | if (ret < 0) { | |
3952 | PERROR("snprintf pidfile path"); | |
3953 | goto error; | |
3954 | } | |
3955 | } | |
3956 | ||
3957 | /* | |
3958 | * Create pid file in rundir. Return value is of no importance. The | |
3959 | * execution will continue even though we are not able to write the file. | |
3960 | */ | |
3961 | (void) utils_create_pid_file(getpid(), pidfile_path); | |
3962 | ||
3963 | error: | |
3964 | return; | |
3965 | } | |
3966 | ||
fac6795d DG |
3967 | /* |
3968 | * main | |
3969 | */ | |
3970 | int main(int argc, char **argv) | |
3971 | { | |
fac6795d DG |
3972 | int ret = 0; |
3973 | void *status; | |
ae9e45b3 | 3974 | const char *home_path, *env_app_timeout; |
fac6795d | 3975 | |
335a95b7 MD |
3976 | init_kernel_workarounds(); |
3977 | ||
f6a9efaa DG |
3978 | rcu_register_thread(); |
3979 | ||
7753dea8 | 3980 | setup_consumerd_path(); |
fb09408a | 3981 | |
fac6795d DG |
3982 | /* Parse arguments */ |
3983 | progname = argv[0]; | |
c617c0c6 | 3984 | if ((ret = parse_args(argc, argv)) < 0) { |
cf3af59e | 3985 | goto error; |
fac6795d DG |
3986 | } |
3987 | ||
3988 | /* Daemonize */ | |
3989 | if (opt_daemon) { | |
ceed52b5 MD |
3990 | int i; |
3991 | ||
3992 | /* | |
3993 | * fork | |
3994 | * child: setsid, close FD 0, 1, 2, chdir / | |
3995 | * parent: exit (if fork is successful) | |
3996 | */ | |
53094c05 DG |
3997 | ret = daemon(0, 0); |
3998 | if (ret < 0) { | |
76d7553f | 3999 | PERROR("daemon"); |
cf3af59e | 4000 | goto error; |
53094c05 | 4001 | } |
ceed52b5 MD |
4002 | /* |
4003 | * We are in the child. Make sure all other file | |
4004 | * descriptors are closed, in case we are called with | |
4005 | * more opened file descriptors than the standard ones. | |
4006 | */ | |
4007 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
4008 | (void) close(i); | |
4009 | } | |
4010 | } | |
4011 | ||
4012 | /* Create thread quit pipe */ | |
4013 | if ((ret = init_thread_quit_pipe()) < 0) { | |
4014 | goto error; | |
fac6795d DG |
4015 | } |
4016 | ||
4017 | /* Check if daemon is UID = 0 */ | |
4018 | is_root = !getuid(); | |
4019 | ||
fac6795d | 4020 | if (is_root) { |
990570ed | 4021 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
67e40797 DG |
4022 | |
4023 | /* Create global run dir with root access */ | |
4024 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4025 | if (ret < 0) { |
cf3af59e | 4026 | goto error; |
d6f42150 DG |
4027 | } |
4028 | ||
fac6795d | 4029 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4030 | snprintf(apps_unix_sock_path, PATH_MAX, |
4031 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4032 | } |
4033 | ||
4034 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4035 | snprintf(client_unix_sock_path, PATH_MAX, |
4036 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4037 | } | |
0fdd1e2c DG |
4038 | |
4039 | /* Set global SHM for ust */ | |
4040 | if (strlen(wait_shm_path) == 0) { | |
4041 | snprintf(wait_shm_path, PATH_MAX, | |
4042 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4043 | } | |
67e40797 | 4044 | |
44a5e5eb DG |
4045 | if (strlen(health_unix_sock_path) == 0) { |
4046 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4047 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); | |
4048 | } | |
4049 | ||
67e40797 DG |
4050 | /* Setup kernel consumerd path */ |
4051 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4052 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
67e40797 | 4053 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4054 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4055 | |
4056 | DBG2("Kernel consumer err path: %s", | |
4057 | kconsumer_data.err_unix_sock_path); | |
4058 | DBG2("Kernel consumer cmd path: %s", | |
4059 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4060 | } else { |
b082db07 DG |
4061 | home_path = get_home_dir(); |
4062 | if (home_path == NULL) { | |
273ea72c DG |
4063 | /* TODO: Add --socket PATH option */ |
4064 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4065 | ret = -EPERM; |
4066 | goto error; | |
b082db07 DG |
4067 | } |
4068 | ||
67e40797 DG |
4069 | /* |
4070 | * Create rundir from home path. This will create something like | |
4071 | * $HOME/.lttng | |
4072 | */ | |
990570ed | 4073 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 DG |
4074 | if (ret < 0) { |
4075 | ret = -ENOMEM; | |
4076 | goto error; | |
4077 | } | |
4078 | ||
4079 | ret = create_lttng_rundir(rundir); | |
4080 | if (ret < 0) { | |
4081 | goto error; | |
4082 | } | |
4083 | ||
fac6795d | 4084 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4085 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4086 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4087 | } |
4088 | ||
4089 | /* Set the cli tool unix socket path */ | |
4090 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4091 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4092 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4093 | } |
0fdd1e2c DG |
4094 | |
4095 | /* Set global SHM for ust */ | |
4096 | if (strlen(wait_shm_path) == 0) { | |
4097 | snprintf(wait_shm_path, PATH_MAX, | |
d0b96690 | 4098 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid()); |
0fdd1e2c | 4099 | } |
44a5e5eb DG |
4100 | |
4101 | /* Set health check Unix path */ | |
4102 | if (strlen(health_unix_sock_path) == 0) { | |
4103 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
4104 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path); | |
4105 | } | |
fac6795d DG |
4106 | } |
4107 | ||
5c827ce0 DG |
4108 | /* Set consumer initial state */ |
4109 | kernel_consumerd_state = CONSUMER_STOPPED; | |
4110 | ust_consumerd_state = CONSUMER_STOPPED; | |
4111 | ||
847177cd DG |
4112 | DBG("Client socket path %s", client_unix_sock_path); |
4113 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 4114 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
4115 | DBG("LTTng run directory path: %s", rundir); |
4116 | ||
4117 | /* 32 bits consumerd path setup */ | |
4118 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4119 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
67e40797 | 4120 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4121 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4122 | |
4123 | DBG2("UST consumer 32 bits err path: %s", | |
4124 | ustconsumer32_data.err_unix_sock_path); | |
4125 | DBG2("UST consumer 32 bits cmd path: %s", | |
4126 | ustconsumer32_data.cmd_unix_sock_path); | |
4127 | ||
4128 | /* 64 bits consumerd path setup */ | |
4129 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
60922cb0 | 4130 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
67e40797 | 4131 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, |
60922cb0 | 4132 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
67e40797 DG |
4133 | |
4134 | DBG2("UST consumer 64 bits err path: %s", | |
4135 | ustconsumer64_data.err_unix_sock_path); | |
4136 | DBG2("UST consumer 64 bits cmd path: %s", | |
4137 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4138 | |
273ea72c | 4139 | /* |
7d8234d9 | 4140 | * See if daemon already exist. |
fac6795d | 4141 | */ |
7d8234d9 | 4142 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4143 | ERR("Already running daemon.\n"); |
273ea72c | 4144 | /* |
cf3af59e MD |
4145 | * We do not goto exit because we must not cleanup() |
4146 | * because a daemon is already running. | |
ab118b20 | 4147 | */ |
cf3af59e | 4148 | goto error; |
a88df331 DG |
4149 | } |
4150 | ||
1427f9b2 DG |
4151 | /* |
4152 | * Init UST app hash table. Alloc hash table before this point since | |
4153 | * cleanup() can get called after that point. | |
4154 | */ | |
4155 | ust_app_ht_alloc(); | |
4156 | ||
54d01ffb | 4157 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4158 | |
4159 | /* | |
4160 | * These actions must be executed as root. We do that *after* setting up | |
4161 | * the sockets path because we MUST make the check for another daemon using | |
4162 | * those paths *before* trying to set the kernel consumer sockets and init | |
4163 | * kernel tracer. | |
4164 | */ | |
4165 | if (is_root) { | |
67e40797 | 4166 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4167 | if (ret < 0) { |
4168 | goto exit; | |
4169 | } | |
4170 | ||
a88df331 | 4171 | /* Setup kernel tracer */ |
4fba7219 DG |
4172 | if (!opt_no_kernel) { |
4173 | init_kernel_tracer(); | |
4174 | } | |
a88df331 DG |
4175 | |
4176 | /* Set ulimit for open files */ | |
4177 | set_ulimit(); | |
fac6795d | 4178 | } |
4063050c MD |
4179 | /* init lttng_fd tracking must be done after set_ulimit. */ |
4180 | lttng_fd_init(); | |
fac6795d | 4181 | |
67e40797 DG |
4182 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4183 | if (ret < 0) { | |
4184 | goto exit; | |
4185 | } | |
4186 | ||
4187 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4188 | if (ret < 0) { | |
4189 | goto exit; | |
4190 | } | |
4191 | ||
cf3af59e MD |
4192 | if ((ret = set_signal_handler()) < 0) { |
4193 | goto exit; | |
fac6795d DG |
4194 | } |
4195 | ||
d6f42150 | 4196 | /* Setup the needed unix socket */ |
cf3af59e MD |
4197 | if ((ret = init_daemon_socket()) < 0) { |
4198 | goto exit; | |
fac6795d DG |
4199 | } |
4200 | ||
4201 | /* Set credentials to socket */ | |
be040666 | 4202 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4203 | goto exit; |
fac6795d DG |
4204 | } |
4205 | ||
5b8719f5 DG |
4206 | /* Get parent pid if -S, --sig-parent is specified. */ |
4207 | if (opt_sig_parent) { | |
4208 | ppid = getppid(); | |
4209 | } | |
4210 | ||
7a485870 | 4211 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 DG |
4212 | if (is_root && !opt_no_kernel) { |
4213 | if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) { | |
4214 | goto exit; | |
4215 | } | |
7a485870 DG |
4216 | } |
4217 | ||
099e26bd | 4218 | /* Setup the thread apps communication pipe. */ |
ef599319 | 4219 | if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) { |
099e26bd DG |
4220 | goto exit; |
4221 | } | |
4222 | ||
d0b96690 DG |
4223 | /* Setup the thread apps notify communication pipe. */ |
4224 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) { | |
4225 | goto exit; | |
4226 | } | |
4227 | ||
7972aab2 DG |
4228 | /* Initialize global buffer per UID and PID registry. */ |
4229 | buffer_reg_init_uid_registry(); | |
4230 | buffer_reg_init_pid_registry(); | |
4231 | ||
099e26bd DG |
4232 | /* Init UST command queue. */ |
4233 | cds_wfq_init(&ust_cmd_queue.queue); | |
4234 | ||
273ea72c | 4235 | /* |
54d01ffb DG |
4236 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4237 | * statically declared in session.c | |
273ea72c | 4238 | */ |
54d01ffb | 4239 | session_list_ptr = session_get_list(); |
b5541356 | 4240 | |
5eb91c98 DG |
4241 | /* Set up max poll set size */ |
4242 | lttng_poll_set_max_size(); | |
4243 | ||
2f77fc4b | 4244 | cmd_init(); |
00e2e675 | 4245 | |
ae9e45b3 DG |
4246 | /* Check for the application socket timeout env variable. */ |
4247 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
4248 | if (env_app_timeout) { | |
4249 | app_socket_timeout = atoi(env_app_timeout); | |
4250 | } else { | |
4251 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
4252 | } | |
4253 | ||
35f90c40 DG |
4254 | write_pidfile(); |
4255 | ||
44a5e5eb DG |
4256 | /* Create thread to manage the client socket */ |
4257 | ret = pthread_create(&health_thread, NULL, | |
4258 | thread_manage_health, (void *) NULL); | |
4259 | if (ret != 0) { | |
4260 | PERROR("pthread_create health"); | |
4261 | goto exit_health; | |
4262 | } | |
4263 | ||
cf3af59e | 4264 | /* Create thread to manage the client socket */ |
099e26bd DG |
4265 | ret = pthread_create(&client_thread, NULL, |
4266 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4267 | if (ret != 0) { |
76d7553f | 4268 | PERROR("pthread_create clients"); |
cf3af59e MD |
4269 | goto exit_client; |
4270 | } | |
fac6795d | 4271 | |
099e26bd DG |
4272 | /* Create thread to dispatch registration */ |
4273 | ret = pthread_create(&dispatch_thread, NULL, | |
4274 | thread_dispatch_ust_registration, (void *) NULL); | |
4275 | if (ret != 0) { | |
76d7553f | 4276 | PERROR("pthread_create dispatch"); |
099e26bd DG |
4277 | goto exit_dispatch; |
4278 | } | |
4279 | ||
4280 | /* Create thread to manage application registration. */ | |
4281 | ret = pthread_create(®_apps_thread, NULL, | |
4282 | thread_registration_apps, (void *) NULL); | |
4283 | if (ret != 0) { | |
76d7553f | 4284 | PERROR("pthread_create registration"); |
099e26bd DG |
4285 | goto exit_reg_apps; |
4286 | } | |
4287 | ||
cf3af59e | 4288 | /* Create thread to manage application socket */ |
54d01ffb DG |
4289 | ret = pthread_create(&apps_thread, NULL, |
4290 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4291 | if (ret != 0) { |
d0b96690 DG |
4292 | PERROR("pthread_create apps"); |
4293 | goto exit_apps; | |
4294 | } | |
4295 | ||
4296 | /* Create thread to manage application notify socket */ | |
4297 | ret = pthread_create(&apps_notify_thread, NULL, | |
4298 | ust_thread_manage_notify, (void *) NULL); | |
4299 | if (ret != 0) { | |
76d7553f | 4300 | PERROR("pthread_create apps"); |
cf3af59e MD |
4301 | goto exit_apps; |
4302 | } | |
fac6795d | 4303 | |
6620da75 DG |
4304 | /* Don't start this thread if kernel tracing is not requested nor root */ |
4305 | if (is_root && !opt_no_kernel) { | |
4306 | /* Create kernel thread to manage kernel event */ | |
4307 | ret = pthread_create(&kernel_thread, NULL, | |
4308 | thread_manage_kernel, (void *) NULL); | |
4309 | if (ret != 0) { | |
4310 | PERROR("pthread_create kernel"); | |
4311 | goto exit_kernel; | |
4312 | } | |
7a485870 | 4313 | |
6620da75 DG |
4314 | ret = pthread_join(kernel_thread, &status); |
4315 | if (ret != 0) { | |
4316 | PERROR("pthread_join"); | |
4317 | goto error; /* join error, exit without cleanup */ | |
4318 | } | |
fac6795d DG |
4319 | } |
4320 | ||
cf3af59e MD |
4321 | exit_kernel: |
4322 | ret = pthread_join(apps_thread, &status); | |
4323 | if (ret != 0) { | |
76d7553f | 4324 | PERROR("pthread_join"); |
cf3af59e MD |
4325 | goto error; /* join error, exit without cleanup */ |
4326 | } | |
fac6795d | 4327 | |
cf3af59e | 4328 | exit_apps: |
099e26bd DG |
4329 | ret = pthread_join(reg_apps_thread, &status); |
4330 | if (ret != 0) { | |
76d7553f | 4331 | PERROR("pthread_join"); |
099e26bd DG |
4332 | goto error; /* join error, exit without cleanup */ |
4333 | } | |
4334 | ||
4335 | exit_reg_apps: | |
4336 | ret = pthread_join(dispatch_thread, &status); | |
4337 | if (ret != 0) { | |
76d7553f | 4338 | PERROR("pthread_join"); |
099e26bd DG |
4339 | goto error; /* join error, exit without cleanup */ |
4340 | } | |
4341 | ||
4342 | exit_dispatch: | |
cf3af59e MD |
4343 | ret = pthread_join(client_thread, &status); |
4344 | if (ret != 0) { | |
76d7553f | 4345 | PERROR("pthread_join"); |
cf3af59e MD |
4346 | goto error; /* join error, exit without cleanup */ |
4347 | } | |
4348 | ||
3bd1e081 | 4349 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4350 | if (ret != 0) { |
76d7553f | 4351 | PERROR("join_consumer"); |
cf3af59e MD |
4352 | goto error; /* join error, exit without cleanup */ |
4353 | } | |
a88df331 | 4354 | |
06f525de DG |
4355 | ret = join_consumer_thread(&ustconsumer32_data); |
4356 | if (ret != 0) { | |
4357 | PERROR("join_consumer ust32"); | |
4358 | goto error; /* join error, exit without cleanup */ | |
4359 | } | |
4360 | ||
4361 | ret = join_consumer_thread(&ustconsumer64_data); | |
4362 | if (ret != 0) { | |
4363 | PERROR("join_consumer ust64"); | |
4364 | goto error; /* join error, exit without cleanup */ | |
4365 | } | |
4366 | ||
cf3af59e | 4367 | exit_client: |
06f525de DG |
4368 | ret = pthread_join(health_thread, &status); |
4369 | if (ret != 0) { | |
4370 | PERROR("pthread_join health thread"); | |
4371 | goto error; /* join error, exit without cleanup */ | |
4372 | } | |
4373 | ||
44a5e5eb | 4374 | exit_health: |
a88df331 | 4375 | exit: |
cf3af59e MD |
4376 | /* |
4377 | * cleanup() is called when no other thread is running. | |
4378 | */ | |
f6a9efaa | 4379 | rcu_thread_online(); |
cf3af59e | 4380 | cleanup(); |
f6a9efaa DG |
4381 | rcu_thread_offline(); |
4382 | rcu_unregister_thread(); | |
67e40797 | 4383 | if (!ret) { |
cf3af59e | 4384 | exit(EXIT_SUCCESS); |
67e40797 | 4385 | } |
cf3af59e | 4386 | error: |
5e16da05 | 4387 | exit(EXIT_FAILURE); |
fac6795d | 4388 | } |