Commit | Line | Data |
---|---|---|
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" |
a3707772 | 85 | #include "thread.h" |
ebaeda94 | 86 | |
4fc83d94 PP |
87 | static const char *help_msg = |
88 | #ifdef LTTNG_EMBED_HELP | |
89 | #include <lttng-sessiond.8.h> | |
90 | #else | |
91 | NULL | |
92 | #endif | |
93 | ; | |
94 | ||
fac6795d | 95 | const char *progname; |
c9cb3e7d | 96 | static int lockfile_fd = -1; |
3bd1e081 | 97 | |
0bb7724a DG |
98 | /* Set to 1 when a SIGUSR1 signal is received. */ |
99 | static int recv_child_signal; | |
100 | ||
88076e89 JD |
101 | static struct lttng_kernel_tracer_version kernel_tracer_version; |
102 | static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version; | |
103 | ||
a23ec3a7 DG |
104 | /* |
105 | * Consumer daemon specific control data. Every value not initialized here is | |
106 | * set to 0 by the static definition. | |
107 | */ | |
3bd1e081 MD |
108 | static struct consumer_data kconsumer_data = { |
109 | .type = LTTNG_CONSUMER_KERNEL, | |
03550b58 MD |
110 | .err_sock = -1, |
111 | .cmd_sock = -1, | |
b3530820 | 112 | .channel_monitor_pipe = -1, |
173af62f DG |
113 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
114 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
115 | .cond = PTHREAD_COND_INITIALIZER, |
116 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 117 | }; |
7753dea8 MD |
118 | static struct consumer_data ustconsumer64_data = { |
119 | .type = LTTNG_CONSUMER64_UST, | |
03550b58 MD |
120 | .err_sock = -1, |
121 | .cmd_sock = -1, | |
b3530820 | 122 | .channel_monitor_pipe = -1, |
173af62f DG |
123 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
124 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
125 | .cond = PTHREAD_COND_INITIALIZER, |
126 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
127 | }; |
128 | static struct consumer_data ustconsumer32_data = { | |
129 | .type = LTTNG_CONSUMER32_UST, | |
03550b58 MD |
130 | .err_sock = -1, |
131 | .cmd_sock = -1, | |
b3530820 | 132 | .channel_monitor_pipe = -1, |
173af62f DG |
133 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
134 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
135 | .cond = PTHREAD_COND_INITIALIZER, |
136 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
137 | }; |
138 | ||
26296c48 JG |
139 | /* Command line options */ |
140 | static const struct option long_options[] = { | |
0f5ea17c JG |
141 | { "client-sock", required_argument, 0, 'c' }, |
142 | { "apps-sock", required_argument, 0, 'a' }, | |
143 | { "kconsumerd-cmd-sock", required_argument, 0, '\0' }, | |
144 | { "kconsumerd-err-sock", required_argument, 0, '\0' }, | |
145 | { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' }, | |
146 | { "ustconsumerd32-err-sock", required_argument, 0, '\0' }, | |
147 | { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' }, | |
148 | { "ustconsumerd64-err-sock", required_argument, 0, '\0' }, | |
149 | { "consumerd32-path", required_argument, 0, '\0' }, | |
150 | { "consumerd32-libdir", required_argument, 0, '\0' }, | |
151 | { "consumerd64-path", required_argument, 0, '\0' }, | |
152 | { "consumerd64-libdir", required_argument, 0, '\0' }, | |
153 | { "daemonize", no_argument, 0, 'd' }, | |
154 | { "background", no_argument, 0, 'b' }, | |
155 | { "sig-parent", no_argument, 0, 'S' }, | |
156 | { "help", no_argument, 0, 'h' }, | |
157 | { "group", required_argument, 0, 'g' }, | |
158 | { "version", no_argument, 0, 'V' }, | |
159 | { "quiet", no_argument, 0, 'q' }, | |
160 | { "verbose", no_argument, 0, 'v' }, | |
161 | { "verbose-consumer", no_argument, 0, '\0' }, | |
162 | { "no-kernel", no_argument, 0, '\0' }, | |
163 | { "pidfile", required_argument, 0, 'p' }, | |
164 | { "agent-tcp-port", required_argument, 0, '\0' }, | |
165 | { "config", required_argument, 0, 'f' }, | |
166 | { "load", required_argument, 0, 'l' }, | |
167 | { "kmod-probes", required_argument, 0, '\0' }, | |
168 | { "extra-kmod-probes", required_argument, 0, '\0' }, | |
26296c48 JG |
169 | { NULL, 0, 0, 0 } |
170 | }; | |
171 | ||
172 | /* Command line options to ignore from configuration file */ | |
173 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
174 | ||
26c9d55e | 175 | /* Shared between threads */ |
099e26bd | 176 | static int dispatch_thread_exit; |
fac6795d | 177 | |
1d4b027a | 178 | /* Sockets and FDs */ |
a4b35e07 MD |
179 | static int client_sock = -1; |
180 | static int apps_sock = -1; | |
1d4b027a | 181 | |
099e26bd DG |
182 | /* |
183 | * This pipe is used to inform the thread managing application communication | |
184 | * that a command is queued and ready to be processed. | |
185 | */ | |
76d7553f | 186 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 187 | |
1d4b027a | 188 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 189 | static pthread_t apps_thread; |
d0b96690 | 190 | static pthread_t apps_notify_thread; |
099e26bd | 191 | static pthread_t reg_apps_thread; |
1d4b027a | 192 | static pthread_t client_thread; |
7a485870 | 193 | static pthread_t kernel_thread; |
099e26bd | 194 | static pthread_t dispatch_thread; |
022d91ba | 195 | static pthread_t agent_reg_thread; |
ef367a93 | 196 | static pthread_t load_session_thread; |
d086f507 | 197 | static pthread_t timer_thread; |
5eb91c98 | 198 | |
099e26bd DG |
199 | /* |
200 | * UST registration command queue. This queue is tied with a futex and uses a N | |
201 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
202 | * | |
b22c5da8 DG |
203 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
204 | * queue along with the wait/wake scheme. The thread_manage_apps receives down | |
205 | * the line new application socket and monitors it for any I/O error or clean | |
206 | * close that triggers an unregistration of the application. | |
099e26bd DG |
207 | */ |
208 | static struct ust_cmd_queue ust_cmd_queue; | |
209 | ||
2f77fc4b DG |
210 | static const char *module_proc_lttng = "/proc/lttng"; |
211 | ||
5c827ce0 DG |
212 | /* |
213 | * Consumer daemon state which is changed when spawning it, killing it or in | |
214 | * case of a fatal error. | |
215 | */ | |
216 | enum consumerd_state { | |
217 | CONSUMER_STARTED = 1, | |
218 | CONSUMER_STOPPED = 2, | |
219 | CONSUMER_ERROR = 3, | |
220 | }; | |
221 | ||
222 | /* | |
223 | * This consumer daemon state is used to validate if a client command will be | |
224 | * able to reach the consumer. If not, the client is informed. For instance, | |
225 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
226 | * error to the client. | |
227 | * | |
228 | * The following example shows a possible race condition of this scheme: | |
229 | * | |
230 | * consumer thread error happens | |
231 | * client cmd arrives | |
232 | * client cmd checks state -> still OK | |
233 | * consumer thread exit, sets error | |
234 | * client cmd try to talk to consumer | |
235 | * ... | |
236 | * | |
237 | * However, since the consumer is a different daemon, we have no way of making | |
238 | * sure the command will reach it safely even with this state flag. This is why | |
239 | * we consider that up to the state validation during command processing, the | |
240 | * command is safe. After that, we can not guarantee the correctness of the | |
241 | * client request vis-a-vis the consumer. | |
242 | */ | |
243 | static enum consumerd_state ust_consumerd_state; | |
244 | static enum consumerd_state kernel_consumerd_state; | |
245 | ||
ef367a93 | 246 | /* Load session thread information to operate. */ |
a7333da7 | 247 | static struct load_session_thread_data *load_info; |
7c1d2758 | 248 | |
97bc1426 | 249 | /* |
a7333da7 | 250 | * Section name to look for in the daemon configuration file. |
97bc1426 | 251 | */ |
a7333da7 | 252 | static const char * const config_section_name = "sessiond"; |
5e97de00 | 253 | |
a7333da7 JG |
254 | /* Am I root or not. Set to 1 if the daemon is running as root */ |
255 | static int is_root; | |
5eb91c98 | 256 | |
099e26bd DG |
257 | /* |
258 | * Stop all threads by closing the thread quit pipe. | |
259 | */ | |
cf3af59e MD |
260 | static void stop_threads(void) |
261 | { | |
5eb91c98 DG |
262 | int ret; |
263 | ||
cf3af59e MD |
264 | /* Stopping all threads */ |
265 | DBG("Terminating all threads"); | |
a7333da7 | 266 | ret = sessiond_notify_quit_pipe(); |
5eb91c98 DG |
267 | if (ret < 0) { |
268 | ERR("write error on thread quit pipe"); | |
269 | } | |
270 | ||
099e26bd | 271 | /* Dispatch thread */ |
26c9d55e | 272 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 273 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
274 | } |
275 | ||
e975f9f8 DG |
276 | /* |
277 | * Close every consumer sockets. | |
278 | */ | |
279 | static void close_consumer_sockets(void) | |
280 | { | |
281 | int ret; | |
282 | ||
283 | if (kconsumer_data.err_sock >= 0) { | |
284 | ret = close(kconsumer_data.err_sock); | |
285 | if (ret < 0) { | |
286 | PERROR("kernel consumer err_sock close"); | |
287 | } | |
288 | } | |
289 | if (ustconsumer32_data.err_sock >= 0) { | |
290 | ret = close(ustconsumer32_data.err_sock); | |
291 | if (ret < 0) { | |
a76cbd9f | 292 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
293 | } |
294 | } | |
295 | if (ustconsumer64_data.err_sock >= 0) { | |
296 | ret = close(ustconsumer64_data.err_sock); | |
297 | if (ret < 0) { | |
a76cbd9f | 298 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
299 | } |
300 | } | |
301 | if (kconsumer_data.cmd_sock >= 0) { | |
302 | ret = close(kconsumer_data.cmd_sock); | |
303 | if (ret < 0) { | |
304 | PERROR("kernel consumer cmd_sock close"); | |
305 | } | |
306 | } | |
307 | if (ustconsumer32_data.cmd_sock >= 0) { | |
308 | ret = close(ustconsumer32_data.cmd_sock); | |
309 | if (ret < 0) { | |
a76cbd9f | 310 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
311 | } |
312 | } | |
313 | if (ustconsumer64_data.cmd_sock >= 0) { | |
314 | ret = close(ustconsumer64_data.cmd_sock); | |
315 | if (ret < 0) { | |
a76cbd9f | 316 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
317 | } |
318 | } | |
b3530820 JG |
319 | if (kconsumer_data.channel_monitor_pipe >= 0) { |
320 | ret = close(kconsumer_data.channel_monitor_pipe); | |
321 | if (ret < 0) { | |
322 | PERROR("kernel consumer channel monitor pipe close"); | |
323 | } | |
324 | } | |
325 | if (ustconsumer32_data.channel_monitor_pipe >= 0) { | |
326 | ret = close(ustconsumer32_data.channel_monitor_pipe); | |
327 | if (ret < 0) { | |
328 | PERROR("UST consumerd32 channel monitor pipe close"); | |
329 | } | |
330 | } | |
331 | if (ustconsumer64_data.channel_monitor_pipe >= 0) { | |
332 | ret = close(ustconsumer64_data.channel_monitor_pipe); | |
333 | if (ret < 0) { | |
334 | PERROR("UST consumerd64 channel monitor pipe close"); | |
335 | } | |
336 | } | |
e975f9f8 DG |
337 | } |
338 | ||
4e4714cb JR |
339 | /* |
340 | * Wait on consumer process termination. | |
341 | * | |
342 | * Need to be called with the consumer data lock held or from a context | |
343 | * ensuring no concurrent access to data (e.g: cleanup). | |
344 | */ | |
345 | static void wait_consumer(struct consumer_data *consumer_data) | |
346 | { | |
347 | pid_t ret; | |
348 | int status; | |
349 | ||
350 | if (consumer_data->pid <= 0) { | |
351 | return; | |
352 | } | |
353 | ||
354 | DBG("Waiting for complete teardown of consumerd (PID: %d)", | |
355 | consumer_data->pid); | |
356 | ret = waitpid(consumer_data->pid, &status, 0); | |
357 | if (ret == -1) { | |
358 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) | |
1640c24c | 359 | } else if (!WIFEXITED(status)) { |
4e4714cb JR |
360 | ERR("consumerd termination with error: %d", |
361 | WEXITSTATUS(ret)); | |
362 | } | |
363 | consumer_data->pid = 0; | |
364 | } | |
365 | ||
fac6795d | 366 | /* |
4a15001e | 367 | * Cleanup the session daemon's data structures. |
fac6795d | 368 | */ |
4a15001e | 369 | static void sessiond_cleanup(void) |
fac6795d | 370 | { |
ef599319 | 371 | int ret; |
e32d7f27 | 372 | struct ltt_session_list *session_list = session_get_list(); |
fac6795d | 373 | |
4a15001e | 374 | DBG("Cleanup sessiond"); |
e07ae692 | 375 | |
4e449f3f MD |
376 | /* |
377 | * Close the thread quit pipe. It has already done its job, | |
378 | * since we are now called. | |
379 | */ | |
a7333da7 | 380 | sessiond_close_quit_pipe(); |
2f77fc4b | 381 | |
c9a2957d JG |
382 | ret = remove(config.pid_file_path.value); |
383 | if (ret < 0) { | |
384 | PERROR("remove pidfile %s", config.pid_file_path.value); | |
35f90c40 DG |
385 | } |
386 | ||
e6142f2e JG |
387 | DBG("Removing sessiond and consumerd content of directory %s", |
388 | config.rundir.value); | |
8c6c56c2 MD |
389 | |
390 | /* sessiond */ | |
e6142f2e JG |
391 | DBG("Removing %s", config.pid_file_path.value); |
392 | (void) unlink(config.pid_file_path.value); | |
8c6c56c2 | 393 | |
e6142f2e JG |
394 | DBG("Removing %s", config.agent_port_file_path.value); |
395 | (void) unlink(config.agent_port_file_path.value); | |
cd9290dd | 396 | |
8c6c56c2 | 397 | /* kconsumerd */ |
e6142f2e JG |
398 | DBG("Removing %s", kconsumer_data.err_unix_sock_path); |
399 | (void) unlink(kconsumer_data.err_unix_sock_path); | |
400 | ||
401 | DBG("Removing directory %s", config.kconsumerd_path.value); | |
402 | (void) rmdir(config.kconsumerd_path.value); | |
8c6c56c2 MD |
403 | |
404 | /* ust consumerd 32 */ | |
e6142f2e JG |
405 | DBG("Removing %s", config.consumerd32_err_unix_sock_path.value); |
406 | (void) unlink(config.consumerd32_err_unix_sock_path.value); | |
407 | ||
408 | DBG("Removing directory %s", config.consumerd32_path.value); | |
409 | (void) rmdir(config.consumerd32_path.value); | |
8c6c56c2 MD |
410 | |
411 | /* ust consumerd 64 */ | |
e6142f2e JG |
412 | DBG("Removing %s", config.consumerd64_err_unix_sock_path.value); |
413 | (void) unlink(config.consumerd64_err_unix_sock_path.value); | |
414 | ||
415 | DBG("Removing directory %s", config.consumerd64_path.value); | |
416 | (void) rmdir(config.consumerd64_path.value); | |
5461b305 | 417 | |
99d688f2 | 418 | pthread_mutex_destroy(&session_list->lock); |
273ea72c | 419 | |
4e4714cb JR |
420 | wait_consumer(&kconsumer_data); |
421 | wait_consumer(&ustconsumer64_data); | |
422 | wait_consumer(&ustconsumer32_data); | |
423 | ||
6a4e4039 JG |
424 | DBG("Cleaning up all agent apps"); |
425 | agent_app_ht_clean(); | |
426 | ||
099e26bd | 427 | DBG("Closing all UST sockets"); |
56fff090 | 428 | ust_app_clean_list(); |
7972aab2 | 429 | buffer_reg_destroy_registries(); |
099e26bd | 430 | |
e6142f2e | 431 | if (is_root && !config.no_kernel) { |
4fba7219 | 432 | DBG2("Closing kernel fd"); |
a4b35e07 | 433 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
434 | ret = close(kernel_tracer_fd); |
435 | if (ret) { | |
436 | PERROR("close"); | |
437 | } | |
a4b35e07 | 438 | } |
2f50c8a3 | 439 | DBG("Unloading kernel modules"); |
096102bd | 440 | modprobe_remove_lttng_all(); |
834978fd | 441 | free(syscall_table); |
2f50c8a3 | 442 | } |
2f77fc4b | 443 | |
e975f9f8 DG |
444 | close_consumer_sockets(); |
445 | ||
ef367a93 JG |
446 | if (load_info) { |
447 | load_session_destroy_data(load_info); | |
448 | free(load_info); | |
449 | } | |
450 | ||
c9cb3e7d JG |
451 | /* |
452 | * We do NOT rmdir rundir because there are other processes | |
453 | * using it, for instance lttng-relayd, which can start in | |
454 | * parallel with this teardown. | |
455 | */ | |
4a15001e MD |
456 | } |
457 | ||
458 | /* | |
459 | * Cleanup the daemon's option data structures. | |
460 | */ | |
461 | static void sessiond_cleanup_options(void) | |
462 | { | |
463 | DBG("Cleaning up options"); | |
464 | ||
e6142f2e | 465 | sessiond_config_fini(&config); |
c9cb3e7d | 466 | |
7567352f | 467 | run_as_destroy_worker(); |
fac6795d DG |
468 | } |
469 | ||
e065084a | 470 | /* |
d063d709 | 471 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 472 | * |
d063d709 | 473 | * Return lttcomm error code. |
e065084a DG |
474 | */ |
475 | static int send_unix_sock(int sock, void *buf, size_t len) | |
476 | { | |
477 | /* Check valid length */ | |
c617c0c6 | 478 | if (len == 0) { |
e065084a DG |
479 | return -1; |
480 | } | |
481 | ||
482 | return lttcomm_send_unix_sock(sock, buf, len); | |
483 | } | |
484 | ||
5461b305 | 485 | /* |
d063d709 | 486 | * Free memory of a command context structure. |
5461b305 | 487 | */ |
a2fb29a5 | 488 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 489 | { |
a2fb29a5 DG |
490 | DBG("Clean command context structure"); |
491 | if (*cmd_ctx) { | |
492 | if ((*cmd_ctx)->llm) { | |
493 | free((*cmd_ctx)->llm); | |
5461b305 | 494 | } |
a2fb29a5 DG |
495 | if ((*cmd_ctx)->lsm) { |
496 | free((*cmd_ctx)->lsm); | |
5461b305 | 497 | } |
a2fb29a5 DG |
498 | free(*cmd_ctx); |
499 | *cmd_ctx = NULL; | |
5461b305 DG |
500 | } |
501 | } | |
502 | ||
fac6795d | 503 | /* |
0fdd1e2c | 504 | * Notify UST applications using the shm mmap futex. |
fac6795d | 505 | */ |
0fdd1e2c | 506 | static int notify_ust_apps(int active) |
fac6795d | 507 | { |
0fdd1e2c | 508 | char *wait_shm_mmap; |
fac6795d | 509 | |
0fdd1e2c | 510 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 511 | |
0fdd1e2c | 512 | /* See shm.c for this call implying mmap, shm and futex calls */ |
e6142f2e | 513 | wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root); |
0fdd1e2c | 514 | if (wait_shm_mmap == NULL) { |
fac6795d DG |
515 | goto error; |
516 | } | |
517 | ||
0fdd1e2c DG |
518 | /* Wake waiting process */ |
519 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
520 | ||
521 | /* Apps notified successfully */ | |
522 | return 0; | |
fac6795d DG |
523 | |
524 | error: | |
0fdd1e2c | 525 | return -1; |
fac6795d DG |
526 | } |
527 | ||
e065084a | 528 | /* |
d063d709 DG |
529 | * Setup the outgoing data buffer for the response (llm) by allocating the |
530 | * right amount of memory and copying the original information from the lsm | |
531 | * structure. | |
ca95a216 | 532 | * |
6e10c9b9 | 533 | * Return 0 on success, negative value on error. |
ca95a216 | 534 | */ |
6e10c9b9 PP |
535 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
536 | const void *payload_buf, size_t payload_len, | |
537 | const void *cmd_header_buf, size_t cmd_header_len) | |
ca95a216 | 538 | { |
6e10c9b9 PP |
539 | int ret = 0; |
540 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
541 | const size_t cmd_header_offset = header_len; | |
542 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
543 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
ca95a216 | 544 | |
6e10c9b9 | 545 | cmd_ctx->llm = zmalloc(total_msg_size); |
5461b305 | 546 | |
5461b305 | 547 | if (cmd_ctx->llm == NULL) { |
76d7553f | 548 | PERROR("zmalloc"); |
5461b305 | 549 | ret = -ENOMEM; |
6e10c9b9 | 550 | goto end; |
ca95a216 DG |
551 | } |
552 | ||
5461b305 DG |
553 | /* Copy common data */ |
554 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 555 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
6e10c9b9 PP |
556 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
557 | cmd_ctx->llm->data_size = payload_len; | |
558 | cmd_ctx->lttng_msg_size = total_msg_size; | |
5461b305 | 559 | |
6e10c9b9 | 560 | /* Copy command header */ |
b4e3ceb9 PP |
561 | if (cmd_header_len) { |
562 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
563 | cmd_header_len); | |
564 | } | |
5461b305 | 565 | |
6e10c9b9 | 566 | /* Copy payload */ |
b4e3ceb9 PP |
567 | if (payload_len) { |
568 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
569 | payload_len); | |
570 | } | |
ca95a216 | 571 | |
6e10c9b9 | 572 | end: |
ca95a216 DG |
573 | return ret; |
574 | } | |
575 | ||
6e10c9b9 PP |
576 | /* |
577 | * Version of setup_lttng_msg() without command header. | |
578 | */ | |
579 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
580 | void *payload_buf, size_t payload_len) | |
581 | { | |
582 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
583 | } | |
7a485870 | 584 | /* |
5eb91c98 | 585 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 586 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 587 | */ |
5eb91c98 | 588 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 589 | { |
5eb91c98 | 590 | int ret; |
7a485870 | 591 | struct ltt_kernel_channel *channel; |
e32d7f27 JG |
592 | struct ltt_session *session; |
593 | const struct ltt_session_list *session_list = session_get_list(); | |
7a485870 | 594 | |
5eb91c98 | 595 | DBG("Updating kernel poll set"); |
7a485870 | 596 | |
54d01ffb | 597 | session_lock_list(); |
e32d7f27 JG |
598 | cds_list_for_each_entry(session, &session_list->head, list) { |
599 | if (!session_get(session)) { | |
600 | continue; | |
601 | } | |
54d01ffb | 602 | session_lock(session); |
7a485870 | 603 | if (session->kernel_session == NULL) { |
54d01ffb | 604 | session_unlock(session); |
e32d7f27 | 605 | session_put(session); |
7a485870 DG |
606 | continue; |
607 | } | |
7a485870 | 608 | |
54d01ffb DG |
609 | cds_list_for_each_entry(channel, |
610 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
611 | /* Add channel fd to the kernel poll set */ |
612 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
613 | if (ret < 0) { | |
54d01ffb | 614 | session_unlock(session); |
e32d7f27 | 615 | session_put(session); |
5eb91c98 DG |
616 | goto error; |
617 | } | |
618 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 619 | } |
54d01ffb | 620 | session_unlock(session); |
7a485870 | 621 | } |
54d01ffb | 622 | session_unlock_list(); |
7a485870 | 623 | |
5eb91c98 | 624 | return 0; |
7a485870 DG |
625 | |
626 | error: | |
54d01ffb | 627 | session_unlock_list(); |
7a485870 DG |
628 | return -1; |
629 | } | |
630 | ||
631 | /* | |
54d01ffb | 632 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 633 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 634 | * |
d063d709 | 635 | * Useful for CPU hotplug feature. |
7a485870 | 636 | */ |
7f032058 | 637 | static int update_kernel_stream(int fd) |
7a485870 DG |
638 | { |
639 | int ret = 0; | |
640 | struct ltt_session *session; | |
173af62f | 641 | struct ltt_kernel_session *ksess; |
7a485870 | 642 | struct ltt_kernel_channel *channel; |
e32d7f27 | 643 | const struct ltt_session_list *session_list = session_get_list(); |
7a485870 DG |
644 | |
645 | DBG("Updating kernel streams for channel fd %d", fd); | |
646 | ||
54d01ffb | 647 | session_lock_list(); |
e32d7f27 JG |
648 | cds_list_for_each_entry(session, &session_list->head, list) { |
649 | if (!session_get(session)) { | |
650 | continue; | |
651 | } | |
54d01ffb | 652 | session_lock(session); |
7a485870 | 653 | if (session->kernel_session == NULL) { |
54d01ffb | 654 | session_unlock(session); |
e32d7f27 | 655 | session_put(session); |
7a485870 DG |
656 | continue; |
657 | } | |
173af62f | 658 | ksess = session->kernel_session; |
d9800920 | 659 | |
4a15001e MD |
660 | cds_list_for_each_entry(channel, |
661 | &ksess->channel_list.head, list) { | |
662 | struct lttng_ht_iter iter; | |
663 | struct consumer_socket *socket; | |
d9800920 | 664 | |
4a15001e MD |
665 | if (channel->fd != fd) { |
666 | continue; | |
667 | } | |
668 | DBG("Channel found, updating kernel streams"); | |
669 | ret = kernel_open_channel_stream(channel); | |
670 | if (ret < 0) { | |
671 | goto error; | |
672 | } | |
673 | /* Update the stream global counter */ | |
674 | ksess->stream_count_global += ret; | |
675 | ||
676 | /* | |
677 | * Have we already sent fds to the consumer? If yes, it | |
678 | * means that tracing is started so it is safe to send | |
679 | * our updated stream fds. | |
680 | */ | |
681 | if (ksess->consumer_fds_sent != 1 | |
682 | || ksess->consumer == NULL) { | |
683 | ret = -1; | |
684 | goto error; | |
685 | } | |
686 | ||
687 | rcu_read_lock(); | |
688 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
689 | &iter.iter, socket, node.node) { | |
690 | pthread_mutex_lock(socket->lock); | |
1fc1b7c8 | 691 | ret = kernel_consumer_send_channel_streams(socket, |
4a15001e MD |
692 | channel, ksess, |
693 | session->output_traces ? 1 : 0); | |
694 | pthread_mutex_unlock(socket->lock); | |
695 | if (ret < 0) { | |
e7fe706f | 696 | rcu_read_unlock(); |
4a15001e | 697 | goto error; |
7a485870 | 698 | } |
7a485870 | 699 | } |
4a15001e | 700 | rcu_read_unlock(); |
7a485870 | 701 | } |
54d01ffb | 702 | session_unlock(session); |
e32d7f27 | 703 | session_put(session); |
7a485870 | 704 | } |
54d01ffb | 705 | session_unlock_list(); |
b3c750d2 | 706 | return ret; |
7a485870 | 707 | |
b3c750d2 | 708 | error: |
54d01ffb | 709 | session_unlock(session); |
e32d7f27 | 710 | session_put(session); |
54d01ffb | 711 | session_unlock_list(); |
7a485870 DG |
712 | return ret; |
713 | } | |
714 | ||
487cf67c | 715 | /* |
ffe60014 DG |
716 | * For each tracing session, update newly registered apps. The session list |
717 | * lock MUST be acquired before calling this. | |
487cf67c DG |
718 | */ |
719 | static void update_ust_app(int app_sock) | |
720 | { | |
721 | struct ltt_session *sess, *stmp; | |
e32d7f27 | 722 | const struct ltt_session_list *session_list = session_get_list(); |
487cf67c | 723 | |
fdadac08 DG |
724 | /* Consumer is in an ERROR state. Stop any application update. */ |
725 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
726 | /* Stop the update process since the consumer is dead. */ | |
727 | return; | |
728 | } | |
729 | ||
487cf67c | 730 | /* For all tracing session(s) */ |
e32d7f27 | 731 | cds_list_for_each_entry_safe(sess, stmp, &session_list->head, list) { |
a9ad0c8f MD |
732 | struct ust_app *app; |
733 | ||
e32d7f27 JG |
734 | if (!session_get(sess)) { |
735 | continue; | |
736 | } | |
4ee14516 | 737 | session_lock(sess); |
a9ad0c8f MD |
738 | if (!sess->ust_session) { |
739 | goto unlock_session; | |
740 | } | |
741 | ||
742 | rcu_read_lock(); | |
743 | assert(app_sock >= 0); | |
744 | app = ust_app_find_by_sock(app_sock); | |
745 | if (app == NULL) { | |
746 | /* | |
747 | * Application can be unregistered before so | |
748 | * this is possible hence simply stopping the | |
749 | * update. | |
750 | */ | |
751 | DBG3("UST app update failed to find app sock %d", | |
752 | app_sock); | |
753 | goto unlock_rcu; | |
421cb601 | 754 | } |
a9ad0c8f MD |
755 | ust_app_global_update(sess->ust_session, app); |
756 | unlock_rcu: | |
757 | rcu_read_unlock(); | |
758 | unlock_session: | |
4ee14516 | 759 | session_unlock(sess); |
e32d7f27 | 760 | session_put(sess); |
487cf67c DG |
761 | } |
762 | } | |
763 | ||
7a485870 | 764 | /* |
d063d709 | 765 | * This thread manage event coming from the kernel. |
7a485870 | 766 | * |
d063d709 DG |
767 | * Features supported in this thread: |
768 | * -) CPU Hotplug | |
7a485870 DG |
769 | */ |
770 | static void *thread_manage_kernel(void *data) | |
771 | { | |
139ac872 | 772 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 773 | uint32_t revents, nb_fd; |
7a485870 | 774 | char tmp; |
5eb91c98 | 775 | struct lttng_poll_event events; |
7a485870 | 776 | |
6993eeb3 | 777 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 778 | |
6c71277b | 779 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 780 | |
d5d63bf1 DG |
781 | /* |
782 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 783 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 784 | */ |
6d737ce4 | 785 | lttng_poll_init(&events); |
d5d63bf1 | 786 | |
e547b070 | 787 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
788 | goto error_testpoint; |
789 | } | |
8ac94142 | 790 | |
840cb59c | 791 | health_code_update(); |
44a5e5eb | 792 | |
e547b070 | 793 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 794 | goto error_testpoint; |
6993eeb3 CB |
795 | } |
796 | ||
7a485870 | 797 | while (1) { |
840cb59c | 798 | health_code_update(); |
44a5e5eb | 799 | |
7a485870 | 800 | if (update_poll_flag == 1) { |
d21b0d71 DG |
801 | /* Clean events object. We are about to populate it again. */ |
802 | lttng_poll_clean(&events); | |
803 | ||
d0b96690 | 804 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
805 | if (ret < 0) { |
806 | goto error_poll_create; | |
807 | } | |
808 | ||
809 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
810 | if (ret < 0) { | |
811 | goto error; | |
812 | } | |
5f822d0a | 813 | |
d21b0d71 | 814 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
815 | ret = update_kernel_poll(&events); |
816 | if (ret < 0) { | |
7a485870 DG |
817 | goto error; |
818 | } | |
819 | update_poll_flag = 0; | |
820 | } | |
821 | ||
7fa2082e | 822 | DBG("Thread kernel polling"); |
7a485870 DG |
823 | |
824 | /* Poll infinite value of time */ | |
88f2b785 | 825 | restart: |
a78af745 | 826 | health_poll_entry(); |
5eb91c98 | 827 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
828 | DBG("Thread kernel return from poll on %d fds", |
829 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 830 | health_poll_exit(); |
7a485870 | 831 | if (ret < 0) { |
88f2b785 MD |
832 | /* |
833 | * Restart interrupted system call. | |
834 | */ | |
835 | if (errno == EINTR) { | |
836 | goto restart; | |
837 | } | |
7a485870 DG |
838 | goto error; |
839 | } else if (ret == 0) { | |
840 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
841 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
842 | "This should not have happened! Continuing..."); | |
7a485870 DG |
843 | continue; |
844 | } | |
845 | ||
0d9c5d77 DG |
846 | nb_fd = ret; |
847 | ||
5eb91c98 DG |
848 | for (i = 0; i < nb_fd; i++) { |
849 | /* Fetch once the poll data */ | |
850 | revents = LTTNG_POLL_GETEV(&events, i); | |
851 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 852 | |
840cb59c | 853 | health_code_update(); |
44a5e5eb | 854 | |
fd20dac9 MD |
855 | if (!revents) { |
856 | /* No activity for this FD (poll implementation). */ | |
857 | continue; | |
858 | } | |
859 | ||
5eb91c98 | 860 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 861 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 862 | if (ret) { |
139ac872 MD |
863 | err = 0; |
864 | goto exit; | |
5eb91c98 | 865 | } |
7a485870 | 866 | |
5eb91c98 | 867 | /* Check for data on kernel pipe */ |
03e43155 MD |
868 | if (revents & LPOLLIN) { |
869 | if (pollfd == kernel_poll_pipe[0]) { | |
870 | (void) lttng_read(kernel_poll_pipe[0], | |
871 | &tmp, 1); | |
872 | /* | |
873 | * Ret value is useless here, if this pipe gets any actions an | |
874 | * update is required anyway. | |
875 | */ | |
876 | update_poll_flag = 1; | |
877 | continue; | |
878 | } else { | |
879 | /* | |
880 | * New CPU detected by the kernel. Adding kernel stream to | |
881 | * kernel session and updating the kernel consumer | |
882 | */ | |
7f032058 | 883 | ret = update_kernel_stream(pollfd); |
5eb91c98 DG |
884 | if (ret < 0) { |
885 | continue; | |
886 | } | |
887 | break; | |
7a485870 | 888 | } |
03e43155 MD |
889 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
890 | update_poll_flag = 1; | |
891 | continue; | |
892 | } else { | |
893 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
894 | goto error; | |
7a485870 DG |
895 | } |
896 | } | |
897 | } | |
898 | ||
139ac872 | 899 | exit: |
7a485870 | 900 | error: |
5eb91c98 | 901 | lttng_poll_clean(&events); |
76d7553f | 902 | error_poll_create: |
6993eeb3 | 903 | error_testpoint: |
6620da75 DG |
904 | utils_close_pipe(kernel_poll_pipe); |
905 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 906 | if (err) { |
840cb59c | 907 | health_error(); |
139ac872 | 908 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
909 | WARN("Kernel thread died unexpectedly. " |
910 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 911 | } |
8782cc74 | 912 | health_unregister(health_sessiond); |
76d7553f | 913 | DBG("Kernel thread dying"); |
7a485870 DG |
914 | return NULL; |
915 | } | |
916 | ||
a23ec3a7 DG |
917 | /* |
918 | * Signal pthread condition of the consumer data that the thread. | |
919 | */ | |
920 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
921 | { | |
922 | pthread_mutex_lock(&data->cond_mutex); | |
923 | ||
924 | /* | |
925 | * The state is set before signaling. It can be any value, it's the waiter | |
926 | * job to correctly interpret this condition variable associated to the | |
927 | * consumer pthread_cond. | |
928 | * | |
929 | * A value of 0 means that the corresponding thread of the consumer data | |
930 | * was not started. 1 indicates that the thread has started and is ready | |
931 | * for action. A negative value means that there was an error during the | |
932 | * thread bootstrap. | |
933 | */ | |
934 | data->consumer_thread_is_ready = state; | |
935 | (void) pthread_cond_signal(&data->cond); | |
936 | ||
937 | pthread_mutex_unlock(&data->cond_mutex); | |
938 | } | |
939 | ||
1d4b027a | 940 | /* |
3bd1e081 | 941 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 942 | */ |
3bd1e081 | 943 | static void *thread_manage_consumer(void *data) |
1d4b027a | 944 | { |
42fc1d0b | 945 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
5eb91c98 | 946 | uint32_t revents, nb_fd; |
1d4b027a | 947 | enum lttcomm_return_code code; |
5eb91c98 | 948 | struct lttng_poll_event events; |
3bd1e081 | 949 | struct consumer_data *consumer_data = data; |
b3530820 | 950 | struct consumer_socket *cmd_socket_wrapper = NULL; |
1d4b027a | 951 | |
3bd1e081 | 952 | DBG("[thread] Manage consumer started"); |
1d4b027a | 953 | |
34c1e15a MD |
954 | rcu_register_thread(); |
955 | rcu_thread_online(); | |
956 | ||
6c71277b | 957 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 958 | |
855060f8 | 959 | health_code_update(); |
9449cc75 | 960 | |
5eb91c98 | 961 | /* |
331744e3 JD |
962 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
963 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 964 | */ |
331744e3 | 965 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 966 | if (ret < 0) { |
76d7553f | 967 | goto error_poll; |
5eb91c98 | 968 | } |
273ea72c | 969 | |
edb8b045 DG |
970 | /* |
971 | * The error socket here is already in a listening state which was done | |
972 | * just before spawning this thread to avoid a race between the consumer | |
973 | * daemon exec trying to connect and the listen() call. | |
974 | */ | |
3bd1e081 | 975 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
976 | if (ret < 0) { |
977 | goto error; | |
978 | } | |
979 | ||
840cb59c | 980 | health_code_update(); |
44a5e5eb | 981 | |
331744e3 | 982 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 983 | restart: |
a78af745 | 984 | health_poll_entry(); |
8ac94142 | 985 | |
e547b070 | 986 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
987 | goto error; |
988 | } | |
8ac94142 | 989 | |
5eb91c98 | 990 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 991 | health_poll_exit(); |
273ea72c | 992 | if (ret < 0) { |
88f2b785 MD |
993 | /* |
994 | * Restart interrupted system call. | |
995 | */ | |
996 | if (errno == EINTR) { | |
997 | goto restart; | |
998 | } | |
273ea72c DG |
999 | goto error; |
1000 | } | |
1001 | ||
0d9c5d77 DG |
1002 | nb_fd = ret; |
1003 | ||
5eb91c98 DG |
1004 | for (i = 0; i < nb_fd; i++) { |
1005 | /* Fetch once the poll data */ | |
1006 | revents = LTTNG_POLL_GETEV(&events, i); | |
1007 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1008 | ||
840cb59c | 1009 | health_code_update(); |
44a5e5eb | 1010 | |
fd20dac9 MD |
1011 | if (!revents) { |
1012 | /* No activity for this FD (poll implementation). */ | |
1013 | continue; | |
1014 | } | |
1015 | ||
5eb91c98 | 1016 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1017 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1018 | if (ret) { |
139ac872 MD |
1019 | err = 0; |
1020 | goto exit; | |
5eb91c98 DG |
1021 | } |
1022 | ||
1023 | /* Event on the registration socket */ | |
3bd1e081 | 1024 | if (pollfd == consumer_data->err_sock) { |
03e43155 MD |
1025 | if (revents & LPOLLIN) { |
1026 | continue; | |
1027 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1028 | ERR("consumer err socket poll error"); |
5eb91c98 | 1029 | goto error; |
03e43155 MD |
1030 | } else { |
1031 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1032 | goto error; | |
5eb91c98 DG |
1033 | } |
1034 | } | |
273ea72c DG |
1035 | } |
1036 | ||
3bd1e081 | 1037 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1038 | if (sock < 0) { |
1039 | goto error; | |
1040 | } | |
1041 | ||
b662582b DG |
1042 | /* |
1043 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1044 | * show must go on. | |
1045 | */ | |
1046 | (void) utils_set_fd_cloexec(sock); | |
1047 | ||
840cb59c | 1048 | health_code_update(); |
44a5e5eb | 1049 | |
3bd1e081 | 1050 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1051 | |
712ea556 | 1052 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1053 | ret = lttcomm_recv_unix_sock(sock, &code, |
1054 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1055 | if (ret <= 0) { |
1056 | goto error; | |
1057 | } | |
1058 | ||
840cb59c | 1059 | health_code_update(); |
b3530820 | 1060 | if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
3bd1e081 | 1061 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1062 | lttcomm_get_readable_code(-code)); |
1063 | goto error; | |
1064 | } | |
1065 | ||
b3530820 JG |
1066 | /* Connect both command and metadata sockets. */ |
1067 | consumer_data->cmd_sock = | |
1068 | lttcomm_connect_unix_sock( | |
1069 | consumer_data->cmd_unix_sock_path); | |
1070 | consumer_data->metadata_fd = | |
1071 | lttcomm_connect_unix_sock( | |
1072 | consumer_data->cmd_unix_sock_path); | |
1073 | if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) { | |
1074 | PERROR("consumer connect cmd socket"); | |
1075 | /* On error, signal condition and quit. */ | |
1076 | signal_consumer_condition(consumer_data, -1); | |
1077 | goto error; | |
1078 | } | |
1079 | ||
1080 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; | |
1081 | ||
1082 | /* Create metadata socket lock. */ | |
1083 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1084 | if (consumer_data->metadata_sock.lock == NULL) { | |
1085 | PERROR("zmalloc pthread mutex"); | |
1086 | goto error; | |
1087 | } | |
1088 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1089 | ||
1090 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); | |
1091 | DBG("Consumer metadata socket ready (fd: %d)", | |
1092 | consumer_data->metadata_fd); | |
1093 | ||
1094 | /* | |
1095 | * Remove the consumerd error sock since we've established a connection. | |
1096 | */ | |
3bd1e081 | 1097 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1098 | if (ret < 0) { |
72079cae DG |
1099 | goto error; |
1100 | } | |
1101 | ||
331744e3 | 1102 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1103 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1104 | if (ret < 0) { | |
72079cae | 1105 | goto error; |
5eb91c98 DG |
1106 | } |
1107 | ||
331744e3 | 1108 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1109 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1110 | LPOLLIN | LPOLLRDHUP); |
1111 | if (ret < 0) { | |
1112 | goto error; | |
1113 | } | |
1114 | ||
840cb59c | 1115 | health_code_update(); |
44a5e5eb | 1116 | |
b3530820 | 1117 | /* |
62c43103 | 1118 | * Transfer the write-end of the channel monitoring and rotate pipe |
92816cc3 | 1119 | * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE command. |
b3530820 JG |
1120 | */ |
1121 | cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock); | |
1122 | if (!cmd_socket_wrapper) { | |
1123 | goto error; | |
1124 | } | |
3e4dc117 | 1125 | cmd_socket_wrapper->lock = &consumer_data->lock; |
b3530820 JG |
1126 | |
1127 | ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper, | |
1128 | consumer_data->channel_monitor_pipe); | |
1129 | if (ret) { | |
1130 | goto error; | |
1131 | } | |
62c43103 | 1132 | |
b3530820 JG |
1133 | /* Discard the socket wrapper as it is no longer needed. */ |
1134 | consumer_destroy_socket(cmd_socket_wrapper); | |
1135 | cmd_socket_wrapper = NULL; | |
1136 | ||
1137 | /* The thread is completely initialized, signal that it is ready. */ | |
1138 | signal_consumer_condition(consumer_data, 1); | |
1139 | ||
331744e3 | 1140 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1141 | restart_poll: |
331744e3 | 1142 | while (1) { |
42fc1d0b DG |
1143 | health_code_update(); |
1144 | ||
1145 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
1146 | if (should_quit) { | |
1147 | /* Not a health error. */ | |
1148 | err = 0; | |
1149 | goto exit; | |
1150 | } | |
1151 | ||
331744e3 JD |
1152 | health_poll_entry(); |
1153 | ret = lttng_poll_wait(&events, -1); | |
1154 | health_poll_exit(); | |
1155 | if (ret < 0) { | |
1156 | /* | |
1157 | * Restart interrupted system call. | |
1158 | */ | |
1159 | if (errno == EINTR) { | |
1160 | goto restart_poll; | |
1161 | } | |
1162 | goto error; | |
88f2b785 | 1163 | } |
72079cae | 1164 | |
331744e3 | 1165 | nb_fd = ret; |
0d9c5d77 | 1166 | |
331744e3 JD |
1167 | for (i = 0; i < nb_fd; i++) { |
1168 | /* Fetch once the poll data */ | |
1169 | revents = LTTNG_POLL_GETEV(&events, i); | |
1170 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1171 | |
331744e3 | 1172 | health_code_update(); |
44a5e5eb | 1173 | |
fd20dac9 MD |
1174 | if (!revents) { |
1175 | /* No activity for this FD (poll implementation). */ | |
1176 | continue; | |
1177 | } | |
1178 | ||
42fc1d0b DG |
1179 | /* |
1180 | * Thread quit pipe has been triggered, flag that we should stop | |
1181 | * but continue the current loop to handle potential data from | |
1182 | * consumer. | |
1183 | */ | |
1184 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); | |
5eb91c98 | 1185 | |
331744e3 JD |
1186 | if (pollfd == sock) { |
1187 | /* Event on the consumerd socket */ | |
03e43155 MD |
1188 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1189 | && !(revents & LPOLLIN)) { | |
331744e3 JD |
1190 | ERR("consumer err socket second poll error"); |
1191 | goto error; | |
1192 | } | |
1193 | health_code_update(); | |
1194 | /* Wait for any kconsumerd error */ | |
1195 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1196 | sizeof(enum lttcomm_return_code)); | |
1197 | if (ret <= 0) { | |
1198 | ERR("consumer closed the command socket"); | |
1199 | goto error; | |
1200 | } | |
1201 | ||
1202 | ERR("consumer return code : %s", | |
1203 | lttcomm_get_readable_code(-code)); | |
1204 | ||
1205 | goto exit; | |
4ce514c4 | 1206 | } else if (pollfd == consumer_data->metadata_fd) { |
03e43155 MD |
1207 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
1208 | && !(revents & LPOLLIN)) { | |
1209 | ERR("consumer err metadata socket second poll error"); | |
1210 | goto error; | |
1211 | } | |
331744e3 JD |
1212 | /* UST metadata requests */ |
1213 | ret = ust_consumer_metadata_request( | |
1214 | &consumer_data->metadata_sock); | |
1215 | if (ret < 0) { | |
1216 | ERR("Handling metadata request"); | |
1217 | goto error; | |
1218 | } | |
5eb91c98 | 1219 | } |
42fc1d0b | 1220 | /* No need for an else branch all FDs are tested prior. */ |
5eb91c98 | 1221 | } |
331744e3 | 1222 | health_code_update(); |
5eb91c98 DG |
1223 | } |
1224 | ||
139ac872 | 1225 | exit: |
1d4b027a | 1226 | error: |
fdadac08 DG |
1227 | /* |
1228 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1229 | * thread might be using them so get exclusive access which will abort all |
1230 | * other consumer command by other threads. | |
fdadac08 DG |
1231 | */ |
1232 | pthread_mutex_lock(&consumer_data->lock); | |
1233 | ||
5c827ce0 DG |
1234 | /* Immediately set the consumerd state to stopped */ |
1235 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1236 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1237 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1238 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1239 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1240 | } else { | |
1241 | /* Code flow error... */ | |
1242 | assert(0); | |
1243 | } | |
1244 | ||
76d7553f MD |
1245 | if (consumer_data->err_sock >= 0) { |
1246 | ret = close(consumer_data->err_sock); | |
1247 | if (ret) { | |
1248 | PERROR("close"); | |
1249 | } | |
a76cbd9f | 1250 | consumer_data->err_sock = -1; |
76d7553f MD |
1251 | } |
1252 | if (consumer_data->cmd_sock >= 0) { | |
1253 | ret = close(consumer_data->cmd_sock); | |
1254 | if (ret) { | |
1255 | PERROR("close"); | |
1256 | } | |
a76cbd9f | 1257 | consumer_data->cmd_sock = -1; |
76d7553f | 1258 | } |
96544455 SS |
1259 | if (consumer_data->metadata_sock.fd_ptr && |
1260 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1261 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1262 | if (ret) { |
1263 | PERROR("close"); | |
1264 | } | |
1265 | } | |
76d7553f MD |
1266 | if (sock >= 0) { |
1267 | ret = close(sock); | |
1268 | if (ret) { | |
1269 | PERROR("close"); | |
1270 | } | |
1271 | } | |
273ea72c | 1272 | |
3bd1e081 MD |
1273 | unlink(consumer_data->err_unix_sock_path); |
1274 | unlink(consumer_data->cmd_unix_sock_path); | |
fdadac08 | 1275 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1276 | |
fdadac08 | 1277 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1278 | if (consumer_data->metadata_sock.lock) { |
1279 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1280 | free(consumer_data->metadata_sock.lock); | |
1281 | } | |
5eb91c98 | 1282 | lttng_poll_clean(&events); |
b3530820 JG |
1283 | |
1284 | if (cmd_socket_wrapper) { | |
1285 | consumer_destroy_socket(cmd_socket_wrapper); | |
1286 | } | |
76d7553f | 1287 | error_poll: |
139ac872 | 1288 | if (err) { |
840cb59c | 1289 | health_error(); |
139ac872 MD |
1290 | ERR("Health error occurred in %s", __func__); |
1291 | } | |
8782cc74 | 1292 | health_unregister(health_sessiond); |
76d7553f | 1293 | DBG("consumer thread cleanup completed"); |
0177d773 | 1294 | |
34c1e15a MD |
1295 | rcu_thread_offline(); |
1296 | rcu_unregister_thread(); | |
1297 | ||
5eb91c98 | 1298 | return NULL; |
099e26bd DG |
1299 | } |
1300 | ||
099e26bd | 1301 | /* |
81f04d5f JG |
1302 | * This thread receives application command sockets (FDs) on the |
1303 | * apps_cmd_pipe and waits (polls) on them until they are closed | |
1304 | * or an error occurs. | |
1305 | * | |
1306 | * At that point, it flushes the data (tracing and metadata) associated | |
1307 | * with this application and tears down ust app sessions and other | |
1308 | * associated data structures through ust_app_unregister(). | |
1309 | * | |
1310 | * Note that this thread never sends commands to the applications | |
1311 | * through the command sockets; it merely listens for hang-ups | |
1312 | * and errors on those sockets and cleans-up as they occur. | |
1d4b027a DG |
1313 | */ |
1314 | static void *thread_manage_apps(void *data) | |
099e26bd | 1315 | { |
139ac872 | 1316 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1317 | ssize_t size_ret; |
5eb91c98 | 1318 | uint32_t revents, nb_fd; |
5eb91c98 | 1319 | struct lttng_poll_event events; |
099e26bd DG |
1320 | |
1321 | DBG("[thread] Manage application started"); | |
1322 | ||
f6a9efaa DG |
1323 | rcu_register_thread(); |
1324 | rcu_thread_online(); | |
1325 | ||
6c71277b | 1326 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1327 | |
e547b070 | 1328 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1329 | goto error_testpoint; |
1330 | } | |
1331 | ||
840cb59c | 1332 | health_code_update(); |
44a5e5eb | 1333 | |
d0b96690 | 1334 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1335 | if (ret < 0) { |
76d7553f | 1336 | goto error_poll_create; |
5eb91c98 | 1337 | } |
099e26bd | 1338 | |
5eb91c98 DG |
1339 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1340 | if (ret < 0) { | |
1341 | goto error; | |
1342 | } | |
099e26bd | 1343 | |
e547b070 | 1344 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1345 | goto error; |
1346 | } | |
8ac94142 | 1347 | |
840cb59c | 1348 | health_code_update(); |
44a5e5eb | 1349 | |
5eb91c98 | 1350 | while (1) { |
7fa2082e | 1351 | DBG("Apps thread polling"); |
099e26bd DG |
1352 | |
1353 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1354 | restart: |
a78af745 | 1355 | health_poll_entry(); |
5eb91c98 | 1356 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1357 | DBG("Apps thread return from poll on %d fds", |
1358 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1359 | health_poll_exit(); |
099e26bd | 1360 | if (ret < 0) { |
88f2b785 MD |
1361 | /* |
1362 | * Restart interrupted system call. | |
1363 | */ | |
1364 | if (errno == EINTR) { | |
1365 | goto restart; | |
1366 | } | |
099e26bd DG |
1367 | goto error; |
1368 | } | |
1369 | ||
0d9c5d77 DG |
1370 | nb_fd = ret; |
1371 | ||
5eb91c98 DG |
1372 | for (i = 0; i < nb_fd; i++) { |
1373 | /* Fetch once the poll data */ | |
1374 | revents = LTTNG_POLL_GETEV(&events, i); | |
1375 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1376 | ||
840cb59c | 1377 | health_code_update(); |
44a5e5eb | 1378 | |
fd20dac9 MD |
1379 | if (!revents) { |
1380 | /* No activity for this FD (poll implementation). */ | |
1381 | continue; | |
1382 | } | |
1383 | ||
5eb91c98 | 1384 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1385 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1386 | if (ret) { |
139ac872 MD |
1387 | err = 0; |
1388 | goto exit; | |
5eb91c98 | 1389 | } |
099e26bd | 1390 | |
5eb91c98 DG |
1391 | /* Inspect the apps cmd pipe */ |
1392 | if (pollfd == apps_cmd_pipe[0]) { | |
03e43155 | 1393 | if (revents & LPOLLIN) { |
d0b96690 DG |
1394 | int sock; |
1395 | ||
5eb91c98 | 1396 | /* Empty pipe */ |
6cd525e8 MD |
1397 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1398 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1399 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1400 | goto error; |
1401 | } | |
099e26bd | 1402 | |
840cb59c | 1403 | health_code_update(); |
44a5e5eb | 1404 | |
ffe60014 | 1405 | /* |
03e43155 MD |
1406 | * Since this is a command socket (write then read), |
1407 | * we only monitor the error events of the socket. | |
ffe60014 | 1408 | */ |
d0b96690 DG |
1409 | ret = lttng_poll_add(&events, sock, |
1410 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1411 | if (ret < 0) { | |
5eb91c98 | 1412 | goto error; |
e0c7ec2b | 1413 | } |
acc7b41b | 1414 | |
d0b96690 | 1415 | DBG("Apps with sock %d added to poll set", sock); |
03e43155 MD |
1416 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1417 | ERR("Apps command pipe error"); | |
1418 | goto error; | |
1419 | } else { | |
1420 | ERR("Unknown poll events %u for sock %d", revents, pollfd); | |
1421 | goto error; | |
0177d773 | 1422 | } |
5eb91c98 DG |
1423 | } else { |
1424 | /* | |
54d01ffb DG |
1425 | * At this point, we know that a registered application made |
1426 | * the event at poll_wait. | |
5eb91c98 DG |
1427 | */ |
1428 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1429 | /* Removing from the poll set */ | |
1430 | ret = lttng_poll_del(&events, pollfd); | |
1431 | if (ret < 0) { | |
1432 | goto error; | |
1433 | } | |
099e26bd | 1434 | |
b9d9b220 | 1435 | /* Socket closed on remote end. */ |
56fff090 | 1436 | ust_app_unregister(pollfd); |
03e43155 MD |
1437 | } else { |
1438 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1439 | goto error; | |
5eb91c98 | 1440 | } |
099e26bd | 1441 | } |
44a5e5eb | 1442 | |
840cb59c | 1443 | health_code_update(); |
099e26bd | 1444 | } |
099e26bd DG |
1445 | } |
1446 | ||
139ac872 | 1447 | exit: |
099e26bd | 1448 | error: |
5eb91c98 | 1449 | lttng_poll_clean(&events); |
76d7553f | 1450 | error_poll_create: |
6993eeb3 | 1451 | error_testpoint: |
6620da75 DG |
1452 | utils_close_pipe(apps_cmd_pipe); |
1453 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1454 | ||
1455 | /* | |
1456 | * We don't clean the UST app hash table here since already registered | |
1457 | * applications can still be controlled so let them be until the session | |
1458 | * daemon dies or the applications stop. | |
1459 | */ | |
1460 | ||
139ac872 | 1461 | if (err) { |
840cb59c | 1462 | health_error(); |
139ac872 MD |
1463 | ERR("Health error occurred in %s", __func__); |
1464 | } | |
8782cc74 | 1465 | health_unregister(health_sessiond); |
76d7553f | 1466 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1467 | rcu_thread_offline(); |
1468 | rcu_unregister_thread(); | |
099e26bd DG |
1469 | return NULL; |
1470 | } | |
1471 | ||
d0b96690 | 1472 | /* |
d88aee68 DG |
1473 | * Send a socket to a thread This is called from the dispatch UST registration |
1474 | * thread once all sockets are set for the application. | |
d0b96690 | 1475 | * |
b85dc84c DG |
1476 | * The sock value can be invalid, we don't really care, the thread will handle |
1477 | * it and make the necessary cleanup if so. | |
1478 | * | |
d0b96690 DG |
1479 | * On success, return 0 else a negative value being the errno message of the |
1480 | * write(). | |
1481 | */ | |
d88aee68 | 1482 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1483 | { |
6cd525e8 | 1484 | ssize_t ret; |
d0b96690 | 1485 | |
b85dc84c DG |
1486 | /* |
1487 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1488 | * before calling this function being a shutdown state of the thread. | |
1489 | */ | |
1490 | if (fd < 0) { | |
1491 | ret = -EBADF; | |
1492 | goto error; | |
1493 | } | |
d0b96690 | 1494 | |
6cd525e8 MD |
1495 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1496 | if (ret < sizeof(sock)) { | |
d88aee68 | 1497 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1498 | if (ret < 0) { |
1499 | ret = -errno; | |
1500 | } | |
1501 | goto error; | |
1502 | } | |
1503 | ||
1504 | /* All good. Don't send back the write positive ret value. */ | |
1505 | ret = 0; | |
1506 | error: | |
6cd525e8 | 1507 | return (int) ret; |
d0b96690 DG |
1508 | } |
1509 | ||
f45e313d DG |
1510 | /* |
1511 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1512 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1513 | * notify socket is never received. | |
1514 | */ | |
1515 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1516 | { | |
1517 | int ret, nb_fd = 0, i; | |
1518 | unsigned int fd_added = 0; | |
1519 | struct lttng_poll_event events; | |
1520 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1521 | ||
1522 | assert(wait_queue); | |
1523 | ||
1524 | lttng_poll_init(&events); | |
1525 | ||
1526 | /* Just skip everything for an empty queue. */ | |
1527 | if (!wait_queue->count) { | |
1528 | goto end; | |
1529 | } | |
1530 | ||
1531 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1532 | if (ret < 0) { | |
1533 | goto error_create; | |
1534 | } | |
1535 | ||
1536 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1537 | &wait_queue->head, head) { | |
1538 | assert(wait_node->app); | |
1539 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1540 | LPOLLHUP | LPOLLERR); | |
1541 | if (ret < 0) { | |
1542 | goto error; | |
1543 | } | |
1544 | ||
1545 | fd_added = 1; | |
1546 | } | |
1547 | ||
1548 | if (!fd_added) { | |
1549 | goto end; | |
1550 | } | |
1551 | ||
1552 | /* | |
1553 | * Poll but don't block so we can quickly identify the faulty events and | |
1554 | * clean them afterwards from the wait queue. | |
1555 | */ | |
1556 | ret = lttng_poll_wait(&events, 0); | |
1557 | if (ret < 0) { | |
1558 | goto error; | |
1559 | } | |
1560 | nb_fd = ret; | |
1561 | ||
1562 | for (i = 0; i < nb_fd; i++) { | |
1563 | /* Get faulty FD. */ | |
1564 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1565 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1566 | ||
fd20dac9 MD |
1567 | if (!revents) { |
1568 | /* No activity for this FD (poll implementation). */ | |
1569 | continue; | |
1570 | } | |
1571 | ||
f45e313d DG |
1572 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1573 | &wait_queue->head, head) { | |
1574 | if (pollfd == wait_node->app->sock && | |
1575 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1576 | cds_list_del(&wait_node->head); | |
1577 | wait_queue->count--; | |
1578 | ust_app_destroy(wait_node->app); | |
1579 | free(wait_node); | |
48b40bcf JG |
1580 | /* |
1581 | * Silence warning of use-after-free in | |
1582 | * cds_list_for_each_entry_safe which uses | |
1583 | * __typeof__(*wait_node). | |
1584 | */ | |
1585 | wait_node = NULL; | |
f45e313d | 1586 | break; |
03e43155 MD |
1587 | } else { |
1588 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1589 | goto error; | |
f45e313d DG |
1590 | } |
1591 | } | |
1592 | } | |
1593 | ||
1594 | if (nb_fd > 0) { | |
1595 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1596 | } | |
1597 | ||
1598 | end: | |
1599 | lttng_poll_clean(&events); | |
1600 | return; | |
1601 | ||
1602 | error: | |
1603 | lttng_poll_clean(&events); | |
1604 | error_create: | |
1605 | ERR("Unable to sanitize wait queue"); | |
1606 | return; | |
1607 | } | |
1608 | ||
099e26bd DG |
1609 | /* |
1610 | * Dispatch request from the registration threads to the application | |
1611 | * communication thread. | |
1612 | */ | |
1613 | static void *thread_dispatch_ust_registration(void *data) | |
1614 | { | |
12e2b881 | 1615 | int ret, err = -1; |
8bdee6e2 | 1616 | struct cds_wfcq_node *node; |
099e26bd | 1617 | struct ust_command *ust_cmd = NULL; |
f45e313d DG |
1618 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1619 | struct ust_reg_wait_queue wait_queue = { | |
1620 | .count = 0, | |
1621 | }; | |
d0b96690 | 1622 | |
967e3668 MD |
1623 | rcu_register_thread(); |
1624 | ||
6c71277b | 1625 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1626 | |
9ad42ec1 MD |
1627 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1628 | goto error_testpoint; | |
1629 | } | |
1630 | ||
12e2b881 MD |
1631 | health_code_update(); |
1632 | ||
f45e313d | 1633 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1634 | |
1635 | DBG("[thread] Dispatch UST command started"); | |
1636 | ||
0ed3b1a8 | 1637 | for (;;) { |
12e2b881 MD |
1638 | health_code_update(); |
1639 | ||
099e26bd DG |
1640 | /* Atomically prepare the queue futex */ |
1641 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1642 | ||
0ed3b1a8 MD |
1643 | if (CMM_LOAD_SHARED(dispatch_thread_exit)) { |
1644 | break; | |
1645 | } | |
1646 | ||
099e26bd | 1647 | do { |
d0b96690 | 1648 | struct ust_app *app = NULL; |
7972aab2 | 1649 | ust_cmd = NULL; |
d0b96690 | 1650 | |
f45e313d DG |
1651 | /* |
1652 | * Make sure we don't have node(s) that have hung up before receiving | |
1653 | * the notify socket. This is to clean the list in order to avoid | |
1654 | * memory leaks from notify socket that are never seen. | |
1655 | */ | |
1656 | sanitize_wait_queue(&wait_queue); | |
1657 | ||
12e2b881 | 1658 | health_code_update(); |
099e26bd | 1659 | /* Dequeue command for registration */ |
8bdee6e2 | 1660 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 1661 | if (node == NULL) { |
00a17c97 | 1662 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1663 | /* Continue thread execution */ |
1664 | break; | |
1665 | } | |
1666 | ||
1667 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1668 | ||
2f50c8a3 DG |
1669 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1670 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1671 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1672 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1673 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1674 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1675 | |
1676 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1677 | wait_node = zmalloc(sizeof(*wait_node)); | |
1678 | if (!wait_node) { | |
1679 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1680 | ret = close(ust_cmd->sock); |
1681 | if (ret < 0) { | |
1682 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1683 | } | |
51dec90d | 1684 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1685 | free(ust_cmd); |
d0b96690 DG |
1686 | goto error; |
1687 | } | |
1688 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1689 | ||
1690 | /* Create application object if socket is CMD. */ | |
1691 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1692 | ust_cmd->sock); | |
1693 | if (!wait_node->app) { | |
1694 | ret = close(ust_cmd->sock); | |
1695 | if (ret < 0) { | |
1696 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1697 | } |
51dec90d | 1698 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1699 | free(wait_node); |
7972aab2 | 1700 | free(ust_cmd); |
d0b96690 DG |
1701 | continue; |
1702 | } | |
1703 | /* | |
1704 | * Add application to the wait queue so we can set the notify | |
1705 | * socket before putting this object in the global ht. | |
1706 | */ | |
f45e313d DG |
1707 | cds_list_add(&wait_node->head, &wait_queue.head); |
1708 | wait_queue.count++; | |
d0b96690 | 1709 | |
7972aab2 | 1710 | free(ust_cmd); |
d0b96690 DG |
1711 | /* |
1712 | * We have to continue here since we don't have the notify | |
1713 | * socket and the application MUST be added to the hash table | |
1714 | * only at that moment. | |
1715 | */ | |
1716 | continue; | |
1717 | } else { | |
1718 | /* | |
1719 | * Look for the application in the local wait queue and set the | |
1720 | * notify socket if found. | |
1721 | */ | |
d88aee68 | 1722 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1723 | &wait_queue.head, head) { |
12e2b881 | 1724 | health_code_update(); |
d0b96690 DG |
1725 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1726 | wait_node->app->notify_sock = ust_cmd->sock; | |
1727 | cds_list_del(&wait_node->head); | |
f45e313d | 1728 | wait_queue.count--; |
d0b96690 DG |
1729 | app = wait_node->app; |
1730 | free(wait_node); | |
1731 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1732 | break; | |
1733 | } | |
1734 | } | |
020d7f60 DG |
1735 | |
1736 | /* | |
1737 | * With no application at this stage the received socket is | |
1738 | * basically useless so close it before we free the cmd data | |
1739 | * structure for good. | |
1740 | */ | |
1741 | if (!app) { | |
1742 | ret = close(ust_cmd->sock); | |
1743 | if (ret < 0) { | |
1744 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1745 | } | |
51dec90d | 1746 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1747 | } |
7972aab2 | 1748 | free(ust_cmd); |
d0b96690 DG |
1749 | } |
1750 | ||
1751 | if (app) { | |
d0b96690 DG |
1752 | /* |
1753 | * @session_lock_list | |
1754 | * | |
1755 | * Lock the global session list so from the register up to the | |
1756 | * registration done message, no thread can see the application | |
1757 | * and change its state. | |
1758 | */ | |
1759 | session_lock_list(); | |
1760 | rcu_read_lock(); | |
d88aee68 | 1761 | |
d0b96690 DG |
1762 | /* |
1763 | * Add application to the global hash table. This needs to be | |
1764 | * done before the update to the UST registry can locate the | |
1765 | * application. | |
1766 | */ | |
1767 | ust_app_add(app); | |
d88aee68 DG |
1768 | |
1769 | /* Set app version. This call will print an error if needed. */ | |
1770 | (void) ust_app_version(app); | |
1771 | ||
1772 | /* Send notify socket through the notify pipe. */ | |
1773 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1774 | app->notify_sock); | |
1775 | if (ret < 0) { | |
1776 | rcu_read_unlock(); | |
1777 | session_unlock_list(); | |
b85dc84c DG |
1778 | /* |
1779 | * No notify thread, stop the UST tracing. However, this is | |
1780 | * not an internal error of the this thread thus setting | |
1781 | * the health error code to a normal exit. | |
1782 | */ | |
1783 | err = 0; | |
d88aee68 | 1784 | goto error; |
6620da75 | 1785 | } |
d88aee68 | 1786 | |
d0b96690 DG |
1787 | /* |
1788 | * Update newly registered application with the tracing | |
1789 | * registry info already enabled information. | |
1790 | */ | |
1791 | update_ust_app(app->sock); | |
d88aee68 DG |
1792 | |
1793 | /* | |
1794 | * Don't care about return value. Let the manage apps threads | |
1795 | * handle app unregistration upon socket close. | |
1796 | */ | |
fb45065e | 1797 | (void) ust_app_register_done(app); |
d88aee68 DG |
1798 | |
1799 | /* | |
1800 | * Even if the application socket has been closed, send the app | |
1801 | * to the thread and unregistration will take place at that | |
1802 | * place. | |
1803 | */ | |
1804 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1805 | if (ret < 0) { |
d88aee68 DG |
1806 | rcu_read_unlock(); |
1807 | session_unlock_list(); | |
b85dc84c DG |
1808 | /* |
1809 | * No apps. thread, stop the UST tracing. However, this is | |
1810 | * not an internal error of the this thread thus setting | |
1811 | * the health error code to a normal exit. | |
1812 | */ | |
1813 | err = 0; | |
d88aee68 | 1814 | goto error; |
d0b96690 | 1815 | } |
d88aee68 | 1816 | |
d0b96690 DG |
1817 | rcu_read_unlock(); |
1818 | session_unlock_list(); | |
099e26bd | 1819 | } |
099e26bd DG |
1820 | } while (node != NULL); |
1821 | ||
12e2b881 | 1822 | health_poll_entry(); |
099e26bd DG |
1823 | /* Futex wait on queue. Blocking call on futex() */ |
1824 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 1825 | health_poll_exit(); |
099e26bd | 1826 | } |
12e2b881 MD |
1827 | /* Normal exit, no error */ |
1828 | err = 0; | |
099e26bd DG |
1829 | |
1830 | error: | |
d88aee68 DG |
1831 | /* Clean up wait queue. */ |
1832 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 1833 | &wait_queue.head, head) { |
d88aee68 | 1834 | cds_list_del(&wait_node->head); |
f45e313d | 1835 | wait_queue.count--; |
d88aee68 DG |
1836 | free(wait_node); |
1837 | } | |
1838 | ||
772b8f4d MD |
1839 | /* Empty command queue. */ |
1840 | for (;;) { | |
1841 | /* Dequeue command for registration */ | |
1842 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); | |
1843 | if (node == NULL) { | |
1844 | break; | |
1845 | } | |
1846 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1847 | ret = close(ust_cmd->sock); | |
1848 | if (ret < 0) { | |
1849 | PERROR("close ust sock exit dispatch %d", ust_cmd->sock); | |
1850 | } | |
1851 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1852 | free(ust_cmd); | |
1853 | } | |
1854 | ||
9ad42ec1 | 1855 | error_testpoint: |
099e26bd | 1856 | DBG("Dispatch thread dying"); |
12e2b881 MD |
1857 | if (err) { |
1858 | health_error(); | |
1859 | ERR("Health error occurred in %s", __func__); | |
1860 | } | |
8782cc74 | 1861 | health_unregister(health_sessiond); |
967e3668 | 1862 | rcu_unregister_thread(); |
099e26bd DG |
1863 | return NULL; |
1864 | } | |
1865 | ||
1866 | /* | |
1867 | * This thread manage application registration. | |
1868 | */ | |
1869 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1870 | { |
139ac872 | 1871 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
1872 | uint32_t revents, nb_fd; |
1873 | struct lttng_poll_event events; | |
099e26bd DG |
1874 | /* |
1875 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1876 | * freed in the manage apps thread. | |
1877 | */ | |
1878 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1879 | |
099e26bd | 1880 | DBG("[thread] Manage application registration started"); |
1d4b027a | 1881 | |
6c71277b | 1882 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 1883 | |
e547b070 | 1884 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
1885 | goto error_testpoint; |
1886 | } | |
8ac94142 | 1887 | |
1d4b027a DG |
1888 | ret = lttcomm_listen_unix_sock(apps_sock); |
1889 | if (ret < 0) { | |
76d7553f | 1890 | goto error_listen; |
1d4b027a DG |
1891 | } |
1892 | ||
5eb91c98 DG |
1893 | /* |
1894 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1895 | * more will be added to this poll set. | |
1896 | */ | |
d0b96690 | 1897 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1898 | if (ret < 0) { |
76d7553f | 1899 | goto error_create_poll; |
5eb91c98 | 1900 | } |
273ea72c | 1901 | |
5eb91c98 DG |
1902 | /* Add the application registration socket */ |
1903 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1904 | if (ret < 0) { | |
76d7553f | 1905 | goto error_poll_add; |
5eb91c98 | 1906 | } |
273ea72c | 1907 | |
1d4b027a | 1908 | /* Notify all applications to register */ |
0fdd1e2c DG |
1909 | ret = notify_ust_apps(1); |
1910 | if (ret < 0) { | |
1911 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1912 | "Execution continues but there might be problem for already\n" |
1913 | "running applications that wishes to register."); | |
0fdd1e2c | 1914 | } |
1d4b027a DG |
1915 | |
1916 | while (1) { | |
1917 | DBG("Accepting application registration"); | |
273ea72c DG |
1918 | |
1919 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1920 | restart: |
a78af745 | 1921 | health_poll_entry(); |
5eb91c98 | 1922 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1923 | health_poll_exit(); |
273ea72c | 1924 | if (ret < 0) { |
88f2b785 MD |
1925 | /* |
1926 | * Restart interrupted system call. | |
1927 | */ | |
1928 | if (errno == EINTR) { | |
1929 | goto restart; | |
1930 | } | |
273ea72c DG |
1931 | goto error; |
1932 | } | |
1933 | ||
0d9c5d77 DG |
1934 | nb_fd = ret; |
1935 | ||
5eb91c98 | 1936 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 1937 | health_code_update(); |
139ac872 | 1938 | |
5eb91c98 DG |
1939 | /* Fetch once the poll data */ |
1940 | revents = LTTNG_POLL_GETEV(&events, i); | |
1941 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1942 | |
fd20dac9 MD |
1943 | if (!revents) { |
1944 | /* No activity for this FD (poll implementation). */ | |
1945 | continue; | |
1946 | } | |
1947 | ||
5eb91c98 | 1948 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1949 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1950 | if (ret) { |
139ac872 MD |
1951 | err = 0; |
1952 | goto exit; | |
90014c57 | 1953 | } |
1d4b027a | 1954 | |
5eb91c98 DG |
1955 | /* Event on the registration socket */ |
1956 | if (pollfd == apps_sock) { | |
03e43155 | 1957 | if (revents & LPOLLIN) { |
5eb91c98 DG |
1958 | sock = lttcomm_accept_unix_sock(apps_sock); |
1959 | if (sock < 0) { | |
1960 | goto error; | |
1961 | } | |
099e26bd | 1962 | |
16c5c8fa DG |
1963 | /* |
1964 | * Set socket timeout for both receiving and ending. | |
1965 | * app_socket_timeout is in seconds, whereas | |
1966 | * lttcomm_setsockopt_rcv_timeout and | |
1967 | * lttcomm_setsockopt_snd_timeout expect msec as | |
1968 | * parameter. | |
1969 | */ | |
e6142f2e | 1970 | if (config.app_socket_timeout >= 0) { |
28ce0ff2 | 1971 | (void) lttcomm_setsockopt_rcv_timeout(sock, |
e6142f2e | 1972 | config.app_socket_timeout * 1000); |
28ce0ff2 | 1973 | (void) lttcomm_setsockopt_snd_timeout(sock, |
e6142f2e | 1974 | config.app_socket_timeout * 1000); |
28ce0ff2 | 1975 | } |
16c5c8fa | 1976 | |
b662582b DG |
1977 | /* |
1978 | * Set the CLOEXEC flag. Return code is useless because | |
1979 | * either way, the show must go on. | |
1980 | */ | |
1981 | (void) utils_set_fd_cloexec(sock); | |
1982 | ||
5eb91c98 | 1983 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1984 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1985 | if (ust_cmd == NULL) { |
76d7553f | 1986 | PERROR("ust command zmalloc"); |
41ed8e47 MD |
1987 | ret = close(sock); |
1988 | if (ret) { | |
1989 | PERROR("close"); | |
1990 | } | |
5eb91c98 DG |
1991 | goto error; |
1992 | } | |
1d4b027a | 1993 | |
5eb91c98 DG |
1994 | /* |
1995 | * Using message-based transmissions to ensure we don't | |
1996 | * have to deal with partially received messages. | |
1997 | */ | |
4063050c MD |
1998 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
1999 | if (ret < 0) { | |
2000 | ERR("Exhausted file descriptors allowed for applications."); | |
2001 | free(ust_cmd); | |
2002 | ret = close(sock); | |
2003 | if (ret) { | |
2004 | PERROR("close"); | |
2005 | } | |
2006 | sock = -1; | |
2007 | continue; | |
2008 | } | |
d88aee68 | 2009 | |
840cb59c | 2010 | health_code_update(); |
d0b96690 DG |
2011 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
2012 | if (ret < 0) { | |
5eb91c98 | 2013 | free(ust_cmd); |
d0b96690 | 2014 | /* Close socket of the application. */ |
76d7553f MD |
2015 | ret = close(sock); |
2016 | if (ret) { | |
2017 | PERROR("close"); | |
2018 | } | |
4063050c | 2019 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 2020 | sock = -1; |
5eb91c98 DG |
2021 | continue; |
2022 | } | |
840cb59c | 2023 | health_code_update(); |
099e26bd | 2024 | |
5eb91c98 | 2025 | ust_cmd->sock = sock; |
34a2494f | 2026 | sock = -1; |
099e26bd | 2027 | |
5eb91c98 DG |
2028 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2029 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2030 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2031 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2032 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2033 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2034 | |
5eb91c98 DG |
2035 | /* |
2036 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2037 | * has been taken! This apps will be part of the *system*. |
5eb91c98 | 2038 | */ |
8bdee6e2 | 2039 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
5eb91c98 DG |
2040 | |
2041 | /* | |
2042 | * Wake the registration queue futex. Implicit memory | |
8bdee6e2 | 2043 | * barrier with the exchange in cds_wfcq_enqueue. |
5eb91c98 DG |
2044 | */ |
2045 | futex_nto1_wake(&ust_cmd_queue.futex); | |
03e43155 MD |
2046 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2047 | ERR("Register apps socket poll error"); | |
2048 | goto error; | |
2049 | } else { | |
2050 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2051 | goto error; | |
5eb91c98 DG |
2052 | } |
2053 | } | |
90014c57 | 2054 | } |
1d4b027a DG |
2055 | } |
2056 | ||
139ac872 | 2057 | exit: |
1d4b027a | 2058 | error: |
0fdd1e2c DG |
2059 | /* Notify that the registration thread is gone */ |
2060 | notify_ust_apps(0); | |
2061 | ||
a4b35e07 | 2062 | if (apps_sock >= 0) { |
76d7553f MD |
2063 | ret = close(apps_sock); |
2064 | if (ret) { | |
2065 | PERROR("close"); | |
2066 | } | |
a4b35e07 | 2067 | } |
46c3f085 | 2068 | if (sock >= 0) { |
76d7553f MD |
2069 | ret = close(sock); |
2070 | if (ret) { | |
2071 | PERROR("close"); | |
2072 | } | |
4063050c | 2073 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2074 | } |
e6142f2e | 2075 | unlink(config.apps_unix_sock_path.value); |
0fdd1e2c | 2076 | |
76d7553f | 2077 | error_poll_add: |
5eb91c98 | 2078 | lttng_poll_clean(&events); |
76d7553f MD |
2079 | error_listen: |
2080 | error_create_poll: | |
6993eeb3 | 2081 | error_testpoint: |
76d7553f | 2082 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2083 | if (err) { |
2084 | health_error(); | |
2085 | ERR("Health error occurred in %s", __func__); | |
2086 | } | |
8782cc74 | 2087 | health_unregister(health_sessiond); |
5eb91c98 | 2088 | |
1d4b027a DG |
2089 | return NULL; |
2090 | } | |
2091 | ||
8c0faa1d | 2092 | /* |
3bd1e081 | 2093 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2094 | * exec or it will fails. |
8c0faa1d | 2095 | */ |
3bd1e081 | 2096 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2097 | { |
a23ec3a7 | 2098 | int ret, clock_ret; |
ee0b0061 DG |
2099 | struct timespec timeout; |
2100 | ||
13a7bce3 JG |
2101 | /* |
2102 | * Make sure we set the readiness flag to 0 because we are NOT ready. | |
2103 | * This access to consumer_thread_is_ready does not need to be | |
2104 | * protected by consumer_data.cond_mutex (yet) since the consumer | |
2105 | * management thread has not been started at this point. | |
2106 | */ | |
a23ec3a7 | 2107 | consumer_data->consumer_thread_is_ready = 0; |
8c0faa1d | 2108 | |
a23ec3a7 DG |
2109 | /* Setup pthread condition */ |
2110 | ret = pthread_condattr_init(&consumer_data->condattr); | |
4a15001e | 2111 | if (ret) { |
a23ec3a7 DG |
2112 | errno = ret; |
2113 | PERROR("pthread_condattr_init consumer data"); | |
2114 | goto error; | |
2115 | } | |
2116 | ||
2117 | /* | |
2118 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2119 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2120 | * for a more details and how we noticed it. | |
2121 | */ | |
2122 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
4a15001e | 2123 | if (ret) { |
a23ec3a7 DG |
2124 | errno = ret; |
2125 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2126 | goto error; |
2127 | } | |
8c0faa1d | 2128 | |
a23ec3a7 | 2129 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
4a15001e | 2130 | if (ret) { |
a23ec3a7 DG |
2131 | errno = ret; |
2132 | PERROR("pthread_cond_init consumer data"); | |
2133 | goto error; | |
2134 | } | |
2135 | ||
1a1a34b4 MJ |
2136 | ret = pthread_create(&consumer_data->thread, default_pthread_attr(), |
2137 | thread_manage_consumer, consumer_data); | |
4a15001e MD |
2138 | if (ret) { |
2139 | errno = ret; | |
3bd1e081 | 2140 | PERROR("pthread_create consumer"); |
ee0b0061 | 2141 | ret = -1; |
8c0faa1d DG |
2142 | goto error; |
2143 | } | |
2144 | ||
a23ec3a7 DG |
2145 | /* We are about to wait on a pthread condition */ |
2146 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2147 | ||
ee0b0061 | 2148 | /* Get time for sem_timedwait absolute timeout */ |
389fbf04 | 2149 | clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout); |
a23ec3a7 DG |
2150 | /* |
2151 | * Set the timeout for the condition timed wait even if the clock gettime | |
2152 | * call fails since we might loop on that call and we want to avoid to | |
2153 | * increment the timeout too many times. | |
2154 | */ | |
2155 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2156 | ||
2157 | /* | |
2158 | * The following loop COULD be skipped in some conditions so this is why we | |
2159 | * set ret to 0 in order to make sure at least one round of the loop is | |
2160 | * done. | |
2161 | */ | |
2162 | ret = 0; | |
2163 | ||
2164 | /* | |
2165 | * Loop until the condition is reached or when a timeout is reached. Note | |
2166 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2167 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2168 | * possible. This loop does not take any chances and works with both of | |
2169 | * them. | |
2170 | */ | |
2171 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2172 | if (clock_ret < 0) { | |
2173 | PERROR("clock_gettime spawn consumer"); | |
2174 | /* Infinite wait for the consumerd thread to be ready */ | |
2175 | ret = pthread_cond_wait(&consumer_data->cond, | |
2176 | &consumer_data->cond_mutex); | |
2177 | } else { | |
2178 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2179 | &consumer_data->cond_mutex, &timeout); | |
2180 | } | |
ee0b0061 | 2181 | } |
8c0faa1d | 2182 | |
a23ec3a7 DG |
2183 | /* Release the pthread condition */ |
2184 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2185 | ||
2186 | if (ret != 0) { | |
2187 | errno = ret; | |
2188 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2189 | int pth_ret; |
2190 | ||
ee0b0061 DG |
2191 | /* |
2192 | * Call has timed out so we kill the kconsumerd_thread and return | |
2193 | * an error. | |
2194 | */ | |
a23ec3a7 DG |
2195 | ERR("Condition timed out. The consumer thread was never ready." |
2196 | " Killing it"); | |
4282f9a3 DG |
2197 | pth_ret = pthread_cancel(consumer_data->thread); |
2198 | if (pth_ret < 0) { | |
3bd1e081 | 2199 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2200 | } |
2201 | } else { | |
a23ec3a7 | 2202 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2203 | } |
4282f9a3 DG |
2204 | /* Caller is expecting a negative value on failure. */ |
2205 | ret = -1; | |
ee0b0061 DG |
2206 | goto error; |
2207 | } | |
2208 | ||
3bd1e081 MD |
2209 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2210 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2211 | ERR("Consumerd did not start"); |
3bd1e081 | 2212 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2213 | goto error; |
2214 | } | |
3bd1e081 | 2215 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2216 | |
8c0faa1d DG |
2217 | return 0; |
2218 | ||
2219 | error: | |
2220 | return ret; | |
2221 | } | |
2222 | ||
d9800920 | 2223 | /* |
3bd1e081 | 2224 | * Join consumer thread |
d9800920 | 2225 | */ |
3bd1e081 | 2226 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2227 | { |
2228 | void *status; | |
cf3af59e | 2229 | |
e8209f6b DG |
2230 | /* Consumer pid must be a real one. */ |
2231 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2232 | int ret; |
3bd1e081 | 2233 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2234 | if (ret) { |
4a15001e | 2235 | PERROR("Error killing consumer daemon"); |
cf3af59e MD |
2236 | return ret; |
2237 | } | |
3bd1e081 | 2238 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2239 | } else { |
2240 | return 0; | |
2241 | } | |
2242 | } | |
2243 | ||
8c0faa1d | 2244 | /* |
3bd1e081 | 2245 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2246 | * |
d063d709 | 2247 | * Return pid if successful else -1. |
8c0faa1d | 2248 | */ |
3bd1e081 | 2249 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2250 | { |
2251 | int ret; | |
2252 | pid_t pid; | |
94c55f17 | 2253 | const char *consumer_to_use; |
53086306 | 2254 | const char *verbosity; |
94c55f17 | 2255 | struct stat st; |
8c0faa1d | 2256 | |
3bd1e081 | 2257 | DBG("Spawning consumerd"); |
c49dc785 | 2258 | |
8c0faa1d DG |
2259 | pid = fork(); |
2260 | if (pid == 0) { | |
2261 | /* | |
3bd1e081 | 2262 | * Exec consumerd. |
8c0faa1d | 2263 | */ |
e6142f2e | 2264 | if (config.verbose_consumer) { |
53086306 | 2265 | verbosity = "--verbose"; |
4421f712 | 2266 | } else if (lttng_opt_quiet) { |
53086306 | 2267 | verbosity = "--quiet"; |
4421f712 DG |
2268 | } else { |
2269 | verbosity = ""; | |
53086306 | 2270 | } |
4421f712 | 2271 | |
3bd1e081 MD |
2272 | switch (consumer_data->type) { |
2273 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2274 | /* |
c7704d57 DG |
2275 | * Find out which consumerd to execute. We will first try the |
2276 | * 64-bit path, then the sessiond's installation directory, and | |
2277 | * fallback on the 32-bit one, | |
94c55f17 | 2278 | */ |
63a799e8 | 2279 | DBG3("Looking for a kernel consumer at these locations:"); |
59ee5091 | 2280 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); |
e6142f2e | 2281 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
59ee5091 | 2282 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); |
e6142f2e | 2283 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { |
63a799e8 | 2284 | DBG3("Found location #1"); |
e6142f2e JG |
2285 | consumer_to_use = config.consumerd64_bin_path.value; |
2286 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
63a799e8 | 2287 | DBG3("Found location #2"); |
e6142f2e | 2288 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; |
a1a9f823 JG |
2289 | } else if (config.consumerd32_bin_path.value && |
2290 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
63a799e8 | 2291 | DBG3("Found location #3"); |
e6142f2e | 2292 | consumer_to_use = config.consumerd32_bin_path.value; |
94c55f17 | 2293 | } else { |
63a799e8 | 2294 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2295 | ret = -EINVAL; |
3d678709 | 2296 | goto error; |
94c55f17 AM |
2297 | } |
2298 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
6e2cc8d8 | 2299 | (void) execl(consumer_to_use, |
94c55f17 AM |
2300 | "lttng-consumerd", verbosity, "-k", |
2301 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2302 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2303 | "--group", config.tracing_group_name.value, |
94c55f17 | 2304 | NULL); |
3bd1e081 | 2305 | break; |
7753dea8 MD |
2306 | case LTTNG_CONSUMER64_UST: |
2307 | { | |
46b23495 | 2308 | if (config.consumerd64_lib_dir.value) { |
8f4905da MD |
2309 | char *tmp; |
2310 | size_t tmplen; | |
ddaec4a2 | 2311 | char *tmpnew; |
8f4905da | 2312 | |
e8fa9fb0 | 2313 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2314 | if (!tmp) { |
2315 | tmp = ""; | |
2316 | } | |
d222983e | 2317 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2318 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2319 | if (!tmpnew) { | |
2320 | ret = -ENOMEM; | |
2321 | goto error; | |
2322 | } | |
e6142f2e | 2323 | strcat(tmpnew, config.consumerd64_lib_dir.value); |
8f4905da MD |
2324 | if (tmp[0] != '\0') { |
2325 | strcat(tmpnew, ":"); | |
2326 | strcat(tmpnew, tmp); | |
2327 | } | |
d222983e | 2328 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
ddaec4a2 | 2329 | free(tmpnew); |
8f4905da MD |
2330 | if (ret) { |
2331 | ret = -errno; | |
2332 | goto error; | |
2333 | } | |
2334 | } | |
e6142f2e JG |
2335 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); |
2336 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2337 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2338 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2339 | "--group", config.tracing_group_name.value, |
7753dea8 | 2340 | NULL); |
3bd1e081 | 2341 | break; |
7753dea8 MD |
2342 | } |
2343 | case LTTNG_CONSUMER32_UST: | |
2344 | { | |
46b23495 | 2345 | if (config.consumerd32_lib_dir.value) { |
8f4905da MD |
2346 | char *tmp; |
2347 | size_t tmplen; | |
ddaec4a2 | 2348 | char *tmpnew; |
8f4905da | 2349 | |
e8fa9fb0 | 2350 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2351 | if (!tmp) { |
2352 | tmp = ""; | |
2353 | } | |
d222983e | 2354 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); |
8f4905da MD |
2355 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
2356 | if (!tmpnew) { | |
2357 | ret = -ENOMEM; | |
2358 | goto error; | |
2359 | } | |
e6142f2e | 2360 | strcat(tmpnew, config.consumerd32_lib_dir.value); |
8f4905da MD |
2361 | if (tmp[0] != '\0') { |
2362 | strcat(tmpnew, ":"); | |
2363 | strcat(tmpnew, tmp); | |
2364 | } | |
d222983e | 2365 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
ddaec4a2 | 2366 | free(tmpnew); |
8f4905da MD |
2367 | if (ret) { |
2368 | ret = -errno; | |
2369 | goto error; | |
2370 | } | |
2371 | } | |
e6142f2e JG |
2372 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); |
2373 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
7753dea8 MD |
2374 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2375 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
e6142f2e | 2376 | "--group", config.tracing_group_name.value, |
7753dea8 MD |
2377 | NULL); |
2378 | break; | |
2379 | } | |
3bd1e081 | 2380 | default: |
b60e7183 | 2381 | ERR("unknown consumer type"); |
e9d6b496 | 2382 | errno = 0; |
3bd1e081 | 2383 | } |
8c0faa1d | 2384 | if (errno != 0) { |
4282f9a3 | 2385 | PERROR("Consumer execl()"); |
8c0faa1d | 2386 | } |
4282f9a3 | 2387 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2388 | exit(EXIT_FAILURE); |
2389 | } else if (pid > 0) { | |
2390 | ret = pid; | |
8c0faa1d | 2391 | } else { |
76d7553f | 2392 | PERROR("start consumer fork"); |
8c0faa1d | 2393 | ret = -errno; |
8c0faa1d | 2394 | } |
8f4905da | 2395 | error: |
8c0faa1d DG |
2396 | return ret; |
2397 | } | |
2398 | ||
693bd40b | 2399 | /* |
3bd1e081 | 2400 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2401 | */ |
3bd1e081 | 2402 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2403 | { |
c617c0c6 | 2404 | int ret; |
edb8b045 DG |
2405 | |
2406 | /* | |
2407 | * Set the listen() state on the socket since there is a possible race | |
2408 | * between the exec() of the consumer daemon and this call if place in the | |
2409 | * consumer thread. See bug #366 for more details. | |
2410 | */ | |
2411 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2412 | if (ret < 0) { | |
2413 | goto error; | |
2414 | } | |
693bd40b | 2415 | |
3bd1e081 MD |
2416 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2417 | if (consumer_data->pid != 0) { | |
2418 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2419 | goto end; |
2420 | } | |
693bd40b | 2421 | |
3bd1e081 | 2422 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2423 | if (ret < 0) { |
3bd1e081 MD |
2424 | ERR("Spawning consumerd failed"); |
2425 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2426 | goto error; |
693bd40b | 2427 | } |
c49dc785 | 2428 | |
3bd1e081 MD |
2429 | /* Setting up the consumer_data pid */ |
2430 | consumer_data->pid = ret; | |
48842b30 | 2431 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2432 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2433 | |
3bd1e081 MD |
2434 | DBG2("Spawning consumer control thread"); |
2435 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2436 | if (ret < 0) { |
3bd1e081 | 2437 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2438 | goto error; |
2439 | } | |
2440 | ||
c49dc785 | 2441 | end: |
693bd40b DG |
2442 | return 0; |
2443 | ||
2444 | error: | |
331744e3 | 2445 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2446 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2447 | int err; |
2448 | ||
edb8b045 DG |
2449 | err = close(consumer_data->err_sock); |
2450 | if (err < 0) { | |
2451 | PERROR("close consumer data error socket"); | |
2452 | } | |
2453 | } | |
693bd40b DG |
2454 | return ret; |
2455 | } | |
2456 | ||
b73401da | 2457 | /* |
096102bd | 2458 | * Setup necessary data for kernel tracer action. |
b73401da | 2459 | */ |
096102bd | 2460 | static int init_kernel_tracer(void) |
b73401da DG |
2461 | { |
2462 | int ret; | |
b73401da | 2463 | |
096102bd DG |
2464 | /* Modprobe lttng kernel modules */ |
2465 | ret = modprobe_lttng_control(); | |
b73401da | 2466 | if (ret < 0) { |
b73401da DG |
2467 | goto error; |
2468 | } | |
2469 | ||
096102bd DG |
2470 | /* Open debugfs lttng */ |
2471 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2472 | if (kernel_tracer_fd < 0) { | |
2473 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b | 2474 | goto error_open; |
54d01ffb DG |
2475 | } |
2476 | ||
2f77fc4b | 2477 | /* Validate kernel version */ |
88076e89 JD |
2478 | ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version, |
2479 | &kernel_tracer_abi_version); | |
2f77fc4b DG |
2480 | if (ret < 0) { |
2481 | goto error_version; | |
b551a063 | 2482 | } |
54d01ffb | 2483 | |
2f77fc4b DG |
2484 | ret = modprobe_lttng_data(); |
2485 | if (ret < 0) { | |
2486 | goto error_modules; | |
54d01ffb DG |
2487 | } |
2488 | ||
6e21424e JR |
2489 | ret = kernel_supports_ring_buffer_snapshot_sample_positions( |
2490 | kernel_tracer_fd); | |
2491 | if (ret < 0) { | |
2492 | goto error_modules; | |
2493 | } | |
2494 | ||
2495 | if (ret < 1) { | |
2496 | WARN("Kernel tracer does not support buffer monitoring. " | |
2497 | "The monitoring timer of channels in the kernel domain " | |
2498 | "will be set to 0 (disabled)."); | |
2499 | } | |
2500 | ||
2f77fc4b DG |
2501 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2502 | return 0; | |
2503 | ||
2504 | error_version: | |
2505 | modprobe_remove_lttng_control(); | |
2506 | ret = close(kernel_tracer_fd); | |
2507 | if (ret) { | |
2508 | PERROR("close"); | |
b551a063 | 2509 | } |
2f77fc4b | 2510 | kernel_tracer_fd = -1; |
f73fabfd | 2511 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2512 | |
2f77fc4b DG |
2513 | error_modules: |
2514 | ret = close(kernel_tracer_fd); | |
2515 | if (ret) { | |
2516 | PERROR("close"); | |
b551a063 | 2517 | } |
54d01ffb | 2518 | |
2f77fc4b DG |
2519 | error_open: |
2520 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2521 | |
2522 | error: | |
2f77fc4b DG |
2523 | WARN("No kernel tracer available"); |
2524 | kernel_tracer_fd = -1; | |
2525 | if (!is_root) { | |
f73fabfd | 2526 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2527 | } else { |
f73fabfd | 2528 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2529 | } |
54d01ffb DG |
2530 | } |
2531 | ||
2f77fc4b | 2532 | |
54d01ffb | 2533 | /* |
2f77fc4b DG |
2534 | * Copy consumer output from the tracing session to the domain session. The |
2535 | * function also applies the right modification on a per domain basis for the | |
2536 | * trace files destination directory. | |
36b588ed MD |
2537 | * |
2538 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2539 | */ |
2f77fc4b | 2540 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2541 | { |
2542 | int ret; | |
2f77fc4b DG |
2543 | const char *dir_name; |
2544 | struct consumer_output *consumer; | |
2545 | ||
2546 | assert(session); | |
2547 | assert(session->consumer); | |
54d01ffb | 2548 | |
b551a063 DG |
2549 | switch (domain) { |
2550 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2551 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2552 | /* |
2553 | * XXX: We should audit the session creation and what this function | |
2554 | * does "extra" in order to avoid a destroy since this function is used | |
2555 | * in the domain session creation (kernel and ust) only. Same for UST | |
2556 | * domain. | |
2557 | */ | |
2558 | if (session->kernel_session->consumer) { | |
6addfa37 | 2559 | consumer_output_put(session->kernel_session->consumer); |
09a90bcd | 2560 | } |
2f77fc4b DG |
2561 | session->kernel_session->consumer = |
2562 | consumer_copy_output(session->consumer); | |
2563 | /* Ease our life a bit for the next part */ | |
2564 | consumer = session->kernel_session->consumer; | |
2565 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2566 | break; |
f20baf8e | 2567 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2568 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2569 | case LTTNG_DOMAIN_PYTHON: |
b551a063 | 2570 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2571 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd | 2572 | if (session->ust_session->consumer) { |
6addfa37 | 2573 | consumer_output_put(session->ust_session->consumer); |
09a90bcd | 2574 | } |
2f77fc4b DG |
2575 | session->ust_session->consumer = |
2576 | consumer_copy_output(session->consumer); | |
2577 | /* Ease our life a bit for the next part */ | |
2578 | consumer = session->ust_session->consumer; | |
2579 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2580 | break; |
2581 | default: | |
f73fabfd | 2582 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2583 | goto error; |
2584 | } | |
2585 | ||
2f77fc4b | 2586 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2587 | strncat(consumer->subdir, dir_name, |
2588 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2589 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2590 | ||
f73fabfd | 2591 | ret = LTTNG_OK; |
54d01ffb DG |
2592 | |
2593 | error: | |
2594 | return ret; | |
2595 | } | |
2596 | ||
00e2e675 | 2597 | /* |
2f77fc4b | 2598 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2599 | * |
2600 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2601 | */ |
2f77fc4b DG |
2602 | static int create_ust_session(struct ltt_session *session, |
2603 | struct lttng_domain *domain) | |
00e2e675 DG |
2604 | { |
2605 | int ret; | |
2f77fc4b | 2606 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2607 | |
a4b92340 | 2608 | assert(session); |
2f77fc4b DG |
2609 | assert(domain); |
2610 | assert(session->consumer); | |
a4b92340 | 2611 | |
2f77fc4b | 2612 | switch (domain->type) { |
f20baf8e | 2613 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2614 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2615 | case LTTNG_DOMAIN_PYTHON: |
2f77fc4b DG |
2616 | case LTTNG_DOMAIN_UST: |
2617 | break; | |
2618 | default: | |
2619 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2620 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2621 | goto error; |
2622 | } | |
2623 | ||
2f77fc4b DG |
2624 | DBG("Creating UST session"); |
2625 | ||
dec56f6c | 2626 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2627 | if (lus == NULL) { |
f73fabfd | 2628 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2629 | goto error; |
2630 | } | |
2631 | ||
2f77fc4b DG |
2632 | lus->uid = session->uid; |
2633 | lus->gid = session->gid; | |
2bba9e53 | 2634 | lus->output_traces = session->output_traces; |
27babd3a | 2635 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2636 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2637 | session->ust_session = lus; |
d7ba1388 | 2638 | if (session->shm_path[0]) { |
3d071855 MD |
2639 | strncpy(lus->root_shm_path, session->shm_path, |
2640 | sizeof(lus->root_shm_path)); | |
2641 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2642 | strncpy(lus->shm_path, session->shm_path, |
2643 | sizeof(lus->shm_path)); | |
2644 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
2645 | strncat(lus->shm_path, "/ust", | |
2646 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
2647 | } | |
2f77fc4b DG |
2648 | /* Copy session output to the newly created UST session */ |
2649 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2650 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2651 | goto error; |
2652 | } | |
2653 | ||
f73fabfd | 2654 | return LTTNG_OK; |
00e2e675 DG |
2655 | |
2656 | error: | |
2f77fc4b DG |
2657 | free(lus); |
2658 | session->ust_session = NULL; | |
00e2e675 DG |
2659 | return ret; |
2660 | } | |
2661 | ||
2662 | /* | |
2f77fc4b | 2663 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2664 | */ |
2f77fc4b | 2665 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2666 | { |
2667 | int ret; | |
a4b92340 | 2668 | |
2f77fc4b | 2669 | DBG("Creating kernel session"); |
00e2e675 | 2670 | |
2f77fc4b DG |
2671 | ret = kernel_create_session(session, kernel_tracer_fd); |
2672 | if (ret < 0) { | |
f73fabfd | 2673 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2674 | goto error; |
2675 | } | |
2676 | ||
2f77fc4b DG |
2677 | /* Code flow safety */ |
2678 | assert(session->kernel_session); | |
2679 | ||
2680 | /* Copy session output to the newly created Kernel session */ | |
2681 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2682 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2683 | goto error; |
2684 | } | |
2685 | ||
2f77fc4b DG |
2686 | session->kernel_session->uid = session->uid; |
2687 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2688 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2689 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2690 | |
f73fabfd | 2691 | return LTTNG_OK; |
00e2e675 | 2692 | |
2f77fc4b DG |
2693 | error: |
2694 | trace_kernel_destroy_session(session->kernel_session); | |
2695 | session->kernel_session = NULL; | |
2696 | return ret; | |
2697 | } | |
00e2e675 | 2698 | |
2f77fc4b DG |
2699 | /* |
2700 | * Count number of session permitted by uid/gid. | |
2701 | */ | |
2702 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2703 | { | |
2704 | unsigned int i = 0; | |
2705 | struct ltt_session *session; | |
e32d7f27 | 2706 | const struct ltt_session_list *session_list = session_get_list(); |
07424f16 | 2707 | |
2f77fc4b DG |
2708 | DBG("Counting number of available session for UID %d GID %d", |
2709 | uid, gid); | |
e32d7f27 JG |
2710 | cds_list_for_each_entry(session, &session_list->head, list) { |
2711 | if (!session_get(session)) { | |
2f77fc4b DG |
2712 | continue; |
2713 | } | |
e32d7f27 JG |
2714 | session_lock(session); |
2715 | /* Only count the sessions the user can control. */ | |
2716 | if (session_access_ok(session, uid, gid) && | |
2717 | !session->destroyed) { | |
2718 | i++; | |
2719 | } | |
2720 | session_unlock(session); | |
2721 | session_put(session); | |
a4b92340 | 2722 | } |
2f77fc4b | 2723 | return i; |
00e2e675 DG |
2724 | } |
2725 | ||
dcabc190 FD |
2726 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, |
2727 | int *sock_error, struct lttng_event *event) | |
2728 | { | |
2729 | int fd, ret; | |
2730 | struct lttng_userspace_probe_location *probe_location; | |
87597c2c | 2731 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
dcabc190 FD |
2732 | struct lttng_dynamic_buffer probe_location_buffer; |
2733 | struct lttng_buffer_view buffer_view; | |
2734 | ||
2735 | /* | |
2736 | * Create a buffer to store the serialized version of the probe | |
2737 | * location. | |
2738 | */ | |
2739 | lttng_dynamic_buffer_init(&probe_location_buffer); | |
2740 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, | |
2741 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); | |
2742 | if (ret) { | |
2743 | ret = LTTNG_ERR_NOMEM; | |
2744 | goto error; | |
2745 | } | |
2746 | ||
2747 | /* | |
2748 | * Receive the probe location. | |
2749 | */ | |
2750 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, | |
2751 | probe_location_buffer.size); | |
2752 | if (ret <= 0) { | |
2753 | DBG("Nothing recv() from client var len data... continuing"); | |
2754 | *sock_error = 1; | |
2755 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
2756 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2757 | goto error; | |
2758 | } | |
2759 | ||
2760 | buffer_view = lttng_buffer_view_from_dynamic_buffer( | |
2761 | &probe_location_buffer, 0, probe_location_buffer.size); | |
2762 | ||
2763 | /* | |
2764 | * Extract the probe location from the serialized version. | |
2765 | */ | |
2766 | ret = lttng_userspace_probe_location_create_from_buffer( | |
2767 | &buffer_view, &probe_location); | |
2768 | if (ret < 0) { | |
2769 | WARN("Failed to create a userspace probe location from the received buffer"); | |
2770 | lttng_dynamic_buffer_reset( &probe_location_buffer); | |
2771 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2772 | goto error; | |
2773 | } | |
2774 | ||
2775 | /* | |
2776 | * Receive the file descriptor to the target binary from the client. | |
2777 | */ | |
2778 | DBG("Receiving userspace probe target FD from client ..."); | |
2779 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
2780 | if (ret <= 0) { | |
2781 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
2782 | *sock_error = 1; | |
2783 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2784 | goto error; | |
2785 | } | |
2786 | ||
2787 | /* | |
2788 | * Set the file descriptor received from the client through the unix | |
2789 | * socket in the probe location. | |
2790 | */ | |
2791 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
2792 | if (!lookup) { | |
2793 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2794 | goto error; | |
2795 | } | |
2796 | ||
2797 | /* | |
2798 | * From the kernel tracer's perspective, all userspace probe event types | |
2799 | * are all the same: a file and an offset. | |
2800 | */ | |
2801 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { | |
2802 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
2803 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
2804 | probe_location, fd); | |
2805 | break; | |
2806 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
2807 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
2808 | probe_location, fd); | |
2809 | break; | |
2810 | default: | |
2811 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2812 | goto error; | |
2813 | } | |
2814 | ||
2815 | if (ret) { | |
2816 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2817 | goto error; | |
2818 | } | |
2819 | ||
2820 | /* Attach the probe location to the event. */ | |
2821 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
2822 | if (ret) { | |
2823 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
2824 | goto error; | |
2825 | } | |
2826 | ||
2827 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
2828 | error: | |
2829 | return ret; | |
2830 | } | |
2831 | ||
5c408ad8 JD |
2832 | /* |
2833 | * Check if the current kernel tracer supports the session rotation feature. | |
2834 | * Return 1 if it does, 0 otherwise. | |
2835 | */ | |
2836 | static int check_rotate_compatible(void) | |
2837 | { | |
2838 | int ret = 1; | |
2839 | ||
2840 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
2841 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
2842 | ret = 0; | |
2843 | } | |
2844 | ||
2845 | return ret; | |
2846 | } | |
2847 | ||
54d01ffb DG |
2848 | /* |
2849 | * Process the command requested by the lttng client within the command | |
2850 | * context structure. This function make sure that the return structure (llm) | |
2851 | * is set and ready for transmission before returning. | |
2852 | * | |
2853 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2854 | * |
2855 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2856 | * |
2857 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2858 | */ |
53a80697 MD |
2859 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2860 | int *sock_error) | |
54d01ffb | 2861 | { |
f73fabfd | 2862 | int ret = LTTNG_OK; |
44d3bd01 | 2863 | int need_tracing_session = 1; |
2e09ba09 | 2864 | int need_domain; |
54d01ffb DG |
2865 | |
2866 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2867 | ||
3745d315 MD |
2868 | assert(!rcu_read_ongoing()); |
2869 | ||
53a80697 MD |
2870 | *sock_error = 0; |
2871 | ||
2e09ba09 MD |
2872 | switch (cmd_ctx->lsm->cmd_type) { |
2873 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2874 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2875 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
2876 | case LTTNG_DESTROY_SESSION: |
2877 | case LTTNG_LIST_SESSIONS: | |
2878 | case LTTNG_LIST_DOMAINS: | |
2879 | case LTTNG_START_TRACE: | |
2880 | case LTTNG_STOP_TRACE: | |
6d805429 | 2881 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2882 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2883 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2884 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2885 | case LTTNG_SNAPSHOT_RECORD: | |
fb198a11 | 2886 | case LTTNG_SAVE_SESSION: |
d7ba1388 | 2887 | case LTTNG_SET_SESSION_SHM_PATH: |
eded6438 | 2888 | case LTTNG_REGENERATE_METADATA: |
c2561365 | 2889 | case LTTNG_REGENERATE_STATEDUMP: |
b3530820 JG |
2890 | case LTTNG_REGISTER_TRIGGER: |
2891 | case LTTNG_UNREGISTER_TRIGGER: | |
5c408ad8 | 2892 | case LTTNG_ROTATE_SESSION: |
d68c9a04 | 2893 | case LTTNG_ROTATION_GET_INFO: |
259c2674 | 2894 | case LTTNG_ROTATION_SET_SCHEDULE: |
66ea93b1 | 2895 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
2e09ba09 | 2896 | need_domain = 0; |
3aace903 | 2897 | break; |
2e09ba09 MD |
2898 | default: |
2899 | need_domain = 1; | |
2900 | } | |
2901 | ||
e6142f2e | 2902 | if (config.no_kernel && need_domain |
2e09ba09 | 2903 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
531d29f9 | 2904 | if (!is_root) { |
f73fabfd | 2905 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2906 | } else { |
f73fabfd | 2907 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2908 | } |
4fba7219 DG |
2909 | goto error; |
2910 | } | |
2911 | ||
8d3113b2 DG |
2912 | /* Deny register consumer if we already have a spawned consumer. */ |
2913 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2914 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2915 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2916 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2917 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2918 | goto error; |
2919 | } | |
2920 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2921 | } | |
2922 | ||
54d01ffb DG |
2923 | /* |
2924 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2925 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2926 | * command. |
2927 | */ | |
2928 | switch(cmd_ctx->lsm->cmd_type) { | |
2929 | case LTTNG_LIST_SESSIONS: | |
2930 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2931 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2932 | case LTTNG_LIST_DOMAINS: |
2933 | case LTTNG_LIST_CHANNELS: | |
2934 | case LTTNG_LIST_EVENTS: | |
834978fd | 2935 | case LTTNG_LIST_SYSCALLS: |
a5dfbb9d | 2936 | case LTTNG_LIST_TRACKER_PIDS: |
5cd0780d | 2937 | case LTTNG_DATA_PENDING: |
5c408ad8 | 2938 | case LTTNG_ROTATE_SESSION: |
d68c9a04 | 2939 | case LTTNG_ROTATION_GET_INFO: |
66ea93b1 | 2940 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
54d01ffb DG |
2941 | break; |
2942 | default: | |
2943 | /* Setup lttng message with no payload */ | |
6e10c9b9 | 2944 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
54d01ffb DG |
2945 | if (ret < 0) { |
2946 | /* This label does not try to unlock the session */ | |
2947 | goto init_setup_error; | |
2948 | } | |
2949 | } | |
2950 | ||
2951 | /* Commands that DO NOT need a session. */ | |
2952 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2953 | case LTTNG_CREATE_SESSION: |
27babd3a | 2954 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2955 | case LTTNG_CREATE_SESSION_LIVE: |
54d01ffb DG |
2956 | case LTTNG_LIST_SESSIONS: |
2957 | case LTTNG_LIST_TRACEPOINTS: | |
834978fd | 2958 | case LTTNG_LIST_SYSCALLS: |
f37d259d | 2959 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
fb198a11 | 2960 | case LTTNG_SAVE_SESSION: |
b3530820 JG |
2961 | case LTTNG_REGISTER_TRIGGER: |
2962 | case LTTNG_UNREGISTER_TRIGGER: | |
44d3bd01 | 2963 | need_tracing_session = 0; |
54d01ffb DG |
2964 | break; |
2965 | default: | |
2966 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2967 | /* |
2968 | * We keep the session list lock across _all_ commands | |
2969 | * for now, because the per-session lock does not | |
2970 | * handle teardown properly. | |
2971 | */ | |
74babd95 | 2972 | session_lock_list(); |
54d01ffb DG |
2973 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2974 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2975 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2976 | goto error; |
2977 | } else { | |
2978 | /* Acquire lock for the session */ | |
2979 | session_lock(cmd_ctx->session); | |
2980 | } | |
2981 | break; | |
2982 | } | |
b389abbe | 2983 | |
5f3ecf22 DG |
2984 | /* |
2985 | * Commands that need a valid session but should NOT create one if none | |
2986 | * exists. Instead of creating one and destroying it when the command is | |
2987 | * handled, process that right before so we save some round trip in useless | |
2988 | * code path. | |
2989 | */ | |
2990 | switch (cmd_ctx->lsm->cmd_type) { | |
2991 | case LTTNG_DISABLE_CHANNEL: | |
2992 | case LTTNG_DISABLE_EVENT: | |
5f3ecf22 DG |
2993 | switch (cmd_ctx->lsm->domain.type) { |
2994 | case LTTNG_DOMAIN_KERNEL: | |
2995 | if (!cmd_ctx->session->kernel_session) { | |
2996 | ret = LTTNG_ERR_NO_CHANNEL; | |
2997 | goto error; | |
2998 | } | |
2999 | break; | |
3000 | case LTTNG_DOMAIN_JUL: | |
5cdb6027 | 3001 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3002 | case LTTNG_DOMAIN_PYTHON: |
5f3ecf22 DG |
3003 | case LTTNG_DOMAIN_UST: |
3004 | if (!cmd_ctx->session->ust_session) { | |
3005 | ret = LTTNG_ERR_NO_CHANNEL; | |
3006 | goto error; | |
3007 | } | |
3008 | break; | |
3009 | default: | |
3010 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3011 | goto error; | |
3012 | } | |
3013 | default: | |
3014 | break; | |
3015 | } | |
3016 | ||
2e09ba09 MD |
3017 | if (!need_domain) { |
3018 | goto skip_domain; | |
3019 | } | |
a4b92340 | 3020 | |
54d01ffb DG |
3021 | /* |
3022 | * Check domain type for specific "pre-action". | |
3023 | */ | |
3024 | switch (cmd_ctx->lsm->domain.type) { | |
3025 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3026 | if (!is_root) { |
f73fabfd | 3027 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3028 | goto error; |
3029 | } | |
3030 | ||
54d01ffb | 3031 | /* Kernel tracer check */ |
a4b35e07 | 3032 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3033 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3034 | ret = init_kernel_tracer(); |
3035 | if (ret != 0) { | |
54d01ffb DG |
3036 | goto error; |
3037 | } | |
3038 | } | |
5eb91c98 | 3039 | |
5c827ce0 DG |
3040 | /* Consumer is in an ERROR state. Report back to client */ |
3041 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3042 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3043 | goto error; |
3044 | } | |
3045 | ||
54d01ffb | 3046 | /* Need a session for kernel command */ |
44d3bd01 | 3047 | if (need_tracing_session) { |
54d01ffb | 3048 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3049 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3050 | if (ret < 0) { |
f73fabfd | 3051 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
3052 | goto error; |
3053 | } | |
b389abbe | 3054 | } |
7d29a247 | 3055 | |
54d01ffb | 3056 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3057 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3058 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 3059 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3060 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3061 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3062 | if (ret < 0) { |
f73fabfd | 3063 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 3064 | goto error; |
950131af | 3065 | } |
5c827ce0 | 3066 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3067 | } else { |
3068 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3069 | } |
173af62f | 3070 | |
a4b92340 DG |
3071 | /* |
3072 | * The consumer was just spawned so we need to add the socket to | |
3073 | * the consumer output of the session if exist. | |
3074 | */ | |
3075 | ret = consumer_create_socket(&kconsumer_data, | |
3076 | cmd_ctx->session->kernel_session->consumer); | |
3077 | if (ret < 0) { | |
3078 | goto error; | |
173af62f | 3079 | } |
0d0c377a | 3080 | } |
5c827ce0 | 3081 | |
54d01ffb | 3082 | break; |
b9dfb167 | 3083 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3084 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3085 | case LTTNG_DOMAIN_PYTHON: |
2bdd86d4 | 3086 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3087 | { |
b51ec5b4 MD |
3088 | if (!ust_app_supported()) { |
3089 | ret = LTTNG_ERR_NO_UST; | |
3090 | goto error; | |
3091 | } | |
5c827ce0 DG |
3092 | /* Consumer is in an ERROR state. Report back to client */ |
3093 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3094 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3095 | goto error; |
3096 | } | |
3097 | ||
44d3bd01 | 3098 | if (need_tracing_session) { |
a4b92340 | 3099 | /* Create UST session if none exist. */ |
f6a9efaa | 3100 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3101 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3102 | &cmd_ctx->lsm->domain); |
f73fabfd | 3103 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
3104 | goto error; |
3105 | } | |
3106 | } | |
00e2e675 | 3107 | |
7753dea8 MD |
3108 | /* Start the UST consumer daemons */ |
3109 | /* 64-bit */ | |
3110 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
e6142f2e | 3111 | if (config.consumerd64_bin_path.value && |
7753dea8 | 3112 | ustconsumer64_data.pid == 0 && |
785d2d0d | 3113 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3114 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3115 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3116 | if (ret < 0) { |
f73fabfd | 3117 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 3118 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
3119 | goto error; |
3120 | } | |
48842b30 | 3121 | |
173af62f | 3122 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 3123 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3124 | } else { |
7753dea8 MD |
3125 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3126 | } | |
173af62f DG |
3127 | |
3128 | /* | |
3129 | * Setup socket for consumer 64 bit. No need for atomic access | |
3130 | * since it was set above and can ONLY be set in this thread. | |
3131 | */ | |
a4b92340 DG |
3132 | ret = consumer_create_socket(&ustconsumer64_data, |
3133 | cmd_ctx->session->ust_session->consumer); | |
3134 | if (ret < 0) { | |
3135 | goto error; | |
173af62f DG |
3136 | } |
3137 | ||
7753dea8 | 3138 | /* 32-bit */ |
385b881b | 3139 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
e6142f2e | 3140 | if (config.consumerd32_bin_path.value && |
7753dea8 | 3141 | ustconsumer32_data.pid == 0 && |
785d2d0d | 3142 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3143 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
3144 | ret = start_consumerd(&ustconsumer32_data); | |
3145 | if (ret < 0) { | |
f73fabfd | 3146 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 3147 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
3148 | goto error; |
3149 | } | |
5c827ce0 | 3150 | |
173af62f | 3151 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 3152 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3153 | } else { |
3154 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3155 | } |
173af62f DG |
3156 | |
3157 | /* | |
92816cc3 | 3158 | * Setup socket for consumer 32 bit. No need for atomic access |
173af62f DG |
3159 | * since it was set above and can ONLY be set in this thread. |
3160 | */ | |
a4b92340 DG |
3161 | ret = consumer_create_socket(&ustconsumer32_data, |
3162 | cmd_ctx->session->ust_session->consumer); | |
3163 | if (ret < 0) { | |
3164 | goto error; | |
173af62f | 3165 | } |
44d3bd01 DG |
3166 | } |
3167 | break; | |
48842b30 | 3168 | } |
54d01ffb | 3169 | default: |
54d01ffb DG |
3170 | break; |
3171 | } | |
2e09ba09 | 3172 | skip_domain: |
33a2b854 | 3173 | |
5c827ce0 DG |
3174 | /* Validate consumer daemon state when start/stop trace command */ |
3175 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3176 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3177 | switch (cmd_ctx->lsm->domain.type) { | |
e7619875 JG |
3178 | case LTTNG_DOMAIN_NONE: |
3179 | break; | |
b9dfb167 | 3180 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3181 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3182 | case LTTNG_DOMAIN_PYTHON: |
5c827ce0 DG |
3183 | case LTTNG_DOMAIN_UST: |
3184 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3185 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3186 | goto error; |
3187 | } | |
3188 | break; | |
3189 | case LTTNG_DOMAIN_KERNEL: | |
3190 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3191 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3192 | goto error; |
3193 | } | |
3194 | break; | |
825535cc JG |
3195 | default: |
3196 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3197 | goto error; | |
5c827ce0 DG |
3198 | } |
3199 | } | |
3200 | ||
8e0af1b4 MD |
3201 | /* |
3202 | * Check that the UID or GID match that of the tracing session. | |
3203 | * The root user can interact with all sessions. | |
3204 | */ | |
3205 | if (need_tracing_session) { | |
3206 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 | 3207 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
e32d7f27 JG |
3208 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || |
3209 | cmd_ctx->session->destroyed) { | |
f73fabfd | 3210 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
3211 | goto error; |
3212 | } | |
3213 | } | |
3214 | ||
ffe60014 DG |
3215 | /* |
3216 | * Send relayd information to consumer as soon as we have a domain and a | |
3217 | * session defined. | |
3218 | */ | |
3219 | if (cmd_ctx->session && need_domain) { | |
3220 | /* | |
3221 | * Setup relayd if not done yet. If the relayd information was already | |
3222 | * sent to the consumer, this call will gracefully return. | |
3223 | */ | |
3224 | ret = cmd_setup_relayd(cmd_ctx->session); | |
3225 | if (ret != LTTNG_OK) { | |
3226 | goto error; | |
3227 | } | |
3228 | } | |
3229 | ||
54d01ffb DG |
3230 | /* Process by command type */ |
3231 | switch (cmd_ctx->lsm->cmd_type) { | |
3232 | case LTTNG_ADD_CONTEXT: | |
3233 | { | |
2001793c JG |
3234 | /* |
3235 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
3236 | * payload if the context being added is an application context. | |
3237 | */ | |
3238 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
3239 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
3240 | char *provider_name = NULL, *context_name = NULL; | |
3241 | size_t provider_name_len = | |
3242 | cmd_ctx->lsm->u.context.provider_name_len; | |
3243 | size_t context_name_len = | |
3244 | cmd_ctx->lsm->u.context.context_name_len; | |
3245 | ||
3246 | if (provider_name_len == 0 || context_name_len == 0) { | |
3247 | /* | |
3248 | * Application provider and context names MUST | |
3249 | * be provided. | |
3250 | */ | |
3251 | ret = -LTTNG_ERR_INVALID; | |
3252 | goto error; | |
3253 | } | |
3254 | ||
3255 | provider_name = zmalloc(provider_name_len + 1); | |
3256 | if (!provider_name) { | |
3257 | ret = -LTTNG_ERR_NOMEM; | |
3258 | goto error; | |
3259 | } | |
e0f4d107 JG |
3260 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
3261 | provider_name; | |
2001793c JG |
3262 | |
3263 | context_name = zmalloc(context_name_len + 1); | |
3264 | if (!context_name) { | |
3265 | ret = -LTTNG_ERR_NOMEM; | |
3266 | goto error_add_context; | |
3267 | } | |
e0f4d107 JG |
3268 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
3269 | context_name; | |
2001793c JG |
3270 | |
3271 | ret = lttcomm_recv_unix_sock(sock, provider_name, | |
3272 | provider_name_len); | |
3273 | if (ret < 0) { | |
3274 | goto error_add_context; | |
3275 | } | |
3276 | ||
3277 | ret = lttcomm_recv_unix_sock(sock, context_name, | |
3278 | context_name_len); | |
3279 | if (ret < 0) { | |
3280 | goto error_add_context; | |
3281 | } | |
2001793c JG |
3282 | } |
3283 | ||
3284 | /* | |
3285 | * cmd_add_context assumes ownership of the provider and context | |
3286 | * names. | |
3287 | */ | |
3288 | ret = cmd_add_context(cmd_ctx->session, | |
3289 | cmd_ctx->lsm->domain.type, | |
54d01ffb | 3290 | cmd_ctx->lsm->u.context.channel_name, |
2001793c JG |
3291 | &cmd_ctx->lsm->u.context.ctx, |
3292 | kernel_poll_pipe[1]); | |
3293 | ||
3294 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
3295 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
3296 | error_add_context: | |
3297 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
3298 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
3299 | if (ret < 0) { | |
3300 | goto error; | |
3301 | } | |
54d01ffb DG |
3302 | break; |
3303 | } | |
3304 | case LTTNG_DISABLE_CHANNEL: | |
3305 | { | |
3306 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3307 | cmd_ctx->lsm->u.disable.channel_name); | |
3308 | break; | |
3309 | } | |
3310 | case LTTNG_DISABLE_EVENT: | |
3311 | { | |
47b7e2f9 JG |
3312 | |
3313 | /* | |
3314 | * FIXME: handle filter; for now we just receive the filter's | |
3315 | * bytecode along with the filter expression which are sent by | |
3316 | * liblttng-ctl and discard them. | |
3317 | * | |
3318 | * This fixes an issue where the client may block while sending | |
3319 | * the filter payload and encounter an error because the session | |
3320 | * daemon closes the socket without ever handling this data. | |
3321 | */ | |
3322 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
3323 | cmd_ctx->lsm->u.disable.bytecode_len; | |
3324 | ||
3325 | if (count) { | |
3326 | char data[LTTNG_FILTER_MAX_LEN]; | |
3327 | ||
3328 | DBG("Discarding disable event command payload of size %zu", count); | |
3329 | while (count) { | |
3330 | ret = lttcomm_recv_unix_sock(sock, data, | |
3331 | count > sizeof(data) ? sizeof(data) : count); | |
3332 | if (ret < 0) { | |
3333 | goto error; | |
3334 | } | |
3335 | ||
3336 | count -= (size_t) ret; | |
3337 | } | |
3338 | } | |
6e911cad | 3339 | /* FIXME: passing packed structure to non-packed pointer */ |
54d01ffb DG |
3340 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3341 | cmd_ctx->lsm->u.disable.channel_name, | |
6e911cad | 3342 | &cmd_ctx->lsm->u.disable.event); |
33a2b854 DG |
3343 | break; |
3344 | } | |
54d01ffb DG |
3345 | case LTTNG_ENABLE_CHANNEL: |
3346 | { | |
b3530820 JG |
3347 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = |
3348 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
7972aab2 | 3349 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
b3530820 JG |
3350 | &cmd_ctx->lsm->u.channel.chan, |
3351 | kernel_poll_pipe[1]); | |
54d01ffb DG |
3352 | break; |
3353 | } | |
ccf10263 MD |
3354 | case LTTNG_TRACK_PID: |
3355 | { | |
3356 | ret = cmd_track_pid(cmd_ctx->session, | |
3357 | cmd_ctx->lsm->domain.type, | |
3358 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3359 | break; | |
3360 | } | |
3361 | case LTTNG_UNTRACK_PID: | |
3362 | { | |
3363 | ret = cmd_untrack_pid(cmd_ctx->session, | |
3364 | cmd_ctx->lsm->domain.type, | |
3365 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3366 | break; | |
3367 | } | |
54d01ffb DG |
3368 | case LTTNG_ENABLE_EVENT: |
3369 | { | |
dcabc190 | 3370 | struct lttng_event *ev = NULL; |
882ef835 JI |
3371 | struct lttng_event_exclusion *exclusion = NULL; |
3372 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3373 | char *filter_expression = NULL; |
882ef835 | 3374 | |
67676bd8 DG |
3375 | /* Handle exclusion events and receive it from the client. */ |
3376 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3377 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3378 | ||
3379 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3380 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3381 | if (!exclusion) { | |
3382 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3383 | goto error; | |
882ef835 | 3384 | } |
882ef835 | 3385 | |
67676bd8 DG |
3386 | DBG("Receiving var len exclusion event list from client ..."); |
3387 | exclusion->count = count; | |
3388 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3389 | count * LTTNG_SYMBOL_NAME_LEN); | |
3390 | if (ret <= 0) { | |
3391 | DBG("Nothing recv() from client var len data... continuing"); | |
3392 | *sock_error = 1; | |
3393 | free(exclusion); | |
3394 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3395 | goto error; | |
3396 | } | |
3397 | } | |
3398 | ||
6b453b5e JG |
3399 | /* Get filter expression from client. */ |
3400 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3401 | size_t expression_len = | |
3402 | cmd_ctx->lsm->u.enable.expression_len; | |
3403 | ||
3404 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3405 | ret = LTTNG_ERR_FILTER_INVAL; | |
3406 | free(exclusion); | |
3407 | goto error; | |
3408 | } | |
3409 | ||
3410 | filter_expression = zmalloc(expression_len); | |
3411 | if (!filter_expression) { | |
3412 | free(exclusion); | |
3413 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3414 | goto error; | |
3415 | } | |
3416 | ||
3417 | /* Receive var. len. data */ | |
3418 | DBG("Receiving var len filter's expression from client ..."); | |
3419 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3420 | expression_len); | |
3421 | if (ret <= 0) { | |
dcabc190 | 3422 | DBG("Nothing recv() from client var len data... continuing"); |
6b453b5e JG |
3423 | *sock_error = 1; |
3424 | free(filter_expression); | |
3425 | free(exclusion); | |
3426 | ret = LTTNG_ERR_FILTER_INVAL; | |
3427 | goto error; | |
3428 | } | |
3429 | } | |
3430 | ||
67676bd8 DG |
3431 | /* Handle filter and get bytecode from client. */ |
3432 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3433 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3434 | ||
3435 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3436 | ret = LTTNG_ERR_FILTER_INVAL; | |
49d21f93 | 3437 | free(filter_expression); |
67676bd8 DG |
3438 | free(exclusion); |
3439 | goto error; | |
3440 | } | |
3441 | ||
3442 | bytecode = zmalloc(bytecode_len); | |
3443 | if (!bytecode) { | |
49d21f93 | 3444 | free(filter_expression); |
67676bd8 DG |
3445 | free(exclusion); |
3446 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3447 | goto error; | |
882ef835 JI |
3448 | } |
3449 | ||
67676bd8 DG |
3450 | /* Receive var. len. data */ |
3451 | DBG("Receiving var len filter's bytecode from client ..."); | |
3452 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3453 | if (ret <= 0) { | |
dcabc190 | 3454 | DBG("Nothing recv() from client var len data... continuing"); |
67676bd8 | 3455 | *sock_error = 1; |
49d21f93 | 3456 | free(filter_expression); |
67676bd8 DG |
3457 | free(bytecode); |
3458 | free(exclusion); | |
3459 | ret = LTTNG_ERR_FILTER_INVAL; | |
3460 | goto error; | |
3461 | } | |
3462 | ||
3463 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
49d21f93 | 3464 | free(filter_expression); |
67676bd8 DG |
3465 | free(bytecode); |
3466 | free(exclusion); | |
3467 | ret = LTTNG_ERR_FILTER_INVAL; | |
3468 | goto error; | |
3469 | } | |
882ef835 | 3470 | } |
67676bd8 | 3471 | |
dcabc190 FD |
3472 | ev = lttng_event_copy(&cmd_ctx->lsm->u.enable.event); |
3473 | if (!ev) { | |
3474 | DBG("Failed to copy event: %s", | |
3475 | cmd_ctx->lsm->u.enable.event.name); | |
5ae0c80e JG |
3476 | free(filter_expression); |
3477 | free(bytecode); | |
3478 | free(exclusion); | |
dcabc190 FD |
3479 | ret = LTTNG_ERR_NOMEM; |
3480 | goto error; | |
3481 | } | |
3482 | ||
3483 | ||
3484 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { | |
3485 | /* Expect a userspace probe description. */ | |
3486 | ret = receive_userspace_probe(cmd_ctx, sock, sock_error, ev); | |
3487 | if (ret) { | |
5ae0c80e JG |
3488 | free(filter_expression); |
3489 | free(bytecode); | |
3490 | free(exclusion); | |
dcabc190 FD |
3491 | lttng_event_destroy(ev); |
3492 | goto error; | |
3493 | } | |
3494 | } | |
3495 | ||
67676bd8 DG |
3496 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
3497 | cmd_ctx->lsm->u.enable.channel_name, | |
dcabc190 | 3498 | ev, |
6b453b5e | 3499 | filter_expression, bytecode, exclusion, |
67676bd8 | 3500 | kernel_poll_pipe[1]); |
dcabc190 | 3501 | lttng_event_destroy(ev); |
54d01ffb DG |
3502 | break; |
3503 | } | |
052da939 | 3504 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3505 | { |
9f19cc17 | 3506 | struct lttng_event *events; |
54d01ffb | 3507 | ssize_t nb_events; |
052da939 | 3508 | |
0845bbfa | 3509 | session_lock_list(); |
54d01ffb | 3510 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
0845bbfa | 3511 | session_unlock_list(); |
54d01ffb | 3512 | if (nb_events < 0) { |
f73fabfd | 3513 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3514 | ret = -nb_events; |
3515 | goto error; | |
2ef84c95 DG |
3516 | } |
3517 | ||
3518 | /* | |
3519 | * Setup lttng message with payload size set to the event list size in | |
3520 | * bytes and then copy list into the llm payload. | |
3521 | */ | |
6e10c9b9 PP |
3522 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3523 | sizeof(struct lttng_event) * nb_events); | |
3524 | free(events); | |
3525 | ||
2ef84c95 DG |
3526 | if (ret < 0) { |
3527 | goto setup_error; | |
3528 | } | |
3529 | ||
f73fabfd | 3530 | ret = LTTNG_OK; |
2ef84c95 DG |
3531 | break; |
3532 | } | |
f37d259d MD |
3533 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3534 | { | |
3535 | struct lttng_event_field *fields; | |
3536 | ssize_t nb_fields; | |
3537 | ||
0845bbfa | 3538 | session_lock_list(); |
a4b92340 DG |
3539 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3540 | &fields); | |
0845bbfa | 3541 | session_unlock_list(); |
f37d259d | 3542 | if (nb_fields < 0) { |
f73fabfd | 3543 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3544 | ret = -nb_fields; |
3545 | goto error; | |
3546 | } | |
3547 | ||
3548 | /* | |
3549 | * Setup lttng message with payload size set to the event list size in | |
3550 | * bytes and then copy list into the llm payload. | |
3551 | */ | |
6e10c9b9 | 3552 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
a4b92340 | 3553 | sizeof(struct lttng_event_field) * nb_fields); |
6e10c9b9 PP |
3554 | free(fields); |
3555 | ||
f37d259d | 3556 | if (ret < 0) { |
f37d259d MD |
3557 | goto setup_error; |
3558 | } | |
3559 | ||
f73fabfd | 3560 | ret = LTTNG_OK; |
f37d259d MD |
3561 | break; |
3562 | } | |
834978fd DG |
3563 | case LTTNG_LIST_SYSCALLS: |
3564 | { | |
3565 | struct lttng_event *events; | |
3566 | ssize_t nb_events; | |
3567 | ||
3568 | nb_events = cmd_list_syscalls(&events); | |
3569 | if (nb_events < 0) { | |
3570 | /* Return value is a negative lttng_error_code. */ | |
3571 | ret = -nb_events; | |
3572 | goto error; | |
3573 | } | |
3574 | ||
3575 | /* | |
3576 | * Setup lttng message with payload size set to the event list size in | |
3577 | * bytes and then copy list into the llm payload. | |
3578 | */ | |
6e10c9b9 PP |
3579 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
3580 | sizeof(struct lttng_event) * nb_events); | |
3581 | free(events); | |
3582 | ||
834978fd | 3583 | if (ret < 0) { |
834978fd DG |
3584 | goto setup_error; |
3585 | } | |
3586 | ||
834978fd DG |
3587 | ret = LTTNG_OK; |
3588 | break; | |
3589 | } | |
a5dfbb9d MD |
3590 | case LTTNG_LIST_TRACKER_PIDS: |
3591 | { | |
3592 | int32_t *pids = NULL; | |
3593 | ssize_t nr_pids; | |
3594 | ||
3595 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
3596 | cmd_ctx->lsm->domain.type, &pids); | |
3597 | if (nr_pids < 0) { | |
3598 | /* Return value is a negative lttng_error_code. */ | |
3599 | ret = -nr_pids; | |
3600 | goto error; | |
3601 | } | |
3602 | ||
3603 | /* | |
3604 | * Setup lttng message with payload size set to the event list size in | |
3605 | * bytes and then copy list into the llm payload. | |
3606 | */ | |
6e10c9b9 PP |
3607 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, |
3608 | sizeof(int32_t) * nr_pids); | |
3609 | free(pids); | |
3610 | ||
a5dfbb9d | 3611 | if (ret < 0) { |
a5dfbb9d MD |
3612 | goto setup_error; |
3613 | } | |
3614 | ||
a5dfbb9d MD |
3615 | ret = LTTNG_OK; |
3616 | break; | |
3617 | } | |
00e2e675 DG |
3618 | case LTTNG_SET_CONSUMER_URI: |
3619 | { | |
a4b92340 DG |
3620 | size_t nb_uri, len; |
3621 | struct lttng_uri *uris; | |
3622 | ||
3623 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3624 | len = nb_uri * sizeof(struct lttng_uri); | |
3625 | ||
3626 | if (nb_uri == 0) { | |
f73fabfd | 3627 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3628 | goto error; |
3629 | } | |
3630 | ||
3631 | uris = zmalloc(len); | |
3632 | if (uris == NULL) { | |
f73fabfd | 3633 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3634 | goto error; |
3635 | } | |
3636 | ||
3637 | /* Receive variable len data */ | |
77c7c900 | 3638 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3639 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3640 | if (ret <= 0) { | |
3641 | DBG("No URIs received from client... continuing"); | |
3642 | *sock_error = 1; | |
f73fabfd | 3643 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3644 | free(uris); |
a4b92340 DG |
3645 | goto error; |
3646 | } | |
3647 | ||
bda32d56 JG |
3648 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
3649 | free(uris); | |
f73fabfd | 3650 | if (ret != LTTNG_OK) { |
a4b92340 DG |
3651 | goto error; |
3652 | } | |
3653 | ||
b1d41407 | 3654 | |
00e2e675 DG |
3655 | break; |
3656 | } | |
f3ed775e | 3657 | case LTTNG_START_TRACE: |
8c0faa1d | 3658 | { |
259c2674 JD |
3659 | /* |
3660 | * On the first start, if we have a kernel session and we have | |
3661 | * enabled time or size-based rotations, we have to make sure | |
3662 | * the kernel tracer supports it. | |
3663 | */ | |
3664 | if (!cmd_ctx->session->has_been_started && \ | |
3665 | cmd_ctx->session->kernel_session && \ | |
3666 | (cmd_ctx->session->rotate_timer_period || \ | |
3667 | cmd_ctx->session->rotate_size) && \ | |
3668 | !check_rotate_compatible()) { | |
3669 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
3670 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
3671 | goto error; | |
3672 | } | |
54d01ffb | 3673 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3674 | break; |
3675 | } | |
f3ed775e | 3676 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3677 | { |
54d01ffb | 3678 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3679 | break; |
3680 | } | |
5e16da05 MD |
3681 | case LTTNG_CREATE_SESSION: |
3682 | { | |
a4b92340 DG |
3683 | size_t nb_uri, len; |
3684 | struct lttng_uri *uris = NULL; | |
3685 | ||
3686 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3687 | len = nb_uri * sizeof(struct lttng_uri); | |
3688 | ||
3689 | if (nb_uri > 0) { | |
3690 | uris = zmalloc(len); | |
3691 | if (uris == NULL) { | |
f73fabfd | 3692 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3693 | goto error; |
3694 | } | |
3695 | ||
3696 | /* Receive variable len data */ | |
77c7c900 | 3697 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3698 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3699 | if (ret <= 0) { | |
3700 | DBG("No URIs received from client... continuing"); | |
3701 | *sock_error = 1; | |
f73fabfd | 3702 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3703 | free(uris); |
a4b92340 DG |
3704 | goto error; |
3705 | } | |
3706 | ||
3707 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3708 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3709 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3710 | free(uris); |
a4b92340 DG |
3711 | goto error; |
3712 | } | |
3713 | } | |
3714 | ||
3715 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3716 | &cmd_ctx->creds, 0); |
a4b92340 | 3717 | |
b1d41407 DG |
3718 | free(uris); |
3719 | ||
00e2e675 DG |
3720 | break; |
3721 | } | |
5e16da05 MD |
3722 | case LTTNG_DESTROY_SESSION: |
3723 | { | |
e32d7f27 | 3724 | ret = cmd_destroy_session(cmd_ctx->session, |
90936dcf | 3725 | notification_thread_handle); |
5461b305 | 3726 | break; |
5e16da05 | 3727 | } |
9f19cc17 | 3728 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3729 | { |
54d01ffb | 3730 | ssize_t nb_dom; |
fa64dfb4 | 3731 | struct lttng_domain *domains = NULL; |
5461b305 | 3732 | |
54d01ffb DG |
3733 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3734 | if (nb_dom < 0) { | |
f73fabfd | 3735 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3736 | ret = -nb_dom; |
3737 | goto error; | |
ce3d728c | 3738 | } |
520ff687 | 3739 | |
6e10c9b9 PP |
3740 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
3741 | nb_dom * sizeof(struct lttng_domain)); | |
3742 | free(domains); | |
3743 | ||
5461b305 DG |
3744 | if (ret < 0) { |
3745 | goto setup_error; | |
520ff687 | 3746 | } |
57167058 | 3747 | |
f73fabfd | 3748 | ret = LTTNG_OK; |
5e16da05 MD |
3749 | break; |
3750 | } | |
9f19cc17 | 3751 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3752 | { |
53e367f9 | 3753 | ssize_t payload_size; |
ade7ce52 | 3754 | struct lttng_channel *channels = NULL; |
54d01ffb | 3755 | |
53e367f9 | 3756 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
b551a063 | 3757 | cmd_ctx->session, &channels); |
53e367f9 | 3758 | if (payload_size < 0) { |
f73fabfd | 3759 | /* Return value is a negative lttng_error_code. */ |
53e367f9 | 3760 | ret = -payload_size; |
54d01ffb | 3761 | goto error; |
5461b305 | 3762 | } |
ca95a216 | 3763 | |
6e10c9b9 | 3764 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
53e367f9 | 3765 | payload_size); |
6e10c9b9 PP |
3766 | free(channels); |
3767 | ||
5461b305 DG |
3768 | if (ret < 0) { |
3769 | goto setup_error; | |
3770 | } | |
9f19cc17 | 3771 | |
f73fabfd | 3772 | ret = LTTNG_OK; |
5461b305 | 3773 | break; |
5e16da05 | 3774 | } |
9f19cc17 | 3775 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3776 | { |
b551a063 | 3777 | ssize_t nb_event; |
684d34d2 | 3778 | struct lttng_event *events = NULL; |
b4e3ceb9 PP |
3779 | struct lttcomm_event_command_header cmd_header; |
3780 | size_t total_size; | |
3781 | ||
b2d66287 | 3782 | memset(&cmd_header, 0, sizeof(cmd_header)); |
b4e3ceb9 PP |
3783 | /* Extended infos are included at the end of events */ |
3784 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
3785 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
3786 | &events, &total_size); | |
9f19cc17 | 3787 | |
54d01ffb | 3788 | if (nb_event < 0) { |
f73fabfd | 3789 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3790 | ret = -nb_event; |
3791 | goto error; | |
5461b305 | 3792 | } |
ca95a216 | 3793 | |
b4e3ceb9 PP |
3794 | cmd_header.nb_events = nb_event; |
3795 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
3796 | &cmd_header, sizeof(cmd_header)); | |
6e10c9b9 PP |
3797 | free(events); |
3798 | ||
5461b305 DG |
3799 | if (ret < 0) { |
3800 | goto setup_error; | |
3801 | } | |
9f19cc17 | 3802 | |
f73fabfd | 3803 | ret = LTTNG_OK; |
5461b305 | 3804 | break; |
5e16da05 MD |
3805 | } |
3806 | case LTTNG_LIST_SESSIONS: | |
3807 | { | |
8e0af1b4 | 3808 | unsigned int nr_sessions; |
6e10c9b9 PP |
3809 | void *sessions_payload; |
3810 | size_t payload_len; | |
5461b305 | 3811 | |
8e0af1b4 | 3812 | session_lock_list(); |
730389d9 DG |
3813 | nr_sessions = lttng_sessions_count( |
3814 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3815 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6e10c9b9 PP |
3816 | payload_len = sizeof(struct lttng_session) * nr_sessions; |
3817 | sessions_payload = zmalloc(payload_len); | |
d32fb093 | 3818 | |
6e10c9b9 | 3819 | if (!sessions_payload) { |
54d01ffb | 3820 | session_unlock_list(); |
6e10c9b9 | 3821 | ret = -ENOMEM; |
5461b305 | 3822 | goto setup_error; |
e065084a | 3823 | } |
5e16da05 | 3824 | |
6e10c9b9 | 3825 | cmd_list_lttng_sessions(sessions_payload, |
730389d9 DG |
3826 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3827 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
54d01ffb | 3828 | session_unlock_list(); |
5e16da05 | 3829 | |
6e10c9b9 PP |
3830 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
3831 | payload_len); | |
3832 | free(sessions_payload); | |
3833 | ||
3834 | if (ret < 0) { | |
3835 | goto setup_error; | |
3836 | } | |
3837 | ||
f73fabfd | 3838 | ret = LTTNG_OK; |
5e16da05 MD |
3839 | break; |
3840 | } | |
d9800920 DG |
3841 | case LTTNG_REGISTER_CONSUMER: |
3842 | { | |
2f77fc4b DG |
3843 | struct consumer_data *cdata; |
3844 | ||
3845 | switch (cmd_ctx->lsm->domain.type) { | |
3846 | case LTTNG_DOMAIN_KERNEL: | |
3847 | cdata = &kconsumer_data; | |
3848 | break; | |
3849 | default: | |
f73fabfd | 3850 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3851 | goto error; |
3852 | } | |
3853 | ||
54d01ffb | 3854 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3855 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3856 | break; |
3857 | } | |
6d805429 | 3858 | case LTTNG_DATA_PENDING: |
806e2684 | 3859 | { |
f6151c55 | 3860 | int pending_ret; |
6e10c9b9 | 3861 | uint8_t pending_ret_byte; |
f6151c55 JG |
3862 | |
3863 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
6e10c9b9 | 3864 | |
f6151c55 JG |
3865 | /* |
3866 | * FIXME | |
3867 | * | |
3868 | * This function may returns 0 or 1 to indicate whether or not | |
3869 | * there is data pending. In case of error, it should return an | |
3870 | * LTTNG_ERR code. However, some code paths may still return | |
3871 | * a nondescript error code, which we handle by returning an | |
3872 | * "unknown" error. | |
3873 | */ | |
3874 | if (pending_ret == 0 || pending_ret == 1) { | |
6e10c9b9 PP |
3875 | /* |
3876 | * ret will be set to LTTNG_OK at the end of | |
3877 | * this function. | |
3878 | */ | |
f6151c55 JG |
3879 | } else if (pending_ret < 0) { |
3880 | ret = LTTNG_ERR_UNK; | |
3881 | goto setup_error; | |
3882 | } else { | |
3883 | ret = pending_ret; | |
3884 | goto setup_error; | |
3885 | } | |
3886 | ||
6e10c9b9 PP |
3887 | pending_ret_byte = (uint8_t) pending_ret; |
3888 | ||
3889 | /* 1 byte to return whether or not data is pending */ | |
3890 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
3891 | &pending_ret_byte, 1); | |
3892 | ||
3893 | if (ret < 0) { | |
3894 | goto setup_error; | |
3895 | } | |
3896 | ||
3897 | ret = LTTNG_OK; | |
806e2684 DG |
3898 | break; |
3899 | } | |
da3c9ec1 DG |
3900 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3901 | { | |
6dc3064a DG |
3902 | struct lttcomm_lttng_output_id reply; |
3903 | ||
3904 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3905 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3906 | if (ret != LTTNG_OK) { | |
3907 | goto error; | |
3908 | } | |
3909 | ||
6e10c9b9 PP |
3910 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
3911 | sizeof(reply)); | |
6dc3064a DG |
3912 | if (ret < 0) { |
3913 | goto setup_error; | |
3914 | } | |
3915 | ||
3916 | /* Copy output list into message payload */ | |
6dc3064a | 3917 | ret = LTTNG_OK; |
da3c9ec1 DG |
3918 | break; |
3919 | } | |
3920 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3921 | { | |
6dc3064a DG |
3922 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3923 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3924 | break; |
3925 | } | |
3926 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3927 | { | |
6dc3064a DG |
3928 | ssize_t nb_output; |
3929 | struct lttng_snapshot_output *outputs = NULL; | |
3930 | ||
3931 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3932 | if (nb_output < 0) { | |
3933 | ret = -nb_output; | |
3934 | goto error; | |
3935 | } | |
3936 | ||
6e10c9b9 PP |
3937 | assert((nb_output > 0 && outputs) || nb_output == 0); |
3938 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
6dc3064a | 3939 | nb_output * sizeof(struct lttng_snapshot_output)); |
6e10c9b9 PP |
3940 | free(outputs); |
3941 | ||
6dc3064a | 3942 | if (ret < 0) { |
6dc3064a DG |
3943 | goto setup_error; |
3944 | } | |
3945 | ||
6dc3064a | 3946 | ret = LTTNG_OK; |
da3c9ec1 DG |
3947 | break; |
3948 | } | |
3949 | case LTTNG_SNAPSHOT_RECORD: | |
3950 | { | |
6dc3064a DG |
3951 | ret = cmd_snapshot_record(cmd_ctx->session, |
3952 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3953 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3954 | break; |
3955 | } | |
27babd3a DG |
3956 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3957 | { | |
3958 | size_t nb_uri, len; | |
3959 | struct lttng_uri *uris = NULL; | |
3960 | ||
3961 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3962 | len = nb_uri * sizeof(struct lttng_uri); | |
3963 | ||
3964 | if (nb_uri > 0) { | |
3965 | uris = zmalloc(len); | |
3966 | if (uris == NULL) { | |
3967 | ret = LTTNG_ERR_FATAL; | |
3968 | goto error; | |
3969 | } | |
3970 | ||
3971 | /* Receive variable len data */ | |
3972 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3973 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3974 | if (ret <= 0) { | |
3975 | DBG("No URIs received from client... continuing"); | |
3976 | *sock_error = 1; | |
3977 | ret = LTTNG_ERR_SESSION_FAIL; | |
3978 | free(uris); | |
3979 | goto error; | |
3980 | } | |
3981 | ||
3982 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3983 | DBG("Creating session with ONE network URI is a bad call"); | |
3984 | ret = LTTNG_ERR_SESSION_FAIL; | |
3985 | free(uris); | |
3986 | goto error; | |
3987 | } | |
3988 | } | |
3989 | ||
3990 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3991 | nb_uri, &cmd_ctx->creds); | |
3992 | free(uris); | |
3993 | break; | |
3994 | } | |
ecc48a90 JD |
3995 | case LTTNG_CREATE_SESSION_LIVE: |
3996 | { | |
3997 | size_t nb_uri, len; | |
3998 | struct lttng_uri *uris = NULL; | |
3999 | ||
4000 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
4001 | len = nb_uri * sizeof(struct lttng_uri); | |
4002 | ||
4003 | if (nb_uri > 0) { | |
4004 | uris = zmalloc(len); | |
4005 | if (uris == NULL) { | |
4006 | ret = LTTNG_ERR_FATAL; | |
4007 | goto error; | |
4008 | } | |
4009 | ||
4010 | /* Receive variable len data */ | |
4011 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
4012 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
4013 | if (ret <= 0) { | |
4014 | DBG("No URIs received from client... continuing"); | |
4015 | *sock_error = 1; | |
4016 | ret = LTTNG_ERR_SESSION_FAIL; | |
4017 | free(uris); | |
4018 | goto error; | |
4019 | } | |
4020 | ||
4021 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
4022 | DBG("Creating session with ONE network URI is a bad call"); | |
4023 | ret = LTTNG_ERR_SESSION_FAIL; | |
4024 | free(uris); | |
4025 | goto error; | |
4026 | } | |
4027 | } | |
4028 | ||
4029 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
4030 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
4031 | free(uris); | |
4032 | break; | |
4033 | } | |
fb198a11 JG |
4034 | case LTTNG_SAVE_SESSION: |
4035 | { | |
4036 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
4037 | &cmd_ctx->creds); | |
4038 | break; | |
4039 | } | |
d7ba1388 MD |
4040 | case LTTNG_SET_SESSION_SHM_PATH: |
4041 | { | |
4042 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
4043 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
4044 | break; | |
4045 | } | |
eded6438 | 4046 | case LTTNG_REGENERATE_METADATA: |
93ec662e | 4047 | { |
eded6438 | 4048 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
93ec662e JD |
4049 | break; |
4050 | } | |
c2561365 JD |
4051 | case LTTNG_REGENERATE_STATEDUMP: |
4052 | { | |
4053 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
4054 | break; | |
4055 | } | |
b3530820 JG |
4056 | case LTTNG_REGISTER_TRIGGER: |
4057 | { | |
4058 | ret = cmd_register_trigger(cmd_ctx, sock, | |
4059 | notification_thread_handle); | |
4060 | break; | |
4061 | } | |
4062 | case LTTNG_UNREGISTER_TRIGGER: | |
4063 | { | |
4064 | ret = cmd_unregister_trigger(cmd_ctx, sock, | |
4065 | notification_thread_handle); | |
4066 | break; | |
4067 | } | |
5c408ad8 JD |
4068 | case LTTNG_ROTATE_SESSION: |
4069 | { | |
4070 | struct lttng_rotate_session_return rotate_return; | |
4071 | ||
4072 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
4073 | ||
d68c9a04 | 4074 | memset(&rotate_return, 0, sizeof(rotate_return)); |
5c408ad8 JD |
4075 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
4076 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
4077 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
4078 | goto error; | |
4079 | } | |
4080 | ||
4081 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return); | |
4082 | if (ret < 0) { | |
4083 | ret = -ret; | |
4084 | goto error; | |
4085 | } | |
4086 | ||
4087 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
4088 | sizeof(rotate_return)); | |
4089 | if (ret < 0) { | |
4090 | ret = -ret; | |
4091 | goto error; | |
4092 | } | |
4093 | ||
4094 | ret = LTTNG_OK; | |
4095 | break; | |
4096 | } | |
d68c9a04 | 4097 | case LTTNG_ROTATION_GET_INFO: |
5c408ad8 | 4098 | { |
d68c9a04 | 4099 | struct lttng_rotation_get_info_return get_info_return; |
5c408ad8 | 4100 | |
d68c9a04 JD |
4101 | memset(&get_info_return, 0, sizeof(get_info_return)); |
4102 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
4103 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); | |
5c408ad8 JD |
4104 | if (ret < 0) { |
4105 | ret = -ret; | |
4106 | goto error; | |
4107 | } | |
4108 | ||
d68c9a04 JD |
4109 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, |
4110 | sizeof(get_info_return)); | |
5c408ad8 JD |
4111 | if (ret < 0) { |
4112 | ret = -ret; | |
4113 | goto error; | |
4114 | } | |
4115 | ||
4116 | ret = LTTNG_OK; | |
4117 | break; | |
4118 | } | |
259c2674 JD |
4119 | case LTTNG_ROTATION_SET_SCHEDULE: |
4120 | { | |
66ea93b1 JG |
4121 | bool set_schedule; |
4122 | enum lttng_rotation_schedule_type schedule_type; | |
4123 | uint64_t value; | |
4124 | ||
259c2674 JD |
4125 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
4126 | DBG("Kernel tracer version does not support session rotations"); | |
4127 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
4128 | goto error; | |
4129 | } | |
4130 | ||
66ea93b1 JG |
4131 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; |
4132 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; | |
4133 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; | |
4134 | ||
259c2674 | 4135 | ret = cmd_rotation_set_schedule(cmd_ctx->session, |
66ea93b1 JG |
4136 | set_schedule, |
4137 | schedule_type, | |
4138 | value, | |
90936dcf | 4139 | notification_thread_handle); |
a2026546 | 4140 | if (ret != LTTNG_OK) { |
259c2674 JD |
4141 | goto error; |
4142 | } | |
4143 | ||
259c2674 JD |
4144 | break; |
4145 | } | |
66ea93b1 | 4146 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
329f3443 | 4147 | { |
66ea93b1 JG |
4148 | struct lttng_session_list_schedules_return schedules = { |
4149 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
4150 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
4151 | .size.set = !!cmd_ctx->session->rotate_size, | |
4152 | .size.value = cmd_ctx->session->rotate_size, | |
4153 | }; | |
4154 | ||
4155 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
4156 | sizeof(schedules)); | |
329f3443 JD |
4157 | if (ret < 0) { |
4158 | ret = -ret; | |
4159 | goto error; | |
4160 | } | |
4161 | ||
4162 | ret = LTTNG_OK; | |
4163 | break; | |
4164 | } | |
5e16da05 | 4165 | default: |
f73fabfd | 4166 | ret = LTTNG_ERR_UND; |
5461b305 | 4167 | break; |
fac6795d DG |
4168 | } |
4169 | ||
5461b305 | 4170 | error: |
5461b305 DG |
4171 | if (cmd_ctx->llm == NULL) { |
4172 | DBG("Missing llm structure. Allocating one."); | |
6e10c9b9 | 4173 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
5461b305 DG |
4174 | goto setup_error; |
4175 | } | |
4176 | } | |
54d01ffb | 4177 | /* Set return code */ |
5461b305 | 4178 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 4179 | setup_error: |
b5541356 | 4180 | if (cmd_ctx->session) { |
54d01ffb | 4181 | session_unlock(cmd_ctx->session); |
e32d7f27 | 4182 | session_put(cmd_ctx->session); |
b5541356 | 4183 | } |
256a5576 MD |
4184 | if (need_tracing_session) { |
4185 | session_unlock_list(); | |
4186 | } | |
54d01ffb | 4187 | init_setup_error: |
3745d315 | 4188 | assert(!rcu_read_ongoing()); |
8028d920 | 4189 | return ret; |
fac6795d DG |
4190 | } |
4191 | ||
1d4b027a | 4192 | /* |
d063d709 DG |
4193 | * This thread manage all clients request using the unix client socket for |
4194 | * communication. | |
1d4b027a DG |
4195 | */ |
4196 | static void *thread_manage_clients(void *data) | |
4197 | { | |
139ac872 | 4198 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 4199 | int sock_error; |
5eb91c98 | 4200 | uint32_t revents, nb_fd; |
273ea72c | 4201 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4202 | struct lttng_poll_event events; |
1d4b027a DG |
4203 | |
4204 | DBG("[thread] Manage client started"); | |
4205 | ||
f6a9efaa DG |
4206 | rcu_register_thread(); |
4207 | ||
6c71277b | 4208 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 4209 | |
840cb59c | 4210 | health_code_update(); |
44a5e5eb | 4211 | |
1d4b027a DG |
4212 | ret = lttcomm_listen_unix_sock(client_sock); |
4213 | if (ret < 0) { | |
35df2755 | 4214 | goto error_listen; |
1d4b027a DG |
4215 | } |
4216 | ||
5eb91c98 DG |
4217 | /* |
4218 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4219 | * more will be added to this poll set. | |
4220 | */ | |
d0b96690 | 4221 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 4222 | if (ret < 0) { |
35df2755 | 4223 | goto error_create_poll; |
5eb91c98 | 4224 | } |
273ea72c | 4225 | |
5eb91c98 DG |
4226 | /* Add the application registration socket */ |
4227 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4228 | if (ret < 0) { | |
4229 | goto error; | |
4230 | } | |
273ea72c | 4231 | |
ef367a93 JG |
4232 | ret = sem_post(&load_info->message_thread_ready); |
4233 | if (ret) { | |
4234 | PERROR("sem_post message_thread_ready"); | |
4235 | goto error; | |
4236 | } | |
0bb7724a | 4237 | |
f28f9e44 JG |
4238 | /* |
4239 | * Wait until all support threads are initialized before accepting | |
4240 | * commands. | |
4241 | */ | |
4242 | while (uatomic_read(<tng_sessiond_ready) != 0) { | |
f28f9e44 JG |
4243 | /* |
4244 | * If a support thread failed to launch, it may signal that | |
4245 | * we must exit and the sessiond would never be marked as | |
4246 | * "ready". | |
4247 | * | |
4248 | * The timeout is set to 1ms, which serves as a way to | |
4249 | * pace down this check. | |
4250 | */ | |
a7333da7 JG |
4251 | ret = sessiond_wait_for_quit_pipe(1000); |
4252 | if (ret > 0) { | |
f28f9e44 JG |
4253 | goto exit; |
4254 | } | |
4255 | } | |
8b0d4636 JG |
4256 | /* |
4257 | * This barrier is paired with the one in sessiond_notify_ready() to | |
4258 | * ensure that loads accessing data initialized by the other threads, | |
4259 | * on which this thread was waiting, are not performed before this point. | |
4260 | * | |
4261 | * Note that this could be a 'read' memory barrier, but a full barrier | |
4262 | * is used in case the code changes. The performance implications of | |
4263 | * this choice are minimal since this is a slow path. | |
4264 | */ | |
4265 | cmm_smp_mb(); | |
f28f9e44 | 4266 | |
72453c8c MD |
4267 | /* This testpoint is after we signal readiness to the parent. */ |
4268 | if (testpoint(sessiond_thread_manage_clients)) { | |
4269 | goto error; | |
4270 | } | |
4271 | ||
e547b070 | 4272 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
4273 | goto error; |
4274 | } | |
8ac94142 | 4275 | |
840cb59c | 4276 | health_code_update(); |
44a5e5eb | 4277 | |
99d688f2 JG |
4278 | /* Set state as running. */ |
4279 | sessiond_set_client_thread_state(true); | |
4280 | ||
1d4b027a | 4281 | while (1) { |
a503e1ef JG |
4282 | const struct cmd_completion_handler *cmd_completion_handler; |
4283 | ||
1d4b027a | 4284 | DBG("Accepting client command ..."); |
273ea72c DG |
4285 | |
4286 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 4287 | restart: |
a78af745 | 4288 | health_poll_entry(); |
5eb91c98 | 4289 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 4290 | health_poll_exit(); |
273ea72c | 4291 | if (ret < 0) { |
88f2b785 MD |
4292 | /* |
4293 | * Restart interrupted system call. | |
4294 | */ | |
4295 | if (errno == EINTR) { | |
4296 | goto restart; | |
4297 | } | |
273ea72c DG |
4298 | goto error; |
4299 | } | |
4300 | ||
0d9c5d77 DG |
4301 | nb_fd = ret; |
4302 | ||
5eb91c98 DG |
4303 | for (i = 0; i < nb_fd; i++) { |
4304 | /* Fetch once the poll data */ | |
4305 | revents = LTTNG_POLL_GETEV(&events, i); | |
4306 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4307 | ||
840cb59c | 4308 | health_code_update(); |
44a5e5eb | 4309 | |
fd20dac9 MD |
4310 | if (!revents) { |
4311 | /* No activity for this FD (poll implementation). */ | |
4312 | continue; | |
4313 | } | |
4314 | ||
5eb91c98 | 4315 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4316 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 4317 | if (ret) { |
139ac872 MD |
4318 | err = 0; |
4319 | goto exit; | |
5eb91c98 DG |
4320 | } |
4321 | ||
4322 | /* Event on the registration socket */ | |
4323 | if (pollfd == client_sock) { | |
03e43155 MD |
4324 | if (revents & LPOLLIN) { |
4325 | continue; | |
4326 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
5eb91c98 DG |
4327 | ERR("Client socket poll error"); |
4328 | goto error; | |
03e43155 MD |
4329 | } else { |
4330 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
4331 | goto error; | |
5eb91c98 DG |
4332 | } |
4333 | } | |
4334 | } | |
4335 | ||
4336 | DBG("Wait for client response"); | |
4337 | ||
840cb59c | 4338 | health_code_update(); |
44a5e5eb | 4339 | |
5eb91c98 DG |
4340 | sock = lttcomm_accept_unix_sock(client_sock); |
4341 | if (sock < 0) { | |
273ea72c | 4342 | goto error; |
273ea72c DG |
4343 | } |
4344 | ||
b662582b DG |
4345 | /* |
4346 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4347 | * show must go on. | |
4348 | */ | |
4349 | (void) utils_set_fd_cloexec(sock); | |
4350 | ||
be040666 DG |
4351 | /* Set socket option for credentials retrieval */ |
4352 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4353 | if (ret < 0) { | |
4354 | goto error; | |
4355 | } | |
4356 | ||
5eb91c98 | 4357 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4358 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4359 | if (cmd_ctx == NULL) { |
76d7553f | 4360 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4361 | goto error; |
5eb91c98 | 4362 | } |
1d4b027a | 4363 | |
5eb91c98 | 4364 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4365 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4366 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4367 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4368 | goto error; |
4369 | } | |
1d4b027a | 4370 | |
5eb91c98 DG |
4371 | cmd_ctx->llm = NULL; |
4372 | cmd_ctx->session = NULL; | |
1d4b027a | 4373 | |
840cb59c | 4374 | health_code_update(); |
44a5e5eb | 4375 | |
5eb91c98 DG |
4376 | /* |
4377 | * Data is received from the lttng client. The struct | |
4378 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4379 | * the client. | |
4380 | */ | |
4381 | DBG("Receiving data from client ..."); | |
be040666 DG |
4382 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4383 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4384 | if (ret <= 0) { |
4385 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4386 | ret = close(sock); |
4387 | if (ret) { | |
4388 | PERROR("close"); | |
4389 | } | |
4390 | sock = -1; | |
a2c0da86 | 4391 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4392 | continue; |
4393 | } | |
1d4b027a | 4394 | |
840cb59c | 4395 | health_code_update(); |
44a5e5eb | 4396 | |
5eb91c98 DG |
4397 | // TODO: Validate cmd_ctx including sanity check for |
4398 | // security purpose. | |
f7776ea7 | 4399 | |
f6a9efaa | 4400 | rcu_thread_online(); |
5eb91c98 DG |
4401 | /* |
4402 | * This function dispatch the work to the kernel or userspace tracer | |
4403 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4404 | * informations for the client. The command context struct contains | |
4405 | * everything this function may needs. | |
4406 | */ | |
53a80697 | 4407 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4408 | rcu_thread_offline(); |
5eb91c98 | 4409 | if (ret < 0) { |
36134aa1 DG |
4410 | ret = close(sock); |
4411 | if (ret) { | |
4412 | PERROR("close"); | |
53a80697 | 4413 | } |
36134aa1 | 4414 | sock = -1; |
bbd973c2 | 4415 | /* |
5eb91c98 | 4416 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4417 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4418 | * (ENOMEM). Error detected but still accept |
4419 | * command, unless a socket error has been | |
4420 | * detected. | |
bbd973c2 | 4421 | */ |
bbd973c2 | 4422 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4423 | continue; |
4424 | } | |
d6e4fca4 | 4425 | |
a503e1ef JG |
4426 | cmd_completion_handler = cmd_pop_completion_handler(); |
4427 | if (cmd_completion_handler) { | |
4428 | enum lttng_error_code completion_code; | |
4429 | ||
4430 | completion_code = cmd_completion_handler->run( | |
4431 | cmd_completion_handler->data); | |
4432 | if (completion_code != LTTNG_OK) { | |
4433 | clean_command_ctx(&cmd_ctx); | |
4434 | continue; | |
4435 | } | |
4436 | } | |
4437 | ||
840cb59c | 4438 | health_code_update(); |
44a5e5eb | 4439 | |
a1ac8b97 | 4440 | DBG("Sending response (size: %d, retcode: %s (%d))", |
54d01ffb | 4441 | cmd_ctx->lttng_msg_size, |
a1ac8b97 JG |
4442 | lttng_strerror(-cmd_ctx->llm->ret_code), |
4443 | cmd_ctx->llm->ret_code); | |
54d01ffb | 4444 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4445 | if (ret < 0) { |
4446 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4447 | } |
1d4b027a | 4448 | |
5eb91c98 | 4449 | /* End of transmission */ |
76d7553f MD |
4450 | ret = close(sock); |
4451 | if (ret) { | |
4452 | PERROR("close"); | |
4453 | } | |
4454 | sock = -1; | |
be040666 DG |
4455 | |
4456 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4457 | |
840cb59c | 4458 | health_code_update(); |
273ea72c DG |
4459 | } |
4460 | ||
139ac872 | 4461 | exit: |
5eb91c98 | 4462 | error: |
35df2755 CB |
4463 | if (sock >= 0) { |
4464 | ret = close(sock); | |
4465 | if (ret) { | |
4466 | PERROR("close"); | |
4467 | } | |
139ac872 | 4468 | } |
44a5e5eb | 4469 | |
35df2755 CB |
4470 | lttng_poll_clean(&events); |
4471 | clean_command_ctx(&cmd_ctx); | |
4472 | ||
4473 | error_listen: | |
4474 | error_create_poll: | |
e6142f2e | 4475 | unlink(config.client_unix_sock_path.value); |
76d7553f MD |
4476 | if (client_sock >= 0) { |
4477 | ret = close(client_sock); | |
4478 | if (ret) { | |
4479 | PERROR("close"); | |
4480 | } | |
a4b35e07 | 4481 | } |
35df2755 CB |
4482 | |
4483 | if (err) { | |
840cb59c | 4484 | health_error(); |
35df2755 | 4485 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4486 | } |
273ea72c | 4487 | |
8782cc74 | 4488 | health_unregister(health_sessiond); |
35df2755 CB |
4489 | |
4490 | DBG("Client thread dying"); | |
f6a9efaa DG |
4491 | |
4492 | rcu_unregister_thread(); | |
4a15001e MD |
4493 | |
4494 | /* | |
4495 | * Since we are creating the consumer threads, we own them, so we need | |
4496 | * to join them before our thread exits. | |
4497 | */ | |
4498 | ret = join_consumer_thread(&kconsumer_data); | |
4499 | if (ret) { | |
4500 | errno = ret; | |
4501 | PERROR("join_consumer"); | |
4502 | } | |
4503 | ||
4504 | ret = join_consumer_thread(&ustconsumer32_data); | |
4505 | if (ret) { | |
4506 | errno = ret; | |
4507 | PERROR("join_consumer ust32"); | |
4508 | } | |
4509 | ||
4510 | ret = join_consumer_thread(&ustconsumer64_data); | |
4511 | if (ret) { | |
4512 | errno = ret; | |
4513 | PERROR("join_consumer ust64"); | |
4514 | } | |
99d688f2 JG |
4515 | |
4516 | /* Set state as non-running. */ | |
4517 | sessiond_set_client_thread_state(false); | |
1d4b027a DG |
4518 | return NULL; |
4519 | } | |
4520 | ||
c0232ea5 JG |
4521 | static int string_match(const char *str1, const char *str2) |
4522 | { | |
4523 | return (str1 && str2) && !strcmp(str1, str2); | |
4524 | } | |
4525 | ||
fac6795d | 4526 | /* |
26296c48 JG |
4527 | * Take an option from the getopt output and set it in the right variable to be |
4528 | * used later. | |
4529 | * | |
4530 | * Return 0 on success else a negative value. | |
fac6795d | 4531 | */ |
26296c48 | 4532 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4533 | { |
26296c48 | 4534 | int ret = 0; |
fac6795d | 4535 | |
c0232ea5 | 4536 | if (string_match(optname, "client-sock") || opt == 'c') { |
66b2ce8e JG |
4537 | if (!arg || *arg == '\0') { |
4538 | ret = -EINVAL; | |
4539 | goto end; | |
4540 | } | |
e8fa9fb0 MD |
4541 | if (lttng_is_setuid_setgid()) { |
4542 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4543 | "-c, --client-sock"); | |
4544 | } else { | |
e6142f2e JG |
4545 | config_string_set(&config.client_unix_sock_path, |
4546 | strdup(arg)); | |
4547 | if (!config.client_unix_sock_path.value) { | |
4548 | ret = -ENOMEM; | |
4549 | PERROR("strdup"); | |
4550 | } | |
e8fa9fb0 | 4551 | } |
c0232ea5 | 4552 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
66b2ce8e JG |
4553 | if (!arg || *arg == '\0') { |
4554 | ret = -EINVAL; | |
4555 | goto end; | |
4556 | } | |
e8fa9fb0 MD |
4557 | if (lttng_is_setuid_setgid()) { |
4558 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4559 | "-a, --apps-sock"); | |
4560 | } else { | |
e6142f2e JG |
4561 | config_string_set(&config.apps_unix_sock_path, |
4562 | strdup(arg)); | |
4563 | if (!config.apps_unix_sock_path.value) { | |
4564 | ret = -ENOMEM; | |
4565 | PERROR("strdup"); | |
4566 | } | |
e8fa9fb0 | 4567 | } |
c0232ea5 | 4568 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
e6142f2e | 4569 | config.daemonize = true; |
c0232ea5 | 4570 | } else if (string_match(optname, "background") || opt == 'b') { |
e6142f2e | 4571 | config.background = true; |
c0232ea5 | 4572 | } else if (string_match(optname, "group") || opt == 'g') { |
66b2ce8e JG |
4573 | if (!arg || *arg == '\0') { |
4574 | ret = -EINVAL; | |
4575 | goto end; | |
4576 | } | |
e8fa9fb0 MD |
4577 | if (lttng_is_setuid_setgid()) { |
4578 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4579 | "-g, --group"); | |
4580 | } else { | |
e6142f2e JG |
4581 | config_string_set(&config.tracing_group_name, |
4582 | strdup(arg)); | |
4583 | if (!config.tracing_group_name.value) { | |
e8fa9fb0 | 4584 | ret = -ENOMEM; |
e6142f2e | 4585 | PERROR("strdup"); |
e8fa9fb0 | 4586 | } |
db322c4d | 4587 | } |
c0232ea5 | 4588 | } else if (string_match(optname, "help") || opt == 'h') { |
4fc83d94 | 4589 | ret = utils_show_help(8, "lttng-sessiond", help_msg); |
8190767e | 4590 | if (ret) { |
4fc83d94 | 4591 | ERR("Cannot show --help for `lttng-sessiond`"); |
8190767e PP |
4592 | perror("exec"); |
4593 | } | |
4594 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
c0232ea5 | 4595 | } else if (string_match(optname, "version") || opt == 'V') { |
26296c48 JG |
4596 | fprintf(stdout, "%s\n", VERSION); |
4597 | exit(EXIT_SUCCESS); | |
c0232ea5 | 4598 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
e6142f2e | 4599 | config.sig_parent = true; |
c0232ea5 | 4600 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
66b2ce8e JG |
4601 | if (!arg || *arg == '\0') { |
4602 | ret = -EINVAL; | |
4603 | goto end; | |
4604 | } | |
e8fa9fb0 MD |
4605 | if (lttng_is_setuid_setgid()) { |
4606 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4607 | "--kconsumerd-err-sock"); | |
4608 | } else { | |
e6142f2e JG |
4609 | config_string_set(&config.kconsumerd_err_unix_sock_path, |
4610 | strdup(arg)); | |
4611 | if (!config.kconsumerd_err_unix_sock_path.value) { | |
4612 | ret = -ENOMEM; | |
4613 | PERROR("strdup"); | |
4614 | } | |
e8fa9fb0 | 4615 | } |
c0232ea5 | 4616 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
66b2ce8e JG |
4617 | if (!arg || *arg == '\0') { |
4618 | ret = -EINVAL; | |
4619 | goto end; | |
4620 | } | |
e8fa9fb0 MD |
4621 | if (lttng_is_setuid_setgid()) { |
4622 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4623 | "--kconsumerd-cmd-sock"); | |
4624 | } else { | |
e6142f2e JG |
4625 | config_string_set(&config.kconsumerd_cmd_unix_sock_path, |
4626 | strdup(arg)); | |
4627 | if (!config.kconsumerd_cmd_unix_sock_path.value) { | |
4628 | ret = -ENOMEM; | |
4629 | PERROR("strdup"); | |
4630 | } | |
e8fa9fb0 | 4631 | } |
c0232ea5 | 4632 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
66b2ce8e JG |
4633 | if (!arg || *arg == '\0') { |
4634 | ret = -EINVAL; | |
4635 | goto end; | |
4636 | } | |
e8fa9fb0 MD |
4637 | if (lttng_is_setuid_setgid()) { |
4638 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4639 | "--ustconsumerd64-err-sock"); | |
4640 | } else { | |
e6142f2e JG |
4641 | config_string_set(&config.consumerd64_err_unix_sock_path, |
4642 | strdup(arg)); | |
4643 | if (!config.consumerd64_err_unix_sock_path.value) { | |
4644 | ret = -ENOMEM; | |
4645 | PERROR("strdup"); | |
4646 | } | |
e8fa9fb0 | 4647 | } |
c0232ea5 | 4648 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
66b2ce8e JG |
4649 | if (!arg || *arg == '\0') { |
4650 | ret = -EINVAL; | |
4651 | goto end; | |
4652 | } | |
e8fa9fb0 MD |
4653 | if (lttng_is_setuid_setgid()) { |
4654 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4655 | "--ustconsumerd64-cmd-sock"); | |
4656 | } else { | |
e6142f2e JG |
4657 | config_string_set(&config.consumerd64_cmd_unix_sock_path, |
4658 | strdup(arg)); | |
4659 | if (!config.consumerd64_cmd_unix_sock_path.value) { | |
4660 | ret = -ENOMEM; | |
4661 | PERROR("strdup"); | |
4662 | } | |
e8fa9fb0 | 4663 | } |
c0232ea5 | 4664 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
66b2ce8e JG |
4665 | if (!arg || *arg == '\0') { |
4666 | ret = -EINVAL; | |
4667 | goto end; | |
4668 | } | |
e8fa9fb0 MD |
4669 | if (lttng_is_setuid_setgid()) { |
4670 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4671 | "--ustconsumerd32-err-sock"); | |
4672 | } else { | |
e6142f2e JG |
4673 | config_string_set(&config.consumerd32_err_unix_sock_path, |
4674 | strdup(arg)); | |
4675 | if (!config.consumerd32_err_unix_sock_path.value) { | |
4676 | ret = -ENOMEM; | |
4677 | PERROR("strdup"); | |
4678 | } | |
e8fa9fb0 | 4679 | } |
c0232ea5 | 4680 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
66b2ce8e JG |
4681 | if (!arg || *arg == '\0') { |
4682 | ret = -EINVAL; | |
4683 | goto end; | |
4684 | } | |
e8fa9fb0 MD |
4685 | if (lttng_is_setuid_setgid()) { |
4686 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4687 | "--ustconsumerd32-cmd-sock"); | |
4688 | } else { | |
e6142f2e JG |
4689 | config_string_set(&config.consumerd32_cmd_unix_sock_path, |
4690 | strdup(arg)); | |
4691 | if (!config.consumerd32_cmd_unix_sock_path.value) { | |
4692 | ret = -ENOMEM; | |
4693 | PERROR("strdup"); | |
4694 | } | |
e8fa9fb0 | 4695 | } |
c0232ea5 | 4696 | } else if (string_match(optname, "no-kernel")) { |
e6142f2e | 4697 | config.no_kernel = true; |
c0232ea5 | 4698 | } else if (string_match(optname, "quiet") || opt == 'q') { |
6d9a9c65 | 4699 | config.quiet = true; |
c0232ea5 | 4700 | } else if (string_match(optname, "verbose") || opt == 'v') { |
26296c48 JG |
4701 | /* Verbose level can increase using multiple -v */ |
4702 | if (arg) { | |
13755a18 | 4703 | /* Value obtained from config file */ |
e6142f2e | 4704 | config.verbose = config_parse_value(arg); |
26296c48 | 4705 | } else { |
13755a18 | 4706 | /* -v used on command line */ |
e6142f2e | 4707 | config.verbose++; |
26296c48 | 4708 | } |
13755a18 | 4709 | /* Clamp value to [0, 3] */ |
e6142f2e JG |
4710 | config.verbose = config.verbose < 0 ? 0 : |
4711 | (config.verbose <= 3 ? config.verbose : 3); | |
c0232ea5 | 4712 | } else if (string_match(optname, "verbose-consumer")) { |
26296c48 | 4713 | if (arg) { |
e6142f2e | 4714 | config.verbose_consumer = config_parse_value(arg); |
26296c48 | 4715 | } else { |
e6142f2e | 4716 | config.verbose_consumer++; |
26296c48 | 4717 | } |
c0232ea5 | 4718 | } else if (string_match(optname, "consumerd32-path")) { |
66b2ce8e JG |
4719 | if (!arg || *arg == '\0') { |
4720 | ret = -EINVAL; | |
4721 | goto end; | |
4722 | } | |
e8fa9fb0 MD |
4723 | if (lttng_is_setuid_setgid()) { |
4724 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4725 | "--consumerd32-path"); | |
4726 | } else { | |
e6142f2e JG |
4727 | config_string_set(&config.consumerd32_bin_path, |
4728 | strdup(arg)); | |
4729 | if (!config.consumerd32_bin_path.value) { | |
e8fa9fb0 MD |
4730 | PERROR("strdup"); |
4731 | ret = -ENOMEM; | |
4732 | } | |
db322c4d | 4733 | } |
c0232ea5 | 4734 | } else if (string_match(optname, "consumerd32-libdir")) { |
66b2ce8e JG |
4735 | if (!arg || *arg == '\0') { |
4736 | ret = -EINVAL; | |
4737 | goto end; | |
4738 | } | |
e8fa9fb0 MD |
4739 | if (lttng_is_setuid_setgid()) { |
4740 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4741 | "--consumerd32-libdir"); | |
4742 | } else { | |
e6142f2e JG |
4743 | config_string_set(&config.consumerd32_lib_dir, |
4744 | strdup(arg)); | |
4745 | if (!config.consumerd32_lib_dir.value) { | |
e8fa9fb0 MD |
4746 | PERROR("strdup"); |
4747 | ret = -ENOMEM; | |
4748 | } | |
db322c4d | 4749 | } |
c0232ea5 | 4750 | } else if (string_match(optname, "consumerd64-path")) { |
66b2ce8e JG |
4751 | if (!arg || *arg == '\0') { |
4752 | ret = -EINVAL; | |
4753 | goto end; | |
4754 | } | |
e8fa9fb0 MD |
4755 | if (lttng_is_setuid_setgid()) { |
4756 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4757 | "--consumerd64-path"); | |
4758 | } else { | |
e6142f2e JG |
4759 | config_string_set(&config.consumerd64_bin_path, |
4760 | strdup(arg)); | |
4761 | if (!config.consumerd64_bin_path.value) { | |
e8fa9fb0 MD |
4762 | PERROR("strdup"); |
4763 | ret = -ENOMEM; | |
4764 | } | |
db322c4d | 4765 | } |
c0232ea5 | 4766 | } else if (string_match(optname, "consumerd64-libdir")) { |
66b2ce8e JG |
4767 | if (!arg || *arg == '\0') { |
4768 | ret = -EINVAL; | |
4769 | goto end; | |
4770 | } | |
e8fa9fb0 MD |
4771 | if (lttng_is_setuid_setgid()) { |
4772 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4773 | "--consumerd64-libdir"); | |
4774 | } else { | |
e6142f2e JG |
4775 | config_string_set(&config.consumerd64_lib_dir, |
4776 | strdup(arg)); | |
4777 | if (!config.consumerd64_lib_dir.value) { | |
e8fa9fb0 MD |
4778 | PERROR("strdup"); |
4779 | ret = -ENOMEM; | |
4780 | } | |
db322c4d | 4781 | } |
c0232ea5 | 4782 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
66b2ce8e JG |
4783 | if (!arg || *arg == '\0') { |
4784 | ret = -EINVAL; | |
4785 | goto end; | |
4786 | } | |
e8fa9fb0 MD |
4787 | if (lttng_is_setuid_setgid()) { |
4788 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4789 | "-p, --pidfile"); | |
4790 | } else { | |
e6142f2e JG |
4791 | config_string_set(&config.pid_file_path, strdup(arg)); |
4792 | if (!config.pid_file_path.value) { | |
e8fa9fb0 MD |
4793 | PERROR("strdup"); |
4794 | ret = -ENOMEM; | |
4795 | } | |
db322c4d | 4796 | } |
c0232ea5 | 4797 | } else if (string_match(optname, "agent-tcp-port")) { |
66b2ce8e JG |
4798 | if (!arg || *arg == '\0') { |
4799 | ret = -EINVAL; | |
4800 | goto end; | |
4801 | } | |
e8fa9fb0 MD |
4802 | if (lttng_is_setuid_setgid()) { |
4803 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4804 | "--agent-tcp-port"); | |
4805 | } else { | |
4806 | unsigned long v; | |
4d076222 | 4807 | |
e8fa9fb0 MD |
4808 | errno = 0; |
4809 | v = strtoul(arg, NULL, 0); | |
4810 | if (errno != 0 || !isdigit(arg[0])) { | |
4811 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); | |
4812 | return -1; | |
4813 | } | |
4814 | if (v == 0 || v >= 65535) { | |
4815 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); | |
4816 | return -1; | |
4817 | } | |
2288467f JG |
4818 | config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v; |
4819 | DBG3("Agent TCP port set to non default: %i", (int) v); | |
26296c48 | 4820 | } |
c0232ea5 | 4821 | } else if (string_match(optname, "load") || opt == 'l') { |
66b2ce8e JG |
4822 | if (!arg || *arg == '\0') { |
4823 | ret = -EINVAL; | |
4824 | goto end; | |
4825 | } | |
e8fa9fb0 MD |
4826 | if (lttng_is_setuid_setgid()) { |
4827 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4828 | "-l, --load"); | |
4829 | } else { | |
e6142f2e JG |
4830 | config_string_set(&config.load_session_path, strdup(arg)); |
4831 | if (!config.load_session_path.value) { | |
e8fa9fb0 MD |
4832 | PERROR("strdup"); |
4833 | ret = -ENOMEM; | |
4834 | } | |
ef367a93 | 4835 | } |
c0232ea5 | 4836 | } else if (string_match(optname, "kmod-probes")) { |
66b2ce8e JG |
4837 | if (!arg || *arg == '\0') { |
4838 | ret = -EINVAL; | |
4839 | goto end; | |
4840 | } | |
e8fa9fb0 MD |
4841 | if (lttng_is_setuid_setgid()) { |
4842 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4843 | "--kmod-probes"); | |
4844 | } else { | |
e6142f2e JG |
4845 | config_string_set(&config.kmod_probes_list, strdup(arg)); |
4846 | if (!config.kmod_probes_list.value) { | |
e8fa9fb0 MD |
4847 | PERROR("strdup"); |
4848 | ret = -ENOMEM; | |
4849 | } | |
c9d42407 | 4850 | } |
c0232ea5 | 4851 | } else if (string_match(optname, "extra-kmod-probes")) { |
66b2ce8e JG |
4852 | if (!arg || *arg == '\0') { |
4853 | ret = -EINVAL; | |
4854 | goto end; | |
4855 | } | |
e8fa9fb0 MD |
4856 | if (lttng_is_setuid_setgid()) { |
4857 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4858 | "--extra-kmod-probes"); | |
4859 | } else { | |
e6142f2e JG |
4860 | config_string_set(&config.kmod_extra_probes_list, |
4861 | strdup(arg)); | |
4862 | if (!config.kmod_extra_probes_list.value) { | |
e8fa9fb0 MD |
4863 | PERROR("strdup"); |
4864 | ret = -ENOMEM; | |
4865 | } | |
db322c4d | 4866 | } |
c0232ea5 JG |
4867 | } else if (string_match(optname, "config") || opt == 'f') { |
4868 | /* This is handled in set_options() thus silent skip. */ | |
4869 | goto end; | |
4870 | } else { | |
26296c48 JG |
4871 | /* Unknown option or other error. |
4872 | * Error is printed by getopt, just return */ | |
4873 | ret = -1; | |
4874 | } | |
4875 | ||
f3dd7ce7 | 4876 | end: |
c5d350b2 JG |
4877 | if (ret == -EINVAL) { |
4878 | const char *opt_name = "unknown"; | |
4879 | int i; | |
4880 | ||
4881 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); | |
4882 | i++) { | |
4883 | if (opt == long_options[i].val) { | |
4884 | opt_name = long_options[i].name; | |
4885 | break; | |
4886 | } | |
4887 | } | |
4888 | ||
4889 | WARN("Invalid argument provided for option \"%s\", using default value.", | |
4890 | opt_name); | |
4891 | } | |
f3dd7ce7 | 4892 | |
26296c48 JG |
4893 | return ret; |
4894 | } | |
4895 | ||
4896 | /* | |
4897 | * config_entry_handler_cb used to handle options read from a config file. | |
f40ef1d5 | 4898 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
26296c48 JG |
4899 | * return value conventions. |
4900 | */ | |
4901 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
4902 | { | |
4903 | int ret = 0, i; | |
4904 | ||
4905 | if (!entry || !entry->name || !entry->value) { | |
4906 | ret = -EINVAL; | |
4907 | goto end; | |
4908 | } | |
4909 | ||
4910 | /* Check if the option is to be ignored */ | |
4911 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
4912 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
4913 | goto end; | |
4914 | } | |
4915 | } | |
4916 | ||
4917 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
4918 | i++) { | |
4919 | ||
4920 | /* Ignore if not fully matched. */ | |
4921 | if (strcmp(entry->name, long_options[i].name)) { | |
4922 | continue; | |
4923 | } | |
4924 | ||
4925 | /* | |
4926 | * If the option takes no argument on the command line, we have to | |
4927 | * check if the value is "true". We support non-zero numeric values, | |
4928 | * true, on and yes. | |
4929 | */ | |
4930 | if (!long_options[i].has_arg) { | |
4931 | ret = config_parse_value(entry->value); | |
4932 | if (ret <= 0) { | |
4933 | if (ret) { | |
4934 | WARN("Invalid configuration value \"%s\" for option %s", | |
4935 | entry->value, entry->name); | |
4936 | } | |
4937 | /* False, skip boolean config option. */ | |
4938 | goto end; | |
4d076222 | 4939 | } |
26296c48 JG |
4940 | } |
4941 | ||
4942 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
4943 | goto end; | |
4944 | } | |
4945 | ||
4946 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
4947 | ||
4948 | end: | |
4949 | return ret; | |
4950 | } | |
4951 | ||
4952 | /* | |
4953 | * daemon configuration loading and argument parsing | |
4954 | */ | |
4955 | static int set_options(int argc, char **argv) | |
4956 | { | |
4957 | int ret = 0, c = 0, option_index = 0; | |
4958 | int orig_optopt = optopt, orig_optind = optind; | |
4959 | char *optstring; | |
4960 | const char *config_path = NULL; | |
4961 | ||
4962 | optstring = utils_generate_optstring(long_options, | |
4963 | sizeof(long_options) / sizeof(struct option)); | |
4964 | if (!optstring) { | |
4965 | ret = -ENOMEM; | |
4966 | goto end; | |
4967 | } | |
4968 | ||
4969 | /* Check for the --config option */ | |
4970 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
4971 | &option_index)) != -1) { | |
4972 | if (c == '?') { | |
4973 | ret = -EINVAL; | |
4974 | goto end; | |
4975 | } else if (c != 'f') { | |
4976 | /* if not equal to --config option. */ | |
4977 | continue; | |
4978 | } | |
4979 | ||
e8fa9fb0 MD |
4980 | if (lttng_is_setuid_setgid()) { |
4981 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4982 | "-f, --config"); | |
4983 | } else { | |
4984 | config_path = utils_expand_path(optarg); | |
4985 | if (!config_path) { | |
4986 | ERR("Failed to resolve path: %s", optarg); | |
4987 | } | |
26296c48 JG |
4988 | } |
4989 | } | |
4990 | ||
4991 | ret = config_get_section_entries(config_path, config_section_name, | |
4992 | config_entry_handler, NULL); | |
4993 | if (ret) { | |
4994 | if (ret > 0) { | |
4995 | ERR("Invalid configuration option at line %i", ret); | |
4996 | ret = -1; | |
4997 | } | |
4998 | goto end; | |
4999 | } | |
5000 | ||
5001 | /* Reset getopt's global state */ | |
5002 | optopt = orig_optopt; | |
5003 | optind = orig_optind; | |
5004 | while (1) { | |
c0232ea5 JG |
5005 | option_index = -1; |
5006 | /* | |
5007 | * getopt_long() will not set option_index if it encounters a | |
5008 | * short option. | |
5009 | */ | |
5010 | c = getopt_long(argc, argv, optstring, long_options, | |
5011 | &option_index); | |
26296c48 | 5012 | if (c == -1) { |
4d076222 DG |
5013 | break; |
5014 | } | |
26296c48 | 5015 | |
c0232ea5 JG |
5016 | /* |
5017 | * Pass NULL as the long option name if popt left the index | |
5018 | * unset. | |
5019 | */ | |
5020 | ret = set_option(c, optarg, | |
5021 | option_index < 0 ? NULL : | |
5022 | long_options[option_index].name); | |
26296c48 JG |
5023 | if (ret < 0) { |
5024 | break; | |
fac6795d DG |
5025 | } |
5026 | } | |
5027 | ||
26296c48 JG |
5028 | end: |
5029 | free(optstring); | |
5030 | return ret; | |
fac6795d DG |
5031 | } |
5032 | ||
5033 | /* | |
d063d709 | 5034 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
5035 | * apps_sock - The communication socket for all UST apps. |
5036 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 5037 | */ |
cf3af59e | 5038 | static int init_daemon_socket(void) |
fac6795d DG |
5039 | { |
5040 | int ret = 0; | |
5041 | mode_t old_umask; | |
5042 | ||
5043 | old_umask = umask(0); | |
5044 | ||
5045 | /* Create client tool unix socket */ | |
e6142f2e | 5046 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); |
d6f42150 | 5047 | if (client_sock < 0) { |
e6142f2e | 5048 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); |
fac6795d DG |
5049 | ret = -1; |
5050 | goto end; | |
5051 | } | |
5052 | ||
b662582b DG |
5053 | /* Set the cloexec flag */ |
5054 | ret = utils_set_fd_cloexec(client_sock); | |
5055 | if (ret < 0) { | |
5056 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
5057 | "Continuing but note that the consumer daemon will have a " | |
5058 | "reference to this socket on exec()", client_sock); | |
5059 | } | |
5060 | ||
fac6795d | 5061 | /* File permission MUST be 660 */ |
e6142f2e | 5062 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
fac6795d | 5063 | if (ret < 0) { |
e6142f2e | 5064 | ERR("Set file permissions failed: %s", config.client_unix_sock_path.value); |
76d7553f | 5065 | PERROR("chmod"); |
fac6795d DG |
5066 | goto end; |
5067 | } | |
5068 | ||
5069 | /* Create the application unix socket */ | |
e6142f2e | 5070 | apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value); |
d6f42150 | 5071 | if (apps_sock < 0) { |
e6142f2e | 5072 | ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value); |
fac6795d DG |
5073 | ret = -1; |
5074 | goto end; | |
5075 | } | |
5076 | ||
b662582b DG |
5077 | /* Set the cloexec flag */ |
5078 | ret = utils_set_fd_cloexec(apps_sock); | |
5079 | if (ret < 0) { | |
5080 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
5081 | "Continuing but note that the consumer daemon will have a " | |
5082 | "reference to this socket on exec()", apps_sock); | |
5083 | } | |
5084 | ||
d6f42150 | 5085 | /* File permission MUST be 666 */ |
e6142f2e | 5086 | ret = chmod(config.apps_unix_sock_path.value, |
54d01ffb | 5087 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
fac6795d | 5088 | if (ret < 0) { |
e6142f2e | 5089 | ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value); |
76d7553f | 5090 | PERROR("chmod"); |
fac6795d DG |
5091 | goto end; |
5092 | } | |
5093 | ||
b662582b DG |
5094 | DBG3("Session daemon client socket %d and application socket %d created", |
5095 | client_sock, apps_sock); | |
5096 | ||
fac6795d DG |
5097 | end: |
5098 | umask(old_umask); | |
5099 | return ret; | |
5100 | } | |
5101 | ||
f472090a JG |
5102 | /* |
5103 | * Create lockfile using the rundir and return its fd. | |
5104 | */ | |
5105 | static int create_lockfile(void) | |
5106 | { | |
5107 | return utils_create_lock_file(config.lock_file_path.value); | |
5108 | } | |
5109 | ||
fac6795d | 5110 | /* |
54d01ffb DG |
5111 | * Check if the global socket is available, and if a daemon is answering at the |
5112 | * other side. If yes, error is returned. | |
f472090a JG |
5113 | * |
5114 | * Also attempts to create and hold the lock file. | |
fac6795d | 5115 | */ |
cf3af59e | 5116 | static int check_existing_daemon(void) |
fac6795d | 5117 | { |
f472090a JG |
5118 | int ret = 0; |
5119 | ||
7d8234d9 | 5120 | /* Is there anybody out there ? */ |
099e26bd | 5121 | if (lttng_session_daemon_alive()) { |
f472090a JG |
5122 | ret = -EEXIST; |
5123 | goto end; | |
099e26bd | 5124 | } |
b09c7c76 | 5125 | |
f472090a JG |
5126 | lockfile_fd = create_lockfile(); |
5127 | if (lockfile_fd < 0) { | |
5128 | ret = -EEXIST; | |
5129 | goto end; | |
5130 | } | |
5131 | end: | |
5132 | return ret; | |
5133 | } | |
5134 | ||
5135 | static void sessiond_cleanup_lock_file(void) | |
5136 | { | |
5137 | int ret; | |
5138 | ||
5139 | /* | |
5140 | * Cleanup lock file by deleting it and finaly closing it which will | |
5141 | * release the file system lock. | |
5142 | */ | |
5143 | if (lockfile_fd >= 0) { | |
5144 | ret = remove(config.lock_file_path.value); | |
5145 | if (ret < 0) { | |
5146 | PERROR("remove lock file"); | |
5147 | } | |
5148 | ret = close(lockfile_fd); | |
5149 | if (ret < 0) { | |
5150 | PERROR("close lock file"); | |
5151 | } | |
5152 | } | |
fac6795d DG |
5153 | } |
5154 | ||
fac6795d | 5155 | /* |
d063d709 | 5156 | * Set the tracing group gid onto the client socket. |
5e16da05 | 5157 | * |
d063d709 | 5158 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 5159 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 5160 | */ |
be040666 | 5161 | static int set_permissions(char *rundir) |
fac6795d DG |
5162 | { |
5163 | int ret; | |
996b65c8 | 5164 | gid_t gid; |
fac6795d | 5165 | |
e6142f2e | 5166 | gid = utils_get_group_id(config.tracing_group_name.value); |
fac6795d | 5167 | |
d6f42150 | 5168 | /* Set lttng run dir */ |
be040666 | 5169 | ret = chown(rundir, 0, gid); |
d6f42150 | 5170 | if (ret < 0) { |
be040666 | 5171 | ERR("Unable to set group on %s", rundir); |
76d7553f | 5172 | PERROR("chown"); |
d6f42150 DG |
5173 | } |
5174 | ||
6c71277b MD |
5175 | /* |
5176 | * Ensure all applications and tracing group can search the run | |
5177 | * dir. Allow everyone to read the directory, since it does not | |
5178 | * buy us anything to hide its content. | |
5179 | */ | |
5180 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
5181 | if (ret < 0) { |
5182 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5183 | PERROR("chmod"); |
d1613cf5 JN |
5184 | } |
5185 | ||
d6f42150 | 5186 | /* lttng client socket path */ |
e6142f2e | 5187 | ret = chown(config.client_unix_sock_path.value, 0, gid); |
fac6795d | 5188 | if (ret < 0) { |
e6142f2e | 5189 | ERR("Unable to set group on %s", config.client_unix_sock_path.value); |
76d7553f | 5190 | PERROR("chown"); |
d6f42150 DG |
5191 | } |
5192 | ||
3bd1e081 | 5193 | /* kconsumer error socket path */ |
6c71277b | 5194 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 5195 | if (ret < 0) { |
3bd1e081 | 5196 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5197 | PERROR("chown"); |
3bd1e081 MD |
5198 | } |
5199 | ||
7753dea8 | 5200 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 5201 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
5202 | if (ret < 0) { |
5203 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5204 | PERROR("chown"); |
7753dea8 MD |
5205 | } |
5206 | ||
5207 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 5208 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 5209 | if (ret < 0) { |
7753dea8 | 5210 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5211 | PERROR("chown"); |
fac6795d DG |
5212 | } |
5213 | ||
d6f42150 | 5214 | DBG("All permissions are set"); |
e07ae692 | 5215 | |
fac6795d DG |
5216 | return ret; |
5217 | } | |
5218 | ||
d6f42150 | 5219 | /* |
d063d709 | 5220 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5221 | */ |
e6142f2e | 5222 | static int create_lttng_rundir(void) |
d6f42150 DG |
5223 | { |
5224 | int ret; | |
5225 | ||
e6142f2e | 5226 | DBG3("Creating LTTng run directory: %s", config.rundir.value); |
67e40797 | 5227 | |
e6142f2e | 5228 | ret = mkdir(config.rundir.value, S_IRWXU); |
d6f42150 | 5229 | if (ret < 0) { |
b1f11e69 | 5230 | if (errno != EEXIST) { |
e6142f2e | 5231 | ERR("Unable to create %s", config.rundir.value); |
b1f11e69 DG |
5232 | goto error; |
5233 | } else { | |
5234 | ret = 0; | |
5235 | } | |
d6f42150 DG |
5236 | } |
5237 | ||
5238 | error: | |
5239 | return ret; | |
5240 | } | |
5241 | ||
5242 | /* | |
e6142f2e | 5243 | * Setup sockets and directory needed by the consumerds' communication with the |
d063d709 | 5244 | * session daemon. |
d6f42150 | 5245 | */ |
e6142f2e | 5246 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
d6f42150 DG |
5247 | { |
5248 | int ret; | |
e6142f2e | 5249 | char *path = NULL; |
d6f42150 | 5250 | |
6c71277b | 5251 | switch (consumer_data->type) { |
7753dea8 | 5252 | case LTTNG_CONSUMER_KERNEL: |
e6142f2e | 5253 | path = config.kconsumerd_path.value; |
7753dea8 MD |
5254 | break; |
5255 | case LTTNG_CONSUMER64_UST: | |
e6142f2e | 5256 | path = config.consumerd64_path.value; |
7753dea8 MD |
5257 | break; |
5258 | case LTTNG_CONSUMER32_UST: | |
e6142f2e | 5259 | path = config.consumerd32_path.value; |
7753dea8 MD |
5260 | break; |
5261 | default: | |
5262 | ERR("Consumer type unknown"); | |
5263 | ret = -EINVAL; | |
5264 | goto error; | |
d6f42150 | 5265 | } |
e6142f2e | 5266 | assert(path); |
d6f42150 | 5267 | |
67e40797 DG |
5268 | DBG2("Creating consumer directory: %s", path); |
5269 | ||
6c71277b | 5270 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
e7e1ef17 JR |
5271 | if (ret < 0 && errno != EEXIST) { |
5272 | PERROR("mkdir"); | |
5273 | ERR("Failed to create %s", path); | |
5274 | goto error; | |
d6f42150 | 5275 | } |
6c71277b | 5276 | if (is_root) { |
e6142f2e | 5277 | ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value)); |
6c71277b MD |
5278 | if (ret < 0) { |
5279 | ERR("Unable to set group on %s", path); | |
5280 | PERROR("chown"); | |
5281 | goto error; | |
5282 | } | |
5283 | } | |
d6f42150 | 5284 | |
e6142f2e | 5285 | /* Create the consumerd error unix socket */ |
3bd1e081 MD |
5286 | consumer_data->err_sock = |
5287 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5288 | if (consumer_data->err_sock < 0) { | |
5289 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5290 | ret = -1; |
5291 | goto error; | |
5292 | } | |
5293 | ||
a24f05ab MD |
5294 | /* |
5295 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
5296 | * show must go on. | |
5297 | */ | |
5298 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
5299 | if (ret < 0) { | |
5300 | PERROR("utils_set_fd_cloexec"); | |
5301 | /* continue anyway */ | |
5302 | } | |
5303 | ||
d6f42150 | 5304 | /* File permission MUST be 660 */ |
3bd1e081 | 5305 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5306 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5307 | if (ret < 0) { |
3bd1e081 | 5308 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5309 | PERROR("chmod"); |
d6f42150 DG |
5310 | goto error; |
5311 | } | |
5312 | ||
5313 | error: | |
5314 | return ret; | |
5315 | } | |
5316 | ||
fac6795d | 5317 | /* |
d063d709 | 5318 | * Signal handler for the daemon |
cf3af59e | 5319 | * |
54d01ffb DG |
5320 | * Simply stop all worker threads, leaving main() return gracefully after |
5321 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5322 | */ |
5323 | static void sighandler(int sig) | |
5324 | { | |
5325 | switch (sig) { | |
cf3af59e | 5326 | case SIGINT: |
af87c45a | 5327 | DBG("SIGINT caught"); |
cf3af59e MD |
5328 | stop_threads(); |
5329 | break; | |
5330 | case SIGTERM: | |
af87c45a | 5331 | DBG("SIGTERM caught"); |
cf3af59e MD |
5332 | stop_threads(); |
5333 | break; | |
0bb7724a DG |
5334 | case SIGUSR1: |
5335 | CMM_STORE_SHARED(recv_child_signal, 1); | |
5336 | break; | |
cf3af59e MD |
5337 | default: |
5338 | break; | |
fac6795d | 5339 | } |
fac6795d DG |
5340 | } |
5341 | ||
5342 | /* | |
d063d709 | 5343 | * Setup signal handler for : |
1d4b027a | 5344 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5345 | */ |
1d4b027a | 5346 | static int set_signal_handler(void) |
fac6795d | 5347 | { |
1d4b027a DG |
5348 | int ret = 0; |
5349 | struct sigaction sa; | |
5350 | sigset_t sigset; | |
fac6795d | 5351 | |
1d4b027a | 5352 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5353 | PERROR("sigemptyset"); |
1d4b027a DG |
5354 | return ret; |
5355 | } | |
d6f42150 | 5356 | |
1d4b027a DG |
5357 | sa.sa_mask = sigset; |
5358 | sa.sa_flags = 0; | |
0072e5e2 MD |
5359 | |
5360 | sa.sa_handler = sighandler; | |
1d4b027a | 5361 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
76d7553f | 5362 | PERROR("sigaction"); |
1d4b027a | 5363 | return ret; |
d6f42150 DG |
5364 | } |
5365 | ||
1d4b027a | 5366 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5367 | PERROR("sigaction"); |
1d4b027a | 5368 | return ret; |
d6f42150 | 5369 | } |
aaf26714 | 5370 | |
0072e5e2 | 5371 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
76d7553f | 5372 | PERROR("sigaction"); |
1d4b027a | 5373 | return ret; |
8c0faa1d DG |
5374 | } |
5375 | ||
0072e5e2 MD |
5376 | sa.sa_handler = SIG_IGN; |
5377 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
0bb7724a DG |
5378 | PERROR("sigaction"); |
5379 | return ret; | |
5380 | } | |
5381 | ||
5382 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
5383 | |
5384 | return ret; | |
fac6795d DG |
5385 | } |
5386 | ||
f3ed775e | 5387 | /* |
d063d709 | 5388 | * Set open files limit to unlimited. This daemon can open a large number of |
514bb9f0 | 5389 | * file descriptors in order to consume multiple kernel traces. |
f3ed775e DG |
5390 | */ |
5391 | static void set_ulimit(void) | |
5392 | { | |
5393 | int ret; | |
5394 | struct rlimit lim; | |
5395 | ||
514bb9f0 | 5396 | /* The kernel does not allow an infinite limit for open files */ |
f3ed775e DG |
5397 | lim.rlim_cur = 65535; |
5398 | lim.rlim_max = 65535; | |
5399 | ||
5400 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5401 | if (ret < 0) { | |
76d7553f | 5402 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5403 | } |
5404 | } | |
5405 | ||
4a15001e | 5406 | static int write_pidfile(void) |
35f90c40 | 5407 | { |
e6142f2e | 5408 | return utils_create_pid_file(getpid(), config.pid_file_path.value); |
35f90c40 DG |
5409 | } |
5410 | ||
e6142f2e JG |
5411 | static int set_clock_plugin_env(void) |
5412 | { | |
5413 | int ret = 0; | |
5414 | char *env_value = NULL; | |
cd9290dd | 5415 | |
e6142f2e JG |
5416 | if (!config.lttng_ust_clock_plugin.value) { |
5417 | goto end; | |
5418 | } | |
5419 | ||
5420 | ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", | |
5421 | config.lttng_ust_clock_plugin.value); | |
cd9290dd | 5422 | if (ret < 0) { |
e6142f2e JG |
5423 | PERROR("asprintf"); |
5424 | goto end; | |
cd9290dd DG |
5425 | } |
5426 | ||
e6142f2e JG |
5427 | ret = putenv(env_value); |
5428 | if (ret) { | |
5429 | free(env_value); | |
5430 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); | |
5431 | goto end; | |
5432 | } | |
cd9290dd | 5433 | |
e6142f2e JG |
5434 | DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"", |
5435 | config.lttng_ust_clock_plugin.value); | |
5436 | end: | |
4a15001e | 5437 | return ret; |
ef367a93 JG |
5438 | } |
5439 | ||
99d688f2 JG |
5440 | static void destroy_all_sessions_and_wait(void) |
5441 | { | |
5442 | struct ltt_session *session, *tmp; | |
5443 | struct ltt_session_list *session_list; | |
5444 | ||
5445 | session_list = session_get_list(); | |
5446 | DBG("Initiating destruction of all sessions"); | |
5447 | ||
5448 | if (!session_list) { | |
5449 | return; | |
5450 | } | |
5451 | ||
5452 | /* | |
5453 | * Ensure that the client thread is no longer accepting new commands, | |
5454 | * which could cause new sessions to be created. | |
5455 | */ | |
5456 | sessiond_wait_client_thread_stopped(); | |
5457 | ||
5458 | session_lock_list(); | |
5459 | /* Initiate the destruction of all sessions. */ | |
5460 | cds_list_for_each_entry_safe(session, tmp, | |
5461 | &session_list->head, list) { | |
5462 | if (!session_get(session)) { | |
5463 | continue; | |
5464 | } | |
5465 | ||
5466 | session_lock(session); | |
5467 | if (session->destroyed) { | |
5468 | goto unlock_session; | |
5469 | } | |
5470 | (void) cmd_destroy_session(session, | |
5471 | notification_thread_handle); | |
5472 | unlock_session: | |
5473 | session_unlock(session); | |
5474 | session_put(session); | |
5475 | } | |
5476 | session_unlock_list(); | |
5477 | ||
5478 | /* Wait for the destruction of all sessions to complete. */ | |
5479 | DBG("Waiting for the destruction of all sessions to complete"); | |
5480 | session_list_wait_empty(); | |
5481 | DBG("Destruction of all sessions completed"); | |
5482 | } | |
5483 | ||
fac6795d DG |
5484 | /* |
5485 | * main | |
5486 | */ | |
5487 | int main(int argc, char **argv) | |
5488 | { | |
4a15001e | 5489 | int ret = 0, retval = 0; |
fac6795d | 5490 | void *status; |
e6142f2e | 5491 | const char *env_app_timeout; |
b3530820 JG |
5492 | struct lttng_pipe *ust32_channel_monitor_pipe = NULL, |
5493 | *ust64_channel_monitor_pipe = NULL, | |
5494 | *kernel_channel_monitor_pipe = NULL; | |
99611076 | 5495 | bool timer_thread_launched = false; |
a3707772 | 5496 | struct lttng_thread *ht_cleanup_thread = NULL; |
d086f507 | 5497 | struct timer_thread_parameters timer_thread_ctx; |
64d9b072 JG |
5498 | /* Rotation thread handle. */ |
5499 | struct rotation_thread_handle *rotation_thread_handle = NULL; | |
d086f507 JD |
5500 | /* Queue of rotation jobs populated by the sessiond-timer. */ |
5501 | struct rotation_thread_timer_queue *rotation_timer_queue = NULL; | |
fac6795d | 5502 | |
335a95b7 MD |
5503 | init_kernel_workarounds(); |
5504 | ||
f6a9efaa DG |
5505 | rcu_register_thread(); |
5506 | ||
4a15001e MD |
5507 | if (set_signal_handler()) { |
5508 | retval = -1; | |
5509 | goto exit_set_signal_handler; | |
0bb7724a DG |
5510 | } |
5511 | ||
92816cc3 | 5512 | if (timer_signal_init()) { |
d086f507 JD |
5513 | retval = -1; |
5514 | goto exit_set_signal_handler; | |
5515 | } | |
5516 | ||
12744796 DG |
5517 | page_size = sysconf(_SC_PAGESIZE); |
5518 | if (page_size < 0) { | |
5519 | PERROR("sysconf _SC_PAGESIZE"); | |
5520 | page_size = LONG_MAX; | |
5521 | WARN("Fallback page size to %ld", page_size); | |
5522 | } | |
5523 | ||
e6142f2e JG |
5524 | ret = sessiond_config_init(&config); |
5525 | if (ret) { | |
5526 | retval = -1; | |
5527 | goto exit_set_signal_handler; | |
5528 | } | |
5529 | ||
2788b494 JR |
5530 | /* |
5531 | * Init config from environment variables. | |
5532 | * Command line option override env configuration per-doc. Do env first. | |
5533 | */ | |
5534 | sessiond_config_apply_env_config(&config); | |
5535 | ||
4a15001e MD |
5536 | /* |
5537 | * Parse arguments and load the daemon configuration file. | |
5538 | * | |
5539 | * We have an exit_options exit path to free memory reserved by | |
5540 | * set_options. This is needed because the rest of sessiond_cleanup() | |
5541 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which | |
5542 | * depends on set_options. | |
5543 | */ | |
fac6795d | 5544 | progname = argv[0]; |
4a15001e MD |
5545 | if (set_options(argc, argv)) { |
5546 | retval = -1; | |
5547 | goto exit_options; | |
fac6795d DG |
5548 | } |
5549 | ||
e6142f2e JG |
5550 | /* |
5551 | * Resolve all paths received as arguments, configuration option, or | |
5552 | * through environment variable as absolute paths. This is necessary | |
5553 | * since daemonizing causes the sessiond's current working directory | |
5554 | * to '/'. | |
5555 | */ | |
5556 | ret = sessiond_config_resolve_paths(&config); | |
5557 | if (ret) { | |
5558 | goto exit_options; | |
5559 | } | |
5560 | ||
5561 | /* Apply config. */ | |
5562 | lttng_opt_verbose = config.verbose; | |
5563 | lttng_opt_quiet = config.quiet; | |
5564 | kconsumer_data.err_unix_sock_path = | |
5565 | config.kconsumerd_err_unix_sock_path.value; | |
5566 | kconsumer_data.cmd_unix_sock_path = | |
5567 | config.kconsumerd_cmd_unix_sock_path.value; | |
5568 | ustconsumer32_data.err_unix_sock_path = | |
5569 | config.consumerd32_err_unix_sock_path.value; | |
5570 | ustconsumer32_data.cmd_unix_sock_path = | |
5571 | config.consumerd32_cmd_unix_sock_path.value; | |
5572 | ustconsumer64_data.err_unix_sock_path = | |
5573 | config.consumerd64_err_unix_sock_path.value; | |
5574 | ustconsumer64_data.cmd_unix_sock_path = | |
5575 | config.consumerd64_cmd_unix_sock_path.value; | |
5576 | set_clock_plugin_env(); | |
5577 | ||
5578 | sessiond_config_log(&config); | |
5579 | ||
f472090a JG |
5580 | if (create_lttng_rundir()) { |
5581 | retval = -1; | |
5582 | goto exit_options; | |
5583 | } | |
5584 | ||
5585 | /* Abort launch if a session daemon is already running. */ | |
5586 | if (check_existing_daemon()) { | |
5587 | ERR("A session daemon is already running."); | |
5588 | retval = -1; | |
5589 | goto exit_options; | |
5590 | } | |
5591 | ||
fac6795d | 5592 | /* Daemonize */ |
e6142f2e | 5593 | if (config.daemonize || config.background) { |
ceed52b5 MD |
5594 | int i; |
5595 | ||
72dd7491 | 5596 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
e6142f2e | 5597 | !config.background); |
53094c05 | 5598 | if (ret < 0) { |
4a15001e MD |
5599 | retval = -1; |
5600 | goto exit_options; | |
53094c05 | 5601 | } |
0bb7724a | 5602 | |
ceed52b5 | 5603 | /* |
0bb7724a | 5604 | * We are in the child. Make sure all other file descriptors are |
4a15001e | 5605 | * closed, in case we are called with more opened file |
f472090a | 5606 | * descriptors than the standard ones and the lock file. |
ceed52b5 MD |
5607 | */ |
5608 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
f472090a JG |
5609 | if (i == lockfile_fd) { |
5610 | continue; | |
5611 | } | |
ceed52b5 MD |
5612 | (void) close(i); |
5613 | } | |
5614 | } | |
5615 | ||
7567352f MD |
5616 | if (run_as_create_worker(argv[0]) < 0) { |
5617 | goto exit_create_run_as_worker_cleanup; | |
5618 | } | |
5619 | ||
4a15001e MD |
5620 | /* |
5621 | * Starting from here, we can create threads. This needs to be after | |
5622 | * lttng_daemonize due to RCU. | |
5623 | */ | |
5624 | ||
5625 | /* | |
5626 | * Initialize the health check subsystem. This call should set the | |
5627 | * appropriate time values. | |
5628 | */ | |
5629 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); | |
5630 | if (!health_sessiond) { | |
5631 | PERROR("health_app_create error"); | |
5632 | retval = -1; | |
5633 | goto exit_health_sessiond_cleanup; | |
5634 | } | |
5635 | ||
4a15001e | 5636 | /* Create thread to clean up RCU hash tables */ |
a3707772 JG |
5637 | ht_cleanup_thread = launch_ht_cleanup_thread(); |
5638 | if (!ht_cleanup_thread) { | |
4a15001e MD |
5639 | retval = -1; |
5640 | goto exit_ht_cleanup; | |
5641 | } | |
5642 | ||
ceed52b5 | 5643 | /* Create thread quit pipe */ |
a7333da7 | 5644 | if (sessiond_init_thread_quit_pipe()) { |
4a15001e MD |
5645 | retval = -1; |
5646 | goto exit_init_data; | |
fac6795d DG |
5647 | } |
5648 | ||
5649 | /* Check if daemon is UID = 0 */ | |
5650 | is_root = !getuid(); | |
fac6795d | 5651 | if (is_root) { |
67e40797 | 5652 | /* Create global run dir with root access */ |
67e40797 | 5653 | |
b3530820 JG |
5654 | kernel_channel_monitor_pipe = lttng_pipe_open(0); |
5655 | if (!kernel_channel_monitor_pipe) { | |
5656 | ERR("Failed to create kernel consumer channel monitor pipe"); | |
5657 | retval = -1; | |
5658 | goto exit_init_data; | |
5659 | } | |
5660 | kconsumer_data.channel_monitor_pipe = | |
5661 | lttng_pipe_release_writefd( | |
5662 | kernel_channel_monitor_pipe); | |
5663 | if (kconsumer_data.channel_monitor_pipe < 0) { | |
5664 | retval = -1; | |
5665 | goto exit_init_data; | |
5666 | } | |
fac6795d DG |
5667 | } |
5668 | ||
5c827ce0 DG |
5669 | /* Set consumer initial state */ |
5670 | kernel_consumerd_state = CONSUMER_STOPPED; | |
5671 | ust_consumerd_state = CONSUMER_STOPPED; | |
5672 | ||
b3530820 JG |
5673 | ust32_channel_monitor_pipe = lttng_pipe_open(0); |
5674 | if (!ust32_channel_monitor_pipe) { | |
5675 | ERR("Failed to create 32-bit user space consumer channel monitor pipe"); | |
5676 | retval = -1; | |
5677 | goto exit_init_data; | |
5678 | } | |
5679 | ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
5680 | ust32_channel_monitor_pipe); | |
5681 | if (ustconsumer32_data.channel_monitor_pipe < 0) { | |
5682 | retval = -1; | |
5683 | goto exit_init_data; | |
5684 | } | |
62c43103 | 5685 | |
d086f507 | 5686 | /* |
92816cc3 JG |
5687 | * The rotation_thread_timer_queue structure is shared between the |
5688 | * sessiond timer thread and the rotation thread. The main thread keeps | |
5689 | * its ownership and destroys it when both threads have been joined. | |
d086f507 | 5690 | */ |
92816cc3 | 5691 | rotation_timer_queue = rotation_thread_timer_queue_create(); |
d086f507 JD |
5692 | if (!rotation_timer_queue) { |
5693 | retval = -1; | |
5694 | goto exit_init_data; | |
5695 | } | |
92816cc3 | 5696 | timer_thread_ctx.rotation_thread_job_queue = rotation_timer_queue; |
67e40797 | 5697 | |
b3530820 JG |
5698 | ust64_channel_monitor_pipe = lttng_pipe_open(0); |
5699 | if (!ust64_channel_monitor_pipe) { | |
5700 | ERR("Failed to create 64-bit user space consumer channel monitor pipe"); | |
5701 | retval = -1; | |
5702 | goto exit_init_data; | |
5703 | } | |
5704 | ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd( | |
5705 | ust64_channel_monitor_pipe); | |
5706 | if (ustconsumer64_data.channel_monitor_pipe < 0) { | |
5707 | retval = -1; | |
5708 | goto exit_init_data; | |
5709 | } | |
847177cd | 5710 | |
1427f9b2 DG |
5711 | /* |
5712 | * Init UST app hash table. Alloc hash table before this point since | |
5713 | * cleanup() can get called after that point. | |
5714 | */ | |
4a15001e | 5715 | if (ust_app_ht_alloc()) { |
ddbeb0f6 | 5716 | ERR("Failed to allocate UST app hash table"); |
4a15001e MD |
5717 | retval = -1; |
5718 | goto exit_init_data; | |
5719 | } | |
1427f9b2 | 5720 | |
6a4e4039 JG |
5721 | /* |
5722 | * Initialize agent app hash table. We allocate the hash table here | |
5723 | * since cleanup() can get called after this point. | |
5724 | */ | |
5725 | if (agent_app_ht_alloc()) { | |
5726 | ERR("Failed to allocate Agent app hash table"); | |
4a15001e MD |
5727 | retval = -1; |
5728 | goto exit_init_data; | |
f20baf8e DG |
5729 | } |
5730 | ||
a88df331 DG |
5731 | /* |
5732 | * These actions must be executed as root. We do that *after* setting up | |
5733 | * the sockets path because we MUST make the check for another daemon using | |
5734 | * those paths *before* trying to set the kernel consumer sockets and init | |
5735 | * kernel tracer. | |
5736 | */ | |
5737 | if (is_root) { | |
e6142f2e | 5738 | if (set_consumer_sockets(&kconsumer_data)) { |
4a15001e MD |
5739 | retval = -1; |
5740 | goto exit_init_data; | |
7753dea8 MD |
5741 | } |
5742 | ||
a88df331 | 5743 | /* Setup kernel tracer */ |
e6142f2e | 5744 | if (!config.no_kernel) { |
4fba7219 | 5745 | init_kernel_tracer(); |
89588270 DG |
5746 | if (kernel_tracer_fd >= 0) { |
5747 | ret = syscall_init_table(); | |
5748 | if (ret < 0) { | |
4a15001e MD |
5749 | ERR("Unable to populate syscall table. " |
5750 | "Syscall tracing won't work " | |
5751 | "for this session daemon."); | |
89588270 | 5752 | } |
834978fd | 5753 | } |
4fba7219 | 5754 | } |
a88df331 DG |
5755 | |
5756 | /* Set ulimit for open files */ | |
5757 | set_ulimit(); | |
fac6795d | 5758 | } |
4063050c MD |
5759 | /* init lttng_fd tracking must be done after set_ulimit. */ |
5760 | lttng_fd_init(); | |
fac6795d | 5761 | |
e6142f2e | 5762 | if (set_consumer_sockets(&ustconsumer64_data)) { |
4a15001e MD |
5763 | retval = -1; |
5764 | goto exit_init_data; | |
67e40797 DG |
5765 | } |
5766 | ||
e6142f2e | 5767 | if (set_consumer_sockets(&ustconsumer32_data)) { |
4a15001e MD |
5768 | retval = -1; |
5769 | goto exit_init_data; | |
67e40797 DG |
5770 | } |
5771 | ||
d6f42150 | 5772 | /* Setup the needed unix socket */ |
4a15001e MD |
5773 | if (init_daemon_socket()) { |
5774 | retval = -1; | |
5775 | goto exit_init_data; | |
fac6795d DG |
5776 | } |
5777 | ||
5778 | /* Set credentials to socket */ | |
e6142f2e | 5779 | if (is_root && set_permissions(config.rundir.value)) { |
4a15001e MD |
5780 | retval = -1; |
5781 | goto exit_init_data; | |
fac6795d DG |
5782 | } |
5783 | ||
5b8719f5 | 5784 | /* Get parent pid if -S, --sig-parent is specified. */ |
e6142f2e | 5785 | if (config.sig_parent) { |
5b8719f5 DG |
5786 | ppid = getppid(); |
5787 | } | |
5788 | ||
7a485870 | 5789 | /* Setup the kernel pipe for waking up the kernel thread */ |
e6142f2e | 5790 | if (is_root && !config.no_kernel) { |
4a15001e MD |
5791 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
5792 | retval = -1; | |
5793 | goto exit_init_data; | |
6620da75 | 5794 | } |
7a485870 DG |
5795 | } |
5796 | ||
099e26bd | 5797 | /* Setup the thread apps communication pipe. */ |
4a15001e MD |
5798 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
5799 | retval = -1; | |
5800 | goto exit_init_data; | |
099e26bd DG |
5801 | } |
5802 | ||
d0b96690 | 5803 | /* Setup the thread apps notify communication pipe. */ |
4a15001e MD |
5804 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
5805 | retval = -1; | |
5806 | goto exit_init_data; | |
d0b96690 DG |
5807 | } |
5808 | ||
7972aab2 DG |
5809 | /* Initialize global buffer per UID and PID registry. */ |
5810 | buffer_reg_init_uid_registry(); | |
5811 | buffer_reg_init_pid_registry(); | |
5812 | ||
099e26bd | 5813 | /* Init UST command queue. */ |
8bdee6e2 | 5814 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 5815 | |
2f77fc4b | 5816 | cmd_init(); |
00e2e675 | 5817 | |
ae9e45b3 DG |
5818 | /* Check for the application socket timeout env variable. */ |
5819 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
5820 | if (env_app_timeout) { | |
e6142f2e | 5821 | config.app_socket_timeout = atoi(env_app_timeout); |
ae9e45b3 | 5822 | } else { |
e6142f2e | 5823 | config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; |
ae9e45b3 DG |
5824 | } |
5825 | ||
4a15001e MD |
5826 | ret = write_pidfile(); |
5827 | if (ret) { | |
5828 | ERR("Error in write_pidfile"); | |
5829 | retval = -1; | |
5830 | goto exit_init_data; | |
5831 | } | |
35f90c40 | 5832 | |
554831e7 MD |
5833 | /* Initialize communication library */ |
5834 | lttcomm_init(); | |
4a15001e | 5835 | /* Initialize TCP timeout values */ |
d831c249 | 5836 | lttcomm_inet_init(); |
554831e7 | 5837 | |
ef367a93 | 5838 | if (load_session_init_data(&load_info) < 0) { |
4a15001e MD |
5839 | retval = -1; |
5840 | goto exit_init_data; | |
ef367a93 | 5841 | } |
e6142f2e | 5842 | load_info->path = config.load_session_path.value; |
ef367a93 | 5843 | |
12b4fb37 | 5844 | /* Create health-check thread. */ |
173fca4f | 5845 | if (!launch_health_management_thread()) { |
4a15001e | 5846 | retval = -1; |
44a5e5eb DG |
5847 | goto exit_health; |
5848 | } | |
5849 | ||
b3530820 JG |
5850 | /* notification_thread_data acquires the pipes' read side. */ |
5851 | notification_thread_handle = notification_thread_handle_create( | |
5852 | ust32_channel_monitor_pipe, | |
5853 | ust64_channel_monitor_pipe, | |
c8a9de5a | 5854 | kernel_channel_monitor_pipe); |
b3530820 JG |
5855 | if (!notification_thread_handle) { |
5856 | retval = -1; | |
5857 | ERR("Failed to create notification thread shared data"); | |
b3530820 JG |
5858 | goto exit_notification; |
5859 | } | |
5860 | ||
5861 | /* Create notification thread. */ | |
c8a9de5a | 5862 | if (!launch_notification_thread(notification_thread_handle)) { |
b3530820 | 5863 | retval = -1; |
b3530820 | 5864 | goto exit_notification; |
c8a9de5a | 5865 | |
b3530820 JG |
5866 | } |
5867 | ||
d086f507 JD |
5868 | /* Create timer thread. */ |
5869 | ret = pthread_create(&timer_thread, default_pthread_attr(), | |
92816cc3 | 5870 | timer_thread_func, &timer_thread_ctx); |
d086f507 JD |
5871 | if (ret) { |
5872 | errno = ret; | |
5873 | PERROR("pthread_create timer"); | |
5874 | retval = -1; | |
5875 | stop_threads(); | |
5876 | goto exit_notification; | |
5877 | } | |
99611076 | 5878 | timer_thread_launched = true; |
d086f507 | 5879 | |
db66e574 JD |
5880 | /* rotation_thread_data acquires the pipes' read side. */ |
5881 | rotation_thread_handle = rotation_thread_handle_create( | |
90936dcf | 5882 | rotation_timer_queue, |
c8a9de5a | 5883 | notification_thread_handle); |
db66e574 JD |
5884 | if (!rotation_thread_handle) { |
5885 | retval = -1; | |
5886 | ERR("Failed to create rotation thread shared data"); | |
5887 | stop_threads(); | |
5888 | goto exit_rotation; | |
5889 | } | |
db66e574 JD |
5890 | |
5891 | /* Create rotation thread. */ | |
64d9b072 | 5892 | if (!launch_rotation_thread(rotation_thread_handle)) { |
db66e574 | 5893 | retval = -1; |
db66e574 JD |
5894 | goto exit_rotation; |
5895 | } | |
5896 | ||
cf3af59e | 5897 | /* Create thread to manage the client socket */ |
1a1a34b4 | 5898 | ret = pthread_create(&client_thread, default_pthread_attr(), |
099e26bd | 5899 | thread_manage_clients, (void *) NULL); |
4a15001e MD |
5900 | if (ret) { |
5901 | errno = ret; | |
76d7553f | 5902 | PERROR("pthread_create clients"); |
4a15001e | 5903 | retval = -1; |
b3530820 | 5904 | stop_threads(); |
cf3af59e MD |
5905 | goto exit_client; |
5906 | } | |
fac6795d | 5907 | |
099e26bd | 5908 | /* Create thread to dispatch registration */ |
1a1a34b4 | 5909 | ret = pthread_create(&dispatch_thread, default_pthread_attr(), |
099e26bd | 5910 | thread_dispatch_ust_registration, (void *) NULL); |
4a15001e MD |
5911 | if (ret) { |
5912 | errno = ret; | |
76d7553f | 5913 | PERROR("pthread_create dispatch"); |
4a15001e | 5914 | retval = -1; |
b3530820 | 5915 | stop_threads(); |
099e26bd DG |
5916 | goto exit_dispatch; |
5917 | } | |
5918 | ||
5919 | /* Create thread to manage application registration. */ | |
1a1a34b4 | 5920 | ret = pthread_create(®_apps_thread, default_pthread_attr(), |
099e26bd | 5921 | thread_registration_apps, (void *) NULL); |
4a15001e MD |
5922 | if (ret) { |
5923 | errno = ret; | |
76d7553f | 5924 | PERROR("pthread_create registration"); |
4a15001e | 5925 | retval = -1; |
b3530820 | 5926 | stop_threads(); |
099e26bd DG |
5927 | goto exit_reg_apps; |
5928 | } | |
5929 | ||
cf3af59e | 5930 | /* Create thread to manage application socket */ |
1a1a34b4 | 5931 | ret = pthread_create(&apps_thread, default_pthread_attr(), |
54d01ffb | 5932 | thread_manage_apps, (void *) NULL); |
4a15001e MD |
5933 | if (ret) { |
5934 | errno = ret; | |
d0b96690 | 5935 | PERROR("pthread_create apps"); |
4a15001e | 5936 | retval = -1; |
b3530820 | 5937 | stop_threads(); |
d0b96690 DG |
5938 | goto exit_apps; |
5939 | } | |
5940 | ||
5941 | /* Create thread to manage application notify socket */ | |
1a1a34b4 | 5942 | ret = pthread_create(&apps_notify_thread, default_pthread_attr(), |
d0b96690 | 5943 | ust_thread_manage_notify, (void *) NULL); |
4a15001e MD |
5944 | if (ret) { |
5945 | errno = ret; | |
f5c32ef1 | 5946 | PERROR("pthread_create notify"); |
4a15001e | 5947 | retval = -1; |
b3530820 | 5948 | stop_threads(); |
9563b0ad | 5949 | goto exit_apps_notify; |
cf3af59e | 5950 | } |
fac6795d | 5951 | |
022d91ba | 5952 | /* Create agent registration thread. */ |
1a1a34b4 | 5953 | ret = pthread_create(&agent_reg_thread, default_pthread_attr(), |
022d91ba | 5954 | agent_thread_manage_registration, (void *) NULL); |
4a15001e MD |
5955 | if (ret) { |
5956 | errno = ret; | |
022d91ba | 5957 | PERROR("pthread_create agent"); |
4a15001e | 5958 | retval = -1; |
b3530820 | 5959 | stop_threads(); |
022d91ba | 5960 | goto exit_agent_reg; |
4d076222 DG |
5961 | } |
5962 | ||
6620da75 | 5963 | /* Don't start this thread if kernel tracing is not requested nor root */ |
e6142f2e | 5964 | if (is_root && !config.no_kernel) { |
6620da75 | 5965 | /* Create kernel thread to manage kernel event */ |
1a1a34b4 | 5966 | ret = pthread_create(&kernel_thread, default_pthread_attr(), |
6620da75 | 5967 | thread_manage_kernel, (void *) NULL); |
4a15001e MD |
5968 | if (ret) { |
5969 | errno = ret; | |
6620da75 | 5970 | PERROR("pthread_create kernel"); |
4a15001e | 5971 | retval = -1; |
b3530820 | 5972 | stop_threads(); |
6620da75 DG |
5973 | goto exit_kernel; |
5974 | } | |
ef367a93 | 5975 | } |
7a485870 | 5976 | |
4a15001e | 5977 | /* Create session loading thread. */ |
1a1a34b4 MJ |
5978 | ret = pthread_create(&load_session_thread, default_pthread_attr(), |
5979 | thread_load_session, load_info); | |
4a15001e MD |
5980 | if (ret) { |
5981 | errno = ret; | |
5982 | PERROR("pthread_create load_session_thread"); | |
5983 | retval = -1; | |
b3530820 | 5984 | stop_threads(); |
4a15001e MD |
5985 | goto exit_load_session; |
5986 | } | |
5987 | ||
5988 | /* | |
5989 | * This is where we start awaiting program completion (e.g. through | |
5990 | * signal that asks threads to teardown). | |
5991 | */ | |
5992 | ||
5993 | ret = pthread_join(load_session_thread, &status); | |
5994 | if (ret) { | |
5995 | errno = ret; | |
5996 | PERROR("pthread_join load_session_thread"); | |
5997 | retval = -1; | |
5998 | } | |
99d688f2 JG |
5999 | |
6000 | /* Initiate teardown once activity occurs on the quit pipe. */ | |
6001 | sessiond_wait_for_quit_pipe(-1U); | |
6002 | destroy_all_sessions_and_wait(); | |
4a15001e | 6003 | exit_load_session: |
ef367a93 | 6004 | |
e6142f2e | 6005 | if (is_root && !config.no_kernel) { |
6620da75 | 6006 | ret = pthread_join(kernel_thread, &status); |
4a15001e MD |
6007 | if (ret) { |
6008 | errno = ret; | |
6620da75 | 6009 | PERROR("pthread_join"); |
4a15001e | 6010 | retval = -1; |
6620da75 | 6011 | } |
fac6795d | 6012 | } |
cf3af59e | 6013 | exit_kernel: |
4a15001e | 6014 | |
022d91ba | 6015 | ret = pthread_join(agent_reg_thread, &status); |
4a15001e MD |
6016 | if (ret) { |
6017 | errno = ret; | |
022d91ba | 6018 | PERROR("pthread_join agent"); |
4a15001e | 6019 | retval = -1; |
4d076222 | 6020 | } |
022d91ba | 6021 | exit_agent_reg: |
4a15001e | 6022 | |
9563b0ad | 6023 | ret = pthread_join(apps_notify_thread, &status); |
4a15001e MD |
6024 | if (ret) { |
6025 | errno = ret; | |
9563b0ad | 6026 | PERROR("pthread_join apps notify"); |
4a15001e | 6027 | retval = -1; |
9563b0ad | 6028 | } |
9563b0ad | 6029 | exit_apps_notify: |
4a15001e | 6030 | |
cf3af59e | 6031 | ret = pthread_join(apps_thread, &status); |
4a15001e MD |
6032 | if (ret) { |
6033 | errno = ret; | |
9563b0ad | 6034 | PERROR("pthread_join apps"); |
4a15001e | 6035 | retval = -1; |
cf3af59e | 6036 | } |
cf3af59e | 6037 | exit_apps: |
4a15001e | 6038 | |
099e26bd | 6039 | ret = pthread_join(reg_apps_thread, &status); |
4a15001e MD |
6040 | if (ret) { |
6041 | errno = ret; | |
76d7553f | 6042 | PERROR("pthread_join"); |
4a15001e | 6043 | retval = -1; |
099e26bd | 6044 | } |
099e26bd | 6045 | exit_reg_apps: |
4a15001e | 6046 | |
772b8f4d MD |
6047 | /* |
6048 | * Join dispatch thread after joining reg_apps_thread to ensure | |
6049 | * we don't leak applications in the queue. | |
6050 | */ | |
099e26bd | 6051 | ret = pthread_join(dispatch_thread, &status); |
4a15001e MD |
6052 | if (ret) { |
6053 | errno = ret; | |
76d7553f | 6054 | PERROR("pthread_join"); |
4a15001e | 6055 | retval = -1; |
099e26bd | 6056 | } |
099e26bd | 6057 | exit_dispatch: |
4a15001e | 6058 | |
cf3af59e | 6059 | ret = pthread_join(client_thread, &status); |
4a15001e MD |
6060 | if (ret) { |
6061 | errno = ret; | |
76d7553f | 6062 | PERROR("pthread_join"); |
4a15001e | 6063 | retval = -1; |
cf3af59e | 6064 | } |
a88df331 | 6065 | |
b3530820 | 6066 | exit_client: |
db66e574 | 6067 | exit_rotation: |
b3530820 | 6068 | exit_notification: |
a3707772 | 6069 | lttng_thread_list_shutdown_orphans(); |
b3530820 | 6070 | exit_health: |
4a15001e | 6071 | exit_init_data: |
4d62fbf8 MD |
6072 | /* |
6073 | * Wait for all pending call_rcu work to complete before tearing | |
6074 | * down data structures. call_rcu worker may be trying to | |
6075 | * perform lookups in those structures. | |
6076 | */ | |
6077 | rcu_barrier(); | |
4a15001e MD |
6078 | /* |
6079 | * sessiond_cleanup() is called when no other thread is running, except | |
6080 | * the ht_cleanup thread, which is needed to destroy the hash tables. | |
6081 | */ | |
6082 | rcu_thread_online(); | |
6083 | sessiond_cleanup(); | |
06f525de | 6084 | |
c4d5de9d JG |
6085 | /* |
6086 | * Ensure all prior call_rcu are done. call_rcu callbacks may push | |
6087 | * hash tables to the ht_cleanup thread. Therefore, we ensure that | |
6088 | * the queue is empty before shutting down the clean-up thread. | |
6089 | */ | |
6090 | rcu_barrier(); | |
6091 | ||
99611076 | 6092 | if (timer_thread_launched) { |
92816cc3 | 6093 | timer_exit(); |
d086f507 JD |
6094 | ret = pthread_join(timer_thread, &status); |
6095 | if (ret) { | |
6096 | errno = ret; | |
6097 | PERROR("pthread_join timer thread"); | |
6098 | retval = -1; | |
6099 | } | |
6100 | } | |
6101 | ||
a3707772 JG |
6102 | if (ht_cleanup_thread) { |
6103 | lttng_thread_shutdown(ht_cleanup_thread); | |
6104 | lttng_thread_put(ht_cleanup_thread); | |
6105 | } | |
6106 | ||
64d9b072 JG |
6107 | rcu_thread_offline(); |
6108 | rcu_unregister_thread(); | |
6109 | ||
6110 | if (rotation_thread_handle) { | |
6111 | rotation_thread_handle_destroy(rotation_thread_handle); | |
6112 | } | |
6113 | ||
d086f507 JD |
6114 | /* |
6115 | * After the rotation and timer thread have quit, we can safely destroy | |
6116 | * the rotation_timer_queue. | |
6117 | */ | |
92816cc3 | 6118 | rotation_thread_timer_queue_destroy(rotation_timer_queue); |
c8a9de5a JG |
6119 | /* |
6120 | * The teardown of the notification system is performed after the | |
6121 | * session daemon's teardown in order to allow it to be notified | |
6122 | * of the active session and channels at the moment of the teardown. | |
6123 | */ | |
6124 | if (notification_thread_handle) { | |
6125 | notification_thread_handle_destroy(notification_thread_handle); | |
6126 | } | |
b3530820 JG |
6127 | lttng_pipe_destroy(ust32_channel_monitor_pipe); |
6128 | lttng_pipe_destroy(ust64_channel_monitor_pipe); | |
6129 | lttng_pipe_destroy(kernel_channel_monitor_pipe); | |
0b2dc8df | 6130 | exit_ht_cleanup: |
4a15001e | 6131 | |
4a15001e MD |
6132 | health_app_destroy(health_sessiond); |
6133 | exit_health_sessiond_cleanup: | |
7567352f | 6134 | exit_create_run_as_worker_cleanup: |
4a15001e MD |
6135 | |
6136 | exit_options: | |
f472090a | 6137 | sessiond_cleanup_lock_file(); |
4a15001e MD |
6138 | sessiond_cleanup_options(); |
6139 | ||
6140 | exit_set_signal_handler: | |
6141 | if (!retval) { | |
cf3af59e | 6142 | exit(EXIT_SUCCESS); |
4a15001e MD |
6143 | } else { |
6144 | exit(EXIT_FAILURE); | |
67e40797 | 6145 | } |
fac6795d | 6146 | } |