| 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 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <stdint.h> |
| 22 | #include <signal.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/socket.h> |
| 25 | #include <sys/un.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <poll.h> |
| 28 | #include <regex.h> |
| 29 | #include <urcu/uatomic_arch.h> |
| 30 | |
| 31 | #include <ust/marker.h> |
| 32 | #include <ust/tracectl.h> |
| 33 | #include "tracer.h" |
| 34 | #include "usterr.h" |
| 35 | #include "ustcomm.h" |
| 36 | #include "buffers.h" |
| 37 | #include "marker-control.h" |
| 38 | #include "multipoll.h" |
| 39 | |
| 40 | #define USTSIGNAL SIGIO |
| 41 | |
| 42 | #define MAX_MSG_SIZE (100) |
| 43 | #define MSG_NOTIF 1 |
| 44 | #define MSG_REGISTER_NOTIF 2 |
| 45 | |
| 46 | char consumer_stack[10000]; |
| 47 | |
| 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 | |
| 53 | struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers); |
| 54 | |
| 55 | static struct ustcomm_app ustcomm_app; |
| 56 | |
| 57 | struct tracecmd { /* no padding */ |
| 58 | uint32_t size; |
| 59 | uint16_t command; |
| 60 | }; |
| 61 | |
| 62 | /* volatile because shared between the listener and the main thread */ |
| 63 | volatile sig_atomic_t buffers_to_export = 0; |
| 64 | |
| 65 | struct trctl_msg { |
| 66 | /* size: the size of all the fields except size itself */ |
| 67 | uint32_t size; |
| 68 | uint16_t type; |
| 69 | /* Only the necessary part of the payload is transferred. It |
| 70 | * may even be none of it. |
| 71 | */ |
| 72 | char payload[94]; |
| 73 | }; |
| 74 | |
| 75 | struct consumer_channel { |
| 76 | int fd; |
| 77 | struct ltt_channel_struct *chan; |
| 78 | }; |
| 79 | |
| 80 | struct blocked_consumer { |
| 81 | int fd_consumer; |
| 82 | int fd_producer; |
| 83 | int tmp_poll_idx; |
| 84 | |
| 85 | /* args to ustcomm_send_reply */ |
| 86 | struct ustcomm_server server; |
| 87 | struct ustcomm_source src; |
| 88 | |
| 89 | /* args to ust_buffers_get_subbuf */ |
| 90 | struct ust_buffer *buf; |
| 91 | |
| 92 | struct list_head list; |
| 93 | }; |
| 94 | |
| 95 | static long long make_pidunique(void) |
| 96 | { |
| 97 | s64 retval; |
| 98 | struct timeval tv; |
| 99 | |
| 100 | gettimeofday(&tv, NULL); |
| 101 | |
| 102 | retval = tv.tv_sec; |
| 103 | retval <<= 32; |
| 104 | retval |= tv.tv_usec; |
| 105 | |
| 106 | return retval; |
| 107 | } |
| 108 | |
| 109 | static void print_markers(FILE *fp) |
| 110 | { |
| 111 | struct marker_iter iter; |
| 112 | |
| 113 | lock_markers(); |
| 114 | marker_iter_reset(&iter); |
| 115 | marker_iter_start(&iter); |
| 116 | |
| 117 | while(iter.marker) { |
| 118 | fprintf(fp, "marker: %s/%s %d \"%s\" %p\n", iter.marker->channel, iter.marker->name, (int)imv_read(iter.marker->state), iter.marker->format, iter.marker->location); |
| 119 | marker_iter_next(&iter); |
| 120 | } |
| 121 | unlock_markers(); |
| 122 | } |
| 123 | |
| 124 | static int init_socket(void); |
| 125 | |
| 126 | /* Ask the daemon to collect a trace called trace_name and being |
| 127 | * produced by this pid. |
| 128 | * |
| 129 | * The trace must be at least allocated. (It can also be started.) |
| 130 | * This is because _ltt_trace_find is used. |
| 131 | */ |
| 132 | |
| 133 | static void inform_consumer_daemon(const char *trace_name) |
| 134 | { |
| 135 | int i,j; |
| 136 | struct ust_trace *trace; |
| 137 | pid_t pid = getpid(); |
| 138 | int result; |
| 139 | |
| 140 | ltt_lock_traces(); |
| 141 | |
| 142 | trace = _ltt_trace_find(trace_name); |
| 143 | if(trace == NULL) { |
| 144 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); |
| 145 | goto finish; |
| 146 | } |
| 147 | |
| 148 | for(i=0; i < trace->nr_channels; i++) { |
| 149 | /* iterate on all cpus */ |
| 150 | for(j=0; j<trace->channels[i].n_cpus; j++) { |
| 151 | char *buf; |
| 152 | asprintf(&buf, "%s_%d", trace->channels[i].channel_name, j); |
| 153 | result = ustcomm_request_consumer(pid, buf); |
| 154 | if(result == -1) { |
| 155 | WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name); |
| 156 | /* continue even if fail */ |
| 157 | } |
| 158 | free(buf); |
| 159 | buffers_to_export++; |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | finish: |
| 164 | ltt_unlock_traces(); |
| 165 | } |
| 166 | |
| 167 | int process_blkd_consumer_act(void *priv, int fd, short events) |
| 168 | { |
| 169 | int result; |
| 170 | long consumed_old = 0; |
| 171 | char *reply; |
| 172 | struct blocked_consumer *bc = (struct blocked_consumer *) priv; |
| 173 | char inbuf; |
| 174 | |
| 175 | result = read(bc->fd_producer, &inbuf, 1); |
| 176 | if(result == -1) { |
| 177 | PERROR("read"); |
| 178 | return -1; |
| 179 | } |
| 180 | if(result == 0) { |
| 181 | int res; |
| 182 | DBG("listener: got messsage that a buffer ended"); |
| 183 | |
| 184 | res = close(bc->fd_producer); |
| 185 | if(res == -1) { |
| 186 | PERROR("close"); |
| 187 | } |
| 188 | |
| 189 | list_del(&bc->list); |
| 190 | |
| 191 | result = ustcomm_send_reply(&bc->server, "END", &bc->src); |
| 192 | if(result < 0) { |
| 193 | ERR("ustcomm_send_reply failed"); |
| 194 | return -1; |
| 195 | } |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | result = ust_buffers_get_subbuf(bc->buf, &consumed_old); |
| 201 | if(result == -EAGAIN) { |
| 202 | WARN("missed buffer?"); |
| 203 | return 0; |
| 204 | } |
| 205 | else if(result < 0) { |
| 206 | ERR("ust_buffers_get_subbuf: error: %s", strerror(-result)); |
| 207 | } |
| 208 | asprintf(&reply, "%s %ld", "OK", consumed_old); |
| 209 | result = ustcomm_send_reply(&bc->server, reply, &bc->src); |
| 210 | if(result < 0) { |
| 211 | ERR("ustcomm_send_reply failed"); |
| 212 | free(reply); |
| 213 | return -1; |
| 214 | } |
| 215 | free(reply); |
| 216 | |
| 217 | list_del(&bc->list); |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | void blocked_consumers_add_to_mp(struct mpentries *ent) |
| 223 | { |
| 224 | struct blocked_consumer *bc; |
| 225 | |
| 226 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 227 | multipoll_add(ent, bc->fd_producer, POLLIN, process_blkd_consumer_act, bc, NULL); |
| 228 | } |
| 229 | |
| 230 | } |
| 231 | |
| 232 | void seperate_channel_cpu(const char *channel_and_cpu, char **channel, int *cpu) |
| 233 | { |
| 234 | const char *sep; |
| 235 | |
| 236 | sep = rindex(channel_and_cpu, '_'); |
| 237 | if(sep == NULL) { |
| 238 | *cpu = -1; |
| 239 | sep = channel_and_cpu + strlen(channel_and_cpu); |
| 240 | } |
| 241 | else { |
| 242 | *cpu = atoi(sep+1); |
| 243 | } |
| 244 | |
| 245 | asprintf(channel, "%.*s", (int)(sep-channel_and_cpu), channel_and_cpu); |
| 246 | } |
| 247 | |
| 248 | static int do_cmd_get_shmid(const char *recvbuf, struct ustcomm_source *src) |
| 249 | { |
| 250 | int retval = 0; |
| 251 | struct ust_trace *trace; |
| 252 | char trace_name[] = "auto"; |
| 253 | int i; |
| 254 | char *channel_and_cpu; |
| 255 | int found = 0; |
| 256 | int result; |
| 257 | char *ch_name; |
| 258 | int ch_cpu; |
| 259 | |
| 260 | DBG("get_shmid"); |
| 261 | |
| 262 | channel_and_cpu = nth_token(recvbuf, 1); |
| 263 | if(channel_and_cpu == NULL) { |
| 264 | ERR("cannot parse channel"); |
| 265 | goto end; |
| 266 | } |
| 267 | |
| 268 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 269 | if(ch_cpu == -1) { |
| 270 | ERR("problem parsing channel name"); |
| 271 | goto free_short_chan_name; |
| 272 | } |
| 273 | |
| 274 | ltt_lock_traces(); |
| 275 | trace = _ltt_trace_find(trace_name); |
| 276 | ltt_unlock_traces(); |
| 277 | |
| 278 | if(trace == NULL) { |
| 279 | ERR("cannot find trace!"); |
| 280 | retval = -1; |
| 281 | goto free_short_chan_name; |
| 282 | } |
| 283 | |
| 284 | for(i=0; i<trace->nr_channels; i++) { |
| 285 | struct ust_channel *channel = &trace->channels[i]; |
| 286 | struct ust_buffer *buf = channel->buf[ch_cpu]; |
| 287 | |
| 288 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 289 | char *reply; |
| 290 | |
| 291 | // DBG("the shmid for the requested channel is %d", buf->shmid); |
| 292 | // DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids); |
| 293 | asprintf(&reply, "%d %d", buf->shmid, channel->buf_struct_shmids[ch_cpu]); |
| 294 | |
| 295 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 296 | if(result) { |
| 297 | ERR("ustcomm_send_reply failed"); |
| 298 | free(reply); |
| 299 | retval = -1; |
| 300 | goto free_short_chan_name; |
| 301 | } |
| 302 | |
| 303 | free(reply); |
| 304 | |
| 305 | found = 1; |
| 306 | break; |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | if(!found) { |
| 311 | ERR("channel not found (%s)", channel_and_cpu); |
| 312 | } |
| 313 | |
| 314 | free_short_chan_name: |
| 315 | free(ch_name); |
| 316 | |
| 317 | end: |
| 318 | return retval; |
| 319 | } |
| 320 | |
| 321 | static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src) |
| 322 | { |
| 323 | int retval = 0; |
| 324 | struct ust_trace *trace; |
| 325 | char trace_name[] = "auto"; |
| 326 | int i; |
| 327 | char *channel_and_cpu; |
| 328 | int found = 0; |
| 329 | int result; |
| 330 | char *ch_name; |
| 331 | int ch_cpu; |
| 332 | |
| 333 | DBG("get_n_subbufs"); |
| 334 | |
| 335 | channel_and_cpu = nth_token(recvbuf, 1); |
| 336 | if(channel_and_cpu == NULL) { |
| 337 | ERR("cannot parse channel"); |
| 338 | goto end; |
| 339 | } |
| 340 | |
| 341 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 342 | if(ch_cpu == -1) { |
| 343 | ERR("problem parsing channel name"); |
| 344 | goto free_short_chan_name; |
| 345 | } |
| 346 | |
| 347 | ltt_lock_traces(); |
| 348 | trace = _ltt_trace_find(trace_name); |
| 349 | ltt_unlock_traces(); |
| 350 | |
| 351 | if(trace == NULL) { |
| 352 | ERR("cannot find trace!"); |
| 353 | retval = -1; |
| 354 | goto free_short_chan_name; |
| 355 | } |
| 356 | |
| 357 | for(i=0; i<trace->nr_channels; i++) { |
| 358 | struct ust_channel *channel = &trace->channels[i]; |
| 359 | |
| 360 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 361 | char *reply; |
| 362 | |
| 363 | DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt); |
| 364 | asprintf(&reply, "%d", channel->subbuf_cnt); |
| 365 | |
| 366 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 367 | if(result) { |
| 368 | ERR("ustcomm_send_reply failed"); |
| 369 | free(reply); |
| 370 | retval = -1; |
| 371 | goto free_short_chan_name; |
| 372 | } |
| 373 | |
| 374 | free(reply); |
| 375 | found = 1; |
| 376 | break; |
| 377 | } |
| 378 | } |
| 379 | if(found == 0) { |
| 380 | ERR("unable to find channel"); |
| 381 | } |
| 382 | |
| 383 | free_short_chan_name: |
| 384 | free(ch_name); |
| 385 | |
| 386 | end: |
| 387 | return retval; |
| 388 | } |
| 389 | |
| 390 | static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src) |
| 391 | { |
| 392 | int retval = 0; |
| 393 | struct ust_trace *trace; |
| 394 | char trace_name[] = "auto"; |
| 395 | int i; |
| 396 | char *channel_and_cpu; |
| 397 | int found = 0; |
| 398 | int result; |
| 399 | char *ch_name; |
| 400 | int ch_cpu; |
| 401 | |
| 402 | DBG("get_subbuf_size"); |
| 403 | |
| 404 | channel_and_cpu = nth_token(recvbuf, 1); |
| 405 | if(channel_and_cpu == NULL) { |
| 406 | ERR("cannot parse channel"); |
| 407 | goto end; |
| 408 | } |
| 409 | |
| 410 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 411 | if(ch_cpu == -1) { |
| 412 | ERR("problem parsing channel name"); |
| 413 | goto free_short_chan_name; |
| 414 | } |
| 415 | |
| 416 | ltt_lock_traces(); |
| 417 | trace = _ltt_trace_find(trace_name); |
| 418 | ltt_unlock_traces(); |
| 419 | |
| 420 | if(trace == NULL) { |
| 421 | ERR("cannot find trace!"); |
| 422 | retval = -1; |
| 423 | goto free_short_chan_name; |
| 424 | } |
| 425 | |
| 426 | for(i=0; i<trace->nr_channels; i++) { |
| 427 | struct ust_channel *channel = &trace->channels[i]; |
| 428 | |
| 429 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 430 | char *reply; |
| 431 | |
| 432 | DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size); |
| 433 | asprintf(&reply, "%zd", channel->subbuf_size); |
| 434 | |
| 435 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 436 | if(result) { |
| 437 | ERR("ustcomm_send_reply failed"); |
| 438 | free(reply); |
| 439 | retval = -1; |
| 440 | goto free_short_chan_name; |
| 441 | } |
| 442 | |
| 443 | free(reply); |
| 444 | found = 1; |
| 445 | break; |
| 446 | } |
| 447 | } |
| 448 | if(found == 0) { |
| 449 | ERR("unable to find channel"); |
| 450 | } |
| 451 | |
| 452 | free_short_chan_name: |
| 453 | free(ch_name); |
| 454 | |
| 455 | end: |
| 456 | return retval; |
| 457 | } |
| 458 | |
| 459 | static unsigned int poweroftwo(unsigned int x) |
| 460 | { |
| 461 | unsigned int power2 = 1; |
| 462 | unsigned int hardcoded = 2147483648; /* FIX max 2^31 */ |
| 463 | |
| 464 | if (x < 2) |
| 465 | return 2; |
| 466 | |
| 467 | while (power2 < x && power2 < hardcoded) |
| 468 | power2 *= 2; |
| 469 | |
| 470 | return power2; |
| 471 | } |
| 472 | |
| 473 | static int do_cmd_set_subbuf_size(const char *recvbuf, struct ustcomm_source *src) |
| 474 | { |
| 475 | char *channel_slash_size; |
| 476 | char ch_name[256]=""; |
| 477 | unsigned int size, power; |
| 478 | int retval = 0; |
| 479 | struct ust_trace *trace; |
| 480 | char trace_name[] = "auto"; |
| 481 | int i; |
| 482 | int found = 0; |
| 483 | |
| 484 | DBG("set_subbuf_size"); |
| 485 | |
| 486 | channel_slash_size = nth_token(recvbuf, 1); |
| 487 | sscanf(channel_slash_size, "%255[^/]/%u", ch_name, &size); |
| 488 | |
| 489 | if(ch_name == NULL) { |
| 490 | ERR("cannot parse channel"); |
| 491 | goto end; |
| 492 | } |
| 493 | |
| 494 | power = poweroftwo(size); |
| 495 | if (power != size) |
| 496 | WARN("using the next 2^n = %u\n", power); |
| 497 | |
| 498 | ltt_lock_traces(); |
| 499 | trace = _ltt_trace_find_setup(trace_name); |
| 500 | if(trace == NULL) { |
| 501 | ERR("cannot find trace!"); |
| 502 | retval = -1; |
| 503 | goto end; |
| 504 | } |
| 505 | |
| 506 | for(i = 0; i < trace->nr_channels; i++) { |
| 507 | struct ust_channel *channel = &trace->channels[i]; |
| 508 | |
| 509 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 510 | |
| 511 | channel->subbuf_size = power; |
| 512 | DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size); |
| 513 | |
| 514 | found = 1; |
| 515 | break; |
| 516 | } |
| 517 | } |
| 518 | if(found == 0) { |
| 519 | ERR("unable to find channel"); |
| 520 | } |
| 521 | |
| 522 | end: |
| 523 | ltt_unlock_traces(); |
| 524 | return retval; |
| 525 | } |
| 526 | |
| 527 | static int do_cmd_set_subbuf_num(const char *recvbuf, struct ustcomm_source *src) |
| 528 | { |
| 529 | char *channel_slash_num; |
| 530 | char ch_name[256]=""; |
| 531 | unsigned int num; |
| 532 | int retval = 0; |
| 533 | struct ust_trace *trace; |
| 534 | char trace_name[] = "auto"; |
| 535 | int i; |
| 536 | int found = 0; |
| 537 | |
| 538 | DBG("set_subbuf_num"); |
| 539 | |
| 540 | channel_slash_num = nth_token(recvbuf, 1); |
| 541 | sscanf(channel_slash_num, "%255[^/]/%u", ch_name, &num); |
| 542 | |
| 543 | if(ch_name == NULL) { |
| 544 | ERR("cannot parse channel"); |
| 545 | goto end; |
| 546 | } |
| 547 | if (num < 2) { |
| 548 | ERR("subbuffer count should be greater than 2"); |
| 549 | goto end; |
| 550 | } |
| 551 | |
| 552 | ltt_lock_traces(); |
| 553 | trace = _ltt_trace_find_setup(trace_name); |
| 554 | if(trace == NULL) { |
| 555 | ERR("cannot find trace!"); |
| 556 | retval = -1; |
| 557 | goto end; |
| 558 | } |
| 559 | |
| 560 | for(i = 0; i < trace->nr_channels; i++) { |
| 561 | struct ust_channel *channel = &trace->channels[i]; |
| 562 | |
| 563 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 564 | |
| 565 | channel->subbuf_cnt = num; |
| 566 | DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt); |
| 567 | |
| 568 | found = 1; |
| 569 | break; |
| 570 | } |
| 571 | } |
| 572 | if(found == 0) { |
| 573 | ERR("unable to find channel"); |
| 574 | } |
| 575 | |
| 576 | end: |
| 577 | ltt_unlock_traces(); |
| 578 | return retval; |
| 579 | } |
| 580 | |
| 581 | static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src) |
| 582 | { |
| 583 | int retval = 0; |
| 584 | struct ust_trace *trace; |
| 585 | char trace_name[] = "auto"; |
| 586 | int i; |
| 587 | char *channel_and_cpu; |
| 588 | int found = 0; |
| 589 | char *ch_name; |
| 590 | int ch_cpu; |
| 591 | |
| 592 | DBG("get_subbuf"); |
| 593 | |
| 594 | channel_and_cpu = nth_token(recvbuf, 1); |
| 595 | if(channel_and_cpu == NULL) { |
| 596 | ERR("cannot parse channel"); |
| 597 | goto end; |
| 598 | } |
| 599 | |
| 600 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 601 | if(ch_cpu == -1) { |
| 602 | ERR("problem parsing channel name"); |
| 603 | goto free_short_chan_name; |
| 604 | } |
| 605 | |
| 606 | ltt_lock_traces(); |
| 607 | trace = _ltt_trace_find(trace_name); |
| 608 | |
| 609 | if(trace == NULL) { |
| 610 | int result; |
| 611 | |
| 612 | DBG("Cannot find trace. It was likely destroyed by the user."); |
| 613 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
| 614 | if(result) { |
| 615 | ERR("ustcomm_send_reply failed"); |
| 616 | retval = -1; |
| 617 | goto unlock_traces; |
| 618 | } |
| 619 | |
| 620 | goto unlock_traces; |
| 621 | } |
| 622 | |
| 623 | for(i=0; i<trace->nr_channels; i++) { |
| 624 | struct ust_channel *channel = &trace->channels[i]; |
| 625 | |
| 626 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 627 | struct ust_buffer *buf = channel->buf[ch_cpu]; |
| 628 | struct blocked_consumer *bc; |
| 629 | |
| 630 | found = 1; |
| 631 | |
| 632 | bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); |
| 633 | if(bc == NULL) { |
| 634 | ERR("malloc returned NULL"); |
| 635 | goto unlock_traces; |
| 636 | } |
| 637 | bc->fd_consumer = src->fd; |
| 638 | bc->fd_producer = buf->data_ready_fd_read; |
| 639 | bc->buf = buf; |
| 640 | bc->src = *src; |
| 641 | bc->server = ustcomm_app.server; |
| 642 | |
| 643 | list_add(&bc->list, &blocked_consumers); |
| 644 | |
| 645 | /* Being here is the proof the daemon has mapped the buffer in its |
| 646 | * memory. We may now decrement buffers_to_export. |
| 647 | */ |
| 648 | if(uatomic_read(&buf->consumed) == 0) { |
| 649 | DBG("decrementing buffers_to_export"); |
| 650 | buffers_to_export--; |
| 651 | } |
| 652 | |
| 653 | break; |
| 654 | } |
| 655 | } |
| 656 | if(found == 0) { |
| 657 | ERR("unable to find channel"); |
| 658 | } |
| 659 | |
| 660 | unlock_traces: |
| 661 | ltt_unlock_traces(); |
| 662 | |
| 663 | free_short_chan_name: |
| 664 | free(ch_name); |
| 665 | |
| 666 | end: |
| 667 | return retval; |
| 668 | } |
| 669 | |
| 670 | static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src) |
| 671 | { |
| 672 | int retval = 0; |
| 673 | struct ust_trace *trace; |
| 674 | char trace_name[] = "auto"; |
| 675 | int i; |
| 676 | char *channel_and_cpu; |
| 677 | int found = 0; |
| 678 | int result; |
| 679 | char *ch_name; |
| 680 | int ch_cpu; |
| 681 | long consumed_old; |
| 682 | char *consumed_old_str; |
| 683 | char *endptr; |
| 684 | char *reply = NULL; |
| 685 | |
| 686 | DBG("put_subbuf"); |
| 687 | |
| 688 | channel_and_cpu = strdup(nth_token(recvbuf, 1)); |
| 689 | if(channel_and_cpu == NULL) { |
| 690 | ERR("cannot parse channel"); |
| 691 | retval = -1; |
| 692 | goto end; |
| 693 | } |
| 694 | |
| 695 | consumed_old_str = strdup(nth_token(recvbuf, 2)); |
| 696 | if(consumed_old_str == NULL) { |
| 697 | ERR("cannot parse consumed_old"); |
| 698 | retval = -1; |
| 699 | goto free_channel_and_cpu; |
| 700 | } |
| 701 | consumed_old = strtol(consumed_old_str, &endptr, 10); |
| 702 | if(*endptr != '\0') { |
| 703 | ERR("invalid value for consumed_old"); |
| 704 | retval = -1; |
| 705 | goto free_consumed_old_str; |
| 706 | } |
| 707 | |
| 708 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 709 | if(ch_cpu == -1) { |
| 710 | ERR("problem parsing channel name"); |
| 711 | retval = -1; |
| 712 | goto free_short_chan_name; |
| 713 | } |
| 714 | |
| 715 | ltt_lock_traces(); |
| 716 | trace = _ltt_trace_find(trace_name); |
| 717 | |
| 718 | if(trace == NULL) { |
| 719 | DBG("Cannot find trace. It was likely destroyed by the user."); |
| 720 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
| 721 | if(result) { |
| 722 | ERR("ustcomm_send_reply failed"); |
| 723 | retval = -1; |
| 724 | goto unlock_traces; |
| 725 | } |
| 726 | |
| 727 | goto unlock_traces; |
| 728 | } |
| 729 | |
| 730 | for(i=0; i<trace->nr_channels; i++) { |
| 731 | struct ust_channel *channel = &trace->channels[i]; |
| 732 | |
| 733 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 734 | struct ust_buffer *buf = channel->buf[ch_cpu]; |
| 735 | |
| 736 | found = 1; |
| 737 | |
| 738 | result = ust_buffers_put_subbuf(buf, consumed_old); |
| 739 | if(result < 0) { |
| 740 | WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu); |
| 741 | asprintf(&reply, "%s", "ERROR"); |
| 742 | } |
| 743 | else { |
| 744 | DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu); |
| 745 | asprintf(&reply, "%s", "OK"); |
| 746 | } |
| 747 | |
| 748 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 749 | if(result) { |
| 750 | ERR("ustcomm_send_reply failed"); |
| 751 | free(reply); |
| 752 | retval = -1; |
| 753 | goto unlock_traces; |
| 754 | } |
| 755 | |
| 756 | free(reply); |
| 757 | break; |
| 758 | } |
| 759 | } |
| 760 | if(found == 0) { |
| 761 | ERR("unable to find channel"); |
| 762 | } |
| 763 | |
| 764 | unlock_traces: |
| 765 | ltt_unlock_traces(); |
| 766 | free_short_chan_name: |
| 767 | free(ch_name); |
| 768 | free_consumed_old_str: |
| 769 | free(consumed_old_str); |
| 770 | free_channel_and_cpu: |
| 771 | free(channel_and_cpu); |
| 772 | |
| 773 | end: |
| 774 | return retval; |
| 775 | } |
| 776 | |
| 777 | static void listener_cleanup(void *ptr) |
| 778 | { |
| 779 | ustcomm_fini_app(&ustcomm_app, 0); |
| 780 | } |
| 781 | |
| 782 | int process_client_cmd(char *recvbuf, struct ustcomm_source *src) |
| 783 | { |
| 784 | int result; |
| 785 | char trace_name[] = "auto"; |
| 786 | char trace_type[] = "ustrelay"; |
| 787 | int len; |
| 788 | |
| 789 | DBG("received a message! it's: %s", recvbuf); |
| 790 | len = strlen(recvbuf); |
| 791 | |
| 792 | if(!strcmp(recvbuf, "print_markers")) { |
| 793 | print_markers(stderr); |
| 794 | } |
| 795 | else if(!strcmp(recvbuf, "list_markers")) { |
| 796 | char *ptr; |
| 797 | size_t size; |
| 798 | FILE *fp; |
| 799 | |
| 800 | fp = open_memstream(&ptr, &size); |
| 801 | print_markers(fp); |
| 802 | fclose(fp); |
| 803 | |
| 804 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, src); |
| 805 | |
| 806 | free(ptr); |
| 807 | } |
| 808 | else if(!strcmp(recvbuf, "start")) { |
| 809 | /* start is an operation that setups the trace, allocates it and starts it */ |
| 810 | result = ltt_trace_setup(trace_name); |
| 811 | if(result < 0) { |
| 812 | ERR("ltt_trace_setup failed"); |
| 813 | return -1; |
| 814 | } |
| 815 | |
| 816 | result = ltt_trace_set_type(trace_name, trace_type); |
| 817 | if(result < 0) { |
| 818 | ERR("ltt_trace_set_type failed"); |
| 819 | return -1; |
| 820 | } |
| 821 | |
| 822 | result = ltt_trace_alloc(trace_name); |
| 823 | if(result < 0) { |
| 824 | ERR("ltt_trace_alloc failed"); |
| 825 | return -1; |
| 826 | } |
| 827 | |
| 828 | inform_consumer_daemon(trace_name); |
| 829 | |
| 830 | result = ltt_trace_start(trace_name); |
| 831 | if(result < 0) { |
| 832 | ERR("ltt_trace_start failed"); |
| 833 | return -1; |
| 834 | } |
| 835 | } |
| 836 | else if(!strcmp(recvbuf, "trace_setup")) { |
| 837 | DBG("trace setup"); |
| 838 | |
| 839 | result = ltt_trace_setup(trace_name); |
| 840 | if(result < 0) { |
| 841 | ERR("ltt_trace_setup failed"); |
| 842 | return -1; |
| 843 | } |
| 844 | |
| 845 | result = ltt_trace_set_type(trace_name, trace_type); |
| 846 | if(result < 0) { |
| 847 | ERR("ltt_trace_set_type failed"); |
| 848 | return -1; |
| 849 | } |
| 850 | } |
| 851 | else if(!strcmp(recvbuf, "trace_alloc")) { |
| 852 | DBG("trace alloc"); |
| 853 | |
| 854 | result = ltt_trace_alloc(trace_name); |
| 855 | if(result < 0) { |
| 856 | ERR("ltt_trace_alloc failed"); |
| 857 | return -1; |
| 858 | } |
| 859 | inform_consumer_daemon(trace_name); |
| 860 | } |
| 861 | else if(!strcmp(recvbuf, "trace_create")) { |
| 862 | DBG("trace create"); |
| 863 | |
| 864 | result = ltt_trace_setup(trace_name); |
| 865 | if(result < 0) { |
| 866 | ERR("ltt_trace_setup failed"); |
| 867 | return -1; |
| 868 | } |
| 869 | |
| 870 | result = ltt_trace_set_type(trace_name, trace_type); |
| 871 | if(result < 0) { |
| 872 | ERR("ltt_trace_set_type failed"); |
| 873 | return -1; |
| 874 | } |
| 875 | } |
| 876 | else if(!strcmp(recvbuf, "trace_start")) { |
| 877 | DBG("trace start"); |
| 878 | |
| 879 | result = ltt_trace_alloc(trace_name); |
| 880 | if(result < 0) { |
| 881 | ERR("ltt_trace_alloc failed"); |
| 882 | return -1; |
| 883 | } |
| 884 | if(!result) { |
| 885 | inform_consumer_daemon(trace_name); |
| 886 | } |
| 887 | |
| 888 | result = ltt_trace_start(trace_name); |
| 889 | if(result < 0) { |
| 890 | ERR("ltt_trace_start failed"); |
| 891 | return -1; |
| 892 | } |
| 893 | } |
| 894 | else if(!strcmp(recvbuf, "trace_stop")) { |
| 895 | DBG("trace stop"); |
| 896 | |
| 897 | result = ltt_trace_stop(trace_name); |
| 898 | if(result < 0) { |
| 899 | ERR("ltt_trace_stop failed"); |
| 900 | return -1; |
| 901 | } |
| 902 | } |
| 903 | else if(!strcmp(recvbuf, "trace_destroy")) { |
| 904 | |
| 905 | DBG("trace destroy"); |
| 906 | |
| 907 | result = ltt_trace_destroy(trace_name, 0); |
| 908 | if(result < 0) { |
| 909 | ERR("ltt_trace_destroy failed"); |
| 910 | return -1; |
| 911 | } |
| 912 | } |
| 913 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
| 914 | do_cmd_get_shmid(recvbuf, src); |
| 915 | } |
| 916 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { |
| 917 | do_cmd_get_n_subbufs(recvbuf, src); |
| 918 | } |
| 919 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { |
| 920 | do_cmd_get_subbuf_size(recvbuf, src); |
| 921 | } |
| 922 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
| 923 | char *libfile; |
| 924 | |
| 925 | libfile = nth_token(recvbuf, 1); |
| 926 | |
| 927 | DBG("load_probe_lib loading %s", libfile); |
| 928 | |
| 929 | free(libfile); |
| 930 | } |
| 931 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
| 932 | do_cmd_get_subbuffer(recvbuf, src); |
| 933 | } |
| 934 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { |
| 935 | do_cmd_put_subbuffer(recvbuf, src); |
| 936 | } |
| 937 | else if(nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) { |
| 938 | do_cmd_set_subbuf_size(recvbuf, src); |
| 939 | } |
| 940 | else if(nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) { |
| 941 | do_cmd_set_subbuf_num(recvbuf, src); |
| 942 | } |
| 943 | else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { |
| 944 | char *channel_slash_name = nth_token(recvbuf, 1); |
| 945 | char channel_name[256]=""; |
| 946 | char marker_name[256]=""; |
| 947 | |
| 948 | result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); |
| 949 | |
| 950 | if(channel_name == NULL || marker_name == NULL) { |
| 951 | WARN("invalid marker name"); |
| 952 | goto next_cmd; |
| 953 | } |
| 954 | |
| 955 | result = ltt_marker_connect(channel_name, marker_name, "default"); |
| 956 | if(result < 0) { |
| 957 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); |
| 958 | } |
| 959 | } |
| 960 | else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { |
| 961 | char *channel_slash_name = nth_token(recvbuf, 1); |
| 962 | char *marker_name; |
| 963 | char *channel_name; |
| 964 | |
| 965 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); |
| 966 | |
| 967 | if(marker_name == NULL) { |
| 968 | } |
| 969 | |
| 970 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); |
| 971 | if(result < 0) { |
| 972 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); |
| 973 | } |
| 974 | } |
| 975 | else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) { |
| 976 | char *reply; |
| 977 | |
| 978 | asprintf(&reply, "%lld", pidunique); |
| 979 | |
| 980 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 981 | if(result) { |
| 982 | ERR("listener: get_pidunique: ustcomm_send_reply failed"); |
| 983 | goto next_cmd; |
| 984 | } |
| 985 | |
| 986 | free(reply); |
| 987 | } |
| 988 | else { |
| 989 | ERR("unable to parse message: %s", recvbuf); |
| 990 | } |
| 991 | |
| 992 | next_cmd: |
| 993 | |
| 994 | return 0; |
| 995 | } |
| 996 | |
| 997 | void *listener_main(void *p) |
| 998 | { |
| 999 | int result; |
| 1000 | |
| 1001 | DBG("LISTENER"); |
| 1002 | |
| 1003 | pthread_cleanup_push(listener_cleanup, NULL); |
| 1004 | |
| 1005 | for(;;) { |
| 1006 | struct mpentries mpent; |
| 1007 | |
| 1008 | multipoll_init(&mpent); |
| 1009 | |
| 1010 | blocked_consumers_add_to_mp(&mpent); |
| 1011 | ustcomm_mp_add_app_clients(&mpent, &ustcomm_app, process_client_cmd); |
| 1012 | |
| 1013 | result = multipoll_poll(&mpent, -1); |
| 1014 | if(result == -1) { |
| 1015 | ERR("error in multipoll_poll"); |
| 1016 | } |
| 1017 | |
| 1018 | multipoll_destroy(&mpent); |
| 1019 | } |
| 1020 | |
| 1021 | pthread_cleanup_pop(1); |
| 1022 | } |
| 1023 | |
| 1024 | /* These should only be accessed in the parent thread, |
| 1025 | * not the listener. |
| 1026 | */ |
| 1027 | static volatile sig_atomic_t have_listener = 0; |
| 1028 | static pthread_t listener_thread; |
| 1029 | |
| 1030 | void create_listener(void) |
| 1031 | { |
| 1032 | int result; |
| 1033 | |
| 1034 | if(have_listener) { |
| 1035 | WARN("not creating listener because we already had one"); |
| 1036 | return; |
| 1037 | } |
| 1038 | |
| 1039 | result = pthread_create(&listener_thread, NULL, listener_main, NULL); |
| 1040 | if(result == -1) { |
| 1041 | PERROR("pthread_create"); |
| 1042 | } |
| 1043 | |
| 1044 | have_listener = 1; |
| 1045 | } |
| 1046 | |
| 1047 | static int init_socket(void) |
| 1048 | { |
| 1049 | return ustcomm_init_app(getpid(), &ustcomm_app); |
| 1050 | } |
| 1051 | |
| 1052 | #define AUTOPROBE_DISABLED 0 |
| 1053 | #define AUTOPROBE_ENABLE_ALL 1 |
| 1054 | #define AUTOPROBE_ENABLE_REGEX 2 |
| 1055 | static int autoprobe_method = AUTOPROBE_DISABLED; |
| 1056 | static regex_t autoprobe_regex; |
| 1057 | |
| 1058 | static void auto_probe_connect(struct marker *m) |
| 1059 | { |
| 1060 | int result; |
| 1061 | |
| 1062 | char* concat_name = NULL; |
| 1063 | const char *probe_name = "default"; |
| 1064 | |
| 1065 | if(autoprobe_method == AUTOPROBE_DISABLED) { |
| 1066 | return; |
| 1067 | } |
| 1068 | else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
| 1069 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); |
| 1070 | if(result == -1) { |
| 1071 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", |
| 1072 | m->channel, m->name); |
| 1073 | return; |
| 1074 | } |
| 1075 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { |
| 1076 | free(concat_name); |
| 1077 | return; |
| 1078 | } |
| 1079 | free(concat_name); |
| 1080 | } |
| 1081 | |
| 1082 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
| 1083 | if(result && result != -EEXIST) |
| 1084 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); |
| 1085 | |
| 1086 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
| 1087 | |
| 1088 | } |
| 1089 | |
| 1090 | static void __attribute__((constructor)) init() |
| 1091 | { |
| 1092 | int result; |
| 1093 | char* autoprobe_val = NULL; |
| 1094 | |
| 1095 | /* Assign the pidunique, to be able to differentiate the processes with same |
| 1096 | * pid, (before and after an exec). |
| 1097 | */ |
| 1098 | pidunique = make_pidunique(); |
| 1099 | |
| 1100 | DBG("Tracectl constructor"); |
| 1101 | |
| 1102 | result = init_socket(); |
| 1103 | if(result == -1) { |
| 1104 | ERR("init_socket error"); |
| 1105 | return; |
| 1106 | } |
| 1107 | |
| 1108 | create_listener(); |
| 1109 | |
| 1110 | autoprobe_val = getenv("UST_AUTOPROBE"); |
| 1111 | if(autoprobe_val) { |
| 1112 | struct marker_iter iter; |
| 1113 | |
| 1114 | DBG("Autoprobe enabled."); |
| 1115 | |
| 1116 | /* Ensure markers are initialized */ |
| 1117 | //init_markers(); |
| 1118 | |
| 1119 | /* Ensure marker control is initialized, for the probe */ |
| 1120 | init_marker_control(); |
| 1121 | |
| 1122 | /* first, set the callback that will connect the |
| 1123 | * probe on new markers |
| 1124 | */ |
| 1125 | if(autoprobe_val[0] == '/') { |
| 1126 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); |
| 1127 | if (result) { |
| 1128 | char regexerr[150]; |
| 1129 | |
| 1130 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); |
| 1131 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); |
| 1132 | /* don't crash the application just for this */ |
| 1133 | } |
| 1134 | else { |
| 1135 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; |
| 1136 | } |
| 1137 | } |
| 1138 | else { |
| 1139 | /* just enable all instrumentation */ |
| 1140 | autoprobe_method = AUTOPROBE_ENABLE_ALL; |
| 1141 | } |
| 1142 | |
| 1143 | marker_set_new_marker_cb(auto_probe_connect); |
| 1144 | |
| 1145 | /* Now, connect the probes that were already registered. */ |
| 1146 | marker_iter_reset(&iter); |
| 1147 | marker_iter_start(&iter); |
| 1148 | |
| 1149 | DBG("now iterating on markers already registered"); |
| 1150 | while(iter.marker) { |
| 1151 | DBG("now iterating on marker %s", iter.marker->name); |
| 1152 | auto_probe_connect(iter.marker); |
| 1153 | marker_iter_next(&iter); |
| 1154 | } |
| 1155 | } |
| 1156 | |
| 1157 | if(getenv("UST_TRACE")) { |
| 1158 | char trace_name[] = "auto"; |
| 1159 | char trace_type[] = "ustrelay"; |
| 1160 | |
| 1161 | DBG("starting early tracing"); |
| 1162 | |
| 1163 | /* Ensure marker control is initialized */ |
| 1164 | init_marker_control(); |
| 1165 | |
| 1166 | /* Ensure markers are initialized */ |
| 1167 | init_markers(); |
| 1168 | |
| 1169 | /* Ensure buffers are initialized, for the transport to be available. |
| 1170 | * We are about to set a trace type and it will fail without this. |
| 1171 | */ |
| 1172 | init_ustrelay_transport(); |
| 1173 | |
| 1174 | /* FIXME: When starting early tracing (here), depending on the |
| 1175 | * order of constructors, it is very well possible some marker |
| 1176 | * sections are not yet registered. Because of this, some |
| 1177 | * channels may not be registered. Yet, we are about to ask the |
| 1178 | * daemon to collect the channels. Channels which are not yet |
| 1179 | * registered will not be collected. |
| 1180 | * |
| 1181 | * Currently, in LTTng, there is no way to add a channel after |
| 1182 | * trace start. The reason for this is that it induces complex |
| 1183 | * concurrency issues on the trace structures, which can only |
| 1184 | * be resolved using RCU. This has not been done yet. As a |
| 1185 | * workaround, we are forcing the registration of the "ust" |
| 1186 | * channel here. This is the only channel (apart from metadata) |
| 1187 | * that can be reliably used in early tracing. |
| 1188 | * |
| 1189 | * Non-early tracing does not have this problem and can use |
| 1190 | * arbitrary channel names. |
| 1191 | */ |
| 1192 | ltt_channels_register("ust"); |
| 1193 | |
| 1194 | result = ltt_trace_setup(trace_name); |
| 1195 | if(result < 0) { |
| 1196 | ERR("ltt_trace_setup failed"); |
| 1197 | return; |
| 1198 | } |
| 1199 | |
| 1200 | result = ltt_trace_set_type(trace_name, trace_type); |
| 1201 | if(result < 0) { |
| 1202 | ERR("ltt_trace_set_type failed"); |
| 1203 | return; |
| 1204 | } |
| 1205 | |
| 1206 | result = ltt_trace_alloc(trace_name); |
| 1207 | if(result < 0) { |
| 1208 | ERR("ltt_trace_alloc failed"); |
| 1209 | return; |
| 1210 | } |
| 1211 | |
| 1212 | result = ltt_trace_start(trace_name); |
| 1213 | if(result < 0) { |
| 1214 | ERR("ltt_trace_start failed"); |
| 1215 | return; |
| 1216 | } |
| 1217 | |
| 1218 | /* Do this after the trace is started in order to avoid creating confusion |
| 1219 | * if the trace fails to start. */ |
| 1220 | inform_consumer_daemon(trace_name); |
| 1221 | } |
| 1222 | |
| 1223 | |
| 1224 | return; |
| 1225 | |
| 1226 | /* should decrementally destroy stuff if error */ |
| 1227 | |
| 1228 | } |
| 1229 | |
| 1230 | /* This is only called if we terminate normally, not with an unhandled signal, |
| 1231 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
| 1232 | * the last sub-buffer contain a valid end time for the trace. This is done |
| 1233 | * automatically only when the trace is properly stopped. |
| 1234 | * |
| 1235 | * If the traced program crashed, it is always possible to manually add the |
| 1236 | * right value in the header, or to open the trace in text mode. |
| 1237 | * |
| 1238 | * FIXME: Fix LTTV so it doesn't need this. |
| 1239 | */ |
| 1240 | |
| 1241 | static void destroy_traces(void) |
| 1242 | { |
| 1243 | int result; |
| 1244 | |
| 1245 | /* if trace running, finish it */ |
| 1246 | |
| 1247 | DBG("destructor stopping traces"); |
| 1248 | |
| 1249 | result = ltt_trace_stop("auto"); |
| 1250 | if(result == -1) { |
| 1251 | ERR("ltt_trace_stop error"); |
| 1252 | } |
| 1253 | |
| 1254 | result = ltt_trace_destroy("auto", 0); |
| 1255 | if(result == -1) { |
| 1256 | ERR("ltt_trace_destroy error"); |
| 1257 | } |
| 1258 | } |
| 1259 | |
| 1260 | static int trace_recording(void) |
| 1261 | { |
| 1262 | int retval = 0; |
| 1263 | struct ust_trace *trace; |
| 1264 | |
| 1265 | ltt_lock_traces(); |
| 1266 | |
| 1267 | list_for_each_entry(trace, <t_traces.head, list) { |
| 1268 | if(trace->active) { |
| 1269 | retval = 1; |
| 1270 | break; |
| 1271 | } |
| 1272 | } |
| 1273 | |
| 1274 | ltt_unlock_traces(); |
| 1275 | |
| 1276 | return retval; |
| 1277 | } |
| 1278 | |
| 1279 | #if 0 |
| 1280 | static int have_consumer(void) |
| 1281 | { |
| 1282 | return !list_empty(&blocked_consumers); |
| 1283 | } |
| 1284 | #endif |
| 1285 | |
| 1286 | int restarting_usleep(useconds_t usecs) |
| 1287 | { |
| 1288 | struct timespec tv; |
| 1289 | int result; |
| 1290 | |
| 1291 | tv.tv_sec = 0; |
| 1292 | tv.tv_nsec = usecs * 1000; |
| 1293 | |
| 1294 | do { |
| 1295 | result = nanosleep(&tv, &tv); |
| 1296 | } while(result == -1 && errno == EINTR); |
| 1297 | |
| 1298 | return result; |
| 1299 | } |
| 1300 | |
| 1301 | static void stop_listener() |
| 1302 | { |
| 1303 | int result; |
| 1304 | |
| 1305 | result = pthread_cancel(listener_thread); |
| 1306 | if(result != 0) { |
| 1307 | ERR("pthread_cancel: %s", strerror(result)); |
| 1308 | } |
| 1309 | result = pthread_join(listener_thread, NULL); |
| 1310 | if(result != 0) { |
| 1311 | ERR("pthread_join: %s", strerror(result)); |
| 1312 | } |
| 1313 | } |
| 1314 | |
| 1315 | /* This destructor keeps the process alive for a few seconds in order |
| 1316 | * to leave time to ustd to connect to its buffers. This is necessary |
| 1317 | * for programs whose execution is very short. It is also useful in all |
| 1318 | * programs when tracing is started close to the end of the program |
| 1319 | * execution. |
| 1320 | * |
| 1321 | * FIXME: For now, this only works for the first trace created in a |
| 1322 | * process. |
| 1323 | */ |
| 1324 | |
| 1325 | static void __attribute__((destructor)) keepalive() |
| 1326 | { |
| 1327 | if(trace_recording() && buffers_to_export) { |
| 1328 | int total = 0; |
| 1329 | DBG("Keeping process alive for consumer daemon..."); |
| 1330 | while(buffers_to_export) { |
| 1331 | const int interv = 200000; |
| 1332 | restarting_usleep(interv); |
| 1333 | total += interv; |
| 1334 | |
| 1335 | if(total >= 3000000) { |
| 1336 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
| 1337 | break; |
| 1338 | } |
| 1339 | } |
| 1340 | DBG("Finally dying..."); |
| 1341 | } |
| 1342 | |
| 1343 | destroy_traces(); |
| 1344 | |
| 1345 | /* Ask the listener to stop and clean up. */ |
| 1346 | stop_listener(); |
| 1347 | } |
| 1348 | |
| 1349 | void ust_potential_exec(void) |
| 1350 | { |
| 1351 | trace_mark(ust, potential_exec, MARK_NOARGS); |
| 1352 | |
| 1353 | DBG("test"); |
| 1354 | |
| 1355 | keepalive(); |
| 1356 | } |
| 1357 | |
| 1358 | /* Notify ust that there was a fork. This needs to be called inside |
| 1359 | * the new process, anytime a process whose memory is not shared with |
| 1360 | * the parent is created. If this function is not called, the events |
| 1361 | * of the new process will not be collected. |
| 1362 | * |
| 1363 | * Signals should be disabled before the fork and reenabled only after |
| 1364 | * this call in order to guarantee tracing is not started before ust_fork() |
| 1365 | * sanitizes the new process. |
| 1366 | */ |
| 1367 | |
| 1368 | static void ust_fork(void) |
| 1369 | { |
| 1370 | struct blocked_consumer *bc; |
| 1371 | struct blocked_consumer *deletable_bc = NULL; |
| 1372 | int result; |
| 1373 | |
| 1374 | /* FIXME: technically, the locks could have been taken before the fork */ |
| 1375 | DBG("ust: forking"); |
| 1376 | |
| 1377 | /* break lock if necessary */ |
| 1378 | ltt_unlock_traces(); |
| 1379 | |
| 1380 | ltt_trace_stop("auto"); |
| 1381 | ltt_trace_destroy("auto", 1); |
| 1382 | /* Delete all active connections */ |
| 1383 | ustcomm_close_all_connections(&ustcomm_app.server); |
| 1384 | |
| 1385 | /* Delete all blocked consumers */ |
| 1386 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 1387 | result = close(bc->fd_producer); |
| 1388 | if(result == -1) { |
| 1389 | PERROR("close"); |
| 1390 | } |
| 1391 | free(deletable_bc); |
| 1392 | deletable_bc = bc; |
| 1393 | list_del(&bc->list); |
| 1394 | } |
| 1395 | |
| 1396 | /* free app, keeping socket file */ |
| 1397 | ustcomm_fini_app(&ustcomm_app, 1); |
| 1398 | |
| 1399 | buffers_to_export = 0; |
| 1400 | have_listener = 0; |
| 1401 | init_socket(); |
| 1402 | create_listener(); |
| 1403 | ltt_trace_setup("auto"); |
| 1404 | result = ltt_trace_set_type("auto", "ustrelay"); |
| 1405 | if(result < 0) { |
| 1406 | ERR("ltt_trace_set_type failed"); |
| 1407 | return; |
| 1408 | } |
| 1409 | |
| 1410 | ltt_trace_alloc("auto"); |
| 1411 | ltt_trace_start("auto"); |
| 1412 | inform_consumer_daemon("auto"); |
| 1413 | } |
| 1414 | |
| 1415 | void ust_before_fork(ust_fork_info_t *fork_info) |
| 1416 | { |
| 1417 | /* Disable signals. This is to avoid that the child |
| 1418 | * intervenes before it is properly setup for tracing. It is |
| 1419 | * safer to disable all signals, because then we know we are not |
| 1420 | * breaking anything by restoring the original mask. |
| 1421 | */ |
| 1422 | sigset_t all_sigs; |
| 1423 | int result; |
| 1424 | |
| 1425 | /* FIXME: |
| 1426 | - only do this if tracing is active |
| 1427 | */ |
| 1428 | |
| 1429 | /* Disable signals */ |
| 1430 | sigfillset(&all_sigs); |
| 1431 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); |
| 1432 | if(result == -1) { |
| 1433 | PERROR("sigprocmask"); |
| 1434 | return; |
| 1435 | } |
| 1436 | } |
| 1437 | |
| 1438 | /* Don't call this function directly in a traced program */ |
| 1439 | static void ust_after_fork_common(ust_fork_info_t *fork_info) |
| 1440 | { |
| 1441 | int result; |
| 1442 | |
| 1443 | /* Restore signals */ |
| 1444 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); |
| 1445 | if(result == -1) { |
| 1446 | PERROR("sigprocmask"); |
| 1447 | return; |
| 1448 | } |
| 1449 | } |
| 1450 | |
| 1451 | void ust_after_fork_parent(ust_fork_info_t *fork_info) |
| 1452 | { |
| 1453 | /* Reenable signals */ |
| 1454 | ust_after_fork_common(fork_info); |
| 1455 | } |
| 1456 | |
| 1457 | void ust_after_fork_child(ust_fork_info_t *fork_info) |
| 1458 | { |
| 1459 | /* First sanitize the child */ |
| 1460 | ust_fork(); |
| 1461 | |
| 1462 | /* Then reenable interrupts */ |
| 1463 | ust_after_fork_common(fork_info); |
| 1464 | } |
| 1465 | |