Commit | Line | Data |
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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 | ||
872037bb | 18 | #define _GNU_SOURCE |
68c1021b PMF |
19 | #include <stdio.h> |
20 | #include <stdint.h> | |
21 | #include <signal.h> | |
22 | #include <sys/types.h> | |
23 | #include <sys/socket.h> | |
24 | #include <sys/un.h> | |
98963de4 | 25 | #include <sched.h> |
a584bc4e | 26 | #include <fcntl.h> |
3a7b90de | 27 | #include <poll.h> |
ef290fca | 28 | #include <regex.h> |
fbd8191b | 29 | |
b7ea1a1c | 30 | #include <urcu-bp.h> |
26cc7017 | 31 | |
93d0f2ea | 32 | #include <ust/marker.h> |
616ed36a | 33 | #include <ust/tracectl.h> |
c93858f1 | 34 | #include "tracer.h" |
6af64c43 | 35 | #include "usterr.h" |
d0b5f2b9 | 36 | #include "ustcomm.h" |
b73a4c47 | 37 | #include "buffers.h" |
9160b4e4 | 38 | #include "marker-control.h" |
fbd8191b | 39 | |
b02e31e5 | 40 | //#define USE_CLONE |
3847c3ba | 41 | |
68c1021b PMF |
42 | #define USTSIGNAL SIGIO |
43 | ||
98963de4 PMF |
44 | #define MAX_MSG_SIZE (100) |
45 | #define MSG_NOTIF 1 | |
46 | #define MSG_REGISTER_NOTIF 2 | |
47 | ||
a584bc4e PMF |
48 | char consumer_stack[10000]; |
49 | ||
ed1317e7 PMF |
50 | /* This should only be accessed by the constructor, before the creation |
51 | * of the listener, and then only by the listener. | |
52 | */ | |
53 | s64 pidunique = -1LL; | |
54 | ||
3a7b90de PMF |
55 | struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers); |
56 | ||
d0b5f2b9 PMF |
57 | static struct ustcomm_app ustcomm_app; |
58 | ||
68c1021b PMF |
59 | struct tracecmd { /* no padding */ |
60 | uint32_t size; | |
61 | uint16_t command; | |
62 | }; | |
63 | ||
f293009f PMF |
64 | /* volatile because shared between the listener and the main thread */ |
65 | volatile sig_atomic_t buffers_to_export = 0; | |
66 | ||
98963de4 PMF |
67 | struct trctl_msg { |
68 | /* size: the size of all the fields except size itself */ | |
69 | uint32_t size; | |
70 | uint16_t type; | |
71 | /* Only the necessary part of the payload is transferred. It | |
72 | * may even be none of it. | |
73 | */ | |
74 | char payload[94]; | |
75 | }; | |
68c1021b | 76 | |
a584bc4e PMF |
77 | struct consumer_channel { |
78 | int fd; | |
79 | struct ltt_channel_struct *chan; | |
80 | }; | |
81 | ||
3a7b90de PMF |
82 | struct blocked_consumer { |
83 | int fd_consumer; | |
84 | int fd_producer; | |
85 | int tmp_poll_idx; | |
86 | ||
87 | /* args to ustcomm_send_reply */ | |
88 | struct ustcomm_server server; | |
89 | struct ustcomm_source src; | |
90 | ||
b73a4c47 | 91 | /* args to ust_buffers_get_subbuf */ |
b5b073e2 | 92 | struct ust_buffer *buf; |
3a7b90de PMF |
93 | |
94 | struct list_head list; | |
95 | }; | |
96 | ||
ed1317e7 PMF |
97 | static long long make_pidunique(void) |
98 | { | |
99 | s64 retval; | |
100 | struct timeval tv; | |
101 | ||
102 | gettimeofday(&tv, NULL); | |
103 | ||
104 | retval = tv.tv_sec; | |
105 | retval <<= 32; | |
106 | retval |= tv.tv_usec; | |
107 | ||
108 | return retval; | |
109 | } | |
110 | ||
52c51a47 | 111 | static void print_markers(FILE *fp) |
fbd8191b PMF |
112 | { |
113 | struct marker_iter iter; | |
114 | ||
d0b5f2b9 | 115 | lock_markers(); |
fbd8191b PMF |
116 | marker_iter_reset(&iter); |
117 | marker_iter_start(&iter); | |
118 | ||
119 | while(iter.marker) { | |
3ea1e2fc | 120 | fprintf(fp, "marker: %s/%s %d \"%s\" %p\n", iter.marker->channel, iter.marker->name, (int)imv_read(iter.marker->state), iter.marker->format, iter.marker->location); |
fbd8191b PMF |
121 | marker_iter_next(&iter); |
122 | } | |
d0b5f2b9 | 123 | unlock_markers(); |
fbd8191b PMF |
124 | } |
125 | ||
4440ebcb | 126 | static int init_socket(void); |
68c1021b | 127 | |
26cc7017 PMF |
128 | /* This needs to be called whenever a new thread is created. It notifies |
129 | * liburcu of the new thread. | |
130 | */ | |
131 | ||
132 | void ust_register_thread(void) | |
68c1021b | 133 | { |
26cc7017 | 134 | rcu_register_thread(); |
68c1021b PMF |
135 | } |
136 | ||
98963de4 PMF |
137 | int fd_notif = -1; |
138 | void notif_cb(void) | |
139 | { | |
140 | int result; | |
141 | struct trctl_msg msg; | |
142 | ||
143 | /* FIXME: fd_notif should probably be protected by a spinlock */ | |
144 | ||
145 | if(fd_notif == -1) | |
146 | return; | |
147 | ||
148 | msg.type = MSG_NOTIF; | |
149 | msg.size = sizeof(msg.type); | |
150 | ||
151 | /* FIXME: don't block here */ | |
152 | result = write(fd_notif, &msg, msg.size+sizeof(msg.size)); | |
153 | if(result == -1) { | |
154 | PERROR("write"); | |
155 | return; | |
156 | } | |
157 | } | |
158 | ||
ad45e833 PMF |
159 | /* Ask the daemon to collect a trace called trace_name and being |
160 | * produced by this pid. | |
161 | * | |
162 | * The trace must be at least allocated. (It can also be started.) | |
163 | * This is because _ltt_trace_find is used. | |
164 | */ | |
165 | ||
166 | static void inform_consumer_daemon(const char *trace_name) | |
d0b5f2b9 | 167 | { |
204141ee | 168 | int i,j; |
b73a4c47 | 169 | struct ust_trace *trace; |
ad45e833 PMF |
170 | pid_t pid = getpid(); |
171 | int result; | |
172 | ||
173 | ltt_lock_traces(); | |
174 | ||
175 | trace = _ltt_trace_find(trace_name); | |
176 | if(trace == NULL) { | |
177 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); | |
178 | goto finish; | |
179 | } | |
180 | ||
181 | for(i=0; i < trace->nr_channels; i++) { | |
204141ee PMF |
182 | /* iterate on all cpus */ |
183 | for(j=0; j<trace->channels[i].n_cpus; j++) { | |
184 | char *buf; | |
185 | asprintf(&buf, "%s_%d", trace->channels[i].channel_name, j); | |
186 | result = ustcomm_request_consumer(pid, buf); | |
187 | if(result == -1) { | |
188 | WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name); | |
189 | /* continue even if fail */ | |
190 | } | |
191 | free(buf); | |
192 | buffers_to_export++; | |
ad45e833 PMF |
193 | } |
194 | } | |
195 | ||
196 | finish: | |
197 | ltt_unlock_traces(); | |
d0b5f2b9 | 198 | } |
fbd8191b | 199 | |
3a7b90de PMF |
200 | void process_blocked_consumers(void) |
201 | { | |
202 | int n_fds = 0; | |
203 | struct pollfd *fds; | |
204 | struct blocked_consumer *bc; | |
205 | int idx = 0; | |
206 | char inbuf; | |
207 | int result; | |
208 | ||
209 | list_for_each_entry(bc, &blocked_consumers, list) { | |
210 | n_fds++; | |
211 | } | |
212 | ||
213 | fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); | |
214 | if(fds == NULL) { | |
215 | ERR("malloc returned NULL"); | |
216 | return; | |
217 | } | |
218 | ||
219 | list_for_each_entry(bc, &blocked_consumers, list) { | |
220 | fds[idx].fd = bc->fd_producer; | |
221 | fds[idx].events = POLLIN; | |
222 | bc->tmp_poll_idx = idx; | |
223 | idx++; | |
224 | } | |
225 | ||
69ba0156 PMF |
226 | while((result = poll(fds, n_fds, 0)) == -1 && errno == EINTR) |
227 | /* nothing */; | |
3a7b90de PMF |
228 | if(result == -1) { |
229 | PERROR("poll"); | |
872037bb | 230 | return; |
3a7b90de PMF |
231 | } |
232 | ||
233 | list_for_each_entry(bc, &blocked_consumers, list) { | |
234 | if(fds[bc->tmp_poll_idx].revents) { | |
235 | long consumed_old = 0; | |
236 | char *reply; | |
237 | ||
238 | result = read(bc->fd_producer, &inbuf, 1); | |
239 | if(result == -1) { | |
240 | PERROR("read"); | |
241 | continue; | |
242 | } | |
243 | if(result == 0) { | |
244 | DBG("PRODUCER END"); | |
245 | ||
246 | close(bc->fd_producer); | |
247 | ||
769d0157 | 248 | list_del(&bc->list); |
3a7b90de PMF |
249 | |
250 | result = ustcomm_send_reply(&bc->server, "END", &bc->src); | |
251 | if(result < 0) { | |
252 | ERR("ustcomm_send_reply failed"); | |
253 | continue; | |
254 | } | |
255 | ||
256 | continue; | |
257 | } | |
258 | ||
b73a4c47 | 259 | result = ust_buffers_get_subbuf(bc->buf, &consumed_old); |
3a7b90de PMF |
260 | if(result == -EAGAIN) { |
261 | WARN("missed buffer?"); | |
262 | continue; | |
263 | } | |
264 | else if(result < 0) { | |
b73a4c47 | 265 | DBG("ust_buffers_get_subbuf: error: %s", strerror(-result)); |
3a7b90de PMF |
266 | } |
267 | asprintf(&reply, "%s %ld", "OK", consumed_old); | |
268 | result = ustcomm_send_reply(&bc->server, reply, &bc->src); | |
269 | if(result < 0) { | |
270 | ERR("ustcomm_send_reply failed"); | |
271 | free(reply); | |
272 | continue; | |
273 | } | |
274 | free(reply); | |
275 | ||
769d0157 | 276 | list_del(&bc->list); |
3a7b90de PMF |
277 | } |
278 | } | |
279 | ||
280 | } | |
281 | ||
204141ee PMF |
282 | void seperate_channel_cpu(const char *channel_and_cpu, char **channel, int *cpu) |
283 | { | |
284 | const char *sep; | |
285 | ||
286 | sep = rindex(channel_and_cpu, '_'); | |
287 | if(sep == NULL) { | |
288 | *cpu = -1; | |
289 | sep = channel_and_cpu + strlen(channel_and_cpu); | |
290 | } | |
291 | else { | |
292 | *cpu = atoi(sep+1); | |
293 | } | |
294 | ||
295 | asprintf(channel, "%.*s", (int)(sep-channel_and_cpu), channel_and_cpu); | |
296 | } | |
297 | ||
298 | static int do_cmd_get_shmid(const char *recvbuf, struct ustcomm_source *src) | |
299 | { | |
300 | int retval = 0; | |
b73a4c47 | 301 | struct ust_trace *trace; |
204141ee PMF |
302 | char trace_name[] = "auto"; |
303 | int i; | |
304 | char *channel_and_cpu; | |
305 | int found = 0; | |
306 | int result; | |
307 | char *ch_name; | |
308 | int ch_cpu; | |
309 | ||
310 | DBG("get_shmid"); | |
311 | ||
312 | channel_and_cpu = nth_token(recvbuf, 1); | |
313 | if(channel_and_cpu == NULL) { | |
27e84572 | 314 | ERR("cannot parse channel"); |
204141ee PMF |
315 | goto end; |
316 | } | |
317 | ||
318 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
319 | if(ch_cpu == -1) { | |
27e84572 | 320 | ERR("problem parsing channel name"); |
204141ee PMF |
321 | goto free_short_chan_name; |
322 | } | |
323 | ||
324 | ltt_lock_traces(); | |
325 | trace = _ltt_trace_find(trace_name); | |
326 | ltt_unlock_traces(); | |
327 | ||
328 | if(trace == NULL) { | |
329 | ERR("cannot find trace!"); | |
330 | retval = -1; | |
331 | goto free_short_chan_name; | |
332 | } | |
333 | ||
334 | for(i=0; i<trace->nr_channels; i++) { | |
335 | struct ust_channel *channel = &trace->channels[i]; | |
336 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
337 | ||
338 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
339 | char *reply; | |
340 | ||
341 | // DBG("the shmid for the requested channel is %d", buf->shmid); | |
342 | // DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids); | |
343 | asprintf(&reply, "%d %d", buf->shmid, channel->buf_struct_shmids[ch_cpu]); | |
344 | ||
345 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
346 | if(result) { | |
27e84572 | 347 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
348 | free(reply); |
349 | retval = -1; | |
350 | goto free_short_chan_name; | |
351 | } | |
352 | ||
353 | free(reply); | |
354 | ||
355 | found = 1; | |
356 | break; | |
357 | } | |
358 | } | |
359 | ||
d5adede0 | 360 | if(!found) { |
27e84572 | 361 | ERR("channel not found (%s)", channel_and_cpu); |
204141ee PMF |
362 | } |
363 | ||
364 | free_short_chan_name: | |
365 | free(ch_name); | |
366 | ||
367 | end: | |
368 | return retval; | |
369 | } | |
370 | ||
371 | static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src) | |
372 | { | |
373 | int retval = 0; | |
b73a4c47 | 374 | struct ust_trace *trace; |
204141ee PMF |
375 | char trace_name[] = "auto"; |
376 | int i; | |
377 | char *channel_and_cpu; | |
378 | int found = 0; | |
379 | int result; | |
380 | char *ch_name; | |
381 | int ch_cpu; | |
382 | ||
383 | DBG("get_n_subbufs"); | |
384 | ||
385 | channel_and_cpu = nth_token(recvbuf, 1); | |
386 | if(channel_and_cpu == NULL) { | |
27e84572 | 387 | ERR("cannot parse channel"); |
204141ee PMF |
388 | goto end; |
389 | } | |
390 | ||
391 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
392 | if(ch_cpu == -1) { | |
27e84572 | 393 | ERR("problem parsing channel name"); |
204141ee PMF |
394 | goto free_short_chan_name; |
395 | } | |
396 | ||
397 | ltt_lock_traces(); | |
398 | trace = _ltt_trace_find(trace_name); | |
399 | ltt_unlock_traces(); | |
400 | ||
401 | if(trace == NULL) { | |
402 | ERR("cannot find trace!"); | |
403 | retval = -1; | |
404 | goto free_short_chan_name; | |
405 | } | |
406 | ||
407 | for(i=0; i<trace->nr_channels; i++) { | |
408 | struct ust_channel *channel = &trace->channels[i]; | |
409 | ||
410 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
411 | char *reply; | |
412 | ||
413 | DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt); | |
414 | asprintf(&reply, "%d", channel->subbuf_cnt); | |
415 | ||
416 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
417 | if(result) { | |
27e84572 | 418 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
419 | free(reply); |
420 | retval = -1; | |
421 | goto free_short_chan_name; | |
422 | } | |
423 | ||
424 | free(reply); | |
425 | found = 1; | |
426 | break; | |
427 | } | |
428 | } | |
429 | if(found == 0) { | |
27e84572 | 430 | ERR("unable to find channel"); |
204141ee PMF |
431 | } |
432 | ||
433 | free_short_chan_name: | |
434 | free(ch_name); | |
435 | ||
436 | end: | |
437 | return retval; | |
438 | } | |
439 | ||
440 | static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src) | |
441 | { | |
442 | int retval = 0; | |
b73a4c47 | 443 | struct ust_trace *trace; |
204141ee PMF |
444 | char trace_name[] = "auto"; |
445 | int i; | |
446 | char *channel_and_cpu; | |
447 | int found = 0; | |
448 | int result; | |
449 | char *ch_name; | |
450 | int ch_cpu; | |
451 | ||
452 | DBG("get_subbuf_size"); | |
453 | ||
454 | channel_and_cpu = nth_token(recvbuf, 1); | |
455 | if(channel_and_cpu == NULL) { | |
27e84572 | 456 | ERR("cannot parse channel"); |
204141ee PMF |
457 | goto end; |
458 | } | |
459 | ||
460 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
461 | if(ch_cpu == -1) { | |
27e84572 | 462 | ERR("problem parsing channel name"); |
204141ee PMF |
463 | goto free_short_chan_name; |
464 | } | |
465 | ||
466 | ltt_lock_traces(); | |
467 | trace = _ltt_trace_find(trace_name); | |
468 | ltt_unlock_traces(); | |
469 | ||
470 | if(trace == NULL) { | |
471 | ERR("cannot find trace!"); | |
472 | retval = -1; | |
473 | goto free_short_chan_name; | |
474 | } | |
475 | ||
476 | for(i=0; i<trace->nr_channels; i++) { | |
477 | struct ust_channel *channel = &trace->channels[i]; | |
478 | ||
479 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
480 | char *reply; | |
481 | ||
482 | DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size); | |
483 | asprintf(&reply, "%zd", channel->subbuf_size); | |
484 | ||
485 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
486 | if(result) { | |
27e84572 | 487 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
488 | free(reply); |
489 | retval = -1; | |
490 | goto free_short_chan_name; | |
491 | } | |
492 | ||
493 | free(reply); | |
494 | found = 1; | |
495 | break; | |
496 | } | |
497 | } | |
498 | if(found == 0) { | |
27e84572 | 499 | ERR("unable to find channel"); |
204141ee PMF |
500 | } |
501 | ||
502 | free_short_chan_name: | |
503 | free(ch_name); | |
504 | ||
505 | end: | |
506 | return retval; | |
507 | } | |
508 | ||
e43efba9 | 509 | static unsigned int poweroftwo(unsigned int x) |
763f41e5 DS |
510 | { |
511 | unsigned int power2 = 1; | |
512 | unsigned int hardcoded = 2147483648; /* FIX max 2^31 */ | |
513 | ||
514 | if (x < 2) | |
515 | return 2; | |
516 | ||
517 | while (power2 < x && power2 < hardcoded) | |
518 | power2 *= 2; | |
519 | ||
520 | return power2; | |
521 | } | |
522 | ||
523 | static int do_cmd_set_subbuf_size(const char *recvbuf, struct ustcomm_source *src) | |
524 | { | |
525 | char *channel_slash_size; | |
526 | char ch_name[256]=""; | |
527 | unsigned int size, power; | |
528 | int retval = 0; | |
529 | struct ust_trace *trace; | |
530 | char trace_name[] = "auto"; | |
531 | int i; | |
532 | int found = 0; | |
533 | ||
534 | DBG("set_subbuf_size"); | |
535 | ||
536 | channel_slash_size = nth_token(recvbuf, 1); | |
537 | sscanf(channel_slash_size, "%255[^/]/%u", ch_name, &size); | |
538 | ||
539 | if(ch_name == NULL) { | |
540 | ERR("cannot parse channel"); | |
541 | goto end; | |
542 | } | |
543 | ||
544 | power = poweroftwo(size); | |
545 | if (power != size) | |
546 | WARN("using the next 2^n = %u\n", power); | |
547 | ||
548 | ltt_lock_traces(); | |
549 | trace = _ltt_trace_find_setup(trace_name); | |
550 | if(trace == NULL) { | |
551 | ERR("cannot find trace!"); | |
763f41e5 DS |
552 | retval = -1; |
553 | goto end; | |
554 | } | |
555 | ||
556 | for(i = 0; i < trace->nr_channels; i++) { | |
557 | struct ust_channel *channel = &trace->channels[i]; | |
558 | ||
559 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
560 | ||
561 | channel->subbuf_size = power; | |
562 | DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size); | |
563 | ||
564 | found = 1; | |
565 | break; | |
566 | } | |
567 | } | |
568 | if(found == 0) { | |
569 | ERR("unable to find channel"); | |
570 | } | |
571 | ||
763f41e5 | 572 | end: |
86dd0ebc | 573 | ltt_unlock_traces(); |
763f41e5 DS |
574 | return retval; |
575 | } | |
576 | ||
577 | static int do_cmd_set_subbuf_num(const char *recvbuf, struct ustcomm_source *src) | |
578 | { | |
579 | char *channel_slash_num; | |
580 | char ch_name[256]=""; | |
581 | unsigned int num; | |
582 | int retval = 0; | |
583 | struct ust_trace *trace; | |
584 | char trace_name[] = "auto"; | |
585 | int i; | |
586 | int found = 0; | |
587 | ||
588 | DBG("set_subbuf_num"); | |
589 | ||
590 | channel_slash_num = nth_token(recvbuf, 1); | |
591 | sscanf(channel_slash_num, "%255[^/]/%u", ch_name, &num); | |
592 | ||
593 | if(ch_name == NULL) { | |
594 | ERR("cannot parse channel"); | |
595 | goto end; | |
596 | } | |
597 | if (num < 2) { | |
598 | ERR("subbuffer count should be greater than 2"); | |
599 | goto end; | |
600 | } | |
601 | ||
602 | ltt_lock_traces(); | |
603 | trace = _ltt_trace_find_setup(trace_name); | |
604 | if(trace == NULL) { | |
605 | ERR("cannot find trace!"); | |
763f41e5 DS |
606 | retval = -1; |
607 | goto end; | |
608 | } | |
609 | ||
610 | for(i = 0; i < trace->nr_channels; i++) { | |
611 | struct ust_channel *channel = &trace->channels[i]; | |
612 | ||
613 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
614 | ||
615 | channel->subbuf_cnt = num; | |
616 | DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt); | |
617 | ||
618 | found = 1; | |
619 | break; | |
620 | } | |
621 | } | |
622 | if(found == 0) { | |
623 | ERR("unable to find channel"); | |
624 | } | |
625 | ||
763f41e5 | 626 | end: |
86dd0ebc | 627 | ltt_unlock_traces(); |
763f41e5 DS |
628 | return retval; |
629 | } | |
630 | ||
204141ee PMF |
631 | static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src) |
632 | { | |
633 | int retval = 0; | |
b73a4c47 | 634 | struct ust_trace *trace; |
204141ee PMF |
635 | char trace_name[] = "auto"; |
636 | int i; | |
637 | char *channel_and_cpu; | |
638 | int found = 0; | |
639 | char *ch_name; | |
640 | int ch_cpu; | |
641 | ||
642 | DBG("get_subbuf"); | |
643 | ||
644 | channel_and_cpu = nth_token(recvbuf, 1); | |
645 | if(channel_and_cpu == NULL) { | |
27e84572 | 646 | ERR("cannot parse channel"); |
204141ee PMF |
647 | goto end; |
648 | } | |
649 | ||
650 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
651 | if(ch_cpu == -1) { | |
27e84572 | 652 | ERR("problem parsing channel name"); |
204141ee PMF |
653 | goto free_short_chan_name; |
654 | } | |
655 | ||
656 | ltt_lock_traces(); | |
657 | trace = _ltt_trace_find(trace_name); | |
204141ee PMF |
658 | |
659 | if(trace == NULL) { | |
2ddb81a8 PMF |
660 | int result; |
661 | ||
662 | WARN("Cannot find trace. It was likely destroyed by the user."); | |
86dd0ebc | 663 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
2ddb81a8 PMF |
664 | if(result) { |
665 | ERR("ustcomm_send_reply failed"); | |
2ddb81a8 | 666 | retval = -1; |
86dd0ebc | 667 | goto unlock_traces; |
2ddb81a8 PMF |
668 | } |
669 | ||
86dd0ebc | 670 | goto unlock_traces; |
204141ee PMF |
671 | } |
672 | ||
673 | for(i=0; i<trace->nr_channels; i++) { | |
674 | struct ust_channel *channel = &trace->channels[i]; | |
675 | ||
676 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
677 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
678 | struct blocked_consumer *bc; | |
679 | ||
680 | found = 1; | |
681 | ||
682 | bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); | |
683 | if(bc == NULL) { | |
684 | ERR("malloc returned NULL"); | |
86dd0ebc | 685 | goto unlock_traces; |
204141ee PMF |
686 | } |
687 | bc->fd_consumer = src->fd; | |
688 | bc->fd_producer = buf->data_ready_fd_read; | |
689 | bc->buf = buf; | |
690 | bc->src = *src; | |
691 | bc->server = ustcomm_app.server; | |
692 | ||
693 | list_add(&bc->list, &blocked_consumers); | |
694 | ||
d5adede0 PMF |
695 | /* Being here is the proof the daemon has mapped the buffer in its |
696 | * memory. We may now decrement buffers_to_export. | |
697 | */ | |
698 | if(atomic_long_read(&buf->consumed) == 0) { | |
699 | DBG("decrementing buffers_to_export"); | |
700 | buffers_to_export--; | |
701 | } | |
702 | ||
204141ee PMF |
703 | break; |
704 | } | |
705 | } | |
706 | if(found == 0) { | |
27e84572 | 707 | ERR("unable to find channel"); |
204141ee PMF |
708 | } |
709 | ||
86dd0ebc PMF |
710 | unlock_traces: |
711 | ltt_unlock_traces(); | |
712 | ||
204141ee PMF |
713 | free_short_chan_name: |
714 | free(ch_name); | |
715 | ||
716 | end: | |
717 | return retval; | |
718 | } | |
719 | ||
720 | static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src) | |
721 | { | |
722 | int retval = 0; | |
b73a4c47 | 723 | struct ust_trace *trace; |
204141ee PMF |
724 | char trace_name[] = "auto"; |
725 | int i; | |
726 | char *channel_and_cpu; | |
727 | int found = 0; | |
728 | int result; | |
729 | char *ch_name; | |
730 | int ch_cpu; | |
731 | long consumed_old; | |
732 | char *consumed_old_str; | |
733 | char *endptr; | |
2ddb81a8 | 734 | char *reply = NULL; |
204141ee PMF |
735 | |
736 | DBG("put_subbuf"); | |
737 | ||
738 | channel_and_cpu = strdup_malloc(nth_token(recvbuf, 1)); | |
739 | if(channel_and_cpu == NULL) { | |
27e84572 | 740 | ERR("cannot parse channel"); |
204141ee PMF |
741 | retval = -1; |
742 | goto end; | |
743 | } | |
744 | ||
745 | consumed_old_str = strdup_malloc(nth_token(recvbuf, 2)); | |
746 | if(consumed_old_str == NULL) { | |
27e84572 | 747 | ERR("cannot parse consumed_old"); |
204141ee PMF |
748 | retval = -1; |
749 | goto free_channel_and_cpu; | |
750 | } | |
751 | consumed_old = strtol(consumed_old_str, &endptr, 10); | |
752 | if(*endptr != '\0') { | |
27e84572 | 753 | ERR("invalid value for consumed_old"); |
204141ee PMF |
754 | retval = -1; |
755 | goto free_consumed_old_str; | |
756 | } | |
757 | ||
758 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
759 | if(ch_cpu == -1) { | |
27e84572 | 760 | ERR("problem parsing channel name"); |
204141ee PMF |
761 | retval = -1; |
762 | goto free_short_chan_name; | |
763 | } | |
764 | ||
765 | ltt_lock_traces(); | |
766 | trace = _ltt_trace_find(trace_name); | |
204141ee PMF |
767 | |
768 | if(trace == NULL) { | |
2ddb81a8 | 769 | WARN("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 770 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
2ddb81a8 PMF |
771 | if(result) { |
772 | ERR("ustcomm_send_reply failed"); | |
2ddb81a8 | 773 | retval = -1; |
86dd0ebc | 774 | goto unlock_traces; |
2ddb81a8 PMF |
775 | } |
776 | ||
86dd0ebc | 777 | goto unlock_traces; |
204141ee PMF |
778 | } |
779 | ||
780 | for(i=0; i<trace->nr_channels; i++) { | |
781 | struct ust_channel *channel = &trace->channels[i]; | |
782 | ||
783 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
784 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
204141ee PMF |
785 | |
786 | found = 1; | |
787 | ||
b73a4c47 | 788 | result = ust_buffers_put_subbuf(buf, consumed_old); |
204141ee | 789 | if(result < 0) { |
b73a4c47 | 790 | WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu); |
204141ee PMF |
791 | asprintf(&reply, "%s", "ERROR"); |
792 | } | |
793 | else { | |
b73a4c47 | 794 | DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu); |
204141ee PMF |
795 | asprintf(&reply, "%s", "OK"); |
796 | } | |
797 | ||
798 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
799 | if(result) { | |
27e84572 | 800 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
801 | free(reply); |
802 | retval = -1; | |
86dd0ebc | 803 | goto unlock_traces; |
204141ee PMF |
804 | } |
805 | ||
806 | free(reply); | |
807 | break; | |
808 | } | |
809 | } | |
810 | if(found == 0) { | |
2ddb81a8 | 811 | ERR("unable to find channel"); |
204141ee PMF |
812 | } |
813 | ||
86dd0ebc PMF |
814 | unlock_traces: |
815 | ltt_unlock_traces(); | |
204141ee PMF |
816 | free_short_chan_name: |
817 | free(ch_name); | |
2ddb81a8 PMF |
818 | free_consumed_old_str: |
819 | free(consumed_old_str); | |
820 | free_channel_and_cpu: | |
821 | free(channel_and_cpu); | |
204141ee PMF |
822 | |
823 | end: | |
824 | return retval; | |
825 | } | |
826 | ||
872037bb | 827 | void *listener_main(void *p) |
98963de4 PMF |
828 | { |
829 | int result; | |
830 | ||
26cc7017 PMF |
831 | ust_register_thread(); |
832 | ||
b0540e11 PMF |
833 | DBG("LISTENER"); |
834 | ||
98963de4 | 835 | for(;;) { |
aafb1650 PMF |
836 | char trace_name[] = "auto"; |
837 | char trace_type[] = "ustrelay"; | |
d0b5f2b9 PMF |
838 | char *recvbuf; |
839 | int len; | |
b02e31e5 | 840 | struct ustcomm_source src; |
98963de4 | 841 | |
3a7b90de PMF |
842 | process_blocked_consumers(); |
843 | ||
844 | result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5); | |
845 | if(result < 0) { | |
d0b5f2b9 PMF |
846 | WARN("error in ustcomm_app_recv_message"); |
847 | continue; | |
848 | } | |
3a7b90de PMF |
849 | else if(result == 0) { |
850 | /* no message */ | |
851 | continue; | |
852 | } | |
98963de4 | 853 | |
08230db7 | 854 | DBG("received a message! it's: %s", recvbuf); |
d0b5f2b9 | 855 | len = strlen(recvbuf); |
98963de4 | 856 | |
d0b5f2b9 | 857 | if(!strcmp(recvbuf, "print_markers")) { |
52c51a47 PMF |
858 | print_markers(stderr); |
859 | } | |
860 | else if(!strcmp(recvbuf, "list_markers")) { | |
861 | char *ptr; | |
862 | size_t size; | |
863 | FILE *fp; | |
864 | ||
865 | fp = open_memstream(&ptr, &size); | |
866 | print_markers(fp); | |
867 | fclose(fp); | |
868 | ||
869 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src); | |
870 | ||
871 | free(ptr); | |
872 | } | |
873 | else if(!strcmp(recvbuf, "start")) { | |
874 | /* start is an operation that setups the trace, allocates it and starts it */ | |
875 | result = ltt_trace_setup(trace_name); | |
876 | if(result < 0) { | |
877 | ERR("ltt_trace_setup failed"); | |
872037bb | 878 | return (void *)1; |
52c51a47 PMF |
879 | } |
880 | ||
881 | result = ltt_trace_set_type(trace_name, trace_type); | |
882 | if(result < 0) { | |
883 | ERR("ltt_trace_set_type failed"); | |
872037bb | 884 | return (void *)1; |
52c51a47 PMF |
885 | } |
886 | ||
887 | result = ltt_trace_alloc(trace_name); | |
888 | if(result < 0) { | |
889 | ERR("ltt_trace_alloc failed"); | |
872037bb | 890 | return (void *)1; |
52c51a47 PMF |
891 | } |
892 | ||
ad45e833 | 893 | inform_consumer_daemon(trace_name); |
52c51a47 PMF |
894 | |
895 | result = ltt_trace_start(trace_name); | |
896 | if(result < 0) { | |
897 | ERR("ltt_trace_start failed"); | |
898 | continue; | |
899 | } | |
d0b5f2b9 PMF |
900 | } |
901 | else if(!strcmp(recvbuf, "trace_setup")) { | |
902 | DBG("trace setup"); | |
fbd8191b | 903 | |
d0b5f2b9 PMF |
904 | result = ltt_trace_setup(trace_name); |
905 | if(result < 0) { | |
906 | ERR("ltt_trace_setup failed"); | |
872037bb | 907 | return (void *)1; |
fbd8191b | 908 | } |
d0b5f2b9 PMF |
909 | |
910 | result = ltt_trace_set_type(trace_name, trace_type); | |
911 | if(result < 0) { | |
912 | ERR("ltt_trace_set_type failed"); | |
872037bb | 913 | return (void *)1; |
fbd8191b | 914 | } |
d0b5f2b9 PMF |
915 | } |
916 | else if(!strcmp(recvbuf, "trace_alloc")) { | |
917 | DBG("trace alloc"); | |
918 | ||
919 | result = ltt_trace_alloc(trace_name); | |
920 | if(result < 0) { | |
921 | ERR("ltt_trace_alloc failed"); | |
872037bb | 922 | return (void *)1; |
fbd8191b | 923 | } |
763f41e5 | 924 | inform_consumer_daemon(trace_name); |
d0b5f2b9 | 925 | } |
62ec620f PMF |
926 | else if(!strcmp(recvbuf, "trace_create")) { |
927 | DBG("trace create"); | |
928 | ||
929 | result = ltt_trace_setup(trace_name); | |
930 | if(result < 0) { | |
931 | ERR("ltt_trace_setup failed"); | |
932 | return (void *)1; | |
933 | } | |
934 | ||
935 | result = ltt_trace_set_type(trace_name, trace_type); | |
936 | if(result < 0) { | |
937 | ERR("ltt_trace_set_type failed"); | |
938 | return (void *)1; | |
939 | } | |
763f41e5 DS |
940 | } |
941 | else if(!strcmp(recvbuf, "trace_start")) { | |
942 | DBG("trace start"); | |
62ec620f PMF |
943 | |
944 | result = ltt_trace_alloc(trace_name); | |
945 | if(result < 0) { | |
946 | ERR("ltt_trace_alloc failed"); | |
947 | return (void *)1; | |
948 | } | |
763f41e5 DS |
949 | if(!result) { |
950 | inform_consumer_daemon(trace_name); | |
951 | } | |
d0b5f2b9 PMF |
952 | |
953 | result = ltt_trace_start(trace_name); | |
954 | if(result < 0) { | |
955 | ERR("ltt_trace_start failed"); | |
956 | continue; | |
fbd8191b | 957 | } |
d0b5f2b9 PMF |
958 | } |
959 | else if(!strcmp(recvbuf, "trace_stop")) { | |
960 | DBG("trace stop"); | |
961 | ||
962 | result = ltt_trace_stop(trace_name); | |
963 | if(result < 0) { | |
964 | ERR("ltt_trace_stop failed"); | |
872037bb | 965 | return (void *)1; |
aafb1650 | 966 | } |
d0b5f2b9 PMF |
967 | } |
968 | else if(!strcmp(recvbuf, "trace_destroy")) { | |
aafb1650 | 969 | |
d0b5f2b9 | 970 | DBG("trace destroy"); |
aafb1650 | 971 | |
31d392f1 | 972 | result = ltt_trace_destroy(trace_name, 0); |
d0b5f2b9 PMF |
973 | if(result < 0) { |
974 | ERR("ltt_trace_destroy failed"); | |
872037bb | 975 | return (void *)1; |
fbd8191b | 976 | } |
98963de4 | 977 | } |
b02e31e5 | 978 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
204141ee | 979 | do_cmd_get_shmid(recvbuf, &src); |
811e4b93 PMF |
980 | } |
981 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { | |
204141ee | 982 | do_cmd_get_n_subbufs(recvbuf, &src); |
811e4b93 PMF |
983 | } |
984 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { | |
204141ee | 985 | do_cmd_get_subbuf_size(recvbuf, &src); |
3847c3ba | 986 | } |
b02e31e5 PMF |
987 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
988 | char *libfile; | |
989 | ||
990 | libfile = nth_token(recvbuf, 1); | |
991 | ||
992 | DBG("load_probe_lib loading %s", libfile); | |
204141ee PMF |
993 | |
994 | free(libfile); | |
b02e31e5 | 995 | } |
688760ef | 996 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
204141ee | 997 | do_cmd_get_subbuffer(recvbuf, &src); |
688760ef PMF |
998 | } |
999 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { | |
204141ee | 1000 | do_cmd_put_subbuffer(recvbuf, &src); |
688760ef | 1001 | } |
763f41e5 DS |
1002 | else if(nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) { |
1003 | do_cmd_set_subbuf_size(recvbuf, &src); | |
1004 | } | |
1005 | else if(nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) { | |
1006 | do_cmd_set_subbuf_num(recvbuf, &src); | |
1007 | } | |
52c51a47 PMF |
1008 | else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { |
1009 | char *channel_slash_name = nth_token(recvbuf, 1); | |
1010 | char channel_name[256]=""; | |
1011 | char marker_name[256]=""; | |
52c51a47 PMF |
1012 | |
1013 | result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); | |
1014 | ||
1015 | if(channel_name == NULL || marker_name == NULL) { | |
1016 | WARN("invalid marker name"); | |
1017 | goto next_cmd; | |
1018 | } | |
52c51a47 PMF |
1019 | |
1020 | result = ltt_marker_connect(channel_name, marker_name, "default"); | |
1021 | if(result < 0) { | |
1022 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); | |
1023 | } | |
1024 | } | |
1025 | else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { | |
1026 | char *channel_slash_name = nth_token(recvbuf, 1); | |
1027 | char *marker_name; | |
1028 | char *channel_name; | |
52c51a47 PMF |
1029 | |
1030 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); | |
1031 | ||
1032 | if(marker_name == NULL) { | |
1033 | } | |
52c51a47 PMF |
1034 | |
1035 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); | |
1036 | if(result < 0) { | |
1037 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); | |
1038 | } | |
1039 | } | |
ed1317e7 PMF |
1040 | else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) { |
1041 | char *reply; | |
1042 | ||
1043 | asprintf(&reply, "%lld", pidunique); | |
1044 | ||
1045 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
1046 | if(result) { | |
1047 | ERR("listener: get_pidunique: ustcomm_send_reply failed"); | |
1048 | goto next_cmd; | |
1049 | } | |
1050 | ||
1051 | free(reply); | |
1052 | } | |
3a7b90de | 1053 | // else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { |
b73a4c47 | 1054 | // struct ust_trace *trace; |
3a7b90de PMF |
1055 | // char trace_name[] = "auto"; |
1056 | // int i; | |
1057 | // char *channel_name; | |
1058 | // | |
1059 | // DBG("get_notifications"); | |
1060 | // | |
1061 | // channel_name = strdup_malloc(nth_token(recvbuf, 1)); | |
1062 | // if(channel_name == NULL) { | |
1063 | // ERR("put_subbuf_size: cannot parse channel"); | |
1064 | // goto next_cmd; | |
1065 | // } | |
1066 | // | |
1067 | // ltt_lock_traces(); | |
1068 | // trace = _ltt_trace_find(trace_name); | |
1069 | // ltt_unlock_traces(); | |
1070 | // | |
1071 | // if(trace == NULL) { | |
63fe14e5 | 1072 | // ERR("cannot find trace!"); |
872037bb | 1073 | // return (void *)1; |
3a7b90de PMF |
1074 | // } |
1075 | // | |
1076 | // for(i=0; i<trace->nr_channels; i++) { | |
1077 | // struct rchan *rchan = trace->channels[i].trans_channel_data; | |
1078 | // int fd; | |
1079 | // | |
1080 | // if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
1081 | // struct rchan_buf *rbuf = rchan->buf; | |
1082 | // struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; | |
1083 | // | |
1084 | // result = fd = ustcomm_app_detach_client(&ustcomm_app, &src); | |
1085 | // if(result == -1) { | |
1086 | // ERR("ustcomm_app_detach_client failed"); | |
1087 | // goto next_cmd; | |
1088 | // } | |
1089 | // | |
1090 | // lttbuf->wake_consumer_arg = (void *) fd; | |
1091 | // | |
1092 | // smp_wmb(); | |
1093 | // | |
1094 | // lttbuf->call_wake_consumer = 1; | |
1095 | // | |
1096 | // break; | |
1097 | // } | |
1098 | // } | |
1099 | // | |
1100 | // free(channel_name); | |
1101 | // } | |
688760ef PMF |
1102 | else { |
1103 | ERR("unable to parse message: %s", recvbuf); | |
1104 | } | |
d0b5f2b9 | 1105 | |
811e4b93 | 1106 | next_cmd: |
d0b5f2b9 | 1107 | free(recvbuf); |
98963de4 PMF |
1108 | } |
1109 | } | |
1110 | ||
7958de40 | 1111 | volatile sig_atomic_t have_listener = 0; |
4440ebcb | 1112 | |
98963de4 PMF |
1113 | void create_listener(void) |
1114 | { | |
9160b4e4 | 1115 | #ifdef USE_CLONE |
98963de4 | 1116 | static char listener_stack[16384]; |
c5fdc888 | 1117 | int result; |
4440ebcb PMF |
1118 | #else |
1119 | pthread_t thread; | |
9160b4e4 | 1120 | #endif |
98963de4 | 1121 | |
c5fdc888 PMF |
1122 | if(have_listener) { |
1123 | WARN("not creating listener because we already had one"); | |
4440ebcb | 1124 | return; |
c5fdc888 | 1125 | } |
4440ebcb | 1126 | |
3847c3ba | 1127 | #ifdef USE_CLONE |
c5fdc888 | 1128 | result = clone((int (*)(void *)) listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
98963de4 PMF |
1129 | if(result == -1) { |
1130 | perror("clone"); | |
4440ebcb | 1131 | return; |
98963de4 | 1132 | } |
3847c3ba | 1133 | #else |
b0540e11 | 1134 | |
3847c3ba PMF |
1135 | pthread_create(&thread, NULL, listener_main, NULL); |
1136 | #endif | |
4440ebcb PMF |
1137 | |
1138 | have_listener = 1; | |
98963de4 PMF |
1139 | } |
1140 | ||
98963de4 | 1141 | static int init_socket(void) |
68c1021b | 1142 | { |
d0b5f2b9 | 1143 | return ustcomm_init_app(getpid(), &ustcomm_app); |
68c1021b PMF |
1144 | } |
1145 | ||
5de74e51 PMF |
1146 | #define AUTOPROBE_DISABLED 0 |
1147 | #define AUTOPROBE_ENABLE_ALL 1 | |
1148 | #define AUTOPROBE_ENABLE_REGEX 2 | |
1149 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
1150 | static regex_t autoprobe_regex; | |
ef290fca | 1151 | |
20b37a31 | 1152 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
1153 | { |
1154 | int result; | |
1155 | ||
5de74e51 PMF |
1156 | char* concat_name = NULL; |
1157 | const char *probe_name = "default"; | |
ef290fca | 1158 | |
5de74e51 | 1159 | if(autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca PMF |
1160 | return; |
1161 | } | |
5de74e51 PMF |
1162 | else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
1163 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); | |
1164 | if(result == -1) { | |
1165 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", | |
1166 | m->channel, m->name); | |
1167 | return; | |
1168 | } | |
1169 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
1170 | free(concat_name); | |
1171 | return; | |
1172 | } | |
1173 | free(concat_name); | |
ef290fca PMF |
1174 | } |
1175 | ||
5de74e51 | 1176 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
acbf228b PMF |
1177 | if(result && result != -EEXIST) |
1178 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); | |
20b37a31 | 1179 | |
3ea1e2fc | 1180 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
ef290fca | 1181 | |
20b37a31 PMF |
1182 | } |
1183 | ||
c1083aa8 | 1184 | static void __attribute__((constructor)) init() |
20b37a31 PMF |
1185 | { |
1186 | int result; | |
5de74e51 | 1187 | char* autoprobe_val = NULL; |
20b37a31 | 1188 | |
ed1317e7 PMF |
1189 | /* Assign the pidunique, to be able to differentiate the processes with same |
1190 | * pid, (before and after an exec). | |
1191 | */ | |
1192 | pidunique = make_pidunique(); | |
1193 | ||
4440ebcb | 1194 | /* Initialize RCU in case the constructor order is not good. */ |
5a66a1f2 | 1195 | rcu_init(); |
4440ebcb PMF |
1196 | |
1197 | /* It is important to do this before events start to be generated. */ | |
1198 | ust_register_thread(); | |
1199 | ||
5de74e51 | 1200 | DBG("Tracectl constructor"); |
20b37a31 | 1201 | |
3847c3ba PMF |
1202 | /* Must create socket before signal handler to prevent races. |
1203 | */ | |
1204 | result = init_socket(); | |
1205 | if(result == -1) { | |
1206 | ERR("init_socket error"); | |
1207 | return; | |
1208 | } | |
2944a629 PMF |
1209 | |
1210 | create_listener(); | |
68c1021b | 1211 | |
5de74e51 PMF |
1212 | autoprobe_val = getenv("UST_AUTOPROBE"); |
1213 | if(autoprobe_val) { | |
4440ebcb PMF |
1214 | struct marker_iter iter; |
1215 | ||
08230db7 | 1216 | DBG("Autoprobe enabled."); |
4440ebcb PMF |
1217 | |
1218 | /* Ensure markers are initialized */ | |
1219 | //init_markers(); | |
1220 | ||
1221 | /* Ensure marker control is initialized, for the probe */ | |
1222 | init_marker_control(); | |
1223 | ||
1224 | /* first, set the callback that will connect the | |
1225 | * probe on new markers | |
1226 | */ | |
5de74e51 PMF |
1227 | if(autoprobe_val[0] == '/') { |
1228 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); | |
1229 | if (result) { | |
1230 | char regexerr[150]; | |
1231 | ||
1232 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
1233 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
1234 | /* don't crash the application just for this */ | |
1235 | } | |
1236 | else { | |
1237 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; | |
1238 | } | |
ef290fca | 1239 | } |
5de74e51 PMF |
1240 | else { |
1241 | /* just enable all instrumentation */ | |
1242 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
1243 | } | |
1244 | ||
1245 | marker_set_new_marker_cb(auto_probe_connect); | |
1246 | ||
4440ebcb PMF |
1247 | /* Now, connect the probes that were already registered. */ |
1248 | marker_iter_reset(&iter); | |
1249 | marker_iter_start(&iter); | |
1250 | ||
08230db7 | 1251 | DBG("now iterating on markers already registered"); |
4440ebcb | 1252 | while(iter.marker) { |
08230db7 | 1253 | DBG("now iterating on marker %s", iter.marker->name); |
4440ebcb PMF |
1254 | auto_probe_connect(iter.marker); |
1255 | marker_iter_next(&iter); | |
1256 | } | |
1257 | } | |
1258 | ||
4db647c5 PMF |
1259 | if(getenv("UST_TRACE")) { |
1260 | char trace_name[] = "auto"; | |
1261 | char trace_type[] = "ustrelay"; | |
1262 | ||
1263 | DBG("starting early tracing"); | |
1264 | ||
1265 | /* Ensure marker control is initialized */ | |
1266 | init_marker_control(); | |
1267 | ||
4db647c5 PMF |
1268 | /* Ensure markers are initialized */ |
1269 | init_markers(); | |
1270 | ||
e17571a5 PMF |
1271 | /* Ensure buffers are initialized, for the transport to be available. |
1272 | * We are about to set a trace type and it will fail without this. | |
1273 | */ | |
1274 | init_ustrelay_transport(); | |
1275 | ||
027ffc9d PMF |
1276 | /* FIXME: When starting early tracing (here), depending on the |
1277 | * order of constructors, it is very well possible some marker | |
1278 | * sections are not yet registered. Because of this, some | |
1279 | * channels may not be registered. Yet, we are about to ask the | |
1280 | * daemon to collect the channels. Channels which are not yet | |
1281 | * registered will not be collected. | |
1282 | * | |
1283 | * Currently, in LTTng, there is no way to add a channel after | |
1284 | * trace start. The reason for this is that it induces complex | |
1285 | * concurrency issues on the trace structures, which can only | |
1286 | * be resolved using RCU. This has not been done yet. As a | |
1287 | * workaround, we are forcing the registration of the "ust" | |
1288 | * channel here. This is the only channel (apart from metadata) | |
1289 | * that can be reliably used in early tracing. | |
1290 | * | |
1291 | * Non-early tracing does not have this problem and can use | |
1292 | * arbitrary channel names. | |
1293 | */ | |
20b37a31 | 1294 | ltt_channels_register("ust"); |
4db647c5 PMF |
1295 | |
1296 | result = ltt_trace_setup(trace_name); | |
1297 | if(result < 0) { | |
1298 | ERR("ltt_trace_setup failed"); | |
1299 | return; | |
1300 | } | |
1301 | ||
1302 | result = ltt_trace_set_type(trace_name, trace_type); | |
1303 | if(result < 0) { | |
1304 | ERR("ltt_trace_set_type failed"); | |
1305 | return; | |
1306 | } | |
1307 | ||
1308 | result = ltt_trace_alloc(trace_name); | |
1309 | if(result < 0) { | |
1310 | ERR("ltt_trace_alloc failed"); | |
1311 | return; | |
1312 | } | |
1313 | ||
1314 | result = ltt_trace_start(trace_name); | |
1315 | if(result < 0) { | |
1316 | ERR("ltt_trace_start failed"); | |
1317 | return; | |
1318 | } | |
60e57148 PMF |
1319 | |
1320 | /* Do this after the trace is started in order to avoid creating confusion | |
1321 | * if the trace fails to start. */ | |
1322 | inform_consumer_daemon(trace_name); | |
4db647c5 PMF |
1323 | } |
1324 | ||
68c1021b PMF |
1325 | |
1326 | return; | |
1327 | ||
1328 | /* should decrementally destroy stuff if error */ | |
1329 | ||
1330 | } | |
1331 | ||
1332 | /* This is only called if we terminate normally, not with an unhandled signal, | |
6d45c11a PMF |
1333 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
1334 | * the last sub-buffer contain a valid end time for the trace. This is done | |
1335 | * automatically only when the trace is properly stopped. | |
1336 | * | |
1337 | * If the traced program crashed, it is always possible to manually add the | |
1338 | * right value in the header, or to open the trace in text mode. | |
1339 | * | |
1340 | * FIXME: Fix LTTV so it doesn't need this. | |
1341 | */ | |
68c1021b | 1342 | |
6d45c11a | 1343 | static void destroy_traces(void) |
68c1021b | 1344 | { |
6d45c11a | 1345 | int result; |
a584bc4e PMF |
1346 | |
1347 | /* if trace running, finish it */ | |
1348 | ||
6d45c11a | 1349 | DBG("destructor stopping traces"); |
a584bc4e | 1350 | |
6d45c11a PMF |
1351 | result = ltt_trace_stop("auto"); |
1352 | if(result == -1) { | |
1353 | ERR("ltt_trace_stop error"); | |
1354 | } | |
1355 | ||
31d392f1 | 1356 | result = ltt_trace_destroy("auto", 0); |
6d45c11a PMF |
1357 | if(result == -1) { |
1358 | ERR("ltt_trace_destroy error"); | |
1359 | } | |
68c1021b | 1360 | } |
1e2944cb | 1361 | |
97d9b88b PMF |
1362 | static int trace_recording(void) |
1363 | { | |
1364 | int retval = 0; | |
b73a4c47 | 1365 | struct ust_trace *trace; |
97d9b88b PMF |
1366 | |
1367 | ltt_lock_traces(); | |
1368 | ||
1369 | list_for_each_entry(trace, <t_traces.head, list) { | |
1370 | if(trace->active) { | |
1371 | retval = 1; | |
1372 | break; | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | ltt_unlock_traces(); | |
1377 | ||
1378 | return retval; | |
1379 | } | |
1380 | ||
f293009f | 1381 | #if 0 |
97d9b88b PMF |
1382 | static int have_consumer(void) |
1383 | { | |
1384 | return !list_empty(&blocked_consumers); | |
1385 | } | |
f293009f | 1386 | #endif |
97d9b88b | 1387 | |
f293009f | 1388 | int restarting_usleep(useconds_t usecs) |
97d9b88b PMF |
1389 | { |
1390 | struct timespec tv; | |
1391 | int result; | |
1392 | ||
f293009f PMF |
1393 | tv.tv_sec = 0; |
1394 | tv.tv_nsec = usecs * 1000; | |
97d9b88b PMF |
1395 | |
1396 | do { | |
1397 | result = nanosleep(&tv, &tv); | |
1398 | } while(result == -1 && errno == EINTR); | |
1399 | ||
1400 | return result; | |
1401 | } | |
1402 | ||
f293009f PMF |
1403 | /* This destructor keeps the process alive for a few seconds in order |
1404 | * to leave time to ustd to connect to its buffers. This is necessary | |
1405 | * for programs whose execution is very short. It is also useful in all | |
1406 | * programs when tracing is started close to the end of the program | |
1407 | * execution. | |
1408 | * | |
1409 | * FIXME: For now, this only works for the first trace created in a | |
1410 | * process. | |
1411 | */ | |
1412 | ||
97d9b88b PMF |
1413 | static void __attribute__((destructor)) keepalive() |
1414 | { | |
f293009f | 1415 | if(trace_recording() && buffers_to_export) { |
c472cce0 | 1416 | int total = 0; |
f293009f PMF |
1417 | DBG("Keeping process alive for consumer daemon..."); |
1418 | while(buffers_to_export) { | |
1419 | const int interv = 200000; | |
c472cce0 | 1420 | restarting_usleep(interv); |
f293009f PMF |
1421 | total += interv; |
1422 | ||
1423 | if(total >= 3000000) { | |
c472cce0 | 1424 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
f293009f PMF |
1425 | break; |
1426 | } | |
1427 | } | |
1428 | DBG("Finally dying..."); | |
1429 | } | |
6d45c11a PMF |
1430 | |
1431 | destroy_traces(); | |
1432 | ||
1433 | ustcomm_fini_app(&ustcomm_app); | |
97d9b88b | 1434 | } |
97d9b88b | 1435 | |
775c8a3f | 1436 | void ust_potential_exec(void) |
c396a841 PMF |
1437 | { |
1438 | trace_mark(ust, potential_exec, MARK_NOARGS); | |
1439 | ||
775c8a3f PMF |
1440 | DBG("test"); |
1441 | ||
c396a841 PMF |
1442 | keepalive(); |
1443 | } | |
1444 | ||
1e2944cb PMF |
1445 | /* Notify ust that there was a fork. This needs to be called inside |
1446 | * the new process, anytime a process whose memory is not shared with | |
1447 | * the parent is created. If this function is not called, the events | |
1448 | * of the new process will not be collected. | |
616ed36a PMF |
1449 | * |
1450 | * Signals should be disabled before the fork and reenabled only after | |
1451 | * this call in order to guarantee tracing is not started before ust_fork() | |
1452 | * sanitizes the new process. | |
1e2944cb PMF |
1453 | */ |
1454 | ||
616ed36a | 1455 | static void ust_fork(void) |
1e2944cb | 1456 | { |
99b72dc0 PMF |
1457 | struct blocked_consumer *bc; |
1458 | struct blocked_consumer *deletable_bc = NULL; | |
1459 | int result; | |
1460 | ||
31d392f1 | 1461 | /* FIXME: technically, the locks could have been taken before the fork */ |
1e2944cb | 1462 | DBG("ust: forking"); |
73850001 PMF |
1463 | |
1464 | /* break lock if necessary */ | |
1465 | ltt_unlock_traces(); | |
1466 | ||
1e2944cb | 1467 | ltt_trace_stop("auto"); |
31d392f1 | 1468 | ltt_trace_destroy("auto", 1); |
99b72dc0 PMF |
1469 | /* Delete all active connections */ |
1470 | ustcomm_close_all_connections(&ustcomm_app.server); | |
1471 | ||
1472 | /* Delete all blocked consumers */ | |
1473 | list_for_each_entry(bc, &blocked_consumers, list) { | |
d9ce395d PMF |
1474 | close(bc->fd_producer); |
1475 | close(bc->fd_consumer); | |
99b72dc0 PMF |
1476 | free(deletable_bc); |
1477 | deletable_bc = bc; | |
1478 | list_del(&bc->list); | |
1479 | } | |
1480 | ||
393bc391 PMF |
1481 | ustcomm_free_app(&ustcomm_app); |
1482 | ||
cedc0155 | 1483 | buffers_to_export = 0; |
1e2944cb | 1484 | have_listener = 0; |
99b72dc0 | 1485 | init_socket(); |
9fb49d0e | 1486 | create_listener(); |
99b72dc0 PMF |
1487 | ltt_trace_setup("auto"); |
1488 | result = ltt_trace_set_type("auto", "ustrelay"); | |
1489 | if(result < 0) { | |
1490 | ERR("ltt_trace_set_type failed"); | |
036db133 | 1491 | return; |
99b72dc0 PMF |
1492 | } |
1493 | ||
1494 | ltt_trace_alloc("auto"); | |
1495 | ltt_trace_start("auto"); | |
ad45e833 | 1496 | inform_consumer_daemon("auto"); |
1e2944cb PMF |
1497 | } |
1498 | ||
616ed36a PMF |
1499 | void ust_before_fork(ust_fork_info_t *fork_info) |
1500 | { | |
1501 | /* Disable signals. This is to avoid that the child | |
1502 | * intervenes before it is properly setup for tracing. It is | |
1503 | * safer to disable all signals, because then we know we are not | |
1504 | * breaking anything by restoring the original mask. | |
1505 | */ | |
1506 | sigset_t all_sigs; | |
1507 | int result; | |
1508 | ||
1509 | /* FIXME: | |
1510 | - only do this if tracing is active | |
1511 | */ | |
1512 | ||
1513 | /* Disable signals */ | |
1514 | sigfillset(&all_sigs); | |
1515 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); | |
1516 | if(result == -1) { | |
1517 | PERROR("sigprocmask"); | |
1518 | return; | |
1519 | } | |
1520 | } | |
1521 | ||
1522 | /* Don't call this function directly in a traced program */ | |
1523 | static void ust_after_fork_common(ust_fork_info_t *fork_info) | |
1524 | { | |
1525 | int result; | |
616ed36a PMF |
1526 | |
1527 | /* Restore signals */ | |
1528 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); | |
1529 | if(result == -1) { | |
1530 | PERROR("sigprocmask"); | |
1531 | return; | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | void ust_after_fork_parent(ust_fork_info_t *fork_info) | |
1536 | { | |
1537 | /* Reenable signals */ | |
1538 | ust_after_fork_common(fork_info); | |
1539 | } | |
1540 | ||
1541 | void ust_after_fork_child(ust_fork_info_t *fork_info) | |
1542 | { | |
1543 | /* First sanitize the child */ | |
1544 | ust_fork(); | |
1545 | ||
1546 | /* Then reenable interrupts */ | |
1547 | ust_after_fork_common(fork_info); | |
1548 | } | |
1549 |