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> |
a3adfb05 | 38 | #include <ust/tracepoint.h> |
616ed36a | 39 | #include <ust/tracectl.h> |
c93858f1 | 40 | #include "tracer.h" |
6af64c43 | 41 | #include "usterr.h" |
d0b5f2b9 | 42 | #include "ustcomm.h" |
b73a4c47 | 43 | #include "buffers.h" |
9160b4e4 | 44 | #include "marker-control.h" |
0e4b45ac | 45 | #include "multipoll.h" |
fbd8191b | 46 | |
68c1021b PMF |
47 | #define USTSIGNAL SIGIO |
48 | ||
98963de4 PMF |
49 | #define MAX_MSG_SIZE (100) |
50 | #define MSG_NOTIF 1 | |
51 | #define MSG_REGISTER_NOTIF 2 | |
52 | ||
ed1317e7 PMF |
53 | /* This should only be accessed by the constructor, before the creation |
54 | * of the listener, and then only by the listener. | |
55 | */ | |
56 | s64 pidunique = -1LL; | |
57 | ||
223f2e7c AH |
58 | extern struct chan_info_struct chan_infos[]; |
59 | ||
3a7b90de PMF |
60 | struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers); |
61 | ||
d0b5f2b9 PMF |
62 | static struct ustcomm_app ustcomm_app; |
63 | ||
68c1021b PMF |
64 | struct tracecmd { /* no padding */ |
65 | uint32_t size; | |
66 | uint16_t command; | |
67 | }; | |
68 | ||
f293009f | 69 | /* volatile because shared between the listener and the main thread */ |
8649cd59 | 70 | int buffers_to_export = 0; |
f293009f | 71 | |
98963de4 PMF |
72 | struct trctl_msg { |
73 | /* size: the size of all the fields except size itself */ | |
74 | uint32_t size; | |
75 | uint16_t type; | |
76 | /* Only the necessary part of the payload is transferred. It | |
77 | * may even be none of it. | |
78 | */ | |
79 | char payload[94]; | |
80 | }; | |
68c1021b | 81 | |
a584bc4e PMF |
82 | struct consumer_channel { |
83 | int fd; | |
84 | struct ltt_channel_struct *chan; | |
85 | }; | |
86 | ||
3a7b90de PMF |
87 | struct blocked_consumer { |
88 | int fd_consumer; | |
89 | int fd_producer; | |
90 | int tmp_poll_idx; | |
91 | ||
92 | /* args to ustcomm_send_reply */ | |
93 | struct ustcomm_server server; | |
94 | struct ustcomm_source src; | |
95 | ||
b73a4c47 | 96 | /* args to ust_buffers_get_subbuf */ |
b5b073e2 | 97 | struct ust_buffer *buf; |
3a7b90de PMF |
98 | |
99 | struct list_head list; | |
100 | }; | |
101 | ||
ed1317e7 PMF |
102 | static long long make_pidunique(void) |
103 | { | |
104 | s64 retval; | |
105 | struct timeval tv; | |
106 | ||
107 | gettimeofday(&tv, NULL); | |
108 | ||
109 | retval = tv.tv_sec; | |
110 | retval <<= 32; | |
111 | retval |= tv.tv_usec; | |
112 | ||
113 | return retval; | |
114 | } | |
115 | ||
52c51a47 | 116 | static void print_markers(FILE *fp) |
fbd8191b PMF |
117 | { |
118 | struct marker_iter iter; | |
119 | ||
d0b5f2b9 | 120 | lock_markers(); |
fbd8191b PMF |
121 | marker_iter_reset(&iter); |
122 | marker_iter_start(&iter); | |
123 | ||
e9b58dc0 | 124 | while (iter.marker) { |
3ea1e2fc | 125 | 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 |
126 | marker_iter_next(&iter); |
127 | } | |
d0b5f2b9 | 128 | unlock_markers(); |
fbd8191b PMF |
129 | } |
130 | ||
a3adfb05 NC |
131 | static void print_trace_events(FILE *fp) |
132 | { | |
133 | struct trace_event_iter iter; | |
134 | ||
135 | lock_trace_events(); | |
136 | trace_event_iter_reset(&iter); | |
137 | trace_event_iter_start(&iter); | |
138 | ||
e9b58dc0 | 139 | while (iter.trace_event) { |
a3adfb05 NC |
140 | fprintf(fp, "trace_event: %s\n", iter.trace_event->name); |
141 | trace_event_iter_next(&iter); | |
142 | } | |
143 | unlock_trace_events(); | |
144 | } | |
145 | ||
4440ebcb | 146 | static int init_socket(void); |
68c1021b | 147 | |
ad45e833 PMF |
148 | /* Ask the daemon to collect a trace called trace_name and being |
149 | * produced by this pid. | |
150 | * | |
151 | * The trace must be at least allocated. (It can also be started.) | |
152 | * This is because _ltt_trace_find is used. | |
153 | */ | |
154 | ||
155 | static void inform_consumer_daemon(const char *trace_name) | |
d0b5f2b9 | 156 | { |
204141ee | 157 | int i,j; |
b73a4c47 | 158 | struct ust_trace *trace; |
ad45e833 PMF |
159 | pid_t pid = getpid(); |
160 | int result; | |
161 | ||
162 | ltt_lock_traces(); | |
163 | ||
164 | trace = _ltt_trace_find(trace_name); | |
e9b58dc0 | 165 | if (trace == NULL) { |
ad45e833 PMF |
166 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); |
167 | goto finish; | |
168 | } | |
169 | ||
e9b58dc0 DS |
170 | for (i=0; i < trace->nr_channels; i++) { |
171 | if (trace->channels[i].request_collection) { | |
8649cd59 | 172 | /* iterate on all cpus */ |
e9b58dc0 | 173 | for (j=0; j<trace->channels[i].n_cpus; j++) { |
8649cd59 | 174 | char *buf; |
08b8805e DG |
175 | if (asprintf(&buf, "%s_%d", trace->channels[i].channel_name, j) < 0) { |
176 | ERR("inform_consumer_daemon : asprintf failed (%s_%d)", | |
177 | trace->channels[i].channel_name, j); | |
178 | goto finish; | |
179 | } | |
8649cd59 | 180 | result = ustcomm_request_consumer(pid, buf); |
e9b58dc0 | 181 | if (result == -1) { |
8649cd59 PMF |
182 | WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name); |
183 | /* continue even if fail */ | |
184 | } | |
185 | free(buf); | |
186 | STORE_SHARED(buffers_to_export, LOAD_SHARED(buffers_to_export)+1); | |
204141ee | 187 | } |
ad45e833 PMF |
188 | } |
189 | } | |
190 | ||
191 | finish: | |
192 | ltt_unlock_traces(); | |
d0b5f2b9 | 193 | } |
fbd8191b | 194 | |
0e4b45ac | 195 | int process_blkd_consumer_act(void *priv, int fd, short events) |
3a7b90de | 196 | { |
3a7b90de | 197 | int result; |
0e4b45ac PMF |
198 | long consumed_old = 0; |
199 | char *reply; | |
200 | struct blocked_consumer *bc = (struct blocked_consumer *) priv; | |
201 | char inbuf; | |
3a7b90de | 202 | |
0e4b45ac | 203 | result = read(bc->fd_producer, &inbuf, 1); |
e9b58dc0 | 204 | if (result == -1) { |
0e4b45ac PMF |
205 | PERROR("read"); |
206 | return -1; | |
3a7b90de | 207 | } |
e9b58dc0 | 208 | if (result == 0) { |
0e4b45ac PMF |
209 | int res; |
210 | DBG("listener: got messsage that a buffer ended"); | |
3a7b90de | 211 | |
0e4b45ac | 212 | res = close(bc->fd_producer); |
e9b58dc0 | 213 | if (res == -1) { |
0e4b45ac PMF |
214 | PERROR("close"); |
215 | } | |
3a7b90de | 216 | |
0e4b45ac PMF |
217 | list_del(&bc->list); |
218 | ||
219 | result = ustcomm_send_reply(&bc->server, "END", &bc->src); | |
e9b58dc0 | 220 | if (result < 0) { |
0e4b45ac PMF |
221 | ERR("ustcomm_send_reply failed"); |
222 | return -1; | |
223 | } | |
3a7b90de | 224 | |
0e4b45ac PMF |
225 | return 0; |
226 | } | |
3a7b90de | 227 | |
0e4b45ac | 228 | result = ust_buffers_get_subbuf(bc->buf, &consumed_old); |
e9b58dc0 | 229 | if (result == -EAGAIN) { |
0e4b45ac PMF |
230 | WARN("missed buffer?"); |
231 | return 0; | |
e9b58dc0 | 232 | } else if (result < 0) { |
0e4b45ac PMF |
233 | ERR("ust_buffers_get_subbuf: error: %s", strerror(-result)); |
234 | } | |
08b8805e DG |
235 | if (asprintf(&reply, "%s %ld", "OK", consumed_old) < 0) { |
236 | ERR("process_blkd_consumer_act : asprintf failed (OK %ld)", | |
237 | consumed_old); | |
238 | return -1; | |
239 | } | |
0e4b45ac | 240 | result = ustcomm_send_reply(&bc->server, reply, &bc->src); |
e9b58dc0 | 241 | if (result < 0) { |
0e4b45ac PMF |
242 | ERR("ustcomm_send_reply failed"); |
243 | free(reply); | |
244 | return -1; | |
245 | } | |
246 | free(reply); | |
3a7b90de | 247 | |
0e4b45ac | 248 | list_del(&bc->list); |
3a7b90de | 249 | |
0e4b45ac PMF |
250 | return 0; |
251 | } | |
3a7b90de | 252 | |
0e4b45ac PMF |
253 | void blocked_consumers_add_to_mp(struct mpentries *ent) |
254 | { | |
255 | struct blocked_consumer *bc; | |
3a7b90de | 256 | |
0e4b45ac PMF |
257 | list_for_each_entry(bc, &blocked_consumers, list) { |
258 | multipoll_add(ent, bc->fd_producer, POLLIN, process_blkd_consumer_act, bc, NULL); | |
3a7b90de PMF |
259 | } |
260 | ||
261 | } | |
262 | ||
204141ee PMF |
263 | void seperate_channel_cpu(const char *channel_and_cpu, char **channel, int *cpu) |
264 | { | |
265 | const char *sep; | |
266 | ||
267 | sep = rindex(channel_and_cpu, '_'); | |
e9b58dc0 | 268 | if (sep == NULL) { |
204141ee PMF |
269 | *cpu = -1; |
270 | sep = channel_and_cpu + strlen(channel_and_cpu); | |
e9b58dc0 | 271 | } else { |
204141ee PMF |
272 | *cpu = atoi(sep+1); |
273 | } | |
274 | ||
08b8805e DG |
275 | if (asprintf(channel, "%.*s", (int)(sep-channel_and_cpu), channel_and_cpu) < 0) { |
276 | ERR("seperate_channel_cpu : asprintf failed (%.*s)", | |
277 | (int)(sep-channel_and_cpu), channel_and_cpu); | |
278 | return; | |
279 | } | |
204141ee PMF |
280 | } |
281 | ||
282 | static int do_cmd_get_shmid(const char *recvbuf, struct ustcomm_source *src) | |
283 | { | |
284 | int retval = 0; | |
b73a4c47 | 285 | struct ust_trace *trace; |
204141ee PMF |
286 | char trace_name[] = "auto"; |
287 | int i; | |
288 | char *channel_and_cpu; | |
289 | int found = 0; | |
290 | int result; | |
291 | char *ch_name; | |
292 | int ch_cpu; | |
293 | ||
294 | DBG("get_shmid"); | |
295 | ||
296 | channel_and_cpu = nth_token(recvbuf, 1); | |
e9b58dc0 | 297 | if (channel_and_cpu == NULL) { |
27e84572 | 298 | ERR("cannot parse channel"); |
5624d402 | 299 | retval = -1; |
204141ee PMF |
300 | goto end; |
301 | } | |
302 | ||
303 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
e9b58dc0 | 304 | if (ch_cpu == -1) { |
27e84572 | 305 | ERR("problem parsing channel name"); |
5624d402 | 306 | retval = -1; |
204141ee PMF |
307 | goto free_short_chan_name; |
308 | } | |
309 | ||
310 | ltt_lock_traces(); | |
311 | trace = _ltt_trace_find(trace_name); | |
312 | ltt_unlock_traces(); | |
313 | ||
e9b58dc0 | 314 | if (trace == NULL) { |
204141ee PMF |
315 | ERR("cannot find trace!"); |
316 | retval = -1; | |
317 | goto free_short_chan_name; | |
318 | } | |
319 | ||
e9b58dc0 | 320 | for (i=0; i<trace->nr_channels; i++) { |
204141ee PMF |
321 | struct ust_channel *channel = &trace->channels[i]; |
322 | struct ust_buffer *buf = channel->buf[ch_cpu]; | |
323 | ||
e9b58dc0 | 324 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
204141ee PMF |
325 | char *reply; |
326 | ||
327 | // DBG("the shmid for the requested channel is %d", buf->shmid); | |
328 | // DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids); | |
08b8805e DG |
329 | if (asprintf(&reply, "%d %d", buf->shmid, channel->buf_struct_shmids[ch_cpu]) < 0) { |
330 | ERR("do_cmd_get_shmid : asprintf failed (%d %d)", | |
331 | buf->shmid, channel->buf_struct_shmids[ch_cpu]); | |
332 | retval = -1; | |
333 | goto free_short_chan_name; | |
334 | } | |
204141ee PMF |
335 | |
336 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
e9b58dc0 | 337 | if (result) { |
27e84572 | 338 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
339 | free(reply); |
340 | retval = -1; | |
341 | goto free_short_chan_name; | |
342 | } | |
343 | ||
344 | free(reply); | |
345 | ||
346 | found = 1; | |
347 | break; | |
348 | } | |
349 | } | |
350 | ||
e9b58dc0 | 351 | if (!found) { |
27e84572 | 352 | ERR("channel not found (%s)", channel_and_cpu); |
204141ee PMF |
353 | } |
354 | ||
355 | free_short_chan_name: | |
356 | free(ch_name); | |
357 | ||
358 | end: | |
359 | return retval; | |
360 | } | |
361 | ||
362 | static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src) | |
363 | { | |
364 | int retval = 0; | |
b73a4c47 | 365 | struct ust_trace *trace; |
204141ee PMF |
366 | char trace_name[] = "auto"; |
367 | int i; | |
368 | char *channel_and_cpu; | |
369 | int found = 0; | |
370 | int result; | |
371 | char *ch_name; | |
372 | int ch_cpu; | |
373 | ||
374 | DBG("get_n_subbufs"); | |
375 | ||
376 | channel_and_cpu = nth_token(recvbuf, 1); | |
e9b58dc0 | 377 | if (channel_and_cpu == NULL) { |
27e84572 | 378 | ERR("cannot parse channel"); |
5624d402 | 379 | retval = -1; |
204141ee PMF |
380 | goto end; |
381 | } | |
382 | ||
383 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
e9b58dc0 | 384 | if (ch_cpu == -1) { |
27e84572 | 385 | ERR("problem parsing channel name"); |
5624d402 | 386 | retval = -1; |
204141ee PMF |
387 | goto free_short_chan_name; |
388 | } | |
389 | ||
390 | ltt_lock_traces(); | |
391 | trace = _ltt_trace_find(trace_name); | |
392 | ltt_unlock_traces(); | |
393 | ||
e9b58dc0 | 394 | if (trace == NULL) { |
204141ee PMF |
395 | ERR("cannot find trace!"); |
396 | retval = -1; | |
397 | goto free_short_chan_name; | |
398 | } | |
399 | ||
e9b58dc0 | 400 | for (i=0; i<trace->nr_channels; i++) { |
204141ee PMF |
401 | struct ust_channel *channel = &trace->channels[i]; |
402 | ||
e9b58dc0 | 403 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
204141ee PMF |
404 | char *reply; |
405 | ||
406 | DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt); | |
08b8805e DG |
407 | if (asprintf(&reply, "%d", channel->subbuf_cnt) < 0) { |
408 | ERR("do_cmd_get_n_subbufs : asprintf failed (%d)", | |
409 | channel->subbuf_cnt); | |
410 | retval = -1; | |
411 | goto free_short_chan_name; | |
412 | } | |
204141ee PMF |
413 | |
414 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
e9b58dc0 | 415 | if (result) { |
27e84572 | 416 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
417 | free(reply); |
418 | retval = -1; | |
419 | goto free_short_chan_name; | |
420 | } | |
421 | ||
422 | free(reply); | |
423 | found = 1; | |
424 | break; | |
425 | } | |
426 | } | |
e9b58dc0 | 427 | if (found == 0) { |
27e84572 | 428 | ERR("unable to find channel"); |
204141ee PMF |
429 | } |
430 | ||
431 | free_short_chan_name: | |
432 | free(ch_name); | |
433 | ||
434 | end: | |
435 | return retval; | |
436 | } | |
437 | ||
438 | static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src) | |
439 | { | |
440 | int retval = 0; | |
b73a4c47 | 441 | struct ust_trace *trace; |
204141ee PMF |
442 | char trace_name[] = "auto"; |
443 | int i; | |
444 | char *channel_and_cpu; | |
445 | int found = 0; | |
446 | int result; | |
447 | char *ch_name; | |
448 | int ch_cpu; | |
449 | ||
450 | DBG("get_subbuf_size"); | |
451 | ||
452 | channel_and_cpu = nth_token(recvbuf, 1); | |
e9b58dc0 | 453 | if (channel_and_cpu == NULL) { |
27e84572 | 454 | ERR("cannot parse channel"); |
5624d402 | 455 | retval = -1; |
204141ee PMF |
456 | goto end; |
457 | } | |
458 | ||
459 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
e9b58dc0 | 460 | if (ch_cpu == -1) { |
27e84572 | 461 | ERR("problem parsing channel name"); |
5624d402 | 462 | retval = -1; |
204141ee PMF |
463 | goto free_short_chan_name; |
464 | } | |
465 | ||
466 | ltt_lock_traces(); | |
467 | trace = _ltt_trace_find(trace_name); | |
468 | ltt_unlock_traces(); | |
469 | ||
e9b58dc0 | 470 | if (trace == NULL) { |
204141ee PMF |
471 | ERR("cannot find trace!"); |
472 | retval = -1; | |
473 | goto free_short_chan_name; | |
474 | } | |
475 | ||
e9b58dc0 | 476 | for (i=0; i<trace->nr_channels; i++) { |
204141ee PMF |
477 | struct ust_channel *channel = &trace->channels[i]; |
478 | ||
e9b58dc0 | 479 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
204141ee PMF |
480 | char *reply; |
481 | ||
482 | DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size); | |
08b8805e DG |
483 | if (asprintf(&reply, "%zd", channel->subbuf_size) < 0) { |
484 | ERR("do_cmd_get_subbuf_size : asprintf failed (%zd)", | |
485 | channel->subbuf_size); | |
486 | retval = -1; | |
487 | goto free_short_chan_name; | |
488 | } | |
204141ee PMF |
489 | |
490 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
e9b58dc0 | 491 | if (result) { |
27e84572 | 492 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
493 | free(reply); |
494 | retval = -1; | |
495 | goto free_short_chan_name; | |
496 | } | |
497 | ||
498 | free(reply); | |
499 | found = 1; | |
500 | break; | |
501 | } | |
502 | } | |
e9b58dc0 | 503 | if (found == 0) { |
27e84572 | 504 | ERR("unable to find channel"); |
204141ee PMF |
505 | } |
506 | ||
507 | free_short_chan_name: | |
508 | free(ch_name); | |
509 | ||
510 | end: | |
511 | return retval; | |
512 | } | |
513 | ||
a80e6dd8 | 514 | /* Return the power of two which is equal or higher to v */ |
763f41e5 | 515 | |
a80e6dd8 PMF |
516 | static unsigned int pow2_higher_or_eq(unsigned int v) |
517 | { | |
518 | int hb = fls(v); | |
a80e6dd8 PMF |
519 | int retval = 1<<(hb-1); |
520 | ||
e9b58dc0 | 521 | if (v-retval == 0) |
a80e6dd8 PMF |
522 | return retval; |
523 | else | |
524 | return retval<<1; | |
763f41e5 DS |
525 | } |
526 | ||
527 | static int do_cmd_set_subbuf_size(const char *recvbuf, struct ustcomm_source *src) | |
528 | { | |
529 | char *channel_slash_size; | |
c5ff938a | 530 | char *ch_name = NULL; |
763f41e5 DS |
531 | unsigned int size, power; |
532 | int retval = 0; | |
533 | struct ust_trace *trace; | |
534 | char trace_name[] = "auto"; | |
535 | int i; | |
536 | int found = 0; | |
537 | ||
538 | DBG("set_subbuf_size"); | |
539 | ||
540 | channel_slash_size = nth_token(recvbuf, 1); | |
c5ff938a | 541 | sscanf(channel_slash_size, "%a[^/]/%u", &ch_name, &size); |
763f41e5 | 542 | |
e9b58dc0 | 543 | if (ch_name == NULL) { |
763f41e5 | 544 | ERR("cannot parse channel"); |
5624d402 | 545 | retval = -1; |
763f41e5 DS |
546 | goto end; |
547 | } | |
548 | ||
a80e6dd8 PMF |
549 | power = pow2_higher_or_eq(size); |
550 | power = max_t(unsigned int, 2u, power); | |
763f41e5 | 551 | if (power != size) |
a80e6dd8 | 552 | WARN("using the next power of two for buffer size = %u\n", power); |
763f41e5 DS |
553 | |
554 | ltt_lock_traces(); | |
555 | trace = _ltt_trace_find_setup(trace_name); | |
e9b58dc0 | 556 | if (trace == NULL) { |
763f41e5 | 557 | ERR("cannot find trace!"); |
763f41e5 DS |
558 | retval = -1; |
559 | goto end; | |
560 | } | |
561 | ||
e9b58dc0 | 562 | for (i = 0; i < trace->nr_channels; i++) { |
763f41e5 DS |
563 | struct ust_channel *channel = &trace->channels[i]; |
564 | ||
e9b58dc0 | 565 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
763f41e5 DS |
566 | |
567 | channel->subbuf_size = power; | |
568 | DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size); | |
569 | ||
570 | found = 1; | |
571 | break; | |
572 | } | |
573 | } | |
e9b58dc0 | 574 | if (found == 0) { |
763f41e5 DS |
575 | ERR("unable to find channel"); |
576 | } | |
577 | ||
763f41e5 | 578 | end: |
86dd0ebc | 579 | ltt_unlock_traces(); |
c5ff938a | 580 | free(ch_name); |
763f41e5 DS |
581 | return retval; |
582 | } | |
583 | ||
584 | static int do_cmd_set_subbuf_num(const char *recvbuf, struct ustcomm_source *src) | |
585 | { | |
586 | char *channel_slash_num; | |
c5ff938a | 587 | char *ch_name = NULL; |
763f41e5 DS |
588 | unsigned int num; |
589 | int retval = 0; | |
590 | struct ust_trace *trace; | |
591 | char trace_name[] = "auto"; | |
592 | int i; | |
593 | int found = 0; | |
594 | ||
595 | DBG("set_subbuf_num"); | |
596 | ||
597 | channel_slash_num = nth_token(recvbuf, 1); | |
c5ff938a | 598 | sscanf(channel_slash_num, "%a[^/]/%u", &ch_name, &num); |
763f41e5 | 599 | |
e9b58dc0 | 600 | if (ch_name == NULL) { |
763f41e5 | 601 | ERR("cannot parse channel"); |
5624d402 | 602 | retval = -1; |
763f41e5 DS |
603 | goto end; |
604 | } | |
605 | if (num < 2) { | |
606 | ERR("subbuffer count should be greater than 2"); | |
5624d402 | 607 | retval = -1; |
763f41e5 DS |
608 | goto end; |
609 | } | |
610 | ||
611 | ltt_lock_traces(); | |
612 | trace = _ltt_trace_find_setup(trace_name); | |
e9b58dc0 | 613 | if (trace == NULL) { |
763f41e5 | 614 | ERR("cannot find trace!"); |
763f41e5 DS |
615 | retval = -1; |
616 | goto end; | |
617 | } | |
618 | ||
e9b58dc0 | 619 | for (i = 0; i < trace->nr_channels; i++) { |
763f41e5 DS |
620 | struct ust_channel *channel = &trace->channels[i]; |
621 | ||
e9b58dc0 | 622 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
763f41e5 DS |
623 | |
624 | channel->subbuf_cnt = num; | |
625 | DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt); | |
626 | ||
627 | found = 1; | |
628 | break; | |
629 | } | |
630 | } | |
e9b58dc0 | 631 | if (found == 0) { |
763f41e5 DS |
632 | ERR("unable to find channel"); |
633 | } | |
634 | ||
763f41e5 | 635 | end: |
86dd0ebc | 636 | ltt_unlock_traces(); |
c5ff938a | 637 | free(ch_name); |
763f41e5 DS |
638 | return retval; |
639 | } | |
640 | ||
204141ee PMF |
641 | static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src) |
642 | { | |
643 | int retval = 0; | |
b73a4c47 | 644 | struct ust_trace *trace; |
204141ee PMF |
645 | char trace_name[] = "auto"; |
646 | int i; | |
647 | char *channel_and_cpu; | |
648 | int found = 0; | |
649 | char *ch_name; | |
650 | int ch_cpu; | |
651 | ||
652 | DBG("get_subbuf"); | |
653 | ||
654 | channel_and_cpu = nth_token(recvbuf, 1); | |
e9b58dc0 | 655 | if (channel_and_cpu == NULL) { |
27e84572 | 656 | ERR("cannot parse channel"); |
5624d402 | 657 | retval = -1; |
204141ee PMF |
658 | goto end; |
659 | } | |
660 | ||
661 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
e9b58dc0 | 662 | if (ch_cpu == -1) { |
27e84572 | 663 | ERR("problem parsing channel name"); |
5624d402 | 664 | retval = -1; |
204141ee PMF |
665 | goto free_short_chan_name; |
666 | } | |
667 | ||
668 | ltt_lock_traces(); | |
669 | trace = _ltt_trace_find(trace_name); | |
204141ee | 670 | |
e9b58dc0 | 671 | if (trace == NULL) { |
2ddb81a8 PMF |
672 | int result; |
673 | ||
753e1b51 | 674 | DBG("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 675 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
e9b58dc0 | 676 | if (result) { |
2ddb81a8 | 677 | ERR("ustcomm_send_reply failed"); |
2ddb81a8 | 678 | retval = -1; |
86dd0ebc | 679 | goto unlock_traces; |
2ddb81a8 PMF |
680 | } |
681 | ||
86dd0ebc | 682 | goto unlock_traces; |
204141ee PMF |
683 | } |
684 | ||
e9b58dc0 | 685 | for (i=0; i<trace->nr_channels; i++) { |
204141ee PMF |
686 | struct ust_channel *channel = &trace->channels[i]; |
687 | ||
e9b58dc0 | 688 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
204141ee PMF |
689 | struct ust_buffer *buf = channel->buf[ch_cpu]; |
690 | struct blocked_consumer *bc; | |
691 | ||
692 | found = 1; | |
693 | ||
1dba3e6c | 694 | bc = (struct blocked_consumer *) zmalloc(sizeof(struct blocked_consumer)); |
e9b58dc0 | 695 | if (bc == NULL) { |
1dba3e6c | 696 | ERR("zmalloc returned NULL"); |
86dd0ebc | 697 | goto unlock_traces; |
204141ee PMF |
698 | } |
699 | bc->fd_consumer = src->fd; | |
700 | bc->fd_producer = buf->data_ready_fd_read; | |
701 | bc->buf = buf; | |
702 | bc->src = *src; | |
703 | bc->server = ustcomm_app.server; | |
704 | ||
705 | list_add(&bc->list, &blocked_consumers); | |
706 | ||
d5adede0 PMF |
707 | /* Being here is the proof the daemon has mapped the buffer in its |
708 | * memory. We may now decrement buffers_to_export. | |
709 | */ | |
e9b58dc0 | 710 | if (uatomic_read(&buf->consumed) == 0) { |
d5adede0 | 711 | DBG("decrementing buffers_to_export"); |
8649cd59 | 712 | STORE_SHARED(buffers_to_export, LOAD_SHARED(buffers_to_export)-1); |
d5adede0 PMF |
713 | } |
714 | ||
204141ee PMF |
715 | break; |
716 | } | |
717 | } | |
e9b58dc0 | 718 | if (found == 0) { |
27e84572 | 719 | ERR("unable to find channel"); |
204141ee PMF |
720 | } |
721 | ||
86dd0ebc PMF |
722 | unlock_traces: |
723 | ltt_unlock_traces(); | |
724 | ||
204141ee PMF |
725 | free_short_chan_name: |
726 | free(ch_name); | |
727 | ||
728 | end: | |
729 | return retval; | |
730 | } | |
731 | ||
732 | static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src) | |
733 | { | |
734 | int retval = 0; | |
b73a4c47 | 735 | struct ust_trace *trace; |
204141ee PMF |
736 | char trace_name[] = "auto"; |
737 | int i; | |
738 | char *channel_and_cpu; | |
739 | int found = 0; | |
740 | int result; | |
741 | char *ch_name; | |
742 | int ch_cpu; | |
743 | long consumed_old; | |
744 | char *consumed_old_str; | |
745 | char *endptr; | |
2ddb81a8 | 746 | char *reply = NULL; |
204141ee PMF |
747 | |
748 | DBG("put_subbuf"); | |
749 | ||
ce2ccc12 | 750 | channel_and_cpu = strdup(nth_token(recvbuf, 1)); |
e9b58dc0 | 751 | if (channel_and_cpu == NULL) { |
27e84572 | 752 | ERR("cannot parse channel"); |
204141ee PMF |
753 | retval = -1; |
754 | goto end; | |
755 | } | |
756 | ||
ce2ccc12 | 757 | consumed_old_str = strdup(nth_token(recvbuf, 2)); |
e9b58dc0 | 758 | if (consumed_old_str == NULL) { |
27e84572 | 759 | ERR("cannot parse consumed_old"); |
204141ee PMF |
760 | retval = -1; |
761 | goto free_channel_and_cpu; | |
762 | } | |
763 | consumed_old = strtol(consumed_old_str, &endptr, 10); | |
e9b58dc0 | 764 | if (*endptr != '\0') { |
27e84572 | 765 | ERR("invalid value for consumed_old"); |
204141ee PMF |
766 | retval = -1; |
767 | goto free_consumed_old_str; | |
768 | } | |
769 | ||
770 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); | |
e9b58dc0 | 771 | if (ch_cpu == -1) { |
27e84572 | 772 | ERR("problem parsing channel name"); |
204141ee PMF |
773 | retval = -1; |
774 | goto free_short_chan_name; | |
775 | } | |
776 | ||
777 | ltt_lock_traces(); | |
778 | trace = _ltt_trace_find(trace_name); | |
204141ee | 779 | |
e9b58dc0 | 780 | if (trace == NULL) { |
753e1b51 | 781 | DBG("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 782 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
e9b58dc0 | 783 | if (result) { |
2ddb81a8 | 784 | ERR("ustcomm_send_reply failed"); |
2ddb81a8 | 785 | retval = -1; |
86dd0ebc | 786 | goto unlock_traces; |
2ddb81a8 PMF |
787 | } |
788 | ||
86dd0ebc | 789 | goto unlock_traces; |
204141ee PMF |
790 | } |
791 | ||
e9b58dc0 | 792 | for (i=0; i<trace->nr_channels; i++) { |
204141ee PMF |
793 | struct ust_channel *channel = &trace->channels[i]; |
794 | ||
e9b58dc0 | 795 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
204141ee | 796 | struct ust_buffer *buf = channel->buf[ch_cpu]; |
204141ee PMF |
797 | |
798 | found = 1; | |
799 | ||
b73a4c47 | 800 | result = ust_buffers_put_subbuf(buf, consumed_old); |
e9b58dc0 | 801 | if (result < 0) { |
b73a4c47 | 802 | WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu); |
08b8805e DG |
803 | if (asprintf(&reply, "%s", "ERROR") < 0) { |
804 | ERR("do_cmd_put_subbuffer : asprintf failed (ERROR)"); | |
805 | retval = -1; | |
806 | goto unlock_traces; | |
807 | } | |
e9b58dc0 | 808 | } else { |
b73a4c47 | 809 | DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu); |
08b8805e DG |
810 | if (asprintf(&reply, "%s", "OK") < 0) { |
811 | ERR("do_cmd_put_subbuffer : asprintf failed (OK)"); | |
812 | retval = -1; | |
813 | goto unlock_traces; | |
814 | } | |
204141ee PMF |
815 | } |
816 | ||
817 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); | |
e9b58dc0 | 818 | if (result) { |
27e84572 | 819 | ERR("ustcomm_send_reply failed"); |
204141ee PMF |
820 | free(reply); |
821 | retval = -1; | |
86dd0ebc | 822 | goto unlock_traces; |
204141ee PMF |
823 | } |
824 | ||
825 | free(reply); | |
826 | break; | |
827 | } | |
828 | } | |
e9b58dc0 | 829 | if (found == 0) { |
2ddb81a8 | 830 | ERR("unable to find channel"); |
204141ee PMF |
831 | } |
832 | ||
86dd0ebc PMF |
833 | unlock_traces: |
834 | ltt_unlock_traces(); | |
204141ee PMF |
835 | free_short_chan_name: |
836 | free(ch_name); | |
2ddb81a8 PMF |
837 | free_consumed_old_str: |
838 | free(consumed_old_str); | |
839 | free_channel_and_cpu: | |
840 | free(channel_and_cpu); | |
204141ee PMF |
841 | |
842 | end: | |
843 | return retval; | |
844 | } | |
845 | ||
fc253ce0 PMF |
846 | static void listener_cleanup(void *ptr) |
847 | { | |
848 | ustcomm_fini_app(&ustcomm_app, 0); | |
849 | } | |
850 | ||
b9318b35 AH |
851 | static void do_cmd_force_switch() |
852 | { | |
853 | struct blocked_consumer *bc; | |
854 | ||
855 | list_for_each_entry(bc, &blocked_consumers, list) { | |
856 | ltt_force_switch(bc->buf, FORCE_FLUSH); | |
857 | } | |
858 | } | |
859 | ||
0e4b45ac | 860 | int process_client_cmd(char *recvbuf, struct ustcomm_source *src) |
98963de4 PMF |
861 | { |
862 | int result; | |
0e4b45ac PMF |
863 | char trace_name[] = "auto"; |
864 | char trace_type[] = "ustrelay"; | |
865 | int len; | |
98963de4 | 866 | |
0e4b45ac PMF |
867 | DBG("received a message! it's: %s", recvbuf); |
868 | len = strlen(recvbuf); | |
b0540e11 | 869 | |
e9b58dc0 | 870 | if (!strcmp(recvbuf, "print_markers")) { |
0e4b45ac | 871 | print_markers(stderr); |
e9b58dc0 | 872 | } else if (!strcmp(recvbuf, "list_markers")) { |
0e4b45ac PMF |
873 | char *ptr; |
874 | size_t size; | |
875 | FILE *fp; | |
fc253ce0 | 876 | |
0e4b45ac PMF |
877 | fp = open_memstream(&ptr, &size); |
878 | print_markers(fp); | |
879 | fclose(fp); | |
98963de4 | 880 | |
0e4b45ac | 881 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, src); |
3a7b90de | 882 | |
0e4b45ac | 883 | free(ptr); |
a3adfb05 NC |
884 | } else if (!strcmp(recvbuf, "print_trace_events")) { |
885 | print_trace_events(stderr); | |
886 | ||
e9b58dc0 | 887 | } else if (!strcmp(recvbuf, "list_trace_events")) { |
a3adfb05 NC |
888 | char *ptr; |
889 | size_t size; | |
890 | FILE *fp; | |
891 | ||
892 | fp = open_memstream(&ptr, &size); | |
893 | if (fp == NULL) { | |
894 | ERR("opening memstream failed"); | |
895 | return -1; | |
896 | } | |
897 | print_trace_events(fp); | |
898 | fclose(fp); | |
899 | ||
900 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, src); | |
901 | if (result < 0) { | |
902 | ERR("list_trace_events failed"); | |
903 | return -1; | |
904 | } | |
905 | free(ptr); | |
e9b58dc0 | 906 | } else if (!strcmp(recvbuf, "start")) { |
0e4b45ac PMF |
907 | /* start is an operation that setups the trace, allocates it and starts it */ |
908 | result = ltt_trace_setup(trace_name); | |
e9b58dc0 | 909 | if (result < 0) { |
0e4b45ac PMF |
910 | ERR("ltt_trace_setup failed"); |
911 | return -1; | |
3a7b90de | 912 | } |
98963de4 | 913 | |
0e4b45ac | 914 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 915 | if (result < 0) { |
0e4b45ac PMF |
916 | ERR("ltt_trace_set_type failed"); |
917 | return -1; | |
52c51a47 | 918 | } |
52c51a47 | 919 | |
0e4b45ac | 920 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 921 | if (result < 0) { |
0e4b45ac PMF |
922 | ERR("ltt_trace_alloc failed"); |
923 | return -1; | |
52c51a47 | 924 | } |
52c51a47 | 925 | |
0e4b45ac | 926 | inform_consumer_daemon(trace_name); |
52c51a47 | 927 | |
0e4b45ac | 928 | result = ltt_trace_start(trace_name); |
e9b58dc0 | 929 | if (result < 0) { |
0e4b45ac PMF |
930 | ERR("ltt_trace_start failed"); |
931 | return -1; | |
d0b5f2b9 | 932 | } |
e9b58dc0 | 933 | } else if (!strcmp(recvbuf, "trace_setup")) { |
0e4b45ac | 934 | DBG("trace setup"); |
d0b5f2b9 | 935 | |
0e4b45ac | 936 | result = ltt_trace_setup(trace_name); |
e9b58dc0 | 937 | if (result < 0) { |
0e4b45ac PMF |
938 | ERR("ltt_trace_setup failed"); |
939 | return -1; | |
d0b5f2b9 | 940 | } |
d0b5f2b9 | 941 | |
0e4b45ac | 942 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 943 | if (result < 0) { |
0e4b45ac PMF |
944 | ERR("ltt_trace_set_type failed"); |
945 | return -1; | |
d0b5f2b9 | 946 | } |
e9b58dc0 | 947 | } else if (!strcmp(recvbuf, "trace_alloc")) { |
0e4b45ac | 948 | DBG("trace alloc"); |
62ec620f | 949 | |
0e4b45ac | 950 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 951 | if (result < 0) { |
0e4b45ac PMF |
952 | ERR("ltt_trace_alloc failed"); |
953 | return -1; | |
763f41e5 | 954 | } |
0e4b45ac | 955 | inform_consumer_daemon(trace_name); |
e9b58dc0 | 956 | } else if (!strcmp(recvbuf, "trace_create")) { |
0e4b45ac | 957 | DBG("trace create"); |
d0b5f2b9 | 958 | |
0e4b45ac | 959 | result = ltt_trace_setup(trace_name); |
e9b58dc0 | 960 | if (result < 0) { |
0e4b45ac PMF |
961 | ERR("ltt_trace_setup failed"); |
962 | return -1; | |
d0b5f2b9 | 963 | } |
d0b5f2b9 | 964 | |
0e4b45ac | 965 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 966 | if (result < 0) { |
0e4b45ac PMF |
967 | ERR("ltt_trace_set_type failed"); |
968 | return -1; | |
d0b5f2b9 | 969 | } |
e9b58dc0 | 970 | } else if (!strcmp(recvbuf, "trace_start")) { |
0e4b45ac | 971 | DBG("trace start"); |
aafb1650 | 972 | |
0e4b45ac | 973 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 974 | if (result < 0) { |
0e4b45ac PMF |
975 | ERR("ltt_trace_alloc failed"); |
976 | return -1; | |
811e4b93 | 977 | } |
e9b58dc0 | 978 | if (!result) { |
0e4b45ac | 979 | inform_consumer_daemon(trace_name); |
811e4b93 | 980 | } |
0e4b45ac PMF |
981 | |
982 | result = ltt_trace_start(trace_name); | |
e9b58dc0 | 983 | if (result < 0) { |
0e4b45ac PMF |
984 | ERR("ltt_trace_start failed"); |
985 | return -1; | |
3847c3ba | 986 | } |
e9b58dc0 | 987 | } else if (!strcmp(recvbuf, "trace_stop")) { |
0e4b45ac | 988 | DBG("trace stop"); |
b02e31e5 | 989 | |
0e4b45ac | 990 | result = ltt_trace_stop(trace_name); |
e9b58dc0 | 991 | if (result < 0) { |
0e4b45ac PMF |
992 | ERR("ltt_trace_stop failed"); |
993 | return -1; | |
994 | } | |
e9b58dc0 | 995 | } else if (!strcmp(recvbuf, "trace_destroy")) { |
b02e31e5 | 996 | |
0e4b45ac | 997 | DBG("trace destroy"); |
204141ee | 998 | |
0e4b45ac | 999 | result = ltt_trace_destroy(trace_name, 0); |
e9b58dc0 | 1000 | if (result < 0) { |
0e4b45ac PMF |
1001 | ERR("ltt_trace_destroy failed"); |
1002 | return -1; | |
763f41e5 | 1003 | } |
e9b58dc0 | 1004 | } else if (nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
0e4b45ac | 1005 | do_cmd_get_shmid(recvbuf, src); |
e9b58dc0 | 1006 | } else if (nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { |
0e4b45ac | 1007 | do_cmd_get_n_subbufs(recvbuf, src); |
e9b58dc0 | 1008 | } else if (nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { |
0e4b45ac | 1009 | do_cmd_get_subbuf_size(recvbuf, src); |
e9b58dc0 | 1010 | } else if (nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
0e4b45ac | 1011 | char *libfile; |
52c51a47 | 1012 | |
0e4b45ac | 1013 | libfile = nth_token(recvbuf, 1); |
52c51a47 | 1014 | |
0e4b45ac | 1015 | DBG("load_probe_lib loading %s", libfile); |
52c51a47 | 1016 | |
0e4b45ac | 1017 | free(libfile); |
e9b58dc0 | 1018 | } else if (nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
0e4b45ac | 1019 | do_cmd_get_subbuffer(recvbuf, src); |
e9b58dc0 | 1020 | } else if (nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { |
0e4b45ac | 1021 | do_cmd_put_subbuffer(recvbuf, src); |
e9b58dc0 | 1022 | } else if (nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) { |
0e4b45ac | 1023 | do_cmd_set_subbuf_size(recvbuf, src); |
e9b58dc0 | 1024 | } else if (nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) { |
0e4b45ac | 1025 | do_cmd_set_subbuf_num(recvbuf, src); |
e9b58dc0 | 1026 | } else if (nth_token_is(recvbuf, "enable_marker", 0) == 1) { |
0e4b45ac | 1027 | char *channel_slash_name = nth_token(recvbuf, 1); |
c5ff938a DS |
1028 | char *channel_name = NULL; |
1029 | char *marker_name = NULL; | |
0e4b45ac | 1030 | |
c5ff938a | 1031 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); |
0e4b45ac | 1032 | |
e9b58dc0 | 1033 | if (channel_name == NULL || marker_name == NULL) { |
0e4b45ac | 1034 | WARN("invalid marker name"); |
c5ff938a DS |
1035 | free(channel_name); |
1036 | free(marker_name); | |
0e4b45ac | 1037 | goto next_cmd; |
52c51a47 | 1038 | } |
52c51a47 | 1039 | |
0e4b45ac | 1040 | result = ltt_marker_connect(channel_name, marker_name, "default"); |
e9b58dc0 | 1041 | if (result < 0) { |
0e4b45ac PMF |
1042 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); |
1043 | } | |
c5ff938a DS |
1044 | |
1045 | free(channel_name); | |
1046 | free(marker_name); | |
e9b58dc0 | 1047 | } else if (nth_token_is(recvbuf, "disable_marker", 0) == 1) { |
0e4b45ac | 1048 | char *channel_slash_name = nth_token(recvbuf, 1); |
c5ff938a DS |
1049 | char *marker_name = NULL; |
1050 | char *channel_name = NULL; | |
52c51a47 | 1051 | |
0e4b45ac | 1052 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); |
52c51a47 | 1053 | |
e9b58dc0 | 1054 | if (channel_name == NULL || marker_name == NULL) { |
b17081c0 | 1055 | WARN("invalid marker name"); |
c5ff938a DS |
1056 | free(channel_name); |
1057 | free(marker_name); | |
b17081c0 | 1058 | goto next_cmd; |
52c51a47 | 1059 | } |
ed1317e7 | 1060 | |
0e4b45ac | 1061 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); |
e9b58dc0 | 1062 | if (result < 0) { |
0e4b45ac PMF |
1063 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); |
1064 | } | |
c5ff938a DS |
1065 | |
1066 | free(channel_name); | |
1067 | free(marker_name); | |
e9b58dc0 | 1068 | } else if (nth_token_is(recvbuf, "get_pidunique", 0) == 1) { |
0e4b45ac | 1069 | char *reply; |
ed1317e7 | 1070 | |
08b8805e DG |
1071 | if (asprintf(&reply, "%lld", pidunique) < 0) { |
1072 | ERR("process_client_cmd : asprintf failed (%lld)", | |
1073 | pidunique); | |
1074 | goto next_cmd; | |
1075 | } | |
ed1317e7 | 1076 | |
0e4b45ac | 1077 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
e9b58dc0 | 1078 | if (result) { |
0e4b45ac PMF |
1079 | ERR("listener: get_pidunique: ustcomm_send_reply failed"); |
1080 | goto next_cmd; | |
ed1317e7 | 1081 | } |
0e4b45ac PMF |
1082 | |
1083 | free(reply); | |
e9b58dc0 | 1084 | } else if (nth_token_is(recvbuf, "get_sock_path", 0) == 1) { |
b2fb2f91 | 1085 | char *reply = getenv("UST_DAEMON_SOCKET"); |
e9b58dc0 | 1086 | if (!reply) { |
08b8805e DG |
1087 | if (asprintf(&reply, "%s/%s", SOCK_DIR, "ustd") < 0) { |
1088 | ERR("process_client_cmd : asprintf failed (%s/ustd)", | |
1089 | SOCK_DIR); | |
1090 | goto next_cmd; | |
1091 | } | |
b2fb2f91 AH |
1092 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
1093 | free(reply); | |
e9b58dc0 | 1094 | } else { |
b2fb2f91 AH |
1095 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
1096 | } | |
e9b58dc0 | 1097 | if (result) |
b2fb2f91 | 1098 | ERR("ustcomm_send_reply failed"); |
e9b58dc0 | 1099 | } else if (nth_token_is(recvbuf, "set_sock_path", 0) == 1) { |
b2fb2f91 AH |
1100 | char *sock_path = nth_token(recvbuf, 1); |
1101 | result = setenv("UST_DAEMON_SOCKET", sock_path, 1); | |
e9b58dc0 | 1102 | if (result) |
b2fb2f91 | 1103 | ERR("cannot set UST_DAEMON_SOCKET environment variable"); |
e9b58dc0 | 1104 | } else if (nth_token_is(recvbuf, "force_switch", 0) == 1) { |
b9318b35 | 1105 | do_cmd_force_switch(); |
e9b58dc0 | 1106 | } else { |
0e4b45ac PMF |
1107 | ERR("unable to parse message: %s", recvbuf); |
1108 | } | |
1109 | ||
1110 | next_cmd: | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | void *listener_main(void *p) | |
1116 | { | |
1117 | int result; | |
1118 | ||
1119 | DBG("LISTENER"); | |
1120 | ||
1121 | pthread_cleanup_push(listener_cleanup, NULL); | |
1122 | ||
e9b58dc0 | 1123 | for (;;) { |
0e4b45ac PMF |
1124 | struct mpentries mpent; |
1125 | ||
1126 | multipoll_init(&mpent); | |
1127 | ||
1128 | blocked_consumers_add_to_mp(&mpent); | |
1129 | ustcomm_mp_add_app_clients(&mpent, &ustcomm_app, process_client_cmd); | |
1130 | ||
1131 | result = multipoll_poll(&mpent, -1); | |
e9b58dc0 | 1132 | if (result == -1) { |
0e4b45ac | 1133 | ERR("error in multipoll_poll"); |
688760ef | 1134 | } |
d0b5f2b9 | 1135 | |
0e4b45ac | 1136 | multipoll_destroy(&mpent); |
98963de4 | 1137 | } |
fc253ce0 PMF |
1138 | |
1139 | pthread_cleanup_pop(1); | |
98963de4 PMF |
1140 | } |
1141 | ||
cd03ff7f PMF |
1142 | /* These should only be accessed in the parent thread, |
1143 | * not the listener. | |
1144 | */ | |
ce45335c | 1145 | static volatile sig_atomic_t have_listener = 0; |
fc253ce0 | 1146 | static pthread_t listener_thread; |
4440ebcb | 1147 | |
98963de4 PMF |
1148 | void create_listener(void) |
1149 | { | |
c5fdc888 | 1150 | int result; |
f51d84ea PMF |
1151 | sigset_t sig_all_blocked; |
1152 | sigset_t orig_parent_mask; | |
98963de4 | 1153 | |
e9b58dc0 | 1154 | if (have_listener) { |
c5fdc888 | 1155 | WARN("not creating listener because we already had one"); |
4440ebcb | 1156 | return; |
c5fdc888 | 1157 | } |
4440ebcb | 1158 | |
f51d84ea PMF |
1159 | /* A new thread created by pthread_create inherits the signal mask |
1160 | * from the parent. To avoid any signal being received by the | |
1161 | * listener thread, we block all signals temporarily in the parent, | |
1162 | * while we create the listener thread. | |
1163 | */ | |
1164 | ||
1165 | sigfillset(&sig_all_blocked); | |
1166 | ||
1167 | result = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_parent_mask); | |
e9b58dc0 | 1168 | if (result) { |
f51d84ea PMF |
1169 | PERROR("pthread_sigmask: %s", strerror(result)); |
1170 | } | |
1171 | ||
cd03ff7f | 1172 | result = pthread_create(&listener_thread, NULL, listener_main, NULL); |
e9b58dc0 | 1173 | if (result == -1) { |
cd03ff7f | 1174 | PERROR("pthread_create"); |
98963de4 | 1175 | } |
4440ebcb | 1176 | |
f51d84ea PMF |
1177 | /* Restore original signal mask in parent */ |
1178 | result = pthread_sigmask(SIG_SETMASK, &orig_parent_mask, NULL); | |
e9b58dc0 | 1179 | if (result) { |
f51d84ea | 1180 | PERROR("pthread_sigmask: %s", strerror(result)); |
e9b58dc0 | 1181 | } else { |
4267e589 PMF |
1182 | have_listener = 1; |
1183 | } | |
98963de4 PMF |
1184 | } |
1185 | ||
98963de4 | 1186 | static int init_socket(void) |
68c1021b | 1187 | { |
d0b5f2b9 | 1188 | return ustcomm_init_app(getpid(), &ustcomm_app); |
68c1021b PMF |
1189 | } |
1190 | ||
5de74e51 PMF |
1191 | #define AUTOPROBE_DISABLED 0 |
1192 | #define AUTOPROBE_ENABLE_ALL 1 | |
1193 | #define AUTOPROBE_ENABLE_REGEX 2 | |
1194 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
1195 | static regex_t autoprobe_regex; | |
ef290fca | 1196 | |
20b37a31 | 1197 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
1198 | { |
1199 | int result; | |
1200 | ||
5de74e51 PMF |
1201 | char* concat_name = NULL; |
1202 | const char *probe_name = "default"; | |
ef290fca | 1203 | |
e9b58dc0 | 1204 | if (autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca | 1205 | return; |
e9b58dc0 | 1206 | } else if (autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
5de74e51 | 1207 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); |
e9b58dc0 | 1208 | if (result == -1) { |
5de74e51 PMF |
1209 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", |
1210 | m->channel, m->name); | |
1211 | return; | |
1212 | } | |
1213 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
1214 | free(concat_name); | |
1215 | return; | |
1216 | } | |
1217 | free(concat_name); | |
ef290fca PMF |
1218 | } |
1219 | ||
5de74e51 | 1220 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
e9b58dc0 | 1221 | if (result && result != -EEXIST) |
acbf228b | 1222 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); |
20b37a31 | 1223 | |
3ea1e2fc | 1224 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
ef290fca | 1225 | |
20b37a31 PMF |
1226 | } |
1227 | ||
c1083aa8 | 1228 | static void __attribute__((constructor)) init() |
20b37a31 PMF |
1229 | { |
1230 | int result; | |
5de74e51 | 1231 | char* autoprobe_val = NULL; |
223f2e7c AH |
1232 | char* subbuffer_size_val = NULL; |
1233 | char* subbuffer_count_val = NULL; | |
1234 | unsigned int subbuffer_size; | |
1235 | unsigned int subbuffer_count; | |
1236 | unsigned int power; | |
20b37a31 | 1237 | |
ed1317e7 PMF |
1238 | /* Assign the pidunique, to be able to differentiate the processes with same |
1239 | * pid, (before and after an exec). | |
1240 | */ | |
1241 | pidunique = make_pidunique(); | |
1242 | ||
5de74e51 | 1243 | DBG("Tracectl constructor"); |
20b37a31 | 1244 | |
3847c3ba | 1245 | result = init_socket(); |
e9b58dc0 | 1246 | if (result == -1) { |
3847c3ba PMF |
1247 | ERR("init_socket error"); |
1248 | return; | |
1249 | } | |
2944a629 PMF |
1250 | |
1251 | create_listener(); | |
68c1021b | 1252 | |
5de74e51 | 1253 | autoprobe_val = getenv("UST_AUTOPROBE"); |
e9b58dc0 | 1254 | if (autoprobe_val) { |
4440ebcb PMF |
1255 | struct marker_iter iter; |
1256 | ||
08230db7 | 1257 | DBG("Autoprobe enabled."); |
4440ebcb PMF |
1258 | |
1259 | /* Ensure markers are initialized */ | |
1260 | //init_markers(); | |
1261 | ||
1262 | /* Ensure marker control is initialized, for the probe */ | |
1263 | init_marker_control(); | |
1264 | ||
1265 | /* first, set the callback that will connect the | |
1266 | * probe on new markers | |
1267 | */ | |
e9b58dc0 | 1268 | if (autoprobe_val[0] == '/') { |
5de74e51 PMF |
1269 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); |
1270 | if (result) { | |
1271 | char regexerr[150]; | |
1272 | ||
1273 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
1274 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
1275 | /* don't crash the application just for this */ | |
e9b58dc0 | 1276 | } else { |
5de74e51 PMF |
1277 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; |
1278 | } | |
e9b58dc0 | 1279 | } else { |
5de74e51 PMF |
1280 | /* just enable all instrumentation */ |
1281 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
1282 | } | |
1283 | ||
1284 | marker_set_new_marker_cb(auto_probe_connect); | |
1285 | ||
4440ebcb PMF |
1286 | /* Now, connect the probes that were already registered. */ |
1287 | marker_iter_reset(&iter); | |
1288 | marker_iter_start(&iter); | |
1289 | ||
08230db7 | 1290 | DBG("now iterating on markers already registered"); |
e9b58dc0 | 1291 | while (iter.marker) { |
08230db7 | 1292 | DBG("now iterating on marker %s", iter.marker->name); |
4440ebcb PMF |
1293 | auto_probe_connect(iter.marker); |
1294 | marker_iter_next(&iter); | |
1295 | } | |
1296 | } | |
1297 | ||
e9b58dc0 | 1298 | if (getenv("UST_OVERWRITE")) { |
8649cd59 | 1299 | int val = atoi(getenv("UST_OVERWRITE")); |
e9b58dc0 | 1300 | if (val == 0 || val == 1) { |
8649cd59 | 1301 | STORE_SHARED(ust_channels_overwrite_by_default, val); |
e9b58dc0 | 1302 | } else { |
8649cd59 PMF |
1303 | WARN("invalid value for UST_OVERWRITE"); |
1304 | } | |
1305 | } | |
1306 | ||
e9b58dc0 | 1307 | if (getenv("UST_AUTOCOLLECT")) { |
8649cd59 | 1308 | int val = atoi(getenv("UST_AUTOCOLLECT")); |
e9b58dc0 | 1309 | if (val == 0 || val == 1) { |
8649cd59 | 1310 | STORE_SHARED(ust_channels_request_collection_by_default, val); |
e9b58dc0 | 1311 | } else { |
8649cd59 PMF |
1312 | WARN("invalid value for UST_AUTOCOLLECT"); |
1313 | } | |
1314 | } | |
1315 | ||
223f2e7c | 1316 | subbuffer_size_val = getenv("UST_SUBBUF_SIZE"); |
e9b58dc0 | 1317 | if (subbuffer_size_val) { |
223f2e7c AH |
1318 | sscanf(subbuffer_size_val, "%u", &subbuffer_size); |
1319 | power = pow2_higher_or_eq(subbuffer_size); | |
e9b58dc0 | 1320 | if (power != subbuffer_size) |
223f2e7c AH |
1321 | WARN("using the next power of two for buffer size = %u\n", power); |
1322 | chan_infos[LTT_CHANNEL_UST].def_subbufsize = power; | |
1323 | } | |
1324 | ||
1325 | subbuffer_count_val = getenv("UST_SUBBUF_NUM"); | |
e9b58dc0 | 1326 | if (subbuffer_count_val) { |
223f2e7c | 1327 | sscanf(subbuffer_count_val, "%u", &subbuffer_count); |
e9b58dc0 | 1328 | if (subbuffer_count < 2) |
223f2e7c AH |
1329 | subbuffer_count = 2; |
1330 | chan_infos[LTT_CHANNEL_UST].def_subbufcount = subbuffer_count; | |
1331 | } | |
1332 | ||
e9b58dc0 | 1333 | if (getenv("UST_TRACE")) { |
4db647c5 PMF |
1334 | char trace_name[] = "auto"; |
1335 | char trace_type[] = "ustrelay"; | |
1336 | ||
1337 | DBG("starting early tracing"); | |
1338 | ||
1339 | /* Ensure marker control is initialized */ | |
1340 | init_marker_control(); | |
1341 | ||
4db647c5 PMF |
1342 | /* Ensure markers are initialized */ |
1343 | init_markers(); | |
1344 | ||
e17571a5 PMF |
1345 | /* Ensure buffers are initialized, for the transport to be available. |
1346 | * We are about to set a trace type and it will fail without this. | |
1347 | */ | |
1348 | init_ustrelay_transport(); | |
1349 | ||
027ffc9d PMF |
1350 | /* FIXME: When starting early tracing (here), depending on the |
1351 | * order of constructors, it is very well possible some marker | |
1352 | * sections are not yet registered. Because of this, some | |
1353 | * channels may not be registered. Yet, we are about to ask the | |
1354 | * daemon to collect the channels. Channels which are not yet | |
1355 | * registered will not be collected. | |
1356 | * | |
1357 | * Currently, in LTTng, there is no way to add a channel after | |
1358 | * trace start. The reason for this is that it induces complex | |
1359 | * concurrency issues on the trace structures, which can only | |
1360 | * be resolved using RCU. This has not been done yet. As a | |
1361 | * workaround, we are forcing the registration of the "ust" | |
1362 | * channel here. This is the only channel (apart from metadata) | |
1363 | * that can be reliably used in early tracing. | |
1364 | * | |
1365 | * Non-early tracing does not have this problem and can use | |
1366 | * arbitrary channel names. | |
1367 | */ | |
20b37a31 | 1368 | ltt_channels_register("ust"); |
4db647c5 PMF |
1369 | |
1370 | result = ltt_trace_setup(trace_name); | |
e9b58dc0 | 1371 | if (result < 0) { |
4db647c5 PMF |
1372 | ERR("ltt_trace_setup failed"); |
1373 | return; | |
1374 | } | |
1375 | ||
1376 | result = ltt_trace_set_type(trace_name, trace_type); | |
e9b58dc0 | 1377 | if (result < 0) { |
4db647c5 PMF |
1378 | ERR("ltt_trace_set_type failed"); |
1379 | return; | |
1380 | } | |
1381 | ||
1382 | result = ltt_trace_alloc(trace_name); | |
e9b58dc0 | 1383 | if (result < 0) { |
4db647c5 PMF |
1384 | ERR("ltt_trace_alloc failed"); |
1385 | return; | |
1386 | } | |
1387 | ||
1388 | result = ltt_trace_start(trace_name); | |
e9b58dc0 | 1389 | if (result < 0) { |
4db647c5 PMF |
1390 | ERR("ltt_trace_start failed"); |
1391 | return; | |
1392 | } | |
60e57148 PMF |
1393 | |
1394 | /* Do this after the trace is started in order to avoid creating confusion | |
1395 | * if the trace fails to start. */ | |
1396 | inform_consumer_daemon(trace_name); | |
4db647c5 PMF |
1397 | } |
1398 | ||
68c1021b PMF |
1399 | return; |
1400 | ||
1401 | /* should decrementally destroy stuff if error */ | |
1402 | ||
1403 | } | |
1404 | ||
1405 | /* This is only called if we terminate normally, not with an unhandled signal, | |
6d45c11a PMF |
1406 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
1407 | * the last sub-buffer contain a valid end time for the trace. This is done | |
1408 | * automatically only when the trace is properly stopped. | |
1409 | * | |
1410 | * If the traced program crashed, it is always possible to manually add the | |
1411 | * right value in the header, or to open the trace in text mode. | |
1412 | * | |
1413 | * FIXME: Fix LTTV so it doesn't need this. | |
1414 | */ | |
68c1021b | 1415 | |
6d45c11a | 1416 | static void destroy_traces(void) |
68c1021b | 1417 | { |
6d45c11a | 1418 | int result; |
a584bc4e PMF |
1419 | |
1420 | /* if trace running, finish it */ | |
1421 | ||
6d45c11a | 1422 | DBG("destructor stopping traces"); |
a584bc4e | 1423 | |
6d45c11a | 1424 | result = ltt_trace_stop("auto"); |
e9b58dc0 | 1425 | if (result == -1) { |
6d45c11a PMF |
1426 | ERR("ltt_trace_stop error"); |
1427 | } | |
1428 | ||
31d392f1 | 1429 | result = ltt_trace_destroy("auto", 0); |
e9b58dc0 | 1430 | if (result == -1) { |
6d45c11a PMF |
1431 | ERR("ltt_trace_destroy error"); |
1432 | } | |
68c1021b | 1433 | } |
1e2944cb | 1434 | |
97d9b88b PMF |
1435 | static int trace_recording(void) |
1436 | { | |
1437 | int retval = 0; | |
b73a4c47 | 1438 | struct ust_trace *trace; |
97d9b88b PMF |
1439 | |
1440 | ltt_lock_traces(); | |
1441 | ||
1442 | list_for_each_entry(trace, <t_traces.head, list) { | |
e9b58dc0 | 1443 | if (trace->active) { |
97d9b88b PMF |
1444 | retval = 1; |
1445 | break; | |
1446 | } | |
1447 | } | |
1448 | ||
1449 | ltt_unlock_traces(); | |
1450 | ||
1451 | return retval; | |
1452 | } | |
1453 | ||
f293009f | 1454 | #if 0 |
97d9b88b PMF |
1455 | static int have_consumer(void) |
1456 | { | |
1457 | return !list_empty(&blocked_consumers); | |
1458 | } | |
f293009f | 1459 | #endif |
97d9b88b | 1460 | |
f293009f | 1461 | int restarting_usleep(useconds_t usecs) |
97d9b88b PMF |
1462 | { |
1463 | struct timespec tv; | |
1464 | int result; | |
1465 | ||
f293009f PMF |
1466 | tv.tv_sec = 0; |
1467 | tv.tv_nsec = usecs * 1000; | |
97d9b88b PMF |
1468 | |
1469 | do { | |
e9b58dc0 DS |
1470 | result = nanosleep(&tv, &tv); |
1471 | } while (result == -1 && errno == EINTR); | |
97d9b88b PMF |
1472 | |
1473 | return result; | |
1474 | } | |
1475 | ||
4267e589 | 1476 | static void stop_listener(void) |
fc253ce0 PMF |
1477 | { |
1478 | int result; | |
1479 | ||
e9b58dc0 | 1480 | if (!have_listener) |
4267e589 PMF |
1481 | return; |
1482 | ||
fc253ce0 | 1483 | result = pthread_cancel(listener_thread); |
e9b58dc0 | 1484 | if (result != 0) { |
18cbdbac | 1485 | ERR("pthread_cancel: %s", strerror(result)); |
fc253ce0 PMF |
1486 | } |
1487 | result = pthread_join(listener_thread, NULL); | |
e9b58dc0 | 1488 | if (result != 0) { |
18cbdbac | 1489 | ERR("pthread_join: %s", strerror(result)); |
fc253ce0 PMF |
1490 | } |
1491 | } | |
1492 | ||
f293009f PMF |
1493 | /* This destructor keeps the process alive for a few seconds in order |
1494 | * to leave time to ustd to connect to its buffers. This is necessary | |
1495 | * for programs whose execution is very short. It is also useful in all | |
1496 | * programs when tracing is started close to the end of the program | |
1497 | * execution. | |
1498 | * | |
1499 | * FIXME: For now, this only works for the first trace created in a | |
1500 | * process. | |
1501 | */ | |
1502 | ||
97d9b88b PMF |
1503 | static void __attribute__((destructor)) keepalive() |
1504 | { | |
e9b58dc0 | 1505 | if (trace_recording() && LOAD_SHARED(buffers_to_export)) { |
c472cce0 | 1506 | int total = 0; |
f293009f | 1507 | DBG("Keeping process alive for consumer daemon..."); |
e9b58dc0 | 1508 | while (LOAD_SHARED(buffers_to_export)) { |
f293009f | 1509 | const int interv = 200000; |
c472cce0 | 1510 | restarting_usleep(interv); |
f293009f PMF |
1511 | total += interv; |
1512 | ||
e9b58dc0 | 1513 | if (total >= 3000000) { |
c472cce0 | 1514 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
f293009f PMF |
1515 | break; |
1516 | } | |
1517 | } | |
1518 | DBG("Finally dying..."); | |
1519 | } | |
6d45c11a PMF |
1520 | |
1521 | destroy_traces(); | |
1522 | ||
fc253ce0 PMF |
1523 | /* Ask the listener to stop and clean up. */ |
1524 | stop_listener(); | |
97d9b88b | 1525 | } |
97d9b88b | 1526 | |
775c8a3f | 1527 | void ust_potential_exec(void) |
c396a841 PMF |
1528 | { |
1529 | trace_mark(ust, potential_exec, MARK_NOARGS); | |
1530 | ||
775c8a3f PMF |
1531 | DBG("test"); |
1532 | ||
c396a841 PMF |
1533 | keepalive(); |
1534 | } | |
1535 | ||
1e2944cb PMF |
1536 | /* Notify ust that there was a fork. This needs to be called inside |
1537 | * the new process, anytime a process whose memory is not shared with | |
1538 | * the parent is created. If this function is not called, the events | |
1539 | * of the new process will not be collected. | |
616ed36a PMF |
1540 | * |
1541 | * Signals should be disabled before the fork and reenabled only after | |
1542 | * this call in order to guarantee tracing is not started before ust_fork() | |
1543 | * sanitizes the new process. | |
1e2944cb PMF |
1544 | */ |
1545 | ||
616ed36a | 1546 | static void ust_fork(void) |
1e2944cb | 1547 | { |
99b72dc0 PMF |
1548 | struct blocked_consumer *bc; |
1549 | struct blocked_consumer *deletable_bc = NULL; | |
1550 | int result; | |
1551 | ||
31d392f1 | 1552 | /* FIXME: technically, the locks could have been taken before the fork */ |
1e2944cb | 1553 | DBG("ust: forking"); |
73850001 PMF |
1554 | |
1555 | /* break lock if necessary */ | |
1556 | ltt_unlock_traces(); | |
1557 | ||
1e2944cb | 1558 | ltt_trace_stop("auto"); |
31d392f1 | 1559 | ltt_trace_destroy("auto", 1); |
99b72dc0 PMF |
1560 | /* Delete all active connections */ |
1561 | ustcomm_close_all_connections(&ustcomm_app.server); | |
1562 | ||
1563 | /* Delete all blocked consumers */ | |
1564 | list_for_each_entry(bc, &blocked_consumers, list) { | |
2c1ccefa | 1565 | result = close(bc->fd_producer); |
e9b58dc0 | 1566 | if (result == -1) { |
2c1ccefa PMF |
1567 | PERROR("close"); |
1568 | } | |
99b72dc0 PMF |
1569 | free(deletable_bc); |
1570 | deletable_bc = bc; | |
1571 | list_del(&bc->list); | |
1572 | } | |
1573 | ||
2a79ceeb PMF |
1574 | /* free app, keeping socket file */ |
1575 | ustcomm_fini_app(&ustcomm_app, 1); | |
393bc391 | 1576 | |
8649cd59 | 1577 | STORE_SHARED(buffers_to_export, 0); |
1e2944cb | 1578 | have_listener = 0; |
99b72dc0 | 1579 | init_socket(); |
9fb49d0e | 1580 | create_listener(); |
99b72dc0 PMF |
1581 | ltt_trace_setup("auto"); |
1582 | result = ltt_trace_set_type("auto", "ustrelay"); | |
e9b58dc0 | 1583 | if (result < 0) { |
99b72dc0 | 1584 | ERR("ltt_trace_set_type failed"); |
036db133 | 1585 | return; |
99b72dc0 PMF |
1586 | } |
1587 | ||
1588 | ltt_trace_alloc("auto"); | |
1589 | ltt_trace_start("auto"); | |
ad45e833 | 1590 | inform_consumer_daemon("auto"); |
1e2944cb PMF |
1591 | } |
1592 | ||
616ed36a PMF |
1593 | void ust_before_fork(ust_fork_info_t *fork_info) |
1594 | { | |
1595 | /* Disable signals. This is to avoid that the child | |
1596 | * intervenes before it is properly setup for tracing. It is | |
1597 | * safer to disable all signals, because then we know we are not | |
1598 | * breaking anything by restoring the original mask. | |
1599 | */ | |
1600 | sigset_t all_sigs; | |
1601 | int result; | |
1602 | ||
1603 | /* FIXME: | |
1604 | - only do this if tracing is active | |
1605 | */ | |
1606 | ||
1607 | /* Disable signals */ | |
1608 | sigfillset(&all_sigs); | |
1609 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); | |
e9b58dc0 | 1610 | if (result == -1) { |
616ed36a PMF |
1611 | PERROR("sigprocmask"); |
1612 | return; | |
1613 | } | |
1614 | } | |
1615 | ||
1616 | /* Don't call this function directly in a traced program */ | |
1617 | static void ust_after_fork_common(ust_fork_info_t *fork_info) | |
1618 | { | |
1619 | int result; | |
616ed36a PMF |
1620 | |
1621 | /* Restore signals */ | |
1622 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); | |
e9b58dc0 | 1623 | if (result == -1) { |
616ed36a PMF |
1624 | PERROR("sigprocmask"); |
1625 | return; | |
1626 | } | |
1627 | } | |
1628 | ||
1629 | void ust_after_fork_parent(ust_fork_info_t *fork_info) | |
1630 | { | |
1631 | /* Reenable signals */ | |
1632 | ust_after_fork_common(fork_info); | |
1633 | } | |
1634 | ||
1635 | void ust_after_fork_child(ust_fork_info_t *fork_info) | |
1636 | { | |
1637 | /* First sanitize the child */ | |
1638 | ust_fork(); | |
1639 | ||
1640 | /* Then reenable interrupts */ | |
1641 | ust_after_fork_common(fork_info); | |
1642 | } | |
1643 |