| 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 <stdint.h> |
| 21 | #include <signal.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <sys/un.h> |
| 25 | #include <sched.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <poll.h> |
| 28 | #include <regex.h> |
| 29 | |
| 30 | #include <urcu-bp.h> |
| 31 | |
| 32 | #include "marker.h" |
| 33 | #include "tracer.h" |
| 34 | #include "localerr.h" |
| 35 | #include "ustcomm.h" |
| 36 | #include "relay.h" /* FIXME: remove */ |
| 37 | #include "marker-control.h" |
| 38 | |
| 39 | //#define USE_CLONE |
| 40 | |
| 41 | #define USTSIGNAL SIGIO |
| 42 | |
| 43 | #define MAX_MSG_SIZE (100) |
| 44 | #define MSG_NOTIF 1 |
| 45 | #define MSG_REGISTER_NOTIF 2 |
| 46 | |
| 47 | char consumer_stack[10000]; |
| 48 | |
| 49 | /* This should only be accessed by the constructor, before the creation |
| 50 | * of the listener, and then only by the listener. |
| 51 | */ |
| 52 | s64 pidunique = -1LL; |
| 53 | |
| 54 | struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers); |
| 55 | |
| 56 | static struct ustcomm_app ustcomm_app; |
| 57 | |
| 58 | struct tracecmd { /* no padding */ |
| 59 | uint32_t size; |
| 60 | uint16_t command; |
| 61 | }; |
| 62 | |
| 63 | /* volatile because shared between the listener and the main thread */ |
| 64 | volatile sig_atomic_t buffers_to_export = 0; |
| 65 | |
| 66 | struct trctl_msg { |
| 67 | /* size: the size of all the fields except size itself */ |
| 68 | uint32_t size; |
| 69 | uint16_t type; |
| 70 | /* Only the necessary part of the payload is transferred. It |
| 71 | * may even be none of it. |
| 72 | */ |
| 73 | char payload[94]; |
| 74 | }; |
| 75 | |
| 76 | struct consumer_channel { |
| 77 | int fd; |
| 78 | struct ltt_channel_struct *chan; |
| 79 | }; |
| 80 | |
| 81 | struct blocked_consumer { |
| 82 | int fd_consumer; |
| 83 | int fd_producer; |
| 84 | int tmp_poll_idx; |
| 85 | |
| 86 | /* args to ustcomm_send_reply */ |
| 87 | struct ustcomm_server server; |
| 88 | struct ustcomm_source src; |
| 89 | |
| 90 | /* args to ltt_do_get_subbuf */ |
| 91 | struct rchan_buf *rbuf; |
| 92 | struct ltt_channel_buf_struct *lttbuf; |
| 93 | |
| 94 | struct list_head list; |
| 95 | }; |
| 96 | |
| 97 | static long long make_pidunique(void) |
| 98 | { |
| 99 | s64 retval; |
| 100 | struct timeval tv; |
| 101 | |
| 102 | gettimeofday(&tv, NULL); |
| 103 | |
| 104 | retval = tv.tv_sec; |
| 105 | retval <<= 32; |
| 106 | retval |= tv.tv_usec; |
| 107 | |
| 108 | return retval; |
| 109 | } |
| 110 | |
| 111 | static void print_markers(FILE *fp) |
| 112 | { |
| 113 | struct marker_iter iter; |
| 114 | |
| 115 | lock_markers(); |
| 116 | marker_iter_reset(&iter); |
| 117 | marker_iter_start(&iter); |
| 118 | |
| 119 | while(iter.marker) { |
| 120 | fprintf(fp, "marker: %s/%s %d \"%s\"\n", iter.marker->channel, iter.marker->name, (int)imv_read(iter.marker->state), iter.marker->format); |
| 121 | marker_iter_next(&iter); |
| 122 | } |
| 123 | unlock_markers(); |
| 124 | } |
| 125 | |
| 126 | static int init_socket(void); |
| 127 | |
| 128 | /* This needs to be called whenever a new thread is created. It notifies |
| 129 | * liburcu of the new thread. |
| 130 | */ |
| 131 | |
| 132 | void ust_register_thread(void) |
| 133 | { |
| 134 | rcu_register_thread(); |
| 135 | } |
| 136 | |
| 137 | int fd_notif = -1; |
| 138 | void notif_cb(void) |
| 139 | { |
| 140 | int result; |
| 141 | struct trctl_msg msg; |
| 142 | |
| 143 | /* FIXME: fd_notif should probably be protected by a spinlock */ |
| 144 | |
| 145 | if(fd_notif == -1) |
| 146 | return; |
| 147 | |
| 148 | msg.type = MSG_NOTIF; |
| 149 | msg.size = sizeof(msg.type); |
| 150 | |
| 151 | /* FIXME: don't block here */ |
| 152 | result = write(fd_notif, &msg, msg.size+sizeof(msg.size)); |
| 153 | if(result == -1) { |
| 154 | PERROR("write"); |
| 155 | return; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | /* Ask the daemon to collect a trace called trace_name and being |
| 160 | * produced by this pid. |
| 161 | * |
| 162 | * The trace must be at least allocated. (It can also be started.) |
| 163 | * This is because _ltt_trace_find is used. |
| 164 | */ |
| 165 | |
| 166 | static void inform_consumer_daemon(const char *trace_name) |
| 167 | { |
| 168 | int i; |
| 169 | struct ltt_trace_struct *trace; |
| 170 | pid_t pid = getpid(); |
| 171 | int result; |
| 172 | |
| 173 | ltt_lock_traces(); |
| 174 | |
| 175 | trace = _ltt_trace_find(trace_name); |
| 176 | if(trace == NULL) { |
| 177 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); |
| 178 | goto finish; |
| 179 | } |
| 180 | |
| 181 | for(i=0; i < trace->nr_channels; i++) { |
| 182 | result = ustcomm_request_consumer(pid, trace->channels[i].channel_name); |
| 183 | if(result == -1) { |
| 184 | WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name); |
| 185 | /* continue even if fail */ |
| 186 | } |
| 187 | buffers_to_export++; |
| 188 | } |
| 189 | |
| 190 | finish: |
| 191 | ltt_unlock_traces(); |
| 192 | } |
| 193 | |
| 194 | void process_blocked_consumers(void) |
| 195 | { |
| 196 | int n_fds = 0; |
| 197 | struct pollfd *fds; |
| 198 | struct blocked_consumer *bc; |
| 199 | int idx = 0; |
| 200 | char inbuf; |
| 201 | int result; |
| 202 | |
| 203 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 204 | n_fds++; |
| 205 | } |
| 206 | |
| 207 | fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd)); |
| 208 | if(fds == NULL) { |
| 209 | ERR("malloc returned NULL"); |
| 210 | return; |
| 211 | } |
| 212 | |
| 213 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 214 | fds[idx].fd = bc->fd_producer; |
| 215 | fds[idx].events = POLLIN; |
| 216 | bc->tmp_poll_idx = idx; |
| 217 | idx++; |
| 218 | } |
| 219 | |
| 220 | while((result = poll(fds, n_fds, 0)) == -1 && errno == EINTR) |
| 221 | /* nothing */; |
| 222 | if(result == -1) { |
| 223 | PERROR("poll"); |
| 224 | return; |
| 225 | } |
| 226 | |
| 227 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 228 | if(fds[bc->tmp_poll_idx].revents) { |
| 229 | long consumed_old = 0; |
| 230 | char *reply; |
| 231 | |
| 232 | result = read(bc->fd_producer, &inbuf, 1); |
| 233 | if(result == -1) { |
| 234 | PERROR("read"); |
| 235 | continue; |
| 236 | } |
| 237 | if(result == 0) { |
| 238 | DBG("PRODUCER END"); |
| 239 | |
| 240 | close(bc->fd_producer); |
| 241 | |
| 242 | list_del(&bc->list); |
| 243 | |
| 244 | result = ustcomm_send_reply(&bc->server, "END", &bc->src); |
| 245 | if(result < 0) { |
| 246 | ERR("ustcomm_send_reply failed"); |
| 247 | continue; |
| 248 | } |
| 249 | |
| 250 | continue; |
| 251 | } |
| 252 | |
| 253 | result = ltt_do_get_subbuf(bc->rbuf, bc->lttbuf, &consumed_old); |
| 254 | if(result == -EAGAIN) { |
| 255 | WARN("missed buffer?"); |
| 256 | continue; |
| 257 | } |
| 258 | else if(result < 0) { |
| 259 | DBG("ltt_do_get_subbuf: error: %s", strerror(-result)); |
| 260 | } |
| 261 | asprintf(&reply, "%s %ld", "OK", consumed_old); |
| 262 | result = ustcomm_send_reply(&bc->server, reply, &bc->src); |
| 263 | if(result < 0) { |
| 264 | ERR("ustcomm_send_reply failed"); |
| 265 | free(reply); |
| 266 | continue; |
| 267 | } |
| 268 | free(reply); |
| 269 | |
| 270 | list_del(&bc->list); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | } |
| 275 | |
| 276 | void *listener_main(void *p) |
| 277 | { |
| 278 | int result; |
| 279 | |
| 280 | ust_register_thread(); |
| 281 | |
| 282 | DBG("LISTENER"); |
| 283 | |
| 284 | for(;;) { |
| 285 | char trace_name[] = "auto"; |
| 286 | char trace_type[] = "ustrelay"; |
| 287 | char *recvbuf; |
| 288 | int len; |
| 289 | struct ustcomm_source src; |
| 290 | |
| 291 | process_blocked_consumers(); |
| 292 | |
| 293 | result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5); |
| 294 | if(result < 0) { |
| 295 | WARN("error in ustcomm_app_recv_message"); |
| 296 | continue; |
| 297 | } |
| 298 | else if(result == 0) { |
| 299 | /* no message */ |
| 300 | continue; |
| 301 | } |
| 302 | |
| 303 | DBG("received a message! it's: %s", recvbuf); |
| 304 | len = strlen(recvbuf); |
| 305 | |
| 306 | if(!strcmp(recvbuf, "print_markers")) { |
| 307 | print_markers(stderr); |
| 308 | } |
| 309 | else if(!strcmp(recvbuf, "list_markers")) { |
| 310 | char *ptr; |
| 311 | size_t size; |
| 312 | FILE *fp; |
| 313 | |
| 314 | fp = open_memstream(&ptr, &size); |
| 315 | print_markers(fp); |
| 316 | fclose(fp); |
| 317 | |
| 318 | result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src); |
| 319 | |
| 320 | free(ptr); |
| 321 | } |
| 322 | else if(!strcmp(recvbuf, "start")) { |
| 323 | /* start is an operation that setups the trace, allocates it and starts it */ |
| 324 | result = ltt_trace_setup(trace_name); |
| 325 | if(result < 0) { |
| 326 | ERR("ltt_trace_setup failed"); |
| 327 | return (void *)1; |
| 328 | } |
| 329 | |
| 330 | result = ltt_trace_set_type(trace_name, trace_type); |
| 331 | if(result < 0) { |
| 332 | ERR("ltt_trace_set_type failed"); |
| 333 | return (void *)1; |
| 334 | } |
| 335 | |
| 336 | result = ltt_trace_alloc(trace_name); |
| 337 | if(result < 0) { |
| 338 | ERR("ltt_trace_alloc failed"); |
| 339 | return (void *)1; |
| 340 | } |
| 341 | |
| 342 | inform_consumer_daemon(trace_name); |
| 343 | |
| 344 | result = ltt_trace_start(trace_name); |
| 345 | if(result < 0) { |
| 346 | ERR("ltt_trace_start failed"); |
| 347 | continue; |
| 348 | } |
| 349 | } |
| 350 | else if(!strcmp(recvbuf, "trace_setup")) { |
| 351 | DBG("trace setup"); |
| 352 | |
| 353 | result = ltt_trace_setup(trace_name); |
| 354 | if(result < 0) { |
| 355 | ERR("ltt_trace_setup failed"); |
| 356 | return (void *)1; |
| 357 | } |
| 358 | |
| 359 | result = ltt_trace_set_type(trace_name, trace_type); |
| 360 | if(result < 0) { |
| 361 | ERR("ltt_trace_set_type failed"); |
| 362 | return (void *)1; |
| 363 | } |
| 364 | } |
| 365 | else if(!strcmp(recvbuf, "trace_alloc")) { |
| 366 | DBG("trace alloc"); |
| 367 | |
| 368 | result = ltt_trace_alloc(trace_name); |
| 369 | if(result < 0) { |
| 370 | ERR("ltt_trace_alloc failed"); |
| 371 | return (void *)1; |
| 372 | } |
| 373 | } |
| 374 | else if(!strcmp(recvbuf, "trace_start")) { |
| 375 | DBG("trace start"); |
| 376 | |
| 377 | result = ltt_trace_start(trace_name); |
| 378 | if(result < 0) { |
| 379 | ERR("ltt_trace_start failed"); |
| 380 | continue; |
| 381 | } |
| 382 | } |
| 383 | else if(!strcmp(recvbuf, "trace_stop")) { |
| 384 | DBG("trace stop"); |
| 385 | |
| 386 | result = ltt_trace_stop(trace_name); |
| 387 | if(result < 0) { |
| 388 | ERR("ltt_trace_stop failed"); |
| 389 | return (void *)1; |
| 390 | } |
| 391 | } |
| 392 | else if(!strcmp(recvbuf, "trace_destroy")) { |
| 393 | |
| 394 | DBG("trace destroy"); |
| 395 | |
| 396 | result = ltt_trace_destroy(trace_name); |
| 397 | if(result < 0) { |
| 398 | ERR("ltt_trace_destroy failed"); |
| 399 | return (void *)1; |
| 400 | } |
| 401 | } |
| 402 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
| 403 | struct ltt_trace_struct *trace; |
| 404 | char trace_name[] = "auto"; |
| 405 | int i; |
| 406 | char *channel_name; |
| 407 | |
| 408 | DBG("get_shmid"); |
| 409 | |
| 410 | channel_name = nth_token(recvbuf, 1); |
| 411 | if(channel_name == NULL) { |
| 412 | ERR("get_shmid: cannot parse channel"); |
| 413 | goto next_cmd; |
| 414 | } |
| 415 | |
| 416 | ltt_lock_traces(); |
| 417 | trace = _ltt_trace_find(trace_name); |
| 418 | ltt_unlock_traces(); |
| 419 | |
| 420 | if(trace == NULL) { |
| 421 | ERR("cannot find trace!"); |
| 422 | return (void *)1; |
| 423 | } |
| 424 | |
| 425 | for(i=0; i<trace->nr_channels; i++) { |
| 426 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 427 | struct rchan_buf *rbuf = rchan->buf; |
| 428 | struct ltt_channel_struct *ltt_channel = (struct ltt_channel_struct *)rchan->private_data; |
| 429 | |
| 430 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 431 | char *reply; |
| 432 | |
| 433 | DBG("the shmid for the requested channel is %d", rbuf->shmid); |
| 434 | DBG("the shmid for its buffer structure is %d", ltt_channel->buf_shmid); |
| 435 | asprintf(&reply, "%d %d", rbuf->shmid, ltt_channel->buf_shmid); |
| 436 | |
| 437 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 438 | if(result) { |
| 439 | ERR("listener: get_shmid: ustcomm_send_reply failed"); |
| 440 | goto next_cmd; |
| 441 | } |
| 442 | |
| 443 | free(reply); |
| 444 | |
| 445 | break; |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | buffers_to_export--; |
| 450 | } |
| 451 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { |
| 452 | struct ltt_trace_struct *trace; |
| 453 | char trace_name[] = "auto"; |
| 454 | int i; |
| 455 | char *channel_name; |
| 456 | |
| 457 | DBG("get_n_subbufs"); |
| 458 | |
| 459 | channel_name = nth_token(recvbuf, 1); |
| 460 | if(channel_name == NULL) { |
| 461 | ERR("get_n_subbufs: cannot parse channel"); |
| 462 | goto next_cmd; |
| 463 | } |
| 464 | |
| 465 | ltt_lock_traces(); |
| 466 | trace = _ltt_trace_find(trace_name); |
| 467 | ltt_unlock_traces(); |
| 468 | |
| 469 | if(trace == NULL) { |
| 470 | ERR("cannot find trace!"); |
| 471 | return (void *)1; |
| 472 | } |
| 473 | |
| 474 | for(i=0; i<trace->nr_channels; i++) { |
| 475 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 476 | |
| 477 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 478 | char *reply; |
| 479 | |
| 480 | DBG("the n_subbufs for the requested channel is %zd", rchan->n_subbufs); |
| 481 | asprintf(&reply, "%zd", rchan->n_subbufs); |
| 482 | |
| 483 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 484 | if(result) { |
| 485 | ERR("listener: get_n_subbufs: ustcomm_send_reply failed"); |
| 486 | goto next_cmd; |
| 487 | } |
| 488 | |
| 489 | free(reply); |
| 490 | |
| 491 | break; |
| 492 | } |
| 493 | } |
| 494 | } |
| 495 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { |
| 496 | struct ltt_trace_struct *trace; |
| 497 | char trace_name[] = "auto"; |
| 498 | int i; |
| 499 | char *channel_name; |
| 500 | |
| 501 | DBG("get_subbuf_size"); |
| 502 | |
| 503 | channel_name = nth_token(recvbuf, 1); |
| 504 | if(channel_name == NULL) { |
| 505 | ERR("get_subbuf_size: cannot parse channel"); |
| 506 | goto next_cmd; |
| 507 | } |
| 508 | |
| 509 | ltt_lock_traces(); |
| 510 | trace = _ltt_trace_find(trace_name); |
| 511 | ltt_unlock_traces(); |
| 512 | |
| 513 | if(trace == NULL) { |
| 514 | ERR("cannot find trace!"); |
| 515 | return (void *)1; |
| 516 | } |
| 517 | |
| 518 | for(i=0; i<trace->nr_channels; i++) { |
| 519 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 520 | |
| 521 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 522 | char *reply; |
| 523 | |
| 524 | DBG("the subbuf_size for the requested channel is %zd", rchan->subbuf_size); |
| 525 | asprintf(&reply, "%zd", rchan->subbuf_size); |
| 526 | |
| 527 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 528 | if(result) { |
| 529 | ERR("listener: get_subbuf_size: ustcomm_send_reply failed"); |
| 530 | goto next_cmd; |
| 531 | } |
| 532 | |
| 533 | free(reply); |
| 534 | |
| 535 | break; |
| 536 | } |
| 537 | } |
| 538 | } |
| 539 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
| 540 | char *libfile; |
| 541 | |
| 542 | libfile = nth_token(recvbuf, 1); |
| 543 | |
| 544 | DBG("load_probe_lib loading %s", libfile); |
| 545 | } |
| 546 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
| 547 | struct ltt_trace_struct *trace; |
| 548 | char trace_name[] = "auto"; |
| 549 | int i; |
| 550 | char *channel_name; |
| 551 | |
| 552 | DBG("get_subbuf"); |
| 553 | |
| 554 | channel_name = nth_token(recvbuf, 1); |
| 555 | if(channel_name == NULL) { |
| 556 | ERR("get_subbuf: cannot parse channel"); |
| 557 | goto next_cmd; |
| 558 | } |
| 559 | |
| 560 | ltt_lock_traces(); |
| 561 | trace = _ltt_trace_find(trace_name); |
| 562 | ltt_unlock_traces(); |
| 563 | |
| 564 | if(trace == NULL) { |
| 565 | ERR("cannot find trace!"); |
| 566 | return (void *)1; |
| 567 | } |
| 568 | |
| 569 | for(i=0; i<trace->nr_channels; i++) { |
| 570 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 571 | |
| 572 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 573 | struct rchan_buf *rbuf = rchan->buf; |
| 574 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; |
| 575 | struct blocked_consumer *bc; |
| 576 | |
| 577 | bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer)); |
| 578 | if(bc == NULL) { |
| 579 | ERR("malloc returned NULL"); |
| 580 | goto next_cmd; |
| 581 | } |
| 582 | bc->fd_consumer = src.fd; |
| 583 | bc->fd_producer = lttbuf->data_ready_fd_read; |
| 584 | bc->rbuf = rbuf; |
| 585 | bc->lttbuf = lttbuf; |
| 586 | bc->src = src; |
| 587 | bc->server = ustcomm_app.server; |
| 588 | |
| 589 | list_add(&bc->list, &blocked_consumers); |
| 590 | |
| 591 | break; |
| 592 | } |
| 593 | } |
| 594 | } |
| 595 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { |
| 596 | struct ltt_trace_struct *trace; |
| 597 | char trace_name[] = "auto"; |
| 598 | int i; |
| 599 | char *channel_name; |
| 600 | long consumed_old; |
| 601 | char *consumed_old_str; |
| 602 | char *endptr; |
| 603 | |
| 604 | DBG("put_subbuf"); |
| 605 | |
| 606 | channel_name = strdup_malloc(nth_token(recvbuf, 1)); |
| 607 | if(channel_name == NULL) { |
| 608 | ERR("put_subbuf_size: cannot parse channel"); |
| 609 | goto next_cmd; |
| 610 | } |
| 611 | |
| 612 | consumed_old_str = strdup_malloc(nth_token(recvbuf, 2)); |
| 613 | if(consumed_old_str == NULL) { |
| 614 | ERR("put_subbuf: cannot parse consumed_old"); |
| 615 | goto next_cmd; |
| 616 | } |
| 617 | consumed_old = strtol(consumed_old_str, &endptr, 10); |
| 618 | if(*endptr != '\0') { |
| 619 | ERR("put_subbuf: invalid value for consumed_old"); |
| 620 | goto next_cmd; |
| 621 | } |
| 622 | |
| 623 | ltt_lock_traces(); |
| 624 | trace = _ltt_trace_find(trace_name); |
| 625 | ltt_unlock_traces(); |
| 626 | |
| 627 | if(trace == NULL) { |
| 628 | ERR("cannot find trace!"); |
| 629 | return (void *)1; |
| 630 | } |
| 631 | |
| 632 | for(i=0; i<trace->nr_channels; i++) { |
| 633 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 634 | |
| 635 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 636 | struct rchan_buf *rbuf = rchan->buf; |
| 637 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; |
| 638 | char *reply; |
| 639 | long consumed_old=0; |
| 640 | |
| 641 | result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); |
| 642 | if(result < 0) { |
| 643 | WARN("ltt_do_put_subbuf: error (subbuf=%s)", channel_name); |
| 644 | asprintf(&reply, "%s", "ERROR"); |
| 645 | } |
| 646 | else { |
| 647 | DBG("ltt_do_put_subbuf: success (subbuf=%s)", channel_name); |
| 648 | asprintf(&reply, "%s", "OK"); |
| 649 | } |
| 650 | |
| 651 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 652 | if(result) { |
| 653 | ERR("listener: put_subbuf: ustcomm_send_reply failed"); |
| 654 | goto next_cmd; |
| 655 | } |
| 656 | |
| 657 | free(reply); |
| 658 | |
| 659 | break; |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | free(channel_name); |
| 664 | free(consumed_old_str); |
| 665 | } |
| 666 | else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) { |
| 667 | char *channel_slash_name = nth_token(recvbuf, 1); |
| 668 | char channel_name[256]=""; |
| 669 | char marker_name[256]=""; |
| 670 | |
| 671 | result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name); |
| 672 | |
| 673 | if(channel_name == NULL || marker_name == NULL) { |
| 674 | WARN("invalid marker name"); |
| 675 | goto next_cmd; |
| 676 | } |
| 677 | printf("%s %s\n", channel_name, marker_name); |
| 678 | |
| 679 | result = ltt_marker_connect(channel_name, marker_name, "default"); |
| 680 | if(result < 0) { |
| 681 | WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name); |
| 682 | } |
| 683 | } |
| 684 | else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) { |
| 685 | char *channel_slash_name = nth_token(recvbuf, 1); |
| 686 | char *marker_name; |
| 687 | char *channel_name; |
| 688 | |
| 689 | result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name); |
| 690 | |
| 691 | if(marker_name == NULL) { |
| 692 | } |
| 693 | printf("%s %s\n", channel_name, marker_name); |
| 694 | |
| 695 | result = ltt_marker_disconnect(channel_name, marker_name, "default"); |
| 696 | if(result < 0) { |
| 697 | WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name); |
| 698 | } |
| 699 | } |
| 700 | else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) { |
| 701 | char *reply; |
| 702 | |
| 703 | asprintf(&reply, "%lld", pidunique); |
| 704 | |
| 705 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 706 | if(result) { |
| 707 | ERR("listener: get_pidunique: ustcomm_send_reply failed"); |
| 708 | goto next_cmd; |
| 709 | } |
| 710 | |
| 711 | free(reply); |
| 712 | } |
| 713 | // else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { |
| 714 | // struct ltt_trace_struct *trace; |
| 715 | // char trace_name[] = "auto"; |
| 716 | // int i; |
| 717 | // char *channel_name; |
| 718 | // |
| 719 | // DBG("get_notifications"); |
| 720 | // |
| 721 | // channel_name = strdup_malloc(nth_token(recvbuf, 1)); |
| 722 | // if(channel_name == NULL) { |
| 723 | // ERR("put_subbuf_size: cannot parse channel"); |
| 724 | // goto next_cmd; |
| 725 | // } |
| 726 | // |
| 727 | // ltt_lock_traces(); |
| 728 | // trace = _ltt_trace_find(trace_name); |
| 729 | // ltt_unlock_traces(); |
| 730 | // |
| 731 | // if(trace == NULL) { |
| 732 | // ERR("cannot find trace!"); |
| 733 | // return (void *)1; |
| 734 | // } |
| 735 | // |
| 736 | // for(i=0; i<trace->nr_channels; i++) { |
| 737 | // struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 738 | // int fd; |
| 739 | // |
| 740 | // if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 741 | // struct rchan_buf *rbuf = rchan->buf; |
| 742 | // struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; |
| 743 | // |
| 744 | // result = fd = ustcomm_app_detach_client(&ustcomm_app, &src); |
| 745 | // if(result == -1) { |
| 746 | // ERR("ustcomm_app_detach_client failed"); |
| 747 | // goto next_cmd; |
| 748 | // } |
| 749 | // |
| 750 | // lttbuf->wake_consumer_arg = (void *) fd; |
| 751 | // |
| 752 | // smp_wmb(); |
| 753 | // |
| 754 | // lttbuf->call_wake_consumer = 1; |
| 755 | // |
| 756 | // break; |
| 757 | // } |
| 758 | // } |
| 759 | // |
| 760 | // free(channel_name); |
| 761 | // } |
| 762 | else { |
| 763 | ERR("unable to parse message: %s", recvbuf); |
| 764 | } |
| 765 | |
| 766 | next_cmd: |
| 767 | free(recvbuf); |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | volatile sig_atomic_t have_listener = 0; |
| 772 | |
| 773 | void create_listener(void) |
| 774 | { |
| 775 | #ifdef USE_CLONE |
| 776 | static char listener_stack[16384]; |
| 777 | int result; |
| 778 | #else |
| 779 | pthread_t thread; |
| 780 | #endif |
| 781 | |
| 782 | if(have_listener) { |
| 783 | WARN("not creating listener because we already had one"); |
| 784 | return; |
| 785 | } |
| 786 | |
| 787 | #ifdef USE_CLONE |
| 788 | result = clone((int (*)(void *)) listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
| 789 | if(result == -1) { |
| 790 | perror("clone"); |
| 791 | return; |
| 792 | } |
| 793 | #else |
| 794 | |
| 795 | pthread_create(&thread, NULL, listener_main, NULL); |
| 796 | #endif |
| 797 | |
| 798 | have_listener = 1; |
| 799 | } |
| 800 | |
| 801 | static int init_socket(void) |
| 802 | { |
| 803 | return ustcomm_init_app(getpid(), &ustcomm_app); |
| 804 | } |
| 805 | |
| 806 | #define AUTOPROBE_DISABLED 0 |
| 807 | #define AUTOPROBE_ENABLE_ALL 1 |
| 808 | #define AUTOPROBE_ENABLE_REGEX 2 |
| 809 | static int autoprobe_method = AUTOPROBE_DISABLED; |
| 810 | static regex_t autoprobe_regex; |
| 811 | |
| 812 | static void auto_probe_connect(struct marker *m) |
| 813 | { |
| 814 | int result; |
| 815 | |
| 816 | char* concat_name = NULL; |
| 817 | const char *probe_name = "default"; |
| 818 | |
| 819 | if(autoprobe_method == AUTOPROBE_DISABLED) { |
| 820 | return; |
| 821 | } |
| 822 | else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
| 823 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); |
| 824 | if(result == -1) { |
| 825 | ERR("auto_probe_connect: asprintf failed (marker %s/%s)", |
| 826 | m->channel, m->name); |
| 827 | return; |
| 828 | } |
| 829 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { |
| 830 | free(concat_name); |
| 831 | return; |
| 832 | } |
| 833 | free(concat_name); |
| 834 | } |
| 835 | |
| 836 | result = ltt_marker_connect(m->channel, m->name, probe_name); |
| 837 | if(result && result != -EEXIST) |
| 838 | ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result); |
| 839 | |
| 840 | DBG("auto connected marker %s %s to probe default", m->channel, m->name); |
| 841 | |
| 842 | } |
| 843 | |
| 844 | static void __attribute__((constructor)) init() |
| 845 | { |
| 846 | int result; |
| 847 | char* autoprobe_val = NULL; |
| 848 | |
| 849 | /* Assign the pidunique, to be able to differentiate the processes with same |
| 850 | * pid, (before and after an exec). |
| 851 | */ |
| 852 | pidunique = make_pidunique(); |
| 853 | |
| 854 | /* Initialize RCU in case the constructor order is not good. */ |
| 855 | urcu_init(); |
| 856 | |
| 857 | /* It is important to do this before events start to be generated. */ |
| 858 | ust_register_thread(); |
| 859 | |
| 860 | DBG("Tracectl constructor"); |
| 861 | |
| 862 | /* Must create socket before signal handler to prevent races. |
| 863 | */ |
| 864 | result = init_socket(); |
| 865 | if(result == -1) { |
| 866 | ERR("init_socket error"); |
| 867 | return; |
| 868 | } |
| 869 | |
| 870 | create_listener(); |
| 871 | |
| 872 | autoprobe_val = getenv("UST_AUTOPROBE"); |
| 873 | if(autoprobe_val) { |
| 874 | struct marker_iter iter; |
| 875 | |
| 876 | DBG("Autoprobe enabled."); |
| 877 | |
| 878 | /* Ensure markers are initialized */ |
| 879 | //init_markers(); |
| 880 | |
| 881 | /* Ensure marker control is initialized, for the probe */ |
| 882 | init_marker_control(); |
| 883 | |
| 884 | /* first, set the callback that will connect the |
| 885 | * probe on new markers |
| 886 | */ |
| 887 | if(autoprobe_val[0] == '/') { |
| 888 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); |
| 889 | if (result) { |
| 890 | char regexerr[150]; |
| 891 | |
| 892 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); |
| 893 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); |
| 894 | /* don't crash the application just for this */ |
| 895 | } |
| 896 | else { |
| 897 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; |
| 898 | } |
| 899 | } |
| 900 | else { |
| 901 | /* just enable all instrumentation */ |
| 902 | autoprobe_method = AUTOPROBE_ENABLE_ALL; |
| 903 | } |
| 904 | |
| 905 | marker_set_new_marker_cb(auto_probe_connect); |
| 906 | |
| 907 | /* Now, connect the probes that were already registered. */ |
| 908 | marker_iter_reset(&iter); |
| 909 | marker_iter_start(&iter); |
| 910 | |
| 911 | DBG("now iterating on markers already registered"); |
| 912 | while(iter.marker) { |
| 913 | DBG("now iterating on marker %s", iter.marker->name); |
| 914 | auto_probe_connect(iter.marker); |
| 915 | marker_iter_next(&iter); |
| 916 | } |
| 917 | } |
| 918 | |
| 919 | if(getenv("UST_TRACE")) { |
| 920 | char trace_name[] = "auto"; |
| 921 | char trace_type[] = "ustrelay"; |
| 922 | |
| 923 | DBG("starting early tracing"); |
| 924 | |
| 925 | /* Ensure marker control is initialized */ |
| 926 | init_marker_control(); |
| 927 | |
| 928 | /* Ensure relay is initialized */ |
| 929 | init_ustrelay_transport(); |
| 930 | |
| 931 | /* Ensure markers are initialized */ |
| 932 | init_markers(); |
| 933 | |
| 934 | /* In case. */ |
| 935 | ltt_channels_register("ust"); |
| 936 | |
| 937 | result = ltt_trace_setup(trace_name); |
| 938 | if(result < 0) { |
| 939 | ERR("ltt_trace_setup failed"); |
| 940 | return; |
| 941 | } |
| 942 | |
| 943 | result = ltt_trace_set_type(trace_name, trace_type); |
| 944 | if(result < 0) { |
| 945 | ERR("ltt_trace_set_type failed"); |
| 946 | return; |
| 947 | } |
| 948 | |
| 949 | result = ltt_trace_alloc(trace_name); |
| 950 | if(result < 0) { |
| 951 | ERR("ltt_trace_alloc failed"); |
| 952 | return; |
| 953 | } |
| 954 | |
| 955 | result = ltt_trace_start(trace_name); |
| 956 | if(result < 0) { |
| 957 | ERR("ltt_trace_start failed"); |
| 958 | return; |
| 959 | } |
| 960 | |
| 961 | /* Do this after the trace is started in order to avoid creating confusion |
| 962 | * if the trace fails to start. */ |
| 963 | inform_consumer_daemon(trace_name); |
| 964 | } |
| 965 | |
| 966 | |
| 967 | return; |
| 968 | |
| 969 | /* should decrementally destroy stuff if error */ |
| 970 | |
| 971 | } |
| 972 | |
| 973 | /* This is only called if we terminate normally, not with an unhandled signal, |
| 974 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
| 975 | * the last sub-buffer contain a valid end time for the trace. This is done |
| 976 | * automatically only when the trace is properly stopped. |
| 977 | * |
| 978 | * If the traced program crashed, it is always possible to manually add the |
| 979 | * right value in the header, or to open the trace in text mode. |
| 980 | * |
| 981 | * FIXME: Fix LTTV so it doesn't need this. |
| 982 | */ |
| 983 | |
| 984 | static void destroy_traces(void) |
| 985 | { |
| 986 | int result; |
| 987 | |
| 988 | /* if trace running, finish it */ |
| 989 | |
| 990 | DBG("destructor stopping traces"); |
| 991 | |
| 992 | result = ltt_trace_stop("auto"); |
| 993 | if(result == -1) { |
| 994 | ERR("ltt_trace_stop error"); |
| 995 | } |
| 996 | |
| 997 | result = ltt_trace_destroy("auto"); |
| 998 | if(result == -1) { |
| 999 | ERR("ltt_trace_destroy error"); |
| 1000 | } |
| 1001 | } |
| 1002 | |
| 1003 | static int trace_recording(void) |
| 1004 | { |
| 1005 | int retval = 0; |
| 1006 | struct ltt_trace_struct *trace; |
| 1007 | |
| 1008 | ltt_lock_traces(); |
| 1009 | |
| 1010 | list_for_each_entry(trace, <t_traces.head, list) { |
| 1011 | if(trace->active) { |
| 1012 | retval = 1; |
| 1013 | break; |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | ltt_unlock_traces(); |
| 1018 | |
| 1019 | return retval; |
| 1020 | } |
| 1021 | |
| 1022 | #if 0 |
| 1023 | static int have_consumer(void) |
| 1024 | { |
| 1025 | return !list_empty(&blocked_consumers); |
| 1026 | } |
| 1027 | #endif |
| 1028 | |
| 1029 | int restarting_usleep(useconds_t usecs) |
| 1030 | { |
| 1031 | struct timespec tv; |
| 1032 | int result; |
| 1033 | |
| 1034 | tv.tv_sec = 0; |
| 1035 | tv.tv_nsec = usecs * 1000; |
| 1036 | |
| 1037 | do { |
| 1038 | result = nanosleep(&tv, &tv); |
| 1039 | } while(result == -1 && errno == EINTR); |
| 1040 | |
| 1041 | return result; |
| 1042 | } |
| 1043 | |
| 1044 | /* This destructor keeps the process alive for a few seconds in order |
| 1045 | * to leave time to ustd to connect to its buffers. This is necessary |
| 1046 | * for programs whose execution is very short. It is also useful in all |
| 1047 | * programs when tracing is started close to the end of the program |
| 1048 | * execution. |
| 1049 | * |
| 1050 | * FIXME: For now, this only works for the first trace created in a |
| 1051 | * process. |
| 1052 | */ |
| 1053 | |
| 1054 | static void __attribute__((destructor)) keepalive() |
| 1055 | { |
| 1056 | if(trace_recording() && buffers_to_export) { |
| 1057 | int total = 0; |
| 1058 | DBG("Keeping process alive for consumer daemon..."); |
| 1059 | while(buffers_to_export) { |
| 1060 | const int interv = 200000; |
| 1061 | restarting_usleep(interv); |
| 1062 | total += interv; |
| 1063 | |
| 1064 | if(total >= 3000000) { |
| 1065 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
| 1066 | break; |
| 1067 | } |
| 1068 | } |
| 1069 | DBG("Finally dying..."); |
| 1070 | } |
| 1071 | |
| 1072 | destroy_traces(); |
| 1073 | |
| 1074 | ustcomm_fini_app(&ustcomm_app); |
| 1075 | } |
| 1076 | |
| 1077 | void ust_potential_exec(void) |
| 1078 | { |
| 1079 | trace_mark(ust, potential_exec, MARK_NOARGS); |
| 1080 | |
| 1081 | DBG("test"); |
| 1082 | |
| 1083 | keepalive(); |
| 1084 | } |
| 1085 | |
| 1086 | /* Notify ust that there was a fork. This needs to be called inside |
| 1087 | * the new process, anytime a process whose memory is not shared with |
| 1088 | * the parent is created. If this function is not called, the events |
| 1089 | * of the new process will not be collected. |
| 1090 | */ |
| 1091 | |
| 1092 | void ust_fork(void) |
| 1093 | { |
| 1094 | struct blocked_consumer *bc; |
| 1095 | struct blocked_consumer *deletable_bc = NULL; |
| 1096 | int result; |
| 1097 | |
| 1098 | DBG("ust: forking"); |
| 1099 | ltt_trace_stop("auto"); |
| 1100 | ltt_trace_destroy("auto"); |
| 1101 | /* Delete all active connections */ |
| 1102 | ustcomm_close_all_connections(&ustcomm_app.server); |
| 1103 | |
| 1104 | /* Delete all blocked consumers */ |
| 1105 | list_for_each_entry(bc, &blocked_consumers, list) { |
| 1106 | close(bc->fd_producer); |
| 1107 | close(bc->fd_consumer); |
| 1108 | free(deletable_bc); |
| 1109 | deletable_bc = bc; |
| 1110 | list_del(&bc->list); |
| 1111 | } |
| 1112 | |
| 1113 | have_listener = 0; |
| 1114 | create_listener(); |
| 1115 | init_socket(); |
| 1116 | ltt_trace_setup("auto"); |
| 1117 | result = ltt_trace_set_type("auto", "ustrelay"); |
| 1118 | if(result < 0) { |
| 1119 | ERR("ltt_trace_set_type failed"); |
| 1120 | return; |
| 1121 | } |
| 1122 | |
| 1123 | ltt_trace_alloc("auto"); |
| 1124 | ltt_trace_start("auto"); |
| 1125 | inform_consumer_daemon("auto"); |
| 1126 | } |
| 1127 | |