| 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 | |
| 39 | #define USTSIGNAL SIGIO |
| 40 | |
| 41 | #define MAX_MSG_SIZE (100) |
| 42 | #define MSG_NOTIF 1 |
| 43 | #define MSG_REGISTER_NOTIF 2 |
| 44 | |
| 45 | char consumer_stack[10000]; |
| 46 | |
| 47 | /* This should only be accessed by the constructor, before the creation |
| 48 | * of the listener, and then only by the listener. |
| 49 | */ |
| 50 | s64 pidunique = -1LL; |
| 51 | |
| 52 | struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers); |
| 53 | |
| 54 | static struct ustcomm_app ustcomm_app; |
| 55 | |
| 56 | struct tracecmd { /* no padding */ |
| 57 | uint32_t size; |
| 58 | uint16_t command; |
| 59 | }; |
| 60 | |
| 61 | /* volatile because shared between the listener and the main thread */ |
| 62 | volatile sig_atomic_t buffers_to_export = 0; |
| 63 | |
| 64 | struct trctl_msg { |
| 65 | /* size: the size of all the fields except size itself */ |
| 66 | uint32_t size; |
| 67 | uint16_t type; |
| 68 | /* Only the necessary part of the payload is transferred. It |
| 69 | * may even be none of it. |
| 70 | */ |
| 71 | char payload[94]; |
| 72 | }; |
| 73 | |
| 74 | struct consumer_channel { |
| 75 | int fd; |
| 76 | struct ltt_channel_struct *chan; |
| 77 | }; |
| 78 | |
| 79 | struct blocked_consumer { |
| 80 | int fd_consumer; |
| 81 | int fd_producer; |
| 82 | int tmp_poll_idx; |
| 83 | |
| 84 | /* args to ustcomm_send_reply */ |
| 85 | struct ustcomm_server server; |
| 86 | struct ustcomm_source src; |
| 87 | |
| 88 | /* args to ust_buffers_get_subbuf */ |
| 89 | struct ust_buffer *buf; |
| 90 | |
| 91 | struct list_head list; |
| 92 | }; |
| 93 | |
| 94 | static long long make_pidunique(void) |
| 95 | { |
| 96 | s64 retval; |
| 97 | struct timeval tv; |
| 98 | |
| 99 | gettimeofday(&tv, NULL); |
| 100 | |
| 101 | retval = tv.tv_sec; |
| 102 | retval <<= 32; |
| 103 | retval |= tv.tv_usec; |
| 104 | |
| 105 | return retval; |
| 106 | } |
| 107 | |
| 108 | static void print_markers(FILE *fp) |
| 109 | { |
| 110 | struct marker_iter iter; |
| 111 | |
| 112 | lock_markers(); |
| 113 | marker_iter_reset(&iter); |
| 114 | marker_iter_start(&iter); |
| 115 | |
| 116 | while(iter.marker) { |
| 117 | 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); |
| 118 | marker_iter_next(&iter); |
| 119 | } |
| 120 | unlock_markers(); |
| 121 | } |
| 122 | |
| 123 | static int init_socket(void); |
| 124 | |
| 125 | int fd_notif = -1; |
| 126 | void notif_cb(void) |
| 127 | { |
| 128 | int result; |
| 129 | struct trctl_msg msg; |
| 130 | |
| 131 | /* FIXME: fd_notif should probably be protected by a spinlock */ |
| 132 | |
| 133 | if(fd_notif == -1) |
| 134 | return; |
| 135 | |
| 136 | msg.type = MSG_NOTIF; |
| 137 | msg.size = sizeof(msg.type); |
| 138 | |
| 139 | /* FIXME: don't block here */ |
| 140 | result = write(fd_notif, &msg, msg.size+sizeof(msg.size)); |
| 141 | if(result == -1) { |
| 142 | PERROR("write"); |
| 143 | return; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | /* Ask the daemon to collect a trace called trace_name and being |
| 148 | * produced by this pid. |
| 149 | * |
| 150 | * The trace must be at least allocated. (It can also be started.) |
| 151 | * This is because _ltt_trace_find is used. |
| 152 | */ |
| 153 | |
| 154 | static void inform_consumer_daemon(const char *trace_name) |
| 155 | { |
| 156 | int i,j; |
| 157 | struct ust_trace *trace; |
| 158 | pid_t pid = getpid(); |
| 159 | int result; |
| 160 | |
| 161 | ltt_lock_traces(); |
| 162 | |
| 163 | trace = _ltt_trace_find(trace_name); |
| 164 | if(trace == NULL) { |
| 165 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); |
| 166 | goto finish; |
| 167 | } |
| 168 | |
| 169 | for(i=0; i < trace->nr_channels; i++) { |
| 170 | /* iterate on all cpus */ |
| 171 | for(j=0; j<trace->channels[i].n_cpus; j++) { |
| 172 | char *buf; |
| 173 | asprintf(&buf, "%s_%d", trace->channels[i].channel_name, j); |
| 174 | result = ustcomm_request_consumer(pid, buf); |
| 175 | if(result == -1) { |
| 176 | WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name); |
| 177 | /* continue even if fail */ |
| 178 | } |
| 179 | free(buf); |
| 180 | buffers_to_export++; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | finish: |
| 185 | ltt_unlock_traces(); |
| 186 | } |
| 187 | |
| 188 | void process_blocked_consumers(void) |
| 189 | { |
| 190 | int n_fds = 0; |
| 191 | struct pollfd *fds; |
| 192 | struct blocked_consumer *bc; |
| 193 | int idx = 0; |
| 194 | char inbuf; |
| 195 | int result; |
| 196 | |
| 197 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 198 | n_fds++; |
| 199 | } |
| 200 | |
| 201 | fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); |
| 202 | if(fds == NULL) { |
| 203 | ERR("malloc returned NULL"); |
| 204 | return; |
| 205 | } |
| 206 | |
| 207 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 208 | fds[idx].fd = bc->fd_producer; |
| 209 | fds[idx].events = POLLIN; |
| 210 | bc->tmp_poll_idx = idx; |
| 211 | idx++; |
| 212 | } |
| 213 | |
| 214 | while((result = poll(fds, n_fds, 0)) == -1 && errno == EINTR) |
| 215 | /* nothing */; |
| 216 | if(result == -1) { |
| 217 | PERROR("poll"); |
| 218 | return; |
| 219 | } |
| 220 | |
| 221 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 222 | if(fds[bc->tmp_poll_idx].revents) { |
| 223 | long consumed_old = 0; |
| 224 | char *reply; |
| 225 | |
| 226 | result = read(bc->fd_producer, &inbuf, 1); |
| 227 | if(result == -1) { |
| 228 | PERROR("read"); |
| 229 | continue; |
| 230 | } |
| 231 | if(result == 0) { |
| 232 | int res; |
| 233 | DBG("PRODUCER END"); |
| 234 | |
| 235 | res = close(bc->fd_producer); |
| 236 | if(res == -1) { |
| 237 | PERROR("close"); |
| 238 | } |
| 239 | |
| 240 | list_del(&bc->list); |
| 241 | |
| 242 | result = ustcomm_send_reply(&bc->server, "END", &bc->src); |
| 243 | if(result < 0) { |
| 244 | ERR("ustcomm_send_reply failed"); |
| 245 | continue; |
| 246 | } |
| 247 | |
| 248 | continue; |
| 249 | } |
| 250 | |
| 251 | result = ust_buffers_get_subbuf(bc->buf, &consumed_old); |
| 252 | if(result == -EAGAIN) { |
| 253 | WARN("missed buffer?"); |
| 254 | continue; |
| 255 | } |
| 256 | else if(result < 0) { |
| 257 | DBG("ust_buffers_get_subbuf: error: %s", strerror(-result)); |
| 258 | } |
| 259 | asprintf(&reply, "%s %ld", "OK", consumed_old); |
| 260 | result = ustcomm_send_reply(&bc->server, reply, &bc->src); |
| 261 | if(result < 0) { |
| 262 | ERR("ustcomm_send_reply failed"); |
| 263 | free(reply); |
| 264 | continue; |
| 265 | } |
| 266 | free(reply); |
| 267 | |
| 268 | list_del(&bc->list); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | } |
| 273 | |
| 274 | void seperate_channel_cpu(const char *channel_and_cpu, char **channel, int *cpu) |
| 275 | { |
| 276 | const char *sep; |
| 277 | |
| 278 | sep = rindex(channel_and_cpu, '_'); |
| 279 | if(sep == NULL) { |
| 280 | *cpu = -1; |
| 281 | sep = channel_and_cpu + strlen(channel_and_cpu); |
| 282 | } |
| 283 | else { |
| 284 | *cpu = atoi(sep+1); |
| 285 | } |
| 286 | |
| 287 | asprintf(channel, "%.*s", (int)(sep-channel_and_cpu), channel_and_cpu); |
| 288 | } |
| 289 | |
| 290 | static int do_cmd_get_shmid(const char *recvbuf, struct ustcomm_source *src) |
| 291 | { |
| 292 | int retval = 0; |
| 293 | struct ust_trace *trace; |
| 294 | char trace_name[] = "auto"; |
| 295 | int i; |
| 296 | char *channel_and_cpu; |
| 297 | int found = 0; |
| 298 | int result; |
| 299 | char *ch_name; |
| 300 | int ch_cpu; |
| 301 | |
| 302 | DBG("get_shmid"); |
| 303 | |
| 304 | channel_and_cpu = nth_token(recvbuf, 1); |
| 305 | if(channel_and_cpu == NULL) { |
| 306 | ERR("cannot parse channel"); |
| 307 | goto end; |
| 308 | } |
| 309 | |
| 310 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 311 | if(ch_cpu == -1) { |
| 312 | ERR("problem parsing channel name"); |
| 313 | goto free_short_chan_name; |
| 314 | } |
| 315 | |
| 316 | ltt_lock_traces(); |
| 317 | trace = _ltt_trace_find(trace_name); |
| 318 | ltt_unlock_traces(); |
| 319 | |
| 320 | if(trace == NULL) { |
| 321 | ERR("cannot find trace!"); |
| 322 | retval = -1; |
| 323 | goto free_short_chan_name; |
| 324 | } |
| 325 | |
| 326 | for(i=0; i<trace->nr_channels; i++) { |
| 327 | struct ust_channel *channel = &trace->channels[i]; |
| 328 | struct ust_buffer *buf = channel->buf[ch_cpu]; |
| 329 | |
| 330 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 331 | char *reply; |
| 332 | |
| 333 | // DBG("the shmid for the requested channel is %d", buf->shmid); |
| 334 | // DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids); |
| 335 | asprintf(&reply, "%d %d", buf->shmid, channel->buf_struct_shmids[ch_cpu]); |
| 336 | |
| 337 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 338 | if(result) { |
| 339 | ERR("ustcomm_send_reply failed"); |
| 340 | free(reply); |
| 341 | retval = -1; |
| 342 | goto free_short_chan_name; |
| 343 | } |
| 344 | |
| 345 | free(reply); |
| 346 | |
| 347 | found = 1; |
| 348 | break; |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | if(!found) { |
| 353 | ERR("channel not found (%s)", channel_and_cpu); |
| 354 | } |
| 355 | |
| 356 | free_short_chan_name: |
| 357 | free(ch_name); |
| 358 | |
| 359 | end: |
| 360 | return retval; |
| 361 | } |
| 362 | |
| 363 | static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src) |
| 364 | { |
| 365 | int retval = 0; |
| 366 | struct ust_trace *trace; |
| 367 | char trace_name[] = "auto"; |
| 368 | int i; |
| 369 | char *channel_and_cpu; |
| 370 | int found = 0; |
| 371 | int result; |
| 372 | char *ch_name; |
| 373 | int ch_cpu; |
| 374 | |
| 375 | DBG("get_n_subbufs"); |
| 376 | |
| 377 | channel_and_cpu = nth_token(recvbuf, 1); |
| 378 | if(channel_and_cpu == NULL) { |
| 379 | ERR("cannot parse channel"); |
| 380 | goto end; |
| 381 | } |
| 382 | |
| 383 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 384 | if(ch_cpu == -1) { |
| 385 | ERR("problem parsing channel name"); |
| 386 | goto free_short_chan_name; |
| 387 | } |
| 388 | |
| 389 | ltt_lock_traces(); |
| 390 | trace = _ltt_trace_find(trace_name); |
| 391 | ltt_unlock_traces(); |
| 392 | |
| 393 | if(trace == NULL) { |
| 394 | ERR("cannot find trace!"); |
| 395 | retval = -1; |
| 396 | goto free_short_chan_name; |
| 397 | } |
| 398 | |
| 399 | for(i=0; i<trace->nr_channels; i++) { |
| 400 | struct ust_channel *channel = &trace->channels[i]; |
| 401 | |
| 402 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 403 | char *reply; |
| 404 | |
| 405 | DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt); |
| 406 | asprintf(&reply, "%d", channel->subbuf_cnt); |
| 407 | |
| 408 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 409 | if(result) { |
| 410 | ERR("ustcomm_send_reply failed"); |
| 411 | free(reply); |
| 412 | retval = -1; |
| 413 | goto free_short_chan_name; |
| 414 | } |
| 415 | |
| 416 | free(reply); |
| 417 | found = 1; |
| 418 | break; |
| 419 | } |
| 420 | } |
| 421 | if(found == 0) { |
| 422 | ERR("unable to find channel"); |
| 423 | } |
| 424 | |
| 425 | free_short_chan_name: |
| 426 | free(ch_name); |
| 427 | |
| 428 | end: |
| 429 | return retval; |
| 430 | } |
| 431 | |
| 432 | static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src) |
| 433 | { |
| 434 | int retval = 0; |
| 435 | struct ust_trace *trace; |
| 436 | char trace_name[] = "auto"; |
| 437 | int i; |
| 438 | char *channel_and_cpu; |
| 439 | int found = 0; |
| 440 | int result; |
| 441 | char *ch_name; |
| 442 | int ch_cpu; |
| 443 | |
| 444 | DBG("get_subbuf_size"); |
| 445 | |
| 446 | channel_and_cpu = nth_token(recvbuf, 1); |
| 447 | if(channel_and_cpu == NULL) { |
| 448 | ERR("cannot parse channel"); |
| 449 | goto end; |
| 450 | } |
| 451 | |
| 452 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 453 | if(ch_cpu == -1) { |
| 454 | ERR("problem parsing channel name"); |
| 455 | goto free_short_chan_name; |
| 456 | } |
| 457 | |
| 458 | ltt_lock_traces(); |
| 459 | trace = _ltt_trace_find(trace_name); |
| 460 | ltt_unlock_traces(); |
| 461 | |
| 462 | if(trace == NULL) { |
| 463 | ERR("cannot find trace!"); |
| 464 | retval = -1; |
| 465 | goto free_short_chan_name; |
| 466 | } |
| 467 | |
| 468 | for(i=0; i<trace->nr_channels; i++) { |
| 469 | struct ust_channel *channel = &trace->channels[i]; |
| 470 | |
| 471 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 472 | char *reply; |
| 473 | |
| 474 | DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size); |
| 475 | asprintf(&reply, "%zd", channel->subbuf_size); |
| 476 | |
| 477 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 478 | if(result) { |
| 479 | ERR("ustcomm_send_reply failed"); |
| 480 | free(reply); |
| 481 | retval = -1; |
| 482 | goto free_short_chan_name; |
| 483 | } |
| 484 | |
| 485 | free(reply); |
| 486 | found = 1; |
| 487 | break; |
| 488 | } |
| 489 | } |
| 490 | if(found == 0) { |
| 491 | ERR("unable to find channel"); |
| 492 | } |
| 493 | |
| 494 | free_short_chan_name: |
| 495 | free(ch_name); |
| 496 | |
| 497 | end: |
| 498 | return retval; |
| 499 | } |
| 500 | |
| 501 | static unsigned int poweroftwo(unsigned int x) |
| 502 | { |
| 503 | unsigned int power2 = 1; |
| 504 | unsigned int hardcoded = 2147483648; /* FIX max 2^31 */ |
| 505 | |
| 506 | if (x < 2) |
| 507 | return 2; |
| 508 | |
| 509 | while (power2 < x && power2 < hardcoded) |
| 510 | power2 *= 2; |
| 511 | |
| 512 | return power2; |
| 513 | } |
| 514 | |
| 515 | static int do_cmd_set_subbuf_size(const char *recvbuf, struct ustcomm_source *src) |
| 516 | { |
| 517 | char *channel_slash_size; |
| 518 | char ch_name[256]=""; |
| 519 | unsigned int size, power; |
| 520 | int retval = 0; |
| 521 | struct ust_trace *trace; |
| 522 | char trace_name[] = "auto"; |
| 523 | int i; |
| 524 | int found = 0; |
| 525 | |
| 526 | DBG("set_subbuf_size"); |
| 527 | |
| 528 | channel_slash_size = nth_token(recvbuf, 1); |
| 529 | sscanf(channel_slash_size, "%255[^/]/%u", ch_name, &size); |
| 530 | |
| 531 | if(ch_name == NULL) { |
| 532 | ERR("cannot parse channel"); |
| 533 | goto end; |
| 534 | } |
| 535 | |
| 536 | power = poweroftwo(size); |
| 537 | if (power != size) |
| 538 | WARN("using the next 2^n = %u\n", power); |
| 539 | |
| 540 | ltt_lock_traces(); |
| 541 | trace = _ltt_trace_find_setup(trace_name); |
| 542 | if(trace == NULL) { |
| 543 | ERR("cannot find trace!"); |
| 544 | retval = -1; |
| 545 | goto end; |
| 546 | } |
| 547 | |
| 548 | for(i = 0; i < trace->nr_channels; i++) { |
| 549 | struct ust_channel *channel = &trace->channels[i]; |
| 550 | |
| 551 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 552 | |
| 553 | channel->subbuf_size = power; |
| 554 | DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size); |
| 555 | |
| 556 | found = 1; |
| 557 | break; |
| 558 | } |
| 559 | } |
| 560 | if(found == 0) { |
| 561 | ERR("unable to find channel"); |
| 562 | } |
| 563 | |
| 564 | end: |
| 565 | ltt_unlock_traces(); |
| 566 | return retval; |
| 567 | } |
| 568 | |
| 569 | static int do_cmd_set_subbuf_num(const char *recvbuf, struct ustcomm_source *src) |
| 570 | { |
| 571 | char *channel_slash_num; |
| 572 | char ch_name[256]=""; |
| 573 | unsigned int num; |
| 574 | int retval = 0; |
| 575 | struct ust_trace *trace; |
| 576 | char trace_name[] = "auto"; |
| 577 | int i; |
| 578 | int found = 0; |
| 579 | |
| 580 | DBG("set_subbuf_num"); |
| 581 | |
| 582 | channel_slash_num = nth_token(recvbuf, 1); |
| 583 | sscanf(channel_slash_num, "%255[^/]/%u", ch_name, &num); |
| 584 | |
| 585 | if(ch_name == NULL) { |
| 586 | ERR("cannot parse channel"); |
| 587 | goto end; |
| 588 | } |
| 589 | if (num < 2) { |
| 590 | ERR("subbuffer count should be greater than 2"); |
| 591 | goto end; |
| 592 | } |
| 593 | |
| 594 | ltt_lock_traces(); |
| 595 | trace = _ltt_trace_find_setup(trace_name); |
| 596 | if(trace == NULL) { |
| 597 | ERR("cannot find trace!"); |
| 598 | retval = -1; |
| 599 | goto end; |
| 600 | } |
| 601 | |
| 602 | for(i = 0; i < trace->nr_channels; i++) { |
| 603 | struct ust_channel *channel = &trace->channels[i]; |
| 604 | |
| 605 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 606 | |
| 607 | channel->subbuf_cnt = num; |
| 608 | DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt); |
| 609 | |
| 610 | found = 1; |
| 611 | break; |
| 612 | } |
| 613 | } |
| 614 | if(found == 0) { |
| 615 | ERR("unable to find channel"); |
| 616 | } |
| 617 | |
| 618 | end: |
| 619 | ltt_unlock_traces(); |
| 620 | return retval; |
| 621 | } |
| 622 | |
| 623 | static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src) |
| 624 | { |
| 625 | int retval = 0; |
| 626 | struct ust_trace *trace; |
| 627 | char trace_name[] = "auto"; |
| 628 | int i; |
| 629 | char *channel_and_cpu; |
| 630 | int found = 0; |
| 631 | char *ch_name; |
| 632 | int ch_cpu; |
| 633 | |
| 634 | DBG("get_subbuf"); |
| 635 | |
| 636 | channel_and_cpu = nth_token(recvbuf, 1); |
| 637 | if(channel_and_cpu == NULL) { |
| 638 | ERR("cannot parse channel"); |
| 639 | goto end; |
| 640 | } |
| 641 | |
| 642 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 643 | if(ch_cpu == -1) { |
| 644 | ERR("problem parsing channel name"); |
| 645 | goto free_short_chan_name; |
| 646 | } |
| 647 | |
| 648 | ltt_lock_traces(); |
| 649 | trace = _ltt_trace_find(trace_name); |
| 650 | |
| 651 | if(trace == NULL) { |
| 652 | int result; |
| 653 | |
| 654 | DBG("Cannot find trace. It was likely destroyed by the user."); |
| 655 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
| 656 | if(result) { |
| 657 | ERR("ustcomm_send_reply failed"); |
| 658 | retval = -1; |
| 659 | goto unlock_traces; |
| 660 | } |
| 661 | |
| 662 | goto unlock_traces; |
| 663 | } |
| 664 | |
| 665 | for(i=0; i<trace->nr_channels; i++) { |
| 666 | struct ust_channel *channel = &trace->channels[i]; |
| 667 | |
| 668 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 669 | struct ust_buffer *buf = channel->buf[ch_cpu]; |
| 670 | struct blocked_consumer *bc; |
| 671 | |
| 672 | found = 1; |
| 673 | |
| 674 | bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); |
| 675 | if(bc == NULL) { |
| 676 | ERR("malloc returned NULL"); |
| 677 | goto unlock_traces; |
| 678 | } |
| 679 | bc->fd_consumer = src->fd; |
| 680 | bc->fd_producer = buf->data_ready_fd_read; |
| 681 | bc->buf = buf; |
| 682 | bc->src = *src; |
| 683 | bc->server = ustcomm_app.server; |
| 684 | |
| 685 | list_add(&bc->list, &blocked_consumers); |
| 686 | |
| 687 | /* Being here is the proof the daemon has mapped the buffer in its |
| 688 | * memory. We may now decrement buffers_to_export. |
| 689 | */ |
| 690 | if(uatomic_read(&buf->consumed) == 0) { |
| 691 | DBG("decrementing buffers_to_export"); |
| 692 | buffers_to_export--; |
| 693 | } |
| 694 | |
| 695 | break; |
| 696 | } |
| 697 | } |
| 698 | if(found == 0) { |
| 699 | ERR("unable to find channel"); |
| 700 | } |
| 701 | |
| 702 | unlock_traces: |
| 703 | ltt_unlock_traces(); |
| 704 | |
| 705 | free_short_chan_name: |
| 706 | free(ch_name); |
| 707 | |
| 708 | end: |
| 709 | return retval; |
| 710 | } |
| 711 | |
| 712 | static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src) |
| 713 | { |
| 714 | int retval = 0; |
| 715 | struct ust_trace *trace; |
| 716 | char trace_name[] = "auto"; |
| 717 | int i; |
| 718 | char *channel_and_cpu; |
| 719 | int found = 0; |
| 720 | int result; |
| 721 | char *ch_name; |
| 722 | int ch_cpu; |
| 723 | long consumed_old; |
| 724 | char *consumed_old_str; |
| 725 | char *endptr; |
| 726 | char *reply = NULL; |
| 727 | |
| 728 | DBG("put_subbuf"); |
| 729 | |
| 730 | channel_and_cpu = strdup_malloc(nth_token(recvbuf, 1)); |
| 731 | if(channel_and_cpu == NULL) { |
| 732 | ERR("cannot parse channel"); |
| 733 | retval = -1; |
| 734 | goto end; |
| 735 | } |
| 736 | |
| 737 | consumed_old_str = strdup_malloc(nth_token(recvbuf, 2)); |
| 738 | if(consumed_old_str == NULL) { |
| 739 | ERR("cannot parse consumed_old"); |
| 740 | retval = -1; |
| 741 | goto free_channel_and_cpu; |
| 742 | } |
| 743 | consumed_old = strtol(consumed_old_str, &endptr, 10); |
| 744 | if(*endptr != '\0') { |
| 745 | ERR("invalid value for consumed_old"); |
| 746 | retval = -1; |
| 747 | goto free_consumed_old_str; |
| 748 | } |
| 749 | |
| 750 | seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu); |
| 751 | if(ch_cpu == -1) { |
| 752 | ERR("problem parsing channel name"); |
| 753 | retval = -1; |
| 754 | goto free_short_chan_name; |
| 755 | } |
| 756 | |
| 757 | ltt_lock_traces(); |
| 758 | trace = _ltt_trace_find(trace_name); |
| 759 | |
| 760 | if(trace == NULL) { |
| 761 | DBG("Cannot find trace. It was likely destroyed by the user."); |
| 762 | result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src); |
| 763 | if(result) { |
| 764 | ERR("ustcomm_send_reply failed"); |
| 765 | retval = -1; |
| 766 | goto unlock_traces; |
| 767 | } |
| 768 | |
| 769 | goto unlock_traces; |
| 770 | } |
| 771 | |
| 772 | for(i=0; i<trace->nr_channels; i++) { |
| 773 | struct ust_channel *channel = &trace->channels[i]; |
| 774 | |
| 775 | if(!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 776 | struct ust_buffer *buf = channel->buf[ch_cpu]; |
| 777 | |
| 778 | found = 1; |
| 779 | |
| 780 | result = ust_buffers_put_subbuf(buf, consumed_old); |
| 781 | if(result < 0) { |
| 782 | WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu); |
| 783 | asprintf(&reply, "%s", "ERROR"); |
| 784 | } |
| 785 | else { |
| 786 | DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu); |
| 787 | asprintf(&reply, "%s", "OK"); |
| 788 | } |
| 789 | |
| 790 | result = ustcomm_send_reply(&ustcomm_app.server, reply, src); |
| 791 | if(result) { |
| 792 | ERR("ustcomm_send_reply failed"); |
| 793 | free(reply); |
| 794 | retval = -1; |
| 795 | goto unlock_traces; |
| 796 | } |
| 797 | |
| 798 | free(reply); |
| 799 | break; |
| 800 | } |
| 801 | } |
| 802 | if(found == 0) { |
| 803 | ERR("unable to find channel"); |
| 804 | } |
| 805 | |
| 806 | unlock_traces: |
| 807 | ltt_unlock_traces(); |
| 808 | free_short_chan_name: |
| 809 | free(ch_name); |
| 810 | free_consumed_old_str: |
| 811 | free(consumed_old_str); |
| 812 | free_channel_and_cpu: |
| 813 | free(channel_and_cpu); |
| 814 | |
| 815 | end: |
| 816 | return retval; |
| 817 | } |
| 818 | |
| 819 | static void listener_cleanup(void *ptr) |
| 820 | { |
| 821 | ustcomm_fini_app(&ustcomm_app, 0); |
| 822 | } |
| 823 | |
| 824 | void *listener_main(void *p) |
| 825 | { |
| 826 | int result; |
| 827 | |
| 828 | DBG("LISTENER"); |
| 829 | |
| 830 | pthread_cleanup_push(listener_cleanup, NULL); |
| 831 | |
| 832 | for(;;) { |
| 833 | char trace_name[] = "auto"; |
| 834 | char trace_type[] = "ustrelay"; |
| 835 | char *recvbuf; |
| 836 | int len; |
| 837 | struct ustcomm_source src; |
| 838 | |
| 839 | process_blocked_consumers(); |
| 840 | |
| 841 | result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5); |
| 842 | if(result < 0) { |
| 843 | WARN("error in ustcomm_app_recv_message"); |
| 844 | continue; |
| 845 | } |
| 846 | else if(result == 0) { |
| 847 | /* no message */ |
| 848 | continue; |
| 849 | } |
| 850 | |
| 851 | DBG("received a message! it's: %s", recvbuf); |
| 852 | len = strlen(recvbuf); |
| 853 | |
| 854 | if(!strcmp(recvbuf, "print_markers")) { |
| 855 | print_markers(stderr); |
| 856 | } |
| 857 | else if(!strcmp(recvbuf, "list_markers")) { |
| 858 | char *ptr; |
| 859 | size_t size; |
| 860 | FILE *fp; |
| 861 | |
| 862 | fp = open_memstream(&ptr, &size); |
| 863 | print_markers(fp); |
| 864 | fclose(fp); |
| 865 | |
| 866 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src); |
| 867 | |
| 868 | free(ptr); |
| 869 | } |
| 870 | else if(!strcmp(recvbuf, "start")) { |
| 871 | /* start is an operation that setups the trace, allocates it and starts it */ |
| 872 | result = ltt_trace_setup(trace_name); |
| 873 | if(result < 0) { |
| 874 | ERR("ltt_trace_setup failed"); |
| 875 | return (void *)1; |
| 876 | } |
| 877 | |
| 878 | result = ltt_trace_set_type(trace_name, trace_type); |
| 879 | if(result < 0) { |
| 880 | ERR("ltt_trace_set_type failed"); |
| 881 | return (void *)1; |
| 882 | } |
| 883 | |
| 884 | result = ltt_trace_alloc(trace_name); |
| 885 | if(result < 0) { |
| 886 | ERR("ltt_trace_alloc failed"); |
| 887 | return (void *)1; |
| 888 | } |
| 889 | |
| 890 | inform_consumer_daemon(trace_name); |
| 891 | |
| 892 | result = ltt_trace_start(trace_name); |
| 893 | if(result < 0) { |
| 894 | ERR("ltt_trace_start failed"); |
| 895 | continue; |
| 896 | } |
| 897 | } |
| 898 | else if(!strcmp(recvbuf, "trace_setup")) { |
| 899 | DBG("trace setup"); |
| 900 | |
| 901 | result = ltt_trace_setup(trace_name); |
| 902 | if(result < 0) { |
| 903 | ERR("ltt_trace_setup failed"); |
| 904 | return (void *)1; |
| 905 | } |
| 906 | |
| 907 | result = ltt_trace_set_type(trace_name, trace_type); |
| 908 | if(result < 0) { |
| 909 | ERR("ltt_trace_set_type failed"); |
| 910 | return (void *)1; |
| 911 | } |
| 912 | } |
| 913 | else if(!strcmp(recvbuf, "trace_alloc")) { |
| 914 | DBG("trace alloc"); |
| 915 | |
| 916 | result = ltt_trace_alloc(trace_name); |
| 917 | if(result < 0) { |
| 918 | ERR("ltt_trace_alloc failed"); |
| 919 | return (void *)1; |
| 920 | } |
| 921 | inform_consumer_daemon(trace_name); |
| 922 | } |
| 923 | else if(!strcmp(recvbuf, "trace_create")) { |
| 924 | DBG("trace create"); |
| 925 | |
| 926 | result = ltt_trace_setup(trace_name); |
| 927 | if(result < 0) { |
| 928 | ERR("ltt_trace_setup failed"); |
| 929 | return (void *)1; |
| 930 | } |
| 931 | |
| 932 | result = ltt_trace_set_type(trace_name, trace_type); |
| 933 | if(result < 0) { |
| 934 | ERR("ltt_trace_set_type failed"); |
| 935 | return (void *)1; |
| 936 | } |
| 937 | } |
| 938 | else if(!strcmp(recvbuf, "trace_start")) { |
| 939 | DBG("trace start"); |
| 940 | |
| 941 | result = ltt_trace_alloc(trace_name); |
| 942 | if(result < 0) { |
| 943 | ERR("ltt_trace_alloc failed"); |
| 944 | return (void *)1; |
| 945 | } |
| 946 | if(!result) { |
| 947 | inform_consumer_daemon(trace_name); |
| 948 | } |
| 949 | |
| 950 | result = ltt_trace_start(trace_name); |
| 951 | if(result < 0) { |
| 952 | ERR("ltt_trace_start failed"); |
| 953 | continue; |
| 954 | } |
| 955 | } |
| 956 | else if(!strcmp(recvbuf, "trace_stop")) { |
| 957 | DBG("trace stop"); |
| 958 | |
| 959 | result = ltt_trace_stop(trace_name); |
| 960 | if(result < 0) { |
| 961 | ERR("ltt_trace_stop failed"); |
| 962 | return (void *)1; |
| 963 | } |
| 964 | } |
| 965 | else if(!strcmp(recvbuf, "trace_destroy")) { |
| 966 | |
| 967 | DBG("trace destroy"); |
| 968 | |
| 969 | result = ltt_trace_destroy(trace_name, 0); |
| 970 | if(result < 0) { |
| 971 | ERR("ltt_trace_destroy failed"); |
| 972 | return (void *)1; |
| 973 | } |
| 974 | } |
| 975 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
| 976 | do_cmd_get_shmid(recvbuf, &src); |
| 977 | } |
| 978 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { |
| 979 | do_cmd_get_n_subbufs(recvbuf, &src); |
| 980 | } |
| 981 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { |
| 982 | do_cmd_get_subbuf_size(recvbuf, &src); |
| 983 | } |
| 984 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
| 985 | char *libfile; |
| 986 | |
| 987 | libfile = nth_token(recvbuf, 1); |
| 988 | |
| 989 | DBG("load_probe_lib loading %s", libfile); |
| 990 | |
| 991 | free(libfile); |
| 992 | } |
| 993 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
| 994 | do_cmd_get_subbuffer(recvbuf, &src); |
| 995 | } |
| 996 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { |
| 997 | do_cmd_put_subbuffer(recvbuf, &src); |
| 998 | } |
| 999 | else if(nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) { |
| 1000 | do_cmd_set_subbuf_size(recvbuf, &src); |
| 1001 | } |
| 1002 | else if(nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) { |
| 1003 | do_cmd_set_subbuf_num(recvbuf, &src); |
| 1004 | } |
| 1005 | else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { |
| 1006 | char *channel_slash_name = nth_token(recvbuf, 1); |
| 1007 | char channel_name[256]=""; |
| 1008 | char marker_name[256]=""; |
| 1009 | |
| 1010 | result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); |
| 1011 | |
| 1012 | if(channel_name == NULL || marker_name == NULL) { |
| 1013 | WARN("invalid marker name"); |
| 1014 | goto next_cmd; |
| 1015 | } |
| 1016 | |
| 1017 | result = ltt_marker_connect(channel_name, marker_name, "default"); |
| 1018 | if(result < 0) { |
| 1019 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); |
| 1020 | } |
| 1021 | } |
| 1022 | else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { |
| 1023 | char *channel_slash_name = nth_token(recvbuf, 1); |
| 1024 | char *marker_name; |
| 1025 | char *channel_name; |
| 1026 | |
| 1027 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); |
| 1028 | |
| 1029 | if(marker_name == NULL) { |
| 1030 | } |
| 1031 | |
| 1032 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); |
| 1033 | if(result < 0) { |
| 1034 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); |
| 1035 | } |
| 1036 | } |
| 1037 | else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) { |
| 1038 | char *reply; |
| 1039 | |
| 1040 | asprintf(&reply, "%lld", pidunique); |
| 1041 | |
| 1042 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 1043 | if(result) { |
| 1044 | ERR("listener: get_pidunique: ustcomm_send_reply failed"); |
| 1045 | goto next_cmd; |
| 1046 | } |
| 1047 | |
| 1048 | free(reply); |
| 1049 | } |
| 1050 | // else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { |
| 1051 | // struct ust_trace *trace; |
| 1052 | // char trace_name[] = "auto"; |
| 1053 | // int i; |
| 1054 | // char *channel_name; |
| 1055 | // |
| 1056 | // DBG("get_notifications"); |
| 1057 | // |
| 1058 | // channel_name = strdup_malloc(nth_token(recvbuf, 1)); |
| 1059 | // if(channel_name == NULL) { |
| 1060 | // ERR("put_subbuf_size: cannot parse channel"); |
| 1061 | // goto next_cmd; |
| 1062 | // } |
| 1063 | // |
| 1064 | // ltt_lock_traces(); |
| 1065 | // trace = _ltt_trace_find(trace_name); |
| 1066 | // ltt_unlock_traces(); |
| 1067 | // |
| 1068 | // if(trace == NULL) { |
| 1069 | // ERR("cannot find trace!"); |
| 1070 | // return (void *)1; |
| 1071 | // } |
| 1072 | // |
| 1073 | // for(i=0; i<trace->nr_channels; i++) { |
| 1074 | // struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 1075 | // int fd; |
| 1076 | // |
| 1077 | // if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 1078 | // struct rchan_buf *rbuf = rchan->buf; |
| 1079 | // struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; |
| 1080 | // |
| 1081 | // result = fd = ustcomm_app_detach_client(&ustcomm_app, &src); |
| 1082 | // if(result == -1) { |
| 1083 | // ERR("ustcomm_app_detach_client failed"); |
| 1084 | // goto next_cmd; |
| 1085 | // } |
| 1086 | // |
| 1087 | // lttbuf->wake_consumer_arg = (void *) fd; |
| 1088 | // |
| 1089 | // smp_wmb(); |
| 1090 | // |
| 1091 | // lttbuf->call_wake_consumer = 1; |
| 1092 | // |
| 1093 | // break; |
| 1094 | // } |
| 1095 | // } |
| 1096 | // |
| 1097 | // free(channel_name); |
| 1098 | // } |
| 1099 | else { |
| 1100 | ERR("unable to parse message: %s", recvbuf); |
| 1101 | } |
| 1102 | |
| 1103 | next_cmd: |
| 1104 | free(recvbuf); |
| 1105 | } |
| 1106 | |
| 1107 | pthread_cleanup_pop(1); |
| 1108 | } |
| 1109 | |
| 1110 | /* These should only be accessed in the parent thread, |
| 1111 | * not the listener. |
| 1112 | */ |
| 1113 | static volatile sig_atomic_t have_listener = 0; |
| 1114 | static pthread_t listener_thread; |
| 1115 | |
| 1116 | void create_listener(void) |
| 1117 | { |
| 1118 | int result; |
| 1119 | |
| 1120 | if(have_listener) { |
| 1121 | WARN("not creating listener because we already had one"); |
| 1122 | return; |
| 1123 | } |
| 1124 | |
| 1125 | result = pthread_create(&listener_thread, NULL, listener_main, NULL); |
| 1126 | if(result == -1) { |
| 1127 | PERROR("pthread_create"); |
| 1128 | } |
| 1129 | |
| 1130 | have_listener = 1; |
| 1131 | } |
| 1132 | |
| 1133 | static int init_socket(void) |
| 1134 | { |
| 1135 | return ustcomm_init_app(getpid(), &ustcomm_app); |
| 1136 | } |
| 1137 | |
| 1138 | #define AUTOPROBE_DISABLED 0 |
| 1139 | #define AUTOPROBE_ENABLE_ALL 1 |
| 1140 | #define AUTOPROBE_ENABLE_REGEX 2 |
| 1141 | static int autoprobe_method = AUTOPROBE_DISABLED; |
| 1142 | static regex_t autoprobe_regex; |
| 1143 | |
| 1144 | static void auto_probe_connect(struct marker *m) |
| 1145 | { |
| 1146 | int result; |
| 1147 | |
| 1148 | char* concat_name = NULL; |
| 1149 | const char *probe_name = "default"; |
| 1150 | |
| 1151 | if(autoprobe_method == AUTOPROBE_DISABLED) { |
| 1152 | return; |
| 1153 | } |
| 1154 | else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
| 1155 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); |
| 1156 | if(result == -1) { |
| 1157 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", |
| 1158 | m->channel, m->name); |
| 1159 | return; |
| 1160 | } |
| 1161 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { |
| 1162 | free(concat_name); |
| 1163 | return; |
| 1164 | } |
| 1165 | free(concat_name); |
| 1166 | } |
| 1167 | |
| 1168 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
| 1169 | if(result && result != -EEXIST) |
| 1170 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); |
| 1171 | |
| 1172 | DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
| 1173 | |
| 1174 | } |
| 1175 | |
| 1176 | static void __attribute__((constructor)) init() |
| 1177 | { |
| 1178 | int result; |
| 1179 | char* autoprobe_val = NULL; |
| 1180 | |
| 1181 | /* Assign the pidunique, to be able to differentiate the processes with same |
| 1182 | * pid, (before and after an exec). |
| 1183 | */ |
| 1184 | pidunique = make_pidunique(); |
| 1185 | |
| 1186 | DBG("Tracectl constructor"); |
| 1187 | |
| 1188 | result = init_socket(); |
| 1189 | if(result == -1) { |
| 1190 | ERR("init_socket error"); |
| 1191 | return; |
| 1192 | } |
| 1193 | |
| 1194 | create_listener(); |
| 1195 | |
| 1196 | autoprobe_val = getenv("UST_AUTOPROBE"); |
| 1197 | if(autoprobe_val) { |
| 1198 | struct marker_iter iter; |
| 1199 | |
| 1200 | DBG("Autoprobe enabled."); |
| 1201 | |
| 1202 | /* Ensure markers are initialized */ |
| 1203 | //init_markers(); |
| 1204 | |
| 1205 | /* Ensure marker control is initialized, for the probe */ |
| 1206 | init_marker_control(); |
| 1207 | |
| 1208 | /* first, set the callback that will connect the |
| 1209 | * probe on new markers |
| 1210 | */ |
| 1211 | if(autoprobe_val[0] == '/') { |
| 1212 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); |
| 1213 | if (result) { |
| 1214 | char regexerr[150]; |
| 1215 | |
| 1216 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); |
| 1217 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); |
| 1218 | /* don't crash the application just for this */ |
| 1219 | } |
| 1220 | else { |
| 1221 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; |
| 1222 | } |
| 1223 | } |
| 1224 | else { |
| 1225 | /* just enable all instrumentation */ |
| 1226 | autoprobe_method = AUTOPROBE_ENABLE_ALL; |
| 1227 | } |
| 1228 | |
| 1229 | marker_set_new_marker_cb(auto_probe_connect); |
| 1230 | |
| 1231 | /* Now, connect the probes that were already registered. */ |
| 1232 | marker_iter_reset(&iter); |
| 1233 | marker_iter_start(&iter); |
| 1234 | |
| 1235 | DBG("now iterating on markers already registered"); |
| 1236 | while(iter.marker) { |
| 1237 | DBG("now iterating on marker %s", iter.marker->name); |
| 1238 | auto_probe_connect(iter.marker); |
| 1239 | marker_iter_next(&iter); |
| 1240 | } |
| 1241 | } |
| 1242 | |
| 1243 | if(getenv("UST_TRACE")) { |
| 1244 | char trace_name[] = "auto"; |
| 1245 | char trace_type[] = "ustrelay"; |
| 1246 | |
| 1247 | DBG("starting early tracing"); |
| 1248 | |
| 1249 | /* Ensure marker control is initialized */ |
| 1250 | init_marker_control(); |
| 1251 | |
| 1252 | /* Ensure markers are initialized */ |
| 1253 | init_markers(); |
| 1254 | |
| 1255 | /* Ensure buffers are initialized, for the transport to be available. |
| 1256 | * We are about to set a trace type and it will fail without this. |
| 1257 | */ |
| 1258 | init_ustrelay_transport(); |
| 1259 | |
| 1260 | /* FIXME: When starting early tracing (here), depending on the |
| 1261 | * order of constructors, it is very well possible some marker |
| 1262 | * sections are not yet registered. Because of this, some |
| 1263 | * channels may not be registered. Yet, we are about to ask the |
| 1264 | * daemon to collect the channels. Channels which are not yet |
| 1265 | * registered will not be collected. |
| 1266 | * |
| 1267 | * Currently, in LTTng, there is no way to add a channel after |
| 1268 | * trace start. The reason for this is that it induces complex |
| 1269 | * concurrency issues on the trace structures, which can only |
| 1270 | * be resolved using RCU. This has not been done yet. As a |
| 1271 | * workaround, we are forcing the registration of the "ust" |
| 1272 | * channel here. This is the only channel (apart from metadata) |
| 1273 | * that can be reliably used in early tracing. |
| 1274 | * |
| 1275 | * Non-early tracing does not have this problem and can use |
| 1276 | * arbitrary channel names. |
| 1277 | */ |
| 1278 | ltt_channels_register("ust"); |
| 1279 | |
| 1280 | result = ltt_trace_setup(trace_name); |
| 1281 | if(result < 0) { |
| 1282 | ERR("ltt_trace_setup failed"); |
| 1283 | return; |
| 1284 | } |
| 1285 | |
| 1286 | result = ltt_trace_set_type(trace_name, trace_type); |
| 1287 | if(result < 0) { |
| 1288 | ERR("ltt_trace_set_type failed"); |
| 1289 | return; |
| 1290 | } |
| 1291 | |
| 1292 | result = ltt_trace_alloc(trace_name); |
| 1293 | if(result < 0) { |
| 1294 | ERR("ltt_trace_alloc failed"); |
| 1295 | return; |
| 1296 | } |
| 1297 | |
| 1298 | result = ltt_trace_start(trace_name); |
| 1299 | if(result < 0) { |
| 1300 | ERR("ltt_trace_start failed"); |
| 1301 | return; |
| 1302 | } |
| 1303 | |
| 1304 | /* Do this after the trace is started in order to avoid creating confusion |
| 1305 | * if the trace fails to start. */ |
| 1306 | inform_consumer_daemon(trace_name); |
| 1307 | } |
| 1308 | |
| 1309 | |
| 1310 | return; |
| 1311 | |
| 1312 | /* should decrementally destroy stuff if error */ |
| 1313 | |
| 1314 | } |
| 1315 | |
| 1316 | /* This is only called if we terminate normally, not with an unhandled signal, |
| 1317 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
| 1318 | * the last sub-buffer contain a valid end time for the trace. This is done |
| 1319 | * automatically only when the trace is properly stopped. |
| 1320 | * |
| 1321 | * If the traced program crashed, it is always possible to manually add the |
| 1322 | * right value in the header, or to open the trace in text mode. |
| 1323 | * |
| 1324 | * FIXME: Fix LTTV so it doesn't need this. |
| 1325 | */ |
| 1326 | |
| 1327 | static void destroy_traces(void) |
| 1328 | { |
| 1329 | int result; |
| 1330 | |
| 1331 | /* if trace running, finish it */ |
| 1332 | |
| 1333 | DBG("destructor stopping traces"); |
| 1334 | |
| 1335 | result = ltt_trace_stop("auto"); |
| 1336 | if(result == -1) { |
| 1337 | ERR("ltt_trace_stop error"); |
| 1338 | } |
| 1339 | |
| 1340 | result = ltt_trace_destroy("auto", 0); |
| 1341 | if(result == -1) { |
| 1342 | ERR("ltt_trace_destroy error"); |
| 1343 | } |
| 1344 | } |
| 1345 | |
| 1346 | static int trace_recording(void) |
| 1347 | { |
| 1348 | int retval = 0; |
| 1349 | struct ust_trace *trace; |
| 1350 | |
| 1351 | ltt_lock_traces(); |
| 1352 | |
| 1353 | list_for_each_entry(trace, <t_traces.head, list) { |
| 1354 | if(trace->active) { |
| 1355 | retval = 1; |
| 1356 | break; |
| 1357 | } |
| 1358 | } |
| 1359 | |
| 1360 | ltt_unlock_traces(); |
| 1361 | |
| 1362 | return retval; |
| 1363 | } |
| 1364 | |
| 1365 | #if 0 |
| 1366 | static int have_consumer(void) |
| 1367 | { |
| 1368 | return !list_empty(&blocked_consumers); |
| 1369 | } |
| 1370 | #endif |
| 1371 | |
| 1372 | int restarting_usleep(useconds_t usecs) |
| 1373 | { |
| 1374 | struct timespec tv; |
| 1375 | int result; |
| 1376 | |
| 1377 | tv.tv_sec = 0; |
| 1378 | tv.tv_nsec = usecs * 1000; |
| 1379 | |
| 1380 | do { |
| 1381 | result = nanosleep(&tv, &tv); |
| 1382 | } while(result == -1 && errno == EINTR); |
| 1383 | |
| 1384 | return result; |
| 1385 | } |
| 1386 | |
| 1387 | static void stop_listener() |
| 1388 | { |
| 1389 | int result; |
| 1390 | |
| 1391 | result = pthread_cancel(listener_thread); |
| 1392 | if(result == -1) { |
| 1393 | PERROR("pthread_cancel"); |
| 1394 | } |
| 1395 | result = pthread_join(listener_thread, NULL); |
| 1396 | if(result == -1) { |
| 1397 | PERROR("pthread_join"); |
| 1398 | } |
| 1399 | } |
| 1400 | |
| 1401 | /* This destructor keeps the process alive for a few seconds in order |
| 1402 | * to leave time to ustd to connect to its buffers. This is necessary |
| 1403 | * for programs whose execution is very short. It is also useful in all |
| 1404 | * programs when tracing is started close to the end of the program |
| 1405 | * execution. |
| 1406 | * |
| 1407 | * FIXME: For now, this only works for the first trace created in a |
| 1408 | * process. |
| 1409 | */ |
| 1410 | |
| 1411 | static void __attribute__((destructor)) keepalive() |
| 1412 | { |
| 1413 | if(trace_recording() && buffers_to_export) { |
| 1414 | int total = 0; |
| 1415 | DBG("Keeping process alive for consumer daemon..."); |
| 1416 | while(buffers_to_export) { |
| 1417 | const int interv = 200000; |
| 1418 | restarting_usleep(interv); |
| 1419 | total += interv; |
| 1420 | |
| 1421 | if(total >= 3000000) { |
| 1422 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
| 1423 | break; |
| 1424 | } |
| 1425 | } |
| 1426 | DBG("Finally dying..."); |
| 1427 | } |
| 1428 | |
| 1429 | destroy_traces(); |
| 1430 | |
| 1431 | /* Ask the listener to stop and clean up. */ |
| 1432 | stop_listener(); |
| 1433 | } |
| 1434 | |
| 1435 | void ust_potential_exec(void) |
| 1436 | { |
| 1437 | trace_mark(ust, potential_exec, MARK_NOARGS); |
| 1438 | |
| 1439 | DBG("test"); |
| 1440 | |
| 1441 | keepalive(); |
| 1442 | } |
| 1443 | |
| 1444 | /* Notify ust that there was a fork. This needs to be called inside |
| 1445 | * the new process, anytime a process whose memory is not shared with |
| 1446 | * the parent is created. If this function is not called, the events |
| 1447 | * of the new process will not be collected. |
| 1448 | * |
| 1449 | * Signals should be disabled before the fork and reenabled only after |
| 1450 | * this call in order to guarantee tracing is not started before ust_fork() |
| 1451 | * sanitizes the new process. |
| 1452 | */ |
| 1453 | |
| 1454 | static void ust_fork(void) |
| 1455 | { |
| 1456 | struct blocked_consumer *bc; |
| 1457 | struct blocked_consumer *deletable_bc = NULL; |
| 1458 | int result; |
| 1459 | |
| 1460 | /* FIXME: technically, the locks could have been taken before the fork */ |
| 1461 | DBG("ust: forking"); |
| 1462 | |
| 1463 | /* break lock if necessary */ |
| 1464 | ltt_unlock_traces(); |
| 1465 | |
| 1466 | ltt_trace_stop("auto"); |
| 1467 | ltt_trace_destroy("auto", 1); |
| 1468 | /* Delete all active connections */ |
| 1469 | ustcomm_close_all_connections(&ustcomm_app.server); |
| 1470 | |
| 1471 | /* Delete all blocked consumers */ |
| 1472 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 1473 | result = close(bc->fd_producer); |
| 1474 | if(result == -1) { |
| 1475 | PERROR("close"); |
| 1476 | } |
| 1477 | free(deletable_bc); |
| 1478 | deletable_bc = bc; |
| 1479 | list_del(&bc->list); |
| 1480 | } |
| 1481 | |
| 1482 | /* free app, keeping socket file */ |
| 1483 | ustcomm_fini_app(&ustcomm_app, 1); |
| 1484 | |
| 1485 | buffers_to_export = 0; |
| 1486 | have_listener = 0; |
| 1487 | init_socket(); |
| 1488 | create_listener(); |
| 1489 | ltt_trace_setup("auto"); |
| 1490 | result = ltt_trace_set_type("auto", "ustrelay"); |
| 1491 | if(result < 0) { |
| 1492 | ERR("ltt_trace_set_type failed"); |
| 1493 | return; |
| 1494 | } |
| 1495 | |
| 1496 | ltt_trace_alloc("auto"); |
| 1497 | ltt_trace_start("auto"); |
| 1498 | inform_consumer_daemon("auto"); |
| 1499 | } |
| 1500 | |
| 1501 | void ust_before_fork(ust_fork_info_t *fork_info) |
| 1502 | { |
| 1503 | /* Disable signals. This is to avoid that the child |
| 1504 | * intervenes before it is properly setup for tracing. It is |
| 1505 | * safer to disable all signals, because then we know we are not |
| 1506 | * breaking anything by restoring the original mask. |
| 1507 | */ |
| 1508 | sigset_t all_sigs; |
| 1509 | int result; |
| 1510 | |
| 1511 | /* FIXME: |
| 1512 | - only do this if tracing is active |
| 1513 | */ |
| 1514 | |
| 1515 | /* Disable signals */ |
| 1516 | sigfillset(&all_sigs); |
| 1517 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); |
| 1518 | if(result == -1) { |
| 1519 | PERROR("sigprocmask"); |
| 1520 | return; |
| 1521 | } |
| 1522 | } |
| 1523 | |
| 1524 | /* Don't call this function directly in a traced program */ |
| 1525 | static void ust_after_fork_common(ust_fork_info_t *fork_info) |
| 1526 | { |
| 1527 | int result; |
| 1528 | |
| 1529 | /* Restore signals */ |
| 1530 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); |
| 1531 | if(result == -1) { |
| 1532 | PERROR("sigprocmask"); |
| 1533 | return; |
| 1534 | } |
| 1535 | } |
| 1536 | |
| 1537 | void ust_after_fork_parent(ust_fork_info_t *fork_info) |
| 1538 | { |
| 1539 | /* Reenable signals */ |
| 1540 | ust_after_fork_common(fork_info); |
| 1541 | } |
| 1542 | |
| 1543 | void ust_after_fork_child(ust_fork_info_t *fork_info) |
| 1544 | { |
| 1545 | /* First sanitize the child */ |
| 1546 | ust_fork(); |
| 1547 | |
| 1548 | /* Then reenable interrupts */ |
| 1549 | ust_after_fork_common(fork_info); |
| 1550 | } |
| 1551 | |