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