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 | ||
872037bb | 141 | static void inform_consumer_daemon(void) |
d0b5f2b9 | 142 | { |
3847c3ba PMF |
143 | ustcomm_request_consumer(getpid(), "metadata"); |
144 | ustcomm_request_consumer(getpid(), "ust"); | |
d0b5f2b9 | 145 | } |
fbd8191b | 146 | |
3a7b90de PMF |
147 | void process_blocked_consumers(void) |
148 | { | |
149 | int n_fds = 0; | |
150 | struct pollfd *fds; | |
151 | struct blocked_consumer *bc; | |
152 | int idx = 0; | |
153 | char inbuf; | |
154 | int result; | |
155 | ||
156 | list_for_each_entry(bc, &blocked_consumers, list) { | |
157 | n_fds++; | |
158 | } | |
159 | ||
160 | fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); | |
161 | if(fds == NULL) { | |
162 | ERR("malloc returned NULL"); | |
163 | return; | |
164 | } | |
165 | ||
166 | list_for_each_entry(bc, &blocked_consumers, list) { | |
167 | fds[idx].fd = bc->fd_producer; | |
168 | fds[idx].events = POLLIN; | |
169 | bc->tmp_poll_idx = idx; | |
170 | idx++; | |
171 | } | |
172 | ||
69ba0156 PMF |
173 | while((result = poll(fds, n_fds, 0)) == -1 && errno == EINTR) |
174 | /* nothing */; | |
3a7b90de PMF |
175 | if(result == -1) { |
176 | PERROR("poll"); | |
872037bb | 177 | return; |
3a7b90de PMF |
178 | } |
179 | ||
180 | list_for_each_entry(bc, &blocked_consumers, list) { | |
181 | if(fds[bc->tmp_poll_idx].revents) { | |
182 | long consumed_old = 0; | |
183 | char *reply; | |
184 | ||
185 | result = read(bc->fd_producer, &inbuf, 1); | |
186 | if(result == -1) { | |
187 | PERROR("read"); | |
188 | continue; | |
189 | } | |
190 | if(result == 0) { | |
191 | DBG("PRODUCER END"); | |
192 | ||
193 | close(bc->fd_producer); | |
194 | ||
769d0157 | 195 | list_del(&bc->list); |
3a7b90de PMF |
196 | |
197 | result = ustcomm_send_reply(&bc->server, "END", &bc->src); | |
198 | if(result < 0) { | |
199 | ERR("ustcomm_send_reply failed"); | |
200 | continue; | |
201 | } | |
202 | ||
203 | continue; | |
204 | } | |
205 | ||
206 | result = ltt_do_get_subbuf(bc->rbuf, bc->lttbuf, &consumed_old); | |
207 | if(result == -EAGAIN) { | |
208 | WARN("missed buffer?"); | |
209 | continue; | |
210 | } | |
211 | else if(result < 0) { | |
212 | DBG("ltt_do_get_subbuf: error: %s", strerror(-result)); | |
213 | } | |
214 | asprintf(&reply, "%s %ld", "OK", consumed_old); | |
215 | result = ustcomm_send_reply(&bc->server, reply, &bc->src); | |
216 | if(result < 0) { | |
217 | ERR("ustcomm_send_reply failed"); | |
218 | free(reply); | |
219 | continue; | |
220 | } | |
221 | free(reply); | |
222 | ||
769d0157 | 223 | list_del(&bc->list); |
3a7b90de PMF |
224 | } |
225 | } | |
226 | ||
227 | } | |
228 | ||
872037bb | 229 | void *listener_main(void *p) |
98963de4 PMF |
230 | { |
231 | int result; | |
232 | ||
26cc7017 PMF |
233 | ust_register_thread(); |
234 | ||
b0540e11 PMF |
235 | DBG("LISTENER"); |
236 | ||
98963de4 | 237 | for(;;) { |
aafb1650 PMF |
238 | char trace_name[] = "auto"; |
239 | char trace_type[] = "ustrelay"; | |
d0b5f2b9 PMF |
240 | char *recvbuf; |
241 | int len; | |
b02e31e5 | 242 | struct ustcomm_source src; |
98963de4 | 243 | |
3a7b90de PMF |
244 | process_blocked_consumers(); |
245 | ||
246 | result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5); | |
247 | if(result < 0) { | |
d0b5f2b9 PMF |
248 | WARN("error in ustcomm_app_recv_message"); |
249 | continue; | |
250 | } | |
3a7b90de PMF |
251 | else if(result == 0) { |
252 | /* no message */ | |
253 | continue; | |
254 | } | |
98963de4 | 255 | |
d0b5f2b9 PMF |
256 | DBG("received a message! it's: %s\n", recvbuf); |
257 | len = strlen(recvbuf); | |
98963de4 | 258 | |
d0b5f2b9 | 259 | if(!strcmp(recvbuf, "print_markers")) { |
52c51a47 PMF |
260 | print_markers(stderr); |
261 | } | |
262 | else if(!strcmp(recvbuf, "list_markers")) { | |
263 | char *ptr; | |
264 | size_t size; | |
265 | FILE *fp; | |
266 | ||
267 | fp = open_memstream(&ptr, &size); | |
268 | print_markers(fp); | |
269 | fclose(fp); | |
270 | ||
271 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src); | |
272 | ||
273 | free(ptr); | |
274 | } | |
275 | else if(!strcmp(recvbuf, "start")) { | |
276 | /* start is an operation that setups the trace, allocates it and starts it */ | |
277 | result = ltt_trace_setup(trace_name); | |
278 | if(result < 0) { | |
279 | ERR("ltt_trace_setup failed"); | |
872037bb | 280 | return (void *)1; |
52c51a47 PMF |
281 | } |
282 | ||
283 | result = ltt_trace_set_type(trace_name, trace_type); | |
284 | if(result < 0) { | |
285 | ERR("ltt_trace_set_type failed"); | |
872037bb | 286 | return (void *)1; |
52c51a47 PMF |
287 | } |
288 | ||
289 | result = ltt_trace_alloc(trace_name); | |
290 | if(result < 0) { | |
291 | ERR("ltt_trace_alloc failed"); | |
872037bb | 292 | return (void *)1; |
52c51a47 PMF |
293 | } |
294 | ||
295 | inform_consumer_daemon(); | |
296 | ||
297 | result = ltt_trace_start(trace_name); | |
298 | if(result < 0) { | |
299 | ERR("ltt_trace_start failed"); | |
300 | continue; | |
301 | } | |
d0b5f2b9 PMF |
302 | } |
303 | else if(!strcmp(recvbuf, "trace_setup")) { | |
304 | DBG("trace setup"); | |
fbd8191b | 305 | |
d0b5f2b9 PMF |
306 | result = ltt_trace_setup(trace_name); |
307 | if(result < 0) { | |
308 | ERR("ltt_trace_setup failed"); | |
872037bb | 309 | return (void *)1; |
fbd8191b | 310 | } |
d0b5f2b9 PMF |
311 | |
312 | result = ltt_trace_set_type(trace_name, trace_type); | |
313 | if(result < 0) { | |
314 | ERR("ltt_trace_set_type failed"); | |
872037bb | 315 | return (void *)1; |
fbd8191b | 316 | } |
d0b5f2b9 PMF |
317 | } |
318 | else if(!strcmp(recvbuf, "trace_alloc")) { | |
319 | DBG("trace alloc"); | |
320 | ||
321 | result = ltt_trace_alloc(trace_name); | |
322 | if(result < 0) { | |
323 | ERR("ltt_trace_alloc failed"); | |
872037bb | 324 | return (void *)1; |
fbd8191b | 325 | } |
d0b5f2b9 PMF |
326 | } |
327 | else if(!strcmp(recvbuf, "trace_start")) { | |
328 | DBG("trace start"); | |
329 | ||
330 | result = ltt_trace_start(trace_name); | |
331 | if(result < 0) { | |
332 | ERR("ltt_trace_start failed"); | |
333 | continue; | |
fbd8191b | 334 | } |
d0b5f2b9 PMF |
335 | } |
336 | else if(!strcmp(recvbuf, "trace_stop")) { | |
337 | DBG("trace stop"); | |
338 | ||
339 | result = ltt_trace_stop(trace_name); | |
340 | if(result < 0) { | |
341 | ERR("ltt_trace_stop failed"); | |
872037bb | 342 | return (void *)1; |
aafb1650 | 343 | } |
d0b5f2b9 PMF |
344 | } |
345 | else if(!strcmp(recvbuf, "trace_destroy")) { | |
aafb1650 | 346 | |
d0b5f2b9 | 347 | DBG("trace destroy"); |
aafb1650 | 348 | |
d0b5f2b9 PMF |
349 | result = ltt_trace_destroy(trace_name); |
350 | if(result < 0) { | |
351 | ERR("ltt_trace_destroy failed"); | |
872037bb | 352 | return (void *)1; |
fbd8191b | 353 | } |
98963de4 | 354 | } |
b02e31e5 | 355 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
3847c3ba PMF |
356 | struct ltt_trace_struct *trace; |
357 | char trace_name[] = "auto"; | |
358 | int i; | |
811e4b93 | 359 | char *channel_name; |
3847c3ba PMF |
360 | |
361 | DBG("get_shmid"); | |
362 | ||
811e4b93 PMF |
363 | channel_name = nth_token(recvbuf, 1); |
364 | if(channel_name == NULL) { | |
365 | ERR("get_shmid: cannot parse channel"); | |
366 | goto next_cmd; | |
367 | } | |
368 | ||
3847c3ba PMF |
369 | ltt_lock_traces(); |
370 | trace = _ltt_trace_find(trace_name); | |
371 | ltt_unlock_traces(); | |
372 | ||
373 | if(trace == NULL) { | |
63fe14e5 | 374 | ERR("cannot find trace!"); |
872037bb | 375 | return (void *)1; |
3847c3ba PMF |
376 | } |
377 | ||
378 | for(i=0; i<trace->nr_channels; i++) { | |
379 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
380 | struct rchan_buf *rbuf = rchan->buf; | |
8cefc145 | 381 | struct ltt_channel_struct *ltt_channel = (struct ltt_channel_struct *)rchan->private_data; |
3847c3ba | 382 | |
811e4b93 PMF |
383 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
384 | char *reply; | |
385 | ||
386 | DBG("the shmid for the requested channel is %d", rbuf->shmid); | |
8cefc145 PMF |
387 | DBG("the shmid for its buffer structure is %d", ltt_channel->buf_shmid); |
388 | asprintf(&reply, "%d %d", rbuf->shmid, ltt_channel->buf_shmid); | |
811e4b93 PMF |
389 | |
390 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
391 | if(result) { | |
392 | ERR("listener: get_shmid: ustcomm_send_reply failed"); | |
393 | goto next_cmd; | |
394 | } | |
395 | ||
396 | free(reply); | |
397 | ||
398 | break; | |
399 | } | |
400 | } | |
401 | } | |
402 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { | |
403 | struct ltt_trace_struct *trace; | |
404 | char trace_name[] = "auto"; | |
405 | int i; | |
406 | char *channel_name; | |
407 | ||
408 | DBG("get_n_subbufs"); | |
409 | ||
410 | channel_name = nth_token(recvbuf, 1); | |
411 | if(channel_name == NULL) { | |
412 | ERR("get_n_subbufs: cannot parse channel"); | |
413 | goto next_cmd; | |
414 | } | |
415 | ||
416 | ltt_lock_traces(); | |
417 | trace = _ltt_trace_find(trace_name); | |
418 | ltt_unlock_traces(); | |
419 | ||
420 | if(trace == NULL) { | |
63fe14e5 | 421 | ERR("cannot find trace!"); |
872037bb | 422 | return (void *)1; |
811e4b93 PMF |
423 | } |
424 | ||
425 | for(i=0; i<trace->nr_channels; i++) { | |
426 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
427 | ||
428 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
429 | char *reply; | |
430 | ||
872037bb PMF |
431 | DBG("the n_subbufs for the requested channel is %zd", rchan->n_subbufs); |
432 | asprintf(&reply, "%zd", rchan->n_subbufs); | |
811e4b93 PMF |
433 | |
434 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
435 | if(result) { | |
436 | ERR("listener: get_n_subbufs: ustcomm_send_reply failed"); | |
437 | goto next_cmd; | |
438 | } | |
439 | ||
440 | free(reply); | |
441 | ||
442 | break; | |
443 | } | |
444 | } | |
445 | } | |
446 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { | |
447 | struct ltt_trace_struct *trace; | |
448 | char trace_name[] = "auto"; | |
449 | int i; | |
450 | char *channel_name; | |
451 | ||
452 | DBG("get_subbuf_size"); | |
453 | ||
454 | channel_name = nth_token(recvbuf, 1); | |
455 | if(channel_name == NULL) { | |
456 | ERR("get_subbuf_size: cannot parse channel"); | |
457 | goto next_cmd; | |
458 | } | |
459 | ||
460 | ltt_lock_traces(); | |
461 | trace = _ltt_trace_find(trace_name); | |
462 | ltt_unlock_traces(); | |
463 | ||
464 | if(trace == NULL) { | |
63fe14e5 | 465 | ERR("cannot find trace!"); |
872037bb | 466 | return (void *)1; |
811e4b93 PMF |
467 | } |
468 | ||
469 | for(i=0; i<trace->nr_channels; i++) { | |
470 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
471 | ||
472 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
473 | char *reply; | |
474 | ||
872037bb PMF |
475 | DBG("the subbuf_size for the requested channel is %zd", rchan->subbuf_size); |
476 | asprintf(&reply, "%zd", rchan->subbuf_size); | |
811e4b93 PMF |
477 | |
478 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
479 | if(result) { | |
480 | ERR("listener: get_subbuf_size: ustcomm_send_reply failed"); | |
481 | goto next_cmd; | |
482 | } | |
483 | ||
484 | free(reply); | |
3847c3ba | 485 | |
811e4b93 PMF |
486 | break; |
487 | } | |
3847c3ba PMF |
488 | } |
489 | } | |
b02e31e5 PMF |
490 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
491 | char *libfile; | |
492 | ||
493 | libfile = nth_token(recvbuf, 1); | |
494 | ||
495 | DBG("load_probe_lib loading %s", libfile); | |
496 | } | |
688760ef PMF |
497 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
498 | struct ltt_trace_struct *trace; | |
499 | char trace_name[] = "auto"; | |
500 | int i; | |
501 | char *channel_name; | |
502 | ||
503 | DBG("get_subbuf"); | |
504 | ||
505 | channel_name = nth_token(recvbuf, 1); | |
506 | if(channel_name == NULL) { | |
507 | ERR("get_subbuf: cannot parse channel"); | |
508 | goto next_cmd; | |
509 | } | |
510 | ||
511 | ltt_lock_traces(); | |
512 | trace = _ltt_trace_find(trace_name); | |
513 | ltt_unlock_traces(); | |
514 | ||
515 | if(trace == NULL) { | |
63fe14e5 | 516 | ERR("cannot find trace!"); |
872037bb | 517 | return (void *)1; |
688760ef PMF |
518 | } |
519 | ||
520 | for(i=0; i<trace->nr_channels; i++) { | |
521 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
522 | ||
523 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
524 | struct rchan_buf *rbuf = rchan->buf; | |
525 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; | |
3a7b90de | 526 | struct blocked_consumer *bc; |
688760ef | 527 | |
3a7b90de PMF |
528 | bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); |
529 | if(bc == NULL) { | |
530 | ERR("malloc returned NULL"); | |
688760ef PMF |
531 | goto next_cmd; |
532 | } | |
3a7b90de PMF |
533 | bc->fd_consumer = src.fd; |
534 | bc->fd_producer = lttbuf->data_ready_fd_read; | |
535 | bc->rbuf = rbuf; | |
536 | bc->lttbuf = lttbuf; | |
537 | bc->src = src; | |
538 | bc->server = ustcomm_app.server; | |
688760ef | 539 | |
3a7b90de | 540 | list_add(&bc->list, &blocked_consumers); |
688760ef PMF |
541 | |
542 | break; | |
543 | } | |
544 | } | |
545 | } | |
546 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { | |
547 | struct ltt_trace_struct *trace; | |
548 | char trace_name[] = "auto"; | |
549 | int i; | |
550 | char *channel_name; | |
551 | long consumed_old; | |
552 | char *consumed_old_str; | |
553 | char *endptr; | |
554 | ||
555 | DBG("put_subbuf"); | |
556 | ||
557 | channel_name = strdup_malloc(nth_token(recvbuf, 1)); | |
558 | if(channel_name == NULL) { | |
559 | ERR("put_subbuf_size: cannot parse channel"); | |
560 | goto next_cmd; | |
561 | } | |
562 | ||
563 | consumed_old_str = strdup_malloc(nth_token(recvbuf, 2)); | |
564 | if(consumed_old_str == NULL) { | |
565 | ERR("put_subbuf: cannot parse consumed_old"); | |
566 | goto next_cmd; | |
567 | } | |
568 | consumed_old = strtol(consumed_old_str, &endptr, 10); | |
569 | if(*endptr != '\0') { | |
570 | ERR("put_subbuf: invalid value for consumed_old"); | |
571 | goto next_cmd; | |
572 | } | |
573 | ||
574 | ltt_lock_traces(); | |
575 | trace = _ltt_trace_find(trace_name); | |
576 | ltt_unlock_traces(); | |
577 | ||
578 | if(trace == NULL) { | |
63fe14e5 | 579 | ERR("cannot find trace!"); |
872037bb | 580 | return (void *)1; |
688760ef PMF |
581 | } |
582 | ||
583 | for(i=0; i<trace->nr_channels; i++) { | |
584 | struct rchan *rchan = trace->channels[i].trans_channel_data; | |
585 | ||
586 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
587 | struct rchan_buf *rbuf = rchan->buf; | |
588 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; | |
589 | char *reply; | |
590 | long consumed_old=0; | |
591 | ||
592 | result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); | |
593 | if(result < 0) { | |
0a58610f | 594 | WARN("ltt_do_put_subbuf: error (subbuf=%s)", channel_name); |
872037bb | 595 | asprintf(&reply, "%s", "ERROR"); |
688760ef PMF |
596 | } |
597 | else { | |
0a58610f | 598 | DBG("ltt_do_put_subbuf: success (subbuf=%s)", channel_name); |
872037bb | 599 | asprintf(&reply, "%s", "OK"); |
688760ef | 600 | } |
688760ef PMF |
601 | |
602 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); | |
603 | if(result) { | |
604 | ERR("listener: put_subbuf: ustcomm_send_reply failed"); | |
605 | goto next_cmd; | |
606 | } | |
607 | ||
608 | free(reply); | |
609 | ||
610 | break; | |
611 | } | |
612 | } | |
613 | ||
614 | free(channel_name); | |
615 | free(consumed_old_str); | |
616 | } | |
52c51a47 PMF |
617 | else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { |
618 | char *channel_slash_name = nth_token(recvbuf, 1); | |
619 | char channel_name[256]=""; | |
620 | char marker_name[256]=""; | |
52c51a47 PMF |
621 | |
622 | result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); | |
623 | ||
624 | if(channel_name == NULL || marker_name == NULL) { | |
625 | WARN("invalid marker name"); | |
626 | goto next_cmd; | |
627 | } | |
628 | printf("%s %s\n", channel_name, marker_name); | |
629 | ||
630 | result = ltt_marker_connect(channel_name, marker_name, "default"); | |
631 | if(result < 0) { | |
632 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); | |
633 | } | |
634 | } | |
635 | else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { | |
636 | char *channel_slash_name = nth_token(recvbuf, 1); | |
637 | char *marker_name; | |
638 | char *channel_name; | |
52c51a47 PMF |
639 | |
640 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); | |
641 | ||
642 | if(marker_name == NULL) { | |
643 | } | |
644 | printf("%s %s\n", channel_name, marker_name); | |
645 | ||
646 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); | |
647 | if(result < 0) { | |
648 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); | |
649 | } | |
650 | } | |
3a7b90de PMF |
651 | // else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { |
652 | // struct ltt_trace_struct *trace; | |
653 | // char trace_name[] = "auto"; | |
654 | // int i; | |
655 | // char *channel_name; | |
656 | // | |
657 | // DBG("get_notifications"); | |
658 | // | |
659 | // channel_name = strdup_malloc(nth_token(recvbuf, 1)); | |
660 | // if(channel_name == NULL) { | |
661 | // ERR("put_subbuf_size: cannot parse channel"); | |
662 | // goto next_cmd; | |
663 | // } | |
664 | // | |
665 | // ltt_lock_traces(); | |
666 | // trace = _ltt_trace_find(trace_name); | |
667 | // ltt_unlock_traces(); | |
668 | // | |
669 | // if(trace == NULL) { | |
63fe14e5 | 670 | // ERR("cannot find trace!"); |
872037bb | 671 | // return (void *)1; |
3a7b90de PMF |
672 | // } |
673 | // | |
674 | // for(i=0; i<trace->nr_channels; i++) { | |
675 | // struct rchan *rchan = trace->channels[i].trans_channel_data; | |
676 | // int fd; | |
677 | // | |
678 | // if(!strcmp(trace->channels[i].channel_name, channel_name)) { | |
679 | // struct rchan_buf *rbuf = rchan->buf; | |
680 | // struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; | |
681 | // | |
682 | // result = fd = ustcomm_app_detach_client(&ustcomm_app, &src); | |
683 | // if(result == -1) { | |
684 | // ERR("ustcomm_app_detach_client failed"); | |
685 | // goto next_cmd; | |
686 | // } | |
687 | // | |
688 | // lttbuf->wake_consumer_arg = (void *) fd; | |
689 | // | |
690 | // smp_wmb(); | |
691 | // | |
692 | // lttbuf->call_wake_consumer = 1; | |
693 | // | |
694 | // break; | |
695 | // } | |
696 | // } | |
697 | // | |
698 | // free(channel_name); | |
699 | // } | |
688760ef PMF |
700 | else { |
701 | ERR("unable to parse message: %s", recvbuf); | |
702 | } | |
d0b5f2b9 | 703 | |
811e4b93 | 704 | next_cmd: |
d0b5f2b9 | 705 | free(recvbuf); |
98963de4 PMF |
706 | } |
707 | } | |
708 | ||
4440ebcb PMF |
709 | int have_listener = 0; |
710 | ||
98963de4 PMF |
711 | void create_listener(void) |
712 | { | |
9160b4e4 | 713 | #ifdef USE_CLONE |
98963de4 | 714 | static char listener_stack[16384]; |
4440ebcb PMF |
715 | #else |
716 | pthread_t thread; | |
9160b4e4 | 717 | #endif |
98963de4 | 718 | |
4440ebcb PMF |
719 | if(have_listener) |
720 | return; | |
721 | ||
3847c3ba | 722 | #ifdef USE_CLONE |
fbd8191b | 723 | result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
98963de4 PMF |
724 | if(result == -1) { |
725 | perror("clone"); | |
4440ebcb | 726 | return; |
98963de4 | 727 | } |
3847c3ba | 728 | #else |
b0540e11 | 729 | |
3847c3ba PMF |
730 | pthread_create(&thread, NULL, listener_main, NULL); |
731 | #endif | |
4440ebcb PMF |
732 | |
733 | have_listener = 1; | |
98963de4 PMF |
734 | } |
735 | ||
d0b5f2b9 PMF |
736 | /* The signal handler itself. Signals must be setup so there cannot be |
737 | nested signals. */ | |
68c1021b PMF |
738 | |
739 | void sighandler(int sig) | |
740 | { | |
d0b5f2b9 | 741 | static char have_listener = 0; |
68c1021b | 742 | DBG("sighandler"); |
d0b5f2b9 PMF |
743 | |
744 | if(!have_listener) { | |
745 | create_listener(); | |
746 | have_listener = 1; | |
747 | } | |
68c1021b PMF |
748 | } |
749 | ||
750 | /* Called by the app signal handler to chain it to us. */ | |
751 | ||
98963de4 | 752 | void chain_signal(void) |
68c1021b PMF |
753 | { |
754 | sighandler(USTSIGNAL); | |
755 | } | |
756 | ||
98963de4 | 757 | static int init_socket(void) |
68c1021b | 758 | { |
d0b5f2b9 | 759 | return ustcomm_init_app(getpid(), &ustcomm_app); |
68c1021b PMF |
760 | } |
761 | ||
9160b4e4 PMF |
762 | /* FIXME: reenable this to delete socket file. */ |
763 | ||
764 | #if 0 | |
98963de4 | 765 | static void destroy_socket(void) |
68c1021b | 766 | { |
9160b4e4 PMF |
767 | int result; |
768 | ||
769 | if(mysocketfile[0] == '\0') | |
770 | return; | |
771 | ||
772 | result = unlink(mysocketfile); | |
773 | if(result == -1) { | |
774 | PERROR("unlink"); | |
775 | } | |
68c1021b | 776 | } |
9160b4e4 | 777 | #endif |
68c1021b | 778 | |
98963de4 | 779 | static int init_signal_handler(void) |
68c1021b PMF |
780 | { |
781 | /* Attempt to handler SIGIO. If the main program wants to | |
782 | * handle it, fine, it'll override us. They it'll have to | |
783 | * use the chaining function. | |
784 | */ | |
785 | ||
786 | int result; | |
787 | struct sigaction act; | |
788 | ||
789 | result = sigemptyset(&act.sa_mask); | |
790 | if(result == -1) { | |
791 | PERROR("sigemptyset"); | |
792 | return -1; | |
793 | } | |
794 | ||
795 | act.sa_handler = sighandler; | |
796 | act.sa_flags = SA_RESTART; | |
797 | ||
798 | /* Only defer ourselves. Also, try to restart interrupted | |
799 | * syscalls to disturb the traced program as little as possible. | |
800 | */ | |
801 | result = sigaction(SIGIO, &act, NULL); | |
802 | if(result == -1) { | |
803 | PERROR("sigaction"); | |
804 | return -1; | |
805 | } | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
5de74e51 PMF |
810 | #define AUTOPROBE_DISABLED 0 |
811 | #define AUTOPROBE_ENABLE_ALL 1 | |
812 | #define AUTOPROBE_ENABLE_REGEX 2 | |
813 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
814 | static regex_t autoprobe_regex; | |
ef290fca | 815 | |
20b37a31 | 816 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
817 | { |
818 | int result; | |
819 | ||
5de74e51 PMF |
820 | char* concat_name = NULL; |
821 | const char *probe_name = "default"; | |
ef290fca | 822 | |
5de74e51 | 823 | if(autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca PMF |
824 | return; |
825 | } | |
5de74e51 PMF |
826 | else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
827 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); | |
828 | if(result == -1) { | |
829 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", | |
830 | m->channel, m->name); | |
831 | return; | |
832 | } | |
833 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
834 | free(concat_name); | |
835 | return; | |
836 | } | |
837 | free(concat_name); | |
ef290fca PMF |
838 | } |
839 | ||
5de74e51 | 840 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
acbf228b PMF |
841 | if(result && result != -EEXIST) |
842 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); | |
20b37a31 | 843 | |
5de74e51 | 844 | DBG("auto connected marker %s %s to probe default", m->channel, m->name); |
ef290fca | 845 | |
20b37a31 PMF |
846 | } |
847 | ||
848 | static void __attribute__((constructor(1000))) init() | |
849 | { | |
850 | int result; | |
5de74e51 | 851 | char* autoprobe_val = NULL; |
20b37a31 | 852 | |
4440ebcb PMF |
853 | /* Initialize RCU in case the constructor order is not good. */ |
854 | urcu_init(); | |
855 | ||
856 | /* It is important to do this before events start to be generated. */ | |
857 | ust_register_thread(); | |
858 | ||
5de74e51 | 859 | DBG("Tracectl constructor"); |
20b37a31 | 860 | |
3847c3ba PMF |
861 | /* Must create socket before signal handler to prevent races. |
862 | */ | |
863 | result = init_socket(); | |
864 | if(result == -1) { | |
865 | ERR("init_socket error"); | |
866 | return; | |
867 | } | |
868 | result = init_signal_handler(); | |
869 | if(result == -1) { | |
870 | ERR("init_signal_handler error"); | |
871 | return; | |
872 | } | |
68c1021b | 873 | |
5de74e51 PMF |
874 | autoprobe_val = getenv("UST_AUTOPROBE"); |
875 | if(autoprobe_val) { | |
4440ebcb PMF |
876 | struct marker_iter iter; |
877 | ||
5de74e51 | 878 | DBG("Autoprobe enabled.\n"); |
4440ebcb PMF |
879 | |
880 | /* Ensure markers are initialized */ | |
881 | //init_markers(); | |
882 | ||
883 | /* Ensure marker control is initialized, for the probe */ | |
884 | init_marker_control(); | |
885 | ||
886 | /* first, set the callback that will connect the | |
887 | * probe on new markers | |
888 | */ | |
5de74e51 PMF |
889 | if(autoprobe_val[0] == '/') { |
890 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); | |
891 | if (result) { | |
892 | char regexerr[150]; | |
893 | ||
894 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
895 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
896 | /* don't crash the application just for this */ | |
897 | } | |
898 | else { | |
899 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; | |
900 | } | |
ef290fca | 901 | } |
5de74e51 PMF |
902 | else { |
903 | /* just enable all instrumentation */ | |
904 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
905 | } | |
906 | ||
907 | marker_set_new_marker_cb(auto_probe_connect); | |
908 | ||
4440ebcb PMF |
909 | /* Now, connect the probes that were already registered. */ |
910 | marker_iter_reset(&iter); | |
911 | marker_iter_start(&iter); | |
912 | ||
913 | DBG("now iterating on markers already registered\n"); | |
914 | while(iter.marker) { | |
915 | DBG("now iterating on marker %s\n", iter.marker->name); | |
916 | auto_probe_connect(iter.marker); | |
917 | marker_iter_next(&iter); | |
918 | } | |
919 | } | |
920 | ||
4db647c5 PMF |
921 | if(getenv("UST_TRACE")) { |
922 | char trace_name[] = "auto"; | |
923 | char trace_type[] = "ustrelay"; | |
924 | ||
925 | DBG("starting early tracing"); | |
926 | ||
927 | /* Ensure marker control is initialized */ | |
928 | init_marker_control(); | |
929 | ||
930 | /* Ensure relay is initialized */ | |
931 | init_ustrelay_transport(); | |
932 | ||
933 | /* Ensure markers are initialized */ | |
934 | init_markers(); | |
935 | ||
20b37a31 PMF |
936 | /* In case. */ |
937 | ltt_channels_register("ust"); | |
4db647c5 PMF |
938 | |
939 | result = ltt_trace_setup(trace_name); | |
940 | if(result < 0) { | |
941 | ERR("ltt_trace_setup failed"); | |
942 | return; | |
943 | } | |
944 | ||
945 | result = ltt_trace_set_type(trace_name, trace_type); | |
946 | if(result < 0) { | |
947 | ERR("ltt_trace_set_type failed"); | |
948 | return; | |
949 | } | |
950 | ||
951 | result = ltt_trace_alloc(trace_name); | |
952 | if(result < 0) { | |
953 | ERR("ltt_trace_alloc failed"); | |
954 | return; | |
955 | } | |
956 | ||
957 | result = ltt_trace_start(trace_name); | |
958 | if(result < 0) { | |
959 | ERR("ltt_trace_start failed"); | |
960 | return; | |
961 | } | |
3847c3ba | 962 | inform_consumer_daemon(); |
4db647c5 PMF |
963 | } |
964 | ||
68c1021b PMF |
965 | |
966 | return; | |
967 | ||
968 | /* should decrementally destroy stuff if error */ | |
969 | ||
970 | } | |
971 | ||
972 | /* This is only called if we terminate normally, not with an unhandled signal, | |
973 | * so we cannot rely on it. */ | |
974 | ||
899b5967 PMF |
975 | /* This destructor probably isn't needed, because ustd can do crash recovery. */ |
976 | #if 0 | |
98963de4 | 977 | static void __attribute__((destructor)) fini() |
68c1021b | 978 | { |
a584bc4e PMF |
979 | int result; |
980 | ||
981 | /* if trace running, finish it */ | |
982 | ||
983 | DBG("destructor stopping traces"); | |
984 | ||
985 | result = ltt_trace_stop("auto"); | |
986 | if(result == -1) { | |
987 | ERR("ltt_trace_stop error"); | |
988 | } | |
989 | ||
990 | result = ltt_trace_destroy("auto"); | |
991 | if(result == -1) { | |
992 | ERR("ltt_trace_destroy error"); | |
993 | } | |
994 | ||
68c1021b PMF |
995 | destroy_socket(); |
996 | } | |
899b5967 | 997 | #endif |
1e2944cb | 998 | |
97d9b88b PMF |
999 | #if 0 |
1000 | static int trace_recording(void) | |
1001 | { | |
1002 | int retval = 0; | |
1003 | struct ltt_trace_struct *trace; | |
1004 | ||
1005 | ltt_lock_traces(); | |
1006 | ||
1007 | list_for_each_entry(trace, <t_traces.head, list) { | |
1008 | if(trace->active) { | |
1009 | retval = 1; | |
1010 | break; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | ltt_unlock_traces(); | |
1015 | ||
1016 | return retval; | |
1017 | } | |
1018 | ||
1019 | static int have_consumer(void) | |
1020 | { | |
1021 | return !list_empty(&blocked_consumers); | |
1022 | } | |
1023 | ||
1024 | /* This destructor keeps the process alive for a few seconds in order | |
1025 | * to leave time to ustd to consume its buffers. | |
1026 | */ | |
1027 | ||
1028 | int restarting_sleep(int secs) | |
1029 | { | |
1030 | struct timespec tv; | |
1031 | int result; | |
1032 | ||
1033 | tv.tv_sec = secs; | |
1034 | tv.tv_nsec = 0; | |
1035 | ||
1036 | do { | |
1037 | result = nanosleep(&tv, &tv); | |
1038 | } while(result == -1 && errno == EINTR); | |
1039 | ||
1040 | return result; | |
1041 | } | |
1042 | ||
1043 | static void __attribute__((destructor)) keepalive() | |
1044 | { | |
1045 | // struct ustcomm_ustd ustd; | |
1046 | // int result; | |
1047 | // sigset_t sigset; | |
1048 | // | |
1049 | // result = sigemptyset(&sigset); | |
1050 | // if(result == -1) { | |
1051 | // perror("sigemptyset"); | |
1052 | // return; | |
1053 | // } | |
1054 | // result = sigaddset(&sigset, SIGIO); | |
1055 | // if(result == -1) { | |
1056 | // perror("sigaddset"); | |
1057 | // return; | |
1058 | // } | |
1059 | // result = sigprocmask(SIG_BLOCK, &sigset, NULL); | |
1060 | // if(result == -1) { | |
1061 | // perror("sigprocmask"); | |
1062 | // return; | |
1063 | // } | |
1064 | // | |
1065 | // if(trace_recording()) { | |
1066 | // if(!have_consumer()) { | |
1067 | // /* Request listener creation. We've blocked SIGIO's in | |
1068 | // * order to not interrupt sleep(), so we will miss the | |
1069 | // * one sent by the daemon and therefore won't create | |
1070 | // * the listener automatically. | |
1071 | // */ | |
1072 | // create_listener(); | |
1073 | // | |
1074 | printf("Keeping process alive for consumer daemon...\n"); | |
1075 | restarting_sleep(3); | |
1076 | printf("Finally dying...\n"); | |
1077 | // } | |
1078 | // } | |
1079 | // | |
1080 | // result = sigprocmask(SIG_UNBLOCK, &sigset, NULL); | |
1081 | // if(result == -1) { | |
1082 | // perror("sigprocmask"); | |
1083 | // return; | |
1084 | // } | |
1085 | } | |
1086 | #endif | |
1087 | ||
1e2944cb PMF |
1088 | /* Notify ust that there was a fork. This needs to be called inside |
1089 | * the new process, anytime a process whose memory is not shared with | |
1090 | * the parent is created. If this function is not called, the events | |
1091 | * of the new process will not be collected. | |
1092 | */ | |
1093 | ||
1094 | void ust_fork(void) | |
1095 | { | |
1096 | DBG("ust: forking"); | |
1097 | ltt_trace_stop("auto"); | |
1098 | ltt_trace_destroy("auto"); | |
1099 | ltt_trace_alloc("auto"); | |
1100 | ltt_trace_start("auto"); | |
1101 | init_socket(); | |
1102 | have_listener = 0; | |
1103 | create_listener(); | |
1104 | ustcomm_request_consumer(getpid(), "metadata"); | |
1105 | ustcomm_request_consumer(getpid(), "ust"); | |
1106 | } | |
1107 |