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 int consumer(void *arg)
  72 {
  73         int result;
  74         int fd;
  75         char str[] = "Hello, this is the consumer.\n";
  76         struct ltt_trace_struct *trace;
  77         struct consumer_channel *consumer_channels;
  78         int i;
  79         char trace_name[] = "auto";
  80
  81         ltt_lock_traces();
  82         trace = _ltt_trace_find(trace_name);
  83         ltt_unlock_traces();
  84
  85         if(trace == NULL) {
  86                 CPRINTF("cannot find trace!");
  87                 return 1;
  88         }
  89
  90         consumer_channels = (struct consumer_channel *) malloc(trace->nr_channels * sizeof(struct consumer_channel));
  91         if(consumer_channels == NULL) {
  92                 ERR("malloc returned NULL");
  93                 return 1;
  94         }
  95
  96         CPRINTF("opening trace files");
  97         for(i=0; i<trace->nr_channels; i++) {
  98                 char tmp[100];
  99                 struct ltt_channel_struct *chan = &trace->channels[i];
 100
 101                 consumer_channels[i].chan = chan;
 102
 103                 snprintf(tmp, sizeof(tmp), "trace/%s_0", chan->channel_name);
 104                 result = consumer_channels[i].fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00600);
 105                 if(result == -1) {
 106                         perror("open");
 107                         return -1;
 108                 }
 109                 CPRINTF("\topened trace file %s", tmp);
 110
 111         }
 112         CPRINTF("done opening trace files");
 113
 114         for(;;) {
 115                 /*wait*/
 116
 117                 for(i=0; i<trace->nr_channels; i++) {
 118                         struct rchan *rchan = consumer_channels[i].chan->trans_channel_data;
 119                         struct rchan_buf *rbuf = rchan->buf;
 120                         struct ltt_channel_buf_struct *lttbuf = consumer_channels[i].chan->buf;
 121                         long consumed_old;
 122
 123                         result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old);
 124                         if(result < 0) {
 125                                 DBG("ltt_do_get_subbuf: error: %s", strerror(-result));
 126                         }
 127                         else {
 128                                 DBG("success!");
 129
 130                                 result = write(consumer_channels[i].fd, rbuf->buf_data + (consumed_old & (2 * 4096-1)), 4096);
 131                                 ltt_do_put_subbuf(rbuf, lttbuf, consumed_old);
 132                         }
 133                 }
 134
 135                 sleep(1);
 136         }
 137 }
 138
 139 void start_consumer(void)
 140 {
 141 #ifdef USE_CLONE
 142         int result;
 143
 144         result = clone(consumer, consumer_stack+sizeof(consumer_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
 145         if(result == -1) {
 146                 perror("clone");
 147         }
 148 #else
 149         pthread_t thread;
 150
 151         pthread_create(&thread, NULL, consumer, NULL);
 152 #endif
 153 }
 154
 155 static void print_markers(void)
 156 {
 157         struct marker_iter iter;
 158
 159         lock_markers();
 160         marker_iter_reset(&iter);
 161         marker_iter_start(&iter);
 162
 163         while(iter.marker) {
 164                 fprintf(stderr, "marker: %s_%s \"%s\"\n", iter.marker->channel, iter.marker->name, iter.marker->format);
 165                 marker_iter_next(&iter);
 166         }
 167         unlock_markers();
 168 }
 169
 170 void do_command(struct tracecmd *cmd)
 171 {
 172 }
 173
 174 void receive_commands()
 175 {
 176 }
 177
 178 int fd_notif = -1;
 179 void notif_cb(void)
 180 {
 181         int result;
 182         struct trctl_msg msg;
 183
 184         /* FIXME: fd_notif should probably be protected by a spinlock */
 185
 186         if(fd_notif == -1)
 187                 return;
 188
 189         msg.type = MSG_NOTIF;
 190         msg.size = sizeof(msg.type);
 191
 192         /* FIXME: don't block here */
 193         result = write(fd_notif, &msg, msg.size+sizeof(msg.size));
 194         if(result == -1) {
 195                 PERROR("write");
 196                 return;
 197         }
 198 }
 199
 200 static int inform_consumer_daemon(void)
 201 {
 202         ustcomm_request_consumer(getpid(), "metadata");
 203         ustcomm_request_consumer(getpid(), "ust");
 204 }
 205
 206 void process_blocked_consumers(void)
 207 {
 208         int n_fds = 0;
 209         struct pollfd *fds;
 210         struct blocked_consumer *bc;
 211         int idx = 0;
 212         char inbuf;
 213         int result;
 214
 215         list_for_each_entry(bc, &blocked_consumers, list) {
 216                 n_fds++;
 217         }
 218
 219         fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd));
 220         if(fds == NULL) {
 221                 ERR("malloc returned NULL");
 222                 return;
 223         }
 224
 225         list_for_each_entry(bc, &blocked_consumers, list) {
 226                 fds[idx].fd = bc->fd_producer;
 227                 fds[idx].events = POLLIN;
 228                 bc->tmp_poll_idx = idx;
 229                 idx++;
 230         }
 231
 232         result = poll(fds, n_fds, 0);
 233         if(result == -1) {
 234                 PERROR("poll");
 235                 return -1;
 236         }
 237
 238         list_for_each_entry(bc, &blocked_consumers, list) {
 239                 if(fds[bc->tmp_poll_idx].revents) {
 240                         long consumed_old = 0;
 241                         char *reply;
 242
 243                         result = read(bc->fd_producer, &inbuf, 1);
 244                         if(result == -1) {
 245                                 PERROR("read");
 246                                 continue;
 247                         }
 248                         if(result == 0) {
 249                                 DBG("PRODUCER END");
 250
 251                                 close(bc->fd_producer);
 252
 253                                 __list_del(bc->list.prev, bc->list.next);
 254
 255                                 result = ustcomm_send_reply(&bc->server, "END", &bc->src);
 256                                 if(result < 0) {
 257                                         ERR("ustcomm_send_reply failed");
 258                                         continue;
 259                                 }
 260
 261                                 continue;
 262                         }
 263
 264                         result = ltt_do_get_subbuf(bc->rbuf, bc->lttbuf, &consumed_old);
 265                         if(result == -EAGAIN) {
 266                                 WARN("missed buffer?");
 267                                 continue;
 268                         }
 269                         else if(result < 0) {
 270                                 DBG("ltt_do_get_subbuf: error: %s", strerror(-result));
 271                         }
 272                         asprintf(&reply, "%s %ld", "OK", consumed_old);
 273                         result = ustcomm_send_reply(&bc->server, reply, &bc->src);
 274                         if(result < 0) {
 275                                 ERR("ustcomm_send_reply failed");
 276                                 free(reply);
 277                                 continue;
 278                         }
 279                         free(reply);
 280
 281                         __list_del(bc->list.prev, bc->list.next);
 282                 }
 283         }
 284
 285 }
 286
 287 int listener_main(void *p)
 288 {
 289         int result;
 290
 291         DBG("LISTENER");
 292
 293         for(;;) {
 294                 uint32_t size;
 295                 struct sockaddr_un addr;
 296                 socklen_t addrlen = sizeof(addr);
 297                 char trace_name[] = "auto";
 298                 char trace_type[] = "ustrelay";
 299                 char *recvbuf;
 300                 int len;
 301                 struct ustcomm_source src;
 302
 303                 process_blocked_consumers();
 304
 305                 result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5);
 306                 if(result < 0) {
 307                         WARN("error in ustcomm_app_recv_message");
 308                         continue;
 309                 }
 310                 else if(result == 0) {
 311                         /* no message */
 312                         continue;
 313                 }
 314
 315                 DBG("received a message! it's: %s\n", recvbuf);
 316                 len = strlen(recvbuf);
 317
 318                 if(!strcmp(recvbuf, "print_markers")) {
 319                         print_markers();
 320                 }
 321                 else if(!strcmp(recvbuf, "trace_setup")) {
 322                         DBG("trace setup");
 323
 324                         result = ltt_trace_setup(trace_name);
 325                         if(result < 0) {
 326                                 ERR("ltt_trace_setup failed");
 327                                 return;
 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;
 334                         }
 335                 }
 336                 else if(!strcmp(recvbuf, "trace_alloc")) {
 337                         DBG("trace alloc");
 338
 339                         result = ltt_trace_alloc(trace_name);
 340                         if(result < 0) {
 341                                 ERR("ltt_trace_alloc failed");
 342                                 return;
 343                         }
 344                 }
 345                 else if(!strcmp(recvbuf, "trace_start")) {
 346                         DBG("trace start");
 347
 348                         result = ltt_trace_start(trace_name);
 349                         if(result < 0) {
 350                                 ERR("ltt_trace_start failed");
 351                                 continue;
 352                         }
 353                 }
 354                 else if(!strcmp(recvbuf, "trace_stop")) {
 355                         DBG("trace stop");
 356
 357                         result = ltt_trace_stop(trace_name);
 358                         if(result < 0) {
 359                                 ERR("ltt_trace_stop failed");
 360                                 return;
 361                         }
 362                 }
 363                 else if(!strcmp(recvbuf, "trace_destroy")) {
 364
 365                         DBG("trace destroy");
 366
 367                         result = ltt_trace_destroy(trace_name);
 368                         if(result < 0) {
 369                                 ERR("ltt_trace_destroy failed");
 370                                 return;
 371                         }
 372                 }
 373                 else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) {
 374                         struct ltt_trace_struct *trace;
 375                         char trace_name[] = "auto";
 376                         int i;
 377                         char *channel_name;
 378
 379                         DBG("get_shmid");
 380
 381                         channel_name = nth_token(recvbuf, 1);
 382                         if(channel_name == NULL) {
 383                                 ERR("get_shmid: cannot parse channel");
 384                                 goto next_cmd;
 385                         }
 386
 387                         ltt_lock_traces();
 388                         trace = _ltt_trace_find(trace_name);
 389                         ltt_unlock_traces();
 390
 391                         if(trace == NULL) {
 392                                 CPRINTF("cannot find trace!");
 393                                 return 1;
 394                         }
 395
 396                         for(i=0; i<trace->nr_channels; i++) {
 397                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 398                                 struct rchan_buf *rbuf = rchan->buf;
 399
 400                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 401                                         char *reply;
 402
 403                                         DBG("the shmid for the requested channel is %d", rbuf->shmid);
 404                                         asprintf(&reply, "%d", rbuf->shmid);
 405
 406                                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
 407                                         if(result) {
 408                                                 ERR("listener: get_shmid: ustcomm_send_reply failed");
 409                                                 goto next_cmd;
 410                                         }
 411
 412                                         free(reply);
 413
 414                                         break;
 415                                 }
 416                         }
 417                 }
 418                 else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) {
 419                         struct ltt_trace_struct *trace;
 420                         char trace_name[] = "auto";
 421                         int i;
 422                         char *channel_name;
 423
 424                         DBG("get_n_subbufs");
 425
 426                         channel_name = nth_token(recvbuf, 1);
 427                         if(channel_name == NULL) {
 428                                 ERR("get_n_subbufs: cannot parse channel");
 429                                 goto next_cmd;
 430                         }
 431
 432                         ltt_lock_traces();
 433                         trace = _ltt_trace_find(trace_name);
 434                         ltt_unlock_traces();
 435
 436                         if(trace == NULL) {
 437                                 CPRINTF("cannot find trace!");
 438                                 return 1;
 439                         }
 440
 441                         for(i=0; i<trace->nr_channels; i++) {
 442                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 443
 444                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 445                                         char *reply;
 446
 447                                         DBG("the n_subbufs for the requested channel is %d", rchan->n_subbufs);
 448                                         asprintf(&reply, "%d", rchan->n_subbufs);
 449
 450                                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
 451                                         if(result) {
 452                                                 ERR("listener: get_n_subbufs: ustcomm_send_reply failed");
 453                                                 goto next_cmd;
 454                                         }
 455
 456                                         free(reply);
 457
 458                                         break;
 459                                 }
 460                         }
 461                 }
 462                 else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) {
 463                         struct ltt_trace_struct *trace;
 464                         char trace_name[] = "auto";
 465                         int i;
 466                         char *channel_name;
 467
 468                         DBG("get_subbuf_size");
 469
 470                         channel_name = nth_token(recvbuf, 1);
 471                         if(channel_name == NULL) {
 472                                 ERR("get_subbuf_size: cannot parse channel");
 473                                 goto next_cmd;
 474                         }
 475
 476                         ltt_lock_traces();
 477                         trace = _ltt_trace_find(trace_name);
 478                         ltt_unlock_traces();
 479
 480                         if(trace == NULL) {
 481                                 CPRINTF("cannot find trace!");
 482                                 return 1;
 483                         }
 484
 485                         for(i=0; i<trace->nr_channels; i++) {
 486                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 487
 488                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 489                                         char *reply;
 490
 491                                         DBG("the subbuf_size for the requested channel is %d", rchan->subbuf_size);
 492                                         asprintf(&reply, "%d", rchan->subbuf_size);
 493
 494                                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
 495                                         if(result) {
 496                                                 ERR("listener: get_subbuf_size: ustcomm_send_reply failed");
 497                                                 goto next_cmd;
 498                                         }
 499
 500                                         free(reply);
 501
 502                                         break;
 503                                 }
 504                         }
 505                 }
 506                 else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) {
 507                         char *libfile;
 508
 509                         libfile = nth_token(recvbuf, 1);
 510
 511                         DBG("load_probe_lib loading %s", libfile);
 512                 }
 513                 else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) {
 514                         struct ltt_trace_struct *trace;
 515                         char trace_name[] = "auto";
 516                         int i;
 517                         char *channel_name;
 518
 519                         DBG("get_subbuf");
 520
 521                         channel_name = nth_token(recvbuf, 1);
 522                         if(channel_name == NULL) {
 523                                 ERR("get_subbuf: cannot parse channel");
 524                                 goto next_cmd;
 525                         }
 526
 527                         ltt_lock_traces();
 528                         trace = _ltt_trace_find(trace_name);
 529                         ltt_unlock_traces();
 530
 531                         if(trace == NULL) {
 532                                 CPRINTF("cannot find trace!");
 533                                 return 1;
 534                         }
 535
 536                         for(i=0; i<trace->nr_channels; i++) {
 537                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 538
 539                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 540                                         struct rchan_buf *rbuf = rchan->buf;
 541                                         struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
 542                                         char *reply;
 543                                         long consumed_old=0;
 544                                         int fd;
 545                                         struct blocked_consumer *bc;
 546
 547                                         bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer));
 548                                         if(bc == NULL) {
 549                                                 ERR("malloc returned NULL");
 550                                                 goto next_cmd;
 551                                         }
 552                                         bc->fd_consumer = src.fd;
 553                                         bc->fd_producer = lttbuf->data_ready_fd_read;
 554                                         bc->rbuf = rbuf;
 555                                         bc->lttbuf = lttbuf;
 556                                         bc->src = src;
 557                                         bc->server = ustcomm_app.server;
 558
 559                                         list_add(&bc->list, &blocked_consumers);
 560
 561                                         break;
 562                                 }
 563                         }
 564                 }
 565                 else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) {
 566                         struct ltt_trace_struct *trace;
 567                         char trace_name[] = "auto";
 568                         int i;
 569                         char *channel_name;
 570                         long consumed_old;
 571                         char *consumed_old_str;
 572                         char *endptr;
 573
 574                         DBG("put_subbuf");
 575
 576                         channel_name = strdup_malloc(nth_token(recvbuf, 1));
 577                         if(channel_name == NULL) {
 578                                 ERR("put_subbuf_size: cannot parse channel");
 579                                 goto next_cmd;
 580                         }
 581
 582                         consumed_old_str = strdup_malloc(nth_token(recvbuf, 2));
 583                         if(consumed_old_str == NULL) {
 584                                 ERR("put_subbuf: cannot parse consumed_old");
 585                                 goto next_cmd;
 586                         }
 587                         consumed_old = strtol(consumed_old_str, &endptr, 10);
 588                         if(*endptr != '\0') {
 589                                 ERR("put_subbuf: invalid value for consumed_old");
 590                                 goto next_cmd;
 591                         }
 592
 593                         ltt_lock_traces();
 594                         trace = _ltt_trace_find(trace_name);
 595                         ltt_unlock_traces();
 596
 597                         if(trace == NULL) {
 598                                 CPRINTF("cannot find trace!");
 599                                 return 1;
 600                         }
 601
 602                         for(i=0; i<trace->nr_channels; i++) {
 603                                 struct rchan *rchan = trace->channels[i].trans_channel_data;
 604
 605                                 if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 606                                         struct rchan_buf *rbuf = rchan->buf;
 607                                         struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
 608                                         char *reply;
 609                                         long consumed_old=0;
 610
 611                                         result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old);
 612                                         if(result < 0) {
 613                                                 WARN("ltt_do_put_subbuf: error");
 614                                         }
 615                                         else {
 616                                                 DBG("ltt_do_put_subbuf: success");
 617                                         }
 618                                         asprintf(&reply, "%s", "OK", consumed_old);
 619
 620                                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
 621                                         if(result) {
 622                                                 ERR("listener: put_subbuf: ustcomm_send_reply failed");
 623                                                 goto next_cmd;
 624                                         }
 625
 626                                         free(reply);
 627
 628                                         break;
 629                                 }
 630                         }
 631
 632                         free(channel_name);
 633                         free(consumed_old_str);
 634                 }
 635 //              else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) {
 636 //                      struct ltt_trace_struct *trace;
 637 //                      char trace_name[] = "auto";
 638 //                      int i;
 639 //                      char *channel_name;
 640 //
 641 //                      DBG("get_notifications");
 642 //
 643 //                      channel_name = strdup_malloc(nth_token(recvbuf, 1));
 644 //                      if(channel_name == NULL) {
 645 //                              ERR("put_subbuf_size: cannot parse channel");
 646 //                              goto next_cmd;
 647 //                      }
 648 //
 649 //                      ltt_lock_traces();
 650 //                      trace = _ltt_trace_find(trace_name);
 651 //                      ltt_unlock_traces();
 652 //
 653 //                      if(trace == NULL) {
 654 //                              CPRINTF("cannot find trace!");
 655 //                              return 1;
 656 //                      }
 657 //
 658 //                      for(i=0; i<trace->nr_channels; i++) {
 659 //                              struct rchan *rchan = trace->channels[i].trans_channel_data;
 660 //                              int fd;
 661 //
 662 //                              if(!strcmp(trace->channels[i].channel_name, channel_name)) {
 663 //                                      struct rchan_buf *rbuf = rchan->buf;
 664 //                                      struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
 665 //
 666 //                                      result = fd = ustcomm_app_detach_client(&ustcomm_app, &src);
 667 //                                      if(result == -1) {
 668 //                                              ERR("ustcomm_app_detach_client failed");
 669 //                                              goto next_cmd;
 670 //                                      }
 671 //
 672 //                                      lttbuf->wake_consumer_arg = (void *) fd;
 673 //
 674 //                                      smp_wmb();
 675 //
 676 //                                      lttbuf->call_wake_consumer = 1;
 677 //
 678 //                                      break;
 679 //                              }
 680 //                      }
 681 //
 682 //                      free(channel_name);
 683 //              }
 684                 else {
 685                         ERR("unable to parse message: %s", recvbuf);
 686                 }
 687
 688         next_cmd:
 689                 free(recvbuf);
 690         }
 691 }
 692
 693 static char listener_stack[16384];
 694
 695 void create_listener(void)
 696 {
 697         int result;
 698         static char listener_stack[16384];
 699         //char *listener_stack = malloc(16384);
 700
 701 #ifdef USE_CLONE
 702         result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
 703         if(result == -1) {
 704                 perror("clone");
 705         }
 706 #else
 707         pthread_t thread;
 708
 709         pthread_create(&thread, NULL, listener_main, NULL);
 710 #endif
 711 }
 712
 713 /* The signal handler itself. Signals must be setup so there cannot be
 714    nested signals. */
 715
 716 void sighandler(int sig)
 717 {
 718         static char have_listener = 0;
 719         DBG("sighandler");
 720
 721         if(!have_listener) {
 722                 create_listener();
 723                 have_listener = 1;
 724         }
 725 }
 726
 727 /* Called by the app signal handler to chain it to us. */
 728
 729 void chain_signal(void)
 730 {
 731         sighandler(USTSIGNAL);
 732 }
 733
 734 static int init_socket(void)
 735 {
 736         return ustcomm_init_app(getpid(), &ustcomm_app);
 737 }
 738
 739 static void destroy_socket(void)
 740 {
 741 //      int result;
 742 //
 743 //      if(mysocketfile[0] == '\0')
 744 //              return;
 745 //
 746 //      result = unlink(mysocketfile);
 747 //      if(result == -1) {
 748 //              PERROR("unlink");
 749 //      }
 750 }
 751
 752 static int init_signal_handler(void)
 753 {
 754         /* Attempt to handler SIGIO. If the main program wants to
 755          * handle it, fine, it'll override us. They it'll have to
 756          * use the chaining function.
 757          */
 758
 759         int result;
 760         struct sigaction act;
 761
 762         result = sigemptyset(&act.sa_mask);
 763         if(result == -1) {
 764                 PERROR("sigemptyset");
 765                 return -1;
 766         }
 767
 768         act.sa_handler = sighandler;
 769         act.sa_flags = SA_RESTART;
 770
 771         /* Only defer ourselves. Also, try to restart interrupted
 772          * syscalls to disturb the traced program as little as possible.
 773          */
 774         result = sigaction(SIGIO, &act, NULL);
 775         if(result == -1) {
 776                 PERROR("sigaction");
 777                 return -1;
 778         }
 779
 780         return 0;
 781 }
 782
 783 static void auto_probe_connect(struct marker *m)
 784 {
 785         int result;
 786
 787         result = ltt_marker_connect(m->channel, m->name, "default");
 788         if(result)
 789                 ERR("ltt_marker_connect");
 790
 791         DBG("just auto connected marker %s %s to probe default", m->channel, m->name);
 792 }
 793
 794 static void __attribute__((constructor(101))) init0()
 795 {
 796         DBG("UST_AUTOPROBE constructor");
 797         if(getenv("UST_AUTOPROBE")) {
 798                 marker_set_new_marker_cb(auto_probe_connect);
 799         }
 800 }
 801
 802 static void fini(void);
 803
 804 static void __attribute__((constructor(1000))) init()
 805 {
 806         int result;
 807
 808         DBG("UST_TRACE constructor");
 809
 810         /* Must create socket before signal handler to prevent races.
 811          */
 812         result = init_socket();
 813         if(result == -1) {
 814                 ERR("init_socket error");
 815                 return;
 816         }
 817         result = init_signal_handler();
 818         if(result == -1) {
 819                 ERR("init_signal_handler error");
 820                 return;
 821         }
 822
 823         if(getenv("UST_TRACE")) {
 824                 char trace_name[] = "auto";
 825                 char trace_type[] = "ustrelay";
 826
 827                 DBG("starting early tracing");
 828
 829                 /* Ensure marker control is initialized */
 830                 init_marker_control();
 831
 832                 /* Ensure relay is initialized */
 833                 init_ustrelay_transport();
 834
 835                 /* Ensure markers are initialized */
 836                 init_markers();
 837
 838                 /* In case. */
 839                 ltt_channels_register("ust");
 840
 841                 result = ltt_trace_setup(trace_name);
 842                 if(result < 0) {
 843                         ERR("ltt_trace_setup failed");
 844                         return;
 845                 }
 846
 847                 result = ltt_trace_set_type(trace_name, trace_type);
 848                 if(result < 0) {
 849                         ERR("ltt_trace_set_type failed");
 850                         return;
 851                 }
 852
 853                 result = ltt_trace_alloc(trace_name);
 854                 if(result < 0) {
 855                         ERR("ltt_trace_alloc failed");
 856                         return;
 857                 }
 858
 859                 result = ltt_trace_start(trace_name);
 860                 if(result < 0) {
 861                         ERR("ltt_trace_start failed");
 862                         return;
 863                 }
 864                 //start_consumer();
 865                 inform_consumer_daemon();
 866         }
 867
 868
 869         return;
 870
 871         /* should decrementally destroy stuff if error */
 872
 873 }
 874
 875 /* This is only called if we terminate normally, not with an unhandled signal,
 876  * so we cannot rely on it. */
 877
 878 static void __attribute__((destructor)) fini()
 879 {
 880         int result;
 881
 882         /* if trace running, finish it */
 883
 884         DBG("destructor stopping traces");
 885
 886         result = ltt_trace_stop("auto");
 887         if(result == -1) {
 888                 ERR("ltt_trace_stop error");
 889         }
 890
 891         result = ltt_trace_destroy("auto");
 892         if(result == -1) {
 893                 ERR("ltt_trace_destroy error");
 894         }
 895
 896         /* FIXME: wait for the consumer to be done */
 897         DBG("waiting 5 sec for consume");
 898         sleep(5);
 899
 900         destroy_socket();
 901 }