| 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 | /* This file contains the implementation of the UST listener thread, which |
| 19 | * receives trace control commands. It also coordinates the initialization of |
| 20 | * libust. |
| 21 | */ |
| 22 | |
| 23 | #define _GNU_SOURCE |
| 24 | #define _LGPL_SOURCE |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <stdint.h> |
| 28 | #include <pthread.h> |
| 29 | #include <signal.h> |
| 30 | #include <sys/epoll.h> |
| 31 | #include <sys/time.h> |
| 32 | #include <sys/types.h> |
| 33 | #include <sys/socket.h> |
| 34 | #include <fcntl.h> |
| 35 | #include <poll.h> |
| 36 | #include <regex.h> |
| 37 | #include <urcu/uatomic_arch.h> |
| 38 | #include <urcu/list.h> |
| 39 | |
| 40 | #include <ust/marker.h> |
| 41 | #include <ust/tracepoint.h> |
| 42 | #include <ust/tracepoint-internal.h> |
| 43 | #include <ust/tracectl.h> |
| 44 | #include <ust/clock.h> |
| 45 | #include "tracer.h" |
| 46 | #include "usterr_signal_safe.h" |
| 47 | #include "ustcomm.h" |
| 48 | #include "buffers.h" |
| 49 | #include "marker-control.h" |
| 50 | |
| 51 | /* This should only be accessed by the constructor, before the creation |
| 52 | * of the listener, and then only by the listener. |
| 53 | */ |
| 54 | s64 pidunique = -1LL; |
| 55 | |
| 56 | /* The process pid is used to detect a non-traceable fork |
| 57 | * and allow the non-traceable fork to be ignored |
| 58 | * by destructor sequences in libust |
| 59 | */ |
| 60 | static pid_t processpid = 0; |
| 61 | |
| 62 | static struct ustcomm_header _receive_header; |
| 63 | static struct ustcomm_header *receive_header = &_receive_header; |
| 64 | static char receive_buffer[USTCOMM_BUFFER_SIZE]; |
| 65 | static char send_buffer[USTCOMM_BUFFER_SIZE]; |
| 66 | |
| 67 | static int epoll_fd; |
| 68 | |
| 69 | /* |
| 70 | * Listener thread data vs fork() protection mechanism. Ensures that no listener |
| 71 | * thread mutexes and data structures are being concurrently modified or held by |
| 72 | * other threads when fork() is executed. |
| 73 | */ |
| 74 | static pthread_mutex_t listener_thread_data_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 75 | |
| 76 | /* Mutex protecting listen_sock. Nests inside listener_thread_data_mutex. */ |
| 77 | static pthread_mutex_t listen_sock_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 78 | static struct ustcomm_sock *listen_sock; |
| 79 | |
| 80 | extern struct chan_info_struct chan_infos[]; |
| 81 | |
| 82 | static struct cds_list_head ust_socks = CDS_LIST_HEAD_INIT(ust_socks); |
| 83 | |
| 84 | /* volatile because shared between the listener and the main thread */ |
| 85 | int buffers_to_export = 0; |
| 86 | |
| 87 | int ust_clock_source; |
| 88 | |
| 89 | static long long make_pidunique(void) |
| 90 | { |
| 91 | s64 retval; |
| 92 | struct timeval tv; |
| 93 | |
| 94 | gettimeofday(&tv, NULL); |
| 95 | |
| 96 | retval = tv.tv_sec; |
| 97 | retval <<= 32; |
| 98 | retval |= tv.tv_usec; |
| 99 | |
| 100 | return retval; |
| 101 | } |
| 102 | |
| 103 | static void print_ust_marker(FILE *fp) |
| 104 | { |
| 105 | struct ust_marker_iter iter; |
| 106 | |
| 107 | ust_marker_iter_reset(&iter); |
| 108 | ust_marker_iter_start(&iter); |
| 109 | |
| 110 | while (iter.ust_marker) { |
| 111 | fprintf(fp, "ust_marker: %s/%s %d \"%s\" %p\n", |
| 112 | (*iter.ust_marker)->channel, |
| 113 | (*iter.ust_marker)->name, |
| 114 | (int)(*iter.ust_marker)->state, |
| 115 | (*iter.ust_marker)->format, |
| 116 | NULL); /* |
| 117 | * location is null for now, will be added |
| 118 | * to a different table. |
| 119 | */ |
| 120 | ust_marker_iter_next(&iter); |
| 121 | } |
| 122 | ust_marker_iter_stop(&iter); |
| 123 | } |
| 124 | |
| 125 | static void print_trace_events(FILE *fp) |
| 126 | { |
| 127 | struct trace_event_iter iter; |
| 128 | |
| 129 | lock_trace_events(); |
| 130 | trace_event_iter_reset(&iter); |
| 131 | trace_event_iter_start(&iter); |
| 132 | |
| 133 | while (iter.trace_event) { |
| 134 | fprintf(fp, "trace_event: %s\n", (*iter.trace_event)->name); |
| 135 | trace_event_iter_next(&iter); |
| 136 | } |
| 137 | unlock_trace_events(); |
| 138 | } |
| 139 | |
| 140 | static int connect_ustconsumer(void) |
| 141 | { |
| 142 | int result, fd; |
| 143 | char default_daemon_path[] = SOCK_DIR "/ustconsumer"; |
| 144 | char *explicit_daemon_path, *daemon_path; |
| 145 | |
| 146 | explicit_daemon_path = getenv("UST_DAEMON_SOCKET"); |
| 147 | if (explicit_daemon_path) { |
| 148 | daemon_path = explicit_daemon_path; |
| 149 | } else { |
| 150 | daemon_path = default_daemon_path; |
| 151 | } |
| 152 | |
| 153 | DBG("Connecting to daemon_path %s", daemon_path); |
| 154 | |
| 155 | result = ustcomm_connect_path(daemon_path, &fd); |
| 156 | if (result < 0) { |
| 157 | WARN("connect_ustconsumer failed, daemon_path: %s", |
| 158 | daemon_path); |
| 159 | return result; |
| 160 | } |
| 161 | |
| 162 | return fd; |
| 163 | } |
| 164 | |
| 165 | |
| 166 | static void request_buffer_consumer(int sock, |
| 167 | const char *trace, |
| 168 | const char *channel, |
| 169 | int cpu) |
| 170 | { |
| 171 | struct ustcomm_header send_header, recv_header; |
| 172 | struct ustcomm_buffer_info buf_inf; |
| 173 | int result = 0; |
| 174 | |
| 175 | result = ustcomm_pack_buffer_info(&send_header, |
| 176 | &buf_inf, |
| 177 | trace, |
| 178 | channel, |
| 179 | cpu); |
| 180 | |
| 181 | if (result < 0) { |
| 182 | ERR("failed to pack buffer info message %s_%d", |
| 183 | channel, cpu); |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | buf_inf.pid = getpid(); |
| 188 | send_header.command = CONSUME_BUFFER; |
| 189 | |
| 190 | result = ustcomm_req(sock, &send_header, (char *) &buf_inf, |
| 191 | &recv_header, NULL); |
| 192 | if (result <= 0) { |
| 193 | PERROR("request for buffer consumer failed, is the daemon online?"); |
| 194 | } |
| 195 | |
| 196 | return; |
| 197 | } |
| 198 | |
| 199 | /* Ask the daemon to collect a trace called trace_name and being |
| 200 | * produced by this pid. |
| 201 | * |
| 202 | * The trace must be at least allocated. (It can also be started.) |
| 203 | * This is because _ltt_trace_find is used. |
| 204 | */ |
| 205 | |
| 206 | static void inform_consumer_daemon(const char *trace_name) |
| 207 | { |
| 208 | int sock, i,j; |
| 209 | struct ust_trace *trace; |
| 210 | const char *ch_name; |
| 211 | |
| 212 | sock = connect_ustconsumer(); |
| 213 | if (sock < 0) { |
| 214 | return; |
| 215 | } |
| 216 | |
| 217 | DBG("Connected to ustconsumer"); |
| 218 | |
| 219 | ltt_lock_traces(); |
| 220 | |
| 221 | trace = _ltt_trace_find(trace_name); |
| 222 | if (trace == NULL) { |
| 223 | WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name); |
| 224 | goto unlock_traces; |
| 225 | } |
| 226 | |
| 227 | for (i=0; i < trace->nr_channels; i++) { |
| 228 | if (trace->channels[i].request_collection) { |
| 229 | /* iterate on all cpus */ |
| 230 | for (j=0; j<trace->channels[i].n_cpus; j++) { |
| 231 | ch_name = trace->channels[i].channel_name; |
| 232 | request_buffer_consumer(sock, trace_name, |
| 233 | ch_name, j); |
| 234 | CMM_STORE_SHARED(buffers_to_export, |
| 235 | CMM_LOAD_SHARED(buffers_to_export)+1); |
| 236 | } |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | unlock_traces: |
| 241 | ltt_unlock_traces(); |
| 242 | |
| 243 | close(sock); |
| 244 | } |
| 245 | |
| 246 | static struct ust_channel *find_channel(const char *ch_name, |
| 247 | struct ust_trace *trace) |
| 248 | { |
| 249 | int i; |
| 250 | |
| 251 | for (i=0; i<trace->nr_channels; i++) { |
| 252 | if (!strcmp(trace->channels[i].channel_name, ch_name)) { |
| 253 | return &trace->channels[i]; |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | return NULL; |
| 258 | } |
| 259 | |
| 260 | static int get_buffer_shmid_pipe_fd(const char *trace_name, const char *ch_name, |
| 261 | int ch_cpu, |
| 262 | int *buf_shmid, |
| 263 | int *buf_struct_shmid, |
| 264 | int *buf_pipe_fd) |
| 265 | { |
| 266 | struct ust_trace *trace; |
| 267 | struct ust_channel *channel; |
| 268 | struct ust_buffer *buf; |
| 269 | |
| 270 | DBG("get_buffer_shmid_pipe_fd"); |
| 271 | |
| 272 | ltt_lock_traces(); |
| 273 | trace = _ltt_trace_find(trace_name); |
| 274 | ltt_unlock_traces(); |
| 275 | |
| 276 | if (trace == NULL) { |
| 277 | ERR("cannot find trace!"); |
| 278 | return -ENODATA; |
| 279 | } |
| 280 | |
| 281 | channel = find_channel(ch_name, trace); |
| 282 | if (!channel) { |
| 283 | ERR("cannot find channel %s!", ch_name); |
| 284 | return -ENODATA; |
| 285 | } |
| 286 | |
| 287 | buf = channel->buf[ch_cpu]; |
| 288 | |
| 289 | *buf_shmid = buf->shmid; |
| 290 | *buf_struct_shmid = channel->buf_struct_shmids[ch_cpu]; |
| 291 | *buf_pipe_fd = buf->data_ready_fd_read; |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | static int get_subbuf_num_size(const char *trace_name, const char *ch_name, |
| 297 | int *num, int *size) |
| 298 | { |
| 299 | struct ust_trace *trace; |
| 300 | struct ust_channel *channel; |
| 301 | |
| 302 | DBG("get_subbuf_size"); |
| 303 | |
| 304 | ltt_lock_traces(); |
| 305 | trace = _ltt_trace_find(trace_name); |
| 306 | ltt_unlock_traces(); |
| 307 | |
| 308 | if (!trace) { |
| 309 | ERR("cannot find trace!"); |
| 310 | return -ENODATA; |
| 311 | } |
| 312 | |
| 313 | channel = find_channel(ch_name, trace); |
| 314 | if (!channel) { |
| 315 | ERR("unable to find channel"); |
| 316 | return -ENODATA; |
| 317 | } |
| 318 | |
| 319 | *num = channel->subbuf_cnt; |
| 320 | *size = channel->subbuf_size; |
| 321 | |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | /* Return the power of two which is equal or higher to v */ |
| 326 | |
| 327 | static unsigned int pow2_higher_or_eq(unsigned int v) |
| 328 | { |
| 329 | int hb = fls(v); |
| 330 | int retval = 1<<(hb-1); |
| 331 | |
| 332 | if (v-retval == 0) |
| 333 | return retval; |
| 334 | else |
| 335 | return retval<<1; |
| 336 | } |
| 337 | |
| 338 | static int set_subbuf_size(const char *trace_name, const char *ch_name, |
| 339 | unsigned int size) |
| 340 | { |
| 341 | unsigned int power; |
| 342 | int retval = 0; |
| 343 | struct ust_trace *trace; |
| 344 | struct ust_channel *channel; |
| 345 | |
| 346 | DBG("set_subbuf_size"); |
| 347 | |
| 348 | power = pow2_higher_or_eq(size); |
| 349 | power = max_t(unsigned int, 2u, power); |
| 350 | if (power != size) { |
| 351 | WARN("using the next power of two for buffer size = %u\n", power); |
| 352 | } |
| 353 | |
| 354 | ltt_lock_traces(); |
| 355 | trace = _ltt_trace_find_setup(trace_name); |
| 356 | if (trace == NULL) { |
| 357 | ERR("cannot find trace!"); |
| 358 | retval = -ENODATA; |
| 359 | goto unlock_traces; |
| 360 | } |
| 361 | |
| 362 | channel = find_channel(ch_name, trace); |
| 363 | if (!channel) { |
| 364 | ERR("unable to find channel"); |
| 365 | retval = -ENODATA; |
| 366 | goto unlock_traces; |
| 367 | } |
| 368 | |
| 369 | channel->subbuf_size = power; |
| 370 | DBG("the set_subbuf_size for the requested channel is %zu", channel->subbuf_size); |
| 371 | |
| 372 | unlock_traces: |
| 373 | ltt_unlock_traces(); |
| 374 | |
| 375 | return retval; |
| 376 | } |
| 377 | |
| 378 | static int set_subbuf_num(const char *trace_name, const char *ch_name, |
| 379 | unsigned int num) |
| 380 | { |
| 381 | struct ust_trace *trace; |
| 382 | struct ust_channel *channel; |
| 383 | int retval = 0; |
| 384 | |
| 385 | DBG("set_subbuf_num"); |
| 386 | |
| 387 | if (num < 2) { |
| 388 | ERR("subbuffer count should be greater than 2"); |
| 389 | return -EINVAL; |
| 390 | } |
| 391 | |
| 392 | ltt_lock_traces(); |
| 393 | trace = _ltt_trace_find_setup(trace_name); |
| 394 | if (trace == NULL) { |
| 395 | ERR("cannot find trace!"); |
| 396 | retval = -ENODATA; |
| 397 | goto unlock_traces; |
| 398 | } |
| 399 | |
| 400 | channel = find_channel(ch_name, trace); |
| 401 | if (!channel) { |
| 402 | ERR("unable to find channel"); |
| 403 | retval = -ENODATA; |
| 404 | goto unlock_traces; |
| 405 | } |
| 406 | |
| 407 | channel->subbuf_cnt = num; |
| 408 | DBG("the set_subbuf_cnt for the requested channel is %u", channel->subbuf_cnt); |
| 409 | |
| 410 | unlock_traces: |
| 411 | ltt_unlock_traces(); |
| 412 | return retval; |
| 413 | } |
| 414 | |
| 415 | static int get_subbuffer(const char *trace_name, const char *ch_name, |
| 416 | int ch_cpu, long *consumed_old) |
| 417 | { |
| 418 | int retval = 0; |
| 419 | struct ust_trace *trace; |
| 420 | struct ust_channel *channel; |
| 421 | struct ust_buffer *buf; |
| 422 | |
| 423 | DBG("get_subbuf"); |
| 424 | |
| 425 | *consumed_old = 0; |
| 426 | |
| 427 | ltt_lock_traces(); |
| 428 | trace = _ltt_trace_find(trace_name); |
| 429 | |
| 430 | if (!trace) { |
| 431 | DBG("Cannot find trace. It was likely destroyed by the user."); |
| 432 | retval = -ENODATA; |
| 433 | goto unlock_traces; |
| 434 | } |
| 435 | |
| 436 | channel = find_channel(ch_name, trace); |
| 437 | if (!channel) { |
| 438 | ERR("unable to find channel"); |
| 439 | retval = -ENODATA; |
| 440 | goto unlock_traces; |
| 441 | } |
| 442 | |
| 443 | buf = channel->buf[ch_cpu]; |
| 444 | |
| 445 | retval = ust_buffers_get_subbuf(buf, consumed_old); |
| 446 | if (retval < 0) { |
| 447 | WARN("missed buffer?"); |
| 448 | } |
| 449 | |
| 450 | unlock_traces: |
| 451 | ltt_unlock_traces(); |
| 452 | |
| 453 | return retval; |
| 454 | } |
| 455 | |
| 456 | |
| 457 | static int notify_buffer_mapped(const char *trace_name, |
| 458 | const char *ch_name, |
| 459 | int ch_cpu) |
| 460 | { |
| 461 | int retval = 0; |
| 462 | struct ust_trace *trace; |
| 463 | struct ust_channel *channel; |
| 464 | struct ust_buffer *buf; |
| 465 | |
| 466 | DBG("get_buffer_fd"); |
| 467 | |
| 468 | ltt_lock_traces(); |
| 469 | trace = _ltt_trace_find(trace_name); |
| 470 | |
| 471 | if (!trace) { |
| 472 | retval = -ENODATA; |
| 473 | DBG("Cannot find trace. It was likely destroyed by the user."); |
| 474 | goto unlock_traces; |
| 475 | } |
| 476 | |
| 477 | channel = find_channel(ch_name, trace); |
| 478 | if (!channel) { |
| 479 | retval = -ENODATA; |
| 480 | ERR("unable to find channel"); |
| 481 | goto unlock_traces; |
| 482 | } |
| 483 | |
| 484 | buf = channel->buf[ch_cpu]; |
| 485 | |
| 486 | /* Being here is the proof the daemon has mapped the buffer in its |
| 487 | * memory. We may now decrement buffers_to_export. |
| 488 | */ |
| 489 | if (uatomic_read(&buf->consumed) == 0) { |
| 490 | DBG("decrementing buffers_to_export"); |
| 491 | CMM_STORE_SHARED(buffers_to_export, CMM_LOAD_SHARED(buffers_to_export)-1); |
| 492 | } |
| 493 | |
| 494 | unlock_traces: |
| 495 | ltt_unlock_traces(); |
| 496 | |
| 497 | return retval; |
| 498 | } |
| 499 | |
| 500 | static int put_subbuffer(const char *trace_name, const char *ch_name, |
| 501 | int ch_cpu, long consumed_old) |
| 502 | { |
| 503 | int retval = 0; |
| 504 | struct ust_trace *trace; |
| 505 | struct ust_channel *channel; |
| 506 | struct ust_buffer *buf; |
| 507 | |
| 508 | DBG("put_subbuf"); |
| 509 | |
| 510 | ltt_lock_traces(); |
| 511 | trace = _ltt_trace_find(trace_name); |
| 512 | |
| 513 | if (!trace) { |
| 514 | retval = -ENODATA; |
| 515 | DBG("Cannot find trace. It was likely destroyed by the user."); |
| 516 | goto unlock_traces; |
| 517 | } |
| 518 | |
| 519 | channel = find_channel(ch_name, trace); |
| 520 | if (!channel) { |
| 521 | retval = -ENODATA; |
| 522 | ERR("unable to find channel"); |
| 523 | goto unlock_traces; |
| 524 | } |
| 525 | |
| 526 | buf = channel->buf[ch_cpu]; |
| 527 | |
| 528 | retval = ust_buffers_put_subbuf(buf, consumed_old); |
| 529 | if (retval < 0) { |
| 530 | WARN("ust_buffers_put_subbuf: error (subbuf=%s_%d)", |
| 531 | ch_name, ch_cpu); |
| 532 | } else { |
| 533 | DBG("ust_buffers_put_subbuf: success (subbuf=%s_%d)", |
| 534 | ch_name, ch_cpu); |
| 535 | } |
| 536 | |
| 537 | unlock_traces: |
| 538 | ltt_unlock_traces(); |
| 539 | |
| 540 | return retval; |
| 541 | } |
| 542 | |
| 543 | static void release_listener_mutex(void *ptr) |
| 544 | { |
| 545 | pthread_mutex_unlock(&listener_thread_data_mutex); |
| 546 | } |
| 547 | |
| 548 | static void listener_cleanup(void *ptr) |
| 549 | { |
| 550 | pthread_mutex_lock(&listen_sock_mutex); |
| 551 | if (listen_sock) { |
| 552 | ustcomm_del_named_sock(listen_sock, 0); |
| 553 | listen_sock = NULL; |
| 554 | } |
| 555 | pthread_mutex_unlock(&listen_sock_mutex); |
| 556 | } |
| 557 | |
| 558 | static int force_subbuf_switch(const char *trace_name) |
| 559 | { |
| 560 | struct ust_trace *trace; |
| 561 | int i, j, retval = 0; |
| 562 | |
| 563 | ltt_lock_traces(); |
| 564 | trace = _ltt_trace_find(trace_name); |
| 565 | if (!trace) { |
| 566 | retval = -ENODATA; |
| 567 | DBG("Cannot find trace. It was likely destroyed by the user."); |
| 568 | goto unlock_traces; |
| 569 | } |
| 570 | |
| 571 | for (i = 0; i < trace->nr_channels; i++) { |
| 572 | for (j = 0; j < trace->channels[i].n_cpus; j++) { |
| 573 | ltt_force_switch(trace->channels[i].buf[j], |
| 574 | FORCE_FLUSH); |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | unlock_traces: |
| 579 | ltt_unlock_traces(); |
| 580 | |
| 581 | return retval; |
| 582 | } |
| 583 | |
| 584 | static int process_trace_cmd(int command, char *trace_name) |
| 585 | { |
| 586 | int result; |
| 587 | char trace_type[] = "ustrelay"; |
| 588 | |
| 589 | switch(command) { |
| 590 | case START: |
| 591 | /* start is an operation that setups the trace, allocates it and starts it */ |
| 592 | result = ltt_trace_setup(trace_name); |
| 593 | if (result < 0) { |
| 594 | ERR("ltt_trace_setup failed"); |
| 595 | return result; |
| 596 | } |
| 597 | |
| 598 | result = ltt_trace_set_type(trace_name, trace_type); |
| 599 | if (result < 0) { |
| 600 | ERR("ltt_trace_set_type failed"); |
| 601 | return result; |
| 602 | } |
| 603 | |
| 604 | result = ltt_trace_alloc(trace_name); |
| 605 | if (result < 0) { |
| 606 | ERR("ltt_trace_alloc failed"); |
| 607 | return result; |
| 608 | } |
| 609 | |
| 610 | inform_consumer_daemon(trace_name); |
| 611 | |
| 612 | result = ltt_trace_start(trace_name); |
| 613 | if (result < 0) { |
| 614 | ERR("ltt_trace_start failed"); |
| 615 | return result; |
| 616 | } |
| 617 | |
| 618 | return 0; |
| 619 | case SETUP_TRACE: |
| 620 | DBG("trace setup"); |
| 621 | |
| 622 | result = ltt_trace_setup(trace_name); |
| 623 | if (result < 0) { |
| 624 | ERR("ltt_trace_setup failed"); |
| 625 | return result; |
| 626 | } |
| 627 | |
| 628 | result = ltt_trace_set_type(trace_name, trace_type); |
| 629 | if (result < 0) { |
| 630 | ERR("ltt_trace_set_type failed"); |
| 631 | return result; |
| 632 | } |
| 633 | |
| 634 | return 0; |
| 635 | case ALLOC_TRACE: |
| 636 | DBG("trace alloc"); |
| 637 | |
| 638 | result = ltt_trace_alloc(trace_name); |
| 639 | if (result < 0) { |
| 640 | ERR("ltt_trace_alloc failed"); |
| 641 | return result; |
| 642 | } |
| 643 | inform_consumer_daemon(trace_name); |
| 644 | |
| 645 | return 0; |
| 646 | |
| 647 | case CREATE_TRACE: |
| 648 | DBG("trace create"); |
| 649 | |
| 650 | result = ltt_trace_setup(trace_name); |
| 651 | if (result < 0) { |
| 652 | ERR("ltt_trace_setup failed"); |
| 653 | return result; |
| 654 | } |
| 655 | |
| 656 | result = ltt_trace_set_type(trace_name, trace_type); |
| 657 | if (result < 0) { |
| 658 | ERR("ltt_trace_set_type failed"); |
| 659 | return result; |
| 660 | } |
| 661 | |
| 662 | return 0; |
| 663 | case START_TRACE: |
| 664 | DBG("trace start"); |
| 665 | |
| 666 | result = ltt_trace_alloc(trace_name); |
| 667 | if (result < 0) { |
| 668 | ERR("ltt_trace_alloc failed"); |
| 669 | return result; |
| 670 | } |
| 671 | if (!result) { |
| 672 | inform_consumer_daemon(trace_name); |
| 673 | } |
| 674 | |
| 675 | result = ltt_trace_start(trace_name); |
| 676 | if (result < 0) { |
| 677 | ERR("ltt_trace_start failed"); |
| 678 | return result; |
| 679 | } |
| 680 | |
| 681 | return 0; |
| 682 | case STOP_TRACE: |
| 683 | DBG("trace stop"); |
| 684 | |
| 685 | result = ltt_trace_stop(trace_name); |
| 686 | if (result < 0) { |
| 687 | ERR("ltt_trace_stop failed"); |
| 688 | return result; |
| 689 | } |
| 690 | |
| 691 | return 0; |
| 692 | case DESTROY_TRACE: |
| 693 | DBG("trace destroy"); |
| 694 | |
| 695 | result = ltt_trace_destroy(trace_name, 0); |
| 696 | if (result < 0) { |
| 697 | ERR("ltt_trace_destroy failed"); |
| 698 | return result; |
| 699 | } |
| 700 | return 0; |
| 701 | case FORCE_SUBBUF_SWITCH: |
| 702 | DBG("force switch"); |
| 703 | |
| 704 | result = force_subbuf_switch(trace_name); |
| 705 | if (result < 0) { |
| 706 | ERR("force_subbuf_switch failed"); |
| 707 | return result; |
| 708 | } |
| 709 | return 0; |
| 710 | } |
| 711 | |
| 712 | return 0; |
| 713 | } |
| 714 | |
| 715 | |
| 716 | static void process_channel_cmd(int sock, int command, |
| 717 | struct ustcomm_channel_info *ch_inf) |
| 718 | { |
| 719 | struct ustcomm_header _reply_header; |
| 720 | struct ustcomm_header *reply_header = &_reply_header; |
| 721 | struct ustcomm_channel_info *reply_msg = |
| 722 | (struct ustcomm_channel_info *)send_buffer; |
| 723 | int result, offset = 0, num, size; |
| 724 | |
| 725 | memset(reply_header, 0, sizeof(*reply_header)); |
| 726 | |
| 727 | switch (command) { |
| 728 | case GET_SUBBUF_NUM_SIZE: |
| 729 | result = get_subbuf_num_size(ch_inf->trace, |
| 730 | ch_inf->channel, |
| 731 | &num, &size); |
| 732 | if (result < 0) { |
| 733 | reply_header->result = result; |
| 734 | break; |
| 735 | } |
| 736 | |
| 737 | reply_msg->channel = USTCOMM_POISON_PTR; |
| 738 | reply_msg->subbuf_num = num; |
| 739 | reply_msg->subbuf_size = size; |
| 740 | |
| 741 | |
| 742 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); |
| 743 | |
| 744 | break; |
| 745 | case SET_SUBBUF_NUM: |
| 746 | reply_header->result = set_subbuf_num(ch_inf->trace, |
| 747 | ch_inf->channel, |
| 748 | ch_inf->subbuf_num); |
| 749 | |
| 750 | break; |
| 751 | case SET_SUBBUF_SIZE: |
| 752 | reply_header->result = set_subbuf_size(ch_inf->trace, |
| 753 | ch_inf->channel, |
| 754 | ch_inf->subbuf_size); |
| 755 | |
| 756 | |
| 757 | break; |
| 758 | } |
| 759 | if (ustcomm_send(sock, reply_header, (char *)reply_msg) < 0) { |
| 760 | ERR("ustcomm_send failed"); |
| 761 | } |
| 762 | } |
| 763 | |
| 764 | static void process_buffer_cmd(int sock, int command, |
| 765 | struct ustcomm_buffer_info *buf_inf) |
| 766 | { |
| 767 | struct ustcomm_header _reply_header; |
| 768 | struct ustcomm_header *reply_header = &_reply_header; |
| 769 | struct ustcomm_buffer_info *reply_msg = |
| 770 | (struct ustcomm_buffer_info *)send_buffer; |
| 771 | int result, offset = 0, buf_shmid, buf_struct_shmid, buf_pipe_fd; |
| 772 | long consumed_old; |
| 773 | |
| 774 | memset(reply_header, 0, sizeof(*reply_header)); |
| 775 | |
| 776 | switch (command) { |
| 777 | case GET_BUF_SHMID_PIPE_FD: |
| 778 | result = get_buffer_shmid_pipe_fd(buf_inf->trace, |
| 779 | buf_inf->channel, |
| 780 | buf_inf->ch_cpu, |
| 781 | &buf_shmid, |
| 782 | &buf_struct_shmid, |
| 783 | &buf_pipe_fd); |
| 784 | if (result < 0) { |
| 785 | reply_header->result = result; |
| 786 | break; |
| 787 | } |
| 788 | |
| 789 | reply_msg->channel = USTCOMM_POISON_PTR; |
| 790 | reply_msg->buf_shmid = buf_shmid; |
| 791 | reply_msg->buf_struct_shmid = buf_struct_shmid; |
| 792 | |
| 793 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); |
| 794 | reply_header->fd_included = 1; |
| 795 | |
| 796 | if (ustcomm_send_fd(sock, reply_header, (char *)reply_msg, |
| 797 | &buf_pipe_fd) < 0) { |
| 798 | ERR("ustcomm_send failed"); |
| 799 | } |
| 800 | return; |
| 801 | |
| 802 | case NOTIFY_BUF_MAPPED: |
| 803 | reply_header->result = |
| 804 | notify_buffer_mapped(buf_inf->trace, |
| 805 | buf_inf->channel, |
| 806 | buf_inf->ch_cpu); |
| 807 | break; |
| 808 | case GET_SUBBUFFER: |
| 809 | result = get_subbuffer(buf_inf->trace, buf_inf->channel, |
| 810 | buf_inf->ch_cpu, &consumed_old); |
| 811 | if (result < 0) { |
| 812 | reply_header->result = result; |
| 813 | break; |
| 814 | } |
| 815 | |
| 816 | reply_msg->channel = USTCOMM_POISON_PTR; |
| 817 | reply_msg->consumed_old = consumed_old; |
| 818 | |
| 819 | reply_header->size = COMPUTE_MSG_SIZE(reply_msg, offset); |
| 820 | |
| 821 | break; |
| 822 | case PUT_SUBBUFFER: |
| 823 | result = put_subbuffer(buf_inf->trace, buf_inf->channel, |
| 824 | buf_inf->ch_cpu, |
| 825 | buf_inf->consumed_old); |
| 826 | reply_header->result = result; |
| 827 | |
| 828 | break; |
| 829 | } |
| 830 | |
| 831 | if (ustcomm_send(sock, reply_header, (char *)reply_msg) < 0) { |
| 832 | ERR("ustcomm_send failed"); |
| 833 | } |
| 834 | |
| 835 | } |
| 836 | |
| 837 | static void process_ust_marker_cmd(int sock, int command, |
| 838 | struct ustcomm_ust_marker_info *ust_marker_inf) |
| 839 | { |
| 840 | struct ustcomm_header _reply_header; |
| 841 | struct ustcomm_header *reply_header = &_reply_header; |
| 842 | int result = 0; |
| 843 | |
| 844 | memset(reply_header, 0, sizeof(*reply_header)); |
| 845 | |
| 846 | switch(command) { |
| 847 | case ENABLE_MARKER: |
| 848 | |
| 849 | result = ltt_ust_marker_connect(ust_marker_inf->channel, |
| 850 | ust_marker_inf->ust_marker, |
| 851 | "default"); |
| 852 | if (result < 0) { |
| 853 | WARN("could not enable ust_marker; channel=%s," |
| 854 | " name=%s", |
| 855 | ust_marker_inf->channel, |
| 856 | ust_marker_inf->ust_marker); |
| 857 | |
| 858 | } |
| 859 | break; |
| 860 | case DISABLE_MARKER: |
| 861 | result = ltt_ust_marker_disconnect(ust_marker_inf->channel, |
| 862 | ust_marker_inf->ust_marker, |
| 863 | "default"); |
| 864 | if (result < 0) { |
| 865 | WARN("could not disable ust_marker; channel=%s," |
| 866 | " name=%s", |
| 867 | ust_marker_inf->channel, |
| 868 | ust_marker_inf->ust_marker); |
| 869 | } |
| 870 | break; |
| 871 | } |
| 872 | |
| 873 | reply_header->result = result; |
| 874 | |
| 875 | if (ustcomm_send(sock, reply_header, NULL) < 0) { |
| 876 | ERR("ustcomm_send failed"); |
| 877 | } |
| 878 | |
| 879 | } |
| 880 | static void process_client_cmd(struct ustcomm_header *recv_header, |
| 881 | char *recv_buf, int sock) |
| 882 | { |
| 883 | int result; |
| 884 | struct ustcomm_header _reply_header; |
| 885 | struct ustcomm_header *reply_header = &_reply_header; |
| 886 | char *send_buf = send_buffer; |
| 887 | |
| 888 | memset(reply_header, 0, sizeof(*reply_header)); |
| 889 | memset(send_buf, 0, sizeof(send_buffer)); |
| 890 | |
| 891 | switch(recv_header->command) { |
| 892 | case GET_SUBBUF_NUM_SIZE: |
| 893 | case SET_SUBBUF_NUM: |
| 894 | case SET_SUBBUF_SIZE: |
| 895 | { |
| 896 | struct ustcomm_channel_info *ch_inf; |
| 897 | ch_inf = (struct ustcomm_channel_info *)recv_buf; |
| 898 | result = ustcomm_unpack_channel_info(ch_inf); |
| 899 | if (result < 0) { |
| 900 | ERR("couldn't unpack channel info"); |
| 901 | reply_header->result = -EINVAL; |
| 902 | goto send_response; |
| 903 | } |
| 904 | process_channel_cmd(sock, recv_header->command, ch_inf); |
| 905 | return; |
| 906 | } |
| 907 | case GET_BUF_SHMID_PIPE_FD: |
| 908 | case NOTIFY_BUF_MAPPED: |
| 909 | case GET_SUBBUFFER: |
| 910 | case PUT_SUBBUFFER: |
| 911 | { |
| 912 | struct ustcomm_buffer_info *buf_inf; |
| 913 | buf_inf = (struct ustcomm_buffer_info *)recv_buf; |
| 914 | result = ustcomm_unpack_buffer_info(buf_inf); |
| 915 | if (result < 0) { |
| 916 | ERR("couldn't unpack buffer info"); |
| 917 | reply_header->result = -EINVAL; |
| 918 | goto send_response; |
| 919 | } |
| 920 | process_buffer_cmd(sock, recv_header->command, buf_inf); |
| 921 | return; |
| 922 | } |
| 923 | case ENABLE_MARKER: |
| 924 | case DISABLE_MARKER: |
| 925 | { |
| 926 | struct ustcomm_ust_marker_info *ust_marker_inf; |
| 927 | ust_marker_inf = (struct ustcomm_ust_marker_info *)recv_buf; |
| 928 | result = ustcomm_unpack_ust_marker_info(ust_marker_inf); |
| 929 | if (result < 0) { |
| 930 | ERR("couldn't unpack ust_marker info"); |
| 931 | reply_header->result = -EINVAL; |
| 932 | goto send_response; |
| 933 | } |
| 934 | process_ust_marker_cmd(sock, recv_header->command, ust_marker_inf); |
| 935 | return; |
| 936 | } |
| 937 | case LIST_MARKERS: |
| 938 | { |
| 939 | char *ptr; |
| 940 | size_t size; |
| 941 | FILE *fp; |
| 942 | |
| 943 | fp = open_memstream(&ptr, &size); |
| 944 | if (fp == NULL) { |
| 945 | ERR("opening memstream failed"); |
| 946 | return; |
| 947 | } |
| 948 | print_ust_marker(fp); |
| 949 | fclose(fp); |
| 950 | |
| 951 | reply_header->size = size + 1; /* Include final \0 */ |
| 952 | |
| 953 | result = ustcomm_send(sock, reply_header, ptr); |
| 954 | |
| 955 | free(ptr); |
| 956 | |
| 957 | if (result < 0) { |
| 958 | PERROR("failed to send ust_marker list"); |
| 959 | } |
| 960 | |
| 961 | break; |
| 962 | } |
| 963 | case LIST_TRACE_EVENTS: |
| 964 | { |
| 965 | char *ptr; |
| 966 | size_t size; |
| 967 | FILE *fp; |
| 968 | |
| 969 | fp = open_memstream(&ptr, &size); |
| 970 | if (fp == NULL) { |
| 971 | ERR("opening memstream failed"); |
| 972 | return; |
| 973 | } |
| 974 | print_trace_events(fp); |
| 975 | fclose(fp); |
| 976 | |
| 977 | reply_header->size = size + 1; /* Include final \0 */ |
| 978 | |
| 979 | result = ustcomm_send(sock, reply_header, ptr); |
| 980 | |
| 981 | free(ptr); |
| 982 | |
| 983 | if (result < 0) { |
| 984 | ERR("list_trace_events failed"); |
| 985 | return; |
| 986 | } |
| 987 | |
| 988 | break; |
| 989 | } |
| 990 | case LOAD_PROBE_LIB: |
| 991 | { |
| 992 | char *libfile; |
| 993 | |
| 994 | /* FIXME: No functionality at all... */ |
| 995 | libfile = recv_buf; |
| 996 | |
| 997 | DBG("load_probe_lib loading %s", libfile); |
| 998 | |
| 999 | break; |
| 1000 | } |
| 1001 | case GET_PIDUNIQUE: |
| 1002 | { |
| 1003 | struct ustcomm_pidunique *pid_msg; |
| 1004 | pid_msg = (struct ustcomm_pidunique *)send_buf; |
| 1005 | |
| 1006 | pid_msg->pidunique = pidunique; |
| 1007 | reply_header->size = sizeof(pid_msg); |
| 1008 | |
| 1009 | goto send_response; |
| 1010 | |
| 1011 | } |
| 1012 | case GET_SOCK_PATH: |
| 1013 | { |
| 1014 | struct ustcomm_single_field *sock_msg; |
| 1015 | char *sock_path_env; |
| 1016 | |
| 1017 | sock_msg = (struct ustcomm_single_field *)send_buf; |
| 1018 | |
| 1019 | sock_path_env = getenv("UST_DAEMON_SOCKET"); |
| 1020 | |
| 1021 | if (!sock_path_env) { |
| 1022 | result = ustcomm_pack_single_field(reply_header, |
| 1023 | sock_msg, |
| 1024 | SOCK_DIR "/ustconsumer"); |
| 1025 | |
| 1026 | } else { |
| 1027 | result = ustcomm_pack_single_field(reply_header, |
| 1028 | sock_msg, |
| 1029 | sock_path_env); |
| 1030 | } |
| 1031 | reply_header->result = result; |
| 1032 | |
| 1033 | goto send_response; |
| 1034 | } |
| 1035 | case SET_SOCK_PATH: |
| 1036 | { |
| 1037 | struct ustcomm_single_field *sock_msg; |
| 1038 | sock_msg = (struct ustcomm_single_field *)recv_buf; |
| 1039 | result = ustcomm_unpack_single_field(sock_msg); |
| 1040 | if (result < 0) { |
| 1041 | reply_header->result = -EINVAL; |
| 1042 | goto send_response; |
| 1043 | } |
| 1044 | |
| 1045 | reply_header->result = setenv("UST_DAEMON_SOCKET", |
| 1046 | sock_msg->field, 1); |
| 1047 | |
| 1048 | goto send_response; |
| 1049 | } |
| 1050 | case START: |
| 1051 | case SETUP_TRACE: |
| 1052 | case ALLOC_TRACE: |
| 1053 | case CREATE_TRACE: |
| 1054 | case START_TRACE: |
| 1055 | case STOP_TRACE: |
| 1056 | case DESTROY_TRACE: |
| 1057 | case FORCE_SUBBUF_SWITCH: |
| 1058 | { |
| 1059 | struct ustcomm_single_field *trace_inf = |
| 1060 | (struct ustcomm_single_field *)recv_buf; |
| 1061 | |
| 1062 | result = ustcomm_unpack_single_field(trace_inf); |
| 1063 | if (result < 0) { |
| 1064 | ERR("couldn't unpack trace info"); |
| 1065 | reply_header->result = -EINVAL; |
| 1066 | goto send_response; |
| 1067 | } |
| 1068 | |
| 1069 | reply_header->result = |
| 1070 | process_trace_cmd(recv_header->command, |
| 1071 | trace_inf->field); |
| 1072 | goto send_response; |
| 1073 | |
| 1074 | } |
| 1075 | default: |
| 1076 | reply_header->result = -EINVAL; |
| 1077 | |
| 1078 | goto send_response; |
| 1079 | } |
| 1080 | |
| 1081 | return; |
| 1082 | |
| 1083 | send_response: |
| 1084 | ustcomm_send(sock, reply_header, send_buf); |
| 1085 | } |
| 1086 | |
| 1087 | #define MAX_EVENTS 10 |
| 1088 | |
| 1089 | void *listener_main(void *p) |
| 1090 | { |
| 1091 | struct ustcomm_sock *epoll_sock; |
| 1092 | struct epoll_event events[MAX_EVENTS]; |
| 1093 | struct sockaddr addr; |
| 1094 | int accept_fd, nfds, result, i, addr_size; |
| 1095 | |
| 1096 | DBG("LISTENER"); |
| 1097 | |
| 1098 | pthread_cleanup_push(listener_cleanup, NULL); |
| 1099 | |
| 1100 | for(;;) { |
| 1101 | nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1); |
| 1102 | if (nfds == -1) { |
| 1103 | PERROR("listener_main: epoll_wait failed"); |
| 1104 | continue; |
| 1105 | } |
| 1106 | |
| 1107 | for (i = 0; i < nfds; i++) { |
| 1108 | pthread_mutex_lock(&listener_thread_data_mutex); |
| 1109 | pthread_cleanup_push(release_listener_mutex, NULL); |
| 1110 | epoll_sock = (struct ustcomm_sock *)events[i].data.ptr; |
| 1111 | if (epoll_sock == listen_sock) { |
| 1112 | addr_size = sizeof(struct sockaddr); |
| 1113 | accept_fd = accept(epoll_sock->fd, |
| 1114 | &addr, |
| 1115 | (socklen_t *)&addr_size); |
| 1116 | if (accept_fd == -1) { |
| 1117 | PERROR("listener_main: accept failed"); |
| 1118 | continue; |
| 1119 | } |
| 1120 | ustcomm_init_sock(accept_fd, epoll_fd, |
| 1121 | &ust_socks); |
| 1122 | } else { |
| 1123 | memset(receive_header, 0, |
| 1124 | sizeof(*receive_header)); |
| 1125 | memset(receive_buffer, 0, |
| 1126 | sizeof(receive_buffer)); |
| 1127 | result = ustcomm_recv(epoll_sock->fd, |
| 1128 | receive_header, |
| 1129 | receive_buffer); |
| 1130 | if (result == 0) { |
| 1131 | ustcomm_del_sock(epoll_sock, 0); |
| 1132 | } else { |
| 1133 | process_client_cmd(receive_header, |
| 1134 | receive_buffer, |
| 1135 | epoll_sock->fd); |
| 1136 | } |
| 1137 | } |
| 1138 | pthread_cleanup_pop(1); /* release listener mutex */ |
| 1139 | } |
| 1140 | } |
| 1141 | |
| 1142 | pthread_cleanup_pop(1); |
| 1143 | } |
| 1144 | |
| 1145 | /* These should only be accessed in the parent thread, |
| 1146 | * not the listener. |
| 1147 | */ |
| 1148 | static volatile sig_atomic_t have_listener = 0; |
| 1149 | static pthread_t listener_thread; |
| 1150 | |
| 1151 | void create_listener(void) |
| 1152 | { |
| 1153 | int result; |
| 1154 | sigset_t sig_all_blocked; |
| 1155 | sigset_t orig_parent_mask; |
| 1156 | |
| 1157 | if (have_listener) { |
| 1158 | WARN("not creating listener because we already had one"); |
| 1159 | return; |
| 1160 | } |
| 1161 | |
| 1162 | /* A new thread created by pthread_create inherits the signal mask |
| 1163 | * from the parent. To avoid any signal being received by the |
| 1164 | * listener thread, we block all signals temporarily in the parent, |
| 1165 | * while we create the listener thread. |
| 1166 | */ |
| 1167 | |
| 1168 | sigfillset(&sig_all_blocked); |
| 1169 | |
| 1170 | result = pthread_sigmask(SIG_SETMASK, &sig_all_blocked, &orig_parent_mask); |
| 1171 | if (result) { |
| 1172 | PERROR("pthread_sigmask: %s", strerror(result)); |
| 1173 | } |
| 1174 | |
| 1175 | result = pthread_create(&listener_thread, NULL, listener_main, NULL); |
| 1176 | if (result == -1) { |
| 1177 | PERROR("pthread_create"); |
| 1178 | } |
| 1179 | |
| 1180 | /* Restore original signal mask in parent */ |
| 1181 | result = pthread_sigmask(SIG_SETMASK, &orig_parent_mask, NULL); |
| 1182 | if (result) { |
| 1183 | PERROR("pthread_sigmask: %s", strerror(result)); |
| 1184 | } else { |
| 1185 | have_listener = 1; |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | #define AUTOPROBE_DISABLED 0 |
| 1190 | #define AUTOPROBE_ENABLE_ALL 1 |
| 1191 | #define AUTOPROBE_ENABLE_REGEX 2 |
| 1192 | static int autoprobe_method = AUTOPROBE_DISABLED; |
| 1193 | static regex_t autoprobe_regex; |
| 1194 | |
| 1195 | static void auto_probe_connect(struct ust_marker *m) |
| 1196 | { |
| 1197 | int result; |
| 1198 | |
| 1199 | char* concat_name = NULL; |
| 1200 | const char *probe_name = "default"; |
| 1201 | |
| 1202 | if (autoprobe_method == AUTOPROBE_DISABLED) { |
| 1203 | return; |
| 1204 | } else if (autoprobe_method == AUTOPROBE_ENABLE_REGEX) { |
| 1205 | result = asprintf(&concat_name, "%s/%s", m->channel, m->name); |
| 1206 | if (result == -1) { |
| 1207 | ERR("auto_probe_connect: asprintf failed (ust_marker %s/%s)", |
| 1208 | m->channel, m->name); |
| 1209 | return; |
| 1210 | } |
| 1211 | if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) { |
| 1212 | free(concat_name); |
| 1213 | return; |
| 1214 | } |
| 1215 | free(concat_name); |
| 1216 | } |
| 1217 | |
| 1218 | result = ltt_ust_marker_connect(m->channel, m->name, probe_name); |
| 1219 | if (result && result != -EEXIST) |
| 1220 | ERR("ltt_ust_marker_connect (ust_marker = %s/%s, errno = %d)", m->channel, m->name, -result); |
| 1221 | |
| 1222 | DBG("auto connected ust_marker %s (addr: %p) %s to probe default", m->channel, m, m->name); |
| 1223 | |
| 1224 | } |
| 1225 | |
| 1226 | static struct ustcomm_sock * init_app_socket(int epoll_fd) |
| 1227 | { |
| 1228 | char *dir_name, *sock_name; |
| 1229 | int result; |
| 1230 | struct ustcomm_sock *sock = NULL; |
| 1231 | time_t mtime; |
| 1232 | |
| 1233 | dir_name = ustcomm_user_sock_dir(); |
| 1234 | if (!dir_name) |
| 1235 | return NULL; |
| 1236 | |
| 1237 | mtime = ustcomm_pid_st_mtime(getpid()); |
| 1238 | if (!mtime) { |
| 1239 | goto free_dir_name; |
| 1240 | } |
| 1241 | |
| 1242 | result = asprintf(&sock_name, "%s/%d.%ld", dir_name, |
| 1243 | (int) getpid(), (long) mtime); |
| 1244 | if (result < 0) { |
| 1245 | ERR("string overflow allocating socket name, " |
| 1246 | "UST thread bailing"); |
| 1247 | goto free_dir_name; |
| 1248 | } |
| 1249 | |
| 1250 | result = ensure_dir_exists(dir_name, S_IRWXU); |
| 1251 | if (result == -1) { |
| 1252 | ERR("Unable to create socket directory %s, UST thread bailing", |
| 1253 | dir_name); |
| 1254 | goto free_sock_name; |
| 1255 | } |
| 1256 | |
| 1257 | sock = ustcomm_init_named_socket(sock_name, epoll_fd); |
| 1258 | if (!sock) { |
| 1259 | ERR("Error initializing named socket (%s). Check that directory" |
| 1260 | "exists and that it is writable. UST thread bailing", sock_name); |
| 1261 | goto free_sock_name; |
| 1262 | } |
| 1263 | |
| 1264 | free_sock_name: |
| 1265 | free(sock_name); |
| 1266 | free_dir_name: |
| 1267 | free(dir_name); |
| 1268 | |
| 1269 | return sock; |
| 1270 | } |
| 1271 | |
| 1272 | static void __attribute__((constructor)) init() |
| 1273 | { |
| 1274 | struct timespec ts; |
| 1275 | int result; |
| 1276 | char* autoprobe_val = NULL; |
| 1277 | char* subbuffer_size_val = NULL; |
| 1278 | char* subbuffer_count_val = NULL; |
| 1279 | unsigned int subbuffer_size; |
| 1280 | unsigned int subbuffer_count; |
| 1281 | unsigned int power; |
| 1282 | |
| 1283 | /* Assign the pidunique, to be able to differentiate the processes with same |
| 1284 | * pid, (before and after an exec). |
| 1285 | */ |
| 1286 | pidunique = make_pidunique(); |
| 1287 | processpid = getpid(); |
| 1288 | |
| 1289 | DBG("Tracectl constructor"); |
| 1290 | |
| 1291 | /* Set up epoll */ |
| 1292 | epoll_fd = epoll_create(MAX_EVENTS); |
| 1293 | if (epoll_fd == -1) { |
| 1294 | ERR("epoll_create failed, tracing shutting down"); |
| 1295 | return; |
| 1296 | } |
| 1297 | |
| 1298 | /* Create the socket */ |
| 1299 | listen_sock = init_app_socket(epoll_fd); |
| 1300 | if (!listen_sock) { |
| 1301 | ERR("failed to create application socket," |
| 1302 | " tracing shutting down"); |
| 1303 | return; |
| 1304 | } |
| 1305 | |
| 1306 | create_listener(); |
| 1307 | |
| 1308 | /* Get clock the clock source type */ |
| 1309 | |
| 1310 | /* Default clock source */ |
| 1311 | ust_clock_source = CLOCK_TRACE; |
| 1312 | if (clock_gettime(ust_clock_source, &ts) != 0) { |
| 1313 | ust_clock_source = CLOCK_MONOTONIC; |
| 1314 | DBG("UST traces will not be synchronized with LTTng traces"); |
| 1315 | } |
| 1316 | |
| 1317 | if (getenv("UST_TRACE") || getenv("UST_AUTOPROBE")) { |
| 1318 | /* Ensure ust_marker control is initialized */ |
| 1319 | init_ust_marker_control(); |
| 1320 | } |
| 1321 | |
| 1322 | autoprobe_val = getenv("UST_AUTOPROBE"); |
| 1323 | if (autoprobe_val) { |
| 1324 | struct ust_marker_iter iter; |
| 1325 | |
| 1326 | DBG("Autoprobe enabled."); |
| 1327 | |
| 1328 | /* first, set the callback that will connect the |
| 1329 | * probe on new ust_marker |
| 1330 | */ |
| 1331 | if (autoprobe_val[0] == '/') { |
| 1332 | result = regcomp(&autoprobe_regex, autoprobe_val+1, 0); |
| 1333 | if (result) { |
| 1334 | char regexerr[150]; |
| 1335 | |
| 1336 | regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr)); |
| 1337 | ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr); |
| 1338 | /* don't crash the application just for this */ |
| 1339 | } else { |
| 1340 | autoprobe_method = AUTOPROBE_ENABLE_REGEX; |
| 1341 | } |
| 1342 | } else { |
| 1343 | /* just enable all instrumentation */ |
| 1344 | autoprobe_method = AUTOPROBE_ENABLE_ALL; |
| 1345 | } |
| 1346 | |
| 1347 | ust_marker_set_new_ust_marker_cb(auto_probe_connect); |
| 1348 | |
| 1349 | /* Now, connect the probes that were already registered. */ |
| 1350 | ust_marker_iter_reset(&iter); |
| 1351 | ust_marker_iter_start(&iter); |
| 1352 | |
| 1353 | DBG("now iterating on ust_marker already registered"); |
| 1354 | while (iter.ust_marker) { |
| 1355 | DBG("now iterating on ust_marker %s", (*iter.ust_marker)->name); |
| 1356 | auto_probe_connect(*iter.ust_marker); |
| 1357 | ust_marker_iter_next(&iter); |
| 1358 | } |
| 1359 | ust_marker_iter_stop(&iter); |
| 1360 | } |
| 1361 | |
| 1362 | if (getenv("UST_OVERWRITE")) { |
| 1363 | int val = atoi(getenv("UST_OVERWRITE")); |
| 1364 | if (val == 0 || val == 1) { |
| 1365 | CMM_STORE_SHARED(ust_channels_overwrite_by_default, val); |
| 1366 | } else { |
| 1367 | WARN("invalid value for UST_OVERWRITE"); |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | if (getenv("UST_AUTOCOLLECT")) { |
| 1372 | int val = atoi(getenv("UST_AUTOCOLLECT")); |
| 1373 | if (val == 0 || val == 1) { |
| 1374 | CMM_STORE_SHARED(ust_channels_request_collection_by_default, val); |
| 1375 | } else { |
| 1376 | WARN("invalid value for UST_AUTOCOLLECT"); |
| 1377 | } |
| 1378 | } |
| 1379 | |
| 1380 | subbuffer_size_val = getenv("UST_SUBBUF_SIZE"); |
| 1381 | if (subbuffer_size_val) { |
| 1382 | sscanf(subbuffer_size_val, "%u", &subbuffer_size); |
| 1383 | power = pow2_higher_or_eq(subbuffer_size); |
| 1384 | if (power != subbuffer_size) |
| 1385 | WARN("using the next power of two for buffer size = %u\n", power); |
| 1386 | chan_infos[LTT_CHANNEL_UST].def_subbufsize = power; |
| 1387 | } |
| 1388 | |
| 1389 | subbuffer_count_val = getenv("UST_SUBBUF_NUM"); |
| 1390 | if (subbuffer_count_val) { |
| 1391 | sscanf(subbuffer_count_val, "%u", &subbuffer_count); |
| 1392 | if (subbuffer_count < 2) |
| 1393 | subbuffer_count = 2; |
| 1394 | chan_infos[LTT_CHANNEL_UST].def_subbufcount = subbuffer_count; |
| 1395 | } |
| 1396 | |
| 1397 | if (getenv("UST_TRACE")) { |
| 1398 | char trace_name[] = "auto"; |
| 1399 | char trace_type[] = "ustrelay"; |
| 1400 | |
| 1401 | DBG("starting early tracing"); |
| 1402 | |
| 1403 | /* Ensure buffers are initialized, for the transport to be available. |
| 1404 | * We are about to set a trace type and it will fail without this. |
| 1405 | */ |
| 1406 | init_ustrelay_transport(); |
| 1407 | |
| 1408 | /* FIXME: When starting early tracing (here), depending on the |
| 1409 | * order of constructors, it is very well possible some ust_marker |
| 1410 | * sections are not yet registered. Because of this, some |
| 1411 | * channels may not be registered. Yet, we are about to ask the |
| 1412 | * daemon to collect the channels. Channels which are not yet |
| 1413 | * registered will not be collected. |
| 1414 | * |
| 1415 | * Currently, in LTTng, there is no way to add a channel after |
| 1416 | * trace start. The reason for this is that it induces complex |
| 1417 | * concurrency issues on the trace structures, which can only |
| 1418 | * be resolved using RCU. This has not been done yet. As a |
| 1419 | * workaround, we are forcing the registration of the "ust" |
| 1420 | * channel here. This is the only channel (apart from metadata) |
| 1421 | * that can be reliably used in early tracing. |
| 1422 | * |
| 1423 | * Non-early tracing does not have this problem and can use |
| 1424 | * arbitrary channel names. |
| 1425 | */ |
| 1426 | ltt_channels_register("ust"); |
| 1427 | |
| 1428 | result = ltt_trace_setup(trace_name); |
| 1429 | if (result < 0) { |
| 1430 | ERR("ltt_trace_setup failed"); |
| 1431 | return; |
| 1432 | } |
| 1433 | |
| 1434 | result = ltt_trace_set_type(trace_name, trace_type); |
| 1435 | if (result < 0) { |
| 1436 | ERR("ltt_trace_set_type failed"); |
| 1437 | return; |
| 1438 | } |
| 1439 | |
| 1440 | result = ltt_trace_alloc(trace_name); |
| 1441 | if (result < 0) { |
| 1442 | ERR("ltt_trace_alloc failed"); |
| 1443 | return; |
| 1444 | } |
| 1445 | |
| 1446 | result = ltt_trace_start(trace_name); |
| 1447 | if (result < 0) { |
| 1448 | ERR("ltt_trace_start failed"); |
| 1449 | return; |
| 1450 | } |
| 1451 | |
| 1452 | /* Do this after the trace is started in order to avoid creating confusion |
| 1453 | * if the trace fails to start. */ |
| 1454 | inform_consumer_daemon(trace_name); |
| 1455 | } |
| 1456 | |
| 1457 | return; |
| 1458 | |
| 1459 | /* should decrementally destroy stuff if error */ |
| 1460 | |
| 1461 | } |
| 1462 | |
| 1463 | /* This is only called if we terminate normally, not with an unhandled signal, |
| 1464 | * so we cannot rely on it. However, for now, LTTV requires that the header of |
| 1465 | * the last sub-buffer contain a valid end time for the trace. This is done |
| 1466 | * automatically only when the trace is properly stopped. |
| 1467 | * |
| 1468 | * If the traced program crashed, it is always possible to manually add the |
| 1469 | * right value in the header, or to open the trace in text mode. |
| 1470 | * |
| 1471 | * FIXME: Fix LTTV so it doesn't need this. |
| 1472 | */ |
| 1473 | |
| 1474 | static void destroy_traces(void) |
| 1475 | { |
| 1476 | int result; |
| 1477 | |
| 1478 | /* if trace running, finish it */ |
| 1479 | |
| 1480 | DBG("destructor stopping traces"); |
| 1481 | |
| 1482 | result = ltt_trace_stop("auto"); |
| 1483 | if (result == -1) { |
| 1484 | ERR("ltt_trace_stop error"); |
| 1485 | } |
| 1486 | |
| 1487 | result = ltt_trace_destroy("auto", 0); |
| 1488 | if (result == -1) { |
| 1489 | ERR("ltt_trace_destroy error"); |
| 1490 | } |
| 1491 | } |
| 1492 | |
| 1493 | static int trace_recording(void) |
| 1494 | { |
| 1495 | int retval = 0; |
| 1496 | struct ust_trace *trace; |
| 1497 | |
| 1498 | ltt_lock_traces(); |
| 1499 | |
| 1500 | cds_list_for_each_entry(trace, <t_traces.head, list) { |
| 1501 | if (trace->active) { |
| 1502 | retval = 1; |
| 1503 | break; |
| 1504 | } |
| 1505 | } |
| 1506 | |
| 1507 | ltt_unlock_traces(); |
| 1508 | |
| 1509 | return retval; |
| 1510 | } |
| 1511 | |
| 1512 | int restarting_usleep(useconds_t usecs) |
| 1513 | { |
| 1514 | struct timespec tv; |
| 1515 | int result; |
| 1516 | |
| 1517 | tv.tv_sec = 0; |
| 1518 | tv.tv_nsec = usecs * 1000; |
| 1519 | |
| 1520 | do { |
| 1521 | result = nanosleep(&tv, &tv); |
| 1522 | } while (result == -1 && errno == EINTR); |
| 1523 | |
| 1524 | return result; |
| 1525 | } |
| 1526 | |
| 1527 | static void stop_listener(void) |
| 1528 | { |
| 1529 | int result; |
| 1530 | |
| 1531 | if (!have_listener) |
| 1532 | return; |
| 1533 | |
| 1534 | result = pthread_cancel(listener_thread); |
| 1535 | if (result != 0) { |
| 1536 | ERR("pthread_cancel: %s", strerror(result)); |
| 1537 | } |
| 1538 | result = pthread_join(listener_thread, NULL); |
| 1539 | if (result != 0) { |
| 1540 | ERR("pthread_join: %s", strerror(result)); |
| 1541 | } |
| 1542 | } |
| 1543 | |
| 1544 | /* This destructor keeps the process alive for a few seconds in order |
| 1545 | * to leave time for ustconsumer to connect to its buffers. This is necessary |
| 1546 | * for programs whose execution is very short. It is also useful in all |
| 1547 | * programs when tracing is started close to the end of the program |
| 1548 | * execution. |
| 1549 | * |
| 1550 | * FIXME: For now, this only works for the first trace created in a |
| 1551 | * process. |
| 1552 | */ |
| 1553 | |
| 1554 | static void __attribute__((destructor)) keepalive() |
| 1555 | { |
| 1556 | if (processpid != getpid()) { |
| 1557 | return; |
| 1558 | } |
| 1559 | |
| 1560 | if (trace_recording() && CMM_LOAD_SHARED(buffers_to_export)) { |
| 1561 | int total = 0; |
| 1562 | DBG("Keeping process alive for consumer daemon..."); |
| 1563 | while (CMM_LOAD_SHARED(buffers_to_export)) { |
| 1564 | const int interv = 200000; |
| 1565 | restarting_usleep(interv); |
| 1566 | total += interv; |
| 1567 | |
| 1568 | if (total >= 3000000) { |
| 1569 | WARN("non-consumed buffers remaining after wait limit; not waiting anymore"); |
| 1570 | break; |
| 1571 | } |
| 1572 | } |
| 1573 | DBG("Finally dying..."); |
| 1574 | } |
| 1575 | |
| 1576 | destroy_traces(); |
| 1577 | |
| 1578 | /* Ask the listener to stop and clean up. */ |
| 1579 | stop_listener(); |
| 1580 | } |
| 1581 | |
| 1582 | void ust_potential_exec(void) |
| 1583 | { |
| 1584 | ust_marker(potential_exec, UST_MARKER_NOARGS); |
| 1585 | |
| 1586 | DBG("test"); |
| 1587 | |
| 1588 | keepalive(); |
| 1589 | } |
| 1590 | |
| 1591 | /* Notify ust that there was a fork. This needs to be called inside |
| 1592 | * the new process, anytime a process whose memory is not shared with |
| 1593 | * the parent is created. If this function is not called, the events |
| 1594 | * of the new process will not be collected. |
| 1595 | * |
| 1596 | * Signals should be disabled before the fork and reenabled only after |
| 1597 | * this call in order to guarantee tracing is not started before ust_fork() |
| 1598 | * sanitizes the new process. |
| 1599 | */ |
| 1600 | |
| 1601 | static void ust_fork(void) |
| 1602 | { |
| 1603 | struct ustcomm_sock *sock, *sock_tmp; |
| 1604 | struct ust_trace *trace, *trace_tmp; |
| 1605 | int result; |
| 1606 | |
| 1607 | /* FIXME: technically, the locks could have been taken before the fork */ |
| 1608 | DBG("ust: forking"); |
| 1609 | |
| 1610 | /* Get the pid of the new process */ |
| 1611 | processpid = getpid(); |
| 1612 | |
| 1613 | /* |
| 1614 | * FIXME: This could be prettier, we loop over the list twice and |
| 1615 | * following good locking practice should lock around the loop |
| 1616 | */ |
| 1617 | cds_list_for_each_entry_safe(trace, trace_tmp, <t_traces.head, list) { |
| 1618 | ltt_trace_stop(trace->trace_name); |
| 1619 | } |
| 1620 | |
| 1621 | /* Delete all active connections, but leave them in the epoll set */ |
| 1622 | cds_list_for_each_entry_safe(sock, sock_tmp, &ust_socks, list) { |
| 1623 | ustcomm_del_sock(sock, 1); |
| 1624 | } |
| 1625 | |
| 1626 | /* |
| 1627 | * FIXME: This could be prettier, we loop over the list twice and |
| 1628 | * following good locking practice should lock around the loop |
| 1629 | */ |
| 1630 | cds_list_for_each_entry_safe(trace, trace_tmp, <t_traces.head, list) { |
| 1631 | ltt_trace_destroy(trace->trace_name, 1); |
| 1632 | } |
| 1633 | |
| 1634 | /* Clean up the listener socket and epoll, keeping the socket file */ |
| 1635 | if (listen_sock) { |
| 1636 | ustcomm_del_named_sock(listen_sock, 1); |
| 1637 | listen_sock = NULL; |
| 1638 | } |
| 1639 | close(epoll_fd); |
| 1640 | |
| 1641 | /* Re-start the launch sequence */ |
| 1642 | CMM_STORE_SHARED(buffers_to_export, 0); |
| 1643 | have_listener = 0; |
| 1644 | |
| 1645 | /* Set up epoll */ |
| 1646 | epoll_fd = epoll_create(MAX_EVENTS); |
| 1647 | if (epoll_fd == -1) { |
| 1648 | ERR("epoll_create failed, tracing shutting down"); |
| 1649 | return; |
| 1650 | } |
| 1651 | |
| 1652 | /* Create the socket */ |
| 1653 | listen_sock = init_app_socket(epoll_fd); |
| 1654 | if (!listen_sock) { |
| 1655 | ERR("failed to create application socket," |
| 1656 | " tracing shutting down"); |
| 1657 | return; |
| 1658 | } |
| 1659 | create_listener(); |
| 1660 | ltt_trace_setup("auto"); |
| 1661 | result = ltt_trace_set_type("auto", "ustrelay"); |
| 1662 | if (result < 0) { |
| 1663 | ERR("ltt_trace_set_type failed"); |
| 1664 | return; |
| 1665 | } |
| 1666 | |
| 1667 | ltt_trace_alloc("auto"); |
| 1668 | ltt_trace_start("auto"); |
| 1669 | inform_consumer_daemon("auto"); |
| 1670 | } |
| 1671 | |
| 1672 | void ust_before_fork(ust_fork_info_t *fork_info) |
| 1673 | { |
| 1674 | /* Disable signals. This is to avoid that the child |
| 1675 | * intervenes before it is properly setup for tracing. It is |
| 1676 | * safer to disable all signals, because then we know we are not |
| 1677 | * breaking anything by restoring the original mask. |
| 1678 | */ |
| 1679 | sigset_t all_sigs; |
| 1680 | int result; |
| 1681 | |
| 1682 | /* FIXME: |
| 1683 | - only do this if tracing is active |
| 1684 | */ |
| 1685 | |
| 1686 | /* Disable signals */ |
| 1687 | sigfillset(&all_sigs); |
| 1688 | result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs); |
| 1689 | if (result == -1) { |
| 1690 | PERROR("sigprocmask"); |
| 1691 | return; |
| 1692 | } |
| 1693 | |
| 1694 | /* |
| 1695 | * Take the fork lock to make sure we are not in the middle of |
| 1696 | * something in the listener thread. |
| 1697 | */ |
| 1698 | pthread_mutex_lock(&listener_thread_data_mutex); |
| 1699 | /* |
| 1700 | * Hold listen_sock_mutex to protect from listen_sock teardown. |
| 1701 | */ |
| 1702 | pthread_mutex_lock(&listen_sock_mutex); |
| 1703 | rcu_bp_before_fork(); |
| 1704 | } |
| 1705 | |
| 1706 | /* Don't call this function directly in a traced program */ |
| 1707 | static void ust_after_fork_common(ust_fork_info_t *fork_info) |
| 1708 | { |
| 1709 | int result; |
| 1710 | |
| 1711 | pthread_mutex_unlock(&listen_sock_mutex); |
| 1712 | pthread_mutex_unlock(&listener_thread_data_mutex); |
| 1713 | |
| 1714 | /* Restore signals */ |
| 1715 | result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL); |
| 1716 | if (result == -1) { |
| 1717 | PERROR("sigprocmask"); |
| 1718 | return; |
| 1719 | } |
| 1720 | } |
| 1721 | |
| 1722 | void ust_after_fork_parent(ust_fork_info_t *fork_info) |
| 1723 | { |
| 1724 | rcu_bp_after_fork_parent(); |
| 1725 | /* Release mutexes and reenable signals */ |
| 1726 | ust_after_fork_common(fork_info); |
| 1727 | } |
| 1728 | |
| 1729 | void ust_after_fork_child(ust_fork_info_t *fork_info) |
| 1730 | { |
| 1731 | /* Release urcu mutexes */ |
| 1732 | rcu_bp_after_fork_child(); |
| 1733 | |
| 1734 | /* Sanitize the child */ |
| 1735 | ust_fork(); |
| 1736 | |
| 1737 | /* Then release mutexes and reenable signals */ |
| 1738 | ust_after_fork_common(fork_info); |
| 1739 | } |
| 1740 | |