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