libust/tracectl.c

   1 /* Copyright (C) 2009  Pierre-Marc Fournier
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stdint.h>
  22 #include <signal.h>
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <sys/un.h>
  26 #include <sched.h>
  27 #include <fcntl.h>
  28 #include <poll.h>
  29 #include <regex.h>
  30 #include <urcu/uatomic_arch.h>
  31
  32 #include <ust/marker.h>
  33 #include <ust/tracectl.h>
  34 #include "tracer.h"
  35 #include "usterr.h"
  36 #include "ustcomm.h"
  37 #include "buffers.h"
  38 #include "marker-control.h"
  39
  40 //#define USE_CLONE
  41
  42 #define USTSIGNAL SIGIO
  43
  44 #define MAX_MSG_SIZE (100)
  45 #define MSG_NOTIF 1
  46 #define MSG_REGISTER_NOTIF 2
  47
  48 char consumer_stack[10000];
  49
  50 /* This should only be accessed by the constructor, before the creation
  51  * of the listener, and then only by the listener.
  52  */
  53 s64 pidunique = -1LL;
  54
  55 struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers);
  56
  57 static struct ustcomm_app ustcomm_app;
  58
  59 struct tracecmd { /* no padding */
  60         uint32_t size;
  61         uint16_t command;
  62 };
  63
  64 /* volatile because shared between the listener and the main thread */
  65 volatile sig_atomic_t buffers_to_export = 0;
  66
  67 struct trctl_msg {
  68         /* size: the size of all the fields except size itself */
  69         uint32_t size;
  70         uint16_t type;
  71         /* Only the necessary part of the payload is transferred. It
  72          * may even be none of it.
  73          */
  74         char payload[94];
  75 };
  76
  77 struct consumer_channel {
  78         int fd;
  79         struct ltt_channel_struct *chan;
  80 };
  81
  82 struct blocked_consumer {
  83         int fd_consumer;
  84         int fd_producer;
  85         int tmp_poll_idx;
  86
  87         /* args to ustcomm_send_reply */
  88         struct ustcomm_server server;
  89         struct ustcomm_source src;
  90
  91         /* args to ust_buffers_get_subbuf */
  92         struct ust_buffer *buf;
  93
  94         struct list_head list;
  95 };
  96
  97 static long long make_pidunique(void)
  98 {
  99         s64 retval;
 100         struct timeval tv;
 101
 102         gettimeofday(&tv, NULL);
 103
 104         retval = tv.tv_sec;
 105         retval <<= 32;
 106         retval |= tv.tv_usec;
 107
 108         return retval;
 109 }
 110
 111 static void print_markers(FILE *fp)
 112 {
 113         struct marker_iter iter;
 114
 115         lock_markers();
 116         marker_iter_reset(&iter);
 117         marker_iter_start(&iter);
 118
 119         while(iter.marker) {
 120                 fprintf(fp, "marker: %s/%s %d \"%s\" %p\n", iter.marker->channel, iter.marker->name, (int)imv_read(iter.marker->state), iter.marker->format, iter.marker->location);
 121                 marker_iter_next(&iter);
 122         }
 123         unlock_markers();
 124 }
 125
 126 static int init_socket(void);
 127
 128 int fd_notif = -1;
 129 void notif_cb(void)
 130 {
 131         int result;
 132         struct trctl_msg msg;
 133
 134         /* FIXME: fd_notif should probably be protected by a spinlock */
 135
 136         if(fd_notif == -1)
 137                 return;
 138
 139         msg.type = MSG_NOTIF;
 140         msg.size = sizeof(msg.type);
 141
 142         /* FIXME: don't block here */
 143         result = write(fd_notif, &msg, msg.size+sizeof(msg.size));
 144         if(result == -1) {
 145                 PERROR("write");
 146                 return;
 147         }
 148 }
 149
 150 /* Ask the daemon to collect a trace called trace_name and being
 151  * produced by this pid.
 152  *
 153  * The trace must be at least allocated. (It can also be started.)
 154  * This is because _ltt_trace_find is used.
 155  */
 156
 157 static void inform_consumer_daemon(const char *trace_name)
 158 {
 159         int i,j;
 160         struct ust_trace *trace;
 161         pid_t pid = getpid();
 162         int result;
 163
 164         ltt_lock_traces();
 165
 166         trace = _ltt_trace_find(trace_name);
 167         if(trace == NULL) {
 168                 WARN("inform_consumer_daemon: could not find trace \"%s\"; it is probably already destroyed", trace_name);
 169                 goto finish;
 170         }
 171
 172         for(i=0; i < trace->nr_channels; i++) {
 173                 /* iterate on all cpus */
 174                 for(j=0; j<trace->channels[i].n_cpus; j++) {
 175                         char *buf;
 176                         asprintf(&buf, "%s_%d", trace->channels[i].channel_name, j);
 177                         result = ustcomm_request_consumer(pid, buf);
 178                         if(result == -1) {
 179                                 WARN("Failed to request collection for channel %s. Is the daemon available?", trace->channels[i].channel_name);
 180                                 /* continue even if fail */
 181                         }
 182                         free(buf);
 183                         buffers_to_export++;
 184                 }
 185         }
 186
 187         finish:
 188         ltt_unlock_traces();
 189 }
 190
 191 void process_blocked_consumers(void)
 192 {
 193         int n_fds = 0;
 194         struct pollfd *fds;
 195         struct blocked_consumer *bc;
 196         int idx = 0;
 197         char inbuf;
 198         int result;
 199
 200         list_for_each_entry(bc, &blocked_consumers, list) {
 201                 n_fds++;
 202         }
 203
 204         fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd));
 205         if(fds == NULL) {
 206                 ERR("malloc returned NULL");
 207                 return;
 208         }
 209
 210         list_for_each_entry(bc, &blocked_consumers, list) {
 211                 fds[idx].fd = bc->fd_producer;
 212                 fds[idx].events = POLLIN;
 213                 bc->tmp_poll_idx = idx;
 214                 idx++;
 215         }
 216
 217         while((result = poll(fds, n_fds, 0)) == -1 && errno == EINTR)
 218                 /* nothing */;
 219         if(result == -1) {
 220                 PERROR("poll");
 221                 return;
 222         }
 223
 224         list_for_each_entry(bc, &blocked_consumers, list) {
 225                 if(fds[bc->tmp_poll_idx].revents) {
 226                         long consumed_old = 0;
 227                         char *reply;
 228
 229                         result = read(bc->fd_producer, &inbuf, 1);
 230                         if(result == -1) {
 231                                 PERROR("read");
 232                                 continue;
 233                         }
 234                         if(result == 0) {
 235                                 int res;
 236                                 DBG("PRODUCER END");
 237
 238                                 res = close(bc->fd_producer);
 239                                 if(res == -1) {
 240                                         PERROR("close");
 241                                 }
 242
 243                                 list_del(&bc->list);
 244
 245                                 result = ustcomm_send_reply(&bc->server, "END", &bc->src);
 246                                 if(result < 0) {
 247                                         ERR("ustcomm_send_reply failed");
 248                                         continue;
 249                                 }
 250
 251                                 continue;
 252                         }
 253
 254                         result = ust_buffers_get_subbuf(bc->buf, &consumed_old);
 255                         if(result == -EAGAIN) {
 256                                 WARN("missed buffer?");
 257                                 continue;
 258                         }
 259                         else if(result < 0) {
 260                                 DBG("ust_buffers_get_subbuf: error: %s", strerror(-result));
 261                         }
 262                         asprintf(&reply, "%s %ld", "OK", consumed_old);
 263                         result = ustcomm_send_reply(&bc->server, reply, &bc->src);
 264                         if(result < 0) {
 265                                 ERR("ustcomm_send_reply failed");
 266                                 free(reply);
 267                                 continue;
 268                         }
 269                         free(reply);
 270
 271                         list_del(&bc->list);
 272                 }
 273         }
 274
 275 }
 276
 277 void seperate_channel_cpu(const char *channel_and_cpu, char **channel, int *cpu)
 278 {
 279         const char *sep;
 280
 281         sep = rindex(channel_and_cpu, '_');
 282         if(sep == NULL) {
 283                 *cpu = -1;
 284                 sep = channel_and_cpu + strlen(channel_and_cpu);
 285         }
 286         else {
 287                 *cpu = atoi(sep+1);
 288         }
 289
 290         asprintf(channel, "%.*s", (int)(sep-channel_and_cpu), channel_and_cpu);
 291 }
 292
 293 static int do_cmd_get_shmid(const char *recvbuf, struct ustcomm_source *src)
 294 {
 295         int retval = 0;
 296         struct ust_trace *trace;
 297         char trace_name[] = "auto";
 298         int i;
 299         char *channel_and_cpu;
 300         int found = 0;
 301         int result;
 302         char *ch_name;
 303         int ch_cpu;
 304
 305         DBG("get_shmid");
 306
 307         channel_and_cpu = nth_token(recvbuf, 1);
 308         if(channel_and_cpu == NULL) {
 309                 ERR("cannot parse channel");
 310                 goto end;
 311         }
 312
 313         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 314         if(ch_cpu == -1) {
 315                 ERR("problem parsing channel name");
 316                 goto free_short_chan_name;
 317         }
 318
 319         ltt_lock_traces();
 320         trace = _ltt_trace_find(trace_name);
 321         ltt_unlock_traces();
 322
 323         if(trace == NULL) {
 324                 ERR("cannot find trace!");
 325                 retval = -1;
 326                 goto free_short_chan_name;
 327         }
 328
 329         for(i=0; i<trace->nr_channels; i++) {
 330                 struct ust_channel *channel = &trace->channels[i];
 331                 struct ust_buffer *buf = channel->buf[ch_cpu];
 332
 333                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 334                         char *reply;
 335
 336 //                      DBG("the shmid for the requested channel is %d", buf->shmid);
 337 //                      DBG("the shmid for its buffer structure is %d", channel->buf_struct_shmids);
 338                         asprintf(&reply, "%d %d", buf->shmid, channel->buf_struct_shmids[ch_cpu]);
 339
 340                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 341                         if(result) {
 342                                 ERR("ustcomm_send_reply failed");
 343                                 free(reply);
 344                                 retval = -1;
 345                                 goto free_short_chan_name;
 346                         }
 347
 348                         free(reply);
 349
 350                         found = 1;
 351                         break;
 352                 }
 353         }
 354
 355         if(!found) {
 356                 ERR("channel not found (%s)", channel_and_cpu);
 357         }
 358
 359         free_short_chan_name:
 360         free(ch_name);
 361
 362         end:
 363         return retval;
 364 }
 365
 366 static int do_cmd_get_n_subbufs(const char *recvbuf, struct ustcomm_source *src)
 367 {
 368         int retval = 0;
 369         struct ust_trace *trace;
 370         char trace_name[] = "auto";
 371         int i;
 372         char *channel_and_cpu;
 373         int found = 0;
 374         int result;
 375         char *ch_name;
 376         int ch_cpu;
 377
 378         DBG("get_n_subbufs");
 379
 380         channel_and_cpu = nth_token(recvbuf, 1);
 381         if(channel_and_cpu == NULL) {
 382                 ERR("cannot parse channel");
 383                 goto end;
 384         }
 385
 386         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 387         if(ch_cpu == -1) {
 388                 ERR("problem parsing channel name");
 389                 goto free_short_chan_name;
 390         }
 391
 392         ltt_lock_traces();
 393         trace = _ltt_trace_find(trace_name);
 394         ltt_unlock_traces();
 395
 396         if(trace == NULL) {
 397                 ERR("cannot find trace!");
 398                 retval = -1;
 399                 goto free_short_chan_name;
 400         }
 401
 402         for(i=0; i<trace->nr_channels; i++) {
 403                 struct ust_channel *channel = &trace->channels[i];
 404
 405                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 406                         char *reply;
 407
 408                         DBG("the n_subbufs for the requested channel is %d", channel->subbuf_cnt);
 409                         asprintf(&reply, "%d", channel->subbuf_cnt);
 410
 411                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 412                         if(result) {
 413                                 ERR("ustcomm_send_reply failed");
 414                                 free(reply);
 415                                 retval = -1;
 416                                 goto free_short_chan_name;
 417                         }
 418
 419                         free(reply);
 420                         found = 1;
 421                         break;
 422                 }
 423         }
 424         if(found == 0) {
 425                 ERR("unable to find channel");
 426         }
 427
 428         free_short_chan_name:
 429         free(ch_name);
 430
 431         end:
 432         return retval;
 433 }
 434
 435 static int do_cmd_get_subbuf_size(const char *recvbuf, struct ustcomm_source *src)
 436 {
 437         int retval = 0;
 438         struct ust_trace *trace;
 439         char trace_name[] = "auto";
 440         int i;
 441         char *channel_and_cpu;
 442         int found = 0;
 443         int result;
 444         char *ch_name;
 445         int ch_cpu;
 446
 447         DBG("get_subbuf_size");
 448
 449         channel_and_cpu = nth_token(recvbuf, 1);
 450         if(channel_and_cpu == NULL) {
 451                 ERR("cannot parse channel");
 452                 goto end;
 453         }
 454
 455         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 456         if(ch_cpu == -1) {
 457                 ERR("problem parsing channel name");
 458                 goto free_short_chan_name;
 459         }
 460
 461         ltt_lock_traces();
 462         trace = _ltt_trace_find(trace_name);
 463         ltt_unlock_traces();
 464
 465         if(trace == NULL) {
 466                 ERR("cannot find trace!");
 467                 retval = -1;
 468                 goto free_short_chan_name;
 469         }
 470
 471         for(i=0; i<trace->nr_channels; i++) {
 472                 struct ust_channel *channel = &trace->channels[i];
 473
 474                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 475                         char *reply;
 476
 477                         DBG("the subbuf_size for the requested channel is %zd", channel->subbuf_size);
 478                         asprintf(&reply, "%zd", channel->subbuf_size);
 479
 480                         result = ustcomm_send_reply(&ustcomm_app.server, reply, src);
 481                         if(result) {
 482                                 ERR("ustcomm_send_reply failed");
 483                                 free(reply);
 484                                 retval = -1;
 485                                 goto free_short_chan_name;
 486                         }
 487
 488                         free(reply);
 489                         found = 1;
 490                         break;
 491                 }
 492         }
 493         if(found == 0) {
 494                 ERR("unable to find channel");
 495         }
 496
 497         free_short_chan_name:
 498         free(ch_name);
 499
 500         end:
 501         return retval;
 502 }
 503
 504 static unsigned int poweroftwo(unsigned int x)
 505 {
 506     unsigned int power2 = 1;
 507     unsigned int hardcoded = 2147483648; /* FIX max 2^31 */
 508
 509     if (x < 2)
 510         return 2;
 511
 512     while (power2 < x && power2 < hardcoded)
 513         power2 *= 2;
 514
 515     return power2;
 516 }
 517
 518 static int do_cmd_set_subbuf_size(const char *recvbuf, struct ustcomm_source *src)
 519 {
 520         char *channel_slash_size;
 521         char ch_name[256]="";
 522         unsigned int size, power;
 523         int retval = 0;
 524         struct ust_trace *trace;
 525         char trace_name[] = "auto";
 526         int i;
 527         int found = 0;
 528
 529         DBG("set_subbuf_size");
 530
 531         channel_slash_size = nth_token(recvbuf, 1);
 532         sscanf(channel_slash_size, "%255[^/]/%u", ch_name, &size);
 533
 534         if(ch_name == NULL) {
 535                 ERR("cannot parse channel");
 536                 goto end;
 537         }
 538
 539         power = poweroftwo(size);
 540         if (power != size)
 541                 WARN("using the next 2^n = %u\n", power);
 542
 543         ltt_lock_traces();
 544         trace = _ltt_trace_find_setup(trace_name);
 545         if(trace == NULL) {
 546                 ERR("cannot find trace!");
 547                 retval = -1;
 548                 goto end;
 549         }
 550
 551         for(i = 0; i < trace->nr_channels; i++) {
 552                 struct ust_channel *channel = &trace->channels[i];
 553
 554                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 555
 556                         channel->subbuf_size = power;
 557                         DBG("the set_subbuf_size for the requested channel is %zd", channel->subbuf_size);
 558
 559                         found = 1;
 560                         break;
 561                 }
 562         }
 563         if(found == 0) {
 564                 ERR("unable to find channel");
 565         }
 566
 567         end:
 568         ltt_unlock_traces();
 569         return retval;
 570 }
 571
 572 static int do_cmd_set_subbuf_num(const char *recvbuf, struct ustcomm_source *src)
 573 {
 574         char *channel_slash_num;
 575         char ch_name[256]="";
 576         unsigned int num;
 577         int retval = 0;
 578         struct ust_trace *trace;
 579         char trace_name[] = "auto";
 580         int i;
 581         int found = 0;
 582
 583         DBG("set_subbuf_num");
 584
 585         channel_slash_num = nth_token(recvbuf, 1);
 586         sscanf(channel_slash_num, "%255[^/]/%u", ch_name, &num);
 587
 588         if(ch_name == NULL) {
 589                 ERR("cannot parse channel");
 590                 goto end;
 591         }
 592         if (num < 2) {
 593                 ERR("subbuffer count should be greater than 2");
 594                 goto end;
 595         }
 596
 597         ltt_lock_traces();
 598         trace = _ltt_trace_find_setup(trace_name);
 599         if(trace == NULL) {
 600                 ERR("cannot find trace!");
 601                 retval = -1;
 602                 goto end;
 603         }
 604
 605         for(i = 0; i < trace->nr_channels; i++) {
 606                 struct ust_channel *channel = &trace->channels[i];
 607
 608                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 609
 610                         channel->subbuf_cnt = num;
 611                         DBG("the set_subbuf_cnt for the requested channel is %zd", channel->subbuf_cnt);
 612
 613                         found = 1;
 614                         break;
 615                 }
 616         }
 617         if(found == 0) {
 618                 ERR("unable to find channel");
 619         }
 620
 621         end:
 622         ltt_unlock_traces();
 623         return retval;
 624 }
 625
 626 static int do_cmd_get_subbuffer(const char *recvbuf, struct ustcomm_source *src)
 627 {
 628         int retval = 0;
 629         struct ust_trace *trace;
 630         char trace_name[] = "auto";
 631         int i;
 632         char *channel_and_cpu;
 633         int found = 0;
 634         char *ch_name;
 635         int ch_cpu;
 636
 637         DBG("get_subbuf");
 638
 639         channel_and_cpu = nth_token(recvbuf, 1);
 640         if(channel_and_cpu == NULL) {
 641                 ERR("cannot parse channel");
 642                 goto end;
 643         }
 644
 645         seperate_channel_cpu(channel_and_cpu, &ch_name, &ch_cpu);
 646         if(ch_cpu == -1) {
 647                 ERR("problem parsing channel name");
 648                 goto free_short_chan_name;
 649         }
 650
 651         ltt_lock_traces();
 652         trace = _ltt_trace_find(trace_name);
 653
 654         if(trace == NULL) {
 655                 int result;
 656
 657                 DBG("Cannot find trace. It was likely destroyed by the user.");
 658                 result = ustcomm_send_reply(&ustcomm_app.server, "NOTFOUND", src);
 659                 if(result) {
 660                         ERR("ustcomm_send_reply failed");
 661                         retval = -1;
 662                         goto unlock_traces;
 663                 }
 664
 665                 goto unlock_traces;
 666         }
 667
 668         for(i=0; i<trace->nr_channels; i++) {
 669                 struct ust_channel *channel = &trace->channels[i];
 670
 671                 if(!strcmp(trace->channels[i].channel_name, ch_name)) {
 672                         struct ust_buffer *buf = channel->buf[ch_cpu];
 673                         struct blocked_consumer *bc;
 674
 675                         found = 1;
 676
 677                         bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer));
 678                         if(bc == NULL) {
 679                                 ERR("malloc returned NULL");
 680                                 goto unlock_traces;
 681                         }
 682                         bc->fd_consumer = src->fd;
 683                         bc->fd_producer = buf->data_ready_fd_read;
 684                         bc->buf = buf;
 685                         bc->src = *src;
 686                         bc->server = ustcomm_app.server;
 687
 688                         list_add(&bc->list, &blocked_consumers);
 689
 690                         /* Being here is the proof the daemon has mapped the buffer in its
 691                          * memory. We may now decrement buffers_to_export.
 692                          */
 693                         if(uatomic_read(&buf->consumed) == 0) {
 694                                 DBG("decrementing buffers_to_export");
 695                                 buffers_to_export--;
 696                         }
 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                 DBG("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 static void listener_cleanup(void *ptr)
 823 {
 824         ustcomm_fini_app(&ustcomm_app, 0);
 825 }
 826
 827 void *listener_main(void *p)
 828 {
 829         int result;
 830
 831         DBG("LISTENER");
 832
 833         pthread_cleanup_push(listener_cleanup, NULL);
 834
 835         for(;;) {
 836                 char trace_name[] = "auto";
 837                 char trace_type[] = "ustrelay";
 838                 char *recvbuf;
 839                 int len;
 840                 struct ustcomm_source src;
 841
 842                 process_blocked_consumers();
 843
 844                 result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5);
 845                 if(result < 0) {
 846                         WARN("error in ustcomm_app_recv_message");
 847                         continue;
 848                 }
 849                 else if(result == 0) {
 850                         /* no message */
 851                         continue;
 852                 }
 853
 854                 DBG("received a message! it's: %s", recvbuf);
 855                 len = strlen(recvbuf);
 856
 857                 if(!strcmp(recvbuf, "print_markers")) {
 858                         print_markers(stderr);
 859                 }
 860                 else if(!strcmp(recvbuf, "list_markers")) {
 861                         char *ptr;
 862                         size_t size;
 863                         FILE *fp;
 864
 865                         fp = open_memstream(&ptr, &size);
 866                         print_markers(fp);
 867                         fclose(fp);
 868
 869                         result = ustcomm_send_reply(&ustcomm_app.server, ptr, &src);
 870
 871                         free(ptr);
 872                 }
 873                 else if(!strcmp(recvbuf, "start")) {
 874                         /* start is an operation that setups the trace, allocates it and starts it */
 875                         result = ltt_trace_setup(trace_name);
 876                         if(result < 0) {
 877                                 ERR("ltt_trace_setup failed");
 878                                 return (void *)1;
 879                         }
 880
 881                         result = ltt_trace_set_type(trace_name, trace_type);
 882                         if(result < 0) {
 883                                 ERR("ltt_trace_set_type failed");
 884                                 return (void *)1;
 885                         }
 886
 887                         result = ltt_trace_alloc(trace_name);
 888                         if(result < 0) {
 889                                 ERR("ltt_trace_alloc failed");
 890                                 return (void *)1;
 891                         }
 892
 893                         inform_consumer_daemon(trace_name);
 894
 895                         result = ltt_trace_start(trace_name);
 896                         if(result < 0) {
 897                                 ERR("ltt_trace_start failed");
 898                                 continue;
 899                         }
 900                 }
 901                 else if(!strcmp(recvbuf, "trace_setup")) {
 902                         DBG("trace setup");
 903
 904                         result = ltt_trace_setup(trace_name);
 905                         if(result < 0) {
 906                                 ERR("ltt_trace_setup failed");
 907                                 return (void *)1;
 908                         }
 909
 910                         result = ltt_trace_set_type(trace_name, trace_type);
 911                         if(result < 0) {
 912                                 ERR("ltt_trace_set_type failed");
 913                                 return (void *)1;
 914                         }
 915                 }
 916                 else if(!strcmp(recvbuf, "trace_alloc")) {
 917                         DBG("trace alloc");
 918
 919                         result = ltt_trace_alloc(trace_name);
 920                         if(result < 0) {
 921                                 ERR("ltt_trace_alloc failed");
 922                                 return (void *)1;
 923                         }
 924                         inform_consumer_daemon(trace_name);
 925                 }
 926                 else if(!strcmp(recvbuf, "trace_create")) {
 927                         DBG("trace create");
 928
 929                         result = ltt_trace_setup(trace_name);
 930                         if(result < 0) {
 931                                 ERR("ltt_trace_setup failed");
 932                                 return (void *)1;
 933                         }
 934
 935                         result = ltt_trace_set_type(trace_name, trace_type);
 936                         if(result < 0) {
 937                                 ERR("ltt_trace_set_type failed");
 938                                 return (void *)1;
 939                         }
 940                 }
 941                 else if(!strcmp(recvbuf, "trace_start")) {
 942                         DBG("trace start");
 943
 944                         result = ltt_trace_alloc(trace_name);
 945                         if(result < 0) {
 946                                 ERR("ltt_trace_alloc failed");
 947                                 return (void *)1;
 948                         }
 949                         if(!result) {
 950                                 inform_consumer_daemon(trace_name);
 951                         }
 952
 953                         result = ltt_trace_start(trace_name);
 954                         if(result < 0) {
 955                                 ERR("ltt_trace_start failed");
 956                                 continue;
 957                         }
 958                 }
 959                 else if(!strcmp(recvbuf, "trace_stop")) {
 960                         DBG("trace stop");
 961
 962                         result = ltt_trace_stop(trace_name);
 963                         if(result < 0) {
 964                                 ERR("ltt_trace_stop failed");
 965                                 return (void *)1;
 966                         }
 967                 }
 968                 else if(!strcmp(recvbuf, "trace_destroy")) {
 969
 970                         DBG("trace destroy");
 971
 972                         result = ltt_trace_destroy(trace_name, 0);
 973                         if(result < 0) {
 974                                 ERR("ltt_trace_destroy failed");
 975                                 return (void *)1;
 976                         }
 977                 }
 978                 else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) {
 979                         do_cmd_get_shmid(recvbuf, &src);
 980                 }
 981                 else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) {
 982                         do_cmd_get_n_subbufs(recvbuf, &src);
 983                 }
 984                 else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) {
 985                         do_cmd_get_subbuf_size(recvbuf, &src);
 986                 }
 987                 else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) {
 988                         char *libfile;
 989
 990                         libfile = nth_token(recvbuf, 1);
 991
 992                         DBG("load_probe_lib loading %s", libfile);
 993
 994                         free(libfile);
 995                 }
 996                 else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) {
 997                         do_cmd_get_subbuffer(recvbuf, &src);
 998                 }
 999                 else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) {
1000                         do_cmd_put_subbuffer(recvbuf, &src);
1001                 }
1002                 else if(nth_token_is(recvbuf, "set_subbuf_size", 0) == 1) {
1003                         do_cmd_set_subbuf_size(recvbuf, &src);
1004                 }
1005                 else if(nth_token_is(recvbuf, "set_subbuf_num", 0) == 1) {
1006                         do_cmd_set_subbuf_num(recvbuf, &src);
1007                 }
1008                 else if(nth_token_is(recvbuf, "enable_marker", 0) == 1) {
1009                         char *channel_slash_name = nth_token(recvbuf, 1);
1010                         char channel_name[256]="";
1011                         char marker_name[256]="";
1012
1013                         result = sscanf(channel_slash_name, "%255[^/]/%255s", channel_name, marker_name);
1014
1015                         if(channel_name == NULL || marker_name == NULL) {
1016                                 WARN("invalid marker name");
1017                                 goto next_cmd;
1018                         }
1019
1020                         result = ltt_marker_connect(channel_name, marker_name, "default");
1021                         if(result < 0) {
1022                                 WARN("could not enable marker; channel=%s, name=%s", channel_name, marker_name);
1023                         }
1024                 }
1025                 else if(nth_token_is(recvbuf, "disable_marker", 0) == 1) {
1026                         char *channel_slash_name = nth_token(recvbuf, 1);
1027                         char *marker_name;
1028                         char *channel_name;
1029
1030                         result = sscanf(channel_slash_name, "%a[^/]/%as", &channel_name, &marker_name);
1031
1032                         if(marker_name == NULL) {
1033                         }
1034
1035                         result = ltt_marker_disconnect(channel_name, marker_name, "default");
1036                         if(result < 0) {
1037                                 WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name);
1038                         }
1039                 }
1040                 else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) {
1041                         char *reply;
1042
1043                         asprintf(&reply, "%lld", pidunique);
1044
1045                         result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
1046                         if(result) {
1047                                 ERR("listener: get_pidunique: ustcomm_send_reply failed");
1048                                 goto next_cmd;
1049                         }
1050
1051                         free(reply);
1052                 }
1053 //              else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) {
1054 //                      struct ust_trace *trace;
1055 //                      char trace_name[] = "auto";
1056 //                      int i;
1057 //                      char *channel_name;
1058 //
1059 //                      DBG("get_notifications");
1060 //
1061 //                      channel_name = strdup_malloc(nth_token(recvbuf, 1));
1062 //                      if(channel_name == NULL) {
1063 //                              ERR("put_subbuf_size: cannot parse channel");
1064 //                              goto next_cmd;
1065 //                      }
1066 //
1067 //                      ltt_lock_traces();
1068 //                      trace = _ltt_trace_find(trace_name);
1069 //                      ltt_unlock_traces();
1070 //
1071 //                      if(trace == NULL) {
1072 //                              ERR("cannot find trace!");
1073 //                              return (void *)1;
1074 //                      }
1075 //
1076 //                      for(i=0; i<trace->nr_channels; i++) {
1077 //                              struct rchan *rchan = trace->channels[i].trans_channel_data;
1078 //                              int fd;
1079 //
1080 //                              if(!strcmp(trace->channels[i].channel_name, channel_name)) {
1081 //                                      struct rchan_buf *rbuf = rchan->buf;
1082 //                                      struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
1083 //
1084 //                                      result = fd = ustcomm_app_detach_client(&ustcomm_app, &src);
1085 //                                      if(result == -1) {
1086 //                                              ERR("ustcomm_app_detach_client failed");
1087 //                                              goto next_cmd;
1088 //                                      }
1089 //
1090 //                                      lttbuf->wake_consumer_arg = (void *) fd;
1091 //
1092 //                                      smp_wmb();
1093 //
1094 //                                      lttbuf->call_wake_consumer = 1;
1095 //
1096 //                                      break;
1097 //                              }
1098 //                      }
1099 //
1100 //                      free(channel_name);
1101 //              }
1102                 else {
1103                         ERR("unable to parse message: %s", recvbuf);
1104                 }
1105
1106         next_cmd:
1107                 free(recvbuf);
1108         }
1109
1110         pthread_cleanup_pop(1);
1111 }
1112
1113 volatile sig_atomic_t have_listener = 0;
1114 #ifndef USE_CLONE
1115 static pthread_t listener_thread;
1116 #endif
1117
1118 void create_listener(void)
1119 {
1120 #ifdef USE_CLONE
1121         static char listener_stack[16384];
1122         int result;
1123 #endif
1124
1125         if(have_listener) {
1126                 WARN("not creating listener because we already had one");
1127                 return;
1128         }
1129
1130 #ifdef USE_CLONE
1131         result = clone((int (*)(void *)) listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
1132         if(result == -1) {
1133                 perror("clone");
1134                 return;
1135         }
1136 #else
1137
1138         pthread_create(&listener_thread, NULL, listener_main, NULL);
1139 #endif
1140
1141         have_listener = 1;
1142 }
1143
1144 static int init_socket(void)
1145 {
1146         return ustcomm_init_app(getpid(), &ustcomm_app);
1147 }
1148
1149 #define AUTOPROBE_DISABLED      0
1150 #define AUTOPROBE_ENABLE_ALL    1
1151 #define AUTOPROBE_ENABLE_REGEX  2
1152 static int autoprobe_method = AUTOPROBE_DISABLED;
1153 static regex_t autoprobe_regex;
1154
1155 static void auto_probe_connect(struct marker *m)
1156 {
1157         int result;
1158
1159         char* concat_name = NULL;
1160         const char *probe_name = "default";
1161
1162         if(autoprobe_method == AUTOPROBE_DISABLED) {
1163                 return;
1164         }
1165         else if(autoprobe_method == AUTOPROBE_ENABLE_REGEX) {
1166                 result = asprintf(&concat_name, "%s/%s", m->channel, m->name);
1167                 if(result == -1) {
1168                         ERR("auto_probe_connect: asprintf failed (marker %s/%s)",
1169                                 m->channel, m->name);
1170                         return;
1171                 }
1172                 if (regexec(&autoprobe_regex, concat_name, 0, NULL, 0)) {
1173                         free(concat_name);
1174                         return;
1175                 }
1176                 free(concat_name);
1177         }
1178
1179         result = ltt_marker_connect(m->channel, m->name, probe_name);
1180         if(result && result != -EEXIST)
1181                 ERR("ltt_marker_connect (marker = %s/%s, errno = %d)", m->channel, m->name, -result);
1182
1183         DBG("auto connected marker %s (addr: %p) %s to probe default", m->channel, m, m->name);
1184
1185 }
1186
1187 static void __attribute__((constructor)) init()
1188 {
1189         int result;
1190         char* autoprobe_val = NULL;
1191
1192         /* Assign the pidunique, to be able to differentiate the processes with same
1193          * pid, (before and after an exec).
1194          */
1195         pidunique = make_pidunique();
1196
1197         DBG("Tracectl constructor");
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", 0);
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 static void stop_listener()
1399 {
1400         int result;
1401
1402         result = pthread_cancel(listener_thread);
1403         if(result == -1) {
1404                 PERROR("pthread_cancel");
1405         }
1406         result = pthread_join(listener_thread, NULL);
1407         if(result == -1) {
1408                 PERROR("pthread_join");
1409         }
1410 }
1411
1412 /* This destructor keeps the process alive for a few seconds in order
1413  * to leave time to ustd to connect to its buffers. This is necessary
1414  * for programs whose execution is very short. It is also useful in all
1415  * programs when tracing is started close to the end of the program
1416  * execution.
1417  *
1418  * FIXME: For now, this only works for the first trace created in a
1419  * process.
1420  */
1421
1422 static void __attribute__((destructor)) keepalive()
1423 {
1424         if(trace_recording() && buffers_to_export) {
1425                 int total = 0;
1426                 DBG("Keeping process alive for consumer daemon...");
1427                 while(buffers_to_export) {
1428                         const int interv = 200000;
1429                         restarting_usleep(interv);
1430                         total += interv;
1431
1432                         if(total >= 3000000) {
1433                                 WARN("non-consumed buffers remaining after wait limit; not waiting anymore");
1434                                 break;
1435                         }
1436                 }
1437                 DBG("Finally dying...");
1438         }
1439
1440         destroy_traces();
1441
1442         /* Ask the listener to stop and clean up. */
1443         stop_listener();
1444 }
1445
1446 void ust_potential_exec(void)
1447 {
1448         trace_mark(ust, potential_exec, MARK_NOARGS);
1449
1450         DBG("test");
1451
1452         keepalive();
1453 }
1454
1455 /* Notify ust that there was a fork. This needs to be called inside
1456  * the new process, anytime a process whose memory is not shared with
1457  * the parent is created. If this function is not called, the events
1458  * of the new process will not be collected.
1459  *
1460  * Signals should be disabled before the fork and reenabled only after
1461  * this call in order to guarantee tracing is not started before ust_fork()
1462  * sanitizes the new process.
1463  */
1464
1465 static void ust_fork(void)
1466 {
1467         struct blocked_consumer *bc;
1468         struct blocked_consumer *deletable_bc = NULL;
1469         int result;
1470
1471         /* FIXME: technically, the locks could have been taken before the fork */
1472         DBG("ust: forking");
1473
1474         /* break lock if necessary */
1475         ltt_unlock_traces();
1476
1477         ltt_trace_stop("auto");
1478         ltt_trace_destroy("auto", 1);
1479         /* Delete all active connections */
1480         ustcomm_close_all_connections(&ustcomm_app.server);
1481
1482         /* Delete all blocked consumers */
1483         list_for_each_entry(bc, &blocked_consumers, list) {
1484                 close(bc->fd_producer);
1485                 close(bc->fd_consumer);
1486                 free(deletable_bc);
1487                 deletable_bc = bc;
1488                 list_del(&bc->list);
1489         }
1490
1491         /* free app, keeping socket file */
1492         ustcomm_fini_app(&ustcomm_app, 1);
1493
1494         buffers_to_export = 0;
1495         have_listener = 0;
1496         init_socket();
1497         create_listener();
1498         ltt_trace_setup("auto");
1499         result = ltt_trace_set_type("auto", "ustrelay");
1500         if(result < 0) {
1501                 ERR("ltt_trace_set_type failed");
1502                 return;
1503         }
1504
1505         ltt_trace_alloc("auto");
1506         ltt_trace_start("auto");
1507         inform_consumer_daemon("auto");
1508 }
1509
1510 void ust_before_fork(ust_fork_info_t *fork_info)
1511 {
1512         /* Disable signals. This is to avoid that the child
1513          * intervenes before it is properly setup for tracing. It is
1514          * safer to disable all signals, because then we know we are not
1515          * breaking anything by restoring the original mask.
1516          */
1517         sigset_t all_sigs;
1518         int result;
1519
1520         /* FIXME:
1521                 - only do this if tracing is active
1522         */
1523
1524         /* Disable signals */
1525         sigfillset(&all_sigs);
1526         result = sigprocmask(SIG_BLOCK, &all_sigs, &fork_info->orig_sigs);
1527         if(result == -1) {
1528                 PERROR("sigprocmask");
1529                 return;
1530         }
1531 }
1532
1533 /* Don't call this function directly in a traced program */
1534 static void ust_after_fork_common(ust_fork_info_t *fork_info)
1535 {
1536         int result;
1537
1538         /* Restore signals */
1539         result = sigprocmask(SIG_SETMASK, &fork_info->orig_sigs, NULL);
1540         if(result == -1) {
1541                 PERROR("sigprocmask");
1542                 return;
1543         }
1544 }
1545
1546 void ust_after_fork_parent(ust_fork_info_t *fork_info)
1547 {
1548         /* Reenable signals */
1549         ust_after_fork_common(fork_info);
1550 }
1551
1552 void ust_after_fork_child(ust_fork_info_t *fork_info)
1553 {
1554         /* First sanitize the child */
1555         ust_fork();
1556
1557         /* Then reenable interrupts */
1558         ust_after_fork_common(fork_info);
1559 }
1560