libust/tracectl.c

   1 /* Copyright (C) 2009  Pierre-Marc Fournier
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <stdio.h>
  20 #include <stdint.h>
  21 #include <signal.h>
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <sys/un.h>
  25 #include <sched.h>
  26 #include <fcntl.h>
  27 #include <poll.h>
  28 #include <regex.h>
  29
  30 #include <urcu-bp.h>
  31
  32 #include <ust/marker.h>
  33 #include <ust/tracectl.h>
  34 #include "tracer.h"
  35 #include "usterr.h"
  36 #include "ustcomm.h"
  37 #include "buffers.h"
  38 #include "marker-control.h"
  39
  40 //#define USE_CLONE
  41
  42 #define USTSIGNAL SIGIO
  43
  44 #define MAX_MSG_SIZE (100)
  45 #define MSG_NOTIF 1
  46 #define MSG_REGISTER_NOTIF 2
  47
  48 char consumer_stack[10000];
  49
  50 /* This should only be accessed by the constructor, before the creation
  51  * of the listener, and then only by the listener.
  52  */
  53 s64 pidunique = -1LL;
  54
  55 struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers);
  56
  57 static struct ustcomm_app ustcomm_app;
  58
  59 struct tracecmd { /* no padding */
  60         uint32_t size;
  61         uint16_t command;
  62 };
  63
  64 /* volatile because shared between the listener and the main thread */
  65 volatile sig_atomic_t buffers_to_export = 0;
  66
  67 struct trctl_msg {
  68         /* size: the size of all the fields except size itself */
  69         uint32_t size;
  70         uint16_t type;
  71         /* Only the necessary part of the payload is transferred. It
  72          * may even be none of it.
  73          */
  74         char payload[94];
  75 };
  76
  77 struct consumer_channel {
  78         int fd;
  79         struct ltt_channel_struct *chan;
  80 };
  81
  82 struct blocked_consumer {
  83         int fd_consumer;
  84         int fd_producer;
  85         int tmp_poll_idx;
  86
  87         /* args to ustcomm_send_reply */
  88         struct ustcomm_server server;
  89         struct ustcomm_source src;
  90
  91         /* args to ust_buffers_get_subbuf */
  92         struct ust_buffer *buf;
  93
  94         struct list_head list;
  95 };
  96
  97 static long long make_pidunique(void)
  98 {
  99         s64 retval;
 100         struct timeval tv;
 101
 102         gettimeofday(&tv, NULL);
 103
 104         retval = tv.tv_sec;
 105         retval <<= 32;
 106         retval |= tv.tv_usec;
 107
 108         return retval;
 109 }
 110
 111 static void print_markers(FILE *fp)
 112 {
 113         struct marker_iter iter;
 114
 115         lock_markers();
 116         marker_iter_reset(&iter);
 117         marker_iter_start(&iter);
 118
 119         while(iter.marker) {
 120                 fprintf(fp, "marker: %s/%s %d \"%s\" %p\n", iter.marker->channel, iter.marker->name, (int)imv_read(iter.marker->state), iter.marker->format, iter.marker->location);
 121                 marker_iter_next(&iter);
 122         }
 123         unlock_markers();
 124 }
 125
 126 static int init_socket(void);
 127
 128 /* This needs to be called whenever a new thread is created. It notifies
 129  * liburcu of the new thread.
 130  */
 131
 132 void ust_register_thread(void)
 133 {
 134         rcu_register_thread();
 135 }
 136
 137 int fd_notif = -1;
 138 void notif_cb(void)
 139 {
 140         int result;
 141         struct trctl_msg msg;
 142
 143         /* FIXME: fd_notif should probably be protected by a spinlock */
 144
 145         if(fd_notif == -1)
 146                 return;
 147
 148         msg.type = MSG_NOTIF;
 149         msg.size = sizeof(msg.type);
 150
 151         /* FIXME: don't block here */
 152         result = write(fd_notif, &msg, msg.size+sizeof(msg.size));
 153         if(result == -1) {
 154                 PERROR("write");
 155                 return;
 156         }
 157 }
 158
 159 /* Ask the daemon to collect a trace called trace_name and being
 160  * produced by this pid.
 161  *
 162  * The trace must be at least allocated. (It can also be started.)
 163  * This is because _ltt_trace_find is used.
 164  */
 165
 166 static void inform_consumer_daemon(const char *trace_name)
 167 {
 168         int i,j;
 169         struct ust_trace *trace;
 170         pid_t pid = getpid();
 171         int result;
 172
 173         ltt_lock_traces();
 174
 175         trace = _ltt_trace_find(trace_name);
 176         if(trace == NULL) {
 177                 WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name);
 178                 goto finish;
 179         }
 180
 181         for(i=0; i < trace->nr_channels; i++) {
 182                 /* iterate on all cpus */
 183                 for(j=0; j<trace->channels[i].n_cpus; j++) {
 184                         char *buf;
 185                         asprintf(&buf, "%s_%d", trace->channels[i].channel_name, j);
 186                         result = ustcomm_request_consumer(pid, buf);
 187                         if(result == -1) {
 188                                 WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name);
 189                                 /* continue even if fail */
 190                         }
 191                         free(buf);
 192                         buffers_to_export++;
 193                 }
 194         }
 195
 196         finish:
 197         ltt_unlock_traces();
 198 }
 199
 200 void process_blocked_consumers(void)
 201 {
 202         int n_fds = 0;
 203         struct pollfd *fds;
 204         struct blocked_consumer *bc;
 205         int idx = 0;
 206         char inbuf;
 207         int result;
 208
 209         list_for_each_entry(bc, &blocked_consumers, list) {
 210                 n_fds++;
 211         }
 212
 213         fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd));
 214         if(fds == NULL) {
 215                 ERR("malloc returned NULL");
 216                 return;
 217         }
 218
 219         list_for_each_entry(bc, &blocked_consumers, list) {
 220                 fds[idx].fd = bc->fd_producer;
 221                 fds[idx].events = POLLIN;
 222                 bc->tmp_poll_idx = idx;
 223                 idx++;
 224         }
 225
 226         while((result = poll(fds, n_fds, 0)) == -1 && errno == EINTR)
 227                 /* nothing */;
 228         if(result == -1) {
 229                 PERROR("poll");
 230                 return;
 231         }
 232
 233         list_for_each_entry(bc, &blocked_consumers, list) {
 234                 if(fds[bc->tmp_poll_idx].revents) {
 235                         long consumed_old = 0;
 236                         char *reply;
 237
 238                         result = read(bc->fd_producer, &inbuf, 1);
 239                         if(result == -1) {
 240                                 PERROR("read");
 241                                 continue;
 242                         }
 243                         if(result == 0) {
 244                                 DBG("PRODUCER END");
 245
 246                                 close(bc->fd_producer);
 247
 248                                 list_del(&bc->list);
 249
 250                                 result = ustcomm_send_reply(&bc->server, "END", &bc->src);
 251                                 if(result < 0) {
 252                                         ERR("ustcomm_send_reply failed");
 253                                         continue;
 254                                 }
 255
 256                                 continue;
 257                         }
 258
 259                         result = ust_buffers_get_subbuf(bc->buf, &consumed_old);
 260                         if(result == -EAGAIN) {
 261                                 WARN("missed buffer?");
 262                                 continue;
 263                         }
 264                         else if(result < 0) {
 265                                 DBG("ust_buffers_get_subbuf: error: %s", strerror(-result));
 266                         }
 267                         asprintf(&reply, "%s %ld", "OK", consumed_old);
 268                         result = ustcomm_send_reply(&bc->server, reply, &bc->src);
 269                         if(result < 0) {
 270                                 ERR("ustcomm_send_reply failed");
 271                                 free(reply);
 272                                 continue;
 273                         }
 274                         free(reply);
 275
 276                         list_del(&bc->list);
 277                 }
 278         }
 279
 280 }
 281
 282 void seperate_channel_cpu(const char *channel_and_cpu, char **channel, int *cpu)
 283 {
 284         const char *sep;
 285
 286         sep = rindex(channel_and_cpu, '_');
 287         if(sep == NULL) {
 288                 *cpu = -1;
 289                 sep = channel_and_cpu + strlen(channel_and_cpu);
 290         }
 291         else {
 292                 *cpu = atoi(sep+1);
 293         }
 294
 295         asprintf(channel, "%.*s", (int)(sep-channel_and_cpu), channel_and_cpu);
 296 }
 297
 298 static int do_cmd_get_shmid(const char *recvbuf, struct ustcomm_source *src)
 299 {
 300         int retval = 0;
 301         struct ust_trace *trace;
 302         char trace_name[] = "auto";
 303         int i;
 304         char *channel_and_cpu;
 305         int found = 0;
 306         int result;
 307         char *ch_name;
 308         int ch_cpu;
 309
 310         DBG("get_shmid");
 311
 312         channel_and_cpu = nth_token(recvbuf, 1);
 313         if(channel_and_cpu == NULL) {
 314                 ERR("cannot parse channel");
 315                 goto end;
 316         }
 317
 318         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 319         if(ch_cpu == -1) {
 320                 ERR("problem parsing channel name");
 321                 goto free_short_chan_name;
 322         }
 323
 324         ltt_lock_traces();
 325         trace = _ltt_trace_find(trace_name);
 326         ltt_unlock_traces();
 327
 328         if(trace == NULL) {
 329                 ERR("cannot find trace!");
 330                 retval = -1;
 331                 goto free_short_chan_name;
 332         }
 333
 334         for(i=0; i<trace->nr_channels; i++) {
 335                 struct ust_channel *channel = &trace->channels[i];
 336                 struct ust_buffer *buf = channel->buf[ch_cpu];
 337
 338                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 339                         char *reply;
 340
 341 //                      DBG("the shmid for the requested channel is %d", buf->shmid);
 342 //                      DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids);
 343                         asprintf(&reply, "%d %d", buf->shmid, channel->buf_struct_shmids[ch_cpu]);
 344
 345                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 346                         if(result) {
 347                                 ERR("ustcomm_send_reply failed");
 348                                 free(reply);
 349                                 retval = -1;
 350                                 goto free_short_chan_name;
 351                         }
 352
 353                         free(reply);
 354
 355                         found = 1;
 356                         break;
 357                 }
 358         }
 359
 360         if(!found) {
 361                 ERR("channel not found (%s)", channel_and_cpu);
 362         }
 363
 364         free_short_chan_name:
 365         free(ch_name);
 366
 367         end:
 368         return retval;
 369 }
 370
 371 static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src)
 372 {
 373         int retval = 0;
 374         struct ust_trace *trace;
 375         char trace_name[] = "auto";
 376         int i;
 377         char *channel_and_cpu;
 378         int found = 0;
 379         int result;
 380         char *ch_name;
 381         int ch_cpu;
 382
 383         DBG("get_n_subbufs");
 384
 385         channel_and_cpu = nth_token(recvbuf, 1);
 386         if(channel_and_cpu == NULL) {
 387                 ERR("cannot parse channel");
 388                 goto end;
 389         }
 390
 391         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 392         if(ch_cpu == -1) {
 393                 ERR("problem parsing channel name");
 394                 goto free_short_chan_name;
 395         }
 396
 397         ltt_lock_traces();
 398         trace = _ltt_trace_find(trace_name);
 399         ltt_unlock_traces();
 400
 401         if(trace == NULL) {
 402                 ERR("cannot find trace!");
 403                 retval = -1;
 404                 goto free_short_chan_name;
 405         }
 406
 407         for(i=0; i<trace->nr_channels; i++) {
 408                 struct ust_channel *channel = &trace->channels[i];
 409
 410                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 411                         char *reply;
 412
 413                         DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt);
 414                         asprintf(&reply, "%d", channel->subbuf_cnt);
 415
 416                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 417                         if(result) {
 418                                 ERR("ustcomm_send_reply failed");
 419                                 free(reply);
 420                                 retval = -1;
 421                                 goto free_short_chan_name;
 422                         }
 423
 424                         free(reply);
 425                         found = 1;
 426                         break;
 427                 }
 428         }
 429         if(found == 0) {
 430                 ERR("unable to find channel");
 431         }
 432
 433         free_short_chan_name:
 434         free(ch_name);
 435
 436         end:
 437         return retval;
 438 }
 439
 440 static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src)
 441 {
 442         int retval = 0;
 443         struct ust_trace *trace;
 444         char trace_name[] = "auto";
 445         int i;
 446         char *channel_and_cpu;
 447         int found = 0;
 448         int result;
 449         char *ch_name;
 450         int ch_cpu;
 451
 452         DBG("get_subbuf_size");
 453
 454         channel_and_cpu = nth_token(recvbuf, 1);
 455         if(channel_and_cpu == NULL) {
 456                 ERR("cannot parse channel");
 457                 goto end;
 458         }
 459
 460         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 461         if(ch_cpu == -1) {
 462                 ERR("problem parsing channel name");
 463                 goto free_short_chan_name;
 464         }
 465
 466         ltt_lock_traces();
 467         trace = _ltt_trace_find(trace_name);
 468         ltt_unlock_traces();
 469
 470         if(trace == NULL) {
 471                 ERR("cannot find trace!");
 472                 retval = -1;
 473                 goto free_short_chan_name;
 474         }
 475
 476         for(i=0; i<trace->nr_channels; i++) {
 477                 struct ust_channel *channel = &trace->channels[i];
 478
 479                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 480                         char *reply;
 481
 482                         DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size);
 483                         asprintf(&reply, "%zd", channel->subbuf_size);
 484
 485                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 486                         if(result) {
 487                                 ERR("ustcomm_send_reply failed");
 488                                 free(reply);
 489                                 retval = -1;
 490                                 goto free_short_chan_name;
 491                         }
 492
 493                         free(reply);
 494                         found = 1;
 495                         break;
 496                 }
 497         }
 498         if(found == 0) {
 499                 ERR("unable to find channel");
 500         }
 501
 502         free_short_chan_name:
 503         free(ch_name);
 504
 505         end:
 506         return retval;
 507 }
 508
 509 static unsigned int poweroftwo(unsigned int x)
 510 {
 511     unsigned int power2 = 1;
 512     unsigned int hardcoded = 2147483648; /* FIX max 2^31 */
 513
 514     if (x < 2)
 515         return 2;
 516
 517     while (power2 < x && power2 < hardcoded)
 518         power2 *= 2;
 519
 520     return power2;
 521 }
 522
 523 static int do_cmd_set_subbuf_size(const char *recvbuf, struct ustcomm_source *src)
 524 {
 525         char *channel_slash_size;
 526         char ch_name[256]="";
 527         unsigned int size, power;
 528         int retval = 0;
 529         struct ust_trace *trace;
 530         char trace_name[] = "auto";
 531         int i;
 532         int found = 0;
 533
 534         DBG("set_subbuf_size");
 535
 536         channel_slash_size = nth_token(recvbuf, 1);
 537         sscanf(channel_slash_size, "%255[^/]/%u", ch_name, &size);
 538
 539         if(ch_name == NULL) {
 540                 ERR("cannot parse channel");
 541                 goto end;
 542         }
 543
 544         power = poweroftwo(size);
 545         if (power != size)
 546                 WARN("using the next 2^n = %u\n", power);
 547
 548         ltt_lock_traces();
 549         trace = _ltt_trace_find_setup(trace_name);
 550         if(trace == NULL) {
 551                 ERR("cannot find trace!");
 552                 retval = -1;
 553                 goto end;
 554         }
 555
 556         for(i = 0; i < trace->nr_channels; i++) {
 557                 struct ust_channel *channel = &trace->channels[i];
 558
 559                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 560
 561                         channel->subbuf_size = power;
 562                         DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size);
 563
 564                         found = 1;
 565                         break;
 566                 }
 567         }
 568         if(found == 0) {
 569                 ERR("unable to find channel");
 570         }
 571
 572         end:
 573         ltt_unlock_traces();
 574         return retval;
 575 }
 576
 577 static int do_cmd_set_subbuf_num(const char *recvbuf, struct ustcomm_source *src)
 578 {
 579         char *channel_slash_num;
 580         char ch_name[256]="";
 581         unsigned int num;
 582         int retval = 0;
 583         struct ust_trace *trace;
 584         char trace_name[] = "auto";
 585         int i;
 586         int found = 0;
 587
 588         DBG("set_subbuf_num");
 589
 590         channel_slash_num = nth_token(recvbuf, 1);
 591         sscanf(channel_slash_num, "%255[^/]/%u", ch_name, &num);
 592
 593         if(ch_name == NULL) {
 594                 ERR("cannot parse channel");
 595                 goto end;
 596         }
 597         if (num < 2) {
 598                 ERR("subbuffer count should be greater than 2");
 599                 goto end;
 600         }
 601
 602         ltt_lock_traces();
 603         trace = _ltt_trace_find_setup(trace_name);
 604         if(trace == NULL) {
 605                 ERR("cannot find trace!");
 606                 retval = -1;
 607                 goto end;
 608         }
 609
 610         for(i = 0; i < trace->nr_channels; i++) {
 611                 struct ust_channel *channel = &trace->channels[i];
 612
 613                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 614
 615                         channel->subbuf_cnt = num;
 616                         DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt);
 617
 618                         found = 1;
 619                         break;
 620                 }
 621         }
 622         if(found == 0) {
 623                 ERR("unable to find channel");
 624         }
 625
 626         end:
 627         ltt_unlock_traces();
 628         return retval;
 629 }
 630
 631 static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src)
 632 {
 633         int retval = 0;
 634         struct ust_trace *trace;
 635         char trace_name[] = "auto";
 636         int i;
 637         char *channel_and_cpu;
 638         int found = 0;
 639         char *ch_name;
 640         int ch_cpu;
 641
 642         DBG("get_subbuf");
 643
 644         channel_and_cpu = nth_token(recvbuf, 1);
 645         if(channel_and_cpu == NULL) {
 646                 ERR("cannot parse channel");
 647                 goto end;
 648         }
 649
 650         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 651         if(ch_cpu == -1) {
 652                 ERR("problem parsing channel name");
 653                 goto free_short_chan_name;
 654         }
 655
 656         ltt_lock_traces();
 657         trace = _ltt_trace_find(trace_name);
 658
 659         if(trace == NULL) {
 660                 int result;
 661
 662                 WARN("Cannot find trace. It was likely destroyed by the user.");
 663                 result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src);
 664                 if(result) {
 665                         ERR("ustcomm_send_reply failed");
 666                         retval = -1;
 667                         goto unlock_traces;
 668                 }
 669
 670                 goto unlock_traces;
 671         }
 672
 673         for(i=0; i<trace->nr_channels; i++) {
 674                 struct ust_channel *channel = &trace->channels[i];
 675
 676                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 677                         struct ust_buffer *buf = channel->buf[ch_cpu];
 678                         struct blocked_consumer *bc;
 679
 680                         found = 1;
 681
 682                         bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer));
 683                         if(bc == NULL) {
 684                                 ERR("malloc returned NULL");
 685                                 goto unlock_traces;
 686                         }
 687                         bc->fd_consumer = src->fd;
 688                         bc->fd_producer = buf->data_ready_fd_read;
 689                         bc->buf = buf;
 690                         bc->src = *src;
 691                         bc->server = ustcomm_app.server;
 692
 693                         list_add(&bc->list, &blocked_consumers);
 694
 695                         /* Being here is the proof the daemon has mapped the buffer in its
 696                          * memory. We may now decrement buffers_to_export.
 697                          */
 698                         if(atomic_long_read(&buf->consumed) == 0) {
 699                                 DBG("decrementing buffers_to_export");
 700                                 buffers_to_export--;
 701                         }
 702
 703                         break;
 704                 }
 705         }
 706         if(found == 0) {
 707                 ERR("unable to find channel");
 708         }
 709
 710         unlock_traces:
 711         ltt_unlock_traces();
 712
 713         free_short_chan_name:
 714         free(ch_name);
 715
 716         end:
 717         return retval;
 718 }
 719
 720 static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src)
 721 {
 722         int retval = 0;
 723         struct ust_trace *trace;
 724         char trace_name[] = "auto";
 725         int i;
 726         char *channel_and_cpu;
 727         int found = 0;
 728         int result;
 729         char *ch_name;
 730         int ch_cpu;
 731         long consumed_old;
 732         char *consumed_old_str;
 733         char *endptr;
 734         char *reply = NULL;
 735
 736         DBG("put_subbuf");
 737
 738         channel_and_cpu = strdup_malloc(nth_token(recvbuf, 1));
 739         if(channel_and_cpu == NULL) {
 740                 ERR("cannot parse channel");
 741                 retval = -1;
 742                 goto end;
 743         }
 744
 745         consumed_old_str = strdup_malloc(nth_token(recvbuf, 2));
 746         if(consumed_old_str == NULL) {
 747                 ERR("cannot parse consumed_old");
 748                 retval = -1;
 749                 goto free_channel_and_cpu;
 750         }
 751         consumed_old = strtol(consumed_old_str, &endptr, 10);
 752         if(*endptr != '\0') {
 753                 ERR("invalid value for consumed_old");
 754                 retval = -1;
 755                 goto free_consumed_old_str;
 756         }
 757
 758         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 759         if(ch_cpu == -1) {
 760                 ERR("problem parsing channel name");
 761                 retval = -1;
 762                 goto free_short_chan_name;
 763         }
 764
 765         ltt_lock_traces();
 766         trace = _ltt_trace_find(trace_name);
 767
 768         if(trace == NULL) {
 769                 WARN("Cannot find trace. It was likely destroyed by the user.");
 770                 result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src);
 771                 if(result) {
 772                         ERR("ustcomm_send_reply failed");
 773                         retval = -1;
 774                         goto unlock_traces;
 775                 }
 776
 777                 goto unlock_traces;
 778         }
 779
 780         for(i=0; i<trace->nr_channels; i++) {
 781                 struct ust_channel *channel = &trace->channels[i];
 782
 783                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 784                         struct ust_buffer *buf = channel->buf[ch_cpu];
 785
 786                         found = 1;
 787
 788                         result = ust_buffers_put_subbuf(buf, consumed_old);
 789                         if(result < 0) {
 790                                 WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu);
 791                                 asprintf(&reply, "%s", "ERROR");
 792                         }
 793                         else {
 794                                 DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu);
 795                                 asprintf(&reply, "%s", "OK");
 796                         }
 797
 798                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 799                         if(result) {
 800                                 ERR("ustcomm_send_reply failed");
 801                                 free(reply);
 802                                 retval = -1;
 803                                 goto unlock_traces;
 804                         }
 805
 806                         free(reply);
 807                         break;
 808                 }
 809         }
 810         if(found == 0) {
 811                 ERR("unable to find channel");
 812         }
 813
 814         unlock_traces:
 815         ltt_unlock_traces();
 816         free_short_chan_name:
 817         free(ch_name);
 818         free_consumed_old_str:
 819         free(consumed_old_str);
 820         free_channel_and_cpu:
 821         free(channel_and_cpu);
 822
 823         end:
 824         return retval;
 825 }
 826
 827 void *listener_main(void *p)
 828 {
 829         int result;
 830
 831         ust_register_thread();
 832
 833         DBG("LISTENER");
 834
 835         for(;;) {
 836                 char trace_name[] = "auto";
 837                 char trace_type[] = "ustrelay";
 838                 char *recvbuf;
 839                 int len;
 840                 struct ustcomm_source src;
 841
 842                 process_blocked_consumers();
 843
 844                 result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5);
 845                 if(result < 0) {
 846                         WARN("error in ustcomm_app_recv_message");
 847                         continue;
 848                 }
 849                 else if(result == 0) {
 850                         /* no message */
 851                         continue;
 852                 }
 853
 854                 DBG("received a message! it's: %s", recvbuf);
 855                 len = strlen(recvbuf);
 856
 857                 if(!strcmp(recvbuf, "print_markers")) {
 858                         print_markers(stderr);
 859                 }
 860                 else if(!strcmp(recvbuf, "list_markers")) {
 861                         char *ptr;
 862                         size_t size;
 863                         FILE *fp;
 864
 865                         fp = open_memstream(&ptr, &size);
 866                         print_markers(fp);
 867                         fclose(fp);
 868
 869                         result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src);
 870
 871                         free(ptr);
 872                 }
 873                 else if(!strcmp(recvbuf, "start")) {
 874                         /* start is an operation that setups the trace, allocates it and starts it */
 875                         result = ltt_trace_setup(trace_name);
 876                         if(result < 0) {
 877                                 ERR("ltt_trace_setup failed");
 878                                 return (void *)1;
 879                         }
 880
 881                         result = ltt_trace_set_type(trace_name, trace_type);
 882                         if(result < 0) {
 883                                 ERR("ltt_trace_set_type failed");
 884                                 return (void *)1;
 885                         }
 886
 887                         result = ltt_trace_alloc(trace_name);
 888                         if(result < 0) {
 889                                 ERR("ltt_trace_alloc failed");
 890                                 return (void *)1;
 891                         }
 892
 893                         inform_consumer_daemon(trace_name);
 894
 895                         result = ltt_trace_start(trace_name);
 896                         if(result < 0) {
 897                                 ERR("ltt_trace_start failed");
 898                                 continue;
 899                         }
 900                 }
 901                 else if(!strcmp(recvbuf, "trace_setup")) {
 902                         DBG("trace setup");
 903
 904                         result = ltt_trace_setup(trace_name);
 905                         if(result < 0) {
 906                                 ERR("ltt_trace_setup failed");
 907                                 return (void *)1;
 908                         }
 909
 910                         result = ltt_trace_set_type(trace_name, trace_type);
 911                         if(result < 0) {
 912                                 ERR("ltt_trace_set_type failed");
 913                                 return (void *)1;
 914                         }
 915                 }
 916                 else if(!strcmp(recvbuf, "trace_alloc")) {
 917                         DBG("trace alloc");
 918
 919                         result = ltt_trace_alloc(trace_name);
 920                         if(result < 0) {
 921                                 ERR("ltt_trace_alloc failed");
 922                                 return (void *)1;
 923                         }
 924                         inform_consumer_daemon(trace_name);
 925                 }
 926                 else if(!strcmp(recvbuf, "trace_create")) {
 927                         DBG("trace create");
 928
 929                         result = ltt_trace_setup(trace_name);
 930                         if(result < 0) {
 931                                 ERR("ltt_trace_setup failed");
 932                                 return (void *)1;
 933                         }
 934
 935                         result = ltt_trace_set_type(trace_name, trace_type);
 936                         if(result < 0) {
 937                                 ERR("ltt_trace_set_type failed");
 938                                 return (void *)1;
 939                         }
 940                 }
 941                 else if(!strcmp(recvbuf, "trace_start")) {
 942                         DBG("trace start");
 943
 944                         result = ltt_trace_alloc(trace_name);
 945                         if(result < 0) {
 946                                 ERR("ltt_trace_alloc failed");
 947                                 return (void *)1;
 948                         }
 949                         if(!result) {
 950                                 inform_consumer_daemon(trace_name);
 951                         }
 952
 953                         result = ltt_trace_start(trace_name);
 954                         if(result < 0) {
 955                                 ERR("ltt_trace_start failed");
 956                                 continue;
 957                         }
 958                 }
 959                 else if(!strcmp(recvbuf, "trace_stop")) {
 960                         DBG("trace stop");
 961
 962                         result = ltt_trace_stop(trace_name);
 963                         if(result < 0) {
 964                                 ERR("ltt_trace_stop failed");
 965                                 return (void *)1;
 966                         }
 967                 }
 968                 else if(!strcmp(recvbuf, "trace_destroy")) {
 969
 970                         DBG("trace destroy");
 971
 972                         result = ltt_trace_destroy(trace_name, 0);
 973                         if(result < 0) {
 974                                 ERR("ltt_trace_destroy failed");
 975                                 return (void *)1;
 976                         }
 977                 }
 978                 else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) {
 979                         do_cmd_get_shmid(recvbuf, &src);
 980                 }
 981                 else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) {
 982                         do_cmd_get_n_subbufs(recvbuf, &src);
 983                 }
 984                 else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) {
 985                         do_cmd_get_subbuf_size(recvbuf, &src);
 986                 }
 987                 else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) {
 988                         char *libfile;
 989
 990                         libfile = nth_token(recvbuf, 1);
 991
 992                         DBG("load_probe_lib loading %s", libfile);
 993
 994                         free(libfile);
 995                 }
 996                 else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) {
 997                         do_cmd_get_subbuffer(recvbuf, &src);
 998                 }
 999                 else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) {
1000                         do_cmd_put_subbuffer(recvbuf, &src);
1001                 }
1002                 else if(nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) {
1003                         do_cmd_set_subbuf_size(recvbuf, &src);
1004                 }
1005                 else if(nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) {
1006                         do_cmd_set_subbuf_num(recvbuf, &src);
1007                 }
1008                 else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) {
1009                         char *channel_slash_name = nth_token(recvbuf, 1);
1010                         char channel_name[256]="";
1011                         char marker_name[256]="";
1012
1013                         result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name);
1014
1015                         if(channel_name == NULL || marker_name == NULL) {
1016                                 WARN("invalid marker name");
1017                                 goto next_cmd;
1018                         }
1019
1020                         result = ltt_marker_connect(channel_name, marker_name, "default");
1021                         if(result < 0) {
1022                                 WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name);
1023                         }
1024                 }
1025                 else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) {
1026                         char *channel_slash_name = nth_token(recvbuf, 1);
1027                         char *marker_name;
1028                         char *channel_name;
1029
1030                         result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name);
1031
1032                         if(marker_name == NULL) {
1033                         }
1034
1035                         result = ltt_marker_disconnect(channel_name, marker_name, "default");
1036                         if(result < 0) {
1037                                 WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name);
1038                         }
1039                 }
1040                 else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) {
1041                         char *reply;
1042
1043                         asprintf(&reply, "%lld", pidunique);
1044
1045                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
1046                         if(result) {
1047                                 ERR("listener: get_pidunique: ustcomm_send_reply failed");
1048                                 goto next_cmd;
1049                         }
1050
1051                         free(reply);
1052                 }
1053 //              else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) {
1054 //                      struct ust_trace *trace;
1055 //                      char trace_name[] = "auto";
1056 //                      int i;
1057 //                      char *channel_name;
1058 //
1059 //                      DBG("get_notifications");
1060 //
1061 //                      channel_name = strdup_malloc(nth_token(recvbuf, 1));
1062 //                      if(channel_name == NULL) {
1063 //                              ERR("put_subbuf_size: cannot parse channel");
1064 //                              goto next_cmd;
1065 //                      }
1066 //
1067 //                      ltt_lock_traces();
1068 //                      trace = _ltt_trace_find(trace_name);
1069 //                      ltt_unlock_traces();
1070 //
1071 //                      if(trace == NULL) {
1072 //                              ERR("cannot find trace!");
1073 //                              return (void *)1;
1074 //                      }
1075 //
1076 //                      for(i=0; i<trace->nr_channels; i++) {
1077 //                              struct rchan *rchan = trace->channels[i].trans_channel_data;
1078 //                              int fd;
1079 //
1080 //                              if(!strcmp(trace->channels[i].channel_name, channel_name)) {
1081 //                                      struct rchan_buf *rbuf = rchan->buf;
1082 //                                      struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
1083 //
1084 //                                      result = fd = ustcomm_app_detach_client(&ustcomm_app, &src);
1085 //                                      if(result == -1) {
1086 //                                              ERR("ustcomm_app_detach_client failed");
1087 //                                              goto next_cmd;
1088 //                                      }
1089 //
1090 //                                      lttbuf->wake_consumer_arg = (void *) fd;
1091 //
1092 //                                      smp_wmb();
1093 //
1094 //                                      lttbuf->call_wake_consumer = 1;
1095 //
1096 //                                      break;
1097 //                              }
1098 //                      }
1099 //
1100 //                      free(channel_name);
1101 //              }
1102                 else {
1103                         ERR("unable to parse message: %s", recvbuf);
1104                 }
1105
1106         next_cmd:
1107                 free(recvbuf);
1108         }
1109 }
1110
1111 volatile sig_atomic_t have_listener = 0;
1112
1113 void create_listener(void)
1114 {
1115 #ifdef USE_CLONE
1116         static char listener_stack[16384];
1117         int result;
1118 #else
1119         pthread_t thread;
1120 #endif
1121
1122         if(have_listener) {
1123                 WARN("not creating listener because we already had one");
1124                 return;
1125         }
1126
1127 #ifdef USE_CLONE
1128         result = clone((int (*)(void *)) listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
1129         if(result == -1) {
1130                 perror("clone");
1131                 return;
1132         }
1133 #else
1134
1135         pthread_create(&thread, NULL, listener_main, NULL);
1136 #endif
1137
1138         have_listener = 1;
1139 }
1140
1141 static int init_socket(void)
1142 {
1143         return ustcomm_init_app(getpid(), &ustcomm_app);
1144 }
1145
1146 #define AUTOPROBE_DISABLED      0
1147 #define AUTOPROBE_ENABLE_ALL    1
1148 #define AUTOPROBE_ENABLE_REGEX  2
1149 static int autoprobe_method = AUTOPROBE_DISABLED;
1150 static regex_t autoprobe_regex;
1151
1152 static void auto_probe_connect(struct marker *m)
1153 {
1154         int result;
1155
1156         char* concat_name = NULL;
1157         const char *probe_name = "default";
1158
1159         if(autoprobe_method == AUTOPROBE_DISABLED) {
1160                 return;
1161         }
1162         else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) {
1163                 result = asprintf(&concat_name, "%s/%s", m->channel, m->name);
1164                 if(result == -1) {
1165                         ERR("auto_probe_connect: asprintf failed (marker %s/%s)",
1166                                 m->channel, m->name);
1167                         return;
1168                 }
1169                 if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) {
1170                         free(concat_name);
1171                         return;
1172                 }
1173                 free(concat_name);
1174         }
1175
1176         result = ltt_marker_connect(m->channel, m->name, probe_name);
1177         if(result && result != -EEXIST)
1178                 ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result);
1179
1180         DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name);
1181
1182 }
1183
1184 static void __attribute__((constructor)) init()
1185 {
1186         int result;
1187         char* autoprobe_val = NULL;
1188
1189         /* Assign the pidunique, to be able to differentiate the processes with same
1190          * pid, (before and after an exec).
1191          */
1192         pidunique = make_pidunique();
1193
1194         /* Initialize RCU in case the constructor order is not good. */
1195         rcu_init();
1196
1197         /* It is important to do this before events start to be generated. */
1198         ust_register_thread();
1199
1200         DBG("Tracectl constructor");
1201
1202         /* Must create socket before signal handler to prevent races.
1203          */
1204         result = init_socket();
1205         if(result == -1) {
1206                 ERR("init_socket error");
1207                 return;
1208         }
1209
1210         create_listener();
1211
1212         autoprobe_val = getenv("UST_AUTOPROBE");
1213         if(autoprobe_val) {
1214                 struct marker_iter iter;
1215
1216                 DBG("Autoprobe enabled.");
1217
1218                 /* Ensure markers are initialized */
1219                 //init_markers();
1220
1221                 /* Ensure marker control is initialized, for the probe */
1222                 init_marker_control();
1223
1224                 /* first, set the callback that will connect the
1225                  * probe on new markers
1226                  */
1227                 if(autoprobe_val[0] == '/') {
1228                         result = regcomp(&autoprobe_regex, autoprobe_val+1, 0);
1229                         if (result) {
1230                                 char regexerr[150];
1231
1232                                 regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr));
1233                                 ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr);
1234                                 /* don't crash the application just for this */
1235                         }
1236                         else {
1237                                 autoprobe_method = AUTOPROBE_ENABLE_REGEX;
1238                         }
1239                 }
1240                 else {
1241                         /* just enable all instrumentation */
1242                         autoprobe_method = AUTOPROBE_ENABLE_ALL;
1243                 }
1244
1245                 marker_set_new_marker_cb(auto_probe_connect);
1246
1247                 /* Now, connect the probes that were already registered. */
1248                 marker_iter_reset(&iter);
1249                 marker_iter_start(&iter);
1250
1251                 DBG("now iterating on markers already registered");
1252                 while(iter.marker) {
1253                         DBG("now iterating on marker %s", iter.marker->name);
1254                         auto_probe_connect(iter.marker);
1255                         marker_iter_next(&iter);
1256                 }
1257         }
1258
1259         if(getenv("UST_TRACE")) {
1260                 char trace_name[] = "auto";
1261                 char trace_type[] = "ustrelay";
1262
1263                 DBG("starting early tracing");
1264
1265                 /* Ensure marker control is initialized */
1266                 init_marker_control();
1267
1268                 /* Ensure markers are initialized */
1269                 init_markers();
1270
1271                 /* Ensure buffers are initialized, for the transport to be available.
1272                  * We are about to set a trace type and it will fail without this.
1273                  */
1274                 init_ustrelay_transport();
1275
1276                 /* FIXME: When starting early tracing (here), depending on the
1277                  * order of constructors, it is very well possible some marker
1278                  * sections are not yet registered. Because of this, some
1279                  * channels may not be registered. Yet, we are about to ask the
1280                  * daemon to collect the channels. Channels which are not yet
1281                  * registered will not be collected.
1282                  *
1283                  * Currently, in LTTng, there is no way to add a channel after
1284                  * trace start. The reason for this is that it induces complex
1285                  * concurrency issues on the trace structures, which can only
1286                  * be resolved using RCU. This has not been done yet. As a
1287                  * workaround, we are forcing the registration of the "ust"
1288                  * channel here. This is the only channel (apart from metadata)
1289                  * that can be reliably used in early tracing.
1290                  *
1291                  * Non-early tracing does not have this problem and can use
1292                  * arbitrary channel names.
1293                  */
1294                 ltt_channels_register("ust");
1295
1296                 result = ltt_trace_setup(trace_name);
1297                 if(result < 0) {
1298                         ERR("ltt_trace_setup failed");
1299                         return;
1300                 }
1301
1302                 result = ltt_trace_set_type(trace_name, trace_type);
1303                 if(result < 0) {
1304                         ERR("ltt_trace_set_type failed");
1305                         return;
1306                 }
1307
1308                 result = ltt_trace_alloc(trace_name);
1309                 if(result < 0) {
1310                         ERR("ltt_trace_alloc failed");
1311                         return;
1312                 }
1313
1314                 result = ltt_trace_start(trace_name);
1315                 if(result < 0) {
1316                         ERR("ltt_trace_start failed");
1317                         return;
1318                 }
1319
1320                 /* Do this after the trace is started in order to avoid creating confusion
1321                  * if the trace fails to start. */
1322                 inform_consumer_daemon(trace_name);
1323         }
1324
1325
1326         return;
1327
1328         /* should decrementally destroy stuff if error */
1329
1330 }
1331
1332 /* This is only called if we terminate normally, not with an unhandled signal,
1333  * so we cannot rely on it. However, for now, LTTV requires that the header of
1334  * the last sub-buffer contain a valid end time for the trace. This is done
1335  * automatically only when the trace is properly stopped.
1336  *
1337  * If the traced program crashed, it is always possible to manually add the
1338  * right value in the header, or to open the trace in text mode.
1339  *
1340  * FIXME: Fix LTTV so it doesn't need this.
1341  */
1342
1343 static void destroy_traces(void)
1344 {
1345         int result;
1346
1347         /* if trace running, finish it */
1348
1349         DBG("destructor stopping traces");
1350
1351         result = ltt_trace_stop("auto");
1352         if(result == -1) {
1353                 ERR("ltt_trace_stop error");
1354         }
1355
1356         result = ltt_trace_destroy("auto", 0);
1357         if(result == -1) {
1358                 ERR("ltt_trace_destroy error");
1359         }
1360 }
1361
1362 static int trace_recording(void)
1363 {
1364         int retval = 0;
1365         struct ust_trace *trace;
1366
1367         ltt_lock_traces();
1368
1369         list_for_each_entry(trace, &ltt_traces.head, list) {
1370                 if(trace->active) {
1371                         retval = 1;
1372                         break;
1373                 }
1374         }
1375
1376         ltt_unlock_traces();
1377
1378         return retval;
1379 }
1380
1381 #if 0
1382 static int have_consumer(void)
1383 {
1384         return !list_empty(&blocked_consumers);
1385 }
1386 #endif
1387
1388 int restarting_usleep(useconds_t usecs)
1389 {
1390         struct timespec tv;
1391         int result;
1392
1393         tv.tv_sec = 0;
1394         tv.tv_nsec = usecs * 1000;
1395
1396         do {
1397                 result = nanosleep(&tv, &tv);
1398         } while(result == -1 && errno == EINTR);
1399
1400         return result;
1401 }
1402
1403 /* This destructor keeps the process alive for a few seconds in order
1404  * to leave time to ustd to connect to its buffers. This is necessary
1405  * for programs whose execution is very short. It is also useful in all
1406  * programs when tracing is started close to the end of the program
1407  * execution.
1408  *
1409  * FIXME: For now, this only works for the first trace created in a
1410  * process.
1411  */
1412
1413 static void __attribute__((destructor)) keepalive()
1414 {
1415         if(trace_recording() && buffers_to_export) {
1416                 int total = 0;
1417                 DBG("Keeping process alive for consumer daemon...");
1418                 while(buffers_to_export) {
1419                         const int interv = 200000;
1420                         restarting_usleep(interv);
1421                         total += interv;
1422
1423                         if(total >= 3000000) {
1424                                 WARN("non-consumed buffers remaining after wait limit; not waiting anymore");
1425                                 break;
1426                         }
1427                 }
1428                 DBG("Finally dying...");
1429         }
1430
1431         destroy_traces();
1432
1433         ustcomm_fini_app(&ustcomm_app);
1434 }
1435
1436 void ust_potential_exec(void)
1437 {
1438         trace_mark(ust, potential_exec, MARK_NOARGS);
1439
1440         DBG("test");
1441
1442         keepalive();
1443 }
1444
1445 /* Notify ust that there was a fork. This needs to be called inside
1446  * the new process, anytime a process whose memory is not shared with
1447  * the parent is created. If this function is not called, the events
1448  * of the new process will not be collected.
1449  *
1450  * Signals should be disabled before the fork and reenabled only after
1451  * this call in order to guarantee tracing is not started before ust_fork()
1452  * sanitizes the new process.
1453  */
1454
1455 static void ust_fork(void)
1456 {
1457         struct blocked_consumer *bc;
1458         struct blocked_consumer *deletable_bc = NULL;
1459         int result;
1460
1461         /* FIXME: technically, the locks could have been taken before the fork */
1462         DBG("ust: forking");
1463
1464         /* break lock if necessary */
1465         ltt_unlock_traces();
1466
1467         ltt_trace_stop("auto");
1468         ltt_trace_destroy("auto", 1);
1469         /* Delete all active connections */
1470         ustcomm_close_all_connections(&ustcomm_app.server);
1471
1472         /* Delete all blocked consumers */
1473         list_for_each_entry(bc, &blocked_consumers, list) {
1474                 close(bc->fd_producer);
1475                 close(bc->fd_consumer);
1476                 free(deletable_bc);
1477                 deletable_bc = bc;
1478                 list_del(&bc->list);
1479         }
1480
1481         buffers_to_export = 0;
1482         have_listener = 0;
1483         init_socket();
1484         create_listener();
1485         ltt_trace_setup("auto");
1486         result = ltt_trace_set_type("auto", "ustrelay");
1487         if(result < 0) {
1488                 ERR("ltt_trace_set_type failed");
1489                 return;
1490         }
1491
1492         ltt_trace_alloc("auto");
1493         ltt_trace_start("auto");
1494         inform_consumer_daemon("auto");
1495 }
1496
1497 void ust_before_fork(ust_fork_info_t *fork_info)
1498 {
1499         /* Disable signals. This is to avoid that the child
1500          * intervenes before it is properly setup for tracing. It is
1501          * safer to disable all signals, because then we know we are not
1502          * breaking anything by restoring the original mask.
1503          */
1504         sigset_t all_sigs;
1505         int result;
1506
1507         /* FIXME:
1508                 - only do this if tracing is active
1509         */
1510
1511         /* Disable signals */
1512         sigfillset(&all_sigs);
1513         result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs);
1514         if(result == -1) {
1515                 PERROR("sigprocmask");
1516                 return;
1517         }
1518 }
1519
1520 /* Don't call this function directly in a traced program */
1521 static void ust_after_fork_common(ust_fork_info_t *fork_info)
1522 {
1523         int result;
1524
1525         /* Restore signals */
1526         result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL);
1527         if(result == -1) {
1528                 PERROR("sigprocmask");
1529                 return;
1530         }
1531 }
1532
1533 void ust_after_fork_parent(ust_fork_info_t *fork_info)
1534 {
1535         /* Reenable signals */
1536         ust_after_fork_common(fork_info);
1537 }
1538
1539 void ust_after_fork_child(ust_fork_info_t *fork_info)
1540 {
1541         /* First sanitize the child */
1542         ust_fork();
1543
1544         /* Then reenable interrupts */
1545         ust_after_fork_common(fork_info);
1546 }
1547