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