Commit | Line | Data |
---|---|---|
c39c72ee PMF |
1 | /* Copyright (C) 2009 Pierre-Marc Fournier |
2 | * | |
3 | * This library is free software; you can redistribute it and/or | |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public | |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
1eba9d6b PMF |
18 | /* This file contains the implementation of the UST listener thread, which |
19 | * receives trace control commands. It also coordinates the initialization of | |
20 | * libust. | |
21 | */ | |
22 | ||
872037bb | 23 | #define _GNU_SOURCE |
68c1021b | 24 | #include <stdio.h> |
909bc43f | 25 | #include <stdlib.h> |
68c1021b | 26 | #include <stdint.h> |
f51d84ea | 27 | #include <pthread.h> |
68c1021b | 28 | #include <signal.h> |
4723ca09 NC |
29 | #include <sys/epoll.h> |
30 | #include <sys/time.h> | |
68c1021b PMF |
31 | #include <sys/types.h> |
32 | #include <sys/socket.h> | |
a584bc4e | 33 | #include <fcntl.h> |
3a7b90de | 34 | #include <poll.h> |
ef290fca | 35 | #include <regex.h> |
b102c2b0 | 36 | #include <urcu/uatomic_arch.h> |
4723ca09 | 37 | #include <urcu/list.h> |
fbd8191b | 38 | |
93d0f2ea | 39 | #include <ust/marker.h> |
a3adfb05 | 40 | #include <ust/tracepoint.h> |
616ed36a | 41 | #include <ust/tracectl.h> |
9c6bb081 | 42 | #include <ust/clock.h> |
c93858f1 | 43 | #include "tracer.h" |
6af64c43 | 44 | #include "usterr.h" |
d0b5f2b9 | 45 | #include "ustcomm.h" |
b73a4c47 | 46 | #include "buffers.h" |
9160b4e4 | 47 | #include "marker-control.h" |
fbd8191b | 48 | |
ed1317e7 PMF |
49 | /* This should only be accessed by the constructor, before the creation |
50 | * of the listener, and then only by the listener. | |
51 | */ | |
52 | s64 pidunique = -1LL; | |
53 | ||
bc237fab NC |
54 | /* The process pid is used to detect a non-traceable fork |
55 | * and allow the non-traceable fork to be ignored | |
56 | * by destructor sequences in libust | |
57 | */ | |
58 | static pid_t processpid = 0; | |
59 | ||
72098143 NC |
60 | static struct ustcomm_header _receive_header; |
61 | static struct ustcomm_header *receive_header = &_receive_header; | |
62 | static char receive_buffer[USTCOMM_BUFFER_SIZE]; | |
63 | static char send_buffer[USTCOMM_BUFFER_SIZE]; | |
64 | ||
4723ca09 | 65 | static int epoll_fd; |
fd9c2963 MD |
66 | |
67 | /* | |
68 | * Listener thread data vs fork() protection mechanism. Ensures that no listener | |
69 | * thread mutexes and data structures are being concurrently modified or held by | |
70 | * other threads when fork() is executed. | |
71 | */ | |
72 | static pthread_mutex_t listener_thread_data_mutex = PTHREAD_MUTEX_INITIALIZER; | |
73 | ||
74 | /* Mutex protecting listen_sock. Nests inside listener_thread_data_mutex. */ | |
75 | static pthread_mutex_t listen_sock_mutex = PTHREAD_MUTEX_INITIALIZER; | |
4723ca09 | 76 | static struct ustcomm_sock *listen_sock; |
223f2e7c | 77 | |
4723ca09 | 78 | extern struct chan_info_struct chan_infos[]; |
3a7b90de | 79 | |
0222e121 | 80 | static struct cds_list_head open_buffers_list = CDS_LIST_HEAD_INIT(open_buffers_list); |
d0b5f2b9 | 81 | |
0222e121 | 82 | static struct cds_list_head ust_socks = CDS_LIST_HEAD_INIT(ust_socks); |
68c1021b | 83 | |
f293009f | 84 | /* volatile because shared between the listener and the main thread */ |
8649cd59 | 85 | int buffers_to_export = 0; |
f293009f | 86 | |
08b070db DG |
87 | int ust_clock_source; |
88 | ||
ed1317e7 PMF |
89 | static long long make_pidunique(void) |
90 | { | |
91 | s64 retval; | |
92 | struct timeval tv; | |
72098143 | 93 | |
ed1317e7 PMF |
94 | gettimeofday(&tv, NULL); |
95 | ||
96 | retval = tv.tv_sec; | |
97 | retval <<= 32; | |
98 | retval |= tv.tv_usec; | |
99 | ||
100 | return retval; | |
101 | } | |
102 | ||
52c51a47 | 103 | static void print_markers(FILE *fp) |
fbd8191b PMF |
104 | { |
105 | struct marker_iter iter; | |
106 | ||
d0b5f2b9 | 107 | lock_markers(); |
fbd8191b PMF |
108 | marker_iter_reset(&iter); |
109 | marker_iter_start(&iter); | |
110 | ||
e9b58dc0 | 111 | while (iter.marker) { |
4723ca09 | 112 | fprintf(fp, "marker: %s/%s %d \"%s\" %p\n", |
eb5d20c6 MD |
113 | (*iter.marker)->channel, |
114 | (*iter.marker)->name, | |
115 | (int)imv_read((*iter.marker)->state), | |
116 | (*iter.marker)->format, | |
117 | (*iter.marker)->location); | |
fbd8191b PMF |
118 | marker_iter_next(&iter); |
119 | } | |
d0b5f2b9 | 120 | unlock_markers(); |
fbd8191b PMF |
121 | } |
122 | ||
a3adfb05 NC |
123 | static void print_trace_events(FILE *fp) |
124 | { | |
125 | struct trace_event_iter iter; | |
126 | ||
127 | lock_trace_events(); | |
128 | trace_event_iter_reset(&iter); | |
129 | trace_event_iter_start(&iter); | |
130 | ||
e9b58dc0 | 131 | while (iter.trace_event) { |
fc1caebc | 132 | fprintf(fp, "trace_event: %s\n", (*iter.trace_event)->name); |
a3adfb05 NC |
133 | trace_event_iter_next(&iter); |
134 | } | |
135 | unlock_trace_events(); | |
136 | } | |
137 | ||
9dc7b7ff | 138 | static int connect_ustconsumer(void) |
72098143 NC |
139 | { |
140 | int result, fd; | |
9dc7b7ff | 141 | char default_daemon_path[] = SOCK_DIR "/ustconsumer"; |
72098143 NC |
142 | char *explicit_daemon_path, *daemon_path; |
143 | ||
144 | explicit_daemon_path = getenv("UST_DAEMON_SOCKET"); | |
145 | if (explicit_daemon_path) { | |
146 | daemon_path = explicit_daemon_path; | |
147 | } else { | |
148 | daemon_path = default_daemon_path; | |
149 | } | |
150 | ||
151 | DBG("Connecting to daemon_path %s", daemon_path); | |
152 | ||
153 | result = ustcomm_connect_path(daemon_path, &fd); | |
154 | if (result < 0) { | |
9dc7b7ff | 155 | WARN("connect_ustconsumer failed, daemon_path: %s", |
72098143 NC |
156 | daemon_path); |
157 | return result; | |
158 | } | |
159 | ||
160 | return fd; | |
161 | } | |
162 | ||
163 | ||
164 | static void request_buffer_consumer(int sock, | |
d89b8191 NC |
165 | const char *trace, |
166 | const char *channel, | |
167 | int cpu) | |
72098143 NC |
168 | { |
169 | struct ustcomm_header send_header, recv_header; | |
170 | struct ustcomm_buffer_info buf_inf; | |
171 | int result = 0; | |
172 | ||
173 | result = ustcomm_pack_buffer_info(&send_header, | |
174 | &buf_inf, | |
d89b8191 | 175 | trace, |
72098143 NC |
176 | channel, |
177 | cpu); | |
178 | ||
179 | if (result < 0) { | |
180 | ERR("failed to pack buffer info message %s_%d", | |
181 | channel, cpu); | |
182 | return; | |
183 | } | |
184 | ||
185 | buf_inf.pid = getpid(); | |
186 | send_header.command = CONSUME_BUFFER; | |
187 | ||
188 | result = ustcomm_req(sock, &send_header, (char *) &buf_inf, | |
189 | &recv_header, NULL); | |
190 | if (result <= 0) { | |
191 | PERROR("request for buffer consumer failed, is the daemon online?"); | |
192 | } | |
193 | ||
194 | return; | |
195 | } | |
196 | ||
ad45e833 PMF |
197 | /* Ask the daemon to collect a trace called trace_name and being |
198 | * produced by this pid. | |
199 | * | |
200 | * The trace must be at least allocated. (It can also be started.) | |
201 | * This is because _ltt_trace_find is used. | |
202 | */ | |
203 | ||
204 | static void inform_consumer_daemon(const char *trace_name) | |
d0b5f2b9 | 205 | { |
72098143 | 206 | int sock, i,j; |
b73a4c47 | 207 | struct ust_trace *trace; |
72098143 NC |
208 | const char *ch_name; |
209 | ||
9dc7b7ff | 210 | sock = connect_ustconsumer(); |
72098143 NC |
211 | if (sock < 0) { |
212 | return; | |
213 | } | |
214 | ||
9dc7b7ff | 215 | DBG("Connected to ustconsumer"); |
ad45e833 PMF |
216 | |
217 | ltt_lock_traces(); | |
218 | ||
219 | trace = _ltt_trace_find(trace_name); | |
e9b58dc0 | 220 | if (trace == NULL) { |
ad45e833 | 221 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); |
72098143 | 222 | goto unlock_traces; |
ad45e833 PMF |
223 | } |
224 | ||
e9b58dc0 DS |
225 | for (i=0; i < trace->nr_channels; i++) { |
226 | if (trace->channels[i].request_collection) { | |
8649cd59 | 227 | /* iterate on all cpus */ |
e9b58dc0 | 228 | for (j=0; j<trace->channels[i].n_cpus; j++) { |
72098143 | 229 | ch_name = trace->channels[i].channel_name; |
d89b8191 NC |
230 | request_buffer_consumer(sock, trace_name, |
231 | ch_name, j); | |
0222e121 MD |
232 | CMM_STORE_SHARED(buffers_to_export, |
233 | CMM_LOAD_SHARED(buffers_to_export)+1); | |
204141ee | 234 | } |
ad45e833 PMF |
235 | } |
236 | } | |
237 | ||
72098143 | 238 | unlock_traces: |
ad45e833 | 239 | ltt_unlock_traces(); |
204141ee | 240 | |
72098143 | 241 | close(sock); |
204141ee PMF |
242 | } |
243 | ||
72098143 NC |
244 | static struct ust_channel *find_channel(const char *ch_name, |
245 | struct ust_trace *trace) | |
204141ee | 246 | { |
204141ee | 247 | int i; |
204141ee | 248 | |
e9b58dc0 | 249 | for (i=0; i<trace->nr_channels; i++) { |
e9b58dc0 | 250 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
72098143 | 251 | return &trace->channels[i]; |
204141ee PMF |
252 | } |
253 | } | |
254 | ||
72098143 | 255 | return NULL; |
204141ee PMF |
256 | } |
257 | ||
72098143 NC |
258 | static int get_buffer_shmid_pipe_fd(const char *trace_name, const char *ch_name, |
259 | int ch_cpu, | |
260 | int *buf_shmid, | |
261 | int *buf_struct_shmid, | |
262 | int *buf_pipe_fd) | |
204141ee | 263 | { |
b73a4c47 | 264 | struct ust_trace *trace; |
72098143 NC |
265 | struct ust_channel *channel; |
266 | struct ust_buffer *buf; | |
204141ee | 267 | |
72098143 | 268 | DBG("get_buffer_shmid_pipe_fd"); |
204141ee PMF |
269 | |
270 | ltt_lock_traces(); | |
271 | trace = _ltt_trace_find(trace_name); | |
272 | ltt_unlock_traces(); | |
273 | ||
e9b58dc0 | 274 | if (trace == NULL) { |
204141ee | 275 | ERR("cannot find trace!"); |
72098143 | 276 | return -ENODATA; |
204141ee PMF |
277 | } |
278 | ||
72098143 NC |
279 | channel = find_channel(ch_name, trace); |
280 | if (!channel) { | |
281 | ERR("cannot find channel %s!", ch_name); | |
282 | return -ENODATA; | |
204141ee PMF |
283 | } |
284 | ||
72098143 | 285 | buf = channel->buf[ch_cpu]; |
204141ee | 286 | |
72098143 NC |
287 | *buf_shmid = buf->shmid; |
288 | *buf_struct_shmid = channel->buf_struct_shmids[ch_cpu]; | |
289 | *buf_pipe_fd = buf->data_ready_fd_read; | |
290 | ||
291 | return 0; | |
204141ee PMF |
292 | } |
293 | ||
72098143 NC |
294 | static int get_subbuf_num_size(const char *trace_name, const char *ch_name, |
295 | int *num, int *size) | |
204141ee | 296 | { |
b73a4c47 | 297 | struct ust_trace *trace; |
72098143 | 298 | struct ust_channel *channel; |
204141ee PMF |
299 | |
300 | DBG("get_subbuf_size"); | |
301 | ||
204141ee PMF |
302 | ltt_lock_traces(); |
303 | trace = _ltt_trace_find(trace_name); | |
304 | ltt_unlock_traces(); | |
305 | ||
72098143 | 306 | if (!trace) { |
204141ee | 307 | ERR("cannot find trace!"); |
72098143 | 308 | return -ENODATA; |
204141ee PMF |
309 | } |
310 | ||
72098143 NC |
311 | channel = find_channel(ch_name, trace); |
312 | if (!channel) { | |
27e84572 | 313 | ERR("unable to find channel"); |
72098143 | 314 | return -ENODATA; |
204141ee PMF |
315 | } |
316 | ||
72098143 NC |
317 | *num = channel->subbuf_cnt; |
318 | *size = channel->subbuf_size; | |
204141ee | 319 | |
72098143 | 320 | return 0; |
204141ee PMF |
321 | } |
322 | ||
a80e6dd8 | 323 | /* Return the power of two which is equal or higher to v */ |
763f41e5 | 324 | |
a80e6dd8 PMF |
325 | static unsigned int pow2_higher_or_eq(unsigned int v) |
326 | { | |
327 | int hb = fls(v); | |
a80e6dd8 PMF |
328 | int retval = 1<<(hb-1); |
329 | ||
e9b58dc0 | 330 | if (v-retval == 0) |
a80e6dd8 PMF |
331 | return retval; |
332 | else | |
333 | return retval<<1; | |
763f41e5 DS |
334 | } |
335 | ||
72098143 NC |
336 | static int set_subbuf_size(const char *trace_name, const char *ch_name, |
337 | unsigned int size) | |
763f41e5 | 338 | { |
72098143 | 339 | unsigned int power; |
763f41e5 DS |
340 | int retval = 0; |
341 | struct ust_trace *trace; | |
72098143 | 342 | struct ust_channel *channel; |
763f41e5 DS |
343 | |
344 | DBG("set_subbuf_size"); | |
345 | ||
a80e6dd8 PMF |
346 | power = pow2_higher_or_eq(size); |
347 | power = max_t(unsigned int, 2u, power); | |
72098143 | 348 | if (power != size) { |
a80e6dd8 | 349 | WARN("using the next power of two for buffer size = %u\n", power); |
72098143 | 350 | } |
763f41e5 DS |
351 | |
352 | ltt_lock_traces(); | |
353 | trace = _ltt_trace_find_setup(trace_name); | |
e9b58dc0 | 354 | if (trace == NULL) { |
763f41e5 | 355 | ERR("cannot find trace!"); |
72098143 NC |
356 | retval = -ENODATA; |
357 | goto unlock_traces; | |
763f41e5 DS |
358 | } |
359 | ||
72098143 NC |
360 | channel = find_channel(ch_name, trace); |
361 | if (!channel) { | |
763f41e5 | 362 | ERR("unable to find channel"); |
72098143 NC |
363 | retval = -ENODATA; |
364 | goto unlock_traces; | |
763f41e5 DS |
365 | } |
366 | ||
72098143 | 367 | channel->subbuf_size = power; |
fbae86d6 | 368 | DBG("the set_subbuf_size for the requested channel is %zu", channel->subbuf_size); |
72098143 NC |
369 | |
370 | unlock_traces: | |
86dd0ebc | 371 | ltt_unlock_traces(); |
72098143 | 372 | |
763f41e5 DS |
373 | return retval; |
374 | } | |
375 | ||
72098143 NC |
376 | static int set_subbuf_num(const char *trace_name, const char *ch_name, |
377 | unsigned int num) | |
763f41e5 | 378 | { |
763f41e5 | 379 | struct ust_trace *trace; |
72098143 NC |
380 | struct ust_channel *channel; |
381 | int retval = 0; | |
763f41e5 DS |
382 | |
383 | DBG("set_subbuf_num"); | |
384 | ||
763f41e5 DS |
385 | if (num < 2) { |
386 | ERR("subbuffer count should be greater than 2"); | |
72098143 | 387 | return -EINVAL; |
763f41e5 DS |
388 | } |
389 | ||
390 | ltt_lock_traces(); | |
391 | trace = _ltt_trace_find_setup(trace_name); | |
e9b58dc0 | 392 | if (trace == NULL) { |
763f41e5 | 393 | ERR("cannot find trace!"); |
72098143 NC |
394 | retval = -ENODATA; |
395 | goto unlock_traces; | |
763f41e5 DS |
396 | } |
397 | ||
72098143 NC |
398 | channel = find_channel(ch_name, trace); |
399 | if (!channel) { | |
763f41e5 | 400 | ERR("unable to find channel"); |
72098143 NC |
401 | retval = -ENODATA; |
402 | goto unlock_traces; | |
763f41e5 DS |
403 | } |
404 | ||
72098143 | 405 | channel->subbuf_cnt = num; |
fbae86d6 | 406 | DBG("the set_subbuf_cnt for the requested channel is %u", channel->subbuf_cnt); |
72098143 NC |
407 | |
408 | unlock_traces: | |
86dd0ebc | 409 | ltt_unlock_traces(); |
763f41e5 DS |
410 | return retval; |
411 | } | |
412 | ||
72098143 NC |
413 | static int get_subbuffer(const char *trace_name, const char *ch_name, |
414 | int ch_cpu, long *consumed_old) | |
4723ca09 | 415 | { |
72098143 | 416 | int retval = 0; |
4723ca09 | 417 | struct ust_trace *trace; |
72098143 NC |
418 | struct ust_channel *channel; |
419 | struct ust_buffer *buf; | |
4723ca09 NC |
420 | |
421 | DBG("get_subbuf"); | |
422 | ||
72098143 | 423 | *consumed_old = 0; |
4723ca09 NC |
424 | |
425 | ltt_lock_traces(); | |
426 | trace = _ltt_trace_find(trace_name); | |
427 | ||
72098143 | 428 | if (!trace) { |
4723ca09 | 429 | DBG("Cannot find trace. It was likely destroyed by the user."); |
72098143 | 430 | retval = -ENODATA; |
4723ca09 NC |
431 | goto unlock_traces; |
432 | } | |
433 | ||
72098143 NC |
434 | channel = find_channel(ch_name, trace); |
435 | if (!channel) { | |
436 | ERR("unable to find channel"); | |
437 | retval = -ENODATA; | |
438 | goto unlock_traces; | |
4723ca09 | 439 | } |
4723ca09 | 440 | |
72098143 NC |
441 | buf = channel->buf[ch_cpu]; |
442 | ||
443 | retval = ust_buffers_get_subbuf(buf, consumed_old); | |
444 | if (retval < 0) { | |
445 | WARN("missed buffer?"); | |
4723ca09 NC |
446 | } |
447 | ||
72098143 | 448 | unlock_traces: |
4723ca09 NC |
449 | ltt_unlock_traces(); |
450 | ||
4723ca09 NC |
451 | return retval; |
452 | } | |
453 | ||
454 | ||
72098143 NC |
455 | static int notify_buffer_mapped(const char *trace_name, |
456 | const char *ch_name, | |
457 | int ch_cpu) | |
204141ee PMF |
458 | { |
459 | int retval = 0; | |
b73a4c47 | 460 | struct ust_trace *trace; |
72098143 NC |
461 | struct ust_channel *channel; |
462 | struct ust_buffer *buf; | |
204141ee | 463 | |
4723ca09 | 464 | DBG("get_buffer_fd"); |
204141ee | 465 | |
204141ee PMF |
466 | ltt_lock_traces(); |
467 | trace = _ltt_trace_find(trace_name); | |
204141ee | 468 | |
72098143 NC |
469 | if (!trace) { |
470 | retval = -ENODATA; | |
753e1b51 | 471 | DBG("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 472 | goto unlock_traces; |
204141ee PMF |
473 | } |
474 | ||
72098143 NC |
475 | channel = find_channel(ch_name, trace); |
476 | if (!channel) { | |
477 | retval = -ENODATA; | |
478 | ERR("unable to find channel"); | |
479 | goto unlock_traces; | |
480 | } | |
204141ee | 481 | |
72098143 | 482 | buf = channel->buf[ch_cpu]; |
d5adede0 | 483 | |
72098143 NC |
484 | /* Being here is the proof the daemon has mapped the buffer in its |
485 | * memory. We may now decrement buffers_to_export. | |
486 | */ | |
487 | if (uatomic_read(&buf->consumed) == 0) { | |
488 | DBG("decrementing buffers_to_export"); | |
0222e121 | 489 | CMM_STORE_SHARED(buffers_to_export, CMM_LOAD_SHARED(buffers_to_export)-1); |
204141ee PMF |
490 | } |
491 | ||
72098143 NC |
492 | /* The buffer has been exported, ergo, we can add it to the |
493 | * list of open buffers | |
494 | */ | |
0222e121 | 495 | cds_list_add(&buf->open_buffers_list, &open_buffers_list); |
86dd0ebc | 496 | |
72098143 NC |
497 | unlock_traces: |
498 | ltt_unlock_traces(); | |
204141ee | 499 | |
204141ee PMF |
500 | return retval; |
501 | } | |
502 | ||
72098143 NC |
503 | static int put_subbuffer(const char *trace_name, const char *ch_name, |
504 | int ch_cpu, long consumed_old) | |
204141ee PMF |
505 | { |
506 | int retval = 0; | |
b73a4c47 | 507 | struct ust_trace *trace; |
72098143 NC |
508 | struct ust_channel *channel; |
509 | struct ust_buffer *buf; | |
204141ee PMF |
510 | |
511 | DBG("put_subbuf"); | |
512 | ||
204141ee PMF |
513 | ltt_lock_traces(); |
514 | trace = _ltt_trace_find(trace_name); | |
204141ee | 515 | |
72098143 NC |
516 | if (!trace) { |
517 | retval = -ENODATA; | |
753e1b51 | 518 | DBG("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 519 | goto unlock_traces; |
204141ee PMF |
520 | } |
521 | ||
72098143 NC |
522 | channel = find_channel(ch_name, trace); |
523 | if (!channel) { | |
524 | retval = -ENODATA; | |
525 | ERR("unable to find channel"); | |
526 | goto unlock_traces; | |
527 | } | |
204141ee | 528 | |
72098143 | 529 | buf = channel->buf[ch_cpu]; |
204141ee | 530 | |
72098143 NC |
531 | retval = ust_buffers_put_subbuf(buf, consumed_old); |
532 | if (retval < 0) { | |
533 | WARN("ust_buffers_put_subbuf: error (subbuf=%s_%d)", | |
534 | ch_name, ch_cpu); | |
535 | } else { | |
536 | DBG("ust_buffers_put_subbuf: success (subbuf=%s_%d)", | |
537 | ch_name, ch_cpu); | |
204141ee PMF |
538 | } |
539 | ||
72098143 | 540 | unlock_traces: |
86dd0ebc | 541 | ltt_unlock_traces(); |
72098143 | 542 | |
204141ee PMF |
543 | return retval; |
544 | } | |
545 | ||
fc253ce0 PMF |
546 | static void listener_cleanup(void *ptr) |
547 | { | |
fd9c2963 MD |
548 | pthread_mutex_lock(&listen_sock_mutex); |
549 | if (listen_sock) { | |
550 | ustcomm_del_named_sock(listen_sock, 0); | |
551 | listen_sock = NULL; | |
552 | } | |
553 | pthread_mutex_unlock(&listen_sock_mutex); | |
fc253ce0 PMF |
554 | } |
555 | ||
72098143 | 556 | static void force_subbuf_switch() |
b9318b35 | 557 | { |
4723ca09 | 558 | struct ust_buffer *buf; |
b9318b35 | 559 | |
0222e121 | 560 | cds_list_for_each_entry(buf, &open_buffers_list, |
4723ca09 NC |
561 | open_buffers_list) { |
562 | ltt_force_switch(buf, FORCE_FLUSH); | |
b9318b35 AH |
563 | } |
564 | } | |
565 | ||
72098143 NC |
566 | /* Simple commands are those which need only respond with a return value. */ |
567 | static int process_simple_client_cmd(int command, char *recv_buf) | |
98963de4 | 568 | { |
28c1bb40 NC |
569 | int result; |
570 | ||
72098143 NC |
571 | switch(command) { |
572 | case SET_SOCK_PATH: | |
573 | { | |
28c1bb40 NC |
574 | struct ustcomm_single_field *sock_msg; |
575 | sock_msg = (struct ustcomm_single_field *)recv_buf; | |
576 | result = ustcomm_unpack_single_field(sock_msg); | |
577 | if (result < 0) { | |
578 | return result; | |
a3adfb05 | 579 | } |
28c1bb40 | 580 | return setenv("UST_DAEMON_SOCKET", sock_msg->field, 1); |
72098143 | 581 | } |
d89b8191 NC |
582 | |
583 | case FORCE_SUBBUF_SWITCH: | |
584 | /* FIXME: return codes? */ | |
585 | force_subbuf_switch(); | |
586 | ||
587 | break; | |
588 | ||
589 | default: | |
590 | return -EINVAL; | |
591 | } | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | ||
597 | static int process_trace_cmd(int command, char *trace_name) | |
598 | { | |
599 | int result; | |
600 | char trace_type[] = "ustrelay"; | |
601 | ||
602 | switch(command) { | |
72098143 | 603 | case START: |
0e4b45ac PMF |
604 | /* start is an operation that setups the trace, allocates it and starts it */ |
605 | result = ltt_trace_setup(trace_name); | |
e9b58dc0 | 606 | if (result < 0) { |
0e4b45ac | 607 | ERR("ltt_trace_setup failed"); |
72098143 | 608 | return result; |
3a7b90de | 609 | } |
98963de4 | 610 | |
0e4b45ac | 611 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 612 | if (result < 0) { |
0e4b45ac | 613 | ERR("ltt_trace_set_type failed"); |
72098143 | 614 | return result; |
52c51a47 | 615 | } |
52c51a47 | 616 | |
0e4b45ac | 617 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 618 | if (result < 0) { |
0e4b45ac | 619 | ERR("ltt_trace_alloc failed"); |
72098143 | 620 | return result; |
52c51a47 | 621 | } |
52c51a47 | 622 | |
0e4b45ac | 623 | inform_consumer_daemon(trace_name); |
52c51a47 | 624 | |
0e4b45ac | 625 | result = ltt_trace_start(trace_name); |
e9b58dc0 | 626 | if (result < 0) { |
0e4b45ac | 627 | ERR("ltt_trace_start failed"); |
72098143 | 628 | return result; |
d0b5f2b9 | 629 | } |
72098143 NC |
630 | |
631 | return 0; | |
632 | case SETUP_TRACE: | |
0e4b45ac | 633 | DBG("trace setup"); |
d0b5f2b9 | 634 | |
0e4b45ac | 635 | result = ltt_trace_setup(trace_name); |
e9b58dc0 | 636 | if (result < 0) { |
0e4b45ac | 637 | ERR("ltt_trace_setup failed"); |
72098143 | 638 | return result; |
d0b5f2b9 | 639 | } |
d0b5f2b9 | 640 | |
0e4b45ac | 641 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 642 | if (result < 0) { |
0e4b45ac | 643 | ERR("ltt_trace_set_type failed"); |
72098143 | 644 | return result; |
d0b5f2b9 | 645 | } |
72098143 NC |
646 | |
647 | return 0; | |
648 | case ALLOC_TRACE: | |
0e4b45ac | 649 | DBG("trace alloc"); |
62ec620f | 650 | |
0e4b45ac | 651 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 652 | if (result < 0) { |
0e4b45ac | 653 | ERR("ltt_trace_alloc failed"); |
72098143 | 654 | return result; |
763f41e5 | 655 | } |
0e4b45ac | 656 | inform_consumer_daemon(trace_name); |
72098143 NC |
657 | |
658 | return 0; | |
659 | ||
660 | case CREATE_TRACE: | |
0e4b45ac | 661 | DBG("trace create"); |
d0b5f2b9 | 662 | |
0e4b45ac | 663 | result = ltt_trace_setup(trace_name); |
e9b58dc0 | 664 | if (result < 0) { |
0e4b45ac | 665 | ERR("ltt_trace_setup failed"); |
72098143 | 666 | return result; |
d0b5f2b9 | 667 | } |
d0b5f2b9 | 668 | |
0e4b45ac | 669 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 670 | if (result < 0) { |
0e4b45ac | 671 | ERR("ltt_trace_set_type failed"); |
72098143 | 672 | return result; |
d0b5f2b9 | 673 | } |
72098143 NC |
674 | |
675 | return 0; | |
676 | case START_TRACE: | |
0e4b45ac | 677 | DBG("trace start"); |
aafb1650 | 678 | |
0e4b45ac | 679 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 680 | if (result < 0) { |
0e4b45ac | 681 | ERR("ltt_trace_alloc failed"); |
72098143 | 682 | return result; |
811e4b93 | 683 | } |
e9b58dc0 | 684 | if (!result) { |
0e4b45ac | 685 | inform_consumer_daemon(trace_name); |
811e4b93 | 686 | } |
0e4b45ac PMF |
687 | |
688 | result = ltt_trace_start(trace_name); | |
e9b58dc0 | 689 | if (result < 0) { |
0e4b45ac | 690 | ERR("ltt_trace_start failed"); |
72098143 | 691 | return result; |
3847c3ba | 692 | } |
72098143 NC |
693 | |
694 | return 0; | |
695 | case STOP_TRACE: | |
0e4b45ac | 696 | DBG("trace stop"); |
b02e31e5 | 697 | |
0e4b45ac | 698 | result = ltt_trace_stop(trace_name); |
e9b58dc0 | 699 | if (result < 0) { |
0e4b45ac | 700 | ERR("ltt_trace_stop failed"); |
72098143 | 701 | return result; |
0e4b45ac | 702 | } |
b02e31e5 | 703 | |
72098143 NC |
704 | return 0; |
705 | case DESTROY_TRACE: | |
0e4b45ac | 706 | DBG("trace destroy"); |
204141ee | 707 | |
0e4b45ac | 708 | result = ltt_trace_destroy(trace_name, 0); |
e9b58dc0 | 709 | if (result < 0) { |
0e4b45ac | 710 | ERR("ltt_trace_destroy failed"); |
72098143 | 711 | return result; |
763f41e5 | 712 | } |
72098143 | 713 | return 0; |
72098143 NC |
714 | } |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
d89b8191 | 719 | |
72098143 NC |
720 | static void process_channel_cmd(int sock, int command, |
721 | struct ustcomm_channel_info *ch_inf) | |
722 | { | |
723 | struct ustcomm_header _reply_header; | |
724 | struct ustcomm_header *reply_header = &_reply_header; | |
725 | struct ustcomm_channel_info *reply_msg = | |
726 | (struct ustcomm_channel_info *)send_buffer; | |
72098143 NC |
727 | int result, offset = 0, num, size; |
728 | ||
729 | memset(reply_header, 0, sizeof(*reply_header)); | |
730 | ||
731 | switch (command) { | |
732 | case GET_SUBBUF_NUM_SIZE: | |
d89b8191 | 733 | result = get_subbuf_num_size(ch_inf->trace, |
72098143 NC |
734 | ch_inf->channel, |
735 | &num, &size); | |
736 | if (result < 0) { | |
737 | reply_header->result = result; | |
738 | break; | |
739 | } | |
740 | ||
741 | reply_msg->channel = USTCOMM_POISON_PTR; | |
742 | reply_msg->subbuf_num = num; | |
743 | reply_msg->subbuf_size = size; | |
744 | ||
745 | ||
746 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
747 | ||
748 | break; | |
749 | case SET_SUBBUF_NUM: | |
d89b8191 | 750 | reply_header->result = set_subbuf_num(ch_inf->trace, |
72098143 NC |
751 | ch_inf->channel, |
752 | ch_inf->subbuf_num); | |
753 | ||
754 | break; | |
755 | case SET_SUBBUF_SIZE: | |
d89b8191 | 756 | reply_header->result = set_subbuf_size(ch_inf->trace, |
72098143 NC |
757 | ch_inf->channel, |
758 | ch_inf->subbuf_size); | |
759 | ||
760 | ||
761 | break; | |
762 | } | |
763 | if (ustcomm_send(sock, reply_header, (char *)reply_msg) < 0) { | |
764 | ERR("ustcomm_send failed"); | |
765 | } | |
766 | } | |
767 | ||
768 | static void process_buffer_cmd(int sock, int command, | |
769 | struct ustcomm_buffer_info *buf_inf) | |
770 | { | |
771 | struct ustcomm_header _reply_header; | |
772 | struct ustcomm_header *reply_header = &_reply_header; | |
773 | struct ustcomm_buffer_info *reply_msg = | |
774 | (struct ustcomm_buffer_info *)send_buffer; | |
72098143 NC |
775 | int result, offset = 0, buf_shmid, buf_struct_shmid, buf_pipe_fd; |
776 | long consumed_old; | |
52c51a47 | 777 | |
72098143 NC |
778 | memset(reply_header, 0, sizeof(*reply_header)); |
779 | ||
780 | switch (command) { | |
781 | case GET_BUF_SHMID_PIPE_FD: | |
d89b8191 NC |
782 | result = get_buffer_shmid_pipe_fd(buf_inf->trace, |
783 | buf_inf->channel, | |
72098143 NC |
784 | buf_inf->ch_cpu, |
785 | &buf_shmid, | |
786 | &buf_struct_shmid, | |
787 | &buf_pipe_fd); | |
788 | if (result < 0) { | |
789 | reply_header->result = result; | |
790 | break; | |
52c51a47 | 791 | } |
52c51a47 | 792 | |
72098143 NC |
793 | reply_msg->channel = USTCOMM_POISON_PTR; |
794 | reply_msg->buf_shmid = buf_shmid; | |
795 | reply_msg->buf_struct_shmid = buf_struct_shmid; | |
796 | ||
797 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
798 | reply_header->fd_included = 1; | |
799 | ||
800 | if (ustcomm_send_fd(sock, reply_header, (char *)reply_msg, | |
801 | &buf_pipe_fd) < 0) { | |
802 | ERR("ustcomm_send failed"); | |
803 | } | |
804 | return; | |
805 | ||
806 | case NOTIFY_BUF_MAPPED: | |
807 | reply_header->result = | |
d89b8191 | 808 | notify_buffer_mapped(buf_inf->trace, |
72098143 NC |
809 | buf_inf->channel, |
810 | buf_inf->ch_cpu); | |
811 | break; | |
812 | case GET_SUBBUFFER: | |
d89b8191 | 813 | result = get_subbuffer(buf_inf->trace, buf_inf->channel, |
72098143 | 814 | buf_inf->ch_cpu, &consumed_old); |
e9b58dc0 | 815 | if (result < 0) { |
72098143 NC |
816 | reply_header->result = result; |
817 | break; | |
0e4b45ac | 818 | } |
c5ff938a | 819 | |
72098143 NC |
820 | reply_msg->channel = USTCOMM_POISON_PTR; |
821 | reply_msg->consumed_old = consumed_old; | |
822 | ||
823 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
824 | ||
825 | break; | |
826 | case PUT_SUBBUFFER: | |
d89b8191 | 827 | result = put_subbuffer(buf_inf->trace, buf_inf->channel, |
72098143 NC |
828 | buf_inf->ch_cpu, |
829 | buf_inf->consumed_old); | |
830 | reply_header->result = result; | |
831 | ||
832 | break; | |
833 | } | |
834 | ||
835 | if (ustcomm_send(sock, reply_header, (char *)reply_msg) < 0) { | |
836 | ERR("ustcomm_send failed"); | |
837 | } | |
838 | ||
839 | } | |
840 | ||
841 | static void process_marker_cmd(int sock, int command, | |
842 | struct ustcomm_marker_info *marker_inf) | |
843 | { | |
844 | struct ustcomm_header _reply_header; | |
845 | struct ustcomm_header *reply_header = &_reply_header; | |
e2b46575 | 846 | int result = 0; |
52c51a47 | 847 | |
72098143 NC |
848 | memset(reply_header, 0, sizeof(*reply_header)); |
849 | ||
850 | switch(command) { | |
851 | case ENABLE_MARKER: | |
852 | ||
853 | result = ltt_marker_connect(marker_inf->channel, | |
854 | marker_inf->marker, | |
855 | "default"); | |
856 | if (result < 0) { | |
857 | WARN("could not enable marker; channel=%s," | |
858 | " name=%s", | |
859 | marker_inf->channel, | |
860 | marker_inf->marker); | |
52c51a47 | 861 | |
52c51a47 | 862 | } |
72098143 NC |
863 | break; |
864 | case DISABLE_MARKER: | |
865 | result = ltt_marker_disconnect(marker_inf->channel, | |
866 | marker_inf->marker, | |
867 | "default"); | |
868 | if (result < 0) { | |
869 | WARN("could not disable marker; channel=%s," | |
870 | " name=%s", | |
871 | marker_inf->channel, | |
872 | marker_inf->marker); | |
873 | } | |
874 | break; | |
875 | } | |
ed1317e7 | 876 | |
72098143 NC |
877 | reply_header->result = result; |
878 | ||
879 | if (ustcomm_send(sock, reply_header, NULL) < 0) { | |
880 | ERR("ustcomm_send failed"); | |
881 | } | |
882 | ||
883 | } | |
884 | static void process_client_cmd(struct ustcomm_header *recv_header, | |
885 | char *recv_buf, int sock) | |
886 | { | |
887 | int result; | |
888 | struct ustcomm_header _reply_header; | |
889 | struct ustcomm_header *reply_header = &_reply_header; | |
890 | char *send_buf = send_buffer; | |
891 | ||
892 | memset(reply_header, 0, sizeof(*reply_header)); | |
893 | memset(send_buf, 0, sizeof(send_buffer)); | |
894 | ||
895 | switch(recv_header->command) { | |
896 | case GET_SUBBUF_NUM_SIZE: | |
897 | case SET_SUBBUF_NUM: | |
898 | case SET_SUBBUF_SIZE: | |
899 | { | |
900 | struct ustcomm_channel_info *ch_inf; | |
901 | ch_inf = (struct ustcomm_channel_info *)recv_buf; | |
902 | result = ustcomm_unpack_channel_info(ch_inf); | |
903 | if (result < 0) { | |
904 | ERR("couldn't unpack channel info"); | |
905 | reply_header->result = -EINVAL; | |
906 | goto send_response; | |
907 | } | |
908 | process_channel_cmd(sock, recv_header->command, ch_inf); | |
909 | return; | |
910 | } | |
911 | case GET_BUF_SHMID_PIPE_FD: | |
912 | case NOTIFY_BUF_MAPPED: | |
913 | case GET_SUBBUFFER: | |
914 | case PUT_SUBBUFFER: | |
915 | { | |
916 | struct ustcomm_buffer_info *buf_inf; | |
917 | buf_inf = (struct ustcomm_buffer_info *)recv_buf; | |
918 | result = ustcomm_unpack_buffer_info(buf_inf); | |
919 | if (result < 0) { | |
920 | ERR("couldn't unpack buffer info"); | |
921 | reply_header->result = -EINVAL; | |
922 | goto send_response; | |
923 | } | |
924 | process_buffer_cmd(sock, recv_header->command, buf_inf); | |
925 | return; | |
926 | } | |
927 | case ENABLE_MARKER: | |
928 | case DISABLE_MARKER: | |
929 | { | |
930 | struct ustcomm_marker_info *marker_inf; | |
931 | marker_inf = (struct ustcomm_marker_info *)recv_buf; | |
932 | result = ustcomm_unpack_marker_info(marker_inf); | |
e9b58dc0 | 933 | if (result < 0) { |
72098143 NC |
934 | ERR("couldn't unpack marker info"); |
935 | reply_header->result = -EINVAL; | |
936 | goto send_response; | |
0e4b45ac | 937 | } |
72098143 NC |
938 | process_marker_cmd(sock, recv_header->command, marker_inf); |
939 | return; | |
940 | } | |
941 | case LIST_MARKERS: | |
942 | { | |
943 | char *ptr; | |
944 | size_t size; | |
945 | FILE *fp; | |
c5ff938a | 946 | |
72098143 NC |
947 | fp = open_memstream(&ptr, &size); |
948 | if (fp == NULL) { | |
949 | ERR("opening memstream failed"); | |
950 | return; | |
951 | } | |
952 | print_markers(fp); | |
953 | fclose(fp); | |
ed1317e7 | 954 | |
72098143 NC |
955 | reply_header->size = size; |
956 | ||
957 | result = ustcomm_send(sock, reply_header, ptr); | |
958 | ||
959 | free(ptr); | |
960 | ||
961 | if (result < 0) { | |
962 | PERROR("failed to send markers list"); | |
963 | } | |
964 | ||
965 | break; | |
966 | } | |
967 | case LIST_TRACE_EVENTS: | |
968 | { | |
969 | char *ptr; | |
970 | size_t size; | |
971 | FILE *fp; | |
972 | ||
973 | fp = open_memstream(&ptr, &size); | |
974 | if (fp == NULL) { | |
975 | ERR("opening memstream failed"); | |
976 | return; | |
08b8805e | 977 | } |
72098143 NC |
978 | print_trace_events(fp); |
979 | fclose(fp); | |
980 | ||
981 | reply_header->size = size; | |
982 | ||
983 | result = ustcomm_send(sock, reply_header, ptr); | |
ed1317e7 | 984 | |
72098143 NC |
985 | free(ptr); |
986 | ||
987 | if (result < 0) { | |
988 | ERR("list_trace_events failed"); | |
989 | return; | |
ed1317e7 | 990 | } |
0e4b45ac | 991 | |
72098143 NC |
992 | break; |
993 | } | |
994 | case LOAD_PROBE_LIB: | |
995 | { | |
996 | char *libfile; | |
997 | ||
998 | /* FIXME: No functionality at all... */ | |
999 | libfile = recv_buf; | |
1000 | ||
1001 | DBG("load_probe_lib loading %s", libfile); | |
1002 | ||
1003 | break; | |
1004 | } | |
1005 | case GET_PIDUNIQUE: | |
1006 | { | |
1007 | struct ustcomm_pidunique *pid_msg; | |
1008 | pid_msg = (struct ustcomm_pidunique *)send_buf; | |
1009 | ||
1010 | pid_msg->pidunique = pidunique; | |
1011 | reply_header->size = sizeof(pid_msg); | |
1012 | ||
1013 | goto send_response; | |
1014 | ||
1015 | } | |
1016 | case GET_SOCK_PATH: | |
1017 | { | |
28c1bb40 | 1018 | struct ustcomm_single_field *sock_msg; |
72098143 NC |
1019 | char *sock_path_env; |
1020 | ||
28c1bb40 | 1021 | sock_msg = (struct ustcomm_single_field *)send_buf; |
72098143 NC |
1022 | |
1023 | sock_path_env = getenv("UST_DAEMON_SOCKET"); | |
1024 | ||
1025 | if (!sock_path_env) { | |
28c1bb40 NC |
1026 | result = ustcomm_pack_single_field(reply_header, |
1027 | sock_msg, | |
9dc7b7ff | 1028 | SOCK_DIR "/ustconsumer"); |
72098143 | 1029 | |
e9b58dc0 | 1030 | } else { |
28c1bb40 NC |
1031 | result = ustcomm_pack_single_field(reply_header, |
1032 | sock_msg, | |
1033 | sock_path_env); | |
b2fb2f91 | 1034 | } |
72098143 NC |
1035 | reply_header->result = result; |
1036 | ||
1037 | goto send_response; | |
0e4b45ac | 1038 | } |
d89b8191 NC |
1039 | case START: |
1040 | case SETUP_TRACE: | |
1041 | case ALLOC_TRACE: | |
1042 | case CREATE_TRACE: | |
1043 | case START_TRACE: | |
1044 | case STOP_TRACE: | |
1045 | case DESTROY_TRACE: | |
1046 | { | |
28c1bb40 NC |
1047 | struct ustcomm_single_field *trace_inf = |
1048 | (struct ustcomm_single_field *)recv_buf; | |
d89b8191 | 1049 | |
28c1bb40 | 1050 | result = ustcomm_unpack_single_field(trace_inf); |
d89b8191 NC |
1051 | if (result < 0) { |
1052 | ERR("couldn't unpack trace info"); | |
1053 | reply_header->result = -EINVAL; | |
1054 | goto send_response; | |
1055 | } | |
1056 | ||
1057 | reply_header->result = | |
1058 | process_trace_cmd(recv_header->command, | |
28c1bb40 | 1059 | trace_inf->field); |
d89b8191 NC |
1060 | goto send_response; |
1061 | ||
1062 | } | |
72098143 NC |
1063 | default: |
1064 | reply_header->result = | |
1065 | process_simple_client_cmd(recv_header->command, | |
1066 | recv_buf); | |
1067 | goto send_response; | |
0e4b45ac | 1068 | |
72098143 | 1069 | } |
0e4b45ac | 1070 | |
72098143 NC |
1071 | return; |
1072 | ||
1073 | send_response: | |
1074 | ustcomm_send(sock, reply_header, send_buf); | |
0e4b45ac PMF |
1075 | } |
1076 | ||
4723ca09 NC |
1077 | #define MAX_EVENTS 10 |
1078 | ||
0e4b45ac PMF |
1079 | void *listener_main(void *p) |
1080 | { | |
4723ca09 NC |
1081 | struct ustcomm_sock *epoll_sock; |
1082 | struct epoll_event events[MAX_EVENTS]; | |
1083 | struct sockaddr addr; | |
1084 | int accept_fd, nfds, result, i, addr_size; | |
0e4b45ac PMF |
1085 | |
1086 | DBG("LISTENER"); | |
1087 | ||
1088 | pthread_cleanup_push(listener_cleanup, NULL); | |
1089 | ||
4723ca09 NC |
1090 | for(;;) { |
1091 | nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1); | |
1092 | if (nfds == -1) { | |
1093 | PERROR("listener_main: epoll_wait failed"); | |
1094 | continue; | |
688760ef | 1095 | } |
d0b5f2b9 | 1096 | |
4723ca09 | 1097 | for (i = 0; i < nfds; i++) { |
fd9c2963 | 1098 | pthread_mutex_lock(&listener_thread_data_mutex); |
4723ca09 NC |
1099 | epoll_sock = (struct ustcomm_sock *)events[i].data.ptr; |
1100 | if (epoll_sock == listen_sock) { | |
1101 | addr_size = sizeof(struct sockaddr); | |
1102 | accept_fd = accept(epoll_sock->fd, | |
1103 | &addr, | |
1104 | (socklen_t *)&addr_size); | |
1105 | if (accept_fd == -1) { | |
1106 | PERROR("listener_main: accept failed"); | |
1107 | continue; | |
1108 | } | |
1109 | ustcomm_init_sock(accept_fd, epoll_fd, | |
1110 | &ust_socks); | |
1111 | } else { | |
72098143 NC |
1112 | memset(receive_header, 0, |
1113 | sizeof(*receive_header)); | |
1114 | memset(receive_buffer, 0, | |
1115 | sizeof(receive_buffer)); | |
1116 | result = ustcomm_recv(epoll_sock->fd, | |
1117 | receive_header, | |
1118 | receive_buffer); | |
4723ca09 NC |
1119 | if (result == 0) { |
1120 | ustcomm_del_sock(epoll_sock, 0); | |
72098143 NC |
1121 | } else { |
1122 | process_client_cmd(receive_header, | |
1123 | receive_buffer, | |
1124 | epoll_sock->fd); | |
4723ca09 NC |
1125 | } |
1126 | } | |
fd9c2963 | 1127 | pthread_mutex_unlock(&listener_thread_data_mutex); |
4723ca09 | 1128 | } |
98963de4 | 1129 | } |
fc253ce0 PMF |
1130 | |
1131 | pthread_cleanup_pop(1); | |
98963de4 PMF |
1132 | } |
1133 | ||
cd03ff7f PMF |
1134 | /* These should only be accessed in the parent thread, |
1135 | * not the listener. | |
1136 | */ | |
ce45335c | 1137 | static volatile sig_atomic_t have_listener = 0; |
fc253ce0 | 1138 | static pthread_t listener_thread; |
4440ebcb | 1139 | |
98963de4 PMF |
1140 | void create_listener(void) |
1141 | { | |
c5fdc888 | 1142 | int result; |
f51d84ea PMF |
1143 | sigset_t sig_all_blocked; |
1144 | sigset_t orig_parent_mask; | |
98963de4 | 1145 | |
e9b58dc0 | 1146 | if (have_listener) { |
c5fdc888 | 1147 | WARN("not creating listener because we already had one"); |
4440ebcb | 1148 | return; |
c5fdc888 | 1149 | } |
4440ebcb | 1150 | |
f51d84ea PMF |
1151 | /* A new thread created by pthread_create inherits the signal mask |
1152 | * from the parent. To avoid any signal being received by the | |
1153 | * listener thread, we block all signals temporarily in the parent, | |
1154 | * while we create the listener thread. | |
1155 | */ | |
1156 | ||
1157 | sigfillset(&sig_all_blocked); | |
1158 | ||
1159 | result = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_parent_mask); | |
e9b58dc0 | 1160 | if (result) { |
f51d84ea PMF |
1161 | PERROR("pthread_sigmask: %s", strerror(result)); |
1162 | } | |
1163 | ||
cd03ff7f | 1164 | result = pthread_create(&listener_thread, NULL, listener_main, NULL); |
e9b58dc0 | 1165 | if (result == -1) { |
cd03ff7f | 1166 | PERROR("pthread_create"); |
98963de4 | 1167 | } |
4440ebcb | 1168 | |
f51d84ea PMF |
1169 | /* Restore original signal mask in parent */ |
1170 | result = pthread_sigmask(SIG_SETMASK, &orig_parent_mask, NULL); | |
e9b58dc0 | 1171 | if (result) { |
f51d84ea | 1172 | PERROR("pthread_sigmask: %s", strerror(result)); |
e9b58dc0 | 1173 | } else { |
4267e589 PMF |
1174 | have_listener = 1; |
1175 | } | |
98963de4 PMF |
1176 | } |
1177 | ||
5de74e51 PMF |
1178 | #define AUTOPROBE_DISABLED 0 |
1179 | #define AUTOPROBE_ENABLE_ALL 1 | |
1180 | #define AUTOPROBE_ENABLE_REGEX 2 | |
1181 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
1182 | static regex_t autoprobe_regex; | |
ef290fca | 1183 | |
20b37a31 | 1184 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
1185 | { |
1186 | int result; | |
1187 | ||
5de74e51 PMF |
1188 | char* concat_name = NULL; |
1189 | const char *probe_name = "default"; | |
ef290fca | 1190 | |
e9b58dc0 | 1191 | if (autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca | 1192 | return; |
e9b58dc0 | 1193 | } else if (autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
5de74e51 | 1194 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); |
e9b58dc0 | 1195 | if (result == -1) { |
5de74e51 PMF |
1196 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", |
1197 | m->channel, m->name); | |
1198 | return; | |
1199 | } | |
1200 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
1201 | free(concat_name); | |
1202 | return; | |
1203 | } | |
1204 | free(concat_name); | |
ef290fca PMF |
1205 | } |
1206 | ||
5de74e51 | 1207 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
e9b58dc0 | 1208 | if (result && result != -EEXIST) |
acbf228b | 1209 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); |
20b37a31 | 1210 | |
3ea1e2fc | 1211 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
ef290fca | 1212 | |
20b37a31 PMF |
1213 | } |
1214 | ||
4723ca09 NC |
1215 | static struct ustcomm_sock * init_app_socket(int epoll_fd) |
1216 | { | |
1217 | char *name; | |
1218 | int result; | |
1219 | struct ustcomm_sock *sock; | |
1220 | ||
1221 | result = asprintf(&name, "%s/%d", SOCK_DIR, (int)getpid()); | |
1222 | if (result < 0) { | |
1223 | ERR("string overflow allocating socket name, " | |
1224 | "UST thread bailing"); | |
1225 | return NULL; | |
1226 | } | |
1227 | ||
1228 | result = ensure_dir_exists(SOCK_DIR); | |
1229 | if (result == -1) { | |
1230 | ERR("Unable to create socket directory %s, UST thread bailing", | |
1231 | SOCK_DIR); | |
1232 | goto free_name; | |
1233 | } | |
1234 | ||
1235 | sock = ustcomm_init_named_socket(name, epoll_fd); | |
1236 | if (!sock) { | |
1237 | ERR("Error initializing named socket (%s). Check that directory" | |
1238 | "exists and that it is writable. UST thread bailing", name); | |
1239 | goto free_name; | |
1240 | } | |
1241 | ||
1242 | free(name); | |
1243 | return sock; | |
1244 | ||
1245 | free_name: | |
1246 | free(name); | |
1247 | return NULL; | |
1248 | } | |
1249 | ||
c1083aa8 | 1250 | static void __attribute__((constructor)) init() |
20b37a31 | 1251 | { |
49d70d5a | 1252 | struct timespec ts; |
20b37a31 | 1253 | int result; |
5de74e51 | 1254 | char* autoprobe_val = NULL; |
223f2e7c AH |
1255 | char* subbuffer_size_val = NULL; |
1256 | char* subbuffer_count_val = NULL; | |
1257 | unsigned int subbuffer_size; | |
1258 | unsigned int subbuffer_count; | |
1259 | unsigned int power; | |
20b37a31 | 1260 | |
ed1317e7 PMF |
1261 | /* Assign the pidunique, to be able to differentiate the processes with same |
1262 | * pid, (before and after an exec). | |
1263 | */ | |
1264 | pidunique = make_pidunique(); | |
bc237fab | 1265 | processpid = getpid(); |
ed1317e7 | 1266 | |
5de74e51 | 1267 | DBG("Tracectl constructor"); |
20b37a31 | 1268 | |
4723ca09 NC |
1269 | /* Set up epoll */ |
1270 | epoll_fd = epoll_create(MAX_EVENTS); | |
1271 | if (epoll_fd == -1) { | |
1272 | ERR("epoll_create failed, tracing shutting down"); | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | /* Create the socket */ | |
1277 | listen_sock = init_app_socket(epoll_fd); | |
1278 | if (!listen_sock) { | |
1279 | ERR("failed to create application socket," | |
1280 | " tracing shutting down"); | |
3847c3ba PMF |
1281 | return; |
1282 | } | |
2944a629 PMF |
1283 | |
1284 | create_listener(); | |
68c1021b | 1285 | |
9c6bb081 | 1286 | /* Get clock the clock source type */ |
49d70d5a | 1287 | |
9c6bb081 JD |
1288 | /* Default clock source */ |
1289 | ust_clock_source = CLOCK_TRACE; | |
1290 | if (clock_gettime(ust_clock_source, &ts) != 0) { | |
1291 | ust_clock_source = CLOCK_MONOTONIC; | |
1292 | DBG("UST traces will not be synchronized with LTTng traces"); | |
1293 | } | |
1294 | ||
5de74e51 | 1295 | autoprobe_val = getenv("UST_AUTOPROBE"); |
e9b58dc0 | 1296 | if (autoprobe_val) { |
4440ebcb PMF |
1297 | struct marker_iter iter; |
1298 | ||
08230db7 | 1299 | DBG("Autoprobe enabled."); |
4440ebcb PMF |
1300 | |
1301 | /* Ensure markers are initialized */ | |
1302 | //init_markers(); | |
1303 | ||
1304 | /* Ensure marker control is initialized, for the probe */ | |
1305 | init_marker_control(); | |
1306 | ||
1307 | /* first, set the callback that will connect the | |
1308 | * probe on new markers | |
1309 | */ | |
e9b58dc0 | 1310 | if (autoprobe_val[0] == '/') { |
5de74e51 PMF |
1311 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); |
1312 | if (result) { | |
1313 | char regexerr[150]; | |
1314 | ||
1315 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
1316 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
1317 | /* don't crash the application just for this */ | |
e9b58dc0 | 1318 | } else { |
5de74e51 PMF |
1319 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; |
1320 | } | |
e9b58dc0 | 1321 | } else { |
5de74e51 PMF |
1322 | /* just enable all instrumentation */ |
1323 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
1324 | } | |
1325 | ||
1326 | marker_set_new_marker_cb(auto_probe_connect); | |
1327 | ||
4440ebcb PMF |
1328 | /* Now, connect the probes that were already registered. */ |
1329 | marker_iter_reset(&iter); | |
1330 | marker_iter_start(&iter); | |
1331 | ||
08230db7 | 1332 | DBG("now iterating on markers already registered"); |
e9b58dc0 | 1333 | while (iter.marker) { |
eb5d20c6 MD |
1334 | DBG("now iterating on marker %s", (*iter.marker)->name); |
1335 | auto_probe_connect(*iter.marker); | |
4440ebcb PMF |
1336 | marker_iter_next(&iter); |
1337 | } | |
1338 | } | |
1339 | ||
e9b58dc0 | 1340 | if (getenv("UST_OVERWRITE")) { |
8649cd59 | 1341 | int val = atoi(getenv("UST_OVERWRITE")); |
e9b58dc0 | 1342 | if (val == 0 || val == 1) { |
0222e121 | 1343 | CMM_STORE_SHARED(ust_channels_overwrite_by_default, val); |
e9b58dc0 | 1344 | } else { |
8649cd59 PMF |
1345 | WARN("invalid value for UST_OVERWRITE"); |
1346 | } | |
1347 | } | |
1348 | ||
e9b58dc0 | 1349 | if (getenv("UST_AUTOCOLLECT")) { |
8649cd59 | 1350 | int val = atoi(getenv("UST_AUTOCOLLECT")); |
e9b58dc0 | 1351 | if (val == 0 || val == 1) { |
0222e121 | 1352 | CMM_STORE_SHARED(ust_channels_request_collection_by_default, val); |
e9b58dc0 | 1353 | } else { |
8649cd59 PMF |
1354 | WARN("invalid value for UST_AUTOCOLLECT"); |
1355 | } | |
1356 | } | |
1357 | ||
223f2e7c | 1358 | subbuffer_size_val = getenv("UST_SUBBUF_SIZE"); |
e9b58dc0 | 1359 | if (subbuffer_size_val) { |
223f2e7c AH |
1360 | sscanf(subbuffer_size_val, "%u", &subbuffer_size); |
1361 | power = pow2_higher_or_eq(subbuffer_size); | |
e9b58dc0 | 1362 | if (power != subbuffer_size) |
223f2e7c AH |
1363 | WARN("using the next power of two for buffer size = %u\n", power); |
1364 | chan_infos[LTT_CHANNEL_UST].def_subbufsize = power; | |
1365 | } | |
1366 | ||
1367 | subbuffer_count_val = getenv("UST_SUBBUF_NUM"); | |
e9b58dc0 | 1368 | if (subbuffer_count_val) { |
223f2e7c | 1369 | sscanf(subbuffer_count_val, "%u", &subbuffer_count); |
e9b58dc0 | 1370 | if (subbuffer_count < 2) |
223f2e7c AH |
1371 | subbuffer_count = 2; |
1372 | chan_infos[LTT_CHANNEL_UST].def_subbufcount = subbuffer_count; | |
1373 | } | |
1374 | ||
e9b58dc0 | 1375 | if (getenv("UST_TRACE")) { |
4db647c5 PMF |
1376 | char trace_name[] = "auto"; |
1377 | char trace_type[] = "ustrelay"; | |
1378 | ||
1379 | DBG("starting early tracing"); | |
1380 | ||
1381 | /* Ensure marker control is initialized */ | |
1382 | init_marker_control(); | |
1383 | ||
4db647c5 PMF |
1384 | /* Ensure markers are initialized */ |
1385 | init_markers(); | |
1386 | ||
e17571a5 PMF |
1387 | /* Ensure buffers are initialized, for the transport to be available. |
1388 | * We are about to set a trace type and it will fail without this. | |
1389 | */ | |
1390 | init_ustrelay_transport(); | |
1391 | ||
027ffc9d PMF |
1392 | /* FIXME: When starting early tracing (here), depending on the |
1393 | * order of constructors, it is very well possible some marker | |
1394 | * sections are not yet registered. Because of this, some | |
1395 | * channels may not be registered. Yet, we are about to ask the | |
1396 | * daemon to collect the channels. Channels which are not yet | |
1397 | * registered will not be collected. | |
1398 | * | |
1399 | * Currently, in LTTng, there is no way to add a channel after | |
1400 | * trace start. The reason for this is that it induces complex | |
1401 | * concurrency issues on the trace structures, which can only | |
1402 | * be resolved using RCU. This has not been done yet. As a | |
1403 | * workaround, we are forcing the registration of the "ust" | |
1404 | * channel here. This is the only channel (apart from metadata) | |
1405 | * that can be reliably used in early tracing. | |
1406 | * | |
1407 | * Non-early tracing does not have this problem and can use | |
1408 | * arbitrary channel names. | |
1409 | */ | |
20b37a31 | 1410 | ltt_channels_register("ust"); |
4db647c5 PMF |
1411 | |
1412 | result = ltt_trace_setup(trace_name); | |
e9b58dc0 | 1413 | if (result < 0) { |
4db647c5 PMF |
1414 | ERR("ltt_trace_setup failed"); |
1415 | return; | |
1416 | } | |
1417 | ||
1418 | result = ltt_trace_set_type(trace_name, trace_type); | |
e9b58dc0 | 1419 | if (result < 0) { |
4db647c5 PMF |
1420 | ERR("ltt_trace_set_type failed"); |
1421 | return; | |
1422 | } | |
1423 | ||
1424 | result = ltt_trace_alloc(trace_name); | |
e9b58dc0 | 1425 | if (result < 0) { |
4db647c5 PMF |
1426 | ERR("ltt_trace_alloc failed"); |
1427 | return; | |
1428 | } | |
1429 | ||
1430 | result = ltt_trace_start(trace_name); | |
e9b58dc0 | 1431 | if (result < 0) { |
4db647c5 PMF |
1432 | ERR("ltt_trace_start failed"); |
1433 | return; | |
1434 | } | |
60e57148 PMF |
1435 | |
1436 | /* Do this after the trace is started in order to avoid creating confusion | |
1437 | * if the trace fails to start. */ | |
1438 | inform_consumer_daemon(trace_name); | |
4db647c5 PMF |
1439 | } |
1440 | ||
68c1021b PMF |
1441 | return; |
1442 | ||
1443 | /* should decrementally destroy stuff if error */ | |
1444 | ||
1445 | } | |
1446 | ||
1447 | /* This is only called if we terminate normally, not with an unhandled signal, | |
6d45c11a PMF |
1448 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
1449 | * the last sub-buffer contain a valid end time for the trace. This is done | |
1450 | * automatically only when the trace is properly stopped. | |
1451 | * | |
1452 | * If the traced program crashed, it is always possible to manually add the | |
1453 | * right value in the header, or to open the trace in text mode. | |
1454 | * | |
1455 | * FIXME: Fix LTTV so it doesn't need this. | |
1456 | */ | |
68c1021b | 1457 | |
6d45c11a | 1458 | static void destroy_traces(void) |
68c1021b | 1459 | { |
6d45c11a | 1460 | int result; |
a584bc4e PMF |
1461 | |
1462 | /* if trace running, finish it */ | |
1463 | ||
6d45c11a | 1464 | DBG("destructor stopping traces"); |
a584bc4e | 1465 | |
6d45c11a | 1466 | result = ltt_trace_stop("auto"); |
e9b58dc0 | 1467 | if (result == -1) { |
6d45c11a PMF |
1468 | ERR("ltt_trace_stop error"); |
1469 | } | |
1470 | ||
31d392f1 | 1471 | result = ltt_trace_destroy("auto", 0); |
e9b58dc0 | 1472 | if (result == -1) { |
6d45c11a PMF |
1473 | ERR("ltt_trace_destroy error"); |
1474 | } | |
68c1021b | 1475 | } |
1e2944cb | 1476 | |
97d9b88b PMF |
1477 | static int trace_recording(void) |
1478 | { | |
1479 | int retval = 0; | |
b73a4c47 | 1480 | struct ust_trace *trace; |
97d9b88b PMF |
1481 | |
1482 | ltt_lock_traces(); | |
1483 | ||
0222e121 | 1484 | cds_list_for_each_entry(trace, <t_traces.head, list) { |
e9b58dc0 | 1485 | if (trace->active) { |
97d9b88b PMF |
1486 | retval = 1; |
1487 | break; | |
1488 | } | |
1489 | } | |
1490 | ||
1491 | ltt_unlock_traces(); | |
1492 | ||
1493 | return retval; | |
1494 | } | |
1495 | ||
f293009f | 1496 | int restarting_usleep(useconds_t usecs) |
97d9b88b | 1497 | { |
72098143 NC |
1498 | struct timespec tv; |
1499 | int result; | |
1500 | ||
1501 | tv.tv_sec = 0; | |
1502 | tv.tv_nsec = usecs * 1000; | |
1503 | ||
1504 | do { | |
e9b58dc0 DS |
1505 | result = nanosleep(&tv, &tv); |
1506 | } while (result == -1 && errno == EINTR); | |
97d9b88b PMF |
1507 | |
1508 | return result; | |
1509 | } | |
1510 | ||
4267e589 | 1511 | static void stop_listener(void) |
fc253ce0 PMF |
1512 | { |
1513 | int result; | |
1514 | ||
e9b58dc0 | 1515 | if (!have_listener) |
4267e589 PMF |
1516 | return; |
1517 | ||
fc253ce0 | 1518 | result = pthread_cancel(listener_thread); |
e9b58dc0 | 1519 | if (result != 0) { |
18cbdbac | 1520 | ERR("pthread_cancel: %s", strerror(result)); |
fc253ce0 PMF |
1521 | } |
1522 | result = pthread_join(listener_thread, NULL); | |
e9b58dc0 | 1523 | if (result != 0) { |
18cbdbac | 1524 | ERR("pthread_join: %s", strerror(result)); |
fc253ce0 PMF |
1525 | } |
1526 | } | |
1527 | ||
f293009f | 1528 | /* This destructor keeps the process alive for a few seconds in order |
9dc7b7ff | 1529 | * to leave time for ustconsumer to connect to its buffers. This is necessary |
f293009f PMF |
1530 | * for programs whose execution is very short. It is also useful in all |
1531 | * programs when tracing is started close to the end of the program | |
1532 | * execution. | |
1533 | * | |
1534 | * FIXME: For now, this only works for the first trace created in a | |
1535 | * process. | |
1536 | */ | |
1537 | ||
97d9b88b PMF |
1538 | static void __attribute__((destructor)) keepalive() |
1539 | { | |
bc237fab NC |
1540 | if (processpid != getpid()) { |
1541 | return; | |
1542 | } | |
1543 | ||
0222e121 | 1544 | if (trace_recording() && CMM_LOAD_SHARED(buffers_to_export)) { |
c472cce0 | 1545 | int total = 0; |
f293009f | 1546 | DBG("Keeping process alive for consumer daemon..."); |
0222e121 | 1547 | while (CMM_LOAD_SHARED(buffers_to_export)) { |
f293009f | 1548 | const int interv = 200000; |
c472cce0 | 1549 | restarting_usleep(interv); |
f293009f PMF |
1550 | total += interv; |
1551 | ||
e9b58dc0 | 1552 | if (total >= 3000000) { |
c472cce0 | 1553 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
f293009f PMF |
1554 | break; |
1555 | } | |
1556 | } | |
1557 | DBG("Finally dying..."); | |
1558 | } | |
6d45c11a PMF |
1559 | |
1560 | destroy_traces(); | |
1561 | ||
fc253ce0 PMF |
1562 | /* Ask the listener to stop and clean up. */ |
1563 | stop_listener(); | |
97d9b88b | 1564 | } |
97d9b88b | 1565 | |
775c8a3f | 1566 | void ust_potential_exec(void) |
c396a841 PMF |
1567 | { |
1568 | trace_mark(ust, potential_exec, MARK_NOARGS); | |
1569 | ||
775c8a3f PMF |
1570 | DBG("test"); |
1571 | ||
c396a841 PMF |
1572 | keepalive(); |
1573 | } | |
1574 | ||
1e2944cb PMF |
1575 | /* Notify ust that there was a fork. This needs to be called inside |
1576 | * the new process, anytime a process whose memory is not shared with | |
1577 | * the parent is created. If this function is not called, the events | |
1578 | * of the new process will not be collected. | |
616ed36a PMF |
1579 | * |
1580 | * Signals should be disabled before the fork and reenabled only after | |
1581 | * this call in order to guarantee tracing is not started before ust_fork() | |
1582 | * sanitizes the new process. | |
1e2944cb PMF |
1583 | */ |
1584 | ||
616ed36a | 1585 | static void ust_fork(void) |
1e2944cb | 1586 | { |
4723ca09 NC |
1587 | struct ust_buffer *buf, *buf_tmp; |
1588 | struct ustcomm_sock *sock, *sock_tmp; | |
1d471d9f | 1589 | struct ust_trace *trace, *trace_tmp; |
99b72dc0 PMF |
1590 | int result; |
1591 | ||
31d392f1 | 1592 | /* FIXME: technically, the locks could have been taken before the fork */ |
1e2944cb | 1593 | DBG("ust: forking"); |
73850001 | 1594 | |
bc237fab NC |
1595 | /* Get the pid of the new process */ |
1596 | processpid = getpid(); | |
1597 | ||
1d471d9f NC |
1598 | /* |
1599 | * FIXME: This could be prettier, we loop over the list twice and | |
1600 | * following good locking practice should lock around the loop | |
1601 | */ | |
1602 | cds_list_for_each_entry_safe(trace, trace_tmp, <t_traces.head, list) { | |
1603 | ltt_trace_stop(trace->trace_name); | |
1604 | } | |
1605 | ||
4723ca09 | 1606 | /* Delete all active connections, but leave them in the epoll set */ |
0222e121 | 1607 | cds_list_for_each_entry_safe(sock, sock_tmp, &ust_socks, list) { |
4723ca09 NC |
1608 | ustcomm_del_sock(sock, 1); |
1609 | } | |
99b72dc0 PMF |
1610 | |
1611 | /* Delete all blocked consumers */ | |
0222e121 | 1612 | cds_list_for_each_entry_safe(buf, buf_tmp, &open_buffers_list, |
4723ca09 | 1613 | open_buffers_list) { |
0222e121 | 1614 | cds_list_del(&buf->open_buffers_list); |
99b72dc0 PMF |
1615 | } |
1616 | ||
1d471d9f NC |
1617 | /* |
1618 | * FIXME: This could be prettier, we loop over the list twice and | |
1619 | * following good locking practice should lock around the loop | |
1620 | */ | |
1621 | cds_list_for_each_entry_safe(trace, trace_tmp, <t_traces.head, list) { | |
1622 | ltt_trace_destroy(trace->trace_name, 1); | |
1623 | } | |
3659d94c | 1624 | |
fd9c2963 MD |
1625 | /* Clean up the listener socket and epoll, keeping the socket file */ |
1626 | if (listen_sock) { | |
1627 | ustcomm_del_named_sock(listen_sock, 1); | |
1628 | listen_sock = NULL; | |
1629 | } | |
4723ca09 | 1630 | close(epoll_fd); |
393bc391 | 1631 | |
4723ca09 | 1632 | /* Re-start the launch sequence */ |
0222e121 | 1633 | CMM_STORE_SHARED(buffers_to_export, 0); |
1e2944cb | 1634 | have_listener = 0; |
4723ca09 NC |
1635 | |
1636 | /* Set up epoll */ | |
1637 | epoll_fd = epoll_create(MAX_EVENTS); | |
1638 | if (epoll_fd == -1) { | |
1639 | ERR("epoll_create failed, tracing shutting down"); | |
1640 | return; | |
1641 | } | |
1642 | ||
1643 | /* Create the socket */ | |
1644 | listen_sock = init_app_socket(epoll_fd); | |
1645 | if (!listen_sock) { | |
1646 | ERR("failed to create application socket," | |
1647 | " tracing shutting down"); | |
1648 | return; | |
1649 | } | |
9fb49d0e | 1650 | create_listener(); |
99b72dc0 PMF |
1651 | ltt_trace_setup("auto"); |
1652 | result = ltt_trace_set_type("auto", "ustrelay"); | |
e9b58dc0 | 1653 | if (result < 0) { |
99b72dc0 | 1654 | ERR("ltt_trace_set_type failed"); |
036db133 | 1655 | return; |
99b72dc0 PMF |
1656 | } |
1657 | ||
1658 | ltt_trace_alloc("auto"); | |
1659 | ltt_trace_start("auto"); | |
ad45e833 | 1660 | inform_consumer_daemon("auto"); |
1e2944cb PMF |
1661 | } |
1662 | ||
616ed36a PMF |
1663 | void ust_before_fork(ust_fork_info_t *fork_info) |
1664 | { | |
1665 | /* Disable signals. This is to avoid that the child | |
1666 | * intervenes before it is properly setup for tracing. It is | |
1667 | * safer to disable all signals, because then we know we are not | |
1668 | * breaking anything by restoring the original mask. | |
1669 | */ | |
1670 | sigset_t all_sigs; | |
1671 | int result; | |
1672 | ||
1673 | /* FIXME: | |
1674 | - only do this if tracing is active | |
1675 | */ | |
1676 | ||
1677 | /* Disable signals */ | |
1678 | sigfillset(&all_sigs); | |
1679 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); | |
e9b58dc0 | 1680 | if (result == -1) { |
616ed36a PMF |
1681 | PERROR("sigprocmask"); |
1682 | return; | |
1683 | } | |
fd9c2963 MD |
1684 | |
1685 | /* | |
1686 | * Take the fork lock to make sure we are not in the middle of | |
1687 | * something in the listener thread. | |
1688 | */ | |
1689 | pthread_mutex_lock(&listener_thread_data_mutex); | |
1690 | /* | |
1691 | * Hold listen_sock_mutex to protect from listen_sock teardown. | |
1692 | */ | |
1693 | pthread_mutex_lock(&listen_sock_mutex); | |
616ed36a PMF |
1694 | } |
1695 | ||
1696 | /* Don't call this function directly in a traced program */ | |
1697 | static void ust_after_fork_common(ust_fork_info_t *fork_info) | |
1698 | { | |
1699 | int result; | |
616ed36a | 1700 | |
fd9c2963 MD |
1701 | pthread_mutex_unlock(&listen_sock_mutex); |
1702 | pthread_mutex_unlock(&listener_thread_data_mutex); | |
1703 | ||
616ed36a PMF |
1704 | /* Restore signals */ |
1705 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); | |
e9b58dc0 | 1706 | if (result == -1) { |
616ed36a PMF |
1707 | PERROR("sigprocmask"); |
1708 | return; | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | void ust_after_fork_parent(ust_fork_info_t *fork_info) | |
1713 | { | |
0b362d6f | 1714 | /* Release mutexes and reenable signals */ |
616ed36a PMF |
1715 | ust_after_fork_common(fork_info); |
1716 | } | |
1717 | ||
1718 | void ust_after_fork_child(ust_fork_info_t *fork_info) | |
1719 | { | |
1720 | /* First sanitize the child */ | |
1721 | ust_fork(); | |
1722 | ||
0b362d6f | 1723 | /* Then release mutexes and reenable signals */ |
616ed36a | 1724 | ust_after_fork_common(fork_info); |
0b362d6f MD |
1725 | |
1726 | /* | |
1727 | * Make sure we clean up the urcu-bp thread list in the child by running | |
1728 | * the garbage collection before any pthread_create can be called. | |
1729 | * Failure to do so could lead to a deadlock caused by reuse of a thread | |
1730 | * ID before urcu-bp garbage collection is performed. | |
1731 | */ | |
1732 | synchronize_rcu(); | |
616ed36a PMF |
1733 | } |
1734 |