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                 buffers_to_export--;
 362         }
 363         else {
 364                 ERR("channel not found (%s)", channel_and_cpu);
 365         }
 366
 367         free_short_chan_name:
 368         free(ch_name);
 369
 370         end:
 371         return retval;
 372 }
 373
 374 static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src)
 375 {
 376         int retval = 0;
 377         struct ust_trace *trace;
 378         char trace_name[] = "auto";
 379         int i;
 380         char *channel_and_cpu;
 381         int found = 0;
 382         int result;
 383         char *ch_name;
 384         int ch_cpu;
 385
 386         DBG("get_n_subbufs");
 387
 388         channel_and_cpu = nth_token(recvbuf, 1);
 389         if(channel_and_cpu == NULL) {
 390                 ERR("cannot parse channel");
 391                 goto end;
 392         }
 393
 394         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 395         if(ch_cpu == -1) {
 396                 ERR("problem parsing channel name");
 397                 goto free_short_chan_name;
 398         }
 399
 400         ltt_lock_traces();
 401         trace = _ltt_trace_find(trace_name);
 402         ltt_unlock_traces();
 403
 404         if(trace == NULL) {
 405                 ERR("cannot find trace!");
 406                 retval = -1;
 407                 goto free_short_chan_name;
 408         }
 409
 410         for(i=0; i<trace->nr_channels; i++) {
 411                 struct ust_channel *channel = &trace->channels[i];
 412
 413                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 414                         char *reply;
 415
 416                         DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt);
 417                         asprintf(&reply, "%d", channel->subbuf_cnt);
 418
 419                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 420                         if(result) {
 421                                 ERR("ustcomm_send_reply failed");
 422                                 free(reply);
 423                                 retval = -1;
 424                                 goto free_short_chan_name;
 425                         }
 426
 427                         free(reply);
 428                         found = 1;
 429                         break;
 430                 }
 431         }
 432         if(found == 0) {
 433                 ERR("unable to find channel");
 434         }
 435
 436         free_short_chan_name:
 437         free(ch_name);
 438
 439         end:
 440         return retval;
 441 }
 442
 443 static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src)
 444 {
 445         int retval = 0;
 446         struct ust_trace *trace;
 447         char trace_name[] = "auto";
 448         int i;
 449         char *channel_and_cpu;
 450         int found = 0;
 451         int result;
 452         char *ch_name;
 453         int ch_cpu;
 454
 455         DBG("get_subbuf_size");
 456
 457         channel_and_cpu = nth_token(recvbuf, 1);
 458         if(channel_and_cpu == NULL) {
 459                 ERR("cannot parse channel");
 460                 goto end;
 461         }
 462
 463         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 464         if(ch_cpu == -1) {
 465                 ERR("problem parsing channel name");
 466                 goto free_short_chan_name;
 467         }
 468
 469         ltt_lock_traces();
 470         trace = _ltt_trace_find(trace_name);
 471         ltt_unlock_traces();
 472
 473         if(trace == NULL) {
 474                 ERR("cannot find trace!");
 475                 retval = -1;
 476                 goto free_short_chan_name;
 477         }
 478
 479         for(i=0; i<trace->nr_channels; i++) {
 480                 struct ust_channel *channel = &trace->channels[i];
 481
 482                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 483                         char *reply;
 484
 485                         DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size);
 486                         asprintf(&reply, "%zd", channel->subbuf_size);
 487
 488                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 489                         if(result) {
 490                                 ERR("ustcomm_send_reply failed");
 491                                 free(reply);
 492                                 retval = -1;
 493                                 goto free_short_chan_name;
 494                         }
 495
 496                         free(reply);
 497                         found = 1;
 498                         break;
 499                 }
 500         }
 501         if(found == 0) {
 502                 ERR("unable to find channel");
 503         }
 504
 505         free_short_chan_name:
 506         free(ch_name);
 507
 508         end:
 509         return retval;
 510 }
 511
 512 unsigned int poweroftwo(unsigned int x)
 513 {
 514     unsigned int power2 = 1;
 515     unsigned int hardcoded = 2147483648; /* FIX max 2^31 */
 516
 517     if (x < 2)
 518         return 2;
 519
 520     while (power2 < x && power2 < hardcoded)
 521         power2 *= 2;
 522
 523     return power2;
 524 }
 525
 526 static int do_cmd_set_subbuf_size(const char *recvbuf, struct ustcomm_source *src)
 527 {
 528         char *channel_slash_size;
 529         char ch_name[256]="";
 530         unsigned int size, power;
 531         int retval = 0;
 532         struct ust_trace *trace;
 533         char trace_name[] = "auto";
 534         int i;
 535         int found = 0;
 536
 537         DBG("set_subbuf_size");
 538
 539         channel_slash_size = nth_token(recvbuf, 1);
 540         sscanf(channel_slash_size, "%255[^/]/%u", ch_name, &size);
 541
 542         if(ch_name == NULL) {
 543                 ERR("cannot parse channel");
 544                 goto end;
 545         }
 546
 547         power = poweroftwo(size);
 548         if (power != size)
 549                 WARN("using the next 2^n = %u\n", power);
 550
 551         ltt_lock_traces();
 552         trace = _ltt_trace_find_setup(trace_name);
 553         if(trace == NULL) {
 554                 ERR("cannot find trace!");
 555                 ltt_unlock_traces();
 556                 retval = -1;
 557                 goto end;
 558         }
 559
 560         for(i = 0; i < trace->nr_channels; i++) {
 561                 struct ust_channel *channel = &trace->channels[i];
 562
 563                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 564
 565                         channel->subbuf_size = power;
 566                         DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size);
 567
 568                         found = 1;
 569                         break;
 570                 }
 571         }
 572         if(found == 0) {
 573                 ERR("unable to find channel");
 574         }
 575
 576         ltt_unlock_traces();
 577
 578         end:
 579         return retval;
 580 }
 581
 582 static int do_cmd_set_subbuf_num(const char *recvbuf, struct ustcomm_source *src)
 583 {
 584         char *channel_slash_num;
 585         char ch_name[256]="";
 586         unsigned int num;
 587         int retval = 0;
 588         struct ust_trace *trace;
 589         char trace_name[] = "auto";
 590         int i;
 591         int found = 0;
 592
 593         DBG("set_subbuf_num");
 594
 595         channel_slash_num = nth_token(recvbuf, 1);
 596         sscanf(channel_slash_num, "%255[^/]/%u", ch_name, &num);
 597
 598         if(ch_name == NULL) {
 599                 ERR("cannot parse channel");
 600                 goto end;
 601         }
 602         if (num < 2) {
 603                 ERR("subbuffer count should be greater than 2");
 604                 goto end;
 605         }
 606
 607         ltt_lock_traces();
 608         trace = _ltt_trace_find_setup(trace_name);
 609         if(trace == NULL) {
 610                 ERR("cannot find trace!");
 611                 ltt_unlock_traces();
 612                 retval = -1;
 613                 goto end;
 614         }
 615
 616         for(i = 0; i < trace->nr_channels; i++) {
 617                 struct ust_channel *channel = &trace->channels[i];
 618
 619                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 620
 621                         channel->subbuf_cnt = num;
 622                         DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt);
 623
 624                         found = 1;
 625                         break;
 626                 }
 627         }
 628         if(found == 0) {
 629                 ERR("unable to find channel");
 630         }
 631
 632         ltt_unlock_traces();
 633
 634         end:
 635         return retval;
 636 }
 637
 638 static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src)
 639 {
 640         int retval = 0;
 641         struct ust_trace *trace;
 642         char trace_name[] = "auto";
 643         int i;
 644         char *channel_and_cpu;
 645         int found = 0;
 646         char *ch_name;
 647         int ch_cpu;
 648
 649         DBG("get_subbuf");
 650
 651         channel_and_cpu = nth_token(recvbuf, 1);
 652         if(channel_and_cpu == NULL) {
 653                 ERR("cannot parse channel");
 654                 goto end;
 655         }
 656
 657         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 658         if(ch_cpu == -1) {
 659                 ERR("problem parsing channel name");
 660                 goto free_short_chan_name;
 661         }
 662
 663         ltt_lock_traces();
 664         trace = _ltt_trace_find(trace_name);
 665         ltt_unlock_traces();
 666
 667         if(trace == NULL) {
 668                 char *reply;
 669                 int result;
 670
 671                 WARN("Cannot find trace. It was likely destroyed by the user.");
 672                 asprintf(&reply, "%s", "NOTFOUND");
 673                 result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 674                 if(result) {
 675                         ERR("ustcomm_send_reply failed");
 676                         free(reply);
 677                         retval = -1;
 678                         goto free_short_chan_name;
 679                 }
 680
 681                 free(reply);
 682                 goto free_short_chan_name;
 683         }
 684
 685         for(i=0; i<trace->nr_channels; i++) {
 686                 struct ust_channel *channel = &trace->channels[i];
 687
 688                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 689                         struct ust_buffer *buf = channel->buf[ch_cpu];
 690                         struct blocked_consumer *bc;
 691
 692                         found = 1;
 693
 694                         bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer));
 695                         if(bc == NULL) {
 696                                 ERR("malloc returned NULL");
 697                                 goto free_short_chan_name;
 698                         }
 699                         bc->fd_consumer = src->fd;
 700                         bc->fd_producer = buf->data_ready_fd_read;
 701                         bc->buf = buf;
 702                         bc->src = *src;
 703                         bc->server = ustcomm_app.server;
 704
 705                         list_add(&bc->list, &blocked_consumers);
 706
 707                         break;
 708                 }
 709         }
 710         if(found == 0) {
 711                 ERR("unable to find channel");
 712         }
 713
 714         free_short_chan_name:
 715         free(ch_name);
 716
 717         end:
 718         return retval;
 719 }
 720
 721 static int do_cmd_put_subbuffer(const char *recvbuf, struct ustcomm_source *src)
 722 {
 723         int retval = 0;
 724         struct ust_trace *trace;
 725         char trace_name[] = "auto";
 726         int i;
 727         char *channel_and_cpu;
 728         int found = 0;
 729         int result;
 730         char *ch_name;
 731         int ch_cpu;
 732         long consumed_old;
 733         char *consumed_old_str;
 734         char *endptr;
 735         char *reply = NULL;
 736
 737         DBG("put_subbuf");
 738
 739         channel_and_cpu = strdup_malloc(nth_token(recvbuf, 1));
 740         if(channel_and_cpu == NULL) {
 741                 ERR("cannot parse channel");
 742                 retval = -1;
 743                 goto end;
 744         }
 745
 746         consumed_old_str = strdup_malloc(nth_token(recvbuf, 2));
 747         if(consumed_old_str == NULL) {
 748                 ERR("cannot parse consumed_old");
 749                 retval = -1;
 750                 goto free_channel_and_cpu;
 751         }
 752         consumed_old = strtol(consumed_old_str, &endptr, 10);
 753         if(*endptr != '\0') {
 754                 ERR("invalid value for consumed_old");
 755                 retval = -1;
 756                 goto free_consumed_old_str;
 757         }
 758
 759         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 760         if(ch_cpu == -1) {
 761                 ERR("problem parsing channel name");
 762                 retval = -1;
 763                 goto free_short_chan_name;
 764         }
 765
 766         ltt_lock_traces();
 767         trace = _ltt_trace_find(trace_name);
 768         ltt_unlock_traces();
 769
 770         if(trace == NULL) {
 771                 WARN("Cannot find trace. It was likely destroyed by the user.");
 772                 asprintf(&reply, "%s", "NOTFOUND");
 773                 result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 774                 if(result) {
 775                         ERR("ustcomm_send_reply failed");
 776                         free(reply);
 777                         retval = -1;
 778                         goto free_short_chan_name;
 779                 }
 780
 781                 free(reply);
 782                 goto free_short_chan_name;
 783         }
 784
 785         for(i=0; i<trace->nr_channels; i++) {
 786                 struct ust_channel *channel = &trace->channels[i];
 787
 788                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 789                         struct ust_buffer *buf = channel->buf[ch_cpu];
 790
 791                         found = 1;
 792
 793                         result = ust_buffers_put_subbuf(buf, consumed_old);
 794                         if(result < 0) {
 795                                 WARN("ust_buffers_put_subbuf: error (subbuf=%s)", channel_and_cpu);
 796                                 asprintf(&reply, "%s", "ERROR");
 797                         }
 798                         else {
 799                                 DBG("ust_buffers_put_subbuf: success (subbuf=%s)", channel_and_cpu);
 800                                 asprintf(&reply, "%s", "OK");
 801                         }
 802
 803                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 804                         if(result) {
 805                                 ERR("ustcomm_send_reply failed");
 806                                 free(reply);
 807                                 retval = -1;
 808                                 goto free_channel_and_cpu;
 809                         }
 810
 811                         free(reply);
 812                         break;
 813                 }
 814         }
 815         if(found == 0) {
 816                 ERR("unable to find channel");
 817         }
 818
 819         free_short_chan_name:
 820         free(ch_name);
 821         free_consumed_old_str:
 822         free(consumed_old_str);
 823         free_channel_and_cpu:
 824         free(channel_and_cpu);
 825
 826         end:
 827         return retval;
 828 }
 829
 830 void *listener_main(void *p)
 831 {
 832         int result;
 833
 834         ust_register_thread();
 835
 836         DBG("LISTENER");
 837
 838         for(;;) {
 839                 char trace_name[] = "auto";
 840                 char trace_type[] = "ustrelay";
 841                 char *recvbuf;
 842                 int len;
 843                 struct ustcomm_source src;
 844
 845                 process_blocked_consumers();
 846
 847                 result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5);
 848                 if(result < 0) {
 849                         WARN("error in ustcomm_app_recv_message");
 850                         continue;
 851                 }
 852                 else if(result == 0) {
 853                         /* no message */
 854                         continue;
 855                 }
 856
 857                 DBG("received a message! it's: %s", recvbuf);
 858                 len = strlen(recvbuf);
 859
 860                 if(!strcmp(recvbuf, "print_markers")) {
 861                         print_markers(stderr);
 862                 }
 863                 else if(!strcmp(recvbuf, "list_markers")) {
 864                         char *ptr;
 865                         size_t size;
 866                         FILE *fp;
 867
 868                         fp = open_memstream(&ptr, &size);
 869                         print_markers(fp);
 870                         fclose(fp);
 871
 872                         result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src);
 873
 874                         free(ptr);
 875                 }
 876                 else if(!strcmp(recvbuf, "start")) {
 877                         /* start is an operation that setups the trace, allocates it and starts it */
 878                         result = ltt_trace_setup(trace_name);
 879                         if(result < 0) {
 880                                 ERR("ltt_trace_setup failed");
 881                                 return (void *)1;
 882                         }
 883
 884                         result = ltt_trace_set_type(trace_name, trace_type);
 885                         if(result < 0) {
 886                                 ERR("ltt_trace_set_type failed");
 887                                 return (void *)1;
 888                         }
 889
 890                         result = ltt_trace_alloc(trace_name);
 891                         if(result < 0) {
 892                                 ERR("ltt_trace_alloc failed");
 893                                 return (void *)1;
 894                         }
 895
 896                         inform_consumer_daemon(trace_name);
 897
 898                         result = ltt_trace_start(trace_name);
 899                         if(result < 0) {
 900                                 ERR("ltt_trace_start failed");
 901                                 continue;
 902                         }
 903                 }
 904                 else if(!strcmp(recvbuf, "trace_setup")) {
 905                         DBG("trace setup");
 906
 907                         result = ltt_trace_setup(trace_name);
 908                         if(result < 0) {
 909                                 ERR("ltt_trace_setup failed");
 910                                 return (void *)1;
 911                         }
 912
 913                         result = ltt_trace_set_type(trace_name, trace_type);
 914                         if(result < 0) {
 915                                 ERR("ltt_trace_set_type failed");
 916                                 return (void *)1;
 917                         }
 918                 }
 919                 else if(!strcmp(recvbuf, "trace_alloc")) {
 920                         DBG("trace alloc");
 921
 922                         result = ltt_trace_alloc(trace_name);
 923                         if(result < 0) {
 924                                 ERR("ltt_trace_alloc failed");
 925                                 return (void *)1;
 926                         }
 927                         inform_consumer_daemon(trace_name);
 928                 }
 929                 else if(!strcmp(recvbuf, "trace_create")) {
 930                         DBG("trace create");
 931
 932                         result = ltt_trace_setup(trace_name);
 933                         if(result < 0) {
 934                                 ERR("ltt_trace_setup failed");
 935                                 return (void *)1;
 936                         }
 937
 938                         result = ltt_trace_set_type(trace_name, trace_type);
 939                         if(result < 0) {
 940                                 ERR("ltt_trace_set_type failed");
 941                                 return (void *)1;
 942                         }
 943                 }
 944                 else if(!strcmp(recvbuf, "trace_start")) {
 945                         DBG("trace start");
 946
 947                         result = ltt_trace_alloc(trace_name);
 948                         if(result < 0) {
 949                                 ERR("ltt_trace_alloc failed");
 950                                 return (void *)1;
 951                         }
 952                         if(!result) {
 953                                 inform_consumer_daemon(trace_name);
 954                         }
 955
 956                         result = ltt_trace_start(trace_name);
 957                         if(result < 0) {
 958                                 ERR("ltt_trace_start failed");
 959                                 continue;
 960                         }
 961                 }
 962                 else if(!strcmp(recvbuf, "trace_stop")) {
 963                         DBG("trace stop");
 964
 965                         result = ltt_trace_stop(trace_name);
 966                         if(result < 0) {
 967                                 ERR("ltt_trace_stop failed");
 968                                 return (void *)1;
 969                         }
 970                 }
 971                 else if(!strcmp(recvbuf, "trace_destroy")) {
 972
 973                         DBG("trace destroy");
 974
 975                         result = ltt_trace_destroy(trace_name);
 976                         if(result < 0) {
 977                                 ERR("ltt_trace_destroy failed");
 978                                 return (void *)1;
 979                         }
 980                 }
 981                 else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) {
 982                         do_cmd_get_shmid(recvbuf, &src);
 983                 }
 984                 else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) {
 985                         do_cmd_get_n_subbufs(recvbuf, &src);
 986                 }
 987                 else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) {
 988                         do_cmd_get_subbuf_size(recvbuf, &src);
 989                 }
 990                 else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) {
 991                         char *libfile;
 992
 993                         libfile = nth_token(recvbuf, 1);
 994
 995                         DBG("load_probe_lib loading %s", libfile);
 996
 997                         free(libfile);
 998                 }
 999                 else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) {
1000                         do_cmd_get_subbuffer(recvbuf, &src);
1001                 }
1002                 else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) {
1003                         do_cmd_put_subbuffer(recvbuf, &src);
1004                 }
1005                 else if(nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) {
1006                         do_cmd_set_subbuf_size(recvbuf, &src);
1007                 }
1008                 else if(nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) {
1009                         do_cmd_set_subbuf_num(recvbuf, &src);
1010                 }
1011                 else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) {
1012                         char *channel_slash_name = nth_token(recvbuf, 1);
1013                         char channel_name[256]="";
1014                         char marker_name[256]="";
1015
1016                         result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name);
1017
1018                         if(channel_name == NULL || marker_name == NULL) {
1019                                 WARN("invalid marker name");
1020                                 goto next_cmd;
1021                         }
1022
1023                         result = ltt_marker_connect(channel_name, marker_name, "default");
1024                         if(result < 0) {
1025                                 WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name);
1026                         }
1027                 }
1028                 else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) {
1029                         char *channel_slash_name = nth_token(recvbuf, 1);
1030                         char *marker_name;
1031                         char *channel_name;
1032
1033                         result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name);
1034
1035                         if(marker_name == NULL) {
1036                         }
1037
1038                         result = ltt_marker_disconnect(channel_name, marker_name, "default");
1039                         if(result < 0) {
1040                                 WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name);
1041                         }
1042                 }
1043                 else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) {
1044                         char *reply;
1045
1046                         asprintf(&reply, "%lld", pidunique);
1047
1048                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
1049                         if(result) {
1050                                 ERR("listener: get_pidunique: ustcomm_send_reply failed");
1051                                 goto next_cmd;
1052                         }
1053
1054                         free(reply);
1055                 }
1056 //              else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) {
1057 //                      struct ust_trace *trace;
1058 //                      char trace_name[] = "auto";
1059 //                      int i;
1060 //                      char *channel_name;
1061 //
1062 //                      DBG("get_notifications");
1063 //
1064 //                      channel_name = strdup_malloc(nth_token(recvbuf, 1));
1065 //                      if(channel_name == NULL) {
1066 //                              ERR("put_subbuf_size: cannot parse channel");
1067 //                              goto next_cmd;
1068 //                      }
1069 //
1070 //                      ltt_lock_traces();
1071 //                      trace = _ltt_trace_find(trace_name);
1072 //                      ltt_unlock_traces();
1073 //
1074 //                      if(trace == NULL) {
1075 //                              ERR("cannot find trace!");
1076 //                              return (void *)1;
1077 //                      }
1078 //
1079 //                      for(i=0; i<trace->nr_channels; i++) {
1080 //                              struct rchan *rchan = trace->channels[i].trans_channel_data;
1081 //                              int fd;
1082 //
1083 //                              if(!strcmp(trace->channels[i].channel_name, channel_name)) {
1084 //                                      struct rchan_buf *rbuf = rchan->buf;
1085 //                                      struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
1086 //
1087 //                                      result = fd = ustcomm_app_detach_client(&ustcomm_app, &src);
1088 //                                      if(result == -1) {
1089 //                                              ERR("ustcomm_app_detach_client failed");
1090 //                                              goto next_cmd;
1091 //                                      }
1092 //
1093 //                                      lttbuf->wake_consumer_arg = (void *) fd;
1094 //
1095 //                                      smp_wmb();
1096 //
1097 //                                      lttbuf->call_wake_consumer = 1;
1098 //
1099 //                                      break;
1100 //                              }
1101 //                      }
1102 //
1103 //                      free(channel_name);
1104 //              }
1105                 else {
1106                         ERR("unable to parse message: %s", recvbuf);
1107                 }
1108
1109         next_cmd:
1110                 free(recvbuf);
1111         }
1112 }
1113
1114 volatile sig_atomic_t have_listener = 0;
1115
1116 void create_listener(void)
1117 {
1118 #ifdef USE_CLONE
1119         static char listener_stack[16384];
1120         int result;
1121 #else
1122         pthread_t thread;
1123 #endif
1124
1125         if(have_listener) {
1126                 WARN("not creating listener because we already had one");
1127                 return;
1128         }
1129
1130 #ifdef USE_CLONE
1131         result = clone((int (*)(void *)) listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
1132         if(result == -1) {
1133                 perror("clone");
1134                 return;
1135         }
1136 #else
1137
1138         pthread_create(&thread, NULL, listener_main, NULL);
1139 #endif
1140
1141         have_listener = 1;
1142 }
1143
1144 static int init_socket(void)
1145 {
1146         return ustcomm_init_app(getpid(), &ustcomm_app);
1147 }
1148
1149 #define AUTOPROBE_DISABLED      0
1150 #define AUTOPROBE_ENABLE_ALL    1
1151 #define AUTOPROBE_ENABLE_REGEX  2
1152 static int autoprobe_method = AUTOPROBE_DISABLED;
1153 static regex_t autoprobe_regex;
1154
1155 static void auto_probe_connect(struct marker *m)
1156 {
1157         int result;
1158
1159         char* concat_name = NULL;
1160         const char *probe_name = "default";
1161
1162         if(autoprobe_method == AUTOPROBE_DISABLED) {
1163                 return;
1164         }
1165         else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) {
1166                 result = asprintf(&concat_name, "%s/%s", m->channel, m->name);
1167                 if(result == -1) {
1168                         ERR("auto_probe_connect: asprintf failed (marker %s/%s)",
1169                                 m->channel, m->name);
1170                         return;
1171                 }
1172                 if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) {
1173                         free(concat_name);
1174                         return;
1175                 }
1176                 free(concat_name);
1177         }
1178
1179         result = ltt_marker_connect(m->channel, m->name, probe_name);
1180         if(result && result != -EEXIST)
1181                 ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result);
1182
1183         DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name);
1184
1185 }
1186
1187 static void __attribute__((constructor)) init()
1188 {
1189         int result;
1190         char* autoprobe_val = NULL;
1191
1192         /* Assign the pidunique, to be able to differentiate the processes with same
1193          * pid, (before and after an exec).
1194          */
1195         pidunique = make_pidunique();
1196
1197         /* Initialize RCU in case the constructor order is not good. */
1198         rcu_init();
1199
1200         /* It is important to do this before events start to be generated. */
1201         ust_register_thread();
1202
1203         DBG("Tracectl constructor");
1204
1205         /* Must create socket before signal handler to prevent races.
1206          */
1207         result = init_socket();
1208         if(result == -1) {
1209                 ERR("init_socket error");
1210                 return;
1211         }
1212
1213         create_listener();
1214
1215         autoprobe_val = getenv("UST_AUTOPROBE");
1216         if(autoprobe_val) {
1217                 struct marker_iter iter;
1218
1219                 DBG("Autoprobe enabled.");
1220
1221                 /* Ensure markers are initialized */
1222                 //init_markers();
1223
1224                 /* Ensure marker control is initialized, for the probe */
1225                 init_marker_control();
1226
1227                 /* first, set the callback that will connect the
1228                  * probe on new markers
1229                  */
1230                 if(autoprobe_val[0] == '/') {
1231                         result = regcomp(&autoprobe_regex, autoprobe_val+1, 0);
1232                         if (result) {
1233                                 char regexerr[150];
1234
1235                                 regerror(result, &autoprobe_regex, regexerr, sizeof(regexerr));
1236                                 ERR("cannot parse regex %s (%s), will ignore UST_AUTOPROBE", autoprobe_val, regexerr);
1237                                 /* don't crash the application just for this */
1238                         }
1239                         else {
1240                                 autoprobe_method = AUTOPROBE_ENABLE_REGEX;
1241                         }
1242                 }
1243                 else {
1244                         /* just enable all instrumentation */
1245                         autoprobe_method = AUTOPROBE_ENABLE_ALL;
1246                 }
1247
1248                 marker_set_new_marker_cb(auto_probe_connect);
1249
1250                 /* Now, connect the probes that were already registered. */
1251                 marker_iter_reset(&iter);
1252                 marker_iter_start(&iter);
1253
1254                 DBG("now iterating on markers already registered");
1255                 while(iter.marker) {
1256                         DBG("now iterating on marker %s", iter.marker->name);
1257                         auto_probe_connect(iter.marker);
1258                         marker_iter_next(&iter);
1259                 }
1260         }
1261
1262         if(getenv("UST_TRACE")) {
1263                 char trace_name[] = "auto";
1264                 char trace_type[] = "ustrelay";
1265
1266                 DBG("starting early tracing");
1267
1268                 /* Ensure marker control is initialized */
1269                 init_marker_control();
1270
1271                 /* Ensure markers are initialized */
1272                 init_markers();
1273
1274                 /* Ensure buffers are initialized, for the transport to be available.
1275                  * We are about to set a trace type and it will fail without this.
1276                  */
1277                 init_ustrelay_transport();
1278
1279                 /* FIXME: When starting early tracing (here), depending on the
1280                  * order of constructors, it is very well possible some marker
1281                  * sections are not yet registered. Because of this, some
1282                  * channels may not be registered. Yet, we are about to ask the
1283                  * daemon to collect the channels. Channels which are not yet
1284                  * registered will not be collected.
1285                  *
1286                  * Currently, in LTTng, there is no way to add a channel after
1287                  * trace start. The reason for this is that it induces complex
1288                  * concurrency issues on the trace structures, which can only
1289                  * be resolved using RCU. This has not been done yet. As a
1290                  * workaround, we are forcing the registration of the "ust"
1291                  * channel here. This is the only channel (apart from metadata)
1292                  * that can be reliably used in early tracing.
1293                  *
1294                  * Non-early tracing does not have this problem and can use
1295                  * arbitrary channel names.
1296                  */
1297                 ltt_channels_register("ust");
1298
1299                 result = ltt_trace_setup(trace_name);
1300                 if(result < 0) {
1301                         ERR("ltt_trace_setup failed");
1302                         return;
1303                 }
1304
1305                 result = ltt_trace_set_type(trace_name, trace_type);
1306                 if(result < 0) {
1307                         ERR("ltt_trace_set_type failed");
1308                         return;
1309                 }
1310
1311                 result = ltt_trace_alloc(trace_name);
1312                 if(result < 0) {
1313                         ERR("ltt_trace_alloc failed");
1314                         return;
1315                 }
1316
1317                 result = ltt_trace_start(trace_name);
1318                 if(result < 0) {
1319                         ERR("ltt_trace_start failed");
1320                         return;
1321                 }
1322
1323                 /* Do this after the trace is started in order to avoid creating confusion
1324                  * if the trace fails to start. */
1325                 inform_consumer_daemon(trace_name);
1326         }
1327
1328
1329         return;
1330
1331         /* should decrementally destroy stuff if error */
1332
1333 }
1334
1335 /* This is only called if we terminate normally, not with an unhandled signal,
1336  * so we cannot rely on it. However, for now, LTTV requires that the header of
1337  * the last sub-buffer contain a valid end time for the trace. This is done
1338  * automatically only when the trace is properly stopped.
1339  *
1340  * If the traced program crashed, it is always possible to manually add the
1341  * right value in the header, or to open the trace in text mode.
1342  *
1343  * FIXME: Fix LTTV so it doesn't need this.
1344  */
1345
1346 static void destroy_traces(void)
1347 {
1348         int result;
1349
1350         /* if trace running, finish it */
1351
1352         DBG("destructor stopping traces");
1353
1354         result = ltt_trace_stop("auto");
1355         if(result == -1) {
1356                 ERR("ltt_trace_stop error");
1357         }
1358
1359         result = ltt_trace_destroy("auto");
1360         if(result == -1) {
1361                 ERR("ltt_trace_destroy error");
1362         }
1363 }
1364
1365 static int trace_recording(void)
1366 {
1367         int retval = 0;
1368         struct ust_trace *trace;
1369
1370         ltt_lock_traces();
1371
1372         list_for_each_entry(trace, &ltt_traces.head, list) {
1373                 if(trace->active) {
1374                         retval = 1;
1375                         break;
1376                 }
1377         }
1378
1379         ltt_unlock_traces();
1380
1381         return retval;
1382 }
1383
1384 #if 0
1385 static int have_consumer(void)
1386 {
1387         return !list_empty(&blocked_consumers);
1388 }
1389 #endif
1390
1391 int restarting_usleep(useconds_t usecs)
1392 {
1393         struct timespec tv;
1394         int result;
1395
1396         tv.tv_sec = 0;
1397         tv.tv_nsec = usecs * 1000;
1398
1399         do {
1400                 result = nanosleep(&tv, &tv);
1401         } while(result == -1 && errno == EINTR);
1402
1403         return result;
1404 }
1405
1406 /* This destructor keeps the process alive for a few seconds in order
1407  * to leave time to ustd to connect to its buffers. This is necessary
1408  * for programs whose execution is very short. It is also useful in all
1409  * programs when tracing is started close to the end of the program
1410  * execution.
1411  *
1412  * FIXME: For now, this only works for the first trace created in a
1413  * process.
1414  */
1415
1416 static void __attribute__((destructor)) keepalive()
1417 {
1418         if(trace_recording() && buffers_to_export) {
1419                 int total = 0;
1420                 DBG("Keeping process alive for consumer daemon...");
1421                 while(buffers_to_export) {
1422                         const int interv = 200000;
1423                         restarting_usleep(interv);
1424                         total += interv;
1425
1426                         if(total >= 3000000) {
1427                                 WARN("non-consumed buffers remaining after wait limit; not waiting anymore");
1428                                 break;
1429                         }
1430                 }
1431                 DBG("Finally dying...");
1432         }
1433
1434         destroy_traces();
1435
1436         ustcomm_fini_app(&ustcomm_app);
1437 }
1438
1439 void ust_potential_exec(void)
1440 {
1441         trace_mark(ust, potential_exec, MARK_NOARGS);
1442
1443         DBG("test");
1444
1445         keepalive();
1446 }
1447
1448 /* Notify ust that there was a fork. This needs to be called inside
1449  * the new process, anytime a process whose memory is not shared with
1450  * the parent is created. If this function is not called, the events
1451  * of the new process will not be collected.
1452  *
1453  * Signals should be disabled before the fork and reenabled only after
1454  * this call in order to guarantee tracing is not started before ust_fork()
1455  * sanitizes the new process.
1456  */
1457
1458 static void ust_fork(void)
1459 {
1460         struct blocked_consumer *bc;
1461         struct blocked_consumer *deletable_bc = NULL;
1462         int result;
1463
1464         DBG("ust: forking");
1465         ltt_trace_stop("auto");
1466         ltt_trace_destroy("auto");
1467         /* Delete all active connections */
1468         ustcomm_close_all_connections(&ustcomm_app.server);
1469
1470         /* Delete all blocked consumers */
1471         list_for_each_entry(bc, &blocked_consumers, list) {
1472                 close(bc->fd_producer);
1473                 close(bc->fd_consumer);
1474                 free(deletable_bc);
1475                 deletable_bc = bc;
1476                 list_del(&bc->list);
1477         }
1478
1479         have_listener = 0;
1480         create_listener();
1481         init_socket();
1482         ltt_trace_setup("auto");
1483         result = ltt_trace_set_type("auto", "ustrelay");
1484         if(result < 0) {
1485                 ERR("ltt_trace_set_type failed");
1486                 return;
1487         }
1488
1489         ltt_trace_alloc("auto");
1490         ltt_trace_start("auto");
1491         inform_consumer_daemon("auto");
1492 }
1493
1494 void ust_before_fork(ust_fork_info_t *fork_info)
1495 {
1496         /* Disable signals. This is to avoid that the child
1497          * intervenes before it is properly setup for tracing. It is
1498          * safer to disable all signals, because then we know we are not
1499          * breaking anything by restoring the original mask.
1500          */
1501         sigset_t all_sigs;
1502         int result;
1503
1504         /* FIXME:
1505                 - only do this if tracing is active
1506         */
1507
1508         /* Disable signals */
1509         sigfillset(&all_sigs);
1510         result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs);
1511         if(result == -1) {
1512                 PERROR("sigprocmask");
1513                 return;
1514         }
1515 }
1516
1517 /* Don't call this function directly in a traced program */
1518 static void ust_after_fork_common(ust_fork_info_t *fork_info)
1519 {
1520         int result;
1521
1522         /* Restore signals */
1523         result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL);
1524         if(result == -1) {
1525                 PERROR("sigprocmask");
1526                 return;
1527         }
1528 }
1529
1530 void ust_after_fork_parent(ust_fork_info_t *fork_info)
1531 {
1532         /* Reenable signals */
1533         ust_after_fork_common(fork_info);
1534 }
1535
1536 void ust_after_fork_child(ust_fork_info_t *fork_info)
1537 {
1538         /* First sanitize the child */
1539         ust_fork();
1540
1541         /* Then reenable interrupts */
1542         ust_after_fork_common(fork_info);
1543 }
1544