src/lttngtop.c

   1 /*
   2  * Copyright (C) 2013 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 #ifdef LTTNGTOP_MMAP_LIVE
  43 #include <lttng/lttngtop-helper.h>
  44 #include <babeltrace/lttngtopmmappacketseek.h>
  45 #include "mmap-live.h"
  46 #endif /* LTTNGTOP_MMAP_LIVE */
  47
  48 #include "lttngtoptypes.h"
  49 #include "cputop.h"
  50 #include "iostreamtop.h"
  51 #include "cursesdisplay.h"
  52 #include "common.h"
  53 #include "network-live.h"
  54
  55 #define NET_URL_PREFIX  "net://"
  56 #define NET4_URL_PREFIX "net4://"
  57 #define NET6_URL_PREFIX "net6://"
  58
  59 #define DEFAULT_FILE_ARRAY_SIZE 1
  60
  61 const char *opt_input_path;
  62 int opt_textdump;
  63 int opt_child;
  64 int opt_begin;
  65
  66 int quit = 0;
  67
  68 struct lttngtop *copy;
  69 pthread_t display_thread;
  70 pthread_t timer_thread;
  71
  72 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  73 unsigned long last_display_update = 0;
  74 unsigned long last_event_ts = 0;
  75
  76 /* list of FDs available for being read with snapshots */
  77 struct bt_mmap_stream_list mmap_list;
  78 GPtrArray *lttng_consumer_stream_array;
  79 int sessiond_metadata, consumerd_metadata;
  80 struct lttng_consumer_local_data *ctx = NULL;
  81 /* list of snapshots currently not consumed */
  82 GPtrArray *available_snapshots;
  83 sem_t metadata_available;
  84 int reload_trace = 0;
  85
  86 enum {
  87         OPT_NONE = 0,
  88         OPT_HELP,
  89         OPT_TEXTDUMP,
  90         OPT_PID,
  91         OPT_CHILD,
  92         OPT_HOSTNAME,
  93         OPT_RELAY_HOSTNAME,
  94         OPT_KPROBES,
  95         OPT_BEGIN,
  96 };
  97
  98 static struct poptOption long_options[] = {
  99         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
 100         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
 101         { "textdump", 't', POPT_ARG_NONE, NULL, OPT_TEXTDUMP, NULL, NULL },
 102         { "child", 'f', POPT_ARG_NONE, NULL, OPT_CHILD, NULL, NULL },
 103         { "begin", 'b', POPT_ARG_NONE, NULL, OPT_BEGIN, NULL, NULL },
 104         { "pid", 'p', POPT_ARG_STRING, &opt_tid, OPT_PID, NULL, NULL },
 105         { "hostname", 'n', POPT_ARG_STRING, &opt_hostname, OPT_HOSTNAME, NULL, NULL },
 106         { "relay-hostname", 'r', POPT_ARG_STRING, &opt_relay_hostname,
 107                 OPT_RELAY_HOSTNAME, NULL, NULL },
 108         { "kprobes", 'k', POPT_ARG_STRING, &opt_kprobes, OPT_KPROBES, NULL, NULL },
 109         { NULL, 0, 0, NULL, 0, NULL, NULL },
 110 };
 111
 112 #ifdef LTTNGTOP_MMAP_LIVE
 113 static void handle_textdump_sigterm(int signal)
 114 {
 115         quit = 1;
 116         lttng_destroy_session("test");
 117 }
 118 #endif
 119
 120 void *refresh_thread(void *p)
 121 {
 122         while (1) {
 123                 if (quit) {
 124                         sem_post(&pause_sem);
 125                         sem_post(&timer);
 126                         sem_post(&end_trace_sem);
 127                         sem_post(&goodtodisplay);
 128                         sem_post(&goodtoupdate);
 129                         pthread_exit(0);
 130                 }
 131                 if (!opt_input_path) {
 132 #ifdef LTTNGTOP_MMAP_LIVE
 133                         mmap_live_flush(mmap_list);
 134 #endif
 135                 }
 136                 sem_wait(&pause_sem);
 137                 sem_post(&pause_sem);
 138                 sem_post(&timer);
 139                 sleep(refresh_display/NSEC_PER_SEC);
 140         }
 141 }
 142
 143 void *ncurses_display(void *p)
 144 {
 145         unsigned int current_display_index = 0;
 146
 147         sem_wait(&bootstrap);
 148         /*
 149          * Prevent the 1 second delay when we hit ESC
 150          */
 151         ESCDELAY = 0;
 152         init_ncurses();
 153
 154         while (1) {
 155                 sem_wait(&timer);
 156                 sem_wait(&goodtodisplay);
 157                 sem_wait(&pause_sem);
 158
 159                 if (quit) {
 160                         sem_post(&pause_sem);
 161                         sem_post(&timer);
 162                         reset_ncurses();
 163                         pthread_exit(0);
 164                 }
 165
 166                 copy = g_ptr_array_index(copies, current_display_index);
 167                 assert(copy);
 168                 display(current_display_index++);
 169
 170                 sem_post(&goodtoupdate);
 171                 sem_post(&pause_sem);
 172         }
 173 }
 174
 175 void print_fields(struct bt_ctf_event *event)
 176 {
 177         unsigned int cnt, i;
 178         const struct bt_definition *const * list;
 179         const struct bt_declaration *l;
 180         const struct bt_definition *scope;
 181         enum ctf_type_id type;
 182         const char *str;
 183
 184         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_FIELDS);
 185
 186         bt_ctf_get_field_list(event, scope, &list, &cnt);
 187         for (i = 0; i < cnt; i++) {
 188                 if (i != 0)
 189                         printf(", ");
 190                 printf("%s = ", bt_ctf_field_name(list[i]));
 191                 l = bt_ctf_get_decl_from_def(list[i]);
 192                 type = bt_ctf_field_type(l);
 193                 if (type == CTF_TYPE_INTEGER) {
 194                         if (bt_ctf_get_int_signedness(l) == 0)
 195                                 printf("%" PRIu64 "", bt_ctf_get_uint64(list[i]));
 196                         else
 197                                 printf("%" PRId64 "", bt_ctf_get_int64(list[i]));
 198                 } else if (type == CTF_TYPE_STRING) {
 199                         printf("%s", bt_ctf_get_string(list[i]));
 200                 } else if (type == CTF_TYPE_ARRAY) {
 201                         str = bt_ctf_get_char_array(list[i]);
 202                         if (!bt_ctf_field_get_error() && str)
 203                                 printf("%s", str);
 204                 }
 205         }
 206 }
 207
 208 /*
 209  * hook on each event to check the timestamp and refresh the display if
 210  * necessary
 211  */
 212 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
 213 {
 214         unsigned long timestamp;
 215         struct tm start;
 216         uint64_t ts_nsec_start;
 217         int pid, cpu_id, tid;
 218         const struct bt_definition *scope;
 219         const char *hostname, *procname;
 220
 221         timestamp = bt_ctf_get_timestamp(call_data);
 222
 223         /* can happen in network live when tracing is idle */
 224         if (timestamp < last_event_ts)
 225                 goto end_stop;
 226
 227         last_event_ts = timestamp;
 228
 229         start = format_timestamp(timestamp);
 230         ts_nsec_start = timestamp % NSEC_PER_SEC;
 231
 232         pid = get_context_pid(call_data);
 233         if (pid == -1ULL && opt_tid) {
 234                 goto error;
 235         }
 236
 237         tid = get_context_tid(call_data);
 238
 239         hostname = get_context_hostname(call_data);
 240         if (opt_tid || opt_hostname) {
 241                 if (!lookup_filter_tid_list(pid)) {
 242                         /* To display when a process of ours in getting scheduled in */
 243                         if (strcmp(bt_ctf_event_name(call_data), "sched_switch") == 0) {
 244                                 int next_tid;
 245
 246                                 scope = bt_ctf_get_top_level_scope(call_data,
 247                                                 BT_EVENT_FIELDS);
 248                                 next_tid = bt_ctf_get_int64(bt_ctf_get_field(call_data,
 249                                                         scope, "_next_tid"));
 250                                 if (bt_ctf_field_get_error()) {
 251                                         fprintf(stderr, "Missing next_tid field\n");
 252                                         goto error;
 253                                 }
 254                                 if (!lookup_filter_tid_list(next_tid)) {
 255                                         goto end;
 256                                 }
 257                         } else {
 258                                 goto end;
 259                         }
 260                 }
 261         }
 262
 263         cpu_id = get_cpu_id(call_data);
 264         procname = get_context_comm(call_data);
 265
 266         if (hostname) {
 267                 printf("%02d:%02d:%02d.%09" PRIu64 " (%s) (cpu %d) [%s (%d/%d)] %s (",
 268                                 start.tm_hour, start.tm_min, start.tm_sec,
 269                                 ts_nsec_start, hostname, cpu_id, procname, pid,
 270                                 tid, bt_ctf_event_name(call_data));
 271         } else {
 272                 printf("%02d:%02d:%02d.%09" PRIu64 " (cpu %d) [%s (%d/%d)] %s (",
 273                                 start.tm_hour, start.tm_min, start.tm_sec,
 274                                 ts_nsec_start, cpu_id, procname, pid, tid,
 275                                 bt_ctf_event_name(call_data));
 276         }
 277         print_fields(call_data);
 278         printf(")\n");
 279
 280 end:
 281         return BT_CB_OK;
 282 error:
 283         return BT_CB_ERROR_STOP;
 284 end_stop:
 285         return BT_CB_OK_STOP;
 286 }
 287
 288 enum bt_cb_ret handle_kprobes(struct bt_ctf_event *call_data, void *private_data)
 289 {
 290         int i;
 291         struct kprobes *kprobe;
 292
 293         /* for kprobes */
 294         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
 295                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
 296                 if (strcmp(bt_ctf_event_name(call_data), kprobe->probe_name) == 0) {
 297                         kprobe->count++;
 298                 }
 299         }
 300
 301         return BT_CB_OK;
 302 }
 303
 304 /*
 305  * hook on each event to check the timestamp and refresh the display if
 306  * necessary
 307  */
 308 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 309 {
 310         unsigned long timestamp;
 311
 312         timestamp = bt_ctf_get_timestamp(call_data);
 313         if (timestamp == -1ULL)
 314                 goto error;
 315
 316         /* can happen in network live when tracing is idle */
 317         if (timestamp < last_event_ts)
 318                 goto end_stop;
 319
 320         last_event_ts = timestamp;
 321
 322         if (last_display_update == 0)
 323                 last_display_update = timestamp;
 324
 325         if (timestamp - last_display_update >= refresh_display) {
 326                 sem_wait(&goodtoupdate);
 327                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 328                                         timestamp));
 329                 sem_post(&goodtodisplay);
 330                 sem_post(&bootstrap);
 331                 last_display_update = timestamp;
 332         }
 333         return BT_CB_OK;
 334
 335 error:
 336         fprintf(stderr, "check_timestamp callback error\n");
 337         return BT_CB_ERROR_STOP;
 338
 339 end_stop:
 340         return BT_CB_OK_STOP;
 341 }
 342
 343 /*
 344  * get_perf_counter : get or create and return a perf_counter struct for
 345  * either a process or a cpu (only one of the 2 parameters mandatory)
 346  */
 347 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 348                 struct cputime *cpu)
 349 {
 350         struct perfcounter *ret;
 351         GHashTable *table;
 352
 353         if (proc)
 354                 table = proc->perf;
 355         else if (cpu)
 356                 table = cpu->perf;
 357         else
 358                 goto error;
 359
 360         ret = g_hash_table_lookup(table, (gpointer) name);
 361         if (ret)
 362                 goto end;
 363
 364         ret = g_new0(struct perfcounter, 1);
 365         /* by default, make it visible in the UI */
 366         ret->visible = 1;
 367         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 368
 369 end:
 370         return ret;
 371
 372 error:
 373         return NULL;
 374 }
 375
 376 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 377                 const char *name, int value)
 378 {
 379         struct perfcounter *cpu_perf, *process_perf;
 380
 381         cpu_perf = get_perf_counter(name, NULL, cpu);
 382         if (cpu_perf->count < value) {
 383                 process_perf = get_perf_counter(name, proc, NULL);
 384                 process_perf->count += value - cpu_perf->count;
 385                 cpu_perf->count = value;
 386         }
 387 }
 388
 389 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 390                 const struct bt_definition *scope,
 391                 struct processtop *proc,
 392                 struct cputime *cpu)
 393 {
 394         struct bt_definition const * const *list = NULL;
 395         const struct bt_definition *field;
 396         unsigned int count;
 397         struct perfcounter *perfcounter;
 398         GHashTableIter iter;
 399         gpointer key;
 400         int ret;
 401
 402         if (!scope)
 403                 goto end;
 404
 405         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 406         if (ret < 0)
 407                 goto end;
 408
 409         if (count == 0)
 410                 goto end;
 411
 412         g_hash_table_iter_init(&iter, global_perf_liszt);
 413         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 414                 field = bt_ctf_get_field(event, scope, (char *) key);
 415                 if (field) {
 416                         int value = bt_ctf_get_uint64(field);
 417                         if (bt_ctf_field_get_error())
 418                                 continue;
 419                         update_perf_value(proc, cpu, (char *) key, value);
 420                 }
 421         }
 422
 423 end:
 424         return;
 425 }
 426
 427 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 428 {
 429         struct cputime *cpu;
 430         const struct bt_definition *scope;
 431
 432         cpu = get_cpu(get_cpu_id(event));
 433
 434         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 435         extract_perf_counter_scope(event, scope, proc, cpu);
 436
 437         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 438         extract_perf_counter_scope(event, scope, proc, cpu);
 439
 440         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 441         extract_perf_counter_scope(event, scope, proc, cpu);
 442 }
 443
 444 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 445                 void *private_data)
 446 {
 447         int pid, tid, ppid, vpid, vtid, vppid;
 448         char *comm, *hostname;
 449         struct processtop *parent, *child;
 450         unsigned long timestamp;
 451
 452         timestamp = bt_ctf_get_timestamp(call_data);
 453         if (timestamp == -1ULL)
 454                 goto error;
 455
 456         pid = get_context_pid(call_data);
 457         if (pid == -1ULL) {
 458                 goto error;
 459         }
 460
 461         tid = get_context_tid(call_data);
 462         if (tid == -1ULL) {
 463                 goto error;
 464         }
 465         ppid = get_context_ppid(call_data);
 466         if (ppid == -1ULL) {
 467                 goto error;
 468         }
 469         vpid = get_context_vpid(call_data);
 470         if (pid == -1ULL) {
 471                 vpid = -1;
 472         }
 473         vtid = get_context_vtid(call_data);
 474         if (tid == -1ULL) {
 475                 vtid = -1;
 476         }
 477         vppid = get_context_vppid(call_data);
 478         if (ppid == -1ULL) {
 479                 vppid = -1;
 480         }
 481         comm = get_context_comm(call_data);
 482         if (!comm) {
 483                 goto error;
 484         }
 485         /* optional */
 486         hostname = get_context_hostname(call_data);
 487
 488         /* find or create the current process */
 489         child = find_process_tid(&lttngtop, tid, comm);
 490         if (!child)
 491                 child = add_proc(&lttngtop, tid, comm, timestamp, hostname);
 492         if (!child)
 493                 goto end;
 494         update_proc(child, pid, tid, ppid, vpid, vtid, vppid, comm, hostname);
 495
 496         if (pid != tid) {
 497                 /* find or create the parent */
 498                 parent = find_process_tid(&lttngtop, pid, comm);
 499                 if (!parent) {
 500                         parent = add_proc(&lttngtop, pid, comm, timestamp, hostname);
 501                         if (parent)
 502                                 parent->pid = pid;
 503                 }
 504
 505                 /* attach the parent to the current process */
 506                 child->threadparent = parent;
 507                 add_thread(parent, child);
 508         }
 509
 510         update_perf_counter(child, call_data);
 511
 512 end:
 513         return BT_CB_OK;
 514
 515 error:
 516         return BT_CB_ERROR_STOP;
 517 }
 518
 519 void init_lttngtop()
 520 {
 521         copies = g_ptr_array_new();
 522         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 523         global_filter_list = g_hash_table_new(g_str_hash, g_str_equal);
 524         global_host_list = g_hash_table_new(g_str_hash, g_str_equal);
 525
 526         sem_init(&goodtodisplay, 0, 0);
 527         sem_init(&goodtoupdate, 0, 1);
 528         sem_init(&timer, 0, 1);
 529         sem_init(&bootstrap, 0, 0);
 530         sem_init(&pause_sem, 0, 1);
 531         sem_init(&end_trace_sem, 0, 0);
 532
 533         reset_global_counters();
 534         lttngtop.nbproc = 0;
 535         lttngtop.nbthreads = 0;
 536         lttngtop.nbfiles = 0;
 537
 538         lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
 539                         g_direct_equal);
 540         lttngtop.process_table = g_ptr_array_new();
 541         lttngtop.files_table = g_ptr_array_new();
 542         lttngtop.cpu_table = g_ptr_array_new();
 543
 544         toggle_filter = -1;
 545 }
 546
 547 void usage(FILE *fp)
 548 {
 549         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 550         fprintf(fp, "Usage : lttngtop [OPTIONS] TRACE\n");
 551         fprintf(fp, "  TRACE                    Path to the trace to analyse (-r for network live tracing, nothing for mmap live streaming)\n");
 552         fprintf(fp, "  -h, --help               This help message\n");
 553         fprintf(fp, "  -t, --textdump           Display live events in text-only\n");
 554         fprintf(fp, "  -p, --pid                Comma-separated list of PIDs to display\n");
 555         fprintf(fp, "  -f, --child              Follow threads associated with selected PIDs\n");
 556         fprintf(fp, "  -n, --hostname           Comma-separated list of hostnames to display (require hostname context in trace)\n");
 557         fprintf(fp, "  -k, --kprobes            Comma-separated list of kprobes to insert (same format as lttng enable-event)\n");
 558         fprintf(fp, "  -r, --relay-hostname     Network live streaming : hostname of the lttng-relayd (default port)\n");
 559         fprintf(fp, "  -b, --begin              Network live streaming : read the trace for the beginning of the recording\n");
 560 }
 561
 562 /*
 563  * Parse probe options.
 564  * Shamelessly stolen from lttng-tools :
 565  * src/bin/lttng/commands/enable_events.c
 566  */
 567 static struct kprobes *parse_probe_opts(char *opt)
 568 {
 569         char s_hex[19];
 570         char name[LTTNG_SYMBOL_NAME_LEN];
 571         struct kprobes *kprobe;
 572         int ret;
 573
 574         /*
 575         kprobe->probe_addr = 0;
 576         kprobe->probe_offset = 0;
 577         asprintf(&kprobe->probe_name, "probe_sys_open");
 578         asprintf(&kprobe->symbol_name, "sys_open");
 579         */
 580
 581         if (opt == NULL) {
 582                 kprobe = NULL;
 583                 goto end;
 584         }
 585
 586         kprobe = g_new0(struct kprobes, 1);
 587
 588         /* Check for symbol+offset */
 589         ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
 590         if (ret == 2) {
 591                 ret = asprintf(&kprobe->probe_name, "probe_%s", name);
 592                 ret = asprintf(&kprobe->symbol_name, "%s", name);
 593
 594                 if (strlen(s_hex) == 0) {
 595                         fprintf(stderr, "Invalid probe offset %s", s_hex);
 596                         ret = -1;
 597                         goto end;
 598                 }
 599                 kprobe->probe_offset = strtoul(s_hex, NULL, 0);
 600                 kprobe->probe_addr = 0;
 601                 goto end;
 602         }
 603
 604         /* Check for symbol */
 605         if (isalpha(name[0])) {
 606                 ret = sscanf(opt, "%s", name);
 607                 if (ret == 1) {
 608                         ret = asprintf(&kprobe->probe_name, "probe_%s", name);
 609                         ret = asprintf(&kprobe->symbol_name, "%s", name);
 610                         kprobe->probe_offset = 0;
 611                         kprobe->probe_addr = 0;
 612                         goto end;
 613                 }
 614         }
 615
 616         /* Check for address */
 617         ret = sscanf(opt, "%s", s_hex);
 618         if (ret > 0) {
 619                 if (strlen(s_hex) == 0) {
 620                         fprintf(stderr, "Invalid probe address %s", s_hex);
 621                         ret = -1;
 622                         goto end;
 623                 }
 624                 ret = asprintf(&kprobe->probe_name, "probe_%s", s_hex);
 625                 kprobe->probe_offset = 0;
 626                 kprobe->probe_addr = strtoul(s_hex, NULL, 0);
 627                 goto end;
 628         }
 629
 630         /* No match */
 631         kprobe = NULL;
 632
 633 end:
 634         return kprobe;
 635 }
 636
 637 /*
 638  * Return 0 if caller should continue, < 0 if caller should return
 639  * error, > 0 if caller should exit without reporting error.
 640  */
 641 static int parse_options(int argc, char **argv)
 642 {
 643         poptContext pc;
 644         int opt, ret = 0;
 645         char *tmp_str;
 646         int *tid;
 647
 648         remote_live = 0;
 649
 650         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 651         poptReadDefaultConfig(pc, 0);
 652
 653         while ((opt = poptGetNextOpt(pc)) != -1) {
 654                 switch (opt) {
 655                         case OPT_HELP:
 656                                 usage(stdout);
 657                                 ret = 1;    /* exit cleanly */
 658                                 goto end;
 659                         case OPT_TEXTDUMP:
 660                                 opt_textdump = 1;
 661                                 break;
 662                         case OPT_CHILD:
 663                                 opt_child = 1;
 664                                 break;
 665                         case OPT_PID:
 666                                 toggle_filter = 1;
 667                                 tid_filter_list = g_hash_table_new(g_str_hash,
 668                                                 g_str_equal);
 669                                 tmp_str = strtok(opt_tid, ",");
 670                                 while (tmp_str) {
 671                                         tid = malloc(sizeof(int));
 672                                         *tid = atoi(tmp_str);
 673                                         g_hash_table_insert(tid_filter_list,
 674                                                         (gpointer) tid, tid);
 675                                         tmp_str = strtok(NULL, ",");
 676                                 }
 677                                 break;
 678                         case OPT_BEGIN:
 679                                 /* start reading the live trace from the beginning */
 680                                 opt_begin = 1;
 681                                 break;
 682                         case OPT_HOSTNAME:
 683                                 toggle_filter = 1;
 684                                 tmp_str = strtok(opt_hostname, ",");
 685                                 while (tmp_str) {
 686                                         add_hostname_list(tmp_str, 1);
 687                                         tmp_str = strtok(NULL, ",");
 688                                 }
 689                                 break;
 690                         case OPT_RELAY_HOSTNAME:
 691                                 remote_live = 1;
 692                                 break;
 693                         case OPT_KPROBES:
 694                                 lttngtop.kprobes_table = g_ptr_array_new();
 695                                 tmp_str = strtok(opt_kprobes, ",");
 696                                 while (tmp_str) {
 697                                         struct kprobes *kprobe;
 698
 699                                         kprobe = parse_probe_opts(tmp_str);
 700                                         if (kprobe) {
 701                                                 g_ptr_array_add(
 702                                                         lttngtop.kprobes_table,
 703                                                         kprobe);
 704                                         } else {
 705                                                 ret = -EINVAL;
 706                                                 goto end;
 707                                         }
 708                                         tmp_str = strtok(NULL, ",");
 709                                 }
 710                                 break;
 711                         default:
 712                                 ret = -EINVAL;
 713                                 goto end;
 714                 }
 715         }
 716
 717         opt_input_path = poptGetArg(pc);
 718
 719 end:
 720         if (pc) {
 721                 poptFreeContext(pc);
 722         }
 723         return ret;
 724 }
 725
 726 void iter_trace(struct bt_context *bt_ctx)
 727 {
 728         struct bt_ctf_iter *iter;
 729         struct bt_iter_pos begin_pos;
 730         struct kprobes *kprobe;
 731         const struct bt_ctf_event *event;
 732         int i;
 733         int ret = 0;
 734
 735         begin_pos.type = BT_SEEK_BEGIN;
 736         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 737
 738         /* at each event, verify the status of the process table */
 739         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 740                         fix_process_table,
 741                         NULL, NULL, NULL);
 742         /* to handle the follow child option */
 743         bt_ctf_iter_add_callback(iter,
 744                         g_quark_from_static_string("sched_process_fork"),
 745                         NULL, 0, handle_sched_process_fork, NULL, NULL, NULL);
 746         if (opt_textdump) {
 747                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 748                                 print_timestamp,
 749                                 NULL, NULL, NULL);
 750         } else {
 751                 /* at each event check if we need to refresh */
 752                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 753                                 check_timestamp,
 754                                 NULL, NULL, NULL);
 755                 /* to handle the scheduling events */
 756                 bt_ctf_iter_add_callback(iter,
 757                                 g_quark_from_static_string("sched_switch"),
 758                                 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 759                 /* to clean up the process table */
 760                 bt_ctf_iter_add_callback(iter,
 761                                 g_quark_from_static_string("sched_process_free"),
 762                                 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 763                 /* to get all the process from the statedumps */
 764                 bt_ctf_iter_add_callback(iter,
 765                                 g_quark_from_static_string(
 766                                         "lttng_statedump_process_state"),
 767                                 NULL, 0, handle_statedump_process_state,
 768                                 NULL, NULL, NULL);
 769
 770                 /* for IO top */
 771                 bt_ctf_iter_add_callback(iter,
 772                                 g_quark_from_static_string("exit_syscall"),
 773                                 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 774                 bt_ctf_iter_add_callback(iter,
 775                                 g_quark_from_static_string("sys_write"),
 776                                 NULL, 0, handle_sys_write, NULL, NULL, NULL);
 777                 bt_ctf_iter_add_callback(iter,
 778                                 g_quark_from_static_string("sys_read"),
 779                                 NULL, 0, handle_sys_read, NULL, NULL, NULL);
 780                 bt_ctf_iter_add_callback(iter,
 781                                 g_quark_from_static_string("sys_open"),
 782                                 NULL, 0, handle_sys_open, NULL, NULL, NULL);
 783                 bt_ctf_iter_add_callback(iter,
 784                                 g_quark_from_static_string("sys_close"),
 785                                 NULL, 0, handle_sys_close, NULL, NULL, NULL);
 786                 bt_ctf_iter_add_callback(iter,
 787                                 g_quark_from_static_string(
 788                                         "lttng_statedump_file_descriptor"),
 789                                 NULL, 0, handle_statedump_file_descriptor,
 790                                 NULL, NULL, NULL);
 791
 792                 /* for kprobes */
 793                 if (lttngtop.kprobes_table) {
 794                         for (i = 0; i < lttngtop.kprobes_table->len; i++) {
 795                                 kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
 796                                 bt_ctf_iter_add_callback(iter,
 797                                                 g_quark_from_static_string(
 798                                                         kprobe->probe_name),
 799                                                 NULL, 0, handle_kprobes,
 800                                                 NULL, NULL, NULL);
 801                         }
 802                 }
 803         }
 804
 805         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 806                 if (quit || reload_trace)
 807                         goto end_iter;
 808                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 809                 if (ret < 0)
 810                         goto end_iter;
 811         }
 812
 813         /* block until quit, we reached the end of the trace */
 814         sem_wait(&end_trace_sem);
 815
 816 end_iter:
 817         bt_ctf_iter_destroy(iter);
 818 }
 819
 820 /*
 821  * bt_context_add_traces_recursive: Open a trace recursively
 822  * (copied from BSD code in converter/babeltrace.c)
 823  *
 824  * Find each trace present in the subdirectory starting from the given
 825  * path, and add them to the context. The packet_seek parameter can be
 826  * NULL: this specify to use the default format packet_seek.
 827  *
 828  * Return: 0 on success, nonzero on failure.
 829  * Unable to open toplevel: failure.
 830  * Unable to open some subdirectory or file: warn and continue;
 831  */
 832 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 833                 const char *format_str,
 834                 void (*packet_seek)(struct bt_stream_pos *pos,
 835                         size_t offset, int whence))
 836 {
 837         FTS *tree;
 838         FTSENT *node;
 839         GArray *trace_ids;
 840         char lpath[PATH_MAX];
 841         char * const paths[2] = { lpath, NULL };
 842         int ret = -1;
 843
 844         if ((strncmp(path, NET4_URL_PREFIX, sizeof(NET4_URL_PREFIX) - 1)) == 0 ||
 845                         (strncmp(path, NET6_URL_PREFIX, sizeof(NET6_URL_PREFIX) - 1)) == 0 ||
 846                         (strncmp(path, NET_URL_PREFIX, sizeof(NET_URL_PREFIX) - 1)) == 0) {
 847                 ret = bt_context_add_trace(ctx,
 848                                 path, format_str, packet_seek, NULL, NULL);
 849                 if (ret < 0) {
 850                         fprintf(stderr, "[warning] [Context] cannot open trace \"%s\" "
 851                                         "for reading.\n", path);
 852                         /* Allow to skip erroneous traces. */
 853                         ret = 1;        /* partial error */
 854                 }
 855                 return ret;
 856         }
 857         /*
 858          * Need to copy path, because fts_open can change it.
 859          * It is the pointer array, not the strings, that are constant.
 860          */
 861         strncpy(lpath, path, PATH_MAX);
 862         lpath[PATH_MAX - 1] = '\0';
 863
 864         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 865         if (tree == NULL) {
 866                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 867                                 path);
 868                 return -EINVAL;
 869         }
 870
 871         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 872
 873         while ((node = fts_read(tree))) {
 874                 int dirfd, metafd;
 875
 876                 if (!(node->fts_info & FTS_D))
 877                         continue;
 878
 879                 dirfd = open(node->fts_accpath, 0);
 880                 if (dirfd < 0) {
 881                         fprintf(stderr, "[error] [Context] Unable to open trace "
 882                                 "directory file descriptor.\n");
 883                         ret = dirfd;
 884                         goto error;
 885                 }
 886                 metafd = openat(dirfd, "metadata", O_RDONLY);
 887                 if (metafd < 0) {
 888                         close(dirfd);
 889                         continue;
 890                 } else {
 891                         int trace_id;
 892
 893                         ret = close(metafd);
 894                         if (ret < 0) {
 895                                 perror("close");
 896                                 goto error;
 897                         }
 898                         ret = close(dirfd);
 899                         if (ret < 0) {
 900                                 perror("close");
 901                                 goto error;
 902                         }
 903
 904                         trace_id = bt_context_add_trace(ctx,
 905                                 node->fts_accpath, format_str,
 906                                 packet_seek, NULL, NULL);
 907                         if (trace_id < 0) {
 908                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 909                                         "for reading.\n", node->fts_accpath, path);
 910                                 /* Allow to skip erroneous traces. */
 911                                 continue;
 912                         }
 913                         g_array_append_val(trace_ids, trace_id);
 914                 }
 915         }
 916
 917         g_array_free(trace_ids, TRUE);
 918         return ret;
 919
 920 error:
 921         return ret;
 922 }
 923
 924 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 925                 int field_cnt, int *tid_check, int *pid_check,
 926                 int *procname_check, int *ppid_check)
 927 {
 928         int j;
 929         struct perfcounter *global;
 930         const char *name;
 931
 932         for (j = 0; j < field_cnt; j++) {
 933                 name = bt_ctf_get_decl_field_name(field_list[j]);
 934                 if (*tid_check == 0) {
 935                         if (strncmp(name, "tid", 3) == 0)
 936                                 (*tid_check)++;
 937                 }
 938                 if (*pid_check == 0) {
 939                         if (strncmp(name, "pid", 3) == 0)
 940                                 (*pid_check)++;
 941                 }
 942                 if (*ppid_check == 0) {
 943                         if (strncmp(name, "ppid", 4) == 0)
 944                                 (*ppid_check)++;
 945                 }
 946                 if (*procname_check == 0) {
 947                         if (strncmp(name, "procname", 8) == 0)
 948                                 (*procname_check)++;
 949                 }
 950                 if (strncmp(name, "perf_", 5) == 0) {
 951                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 952                         if (!global) {
 953                                 global = g_new0(struct perfcounter, 1);
 954                                 /* by default, sort on the first perf context */
 955                                 if (g_hash_table_size(global_perf_liszt) == 0)
 956                                         global->sort = 1;
 957                                 global->visible = 1;
 958                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 959                         }
 960                 }
 961         }
 962
 963         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 964                         *procname_check == 1)
 965                 return 0;
 966
 967         return -1;
 968 }
 969
 970 /*
 971  * check_requirements: check if the required context informations are available
 972  *
 973  * If each mandatory context information is available for at least in one
 974  * event, return 0 otherwise return -1.
 975  */
 976 int check_requirements(struct bt_context *ctx)
 977 {
 978         unsigned int i, evt_cnt, field_cnt;
 979         struct bt_ctf_event_decl *const * evt_list;
 980         const struct bt_ctf_field_decl *const * field_list;
 981         int tid_check = 0;
 982         int pid_check = 0;
 983         int procname_check = 0;
 984         int ppid_check = 0;
 985         int ret = 0;
 986
 987         ret = bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 988         if (ret < 0) {
 989                 goto end;
 990         }
 991
 992         for (i = 0; i < evt_cnt; i++) {
 993                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 994                                 &field_list, &field_cnt);
 995                 ret = check_field_requirements(field_list, field_cnt,
 996                                 &tid_check, &pid_check, &procname_check,
 997                                 &ppid_check);
 998
 999                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
1000                                 &field_list, &field_cnt);
1001                 ret = check_field_requirements(field_list, field_cnt,
1002                                 &tid_check, &pid_check, &procname_check,
1003                                 &ppid_check);
1004
1005                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
1006                                 &field_list, &field_cnt);
1007                 ret = check_field_requirements(field_list, field_cnt,
1008                                 &tid_check, &pid_check, &procname_check,
1009                                 &ppid_check);
1010         }
1011
1012         if (tid_check == 0) {
1013                 ret = -1;
1014                 fprintf(stderr, "[error] missing tid context information\n");
1015         }
1016         if (pid_check == 0) {
1017                 ret = -1;
1018                 fprintf(stderr, "[error] missing pid context information\n");
1019         }
1020         if (ppid_check == 0) {
1021                 ret = -1;
1022                 fprintf(stderr, "[error] missing ppid context information\n");
1023         }
1024         if (procname_check == 0) {
1025                 ret = -1;
1026                 fprintf(stderr, "[error] missing procname context information\n");
1027         }
1028
1029 end:
1030         return ret;
1031 }
1032
1033 int main(int argc, char **argv)
1034 {
1035         int ret;
1036         struct bt_context *bt_ctx = NULL;
1037
1038         init_lttngtop();
1039         ret = parse_options(argc, argv);
1040         if (ret < 0) {
1041                 fprintf(stdout, "Error parsing options.\n\n");
1042                 usage(stdout);
1043                 exit(EXIT_FAILURE);
1044         } else if (ret > 0) {
1045                 exit(EXIT_SUCCESS);
1046         }
1047
1048         if (!opt_input_path && !remote_live) {
1049                 /* mmap live */
1050 #ifdef LTTNGTOP_MMAP_LIVE
1051                 if (opt_textdump) {
1052                         signal(SIGTERM, handle_textdump_sigterm);
1053                         signal(SIGINT, handle_textdump_sigterm);
1054                 }
1055                 mmap_live_loop(bt_ctx);
1056                 pthread_join(timer_thread, NULL);
1057                 quit = 1;
1058                 pthread_join(display_thread, NULL);
1059
1060                 lttng_stop_tracing("test");
1061                 lttng_destroy_session("test");
1062
1063                 goto end;
1064 #else
1065                 fprintf(stderr, "[ERROR] Mmap live support not compiled, specify a "
1066                                 "trace directory or -r <relayd hostname/IP>\n");
1067                 usage(stdout);
1068                 ret = -1;
1069                 goto end;
1070 #endif /* LTTNGTOP_MMAP_LIVE */
1071         } else if (!opt_input_path && remote_live) {
1072                 /* network live */
1073 #if 0
1074                 ret = setup_network_live(opt_relay_hostname, opt_begin);
1075                 if (ret < 0) {
1076                         goto end;
1077                 }
1078
1079                 ret = open_trace(&bt_ctx);
1080                 if (ret < 0) {
1081                         goto end;
1082                 }
1083 #endif
1084
1085                 bt_ctx = bt_context_create();
1086                 ret = bt_context_add_traces_recursive(bt_ctx, opt_relay_hostname,
1087                                 "lttng-live", NULL);
1088                 if (ret < 0) {
1089                         fprintf(stderr, "[error] Opening the trace\n");
1090                         goto end;
1091                 }
1092         } else {
1093                 //init_lttngtop();
1094
1095                 bt_ctx = bt_context_create();
1096                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1097                 if (ret < 0) {
1098                         fprintf(stderr, "[error] Opening the trace\n");
1099                         goto end;
1100                 }
1101
1102                 ret = check_requirements(bt_ctx);
1103                 if (ret < 0) {
1104                         fprintf(stderr, "[error] some mandatory contexts "
1105                                         "were missing, exiting.\n");
1106                         goto end;
1107                 }
1108
1109                 if (!opt_textdump) {
1110                         pthread_create(&display_thread, NULL, ncurses_display,
1111                                         (void *) NULL);
1112                         pthread_create(&timer_thread, NULL, refresh_thread,
1113                                         (void *) NULL);
1114                 }
1115
1116                 iter_trace(bt_ctx);
1117         }
1118
1119
1120         pthread_join(display_thread, NULL);
1121         quit = 1;
1122         pthread_join(timer_thread, NULL);
1123
1124         ret = 0;
1125
1126 end:
1127         if (bt_ctx)
1128                 bt_context_put(bt_ctx);
1129
1130         return ret;
1131 }