Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
26296c48 | 4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
fac6795d | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
91d76f53 | 9 | * |
d14d33bf AM |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
fac6795d DG |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
6c1c0768 | 21 | #define _LGPL_SOURCE |
fac6795d DG |
22 | #include <getopt.h> |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
0bb7724a | 25 | #include <paths.h> |
fac6795d DG |
26 | #include <pthread.h> |
27 | #include <signal.h> | |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
331744e3 | 31 | #include <inttypes.h> |
0fdd1e2c | 32 | #include <sys/mman.h> |
b73401da | 33 | #include <sys/mount.h> |
1e307fab | 34 | #include <sys/resource.h> |
fac6795d DG |
35 | #include <sys/socket.h> |
36 | #include <sys/stat.h> | |
37 | #include <sys/types.h> | |
0fdd1e2c | 38 | #include <sys/wait.h> |
5c827ce0 | 39 | #include <urcu/uatomic.h> |
fac6795d | 40 | #include <unistd.h> |
3bd1e081 | 41 | #include <config.h> |
fac6795d | 42 | |
990570ed | 43 | #include <common/common.h> |
d27c42b8 | 44 | #include <common/compat/socket.h> |
e8fa9fb0 | 45 | #include <common/compat/getenv.h> |
db758600 DG |
46 | #include <common/defaults.h> |
47 | #include <common/kernel-consumer/kernel-consumer.h> | |
50c8f484 | 48 | #include <common/futex.h> |
00e2e675 | 49 | #include <common/relayd/relayd.h> |
81b86775 | 50 | #include <common/utils.h> |
3ccdf997 | 51 | #include <common/daemonize.h> |
26296c48 | 52 | #include <common/config/config.h> |
fac6795d | 53 | |
10a8a223 | 54 | #include "lttng-sessiond.h" |
7972aab2 | 55 | #include "buffer-registry.h" |
54d01ffb | 56 | #include "channel.h" |
2f77fc4b | 57 | #include "cmd.h" |
00e2e675 | 58 | #include "consumer.h" |
099e26bd | 59 | #include "context.h" |
54d01ffb | 60 | #include "event.h" |
4771f025 | 61 | #include "kernel.h" |
f1e16794 | 62 | #include "kernel-consumer.h" |
096102bd | 63 | #include "modprobe.h" |
0fdd1e2c | 64 | #include "shm.h" |
1e307fab | 65 | #include "ust-ctl.h" |
00e2e675 | 66 | #include "ust-consumer.h" |
8e68d1c8 | 67 | #include "utils.h" |
4063050c | 68 | #include "fd-limit.h" |
8782cc74 | 69 | #include "health-sessiond.h" |
8ac94142 | 70 | #include "testpoint.h" |
d0b96690 | 71 | #include "ust-thread.h" |
022d91ba | 72 | #include "agent-thread.h" |
fb198a11 | 73 | #include "save.h" |
ef367a93 | 74 | #include "load-session-thread.h" |
834978fd | 75 | #include "syscall.h" |
fac6795d | 76 | |
ebaeda94 MD |
77 | #define CONSUMERD_FILE "lttng-consumerd" |
78 | ||
fac6795d | 79 | const char *progname; |
6c71277b | 80 | static const char *tracing_group_name = DEFAULT_TRACING_GROUP; |
26296c48 JG |
81 | static int tracing_group_name_override; |
82 | static char *opt_pidfile; | |
5b8719f5 | 83 | static int opt_sig_parent; |
97e19046 | 84 | static int opt_verbose_consumer; |
72dd7491 | 85 | static int opt_daemon, opt_background; |
4fba7219 | 86 | static int opt_no_kernel; |
ef367a93 | 87 | static char *opt_load_session_path; |
1d4b027a | 88 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
0bb7724a | 89 | static pid_t child_ppid; /* Internal parent PID use with daemonize. */ |
67e40797 | 90 | static char *rundir; |
c9cb3e7d | 91 | static int lockfile_fd = -1; |
3bd1e081 | 92 | |
0bb7724a DG |
93 | /* Set to 1 when a SIGUSR1 signal is received. */ |
94 | static int recv_child_signal; | |
95 | ||
a23ec3a7 DG |
96 | /* |
97 | * Consumer daemon specific control data. Every value not initialized here is | |
98 | * set to 0 by the static definition. | |
99 | */ | |
3bd1e081 MD |
100 | static struct consumer_data kconsumer_data = { |
101 | .type = LTTNG_CONSUMER_KERNEL, | |
60922cb0 DG |
102 | .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH, |
103 | .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH, | |
03550b58 MD |
104 | .err_sock = -1, |
105 | .cmd_sock = -1, | |
173af62f DG |
106 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
107 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
108 | .cond = PTHREAD_COND_INITIALIZER, |
109 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 | 110 | }; |
7753dea8 MD |
111 | static struct consumer_data ustconsumer64_data = { |
112 | .type = LTTNG_CONSUMER64_UST, | |
60922cb0 DG |
113 | .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, |
114 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, | |
03550b58 MD |
115 | .err_sock = -1, |
116 | .cmd_sock = -1, | |
173af62f DG |
117 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
118 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
119 | .cond = PTHREAD_COND_INITIALIZER, |
120 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
7753dea8 MD |
121 | }; |
122 | static struct consumer_data ustconsumer32_data = { | |
123 | .type = LTTNG_CONSUMER32_UST, | |
60922cb0 DG |
124 | .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, |
125 | .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, | |
03550b58 MD |
126 | .err_sock = -1, |
127 | .cmd_sock = -1, | |
173af62f DG |
128 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
129 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
a23ec3a7 DG |
130 | .cond = PTHREAD_COND_INITIALIZER, |
131 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, | |
3bd1e081 MD |
132 | }; |
133 | ||
26296c48 JG |
134 | /* Command line options */ |
135 | static const struct option long_options[] = { | |
136 | { "client-sock", 1, 0, 'c' }, | |
137 | { "apps-sock", 1, 0, 'a' }, | |
138 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, | |
139 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
140 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, | |
141 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
142 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, | |
143 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
144 | { "consumerd32-path", 1, 0, 'u' }, | |
145 | { "consumerd32-libdir", 1, 0, 'U' }, | |
146 | { "consumerd64-path", 1, 0, 't' }, | |
147 | { "consumerd64-libdir", 1, 0, 'T' }, | |
148 | { "daemonize", 0, 0, 'd' }, | |
72dd7491 | 149 | { "background", 0, 0, 'b' }, |
26296c48 JG |
150 | { "sig-parent", 0, 0, 'S' }, |
151 | { "help", 0, 0, 'h' }, | |
152 | { "group", 1, 0, 'g' }, | |
153 | { "version", 0, 0, 'V' }, | |
154 | { "quiet", 0, 0, 'q' }, | |
155 | { "verbose", 0, 0, 'v' }, | |
156 | { "verbose-consumer", 0, 0, 'Z' }, | |
157 | { "no-kernel", 0, 0, 'N' }, | |
158 | { "pidfile", 1, 0, 'p' }, | |
1b2ef7fe | 159 | { "agent-tcp-port", 1, 0, 'J' }, |
26296c48 | 160 | { "config", 1, 0, 'f' }, |
ef367a93 | 161 | { "load", 1, 0, 'l' }, |
fbb9748b | 162 | { "kmod-probes", 1, 0, 'P' }, |
c9d42407 | 163 | { "extra-kmod-probes", 1, 0, 'e' }, |
26296c48 JG |
164 | { NULL, 0, 0, 0 } |
165 | }; | |
166 | ||
167 | /* Command line options to ignore from configuration file */ | |
168 | static const char *config_ignore_options[] = { "help", "version", "config" }; | |
169 | ||
26c9d55e | 170 | /* Shared between threads */ |
099e26bd | 171 | static int dispatch_thread_exit; |
fac6795d | 172 | |
54d01ffb DG |
173 | /* Global application Unix socket path */ |
174 | static char apps_unix_sock_path[PATH_MAX]; | |
175 | /* Global client Unix socket path */ | |
176 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
177 | /* global wait shm path for UST */ |
178 | static char wait_shm_path[PATH_MAX]; | |
44a5e5eb DG |
179 | /* Global health check unix path */ |
180 | static char health_unix_sock_path[PATH_MAX]; | |
fac6795d | 181 | |
1d4b027a | 182 | /* Sockets and FDs */ |
a4b35e07 MD |
183 | static int client_sock = -1; |
184 | static int apps_sock = -1; | |
2f77fc4b | 185 | int kernel_tracer_fd = -1; |
76d7553f | 186 | static int kernel_poll_pipe[2] = { -1, -1 }; |
1d4b027a | 187 | |
273ea72c DG |
188 | /* |
189 | * Quit pipe for all threads. This permits a single cancellation point | |
190 | * for all threads when receiving an event on the pipe. | |
191 | */ | |
76d7553f | 192 | static int thread_quit_pipe[2] = { -1, -1 }; |
4a15001e | 193 | static int ht_cleanup_quit_pipe[2] = { -1, -1 }; |
273ea72c | 194 | |
099e26bd DG |
195 | /* |
196 | * This pipe is used to inform the thread managing application communication | |
197 | * that a command is queued and ready to be processed. | |
198 | */ | |
76d7553f | 199 | static int apps_cmd_pipe[2] = { -1, -1 }; |
099e26bd | 200 | |
d0b96690 DG |
201 | int apps_cmd_notify_pipe[2] = { -1, -1 }; |
202 | ||
1d4b027a | 203 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 204 | static pthread_t apps_thread; |
d0b96690 | 205 | static pthread_t apps_notify_thread; |
099e26bd | 206 | static pthread_t reg_apps_thread; |
1d4b027a | 207 | static pthread_t client_thread; |
7a485870 | 208 | static pthread_t kernel_thread; |
099e26bd | 209 | static pthread_t dispatch_thread; |
44a5e5eb | 210 | static pthread_t health_thread; |
0b2dc8df | 211 | static pthread_t ht_cleanup_thread; |
022d91ba | 212 | static pthread_t agent_reg_thread; |
ef367a93 | 213 | static pthread_t load_session_thread; |
5eb91c98 | 214 | |
099e26bd DG |
215 | /* |
216 | * UST registration command queue. This queue is tied with a futex and uses a N | |
217 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
218 | * | |
b22c5da8 DG |
219 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
220 | * queue along with the wait/wake scheme. The thread_manage_apps receives down | |
221 | * the line new application socket and monitors it for any I/O error or clean | |
222 | * close that triggers an unregistration of the application. | |
099e26bd DG |
223 | */ |
224 | static struct ust_cmd_queue ust_cmd_queue; | |
225 | ||
b5541356 DG |
226 | /* |
227 | * Pointer initialized before thread creation. | |
228 | * | |
229 | * This points to the tracing session list containing the session count and a | |
230 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
231 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 232 | * |
d063d709 | 233 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 234 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
235 | */ |
236 | static struct ltt_session_list *session_list_ptr; | |
237 | ||
7753dea8 MD |
238 | int ust_consumerd64_fd = -1; |
239 | int ust_consumerd32_fd = -1; | |
240 | ||
fb6f1fa2 YB |
241 | static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN; |
242 | static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN; | |
243 | static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR; | |
244 | static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR; | |
26296c48 JG |
245 | static int consumerd32_bin_override; |
246 | static int consumerd64_bin_override; | |
247 | static int consumerd32_libdir_override; | |
248 | static int consumerd64_libdir_override; | |
fb09408a | 249 | |
2f77fc4b DG |
250 | static const char *module_proc_lttng = "/proc/lttng"; |
251 | ||
5c827ce0 DG |
252 | /* |
253 | * Consumer daemon state which is changed when spawning it, killing it or in | |
254 | * case of a fatal error. | |
255 | */ | |
256 | enum consumerd_state { | |
257 | CONSUMER_STARTED = 1, | |
258 | CONSUMER_STOPPED = 2, | |
259 | CONSUMER_ERROR = 3, | |
260 | }; | |
261 | ||
262 | /* | |
263 | * This consumer daemon state is used to validate if a client command will be | |
264 | * able to reach the consumer. If not, the client is informed. For instance, | |
265 | * doing a "lttng start" when the consumer state is set to ERROR will return an | |
266 | * error to the client. | |
267 | * | |
268 | * The following example shows a possible race condition of this scheme: | |
269 | * | |
270 | * consumer thread error happens | |
271 | * client cmd arrives | |
272 | * client cmd checks state -> still OK | |
273 | * consumer thread exit, sets error | |
274 | * client cmd try to talk to consumer | |
275 | * ... | |
276 | * | |
277 | * However, since the consumer is a different daemon, we have no way of making | |
278 | * sure the command will reach it safely even with this state flag. This is why | |
279 | * we consider that up to the state validation during command processing, the | |
280 | * command is safe. After that, we can not guarantee the correctness of the | |
281 | * client request vis-a-vis the consumer. | |
282 | */ | |
283 | static enum consumerd_state ust_consumerd_state; | |
284 | static enum consumerd_state kernel_consumerd_state; | |
285 | ||
ae9e45b3 DG |
286 | /* |
287 | * Socket timeout for receiving and sending in seconds. | |
288 | */ | |
289 | static int app_socket_timeout; | |
290 | ||
12744796 DG |
291 | /* Set in main() with the current page size. */ |
292 | long page_size; | |
293 | ||
8782cc74 MD |
294 | /* Application health monitoring */ |
295 | struct health_app *health_sessiond; | |
296 | ||
022d91ba DG |
297 | /* Agent TCP port for registration. Used by the agent thread. */ |
298 | unsigned int agent_tcp_port = DEFAULT_AGENT_TCP_PORT; | |
4d076222 | 299 | |
f43f95a9 DG |
300 | /* Am I root or not. */ |
301 | int is_root; /* Set to 1 if the daemon is running as root */ | |
302 | ||
26296c48 JG |
303 | const char * const config_section_name = "sessiond"; |
304 | ||
ef367a93 JG |
305 | /* Load session thread information to operate. */ |
306 | struct load_session_thread_data *load_info; | |
307 | ||
97bc1426 MD |
308 | /* |
309 | * Whether sessiond is ready for commands/health check requests. | |
310 | * NR_LTTNG_SESSIOND_READY must match the number of calls to | |
ef367a93 | 311 | * sessiond_notify_ready(). |
97bc1426 | 312 | */ |
ef367a93 | 313 | #define NR_LTTNG_SESSIOND_READY 3 |
97bc1426 MD |
314 | int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY; |
315 | ||
316 | /* Notify parents that we are ready for cmd and health check */ | |
ef367a93 JG |
317 | LTTNG_HIDDEN |
318 | void sessiond_notify_ready(void) | |
97bc1426 MD |
319 | { |
320 | if (uatomic_sub_return(<tng_sessiond_ready, 1) == 0) { | |
321 | /* | |
322 | * Notify parent pid that we are ready to accept command | |
323 | * for client side. This ppid is the one from the | |
324 | * external process that spawned us. | |
325 | */ | |
326 | if (opt_sig_parent) { | |
327 | kill(ppid, SIGUSR1); | |
328 | } | |
329 | ||
330 | /* | |
331 | * Notify the parent of the fork() process that we are | |
332 | * ready. | |
333 | */ | |
72dd7491 | 334 | if (opt_daemon || opt_background) { |
97bc1426 MD |
335 | kill(child_ppid, SIGUSR1); |
336 | } | |
337 | } | |
338 | } | |
339 | ||
fb09408a | 340 | static |
7753dea8 | 341 | void setup_consumerd_path(void) |
fb09408a | 342 | { |
fc7a59ce | 343 | const char *bin, *libdir; |
fb09408a | 344 | |
7753dea8 MD |
345 | /* |
346 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
347 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
348 | * has not been defined. | |
7753dea8 | 349 | */ |
ebaeda94 | 350 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
351 | if (!consumerd32_bin[0]) { |
352 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
353 | } |
354 | if (!consumerd32_libdir[0]) { | |
355 | consumerd32_libdir = INSTALL_LIB_PATH; | |
356 | } | |
357 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
358 | if (!consumerd64_bin[0]) { |
359 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 360 | } |
ebaeda94 MD |
361 | if (!consumerd64_libdir[0]) { |
362 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
363 | } |
364 | #else | |
365 | #error "Unknown bitness" | |
366 | #endif | |
367 | ||
fb09408a MD |
368 | /* |
369 | * runtime env. var. overrides the build default. | |
370 | */ | |
e8fa9fb0 | 371 | bin = lttng_secure_getenv("LTTNG_CONSUMERD32_BIN"); |
fc7a59ce AM |
372 | if (bin) { |
373 | consumerd32_bin = bin; | |
7753dea8 | 374 | } |
e8fa9fb0 | 375 | bin = lttng_secure_getenv("LTTNG_CONSUMERD64_BIN"); |
fc7a59ce AM |
376 | if (bin) { |
377 | consumerd64_bin = bin; | |
ebaeda94 | 378 | } |
e8fa9fb0 | 379 | libdir = lttng_secure_getenv("LTTNG_CONSUMERD32_LIBDIR"); |
ebaeda94 MD |
380 | if (libdir) { |
381 | consumerd32_libdir = libdir; | |
382 | } | |
e8fa9fb0 | 383 | libdir = lttng_secure_getenv("LTTNG_CONSUMERD64_LIBDIR"); |
ebaeda94 MD |
384 | if (libdir) { |
385 | consumerd64_libdir = libdir; | |
fb09408a MD |
386 | } |
387 | } | |
388 | ||
4a15001e MD |
389 | static |
390 | int __sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size, | |
391 | int *a_pipe) | |
5eb91c98 DG |
392 | { |
393 | int ret; | |
394 | ||
d0b96690 | 395 | assert(events); |
5eb91c98 DG |
396 | |
397 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
398 | if (ret < 0) { | |
399 | goto error; | |
400 | } | |
401 | ||
402 | /* Add quit pipe */ | |
4a15001e | 403 | ret = lttng_poll_add(events, a_pipe[0], LPOLLIN | LPOLLERR); |
5eb91c98 DG |
404 | if (ret < 0) { |
405 | goto error; | |
406 | } | |
407 | ||
408 | return 0; | |
409 | ||
410 | error: | |
411 | return ret; | |
412 | } | |
413 | ||
4a15001e MD |
414 | /* |
415 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
416 | */ | |
417 | int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size) | |
418 | { | |
419 | return __sessiond_set_thread_pollset(events, size, thread_quit_pipe); | |
420 | } | |
421 | ||
422 | /* | |
423 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
424 | */ | |
425 | int sessiond_set_ht_cleanup_thread_pollset(struct lttng_poll_event *events, | |
426 | size_t size) | |
427 | { | |
428 | return __sessiond_set_thread_pollset(events, size, | |
429 | ht_cleanup_quit_pipe); | |
430 | } | |
431 | ||
432 | static | |
433 | int __sessiond_check_thread_quit_pipe(int fd, uint32_t events, int a_pipe) | |
434 | { | |
435 | if (fd == a_pipe && (events & LPOLLIN)) { | |
436 | return 1; | |
437 | } | |
438 | return 0; | |
439 | } | |
440 | ||
5eb91c98 DG |
441 | /* |
442 | * Check if the thread quit pipe was triggered. | |
443 | * | |
444 | * Return 1 if it was triggered else 0; | |
445 | */ | |
d0b96690 | 446 | int sessiond_check_thread_quit_pipe(int fd, uint32_t events) |
5eb91c98 | 447 | { |
4a15001e MD |
448 | return __sessiond_check_thread_quit_pipe(fd, events, |
449 | thread_quit_pipe[0]); | |
450 | } | |
5eb91c98 | 451 | |
4a15001e MD |
452 | /* |
453 | * Check if the ht_cleanup thread quit pipe was triggered. | |
454 | * | |
455 | * Return 1 if it was triggered else 0; | |
456 | */ | |
457 | int sessiond_check_ht_cleanup_quit(int fd, uint32_t events) | |
458 | { | |
459 | return __sessiond_check_thread_quit_pipe(fd, events, | |
460 | ht_cleanup_quit_pipe[0]); | |
5eb91c98 DG |
461 | } |
462 | ||
273ea72c | 463 | /* |
5eb91c98 | 464 | * Init thread quit pipe. |
273ea72c DG |
465 | * |
466 | * Return -1 on error or 0 if all pipes are created. | |
467 | */ | |
4a15001e | 468 | static int __init_thread_quit_pipe(int *a_pipe) |
273ea72c | 469 | { |
730389d9 | 470 | int ret, i; |
273ea72c | 471 | |
4a15001e | 472 | ret = pipe(a_pipe); |
273ea72c | 473 | if (ret < 0) { |
730389d9 | 474 | PERROR("thread quit pipe"); |
273ea72c DG |
475 | goto error; |
476 | } | |
477 | ||
730389d9 | 478 | for (i = 0; i < 2; i++) { |
4a15001e | 479 | ret = fcntl(a_pipe[i], F_SETFD, FD_CLOEXEC); |
730389d9 DG |
480 | if (ret < 0) { |
481 | PERROR("fcntl"); | |
482 | goto error; | |
483 | } | |
484 | } | |
485 | ||
273ea72c DG |
486 | error: |
487 | return ret; | |
488 | } | |
489 | ||
4a15001e MD |
490 | static int init_thread_quit_pipe(void) |
491 | { | |
492 | return __init_thread_quit_pipe(thread_quit_pipe); | |
493 | } | |
494 | ||
495 | static int init_ht_cleanup_quit_pipe(void) | |
496 | { | |
497 | return __init_thread_quit_pipe(ht_cleanup_quit_pipe); | |
498 | } | |
499 | ||
099e26bd DG |
500 | /* |
501 | * Stop all threads by closing the thread quit pipe. | |
502 | */ | |
cf3af59e MD |
503 | static void stop_threads(void) |
504 | { | |
5eb91c98 DG |
505 | int ret; |
506 | ||
cf3af59e MD |
507 | /* Stopping all threads */ |
508 | DBG("Terminating all threads"); | |
54d01ffb | 509 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
510 | if (ret < 0) { |
511 | ERR("write error on thread quit pipe"); | |
512 | } | |
513 | ||
099e26bd | 514 | /* Dispatch thread */ |
26c9d55e | 515 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
099e26bd | 516 | futex_nto1_wake(&ust_cmd_queue.futex); |
cf3af59e MD |
517 | } |
518 | ||
e975f9f8 DG |
519 | /* |
520 | * Close every consumer sockets. | |
521 | */ | |
522 | static void close_consumer_sockets(void) | |
523 | { | |
524 | int ret; | |
525 | ||
526 | if (kconsumer_data.err_sock >= 0) { | |
527 | ret = close(kconsumer_data.err_sock); | |
528 | if (ret < 0) { | |
529 | PERROR("kernel consumer err_sock close"); | |
530 | } | |
531 | } | |
532 | if (ustconsumer32_data.err_sock >= 0) { | |
533 | ret = close(ustconsumer32_data.err_sock); | |
534 | if (ret < 0) { | |
a76cbd9f | 535 | PERROR("UST consumerd32 err_sock close"); |
e975f9f8 DG |
536 | } |
537 | } | |
538 | if (ustconsumer64_data.err_sock >= 0) { | |
539 | ret = close(ustconsumer64_data.err_sock); | |
540 | if (ret < 0) { | |
a76cbd9f | 541 | PERROR("UST consumerd64 err_sock close"); |
e975f9f8 DG |
542 | } |
543 | } | |
544 | if (kconsumer_data.cmd_sock >= 0) { | |
545 | ret = close(kconsumer_data.cmd_sock); | |
546 | if (ret < 0) { | |
547 | PERROR("kernel consumer cmd_sock close"); | |
548 | } | |
549 | } | |
550 | if (ustconsumer32_data.cmd_sock >= 0) { | |
551 | ret = close(ustconsumer32_data.cmd_sock); | |
552 | if (ret < 0) { | |
a76cbd9f | 553 | PERROR("UST consumerd32 cmd_sock close"); |
e975f9f8 DG |
554 | } |
555 | } | |
556 | if (ustconsumer64_data.cmd_sock >= 0) { | |
557 | ret = close(ustconsumer64_data.cmd_sock); | |
558 | if (ret < 0) { | |
a76cbd9f | 559 | PERROR("UST consumerd64 cmd_sock close"); |
e975f9f8 DG |
560 | } |
561 | } | |
562 | } | |
563 | ||
c9cb3e7d JG |
564 | /* |
565 | * Generate the full lock file path using the rundir. | |
566 | * | |
567 | * Return the snprintf() return value thus a negative value is an error. | |
568 | */ | |
569 | static int generate_lock_file_path(char *path, size_t len) | |
570 | { | |
571 | int ret; | |
572 | ||
573 | assert(path); | |
574 | assert(rundir); | |
575 | ||
576 | /* Build lockfile path from rundir. */ | |
577 | ret = snprintf(path, len, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE, rundir); | |
578 | if (ret < 0) { | |
579 | PERROR("snprintf lockfile path"); | |
580 | } | |
581 | ||
582 | return ret; | |
583 | } | |
584 | ||
fac6795d | 585 | /* |
4a15001e | 586 | * Cleanup the session daemon's data structures. |
fac6795d | 587 | */ |
4a15001e | 588 | static void sessiond_cleanup(void) |
fac6795d | 589 | { |
ef599319 | 590 | int ret; |
af9737e9 | 591 | struct ltt_session *sess, *stmp; |
8c6c56c2 | 592 | char path[PATH_MAX]; |
fac6795d | 593 | |
4a15001e | 594 | DBG("Cleanup sessiond"); |
e07ae692 | 595 | |
4e449f3f MD |
596 | /* |
597 | * Close the thread quit pipe. It has already done its job, | |
598 | * since we are now called. | |
599 | */ | |
2f77fc4b DG |
600 | utils_close_pipe(thread_quit_pipe); |
601 | ||
35f90c40 DG |
602 | /* |
603 | * If opt_pidfile is undefined, the default file will be wiped when | |
604 | * removing the rundir. | |
605 | */ | |
606 | if (opt_pidfile) { | |
607 | ret = remove(opt_pidfile); | |
608 | if (ret < 0) { | |
609 | PERROR("remove pidfile %s", opt_pidfile); | |
610 | } | |
611 | } | |
612 | ||
8c6c56c2 MD |
613 | DBG("Removing sessiond and consumerd content of directory %s", rundir); |
614 | ||
615 | /* sessiond */ | |
616 | snprintf(path, PATH_MAX, | |
617 | "%s/%s", | |
618 | rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE); | |
619 | DBG("Removing %s", path); | |
620 | (void) unlink(path); | |
621 | ||
cd9290dd | 622 | snprintf(path, PATH_MAX, "%s/%s", rundir, |
022d91ba | 623 | DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE); |
cd9290dd DG |
624 | DBG("Removing %s", path); |
625 | (void) unlink(path); | |
626 | ||
8c6c56c2 MD |
627 | /* kconsumerd */ |
628 | snprintf(path, PATH_MAX, | |
629 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, | |
630 | rundir); | |
631 | DBG("Removing %s", path); | |
632 | (void) unlink(path); | |
633 | ||
634 | snprintf(path, PATH_MAX, | |
635 | DEFAULT_KCONSUMERD_PATH, | |
636 | rundir); | |
637 | DBG("Removing directory %s", path); | |
638 | (void) rmdir(path); | |
639 | ||
640 | /* ust consumerd 32 */ | |
641 | snprintf(path, PATH_MAX, | |
642 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, | |
643 | rundir); | |
644 | DBG("Removing %s", path); | |
645 | (void) unlink(path); | |
646 | ||
647 | snprintf(path, PATH_MAX, | |
648 | DEFAULT_USTCONSUMERD32_PATH, | |
649 | rundir); | |
650 | DBG("Removing directory %s", path); | |
651 | (void) rmdir(path); | |
652 | ||
653 | /* ust consumerd 64 */ | |
654 | snprintf(path, PATH_MAX, | |
655 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, | |
656 | rundir); | |
657 | DBG("Removing %s", path); | |
658 | (void) unlink(path); | |
659 | ||
660 | snprintf(path, PATH_MAX, | |
661 | DEFAULT_USTCONSUMERD64_PATH, | |
662 | rundir); | |
663 | DBG("Removing directory %s", path); | |
664 | (void) rmdir(path); | |
5461b305 | 665 | |
99bab54f | 666 | DBG("Cleaning up all sessions"); |
fac6795d | 667 | |
b5541356 | 668 | /* Destroy session list mutex */ |
273ea72c DG |
669 | if (session_list_ptr != NULL) { |
670 | pthread_mutex_destroy(&session_list_ptr->lock); | |
671 | ||
672 | /* Cleanup ALL session */ | |
54d01ffb DG |
673 | cds_list_for_each_entry_safe(sess, stmp, |
674 | &session_list_ptr->head, list) { | |
2f77fc4b | 675 | cmd_destroy_session(sess, kernel_poll_pipe[1]); |
273ea72c DG |
676 | } |
677 | } | |
678 | ||
099e26bd | 679 | DBG("Closing all UST sockets"); |
56fff090 | 680 | ust_app_clean_list(); |
7972aab2 | 681 | buffer_reg_destroy_registries(); |
099e26bd | 682 | |
4fba7219 DG |
683 | if (is_root && !opt_no_kernel) { |
684 | DBG2("Closing kernel fd"); | |
a4b35e07 | 685 | if (kernel_tracer_fd >= 0) { |
76d7553f MD |
686 | ret = close(kernel_tracer_fd); |
687 | if (ret) { | |
688 | PERROR("close"); | |
689 | } | |
a4b35e07 | 690 | } |
2f50c8a3 | 691 | DBG("Unloading kernel modules"); |
096102bd | 692 | modprobe_remove_lttng_all(); |
834978fd | 693 | free(syscall_table); |
2f50c8a3 | 694 | } |
2f77fc4b | 695 | |
e975f9f8 DG |
696 | close_consumer_sockets(); |
697 | ||
ef367a93 JG |
698 | if (load_info) { |
699 | load_session_destroy_data(load_info); | |
700 | free(load_info); | |
701 | } | |
702 | ||
c9cb3e7d JG |
703 | /* |
704 | * Cleanup lock file by deleting it and finaly closing it which will | |
705 | * release the file system lock. | |
706 | */ | |
707 | if (lockfile_fd >= 0) { | |
708 | char lockfile_path[PATH_MAX]; | |
709 | ||
4a15001e MD |
710 | ret = generate_lock_file_path(lockfile_path, |
711 | sizeof(lockfile_path)); | |
c9cb3e7d JG |
712 | if (ret > 0) { |
713 | ret = remove(lockfile_path); | |
714 | if (ret < 0) { | |
715 | PERROR("remove lock file"); | |
716 | } | |
717 | ret = close(lockfile_fd); | |
718 | if (ret < 0) { | |
719 | PERROR("close lock file"); | |
720 | } | |
721 | } | |
722 | } | |
723 | ||
724 | /* | |
725 | * We do NOT rmdir rundir because there are other processes | |
726 | * using it, for instance lttng-relayd, which can start in | |
727 | * parallel with this teardown. | |
728 | */ | |
729 | ||
730 | free(rundir); | |
4a15001e MD |
731 | } |
732 | ||
733 | /* | |
734 | * Cleanup the daemon's option data structures. | |
735 | */ | |
736 | static void sessiond_cleanup_options(void) | |
737 | { | |
738 | DBG("Cleaning up options"); | |
739 | ||
740 | /* | |
741 | * If the override option is set, the pointer points to a *non* const | |
742 | * thus freeing it even though the variable type is set to const. | |
743 | */ | |
744 | if (tracing_group_name_override) { | |
745 | free((void *) tracing_group_name); | |
746 | } | |
747 | if (consumerd32_bin_override) { | |
748 | free((void *) consumerd32_bin); | |
749 | } | |
750 | if (consumerd64_bin_override) { | |
751 | free((void *) consumerd64_bin); | |
752 | } | |
753 | if (consumerd32_libdir_override) { | |
754 | free((void *) consumerd32_libdir); | |
755 | } | |
756 | if (consumerd64_libdir_override) { | |
757 | free((void *) consumerd64_libdir); | |
758 | } | |
759 | ||
760 | free(opt_pidfile); | |
761 | free(opt_load_session_path); | |
762 | free(kmod_probes_list); | |
763 | free(kmod_extra_probes_list); | |
c9cb3e7d | 764 | |
421cb601 | 765 | /* <fun> */ |
f56a39af | 766 | DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
421cb601 DG |
767 | "Matthew, BEET driven development works!%c[%dm", |
768 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
769 | /* </fun> */ | |
fac6795d DG |
770 | } |
771 | ||
e065084a | 772 | /* |
d063d709 | 773 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 774 | * |
d063d709 | 775 | * Return lttcomm error code. |
e065084a DG |
776 | */ |
777 | static int send_unix_sock(int sock, void *buf, size_t len) | |
778 | { | |
779 | /* Check valid length */ | |
c617c0c6 | 780 | if (len == 0) { |
e065084a DG |
781 | return -1; |
782 | } | |
783 | ||
784 | return lttcomm_send_unix_sock(sock, buf, len); | |
785 | } | |
786 | ||
5461b305 | 787 | /* |
d063d709 | 788 | * Free memory of a command context structure. |
5461b305 | 789 | */ |
a2fb29a5 | 790 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 791 | { |
a2fb29a5 DG |
792 | DBG("Clean command context structure"); |
793 | if (*cmd_ctx) { | |
794 | if ((*cmd_ctx)->llm) { | |
795 | free((*cmd_ctx)->llm); | |
5461b305 | 796 | } |
a2fb29a5 DG |
797 | if ((*cmd_ctx)->lsm) { |
798 | free((*cmd_ctx)->lsm); | |
5461b305 | 799 | } |
a2fb29a5 DG |
800 | free(*cmd_ctx); |
801 | *cmd_ctx = NULL; | |
5461b305 DG |
802 | } |
803 | } | |
804 | ||
fac6795d | 805 | /* |
0fdd1e2c | 806 | * Notify UST applications using the shm mmap futex. |
fac6795d | 807 | */ |
0fdd1e2c | 808 | static int notify_ust_apps(int active) |
fac6795d | 809 | { |
0fdd1e2c | 810 | char *wait_shm_mmap; |
fac6795d | 811 | |
0fdd1e2c | 812 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 813 | |
0fdd1e2c DG |
814 | /* See shm.c for this call implying mmap, shm and futex calls */ |
815 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
816 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
817 | goto error; |
818 | } | |
819 | ||
0fdd1e2c DG |
820 | /* Wake waiting process */ |
821 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
822 | ||
823 | /* Apps notified successfully */ | |
824 | return 0; | |
fac6795d DG |
825 | |
826 | error: | |
0fdd1e2c | 827 | return -1; |
fac6795d DG |
828 | } |
829 | ||
e065084a | 830 | /* |
d063d709 DG |
831 | * Setup the outgoing data buffer for the response (llm) by allocating the |
832 | * right amount of memory and copying the original information from the lsm | |
833 | * structure. | |
ca95a216 | 834 | * |
d063d709 | 835 | * Return total size of the buffer pointed by buf. |
ca95a216 | 836 | */ |
5461b305 | 837 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 838 | { |
f3ed775e | 839 | int ret, buf_size; |
ca95a216 | 840 | |
f3ed775e | 841 | buf_size = size; |
5461b305 | 842 | |
ba7f0ae5 | 843 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 844 | if (cmd_ctx->llm == NULL) { |
76d7553f | 845 | PERROR("zmalloc"); |
5461b305 | 846 | ret = -ENOMEM; |
ca95a216 DG |
847 | goto error; |
848 | } | |
849 | ||
5461b305 DG |
850 | /* Copy common data */ |
851 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 852 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 853 | |
5461b305 DG |
854 | cmd_ctx->llm->data_size = size; |
855 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
856 | ||
ca95a216 DG |
857 | return buf_size; |
858 | ||
859 | error: | |
860 | return ret; | |
861 | } | |
862 | ||
7a485870 | 863 | /* |
5eb91c98 | 864 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 865 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 866 | */ |
5eb91c98 | 867 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 868 | { |
5eb91c98 | 869 | int ret; |
7a485870 DG |
870 | struct ltt_session *session; |
871 | struct ltt_kernel_channel *channel; | |
872 | ||
5eb91c98 | 873 | DBG("Updating kernel poll set"); |
7a485870 | 874 | |
54d01ffb | 875 | session_lock_list(); |
b5541356 | 876 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 877 | session_lock(session); |
7a485870 | 878 | if (session->kernel_session == NULL) { |
54d01ffb | 879 | session_unlock(session); |
7a485870 DG |
880 | continue; |
881 | } | |
7a485870 | 882 | |
54d01ffb DG |
883 | cds_list_for_each_entry(channel, |
884 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
885 | /* Add channel fd to the kernel poll set */ |
886 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
887 | if (ret < 0) { | |
54d01ffb | 888 | session_unlock(session); |
5eb91c98 DG |
889 | goto error; |
890 | } | |
891 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 892 | } |
54d01ffb | 893 | session_unlock(session); |
7a485870 | 894 | } |
54d01ffb | 895 | session_unlock_list(); |
7a485870 | 896 | |
5eb91c98 | 897 | return 0; |
7a485870 DG |
898 | |
899 | error: | |
54d01ffb | 900 | session_unlock_list(); |
7a485870 DG |
901 | return -1; |
902 | } | |
903 | ||
904 | /* | |
54d01ffb | 905 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 906 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 907 | * |
d063d709 | 908 | * Useful for CPU hotplug feature. |
7a485870 | 909 | */ |
2bdd86d4 | 910 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
911 | { |
912 | int ret = 0; | |
913 | struct ltt_session *session; | |
173af62f | 914 | struct ltt_kernel_session *ksess; |
7a485870 DG |
915 | struct ltt_kernel_channel *channel; |
916 | ||
917 | DBG("Updating kernel streams for channel fd %d", fd); | |
918 | ||
54d01ffb | 919 | session_lock_list(); |
b5541356 | 920 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 921 | session_lock(session); |
7a485870 | 922 | if (session->kernel_session == NULL) { |
54d01ffb | 923 | session_unlock(session); |
7a485870 DG |
924 | continue; |
925 | } | |
173af62f | 926 | ksess = session->kernel_session; |
d9800920 | 927 | |
4a15001e MD |
928 | cds_list_for_each_entry(channel, |
929 | &ksess->channel_list.head, list) { | |
930 | struct lttng_ht_iter iter; | |
931 | struct consumer_socket *socket; | |
d9800920 | 932 | |
4a15001e MD |
933 | if (channel->fd != fd) { |
934 | continue; | |
935 | } | |
936 | DBG("Channel found, updating kernel streams"); | |
937 | ret = kernel_open_channel_stream(channel); | |
938 | if (ret < 0) { | |
939 | goto error; | |
940 | } | |
941 | /* Update the stream global counter */ | |
942 | ksess->stream_count_global += ret; | |
943 | ||
944 | /* | |
945 | * Have we already sent fds to the consumer? If yes, it | |
946 | * means that tracing is started so it is safe to send | |
947 | * our updated stream fds. | |
948 | */ | |
949 | if (ksess->consumer_fds_sent != 1 | |
950 | || ksess->consumer == NULL) { | |
951 | ret = -1; | |
952 | goto error; | |
953 | } | |
954 | ||
955 | rcu_read_lock(); | |
956 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, | |
957 | &iter.iter, socket, node.node) { | |
958 | pthread_mutex_lock(socket->lock); | |
959 | ret = kernel_consumer_send_channel_stream(socket, | |
960 | channel, ksess, | |
961 | session->output_traces ? 1 : 0); | |
962 | pthread_mutex_unlock(socket->lock); | |
963 | if (ret < 0) { | |
e7fe706f | 964 | rcu_read_unlock(); |
4a15001e | 965 | goto error; |
7a485870 | 966 | } |
7a485870 | 967 | } |
4a15001e | 968 | rcu_read_unlock(); |
7a485870 | 969 | } |
54d01ffb | 970 | session_unlock(session); |
7a485870 | 971 | } |
54d01ffb | 972 | session_unlock_list(); |
b3c750d2 | 973 | return ret; |
7a485870 | 974 | |
b3c750d2 | 975 | error: |
54d01ffb DG |
976 | session_unlock(session); |
977 | session_unlock_list(); | |
7a485870 DG |
978 | return ret; |
979 | } | |
980 | ||
487cf67c | 981 | /* |
ffe60014 DG |
982 | * For each tracing session, update newly registered apps. The session list |
983 | * lock MUST be acquired before calling this. | |
487cf67c DG |
984 | */ |
985 | static void update_ust_app(int app_sock) | |
986 | { | |
987 | struct ltt_session *sess, *stmp; | |
988 | ||
fdadac08 DG |
989 | /* Consumer is in an ERROR state. Stop any application update. */ |
990 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
991 | /* Stop the update process since the consumer is dead. */ | |
992 | return; | |
993 | } | |
994 | ||
487cf67c DG |
995 | /* For all tracing session(s) */ |
996 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
a9ad0c8f MD |
997 | struct ust_app *app; |
998 | ||
4ee14516 | 999 | session_lock(sess); |
a9ad0c8f MD |
1000 | if (!sess->ust_session) { |
1001 | goto unlock_session; | |
1002 | } | |
1003 | ||
1004 | rcu_read_lock(); | |
1005 | assert(app_sock >= 0); | |
1006 | app = ust_app_find_by_sock(app_sock); | |
1007 | if (app == NULL) { | |
1008 | /* | |
1009 | * Application can be unregistered before so | |
1010 | * this is possible hence simply stopping the | |
1011 | * update. | |
1012 | */ | |
1013 | DBG3("UST app update failed to find app sock %d", | |
1014 | app_sock); | |
1015 | goto unlock_rcu; | |
421cb601 | 1016 | } |
a9ad0c8f MD |
1017 | ust_app_global_update(sess->ust_session, app); |
1018 | unlock_rcu: | |
1019 | rcu_read_unlock(); | |
1020 | unlock_session: | |
4ee14516 | 1021 | session_unlock(sess); |
487cf67c DG |
1022 | } |
1023 | } | |
1024 | ||
7a485870 | 1025 | /* |
d063d709 | 1026 | * This thread manage event coming from the kernel. |
7a485870 | 1027 | * |
d063d709 DG |
1028 | * Features supported in this thread: |
1029 | * -) CPU Hotplug | |
7a485870 DG |
1030 | */ |
1031 | static void *thread_manage_kernel(void *data) | |
1032 | { | |
139ac872 | 1033 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
5eb91c98 | 1034 | uint32_t revents, nb_fd; |
7a485870 | 1035 | char tmp; |
5eb91c98 | 1036 | struct lttng_poll_event events; |
7a485870 | 1037 | |
6993eeb3 | 1038 | DBG("[thread] Thread manage kernel started"); |
7a485870 | 1039 | |
6c71277b | 1040 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
927ca06a | 1041 | |
d5d63bf1 DG |
1042 | /* |
1043 | * This first step of the while is to clean this structure which could free | |
6d737ce4 | 1044 | * non NULL pointers so initialize it before the loop. |
d5d63bf1 | 1045 | */ |
6d737ce4 | 1046 | lttng_poll_init(&events); |
d5d63bf1 | 1047 | |
e547b070 | 1048 | if (testpoint(sessiond_thread_manage_kernel)) { |
6993eeb3 CB |
1049 | goto error_testpoint; |
1050 | } | |
8ac94142 | 1051 | |
840cb59c | 1052 | health_code_update(); |
44a5e5eb | 1053 | |
e547b070 | 1054 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
d21b0d71 | 1055 | goto error_testpoint; |
6993eeb3 CB |
1056 | } |
1057 | ||
7a485870 | 1058 | while (1) { |
840cb59c | 1059 | health_code_update(); |
44a5e5eb | 1060 | |
7a485870 | 1061 | if (update_poll_flag == 1) { |
d21b0d71 DG |
1062 | /* Clean events object. We are about to populate it again. */ |
1063 | lttng_poll_clean(&events); | |
1064 | ||
d0b96690 | 1065 | ret = sessiond_set_thread_pollset(&events, 2); |
d21b0d71 DG |
1066 | if (ret < 0) { |
1067 | goto error_poll_create; | |
1068 | } | |
1069 | ||
1070 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
1071 | if (ret < 0) { | |
1072 | goto error; | |
1073 | } | |
5f822d0a | 1074 | |
d21b0d71 | 1075 | /* This will add the available kernel channel if any. */ |
5eb91c98 DG |
1076 | ret = update_kernel_poll(&events); |
1077 | if (ret < 0) { | |
7a485870 DG |
1078 | goto error; |
1079 | } | |
1080 | update_poll_flag = 0; | |
1081 | } | |
1082 | ||
7fa2082e | 1083 | DBG("Thread kernel polling"); |
7a485870 DG |
1084 | |
1085 | /* Poll infinite value of time */ | |
88f2b785 | 1086 | restart: |
a78af745 | 1087 | health_poll_entry(); |
5eb91c98 | 1088 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1089 | DBG("Thread kernel return from poll on %d fds", |
1090 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1091 | health_poll_exit(); |
7a485870 | 1092 | if (ret < 0) { |
88f2b785 MD |
1093 | /* |
1094 | * Restart interrupted system call. | |
1095 | */ | |
1096 | if (errno == EINTR) { | |
1097 | goto restart; | |
1098 | } | |
7a485870 DG |
1099 | goto error; |
1100 | } else if (ret == 0) { | |
1101 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
1102 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
1103 | "This should not have happened! Continuing..."); | |
7a485870 DG |
1104 | continue; |
1105 | } | |
1106 | ||
0d9c5d77 DG |
1107 | nb_fd = ret; |
1108 | ||
5eb91c98 DG |
1109 | for (i = 0; i < nb_fd; i++) { |
1110 | /* Fetch once the poll data */ | |
1111 | revents = LTTNG_POLL_GETEV(&events, i); | |
1112 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 1113 | |
840cb59c | 1114 | health_code_update(); |
44a5e5eb | 1115 | |
fd20dac9 MD |
1116 | if (!revents) { |
1117 | /* No activity for this FD (poll implementation). */ | |
1118 | continue; | |
1119 | } | |
1120 | ||
5eb91c98 | 1121 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1122 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1123 | if (ret) { |
139ac872 MD |
1124 | err = 0; |
1125 | goto exit; | |
5eb91c98 | 1126 | } |
7a485870 | 1127 | |
5eb91c98 DG |
1128 | /* Check for data on kernel pipe */ |
1129 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
6cd525e8 MD |
1130 | (void) lttng_read(kernel_poll_pipe[0], |
1131 | &tmp, 1); | |
f921c78f DG |
1132 | /* |
1133 | * Ret value is useless here, if this pipe gets any actions an | |
1134 | * update is required anyway. | |
1135 | */ | |
5eb91c98 DG |
1136 | update_poll_flag = 1; |
1137 | continue; | |
1138 | } else { | |
1139 | /* | |
1140 | * New CPU detected by the kernel. Adding kernel stream to | |
1141 | * kernel session and updating the kernel consumer | |
1142 | */ | |
1143 | if (revents & LPOLLIN) { | |
2bdd86d4 | 1144 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
1145 | if (ret < 0) { |
1146 | continue; | |
1147 | } | |
1148 | break; | |
1149 | /* | |
1150 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
1151 | * and unregister kernel stream at this point. | |
1152 | */ | |
7a485870 | 1153 | } |
7a485870 DG |
1154 | } |
1155 | } | |
1156 | } | |
1157 | ||
139ac872 | 1158 | exit: |
7a485870 | 1159 | error: |
5eb91c98 | 1160 | lttng_poll_clean(&events); |
76d7553f | 1161 | error_poll_create: |
6993eeb3 | 1162 | error_testpoint: |
6620da75 DG |
1163 | utils_close_pipe(kernel_poll_pipe); |
1164 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; | |
139ac872 | 1165 | if (err) { |
840cb59c | 1166 | health_error(); |
139ac872 | 1167 | ERR("Health error occurred in %s", __func__); |
6620da75 DG |
1168 | WARN("Kernel thread died unexpectedly. " |
1169 | "Kernel tracing can continue but CPU hotplug is disabled."); | |
139ac872 | 1170 | } |
8782cc74 | 1171 | health_unregister(health_sessiond); |
76d7553f | 1172 | DBG("Kernel thread dying"); |
7a485870 DG |
1173 | return NULL; |
1174 | } | |
1175 | ||
a23ec3a7 DG |
1176 | /* |
1177 | * Signal pthread condition of the consumer data that the thread. | |
1178 | */ | |
1179 | static void signal_consumer_condition(struct consumer_data *data, int state) | |
1180 | { | |
1181 | pthread_mutex_lock(&data->cond_mutex); | |
1182 | ||
1183 | /* | |
1184 | * The state is set before signaling. It can be any value, it's the waiter | |
1185 | * job to correctly interpret this condition variable associated to the | |
1186 | * consumer pthread_cond. | |
1187 | * | |
1188 | * A value of 0 means that the corresponding thread of the consumer data | |
1189 | * was not started. 1 indicates that the thread has started and is ready | |
1190 | * for action. A negative value means that there was an error during the | |
1191 | * thread bootstrap. | |
1192 | */ | |
1193 | data->consumer_thread_is_ready = state; | |
1194 | (void) pthread_cond_signal(&data->cond); | |
1195 | ||
1196 | pthread_mutex_unlock(&data->cond_mutex); | |
1197 | } | |
1198 | ||
1d4b027a | 1199 | /* |
3bd1e081 | 1200 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 1201 | */ |
3bd1e081 | 1202 | static void *thread_manage_consumer(void *data) |
1d4b027a | 1203 | { |
42fc1d0b | 1204 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
5eb91c98 | 1205 | uint32_t revents, nb_fd; |
1d4b027a | 1206 | enum lttcomm_return_code code; |
5eb91c98 | 1207 | struct lttng_poll_event events; |
3bd1e081 | 1208 | struct consumer_data *consumer_data = data; |
1d4b027a | 1209 | |
3bd1e081 | 1210 | DBG("[thread] Manage consumer started"); |
1d4b027a | 1211 | |
6c71277b | 1212 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
927ca06a | 1213 | |
855060f8 | 1214 | health_code_update(); |
9449cc75 | 1215 | |
5eb91c98 | 1216 | /* |
331744e3 JD |
1217 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
1218 | * metadata_sock. Nothing more will be added to this poll set. | |
5eb91c98 | 1219 | */ |
331744e3 | 1220 | ret = sessiond_set_thread_pollset(&events, 3); |
5eb91c98 | 1221 | if (ret < 0) { |
76d7553f | 1222 | goto error_poll; |
5eb91c98 | 1223 | } |
273ea72c | 1224 | |
edb8b045 DG |
1225 | /* |
1226 | * The error socket here is already in a listening state which was done | |
1227 | * just before spawning this thread to avoid a race between the consumer | |
1228 | * daemon exec trying to connect and the listen() call. | |
1229 | */ | |
3bd1e081 | 1230 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
1231 | if (ret < 0) { |
1232 | goto error; | |
1233 | } | |
1234 | ||
840cb59c | 1235 | health_code_update(); |
44a5e5eb | 1236 | |
331744e3 | 1237 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1238 | restart: |
a78af745 | 1239 | health_poll_entry(); |
8ac94142 | 1240 | |
e547b070 | 1241 | if (testpoint(sessiond_thread_manage_consumer)) { |
6993eeb3 CB |
1242 | goto error; |
1243 | } | |
8ac94142 | 1244 | |
5eb91c98 | 1245 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 1246 | health_poll_exit(); |
273ea72c | 1247 | if (ret < 0) { |
88f2b785 MD |
1248 | /* |
1249 | * Restart interrupted system call. | |
1250 | */ | |
1251 | if (errno == EINTR) { | |
1252 | goto restart; | |
1253 | } | |
273ea72c DG |
1254 | goto error; |
1255 | } | |
1256 | ||
0d9c5d77 DG |
1257 | nb_fd = ret; |
1258 | ||
5eb91c98 DG |
1259 | for (i = 0; i < nb_fd; i++) { |
1260 | /* Fetch once the poll data */ | |
1261 | revents = LTTNG_POLL_GETEV(&events, i); | |
1262 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1263 | ||
840cb59c | 1264 | health_code_update(); |
44a5e5eb | 1265 | |
fd20dac9 MD |
1266 | if (!revents) { |
1267 | /* No activity for this FD (poll implementation). */ | |
1268 | continue; | |
1269 | } | |
1270 | ||
5eb91c98 | 1271 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1272 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1273 | if (ret) { |
139ac872 MD |
1274 | err = 0; |
1275 | goto exit; | |
5eb91c98 DG |
1276 | } |
1277 | ||
1278 | /* Event on the registration socket */ | |
3bd1e081 | 1279 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 1280 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 1281 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
1282 | goto error; |
1283 | } | |
1284 | } | |
273ea72c DG |
1285 | } |
1286 | ||
3bd1e081 | 1287 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
1288 | if (sock < 0) { |
1289 | goto error; | |
1290 | } | |
1291 | ||
b662582b DG |
1292 | /* |
1293 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
1294 | * show must go on. | |
1295 | */ | |
1296 | (void) utils_set_fd_cloexec(sock); | |
1297 | ||
840cb59c | 1298 | health_code_update(); |
44a5e5eb | 1299 | |
3bd1e081 | 1300 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 1301 | |
712ea556 | 1302 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
1303 | ret = lttcomm_recv_unix_sock(sock, &code, |
1304 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
1305 | if (ret <= 0) { |
1306 | goto error; | |
1307 | } | |
1308 | ||
840cb59c | 1309 | health_code_update(); |
f73fabfd | 1310 | if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
331744e3 | 1311 | /* Connect both socket, command and metadata. */ |
3bd1e081 MD |
1312 | consumer_data->cmd_sock = |
1313 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
4ce514c4 | 1314 | consumer_data->metadata_fd = |
331744e3 | 1315 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); |
92db7cdc DG |
1316 | if (consumer_data->cmd_sock < 0 |
1317 | || consumer_data->metadata_fd < 0) { | |
331744e3 | 1318 | PERROR("consumer connect cmd socket"); |
a23ec3a7 DG |
1319 | /* On error, signal condition and quit. */ |
1320 | signal_consumer_condition(consumer_data, -1); | |
1d4b027a DG |
1321 | goto error; |
1322 | } | |
9363801e | 1323 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; |
331744e3 JD |
1324 | /* Create metadata socket lock. */ |
1325 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
1326 | if (consumer_data->metadata_sock.lock == NULL) { | |
1327 | PERROR("zmalloc pthread mutex"); | |
1328 | ret = -1; | |
1329 | goto error; | |
1330 | } | |
1331 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
1332 | ||
a23ec3a7 | 1333 | signal_consumer_condition(consumer_data, 1); |
331744e3 JD |
1334 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
1335 | DBG("Consumer metadata socket ready (fd: %d)", | |
4ce514c4 | 1336 | consumer_data->metadata_fd); |
1d4b027a | 1337 | } else { |
3bd1e081 | 1338 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1339 | lttcomm_get_readable_code(-code)); |
1340 | goto error; | |
1341 | } | |
1342 | ||
331744e3 | 1343 | /* Remove the consumerd error sock since we've established a connexion */ |
3bd1e081 | 1344 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1345 | if (ret < 0) { |
72079cae DG |
1346 | goto error; |
1347 | } | |
1348 | ||
331744e3 | 1349 | /* Add new accepted error socket. */ |
5eb91c98 DG |
1350 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1351 | if (ret < 0) { | |
72079cae | 1352 | goto error; |
5eb91c98 DG |
1353 | } |
1354 | ||
331744e3 | 1355 | /* Add metadata socket that is successfully connected. */ |
4ce514c4 | 1356 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
331744e3 JD |
1357 | LPOLLIN | LPOLLRDHUP); |
1358 | if (ret < 0) { | |
1359 | goto error; | |
1360 | } | |
1361 | ||
840cb59c | 1362 | health_code_update(); |
44a5e5eb | 1363 | |
331744e3 | 1364 | /* Infinite blocking call, waiting for transmission */ |
88f2b785 | 1365 | restart_poll: |
331744e3 | 1366 | while (1) { |
42fc1d0b DG |
1367 | health_code_update(); |
1368 | ||
1369 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
1370 | if (should_quit) { | |
1371 | /* Not a health error. */ | |
1372 | err = 0; | |
1373 | goto exit; | |
1374 | } | |
1375 | ||
331744e3 JD |
1376 | health_poll_entry(); |
1377 | ret = lttng_poll_wait(&events, -1); | |
1378 | health_poll_exit(); | |
1379 | if (ret < 0) { | |
1380 | /* | |
1381 | * Restart interrupted system call. | |
1382 | */ | |
1383 | if (errno == EINTR) { | |
1384 | goto restart_poll; | |
1385 | } | |
1386 | goto error; | |
88f2b785 | 1387 | } |
72079cae | 1388 | |
331744e3 | 1389 | nb_fd = ret; |
0d9c5d77 | 1390 | |
331744e3 JD |
1391 | for (i = 0; i < nb_fd; i++) { |
1392 | /* Fetch once the poll data */ | |
1393 | revents = LTTNG_POLL_GETEV(&events, i); | |
1394 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
5eb91c98 | 1395 | |
331744e3 | 1396 | health_code_update(); |
44a5e5eb | 1397 | |
fd20dac9 MD |
1398 | if (!revents) { |
1399 | /* No activity for this FD (poll implementation). */ | |
1400 | continue; | |
1401 | } | |
1402 | ||
42fc1d0b DG |
1403 | /* |
1404 | * Thread quit pipe has been triggered, flag that we should stop | |
1405 | * but continue the current loop to handle potential data from | |
1406 | * consumer. | |
1407 | */ | |
1408 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); | |
5eb91c98 | 1409 | |
331744e3 JD |
1410 | if (pollfd == sock) { |
1411 | /* Event on the consumerd socket */ | |
1412 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1413 | ERR("consumer err socket second poll error"); | |
1414 | goto error; | |
1415 | } | |
1416 | health_code_update(); | |
1417 | /* Wait for any kconsumerd error */ | |
1418 | ret = lttcomm_recv_unix_sock(sock, &code, | |
1419 | sizeof(enum lttcomm_return_code)); | |
1420 | if (ret <= 0) { | |
1421 | ERR("consumer closed the command socket"); | |
1422 | goto error; | |
1423 | } | |
1424 | ||
1425 | ERR("consumer return code : %s", | |
1426 | lttcomm_get_readable_code(-code)); | |
1427 | ||
1428 | goto exit; | |
4ce514c4 | 1429 | } else if (pollfd == consumer_data->metadata_fd) { |
331744e3 JD |
1430 | /* UST metadata requests */ |
1431 | ret = ust_consumer_metadata_request( | |
1432 | &consumer_data->metadata_sock); | |
1433 | if (ret < 0) { | |
1434 | ERR("Handling metadata request"); | |
1435 | goto error; | |
1436 | } | |
5eb91c98 | 1437 | } |
42fc1d0b | 1438 | /* No need for an else branch all FDs are tested prior. */ |
5eb91c98 | 1439 | } |
331744e3 | 1440 | health_code_update(); |
5eb91c98 DG |
1441 | } |
1442 | ||
139ac872 | 1443 | exit: |
1d4b027a | 1444 | error: |
fdadac08 DG |
1445 | /* |
1446 | * We lock here because we are about to close the sockets and some other | |
92db7cdc DG |
1447 | * thread might be using them so get exclusive access which will abort all |
1448 | * other consumer command by other threads. | |
fdadac08 DG |
1449 | */ |
1450 | pthread_mutex_lock(&consumer_data->lock); | |
1451 | ||
5c827ce0 DG |
1452 | /* Immediately set the consumerd state to stopped */ |
1453 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
1454 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
1455 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
1456 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
1457 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
1458 | } else { | |
1459 | /* Code flow error... */ | |
1460 | assert(0); | |
1461 | } | |
1462 | ||
76d7553f MD |
1463 | if (consumer_data->err_sock >= 0) { |
1464 | ret = close(consumer_data->err_sock); | |
1465 | if (ret) { | |
1466 | PERROR("close"); | |
1467 | } | |
a76cbd9f | 1468 | consumer_data->err_sock = -1; |
76d7553f MD |
1469 | } |
1470 | if (consumer_data->cmd_sock >= 0) { | |
1471 | ret = close(consumer_data->cmd_sock); | |
1472 | if (ret) { | |
1473 | PERROR("close"); | |
1474 | } | |
a76cbd9f | 1475 | consumer_data->cmd_sock = -1; |
76d7553f | 1476 | } |
96544455 SS |
1477 | if (consumer_data->metadata_sock.fd_ptr && |
1478 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
9363801e | 1479 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
331744e3 JD |
1480 | if (ret) { |
1481 | PERROR("close"); | |
1482 | } | |
1483 | } | |
76d7553f MD |
1484 | if (sock >= 0) { |
1485 | ret = close(sock); | |
1486 | if (ret) { | |
1487 | PERROR("close"); | |
1488 | } | |
1489 | } | |
273ea72c | 1490 | |
3bd1e081 MD |
1491 | unlink(consumer_data->err_unix_sock_path); |
1492 | unlink(consumer_data->cmd_unix_sock_path); | |
1493 | consumer_data->pid = 0; | |
fdadac08 | 1494 | pthread_mutex_unlock(&consumer_data->lock); |
92db7cdc | 1495 | |
fdadac08 | 1496 | /* Cleanup metadata socket mutex. */ |
96544455 SS |
1497 | if (consumer_data->metadata_sock.lock) { |
1498 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
1499 | free(consumer_data->metadata_sock.lock); | |
1500 | } | |
5eb91c98 | 1501 | lttng_poll_clean(&events); |
76d7553f | 1502 | error_poll: |
139ac872 | 1503 | if (err) { |
840cb59c | 1504 | health_error(); |
139ac872 MD |
1505 | ERR("Health error occurred in %s", __func__); |
1506 | } | |
8782cc74 | 1507 | health_unregister(health_sessiond); |
76d7553f | 1508 | DBG("consumer thread cleanup completed"); |
0177d773 | 1509 | |
5eb91c98 | 1510 | return NULL; |
099e26bd DG |
1511 | } |
1512 | ||
099e26bd DG |
1513 | /* |
1514 | * This thread manage application communication. | |
1d4b027a DG |
1515 | */ |
1516 | static void *thread_manage_apps(void *data) | |
099e26bd | 1517 | { |
139ac872 | 1518 | int i, ret, pollfd, err = -1; |
6cd525e8 | 1519 | ssize_t size_ret; |
5eb91c98 | 1520 | uint32_t revents, nb_fd; |
5eb91c98 | 1521 | struct lttng_poll_event events; |
099e26bd DG |
1522 | |
1523 | DBG("[thread] Manage application started"); | |
1524 | ||
f6a9efaa DG |
1525 | rcu_register_thread(); |
1526 | rcu_thread_online(); | |
1527 | ||
6c71277b | 1528 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
927ca06a | 1529 | |
e547b070 | 1530 | if (testpoint(sessiond_thread_manage_apps)) { |
6993eeb3 CB |
1531 | goto error_testpoint; |
1532 | } | |
1533 | ||
840cb59c | 1534 | health_code_update(); |
44a5e5eb | 1535 | |
d0b96690 | 1536 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 1537 | if (ret < 0) { |
76d7553f | 1538 | goto error_poll_create; |
5eb91c98 | 1539 | } |
099e26bd | 1540 | |
5eb91c98 DG |
1541 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1542 | if (ret < 0) { | |
1543 | goto error; | |
1544 | } | |
099e26bd | 1545 | |
e547b070 | 1546 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
6993eeb3 CB |
1547 | goto error; |
1548 | } | |
8ac94142 | 1549 | |
840cb59c | 1550 | health_code_update(); |
44a5e5eb | 1551 | |
5eb91c98 | 1552 | while (1) { |
7fa2082e | 1553 | DBG("Apps thread polling"); |
099e26bd DG |
1554 | |
1555 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 1556 | restart: |
a78af745 | 1557 | health_poll_entry(); |
5eb91c98 | 1558 | ret = lttng_poll_wait(&events, -1); |
7fa2082e MD |
1559 | DBG("Apps thread return from poll on %d fds", |
1560 | LTTNG_POLL_GETNB(&events)); | |
a78af745 | 1561 | health_poll_exit(); |
099e26bd | 1562 | if (ret < 0) { |
88f2b785 MD |
1563 | /* |
1564 | * Restart interrupted system call. | |
1565 | */ | |
1566 | if (errno == EINTR) { | |
1567 | goto restart; | |
1568 | } | |
099e26bd DG |
1569 | goto error; |
1570 | } | |
1571 | ||
0d9c5d77 DG |
1572 | nb_fd = ret; |
1573 | ||
5eb91c98 DG |
1574 | for (i = 0; i < nb_fd; i++) { |
1575 | /* Fetch once the poll data */ | |
1576 | revents = LTTNG_POLL_GETEV(&events, i); | |
1577 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1578 | ||
840cb59c | 1579 | health_code_update(); |
44a5e5eb | 1580 | |
fd20dac9 MD |
1581 | if (!revents) { |
1582 | /* No activity for this FD (poll implementation). */ | |
1583 | continue; | |
1584 | } | |
1585 | ||
5eb91c98 | 1586 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 1587 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 1588 | if (ret) { |
139ac872 MD |
1589 | err = 0; |
1590 | goto exit; | |
5eb91c98 | 1591 | } |
099e26bd | 1592 | |
5eb91c98 DG |
1593 | /* Inspect the apps cmd pipe */ |
1594 | if (pollfd == apps_cmd_pipe[0]) { | |
1595 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1596 | ERR("Apps command pipe error"); | |
0177d773 | 1597 | goto error; |
5eb91c98 | 1598 | } else if (revents & LPOLLIN) { |
d0b96690 DG |
1599 | int sock; |
1600 | ||
5eb91c98 | 1601 | /* Empty pipe */ |
6cd525e8 MD |
1602 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
1603 | if (size_ret < sizeof(sock)) { | |
76d7553f | 1604 | PERROR("read apps cmd pipe"); |
5eb91c98 DG |
1605 | goto error; |
1606 | } | |
099e26bd | 1607 | |
840cb59c | 1608 | health_code_update(); |
44a5e5eb | 1609 | |
ffe60014 | 1610 | /* |
d0b96690 DG |
1611 | * We only monitor the error events of the socket. This |
1612 | * thread does not handle any incoming data from UST | |
1613 | * (POLLIN). | |
ffe60014 | 1614 | */ |
d0b96690 DG |
1615 | ret = lttng_poll_add(&events, sock, |
1616 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
1617 | if (ret < 0) { | |
5eb91c98 | 1618 | goto error; |
e0c7ec2b | 1619 | } |
acc7b41b | 1620 | |
d0b96690 | 1621 | DBG("Apps with sock %d added to poll set", sock); |
0177d773 | 1622 | } |
5eb91c98 DG |
1623 | } else { |
1624 | /* | |
54d01ffb DG |
1625 | * At this point, we know that a registered application made |
1626 | * the event at poll_wait. | |
5eb91c98 DG |
1627 | */ |
1628 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1629 | /* Removing from the poll set */ | |
1630 | ret = lttng_poll_del(&events, pollfd); | |
1631 | if (ret < 0) { | |
1632 | goto error; | |
1633 | } | |
099e26bd | 1634 | |
b9d9b220 | 1635 | /* Socket closed on remote end. */ |
56fff090 | 1636 | ust_app_unregister(pollfd); |
5eb91c98 | 1637 | } |
099e26bd | 1638 | } |
44a5e5eb | 1639 | |
840cb59c | 1640 | health_code_update(); |
099e26bd | 1641 | } |
099e26bd DG |
1642 | } |
1643 | ||
139ac872 | 1644 | exit: |
099e26bd | 1645 | error: |
5eb91c98 | 1646 | lttng_poll_clean(&events); |
76d7553f | 1647 | error_poll_create: |
6993eeb3 | 1648 | error_testpoint: |
6620da75 DG |
1649 | utils_close_pipe(apps_cmd_pipe); |
1650 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; | |
1651 | ||
1652 | /* | |
1653 | * We don't clean the UST app hash table here since already registered | |
1654 | * applications can still be controlled so let them be until the session | |
1655 | * daemon dies or the applications stop. | |
1656 | */ | |
1657 | ||
139ac872 | 1658 | if (err) { |
840cb59c | 1659 | health_error(); |
139ac872 MD |
1660 | ERR("Health error occurred in %s", __func__); |
1661 | } | |
8782cc74 | 1662 | health_unregister(health_sessiond); |
76d7553f | 1663 | DBG("Application communication apps thread cleanup complete"); |
f6a9efaa DG |
1664 | rcu_thread_offline(); |
1665 | rcu_unregister_thread(); | |
099e26bd DG |
1666 | return NULL; |
1667 | } | |
1668 | ||
d0b96690 | 1669 | /* |
d88aee68 DG |
1670 | * Send a socket to a thread This is called from the dispatch UST registration |
1671 | * thread once all sockets are set for the application. | |
d0b96690 | 1672 | * |
b85dc84c DG |
1673 | * The sock value can be invalid, we don't really care, the thread will handle |
1674 | * it and make the necessary cleanup if so. | |
1675 | * | |
d0b96690 DG |
1676 | * On success, return 0 else a negative value being the errno message of the |
1677 | * write(). | |
1678 | */ | |
d88aee68 | 1679 | static int send_socket_to_thread(int fd, int sock) |
d0b96690 | 1680 | { |
6cd525e8 | 1681 | ssize_t ret; |
d0b96690 | 1682 | |
b85dc84c DG |
1683 | /* |
1684 | * It's possible that the FD is set as invalid with -1 concurrently just | |
1685 | * before calling this function being a shutdown state of the thread. | |
1686 | */ | |
1687 | if (fd < 0) { | |
1688 | ret = -EBADF; | |
1689 | goto error; | |
1690 | } | |
d0b96690 | 1691 | |
6cd525e8 MD |
1692 | ret = lttng_write(fd, &sock, sizeof(sock)); |
1693 | if (ret < sizeof(sock)) { | |
d88aee68 | 1694 | PERROR("write apps pipe %d", fd); |
d0b96690 DG |
1695 | if (ret < 0) { |
1696 | ret = -errno; | |
1697 | } | |
1698 | goto error; | |
1699 | } | |
1700 | ||
1701 | /* All good. Don't send back the write positive ret value. */ | |
1702 | ret = 0; | |
1703 | error: | |
6cd525e8 | 1704 | return (int) ret; |
d0b96690 DG |
1705 | } |
1706 | ||
f45e313d DG |
1707 | /* |
1708 | * Sanitize the wait queue of the dispatch registration thread meaning removing | |
1709 | * invalid nodes from it. This is to avoid memory leaks for the case the UST | |
1710 | * notify socket is never received. | |
1711 | */ | |
1712 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) | |
1713 | { | |
1714 | int ret, nb_fd = 0, i; | |
1715 | unsigned int fd_added = 0; | |
1716 | struct lttng_poll_event events; | |
1717 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; | |
1718 | ||
1719 | assert(wait_queue); | |
1720 | ||
1721 | lttng_poll_init(&events); | |
1722 | ||
1723 | /* Just skip everything for an empty queue. */ | |
1724 | if (!wait_queue->count) { | |
1725 | goto end; | |
1726 | } | |
1727 | ||
1728 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); | |
1729 | if (ret < 0) { | |
1730 | goto error_create; | |
1731 | } | |
1732 | ||
1733 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
1734 | &wait_queue->head, head) { | |
1735 | assert(wait_node->app); | |
1736 | ret = lttng_poll_add(&events, wait_node->app->sock, | |
1737 | LPOLLHUP | LPOLLERR); | |
1738 | if (ret < 0) { | |
1739 | goto error; | |
1740 | } | |
1741 | ||
1742 | fd_added = 1; | |
1743 | } | |
1744 | ||
1745 | if (!fd_added) { | |
1746 | goto end; | |
1747 | } | |
1748 | ||
1749 | /* | |
1750 | * Poll but don't block so we can quickly identify the faulty events and | |
1751 | * clean them afterwards from the wait queue. | |
1752 | */ | |
1753 | ret = lttng_poll_wait(&events, 0); | |
1754 | if (ret < 0) { | |
1755 | goto error; | |
1756 | } | |
1757 | nb_fd = ret; | |
1758 | ||
1759 | for (i = 0; i < nb_fd; i++) { | |
1760 | /* Get faulty FD. */ | |
1761 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1762 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1763 | ||
fd20dac9 MD |
1764 | if (!revents) { |
1765 | /* No activity for this FD (poll implementation). */ | |
1766 | continue; | |
1767 | } | |
1768 | ||
f45e313d DG |
1769 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
1770 | &wait_queue->head, head) { | |
1771 | if (pollfd == wait_node->app->sock && | |
1772 | (revents & (LPOLLHUP | LPOLLERR))) { | |
1773 | cds_list_del(&wait_node->head); | |
1774 | wait_queue->count--; | |
1775 | ust_app_destroy(wait_node->app); | |
1776 | free(wait_node); | |
1777 | break; | |
1778 | } | |
1779 | } | |
1780 | } | |
1781 | ||
1782 | if (nb_fd > 0) { | |
1783 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); | |
1784 | } | |
1785 | ||
1786 | end: | |
1787 | lttng_poll_clean(&events); | |
1788 | return; | |
1789 | ||
1790 | error: | |
1791 | lttng_poll_clean(&events); | |
1792 | error_create: | |
1793 | ERR("Unable to sanitize wait queue"); | |
1794 | return; | |
1795 | } | |
1796 | ||
099e26bd DG |
1797 | /* |
1798 | * Dispatch request from the registration threads to the application | |
1799 | * communication thread. | |
1800 | */ | |
1801 | static void *thread_dispatch_ust_registration(void *data) | |
1802 | { | |
12e2b881 | 1803 | int ret, err = -1; |
8bdee6e2 | 1804 | struct cds_wfcq_node *node; |
099e26bd | 1805 | struct ust_command *ust_cmd = NULL; |
f45e313d DG |
1806 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
1807 | struct ust_reg_wait_queue wait_queue = { | |
1808 | .count = 0, | |
1809 | }; | |
d0b96690 | 1810 | |
6c71277b | 1811 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
12e2b881 | 1812 | |
9ad42ec1 MD |
1813 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
1814 | goto error_testpoint; | |
1815 | } | |
1816 | ||
12e2b881 MD |
1817 | health_code_update(); |
1818 | ||
f45e313d | 1819 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
099e26bd DG |
1820 | |
1821 | DBG("[thread] Dispatch UST command started"); | |
1822 | ||
26c9d55e | 1823 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
12e2b881 MD |
1824 | health_code_update(); |
1825 | ||
099e26bd DG |
1826 | /* Atomically prepare the queue futex */ |
1827 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1828 | ||
1829 | do { | |
d0b96690 | 1830 | struct ust_app *app = NULL; |
7972aab2 | 1831 | ust_cmd = NULL; |
d0b96690 | 1832 | |
f45e313d DG |
1833 | /* |
1834 | * Make sure we don't have node(s) that have hung up before receiving | |
1835 | * the notify socket. This is to clean the list in order to avoid | |
1836 | * memory leaks from notify socket that are never seen. | |
1837 | */ | |
1838 | sanitize_wait_queue(&wait_queue); | |
1839 | ||
12e2b881 | 1840 | health_code_update(); |
099e26bd | 1841 | /* Dequeue command for registration */ |
8bdee6e2 | 1842 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 1843 | if (node == NULL) { |
00a17c97 | 1844 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1845 | /* Continue thread execution */ |
1846 | break; | |
1847 | } | |
1848 | ||
1849 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1850 | ||
2f50c8a3 DG |
1851 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1852 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1853 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1854 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1855 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1856 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
d0b96690 DG |
1857 | |
1858 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { | |
1859 | wait_node = zmalloc(sizeof(*wait_node)); | |
1860 | if (!wait_node) { | |
1861 | PERROR("zmalloc wait_node dispatch"); | |
020d7f60 DG |
1862 | ret = close(ust_cmd->sock); |
1863 | if (ret < 0) { | |
1864 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1865 | } | |
51dec90d | 1866 | lttng_fd_put(LTTNG_FD_APPS, 1); |
7972aab2 | 1867 | free(ust_cmd); |
d0b96690 DG |
1868 | goto error; |
1869 | } | |
1870 | CDS_INIT_LIST_HEAD(&wait_node->head); | |
1871 | ||
1872 | /* Create application object if socket is CMD. */ | |
1873 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, | |
1874 | ust_cmd->sock); | |
1875 | if (!wait_node->app) { | |
1876 | ret = close(ust_cmd->sock); | |
1877 | if (ret < 0) { | |
1878 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
6620da75 | 1879 | } |
51dec90d | 1880 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 1881 | free(wait_node); |
7972aab2 | 1882 | free(ust_cmd); |
d0b96690 DG |
1883 | continue; |
1884 | } | |
1885 | /* | |
1886 | * Add application to the wait queue so we can set the notify | |
1887 | * socket before putting this object in the global ht. | |
1888 | */ | |
f45e313d DG |
1889 | cds_list_add(&wait_node->head, &wait_queue.head); |
1890 | wait_queue.count++; | |
d0b96690 | 1891 | |
7972aab2 | 1892 | free(ust_cmd); |
d0b96690 DG |
1893 | /* |
1894 | * We have to continue here since we don't have the notify | |
1895 | * socket and the application MUST be added to the hash table | |
1896 | * only at that moment. | |
1897 | */ | |
1898 | continue; | |
1899 | } else { | |
1900 | /* | |
1901 | * Look for the application in the local wait queue and set the | |
1902 | * notify socket if found. | |
1903 | */ | |
d88aee68 | 1904 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
f45e313d | 1905 | &wait_queue.head, head) { |
12e2b881 | 1906 | health_code_update(); |
d0b96690 DG |
1907 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
1908 | wait_node->app->notify_sock = ust_cmd->sock; | |
1909 | cds_list_del(&wait_node->head); | |
f45e313d | 1910 | wait_queue.count--; |
d0b96690 DG |
1911 | app = wait_node->app; |
1912 | free(wait_node); | |
1913 | DBG3("UST app notify socket %d is set", ust_cmd->sock); | |
1914 | break; | |
1915 | } | |
1916 | } | |
020d7f60 DG |
1917 | |
1918 | /* | |
1919 | * With no application at this stage the received socket is | |
1920 | * basically useless so close it before we free the cmd data | |
1921 | * structure for good. | |
1922 | */ | |
1923 | if (!app) { | |
1924 | ret = close(ust_cmd->sock); | |
1925 | if (ret < 0) { | |
1926 | PERROR("close ust sock dispatch %d", ust_cmd->sock); | |
1927 | } | |
51dec90d | 1928 | lttng_fd_put(LTTNG_FD_APPS, 1); |
020d7f60 | 1929 | } |
7972aab2 | 1930 | free(ust_cmd); |
d0b96690 DG |
1931 | } |
1932 | ||
1933 | if (app) { | |
d0b96690 DG |
1934 | /* |
1935 | * @session_lock_list | |
1936 | * | |
1937 | * Lock the global session list so from the register up to the | |
1938 | * registration done message, no thread can see the application | |
1939 | * and change its state. | |
1940 | */ | |
1941 | session_lock_list(); | |
1942 | rcu_read_lock(); | |
d88aee68 | 1943 | |
d0b96690 DG |
1944 | /* |
1945 | * Add application to the global hash table. This needs to be | |
1946 | * done before the update to the UST registry can locate the | |
1947 | * application. | |
1948 | */ | |
1949 | ust_app_add(app); | |
d88aee68 DG |
1950 | |
1951 | /* Set app version. This call will print an error if needed. */ | |
1952 | (void) ust_app_version(app); | |
1953 | ||
1954 | /* Send notify socket through the notify pipe. */ | |
1955 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], | |
1956 | app->notify_sock); | |
1957 | if (ret < 0) { | |
1958 | rcu_read_unlock(); | |
1959 | session_unlock_list(); | |
b85dc84c DG |
1960 | /* |
1961 | * No notify thread, stop the UST tracing. However, this is | |
1962 | * not an internal error of the this thread thus setting | |
1963 | * the health error code to a normal exit. | |
1964 | */ | |
1965 | err = 0; | |
d88aee68 | 1966 | goto error; |
6620da75 | 1967 | } |
d88aee68 | 1968 | |
d0b96690 DG |
1969 | /* |
1970 | * Update newly registered application with the tracing | |
1971 | * registry info already enabled information. | |
1972 | */ | |
1973 | update_ust_app(app->sock); | |
d88aee68 DG |
1974 | |
1975 | /* | |
1976 | * Don't care about return value. Let the manage apps threads | |
1977 | * handle app unregistration upon socket close. | |
1978 | */ | |
1979 | (void) ust_app_register_done(app->sock); | |
1980 | ||
1981 | /* | |
1982 | * Even if the application socket has been closed, send the app | |
1983 | * to the thread and unregistration will take place at that | |
1984 | * place. | |
1985 | */ | |
1986 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); | |
d0b96690 | 1987 | if (ret < 0) { |
d88aee68 DG |
1988 | rcu_read_unlock(); |
1989 | session_unlock_list(); | |
b85dc84c DG |
1990 | /* |
1991 | * No apps. thread, stop the UST tracing. However, this is | |
1992 | * not an internal error of the this thread thus setting | |
1993 | * the health error code to a normal exit. | |
1994 | */ | |
1995 | err = 0; | |
d88aee68 | 1996 | goto error; |
d0b96690 | 1997 | } |
d88aee68 | 1998 | |
d0b96690 DG |
1999 | rcu_read_unlock(); |
2000 | session_unlock_list(); | |
099e26bd | 2001 | } |
099e26bd DG |
2002 | } while (node != NULL); |
2003 | ||
12e2b881 | 2004 | health_poll_entry(); |
099e26bd DG |
2005 | /* Futex wait on queue. Blocking call on futex() */ |
2006 | futex_nto1_wait(&ust_cmd_queue.futex); | |
12e2b881 | 2007 | health_poll_exit(); |
099e26bd | 2008 | } |
12e2b881 MD |
2009 | /* Normal exit, no error */ |
2010 | err = 0; | |
099e26bd DG |
2011 | |
2012 | error: | |
d88aee68 DG |
2013 | /* Clean up wait queue. */ |
2014 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, | |
f45e313d | 2015 | &wait_queue.head, head) { |
d88aee68 | 2016 | cds_list_del(&wait_node->head); |
f45e313d | 2017 | wait_queue.count--; |
d88aee68 DG |
2018 | free(wait_node); |
2019 | } | |
2020 | ||
9ad42ec1 | 2021 | error_testpoint: |
099e26bd | 2022 | DBG("Dispatch thread dying"); |
12e2b881 MD |
2023 | if (err) { |
2024 | health_error(); | |
2025 | ERR("Health error occurred in %s", __func__); | |
2026 | } | |
8782cc74 | 2027 | health_unregister(health_sessiond); |
099e26bd DG |
2028 | return NULL; |
2029 | } | |
2030 | ||
2031 | /* | |
2032 | * This thread manage application registration. | |
2033 | */ | |
2034 | static void *thread_registration_apps(void *data) | |
1d4b027a | 2035 | { |
139ac872 | 2036 | int sock = -1, i, ret, pollfd, err = -1; |
5eb91c98 DG |
2037 | uint32_t revents, nb_fd; |
2038 | struct lttng_poll_event events; | |
099e26bd DG |
2039 | /* |
2040 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
2041 | * freed in the manage apps thread. | |
2042 | */ | |
2043 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 2044 | |
099e26bd | 2045 | DBG("[thread] Manage application registration started"); |
1d4b027a | 2046 | |
6c71277b | 2047 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
927ca06a | 2048 | |
e547b070 | 2049 | if (testpoint(sessiond_thread_registration_apps)) { |
6993eeb3 CB |
2050 | goto error_testpoint; |
2051 | } | |
8ac94142 | 2052 | |
1d4b027a DG |
2053 | ret = lttcomm_listen_unix_sock(apps_sock); |
2054 | if (ret < 0) { | |
76d7553f | 2055 | goto error_listen; |
1d4b027a DG |
2056 | } |
2057 | ||
5eb91c98 DG |
2058 | /* |
2059 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
2060 | * more will be added to this poll set. | |
2061 | */ | |
d0b96690 | 2062 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 2063 | if (ret < 0) { |
76d7553f | 2064 | goto error_create_poll; |
5eb91c98 | 2065 | } |
273ea72c | 2066 | |
5eb91c98 DG |
2067 | /* Add the application registration socket */ |
2068 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
2069 | if (ret < 0) { | |
76d7553f | 2070 | goto error_poll_add; |
5eb91c98 | 2071 | } |
273ea72c | 2072 | |
1d4b027a | 2073 | /* Notify all applications to register */ |
0fdd1e2c DG |
2074 | ret = notify_ust_apps(1); |
2075 | if (ret < 0) { | |
2076 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
2077 | "Execution continues but there might be problem for already\n" |
2078 | "running applications that wishes to register."); | |
0fdd1e2c | 2079 | } |
1d4b027a DG |
2080 | |
2081 | while (1) { | |
2082 | DBG("Accepting application registration"); | |
273ea72c DG |
2083 | |
2084 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 2085 | restart: |
a78af745 | 2086 | health_poll_entry(); |
5eb91c98 | 2087 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 2088 | health_poll_exit(); |
273ea72c | 2089 | if (ret < 0) { |
88f2b785 MD |
2090 | /* |
2091 | * Restart interrupted system call. | |
2092 | */ | |
2093 | if (errno == EINTR) { | |
2094 | goto restart; | |
2095 | } | |
273ea72c DG |
2096 | goto error; |
2097 | } | |
2098 | ||
0d9c5d77 DG |
2099 | nb_fd = ret; |
2100 | ||
5eb91c98 | 2101 | for (i = 0; i < nb_fd; i++) { |
840cb59c | 2102 | health_code_update(); |
139ac872 | 2103 | |
5eb91c98 DG |
2104 | /* Fetch once the poll data */ |
2105 | revents = LTTNG_POLL_GETEV(&events, i); | |
2106 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 2107 | |
fd20dac9 MD |
2108 | if (!revents) { |
2109 | /* No activity for this FD (poll implementation). */ | |
2110 | continue; | |
2111 | } | |
2112 | ||
5eb91c98 | 2113 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 2114 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 2115 | if (ret) { |
139ac872 MD |
2116 | err = 0; |
2117 | goto exit; | |
90014c57 | 2118 | } |
1d4b027a | 2119 | |
5eb91c98 DG |
2120 | /* Event on the registration socket */ |
2121 | if (pollfd == apps_sock) { | |
2122 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2123 | ERR("Register apps socket poll error"); | |
2124 | goto error; | |
2125 | } else if (revents & LPOLLIN) { | |
2126 | sock = lttcomm_accept_unix_sock(apps_sock); | |
2127 | if (sock < 0) { | |
2128 | goto error; | |
2129 | } | |
099e26bd | 2130 | |
16c5c8fa DG |
2131 | /* |
2132 | * Set socket timeout for both receiving and ending. | |
2133 | * app_socket_timeout is in seconds, whereas | |
2134 | * lttcomm_setsockopt_rcv_timeout and | |
2135 | * lttcomm_setsockopt_snd_timeout expect msec as | |
2136 | * parameter. | |
2137 | */ | |
2138 | (void) lttcomm_setsockopt_rcv_timeout(sock, | |
2139 | app_socket_timeout * 1000); | |
2140 | (void) lttcomm_setsockopt_snd_timeout(sock, | |
2141 | app_socket_timeout * 1000); | |
2142 | ||
b662582b DG |
2143 | /* |
2144 | * Set the CLOEXEC flag. Return code is useless because | |
2145 | * either way, the show must go on. | |
2146 | */ | |
2147 | (void) utils_set_fd_cloexec(sock); | |
2148 | ||
5eb91c98 | 2149 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 2150 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 2151 | if (ust_cmd == NULL) { |
76d7553f | 2152 | PERROR("ust command zmalloc"); |
5eb91c98 DG |
2153 | goto error; |
2154 | } | |
1d4b027a | 2155 | |
5eb91c98 DG |
2156 | /* |
2157 | * Using message-based transmissions to ensure we don't | |
2158 | * have to deal with partially received messages. | |
2159 | */ | |
4063050c MD |
2160 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
2161 | if (ret < 0) { | |
2162 | ERR("Exhausted file descriptors allowed for applications."); | |
2163 | free(ust_cmd); | |
2164 | ret = close(sock); | |
2165 | if (ret) { | |
2166 | PERROR("close"); | |
2167 | } | |
2168 | sock = -1; | |
2169 | continue; | |
2170 | } | |
d88aee68 | 2171 | |
840cb59c | 2172 | health_code_update(); |
d0b96690 DG |
2173 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
2174 | if (ret < 0) { | |
5eb91c98 | 2175 | free(ust_cmd); |
d0b96690 | 2176 | /* Close socket of the application. */ |
76d7553f MD |
2177 | ret = close(sock); |
2178 | if (ret) { | |
2179 | PERROR("close"); | |
2180 | } | |
4063050c | 2181 | lttng_fd_put(LTTNG_FD_APPS, 1); |
76d7553f | 2182 | sock = -1; |
5eb91c98 DG |
2183 | continue; |
2184 | } | |
840cb59c | 2185 | health_code_update(); |
099e26bd | 2186 | |
5eb91c98 | 2187 | ust_cmd->sock = sock; |
34a2494f | 2188 | sock = -1; |
099e26bd | 2189 | |
5eb91c98 DG |
2190 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
2191 | " gid:%d sock:%d name:%s (version %d.%d)", | |
2192 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
2193 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
2194 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
2195 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 2196 | |
5eb91c98 DG |
2197 | /* |
2198 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 2199 | * has been taken! This apps will be part of the *system*. |
5eb91c98 | 2200 | */ |
8bdee6e2 | 2201 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
5eb91c98 DG |
2202 | |
2203 | /* | |
2204 | * Wake the registration queue futex. Implicit memory | |
8bdee6e2 | 2205 | * barrier with the exchange in cds_wfcq_enqueue. |
5eb91c98 DG |
2206 | */ |
2207 | futex_nto1_wake(&ust_cmd_queue.futex); | |
2208 | } | |
2209 | } | |
90014c57 | 2210 | } |
1d4b027a DG |
2211 | } |
2212 | ||
139ac872 | 2213 | exit: |
1d4b027a | 2214 | error: |
0fdd1e2c DG |
2215 | /* Notify that the registration thread is gone */ |
2216 | notify_ust_apps(0); | |
2217 | ||
a4b35e07 | 2218 | if (apps_sock >= 0) { |
76d7553f MD |
2219 | ret = close(apps_sock); |
2220 | if (ret) { | |
2221 | PERROR("close"); | |
2222 | } | |
a4b35e07 | 2223 | } |
46c3f085 | 2224 | if (sock >= 0) { |
76d7553f MD |
2225 | ret = close(sock); |
2226 | if (ret) { | |
2227 | PERROR("close"); | |
2228 | } | |
4063050c | 2229 | lttng_fd_put(LTTNG_FD_APPS, 1); |
a4b35e07 | 2230 | } |
273ea72c | 2231 | unlink(apps_unix_sock_path); |
0fdd1e2c | 2232 | |
76d7553f | 2233 | error_poll_add: |
5eb91c98 | 2234 | lttng_poll_clean(&events); |
76d7553f MD |
2235 | error_listen: |
2236 | error_create_poll: | |
6993eeb3 | 2237 | error_testpoint: |
76d7553f | 2238 | DBG("UST Registration thread cleanup complete"); |
9ad42ec1 MD |
2239 | if (err) { |
2240 | health_error(); | |
2241 | ERR("Health error occurred in %s", __func__); | |
2242 | } | |
8782cc74 | 2243 | health_unregister(health_sessiond); |
5eb91c98 | 2244 | |
1d4b027a DG |
2245 | return NULL; |
2246 | } | |
2247 | ||
8c0faa1d | 2248 | /* |
3bd1e081 | 2249 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 2250 | * exec or it will fails. |
8c0faa1d | 2251 | */ |
3bd1e081 | 2252 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d | 2253 | { |
a23ec3a7 | 2254 | int ret, clock_ret; |
ee0b0061 DG |
2255 | struct timespec timeout; |
2256 | ||
a23ec3a7 DG |
2257 | /* Make sure we set the readiness flag to 0 because we are NOT ready */ |
2258 | consumer_data->consumer_thread_is_ready = 0; | |
8c0faa1d | 2259 | |
a23ec3a7 DG |
2260 | /* Setup pthread condition */ |
2261 | ret = pthread_condattr_init(&consumer_data->condattr); | |
4a15001e | 2262 | if (ret) { |
a23ec3a7 DG |
2263 | errno = ret; |
2264 | PERROR("pthread_condattr_init consumer data"); | |
2265 | goto error; | |
2266 | } | |
2267 | ||
2268 | /* | |
2269 | * Set the monotonic clock in order to make sure we DO NOT jump in time | |
2270 | * between the clock_gettime() call and the timedwait call. See bug #324 | |
2271 | * for a more details and how we noticed it. | |
2272 | */ | |
2273 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); | |
4a15001e | 2274 | if (ret) { |
a23ec3a7 DG |
2275 | errno = ret; |
2276 | PERROR("pthread_condattr_setclock consumer data"); | |
ee0b0061 DG |
2277 | goto error; |
2278 | } | |
8c0faa1d | 2279 | |
a23ec3a7 | 2280 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
4a15001e | 2281 | if (ret) { |
a23ec3a7 DG |
2282 | errno = ret; |
2283 | PERROR("pthread_cond_init consumer data"); | |
2284 | goto error; | |
2285 | } | |
2286 | ||
2287 | ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer, | |
2288 | consumer_data); | |
4a15001e MD |
2289 | if (ret) { |
2290 | errno = ret; | |
3bd1e081 | 2291 | PERROR("pthread_create consumer"); |
ee0b0061 | 2292 | ret = -1; |
8c0faa1d DG |
2293 | goto error; |
2294 | } | |
2295 | ||
a23ec3a7 DG |
2296 | /* We are about to wait on a pthread condition */ |
2297 | pthread_mutex_lock(&consumer_data->cond_mutex); | |
2298 | ||
ee0b0061 | 2299 | /* Get time for sem_timedwait absolute timeout */ |
a23ec3a7 DG |
2300 | clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout); |
2301 | /* | |
2302 | * Set the timeout for the condition timed wait even if the clock gettime | |
2303 | * call fails since we might loop on that call and we want to avoid to | |
2304 | * increment the timeout too many times. | |
2305 | */ | |
2306 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
2307 | ||
2308 | /* | |
2309 | * The following loop COULD be skipped in some conditions so this is why we | |
2310 | * set ret to 0 in order to make sure at least one round of the loop is | |
2311 | * done. | |
2312 | */ | |
2313 | ret = 0; | |
2314 | ||
2315 | /* | |
2316 | * Loop until the condition is reached or when a timeout is reached. Note | |
2317 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT | |
2318 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is | |
2319 | * possible. This loop does not take any chances and works with both of | |
2320 | * them. | |
2321 | */ | |
2322 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { | |
2323 | if (clock_ret < 0) { | |
2324 | PERROR("clock_gettime spawn consumer"); | |
2325 | /* Infinite wait for the consumerd thread to be ready */ | |
2326 | ret = pthread_cond_wait(&consumer_data->cond, | |
2327 | &consumer_data->cond_mutex); | |
2328 | } else { | |
2329 | ret = pthread_cond_timedwait(&consumer_data->cond, | |
2330 | &consumer_data->cond_mutex, &timeout); | |
2331 | } | |
ee0b0061 | 2332 | } |
8c0faa1d | 2333 | |
a23ec3a7 DG |
2334 | /* Release the pthread condition */ |
2335 | pthread_mutex_unlock(&consumer_data->cond_mutex); | |
2336 | ||
2337 | if (ret != 0) { | |
2338 | errno = ret; | |
2339 | if (ret == ETIMEDOUT) { | |
4282f9a3 DG |
2340 | int pth_ret; |
2341 | ||
ee0b0061 DG |
2342 | /* |
2343 | * Call has timed out so we kill the kconsumerd_thread and return | |
2344 | * an error. | |
2345 | */ | |
a23ec3a7 DG |
2346 | ERR("Condition timed out. The consumer thread was never ready." |
2347 | " Killing it"); | |
4282f9a3 DG |
2348 | pth_ret = pthread_cancel(consumer_data->thread); |
2349 | if (pth_ret < 0) { | |
3bd1e081 | 2350 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
2351 | } |
2352 | } else { | |
a23ec3a7 | 2353 | PERROR("pthread_cond_wait failed consumer thread"); |
ee0b0061 | 2354 | } |
4282f9a3 DG |
2355 | /* Caller is expecting a negative value on failure. */ |
2356 | ret = -1; | |
ee0b0061 DG |
2357 | goto error; |
2358 | } | |
2359 | ||
3bd1e081 MD |
2360 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2361 | if (consumer_data->pid == 0) { | |
a23ec3a7 | 2362 | ERR("Consumerd did not start"); |
3bd1e081 | 2363 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
2364 | goto error; |
2365 | } | |
3bd1e081 | 2366 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 2367 | |
8c0faa1d DG |
2368 | return 0; |
2369 | ||
2370 | error: | |
2371 | return ret; | |
2372 | } | |
2373 | ||
d9800920 | 2374 | /* |
3bd1e081 | 2375 | * Join consumer thread |
d9800920 | 2376 | */ |
3bd1e081 | 2377 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
2378 | { |
2379 | void *status; | |
cf3af59e | 2380 | |
e8209f6b DG |
2381 | /* Consumer pid must be a real one. */ |
2382 | if (consumer_data->pid > 0) { | |
c617c0c6 | 2383 | int ret; |
3bd1e081 | 2384 | ret = kill(consumer_data->pid, SIGTERM); |
cf3af59e | 2385 | if (ret) { |
4a15001e | 2386 | PERROR("Error killing consumer daemon"); |
cf3af59e MD |
2387 | return ret; |
2388 | } | |
3bd1e081 | 2389 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
2390 | } else { |
2391 | return 0; | |
2392 | } | |
2393 | } | |
2394 | ||
8c0faa1d | 2395 | /* |
3bd1e081 | 2396 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 2397 | * |
d063d709 | 2398 | * Return pid if successful else -1. |
8c0faa1d | 2399 | */ |
3bd1e081 | 2400 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
2401 | { |
2402 | int ret; | |
2403 | pid_t pid; | |
94c55f17 | 2404 | const char *consumer_to_use; |
53086306 | 2405 | const char *verbosity; |
94c55f17 | 2406 | struct stat st; |
8c0faa1d | 2407 | |
3bd1e081 | 2408 | DBG("Spawning consumerd"); |
c49dc785 | 2409 | |
8c0faa1d DG |
2410 | pid = fork(); |
2411 | if (pid == 0) { | |
2412 | /* | |
3bd1e081 | 2413 | * Exec consumerd. |
8c0faa1d | 2414 | */ |
daee5345 | 2415 | if (opt_verbose_consumer) { |
53086306 | 2416 | verbosity = "--verbose"; |
4421f712 | 2417 | } else if (lttng_opt_quiet) { |
53086306 | 2418 | verbosity = "--quiet"; |
4421f712 DG |
2419 | } else { |
2420 | verbosity = ""; | |
53086306 | 2421 | } |
4421f712 | 2422 | |
3bd1e081 MD |
2423 | switch (consumer_data->type) { |
2424 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 2425 | /* |
c7704d57 DG |
2426 | * Find out which consumerd to execute. We will first try the |
2427 | * 64-bit path, then the sessiond's installation directory, and | |
2428 | * fallback on the 32-bit one, | |
94c55f17 | 2429 | */ |
63a799e8 AM |
2430 | DBG3("Looking for a kernel consumer at these locations:"); |
2431 | DBG3(" 1) %s", consumerd64_bin); | |
2432 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE); | |
2433 | DBG3(" 3) %s", consumerd32_bin); | |
94c55f17 | 2434 | if (stat(consumerd64_bin, &st) == 0) { |
63a799e8 | 2435 | DBG3("Found location #1"); |
94c55f17 | 2436 | consumer_to_use = consumerd64_bin; |
94c55f17 | 2437 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
63a799e8 | 2438 | DBG3("Found location #2"); |
94c55f17 | 2439 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
eb1e0bd4 | 2440 | } else if (stat(consumerd32_bin, &st) == 0) { |
63a799e8 | 2441 | DBG3("Found location #3"); |
eb1e0bd4 | 2442 | consumer_to_use = consumerd32_bin; |
94c55f17 | 2443 | } else { |
63a799e8 | 2444 | DBG("Could not find any valid consumerd executable"); |
4282f9a3 | 2445 | ret = -EINVAL; |
94c55f17 AM |
2446 | break; |
2447 | } | |
2448 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
4282f9a3 | 2449 | ret = execl(consumer_to_use, |
94c55f17 AM |
2450 | "lttng-consumerd", verbosity, "-k", |
2451 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
2452 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2453 | "--group", tracing_group_name, |
94c55f17 | 2454 | NULL); |
3bd1e081 | 2455 | break; |
7753dea8 MD |
2456 | case LTTNG_CONSUMER64_UST: |
2457 | { | |
b1e0b6b6 | 2458 | char *tmpnew = NULL; |
8f4905da MD |
2459 | |
2460 | if (consumerd64_libdir[0] != '\0') { | |
2461 | char *tmp; | |
2462 | size_t tmplen; | |
2463 | ||
e8fa9fb0 | 2464 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2465 | if (!tmp) { |
2466 | tmp = ""; | |
2467 | } | |
2468 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2469 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
2470 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2471 | if (!tmpnew) { | |
2472 | ret = -ENOMEM; | |
2473 | goto error; | |
2474 | } | |
2475 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2476 | strcat(tmpnew, consumerd64_libdir); | |
2477 | if (tmp[0] != '\0') { | |
2478 | strcat(tmpnew, ":"); | |
2479 | strcat(tmpnew, tmp); | |
2480 | } | |
2481 | ret = putenv(tmpnew); | |
2482 | if (ret) { | |
2483 | ret = -errno; | |
c6f76da9 | 2484 | free(tmpnew); |
8f4905da MD |
2485 | goto error; |
2486 | } | |
2487 | } | |
94c55f17 | 2488 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 2489 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2490 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2491 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2492 | "--group", tracing_group_name, |
7753dea8 | 2493 | NULL); |
8f4905da MD |
2494 | if (consumerd64_libdir[0] != '\0') { |
2495 | free(tmpnew); | |
2496 | } | |
3bd1e081 | 2497 | break; |
7753dea8 MD |
2498 | } |
2499 | case LTTNG_CONSUMER32_UST: | |
2500 | { | |
937dde8e | 2501 | char *tmpnew = NULL; |
8f4905da MD |
2502 | |
2503 | if (consumerd32_libdir[0] != '\0') { | |
2504 | char *tmp; | |
2505 | size_t tmplen; | |
2506 | ||
e8fa9fb0 | 2507 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
8f4905da MD |
2508 | if (!tmp) { |
2509 | tmp = ""; | |
2510 | } | |
2511 | tmplen = strlen("LD_LIBRARY_PATH=") | |
2512 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
2513 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
2514 | if (!tmpnew) { | |
2515 | ret = -ENOMEM; | |
2516 | goto error; | |
2517 | } | |
2518 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
2519 | strcat(tmpnew, consumerd32_libdir); | |
2520 | if (tmp[0] != '\0') { | |
2521 | strcat(tmpnew, ":"); | |
2522 | strcat(tmpnew, tmp); | |
2523 | } | |
2524 | ret = putenv(tmpnew); | |
2525 | if (ret) { | |
2526 | ret = -errno; | |
c6f76da9 | 2527 | free(tmpnew); |
8f4905da MD |
2528 | goto error; |
2529 | } | |
2530 | } | |
94c55f17 | 2531 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 2532 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
2533 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
2534 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
6c71277b | 2535 | "--group", tracing_group_name, |
7753dea8 | 2536 | NULL); |
8f4905da MD |
2537 | if (consumerd32_libdir[0] != '\0') { |
2538 | free(tmpnew); | |
2539 | } | |
7753dea8 MD |
2540 | break; |
2541 | } | |
3bd1e081 | 2542 | default: |
76d7553f | 2543 | PERROR("unknown consumer type"); |
3bd1e081 MD |
2544 | exit(EXIT_FAILURE); |
2545 | } | |
8c0faa1d | 2546 | if (errno != 0) { |
4282f9a3 | 2547 | PERROR("Consumer execl()"); |
8c0faa1d | 2548 | } |
4282f9a3 | 2549 | /* Reaching this point, we got a failure on our execl(). */ |
8c0faa1d DG |
2550 | exit(EXIT_FAILURE); |
2551 | } else if (pid > 0) { | |
2552 | ret = pid; | |
8c0faa1d | 2553 | } else { |
76d7553f | 2554 | PERROR("start consumer fork"); |
8c0faa1d | 2555 | ret = -errno; |
8c0faa1d | 2556 | } |
8f4905da | 2557 | error: |
8c0faa1d DG |
2558 | return ret; |
2559 | } | |
2560 | ||
693bd40b | 2561 | /* |
3bd1e081 | 2562 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 2563 | */ |
3bd1e081 | 2564 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b | 2565 | { |
c617c0c6 | 2566 | int ret; |
edb8b045 DG |
2567 | |
2568 | /* | |
2569 | * Set the listen() state on the socket since there is a possible race | |
2570 | * between the exec() of the consumer daemon and this call if place in the | |
2571 | * consumer thread. See bug #366 for more details. | |
2572 | */ | |
2573 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
2574 | if (ret < 0) { | |
2575 | goto error; | |
2576 | } | |
693bd40b | 2577 | |
3bd1e081 MD |
2578 | pthread_mutex_lock(&consumer_data->pid_mutex); |
2579 | if (consumer_data->pid != 0) { | |
2580 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
2581 | goto end; |
2582 | } | |
693bd40b | 2583 | |
3bd1e081 | 2584 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 2585 | if (ret < 0) { |
3bd1e081 MD |
2586 | ERR("Spawning consumerd failed"); |
2587 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 2588 | goto error; |
693bd40b | 2589 | } |
c49dc785 | 2590 | |
3bd1e081 MD |
2591 | /* Setting up the consumer_data pid */ |
2592 | consumer_data->pid = ret; | |
48842b30 | 2593 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 2594 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 2595 | |
3bd1e081 MD |
2596 | DBG2("Spawning consumer control thread"); |
2597 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 2598 | if (ret < 0) { |
3bd1e081 | 2599 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
2600 | goto error; |
2601 | } | |
2602 | ||
c49dc785 | 2603 | end: |
693bd40b DG |
2604 | return 0; |
2605 | ||
2606 | error: | |
331744e3 | 2607 | /* Cleanup already created sockets on error. */ |
edb8b045 | 2608 | if (consumer_data->err_sock >= 0) { |
c617c0c6 MD |
2609 | int err; |
2610 | ||
edb8b045 DG |
2611 | err = close(consumer_data->err_sock); |
2612 | if (err < 0) { | |
2613 | PERROR("close consumer data error socket"); | |
2614 | } | |
2615 | } | |
693bd40b DG |
2616 | return ret; |
2617 | } | |
2618 | ||
b73401da | 2619 | /* |
096102bd | 2620 | * Setup necessary data for kernel tracer action. |
b73401da | 2621 | */ |
096102bd | 2622 | static int init_kernel_tracer(void) |
b73401da DG |
2623 | { |
2624 | int ret; | |
b73401da | 2625 | |
096102bd DG |
2626 | /* Modprobe lttng kernel modules */ |
2627 | ret = modprobe_lttng_control(); | |
b73401da | 2628 | if (ret < 0) { |
b73401da DG |
2629 | goto error; |
2630 | } | |
2631 | ||
096102bd DG |
2632 | /* Open debugfs lttng */ |
2633 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); | |
2634 | if (kernel_tracer_fd < 0) { | |
2635 | DBG("Failed to open %s", module_proc_lttng); | |
2f77fc4b DG |
2636 | ret = -1; |
2637 | goto error_open; | |
54d01ffb DG |
2638 | } |
2639 | ||
2f77fc4b DG |
2640 | /* Validate kernel version */ |
2641 | ret = kernel_validate_version(kernel_tracer_fd); | |
2642 | if (ret < 0) { | |
2643 | goto error_version; | |
b551a063 | 2644 | } |
54d01ffb | 2645 | |
2f77fc4b DG |
2646 | ret = modprobe_lttng_data(); |
2647 | if (ret < 0) { | |
2648 | goto error_modules; | |
54d01ffb DG |
2649 | } |
2650 | ||
2f77fc4b DG |
2651 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
2652 | return 0; | |
2653 | ||
2654 | error_version: | |
2655 | modprobe_remove_lttng_control(); | |
2656 | ret = close(kernel_tracer_fd); | |
2657 | if (ret) { | |
2658 | PERROR("close"); | |
b551a063 | 2659 | } |
2f77fc4b | 2660 | kernel_tracer_fd = -1; |
f73fabfd | 2661 | return LTTNG_ERR_KERN_VERSION; |
b551a063 | 2662 | |
2f77fc4b DG |
2663 | error_modules: |
2664 | ret = close(kernel_tracer_fd); | |
2665 | if (ret) { | |
2666 | PERROR("close"); | |
b551a063 | 2667 | } |
54d01ffb | 2668 | |
2f77fc4b DG |
2669 | error_open: |
2670 | modprobe_remove_lttng_control(); | |
54d01ffb DG |
2671 | |
2672 | error: | |
2f77fc4b DG |
2673 | WARN("No kernel tracer available"); |
2674 | kernel_tracer_fd = -1; | |
2675 | if (!is_root) { | |
f73fabfd | 2676 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
2f77fc4b | 2677 | } else { |
f73fabfd | 2678 | return LTTNG_ERR_KERN_NA; |
2f77fc4b | 2679 | } |
54d01ffb DG |
2680 | } |
2681 | ||
2f77fc4b | 2682 | |
54d01ffb | 2683 | /* |
2f77fc4b DG |
2684 | * Copy consumer output from the tracing session to the domain session. The |
2685 | * function also applies the right modification on a per domain basis for the | |
2686 | * trace files destination directory. | |
36b588ed MD |
2687 | * |
2688 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2689 | */ |
2f77fc4b | 2690 | static int copy_session_consumer(int domain, struct ltt_session *session) |
54d01ffb DG |
2691 | { |
2692 | int ret; | |
2f77fc4b DG |
2693 | const char *dir_name; |
2694 | struct consumer_output *consumer; | |
2695 | ||
2696 | assert(session); | |
2697 | assert(session->consumer); | |
54d01ffb | 2698 | |
b551a063 DG |
2699 | switch (domain) { |
2700 | case LTTNG_DOMAIN_KERNEL: | |
2f77fc4b | 2701 | DBG3("Copying tracing session consumer output in kernel session"); |
09a90bcd DG |
2702 | /* |
2703 | * XXX: We should audit the session creation and what this function | |
2704 | * does "extra" in order to avoid a destroy since this function is used | |
2705 | * in the domain session creation (kernel and ust) only. Same for UST | |
2706 | * domain. | |
2707 | */ | |
2708 | if (session->kernel_session->consumer) { | |
2709 | consumer_destroy_output(session->kernel_session->consumer); | |
2710 | } | |
2f77fc4b DG |
2711 | session->kernel_session->consumer = |
2712 | consumer_copy_output(session->consumer); | |
2713 | /* Ease our life a bit for the next part */ | |
2714 | consumer = session->kernel_session->consumer; | |
2715 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
b551a063 | 2716 | break; |
f20baf8e | 2717 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2718 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2719 | case LTTNG_DOMAIN_PYTHON: |
b551a063 | 2720 | case LTTNG_DOMAIN_UST: |
2f77fc4b | 2721 | DBG3("Copying tracing session consumer output in UST session"); |
09a90bcd DG |
2722 | if (session->ust_session->consumer) { |
2723 | consumer_destroy_output(session->ust_session->consumer); | |
2724 | } | |
2f77fc4b DG |
2725 | session->ust_session->consumer = |
2726 | consumer_copy_output(session->consumer); | |
2727 | /* Ease our life a bit for the next part */ | |
2728 | consumer = session->ust_session->consumer; | |
2729 | dir_name = DEFAULT_UST_TRACE_DIR; | |
b551a063 DG |
2730 | break; |
2731 | default: | |
f73fabfd | 2732 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
54d01ffb DG |
2733 | goto error; |
2734 | } | |
2735 | ||
2f77fc4b | 2736 | /* Append correct directory to subdir */ |
c30ce0b3 CB |
2737 | strncat(consumer->subdir, dir_name, |
2738 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); | |
2f77fc4b DG |
2739 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
2740 | ||
f73fabfd | 2741 | ret = LTTNG_OK; |
54d01ffb DG |
2742 | |
2743 | error: | |
2744 | return ret; | |
2745 | } | |
2746 | ||
00e2e675 | 2747 | /* |
2f77fc4b | 2748 | * Create an UST session and add it to the session ust list. |
36b588ed MD |
2749 | * |
2750 | * Should *NOT* be called with RCU read-side lock held. | |
00e2e675 | 2751 | */ |
2f77fc4b DG |
2752 | static int create_ust_session(struct ltt_session *session, |
2753 | struct lttng_domain *domain) | |
00e2e675 DG |
2754 | { |
2755 | int ret; | |
2f77fc4b | 2756 | struct ltt_ust_session *lus = NULL; |
00e2e675 | 2757 | |
a4b92340 | 2758 | assert(session); |
2f77fc4b DG |
2759 | assert(domain); |
2760 | assert(session->consumer); | |
a4b92340 | 2761 | |
2f77fc4b | 2762 | switch (domain->type) { |
f20baf8e | 2763 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 2764 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 2765 | case LTTNG_DOMAIN_PYTHON: |
2f77fc4b DG |
2766 | case LTTNG_DOMAIN_UST: |
2767 | break; | |
2768 | default: | |
2769 | ERR("Unknown UST domain on create session %d", domain->type); | |
f73fabfd | 2770 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
00e2e675 DG |
2771 | goto error; |
2772 | } | |
2773 | ||
2f77fc4b DG |
2774 | DBG("Creating UST session"); |
2775 | ||
dec56f6c | 2776 | lus = trace_ust_create_session(session->id); |
2f77fc4b | 2777 | if (lus == NULL) { |
f73fabfd | 2778 | ret = LTTNG_ERR_UST_SESS_FAIL; |
a4b92340 DG |
2779 | goto error; |
2780 | } | |
2781 | ||
2f77fc4b DG |
2782 | lus->uid = session->uid; |
2783 | lus->gid = session->gid; | |
2bba9e53 | 2784 | lus->output_traces = session->output_traces; |
27babd3a | 2785 | lus->snapshot_mode = session->snapshot_mode; |
ecc48a90 | 2786 | lus->live_timer_interval = session->live_timer; |
2f77fc4b | 2787 | session->ust_session = lus; |
d7ba1388 | 2788 | if (session->shm_path[0]) { |
3d071855 MD |
2789 | strncpy(lus->root_shm_path, session->shm_path, |
2790 | sizeof(lus->root_shm_path)); | |
2791 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2792 | strncpy(lus->shm_path, session->shm_path, |
2793 | sizeof(lus->shm_path)); | |
2794 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
2795 | strncat(lus->shm_path, "/ust", | |
2796 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
2797 | } | |
2f77fc4b DG |
2798 | /* Copy session output to the newly created UST session */ |
2799 | ret = copy_session_consumer(domain->type, session); | |
f73fabfd | 2800 | if (ret != LTTNG_OK) { |
00e2e675 DG |
2801 | goto error; |
2802 | } | |
2803 | ||
f73fabfd | 2804 | return LTTNG_OK; |
00e2e675 DG |
2805 | |
2806 | error: | |
2f77fc4b DG |
2807 | free(lus); |
2808 | session->ust_session = NULL; | |
00e2e675 DG |
2809 | return ret; |
2810 | } | |
2811 | ||
2812 | /* | |
2f77fc4b | 2813 | * Create a kernel tracer session then create the default channel. |
00e2e675 | 2814 | */ |
2f77fc4b | 2815 | static int create_kernel_session(struct ltt_session *session) |
00e2e675 DG |
2816 | { |
2817 | int ret; | |
a4b92340 | 2818 | |
2f77fc4b | 2819 | DBG("Creating kernel session"); |
00e2e675 | 2820 | |
2f77fc4b DG |
2821 | ret = kernel_create_session(session, kernel_tracer_fd); |
2822 | if (ret < 0) { | |
f73fabfd | 2823 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
00e2e675 DG |
2824 | goto error; |
2825 | } | |
2826 | ||
2f77fc4b DG |
2827 | /* Code flow safety */ |
2828 | assert(session->kernel_session); | |
2829 | ||
2830 | /* Copy session output to the newly created Kernel session */ | |
2831 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
f73fabfd | 2832 | if (ret != LTTNG_OK) { |
a4b92340 DG |
2833 | goto error; |
2834 | } | |
2835 | ||
2f77fc4b DG |
2836 | /* Create directory(ies) on local filesystem. */ |
2837 | if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL && | |
2838 | strlen(session->kernel_session->consumer->dst.trace_path) > 0) { | |
2839 | ret = run_as_mkdir_recursive( | |
2840 | session->kernel_session->consumer->dst.trace_path, | |
2841 | S_IRWXU | S_IRWXG, session->uid, session->gid); | |
2842 | if (ret < 0) { | |
2843 | if (ret != -EEXIST) { | |
2844 | ERR("Trace directory creation error"); | |
00e2e675 DG |
2845 | goto error; |
2846 | } | |
00e2e675 | 2847 | } |
2f77fc4b | 2848 | } |
00e2e675 | 2849 | |
2f77fc4b DG |
2850 | session->kernel_session->uid = session->uid; |
2851 | session->kernel_session->gid = session->gid; | |
2bba9e53 | 2852 | session->kernel_session->output_traces = session->output_traces; |
27babd3a | 2853 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
00e2e675 | 2854 | |
f73fabfd | 2855 | return LTTNG_OK; |
00e2e675 | 2856 | |
2f77fc4b DG |
2857 | error: |
2858 | trace_kernel_destroy_session(session->kernel_session); | |
2859 | session->kernel_session = NULL; | |
2860 | return ret; | |
2861 | } | |
00e2e675 | 2862 | |
2f77fc4b DG |
2863 | /* |
2864 | * Count number of session permitted by uid/gid. | |
2865 | */ | |
2866 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
2867 | { | |
2868 | unsigned int i = 0; | |
2869 | struct ltt_session *session; | |
07424f16 | 2870 | |
2f77fc4b DG |
2871 | DBG("Counting number of available session for UID %d GID %d", |
2872 | uid, gid); | |
2873 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
00e2e675 | 2874 | /* |
2f77fc4b | 2875 | * Only list the sessions the user can control. |
00e2e675 | 2876 | */ |
2f77fc4b DG |
2877 | if (!session_access_ok(session, uid, gid)) { |
2878 | continue; | |
2879 | } | |
2880 | i++; | |
a4b92340 | 2881 | } |
2f77fc4b | 2882 | return i; |
00e2e675 DG |
2883 | } |
2884 | ||
54d01ffb DG |
2885 | /* |
2886 | * Process the command requested by the lttng client within the command | |
2887 | * context structure. This function make sure that the return structure (llm) | |
2888 | * is set and ready for transmission before returning. | |
2889 | * | |
2890 | * Return any error encountered or 0 for success. | |
53a80697 MD |
2891 | * |
2892 | * "sock" is only used for special-case var. len data. | |
36b588ed MD |
2893 | * |
2894 | * Should *NOT* be called with RCU read-side lock held. | |
54d01ffb | 2895 | */ |
53a80697 MD |
2896 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
2897 | int *sock_error) | |
54d01ffb | 2898 | { |
f73fabfd | 2899 | int ret = LTTNG_OK; |
44d3bd01 | 2900 | int need_tracing_session = 1; |
2e09ba09 | 2901 | int need_domain; |
54d01ffb DG |
2902 | |
2903 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
2904 | ||
53a80697 MD |
2905 | *sock_error = 0; |
2906 | ||
2e09ba09 MD |
2907 | switch (cmd_ctx->lsm->cmd_type) { |
2908 | case LTTNG_CREATE_SESSION: | |
27babd3a | 2909 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2910 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 MD |
2911 | case LTTNG_DESTROY_SESSION: |
2912 | case LTTNG_LIST_SESSIONS: | |
2913 | case LTTNG_LIST_DOMAINS: | |
2914 | case LTTNG_START_TRACE: | |
2915 | case LTTNG_STOP_TRACE: | |
6d805429 | 2916 | case LTTNG_DATA_PENDING: |
da3c9ec1 DG |
2917 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
2918 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
2919 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
2920 | case LTTNG_SNAPSHOT_RECORD: | |
fb198a11 | 2921 | case LTTNG_SAVE_SESSION: |
d7ba1388 | 2922 | case LTTNG_SET_SESSION_SHM_PATH: |
2e09ba09 | 2923 | need_domain = 0; |
3aace903 | 2924 | break; |
2e09ba09 MD |
2925 | default: |
2926 | need_domain = 1; | |
2927 | } | |
2928 | ||
2929 | if (opt_no_kernel && need_domain | |
2930 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
531d29f9 | 2931 | if (!is_root) { |
f73fabfd | 2932 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
531d29f9 | 2933 | } else { |
f73fabfd | 2934 | ret = LTTNG_ERR_KERN_NA; |
531d29f9 | 2935 | } |
4fba7219 DG |
2936 | goto error; |
2937 | } | |
2938 | ||
8d3113b2 DG |
2939 | /* Deny register consumer if we already have a spawned consumer. */ |
2940 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
2941 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
2942 | if (kconsumer_data.pid > 0) { | |
f73fabfd | 2943 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
fa317f24 | 2944 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
8d3113b2 DG |
2945 | goto error; |
2946 | } | |
2947 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
2948 | } | |
2949 | ||
54d01ffb DG |
2950 | /* |
2951 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 2952 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
2953 | * command. |
2954 | */ | |
2955 | switch(cmd_ctx->lsm->cmd_type) { | |
2956 | case LTTNG_LIST_SESSIONS: | |
2957 | case LTTNG_LIST_TRACEPOINTS: | |
f37d259d | 2958 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
54d01ffb DG |
2959 | case LTTNG_LIST_DOMAINS: |
2960 | case LTTNG_LIST_CHANNELS: | |
2961 | case LTTNG_LIST_EVENTS: | |
834978fd | 2962 | case LTTNG_LIST_SYSCALLS: |
a5dfbb9d | 2963 | case LTTNG_LIST_TRACKER_PIDS: |
54d01ffb DG |
2964 | break; |
2965 | default: | |
2966 | /* Setup lttng message with no payload */ | |
2967 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2968 | if (ret < 0) { | |
2969 | /* This label does not try to unlock the session */ | |
2970 | goto init_setup_error; | |
2971 | } | |
2972 | } | |
2973 | ||
2974 | /* Commands that DO NOT need a session. */ | |
2975 | switch (cmd_ctx->lsm->cmd_type) { | |
54d01ffb | 2976 | case LTTNG_CREATE_SESSION: |
27babd3a | 2977 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
ecc48a90 | 2978 | case LTTNG_CREATE_SESSION_LIVE: |
2e09ba09 | 2979 | case LTTNG_CALIBRATE: |
54d01ffb DG |
2980 | case LTTNG_LIST_SESSIONS: |
2981 | case LTTNG_LIST_TRACEPOINTS: | |
834978fd | 2982 | case LTTNG_LIST_SYSCALLS: |
f37d259d | 2983 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
fb198a11 | 2984 | case LTTNG_SAVE_SESSION: |
44d3bd01 | 2985 | need_tracing_session = 0; |
54d01ffb DG |
2986 | break; |
2987 | default: | |
2988 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
256a5576 MD |
2989 | /* |
2990 | * We keep the session list lock across _all_ commands | |
2991 | * for now, because the per-session lock does not | |
2992 | * handle teardown properly. | |
2993 | */ | |
74babd95 | 2994 | session_lock_list(); |
54d01ffb DG |
2995 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
2996 | if (cmd_ctx->session == NULL) { | |
bba2d65f | 2997 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
54d01ffb DG |
2998 | goto error; |
2999 | } else { | |
3000 | /* Acquire lock for the session */ | |
3001 | session_lock(cmd_ctx->session); | |
3002 | } | |
3003 | break; | |
3004 | } | |
b389abbe | 3005 | |
5f3ecf22 DG |
3006 | /* |
3007 | * Commands that need a valid session but should NOT create one if none | |
3008 | * exists. Instead of creating one and destroying it when the command is | |
3009 | * handled, process that right before so we save some round trip in useless | |
3010 | * code path. | |
3011 | */ | |
3012 | switch (cmd_ctx->lsm->cmd_type) { | |
3013 | case LTTNG_DISABLE_CHANNEL: | |
3014 | case LTTNG_DISABLE_EVENT: | |
5f3ecf22 DG |
3015 | switch (cmd_ctx->lsm->domain.type) { |
3016 | case LTTNG_DOMAIN_KERNEL: | |
3017 | if (!cmd_ctx->session->kernel_session) { | |
3018 | ret = LTTNG_ERR_NO_CHANNEL; | |
3019 | goto error; | |
3020 | } | |
3021 | break; | |
3022 | case LTTNG_DOMAIN_JUL: | |
5cdb6027 | 3023 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3024 | case LTTNG_DOMAIN_PYTHON: |
5f3ecf22 DG |
3025 | case LTTNG_DOMAIN_UST: |
3026 | if (!cmd_ctx->session->ust_session) { | |
3027 | ret = LTTNG_ERR_NO_CHANNEL; | |
3028 | goto error; | |
3029 | } | |
3030 | break; | |
3031 | default: | |
3032 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
3033 | goto error; | |
3034 | } | |
3035 | default: | |
3036 | break; | |
3037 | } | |
3038 | ||
2e09ba09 MD |
3039 | if (!need_domain) { |
3040 | goto skip_domain; | |
3041 | } | |
a4b92340 | 3042 | |
54d01ffb DG |
3043 | /* |
3044 | * Check domain type for specific "pre-action". | |
3045 | */ | |
3046 | switch (cmd_ctx->lsm->domain.type) { | |
3047 | case LTTNG_DOMAIN_KERNEL: | |
d1f1c568 | 3048 | if (!is_root) { |
f73fabfd | 3049 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
d1f1c568 DG |
3050 | goto error; |
3051 | } | |
3052 | ||
54d01ffb | 3053 | /* Kernel tracer check */ |
a4b35e07 | 3054 | if (kernel_tracer_fd == -1) { |
54d01ffb | 3055 | /* Basically, load kernel tracer modules */ |
096102bd DG |
3056 | ret = init_kernel_tracer(); |
3057 | if (ret != 0) { | |
54d01ffb DG |
3058 | goto error; |
3059 | } | |
3060 | } | |
5eb91c98 | 3061 | |
5c827ce0 DG |
3062 | /* Consumer is in an ERROR state. Report back to client */ |
3063 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3064 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3065 | goto error; |
3066 | } | |
3067 | ||
54d01ffb | 3068 | /* Need a session for kernel command */ |
44d3bd01 | 3069 | if (need_tracing_session) { |
54d01ffb | 3070 | if (cmd_ctx->session->kernel_session == NULL) { |
6df2e2c9 | 3071 | ret = create_kernel_session(cmd_ctx->session); |
5eb91c98 | 3072 | if (ret < 0) { |
f73fabfd | 3073 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
5eb91c98 DG |
3074 | goto error; |
3075 | } | |
b389abbe | 3076 | } |
7d29a247 | 3077 | |
54d01ffb | 3078 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3079 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3080 | if (kconsumer_data.pid == 0 && | |
785d2d0d | 3081 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3082 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3083 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3084 | if (ret < 0) { |
f73fabfd | 3085 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
54d01ffb | 3086 | goto error; |
950131af | 3087 | } |
5c827ce0 | 3088 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
3ff2ecac MD |
3089 | } else { |
3090 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3091 | } |
173af62f | 3092 | |
a4b92340 DG |
3093 | /* |
3094 | * The consumer was just spawned so we need to add the socket to | |
3095 | * the consumer output of the session if exist. | |
3096 | */ | |
3097 | ret = consumer_create_socket(&kconsumer_data, | |
3098 | cmd_ctx->session->kernel_session->consumer); | |
3099 | if (ret < 0) { | |
3100 | goto error; | |
173af62f | 3101 | } |
0d0c377a | 3102 | } |
5c827ce0 | 3103 | |
54d01ffb | 3104 | break; |
b9dfb167 | 3105 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3106 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3107 | case LTTNG_DOMAIN_PYTHON: |
2bdd86d4 | 3108 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3109 | { |
b51ec5b4 MD |
3110 | if (!ust_app_supported()) { |
3111 | ret = LTTNG_ERR_NO_UST; | |
3112 | goto error; | |
3113 | } | |
5c827ce0 DG |
3114 | /* Consumer is in an ERROR state. Report back to client */ |
3115 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
f73fabfd | 3116 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3117 | goto error; |
3118 | } | |
3119 | ||
44d3bd01 | 3120 | if (need_tracing_session) { |
a4b92340 | 3121 | /* Create UST session if none exist. */ |
f6a9efaa | 3122 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3123 | ret = create_ust_session(cmd_ctx->session, |
6df2e2c9 | 3124 | &cmd_ctx->lsm->domain); |
f73fabfd | 3125 | if (ret != LTTNG_OK) { |
44d3bd01 DG |
3126 | goto error; |
3127 | } | |
3128 | } | |
00e2e675 | 3129 | |
7753dea8 MD |
3130 | /* Start the UST consumer daemons */ |
3131 | /* 64-bit */ | |
3132 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3133 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3134 | ustconsumer64_data.pid == 0 && |
785d2d0d | 3135 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3136 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3137 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3138 | if (ret < 0) { |
f73fabfd | 3139 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
173af62f | 3140 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
2bdd86d4 MD |
3141 | goto error; |
3142 | } | |
48842b30 | 3143 | |
173af62f | 3144 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
5c827ce0 | 3145 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
3ff2ecac | 3146 | } else { |
7753dea8 MD |
3147 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3148 | } | |
173af62f DG |
3149 | |
3150 | /* | |
3151 | * Setup socket for consumer 64 bit. No need for atomic access | |
3152 | * since it was set above and can ONLY be set in this thread. | |
3153 | */ | |
a4b92340 DG |
3154 | ret = consumer_create_socket(&ustconsumer64_data, |
3155 | cmd_ctx->session->ust_session->consumer); | |
3156 | if (ret < 0) { | |
3157 | goto error; | |
173af62f DG |
3158 | } |
3159 | ||
7753dea8 | 3160 | /* 32-bit */ |
385b881b | 3161 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
fc7a59ce | 3162 | if (consumerd32_bin[0] != '\0' && |
7753dea8 | 3163 | ustconsumer32_data.pid == 0 && |
785d2d0d | 3164 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3165 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
3166 | ret = start_consumerd(&ustconsumer32_data); | |
3167 | if (ret < 0) { | |
f73fabfd | 3168 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
173af62f | 3169 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
7753dea8 MD |
3170 | goto error; |
3171 | } | |
5c827ce0 | 3172 | |
173af62f | 3173 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
5c827ce0 | 3174 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
7753dea8 MD |
3175 | } else { |
3176 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3177 | } |
173af62f DG |
3178 | |
3179 | /* | |
3180 | * Setup socket for consumer 64 bit. No need for atomic access | |
3181 | * since it was set above and can ONLY be set in this thread. | |
3182 | */ | |
a4b92340 DG |
3183 | ret = consumer_create_socket(&ustconsumer32_data, |
3184 | cmd_ctx->session->ust_session->consumer); | |
3185 | if (ret < 0) { | |
3186 | goto error; | |
173af62f | 3187 | } |
44d3bd01 DG |
3188 | } |
3189 | break; | |
48842b30 | 3190 | } |
54d01ffb | 3191 | default: |
54d01ffb DG |
3192 | break; |
3193 | } | |
2e09ba09 | 3194 | skip_domain: |
33a2b854 | 3195 | |
5c827ce0 DG |
3196 | /* Validate consumer daemon state when start/stop trace command */ |
3197 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
3198 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
3199 | switch (cmd_ctx->lsm->domain.type) { | |
b9dfb167 | 3200 | case LTTNG_DOMAIN_JUL: |
5cdb6027 | 3201 | case LTTNG_DOMAIN_LOG4J: |
0e115563 | 3202 | case LTTNG_DOMAIN_PYTHON: |
5c827ce0 DG |
3203 | case LTTNG_DOMAIN_UST: |
3204 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3205 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
5c827ce0 DG |
3206 | goto error; |
3207 | } | |
3208 | break; | |
3209 | case LTTNG_DOMAIN_KERNEL: | |
3210 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
f73fabfd | 3211 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
5c827ce0 DG |
3212 | goto error; |
3213 | } | |
3214 | break; | |
3215 | } | |
3216 | } | |
3217 | ||
8e0af1b4 MD |
3218 | /* |
3219 | * Check that the UID or GID match that of the tracing session. | |
3220 | * The root user can interact with all sessions. | |
3221 | */ | |
3222 | if (need_tracing_session) { | |
3223 | if (!session_access_ok(cmd_ctx->session, | |
730389d9 DG |
3224 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3225 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) { | |
f73fabfd | 3226 | ret = LTTNG_ERR_EPERM; |
8e0af1b4 MD |
3227 | goto error; |
3228 | } | |
3229 | } | |
3230 | ||
ffe60014 DG |
3231 | /* |
3232 | * Send relayd information to consumer as soon as we have a domain and a | |
3233 | * session defined. | |
3234 | */ | |
3235 | if (cmd_ctx->session && need_domain) { | |
3236 | /* | |
3237 | * Setup relayd if not done yet. If the relayd information was already | |
3238 | * sent to the consumer, this call will gracefully return. | |
3239 | */ | |
3240 | ret = cmd_setup_relayd(cmd_ctx->session); | |
3241 | if (ret != LTTNG_OK) { | |
3242 | goto error; | |
3243 | } | |
3244 | } | |
3245 | ||
54d01ffb DG |
3246 | /* Process by command type */ |
3247 | switch (cmd_ctx->lsm->cmd_type) { | |
3248 | case LTTNG_ADD_CONTEXT: | |
3249 | { | |
3250 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3251 | cmd_ctx->lsm->u.context.channel_name, | |
979e618e | 3252 | &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]); |
54d01ffb DG |
3253 | break; |
3254 | } | |
3255 | case LTTNG_DISABLE_CHANNEL: | |
3256 | { | |
3257 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3258 | cmd_ctx->lsm->u.disable.channel_name); | |
3259 | break; | |
3260 | } | |
3261 | case LTTNG_DISABLE_EVENT: | |
3262 | { | |
6e911cad MD |
3263 | /* FIXME: passing packed structure to non-packed pointer */ |
3264 | /* TODO: handle filter */ | |
54d01ffb DG |
3265 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3266 | cmd_ctx->lsm->u.disable.channel_name, | |
6e911cad | 3267 | &cmd_ctx->lsm->u.disable.event); |
33a2b854 DG |
3268 | break; |
3269 | } | |
54d01ffb DG |
3270 | case LTTNG_ENABLE_CHANNEL: |
3271 | { | |
7972aab2 | 3272 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
2f77fc4b | 3273 | &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]); |
54d01ffb DG |
3274 | break; |
3275 | } | |
ccf10263 MD |
3276 | case LTTNG_TRACK_PID: |
3277 | { | |
3278 | ret = cmd_track_pid(cmd_ctx->session, | |
3279 | cmd_ctx->lsm->domain.type, | |
3280 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3281 | break; | |
3282 | } | |
3283 | case LTTNG_UNTRACK_PID: | |
3284 | { | |
3285 | ret = cmd_untrack_pid(cmd_ctx->session, | |
3286 | cmd_ctx->lsm->domain.type, | |
3287 | cmd_ctx->lsm->u.pid_tracker.pid); | |
3288 | break; | |
3289 | } | |
54d01ffb DG |
3290 | case LTTNG_ENABLE_EVENT: |
3291 | { | |
882ef835 JI |
3292 | struct lttng_event_exclusion *exclusion = NULL; |
3293 | struct lttng_filter_bytecode *bytecode = NULL; | |
6b453b5e | 3294 | char *filter_expression = NULL; |
882ef835 | 3295 | |
67676bd8 DG |
3296 | /* Handle exclusion events and receive it from the client. */ |
3297 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
3298 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
3299 | ||
3300 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
3301 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
3302 | if (!exclusion) { | |
3303 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
3304 | goto error; | |
882ef835 | 3305 | } |
882ef835 | 3306 | |
67676bd8 DG |
3307 | DBG("Receiving var len exclusion event list from client ..."); |
3308 | exclusion->count = count; | |
3309 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, | |
3310 | count * LTTNG_SYMBOL_NAME_LEN); | |
3311 | if (ret <= 0) { | |
3312 | DBG("Nothing recv() from client var len data... continuing"); | |
3313 | *sock_error = 1; | |
3314 | free(exclusion); | |
3315 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
3316 | goto error; | |
3317 | } | |
3318 | } | |
3319 | ||
6b453b5e JG |
3320 | /* Get filter expression from client. */ |
3321 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
3322 | size_t expression_len = | |
3323 | cmd_ctx->lsm->u.enable.expression_len; | |
3324 | ||
3325 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
3326 | ret = LTTNG_ERR_FILTER_INVAL; | |
3327 | free(exclusion); | |
3328 | goto error; | |
3329 | } | |
3330 | ||
3331 | filter_expression = zmalloc(expression_len); | |
3332 | if (!filter_expression) { | |
3333 | free(exclusion); | |
3334 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3335 | goto error; | |
3336 | } | |
3337 | ||
3338 | /* Receive var. len. data */ | |
3339 | DBG("Receiving var len filter's expression from client ..."); | |
3340 | ret = lttcomm_recv_unix_sock(sock, filter_expression, | |
3341 | expression_len); | |
3342 | if (ret <= 0) { | |
3343 | DBG("Nothing recv() from client car len data... continuing"); | |
3344 | *sock_error = 1; | |
3345 | free(filter_expression); | |
3346 | free(exclusion); | |
3347 | ret = LTTNG_ERR_FILTER_INVAL; | |
3348 | goto error; | |
3349 | } | |
3350 | } | |
3351 | ||
67676bd8 DG |
3352 | /* Handle filter and get bytecode from client. */ |
3353 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
3354 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
3355 | ||
3356 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
3357 | ret = LTTNG_ERR_FILTER_INVAL; | |
49d21f93 | 3358 | free(filter_expression); |
67676bd8 DG |
3359 | free(exclusion); |
3360 | goto error; | |
3361 | } | |
3362 | ||
3363 | bytecode = zmalloc(bytecode_len); | |
3364 | if (!bytecode) { | |
49d21f93 | 3365 | free(filter_expression); |
67676bd8 DG |
3366 | free(exclusion); |
3367 | ret = LTTNG_ERR_FILTER_NOMEM; | |
3368 | goto error; | |
882ef835 JI |
3369 | } |
3370 | ||
67676bd8 DG |
3371 | /* Receive var. len. data */ |
3372 | DBG("Receiving var len filter's bytecode from client ..."); | |
3373 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); | |
3374 | if (ret <= 0) { | |
3375 | DBG("Nothing recv() from client car len data... continuing"); | |
3376 | *sock_error = 1; | |
49d21f93 | 3377 | free(filter_expression); |
67676bd8 DG |
3378 | free(bytecode); |
3379 | free(exclusion); | |
3380 | ret = LTTNG_ERR_FILTER_INVAL; | |
3381 | goto error; | |
3382 | } | |
3383 | ||
3384 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
49d21f93 | 3385 | free(filter_expression); |
67676bd8 DG |
3386 | free(bytecode); |
3387 | free(exclusion); | |
3388 | ret = LTTNG_ERR_FILTER_INVAL; | |
3389 | goto error; | |
3390 | } | |
882ef835 | 3391 | } |
67676bd8 DG |
3392 | |
3393 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, | |
3394 | cmd_ctx->lsm->u.enable.channel_name, | |
6b453b5e JG |
3395 | &cmd_ctx->lsm->u.enable.event, |
3396 | filter_expression, bytecode, exclusion, | |
67676bd8 | 3397 | kernel_poll_pipe[1]); |
54d01ffb DG |
3398 | break; |
3399 | } | |
052da939 | 3400 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3401 | { |
9f19cc17 | 3402 | struct lttng_event *events; |
54d01ffb | 3403 | ssize_t nb_events; |
052da939 | 3404 | |
0845bbfa | 3405 | session_lock_list(); |
54d01ffb | 3406 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
0845bbfa | 3407 | session_unlock_list(); |
54d01ffb | 3408 | if (nb_events < 0) { |
f73fabfd | 3409 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3410 | ret = -nb_events; |
3411 | goto error; | |
2ef84c95 DG |
3412 | } |
3413 | ||
3414 | /* | |
3415 | * Setup lttng message with payload size set to the event list size in | |
3416 | * bytes and then copy list into the llm payload. | |
3417 | */ | |
052da939 | 3418 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3419 | if (ret < 0) { |
052da939 | 3420 | free(events); |
2ef84c95 DG |
3421 | goto setup_error; |
3422 | } | |
3423 | ||
3424 | /* Copy event list into message payload */ | |
9f19cc17 | 3425 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3426 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3427 | |
9f19cc17 | 3428 | free(events); |
2ef84c95 | 3429 | |
f73fabfd | 3430 | ret = LTTNG_OK; |
2ef84c95 DG |
3431 | break; |
3432 | } | |
f37d259d MD |
3433 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
3434 | { | |
3435 | struct lttng_event_field *fields; | |
3436 | ssize_t nb_fields; | |
3437 | ||
0845bbfa | 3438 | session_lock_list(); |
a4b92340 DG |
3439 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
3440 | &fields); | |
0845bbfa | 3441 | session_unlock_list(); |
f37d259d | 3442 | if (nb_fields < 0) { |
f73fabfd | 3443 | /* Return value is a negative lttng_error_code. */ |
f37d259d MD |
3444 | ret = -nb_fields; |
3445 | goto error; | |
3446 | } | |
3447 | ||
3448 | /* | |
3449 | * Setup lttng message with payload size set to the event list size in | |
3450 | * bytes and then copy list into the llm payload. | |
3451 | */ | |
a4b92340 DG |
3452 | ret = setup_lttng_msg(cmd_ctx, |
3453 | sizeof(struct lttng_event_field) * nb_fields); | |
f37d259d MD |
3454 | if (ret < 0) { |
3455 | free(fields); | |
3456 | goto setup_error; | |
3457 | } | |
3458 | ||
3459 | /* Copy event list into message payload */ | |
3460 | memcpy(cmd_ctx->llm->payload, fields, | |
3461 | sizeof(struct lttng_event_field) * nb_fields); | |
3462 | ||
3463 | free(fields); | |
3464 | ||
f73fabfd | 3465 | ret = LTTNG_OK; |
f37d259d MD |
3466 | break; |
3467 | } | |
834978fd DG |
3468 | case LTTNG_LIST_SYSCALLS: |
3469 | { | |
3470 | struct lttng_event *events; | |
3471 | ssize_t nb_events; | |
3472 | ||
3473 | nb_events = cmd_list_syscalls(&events); | |
3474 | if (nb_events < 0) { | |
3475 | /* Return value is a negative lttng_error_code. */ | |
3476 | ret = -nb_events; | |
3477 | goto error; | |
3478 | } | |
3479 | ||
3480 | /* | |
3481 | * Setup lttng message with payload size set to the event list size in | |
3482 | * bytes and then copy list into the llm payload. | |
3483 | */ | |
3484 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); | |
3485 | if (ret < 0) { | |
3486 | free(events); | |
3487 | goto setup_error; | |
3488 | } | |
3489 | ||
3490 | /* Copy event list into message payload */ | |
3491 | memcpy(cmd_ctx->llm->payload, events, | |
3492 | sizeof(struct lttng_event) * nb_events); | |
3493 | ||
3494 | free(events); | |
3495 | ||
3496 | ret = LTTNG_OK; | |
3497 | break; | |
3498 | } | |
a5dfbb9d MD |
3499 | case LTTNG_LIST_TRACKER_PIDS: |
3500 | { | |
3501 | int32_t *pids = NULL; | |
3502 | ssize_t nr_pids; | |
3503 | ||
3504 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
3505 | cmd_ctx->lsm->domain.type, &pids); | |
3506 | if (nr_pids < 0) { | |
3507 | /* Return value is a negative lttng_error_code. */ | |
3508 | ret = -nr_pids; | |
3509 | goto error; | |
3510 | } | |
3511 | ||
3512 | /* | |
3513 | * Setup lttng message with payload size set to the event list size in | |
3514 | * bytes and then copy list into the llm payload. | |
3515 | */ | |
3516 | ret = setup_lttng_msg(cmd_ctx, sizeof(int32_t) * nr_pids); | |
3517 | if (ret < 0) { | |
3518 | free(pids); | |
3519 | goto setup_error; | |
3520 | } | |
3521 | ||
3522 | /* Copy event list into message payload */ | |
3523 | memcpy(cmd_ctx->llm->payload, pids, | |
3524 | sizeof(int) * nr_pids); | |
3525 | ||
3526 | free(pids); | |
3527 | ||
3528 | ret = LTTNG_OK; | |
3529 | break; | |
3530 | } | |
00e2e675 DG |
3531 | case LTTNG_SET_CONSUMER_URI: |
3532 | { | |
a4b92340 DG |
3533 | size_t nb_uri, len; |
3534 | struct lttng_uri *uris; | |
3535 | ||
3536 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3537 | len = nb_uri * sizeof(struct lttng_uri); | |
3538 | ||
3539 | if (nb_uri == 0) { | |
f73fabfd | 3540 | ret = LTTNG_ERR_INVALID; |
a4b92340 DG |
3541 | goto error; |
3542 | } | |
3543 | ||
3544 | uris = zmalloc(len); | |
3545 | if (uris == NULL) { | |
f73fabfd | 3546 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3547 | goto error; |
3548 | } | |
3549 | ||
3550 | /* Receive variable len data */ | |
77c7c900 | 3551 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
a4b92340 DG |
3552 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3553 | if (ret <= 0) { | |
3554 | DBG("No URIs received from client... continuing"); | |
3555 | *sock_error = 1; | |
f73fabfd | 3556 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3557 | free(uris); |
a4b92340 DG |
3558 | goto error; |
3559 | } | |
3560 | ||
bda32d56 JG |
3561 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
3562 | free(uris); | |
f73fabfd | 3563 | if (ret != LTTNG_OK) { |
a4b92340 DG |
3564 | goto error; |
3565 | } | |
3566 | ||
b1d41407 | 3567 | |
00e2e675 DG |
3568 | break; |
3569 | } | |
f3ed775e | 3570 | case LTTNG_START_TRACE: |
8c0faa1d | 3571 | { |
54d01ffb | 3572 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3573 | break; |
3574 | } | |
f3ed775e | 3575 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3576 | { |
54d01ffb | 3577 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3578 | break; |
3579 | } | |
5e16da05 MD |
3580 | case LTTNG_CREATE_SESSION: |
3581 | { | |
a4b92340 DG |
3582 | size_t nb_uri, len; |
3583 | struct lttng_uri *uris = NULL; | |
3584 | ||
3585 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3586 | len = nb_uri * sizeof(struct lttng_uri); | |
3587 | ||
3588 | if (nb_uri > 0) { | |
3589 | uris = zmalloc(len); | |
3590 | if (uris == NULL) { | |
f73fabfd | 3591 | ret = LTTNG_ERR_FATAL; |
a4b92340 DG |
3592 | goto error; |
3593 | } | |
3594 | ||
3595 | /* Receive variable len data */ | |
77c7c900 | 3596 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
a4b92340 DG |
3597 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
3598 | if (ret <= 0) { | |
3599 | DBG("No URIs received from client... continuing"); | |
3600 | *sock_error = 1; | |
f73fabfd | 3601 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3602 | free(uris); |
a4b92340 DG |
3603 | goto error; |
3604 | } | |
3605 | ||
3606 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3607 | DBG("Creating session with ONE network URI is a bad call"); | |
f73fabfd | 3608 | ret = LTTNG_ERR_SESSION_FAIL; |
b1d41407 | 3609 | free(uris); |
a4b92340 DG |
3610 | goto error; |
3611 | } | |
3612 | } | |
3613 | ||
3614 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, | |
ecc48a90 | 3615 | &cmd_ctx->creds, 0); |
a4b92340 | 3616 | |
b1d41407 DG |
3617 | free(uris); |
3618 | ||
00e2e675 DG |
3619 | break; |
3620 | } | |
5e16da05 MD |
3621 | case LTTNG_DESTROY_SESSION: |
3622 | { | |
2f77fc4b | 3623 | ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]); |
a4b92340 DG |
3624 | |
3625 | /* Set session to NULL so we do not unlock it after free. */ | |
256a5576 | 3626 | cmd_ctx->session = NULL; |
5461b305 | 3627 | break; |
5e16da05 | 3628 | } |
9f19cc17 | 3629 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3630 | { |
54d01ffb | 3631 | ssize_t nb_dom; |
fa64dfb4 | 3632 | struct lttng_domain *domains = NULL; |
5461b305 | 3633 | |
54d01ffb DG |
3634 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3635 | if (nb_dom < 0) { | |
f73fabfd | 3636 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3637 | ret = -nb_dom; |
3638 | goto error; | |
ce3d728c | 3639 | } |
520ff687 | 3640 | |
54d01ffb | 3641 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 | 3642 | if (ret < 0) { |
ae9c20bc | 3643 | free(domains); |
5461b305 | 3644 | goto setup_error; |
520ff687 | 3645 | } |
57167058 | 3646 | |
54d01ffb DG |
3647 | /* Copy event list into message payload */ |
3648 | memcpy(cmd_ctx->llm->payload, domains, | |
3649 | nb_dom * sizeof(struct lttng_domain)); | |
3650 | ||
3651 | free(domains); | |
5e16da05 | 3652 | |
f73fabfd | 3653 | ret = LTTNG_OK; |
5e16da05 MD |
3654 | break; |
3655 | } | |
9f19cc17 | 3656 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3657 | { |
6775595e | 3658 | int nb_chan; |
ade7ce52 | 3659 | struct lttng_channel *channels = NULL; |
54d01ffb | 3660 | |
b551a063 DG |
3661 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3662 | cmd_ctx->session, &channels); | |
54d01ffb | 3663 | if (nb_chan < 0) { |
f73fabfd | 3664 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3665 | ret = -nb_chan; |
3666 | goto error; | |
5461b305 | 3667 | } |
ca95a216 | 3668 | |
54d01ffb | 3669 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 | 3670 | if (ret < 0) { |
ae9c20bc | 3671 | free(channels); |
5461b305 DG |
3672 | goto setup_error; |
3673 | } | |
9f19cc17 | 3674 | |
54d01ffb DG |
3675 | /* Copy event list into message payload */ |
3676 | memcpy(cmd_ctx->llm->payload, channels, | |
3677 | nb_chan * sizeof(struct lttng_channel)); | |
3678 | ||
3679 | free(channels); | |
9f19cc17 | 3680 | |
f73fabfd | 3681 | ret = LTTNG_OK; |
5461b305 | 3682 | break; |
5e16da05 | 3683 | } |
9f19cc17 | 3684 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3685 | { |
b551a063 | 3686 | ssize_t nb_event; |
684d34d2 | 3687 | struct lttng_event *events = NULL; |
9f19cc17 | 3688 | |
b551a063 | 3689 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3690 | cmd_ctx->lsm->u.list.channel_name, &events); |
3691 | if (nb_event < 0) { | |
f73fabfd | 3692 | /* Return value is a negative lttng_error_code. */ |
54d01ffb DG |
3693 | ret = -nb_event; |
3694 | goto error; | |
5461b305 | 3695 | } |
ca95a216 | 3696 | |
54d01ffb | 3697 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 | 3698 | if (ret < 0) { |
ae9c20bc | 3699 | free(events); |
5461b305 DG |
3700 | goto setup_error; |
3701 | } | |
9f19cc17 | 3702 | |
54d01ffb DG |
3703 | /* Copy event list into message payload */ |
3704 | memcpy(cmd_ctx->llm->payload, events, | |
3705 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3706 | |
54d01ffb | 3707 | free(events); |
9f19cc17 | 3708 | |
f73fabfd | 3709 | ret = LTTNG_OK; |
5461b305 | 3710 | break; |
5e16da05 MD |
3711 | } |
3712 | case LTTNG_LIST_SESSIONS: | |
3713 | { | |
8e0af1b4 | 3714 | unsigned int nr_sessions; |
5461b305 | 3715 | |
8e0af1b4 | 3716 | session_lock_list(); |
730389d9 DG |
3717 | nr_sessions = lttng_sessions_count( |
3718 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
3719 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
d32fb093 | 3720 | |
8e0af1b4 | 3721 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions); |
5461b305 | 3722 | if (ret < 0) { |
54d01ffb | 3723 | session_unlock_list(); |
5461b305 | 3724 | goto setup_error; |
e065084a | 3725 | } |
5e16da05 | 3726 | |
6c9cc2ab | 3727 | /* Filled the session array */ |
2f77fc4b | 3728 | cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload), |
730389d9 DG |
3729 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
3730 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
6c9cc2ab | 3731 | |
54d01ffb | 3732 | session_unlock_list(); |
5e16da05 | 3733 | |
f73fabfd | 3734 | ret = LTTNG_OK; |
5e16da05 MD |
3735 | break; |
3736 | } | |
d0254c7c MD |
3737 | case LTTNG_CALIBRATE: |
3738 | { | |
54d01ffb DG |
3739 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3740 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3741 | break; |
3742 | } | |
d9800920 DG |
3743 | case LTTNG_REGISTER_CONSUMER: |
3744 | { | |
2f77fc4b DG |
3745 | struct consumer_data *cdata; |
3746 | ||
3747 | switch (cmd_ctx->lsm->domain.type) { | |
3748 | case LTTNG_DOMAIN_KERNEL: | |
3749 | cdata = &kconsumer_data; | |
3750 | break; | |
3751 | default: | |
f73fabfd | 3752 | ret = LTTNG_ERR_UND; |
2f77fc4b DG |
3753 | goto error; |
3754 | } | |
3755 | ||
54d01ffb | 3756 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
2f77fc4b | 3757 | cmd_ctx->lsm->u.reg.path, cdata); |
d9800920 DG |
3758 | break; |
3759 | } | |
6d805429 | 3760 | case LTTNG_DATA_PENDING: |
806e2684 | 3761 | { |
6d805429 | 3762 | ret = cmd_data_pending(cmd_ctx->session); |
806e2684 DG |
3763 | break; |
3764 | } | |
da3c9ec1 DG |
3765 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
3766 | { | |
6dc3064a DG |
3767 | struct lttcomm_lttng_output_id reply; |
3768 | ||
3769 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
3770 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); | |
3771 | if (ret != LTTNG_OK) { | |
3772 | goto error; | |
3773 | } | |
3774 | ||
3775 | ret = setup_lttng_msg(cmd_ctx, sizeof(reply)); | |
3776 | if (ret < 0) { | |
3777 | goto setup_error; | |
3778 | } | |
3779 | ||
3780 | /* Copy output list into message payload */ | |
3781 | memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply)); | |
3782 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3783 | break; |
3784 | } | |
3785 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
3786 | { | |
6dc3064a DG |
3787 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
3788 | &cmd_ctx->lsm->u.snapshot_output.output); | |
da3c9ec1 DG |
3789 | break; |
3790 | } | |
3791 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
3792 | { | |
6dc3064a DG |
3793 | ssize_t nb_output; |
3794 | struct lttng_snapshot_output *outputs = NULL; | |
3795 | ||
3796 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
3797 | if (nb_output < 0) { | |
3798 | ret = -nb_output; | |
3799 | goto error; | |
3800 | } | |
3801 | ||
3802 | ret = setup_lttng_msg(cmd_ctx, | |
3803 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3804 | if (ret < 0) { | |
3805 | free(outputs); | |
3806 | goto setup_error; | |
3807 | } | |
3808 | ||
3809 | if (outputs) { | |
3810 | /* Copy output list into message payload */ | |
3811 | memcpy(cmd_ctx->llm->payload, outputs, | |
3812 | nb_output * sizeof(struct lttng_snapshot_output)); | |
3813 | free(outputs); | |
3814 | } | |
3815 | ||
3816 | ret = LTTNG_OK; | |
da3c9ec1 DG |
3817 | break; |
3818 | } | |
3819 | case LTTNG_SNAPSHOT_RECORD: | |
3820 | { | |
6dc3064a DG |
3821 | ret = cmd_snapshot_record(cmd_ctx->session, |
3822 | &cmd_ctx->lsm->u.snapshot_record.output, | |
3823 | cmd_ctx->lsm->u.snapshot_record.wait); | |
da3c9ec1 DG |
3824 | break; |
3825 | } | |
27babd3a DG |
3826 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
3827 | { | |
3828 | size_t nb_uri, len; | |
3829 | struct lttng_uri *uris = NULL; | |
3830 | ||
3831 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3832 | len = nb_uri * sizeof(struct lttng_uri); | |
3833 | ||
3834 | if (nb_uri > 0) { | |
3835 | uris = zmalloc(len); | |
3836 | if (uris == NULL) { | |
3837 | ret = LTTNG_ERR_FATAL; | |
3838 | goto error; | |
3839 | } | |
3840 | ||
3841 | /* Receive variable len data */ | |
3842 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3843 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3844 | if (ret <= 0) { | |
3845 | DBG("No URIs received from client... continuing"); | |
3846 | *sock_error = 1; | |
3847 | ret = LTTNG_ERR_SESSION_FAIL; | |
3848 | free(uris); | |
3849 | goto error; | |
3850 | } | |
3851 | ||
3852 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3853 | DBG("Creating session with ONE network URI is a bad call"); | |
3854 | ret = LTTNG_ERR_SESSION_FAIL; | |
3855 | free(uris); | |
3856 | goto error; | |
3857 | } | |
3858 | } | |
3859 | ||
3860 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, | |
3861 | nb_uri, &cmd_ctx->creds); | |
3862 | free(uris); | |
3863 | break; | |
3864 | } | |
ecc48a90 JD |
3865 | case LTTNG_CREATE_SESSION_LIVE: |
3866 | { | |
3867 | size_t nb_uri, len; | |
3868 | struct lttng_uri *uris = NULL; | |
3869 | ||
3870 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
3871 | len = nb_uri * sizeof(struct lttng_uri); | |
3872 | ||
3873 | if (nb_uri > 0) { | |
3874 | uris = zmalloc(len); | |
3875 | if (uris == NULL) { | |
3876 | ret = LTTNG_ERR_FATAL; | |
3877 | goto error; | |
3878 | } | |
3879 | ||
3880 | /* Receive variable len data */ | |
3881 | DBG("Waiting for %zu URIs from client ...", nb_uri); | |
3882 | ret = lttcomm_recv_unix_sock(sock, uris, len); | |
3883 | if (ret <= 0) { | |
3884 | DBG("No URIs received from client... continuing"); | |
3885 | *sock_error = 1; | |
3886 | ret = LTTNG_ERR_SESSION_FAIL; | |
3887 | free(uris); | |
3888 | goto error; | |
3889 | } | |
3890 | ||
3891 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { | |
3892 | DBG("Creating session with ONE network URI is a bad call"); | |
3893 | ret = LTTNG_ERR_SESSION_FAIL; | |
3894 | free(uris); | |
3895 | goto error; | |
3896 | } | |
3897 | } | |
3898 | ||
3899 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, | |
3900 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); | |
3901 | free(uris); | |
3902 | break; | |
3903 | } | |
fb198a11 JG |
3904 | case LTTNG_SAVE_SESSION: |
3905 | { | |
3906 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
3907 | &cmd_ctx->creds); | |
3908 | break; | |
3909 | } | |
d7ba1388 MD |
3910 | case LTTNG_SET_SESSION_SHM_PATH: |
3911 | { | |
3912 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
3913 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
3914 | break; | |
3915 | } | |
5e16da05 | 3916 | default: |
f73fabfd | 3917 | ret = LTTNG_ERR_UND; |
5461b305 | 3918 | break; |
fac6795d DG |
3919 | } |
3920 | ||
5461b305 | 3921 | error: |
5461b305 DG |
3922 | if (cmd_ctx->llm == NULL) { |
3923 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3924 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3925 | goto setup_error; |
3926 | } | |
3927 | } | |
54d01ffb | 3928 | /* Set return code */ |
5461b305 | 3929 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3930 | setup_error: |
b5541356 | 3931 | if (cmd_ctx->session) { |
54d01ffb | 3932 | session_unlock(cmd_ctx->session); |
b5541356 | 3933 | } |
256a5576 MD |
3934 | if (need_tracing_session) { |
3935 | session_unlock_list(); | |
3936 | } | |
54d01ffb | 3937 | init_setup_error: |
8028d920 | 3938 | return ret; |
fac6795d DG |
3939 | } |
3940 | ||
44a5e5eb DG |
3941 | /* |
3942 | * Thread managing health check socket. | |
3943 | */ | |
3944 | static void *thread_manage_health(void *data) | |
3945 | { | |
eb4a2943 | 3946 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
44a5e5eb DG |
3947 | uint32_t revents, nb_fd; |
3948 | struct lttng_poll_event events; | |
0c89d795 MD |
3949 | struct health_comm_msg msg; |
3950 | struct health_comm_reply reply; | |
44a5e5eb DG |
3951 | |
3952 | DBG("[thread] Manage health check started"); | |
3953 | ||
3954 | rcu_register_thread(); | |
3955 | ||
6d737ce4 DG |
3956 | /* We might hit an error path before this is created. */ |
3957 | lttng_poll_init(&events); | |
3cc04881 | 3958 | |
44a5e5eb DG |
3959 | /* Create unix socket */ |
3960 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
3961 | if (sock < 0) { | |
3962 | ERR("Unable to create health check Unix socket"); | |
3963 | ret = -1; | |
3964 | goto error; | |
3965 | } | |
3966 | ||
6c71277b MD |
3967 | if (is_root) { |
3968 | /* lttng health client socket path permissions */ | |
3969 | ret = chown(health_unix_sock_path, 0, | |
3970 | utils_get_group_id(tracing_group_name)); | |
3971 | if (ret < 0) { | |
3972 | ERR("Unable to set group on %s", health_unix_sock_path); | |
3973 | PERROR("chown"); | |
3974 | ret = -1; | |
3975 | goto error; | |
3976 | } | |
3977 | ||
3978 | ret = chmod(health_unix_sock_path, | |
3979 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3980 | if (ret < 0) { | |
3981 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
3982 | PERROR("chmod"); | |
3983 | ret = -1; | |
3984 | goto error; | |
3985 | } | |
3986 | } | |
3987 | ||
b662582b DG |
3988 | /* |
3989 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
3990 | * show must go on. | |
3991 | */ | |
3992 | (void) utils_set_fd_cloexec(sock); | |
3993 | ||
44a5e5eb DG |
3994 | ret = lttcomm_listen_unix_sock(sock); |
3995 | if (ret < 0) { | |
3996 | goto error; | |
3997 | } | |
3998 | ||
3999 | /* | |
4000 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4001 | * more will be added to this poll set. | |
4002 | */ | |
d0b96690 | 4003 | ret = sessiond_set_thread_pollset(&events, 2); |
44a5e5eb DG |
4004 | if (ret < 0) { |
4005 | goto error; | |
4006 | } | |
4007 | ||
4008 | /* Add the application registration socket */ | |
4009 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
4010 | if (ret < 0) { | |
4011 | goto error; | |
4012 | } | |
4013 | ||
ef367a93 | 4014 | sessiond_notify_ready(); |
97bc1426 | 4015 | |
44a5e5eb DG |
4016 | while (1) { |
4017 | DBG("Health check ready"); | |
4018 | ||
44a5e5eb DG |
4019 | /* Inifinite blocking call, waiting for transmission */ |
4020 | restart: | |
4021 | ret = lttng_poll_wait(&events, -1); | |
4022 | if (ret < 0) { | |
4023 | /* | |
4024 | * Restart interrupted system call. | |
4025 | */ | |
4026 | if (errno == EINTR) { | |
4027 | goto restart; | |
4028 | } | |
4029 | goto error; | |
4030 | } | |
4031 | ||
0d9c5d77 DG |
4032 | nb_fd = ret; |
4033 | ||
44a5e5eb DG |
4034 | for (i = 0; i < nb_fd; i++) { |
4035 | /* Fetch once the poll data */ | |
4036 | revents = LTTNG_POLL_GETEV(&events, i); | |
4037 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4038 | ||
fd20dac9 MD |
4039 | if (!revents) { |
4040 | /* No activity for this FD (poll implementation). */ | |
4041 | continue; | |
4042 | } | |
4043 | ||
44a5e5eb | 4044 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4045 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
44a5e5eb | 4046 | if (ret) { |
139ac872 MD |
4047 | err = 0; |
4048 | goto exit; | |
44a5e5eb DG |
4049 | } |
4050 | ||
4051 | /* Event on the registration socket */ | |
4052 | if (pollfd == sock) { | |
4053 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
4054 | ERR("Health socket poll error"); | |
4055 | goto error; | |
4056 | } | |
4057 | } | |
4058 | } | |
4059 | ||
4060 | new_sock = lttcomm_accept_unix_sock(sock); | |
4061 | if (new_sock < 0) { | |
4062 | goto error; | |
4063 | } | |
4064 | ||
b662582b DG |
4065 | /* |
4066 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4067 | * show must go on. | |
4068 | */ | |
4069 | (void) utils_set_fd_cloexec(new_sock); | |
4070 | ||
44a5e5eb DG |
4071 | DBG("Receiving data from client for health..."); |
4072 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
4073 | if (ret <= 0) { | |
4074 | DBG("Nothing recv() from client... continuing"); | |
4075 | ret = close(new_sock); | |
4076 | if (ret) { | |
4077 | PERROR("close"); | |
4078 | } | |
4079 | new_sock = -1; | |
4080 | continue; | |
4081 | } | |
4082 | ||
4083 | rcu_thread_online(); | |
4084 | ||
53efb85a | 4085 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
4086 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
4087 | /* | |
4088 | * health_check_state returns 0 if health is | |
4089 | * bad. | |
4090 | */ | |
4091 | if (!health_check_state(health_sessiond, i)) { | |
4092 | reply.ret_code |= 1ULL << i; | |
4093 | } | |
44a5e5eb DG |
4094 | } |
4095 | ||
6c71277b | 4096 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
44a5e5eb DG |
4097 | |
4098 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
4099 | if (ret < 0) { | |
4100 | ERR("Failed to send health data back to client"); | |
4101 | } | |
4102 | ||
4103 | /* End of transmission */ | |
4104 | ret = close(new_sock); | |
4105 | if (ret) { | |
4106 | PERROR("close"); | |
4107 | } | |
4108 | new_sock = -1; | |
4109 | } | |
4110 | ||
139ac872 | 4111 | exit: |
44a5e5eb | 4112 | error: |
139ac872 MD |
4113 | if (err) { |
4114 | ERR("Health error occurred in %s", __func__); | |
4115 | } | |
44a5e5eb DG |
4116 | DBG("Health check thread dying"); |
4117 | unlink(health_unix_sock_path); | |
4118 | if (sock >= 0) { | |
4119 | ret = close(sock); | |
4120 | if (ret) { | |
4121 | PERROR("close"); | |
4122 | } | |
4123 | } | |
44a5e5eb DG |
4124 | |
4125 | lttng_poll_clean(&events); | |
4126 | ||
4127 | rcu_unregister_thread(); | |
4128 | return NULL; | |
4129 | } | |
4130 | ||
1d4b027a | 4131 | /* |
d063d709 DG |
4132 | * This thread manage all clients request using the unix client socket for |
4133 | * communication. | |
1d4b027a DG |
4134 | */ |
4135 | static void *thread_manage_clients(void *data) | |
4136 | { | |
139ac872 | 4137 | int sock = -1, ret, i, pollfd, err = -1; |
53a80697 | 4138 | int sock_error; |
5eb91c98 | 4139 | uint32_t revents, nb_fd; |
273ea72c | 4140 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 4141 | struct lttng_poll_event events; |
1d4b027a DG |
4142 | |
4143 | DBG("[thread] Manage client started"); | |
4144 | ||
f6a9efaa DG |
4145 | rcu_register_thread(); |
4146 | ||
6c71277b | 4147 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
927ca06a | 4148 | |
840cb59c | 4149 | health_code_update(); |
44a5e5eb | 4150 | |
1d4b027a DG |
4151 | ret = lttcomm_listen_unix_sock(client_sock); |
4152 | if (ret < 0) { | |
35df2755 | 4153 | goto error_listen; |
1d4b027a DG |
4154 | } |
4155 | ||
5eb91c98 DG |
4156 | /* |
4157 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
4158 | * more will be added to this poll set. | |
4159 | */ | |
d0b96690 | 4160 | ret = sessiond_set_thread_pollset(&events, 2); |
5eb91c98 | 4161 | if (ret < 0) { |
35df2755 | 4162 | goto error_create_poll; |
5eb91c98 | 4163 | } |
273ea72c | 4164 | |
5eb91c98 DG |
4165 | /* Add the application registration socket */ |
4166 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
4167 | if (ret < 0) { | |
4168 | goto error; | |
4169 | } | |
273ea72c | 4170 | |
ef367a93 JG |
4171 | sessiond_notify_ready(); |
4172 | ret = sem_post(&load_info->message_thread_ready); | |
4173 | if (ret) { | |
4174 | PERROR("sem_post message_thread_ready"); | |
4175 | goto error; | |
4176 | } | |
0bb7724a | 4177 | |
72453c8c MD |
4178 | /* This testpoint is after we signal readiness to the parent. */ |
4179 | if (testpoint(sessiond_thread_manage_clients)) { | |
4180 | goto error; | |
4181 | } | |
4182 | ||
e547b070 | 4183 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
6993eeb3 CB |
4184 | goto error; |
4185 | } | |
8ac94142 | 4186 | |
840cb59c | 4187 | health_code_update(); |
44a5e5eb | 4188 | |
1d4b027a | 4189 | while (1) { |
1d4b027a | 4190 | DBG("Accepting client command ..."); |
273ea72c DG |
4191 | |
4192 | /* Inifinite blocking call, waiting for transmission */ | |
88f2b785 | 4193 | restart: |
a78af745 | 4194 | health_poll_entry(); |
5eb91c98 | 4195 | ret = lttng_poll_wait(&events, -1); |
a78af745 | 4196 | health_poll_exit(); |
273ea72c | 4197 | if (ret < 0) { |
88f2b785 MD |
4198 | /* |
4199 | * Restart interrupted system call. | |
4200 | */ | |
4201 | if (errno == EINTR) { | |
4202 | goto restart; | |
4203 | } | |
273ea72c DG |
4204 | goto error; |
4205 | } | |
4206 | ||
0d9c5d77 DG |
4207 | nb_fd = ret; |
4208 | ||
5eb91c98 DG |
4209 | for (i = 0; i < nb_fd; i++) { |
4210 | /* Fetch once the poll data */ | |
4211 | revents = LTTNG_POLL_GETEV(&events, i); | |
4212 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
4213 | ||
840cb59c | 4214 | health_code_update(); |
44a5e5eb | 4215 | |
fd20dac9 MD |
4216 | if (!revents) { |
4217 | /* No activity for this FD (poll implementation). */ | |
4218 | continue; | |
4219 | } | |
4220 | ||
5eb91c98 | 4221 | /* Thread quit pipe has been closed. Killing thread. */ |
d0b96690 | 4222 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
5eb91c98 | 4223 | if (ret) { |
139ac872 MD |
4224 | err = 0; |
4225 | goto exit; | |
5eb91c98 DG |
4226 | } |
4227 | ||
4228 | /* Event on the registration socket */ | |
4229 | if (pollfd == client_sock) { | |
4230 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
4231 | ERR("Client socket poll error"); | |
4232 | goto error; | |
4233 | } | |
4234 | } | |
4235 | } | |
4236 | ||
4237 | DBG("Wait for client response"); | |
4238 | ||
840cb59c | 4239 | health_code_update(); |
44a5e5eb | 4240 | |
5eb91c98 DG |
4241 | sock = lttcomm_accept_unix_sock(client_sock); |
4242 | if (sock < 0) { | |
273ea72c | 4243 | goto error; |
273ea72c DG |
4244 | } |
4245 | ||
b662582b DG |
4246 | /* |
4247 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
4248 | * show must go on. | |
4249 | */ | |
4250 | (void) utils_set_fd_cloexec(sock); | |
4251 | ||
be040666 DG |
4252 | /* Set socket option for credentials retrieval */ |
4253 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
4254 | if (ret < 0) { | |
4255 | goto error; | |
4256 | } | |
4257 | ||
5eb91c98 | 4258 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 4259 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 4260 | if (cmd_ctx == NULL) { |
76d7553f | 4261 | PERROR("zmalloc cmd_ctx"); |
1d4b027a | 4262 | goto error; |
5eb91c98 | 4263 | } |
1d4b027a | 4264 | |
5eb91c98 | 4265 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 4266 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 4267 | if (cmd_ctx->lsm == NULL) { |
76d7553f | 4268 | PERROR("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
4269 | goto error; |
4270 | } | |
1d4b027a | 4271 | |
5eb91c98 DG |
4272 | cmd_ctx->llm = NULL; |
4273 | cmd_ctx->session = NULL; | |
1d4b027a | 4274 | |
840cb59c | 4275 | health_code_update(); |
44a5e5eb | 4276 | |
5eb91c98 DG |
4277 | /* |
4278 | * Data is received from the lttng client. The struct | |
4279 | * lttcomm_session_msg (lsm) contains the command and data request of | |
4280 | * the client. | |
4281 | */ | |
4282 | DBG("Receiving data from client ..."); | |
be040666 DG |
4283 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
4284 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
4285 | if (ret <= 0) { |
4286 | DBG("Nothing recv() from client... continuing"); | |
76d7553f MD |
4287 | ret = close(sock); |
4288 | if (ret) { | |
4289 | PERROR("close"); | |
4290 | } | |
4291 | sock = -1; | |
a2c0da86 | 4292 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4293 | continue; |
4294 | } | |
1d4b027a | 4295 | |
840cb59c | 4296 | health_code_update(); |
44a5e5eb | 4297 | |
5eb91c98 DG |
4298 | // TODO: Validate cmd_ctx including sanity check for |
4299 | // security purpose. | |
f7776ea7 | 4300 | |
f6a9efaa | 4301 | rcu_thread_online(); |
5eb91c98 DG |
4302 | /* |
4303 | * This function dispatch the work to the kernel or userspace tracer | |
4304 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
4305 | * informations for the client. The command context struct contains | |
4306 | * everything this function may needs. | |
4307 | */ | |
53a80697 | 4308 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
f6a9efaa | 4309 | rcu_thread_offline(); |
5eb91c98 | 4310 | if (ret < 0) { |
36134aa1 DG |
4311 | ret = close(sock); |
4312 | if (ret) { | |
4313 | PERROR("close"); | |
53a80697 | 4314 | } |
36134aa1 | 4315 | sock = -1; |
bbd973c2 | 4316 | /* |
5eb91c98 | 4317 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 4318 | * this point, ret < 0 means that a zmalloc failed |
53a80697 MD |
4319 | * (ENOMEM). Error detected but still accept |
4320 | * command, unless a socket error has been | |
4321 | * detected. | |
bbd973c2 | 4322 | */ |
bbd973c2 | 4323 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
4324 | continue; |
4325 | } | |
d6e4fca4 | 4326 | |
840cb59c | 4327 | health_code_update(); |
44a5e5eb | 4328 | |
54d01ffb DG |
4329 | DBG("Sending response (size: %d, retcode: %s)", |
4330 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 4331 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 4332 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
4333 | if (ret < 0) { |
4334 | ERR("Failed to send data back to client"); | |
bbd973c2 | 4335 | } |
1d4b027a | 4336 | |
5eb91c98 | 4337 | /* End of transmission */ |
76d7553f MD |
4338 | ret = close(sock); |
4339 | if (ret) { | |
4340 | PERROR("close"); | |
4341 | } | |
4342 | sock = -1; | |
be040666 DG |
4343 | |
4344 | clean_command_ctx(&cmd_ctx); | |
44a5e5eb | 4345 | |
840cb59c | 4346 | health_code_update(); |
273ea72c DG |
4347 | } |
4348 | ||
139ac872 | 4349 | exit: |
5eb91c98 | 4350 | error: |
35df2755 CB |
4351 | if (sock >= 0) { |
4352 | ret = close(sock); | |
4353 | if (ret) { | |
4354 | PERROR("close"); | |
4355 | } | |
139ac872 | 4356 | } |
44a5e5eb | 4357 | |
35df2755 CB |
4358 | lttng_poll_clean(&events); |
4359 | clean_command_ctx(&cmd_ctx); | |
4360 | ||
4361 | error_listen: | |
4362 | error_create_poll: | |
273ea72c | 4363 | unlink(client_unix_sock_path); |
76d7553f MD |
4364 | if (client_sock >= 0) { |
4365 | ret = close(client_sock); | |
4366 | if (ret) { | |
4367 | PERROR("close"); | |
4368 | } | |
a4b35e07 | 4369 | } |
35df2755 CB |
4370 | |
4371 | if (err) { | |
840cb59c | 4372 | health_error(); |
35df2755 | 4373 | ERR("Health error occurred in %s", __func__); |
a4b35e07 | 4374 | } |
273ea72c | 4375 | |
8782cc74 | 4376 | health_unregister(health_sessiond); |
35df2755 CB |
4377 | |
4378 | DBG("Client thread dying"); | |
f6a9efaa DG |
4379 | |
4380 | rcu_unregister_thread(); | |
4a15001e MD |
4381 | |
4382 | /* | |
4383 | * Since we are creating the consumer threads, we own them, so we need | |
4384 | * to join them before our thread exits. | |
4385 | */ | |
4386 | ret = join_consumer_thread(&kconsumer_data); | |
4387 | if (ret) { | |
4388 | errno = ret; | |
4389 | PERROR("join_consumer"); | |
4390 | } | |
4391 | ||
4392 | ret = join_consumer_thread(&ustconsumer32_data); | |
4393 | if (ret) { | |
4394 | errno = ret; | |
4395 | PERROR("join_consumer ust32"); | |
4396 | } | |
4397 | ||
4398 | ret = join_consumer_thread(&ustconsumer64_data); | |
4399 | if (ret) { | |
4400 | errno = ret; | |
4401 | PERROR("join_consumer ust64"); | |
4402 | } | |
1d4b027a DG |
4403 | return NULL; |
4404 | } | |
4405 | ||
4406 | ||
fac6795d DG |
4407 | /* |
4408 | * usage function on stderr | |
4409 | */ | |
4410 | static void usage(void) | |
4411 | { | |
b716ce68 | 4412 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
4413 | fprintf(stderr, " -h, --help Display this usage.\n"); |
4414 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
4415 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
4416 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
4417 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
4418 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
4419 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
4420 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
4421 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
4422 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
4423 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
4424 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
4425 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 | 4426 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
72dd7491 | 4427 | fprintf(stderr, " -b, --background Start as a daemon, keeping console open.\n"); |
d6f42150 DG |
4428 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); |
4429 | fprintf(stderr, " -V, --version Show version number.\n"); | |
7fe6d2c5 | 4430 | fprintf(stderr, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n"); |
d6f42150 DG |
4431 | fprintf(stderr, " -q, --quiet No output at all.\n"); |
4432 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
35f90c40 | 4433 | fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n"); |
3bd1e081 | 4434 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 4435 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
1b2ef7fe | 4436 | fprintf(stderr, " --agent-tcp-port Agent registration TCP port\n"); |
76d01ebb | 4437 | fprintf(stderr, " -f --config PATH Load daemon configuration file\n"); |
ef367a93 | 4438 | fprintf(stderr, " -l --load PATH Load session configuration\n"); |
fbb9748b | 4439 | fprintf(stderr, " --kmod-probes Specify kernel module probes to load\n"); |
c9d42407 | 4440 | fprintf(stderr, " --extra-kmod-probes Specify extra kernel module probes to load\n"); |
fac6795d DG |
4441 | } |
4442 | ||
4443 | /* | |
26296c48 JG |
4444 | * Take an option from the getopt output and set it in the right variable to be |
4445 | * used later. | |
4446 | * | |
4447 | * Return 0 on success else a negative value. | |
fac6795d | 4448 | */ |
26296c48 | 4449 | static int set_option(int opt, const char *arg, const char *optname) |
fac6795d | 4450 | { |
26296c48 | 4451 | int ret = 0; |
fac6795d | 4452 | |
c5d350b2 JG |
4453 | if (arg && arg[0] == '\0') { |
4454 | /* | |
4455 | * This only happens if the value is read from daemon config | |
4456 | * file. This means the option requires an argument and the | |
4457 | * configuration file contains a line such as: | |
4458 | * my_option = | |
4459 | */ | |
4460 | ret = -EINVAL; | |
4461 | goto end; | |
4462 | } | |
4463 | ||
26296c48 JG |
4464 | switch (opt) { |
4465 | case 0: | |
4466 | fprintf(stderr, "option %s", optname); | |
4467 | if (arg) { | |
4468 | fprintf(stderr, " with arg %s\n", arg); | |
fac6795d | 4469 | } |
26296c48 JG |
4470 | break; |
4471 | case 'c': | |
e8fa9fb0 MD |
4472 | if (lttng_is_setuid_setgid()) { |
4473 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4474 | "-c, --client-sock"); | |
4475 | } else { | |
4476 | snprintf(client_unix_sock_path, PATH_MAX, "%s", arg); | |
4477 | } | |
26296c48 JG |
4478 | break; |
4479 | case 'a': | |
e8fa9fb0 MD |
4480 | if (lttng_is_setuid_setgid()) { |
4481 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4482 | "-a, --apps-sock"); | |
4483 | } else { | |
4484 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg); | |
4485 | } | |
26296c48 JG |
4486 | break; |
4487 | case 'd': | |
4488 | opt_daemon = 1; | |
4489 | break; | |
72dd7491 MD |
4490 | case 'b': |
4491 | opt_background = 1; | |
4492 | break; | |
26296c48 | 4493 | case 'g': |
e8fa9fb0 MD |
4494 | if (lttng_is_setuid_setgid()) { |
4495 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4496 | "-g, --group"); | |
4497 | } else { | |
4498 | /* | |
4499 | * If the override option is set, the pointer points to a | |
4500 | * *non* const thus freeing it even though the variable type is | |
4501 | * set to const. | |
4502 | */ | |
4503 | if (tracing_group_name_override) { | |
4504 | free((void *) tracing_group_name); | |
4505 | } | |
4506 | tracing_group_name = strdup(arg); | |
4507 | if (!tracing_group_name) { | |
4508 | PERROR("strdup"); | |
4509 | ret = -ENOMEM; | |
4510 | } | |
4511 | tracing_group_name_override = 1; | |
db322c4d | 4512 | } |
26296c48 JG |
4513 | break; |
4514 | case 'h': | |
4515 | usage(); | |
4a15001e | 4516 | exit(EXIT_SUCCESS); |
26296c48 JG |
4517 | case 'V': |
4518 | fprintf(stdout, "%s\n", VERSION); | |
4519 | exit(EXIT_SUCCESS); | |
4520 | case 'S': | |
4521 | opt_sig_parent = 1; | |
4522 | break; | |
4523 | case 'E': | |
e8fa9fb0 MD |
4524 | if (lttng_is_setuid_setgid()) { |
4525 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4526 | "--kconsumerd-err-sock"); | |
4527 | } else { | |
4528 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4529 | } | |
26296c48 JG |
4530 | break; |
4531 | case 'C': | |
e8fa9fb0 MD |
4532 | if (lttng_is_setuid_setgid()) { |
4533 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4534 | "--kconsumerd-cmd-sock"); | |
4535 | } else { | |
4536 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4537 | } | |
26296c48 JG |
4538 | break; |
4539 | case 'F': | |
e8fa9fb0 MD |
4540 | if (lttng_is_setuid_setgid()) { |
4541 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4542 | "--ustconsumerd64-err-sock"); | |
4543 | } else { | |
4544 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4545 | } | |
26296c48 JG |
4546 | break; |
4547 | case 'D': | |
e8fa9fb0 MD |
4548 | if (lttng_is_setuid_setgid()) { |
4549 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4550 | "--ustconsumerd64-cmd-sock"); | |
4551 | } else { | |
4552 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4553 | } | |
26296c48 JG |
4554 | break; |
4555 | case 'H': | |
e8fa9fb0 MD |
4556 | if (lttng_is_setuid_setgid()) { |
4557 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4558 | "--ustconsumerd32-err-sock"); | |
4559 | } else { | |
4560 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg); | |
4561 | } | |
26296c48 JG |
4562 | break; |
4563 | case 'G': | |
e8fa9fb0 MD |
4564 | if (lttng_is_setuid_setgid()) { |
4565 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4566 | "--ustconsumerd32-cmd-sock"); | |
4567 | } else { | |
4568 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg); | |
4569 | } | |
26296c48 JG |
4570 | break; |
4571 | case 'N': | |
4572 | opt_no_kernel = 1; | |
4573 | break; | |
4574 | case 'q': | |
4575 | lttng_opt_quiet = 1; | |
4576 | break; | |
4577 | case 'v': | |
4578 | /* Verbose level can increase using multiple -v */ | |
4579 | if (arg) { | |
13755a18 | 4580 | /* Value obtained from config file */ |
26296c48 JG |
4581 | lttng_opt_verbose = config_parse_value(arg); |
4582 | } else { | |
13755a18 JG |
4583 | /* -v used on command line */ |
4584 | lttng_opt_verbose++; | |
26296c48 | 4585 | } |
13755a18 JG |
4586 | /* Clamp value to [0, 3] */ |
4587 | lttng_opt_verbose = lttng_opt_verbose < 0 ? 0 : | |
4588 | (lttng_opt_verbose <= 3 ? lttng_opt_verbose : 3); | |
26296c48 JG |
4589 | break; |
4590 | case 'Z': | |
4591 | if (arg) { | |
4592 | opt_verbose_consumer = config_parse_value(arg); | |
4593 | } else { | |
3bd1e081 | 4594 | opt_verbose_consumer += 1; |
26296c48 JG |
4595 | } |
4596 | break; | |
4597 | case 'u': | |
e8fa9fb0 MD |
4598 | if (lttng_is_setuid_setgid()) { |
4599 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4600 | "--consumerd32-path"); | |
4601 | } else { | |
4602 | if (consumerd32_bin_override) { | |
4603 | free((void *) consumerd32_bin); | |
4604 | } | |
4605 | consumerd32_bin = strdup(arg); | |
4606 | if (!consumerd32_bin) { | |
4607 | PERROR("strdup"); | |
4608 | ret = -ENOMEM; | |
4609 | } | |
4610 | consumerd32_bin_override = 1; | |
db322c4d | 4611 | } |
26296c48 JG |
4612 | break; |
4613 | case 'U': | |
e8fa9fb0 MD |
4614 | if (lttng_is_setuid_setgid()) { |
4615 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4616 | "--consumerd32-libdir"); | |
4617 | } else { | |
4618 | if (consumerd32_libdir_override) { | |
4619 | free((void *) consumerd32_libdir); | |
4620 | } | |
4621 | consumerd32_libdir = strdup(arg); | |
4622 | if (!consumerd32_libdir) { | |
4623 | PERROR("strdup"); | |
4624 | ret = -ENOMEM; | |
4625 | } | |
4626 | consumerd32_libdir_override = 1; | |
db322c4d | 4627 | } |
26296c48 JG |
4628 | break; |
4629 | case 't': | |
e8fa9fb0 MD |
4630 | if (lttng_is_setuid_setgid()) { |
4631 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4632 | "--consumerd64-path"); | |
4633 | } else { | |
4634 | if (consumerd64_bin_override) { | |
4635 | free((void *) consumerd64_bin); | |
4636 | } | |
4637 | consumerd64_bin = strdup(arg); | |
4638 | if (!consumerd64_bin) { | |
4639 | PERROR("strdup"); | |
4640 | ret = -ENOMEM; | |
4641 | } | |
4642 | consumerd64_bin_override = 1; | |
db322c4d | 4643 | } |
26296c48 JG |
4644 | break; |
4645 | case 'T': | |
e8fa9fb0 MD |
4646 | if (lttng_is_setuid_setgid()) { |
4647 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4648 | "--consumerd64-libdir"); | |
4649 | } else { | |
4650 | if (consumerd64_libdir_override) { | |
4651 | free((void *) consumerd64_libdir); | |
4652 | } | |
4653 | consumerd64_libdir = strdup(arg); | |
4654 | if (!consumerd64_libdir) { | |
4655 | PERROR("strdup"); | |
4656 | ret = -ENOMEM; | |
4657 | } | |
4658 | consumerd64_libdir_override = 1; | |
db322c4d | 4659 | } |
26296c48 JG |
4660 | break; |
4661 | case 'p': | |
e8fa9fb0 MD |
4662 | if (lttng_is_setuid_setgid()) { |
4663 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4664 | "-p, --pidfile"); | |
4665 | } else { | |
4666 | free(opt_pidfile); | |
4667 | opt_pidfile = strdup(arg); | |
4668 | if (!opt_pidfile) { | |
4669 | PERROR("strdup"); | |
4670 | ret = -ENOMEM; | |
4671 | } | |
db322c4d | 4672 | } |
26296c48 | 4673 | break; |
022d91ba | 4674 | case 'J': /* Agent TCP port. */ |
26296c48 | 4675 | { |
e8fa9fb0 MD |
4676 | if (lttng_is_setuid_setgid()) { |
4677 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4678 | "--agent-tcp-port"); | |
4679 | } else { | |
4680 | unsigned long v; | |
4d076222 | 4681 | |
e04aa23e JG |
4682 | if (!arg) { |
4683 | ret = -EINVAL; | |
4684 | goto end; | |
4685 | } | |
e8fa9fb0 MD |
4686 | errno = 0; |
4687 | v = strtoul(arg, NULL, 0); | |
4688 | if (errno != 0 || !isdigit(arg[0])) { | |
4689 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); | |
4690 | return -1; | |
4691 | } | |
4692 | if (v == 0 || v >= 65535) { | |
4693 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); | |
4694 | return -1; | |
4695 | } | |
4696 | agent_tcp_port = (uint32_t) v; | |
4697 | DBG3("Agent TCP port set to non default: %u", agent_tcp_port); | |
26296c48 | 4698 | } |
26296c48 JG |
4699 | break; |
4700 | } | |
ef367a93 | 4701 | case 'l': |
e8fa9fb0 MD |
4702 | if (lttng_is_setuid_setgid()) { |
4703 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4704 | "-l, --load"); | |
4705 | } else { | |
4706 | free(opt_load_session_path); | |
4707 | opt_load_session_path = strdup(arg); | |
4708 | if (!opt_load_session_path) { | |
4709 | PERROR("strdup"); | |
4710 | ret = -ENOMEM; | |
4711 | } | |
ef367a93 JG |
4712 | } |
4713 | break; | |
fbb9748b | 4714 | case 'P': /* probe modules list */ |
e8fa9fb0 MD |
4715 | if (lttng_is_setuid_setgid()) { |
4716 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4717 | "--kmod-probes"); | |
4718 | } else { | |
4719 | free(kmod_probes_list); | |
4720 | kmod_probes_list = strdup(arg); | |
4721 | if (!kmod_probes_list) { | |
4722 | PERROR("strdup"); | |
4723 | ret = -ENOMEM; | |
4724 | } | |
c9d42407 PP |
4725 | } |
4726 | break; | |
4727 | case 'e': | |
e8fa9fb0 MD |
4728 | if (lttng_is_setuid_setgid()) { |
4729 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4730 | "--extra-kmod-probes"); | |
4731 | } else { | |
4732 | free(kmod_extra_probes_list); | |
4733 | kmod_extra_probes_list = strdup(arg); | |
4734 | if (!kmod_extra_probes_list) { | |
4735 | PERROR("strdup"); | |
4736 | ret = -ENOMEM; | |
4737 | } | |
db322c4d | 4738 | } |
fbb9748b | 4739 | break; |
7ab02a27 DG |
4740 | case 'f': |
4741 | /* This is handled in set_options() thus silent break. */ | |
4742 | break; | |
26296c48 JG |
4743 | default: |
4744 | /* Unknown option or other error. | |
4745 | * Error is printed by getopt, just return */ | |
4746 | ret = -1; | |
4747 | } | |
4748 | ||
f3dd7ce7 | 4749 | end: |
c5d350b2 JG |
4750 | if (ret == -EINVAL) { |
4751 | const char *opt_name = "unknown"; | |
4752 | int i; | |
4753 | ||
4754 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); | |
4755 | i++) { | |
4756 | if (opt == long_options[i].val) { | |
4757 | opt_name = long_options[i].name; | |
4758 | break; | |
4759 | } | |
4760 | } | |
4761 | ||
4762 | WARN("Invalid argument provided for option \"%s\", using default value.", | |
4763 | opt_name); | |
4764 | } | |
f3dd7ce7 | 4765 | |
26296c48 JG |
4766 | return ret; |
4767 | } | |
4768 | ||
4769 | /* | |
4770 | * config_entry_handler_cb used to handle options read from a config file. | |
4771 | * See config_entry_handler_cb comment in common/config/config.h for the | |
4772 | * return value conventions. | |
4773 | */ | |
4774 | static int config_entry_handler(const struct config_entry *entry, void *unused) | |
4775 | { | |
4776 | int ret = 0, i; | |
4777 | ||
4778 | if (!entry || !entry->name || !entry->value) { | |
4779 | ret = -EINVAL; | |
4780 | goto end; | |
4781 | } | |
4782 | ||
4783 | /* Check if the option is to be ignored */ | |
4784 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { | |
4785 | if (!strcmp(entry->name, config_ignore_options[i])) { | |
4786 | goto end; | |
4787 | } | |
4788 | } | |
4789 | ||
4790 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; | |
4791 | i++) { | |
4792 | ||
4793 | /* Ignore if not fully matched. */ | |
4794 | if (strcmp(entry->name, long_options[i].name)) { | |
4795 | continue; | |
4796 | } | |
4797 | ||
4798 | /* | |
4799 | * If the option takes no argument on the command line, we have to | |
4800 | * check if the value is "true". We support non-zero numeric values, | |
4801 | * true, on and yes. | |
4802 | */ | |
4803 | if (!long_options[i].has_arg) { | |
4804 | ret = config_parse_value(entry->value); | |
4805 | if (ret <= 0) { | |
4806 | if (ret) { | |
4807 | WARN("Invalid configuration value \"%s\" for option %s", | |
4808 | entry->value, entry->name); | |
4809 | } | |
4810 | /* False, skip boolean config option. */ | |
4811 | goto end; | |
4d076222 | 4812 | } |
26296c48 JG |
4813 | } |
4814 | ||
4815 | ret = set_option(long_options[i].val, entry->value, entry->name); | |
4816 | goto end; | |
4817 | } | |
4818 | ||
4819 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); | |
4820 | ||
4821 | end: | |
4822 | return ret; | |
4823 | } | |
4824 | ||
4825 | /* | |
4826 | * daemon configuration loading and argument parsing | |
4827 | */ | |
4828 | static int set_options(int argc, char **argv) | |
4829 | { | |
4830 | int ret = 0, c = 0, option_index = 0; | |
4831 | int orig_optopt = optopt, orig_optind = optind; | |
4832 | char *optstring; | |
4833 | const char *config_path = NULL; | |
4834 | ||
4835 | optstring = utils_generate_optstring(long_options, | |
4836 | sizeof(long_options) / sizeof(struct option)); | |
4837 | if (!optstring) { | |
4838 | ret = -ENOMEM; | |
4839 | goto end; | |
4840 | } | |
4841 | ||
4842 | /* Check for the --config option */ | |
4843 | while ((c = getopt_long(argc, argv, optstring, long_options, | |
4844 | &option_index)) != -1) { | |
4845 | if (c == '?') { | |
4846 | ret = -EINVAL; | |
4847 | goto end; | |
4848 | } else if (c != 'f') { | |
4849 | /* if not equal to --config option. */ | |
4850 | continue; | |
4851 | } | |
4852 | ||
e8fa9fb0 MD |
4853 | if (lttng_is_setuid_setgid()) { |
4854 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", | |
4855 | "-f, --config"); | |
4856 | } else { | |
4857 | config_path = utils_expand_path(optarg); | |
4858 | if (!config_path) { | |
4859 | ERR("Failed to resolve path: %s", optarg); | |
4860 | } | |
26296c48 JG |
4861 | } |
4862 | } | |
4863 | ||
4864 | ret = config_get_section_entries(config_path, config_section_name, | |
4865 | config_entry_handler, NULL); | |
4866 | if (ret) { | |
4867 | if (ret > 0) { | |
4868 | ERR("Invalid configuration option at line %i", ret); | |
4869 | ret = -1; | |
4870 | } | |
4871 | goto end; | |
4872 | } | |
4873 | ||
4874 | /* Reset getopt's global state */ | |
4875 | optopt = orig_optopt; | |
4876 | optind = orig_optind; | |
4877 | while (1) { | |
4878 | c = getopt_long(argc, argv, optstring, long_options, &option_index); | |
4879 | if (c == -1) { | |
4d076222 DG |
4880 | break; |
4881 | } | |
26296c48 JG |
4882 | |
4883 | ret = set_option(c, optarg, long_options[option_index].name); | |
4884 | if (ret < 0) { | |
4885 | break; | |
fac6795d DG |
4886 | } |
4887 | } | |
4888 | ||
26296c48 JG |
4889 | end: |
4890 | free(optstring); | |
4891 | return ret; | |
fac6795d DG |
4892 | } |
4893 | ||
4894 | /* | |
d063d709 | 4895 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
4896 | * apps_sock - The communication socket for all UST apps. |
4897 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 4898 | */ |
cf3af59e | 4899 | static int init_daemon_socket(void) |
fac6795d DG |
4900 | { |
4901 | int ret = 0; | |
4902 | mode_t old_umask; | |
4903 | ||
4904 | old_umask = umask(0); | |
4905 | ||
4906 | /* Create client tool unix socket */ | |
d6f42150 DG |
4907 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
4908 | if (client_sock < 0) { | |
4909 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
4910 | ret = -1; |
4911 | goto end; | |
4912 | } | |
4913 | ||
b662582b DG |
4914 | /* Set the cloexec flag */ |
4915 | ret = utils_set_fd_cloexec(client_sock); | |
4916 | if (ret < 0) { | |
4917 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
4918 | "Continuing but note that the consumer daemon will have a " | |
4919 | "reference to this socket on exec()", client_sock); | |
4920 | } | |
4921 | ||
fac6795d DG |
4922 | /* File permission MUST be 660 */ |
4923 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
4924 | if (ret < 0) { | |
d6f42150 | 4925 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
76d7553f | 4926 | PERROR("chmod"); |
fac6795d DG |
4927 | goto end; |
4928 | } | |
4929 | ||
4930 | /* Create the application unix socket */ | |
d6f42150 DG |
4931 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
4932 | if (apps_sock < 0) { | |
4933 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
4934 | ret = -1; |
4935 | goto end; | |
4936 | } | |
4937 | ||
b662582b DG |
4938 | /* Set the cloexec flag */ |
4939 | ret = utils_set_fd_cloexec(apps_sock); | |
4940 | if (ret < 0) { | |
4941 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " | |
4942 | "Continuing but note that the consumer daemon will have a " | |
4943 | "reference to this socket on exec()", apps_sock); | |
4944 | } | |
4945 | ||
d6f42150 | 4946 | /* File permission MUST be 666 */ |
54d01ffb DG |
4947 | ret = chmod(apps_unix_sock_path, |
4948 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 4949 | if (ret < 0) { |
d6f42150 | 4950 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
76d7553f | 4951 | PERROR("chmod"); |
fac6795d DG |
4952 | goto end; |
4953 | } | |
4954 | ||
b662582b DG |
4955 | DBG3("Session daemon client socket %d and application socket %d created", |
4956 | client_sock, apps_sock); | |
4957 | ||
fac6795d DG |
4958 | end: |
4959 | umask(old_umask); | |
4960 | return ret; | |
4961 | } | |
4962 | ||
4963 | /* | |
54d01ffb DG |
4964 | * Check if the global socket is available, and if a daemon is answering at the |
4965 | * other side. If yes, error is returned. | |
fac6795d | 4966 | */ |
cf3af59e | 4967 | static int check_existing_daemon(void) |
fac6795d | 4968 | { |
7d8234d9 | 4969 | /* Is there anybody out there ? */ |
099e26bd | 4970 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 4971 | return -EEXIST; |
099e26bd | 4972 | } |
b09c7c76 DG |
4973 | |
4974 | return 0; | |
fac6795d DG |
4975 | } |
4976 | ||
fac6795d | 4977 | /* |
d063d709 | 4978 | * Set the tracing group gid onto the client socket. |
5e16da05 | 4979 | * |
d063d709 | 4980 | * Race window between mkdir and chown is OK because we are going from more |
d1613cf5 | 4981 | * permissive (root.root) to less permissive (root.tracing). |
fac6795d | 4982 | */ |
be040666 | 4983 | static int set_permissions(char *rundir) |
fac6795d DG |
4984 | { |
4985 | int ret; | |
996b65c8 | 4986 | gid_t gid; |
fac6795d | 4987 | |
6c71277b | 4988 | gid = utils_get_group_id(tracing_group_name); |
fac6795d | 4989 | |
d6f42150 | 4990 | /* Set lttng run dir */ |
be040666 | 4991 | ret = chown(rundir, 0, gid); |
d6f42150 | 4992 | if (ret < 0) { |
be040666 | 4993 | ERR("Unable to set group on %s", rundir); |
76d7553f | 4994 | PERROR("chown"); |
d6f42150 DG |
4995 | } |
4996 | ||
6c71277b MD |
4997 | /* |
4998 | * Ensure all applications and tracing group can search the run | |
4999 | * dir. Allow everyone to read the directory, since it does not | |
5000 | * buy us anything to hide its content. | |
5001 | */ | |
5002 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
d1613cf5 JN |
5003 | if (ret < 0) { |
5004 | ERR("Unable to set permissions on %s", rundir); | |
76d7553f | 5005 | PERROR("chmod"); |
d1613cf5 JN |
5006 | } |
5007 | ||
d6f42150 | 5008 | /* lttng client socket path */ |
996b65c8 | 5009 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 5010 | if (ret < 0) { |
d6f42150 | 5011 | ERR("Unable to set group on %s", client_unix_sock_path); |
76d7553f | 5012 | PERROR("chown"); |
d6f42150 DG |
5013 | } |
5014 | ||
3bd1e081 | 5015 | /* kconsumer error socket path */ |
6c71277b | 5016 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
d6f42150 | 5017 | if (ret < 0) { |
3bd1e081 | 5018 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
76d7553f | 5019 | PERROR("chown"); |
3bd1e081 MD |
5020 | } |
5021 | ||
7753dea8 | 5022 | /* 64-bit ustconsumer error socket path */ |
6c71277b | 5023 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
7753dea8 MD |
5024 | if (ret < 0) { |
5025 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
76d7553f | 5026 | PERROR("chown"); |
7753dea8 MD |
5027 | } |
5028 | ||
5029 | /* 32-bit ustconsumer compat32 error socket path */ | |
6c71277b | 5030 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
3bd1e081 | 5031 | if (ret < 0) { |
7753dea8 | 5032 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
76d7553f | 5033 | PERROR("chown"); |
fac6795d DG |
5034 | } |
5035 | ||
d6f42150 | 5036 | DBG("All permissions are set"); |
e07ae692 | 5037 | |
fac6795d DG |
5038 | return ret; |
5039 | } | |
5040 | ||
d6f42150 | 5041 | /* |
d063d709 | 5042 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 5043 | */ |
67e40797 | 5044 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
5045 | { |
5046 | int ret; | |
5047 | ||
67e40797 DG |
5048 | DBG3("Creating LTTng run directory: %s", rundir); |
5049 | ||
d1613cf5 | 5050 | ret = mkdir(rundir, S_IRWXU); |
d6f42150 | 5051 | if (ret < 0) { |
b1f11e69 | 5052 | if (errno != EEXIST) { |
67e40797 | 5053 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
5054 | goto error; |
5055 | } else { | |
5056 | ret = 0; | |
5057 | } | |
d6f42150 DG |
5058 | } |
5059 | ||
5060 | error: | |
5061 | return ret; | |
5062 | } | |
5063 | ||
5064 | /* | |
d063d709 DG |
5065 | * Setup sockets and directory needed by the kconsumerd communication with the |
5066 | * session daemon. | |
d6f42150 | 5067 | */ |
67e40797 DG |
5068 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
5069 | const char *rundir) | |
d6f42150 DG |
5070 | { |
5071 | int ret; | |
67e40797 | 5072 | char path[PATH_MAX]; |
d6f42150 | 5073 | |
6c71277b | 5074 | switch (consumer_data->type) { |
7753dea8 | 5075 | case LTTNG_CONSUMER_KERNEL: |
60922cb0 | 5076 | snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir); |
7753dea8 MD |
5077 | break; |
5078 | case LTTNG_CONSUMER64_UST: | |
60922cb0 | 5079 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
5080 | break; |
5081 | case LTTNG_CONSUMER32_UST: | |
60922cb0 | 5082 | snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
5083 | break; |
5084 | default: | |
5085 | ERR("Consumer type unknown"); | |
5086 | ret = -EINVAL; | |
5087 | goto error; | |
d6f42150 DG |
5088 | } |
5089 | ||
67e40797 DG |
5090 | DBG2("Creating consumer directory: %s", path); |
5091 | ||
6c71277b | 5092 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
d6f42150 | 5093 | if (ret < 0) { |
6beb2242 | 5094 | if (errno != EEXIST) { |
f11e84c2 | 5095 | PERROR("mkdir"); |
3bd1e081 | 5096 | ERR("Failed to create %s", path); |
6beb2242 DG |
5097 | goto error; |
5098 | } | |
f11e84c2 | 5099 | ret = -1; |
d6f42150 | 5100 | } |
6c71277b MD |
5101 | if (is_root) { |
5102 | ret = chown(path, 0, utils_get_group_id(tracing_group_name)); | |
5103 | if (ret < 0) { | |
5104 | ERR("Unable to set group on %s", path); | |
5105 | PERROR("chown"); | |
5106 | goto error; | |
5107 | } | |
5108 | } | |
d6f42150 DG |
5109 | |
5110 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
5111 | consumer_data->err_sock = |
5112 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
5113 | if (consumer_data->err_sock < 0) { | |
5114 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
5115 | ret = -1; |
5116 | goto error; | |
5117 | } | |
5118 | ||
a24f05ab MD |
5119 | /* |
5120 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
5121 | * show must go on. | |
5122 | */ | |
5123 | ret = utils_set_fd_cloexec(consumer_data->err_sock); | |
5124 | if (ret < 0) { | |
5125 | PERROR("utils_set_fd_cloexec"); | |
5126 | /* continue anyway */ | |
5127 | } | |
5128 | ||
d6f42150 | 5129 | /* File permission MUST be 660 */ |
3bd1e081 | 5130 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 5131 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 5132 | if (ret < 0) { |
3bd1e081 | 5133 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 5134 | PERROR("chmod"); |
d6f42150 DG |
5135 | goto error; |
5136 | } | |
5137 | ||
5138 | error: | |
5139 | return ret; | |
5140 | } | |
5141 | ||
fac6795d | 5142 | /* |
d063d709 | 5143 | * Signal handler for the daemon |
cf3af59e | 5144 | * |
54d01ffb DG |
5145 | * Simply stop all worker threads, leaving main() return gracefully after |
5146 | * joining all threads and calling cleanup(). | |
fac6795d DG |
5147 | */ |
5148 | static void sighandler(int sig) | |
5149 | { | |
5150 | switch (sig) { | |
cf3af59e | 5151 | case SIGPIPE: |
af87c45a | 5152 | DBG("SIGPIPE caught"); |
cf3af59e MD |
5153 | return; |
5154 | case SIGINT: | |
af87c45a | 5155 | DBG("SIGINT caught"); |
cf3af59e MD |
5156 | stop_threads(); |
5157 | break; | |
5158 | case SIGTERM: | |
af87c45a | 5159 | DBG("SIGTERM caught"); |
cf3af59e MD |
5160 | stop_threads(); |
5161 | break; | |
0bb7724a DG |
5162 | case SIGUSR1: |
5163 | CMM_STORE_SHARED(recv_child_signal, 1); | |
5164 | break; | |
cf3af59e MD |
5165 | default: |
5166 | break; | |
fac6795d | 5167 | } |
fac6795d DG |
5168 | } |
5169 | ||
5170 | /* | |
d063d709 | 5171 | * Setup signal handler for : |
1d4b027a | 5172 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 5173 | */ |
1d4b027a | 5174 | static int set_signal_handler(void) |
fac6795d | 5175 | { |
1d4b027a DG |
5176 | int ret = 0; |
5177 | struct sigaction sa; | |
5178 | sigset_t sigset; | |
fac6795d | 5179 | |
1d4b027a | 5180 | if ((ret = sigemptyset(&sigset)) < 0) { |
76d7553f | 5181 | PERROR("sigemptyset"); |
1d4b027a DG |
5182 | return ret; |
5183 | } | |
d6f42150 | 5184 | |
1d4b027a DG |
5185 | sa.sa_handler = sighandler; |
5186 | sa.sa_mask = sigset; | |
5187 | sa.sa_flags = 0; | |
5188 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
76d7553f | 5189 | PERROR("sigaction"); |
1d4b027a | 5190 | return ret; |
d6f42150 DG |
5191 | } |
5192 | ||
1d4b027a | 5193 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
76d7553f | 5194 | PERROR("sigaction"); |
1d4b027a | 5195 | return ret; |
d6f42150 | 5196 | } |
aaf26714 | 5197 | |
1d4b027a | 5198 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
76d7553f | 5199 | PERROR("sigaction"); |
1d4b027a | 5200 | return ret; |
8c0faa1d DG |
5201 | } |
5202 | ||
0bb7724a DG |
5203 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
5204 | PERROR("sigaction"); | |
5205 | return ret; | |
5206 | } | |
5207 | ||
5208 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); | |
1d4b027a DG |
5209 | |
5210 | return ret; | |
fac6795d DG |
5211 | } |
5212 | ||
f3ed775e | 5213 | /* |
d063d709 DG |
5214 | * Set open files limit to unlimited. This daemon can open a large number of |
5215 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
5216 | */ |
5217 | static void set_ulimit(void) | |
5218 | { | |
5219 | int ret; | |
5220 | struct rlimit lim; | |
5221 | ||
a88df331 | 5222 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
5223 | lim.rlim_cur = 65535; |
5224 | lim.rlim_max = 65535; | |
5225 | ||
5226 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
5227 | if (ret < 0) { | |
76d7553f | 5228 | PERROR("failed to set open files limit"); |
f3ed775e DG |
5229 | } |
5230 | } | |
5231 | ||
35f90c40 DG |
5232 | /* |
5233 | * Write pidfile using the rundir and opt_pidfile. | |
5234 | */ | |
4a15001e | 5235 | static int write_pidfile(void) |
35f90c40 DG |
5236 | { |
5237 | int ret; | |
5238 | char pidfile_path[PATH_MAX]; | |
5239 | ||
5240 | assert(rundir); | |
5241 | ||
5242 | if (opt_pidfile) { | |
5243 | strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path)); | |
5244 | } else { | |
5245 | /* Build pidfile path from rundir and opt_pidfile. */ | |
5246 | ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/" | |
5247 | DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir); | |
5248 | if (ret < 0) { | |
5249 | PERROR("snprintf pidfile path"); | |
5250 | goto error; | |
5251 | } | |
5252 | } | |
5253 | ||
5254 | /* | |
4a15001e | 5255 | * Create pid file in rundir. |
35f90c40 | 5256 | */ |
4a15001e | 5257 | ret = utils_create_pid_file(getpid(), pidfile_path); |
35f90c40 | 5258 | error: |
4a15001e | 5259 | return ret; |
35f90c40 DG |
5260 | } |
5261 | ||
c9cb3e7d JG |
5262 | /* |
5263 | * Create lockfile using the rundir and return its fd. | |
5264 | */ | |
5265 | static int create_lockfile(void) | |
5266 | { | |
5267 | int ret; | |
5268 | char lockfile_path[PATH_MAX]; | |
5269 | ||
5270 | ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path)); | |
5271 | if (ret < 0) { | |
5272 | goto error; | |
5273 | } | |
5274 | ||
5275 | ret = utils_create_lock_file(lockfile_path); | |
5276 | error: | |
5277 | return ret; | |
5278 | } | |
5279 | ||
cd9290dd | 5280 | /* |
022d91ba | 5281 | * Write agent TCP port using the rundir. |
cd9290dd | 5282 | */ |
4a15001e | 5283 | static int write_agent_port(void) |
cd9290dd DG |
5284 | { |
5285 | int ret; | |
5286 | char path[PATH_MAX]; | |
5287 | ||
5288 | assert(rundir); | |
5289 | ||
5290 | ret = snprintf(path, sizeof(path), "%s/" | |
022d91ba | 5291 | DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE, rundir); |
cd9290dd | 5292 | if (ret < 0) { |
022d91ba | 5293 | PERROR("snprintf agent port path"); |
cd9290dd DG |
5294 | goto error; |
5295 | } | |
5296 | ||
5297 | /* | |
4a15001e | 5298 | * Create TCP agent port file in rundir. |
cd9290dd | 5299 | */ |
4a15001e | 5300 | ret = utils_create_pid_file(agent_tcp_port, path); |
cd9290dd DG |
5301 | |
5302 | error: | |
4a15001e | 5303 | return ret; |
ef367a93 JG |
5304 | } |
5305 | ||
fac6795d DG |
5306 | /* |
5307 | * main | |
5308 | */ | |
5309 | int main(int argc, char **argv) | |
5310 | { | |
4a15001e | 5311 | int ret = 0, retval = 0; |
fac6795d | 5312 | void *status; |
ae9e45b3 | 5313 | const char *home_path, *env_app_timeout; |
fac6795d | 5314 | |
335a95b7 MD |
5315 | init_kernel_workarounds(); |
5316 | ||
f6a9efaa DG |
5317 | rcu_register_thread(); |
5318 | ||
4a15001e MD |
5319 | if (set_signal_handler()) { |
5320 | retval = -1; | |
5321 | goto exit_set_signal_handler; | |
0bb7724a DG |
5322 | } |
5323 | ||
7753dea8 | 5324 | setup_consumerd_path(); |
fb09408a | 5325 | |
12744796 DG |
5326 | page_size = sysconf(_SC_PAGESIZE); |
5327 | if (page_size < 0) { | |
5328 | PERROR("sysconf _SC_PAGESIZE"); | |
5329 | page_size = LONG_MAX; | |
5330 | WARN("Fallback page size to %ld", page_size); | |
5331 | } | |
5332 | ||
4a15001e MD |
5333 | /* |
5334 | * Parse arguments and load the daemon configuration file. | |
5335 | * | |
5336 | * We have an exit_options exit path to free memory reserved by | |
5337 | * set_options. This is needed because the rest of sessiond_cleanup() | |
5338 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which | |
5339 | * depends on set_options. | |
5340 | */ | |
fac6795d | 5341 | progname = argv[0]; |
4a15001e MD |
5342 | if (set_options(argc, argv)) { |
5343 | retval = -1; | |
5344 | goto exit_options; | |
fac6795d DG |
5345 | } |
5346 | ||
5347 | /* Daemonize */ | |
72dd7491 | 5348 | if (opt_daemon || opt_background) { |
ceed52b5 MD |
5349 | int i; |
5350 | ||
72dd7491 MD |
5351 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
5352 | !opt_background); | |
53094c05 | 5353 | if (ret < 0) { |
4a15001e MD |
5354 | retval = -1; |
5355 | goto exit_options; | |
53094c05 | 5356 | } |
0bb7724a | 5357 | |
ceed52b5 | 5358 | /* |
0bb7724a | 5359 | * We are in the child. Make sure all other file descriptors are |
4a15001e MD |
5360 | * closed, in case we are called with more opened file |
5361 | * descriptors than the standard ones. | |
ceed52b5 MD |
5362 | */ |
5363 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
5364 | (void) close(i); | |
5365 | } | |
5366 | } | |
5367 | ||
4a15001e MD |
5368 | /* |
5369 | * Starting from here, we can create threads. This needs to be after | |
5370 | * lttng_daemonize due to RCU. | |
5371 | */ | |
5372 | ||
5373 | /* | |
5374 | * Initialize the health check subsystem. This call should set the | |
5375 | * appropriate time values. | |
5376 | */ | |
5377 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); | |
5378 | if (!health_sessiond) { | |
5379 | PERROR("health_app_create error"); | |
5380 | retval = -1; | |
5381 | goto exit_health_sessiond_cleanup; | |
5382 | } | |
5383 | ||
5384 | if (init_ht_cleanup_quit_pipe()) { | |
5385 | retval = -1; | |
5386 | goto exit_ht_cleanup_quit_pipe; | |
5387 | } | |
5388 | ||
5389 | /* Setup the thread ht_cleanup communication pipe. */ | |
5390 | if (utils_create_pipe_cloexec(ht_cleanup_pipe)) { | |
5391 | retval = -1; | |
5392 | goto exit_ht_cleanup_pipe; | |
5393 | } | |
5394 | ||
25b397f9 MD |
5395 | /* Set up max poll set size */ |
5396 | if (lttng_poll_set_max_size()) { | |
5397 | retval = -1; | |
5398 | goto exit_set_max_size; | |
5399 | } | |
5400 | ||
4a15001e MD |
5401 | /* Create thread to clean up RCU hash tables */ |
5402 | ret = pthread_create(&ht_cleanup_thread, NULL, | |
5403 | thread_ht_cleanup, (void *) NULL); | |
5404 | if (ret) { | |
5405 | errno = ret; | |
5406 | PERROR("pthread_create ht_cleanup"); | |
5407 | retval = -1; | |
5408 | goto exit_ht_cleanup; | |
5409 | } | |
5410 | ||
ceed52b5 | 5411 | /* Create thread quit pipe */ |
4a15001e MD |
5412 | if (init_thread_quit_pipe()) { |
5413 | retval = -1; | |
5414 | goto exit_init_data; | |
fac6795d DG |
5415 | } |
5416 | ||
5417 | /* Check if daemon is UID = 0 */ | |
5418 | is_root = !getuid(); | |
5419 | ||
fac6795d | 5420 | if (is_root) { |
990570ed | 5421 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
4ea184d1 | 5422 | if (!rundir) { |
4a15001e MD |
5423 | retval = -1; |
5424 | goto exit_init_data; | |
4ea184d1 | 5425 | } |
67e40797 DG |
5426 | |
5427 | /* Create global run dir with root access */ | |
4a15001e MD |
5428 | if (create_lttng_rundir(rundir)) { |
5429 | retval = -1; | |
5430 | goto exit_init_data; | |
d6f42150 DG |
5431 | } |
5432 | ||
fac6795d | 5433 | if (strlen(apps_unix_sock_path) == 0) { |
4a15001e | 5434 | ret = snprintf(apps_unix_sock_path, PATH_MAX, |
d6f42150 | 5435 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); |
4a15001e MD |
5436 | if (ret < 0) { |
5437 | retval = -1; | |
5438 | goto exit_init_data; | |
5439 | } | |
fac6795d DG |
5440 | } |
5441 | ||
5442 | if (strlen(client_unix_sock_path) == 0) { | |
4a15001e | 5443 | ret = snprintf(client_unix_sock_path, PATH_MAX, |
d6f42150 | 5444 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); |
4a15001e MD |
5445 | if (ret < 0) { |
5446 | retval = -1; | |
5447 | goto exit_init_data; | |
5448 | } | |
d6f42150 | 5449 | } |
0fdd1e2c DG |
5450 | |
5451 | /* Set global SHM for ust */ | |
5452 | if (strlen(wait_shm_path) == 0) { | |
4a15001e | 5453 | ret = snprintf(wait_shm_path, PATH_MAX, |
0fdd1e2c | 5454 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); |
4a15001e MD |
5455 | if (ret < 0) { |
5456 | retval = -1; | |
5457 | goto exit_init_data; | |
5458 | } | |
0fdd1e2c | 5459 | } |
67e40797 | 5460 | |
44a5e5eb | 5461 | if (strlen(health_unix_sock_path) == 0) { |
4a15001e MD |
5462 | ret = snprintf(health_unix_sock_path, |
5463 | sizeof(health_unix_sock_path), | |
44a5e5eb | 5464 | DEFAULT_GLOBAL_HEALTH_UNIX_SOCK); |
4a15001e MD |
5465 | if (ret < 0) { |
5466 | retval = -1; | |
5467 | goto exit_init_data; | |
5468 | } | |
44a5e5eb DG |
5469 | } |
5470 | ||
67e40797 | 5471 | /* Setup kernel consumerd path */ |
4a15001e | 5472 | ret = snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 5473 | DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir); |
4a15001e MD |
5474 | if (ret < 0) { |
5475 | retval = -1; | |
5476 | goto exit_init_data; | |
5477 | } | |
5478 | ret = snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 5479 | DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir); |
4a15001e MD |
5480 | if (ret < 0) { |
5481 | retval = -1; | |
5482 | goto exit_init_data; | |
5483 | } | |
67e40797 DG |
5484 | |
5485 | DBG2("Kernel consumer err path: %s", | |
5486 | kconsumer_data.err_unix_sock_path); | |
5487 | DBG2("Kernel consumer cmd path: %s", | |
5488 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 5489 | } else { |
feb0f3e5 | 5490 | home_path = utils_get_home_dir(); |
b082db07 | 5491 | if (home_path == NULL) { |
273ea72c DG |
5492 | /* TODO: Add --socket PATH option */ |
5493 | ERR("Can't get HOME directory for sockets creation."); | |
4a15001e MD |
5494 | retval = -1; |
5495 | goto exit_init_data; | |
b082db07 DG |
5496 | } |
5497 | ||
67e40797 DG |
5498 | /* |
5499 | * Create rundir from home path. This will create something like | |
5500 | * $HOME/.lttng | |
5501 | */ | |
990570ed | 5502 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
67e40797 | 5503 | if (ret < 0) { |
4a15001e MD |
5504 | retval = -1; |
5505 | goto exit_init_data; | |
67e40797 DG |
5506 | } |
5507 | ||
4a15001e MD |
5508 | if (create_lttng_rundir(rundir)) { |
5509 | retval = -1; | |
5510 | goto exit_init_data; | |
67e40797 DG |
5511 | } |
5512 | ||
fac6795d | 5513 | if (strlen(apps_unix_sock_path) == 0) { |
4a15001e MD |
5514 | ret = snprintf(apps_unix_sock_path, PATH_MAX, |
5515 | DEFAULT_HOME_APPS_UNIX_SOCK, | |
5516 | home_path); | |
5517 | if (ret < 0) { | |
5518 | retval = -1; | |
5519 | goto exit_init_data; | |
5520 | } | |
fac6795d DG |
5521 | } |
5522 | ||
5523 | /* Set the cli tool unix socket path */ | |
5524 | if (strlen(client_unix_sock_path) == 0) { | |
4a15001e MD |
5525 | ret = snprintf(client_unix_sock_path, PATH_MAX, |
5526 | DEFAULT_HOME_CLIENT_UNIX_SOCK, | |
5527 | home_path); | |
5528 | if (ret < 0) { | |
5529 | retval = -1; | |
5530 | goto exit_init_data; | |
5531 | } | |
fac6795d | 5532 | } |
0fdd1e2c DG |
5533 | |
5534 | /* Set global SHM for ust */ | |
5535 | if (strlen(wait_shm_path) == 0) { | |
4a15001e MD |
5536 | ret = snprintf(wait_shm_path, PATH_MAX, |
5537 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, | |
5538 | getuid()); | |
5539 | if (ret < 0) { | |
5540 | retval = -1; | |
5541 | goto exit_init_data; | |
5542 | } | |
0fdd1e2c | 5543 | } |
44a5e5eb DG |
5544 | |
5545 | /* Set health check Unix path */ | |
5546 | if (strlen(health_unix_sock_path) == 0) { | |
4a15001e MD |
5547 | ret = snprintf(health_unix_sock_path, |
5548 | sizeof(health_unix_sock_path), | |
5549 | DEFAULT_HOME_HEALTH_UNIX_SOCK, | |
5550 | home_path); | |
5551 | if (ret < 0) { | |
5552 | retval = -1; | |
5553 | goto exit_init_data; | |
5554 | } | |
44a5e5eb | 5555 | } |
fac6795d DG |
5556 | } |
5557 | ||
c9cb3e7d JG |
5558 | lockfile_fd = create_lockfile(); |
5559 | if (lockfile_fd < 0) { | |
4a15001e MD |
5560 | retval = -1; |
5561 | goto exit_init_data; | |
c9cb3e7d JG |
5562 | } |
5563 | ||
5c827ce0 DG |
5564 | /* Set consumer initial state */ |
5565 | kernel_consumerd_state = CONSUMER_STOPPED; | |
5566 | ust_consumerd_state = CONSUMER_STOPPED; | |
5567 | ||
847177cd DG |
5568 | DBG("Client socket path %s", client_unix_sock_path); |
5569 | DBG("Application socket path %s", apps_unix_sock_path); | |
d0b96690 | 5570 | DBG("Application wait path %s", wait_shm_path); |
67e40797 DG |
5571 | DBG("LTTng run directory path: %s", rundir); |
5572 | ||
5573 | /* 32 bits consumerd path setup */ | |
4a15001e | 5574 | ret = snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 5575 | DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir); |
4a15001e MD |
5576 | if (ret < 0) { |
5577 | PERROR("snprintf 32-bit consumer error socket path"); | |
5578 | retval = -1; | |
5579 | goto exit_init_data; | |
5580 | } | |
5581 | ret = snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 5582 | DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir); |
4a15001e MD |
5583 | if (ret < 0) { |
5584 | PERROR("snprintf 32-bit consumer command socket path"); | |
5585 | retval = -1; | |
5586 | goto exit_init_data; | |
5587 | } | |
67e40797 DG |
5588 | |
5589 | DBG2("UST consumer 32 bits err path: %s", | |
5590 | ustconsumer32_data.err_unix_sock_path); | |
5591 | DBG2("UST consumer 32 bits cmd path: %s", | |
5592 | ustconsumer32_data.cmd_unix_sock_path); | |
5593 | ||
5594 | /* 64 bits consumerd path setup */ | |
4a15001e | 5595 | ret = snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, |
60922cb0 | 5596 | DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir); |
4a15001e MD |
5597 | if (ret < 0) { |
5598 | PERROR("snprintf 64-bit consumer error socket path"); | |
5599 | retval = -1; | |
5600 | goto exit_init_data; | |
5601 | } | |
5602 | ret = snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, | |
60922cb0 | 5603 | DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir); |
4a15001e MD |
5604 | if (ret < 0) { |
5605 | PERROR("snprintf 64-bit consumer command socket path"); | |
5606 | retval = -1; | |
5607 | goto exit_init_data; | |
5608 | } | |
67e40797 DG |
5609 | |
5610 | DBG2("UST consumer 64 bits err path: %s", | |
5611 | ustconsumer64_data.err_unix_sock_path); | |
5612 | DBG2("UST consumer 64 bits cmd path: %s", | |
5613 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 5614 | |
273ea72c | 5615 | /* |
7d8234d9 | 5616 | * See if daemon already exist. |
fac6795d | 5617 | */ |
4a15001e | 5618 | if (check_existing_daemon()) { |
75462a81 | 5619 | ERR("Already running daemon.\n"); |
273ea72c | 5620 | /* |
cf3af59e MD |
5621 | * We do not goto exit because we must not cleanup() |
5622 | * because a daemon is already running. | |
ab118b20 | 5623 | */ |
4a15001e MD |
5624 | retval = -1; |
5625 | goto exit_init_data; | |
a88df331 DG |
5626 | } |
5627 | ||
1427f9b2 DG |
5628 | /* |
5629 | * Init UST app hash table. Alloc hash table before this point since | |
5630 | * cleanup() can get called after that point. | |
5631 | */ | |
4a15001e MD |
5632 | if (ust_app_ht_alloc()) { |
5633 | retval = -1; | |
5634 | goto exit_init_data; | |
5635 | } | |
1427f9b2 | 5636 | |
022d91ba | 5637 | /* Initialize agent domain subsystem. */ |
4a15001e | 5638 | if (agent_setup()) { |
f20baf8e | 5639 | /* ENOMEM at this point. */ |
4a15001e MD |
5640 | retval = -1; |
5641 | goto exit_init_data; | |
f20baf8e DG |
5642 | } |
5643 | ||
a88df331 DG |
5644 | /* |
5645 | * These actions must be executed as root. We do that *after* setting up | |
5646 | * the sockets path because we MUST make the check for another daemon using | |
5647 | * those paths *before* trying to set the kernel consumer sockets and init | |
5648 | * kernel tracer. | |
5649 | */ | |
5650 | if (is_root) { | |
4a15001e MD |
5651 | if (set_consumer_sockets(&kconsumer_data, rundir)) { |
5652 | retval = -1; | |
5653 | goto exit_init_data; | |
7753dea8 MD |
5654 | } |
5655 | ||
a88df331 | 5656 | /* Setup kernel tracer */ |
4fba7219 DG |
5657 | if (!opt_no_kernel) { |
5658 | init_kernel_tracer(); | |
89588270 DG |
5659 | if (kernel_tracer_fd >= 0) { |
5660 | ret = syscall_init_table(); | |
5661 | if (ret < 0) { | |
4a15001e MD |
5662 | ERR("Unable to populate syscall table. " |
5663 | "Syscall tracing won't work " | |
5664 | "for this session daemon."); | |
89588270 | 5665 | } |
834978fd | 5666 | } |
4fba7219 | 5667 | } |
a88df331 DG |
5668 | |
5669 | /* Set ulimit for open files */ | |
5670 | set_ulimit(); | |
fac6795d | 5671 | } |
4063050c MD |
5672 | /* init lttng_fd tracking must be done after set_ulimit. */ |
5673 | lttng_fd_init(); | |
fac6795d | 5674 | |
4a15001e MD |
5675 | if (set_consumer_sockets(&ustconsumer64_data, rundir)) { |
5676 | retval = -1; | |
5677 | goto exit_init_data; | |
67e40797 DG |
5678 | } |
5679 | ||
4a15001e MD |
5680 | if (set_consumer_sockets(&ustconsumer32_data, rundir)) { |
5681 | retval = -1; | |
5682 | goto exit_init_data; | |
67e40797 DG |
5683 | } |
5684 | ||
d6f42150 | 5685 | /* Setup the needed unix socket */ |
4a15001e MD |
5686 | if (init_daemon_socket()) { |
5687 | retval = -1; | |
5688 | goto exit_init_data; | |
fac6795d DG |
5689 | } |
5690 | ||
5691 | /* Set credentials to socket */ | |
4a15001e MD |
5692 | if (is_root && set_permissions(rundir)) { |
5693 | retval = -1; | |
5694 | goto exit_init_data; | |
fac6795d DG |
5695 | } |
5696 | ||
5b8719f5 DG |
5697 | /* Get parent pid if -S, --sig-parent is specified. */ |
5698 | if (opt_sig_parent) { | |
5699 | ppid = getppid(); | |
5700 | } | |
5701 | ||
7a485870 | 5702 | /* Setup the kernel pipe for waking up the kernel thread */ |
6620da75 | 5703 | if (is_root && !opt_no_kernel) { |
4a15001e MD |
5704 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
5705 | retval = -1; | |
5706 | goto exit_init_data; | |
6620da75 | 5707 | } |
7a485870 DG |
5708 | } |
5709 | ||
099e26bd | 5710 | /* Setup the thread apps communication pipe. */ |
4a15001e MD |
5711 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
5712 | retval = -1; | |
5713 | goto exit_init_data; | |
099e26bd DG |
5714 | } |
5715 | ||
d0b96690 | 5716 | /* Setup the thread apps notify communication pipe. */ |
4a15001e MD |
5717 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
5718 | retval = -1; | |
5719 | goto exit_init_data; | |
d0b96690 DG |
5720 | } |
5721 | ||
7972aab2 DG |
5722 | /* Initialize global buffer per UID and PID registry. */ |
5723 | buffer_reg_init_uid_registry(); | |
5724 | buffer_reg_init_pid_registry(); | |
5725 | ||
099e26bd | 5726 | /* Init UST command queue. */ |
8bdee6e2 | 5727 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
099e26bd | 5728 | |
273ea72c | 5729 | /* |
4a15001e MD |
5730 | * Get session list pointer. This pointer MUST NOT be free'd. This list |
5731 | * is statically declared in session.c | |
273ea72c | 5732 | */ |
54d01ffb | 5733 | session_list_ptr = session_get_list(); |
b5541356 | 5734 | |
2f77fc4b | 5735 | cmd_init(); |
00e2e675 | 5736 | |
ae9e45b3 DG |
5737 | /* Check for the application socket timeout env variable. */ |
5738 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); | |
5739 | if (env_app_timeout) { | |
5740 | app_socket_timeout = atoi(env_app_timeout); | |
5741 | } else { | |
5742 | app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; | |
5743 | } | |
5744 | ||
4a15001e MD |
5745 | ret = write_pidfile(); |
5746 | if (ret) { | |
5747 | ERR("Error in write_pidfile"); | |
5748 | retval = -1; | |
5749 | goto exit_init_data; | |
5750 | } | |
5751 | ret = write_agent_port(); | |
5752 | if (ret) { | |
5753 | ERR("Error in write_agent_port"); | |
5754 | retval = -1; | |
5755 | goto exit_init_data; | |
5756 | } | |
35f90c40 | 5757 | |
554831e7 MD |
5758 | /* Initialize communication library */ |
5759 | lttcomm_init(); | |
4a15001e | 5760 | /* Initialize TCP timeout values */ |
d831c249 | 5761 | lttcomm_inet_init(); |
554831e7 | 5762 | |
ef367a93 | 5763 | if (load_session_init_data(&load_info) < 0) { |
4a15001e MD |
5764 | retval = -1; |
5765 | goto exit_init_data; | |
ef367a93 JG |
5766 | } |
5767 | load_info->path = opt_load_session_path; | |
5768 | ||
d5b9fd2f | 5769 | /* Create health-check thread */ |
44a5e5eb DG |
5770 | ret = pthread_create(&health_thread, NULL, |
5771 | thread_manage_health, (void *) NULL); | |
4a15001e MD |
5772 | if (ret) { |
5773 | errno = ret; | |
44a5e5eb | 5774 | PERROR("pthread_create health"); |
4a15001e | 5775 | retval = -1; |
44a5e5eb DG |
5776 | goto exit_health; |
5777 | } | |
5778 | ||
cf3af59e | 5779 | /* Create thread to manage the client socket */ |
099e26bd DG |
5780 | ret = pthread_create(&client_thread, NULL, |
5781 | thread_manage_clients, (void *) NULL); | |
4a15001e MD |
5782 | if (ret) { |
5783 | errno = ret; | |
76d7553f | 5784 | PERROR("pthread_create clients"); |
4a15001e | 5785 | retval = -1; |
cf3af59e MD |
5786 | goto exit_client; |
5787 | } | |
fac6795d | 5788 | |
099e26bd DG |
5789 | /* Create thread to dispatch registration */ |
5790 | ret = pthread_create(&dispatch_thread, NULL, | |
5791 | thread_dispatch_ust_registration, (void *) NULL); | |
4a15001e MD |
5792 | if (ret) { |
5793 | errno = ret; | |
76d7553f | 5794 | PERROR("pthread_create dispatch"); |
4a15001e | 5795 | retval = -1; |
099e26bd DG |
5796 | goto exit_dispatch; |
5797 | } | |
5798 | ||
5799 | /* Create thread to manage application registration. */ | |
5800 | ret = pthread_create(®_apps_thread, NULL, | |
5801 | thread_registration_apps, (void *) NULL); | |
4a15001e MD |
5802 | if (ret) { |
5803 | errno = ret; | |
76d7553f | 5804 | PERROR("pthread_create registration"); |
4a15001e | 5805 | retval = -1; |
099e26bd DG |
5806 | goto exit_reg_apps; |
5807 | } | |
5808 | ||
cf3af59e | 5809 | /* Create thread to manage application socket */ |
54d01ffb DG |
5810 | ret = pthread_create(&apps_thread, NULL, |
5811 | thread_manage_apps, (void *) NULL); | |
4a15001e MD |
5812 | if (ret) { |
5813 | errno = ret; | |
d0b96690 | 5814 | PERROR("pthread_create apps"); |
4a15001e | 5815 | retval = -1; |
d0b96690 DG |
5816 | goto exit_apps; |
5817 | } | |
5818 | ||
5819 | /* Create thread to manage application notify socket */ | |
5820 | ret = pthread_create(&apps_notify_thread, NULL, | |
5821 | ust_thread_manage_notify, (void *) NULL); | |
4a15001e MD |
5822 | if (ret) { |
5823 | errno = ret; | |
f5c32ef1 | 5824 | PERROR("pthread_create notify"); |
4a15001e | 5825 | retval = -1; |
9563b0ad | 5826 | goto exit_apps_notify; |
cf3af59e | 5827 | } |
fac6795d | 5828 | |
022d91ba DG |
5829 | /* Create agent registration thread. */ |
5830 | ret = pthread_create(&agent_reg_thread, NULL, | |
5831 | agent_thread_manage_registration, (void *) NULL); | |
4a15001e MD |
5832 | if (ret) { |
5833 | errno = ret; | |
022d91ba | 5834 | PERROR("pthread_create agent"); |
4a15001e | 5835 | retval = -1; |
022d91ba | 5836 | goto exit_agent_reg; |
4d076222 DG |
5837 | } |
5838 | ||
6620da75 DG |
5839 | /* Don't start this thread if kernel tracing is not requested nor root */ |
5840 | if (is_root && !opt_no_kernel) { | |
5841 | /* Create kernel thread to manage kernel event */ | |
5842 | ret = pthread_create(&kernel_thread, NULL, | |
5843 | thread_manage_kernel, (void *) NULL); | |
4a15001e MD |
5844 | if (ret) { |
5845 | errno = ret; | |
6620da75 | 5846 | PERROR("pthread_create kernel"); |
4a15001e | 5847 | retval = -1; |
6620da75 DG |
5848 | goto exit_kernel; |
5849 | } | |
ef367a93 | 5850 | } |
7a485870 | 5851 | |
4a15001e MD |
5852 | /* Create session loading thread. */ |
5853 | ret = pthread_create(&load_session_thread, NULL, thread_load_session, | |
5854 | load_info); | |
5855 | if (ret) { | |
5856 | errno = ret; | |
5857 | PERROR("pthread_create load_session_thread"); | |
5858 | retval = -1; | |
5859 | goto exit_load_session; | |
5860 | } | |
5861 | ||
5862 | /* | |
5863 | * This is where we start awaiting program completion (e.g. through | |
5864 | * signal that asks threads to teardown). | |
5865 | */ | |
5866 | ||
5867 | ret = pthread_join(load_session_thread, &status); | |
5868 | if (ret) { | |
5869 | errno = ret; | |
5870 | PERROR("pthread_join load_session_thread"); | |
5871 | retval = -1; | |
5872 | } | |
5873 | exit_load_session: | |
ef367a93 JG |
5874 | |
5875 | if (is_root && !opt_no_kernel) { | |
6620da75 | 5876 | ret = pthread_join(kernel_thread, &status); |
4a15001e MD |
5877 | if (ret) { |
5878 | errno = ret; | |
6620da75 | 5879 | PERROR("pthread_join"); |
4a15001e | 5880 | retval = -1; |
6620da75 | 5881 | } |
fac6795d | 5882 | } |
cf3af59e | 5883 | exit_kernel: |
4a15001e | 5884 | |
022d91ba | 5885 | ret = pthread_join(agent_reg_thread, &status); |
4a15001e MD |
5886 | if (ret) { |
5887 | errno = ret; | |
022d91ba | 5888 | PERROR("pthread_join agent"); |
4a15001e | 5889 | retval = -1; |
4d076222 | 5890 | } |
022d91ba | 5891 | exit_agent_reg: |
4a15001e | 5892 | |
9563b0ad | 5893 | ret = pthread_join(apps_notify_thread, &status); |
4a15001e MD |
5894 | if (ret) { |
5895 | errno = ret; | |
9563b0ad | 5896 | PERROR("pthread_join apps notify"); |
4a15001e | 5897 | retval = -1; |
9563b0ad | 5898 | } |
9563b0ad | 5899 | exit_apps_notify: |
4a15001e | 5900 | |
cf3af59e | 5901 | ret = pthread_join(apps_thread, &status); |
4a15001e MD |
5902 | if (ret) { |
5903 | errno = ret; | |
9563b0ad | 5904 | PERROR("pthread_join apps"); |
4a15001e | 5905 | retval = -1; |
cf3af59e | 5906 | } |
cf3af59e | 5907 | exit_apps: |
4a15001e | 5908 | |
099e26bd | 5909 | ret = pthread_join(reg_apps_thread, &status); |
4a15001e MD |
5910 | if (ret) { |
5911 | errno = ret; | |
76d7553f | 5912 | PERROR("pthread_join"); |
4a15001e | 5913 | retval = -1; |
099e26bd | 5914 | } |
099e26bd | 5915 | exit_reg_apps: |
4a15001e | 5916 | |
099e26bd | 5917 | ret = pthread_join(dispatch_thread, &status); |
4a15001e MD |
5918 | if (ret) { |
5919 | errno = ret; | |
76d7553f | 5920 | PERROR("pthread_join"); |
4a15001e | 5921 | retval = -1; |
099e26bd | 5922 | } |
099e26bd | 5923 | exit_dispatch: |
4a15001e | 5924 | |
cf3af59e | 5925 | ret = pthread_join(client_thread, &status); |
4a15001e MD |
5926 | if (ret) { |
5927 | errno = ret; | |
76d7553f | 5928 | PERROR("pthread_join"); |
4a15001e | 5929 | retval = -1; |
cf3af59e | 5930 | } |
4a15001e | 5931 | exit_client: |
a88df331 | 5932 | |
4a15001e MD |
5933 | ret = pthread_join(health_thread, &status); |
5934 | if (ret) { | |
5935 | errno = ret; | |
5936 | PERROR("pthread_join health thread"); | |
5937 | retval = -1; | |
06f525de | 5938 | } |
4a15001e | 5939 | exit_health: |
06f525de | 5940 | |
4a15001e MD |
5941 | exit_init_data: |
5942 | /* | |
5943 | * sessiond_cleanup() is called when no other thread is running, except | |
5944 | * the ht_cleanup thread, which is needed to destroy the hash tables. | |
5945 | */ | |
5946 | rcu_thread_online(); | |
5947 | sessiond_cleanup(); | |
5948 | rcu_thread_offline(); | |
5949 | rcu_unregister_thread(); | |
06f525de | 5950 | |
4a15001e MD |
5951 | ret = notify_thread_pipe(ht_cleanup_quit_pipe[1]); |
5952 | if (ret < 0) { | |
5953 | ERR("write error on ht_cleanup quit pipe"); | |
5954 | retval = -1; | |
06f525de DG |
5955 | } |
5956 | ||
0b2dc8df | 5957 | ret = pthread_join(ht_cleanup_thread, &status); |
4a15001e MD |
5958 | if (ret) { |
5959 | errno = ret; | |
0b2dc8df | 5960 | PERROR("pthread_join ht cleanup thread"); |
4a15001e | 5961 | retval = -1; |
0b2dc8df MD |
5962 | } |
5963 | exit_ht_cleanup: | |
25b397f9 | 5964 | exit_set_max_size: |
4a15001e MD |
5965 | |
5966 | utils_close_pipe(ht_cleanup_pipe); | |
5967 | exit_ht_cleanup_pipe: | |
5968 | ||
cf3af59e | 5969 | /* |
4a15001e | 5970 | * Close the ht_cleanup quit pipe. |
cf3af59e | 5971 | */ |
4a15001e MD |
5972 | utils_close_pipe(ht_cleanup_quit_pipe); |
5973 | exit_ht_cleanup_quit_pipe: | |
5974 | ||
5975 | health_app_destroy(health_sessiond); | |
5976 | exit_health_sessiond_cleanup: | |
5977 | ||
5978 | exit_options: | |
5979 | sessiond_cleanup_options(); | |
5980 | ||
5981 | exit_set_signal_handler: | |
5982 | if (!retval) { | |
cf3af59e | 5983 | exit(EXIT_SUCCESS); |
4a15001e MD |
5984 | } else { |
5985 | exit(EXIT_FAILURE); | |
67e40797 | 5986 | } |
fac6795d | 5987 | } |