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