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         /*
 222         if (!opt_tid && (opt_hostname && !lookup_hostname_list(hostname)))
 223                 goto end;
 224         if (!opt_hostname && (opt_tid && !lookup_tid_list(pid)))
 225                 goto end;
 226         if ((opt_tid && !lookup_tid_list(pid)) &&
 227                         (opt_hostname && !lookup_hostname_list(hostname)))
 228                 goto end;
 229                 */
 230
 231         cpu_id = get_cpu_id(call_data);
 232         procname = get_context_comm(call_data);
 233
 234         if ((strcmp(bt_ctf_event_name(call_data), "exit_syscall") == 0) &&
 235                         !last_textdump_print_newline) {
 236                 scope = bt_ctf_get_top_level_scope(call_data,
 237                                 BT_EVENT_FIELDS);
 238                 syscall_ret = bt_ctf_get_int64(bt_ctf_get_field(call_data,
 239                                         scope, "_ret"));
 240                 printf("= %ld\n", syscall_ret);
 241                 last_textdump_print_newline = 1;
 242         } else {
 243                 /* we might have lost the exit_syscall event, so need to
 244                  * print the newline in this case */
 245                 if (last_textdump_print_newline == 0)
 246                         printf("\n");
 247                 printf("%02d:%02d:%02d.%09" PRIu64 " (%s) (cpu %d) [%s (%d)] %s (",
 248                                 start.tm_hour, start.tm_min, start.tm_sec,
 249                                 ts_nsec_start, hostname, cpu_id, procname, pid,
 250                                 bt_ctf_event_name(call_data));
 251                 print_fields(call_data);
 252                 printf(") ");
 253                 if (strncmp(bt_ctf_event_name(call_data), "sys_", 4) != 0) {
 254                         printf("\n");
 255                         last_textdump_print_newline = 1;
 256                 } else {
 257                         last_textdump_print_newline = 0;
 258                 }
 259         }
 260
 261 end:
 262         return BT_CB_OK;
 263 error:
 264         return BT_CB_ERROR_STOP;
 265 }
 266
 267 enum bt_cb_ret handle_kprobes(struct bt_ctf_event *call_data, void *private_data)
 268 {
 269         int i;
 270         struct kprobes *kprobe;
 271
 272         /* for kprobes */
 273         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
 274                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
 275                 if (strcmp(bt_ctf_event_name(call_data), kprobe->probe_name) == 0) {
 276                         kprobe->count++;
 277                 }
 278         }
 279
 280         return BT_CB_OK;
 281 }
 282
 283 /*
 284  * hook on each event to check the timestamp and refresh the display if
 285  * necessary
 286  */
 287 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 288 {
 289         unsigned long timestamp;
 290
 291         timestamp = bt_ctf_get_timestamp(call_data);
 292         if (timestamp == -1ULL)
 293                 goto error;
 294
 295         if (last_display_update == 0)
 296                 last_display_update = timestamp;
 297
 298         if (timestamp - last_display_update >= refresh_display) {
 299                 sem_wait(&goodtoupdate);
 300                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 301                                         timestamp));
 302                 sem_post(&goodtodisplay);
 303                 sem_post(&bootstrap);
 304                 last_display_update = timestamp;
 305         }
 306         return BT_CB_OK;
 307
 308 error:
 309         fprintf(stderr, "check_timestamp callback error\n");
 310         return BT_CB_ERROR_STOP;
 311 }
 312
 313 /*
 314  * get_perf_counter : get or create and return a perf_counter struct for
 315  * either a process or a cpu (only one of the 2 parameters mandatory)
 316  */
 317 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 318                 struct cputime *cpu)
 319 {
 320         struct perfcounter *ret;
 321         GHashTable *table;
 322
 323         if (proc)
 324                 table = proc->perf;
 325         else if (cpu)
 326                 table = cpu->perf;
 327         else
 328                 goto error;
 329
 330         ret = g_hash_table_lookup(table, (gpointer) name);
 331         if (ret)
 332                 goto end;
 333
 334         ret = g_new0(struct perfcounter, 1);
 335         /* by default, make it visible in the UI */
 336         ret->visible = 1;
 337         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 338
 339 end:
 340         return ret;
 341
 342 error:
 343         return NULL;
 344 }
 345
 346 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 347                 const char *name, int value)
 348 {
 349         struct perfcounter *cpu_perf, *process_perf;
 350
 351         cpu_perf = get_perf_counter(name, NULL, cpu);
 352         if (cpu_perf->count < value) {
 353                 process_perf = get_perf_counter(name, proc, NULL);
 354                 process_perf->count += value - cpu_perf->count;
 355                 cpu_perf->count = value;
 356         }
 357 }
 358
 359 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 360                 const struct bt_definition *scope,
 361                 struct processtop *proc,
 362                 struct cputime *cpu)
 363 {
 364         struct bt_definition const * const *list = NULL;
 365         const struct bt_definition *field;
 366         unsigned int count;
 367         struct perfcounter *perfcounter;
 368         GHashTableIter iter;
 369         gpointer key;
 370         int ret;
 371
 372         if (!scope)
 373                 goto end;
 374
 375         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 376         if (ret < 0)
 377                 goto end;
 378
 379         if (count == 0)
 380                 goto end;
 381
 382         g_hash_table_iter_init(&iter, global_perf_liszt);
 383         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 384                 field = bt_ctf_get_field(event, scope, (char *) key);
 385                 if (field) {
 386                         int value = bt_ctf_get_uint64(field);
 387                         if (bt_ctf_field_get_error())
 388                                 continue;
 389                         update_perf_value(proc, cpu, (char *) key, value);
 390                 }
 391         }
 392
 393 end:
 394         return;
 395 }
 396
 397 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 398 {
 399         struct cputime *cpu;
 400         const struct bt_definition *scope;
 401
 402         cpu = get_cpu(get_cpu_id(event));
 403
 404         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 405         extract_perf_counter_scope(event, scope, proc, cpu);
 406
 407         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 408         extract_perf_counter_scope(event, scope, proc, cpu);
 409
 410         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 411         extract_perf_counter_scope(event, scope, proc, cpu);
 412 }
 413
 414 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 415                 void *private_data)
 416 {
 417         int pid, tid, ppid, vpid, vtid, vppid;
 418         char *comm, *hostname;
 419         struct processtop *parent, *child;
 420         unsigned long timestamp;
 421
 422         timestamp = bt_ctf_get_timestamp(call_data);
 423         if (timestamp == -1ULL)
 424                 goto error;
 425
 426         pid = get_context_pid(call_data);
 427         if (pid == -1ULL) {
 428                 goto error;
 429         }
 430
 431         tid = get_context_tid(call_data);
 432         if (tid == -1ULL) {
 433                 goto error;
 434         }
 435         ppid = get_context_ppid(call_data);
 436         if (ppid == -1ULL) {
 437                 goto error;
 438         }
 439         vpid = get_context_vpid(call_data);
 440         if (pid == -1ULL) {
 441                 vpid = -1;
 442         }
 443         vtid = get_context_vtid(call_data);
 444         if (tid == -1ULL) {
 445                 vtid = -1;
 446         }
 447         vppid = get_context_vppid(call_data);
 448         if (ppid == -1ULL) {
 449                 vppid = -1;
 450         }
 451         comm = get_context_comm(call_data);
 452         if (!comm) {
 453                 goto error;
 454         }
 455         /* optional */
 456         hostname = get_context_hostname(call_data);
 457
 458         /* find or create the current process */
 459         child = find_process_tid(&lttngtop, tid, comm);
 460         if (!child)
 461                 child = add_proc(&lttngtop, tid, comm, timestamp, hostname);
 462         if (!child)
 463                 goto end;
 464         update_proc(child, pid, tid, ppid, vpid, vtid, vppid, comm, hostname);
 465
 466         if (pid != tid) {
 467                 /* find or create the parent */
 468                 parent = find_process_tid(&lttngtop, pid, comm);
 469                 if (!parent) {
 470                         parent = add_proc(&lttngtop, pid, comm, timestamp, hostname);
 471                         if (parent)
 472                                 parent->pid = pid;
 473                 }
 474
 475                 /* attach the parent to the current process */
 476                 child->threadparent = parent;
 477                 add_thread(parent, child);
 478         }
 479
 480         update_perf_counter(child, call_data);
 481
 482 end:
 483         return BT_CB_OK;
 484
 485 error:
 486         return BT_CB_ERROR_STOP;
 487 }
 488
 489 void init_lttngtop()
 490 {
 491         copies = g_ptr_array_new();
 492         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 493         global_filter_list = g_hash_table_new(g_str_hash, g_str_equal);
 494
 495         sem_init(&goodtodisplay, 0, 0);
 496         sem_init(&goodtoupdate, 0, 1);
 497         sem_init(&timer, 0, 1);
 498         sem_init(&bootstrap, 0, 0);
 499         sem_init(&pause_sem, 0, 1);
 500         sem_init(&end_trace_sem, 0, 0);
 501
 502         reset_global_counters();
 503         lttngtop.nbproc = 0;
 504         lttngtop.nbthreads = 0;
 505         lttngtop.nbfiles = 0;
 506
 507         lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
 508                         g_direct_equal);
 509         lttngtop.process_table = g_ptr_array_new();
 510         lttngtop.files_table = g_ptr_array_new();
 511         lttngtop.cpu_table = g_ptr_array_new();
 512
 513         toggle_filter = -1;
 514 }
 515
 516 void usage(FILE *fp)
 517 {
 518         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 519         fprintf(fp, "Usage : lttngtop [OPTIONS] [TRACE]\n");
 520         fprintf(fp, "  TRACE                    Path to the trace to analyse (no trace path for live tracing)\n");
 521         fprintf(fp, "  -h, --help               This help message\n");
 522         fprintf(fp, "  -t, --textdump           Display live events in text-only\n");
 523         fprintf(fp, "  -p, --pid                Comma-separated list of PIDs to display\n");
 524         fprintf(fp, "  -f, --child              Follow threads associated with selected PIDs\n");
 525         fprintf(fp, "  -n, --hostname           Comma-separated list of hostnames to display (require hostname context in trace)\n");
 526         fprintf(fp, "  -k, --kprobes            Comma-separated list of kprobes to insert (same format as lttng enable-event)\n");
 527 }
 528
 529 /*
 530  * Parse probe options.
 531  * Shamelessly stolen from lttng-tools :
 532  * src/bin/lttng/commands/enable_events.c
 533  */
 534 static struct kprobes *parse_probe_opts(char *opt)
 535 {
 536         char s_hex[19];
 537         char name[LTTNG_SYMBOL_NAME_LEN];
 538         struct kprobes *kprobe;
 539         int ret;
 540
 541         /*
 542         kprobe->probe_addr = 0;
 543         kprobe->probe_offset = 0;
 544         asprintf(&kprobe->probe_name, "probe_sys_open");
 545         asprintf(&kprobe->symbol_name, "sys_open");
 546         */
 547
 548         if (opt == NULL) {
 549                 kprobe = NULL;
 550                 goto end;
 551         }
 552
 553         kprobe = g_new0(struct kprobes, 1);
 554
 555         /* Check for symbol+offset */
 556         ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
 557         if (ret == 2) {
 558                 asprintf(&kprobe->probe_name, "probe_%s", name);
 559                 asprintf(&kprobe->symbol_name, "%s", name);
 560
 561                 if (strlen(s_hex) == 0) {
 562                         fprintf(stderr, "Invalid probe offset %s", s_hex);
 563                         ret = -1;
 564                         goto end;
 565                 }
 566                 kprobe->probe_offset = strtoul(s_hex, NULL, 0);
 567                 kprobe->probe_addr = 0;
 568                 goto end;
 569         }
 570
 571         /* Check for symbol */
 572         if (isalpha(name[0])) {
 573                 ret = sscanf(opt, "%s", name);
 574                 if (ret == 1) {
 575                         asprintf(&kprobe->probe_name, "probe_%s", name);
 576                         asprintf(&kprobe->symbol_name, "%s", name);
 577                         kprobe->probe_offset = 0;
 578                         kprobe->probe_addr = 0;
 579                         goto end;
 580                 }
 581         }
 582
 583         /* Check for address */
 584         ret = sscanf(opt, "%s", s_hex);
 585         if (ret > 0) {
 586                 if (strlen(s_hex) == 0) {
 587                         fprintf(stderr, "Invalid probe address %s", s_hex);
 588                         ret = -1;
 589                         goto end;
 590                 }
 591                 asprintf(&kprobe->probe_name, "probe_%s", s_hex);
 592                 kprobe->probe_offset = 0;
 593                 kprobe->probe_addr = strtoul(s_hex, NULL, 0);
 594                 goto end;
 595         }
 596
 597         /* No match */
 598         kprobe = NULL;
 599
 600 end:
 601         return kprobe;
 602 }
 603
 604 /*
 605  * Return 0 if caller should continue, < 0 if caller should return
 606  * error, > 0 if caller should exit without reporting error.
 607  */
 608 static int parse_options(int argc, char **argv)
 609 {
 610         poptContext pc;
 611         int opt, ret = 0;
 612         char *tmp_str;
 613         int *tid;
 614
 615         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 616         poptReadDefaultConfig(pc, 0);
 617
 618         while ((opt = poptGetNextOpt(pc)) != -1) {
 619                 switch (opt) {
 620                         case OPT_HELP:
 621                                 usage(stdout);
 622                                 ret = 1;    /* exit cleanly */
 623                                 goto end;
 624                         case OPT_TEXTDUMP:
 625                                 opt_textdump = 1;
 626                                 break;
 627                         case OPT_CHILD:
 628                                 opt_textdump = 1;
 629                                 opt_child = 1;
 630                                 break;
 631                         case OPT_PID:
 632                                 toggle_filter = 1;
 633                                 tid_list = g_hash_table_new(g_str_hash,
 634                                                 g_str_equal);
 635                                 tmp_str = strtok(opt_tid, ",");
 636                                 while (tmp_str) {
 637                                         tid = malloc(sizeof(int));
 638                                         *tid = atoi(tmp_str);
 639                                         g_hash_table_insert(tid_list,
 640                                                         (gpointer) tid, tid);
 641                                         tmp_str = strtok(NULL, ",");
 642                                 }
 643                                 break;
 644                         case OPT_HOSTNAME:
 645                                 toggle_filter = 1;
 646                                 hostname_list = g_hash_table_new(g_str_hash,
 647                                                 g_str_equal);
 648                                 tmp_str = strtok(opt_hostname, ",");
 649                                 while (tmp_str) {
 650                                         char *new_str = strdup(tmp_str);
 651                                         g_hash_table_insert(hostname_list,
 652                                                         (gpointer) new_str,
 653                                                         (gpointer) new_str);
 654                                         tmp_str = strtok(NULL, ",");
 655                                 }
 656                                 break;
 657                         case OPT_KPROBES:
 658                                 lttngtop.kprobes_table = g_ptr_array_new();
 659                                 tmp_str = strtok(opt_kprobes, ",");
 660                                 while (tmp_str) {
 661                                         struct kprobes *kprobe;
 662
 663                                         kprobe = parse_probe_opts(tmp_str);
 664                                         if (kprobe) {
 665                                                 g_ptr_array_add(
 666                                                         lttngtop.kprobes_table,
 667                                                         kprobe);
 668                                         } else {
 669                                                 ret = -EINVAL;
 670                                                 goto end;
 671                                         }
 672                                         tmp_str = strtok(NULL, ",");
 673                                 }
 674                                 break;
 675                         default:
 676                                 ret = -EINVAL;
 677                                 goto end;
 678                 }
 679         }
 680
 681         opt_input_path = poptGetArg(pc);
 682
 683 end:
 684         if (pc) {
 685                 poptFreeContext(pc);
 686         }
 687         return ret;
 688 }
 689
 690 void iter_trace(struct bt_context *bt_ctx)
 691 {
 692         struct bt_ctf_iter *iter;
 693         struct bt_iter_pos begin_pos;
 694         struct kprobes *kprobe;
 695         const struct bt_ctf_event *event;
 696         int i;
 697         int ret = 0;
 698
 699         begin_pos.type = BT_SEEK_BEGIN;
 700         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 701
 702         /* at each event, verify the status of the process table */
 703         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 704                         fix_process_table,
 705                         NULL, NULL, NULL);
 706         if (opt_textdump) {
 707                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 708                                 print_timestamp,
 709                                 NULL, NULL, NULL);
 710         } else {
 711                 /* at each event check if we need to refresh */
 712                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 713                                 check_timestamp,
 714                                 NULL, NULL, NULL);
 715                 /* to handle the scheduling events */
 716                 bt_ctf_iter_add_callback(iter,
 717                                 g_quark_from_static_string("sched_switch"),
 718                                 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 719                 /* to clean up the process table */
 720                 bt_ctf_iter_add_callback(iter,
 721                                 g_quark_from_static_string("sched_process_free"),
 722                                 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 723                 /* to get all the process from the statedumps */
 724                 bt_ctf_iter_add_callback(iter,
 725                                 g_quark_from_static_string(
 726                                         "lttng_statedump_process_state"),
 727                                 NULL, 0, handle_statedump_process_state,
 728                                 NULL, NULL, NULL);
 729
 730                 /* for IO top */
 731                 bt_ctf_iter_add_callback(iter,
 732                                 g_quark_from_static_string("exit_syscall"),
 733                                 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 734                 bt_ctf_iter_add_callback(iter,
 735                                 g_quark_from_static_string("sys_write"),
 736                                 NULL, 0, handle_sys_write, NULL, NULL, NULL);
 737                 bt_ctf_iter_add_callback(iter,
 738                                 g_quark_from_static_string("sys_read"),
 739                                 NULL, 0, handle_sys_read, NULL, NULL, NULL);
 740                 bt_ctf_iter_add_callback(iter,
 741                                 g_quark_from_static_string("sys_open"),
 742                                 NULL, 0, handle_sys_open, NULL, NULL, NULL);
 743                 bt_ctf_iter_add_callback(iter,
 744                                 g_quark_from_static_string("sys_close"),
 745                                 NULL, 0, handle_sys_close, NULL, NULL, NULL);
 746                 bt_ctf_iter_add_callback(iter,
 747                                 g_quark_from_static_string(
 748                                         "lttng_statedump_file_descriptor"),
 749                                 NULL, 0, handle_statedump_file_descriptor,
 750                                 NULL, NULL, NULL);
 751
 752                 /* for kprobes */
 753                 if (lttngtop.kprobes_table) {
 754                         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
 755                                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
 756                                 bt_ctf_iter_add_callback(iter,
 757                                                 g_quark_from_static_string(
 758                                                         kprobe->probe_name),
 759                                                 NULL, 0, handle_kprobes,
 760                                                 NULL, NULL, NULL);
 761                         }
 762                 }
 763         }
 764
 765         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 766                 if (quit || reload_trace)
 767                         goto end_iter;
 768                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 769                 if (ret < 0)
 770                         goto end_iter;
 771         }
 772
 773         /* block until quit, we reached the end of the trace */
 774         sem_wait(&end_trace_sem);
 775
 776 end_iter:
 777         bt_ctf_iter_destroy(iter);
 778 }
 779
 780 /*
 781  * bt_context_add_traces_recursive: Open a trace recursively
 782  * (copied from BSD code in converter/babeltrace.c)
 783  *
 784  * Find each trace present in the subdirectory starting from the given
 785  * path, and add them to the context. The packet_seek parameter can be
 786  * NULL: this specify to use the default format packet_seek.
 787  *
 788  * Return: 0 on success, nonzero on failure.
 789  * Unable to open toplevel: failure.
 790  * Unable to open some subdirectory or file: warn and continue;
 791  */
 792 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 793                 const char *format_str,
 794                 void (*packet_seek)(struct bt_stream_pos *pos,
 795                         size_t offset, int whence))
 796 {
 797         FTS *tree;
 798         FTSENT *node;
 799         GArray *trace_ids;
 800         char lpath[PATH_MAX];
 801         char * const paths[2] = { lpath, NULL };
 802         int ret = -1;
 803
 804         /*
 805          * Need to copy path, because fts_open can change it.
 806          * It is the pointer array, not the strings, that are constant.
 807          */
 808         strncpy(lpath, path, PATH_MAX);
 809         lpath[PATH_MAX - 1] = '\0';
 810
 811         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 812         if (tree == NULL) {
 813                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 814                                 path);
 815                 return -EINVAL;
 816         }
 817
 818         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 819
 820         while ((node = fts_read(tree))) {
 821                 int dirfd, metafd;
 822
 823                 if (!(node->fts_info & FTS_D))
 824                         continue;
 825
 826                 dirfd = open(node->fts_accpath, 0);
 827                 if (dirfd < 0) {
 828                         fprintf(stderr, "[error] [Context] Unable to open trace "
 829                                 "directory file descriptor.\n");
 830                         ret = dirfd;
 831                         goto error;
 832                 }
 833                 metafd = openat(dirfd, "metadata", O_RDONLY);
 834                 if (metafd < 0) {
 835                         close(dirfd);
 836                         ret = -1;
 837                         continue;
 838                 } else {
 839                         int trace_id;
 840
 841                         ret = close(metafd);
 842                         if (ret < 0) {
 843                                 perror("close");
 844                                 goto error;
 845                         }
 846                         ret = close(dirfd);
 847                         if (ret < 0) {
 848                                 perror("close");
 849                                 goto error;
 850                         }
 851
 852                         trace_id = bt_context_add_trace(ctx,
 853                                 node->fts_accpath, format_str,
 854                                 packet_seek, NULL, NULL);
 855                         if (trace_id < 0) {
 856                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 857                                         "for reading.\n", node->fts_accpath, path);
 858                                 /* Allow to skip erroneous traces. */
 859                                 continue;
 860                         }
 861                         g_array_append_val(trace_ids, trace_id);
 862                 }
 863         }
 864
 865         g_array_free(trace_ids, TRUE);
 866         return ret;
 867
 868 error:
 869         return ret;
 870 }
 871
 872 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 873                 int field_cnt, int *tid_check, int *pid_check,
 874                 int *procname_check, int *ppid_check)
 875 {
 876         int j;
 877         struct perfcounter *global;
 878         const char *name;
 879
 880         for (j = 0; j < field_cnt; j++) {
 881                 name = bt_ctf_get_decl_field_name(field_list[j]);
 882                 if (*tid_check == 0) {
 883                         if (strncmp(name, "tid", 3) == 0)
 884                                 (*tid_check)++;
 885                 }
 886                 if (*pid_check == 0) {
 887                         if (strncmp(name, "pid", 3) == 0)
 888                                 (*pid_check)++;
 889                 }
 890                 if (*ppid_check == 0) {
 891                         if (strncmp(name, "ppid", 4) == 0)
 892                                 (*ppid_check)++;
 893                 }
 894                 if (*procname_check == 0) {
 895                         if (strncmp(name, "procname", 8) == 0)
 896                                 (*procname_check)++;
 897                 }
 898                 if (strncmp(name, "perf_", 5) == 0) {
 899                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 900                         if (!global) {
 901                                 global = g_new0(struct perfcounter, 1);
 902                                 /* by default, sort on the first perf context */
 903                                 if (g_hash_table_size(global_perf_liszt) == 0)
 904                                         global->sort = 1;
 905                                 global->visible = 1;
 906                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 907                         }
 908                 }
 909         }
 910
 911         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 912                         *procname_check == 1)
 913                 return 0;
 914
 915         return -1;
 916 }
 917
 918 /*
 919  * check_requirements: check if the required context informations are available
 920  *
 921  * If each mandatory context information is available for at least in one
 922  * event, return 0 otherwise return -1.
 923  */
 924 int check_requirements(struct bt_context *ctx)
 925 {
 926         unsigned int i, evt_cnt, field_cnt;
 927         struct bt_ctf_event_decl *const * evt_list;
 928         const struct bt_ctf_field_decl *const * field_list;
 929         int tid_check = 0;
 930         int pid_check = 0;
 931         int procname_check = 0;
 932         int ppid_check = 0;
 933         int ret = 0;
 934
 935         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 936         for (i = 0; i < evt_cnt; i++) {
 937                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 938                                 &field_list, &field_cnt);
 939                 ret = check_field_requirements(field_list, field_cnt,
 940                                 &tid_check, &pid_check, &procname_check,
 941                                 &ppid_check);
 942
 943                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 944                                 &field_list, &field_cnt);
 945                 ret = check_field_requirements(field_list, field_cnt,
 946                                 &tid_check, &pid_check, &procname_check,
 947                                 &ppid_check);
 948
 949                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 950                                 &field_list, &field_cnt);
 951                 ret = check_field_requirements(field_list, field_cnt,
 952                                 &tid_check, &pid_check, &procname_check,
 953                                 &ppid_check);
 954         }
 955
 956         if (tid_check == 0) {
 957                 ret = -1;
 958                 fprintf(stderr, "[error] missing tid context information\n");
 959         }
 960         if (pid_check == 0) {
 961                 ret = -1;
 962                 fprintf(stderr, "[error] missing pid context information\n");
 963         }
 964         if (ppid_check == 0) {
 965                 ret = -1;
 966                 fprintf(stderr, "[error] missing ppid context information\n");
 967         }
 968         if (procname_check == 0) {
 969                 ret = -1;
 970                 fprintf(stderr, "[error] missing procname context information\n");
 971         }
 972
 973         return ret;
 974 }
 975
 976 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 977                 struct lttng_consumer_local_data *ctx)
 978 {
 979         unsigned long len;
 980         int err;
 981         long ret = 0;
 982         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 983
 984         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 985                 /* Get the next subbuffer */
 986                 err = helper_kernctl_get_next_subbuf(infd);
 987                 if (err != 0) {
 988                         ret = errno;
 989                         perror("Reserving sub buffer failed (everything is normal, "
 990                                         "it is due to concurrency)");
 991                         goto end;
 992                 }
 993                 /* read the whole subbuffer */
 994                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 995                 if (err != 0) {
 996                         ret = errno;
 997                         perror("Getting sub-buffer len failed.");
 998                         goto end;
 999                 }
1000
1001                 /* splice the subbuffer to the tracefile */
1002                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
1003                 if (ret < 0) {
1004                         /*
1005                          * display the error but continue processing to try
1006                          * to release the subbuffer
1007                          */
1008                         fprintf(stderr,"Error splicing to tracefile\n");
1009                 }
1010                 err = helper_kernctl_put_next_subbuf(infd);
1011                 if (err != 0) {
1012                         ret = errno;
1013                         perror("Reserving sub buffer failed (everything is normal, "
1014                                         "it is due to concurrency)");
1015                         goto end;
1016                 }
1017                 sem_post(&metadata_available);
1018         }
1019
1020 end:
1021         return 0;
1022 }
1023
1024 int on_update_fd(int key, uint32_t state)
1025 {
1026         /* let the lib handle the metadata FD */
1027         if (key == sessiond_metadata)
1028                 return 0;
1029         return 1;
1030 }
1031
1032 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
1033 {
1034         int ret;
1035         struct mmap_stream *new_mmap_stream;
1036
1037         /* Opening the tracefile in write mode */
1038         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
1039                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
1040                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
1041                 if (ret < 0) {
1042                         perror("open");
1043                         goto end;
1044                 }
1045                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
1046         }
1047
1048         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
1049                 new_mmap_stream = malloc(sizeof(struct mmap_stream));
1050                 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
1051                                 kconsumerd_fd);
1052                 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1053
1054                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
1055                 /* keep mmap FDs internally */
1056                 ret = 1;
1057         } else {
1058                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
1059                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
1060                 ret = 0;
1061         }
1062
1063         reload_trace = 1;
1064
1065 end:
1066         return ret;
1067 }
1068
1069 void live_consume(struct bt_context **bt_ctx)
1070 {
1071         int ret;
1072         FILE *metadata_fp;
1073
1074         sem_wait(&metadata_available);
1075         if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
1076                 fprintf(stderr,"no metadata\n");
1077                 goto end;
1078         }
1079         metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
1080
1081         *bt_ctx = bt_context_create();
1082         ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
1083                         lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
1084         if (ret < 0) {
1085                 printf("Error adding trace\n");
1086                 goto end;
1087         }
1088
1089 end:
1090         return;
1091 }
1092
1093 int setup_consumer(char *command_sock_path, pthread_t *threads,
1094                 struct lttng_consumer_local_data *ctx)
1095 {
1096         int ret = 0;
1097
1098         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
1099                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
1100         if (!ctx)
1101                 goto end;
1102
1103         unlink(command_sock_path);
1104         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
1105         helper_lttng_consumer_init();
1106
1107         /* Create the thread to manage the receive of fd */
1108         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
1109                         (void *) ctx);
1110         if (ret != 0) {
1111                 perror("pthread_create receive fd");
1112                 goto end;
1113         }
1114         /* Create thread to manage the polling/writing of traces */
1115         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
1116                         (void *) ctx);
1117         if (ret != 0) {
1118                 perror("pthread_create poll fd");
1119                 goto end;
1120         }
1121
1122 end:
1123         return ret;
1124 }
1125
1126 int enable_kprobes(struct lttng_handle *handle, char *channel_name)
1127 {
1128         struct lttng_event ev;
1129         struct kprobes *kprobe;
1130         int ret = 0;
1131         int i;
1132
1133         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
1134                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
1135
1136                 memset(&ev, '\0', sizeof(struct lttng_event));
1137                 ev.type = LTTNG_EVENT_PROBE;
1138                 if (kprobe->symbol_name)
1139                         sprintf(ev.attr.probe.symbol_name, "%s", kprobe->symbol_name);
1140                 sprintf(ev.name, "%s", kprobe->probe_name);
1141                 ev.attr.probe.addr = kprobe->probe_addr;
1142                 ev.attr.probe.offset = kprobe->probe_offset;
1143                 if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1144                         fprintf(stderr,"error enabling kprobes : %s\n",
1145                                         helper_lttcomm_get_readable_code(ret));
1146                         goto end;
1147                 }
1148         }
1149
1150 end:
1151         return ret;
1152 }
1153
1154 int setup_live_tracing()
1155 {
1156         struct lttng_domain dom;
1157         struct lttng_channel chan;
1158         char *channel_name = "mmapchan";
1159         struct lttng_event ev;
1160         int ret = 0;
1161         char *command_sock_path = "/tmp/consumerd_sock";
1162         static pthread_t threads[2]; /* recv_fd, poll */
1163         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
1164
1165         struct lttng_handle *handle;
1166
1167         BT_INIT_LIST_HEAD(&mmap_list.head);
1168
1169         lttng_consumer_stream_array = g_ptr_array_new();
1170
1171         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
1172                 fprintf(stderr,"error setting up consumer\n");
1173                 goto error;
1174         }
1175
1176         available_snapshots = g_ptr_array_new();
1177
1178         /* setup the session */
1179         dom.type = LTTNG_DOMAIN_KERNEL;
1180
1181         ret = unlink("/tmp/livesession");
1182
1183         lttng_destroy_session("test");
1184         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
1185                 fprintf(stderr,"error creating the session : %s\n",
1186                                 helper_lttcomm_get_readable_code(ret));
1187                 goto error;
1188         }
1189
1190         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
1191                 fprintf(stderr,"error creating handle\n");
1192                 goto error_session;
1193         }
1194
1195         /*
1196          * FIXME : need to let the
1197          * helper_lttng_consumer_thread_receive_fds create the
1198          * socket.
1199          * Cleaner solution ?
1200          */
1201         while (access(command_sock_path, F_OK)) {
1202                 sleep(0.1);
1203         }
1204
1205         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
1206                 fprintf(stderr,"error registering consumer : %s\n",
1207                                 helper_lttcomm_get_readable_code(ret));
1208                 goto error_session;
1209         }
1210
1211         strcpy(chan.name, channel_name);
1212         chan.attr.overwrite = 0;
1213         if (opt_tid && opt_textdump) {
1214                 chan.attr.subbuf_size = 32768;
1215                 chan.attr.num_subbuf = 8;
1216         } else {
1217                 chan.attr.subbuf_size = 1048576; /* 1MB */
1218                 chan.attr.num_subbuf = 4;
1219         }
1220         chan.attr.switch_timer_interval = 0;
1221         chan.attr.read_timer_interval = 200;
1222         chan.attr.output = LTTNG_EVENT_MMAP;
1223
1224         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
1225                 fprintf(stderr,"error creating channel : %s\n",
1226                                 helper_lttcomm_get_readable_code(ret));
1227                 goto error_session;
1228         }
1229
1230         memset(&ev, '\0', sizeof(struct lttng_event));
1231         //sprintf(ev.name, "sched_switch");
1232         ev.type = LTTNG_EVENT_TRACEPOINT;
1233         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1234                 fprintf(stderr,"error enabling event : %s\n",
1235                                 helper_lttcomm_get_readable_code(ret));
1236                 goto error_session;
1237         }
1238
1239         memset(&ev, '\0', sizeof(struct lttng_event));
1240         ev.type = LTTNG_EVENT_SYSCALL;
1241         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1242                 fprintf(stderr,"error enabling syscalls : %s\n",
1243                                 helper_lttcomm_get_readable_code(ret));
1244                 goto error_session;
1245         }
1246
1247         if (lttngtop.kprobes_table) {
1248                 ret = enable_kprobes(handle, channel_name);
1249                 if (ret < 0) {
1250                         goto error_session;
1251                 }
1252         }
1253
1254         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
1255         lttng_add_context(handle, &kctxpid, NULL, NULL);
1256         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
1257         lttng_add_context(handle, &kctxtid, NULL, NULL);
1258         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
1259         lttng_add_context(handle, &kctxppid, NULL, NULL);
1260         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
1261         lttng_add_context(handle, &kctxcomm, NULL, NULL);
1262         kctxpid.ctx = LTTNG_EVENT_CONTEXT_VPID;
1263         lttng_add_context(handle, &kctxpid, NULL, NULL);
1264         kctxtid.ctx = LTTNG_EVENT_CONTEXT_VTID;
1265         lttng_add_context(handle, &kctxtid, NULL, NULL);
1266         kctxtid.ctx = LTTNG_EVENT_CONTEXT_HOSTNAME;
1267         lttng_add_context(handle, &kctxtid, NULL, NULL);
1268
1269         if ((ret = lttng_start_tracing("test")) < 0) {
1270                 fprintf(stderr,"error starting tracing : %s\n",
1271                                 helper_lttcomm_get_readable_code(ret));
1272                 goto error_session;
1273         }
1274
1275         helper_kernctl_buffer_flush(consumerd_metadata);
1276
1277         /* block until metadata is ready */
1278         sem_init(&metadata_available, 0, 0);
1279
1280         return 0;
1281
1282 error_session:
1283         lttng_destroy_session("test");
1284 error:
1285         return -1;
1286 }
1287
1288 int main(int argc, char **argv)
1289 {
1290         int ret;
1291         struct bt_context *bt_ctx = NULL;
1292         struct mmap_stream *mmap_info;
1293         unsigned long mmap_len;
1294
1295         init_lttngtop();
1296         ret = parse_options(argc, argv);
1297         if (ret < 0) {
1298                 fprintf(stdout, "Error parsing options.\n\n");
1299                 usage(stdout);
1300                 exit(EXIT_FAILURE);
1301         } else if (ret > 0) {
1302                 exit(EXIT_SUCCESS);
1303         }
1304
1305         if (!opt_input_path) {
1306                 if (opt_textdump) {
1307                         signal(SIGTERM, handle_textdump_sigterm);
1308                         signal(SIGINT, handle_textdump_sigterm);
1309                 }
1310                 ret = setup_live_tracing();
1311                 if (ret < 0) {
1312                         goto end;
1313                 }
1314                 if (!opt_textdump) {
1315                         pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1316                         pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1317                 }
1318                 while (!quit) {
1319                         reload_trace = 0;
1320                         live_consume(&bt_ctx);
1321                         iter_trace(bt_ctx);
1322                         ret = bt_context_remove_trace(bt_ctx, 0);
1323                         if (ret != 0)
1324                                 fprintf(stderr, "error removing trace\n");
1325                         if (bt_ctx) {
1326                                 bt_context_put(bt_ctx);
1327                         }
1328
1329                         /*
1330                          * since we receive all FDs every time there is an
1331                          * update and the FD number is different every time,
1332                          * we don't know which one are valid.
1333                          * so we check if all FDs are usable with a simple
1334                          * ioctl call.
1335                          */
1336                         bt_list_for_each_entry(mmap_info, &mmap_list.head, list) {
1337                                 ret = helper_kernctl_get_mmap_len(mmap_info->fd, &mmap_len);
1338                                 if (ret != 0) {
1339                                         bt_list_del(&mmap_info->list);
1340                                 }
1341                         }
1342                         sem_post(&metadata_available);
1343                 }
1344
1345                 pthread_join(timer_thread, NULL);
1346                 quit = 1;
1347                 pthread_join(display_thread, NULL);
1348
1349                 lttng_stop_tracing("test");
1350                 lttng_destroy_session("test");
1351
1352                 goto end;
1353         } else {
1354                 //init_lttngtop();
1355
1356                 bt_ctx = bt_context_create();
1357                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1358                 if (ret < 0) {
1359                         fprintf(stderr, "[error] Opening the trace\n");
1360                         goto end;
1361                 }
1362
1363                 ret = check_requirements(bt_ctx);
1364                 if (ret < 0) {
1365                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1366                         goto end;
1367                 }
1368                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1369                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1370
1371                 iter_trace(bt_ctx);
1372
1373                 pthread_join(display_thread, NULL);
1374                 quit = 1;
1375                 pthread_join(timer_thread, NULL);
1376         }
1377
1378 end:
1379         if (bt_ctx)
1380                 bt_context_put(bt_ctx);
1381
1382         return 0;
1383 }