Commit | Line | Data |
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c39c72ee PMF |
1 | /* Copyright (C) 2009 Pierre-Marc Fournier |
2 | * | |
3 | * This library is free software; you can redistribute it and/or | |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public | |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
872037bb | 18 | #define _GNU_SOURCE |
68c1021b PMF |
19 | #include <stdio.h> |
20 | #include <stdint.h> | |
21 | #include <signal.h> | |
22 | #include <sys/types.h> | |
23 | #include <sys/socket.h> | |
24 | #include <sys/un.h> | |
98963de4 | 25 | #include <sched.h> |
a584bc4e | 26 | #include <fcntl.h> |
3a7b90de | 27 | #include <poll.h> |
ef290fca | 28 | #include <regex.h> |
fbd8191b | 29 | |
26cc7017 PMF |
30 | #include <urcu.h> |
31 | ||
fbd8191b | 32 | #include "marker.h" |
a584bc4e | 33 | #include "tracer.h" |
d0b5f2b9 PMF |
34 | #include "localerr.h" |
35 | #include "ustcomm.h" | |
46ef48cd | 36 | #include "relay.h" /* FIXME: remove */ |
9160b4e4 | 37 | #include "marker-control.h" |
fbd8191b | 38 | |
b02e31e5 | 39 | //#define USE_CLONE |
3847c3ba | 40 | |
68c1021b PMF |
41 | #define USTSIGNAL SIGIO |
42 | ||
98963de4 PMF |
43 | #define MAX_MSG_SIZE (100) |
44 | #define MSG_NOTIF 1 | |
45 | #define MSG_REGISTER_NOTIF 2 | |
46 | ||
a584bc4e PMF |
47 | char consumer_stack[10000]; |
48 | ||
3a7b90de PMF |
49 | struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers); |
50 | ||
d0b5f2b9 PMF |
51 | static struct ustcomm_app ustcomm_app; |
52 | ||
68c1021b PMF |
53 | struct tracecmd { /* no padding */ |
54 | uint32_t size; | |
55 | uint16_t command; | |
56 | }; | |
57 | ||
98963de4 PMF |
58 | //struct listener_arg { |
59 | // int pipe_fd; | |
60 | //}; | |
61 | ||
62 | struct trctl_msg { | |
63 | /* size: the size of all the fields except size itself */ | |
64 | uint32_t size; | |
65 | uint16_t type; | |
66 | /* Only the necessary part of the payload is transferred. It | |
67 | * may even be none of it. | |
68 | */ | |
69 | char payload[94]; | |
70 | }; | |
68c1021b | 71 | |
a584bc4e PMF |
72 | struct consumer_channel { |
73 | int fd; | |
74 | struct ltt_channel_struct *chan; | |
75 | }; | |
76 | ||
3a7b90de PMF |
77 | struct blocked_consumer { |
78 | int fd_consumer; | |
79 | int fd_producer; | |
80 | int tmp_poll_idx; | |
81 | ||
82 | /* args to ustcomm_send_reply */ | |
83 | struct ustcomm_server server; | |
84 | struct ustcomm_source src; | |
85 | ||
86 | /* args to ltt_do_get_subbuf */ | |
87 | struct rchan_buf *rbuf; | |
88 | struct ltt_channel_buf_struct *lttbuf; | |
89 | ||
90 | struct list_head list; | |
91 | }; | |
92 | ||
52c51a47 | 93 | static void print_markers(FILE *fp) |
fbd8191b PMF |
94 | { |
95 | struct marker_iter iter; | |
96 | ||
d0b5f2b9 | 97 | lock_markers(); |
fbd8191b PMF |
98 | marker_iter_reset(&iter); |
99 | marker_iter_start(&iter); | |
100 | ||
101 | while(iter.marker) { | |
52c51a47 | 102 | fprintf(fp, "marker: %s_%s %d \"%s\"\n", iter.marker->channel, iter.marker->name, (int)imv_read(iter.marker->state), iter.marker->format); |
fbd8191b PMF |
103 | marker_iter_next(&iter); |
104 | } | |
d0b5f2b9 | 105 | unlock_markers(); |
fbd8191b PMF |
106 | } |
107 | ||
4440ebcb | 108 | static int init_socket(void); |
68c1021b | 109 | |
26cc7017 PMF |
110 | /* This needs to be called whenever a new thread is created. It notifies |
111 | * liburcu of the new thread. | |
112 | */ | |
113 | ||
114 | void ust_register_thread(void) | |
68c1021b | 115 | { |
26cc7017 | 116 | rcu_register_thread(); |
68c1021b PMF |
117 | } |
118 | ||
98963de4 PMF |
119 | int fd_notif = -1; |
120 | void notif_cb(void) | |
121 | { | |
122 | int result; | |
123 | struct trctl_msg msg; | |
124 | ||
125 | /* FIXME: fd_notif should probably be protected by a spinlock */ | |
126 | ||
127 | if(fd_notif == -1) | |
128 | return; | |
129 | ||
130 | msg.type = MSG_NOTIF; | |
131 | msg.size = sizeof(msg.type); | |
132 | ||
133 | /* FIXME: don't block here */ | |
134 | result = write(fd_notif, &msg, msg.size+sizeof(msg.size)); | |
135 | if(result == -1) { | |
136 | PERROR("write"); | |
137 | return; | |
138 | } | |
139 | } | |
140 | ||
ad45e833 PMF |
141 | /* Ask the daemon to collect a trace called trace_name and being |
142 | * produced by this pid. | |
143 | * | |
144 | * The trace must be at least allocated. (It can also be started.) | |
145 | * This is because _ltt_trace_find is used. | |
146 | */ | |
147 | ||
148 | static void inform_consumer_daemon(const char *trace_name) | |
d0b5f2b9 | 149 | { |
ad45e833 PMF |
150 | int i; |
151 | struct ltt_trace_struct *trace; | |
152 | pid_t pid = getpid(); | |
153 | int result; | |
154 | ||
155 | ltt_lock_traces(); | |
156 | ||
157 | trace = _ltt_trace_find(trace_name); | |
158 | if(trace == NULL) { | |
159 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); | |
160 | goto finish; | |
161 | } | |
162 | ||
163 | for(i=0; i < trace->nr_channels; i++) { | |
164 | result = ustcomm_request_consumer(pid, trace->channels[i].channel_name); | |
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 | } | |
170 | ||
171 | finish: | |
172 | ltt_unlock_traces(); | |
d0b5f2b9 | 173 | } |
fbd8191b | 174 | |
3a7b90de PMF |
175 | void process_blocked_consumers(void) |
176 | { | |
177 | int n_fds = 0; | |
178 | struct pollfd *fds; | |
179 | struct blocked_consumer *bc; | |
180 | int idx = 0; | |
181 | char inbuf; | |
182 | int result; | |
183 | ||
184 | list_for_each_entry(bc, &blocked_consumers, list) { | |
185 | n_fds++; | |
186 | } | |
187 | ||
188 | fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); | |
189 | if(fds == NULL) { | |
190 | ERR("malloc returned NULL"); | |
191 | return; | |
192 | } | |
193 | ||
194 | list_for_each_entry(bc, &blocked_consumers, list) { | |
195 | fds[idx].fd = bc->fd_producer; | |
196 | fds[idx].events = POLLIN; | |
197 | bc->tmp_poll_idx = idx; | |
198 | idx++; | |
199 | } | |
200 | ||
69ba0156 PMF |
201 | while((result = poll(fds, n_fds, 0)) == -1 && errno == EINTR) |
202 | /* nothing */; | |
3a7b90de PMF |
203 | if(result == -1) { |
204 | PERROR("poll"); | |
872037bb | 205 | return; |
3a7b90de PMF |
206 | } |
207 | ||
208 | list_for_each_entry(bc, &blocked_consumers, list) { | |
209 | if(fds[bc->tmp_poll_idx].revents) { | |
210 | long consumed_old = 0; | |
211 | char *reply; | |
212 | ||
213 | result = read(bc->fd_producer, &inbuf, 1); | |
214 | if(result == -1) { | |
215 | PERROR("read"); | |
216 | continue; | |
217 | } | |
218 | if(result == 0) { | |
219 | DBG("PRODUCER END"); | |
220 | ||
221 | close(bc->fd_producer); | |
222 | ||
769d0157 | 223 | list_del(&bc->list); |
3a7b90de PMF |
224 | |
225 | result = ustcomm_send_reply(&bc->server, "END", &bc->src); | |
226 | if(result < 0) { | |
227 | ERR("ustcomm_send_reply failed"); | |
228 | continue; | |
229 | } | |
230 | ||
231 | continue; | |
232 | } | |
233 | ||
234 | result = ltt_do_get_subbuf(bc->rbuf, bc->lttbuf, &consumed_old); | |
235 | if(result == -EAGAIN) { | |
236 | WARN("missed buffer?"); | |
237 | continue; | |
238 | } | |
239 | else if(result < 0) { | |
240 | DBG("ltt_do_get_subbuf: error: %s", strerror(-result)); | |
241 | } | |
242 | asprintf(&reply, "%s %ld", "OK", consumed_old); | |
243 | result = ustcomm_send_reply(&bc->server, reply, &bc->src); | |
244 | if(result < 0) { | |
245 | ERR("ustcomm_send_reply failed"); | |
246 | free(reply); | |
247 | continue; | |
248 | } | |
249 | free(reply); | |
250 | ||
769d0157 | 251 | list_del(&bc->list); |
3a7b90de PMF |
252 | } |
253 | } | |
254 | ||
255 | } | |
256 | ||
872037bb | 257 | void *listener_main(void *p) |
98963de4 PMF |
258 | { |
259 | int result; | |
260 | ||
26cc7017 PMF |
261 | ust_register_thread(); |
262 | ||
b0540e11 PMF |
263 | DBG("LISTENER"); |
264 | ||
98963de4 | 265 | for(;;) { |
aafb1650 PMF |
266 | char trace_name[] = "auto"; |
267 | char trace_type[] = "ustrelay"; | |
d0b5f2b9 PMF |
268 | char *recvbuf; |
269 | int len; | |
b02e31e5 | 270 | struct ustcomm_source src; |
98963de4 | 271 | |
3a7b90de PMF |
272 | process_blocked_consumers(); |
273 | ||
274 | result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5); | |
275 | if(result < 0) { | |
d0b5f2b9 PMF |
276 | WARN("error in ustcomm_app_recv_message"); |
277 | continue; | |
278 | } | |
3a7b90de PMF |
279 | else if(result == 0) { |
280 | /* no message */ | |
281 | continue; | |
282 | } | |
98963de4 | 283 | |
08230db7 | 284 | DBG("received a message! it's: %s", recvbuf); |
d0b5f2b9 | 285 | len = strlen(recvbuf); |
98963de4 | 286 | |
d0b5f2b9 | 287 | if(!strcmp(recvbuf, "print_markers")) { |
52c51a47 PMF |
288 | print_markers(stderr); |
289 | } | |
290 | else if(!strcmp(recvbuf, "list_markers")) { | |
291 | char *ptr; | |
292 | size_t size; | |
293 | FILE *fp; | |
294 | ||
295 | fp = open_memstream(&ptr, &size); | |
296 | print_markers(fp); | |
297 | fclose(fp); | |
298 | ||
299 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src); | |
300 | ||
301 | free(ptr); | |
302 | } | |
303 | else if(!strcmp(recvbuf, "start")) { | |
304 | /* start is an operation that setups the trace, allocates it and starts it */ | |
305 | result = ltt_trace_setup(trace_name); | |
306 | if(result < 0) { | |
307 | ERR("ltt_trace_setup failed"); | |
872037bb | 308 | return (void *)1; |
52c51a47 PMF |
309 | } |
310 | ||
311 | result = ltt_trace_set_type(trace_name, trace_type); | |
312 | if(result < 0) { | |
313 | ERR("ltt_trace_set_type failed"); | |
872037bb | 314 | return (void *)1; |
52c51a47 PMF |
315 | } |
316 | ||
317 | result = ltt_trace_alloc(trace_name); | |
318 | if(result < 0) { | |
319 | ERR("ltt_trace_alloc failed"); | |
872037bb | 320 | return (void *)1; |
52c51a47 PMF |
321 | } |
322 | ||
ad45e833 | 323 | inform_consumer_daemon(trace_name); |
52c51a47 PMF |
324 | |
325 | result = ltt_trace_start(trace_name); | |
326 | if(result < 0) { | |
327 | ERR("ltt_trace_start failed"); | |
328 | continue; | |
329 | } | |
d0b5f2b9 PMF |
330 | } |
331 | else if(!strcmp(recvbuf, "trace_setup")) { | |
332 | DBG("trace setup"); | |
fbd8191b | 333 | |
d0b5f2b9 PMF |
334 | result = ltt_trace_setup(trace_name); |
335 | if(result < 0) { | |
336 | ERR("ltt_trace_setup failed"); | |
872037bb | 337 | return (void *)1; |
fbd8191b | 338 | } |
d0b5f2b9 PMF |
339 | |
340 | result = ltt_trace_set_type(trace_name, trace_type); | |
341 | if(result < 0) { | |
342 | ERR("ltt_trace_set_type failed"); | |
872037bb | 343 | return (void *)1; |
fbd8191b | 344 | } |
d0b5f2b9 PMF |
345 | } |
346 | else if(!strcmp(recvbuf, "trace_alloc")) { | |
347 | DBG("trace alloc"); | |
348 | ||
349 | result = ltt_trace_alloc(trace_name); | |
350 | if(result < 0) { | |
351 | ERR("ltt_trace_alloc failed"); | |
872037bb | 352 | return (void *)1; |
fbd8191b | 353 | } |
d0b5f2b9 PMF |
354 | } |
355 | else if(!strcmp(recvbuf, "trace_start")) { | |
356 | DBG("trace start"); | |
357 | ||
358 | result = ltt_trace_start(trace_name); | |
359 | if(result < 0) { | |
360 | ERR("ltt_trace_start failed"); | |
361 | continue; | |
fbd8191b | 362 | } |
d0b5f2b9 PMF |
363 | } |
364 | else if(!strcmp(recvbuf, "trace_stop")) { | |
365 | DBG("trace stop"); | |
366 | ||
367 | result = ltt_trace_stop(trace_name); | |
368 | if(result < 0) { | |
369 | ERR("ltt_trace_stop failed"); | |
872037bb | 370 | return (void *)1; |
aafb1650 | 371 | } |
d0b5f2b9 PMF |
372 | } |
373 | else if(!strcmp(recvbuf, "trace_destroy")) { | |
aafb1650 | 374 | |
d0b5f2b9 | 375 | DBG("trace destroy"); |
aafb1650 | 376 | |
d0b5f2b9 PMF |
377 | result = ltt_trace_destroy(trace_name); |
378 | if(result < 0) { | |
379 | ERR("ltt_trace_destroy failed"); | |
872037bb | 380 | return (void *)1; |
fbd8191b | 381 | } |
98963de4 | 382 | } |
b02e31e5 | 383 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
3847c3ba PMF |
384 | struct ltt_trace_struct *trace; |
385 | char trace_name[] = "auto"; | |
386 | int i; | |
811e4b93 | 387 | char *channel_name; |
3847c3ba PMF |
388 | |
389 | DBG("get_shmid"); | |
390 | ||
811e4b93 PMF |
391 | channel_name = nth_token(recvbuf, 1); |
392 | if(channel_name == NULL) { | |
393 | ERR("get_shmid: cannot parse channel"); | |
394 | goto next_cmd; | |
395 | } | |
396 | ||
3847c3ba PMF |
397 | ltt_lock_traces(); |
398 | trace = _ltt_trace_find(trace_name); | |
399 | ltt_unlock_traces(); | |
400 | ||
401 | if(trace == NULL) { | |
63fe14e5 | 402 | ERR("cannot find trace!"); |
872037bb | 403 | return (void *)1; |
3847c3ba PMF |
404 | } |
405 | ||
406 | for(i=0; i<trace->nr_channels; i++) { | |
407 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
408 | struct rchan_buf *rbuf = rchan->buf; | |
8cefc145 | 409 | struct ltt_channel_struct *ltt_channel = (struct ltt_channel_struct *)rchan->private_data; |
3847c3ba | 410 | |
811e4b93 PMF |
411 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
412 | char *reply; | |
413 | ||
414 | DBG("the shmid for the requested channel is %d", rbuf->shmid); | |
8cefc145 PMF |
415 | DBG("the shmid for its buffer structure is %d", ltt_channel->buf_shmid); |
416 | asprintf(&reply, "%d %d", rbuf->shmid, ltt_channel->buf_shmid); | |
811e4b93 PMF |
417 | |
418 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
419 | if(result) { | |
420 | ERR("listener: get_shmid: ustcomm_send_reply failed"); | |
421 | goto next_cmd; | |
422 | } | |
423 | ||
424 | free(reply); | |
425 | ||
426 | break; | |
427 | } | |
428 | } | |
429 | } | |
430 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { | |
431 | struct ltt_trace_struct *trace; | |
432 | char trace_name[] = "auto"; | |
433 | int i; | |
434 | char *channel_name; | |
435 | ||
436 | DBG("get_n_subbufs"); | |
437 | ||
438 | channel_name = nth_token(recvbuf, 1); | |
439 | if(channel_name == NULL) { | |
440 | ERR("get_n_subbufs: cannot parse channel"); | |
441 | goto next_cmd; | |
442 | } | |
443 | ||
444 | ltt_lock_traces(); | |
445 | trace = _ltt_trace_find(trace_name); | |
446 | ltt_unlock_traces(); | |
447 | ||
448 | if(trace == NULL) { | |
63fe14e5 | 449 | ERR("cannot find trace!"); |
872037bb | 450 | return (void *)1; |
811e4b93 PMF |
451 | } |
452 | ||
453 | for(i=0; i<trace->nr_channels; i++) { | |
454 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
455 | ||
456 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
457 | char *reply; | |
458 | ||
872037bb PMF |
459 | DBG("the n_subbufs for the requested channel is %zd", rchan->n_subbufs); |
460 | asprintf(&reply, "%zd", rchan->n_subbufs); | |
811e4b93 PMF |
461 | |
462 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
463 | if(result) { | |
464 | ERR("listener: get_n_subbufs: ustcomm_send_reply failed"); | |
465 | goto next_cmd; | |
466 | } | |
467 | ||
468 | free(reply); | |
469 | ||
470 | break; | |
471 | } | |
472 | } | |
473 | } | |
474 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { | |
475 | struct ltt_trace_struct *trace; | |
476 | char trace_name[] = "auto"; | |
477 | int i; | |
478 | char *channel_name; | |
479 | ||
480 | DBG("get_subbuf_size"); | |
481 | ||
482 | channel_name = nth_token(recvbuf, 1); | |
483 | if(channel_name == NULL) { | |
484 | ERR("get_subbuf_size: cannot parse channel"); | |
485 | goto next_cmd; | |
486 | } | |
487 | ||
488 | ltt_lock_traces(); | |
489 | trace = _ltt_trace_find(trace_name); | |
490 | ltt_unlock_traces(); | |
491 | ||
492 | if(trace == NULL) { | |
63fe14e5 | 493 | ERR("cannot find trace!"); |
872037bb | 494 | return (void *)1; |
811e4b93 PMF |
495 | } |
496 | ||
497 | for(i=0; i<trace->nr_channels; i++) { | |
498 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
499 | ||
500 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
501 | char *reply; | |
502 | ||
872037bb PMF |
503 | DBG("the subbuf_size for the requested channel is %zd", rchan->subbuf_size); |
504 | asprintf(&reply, "%zd", rchan->subbuf_size); | |
811e4b93 PMF |
505 | |
506 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
507 | if(result) { | |
508 | ERR("listener: get_subbuf_size: ustcomm_send_reply failed"); | |
509 | goto next_cmd; | |
510 | } | |
511 | ||
512 | free(reply); | |
3847c3ba | 513 | |
811e4b93 PMF |
514 | break; |
515 | } | |
3847c3ba PMF |
516 | } |
517 | } | |
b02e31e5 PMF |
518 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
519 | char *libfile; | |
520 | ||
521 | libfile = nth_token(recvbuf, 1); | |
522 | ||
523 | DBG("load_probe_lib loading %s", libfile); | |
524 | } | |
688760ef PMF |
525 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
526 | struct ltt_trace_struct *trace; | |
527 | char trace_name[] = "auto"; | |
528 | int i; | |
529 | char *channel_name; | |
530 | ||
531 | DBG("get_subbuf"); | |
532 | ||
533 | channel_name = nth_token(recvbuf, 1); | |
534 | if(channel_name == NULL) { | |
535 | ERR("get_subbuf: cannot parse channel"); | |
536 | goto next_cmd; | |
537 | } | |
538 | ||
539 | ltt_lock_traces(); | |
540 | trace = _ltt_trace_find(trace_name); | |
541 | ltt_unlock_traces(); | |
542 | ||
543 | if(trace == NULL) { | |
63fe14e5 | 544 | ERR("cannot find trace!"); |
872037bb | 545 | return (void *)1; |
688760ef PMF |
546 | } |
547 | ||
548 | for(i=0; i<trace->nr_channels; i++) { | |
549 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
550 | ||
551 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
552 | struct rchan_buf *rbuf = rchan->buf; | |
553 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; | |
3a7b90de | 554 | struct blocked_consumer *bc; |
688760ef | 555 | |
3a7b90de PMF |
556 | bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); |
557 | if(bc == NULL) { | |
558 | ERR("malloc returned NULL"); | |
688760ef PMF |
559 | goto next_cmd; |
560 | } | |
3a7b90de PMF |
561 | bc->fd_consumer = src.fd; |
562 | bc->fd_producer = lttbuf->data_ready_fd_read; | |
563 | bc->rbuf = rbuf; | |
564 | bc->lttbuf = lttbuf; | |
565 | bc->src = src; | |
566 | bc->server = ustcomm_app.server; | |
688760ef | 567 | |
3a7b90de | 568 | list_add(&bc->list, &blocked_consumers); |
688760ef PMF |
569 | |
570 | break; | |
571 | } | |
572 | } | |
573 | } | |
574 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { | |
575 | struct ltt_trace_struct *trace; | |
576 | char trace_name[] = "auto"; | |
577 | int i; | |
578 | char *channel_name; | |
579 | long consumed_old; | |
580 | char *consumed_old_str; | |
581 | char *endptr; | |
582 | ||
583 | DBG("put_subbuf"); | |
584 | ||
585 | channel_name = strdup_malloc(nth_token(recvbuf, 1)); | |
586 | if(channel_name == NULL) { | |
587 | ERR("put_subbuf_size: cannot parse channel"); | |
588 | goto next_cmd; | |
589 | } | |
590 | ||
591 | consumed_old_str = strdup_malloc(nth_token(recvbuf, 2)); | |
592 | if(consumed_old_str == NULL) { | |
593 | ERR("put_subbuf: cannot parse consumed_old"); | |
594 | goto next_cmd; | |
595 | } | |
596 | consumed_old = strtol(consumed_old_str, &endptr, 10); | |
597 | if(*endptr != '\0') { | |
598 | ERR("put_subbuf: invalid value for consumed_old"); | |
599 | goto next_cmd; | |
600 | } | |
601 | ||
602 | ltt_lock_traces(); | |
603 | trace = _ltt_trace_find(trace_name); | |
604 | ltt_unlock_traces(); | |
605 | ||
606 | if(trace == NULL) { | |
63fe14e5 | 607 | ERR("cannot find trace!"); |
872037bb | 608 | return (void *)1; |
688760ef PMF |
609 | } |
610 | ||
611 | for(i=0; i<trace->nr_channels; i++) { | |
612 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
613 | ||
614 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
615 | struct rchan_buf *rbuf = rchan->buf; | |
616 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; | |
617 | char *reply; | |
618 | long consumed_old=0; | |
619 | ||
620 | result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); | |
621 | if(result < 0) { | |
0a58610f | 622 | WARN("ltt_do_put_subbuf: error (subbuf=%s)", channel_name); |
872037bb | 623 | asprintf(&reply, "%s", "ERROR"); |
688760ef PMF |
624 | } |
625 | else { | |
0a58610f | 626 | DBG("ltt_do_put_subbuf: success (subbuf=%s)", channel_name); |
872037bb | 627 | asprintf(&reply, "%s", "OK"); |
688760ef | 628 | } |
688760ef PMF |
629 | |
630 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
631 | if(result) { | |
632 | ERR("listener: put_subbuf: ustcomm_send_reply failed"); | |
633 | goto next_cmd; | |
634 | } | |
635 | ||
636 | free(reply); | |
637 | ||
638 | break; | |
639 | } | |
640 | } | |
641 | ||
642 | free(channel_name); | |
643 | free(consumed_old_str); | |
644 | } | |
52c51a47 PMF |
645 | else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { |
646 | char *channel_slash_name = nth_token(recvbuf, 1); | |
647 | char channel_name[256]=""; | |
648 | char marker_name[256]=""; | |
52c51a47 PMF |
649 | |
650 | result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); | |
651 | ||
652 | if(channel_name == NULL || marker_name == NULL) { | |
653 | WARN("invalid marker name"); | |
654 | goto next_cmd; | |
655 | } | |
656 | printf("%s %s\n", channel_name, marker_name); | |
657 | ||
658 | result = ltt_marker_connect(channel_name, marker_name, "default"); | |
659 | if(result < 0) { | |
660 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); | |
661 | } | |
662 | } | |
663 | else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { | |
664 | char *channel_slash_name = nth_token(recvbuf, 1); | |
665 | char *marker_name; | |
666 | char *channel_name; | |
52c51a47 PMF |
667 | |
668 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); | |
669 | ||
670 | if(marker_name == NULL) { | |
671 | } | |
672 | printf("%s %s\n", channel_name, marker_name); | |
673 | ||
674 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); | |
675 | if(result < 0) { | |
676 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); | |
677 | } | |
678 | } | |
3a7b90de PMF |
679 | // else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { |
680 | // struct ltt_trace_struct *trace; | |
681 | // char trace_name[] = "auto"; | |
682 | // int i; | |
683 | // char *channel_name; | |
684 | // | |
685 | // DBG("get_notifications"); | |
686 | // | |
687 | // channel_name = strdup_malloc(nth_token(recvbuf, 1)); | |
688 | // if(channel_name == NULL) { | |
689 | // ERR("put_subbuf_size: cannot parse channel"); | |
690 | // goto next_cmd; | |
691 | // } | |
692 | // | |
693 | // ltt_lock_traces(); | |
694 | // trace = _ltt_trace_find(trace_name); | |
695 | // ltt_unlock_traces(); | |
696 | // | |
697 | // if(trace == NULL) { | |
63fe14e5 | 698 | // ERR("cannot find trace!"); |
872037bb | 699 | // return (void *)1; |
3a7b90de PMF |
700 | // } |
701 | // | |
702 | // for(i=0; i<trace->nr_channels; i++) { | |
703 | // struct rchan *rchan = trace->channels[i].trans_channel_data; | |
704 | // int fd; | |
705 | // | |
706 | // if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
707 | // struct rchan_buf *rbuf = rchan->buf; | |
708 | // struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; | |
709 | // | |
710 | // result = fd = ustcomm_app_detach_client(&ustcomm_app, &src); | |
711 | // if(result == -1) { | |
712 | // ERR("ustcomm_app_detach_client failed"); | |
713 | // goto next_cmd; | |
714 | // } | |
715 | // | |
716 | // lttbuf->wake_consumer_arg = (void *) fd; | |
717 | // | |
718 | // smp_wmb(); | |
719 | // | |
720 | // lttbuf->call_wake_consumer = 1; | |
721 | // | |
722 | // break; | |
723 | // } | |
724 | // } | |
725 | // | |
726 | // free(channel_name); | |
727 | // } | |
688760ef PMF |
728 | else { |
729 | ERR("unable to parse message: %s", recvbuf); | |
730 | } | |
d0b5f2b9 | 731 | |
811e4b93 | 732 | next_cmd: |
d0b5f2b9 | 733 | free(recvbuf); |
98963de4 PMF |
734 | } |
735 | } | |
736 | ||
4440ebcb PMF |
737 | int have_listener = 0; |
738 | ||
98963de4 PMF |
739 | void create_listener(void) |
740 | { | |
9160b4e4 | 741 | #ifdef USE_CLONE |
98963de4 | 742 | static char listener_stack[16384]; |
4440ebcb PMF |
743 | #else |
744 | pthread_t thread; | |
9160b4e4 | 745 | #endif |
98963de4 | 746 | |
4440ebcb PMF |
747 | if(have_listener) |
748 | return; | |
749 | ||
3847c3ba | 750 | #ifdef USE_CLONE |
fbd8191b | 751 | result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
98963de4 PMF |
752 | if(result == -1) { |
753 | perror("clone"); | |
4440ebcb | 754 | return; |
98963de4 | 755 | } |
3847c3ba | 756 | #else |
b0540e11 | 757 | |
3847c3ba PMF |
758 | pthread_create(&thread, NULL, listener_main, NULL); |
759 | #endif | |
4440ebcb PMF |
760 | |
761 | have_listener = 1; | |
98963de4 PMF |
762 | } |
763 | ||
d0b5f2b9 PMF |
764 | /* The signal handler itself. Signals must be setup so there cannot be |
765 | nested signals. */ | |
68c1021b PMF |
766 | |
767 | void sighandler(int sig) | |
768 | { | |
d0b5f2b9 | 769 | static char have_listener = 0; |
68c1021b | 770 | DBG("sighandler"); |
d0b5f2b9 PMF |
771 | |
772 | if(!have_listener) { | |
773 | create_listener(); | |
774 | have_listener = 1; | |
775 | } | |
68c1021b PMF |
776 | } |
777 | ||
778 | /* Called by the app signal handler to chain it to us. */ | |
779 | ||
98963de4 | 780 | void chain_signal(void) |
68c1021b PMF |
781 | { |
782 | sighandler(USTSIGNAL); | |
783 | } | |
784 | ||
98963de4 | 785 | static int init_socket(void) |
68c1021b | 786 | { |
d0b5f2b9 | 787 | return ustcomm_init_app(getpid(), &ustcomm_app); |
68c1021b PMF |
788 | } |
789 | ||
9160b4e4 PMF |
790 | /* FIXME: reenable this to delete socket file. */ |
791 | ||
792 | #if 0 | |
98963de4 | 793 | static void destroy_socket(void) |
68c1021b | 794 | { |
9160b4e4 PMF |
795 | int result; |
796 | ||
797 | if(mysocketfile[0] == '\0') | |
798 | return; | |
799 | ||
800 | result = unlink(mysocketfile); | |
801 | if(result == -1) { | |
802 | PERROR("unlink"); | |
803 | } | |
68c1021b | 804 | } |
9160b4e4 | 805 | #endif |
68c1021b | 806 | |
98963de4 | 807 | static int init_signal_handler(void) |
68c1021b PMF |
808 | { |
809 | /* Attempt to handler SIGIO. If the main program wants to | |
810 | * handle it, fine, it'll override us. They it'll have to | |
811 | * use the chaining function. | |
812 | */ | |
813 | ||
814 | int result; | |
815 | struct sigaction act; | |
816 | ||
817 | result = sigemptyset(&act.sa_mask); | |
818 | if(result == -1) { | |
819 | PERROR("sigemptyset"); | |
820 | return -1; | |
821 | } | |
822 | ||
823 | act.sa_handler = sighandler; | |
824 | act.sa_flags = SA_RESTART; | |
825 | ||
826 | /* Only defer ourselves. Also, try to restart interrupted | |
827 | * syscalls to disturb the traced program as little as possible. | |
828 | */ | |
829 | result = sigaction(SIGIO, &act, NULL); | |
830 | if(result == -1) { | |
831 | PERROR("sigaction"); | |
832 | return -1; | |
833 | } | |
834 | ||
835 | return 0; | |
836 | } | |
837 | ||
5de74e51 PMF |
838 | #define AUTOPROBE_DISABLED 0 |
839 | #define AUTOPROBE_ENABLE_ALL 1 | |
840 | #define AUTOPROBE_ENABLE_REGEX 2 | |
841 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
842 | static regex_t autoprobe_regex; | |
ef290fca | 843 | |
20b37a31 | 844 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
845 | { |
846 | int result; | |
847 | ||
5de74e51 PMF |
848 | char* concat_name = NULL; |
849 | const char *probe_name = "default"; | |
ef290fca | 850 | |
5de74e51 | 851 | if(autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca PMF |
852 | return; |
853 | } | |
5de74e51 PMF |
854 | else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
855 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); | |
856 | if(result == -1) { | |
857 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", | |
858 | m->channel, m->name); | |
859 | return; | |
860 | } | |
861 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
862 | free(concat_name); | |
863 | return; | |
864 | } | |
865 | free(concat_name); | |
ef290fca PMF |
866 | } |
867 | ||
5de74e51 | 868 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
acbf228b PMF |
869 | if(result && result != -EEXIST) |
870 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); | |
20b37a31 | 871 | |
5de74e51 | 872 | DBG("auto connected marker %s %s to probe default", m->channel, m->name); |
ef290fca | 873 | |
20b37a31 PMF |
874 | } |
875 | ||
876 | static void __attribute__((constructor(1000))) init() | |
877 | { | |
878 | int result; | |
5de74e51 | 879 | char* autoprobe_val = NULL; |
20b37a31 | 880 | |
4440ebcb PMF |
881 | /* Initialize RCU in case the constructor order is not good. */ |
882 | urcu_init(); | |
883 | ||
884 | /* It is important to do this before events start to be generated. */ | |
885 | ust_register_thread(); | |
886 | ||
5de74e51 | 887 | DBG("Tracectl constructor"); |
20b37a31 | 888 | |
3847c3ba PMF |
889 | /* Must create socket before signal handler to prevent races. |
890 | */ | |
891 | result = init_socket(); | |
892 | if(result == -1) { | |
893 | ERR("init_socket error"); | |
894 | return; | |
895 | } | |
896 | result = init_signal_handler(); | |
897 | if(result == -1) { | |
898 | ERR("init_signal_handler error"); | |
899 | return; | |
900 | } | |
68c1021b | 901 | |
5de74e51 PMF |
902 | autoprobe_val = getenv("UST_AUTOPROBE"); |
903 | if(autoprobe_val) { | |
4440ebcb PMF |
904 | struct marker_iter iter; |
905 | ||
08230db7 | 906 | DBG("Autoprobe enabled."); |
4440ebcb PMF |
907 | |
908 | /* Ensure markers are initialized */ | |
909 | //init_markers(); | |
910 | ||
911 | /* Ensure marker control is initialized, for the probe */ | |
912 | init_marker_control(); | |
913 | ||
914 | /* first, set the callback that will connect the | |
915 | * probe on new markers | |
916 | */ | |
5de74e51 PMF |
917 | if(autoprobe_val[0] == '/') { |
918 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); | |
919 | if (result) { | |
920 | char regexerr[150]; | |
921 | ||
922 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
923 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
924 | /* don't crash the application just for this */ | |
925 | } | |
926 | else { | |
927 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; | |
928 | } | |
ef290fca | 929 | } |
5de74e51 PMF |
930 | else { |
931 | /* just enable all instrumentation */ | |
932 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
933 | } | |
934 | ||
935 | marker_set_new_marker_cb(auto_probe_connect); | |
936 | ||
4440ebcb PMF |
937 | /* Now, connect the probes that were already registered. */ |
938 | marker_iter_reset(&iter); | |
939 | marker_iter_start(&iter); | |
940 | ||
08230db7 | 941 | DBG("now iterating on markers already registered"); |
4440ebcb | 942 | while(iter.marker) { |
08230db7 | 943 | DBG("now iterating on marker %s", iter.marker->name); |
4440ebcb PMF |
944 | auto_probe_connect(iter.marker); |
945 | marker_iter_next(&iter); | |
946 | } | |
947 | } | |
948 | ||
4db647c5 PMF |
949 | if(getenv("UST_TRACE")) { |
950 | char trace_name[] = "auto"; | |
951 | char trace_type[] = "ustrelay"; | |
952 | ||
953 | DBG("starting early tracing"); | |
954 | ||
955 | /* Ensure marker control is initialized */ | |
956 | init_marker_control(); | |
957 | ||
958 | /* Ensure relay is initialized */ | |
959 | init_ustrelay_transport(); | |
960 | ||
961 | /* Ensure markers are initialized */ | |
962 | init_markers(); | |
963 | ||
20b37a31 PMF |
964 | /* In case. */ |
965 | ltt_channels_register("ust"); | |
4db647c5 PMF |
966 | |
967 | result = ltt_trace_setup(trace_name); | |
968 | if(result < 0) { | |
969 | ERR("ltt_trace_setup failed"); | |
970 | return; | |
971 | } | |
972 | ||
973 | result = ltt_trace_set_type(trace_name, trace_type); | |
974 | if(result < 0) { | |
975 | ERR("ltt_trace_set_type failed"); | |
976 | return; | |
977 | } | |
978 | ||
979 | result = ltt_trace_alloc(trace_name); | |
980 | if(result < 0) { | |
981 | ERR("ltt_trace_alloc failed"); | |
982 | return; | |
983 | } | |
984 | ||
ad45e833 PMF |
985 | inform_consumer_daemon(trace_name); |
986 | ||
4db647c5 PMF |
987 | result = ltt_trace_start(trace_name); |
988 | if(result < 0) { | |
989 | ERR("ltt_trace_start failed"); | |
990 | return; | |
991 | } | |
992 | } | |
993 | ||
68c1021b PMF |
994 | |
995 | return; | |
996 | ||
997 | /* should decrementally destroy stuff if error */ | |
998 | ||
999 | } | |
1000 | ||
1001 | /* This is only called if we terminate normally, not with an unhandled signal, | |
1002 | * so we cannot rely on it. */ | |
1003 | ||
899b5967 PMF |
1004 | /* This destructor probably isn't needed, because ustd can do crash recovery. */ |
1005 | #if 0 | |
98963de4 | 1006 | static void __attribute__((destructor)) fini() |
68c1021b | 1007 | { |
a584bc4e PMF |
1008 | int result; |
1009 | ||
1010 | /* if trace running, finish it */ | |
1011 | ||
1012 | DBG("destructor stopping traces"); | |
1013 | ||
1014 | result = ltt_trace_stop("auto"); | |
1015 | if(result == -1) { | |
1016 | ERR("ltt_trace_stop error"); | |
1017 | } | |
1018 | ||
1019 | result = ltt_trace_destroy("auto"); | |
1020 | if(result == -1) { | |
1021 | ERR("ltt_trace_destroy error"); | |
1022 | } | |
1023 | ||
68c1021b PMF |
1024 | destroy_socket(); |
1025 | } | |
899b5967 | 1026 | #endif |
1e2944cb | 1027 | |
97d9b88b PMF |
1028 | #if 0 |
1029 | static int trace_recording(void) | |
1030 | { | |
1031 | int retval = 0; | |
1032 | struct ltt_trace_struct *trace; | |
1033 | ||
1034 | ltt_lock_traces(); | |
1035 | ||
1036 | list_for_each_entry(trace, <t_traces.head, list) { | |
1037 | if(trace->active) { | |
1038 | retval = 1; | |
1039 | break; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | ltt_unlock_traces(); | |
1044 | ||
1045 | return retval; | |
1046 | } | |
1047 | ||
1048 | static int have_consumer(void) | |
1049 | { | |
1050 | return !list_empty(&blocked_consumers); | |
1051 | } | |
1052 | ||
1053 | /* This destructor keeps the process alive for a few seconds in order | |
1054 | * to leave time to ustd to consume its buffers. | |
1055 | */ | |
1056 | ||
1057 | int restarting_sleep(int secs) | |
1058 | { | |
1059 | struct timespec tv; | |
1060 | int result; | |
1061 | ||
1062 | tv.tv_sec = secs; | |
1063 | tv.tv_nsec = 0; | |
1064 | ||
1065 | do { | |
1066 | result = nanosleep(&tv, &tv); | |
1067 | } while(result == -1 && errno == EINTR); | |
1068 | ||
1069 | return result; | |
1070 | } | |
1071 | ||
1072 | static void __attribute__((destructor)) keepalive() | |
1073 | { | |
1074 | // struct ustcomm_ustd ustd; | |
1075 | // int result; | |
1076 | // sigset_t sigset; | |
1077 | // | |
1078 | // result = sigemptyset(&sigset); | |
1079 | // if(result == -1) { | |
1080 | // perror("sigemptyset"); | |
1081 | // return; | |
1082 | // } | |
1083 | // result = sigaddset(&sigset, SIGIO); | |
1084 | // if(result == -1) { | |
1085 | // perror("sigaddset"); | |
1086 | // return; | |
1087 | // } | |
1088 | // result = sigprocmask(SIG_BLOCK, &sigset, NULL); | |
1089 | // if(result == -1) { | |
1090 | // perror("sigprocmask"); | |
1091 | // return; | |
1092 | // } | |
1093 | // | |
1094 | // if(trace_recording()) { | |
1095 | // if(!have_consumer()) { | |
1096 | // /* Request listener creation. We've blocked SIGIO's in | |
1097 | // * order to not interrupt sleep(), so we will miss the | |
1098 | // * one sent by the daemon and therefore won't create | |
1099 | // * the listener automatically. | |
1100 | // */ | |
1101 | // create_listener(); | |
1102 | // | |
1103 | printf("Keeping process alive for consumer daemon...\n"); | |
1104 | restarting_sleep(3); | |
1105 | printf("Finally dying...\n"); | |
1106 | // } | |
1107 | // } | |
1108 | // | |
1109 | // result = sigprocmask(SIG_UNBLOCK, &sigset, NULL); | |
1110 | // if(result == -1) { | |
1111 | // perror("sigprocmask"); | |
1112 | // return; | |
1113 | // } | |
1114 | } | |
1115 | #endif | |
1116 | ||
1e2944cb PMF |
1117 | /* Notify ust that there was a fork. This needs to be called inside |
1118 | * the new process, anytime a process whose memory is not shared with | |
1119 | * the parent is created. If this function is not called, the events | |
1120 | * of the new process will not be collected. | |
1121 | */ | |
1122 | ||
1123 | void ust_fork(void) | |
1124 | { | |
1125 | DBG("ust: forking"); | |
1126 | ltt_trace_stop("auto"); | |
1127 | ltt_trace_destroy("auto"); | |
1128 | ltt_trace_alloc("auto"); | |
1129 | ltt_trace_start("auto"); | |
1130 | init_socket(); | |
1131 | have_listener = 0; | |
1132 | create_listener(); | |
ad45e833 | 1133 | inform_consumer_daemon("auto"); |
1e2944cb PMF |
1134 | } |
1135 |