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 | ||
360 | if(found) { | |
361 | buffers_to_export--; | |
362 | } | |
363 | else { | |
27e84572 | 364 | ERR("channel not found (%s)", channel_and_cpu); |
204141ee PMF |
365 | } |
366 | ||
367 | free_short_chan_name: | |
368 | free(ch_name); | |
369 | ||
370 | end: | |
371 | return retval; | |
372 | } | |
373 | ||
374 | static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src) | |
375 | { | |
376 | int retval = 0; | |
b73a4c47 | 377 | struct ust_trace *trace; |
204141ee PMF |
378 | char trace_name[] = "auto"; |
379 | int i; | |
380 | char *channel_and_cpu; | |
381 | int found = 0; | |
382 | int result; | |
383 | char *ch_name; | |
384 | int ch_cpu; | |
385 | ||
386 | DBG("get_n_subbufs"); | |
387 | ||
388 | channel_and_cpu = nth_token(recvbuf, 1); | |
389 | if(channel_and_cpu == NULL) { | |
27e84572 | 390 | ERR("cannot parse channel"); |
204141ee PMF |
391 | goto end; |
392 | } | |
393 | ||
394 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
395 | if(ch_cpu == -1) { | |
27e84572 | 396 | ERR("problem parsing channel name"); |
204141ee PMF |
397 | goto free_short_chan_name; |
398 | } | |
399 | ||
400 | ltt_lock_traces(); | |
401 | trace = _ltt_trace_find(trace_name); | |
402 | ltt_unlock_traces(); | |
403 | ||
404 | if(trace == NULL) { | |
405 | ERR("cannot find trace!"); | |
406 | retval = -1; | |
407 | goto free_short_chan_name; | |
408 | } | |
409 | ||
410 | for(i=0; i<trace->nr_channels; i++) { | |
411 | struct ust_channel *channel = &trace->channels[i]; | |
412 | ||
413 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
414 | char *reply; | |
415 | ||
416 | DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt); | |
417 | asprintf(&reply, "%d", channel->subbuf_cnt); | |
418 | ||
419 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
420 | if(result) { | |
27e84572 | 421 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
422 | free(reply); |
423 | retval = -1; | |
424 | goto free_short_chan_name; | |
425 | } | |
426 | ||
427 | free(reply); | |
428 | found = 1; | |
429 | break; | |
430 | } | |
431 | } | |
432 | if(found == 0) { | |
27e84572 | 433 | ERR("unable to find channel"); |
204141ee PMF |
434 | } |
435 | ||
436 | free_short_chan_name: | |
437 | free(ch_name); | |
438 | ||
439 | end: | |
440 | return retval; | |
441 | } | |
442 | ||
443 | static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src) | |
444 | { | |
445 | int retval = 0; | |
b73a4c47 | 446 | struct ust_trace *trace; |
204141ee PMF |
447 | char trace_name[] = "auto"; |
448 | int i; | |
449 | char *channel_and_cpu; | |
450 | int found = 0; | |
451 | int result; | |
452 | char *ch_name; | |
453 | int ch_cpu; | |
454 | ||
455 | DBG("get_subbuf_size"); | |
456 | ||
457 | channel_and_cpu = nth_token(recvbuf, 1); | |
458 | if(channel_and_cpu == NULL) { | |
27e84572 | 459 | ERR("cannot parse channel"); |
204141ee PMF |
460 | goto end; |
461 | } | |
462 | ||
463 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
464 | if(ch_cpu == -1) { | |
27e84572 | 465 | ERR("problem parsing channel name"); |
204141ee PMF |
466 | goto free_short_chan_name; |
467 | } | |
468 | ||
469 | ltt_lock_traces(); | |
470 | trace = _ltt_trace_find(trace_name); | |
471 | ltt_unlock_traces(); | |
472 | ||
473 | if(trace == NULL) { | |
474 | ERR("cannot find trace!"); | |
475 | retval = -1; | |
476 | goto free_short_chan_name; | |
477 | } | |
478 | ||
479 | for(i=0; i<trace->nr_channels; i++) { | |
480 | struct ust_channel *channel = &trace->channels[i]; | |
481 | ||
482 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
483 | char *reply; | |
484 | ||
485 | DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size); | |
486 | asprintf(&reply, "%zd", channel->subbuf_size); | |
487 | ||
488 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
489 | if(result) { | |
27e84572 | 490 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
491 | free(reply); |
492 | retval = -1; | |
493 | goto free_short_chan_name; | |
494 | } | |
495 | ||
496 | free(reply); | |
497 | found = 1; | |
498 | break; | |
499 | } | |
500 | } | |
501 | if(found == 0) { | |
27e84572 | 502 | ERR("unable to find channel"); |
204141ee PMF |
503 | } |
504 | ||
505 | free_short_chan_name: | |
506 | free(ch_name); | |
507 | ||
508 | end: | |
509 | return retval; | |
510 | } | |
511 | ||
512 | static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src) | |
513 | { | |
514 | int retval = 0; | |
b73a4c47 | 515 | struct ust_trace *trace; |
204141ee PMF |
516 | char trace_name[] = "auto"; |
517 | int i; | |
518 | char *channel_and_cpu; | |
519 | int found = 0; | |
520 | char *ch_name; | |
521 | int ch_cpu; | |
522 | ||
523 | DBG("get_subbuf"); | |
524 | ||
525 | channel_and_cpu = nth_token(recvbuf, 1); | |
526 | if(channel_and_cpu == NULL) { | |
27e84572 | 527 | ERR("cannot parse channel"); |
204141ee PMF |
528 | goto end; |
529 | } | |
530 | ||
531 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
532 | if(ch_cpu == -1) { | |
27e84572 | 533 | ERR("problem parsing channel name"); |
204141ee PMF |
534 | goto free_short_chan_name; |
535 | } | |
536 | ||
537 | ltt_lock_traces(); | |
538 | trace = _ltt_trace_find(trace_name); | |
539 | ltt_unlock_traces(); | |
540 | ||
541 | if(trace == NULL) { | |
2ddb81a8 PMF |
542 | char *reply; |
543 | int result; | |
544 | ||
545 | WARN("Cannot find trace. It was likely destroyed by the user."); | |
546 | asprintf(&reply, "%s", "NOTFOUND"); | |
547 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
548 | if(result) { | |
549 | ERR("ustcomm_send_reply failed"); | |
550 | free(reply); | |
551 | retval = -1; | |
552 | goto free_short_chan_name; | |
553 | } | |
554 | ||
555 | free(reply); | |
204141ee PMF |
556 | goto free_short_chan_name; |
557 | } | |
558 | ||
559 | for(i=0; i<trace->nr_channels; i++) { | |
560 | struct ust_channel *channel = &trace->channels[i]; | |
561 | ||
562 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
563 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
564 | struct blocked_consumer *bc; | |
565 | ||
566 | found = 1; | |
567 | ||
568 | bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); | |
569 | if(bc == NULL) { | |
570 | ERR("malloc returned NULL"); | |
571 | goto free_short_chan_name; | |
572 | } | |
573 | bc->fd_consumer = src->fd; | |
574 | bc->fd_producer = buf->data_ready_fd_read; | |
575 | bc->buf = buf; | |
576 | bc->src = *src; | |
577 | bc->server = ustcomm_app.server; | |
578 | ||
579 | list_add(&bc->list, &blocked_consumers); | |
580 | ||
581 | break; | |
582 | } | |
583 | } | |
584 | if(found == 0) { | |
27e84572 | 585 | ERR("unable to find channel"); |
204141ee PMF |
586 | } |
587 | ||
588 | free_short_chan_name: | |
589 | free(ch_name); | |
590 | ||
591 | end: | |
592 | return retval; | |
593 | } | |
594 | ||
595 | static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src) | |
596 | { | |
597 | int retval = 0; | |
b73a4c47 | 598 | struct ust_trace *trace; |
204141ee PMF |
599 | char trace_name[] = "auto"; |
600 | int i; | |
601 | char *channel_and_cpu; | |
602 | int found = 0; | |
603 | int result; | |
604 | char *ch_name; | |
605 | int ch_cpu; | |
606 | long consumed_old; | |
607 | char *consumed_old_str; | |
608 | char *endptr; | |
2ddb81a8 | 609 | char *reply = NULL; |
204141ee PMF |
610 | |
611 | DBG("put_subbuf"); | |
612 | ||
613 | channel_and_cpu = strdup_malloc(nth_token(recvbuf, 1)); | |
614 | if(channel_and_cpu == NULL) { | |
27e84572 | 615 | ERR("cannot parse channel"); |
204141ee PMF |
616 | retval = -1; |
617 | goto end; | |
618 | } | |
619 | ||
620 | consumed_old_str = strdup_malloc(nth_token(recvbuf, 2)); | |
621 | if(consumed_old_str == NULL) { | |
27e84572 | 622 | ERR("cannot parse consumed_old"); |
204141ee PMF |
623 | retval = -1; |
624 | goto free_channel_and_cpu; | |
625 | } | |
626 | consumed_old = strtol(consumed_old_str, &endptr, 10); | |
627 | if(*endptr != '\0') { | |
27e84572 | 628 | ERR("invalid value for consumed_old"); |
204141ee PMF |
629 | retval = -1; |
630 | goto free_consumed_old_str; | |
631 | } | |
632 | ||
633 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
634 | if(ch_cpu == -1) { | |
27e84572 | 635 | ERR("problem parsing channel name"); |
204141ee PMF |
636 | retval = -1; |
637 | goto free_short_chan_name; | |
638 | } | |
639 | ||
640 | ltt_lock_traces(); | |
641 | trace = _ltt_trace_find(trace_name); | |
642 | ltt_unlock_traces(); | |
643 | ||
644 | if(trace == NULL) { | |
2ddb81a8 PMF |
645 | WARN("Cannot find trace. It was likely destroyed by the user."); |
646 | asprintf(&reply, "%s", "NOTFOUND"); | |
647 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
648 | if(result) { | |
649 | ERR("ustcomm_send_reply failed"); | |
650 | free(reply); | |
651 | retval = -1; | |
652 | goto free_short_chan_name; | |
653 | } | |
654 | ||
655 | free(reply); | |
204141ee PMF |
656 | goto free_short_chan_name; |
657 | } | |
658 | ||
659 | for(i=0; i<trace->nr_channels; i++) { | |
660 | struct ust_channel *channel = &trace->channels[i]; | |
661 | ||
662 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
663 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
204141ee PMF |
664 | |
665 | found = 1; | |
666 | ||
b73a4c47 | 667 | result = ust_buffers_put_subbuf(buf, consumed_old); |
204141ee | 668 | if(result < 0) { |
b73a4c47 | 669 | WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu); |
204141ee PMF |
670 | asprintf(&reply, "%s", "ERROR"); |
671 | } | |
672 | else { | |
b73a4c47 | 673 | DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu); |
204141ee PMF |
674 | asprintf(&reply, "%s", "OK"); |
675 | } | |
676 | ||
677 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
678 | if(result) { | |
27e84572 | 679 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
680 | free(reply); |
681 | retval = -1; | |
682 | goto free_channel_and_cpu; | |
683 | } | |
684 | ||
685 | free(reply); | |
686 | break; | |
687 | } | |
688 | } | |
689 | if(found == 0) { | |
2ddb81a8 | 690 | ERR("unable to find channel"); |
204141ee PMF |
691 | } |
692 | ||
204141ee PMF |
693 | free_short_chan_name: |
694 | free(ch_name); | |
2ddb81a8 PMF |
695 | free_consumed_old_str: |
696 | free(consumed_old_str); | |
697 | free_channel_and_cpu: | |
698 | free(channel_and_cpu); | |
204141ee PMF |
699 | |
700 | end: | |
701 | return retval; | |
702 | } | |
703 | ||
872037bb | 704 | void *listener_main(void *p) |
98963de4 PMF |
705 | { |
706 | int result; | |
707 | ||
26cc7017 PMF |
708 | ust_register_thread(); |
709 | ||
b0540e11 PMF |
710 | DBG("LISTENER"); |
711 | ||
98963de4 | 712 | for(;;) { |
aafb1650 PMF |
713 | char trace_name[] = "auto"; |
714 | char trace_type[] = "ustrelay"; | |
d0b5f2b9 PMF |
715 | char *recvbuf; |
716 | int len; | |
b02e31e5 | 717 | struct ustcomm_source src; |
98963de4 | 718 | |
3a7b90de PMF |
719 | process_blocked_consumers(); |
720 | ||
721 | result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5); | |
722 | if(result < 0) { | |
d0b5f2b9 PMF |
723 | WARN("error in ustcomm_app_recv_message"); |
724 | continue; | |
725 | } | |
3a7b90de PMF |
726 | else if(result == 0) { |
727 | /* no message */ | |
728 | continue; | |
729 | } | |
98963de4 | 730 | |
08230db7 | 731 | DBG("received a message! it's: %s", recvbuf); |
d0b5f2b9 | 732 | len = strlen(recvbuf); |
98963de4 | 733 | |
d0b5f2b9 | 734 | if(!strcmp(recvbuf, "print_markers")) { |
52c51a47 PMF |
735 | print_markers(stderr); |
736 | } | |
737 | else if(!strcmp(recvbuf, "list_markers")) { | |
738 | char *ptr; | |
739 | size_t size; | |
740 | FILE *fp; | |
741 | ||
742 | fp = open_memstream(&ptr, &size); | |
743 | print_markers(fp); | |
744 | fclose(fp); | |
745 | ||
746 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src); | |
747 | ||
748 | free(ptr); | |
749 | } | |
750 | else if(!strcmp(recvbuf, "start")) { | |
751 | /* start is an operation that setups the trace, allocates it and starts it */ | |
752 | result = ltt_trace_setup(trace_name); | |
753 | if(result < 0) { | |
754 | ERR("ltt_trace_setup failed"); | |
872037bb | 755 | return (void *)1; |
52c51a47 PMF |
756 | } |
757 | ||
758 | result = ltt_trace_set_type(trace_name, trace_type); | |
759 | if(result < 0) { | |
760 | ERR("ltt_trace_set_type failed"); | |
872037bb | 761 | return (void *)1; |
52c51a47 PMF |
762 | } |
763 | ||
764 | result = ltt_trace_alloc(trace_name); | |
765 | if(result < 0) { | |
766 | ERR("ltt_trace_alloc failed"); | |
872037bb | 767 | return (void *)1; |
52c51a47 PMF |
768 | } |
769 | ||
ad45e833 | 770 | inform_consumer_daemon(trace_name); |
52c51a47 PMF |
771 | |
772 | result = ltt_trace_start(trace_name); | |
773 | if(result < 0) { | |
774 | ERR("ltt_trace_start failed"); | |
775 | continue; | |
776 | } | |
d0b5f2b9 PMF |
777 | } |
778 | else if(!strcmp(recvbuf, "trace_setup")) { | |
779 | DBG("trace setup"); | |
fbd8191b | 780 | |
d0b5f2b9 PMF |
781 | result = ltt_trace_setup(trace_name); |
782 | if(result < 0) { | |
783 | ERR("ltt_trace_setup failed"); | |
872037bb | 784 | return (void *)1; |
fbd8191b | 785 | } |
d0b5f2b9 PMF |
786 | |
787 | result = ltt_trace_set_type(trace_name, trace_type); | |
788 | if(result < 0) { | |
789 | ERR("ltt_trace_set_type failed"); | |
872037bb | 790 | return (void *)1; |
fbd8191b | 791 | } |
d0b5f2b9 PMF |
792 | } |
793 | else if(!strcmp(recvbuf, "trace_alloc")) { | |
794 | DBG("trace alloc"); | |
795 | ||
796 | result = ltt_trace_alloc(trace_name); | |
797 | if(result < 0) { | |
798 | ERR("ltt_trace_alloc failed"); | |
872037bb | 799 | return (void *)1; |
fbd8191b | 800 | } |
d0b5f2b9 | 801 | } |
62ec620f PMF |
802 | else if(!strcmp(recvbuf, "trace_create")) { |
803 | DBG("trace create"); | |
804 | ||
805 | result = ltt_trace_setup(trace_name); | |
806 | if(result < 0) { | |
807 | ERR("ltt_trace_setup failed"); | |
808 | return (void *)1; | |
809 | } | |
810 | ||
811 | result = ltt_trace_set_type(trace_name, trace_type); | |
812 | if(result < 0) { | |
813 | ERR("ltt_trace_set_type failed"); | |
814 | return (void *)1; | |
815 | } | |
816 | ||
817 | result = ltt_trace_alloc(trace_name); | |
818 | if(result < 0) { | |
819 | ERR("ltt_trace_alloc failed"); | |
820 | return (void *)1; | |
821 | } | |
822 | ||
823 | inform_consumer_daemon(trace_name); | |
824 | } | |
d0b5f2b9 PMF |
825 | else if(!strcmp(recvbuf, "trace_start")) { |
826 | DBG("trace start"); | |
827 | ||
828 | result = ltt_trace_start(trace_name); | |
829 | if(result < 0) { | |
830 | ERR("ltt_trace_start failed"); | |
831 | continue; | |
fbd8191b | 832 | } |
d0b5f2b9 PMF |
833 | } |
834 | else if(!strcmp(recvbuf, "trace_stop")) { | |
835 | DBG("trace stop"); | |
836 | ||
837 | result = ltt_trace_stop(trace_name); | |
838 | if(result < 0) { | |
839 | ERR("ltt_trace_stop failed"); | |
872037bb | 840 | return (void *)1; |
aafb1650 | 841 | } |
d0b5f2b9 PMF |
842 | } |
843 | else if(!strcmp(recvbuf, "trace_destroy")) { | |
aafb1650 | 844 | |
d0b5f2b9 | 845 | DBG("trace destroy"); |
aafb1650 | 846 | |
d0b5f2b9 PMF |
847 | result = ltt_trace_destroy(trace_name); |
848 | if(result < 0) { | |
849 | ERR("ltt_trace_destroy failed"); | |
872037bb | 850 | return (void *)1; |
fbd8191b | 851 | } |
98963de4 | 852 | } |
b02e31e5 | 853 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
204141ee | 854 | do_cmd_get_shmid(recvbuf, &src); |
811e4b93 PMF |
855 | } |
856 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { | |
204141ee | 857 | do_cmd_get_n_subbufs(recvbuf, &src); |
811e4b93 PMF |
858 | } |
859 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { | |
204141ee | 860 | do_cmd_get_subbuf_size(recvbuf, &src); |
3847c3ba | 861 | } |
b02e31e5 PMF |
862 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
863 | char *libfile; | |
864 | ||
865 | libfile = nth_token(recvbuf, 1); | |
866 | ||
867 | DBG("load_probe_lib loading %s", libfile); | |
204141ee PMF |
868 | |
869 | free(libfile); | |
b02e31e5 | 870 | } |
688760ef | 871 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
204141ee | 872 | do_cmd_get_subbuffer(recvbuf, &src); |
688760ef PMF |
873 | } |
874 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { | |
204141ee | 875 | do_cmd_put_subbuffer(recvbuf, &src); |
688760ef | 876 | } |
52c51a47 PMF |
877 | else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { |
878 | char *channel_slash_name = nth_token(recvbuf, 1); | |
879 | char channel_name[256]=""; | |
880 | char marker_name[256]=""; | |
52c51a47 PMF |
881 | |
882 | result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); | |
883 | ||
884 | if(channel_name == NULL || marker_name == NULL) { | |
885 | WARN("invalid marker name"); | |
886 | goto next_cmd; | |
887 | } | |
52c51a47 PMF |
888 | |
889 | result = ltt_marker_connect(channel_name, marker_name, "default"); | |
890 | if(result < 0) { | |
891 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); | |
892 | } | |
893 | } | |
894 | else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { | |
895 | char *channel_slash_name = nth_token(recvbuf, 1); | |
896 | char *marker_name; | |
897 | char *channel_name; | |
52c51a47 PMF |
898 | |
899 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); | |
900 | ||
901 | if(marker_name == NULL) { | |
902 | } | |
52c51a47 PMF |
903 | |
904 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); | |
905 | if(result < 0) { | |
906 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); | |
907 | } | |
908 | } | |
ed1317e7 PMF |
909 | else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) { |
910 | char *reply; | |
911 | ||
912 | asprintf(&reply, "%lld", pidunique); | |
913 | ||
914 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
915 | if(result) { | |
916 | ERR("listener: get_pidunique: ustcomm_send_reply failed"); | |
917 | goto next_cmd; | |
918 | } | |
919 | ||
920 | free(reply); | |
921 | } | |
3a7b90de | 922 | // else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { |
b73a4c47 | 923 | // struct ust_trace *trace; |
3a7b90de PMF |
924 | // char trace_name[] = "auto"; |
925 | // int i; | |
926 | // char *channel_name; | |
927 | // | |
928 | // DBG("get_notifications"); | |
929 | // | |
930 | // channel_name = strdup_malloc(nth_token(recvbuf, 1)); | |
931 | // if(channel_name == NULL) { | |
932 | // ERR("put_subbuf_size: cannot parse channel"); | |
933 | // goto next_cmd; | |
934 | // } | |
935 | // | |
936 | // ltt_lock_traces(); | |
937 | // trace = _ltt_trace_find(trace_name); | |
938 | // ltt_unlock_traces(); | |
939 | // | |
940 | // if(trace == NULL) { | |
63fe14e5 | 941 | // ERR("cannot find trace!"); |
872037bb | 942 | // return (void *)1; |
3a7b90de PMF |
943 | // } |
944 | // | |
945 | // for(i=0; i<trace->nr_channels; i++) { | |
946 | // struct rchan *rchan = trace->channels[i].trans_channel_data; | |
947 | // int fd; | |
948 | // | |
949 | // if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
950 | // struct rchan_buf *rbuf = rchan->buf; | |
951 | // struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; | |
952 | // | |
953 | // result = fd = ustcomm_app_detach_client(&ustcomm_app, &src); | |
954 | // if(result == -1) { | |
955 | // ERR("ustcomm_app_detach_client failed"); | |
956 | // goto next_cmd; | |
957 | // } | |
958 | // | |
959 | // lttbuf->wake_consumer_arg = (void *) fd; | |
960 | // | |
961 | // smp_wmb(); | |
962 | // | |
963 | // lttbuf->call_wake_consumer = 1; | |
964 | // | |
965 | // break; | |
966 | // } | |
967 | // } | |
968 | // | |
969 | // free(channel_name); | |
970 | // } | |
688760ef PMF |
971 | else { |
972 | ERR("unable to parse message: %s", recvbuf); | |
973 | } | |
d0b5f2b9 | 974 | |
811e4b93 | 975 | next_cmd: |
d0b5f2b9 | 976 | free(recvbuf); |
98963de4 PMF |
977 | } |
978 | } | |
979 | ||
7958de40 | 980 | volatile sig_atomic_t have_listener = 0; |
4440ebcb | 981 | |
98963de4 PMF |
982 | void create_listener(void) |
983 | { | |
9160b4e4 | 984 | #ifdef USE_CLONE |
98963de4 | 985 | static char listener_stack[16384]; |
c5fdc888 | 986 | int result; |
4440ebcb PMF |
987 | #else |
988 | pthread_t thread; | |
9160b4e4 | 989 | #endif |
98963de4 | 990 | |
c5fdc888 PMF |
991 | if(have_listener) { |
992 | WARN("not creating listener because we already had one"); | |
4440ebcb | 993 | return; |
c5fdc888 | 994 | } |
4440ebcb | 995 | |
3847c3ba | 996 | #ifdef USE_CLONE |
c5fdc888 | 997 | 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 |
998 | if(result == -1) { |
999 | perror("clone"); | |
4440ebcb | 1000 | return; |
98963de4 | 1001 | } |
3847c3ba | 1002 | #else |
b0540e11 | 1003 | |
3847c3ba PMF |
1004 | pthread_create(&thread, NULL, listener_main, NULL); |
1005 | #endif | |
4440ebcb PMF |
1006 | |
1007 | have_listener = 1; | |
98963de4 PMF |
1008 | } |
1009 | ||
98963de4 | 1010 | static int init_socket(void) |
68c1021b | 1011 | { |
d0b5f2b9 | 1012 | return ustcomm_init_app(getpid(), &ustcomm_app); |
68c1021b PMF |
1013 | } |
1014 | ||
5de74e51 PMF |
1015 | #define AUTOPROBE_DISABLED 0 |
1016 | #define AUTOPROBE_ENABLE_ALL 1 | |
1017 | #define AUTOPROBE_ENABLE_REGEX 2 | |
1018 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
1019 | static regex_t autoprobe_regex; | |
ef290fca | 1020 | |
20b37a31 | 1021 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
1022 | { |
1023 | int result; | |
1024 | ||
5de74e51 PMF |
1025 | char* concat_name = NULL; |
1026 | const char *probe_name = "default"; | |
ef290fca | 1027 | |
5de74e51 | 1028 | if(autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca PMF |
1029 | return; |
1030 | } | |
5de74e51 PMF |
1031 | else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
1032 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); | |
1033 | if(result == -1) { | |
1034 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", | |
1035 | m->channel, m->name); | |
1036 | return; | |
1037 | } | |
1038 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
1039 | free(concat_name); | |
1040 | return; | |
1041 | } | |
1042 | free(concat_name); | |
ef290fca PMF |
1043 | } |
1044 | ||
5de74e51 | 1045 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
acbf228b PMF |
1046 | if(result && result != -EEXIST) |
1047 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); | |
20b37a31 | 1048 | |
3ea1e2fc | 1049 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
ef290fca | 1050 | |
20b37a31 PMF |
1051 | } |
1052 | ||
c1083aa8 | 1053 | static void __attribute__((constructor)) init() |
20b37a31 PMF |
1054 | { |
1055 | int result; | |
5de74e51 | 1056 | char* autoprobe_val = NULL; |
20b37a31 | 1057 | |
ed1317e7 PMF |
1058 | /* Assign the pidunique, to be able to differentiate the processes with same |
1059 | * pid, (before and after an exec). | |
1060 | */ | |
1061 | pidunique = make_pidunique(); | |
1062 | ||
4440ebcb | 1063 | /* Initialize RCU in case the constructor order is not good. */ |
5a66a1f2 | 1064 | rcu_init(); |
4440ebcb PMF |
1065 | |
1066 | /* It is important to do this before events start to be generated. */ | |
1067 | ust_register_thread(); | |
1068 | ||
5de74e51 | 1069 | DBG("Tracectl constructor"); |
20b37a31 | 1070 | |
3847c3ba PMF |
1071 | /* Must create socket before signal handler to prevent races. |
1072 | */ | |
1073 | result = init_socket(); | |
1074 | if(result == -1) { | |
1075 | ERR("init_socket error"); | |
1076 | return; | |
1077 | } | |
2944a629 PMF |
1078 | |
1079 | create_listener(); | |
68c1021b | 1080 | |
5de74e51 PMF |
1081 | autoprobe_val = getenv("UST_AUTOPROBE"); |
1082 | if(autoprobe_val) { | |
4440ebcb PMF |
1083 | struct marker_iter iter; |
1084 | ||
08230db7 | 1085 | DBG("Autoprobe enabled."); |
4440ebcb PMF |
1086 | |
1087 | /* Ensure markers are initialized */ | |
1088 | //init_markers(); | |
1089 | ||
1090 | /* Ensure marker control is initialized, for the probe */ | |
1091 | init_marker_control(); | |
1092 | ||
1093 | /* first, set the callback that will connect the | |
1094 | * probe on new markers | |
1095 | */ | |
5de74e51 PMF |
1096 | if(autoprobe_val[0] == '/') { |
1097 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); | |
1098 | if (result) { | |
1099 | char regexerr[150]; | |
1100 | ||
1101 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
1102 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
1103 | /* don't crash the application just for this */ | |
1104 | } | |
1105 | else { | |
1106 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; | |
1107 | } | |
ef290fca | 1108 | } |
5de74e51 PMF |
1109 | else { |
1110 | /* just enable all instrumentation */ | |
1111 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
1112 | } | |
1113 | ||
1114 | marker_set_new_marker_cb(auto_probe_connect); | |
1115 | ||
4440ebcb PMF |
1116 | /* Now, connect the probes that were already registered. */ |
1117 | marker_iter_reset(&iter); | |
1118 | marker_iter_start(&iter); | |
1119 | ||
08230db7 | 1120 | DBG("now iterating on markers already registered"); |
4440ebcb | 1121 | while(iter.marker) { |
08230db7 | 1122 | DBG("now iterating on marker %s", iter.marker->name); |
4440ebcb PMF |
1123 | auto_probe_connect(iter.marker); |
1124 | marker_iter_next(&iter); | |
1125 | } | |
1126 | } | |
1127 | ||
4db647c5 PMF |
1128 | if(getenv("UST_TRACE")) { |
1129 | char trace_name[] = "auto"; | |
1130 | char trace_type[] = "ustrelay"; | |
1131 | ||
1132 | DBG("starting early tracing"); | |
1133 | ||
1134 | /* Ensure marker control is initialized */ | |
1135 | init_marker_control(); | |
1136 | ||
4db647c5 PMF |
1137 | /* Ensure markers are initialized */ |
1138 | init_markers(); | |
1139 | ||
e17571a5 PMF |
1140 | /* Ensure buffers are initialized, for the transport to be available. |
1141 | * We are about to set a trace type and it will fail without this. | |
1142 | */ | |
1143 | init_ustrelay_transport(); | |
1144 | ||
027ffc9d PMF |
1145 | /* FIXME: When starting early tracing (here), depending on the |
1146 | * order of constructors, it is very well possible some marker | |
1147 | * sections are not yet registered. Because of this, some | |
1148 | * channels may not be registered. Yet, we are about to ask the | |
1149 | * daemon to collect the channels. Channels which are not yet | |
1150 | * registered will not be collected. | |
1151 | * | |
1152 | * Currently, in LTTng, there is no way to add a channel after | |
1153 | * trace start. The reason for this is that it induces complex | |
1154 | * concurrency issues on the trace structures, which can only | |
1155 | * be resolved using RCU. This has not been done yet. As a | |
1156 | * workaround, we are forcing the registration of the "ust" | |
1157 | * channel here. This is the only channel (apart from metadata) | |
1158 | * that can be reliably used in early tracing. | |
1159 | * | |
1160 | * Non-early tracing does not have this problem and can use | |
1161 | * arbitrary channel names. | |
1162 | */ | |
20b37a31 | 1163 | ltt_channels_register("ust"); |
4db647c5 PMF |
1164 | |
1165 | result = ltt_trace_setup(trace_name); | |
1166 | if(result < 0) { | |
1167 | ERR("ltt_trace_setup failed"); | |
1168 | return; | |
1169 | } | |
1170 | ||
1171 | result = ltt_trace_set_type(trace_name, trace_type); | |
1172 | if(result < 0) { | |
1173 | ERR("ltt_trace_set_type failed"); | |
1174 | return; | |
1175 | } | |
1176 | ||
1177 | result = ltt_trace_alloc(trace_name); | |
1178 | if(result < 0) { | |
1179 | ERR("ltt_trace_alloc failed"); | |
1180 | return; | |
1181 | } | |
1182 | ||
1183 | result = ltt_trace_start(trace_name); | |
1184 | if(result < 0) { | |
1185 | ERR("ltt_trace_start failed"); | |
1186 | return; | |
1187 | } | |
60e57148 PMF |
1188 | |
1189 | /* Do this after the trace is started in order to avoid creating confusion | |
1190 | * if the trace fails to start. */ | |
1191 | inform_consumer_daemon(trace_name); | |
4db647c5 PMF |
1192 | } |
1193 | ||
68c1021b PMF |
1194 | |
1195 | return; | |
1196 | ||
1197 | /* should decrementally destroy stuff if error */ | |
1198 | ||
1199 | } | |
1200 | ||
1201 | /* This is only called if we terminate normally, not with an unhandled signal, | |
6d45c11a PMF |
1202 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
1203 | * the last sub-buffer contain a valid end time for the trace. This is done | |
1204 | * automatically only when the trace is properly stopped. | |
1205 | * | |
1206 | * If the traced program crashed, it is always possible to manually add the | |
1207 | * right value in the header, or to open the trace in text mode. | |
1208 | * | |
1209 | * FIXME: Fix LTTV so it doesn't need this. | |
1210 | */ | |
68c1021b | 1211 | |
6d45c11a | 1212 | static void destroy_traces(void) |
68c1021b | 1213 | { |
6d45c11a | 1214 | int result; |
a584bc4e PMF |
1215 | |
1216 | /* if trace running, finish it */ | |
1217 | ||
6d45c11a | 1218 | DBG("destructor stopping traces"); |
a584bc4e | 1219 | |
6d45c11a PMF |
1220 | result = ltt_trace_stop("auto"); |
1221 | if(result == -1) { | |
1222 | ERR("ltt_trace_stop error"); | |
1223 | } | |
1224 | ||
1225 | result = ltt_trace_destroy("auto"); | |
1226 | if(result == -1) { | |
1227 | ERR("ltt_trace_destroy error"); | |
1228 | } | |
68c1021b | 1229 | } |
1e2944cb | 1230 | |
97d9b88b PMF |
1231 | static int trace_recording(void) |
1232 | { | |
1233 | int retval = 0; | |
b73a4c47 | 1234 | struct ust_trace *trace; |
97d9b88b PMF |
1235 | |
1236 | ltt_lock_traces(); | |
1237 | ||
1238 | list_for_each_entry(trace, <t_traces.head, list) { | |
1239 | if(trace->active) { | |
1240 | retval = 1; | |
1241 | break; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | ltt_unlock_traces(); | |
1246 | ||
1247 | return retval; | |
1248 | } | |
1249 | ||
f293009f | 1250 | #if 0 |
97d9b88b PMF |
1251 | static int have_consumer(void) |
1252 | { | |
1253 | return !list_empty(&blocked_consumers); | |
1254 | } | |
f293009f | 1255 | #endif |
97d9b88b | 1256 | |
f293009f | 1257 | int restarting_usleep(useconds_t usecs) |
97d9b88b PMF |
1258 | { |
1259 | struct timespec tv; | |
1260 | int result; | |
1261 | ||
f293009f PMF |
1262 | tv.tv_sec = 0; |
1263 | tv.tv_nsec = usecs * 1000; | |
97d9b88b PMF |
1264 | |
1265 | do { | |
1266 | result = nanosleep(&tv, &tv); | |
1267 | } while(result == -1 && errno == EINTR); | |
1268 | ||
1269 | return result; | |
1270 | } | |
1271 | ||
f293009f PMF |
1272 | /* This destructor keeps the process alive for a few seconds in order |
1273 | * to leave time to ustd to connect to its buffers. This is necessary | |
1274 | * for programs whose execution is very short. It is also useful in all | |
1275 | * programs when tracing is started close to the end of the program | |
1276 | * execution. | |
1277 | * | |
1278 | * FIXME: For now, this only works for the first trace created in a | |
1279 | * process. | |
1280 | */ | |
1281 | ||
97d9b88b PMF |
1282 | static void __attribute__((destructor)) keepalive() |
1283 | { | |
f293009f | 1284 | if(trace_recording() && buffers_to_export) { |
c472cce0 | 1285 | int total = 0; |
f293009f PMF |
1286 | DBG("Keeping process alive for consumer daemon..."); |
1287 | while(buffers_to_export) { | |
1288 | const int interv = 200000; | |
c472cce0 | 1289 | restarting_usleep(interv); |
f293009f PMF |
1290 | total += interv; |
1291 | ||
1292 | if(total >= 3000000) { | |
c472cce0 | 1293 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
f293009f PMF |
1294 | break; |
1295 | } | |
1296 | } | |
1297 | DBG("Finally dying..."); | |
1298 | } | |
6d45c11a PMF |
1299 | |
1300 | destroy_traces(); | |
1301 | ||
1302 | ustcomm_fini_app(&ustcomm_app); | |
97d9b88b | 1303 | } |
97d9b88b | 1304 | |
775c8a3f | 1305 | void ust_potential_exec(void) |
c396a841 PMF |
1306 | { |
1307 | trace_mark(ust, potential_exec, MARK_NOARGS); | |
1308 | ||
775c8a3f PMF |
1309 | DBG("test"); |
1310 | ||
c396a841 PMF |
1311 | keepalive(); |
1312 | } | |
1313 | ||
1e2944cb PMF |
1314 | /* Notify ust that there was a fork. This needs to be called inside |
1315 | * the new process, anytime a process whose memory is not shared with | |
1316 | * the parent is created. If this function is not called, the events | |
1317 | * of the new process will not be collected. | |
616ed36a PMF |
1318 | * |
1319 | * Signals should be disabled before the fork and reenabled only after | |
1320 | * this call in order to guarantee tracing is not started before ust_fork() | |
1321 | * sanitizes the new process. | |
1e2944cb PMF |
1322 | */ |
1323 | ||
616ed36a | 1324 | static void ust_fork(void) |
1e2944cb | 1325 | { |
99b72dc0 PMF |
1326 | struct blocked_consumer *bc; |
1327 | struct blocked_consumer *deletable_bc = NULL; | |
1328 | int result; | |
1329 | ||
1e2944cb PMF |
1330 | DBG("ust: forking"); |
1331 | ltt_trace_stop("auto"); | |
1332 | ltt_trace_destroy("auto"); | |
99b72dc0 PMF |
1333 | /* Delete all active connections */ |
1334 | ustcomm_close_all_connections(&ustcomm_app.server); | |
1335 | ||
1336 | /* Delete all blocked consumers */ | |
1337 | list_for_each_entry(bc, &blocked_consumers, list) { | |
d9ce395d PMF |
1338 | close(bc->fd_producer); |
1339 | close(bc->fd_consumer); | |
99b72dc0 PMF |
1340 | free(deletable_bc); |
1341 | deletable_bc = bc; | |
1342 | list_del(&bc->list); | |
1343 | } | |
1344 | ||
1e2944cb PMF |
1345 | have_listener = 0; |
1346 | create_listener(); | |
99b72dc0 PMF |
1347 | init_socket(); |
1348 | ltt_trace_setup("auto"); | |
1349 | result = ltt_trace_set_type("auto", "ustrelay"); | |
1350 | if(result < 0) { | |
1351 | ERR("ltt_trace_set_type failed"); | |
036db133 | 1352 | return; |
99b72dc0 PMF |
1353 | } |
1354 | ||
1355 | ltt_trace_alloc("auto"); | |
1356 | ltt_trace_start("auto"); | |
ad45e833 | 1357 | inform_consumer_daemon("auto"); |
1e2944cb PMF |
1358 | } |
1359 | ||
616ed36a PMF |
1360 | void ust_before_fork(ust_fork_info_t *fork_info) |
1361 | { | |
1362 | /* Disable signals. This is to avoid that the child | |
1363 | * intervenes before it is properly setup for tracing. It is | |
1364 | * safer to disable all signals, because then we know we are not | |
1365 | * breaking anything by restoring the original mask. | |
1366 | */ | |
1367 | sigset_t all_sigs; | |
1368 | int result; | |
1369 | ||
1370 | /* FIXME: | |
1371 | - only do this if tracing is active | |
1372 | */ | |
1373 | ||
1374 | /* Disable signals */ | |
1375 | sigfillset(&all_sigs); | |
1376 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); | |
1377 | if(result == -1) { | |
1378 | PERROR("sigprocmask"); | |
1379 | return; | |
1380 | } | |
1381 | } | |
1382 | ||
1383 | /* Don't call this function directly in a traced program */ | |
1384 | static void ust_after_fork_common(ust_fork_info_t *fork_info) | |
1385 | { | |
1386 | int result; | |
616ed36a PMF |
1387 | |
1388 | /* Restore signals */ | |
1389 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); | |
1390 | if(result == -1) { | |
1391 | PERROR("sigprocmask"); | |
1392 | return; | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | void ust_after_fork_parent(ust_fork_info_t *fork_info) | |
1397 | { | |
1398 | /* Reenable signals */ | |
1399 | ust_after_fork_common(fork_info); | |
1400 | } | |
1401 | ||
1402 | void ust_after_fork_child(ust_fork_info_t *fork_info) | |
1403 | { | |
1404 | /* First sanitize the child */ | |
1405 | ust_fork(); | |
1406 | ||
1407 | /* Then reenable interrupts */ | |
1408 | ust_after_fork_common(fork_info); | |
1409 | } | |
1410 |