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)
 218                 if (!lookup_filter_tid_list(pid))
 219                         goto end;
 220
 221         cpu_id = get_cpu_id(call_data);
 222         procname = get_context_comm(call_data);
 223
 224         if ((strcmp(bt_ctf_event_name(call_data), "exit_syscall") == 0) &&
 225                         !last_textdump_print_newline) {
 226                 scope = bt_ctf_get_top_level_scope(call_data,
 227                                 BT_EVENT_FIELDS);
 228                 syscall_ret = bt_ctf_get_int64(bt_ctf_get_field(call_data,
 229                                         scope, "_ret"));
 230                 printf("= %ld\n", syscall_ret);
 231                 last_textdump_print_newline = 1;
 232         } else {
 233                 /* we might have lost the exit_syscall event, so need to
 234                  * print the newline in this case */
 235                 if (last_textdump_print_newline == 0)
 236                         printf("\n");
 237                 printf("%02d:%02d:%02d.%09" PRIu64 " (%s) (cpu %d) [%s (%d)] %s (",
 238                                 start.tm_hour, start.tm_min, start.tm_sec,
 239                                 ts_nsec_start, hostname, cpu_id, procname, pid,
 240                                 bt_ctf_event_name(call_data));
 241                 print_fields(call_data);
 242                 printf(") ");
 243                 if (strncmp(bt_ctf_event_name(call_data), "sys_", 4) != 0) {
 244                         printf("\n");
 245                         last_textdump_print_newline = 1;
 246                 } else {
 247                         last_textdump_print_newline = 0;
 248                 }
 249         }
 250
 251 end:
 252         return BT_CB_OK;
 253 error:
 254         return BT_CB_ERROR_STOP;
 255 }
 256
 257 enum bt_cb_ret handle_kprobes(struct bt_ctf_event *call_data, void *private_data)
 258 {
 259         int i;
 260         struct kprobes *kprobe;
 261
 262         /* for kprobes */
 263         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
 264                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
 265                 if (strcmp(bt_ctf_event_name(call_data), kprobe->probe_name) == 0) {
 266                         kprobe->count++;
 267                 }
 268         }
 269
 270         return BT_CB_OK;
 271 }
 272
 273 /*
 274  * hook on each event to check the timestamp and refresh the display if
 275  * necessary
 276  */
 277 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 278 {
 279         unsigned long timestamp;
 280
 281         timestamp = bt_ctf_get_timestamp(call_data);
 282         if (timestamp == -1ULL)
 283                 goto error;
 284
 285         if (last_display_update == 0)
 286                 last_display_update = timestamp;
 287
 288         if (timestamp - last_display_update >= refresh_display) {
 289                 sem_wait(&goodtoupdate);
 290                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 291                                         timestamp));
 292                 sem_post(&goodtodisplay);
 293                 sem_post(&bootstrap);
 294                 last_display_update = timestamp;
 295         }
 296         return BT_CB_OK;
 297
 298 error:
 299         fprintf(stderr, "check_timestamp callback error\n");
 300         return BT_CB_ERROR_STOP;
 301 }
 302
 303 /*
 304  * get_perf_counter : get or create and return a perf_counter struct for
 305  * either a process or a cpu (only one of the 2 parameters mandatory)
 306  */
 307 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 308                 struct cputime *cpu)
 309 {
 310         struct perfcounter *ret;
 311         GHashTable *table;
 312
 313         if (proc)
 314                 table = proc->perf;
 315         else if (cpu)
 316                 table = cpu->perf;
 317         else
 318                 goto error;
 319
 320         ret = g_hash_table_lookup(table, (gpointer) name);
 321         if (ret)
 322                 goto end;
 323
 324         ret = g_new0(struct perfcounter, 1);
 325         /* by default, make it visible in the UI */
 326         ret->visible = 1;
 327         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 328
 329 end:
 330         return ret;
 331
 332 error:
 333         return NULL;
 334 }
 335
 336 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 337                 const char *name, int value)
 338 {
 339         struct perfcounter *cpu_perf, *process_perf;
 340
 341         cpu_perf = get_perf_counter(name, NULL, cpu);
 342         if (cpu_perf->count < value) {
 343                 process_perf = get_perf_counter(name, proc, NULL);
 344                 process_perf->count += value - cpu_perf->count;
 345                 cpu_perf->count = value;
 346         }
 347 }
 348
 349 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 350                 const struct bt_definition *scope,
 351                 struct processtop *proc,
 352                 struct cputime *cpu)
 353 {
 354         struct bt_definition const * const *list = NULL;
 355         const struct bt_definition *field;
 356         unsigned int count;
 357         struct perfcounter *perfcounter;
 358         GHashTableIter iter;
 359         gpointer key;
 360         int ret;
 361
 362         if (!scope)
 363                 goto end;
 364
 365         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 366         if (ret < 0)
 367                 goto end;
 368
 369         if (count == 0)
 370                 goto end;
 371
 372         g_hash_table_iter_init(&iter, global_perf_liszt);
 373         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 374                 field = bt_ctf_get_field(event, scope, (char *) key);
 375                 if (field) {
 376                         int value = bt_ctf_get_uint64(field);
 377                         if (bt_ctf_field_get_error())
 378                                 continue;
 379                         update_perf_value(proc, cpu, (char *) key, value);
 380                 }
 381         }
 382
 383 end:
 384         return;
 385 }
 386
 387 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 388 {
 389         struct cputime *cpu;
 390         const struct bt_definition *scope;
 391
 392         cpu = get_cpu(get_cpu_id(event));
 393
 394         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 395         extract_perf_counter_scope(event, scope, proc, cpu);
 396
 397         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 398         extract_perf_counter_scope(event, scope, proc, cpu);
 399
 400         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 401         extract_perf_counter_scope(event, scope, proc, cpu);
 402 }
 403
 404 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 405                 void *private_data)
 406 {
 407         int pid, tid, ppid, vpid, vtid, vppid;
 408         char *comm, *hostname;
 409         struct processtop *parent, *child;
 410         unsigned long timestamp;
 411
 412         timestamp = bt_ctf_get_timestamp(call_data);
 413         if (timestamp == -1ULL)
 414                 goto error;
 415
 416         pid = get_context_pid(call_data);
 417         if (pid == -1ULL) {
 418                 goto error;
 419         }
 420
 421         tid = get_context_tid(call_data);
 422         if (tid == -1ULL) {
 423                 goto error;
 424         }
 425         ppid = get_context_ppid(call_data);
 426         if (ppid == -1ULL) {
 427                 goto error;
 428         }
 429         vpid = get_context_vpid(call_data);
 430         if (pid == -1ULL) {
 431                 vpid = -1;
 432         }
 433         vtid = get_context_vtid(call_data);
 434         if (tid == -1ULL) {
 435                 vtid = -1;
 436         }
 437         vppid = get_context_vppid(call_data);
 438         if (ppid == -1ULL) {
 439                 vppid = -1;
 440         }
 441         comm = get_context_comm(call_data);
 442         if (!comm) {
 443                 goto error;
 444         }
 445         /* optional */
 446         hostname = get_context_hostname(call_data);
 447
 448         /* find or create the current process */
 449         child = find_process_tid(&lttngtop, tid, comm);
 450         if (!child)
 451                 child = add_proc(&lttngtop, tid, comm, timestamp, hostname);
 452         if (!child)
 453                 goto end;
 454         update_proc(child, pid, tid, ppid, vpid, vtid, vppid, comm, hostname);
 455
 456         if (pid != tid) {
 457                 /* find or create the parent */
 458                 parent = find_process_tid(&lttngtop, pid, comm);
 459                 if (!parent) {
 460                         parent = add_proc(&lttngtop, pid, comm, timestamp, hostname);
 461                         if (parent)
 462                                 parent->pid = pid;
 463                 }
 464
 465                 /* attach the parent to the current process */
 466                 child->threadparent = parent;
 467                 add_thread(parent, child);
 468         }
 469
 470         update_perf_counter(child, call_data);
 471
 472 end:
 473         return BT_CB_OK;
 474
 475 error:
 476         return BT_CB_ERROR_STOP;
 477 }
 478
 479 void init_lttngtop()
 480 {
 481         copies = g_ptr_array_new();
 482         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 483         global_filter_list = g_hash_table_new(g_str_hash, g_str_equal);
 484
 485         sem_init(&goodtodisplay, 0, 0);
 486         sem_init(&goodtoupdate, 0, 1);
 487         sem_init(&timer, 0, 1);
 488         sem_init(&bootstrap, 0, 0);
 489         sem_init(&pause_sem, 0, 1);
 490         sem_init(&end_trace_sem, 0, 0);
 491
 492         reset_global_counters();
 493         lttngtop.nbproc = 0;
 494         lttngtop.nbthreads = 0;
 495         lttngtop.nbfiles = 0;
 496
 497         lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
 498                         g_direct_equal);
 499         lttngtop.process_table = g_ptr_array_new();
 500         lttngtop.files_table = g_ptr_array_new();
 501         lttngtop.cpu_table = g_ptr_array_new();
 502
 503         toggle_filter = -1;
 504 }
 505
 506 void usage(FILE *fp)
 507 {
 508         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 509         fprintf(fp, "Usage : lttngtop [OPTIONS] [TRACE]\n");
 510         fprintf(fp, "  TRACE                    Path to the trace to analyse (no trace path for live tracing)\n");
 511         fprintf(fp, "  -h, --help               This help message\n");
 512         fprintf(fp, "  -t, --textdump           Display live events in text-only\n");
 513         fprintf(fp, "  -p, --pid                Comma-separated list of PIDs to display\n");
 514         fprintf(fp, "  -f, --child              Follow threads associated with selected PIDs\n");
 515         fprintf(fp, "  -n, --hostname           Comma-separated list of hostnames to display (require hostname context in trace)\n");
 516         fprintf(fp, "  -k, --kprobes            Comma-separated list of kprobes to insert (same format as lttng enable-event)\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                                 toggle_filter = 1;
 623                                 tid_filter_list = g_hash_table_new(g_str_hash,
 624                                                 g_str_equal);
 625                                 tmp_str = strtok(opt_tid, ",");
 626                                 while (tmp_str) {
 627                                         tid = malloc(sizeof(int));
 628                                         *tid = atoi(tmp_str);
 629                                         g_hash_table_insert(tid_filter_list,
 630                                                         (gpointer) tid, tid);
 631                                         tmp_str = strtok(NULL, ",");
 632                                 }
 633                                 break;
 634                         case OPT_HOSTNAME:
 635                                 toggle_filter = 1;
 636                                 hostname_filter_list = g_hash_table_new(g_str_hash,
 637                                                 g_str_equal);
 638                                 tmp_str = strtok(opt_hostname, ",");
 639                                 while (tmp_str) {
 640                                         char *new_str = strdup(tmp_str);
 641                                         g_hash_table_insert(hostname_filter_list,
 642                                                         (gpointer) new_str,
 643                                                         (gpointer) new_str);
 644                                         tmp_str = strtok(NULL, ",");
 645                                 }
 646                                 break;
 647                         case OPT_KPROBES:
 648                                 lttngtop.kprobes_table = g_ptr_array_new();
 649                                 tmp_str = strtok(opt_kprobes, ",");
 650                                 while (tmp_str) {
 651                                         struct kprobes *kprobe;
 652
 653                                         kprobe = parse_probe_opts(tmp_str);
 654                                         if (kprobe) {
 655                                                 g_ptr_array_add(
 656                                                         lttngtop.kprobes_table,
 657                                                         kprobe);
 658                                         } else {
 659                                                 ret = -EINVAL;
 660                                                 goto end;
 661                                         }
 662                                         tmp_str = strtok(NULL, ",");
 663                                 }
 664                                 break;
 665                         default:
 666                                 ret = -EINVAL;
 667                                 goto end;
 668                 }
 669         }
 670
 671         opt_input_path = poptGetArg(pc);
 672
 673 end:
 674         if (pc) {
 675                 poptFreeContext(pc);
 676         }
 677         return ret;
 678 }
 679
 680 void iter_trace(struct bt_context *bt_ctx)
 681 {
 682         struct bt_ctf_iter *iter;
 683         struct bt_iter_pos begin_pos;
 684         struct kprobes *kprobe;
 685         const struct bt_ctf_event *event;
 686         int i;
 687         int ret = 0;
 688
 689         begin_pos.type = BT_SEEK_BEGIN;
 690         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 691
 692         /* at each event, verify the status of the process table */
 693         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 694                         fix_process_table,
 695                         NULL, NULL, NULL);
 696         if (opt_textdump) {
 697                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 698                                 print_timestamp,
 699                                 NULL, NULL, NULL);
 700         } else {
 701                 /* at each event check if we need to refresh */
 702                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 703                                 check_timestamp,
 704                                 NULL, NULL, NULL);
 705                 /* to handle the scheduling events */
 706                 bt_ctf_iter_add_callback(iter,
 707                                 g_quark_from_static_string("sched_switch"),
 708                                 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 709                 /* to clean up the process table */
 710                 bt_ctf_iter_add_callback(iter,
 711                                 g_quark_from_static_string("sched_process_free"),
 712                                 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 713                 /* to get all the process from the statedumps */
 714                 bt_ctf_iter_add_callback(iter,
 715                                 g_quark_from_static_string(
 716                                         "lttng_statedump_process_state"),
 717                                 NULL, 0, handle_statedump_process_state,
 718                                 NULL, NULL, NULL);
 719
 720                 /* for IO top */
 721                 bt_ctf_iter_add_callback(iter,
 722                                 g_quark_from_static_string("exit_syscall"),
 723                                 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 724                 bt_ctf_iter_add_callback(iter,
 725                                 g_quark_from_static_string("sys_write"),
 726                                 NULL, 0, handle_sys_write, NULL, NULL, NULL);
 727                 bt_ctf_iter_add_callback(iter,
 728                                 g_quark_from_static_string("sys_read"),
 729                                 NULL, 0, handle_sys_read, NULL, NULL, NULL);
 730                 bt_ctf_iter_add_callback(iter,
 731                                 g_quark_from_static_string("sys_open"),
 732                                 NULL, 0, handle_sys_open, NULL, NULL, NULL);
 733                 bt_ctf_iter_add_callback(iter,
 734                                 g_quark_from_static_string("sys_close"),
 735                                 NULL, 0, handle_sys_close, NULL, NULL, NULL);
 736                 bt_ctf_iter_add_callback(iter,
 737                                 g_quark_from_static_string(
 738                                         "lttng_statedump_file_descriptor"),
 739                                 NULL, 0, handle_statedump_file_descriptor,
 740                                 NULL, NULL, NULL);
 741
 742                 /* for kprobes */
 743                 if (lttngtop.kprobes_table) {
 744                         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
 745                                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
 746                                 bt_ctf_iter_add_callback(iter,
 747                                                 g_quark_from_static_string(
 748                                                         kprobe->probe_name),
 749                                                 NULL, 0, handle_kprobes,
 750                                                 NULL, NULL, NULL);
 751                         }
 752                 }
 753         }
 754
 755         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 756                 if (quit || reload_trace)
 757                         goto end_iter;
 758                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 759                 if (ret < 0)
 760                         goto end_iter;
 761         }
 762
 763         /* block until quit, we reached the end of the trace */
 764         sem_wait(&end_trace_sem);
 765
 766 end_iter:
 767         bt_ctf_iter_destroy(iter);
 768 }
 769
 770 /*
 771  * bt_context_add_traces_recursive: Open a trace recursively
 772  * (copied from BSD code in converter/babeltrace.c)
 773  *
 774  * Find each trace present in the subdirectory starting from the given
 775  * path, and add them to the context. The packet_seek parameter can be
 776  * NULL: this specify to use the default format packet_seek.
 777  *
 778  * Return: 0 on success, nonzero on failure.
 779  * Unable to open toplevel: failure.
 780  * Unable to open some subdirectory or file: warn and continue;
 781  */
 782 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 783                 const char *format_str,
 784                 void (*packet_seek)(struct bt_stream_pos *pos,
 785                         size_t offset, int whence))
 786 {
 787         FTS *tree;
 788         FTSENT *node;
 789         GArray *trace_ids;
 790         char lpath[PATH_MAX];
 791         char * const paths[2] = { lpath, NULL };
 792         int ret = -1;
 793
 794         /*
 795          * Need to copy path, because fts_open can change it.
 796          * It is the pointer array, not the strings, that are constant.
 797          */
 798         strncpy(lpath, path, PATH_MAX);
 799         lpath[PATH_MAX - 1] = '\0';
 800
 801         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 802         if (tree == NULL) {
 803                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 804                                 path);
 805                 return -EINVAL;
 806         }
 807
 808         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 809
 810         while ((node = fts_read(tree))) {
 811                 int dirfd, metafd;
 812
 813                 if (!(node->fts_info & FTS_D))
 814                         continue;
 815
 816                 dirfd = open(node->fts_accpath, 0);
 817                 if (dirfd < 0) {
 818                         fprintf(stderr, "[error] [Context] Unable to open trace "
 819                                 "directory file descriptor.\n");
 820                         ret = dirfd;
 821                         goto error;
 822                 }
 823                 metafd = openat(dirfd, "metadata", O_RDONLY);
 824                 if (metafd < 0) {
 825                         close(dirfd);
 826                         ret = -1;
 827                         continue;
 828                 } else {
 829                         int trace_id;
 830
 831                         ret = close(metafd);
 832                         if (ret < 0) {
 833                                 perror("close");
 834                                 goto error;
 835                         }
 836                         ret = close(dirfd);
 837                         if (ret < 0) {
 838                                 perror("close");
 839                                 goto error;
 840                         }
 841
 842                         trace_id = bt_context_add_trace(ctx,
 843                                 node->fts_accpath, format_str,
 844                                 packet_seek, NULL, NULL);
 845                         if (trace_id < 0) {
 846                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 847                                         "for reading.\n", node->fts_accpath, path);
 848                                 /* Allow to skip erroneous traces. */
 849                                 continue;
 850                         }
 851                         g_array_append_val(trace_ids, trace_id);
 852                 }
 853         }
 854
 855         g_array_free(trace_ids, TRUE);
 856         return ret;
 857
 858 error:
 859         return ret;
 860 }
 861
 862 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 863                 int field_cnt, int *tid_check, int *pid_check,
 864                 int *procname_check, int *ppid_check)
 865 {
 866         int j;
 867         struct perfcounter *global;
 868         const char *name;
 869
 870         for (j = 0; j < field_cnt; j++) {
 871                 name = bt_ctf_get_decl_field_name(field_list[j]);
 872                 if (*tid_check == 0) {
 873                         if (strncmp(name, "tid", 3) == 0)
 874                                 (*tid_check)++;
 875                 }
 876                 if (*pid_check == 0) {
 877                         if (strncmp(name, "pid", 3) == 0)
 878                                 (*pid_check)++;
 879                 }
 880                 if (*ppid_check == 0) {
 881                         if (strncmp(name, "ppid", 4) == 0)
 882                                 (*ppid_check)++;
 883                 }
 884                 if (*procname_check == 0) {
 885                         if (strncmp(name, "procname", 8) == 0)
 886                                 (*procname_check)++;
 887                 }
 888                 if (strncmp(name, "perf_", 5) == 0) {
 889                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 890                         if (!global) {
 891                                 global = g_new0(struct perfcounter, 1);
 892                                 /* by default, sort on the first perf context */
 893                                 if (g_hash_table_size(global_perf_liszt) == 0)
 894                                         global->sort = 1;
 895                                 global->visible = 1;
 896                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 897                         }
 898                 }
 899         }
 900
 901         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 902                         *procname_check == 1)
 903                 return 0;
 904
 905         return -1;
 906 }
 907
 908 /*
 909  * check_requirements: check if the required context informations are available
 910  *
 911  * If each mandatory context information is available for at least in one
 912  * event, return 0 otherwise return -1.
 913  */
 914 int check_requirements(struct bt_context *ctx)
 915 {
 916         unsigned int i, evt_cnt, field_cnt;
 917         struct bt_ctf_event_decl *const * evt_list;
 918         const struct bt_ctf_field_decl *const * field_list;
 919         int tid_check = 0;
 920         int pid_check = 0;
 921         int procname_check = 0;
 922         int ppid_check = 0;
 923         int ret = 0;
 924
 925         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 926         for (i = 0; i < evt_cnt; i++) {
 927                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 928                                 &field_list, &field_cnt);
 929                 ret = check_field_requirements(field_list, field_cnt,
 930                                 &tid_check, &pid_check, &procname_check,
 931                                 &ppid_check);
 932
 933                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 934                                 &field_list, &field_cnt);
 935                 ret = check_field_requirements(field_list, field_cnt,
 936                                 &tid_check, &pid_check, &procname_check,
 937                                 &ppid_check);
 938
 939                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 940                                 &field_list, &field_cnt);
 941                 ret = check_field_requirements(field_list, field_cnt,
 942                                 &tid_check, &pid_check, &procname_check,
 943                                 &ppid_check);
 944         }
 945
 946         if (tid_check == 0) {
 947                 ret = -1;
 948                 fprintf(stderr, "[error] missing tid context information\n");
 949         }
 950         if (pid_check == 0) {
 951                 ret = -1;
 952                 fprintf(stderr, "[error] missing pid context information\n");
 953         }
 954         if (ppid_check == 0) {
 955                 ret = -1;
 956                 fprintf(stderr, "[error] missing ppid context information\n");
 957         }
 958         if (procname_check == 0) {
 959                 ret = -1;
 960                 fprintf(stderr, "[error] missing procname context information\n");
 961         }
 962
 963         return ret;
 964 }
 965
 966 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 967                 struct lttng_consumer_local_data *ctx)
 968 {
 969         unsigned long len;
 970         int err;
 971         long ret = 0;
 972         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 973
 974         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 975                 /* Get the next subbuffer */
 976                 err = helper_kernctl_get_next_subbuf(infd);
 977                 if (err != 0) {
 978                         ret = errno;
 979                         perror("Reserving sub buffer failed (everything is normal, "
 980                                         "it is due to concurrency)");
 981                         goto end;
 982                 }
 983                 /* read the whole subbuffer */
 984                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 985                 if (err != 0) {
 986                         ret = errno;
 987                         perror("Getting sub-buffer len failed.");
 988                         goto end;
 989                 }
 990
 991                 /* splice the subbuffer to the tracefile */
 992                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 993                 if (ret < 0) {
 994                         /*
 995                          * display the error but continue processing to try
 996                          * to release the subbuffer
 997                          */
 998                         fprintf(stderr,"Error splicing to tracefile\n");
 999                 }
1000                 err = helper_kernctl_put_next_subbuf(infd);
1001                 if (err != 0) {
1002                         ret = errno;
1003                         perror("Reserving sub buffer failed (everything is normal, "
1004                                         "it is due to concurrency)");
1005                         goto end;
1006                 }
1007                 sem_post(&metadata_available);
1008         }
1009
1010 end:
1011         return 0;
1012 }
1013
1014 int on_update_fd(int key, uint32_t state)
1015 {
1016         /* let the lib handle the metadata FD */
1017         if (key == sessiond_metadata)
1018                 return 0;
1019         return 1;
1020 }
1021
1022 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
1023 {
1024         int ret;
1025         struct mmap_stream *new_mmap_stream;
1026
1027         /* Opening the tracefile in write mode */
1028         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
1029                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
1030                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
1031                 if (ret < 0) {
1032                         perror("open");
1033                         goto end;
1034                 }
1035                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
1036         }
1037
1038         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
1039                 new_mmap_stream = malloc(sizeof(struct mmap_stream));
1040                 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
1041                                 kconsumerd_fd);
1042                 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1043
1044                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
1045                 /* keep mmap FDs internally */
1046                 ret = 1;
1047         } else {
1048                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
1049                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
1050                 ret = 0;
1051         }
1052
1053         reload_trace = 1;
1054
1055 end:
1056         return ret;
1057 }
1058
1059 void live_consume(struct bt_context **bt_ctx)
1060 {
1061         int ret;
1062         FILE *metadata_fp;
1063
1064         sem_wait(&metadata_available);
1065         if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
1066                 fprintf(stderr,"no metadata\n");
1067                 goto end;
1068         }
1069         metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
1070
1071         *bt_ctx = bt_context_create();
1072         ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
1073                         lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
1074         if (ret < 0) {
1075                 printf("Error adding trace\n");
1076                 goto end;
1077         }
1078
1079 end:
1080         return;
1081 }
1082
1083 int setup_consumer(char *command_sock_path, pthread_t *threads,
1084                 struct lttng_consumer_local_data *ctx)
1085 {
1086         int ret = 0;
1087
1088         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
1089                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
1090         if (!ctx)
1091                 goto end;
1092
1093         unlink(command_sock_path);
1094         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
1095         helper_lttng_consumer_init();
1096
1097         /* Create the thread to manage the receive of fd */
1098         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
1099                         (void *) ctx);
1100         if (ret != 0) {
1101                 perror("pthread_create receive fd");
1102                 goto end;
1103         }
1104         /* Create thread to manage the polling/writing of traces */
1105         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
1106                         (void *) ctx);
1107         if (ret != 0) {
1108                 perror("pthread_create poll fd");
1109                 goto end;
1110         }
1111
1112 end:
1113         return ret;
1114 }
1115
1116 int enable_kprobes(struct lttng_handle *handle, char *channel_name)
1117 {
1118         struct lttng_event ev;
1119         struct kprobes *kprobe;
1120         int ret = 0;
1121         int i;
1122
1123         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
1124                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
1125
1126                 memset(&ev, '\0', sizeof(struct lttng_event));
1127                 ev.type = LTTNG_EVENT_PROBE;
1128                 if (kprobe->symbol_name)
1129                         sprintf(ev.attr.probe.symbol_name, "%s", kprobe->symbol_name);
1130                 sprintf(ev.name, "%s", kprobe->probe_name);
1131                 ev.attr.probe.addr = kprobe->probe_addr;
1132                 ev.attr.probe.offset = kprobe->probe_offset;
1133                 if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1134                         fprintf(stderr,"error enabling kprobes : %s\n",
1135                                         helper_lttcomm_get_readable_code(ret));
1136                         goto end;
1137                 }
1138         }
1139
1140 end:
1141         return ret;
1142 }
1143
1144 int setup_live_tracing()
1145 {
1146         struct lttng_domain dom;
1147         struct lttng_channel chan;
1148         char *channel_name = "mmapchan";
1149         struct lttng_event ev;
1150         int ret = 0;
1151         char *command_sock_path = "/tmp/consumerd_sock";
1152         static pthread_t threads[2]; /* recv_fd, poll */
1153         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
1154
1155         struct lttng_handle *handle;
1156
1157         BT_INIT_LIST_HEAD(&mmap_list.head);
1158
1159         lttng_consumer_stream_array = g_ptr_array_new();
1160
1161         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
1162                 fprintf(stderr,"error setting up consumer\n");
1163                 goto error;
1164         }
1165
1166         available_snapshots = g_ptr_array_new();
1167
1168         /* setup the session */
1169         dom.type = LTTNG_DOMAIN_KERNEL;
1170
1171         ret = unlink("/tmp/livesession");
1172
1173         lttng_destroy_session("test");
1174         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
1175                 fprintf(stderr,"error creating the session : %s\n",
1176                                 helper_lttcomm_get_readable_code(ret));
1177                 goto error;
1178         }
1179
1180         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
1181                 fprintf(stderr,"error creating handle\n");
1182                 goto error_session;
1183         }
1184
1185         /*
1186          * FIXME : need to let the
1187          * helper_lttng_consumer_thread_receive_fds create the
1188          * socket.
1189          * Cleaner solution ?
1190          */
1191         while (access(command_sock_path, F_OK)) {
1192                 sleep(0.1);
1193         }
1194
1195         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
1196                 fprintf(stderr,"error registering consumer : %s\n",
1197                                 helper_lttcomm_get_readable_code(ret));
1198                 goto error_session;
1199         }
1200
1201         strcpy(chan.name, channel_name);
1202         chan.attr.overwrite = 0;
1203         if (opt_tid && opt_textdump) {
1204                 chan.attr.subbuf_size = 32768;
1205                 chan.attr.num_subbuf = 8;
1206         } else {
1207                 //chan.attr.subbuf_size = 1048576; /* 1MB */
1208                 chan.attr.subbuf_size = 2097152; /* 1MB */
1209                 chan.attr.num_subbuf = 4;
1210         }
1211         chan.attr.switch_timer_interval = 0;
1212         chan.attr.read_timer_interval = 200;
1213         chan.attr.output = LTTNG_EVENT_MMAP;
1214
1215         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
1216                 fprintf(stderr,"error creating channel : %s\n",
1217                                 helper_lttcomm_get_readable_code(ret));
1218                 goto error_session;
1219         }
1220
1221         memset(&ev, '\0', sizeof(struct lttng_event));
1222         //sprintf(ev.name, "sched_switch");
1223         ev.type = LTTNG_EVENT_TRACEPOINT;
1224         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1225                 fprintf(stderr,"error enabling event : %s\n",
1226                                 helper_lttcomm_get_readable_code(ret));
1227                 goto error_session;
1228         }
1229
1230         memset(&ev, '\0', sizeof(struct lttng_event));
1231         ev.type = LTTNG_EVENT_SYSCALL;
1232         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1233                 fprintf(stderr,"error enabling syscalls : %s\n",
1234                                 helper_lttcomm_get_readable_code(ret));
1235                 goto error_session;
1236         }
1237
1238         if (lttngtop.kprobes_table) {
1239                 ret = enable_kprobes(handle, channel_name);
1240                 if (ret < 0) {
1241                         goto error_session;
1242                 }
1243         }
1244
1245         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
1246         lttng_add_context(handle, &kctxpid, NULL, NULL);
1247         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
1248         lttng_add_context(handle, &kctxtid, NULL, NULL);
1249         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
1250         lttng_add_context(handle, &kctxppid, NULL, NULL);
1251         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
1252         lttng_add_context(handle, &kctxcomm, NULL, NULL);
1253         kctxpid.ctx = LTTNG_EVENT_CONTEXT_VPID;
1254         lttng_add_context(handle, &kctxpid, NULL, NULL);
1255         kctxtid.ctx = LTTNG_EVENT_CONTEXT_VTID;
1256         lttng_add_context(handle, &kctxtid, NULL, NULL);
1257         kctxtid.ctx = LTTNG_EVENT_CONTEXT_HOSTNAME;
1258         lttng_add_context(handle, &kctxtid, NULL, NULL);
1259
1260         if ((ret = lttng_start_tracing("test")) < 0) {
1261                 fprintf(stderr,"error starting tracing : %s\n",
1262                                 helper_lttcomm_get_readable_code(ret));
1263                 goto error_session;
1264         }
1265
1266         helper_kernctl_buffer_flush(consumerd_metadata);
1267
1268         /* block until metadata is ready */
1269         sem_init(&metadata_available, 0, 0);
1270
1271         return 0;
1272
1273 error_session:
1274         lttng_destroy_session("test");
1275 error:
1276         return -1;
1277 }
1278
1279 int main(int argc, char **argv)
1280 {
1281         int ret;
1282         struct bt_context *bt_ctx = NULL;
1283         struct mmap_stream *mmap_info;
1284         unsigned long mmap_len;
1285
1286         init_lttngtop();
1287         ret = parse_options(argc, argv);
1288         if (ret < 0) {
1289                 fprintf(stdout, "Error parsing options.\n\n");
1290                 usage(stdout);
1291                 exit(EXIT_FAILURE);
1292         } else if (ret > 0) {
1293                 exit(EXIT_SUCCESS);
1294         }
1295
1296         if (!opt_input_path) {
1297                 if (opt_textdump) {
1298                         signal(SIGTERM, handle_textdump_sigterm);
1299                         signal(SIGINT, handle_textdump_sigterm);
1300                 }
1301                 ret = setup_live_tracing();
1302                 if (ret < 0) {
1303                         goto end;
1304                 }
1305                 if (!opt_textdump) {
1306                         pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1307                         pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1308                 }
1309                 while (!quit) {
1310                         reload_trace = 0;
1311                         live_consume(&bt_ctx);
1312                         iter_trace(bt_ctx);
1313                         ret = bt_context_remove_trace(bt_ctx, 0);
1314                         if (ret != 0)
1315                                 fprintf(stderr, "error removing trace\n");
1316                         if (bt_ctx) {
1317                                 bt_context_put(bt_ctx);
1318                         }
1319
1320                         /*
1321                          * since we receive all FDs every time there is an
1322                          * update and the FD number is different every time,
1323                          * we don't know which one are valid.
1324                          * so we check if all FDs are usable with a simple
1325                          * ioctl call.
1326                          */
1327                         bt_list_for_each_entry(mmap_info, &mmap_list.head, list) {
1328                                 ret = helper_kernctl_get_mmap_len(mmap_info->fd, &mmap_len);
1329                                 if (ret != 0) {
1330                                         bt_list_del(&mmap_info->list);
1331                                 }
1332                         }
1333                         sem_post(&metadata_available);
1334                 }
1335
1336                 pthread_join(timer_thread, NULL);
1337                 quit = 1;
1338                 pthread_join(display_thread, NULL);
1339
1340                 lttng_stop_tracing("test");
1341                 lttng_destroy_session("test");
1342
1343                 goto end;
1344         } else {
1345                 //init_lttngtop();
1346
1347                 bt_ctx = bt_context_create();
1348                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1349                 if (ret < 0) {
1350                         fprintf(stderr, "[error] Opening the trace\n");
1351                         goto end;
1352                 }
1353
1354                 ret = check_requirements(bt_ctx);
1355                 if (ret < 0) {
1356                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1357                         goto end;
1358                 }
1359                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1360                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1361
1362                 iter_trace(bt_ctx);
1363
1364                 pthread_join(display_thread, NULL);
1365                 quit = 1;
1366                 pthread_join(timer_thread, NULL);
1367         }
1368
1369 end:
1370         if (bt_ctx)
1371                 bt_context_put(bt_ctx);
1372
1373         return 0;
1374 }