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 | ||
1eba9d6b PMF |
18 | /* This file contains the implementation of the UST listener thread, which |
19 | * receives trace control commands. It also coordinates the initialization of | |
20 | * libust. | |
21 | */ | |
22 | ||
872037bb | 23 | #define _GNU_SOURCE |
68c1021b | 24 | #include <stdio.h> |
909bc43f | 25 | #include <stdlib.h> |
68c1021b | 26 | #include <stdint.h> |
f51d84ea | 27 | #include <pthread.h> |
68c1021b PMF |
28 | #include <signal.h> |
29 | #include <sys/types.h> | |
30 | #include <sys/socket.h> | |
31 | #include <sys/un.h> | |
a584bc4e | 32 | #include <fcntl.h> |
3a7b90de | 33 | #include <poll.h> |
ef290fca | 34 | #include <regex.h> |
b102c2b0 | 35 | #include <urcu/uatomic_arch.h> |
fbd8191b | 36 | |
93d0f2ea | 37 | #include <ust/marker.h> |
616ed36a | 38 | #include <ust/tracectl.h> |
c93858f1 | 39 | #include "tracer.h" |
6af64c43 | 40 | #include "usterr.h" |
d0b5f2b9 | 41 | #include "ustcomm.h" |
b73a4c47 | 42 | #include "buffers.h" |
9160b4e4 | 43 | #include "marker-control.h" |
0e4b45ac | 44 | #include "multipoll.h" |
fbd8191b | 45 | |
68c1021b PMF |
46 | #define USTSIGNAL SIGIO |
47 | ||
98963de4 PMF |
48 | #define MAX_MSG_SIZE (100) |
49 | #define MSG_NOTIF 1 | |
50 | #define MSG_REGISTER_NOTIF 2 | |
51 | ||
ed1317e7 PMF |
52 | /* This should only be accessed by the constructor, before the creation |
53 | * of the listener, and then only by the listener. | |
54 | */ | |
55 | s64 pidunique = -1LL; | |
56 | ||
223f2e7c AH |
57 | extern struct chan_info_struct chan_infos[]; |
58 | ||
3a7b90de PMF |
59 | struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers); |
60 | ||
d0b5f2b9 PMF |
61 | static struct ustcomm_app ustcomm_app; |
62 | ||
68c1021b PMF |
63 | struct tracecmd { /* no padding */ |
64 | uint32_t size; | |
65 | uint16_t command; | |
66 | }; | |
67 | ||
f293009f | 68 | /* volatile because shared between the listener and the main thread */ |
8649cd59 | 69 | int buffers_to_export = 0; |
f293009f | 70 | |
98963de4 PMF |
71 | struct trctl_msg { |
72 | /* size: the size of all the fields except size itself */ | |
73 | uint32_t size; | |
74 | uint16_t type; | |
75 | /* Only the necessary part of the payload is transferred. It | |
76 | * may even be none of it. | |
77 | */ | |
78 | char payload[94]; | |
79 | }; | |
68c1021b | 80 | |
a584bc4e PMF |
81 | struct consumer_channel { |
82 | int fd; | |
83 | struct ltt_channel_struct *chan; | |
84 | }; | |
85 | ||
3a7b90de PMF |
86 | struct blocked_consumer { |
87 | int fd_consumer; | |
88 | int fd_producer; | |
89 | int tmp_poll_idx; | |
90 | ||
91 | /* args to ustcomm_send_reply */ | |
92 | struct ustcomm_server server; | |
93 | struct ustcomm_source src; | |
94 | ||
b73a4c47 | 95 | /* args to ust_buffers_get_subbuf */ |
b5b073e2 | 96 | struct ust_buffer *buf; |
3a7b90de PMF |
97 | |
98 | struct list_head list; | |
99 | }; | |
100 | ||
ed1317e7 PMF |
101 | static long long make_pidunique(void) |
102 | { | |
103 | s64 retval; | |
104 | struct timeval tv; | |
105 | ||
106 | gettimeofday(&tv, NULL); | |
107 | ||
108 | retval = tv.tv_sec; | |
109 | retval <<= 32; | |
110 | retval |= tv.tv_usec; | |
111 | ||
112 | return retval; | |
113 | } | |
114 | ||
52c51a47 | 115 | static void print_markers(FILE *fp) |
fbd8191b PMF |
116 | { |
117 | struct marker_iter iter; | |
118 | ||
d0b5f2b9 | 119 | lock_markers(); |
fbd8191b PMF |
120 | marker_iter_reset(&iter); |
121 | marker_iter_start(&iter); | |
122 | ||
123 | while(iter.marker) { | |
3ea1e2fc | 124 | 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 |
125 | marker_iter_next(&iter); |
126 | } | |
d0b5f2b9 | 127 | unlock_markers(); |
fbd8191b PMF |
128 | } |
129 | ||
4440ebcb | 130 | static int init_socket(void); |
68c1021b | 131 | |
ad45e833 PMF |
132 | /* Ask the daemon to collect a trace called trace_name and being |
133 | * produced by this pid. | |
134 | * | |
135 | * The trace must be at least allocated. (It can also be started.) | |
136 | * This is because _ltt_trace_find is used. | |
137 | */ | |
138 | ||
139 | static void inform_consumer_daemon(const char *trace_name) | |
d0b5f2b9 | 140 | { |
204141ee | 141 | int i,j; |
b73a4c47 | 142 | struct ust_trace *trace; |
ad45e833 PMF |
143 | pid_t pid = getpid(); |
144 | int result; | |
145 | ||
146 | ltt_lock_traces(); | |
147 | ||
148 | trace = _ltt_trace_find(trace_name); | |
149 | if(trace == NULL) { | |
150 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); | |
151 | goto finish; | |
152 | } | |
153 | ||
154 | for(i=0; i < trace->nr_channels; i++) { | |
8649cd59 PMF |
155 | if(trace->channels[i].request_collection) { |
156 | /* iterate on all cpus */ | |
157 | for(j=0; j<trace->channels[i].n_cpus; j++) { | |
158 | char *buf; | |
08b8805e DG |
159 | if (asprintf(&buf, "%s_%d", trace->channels[i].channel_name, j) < 0) { |
160 | ERR("inform_consumer_daemon : asprintf failed (%s_%d)", | |
161 | trace->channels[i].channel_name, j); | |
162 | goto finish; | |
163 | } | |
8649cd59 PMF |
164 | result = ustcomm_request_consumer(pid, buf); |
165 | if(result == -1) { | |
166 | WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name); | |
167 | /* continue even if fail */ | |
168 | } | |
169 | free(buf); | |
170 | STORE_SHARED(buffers_to_export, LOAD_SHARED(buffers_to_export)+1); | |
204141ee | 171 | } |
ad45e833 PMF |
172 | } |
173 | } | |
174 | ||
175 | finish: | |
176 | ltt_unlock_traces(); | |
d0b5f2b9 | 177 | } |
fbd8191b | 178 | |
0e4b45ac | 179 | int process_blkd_consumer_act(void *priv, int fd, short events) |
3a7b90de | 180 | { |
3a7b90de | 181 | int result; |
0e4b45ac PMF |
182 | long consumed_old = 0; |
183 | char *reply; | |
184 | struct blocked_consumer *bc = (struct blocked_consumer *) priv; | |
185 | char inbuf; | |
3a7b90de | 186 | |
0e4b45ac | 187 | result = read(bc->fd_producer, &inbuf, 1); |
3a7b90de | 188 | if(result == -1) { |
0e4b45ac PMF |
189 | PERROR("read"); |
190 | return -1; | |
3a7b90de | 191 | } |
0e4b45ac PMF |
192 | if(result == 0) { |
193 | int res; | |
194 | DBG("listener: got messsage that a buffer ended"); | |
3a7b90de | 195 | |
0e4b45ac PMF |
196 | res = close(bc->fd_producer); |
197 | if(res == -1) { | |
198 | PERROR("close"); | |
199 | } | |
3a7b90de | 200 | |
0e4b45ac PMF |
201 | list_del(&bc->list); |
202 | ||
203 | result = ustcomm_send_reply(&bc->server, "END", &bc->src); | |
204 | if(result < 0) { | |
205 | ERR("ustcomm_send_reply failed"); | |
206 | return -1; | |
207 | } | |
3a7b90de | 208 | |
0e4b45ac PMF |
209 | return 0; |
210 | } | |
3a7b90de | 211 | |
0e4b45ac PMF |
212 | result = ust_buffers_get_subbuf(bc->buf, &consumed_old); |
213 | if(result == -EAGAIN) { | |
214 | WARN("missed buffer?"); | |
215 | return 0; | |
216 | } | |
217 | else if(result < 0) { | |
218 | ERR("ust_buffers_get_subbuf: error: %s", strerror(-result)); | |
219 | } | |
08b8805e DG |
220 | if (asprintf(&reply, "%s %ld", "OK", consumed_old) < 0) { |
221 | ERR("process_blkd_consumer_act : asprintf failed (OK %ld)", | |
222 | consumed_old); | |
223 | return -1; | |
224 | } | |
0e4b45ac PMF |
225 | result = ustcomm_send_reply(&bc->server, reply, &bc->src); |
226 | if(result < 0) { | |
227 | ERR("ustcomm_send_reply failed"); | |
228 | free(reply); | |
229 | return -1; | |
230 | } | |
231 | free(reply); | |
3a7b90de | 232 | |
0e4b45ac | 233 | list_del(&bc->list); |
3a7b90de | 234 | |
0e4b45ac PMF |
235 | return 0; |
236 | } | |
3a7b90de | 237 | |
0e4b45ac PMF |
238 | void blocked_consumers_add_to_mp(struct mpentries *ent) |
239 | { | |
240 | struct blocked_consumer *bc; | |
3a7b90de | 241 | |
0e4b45ac PMF |
242 | list_for_each_entry(bc, &blocked_consumers, list) { |
243 | multipoll_add(ent, bc->fd_producer, POLLIN, process_blkd_consumer_act, bc, NULL); | |
3a7b90de PMF |
244 | } |
245 | ||
246 | } | |
247 | ||
204141ee PMF |
248 | void seperate_channel_cpu(const char *channel_and_cpu, char **channel, int *cpu) |
249 | { | |
250 | const char *sep; | |
251 | ||
252 | sep = rindex(channel_and_cpu, '_'); | |
253 | if(sep == NULL) { | |
254 | *cpu = -1; | |
255 | sep = channel_and_cpu + strlen(channel_and_cpu); | |
256 | } | |
257 | else { | |
258 | *cpu = atoi(sep+1); | |
259 | } | |
260 | ||
08b8805e DG |
261 | if (asprintf(channel, "%.*s", (int)(sep-channel_and_cpu), channel_and_cpu) < 0) { |
262 | ERR("seperate_channel_cpu : asprintf failed (%.*s)", | |
263 | (int)(sep-channel_and_cpu), channel_and_cpu); | |
264 | return; | |
265 | } | |
204141ee PMF |
266 | } |
267 | ||
268 | static int do_cmd_get_shmid(const char *recvbuf, struct ustcomm_source *src) | |
269 | { | |
270 | int retval = 0; | |
b73a4c47 | 271 | struct ust_trace *trace; |
204141ee PMF |
272 | char trace_name[] = "auto"; |
273 | int i; | |
274 | char *channel_and_cpu; | |
275 | int found = 0; | |
276 | int result; | |
277 | char *ch_name; | |
278 | int ch_cpu; | |
279 | ||
280 | DBG("get_shmid"); | |
281 | ||
282 | channel_and_cpu = nth_token(recvbuf, 1); | |
283 | if(channel_and_cpu == NULL) { | |
27e84572 | 284 | ERR("cannot parse channel"); |
5624d402 | 285 | retval = -1; |
204141ee PMF |
286 | goto end; |
287 | } | |
288 | ||
289 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
290 | if(ch_cpu == -1) { | |
27e84572 | 291 | ERR("problem parsing channel name"); |
5624d402 | 292 | retval = -1; |
204141ee PMF |
293 | goto free_short_chan_name; |
294 | } | |
295 | ||
296 | ltt_lock_traces(); | |
297 | trace = _ltt_trace_find(trace_name); | |
298 | ltt_unlock_traces(); | |
299 | ||
300 | if(trace == NULL) { | |
301 | ERR("cannot find trace!"); | |
302 | retval = -1; | |
303 | goto free_short_chan_name; | |
304 | } | |
305 | ||
306 | for(i=0; i<trace->nr_channels; i++) { | |
307 | struct ust_channel *channel = &trace->channels[i]; | |
308 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
309 | ||
310 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
311 | char *reply; | |
312 | ||
313 | // DBG("the shmid for the requested channel is %d", buf->shmid); | |
314 | // DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids); | |
08b8805e DG |
315 | if (asprintf(&reply, "%d %d", buf->shmid, channel->buf_struct_shmids[ch_cpu]) < 0) { |
316 | ERR("do_cmd_get_shmid : asprintf failed (%d %d)", | |
317 | buf->shmid, channel->buf_struct_shmids[ch_cpu]); | |
318 | retval = -1; | |
319 | goto free_short_chan_name; | |
320 | } | |
204141ee PMF |
321 | |
322 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
323 | if(result) { | |
27e84572 | 324 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
325 | free(reply); |
326 | retval = -1; | |
327 | goto free_short_chan_name; | |
328 | } | |
329 | ||
330 | free(reply); | |
331 | ||
332 | found = 1; | |
333 | break; | |
334 | } | |
335 | } | |
336 | ||
d5adede0 | 337 | if(!found) { |
27e84572 | 338 | ERR("channel not found (%s)", channel_and_cpu); |
204141ee PMF |
339 | } |
340 | ||
341 | free_short_chan_name: | |
342 | free(ch_name); | |
343 | ||
344 | end: | |
345 | return retval; | |
346 | } | |
347 | ||
348 | static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src) | |
349 | { | |
350 | int retval = 0; | |
b73a4c47 | 351 | struct ust_trace *trace; |
204141ee PMF |
352 | char trace_name[] = "auto"; |
353 | int i; | |
354 | char *channel_and_cpu; | |
355 | int found = 0; | |
356 | int result; | |
357 | char *ch_name; | |
358 | int ch_cpu; | |
359 | ||
360 | DBG("get_n_subbufs"); | |
361 | ||
362 | channel_and_cpu = nth_token(recvbuf, 1); | |
363 | if(channel_and_cpu == NULL) { | |
27e84572 | 364 | ERR("cannot parse channel"); |
5624d402 | 365 | retval = -1; |
204141ee PMF |
366 | goto end; |
367 | } | |
368 | ||
369 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
370 | if(ch_cpu == -1) { | |
27e84572 | 371 | ERR("problem parsing channel name"); |
5624d402 | 372 | retval = -1; |
204141ee PMF |
373 | goto free_short_chan_name; |
374 | } | |
375 | ||
376 | ltt_lock_traces(); | |
377 | trace = _ltt_trace_find(trace_name); | |
378 | ltt_unlock_traces(); | |
379 | ||
380 | if(trace == NULL) { | |
381 | ERR("cannot find trace!"); | |
382 | retval = -1; | |
383 | goto free_short_chan_name; | |
384 | } | |
385 | ||
386 | for(i=0; i<trace->nr_channels; i++) { | |
387 | struct ust_channel *channel = &trace->channels[i]; | |
388 | ||
389 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
390 | char *reply; | |
391 | ||
392 | DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt); | |
08b8805e DG |
393 | if (asprintf(&reply, "%d", channel->subbuf_cnt) < 0) { |
394 | ERR("do_cmd_get_n_subbufs : asprintf failed (%d)", | |
395 | channel->subbuf_cnt); | |
396 | retval = -1; | |
397 | goto free_short_chan_name; | |
398 | } | |
204141ee PMF |
399 | |
400 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
401 | if(result) { | |
27e84572 | 402 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
403 | free(reply); |
404 | retval = -1; | |
405 | goto free_short_chan_name; | |
406 | } | |
407 | ||
408 | free(reply); | |
409 | found = 1; | |
410 | break; | |
411 | } | |
412 | } | |
413 | if(found == 0) { | |
27e84572 | 414 | ERR("unable to find channel"); |
204141ee PMF |
415 | } |
416 | ||
417 | free_short_chan_name: | |
418 | free(ch_name); | |
419 | ||
420 | end: | |
421 | return retval; | |
422 | } | |
423 | ||
424 | static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src) | |
425 | { | |
426 | int retval = 0; | |
b73a4c47 | 427 | struct ust_trace *trace; |
204141ee PMF |
428 | char trace_name[] = "auto"; |
429 | int i; | |
430 | char *channel_and_cpu; | |
431 | int found = 0; | |
432 | int result; | |
433 | char *ch_name; | |
434 | int ch_cpu; | |
435 | ||
436 | DBG("get_subbuf_size"); | |
437 | ||
438 | channel_and_cpu = nth_token(recvbuf, 1); | |
439 | if(channel_and_cpu == NULL) { | |
27e84572 | 440 | ERR("cannot parse channel"); |
5624d402 | 441 | retval = -1; |
204141ee PMF |
442 | goto end; |
443 | } | |
444 | ||
445 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
446 | if(ch_cpu == -1) { | |
27e84572 | 447 | ERR("problem parsing channel name"); |
5624d402 | 448 | retval = -1; |
204141ee PMF |
449 | goto free_short_chan_name; |
450 | } | |
451 | ||
452 | ltt_lock_traces(); | |
453 | trace = _ltt_trace_find(trace_name); | |
454 | ltt_unlock_traces(); | |
455 | ||
456 | if(trace == NULL) { | |
457 | ERR("cannot find trace!"); | |
458 | retval = -1; | |
459 | goto free_short_chan_name; | |
460 | } | |
461 | ||
462 | for(i=0; i<trace->nr_channels; i++) { | |
463 | struct ust_channel *channel = &trace->channels[i]; | |
464 | ||
465 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
466 | char *reply; | |
467 | ||
468 | DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size); | |
08b8805e DG |
469 | if (asprintf(&reply, "%zd", channel->subbuf_size) < 0) { |
470 | ERR("do_cmd_get_subbuf_size : asprintf failed (%zd)", | |
471 | channel->subbuf_size); | |
472 | retval = -1; | |
473 | goto free_short_chan_name; | |
474 | } | |
204141ee PMF |
475 | |
476 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
477 | if(result) { | |
27e84572 | 478 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
479 | free(reply); |
480 | retval = -1; | |
481 | goto free_short_chan_name; | |
482 | } | |
483 | ||
484 | free(reply); | |
485 | found = 1; | |
486 | break; | |
487 | } | |
488 | } | |
489 | if(found == 0) { | |
27e84572 | 490 | ERR("unable to find channel"); |
204141ee PMF |
491 | } |
492 | ||
493 | free_short_chan_name: | |
494 | free(ch_name); | |
495 | ||
496 | end: | |
497 | return retval; | |
498 | } | |
499 | ||
a80e6dd8 | 500 | /* Return the power of two which is equal or higher to v */ |
763f41e5 | 501 | |
a80e6dd8 PMF |
502 | static unsigned int pow2_higher_or_eq(unsigned int v) |
503 | { | |
504 | int hb = fls(v); | |
a80e6dd8 PMF |
505 | int retval = 1<<(hb-1); |
506 | ||
507 | if(v-retval == 0) | |
508 | return retval; | |
509 | else | |
510 | return retval<<1; | |
763f41e5 DS |
511 | } |
512 | ||
513 | static int do_cmd_set_subbuf_size(const char *recvbuf, struct ustcomm_source *src) | |
514 | { | |
515 | char *channel_slash_size; | |
516 | char ch_name[256]=""; | |
517 | unsigned int size, power; | |
518 | int retval = 0; | |
519 | struct ust_trace *trace; | |
520 | char trace_name[] = "auto"; | |
521 | int i; | |
522 | int found = 0; | |
523 | ||
524 | DBG("set_subbuf_size"); | |
525 | ||
526 | channel_slash_size = nth_token(recvbuf, 1); | |
527 | sscanf(channel_slash_size, "%255[^/]/%u", ch_name, &size); | |
528 | ||
529 | if(ch_name == NULL) { | |
530 | ERR("cannot parse channel"); | |
5624d402 | 531 | retval = -1; |
763f41e5 DS |
532 | goto end; |
533 | } | |
534 | ||
a80e6dd8 PMF |
535 | power = pow2_higher_or_eq(size); |
536 | power = max_t(unsigned int, 2u, power); | |
763f41e5 | 537 | if (power != size) |
a80e6dd8 | 538 | WARN("using the next power of two for buffer size = %u\n", power); |
763f41e5 DS |
539 | |
540 | ltt_lock_traces(); | |
541 | trace = _ltt_trace_find_setup(trace_name); | |
542 | if(trace == NULL) { | |
543 | ERR("cannot find trace!"); | |
763f41e5 DS |
544 | retval = -1; |
545 | goto end; | |
546 | } | |
547 | ||
548 | for(i = 0; i < trace->nr_channels; i++) { | |
549 | struct ust_channel *channel = &trace->channels[i]; | |
550 | ||
551 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
552 | ||
553 | channel->subbuf_size = power; | |
554 | DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size); | |
555 | ||
556 | found = 1; | |
557 | break; | |
558 | } | |
559 | } | |
560 | if(found == 0) { | |
561 | ERR("unable to find channel"); | |
562 | } | |
563 | ||
763f41e5 | 564 | end: |
86dd0ebc | 565 | ltt_unlock_traces(); |
763f41e5 DS |
566 | return retval; |
567 | } | |
568 | ||
569 | static int do_cmd_set_subbuf_num(const char *recvbuf, struct ustcomm_source *src) | |
570 | { | |
571 | char *channel_slash_num; | |
572 | char ch_name[256]=""; | |
573 | unsigned int num; | |
574 | int retval = 0; | |
575 | struct ust_trace *trace; | |
576 | char trace_name[] = "auto"; | |
577 | int i; | |
578 | int found = 0; | |
579 | ||
580 | DBG("set_subbuf_num"); | |
581 | ||
582 | channel_slash_num = nth_token(recvbuf, 1); | |
583 | sscanf(channel_slash_num, "%255[^/]/%u", ch_name, &num); | |
584 | ||
585 | if(ch_name == NULL) { | |
586 | ERR("cannot parse channel"); | |
5624d402 | 587 | retval = -1; |
763f41e5 DS |
588 | goto end; |
589 | } | |
590 | if (num < 2) { | |
591 | ERR("subbuffer count should be greater than 2"); | |
5624d402 | 592 | retval = -1; |
763f41e5 DS |
593 | goto end; |
594 | } | |
595 | ||
596 | ltt_lock_traces(); | |
597 | trace = _ltt_trace_find_setup(trace_name); | |
598 | if(trace == NULL) { | |
599 | ERR("cannot find trace!"); | |
763f41e5 DS |
600 | retval = -1; |
601 | goto end; | |
602 | } | |
603 | ||
604 | for(i = 0; i < trace->nr_channels; i++) { | |
605 | struct ust_channel *channel = &trace->channels[i]; | |
606 | ||
607 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
608 | ||
609 | channel->subbuf_cnt = num; | |
610 | DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt); | |
611 | ||
612 | found = 1; | |
613 | break; | |
614 | } | |
615 | } | |
616 | if(found == 0) { | |
617 | ERR("unable to find channel"); | |
618 | } | |
619 | ||
763f41e5 | 620 | end: |
86dd0ebc | 621 | ltt_unlock_traces(); |
763f41e5 DS |
622 | return retval; |
623 | } | |
624 | ||
204141ee PMF |
625 | static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src) |
626 | { | |
627 | int retval = 0; | |
b73a4c47 | 628 | struct ust_trace *trace; |
204141ee PMF |
629 | char trace_name[] = "auto"; |
630 | int i; | |
631 | char *channel_and_cpu; | |
632 | int found = 0; | |
633 | char *ch_name; | |
634 | int ch_cpu; | |
635 | ||
636 | DBG("get_subbuf"); | |
637 | ||
638 | channel_and_cpu = nth_token(recvbuf, 1); | |
639 | if(channel_and_cpu == NULL) { | |
27e84572 | 640 | ERR("cannot parse channel"); |
5624d402 | 641 | retval = -1; |
204141ee PMF |
642 | goto end; |
643 | } | |
644 | ||
645 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
646 | if(ch_cpu == -1) { | |
27e84572 | 647 | ERR("problem parsing channel name"); |
5624d402 | 648 | retval = -1; |
204141ee PMF |
649 | goto free_short_chan_name; |
650 | } | |
651 | ||
652 | ltt_lock_traces(); | |
653 | trace = _ltt_trace_find(trace_name); | |
204141ee PMF |
654 | |
655 | if(trace == NULL) { | |
2ddb81a8 PMF |
656 | int result; |
657 | ||
753e1b51 | 658 | DBG("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 659 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
2ddb81a8 PMF |
660 | if(result) { |
661 | ERR("ustcomm_send_reply failed"); | |
2ddb81a8 | 662 | retval = -1; |
86dd0ebc | 663 | goto unlock_traces; |
2ddb81a8 PMF |
664 | } |
665 | ||
86dd0ebc | 666 | goto unlock_traces; |
204141ee PMF |
667 | } |
668 | ||
669 | for(i=0; i<trace->nr_channels; i++) { | |
670 | struct ust_channel *channel = &trace->channels[i]; | |
671 | ||
672 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
673 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
674 | struct blocked_consumer *bc; | |
675 | ||
676 | found = 1; | |
677 | ||
1dba3e6c | 678 | bc = (struct blocked_consumer *) zmalloc(sizeof(struct blocked_consumer)); |
204141ee | 679 | if(bc == NULL) { |
1dba3e6c | 680 | ERR("zmalloc returned NULL"); |
86dd0ebc | 681 | goto unlock_traces; |
204141ee PMF |
682 | } |
683 | bc->fd_consumer = src->fd; | |
684 | bc->fd_producer = buf->data_ready_fd_read; | |
685 | bc->buf = buf; | |
686 | bc->src = *src; | |
687 | bc->server = ustcomm_app.server; | |
688 | ||
689 | list_add(&bc->list, &blocked_consumers); | |
690 | ||
d5adede0 PMF |
691 | /* Being here is the proof the daemon has mapped the buffer in its |
692 | * memory. We may now decrement buffers_to_export. | |
693 | */ | |
b102c2b0 | 694 | if(uatomic_read(&buf->consumed) == 0) { |
d5adede0 | 695 | DBG("decrementing buffers_to_export"); |
8649cd59 | 696 | STORE_SHARED(buffers_to_export, LOAD_SHARED(buffers_to_export)-1); |
d5adede0 PMF |
697 | } |
698 | ||
204141ee PMF |
699 | break; |
700 | } | |
701 | } | |
702 | if(found == 0) { | |
27e84572 | 703 | ERR("unable to find channel"); |
204141ee PMF |
704 | } |
705 | ||
86dd0ebc PMF |
706 | unlock_traces: |
707 | ltt_unlock_traces(); | |
708 | ||
204141ee PMF |
709 | free_short_chan_name: |
710 | free(ch_name); | |
711 | ||
712 | end: | |
713 | return retval; | |
714 | } | |
715 | ||
716 | static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src) | |
717 | { | |
718 | int retval = 0; | |
b73a4c47 | 719 | struct ust_trace *trace; |
204141ee PMF |
720 | char trace_name[] = "auto"; |
721 | int i; | |
722 | char *channel_and_cpu; | |
723 | int found = 0; | |
724 | int result; | |
725 | char *ch_name; | |
726 | int ch_cpu; | |
727 | long consumed_old; | |
728 | char *consumed_old_str; | |
729 | char *endptr; | |
2ddb81a8 | 730 | char *reply = NULL; |
204141ee PMF |
731 | |
732 | DBG("put_subbuf"); | |
733 | ||
ce2ccc12 | 734 | channel_and_cpu = strdup(nth_token(recvbuf, 1)); |
204141ee | 735 | if(channel_and_cpu == NULL) { |
27e84572 | 736 | ERR("cannot parse channel"); |
204141ee PMF |
737 | retval = -1; |
738 | goto end; | |
739 | } | |
740 | ||
ce2ccc12 | 741 | consumed_old_str = strdup(nth_token(recvbuf, 2)); |
204141ee | 742 | if(consumed_old_str == NULL) { |
27e84572 | 743 | ERR("cannot parse consumed_old"); |
204141ee PMF |
744 | retval = -1; |
745 | goto free_channel_and_cpu; | |
746 | } | |
747 | consumed_old = strtol(consumed_old_str, &endptr, 10); | |
748 | if(*endptr != '\0') { | |
27e84572 | 749 | ERR("invalid value for consumed_old"); |
204141ee PMF |
750 | retval = -1; |
751 | goto free_consumed_old_str; | |
752 | } | |
753 | ||
754 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
755 | if(ch_cpu == -1) { | |
27e84572 | 756 | ERR("problem parsing channel name"); |
204141ee PMF |
757 | retval = -1; |
758 | goto free_short_chan_name; | |
759 | } | |
760 | ||
761 | ltt_lock_traces(); | |
762 | trace = _ltt_trace_find(trace_name); | |
204141ee PMF |
763 | |
764 | if(trace == NULL) { | |
753e1b51 | 765 | DBG("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 766 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
2ddb81a8 PMF |
767 | if(result) { |
768 | ERR("ustcomm_send_reply failed"); | |
2ddb81a8 | 769 | retval = -1; |
86dd0ebc | 770 | goto unlock_traces; |
2ddb81a8 PMF |
771 | } |
772 | ||
86dd0ebc | 773 | goto unlock_traces; |
204141ee PMF |
774 | } |
775 | ||
776 | for(i=0; i<trace->nr_channels; i++) { | |
777 | struct ust_channel *channel = &trace->channels[i]; | |
778 | ||
779 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { | |
780 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
204141ee PMF |
781 | |
782 | found = 1; | |
783 | ||
b73a4c47 | 784 | result = ust_buffers_put_subbuf(buf, consumed_old); |
204141ee | 785 | if(result < 0) { |
b73a4c47 | 786 | WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu); |
08b8805e DG |
787 | if (asprintf(&reply, "%s", "ERROR") < 0) { |
788 | ERR("do_cmd_put_subbuffer : asprintf failed (ERROR)"); | |
789 | retval = -1; | |
790 | goto unlock_traces; | |
791 | } | |
204141ee PMF |
792 | } |
793 | else { | |
b73a4c47 | 794 | DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu); |
08b8805e DG |
795 | if (asprintf(&reply, "%s", "OK") < 0) { |
796 | ERR("do_cmd_put_subbuffer : asprintf failed (OK)"); | |
797 | retval = -1; | |
798 | goto unlock_traces; | |
799 | } | |
204141ee PMF |
800 | } |
801 | ||
802 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
803 | if(result) { | |
27e84572 | 804 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
805 | free(reply); |
806 | retval = -1; | |
86dd0ebc | 807 | goto unlock_traces; |
204141ee PMF |
808 | } |
809 | ||
810 | free(reply); | |
811 | break; | |
812 | } | |
813 | } | |
814 | if(found == 0) { | |
2ddb81a8 | 815 | ERR("unable to find channel"); |
204141ee PMF |
816 | } |
817 | ||
86dd0ebc PMF |
818 | unlock_traces: |
819 | ltt_unlock_traces(); | |
204141ee PMF |
820 | free_short_chan_name: |
821 | free(ch_name); | |
2ddb81a8 PMF |
822 | free_consumed_old_str: |
823 | free(consumed_old_str); | |
824 | free_channel_and_cpu: | |
825 | free(channel_and_cpu); | |
204141ee PMF |
826 | |
827 | end: | |
828 | return retval; | |
829 | } | |
830 | ||
fc253ce0 PMF |
831 | static void listener_cleanup(void *ptr) |
832 | { | |
833 | ustcomm_fini_app(&ustcomm_app, 0); | |
834 | } | |
835 | ||
b9318b35 AH |
836 | static void do_cmd_force_switch() |
837 | { | |
838 | struct blocked_consumer *bc; | |
839 | ||
840 | list_for_each_entry(bc, &blocked_consumers, list) { | |
841 | ltt_force_switch(bc->buf, FORCE_FLUSH); | |
842 | } | |
843 | } | |
844 | ||
0e4b45ac | 845 | int process_client_cmd(char *recvbuf, struct ustcomm_source *src) |
98963de4 PMF |
846 | { |
847 | int result; | |
0e4b45ac PMF |
848 | char trace_name[] = "auto"; |
849 | char trace_type[] = "ustrelay"; | |
850 | int len; | |
98963de4 | 851 | |
0e4b45ac PMF |
852 | DBG("received a message! it's: %s", recvbuf); |
853 | len = strlen(recvbuf); | |
b0540e11 | 854 | |
0e4b45ac PMF |
855 | if(!strcmp(recvbuf, "print_markers")) { |
856 | print_markers(stderr); | |
857 | } | |
858 | else if(!strcmp(recvbuf, "list_markers")) { | |
859 | char *ptr; | |
860 | size_t size; | |
861 | FILE *fp; | |
fc253ce0 | 862 | |
0e4b45ac PMF |
863 | fp = open_memstream(&ptr, &size); |
864 | print_markers(fp); | |
865 | fclose(fp); | |
98963de4 | 866 | |
0e4b45ac | 867 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, src); |
3a7b90de | 868 | |
0e4b45ac PMF |
869 | free(ptr); |
870 | } | |
871 | else if(!strcmp(recvbuf, "start")) { | |
872 | /* start is an operation that setups the trace, allocates it and starts it */ | |
873 | result = ltt_trace_setup(trace_name); | |
3a7b90de | 874 | if(result < 0) { |
0e4b45ac PMF |
875 | ERR("ltt_trace_setup failed"); |
876 | return -1; | |
3a7b90de | 877 | } |
98963de4 | 878 | |
0e4b45ac PMF |
879 | result = ltt_trace_set_type(trace_name, trace_type); |
880 | if(result < 0) { | |
881 | ERR("ltt_trace_set_type failed"); | |
882 | return -1; | |
52c51a47 | 883 | } |
52c51a47 | 884 | |
0e4b45ac PMF |
885 | result = ltt_trace_alloc(trace_name); |
886 | if(result < 0) { | |
887 | ERR("ltt_trace_alloc failed"); | |
888 | return -1; | |
52c51a47 | 889 | } |
52c51a47 | 890 | |
0e4b45ac | 891 | inform_consumer_daemon(trace_name); |
52c51a47 | 892 | |
0e4b45ac PMF |
893 | result = ltt_trace_start(trace_name); |
894 | if(result < 0) { | |
895 | ERR("ltt_trace_start failed"); | |
896 | return -1; | |
d0b5f2b9 | 897 | } |
0e4b45ac PMF |
898 | } |
899 | else if(!strcmp(recvbuf, "trace_setup")) { | |
900 | DBG("trace setup"); | |
d0b5f2b9 | 901 | |
0e4b45ac PMF |
902 | result = ltt_trace_setup(trace_name); |
903 | if(result < 0) { | |
904 | ERR("ltt_trace_setup failed"); | |
905 | return -1; | |
d0b5f2b9 | 906 | } |
d0b5f2b9 | 907 | |
0e4b45ac PMF |
908 | result = ltt_trace_set_type(trace_name, trace_type); |
909 | if(result < 0) { | |
910 | ERR("ltt_trace_set_type failed"); | |
911 | return -1; | |
d0b5f2b9 | 912 | } |
0e4b45ac PMF |
913 | } |
914 | else if(!strcmp(recvbuf, "trace_alloc")) { | |
915 | DBG("trace alloc"); | |
62ec620f | 916 | |
0e4b45ac PMF |
917 | result = ltt_trace_alloc(trace_name); |
918 | if(result < 0) { | |
919 | ERR("ltt_trace_alloc failed"); | |
920 | return -1; | |
763f41e5 | 921 | } |
0e4b45ac PMF |
922 | inform_consumer_daemon(trace_name); |
923 | } | |
924 | else if(!strcmp(recvbuf, "trace_create")) { | |
925 | DBG("trace create"); | |
d0b5f2b9 | 926 | |
0e4b45ac PMF |
927 | result = ltt_trace_setup(trace_name); |
928 | if(result < 0) { | |
929 | ERR("ltt_trace_setup failed"); | |
930 | return -1; | |
d0b5f2b9 | 931 | } |
d0b5f2b9 | 932 | |
0e4b45ac PMF |
933 | result = ltt_trace_set_type(trace_name, trace_type); |
934 | if(result < 0) { | |
935 | ERR("ltt_trace_set_type failed"); | |
936 | return -1; | |
d0b5f2b9 | 937 | } |
0e4b45ac PMF |
938 | } |
939 | else if(!strcmp(recvbuf, "trace_start")) { | |
940 | DBG("trace start"); | |
aafb1650 | 941 | |
0e4b45ac PMF |
942 | result = ltt_trace_alloc(trace_name); |
943 | if(result < 0) { | |
944 | ERR("ltt_trace_alloc failed"); | |
945 | return -1; | |
811e4b93 | 946 | } |
0e4b45ac PMF |
947 | if(!result) { |
948 | inform_consumer_daemon(trace_name); | |
811e4b93 | 949 | } |
0e4b45ac PMF |
950 | |
951 | result = ltt_trace_start(trace_name); | |
952 | if(result < 0) { | |
953 | ERR("ltt_trace_start failed"); | |
954 | return -1; | |
3847c3ba | 955 | } |
0e4b45ac PMF |
956 | } |
957 | else if(!strcmp(recvbuf, "trace_stop")) { | |
958 | DBG("trace stop"); | |
b02e31e5 | 959 | |
0e4b45ac PMF |
960 | result = ltt_trace_stop(trace_name); |
961 | if(result < 0) { | |
962 | ERR("ltt_trace_stop failed"); | |
963 | return -1; | |
964 | } | |
965 | } | |
966 | else if(!strcmp(recvbuf, "trace_destroy")) { | |
b02e31e5 | 967 | |
0e4b45ac | 968 | DBG("trace destroy"); |
204141ee | 969 | |
0e4b45ac PMF |
970 | result = ltt_trace_destroy(trace_name, 0); |
971 | if(result < 0) { | |
972 | ERR("ltt_trace_destroy failed"); | |
973 | return -1; | |
763f41e5 | 974 | } |
0e4b45ac PMF |
975 | } |
976 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { | |
977 | do_cmd_get_shmid(recvbuf, src); | |
978 | } | |
979 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { | |
980 | do_cmd_get_n_subbufs(recvbuf, src); | |
981 | } | |
982 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { | |
983 | do_cmd_get_subbuf_size(recvbuf, src); | |
984 | } | |
985 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { | |
986 | char *libfile; | |
52c51a47 | 987 | |
0e4b45ac | 988 | libfile = nth_token(recvbuf, 1); |
52c51a47 | 989 | |
0e4b45ac | 990 | DBG("load_probe_lib loading %s", libfile); |
52c51a47 | 991 | |
0e4b45ac PMF |
992 | free(libfile); |
993 | } | |
994 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { | |
995 | do_cmd_get_subbuffer(recvbuf, src); | |
996 | } | |
997 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { | |
998 | do_cmd_put_subbuffer(recvbuf, src); | |
999 | } | |
1000 | else if(nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) { | |
1001 | do_cmd_set_subbuf_size(recvbuf, src); | |
1002 | } | |
1003 | else if(nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) { | |
1004 | do_cmd_set_subbuf_num(recvbuf, src); | |
1005 | } | |
1006 | else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { | |
1007 | char *channel_slash_name = nth_token(recvbuf, 1); | |
1008 | char channel_name[256]=""; | |
1009 | char marker_name[256]=""; | |
1010 | ||
1011 | result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); | |
1012 | ||
1013 | if(channel_name == NULL || marker_name == NULL) { | |
1014 | WARN("invalid marker name"); | |
1015 | goto next_cmd; | |
52c51a47 | 1016 | } |
52c51a47 | 1017 | |
0e4b45ac PMF |
1018 | result = ltt_marker_connect(channel_name, marker_name, "default"); |
1019 | if(result < 0) { | |
1020 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); | |
1021 | } | |
1022 | } | |
1023 | else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { | |
1024 | char *channel_slash_name = nth_token(recvbuf, 1); | |
1025 | char *marker_name; | |
1026 | char *channel_name; | |
52c51a47 | 1027 | |
0e4b45ac | 1028 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); |
52c51a47 | 1029 | |
0e4b45ac | 1030 | if(marker_name == NULL) { |
52c51a47 | 1031 | } |
ed1317e7 | 1032 | |
0e4b45ac PMF |
1033 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); |
1034 | if(result < 0) { | |
1035 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); | |
1036 | } | |
1037 | } | |
1038 | else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) { | |
1039 | char *reply; | |
ed1317e7 | 1040 | |
08b8805e DG |
1041 | if (asprintf(&reply, "%lld", pidunique) < 0) { |
1042 | ERR("process_client_cmd : asprintf failed (%lld)", | |
1043 | pidunique); | |
1044 | goto next_cmd; | |
1045 | } | |
ed1317e7 | 1046 | |
0e4b45ac PMF |
1047 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
1048 | if(result) { | |
1049 | ERR("listener: get_pidunique: ustcomm_send_reply failed"); | |
1050 | goto next_cmd; | |
ed1317e7 | 1051 | } |
0e4b45ac PMF |
1052 | |
1053 | free(reply); | |
1054 | } | |
b2fb2f91 AH |
1055 | else if(nth_token_is(recvbuf, "get_sock_path", 0) == 1) { |
1056 | char *reply = getenv("UST_DAEMON_SOCKET"); | |
1057 | if(!reply) { | |
08b8805e DG |
1058 | if (asprintf(&reply, "%s/%s", SOCK_DIR, "ustd") < 0) { |
1059 | ERR("process_client_cmd : asprintf failed (%s/ustd)", | |
1060 | SOCK_DIR); | |
1061 | goto next_cmd; | |
1062 | } | |
b2fb2f91 AH |
1063 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
1064 | free(reply); | |
1065 | } | |
1066 | else { | |
1067 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
1068 | } | |
1069 | if(result) | |
1070 | ERR("ustcomm_send_reply failed"); | |
1071 | } | |
1072 | else if(nth_token_is(recvbuf, "set_sock_path", 0) == 1) { | |
1073 | char *sock_path = nth_token(recvbuf, 1); | |
1074 | result = setenv("UST_DAEMON_SOCKET", sock_path, 1); | |
1075 | if(result) | |
1076 | ERR("cannot set UST_DAEMON_SOCKET environment variable"); | |
1077 | } | |
b9318b35 AH |
1078 | else if(nth_token_is(recvbuf, "force_switch", 0) == 1) { |
1079 | do_cmd_force_switch(); | |
1080 | } | |
0e4b45ac PMF |
1081 | else { |
1082 | ERR("unable to parse message: %s", recvbuf); | |
1083 | } | |
1084 | ||
1085 | next_cmd: | |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | void *listener_main(void *p) | |
1091 | { | |
1092 | int result; | |
1093 | ||
1094 | DBG("LISTENER"); | |
1095 | ||
1096 | pthread_cleanup_push(listener_cleanup, NULL); | |
1097 | ||
1098 | for(;;) { | |
1099 | struct mpentries mpent; | |
1100 | ||
1101 | multipoll_init(&mpent); | |
1102 | ||
1103 | blocked_consumers_add_to_mp(&mpent); | |
1104 | ustcomm_mp_add_app_clients(&mpent, &ustcomm_app, process_client_cmd); | |
1105 | ||
1106 | result = multipoll_poll(&mpent, -1); | |
1107 | if(result == -1) { | |
1108 | ERR("error in multipoll_poll"); | |
688760ef | 1109 | } |
d0b5f2b9 | 1110 | |
0e4b45ac | 1111 | multipoll_destroy(&mpent); |
98963de4 | 1112 | } |
fc253ce0 PMF |
1113 | |
1114 | pthread_cleanup_pop(1); | |
98963de4 PMF |
1115 | } |
1116 | ||
cd03ff7f PMF |
1117 | /* These should only be accessed in the parent thread, |
1118 | * not the listener. | |
1119 | */ | |
ce45335c | 1120 | static volatile sig_atomic_t have_listener = 0; |
fc253ce0 | 1121 | static pthread_t listener_thread; |
4440ebcb | 1122 | |
98963de4 PMF |
1123 | void create_listener(void) |
1124 | { | |
c5fdc888 | 1125 | int result; |
f51d84ea PMF |
1126 | sigset_t sig_all_blocked; |
1127 | sigset_t orig_parent_mask; | |
98963de4 | 1128 | |
c5fdc888 PMF |
1129 | if(have_listener) { |
1130 | WARN("not creating listener because we already had one"); | |
4440ebcb | 1131 | return; |
c5fdc888 | 1132 | } |
4440ebcb | 1133 | |
f51d84ea PMF |
1134 | /* A new thread created by pthread_create inherits the signal mask |
1135 | * from the parent. To avoid any signal being received by the | |
1136 | * listener thread, we block all signals temporarily in the parent, | |
1137 | * while we create the listener thread. | |
1138 | */ | |
1139 | ||
1140 | sigfillset(&sig_all_blocked); | |
1141 | ||
1142 | result = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_parent_mask); | |
1143 | if(result) { | |
1144 | PERROR("pthread_sigmask: %s", strerror(result)); | |
1145 | } | |
1146 | ||
cd03ff7f | 1147 | result = pthread_create(&listener_thread, NULL, listener_main, NULL); |
98963de4 | 1148 | if(result == -1) { |
cd03ff7f | 1149 | PERROR("pthread_create"); |
98963de4 | 1150 | } |
4440ebcb | 1151 | |
f51d84ea PMF |
1152 | /* Restore original signal mask in parent */ |
1153 | result = pthread_sigmask(SIG_SETMASK, &orig_parent_mask, NULL); | |
1154 | if(result) { | |
1155 | PERROR("pthread_sigmask: %s", strerror(result)); | |
1156 | } | |
4267e589 PMF |
1157 | else { |
1158 | have_listener = 1; | |
1159 | } | |
98963de4 PMF |
1160 | } |
1161 | ||
98963de4 | 1162 | static int init_socket(void) |
68c1021b | 1163 | { |
d0b5f2b9 | 1164 | return ustcomm_init_app(getpid(), &ustcomm_app); |
68c1021b PMF |
1165 | } |
1166 | ||
5de74e51 PMF |
1167 | #define AUTOPROBE_DISABLED 0 |
1168 | #define AUTOPROBE_ENABLE_ALL 1 | |
1169 | #define AUTOPROBE_ENABLE_REGEX 2 | |
1170 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
1171 | static regex_t autoprobe_regex; | |
ef290fca | 1172 | |
20b37a31 | 1173 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
1174 | { |
1175 | int result; | |
1176 | ||
5de74e51 PMF |
1177 | char* concat_name = NULL; |
1178 | const char *probe_name = "default"; | |
ef290fca | 1179 | |
5de74e51 | 1180 | if(autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca PMF |
1181 | return; |
1182 | } | |
5de74e51 PMF |
1183 | else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
1184 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); | |
1185 | if(result == -1) { | |
1186 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", | |
1187 | m->channel, m->name); | |
1188 | return; | |
1189 | } | |
1190 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
1191 | free(concat_name); | |
1192 | return; | |
1193 | } | |
1194 | free(concat_name); | |
ef290fca PMF |
1195 | } |
1196 | ||
5de74e51 | 1197 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
acbf228b PMF |
1198 | if(result && result != -EEXIST) |
1199 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); | |
20b37a31 | 1200 | |
3ea1e2fc | 1201 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
ef290fca | 1202 | |
20b37a31 PMF |
1203 | } |
1204 | ||
c1083aa8 | 1205 | static void __attribute__((constructor)) init() |
20b37a31 PMF |
1206 | { |
1207 | int result; | |
5de74e51 | 1208 | char* autoprobe_val = NULL; |
223f2e7c AH |
1209 | char* subbuffer_size_val = NULL; |
1210 | char* subbuffer_count_val = NULL; | |
1211 | unsigned int subbuffer_size; | |
1212 | unsigned int subbuffer_count; | |
1213 | unsigned int power; | |
20b37a31 | 1214 | |
ed1317e7 PMF |
1215 | /* Assign the pidunique, to be able to differentiate the processes with same |
1216 | * pid, (before and after an exec). | |
1217 | */ | |
1218 | pidunique = make_pidunique(); | |
1219 | ||
5de74e51 | 1220 | DBG("Tracectl constructor"); |
20b37a31 | 1221 | |
3847c3ba PMF |
1222 | result = init_socket(); |
1223 | if(result == -1) { | |
1224 | ERR("init_socket error"); | |
1225 | return; | |
1226 | } | |
2944a629 PMF |
1227 | |
1228 | create_listener(); | |
68c1021b | 1229 | |
5de74e51 PMF |
1230 | autoprobe_val = getenv("UST_AUTOPROBE"); |
1231 | if(autoprobe_val) { | |
4440ebcb PMF |
1232 | struct marker_iter iter; |
1233 | ||
08230db7 | 1234 | DBG("Autoprobe enabled."); |
4440ebcb PMF |
1235 | |
1236 | /* Ensure markers are initialized */ | |
1237 | //init_markers(); | |
1238 | ||
1239 | /* Ensure marker control is initialized, for the probe */ | |
1240 | init_marker_control(); | |
1241 | ||
1242 | /* first, set the callback that will connect the | |
1243 | * probe on new markers | |
1244 | */ | |
5de74e51 PMF |
1245 | if(autoprobe_val[0] == '/') { |
1246 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); | |
1247 | if (result) { | |
1248 | char regexerr[150]; | |
1249 | ||
1250 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
1251 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
1252 | /* don't crash the application just for this */ | |
1253 | } | |
1254 | else { | |
1255 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; | |
1256 | } | |
ef290fca | 1257 | } |
5de74e51 PMF |
1258 | else { |
1259 | /* just enable all instrumentation */ | |
1260 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
1261 | } | |
1262 | ||
1263 | marker_set_new_marker_cb(auto_probe_connect); | |
1264 | ||
4440ebcb PMF |
1265 | /* Now, connect the probes that were already registered. */ |
1266 | marker_iter_reset(&iter); | |
1267 | marker_iter_start(&iter); | |
1268 | ||
08230db7 | 1269 | DBG("now iterating on markers already registered"); |
4440ebcb | 1270 | while(iter.marker) { |
08230db7 | 1271 | DBG("now iterating on marker %s", iter.marker->name); |
4440ebcb PMF |
1272 | auto_probe_connect(iter.marker); |
1273 | marker_iter_next(&iter); | |
1274 | } | |
1275 | } | |
1276 | ||
8649cd59 PMF |
1277 | if(getenv("UST_OVERWRITE")) { |
1278 | int val = atoi(getenv("UST_OVERWRITE")); | |
1279 | if(val == 0 || val == 1) { | |
1280 | STORE_SHARED(ust_channels_overwrite_by_default, val); | |
1281 | } | |
1282 | else { | |
1283 | WARN("invalid value for UST_OVERWRITE"); | |
1284 | } | |
1285 | } | |
1286 | ||
1287 | if(getenv("UST_AUTOCOLLECT")) { | |
1288 | int val = atoi(getenv("UST_AUTOCOLLECT")); | |
1289 | if(val == 0 || val == 1) { | |
1290 | STORE_SHARED(ust_channels_request_collection_by_default, val); | |
1291 | } | |
1292 | else { | |
1293 | WARN("invalid value for UST_AUTOCOLLECT"); | |
1294 | } | |
1295 | } | |
1296 | ||
223f2e7c AH |
1297 | subbuffer_size_val = getenv("UST_SUBBUF_SIZE"); |
1298 | if(subbuffer_size_val) { | |
1299 | sscanf(subbuffer_size_val, "%u", &subbuffer_size); | |
1300 | power = pow2_higher_or_eq(subbuffer_size); | |
1301 | if(power != subbuffer_size) | |
1302 | WARN("using the next power of two for buffer size = %u\n", power); | |
1303 | chan_infos[LTT_CHANNEL_UST].def_subbufsize = power; | |
1304 | } | |
1305 | ||
1306 | subbuffer_count_val = getenv("UST_SUBBUF_NUM"); | |
1307 | if(subbuffer_count_val) { | |
1308 | sscanf(subbuffer_count_val, "%u", &subbuffer_count); | |
1309 | if(subbuffer_count < 2) | |
1310 | subbuffer_count = 2; | |
1311 | chan_infos[LTT_CHANNEL_UST].def_subbufcount = subbuffer_count; | |
1312 | } | |
1313 | ||
4db647c5 PMF |
1314 | if(getenv("UST_TRACE")) { |
1315 | char trace_name[] = "auto"; | |
1316 | char trace_type[] = "ustrelay"; | |
1317 | ||
1318 | DBG("starting early tracing"); | |
1319 | ||
1320 | /* Ensure marker control is initialized */ | |
1321 | init_marker_control(); | |
1322 | ||
4db647c5 PMF |
1323 | /* Ensure markers are initialized */ |
1324 | init_markers(); | |
1325 | ||
e17571a5 PMF |
1326 | /* Ensure buffers are initialized, for the transport to be available. |
1327 | * We are about to set a trace type and it will fail without this. | |
1328 | */ | |
1329 | init_ustrelay_transport(); | |
1330 | ||
027ffc9d PMF |
1331 | /* FIXME: When starting early tracing (here), depending on the |
1332 | * order of constructors, it is very well possible some marker | |
1333 | * sections are not yet registered. Because of this, some | |
1334 | * channels may not be registered. Yet, we are about to ask the | |
1335 | * daemon to collect the channels. Channels which are not yet | |
1336 | * registered will not be collected. | |
1337 | * | |
1338 | * Currently, in LTTng, there is no way to add a channel after | |
1339 | * trace start. The reason for this is that it induces complex | |
1340 | * concurrency issues on the trace structures, which can only | |
1341 | * be resolved using RCU. This has not been done yet. As a | |
1342 | * workaround, we are forcing the registration of the "ust" | |
1343 | * channel here. This is the only channel (apart from metadata) | |
1344 | * that can be reliably used in early tracing. | |
1345 | * | |
1346 | * Non-early tracing does not have this problem and can use | |
1347 | * arbitrary channel names. | |
1348 | */ | |
20b37a31 | 1349 | ltt_channels_register("ust"); |
4db647c5 PMF |
1350 | |
1351 | result = ltt_trace_setup(trace_name); | |
1352 | if(result < 0) { | |
1353 | ERR("ltt_trace_setup failed"); | |
1354 | return; | |
1355 | } | |
1356 | ||
1357 | result = ltt_trace_set_type(trace_name, trace_type); | |
1358 | if(result < 0) { | |
1359 | ERR("ltt_trace_set_type failed"); | |
1360 | return; | |
1361 | } | |
1362 | ||
1363 | result = ltt_trace_alloc(trace_name); | |
1364 | if(result < 0) { | |
1365 | ERR("ltt_trace_alloc failed"); | |
1366 | return; | |
1367 | } | |
1368 | ||
1369 | result = ltt_trace_start(trace_name); | |
1370 | if(result < 0) { | |
1371 | ERR("ltt_trace_start failed"); | |
1372 | return; | |
1373 | } | |
60e57148 PMF |
1374 | |
1375 | /* Do this after the trace is started in order to avoid creating confusion | |
1376 | * if the trace fails to start. */ | |
1377 | inform_consumer_daemon(trace_name); | |
4db647c5 PMF |
1378 | } |
1379 | ||
68c1021b PMF |
1380 | return; |
1381 | ||
1382 | /* should decrementally destroy stuff if error */ | |
1383 | ||
1384 | } | |
1385 | ||
1386 | /* This is only called if we terminate normally, not with an unhandled signal, | |
6d45c11a PMF |
1387 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
1388 | * the last sub-buffer contain a valid end time for the trace. This is done | |
1389 | * automatically only when the trace is properly stopped. | |
1390 | * | |
1391 | * If the traced program crashed, it is always possible to manually add the | |
1392 | * right value in the header, or to open the trace in text mode. | |
1393 | * | |
1394 | * FIXME: Fix LTTV so it doesn't need this. | |
1395 | */ | |
68c1021b | 1396 | |
6d45c11a | 1397 | static void destroy_traces(void) |
68c1021b | 1398 | { |
6d45c11a | 1399 | int result; |
a584bc4e PMF |
1400 | |
1401 | /* if trace running, finish it */ | |
1402 | ||
6d45c11a | 1403 | DBG("destructor stopping traces"); |
a584bc4e | 1404 | |
6d45c11a PMF |
1405 | result = ltt_trace_stop("auto"); |
1406 | if(result == -1) { | |
1407 | ERR("ltt_trace_stop error"); | |
1408 | } | |
1409 | ||
31d392f1 | 1410 | result = ltt_trace_destroy("auto", 0); |
6d45c11a PMF |
1411 | if(result == -1) { |
1412 | ERR("ltt_trace_destroy error"); | |
1413 | } | |
68c1021b | 1414 | } |
1e2944cb | 1415 | |
97d9b88b PMF |
1416 | static int trace_recording(void) |
1417 | { | |
1418 | int retval = 0; | |
b73a4c47 | 1419 | struct ust_trace *trace; |
97d9b88b PMF |
1420 | |
1421 | ltt_lock_traces(); | |
1422 | ||
1423 | list_for_each_entry(trace, <t_traces.head, list) { | |
1424 | if(trace->active) { | |
1425 | retval = 1; | |
1426 | break; | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | ltt_unlock_traces(); | |
1431 | ||
1432 | return retval; | |
1433 | } | |
1434 | ||
f293009f | 1435 | #if 0 |
97d9b88b PMF |
1436 | static int have_consumer(void) |
1437 | { | |
1438 | return !list_empty(&blocked_consumers); | |
1439 | } | |
f293009f | 1440 | #endif |
97d9b88b | 1441 | |
f293009f | 1442 | int restarting_usleep(useconds_t usecs) |
97d9b88b PMF |
1443 | { |
1444 | struct timespec tv; | |
1445 | int result; | |
1446 | ||
f293009f PMF |
1447 | tv.tv_sec = 0; |
1448 | tv.tv_nsec = usecs * 1000; | |
97d9b88b PMF |
1449 | |
1450 | do { | |
1451 | result = nanosleep(&tv, &tv); | |
1452 | } while(result == -1 && errno == EINTR); | |
1453 | ||
1454 | return result; | |
1455 | } | |
1456 | ||
4267e589 | 1457 | static void stop_listener(void) |
fc253ce0 PMF |
1458 | { |
1459 | int result; | |
1460 | ||
4267e589 PMF |
1461 | if(!have_listener) |
1462 | return; | |
1463 | ||
fc253ce0 | 1464 | result = pthread_cancel(listener_thread); |
18cbdbac PMF |
1465 | if(result != 0) { |
1466 | ERR("pthread_cancel: %s", strerror(result)); | |
fc253ce0 PMF |
1467 | } |
1468 | result = pthread_join(listener_thread, NULL); | |
18cbdbac PMF |
1469 | if(result != 0) { |
1470 | ERR("pthread_join: %s", strerror(result)); | |
fc253ce0 PMF |
1471 | } |
1472 | } | |
1473 | ||
f293009f PMF |
1474 | /* This destructor keeps the process alive for a few seconds in order |
1475 | * to leave time to ustd to connect to its buffers. This is necessary | |
1476 | * for programs whose execution is very short. It is also useful in all | |
1477 | * programs when tracing is started close to the end of the program | |
1478 | * execution. | |
1479 | * | |
1480 | * FIXME: For now, this only works for the first trace created in a | |
1481 | * process. | |
1482 | */ | |
1483 | ||
97d9b88b PMF |
1484 | static void __attribute__((destructor)) keepalive() |
1485 | { | |
8649cd59 | 1486 | if(trace_recording() && LOAD_SHARED(buffers_to_export)) { |
c472cce0 | 1487 | int total = 0; |
f293009f | 1488 | DBG("Keeping process alive for consumer daemon..."); |
8649cd59 | 1489 | while(LOAD_SHARED(buffers_to_export)) { |
f293009f | 1490 | const int interv = 200000; |
c472cce0 | 1491 | restarting_usleep(interv); |
f293009f PMF |
1492 | total += interv; |
1493 | ||
1494 | if(total >= 3000000) { | |
c472cce0 | 1495 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
f293009f PMF |
1496 | break; |
1497 | } | |
1498 | } | |
1499 | DBG("Finally dying..."); | |
1500 | } | |
6d45c11a PMF |
1501 | |
1502 | destroy_traces(); | |
1503 | ||
fc253ce0 PMF |
1504 | /* Ask the listener to stop and clean up. */ |
1505 | stop_listener(); | |
97d9b88b | 1506 | } |
97d9b88b | 1507 | |
775c8a3f | 1508 | void ust_potential_exec(void) |
c396a841 PMF |
1509 | { |
1510 | trace_mark(ust, potential_exec, MARK_NOARGS); | |
1511 | ||
775c8a3f PMF |
1512 | DBG("test"); |
1513 | ||
c396a841 PMF |
1514 | keepalive(); |
1515 | } | |
1516 | ||
1e2944cb PMF |
1517 | /* Notify ust that there was a fork. This needs to be called inside |
1518 | * the new process, anytime a process whose memory is not shared with | |
1519 | * the parent is created. If this function is not called, the events | |
1520 | * of the new process will not be collected. | |
616ed36a PMF |
1521 | * |
1522 | * Signals should be disabled before the fork and reenabled only after | |
1523 | * this call in order to guarantee tracing is not started before ust_fork() | |
1524 | * sanitizes the new process. | |
1e2944cb PMF |
1525 | */ |
1526 | ||
616ed36a | 1527 | static void ust_fork(void) |
1e2944cb | 1528 | { |
99b72dc0 PMF |
1529 | struct blocked_consumer *bc; |
1530 | struct blocked_consumer *deletable_bc = NULL; | |
1531 | int result; | |
1532 | ||
31d392f1 | 1533 | /* FIXME: technically, the locks could have been taken before the fork */ |
1e2944cb | 1534 | DBG("ust: forking"); |
73850001 PMF |
1535 | |
1536 | /* break lock if necessary */ | |
1537 | ltt_unlock_traces(); | |
1538 | ||
1e2944cb | 1539 | ltt_trace_stop("auto"); |
31d392f1 | 1540 | ltt_trace_destroy("auto", 1); |
99b72dc0 PMF |
1541 | /* Delete all active connections */ |
1542 | ustcomm_close_all_connections(&ustcomm_app.server); | |
1543 | ||
1544 | /* Delete all blocked consumers */ | |
1545 | list_for_each_entry(bc, &blocked_consumers, list) { | |
2c1ccefa PMF |
1546 | result = close(bc->fd_producer); |
1547 | if(result == -1) { | |
1548 | PERROR("close"); | |
1549 | } | |
99b72dc0 PMF |
1550 | free(deletable_bc); |
1551 | deletable_bc = bc; | |
1552 | list_del(&bc->list); | |
1553 | } | |
1554 | ||
2a79ceeb PMF |
1555 | /* free app, keeping socket file */ |
1556 | ustcomm_fini_app(&ustcomm_app, 1); | |
393bc391 | 1557 | |
8649cd59 | 1558 | STORE_SHARED(buffers_to_export, 0); |
1e2944cb | 1559 | have_listener = 0; |
99b72dc0 | 1560 | init_socket(); |
9fb49d0e | 1561 | create_listener(); |
99b72dc0 PMF |
1562 | ltt_trace_setup("auto"); |
1563 | result = ltt_trace_set_type("auto", "ustrelay"); | |
1564 | if(result < 0) { | |
1565 | ERR("ltt_trace_set_type failed"); | |
036db133 | 1566 | return; |
99b72dc0 PMF |
1567 | } |
1568 | ||
1569 | ltt_trace_alloc("auto"); | |
1570 | ltt_trace_start("auto"); | |
ad45e833 | 1571 | inform_consumer_daemon("auto"); |
1e2944cb PMF |
1572 | } |
1573 | ||
616ed36a PMF |
1574 | void ust_before_fork(ust_fork_info_t *fork_info) |
1575 | { | |
1576 | /* Disable signals. This is to avoid that the child | |
1577 | * intervenes before it is properly setup for tracing. It is | |
1578 | * safer to disable all signals, because then we know we are not | |
1579 | * breaking anything by restoring the original mask. | |
1580 | */ | |
1581 | sigset_t all_sigs; | |
1582 | int result; | |
1583 | ||
1584 | /* FIXME: | |
1585 | - only do this if tracing is active | |
1586 | */ | |
1587 | ||
1588 | /* Disable signals */ | |
1589 | sigfillset(&all_sigs); | |
1590 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); | |
1591 | if(result == -1) { | |
1592 | PERROR("sigprocmask"); | |
1593 | return; | |
1594 | } | |
1595 | } | |
1596 | ||
1597 | /* Don't call this function directly in a traced program */ | |
1598 | static void ust_after_fork_common(ust_fork_info_t *fork_info) | |
1599 | { | |
1600 | int result; | |
616ed36a PMF |
1601 | |
1602 | /* Restore signals */ | |
1603 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); | |
1604 | if(result == -1) { | |
1605 | PERROR("sigprocmask"); | |
1606 | return; | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | void ust_after_fork_parent(ust_fork_info_t *fork_info) | |
1611 | { | |
1612 | /* Reenable signals */ | |
1613 | ust_after_fork_common(fork_info); | |
1614 | } | |
1615 | ||
1616 | void ust_after_fork_child(ust_fork_info_t *fork_info) | |
1617 | { | |
1618 | /* First sanitize the child */ | |
1619 | ust_fork(); | |
1620 | ||
1621 | /* Then reenable interrupts */ | |
1622 | ust_after_fork_common(fork_info); | |
1623 | } | |
1624 |