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> |
26296c48 | 4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
fac6795d | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
91d76f53 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
fac6795d DG |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
0bb7724a | 24 | #include <paths.h> |
fac6795d DG |
25 | #include <pthread.h> |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
331744e3 | 30 | #include <inttypes.h> |
0fdd1e2c | 31 | #include <sys/mman.h> |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
0fdd1e2c | 37 | #include <sys/wait.h> |
5c827ce0 | 38 | #include <urcu/uatomic.h> |
fac6795d | 39 | #include <unistd.h> |
4f0b90ee | 40 | #include <ctype.h> |
fac6795d | 41 | |
990570ed | 42 | #include <common/common.h> |
d27c42b8 | 43 | #include <common/compat/socket.h> |
e8fa9fb0 | 44 | #include <common/compat/getenv.h> |
db758600 DG |
45 | #include <common/defaults.h> |
46 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 47 | #include <common/futex.h> |
00e2e675 | 48 | #include <common/relayd/relayd.h> |
81b86775 | 49 | #include <common/utils.h> |
3ccdf997 | 50 | #include <common/daemonize.h> |
f40ef1d5 | 51 | #include <common/config/session-config.h> |
dcabc190 FD |
52 | #include <common/dynamic-buffer.h> |
53 | #include <lttng/userspace-probe-internal.h> | |
76fcf151 | 54 | #include <lttng/event-internal.h> |
fac6795d | 55 | |
10a8a223 | 56 | #include "lttng-sessiond.h" |
7972aab2 | 57 | #include "buffer-registry.h" |
54d01ffb | 58 | #include "channel.h" |
2f77fc4b | 59 | #include "cmd.h" |
00e2e675 | 60 | #include "consumer.h" |
099e26bd | 61 | #include "context.h" |
54d01ffb | 62 | #include "event.h" |
4771f025 | 63 | #include "kernel.h" |
f1e16794 | 64 | #include "kernel-consumer.h" |
096102bd | 65 | #include "modprobe.h" |
0fdd1e2c | 66 | #include "shm.h" |
1e307fab | 67 | #include "ust-ctl.h" |
00e2e675 | 68 | #include "ust-consumer.h" |
8e68d1c8 | 69 | #include "utils.h" |
4063050c | 70 | #include "fd-limit.h" |
8782cc74 | 71 | #include "health-sessiond.h" |
8ac94142 | 72 | #include "testpoint.h" |
d0b96690 | 73 | #include "ust-thread.h" |
022d91ba | 74 | #include "agent-thread.h" |
fb198a11 | 75 | #include "save.h" |
ef367a93 | 76 | #include "load-session-thread.h" |
b3530820 JG |
77 | #include "notification-thread.h" |
78 | #include "notification-thread-commands.h" | |
db66e574 | 79 | #include "rotation-thread.h" |
0dbc2034 | 80 | #include "lttng-syscall.h" |
7c1d2758 | 81 | #include "agent.h" |
5e97de00 | 82 | #include "ht-cleanup.h" |
e6142f2e | 83 | #include "sessiond-config.h" |
8e319828 | 84 | #include "timer.h" |
ebaeda94 | 85 | |
4fc83d94 PP |
86 | static const char *help_msg = |
87 | #ifdef LTTNG_EMBED_HELP | |
88 | #include <lttng-sessiond.8.h> | |
89 | #else | |
90 | NULL | |
91 | #endif | |
92 | ; | |
93 | ||
fac6795d | 94 | const char *progname; |
c9cb3e7d | 95 | static int lockfile_fd = -1; |
3bd1e081 | 96 | |
0bb7724a DG |
97 | /* Set to 1 when a SIGUSR1 signal is received. */ |
98 | static int recv_child_signal; | |
99 | ||
88076e89 JD |
100 | static struct lttng_kernel_tracer_version kernel_tracer_version; |
101 | static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version; | |
102 | ||
a23ec3a7 DG |
103 | /* |
104 | * Consumer daemon specific control data. Every value not initialized here is | |
105 | * set to 0 by the static definition. | |
106 | */ | |
3bd1e081 MD |
107 | static struct consumer_data kconsumer_data = { |
108 | .type = LTTNG_CONSUMER_KERNEL, | |
03550b58 MD |
109 | .err_sock = -1, |
110 | .cmd_sock = -1, | |
b3530820 | 111 | .channel_monitor_pipe = -1, |
173af62f DG |
112 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
113 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
114 | .cond = PTHREAD_COND_INITIALIZER, |
115 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 116 | }; |
7753dea8 MD |
117 | static struct consumer_data ustconsumer64_data = { |
118 | .type = LTTNG_CONSUMER64_UST, | |
03550b58 MD |
119 | .err_sock = -1, |
120 | .cmd_sock = -1, | |
b3530820 | 121 | .channel_monitor_pipe = -1, |
173af62f DG |
122 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
123 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
124 | .cond = PTHREAD_COND_INITIALIZER, |
125 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
126 | }; |
127 | static struct consumer_data ustconsumer32_data = { | |
128 | .type = LTTNG_CONSUMER32_UST, | |
03550b58 MD |
129 | .err_sock = -1, |
130 | .cmd_sock = -1, | |
b3530820 | 131 | .channel_monitor_pipe = -1, |
173af62f DG |
132 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
133 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
134 | .cond = PTHREAD_COND_INITIALIZER, |
135 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
136 | }; |
137 | ||
26296c48 JG |
138 | /* Command line options */ |
139 | static const struct option long_options[] = { | |
0f5ea17c JG |
140 | { "client-sock", required_argument, 0, 'c' }, |
141 | { "apps-sock", required_argument, 0, 'a' }, | |
142 | { "kconsumerd-cmd-sock", required_argument, 0, '\0' }, | |
143 | { "kconsumerd-err-sock", required_argument, 0, '\0' }, | |
144 | { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' }, | |
145 | { "ustconsumerd32-err-sock", required_argument, 0, '\0' }, | |
146 | { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' }, | |
147 | { "ustconsumerd64-err-sock", required_argument, 0, '\0' }, | |
148 | { "consumerd32-path", required_argument, 0, '\0' }, | |
149 | { "consumerd32-libdir", required_argument, 0, '\0' }, | |
150 | { "consumerd64-path", required_argument, 0, '\0' }, | |
151 | { "consumerd64-libdir", required_argument, 0, '\0' }, | |
152 | { "daemonize", no_argument, 0, 'd' }, | |
153 | { "background", no_argument, 0, 'b' }, | |
154 | { "sig-parent", no_argument, 0, 'S' }, | |
155 | { "help", no_argument, 0, 'h' }, | |
156 | { "group", required_argument, 0, 'g' }, | |
157 | { "version", no_argument, 0, 'V' }, | |
158 | { "quiet", no_argument, 0, 'q' }, | |
159 | { "verbose", no_argument, 0, 'v' }, | |
160 | { "verbose-consumer", no_argument, 0, '\0' }, | |
161 | { "no-kernel", no_argument, 0, '\0' }, | |
162 | { "pidfile", required_argument, 0, 'p' }, | |
163 | { "agent-tcp-port", required_argument, 0, '\0' }, | |
164 | { "config", required_argument, 0, 'f' }, | |
165 | { "load", required_argument, 0, 'l' }, | |
166 | { "kmod-probes", required_argument, 0, '\0' }, | |
167 | { "extra-kmod-probes", required_argument, 0, '\0' }, | |
26296c48 JG |
168 | { NULL, 0, 0, 0 } |
169 | }; | |
170 | ||
171 | /* Command line options to ignore from configuration file */ | |
172 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
173 | ||
26c9d55e | 174 | /* Shared between threads */ |
099e26bd | 175 | static int dispatch_thread_exit; |
fac6795d | 176 | |
1d4b027a | 177 | /* Sockets and FDs */ |
a4b35e07 MD |
178 | static int client_sock = -1; |
179 | static int apps_sock = -1; | |
1d4b027a | 180 | |
099e26bd DG |
181 | /* |
182 | * This pipe is used to inform the thread managing application communication | |
183 | * that a command is queued and ready to be processed. | |
184 | */ | |
76d7553f | 185 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 186 | |
1d4b027a | 187 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 188 | static pthread_t apps_thread; |
d0b96690 | 189 | static pthread_t apps_notify_thread; |
099e26bd | 190 | static pthread_t reg_apps_thread; |
1d4b027a | 191 | static pthread_t client_thread; |
7a485870 | 192 | static pthread_t kernel_thread; |
099e26bd | 193 | static pthread_t dispatch_thread; |
44a5e5eb | 194 | static pthread_t health_thread; |
0b2dc8df | 195 | static pthread_t ht_cleanup_thread; |
022d91ba | 196 | static pthread_t agent_reg_thread; |
ef367a93 | 197 | static pthread_t load_session_thread; |
b3530820 | 198 | static pthread_t notification_thread; |
db66e574 | 199 | static pthread_t rotation_thread; |
d086f507 | 200 | static pthread_t timer_thread; |
5eb91c98 | 201 | |
099e26bd DG |
202 | /* |
203 | * UST registration command queue. This queue is tied with a futex and uses a N | |
204 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
205 | * | |
b22c5da8 DG |
206 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
207 | * queue along with the wait/wake scheme. The thread_manage_apps receives down | |
208 | * the line new application socket and monitors it for any I/O error or clean | |
209 | * close that triggers an unregistration of the application. | |
099e26bd DG |
210 | */ |
211 | static struct ust_cmd_queue ust_cmd_queue; | |
212 | ||
2f77fc4b DG |
213 | static const char *module_proc_lttng = "/proc/lttng"; |
214 | ||
5c827ce0 DG |
215 | /* |
216 | * Consumer daemon state which is changed when spawning it, killing it or in | |
217 | * case of a fatal error. | |
218 | */ | |
219 | enum consumerd_state { | |
220 | CONSUMER_STARTED = 1, | |
221 | CONSUMER_STOPPED = 2, | |
222 | CONSUMER_ERROR = 3, | |
223 | }; | |
224 | ||
225 | /* | |
226 | * This consumer daemon state is used to validate if a client command will be | |
227 | * able to reach the consumer. If not, the client is informed. For instance, | |
228 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
229 | * error to the client. | |
230 | * | |
231 | * The following example shows a possible race condition of this scheme: | |
232 | * | |
233 | * consumer thread error happens | |
234 | * client cmd arrives | |
235 | * client cmd checks state -> still OK | |
236 | * consumer thread exit, sets error | |
237 | * client cmd try to talk to consumer | |
238 | * ... | |
239 | * | |
240 | * However, since the consumer is a different daemon, we have no way of making | |
241 | * sure the command will reach it safely even with this state flag. This is why | |
242 | * we consider that up to the state validation during command processing, the | |
243 | * command is safe. After that, we can not guarantee the correctness of the | |
244 | * client request vis-a-vis the consumer. | |
245 | */ | |
246 | static enum consumerd_state ust_consumerd_state; | |
247 | static enum consumerd_state kernel_consumerd_state; | |
248 | ||
ef367a93 | 249 | /* Load session thread information to operate. */ |
a7333da7 | 250 | static struct load_session_thread_data *load_info; |
7c1d2758 | 251 | |
97bc1426 | 252 | /* |
a7333da7 | 253 | * Section name to look for in the daemon configuration file. |
97bc1426 | 254 | */ |
a7333da7 | 255 | static const char * const config_section_name = "sessiond"; |
5e97de00 | 256 | |
a7333da7 JG |
257 | /* Am I root or not. Set to 1 if the daemon is running as root */ |
258 | static int is_root; | |
5eb91c98 | 259 | |
a7333da7 JG |
260 | /* Rotation thread handle. */ |
261 | static struct rotation_thread_handle *rotation_thread_handle; | |
4a15001e | 262 | |
099e26bd DG |
263 | /* |
264 | * Stop all threads by closing the thread quit pipe. | |
265 | */ | |
cf3af59e MD |
266 | static void stop_threads(void) |
267 | { | |
5eb91c98 DG |
268 | int ret; |
269 | ||
cf3af59e MD |
270 | /* Stopping all threads */ |
271 | DBG("Terminating all threads"); | |
a7333da7 | 272 | ret = sessiond_notify_quit_pipe(); |
5eb91c98 DG |
273 | if (ret < 0) { |
274 | ERR("write error on thread quit pipe"); | |
275 | } | |
276 | ||
099e26bd | 277 | /* Dispatch thread */ |
26c9d55e | 278 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 279 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
280 | } |
281 | ||
e975f9f8 DG |
282 | /* |
283 | * Close every consumer sockets. | |
284 | */ | |
285 | static void close_consumer_sockets(void) | |
286 | { | |
287 | int ret; | |
288 | ||
289 | if (kconsumer_data.err_sock >= 0) { | |
290 | ret = close(kconsumer_data.err_sock); | |
291 | if (ret < 0) { | |
292 | PERROR("kernel consumer err_sock close"); | |
293 | } | |
294 | } | |
295 | if (ustconsumer32_data.err_sock >= 0) { | |
296 | ret = close(ustconsumer32_data.err_sock); | |
297 | if (ret < 0) { | |
a76cbd9f | 298 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
299 | } |
300 | } | |
301 | if (ustconsumer64_data.err_sock >= 0) { | |
302 | ret = close(ustconsumer64_data.err_sock); | |
303 | if (ret < 0) { | |
a76cbd9f | 304 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
305 | } |
306 | } | |
307 | if (kconsumer_data.cmd_sock >= 0) { | |
308 | ret = close(kconsumer_data.cmd_sock); | |
309 | if (ret < 0) { | |
310 | PERROR("kernel consumer cmd_sock close"); | |
311 | } | |
312 | } | |
313 | if (ustconsumer32_data.cmd_sock >= 0) { | |
314 | ret = close(ustconsumer32_data.cmd_sock); | |
315 | if (ret < 0) { | |
a76cbd9f | 316 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
317 | } |
318 | } | |
319 | if (ustconsumer64_data.cmd_sock >= 0) { | |
320 | ret = close(ustconsumer64_data.cmd_sock); | |
321 | if (ret < 0) { | |
a76cbd9f | 322 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
323 | } |
324 | } | |
b3530820 JG |
325 | if (kconsumer_data.channel_monitor_pipe >= 0) { |
326 | ret = close(kconsumer_data.channel_monitor_pipe); | |
327 | if (ret < 0) { | |
328 | PERROR("kernel consumer channel monitor pipe close"); | |
329 | } | |
330 | } | |
331 | if (ustconsumer32_data.channel_monitor_pipe >= 0) { | |
332 | ret = close(ustconsumer32_data.channel_monitor_pipe); | |
333 | if (ret < 0) { | |
334 | PERROR("UST consumerd32 channel monitor pipe close"); | |
335 | } | |
336 | } | |
337 | if (ustconsumer64_data.channel_monitor_pipe >= 0) { | |
338 | ret = close(ustconsumer64_data.channel_monitor_pipe); | |
339 | if (ret < 0) { | |
340 | PERROR("UST consumerd64 channel monitor pipe close"); | |
341 | } | |
342 | } | |
e975f9f8 DG |
343 | } |
344 | ||
4e4714cb JR |
345 | /* |
346 | * Wait on consumer process termination. | |
347 | * | |
348 | * Need to be called with the consumer data lock held or from a context | |
349 | * ensuring no concurrent access to data (e.g: cleanup). | |
350 | */ | |
351 | static void wait_consumer(struct consumer_data *consumer_data) | |
352 | { | |
353 | pid_t ret; | |
354 | int status; | |
355 | ||
356 | if (consumer_data->pid <= 0) { | |
357 | return; | |
358 | } | |
359 | ||
360 | DBG("Waiting for complete teardown of consumerd (PID: %d)", | |
361 | consumer_data->pid); | |
362 | ret = waitpid(consumer_data->pid, &status, 0); | |
363 | if (ret == -1) { | |
364 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) | |
1640c24c | 365 | } else if (!WIFEXITED(status)) { |
4e4714cb JR |
366 | ERR("consumerd termination with error: %d", |
367 | WEXITSTATUS(ret)); | |
368 | } | |
369 | consumer_data->pid = 0; | |
370 | } | |
371 | ||
fac6795d | 372 | /* |
4a15001e | 373 | * Cleanup the session daemon's data structures. |
fac6795d | 374 | */ |
4a15001e | 375 | static void sessiond_cleanup(void) |
fac6795d | 376 | { |
ef599319 | 377 | int ret; |
af9737e9 | 378 | struct ltt_session *sess, *stmp; |
e32d7f27 | 379 | struct ltt_session_list *session_list = session_get_list(); |
fac6795d | 380 | |
4a15001e | 381 | DBG("Cleanup sessiond"); |
e07ae692 | 382 | |
4e449f3f MD |
383 | /* |
384 | * Close the thread quit pipe. It has already done its job, | |
385 | * since we are now called. | |
386 | */ | |
a7333da7 | 387 | sessiond_close_quit_pipe(); |
2f77fc4b | 388 | |
c9a2957d JG |
389 | ret = remove(config.pid_file_path.value); |
390 | if (ret < 0) { | |
391 | PERROR("remove pidfile %s", config.pid_file_path.value); | |
35f90c40 DG |
392 | } |
393 | ||
e6142f2e JG |
394 | DBG("Removing sessiond and consumerd content of directory %s", |
395 | config.rundir.value); | |
8c6c56c2 MD |
396 | |
397 | /* sessiond */ | |
e6142f2e JG |
398 | DBG("Removing %s", config.pid_file_path.value); |
399 | (void) unlink(config.pid_file_path.value); | |
8c6c56c2 | 400 | |
e6142f2e JG |
401 | DBG("Removing %s", config.agent_port_file_path.value); |
402 | (void) unlink(config.agent_port_file_path.value); | |
cd9290dd | 403 | |
8c6c56c2 | 404 | /* kconsumerd */ |
e6142f2e JG |
405 | DBG("Removing %s", kconsumer_data.err_unix_sock_path); |
406 | (void) unlink(kconsumer_data.err_unix_sock_path); | |
407 | ||
408 | DBG("Removing directory %s", config.kconsumerd_path.value); | |
409 | (void) rmdir(config.kconsumerd_path.value); | |
8c6c56c2 MD |
410 | |
411 | /* ust consumerd 32 */ | |
e6142f2e JG |
412 | DBG("Removing %s", config.consumerd32_err_unix_sock_path.value); |
413 | (void) unlink(config.consumerd32_err_unix_sock_path.value); | |
414 | ||
415 | DBG("Removing directory %s", config.consumerd32_path.value); | |
416 | (void) rmdir(config.consumerd32_path.value); | |
8c6c56c2 MD |
417 | |
418 | /* ust consumerd 64 */ | |
e6142f2e JG |
419 | DBG("Removing %s", config.consumerd64_err_unix_sock_path.value); |
420 | (void) unlink(config.consumerd64_err_unix_sock_path.value); | |
421 | ||
422 | DBG("Removing directory %s", config.consumerd64_path.value); | |
423 | (void) rmdir(config.consumerd64_path.value); | |
5461b305 | 424 | |
99bab54f | 425 | DBG("Cleaning up all sessions"); |
fac6795d | 426 | |
b5541356 | 427 | /* Destroy session list mutex */ |
e32d7f27 JG |
428 | if (session_list) { |
429 | session_lock_list(); | |
273ea72c | 430 | /* Cleanup ALL session */ |
54d01ffb | 431 | cds_list_for_each_entry_safe(sess, stmp, |
e32d7f27 JG |
432 | &session_list->head, list) { |
433 | if (sess->destroyed) { | |
434 | continue; | |
435 | } | |
436 | cmd_destroy_session(sess, | |
90936dcf | 437 | notification_thread_handle); |
273ea72c | 438 | } |
e32d7f27 JG |
439 | session_unlock_list(); |
440 | pthread_mutex_destroy(&session_list->lock); | |
273ea72c DG |
441 | } |
442 | ||
4e4714cb JR |
443 | wait_consumer(&kconsumer_data); |
444 | wait_consumer(&ustconsumer64_data); | |
445 | wait_consumer(&ustconsumer32_data); | |
446 | ||
6a4e4039 JG |
447 | DBG("Cleaning up all agent apps"); |
448 | agent_app_ht_clean(); | |
449 | ||
099e26bd | 450 | DBG("Closing all UST sockets"); |
56fff090 | 451 | ust_app_clean_list(); |
7972aab2 | 452 | buffer_reg_destroy_registries(); |
099e26bd | 453 | |
e6142f2e | 454 | if (is_root && !config.no_kernel) { |
4fba7219 | 455 | DBG2("Closing kernel fd"); |
a4b35e07 | 456 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
457 | ret = close(kernel_tracer_fd); |
458 | if (ret) { | |
459 | PERROR("close"); | |
460 | } | |
a4b35e07 | 461 | } |
2f50c8a3 | 462 | DBG("Unloading kernel modules"); |
096102bd | 463 | modprobe_remove_lttng_all(); |
834978fd | 464 | free(syscall_table); |
2f50c8a3 | 465 | } |
2f77fc4b | 466 | |
e975f9f8 DG |
467 | close_consumer_sockets(); |
468 | ||
ef367a93 JG |
469 | if (load_info) { |
470 | load_session_destroy_data(load_info); | |
471 | free(load_info); | |
472 | } | |
473 | ||
c9cb3e7d JG |
474 | /* |
475 | * We do NOT rmdir rundir because there are other processes | |
476 | * using it, for instance lttng-relayd, which can start in | |
477 | * parallel with this teardown. | |
478 | */ | |
4a15001e MD |
479 | } |
480 | ||
481 | /* | |
482 | * Cleanup the daemon's option data structures. | |
483 | */ | |
484 | static void sessiond_cleanup_options(void) | |
485 | { | |
486 | DBG("Cleaning up options"); | |
487 | ||
e6142f2e | 488 | sessiond_config_fini(&config); |
c9cb3e7d | 489 | |
7567352f | 490 | run_as_destroy_worker(); |
fac6795d DG |
491 | } |
492 | ||
e065084a | 493 | /* |
d063d709 | 494 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 495 | * |
d063d709 | 496 | * Return lttcomm error code. |
e065084a DG |
497 | */ |
498 | static int send_unix_sock(int sock, void *buf, size_t len) | |
499 | { | |
500 | /* Check valid length */ | |
c617c0c6 | 501 | if (len == 0) { |
e065084a DG |
502 | return -1; |
503 | } | |
504 | ||
505 | return lttcomm_send_unix_sock(sock, buf, len); | |
506 | } | |
507 | ||
5461b305 | 508 | /* |
d063d709 | 509 | * Free memory of a command context structure. |
5461b305 | 510 | */ |
a2fb29a5 | 511 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 512 | { |
a2fb29a5 DG |
513 | DBG("Clean command context structure"); |
514 | if (*cmd_ctx) { | |
515 | if ((*cmd_ctx)->llm) { | |
516 | free((*cmd_ctx)->llm); | |
5461b305 | 517 | } |
a2fb29a5 DG |
518 | if ((*cmd_ctx)->lsm) { |
519 | free((*cmd_ctx)->lsm); | |
5461b305 | 520 | } |
a2fb29a5 DG |
521 | free(*cmd_ctx); |
522 | *cmd_ctx = NULL; | |
5461b305 DG |
523 | } |
524 | } | |
525 | ||
fac6795d | 526 | /* |
0fdd1e2c | 527 | * Notify UST applications using the shm mmap futex. |
fac6795d | 528 | */ |
0fdd1e2c | 529 | static int notify_ust_apps(int active) |
fac6795d | 530 | { |
0fdd1e2c | 531 | char *wait_shm_mmap; |
fac6795d | 532 | |
0fdd1e2c | 533 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 534 | |
0fdd1e2c | 535 | /* See shm.c for this call implying mmap, shm and futex calls */ |
e6142f2e | 536 | wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root); |
0fdd1e2c | 537 | if (wait_shm_mmap == NULL) { |
fac6795d DG |
538 | goto error; |
539 | } | |
540 | ||
0fdd1e2c DG |
541 | /* Wake waiting process */ |
542 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
543 | ||
544 | /* Apps notified successfully */ | |
545 | return 0; | |
fac6795d DG |
546 | |
547 | error: | |
0fdd1e2c | 548 | return -1; |
fac6795d DG |
549 | } |
550 | ||
e065084a | 551 | /* |
d063d709 DG |
552 | * Setup the outgoing data buffer for the response (llm) by allocating the |
553 | * right amount of memory and copying the original information from the lsm | |
554 | * structure. | |
ca95a216 | 555 | * |
6e10c9b9 | 556 | * Return 0 on success, negative value on error. |
ca95a216 | 557 | */ |
6e10c9b9 PP |
558 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
559 | const void *payload_buf, size_t payload_len, | |
560 | const void *cmd_header_buf, size_t cmd_header_len) | |
ca95a216 | 561 | { |
6e10c9b9 PP |
562 | int ret = 0; |
563 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
564 | const size_t cmd_header_offset = header_len; | |
565 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
566 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
ca95a216 | 567 | |
6e10c9b9 | 568 | cmd_ctx->llm = zmalloc(total_msg_size); |
5461b305 | 569 | |
5461b305 | 570 | if (cmd_ctx->llm == NULL) { |
76d7553f | 571 | PERROR("zmalloc"); |
5461b305 | 572 | ret = -ENOMEM; |
6e10c9b9 | 573 | goto end; |
ca95a216 DG |
574 | } |
575 | ||
5461b305 DG |
576 | /* Copy common data */ |
577 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 578 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
6e10c9b9 PP |
579 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
580 | cmd_ctx->llm->data_size = payload_len; | |
581 | cmd_ctx->lttng_msg_size = total_msg_size; | |
5461b305 | 582 | |
6e10c9b9 | 583 | /* Copy command header */ |
b4e3ceb9 PP |
584 | if (cmd_header_len) { |
585 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
586 | cmd_header_len); | |
587 | } | |
5461b305 | 588 | |
6e10c9b9 | 589 | /* Copy payload */ |
b4e3ceb9 PP |
590 | if (payload_len) { |
591 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
592 | payload_len); | |
593 | } | |
ca95a216 | 594 | |
6e10c9b9 | 595 | end: |
ca95a216 DG |
596 | return ret; |
597 | } | |
598 | ||
6e10c9b9 PP |
599 | /* |
600 | * Version of setup_lttng_msg() without command header. | |
601 | */ | |
602 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
603 | void *payload_buf, size_t payload_len) | |
604 | { | |
605 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
606 | } | |
7a485870 | 607 | /* |
5eb91c98 | 608 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 609 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 610 | */ |
5eb91c98 | 611 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 612 | { |
5eb91c98 | 613 | int ret; |
7a485870 | 614 | struct ltt_kernel_channel *channel; |
e32d7f27 JG |
615 | struct ltt_session *session; |
616 | const struct ltt_session_list *session_list = session_get_list(); | |
7a485870 | 617 | |
5eb91c98 | 618 | DBG("Updating kernel poll set"); |
7a485870 | 619 | |
54d01ffb | 620 | session_lock_list(); |
e32d7f27 JG |
621 | cds_list_for_each_entry(session, &session_list->head, list) { |
622 | if (!session_get(session)) { | |
623 | continue; | |
624 | } | |
54d01ffb | 625 | session_lock(session); |
7a485870 | 626 | if (session->kernel_session == NULL) { |
54d01ffb | 627 | session_unlock(session); |
e32d7f27 | 628 | session_put(session); |
7a485870 DG |
629 | continue; |
630 | } | |
7a485870 | 631 | |
54d01ffb DG |
632 | cds_list_for_each_entry(channel, |
633 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
634 | /* Add channel fd to the kernel poll set */ |
635 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
636 | if (ret < 0) { | |
54d01ffb | 637 | session_unlock(session); |
e32d7f27 | 638 | session_put(session); |
5eb91c98 DG |
639 | goto error; |
640 | } | |
641 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 642 | } |
54d01ffb | 643 | session_unlock(session); |
7a485870 | 644 | } |
54d01ffb | 645 | session_unlock_list(); |
7a485870 | 646 | |
5eb91c98 | 647 | return 0; |
7a485870 DG |
648 | |
649 | error: | |
54d01ffb | 650 | session_unlock_list(); |
7a485870 DG |
651 | return -1; |
652 | } | |
653 | ||
654 | /* | |
54d01ffb | 655 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 656 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 657 | * |
d063d709 | 658 | * Useful for CPU hotplug feature. |
7a485870 | 659 | */ |
7f032058 | 660 | static int update_kernel_stream(int fd) |
7a485870 DG |
661 | { |
662 | int ret = 0; | |
663 | struct ltt_session *session; | |
173af62f | 664 | struct ltt_kernel_session *ksess; |
7a485870 | 665 | struct ltt_kernel_channel *channel; |
e32d7f27 | 666 | const struct ltt_session_list *session_list = session_get_list(); |
7a485870 DG |
667 | |
668 | DBG("Updating kernel streams for channel fd %d", fd); | |
669 | ||
54d01ffb | 670 | session_lock_list(); |
e32d7f27 JG |
671 | cds_list_for_each_entry(session, &session_list->head, list) { |
672 | if (!session_get(session)) { | |
673 | continue; | |
674 | } | |
54d01ffb | 675 | session_lock(session); |
7a485870 | 676 | if (session->kernel_session == NULL) { |
54d01ffb | 677 | session_unlock(session); |
e32d7f27 | 678 | session_put(session); |
7a485870 DG |
679 | continue; |
680 | } | |
173af62f | 681 | ksess = session->kernel_session; |
d9800920 | 682 | |
4a15001e MD |
683 | cds_list_for_each_entry(channel, |
684 | &ksess->channel_list.head, list) { | |
685 | struct lttng_ht_iter iter; | |
686 | struct consumer_socket *socket; | |
d9800920 | 687 | |
4a15001e MD |
688 | if (channel->fd != fd) { |
689 | continue; | |
690 | } | |
691 | DBG("Channel found, updating kernel streams"); | |
692 | ret = kernel_open_channel_stream(channel); | |
693 | if (ret < 0) { | |
694 | goto error; | |
695 | } | |
696 | /* Update the stream global counter */ | |
697 | ksess->stream_count_global += ret; | |
698 | ||
699 | /* | |
700 | * Have we already sent fds to the consumer? If yes, it | |
701 | * means that tracing is started so it is safe to send | |
702 | * our updated stream fds. | |
703 | */ | |
704 | if (ksess->consumer_fds_sent != 1 | |
705 | || ksess->consumer == NULL) { | |
706 | ret = -1; | |
707 | goto error; | |
708 | } | |
709 | ||
710 | rcu_read_lock(); | |
711 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
712 | &iter.iter, socket, node.node) { | |
713 | pthread_mutex_lock(socket->lock); | |
1fc1b7c8 | 714 | ret = kernel_consumer_send_channel_streams(socket, |
4a15001e MD |
715 | channel, ksess, |
716 | session->output_traces ? 1 : 0); | |
717 | pthread_mutex_unlock(socket->lock); | |
718 | if (ret < 0) { | |
e7fe706f | 719 | rcu_read_unlock(); |
4a15001e | 720 | goto error; |
7a485870 | 721 | } |
7a485870 | 722 | } |
4a15001e | 723 | rcu_read_unlock(); |
7a485870 | 724 | } |
54d01ffb | 725 | session_unlock(session); |
e32d7f27 | 726 | session_put(session); |
7a485870 | 727 | } |
54d01ffb | 728 | session_unlock_list(); |
b3c750d2 | 729 | return ret; |
7a485870 | 730 | |
b3c750d2 | 731 | error: |
54d01ffb | 732 | session_unlock(session); |
e32d7f27 | 733 | session_put(session); |
54d01ffb | 734 | session_unlock_list(); |
7a485870 DG |
735 | return ret; |
736 | } | |
737 | ||
487cf67c | 738 | /* |
ffe60014 DG |
739 | * For each tracing session, update newly registered apps. The session list |
740 | * lock MUST be acquired before calling this. | |
487cf67c DG |
741 | */ |
742 | static void update_ust_app(int app_sock) | |
743 | { | |
744 | struct ltt_session *sess, *stmp; | |
e32d7f27 | 745 | const struct ltt_session_list *session_list = session_get_list(); |
487cf67c | 746 | |
fdadac08 DG |
747 | /* Consumer is in an ERROR state. Stop any application update. */ |
748 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
749 | /* Stop the update process since the consumer is dead. */ | |
750 | return; | |
751 | } | |
752 | ||
487cf67c | 753 | /* For all tracing session(s) */ |
e32d7f27 | 754 | cds_list_for_each_entry_safe(sess, stmp, &session_list->head, list) { |
a9ad0c8f MD |
755 | struct ust_app *app; |
756 | ||
e32d7f27 JG |
757 | if (!session_get(sess)) { |
758 | continue; | |
759 | } | |
4ee14516 | 760 | session_lock(sess); |
a9ad0c8f MD |
761 | if (!sess->ust_session) { |
762 | goto unlock_session; | |
763 | } | |
764 | ||
765 | rcu_read_lock(); | |
766 | assert(app_sock >= 0); | |
767 | app = ust_app_find_by_sock(app_sock); | |
768 | if (app == NULL) { | |
769 | /* | |
770 | * Application can be unregistered before so | |
771 | * this is possible hence simply stopping the | |
772 | * update. | |
773 | */ | |
774 | DBG3("UST app update failed to find app sock %d", | |
775 | app_sock); | |
776 | goto unlock_rcu; | |
421cb601 | 777 | } |
a9ad0c8f MD |
778 | ust_app_global_update(sess->ust_session, app); |
779 | unlock_rcu: | |
780 | rcu_read_unlock(); | |
781 | unlock_session: | |
4ee14516 | 782 | session_unlock(sess); |
e32d7f27 | 783 | session_put(sess); |
487cf67c DG |
784 | } |
785 | } | |
786 | ||
7a485870 | 787 | /* |
d063d709 | 788 | * This thread manage event coming from the kernel. |
7a485870 | 789 | * |
d063d709 DG |
790 | * Features supported in this thread: |
791 | * -) CPU Hotplug | |
7a485870 DG |
792 | */ |
793 | static void *thread_manage_kernel(void *data) | |
794 | { | |
139ac872 | 795 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 796 | uint32_t revents, nb_fd; |
7a485870 | 797 | char tmp; |
5eb91c98 | 798 | struct lttng_poll_event events; |
7a485870 | 799 | |
6993eeb3 | 800 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 801 | |
6c71277b | 802 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 803 | |
d5d63bf1 DG |
804 | /* |
805 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 806 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 807 | */ |
6d737ce4 | 808 | lttng_poll_init(&events); |
d5d63bf1 | 809 | |
e547b070 | 810 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
811 | goto error_testpoint; |
812 | } | |
8ac94142 | 813 | |
840cb59c | 814 | health_code_update(); |
44a5e5eb | 815 | |
e547b070 | 816 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 817 | goto error_testpoint; |
6993eeb3 CB |
818 | } |
819 | ||
7a485870 | 820 | while (1) { |
840cb59c | 821 | health_code_update(); |
44a5e5eb | 822 | |
7a485870 | 823 | if (update_poll_flag == 1) { |
d21b0d71 DG |
824 | /* Clean events object. We are about to populate it again. */ |
825 | lttng_poll_clean(&events); | |
826 | ||
d0b96690 | 827 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
828 | if (ret < 0) { |
829 | goto error_poll_create; | |
830 | } | |
831 | ||
832 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
833 | if (ret < 0) { | |
834 | goto error; | |
835 | } | |
5f822d0a | 836 | |
d21b0d71 | 837 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
838 | ret = update_kernel_poll(&events); |
839 | if (ret < 0) { | |
7a485870 DG |
840 | goto error; |
841 | } | |
842 | update_poll_flag = 0; | |
843 | } | |
844 | ||
7fa2082e | 845 | DBG("Thread kernel polling"); |
7a485870 DG |
846 | |
847 | /* Poll infinite value of time */ | |
88f2b785 | 848 | restart: |
a78af745 | 849 | health_poll_entry(); |
5eb91c98 | 850 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
851 | DBG("Thread kernel return from poll on %d fds", |
852 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 853 | health_poll_exit(); |
7a485870 | 854 | if (ret < 0) { |
88f2b785 MD |
855 | /* |
856 | * Restart interrupted system call. | |
857 | */ | |
858 | if (errno == EINTR) { | |
859 | goto restart; | |
860 | } | |
7a485870 DG |
861 | goto error; |
862 | } else if (ret == 0) { | |
863 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
864 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
865 | "This should not have happened! Continuing..."); | |
7a485870 DG |
866 | continue; |
867 | } | |
868 | ||
0d9c5d77 DG |
869 | nb_fd = ret; |
870 | ||
5eb91c98 DG |
871 | for (i = 0; i < nb_fd; i++) { |
872 | /* Fetch once the poll data */ | |
873 | revents = LTTNG_POLL_GETEV(&events, i); | |
874 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 875 | |
840cb59c | 876 | health_code_update(); |
44a5e5eb | 877 | |
fd20dac9 MD |
878 | if (!revents) { |
879 | /* No activity for this FD (poll implementation). */ | |
880 | continue; | |
881 | } | |
882 | ||
5eb91c98 | 883 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 884 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 885 | if (ret) { |
139ac872 MD |
886 | err = 0; |
887 | goto exit; | |
5eb91c98 | 888 | } |
7a485870 | 889 | |
5eb91c98 | 890 | /* Check for data on kernel pipe */ |
03e43155 MD |
891 | if (revents & LPOLLIN) { |
892 | if (pollfd == kernel_poll_pipe[0]) { | |
893 | (void) lttng_read(kernel_poll_pipe[0], | |
894 | &tmp, 1); | |
895 | /* | |
896 | * Ret value is useless here, if this pipe gets any actions an | |
897 | * update is required anyway. | |
898 | */ | |
899 | update_poll_flag = 1; | |
900 | continue; | |
901 | } else { | |
902 | /* | |
903 | * New CPU detected by the kernel. Adding kernel stream to | |
904 | * kernel session and updating the kernel consumer | |
905 | */ | |
7f032058 | 906 | ret = update_kernel_stream(pollfd); |
5eb91c98 DG |
907 | if (ret < 0) { |
908 | continue; | |
909 | } | |
910 | break; | |
7a485870 | 911 | } |
03e43155 MD |
912 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
913 | update_poll_flag = 1; | |
914 | continue; | |
915 | } else { | |
916 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
917 | goto error; | |
7a485870 DG |
918 | } |
919 | } | |
920 | } | |
921 | ||
139ac872 | 922 | exit: |
7a485870 | 923 | error: |
5eb91c98 | 924 | lttng_poll_clean(&events); |
76d7553f | 925 | error_poll_create: |
6993eeb3 | 926 | error_testpoint: |
6620da75 DG |
927 | utils_close_pipe(kernel_poll_pipe); |
928 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 929 | if (err) { |
840cb59c | 930 | health_error(); |
139ac872 | 931 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
932 | WARN("Kernel thread died unexpectedly. " |
933 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 934 | } |
8782cc74 | 935 | health_unregister(health_sessiond); |
76d7553f | 936 | DBG("Kernel thread dying"); |
7a485870 DG |
937 | return NULL; |
938 | } | |
939 | ||
a23ec3a7 DG |
940 | /* |
941 | * Signal pthread condition of the consumer data that the thread. | |
942 | */ | |
943 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
944 | { | |
945 | pthread_mutex_lock(&data->cond_mutex); | |
946 | ||
947 | /* | |
948 | * The state is set before signaling. It can be any value, it's the waiter | |
949 | * job to correctly interpret this condition variable associated to the | |
950 | * consumer pthread_cond. | |
951 | * | |
952 | * A value of 0 means that the corresponding thread of the consumer data | |
953 | * was not started. 1 indicates that the thread has started and is ready | |
954 | * for action. A negative value means that there was an error during the | |
955 | * thread bootstrap. | |
956 | */ | |
957 | data->consumer_thread_is_ready = state; | |
958 | (void) pthread_cond_signal(&data->cond); | |
959 | ||
960 | pthread_mutex_unlock(&data->cond_mutex); | |
961 | } | |
962 | ||
1d4b027a | 963 | /* |
3bd1e081 | 964 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 965 | */ |
3bd1e081 | 966 | static void *thread_manage_consumer(void *data) |
1d4b027a | 967 | { |
42fc1d0b | 968 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
5eb91c98 | 969 | uint32_t revents, nb_fd; |
1d4b027a | 970 | enum lttcomm_return_code code; |
5eb91c98 | 971 | struct lttng_poll_event events; |
3bd1e081 | 972 | struct consumer_data *consumer_data = data; |
b3530820 | 973 | struct consumer_socket *cmd_socket_wrapper = NULL; |
1d4b027a | 974 | |
3bd1e081 | 975 | DBG("[thread] Manage consumer started"); |
1d4b027a | 976 | |
34c1e15a MD |
977 | rcu_register_thread(); |
978 | rcu_thread_online(); | |
979 | ||
6c71277b | 980 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 981 | |
855060f8 | 982 | health_code_update(); |
9449cc75 | 983 | |
5eb91c98 | 984 | /* |
331744e3 JD |
985 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
986 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 987 | */ |
331744e3 | 988 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 989 | if (ret < 0) { |
76d7553f | 990 | goto error_poll; |
5eb91c98 | 991 | } |
273ea72c | 992 | |
edb8b045 DG |
993 | /* |
994 | * The error socket here is already in a listening state which was done | |
995 | * just before spawning this thread to avoid a race between the consumer | |
996 | * daemon exec trying to connect and the listen() call. | |
997 | */ | |
3bd1e081 | 998 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
999 | if (ret < 0) { |
1000 | goto error; | |
1001 | } | |
1002 | ||
840cb59c | 1003 | health_code_update(); |
44a5e5eb | 1004 | |
331744e3 | 1005 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1006 | restart: |
a78af745 | 1007 | health_poll_entry(); |
8ac94142 | 1008 | |
e547b070 | 1009 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1010 | goto error; |
1011 | } | |
8ac94142 | 1012 | |
5eb91c98 | 1013 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1014 | health_poll_exit(); |
273ea72c | 1015 | if (ret < 0) { |
88f2b785 MD |
1016 | /* |
1017 | * Restart interrupted system call. | |
1018 | */ | |
1019 | if (errno == EINTR) { | |
1020 | goto restart; | |
1021 | } | |
273ea72c DG |
1022 | goto error; |
1023 | } | |
1024 | ||
0d9c5d77 DG |
1025 | nb_fd = ret; |
1026 | ||
5eb91c98 DG |
1027 | for (i = 0; i < nb_fd; i++) { |
1028 | /* Fetch once the poll data */ | |
1029 | revents = LTTNG_POLL_GETEV(&events, i); | |
1030 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1031 | ||
840cb59c | 1032 | health_code_update(); |
44a5e5eb | 1033 | |
fd20dac9 MD |
1034 | if (!revents) { |
1035 | /* No activity for this FD (poll implementation). */ | |
1036 | continue; | |
1037 | } | |
1038 | ||
5eb91c98 | 1039 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1040 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1041 | if (ret) { |
139ac872 MD |
1042 | err = 0; |
1043 | goto exit; | |
5eb91c98 DG |
1044 | } |
1045 | ||
1046 | /* Event on the registration socket */ | |
3bd1e081 | 1047 | if (pollfd == consumer_data->err_sock) { |
03e43155 MD |
1048 | if (revents & LPOLLIN) { |
1049 | continue; | |
1050 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1051 | ERR("consumer err socket poll error"); |
5eb91c98 | 1052 | goto error; |
03e43155 MD |
1053 | } else { |
1054 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1055 | goto error; | |
5eb91c98 DG |
1056 | } |
1057 | } | |
273ea72c DG |
1058 | } |
1059 | ||
3bd1e081 | 1060 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1061 | if (sock < 0) { |
1062 | goto error; | |
1063 | } | |
1064 | ||
b662582b DG |
1065 | /* |
1066 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1067 | * show must go on. | |
1068 | */ | |
1069 | (void) utils_set_fd_cloexec(sock); | |
1070 | ||
840cb59c | 1071 | health_code_update(); |
44a5e5eb | 1072 | |
3bd1e081 | 1073 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1074 | |
712ea556 | 1075 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1076 | ret = lttcomm_recv_unix_sock(sock, &code, |
1077 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1078 | if (ret <= 0) { |
1079 | goto error; | |
1080 | } | |
1081 | ||
840cb59c | 1082 | health_code_update(); |
b3530820 | 1083 | if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 | 1084 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1085 | lttcomm_get_readable_code(-code)); |
1086 | goto error; | |
1087 | } | |
1088 | ||
b3530820 JG |
1089 | /* Connect both command and metadata sockets. */ |
1090 | consumer_data->cmd_sock = | |
1091 | lttcomm_connect_unix_sock( | |
1092 | consumer_data->cmd_unix_sock_path); | |
1093 | consumer_data->metadata_fd = | |
1094 | lttcomm_connect_unix_sock( | |
1095 | consumer_data->cmd_unix_sock_path); | |
1096 | if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) { | |
1097 | PERROR("consumer connect cmd socket"); | |
1098 | /* On error, signal condition and quit. */ | |
1099 | signal_consumer_condition(consumer_data, -1); | |
1100 | goto error; | |
1101 | } | |
1102 | ||
1103 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; | |
1104 | ||
1105 | /* Create metadata socket lock. */ | |
1106 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1107 | if (consumer_data->metadata_sock.lock == NULL) { | |
1108 | PERROR("zmalloc pthread mutex"); | |
1109 | goto error; | |
1110 | } | |
1111 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1112 | ||
1113 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); | |
1114 | DBG("Consumer metadata socket ready (fd: %d)", | |
1115 | consumer_data->metadata_fd); | |
1116 | ||
1117 | /* | |
1118 | * Remove the consumerd error sock since we've established a connection. | |
1119 | */ | |
3bd1e081 | 1120 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1121 | if (ret < 0) { |
72079cae DG |
1122 | goto error; |
1123 | } | |
1124 | ||
331744e3 | 1125 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1126 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1127 | if (ret < 0) { | |
72079cae | 1128 | goto error; |
5eb91c98 DG |
1129 | } |
1130 | ||
331744e3 | 1131 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1132 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1133 | LPOLLIN | LPOLLRDHUP); |
1134 | if (ret < 0) { | |
1135 | goto error; | |
1136 | } | |
1137 | ||
840cb59c | 1138 | health_code_update(); |
44a5e5eb | 1139 | |
b3530820 | 1140 | /* |
62c43103 | 1141 | * Transfer the write-end of the channel monitoring and rotate pipe |
92816cc3 | 1142 | * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE command. |
b3530820 JG |
1143 | */ |
1144 | cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock); | |
1145 | if (!cmd_socket_wrapper) { | |
1146 | goto error; | |
1147 | } | |
3e4dc117 | 1148 | cmd_socket_wrapper->lock = &consumer_data->lock; |
b3530820 JG |
1149 | |
1150 | ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper, | |
1151 | consumer_data->channel_monitor_pipe); | |
1152 | if (ret) { | |
1153 | goto error; | |
1154 | } | |
62c43103 | 1155 | |
b3530820 JG |
1156 | /* Discard the socket wrapper as it is no longer needed. */ |
1157 | consumer_destroy_socket(cmd_socket_wrapper); | |
1158 | cmd_socket_wrapper = NULL; | |
1159 | ||
1160 | /* The thread is completely initialized, signal that it is ready. */ | |
1161 | signal_consumer_condition(consumer_data, 1); | |
1162 | ||
331744e3 | 1163 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1164 | restart_poll: |
331744e3 | 1165 | while (1) { |
42fc1d0b DG |
1166 | health_code_update(); |
1167 | ||
1168 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
1169 | if (should_quit) { | |
1170 | /* Not a health error. */ | |
1171 | err = 0; | |
1172 | goto exit; | |
1173 | } | |
1174 | ||
331744e3 JD |
1175 | health_poll_entry(); |
1176 | ret = lttng_poll_wait(&events, -1); | |
1177 | health_poll_exit(); | |
1178 | if (ret < 0) { | |
1179 | /* | |
1180 | * Restart interrupted system call. | |
1181 | */ | |
1182 | if (errno == EINTR) { | |
1183 | goto restart_poll; | |
1184 | } | |
1185 | goto error; | |
88f2b785 | 1186 | } |
72079cae | 1187 | |
331744e3 | 1188 | nb_fd = ret; |
0d9c5d77 | 1189 | |
331744e3 JD |
1190 | for (i = 0; i < nb_fd; i++) { |
1191 | /* Fetch once the poll data */ | |
1192 | revents = LTTNG_POLL_GETEV(&events, i); | |
1193 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1194 | |
331744e3 | 1195 | health_code_update(); |
44a5e5eb | 1196 | |
fd20dac9 MD |
1197 | if (!revents) { |
1198 | /* No activity for this FD (poll implementation). */ | |
1199 | continue; | |
1200 | } | |
1201 | ||
42fc1d0b DG |
1202 | /* |
1203 | * Thread quit pipe has been triggered, flag that we should stop | |
1204 | * but continue the current loop to handle potential data from | |
1205 | * consumer. | |
1206 | */ | |
1207 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); | |
5eb91c98 | 1208 | |
331744e3 JD |
1209 | if (pollfd == sock) { |
1210 | /* Event on the consumerd socket */ | |
03e43155 MD |
1211 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1212 | && !(revents & LPOLLIN)) { | |
331744e3 JD |
1213 | ERR("consumer err socket second poll error"); |
1214 | goto error; | |
1215 | } | |
1216 | health_code_update(); | |
1217 | /* Wait for any kconsumerd error */ | |
1218 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1219 | sizeof(enum lttcomm_return_code)); | |
1220 | if (ret <= 0) { | |
1221 | ERR("consumer closed the command socket"); | |
1222 | goto error; | |
1223 | } | |
1224 | ||
1225 | ERR("consumer return code : %s", | |
1226 | lttcomm_get_readable_code(-code)); | |
1227 | ||
1228 | goto exit; | |
4ce514c4 | 1229 | } else if (pollfd == consumer_data->metadata_fd) { |
03e43155 MD |
1230 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1231 | && !(revents & LPOLLIN)) { | |
1232 | ERR("consumer err metadata socket second poll error"); | |
1233 | goto error; | |
1234 | } | |
331744e3 JD |
1235 | /* UST metadata requests */ |
1236 | ret = ust_consumer_metadata_request( | |
1237 | &consumer_data->metadata_sock); | |
1238 | if (ret < 0) { | |
1239 | ERR("Handling metadata request"); | |
1240 | goto error; | |
1241 | } | |
5eb91c98 | 1242 | } |
42fc1d0b | 1243 | /* No need for an else branch all FDs are tested prior. */ |
5eb91c98 | 1244 | } |
331744e3 | 1245 | health_code_update(); |
5eb91c98 DG |
1246 | } |
1247 | ||
139ac872 | 1248 | exit: |
1d4b027a | 1249 | error: |
fdadac08 DG |
1250 | /* |
1251 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1252 | * thread might be using them so get exclusive access which will abort all |
1253 | * other consumer command by other threads. | |
fdadac08 DG |
1254 | */ |
1255 | pthread_mutex_lock(&consumer_data->lock); | |
1256 | ||
5c827ce0 DG |
1257 | /* Immediately set the consumerd state to stopped */ |
1258 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1259 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1260 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1261 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1262 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1263 | } else { | |
1264 | /* Code flow error... */ | |
1265 | assert(0); | |
1266 | } | |
1267 | ||
76d7553f MD |
1268 | if (consumer_data->err_sock >= 0) { |
1269 | ret = close(consumer_data->err_sock); | |
1270 | if (ret) { | |
1271 | PERROR("close"); | |
1272 | } | |
a76cbd9f | 1273 | consumer_data->err_sock = -1; |
76d7553f MD |
1274 | } |
1275 | if (consumer_data->cmd_sock >= 0) { | |
1276 | ret = close(consumer_data->cmd_sock); | |
1277 | if (ret) { | |
1278 | PERROR("close"); | |
1279 | } | |
a76cbd9f | 1280 | consumer_data->cmd_sock = -1; |
76d7553f | 1281 | } |
96544455 SS |
1282 | if (consumer_data->metadata_sock.fd_ptr && |
1283 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1284 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1285 | if (ret) { |
1286 | PERROR("close"); | |
1287 | } | |
1288 | } | |
76d7553f MD |
1289 | if (sock >= 0) { |
1290 | ret = close(sock); | |
1291 | if (ret) { | |
1292 | PERROR("close"); | |
1293 | } | |
1294 | } | |
273ea72c | 1295 | |
3bd1e081 MD |
1296 | unlink(consumer_data->err_unix_sock_path); |
1297 | unlink(consumer_data->cmd_unix_sock_path); | |
fdadac08 | 1298 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1299 | |
fdadac08 | 1300 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1301 | if (consumer_data->metadata_sock.lock) { |
1302 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1303 | free(consumer_data->metadata_sock.lock); | |
1304 | } | |
5eb91c98 | 1305 | lttng_poll_clean(&events); |
b3530820 JG |
1306 | |
1307 | if (cmd_socket_wrapper) { | |
1308 | consumer_destroy_socket(cmd_socket_wrapper); | |
1309 | } | |
76d7553f | 1310 | error_poll: |
139ac872 | 1311 | if (err) { |
840cb59c | 1312 | health_error(); |
139ac872 MD |
1313 | ERR("Health error occurred in %s", __func__); |
1314 | } | |
8782cc74 | 1315 | health_unregister(health_sessiond); |
76d7553f | 1316 | DBG("consumer thread cleanup completed"); |
0177d773 | 1317 | |
34c1e15a MD |
1318 | rcu_thread_offline(); |
1319 | rcu_unregister_thread(); | |
1320 | ||
5eb91c98 | 1321 | return NULL; |
099e26bd DG |
1322 | } |
1323 | ||
099e26bd | 1324 | /* |
81f04d5f JG |
1325 | * This thread receives application command sockets (FDs) on the |
1326 | * apps_cmd_pipe and waits (polls) on them until they are closed | |
1327 | * or an error occurs. | |
1328 | * | |
1329 | * At that point, it flushes the data (tracing and metadata) associated | |
1330 | * with this application and tears down ust app sessions and other | |
1331 | * associated data structures through ust_app_unregister(). | |
1332 | * | |
1333 | * Note that this thread never sends commands to the applications | |
1334 | * through the command sockets; it merely listens for hang-ups | |
1335 | * and errors on those sockets and cleans-up as they occur. | |
1d4b027a DG |
1336 | */ |
1337 | static void *thread_manage_apps(void *data) | |
099e26bd | 1338 | { |
139ac872 | 1339 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1340 | ssize_t size_ret; |
5eb91c98 | 1341 | uint32_t revents, nb_fd; |
5eb91c98 | 1342 | struct lttng_poll_event events; |
099e26bd DG |
1343 | |
1344 | DBG("[thread] Manage application started"); | |
1345 | ||
f6a9efaa DG |
1346 | rcu_register_thread(); |
1347 | rcu_thread_online(); | |
1348 | ||
6c71277b | 1349 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1350 | |
e547b070 | 1351 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1352 | goto error_testpoint; |
1353 | } | |
1354 | ||
840cb59c | 1355 | health_code_update(); |
44a5e5eb | 1356 | |
d0b96690 | 1357 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1358 | if (ret < 0) { |
76d7553f | 1359 | goto error_poll_create; |
5eb91c98 | 1360 | } |
099e26bd | 1361 | |
5eb91c98 DG |
1362 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1363 | if (ret < 0) { | |
1364 | goto error; | |
1365 | } | |
099e26bd | 1366 | |
e547b070 | 1367 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1368 | goto error; |
1369 | } | |
8ac94142 | 1370 | |
840cb59c | 1371 | health_code_update(); |
44a5e5eb | 1372 | |
5eb91c98 | 1373 | while (1) { |
7fa2082e | 1374 | DBG("Apps thread polling"); |
099e26bd DG |
1375 | |
1376 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1377 | restart: |
a78af745 | 1378 | health_poll_entry(); |
5eb91c98 | 1379 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1380 | DBG("Apps thread return from poll on %d fds", |
1381 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1382 | health_poll_exit(); |
099e26bd | 1383 | if (ret < 0) { |
88f2b785 MD |
1384 | /* |
1385 | * Restart interrupted system call. | |
1386 | */ | |
1387 | if (errno == EINTR) { | |
1388 | goto restart; | |
1389 | } | |
099e26bd DG |
1390 | goto error; |
1391 | } | |
1392 | ||
0d9c5d77 DG |
1393 | nb_fd = ret; |
1394 | ||
5eb91c98 DG |
1395 | for (i = 0; i < nb_fd; i++) { |
1396 | /* Fetch once the poll data */ | |
1397 | revents = LTTNG_POLL_GETEV(&events, i); | |
1398 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1399 | ||
840cb59c | 1400 | health_code_update(); |
44a5e5eb | 1401 | |
fd20dac9 MD |
1402 | if (!revents) { |
1403 | /* No activity for this FD (poll implementation). */ | |
1404 | continue; | |
1405 | } | |
1406 | ||
5eb91c98 | 1407 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1408 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1409 | if (ret) { |
139ac872 MD |
1410 | err = 0; |
1411 | goto exit; | |
5eb91c98 | 1412 | } |
099e26bd | 1413 | |
5eb91c98 DG |
1414 | /* Inspect the apps cmd pipe */ |
1415 | if (pollfd == apps_cmd_pipe[0]) { | |
03e43155 | 1416 | if (revents & LPOLLIN) { |
d0b96690 DG |
1417 | int sock; |
1418 | ||
5eb91c98 | 1419 | /* Empty pipe */ |
6cd525e8 MD |
1420 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1421 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1422 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1423 | goto error; |
1424 | } | |
099e26bd | 1425 | |
840cb59c | 1426 | health_code_update(); |
44a5e5eb | 1427 | |
ffe60014 | 1428 | /* |
03e43155 MD |
1429 | * Since this is a command socket (write then read), |
1430 | * we only monitor the error events of the socket. | |
ffe60014 | 1431 | */ |
d0b96690 DG |
1432 | ret = lttng_poll_add(&events, sock, |
1433 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1434 | if (ret < 0) { | |
5eb91c98 | 1435 | goto error; |
e0c7ec2b | 1436 | } |
acc7b41b | 1437 | |
d0b96690 | 1438 | DBG("Apps with sock %d added to poll set", sock); |
03e43155 MD |
1439 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1440 | ERR("Apps command pipe error"); | |
1441 | goto error; | |
1442 | } else { | |
1443 | ERR("Unknown poll events %u for sock %d", revents, pollfd); | |
1444 | goto error; | |
0177d773 | 1445 | } |
5eb91c98 DG |
1446 | } else { |
1447 | /* | |
54d01ffb DG |
1448 | * At this point, we know that a registered application made |
1449 | * the event at poll_wait. | |
5eb91c98 DG |
1450 | */ |
1451 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1452 | /* Removing from the poll set */ | |
1453 | ret = lttng_poll_del(&events, pollfd); | |
1454 | if (ret < 0) { | |
1455 | goto error; | |
1456 | } | |
099e26bd | 1457 | |
b9d9b220 | 1458 | /* Socket closed on remote end. */ |
56fff090 | 1459 | ust_app_unregister(pollfd); |
03e43155 MD |
1460 | } else { |
1461 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1462 | goto error; | |
5eb91c98 | 1463 | } |
099e26bd | 1464 | } |
44a5e5eb | 1465 | |
840cb59c | 1466 | health_code_update(); |
099e26bd | 1467 | } |
099e26bd DG |
1468 | } |
1469 | ||
139ac872 | 1470 | exit: |
099e26bd | 1471 | error: |
5eb91c98 | 1472 | lttng_poll_clean(&events); |
76d7553f | 1473 | error_poll_create: |
6993eeb3 | 1474 | error_testpoint: |
6620da75 DG |
1475 | utils_close_pipe(apps_cmd_pipe); |
1476 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1477 | ||
1478 | /* | |
1479 | * We don't clean the UST app hash table here since already registered | |
1480 | * applications can still be controlled so let them be until the session | |
1481 | * daemon dies or the applications stop. | |
1482 | */ | |
1483 | ||
139ac872 | 1484 | if (err) { |
840cb59c | 1485 | health_error(); |
139ac872 MD |
1486 | ERR("Health error occurred in %s", __func__); |
1487 | } | |
8782cc74 | 1488 | health_unregister(health_sessiond); |
76d7553f | 1489 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1490 | rcu_thread_offline(); |
1491 | rcu_unregister_thread(); | |
099e26bd DG |
1492 | return NULL; |
1493 | } | |
1494 | ||
d0b96690 | 1495 | /* |
d88aee68 DG |
1496 | * Send a socket to a thread This is called from the dispatch UST registration |
1497 | * thread once all sockets are set for the application. | |
d0b96690 | 1498 | * |
b85dc84c DG |
1499 | * The sock value can be invalid, we don't really care, the thread will handle |
1500 | * it and make the necessary cleanup if so. | |
1501 | * | |
d0b96690 DG |
1502 | * On success, return 0 else a negative value being the errno message of the |
1503 | * write(). | |
1504 | */ | |
d88aee68 | 1505 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1506 | { |
6cd525e8 | 1507 | ssize_t ret; |
d0b96690 | 1508 | |
b85dc84c DG |
1509 | /* |
1510 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1511 | * before calling this function being a shutdown state of the thread. | |
1512 | */ | |
1513 | if (fd < 0) { | |
1514 | ret = -EBADF; | |
1515 | goto error; | |
1516 | } | |
d0b96690 | 1517 | |
6cd525e8 MD |
1518 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1519 | if (ret < sizeof(sock)) { | |
d88aee68 | 1520 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1521 | if (ret < 0) { |
1522 | ret = -errno; | |
1523 | } | |
1524 | goto error; | |
1525 | } | |
1526 | ||
1527 | /* All good. Don't send back the write positive ret value. */ | |
1528 | ret = 0; | |
1529 | error: | |
6cd525e8 | 1530 | return (int) ret; |
d0b96690 DG |
1531 | } |
1532 | ||
f45e313d DG |
1533 | /* |
1534 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1535 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1536 | * notify socket is never received. | |
1537 | */ | |
1538 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1539 | { | |
1540 | int ret, nb_fd = 0, i; | |
1541 | unsigned int fd_added = 0; | |
1542 | struct lttng_poll_event events; | |
1543 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1544 | ||
1545 | assert(wait_queue); | |
1546 | ||
1547 | lttng_poll_init(&events); | |
1548 | ||
1549 | /* Just skip everything for an empty queue. */ | |
1550 | if (!wait_queue->count) { | |
1551 | goto end; | |
1552 | } | |
1553 | ||
1554 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1555 | if (ret < 0) { | |
1556 | goto error_create; | |
1557 | } | |
1558 | ||
1559 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1560 | &wait_queue->head, head) { | |
1561 | assert(wait_node->app); | |
1562 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1563 | LPOLLHUP | LPOLLERR); | |
1564 | if (ret < 0) { | |
1565 | goto error; | |
1566 | } | |
1567 | ||
1568 | fd_added = 1; | |
1569 | } | |
1570 | ||
1571 | if (!fd_added) { | |
1572 | goto end; | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * Poll but don't block so we can quickly identify the faulty events and | |
1577 | * clean them afterwards from the wait queue. | |
1578 | */ | |
1579 | ret = lttng_poll_wait(&events, 0); | |
1580 | if (ret < 0) { | |
1581 | goto error; | |
1582 | } | |
1583 | nb_fd = ret; | |
1584 | ||
1585 | for (i = 0; i < nb_fd; i++) { | |
1586 | /* Get faulty FD. */ | |
1587 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1588 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1589 | ||
fd20dac9 MD |
1590 | if (!revents) { |
1591 | /* No activity for this FD (poll implementation). */ | |
1592 | continue; | |
1593 | } | |
1594 | ||
f45e313d DG |
1595 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1596 | &wait_queue->head, head) { | |
1597 | if (pollfd == wait_node->app->sock && | |
1598 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1599 | cds_list_del(&wait_node->head); | |
1600 | wait_queue->count--; | |
1601 | ust_app_destroy(wait_node->app); | |
1602 | free(wait_node); | |
48b40bcf JG |
1603 | /* |
1604 | * Silence warning of use-after-free in | |
1605 | * cds_list_for_each_entry_safe which uses | |
1606 | * __typeof__(*wait_node). | |
1607 | */ | |
1608 | wait_node = NULL; | |
f45e313d | 1609 | break; |
03e43155 MD |
1610 | } else { |
1611 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1612 | goto error; | |
f45e313d DG |
1613 | } |
1614 | } | |
1615 | } | |
1616 | ||
1617 | if (nb_fd > 0) { | |
1618 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1619 | } | |
1620 | ||
1621 | end: | |
1622 | lttng_poll_clean(&events); | |
1623 | return; | |
1624 | ||
1625 | error: | |
1626 | lttng_poll_clean(&events); | |
1627 | error_create: | |
1628 | ERR("Unable to sanitize wait queue"); | |
1629 | return; | |
1630 | } | |
1631 | ||
099e26bd DG |
1632 | /* |
1633 | * Dispatch request from the registration threads to the application | |
1634 | * communication thread. | |
1635 | */ | |
1636 | static void *thread_dispatch_ust_registration(void *data) | |
1637 | { | |
12e2b881 | 1638 | int ret, err = -1; |
8bdee6e2 | 1639 | struct cds_wfcq_node *node; |
099e26bd | 1640 | struct ust_command *ust_cmd = NULL; |
f45e313d DG |
1641 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1642 | struct ust_reg_wait_queue wait_queue = { | |
1643 | .count = 0, | |
1644 | }; | |
d0b96690 | 1645 | |
967e3668 MD |
1646 | rcu_register_thread(); |
1647 | ||
6c71277b | 1648 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1649 | |
9ad42ec1 MD |
1650 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1651 | goto error_testpoint; | |
1652 | } | |
1653 | ||
12e2b881 MD |
1654 | health_code_update(); |
1655 | ||
f45e313d | 1656 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1657 | |
1658 | DBG("[thread] Dispatch UST command started"); | |
1659 | ||
0ed3b1a8 | 1660 | for (;;) { |
12e2b881 MD |
1661 | health_code_update(); |
1662 | ||
099e26bd DG |
1663 | /* Atomically prepare the queue futex */ |
1664 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1665 | ||
0ed3b1a8 MD |
1666 | if (CMM_LOAD_SHARED(dispatch_thread_exit)) { |
1667 | break; | |
1668 | } | |
1669 | ||
099e26bd | 1670 | do { |
d0b96690 | 1671 | struct ust_app *app = NULL; |
7972aab2 | 1672 | ust_cmd = NULL; |
d0b96690 | 1673 | |
f45e313d DG |
1674 | /* |
1675 | * Make sure we don't have node(s) that have hung up before receiving | |
1676 | * the notify socket. This is to clean the list in order to avoid | |
1677 | * memory leaks from notify socket that are never seen. | |
1678 | */ | |
1679 | sanitize_wait_queue(&wait_queue); | |
1680 | ||
12e2b881 | 1681 | health_code_update(); |
099e26bd | 1682 | /* Dequeue command for registration */ |
8bdee6e2 | 1683 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 1684 | if (node == NULL) { |
00a17c97 | 1685 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1686 | /* Continue thread execution */ |
1687 | break; | |
1688 | } | |
1689 | ||
1690 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1691 | ||
2f50c8a3 DG |
1692 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1693 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1694 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1695 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1696 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1697 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1698 | |
1699 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1700 | wait_node = zmalloc(sizeof(*wait_node)); | |
1701 | if (!wait_node) { | |
1702 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1703 | ret = close(ust_cmd->sock); |
1704 | if (ret < 0) { | |
1705 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1706 | } | |
51dec90d | 1707 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1708 | free(ust_cmd); |
d0b96690 DG |
1709 | goto error; |
1710 | } | |
1711 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1712 | ||
1713 | /* Create application object if socket is CMD. */ | |
1714 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1715 | ust_cmd->sock); | |
1716 | if (!wait_node->app) { | |
1717 | ret = close(ust_cmd->sock); | |
1718 | if (ret < 0) { | |
1719 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1720 | } |
51dec90d | 1721 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1722 | free(wait_node); |
7972aab2 | 1723 | free(ust_cmd); |
d0b96690 DG |
1724 | continue; |
1725 | } | |
1726 | /* | |
1727 | * Add application to the wait queue so we can set the notify | |
1728 | * socket before putting this object in the global ht. | |
1729 | */ | |
f45e313d DG |
1730 | cds_list_add(&wait_node->head, &wait_queue.head); |
1731 | wait_queue.count++; | |
d0b96690 | 1732 | |
7972aab2 | 1733 | free(ust_cmd); |
d0b96690 DG |
1734 | /* |
1735 | * We have to continue here since we don't have the notify | |
1736 | * socket and the application MUST be added to the hash table | |
1737 | * only at that moment. | |
1738 | */ | |
1739 | continue; | |
1740 | } else { | |
1741 | /* | |
1742 | * Look for the application in the local wait queue and set the | |
1743 | * notify socket if found. | |
1744 | */ | |
d88aee68 | 1745 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1746 | &wait_queue.head, head) { |
12e2b881 | 1747 | health_code_update(); |
d0b96690 DG |
1748 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1749 | wait_node->app->notify_sock = ust_cmd->sock; | |
1750 | cds_list_del(&wait_node->head); | |
f45e313d | 1751 | wait_queue.count--; |
d0b96690 DG |
1752 | app = wait_node->app; |
1753 | free(wait_node); | |
1754 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1755 | break; | |
1756 | } | |
1757 | } | |
020d7f60 DG |
1758 | |
1759 | /* | |
1760 | * With no application at this stage the received socket is | |
1761 | * basically useless so close it before we free the cmd data | |
1762 | * structure for good. | |
1763 | */ | |
1764 | if (!app) { | |
1765 | ret = close(ust_cmd->sock); | |
1766 | if (ret < 0) { | |
1767 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1768 | } | |
51dec90d | 1769 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1770 | } |
7972aab2 | 1771 | free(ust_cmd); |
d0b96690 DG |
1772 | } |
1773 | ||
1774 | if (app) { | |
d0b96690 DG |
1775 | /* |
1776 | * @session_lock_list | |
1777 | * | |
1778 | * Lock the global session list so from the register up to the | |
1779 | * registration done message, no thread can see the application | |
1780 | * and change its state. | |
1781 | */ | |
1782 | session_lock_list(); | |
1783 | rcu_read_lock(); | |
d88aee68 | 1784 | |
d0b96690 DG |
1785 | /* |
1786 | * Add application to the global hash table. This needs to be | |
1787 | * done before the update to the UST registry can locate the | |
1788 | * application. | |
1789 | */ | |
1790 | ust_app_add(app); | |
d88aee68 DG |
1791 | |
1792 | /* Set app version. This call will print an error if needed. */ | |
1793 | (void) ust_app_version(app); | |
1794 | ||
1795 | /* Send notify socket through the notify pipe. */ | |
1796 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1797 | app->notify_sock); | |
1798 | if (ret < 0) { | |
1799 | rcu_read_unlock(); | |
1800 | session_unlock_list(); | |
b85dc84c DG |
1801 | /* |
1802 | * No notify thread, stop the UST tracing. However, this is | |
1803 | * not an internal error of the this thread thus setting | |
1804 | * the health error code to a normal exit. | |
1805 | */ | |
1806 | err = 0; | |
d88aee68 | 1807 | goto error; |
6620da75 | 1808 | } |
d88aee68 | 1809 | |
d0b96690 DG |
1810 | /* |
1811 | * Update newly registered application with the tracing | |
1812 | * registry info already enabled information. | |
1813 | */ | |
1814 | update_ust_app(app->sock); | |
d88aee68 DG |
1815 | |
1816 | /* | |
1817 | * Don't care about return value. Let the manage apps threads | |
1818 | * handle app unregistration upon socket close. | |
1819 | */ | |
fb45065e | 1820 | (void) ust_app_register_done(app); |
d88aee68 DG |
1821 | |
1822 | /* | |
1823 | * Even if the application socket has been closed, send the app | |
1824 | * to the thread and unregistration will take place at that | |
1825 | * place. | |
1826 | */ | |
1827 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1828 | if (ret < 0) { |
d88aee68 DG |
1829 | rcu_read_unlock(); |
1830 | session_unlock_list(); | |
b85dc84c DG |
1831 | /* |
1832 | * No apps. thread, stop the UST tracing. However, this is | |
1833 | * not an internal error of the this thread thus setting | |
1834 | * the health error code to a normal exit. | |
1835 | */ | |
1836 | err = 0; | |
d88aee68 | 1837 | goto error; |
d0b96690 | 1838 | } |
d88aee68 | 1839 | |
d0b96690 DG |
1840 | rcu_read_unlock(); |
1841 | session_unlock_list(); | |
099e26bd | 1842 | } |
099e26bd DG |
1843 | } while (node != NULL); |
1844 | ||
12e2b881 | 1845 | health_poll_entry(); |
099e26bd DG |
1846 | /* Futex wait on queue. Blocking call on futex() */ |
1847 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1848 | health_poll_exit(); |
099e26bd | 1849 | } |
12e2b881 MD |
1850 | /* Normal exit, no error */ |
1851 | err = 0; | |
099e26bd DG |
1852 | |
1853 | error: | |
d88aee68 DG |
1854 | /* Clean up wait queue. */ |
1855 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1856 | &wait_queue.head, head) { |
d88aee68 | 1857 | cds_list_del(&wait_node->head); |
f45e313d | 1858 | wait_queue.count--; |
d88aee68 DG |
1859 | free(wait_node); |
1860 | } | |
1861 | ||
772b8f4d MD |
1862 | /* Empty command queue. */ |
1863 | for (;;) { | |
1864 | /* Dequeue command for registration */ | |
1865 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); | |
1866 | if (node == NULL) { | |
1867 | break; | |
1868 | } | |
1869 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1870 | ret = close(ust_cmd->sock); | |
1871 | if (ret < 0) { | |
1872 | PERROR("close ust sock exit dispatch %d", ust_cmd->sock); | |
1873 | } | |
1874 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1875 | free(ust_cmd); | |
1876 | } | |
1877 | ||
9ad42ec1 | 1878 | error_testpoint: |
099e26bd | 1879 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1880 | if (err) { |
1881 | health_error(); | |
1882 | ERR("Health error occurred in %s", __func__); | |
1883 | } | |
8782cc74 | 1884 | health_unregister(health_sessiond); |
967e3668 | 1885 | rcu_unregister_thread(); |
099e26bd DG |
1886 | return NULL; |
1887 | } | |
1888 | ||
1889 | /* | |
1890 | * This thread manage application registration. | |
1891 | */ | |
1892 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1893 | { |
139ac872 | 1894 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1895 | uint32_t revents, nb_fd; |
1896 | struct lttng_poll_event events; | |
099e26bd DG |
1897 | /* |
1898 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1899 | * freed in the manage apps thread. | |
1900 | */ | |
1901 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1902 | |
099e26bd | 1903 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1904 | |
6c71277b | 1905 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 1906 | |
e547b070 | 1907 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
1908 | goto error_testpoint; |
1909 | } | |
8ac94142 | 1910 | |
1d4b027a DG |
1911 | ret = lttcomm_listen_unix_sock(apps_sock); |
1912 | if (ret < 0) { | |
76d7553f | 1913 | goto error_listen; |
1d4b027a DG |
1914 | } |
1915 | ||
5eb91c98 DG |
1916 | /* |
1917 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1918 | * more will be added to this poll set. | |
1919 | */ | |
d0b96690 | 1920 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1921 | if (ret < 0) { |
76d7553f | 1922 | goto error_create_poll; |
5eb91c98 | 1923 | } |
273ea72c | 1924 | |
5eb91c98 DG |
1925 | /* Add the application registration socket */ |
1926 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1927 | if (ret < 0) { | |
76d7553f | 1928 | goto error_poll_add; |
5eb91c98 | 1929 | } |
273ea72c | 1930 | |
1d4b027a | 1931 | /* Notify all applications to register */ |
0fdd1e2c DG |
1932 | ret = notify_ust_apps(1); |
1933 | if (ret < 0) { | |
1934 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1935 | "Execution continues but there might be problem for already\n" |
1936 | "running applications that wishes to register."); | |
0fdd1e2c | 1937 | } |
1d4b027a DG |
1938 | |
1939 | while (1) { | |
1940 | DBG("Accepting application registration"); | |
273ea72c DG |
1941 | |
1942 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1943 | restart: |
a78af745 | 1944 | health_poll_entry(); |
5eb91c98 | 1945 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1946 | health_poll_exit(); |
273ea72c | 1947 | if (ret < 0) { |
88f2b785 MD |
1948 | /* |
1949 | * Restart interrupted system call. | |
1950 | */ | |
1951 | if (errno == EINTR) { | |
1952 | goto restart; | |
1953 | } | |
273ea72c DG |
1954 | goto error; |
1955 | } | |
1956 | ||
0d9c5d77 DG |
1957 | nb_fd = ret; |
1958 | ||
5eb91c98 | 1959 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1960 | health_code_update(); |
139ac872 | 1961 | |
5eb91c98 DG |
1962 | /* Fetch once the poll data */ |
1963 | revents = LTTNG_POLL_GETEV(&events, i); | |
1964 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1965 | |
fd20dac9 MD |
1966 | if (!revents) { |
1967 | /* No activity for this FD (poll implementation). */ | |
1968 | continue; | |
1969 | } | |
1970 | ||
5eb91c98 | 1971 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1972 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1973 | if (ret) { |
139ac872 MD |
1974 | err = 0; |
1975 | goto exit; | |
90014c57 | 1976 | } |
1d4b027a | 1977 | |
5eb91c98 DG |
1978 | /* Event on the registration socket */ |
1979 | if (pollfd == apps_sock) { | |
03e43155 | 1980 | if (revents & LPOLLIN) { |
5eb91c98 DG |
1981 | sock = lttcomm_accept_unix_sock(apps_sock); |
1982 | if (sock < 0) { | |
1983 | goto error; | |
1984 | } | |
099e26bd | 1985 | |
16c5c8fa DG |
1986 | /* |
1987 | * Set socket timeout for both receiving and ending. | |
1988 | * app_socket_timeout is in seconds, whereas | |
1989 | * lttcomm_setsockopt_rcv_timeout and | |
1990 | * lttcomm_setsockopt_snd_timeout expect msec as | |
1991 | * parameter. | |
1992 | */ | |
e6142f2e | 1993 | if (config.app_socket_timeout >= 0) { |
28ce0ff2 | 1994 | (void) lttcomm_setsockopt_rcv_timeout(sock, |
e6142f2e | 1995 | config.app_socket_timeout * 1000); |
28ce0ff2 | 1996 | (void) lttcomm_setsockopt_snd_timeout(sock, |
e6142f2e | 1997 | config.app_socket_timeout * 1000); |
28ce0ff2 | 1998 | } |
16c5c8fa | 1999 | |
b662582b DG |
2000 | /* |
2001 | * Set the CLOEXEC flag. Return code is useless because | |
2002 | * either way, the show must go on. | |
2003 | */ | |
2004 | (void) utils_set_fd_cloexec(sock); | |
2005 | ||
5eb91c98 | 2006 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 2007 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 2008 | if (ust_cmd == NULL) { |
76d7553f | 2009 | PERROR("ust command zmalloc"); |
41ed8e47 MD |
2010 | ret = close(sock); |
2011 | if (ret) { | |
2012 | PERROR("close"); | |
2013 | } | |
5eb91c98 DG |
2014 | goto error; |
2015 | } | |
1d4b027a | 2016 | |
5eb91c98 DG |
2017 | /* |
2018 | * Using message-based transmissions to ensure we don't | |
2019 | * have to deal with partially received messages. | |
2020 | */ | |
4063050c MD |
2021 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
2022 | if (ret < 0) { | |
2023 | ERR("Exhausted file descriptors allowed for applications."); | |
2024 | free(ust_cmd); | |
2025 | ret = close(sock); | |
2026 | if (ret) { | |
2027 | PERROR("close"); | |
2028 | } | |
2029 | sock = -1; | |
2030 | continue; | |
2031 | } | |
d88aee68 | 2032 | |
840cb59c | 2033 | health_code_update(); |
d0b96690 DG |
2034 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
2035 | if (ret < 0) { | |
5eb91c98 | 2036 | free(ust_cmd); |
d0b96690 | 2037 | /* Close socket of the application. */ |
76d7553f MD |
2038 | ret = close(sock); |
2039 | if (ret) { | |
2040 | PERROR("close"); | |
2041 | } | |
4063050c | 2042 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 2043 | sock = -1; |
5eb91c98 DG |
2044 | continue; |
2045 | } | |
840cb59c | 2046 | health_code_update(); |
099e26bd | 2047 | |
5eb91c98 | 2048 | ust_cmd->sock = sock; |
34a2494f | 2049 | sock = -1; |
099e26bd | 2050 | |
5eb91c98 DG |
2051 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2052 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2053 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2054 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2055 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2056 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2057 | |
5eb91c98 DG |
2058 | /* |
2059 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2060 | * has been taken! This apps will be part of the *system*. |
5eb91c98 | 2061 | */ |
8bdee6e2 | 2062 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
5eb91c98 DG |
2063 | |
2064 | /* | |
2065 | * Wake the registration queue futex. Implicit memory | |
8bdee6e2 | 2066 | * barrier with the exchange in cds_wfcq_enqueue. |
5eb91c98 DG |
2067 | */ |
2068 | futex_nto1_wake(&ust_cmd_queue.futex); | |
03e43155 MD |
2069 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2070 | ERR("Register apps socket poll error"); | |
2071 | goto error; | |
2072 | } else { | |
2073 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2074 | goto error; | |
5eb91c98 DG |
2075 | } |
2076 | } | |
90014c57 | 2077 | } |
1d4b027a DG |
2078 | } |
2079 | ||
139ac872 | 2080 | exit: |
1d4b027a | 2081 | error: |
0fdd1e2c DG |
2082 | /* Notify that the registration thread is gone */ |
2083 | notify_ust_apps(0); | |
2084 | ||
a4b35e07 | 2085 | if (apps_sock >= 0) { |
76d7553f MD |
2086 | ret = close(apps_sock); |
2087 | if (ret) { | |
2088 | PERROR("close"); | |
2089 | } | |
a4b35e07 | 2090 | } |
46c3f085 | 2091 | if (sock >= 0) { |
76d7553f MD |
2092 | ret = close(sock); |
2093 | if (ret) { | |
2094 | PERROR("close"); | |
2095 | } | |
4063050c | 2096 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2097 | } |
e6142f2e | 2098 | unlink(config.apps_unix_sock_path.value); |
0fdd1e2c | 2099 | |
76d7553f | 2100 | error_poll_add: |
5eb91c98 | 2101 | lttng_poll_clean(&events); |
76d7553f MD |
2102 | error_listen: |
2103 | error_create_poll: | |
6993eeb3 | 2104 | error_testpoint: |
76d7553f | 2105 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2106 | if (err) { |
2107 | health_error(); | |
2108 | ERR("Health error occurred in %s", __func__); | |
2109 | } | |
8782cc74 | 2110 | health_unregister(health_sessiond); |
5eb91c98 | 2111 | |
1d4b027a DG |
2112 | return NULL; |
2113 | } | |
2114 | ||
8c0faa1d | 2115 | /* |
3bd1e081 | 2116 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2117 | * exec or it will fails. |
8c0faa1d | 2118 | */ |
3bd1e081 | 2119 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2120 | { |
a23ec3a7 | 2121 | int ret, clock_ret; |
ee0b0061 DG |
2122 | struct timespec timeout; |
2123 | ||
13a7bce3 JG |
2124 | /* |
2125 | * Make sure we set the readiness flag to 0 because we are NOT ready. | |
2126 | * This access to consumer_thread_is_ready does not need to be | |
2127 | * protected by consumer_data.cond_mutex (yet) since the consumer | |
2128 | * management thread has not been started at this point. | |
2129 | */ | |
a23ec3a7 | 2130 | consumer_data->consumer_thread_is_ready = 0; |
8c0faa1d | 2131 | |
a23ec3a7 DG |
2132 | /* Setup pthread condition */ |
2133 | ret = pthread_condattr_init(&consumer_data->condattr); | |
4a15001e | 2134 | if (ret) { |
a23ec3a7 DG |
2135 | errno = ret; |
2136 | PERROR("pthread_condattr_init consumer data"); | |
2137 | goto error; | |
2138 | } | |
2139 | ||
2140 | /* | |
2141 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2142 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2143 | * for a more details and how we noticed it. | |
2144 | */ | |
2145 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
4a15001e | 2146 | if (ret) { |
a23ec3a7 DG |
2147 | errno = ret; |
2148 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2149 | goto error; |
2150 | } | |
8c0faa1d | 2151 | |
a23ec3a7 | 2152 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
4a15001e | 2153 | if (ret) { |
a23ec3a7 DG |
2154 | errno = ret; |
2155 | PERROR("pthread_cond_init consumer data"); | |
2156 | goto error; | |
2157 | } | |
2158 | ||
1a1a34b4 MJ |
2159 | ret = pthread_create(&consumer_data->thread, default_pthread_attr(), |
2160 | thread_manage_consumer, consumer_data); | |
4a15001e MD |
2161 | if (ret) { |
2162 | errno = ret; | |
3bd1e081 | 2163 | PERROR("pthread_create consumer"); |
ee0b0061 | 2164 | ret = -1; |
8c0faa1d DG |
2165 | goto error; |
2166 | } | |
2167 | ||
a23ec3a7 DG |
2168 | /* We are about to wait on a pthread condition */ |
2169 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2170 | ||
ee0b0061 | 2171 | /* Get time for sem_timedwait absolute timeout */ |
389fbf04 | 2172 | clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout); |
a23ec3a7 DG |
2173 | /* |
2174 | * Set the timeout for the condition timed wait even if the clock gettime | |
2175 | * call fails since we might loop on that call and we want to avoid to | |
2176 | * increment the timeout too many times. | |
2177 | */ | |
2178 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2179 | ||
2180 | /* | |
2181 | * The following loop COULD be skipped in some conditions so this is why we | |
2182 | * set ret to 0 in order to make sure at least one round of the loop is | |
2183 | * done. | |
2184 | */ | |
2185 | ret = 0; | |
2186 | ||
2187 | /* | |
2188 | * Loop until the condition is reached or when a timeout is reached. Note | |
2189 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2190 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2191 | * possible. This loop does not take any chances and works with both of | |
2192 | * them. | |
2193 | */ | |
2194 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2195 | if (clock_ret < 0) { | |
2196 | PERROR("clock_gettime spawn consumer"); | |
2197 | /* Infinite wait for the consumerd thread to be ready */ | |
2198 | ret = pthread_cond_wait(&consumer_data->cond, | |
2199 | &consumer_data->cond_mutex); | |
2200 | } else { | |
2201 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2202 | &consumer_data->cond_mutex, &timeout); | |
2203 | } | |
ee0b0061 | 2204 | } |
8c0faa1d | 2205 | |
a23ec3a7 DG |
2206 | /* Release the pthread condition */ |
2207 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2208 | ||
2209 | if (ret != 0) { | |
2210 | errno = ret; | |
2211 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2212 | int pth_ret; |
2213 | ||
ee0b0061 DG |
2214 | /* |
2215 | * Call has timed out so we kill the kconsumerd_thread and return | |
2216 | * an error. | |
2217 | */ | |
a23ec3a7 DG |
2218 | ERR("Condition timed out. The consumer thread was never ready." |
2219 | " Killing it"); | |
4282f9a3 DG |
2220 | pth_ret = pthread_cancel(consumer_data->thread); |
2221 | if (pth_ret < 0) { | |
3bd1e081 | 2222 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2223 | } |
2224 | } else { | |
a23ec3a7 | 2225 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2226 | } |
4282f9a3 DG |
2227 | /* Caller is expecting a negative value on failure. */ |
2228 | ret = -1; | |
ee0b0061 DG |
2229 | goto error; |
2230 | } | |
2231 | ||
3bd1e081 MD |
2232 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2233 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2234 | ERR("Consumerd did not start"); |
3bd1e081 | 2235 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2236 | goto error; |
2237 | } | |
3bd1e081 | 2238 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2239 | |
8c0faa1d DG |
2240 | return 0; |
2241 | ||
2242 | error: | |
2243 | return ret; | |
2244 | } | |
2245 | ||
d9800920 | 2246 | /* |
3bd1e081 | 2247 | * Join consumer thread |
d9800920 | 2248 | */ |
3bd1e081 | 2249 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2250 | { |
2251 | void *status; | |
cf3af59e | 2252 | |
e8209f6b DG |
2253 | /* Consumer pid must be a real one. */ |
2254 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2255 | int ret; |
3bd1e081 | 2256 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2257 | if (ret) { |
4a15001e | 2258 | PERROR("Error killing consumer daemon"); |
cf3af59e MD |
2259 | return ret; |
2260 | } | |
3bd1e081 | 2261 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2262 | } else { |
2263 | return 0; | |
2264 | } | |
2265 | } | |
2266 | ||
8c0faa1d | 2267 | /* |
3bd1e081 | 2268 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2269 | * |
d063d709 | 2270 | * Return pid if successful else -1. |
8c0faa1d | 2271 | */ |
3bd1e081 | 2272 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2273 | { |
2274 | int ret; | |
2275 | pid_t pid; | |
94c55f17 | 2276 | const char *consumer_to_use; |
53086306 | 2277 | const char *verbosity; |
94c55f17 | 2278 | struct stat st; |
8c0faa1d | 2279 | |
3bd1e081 | 2280 | DBG("Spawning consumerd"); |
c49dc785 | 2281 | |
8c0faa1d DG |
2282 | pid = fork(); |
2283 | if (pid == 0) { | |
2284 | /* | |
3bd1e081 | 2285 | * Exec consumerd. |
8c0faa1d | 2286 | */ |
e6142f2e | 2287 | if (config.verbose_consumer) { |
53086306 | 2288 | verbosity = "--verbose"; |
4421f712 | 2289 | } else if (lttng_opt_quiet) { |
53086306 | 2290 | verbosity = "--quiet"; |
4421f712 DG |
2291 | } else { |
2292 | verbosity = ""; | |
53086306 | 2293 | } |
4421f712 | 2294 | |
3bd1e081 MD |
2295 | switch (consumer_data->type) { |
2296 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2297 | /* |
c7704d57 DG |
2298 | * Find out which consumerd to execute. We will first try the |
2299 | * 64-bit path, then the sessiond's installation directory, and | |
2300 | * fallback on the 32-bit one, | |
94c55f17 | 2301 | */ |
63a799e8 | 2302 | DBG3("Looking for a kernel consumer at these locations:"); |
59ee5091 | 2303 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); |
e6142f2e | 2304 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
59ee5091 | 2305 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); |
e6142f2e | 2306 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { |
63a799e8 | 2307 | DBG3("Found location #1"); |
e6142f2e JG |
2308 | consumer_to_use = config.consumerd64_bin_path.value; |
2309 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
63a799e8 | 2310 | DBG3("Found location #2"); |
e6142f2e | 2311 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; |
a1a9f823 JG |
2312 | } else if (config.consumerd32_bin_path.value && |
2313 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
63a799e8 | 2314 | DBG3("Found location #3"); |
e6142f2e | 2315 | consumer_to_use = config.consumerd32_bin_path.value; |
94c55f17 | 2316 | } else { |
63a799e8 | 2317 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2318 | ret = -EINVAL; |
3d678709 | 2319 | goto error; |
94c55f17 AM |
2320 | } |
2321 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
6e2cc8d8 | 2322 | (void) execl(consumer_to_use, |
94c55f17 AM |
2323 | "lttng-consumerd", verbosity, "-k", |
2324 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2325 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2326 | "--group", config.tracing_group_name.value, |
94c55f17 | 2327 | NULL); |
3bd1e081 | 2328 | break; |
7753dea8 MD |
2329 | case LTTNG_CONSUMER64_UST: |
2330 | { | |
46b23495 | 2331 | if (config.consumerd64_lib_dir.value) { |
8f4905da MD |
2332 | char *tmp; |
2333 | size_t tmplen; | |
ddaec4a2 | 2334 | char *tmpnew; |
8f4905da | 2335 | |
e8fa9fb0 | 2336 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2337 | if (!tmp) { |
2338 | tmp = ""; | |
2339 | } | |
d222983e | 2340 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2341 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2342 | if (!tmpnew) { | |
2343 | ret = -ENOMEM; | |
2344 | goto error; | |
2345 | } | |
e6142f2e | 2346 | strcat(tmpnew, config.consumerd64_lib_dir.value); |
8f4905da MD |
2347 | if (tmp[0] != '\0') { |
2348 | strcat(tmpnew, ":"); | |
2349 | strcat(tmpnew, tmp); | |
2350 | } | |
d222983e | 2351 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
ddaec4a2 | 2352 | free(tmpnew); |
8f4905da MD |
2353 | if (ret) { |
2354 | ret = -errno; | |
2355 | goto error; | |
2356 | } | |
2357 | } | |
e6142f2e JG |
2358 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); |
2359 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2360 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2361 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2362 | "--group", config.tracing_group_name.value, |
7753dea8 | 2363 | NULL); |
3bd1e081 | 2364 | break; |
7753dea8 MD |
2365 | } |
2366 | case LTTNG_CONSUMER32_UST: | |
2367 | { | |
46b23495 | 2368 | if (config.consumerd32_lib_dir.value) { |
8f4905da MD |
2369 | char *tmp; |
2370 | size_t tmplen; | |
ddaec4a2 | 2371 | char *tmpnew; |
8f4905da | 2372 | |
e8fa9fb0 | 2373 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2374 | if (!tmp) { |
2375 | tmp = ""; | |
2376 | } | |
d222983e | 2377 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2378 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2379 | if (!tmpnew) { | |
2380 | ret = -ENOMEM; | |
2381 | goto error; | |
2382 | } | |
e6142f2e | 2383 | strcat(tmpnew, config.consumerd32_lib_dir.value); |
8f4905da MD |
2384 | if (tmp[0] != '\0') { |
2385 | strcat(tmpnew, ":"); | |
2386 | strcat(tmpnew, tmp); | |
2387 | } | |
d222983e | 2388 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
ddaec4a2 | 2389 | free(tmpnew); |
8f4905da MD |
2390 | if (ret) { |
2391 | ret = -errno; | |
2392 | goto error; | |
2393 | } | |
2394 | } | |
e6142f2e JG |
2395 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); |
2396 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2397 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2398 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2399 | "--group", config.tracing_group_name.value, |
7753dea8 MD |
2400 | NULL); |
2401 | break; | |
2402 | } | |
3bd1e081 | 2403 | default: |
b60e7183 | 2404 | ERR("unknown consumer type"); |
e9d6b496 | 2405 | errno = 0; |
3bd1e081 | 2406 | } |
8c0faa1d | 2407 | if (errno != 0) { |
4282f9a3 | 2408 | PERROR("Consumer execl()"); |
8c0faa1d | 2409 | } |
4282f9a3 | 2410 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2411 | exit(EXIT_FAILURE); |
2412 | } else if (pid > 0) { | |
2413 | ret = pid; | |
8c0faa1d | 2414 | } else { |
76d7553f | 2415 | PERROR("start consumer fork"); |
8c0faa1d | 2416 | ret = -errno; |
8c0faa1d | 2417 | } |
8f4905da | 2418 | error: |
8c0faa1d DG |
2419 | return ret; |
2420 | } | |
2421 | ||
693bd40b | 2422 | /* |
3bd1e081 | 2423 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2424 | */ |
3bd1e081 | 2425 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2426 | { |
c617c0c6 | 2427 | int ret; |
edb8b045 DG |
2428 | |
2429 | /* | |
2430 | * Set the listen() state on the socket since there is a possible race | |
2431 | * between the exec() of the consumer daemon and this call if place in the | |
2432 | * consumer thread. See bug #366 for more details. | |
2433 | */ | |
2434 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2435 | if (ret < 0) { | |
2436 | goto error; | |
2437 | } | |
693bd40b | 2438 | |
3bd1e081 MD |
2439 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2440 | if (consumer_data->pid != 0) { | |
2441 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2442 | goto end; |
2443 | } | |
693bd40b | 2444 | |
3bd1e081 | 2445 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2446 | if (ret < 0) { |
3bd1e081 MD |
2447 | ERR("Spawning consumerd failed"); |
2448 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2449 | goto error; |
693bd40b | 2450 | } |
c49dc785 | 2451 | |
3bd1e081 MD |
2452 | /* Setting up the consumer_data pid */ |
2453 | consumer_data->pid = ret; | |
48842b30 | 2454 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2455 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2456 | |
3bd1e081 MD |
2457 | DBG2("Spawning consumer control thread"); |
2458 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2459 | if (ret < 0) { |
3bd1e081 | 2460 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2461 | goto error; |
2462 | } | |
2463 | ||
c49dc785 | 2464 | end: |
693bd40b DG |
2465 | return 0; |
2466 | ||
2467 | error: | |
331744e3 | 2468 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2469 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2470 | int err; |
2471 | ||
edb8b045 DG |
2472 | err = close(consumer_data->err_sock); |
2473 | if (err < 0) { | |
2474 | PERROR("close consumer data error socket"); | |
2475 | } | |
2476 | } | |
693bd40b DG |
2477 | return ret; |
2478 | } | |
2479 | ||
b73401da | 2480 | /* |
096102bd | 2481 | * Setup necessary data for kernel tracer action. |
b73401da | 2482 | */ |
096102bd | 2483 | static int init_kernel_tracer(void) |
b73401da DG |
2484 | { |
2485 | int ret; | |
b73401da | 2486 | |
096102bd DG |
2487 | /* Modprobe lttng kernel modules */ |
2488 | ret = modprobe_lttng_control(); | |
b73401da | 2489 | if (ret < 0) { |
b73401da DG |
2490 | goto error; |
2491 | } | |
2492 | ||
096102bd DG |
2493 | /* Open debugfs lttng */ |
2494 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2495 | if (kernel_tracer_fd < 0) { | |
2496 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b | 2497 | goto error_open; |
54d01ffb DG |
2498 | } |
2499 | ||
2f77fc4b | 2500 | /* Validate kernel version */ |
88076e89 JD |
2501 | ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version, |
2502 | &kernel_tracer_abi_version); | |
2f77fc4b DG |
2503 | if (ret < 0) { |
2504 | goto error_version; | |
b551a063 | 2505 | } |
54d01ffb | 2506 | |
2f77fc4b DG |
2507 | ret = modprobe_lttng_data(); |
2508 | if (ret < 0) { | |
2509 | goto error_modules; | |
54d01ffb DG |
2510 | } |
2511 | ||
6e21424e JR |
2512 | ret = kernel_supports_ring_buffer_snapshot_sample_positions( |
2513 | kernel_tracer_fd); | |
2514 | if (ret < 0) { | |
2515 | goto error_modules; | |
2516 | } | |
2517 | ||
2518 | if (ret < 1) { | |
2519 | WARN("Kernel tracer does not support buffer monitoring. " | |
2520 | "The monitoring timer of channels in the kernel domain " | |
2521 | "will be set to 0 (disabled)."); | |
2522 | } | |
2523 | ||
2f77fc4b DG |
2524 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2525 | return 0; | |
2526 | ||
2527 | error_version: | |
2528 | modprobe_remove_lttng_control(); | |
2529 | ret = close(kernel_tracer_fd); | |
2530 | if (ret) { | |
2531 | PERROR("close"); | |
b551a063 | 2532 | } |
2f77fc4b | 2533 | kernel_tracer_fd = -1; |
f73fabfd | 2534 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2535 | |
2f77fc4b DG |
2536 | error_modules: |
2537 | ret = close(kernel_tracer_fd); | |
2538 | if (ret) { | |
2539 | PERROR("close"); | |
b551a063 | 2540 | } |
54d01ffb | 2541 | |
2f77fc4b DG |
2542 | error_open: |
2543 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2544 | |
2545 | error: | |
2f77fc4b DG |
2546 | WARN("No kernel tracer available"); |
2547 | kernel_tracer_fd = -1; | |
2548 | if (!is_root) { | |
f73fabfd | 2549 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2550 | } else { |
f73fabfd | 2551 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2552 | } |
54d01ffb DG |
2553 | } |
2554 | ||
2f77fc4b | 2555 | |
54d01ffb | 2556 | /* |
2f77fc4b DG |
2557 | * Copy consumer output from the tracing session to the domain session. The |
2558 | * function also applies the right modification on a per domain basis for the | |
2559 | * trace files destination directory. | |
36b588ed MD |
2560 | * |
2561 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2562 | */ |
2f77fc4b | 2563 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2564 | { |
2565 | int ret; | |
2f77fc4b DG |
2566 | const char *dir_name; |
2567 | struct consumer_output *consumer; | |
2568 | ||
2569 | assert(session); | |
2570 | assert(session->consumer); | |
54d01ffb | 2571 | |
b551a063 DG |
2572 | switch (domain) { |
2573 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2574 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2575 | /* |
2576 | * XXX: We should audit the session creation and what this function | |
2577 | * does "extra" in order to avoid a destroy since this function is used | |
2578 | * in the domain session creation (kernel and ust) only. Same for UST | |
2579 | * domain. | |
2580 | */ | |
2581 | if (session->kernel_session->consumer) { | |
6addfa37 | 2582 | consumer_output_put(session->kernel_session->consumer); |
09a90bcd | 2583 | } |
2f77fc4b DG |
2584 | session->kernel_session->consumer = |
2585 | consumer_copy_output(session->consumer); | |
2586 | /* Ease our life a bit for the next part */ | |
2587 | consumer = session->kernel_session->consumer; | |
2588 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2589 | break; |
f20baf8e | 2590 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2591 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2592 | case LTTNG_DOMAIN_PYTHON: |
b551a063 | 2593 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2594 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd | 2595 | if (session->ust_session->consumer) { |
6addfa37 | 2596 | consumer_output_put(session->ust_session->consumer); |
09a90bcd | 2597 | } |
2f77fc4b DG |
2598 | session->ust_session->consumer = |
2599 | consumer_copy_output(session->consumer); | |
2600 | /* Ease our life a bit for the next part */ | |
2601 | consumer = session->ust_session->consumer; | |
2602 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2603 | break; |
2604 | default: | |
f73fabfd | 2605 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2606 | goto error; |
2607 | } | |
2608 | ||
2f77fc4b | 2609 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2610 | strncat(consumer->subdir, dir_name, |
2611 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2612 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2613 | ||
f73fabfd | 2614 | ret = LTTNG_OK; |
54d01ffb DG |
2615 | |
2616 | error: | |
2617 | return ret; | |
2618 | } | |
2619 | ||
00e2e675 | 2620 | /* |
2f77fc4b | 2621 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2622 | * |
2623 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2624 | */ |
2f77fc4b DG |
2625 | static int create_ust_session(struct ltt_session *session, |
2626 | struct lttng_domain *domain) | |
00e2e675 DG |
2627 | { |
2628 | int ret; | |
2f77fc4b | 2629 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2630 | |
a4b92340 | 2631 | assert(session); |
2f77fc4b DG |
2632 | assert(domain); |
2633 | assert(session->consumer); | |
a4b92340 | 2634 | |
2f77fc4b | 2635 | switch (domain->type) { |
f20baf8e | 2636 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2637 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2638 | case LTTNG_DOMAIN_PYTHON: |
2f77fc4b DG |
2639 | case LTTNG_DOMAIN_UST: |
2640 | break; | |
2641 | default: | |
2642 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2643 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2644 | goto error; |
2645 | } | |
2646 | ||
2f77fc4b DG |
2647 | DBG("Creating UST session"); |
2648 | ||
dec56f6c | 2649 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2650 | if (lus == NULL) { |
f73fabfd | 2651 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2652 | goto error; |
2653 | } | |
2654 | ||
2f77fc4b DG |
2655 | lus->uid = session->uid; |
2656 | lus->gid = session->gid; | |
2bba9e53 | 2657 | lus->output_traces = session->output_traces; |
27babd3a | 2658 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2659 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2660 | session->ust_session = lus; |
d7ba1388 | 2661 | if (session->shm_path[0]) { |
3d071855 MD |
2662 | strncpy(lus->root_shm_path, session->shm_path, |
2663 | sizeof(lus->root_shm_path)); | |
2664 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2665 | strncpy(lus->shm_path, session->shm_path, |
2666 | sizeof(lus->shm_path)); | |
2667 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
2668 | strncat(lus->shm_path, "/ust", | |
2669 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
2670 | } | |
2f77fc4b DG |
2671 | /* Copy session output to the newly created UST session */ |
2672 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2673 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2674 | goto error; |
2675 | } | |
2676 | ||
f73fabfd | 2677 | return LTTNG_OK; |
00e2e675 DG |
2678 | |
2679 | error: | |
2f77fc4b DG |
2680 | free(lus); |
2681 | session->ust_session = NULL; | |
00e2e675 DG |
2682 | return ret; |
2683 | } | |
2684 | ||
2685 | /* | |
2f77fc4b | 2686 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2687 | */ |
2f77fc4b | 2688 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2689 | { |
2690 | int ret; | |
a4b92340 | 2691 | |
2f77fc4b | 2692 | DBG("Creating kernel session"); |
00e2e675 | 2693 | |
2f77fc4b DG |
2694 | ret = kernel_create_session(session, kernel_tracer_fd); |
2695 | if (ret < 0) { | |
f73fabfd | 2696 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2697 | goto error; |
2698 | } | |
2699 | ||
2f77fc4b DG |
2700 | /* Code flow safety */ |
2701 | assert(session->kernel_session); | |
2702 | ||
2703 | /* Copy session output to the newly created Kernel session */ | |
2704 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2705 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2706 | goto error; |
2707 | } | |
2708 | ||
2f77fc4b DG |
2709 | session->kernel_session->uid = session->uid; |
2710 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2711 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2712 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2713 | |
f73fabfd | 2714 | return LTTNG_OK; |
00e2e675 | 2715 | |
2f77fc4b DG |
2716 | error: |
2717 | trace_kernel_destroy_session(session->kernel_session); | |
2718 | session->kernel_session = NULL; | |
2719 | return ret; | |
2720 | } | |
00e2e675 | 2721 | |
2f77fc4b DG |
2722 | /* |
2723 | * Count number of session permitted by uid/gid. | |
2724 | */ | |
2725 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2726 | { | |
2727 | unsigned int i = 0; | |
2728 | struct ltt_session *session; | |
e32d7f27 | 2729 | const struct ltt_session_list *session_list = session_get_list(); |
07424f16 | 2730 | |
2f77fc4b DG |
2731 | DBG("Counting number of available session for UID %d GID %d", |
2732 | uid, gid); | |
e32d7f27 JG |
2733 | cds_list_for_each_entry(session, &session_list->head, list) { |
2734 | if (!session_get(session)) { | |
2f77fc4b DG |
2735 | continue; |
2736 | } | |
e32d7f27 JG |
2737 | session_lock(session); |
2738 | /* Only count the sessions the user can control. */ | |
2739 | if (session_access_ok(session, uid, gid) && | |
2740 | !session->destroyed) { | |
2741 | i++; | |
2742 | } | |
2743 | session_unlock(session); | |
2744 | session_put(session); | |
a4b92340 | 2745 | } |
2f77fc4b | 2746 | return i; |
00e2e675 DG |
2747 | } |
2748 | ||
dcabc190 FD |
2749 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, |
2750 | int *sock_error, struct lttng_event *event) | |
2751 | { | |
2752 | int fd, ret; | |
2753 | struct lttng_userspace_probe_location *probe_location; | |
87597c2c | 2754 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
dcabc190 FD |
2755 | struct lttng_dynamic_buffer probe_location_buffer; |
2756 | struct lttng_buffer_view buffer_view; | |
2757 | ||
2758 | /* | |
2759 | * Create a buffer to store the serialized version of the probe | |
2760 | * location. | |
2761 | */ | |
2762 | lttng_dynamic_buffer_init(&probe_location_buffer); | |
2763 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, | |
2764 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); | |
2765 | if (ret) { | |
2766 | ret = LTTNG_ERR_NOMEM; | |
2767 | goto error; | |
2768 | } | |
2769 | ||
2770 | /* | |
2771 | * Receive the probe location. | |
2772 | */ | |
2773 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, | |
2774 | probe_location_buffer.size); | |
2775 | if (ret <= 0) { | |
2776 | DBG("Nothing recv() from client var len data... continuing"); | |
2777 | *sock_error = 1; | |
2778 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
2779 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2780 | goto error; | |
2781 | } | |
2782 | ||
2783 | buffer_view = lttng_buffer_view_from_dynamic_buffer( | |
2784 | &probe_location_buffer, 0, probe_location_buffer.size); | |
2785 | ||
2786 | /* | |
2787 | * Extract the probe location from the serialized version. | |
2788 | */ | |
2789 | ret = lttng_userspace_probe_location_create_from_buffer( | |
2790 | &buffer_view, &probe_location); | |
2791 | if (ret < 0) { | |
2792 | WARN("Failed to create a userspace probe location from the received buffer"); | |
2793 | lttng_dynamic_buffer_reset( &probe_location_buffer); | |
2794 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2795 | goto error; | |
2796 | } | |
2797 | ||
2798 | /* | |
2799 | * Receive the file descriptor to the target binary from the client. | |
2800 | */ | |
2801 | DBG("Receiving userspace probe target FD from client ..."); | |
2802 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2803 | if (ret <= 0) { | |
2804 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
2805 | *sock_error = 1; | |
2806 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2807 | goto error; | |
2808 | } | |
2809 | ||
2810 | /* | |
2811 | * Set the file descriptor received from the client through the unix | |
2812 | * socket in the probe location. | |
2813 | */ | |
2814 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
2815 | if (!lookup) { | |
2816 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2817 | goto error; | |
2818 | } | |
2819 | ||
2820 | /* | |
2821 | * From the kernel tracer's perspective, all userspace probe event types | |
2822 | * are all the same: a file and an offset. | |
2823 | */ | |
2824 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { | |
2825 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
2826 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
2827 | probe_location, fd); | |
2828 | break; | |
2829 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
2830 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
2831 | probe_location, fd); | |
2832 | break; | |
2833 | default: | |
2834 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2835 | goto error; | |
2836 | } | |
2837 | ||
2838 | if (ret) { | |
2839 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2840 | goto error; | |
2841 | } | |
2842 | ||
2843 | /* Attach the probe location to the event. */ | |
2844 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
2845 | if (ret) { | |
2846 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2847 | goto error; | |
2848 | } | |
2849 | ||
2850 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
2851 | error: | |
2852 | return ret; | |
2853 | } | |
2854 | ||
5c408ad8 JD |
2855 | /* |
2856 | * Check if the current kernel tracer supports the session rotation feature. | |
2857 | * Return 1 if it does, 0 otherwise. | |
2858 | */ | |
2859 | static int check_rotate_compatible(void) | |
2860 | { | |
2861 | int ret = 1; | |
2862 | ||
2863 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
2864 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2865 | ret = 0; | |
2866 | } | |
2867 | ||
2868 | return ret; | |
2869 | } | |
2870 | ||
54d01ffb DG |
2871 | /* |
2872 | * Process the command requested by the lttng client within the command | |
2873 | * context structure. This function make sure that the return structure (llm) | |
2874 | * is set and ready for transmission before returning. | |
2875 | * | |
2876 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2877 | * |
2878 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2879 | * |
2880 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2881 | */ |
53a80697 MD |
2882 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2883 | int *sock_error) | |
54d01ffb | 2884 | { |
f73fabfd | 2885 | int ret = LTTNG_OK; |
44d3bd01 | 2886 | int need_tracing_session = 1; |
2e09ba09 | 2887 | int need_domain; |
54d01ffb DG |
2888 | |
2889 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2890 | ||
3745d315 MD |
2891 | assert(!rcu_read_ongoing()); |
2892 | ||
53a80697 MD |
2893 | *sock_error = 0; |
2894 | ||
2e09ba09 MD |
2895 | switch (cmd_ctx->lsm->cmd_type) { |
2896 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2897 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2898 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
2899 | case LTTNG_DESTROY_SESSION: |
2900 | case LTTNG_LIST_SESSIONS: | |
2901 | case LTTNG_LIST_DOMAINS: | |
2902 | case LTTNG_START_TRACE: | |
2903 | case LTTNG_STOP_TRACE: | |
6d805429 | 2904 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2905 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2906 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2907 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2908 | case LTTNG_SNAPSHOT_RECORD: | |
fb198a11 | 2909 | case LTTNG_SAVE_SESSION: |
d7ba1388 | 2910 | case LTTNG_SET_SESSION_SHM_PATH: |
eded6438 | 2911 | case LTTNG_REGENERATE_METADATA: |
c2561365 | 2912 | case LTTNG_REGENERATE_STATEDUMP: |
b3530820 JG |
2913 | case LTTNG_REGISTER_TRIGGER: |
2914 | case LTTNG_UNREGISTER_TRIGGER: | |
5c408ad8 | 2915 | case LTTNG_ROTATE_SESSION: |
d68c9a04 | 2916 | case LTTNG_ROTATION_GET_INFO: |
259c2674 | 2917 | case LTTNG_ROTATION_SET_SCHEDULE: |
66ea93b1 | 2918 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
2e09ba09 | 2919 | need_domain = 0; |
3aace903 | 2920 | break; |
2e09ba09 MD |
2921 | default: |
2922 | need_domain = 1; | |
2923 | } | |
2924 | ||
e6142f2e | 2925 | if (config.no_kernel && need_domain |
2e09ba09 | 2926 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
531d29f9 | 2927 | if (!is_root) { |
f73fabfd | 2928 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2929 | } else { |
f73fabfd | 2930 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2931 | } |
4fba7219 DG |
2932 | goto error; |
2933 | } | |
2934 | ||
8d3113b2 DG |
2935 | /* Deny register consumer if we already have a spawned consumer. */ |
2936 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2937 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2938 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2939 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2940 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2941 | goto error; |
2942 | } | |
2943 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2944 | } | |
2945 | ||
54d01ffb DG |
2946 | /* |
2947 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2948 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2949 | * command. |
2950 | */ | |
2951 | switch(cmd_ctx->lsm->cmd_type) { | |
2952 | case LTTNG_LIST_SESSIONS: | |
2953 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2954 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2955 | case LTTNG_LIST_DOMAINS: |
2956 | case LTTNG_LIST_CHANNELS: | |
2957 | case LTTNG_LIST_EVENTS: | |
834978fd | 2958 | case LTTNG_LIST_SYSCALLS: |
a5dfbb9d | 2959 | case LTTNG_LIST_TRACKER_PIDS: |
5cd0780d | 2960 | case LTTNG_DATA_PENDING: |
5c408ad8 | 2961 | case LTTNG_ROTATE_SESSION: |
d68c9a04 | 2962 | case LTTNG_ROTATION_GET_INFO: |
66ea93b1 | 2963 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
54d01ffb DG |
2964 | break; |
2965 | default: | |
2966 | /* Setup lttng message with no payload */ | |
6e10c9b9 | 2967 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
54d01ffb DG |
2968 | if (ret < 0) { |
2969 | /* This label does not try to unlock the session */ | |
2970 | goto init_setup_error; | |
2971 | } | |
2972 | } | |
2973 | ||
2974 | /* Commands that DO NOT need a session. */ | |
2975 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2976 | case LTTNG_CREATE_SESSION: |
27babd3a | 2977 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2978 | case LTTNG_CREATE_SESSION_LIVE: |
54d01ffb DG |
2979 | case LTTNG_LIST_SESSIONS: |
2980 | case LTTNG_LIST_TRACEPOINTS: | |
834978fd | 2981 | case LTTNG_LIST_SYSCALLS: |
f37d259d | 2982 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
fb198a11 | 2983 | case LTTNG_SAVE_SESSION: |
b3530820 JG |
2984 | case LTTNG_REGISTER_TRIGGER: |
2985 | case LTTNG_UNREGISTER_TRIGGER: | |
44d3bd01 | 2986 | need_tracing_session = 0; |
54d01ffb DG |
2987 | break; |
2988 | default: | |
2989 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2990 | /* |
2991 | * We keep the session list lock across _all_ commands | |
2992 | * for now, because the per-session lock does not | |
2993 | * handle teardown properly. | |
2994 | */ | |
74babd95 | 2995 | session_lock_list(); |
54d01ffb DG |
2996 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2997 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2998 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2999 | goto error; |
3000 | } else { | |
3001 | /* Acquire lock for the session */ | |
3002 | session_lock(cmd_ctx->session); | |
3003 | } | |
3004 | break; | |
3005 | } | |
b389abbe | 3006 | |
5f3ecf22 DG |
3007 | /* |
3008 | * Commands that need a valid session but should NOT create one if none | |
3009 | * exists. Instead of creating one and destroying it when the command is | |
3010 | * handled, process that right before so we save some round trip in useless | |
3011 | * code path. | |
3012 | */ | |
3013 | switch (cmd_ctx->lsm->cmd_type) { | |
3014 | case LTTNG_DISABLE_CHANNEL: | |
3015 | case LTTNG_DISABLE_EVENT: | |
5f3ecf22 DG |
3016 | switch (cmd_ctx->lsm->domain.type) { |
3017 | case LTTNG_DOMAIN_KERNEL: | |
3018 | if (!cmd_ctx->session->kernel_session) { | |
3019 | ret = LTTNG_ERR_NO_CHANNEL; | |
3020 | goto error; | |
3021 | } | |
3022 | break; | |
3023 | case LTTNG_DOMAIN_JUL: | |
5cdb6027 | 3024 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3025 | case LTTNG_DOMAIN_PYTHON: |
5f3ecf22 DG |
3026 | case LTTNG_DOMAIN_UST: |
3027 | if (!cmd_ctx->session->ust_session) { | |
3028 | ret = LTTNG_ERR_NO_CHANNEL; | |
3029 | goto error; | |
3030 | } | |
3031 | break; | |
3032 | default: | |
3033 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3034 | goto error; | |
3035 | } | |
3036 | default: | |
3037 | break; | |
3038 | } | |
3039 | ||
2e09ba09 MD |
3040 | if (!need_domain) { |
3041 | goto skip_domain; | |
3042 | } | |
a4b92340 | 3043 | |
54d01ffb DG |
3044 | /* |
3045 | * Check domain type for specific "pre-action". | |
3046 | */ | |
3047 | switch (cmd_ctx->lsm->domain.type) { | |
3048 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3049 | if (!is_root) { |
f73fabfd | 3050 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3051 | goto error; |
3052 | } | |
3053 | ||
54d01ffb | 3054 | /* Kernel tracer check */ |
a4b35e07 | 3055 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3056 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3057 | ret = init_kernel_tracer(); |
3058 | if (ret != 0) { | |
54d01ffb DG |
3059 | goto error; |
3060 | } | |
3061 | } | |
5eb91c98 | 3062 | |
5c827ce0 DG |
3063 | /* Consumer is in an ERROR state. Report back to client */ |
3064 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3065 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3066 | goto error; |
3067 | } | |
3068 | ||
54d01ffb | 3069 | /* Need a session for kernel command */ |
44d3bd01 | 3070 | if (need_tracing_session) { |
54d01ffb | 3071 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3072 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3073 | if (ret < 0) { |
f73fabfd | 3074 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
3075 | goto error; |
3076 | } | |
b389abbe | 3077 | } |
7d29a247 | 3078 | |
54d01ffb | 3079 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3080 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3081 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 3082 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3083 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3084 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3085 | if (ret < 0) { |
f73fabfd | 3086 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 3087 | goto error; |
950131af | 3088 | } |
5c827ce0 | 3089 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3090 | } else { |
3091 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3092 | } |
173af62f | 3093 | |
a4b92340 DG |
3094 | /* |
3095 | * The consumer was just spawned so we need to add the socket to | |
3096 | * the consumer output of the session if exist. | |
3097 | */ | |
3098 | ret = consumer_create_socket(&kconsumer_data, | |
3099 | cmd_ctx->session->kernel_session->consumer); | |
3100 | if (ret < 0) { | |
3101 | goto error; | |
173af62f | 3102 | } |
0d0c377a | 3103 | } |
5c827ce0 | 3104 | |
54d01ffb | 3105 | break; |
b9dfb167 | 3106 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3107 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3108 | case LTTNG_DOMAIN_PYTHON: |
2bdd86d4 | 3109 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3110 | { |
b51ec5b4 MD |
3111 | if (!ust_app_supported()) { |
3112 | ret = LTTNG_ERR_NO_UST; | |
3113 | goto error; | |
3114 | } | |
5c827ce0 DG |
3115 | /* Consumer is in an ERROR state. Report back to client */ |
3116 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3117 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3118 | goto error; |
3119 | } | |
3120 | ||
44d3bd01 | 3121 | if (need_tracing_session) { |
a4b92340 | 3122 | /* Create UST session if none exist. */ |
f6a9efaa | 3123 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3124 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3125 | &cmd_ctx->lsm->domain); |
f73fabfd | 3126 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
3127 | goto error; |
3128 | } | |
3129 | } | |
00e2e675 | 3130 | |
7753dea8 MD |
3131 | /* Start the UST consumer daemons */ |
3132 | /* 64-bit */ | |
3133 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
e6142f2e | 3134 | if (config.consumerd64_bin_path.value && |
7753dea8 | 3135 | ustconsumer64_data.pid == 0 && |
785d2d0d | 3136 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3137 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3138 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3139 | if (ret < 0) { |
f73fabfd | 3140 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 3141 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
3142 | goto error; |
3143 | } | |
48842b30 | 3144 | |
173af62f | 3145 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 3146 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3147 | } else { |
7753dea8 MD |
3148 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3149 | } | |
173af62f DG |
3150 | |
3151 | /* | |
3152 | * Setup socket for consumer 64 bit. No need for atomic access | |
3153 | * since it was set above and can ONLY be set in this thread. | |
3154 | */ | |
a4b92340 DG |
3155 | ret = consumer_create_socket(&ustconsumer64_data, |
3156 | cmd_ctx->session->ust_session->consumer); | |
3157 | if (ret < 0) { | |
3158 | goto error; | |
173af62f DG |
3159 | } |
3160 | ||
7753dea8 | 3161 | /* 32-bit */ |
385b881b | 3162 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
e6142f2e | 3163 | if (config.consumerd32_bin_path.value && |
7753dea8 | 3164 | ustconsumer32_data.pid == 0 && |
785d2d0d | 3165 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3166 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
3167 | ret = start_consumerd(&ustconsumer32_data); | |
3168 | if (ret < 0) { | |
f73fabfd | 3169 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 3170 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
3171 | goto error; |
3172 | } | |
5c827ce0 | 3173 | |
173af62f | 3174 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 3175 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3176 | } else { |
3177 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3178 | } |
173af62f DG |
3179 | |
3180 | /* | |
92816cc3 | 3181 | * Setup socket for consumer 32 bit. No need for atomic access |
173af62f DG |
3182 | * since it was set above and can ONLY be set in this thread. |
3183 | */ | |
a4b92340 DG |
3184 | ret = consumer_create_socket(&ustconsumer32_data, |
3185 | cmd_ctx->session->ust_session->consumer); | |
3186 | if (ret < 0) { | |
3187 | goto error; | |
173af62f | 3188 | } |
44d3bd01 DG |
3189 | } |
3190 | break; | |
48842b30 | 3191 | } |
54d01ffb | 3192 | default: |
54d01ffb DG |
3193 | break; |
3194 | } | |
2e09ba09 | 3195 | skip_domain: |
33a2b854 | 3196 | |
5c827ce0 DG |
3197 | /* Validate consumer daemon state when start/stop trace command */ |
3198 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3199 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3200 | switch (cmd_ctx->lsm->domain.type) { | |
e7619875 JG |
3201 | case LTTNG_DOMAIN_NONE: |
3202 | break; | |
b9dfb167 | 3203 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3204 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3205 | case LTTNG_DOMAIN_PYTHON: |
5c827ce0 DG |
3206 | case LTTNG_DOMAIN_UST: |
3207 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3208 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3209 | goto error; |
3210 | } | |
3211 | break; | |
3212 | case LTTNG_DOMAIN_KERNEL: | |
3213 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3214 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3215 | goto error; |
3216 | } | |
3217 | break; | |
825535cc JG |
3218 | default: |
3219 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3220 | goto error; | |
5c827ce0 DG |
3221 | } |
3222 | } | |
3223 | ||
8e0af1b4 MD |
3224 | /* |
3225 | * Check that the UID or GID match that of the tracing session. | |
3226 | * The root user can interact with all sessions. | |
3227 | */ | |
3228 | if (need_tracing_session) { | |
3229 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 | 3230 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
e32d7f27 JG |
3231 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || |
3232 | cmd_ctx->session->destroyed) { | |
f73fabfd | 3233 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
3234 | goto error; |
3235 | } | |
3236 | } | |
3237 | ||
ffe60014 DG |
3238 | /* |
3239 | * Send relayd information to consumer as soon as we have a domain and a | |
3240 | * session defined. | |
3241 | */ | |
3242 | if (cmd_ctx->session && need_domain) { | |
3243 | /* | |
3244 | * Setup relayd if not done yet. If the relayd information was already | |
3245 | * sent to the consumer, this call will gracefully return. | |
3246 | */ | |
3247 | ret = cmd_setup_relayd(cmd_ctx->session); | |
3248 | if (ret != LTTNG_OK) { | |
3249 | goto error; | |
3250 | } | |
3251 | } | |
3252 | ||
54d01ffb DG |
3253 | /* Process by command type */ |
3254 | switch (cmd_ctx->lsm->cmd_type) { | |
3255 | case LTTNG_ADD_CONTEXT: | |
3256 | { | |
2001793c JG |
3257 | /* |
3258 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
3259 | * payload if the context being added is an application context. | |
3260 | */ | |
3261 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
3262 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
3263 | char *provider_name = NULL, *context_name = NULL; | |
3264 | size_t provider_name_len = | |
3265 | cmd_ctx->lsm->u.context.provider_name_len; | |
3266 | size_t context_name_len = | |
3267 | cmd_ctx->lsm->u.context.context_name_len; | |
3268 | ||
3269 | if (provider_name_len == 0 || context_name_len == 0) { | |
3270 | /* | |
3271 | * Application provider and context names MUST | |
3272 | * be provided. | |
3273 | */ | |
3274 | ret = -LTTNG_ERR_INVALID; | |
3275 | goto error; | |
3276 | } | |
3277 | ||
3278 | provider_name = zmalloc(provider_name_len + 1); | |
3279 | if (!provider_name) { | |
3280 | ret = -LTTNG_ERR_NOMEM; | |
3281 | goto error; | |
3282 | } | |
e0f4d107 JG |
3283 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
3284 | provider_name; | |
2001793c JG |
3285 | |
3286 | context_name = zmalloc(context_name_len + 1); | |
3287 | if (!context_name) { | |
3288 | ret = -LTTNG_ERR_NOMEM; | |
3289 | goto error_add_context; | |
3290 | } | |
e0f4d107 JG |
3291 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
3292 | context_name; | |
2001793c JG |
3293 | |
3294 | ret = lttcomm_recv_unix_sock(sock, provider_name, | |
3295 | provider_name_len); | |
3296 | if (ret < 0) { | |
3297 | goto error_add_context; | |
3298 | } | |
3299 | ||
3300 | ret = lttcomm_recv_unix_sock(sock, context_name, | |
3301 | context_name_len); | |
3302 | if (ret < 0) { | |
3303 | goto error_add_context; | |
3304 | } | |
2001793c JG |
3305 | } |
3306 | ||
3307 | /* | |
3308 | * cmd_add_context assumes ownership of the provider and context | |
3309 | * names. | |
3310 | */ | |
3311 | ret = cmd_add_context(cmd_ctx->session, | |
3312 | cmd_ctx->lsm->domain.type, | |
54d01ffb | 3313 | cmd_ctx->lsm->u.context.channel_name, |
2001793c JG |
3314 | &cmd_ctx->lsm->u.context.ctx, |
3315 | kernel_poll_pipe[1]); | |
3316 | ||
3317 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
3318 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
3319 | error_add_context: | |
3320 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
3321 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
3322 | if (ret < 0) { | |
3323 | goto error; | |
3324 | } | |
54d01ffb DG |
3325 | break; |
3326 | } | |
3327 | case LTTNG_DISABLE_CHANNEL: | |
3328 | { | |
3329 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3330 | cmd_ctx->lsm->u.disable.channel_name); | |
3331 | break; | |
3332 | } | |
3333 | case LTTNG_DISABLE_EVENT: | |
3334 | { | |
47b7e2f9 JG |
3335 | |
3336 | /* | |
3337 | * FIXME: handle filter; for now we just receive the filter's | |
3338 | * bytecode along with the filter expression which are sent by | |
3339 | * liblttng-ctl and discard them. | |
3340 | * | |
3341 | * This fixes an issue where the client may block while sending | |
3342 | * the filter payload and encounter an error because the session | |
3343 | * daemon closes the socket without ever handling this data. | |
3344 | */ | |
3345 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
3346 | cmd_ctx->lsm->u.disable.bytecode_len; | |
3347 | ||
3348 | if (count) { | |
3349 | char data[LTTNG_FILTER_MAX_LEN]; | |
3350 | ||
3351 | DBG("Discarding disable event command payload of size %zu", count); | |
3352 | while (count) { | |
3353 | ret = lttcomm_recv_unix_sock(sock, data, | |
3354 | count > sizeof(data) ? sizeof(data) : count); | |
3355 | if (ret < 0) { | |
3356 | goto error; | |
3357 | } | |
3358 | ||
3359 | count -= (size_t) ret; | |
3360 | } | |
3361 | } | |
6e911cad | 3362 | /* FIXME: passing packed structure to non-packed pointer */ |
54d01ffb DG |
3363 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3364 | cmd_ctx->lsm->u.disable.channel_name, | |
6e911cad | 3365 | &cmd_ctx->lsm->u.disable.event); |
33a2b854 DG |
3366 | break; |
3367 | } | |
54d01ffb DG |
3368 | case LTTNG_ENABLE_CHANNEL: |
3369 | { | |
b3530820 JG |
3370 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = |
3371 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
7972aab2 | 3372 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
b3530820 JG |
3373 | &cmd_ctx->lsm->u.channel.chan, |
3374 | kernel_poll_pipe[1]); | |
54d01ffb DG |
3375 | break; |
3376 | } | |
ccf10263 MD |
3377 | case LTTNG_TRACK_PID: |
3378 | { | |
3379 | ret = cmd_track_pid(cmd_ctx->session, | |
3380 | cmd_ctx->lsm->domain.type, | |
3381 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3382 | break; | |
3383 | } | |
3384 | case LTTNG_UNTRACK_PID: | |
3385 | { | |
3386 | ret = cmd_untrack_pid(cmd_ctx->session, | |
3387 | cmd_ctx->lsm->domain.type, | |
3388 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3389 | break; | |
3390 | } | |
54d01ffb DG |
3391 | case LTTNG_ENABLE_EVENT: |
3392 | { | |
dcabc190 | 3393 | struct lttng_event *ev = NULL; |
882ef835 JI |
3394 | struct lttng_event_exclusion *exclusion = NULL; |
3395 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3396 | char *filter_expression = NULL; |
882ef835 | 3397 | |
67676bd8 DG |
3398 | /* Handle exclusion events and receive it from the client. */ |
3399 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3400 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3401 | ||
3402 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3403 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3404 | if (!exclusion) { | |
3405 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3406 | goto error; | |
882ef835 | 3407 | } |
882ef835 | 3408 | |
67676bd8 DG |
3409 | DBG("Receiving var len exclusion event list from client ..."); |
3410 | exclusion->count = count; | |
3411 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3412 | count * LTTNG_SYMBOL_NAME_LEN); | |
3413 | if (ret <= 0) { | |
3414 | DBG("Nothing recv() from client var len data... continuing"); | |
3415 | *sock_error = 1; | |
3416 | free(exclusion); | |
3417 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3418 | goto error; | |
3419 | } | |
3420 | } | |
3421 | ||
6b453b5e JG |
3422 | /* Get filter expression from client. */ |
3423 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3424 | size_t expression_len = | |
3425 | cmd_ctx->lsm->u.enable.expression_len; | |
3426 | ||
3427 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3428 | ret = LTTNG_ERR_FILTER_INVAL; | |
3429 | free(exclusion); | |
3430 | goto error; | |
3431 | } | |
3432 | ||
3433 | filter_expression = zmalloc(expression_len); | |
3434 | if (!filter_expression) { | |
3435 | free(exclusion); | |
3436 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3437 | goto error; | |
3438 | } | |
3439 | ||
3440 | /* Receive var. len. data */ | |
3441 | DBG("Receiving var len filter's expression from client ..."); | |
3442 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3443 | expression_len); | |
3444 | if (ret <= 0) { | |
dcabc190 | 3445 | DBG("Nothing recv() from client var len data... continuing"); |
6b453b5e JG |
3446 | *sock_error = 1; |
3447 | free(filter_expression); | |
3448 | free(exclusion); | |
3449 | ret = LTTNG_ERR_FILTER_INVAL; | |
3450 | goto error; | |
3451 | } | |
3452 | } | |
3453 | ||
67676bd8 DG |
3454 | /* Handle filter and get bytecode from client. */ |
3455 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3456 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3457 | ||
3458 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3459 | ret = LTTNG_ERR_FILTER_INVAL; | |
49d21f93 | 3460 | free(filter_expression); |
67676bd8 DG |
3461 | free(exclusion); |
3462 | goto error; | |
3463 | } | |
3464 | ||
3465 | bytecode = zmalloc(bytecode_len); | |
3466 | if (!bytecode) { | |
49d21f93 | 3467 | free(filter_expression); |
67676bd8 DG |
3468 | free(exclusion); |
3469 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3470 | goto error; | |
882ef835 JI |
3471 | } |
3472 | ||
67676bd8 DG |
3473 | /* Receive var. len. data */ |
3474 | DBG("Receiving var len filter's bytecode from client ..."); | |
3475 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3476 | if (ret <= 0) { | |
dcabc190 | 3477 | DBG("Nothing recv() from client var len data... continuing"); |
67676bd8 | 3478 | *sock_error = 1; |
49d21f93 | 3479 | free(filter_expression); |
67676bd8 DG |
3480 | free(bytecode); |
3481 | free(exclusion); | |
3482 | ret = LTTNG_ERR_FILTER_INVAL; | |
3483 | goto error; | |
3484 | } | |
3485 | ||
3486 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
49d21f93 | 3487 | free(filter_expression); |
67676bd8 DG |
3488 | free(bytecode); |
3489 | free(exclusion); | |
3490 | ret = LTTNG_ERR_FILTER_INVAL; | |
3491 | goto error; | |
3492 | } | |
882ef835 | 3493 | } |
67676bd8 | 3494 | |
dcabc190 FD |
3495 | ev = lttng_event_copy(&cmd_ctx->lsm->u.enable.event); |
3496 | if (!ev) { | |
3497 | DBG("Failed to copy event: %s", | |
3498 | cmd_ctx->lsm->u.enable.event.name); | |
5ae0c80e JG |
3499 | free(filter_expression); |
3500 | free(bytecode); | |
3501 | free(exclusion); | |
dcabc190 FD |
3502 | ret = LTTNG_ERR_NOMEM; |
3503 | goto error; | |
3504 | } | |
3505 | ||
3506 | ||
3507 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { | |
3508 | /* Expect a userspace probe description. */ | |
3509 | ret = receive_userspace_probe(cmd_ctx, sock, sock_error, ev); | |
3510 | if (ret) { | |
5ae0c80e JG |
3511 | free(filter_expression); |
3512 | free(bytecode); | |
3513 | free(exclusion); | |
dcabc190 FD |
3514 | lttng_event_destroy(ev); |
3515 | goto error; | |
3516 | } | |
3517 | } | |
3518 | ||
67676bd8 DG |
3519 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
3520 | cmd_ctx->lsm->u.enable.channel_name, | |
dcabc190 | 3521 | ev, |
6b453b5e | 3522 | filter_expression, bytecode, exclusion, |
67676bd8 | 3523 | kernel_poll_pipe[1]); |
dcabc190 | 3524 | lttng_event_destroy(ev); |
54d01ffb DG |
3525 | break; |
3526 | } | |
052da939 | 3527 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3528 | { |
9f19cc17 | 3529 | struct lttng_event *events; |
54d01ffb | 3530 | ssize_t nb_events; |
052da939 | 3531 | |
0845bbfa | 3532 | session_lock_list(); |
54d01ffb | 3533 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
0845bbfa | 3534 | session_unlock_list(); |
54d01ffb | 3535 | if (nb_events < 0) { |
f73fabfd | 3536 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3537 | ret = -nb_events; |
3538 | goto error; | |
2ef84c95 DG |
3539 | } |
3540 | ||
3541 | /* | |
3542 | * Setup lttng message with payload size set to the event list size in | |
3543 | * bytes and then copy list into the llm payload. | |
3544 | */ | |
6e10c9b9 PP |
3545 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3546 | sizeof(struct lttng_event) * nb_events); | |
3547 | free(events); | |
3548 | ||
2ef84c95 DG |
3549 | if (ret < 0) { |
3550 | goto setup_error; | |
3551 | } | |
3552 | ||
f73fabfd | 3553 | ret = LTTNG_OK; |
2ef84c95 DG |
3554 | break; |
3555 | } | |
f37d259d MD |
3556 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3557 | { | |
3558 | struct lttng_event_field *fields; | |
3559 | ssize_t nb_fields; | |
3560 | ||
0845bbfa | 3561 | session_lock_list(); |
a4b92340 DG |
3562 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3563 | &fields); | |
0845bbfa | 3564 | session_unlock_list(); |
f37d259d | 3565 | if (nb_fields < 0) { |
f73fabfd | 3566 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3567 | ret = -nb_fields; |
3568 | goto error; | |
3569 | } | |
3570 | ||
3571 | /* | |
3572 | * Setup lttng message with payload size set to the event list size in | |
3573 | * bytes and then copy list into the llm payload. | |
3574 | */ | |
6e10c9b9 | 3575 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
a4b92340 | 3576 | sizeof(struct lttng_event_field) * nb_fields); |
6e10c9b9 PP |
3577 | free(fields); |
3578 | ||
f37d259d | 3579 | if (ret < 0) { |
f37d259d MD |
3580 | goto setup_error; |
3581 | } | |
3582 | ||
f73fabfd | 3583 | ret = LTTNG_OK; |
f37d259d MD |
3584 | break; |
3585 | } | |
834978fd DG |
3586 | case LTTNG_LIST_SYSCALLS: |
3587 | { | |
3588 | struct lttng_event *events; | |
3589 | ssize_t nb_events; | |
3590 | ||
3591 | nb_events = cmd_list_syscalls(&events); | |
3592 | if (nb_events < 0) { | |
3593 | /* Return value is a negative lttng_error_code. */ | |
3594 | ret = -nb_events; | |
3595 | goto error; | |
3596 | } | |
3597 | ||
3598 | /* | |
3599 | * Setup lttng message with payload size set to the event list size in | |
3600 | * bytes and then copy list into the llm payload. | |
3601 | */ | |
6e10c9b9 PP |
3602 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3603 | sizeof(struct lttng_event) * nb_events); | |
3604 | free(events); | |
3605 | ||
834978fd | 3606 | if (ret < 0) { |
834978fd DG |
3607 | goto setup_error; |
3608 | } | |
3609 | ||
834978fd DG |
3610 | ret = LTTNG_OK; |
3611 | break; | |
3612 | } | |
a5dfbb9d MD |
3613 | case LTTNG_LIST_TRACKER_PIDS: |
3614 | { | |
3615 | int32_t *pids = NULL; | |
3616 | ssize_t nr_pids; | |
3617 | ||
3618 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
3619 | cmd_ctx->lsm->domain.type, &pids); | |
3620 | if (nr_pids < 0) { | |
3621 | /* Return value is a negative lttng_error_code. */ | |
3622 | ret = -nr_pids; | |
3623 | goto error; | |
3624 | } | |
3625 | ||
3626 | /* | |
3627 | * Setup lttng message with payload size set to the event list size in | |
3628 | * bytes and then copy list into the llm payload. | |
3629 | */ | |
6e10c9b9 PP |
3630 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, |
3631 | sizeof(int32_t) * nr_pids); | |
3632 | free(pids); | |
3633 | ||
a5dfbb9d | 3634 | if (ret < 0) { |
a5dfbb9d MD |
3635 | goto setup_error; |
3636 | } | |
3637 | ||
a5dfbb9d MD |
3638 | ret = LTTNG_OK; |
3639 | break; | |
3640 | } | |
00e2e675 DG |
3641 | case LTTNG_SET_CONSUMER_URI: |
3642 | { | |
a4b92340 DG |
3643 | size_t nb_uri, len; |
3644 | struct lttng_uri *uris; | |
3645 | ||
3646 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3647 | len = nb_uri * sizeof(struct lttng_uri); | |
3648 | ||
3649 | if (nb_uri == 0) { | |
f73fabfd | 3650 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3651 | goto error; |
3652 | } | |
3653 | ||
3654 | uris = zmalloc(len); | |
3655 | if (uris == NULL) { | |
f73fabfd | 3656 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3657 | goto error; |
3658 | } | |
3659 | ||
3660 | /* Receive variable len data */ | |
77c7c900 | 3661 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3662 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3663 | if (ret <= 0) { | |
3664 | DBG("No URIs received from client... continuing"); | |
3665 | *sock_error = 1; | |
f73fabfd | 3666 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3667 | free(uris); |
a4b92340 DG |
3668 | goto error; |
3669 | } | |
3670 | ||
bda32d56 JG |
3671 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
3672 | free(uris); | |
f73fabfd | 3673 | if (ret != LTTNG_OK) { |
a4b92340 DG |
3674 | goto error; |
3675 | } | |
3676 | ||
b1d41407 | 3677 | |
00e2e675 DG |
3678 | break; |
3679 | } | |
f3ed775e | 3680 | case LTTNG_START_TRACE: |
8c0faa1d | 3681 | { |
259c2674 JD |
3682 | /* |
3683 | * On the first start, if we have a kernel session and we have | |
3684 | * enabled time or size-based rotations, we have to make sure | |
3685 | * the kernel tracer supports it. | |
3686 | */ | |
3687 | if (!cmd_ctx->session->has_been_started && \ | |
3688 | cmd_ctx->session->kernel_session && \ | |
3689 | (cmd_ctx->session->rotate_timer_period || \ | |
3690 | cmd_ctx->session->rotate_size) && \ | |
3691 | !check_rotate_compatible()) { | |
3692 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
3693 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
3694 | goto error; | |
3695 | } | |
54d01ffb | 3696 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3697 | break; |
3698 | } | |
f3ed775e | 3699 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3700 | { |
54d01ffb | 3701 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3702 | break; |
3703 | } | |
5e16da05 MD |
3704 | case LTTNG_CREATE_SESSION: |
3705 | { | |
a4b92340 DG |
3706 | size_t nb_uri, len; |
3707 | struct lttng_uri *uris = NULL; | |
3708 | ||
3709 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3710 | len = nb_uri * sizeof(struct lttng_uri); | |
3711 | ||
3712 | if (nb_uri > 0) { | |
3713 | uris = zmalloc(len); | |
3714 | if (uris == NULL) { | |
f73fabfd | 3715 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3716 | goto error; |
3717 | } | |
3718 | ||
3719 | /* Receive variable len data */ | |
77c7c900 | 3720 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3721 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3722 | if (ret <= 0) { | |
3723 | DBG("No URIs received from client... continuing"); | |
3724 | *sock_error = 1; | |
f73fabfd | 3725 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3726 | free(uris); |
a4b92340 DG |
3727 | goto error; |
3728 | } | |
3729 | ||
3730 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3731 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3732 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3733 | free(uris); |
a4b92340 DG |
3734 | goto error; |
3735 | } | |
3736 | } | |
3737 | ||
3738 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3739 | &cmd_ctx->creds, 0); |
a4b92340 | 3740 | |
b1d41407 DG |
3741 | free(uris); |
3742 | ||
00e2e675 DG |
3743 | break; |
3744 | } | |
5e16da05 MD |
3745 | case LTTNG_DESTROY_SESSION: |
3746 | { | |
e32d7f27 | 3747 | ret = cmd_destroy_session(cmd_ctx->session, |
90936dcf | 3748 | notification_thread_handle); |
5461b305 | 3749 | break; |
5e16da05 | 3750 | } |
9f19cc17 | 3751 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3752 | { |
54d01ffb | 3753 | ssize_t nb_dom; |
fa64dfb4 | 3754 | struct lttng_domain *domains = NULL; |
5461b305 | 3755 | |
54d01ffb DG |
3756 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3757 | if (nb_dom < 0) { | |
f73fabfd | 3758 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3759 | ret = -nb_dom; |
3760 | goto error; | |
ce3d728c | 3761 | } |
520ff687 | 3762 | |
6e10c9b9 PP |
3763 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
3764 | nb_dom * sizeof(struct lttng_domain)); | |
3765 | free(domains); | |
3766 | ||
5461b305 DG |
3767 | if (ret < 0) { |
3768 | goto setup_error; | |
520ff687 | 3769 | } |
57167058 | 3770 | |
f73fabfd | 3771 | ret = LTTNG_OK; |
5e16da05 MD |
3772 | break; |
3773 | } | |
9f19cc17 | 3774 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3775 | { |
53e367f9 | 3776 | ssize_t payload_size; |
ade7ce52 | 3777 | struct lttng_channel *channels = NULL; |
54d01ffb | 3778 | |
53e367f9 | 3779 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
b551a063 | 3780 | cmd_ctx->session, &channels); |
53e367f9 | 3781 | if (payload_size < 0) { |
f73fabfd | 3782 | /* Return value is a negative lttng_error_code. */ |
53e367f9 | 3783 | ret = -payload_size; |
54d01ffb | 3784 | goto error; |
5461b305 | 3785 | } |
ca95a216 | 3786 | |
6e10c9b9 | 3787 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
53e367f9 | 3788 | payload_size); |
6e10c9b9 PP |
3789 | free(channels); |
3790 | ||
5461b305 DG |
3791 | if (ret < 0) { |
3792 | goto setup_error; | |
3793 | } | |
9f19cc17 | 3794 | |
f73fabfd | 3795 | ret = LTTNG_OK; |
5461b305 | 3796 | break; |
5e16da05 | 3797 | } |
9f19cc17 | 3798 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3799 | { |
b551a063 | 3800 | ssize_t nb_event; |
684d34d2 | 3801 | struct lttng_event *events = NULL; |
b4e3ceb9 PP |
3802 | struct lttcomm_event_command_header cmd_header; |
3803 | size_t total_size; | |
3804 | ||
b2d66287 | 3805 | memset(&cmd_header, 0, sizeof(cmd_header)); |
b4e3ceb9 PP |
3806 | /* Extended infos are included at the end of events */ |
3807 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
3808 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
3809 | &events, &total_size); | |
9f19cc17 | 3810 | |
54d01ffb | 3811 | if (nb_event < 0) { |
f73fabfd | 3812 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3813 | ret = -nb_event; |
3814 | goto error; | |
5461b305 | 3815 | } |
ca95a216 | 3816 | |
b4e3ceb9 PP |
3817 | cmd_header.nb_events = nb_event; |
3818 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
3819 | &cmd_header, sizeof(cmd_header)); | |
6e10c9b9 PP |
3820 | free(events); |
3821 | ||
5461b305 DG |
3822 | if (ret < 0) { |
3823 | goto setup_error; | |
3824 | } | |
9f19cc17 | 3825 | |
f73fabfd | 3826 | ret = LTTNG_OK; |
5461b305 | 3827 | break; |
5e16da05 MD |
3828 | } |
3829 | case LTTNG_LIST_SESSIONS: | |
3830 | { | |
8e0af1b4 | 3831 | unsigned int nr_sessions; |
6e10c9b9 PP |
3832 | void *sessions_payload; |
3833 | size_t payload_len; | |
5461b305 | 3834 | |
8e0af1b4 | 3835 | session_lock_list(); |
730389d9 DG |
3836 | nr_sessions = lttng_sessions_count( |
3837 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3838 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6e10c9b9 PP |
3839 | payload_len = sizeof(struct lttng_session) * nr_sessions; |
3840 | sessions_payload = zmalloc(payload_len); | |
d32fb093 | 3841 | |
6e10c9b9 | 3842 | if (!sessions_payload) { |
54d01ffb | 3843 | session_unlock_list(); |
6e10c9b9 | 3844 | ret = -ENOMEM; |
5461b305 | 3845 | goto setup_error; |
e065084a | 3846 | } |
5e16da05 | 3847 | |
6e10c9b9 | 3848 | cmd_list_lttng_sessions(sessions_payload, |
730389d9 DG |
3849 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3850 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
54d01ffb | 3851 | session_unlock_list(); |
5e16da05 | 3852 | |
6e10c9b9 PP |
3853 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
3854 | payload_len); | |
3855 | free(sessions_payload); | |
3856 | ||
3857 | if (ret < 0) { | |
3858 | goto setup_error; | |
3859 | } | |
3860 | ||
f73fabfd | 3861 | ret = LTTNG_OK; |
5e16da05 MD |
3862 | break; |
3863 | } | |
d9800920 DG |
3864 | case LTTNG_REGISTER_CONSUMER: |
3865 | { | |
2f77fc4b DG |
3866 | struct consumer_data *cdata; |
3867 | ||
3868 | switch (cmd_ctx->lsm->domain.type) { | |
3869 | case LTTNG_DOMAIN_KERNEL: | |
3870 | cdata = &kconsumer_data; | |
3871 | break; | |
3872 | default: | |
f73fabfd | 3873 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3874 | goto error; |
3875 | } | |
3876 | ||
54d01ffb | 3877 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3878 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3879 | break; |
3880 | } | |
6d805429 | 3881 | case LTTNG_DATA_PENDING: |
806e2684 | 3882 | { |
f6151c55 | 3883 | int pending_ret; |
6e10c9b9 | 3884 | uint8_t pending_ret_byte; |
f6151c55 JG |
3885 | |
3886 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
6e10c9b9 | 3887 | |
f6151c55 JG |
3888 | /* |
3889 | * FIXME | |
3890 | * | |
3891 | * This function may returns 0 or 1 to indicate whether or not | |
3892 | * there is data pending. In case of error, it should return an | |
3893 | * LTTNG_ERR code. However, some code paths may still return | |
3894 | * a nondescript error code, which we handle by returning an | |
3895 | * "unknown" error. | |
3896 | */ | |
3897 | if (pending_ret == 0 || pending_ret == 1) { | |
6e10c9b9 PP |
3898 | /* |
3899 | * ret will be set to LTTNG_OK at the end of | |
3900 | * this function. | |
3901 | */ | |
f6151c55 JG |
3902 | } else if (pending_ret < 0) { |
3903 | ret = LTTNG_ERR_UNK; | |
3904 | goto setup_error; | |
3905 | } else { | |
3906 | ret = pending_ret; | |
3907 | goto setup_error; | |
3908 | } | |
3909 | ||
6e10c9b9 PP |
3910 | pending_ret_byte = (uint8_t) pending_ret; |
3911 | ||
3912 | /* 1 byte to return whether or not data is pending */ | |
3913 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
3914 | &pending_ret_byte, 1); | |
3915 | ||
3916 | if (ret < 0) { | |
3917 | goto setup_error; | |
3918 | } | |
3919 | ||
3920 | ret = LTTNG_OK; | |
806e2684 DG |
3921 | break; |
3922 | } | |
da3c9ec1 DG |
3923 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3924 | { | |
6dc3064a DG |
3925 | struct lttcomm_lttng_output_id reply; |
3926 | ||
3927 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3928 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3929 | if (ret != LTTNG_OK) { | |
3930 | goto error; | |
3931 | } | |
3932 | ||
6e10c9b9 PP |
3933 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
3934 | sizeof(reply)); | |
6dc3064a DG |
3935 | if (ret < 0) { |
3936 | goto setup_error; | |
3937 | } | |
3938 | ||
3939 | /* Copy output list into message payload */ | |
6dc3064a | 3940 | ret = LTTNG_OK; |
da3c9ec1 DG |
3941 | break; |
3942 | } | |
3943 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3944 | { | |
6dc3064a DG |
3945 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3946 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3947 | break; |
3948 | } | |
3949 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3950 | { | |
6dc3064a DG |
3951 | ssize_t nb_output; |
3952 | struct lttng_snapshot_output *outputs = NULL; | |
3953 | ||
3954 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3955 | if (nb_output < 0) { | |
3956 | ret = -nb_output; | |
3957 | goto error; | |
3958 | } | |
3959 | ||
6e10c9b9 PP |
3960 | assert((nb_output > 0 && outputs) || nb_output == 0); |
3961 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
6dc3064a | 3962 | nb_output * sizeof(struct lttng_snapshot_output)); |
6e10c9b9 PP |
3963 | free(outputs); |
3964 | ||
6dc3064a | 3965 | if (ret < 0) { |
6dc3064a DG |
3966 | goto setup_error; |
3967 | } | |
3968 | ||
6dc3064a | 3969 | ret = LTTNG_OK; |
da3c9ec1 DG |
3970 | break; |
3971 | } | |
3972 | case LTTNG_SNAPSHOT_RECORD: | |
3973 | { | |
6dc3064a DG |
3974 | ret = cmd_snapshot_record(cmd_ctx->session, |
3975 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3976 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3977 | break; |
3978 | } | |
27babd3a DG |
3979 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3980 | { | |
3981 | size_t nb_uri, len; | |
3982 | struct lttng_uri *uris = NULL; | |
3983 | ||
3984 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3985 | len = nb_uri * sizeof(struct lttng_uri); | |
3986 | ||
3987 | if (nb_uri > 0) { | |
3988 | uris = zmalloc(len); | |
3989 | if (uris == NULL) { | |
3990 | ret = LTTNG_ERR_FATAL; | |
3991 | goto error; | |
3992 | } | |
3993 | ||
3994 | /* Receive variable len data */ | |
3995 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3996 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3997 | if (ret <= 0) { | |
3998 | DBG("No URIs received from client... continuing"); | |
3999 | *sock_error = 1; | |
4000 | ret = LTTNG_ERR_SESSION_FAIL; | |
4001 | free(uris); | |
4002 | goto error; | |
4003 | } | |
4004 | ||
4005 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4006 | DBG("Creating session with ONE network URI is a bad call"); | |
4007 | ret = LTTNG_ERR_SESSION_FAIL; | |
4008 | free(uris); | |
4009 | goto error; | |
4010 | } | |
4011 | } | |
4012 | ||
4013 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
4014 | nb_uri, &cmd_ctx->creds); | |
4015 | free(uris); | |
4016 | break; | |
4017 | } | |
ecc48a90 JD |
4018 | case LTTNG_CREATE_SESSION_LIVE: |
4019 | { | |
4020 | size_t nb_uri, len; | |
4021 | struct lttng_uri *uris = NULL; | |
4022 | ||
4023 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4024 | len = nb_uri * sizeof(struct lttng_uri); | |
4025 | ||
4026 | if (nb_uri > 0) { | |
4027 | uris = zmalloc(len); | |
4028 | if (uris == NULL) { | |
4029 | ret = LTTNG_ERR_FATAL; | |
4030 | goto error; | |
4031 | } | |
4032 | ||
4033 | /* Receive variable len data */ | |
4034 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4035 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4036 | if (ret <= 0) { | |
4037 | DBG("No URIs received from client... continuing"); | |
4038 | *sock_error = 1; | |
4039 | ret = LTTNG_ERR_SESSION_FAIL; | |
4040 | free(uris); | |
4041 | goto error; | |
4042 | } | |
4043 | ||
4044 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4045 | DBG("Creating session with ONE network URI is a bad call"); | |
4046 | ret = LTTNG_ERR_SESSION_FAIL; | |
4047 | free(uris); | |
4048 | goto error; | |
4049 | } | |
4050 | } | |
4051 | ||
4052 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
4053 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
4054 | free(uris); | |
4055 | break; | |
4056 | } | |
fb198a11 JG |
4057 | case LTTNG_SAVE_SESSION: |
4058 | { | |
4059 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
4060 | &cmd_ctx->creds); | |
4061 | break; | |
4062 | } | |
d7ba1388 MD |
4063 | case LTTNG_SET_SESSION_SHM_PATH: |
4064 | { | |
4065 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
4066 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
4067 | break; | |
4068 | } | |
eded6438 | 4069 | case LTTNG_REGENERATE_METADATA: |
93ec662e | 4070 | { |
eded6438 | 4071 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
93ec662e JD |
4072 | break; |
4073 | } | |
c2561365 JD |
4074 | case LTTNG_REGENERATE_STATEDUMP: |
4075 | { | |
4076 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
4077 | break; | |
4078 | } | |
b3530820 JG |
4079 | case LTTNG_REGISTER_TRIGGER: |
4080 | { | |
4081 | ret = cmd_register_trigger(cmd_ctx, sock, | |
4082 | notification_thread_handle); | |
4083 | break; | |
4084 | } | |
4085 | case LTTNG_UNREGISTER_TRIGGER: | |
4086 | { | |
4087 | ret = cmd_unregister_trigger(cmd_ctx, sock, | |
4088 | notification_thread_handle); | |
4089 | break; | |
4090 | } | |
5c408ad8 JD |
4091 | case LTTNG_ROTATE_SESSION: |
4092 | { | |
4093 | struct lttng_rotate_session_return rotate_return; | |
4094 | ||
4095 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
4096 | ||
d68c9a04 | 4097 | memset(&rotate_return, 0, sizeof(rotate_return)); |
5c408ad8 JD |
4098 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
4099 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
4100 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
4101 | goto error; | |
4102 | } | |
4103 | ||
4104 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return); | |
4105 | if (ret < 0) { | |
4106 | ret = -ret; | |
4107 | goto error; | |
4108 | } | |
4109 | ||
4110 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
4111 | sizeof(rotate_return)); | |
4112 | if (ret < 0) { | |
4113 | ret = -ret; | |
4114 | goto error; | |
4115 | } | |
4116 | ||
4117 | ret = LTTNG_OK; | |
4118 | break; | |
4119 | } | |
d68c9a04 | 4120 | case LTTNG_ROTATION_GET_INFO: |
5c408ad8 | 4121 | { |
d68c9a04 | 4122 | struct lttng_rotation_get_info_return get_info_return; |
5c408ad8 | 4123 | |
d68c9a04 JD |
4124 | memset(&get_info_return, 0, sizeof(get_info_return)); |
4125 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
4126 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); | |
5c408ad8 JD |
4127 | if (ret < 0) { |
4128 | ret = -ret; | |
4129 | goto error; | |
4130 | } | |
4131 | ||
d68c9a04 JD |
4132 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, |
4133 | sizeof(get_info_return)); | |
5c408ad8 JD |
4134 | if (ret < 0) { |
4135 | ret = -ret; | |
4136 | goto error; | |
4137 | } | |
4138 | ||
4139 | ret = LTTNG_OK; | |
4140 | break; | |
4141 | } | |
259c2674 JD |
4142 | case LTTNG_ROTATION_SET_SCHEDULE: |
4143 | { | |
66ea93b1 JG |
4144 | bool set_schedule; |
4145 | enum lttng_rotation_schedule_type schedule_type; | |
4146 | uint64_t value; | |
4147 | ||
259c2674 JD |
4148 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
4149 | DBG("Kernel tracer version does not support session rotations"); | |
4150 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
4151 | goto error; | |
4152 | } | |
4153 | ||
66ea93b1 JG |
4154 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; |
4155 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; | |
4156 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; | |
4157 | ||
259c2674 | 4158 | ret = cmd_rotation_set_schedule(cmd_ctx->session, |
66ea93b1 JG |
4159 | set_schedule, |
4160 | schedule_type, | |
4161 | value, | |
90936dcf | 4162 | notification_thread_handle); |
a2026546 | 4163 | if (ret != LTTNG_OK) { |
259c2674 JD |
4164 | goto error; |
4165 | } | |
4166 | ||
259c2674 JD |
4167 | break; |
4168 | } | |
66ea93b1 | 4169 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
329f3443 | 4170 | { |
66ea93b1 JG |
4171 | struct lttng_session_list_schedules_return schedules = { |
4172 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
4173 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
4174 | .size.set = !!cmd_ctx->session->rotate_size, | |
4175 | .size.value = cmd_ctx->session->rotate_size, | |
4176 | }; | |
4177 | ||
4178 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
4179 | sizeof(schedules)); | |
329f3443 JD |
4180 | if (ret < 0) { |
4181 | ret = -ret; | |
4182 | goto error; | |
4183 | } | |
4184 | ||
4185 | ret = LTTNG_OK; | |
4186 | break; | |
4187 | } | |
5e16da05 | 4188 | default: |
f73fabfd | 4189 | ret = LTTNG_ERR_UND; |
5461b305 | 4190 | break; |
fac6795d DG |
4191 | } |
4192 | ||
5461b305 | 4193 | error: |
5461b305 DG |
4194 | if (cmd_ctx->llm == NULL) { |
4195 | DBG("Missing llm structure. Allocating one."); | |
6e10c9b9 | 4196 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
5461b305 DG |
4197 | goto setup_error; |
4198 | } | |
4199 | } | |
54d01ffb | 4200 | /* Set return code */ |
5461b305 | 4201 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 4202 | setup_error: |
b5541356 | 4203 | if (cmd_ctx->session) { |
54d01ffb | 4204 | session_unlock(cmd_ctx->session); |
e32d7f27 | 4205 | session_put(cmd_ctx->session); |
b5541356 | 4206 | } |
256a5576 MD |
4207 | if (need_tracing_session) { |
4208 | session_unlock_list(); | |
4209 | } | |
54d01ffb | 4210 | init_setup_error: |
3745d315 | 4211 | assert(!rcu_read_ongoing()); |
8028d920 | 4212 | return ret; |
fac6795d DG |
4213 | } |
4214 | ||
44a5e5eb DG |
4215 | /* |
4216 | * Thread managing health check socket. | |
4217 | */ | |
4218 | static void *thread_manage_health(void *data) | |
4219 | { | |
eb4a2943 | 4220 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
4221 | uint32_t revents, nb_fd; |
4222 | struct lttng_poll_event events; | |
0c89d795 MD |
4223 | struct health_comm_msg msg; |
4224 | struct health_comm_reply reply; | |
44a5e5eb DG |
4225 | |
4226 | DBG("[thread] Manage health check started"); | |
4227 | ||
4228 | rcu_register_thread(); | |
4229 | ||
6d737ce4 DG |
4230 | /* We might hit an error path before this is created. */ |
4231 | lttng_poll_init(&events); | |
3cc04881 | 4232 | |
44a5e5eb | 4233 | /* Create unix socket */ |
e6142f2e | 4234 | sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value); |
44a5e5eb DG |
4235 | if (sock < 0) { |
4236 | ERR("Unable to create health check Unix socket"); | |
44a5e5eb DG |
4237 | goto error; |
4238 | } | |
4239 | ||
6c71277b MD |
4240 | if (is_root) { |
4241 | /* lttng health client socket path permissions */ | |
e6142f2e JG |
4242 | ret = chown(config.health_unix_sock_path.value, 0, |
4243 | utils_get_group_id(config.tracing_group_name.value)); | |
6c71277b | 4244 | if (ret < 0) { |
e6142f2e | 4245 | ERR("Unable to set group on %s", config.health_unix_sock_path.value); |
6c71277b | 4246 | PERROR("chown"); |
6c71277b MD |
4247 | goto error; |
4248 | } | |
4249 | ||
e6142f2e | 4250 | ret = chmod(config.health_unix_sock_path.value, |
6c71277b MD |
4251 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
4252 | if (ret < 0) { | |
e6142f2e | 4253 | ERR("Unable to set permissions on %s", config.health_unix_sock_path.value); |
6c71277b | 4254 | PERROR("chmod"); |
6c71277b MD |
4255 | goto error; |
4256 | } | |
4257 | } | |
4258 | ||
b662582b DG |
4259 | /* |
4260 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4261 | * show must go on. | |
4262 | */ | |
4263 | (void) utils_set_fd_cloexec(sock); | |
4264 | ||
44a5e5eb DG |
4265 | ret = lttcomm_listen_unix_sock(sock); |
4266 | if (ret < 0) { | |
4267 | goto error; | |
4268 | } | |
4269 | ||
4270 | /* | |
4271 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4272 | * more will be added to this poll set. | |
4273 | */ | |
d0b96690 | 4274 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
4275 | if (ret < 0) { |
4276 | goto error; | |
4277 | } | |
4278 | ||
4279 | /* Add the application registration socket */ | |
4280 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
4281 | if (ret < 0) { | |
4282 | goto error; | |
4283 | } | |
4284 | ||
ef367a93 | 4285 | sessiond_notify_ready(); |
97bc1426 | 4286 | |
44a5e5eb DG |
4287 | while (1) { |
4288 | DBG("Health check ready"); | |
4289 | ||
44a5e5eb DG |
4290 | /* Inifinite blocking call, waiting for transmission */ |
4291 | restart: | |
4292 | ret = lttng_poll_wait(&events, -1); | |
4293 | if (ret < 0) { | |
4294 | /* | |
4295 | * Restart interrupted system call. | |
4296 | */ | |
4297 | if (errno == EINTR) { | |
4298 | goto restart; | |
4299 | } | |
4300 | goto error; | |
4301 | } | |
4302 | ||
0d9c5d77 DG |
4303 | nb_fd = ret; |
4304 | ||
44a5e5eb DG |
4305 | for (i = 0; i < nb_fd; i++) { |
4306 | /* Fetch once the poll data */ | |
4307 | revents = LTTNG_POLL_GETEV(&events, i); | |
4308 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4309 | ||
fd20dac9 MD |
4310 | if (!revents) { |
4311 | /* No activity for this FD (poll implementation). */ | |
4312 | continue; | |
4313 | } | |
4314 | ||
44a5e5eb | 4315 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4316 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 4317 | if (ret) { |
139ac872 MD |
4318 | err = 0; |
4319 | goto exit; | |
44a5e5eb DG |
4320 | } |
4321 | ||
4322 | /* Event on the registration socket */ | |
4323 | if (pollfd == sock) { | |
03e43155 MD |
4324 | if (revents & LPOLLIN) { |
4325 | continue; | |
4326 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
44a5e5eb DG |
4327 | ERR("Health socket poll error"); |
4328 | goto error; | |
03e43155 MD |
4329 | } else { |
4330 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4331 | goto error; | |
44a5e5eb DG |
4332 | } |
4333 | } | |
4334 | } | |
4335 | ||
4336 | new_sock = lttcomm_accept_unix_sock(sock); | |
4337 | if (new_sock < 0) { | |
4338 | goto error; | |
4339 | } | |
4340 | ||
b662582b DG |
4341 | /* |
4342 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4343 | * show must go on. | |
4344 | */ | |
4345 | (void) utils_set_fd_cloexec(new_sock); | |
4346 | ||
44a5e5eb DG |
4347 | DBG("Receiving data from client for health..."); |
4348 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
4349 | if (ret <= 0) { | |
4350 | DBG("Nothing recv() from client... continuing"); | |
4351 | ret = close(new_sock); | |
4352 | if (ret) { | |
4353 | PERROR("close"); | |
4354 | } | |
44a5e5eb DG |
4355 | continue; |
4356 | } | |
4357 | ||
4358 | rcu_thread_online(); | |
4359 | ||
53efb85a | 4360 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
4361 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
4362 | /* | |
4363 | * health_check_state returns 0 if health is | |
4364 | * bad. | |
4365 | */ | |
4366 | if (!health_check_state(health_sessiond, i)) { | |
4367 | reply.ret_code |= 1ULL << i; | |
4368 | } | |
44a5e5eb DG |
4369 | } |
4370 | ||
6c71277b | 4371 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
4372 | |
4373 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
4374 | if (ret < 0) { | |
4375 | ERR("Failed to send health data back to client"); | |
4376 | } | |
4377 | ||
4378 | /* End of transmission */ | |
4379 | ret = close(new_sock); | |
4380 | if (ret) { | |
4381 | PERROR("close"); | |
4382 | } | |
44a5e5eb DG |
4383 | } |
4384 | ||
139ac872 | 4385 | exit: |
44a5e5eb | 4386 | error: |
139ac872 MD |
4387 | if (err) { |
4388 | ERR("Health error occurred in %s", __func__); | |
4389 | } | |
44a5e5eb | 4390 | DBG("Health check thread dying"); |
e6142f2e | 4391 | unlink(config.health_unix_sock_path.value); |
44a5e5eb DG |
4392 | if (sock >= 0) { |
4393 | ret = close(sock); | |
4394 | if (ret) { | |
4395 | PERROR("close"); | |
4396 | } | |
4397 | } | |
44a5e5eb DG |
4398 | |
4399 | lttng_poll_clean(&events); | |
b11d6a7f | 4400 | stop_threads(); |
44a5e5eb DG |
4401 | rcu_unregister_thread(); |
4402 | return NULL; | |
4403 | } | |
4404 | ||
1d4b027a | 4405 | /* |
d063d709 DG |
4406 | * This thread manage all clients request using the unix client socket for |
4407 | * communication. | |
1d4b027a DG |
4408 | */ |
4409 | static void *thread_manage_clients(void *data) | |
4410 | { | |
139ac872 | 4411 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 4412 | int sock_error; |
5eb91c98 | 4413 | uint32_t revents, nb_fd; |
273ea72c | 4414 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4415 | struct lttng_poll_event events; |
1d4b027a DG |
4416 | |
4417 | DBG("[thread] Manage client started"); | |
4418 | ||
f6a9efaa DG |
4419 | rcu_register_thread(); |
4420 | ||
6c71277b | 4421 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 4422 | |
840cb59c | 4423 | health_code_update(); |
44a5e5eb | 4424 | |
1d4b027a DG |
4425 | ret = lttcomm_listen_unix_sock(client_sock); |
4426 | if (ret < 0) { | |
35df2755 | 4427 | goto error_listen; |
1d4b027a DG |
4428 | } |
4429 | ||
5eb91c98 DG |
4430 | /* |
4431 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4432 | * more will be added to this poll set. | |
4433 | */ | |
d0b96690 | 4434 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 4435 | if (ret < 0) { |
35df2755 | 4436 | goto error_create_poll; |
5eb91c98 | 4437 | } |
273ea72c | 4438 | |
5eb91c98 DG |
4439 | /* Add the application registration socket */ |
4440 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4441 | if (ret < 0) { | |
4442 | goto error; | |
4443 | } | |
273ea72c | 4444 | |
ef367a93 JG |
4445 | ret = sem_post(&load_info->message_thread_ready); |
4446 | if (ret) { | |
4447 | PERROR("sem_post message_thread_ready"); | |
4448 | goto error; | |
4449 | } | |
0bb7724a | 4450 | |
f28f9e44 JG |
4451 | /* |
4452 | * Wait until all support threads are initialized before accepting | |
4453 | * commands. | |
4454 | */ | |
4455 | while (uatomic_read(<tng_sessiond_ready) != 0) { | |
f28f9e44 JG |
4456 | /* |
4457 | * If a support thread failed to launch, it may signal that | |
4458 | * we must exit and the sessiond would never be marked as | |
4459 | * "ready". | |
4460 | * | |
4461 | * The timeout is set to 1ms, which serves as a way to | |
4462 | * pace down this check. | |
4463 | */ | |
a7333da7 JG |
4464 | ret = sessiond_wait_for_quit_pipe(1000); |
4465 | if (ret > 0) { | |
f28f9e44 JG |
4466 | goto exit; |
4467 | } | |
4468 | } | |
8b0d4636 JG |
4469 | /* |
4470 | * This barrier is paired with the one in sessiond_notify_ready() to | |
4471 | * ensure that loads accessing data initialized by the other threads, | |
4472 | * on which this thread was waiting, are not performed before this point. | |
4473 | * | |
4474 | * Note that this could be a 'read' memory barrier, but a full barrier | |
4475 | * is used in case the code changes. The performance implications of | |
4476 | * this choice are minimal since this is a slow path. | |
4477 | */ | |
4478 | cmm_smp_mb(); | |
f28f9e44 | 4479 | |
72453c8c MD |
4480 | /* This testpoint is after we signal readiness to the parent. */ |
4481 | if (testpoint(sessiond_thread_manage_clients)) { | |
4482 | goto error; | |
4483 | } | |
4484 | ||
e547b070 | 4485 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
4486 | goto error; |
4487 | } | |
8ac94142 | 4488 | |
840cb59c | 4489 | health_code_update(); |
44a5e5eb | 4490 | |
1d4b027a | 4491 | while (1) { |
a503e1ef JG |
4492 | const struct cmd_completion_handler *cmd_completion_handler; |
4493 | ||
1d4b027a | 4494 | DBG("Accepting client command ..."); |
273ea72c DG |
4495 | |
4496 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 4497 | restart: |
a78af745 | 4498 | health_poll_entry(); |
5eb91c98 | 4499 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 4500 | health_poll_exit(); |
273ea72c | 4501 | if (ret < 0) { |
88f2b785 MD |
4502 | /* |
4503 | * Restart interrupted system call. | |
4504 | */ | |
4505 | if (errno == EINTR) { | |
4506 | goto restart; | |
4507 | } | |
273ea72c DG |
4508 | goto error; |
4509 | } | |
4510 | ||
0d9c5d77 DG |
4511 | nb_fd = ret; |
4512 | ||
5eb91c98 DG |
4513 | for (i = 0; i < nb_fd; i++) { |
4514 | /* Fetch once the poll data */ | |
4515 | revents = LTTNG_POLL_GETEV(&events, i); | |
4516 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4517 | ||
840cb59c | 4518 | health_code_update(); |
44a5e5eb | 4519 | |
fd20dac9 MD |
4520 | if (!revents) { |
4521 | /* No activity for this FD (poll implementation). */ | |
4522 | continue; | |
4523 | } | |
4524 | ||
5eb91c98 | 4525 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4526 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 4527 | if (ret) { |
139ac872 MD |
4528 | err = 0; |
4529 | goto exit; | |
5eb91c98 DG |
4530 | } |
4531 | ||
4532 | /* Event on the registration socket */ | |
4533 | if (pollfd == client_sock) { | |
03e43155 MD |
4534 | if (revents & LPOLLIN) { |
4535 | continue; | |
4536 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
5eb91c98 DG |
4537 | ERR("Client socket poll error"); |
4538 | goto error; | |
03e43155 MD |
4539 | } else { |
4540 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4541 | goto error; | |
5eb91c98 DG |
4542 | } |
4543 | } | |
4544 | } | |
4545 | ||
4546 | DBG("Wait for client response"); | |
4547 | ||
840cb59c | 4548 | health_code_update(); |
44a5e5eb | 4549 | |
5eb91c98 DG |
4550 | sock = lttcomm_accept_unix_sock(client_sock); |
4551 | if (sock < 0) { | |
273ea72c | 4552 | goto error; |
273ea72c DG |
4553 | } |
4554 | ||
b662582b DG |
4555 | /* |
4556 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4557 | * show must go on. | |
4558 | */ | |
4559 | (void) utils_set_fd_cloexec(sock); | |
4560 | ||
be040666 DG |
4561 | /* Set socket option for credentials retrieval */ |
4562 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4563 | if (ret < 0) { | |
4564 | goto error; | |
4565 | } | |
4566 | ||
5eb91c98 | 4567 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4568 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4569 | if (cmd_ctx == NULL) { |
76d7553f | 4570 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4571 | goto error; |
5eb91c98 | 4572 | } |
1d4b027a | 4573 | |
5eb91c98 | 4574 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4575 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4576 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4577 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4578 | goto error; |
4579 | } | |
1d4b027a | 4580 | |
5eb91c98 DG |
4581 | cmd_ctx->llm = NULL; |
4582 | cmd_ctx->session = NULL; | |
1d4b027a | 4583 | |
840cb59c | 4584 | health_code_update(); |
44a5e5eb | 4585 | |
5eb91c98 DG |
4586 | /* |
4587 | * Data is received from the lttng client. The struct | |
4588 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4589 | * the client. | |
4590 | */ | |
4591 | DBG("Receiving data from client ..."); | |
be040666 DG |
4592 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4593 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4594 | if (ret <= 0) { |
4595 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4596 | ret = close(sock); |
4597 | if (ret) { | |
4598 | PERROR("close"); | |
4599 | } | |
4600 | sock = -1; | |
a2c0da86 | 4601 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4602 | continue; |
4603 | } | |
1d4b027a | 4604 | |
840cb59c | 4605 | health_code_update(); |
44a5e5eb | 4606 | |
5eb91c98 DG |
4607 | // TODO: Validate cmd_ctx including sanity check for |
4608 | // security purpose. | |
f7776ea7 | 4609 | |
f6a9efaa | 4610 | rcu_thread_online(); |
5eb91c98 DG |
4611 | /* |
4612 | * This function dispatch the work to the kernel or userspace tracer | |
4613 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4614 | * informations for the client. The command context struct contains | |
4615 | * everything this function may needs. | |
4616 | */ | |
53a80697 | 4617 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4618 | rcu_thread_offline(); |
5eb91c98 | 4619 | if (ret < 0) { |
36134aa1 DG |
4620 | ret = close(sock); |
4621 | if (ret) { | |
4622 | PERROR("close"); | |
53a80697 | 4623 | } |
36134aa1 | 4624 | sock = -1; |
bbd973c2 | 4625 | /* |
5eb91c98 | 4626 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4627 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4628 | * (ENOMEM). Error detected but still accept |
4629 | * command, unless a socket error has been | |
4630 | * detected. | |
bbd973c2 | 4631 | */ |
bbd973c2 | 4632 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4633 | continue; |
4634 | } | |
d6e4fca4 | 4635 | |
a503e1ef JG |
4636 | cmd_completion_handler = cmd_pop_completion_handler(); |
4637 | if (cmd_completion_handler) { | |
4638 | enum lttng_error_code completion_code; | |
4639 | ||
4640 | completion_code = cmd_completion_handler->run( | |
4641 | cmd_completion_handler->data); | |
4642 | if (completion_code != LTTNG_OK) { | |
4643 | clean_command_ctx(&cmd_ctx); | |
4644 | continue; | |
4645 | } | |
4646 | } | |
4647 | ||
840cb59c | 4648 | health_code_update(); |
44a5e5eb | 4649 | |
a1ac8b97 | 4650 | DBG("Sending response (size: %d, retcode: %s (%d))", |
54d01ffb | 4651 | cmd_ctx->lttng_msg_size, |
a1ac8b97 JG |
4652 | lttng_strerror(-cmd_ctx->llm->ret_code), |
4653 | cmd_ctx->llm->ret_code); | |
54d01ffb | 4654 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4655 | if (ret < 0) { |
4656 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4657 | } |
1d4b027a | 4658 | |
5eb91c98 | 4659 | /* End of transmission */ |
76d7553f MD |
4660 | ret = close(sock); |
4661 | if (ret) { | |
4662 | PERROR("close"); | |
4663 | } | |
4664 | sock = -1; | |
be040666 DG |
4665 | |
4666 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4667 | |
840cb59c | 4668 | health_code_update(); |
273ea72c DG |
4669 | } |
4670 | ||
139ac872 | 4671 | exit: |
5eb91c98 | 4672 | error: |
35df2755 CB |
4673 | if (sock >= 0) { |
4674 | ret = close(sock); | |
4675 | if (ret) { | |
4676 | PERROR("close"); | |
4677 | } | |
139ac872 | 4678 | } |
44a5e5eb | 4679 | |
35df2755 CB |
4680 | lttng_poll_clean(&events); |
4681 | clean_command_ctx(&cmd_ctx); | |
4682 | ||
4683 | error_listen: | |
4684 | error_create_poll: | |
e6142f2e | 4685 | unlink(config.client_unix_sock_path.value); |
76d7553f MD |
4686 | if (client_sock >= 0) { |
4687 | ret = close(client_sock); | |
4688 | if (ret) { | |
4689 | PERROR("close"); | |
4690 | } | |
a4b35e07 | 4691 | } |
35df2755 CB |
4692 | |
4693 | if (err) { | |
840cb59c | 4694 | health_error(); |
35df2755 | 4695 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4696 | } |
273ea72c | 4697 | |
8782cc74 | 4698 | health_unregister(health_sessiond); |
35df2755 CB |
4699 | |
4700 | DBG("Client thread dying"); | |
f6a9efaa DG |
4701 | |
4702 | rcu_unregister_thread(); | |
4a15001e MD |
4703 | |
4704 | /* | |
4705 | * Since we are creating the consumer threads, we own them, so we need | |
4706 | * to join them before our thread exits. | |
4707 | */ | |
4708 | ret = join_consumer_thread(&kconsumer_data); | |
4709 | if (ret) { | |
4710 | errno = ret; | |
4711 | PERROR("join_consumer"); | |
4712 | } | |
4713 | ||
4714 | ret = join_consumer_thread(&ustconsumer32_data); | |
4715 | if (ret) { | |
4716 | errno = ret; | |
4717 | PERROR("join_consumer ust32"); | |
4718 | } | |
4719 | ||
4720 | ret = join_consumer_thread(&ustconsumer64_data); | |
4721 | if (ret) { | |
4722 | errno = ret; | |
4723 | PERROR("join_consumer ust64"); | |
4724 | } | |
1d4b027a DG |
4725 | return NULL; |
4726 | } | |
4727 | ||
c0232ea5 JG |
4728 | static int string_match(const char *str1, const char *str2) |
4729 | { | |
4730 | return (str1 && str2) && !strcmp(str1, str2); | |
4731 | } | |
4732 | ||
fac6795d | 4733 | /* |
26296c48 JG |
4734 | * Take an option from the getopt output and set it in the right variable to be |
4735 | * used later. | |
4736 | * | |
4737 | * Return 0 on success else a negative value. | |
fac6795d | 4738 | */ |
26296c48 | 4739 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4740 | { |
26296c48 | 4741 | int ret = 0; |
fac6795d | 4742 | |
c0232ea5 | 4743 | if (string_match(optname, "client-sock") || opt == 'c') { |
66b2ce8e JG |
4744 | if (!arg || *arg == '\0') { |
4745 | ret = -EINVAL; | |
4746 | goto end; | |
4747 | } | |
e8fa9fb0 MD |
4748 | if (lttng_is_setuid_setgid()) { |
4749 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4750 | "-c, --client-sock"); | |
4751 | } else { | |
e6142f2e JG |
4752 | config_string_set(&config.client_unix_sock_path, |
4753 | strdup(arg)); | |
4754 | if (!config.client_unix_sock_path.value) { | |
4755 | ret = -ENOMEM; | |
4756 | PERROR("strdup"); | |
4757 | } | |
e8fa9fb0 | 4758 | } |
c0232ea5 | 4759 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
66b2ce8e JG |
4760 | if (!arg || *arg == '\0') { |
4761 | ret = -EINVAL; | |
4762 | goto end; | |
4763 | } | |
e8fa9fb0 MD |
4764 | if (lttng_is_setuid_setgid()) { |
4765 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4766 | "-a, --apps-sock"); | |
4767 | } else { | |
e6142f2e JG |
4768 | config_string_set(&config.apps_unix_sock_path, |
4769 | strdup(arg)); | |
4770 | if (!config.apps_unix_sock_path.value) { | |
4771 | ret = -ENOMEM; | |
4772 | PERROR("strdup"); | |
4773 | } | |
e8fa9fb0 | 4774 | } |
c0232ea5 | 4775 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
e6142f2e | 4776 | config.daemonize = true; |
c0232ea5 | 4777 | } else if (string_match(optname, "background") || opt == 'b') { |
e6142f2e | 4778 | config.background = true; |
c0232ea5 | 4779 | } else if (string_match(optname, "group") || opt == 'g') { |
66b2ce8e JG |
4780 | if (!arg || *arg == '\0') { |
4781 | ret = -EINVAL; | |
4782 | goto end; | |
4783 | } | |
e8fa9fb0 MD |
4784 | if (lttng_is_setuid_setgid()) { |
4785 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4786 | "-g, --group"); | |
4787 | } else { | |
e6142f2e JG |
4788 | config_string_set(&config.tracing_group_name, |
4789 | strdup(arg)); | |
4790 | if (!config.tracing_group_name.value) { | |
e8fa9fb0 | 4791 | ret = -ENOMEM; |
e6142f2e | 4792 | PERROR("strdup"); |
e8fa9fb0 | 4793 | } |
db322c4d | 4794 | } |
c0232ea5 | 4795 | } else if (string_match(optname, "help") || opt == 'h') { |
4fc83d94 | 4796 | ret = utils_show_help(8, "lttng-sessiond", help_msg); |
8190767e | 4797 | if (ret) { |
4fc83d94 | 4798 | ERR("Cannot show --help for `lttng-sessiond`"); |
8190767e PP |
4799 | perror("exec"); |
4800 | } | |
4801 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
c0232ea5 | 4802 | } else if (string_match(optname, "version") || opt == 'V') { |
26296c48 JG |
4803 | fprintf(stdout, "%s\n", VERSION); |
4804 | exit(EXIT_SUCCESS); | |
c0232ea5 | 4805 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
e6142f2e | 4806 | config.sig_parent = true; |
c0232ea5 | 4807 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
66b2ce8e JG |
4808 | if (!arg || *arg == '\0') { |
4809 | ret = -EINVAL; | |
4810 | goto end; | |
4811 | } | |
e8fa9fb0 MD |
4812 | if (lttng_is_setuid_setgid()) { |
4813 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4814 | "--kconsumerd-err-sock"); | |
4815 | } else { | |
e6142f2e JG |
4816 | config_string_set(&config.kconsumerd_err_unix_sock_path, |
4817 | strdup(arg)); | |
4818 | if (!config.kconsumerd_err_unix_sock_path.value) { | |
4819 | ret = -ENOMEM; | |
4820 | PERROR("strdup"); | |
4821 | } | |
e8fa9fb0 | 4822 | } |
c0232ea5 | 4823 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
66b2ce8e JG |
4824 | if (!arg || *arg == '\0') { |
4825 | ret = -EINVAL; | |
4826 | goto end; | |
4827 | } | |
e8fa9fb0 MD |
4828 | if (lttng_is_setuid_setgid()) { |
4829 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4830 | "--kconsumerd-cmd-sock"); | |
4831 | } else { | |
e6142f2e JG |
4832 | config_string_set(&config.kconsumerd_cmd_unix_sock_path, |
4833 | strdup(arg)); | |
4834 | if (!config.kconsumerd_cmd_unix_sock_path.value) { | |
4835 | ret = -ENOMEM; | |
4836 | PERROR("strdup"); | |
4837 | } | |
e8fa9fb0 | 4838 | } |
c0232ea5 | 4839 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
66b2ce8e JG |
4840 | if (!arg || *arg == '\0') { |
4841 | ret = -EINVAL; | |
4842 | goto end; | |
4843 | } | |
e8fa9fb0 MD |
4844 | if (lttng_is_setuid_setgid()) { |
4845 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4846 | "--ustconsumerd64-err-sock"); | |
4847 | } else { | |
e6142f2e JG |
4848 | config_string_set(&config.consumerd64_err_unix_sock_path, |
4849 | strdup(arg)); | |
4850 | if (!config.consumerd64_err_unix_sock_path.value) { | |
4851 | ret = -ENOMEM; | |
4852 | PERROR("strdup"); | |
4853 | } | |
e8fa9fb0 | 4854 | } |
c0232ea5 | 4855 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
66b2ce8e JG |
4856 | if (!arg || *arg == '\0') { |
4857 | ret = -EINVAL; | |
4858 | goto end; | |
4859 | } | |
e8fa9fb0 MD |
4860 | if (lttng_is_setuid_setgid()) { |
4861 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4862 | "--ustconsumerd64-cmd-sock"); | |
4863 | } else { | |
e6142f2e JG |
4864 | config_string_set(&config.consumerd64_cmd_unix_sock_path, |
4865 | strdup(arg)); | |
4866 | if (!config.consumerd64_cmd_unix_sock_path.value) { | |
4867 | ret = -ENOMEM; | |
4868 | PERROR("strdup"); | |
4869 | } | |
e8fa9fb0 | 4870 | } |
c0232ea5 | 4871 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
66b2ce8e JG |
4872 | if (!arg || *arg == '\0') { |
4873 | ret = -EINVAL; | |
4874 | goto end; | |
4875 | } | |
e8fa9fb0 MD |
4876 | if (lttng_is_setuid_setgid()) { |
4877 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4878 | "--ustconsumerd32-err-sock"); | |
4879 | } else { | |
e6142f2e JG |
4880 | config_string_set(&config.consumerd32_err_unix_sock_path, |
4881 | strdup(arg)); | |
4882 | if (!config.consumerd32_err_unix_sock_path.value) { | |
4883 | ret = -ENOMEM; | |
4884 | PERROR("strdup"); | |
4885 | } | |
e8fa9fb0 | 4886 | } |
c0232ea5 | 4887 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
66b2ce8e JG |
4888 | if (!arg || *arg == '\0') { |
4889 | ret = -EINVAL; | |
4890 | goto end; | |
4891 | } | |
e8fa9fb0 MD |
4892 | if (lttng_is_setuid_setgid()) { |
4893 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4894 | "--ustconsumerd32-cmd-sock"); | |
4895 | } else { | |
e6142f2e JG |
4896 | config_string_set(&config.consumerd32_cmd_unix_sock_path, |
4897 | strdup(arg)); | |
4898 | if (!config.consumerd32_cmd_unix_sock_path.value) { | |
4899 | ret = -ENOMEM; | |
4900 | PERROR("strdup"); | |
4901 | } | |
e8fa9fb0 | 4902 | } |
c0232ea5 | 4903 | } else if (string_match(optname, "no-kernel")) { |
e6142f2e | 4904 | config.no_kernel = true; |
c0232ea5 | 4905 | } else if (string_match(optname, "quiet") || opt == 'q') { |
6d9a9c65 | 4906 | config.quiet = true; |
c0232ea5 | 4907 | } else if (string_match(optname, "verbose") || opt == 'v') { |
26296c48 JG |
4908 | /* Verbose level can increase using multiple -v */ |
4909 | if (arg) { | |
13755a18 | 4910 | /* Value obtained from config file */ |
e6142f2e | 4911 | config.verbose = config_parse_value(arg); |
26296c48 | 4912 | } else { |
13755a18 | 4913 | /* -v used on command line */ |
e6142f2e | 4914 | config.verbose++; |
26296c48 | 4915 | } |
13755a18 | 4916 | /* Clamp value to [0, 3] */ |
e6142f2e JG |
4917 | config.verbose = config.verbose < 0 ? 0 : |
4918 | (config.verbose <= 3 ? config.verbose : 3); | |
c0232ea5 | 4919 | } else if (string_match(optname, "verbose-consumer")) { |
26296c48 | 4920 | if (arg) { |
e6142f2e | 4921 | config.verbose_consumer = config_parse_value(arg); |
26296c48 | 4922 | } else { |
e6142f2e | 4923 | config.verbose_consumer++; |
26296c48 | 4924 | } |
c0232ea5 | 4925 | } else if (string_match(optname, "consumerd32-path")) { |
66b2ce8e JG |
4926 | if (!arg || *arg == '\0') { |
4927 | ret = -EINVAL; | |
4928 | goto end; | |
4929 | } | |
e8fa9fb0 MD |
4930 | if (lttng_is_setuid_setgid()) { |
4931 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4932 | "--consumerd32-path"); | |
4933 | } else { | |
e6142f2e JG |
4934 | config_string_set(&config.consumerd32_bin_path, |
4935 | strdup(arg)); | |
4936 | if (!config.consumerd32_bin_path.value) { | |
e8fa9fb0 MD |
4937 | PERROR("strdup"); |
4938 | ret = -ENOMEM; | |
4939 | } | |
db322c4d | 4940 | } |
c0232ea5 | 4941 | } else if (string_match(optname, "consumerd32-libdir")) { |
66b2ce8e JG |
4942 | if (!arg || *arg == '\0') { |
4943 | ret = -EINVAL; | |
4944 | goto end; | |
4945 | } | |
e8fa9fb0 MD |
4946 | if (lttng_is_setuid_setgid()) { |
4947 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4948 | "--consumerd32-libdir"); | |
4949 | } else { | |
e6142f2e JG |
4950 | config_string_set(&config.consumerd32_lib_dir, |
4951 | strdup(arg)); | |
4952 | if (!config.consumerd32_lib_dir.value) { | |
e8fa9fb0 MD |
4953 | PERROR("strdup"); |
4954 | ret = -ENOMEM; | |
4955 | } | |
db322c4d | 4956 | } |
c0232ea5 | 4957 | } else if (string_match(optname, "consumerd64-path")) { |
66b2ce8e JG |
4958 | if (!arg || *arg == '\0') { |
4959 | ret = -EINVAL; | |
4960 | goto end; | |
4961 | } | |
e8fa9fb0 MD |
4962 | if (lttng_is_setuid_setgid()) { |
4963 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4964 | "--consumerd64-path"); | |
4965 | } else { | |
e6142f2e JG |
4966 | config_string_set(&config.consumerd64_bin_path, |
4967 | strdup(arg)); | |
4968 | if (!config.consumerd64_bin_path.value) { | |
e8fa9fb0 MD |
4969 | PERROR("strdup"); |
4970 | ret = -ENOMEM; | |
4971 | } | |
db322c4d | 4972 | } |
c0232ea5 | 4973 | } else if (string_match(optname, "consumerd64-libdir")) { |
66b2ce8e JG |
4974 | if (!arg || *arg == '\0') { |
4975 | ret = -EINVAL; | |
4976 | goto end; | |
4977 | } | |
e8fa9fb0 MD |
4978 | if (lttng_is_setuid_setgid()) { |
4979 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4980 | "--consumerd64-libdir"); | |
4981 | } else { | |
e6142f2e JG |
4982 | config_string_set(&config.consumerd64_lib_dir, |
4983 | strdup(arg)); | |
4984 | if (!config.consumerd64_lib_dir.value) { | |
e8fa9fb0 MD |
4985 | PERROR("strdup"); |
4986 | ret = -ENOMEM; | |
4987 | } | |
db322c4d | 4988 | } |
c0232ea5 | 4989 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
66b2ce8e JG |
4990 | if (!arg || *arg == '\0') { |
4991 | ret = -EINVAL; | |
4992 | goto end; | |
4993 | } | |
e8fa9fb0 MD |
4994 | if (lttng_is_setuid_setgid()) { |
4995 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4996 | "-p, --pidfile"); | |
4997 | } else { | |
e6142f2e JG |
4998 | config_string_set(&config.pid_file_path, strdup(arg)); |
4999 | if (!config.pid_file_path.value) { | |
e8fa9fb0 MD |
5000 | PERROR("strdup"); |
5001 | ret = -ENOMEM; | |
5002 | } | |
db322c4d | 5003 | } |
c0232ea5 | 5004 | } else if (string_match(optname, "agent-tcp-port")) { |
66b2ce8e JG |
5005 | if (!arg || *arg == '\0') { |
5006 | ret = -EINVAL; | |
5007 | goto end; | |
5008 | } | |
e8fa9fb0 MD |
5009 | if (lttng_is_setuid_setgid()) { |
5010 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5011 | "--agent-tcp-port"); | |
5012 | } else { | |
5013 | unsigned long v; | |
4d076222 | 5014 | |
e8fa9fb0 MD |
5015 | errno = 0; |
5016 | v = strtoul(arg, NULL, 0); | |
5017 | if (errno != 0 || !isdigit(arg[0])) { | |
5018 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); | |
5019 | return -1; | |
5020 | } | |
5021 | if (v == 0 || v >= 65535) { | |
5022 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); | |
5023 | return -1; | |
5024 | } | |
2288467f JG |
5025 | config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v; |
5026 | DBG3("Agent TCP port set to non default: %i", (int) v); | |
26296c48 | 5027 | } |
c0232ea5 | 5028 | } else if (string_match(optname, "load") || opt == 'l') { |
66b2ce8e JG |
5029 | if (!arg || *arg == '\0') { |
5030 | ret = -EINVAL; | |
5031 | goto end; | |
5032 | } | |
e8fa9fb0 MD |
5033 | if (lttng_is_setuid_setgid()) { |
5034 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5035 | "-l, --load"); | |
5036 | } else { | |
e6142f2e JG |
5037 | config_string_set(&config.load_session_path, strdup(arg)); |
5038 | if (!config.load_session_path.value) { | |
e8fa9fb0 MD |
5039 | PERROR("strdup"); |
5040 | ret = -ENOMEM; | |
5041 | } | |
ef367a93 | 5042 | } |
c0232ea5 | 5043 | } else if (string_match(optname, "kmod-probes")) { |
66b2ce8e JG |
5044 | if (!arg || *arg == '\0') { |
5045 | ret = -EINVAL; | |
5046 | goto end; | |
5047 | } | |
e8fa9fb0 MD |
5048 | if (lttng_is_setuid_setgid()) { |
5049 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5050 | "--kmod-probes"); | |
5051 | } else { | |
e6142f2e JG |
5052 | config_string_set(&config.kmod_probes_list, strdup(arg)); |
5053 | if (!config.kmod_probes_list.value) { | |
e8fa9fb0 MD |
5054 | PERROR("strdup"); |
5055 | ret = -ENOMEM; | |
5056 | } | |
c9d42407 | 5057 | } |
c0232ea5 | 5058 | } else if (string_match(optname, "extra-kmod-probes")) { |
66b2ce8e JG |
5059 | if (!arg || *arg == '\0') { |
5060 | ret = -EINVAL; | |
5061 | goto end; | |
5062 | } | |
e8fa9fb0 MD |
5063 | if (lttng_is_setuid_setgid()) { |
5064 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5065 | "--extra-kmod-probes"); | |
5066 | } else { | |
e6142f2e JG |
5067 | config_string_set(&config.kmod_extra_probes_list, |
5068 | strdup(arg)); | |
5069 | if (!config.kmod_extra_probes_list.value) { | |
e8fa9fb0 MD |
5070 | PERROR("strdup"); |
5071 | ret = -ENOMEM; | |
5072 | } | |
db322c4d | 5073 | } |
c0232ea5 JG |
5074 | } else if (string_match(optname, "config") || opt == 'f') { |
5075 | /* This is handled in set_options() thus silent skip. */ | |
5076 | goto end; | |
5077 | } else { | |
26296c48 JG |
5078 | /* Unknown option or other error. |
5079 | * Error is printed by getopt, just return */ | |
5080 | ret = -1; | |
5081 | } | |
5082 | ||
f3dd7ce7 | 5083 | end: |
c5d350b2 JG |
5084 | if (ret == -EINVAL) { |
5085 | const char *opt_name = "unknown"; | |
5086 | int i; | |
5087 | ||
5088 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); | |
5089 | i++) { | |
5090 | if (opt == long_options[i].val) { | |
5091 | opt_name = long_options[i].name; | |
5092 | break; | |
5093 | } | |
5094 | } | |
5095 | ||
5096 | WARN("Invalid argument provided for option \"%s\", using default value.", | |
5097 | opt_name); | |
5098 | } | |
f3dd7ce7 | 5099 | |
26296c48 JG |
5100 | return ret; |
5101 | } | |
5102 | ||
5103 | /* | |
5104 | * config_entry_handler_cb used to handle options read from a config file. | |
f40ef1d5 | 5105 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
26296c48 JG |
5106 | * return value conventions. |
5107 | */ | |
5108 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
5109 | { | |
5110 | int ret = 0, i; | |
5111 | ||
5112 | if (!entry || !entry->name || !entry->value) { | |
5113 | ret = -EINVAL; | |
5114 | goto end; | |
5115 | } | |
5116 | ||
5117 | /* Check if the option is to be ignored */ | |
5118 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
5119 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
5120 | goto end; | |
5121 | } | |
5122 | } | |
5123 | ||
5124 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
5125 | i++) { | |
5126 | ||
5127 | /* Ignore if not fully matched. */ | |
5128 | if (strcmp(entry->name, long_options[i].name)) { | |
5129 | continue; | |
5130 | } | |
5131 | ||
5132 | /* | |
5133 | * If the option takes no argument on the command line, we have to | |
5134 | * check if the value is "true". We support non-zero numeric values, | |
5135 | * true, on and yes. | |
5136 | */ | |
5137 | if (!long_options[i].has_arg) { | |
5138 | ret = config_parse_value(entry->value); | |
5139 | if (ret <= 0) { | |
5140 | if (ret) { | |
5141 | WARN("Invalid configuration value \"%s\" for option %s", | |
5142 | entry->value, entry->name); | |
5143 | } | |
5144 | /* False, skip boolean config option. */ | |
5145 | goto end; | |
4d076222 | 5146 | } |
26296c48 JG |
5147 | } |
5148 | ||
5149 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
5150 | goto end; | |
5151 | } | |
5152 | ||
5153 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
5154 | ||
5155 | end: | |
5156 | return ret; | |
5157 | } | |
5158 | ||
5159 | /* | |
5160 | * daemon configuration loading and argument parsing | |
5161 | */ | |
5162 | static int set_options(int argc, char **argv) | |
5163 | { | |
5164 | int ret = 0, c = 0, option_index = 0; | |
5165 | int orig_optopt = optopt, orig_optind = optind; | |
5166 | char *optstring; | |
5167 | const char *config_path = NULL; | |
5168 | ||
5169 | optstring = utils_generate_optstring(long_options, | |
5170 | sizeof(long_options) / sizeof(struct option)); | |
5171 | if (!optstring) { | |
5172 | ret = -ENOMEM; | |
5173 | goto end; | |
5174 | } | |
5175 | ||
5176 | /* Check for the --config option */ | |
5177 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
5178 | &option_index)) != -1) { | |
5179 | if (c == '?') { | |
5180 | ret = -EINVAL; | |
5181 | goto end; | |
5182 | } else if (c != 'f') { | |
5183 | /* if not equal to --config option. */ | |
5184 | continue; | |
5185 | } | |
5186 | ||
e8fa9fb0 MD |
5187 | if (lttng_is_setuid_setgid()) { |
5188 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
5189 | "-f, --config"); | |
5190 | } else { | |
5191 | config_path = utils_expand_path(optarg); | |
5192 | if (!config_path) { | |
5193 | ERR("Failed to resolve path: %s", optarg); | |
5194 | } | |
26296c48 JG |
5195 | } |
5196 | } | |
5197 | ||
5198 | ret = config_get_section_entries(config_path, config_section_name, | |
5199 | config_entry_handler, NULL); | |
5200 | if (ret) { | |
5201 | if (ret > 0) { | |
5202 | ERR("Invalid configuration option at line %i", ret); | |
5203 | ret = -1; | |
5204 | } | |
5205 | goto end; | |
5206 | } | |
5207 | ||
5208 | /* Reset getopt's global state */ | |
5209 | optopt = orig_optopt; | |
5210 | optind = orig_optind; | |
5211 | while (1) { | |
c0232ea5 JG |
5212 | option_index = -1; |
5213 | /* | |
5214 | * getopt_long() will not set option_index if it encounters a | |
5215 | * short option. | |
5216 | */ | |
5217 | c = getopt_long(argc, argv, optstring, long_options, | |
5218 | &option_index); | |
26296c48 | 5219 | if (c == -1) { |
4d076222 DG |
5220 | break; |
5221 | } | |
26296c48 | 5222 | |
c0232ea5 JG |
5223 | /* |
5224 | * Pass NULL as the long option name if popt left the index | |
5225 | * unset. | |
5226 | */ | |
5227 | ret = set_option(c, optarg, | |
5228 | option_index < 0 ? NULL : | |
5229 | long_options[option_index].name); | |
26296c48 JG |
5230 | if (ret < 0) { |
5231 | break; | |
fac6795d DG |
5232 | } |
5233 | } | |
5234 | ||
26296c48 JG |
5235 | end: |
5236 | free(optstring); | |
5237 | return ret; | |
fac6795d DG |
5238 | } |
5239 | ||
5240 | /* | |
d063d709 | 5241 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
5242 | * apps_sock - The communication socket for all UST apps. |
5243 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 5244 | */ |
cf3af59e | 5245 | static int init_daemon_socket(void) |
fac6795d DG |
5246 | { |
5247 | int ret = 0; | |
5248 | mode_t old_umask; | |
5249 | ||
5250 | old_umask = umask(0); | |
5251 | ||
5252 | /* Create client tool unix socket */ | |
e6142f2e | 5253 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); |
d6f42150 | 5254 | if (client_sock < 0) { |
e6142f2e | 5255 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); |
fac6795d DG |
5256 | ret = -1; |
5257 | goto end; | |
5258 | } | |
5259 | ||
b662582b DG |
5260 | /* Set the cloexec flag */ |
5261 | ret = utils_set_fd_cloexec(client_sock); | |
5262 | if (ret < 0) { | |
5263 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
5264 | "Continuing but note that the consumer daemon will have a " | |
5265 | "reference to this socket on exec()", client_sock); | |
5266 | } | |
5267 | ||
fac6795d | 5268 | /* File permission MUST be 660 */ |
e6142f2e | 5269 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
fac6795d | 5270 | if (ret < 0) { |
e6142f2e | 5271 | ERR("Set file permissions failed: %s", config.client_unix_sock_path.value); |
76d7553f | 5272 | PERROR("chmod"); |
fac6795d DG |
5273 | goto end; |
5274 | } | |
5275 | ||
5276 | /* Create the application unix socket */ | |
e6142f2e | 5277 | apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value); |
d6f42150 | 5278 | if (apps_sock < 0) { |
e6142f2e | 5279 | ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value); |
fac6795d DG |
5280 | ret = -1; |
5281 | goto end; | |
5282 | } | |
5283 | ||
b662582b DG |
5284 | /* Set the cloexec flag */ |
5285 | ret = utils_set_fd_cloexec(apps_sock); | |
5286 | if (ret < 0) { | |
5287 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
5288 | "Continuing but note that the consumer daemon will have a " | |
5289 | "reference to this socket on exec()", apps_sock); | |
5290 | } | |
5291 | ||
d6f42150 | 5292 | /* File permission MUST be 666 */ |
e6142f2e | 5293 | ret = chmod(config.apps_unix_sock_path.value, |
54d01ffb | 5294 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
fac6795d | 5295 | if (ret < 0) { |
e6142f2e | 5296 | ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value); |
76d7553f | 5297 | PERROR("chmod"); |
fac6795d DG |
5298 | goto end; |
5299 | } | |
5300 | ||
b662582b DG |
5301 | DBG3("Session daemon client socket %d and application socket %d created", |
5302 | client_sock, apps_sock); | |
5303 | ||
fac6795d DG |
5304 | end: |
5305 | umask(old_umask); | |
5306 | return ret; | |
5307 | } | |
5308 | ||
f472090a JG |
5309 | /* |
5310 | * Create lockfile using the rundir and return its fd. | |
5311 | */ | |
5312 | static int create_lockfile(void) | |
5313 | { | |
5314 | return utils_create_lock_file(config.lock_file_path.value); | |
5315 | } | |
5316 | ||
fac6795d | 5317 | /* |
54d01ffb DG |
5318 | * Check if the global socket is available, and if a daemon is answering at the |
5319 | * other side. If yes, error is returned. | |
f472090a JG |
5320 | * |
5321 | * Also attempts to create and hold the lock file. | |
fac6795d | 5322 | */ |
cf3af59e | 5323 | static int check_existing_daemon(void) |
fac6795d | 5324 | { |
f472090a JG |
5325 | int ret = 0; |
5326 | ||
7d8234d9 | 5327 | /* Is there anybody out there ? */ |
099e26bd | 5328 | if (lttng_session_daemon_alive()) { |
f472090a JG |
5329 | ret = -EEXIST; |
5330 | goto end; | |
099e26bd | 5331 | } |
b09c7c76 | 5332 | |
f472090a JG |
5333 | lockfile_fd = create_lockfile(); |
5334 | if (lockfile_fd < 0) { | |
5335 | ret = -EEXIST; | |
5336 | goto end; | |
5337 | } | |
5338 | end: | |
5339 | return ret; | |
5340 | } | |
5341 | ||
5342 | static void sessiond_cleanup_lock_file(void) | |
5343 | { | |
5344 | int ret; | |
5345 | ||
5346 | /* | |
5347 | * Cleanup lock file by deleting it and finaly closing it which will | |
5348 | * release the file system lock. | |
5349 | */ | |
5350 | if (lockfile_fd >= 0) { | |
5351 | ret = remove(config.lock_file_path.value); | |
5352 | if (ret < 0) { | |
5353 | PERROR("remove lock file"); | |
5354 | } | |
5355 | ret = close(lockfile_fd); | |
5356 | if (ret < 0) { | |
5357 | PERROR("close lock file"); | |
5358 | } | |
5359 | } | |
fac6795d DG |
5360 | } |
5361 | ||
fac6795d | 5362 | /* |
d063d709 | 5363 | * Set the tracing group gid onto the client socket. |
5e16da05 | 5364 | * |
d063d709 | 5365 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 5366 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 5367 | */ |
be040666 | 5368 | static int set_permissions(char *rundir) |
fac6795d DG |
5369 | { |
5370 | int ret; | |
996b65c8 | 5371 | gid_t gid; |
fac6795d | 5372 | |
e6142f2e | 5373 | gid = utils_get_group_id(config.tracing_group_name.value); |
fac6795d | 5374 | |
d6f42150 | 5375 | /* Set lttng run dir */ |
be040666 | 5376 | ret = chown(rundir, 0, gid); |
d6f42150 | 5377 | if (ret < 0) { |
be040666 | 5378 | ERR("Unable to set group on %s", rundir); |
76d7553f | 5379 | PERROR("chown"); |
d6f42150 DG |
5380 | } |
5381 | ||
6c71277b MD |
5382 | /* |
5383 | * Ensure all applications and tracing group can search the run | |
5384 | * dir. Allow everyone to read the directory, since it does not | |
5385 | * buy us anything to hide its content. | |
5386 | */ | |
5387 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
5388 | if (ret < 0) { |
5389 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5390 | PERROR("chmod"); |
d1613cf5 JN |
5391 | } |
5392 | ||
d6f42150 | 5393 | /* lttng client socket path */ |
e6142f2e | 5394 | ret = chown(config.client_unix_sock_path.value, 0, gid); |
fac6795d | 5395 | if (ret < 0) { |
e6142f2e | 5396 | ERR("Unable to set group on %s", config.client_unix_sock_path.value); |
76d7553f | 5397 | PERROR("chown"); |
d6f42150 DG |
5398 | } |
5399 | ||
3bd1e081 | 5400 | /* kconsumer error socket path */ |
6c71277b | 5401 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 5402 | if (ret < 0) { |
3bd1e081 | 5403 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5404 | PERROR("chown"); |
3bd1e081 MD |
5405 | } |
5406 | ||
7753dea8 | 5407 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 5408 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
5409 | if (ret < 0) { |
5410 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5411 | PERROR("chown"); |
7753dea8 MD |
5412 | } |
5413 | ||
5414 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 5415 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 5416 | if (ret < 0) { |
7753dea8 | 5417 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5418 | PERROR("chown"); |
fac6795d DG |
5419 | } |
5420 | ||
d6f42150 | 5421 | DBG("All permissions are set"); |
e07ae692 | 5422 | |
fac6795d DG |
5423 | return ret; |
5424 | } | |
5425 | ||
d6f42150 | 5426 | /* |
d063d709 | 5427 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5428 | */ |
e6142f2e | 5429 | static int create_lttng_rundir(void) |
d6f42150 DG |
5430 | { |
5431 | int ret; | |
5432 | ||
e6142f2e | 5433 | DBG3("Creating LTTng run directory: %s", config.rundir.value); |
67e40797 | 5434 | |
e6142f2e | 5435 | ret = mkdir(config.rundir.value, S_IRWXU); |
d6f42150 | 5436 | if (ret < 0) { |
b1f11e69 | 5437 | if (errno != EEXIST) { |
e6142f2e | 5438 | ERR("Unable to create %s", config.rundir.value); |
b1f11e69 DG |
5439 | goto error; |
5440 | } else { | |
5441 | ret = 0; | |
5442 | } | |
d6f42150 DG |
5443 | } |
5444 | ||
5445 | error: | |
5446 | return ret; | |
5447 | } | |
5448 | ||
5449 | /* | |
e6142f2e | 5450 | * Setup sockets and directory needed by the consumerds' communication with the |
d063d709 | 5451 | * session daemon. |
d6f42150 | 5452 | */ |
e6142f2e | 5453 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
5454 | { |
5455 | int ret; | |
e6142f2e | 5456 | char *path = NULL; |
d6f42150 | 5457 | |
6c71277b | 5458 | switch (consumer_data->type) { |
7753dea8 | 5459 | case LTTNG_CONSUMER_KERNEL: |
e6142f2e | 5460 | path = config.kconsumerd_path.value; |
7753dea8 MD |
5461 | break; |
5462 | case LTTNG_CONSUMER64_UST: | |
e6142f2e | 5463 | path = config.consumerd64_path.value; |
7753dea8 MD |
5464 | break; |
5465 | case LTTNG_CONSUMER32_UST: | |
e6142f2e | 5466 | path = config.consumerd32_path.value; |
7753dea8 MD |
5467 | break; |
5468 | default: | |
5469 | ERR("Consumer type unknown"); | |
5470 | ret = -EINVAL; | |
5471 | goto error; | |
d6f42150 | 5472 | } |
e6142f2e | 5473 | assert(path); |
d6f42150 | 5474 | |
67e40797 DG |
5475 | DBG2("Creating consumer directory: %s", path); |
5476 | ||
6c71277b | 5477 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
e7e1ef17 JR |
5478 | if (ret < 0 && errno != EEXIST) { |
5479 | PERROR("mkdir"); | |
5480 | ERR("Failed to create %s", path); | |
5481 | goto error; | |
d6f42150 | 5482 | } |
6c71277b | 5483 | if (is_root) { |
e6142f2e | 5484 | ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value)); |
6c71277b MD |
5485 | if (ret < 0) { |
5486 | ERR("Unable to set group on %s", path); | |
5487 | PERROR("chown"); | |
5488 | goto error; | |
5489 | } | |
5490 | } | |
d6f42150 | 5491 | |
e6142f2e | 5492 | /* Create the consumerd error unix socket */ |
3bd1e081 MD |
5493 | consumer_data->err_sock = |
5494 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5495 | if (consumer_data->err_sock < 0) { | |
5496 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5497 | ret = -1; |
5498 | goto error; | |
5499 | } | |
5500 | ||
a24f05ab MD |
5501 | /* |
5502 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
5503 | * show must go on. | |
5504 | */ | |
5505 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
5506 | if (ret < 0) { | |
5507 | PERROR("utils_set_fd_cloexec"); | |
5508 | /* continue anyway */ | |
5509 | } | |
5510 | ||
d6f42150 | 5511 | /* File permission MUST be 660 */ |
3bd1e081 | 5512 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5513 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5514 | if (ret < 0) { |
3bd1e081 | 5515 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5516 | PERROR("chmod"); |
d6f42150 DG |
5517 | goto error; |
5518 | } | |
5519 | ||
5520 | error: | |
5521 | return ret; | |
5522 | } | |
5523 | ||
fac6795d | 5524 | /* |
d063d709 | 5525 | * Signal handler for the daemon |
cf3af59e | 5526 | * |
54d01ffb DG |
5527 | * Simply stop all worker threads, leaving main() return gracefully after |
5528 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5529 | */ |
5530 | static void sighandler(int sig) | |
5531 | { | |
5532 | switch (sig) { | |
cf3af59e | 5533 | case SIGINT: |
af87c45a | 5534 | DBG("SIGINT caught"); |
cf3af59e MD |
5535 | stop_threads(); |
5536 | break; | |
5537 | case SIGTERM: | |
af87c45a | 5538 | DBG("SIGTERM caught"); |
cf3af59e MD |
5539 | stop_threads(); |
5540 | break; | |
0bb7724a DG |
5541 | case SIGUSR1: |
5542 | CMM_STORE_SHARED(recv_child_signal, 1); | |
5543 | break; | |
cf3af59e MD |
5544 | default: |
5545 | break; | |
fac6795d | 5546 | } |
fac6795d DG |
5547 | } |
5548 | ||
5549 | /* | |
d063d709 | 5550 | * Setup signal handler for : |
1d4b027a | 5551 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5552 | */ |
1d4b027a | 5553 | static int set_signal_handler(void) |
fac6795d | 5554 | { |
1d4b027a DG |
5555 | int ret = 0; |
5556 | struct sigaction sa; | |
5557 | sigset_t sigset; | |
fac6795d | 5558 | |
1d4b027a | 5559 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5560 | PERROR("sigemptyset"); |
1d4b027a DG |
5561 | return ret; |
5562 | } | |
d6f42150 | 5563 | |
1d4b027a DG |
5564 | sa.sa_mask = sigset; |
5565 | sa.sa_flags = 0; | |
0072e5e2 MD |
5566 | |
5567 | sa.sa_handler = sighandler; | |
1d4b027a | 5568 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
76d7553f | 5569 | PERROR("sigaction"); |
1d4b027a | 5570 | return ret; |
d6f42150 DG |
5571 | } |
5572 | ||
1d4b027a | 5573 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5574 | PERROR("sigaction"); |
1d4b027a | 5575 | return ret; |
d6f42150 | 5576 | } |
aaf26714 | 5577 | |
0072e5e2 | 5578 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
76d7553f | 5579 | PERROR("sigaction"); |
1d4b027a | 5580 | return ret; |
8c0faa1d DG |
5581 | } |
5582 | ||
0072e5e2 MD |
5583 | sa.sa_handler = SIG_IGN; |
5584 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
0bb7724a DG |
5585 | PERROR("sigaction"); |
5586 | return ret; | |
5587 | } | |
5588 | ||
5589 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
5590 | |
5591 | return ret; | |
fac6795d DG |
5592 | } |
5593 | ||
f3ed775e | 5594 | /* |
d063d709 | 5595 | * Set open files limit to unlimited. This daemon can open a large number of |
514bb9f0 | 5596 | * file descriptors in order to consume multiple kernel traces. |
f3ed775e DG |
5597 | */ |
5598 | static void set_ulimit(void) | |
5599 | { | |
5600 | int ret; | |
5601 | struct rlimit lim; | |
5602 | ||
514bb9f0 | 5603 | /* The kernel does not allow an infinite limit for open files */ |
f3ed775e DG |
5604 | lim.rlim_cur = 65535; |
5605 | lim.rlim_max = 65535; | |
5606 | ||
5607 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5608 | if (ret < 0) { | |
76d7553f | 5609 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5610 | } |
5611 | } | |
5612 | ||
4a15001e | 5613 | static int write_pidfile(void) |
35f90c40 | 5614 | { |
e6142f2e | 5615 | return utils_create_pid_file(getpid(), config.pid_file_path.value); |
35f90c40 DG |
5616 | } |
5617 | ||
e6142f2e JG |
5618 | static int set_clock_plugin_env(void) |
5619 | { | |
5620 | int ret = 0; | |
5621 | char *env_value = NULL; | |
cd9290dd | 5622 | |
e6142f2e JG |
5623 | if (!config.lttng_ust_clock_plugin.value) { |
5624 | goto end; | |
5625 | } | |
5626 | ||
5627 | ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", | |
5628 | config.lttng_ust_clock_plugin.value); | |
cd9290dd | 5629 | if (ret < 0) { |
e6142f2e JG |
5630 | PERROR("asprintf"); |
5631 | goto end; | |
cd9290dd DG |
5632 | } |
5633 | ||
e6142f2e JG |
5634 | ret = putenv(env_value); |
5635 | if (ret) { | |
5636 | free(env_value); | |
5637 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); | |
5638 | goto end; | |
5639 | } | |
cd9290dd | 5640 | |
e6142f2e JG |
5641 | DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"", |
5642 | config.lttng_ust_clock_plugin.value); | |
5643 | end: | |
4a15001e | 5644 | return ret; |
ef367a93 JG |
5645 | } |
5646 | ||
fac6795d DG |
5647 | /* |
5648 | * main | |
5649 | */ | |
5650 | int main(int argc, char **argv) | |
5651 | { | |
4a15001e | 5652 | int ret = 0, retval = 0; |
fac6795d | 5653 | void *status; |
e6142f2e | 5654 | const char *env_app_timeout; |
b3530820 JG |
5655 | struct lttng_pipe *ust32_channel_monitor_pipe = NULL, |
5656 | *ust64_channel_monitor_pipe = NULL, | |
5657 | *kernel_channel_monitor_pipe = NULL; | |
99611076 JG |
5658 | bool notification_thread_launched = false; |
5659 | bool rotation_thread_launched = false; | |
5660 | bool timer_thread_launched = false; | |
d086f507 JD |
5661 | struct timer_thread_parameters timer_thread_ctx; |
5662 | /* Queue of rotation jobs populated by the sessiond-timer. */ | |
5663 | struct rotation_thread_timer_queue *rotation_timer_queue = NULL; | |
90936dcf | 5664 | sem_t notification_thread_ready; |
fac6795d | 5665 | |
335a95b7 MD |
5666 | init_kernel_workarounds(); |
5667 | ||
f6a9efaa DG |
5668 | rcu_register_thread(); |
5669 | ||
4a15001e MD |
5670 | if (set_signal_handler()) { |
5671 | retval = -1; | |
5672 | goto exit_set_signal_handler; | |
0bb7724a DG |
5673 | } |
5674 | ||
92816cc3 | 5675 | if (timer_signal_init()) { |
d086f507 JD |
5676 | retval = -1; |
5677 | goto exit_set_signal_handler; | |
5678 | } | |
5679 | ||
12744796 DG |
5680 | page_size = sysconf(_SC_PAGESIZE); |
5681 | if (page_size < 0) { | |
5682 | PERROR("sysconf _SC_PAGESIZE"); | |
5683 | page_size = LONG_MAX; | |
5684 | WARN("Fallback page size to %ld", page_size); | |
5685 | } | |
5686 | ||
e6142f2e JG |
5687 | ret = sessiond_config_init(&config); |
5688 | if (ret) { | |
5689 | retval = -1; | |
5690 | goto exit_set_signal_handler; | |
5691 | } | |
5692 | ||
2788b494 JR |
5693 | /* |
5694 | * Init config from environment variables. | |
5695 | * Command line option override env configuration per-doc. Do env first. | |
5696 | */ | |
5697 | sessiond_config_apply_env_config(&config); | |
5698 | ||
4a15001e MD |
5699 | /* |
5700 | * Parse arguments and load the daemon configuration file. | |
5701 | * | |
5702 | * We have an exit_options exit path to free memory reserved by | |
5703 | * set_options. This is needed because the rest of sessiond_cleanup() | |
5704 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which | |
5705 | * depends on set_options. | |
5706 | */ | |
fac6795d | 5707 | progname = argv[0]; |
4a15001e MD |
5708 | if (set_options(argc, argv)) { |
5709 | retval = -1; | |
5710 | goto exit_options; | |
fac6795d DG |
5711 | } |
5712 | ||
e6142f2e JG |
5713 | /* |
5714 | * Resolve all paths received as arguments, configuration option, or | |
5715 | * through environment variable as absolute paths. This is necessary | |
5716 | * since daemonizing causes the sessiond's current working directory | |
5717 | * to '/'. | |
5718 | */ | |
5719 | ret = sessiond_config_resolve_paths(&config); | |
5720 | if (ret) { | |
5721 | goto exit_options; | |
5722 | } | |
5723 | ||
5724 | /* Apply config. */ | |
5725 | lttng_opt_verbose = config.verbose; | |
5726 | lttng_opt_quiet = config.quiet; | |
5727 | kconsumer_data.err_unix_sock_path = | |
5728 | config.kconsumerd_err_unix_sock_path.value; | |
5729 | kconsumer_data.cmd_unix_sock_path = | |
5730 | config.kconsumerd_cmd_unix_sock_path.value; | |
5731 | ustconsumer32_data.err_unix_sock_path = | |
5732 | config.consumerd32_err_unix_sock_path.value; | |
5733 | ustconsumer32_data.cmd_unix_sock_path = | |
5734 | config.consumerd32_cmd_unix_sock_path.value; | |
5735 | ustconsumer64_data.err_unix_sock_path = | |
5736 | config.consumerd64_err_unix_sock_path.value; | |
5737 | ustconsumer64_data.cmd_unix_sock_path = | |
5738 | config.consumerd64_cmd_unix_sock_path.value; | |
5739 | set_clock_plugin_env(); | |
5740 | ||
5741 | sessiond_config_log(&config); | |
5742 | ||
f472090a JG |
5743 | if (create_lttng_rundir()) { |
5744 | retval = -1; | |
5745 | goto exit_options; | |
5746 | } | |
5747 | ||
5748 | /* Abort launch if a session daemon is already running. */ | |
5749 | if (check_existing_daemon()) { | |
5750 | ERR("A session daemon is already running."); | |
5751 | retval = -1; | |
5752 | goto exit_options; | |
5753 | } | |
5754 | ||
fac6795d | 5755 | /* Daemonize */ |
e6142f2e | 5756 | if (config.daemonize || config.background) { |
ceed52b5 MD |
5757 | int i; |
5758 | ||
72dd7491 | 5759 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
e6142f2e | 5760 | !config.background); |
53094c05 | 5761 | if (ret < 0) { |
4a15001e MD |
5762 | retval = -1; |
5763 | goto exit_options; | |
53094c05 | 5764 | } |
0bb7724a | 5765 | |
ceed52b5 | 5766 | /* |
0bb7724a | 5767 | * We are in the child. Make sure all other file descriptors are |
4a15001e | 5768 | * closed, in case we are called with more opened file |
f472090a | 5769 | * descriptors than the standard ones and the lock file. |
ceed52b5 MD |
5770 | */ |
5771 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
f472090a JG |
5772 | if (i == lockfile_fd) { |
5773 | continue; | |
5774 | } | |
ceed52b5 MD |
5775 | (void) close(i); |
5776 | } | |
5777 | } | |
5778 | ||
7567352f MD |
5779 | if (run_as_create_worker(argv[0]) < 0) { |
5780 | goto exit_create_run_as_worker_cleanup; | |
5781 | } | |
5782 | ||
4a15001e MD |
5783 | /* |
5784 | * Starting from here, we can create threads. This needs to be after | |
5785 | * lttng_daemonize due to RCU. | |
5786 | */ | |
5787 | ||
5788 | /* | |
5789 | * Initialize the health check subsystem. This call should set the | |
5790 | * appropriate time values. | |
5791 | */ | |
5792 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); | |
5793 | if (!health_sessiond) { | |
5794 | PERROR("health_app_create error"); | |
5795 | retval = -1; | |
5796 | goto exit_health_sessiond_cleanup; | |
5797 | } | |
5798 | ||
4a15001e | 5799 | /* Create thread to clean up RCU hash tables */ |
5e97de00 | 5800 | if (init_ht_cleanup_thread(&ht_cleanup_thread)) { |
4a15001e MD |
5801 | retval = -1; |
5802 | goto exit_ht_cleanup; | |
5803 | } | |
5804 | ||
ceed52b5 | 5805 | /* Create thread quit pipe */ |
a7333da7 | 5806 | if (sessiond_init_thread_quit_pipe()) { |
4a15001e MD |
5807 | retval = -1; |
5808 | goto exit_init_data; | |
fac6795d DG |
5809 | } |
5810 | ||
5811 | /* Check if daemon is UID = 0 */ | |
5812 | is_root = !getuid(); | |
fac6795d | 5813 | if (is_root) { |
67e40797 | 5814 | /* Create global run dir with root access */ |
67e40797 | 5815 | |
b3530820 JG |
5816 | kernel_channel_monitor_pipe = lttng_pipe_open(0); |
5817 | if (!kernel_channel_monitor_pipe) { | |
5818 | ERR("Failed to create kernel consumer channel monitor pipe"); | |
5819 | retval = -1; | |
5820 | goto exit_init_data; | |
5821 | } | |
5822 | kconsumer_data.channel_monitor_pipe = | |
5823 | lttng_pipe_release_writefd( | |
5824 | kernel_channel_monitor_pipe); | |
5825 | if (kconsumer_data.channel_monitor_pipe < 0) { | |
5826 | retval = -1; | |
5827 | goto exit_init_data; | |
5828 | } | |
fac6795d DG |
5829 | } |
5830 | ||
5c827ce0 DG |
5831 | /* Set consumer initial state */ |
5832 | kernel_consumerd_state = CONSUMER_STOPPED; | |
5833 | ust_consumerd_state = CONSUMER_STOPPED; | |
5834 | ||
b3530820 JG |
5835 | ust32_channel_monitor_pipe = lttng_pipe_open(0); |
5836 | if (!ust32_channel_monitor_pipe) { | |
5837 | ERR("Failed to create 32-bit user space consumer channel monitor pipe"); | |
5838 | retval = -1; | |
5839 | goto exit_init_data; | |
5840 | } | |
5841 | ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
5842 | ust32_channel_monitor_pipe); | |
5843 | if (ustconsumer32_data.channel_monitor_pipe < 0) { | |
5844 | retval = -1; | |
5845 | goto exit_init_data; | |
5846 | } | |
62c43103 | 5847 | |
d086f507 | 5848 | /* |
92816cc3 JG |
5849 | * The rotation_thread_timer_queue structure is shared between the |
5850 | * sessiond timer thread and the rotation thread. The main thread keeps | |
5851 | * its ownership and destroys it when both threads have been joined. | |
d086f507 | 5852 | */ |
92816cc3 | 5853 | rotation_timer_queue = rotation_thread_timer_queue_create(); |
d086f507 JD |
5854 | if (!rotation_timer_queue) { |
5855 | retval = -1; | |
5856 | goto exit_init_data; | |
5857 | } | |
92816cc3 | 5858 | timer_thread_ctx.rotation_thread_job_queue = rotation_timer_queue; |
67e40797 | 5859 | |
b3530820 JG |
5860 | ust64_channel_monitor_pipe = lttng_pipe_open(0); |
5861 | if (!ust64_channel_monitor_pipe) { | |
5862 | ERR("Failed to create 64-bit user space consumer channel monitor pipe"); | |
5863 | retval = -1; | |
5864 | goto exit_init_data; | |
5865 | } | |
5866 | ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
5867 | ust64_channel_monitor_pipe); | |
5868 | if (ustconsumer64_data.channel_monitor_pipe < 0) { | |
5869 | retval = -1; | |
5870 | goto exit_init_data; | |
5871 | } | |
847177cd | 5872 | |
1427f9b2 DG |
5873 | /* |
5874 | * Init UST app hash table. Alloc hash table before this point since | |
5875 | * cleanup() can get called after that point. | |
5876 | */ | |
4a15001e | 5877 | if (ust_app_ht_alloc()) { |
ddbeb0f6 | 5878 | ERR("Failed to allocate UST app hash table"); |
4a15001e MD |
5879 | retval = -1; |
5880 | goto exit_init_data; | |
5881 | } | |
1427f9b2 | 5882 | |
6a4e4039 JG |
5883 | /* |
5884 | * Initialize agent app hash table. We allocate the hash table here | |
5885 | * since cleanup() can get called after this point. | |
5886 | */ | |
5887 | if (agent_app_ht_alloc()) { | |
5888 | ERR("Failed to allocate Agent app hash table"); | |
4a15001e MD |
5889 | retval = -1; |
5890 | goto exit_init_data; | |
f20baf8e DG |
5891 | } |
5892 | ||
a88df331 DG |
5893 | /* |
5894 | * These actions must be executed as root. We do that *after* setting up | |
5895 | * the sockets path because we MUST make the check for another daemon using | |
5896 | * those paths *before* trying to set the kernel consumer sockets and init | |
5897 | * kernel tracer. | |
5898 | */ | |
5899 | if (is_root) { | |
e6142f2e | 5900 | if (set_consumer_sockets(&kconsumer_data)) { |
4a15001e MD |
5901 | retval = -1; |
5902 | goto exit_init_data; | |
7753dea8 MD |
5903 | } |
5904 | ||
a88df331 | 5905 | /* Setup kernel tracer */ |
e6142f2e | 5906 | if (!config.no_kernel) { |
4fba7219 | 5907 | init_kernel_tracer(); |
89588270 DG |
5908 | if (kernel_tracer_fd >= 0) { |
5909 | ret = syscall_init_table(); | |
5910 | if (ret < 0) { | |
4a15001e MD |
5911 | ERR("Unable to populate syscall table. " |
5912 | "Syscall tracing won't work " | |
5913 | "for this session daemon."); | |
89588270 | 5914 | } |
834978fd | 5915 | } |
4fba7219 | 5916 | } |
a88df331 DG |
5917 | |
5918 | /* Set ulimit for open files */ | |
5919 | set_ulimit(); | |
fac6795d | 5920 | } |
4063050c MD |
5921 | /* init lttng_fd tracking must be done after set_ulimit. */ |
5922 | lttng_fd_init(); | |
fac6795d | 5923 | |
e6142f2e | 5924 | if (set_consumer_sockets(&ustconsumer64_data)) { |
4a15001e MD |
5925 | retval = -1; |
5926 | goto exit_init_data; | |
67e40797 DG |
5927 | } |
5928 | ||
e6142f2e | 5929 | if (set_consumer_sockets(&ustconsumer32_data)) { |
4a15001e MD |
5930 | retval = -1; |
5931 | goto exit_init_data; | |
67e40797 DG |
5932 | } |
5933 | ||
d6f42150 | 5934 | /* Setup the needed unix socket */ |
4a15001e MD |
5935 | if (init_daemon_socket()) { |
5936 | retval = -1; | |
5937 | goto exit_init_data; | |
fac6795d DG |
5938 | } |
5939 | ||
5940 | /* Set credentials to socket */ | |
e6142f2e | 5941 | if (is_root && set_permissions(config.rundir.value)) { |
4a15001e MD |
5942 | retval = -1; |
5943 | goto exit_init_data; | |
fac6795d DG |
5944 | } |
5945 | ||
5b8719f5 | 5946 | /* Get parent pid if -S, --sig-parent is specified. */ |
e6142f2e | 5947 | if (config.sig_parent) { |
5b8719f5 DG |
5948 | ppid = getppid(); |
5949 | } | |
5950 | ||
7a485870 | 5951 | /* Setup the kernel pipe for waking up the kernel thread */ |
e6142f2e | 5952 | if (is_root && !config.no_kernel) { |
4a15001e MD |
5953 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
5954 | retval = -1; | |
5955 | goto exit_init_data; | |
6620da75 | 5956 | } |
7a485870 DG |
5957 | } |
5958 | ||
099e26bd | 5959 | /* Setup the thread apps communication pipe. */ |
4a15001e MD |
5960 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
5961 | retval = -1; | |
5962 | goto exit_init_data; | |
099e26bd DG |
5963 | } |
5964 | ||
d0b96690 | 5965 | /* Setup the thread apps notify communication pipe. */ |
4a15001e MD |
5966 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
5967 | retval = -1; | |
5968 | goto exit_init_data; | |
d0b96690 DG |
5969 | } |
5970 | ||
7972aab2 DG |
5971 | /* Initialize global buffer per UID and PID registry. */ |
5972 | buffer_reg_init_uid_registry(); | |
5973 | buffer_reg_init_pid_registry(); | |
5974 | ||
099e26bd | 5975 | /* Init UST command queue. */ |
8bdee6e2 | 5976 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 5977 | |
2f77fc4b | 5978 | cmd_init(); |
00e2e675 | 5979 | |
ae9e45b3 DG |
5980 | /* Check for the application socket timeout env variable. */ |
5981 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
5982 | if (env_app_timeout) { | |
e6142f2e | 5983 | config.app_socket_timeout = atoi(env_app_timeout); |
ae9e45b3 | 5984 | } else { |
e6142f2e | 5985 | config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; |
ae9e45b3 DG |
5986 | } |
5987 | ||
4a15001e MD |
5988 | ret = write_pidfile(); |
5989 | if (ret) { | |
5990 | ERR("Error in write_pidfile"); | |
5991 | retval = -1; | |
5992 | goto exit_init_data; | |
5993 | } | |
35f90c40 | 5994 | |
554831e7 MD |
5995 | /* Initialize communication library */ |
5996 | lttcomm_init(); | |
4a15001e | 5997 | /* Initialize TCP timeout values */ |
d831c249 | 5998 | lttcomm_inet_init(); |
554831e7 | 5999 | |
ef367a93 | 6000 | if (load_session_init_data(&load_info) < 0) { |
4a15001e MD |
6001 | retval = -1; |
6002 | goto exit_init_data; | |
ef367a93 | 6003 | } |
e6142f2e | 6004 | load_info->path = config.load_session_path.value; |
ef367a93 | 6005 | |
12b4fb37 | 6006 | /* Create health-check thread. */ |
1a1a34b4 | 6007 | ret = pthread_create(&health_thread, default_pthread_attr(), |
44a5e5eb | 6008 | thread_manage_health, (void *) NULL); |
4a15001e MD |
6009 | if (ret) { |
6010 | errno = ret; | |
44a5e5eb | 6011 | PERROR("pthread_create health"); |
4a15001e | 6012 | retval = -1; |
44a5e5eb DG |
6013 | goto exit_health; |
6014 | } | |
6015 | ||
90936dcf JD |
6016 | /* |
6017 | * The rotation thread needs the notification thread to be ready before | |
6018 | * creating the rotate_notification_channel, so we use this semaphore as | |
6019 | * a rendez-vous point. | |
6020 | */ | |
6021 | sem_init(¬ification_thread_ready, 0, 0); | |
6022 | ||
b3530820 JG |
6023 | /* notification_thread_data acquires the pipes' read side. */ |
6024 | notification_thread_handle = notification_thread_handle_create( | |
6025 | ust32_channel_monitor_pipe, | |
6026 | ust64_channel_monitor_pipe, | |
90936dcf JD |
6027 | kernel_channel_monitor_pipe, |
6028 | ¬ification_thread_ready); | |
b3530820 JG |
6029 | if (!notification_thread_handle) { |
6030 | retval = -1; | |
6031 | ERR("Failed to create notification thread shared data"); | |
6032 | stop_threads(); | |
6033 | goto exit_notification; | |
6034 | } | |
6035 | ||
6036 | /* Create notification thread. */ | |
6037 | ret = pthread_create(¬ification_thread, default_pthread_attr(), | |
6038 | thread_notification, notification_thread_handle); | |
6039 | if (ret) { | |
6040 | errno = ret; | |
6041 | PERROR("pthread_create notification"); | |
6042 | retval = -1; | |
6043 | stop_threads(); | |
6044 | goto exit_notification; | |
6045 | } | |
99611076 | 6046 | notification_thread_launched = true; |
b3530820 | 6047 | |
d086f507 JD |
6048 | /* Create timer thread. */ |
6049 | ret = pthread_create(&timer_thread, default_pthread_attr(), | |
92816cc3 | 6050 | timer_thread_func, &timer_thread_ctx); |
d086f507 JD |
6051 | if (ret) { |
6052 | errno = ret; | |
6053 | PERROR("pthread_create timer"); | |
6054 | retval = -1; | |
6055 | stop_threads(); | |
6056 | goto exit_notification; | |
6057 | } | |
99611076 | 6058 | timer_thread_launched = true; |
d086f507 | 6059 | |
db66e574 JD |
6060 | /* rotation_thread_data acquires the pipes' read side. */ |
6061 | rotation_thread_handle = rotation_thread_handle_create( | |
90936dcf JD |
6062 | rotation_timer_queue, |
6063 | notification_thread_handle, | |
6064 | ¬ification_thread_ready); | |
db66e574 JD |
6065 | if (!rotation_thread_handle) { |
6066 | retval = -1; | |
6067 | ERR("Failed to create rotation thread shared data"); | |
6068 | stop_threads(); | |
6069 | goto exit_rotation; | |
6070 | } | |
db66e574 JD |
6071 | |
6072 | /* Create rotation thread. */ | |
6073 | ret = pthread_create(&rotation_thread, default_pthread_attr(), | |
6074 | thread_rotation, rotation_thread_handle); | |
6075 | if (ret) { | |
6076 | errno = ret; | |
6077 | PERROR("pthread_create rotation"); | |
6078 | retval = -1; | |
6079 | stop_threads(); | |
6080 | goto exit_rotation; | |
6081 | } | |
99611076 | 6082 | rotation_thread_launched = true; |
db66e574 | 6083 | |
cf3af59e | 6084 | /* Create thread to manage the client socket */ |
1a1a34b4 | 6085 | ret = pthread_create(&client_thread, default_pthread_attr(), |
099e26bd | 6086 | thread_manage_clients, (void *) NULL); |
4a15001e MD |
6087 | if (ret) { |
6088 | errno = ret; | |
76d7553f | 6089 | PERROR("pthread_create clients"); |
4a15001e | 6090 | retval = -1; |
b3530820 | 6091 | stop_threads(); |
cf3af59e MD |
6092 | goto exit_client; |
6093 | } | |
fac6795d | 6094 | |
099e26bd | 6095 | /* Create thread to dispatch registration */ |
1a1a34b4 | 6096 | ret = pthread_create(&dispatch_thread, default_pthread_attr(), |
099e26bd | 6097 | thread_dispatch_ust_registration, (void *) NULL); |
4a15001e MD |
6098 | if (ret) { |
6099 | errno = ret; | |
76d7553f | 6100 | PERROR("pthread_create dispatch"); |
4a15001e | 6101 | retval = -1; |
b3530820 | 6102 | stop_threads(); |
099e26bd DG |
6103 | goto exit_dispatch; |
6104 | } | |
6105 | ||
6106 | /* Create thread to manage application registration. */ | |
1a1a34b4 | 6107 | ret = pthread_create(®_apps_thread, default_pthread_attr(), |
099e26bd | 6108 | thread_registration_apps, (void *) NULL); |
4a15001e MD |
6109 | if (ret) { |
6110 | errno = ret; | |
76d7553f | 6111 | PERROR("pthread_create registration"); |
4a15001e | 6112 | retval = -1; |
b3530820 | 6113 | stop_threads(); |
099e26bd DG |
6114 | goto exit_reg_apps; |
6115 | } | |
6116 | ||
cf3af59e | 6117 | /* Create thread to manage application socket */ |
1a1a34b4 | 6118 | ret = pthread_create(&apps_thread, default_pthread_attr(), |
54d01ffb | 6119 | thread_manage_apps, (void *) NULL); |
4a15001e MD |
6120 | if (ret) { |
6121 | errno = ret; | |
d0b96690 | 6122 | PERROR("pthread_create apps"); |
4a15001e | 6123 | retval = -1; |
b3530820 | 6124 | stop_threads(); |
d0b96690 DG |
6125 | goto exit_apps; |
6126 | } | |
6127 | ||
6128 | /* Create thread to manage application notify socket */ | |
1a1a34b4 | 6129 | ret = pthread_create(&apps_notify_thread, default_pthread_attr(), |
d0b96690 | 6130 | ust_thread_manage_notify, (void *) NULL); |
4a15001e MD |
6131 | if (ret) { |
6132 | errno = ret; | |
f5c32ef1 | 6133 | PERROR("pthread_create notify"); |
4a15001e | 6134 | retval = -1; |
b3530820 | 6135 | stop_threads(); |
9563b0ad | 6136 | goto exit_apps_notify; |
cf3af59e | 6137 | } |
fac6795d | 6138 | |
022d91ba | 6139 | /* Create agent registration thread. */ |
1a1a34b4 | 6140 | ret = pthread_create(&agent_reg_thread, default_pthread_attr(), |
022d91ba | 6141 | agent_thread_manage_registration, (void *) NULL); |
4a15001e MD |
6142 | if (ret) { |
6143 | errno = ret; | |
022d91ba | 6144 | PERROR("pthread_create agent"); |
4a15001e | 6145 | retval = -1; |
b3530820 | 6146 | stop_threads(); |
022d91ba | 6147 | goto exit_agent_reg; |
4d076222 DG |
6148 | } |
6149 | ||
6620da75 | 6150 | /* Don't start this thread if kernel tracing is not requested nor root */ |
e6142f2e | 6151 | if (is_root && !config.no_kernel) { |
6620da75 | 6152 | /* Create kernel thread to manage kernel event */ |
1a1a34b4 | 6153 | ret = pthread_create(&kernel_thread, default_pthread_attr(), |
6620da75 | 6154 | thread_manage_kernel, (void *) NULL); |
4a15001e MD |
6155 | if (ret) { |
6156 | errno = ret; | |
6620da75 | 6157 | PERROR("pthread_create kernel"); |
4a15001e | 6158 | retval = -1; |
b3530820 | 6159 | stop_threads(); |
6620da75 DG |
6160 | goto exit_kernel; |
6161 | } | |
ef367a93 | 6162 | } |
7a485870 | 6163 | |
4a15001e | 6164 | /* Create session loading thread. */ |
1a1a34b4 MJ |
6165 | ret = pthread_create(&load_session_thread, default_pthread_attr(), |
6166 | thread_load_session, load_info); | |
4a15001e MD |
6167 | if (ret) { |
6168 | errno = ret; | |
6169 | PERROR("pthread_create load_session_thread"); | |
6170 | retval = -1; | |
b3530820 | 6171 | stop_threads(); |
4a15001e MD |
6172 | goto exit_load_session; |
6173 | } | |
6174 | ||
6175 | /* | |
6176 | * This is where we start awaiting program completion (e.g. through | |
6177 | * signal that asks threads to teardown). | |
6178 | */ | |
6179 | ||
6180 | ret = pthread_join(load_session_thread, &status); | |
6181 | if (ret) { | |
6182 | errno = ret; | |
6183 | PERROR("pthread_join load_session_thread"); | |
6184 | retval = -1; | |
6185 | } | |
6186 | exit_load_session: | |
ef367a93 | 6187 | |
e6142f2e | 6188 | if (is_root && !config.no_kernel) { |
6620da75 | 6189 | ret = pthread_join(kernel_thread, &status); |
4a15001e MD |
6190 | if (ret) { |
6191 | errno = ret; | |
6620da75 | 6192 | PERROR("pthread_join"); |
4a15001e | 6193 | retval = -1; |
6620da75 | 6194 | } |
fac6795d | 6195 | } |
cf3af59e | 6196 | exit_kernel: |
4a15001e | 6197 | |
022d91ba | 6198 | ret = pthread_join(agent_reg_thread, &status); |
4a15001e MD |
6199 | if (ret) { |
6200 | errno = ret; | |
022d91ba | 6201 | PERROR("pthread_join agent"); |
4a15001e | 6202 | retval = -1; |
4d076222 | 6203 | } |
022d91ba | 6204 | exit_agent_reg: |
4a15001e | 6205 | |
9563b0ad | 6206 | ret = pthread_join(apps_notify_thread, &status); |
4a15001e MD |
6207 | if (ret) { |
6208 | errno = ret; | |
9563b0ad | 6209 | PERROR("pthread_join apps notify"); |
4a15001e | 6210 | retval = -1; |
9563b0ad | 6211 | } |
9563b0ad | 6212 | exit_apps_notify: |
4a15001e | 6213 | |
cf3af59e | 6214 | ret = pthread_join(apps_thread, &status); |
4a15001e MD |
6215 | if (ret) { |
6216 | errno = ret; | |
9563b0ad | 6217 | PERROR("pthread_join apps"); |
4a15001e | 6218 | retval = -1; |
cf3af59e | 6219 | } |
cf3af59e | 6220 | exit_apps: |
4a15001e | 6221 | |
099e26bd | 6222 | ret = pthread_join(reg_apps_thread, &status); |
4a15001e MD |
6223 | if (ret) { |
6224 | errno = ret; | |
76d7553f | 6225 | PERROR("pthread_join"); |
4a15001e | 6226 | retval = -1; |
099e26bd | 6227 | } |
099e26bd | 6228 | exit_reg_apps: |
4a15001e | 6229 | |
772b8f4d MD |
6230 | /* |
6231 | * Join dispatch thread after joining reg_apps_thread to ensure | |
6232 | * we don't leak applications in the queue. | |
6233 | */ | |
099e26bd | 6234 | ret = pthread_join(dispatch_thread, &status); |
4a15001e MD |
6235 | if (ret) { |
6236 | errno = ret; | |
76d7553f | 6237 | PERROR("pthread_join"); |
4a15001e | 6238 | retval = -1; |
099e26bd | 6239 | } |
099e26bd | 6240 | exit_dispatch: |
4a15001e | 6241 | |
cf3af59e | 6242 | ret = pthread_join(client_thread, &status); |
4a15001e MD |
6243 | if (ret) { |
6244 | errno = ret; | |
76d7553f | 6245 | PERROR("pthread_join"); |
4a15001e | 6246 | retval = -1; |
cf3af59e | 6247 | } |
a88df331 | 6248 | |
b3530820 | 6249 | exit_client: |
db66e574 | 6250 | exit_rotation: |
b3530820 | 6251 | exit_notification: |
90936dcf | 6252 | sem_destroy(¬ification_thread_ready); |
4a15001e MD |
6253 | ret = pthread_join(health_thread, &status); |
6254 | if (ret) { | |
6255 | errno = ret; | |
6256 | PERROR("pthread_join health thread"); | |
6257 | retval = -1; | |
06f525de DG |
6258 | } |
6259 | ||
b3530820 | 6260 | exit_health: |
4a15001e | 6261 | exit_init_data: |
4d62fbf8 MD |
6262 | /* |
6263 | * Wait for all pending call_rcu work to complete before tearing | |
6264 | * down data structures. call_rcu worker may be trying to | |
6265 | * perform lookups in those structures. | |
6266 | */ | |
6267 | rcu_barrier(); | |
4a15001e MD |
6268 | /* |
6269 | * sessiond_cleanup() is called when no other thread is running, except | |
6270 | * the ht_cleanup thread, which is needed to destroy the hash tables. | |
6271 | */ | |
6272 | rcu_thread_online(); | |
6273 | sessiond_cleanup(); | |
06f525de | 6274 | |
c4d5de9d JG |
6275 | /* |
6276 | * Ensure all prior call_rcu are done. call_rcu callbacks may push | |
6277 | * hash tables to the ht_cleanup thread. Therefore, we ensure that | |
6278 | * the queue is empty before shutting down the clean-up thread. | |
6279 | */ | |
6280 | rcu_barrier(); | |
6281 | ||
b3530820 JG |
6282 | /* |
6283 | * The teardown of the notification system is performed after the | |
6284 | * session daemon's teardown in order to allow it to be notified | |
6285 | * of the active session and channels at the moment of the teardown. | |
6286 | */ | |
6287 | if (notification_thread_handle) { | |
99611076 | 6288 | if (notification_thread_launched) { |
6be1a386 JG |
6289 | notification_thread_command_quit( |
6290 | notification_thread_handle); | |
6291 | ret = pthread_join(notification_thread, &status); | |
6292 | if (ret) { | |
6293 | errno = ret; | |
6294 | PERROR("pthread_join notification thread"); | |
6295 | retval = -1; | |
6296 | } | |
3dec304b | 6297 | } |
6be1a386 | 6298 | notification_thread_handle_destroy(notification_thread_handle); |
b3530820 JG |
6299 | } |
6300 | ||
db66e574 | 6301 | if (rotation_thread_handle) { |
99611076 | 6302 | if (rotation_thread_launched) { |
db66e574 JD |
6303 | ret = pthread_join(rotation_thread, &status); |
6304 | if (ret) { | |
6305 | errno = ret; | |
6306 | PERROR("pthread_join rotation thread"); | |
6307 | retval = -1; | |
6308 | } | |
6309 | } | |
6310 | rotation_thread_handle_destroy(rotation_thread_handle); | |
6311 | } | |
6312 | ||
99611076 | 6313 | if (timer_thread_launched) { |
92816cc3 | 6314 | timer_exit(); |
d086f507 JD |
6315 | ret = pthread_join(timer_thread, &status); |
6316 | if (ret) { | |
6317 | errno = ret; | |
6318 | PERROR("pthread_join timer thread"); | |
6319 | retval = -1; | |
6320 | } | |
6321 | } | |
6322 | ||
6323 | /* | |
6324 | * After the rotation and timer thread have quit, we can safely destroy | |
6325 | * the rotation_timer_queue. | |
6326 | */ | |
92816cc3 | 6327 | rotation_thread_timer_queue_destroy(rotation_timer_queue); |
d086f507 | 6328 | |
b3530820 JG |
6329 | rcu_thread_offline(); |
6330 | rcu_unregister_thread(); | |
6331 | ||
5e97de00 | 6332 | ret = fini_ht_cleanup_thread(&ht_cleanup_thread); |
4a15001e | 6333 | if (ret) { |
4a15001e | 6334 | retval = -1; |
0b2dc8df | 6335 | } |
b3530820 JG |
6336 | lttng_pipe_destroy(ust32_channel_monitor_pipe); |
6337 | lttng_pipe_destroy(ust64_channel_monitor_pipe); | |
6338 | lttng_pipe_destroy(kernel_channel_monitor_pipe); | |
0b2dc8df | 6339 | exit_ht_cleanup: |
4a15001e | 6340 | |
4a15001e MD |
6341 | health_app_destroy(health_sessiond); |
6342 | exit_health_sessiond_cleanup: | |
7567352f | 6343 | exit_create_run_as_worker_cleanup: |
4a15001e MD |
6344 | |
6345 | exit_options: | |
f472090a | 6346 | sessiond_cleanup_lock_file(); |
4a15001e MD |
6347 | sessiond_cleanup_options(); |
6348 | ||
6349 | exit_set_signal_handler: | |
6350 | if (!retval) { | |
cf3af59e | 6351 | exit(EXIT_SUCCESS); |
4a15001e MD |
6352 | } else { |
6353 | exit(EXIT_FAILURE); | |
67e40797 | 6354 | } |
fac6795d | 6355 | } |