Commit | Line | Data |
---|---|---|
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 | 28 | #include <signal.h> |
4723ca09 NC |
29 | #include <sys/epoll.h> |
30 | #include <sys/time.h> | |
68c1021b PMF |
31 | #include <sys/types.h> |
32 | #include <sys/socket.h> | |
a584bc4e | 33 | #include <fcntl.h> |
3a7b90de | 34 | #include <poll.h> |
ef290fca | 35 | #include <regex.h> |
b102c2b0 | 36 | #include <urcu/uatomic_arch.h> |
4723ca09 | 37 | #include <urcu/list.h> |
fbd8191b | 38 | |
93d0f2ea | 39 | #include <ust/marker.h> |
a3adfb05 | 40 | #include <ust/tracepoint.h> |
616ed36a | 41 | #include <ust/tracectl.h> |
c93858f1 | 42 | #include "tracer.h" |
6af64c43 | 43 | #include "usterr.h" |
d0b5f2b9 | 44 | #include "ustcomm.h" |
b73a4c47 | 45 | #include "buffers.h" |
9160b4e4 | 46 | #include "marker-control.h" |
fbd8191b | 47 | |
ed1317e7 PMF |
48 | /* This should only be accessed by the constructor, before the creation |
49 | * of the listener, and then only by the listener. | |
50 | */ | |
51 | s64 pidunique = -1LL; | |
52 | ||
72098143 NC |
53 | static struct ustcomm_header _receive_header; |
54 | static struct ustcomm_header *receive_header = &_receive_header; | |
55 | static char receive_buffer[USTCOMM_BUFFER_SIZE]; | |
56 | static char send_buffer[USTCOMM_BUFFER_SIZE]; | |
57 | ||
4723ca09 NC |
58 | static int epoll_fd; |
59 | static struct ustcomm_sock *listen_sock; | |
223f2e7c | 60 | |
4723ca09 | 61 | extern struct chan_info_struct chan_infos[]; |
3a7b90de | 62 | |
4723ca09 | 63 | static struct list_head open_buffers_list = LIST_HEAD_INIT(open_buffers_list); |
d0b5f2b9 | 64 | |
4723ca09 | 65 | static struct list_head ust_socks = LIST_HEAD_INIT(ust_socks); |
68c1021b | 66 | |
f293009f | 67 | /* volatile because shared between the listener and the main thread */ |
8649cd59 | 68 | int buffers_to_export = 0; |
f293009f | 69 | |
ed1317e7 PMF |
70 | static long long make_pidunique(void) |
71 | { | |
72 | s64 retval; | |
73 | struct timeval tv; | |
72098143 | 74 | |
ed1317e7 PMF |
75 | gettimeofday(&tv, NULL); |
76 | ||
77 | retval = tv.tv_sec; | |
78 | retval <<= 32; | |
79 | retval |= tv.tv_usec; | |
80 | ||
81 | return retval; | |
82 | } | |
83 | ||
52c51a47 | 84 | static void print_markers(FILE *fp) |
fbd8191b PMF |
85 | { |
86 | struct marker_iter iter; | |
87 | ||
d0b5f2b9 | 88 | lock_markers(); |
fbd8191b PMF |
89 | marker_iter_reset(&iter); |
90 | marker_iter_start(&iter); | |
91 | ||
e9b58dc0 | 92 | while (iter.marker) { |
4723ca09 NC |
93 | fprintf(fp, "marker: %s/%s %d \"%s\" %p\n", |
94 | iter.marker->channel, | |
95 | iter.marker->name, | |
96 | (int)imv_read(iter.marker->state), | |
97 | iter.marker->format, | |
98 | iter.marker->location); | |
fbd8191b PMF |
99 | marker_iter_next(&iter); |
100 | } | |
d0b5f2b9 | 101 | unlock_markers(); |
fbd8191b PMF |
102 | } |
103 | ||
a3adfb05 NC |
104 | static void print_trace_events(FILE *fp) |
105 | { | |
106 | struct trace_event_iter iter; | |
107 | ||
108 | lock_trace_events(); | |
109 | trace_event_iter_reset(&iter); | |
110 | trace_event_iter_start(&iter); | |
111 | ||
e9b58dc0 | 112 | while (iter.trace_event) { |
a3adfb05 NC |
113 | fprintf(fp, "trace_event: %s\n", iter.trace_event->name); |
114 | trace_event_iter_next(&iter); | |
115 | } | |
116 | unlock_trace_events(); | |
117 | } | |
118 | ||
72098143 NC |
119 | static int connect_ustd(void) |
120 | { | |
121 | int result, fd; | |
122 | char default_daemon_path[] = SOCK_DIR "/ustd"; | |
123 | char *explicit_daemon_path, *daemon_path; | |
124 | ||
125 | explicit_daemon_path = getenv("UST_DAEMON_SOCKET"); | |
126 | if (explicit_daemon_path) { | |
127 | daemon_path = explicit_daemon_path; | |
128 | } else { | |
129 | daemon_path = default_daemon_path; | |
130 | } | |
131 | ||
132 | DBG("Connecting to daemon_path %s", daemon_path); | |
133 | ||
134 | result = ustcomm_connect_path(daemon_path, &fd); | |
135 | if (result < 0) { | |
136 | WARN("connect_ustd failed, daemon_path: %s", | |
137 | daemon_path); | |
138 | return result; | |
139 | } | |
140 | ||
141 | return fd; | |
142 | } | |
143 | ||
144 | ||
145 | static void request_buffer_consumer(int sock, | |
146 | const char *channel, | |
147 | int cpu) | |
148 | { | |
149 | struct ustcomm_header send_header, recv_header; | |
150 | struct ustcomm_buffer_info buf_inf; | |
151 | int result = 0; | |
152 | ||
153 | result = ustcomm_pack_buffer_info(&send_header, | |
154 | &buf_inf, | |
155 | channel, | |
156 | cpu); | |
157 | ||
158 | if (result < 0) { | |
159 | ERR("failed to pack buffer info message %s_%d", | |
160 | channel, cpu); | |
161 | return; | |
162 | } | |
163 | ||
164 | buf_inf.pid = getpid(); | |
165 | send_header.command = CONSUME_BUFFER; | |
166 | ||
167 | result = ustcomm_req(sock, &send_header, (char *) &buf_inf, | |
168 | &recv_header, NULL); | |
169 | if (result <= 0) { | |
170 | PERROR("request for buffer consumer failed, is the daemon online?"); | |
171 | } | |
172 | ||
173 | return; | |
174 | } | |
175 | ||
ad45e833 PMF |
176 | /* Ask the daemon to collect a trace called trace_name and being |
177 | * produced by this pid. | |
178 | * | |
179 | * The trace must be at least allocated. (It can also be started.) | |
180 | * This is because _ltt_trace_find is used. | |
181 | */ | |
182 | ||
183 | static void inform_consumer_daemon(const char *trace_name) | |
d0b5f2b9 | 184 | { |
72098143 | 185 | int sock, i,j; |
b73a4c47 | 186 | struct ust_trace *trace; |
72098143 NC |
187 | const char *ch_name; |
188 | ||
189 | sock = connect_ustd(); | |
190 | if (sock < 0) { | |
191 | return; | |
192 | } | |
193 | ||
194 | DBG("Connected to ustd"); | |
ad45e833 PMF |
195 | |
196 | ltt_lock_traces(); | |
197 | ||
198 | trace = _ltt_trace_find(trace_name); | |
e9b58dc0 | 199 | if (trace == NULL) { |
ad45e833 | 200 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); |
72098143 | 201 | goto unlock_traces; |
ad45e833 PMF |
202 | } |
203 | ||
e9b58dc0 DS |
204 | for (i=0; i < trace->nr_channels; i++) { |
205 | if (trace->channels[i].request_collection) { | |
8649cd59 | 206 | /* iterate on all cpus */ |
e9b58dc0 | 207 | for (j=0; j<trace->channels[i].n_cpus; j++) { |
72098143 NC |
208 | ch_name = trace->channels[i].channel_name; |
209 | request_buffer_consumer(sock, ch_name, j); | |
210 | STORE_SHARED(buffers_to_export, | |
211 | LOAD_SHARED(buffers_to_export)+1); | |
204141ee | 212 | } |
ad45e833 PMF |
213 | } |
214 | } | |
215 | ||
72098143 | 216 | unlock_traces: |
ad45e833 | 217 | ltt_unlock_traces(); |
204141ee | 218 | |
72098143 | 219 | close(sock); |
204141ee PMF |
220 | } |
221 | ||
72098143 NC |
222 | static struct ust_channel *find_channel(const char *ch_name, |
223 | struct ust_trace *trace) | |
204141ee | 224 | { |
204141ee | 225 | int i; |
204141ee | 226 | |
e9b58dc0 | 227 | for (i=0; i<trace->nr_channels; i++) { |
e9b58dc0 | 228 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
72098143 | 229 | return &trace->channels[i]; |
204141ee PMF |
230 | } |
231 | } | |
232 | ||
72098143 | 233 | return NULL; |
204141ee PMF |
234 | } |
235 | ||
72098143 NC |
236 | static int get_buffer_shmid_pipe_fd(const char *trace_name, const char *ch_name, |
237 | int ch_cpu, | |
238 | int *buf_shmid, | |
239 | int *buf_struct_shmid, | |
240 | int *buf_pipe_fd) | |
204141ee | 241 | { |
b73a4c47 | 242 | struct ust_trace *trace; |
72098143 NC |
243 | struct ust_channel *channel; |
244 | struct ust_buffer *buf; | |
204141ee | 245 | |
72098143 | 246 | DBG("get_buffer_shmid_pipe_fd"); |
204141ee PMF |
247 | |
248 | ltt_lock_traces(); | |
249 | trace = _ltt_trace_find(trace_name); | |
250 | ltt_unlock_traces(); | |
251 | ||
e9b58dc0 | 252 | if (trace == NULL) { |
204141ee | 253 | ERR("cannot find trace!"); |
72098143 | 254 | return -ENODATA; |
204141ee PMF |
255 | } |
256 | ||
72098143 NC |
257 | channel = find_channel(ch_name, trace); |
258 | if (!channel) { | |
259 | ERR("cannot find channel %s!", ch_name); | |
260 | return -ENODATA; | |
204141ee PMF |
261 | } |
262 | ||
72098143 | 263 | buf = channel->buf[ch_cpu]; |
204141ee | 264 | |
72098143 NC |
265 | *buf_shmid = buf->shmid; |
266 | *buf_struct_shmid = channel->buf_struct_shmids[ch_cpu]; | |
267 | *buf_pipe_fd = buf->data_ready_fd_read; | |
268 | ||
269 | return 0; | |
204141ee PMF |
270 | } |
271 | ||
72098143 NC |
272 | static int get_subbuf_num_size(const char *trace_name, const char *ch_name, |
273 | int *num, int *size) | |
204141ee | 274 | { |
b73a4c47 | 275 | struct ust_trace *trace; |
72098143 | 276 | struct ust_channel *channel; |
204141ee PMF |
277 | |
278 | DBG("get_subbuf_size"); | |
279 | ||
204141ee PMF |
280 | ltt_lock_traces(); |
281 | trace = _ltt_trace_find(trace_name); | |
282 | ltt_unlock_traces(); | |
283 | ||
72098143 | 284 | if (!trace) { |
204141ee | 285 | ERR("cannot find trace!"); |
72098143 | 286 | return -ENODATA; |
204141ee PMF |
287 | } |
288 | ||
72098143 NC |
289 | channel = find_channel(ch_name, trace); |
290 | if (!channel) { | |
27e84572 | 291 | ERR("unable to find channel"); |
72098143 | 292 | return -ENODATA; |
204141ee PMF |
293 | } |
294 | ||
72098143 NC |
295 | *num = channel->subbuf_cnt; |
296 | *size = channel->subbuf_size; | |
204141ee | 297 | |
72098143 | 298 | return 0; |
204141ee PMF |
299 | } |
300 | ||
a80e6dd8 | 301 | /* Return the power of two which is equal or higher to v */ |
763f41e5 | 302 | |
a80e6dd8 PMF |
303 | static unsigned int pow2_higher_or_eq(unsigned int v) |
304 | { | |
305 | int hb = fls(v); | |
a80e6dd8 PMF |
306 | int retval = 1<<(hb-1); |
307 | ||
e9b58dc0 | 308 | if (v-retval == 0) |
a80e6dd8 PMF |
309 | return retval; |
310 | else | |
311 | return retval<<1; | |
763f41e5 DS |
312 | } |
313 | ||
72098143 NC |
314 | static int set_subbuf_size(const char *trace_name, const char *ch_name, |
315 | unsigned int size) | |
763f41e5 | 316 | { |
72098143 | 317 | unsigned int power; |
763f41e5 DS |
318 | int retval = 0; |
319 | struct ust_trace *trace; | |
72098143 | 320 | struct ust_channel *channel; |
763f41e5 DS |
321 | |
322 | DBG("set_subbuf_size"); | |
323 | ||
a80e6dd8 PMF |
324 | power = pow2_higher_or_eq(size); |
325 | power = max_t(unsigned int, 2u, power); | |
72098143 | 326 | if (power != size) { |
a80e6dd8 | 327 | WARN("using the next power of two for buffer size = %u\n", power); |
72098143 | 328 | } |
763f41e5 DS |
329 | |
330 | ltt_lock_traces(); | |
331 | trace = _ltt_trace_find_setup(trace_name); | |
e9b58dc0 | 332 | if (trace == NULL) { |
763f41e5 | 333 | ERR("cannot find trace!"); |
72098143 NC |
334 | retval = -ENODATA; |
335 | goto unlock_traces; | |
763f41e5 DS |
336 | } |
337 | ||
72098143 NC |
338 | channel = find_channel(ch_name, trace); |
339 | if (!channel) { | |
763f41e5 | 340 | ERR("unable to find channel"); |
72098143 NC |
341 | retval = -ENODATA; |
342 | goto unlock_traces; | |
763f41e5 DS |
343 | } |
344 | ||
72098143 NC |
345 | channel->subbuf_size = power; |
346 | DBG("the set_subbuf_size for the requested channel is %u", channel->subbuf_size); | |
347 | ||
348 | unlock_traces: | |
86dd0ebc | 349 | ltt_unlock_traces(); |
72098143 | 350 | |
763f41e5 DS |
351 | return retval; |
352 | } | |
353 | ||
72098143 NC |
354 | static int set_subbuf_num(const char *trace_name, const char *ch_name, |
355 | unsigned int num) | |
763f41e5 | 356 | { |
763f41e5 | 357 | struct ust_trace *trace; |
72098143 NC |
358 | struct ust_channel *channel; |
359 | int retval = 0; | |
763f41e5 DS |
360 | |
361 | DBG("set_subbuf_num"); | |
362 | ||
763f41e5 DS |
363 | if (num < 2) { |
364 | ERR("subbuffer count should be greater than 2"); | |
72098143 | 365 | return -EINVAL; |
763f41e5 DS |
366 | } |
367 | ||
368 | ltt_lock_traces(); | |
369 | trace = _ltt_trace_find_setup(trace_name); | |
e9b58dc0 | 370 | if (trace == NULL) { |
763f41e5 | 371 | ERR("cannot find trace!"); |
72098143 NC |
372 | retval = -ENODATA; |
373 | goto unlock_traces; | |
763f41e5 DS |
374 | } |
375 | ||
72098143 NC |
376 | channel = find_channel(ch_name, trace); |
377 | if (!channel) { | |
763f41e5 | 378 | ERR("unable to find channel"); |
72098143 NC |
379 | retval = -ENODATA; |
380 | goto unlock_traces; | |
763f41e5 DS |
381 | } |
382 | ||
72098143 NC |
383 | channel->subbuf_cnt = num; |
384 | DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt); | |
385 | ||
386 | unlock_traces: | |
86dd0ebc | 387 | ltt_unlock_traces(); |
763f41e5 DS |
388 | return retval; |
389 | } | |
390 | ||
72098143 NC |
391 | static int get_subbuffer(const char *trace_name, const char *ch_name, |
392 | int ch_cpu, long *consumed_old) | |
4723ca09 | 393 | { |
72098143 | 394 | int retval = 0; |
4723ca09 | 395 | struct ust_trace *trace; |
72098143 NC |
396 | struct ust_channel *channel; |
397 | struct ust_buffer *buf; | |
4723ca09 NC |
398 | |
399 | DBG("get_subbuf"); | |
400 | ||
72098143 | 401 | *consumed_old = 0; |
4723ca09 NC |
402 | |
403 | ltt_lock_traces(); | |
404 | trace = _ltt_trace_find(trace_name); | |
405 | ||
72098143 | 406 | if (!trace) { |
4723ca09 | 407 | DBG("Cannot find trace. It was likely destroyed by the user."); |
72098143 | 408 | retval = -ENODATA; |
4723ca09 NC |
409 | goto unlock_traces; |
410 | } | |
411 | ||
72098143 NC |
412 | channel = find_channel(ch_name, trace); |
413 | if (!channel) { | |
414 | ERR("unable to find channel"); | |
415 | retval = -ENODATA; | |
416 | goto unlock_traces; | |
4723ca09 | 417 | } |
4723ca09 | 418 | |
72098143 NC |
419 | buf = channel->buf[ch_cpu]; |
420 | ||
421 | retval = ust_buffers_get_subbuf(buf, consumed_old); | |
422 | if (retval < 0) { | |
423 | WARN("missed buffer?"); | |
4723ca09 NC |
424 | } |
425 | ||
72098143 | 426 | unlock_traces: |
4723ca09 NC |
427 | ltt_unlock_traces(); |
428 | ||
4723ca09 NC |
429 | return retval; |
430 | } | |
431 | ||
432 | ||
72098143 NC |
433 | static int notify_buffer_mapped(const char *trace_name, |
434 | const char *ch_name, | |
435 | int ch_cpu) | |
204141ee PMF |
436 | { |
437 | int retval = 0; | |
b73a4c47 | 438 | struct ust_trace *trace; |
72098143 NC |
439 | struct ust_channel *channel; |
440 | struct ust_buffer *buf; | |
204141ee | 441 | |
4723ca09 | 442 | DBG("get_buffer_fd"); |
204141ee | 443 | |
204141ee PMF |
444 | ltt_lock_traces(); |
445 | trace = _ltt_trace_find(trace_name); | |
204141ee | 446 | |
72098143 NC |
447 | if (!trace) { |
448 | retval = -ENODATA; | |
753e1b51 | 449 | DBG("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 450 | goto unlock_traces; |
204141ee PMF |
451 | } |
452 | ||
72098143 NC |
453 | channel = find_channel(ch_name, trace); |
454 | if (!channel) { | |
455 | retval = -ENODATA; | |
456 | ERR("unable to find channel"); | |
457 | goto unlock_traces; | |
458 | } | |
204141ee | 459 | |
72098143 | 460 | buf = channel->buf[ch_cpu]; |
d5adede0 | 461 | |
72098143 NC |
462 | /* Being here is the proof the daemon has mapped the buffer in its |
463 | * memory. We may now decrement buffers_to_export. | |
464 | */ | |
465 | if (uatomic_read(&buf->consumed) == 0) { | |
466 | DBG("decrementing buffers_to_export"); | |
467 | STORE_SHARED(buffers_to_export, LOAD_SHARED(buffers_to_export)-1); | |
204141ee PMF |
468 | } |
469 | ||
72098143 NC |
470 | /* The buffer has been exported, ergo, we can add it to the |
471 | * list of open buffers | |
472 | */ | |
473 | list_add(&buf->open_buffers_list, &open_buffers_list); | |
86dd0ebc | 474 | |
72098143 NC |
475 | unlock_traces: |
476 | ltt_unlock_traces(); | |
204141ee | 477 | |
204141ee PMF |
478 | return retval; |
479 | } | |
480 | ||
72098143 NC |
481 | static int put_subbuffer(const char *trace_name, const char *ch_name, |
482 | int ch_cpu, long consumed_old) | |
204141ee PMF |
483 | { |
484 | int retval = 0; | |
b73a4c47 | 485 | struct ust_trace *trace; |
72098143 NC |
486 | struct ust_channel *channel; |
487 | struct ust_buffer *buf; | |
204141ee PMF |
488 | |
489 | DBG("put_subbuf"); | |
490 | ||
204141ee PMF |
491 | ltt_lock_traces(); |
492 | trace = _ltt_trace_find(trace_name); | |
204141ee | 493 | |
72098143 NC |
494 | if (!trace) { |
495 | retval = -ENODATA; | |
753e1b51 | 496 | DBG("Cannot find trace. It was likely destroyed by the user."); |
86dd0ebc | 497 | goto unlock_traces; |
204141ee PMF |
498 | } |
499 | ||
72098143 NC |
500 | channel = find_channel(ch_name, trace); |
501 | if (!channel) { | |
502 | retval = -ENODATA; | |
503 | ERR("unable to find channel"); | |
504 | goto unlock_traces; | |
505 | } | |
204141ee | 506 | |
72098143 | 507 | buf = channel->buf[ch_cpu]; |
204141ee | 508 | |
72098143 NC |
509 | retval = ust_buffers_put_subbuf(buf, consumed_old); |
510 | if (retval < 0) { | |
511 | WARN("ust_buffers_put_subbuf: error (subbuf=%s_%d)", | |
512 | ch_name, ch_cpu); | |
513 | } else { | |
514 | DBG("ust_buffers_put_subbuf: success (subbuf=%s_%d)", | |
515 | ch_name, ch_cpu); | |
204141ee PMF |
516 | } |
517 | ||
72098143 | 518 | unlock_traces: |
86dd0ebc | 519 | ltt_unlock_traces(); |
72098143 | 520 | |
204141ee PMF |
521 | return retval; |
522 | } | |
523 | ||
fc253ce0 PMF |
524 | static void listener_cleanup(void *ptr) |
525 | { | |
4723ca09 | 526 | ustcomm_del_named_sock(listen_sock, 0); |
fc253ce0 PMF |
527 | } |
528 | ||
72098143 | 529 | static void force_subbuf_switch() |
b9318b35 | 530 | { |
4723ca09 | 531 | struct ust_buffer *buf; |
b9318b35 | 532 | |
4723ca09 NC |
533 | list_for_each_entry(buf, &open_buffers_list, |
534 | open_buffers_list) { | |
535 | ltt_force_switch(buf, FORCE_FLUSH); | |
b9318b35 AH |
536 | } |
537 | } | |
538 | ||
72098143 NC |
539 | /* Simple commands are those which need only respond with a return value. */ |
540 | static int process_simple_client_cmd(int command, char *recv_buf) | |
98963de4 PMF |
541 | { |
542 | int result; | |
0e4b45ac | 543 | char trace_type[] = "ustrelay"; |
72098143 | 544 | char trace_name[] = "auto"; |
a3adfb05 | 545 | |
72098143 NC |
546 | switch(command) { |
547 | case SET_SOCK_PATH: | |
548 | { | |
549 | struct ustcomm_sock_path *sock_msg; | |
550 | sock_msg = (struct ustcomm_sock_path *)recv_buf; | |
551 | sock_msg->sock_path = | |
552 | ustcomm_restore_ptr(sock_msg->sock_path, | |
553 | sock_msg->data, | |
554 | sizeof(sock_msg->data)); | |
555 | if (!sock_msg->sock_path) { | |
556 | ||
557 | return -EINVAL; | |
a3adfb05 | 558 | } |
72098143 NC |
559 | return setenv("UST_DAEMON_SOCKET", sock_msg->sock_path, 1); |
560 | } | |
561 | case START: | |
0e4b45ac PMF |
562 | /* start is an operation that setups the trace, allocates it and starts it */ |
563 | result = ltt_trace_setup(trace_name); | |
e9b58dc0 | 564 | if (result < 0) { |
0e4b45ac | 565 | ERR("ltt_trace_setup failed"); |
72098143 | 566 | return result; |
3a7b90de | 567 | } |
98963de4 | 568 | |
0e4b45ac | 569 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 570 | if (result < 0) { |
0e4b45ac | 571 | ERR("ltt_trace_set_type failed"); |
72098143 | 572 | return result; |
52c51a47 | 573 | } |
52c51a47 | 574 | |
0e4b45ac | 575 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 576 | if (result < 0) { |
0e4b45ac | 577 | ERR("ltt_trace_alloc failed"); |
72098143 | 578 | return result; |
52c51a47 | 579 | } |
52c51a47 | 580 | |
0e4b45ac | 581 | inform_consumer_daemon(trace_name); |
52c51a47 | 582 | |
0e4b45ac | 583 | result = ltt_trace_start(trace_name); |
e9b58dc0 | 584 | if (result < 0) { |
0e4b45ac | 585 | ERR("ltt_trace_start failed"); |
72098143 | 586 | return result; |
d0b5f2b9 | 587 | } |
72098143 NC |
588 | |
589 | return 0; | |
590 | case SETUP_TRACE: | |
0e4b45ac | 591 | DBG("trace setup"); |
d0b5f2b9 | 592 | |
0e4b45ac | 593 | result = ltt_trace_setup(trace_name); |
e9b58dc0 | 594 | if (result < 0) { |
0e4b45ac | 595 | ERR("ltt_trace_setup failed"); |
72098143 | 596 | return result; |
d0b5f2b9 | 597 | } |
d0b5f2b9 | 598 | |
0e4b45ac | 599 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 600 | if (result < 0) { |
0e4b45ac | 601 | ERR("ltt_trace_set_type failed"); |
72098143 | 602 | return result; |
d0b5f2b9 | 603 | } |
72098143 NC |
604 | |
605 | return 0; | |
606 | case ALLOC_TRACE: | |
0e4b45ac | 607 | DBG("trace alloc"); |
62ec620f | 608 | |
0e4b45ac | 609 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 610 | if (result < 0) { |
0e4b45ac | 611 | ERR("ltt_trace_alloc failed"); |
72098143 | 612 | return result; |
763f41e5 | 613 | } |
0e4b45ac | 614 | inform_consumer_daemon(trace_name); |
72098143 NC |
615 | |
616 | return 0; | |
617 | ||
618 | case CREATE_TRACE: | |
0e4b45ac | 619 | DBG("trace create"); |
d0b5f2b9 | 620 | |
0e4b45ac | 621 | result = ltt_trace_setup(trace_name); |
e9b58dc0 | 622 | if (result < 0) { |
0e4b45ac | 623 | ERR("ltt_trace_setup failed"); |
72098143 | 624 | return result; |
d0b5f2b9 | 625 | } |
d0b5f2b9 | 626 | |
0e4b45ac | 627 | result = ltt_trace_set_type(trace_name, trace_type); |
e9b58dc0 | 628 | if (result < 0) { |
0e4b45ac | 629 | ERR("ltt_trace_set_type failed"); |
72098143 | 630 | return result; |
d0b5f2b9 | 631 | } |
72098143 NC |
632 | |
633 | return 0; | |
634 | case START_TRACE: | |
0e4b45ac | 635 | DBG("trace start"); |
aafb1650 | 636 | |
0e4b45ac | 637 | result = ltt_trace_alloc(trace_name); |
e9b58dc0 | 638 | if (result < 0) { |
0e4b45ac | 639 | ERR("ltt_trace_alloc failed"); |
72098143 | 640 | return result; |
811e4b93 | 641 | } |
e9b58dc0 | 642 | if (!result) { |
0e4b45ac | 643 | inform_consumer_daemon(trace_name); |
811e4b93 | 644 | } |
0e4b45ac PMF |
645 | |
646 | result = ltt_trace_start(trace_name); | |
e9b58dc0 | 647 | if (result < 0) { |
0e4b45ac | 648 | ERR("ltt_trace_start failed"); |
72098143 | 649 | return result; |
3847c3ba | 650 | } |
72098143 NC |
651 | |
652 | return 0; | |
653 | case STOP_TRACE: | |
0e4b45ac | 654 | DBG("trace stop"); |
b02e31e5 | 655 | |
0e4b45ac | 656 | result = ltt_trace_stop(trace_name); |
e9b58dc0 | 657 | if (result < 0) { |
0e4b45ac | 658 | ERR("ltt_trace_stop failed"); |
72098143 | 659 | return result; |
0e4b45ac | 660 | } |
b02e31e5 | 661 | |
72098143 NC |
662 | return 0; |
663 | case DESTROY_TRACE: | |
0e4b45ac | 664 | DBG("trace destroy"); |
204141ee | 665 | |
0e4b45ac | 666 | result = ltt_trace_destroy(trace_name, 0); |
e9b58dc0 | 667 | if (result < 0) { |
0e4b45ac | 668 | ERR("ltt_trace_destroy failed"); |
72098143 | 669 | return result; |
763f41e5 | 670 | } |
72098143 NC |
671 | return 0; |
672 | case FORCE_SUBBUF_SWITCH: | |
673 | /* FIXME: return codes? */ | |
674 | force_subbuf_switch(); | |
52c51a47 | 675 | |
72098143 | 676 | break; |
52c51a47 | 677 | |
72098143 NC |
678 | default: |
679 | return -EINVAL; | |
680 | } | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
685 | static void process_channel_cmd(int sock, int command, | |
686 | struct ustcomm_channel_info *ch_inf) | |
687 | { | |
688 | struct ustcomm_header _reply_header; | |
689 | struct ustcomm_header *reply_header = &_reply_header; | |
690 | struct ustcomm_channel_info *reply_msg = | |
691 | (struct ustcomm_channel_info *)send_buffer; | |
692 | char trace_name[] = "auto"; | |
693 | int result, offset = 0, num, size; | |
694 | ||
695 | memset(reply_header, 0, sizeof(*reply_header)); | |
696 | ||
697 | switch (command) { | |
698 | case GET_SUBBUF_NUM_SIZE: | |
699 | result = get_subbuf_num_size(trace_name, | |
700 | ch_inf->channel, | |
701 | &num, &size); | |
702 | if (result < 0) { | |
703 | reply_header->result = result; | |
704 | break; | |
705 | } | |
706 | ||
707 | reply_msg->channel = USTCOMM_POISON_PTR; | |
708 | reply_msg->subbuf_num = num; | |
709 | reply_msg->subbuf_size = size; | |
710 | ||
711 | ||
712 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
713 | ||
714 | break; | |
715 | case SET_SUBBUF_NUM: | |
716 | reply_header->result = set_subbuf_num(trace_name, | |
717 | ch_inf->channel, | |
718 | ch_inf->subbuf_num); | |
719 | ||
720 | break; | |
721 | case SET_SUBBUF_SIZE: | |
722 | reply_header->result = set_subbuf_size(trace_name, | |
723 | ch_inf->channel, | |
724 | ch_inf->subbuf_size); | |
725 | ||
726 | ||
727 | break; | |
728 | } | |
729 | if (ustcomm_send(sock, reply_header, (char *)reply_msg) < 0) { | |
730 | ERR("ustcomm_send failed"); | |
731 | } | |
732 | } | |
733 | ||
734 | static void process_buffer_cmd(int sock, int command, | |
735 | struct ustcomm_buffer_info *buf_inf) | |
736 | { | |
737 | struct ustcomm_header _reply_header; | |
738 | struct ustcomm_header *reply_header = &_reply_header; | |
739 | struct ustcomm_buffer_info *reply_msg = | |
740 | (struct ustcomm_buffer_info *)send_buffer; | |
741 | char trace_name[] = "auto"; | |
742 | int result, offset = 0, buf_shmid, buf_struct_shmid, buf_pipe_fd; | |
743 | long consumed_old; | |
52c51a47 | 744 | |
72098143 NC |
745 | memset(reply_header, 0, sizeof(*reply_header)); |
746 | ||
747 | switch (command) { | |
748 | case GET_BUF_SHMID_PIPE_FD: | |
749 | result = get_buffer_shmid_pipe_fd(trace_name, buf_inf->channel, | |
750 | buf_inf->ch_cpu, | |
751 | &buf_shmid, | |
752 | &buf_struct_shmid, | |
753 | &buf_pipe_fd); | |
754 | if (result < 0) { | |
755 | reply_header->result = result; | |
756 | break; | |
52c51a47 | 757 | } |
52c51a47 | 758 | |
72098143 NC |
759 | reply_msg->channel = USTCOMM_POISON_PTR; |
760 | reply_msg->buf_shmid = buf_shmid; | |
761 | reply_msg->buf_struct_shmid = buf_struct_shmid; | |
762 | ||
763 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
764 | reply_header->fd_included = 1; | |
765 | ||
766 | if (ustcomm_send_fd(sock, reply_header, (char *)reply_msg, | |
767 | &buf_pipe_fd) < 0) { | |
768 | ERR("ustcomm_send failed"); | |
769 | } | |
770 | return; | |
771 | ||
772 | case NOTIFY_BUF_MAPPED: | |
773 | reply_header->result = | |
774 | notify_buffer_mapped(trace_name, | |
775 | buf_inf->channel, | |
776 | buf_inf->ch_cpu); | |
777 | break; | |
778 | case GET_SUBBUFFER: | |
779 | result = get_subbuffer(trace_name, buf_inf->channel, | |
780 | buf_inf->ch_cpu, &consumed_old); | |
e9b58dc0 | 781 | if (result < 0) { |
72098143 NC |
782 | reply_header->result = result; |
783 | break; | |
0e4b45ac | 784 | } |
c5ff938a | 785 | |
72098143 NC |
786 | reply_msg->channel = USTCOMM_POISON_PTR; |
787 | reply_msg->consumed_old = consumed_old; | |
788 | ||
789 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); | |
790 | ||
791 | break; | |
792 | case PUT_SUBBUFFER: | |
793 | result = put_subbuffer(trace_name, buf_inf->channel, | |
794 | buf_inf->ch_cpu, | |
795 | buf_inf->consumed_old); | |
796 | reply_header->result = result; | |
797 | ||
798 | break; | |
799 | } | |
800 | ||
801 | if (ustcomm_send(sock, reply_header, (char *)reply_msg) < 0) { | |
802 | ERR("ustcomm_send failed"); | |
803 | } | |
804 | ||
805 | } | |
806 | ||
807 | static void process_marker_cmd(int sock, int command, | |
808 | struct ustcomm_marker_info *marker_inf) | |
809 | { | |
810 | struct ustcomm_header _reply_header; | |
811 | struct ustcomm_header *reply_header = &_reply_header; | |
812 | int result; | |
52c51a47 | 813 | |
72098143 NC |
814 | memset(reply_header, 0, sizeof(*reply_header)); |
815 | ||
816 | switch(command) { | |
817 | case ENABLE_MARKER: | |
818 | ||
819 | result = ltt_marker_connect(marker_inf->channel, | |
820 | marker_inf->marker, | |
821 | "default"); | |
822 | if (result < 0) { | |
823 | WARN("could not enable marker; channel=%s," | |
824 | " name=%s", | |
825 | marker_inf->channel, | |
826 | marker_inf->marker); | |
52c51a47 | 827 | |
52c51a47 | 828 | } |
72098143 NC |
829 | break; |
830 | case DISABLE_MARKER: | |
831 | result = ltt_marker_disconnect(marker_inf->channel, | |
832 | marker_inf->marker, | |
833 | "default"); | |
834 | if (result < 0) { | |
835 | WARN("could not disable marker; channel=%s," | |
836 | " name=%s", | |
837 | marker_inf->channel, | |
838 | marker_inf->marker); | |
839 | } | |
840 | break; | |
841 | } | |
ed1317e7 | 842 | |
72098143 NC |
843 | reply_header->result = result; |
844 | ||
845 | if (ustcomm_send(sock, reply_header, NULL) < 0) { | |
846 | ERR("ustcomm_send failed"); | |
847 | } | |
848 | ||
849 | } | |
850 | static void process_client_cmd(struct ustcomm_header *recv_header, | |
851 | char *recv_buf, int sock) | |
852 | { | |
853 | int result; | |
854 | struct ustcomm_header _reply_header; | |
855 | struct ustcomm_header *reply_header = &_reply_header; | |
856 | char *send_buf = send_buffer; | |
857 | ||
858 | memset(reply_header, 0, sizeof(*reply_header)); | |
859 | memset(send_buf, 0, sizeof(send_buffer)); | |
860 | ||
861 | switch(recv_header->command) { | |
862 | case GET_SUBBUF_NUM_SIZE: | |
863 | case SET_SUBBUF_NUM: | |
864 | case SET_SUBBUF_SIZE: | |
865 | { | |
866 | struct ustcomm_channel_info *ch_inf; | |
867 | ch_inf = (struct ustcomm_channel_info *)recv_buf; | |
868 | result = ustcomm_unpack_channel_info(ch_inf); | |
869 | if (result < 0) { | |
870 | ERR("couldn't unpack channel info"); | |
871 | reply_header->result = -EINVAL; | |
872 | goto send_response; | |
873 | } | |
874 | process_channel_cmd(sock, recv_header->command, ch_inf); | |
875 | return; | |
876 | } | |
877 | case GET_BUF_SHMID_PIPE_FD: | |
878 | case NOTIFY_BUF_MAPPED: | |
879 | case GET_SUBBUFFER: | |
880 | case PUT_SUBBUFFER: | |
881 | { | |
882 | struct ustcomm_buffer_info *buf_inf; | |
883 | buf_inf = (struct ustcomm_buffer_info *)recv_buf; | |
884 | result = ustcomm_unpack_buffer_info(buf_inf); | |
885 | if (result < 0) { | |
886 | ERR("couldn't unpack buffer info"); | |
887 | reply_header->result = -EINVAL; | |
888 | goto send_response; | |
889 | } | |
890 | process_buffer_cmd(sock, recv_header->command, buf_inf); | |
891 | return; | |
892 | } | |
893 | case ENABLE_MARKER: | |
894 | case DISABLE_MARKER: | |
895 | { | |
896 | struct ustcomm_marker_info *marker_inf; | |
897 | marker_inf = (struct ustcomm_marker_info *)recv_buf; | |
898 | result = ustcomm_unpack_marker_info(marker_inf); | |
e9b58dc0 | 899 | if (result < 0) { |
72098143 NC |
900 | ERR("couldn't unpack marker info"); |
901 | reply_header->result = -EINVAL; | |
902 | goto send_response; | |
0e4b45ac | 903 | } |
72098143 NC |
904 | process_marker_cmd(sock, recv_header->command, marker_inf); |
905 | return; | |
906 | } | |
907 | case LIST_MARKERS: | |
908 | { | |
909 | char *ptr; | |
910 | size_t size; | |
911 | FILE *fp; | |
c5ff938a | 912 | |
72098143 NC |
913 | fp = open_memstream(&ptr, &size); |
914 | if (fp == NULL) { | |
915 | ERR("opening memstream failed"); | |
916 | return; | |
917 | } | |
918 | print_markers(fp); | |
919 | fclose(fp); | |
ed1317e7 | 920 | |
72098143 NC |
921 | reply_header->size = size; |
922 | ||
923 | result = ustcomm_send(sock, reply_header, ptr); | |
924 | ||
925 | free(ptr); | |
926 | ||
927 | if (result < 0) { | |
928 | PERROR("failed to send markers list"); | |
929 | } | |
930 | ||
931 | break; | |
932 | } | |
933 | case LIST_TRACE_EVENTS: | |
934 | { | |
935 | char *ptr; | |
936 | size_t size; | |
937 | FILE *fp; | |
938 | ||
939 | fp = open_memstream(&ptr, &size); | |
940 | if (fp == NULL) { | |
941 | ERR("opening memstream failed"); | |
942 | return; | |
08b8805e | 943 | } |
72098143 NC |
944 | print_trace_events(fp); |
945 | fclose(fp); | |
946 | ||
947 | reply_header->size = size; | |
948 | ||
949 | result = ustcomm_send(sock, reply_header, ptr); | |
ed1317e7 | 950 | |
72098143 NC |
951 | free(ptr); |
952 | ||
953 | if (result < 0) { | |
954 | ERR("list_trace_events failed"); | |
955 | return; | |
ed1317e7 | 956 | } |
0e4b45ac | 957 | |
72098143 NC |
958 | break; |
959 | } | |
960 | case LOAD_PROBE_LIB: | |
961 | { | |
962 | char *libfile; | |
963 | ||
964 | /* FIXME: No functionality at all... */ | |
965 | libfile = recv_buf; | |
966 | ||
967 | DBG("load_probe_lib loading %s", libfile); | |
968 | ||
969 | break; | |
970 | } | |
971 | case GET_PIDUNIQUE: | |
972 | { | |
973 | struct ustcomm_pidunique *pid_msg; | |
974 | pid_msg = (struct ustcomm_pidunique *)send_buf; | |
975 | ||
976 | pid_msg->pidunique = pidunique; | |
977 | reply_header->size = sizeof(pid_msg); | |
978 | ||
979 | goto send_response; | |
980 | ||
981 | } | |
982 | case GET_SOCK_PATH: | |
983 | { | |
984 | struct ustcomm_sock_path *sock_msg; | |
985 | char *sock_path_env; | |
986 | ||
987 | sock_msg = (struct ustcomm_sock_path *)send_buf; | |
988 | ||
989 | sock_path_env = getenv("UST_DAEMON_SOCKET"); | |
990 | ||
991 | if (!sock_path_env) { | |
992 | result = ustcomm_pack_sock_path(reply_header, | |
993 | sock_msg, | |
994 | SOCK_DIR "/ustd"); | |
995 | ||
e9b58dc0 | 996 | } else { |
72098143 NC |
997 | result = ustcomm_pack_sock_path(reply_header, |
998 | sock_msg, | |
999 | sock_path_env); | |
b2fb2f91 | 1000 | } |
72098143 NC |
1001 | reply_header->result = result; |
1002 | ||
1003 | goto send_response; | |
0e4b45ac | 1004 | } |
72098143 NC |
1005 | default: |
1006 | reply_header->result = | |
1007 | process_simple_client_cmd(recv_header->command, | |
1008 | recv_buf); | |
1009 | goto send_response; | |
0e4b45ac | 1010 | |
72098143 | 1011 | } |
0e4b45ac | 1012 | |
72098143 NC |
1013 | return; |
1014 | ||
1015 | send_response: | |
1016 | ustcomm_send(sock, reply_header, send_buf); | |
0e4b45ac PMF |
1017 | } |
1018 | ||
4723ca09 NC |
1019 | #define MAX_EVENTS 10 |
1020 | ||
0e4b45ac PMF |
1021 | void *listener_main(void *p) |
1022 | { | |
4723ca09 NC |
1023 | struct ustcomm_sock *epoll_sock; |
1024 | struct epoll_event events[MAX_EVENTS]; | |
1025 | struct sockaddr addr; | |
1026 | int accept_fd, nfds, result, i, addr_size; | |
0e4b45ac PMF |
1027 | |
1028 | DBG("LISTENER"); | |
1029 | ||
1030 | pthread_cleanup_push(listener_cleanup, NULL); | |
1031 | ||
4723ca09 NC |
1032 | for(;;) { |
1033 | nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1); | |
1034 | if (nfds == -1) { | |
1035 | PERROR("listener_main: epoll_wait failed"); | |
1036 | continue; | |
688760ef | 1037 | } |
d0b5f2b9 | 1038 | |
4723ca09 NC |
1039 | for (i = 0; i < nfds; i++) { |
1040 | epoll_sock = (struct ustcomm_sock *)events[i].data.ptr; | |
1041 | if (epoll_sock == listen_sock) { | |
1042 | addr_size = sizeof(struct sockaddr); | |
1043 | accept_fd = accept(epoll_sock->fd, | |
1044 | &addr, | |
1045 | (socklen_t *)&addr_size); | |
1046 | if (accept_fd == -1) { | |
1047 | PERROR("listener_main: accept failed"); | |
1048 | continue; | |
1049 | } | |
1050 | ustcomm_init_sock(accept_fd, epoll_fd, | |
1051 | &ust_socks); | |
1052 | } else { | |
72098143 NC |
1053 | memset(receive_header, 0, |
1054 | sizeof(*receive_header)); | |
1055 | memset(receive_buffer, 0, | |
1056 | sizeof(receive_buffer)); | |
1057 | result = ustcomm_recv(epoll_sock->fd, | |
1058 | receive_header, | |
1059 | receive_buffer); | |
4723ca09 NC |
1060 | if (result == 0) { |
1061 | ustcomm_del_sock(epoll_sock, 0); | |
72098143 NC |
1062 | } else { |
1063 | process_client_cmd(receive_header, | |
1064 | receive_buffer, | |
1065 | epoll_sock->fd); | |
4723ca09 NC |
1066 | } |
1067 | } | |
1068 | } | |
98963de4 | 1069 | } |
fc253ce0 PMF |
1070 | |
1071 | pthread_cleanup_pop(1); | |
98963de4 PMF |
1072 | } |
1073 | ||
cd03ff7f PMF |
1074 | /* These should only be accessed in the parent thread, |
1075 | * not the listener. | |
1076 | */ | |
ce45335c | 1077 | static volatile sig_atomic_t have_listener = 0; |
fc253ce0 | 1078 | static pthread_t listener_thread; |
4440ebcb | 1079 | |
98963de4 PMF |
1080 | void create_listener(void) |
1081 | { | |
c5fdc888 | 1082 | int result; |
f51d84ea PMF |
1083 | sigset_t sig_all_blocked; |
1084 | sigset_t orig_parent_mask; | |
98963de4 | 1085 | |
e9b58dc0 | 1086 | if (have_listener) { |
c5fdc888 | 1087 | WARN("not creating listener because we already had one"); |
4440ebcb | 1088 | return; |
c5fdc888 | 1089 | } |
4440ebcb | 1090 | |
f51d84ea PMF |
1091 | /* A new thread created by pthread_create inherits the signal mask |
1092 | * from the parent. To avoid any signal being received by the | |
1093 | * listener thread, we block all signals temporarily in the parent, | |
1094 | * while we create the listener thread. | |
1095 | */ | |
1096 | ||
1097 | sigfillset(&sig_all_blocked); | |
1098 | ||
1099 | result = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_parent_mask); | |
e9b58dc0 | 1100 | if (result) { |
f51d84ea PMF |
1101 | PERROR("pthread_sigmask: %s", strerror(result)); |
1102 | } | |
1103 | ||
cd03ff7f | 1104 | result = pthread_create(&listener_thread, NULL, listener_main, NULL); |
e9b58dc0 | 1105 | if (result == -1) { |
cd03ff7f | 1106 | PERROR("pthread_create"); |
98963de4 | 1107 | } |
4440ebcb | 1108 | |
f51d84ea PMF |
1109 | /* Restore original signal mask in parent */ |
1110 | result = pthread_sigmask(SIG_SETMASK, &orig_parent_mask, NULL); | |
e9b58dc0 | 1111 | if (result) { |
f51d84ea | 1112 | PERROR("pthread_sigmask: %s", strerror(result)); |
e9b58dc0 | 1113 | } else { |
4267e589 PMF |
1114 | have_listener = 1; |
1115 | } | |
98963de4 PMF |
1116 | } |
1117 | ||
5de74e51 PMF |
1118 | #define AUTOPROBE_DISABLED 0 |
1119 | #define AUTOPROBE_ENABLE_ALL 1 | |
1120 | #define AUTOPROBE_ENABLE_REGEX 2 | |
1121 | static int autoprobe_method = AUTOPROBE_DISABLED; | |
1122 | static regex_t autoprobe_regex; | |
ef290fca | 1123 | |
20b37a31 | 1124 | static void auto_probe_connect(struct marker *m) |
68c1021b PMF |
1125 | { |
1126 | int result; | |
1127 | ||
5de74e51 PMF |
1128 | char* concat_name = NULL; |
1129 | const char *probe_name = "default"; | |
ef290fca | 1130 | |
e9b58dc0 | 1131 | if (autoprobe_method == AUTOPROBE_DISABLED) { |
ef290fca | 1132 | return; |
e9b58dc0 | 1133 | } else if (autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
5de74e51 | 1134 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); |
e9b58dc0 | 1135 | if (result == -1) { |
5de74e51 PMF |
1136 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", |
1137 | m->channel, m->name); | |
1138 | return; | |
1139 | } | |
1140 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { | |
1141 | free(concat_name); | |
1142 | return; | |
1143 | } | |
1144 | free(concat_name); | |
ef290fca PMF |
1145 | } |
1146 | ||
5de74e51 | 1147 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
e9b58dc0 | 1148 | if (result && result != -EEXIST) |
acbf228b | 1149 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); |
20b37a31 | 1150 | |
3ea1e2fc | 1151 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
ef290fca | 1152 | |
20b37a31 PMF |
1153 | } |
1154 | ||
4723ca09 NC |
1155 | static struct ustcomm_sock * init_app_socket(int epoll_fd) |
1156 | { | |
1157 | char *name; | |
1158 | int result; | |
1159 | struct ustcomm_sock *sock; | |
1160 | ||
1161 | result = asprintf(&name, "%s/%d", SOCK_DIR, (int)getpid()); | |
1162 | if (result < 0) { | |
1163 | ERR("string overflow allocating socket name, " | |
1164 | "UST thread bailing"); | |
1165 | return NULL; | |
1166 | } | |
1167 | ||
1168 | result = ensure_dir_exists(SOCK_DIR); | |
1169 | if (result == -1) { | |
1170 | ERR("Unable to create socket directory %s, UST thread bailing", | |
1171 | SOCK_DIR); | |
1172 | goto free_name; | |
1173 | } | |
1174 | ||
1175 | sock = ustcomm_init_named_socket(name, epoll_fd); | |
1176 | if (!sock) { | |
1177 | ERR("Error initializing named socket (%s). Check that directory" | |
1178 | "exists and that it is writable. UST thread bailing", name); | |
1179 | goto free_name; | |
1180 | } | |
1181 | ||
1182 | free(name); | |
1183 | return sock; | |
1184 | ||
1185 | free_name: | |
1186 | free(name); | |
1187 | return NULL; | |
1188 | } | |
1189 | ||
c1083aa8 | 1190 | static void __attribute__((constructor)) init() |
20b37a31 PMF |
1191 | { |
1192 | int result; | |
5de74e51 | 1193 | char* autoprobe_val = NULL; |
223f2e7c AH |
1194 | char* subbuffer_size_val = NULL; |
1195 | char* subbuffer_count_val = NULL; | |
1196 | unsigned int subbuffer_size; | |
1197 | unsigned int subbuffer_count; | |
1198 | unsigned int power; | |
20b37a31 | 1199 | |
ed1317e7 PMF |
1200 | /* Assign the pidunique, to be able to differentiate the processes with same |
1201 | * pid, (before and after an exec). | |
1202 | */ | |
1203 | pidunique = make_pidunique(); | |
1204 | ||
5de74e51 | 1205 | DBG("Tracectl constructor"); |
20b37a31 | 1206 | |
4723ca09 NC |
1207 | /* Set up epoll */ |
1208 | epoll_fd = epoll_create(MAX_EVENTS); | |
1209 | if (epoll_fd == -1) { | |
1210 | ERR("epoll_create failed, tracing shutting down"); | |
1211 | return; | |
1212 | } | |
1213 | ||
1214 | /* Create the socket */ | |
1215 | listen_sock = init_app_socket(epoll_fd); | |
1216 | if (!listen_sock) { | |
1217 | ERR("failed to create application socket," | |
1218 | " tracing shutting down"); | |
3847c3ba PMF |
1219 | return; |
1220 | } | |
2944a629 PMF |
1221 | |
1222 | create_listener(); | |
68c1021b | 1223 | |
5de74e51 | 1224 | autoprobe_val = getenv("UST_AUTOPROBE"); |
e9b58dc0 | 1225 | if (autoprobe_val) { |
4440ebcb PMF |
1226 | struct marker_iter iter; |
1227 | ||
08230db7 | 1228 | DBG("Autoprobe enabled."); |
4440ebcb PMF |
1229 | |
1230 | /* Ensure markers are initialized */ | |
1231 | //init_markers(); | |
1232 | ||
1233 | /* Ensure marker control is initialized, for the probe */ | |
1234 | init_marker_control(); | |
1235 | ||
1236 | /* first, set the callback that will connect the | |
1237 | * probe on new markers | |
1238 | */ | |
e9b58dc0 | 1239 | if (autoprobe_val[0] == '/') { |
5de74e51 PMF |
1240 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); |
1241 | if (result) { | |
1242 | char regexerr[150]; | |
1243 | ||
1244 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); | |
1245 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); | |
1246 | /* don't crash the application just for this */ | |
e9b58dc0 | 1247 | } else { |
5de74e51 PMF |
1248 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; |
1249 | } | |
e9b58dc0 | 1250 | } else { |
5de74e51 PMF |
1251 | /* just enable all instrumentation */ |
1252 | autoprobe_method = AUTOPROBE_ENABLE_ALL; | |
1253 | } | |
1254 | ||
1255 | marker_set_new_marker_cb(auto_probe_connect); | |
1256 | ||
4440ebcb PMF |
1257 | /* Now, connect the probes that were already registered. */ |
1258 | marker_iter_reset(&iter); | |
1259 | marker_iter_start(&iter); | |
1260 | ||
08230db7 | 1261 | DBG("now iterating on markers already registered"); |
e9b58dc0 | 1262 | while (iter.marker) { |
08230db7 | 1263 | DBG("now iterating on marker %s", iter.marker->name); |
4440ebcb PMF |
1264 | auto_probe_connect(iter.marker); |
1265 | marker_iter_next(&iter); | |
1266 | } | |
1267 | } | |
1268 | ||
e9b58dc0 | 1269 | if (getenv("UST_OVERWRITE")) { |
8649cd59 | 1270 | int val = atoi(getenv("UST_OVERWRITE")); |
e9b58dc0 | 1271 | if (val == 0 || val == 1) { |
8649cd59 | 1272 | STORE_SHARED(ust_channels_overwrite_by_default, val); |
e9b58dc0 | 1273 | } else { |
8649cd59 PMF |
1274 | WARN("invalid value for UST_OVERWRITE"); |
1275 | } | |
1276 | } | |
1277 | ||
e9b58dc0 | 1278 | if (getenv("UST_AUTOCOLLECT")) { |
8649cd59 | 1279 | int val = atoi(getenv("UST_AUTOCOLLECT")); |
e9b58dc0 | 1280 | if (val == 0 || val == 1) { |
8649cd59 | 1281 | STORE_SHARED(ust_channels_request_collection_by_default, val); |
e9b58dc0 | 1282 | } else { |
8649cd59 PMF |
1283 | WARN("invalid value for UST_AUTOCOLLECT"); |
1284 | } | |
1285 | } | |
1286 | ||
223f2e7c | 1287 | subbuffer_size_val = getenv("UST_SUBBUF_SIZE"); |
e9b58dc0 | 1288 | if (subbuffer_size_val) { |
223f2e7c AH |
1289 | sscanf(subbuffer_size_val, "%u", &subbuffer_size); |
1290 | power = pow2_higher_or_eq(subbuffer_size); | |
e9b58dc0 | 1291 | if (power != subbuffer_size) |
223f2e7c AH |
1292 | WARN("using the next power of two for buffer size = %u\n", power); |
1293 | chan_infos[LTT_CHANNEL_UST].def_subbufsize = power; | |
1294 | } | |
1295 | ||
1296 | subbuffer_count_val = getenv("UST_SUBBUF_NUM"); | |
e9b58dc0 | 1297 | if (subbuffer_count_val) { |
223f2e7c | 1298 | sscanf(subbuffer_count_val, "%u", &subbuffer_count); |
e9b58dc0 | 1299 | if (subbuffer_count < 2) |
223f2e7c AH |
1300 | subbuffer_count = 2; |
1301 | chan_infos[LTT_CHANNEL_UST].def_subbufcount = subbuffer_count; | |
1302 | } | |
1303 | ||
e9b58dc0 | 1304 | if (getenv("UST_TRACE")) { |
4db647c5 PMF |
1305 | char trace_name[] = "auto"; |
1306 | char trace_type[] = "ustrelay"; | |
1307 | ||
1308 | DBG("starting early tracing"); | |
1309 | ||
1310 | /* Ensure marker control is initialized */ | |
1311 | init_marker_control(); | |
1312 | ||
4db647c5 PMF |
1313 | /* Ensure markers are initialized */ |
1314 | init_markers(); | |
1315 | ||
e17571a5 PMF |
1316 | /* Ensure buffers are initialized, for the transport to be available. |
1317 | * We are about to set a trace type and it will fail without this. | |
1318 | */ | |
1319 | init_ustrelay_transport(); | |
1320 | ||
027ffc9d PMF |
1321 | /* FIXME: When starting early tracing (here), depending on the |
1322 | * order of constructors, it is very well possible some marker | |
1323 | * sections are not yet registered. Because of this, some | |
1324 | * channels may not be registered. Yet, we are about to ask the | |
1325 | * daemon to collect the channels. Channels which are not yet | |
1326 | * registered will not be collected. | |
1327 | * | |
1328 | * Currently, in LTTng, there is no way to add a channel after | |
1329 | * trace start. The reason for this is that it induces complex | |
1330 | * concurrency issues on the trace structures, which can only | |
1331 | * be resolved using RCU. This has not been done yet. As a | |
1332 | * workaround, we are forcing the registration of the "ust" | |
1333 | * channel here. This is the only channel (apart from metadata) | |
1334 | * that can be reliably used in early tracing. | |
1335 | * | |
1336 | * Non-early tracing does not have this problem and can use | |
1337 | * arbitrary channel names. | |
1338 | */ | |
20b37a31 | 1339 | ltt_channels_register("ust"); |
4db647c5 PMF |
1340 | |
1341 | result = ltt_trace_setup(trace_name); | |
e9b58dc0 | 1342 | if (result < 0) { |
4db647c5 PMF |
1343 | ERR("ltt_trace_setup failed"); |
1344 | return; | |
1345 | } | |
1346 | ||
1347 | result = ltt_trace_set_type(trace_name, trace_type); | |
e9b58dc0 | 1348 | if (result < 0) { |
4db647c5 PMF |
1349 | ERR("ltt_trace_set_type failed"); |
1350 | return; | |
1351 | } | |
1352 | ||
1353 | result = ltt_trace_alloc(trace_name); | |
e9b58dc0 | 1354 | if (result < 0) { |
4db647c5 PMF |
1355 | ERR("ltt_trace_alloc failed"); |
1356 | return; | |
1357 | } | |
1358 | ||
1359 | result = ltt_trace_start(trace_name); | |
e9b58dc0 | 1360 | if (result < 0) { |
4db647c5 PMF |
1361 | ERR("ltt_trace_start failed"); |
1362 | return; | |
1363 | } | |
60e57148 PMF |
1364 | |
1365 | /* Do this after the trace is started in order to avoid creating confusion | |
1366 | * if the trace fails to start. */ | |
1367 | inform_consumer_daemon(trace_name); | |
4db647c5 PMF |
1368 | } |
1369 | ||
68c1021b PMF |
1370 | return; |
1371 | ||
1372 | /* should decrementally destroy stuff if error */ | |
1373 | ||
1374 | } | |
1375 | ||
1376 | /* This is only called if we terminate normally, not with an unhandled signal, | |
6d45c11a PMF |
1377 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
1378 | * the last sub-buffer contain a valid end time for the trace. This is done | |
1379 | * automatically only when the trace is properly stopped. | |
1380 | * | |
1381 | * If the traced program crashed, it is always possible to manually add the | |
1382 | * right value in the header, or to open the trace in text mode. | |
1383 | * | |
1384 | * FIXME: Fix LTTV so it doesn't need this. | |
1385 | */ | |
68c1021b | 1386 | |
6d45c11a | 1387 | static void destroy_traces(void) |
68c1021b | 1388 | { |
6d45c11a | 1389 | int result; |
a584bc4e PMF |
1390 | |
1391 | /* if trace running, finish it */ | |
1392 | ||
6d45c11a | 1393 | DBG("destructor stopping traces"); |
a584bc4e | 1394 | |
6d45c11a | 1395 | result = ltt_trace_stop("auto"); |
e9b58dc0 | 1396 | if (result == -1) { |
6d45c11a PMF |
1397 | ERR("ltt_trace_stop error"); |
1398 | } | |
1399 | ||
31d392f1 | 1400 | result = ltt_trace_destroy("auto", 0); |
e9b58dc0 | 1401 | if (result == -1) { |
6d45c11a PMF |
1402 | ERR("ltt_trace_destroy error"); |
1403 | } | |
68c1021b | 1404 | } |
1e2944cb | 1405 | |
97d9b88b PMF |
1406 | static int trace_recording(void) |
1407 | { | |
1408 | int retval = 0; | |
b73a4c47 | 1409 | struct ust_trace *trace; |
97d9b88b PMF |
1410 | |
1411 | ltt_lock_traces(); | |
1412 | ||
1413 | list_for_each_entry(trace, <t_traces.head, list) { | |
e9b58dc0 | 1414 | if (trace->active) { |
97d9b88b PMF |
1415 | retval = 1; |
1416 | break; | |
1417 | } | |
1418 | } | |
1419 | ||
1420 | ltt_unlock_traces(); | |
1421 | ||
1422 | return retval; | |
1423 | } | |
1424 | ||
f293009f | 1425 | int restarting_usleep(useconds_t usecs) |
97d9b88b | 1426 | { |
72098143 NC |
1427 | struct timespec tv; |
1428 | int result; | |
1429 | ||
1430 | tv.tv_sec = 0; | |
1431 | tv.tv_nsec = usecs * 1000; | |
1432 | ||
1433 | do { | |
e9b58dc0 DS |
1434 | result = nanosleep(&tv, &tv); |
1435 | } while (result == -1 && errno == EINTR); | |
97d9b88b PMF |
1436 | |
1437 | return result; | |
1438 | } | |
1439 | ||
4267e589 | 1440 | static void stop_listener(void) |
fc253ce0 PMF |
1441 | { |
1442 | int result; | |
1443 | ||
e9b58dc0 | 1444 | if (!have_listener) |
4267e589 PMF |
1445 | return; |
1446 | ||
fc253ce0 | 1447 | result = pthread_cancel(listener_thread); |
e9b58dc0 | 1448 | if (result != 0) { |
18cbdbac | 1449 | ERR("pthread_cancel: %s", strerror(result)); |
fc253ce0 PMF |
1450 | } |
1451 | result = pthread_join(listener_thread, NULL); | |
e9b58dc0 | 1452 | if (result != 0) { |
18cbdbac | 1453 | ERR("pthread_join: %s", strerror(result)); |
fc253ce0 PMF |
1454 | } |
1455 | } | |
1456 | ||
f293009f PMF |
1457 | /* This destructor keeps the process alive for a few seconds in order |
1458 | * to leave time to ustd to connect to its buffers. This is necessary | |
1459 | * for programs whose execution is very short. It is also useful in all | |
1460 | * programs when tracing is started close to the end of the program | |
1461 | * execution. | |
1462 | * | |
1463 | * FIXME: For now, this only works for the first trace created in a | |
1464 | * process. | |
1465 | */ | |
1466 | ||
97d9b88b PMF |
1467 | static void __attribute__((destructor)) keepalive() |
1468 | { | |
e9b58dc0 | 1469 | if (trace_recording() && LOAD_SHARED(buffers_to_export)) { |
c472cce0 | 1470 | int total = 0; |
f293009f | 1471 | DBG("Keeping process alive for consumer daemon..."); |
e9b58dc0 | 1472 | while (LOAD_SHARED(buffers_to_export)) { |
f293009f | 1473 | const int interv = 200000; |
c472cce0 | 1474 | restarting_usleep(interv); |
f293009f PMF |
1475 | total += interv; |
1476 | ||
e9b58dc0 | 1477 | if (total >= 3000000) { |
c472cce0 | 1478 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
f293009f PMF |
1479 | break; |
1480 | } | |
1481 | } | |
1482 | DBG("Finally dying..."); | |
1483 | } | |
6d45c11a PMF |
1484 | |
1485 | destroy_traces(); | |
1486 | ||
fc253ce0 PMF |
1487 | /* Ask the listener to stop and clean up. */ |
1488 | stop_listener(); | |
97d9b88b | 1489 | } |
97d9b88b | 1490 | |
775c8a3f | 1491 | void ust_potential_exec(void) |
c396a841 PMF |
1492 | { |
1493 | trace_mark(ust, potential_exec, MARK_NOARGS); | |
1494 | ||
775c8a3f PMF |
1495 | DBG("test"); |
1496 | ||
c396a841 PMF |
1497 | keepalive(); |
1498 | } | |
1499 | ||
1e2944cb PMF |
1500 | /* Notify ust that there was a fork. This needs to be called inside |
1501 | * the new process, anytime a process whose memory is not shared with | |
1502 | * the parent is created. If this function is not called, the events | |
1503 | * of the new process will not be collected. | |
616ed36a PMF |
1504 | * |
1505 | * Signals should be disabled before the fork and reenabled only after | |
1506 | * this call in order to guarantee tracing is not started before ust_fork() | |
1507 | * sanitizes the new process. | |
1e2944cb PMF |
1508 | */ |
1509 | ||
616ed36a | 1510 | static void ust_fork(void) |
1e2944cb | 1511 | { |
4723ca09 NC |
1512 | struct ust_buffer *buf, *buf_tmp; |
1513 | struct ustcomm_sock *sock, *sock_tmp; | |
99b72dc0 PMF |
1514 | int result; |
1515 | ||
31d392f1 | 1516 | /* FIXME: technically, the locks could have been taken before the fork */ |
1e2944cb | 1517 | DBG("ust: forking"); |
73850001 PMF |
1518 | |
1519 | /* break lock if necessary */ | |
1520 | ltt_unlock_traces(); | |
1521 | ||
1e2944cb | 1522 | ltt_trace_stop("auto"); |
31d392f1 | 1523 | ltt_trace_destroy("auto", 1); |
4723ca09 NC |
1524 | /* Delete all active connections, but leave them in the epoll set */ |
1525 | list_for_each_entry_safe(sock, sock_tmp, &ust_socks, list) { | |
1526 | ustcomm_del_sock(sock, 1); | |
1527 | } | |
99b72dc0 PMF |
1528 | |
1529 | /* Delete all blocked consumers */ | |
4723ca09 NC |
1530 | list_for_each_entry_safe(buf, buf_tmp, &open_buffers_list, |
1531 | open_buffers_list) { | |
1532 | result = close(buf->data_ready_fd_read); | |
72098143 | 1533 | if (result == -1) { |
2c1ccefa PMF |
1534 | PERROR("close"); |
1535 | } | |
4723ca09 | 1536 | result = close(buf->data_ready_fd_write); |
72098143 | 1537 | if (result == -1) { |
4723ca09 NC |
1538 | PERROR("close"); |
1539 | } | |
1540 | list_del(&buf->open_buffers_list); | |
99b72dc0 PMF |
1541 | } |
1542 | ||
4723ca09 NC |
1543 | /* Clean up the listener socket and epoll, keeping the scoket file */ |
1544 | ustcomm_del_named_sock(listen_sock, 1); | |
1545 | close(epoll_fd); | |
393bc391 | 1546 | |
4723ca09 | 1547 | /* Re-start the launch sequence */ |
8649cd59 | 1548 | STORE_SHARED(buffers_to_export, 0); |
1e2944cb | 1549 | have_listener = 0; |
4723ca09 NC |
1550 | |
1551 | /* Set up epoll */ | |
1552 | epoll_fd = epoll_create(MAX_EVENTS); | |
1553 | if (epoll_fd == -1) { | |
1554 | ERR("epoll_create failed, tracing shutting down"); | |
1555 | return; | |
1556 | } | |
1557 | ||
1558 | /* Create the socket */ | |
1559 | listen_sock = init_app_socket(epoll_fd); | |
1560 | if (!listen_sock) { | |
1561 | ERR("failed to create application socket," | |
1562 | " tracing shutting down"); | |
1563 | return; | |
1564 | } | |
9fb49d0e | 1565 | create_listener(); |
99b72dc0 PMF |
1566 | ltt_trace_setup("auto"); |
1567 | result = ltt_trace_set_type("auto", "ustrelay"); | |
e9b58dc0 | 1568 | if (result < 0) { |
99b72dc0 | 1569 | ERR("ltt_trace_set_type failed"); |
036db133 | 1570 | return; |
99b72dc0 PMF |
1571 | } |
1572 | ||
1573 | ltt_trace_alloc("auto"); | |
1574 | ltt_trace_start("auto"); | |
ad45e833 | 1575 | inform_consumer_daemon("auto"); |
1e2944cb PMF |
1576 | } |
1577 | ||
616ed36a PMF |
1578 | void ust_before_fork(ust_fork_info_t *fork_info) |
1579 | { | |
1580 | /* Disable signals. This is to avoid that the child | |
1581 | * intervenes before it is properly setup for tracing. It is | |
1582 | * safer to disable all signals, because then we know we are not | |
1583 | * breaking anything by restoring the original mask. | |
1584 | */ | |
1585 | sigset_t all_sigs; | |
1586 | int result; | |
1587 | ||
1588 | /* FIXME: | |
1589 | - only do this if tracing is active | |
1590 | */ | |
1591 | ||
1592 | /* Disable signals */ | |
1593 | sigfillset(&all_sigs); | |
1594 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); | |
e9b58dc0 | 1595 | if (result == -1) { |
616ed36a PMF |
1596 | PERROR("sigprocmask"); |
1597 | return; | |
1598 | } | |
1599 | } | |
1600 | ||
1601 | /* Don't call this function directly in a traced program */ | |
1602 | static void ust_after_fork_common(ust_fork_info_t *fork_info) | |
1603 | { | |
1604 | int result; | |
616ed36a PMF |
1605 | |
1606 | /* Restore signals */ | |
1607 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); | |
e9b58dc0 | 1608 | if (result == -1) { |
616ed36a PMF |
1609 | PERROR("sigprocmask"); |
1610 | return; | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | void ust_after_fork_parent(ust_fork_info_t *fork_info) | |
1615 | { | |
1616 | /* Reenable signals */ | |
1617 | ust_after_fork_common(fork_info); | |
1618 | } | |
1619 | ||
1620 | void ust_after_fork_child(ust_fork_info_t *fork_info) | |
1621 | { | |
1622 | /* First sanitize the child */ | |
1623 | ust_fork(); | |
1624 | ||
1625 | /* Then reenable interrupts */ | |
1626 | ust_after_fork_common(fork_info); | |
1627 | } | |
1628 |