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 | ||
e625e919 MD |
546 | static void release_listener_mutex(void *ptr) |
547 | { | |
548 | pthread_mutex_unlock(&listener_thread_data_mutex); | |
549 | } | |
550 | ||
fc253ce0 PMF |
551 | static void listener_cleanup(void *ptr) |
552 | { | |
fd9c2963 MD |
553 | pthread_mutex_lock(&listen_sock_mutex); |
554 | if (listen_sock) { | |
555 | ustcomm_del_named_sock(listen_sock, 0); | |
556 | listen_sock = NULL; | |
557 | } | |
558 | pthread_mutex_unlock(&listen_sock_mutex); | |
fc253ce0 PMF |
559 | } |
560 | ||
e005efaa | 561 | static int force_subbuf_switch(const char *trace_name) |
b9318b35 | 562 | { |
e005efaa NC |
563 | struct ust_trace *trace; |
564 | int i, j, retval = 0; | |
b9318b35 | 565 | |
e005efaa NC |
566 | ltt_lock_traces(); |
567 | trace = _ltt_trace_find(trace_name); | |
568 | if (!trace) { | |
569 | retval = -ENODATA; | |
570 | DBG("Cannot find trace. It was likely destroyed by the user."); | |
571 | goto unlock_traces; | |
572 | } | |
573 | ||
574 | for (i = 0; i < trace->nr_channels; i++) { | |
575 | for (j = 0; j < trace->channels[i].n_cpus; j++) { | |
576 | ltt_force_switch(trace->channels[i].buf[j], | |
577 | FORCE_FLUSH); | |
578 | } | |
b9318b35 | 579 | } |
e005efaa NC |
580 | |
581 | unlock_traces: | |
582 | ltt_unlock_traces(); | |
583 | ||
584 | return retval; | |
b9318b35 AH |
585 | } |
586 | ||
72098143 NC |
587 | /* Simple commands are those which need only respond with a return value. */ |
588 | static int process_simple_client_cmd(int command, char *recv_buf) | |
98963de4 | 589 | { |
28c1bb40 NC |
590 | int result; |
591 | ||
72098143 NC |
592 | switch(command) { |
593 | case SET_SOCK_PATH: | |
594 | { | |
28c1bb40 NC |
595 | struct ustcomm_single_field *sock_msg; |
596 | sock_msg = (struct ustcomm_single_field *)recv_buf; | |
597 | result = ustcomm_unpack_single_field(sock_msg); | |
598 | if (result < 0) { | |
599 | return result; | |
a3adfb05 | 600 | } |
28c1bb40 | 601 | return setenv("UST_DAEMON_SOCKET", sock_msg->field, 1); |
72098143 | 602 | } |
d89b8191 | 603 | |
d89b8191 NC |
604 | default: |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | ||
612 | static int process_trace_cmd(int command, char *trace_name) | |
613 | { | |
614 | int result; | |
615 | char trace_type[] = "ustrelay"; | |
616 | ||
617 | switch(command) { | |
72098143 | 618 | case START: |
0e4b45ac PMF |
619 | /* start is an operation that setups the trace, allocates it and starts it */ |
620 | result = ltt_trace_setup(trace_name); | |
e9b58dc0 | 621 | if (result < 0) { |
0e4b45ac | 622 | ERR("ltt_trace_setup failed"); |
72098143 | 623 | return result; |
3a7b90de | 624 | } |
98963de4 | 625 | |
0e4b45ac | 626 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 627 | if (result < 0) { |
0e4b45ac | 628 | ERR("ltt_trace_set_type failed"); |
72098143 | 629 | return result; |
52c51a47 | 630 | } |
52c51a47 | 631 | |
0e4b45ac | 632 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 633 | if (result < 0) { |
0e4b45ac | 634 | ERR("ltt_trace_alloc failed"); |
72098143 | 635 | return result; |
52c51a47 | 636 | } |
52c51a47 | 637 | |
0e4b45ac | 638 | inform_consumer_daemon(trace_name); |
52c51a47 | 639 | |
0e4b45ac | 640 | result = ltt_trace_start(trace_name); |
e9b58dc0 | 641 | if (result < 0) { |
0e4b45ac | 642 | ERR("ltt_trace_start failed"); |
72098143 | 643 | return result; |
d0b5f2b9 | 644 | } |
72098143 NC |
645 | |
646 | return 0; | |
647 | case SETUP_TRACE: | |
0e4b45ac | 648 | DBG("trace setup"); |
d0b5f2b9 | 649 | |
0e4b45ac | 650 | result = ltt_trace_setup(trace_name); |
e9b58dc0 | 651 | if (result < 0) { |
0e4b45ac | 652 | ERR("ltt_trace_setup failed"); |
72098143 | 653 | return result; |
d0b5f2b9 | 654 | } |
d0b5f2b9 | 655 | |
0e4b45ac | 656 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 657 | if (result < 0) { |
0e4b45ac | 658 | ERR("ltt_trace_set_type failed"); |
72098143 | 659 | return result; |
d0b5f2b9 | 660 | } |
72098143 NC |
661 | |
662 | return 0; | |
663 | case ALLOC_TRACE: | |
0e4b45ac | 664 | DBG("trace alloc"); |
62ec620f | 665 | |
0e4b45ac | 666 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 667 | if (result < 0) { |
0e4b45ac | 668 | ERR("ltt_trace_alloc failed"); |
72098143 | 669 | return result; |
763f41e5 | 670 | } |
0e4b45ac | 671 | inform_consumer_daemon(trace_name); |
72098143 NC |
672 | |
673 | return 0; | |
674 | ||
675 | case CREATE_TRACE: | |
0e4b45ac | 676 | DBG("trace create"); |
d0b5f2b9 | 677 | |
0e4b45ac | 678 | result = ltt_trace_setup(trace_name); |
e9b58dc0 | 679 | if (result < 0) { |
0e4b45ac | 680 | ERR("ltt_trace_setup failed"); |
72098143 | 681 | return result; |
d0b5f2b9 | 682 | } |
d0b5f2b9 | 683 | |
0e4b45ac | 684 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 685 | if (result < 0) { |
0e4b45ac | 686 | ERR("ltt_trace_set_type failed"); |
72098143 | 687 | return result; |
d0b5f2b9 | 688 | } |
72098143 NC |
689 | |
690 | return 0; | |
691 | case START_TRACE: | |
0e4b45ac | 692 | DBG("trace start"); |
aafb1650 | 693 | |
0e4b45ac | 694 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 695 | if (result < 0) { |
0e4b45ac | 696 | ERR("ltt_trace_alloc failed"); |
72098143 | 697 | return result; |
811e4b93 | 698 | } |
e9b58dc0 | 699 | if (!result) { |
0e4b45ac | 700 | inform_consumer_daemon(trace_name); |
811e4b93 | 701 | } |
0e4b45ac PMF |
702 | |
703 | result = ltt_trace_start(trace_name); | |
e9b58dc0 | 704 | if (result < 0) { |
0e4b45ac | 705 | ERR("ltt_trace_start failed"); |
72098143 | 706 | return result; |
3847c3ba | 707 | } |
72098143 NC |
708 | |
709 | return 0; | |
710 | case STOP_TRACE: | |
0e4b45ac | 711 | DBG("trace stop"); |
b02e31e5 | 712 | |
0e4b45ac | 713 | result = ltt_trace_stop(trace_name); |
e9b58dc0 | 714 | if (result < 0) { |
0e4b45ac | 715 | ERR("ltt_trace_stop failed"); |
72098143 | 716 | return result; |
0e4b45ac | 717 | } |
b02e31e5 | 718 | |
72098143 NC |
719 | return 0; |
720 | case DESTROY_TRACE: | |
0e4b45ac | 721 | DBG("trace destroy"); |
204141ee | 722 | |
0e4b45ac | 723 | result = ltt_trace_destroy(trace_name, 0); |
e9b58dc0 | 724 | if (result < 0) { |
0e4b45ac | 725 | ERR("ltt_trace_destroy failed"); |
72098143 | 726 | return result; |
763f41e5 | 727 | } |
72098143 | 728 | return 0; |
e005efaa NC |
729 | case FORCE_SUBBUF_SWITCH: |
730 | DBG("force switch"); | |
731 | ||
732 | result = force_subbuf_switch(trace_name); | |
733 | if (result < 0) { | |
734 | ERR("force_subbuf_switch failed"); | |
735 | return result; | |
736 | } | |
737 | return 0; | |
72098143 NC |
738 | } |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
d89b8191 | 743 | |
72098143 NC |
744 | static void process_channel_cmd(int sock, int command, |
745 | struct ustcomm_channel_info *ch_inf) | |
746 | { | |
747 | struct ustcomm_header _reply_header; | |
748 | struct ustcomm_header *reply_header = &_reply_header; | |
749 | struct ustcomm_channel_info *reply_msg = | |
750 | (struct ustcomm_channel_info *)send_buffer; | |
72098143 NC |
751 | int result, offset = 0, num, size; |
752 | ||
753 | memset(reply_header, 0, sizeof(*reply_header)); | |
754 | ||
755 | switch (command) { | |
756 | case GET_SUBBUF_NUM_SIZE: | |
d89b8191 | 757 | result = get_subbuf_num_size(ch_inf->trace, |
72098143 NC |
758 | ch_inf->channel, |
759 | &num, &size); | |
760 | if (result < 0) { | |
761 | reply_header->result = result; | |
762 | break; | |
763 | } | |
764 | ||
765 | reply_msg->channel = USTCOMM_POISON_PTR; | |
766 | reply_msg->subbuf_num = num; | |
767 | reply_msg->subbuf_size = size; | |
768 | ||
769 | ||
770 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
771 | ||
772 | break; | |
773 | case SET_SUBBUF_NUM: | |
d89b8191 | 774 | reply_header->result = set_subbuf_num(ch_inf->trace, |
72098143 NC |
775 | ch_inf->channel, |
776 | ch_inf->subbuf_num); | |
777 | ||
778 | break; | |
779 | case SET_SUBBUF_SIZE: | |
d89b8191 | 780 | reply_header->result = set_subbuf_size(ch_inf->trace, |
72098143 NC |
781 | ch_inf->channel, |
782 | ch_inf->subbuf_size); | |
783 | ||
784 | ||
785 | break; | |
786 | } | |
787 | if (ustcomm_send(sock, reply_header, (char *)reply_msg) < 0) { | |
788 | ERR("ustcomm_send failed"); | |
789 | } | |
790 | } | |
791 | ||
792 | static void process_buffer_cmd(int sock, int command, | |
793 | struct ustcomm_buffer_info *buf_inf) | |
794 | { | |
795 | struct ustcomm_header _reply_header; | |
796 | struct ustcomm_header *reply_header = &_reply_header; | |
797 | struct ustcomm_buffer_info *reply_msg = | |
798 | (struct ustcomm_buffer_info *)send_buffer; | |
72098143 NC |
799 | int result, offset = 0, buf_shmid, buf_struct_shmid, buf_pipe_fd; |
800 | long consumed_old; | |
52c51a47 | 801 | |
72098143 NC |
802 | memset(reply_header, 0, sizeof(*reply_header)); |
803 | ||
804 | switch (command) { | |
805 | case GET_BUF_SHMID_PIPE_FD: | |
d89b8191 NC |
806 | result = get_buffer_shmid_pipe_fd(buf_inf->trace, |
807 | buf_inf->channel, | |
72098143 NC |
808 | buf_inf->ch_cpu, |
809 | &buf_shmid, | |
810 | &buf_struct_shmid, | |
811 | &buf_pipe_fd); | |
812 | if (result < 0) { | |
813 | reply_header->result = result; | |
814 | break; | |
52c51a47 | 815 | } |
52c51a47 | 816 | |
72098143 NC |
817 | reply_msg->channel = USTCOMM_POISON_PTR; |
818 | reply_msg->buf_shmid = buf_shmid; | |
819 | reply_msg->buf_struct_shmid = buf_struct_shmid; | |
820 | ||
821 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
822 | reply_header->fd_included = 1; | |
823 | ||
824 | if (ustcomm_send_fd(sock, reply_header, (char *)reply_msg, | |
825 | &buf_pipe_fd) < 0) { | |
826 | ERR("ustcomm_send failed"); | |
827 | } | |
828 | return; | |
829 | ||
830 | case NOTIFY_BUF_MAPPED: | |
831 | reply_header->result = | |
d89b8191 | 832 | notify_buffer_mapped(buf_inf->trace, |
72098143 NC |
833 | buf_inf->channel, |
834 | buf_inf->ch_cpu); | |
835 | break; | |
836 | case GET_SUBBUFFER: | |
d89b8191 | 837 | result = get_subbuffer(buf_inf->trace, buf_inf->channel, |
72098143 | 838 | buf_inf->ch_cpu, &consumed_old); |
e9b58dc0 | 839 | if (result < 0) { |
72098143 NC |
840 | reply_header->result = result; |
841 | break; | |
0e4b45ac | 842 | } |
c5ff938a | 843 | |
72098143 NC |
844 | reply_msg->channel = USTCOMM_POISON_PTR; |
845 | reply_msg->consumed_old = consumed_old; | |
846 | ||
847 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
848 | ||
849 | break; | |
850 | case PUT_SUBBUFFER: | |
d89b8191 | 851 | result = put_subbuffer(buf_inf->trace, buf_inf->channel, |
72098143 NC |
852 | buf_inf->ch_cpu, |
853 | buf_inf->consumed_old); | |
854 | reply_header->result = result; | |
855 | ||
856 | break; | |
857 | } | |
858 | ||
859 | if (ustcomm_send(sock, reply_header, (char *)reply_msg) < 0) { | |
860 | ERR("ustcomm_send failed"); | |
861 | } | |
862 | ||
863 | } | |
864 | ||
865 | static void process_marker_cmd(int sock, int command, | |
866 | struct ustcomm_marker_info *marker_inf) | |
867 | { | |
868 | struct ustcomm_header _reply_header; | |
869 | struct ustcomm_header *reply_header = &_reply_header; | |
e2b46575 | 870 | int result = 0; |
52c51a47 | 871 | |
72098143 NC |
872 | memset(reply_header, 0, sizeof(*reply_header)); |
873 | ||
874 | switch(command) { | |
875 | case ENABLE_MARKER: | |
876 | ||
877 | result = ltt_marker_connect(marker_inf->channel, | |
878 | marker_inf->marker, | |
879 | "default"); | |
880 | if (result < 0) { | |
881 | WARN("could not enable marker; channel=%s," | |
882 | " name=%s", | |
883 | marker_inf->channel, | |
884 | marker_inf->marker); | |
52c51a47 | 885 | |
52c51a47 | 886 | } |
72098143 NC |
887 | break; |
888 | case DISABLE_MARKER: | |
889 | result = ltt_marker_disconnect(marker_inf->channel, | |
890 | marker_inf->marker, | |
891 | "default"); | |
892 | if (result < 0) { | |
893 | WARN("could not disable marker; channel=%s," | |
894 | " name=%s", | |
895 | marker_inf->channel, | |
896 | marker_inf->marker); | |
897 | } | |
898 | break; | |
899 | } | |
ed1317e7 | 900 | |
72098143 NC |
901 | reply_header->result = result; |
902 | ||
903 | if (ustcomm_send(sock, reply_header, NULL) < 0) { | |
904 | ERR("ustcomm_send failed"); | |
905 | } | |
906 | ||
907 | } | |
908 | static void process_client_cmd(struct ustcomm_header *recv_header, | |
909 | char *recv_buf, int sock) | |
910 | { | |
911 | int result; | |
912 | struct ustcomm_header _reply_header; | |
913 | struct ustcomm_header *reply_header = &_reply_header; | |
914 | char *send_buf = send_buffer; | |
915 | ||
916 | memset(reply_header, 0, sizeof(*reply_header)); | |
917 | memset(send_buf, 0, sizeof(send_buffer)); | |
918 | ||
919 | switch(recv_header->command) { | |
920 | case GET_SUBBUF_NUM_SIZE: | |
921 | case SET_SUBBUF_NUM: | |
922 | case SET_SUBBUF_SIZE: | |
923 | { | |
924 | struct ustcomm_channel_info *ch_inf; | |
925 | ch_inf = (struct ustcomm_channel_info *)recv_buf; | |
926 | result = ustcomm_unpack_channel_info(ch_inf); | |
927 | if (result < 0) { | |
928 | ERR("couldn't unpack channel info"); | |
929 | reply_header->result = -EINVAL; | |
930 | goto send_response; | |
931 | } | |
932 | process_channel_cmd(sock, recv_header->command, ch_inf); | |
933 | return; | |
934 | } | |
935 | case GET_BUF_SHMID_PIPE_FD: | |
936 | case NOTIFY_BUF_MAPPED: | |
937 | case GET_SUBBUFFER: | |
938 | case PUT_SUBBUFFER: | |
939 | { | |
940 | struct ustcomm_buffer_info *buf_inf; | |
941 | buf_inf = (struct ustcomm_buffer_info *)recv_buf; | |
942 | result = ustcomm_unpack_buffer_info(buf_inf); | |
943 | if (result < 0) { | |
944 | ERR("couldn't unpack buffer info"); | |
945 | reply_header->result = -EINVAL; | |
946 | goto send_response; | |
947 | } | |
948 | process_buffer_cmd(sock, recv_header->command, buf_inf); | |
949 | return; | |
950 | } | |
951 | case ENABLE_MARKER: | |
952 | case DISABLE_MARKER: | |
953 | { | |
954 | struct ustcomm_marker_info *marker_inf; | |
955 | marker_inf = (struct ustcomm_marker_info *)recv_buf; | |
956 | result = ustcomm_unpack_marker_info(marker_inf); | |
e9b58dc0 | 957 | if (result < 0) { |
72098143 NC |
958 | ERR("couldn't unpack marker info"); |
959 | reply_header->result = -EINVAL; | |
960 | goto send_response; | |
0e4b45ac | 961 | } |
72098143 NC |
962 | process_marker_cmd(sock, recv_header->command, marker_inf); |
963 | return; | |
964 | } | |
965 | case LIST_MARKERS: | |
966 | { | |
967 | char *ptr; | |
968 | size_t size; | |
969 | FILE *fp; | |
c5ff938a | 970 | |
72098143 NC |
971 | fp = open_memstream(&ptr, &size); |
972 | if (fp == NULL) { | |
973 | ERR("opening memstream failed"); | |
974 | return; | |
975 | } | |
976 | print_markers(fp); | |
977 | fclose(fp); | |
ed1317e7 | 978 | |
83aa1692 | 979 | reply_header->size = size + 1; /* Include final \0 */ |
72098143 NC |
980 | |
981 | result = ustcomm_send(sock, reply_header, ptr); | |
982 | ||
983 | free(ptr); | |
984 | ||
985 | if (result < 0) { | |
986 | PERROR("failed to send markers list"); | |
987 | } | |
988 | ||
989 | break; | |
990 | } | |
991 | case LIST_TRACE_EVENTS: | |
992 | { | |
993 | char *ptr; | |
994 | size_t size; | |
995 | FILE *fp; | |
996 | ||
997 | fp = open_memstream(&ptr, &size); | |
998 | if (fp == NULL) { | |
999 | ERR("opening memstream failed"); | |
1000 | return; | |
08b8805e | 1001 | } |
72098143 NC |
1002 | print_trace_events(fp); |
1003 | fclose(fp); | |
1004 | ||
83aa1692 | 1005 | reply_header->size = size + 1; /* Include final \0 */ |
72098143 NC |
1006 | |
1007 | result = ustcomm_send(sock, reply_header, ptr); | |
ed1317e7 | 1008 | |
72098143 NC |
1009 | free(ptr); |
1010 | ||
1011 | if (result < 0) { | |
1012 | ERR("list_trace_events failed"); | |
1013 | return; | |
ed1317e7 | 1014 | } |
0e4b45ac | 1015 | |
72098143 NC |
1016 | break; |
1017 | } | |
1018 | case LOAD_PROBE_LIB: | |
1019 | { | |
1020 | char *libfile; | |
1021 | ||
1022 | /* FIXME: No functionality at all... */ | |
1023 | libfile = recv_buf; | |
1024 | ||
1025 | DBG("load_probe_lib loading %s", libfile); | |
1026 | ||
1027 | break; | |
1028 | } | |
1029 | case GET_PIDUNIQUE: | |
1030 | { | |
1031 | struct ustcomm_pidunique *pid_msg; | |
1032 | pid_msg = (struct ustcomm_pidunique *)send_buf; | |
1033 | ||
1034 | pid_msg->pidunique = pidunique; | |
1035 | reply_header->size = sizeof(pid_msg); | |
1036 | ||
1037 | goto send_response; | |
1038 | ||
1039 | } | |
1040 | case GET_SOCK_PATH: | |
1041 | { | |
28c1bb40 | 1042 | struct ustcomm_single_field *sock_msg; |
72098143 NC |
1043 | char *sock_path_env; |
1044 | ||
28c1bb40 | 1045 | sock_msg = (struct ustcomm_single_field *)send_buf; |
72098143 NC |
1046 | |
1047 | sock_path_env = getenv("UST_DAEMON_SOCKET"); | |
1048 | ||
1049 | if (!sock_path_env) { | |
28c1bb40 NC |
1050 | result = ustcomm_pack_single_field(reply_header, |
1051 | sock_msg, | |
9dc7b7ff | 1052 | SOCK_DIR "/ustconsumer"); |
72098143 | 1053 | |
e9b58dc0 | 1054 | } else { |
28c1bb40 NC |
1055 | result = ustcomm_pack_single_field(reply_header, |
1056 | sock_msg, | |
1057 | sock_path_env); | |
b2fb2f91 | 1058 | } |
72098143 NC |
1059 | reply_header->result = result; |
1060 | ||
1061 | goto send_response; | |
0e4b45ac | 1062 | } |
d89b8191 NC |
1063 | case START: |
1064 | case SETUP_TRACE: | |
1065 | case ALLOC_TRACE: | |
1066 | case CREATE_TRACE: | |
1067 | case START_TRACE: | |
1068 | case STOP_TRACE: | |
1069 | case DESTROY_TRACE: | |
e005efaa | 1070 | case FORCE_SUBBUF_SWITCH: |
d89b8191 | 1071 | { |
28c1bb40 NC |
1072 | struct ustcomm_single_field *trace_inf = |
1073 | (struct ustcomm_single_field *)recv_buf; | |
d89b8191 | 1074 | |
28c1bb40 | 1075 | result = ustcomm_unpack_single_field(trace_inf); |
d89b8191 NC |
1076 | if (result < 0) { |
1077 | ERR("couldn't unpack trace info"); | |
1078 | reply_header->result = -EINVAL; | |
1079 | goto send_response; | |
1080 | } | |
1081 | ||
1082 | reply_header->result = | |
1083 | process_trace_cmd(recv_header->command, | |
28c1bb40 | 1084 | trace_inf->field); |
d89b8191 NC |
1085 | goto send_response; |
1086 | ||
1087 | } | |
72098143 NC |
1088 | default: |
1089 | reply_header->result = | |
1090 | process_simple_client_cmd(recv_header->command, | |
1091 | recv_buf); | |
1092 | goto send_response; | |
0e4b45ac | 1093 | |
72098143 | 1094 | } |
0e4b45ac | 1095 | |
72098143 NC |
1096 | return; |
1097 | ||
1098 | send_response: | |
1099 | ustcomm_send(sock, reply_header, send_buf); | |
0e4b45ac PMF |
1100 | } |
1101 | ||
4723ca09 NC |
1102 | #define MAX_EVENTS 10 |
1103 | ||
0e4b45ac PMF |
1104 | void *listener_main(void *p) |
1105 | { | |
4723ca09 NC |
1106 | struct ustcomm_sock *epoll_sock; |
1107 | struct epoll_event events[MAX_EVENTS]; | |
1108 | struct sockaddr addr; | |
1109 | int accept_fd, nfds, result, i, addr_size; | |
0e4b45ac PMF |
1110 | |
1111 | DBG("LISTENER"); | |
1112 | ||
1113 | pthread_cleanup_push(listener_cleanup, NULL); | |
1114 | ||
4723ca09 NC |
1115 | for(;;) { |
1116 | nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1); | |
1117 | if (nfds == -1) { | |
1118 | PERROR("listener_main: epoll_wait failed"); | |
1119 | continue; | |
688760ef | 1120 | } |
d0b5f2b9 | 1121 | |
4723ca09 | 1122 | for (i = 0; i < nfds; i++) { |
fd9c2963 | 1123 | pthread_mutex_lock(&listener_thread_data_mutex); |
e625e919 | 1124 | pthread_cleanup_push(release_listener_mutex, NULL); |
4723ca09 NC |
1125 | epoll_sock = (struct ustcomm_sock *)events[i].data.ptr; |
1126 | if (epoll_sock == listen_sock) { | |
1127 | addr_size = sizeof(struct sockaddr); | |
1128 | accept_fd = accept(epoll_sock->fd, | |
1129 | &addr, | |
1130 | (socklen_t *)&addr_size); | |
1131 | if (accept_fd == -1) { | |
1132 | PERROR("listener_main: accept failed"); | |
1133 | continue; | |
1134 | } | |
1135 | ustcomm_init_sock(accept_fd, epoll_fd, | |
1136 | &ust_socks); | |
1137 | } else { | |
72098143 NC |
1138 | memset(receive_header, 0, |
1139 | sizeof(*receive_header)); | |
1140 | memset(receive_buffer, 0, | |
1141 | sizeof(receive_buffer)); | |
1142 | result = ustcomm_recv(epoll_sock->fd, | |
1143 | receive_header, | |
1144 | receive_buffer); | |
4723ca09 NC |
1145 | if (result == 0) { |
1146 | ustcomm_del_sock(epoll_sock, 0); | |
72098143 NC |
1147 | } else { |
1148 | process_client_cmd(receive_header, | |
1149 | receive_buffer, | |
1150 | epoll_sock->fd); | |
4723ca09 NC |
1151 | } |
1152 | } | |
e625e919 | 1153 | pthread_cleanup_pop(1); /* release listener mutex */ |
4723ca09 | 1154 | } |
98963de4 | 1155 | } |
fc253ce0 PMF |
1156 | |
1157 | pthread_cleanup_pop(1); | |
98963de4 PMF |
1158 | } |
1159 | ||
cd03ff7f PMF |
1160 | /* These should only be accessed in the parent thread, |
1161 | * not the listener. | |
1162 | */ | |
ce45335c | 1163 | static volatile sig_atomic_t have_listener = 0; |
fc253ce0 | 1164 | static pthread_t listener_thread; |
4440ebcb | 1165 | |
98963de4 PMF |
1166 | void create_listener(void) |
1167 | { | |
c5fdc888 | 1168 | int result; |
f51d84ea PMF |
1169 | sigset_t sig_all_blocked; |
1170 | sigset_t orig_parent_mask; | |
98963de4 | 1171 | |
e9b58dc0 | 1172 | if (have_listener) { |
c5fdc888 | 1173 | WARN("not creating listener because we already had one"); |
4440ebcb | 1174 | return; |
c5fdc888 | 1175 | } |
4440ebcb | 1176 | |
f51d84ea PMF |
1177 | /* A new thread created by pthread_create inherits the signal mask |
1178 | * from the parent. To avoid any signal being received by the | |
1179 | * listener thread, we block all signals temporarily in the parent, | |
1180 | * while we create the listener thread. | |
1181 | */ | |
1182 | ||
1183 | sigfillset(&sig_all_blocked); | |
1184 | ||
1185 | result = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_parent_mask); | |
e9b58dc0 | 1186 | if (result) { |
f51d84ea PMF |
1187 | PERROR("pthread_sigmask: %s", strerror(result)); |
1188 | } | |
1189 | ||
cd03ff7f | 1190 | result = pthread_create(&listener_thread, NULL, listener_main, NULL); |
e9b58dc0 | 1191 | if (result == -1) { |
cd03ff7f | 1192 | PERROR("pthread_create"); |
98963de4 | 1193 | } |
4440ebcb | 1194 | |
f51d84ea PMF |
1195 | /* Restore original signal mask in parent */ |
1196 | result = pthread_sigmask(SIG_SETMASK, &orig_parent_mask, NULL); | |
e9b58dc0 | 1197 | if (result) { |
f51d84ea | 1198 | PERROR("pthread_sigmask: %s", strerror(result)); |
e9b58dc0 | 1199 | } else { |
4267e589 PMF |
1200 | have_listener = 1; |
1201 | } | |
98963de4 PMF |
1202 | } |
1203 | ||
5de74e51 PMF |
1204 | #define AUTOPROBE_DISABLED 0 |
1205 | #define AUTOPROBE_ENABLE_ALL 1 | |
1206 | #define AUTOPROBE_ENABLE_REGEX 2 | |
1207 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
1208 | static regex_t autoprobe_regex; | |
ef290fca | 1209 | |
20b37a31 | 1210 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
1211 | { |
1212 | int result; | |
1213 | ||
5de74e51 PMF |
1214 | char* concat_name = NULL; |
1215 | const char *probe_name = "default"; | |
ef290fca | 1216 | |
e9b58dc0 | 1217 | if (autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca | 1218 | return; |
e9b58dc0 | 1219 | } else if (autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
5de74e51 | 1220 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); |
e9b58dc0 | 1221 | if (result == -1) { |
5de74e51 PMF |
1222 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", |
1223 | m->channel, m->name); | |
1224 | return; | |
1225 | } | |
1226 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
1227 | free(concat_name); | |
1228 | return; | |
1229 | } | |
1230 | free(concat_name); | |
ef290fca PMF |
1231 | } |
1232 | ||
5de74e51 | 1233 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
e9b58dc0 | 1234 | if (result && result != -EEXIST) |
acbf228b | 1235 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); |
20b37a31 | 1236 | |
3ea1e2fc | 1237 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
ef290fca | 1238 | |
20b37a31 PMF |
1239 | } |
1240 | ||
4723ca09 NC |
1241 | static struct ustcomm_sock * init_app_socket(int epoll_fd) |
1242 | { | |
1243 | char *name; | |
1244 | int result; | |
1245 | struct ustcomm_sock *sock; | |
1246 | ||
1247 | result = asprintf(&name, "%s/%d", SOCK_DIR, (int)getpid()); | |
1248 | if (result < 0) { | |
1249 | ERR("string overflow allocating socket name, " | |
1250 | "UST thread bailing"); | |
1251 | return NULL; | |
1252 | } | |
1253 | ||
1254 | result = ensure_dir_exists(SOCK_DIR); | |
1255 | if (result == -1) { | |
1256 | ERR("Unable to create socket directory %s, UST thread bailing", | |
1257 | SOCK_DIR); | |
1258 | goto free_name; | |
1259 | } | |
1260 | ||
1261 | sock = ustcomm_init_named_socket(name, epoll_fd); | |
1262 | if (!sock) { | |
1263 | ERR("Error initializing named socket (%s). Check that directory" | |
1264 | "exists and that it is writable. UST thread bailing", name); | |
1265 | goto free_name; | |
1266 | } | |
1267 | ||
1268 | free(name); | |
1269 | return sock; | |
1270 | ||
1271 | free_name: | |
1272 | free(name); | |
1273 | return NULL; | |
1274 | } | |
1275 | ||
c1083aa8 | 1276 | static void __attribute__((constructor)) init() |
20b37a31 | 1277 | { |
49d70d5a | 1278 | struct timespec ts; |
20b37a31 | 1279 | int result; |
5de74e51 | 1280 | char* autoprobe_val = NULL; |
223f2e7c AH |
1281 | char* subbuffer_size_val = NULL; |
1282 | char* subbuffer_count_val = NULL; | |
1283 | unsigned int subbuffer_size; | |
1284 | unsigned int subbuffer_count; | |
1285 | unsigned int power; | |
20b37a31 | 1286 | |
ed1317e7 PMF |
1287 | /* Assign the pidunique, to be able to differentiate the processes with same |
1288 | * pid, (before and after an exec). | |
1289 | */ | |
1290 | pidunique = make_pidunique(); | |
bc237fab | 1291 | processpid = getpid(); |
ed1317e7 | 1292 | |
5de74e51 | 1293 | DBG("Tracectl constructor"); |
20b37a31 | 1294 | |
4723ca09 NC |
1295 | /* Set up epoll */ |
1296 | epoll_fd = epoll_create(MAX_EVENTS); | |
1297 | if (epoll_fd == -1) { | |
1298 | ERR("epoll_create failed, tracing shutting down"); | |
1299 | return; | |
1300 | } | |
1301 | ||
1302 | /* Create the socket */ | |
1303 | listen_sock = init_app_socket(epoll_fd); | |
1304 | if (!listen_sock) { | |
1305 | ERR("failed to create application socket," | |
1306 | " tracing shutting down"); | |
3847c3ba PMF |
1307 | return; |
1308 | } | |
2944a629 PMF |
1309 | |
1310 | create_listener(); | |
68c1021b | 1311 | |
9c6bb081 | 1312 | /* Get clock the clock source type */ |
49d70d5a | 1313 | |
9c6bb081 JD |
1314 | /* Default clock source */ |
1315 | ust_clock_source = CLOCK_TRACE; | |
1316 | if (clock_gettime(ust_clock_source, &ts) != 0) { | |
1317 | ust_clock_source = CLOCK_MONOTONIC; | |
1318 | DBG("UST traces will not be synchronized with LTTng traces"); | |
1319 | } | |
1320 | ||
5de74e51 | 1321 | autoprobe_val = getenv("UST_AUTOPROBE"); |
e9b58dc0 | 1322 | if (autoprobe_val) { |
4440ebcb PMF |
1323 | struct marker_iter iter; |
1324 | ||
08230db7 | 1325 | DBG("Autoprobe enabled."); |
4440ebcb PMF |
1326 | |
1327 | /* Ensure markers are initialized */ | |
1328 | //init_markers(); | |
1329 | ||
1330 | /* Ensure marker control is initialized, for the probe */ | |
1331 | init_marker_control(); | |
1332 | ||
1333 | /* first, set the callback that will connect the | |
1334 | * probe on new markers | |
1335 | */ | |
e9b58dc0 | 1336 | if (autoprobe_val[0] == '/') { |
5de74e51 PMF |
1337 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); |
1338 | if (result) { | |
1339 | char regexerr[150]; | |
1340 | ||
1341 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
1342 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
1343 | /* don't crash the application just for this */ | |
e9b58dc0 | 1344 | } else { |
5de74e51 PMF |
1345 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; |
1346 | } | |
e9b58dc0 | 1347 | } else { |
5de74e51 PMF |
1348 | /* just enable all instrumentation */ |
1349 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
1350 | } | |
1351 | ||
1352 | marker_set_new_marker_cb(auto_probe_connect); | |
1353 | ||
4440ebcb PMF |
1354 | /* Now, connect the probes that were already registered. */ |
1355 | marker_iter_reset(&iter); | |
1356 | marker_iter_start(&iter); | |
1357 | ||
08230db7 | 1358 | DBG("now iterating on markers already registered"); |
e9b58dc0 | 1359 | while (iter.marker) { |
eb5d20c6 MD |
1360 | DBG("now iterating on marker %s", (*iter.marker)->name); |
1361 | auto_probe_connect(*iter.marker); | |
4440ebcb PMF |
1362 | marker_iter_next(&iter); |
1363 | } | |
1364 | } | |
1365 | ||
e9b58dc0 | 1366 | if (getenv("UST_OVERWRITE")) { |
8649cd59 | 1367 | int val = atoi(getenv("UST_OVERWRITE")); |
e9b58dc0 | 1368 | if (val == 0 || val == 1) { |
0222e121 | 1369 | CMM_STORE_SHARED(ust_channels_overwrite_by_default, val); |
e9b58dc0 | 1370 | } else { |
8649cd59 PMF |
1371 | WARN("invalid value for UST_OVERWRITE"); |
1372 | } | |
1373 | } | |
1374 | ||
e9b58dc0 | 1375 | if (getenv("UST_AUTOCOLLECT")) { |
8649cd59 | 1376 | int val = atoi(getenv("UST_AUTOCOLLECT")); |
e9b58dc0 | 1377 | if (val == 0 || val == 1) { |
0222e121 | 1378 | CMM_STORE_SHARED(ust_channels_request_collection_by_default, val); |
e9b58dc0 | 1379 | } else { |
8649cd59 PMF |
1380 | WARN("invalid value for UST_AUTOCOLLECT"); |
1381 | } | |
1382 | } | |
1383 | ||
223f2e7c | 1384 | subbuffer_size_val = getenv("UST_SUBBUF_SIZE"); |
e9b58dc0 | 1385 | if (subbuffer_size_val) { |
223f2e7c AH |
1386 | sscanf(subbuffer_size_val, "%u", &subbuffer_size); |
1387 | power = pow2_higher_or_eq(subbuffer_size); | |
e9b58dc0 | 1388 | if (power != subbuffer_size) |
223f2e7c AH |
1389 | WARN("using the next power of two for buffer size = %u\n", power); |
1390 | chan_infos[LTT_CHANNEL_UST].def_subbufsize = power; | |
1391 | } | |
1392 | ||
1393 | subbuffer_count_val = getenv("UST_SUBBUF_NUM"); | |
e9b58dc0 | 1394 | if (subbuffer_count_val) { |
223f2e7c | 1395 | sscanf(subbuffer_count_val, "%u", &subbuffer_count); |
e9b58dc0 | 1396 | if (subbuffer_count < 2) |
223f2e7c AH |
1397 | subbuffer_count = 2; |
1398 | chan_infos[LTT_CHANNEL_UST].def_subbufcount = subbuffer_count; | |
1399 | } | |
1400 | ||
e9b58dc0 | 1401 | if (getenv("UST_TRACE")) { |
4db647c5 PMF |
1402 | char trace_name[] = "auto"; |
1403 | char trace_type[] = "ustrelay"; | |
1404 | ||
1405 | DBG("starting early tracing"); | |
1406 | ||
1407 | /* Ensure marker control is initialized */ | |
1408 | init_marker_control(); | |
1409 | ||
4db647c5 PMF |
1410 | /* Ensure markers are initialized */ |
1411 | init_markers(); | |
1412 | ||
e17571a5 PMF |
1413 | /* Ensure buffers are initialized, for the transport to be available. |
1414 | * We are about to set a trace type and it will fail without this. | |
1415 | */ | |
1416 | init_ustrelay_transport(); | |
1417 | ||
027ffc9d PMF |
1418 | /* FIXME: When starting early tracing (here), depending on the |
1419 | * order of constructors, it is very well possible some marker | |
1420 | * sections are not yet registered. Because of this, some | |
1421 | * channels may not be registered. Yet, we are about to ask the | |
1422 | * daemon to collect the channels. Channels which are not yet | |
1423 | * registered will not be collected. | |
1424 | * | |
1425 | * Currently, in LTTng, there is no way to add a channel after | |
1426 | * trace start. The reason for this is that it induces complex | |
1427 | * concurrency issues on the trace structures, which can only | |
1428 | * be resolved using RCU. This has not been done yet. As a | |
1429 | * workaround, we are forcing the registration of the "ust" | |
1430 | * channel here. This is the only channel (apart from metadata) | |
1431 | * that can be reliably used in early tracing. | |
1432 | * | |
1433 | * Non-early tracing does not have this problem and can use | |
1434 | * arbitrary channel names. | |
1435 | */ | |
20b37a31 | 1436 | ltt_channels_register("ust"); |
4db647c5 PMF |
1437 | |
1438 | result = ltt_trace_setup(trace_name); | |
e9b58dc0 | 1439 | if (result < 0) { |
4db647c5 PMF |
1440 | ERR("ltt_trace_setup failed"); |
1441 | return; | |
1442 | } | |
1443 | ||
1444 | result = ltt_trace_set_type(trace_name, trace_type); | |
e9b58dc0 | 1445 | if (result < 0) { |
4db647c5 PMF |
1446 | ERR("ltt_trace_set_type failed"); |
1447 | return; | |
1448 | } | |
1449 | ||
1450 | result = ltt_trace_alloc(trace_name); | |
e9b58dc0 | 1451 | if (result < 0) { |
4db647c5 PMF |
1452 | ERR("ltt_trace_alloc failed"); |
1453 | return; | |
1454 | } | |
1455 | ||
1456 | result = ltt_trace_start(trace_name); | |
e9b58dc0 | 1457 | if (result < 0) { |
4db647c5 PMF |
1458 | ERR("ltt_trace_start failed"); |
1459 | return; | |
1460 | } | |
60e57148 PMF |
1461 | |
1462 | /* Do this after the trace is started in order to avoid creating confusion | |
1463 | * if the trace fails to start. */ | |
1464 | inform_consumer_daemon(trace_name); | |
4db647c5 PMF |
1465 | } |
1466 | ||
68c1021b PMF |
1467 | return; |
1468 | ||
1469 | /* should decrementally destroy stuff if error */ | |
1470 | ||
1471 | } | |
1472 | ||
1473 | /* This is only called if we terminate normally, not with an unhandled signal, | |
6d45c11a PMF |
1474 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
1475 | * the last sub-buffer contain a valid end time for the trace. This is done | |
1476 | * automatically only when the trace is properly stopped. | |
1477 | * | |
1478 | * If the traced program crashed, it is always possible to manually add the | |
1479 | * right value in the header, or to open the trace in text mode. | |
1480 | * | |
1481 | * FIXME: Fix LTTV so it doesn't need this. | |
1482 | */ | |
68c1021b | 1483 | |
6d45c11a | 1484 | static void destroy_traces(void) |
68c1021b | 1485 | { |
6d45c11a | 1486 | int result; |
a584bc4e PMF |
1487 | |
1488 | /* if trace running, finish it */ | |
1489 | ||
6d45c11a | 1490 | DBG("destructor stopping traces"); |
a584bc4e | 1491 | |
6d45c11a | 1492 | result = ltt_trace_stop("auto"); |
e9b58dc0 | 1493 | if (result == -1) { |
6d45c11a PMF |
1494 | ERR("ltt_trace_stop error"); |
1495 | } | |
1496 | ||
31d392f1 | 1497 | result = ltt_trace_destroy("auto", 0); |
e9b58dc0 | 1498 | if (result == -1) { |
6d45c11a PMF |
1499 | ERR("ltt_trace_destroy error"); |
1500 | } | |
68c1021b | 1501 | } |
1e2944cb | 1502 | |
97d9b88b PMF |
1503 | static int trace_recording(void) |
1504 | { | |
1505 | int retval = 0; | |
b73a4c47 | 1506 | struct ust_trace *trace; |
97d9b88b PMF |
1507 | |
1508 | ltt_lock_traces(); | |
1509 | ||
0222e121 | 1510 | cds_list_for_each_entry(trace, <t_traces.head, list) { |
e9b58dc0 | 1511 | if (trace->active) { |
97d9b88b PMF |
1512 | retval = 1; |
1513 | break; | |
1514 | } | |
1515 | } | |
1516 | ||
1517 | ltt_unlock_traces(); | |
1518 | ||
1519 | return retval; | |
1520 | } | |
1521 | ||
f293009f | 1522 | int restarting_usleep(useconds_t usecs) |
97d9b88b | 1523 | { |
72098143 NC |
1524 | struct timespec tv; |
1525 | int result; | |
1526 | ||
1527 | tv.tv_sec = 0; | |
1528 | tv.tv_nsec = usecs * 1000; | |
1529 | ||
1530 | do { | |
e9b58dc0 DS |
1531 | result = nanosleep(&tv, &tv); |
1532 | } while (result == -1 && errno == EINTR); | |
97d9b88b PMF |
1533 | |
1534 | return result; | |
1535 | } | |
1536 | ||
4267e589 | 1537 | static void stop_listener(void) |
fc253ce0 PMF |
1538 | { |
1539 | int result; | |
1540 | ||
e9b58dc0 | 1541 | if (!have_listener) |
4267e589 PMF |
1542 | return; |
1543 | ||
fc253ce0 | 1544 | result = pthread_cancel(listener_thread); |
e9b58dc0 | 1545 | if (result != 0) { |
18cbdbac | 1546 | ERR("pthread_cancel: %s", strerror(result)); |
fc253ce0 PMF |
1547 | } |
1548 | result = pthread_join(listener_thread, NULL); | |
e9b58dc0 | 1549 | if (result != 0) { |
18cbdbac | 1550 | ERR("pthread_join: %s", strerror(result)); |
fc253ce0 PMF |
1551 | } |
1552 | } | |
1553 | ||
f293009f | 1554 | /* This destructor keeps the process alive for a few seconds in order |
9dc7b7ff | 1555 | * to leave time for ustconsumer to connect to its buffers. This is necessary |
f293009f PMF |
1556 | * for programs whose execution is very short. It is also useful in all |
1557 | * programs when tracing is started close to the end of the program | |
1558 | * execution. | |
1559 | * | |
1560 | * FIXME: For now, this only works for the first trace created in a | |
1561 | * process. | |
1562 | */ | |
1563 | ||
97d9b88b PMF |
1564 | static void __attribute__((destructor)) keepalive() |
1565 | { | |
bc237fab NC |
1566 | if (processpid != getpid()) { |
1567 | return; | |
1568 | } | |
1569 | ||
0222e121 | 1570 | if (trace_recording() && CMM_LOAD_SHARED(buffers_to_export)) { |
c472cce0 | 1571 | int total = 0; |
f293009f | 1572 | DBG("Keeping process alive for consumer daemon..."); |
0222e121 | 1573 | while (CMM_LOAD_SHARED(buffers_to_export)) { |
f293009f | 1574 | const int interv = 200000; |
c472cce0 | 1575 | restarting_usleep(interv); |
f293009f PMF |
1576 | total += interv; |
1577 | ||
e9b58dc0 | 1578 | if (total >= 3000000) { |
c472cce0 | 1579 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
f293009f PMF |
1580 | break; |
1581 | } | |
1582 | } | |
1583 | DBG("Finally dying..."); | |
1584 | } | |
6d45c11a PMF |
1585 | |
1586 | destroy_traces(); | |
1587 | ||
fc253ce0 PMF |
1588 | /* Ask the listener to stop and clean up. */ |
1589 | stop_listener(); | |
97d9b88b | 1590 | } |
97d9b88b | 1591 | |
775c8a3f | 1592 | void ust_potential_exec(void) |
c396a841 PMF |
1593 | { |
1594 | trace_mark(ust, potential_exec, MARK_NOARGS); | |
1595 | ||
775c8a3f PMF |
1596 | DBG("test"); |
1597 | ||
c396a841 PMF |
1598 | keepalive(); |
1599 | } | |
1600 | ||
1e2944cb PMF |
1601 | /* Notify ust that there was a fork. This needs to be called inside |
1602 | * the new process, anytime a process whose memory is not shared with | |
1603 | * the parent is created. If this function is not called, the events | |
1604 | * of the new process will not be collected. | |
616ed36a PMF |
1605 | * |
1606 | * Signals should be disabled before the fork and reenabled only after | |
1607 | * this call in order to guarantee tracing is not started before ust_fork() | |
1608 | * sanitizes the new process. | |
1e2944cb PMF |
1609 | */ |
1610 | ||
616ed36a | 1611 | static void ust_fork(void) |
1e2944cb | 1612 | { |
4723ca09 NC |
1613 | struct ust_buffer *buf, *buf_tmp; |
1614 | struct ustcomm_sock *sock, *sock_tmp; | |
1d471d9f | 1615 | struct ust_trace *trace, *trace_tmp; |
99b72dc0 PMF |
1616 | int result; |
1617 | ||
31d392f1 | 1618 | /* FIXME: technically, the locks could have been taken before the fork */ |
1e2944cb | 1619 | DBG("ust: forking"); |
73850001 | 1620 | |
bc237fab NC |
1621 | /* Get the pid of the new process */ |
1622 | processpid = getpid(); | |
1623 | ||
1d471d9f NC |
1624 | /* |
1625 | * FIXME: This could be prettier, we loop over the list twice and | |
1626 | * following good locking practice should lock around the loop | |
1627 | */ | |
1628 | cds_list_for_each_entry_safe(trace, trace_tmp, <t_traces.head, list) { | |
1629 | ltt_trace_stop(trace->trace_name); | |
1630 | } | |
1631 | ||
4723ca09 | 1632 | /* Delete all active connections, but leave them in the epoll set */ |
0222e121 | 1633 | cds_list_for_each_entry_safe(sock, sock_tmp, &ust_socks, list) { |
4723ca09 NC |
1634 | ustcomm_del_sock(sock, 1); |
1635 | } | |
99b72dc0 PMF |
1636 | |
1637 | /* Delete all blocked consumers */ | |
0222e121 | 1638 | cds_list_for_each_entry_safe(buf, buf_tmp, &open_buffers_list, |
4723ca09 | 1639 | open_buffers_list) { |
0222e121 | 1640 | cds_list_del(&buf->open_buffers_list); |
99b72dc0 PMF |
1641 | } |
1642 | ||
1d471d9f NC |
1643 | /* |
1644 | * FIXME: This could be prettier, we loop over the list twice and | |
1645 | * following good locking practice should lock around the loop | |
1646 | */ | |
1647 | cds_list_for_each_entry_safe(trace, trace_tmp, <t_traces.head, list) { | |
1648 | ltt_trace_destroy(trace->trace_name, 1); | |
1649 | } | |
3659d94c | 1650 | |
fd9c2963 MD |
1651 | /* Clean up the listener socket and epoll, keeping the socket file */ |
1652 | if (listen_sock) { | |
1653 | ustcomm_del_named_sock(listen_sock, 1); | |
1654 | listen_sock = NULL; | |
1655 | } | |
4723ca09 | 1656 | close(epoll_fd); |
393bc391 | 1657 | |
4723ca09 | 1658 | /* Re-start the launch sequence */ |
0222e121 | 1659 | CMM_STORE_SHARED(buffers_to_export, 0); |
1e2944cb | 1660 | have_listener = 0; |
4723ca09 NC |
1661 | |
1662 | /* Set up epoll */ | |
1663 | epoll_fd = epoll_create(MAX_EVENTS); | |
1664 | if (epoll_fd == -1) { | |
1665 | ERR("epoll_create failed, tracing shutting down"); | |
1666 | return; | |
1667 | } | |
1668 | ||
1669 | /* Create the socket */ | |
1670 | listen_sock = init_app_socket(epoll_fd); | |
1671 | if (!listen_sock) { | |
1672 | ERR("failed to create application socket," | |
1673 | " tracing shutting down"); | |
1674 | return; | |
1675 | } | |
9fb49d0e | 1676 | create_listener(); |
99b72dc0 PMF |
1677 | ltt_trace_setup("auto"); |
1678 | result = ltt_trace_set_type("auto", "ustrelay"); | |
e9b58dc0 | 1679 | if (result < 0) { |
99b72dc0 | 1680 | ERR("ltt_trace_set_type failed"); |
036db133 | 1681 | return; |
99b72dc0 PMF |
1682 | } |
1683 | ||
1684 | ltt_trace_alloc("auto"); | |
1685 | ltt_trace_start("auto"); | |
ad45e833 | 1686 | inform_consumer_daemon("auto"); |
1e2944cb PMF |
1687 | } |
1688 | ||
616ed36a PMF |
1689 | void ust_before_fork(ust_fork_info_t *fork_info) |
1690 | { | |
1691 | /* Disable signals. This is to avoid that the child | |
1692 | * intervenes before it is properly setup for tracing. It is | |
1693 | * safer to disable all signals, because then we know we are not | |
1694 | * breaking anything by restoring the original mask. | |
1695 | */ | |
1696 | sigset_t all_sigs; | |
1697 | int result; | |
1698 | ||
1699 | /* FIXME: | |
1700 | - only do this if tracing is active | |
1701 | */ | |
1702 | ||
1703 | /* Disable signals */ | |
1704 | sigfillset(&all_sigs); | |
1705 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); | |
e9b58dc0 | 1706 | if (result == -1) { |
616ed36a PMF |
1707 | PERROR("sigprocmask"); |
1708 | return; | |
1709 | } | |
fd9c2963 MD |
1710 | |
1711 | /* | |
1712 | * Take the fork lock to make sure we are not in the middle of | |
1713 | * something in the listener thread. | |
1714 | */ | |
1715 | pthread_mutex_lock(&listener_thread_data_mutex); | |
1716 | /* | |
1717 | * Hold listen_sock_mutex to protect from listen_sock teardown. | |
1718 | */ | |
1719 | pthread_mutex_lock(&listen_sock_mutex); | |
1d7304a3 | 1720 | rcu_bp_before_fork(); |
616ed36a PMF |
1721 | } |
1722 | ||
1723 | /* Don't call this function directly in a traced program */ | |
1724 | static void ust_after_fork_common(ust_fork_info_t *fork_info) | |
1725 | { | |
1726 | int result; | |
616ed36a | 1727 | |
fd9c2963 MD |
1728 | pthread_mutex_unlock(&listen_sock_mutex); |
1729 | pthread_mutex_unlock(&listener_thread_data_mutex); | |
1730 | ||
616ed36a PMF |
1731 | /* Restore signals */ |
1732 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); | |
e9b58dc0 | 1733 | if (result == -1) { |
616ed36a PMF |
1734 | PERROR("sigprocmask"); |
1735 | return; | |
1736 | } | |
1737 | } | |
1738 | ||
1739 | void ust_after_fork_parent(ust_fork_info_t *fork_info) | |
1740 | { | |
1d7304a3 | 1741 | rcu_bp_after_fork_parent(); |
0b362d6f | 1742 | /* Release mutexes and reenable signals */ |
616ed36a PMF |
1743 | ust_after_fork_common(fork_info); |
1744 | } | |
1745 | ||
1746 | void ust_after_fork_child(ust_fork_info_t *fork_info) | |
1747 | { | |
1d7304a3 MD |
1748 | /* Release urcu mutexes */ |
1749 | rcu_bp_after_fork_child(); | |
1750 | ||
1751 | /* Sanitize the child */ | |
616ed36a PMF |
1752 | ust_fork(); |
1753 | ||
0b362d6f | 1754 | /* Then release mutexes and reenable signals */ |
616ed36a PMF |
1755 | ust_after_fork_common(fork_info); |
1756 | } | |
1757 |