Commit | Line | Data |
---|---|---|
2691221a MD |
1 | /* |
2 | * lttng-ust-comm.c | |
3 | * | |
4 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> | |
5 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
6 | * | |
7 | * This library is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; only | |
10 | * version 2.1 of the License. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with this library; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
80e2814b | 22 | #define _LGPL_SOURCE |
2691221a MD |
23 | #include <sys/types.h> |
24 | #include <sys/socket.h> | |
7fc90dca MD |
25 | #include <sys/mman.h> |
26 | #include <sys/stat.h> | |
58d4b2a2 MD |
27 | #include <sys/types.h> |
28 | #include <sys/wait.h> | |
7fc90dca | 29 | #include <fcntl.h> |
2691221a MD |
30 | #include <unistd.h> |
31 | #include <errno.h> | |
d9e99d10 | 32 | #include <pthread.h> |
11ff9c7d MD |
33 | #include <semaphore.h> |
34 | #include <time.h> | |
1ea11eab | 35 | #include <assert.h> |
e822f505 | 36 | #include <signal.h> |
95c25348 | 37 | #include <dlfcn.h> |
95259bd0 | 38 | #include <urcu/uatomic.h> |
80e2814b | 39 | #include <urcu/futex.h> |
c117fb1b | 40 | #include <urcu/compiler.h> |
1ea11eab | 41 | |
4318ae1b | 42 | #include <lttng/ust-events.h> |
4318ae1b | 43 | #include <lttng/ust-abi.h> |
4318ae1b | 44 | #include <lttng/ust.h> |
7bc53e94 | 45 | #include <lttng/ust-error.h> |
74d81a6c | 46 | #include <lttng/ust-ctl.h> |
8c90a710 | 47 | #include <urcu/tls-compat.h> |
44c72f10 MD |
48 | #include <ust-comm.h> |
49 | #include <usterr-signal-safe.h> | |
cd54f6d9 | 50 | #include <helper.h> |
44c72f10 | 51 | #include "tracepoint-internal.h" |
7dd08bec | 52 | #include "lttng-tracer-core.h" |
08114193 | 53 | #include "compat.h" |
f645cfa7 | 54 | #include "../libringbuffer/tlsfixup.h" |
394598c1 | 55 | #include "lttng-ust-baddr.h" |
edaa1431 MD |
56 | |
57 | /* | |
58 | * Has lttng ust comm constructor been called ? | |
59 | */ | |
60 | static int initialized; | |
61 | ||
1ea11eab | 62 | /* |
17dfb34b MD |
63 | * The ust_lock/ust_unlock lock is used as a communication thread mutex. |
64 | * Held when handling a command, also held by fork() to deal with | |
65 | * removal of threads, and by exit path. | |
1ea11eab | 66 | */ |
1ea11eab MD |
67 | |
68 | /* Should the ust comm thread quit ? */ | |
69 | static int lttng_ust_comm_should_quit; | |
70 | ||
11ff9c7d MD |
71 | /* |
72 | * Wait for either of these before continuing to the main | |
73 | * program: | |
74 | * - the register_done message from sessiond daemon | |
75 | * (will let the sessiond daemon enable sessions before main | |
76 | * starts.) | |
77 | * - sessiond daemon is not reachable. | |
78 | * - timeout (ensuring applications are resilient to session | |
79 | * daemon problems). | |
80 | */ | |
81 | static sem_t constructor_wait; | |
950aab0c MD |
82 | /* |
83 | * Doing this for both the global and local sessiond. | |
84 | */ | |
95259bd0 | 85 | static int sem_count = { 2 }; |
11ff9c7d | 86 | |
e8508a49 MD |
87 | /* |
88 | * Counting nesting within lttng-ust. Used to ensure that calling fork() | |
89 | * from liblttng-ust does not execute the pre/post fork handlers. | |
90 | */ | |
8c90a710 | 91 | static DEFINE_URCU_TLS(int, lttng_ust_nest_count); |
e8508a49 | 92 | |
1ea11eab MD |
93 | /* |
94 | * Info about socket and associated listener thread. | |
95 | */ | |
96 | struct sock_info { | |
11ff9c7d | 97 | const char *name; |
1ea11eab | 98 | pthread_t ust_listener; /* listener thread */ |
46050b1a | 99 | int root_handle; |
8d20bf54 MD |
100 | int constructor_sem_posted; |
101 | int allowed; | |
44e073f5 | 102 | int global; |
e33f3265 | 103 | int thread_active; |
7fc90dca MD |
104 | |
105 | char sock_path[PATH_MAX]; | |
106 | int socket; | |
32ce8569 | 107 | int notify_socket; |
7fc90dca MD |
108 | |
109 | char wait_shm_path[PATH_MAX]; | |
110 | char *wait_shm_mmap; | |
37dddb65 MD |
111 | /* Keep track of lazy state dump not performed yet. */ |
112 | int statedump_pending; | |
1ea11eab | 113 | }; |
2691221a MD |
114 | |
115 | /* Socket from app (connect) to session daemon (listen) for communication */ | |
1ea11eab | 116 | struct sock_info global_apps = { |
11ff9c7d | 117 | .name = "global", |
44e073f5 | 118 | .global = 1, |
7fc90dca | 119 | |
46050b1a | 120 | .root_handle = -1, |
8d20bf54 | 121 | .allowed = 1, |
e33f3265 | 122 | .thread_active = 0, |
7fc90dca | 123 | |
32ce8569 | 124 | .sock_path = LTTNG_DEFAULT_RUNDIR "/" LTTNG_UST_SOCK_FILENAME, |
7fc90dca | 125 | .socket = -1, |
32ce8569 | 126 | .notify_socket = -1, |
7fc90dca | 127 | |
32ce8569 | 128 | .wait_shm_path = "/" LTTNG_UST_WAIT_FILENAME, |
95c25348 | 129 | |
37dddb65 | 130 | .statedump_pending = 0, |
1ea11eab | 131 | }; |
2691221a MD |
132 | |
133 | /* TODO: allow global_apps_sock_path override */ | |
134 | ||
1ea11eab | 135 | struct sock_info local_apps = { |
11ff9c7d | 136 | .name = "local", |
44e073f5 | 137 | .global = 0, |
46050b1a | 138 | .root_handle = -1, |
8d20bf54 | 139 | .allowed = 0, /* Check setuid bit first */ |
e33f3265 | 140 | .thread_active = 0, |
7fc90dca MD |
141 | |
142 | .socket = -1, | |
32ce8569 | 143 | .notify_socket = -1, |
95c25348 | 144 | |
37dddb65 | 145 | .statedump_pending = 0, |
1ea11eab | 146 | }; |
2691221a | 147 | |
37ed587a MD |
148 | static int wait_poll_fallback; |
149 | ||
74d81a6c MD |
150 | static const char *cmd_name_mapping[] = { |
151 | [ LTTNG_UST_RELEASE ] = "Release", | |
152 | [ LTTNG_UST_SESSION ] = "Create Session", | |
153 | [ LTTNG_UST_TRACER_VERSION ] = "Get Tracer Version", | |
154 | ||
155 | [ LTTNG_UST_TRACEPOINT_LIST ] = "Create Tracepoint List", | |
156 | [ LTTNG_UST_WAIT_QUIESCENT ] = "Wait for Quiescent State", | |
157 | [ LTTNG_UST_REGISTER_DONE ] = "Registration Done", | |
158 | [ LTTNG_UST_TRACEPOINT_FIELD_LIST ] = "Create Tracepoint Field List", | |
159 | ||
160 | /* Session FD commands */ | |
161 | [ LTTNG_UST_CHANNEL ] = "Create Channel", | |
162 | [ LTTNG_UST_SESSION_START ] = "Start Session", | |
163 | [ LTTNG_UST_SESSION_STOP ] = "Stop Session", | |
164 | ||
165 | /* Channel FD commands */ | |
166 | [ LTTNG_UST_STREAM ] = "Create Stream", | |
167 | [ LTTNG_UST_EVENT ] = "Create Event", | |
168 | ||
169 | /* Event and Channel FD commands */ | |
170 | [ LTTNG_UST_CONTEXT ] = "Create Context", | |
171 | [ LTTNG_UST_FLUSH_BUFFER ] = "Flush Buffer", | |
172 | ||
173 | /* Event, Channel and Session commands */ | |
174 | [ LTTNG_UST_ENABLE ] = "Enable", | |
175 | [ LTTNG_UST_DISABLE ] = "Disable", | |
176 | ||
177 | /* Tracepoint list commands */ | |
178 | [ LTTNG_UST_TRACEPOINT_LIST_GET ] = "List Next Tracepoint", | |
179 | [ LTTNG_UST_TRACEPOINT_FIELD_LIST_GET ] = "List Next Tracepoint Field", | |
180 | ||
181 | /* Event FD commands */ | |
182 | [ LTTNG_UST_FILTER ] = "Create Filter", | |
75582b3a | 183 | [ LTTNG_UST_EXCLUSION ] = "Add exclusions to event", |
74d81a6c MD |
184 | }; |
185 | ||
ff517991 MD |
186 | static const char *str_timeout; |
187 | static int got_timeout_env; | |
188 | ||
7dd08bec | 189 | extern void lttng_ring_buffer_client_overwrite_init(void); |
34a91bdb | 190 | extern void lttng_ring_buffer_client_overwrite_rt_init(void); |
7dd08bec | 191 | extern void lttng_ring_buffer_client_discard_init(void); |
34a91bdb | 192 | extern void lttng_ring_buffer_client_discard_rt_init(void); |
7dd08bec MD |
193 | extern void lttng_ring_buffer_metadata_client_init(void); |
194 | extern void lttng_ring_buffer_client_overwrite_exit(void); | |
34a91bdb | 195 | extern void lttng_ring_buffer_client_overwrite_rt_exit(void); |
7dd08bec | 196 | extern void lttng_ring_buffer_client_discard_exit(void); |
34a91bdb | 197 | extern void lttng_ring_buffer_client_discard_rt_exit(void); |
7dd08bec | 198 | extern void lttng_ring_buffer_metadata_client_exit(void); |
edaa1431 | 199 | |
3c6f6263 AM |
200 | /* |
201 | * Returns the HOME directory path. Caller MUST NOT free(3) the returned | |
202 | * pointer. | |
203 | */ | |
204 | static | |
205 | const char *get_lttng_home_dir(void) | |
206 | { | |
207 | const char *val; | |
208 | ||
209 | val = (const char *) getenv("LTTNG_HOME"); | |
210 | if (val != NULL) { | |
211 | return val; | |
212 | } | |
213 | return (const char *) getenv("HOME"); | |
214 | } | |
215 | ||
a903623f MD |
216 | /* |
217 | * Force a read (imply TLS fixup for dlopen) of TLS variables. | |
218 | */ | |
219 | static | |
220 | void lttng_fixup_nest_count_tls(void) | |
221 | { | |
8c90a710 | 222 | asm volatile ("" : : "m" (URCU_TLS(lttng_ust_nest_count))); |
a903623f MD |
223 | } |
224 | ||
32ce8569 MD |
225 | int lttng_get_notify_socket(void *owner) |
226 | { | |
227 | struct sock_info *info = owner; | |
228 | ||
229 | return info->notify_socket; | |
230 | } | |
231 | ||
74d81a6c MD |
232 | static |
233 | void print_cmd(int cmd, int handle) | |
234 | { | |
235 | const char *cmd_name = "Unknown"; | |
236 | ||
fd67a004 MD |
237 | if (cmd >= 0 && cmd < LTTNG_ARRAY_SIZE(cmd_name_mapping) |
238 | && cmd_name_mapping[cmd]) { | |
74d81a6c MD |
239 | cmd_name = cmd_name_mapping[cmd]; |
240 | } | |
fd67a004 MD |
241 | DBG("Message Received \"%s\" (%d), Handle \"%s\" (%d)", |
242 | cmd_name, cmd, | |
74d81a6c MD |
243 | lttng_ust_obj_get_name(handle), handle); |
244 | } | |
245 | ||
2691221a | 246 | static |
8d20bf54 | 247 | int setup_local_apps(void) |
2691221a MD |
248 | { |
249 | const char *home_dir; | |
7fc90dca | 250 | uid_t uid; |
2691221a | 251 | |
7fc90dca | 252 | uid = getuid(); |
8d20bf54 MD |
253 | /* |
254 | * Disallow per-user tracing for setuid binaries. | |
255 | */ | |
7fc90dca | 256 | if (uid != geteuid()) { |
9ec6895c | 257 | assert(local_apps.allowed == 0); |
d0a1ae63 | 258 | return 0; |
8d20bf54 | 259 | } |
3c6f6263 | 260 | home_dir = get_lttng_home_dir(); |
9ec6895c MD |
261 | if (!home_dir) { |
262 | WARN("HOME environment variable not set. Disabling LTTng-UST per-user tracing."); | |
263 | assert(local_apps.allowed == 0); | |
2691221a | 264 | return -ENOENT; |
9ec6895c MD |
265 | } |
266 | local_apps.allowed = 1; | |
32ce8569 MD |
267 | snprintf(local_apps.sock_path, PATH_MAX, "%s/%s/%s", |
268 | home_dir, | |
269 | LTTNG_DEFAULT_HOME_RUNDIR, | |
270 | LTTNG_UST_SOCK_FILENAME); | |
271 | snprintf(local_apps.wait_shm_path, PATH_MAX, "/%s-%u", | |
272 | LTTNG_UST_WAIT_FILENAME, | |
273 | uid); | |
2691221a MD |
274 | return 0; |
275 | } | |
276 | ||
ff517991 MD |
277 | /* |
278 | * Get notify_sock timeout, in ms. | |
279 | * -1: don't wait. 0: wait forever. >0: timeout, in ms. | |
280 | */ | |
281 | static | |
282 | long get_timeout(void) | |
283 | { | |
284 | long constructor_delay_ms = LTTNG_UST_DEFAULT_CONSTRUCTOR_TIMEOUT_MS; | |
285 | ||
286 | if (!got_timeout_env) { | |
287 | str_timeout = getenv("LTTNG_UST_REGISTER_TIMEOUT"); | |
288 | got_timeout_env = 1; | |
289 | } | |
290 | if (str_timeout) | |
291 | constructor_delay_ms = strtol(str_timeout, NULL, 10); | |
292 | return constructor_delay_ms; | |
293 | } | |
294 | ||
295 | static | |
296 | long get_notify_sock_timeout(void) | |
297 | { | |
298 | return get_timeout(); | |
299 | } | |
300 | ||
301 | /* | |
302 | * Return values: -1: don't wait. 0: wait forever. 1: timeout wait. | |
303 | */ | |
304 | static | |
305 | int get_constructor_timeout(struct timespec *constructor_timeout) | |
306 | { | |
307 | long constructor_delay_ms; | |
308 | int ret; | |
309 | ||
310 | constructor_delay_ms = get_timeout(); | |
311 | ||
312 | switch (constructor_delay_ms) { | |
313 | case -1:/* fall-through */ | |
314 | case 0: | |
315 | return constructor_delay_ms; | |
316 | default: | |
317 | break; | |
318 | } | |
319 | ||
320 | /* | |
321 | * If we are unable to find the current time, don't wait. | |
322 | */ | |
323 | ret = clock_gettime(CLOCK_REALTIME, constructor_timeout); | |
324 | if (ret) { | |
325 | return -1; | |
326 | } | |
327 | constructor_timeout->tv_sec += constructor_delay_ms / 1000UL; | |
328 | constructor_timeout->tv_nsec += | |
329 | (constructor_delay_ms % 1000UL) * 1000000UL; | |
330 | if (constructor_timeout->tv_nsec >= 1000000000UL) { | |
331 | constructor_timeout->tv_sec++; | |
332 | constructor_timeout->tv_nsec -= 1000000000UL; | |
333 | } | |
334 | return 1; | |
335 | } | |
336 | ||
2691221a | 337 | static |
32ce8569 | 338 | int register_to_sessiond(int socket, enum ustctl_socket_type type) |
2691221a | 339 | { |
32ce8569 MD |
340 | return ustcomm_send_reg_msg(socket, |
341 | type, | |
342 | CAA_BITS_PER_LONG, | |
343 | lttng_alignof(uint8_t) * CHAR_BIT, | |
344 | lttng_alignof(uint16_t) * CHAR_BIT, | |
345 | lttng_alignof(uint32_t) * CHAR_BIT, | |
346 | lttng_alignof(uint64_t) * CHAR_BIT, | |
347 | lttng_alignof(unsigned long) * CHAR_BIT); | |
2691221a MD |
348 | } |
349 | ||
d9e99d10 | 350 | static |
57773204 | 351 | int send_reply(int sock, struct ustcomm_ust_reply *lur) |
d9e99d10 | 352 | { |
9eb62b9c | 353 | ssize_t len; |
d3a492d1 | 354 | |
57773204 | 355 | len = ustcomm_send_unix_sock(sock, lur, sizeof(*lur)); |
d3a492d1 | 356 | switch (len) { |
a4be8962 | 357 | case sizeof(*lur): |
d3a492d1 MD |
358 | DBG("message successfully sent"); |
359 | return 0; | |
7bc53e94 MD |
360 | default: |
361 | if (len == -ECONNRESET) { | |
362 | DBG("remote end closed connection"); | |
d3a492d1 MD |
363 | return 0; |
364 | } | |
7bc53e94 MD |
365 | if (len < 0) |
366 | return len; | |
367 | DBG("incorrect message size: %zd", len); | |
368 | return -EINVAL; | |
d3a492d1 MD |
369 | } |
370 | } | |
371 | ||
372 | static | |
edaa1431 | 373 | int handle_register_done(struct sock_info *sock_info) |
11ff9c7d MD |
374 | { |
375 | int ret; | |
376 | ||
edaa1431 MD |
377 | if (sock_info->constructor_sem_posted) |
378 | return 0; | |
379 | sock_info->constructor_sem_posted = 1; | |
56cd7e2f MD |
380 | if (uatomic_read(&sem_count) <= 0) { |
381 | return 0; | |
382 | } | |
95259bd0 MD |
383 | ret = uatomic_add_return(&sem_count, -1); |
384 | if (ret == 0) { | |
385 | ret = sem_post(&constructor_wait); | |
386 | assert(!ret); | |
387 | } | |
11ff9c7d MD |
388 | return 0; |
389 | } | |
390 | ||
37dddb65 MD |
391 | /* |
392 | * Only execute pending statedump after the constructor semaphore has | |
393 | * been posted by each listener thread. This means statedump will only | |
394 | * be performed after the "registration done" command is received from | |
395 | * each session daemon the application is connected to. | |
396 | * | |
397 | * This ensures we don't run into deadlock issues with the dynamic | |
398 | * loader mutex, which is held while the constructor is called and | |
399 | * waiting on the constructor semaphore. All operations requiring this | |
400 | * dynamic loader lock need to be postponed using this mechanism. | |
401 | */ | |
402 | static | |
403 | void handle_pending_statedump(struct sock_info *sock_info) | |
404 | { | |
405 | int ctor_passed = sock_info->constructor_sem_posted; | |
406 | ||
407 | if (ctor_passed && sock_info->statedump_pending) { | |
408 | sock_info->statedump_pending = 0; | |
409 | lttng_handle_pending_statedump(sock_info); | |
410 | } | |
411 | } | |
412 | ||
11ff9c7d MD |
413 | static |
414 | int handle_message(struct sock_info *sock_info, | |
57773204 | 415 | int sock, struct ustcomm_ust_msg *lum) |
d3a492d1 | 416 | { |
1ea11eab | 417 | int ret = 0; |
b61ce3b2 | 418 | const struct lttng_ust_objd_ops *ops; |
57773204 | 419 | struct ustcomm_ust_reply lur; |
ef9ff354 | 420 | union ust_args args; |
40003310 | 421 | ssize_t len; |
1ea11eab | 422 | |
17dfb34b | 423 | ust_lock(); |
1ea11eab | 424 | |
46050b1a MD |
425 | memset(&lur, 0, sizeof(lur)); |
426 | ||
1ea11eab | 427 | if (lttng_ust_comm_should_quit) { |
74d81a6c | 428 | ret = -LTTNG_UST_ERR_EXITING; |
1ea11eab MD |
429 | goto end; |
430 | } | |
9eb62b9c | 431 | |
46050b1a MD |
432 | ops = objd_ops(lum->handle); |
433 | if (!ops) { | |
434 | ret = -ENOENT; | |
435 | goto end; | |
1ea11eab | 436 | } |
46050b1a MD |
437 | |
438 | switch (lum->cmd) { | |
11ff9c7d MD |
439 | case LTTNG_UST_REGISTER_DONE: |
440 | if (lum->handle == LTTNG_UST_ROOT_HANDLE) | |
edaa1431 | 441 | ret = handle_register_done(sock_info); |
11ff9c7d MD |
442 | else |
443 | ret = -EINVAL; | |
444 | break; | |
46050b1a MD |
445 | case LTTNG_UST_RELEASE: |
446 | if (lum->handle == LTTNG_UST_ROOT_HANDLE) | |
447 | ret = -EPERM; | |
448 | else | |
1849ef7c | 449 | ret = lttng_ust_objd_unref(lum->handle, 1); |
d9e99d10 | 450 | break; |
2d78951a MD |
451 | case LTTNG_UST_FILTER: |
452 | { | |
453 | /* Receive filter data */ | |
f488575f | 454 | struct lttng_ust_filter_bytecode_node *bytecode; |
2d78951a | 455 | |
cd54f6d9 | 456 | if (lum->u.filter.data_size > FILTER_BYTECODE_MAX_LEN) { |
7bc53e94 | 457 | ERR("Filter data size is too large: %u bytes", |
2d78951a MD |
458 | lum->u.filter.data_size); |
459 | ret = -EINVAL; | |
460 | goto error; | |
461 | } | |
2734ca65 | 462 | |
885b1dfd | 463 | if (lum->u.filter.reloc_offset > lum->u.filter.data_size) { |
7bc53e94 | 464 | ERR("Filter reloc offset %u is not within data", |
2734ca65 CB |
465 | lum->u.filter.reloc_offset); |
466 | ret = -EINVAL; | |
467 | goto error; | |
468 | } | |
469 | ||
cd54f6d9 MD |
470 | bytecode = zmalloc(sizeof(*bytecode) + lum->u.filter.data_size); |
471 | if (!bytecode) { | |
472 | ret = -ENOMEM; | |
473 | goto error; | |
474 | } | |
f488575f | 475 | len = ustcomm_recv_unix_sock(sock, bytecode->bc.data, |
2d78951a MD |
476 | lum->u.filter.data_size); |
477 | switch (len) { | |
478 | case 0: /* orderly shutdown */ | |
479 | ret = 0; | |
cd54f6d9 | 480 | free(bytecode); |
2d78951a | 481 | goto error; |
2d78951a MD |
482 | default: |
483 | if (len == lum->u.filter.data_size) { | |
7bc53e94 | 484 | DBG("filter data received"); |
2d78951a | 485 | break; |
7bc53e94 MD |
486 | } else if (len < 0) { |
487 | DBG("Receive failed from lttng-sessiond with errno %d", (int) -len); | |
488 | if (len == -ECONNRESET) { | |
489 | ERR("%s remote end closed connection", sock_info->name); | |
490 | ret = len; | |
491 | free(bytecode); | |
492 | goto error; | |
493 | } | |
494 | ret = len; | |
eb8bf361 | 495 | free(bytecode); |
7bc53e94 | 496 | goto end; |
2d78951a | 497 | } else { |
7bc53e94 | 498 | DBG("incorrect filter data message size: %zd", len); |
2d78951a | 499 | ret = -EINVAL; |
cd54f6d9 | 500 | free(bytecode); |
2d78951a MD |
501 | goto end; |
502 | } | |
503 | } | |
f488575f MD |
504 | bytecode->bc.len = lum->u.filter.data_size; |
505 | bytecode->bc.reloc_offset = lum->u.filter.reloc_offset; | |
3f6fd224 | 506 | bytecode->bc.seqnum = lum->u.filter.seqnum; |
cd54f6d9 | 507 | if (ops->cmd) { |
2d78951a | 508 | ret = ops->cmd(lum->handle, lum->cmd, |
cd54f6d9 | 509 | (unsigned long) bytecode, |
f59ed768 | 510 | &args, sock_info); |
cd54f6d9 MD |
511 | if (ret) { |
512 | free(bytecode); | |
513 | } | |
514 | /* don't free bytecode if everything went fine. */ | |
515 | } else { | |
2d78951a | 516 | ret = -ENOSYS; |
cd54f6d9 MD |
517 | free(bytecode); |
518 | } | |
2d78951a MD |
519 | break; |
520 | } | |
86e36163 JI |
521 | case LTTNG_UST_EXCLUSION: |
522 | { | |
523 | /* Receive exclusion names */ | |
524 | struct lttng_ust_excluder_node *node; | |
525 | unsigned int count; | |
526 | ||
527 | count = lum->u.exclusion.count; | |
528 | if (count == 0) { | |
529 | /* There are no names to read */ | |
530 | ret = 0; | |
531 | goto error; | |
532 | } | |
533 | node = zmalloc(sizeof(*node) + | |
534 | count * LTTNG_UST_SYM_NAME_LEN); | |
535 | if (!node) { | |
536 | ret = -ENOMEM; | |
537 | goto error; | |
538 | } | |
539 | node->excluder.count = count; | |
540 | len = ustcomm_recv_unix_sock(sock, node->excluder.names, | |
541 | count * LTTNG_UST_SYM_NAME_LEN); | |
542 | switch (len) { | |
543 | case 0: /* orderly shutdown */ | |
544 | ret = 0; | |
545 | free(node); | |
546 | goto error; | |
547 | default: | |
548 | if (len == count * LTTNG_UST_SYM_NAME_LEN) { | |
549 | DBG("Exclusion data received"); | |
550 | break; | |
551 | } else if (len < 0) { | |
552 | DBG("Receive failed from lttng-sessiond with errno %d", (int) -len); | |
553 | if (len == -ECONNRESET) { | |
554 | ERR("%s remote end closed connection", sock_info->name); | |
555 | ret = len; | |
556 | free(node); | |
557 | goto error; | |
558 | } | |
559 | ret = len; | |
560 | free(node); | |
561 | goto end; | |
562 | } else { | |
563 | DBG("Incorrect exclusion data message size: %zd", len); | |
564 | ret = -EINVAL; | |
565 | free(node); | |
566 | goto end; | |
567 | } | |
568 | } | |
569 | if (ops->cmd) { | |
570 | ret = ops->cmd(lum->handle, lum->cmd, | |
571 | (unsigned long) node, | |
572 | &args, sock_info); | |
573 | if (ret) { | |
574 | free(node); | |
575 | } | |
576 | /* Don't free exclusion data if everything went fine. */ | |
577 | } else { | |
578 | ret = -ENOSYS; | |
579 | free(node); | |
580 | } | |
581 | break; | |
582 | } | |
74d81a6c MD |
583 | case LTTNG_UST_CHANNEL: |
584 | { | |
585 | void *chan_data; | |
ff0f5728 | 586 | int wakeup_fd; |
74d81a6c MD |
587 | |
588 | len = ustcomm_recv_channel_from_sessiond(sock, | |
ff0f5728 MD |
589 | &chan_data, lum->u.channel.len, |
590 | &wakeup_fd); | |
74d81a6c MD |
591 | switch (len) { |
592 | case 0: /* orderly shutdown */ | |
593 | ret = 0; | |
594 | goto error; | |
595 | default: | |
596 | if (len == lum->u.channel.len) { | |
597 | DBG("channel data received"); | |
598 | break; | |
599 | } else if (len < 0) { | |
600 | DBG("Receive failed from lttng-sessiond with errno %d", (int) -len); | |
601 | if (len == -ECONNRESET) { | |
602 | ERR("%s remote end closed connection", sock_info->name); | |
603 | ret = len; | |
604 | goto error; | |
605 | } | |
606 | ret = len; | |
607 | goto end; | |
608 | } else { | |
609 | DBG("incorrect channel data message size: %zd", len); | |
610 | ret = -EINVAL; | |
611 | goto end; | |
612 | } | |
613 | } | |
614 | args.channel.chan_data = chan_data; | |
ff0f5728 | 615 | args.channel.wakeup_fd = wakeup_fd; |
74d81a6c MD |
616 | if (ops->cmd) |
617 | ret = ops->cmd(lum->handle, lum->cmd, | |
618 | (unsigned long) &lum->u, | |
619 | &args, sock_info); | |
620 | else | |
621 | ret = -ENOSYS; | |
622 | break; | |
623 | } | |
624 | case LTTNG_UST_STREAM: | |
625 | { | |
626 | /* Receive shm_fd, wakeup_fd */ | |
627 | ret = ustcomm_recv_stream_from_sessiond(sock, | |
628 | &lum->u.stream.len, | |
629 | &args.stream.shm_fd, | |
630 | &args.stream.wakeup_fd); | |
631 | if (ret) { | |
632 | goto end; | |
633 | } | |
634 | if (ops->cmd) | |
635 | ret = ops->cmd(lum->handle, lum->cmd, | |
636 | (unsigned long) &lum->u, | |
637 | &args, sock_info); | |
638 | else | |
639 | ret = -ENOSYS; | |
640 | break; | |
641 | } | |
d9e99d10 | 642 | default: |
46050b1a MD |
643 | if (ops->cmd) |
644 | ret = ops->cmd(lum->handle, lum->cmd, | |
ef9ff354 | 645 | (unsigned long) &lum->u, |
f59ed768 | 646 | &args, sock_info); |
46050b1a MD |
647 | else |
648 | ret = -ENOSYS; | |
649 | break; | |
d9e99d10 | 650 | } |
46050b1a | 651 | |
1ea11eab | 652 | end: |
46050b1a MD |
653 | lur.handle = lum->handle; |
654 | lur.cmd = lum->cmd; | |
655 | lur.ret_val = ret; | |
656 | if (ret >= 0) { | |
7bc53e94 | 657 | lur.ret_code = LTTNG_UST_OK; |
46050b1a | 658 | } else { |
7bc53e94 MD |
659 | /* |
660 | * Use -LTTNG_UST_ERR as wildcard for UST internal | |
661 | * error that are not caused by the transport, except if | |
662 | * we already have a more precise error message to | |
663 | * report. | |
664 | */ | |
64b2564e DG |
665 | if (ret > -LTTNG_UST_ERR) { |
666 | /* Translate code to UST error. */ | |
667 | switch (ret) { | |
668 | case -EEXIST: | |
669 | lur.ret_code = -LTTNG_UST_ERR_EXIST; | |
670 | break; | |
671 | case -EINVAL: | |
672 | lur.ret_code = -LTTNG_UST_ERR_INVAL; | |
673 | break; | |
674 | case -ENOENT: | |
675 | lur.ret_code = -LTTNG_UST_ERR_NOENT; | |
676 | break; | |
677 | case -EPERM: | |
678 | lur.ret_code = -LTTNG_UST_ERR_PERM; | |
679 | break; | |
680 | case -ENOSYS: | |
681 | lur.ret_code = -LTTNG_UST_ERR_NOSYS; | |
682 | break; | |
683 | default: | |
684 | lur.ret_code = -LTTNG_UST_ERR; | |
685 | break; | |
686 | } | |
687 | } else { | |
7bc53e94 | 688 | lur.ret_code = ret; |
64b2564e | 689 | } |
46050b1a | 690 | } |
e6ea14c5 MD |
691 | if (ret >= 0) { |
692 | switch (lum->cmd) { | |
e6ea14c5 MD |
693 | case LTTNG_UST_TRACER_VERSION: |
694 | lur.u.version = lum->u.version; | |
695 | break; | |
696 | case LTTNG_UST_TRACEPOINT_LIST_GET: | |
697 | memcpy(&lur.u.tracepoint, &lum->u.tracepoint, sizeof(lur.u.tracepoint)); | |
698 | break; | |
699 | } | |
381c0f1e | 700 | } |
74d81a6c | 701 | DBG("Return value: %d", lur.ret_val); |
46050b1a | 702 | ret = send_reply(sock, &lur); |
193183fb | 703 | if (ret < 0) { |
7bc53e94 | 704 | DBG("error sending reply"); |
193183fb MD |
705 | goto error; |
706 | } | |
46050b1a | 707 | |
40003310 MD |
708 | /* |
709 | * LTTNG_UST_TRACEPOINT_FIELD_LIST_GET needs to send the field | |
710 | * after the reply. | |
711 | */ | |
7bc53e94 | 712 | if (lur.ret_code == LTTNG_UST_OK) { |
40003310 MD |
713 | switch (lum->cmd) { |
714 | case LTTNG_UST_TRACEPOINT_FIELD_LIST_GET: | |
715 | len = ustcomm_send_unix_sock(sock, | |
716 | &args.field_list.entry, | |
717 | sizeof(args.field_list.entry)); | |
7bc53e94 MD |
718 | if (len < 0) { |
719 | ret = len; | |
720 | goto error; | |
721 | } | |
40003310 | 722 | if (len != sizeof(args.field_list.entry)) { |
7bc53e94 | 723 | ret = -EINVAL; |
40003310 MD |
724 | goto error; |
725 | } | |
726 | } | |
727 | } | |
ef9ff354 | 728 | |
381c0f1e | 729 | error: |
17dfb34b | 730 | ust_unlock(); |
d9e99d10 | 731 | |
37dddb65 MD |
732 | /* |
733 | * Performed delayed statedump operations outside of the UST | |
734 | * lock. We need to take the dynamic loader lock before we take | |
735 | * the UST lock internally within handle_pending_statedump(). | |
736 | */ | |
737 | handle_pending_statedump(sock_info); | |
246be17e | 738 | |
37dddb65 | 739 | return ret; |
246be17e PW |
740 | } |
741 | ||
46050b1a | 742 | static |
efe0de09 | 743 | void cleanup_sock_info(struct sock_info *sock_info, int exiting) |
46050b1a MD |
744 | { |
745 | int ret; | |
746 | ||
5b14aab3 MD |
747 | if (sock_info->root_handle != -1) { |
748 | ret = lttng_ust_objd_unref(sock_info->root_handle, 1); | |
749 | if (ret) { | |
750 | ERR("Error unref root handle"); | |
751 | } | |
752 | sock_info->root_handle = -1; | |
753 | } | |
754 | sock_info->constructor_sem_posted = 0; | |
755 | ||
756 | /* | |
757 | * wait_shm_mmap, socket and notify socket are used by listener | |
758 | * threads outside of the ust lock, so we cannot tear them down | |
759 | * ourselves, because we cannot join on these threads. Leave | |
760 | * responsibility of cleaning up these resources to the OS | |
761 | * process exit. | |
762 | */ | |
763 | if (exiting) | |
764 | return; | |
765 | ||
46050b1a | 766 | if (sock_info->socket != -1) { |
e6973a89 | 767 | ret = ustcomm_close_unix_sock(sock_info->socket); |
46050b1a | 768 | if (ret) { |
32ce8569 | 769 | ERR("Error closing ust cmd socket"); |
46050b1a MD |
770 | } |
771 | sock_info->socket = -1; | |
772 | } | |
32ce8569 MD |
773 | if (sock_info->notify_socket != -1) { |
774 | ret = ustcomm_close_unix_sock(sock_info->notify_socket); | |
775 | if (ret) { | |
776 | ERR("Error closing ust notify socket"); | |
777 | } | |
778 | sock_info->notify_socket = -1; | |
779 | } | |
5b14aab3 | 780 | if (sock_info->wait_shm_mmap) { |
7fc90dca MD |
781 | ret = munmap(sock_info->wait_shm_mmap, sysconf(_SC_PAGE_SIZE)); |
782 | if (ret) { | |
783 | ERR("Error unmapping wait shm"); | |
784 | } | |
785 | sock_info->wait_shm_mmap = NULL; | |
786 | } | |
787 | } | |
788 | ||
58d4b2a2 | 789 | /* |
33bbeb90 MD |
790 | * Using fork to set umask in the child process (not multi-thread safe). |
791 | * We deal with the shm_open vs ftruncate race (happening when the | |
792 | * sessiond owns the shm and does not let everybody modify it, to ensure | |
793 | * safety against shm_unlink) by simply letting the mmap fail and | |
794 | * retrying after a few seconds. | |
795 | * For global shm, everybody has rw access to it until the sessiond | |
796 | * starts. | |
58d4b2a2 | 797 | */ |
7fc90dca | 798 | static |
58d4b2a2 | 799 | int get_wait_shm(struct sock_info *sock_info, size_t mmap_size) |
7fc90dca | 800 | { |
7fc90dca | 801 | int wait_shm_fd, ret; |
58d4b2a2 | 802 | pid_t pid; |
44e073f5 | 803 | |
58d4b2a2 | 804 | /* |
33bbeb90 | 805 | * Try to open read-only. |
58d4b2a2 | 806 | */ |
33bbeb90 | 807 | wait_shm_fd = shm_open(sock_info->wait_shm_path, O_RDONLY, 0); |
58d4b2a2 | 808 | if (wait_shm_fd >= 0) { |
7aa76730 MD |
809 | int32_t tmp_read; |
810 | ssize_t len; | |
811 | size_t bytes_read = 0; | |
812 | ||
813 | /* | |
814 | * Try to read the fd. If unable to do so, try opening | |
815 | * it in write mode. | |
816 | */ | |
817 | do { | |
818 | len = read(wait_shm_fd, | |
819 | &((char *) &tmp_read)[bytes_read], | |
820 | sizeof(tmp_read) - bytes_read); | |
821 | if (len > 0) { | |
822 | bytes_read += len; | |
823 | } | |
824 | } while ((len < 0 && errno == EINTR) | |
825 | || (len > 0 && bytes_read < sizeof(tmp_read))); | |
826 | if (bytes_read != sizeof(tmp_read)) { | |
827 | ret = close(wait_shm_fd); | |
828 | if (ret) { | |
829 | ERR("close wait_shm_fd"); | |
830 | } | |
831 | goto open_write; | |
832 | } | |
58d4b2a2 MD |
833 | goto end; |
834 | } else if (wait_shm_fd < 0 && errno != ENOENT) { | |
835 | /* | |
33bbeb90 MD |
836 | * Real-only open did not work, and it's not because the |
837 | * entry was not present. It's a failure that prohibits | |
838 | * using shm. | |
58d4b2a2 | 839 | */ |
7fc90dca | 840 | ERR("Error opening shm %s", sock_info->wait_shm_path); |
58d4b2a2 | 841 | goto end; |
7fc90dca | 842 | } |
7aa76730 MD |
843 | |
844 | open_write: | |
7fc90dca | 845 | /* |
7aa76730 MD |
846 | * If the open failed because the file did not exist, or because |
847 | * the file was not truncated yet, try creating it ourself. | |
7fc90dca | 848 | */ |
8c90a710 | 849 | URCU_TLS(lttng_ust_nest_count)++; |
58d4b2a2 | 850 | pid = fork(); |
8c90a710 | 851 | URCU_TLS(lttng_ust_nest_count)--; |
58d4b2a2 MD |
852 | if (pid > 0) { |
853 | int status; | |
854 | ||
855 | /* | |
856 | * Parent: wait for child to return, in which case the | |
857 | * shared memory map will have been created. | |
858 | */ | |
859 | pid = wait(&status); | |
b7d3cb32 | 860 | if (pid < 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
58d4b2a2 MD |
861 | wait_shm_fd = -1; |
862 | goto end; | |
7fc90dca | 863 | } |
58d4b2a2 MD |
864 | /* |
865 | * Try to open read-only again after creation. | |
866 | */ | |
33bbeb90 | 867 | wait_shm_fd = shm_open(sock_info->wait_shm_path, O_RDONLY, 0); |
58d4b2a2 MD |
868 | if (wait_shm_fd < 0) { |
869 | /* | |
870 | * Real-only open did not work. It's a failure | |
871 | * that prohibits using shm. | |
872 | */ | |
873 | ERR("Error opening shm %s", sock_info->wait_shm_path); | |
874 | goto end; | |
875 | } | |
876 | goto end; | |
877 | } else if (pid == 0) { | |
878 | int create_mode; | |
879 | ||
880 | /* Child */ | |
33bbeb90 | 881 | create_mode = S_IRUSR | S_IWUSR | S_IRGRP; |
58d4b2a2 | 882 | if (sock_info->global) |
33bbeb90 | 883 | create_mode |= S_IROTH | S_IWGRP | S_IWOTH; |
58d4b2a2 MD |
884 | /* |
885 | * We're alone in a child process, so we can modify the | |
886 | * process-wide umask. | |
887 | */ | |
33bbeb90 | 888 | umask(~create_mode); |
58d4b2a2 | 889 | /* |
33bbeb90 MD |
890 | * Try creating shm (or get rw access). |
891 | * We don't do an exclusive open, because we allow other | |
892 | * processes to create+ftruncate it concurrently. | |
58d4b2a2 MD |
893 | */ |
894 | wait_shm_fd = shm_open(sock_info->wait_shm_path, | |
895 | O_RDWR | O_CREAT, create_mode); | |
896 | if (wait_shm_fd >= 0) { | |
897 | ret = ftruncate(wait_shm_fd, mmap_size); | |
898 | if (ret) { | |
899 | PERROR("ftruncate"); | |
b0c1425d | 900 | _exit(EXIT_FAILURE); |
58d4b2a2 | 901 | } |
b0c1425d | 902 | _exit(EXIT_SUCCESS); |
58d4b2a2 | 903 | } |
33bbeb90 MD |
904 | /* |
905 | * For local shm, we need to have rw access to accept | |
906 | * opening it: this means the local sessiond will be | |
907 | * able to wake us up. For global shm, we open it even | |
908 | * if rw access is not granted, because the root.root | |
909 | * sessiond will be able to override all rights and wake | |
910 | * us up. | |
911 | */ | |
912 | if (!sock_info->global && errno != EACCES) { | |
58d4b2a2 | 913 | ERR("Error opening shm %s", sock_info->wait_shm_path); |
5d3bc5ed | 914 | _exit(EXIT_FAILURE); |
58d4b2a2 MD |
915 | } |
916 | /* | |
33bbeb90 MD |
917 | * The shm exists, but we cannot open it RW. Report |
918 | * success. | |
58d4b2a2 | 919 | */ |
5d3bc5ed | 920 | _exit(EXIT_SUCCESS); |
58d4b2a2 MD |
921 | } else { |
922 | return -1; | |
7fc90dca | 923 | } |
58d4b2a2 | 924 | end: |
33bbeb90 MD |
925 | if (wait_shm_fd >= 0 && !sock_info->global) { |
926 | struct stat statbuf; | |
927 | ||
928 | /* | |
929 | * Ensure that our user is the owner of the shm file for | |
930 | * local shm. If we do not own the file, it means our | |
931 | * sessiond will not have access to wake us up (there is | |
932 | * probably a rogue process trying to fake our | |
933 | * sessiond). Fallback to polling method in this case. | |
934 | */ | |
935 | ret = fstat(wait_shm_fd, &statbuf); | |
936 | if (ret) { | |
937 | PERROR("fstat"); | |
938 | goto error_close; | |
939 | } | |
940 | if (statbuf.st_uid != getuid()) | |
941 | goto error_close; | |
942 | } | |
58d4b2a2 | 943 | return wait_shm_fd; |
33bbeb90 MD |
944 | |
945 | error_close: | |
946 | ret = close(wait_shm_fd); | |
947 | if (ret) { | |
948 | PERROR("Error closing fd"); | |
949 | } | |
950 | return -1; | |
58d4b2a2 MD |
951 | } |
952 | ||
953 | static | |
954 | char *get_map_shm(struct sock_info *sock_info) | |
955 | { | |
956 | size_t mmap_size = sysconf(_SC_PAGE_SIZE); | |
957 | int wait_shm_fd, ret; | |
958 | char *wait_shm_mmap; | |
959 | ||
960 | wait_shm_fd = get_wait_shm(sock_info, mmap_size); | |
961 | if (wait_shm_fd < 0) { | |
962 | goto error; | |
44e073f5 | 963 | } |
7fc90dca MD |
964 | wait_shm_mmap = mmap(NULL, mmap_size, PROT_READ, |
965 | MAP_SHARED, wait_shm_fd, 0); | |
7fc90dca MD |
966 | /* close shm fd immediately after taking the mmap reference */ |
967 | ret = close(wait_shm_fd); | |
968 | if (ret) { | |
33bbeb90 MD |
969 | PERROR("Error closing fd"); |
970 | } | |
971 | if (wait_shm_mmap == MAP_FAILED) { | |
972 | DBG("mmap error (can be caused by race with sessiond). Fallback to poll mode."); | |
973 | goto error; | |
7fc90dca MD |
974 | } |
975 | return wait_shm_mmap; | |
976 | ||
977 | error: | |
978 | return NULL; | |
979 | } | |
980 | ||
981 | static | |
982 | void wait_for_sessiond(struct sock_info *sock_info) | |
983 | { | |
efe0de09 | 984 | int ret; |
80e2814b | 985 | |
7fc90dca MD |
986 | ust_lock(); |
987 | if (lttng_ust_comm_should_quit) { | |
988 | goto quit; | |
989 | } | |
37ed587a MD |
990 | if (wait_poll_fallback) { |
991 | goto error; | |
992 | } | |
7fc90dca MD |
993 | if (!sock_info->wait_shm_mmap) { |
994 | sock_info->wait_shm_mmap = get_map_shm(sock_info); | |
995 | if (!sock_info->wait_shm_mmap) | |
996 | goto error; | |
997 | } | |
998 | ust_unlock(); | |
999 | ||
1000 | DBG("Waiting for %s apps sessiond", sock_info->name); | |
80e2814b MD |
1001 | /* Wait for futex wakeup */ |
1002 | if (uatomic_read((int32_t *) sock_info->wait_shm_mmap) == 0) { | |
1003 | ret = futex_async((int32_t *) sock_info->wait_shm_mmap, | |
1004 | FUTEX_WAIT, 0, NULL, NULL, 0); | |
80e2814b | 1005 | if (ret < 0) { |
37ed587a MD |
1006 | if (errno == EFAULT) { |
1007 | wait_poll_fallback = 1; | |
a8b870ad | 1008 | DBG( |
37ed587a MD |
1009 | "Linux kernels 2.6.33 to 3.0 (with the exception of stable versions) " |
1010 | "do not support FUTEX_WAKE on read-only memory mappings correctly. " | |
1011 | "Please upgrade your kernel " | |
1012 | "(fix is commit 9ea71503a8ed9184d2d0b8ccc4d269d05f7940ae in Linux kernel " | |
1013 | "mainline). LTTng-UST will use polling mode fallback."); | |
cd27263b MD |
1014 | if (ust_debug()) |
1015 | PERROR("futex"); | |
37ed587a | 1016 | } |
80e2814b MD |
1017 | } |
1018 | } | |
7fc90dca MD |
1019 | return; |
1020 | ||
1021 | quit: | |
1022 | ust_unlock(); | |
1023 | return; | |
1024 | ||
1025 | error: | |
1026 | ust_unlock(); | |
7fc90dca | 1027 | return; |
46050b1a MD |
1028 | } |
1029 | ||
1ea11eab MD |
1030 | /* |
1031 | * This thread does not allocate any resource, except within | |
1032 | * handle_message, within mutex protection. This mutex protects against | |
1033 | * fork and exit. | |
98bf993f | 1034 | * The other moment it allocates resources is at socket connection, which |
1ea11eab MD |
1035 | * is also protected by the mutex. |
1036 | */ | |
d9e99d10 MD |
1037 | static |
1038 | void *ust_listener_thread(void *arg) | |
1039 | { | |
1ea11eab | 1040 | struct sock_info *sock_info = arg; |
c0eedf81 | 1041 | int sock, ret, prev_connect_failed = 0, has_waited = 0; |
ff517991 | 1042 | long timeout; |
d9e99d10 | 1043 | |
9eb62b9c MD |
1044 | /* Restart trying to connect to the session daemon */ |
1045 | restart: | |
c0eedf81 MD |
1046 | if (prev_connect_failed) { |
1047 | /* Wait for sessiond availability with pipe */ | |
1048 | wait_for_sessiond(sock_info); | |
1049 | if (has_waited) { | |
1050 | has_waited = 0; | |
1051 | /* | |
1052 | * Sleep for 5 seconds before retrying after a | |
1053 | * sequence of failure / wait / failure. This | |
1054 | * deals with a killed or broken session daemon. | |
1055 | */ | |
1056 | sleep(5); | |
1057 | } | |
1058 | has_waited = 1; | |
1059 | prev_connect_failed = 0; | |
1060 | } | |
9eb62b9c | 1061 | |
1ea11eab | 1062 | if (sock_info->socket != -1) { |
e6973a89 | 1063 | ret = ustcomm_close_unix_sock(sock_info->socket); |
1ea11eab | 1064 | if (ret) { |
32ce8569 MD |
1065 | ERR("Error closing %s ust cmd socket", |
1066 | sock_info->name); | |
1ea11eab MD |
1067 | } |
1068 | sock_info->socket = -1; | |
1069 | } | |
32ce8569 MD |
1070 | if (sock_info->notify_socket != -1) { |
1071 | ret = ustcomm_close_unix_sock(sock_info->notify_socket); | |
1072 | if (ret) { | |
1073 | ERR("Error closing %s ust notify socket", | |
1074 | sock_info->name); | |
1075 | } | |
1076 | sock_info->notify_socket = -1; | |
1077 | } | |
46050b1a | 1078 | |
321f2351 MD |
1079 | /* |
1080 | * Register. We need to perform both connect and sending | |
1081 | * registration message before doing the next connect otherwise | |
1082 | * we may reach unix socket connect queue max limits and block | |
1083 | * on the 2nd connect while the session daemon is awaiting the | |
1084 | * first connect registration message. | |
1085 | */ | |
1086 | /* Connect cmd socket */ | |
1087 | ret = ustcomm_connect_unix_sock(sock_info->sock_path); | |
1088 | if (ret < 0) { | |
1089 | DBG("Info: sessiond not accepting connections to %s apps socket", sock_info->name); | |
1090 | prev_connect_failed = 1; | |
5b14aab3 | 1091 | |
321f2351 | 1092 | ust_lock(); |
5b14aab3 | 1093 | |
321f2351 MD |
1094 | if (lttng_ust_comm_should_quit) { |
1095 | goto quit; | |
32ce8569 | 1096 | } |
46050b1a | 1097 | |
e3426ddc | 1098 | /* |
321f2351 MD |
1099 | * If we cannot find the sessiond daemon, don't delay |
1100 | * constructor execution. | |
e3426ddc | 1101 | */ |
321f2351 MD |
1102 | ret = handle_register_done(sock_info); |
1103 | assert(!ret); | |
1104 | ust_unlock(); | |
1105 | goto restart; | |
27fe9f21 | 1106 | } |
321f2351 | 1107 | sock_info->socket = ret; |
27fe9f21 | 1108 | |
5b14aab3 MD |
1109 | ust_lock(); |
1110 | ||
1111 | if (lttng_ust_comm_should_quit) { | |
1112 | goto quit; | |
1113 | } | |
1114 | ||
46050b1a MD |
1115 | /* |
1116 | * Create only one root handle per listener thread for the whole | |
f59ed768 MD |
1117 | * process lifetime, so we ensure we get ID which is statically |
1118 | * assigned to the root handle. | |
46050b1a MD |
1119 | */ |
1120 | if (sock_info->root_handle == -1) { | |
1121 | ret = lttng_abi_create_root_handle(); | |
a51070bb | 1122 | if (ret < 0) { |
46050b1a | 1123 | ERR("Error creating root handle"); |
46050b1a MD |
1124 | goto quit; |
1125 | } | |
1126 | sock_info->root_handle = ret; | |
9eb62b9c | 1127 | } |
1ea11eab | 1128 | |
32ce8569 | 1129 | ret = register_to_sessiond(sock_info->socket, USTCTL_SOCKET_CMD); |
9eb62b9c | 1130 | if (ret < 0) { |
32ce8569 MD |
1131 | ERR("Error registering to %s ust cmd socket", |
1132 | sock_info->name); | |
c0eedf81 | 1133 | prev_connect_failed = 1; |
11ff9c7d MD |
1134 | /* |
1135 | * If we cannot register to the sessiond daemon, don't | |
1136 | * delay constructor execution. | |
1137 | */ | |
edaa1431 | 1138 | ret = handle_register_done(sock_info); |
11ff9c7d | 1139 | assert(!ret); |
17dfb34b | 1140 | ust_unlock(); |
9eb62b9c MD |
1141 | goto restart; |
1142 | } | |
321f2351 MD |
1143 | |
1144 | ust_unlock(); | |
1145 | ||
1146 | /* Connect notify socket */ | |
1147 | ret = ustcomm_connect_unix_sock(sock_info->sock_path); | |
1148 | if (ret < 0) { | |
1149 | DBG("Info: sessiond not accepting connections to %s apps socket", sock_info->name); | |
1150 | prev_connect_failed = 1; | |
1151 | ||
1152 | ust_lock(); | |
1153 | ||
1154 | if (lttng_ust_comm_should_quit) { | |
1155 | goto quit; | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * If we cannot find the sessiond daemon, don't delay | |
1160 | * constructor execution. | |
1161 | */ | |
1162 | ret = handle_register_done(sock_info); | |
1163 | assert(!ret); | |
1164 | ust_unlock(); | |
1165 | goto restart; | |
1166 | } | |
1167 | sock_info->notify_socket = ret; | |
1168 | ||
1169 | timeout = get_notify_sock_timeout(); | |
1170 | if (timeout >= 0) { | |
1171 | /* | |
1172 | * Give at least 10ms to sessiond to reply to | |
1173 | * notifications. | |
1174 | */ | |
1175 | if (timeout < 10) | |
1176 | timeout = 10; | |
1177 | ret = ustcomm_setsockopt_rcv_timeout(sock_info->notify_socket, | |
1178 | timeout); | |
1179 | if (ret < 0) { | |
1180 | WARN("Error setting socket receive timeout"); | |
1181 | } | |
1182 | ret = ustcomm_setsockopt_snd_timeout(sock_info->notify_socket, | |
1183 | timeout); | |
1184 | if (ret < 0) { | |
1185 | WARN("Error setting socket send timeout"); | |
1186 | } | |
1187 | } else if (timeout < -1) { | |
1188 | WARN("Unsupported timeout value %ld", timeout); | |
1189 | } | |
1190 | ||
1191 | ust_lock(); | |
1192 | ||
1193 | if (lttng_ust_comm_should_quit) { | |
1194 | goto quit; | |
1195 | } | |
1196 | ||
32ce8569 MD |
1197 | ret = register_to_sessiond(sock_info->notify_socket, |
1198 | USTCTL_SOCKET_NOTIFY); | |
1199 | if (ret < 0) { | |
1200 | ERR("Error registering to %s ust notify socket", | |
1201 | sock_info->name); | |
1202 | prev_connect_failed = 1; | |
1203 | /* | |
1204 | * If we cannot register to the sessiond daemon, don't | |
1205 | * delay constructor execution. | |
1206 | */ | |
1207 | ret = handle_register_done(sock_info); | |
1208 | assert(!ret); | |
1209 | ust_unlock(); | |
1210 | goto restart; | |
1211 | } | |
1212 | sock = sock_info->socket; | |
1213 | ||
17dfb34b | 1214 | ust_unlock(); |
46050b1a | 1215 | |
d9e99d10 MD |
1216 | for (;;) { |
1217 | ssize_t len; | |
57773204 | 1218 | struct ustcomm_ust_msg lum; |
d9e99d10 | 1219 | |
57773204 | 1220 | len = ustcomm_recv_unix_sock(sock, &lum, sizeof(lum)); |
d9e99d10 MD |
1221 | switch (len) { |
1222 | case 0: /* orderly shutdown */ | |
7dd08bec | 1223 | DBG("%s lttng-sessiond has performed an orderly shutdown", sock_info->name); |
8236ba10 | 1224 | ust_lock(); |
d5e1fea6 | 1225 | if (lttng_ust_comm_should_quit) { |
d5e1fea6 MD |
1226 | goto quit; |
1227 | } | |
8236ba10 MD |
1228 | /* |
1229 | * Either sessiond has shutdown or refused us by closing the socket. | |
1230 | * In either case, we don't want to delay construction execution, | |
1231 | * and we need to wait before retry. | |
1232 | */ | |
1233 | prev_connect_failed = 1; | |
1234 | /* | |
1235 | * If we cannot register to the sessiond daemon, don't | |
1236 | * delay constructor execution. | |
1237 | */ | |
1238 | ret = handle_register_done(sock_info); | |
1239 | assert(!ret); | |
1240 | ust_unlock(); | |
d9e99d10 | 1241 | goto end; |
e7723462 | 1242 | case sizeof(lum): |
74d81a6c | 1243 | print_cmd(lum.cmd, lum.handle); |
11ff9c7d | 1244 | ret = handle_message(sock_info, sock, &lum); |
7bc53e94 | 1245 | if (ret) { |
11ff9c7d | 1246 | ERR("Error handling message for %s socket", sock_info->name); |
d9e99d10 MD |
1247 | } |
1248 | continue; | |
7bc53e94 MD |
1249 | default: |
1250 | if (len < 0) { | |
1251 | DBG("Receive failed from lttng-sessiond with errno %d", (int) -len); | |
1252 | } else { | |
1253 | DBG("incorrect message size (%s socket): %zd", sock_info->name, len); | |
1254 | } | |
1255 | if (len == -ECONNRESET) { | |
1256 | DBG("%s remote end closed connection", sock_info->name); | |
d9e99d10 MD |
1257 | goto end; |
1258 | } | |
1259 | goto end; | |
d9e99d10 MD |
1260 | } |
1261 | ||
1262 | } | |
1263 | end: | |
f59ed768 | 1264 | ust_lock(); |
d5e1fea6 | 1265 | if (lttng_ust_comm_should_quit) { |
d5e1fea6 MD |
1266 | goto quit; |
1267 | } | |
f59ed768 MD |
1268 | /* Cleanup socket handles before trying to reconnect */ |
1269 | lttng_ust_objd_table_owner_cleanup(sock_info); | |
1270 | ust_unlock(); | |
9eb62b9c | 1271 | goto restart; /* try to reconnect */ |
e33f3265 | 1272 | |
1ea11eab | 1273 | quit: |
e33f3265 MD |
1274 | sock_info->thread_active = 0; |
1275 | ust_unlock(); | |
d9e99d10 MD |
1276 | return NULL; |
1277 | } | |
1278 | ||
2691221a MD |
1279 | /* |
1280 | * sessiond monitoring thread: monitor presence of global and per-user | |
1281 | * sessiond by polling the application common named pipe. | |
1282 | */ | |
edaa1431 | 1283 | void __attribute__((constructor)) lttng_ust_init(void) |
2691221a | 1284 | { |
11ff9c7d | 1285 | struct timespec constructor_timeout; |
ae6a58bf | 1286 | sigset_t sig_all_blocked, orig_parent_mask; |
1879f67f | 1287 | pthread_attr_t thread_attr; |
cf12a773 | 1288 | int timeout_mode; |
2691221a MD |
1289 | int ret; |
1290 | ||
edaa1431 MD |
1291 | if (uatomic_xchg(&initialized, 1) == 1) |
1292 | return; | |
1293 | ||
eddd8d5d MD |
1294 | /* |
1295 | * Fixup interdependency between TLS fixup mutex (which happens | |
1296 | * to be the dynamic linker mutex) and ust_lock, taken within | |
1297 | * the ust lock. | |
1298 | */ | |
f645cfa7 | 1299 | lttng_fixup_ringbuffer_tls(); |
4158a15a | 1300 | lttng_fixup_vtid_tls(); |
a903623f | 1301 | lttng_fixup_nest_count_tls(); |
009745db | 1302 | lttng_fixup_procname_tls(); |
eddd8d5d | 1303 | |
edaa1431 MD |
1304 | /* |
1305 | * We want precise control over the order in which we construct | |
1306 | * our sub-libraries vs starting to receive commands from | |
1307 | * sessiond (otherwise leading to errors when trying to create | |
1308 | * sessiond before the init functions are completed). | |
1309 | */ | |
2691221a | 1310 | init_usterr(); |
edaa1431 | 1311 | init_tracepoint(); |
7dd08bec MD |
1312 | lttng_ring_buffer_metadata_client_init(); |
1313 | lttng_ring_buffer_client_overwrite_init(); | |
34a91bdb | 1314 | lttng_ring_buffer_client_overwrite_rt_init(); |
7dd08bec | 1315 | lttng_ring_buffer_client_discard_init(); |
34a91bdb | 1316 | lttng_ring_buffer_client_discard_rt_init(); |
a0a3bef9 | 1317 | lttng_context_init(); |
2691221a | 1318 | |
ff517991 | 1319 | timeout_mode = get_constructor_timeout(&constructor_timeout); |
11ff9c7d | 1320 | |
95259bd0 | 1321 | ret = sem_init(&constructor_wait, 0, 0); |
11ff9c7d MD |
1322 | assert(!ret); |
1323 | ||
8d20bf54 | 1324 | ret = setup_local_apps(); |
2691221a | 1325 | if (ret) { |
9ec6895c | 1326 | DBG("local apps setup returned %d", ret); |
2691221a | 1327 | } |
ae6a58bf WP |
1328 | |
1329 | /* A new thread created by pthread_create inherits the signal mask | |
1330 | * from the parent. To avoid any signal being received by the | |
1331 | * listener thread, we block all signals temporarily in the parent, | |
1332 | * while we create the listener thread. | |
1333 | */ | |
1334 | sigfillset(&sig_all_blocked); | |
1335 | ret = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_parent_mask); | |
1336 | if (ret) { | |
d94d802c | 1337 | ERR("pthread_sigmask: %s", strerror(ret)); |
ae6a58bf WP |
1338 | } |
1339 | ||
1879f67f MG |
1340 | ret = pthread_attr_init(&thread_attr); |
1341 | if (ret) { | |
1342 | ERR("pthread_attr_init: %s", strerror(ret)); | |
1343 | } | |
1344 | ret = pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED); | |
1345 | if (ret) { | |
1346 | ERR("pthread_attr_setdetachstate: %s", strerror(ret)); | |
1347 | } | |
1348 | ||
e33f3265 | 1349 | ust_lock(); |
1879f67f | 1350 | ret = pthread_create(&global_apps.ust_listener, &thread_attr, |
dde70ea0 | 1351 | ust_listener_thread, &global_apps); |
d94d802c MD |
1352 | if (ret) { |
1353 | ERR("pthread_create global: %s", strerror(ret)); | |
1354 | } | |
e33f3265 MD |
1355 | global_apps.thread_active = 1; |
1356 | ust_unlock(); | |
1357 | ||
8d20bf54 | 1358 | if (local_apps.allowed) { |
e33f3265 | 1359 | ust_lock(); |
1879f67f | 1360 | ret = pthread_create(&local_apps.ust_listener, &thread_attr, |
dde70ea0 | 1361 | ust_listener_thread, &local_apps); |
d94d802c MD |
1362 | if (ret) { |
1363 | ERR("pthread_create local: %s", strerror(ret)); | |
1364 | } | |
e33f3265 MD |
1365 | local_apps.thread_active = 1; |
1366 | ust_unlock(); | |
8d20bf54 MD |
1367 | } else { |
1368 | handle_register_done(&local_apps); | |
1369 | } | |
1879f67f MG |
1370 | ret = pthread_attr_destroy(&thread_attr); |
1371 | if (ret) { | |
1372 | ERR("pthread_attr_destroy: %s", strerror(ret)); | |
1373 | } | |
8d20bf54 | 1374 | |
ae6a58bf WP |
1375 | /* Restore original signal mask in parent */ |
1376 | ret = pthread_sigmask(SIG_SETMASK, &orig_parent_mask, NULL); | |
1377 | if (ret) { | |
d94d802c | 1378 | ERR("pthread_sigmask: %s", strerror(ret)); |
ae6a58bf WP |
1379 | } |
1380 | ||
cf12a773 MD |
1381 | switch (timeout_mode) { |
1382 | case 1: /* timeout wait */ | |
95259bd0 MD |
1383 | do { |
1384 | ret = sem_timedwait(&constructor_wait, | |
1385 | &constructor_timeout); | |
1386 | } while (ret < 0 && errno == EINTR); | |
cf12a773 | 1387 | if (ret < 0 && errno == ETIMEDOUT) { |
7dd08bec | 1388 | ERR("Timed out waiting for lttng-sessiond"); |
cf12a773 MD |
1389 | } else { |
1390 | assert(!ret); | |
1391 | } | |
1392 | break; | |
7b766b16 | 1393 | case -1:/* wait forever */ |
95259bd0 MD |
1394 | do { |
1395 | ret = sem_wait(&constructor_wait); | |
1396 | } while (ret < 0 && errno == EINTR); | |
11ff9c7d | 1397 | assert(!ret); |
cf12a773 | 1398 | break; |
7b766b16 | 1399 | case 0: /* no timeout */ |
cf12a773 | 1400 | break; |
11ff9c7d | 1401 | } |
2691221a MD |
1402 | } |
1403 | ||
17dfb34b MD |
1404 | static |
1405 | void lttng_ust_cleanup(int exiting) | |
1406 | { | |
efe0de09 | 1407 | cleanup_sock_info(&global_apps, exiting); |
17dfb34b | 1408 | if (local_apps.allowed) { |
efe0de09 | 1409 | cleanup_sock_info(&local_apps, exiting); |
17dfb34b | 1410 | } |
efe0de09 MD |
1411 | /* |
1412 | * The teardown in this function all affect data structures | |
1413 | * accessed under the UST lock by the listener thread. This | |
1414 | * lock, along with the lttng_ust_comm_should_quit flag, ensure | |
1415 | * that none of these threads are accessing this data at this | |
1416 | * point. | |
1417 | */ | |
17dfb34b | 1418 | lttng_ust_abi_exit(); |
003fedf4 | 1419 | lttng_ust_events_exit(); |
a0a3bef9 | 1420 | lttng_context_exit(); |
34a91bdb | 1421 | lttng_ring_buffer_client_discard_rt_exit(); |
7dd08bec | 1422 | lttng_ring_buffer_client_discard_exit(); |
34a91bdb | 1423 | lttng_ring_buffer_client_overwrite_rt_exit(); |
7dd08bec MD |
1424 | lttng_ring_buffer_client_overwrite_exit(); |
1425 | lttng_ring_buffer_metadata_client_exit(); | |
17dfb34b MD |
1426 | exit_tracepoint(); |
1427 | if (!exiting) { | |
1428 | /* Reinitialize values for fork */ | |
1429 | sem_count = 2; | |
1430 | lttng_ust_comm_should_quit = 0; | |
1431 | initialized = 0; | |
1432 | } | |
1433 | } | |
1434 | ||
edaa1431 | 1435 | void __attribute__((destructor)) lttng_ust_exit(void) |
2691221a MD |
1436 | { |
1437 | int ret; | |
1438 | ||
9eb62b9c MD |
1439 | /* |
1440 | * Using pthread_cancel here because: | |
1441 | * A) we don't want to hang application teardown. | |
1442 | * B) the thread is not allocating any resource. | |
1443 | */ | |
1ea11eab MD |
1444 | |
1445 | /* | |
1446 | * Require the communication thread to quit. Synchronize with | |
1447 | * mutexes to ensure it is not in a mutex critical section when | |
1448 | * pthread_cancel is later called. | |
1449 | */ | |
17dfb34b | 1450 | ust_lock(); |
1ea11eab | 1451 | lttng_ust_comm_should_quit = 1; |
1ea11eab | 1452 | |
f5f94532 | 1453 | /* cancel threads */ |
e33f3265 MD |
1454 | if (global_apps.thread_active) { |
1455 | ret = pthread_cancel(global_apps.ust_listener); | |
1456 | if (ret) { | |
1457 | ERR("Error cancelling global ust listener thread: %s", | |
1458 | strerror(ret)); | |
1459 | } else { | |
1460 | global_apps.thread_active = 0; | |
1461 | } | |
2691221a | 1462 | } |
e33f3265 | 1463 | if (local_apps.thread_active) { |
8d20bf54 MD |
1464 | ret = pthread_cancel(local_apps.ust_listener); |
1465 | if (ret) { | |
d94d802c MD |
1466 | ERR("Error cancelling local ust listener thread: %s", |
1467 | strerror(ret)); | |
e33f3265 MD |
1468 | } else { |
1469 | local_apps.thread_active = 0; | |
8d20bf54 | 1470 | } |
8d20bf54 | 1471 | } |
e33f3265 MD |
1472 | ust_unlock(); |
1473 | ||
efe0de09 MD |
1474 | /* |
1475 | * Do NOT join threads: use of sys_futex makes it impossible to | |
1476 | * join the threads without using async-cancel, but async-cancel | |
1477 | * is delivered by a signal, which could hit the target thread | |
1478 | * anywhere in its code path, including while the ust_lock() is | |
1479 | * held, causing a deadlock for the other thread. Let the OS | |
1480 | * cleanup the threads if there are stalled in a syscall. | |
1481 | */ | |
17dfb34b | 1482 | lttng_ust_cleanup(1); |
2691221a | 1483 | } |
e822f505 MD |
1484 | |
1485 | /* | |
1486 | * We exclude the worker threads across fork and clone (except | |
1487 | * CLONE_VM), because these system calls only keep the forking thread | |
1488 | * running in the child. Therefore, we don't want to call fork or clone | |
1489 | * in the middle of an tracepoint or ust tracing state modification. | |
1490 | * Holding this mutex protects these structures across fork and clone. | |
1491 | */ | |
b728d87e | 1492 | void ust_before_fork(sigset_t *save_sigset) |
e822f505 MD |
1493 | { |
1494 | /* | |
1495 | * Disable signals. This is to avoid that the child intervenes | |
1496 | * before it is properly setup for tracing. It is safer to | |
1497 | * disable all signals, because then we know we are not breaking | |
1498 | * anything by restoring the original mask. | |
1499 | */ | |
1500 | sigset_t all_sigs; | |
1501 | int ret; | |
1502 | ||
8c90a710 | 1503 | if (URCU_TLS(lttng_ust_nest_count)) |
e8508a49 | 1504 | return; |
e822f505 MD |
1505 | /* Disable signals */ |
1506 | sigfillset(&all_sigs); | |
b728d87e | 1507 | ret = sigprocmask(SIG_BLOCK, &all_sigs, save_sigset); |
e822f505 MD |
1508 | if (ret == -1) { |
1509 | PERROR("sigprocmask"); | |
1510 | } | |
17dfb34b | 1511 | ust_lock(); |
e822f505 MD |
1512 | rcu_bp_before_fork(); |
1513 | } | |
1514 | ||
b728d87e | 1515 | static void ust_after_fork_common(sigset_t *restore_sigset) |
e822f505 MD |
1516 | { |
1517 | int ret; | |
1518 | ||
17dfb34b MD |
1519 | DBG("process %d", getpid()); |
1520 | ust_unlock(); | |
e822f505 | 1521 | /* Restore signals */ |
23c8854a | 1522 | ret = sigprocmask(SIG_SETMASK, restore_sigset, NULL); |
e822f505 MD |
1523 | if (ret == -1) { |
1524 | PERROR("sigprocmask"); | |
1525 | } | |
1526 | } | |
1527 | ||
b728d87e | 1528 | void ust_after_fork_parent(sigset_t *restore_sigset) |
e822f505 | 1529 | { |
8c90a710 | 1530 | if (URCU_TLS(lttng_ust_nest_count)) |
e8508a49 | 1531 | return; |
17dfb34b | 1532 | DBG("process %d", getpid()); |
e822f505 MD |
1533 | rcu_bp_after_fork_parent(); |
1534 | /* Release mutexes and reenable signals */ | |
b728d87e | 1535 | ust_after_fork_common(restore_sigset); |
e822f505 MD |
1536 | } |
1537 | ||
17dfb34b MD |
1538 | /* |
1539 | * After fork, in the child, we need to cleanup all the leftover state, | |
1540 | * except the worker thread which already magically disappeared thanks | |
1541 | * to the weird Linux fork semantics. After tyding up, we call | |
1542 | * lttng_ust_init() again to start over as a new PID. | |
1543 | * | |
1544 | * This is meant for forks() that have tracing in the child between the | |
1545 | * fork and following exec call (if there is any). | |
1546 | */ | |
b728d87e | 1547 | void ust_after_fork_child(sigset_t *restore_sigset) |
e822f505 | 1548 | { |
8c90a710 | 1549 | if (URCU_TLS(lttng_ust_nest_count)) |
e8508a49 | 1550 | return; |
17dfb34b | 1551 | DBG("process %d", getpid()); |
e822f505 MD |
1552 | /* Release urcu mutexes */ |
1553 | rcu_bp_after_fork_child(); | |
17dfb34b | 1554 | lttng_ust_cleanup(0); |
a93bfc45 | 1555 | lttng_context_vtid_reset(); |
e822f505 | 1556 | /* Release mutexes and reenable signals */ |
b728d87e | 1557 | ust_after_fork_common(restore_sigset); |
318dfea9 | 1558 | lttng_ust_init(); |
e822f505 | 1559 | } |
95c25348 | 1560 | |
246be17e | 1561 | void lttng_ust_sockinfo_session_enabled(void *owner) |
95c25348 PW |
1562 | { |
1563 | struct sock_info *sock_info = owner; | |
37dddb65 | 1564 | sock_info->statedump_pending = 1; |
95c25348 | 1565 | } |