libtracectl/tracectl.c

   1 #include <stdio.h>
   2 #include <stdint.h>
   3 #include <signal.h>
   4 #include <sys/types.h>
   5 #include <sys/socket.h>
   6 #include <sys/un.h>
   7 #include <sched.h>
   8 #include <fcntl.h>
   9 #include <poll.h>
  10
  11 #include "marker.h"
  12 #include "tracer.h"
  13 #include "localerr.h"
  14 #include "ustcomm.h"
  15 #include "relay.h" /* FIXME: remove */
  16
  17 //#define USE_CLONE
  18
  19 #define USTSIGNAL SIGIO
  20
  21 #define MAX_MSG_SIZE (100)
  22 #define MSG_NOTIF 1
  23 #define MSG_REGISTER_NOTIF 2
  24
  25 char consumer_stack[10000];
  26
  27 struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers);
  28
  29 static struct ustcomm_app ustcomm_app;
  30
  31 struct tracecmd { /* no padding */
  32         uint32_t size;
  33         uint16_t command;
  34 };
  35
  36 //struct listener_arg {
  37 //      int pipe_fd;
  38 //};
  39
  40 struct trctl_msg {
  41         /* size: the size of all the fields except size itself */
  42         uint32_t size;
  43         uint16_t type;
  44         /* Only the necessary part of the payload is transferred. It
  45          * may even be none of it.
  46          */
  47         char payload[94];
  48 };
  49
  50 struct consumer_channel {
  51         int fd;
  52         struct ltt_channel_struct *chan;
  53 };
  54
  55 struct blocked_consumer {
  56         int fd_consumer;
  57         int fd_producer;
  58         int tmp_poll_idx;
  59
  60         /* args to ustcomm_send_reply */
  61         struct ustcomm_server server;
  62         struct ustcomm_source src;
  63
  64         /* args to ltt_do_get_subbuf */
  65         struct rchan_buf *rbuf;
  66         struct ltt_channel_buf_struct *lttbuf;
  67
  68         struct list_head list;
  69 };
  70
  71 static void print_markers(void)
  72 {
  73         struct marker_iter iter;
  74
  75         lock_markers();
  76         marker_iter_reset(&iter);
  77         marker_iter_start(&iter);
  78
  79         while(iter.marker) {
  80                 fprintf(stderr, "marker: %s_%s \"%s\"\n", iter.marker->channel, iter.marker->name, iter.marker->format);
  81                 marker_iter_next(&iter);
  82         }
  83         unlock_markers();
  84 }
  85
  86 void do_command(struct tracecmd *cmd)
  87 {
  88 }
  89
  90 void receive_commands()
  91 {
  92 }
  93
  94 int fd_notif = -1;
  95 void notif_cb(void)
  96 {
  97         int result;
  98         struct trctl_msg msg;
  99
 100         /* FIXME: fd_notif should probably be protected by a spinlock */
 101
 102         if(fd_notif == -1)
 103                 return;
 104
 105         msg.type = MSG_NOTIF;
 106         msg.size = sizeof(msg.type);
 107
 108         /* FIXME: don't block here */
 109         result = write(fd_notif, &msg, msg.size+sizeof(msg.size));
 110         if(result == -1) {
 111                 PERROR("write");
 112                 return;
 113         }
 114 }
 115
 116 static int inform_consumer_daemon(void)
 117 {
 118         ustcomm_request_consumer(getpid(), "metadata");
 119         ustcomm_request_consumer(getpid(), "ust");
 120 }
 121
 122 void process_blocked_consumers(void)
 123 {
 124         int n_fds = 0;
 125         struct pollfd *fds;
 126         struct blocked_consumer *bc;
 127         int idx = 0;
 128         char inbuf;
 129         int result;
 130
 131         list_for_each_entry(bc, &blocked_consumers, list) {
 132                 n_fds++;
 133         }
 134
 135         fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd));
 136         if(fds == NULL) {
 137                 ERR("malloc returned NULL");
 138                 return;
 139         }
 140
 141         list_for_each_entry(bc, &blocked_consumers, list) {
 142                 fds[idx].fd = bc->fd_producer;
 143                 fds[idx].events = POLLIN;
 144                 bc->tmp_poll_idx = idx;
 145                 idx++;
 146         }
 147
 148         result = poll(fds, n_fds, 0);
 149         if(result == -1) {
 150                 PERROR("poll");
 151                 return -1;
 152         }
 153
 154         list_for_each_entry(bc, &blocked_consumers, list) {
 155                 if(fds[bc->tmp_poll_idx].revents) {
 156                         long consumed_old = 0;
 157                         char *reply;
 158
 159                         result = read(bc->fd_producer, &inbuf, 1);
 160                         if(result == -1) {
 161                                 PERROR("read");
 162                                 continue;
 163                         }
 164                         if(result == 0) {
 165                                 DBG("PRODUCER END");
 166
 167                                 close(bc->fd_producer);
 168
 169                                 __list_del(bc->list.prev, bc->list.next);
 170
 171                                 result = ustcomm_send_reply(&bc->server, "END", &bc->src);
 172                                 if(result < 0) {
 173                                         ERR("ustcomm_send_reply failed");
 174                                         continue;
 175                                 }
 176
 177                                 continue;
 178                         }
 179
 180                         result = ltt_do_get_subbuf(bc->rbuf, bc->lttbuf, &consumed_old);
 181                         if(result == -EAGAIN) {
 182                                 WARN("missed buffer?");
 183                                 continue;
 184                         }
 185                         else if(result < 0) {
 186                                 DBG("ltt_do_get_subbuf: error: %s", strerror(-result));
 187                         }
 188                         asprintf(&reply, "%s %ld", "OK", consumed_old);
 189                         result = ustcomm_send_reply(&bc->server, reply, &bc->src);
 190                         if(result < 0) {
 191                                 ERR("ustcomm_send_reply failed");
 192                                 free(reply);
 193                                 continue;
 194                         }
 195                         free(reply);
 196
 197                         __list_del(bc->list.prev, bc->list.next);
 198                 }
 199         }
 200
 201 }
 202
 203 int listener_main(void *p)
 204 {
 205         int result;
 206
 207         DBG("LISTENER");
 208
 209         for(;;) {
 210                 uint32_t size;
 211                 struct sockaddr_un addr;
 212                 socklen_t addrlen = sizeof(addr);
 213                 char trace_name[] = "auto";
 214                 char trace_type[] = "ustrelay";
 215                 char *recvbuf;
 216                 int len;
 217                 struct ustcomm_source src;
 218
 219                 process_blocked_consumers();
 220
 221                 result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5);
 222                 if(result < 0) {
 223                         WARN("error in ustcomm_app_recv_message");
 224                         continue;
 225                 }
 226                 else if(result == 0) {
 227                         /* no message */
 228                         continue;
 229                 }
 230
 231                 DBG("received a message! it's: %s\n", recvbuf);
 232                 len = strlen(recvbuf);
 233
 234                 if(!strcmp(recvbuf, "print_markers")) {
 235                         print_markers();
 236                 }
 237                 else if(!strcmp(recvbuf, "trace_setup")) {
 238                         DBG("trace setup");
 239
 240                         result = ltt_trace_setup(trace_name);
 241                         if(result < 0) {
 242                                 ERR("ltt_trace_setup failed");
 243                                 return;
 244                         }
 245
 246                         result = ltt_trace_set_type(trace_name, trace_type);
 247                         if(result < 0) {
 248                                 ERR("ltt_trace_set_type failed");
 249                                 return;
 250                         }
 251                 }
 252                 else if(!strcmp(recvbuf, "trace_alloc")) {
 253                         DBG("trace alloc");
 254
 255                         result = ltt_trace_alloc(trace_name);
 256                         if(result < 0) {
 257                                 ERR("ltt_trace_alloc failed");
 258                                 return;
 259                         }
 260                 }
 261                 else if(!strcmp(recvbuf, "trace_start")) {
 262                         DBG("trace start");
 263
 264                         result = ltt_trace_start(trace_name);
 265                         if(result < 0) {
 266                                 ERR("ltt_trace_start failed");
 267                                 continue;
 268                         }
 269                 }
 270                 else if(!strcmp(recvbuf, "trace_stop")) {
 271                         DBG("trace stop");
 272
 273                         result = ltt_trace_stop(trace_name);
 274                         if(result < 0) {
 275                                 ERR("ltt_trace_stop failed");
 276                                 return;
 277                         }
 278                 }
 279                 else if(!strcmp(recvbuf, "trace_destroy")) {
 280
 281                         DBG("trace destroy");
 282
 283                         result = ltt_trace_destroy(trace_name);
 284                         if(result < 0) {
 285                                 ERR("ltt_trace_destroy failed");
 286                                 return;
 287                         }
 288                 }
 289                 else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) {
 290                         struct ltt_trace_struct *trace;
 291                         char trace_name[] = "auto";
 292                         int i;
 293                         char *channel_name;
 294
 295                         DBG("get_shmid");
 296
 297                         channel_name = nth_token(recvbuf, 1);
 298                         if(channel_name == NULL) {
 299                                 ERR("get_shmid: cannot parse channel");
 300                                 goto next_cmd;
 301                         }
 302
 303                         ltt_lock_traces();
 304                         trace = _ltt_trace_find(trace_name);
 305                         ltt_unlock_traces();
 306
 307                         if(trace == NULL) {
 308                                 CPRINTF("cannot find trace!");
 309                                 return 1;
 310                         }
 311
 312                         for(i=0; i<trace->nr_channels; i++) {
 313                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 314                                 struct rchan_buf *rbuf = rchan->buf;
 315
 316                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 317                                         char *reply;
 318
 319                                         DBG("the shmid for the requested channel is %d", rbuf->shmid);
 320                                         asprintf(&reply, "%d", rbuf->shmid);
 321
 322                                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
 323                                         if(result) {
 324                                                 ERR("listener: get_shmid: ustcomm_send_reply failed");
 325                                                 goto next_cmd;
 326                                         }
 327
 328                                         free(reply);
 329
 330                                         break;
 331                                 }
 332                         }
 333                 }
 334                 else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) {
 335                         struct ltt_trace_struct *trace;
 336                         char trace_name[] = "auto";
 337                         int i;
 338                         char *channel_name;
 339
 340                         DBG("get_n_subbufs");
 341
 342                         channel_name = nth_token(recvbuf, 1);
 343                         if(channel_name == NULL) {
 344                                 ERR("get_n_subbufs: cannot parse channel");
 345                                 goto next_cmd;
 346                         }
 347
 348                         ltt_lock_traces();
 349                         trace = _ltt_trace_find(trace_name);
 350                         ltt_unlock_traces();
 351
 352                         if(trace == NULL) {
 353                                 CPRINTF("cannot find trace!");
 354                                 return 1;
 355                         }
 356
 357                         for(i=0; i<trace->nr_channels; i++) {
 358                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 359
 360                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 361                                         char *reply;
 362
 363                                         DBG("the n_subbufs for the requested channel is %d", rchan->n_subbufs);
 364                                         asprintf(&reply, "%d", rchan->n_subbufs);
 365
 366                                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
 367                                         if(result) {
 368                                                 ERR("listener: get_n_subbufs: ustcomm_send_reply failed");
 369                                                 goto next_cmd;
 370                                         }
 371
 372                                         free(reply);
 373
 374                                         break;
 375                                 }
 376                         }
 377                 }
 378                 else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) {
 379                         struct ltt_trace_struct *trace;
 380                         char trace_name[] = "auto";
 381                         int i;
 382                         char *channel_name;
 383
 384                         DBG("get_subbuf_size");
 385
 386                         channel_name = nth_token(recvbuf, 1);
 387                         if(channel_name == NULL) {
 388                                 ERR("get_subbuf_size: cannot parse channel");
 389                                 goto next_cmd;
 390                         }
 391
 392                         ltt_lock_traces();
 393                         trace = _ltt_trace_find(trace_name);
 394                         ltt_unlock_traces();
 395
 396                         if(trace == NULL) {
 397                                 CPRINTF("cannot find trace!");
 398                                 return 1;
 399                         }
 400
 401                         for(i=0; i<trace->nr_channels; i++) {
 402                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 403
 404                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 405                                         char *reply;
 406
 407                                         DBG("the subbuf_size for the requested channel is %d", rchan->subbuf_size);
 408                                         asprintf(&reply, "%d", rchan->subbuf_size);
 409
 410                                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
 411                                         if(result) {
 412                                                 ERR("listener: get_subbuf_size: ustcomm_send_reply failed");
 413                                                 goto next_cmd;
 414                                         }
 415
 416                                         free(reply);
 417
 418                                         break;
 419                                 }
 420                         }
 421                 }
 422                 else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) {
 423                         char *libfile;
 424
 425                         libfile = nth_token(recvbuf, 1);
 426
 427                         DBG("load_probe_lib loading %s", libfile);
 428                 }
 429                 else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) {
 430                         struct ltt_trace_struct *trace;
 431                         char trace_name[] = "auto";
 432                         int i;
 433                         char *channel_name;
 434
 435                         DBG("get_subbuf");
 436
 437                         channel_name = nth_token(recvbuf, 1);
 438                         if(channel_name == NULL) {
 439                                 ERR("get_subbuf: cannot parse channel");
 440                                 goto next_cmd;
 441                         }
 442
 443                         ltt_lock_traces();
 444                         trace = _ltt_trace_find(trace_name);
 445                         ltt_unlock_traces();
 446
 447                         if(trace == NULL) {
 448                                 CPRINTF("cannot find trace!");
 449                                 return 1;
 450                         }
 451
 452                         for(i=0; i<trace->nr_channels; i++) {
 453                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 454
 455                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 456                                         struct rchan_buf *rbuf = rchan->buf;
 457                                         struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
 458                                         char *reply;
 459                                         long consumed_old=0;
 460                                         int fd;
 461                                         struct blocked_consumer *bc;
 462
 463                                         bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer));
 464                                         if(bc == NULL) {
 465                                                 ERR("malloc returned NULL");
 466                                                 goto next_cmd;
 467                                         }
 468                                         bc->fd_consumer = src.fd;
 469                                         bc->fd_producer = lttbuf->data_ready_fd_read;
 470                                         bc->rbuf = rbuf;
 471                                         bc->lttbuf = lttbuf;
 472                                         bc->src = src;
 473                                         bc->server = ustcomm_app.server;
 474
 475                                         list_add(&bc->list, &blocked_consumers);
 476
 477                                         break;
 478                                 }
 479                         }
 480                 }
 481                 else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) {
 482                         struct ltt_trace_struct *trace;
 483                         char trace_name[] = "auto";
 484                         int i;
 485                         char *channel_name;
 486                         long consumed_old;
 487                         char *consumed_old_str;
 488                         char *endptr;
 489
 490                         DBG("put_subbuf");
 491
 492                         channel_name = strdup_malloc(nth_token(recvbuf, 1));
 493                         if(channel_name == NULL) {
 494                                 ERR("put_subbuf_size: cannot parse channel");
 495                                 goto next_cmd;
 496                         }
 497
 498                         consumed_old_str = strdup_malloc(nth_token(recvbuf, 2));
 499                         if(consumed_old_str == NULL) {
 500                                 ERR("put_subbuf: cannot parse consumed_old");
 501                                 goto next_cmd;
 502                         }
 503                         consumed_old = strtol(consumed_old_str, &endptr, 10);
 504                         if(*endptr != '\0') {
 505                                 ERR("put_subbuf: invalid value for consumed_old");
 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                                 CPRINTF("cannot find trace!");
 515                                 return 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                                         struct rchan_buf *rbuf = rchan->buf;
 523                                         struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
 524                                         char *reply;
 525                                         long consumed_old=0;
 526
 527                                         result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old);
 528                                         if(result < 0) {
 529                                                 WARN("ltt_do_put_subbuf: error");
 530                                         }
 531                                         else {
 532                                                 DBG("ltt_do_put_subbuf: success");
 533                                         }
 534                                         asprintf(&reply, "%s", "OK", consumed_old);
 535
 536                                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
 537                                         if(result) {
 538                                                 ERR("listener: put_subbuf: ustcomm_send_reply failed");
 539                                                 goto next_cmd;
 540                                         }
 541
 542                                         free(reply);
 543
 544                                         break;
 545                                 }
 546                         }
 547
 548                         free(channel_name);
 549                         free(consumed_old_str);
 550                 }
 551 //              else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) {
 552 //                      struct ltt_trace_struct *trace;
 553 //                      char trace_name[] = "auto";
 554 //                      int i;
 555 //                      char *channel_name;
 556 //
 557 //                      DBG("get_notifications");
 558 //
 559 //                      channel_name = strdup_malloc(nth_token(recvbuf, 1));
 560 //                      if(channel_name == NULL) {
 561 //                              ERR("put_subbuf_size: cannot parse channel");
 562 //                              goto next_cmd;
 563 //                      }
 564 //
 565 //                      ltt_lock_traces();
 566 //                      trace = _ltt_trace_find(trace_name);
 567 //                      ltt_unlock_traces();
 568 //
 569 //                      if(trace == NULL) {
 570 //                              CPRINTF("cannot find trace!");
 571 //                              return 1;
 572 //                      }
 573 //
 574 //                      for(i=0; i<trace->nr_channels; i++) {
 575 //                              struct rchan *rchan = trace->channels[i].trans_channel_data;
 576 //                              int fd;
 577 //
 578 //                              if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 579 //                                      struct rchan_buf *rbuf = rchan->buf;
 580 //                                      struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
 581 //
 582 //                                      result = fd = ustcomm_app_detach_client(&ustcomm_app, &src);
 583 //                                      if(result == -1) {
 584 //                                              ERR("ustcomm_app_detach_client failed");
 585 //                                              goto next_cmd;
 586 //                                      }
 587 //
 588 //                                      lttbuf->wake_consumer_arg = (void *) fd;
 589 //
 590 //                                      smp_wmb();
 591 //
 592 //                                      lttbuf->call_wake_consumer = 1;
 593 //
 594 //                                      break;
 595 //                              }
 596 //                      }
 597 //
 598 //                      free(channel_name);
 599 //              }
 600                 else {
 601                         ERR("unable to parse message: %s", recvbuf);
 602                 }
 603
 604         next_cmd:
 605                 free(recvbuf);
 606         }
 607 }
 608
 609 static char listener_stack[16384];
 610
 611 void create_listener(void)
 612 {
 613         int result;
 614         static char listener_stack[16384];
 615         //char *listener_stack = malloc(16384);
 616
 617 #ifdef USE_CLONE
 618         result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
 619         if(result == -1) {
 620                 perror("clone");
 621         }
 622 #else
 623         pthread_t thread;
 624
 625         pthread_create(&thread, NULL, listener_main, NULL);
 626 #endif
 627 }
 628
 629 /* The signal handler itself. Signals must be setup so there cannot be
 630    nested signals. */
 631
 632 void sighandler(int sig)
 633 {
 634         static char have_listener = 0;
 635         DBG("sighandler");
 636
 637         if(!have_listener) {
 638                 create_listener();
 639                 have_listener = 1;
 640         }
 641 }
 642
 643 /* Called by the app signal handler to chain it to us. */
 644
 645 void chain_signal(void)
 646 {
 647         sighandler(USTSIGNAL);
 648 }
 649
 650 static int init_socket(void)
 651 {
 652         return ustcomm_init_app(getpid(), &ustcomm_app);
 653 }
 654
 655 static void destroy_socket(void)
 656 {
 657 //      int result;
 658 //
 659 //      if(mysocketfile[0] == '\0')
 660 //              return;
 661 //
 662 //      result = unlink(mysocketfile);
 663 //      if(result == -1) {
 664 //              PERROR("unlink");
 665 //      }
 666 }
 667
 668 static int init_signal_handler(void)
 669 {
 670         /* Attempt to handler SIGIO. If the main program wants to
 671          * handle it, fine, it'll override us. They it'll have to
 672          * use the chaining function.
 673          */
 674
 675         int result;
 676         struct sigaction act;
 677
 678         result = sigemptyset(&act.sa_mask);
 679         if(result == -1) {
 680                 PERROR("sigemptyset");
 681                 return -1;
 682         }
 683
 684         act.sa_handler = sighandler;
 685         act.sa_flags = SA_RESTART;
 686
 687         /* Only defer ourselves. Also, try to restart interrupted
 688          * syscalls to disturb the traced program as little as possible.
 689          */
 690         result = sigaction(SIGIO, &act, NULL);
 691         if(result == -1) {
 692                 PERROR("sigaction");
 693                 return -1;
 694         }
 695
 696         return 0;
 697 }
 698
 699 static void auto_probe_connect(struct marker *m)
 700 {
 701         int result;
 702
 703         result = ltt_marker_connect(m->channel, m->name, "default");
 704         if(result)
 705                 ERR("ltt_marker_connect");
 706
 707         DBG("just auto connected marker %s %s to probe default", m->channel, m->name);
 708 }
 709
 710 static void __attribute__((constructor(101))) init0()
 711 {
 712         DBG("UST_AUTOPROBE constructor");
 713         if(getenv("UST_AUTOPROBE")) {
 714                 marker_set_new_marker_cb(auto_probe_connect);
 715         }
 716 }
 717
 718 static void fini(void);
 719
 720 static void __attribute__((constructor(1000))) init()
 721 {
 722         int result;
 723
 724         DBG("UST_TRACE constructor");
 725
 726         /* Must create socket before signal handler to prevent races.
 727          */
 728         result = init_socket();
 729         if(result == -1) {
 730                 ERR("init_socket error");
 731                 return;
 732         }
 733         result = init_signal_handler();
 734         if(result == -1) {
 735                 ERR("init_signal_handler error");
 736                 return;
 737         }
 738
 739         if(getenv("UST_TRACE")) {
 740                 char trace_name[] = "auto";
 741                 char trace_type[] = "ustrelay";
 742
 743                 DBG("starting early tracing");
 744
 745                 /* Ensure marker control is initialized */
 746                 init_marker_control();
 747
 748                 /* Ensure relay is initialized */
 749                 init_ustrelay_transport();
 750
 751                 /* Ensure markers are initialized */
 752                 init_markers();
 753
 754                 /* In case. */
 755                 ltt_channels_register("ust");
 756
 757                 result = ltt_trace_setup(trace_name);
 758                 if(result < 0) {
 759                         ERR("ltt_trace_setup failed");
 760                         return;
 761                 }
 762
 763                 result = ltt_trace_set_type(trace_name, trace_type);
 764                 if(result < 0) {
 765                         ERR("ltt_trace_set_type failed");
 766                         return;
 767                 }
 768
 769                 result = ltt_trace_alloc(trace_name);
 770                 if(result < 0) {
 771                         ERR("ltt_trace_alloc failed");
 772                         return;
 773                 }
 774
 775                 result = ltt_trace_start(trace_name);
 776                 if(result < 0) {
 777                         ERR("ltt_trace_start failed");
 778                         return;
 779                 }
 780                 //start_consumer();
 781                 inform_consumer_daemon();
 782         }
 783
 784
 785         return;
 786
 787         /* should decrementally destroy stuff if error */
 788
 789 }
 790
 791 /* This is only called if we terminate normally, not with an unhandled signal,
 792  * so we cannot rely on it. */
 793
 794 static void __attribute__((destructor)) fini()
 795 {
 796         int result;
 797
 798         /* if trace running, finish it */
 799
 800         DBG("destructor stopping traces");
 801
 802         result = ltt_trace_stop("auto");
 803         if(result == -1) {
 804                 ERR("ltt_trace_stop error");
 805         }
 806
 807         result = ltt_trace_destroy("auto");
 808         if(result == -1) {
 809                 ERR("ltt_trace_destroy error");
 810         }
 811
 812         /* FIXME: wait for the consumer to be done */
 813         //DBG("waiting 5 sec for consume");
 814         //sleep(5);
 815
 816         destroy_socket();
 817 }