src/lttngtop.c

   1 /*
   2  * Copyright (C) 2011-2012 Julien Desfossez
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License Version 2 as
   6  * published by the Free Software Foundation;
   7  *
   8  * This program 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
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <config.h>
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <babeltrace/babeltrace.h>
  23 #include <babeltrace/ctf/events.h>
  24 #include <babeltrace/ctf/callbacks.h>
  25 #include <babeltrace/ctf/iterator.h>
  26 #include <fcntl.h>
  27 #include <pthread.h>
  28 #include <popt.h>
  29 #include <stdlib.h>
  30 #include <ftw.h>
  31 #include <dirent.h>
  32 #include <ctype.h>
  33 #include <sys/stat.h>
  34 #include <unistd.h>
  35 #include <string.h>
  36 #include <errno.h>
  37 #include <sys/types.h>
  38 #include <fts.h>
  39 #include <assert.h>
  40 #include <sys/mman.h>
  41 #include <lttng/lttng.h>
  42 #include <lttng/lttngtop-helper.h>
  43 #include <babeltrace/lttngtopmmappacketseek.h>
  44
  45 #include "lttngtoptypes.h"
  46 #include "cputop.h"
  47 #include "iostreamtop.h"
  48 #include "cursesdisplay.h"
  49 #include "common.h"
  50
  51 #define DEFAULT_FILE_ARRAY_SIZE 1
  52
  53 const char *opt_input_path;
  54 static int opt_textdump;
  55 static int opt_child;
  56
  57 int quit = 0;
  58
  59 struct lttngtop *copy;
  60 pthread_t display_thread;
  61 pthread_t timer_thread;
  62
  63 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  64 unsigned long last_display_update = 0;
  65
  66 /* list of FDs available for being read with snapshots */
  67 struct mmap_stream_list mmap_list;
  68 GPtrArray *lttng_consumer_stream_array;
  69 int sessiond_metadata, consumerd_metadata;
  70 struct lttng_consumer_local_data *ctx = NULL;
  71 /* list of snapshots currently not consumed */
  72 GPtrArray *available_snapshots;
  73 sem_t metadata_available;
  74 int reload_trace = 0;
  75
  76 int last_textdump_print_newline = 1;
  77
  78 enum {
  79         OPT_NONE = 0,
  80         OPT_HELP,
  81         OPT_TEXTDUMP,
  82         OPT_PID,
  83         OPT_CHILD,
  84         OPT_HOSTNAME,
  85         OPT_KPROBES,
  86 };
  87
  88 static struct poptOption long_options[] = {
  89         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  90         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  91         { "textdump", 't', POPT_ARG_NONE, NULL, OPT_TEXTDUMP, NULL, NULL },
  92         { "child", 'f', POPT_ARG_NONE, NULL, OPT_CHILD, NULL, NULL },
  93         { "pid", 'p', POPT_ARG_STRING, &opt_tid, OPT_PID, NULL, NULL },
  94         { "hostname", 'n', POPT_ARG_STRING, &opt_hostname, OPT_HOSTNAME, NULL, NULL },
  95         { "kprobes", 'k', POPT_ARG_STRING, &opt_kprobes, OPT_KPROBES, NULL, NULL },
  96         { NULL, 0, 0, NULL, 0, NULL, NULL },
  97 };
  98
  99 static void handle_textdump_sigterm(int signal)
 100 {
 101         quit = 1;
 102         lttng_destroy_session("test");
 103 }
 104
 105 void *refresh_thread(void *p)
 106 {
 107         struct mmap_stream *mmap_info;
 108
 109         while (1) {
 110                 if (quit) {
 111                         sem_post(&pause_sem);
 112                         sem_post(&timer);
 113                         sem_post(&end_trace_sem);
 114                         sem_post(&goodtodisplay);
 115                         sem_post(&goodtoupdate);
 116                         pthread_exit(0);
 117                 }
 118                 if (!opt_input_path) {
 119                         bt_list_for_each_entry(mmap_info, &mmap_list.head, list)
 120                                 helper_kernctl_buffer_flush(mmap_info->fd);
 121                 }
 122                 sem_wait(&pause_sem);
 123                 sem_post(&pause_sem);
 124                 sem_post(&timer);
 125                 sleep(refresh_display/NSEC_PER_SEC);
 126         }
 127 }
 128
 129 void *ncurses_display(void *p)
 130 {
 131         unsigned int current_display_index = 0;
 132
 133         sem_wait(&bootstrap);
 134         /*
 135          * Prevent the 1 second delay when we hit ESC
 136          */
 137         ESCDELAY = 0;
 138         init_ncurses();
 139
 140         while (1) {
 141                 sem_wait(&timer);
 142                 sem_wait(&goodtodisplay);
 143                 sem_wait(&pause_sem);
 144
 145                 if (quit) {
 146                         sem_post(&pause_sem);
 147                         sem_post(&timer);
 148                         reset_ncurses();
 149                         pthread_exit(0);
 150                 }
 151
 152                 copy = g_ptr_array_index(copies, current_display_index);
 153                 assert(copy);
 154                 display(current_display_index++);
 155
 156                 sem_post(&goodtoupdate);
 157                 sem_post(&pause_sem);
 158         }
 159 }
 160
 161 void print_fields(struct bt_ctf_event *event)
 162 {
 163         unsigned int cnt, i;
 164         const struct definition *const * list;
 165         const struct definition *scope;
 166         enum ctf_type_id type;
 167         const char *str;
 168
 169         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_FIELDS);
 170
 171         bt_ctf_get_field_list(event, scope, &list, &cnt);
 172         for (i = 0; i < cnt; i++) {
 173                 if (i != 0)
 174                         printf(", ");
 175                 printf("%s = ", bt_ctf_field_name(list[i]));
 176                 type = bt_ctf_field_type(list[i]);
 177                 if (type == CTF_TYPE_INTEGER) {
 178                         if (bt_ctf_get_int_signedness(list[i]) == 0)
 179                                 printf("%" PRIu64 "", bt_ctf_get_uint64(list[i]));
 180                         else
 181                                 printf("%" PRId64 "", bt_ctf_get_int64(list[i]));
 182                 } else if (type == CTF_TYPE_STRING) {
 183                         printf("%s", bt_ctf_get_string(list[i]));
 184                 } else if (type == CTF_TYPE_ARRAY) {
 185                         str = bt_ctf_get_char_array(list[i]);
 186                         if (!bt_ctf_field_get_error() && str)
 187                                 printf("%s", str);
 188                 }
 189         }
 190 }
 191
 192 /*
 193  * hook on each event to check the timestamp and refresh the display if
 194  * necessary
 195  */
 196 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
 197 {
 198         unsigned long timestamp;
 199         struct tm start;
 200         uint64_t ts_nsec_start;
 201         int pid, cpu_id;
 202         int64_t syscall_ret;
 203         const struct definition *scope;
 204         const char *hostname, *procname;
 205
 206         timestamp = bt_ctf_get_timestamp(call_data);
 207
 208         start = format_timestamp(timestamp);
 209         ts_nsec_start = timestamp % NSEC_PER_SEC;
 210
 211         pid = get_context_pid(call_data);
 212         if (pid == -1ULL && opt_tid) {
 213                 goto error;
 214         }
 215
 216         hostname = get_context_hostname(call_data);
 217         if (!opt_tid && (opt_hostname && !lookup_hostname_list(hostname)))
 218                 goto end;
 219         if (!opt_hostname && (opt_tid && !lookup_tid_list(pid)))
 220                 goto end;
 221         if ((opt_tid && !lookup_tid_list(pid)) &&
 222                         (opt_hostname && !lookup_hostname_list(hostname)))
 223                 goto end;
 224
 225         cpu_id = get_cpu_id(call_data);
 226         procname = get_context_comm(call_data);
 227
 228         if ((strcmp(bt_ctf_event_name(call_data), "exit_syscall") == 0) &&
 229                         !last_textdump_print_newline) {
 230                 scope = bt_ctf_get_top_level_scope(call_data,
 231                                 BT_EVENT_FIELDS);
 232                 syscall_ret = bt_ctf_get_int64(bt_ctf_get_field(call_data,
 233                                         scope, "_ret"));
 234                 printf("= %ld\n", syscall_ret);
 235                 last_textdump_print_newline = 1;
 236         } else {
 237                 /* we might have lost the exit_syscall event, so need to
 238                  * print the newline in this case */
 239                 if (last_textdump_print_newline == 0)
 240                         printf("\n");
 241                 printf("%02d:%02d:%02d.%09" PRIu64 " (%s) (cpu %d) [%s (%d)] %s (",
 242                                 start.tm_hour, start.tm_min, start.tm_sec,
 243                                 ts_nsec_start, hostname, cpu_id, procname, pid,
 244                                 bt_ctf_event_name(call_data));
 245                 print_fields(call_data);
 246                 printf(") ");
 247                 if (strncmp(bt_ctf_event_name(call_data), "sys_", 4) != 0) {
 248                         printf("\n");
 249                         last_textdump_print_newline = 1;
 250                 } else {
 251                         last_textdump_print_newline = 0;
 252                 }
 253         }
 254
 255 end:
 256         return BT_CB_OK;
 257 error:
 258         return BT_CB_ERROR_STOP;
 259 }
 260
 261 enum bt_cb_ret handle_kprobes(struct bt_ctf_event *call_data, void *private_data)
 262 {
 263         int i;
 264         struct kprobes *kprobe;
 265
 266         /* for kprobes */
 267         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
 268                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
 269                 if (strcmp(bt_ctf_event_name(call_data), kprobe->probe_name) == 0) {
 270                         kprobe->count++;
 271                 }
 272         }
 273
 274         return BT_CB_OK;
 275 }
 276
 277 /*
 278  * hook on each event to check the timestamp and refresh the display if
 279  * necessary
 280  */
 281 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 282 {
 283         unsigned long timestamp;
 284
 285         timestamp = bt_ctf_get_timestamp(call_data);
 286         if (timestamp == -1ULL)
 287                 goto error;
 288
 289         if (last_display_update == 0)
 290                 last_display_update = timestamp;
 291
 292         if (timestamp - last_display_update >= refresh_display) {
 293                 sem_wait(&goodtoupdate);
 294                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 295                                         timestamp));
 296                 sem_post(&goodtodisplay);
 297                 sem_post(&bootstrap);
 298                 last_display_update = timestamp;
 299         }
 300         return BT_CB_OK;
 301
 302 error:
 303         fprintf(stderr, "check_timestamp callback error\n");
 304         return BT_CB_ERROR_STOP;
 305 }
 306
 307 /*
 308  * get_perf_counter : get or create and return a perf_counter struct for
 309  * either a process or a cpu (only one of the 2 parameters mandatory)
 310  */
 311 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 312                 struct cputime *cpu)
 313 {
 314         struct perfcounter *ret;
 315         GHashTable *table;
 316
 317         if (proc)
 318                 table = proc->perf;
 319         else if (cpu)
 320                 table = cpu->perf;
 321         else
 322                 goto error;
 323
 324         ret = g_hash_table_lookup(table, (gpointer) name);
 325         if (ret)
 326                 goto end;
 327
 328         ret = g_new0(struct perfcounter, 1);
 329         /* by default, make it visible in the UI */
 330         ret->visible = 1;
 331         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 332
 333 end:
 334         return ret;
 335
 336 error:
 337         return NULL;
 338 }
 339
 340 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 341                 const char *name, int value)
 342 {
 343         struct perfcounter *cpu_perf, *process_perf;
 344
 345         cpu_perf = get_perf_counter(name, NULL, cpu);
 346         if (cpu_perf->count < value) {
 347                 process_perf = get_perf_counter(name, proc, NULL);
 348                 process_perf->count += value - cpu_perf->count;
 349                 cpu_perf->count = value;
 350         }
 351 }
 352
 353 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 354                 const struct bt_definition *scope,
 355                 struct processtop *proc,
 356                 struct cputime *cpu)
 357 {
 358         struct bt_definition const * const *list = NULL;
 359         const struct bt_definition *field;
 360         unsigned int count;
 361         struct perfcounter *perfcounter;
 362         GHashTableIter iter;
 363         gpointer key;
 364         int ret;
 365
 366         if (!scope)
 367                 goto end;
 368
 369         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 370         if (ret < 0)
 371                 goto end;
 372
 373         if (count == 0)
 374                 goto end;
 375
 376         g_hash_table_iter_init(&iter, global_perf_liszt);
 377         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 378                 field = bt_ctf_get_field(event, scope, (char *) key);
 379                 if (field) {
 380                         int value = bt_ctf_get_uint64(field);
 381                         if (bt_ctf_field_get_error())
 382                                 continue;
 383                         update_perf_value(proc, cpu, (char *) key, value);
 384                 }
 385         }
 386
 387 end:
 388         return;
 389 }
 390
 391 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 392 {
 393         struct cputime *cpu;
 394         const struct bt_definition *scope;
 395
 396         cpu = get_cpu(get_cpu_id(event));
 397
 398         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 399         extract_perf_counter_scope(event, scope, proc, cpu);
 400
 401         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 402         extract_perf_counter_scope(event, scope, proc, cpu);
 403
 404         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 405         extract_perf_counter_scope(event, scope, proc, cpu);
 406 }
 407
 408 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 409                 void *private_data)
 410 {
 411         int pid, tid, ppid, vpid, vtid, vppid;
 412         char *comm, *hostname;
 413         struct processtop *parent, *child;
 414         unsigned long timestamp;
 415
 416         timestamp = bt_ctf_get_timestamp(call_data);
 417         if (timestamp == -1ULL)
 418                 goto error;
 419
 420         pid = get_context_pid(call_data);
 421         if (pid == -1ULL) {
 422                 goto error;
 423         }
 424
 425         tid = get_context_tid(call_data);
 426         if (tid == -1ULL) {
 427                 goto error;
 428         }
 429         ppid = get_context_ppid(call_data);
 430         if (ppid == -1ULL) {
 431                 goto error;
 432         }
 433         vpid = get_context_vpid(call_data);
 434         if (pid == -1ULL) {
 435                 vpid = -1;
 436         }
 437         vtid = get_context_vtid(call_data);
 438         if (tid == -1ULL) {
 439                 vtid = -1;
 440         }
 441         vppid = get_context_vppid(call_data);
 442         if (ppid == -1ULL) {
 443                 vppid = -1;
 444         }
 445         comm = get_context_comm(call_data);
 446         if (!comm) {
 447                 goto error;
 448         }
 449         /* optional */
 450         hostname = get_context_hostname(call_data);
 451
 452         /* find or create the current process */
 453         child = find_process_tid(&lttngtop, tid, comm);
 454         if (!child)
 455                 child = add_proc(&lttngtop, tid, comm, timestamp);
 456         if (!child)
 457                 goto end;
 458         update_proc(child, pid, tid, ppid, vpid, vtid, vppid, comm, hostname);
 459
 460         if (pid != tid) {
 461                 /* find or create the parent */
 462                 parent = find_process_tid(&lttngtop, pid, comm);
 463                 if (!parent) {
 464                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 465                         if (parent)
 466                                 parent->pid = pid;
 467                 }
 468
 469                 /* attach the parent to the current process */
 470                 child->threadparent = parent;
 471                 add_thread(parent, child);
 472         }
 473
 474         update_perf_counter(child, call_data);
 475
 476 end:
 477         return BT_CB_OK;
 478
 479 error:
 480         return BT_CB_ERROR_STOP;
 481 }
 482
 483 void init_lttngtop()
 484 {
 485         copies = g_ptr_array_new();
 486         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 487
 488         sem_init(&goodtodisplay, 0, 0);
 489         sem_init(&goodtoupdate, 0, 1);
 490         sem_init(&timer, 0, 1);
 491         sem_init(&bootstrap, 0, 0);
 492         sem_init(&pause_sem, 0, 1);
 493         sem_init(&end_trace_sem, 0, 0);
 494
 495         reset_global_counters();
 496         lttngtop.nbproc = 0;
 497         lttngtop.nbthreads = 0;
 498         lttngtop.nbfiles = 0;
 499
 500         lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
 501                         g_direct_equal);
 502         lttngtop.process_table = g_ptr_array_new();
 503         lttngtop.files_table = g_ptr_array_new();
 504         lttngtop.cpu_table = g_ptr_array_new();
 505 }
 506
 507 void usage(FILE *fp)
 508 {
 509         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 510         fprintf(fp, "Usage : lttngtop [OPTIONS] [TRACE]\n");
 511         fprintf(fp, "  TRACE                    Path to the trace to analyse (no trace path for live tracing)\n");
 512         fprintf(fp, "  -h, --help               This help message\n");
 513         fprintf(fp, "  -t, --textdump           Display live events in text-only\n");
 514         fprintf(fp, "  -p, --pid                Comma-separated list of PIDs to display\n");
 515         fprintf(fp, "  -f, --child              Follow threads associated with selected PIDs\n");
 516         fprintf(fp, "  -n, --hostname           Comma-separated list of hostnames to display (require hostname context in trace)\n");
 517 }
 518
 519 /*
 520  * Parse probe options.
 521  * Shamelessly stolen from lttng-tools :
 522  * src/bin/lttng/commands/enable_events.c
 523  */
 524 static struct kprobes *parse_probe_opts(char *opt)
 525 {
 526         char s_hex[19];
 527         char name[LTTNG_SYMBOL_NAME_LEN];
 528         struct kprobes *kprobe;
 529         int ret;
 530
 531         /*
 532         kprobe->probe_addr = 0;
 533         kprobe->probe_offset = 0;
 534         asprintf(&kprobe->probe_name, "probe_sys_open");
 535         asprintf(&kprobe->symbol_name, "sys_open");
 536         */
 537
 538         if (opt == NULL) {
 539                 kprobe = NULL;
 540                 goto end;
 541         }
 542
 543         kprobe = g_new0(struct kprobes, 1);
 544
 545         /* Check for symbol+offset */
 546         ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
 547         if (ret == 2) {
 548                 asprintf(&kprobe->probe_name, "probe_%s", name);
 549                 asprintf(&kprobe->symbol_name, "%s", name);
 550
 551                 if (strlen(s_hex) == 0) {
 552                         fprintf(stderr, "Invalid probe offset %s", s_hex);
 553                         ret = -1;
 554                         goto end;
 555                 }
 556                 kprobe->probe_offset = strtoul(s_hex, NULL, 0);
 557                 kprobe->probe_addr = 0;
 558                 goto end;
 559         }
 560
 561         /* Check for symbol */
 562         if (isalpha(name[0])) {
 563                 ret = sscanf(opt, "%s", name);
 564                 if (ret == 1) {
 565                         asprintf(&kprobe->probe_name, "probe_%s", name);
 566                         asprintf(&kprobe->symbol_name, "%s", name);
 567                         kprobe->probe_offset = 0;
 568                         kprobe->probe_addr = 0;
 569                         goto end;
 570                 }
 571         }
 572
 573         /* Check for address */
 574         ret = sscanf(opt, "%s", s_hex);
 575         if (ret > 0) {
 576                 if (strlen(s_hex) == 0) {
 577                         fprintf(stderr, "Invalid probe address %s", s_hex);
 578                         ret = -1;
 579                         goto end;
 580                 }
 581                 asprintf(&kprobe->probe_name, "probe_%s", s_hex);
 582                 kprobe->probe_offset = 0;
 583                 kprobe->probe_addr = strtoul(s_hex, NULL, 0);
 584                 goto end;
 585         }
 586
 587         /* No match */
 588         kprobe = NULL;
 589
 590 end:
 591         return kprobe;
 592 }
 593
 594 /*
 595  * Return 0 if caller should continue, < 0 if caller should return
 596  * error, > 0 if caller should exit without reporting error.
 597  */
 598 static int parse_options(int argc, char **argv)
 599 {
 600         poptContext pc;
 601         int opt, ret = 0;
 602         char *tmp_str;
 603         int *tid;
 604
 605         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 606         poptReadDefaultConfig(pc, 0);
 607
 608         while ((opt = poptGetNextOpt(pc)) != -1) {
 609                 switch (opt) {
 610                         case OPT_HELP:
 611                                 usage(stdout);
 612                                 ret = 1;    /* exit cleanly */
 613                                 goto end;
 614                         case OPT_TEXTDUMP:
 615                                 opt_textdump = 1;
 616                                 break;
 617                         case OPT_CHILD:
 618                                 opt_textdump = 1;
 619                                 opt_child = 1;
 620                                 break;
 621                         case OPT_PID:
 622                                 tid_list = g_hash_table_new(g_str_hash,
 623                                                 g_str_equal);
 624                                 tmp_str = strtok(opt_tid, ",");
 625                                 while (tmp_str) {
 626                                         tid = malloc(sizeof(int));
 627                                         *tid = atoi(tmp_str);
 628                                         g_hash_table_insert(tid_list,
 629                                                         (gpointer) tid, tid);
 630                                         tmp_str = strtok(NULL, ",");
 631                                 }
 632                                 break;
 633                         case OPT_HOSTNAME:
 634                                 hostname_list = g_hash_table_new(g_str_hash,
 635                                                 g_str_equal);
 636                                 tmp_str = strtok(opt_hostname, ",");
 637                                 while (tmp_str) {
 638                                         char *new_str = strdup(tmp_str);
 639                                         g_hash_table_insert(hostname_list,
 640                                                         (gpointer) new_str,
 641                                                         (gpointer) new_str);
 642                                         tmp_str = strtok(NULL, ",");
 643                                 }
 644                                 break;
 645                         case OPT_KPROBES:
 646                                 lttngtop.kprobes_table = g_ptr_array_new();
 647                                 tmp_str = strtok(opt_kprobes, ",");
 648                                 while (tmp_str) {
 649                                         struct kprobes *kprobe;
 650
 651                                         kprobe = parse_probe_opts(tmp_str);
 652                                         if (kprobe) {
 653                                                 g_ptr_array_add(
 654                                                         lttngtop.kprobes_table,
 655                                                         kprobe);
 656                                         } else {
 657                                                 ret = -EINVAL;
 658                                                 goto end;
 659                                         }
 660                                         tmp_str = strtok(NULL, ",");
 661                                 }
 662                                 break;
 663                         default:
 664                                 ret = -EINVAL;
 665                                 goto end;
 666                 }
 667         }
 668
 669         opt_input_path = poptGetArg(pc);
 670
 671 end:
 672         if (pc) {
 673                 poptFreeContext(pc);
 674         }
 675         return ret;
 676 }
 677
 678 void iter_trace(struct bt_context *bt_ctx)
 679 {
 680         struct bt_ctf_iter *iter;
 681         struct bt_iter_pos begin_pos;
 682         struct kprobes *kprobe;
 683         const struct bt_ctf_event *event;
 684         int i;
 685         int ret = 0;
 686
 687         begin_pos.type = BT_SEEK_BEGIN;
 688         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 689
 690         if (opt_textdump) {
 691                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 692                                 print_timestamp,
 693                                 NULL, NULL, NULL);
 694         } else {
 695                 /* at each event check if we need to refresh */
 696                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 697                                 check_timestamp,
 698                                 NULL, NULL, NULL);
 699                 /* at each event, verify the status of the process table */
 700                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 701                                 fix_process_table,
 702                                 NULL, NULL, NULL);
 703                 /* to handle the scheduling events */
 704                 bt_ctf_iter_add_callback(iter,
 705                                 g_quark_from_static_string("sched_switch"),
 706                                 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 707                 /* to clean up the process table */
 708                 bt_ctf_iter_add_callback(iter,
 709                                 g_quark_from_static_string("sched_process_free"),
 710                                 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 711                 /* to get all the process from the statedumps */
 712                 bt_ctf_iter_add_callback(iter,
 713                                 g_quark_from_static_string(
 714                                         "lttng_statedump_process_state"),
 715                                 NULL, 0, handle_statedump_process_state,
 716                                 NULL, NULL, NULL);
 717
 718                 /* for IO top */
 719                 bt_ctf_iter_add_callback(iter,
 720                                 g_quark_from_static_string("exit_syscall"),
 721                                 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 722                 bt_ctf_iter_add_callback(iter,
 723                                 g_quark_from_static_string("sys_write"),
 724                                 NULL, 0, handle_sys_write, NULL, NULL, NULL);
 725                 bt_ctf_iter_add_callback(iter,
 726                                 g_quark_from_static_string("sys_read"),
 727                                 NULL, 0, handle_sys_read, NULL, NULL, NULL);
 728                 bt_ctf_iter_add_callback(iter,
 729                                 g_quark_from_static_string("sys_open"),
 730                                 NULL, 0, handle_sys_open, NULL, NULL, NULL);
 731                 bt_ctf_iter_add_callback(iter,
 732                                 g_quark_from_static_string("sys_close"),
 733                                 NULL, 0, handle_sys_close, NULL, NULL, NULL);
 734                 bt_ctf_iter_add_callback(iter,
 735                                 g_quark_from_static_string(
 736                                         "lttng_statedump_file_descriptor"),
 737                                 NULL, 0, handle_statedump_file_descriptor,
 738                                 NULL, NULL, NULL);
 739
 740                 /* for kprobes */
 741                 for (i = 0; i < lttngtop.kprobes_table->len; i++) {
 742                         kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
 743                         bt_ctf_iter_add_callback(iter,
 744                                         g_quark_from_static_string(
 745                                                 kprobe->probe_name),
 746                                         NULL, 0, handle_kprobes,
 747                                         NULL, NULL, NULL);
 748                 }
 749         }
 750
 751         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 752                 if (quit || reload_trace)
 753                         goto end_iter;
 754                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 755                 if (ret < 0)
 756                         goto end_iter;
 757         }
 758
 759         /* block until quit, we reached the end of the trace */
 760         sem_wait(&end_trace_sem);
 761
 762 end_iter:
 763         bt_ctf_iter_destroy(iter);
 764 }
 765
 766 /*
 767  * bt_context_add_traces_recursive: Open a trace recursively
 768  * (copied from BSD code in converter/babeltrace.c)
 769  *
 770  * Find each trace present in the subdirectory starting from the given
 771  * path, and add them to the context. The packet_seek parameter can be
 772  * NULL: this specify to use the default format packet_seek.
 773  *
 774  * Return: 0 on success, nonzero on failure.
 775  * Unable to open toplevel: failure.
 776  * Unable to open some subdirectory or file: warn and continue;
 777  */
 778 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 779                 const char *format_str,
 780                 void (*packet_seek)(struct bt_stream_pos *pos,
 781                         size_t offset, int whence))
 782 {
 783         FTS *tree;
 784         FTSENT *node;
 785         GArray *trace_ids;
 786         char lpath[PATH_MAX];
 787         char * const paths[2] = { lpath, NULL };
 788         int ret = -1;
 789
 790         /*
 791          * Need to copy path, because fts_open can change it.
 792          * It is the pointer array, not the strings, that are constant.
 793          */
 794         strncpy(lpath, path, PATH_MAX);
 795         lpath[PATH_MAX - 1] = '\0';
 796
 797         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 798         if (tree == NULL) {
 799                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 800                                 path);
 801                 return -EINVAL;
 802         }
 803
 804         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 805
 806         while ((node = fts_read(tree))) {
 807                 int dirfd, metafd;
 808
 809                 if (!(node->fts_info & FTS_D))
 810                         continue;
 811
 812                 dirfd = open(node->fts_accpath, 0);
 813                 if (dirfd < 0) {
 814                         fprintf(stderr, "[error] [Context] Unable to open trace "
 815                                 "directory file descriptor.\n");
 816                         ret = dirfd;
 817                         goto error;
 818                 }
 819                 metafd = openat(dirfd, "metadata", O_RDONLY);
 820                 if (metafd < 0) {
 821                         close(dirfd);
 822                         ret = -1;
 823                         continue;
 824                 } else {
 825                         int trace_id;
 826
 827                         ret = close(metafd);
 828                         if (ret < 0) {
 829                                 perror("close");
 830                                 goto error;
 831                         }
 832                         ret = close(dirfd);
 833                         if (ret < 0) {
 834                                 perror("close");
 835                                 goto error;
 836                         }
 837
 838                         trace_id = bt_context_add_trace(ctx,
 839                                 node->fts_accpath, format_str,
 840                                 packet_seek, NULL, NULL);
 841                         if (trace_id < 0) {
 842                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 843                                         "for reading.\n", node->fts_accpath, path);
 844                                 /* Allow to skip erroneous traces. */
 845                                 continue;
 846                         }
 847                         g_array_append_val(trace_ids, trace_id);
 848                 }
 849         }
 850
 851         g_array_free(trace_ids, TRUE);
 852         return ret;
 853
 854 error:
 855         return ret;
 856 }
 857
 858 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 859                 int field_cnt, int *tid_check, int *pid_check,
 860                 int *procname_check, int *ppid_check)
 861 {
 862         int j;
 863         struct perfcounter *global;
 864         const char *name;
 865
 866         for (j = 0; j < field_cnt; j++) {
 867                 name = bt_ctf_get_decl_field_name(field_list[j]);
 868                 if (*tid_check == 0) {
 869                         if (strncmp(name, "tid", 3) == 0)
 870                                 (*tid_check)++;
 871                 }
 872                 if (*pid_check == 0) {
 873                         if (strncmp(name, "pid", 3) == 0)
 874                                 (*pid_check)++;
 875                 }
 876                 if (*ppid_check == 0) {
 877                         if (strncmp(name, "ppid", 4) == 0)
 878                                 (*ppid_check)++;
 879                 }
 880                 if (*procname_check == 0) {
 881                         if (strncmp(name, "procname", 8) == 0)
 882                                 (*procname_check)++;
 883                 }
 884                 if (strncmp(name, "perf_", 5) == 0) {
 885                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 886                         if (!global) {
 887                                 global = g_new0(struct perfcounter, 1);
 888                                 /* by default, sort on the first perf context */
 889                                 if (g_hash_table_size(global_perf_liszt) == 0)
 890                                         global->sort = 1;
 891                                 global->visible = 1;
 892                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 893                         }
 894                 }
 895         }
 896
 897         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 898                         *procname_check == 1)
 899                 return 0;
 900
 901         return -1;
 902 }
 903
 904 /*
 905  * check_requirements: check if the required context informations are available
 906  *
 907  * If each mandatory context information is available for at least in one
 908  * event, return 0 otherwise return -1.
 909  */
 910 int check_requirements(struct bt_context *ctx)
 911 {
 912         unsigned int i, evt_cnt, field_cnt;
 913         struct bt_ctf_event_decl *const * evt_list;
 914         const struct bt_ctf_field_decl *const * field_list;
 915         int tid_check = 0;
 916         int pid_check = 0;
 917         int procname_check = 0;
 918         int ppid_check = 0;
 919         int ret = 0;
 920
 921         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 922         for (i = 0; i < evt_cnt; i++) {
 923                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 924                                 &field_list, &field_cnt);
 925                 ret = check_field_requirements(field_list, field_cnt,
 926                                 &tid_check, &pid_check, &procname_check,
 927                                 &ppid_check);
 928
 929                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 930                                 &field_list, &field_cnt);
 931                 ret = check_field_requirements(field_list, field_cnt,
 932                                 &tid_check, &pid_check, &procname_check,
 933                                 &ppid_check);
 934
 935                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 936                                 &field_list, &field_cnt);
 937                 ret = check_field_requirements(field_list, field_cnt,
 938                                 &tid_check, &pid_check, &procname_check,
 939                                 &ppid_check);
 940         }
 941
 942         if (tid_check == 0) {
 943                 ret = -1;
 944                 fprintf(stderr, "[error] missing tid context information\n");
 945         }
 946         if (pid_check == 0) {
 947                 ret = -1;
 948                 fprintf(stderr, "[error] missing pid context information\n");
 949         }
 950         if (ppid_check == 0) {
 951                 ret = -1;
 952                 fprintf(stderr, "[error] missing ppid context information\n");
 953         }
 954         if (procname_check == 0) {
 955                 ret = -1;
 956                 fprintf(stderr, "[error] missing procname context information\n");
 957         }
 958
 959         return ret;
 960 }
 961
 962 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 963                 struct lttng_consumer_local_data *ctx)
 964 {
 965         unsigned long len;
 966         int err;
 967         long ret = 0;
 968         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 969
 970         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 971                 /* Get the next subbuffer */
 972                 err = helper_kernctl_get_next_subbuf(infd);
 973                 if (err != 0) {
 974                         ret = errno;
 975                         perror("Reserving sub buffer failed (everything is normal, "
 976                                         "it is due to concurrency)");
 977                         goto end;
 978                 }
 979                 /* read the whole subbuffer */
 980                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 981                 if (err != 0) {
 982                         ret = errno;
 983                         perror("Getting sub-buffer len failed.");
 984                         goto end;
 985                 }
 986
 987                 /* splice the subbuffer to the tracefile */
 988                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 989                 if (ret < 0) {
 990                         /*
 991                          * display the error but continue processing to try
 992                          * to release the subbuffer
 993                          */
 994                         fprintf(stderr,"Error splicing to tracefile\n");
 995                 }
 996                 err = helper_kernctl_put_next_subbuf(infd);
 997                 if (err != 0) {
 998                         ret = errno;
 999                         perror("Reserving sub buffer failed (everything is normal, "
1000                                         "it is due to concurrency)");
1001                         goto end;
1002                 }
1003                 sem_post(&metadata_available);
1004         }
1005
1006 end:
1007         return 0;
1008 }
1009
1010 int on_update_fd(int key, uint32_t state)
1011 {
1012         /* let the lib handle the metadata FD */
1013         if (key == sessiond_metadata)
1014                 return 0;
1015         return 1;
1016 }
1017
1018 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
1019 {
1020         int ret;
1021         struct mmap_stream *new_mmap_stream;
1022
1023         /* Opening the tracefile in write mode */
1024         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
1025                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
1026                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
1027                 if (ret < 0) {
1028                         perror("open");
1029                         goto end;
1030                 }
1031                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
1032         }
1033
1034         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
1035                 new_mmap_stream = malloc(sizeof(struct mmap_stream));
1036                 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
1037                                 kconsumerd_fd);
1038                 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1039
1040                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
1041                 /* keep mmap FDs internally */
1042                 ret = 1;
1043         } else {
1044                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
1045                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
1046                 ret = 0;
1047         }
1048
1049         reload_trace = 1;
1050
1051 end:
1052         return ret;
1053 }
1054
1055 void live_consume(struct bt_context **bt_ctx)
1056 {
1057         int ret;
1058         FILE *metadata_fp;
1059
1060         sem_wait(&metadata_available);
1061         if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
1062                 fprintf(stderr,"no metadata\n");
1063                 goto end;
1064         }
1065         metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
1066
1067         *bt_ctx = bt_context_create();
1068         ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
1069                         lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
1070         if (ret < 0) {
1071                 printf("Error adding trace\n");
1072                 goto end;
1073         }
1074
1075 end:
1076         return;
1077 }
1078
1079 int setup_consumer(char *command_sock_path, pthread_t *threads,
1080                 struct lttng_consumer_local_data *ctx)
1081 {
1082         int ret = 0;
1083
1084         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
1085                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
1086         if (!ctx)
1087                 goto end;
1088
1089         unlink(command_sock_path);
1090         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
1091         helper_lttng_consumer_init();
1092
1093         /* Create the thread to manage the receive of fd */
1094         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
1095                         (void *) ctx);
1096         if (ret != 0) {
1097                 perror("pthread_create receive fd");
1098                 goto end;
1099         }
1100         /* Create thread to manage the polling/writing of traces */
1101         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
1102                         (void *) ctx);
1103         if (ret != 0) {
1104                 perror("pthread_create poll fd");
1105                 goto end;
1106         }
1107
1108 end:
1109         return ret;
1110 }
1111
1112 int enable_kprobes(struct lttng_handle *handle, char *channel_name)
1113 {
1114         struct lttng_event ev;
1115         struct kprobes *kprobe;
1116         int ret = 0;
1117         int i;
1118
1119         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
1120                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
1121
1122                 memset(&ev, '\0', sizeof(struct lttng_event));
1123                 ev.type = LTTNG_EVENT_PROBE;
1124                 if (kprobe->symbol_name)
1125                         sprintf(ev.attr.probe.symbol_name, "%s", kprobe->symbol_name);
1126                 sprintf(ev.name, "%s", kprobe->probe_name);
1127                 ev.attr.probe.addr = kprobe->probe_addr;
1128                 ev.attr.probe.offset = kprobe->probe_offset;
1129                 if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1130                         fprintf(stderr,"error enabling kprobes : %s\n",
1131                                         helper_lttcomm_get_readable_code(ret));
1132                         goto end;
1133                 }
1134         }
1135
1136 end:
1137         return ret;
1138 }
1139
1140 int setup_live_tracing()
1141 {
1142         struct lttng_domain dom;
1143         struct lttng_channel chan;
1144         char *channel_name = "mmapchan";
1145         struct lttng_event ev;
1146         int ret = 0;
1147         char *command_sock_path = "/tmp/consumerd_sock";
1148         static pthread_t threads[2]; /* recv_fd, poll */
1149         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
1150
1151         struct lttng_handle *handle;
1152
1153         BT_INIT_LIST_HEAD(&mmap_list.head);
1154
1155         lttng_consumer_stream_array = g_ptr_array_new();
1156
1157         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
1158                 fprintf(stderr,"error setting up consumer\n");
1159                 goto error;
1160         }
1161
1162         available_snapshots = g_ptr_array_new();
1163
1164         /* setup the session */
1165         dom.type = LTTNG_DOMAIN_KERNEL;
1166
1167         ret = unlink("/tmp/livesession");
1168
1169         lttng_destroy_session("test");
1170         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
1171                 fprintf(stderr,"error creating the session : %s\n",
1172                                 helper_lttcomm_get_readable_code(ret));
1173                 goto error;
1174         }
1175
1176         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
1177                 fprintf(stderr,"error creating handle\n");
1178                 goto error_session;
1179         }
1180
1181         /*
1182          * FIXME : need to let the
1183          * helper_lttng_consumer_thread_receive_fds create the
1184          * socket.
1185          * Cleaner solution ?
1186          */
1187         while (access(command_sock_path, F_OK)) {
1188                 sleep(0.1);
1189         }
1190
1191         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
1192                 fprintf(stderr,"error registering consumer : %s\n",
1193                                 helper_lttcomm_get_readable_code(ret));
1194                 goto error_session;
1195         }
1196
1197         strcpy(chan.name, channel_name);
1198         chan.attr.overwrite = 0;
1199         if (opt_tid && opt_textdump) {
1200                 chan.attr.subbuf_size = 32768;
1201                 chan.attr.num_subbuf = 8;
1202         } else {
1203                 chan.attr.subbuf_size = 1048576; /* 1MB */
1204                 chan.attr.num_subbuf = 4;
1205         }
1206         chan.attr.switch_timer_interval = 0;
1207         chan.attr.read_timer_interval = 200;
1208         chan.attr.output = LTTNG_EVENT_MMAP;
1209
1210         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
1211                 fprintf(stderr,"error creating channel : %s\n",
1212                                 helper_lttcomm_get_readable_code(ret));
1213                 goto error_session;
1214         }
1215
1216         memset(&ev, '\0', sizeof(struct lttng_event));
1217         //sprintf(ev.name, "sched_switch");
1218         ev.type = LTTNG_EVENT_TRACEPOINT;
1219         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1220                 fprintf(stderr,"error enabling event : %s\n",
1221                                 helper_lttcomm_get_readable_code(ret));
1222                 goto error_session;
1223         }
1224
1225         memset(&ev, '\0', sizeof(struct lttng_event));
1226         ev.type = LTTNG_EVENT_SYSCALL;
1227         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1228                 fprintf(stderr,"error enabling syscalls : %s\n",
1229                                 helper_lttcomm_get_readable_code(ret));
1230                 goto error_session;
1231         }
1232
1233         if (lttngtop.kprobes_table) {
1234                 ret = enable_kprobes(handle, channel_name);
1235                 if (ret < 0) {
1236                         goto error_session;
1237                 }
1238         }
1239
1240         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
1241         lttng_add_context(handle, &kctxpid, NULL, NULL);
1242         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
1243         lttng_add_context(handle, &kctxtid, NULL, NULL);
1244         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
1245         lttng_add_context(handle, &kctxppid, NULL, NULL);
1246         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
1247         lttng_add_context(handle, &kctxcomm, NULL, NULL);
1248         kctxpid.ctx = LTTNG_EVENT_CONTEXT_VPID;
1249         lttng_add_context(handle, &kctxpid, NULL, NULL);
1250         kctxtid.ctx = LTTNG_EVENT_CONTEXT_VTID;
1251         lttng_add_context(handle, &kctxtid, NULL, NULL);
1252         kctxtid.ctx = LTTNG_EVENT_CONTEXT_HOSTNAME;
1253         lttng_add_context(handle, &kctxtid, NULL, NULL);
1254
1255         if ((ret = lttng_start_tracing("test")) < 0) {
1256                 fprintf(stderr,"error starting tracing : %s\n",
1257                                 helper_lttcomm_get_readable_code(ret));
1258                 goto error_session;
1259         }
1260
1261         helper_kernctl_buffer_flush(consumerd_metadata);
1262
1263         /* block until metadata is ready */
1264         sem_init(&metadata_available, 0, 0);
1265
1266         return 0;
1267
1268 error_session:
1269         lttng_destroy_session("test");
1270 error:
1271         return -1;
1272 }
1273
1274 int main(int argc, char **argv)
1275 {
1276         int ret;
1277         struct bt_context *bt_ctx = NULL;
1278         struct mmap_stream *mmap_info;
1279         unsigned long mmap_len;
1280
1281         init_lttngtop();
1282         ret = parse_options(argc, argv);
1283         if (ret < 0) {
1284                 fprintf(stdout, "Error parsing options.\n\n");
1285                 usage(stdout);
1286                 exit(EXIT_FAILURE);
1287         } else if (ret > 0) {
1288                 exit(EXIT_SUCCESS);
1289         }
1290
1291         if (!opt_input_path) {
1292                 if (opt_textdump) {
1293                         signal(SIGTERM, handle_textdump_sigterm);
1294                         signal(SIGINT, handle_textdump_sigterm);
1295                 }
1296                 ret = setup_live_tracing();
1297                 if (ret < 0) {
1298                         goto end;
1299                 }
1300                 if (!opt_textdump) {
1301                         pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1302                         pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1303                 }
1304                 while (!quit) {
1305                         reload_trace = 0;
1306                         live_consume(&bt_ctx);
1307                         iter_trace(bt_ctx);
1308                         ret = bt_context_remove_trace(bt_ctx, 0);
1309                         if (ret != 0)
1310                                 fprintf(stderr, "error removing trace\n");
1311                         if (bt_ctx) {
1312                                 bt_context_put(bt_ctx);
1313                         }
1314
1315                         /*
1316                          * since we receive all FDs every time there is an
1317                          * update and the FD number is different every time,
1318                          * we don't know which one are valid.
1319                          * so we check if all FDs are usable with a simple
1320                          * ioctl call.
1321                          */
1322                         bt_list_for_each_entry(mmap_info, &mmap_list.head, list) {
1323                                 ret = helper_kernctl_get_mmap_len(mmap_info->fd, &mmap_len);
1324                                 if (ret != 0) {
1325                                         bt_list_del(&mmap_info->list);
1326                                 }
1327                         }
1328                         sem_post(&metadata_available);
1329                 }
1330
1331                 pthread_join(timer_thread, NULL);
1332                 quit = 1;
1333                 pthread_join(display_thread, NULL);
1334
1335                 lttng_stop_tracing("test");
1336                 lttng_destroy_session("test");
1337
1338                 goto end;
1339         } else {
1340                 //init_lttngtop();
1341
1342                 bt_ctx = bt_context_create();
1343                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1344                 if (ret < 0) {
1345                         fprintf(stderr, "[error] Opening the trace\n");
1346                         goto end;
1347                 }
1348
1349                 ret = check_requirements(bt_ctx);
1350                 if (ret < 0) {
1351                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1352                         goto end;
1353                 }
1354                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1355                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1356
1357                 iter_trace(bt_ctx);
1358
1359                 pthread_join(display_thread, NULL);
1360                 quit = 1;
1361                 pthread_join(timer_thread, NULL);
1362         }
1363
1364 end:
1365         if (bt_ctx)
1366                 bt_context_put(bt_ctx);
1367
1368         return 0;
1369 }